fs/ext4/super.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  linux/fs/ext4/super.c
   4  *
   5  * Copyright (C) 1992, 1993, 1994, 1995
   6  * Remy Card (card@masi.ibp.fr)
   7  * Laboratoire MASI - Institut Blaise Pascal
   8  * Universite Pierre et Marie Curie (Paris VI)
   9  *
  10  *  from
  11  *
  12  *  linux/fs/minix/inode.c
  13  *
  14  *  Copyright (C) 1991, 1992  Linus Torvalds
  15  *
  16  *  Big-endian to little-endian byte-swapping/bitmaps by
  17  *        David S. Miller (davem@caip.rutgers.edu), 1995
  18  */
  19
  20 #include <linux/module.h>
  21 #include <linux/string.h>
  22 #include <linux/fs.h>
  23 #include <linux/time.h>
  24 #include <linux/vmalloc.h>
  25 #include <linux/slab.h>
  26 #include <linux/init.h>
  27 #include <linux/blkdev.h>
  28 #include <linux/backing-dev.h>
  29 #include <linux/parser.h>
  30 #include <linux/buffer_head.h>
  31 #include <linux/exportfs.h>
  32 #include <linux/vfs.h>
  33 #include <linux/random.h>
  34 #include <linux/mount.h>
  35 #include <linux/namei.h>
  36 #include <linux/quotaops.h>
  37 #include <linux/seq_file.h>
  38 #include <linux/ctype.h>
  39 #include <linux/log2.h>
  40 #include <linux/crc16.h>
  41 #include <linux/dax.h>
  42 #include <linux/uaccess.h>
  43 #include <linux/iversion.h>
  44 #include <linux/unicode.h>
  45 #include <linux/part_stat.h>
  46 #include <linux/kthread.h>
  47 #include <linux/freezer.h>
  48 #include <linux/fsnotify.h>
  49 #include <linux/fs_context.h>
  50 #include <linux/fs_parser.h>
  51
  52 #include "ext4.h"
  53 #include "ext4_extents.h"       /* Needed for trace points definition */
  54 #include "ext4_jbd2.h"
  55 #include "xattr.h"
  56 #include "acl.h"
  57 #include "mballoc.h"
  58 #include "fsmap.h"
  59
  60 #define CREATE_TRACE_POINTS
  61 #include <trace/events/ext4.h>
  62
  63 static struct ext4_lazy_init *ext4_li_info;
  64 static DEFINE_MUTEX(ext4_li_mtx);
  65 static struct ratelimit_state ext4_mount_msg_ratelimit;
  66
  67 static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
  68                              unsigned long journal_devnum);
  69 static int ext4_show_options(struct seq_file *seq, struct dentry *root);
  70 static void ext4_update_super(struct super_block *sb);
  71 static int ext4_commit_super(struct super_block *sb);
  72 static int ext4_mark_recovery_complete(struct super_block *sb,
  73                                         struct ext4_super_block *es);
  74 static int ext4_clear_journal_err(struct super_block *sb,
  75                                   struct ext4_super_block *es);
  76 static int ext4_sync_fs(struct super_block *sb, int wait);
  77 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
  78 static int ext4_unfreeze(struct super_block *sb);
  79 static int ext4_freeze(struct super_block *sb);
  80 static inline int ext2_feature_set_ok(struct super_block *sb);
  81 static inline int ext3_feature_set_ok(struct super_block *sb);
  82 static void ext4_destroy_lazyinit_thread(void);
  83 static void ext4_unregister_li_request(struct super_block *sb);
  84 static void ext4_clear_request_list(void);
  85 static struct inode *ext4_get_journal_inode(struct super_block *sb,
  86                                             unsigned int journal_inum);
  87 static int ext4_validate_options(struct fs_context *fc);
  88 static int ext4_check_opt_consistency(struct fs_context *fc,
  89                                       struct super_block *sb);
  90 static void ext4_apply_options(struct fs_context *fc, struct super_block *sb);
  91 static int ext4_parse_param(struct fs_context *fc, struct fs_parameter *param);
  92 static int ext4_get_tree(struct fs_context *fc);
  93 static int ext4_reconfigure(struct fs_context *fc);
  94 static void ext4_fc_free(struct fs_context *fc);
  95 static int ext4_init_fs_context(struct fs_context *fc);
  96 static void ext4_kill_sb(struct super_block *sb);
  97 static const struct fs_parameter_spec ext4_param_specs[];
  98
  99 /*
 100  * Lock ordering
 101  *
 102  * page fault path:
 103  * mmap_lock -> sb_start_pagefault -> invalidate_lock (r) -> transaction start
 104  *   -> page lock -> i_data_sem (rw)
 105  *
 106  * buffered write path:
 107  * sb_start_write -> i_mutex -> mmap_lock
 108  * sb_start_write -> i_mutex -> transaction start -> page lock ->
 109  *   i_data_sem (rw)
 110  *
 111  * truncate:
 112  * sb_start_write -> i_mutex -> invalidate_lock (w) -> i_mmap_rwsem (w) ->
 113  *   page lock
 114  * sb_start_write -> i_mutex -> invalidate_lock (w) -> transaction start ->
 115  *   i_data_sem (rw)
 116  *
 117  * direct IO:
 118  * sb_start_write -> i_mutex -> mmap_lock
 119  * sb_start_write -> i_mutex -> transaction start -> i_data_sem (rw)
 120  *
 121  * writepages:
 122  * transaction start -> page lock(s) -> i_data_sem (rw)
 123  */
 124
 125 static const struct fs_context_operations ext4_context_ops = {
 126         .parse_param    = ext4_parse_param,
 127         .get_tree       = ext4_get_tree,
 128         .reconfigure    = ext4_reconfigure,
 129         .free           = ext4_fc_free,
 130 };
 131
 132
 133 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
 134 static struct file_system_type ext2_fs_type = {
 135         .owner                  = THIS_MODULE,
 136         .name                   = "ext2",
 137         .init_fs_context        = ext4_init_fs_context,
 138         .parameters             = ext4_param_specs,
 139         .kill_sb                = ext4_kill_sb,
 140         .fs_flags               = FS_REQUIRES_DEV,
 141 };
 142 MODULE_ALIAS_FS("ext2");
 143 MODULE_ALIAS("ext2");
 144 #define IS_EXT2_SB(sb) ((sb)->s_type == &ext2_fs_type)
 145 #else
 146 #define IS_EXT2_SB(sb) (0)
 147 #endif
 148
 149
 150 static struct file_system_type ext3_fs_type = {
 151         .owner                  = THIS_MODULE,
 152         .name                   = "ext3",
 153         .init_fs_context        = ext4_init_fs_context,
 154         .parameters             = ext4_param_specs,
 155         .kill_sb                = ext4_kill_sb,
 156         .fs_flags               = FS_REQUIRES_DEV,
 157 };
 158 MODULE_ALIAS_FS("ext3");
 159 MODULE_ALIAS("ext3");
 160 #define IS_EXT3_SB(sb) ((sb)->s_type == &ext3_fs_type)
 161
 162
 163 static inline void __ext4_read_bh(struct buffer_head *bh, blk_opf_t op_flags,
 164                                   bh_end_io_t *end_io)
 165 {
 166         /*
 167          * buffer's verified bit is no longer valid after reading from
 168          * disk again due to write out error, clear it to make sure we
 169          * recheck the buffer contents.
 170          */
 171         clear_buffer_verified(bh);
 172
 173         bh->b_end_io = end_io ? end_io : end_buffer_read_sync;
 174         get_bh(bh);
 175         submit_bh(REQ_OP_READ | op_flags, bh);
 176 }
 177
 178 void ext4_read_bh_nowait(struct buffer_head *bh, blk_opf_t op_flags,
 179                          bh_end_io_t *end_io)
 180 {
 181         BUG_ON(!buffer_locked(bh));
 182
 183         if (ext4_buffer_uptodate(bh)) {
 184                 unlock_buffer(bh);
 185                 return;
 186         }
 187         __ext4_read_bh(bh, op_flags, end_io);
 188 }
 189
 190 int ext4_read_bh(struct buffer_head *bh, blk_opf_t op_flags, bh_end_io_t *end_io)
 191 {
 192         BUG_ON(!buffer_locked(bh));
 193
 194         if (ext4_buffer_uptodate(bh)) {
 195                 unlock_buffer(bh);
 196                 return 0;
 197         }
 198
 199         __ext4_read_bh(bh, op_flags, end_io);
 200
 201         wait_on_buffer(bh);
 202         if (buffer_uptodate(bh))
 203                 return 0;
 204         return -EIO;
 205 }
 206
 207 int ext4_read_bh_lock(struct buffer_head *bh, blk_opf_t op_flags, bool wait)
 208 {
 209         lock_buffer(bh);
 210         if (!wait) {
 211                 ext4_read_bh_nowait(bh, op_flags, NULL);
 212                 return 0;
 213         }
 214         return ext4_read_bh(bh, op_flags, NULL);
 215 }
 216
 217 /*
 218  * This works like __bread_gfp() except it uses ERR_PTR for error
 219  * returns.  Currently with sb_bread it's impossible to distinguish
 220  * between ENOMEM and EIO situations (since both result in a NULL
 221  * return.
 222  */
 223 static struct buffer_head *__ext4_sb_bread_gfp(struct super_block *sb,
 224                                                sector_t block,
 225                                                blk_opf_t op_flags, gfp_t gfp)
 226 {
 227         struct buffer_head *bh;
 228         int ret;
 229
 230         bh = sb_getblk_gfp(sb, block, gfp);
 231         if (bh == NULL)
 232                 return ERR_PTR(-ENOMEM);
 233         if (ext4_buffer_uptodate(bh))
 234                 return bh;
 235
 236         ret = ext4_read_bh_lock(bh, REQ_META | op_flags, true);
 237         if (ret) {
 238                 put_bh(bh);
 239                 return ERR_PTR(ret);
 240         }
 241         return bh;
 242 }
 243
 244 struct buffer_head *ext4_sb_bread(struct super_block *sb, sector_t block,
 245                                    blk_opf_t op_flags)
 246 {
 247         return __ext4_sb_bread_gfp(sb, block, op_flags, __GFP_MOVABLE);
 248 }
 249
 250 struct buffer_head *ext4_sb_bread_unmovable(struct super_block *sb,
 251                                             sector_t block)
 252 {
 253         return __ext4_sb_bread_gfp(sb, block, 0, 0);
 254 }
 255
 256 void ext4_sb_breadahead_unmovable(struct super_block *sb, sector_t block)
 257 {
 258         struct buffer_head *bh = sb_getblk_gfp(sb, block, 0);
 259
 260         if (likely(bh)) {
 261                 if (trylock_buffer(bh))
 262                         ext4_read_bh_nowait(bh, REQ_RAHEAD, NULL);
 263                 brelse(bh);
 264         }
 265 }
 266
 267 static int ext4_verify_csum_type(struct super_block *sb,
 268                                  struct ext4_super_block *es)
 269 {
 270         if (!ext4_has_feature_metadata_csum(sb))
 271                 return 1;
 272
 273         return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
 274 }
 275
 276 __le32 ext4_superblock_csum(struct super_block *sb,
 277                             struct ext4_super_block *es)
 278 {
 279         struct ext4_sb_info *sbi = EXT4_SB(sb);
 280         int offset = offsetof(struct ext4_super_block, s_checksum);
 281         __u32 csum;
 282
 283         csum = ext4_chksum(sbi, ~0, (char *)es, offset);
 284
 285         return cpu_to_le32(csum);
 286 }
 287
 288 static int ext4_superblock_csum_verify(struct super_block *sb,
 289                                        struct ext4_super_block *es)
 290 {
 291         if (!ext4_has_metadata_csum(sb))
 292                 return 1;
 293
 294         return es->s_checksum == ext4_superblock_csum(sb, es);
 295 }
 296
 297 void ext4_superblock_csum_set(struct super_block *sb)
 298 {
 299         struct ext4_super_block *es = EXT4_SB(sb)->s_es;
 300
 301         if (!ext4_has_metadata_csum(sb))
 302                 return;
 303
 304         es->s_checksum = ext4_superblock_csum(sb, es);
 305 }
 306
 307 ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
 308                                struct ext4_group_desc *bg)
 309 {
 310         return le32_to_cpu(bg->bg_block_bitmap_lo) |
 311                 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
 312                  (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
 313 }
 314
 315 ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
 316                                struct ext4_group_desc *bg)
 317 {
 318         return le32_to_cpu(bg->bg_inode_bitmap_lo) |
 319                 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
 320                  (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
 321 }
 322
 323 ext4_fsblk_t ext4_inode_table(struct super_block *sb,
 324                               struct ext4_group_desc *bg)
 325 {
 326         return le32_to_cpu(bg->bg_inode_table_lo) |
 327                 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
 328                  (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
 329 }
 330
 331 __u32 ext4_free_group_clusters(struct super_block *sb,
 332                                struct ext4_group_desc *bg)
 333 {
 334         return le16_to_cpu(bg->bg_free_blocks_count_lo) |
 335                 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
 336                  (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
 337 }
 338
 339 __u32 ext4_free_inodes_count(struct super_block *sb,
 340                               struct ext4_group_desc *bg)
 341 {
 342         return le16_to_cpu(bg->bg_free_inodes_count_lo) |
 343                 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
 344                  (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
 345 }
 346
 347 __u32 ext4_used_dirs_count(struct super_block *sb,
 348                               struct ext4_group_desc *bg)
 349 {
 350         return le16_to_cpu(bg->bg_used_dirs_count_lo) |
 351                 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
 352                  (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
 353 }
 354
 355 __u32 ext4_itable_unused_count(struct super_block *sb,
 356                               struct ext4_group_desc *bg)
 357 {
 358         return le16_to_cpu(bg->bg_itable_unused_lo) |
 359                 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
 360                  (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
 361 }
 362
 363 void ext4_block_bitmap_set(struct super_block *sb,
 364                            struct ext4_group_desc *bg, ext4_fsblk_t blk)
 365 {
 366         bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
 367         if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
 368                 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
 369 }
 370
 371 void ext4_inode_bitmap_set(struct super_block *sb,
 372                            struct ext4_group_desc *bg, ext4_fsblk_t blk)
 373 {
 374         bg->bg_inode_bitmap_lo  = cpu_to_le32((u32)blk);
 375         if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
 376                 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
 377 }
 378
 379 void ext4_inode_table_set(struct super_block *sb,
 380                           struct ext4_group_desc *bg, ext4_fsblk_t blk)
 381 {
 382         bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
 383         if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
 384                 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
 385 }
 386
 387 void ext4_free_group_clusters_set(struct super_block *sb,
 388                                   struct ext4_group_desc *bg, __u32 count)
 389 {
 390         bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
 391         if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
 392                 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
 393 }
 394
 395 void ext4_free_inodes_set(struct super_block *sb,
 396                           struct ext4_group_desc *bg, __u32 count)
 397 {
 398         bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
 399         if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
 400                 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
 401 }
 402
 403 void ext4_used_dirs_set(struct super_block *sb,
 404                           struct ext4_group_desc *bg, __u32 count)
 405 {
 406         bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
 407         if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
 408                 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
 409 }
 410
 411 void ext4_itable_unused_set(struct super_block *sb,
 412                           struct ext4_group_desc *bg, __u32 count)
 413 {
 414         bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
 415         if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
 416                 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
 417 }
 418
 419 static void __ext4_update_tstamp(__le32 *lo, __u8 *hi, time64_t now)
 420 {
 421         now = clamp_val(now, 0, (1ull << 40) - 1);
 422
 423         *lo = cpu_to_le32(lower_32_bits(now));
 424         *hi = upper_32_bits(now);
 425 }
 426
 427 static time64_t __ext4_get_tstamp(__le32 *lo, __u8 *hi)
 428 {
 429         return ((time64_t)(*hi) << 32) + le32_to_cpu(*lo);
 430 }
 431 #define ext4_update_tstamp(es, tstamp) \
 432         __ext4_update_tstamp(&(es)->tstamp, &(es)->tstamp ## _hi, \
 433                              ktime_get_real_seconds())
 434 #define ext4_get_tstamp(es, tstamp) \
 435         __ext4_get_tstamp(&(es)->tstamp, &(es)->tstamp ## _hi)
 436
 437 /*
 438  * The del_gendisk() function uninitializes the disk-specific data
 439  * structures, including the bdi structure, without telling anyone
 440  * else.  Once this happens, any attempt to call mark_buffer_dirty()
 441  * (for example, by ext4_commit_super), will cause a kernel OOPS.
 442  * This is a kludge to prevent these oops until we can put in a proper
 443  * hook in del_gendisk() to inform the VFS and file system layers.
 444  */
 445 static int block_device_ejected(struct super_block *sb)
 446 {
 447         struct inode *bd_inode = sb->s_bdev->bd_inode;
 448         struct backing_dev_info *bdi = inode_to_bdi(bd_inode);
 449
 450         return bdi->dev == NULL;
 451 }
 452
 453 static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
 454 {
 455         struct super_block              *sb = journal->j_private;
 456         struct ext4_sb_info             *sbi = EXT4_SB(sb);
 457         int                             error = is_journal_aborted(journal);
 458         struct ext4_journal_cb_entry    *jce;
 459
 460         BUG_ON(txn->t_state == T_FINISHED);
 461
 462         ext4_process_freed_data(sb, txn->t_tid);
 463
 464         spin_lock(&sbi->s_md_lock);
 465         while (!list_empty(&txn->t_private_list)) {
 466                 jce = list_entry(txn->t_private_list.next,
 467                                  struct ext4_journal_cb_entry, jce_list);
 468                 list_del_init(&jce->jce_list);
 469                 spin_unlock(&sbi->s_md_lock);
 470                 jce->jce_func(sb, jce, error);
 471                 spin_lock(&sbi->s_md_lock);
 472         }
 473         spin_unlock(&sbi->s_md_lock);
 474 }
 475
 476 /*
 477  * This writepage callback for write_cache_pages()
 478  * takes care of a few cases after page cleaning.
 479  *
 480  * write_cache_pages() already checks for dirty pages
 481  * and calls clear_page_dirty_for_io(), which we want,
 482  * to write protect the pages.
 483  *
 484  * However, we may have to redirty a page (see below.)
 485  */
 486 static int ext4_journalled_writepage_callback(struct folio *folio,
 487                                               struct writeback_control *wbc,
 488                                               void *data)
 489 {
 490         transaction_t *transaction = (transaction_t *) data;
 491         struct buffer_head *bh, *head;
 492         struct journal_head *jh;
 493
 494         bh = head = folio_buffers(folio);
 495         do {
 496                 /*
 497                  * We have to redirty a page in these cases:
 498                  * 1) If buffer is dirty, it means the page was dirty because it
 499                  * contains a buffer that needs checkpointing. So the dirty bit
 500                  * needs to be preserved so that checkpointing writes the buffer
 501                  * properly.
 502                  * 2) If buffer is not part of the committing transaction
 503                  * (we may have just accidentally come across this buffer because
 504                  * inode range tracking is not exact) or if the currently running
 505                  * transaction already contains this buffer as well, dirty bit
 506                  * needs to be preserved so that the buffer gets writeprotected
 507                  * properly on running transaction's commit.
 508                  */
 509                 jh = bh2jh(bh);
 510                 if (buffer_dirty(bh) ||
 511                     (jh && (jh->b_transaction != transaction ||
 512                             jh->b_next_transaction))) {
 513                         folio_redirty_for_writepage(wbc, folio);
 514                         goto out;
 515                 }
 516         } while ((bh = bh->b_this_page) != head);
 517
 518 out:
 519         return AOP_WRITEPAGE_ACTIVATE;
 520 }
 521
 522 static int ext4_journalled_submit_inode_data_buffers(struct jbd2_inode *jinode)
 523 {
 524         struct address_space *mapping = jinode->i_vfs_inode->i_mapping;
 525         struct writeback_control wbc = {
 526                 .sync_mode =  WB_SYNC_ALL,
 527                 .nr_to_write = LONG_MAX,
 528                 .range_start = jinode->i_dirty_start,
 529                 .range_end = jinode->i_dirty_end,
 530         };
 531
 532         return write_cache_pages(mapping, &wbc,
 533                                  ext4_journalled_writepage_callback,
 534                                  jinode->i_transaction);
 535 }
 536
 537 static int ext4_journal_submit_inode_data_buffers(struct jbd2_inode *jinode)
 538 {
 539         int ret;
 540
 541         if (ext4_should_journal_data(jinode->i_vfs_inode))
 542                 ret = ext4_journalled_submit_inode_data_buffers(jinode);
 543         else
 544                 ret = ext4_normal_submit_inode_data_buffers(jinode);
 545         return ret;
 546 }
 547
 548 static int ext4_journal_finish_inode_data_buffers(struct jbd2_inode *jinode)
 549 {
 550         int ret = 0;
 551
 552         if (!ext4_should_journal_data(jinode->i_vfs_inode))
 553                 ret = jbd2_journal_finish_inode_data_buffers(jinode);
 554
 555         return ret;
 556 }
 557
 558 static bool system_going_down(void)
 559 {
 560         return system_state == SYSTEM_HALT || system_state == SYSTEM_POWER_OFF
 561                 || system_state == SYSTEM_RESTART;
 562 }
 563
 564 struct ext4_err_translation {
 565         int code;
 566         int errno;
 567 };
 568
 569 #define EXT4_ERR_TRANSLATE(err) { .code = EXT4_ERR_##err, .errno = err }
 570
 571 static struct ext4_err_translation err_translation[] = {
 572         EXT4_ERR_TRANSLATE(EIO),
 573         EXT4_ERR_TRANSLATE(ENOMEM),
 574         EXT4_ERR_TRANSLATE(EFSBADCRC),
 575         EXT4_ERR_TRANSLATE(EFSCORRUPTED),
 576         EXT4_ERR_TRANSLATE(ENOSPC),
 577         EXT4_ERR_TRANSLATE(ENOKEY),
 578         EXT4_ERR_TRANSLATE(EROFS),
 579         EXT4_ERR_TRANSLATE(EFBIG),
 580         EXT4_ERR_TRANSLATE(EEXIST),
 581         EXT4_ERR_TRANSLATE(ERANGE),
 582         EXT4_ERR_TRANSLATE(EOVERFLOW),
 583         EXT4_ERR_TRANSLATE(EBUSY),
 584         EXT4_ERR_TRANSLATE(ENOTDIR),
 585         EXT4_ERR_TRANSLATE(ENOTEMPTY),
 586         EXT4_ERR_TRANSLATE(ESHUTDOWN),
 587         EXT4_ERR_TRANSLATE(EFAULT),
 588 };
 589
 590 static int ext4_errno_to_code(int errno)
 591 {
 592         int i;
 593
 594         for (i = 0; i < ARRAY_SIZE(err_translation); i++)
 595                 if (err_translation[i].errno == errno)
 596                         return err_translation[i].code;
 597         return EXT4_ERR_UNKNOWN;
 598 }
 599
 600 static void save_error_info(struct super_block *sb, int error,
 601                             __u32 ino, __u64 block,
 602                             const char *func, unsigned int line)
 603 {
 604         struct ext4_sb_info *sbi = EXT4_SB(sb);
 605
 606         /* We default to EFSCORRUPTED error... */
 607         if (error == 0)
 608                 error = EFSCORRUPTED;
 609
 610         spin_lock(&sbi->s_error_lock);
 611         sbi->s_add_error_count++;
 612         sbi->s_last_error_code = error;
 613         sbi->s_last_error_line = line;
 614         sbi->s_last_error_ino = ino;
 615         sbi->s_last_error_block = block;
 616         sbi->s_last_error_func = func;
 617         sbi->s_last_error_time = ktime_get_real_seconds();
 618         if (!sbi->s_first_error_time) {
 619                 sbi->s_first_error_code = error;
 620                 sbi->s_first_error_line = line;
 621                 sbi->s_first_error_ino = ino;
 622                 sbi->s_first_error_block = block;
 623                 sbi->s_first_error_func = func;
 624                 sbi->s_first_error_time = sbi->s_last_error_time;
 625         }
 626         spin_unlock(&sbi->s_error_lock);
 627 }
 628
 629 /* Deal with the reporting of failure conditions on a filesystem such as
 630  * inconsistencies detected or read IO failures.
 631  *
 632  * On ext2, we can store the error state of the filesystem in the
 633  * superblock.  That is not possible on ext4, because we may have other
 634  * write ordering constraints on the superblock which prevent us from
 635  * writing it out straight away; and given that the journal is about to
 636  * be aborted, we can't rely on the current, or future, transactions to
 637  * write out the superblock safely.
 638  *
 639  * We'll just use the jbd2_journal_abort() error code to record an error in
 640  * the journal instead.  On recovery, the journal will complain about
 641  * that error until we've noted it down and cleared it.
 642  *
 643  * If force_ro is set, we unconditionally force the filesystem into an
 644  * ABORT|READONLY state, unless the error response on the fs has been set to
 645  * panic in which case we take the easy way out and panic immediately. This is
 646  * used to deal with unrecoverable failures such as journal IO errors or ENOMEM
 647  * at a critical moment in log management.
 648  */
 649 static void ext4_handle_error(struct super_block *sb, bool force_ro, int error,
 650                               __u32 ino, __u64 block,
 651                               const char *func, unsigned int line)
 652 {
 653         journal_t *journal = EXT4_SB(sb)->s_journal;
 654         bool continue_fs = !force_ro && test_opt(sb, ERRORS_CONT);
 655
 656         EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
 657         if (test_opt(sb, WARN_ON_ERROR))
 658                 WARN_ON_ONCE(1);
 659
 660         if (!continue_fs && !sb_rdonly(sb)) {
 661                 ext4_set_mount_flag(sb, EXT4_MF_FS_ABORTED);
 662                 if (journal)
 663                         jbd2_journal_abort(journal, -EIO);
 664         }
 665
 666         if (!bdev_read_only(sb->s_bdev)) {
 667                 save_error_info(sb, error, ino, block, func, line);
 668                 /*
 669                  * In case the fs should keep running, we need to writeout
 670                  * superblock through the journal. Due to lock ordering
 671                  * constraints, it may not be safe to do it right here so we
 672                  * defer superblock flushing to a workqueue.
 673                  */
 674                 if (continue_fs && journal)
 675                         schedule_work(&EXT4_SB(sb)->s_error_work);
 676                 else
 677                         ext4_commit_super(sb);
 678         }
 679
 680         /*
 681          * We force ERRORS_RO behavior when system is rebooting. Otherwise we
 682          * could panic during 'reboot -f' as the underlying device got already
 683          * disabled.
 684          */
 685         if (test_opt(sb, ERRORS_PANIC) && !system_going_down()) {
 686                 panic("EXT4-fs (device %s): panic forced after error\n",
 687                         sb->s_id);
 688         }
 689
 690         if (sb_rdonly(sb) || continue_fs)
 691                 return;
 692
 693         ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
 694         /*
 695          * Make sure updated value of ->s_mount_flags will be visible before
 696          * ->s_flags update
 697          */
 698         smp_wmb();
 699         sb->s_flags |= SB_RDONLY;
 700 }
 701
 702 static void flush_stashed_error_work(struct work_struct *work)
 703 {
 704         struct ext4_sb_info *sbi = container_of(work, struct ext4_sb_info,
 705                                                 s_error_work);
 706         journal_t *journal = sbi->s_journal;
 707         handle_t *handle;
 708
 709         /*
 710          * If the journal is still running, we have to write out superblock
 711          * through the journal to avoid collisions of other journalled sb
 712          * updates.
 713          *
 714          * We use directly jbd2 functions here to avoid recursing back into
 715          * ext4 error handling code during handling of previous errors.
 716          */
 717         if (!sb_rdonly(sbi->s_sb) && journal) {
 718                 struct buffer_head *sbh = sbi->s_sbh;
 719                 handle = jbd2_journal_start(journal, 1);
 720                 if (IS_ERR(handle))
 721                         goto write_directly;
 722                 if (jbd2_journal_get_write_access(handle, sbh)) {
 723                         jbd2_journal_stop(handle);
 724                         goto write_directly;
 725                 }
 726                 ext4_update_super(sbi->s_sb);
 727                 if (buffer_write_io_error(sbh) || !buffer_uptodate(sbh)) {
 728                         ext4_msg(sbi->s_sb, KERN_ERR, "previous I/O error to "
 729                                  "superblock detected");
 730                         clear_buffer_write_io_error(sbh);
 731                         set_buffer_uptodate(sbh);
 732                 }
 733
 734                 if (jbd2_journal_dirty_metadata(handle, sbh)) {
 735                         jbd2_journal_stop(handle);
 736                         goto write_directly;
 737                 }
 738                 jbd2_journal_stop(handle);
 739                 ext4_notify_error_sysfs(sbi);
 740                 return;
 741         }
 742 write_directly:
 743         /*
 744          * Write through journal failed. Write sb directly to get error info
 745          * out and hope for the best.
 746          */
 747         ext4_commit_super(sbi->s_sb);
 748         ext4_notify_error_sysfs(sbi);
 749 }
 750
 751 #define ext4_error_ratelimit(sb)                                        \
 752                 ___ratelimit(&(EXT4_SB(sb)->s_err_ratelimit_state),     \
 753                              "EXT4-fs error")
 754
 755 void __ext4_error(struct super_block *sb, const char *function,
 756                   unsigned int line, bool force_ro, int error, __u64 block,
 757                   const char *fmt, ...)
 758 {
 759         struct va_format vaf;
 760         va_list args;
 761
 762         if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
 763                 return;
 764
 765         trace_ext4_error(sb, function, line);
 766         if (ext4_error_ratelimit(sb)) {
 767                 va_start(args, fmt);
 768                 vaf.fmt = fmt;
 769                 vaf.va = &args;
 770                 printk(KERN_CRIT
 771                        "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
 772                        sb->s_id, function, line, current->comm, &vaf);
 773                 va_end(args);
 774         }
 775         fsnotify_sb_error(sb, NULL, error ? error : EFSCORRUPTED);
 776
 777         ext4_handle_error(sb, force_ro, error, 0, block, function, line);
 778 }
 779
 780 void __ext4_error_inode(struct inode *inode, const char *function,
 781                         unsigned int line, ext4_fsblk_t block, int error,
 782                         const char *fmt, ...)
 783 {
 784         va_list args;
 785         struct va_format vaf;
 786
 787         if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
 788                 return;
 789
 790         trace_ext4_error(inode->i_sb, function, line);
 791         if (ext4_error_ratelimit(inode->i_sb)) {
 792                 va_start(args, fmt);
 793                 vaf.fmt = fmt;
 794                 vaf.va = &args;
 795                 if (block)
 796                         printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
 797                                "inode #%lu: block %llu: comm %s: %pV\n",
 798                                inode->i_sb->s_id, function, line, inode->i_ino,
 799                                block, current->comm, &vaf);
 800                 else
 801                         printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
 802                                "inode #%lu: comm %s: %pV\n",
 803                                inode->i_sb->s_id, function, line, inode->i_ino,
 804                                current->comm, &vaf);
 805                 va_end(args);
 806         }
 807         fsnotify_sb_error(inode->i_sb, inode, error ? error : EFSCORRUPTED);
 808
 809         ext4_handle_error(inode->i_sb, false, error, inode->i_ino, block,
 810                           function, line);
 811 }
 812
 813 void __ext4_error_file(struct file *file, const char *function,
 814                        unsigned int line, ext4_fsblk_t block,
 815                        const char *fmt, ...)
 816 {
 817         va_list args;
 818         struct va_format vaf;
 819         struct inode *inode = file_inode(file);
 820         char pathname[80], *path;
 821
 822         if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
 823                 return;
 824
 825         trace_ext4_error(inode->i_sb, function, line);
 826         if (ext4_error_ratelimit(inode->i_sb)) {
 827                 path = file_path(file, pathname, sizeof(pathname));
 828                 if (IS_ERR(path))
 829                         path = "(unknown)";
 830                 va_start(args, fmt);
 831                 vaf.fmt = fmt;
 832                 vaf.va = &args;
 833                 if (block)
 834                         printk(KERN_CRIT
 835                                "EXT4-fs error (device %s): %s:%d: inode #%lu: "
 836                                "block %llu: comm %s: path %s: %pV\n",
 837                                inode->i_sb->s_id, function, line, inode->i_ino,
 838                                block, current->comm, path, &vaf);
 839                 else
 840                         printk(KERN_CRIT
 841                                "EXT4-fs error (device %s): %s:%d: inode #%lu: "
 842                                "comm %s: path %s: %pV\n",
 843                                inode->i_sb->s_id, function, line, inode->i_ino,
 844                                current->comm, path, &vaf);
 845                 va_end(args);
 846         }
 847         fsnotify_sb_error(inode->i_sb, inode, EFSCORRUPTED);
 848
 849         ext4_handle_error(inode->i_sb, false, EFSCORRUPTED, inode->i_ino, block,
 850                           function, line);
 851 }
 852
 853 const char *ext4_decode_error(struct super_block *sb, int errno,
 854                               char nbuf[16])
 855 {
 856         char *errstr = NULL;
 857
 858         switch (errno) {
 859         case -EFSCORRUPTED:
 860                 errstr = "Corrupt filesystem";
 861                 break;
 862         case -EFSBADCRC:
 863                 errstr = "Filesystem failed CRC";
 864                 break;
 865         case -EIO:
 866                 errstr = "IO failure";
 867                 break;
 868         case -ENOMEM:
 869                 errstr = "Out of memory";
 870                 break;
 871         case -EROFS:
 872                 if (!sb || (EXT4_SB(sb)->s_journal &&
 873                             EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
 874                         errstr = "Journal has aborted";
 875                 else
 876                         errstr = "Readonly filesystem";
 877                 break;
 878         default:
 879                 /* If the caller passed in an extra buffer for unknown
 880                  * errors, textualise them now.  Else we just return
 881                  * NULL. */
 882                 if (nbuf) {
 883                         /* Check for truncated error codes... */
 884                         if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
 885                                 errstr = nbuf;
 886                 }
 887                 break;
 888         }
 889
 890         return errstr;
 891 }
 892
 893 /* __ext4_std_error decodes expected errors from journaling functions
 894  * automatically and invokes the appropriate error response.  */
 895
 896 void __ext4_std_error(struct super_block *sb, const char *function,
 897                       unsigned int line, int errno)
 898 {
 899         char nbuf[16];
 900         const char *errstr;
 901
 902         if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
 903                 return;
 904
 905         /* Special case: if the error is EROFS, and we're not already
 906          * inside a transaction, then there's really no point in logging
 907          * an error. */
 908         if (errno == -EROFS && journal_current_handle() == NULL && sb_rdonly(sb))
 909                 return;
 910
 911         if (ext4_error_ratelimit(sb)) {
 912                 errstr = ext4_decode_error(sb, errno, nbuf);
 913                 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
 914                        sb->s_id, function, line, errstr);
 915         }
 916         fsnotify_sb_error(sb, NULL, errno ? errno : EFSCORRUPTED);
 917
 918         ext4_handle_error(sb, false, -errno, 0, 0, function, line);
 919 }
 920
 921 void __ext4_msg(struct super_block *sb,
 922                 const char *prefix, const char *fmt, ...)
 923 {
 924         struct va_format vaf;
 925         va_list args;
 926
 927         if (sb) {
 928                 atomic_inc(&EXT4_SB(sb)->s_msg_count);
 929                 if (!___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state),
 930                                   "EXT4-fs"))
 931                         return;
 932         }
 933
 934         va_start(args, fmt);
 935         vaf.fmt = fmt;
 936         vaf.va = &args;
 937         if (sb)
 938                 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
 939         else
 940                 printk("%sEXT4-fs: %pV\n", prefix, &vaf);
 941         va_end(args);
 942 }
 943
 944 static int ext4_warning_ratelimit(struct super_block *sb)
 945 {
 946         atomic_inc(&EXT4_SB(sb)->s_warning_count);
 947         return ___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state),
 948                             "EXT4-fs warning");
 949 }
 950
 951 void __ext4_warning(struct super_block *sb, const char *function,
 952                     unsigned int line, const char *fmt, ...)
 953 {
 954         struct va_format vaf;
 955         va_list args;
 956
 957         if (!ext4_warning_ratelimit(sb))
 958                 return;
 959
 960         va_start(args, fmt);
 961         vaf.fmt = fmt;
 962         vaf.va = &args;
 963         printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
 964                sb->s_id, function, line, &vaf);
 965         va_end(args);
 966 }
 967
 968 void __ext4_warning_inode(const struct inode *inode, const char *function,
 969                           unsigned int line, const char *fmt, ...)
 970 {
 971         struct va_format vaf;
 972         va_list args;
 973
 974         if (!ext4_warning_ratelimit(inode->i_sb))
 975                 return;
 976
 977         va_start(args, fmt);
 978         vaf.fmt = fmt;
 979         vaf.va = &args;
 980         printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: "
 981                "inode #%lu: comm %s: %pV\n", inode->i_sb->s_id,
 982                function, line, inode->i_ino, current->comm, &vaf);
 983         va_end(args);
 984 }
 985
 986 void __ext4_grp_locked_error(const char *function, unsigned int line,
 987                              struct super_block *sb, ext4_group_t grp,
 988                              unsigned long ino, ext4_fsblk_t block,
 989                              const char *fmt, ...)
 990 __releases(bitlock)
 991 __acquires(bitlock)
 992 {
 993         struct va_format vaf;
 994         va_list args;
 995
 996         if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
 997                 return;
 998
 999         trace_ext4_error(sb, function, line);
1000         if (ext4_error_ratelimit(sb)) {
1001                 va_start(args, fmt);
1002                 vaf.fmt = fmt;
1003                 vaf.va = &args;
1004                 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
1005                        sb->s_id, function, line, grp);
1006                 if (ino)
1007                         printk(KERN_CONT "inode %lu: ", ino);
1008                 if (block)
1009                         printk(KERN_CONT "block %llu:",
1010                                (unsigned long long) block);
1011                 printk(KERN_CONT "%pV\n", &vaf);
1012                 va_end(args);
1013         }
1014
1015         if (test_opt(sb, ERRORS_CONT)) {
1016                 if (test_opt(sb, WARN_ON_ERROR))
1017                         WARN_ON_ONCE(1);
1018                 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
1019                 if (!bdev_read_only(sb->s_bdev)) {
1020                         save_error_info(sb, EFSCORRUPTED, ino, block, function,
1021                                         line);
1022                         schedule_work(&EXT4_SB(sb)->s_error_work);
1023                 }
1024                 return;
1025         }
1026         ext4_unlock_group(sb, grp);
1027         ext4_handle_error(sb, false, EFSCORRUPTED, ino, block, function, line);
1028         /*
1029          * We only get here in the ERRORS_RO case; relocking the group
1030          * may be dangerous, but nothing bad will happen since the
1031          * filesystem will have already been marked read/only and the
1032          * journal has been aborted.  We return 1 as a hint to callers
1033          * who might what to use the return value from
1034          * ext4_grp_locked_error() to distinguish between the
1035          * ERRORS_CONT and ERRORS_RO case, and perhaps return more
1036          * aggressively from the ext4 function in question, with a
1037          * more appropriate error code.
1038          */
1039         ext4_lock_group(sb, grp);
1040         return;
1041 }
1042
1043 void ext4_mark_group_bitmap_corrupted(struct super_block *sb,
1044                                      ext4_group_t group,
1045                                      unsigned int flags)
1046 {
1047         struct ext4_sb_info *sbi = EXT4_SB(sb);
1048         struct ext4_group_info *grp = ext4_get_group_info(sb, group);
1049         struct ext4_group_desc *gdp = ext4_get_group_desc(sb, group, NULL);
1050         int ret;
1051
1052         if (!grp || !gdp)
1053                 return;
1054         if (flags & EXT4_GROUP_INFO_BBITMAP_CORRUPT) {
1055                 ret = ext4_test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT,
1056                                             &grp->bb_state);
1057                 if (!ret)
1058                         percpu_counter_sub(&sbi->s_freeclusters_counter,
1059                                            grp->bb_free);
1060         }
1061
1062         if (flags & EXT4_GROUP_INFO_IBITMAP_CORRUPT) {
1063                 ret = ext4_test_and_set_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT,
1064                                             &grp->bb_state);
1065                 if (!ret && gdp) {
1066                         int count;
1067
1068                         count = ext4_free_inodes_count(sb, gdp);
1069                         percpu_counter_sub(&sbi->s_freeinodes_counter,
1070                                            count);
1071                 }
1072         }
1073 }
1074
1075 void ext4_update_dynamic_rev(struct super_block *sb)
1076 {
1077         struct ext4_super_block *es = EXT4_SB(sb)->s_es;
1078
1079         if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
1080                 return;
1081
1082         ext4_warning(sb,
1083                      "updating to rev %d because of new feature flag, "
1084                      "running e2fsck is recommended",
1085                      EXT4_DYNAMIC_REV);
1086
1087         es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
1088         es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
1089         es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
1090         /* leave es->s_feature_*compat flags alone */
1091         /* es->s_uuid will be set by e2fsck if empty */
1092
1093         /*
1094          * The rest of the superblock fields should be zero, and if not it
1095          * means they are likely already in use, so leave them alone.  We
1096          * can leave it up to e2fsck to clean up any inconsistencies there.
1097          */
1098 }
1099
1100 static void ext4_bdev_mark_dead(struct block_device *bdev)
1101 {
1102         ext4_force_shutdown(bdev->bd_holder, EXT4_GOING_FLAGS_NOLOGFLUSH);
1103 }
1104
1105 static const struct blk_holder_ops ext4_holder_ops = {
1106         .mark_dead              = ext4_bdev_mark_dead,
1107 };
1108
1109 /*
1110  * Open the external journal device
1111  */
1112 static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
1113 {
1114         struct block_device *bdev;
1115
1116         bdev = blkdev_get_by_dev(dev, BLK_OPEN_READ | BLK_OPEN_WRITE, sb,
1117                                  &ext4_holder_ops);
1118         if (IS_ERR(bdev))
1119                 goto fail;
1120         return bdev;
1121
1122 fail:
1123         ext4_msg(sb, KERN_ERR,
1124                  "failed to open journal device unknown-block(%u,%u) %ld",
1125                  MAJOR(dev), MINOR(dev), PTR_ERR(bdev));
1126         return NULL;
1127 }
1128
1129 static inline struct inode *orphan_list_entry(struct list_head *l)
1130 {
1131         return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
1132 }
1133
1134 static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
1135 {
1136         struct list_head *l;
1137
1138         ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
1139                  le32_to_cpu(sbi->s_es->s_last_orphan));
1140
1141         printk(KERN_ERR "sb_info orphan list:\n");
1142         list_for_each(l, &sbi->s_orphan) {
1143                 struct inode *inode = orphan_list_entry(l);
1144                 printk(KERN_ERR "  "
1145                        "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
1146                        inode->i_sb->s_id, inode->i_ino, inode,
1147                        inode->i_mode, inode->i_nlink,
1148                        NEXT_ORPHAN(inode));
1149         }
1150 }
1151
1152 #ifdef CONFIG_QUOTA
1153 static int ext4_quota_off(struct super_block *sb, int type);
1154
1155 static inline void ext4_quotas_off(struct super_block *sb, int type)
1156 {
1157         BUG_ON(type > EXT4_MAXQUOTAS);
1158
1159         /* Use our quota_off function to clear inode flags etc. */
1160         for (type--; type >= 0; type--)
1161                 ext4_quota_off(sb, type);
1162 }
1163
1164 /*
1165  * This is a helper function which is used in the mount/remount
1166  * codepaths (which holds s_umount) to fetch the quota file name.
1167  */
1168 static inline char *get_qf_name(struct super_block *sb,
1169                                 struct ext4_sb_info *sbi,
1170                                 int type)
1171 {
1172         return rcu_dereference_protected(sbi->s_qf_names[type],
1173                                          lockdep_is_held(&sb->s_umount));
1174 }
1175 #else
1176 static inline void ext4_quotas_off(struct super_block *sb, int type)
1177 {
1178 }
1179 #endif
1180
1181 static int ext4_percpu_param_init(struct ext4_sb_info *sbi)
1182 {
1183         ext4_fsblk_t block;
1184         int err;
1185
1186         block = ext4_count_free_clusters(sbi->s_sb);
1187         ext4_free_blocks_count_set(sbi->s_es, EXT4_C2B(sbi, block));
1188         err = percpu_counter_init(&sbi->s_freeclusters_counter, block,
1189                                   GFP_KERNEL);
1190         if (!err) {
1191                 unsigned long freei = ext4_count_free_inodes(sbi->s_sb);
1192                 sbi->s_es->s_free_inodes_count = cpu_to_le32(freei);
1193                 err = percpu_counter_init(&sbi->s_freeinodes_counter, freei,
1194                                           GFP_KERNEL);
1195         }
1196         if (!err)
1197                 err = percpu_counter_init(&sbi->s_dirs_counter,
1198                                           ext4_count_dirs(sbi->s_sb), GFP_KERNEL);
1199         if (!err)
1200                 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0,
1201                                           GFP_KERNEL);
1202         if (!err)
1203                 err = percpu_counter_init(&sbi->s_sra_exceeded_retry_limit, 0,
1204                                           GFP_KERNEL);
1205         if (!err)
1206                 err = percpu_init_rwsem(&sbi->s_writepages_rwsem);
1207
1208         if (err)
1209                 ext4_msg(sbi->s_sb, KERN_ERR, "insufficient memory");
1210
1211         return err;
1212 }
1213
1214 static void ext4_percpu_param_destroy(struct ext4_sb_info *sbi)
1215 {
1216         percpu_counter_destroy(&sbi->s_freeclusters_counter);
1217         percpu_counter_destroy(&sbi->s_freeinodes_counter);
1218         percpu_counter_destroy(&sbi->s_dirs_counter);
1219         percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
1220         percpu_counter_destroy(&sbi->s_sra_exceeded_retry_limit);
1221         percpu_free_rwsem(&sbi->s_writepages_rwsem);
1222 }
1223
1224 static void ext4_group_desc_free(struct ext4_sb_info *sbi)
1225 {
1226         struct buffer_head **group_desc;
1227         int i;
1228
1229         rcu_read_lock();
1230         group_desc = rcu_dereference(sbi->s_group_desc);
1231         for (i = 0; i < sbi->s_gdb_count; i++)
1232                 brelse(group_desc[i]);
1233         kvfree(group_desc);
1234         rcu_read_unlock();
1235 }
1236
1237 static void ext4_flex_groups_free(struct ext4_sb_info *sbi)
1238 {
1239         struct flex_groups **flex_groups;
1240         int i;
1241
1242         rcu_read_lock();
1243         flex_groups = rcu_dereference(sbi->s_flex_groups);
1244         if (flex_groups) {
1245                 for (i = 0; i < sbi->s_flex_groups_allocated; i++)
1246                         kvfree(flex_groups[i]);
1247                 kvfree(flex_groups);
1248         }
1249         rcu_read_unlock();
1250 }
1251
1252 static void ext4_put_super(struct super_block *sb)
1253 {
1254         struct ext4_sb_info *sbi = EXT4_SB(sb);
1255         struct ext4_super_block *es = sbi->s_es;
1256         int aborted = 0;
1257         int err;
1258
1259         /*
1260          * Unregister sysfs before destroying jbd2 journal.
1261          * Since we could still access attr_journal_task attribute via sysfs
1262          * path which could have sbi->s_journal->j_task as NULL
1263          * Unregister sysfs before flush sbi->s_error_work.
1264          * Since user may read /proc/fs/ext4/xx/mb_groups during umount, If
1265          * read metadata verify failed then will queue error work.
1266          * flush_stashed_error_work will call start_this_handle may trigger
1267          * BUG_ON.
1268          */
1269         ext4_unregister_sysfs(sb);
1270
1271         if (___ratelimit(&ext4_mount_msg_ratelimit, "EXT4-fs unmount"))
1272                 ext4_msg(sb, KERN_INFO, "unmounting filesystem %pU.",
1273                          &sb->s_uuid);
1274
1275         ext4_unregister_li_request(sb);
1276         ext4_quotas_off(sb, EXT4_MAXQUOTAS);
1277
1278         flush_work(&sbi->s_error_work);
1279         destroy_workqueue(sbi->rsv_conversion_wq);
1280         ext4_release_orphan_info(sb);
1281
1282         if (sbi->s_journal) {
1283                 aborted = is_journal_aborted(sbi->s_journal);
1284                 err = jbd2_journal_destroy(sbi->s_journal);
1285                 sbi->s_journal = NULL;
1286                 if ((err < 0) && !aborted) {
1287                         ext4_abort(sb, -err, "Couldn't clean up the journal");
1288                 }
1289         }
1290
1291         ext4_es_unregister_shrinker(sbi);
1292         timer_shutdown_sync(&sbi->s_err_report);
1293         ext4_release_system_zone(sb);
1294         ext4_mb_release(sb);
1295         ext4_ext_release(sb);
1296
1297         if (!sb_rdonly(sb) && !aborted) {
1298                 ext4_clear_feature_journal_needs_recovery(sb);
1299                 ext4_clear_feature_orphan_present(sb);
1300                 es->s_state = cpu_to_le16(sbi->s_mount_state);
1301         }
1302         if (!sb_rdonly(sb))
1303                 ext4_commit_super(sb);
1304
1305         ext4_group_desc_free(sbi);
1306         ext4_flex_groups_free(sbi);
1307         ext4_percpu_param_destroy(sbi);
1308 #ifdef CONFIG_QUOTA
1309         for (int i = 0; i < EXT4_MAXQUOTAS; i++)
1310                 kfree(get_qf_name(sb, sbi, i));
1311 #endif
1312
1313         /* Debugging code just in case the in-memory inode orphan list
1314          * isn't empty.  The on-disk one can be non-empty if we've
1315          * detected an error and taken the fs readonly, but the
1316          * in-memory list had better be clean by this point. */
1317         if (!list_empty(&sbi->s_orphan))
1318                 dump_orphan_list(sb, sbi);
1319         ASSERT(list_empty(&sbi->s_orphan));
1320
1321         sync_blockdev(sb->s_bdev);
1322         invalidate_bdev(sb->s_bdev);
1323         if (sbi->s_journal_bdev) {
1324                 /*
1325                  * Invalidate the journal device's buffers.  We don't want them
1326                  * floating about in memory - the physical journal device may
1327                  * hotswapped, and it breaks the `ro-after' testing code.
1328                  */
1329                 sync_blockdev(sbi->s_journal_bdev);
1330                 invalidate_bdev(sbi->s_journal_bdev);
1331         }
1332
1333         ext4_xattr_destroy_cache(sbi->s_ea_inode_cache);
1334         sbi->s_ea_inode_cache = NULL;
1335
1336         ext4_xattr_destroy_cache(sbi->s_ea_block_cache);
1337         sbi->s_ea_block_cache = NULL;
1338
1339         ext4_stop_mmpd(sbi);
1340
1341         brelse(sbi->s_sbh);
1342         sb->s_fs_info = NULL;
1343         /*
1344          * Now that we are completely done shutting down the
1345          * superblock, we need to actually destroy the kobject.
1346          */
1347         kobject_put(&sbi->s_kobj);
1348         wait_for_completion(&sbi->s_kobj_unregister);
1349         if (sbi->s_chksum_driver)
1350                 crypto_free_shash(sbi->s_chksum_driver);
1351         kfree(sbi->s_blockgroup_lock);
1352         fs_put_dax(sbi->s_daxdev, NULL);
1353         fscrypt_free_dummy_policy(&sbi->s_dummy_enc_policy);
1354 #if IS_ENABLED(CONFIG_UNICODE)
1355         utf8_unload(sb->s_encoding);
1356 #endif
1357         kfree(sbi);
1358 }
1359
1360 static struct kmem_cache *ext4_inode_cachep;
1361
1362 /*
1363  * Called inside transaction, so use GFP_NOFS
1364  */
1365 static struct inode *ext4_alloc_inode(struct super_block *sb)
1366 {
1367         struct ext4_inode_info *ei;
1368
1369         ei = alloc_inode_sb(sb, ext4_inode_cachep, GFP_NOFS);
1370         if (!ei)
1371                 return NULL;
1372
1373         inode_set_iversion(&ei->vfs_inode, 1);
1374         ei->i_flags = 0;
1375         spin_lock_init(&ei->i_raw_lock);
1376         ei->i_prealloc_node = RB_ROOT;
1377         atomic_set(&ei->i_prealloc_active, 0);
1378         rwlock_init(&ei->i_prealloc_lock);
1379         ext4_es_init_tree(&ei->i_es_tree);
1380         rwlock_init(&ei->i_es_lock);
1381         INIT_LIST_HEAD(&ei->i_es_list);
1382         ei->i_es_all_nr = 0;
1383         ei->i_es_shk_nr = 0;
1384         ei->i_es_shrink_lblk = 0;
1385         ei->i_reserved_data_blocks = 0;
1386         spin_lock_init(&(ei->i_block_reservation_lock));
1387         ext4_init_pending_tree(&ei->i_pending_tree);
1388 #ifdef CONFIG_QUOTA
1389         ei->i_reserved_quota = 0;
1390         memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
1391 #endif
1392         ei->jinode = NULL;
1393         INIT_LIST_HEAD(&ei->i_rsv_conversion_list);
1394         spin_lock_init(&ei->i_completed_io_lock);
1395         ei->i_sync_tid = 0;
1396         ei->i_datasync_tid = 0;
1397         atomic_set(&ei->i_unwritten, 0);
1398         INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work);
1399         ext4_fc_init_inode(&ei->vfs_inode);
1400         mutex_init(&ei->i_fc_lock);
1401         return &ei->vfs_inode;
1402 }
1403
1404 static int ext4_drop_inode(struct inode *inode)
1405 {
1406         int drop = generic_drop_inode(inode);
1407
1408         if (!drop)
1409                 drop = fscrypt_drop_inode(inode);
1410
1411         trace_ext4_drop_inode(inode, drop);
1412         return drop;
1413 }
1414
1415 static void ext4_free_in_core_inode(struct inode *inode)
1416 {
1417         fscrypt_free_inode(inode);
1418         if (!list_empty(&(EXT4_I(inode)->i_fc_list))) {
1419                 pr_warn("%s: inode %ld still in fc list",
1420                         __func__, inode->i_ino);
1421         }
1422         kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
1423 }
1424
1425 static void ext4_destroy_inode(struct inode *inode)
1426 {
1427         if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
1428                 ext4_msg(inode->i_sb, KERN_ERR,
1429                          "Inode %lu (%p): orphan list check failed!",
1430                          inode->i_ino, EXT4_I(inode));
1431                 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
1432                                 EXT4_I(inode), sizeof(struct ext4_inode_info),
1433                                 true);
1434                 dump_stack();
1435         }
1436
1437         if (EXT4_I(inode)->i_reserved_data_blocks)
1438                 ext4_msg(inode->i_sb, KERN_ERR,
1439                          "Inode %lu (%p): i_reserved_data_blocks (%u) not cleared!",
1440                          inode->i_ino, EXT4_I(inode),
1441                          EXT4_I(inode)->i_reserved_data_blocks);
1442 }
1443
1444 static void ext4_shutdown(struct super_block *sb)
1445 {
1446        ext4_force_shutdown(sb, EXT4_GOING_FLAGS_NOLOGFLUSH);
1447 }
1448
1449 static void init_once(void *foo)
1450 {
1451         struct ext4_inode_info *ei = foo;
1452
1453         INIT_LIST_HEAD(&ei->i_orphan);
1454         init_rwsem(&ei->xattr_sem);
1455         init_rwsem(&ei->i_data_sem);
1456         inode_init_once(&ei->vfs_inode);
1457         ext4_fc_init_inode(&ei->vfs_inode);
1458 }
1459
1460 static int __init init_inodecache(void)
1461 {
1462         ext4_inode_cachep = kmem_cache_create_usercopy("ext4_inode_cache",
1463                                 sizeof(struct ext4_inode_info), 0,
1464                                 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
1465                                         SLAB_ACCOUNT),
1466                                 offsetof(struct ext4_inode_info, i_data),
1467                                 sizeof_field(struct ext4_inode_info, i_data),
1468                                 init_once);
1469         if (ext4_inode_cachep == NULL)
1470                 return -ENOMEM;
1471         return 0;
1472 }
1473
1474 static void destroy_inodecache(void)
1475 {
1476         /*
1477          * Make sure all delayed rcu free inodes are flushed before we
1478          * destroy cache.
1479          */
1480         rcu_barrier();
1481         kmem_cache_destroy(ext4_inode_cachep);
1482 }
1483
1484 void ext4_clear_inode(struct inode *inode)
1485 {
1486         ext4_fc_del(inode);
1487         invalidate_inode_buffers(inode);
1488         clear_inode(inode);
1489         ext4_discard_preallocations(inode, 0);
1490         ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
1491         dquot_drop(inode);
1492         if (EXT4_I(inode)->jinode) {
1493                 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
1494                                                EXT4_I(inode)->jinode);
1495                 jbd2_free_inode(EXT4_I(inode)->jinode);
1496                 EXT4_I(inode)->jinode = NULL;
1497         }
1498         fscrypt_put_encryption_info(inode);
1499         fsverity_cleanup_inode(inode);
1500 }
1501
1502 static struct inode *ext4_nfs_get_inode(struct super_block *sb,
1503                                         u64 ino, u32 generation)
1504 {
1505         struct inode *inode;
1506
1507         /*
1508          * Currently we don't know the generation for parent directory, so
1509          * a generation of 0 means "accept any"
1510          */
1511         inode = ext4_iget(sb, ino, EXT4_IGET_HANDLE);
1512         if (IS_ERR(inode))
1513                 return ERR_CAST(inode);
1514         if (generation && inode->i_generation != generation) {
1515                 iput(inode);
1516                 return ERR_PTR(-ESTALE);
1517         }
1518
1519         return inode;
1520 }
1521
1522 static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
1523                                         int fh_len, int fh_type)
1524 {
1525         return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1526                                     ext4_nfs_get_inode);
1527 }
1528
1529 static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
1530                                         int fh_len, int fh_type)
1531 {
1532         return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1533                                     ext4_nfs_get_inode);
1534 }
1535
1536 static int ext4_nfs_commit_metadata(struct inode *inode)
1537 {
1538         struct writeback_control wbc = {
1539                 .sync_mode = WB_SYNC_ALL
1540         };
1541
1542         trace_ext4_nfs_commit_metadata(inode);
1543         return ext4_write_inode(inode, &wbc);
1544 }
1545
1546 #ifdef CONFIG_QUOTA
1547 static const char * const quotatypes[] = INITQFNAMES;
1548 #define QTYPE2NAME(t) (quotatypes[t])
1549
1550 static int ext4_write_dquot(struct dquot *dquot);
1551 static int ext4_acquire_dquot(struct dquot *dquot);
1552 static int ext4_release_dquot(struct dquot *dquot);
1553 static int ext4_mark_dquot_dirty(struct dquot *dquot);
1554 static int ext4_write_info(struct super_block *sb, int type);
1555 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
1556                          const struct path *path);
1557 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
1558                                size_t len, loff_t off);
1559 static ssize_t ext4_quota_write(struct super_block *sb, int type,
1560                                 const char *data, size_t len, loff_t off);
1561 static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
1562                              unsigned int flags);
1563
1564 static struct dquot **ext4_get_dquots(struct inode *inode)
1565 {
1566         return EXT4_I(inode)->i_dquot;
1567 }
1568
1569 static const struct dquot_operations ext4_quota_operations = {
1570         .get_reserved_space     = ext4_get_reserved_space,
1571         .write_dquot            = ext4_write_dquot,
1572         .acquire_dquot          = ext4_acquire_dquot,
1573         .release_dquot          = ext4_release_dquot,
1574         .mark_dirty             = ext4_mark_dquot_dirty,
1575         .write_info             = ext4_write_info,
1576         .alloc_dquot            = dquot_alloc,
1577         .destroy_dquot          = dquot_destroy,
1578         .get_projid             = ext4_get_projid,
1579         .get_inode_usage        = ext4_get_inode_usage,
1580         .get_next_id            = dquot_get_next_id,
1581 };
1582
1583 static const struct quotactl_ops ext4_qctl_operations = {
1584         .quota_on       = ext4_quota_on,
1585         .quota_off      = ext4_quota_off,
1586         .quota_sync     = dquot_quota_sync,
1587         .get_state      = dquot_get_state,
1588         .set_info       = dquot_set_dqinfo,
1589         .get_dqblk      = dquot_get_dqblk,
1590         .set_dqblk      = dquot_set_dqblk,
1591         .get_nextdqblk  = dquot_get_next_dqblk,
1592 };
1593 #endif
1594
1595 static const struct super_operations ext4_sops = {
1596         .alloc_inode    = ext4_alloc_inode,
1597         .free_inode     = ext4_free_in_core_inode,
1598         .destroy_inode  = ext4_destroy_inode,
1599         .write_inode    = ext4_write_inode,
1600         .dirty_inode    = ext4_dirty_inode,
1601         .drop_inode     = ext4_drop_inode,
1602         .evict_inode    = ext4_evict_inode,
1603         .put_super      = ext4_put_super,
1604         .sync_fs        = ext4_sync_fs,
1605         .freeze_fs      = ext4_freeze,
1606         .unfreeze_fs    = ext4_unfreeze,
1607         .statfs         = ext4_statfs,
1608         .show_options   = ext4_show_options,
1609         .shutdown       = ext4_shutdown,
1610 #ifdef CONFIG_QUOTA
1611         .quota_read     = ext4_quota_read,
1612         .quota_write    = ext4_quota_write,
1613         .get_dquots     = ext4_get_dquots,
1614 #endif
1615 };
1616
1617 static const struct export_operations ext4_export_ops = {
1618         .fh_to_dentry = ext4_fh_to_dentry,
1619         .fh_to_parent = ext4_fh_to_parent,
1620         .get_parent = ext4_get_parent,
1621         .commit_metadata = ext4_nfs_commit_metadata,
1622 };
1623
1624 enum {
1625         Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1626         Opt_resgid, Opt_resuid, Opt_sb,
1627         Opt_nouid32, Opt_debug, Opt_removed,
1628         Opt_user_xattr, Opt_acl,
1629         Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
1630         Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev,
1631         Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit,
1632         Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
1633         Opt_data_err_abort, Opt_data_err_ignore, Opt_test_dummy_encryption,
1634         Opt_inlinecrypt,
1635         Opt_usrjquota, Opt_grpjquota, Opt_quota,
1636         Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
1637         Opt_usrquota, Opt_grpquota, Opt_prjquota,
1638         Opt_dax, Opt_dax_always, Opt_dax_inode, Opt_dax_never,
1639         Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_warn_on_error,
1640         Opt_nowarn_on_error, Opt_mblk_io_submit, Opt_debug_want_extra_isize,
1641         Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
1642         Opt_inode_readahead_blks, Opt_journal_ioprio,
1643         Opt_dioread_nolock, Opt_dioread_lock,
1644         Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
1645         Opt_max_dir_size_kb, Opt_nojournal_checksum, Opt_nombcache,
1646         Opt_no_prefetch_block_bitmaps, Opt_mb_optimize_scan,
1647         Opt_errors, Opt_data, Opt_data_err, Opt_jqfmt, Opt_dax_type,
1648 #ifdef CONFIG_EXT4_DEBUG
1649         Opt_fc_debug_max_replay, Opt_fc_debug_force
1650 #endif
1651 };
1652
1653 static const struct constant_table ext4_param_errors[] = {
1654         {"continue",    EXT4_MOUNT_ERRORS_CONT},
1655         {"panic",       EXT4_MOUNT_ERRORS_PANIC},
1656         {"remount-ro",  EXT4_MOUNT_ERRORS_RO},
1657         {}
1658 };
1659
1660 static const struct constant_table ext4_param_data[] = {
1661         {"journal",     EXT4_MOUNT_JOURNAL_DATA},
1662         {"ordered",     EXT4_MOUNT_ORDERED_DATA},
1663         {"writeback",   EXT4_MOUNT_WRITEBACK_DATA},
1664         {}
1665 };
1666
1667 static const struct constant_table ext4_param_data_err[] = {
1668         {"abort",       Opt_data_err_abort},
1669         {"ignore",      Opt_data_err_ignore},
1670         {}
1671 };
1672
1673 static const struct constant_table ext4_param_jqfmt[] = {
1674         {"vfsold",      QFMT_VFS_OLD},
1675         {"vfsv0",       QFMT_VFS_V0},
1676         {"vfsv1",       QFMT_VFS_V1},
1677         {}
1678 };
1679
1680 static const struct constant_table ext4_param_dax[] = {
1681         {"always",      Opt_dax_always},
1682         {"inode",       Opt_dax_inode},
1683         {"never",       Opt_dax_never},
1684         {}
1685 };
1686
1687 /* String parameter that allows empty argument */
1688 #define fsparam_string_empty(NAME, OPT) \
1689         __fsparam(fs_param_is_string, NAME, OPT, fs_param_can_be_empty, NULL)
1690
1691 /*
1692  * Mount option specification
1693  * We don't use fsparam_flag_no because of the way we set the
1694  * options and the way we show them in _ext4_show_options(). To
1695  * keep the changes to a minimum, let's keep the negative options
1696  * separate for now.
1697  */
1698 static const struct fs_parameter_spec ext4_param_specs[] = {
1699         fsparam_flag    ("bsddf",               Opt_bsd_df),
1700         fsparam_flag    ("minixdf",             Opt_minix_df),
1701         fsparam_flag    ("grpid",               Opt_grpid),
1702         fsparam_flag    ("bsdgroups",           Opt_grpid),
1703         fsparam_flag    ("nogrpid",             Opt_nogrpid),
1704         fsparam_flag    ("sysvgroups",          Opt_nogrpid),
1705         fsparam_u32     ("resgid",              Opt_resgid),
1706         fsparam_u32     ("resuid",              Opt_resuid),
1707         fsparam_u32     ("sb",                  Opt_sb),
1708         fsparam_enum    ("errors",              Opt_errors, ext4_param_errors),
1709         fsparam_flag    ("nouid32",             Opt_nouid32),
1710         fsparam_flag    ("debug",               Opt_debug),
1711         fsparam_flag    ("oldalloc",            Opt_removed),
1712         fsparam_flag    ("orlov",               Opt_removed),
1713         fsparam_flag    ("user_xattr",          Opt_user_xattr),
1714         fsparam_flag    ("acl",                 Opt_acl),
1715         fsparam_flag    ("norecovery",          Opt_noload),
1716         fsparam_flag    ("noload",              Opt_noload),
1717         fsparam_flag    ("bh",                  Opt_removed),
1718         fsparam_flag    ("nobh",                Opt_removed),
1719         fsparam_u32     ("commit",              Opt_commit),
1720         fsparam_u32     ("min_batch_time",      Opt_min_batch_time),
1721         fsparam_u32     ("max_batch_time",      Opt_max_batch_time),
1722         fsparam_u32     ("journal_dev",         Opt_journal_dev),
1723         fsparam_bdev    ("journal_path",        Opt_journal_path),
1724         fsparam_flag    ("journal_checksum",    Opt_journal_checksum),
1725         fsparam_flag    ("nojournal_checksum",  Opt_nojournal_checksum),
1726         fsparam_flag    ("journal_async_commit",Opt_journal_async_commit),
1727         fsparam_flag    ("abort",               Opt_abort),
1728         fsparam_enum    ("data",                Opt_data, ext4_param_data),
1729         fsparam_enum    ("data_err",            Opt_data_err,
1730                                                 ext4_param_data_err),
1731         fsparam_string_empty
1732                         ("usrjquota",           Opt_usrjquota),
1733         fsparam_string_empty
1734                         ("grpjquota",           Opt_grpjquota),
1735         fsparam_enum    ("jqfmt",               Opt_jqfmt, ext4_param_jqfmt),
1736         fsparam_flag    ("grpquota",            Opt_grpquota),
1737         fsparam_flag    ("quota",               Opt_quota),
1738         fsparam_flag    ("noquota",             Opt_noquota),
1739         fsparam_flag    ("usrquota",            Opt_usrquota),
1740         fsparam_flag    ("prjquota",            Opt_prjquota),
1741         fsparam_flag    ("barrier",             Opt_barrier),
1742         fsparam_u32     ("barrier",             Opt_barrier),
1743         fsparam_flag    ("nobarrier",           Opt_nobarrier),
1744         fsparam_flag    ("i_version",           Opt_removed),
1745         fsparam_flag    ("dax",                 Opt_dax),
1746         fsparam_enum    ("dax",                 Opt_dax_type, ext4_param_dax),
1747         fsparam_u32     ("stripe",              Opt_stripe),
1748         fsparam_flag    ("delalloc",            Opt_delalloc),
1749         fsparam_flag    ("nodelalloc",          Opt_nodelalloc),
1750         fsparam_flag    ("warn_on_error",       Opt_warn_on_error),
1751         fsparam_flag    ("nowarn_on_error",     Opt_nowarn_on_error),
1752         fsparam_u32     ("debug_want_extra_isize",
1753                                                 Opt_debug_want_extra_isize),
1754         fsparam_flag    ("mblk_io_submit",      Opt_removed),
1755         fsparam_flag    ("nomblk_io_submit",    Opt_removed),
1756         fsparam_flag    ("block_validity",      Opt_block_validity),
1757         fsparam_flag    ("noblock_validity",    Opt_noblock_validity),
1758         fsparam_u32     ("inode_readahead_blks",
1759                                                 Opt_inode_readahead_blks),
1760         fsparam_u32     ("journal_ioprio",      Opt_journal_ioprio),
1761         fsparam_u32     ("auto_da_alloc",       Opt_auto_da_alloc),
1762         fsparam_flag    ("auto_da_alloc",       Opt_auto_da_alloc),
1763         fsparam_flag    ("noauto_da_alloc",     Opt_noauto_da_alloc),
1764         fsparam_flag    ("dioread_nolock",      Opt_dioread_nolock),
1765         fsparam_flag    ("nodioread_nolock",    Opt_dioread_lock),
1766         fsparam_flag    ("dioread_lock",        Opt_dioread_lock),
1767         fsparam_flag    ("discard",             Opt_discard),
1768         fsparam_flag    ("nodiscard",           Opt_nodiscard),
1769         fsparam_u32     ("init_itable",         Opt_init_itable),
1770         fsparam_flag    ("init_itable",         Opt_init_itable),
1771         fsparam_flag    ("noinit_itable",       Opt_noinit_itable),
1772 #ifdef CONFIG_EXT4_DEBUG
1773         fsparam_flag    ("fc_debug_force",      Opt_fc_debug_force),
1774         fsparam_u32     ("fc_debug_max_replay", Opt_fc_debug_max_replay),
1775 #endif
1776         fsparam_u32     ("max_dir_size_kb",     Opt_max_dir_size_kb),
1777         fsparam_flag    ("test_dummy_encryption",
1778                                                 Opt_test_dummy_encryption),
1779         fsparam_string  ("test_dummy_encryption",
1780                                                 Opt_test_dummy_encryption),
1781         fsparam_flag    ("inlinecrypt",         Opt_inlinecrypt),
1782         fsparam_flag    ("nombcache",           Opt_nombcache),
1783         fsparam_flag    ("no_mbcache",          Opt_nombcache), /* for backward compatibility */
1784         fsparam_flag    ("prefetch_block_bitmaps",
1785                                                 Opt_removed),
1786         fsparam_flag    ("no_prefetch_block_bitmaps",
1787                                                 Opt_no_prefetch_block_bitmaps),
1788         fsparam_s32     ("mb_optimize_scan",    Opt_mb_optimize_scan),
1789         fsparam_string  ("check",               Opt_removed),   /* mount option from ext2/3 */
1790         fsparam_flag    ("nocheck",             Opt_removed),   /* mount option from ext2/3 */
1791         fsparam_flag    ("reservation",         Opt_removed),   /* mount option from ext2/3 */
1792         fsparam_flag    ("noreservation",       Opt_removed),   /* mount option from ext2/3 */
1793         fsparam_u32     ("journal",             Opt_removed),   /* mount option from ext2/3 */
1794         {}
1795 };
1796
1797 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1798
1799 #define MOPT_SET        0x0001
1800 #define MOPT_CLEAR      0x0002
1801 #define MOPT_NOSUPPORT  0x0004
1802 #define MOPT_EXPLICIT   0x0008
1803 #ifdef CONFIG_QUOTA
1804 #define MOPT_Q          0
1805 #define MOPT_QFMT       0x0010
1806 #else
1807 #define MOPT_Q          MOPT_NOSUPPORT
1808 #define MOPT_QFMT       MOPT_NOSUPPORT
1809 #endif
1810 #define MOPT_NO_EXT2    0x0020
1811 #define MOPT_NO_EXT3    0x0040
1812 #define MOPT_EXT4_ONLY  (MOPT_NO_EXT2 | MOPT_NO_EXT3)
1813 #define MOPT_SKIP       0x0080
1814 #define MOPT_2          0x0100
1815
1816 static const struct mount_opts {
1817         int     token;
1818         int     mount_opt;
1819         int     flags;
1820 } ext4_mount_opts[] = {
1821         {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
1822         {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
1823         {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
1824         {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
1825         {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
1826         {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
1827         {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK,
1828          MOPT_EXT4_ONLY | MOPT_SET},
1829         {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK,
1830          MOPT_EXT4_ONLY | MOPT_CLEAR},
1831         {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
1832         {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
1833         {Opt_delalloc, EXT4_MOUNT_DELALLOC,
1834          MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1835         {Opt_nodelalloc, EXT4_MOUNT_DELALLOC,
1836          MOPT_EXT4_ONLY | MOPT_CLEAR},
1837         {Opt_warn_on_error, EXT4_MOUNT_WARN_ON_ERROR, MOPT_SET},
1838         {Opt_nowarn_on_error, EXT4_MOUNT_WARN_ON_ERROR, MOPT_CLEAR},
1839         {Opt_commit, 0, MOPT_NO_EXT2},
1840         {Opt_nojournal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1841          MOPT_EXT4_ONLY | MOPT_CLEAR},
1842         {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1843          MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1844         {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
1845                                     EXT4_MOUNT_JOURNAL_CHECKSUM),
1846          MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1847         {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET},
1848         {Opt_data_err, EXT4_MOUNT_DATA_ERR_ABORT, MOPT_NO_EXT2},
1849         {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
1850         {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
1851         {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
1852         {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
1853         {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
1854         {Opt_dax_type, 0, MOPT_EXT4_ONLY},
1855         {Opt_journal_dev, 0, MOPT_NO_EXT2},
1856         {Opt_journal_path, 0, MOPT_NO_EXT2},
1857         {Opt_journal_ioprio, 0, MOPT_NO_EXT2},
1858         {Opt_data, 0, MOPT_NO_EXT2},
1859         {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
1860 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1861         {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
1862 #else
1863         {Opt_acl, 0, MOPT_NOSUPPORT},
1864 #endif
1865         {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1866         {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
1867         {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1868         {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1869                                                         MOPT_SET | MOPT_Q},
1870         {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1871                                                         MOPT_SET | MOPT_Q},
1872         {Opt_prjquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_PRJQUOTA,
1873                                                         MOPT_SET | MOPT_Q},
1874         {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
1875                        EXT4_MOUNT_GRPQUOTA | EXT4_MOUNT_PRJQUOTA),
1876                                                         MOPT_CLEAR | MOPT_Q},
1877         {Opt_usrjquota, 0, MOPT_Q},
1878         {Opt_grpjquota, 0, MOPT_Q},
1879         {Opt_jqfmt, 0, MOPT_QFMT},
1880         {Opt_nombcache, EXT4_MOUNT_NO_MBCACHE, MOPT_SET},
1881         {Opt_no_prefetch_block_bitmaps, EXT4_MOUNT_NO_PREFETCH_BLOCK_BITMAPS,
1882          MOPT_SET},
1883 #ifdef CONFIG_EXT4_DEBUG
1884         {Opt_fc_debug_force, EXT4_MOUNT2_JOURNAL_FAST_COMMIT,
1885          MOPT_SET | MOPT_2 | MOPT_EXT4_ONLY},
1886 #endif
1887         {Opt_err, 0, 0}
1888 };
1889
1890 #if IS_ENABLED(CONFIG_UNICODE)
1891 static const struct ext4_sb_encodings {
1892         __u16 magic;
1893         char *name;
1894         unsigned int version;
1895 } ext4_sb_encoding_map[] = {
1896         {EXT4_ENC_UTF8_12_1, "utf8", UNICODE_AGE(12, 1, 0)},
1897 };
1898
1899 static const struct ext4_sb_encodings *
1900 ext4_sb_read_encoding(const struct ext4_super_block *es)
1901 {
1902         __u16 magic = le16_to_cpu(es->s_encoding);
1903         int i;
1904
1905         for (i = 0; i < ARRAY_SIZE(ext4_sb_encoding_map); i++)
1906                 if (magic == ext4_sb_encoding_map[i].magic)
1907                         return &ext4_sb_encoding_map[i];
1908
1909         return NULL;
1910 }
1911 #endif
1912
1913 #define EXT4_SPEC_JQUOTA                        (1 <<  0)
1914 #define EXT4_SPEC_JQFMT                         (1 <<  1)
1915 #define EXT4_SPEC_DATAJ                         (1 <<  2)
1916 #define EXT4_SPEC_SB_BLOCK                      (1 <<  3)
1917 #define EXT4_SPEC_JOURNAL_DEV                   (1 <<  4)
1918 #define EXT4_SPEC_JOURNAL_IOPRIO                (1 <<  5)
1919 #define EXT4_SPEC_s_want_extra_isize            (1 <<  7)
1920 #define EXT4_SPEC_s_max_batch_time              (1 <<  8)
1921 #define EXT4_SPEC_s_min_batch_time              (1 <<  9)
1922 #define EXT4_SPEC_s_inode_readahead_blks        (1 << 10)
1923 #define EXT4_SPEC_s_li_wait_mult                (1 << 11)
1924 #define EXT4_SPEC_s_max_dir_size_kb             (1 << 12)
1925 #define EXT4_SPEC_s_stripe                      (1 << 13)
1926 #define EXT4_SPEC_s_resuid                      (1 << 14)
1927 #define EXT4_SPEC_s_resgid                      (1 << 15)
1928 #define EXT4_SPEC_s_commit_interval             (1 << 16)
1929 #define EXT4_SPEC_s_fc_debug_max_replay         (1 << 17)
1930 #define EXT4_SPEC_s_sb_block                    (1 << 18)
1931 #define EXT4_SPEC_mb_optimize_scan              (1 << 19)
1932
1933 struct ext4_fs_context {
1934         char            *s_qf_names[EXT4_MAXQUOTAS];
1935         struct fscrypt_dummy_policy dummy_enc_policy;
1936         int             s_jquota_fmt;   /* Format of quota to use */
1937 #ifdef CONFIG_EXT4_DEBUG
1938         int s_fc_debug_max_replay;
1939 #endif
1940         unsigned short  qname_spec;
1941         unsigned long   vals_s_flags;   /* Bits to set in s_flags */
1942         unsigned long   mask_s_flags;   /* Bits changed in s_flags */
1943         unsigned long   journal_devnum;
1944         unsigned long   s_commit_interval;
1945         unsigned long   s_stripe;
1946         unsigned int    s_inode_readahead_blks;
1947         unsigned int    s_want_extra_isize;
1948         unsigned int    s_li_wait_mult;
1949         unsigned int    s_max_dir_size_kb;
1950         unsigned int    journal_ioprio;
1951         unsigned int    vals_s_mount_opt;
1952         unsigned int    mask_s_mount_opt;
1953         unsigned int    vals_s_mount_opt2;
1954         unsigned int    mask_s_mount_opt2;
1955         unsigned long   vals_s_mount_flags;
1956         unsigned long   mask_s_mount_flags;
1957         unsigned int    opt_flags;      /* MOPT flags */
1958         unsigned int    spec;
1959         u32             s_max_batch_time;
1960         u32             s_min_batch_time;
1961         kuid_t          s_resuid;
1962         kgid_t          s_resgid;
1963         ext4_fsblk_t    s_sb_block;
1964 };
1965
1966 static void ext4_fc_free(struct fs_context *fc)
1967 {
1968         struct ext4_fs_context *ctx = fc->fs_private;
1969         int i;
1970
1971         if (!ctx)
1972                 return;
1973
1974         for (i = 0; i < EXT4_MAXQUOTAS; i++)
1975                 kfree(ctx->s_qf_names[i]);
1976
1977         fscrypt_free_dummy_policy(&ctx->dummy_enc_policy);
1978         kfree(ctx);
1979 }
1980
1981 int ext4_init_fs_context(struct fs_context *fc)
1982 {
1983         struct ext4_fs_context *ctx;
1984
1985         ctx = kzalloc(sizeof(struct ext4_fs_context), GFP_KERNEL);
1986         if (!ctx)
1987                 return -ENOMEM;
1988
1989         fc->fs_private = ctx;
1990         fc->ops = &ext4_context_ops;
1991
1992         return 0;
1993 }
1994
1995 #ifdef CONFIG_QUOTA
1996 /*
1997  * Note the name of the specified quota file.
1998  */
1999 static int note_qf_name(struct fs_context *fc, int qtype,
2000                        struct fs_parameter *param)
2001 {
2002         struct ext4_fs_context *ctx = fc->fs_private;
2003         char *qname;
2004
2005         if (param->size < 1) {
2006                 ext4_msg(NULL, KERN_ERR, "Missing quota name");
2007                 return -EINVAL;
2008         }
2009         if (strchr(param->string, '/')) {
2010                 ext4_msg(NULL, KERN_ERR,
2011                          "quotafile must be on filesystem root");
2012                 return -EINVAL;
2013         }
2014         if (ctx->s_qf_names[qtype]) {
2015                 if (strcmp(ctx->s_qf_names[qtype], param->string) != 0) {
2016                         ext4_msg(NULL, KERN_ERR,
2017                                  "%s quota file already specified",
2018                                  QTYPE2NAME(qtype));
2019                         return -EINVAL;
2020                 }
2021                 return 0;
2022         }
2023
2024         qname = kmemdup_nul(param->string, param->size, GFP_KERNEL);
2025         if (!qname) {
2026                 ext4_msg(NULL, KERN_ERR,
2027                          "Not enough memory for storing quotafile name");
2028                 return -ENOMEM;
2029         }
2030         ctx->s_qf_names[qtype] = qname;
2031         ctx->qname_spec |= 1 << qtype;
2032         ctx->spec |= EXT4_SPEC_JQUOTA;
2033         return 0;
2034 }
2035
2036 /*
2037  * Clear the name of the specified quota file.
2038  */
2039 static int unnote_qf_name(struct fs_context *fc, int qtype)
2040 {
2041         struct ext4_fs_context *ctx = fc->fs_private;
2042
2043         if (ctx->s_qf_names[qtype])
2044                 kfree(ctx->s_qf_names[qtype]);
2045
2046         ctx->s_qf_names[qtype] = NULL;
2047         ctx->qname_spec |= 1 << qtype;
2048         ctx->spec |= EXT4_SPEC_JQUOTA;
2049         return 0;
2050 }
2051 #endif
2052
2053 static int ext4_parse_test_dummy_encryption(const struct fs_parameter *param,
2054                                             struct ext4_fs_context *ctx)
2055 {
2056         int err;
2057
2058         if (!IS_ENABLED(CONFIG_FS_ENCRYPTION)) {
2059                 ext4_msg(NULL, KERN_WARNING,
2060                          "test_dummy_encryption option not supported");
2061                 return -EINVAL;
2062         }
2063         err = fscrypt_parse_test_dummy_encryption(param,
2064                                                   &ctx->dummy_enc_policy);
2065         if (err == -EINVAL) {
2066                 ext4_msg(NULL, KERN_WARNING,
2067                          "Value of option \"%s\" is unrecognized", param->key);
2068         } else if (err == -EEXIST) {
2069                 ext4_msg(NULL, KERN_WARNING,
2070                          "Conflicting test_dummy_encryption options");
2071                 return -EINVAL;
2072         }
2073         return err;
2074 }
2075
2076 #define EXT4_SET_CTX(name)                                              \
2077 static inline void ctx_set_##name(struct ext4_fs_context *ctx,          \
2078                                   unsigned long flag)                   \
2079 {                                                                       \
2080         ctx->mask_s_##name |= flag;                                     \
2081         ctx->vals_s_##name |= flag;                                     \
2082 }
2083
2084 #define EXT4_CLEAR_CTX(name)                                            \
2085 static inline void ctx_clear_##name(struct ext4_fs_context *ctx,        \
2086                                     unsigned long flag)                 \
2087 {                                                                       \
2088         ctx->mask_s_##name |= flag;                                     \
2089         ctx->vals_s_##name &= ~flag;                                    \
2090 }
2091
2092 #define EXT4_TEST_CTX(name)                                             \
2093 static inline unsigned long                                             \
2094 ctx_test_##name(struct ext4_fs_context *ctx, unsigned long flag)        \
2095 {                                                                       \
2096         return (ctx->vals_s_##name & flag);                             \
2097 }
2098
2099 EXT4_SET_CTX(flags); /* set only */
2100 EXT4_SET_CTX(mount_opt);
2101 EXT4_CLEAR_CTX(mount_opt);
2102 EXT4_TEST_CTX(mount_opt);
2103 EXT4_SET_CTX(mount_opt2);
2104 EXT4_CLEAR_CTX(mount_opt2);
2105 EXT4_TEST_CTX(mount_opt2);
2106
2107 static inline void ctx_set_mount_flag(struct ext4_fs_context *ctx, int bit)
2108 {
2109         set_bit(bit, &ctx->mask_s_mount_flags);
2110         set_bit(bit, &ctx->vals_s_mount_flags);
2111 }
2112
2113 static int ext4_parse_param(struct fs_context *fc, struct fs_parameter *param)
2114 {
2115         struct ext4_fs_context *ctx = fc->fs_private;
2116         struct fs_parse_result result;
2117         const struct mount_opts *m;
2118         int is_remount;
2119         kuid_t uid;
2120         kgid_t gid;
2121         int token;
2122
2123         token = fs_parse(fc, ext4_param_specs, param, &result);
2124         if (token < 0)
2125                 return token;
2126         is_remount = fc->purpose == FS_CONTEXT_FOR_RECONFIGURE;
2127
2128         for (m = ext4_mount_opts; m->token != Opt_err; m++)
2129                 if (token == m->token)
2130                         break;
2131
2132         ctx->opt_flags |= m->flags;
2133
2134         if (m->flags & MOPT_EXPLICIT) {
2135                 if (m->mount_opt & EXT4_MOUNT_DELALLOC) {
2136                         ctx_set_mount_opt2(ctx, EXT4_MOUNT2_EXPLICIT_DELALLOC);
2137                 } else if (m->mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) {
2138                         ctx_set_mount_opt2(ctx,
2139                                        EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM);
2140                 } else
2141                         return -EINVAL;
2142         }
2143
2144         if (m->flags & MOPT_NOSUPPORT) {
2145                 ext4_msg(NULL, KERN_ERR, "%s option not supported",
2146                          param->key);
2147                 return 0;
2148         }
2149
2150         switch (token) {
2151 #ifdef CONFIG_QUOTA
2152         case Opt_usrjquota:
2153                 if (!*param->string)
2154                         return unnote_qf_name(fc, USRQUOTA);
2155                 else
2156                         return note_qf_name(fc, USRQUOTA, param);
2157         case Opt_grpjquota:
2158                 if (!*param->string)
2159                         return unnote_qf_name(fc, GRPQUOTA);
2160                 else
2161                         return note_qf_name(fc, GRPQUOTA, param);
2162 #endif
2163         case Opt_sb:
2164                 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) {
2165                         ext4_msg(NULL, KERN_WARNING,
2166                                  "Ignoring %s option on remount", param->key);
2167                 } else {
2168                         ctx->s_sb_block = result.uint_32;
2169                         ctx->spec |= EXT4_SPEC_s_sb_block;
2170                 }
2171                 return 0;
2172         case Opt_removed:
2173                 ext4_msg(NULL, KERN_WARNING, "Ignoring removed %s option",
2174                          param->key);
2175                 return 0;
2176         case Opt_abort:
2177                 ctx_set_mount_flag(ctx, EXT4_MF_FS_ABORTED);
2178                 return 0;
2179         case Opt_inlinecrypt:
2180 #ifdef CONFIG_FS_ENCRYPTION_INLINE_CRYPT
2181                 ctx_set_flags(ctx, SB_INLINECRYPT);
2182 #else
2183                 ext4_msg(NULL, KERN_ERR, "inline encryption not supported");
2184 #endif
2185                 return 0;
2186         case Opt_errors:
2187                 ctx_clear_mount_opt(ctx, EXT4_MOUNT_ERRORS_MASK);
2188                 ctx_set_mount_opt(ctx, result.uint_32);
2189                 return 0;
2190 #ifdef CONFIG_QUOTA
2191         case Opt_jqfmt:
2192                 ctx->s_jquota_fmt = result.uint_32;
2193                 ctx->spec |= EXT4_SPEC_JQFMT;
2194                 return 0;
2195 #endif
2196         case Opt_data:
2197                 ctx_clear_mount_opt(ctx, EXT4_MOUNT_DATA_FLAGS);
2198                 ctx_set_mount_opt(ctx, result.uint_32);
2199                 ctx->spec |= EXT4_SPEC_DATAJ;
2200                 return 0;
2201         case Opt_commit:
2202                 if (result.uint_32 == 0)
2203                         result.uint_32 = JBD2_DEFAULT_MAX_COMMIT_AGE;
2204                 else if (result.uint_32 > INT_MAX / HZ) {
2205                         ext4_msg(NULL, KERN_ERR,
2206                                  "Invalid commit interval %d, "
2207                                  "must be smaller than %d",
2208                                  result.uint_32, INT_MAX / HZ);
2209                         return -EINVAL;
2210                 }
2211                 ctx->s_commit_interval = HZ * result.uint_32;
2212                 ctx->spec |= EXT4_SPEC_s_commit_interval;
2213                 return 0;
2214         case Opt_debug_want_extra_isize:
2215                 if ((result.uint_32 & 1) || (result.uint_32 < 4)) {
2216                         ext4_msg(NULL, KERN_ERR,
2217                                  "Invalid want_extra_isize %d", result.uint_32);
2218                         return -EINVAL;
2219                 }
2220                 ctx->s_want_extra_isize = result.uint_32;
2221                 ctx->spec |= EXT4_SPEC_s_want_extra_isize;
2222                 return 0;
2223         case Opt_max_batch_time:
2224                 ctx->s_max_batch_time = result.uint_32;
2225                 ctx->spec |= EXT4_SPEC_s_max_batch_time;
2226                 return 0;
2227         case Opt_min_batch_time:
2228                 ctx->s_min_batch_time = result.uint_32;
2229                 ctx->spec |= EXT4_SPEC_s_min_batch_time;
2230                 return 0;
2231         case Opt_inode_readahead_blks:
2232                 if (result.uint_32 &&
2233                     (result.uint_32 > (1 << 30) ||
2234                      !is_power_of_2(result.uint_32))) {
2235                         ext4_msg(NULL, KERN_ERR,
2236                                  "EXT4-fs: inode_readahead_blks must be "
2237                                  "0 or a power of 2 smaller than 2^31");
2238                         return -EINVAL;
2239                 }
2240                 ctx->s_inode_readahead_blks = result.uint_32;
2241                 ctx->spec |= EXT4_SPEC_s_inode_readahead_blks;
2242                 return 0;
2243         case Opt_init_itable:
2244                 ctx_set_mount_opt(ctx, EXT4_MOUNT_INIT_INODE_TABLE);
2245                 ctx->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
2246                 if (param->type == fs_value_is_string)
2247                         ctx->s_li_wait_mult = result.uint_32;
2248                 ctx->spec |= EXT4_SPEC_s_li_wait_mult;
2249                 return 0;
2250         case Opt_max_dir_size_kb:
2251                 ctx->s_max_dir_size_kb = result.uint_32;
2252                 ctx->spec |= EXT4_SPEC_s_max_dir_size_kb;
2253                 return 0;
2254 #ifdef CONFIG_EXT4_DEBUG
2255         case Opt_fc_debug_max_replay:
2256                 ctx->s_fc_debug_max_replay = result.uint_32;
2257                 ctx->spec |= EXT4_SPEC_s_fc_debug_max_replay;
2258                 return 0;
2259 #endif
2260         case Opt_stripe:
2261                 ctx->s_stripe = result.uint_32;
2262                 ctx->spec |= EXT4_SPEC_s_stripe;
2263                 return 0;
2264         case Opt_resuid:
2265                 uid = make_kuid(current_user_ns(), result.uint_32);
2266                 if (!uid_valid(uid)) {
2267                         ext4_msg(NULL, KERN_ERR, "Invalid uid value %d",
2268                                  result.uint_32);
2269                         return -EINVAL;
2270                 }
2271                 ctx->s_resuid = uid;
2272                 ctx->spec |= EXT4_SPEC_s_resuid;
2273                 return 0;
2274         case Opt_resgid:
2275                 gid = make_kgid(current_user_ns(), result.uint_32);
2276                 if (!gid_valid(gid)) {
2277                         ext4_msg(NULL, KERN_ERR, "Invalid gid value %d",
2278                                  result.uint_32);
2279                         return -EINVAL;
2280                 }
2281                 ctx->s_resgid = gid;
2282                 ctx->spec |= EXT4_SPEC_s_resgid;
2283                 return 0;
2284         case Opt_journal_dev:
2285                 if (is_remount) {
2286                         ext4_msg(NULL, KERN_ERR,
2287                                  "Cannot specify journal on remount");
2288                         return -EINVAL;
2289                 }
2290                 ctx->journal_devnum = result.uint_32;
2291                 ctx->spec |= EXT4_SPEC_JOURNAL_DEV;
2292                 return 0;
2293         case Opt_journal_path:
2294         {
2295                 struct inode *journal_inode;
2296                 struct path path;
2297                 int error;
2298
2299                 if (is_remount) {
2300                         ext4_msg(NULL, KERN_ERR,
2301                                  "Cannot specify journal on remount");
2302                         return -EINVAL;
2303                 }
2304
2305                 error = fs_lookup_param(fc, param, 1, LOOKUP_FOLLOW, &path);
2306                 if (error) {
2307                         ext4_msg(NULL, KERN_ERR, "error: could not find "
2308                                  "journal device path");
2309                         return -EINVAL;
2310                 }
2311
2312                 journal_inode = d_inode(path.dentry);
2313                 ctx->journal_devnum = new_encode_dev(journal_inode->i_rdev);
2314                 ctx->spec |= EXT4_SPEC_JOURNAL_DEV;
2315                 path_put(&path);
2316                 return 0;
2317         }
2318         case Opt_journal_ioprio:
2319                 if (result.uint_32 > 7) {
2320                         ext4_msg(NULL, KERN_ERR, "Invalid journal IO priority"
2321                                  " (must be 0-7)");
2322                         return -EINVAL;
2323                 }
2324                 ctx->journal_ioprio =
2325                         IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, result.uint_32);
2326                 ctx->spec |= EXT4_SPEC_JOURNAL_IOPRIO;
2327                 return 0;
2328         case Opt_test_dummy_encryption:
2329                 return ext4_parse_test_dummy_encryption(param, ctx);
2330         case Opt_dax:
2331         case Opt_dax_type:
2332 #ifdef CONFIG_FS_DAX
2333         {
2334                 int type = (token == Opt_dax) ?
2335                            Opt_dax : result.uint_32;
2336
2337                 switch (type) {
2338                 case Opt_dax:
2339                 case Opt_dax_always:
2340                         ctx_set_mount_opt(ctx, EXT4_MOUNT_DAX_ALWAYS);
2341                         ctx_clear_mount_opt2(ctx, EXT4_MOUNT2_DAX_NEVER);
2342                         break;
2343                 case Opt_dax_never:
2344                         ctx_set_mount_opt2(ctx, EXT4_MOUNT2_DAX_NEVER);
2345                         ctx_clear_mount_opt(ctx, EXT4_MOUNT_DAX_ALWAYS);
2346                         break;
2347                 case Opt_dax_inode:
2348                         ctx_clear_mount_opt(ctx, EXT4_MOUNT_DAX_ALWAYS);
2349                         ctx_clear_mount_opt2(ctx, EXT4_MOUNT2_DAX_NEVER);
2350                         /* Strictly for printing options */
2351                         ctx_set_mount_opt2(ctx, EXT4_MOUNT2_DAX_INODE);
2352                         break;
2353                 }
2354                 return 0;
2355         }
2356 #else
2357                 ext4_msg(NULL, KERN_INFO, "dax option not supported");
2358                 return -EINVAL;
2359 #endif
2360         case Opt_data_err:
2361                 if (result.uint_32 == Opt_data_err_abort)
2362                         ctx_set_mount_opt(ctx, m->mount_opt);
2363                 else if (result.uint_32 == Opt_data_err_ignore)
2364                         ctx_clear_mount_opt(ctx, m->mount_opt);
2365                 return 0;
2366         case Opt_mb_optimize_scan:
2367                 if (result.int_32 == 1) {
2368                         ctx_set_mount_opt2(ctx, EXT4_MOUNT2_MB_OPTIMIZE_SCAN);
2369                         ctx->spec |= EXT4_SPEC_mb_optimize_scan;
2370                 } else if (result.int_32 == 0) {
2371                         ctx_clear_mount_opt2(ctx, EXT4_MOUNT2_MB_OPTIMIZE_SCAN);
2372                         ctx->spec |= EXT4_SPEC_mb_optimize_scan;
2373                 } else {
2374                         ext4_msg(NULL, KERN_WARNING,
2375                                  "mb_optimize_scan should be set to 0 or 1.");
2376                         return -EINVAL;
2377                 }
2378                 return 0;
2379         }
2380
2381         /*
2382          * At this point we should only be getting options requiring MOPT_SET,
2383          * or MOPT_CLEAR. Anything else is a bug
2384          */
2385         if (m->token == Opt_err) {
2386                 ext4_msg(NULL, KERN_WARNING, "buggy handling of option %s",
2387                          param->key);
2388                 WARN_ON(1);
2389                 return -EINVAL;
2390         }
2391
2392         else {
2393                 unsigned int set = 0;
2394
2395                 if ((param->type == fs_value_is_flag) ||
2396                     result.uint_32 > 0)
2397                         set = 1;
2398
2399                 if (m->flags & MOPT_CLEAR)
2400                         set = !set;
2401                 else if (unlikely(!(m->flags & MOPT_SET))) {
2402                         ext4_msg(NULL, KERN_WARNING,
2403                                  "buggy handling of option %s",
2404                                  param->key);
2405                         WARN_ON(1);
2406                         return -EINVAL;
2407                 }
2408                 if (m->flags & MOPT_2) {
2409                         if (set != 0)
2410                                 ctx_set_mount_opt2(ctx, m->mount_opt);
2411                         else
2412                                 ctx_clear_mount_opt2(ctx, m->mount_opt);
2413                 } else {
2414                         if (set != 0)
2415                                 ctx_set_mount_opt(ctx, m->mount_opt);
2416                         else
2417                                 ctx_clear_mount_opt(ctx, m->mount_opt);
2418                 }
2419         }
2420
2421         return 0;
2422 }
2423
2424 static int parse_options(struct fs_context *fc, char *options)
2425 {
2426         struct fs_parameter param;
2427         int ret;
2428         char *key;
2429
2430         if (!options)
2431                 return 0;
2432
2433         while ((key = strsep(&options, ",")) != NULL) {
2434                 if (*key) {
2435                         size_t v_len = 0;
2436                         char *value = strchr(key, '=');
2437
2438                         param.type = fs_value_is_flag;
2439                         param.string = NULL;
2440
2441                         if (value) {
2442                                 if (value == key)
2443                                         continue;
2444
2445                                 *value++ = 0;
2446                                 v_len = strlen(value);
2447                                 param.string = kmemdup_nul(value, v_len,
2448                                                            GFP_KERNEL);
2449                                 if (!param.string)
2450                                         return -ENOMEM;
2451                                 param.type = fs_value_is_string;
2452                         }
2453
2454                         param.key = key;
2455                         param.size = v_len;
2456
2457                         ret = ext4_parse_param(fc, &param);
2458                         if (param.string)
2459                                 kfree(param.string);
2460                         if (ret < 0)
2461                                 return ret;
2462                 }
2463         }
2464
2465         ret = ext4_validate_options(fc);
2466         if (ret < 0)
2467                 return ret;
2468
2469         return 0;
2470 }
2471
2472 static int parse_apply_sb_mount_options(struct super_block *sb,
2473                                         struct ext4_fs_context *m_ctx)
2474 {
2475         struct ext4_sb_info *sbi = EXT4_SB(sb);
2476         char *s_mount_opts = NULL;
2477         struct ext4_fs_context *s_ctx = NULL;
2478         struct fs_context *fc = NULL;
2479         int ret = -ENOMEM;
2480
2481         if (!sbi->s_es->s_mount_opts[0])
2482                 return 0;
2483
2484         s_mount_opts = kstrndup(sbi->s_es->s_mount_opts,
2485                                 sizeof(sbi->s_es->s_mount_opts),
2486                                 GFP_KERNEL);
2487         if (!s_mount_opts)
2488                 return ret;
2489
2490         fc = kzalloc(sizeof(struct fs_context), GFP_KERNEL);
2491         if (!fc)
2492                 goto out_free;
2493
2494         s_ctx = kzalloc(sizeof(struct ext4_fs_context), GFP_KERNEL);
2495         if (!s_ctx)
2496                 goto out_free;
2497
2498         fc->fs_private = s_ctx;
2499         fc->s_fs_info = sbi;
2500
2501         ret = parse_options(fc, s_mount_opts);
2502         if (ret < 0)
2503                 goto parse_failed;
2504
2505         ret = ext4_check_opt_consistency(fc, sb);
2506         if (ret < 0) {
2507 parse_failed:
2508                 ext4_msg(sb, KERN_WARNING,
2509                          "failed to parse options in superblock: %s",
2510                          s_mount_opts);
2511                 ret = 0;
2512                 goto out_free;
2513         }
2514
2515         if (s_ctx->spec & EXT4_SPEC_JOURNAL_DEV)
2516                 m_ctx->journal_devnum = s_ctx->journal_devnum;
2517         if (s_ctx->spec & EXT4_SPEC_JOURNAL_IOPRIO)
2518                 m_ctx->journal_ioprio = s_ctx->journal_ioprio;
2519
2520         ext4_apply_options(fc, sb);
2521         ret = 0;
2522
2523 out_free:
2524         if (fc) {
2525                 ext4_fc_free(fc);
2526                 kfree(fc);
2527         }
2528         kfree(s_mount_opts);
2529         return ret;
2530 }
2531
2532 static void ext4_apply_quota_options(struct fs_context *fc,
2533                                      struct super_block *sb)
2534 {
2535 #ifdef CONFIG_QUOTA
2536         bool quota_feature = ext4_has_feature_quota(sb);
2537         struct ext4_fs_context *ctx = fc->fs_private;
2538         struct ext4_sb_info *sbi = EXT4_SB(sb);
2539         char *qname;
2540         int i;
2541
2542         if (quota_feature)
2543                 return;
2544
2545         if (ctx->spec & EXT4_SPEC_JQUOTA) {
2546                 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
2547                         if (!(ctx->qname_spec & (1 << i)))
2548                                 continue;
2549
2550                         qname = ctx->s_qf_names[i]; /* May be NULL */
2551                         if (qname)
2552                                 set_opt(sb, QUOTA);
2553                         ctx->s_qf_names[i] = NULL;
2554                         qname = rcu_replace_pointer(sbi->s_qf_names[i], qname,
2555                                                 lockdep_is_held(&sb->s_umount));
2556                         if (qname)
2557                                 kfree_rcu_mightsleep(qname);
2558                 }
2559         }
2560
2561         if (ctx->spec & EXT4_SPEC_JQFMT)
2562                 sbi->s_jquota_fmt = ctx->s_jquota_fmt;
2563 #endif
2564 }
2565
2566 /*
2567  * Check quota settings consistency.
2568  */
2569 static int ext4_check_quota_consistency(struct fs_context *fc,
2570                                         struct super_block *sb)
2571 {
2572 #ifdef CONFIG_QUOTA
2573         struct ext4_fs_context *ctx = fc->fs_private;
2574         struct ext4_sb_info *sbi = EXT4_SB(sb);
2575         bool quota_feature = ext4_has_feature_quota(sb);
2576         bool quota_loaded = sb_any_quota_loaded(sb);
2577         bool usr_qf_name, grp_qf_name, usrquota, grpquota;
2578         int quota_flags, i;
2579
2580         /*
2581          * We do the test below only for project quotas. 'usrquota' and
2582          * 'grpquota' mount options are allowed even without quota feature
2583          * to support legacy quotas in quota files.
2584          */
2585         if (ctx_test_mount_opt(ctx, EXT4_MOUNT_PRJQUOTA) &&
2586             !ext4_has_feature_project(sb)) {
2587                 ext4_msg(NULL, KERN_ERR, "Project quota feature not enabled. "
2588                          "Cannot enable project quota enforcement.");
2589                 return -EINVAL;
2590         }
2591
2592         quota_flags = EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
2593                       EXT4_MOUNT_GRPQUOTA | EXT4_MOUNT_PRJQUOTA;
2594         if (quota_loaded &&
2595             ctx->mask_s_mount_opt & quota_flags &&
2596             !ctx_test_mount_opt(ctx, quota_flags))
2597                 goto err_quota_change;
2598
2599         if (ctx->spec & EXT4_SPEC_JQUOTA) {
2600
2601                 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
2602                         if (!(ctx->qname_spec & (1 << i)))
2603                                 continue;
2604
2605                         if (quota_loaded &&
2606                             !!sbi->s_qf_names[i] != !!ctx->s_qf_names[i])
2607                                 goto err_jquota_change;
2608
2609                         if (sbi->s_qf_names[i] && ctx->s_qf_names[i] &&
2610                             strcmp(get_qf_name(sb, sbi, i),
2611                                    ctx->s_qf_names[i]) != 0)
2612                                 goto err_jquota_specified;
2613                 }
2614
2615                 if (quota_feature) {
2616                         ext4_msg(NULL, KERN_INFO,
2617                                  "Journaled quota options ignored when "
2618                                  "QUOTA feature is enabled");
2619                         return 0;
2620                 }
2621         }
2622
2623         if (ctx->spec & EXT4_SPEC_JQFMT) {
2624                 if (sbi->s_jquota_fmt != ctx->s_jquota_fmt && quota_loaded)
2625                         goto err_jquota_change;
2626                 if (quota_feature) {
2627                         ext4_msg(NULL, KERN_INFO, "Quota format mount options "
2628                                  "ignored when QUOTA feature is enabled");
2629                         return 0;
2630                 }
2631         }
2632
2633         /* Make sure we don't mix old and new quota format */
2634         usr_qf_name = (get_qf_name(sb, sbi, USRQUOTA) ||
2635                        ctx->s_qf_names[USRQUOTA]);
2636         grp_qf_name = (get_qf_name(sb, sbi, GRPQUOTA) ||
2637                        ctx->s_qf_names[GRPQUOTA]);
2638
2639         usrquota = (ctx_test_mount_opt(ctx, EXT4_MOUNT_USRQUOTA) ||
2640                     test_opt(sb, USRQUOTA));
2641
2642         grpquota = (ctx_test_mount_opt(ctx, EXT4_MOUNT_GRPQUOTA) ||
2643                     test_opt(sb, GRPQUOTA));
2644
2645         if (usr_qf_name) {
2646                 ctx_clear_mount_opt(ctx, EXT4_MOUNT_USRQUOTA);
2647                 usrquota = false;
2648         }
2649         if (grp_qf_name) {
2650                 ctx_clear_mount_opt(ctx, EXT4_MOUNT_GRPQUOTA);
2651                 grpquota = false;
2652         }
2653
2654         if (usr_qf_name || grp_qf_name) {
2655                 if (usrquota || grpquota) {
2656                         ext4_msg(NULL, KERN_ERR, "old and new quota "
2657                                  "format mixing");
2658                         return -EINVAL;
2659                 }
2660
2661                 if (!(ctx->spec & EXT4_SPEC_JQFMT || sbi->s_jquota_fmt)) {
2662                         ext4_msg(NULL, KERN_ERR, "journaled quota format "
2663                                  "not specified");
2664                         return -EINVAL;
2665                 }
2666         }
2667
2668         return 0;
2669
2670 err_quota_change:
2671         ext4_msg(NULL, KERN_ERR,
2672                  "Cannot change quota options when quota turned on");
2673         return -EINVAL;
2674 err_jquota_change:
2675         ext4_msg(NULL, KERN_ERR, "Cannot change journaled quota "
2676                  "options when quota turned on");
2677         return -EINVAL;
2678 err_jquota_specified:
2679         ext4_msg(NULL, KERN_ERR, "%s quota file already specified",
2680                  QTYPE2NAME(i));
2681         return -EINVAL;
2682 #else
2683         return 0;
2684 #endif
2685 }
2686
2687 static int ext4_check_test_dummy_encryption(const struct fs_context *fc,
2688                                             struct super_block *sb)
2689 {
2690         const struct ext4_fs_context *ctx = fc->fs_private;
2691         const struct ext4_sb_info *sbi = EXT4_SB(sb);
2692
2693         if (!fscrypt_is_dummy_policy_set(&ctx->dummy_enc_policy))
2694                 return 0;
2695
2696         if (!ext4_has_feature_encrypt(sb)) {
2697                 ext4_msg(NULL, KERN_WARNING,
2698                          "test_dummy_encryption requires encrypt feature");
2699                 return -EINVAL;
2700         }
2701         /*
2702          * This mount option is just for testing, and it's not worthwhile to
2703          * implement the extra complexity (e.g. RCU protection) that would be
2704          * needed to allow it to be set or changed during remount.  We do allow
2705          * it to be specified during remount, but only if there is no change.
2706          */
2707         if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) {
2708                 if (fscrypt_dummy_policies_equal(&sbi->s_dummy_enc_policy,
2709                                                  &ctx->dummy_enc_policy))
2710                         return 0;
2711                 ext4_msg(NULL, KERN_WARNING,
2712                          "Can't set or change test_dummy_encryption on remount");
2713                 return -EINVAL;
2714         }
2715         /* Also make sure s_mount_opts didn't contain a conflicting value. */
2716         if (fscrypt_is_dummy_policy_set(&sbi->s_dummy_enc_policy)) {
2717                 if (fscrypt_dummy_policies_equal(&sbi->s_dummy_enc_policy,
2718                                                  &ctx->dummy_enc_policy))
2719                         return 0;
2720                 ext4_msg(NULL, KERN_WARNING,
2721                          "Conflicting test_dummy_encryption options");
2722                 return -EINVAL;
2723         }
2724         return 0;
2725 }
2726
2727 static void ext4_apply_test_dummy_encryption(struct ext4_fs_context *ctx,
2728                                              struct super_block *sb)
2729 {
2730         if (!fscrypt_is_dummy_policy_set(&ctx->dummy_enc_policy) ||
2731             /* if already set, it was already verified to be the same */
2732             fscrypt_is_dummy_policy_set(&EXT4_SB(sb)->s_dummy_enc_policy))
2733                 return;
2734         EXT4_SB(sb)->s_dummy_enc_policy = ctx->dummy_enc_policy;
2735         memset(&ctx->dummy_enc_policy, 0, sizeof(ctx->dummy_enc_policy));
2736         ext4_msg(sb, KERN_WARNING, "Test dummy encryption mode enabled");
2737 }
2738
2739 static int ext4_check_opt_consistency(struct fs_context *fc,
2740                                       struct super_block *sb)
2741 {
2742         struct ext4_fs_context *ctx = fc->fs_private;
2743         struct ext4_sb_info *sbi = fc->s_fs_info;
2744         int is_remount = fc->purpose == FS_CONTEXT_FOR_RECONFIGURE;
2745         int err;
2746
2747         if ((ctx->opt_flags & MOPT_NO_EXT2) && IS_EXT2_SB(sb)) {
2748                 ext4_msg(NULL, KERN_ERR,
2749                          "Mount option(s) incompatible with ext2");
2750                 return -EINVAL;
2751         }
2752         if ((ctx->opt_flags & MOPT_NO_EXT3) && IS_EXT3_SB(sb)) {
2753                 ext4_msg(NULL, KERN_ERR,
2754                          "Mount option(s) incompatible with ext3");
2755                 return -EINVAL;
2756         }
2757
2758         if (ctx->s_want_extra_isize >
2759             (sbi->s_inode_size - EXT4_GOOD_OLD_INODE_SIZE)) {
2760                 ext4_msg(NULL, KERN_ERR,
2761                          "Invalid want_extra_isize %d",
2762                          ctx->s_want_extra_isize);
2763                 return -EINVAL;
2764         }
2765
2766         if (ctx_test_mount_opt(ctx, EXT4_MOUNT_DIOREAD_NOLOCK)) {
2767                 int blocksize =
2768                         BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
2769                 if (blocksize < PAGE_SIZE)
2770                         ext4_msg(NULL, KERN_WARNING, "Warning: mounting with an "
2771                                  "experimental mount option 'dioread_nolock' "
2772                                  "for blocksize < PAGE_SIZE");
2773         }
2774
2775         err = ext4_check_test_dummy_encryption(fc, sb);
2776         if (err)
2777                 return err;
2778
2779         if ((ctx->spec & EXT4_SPEC_DATAJ) && is_remount) {
2780                 if (!sbi->s_journal) {
2781                         ext4_msg(NULL, KERN_WARNING,
2782                                  "Remounting file system with no journal "
2783                                  "so ignoring journalled data option");
2784                         ctx_clear_mount_opt(ctx, EXT4_MOUNT_DATA_FLAGS);
2785                 } else if (ctx_test_mount_opt(ctx, EXT4_MOUNT_DATA_FLAGS) !=
2786                            test_opt(sb, DATA_FLAGS)) {
2787                         ext4_msg(NULL, KERN_ERR, "Cannot change data mode "
2788                                  "on remount");
2789                         return -EINVAL;
2790                 }
2791         }
2792
2793         if (is_remount) {
2794                 if (ctx_test_mount_opt(ctx, EXT4_MOUNT_DAX_ALWAYS) &&
2795                     (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)) {
2796                         ext4_msg(NULL, KERN_ERR, "can't mount with "
2797                                  "both data=journal and dax");
2798                         return -EINVAL;
2799                 }
2800
2801                 if (ctx_test_mount_opt(ctx, EXT4_MOUNT_DAX_ALWAYS) &&
2802                     (!(sbi->s_mount_opt & EXT4_MOUNT_DAX_ALWAYS) ||
2803                      (sbi->s_mount_opt2 & EXT4_MOUNT2_DAX_NEVER))) {
2804 fail_dax_change_remount:
2805                         ext4_msg(NULL, KERN_ERR, "can't change "
2806                                  "dax mount option while remounting");
2807                         return -EINVAL;
2808                 } else if (ctx_test_mount_opt2(ctx, EXT4_MOUNT2_DAX_NEVER) &&
2809                          (!(sbi->s_mount_opt2 & EXT4_MOUNT2_DAX_NEVER) ||
2810                           (sbi->s_mount_opt & EXT4_MOUNT_DAX_ALWAYS))) {
2811                         goto fail_dax_change_remount;
2812                 } else if (ctx_test_mount_opt2(ctx, EXT4_MOUNT2_DAX_INODE) &&
2813                            ((sbi->s_mount_opt & EXT4_MOUNT_DAX_ALWAYS) ||
2814                             (sbi->s_mount_opt2 & EXT4_MOUNT2_DAX_NEVER) ||
2815                             !(sbi->s_mount_opt2 & EXT4_MOUNT2_DAX_INODE))) {
2816                         goto fail_dax_change_remount;
2817                 }
2818         }
2819
2820         return ext4_check_quota_consistency(fc, sb);
2821 }
2822
2823 static void ext4_apply_options(struct fs_context *fc, struct super_block *sb)
2824 {
2825         struct ext4_fs_context *ctx = fc->fs_private;
2826         struct ext4_sb_info *sbi = fc->s_fs_info;
2827
2828         sbi->s_mount_opt &= ~ctx->mask_s_mount_opt;
2829         sbi->s_mount_opt |= ctx->vals_s_mount_opt;
2830         sbi->s_mount_opt2 &= ~ctx->mask_s_mount_opt2;
2831         sbi->s_mount_opt2 |= ctx->vals_s_mount_opt2;
2832         sbi->s_mount_flags &= ~ctx->mask_s_mount_flags;
2833         sbi->s_mount_flags |= ctx->vals_s_mount_flags;
2834         sb->s_flags &= ~ctx->mask_s_flags;
2835         sb->s_flags |= ctx->vals_s_flags;
2836
2837 #define APPLY(X) ({ if (ctx->spec & EXT4_SPEC_##X) sbi->X = ctx->X; })
2838         APPLY(s_commit_interval);
2839         APPLY(s_stripe);
2840         APPLY(s_max_batch_time);
2841         APPLY(s_min_batch_time);
2842         APPLY(s_want_extra_isize);
2843         APPLY(s_inode_readahead_blks);
2844         APPLY(s_max_dir_size_kb);
2845         APPLY(s_li_wait_mult);
2846         APPLY(s_resgid);
2847         APPLY(s_resuid);
2848
2849 #ifdef CONFIG_EXT4_DEBUG
2850         APPLY(s_fc_debug_max_replay);
2851 #endif
2852
2853         ext4_apply_quota_options(fc, sb);
2854         ext4_apply_test_dummy_encryption(ctx, sb);
2855 }
2856
2857
2858 static int ext4_validate_options(struct fs_context *fc)
2859 {
2860 #ifdef CONFIG_QUOTA
2861         struct ext4_fs_context *ctx = fc->fs_private;
2862         char *usr_qf_name, *grp_qf_name;
2863
2864         usr_qf_name = ctx->s_qf_names[USRQUOTA];
2865         grp_qf_name = ctx->s_qf_names[GRPQUOTA];
2866
2867         if (usr_qf_name || grp_qf_name) {
2868                 if (ctx_test_mount_opt(ctx, EXT4_MOUNT_USRQUOTA) && usr_qf_name)
2869                         ctx_clear_mount_opt(ctx, EXT4_MOUNT_USRQUOTA);
2870
2871                 if (ctx_test_mount_opt(ctx, EXT4_MOUNT_GRPQUOTA) && grp_qf_name)
2872                         ctx_clear_mount_opt(ctx, EXT4_MOUNT_GRPQUOTA);
2873
2874                 if (ctx_test_mount_opt(ctx, EXT4_MOUNT_USRQUOTA) ||
2875                     ctx_test_mount_opt(ctx, EXT4_MOUNT_GRPQUOTA)) {
2876                         ext4_msg(NULL, KERN_ERR, "old and new quota "
2877                                  "format mixing");
2878                         return -EINVAL;
2879                 }
2880         }
2881 #endif
2882         return 1;
2883 }
2884
2885 static inline void ext4_show_quota_options(struct seq_file *seq,
2886                                            struct super_block *sb)
2887 {
2888 #if defined(CONFIG_QUOTA)
2889         struct ext4_sb_info *sbi = EXT4_SB(sb);
2890         char *usr_qf_name, *grp_qf_name;
2891
2892         if (sbi->s_jquota_fmt) {
2893                 char *fmtname = "";
2894
2895                 switch (sbi->s_jquota_fmt) {
2896                 case QFMT_VFS_OLD:
2897                         fmtname = "vfsold";
2898                         break;
2899                 case QFMT_VFS_V0:
2900                         fmtname = "vfsv0";
2901                         break;
2902                 case QFMT_VFS_V1:
2903                         fmtname = "vfsv1";
2904                         break;
2905                 }
2906                 seq_printf(seq, ",jqfmt=%s", fmtname);
2907         }
2908
2909         rcu_read_lock();
2910         usr_qf_name = rcu_dereference(sbi->s_qf_names[USRQUOTA]);
2911         grp_qf_name = rcu_dereference(sbi->s_qf_names[GRPQUOTA]);
2912         if (usr_qf_name)
2913                 seq_show_option(seq, "usrjquota", usr_qf_name);
2914         if (grp_qf_name)
2915                 seq_show_option(seq, "grpjquota", grp_qf_name);
2916         rcu_read_unlock();
2917 #endif
2918 }
2919
2920 static const char *token2str(int token)
2921 {
2922         const struct fs_parameter_spec *spec;
2923
2924         for (spec = ext4_param_specs; spec->name != NULL; spec++)
2925                 if (spec->opt == token && !spec->type)
2926                         break;
2927         return spec->name;
2928 }
2929
2930 /*
2931  * Show an option if
2932  *  - it's set to a non-default value OR
2933  *  - if the per-sb default is different from the global default
2934  */
2935 static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
2936                               int nodefs)
2937 {
2938         struct ext4_sb_info *sbi = EXT4_SB(sb);
2939         struct ext4_super_block *es = sbi->s_es;
2940         int def_errors;
2941         const struct mount_opts *m;
2942         char sep = nodefs ? '\n' : ',';
2943
2944 #define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
2945 #define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
2946
2947         if (sbi->s_sb_block != 1)
2948                 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
2949
2950         for (m = ext4_mount_opts; m->token != Opt_err; m++) {
2951                 int want_set = m->flags & MOPT_SET;
2952                 int opt_2 = m->flags & MOPT_2;
2953                 unsigned int mount_opt, def_mount_opt;
2954
2955                 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
2956                     m->flags & MOPT_SKIP)
2957                         continue;
2958
2959                 if (opt_2) {
2960                         mount_opt = sbi->s_mount_opt2;
2961                         def_mount_opt = sbi->s_def_mount_opt2;
2962                 } else {
2963                         mount_opt = sbi->s_mount_opt;
2964                         def_mount_opt = sbi->s_def_mount_opt;
2965                 }
2966                 /* skip if same as the default */
2967                 if (!nodefs && !(m->mount_opt & (mount_opt ^ def_mount_opt)))
2968                         continue;
2969                 /* select Opt_noFoo vs Opt_Foo */
2970                 if ((want_set &&
2971                      (mount_opt & m->mount_opt) != m->mount_opt) ||
2972                     (!want_set && (mount_opt & m->mount_opt)))
2973                         continue;
2974                 SEQ_OPTS_PRINT("%s", token2str(m->token));
2975         }
2976
2977         if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
2978             le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
2979                 SEQ_OPTS_PRINT("resuid=%u",
2980                                 from_kuid_munged(&init_user_ns, sbi->s_resuid));
2981         if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) ||
2982             le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
2983                 SEQ_OPTS_PRINT("resgid=%u",
2984                                 from_kgid_munged(&init_user_ns, sbi->s_resgid));
2985         def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
2986         if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
2987                 SEQ_OPTS_PUTS("errors=remount-ro");
2988         if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
2989                 SEQ_OPTS_PUTS("errors=continue");
2990         if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
2991                 SEQ_OPTS_PUTS("errors=panic");
2992         if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
2993                 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
2994         if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
2995                 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
2996         if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
2997                 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
2998         if (nodefs || sbi->s_stripe)
2999                 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
3000         if (nodefs || EXT4_MOUNT_DATA_FLAGS &
3001                         (sbi->s_mount_opt ^ sbi->s_def_mount_opt)) {
3002                 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
3003                         SEQ_OPTS_PUTS("data=journal");
3004                 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
3005                         SEQ_OPTS_PUTS("data=ordered");
3006                 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
3007                         SEQ_OPTS_PUTS("data=writeback");
3008         }
3009         if (nodefs ||
3010             sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
3011                 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
3012                                sbi->s_inode_readahead_blks);
3013
3014         if (test_opt(sb, INIT_INODE_TABLE) && (nodefs ||
3015                        (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
3016                 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
3017         if (nodefs || sbi->s_max_dir_size_kb)
3018                 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
3019         if (test_opt(sb, DATA_ERR_ABORT))
3020                 SEQ_OPTS_PUTS("data_err=abort");
3021
3022         fscrypt_show_test_dummy_encryption(seq, sep, sb);
3023
3024         if (sb->s_flags & SB_INLINECRYPT)
3025                 SEQ_OPTS_PUTS("inlinecrypt");
3026
3027         if (test_opt(sb, DAX_ALWAYS)) {
3028                 if (IS_EXT2_SB(sb))
3029                         SEQ_OPTS_PUTS("dax");
3030                 else
3031                         SEQ_OPTS_PUTS("dax=always");
3032         } else if (test_opt2(sb, DAX_NEVER)) {
3033                 SEQ_OPTS_PUTS("dax=never");
3034         } else if (test_opt2(sb, DAX_INODE)) {
3035                 SEQ_OPTS_PUTS("dax=inode");
3036         }
3037
3038         if (sbi->s_groups_count >= MB_DEFAULT_LINEAR_SCAN_THRESHOLD &&
3039                         !test_opt2(sb, MB_OPTIMIZE_SCAN)) {
3040                 SEQ_OPTS_PUTS("mb_optimize_scan=0");
3041         } else if (sbi->s_groups_count < MB_DEFAULT_LINEAR_SCAN_THRESHOLD &&
3042                         test_opt2(sb, MB_OPTIMIZE_SCAN)) {
3043                 SEQ_OPTS_PUTS("mb_optimize_scan=1");
3044         }
3045
3046         ext4_show_quota_options(seq, sb);
3047         return 0;
3048 }
3049
3050 static int ext4_show_options(struct seq_file *seq, struct dentry *root)
3051 {
3052         return _ext4_show_options(seq, root->d_sb, 0);
3053 }
3054
3055 int ext4_seq_options_show(struct seq_file *seq, void *offset)
3056 {
3057         struct super_block *sb = seq->private;
3058         int rc;
3059
3060         seq_puts(seq, sb_rdonly(sb) ? "ro" : "rw");
3061         rc = _ext4_show_options(seq, sb, 1);
3062         seq_puts(seq, "\n");
3063         return rc;
3064 }
3065
3066 static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
3067                             int read_only)
3068 {
3069         struct ext4_sb_info *sbi = EXT4_SB(sb);
3070         int err = 0;
3071
3072         if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
3073                 ext4_msg(sb, KERN_ERR, "revision level too high, "
3074                          "forcing read-only mode");
3075                 err = -EROFS;
3076                 goto done;
3077         }
3078         if (read_only)
3079                 goto done;
3080         if (!(sbi->s_mount_state & EXT4_VALID_FS))
3081                 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
3082                          "running e2fsck is recommended");
3083         else if (sbi->s_mount_state & EXT4_ERROR_FS)
3084                 ext4_msg(sb, KERN_WARNING,
3085                          "warning: mounting fs with errors, "
3086                          "running e2fsck is recommended");
3087         else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
3088                  le16_to_cpu(es->s_mnt_count) >=
3089                  (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
3090                 ext4_msg(sb, KERN_WARNING,
3091                          "warning: maximal mount count reached, "
3092                          "running e2fsck is recommended");
3093         else if (le32_to_cpu(es->s_checkinterval) &&
3094                  (ext4_get_tstamp(es, s_lastcheck) +
3095                   le32_to_cpu(es->s_checkinterval) <= ktime_get_real_seconds()))
3096                 ext4_msg(sb, KERN_WARNING,
3097                          "warning: checktime reached, "
3098                          "running e2fsck is recommended");
3099         if (!sbi->s_journal)
3100                 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
3101         if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
3102                 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
3103         le16_add_cpu(&es->s_mnt_count, 1);
3104         ext4_update_tstamp(es, s_mtime);
3105         if (sbi->s_journal) {
3106                 ext4_set_feature_journal_needs_recovery(sb);
3107                 if (ext4_has_feature_orphan_file(sb))
3108                         ext4_set_feature_orphan_present(sb);
3109         }
3110
3111         err = ext4_commit_super(sb);
3112 done:
3113         if (test_opt(sb, DEBUG))
3114                 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
3115                                 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
3116                         sb->s_blocksize,
3117                         sbi->s_groups_count,
3118                         EXT4_BLOCKS_PER_GROUP(sb),
3119                         EXT4_INODES_PER_GROUP(sb),
3120                         sbi->s_mount_opt, sbi->s_mount_opt2);
3121         return err;
3122 }
3123
3124 int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup)
3125 {
3126         struct ext4_sb_info *sbi = EXT4_SB(sb);
3127         struct flex_groups **old_groups, **new_groups;
3128         int size, i, j;
3129
3130         if (!sbi->s_log_groups_per_flex)
3131                 return 0;
3132
3133         size = ext4_flex_group(sbi, ngroup - 1) + 1;
3134         if (size <= sbi->s_flex_groups_allocated)
3135                 return 0;
3136
3137         new_groups = kvzalloc(roundup_pow_of_two(size *
3138                               sizeof(*sbi->s_flex_groups)), GFP_KERNEL);
3139         if (!new_groups) {
3140                 ext4_msg(sb, KERN_ERR,
3141                          "not enough memory for %d flex group pointers", size);
3142                 return -ENOMEM;
3143         }
3144         for (i = sbi->s_flex_groups_allocated; i < size; i++) {
3145                 new_groups[i] = kvzalloc(roundup_pow_of_two(
3146                                          sizeof(struct flex_groups)),
3147                                          GFP_KERNEL);
3148                 if (!new_groups[i]) {
3149                         for (j = sbi->s_flex_groups_allocated; j < i; j++)
3150                                 kvfree(new_groups[j]);
3151                         kvfree(new_groups);
3152                         ext4_msg(sb, KERN_ERR,
3153                                  "not enough memory for %d flex groups", size);
3154                         return -ENOMEM;
3155                 }
3156         }
3157         rcu_read_lock();
3158         old_groups = rcu_dereference(sbi->s_flex_groups);
3159         if (old_groups)
3160                 memcpy(new_groups, old_groups,
3161                        (sbi->s_flex_groups_allocated *
3162                         sizeof(struct flex_groups *)));
3163         rcu_read_unlock();
3164         rcu_assign_pointer(sbi->s_flex_groups, new_groups);
3165         sbi->s_flex_groups_allocated = size;
3166         if (old_groups)
3167                 ext4_kvfree_array_rcu(old_groups);
3168         return 0;
3169 }
3170
3171 static int ext4_fill_flex_info(struct super_block *sb)
3172 {
3173         struct ext4_sb_info *sbi = EXT4_SB(sb);
3174         struct ext4_group_desc *gdp = NULL;
3175         struct flex_groups *fg;
3176         ext4_group_t flex_group;
3177         int i, err;
3178
3179         sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
3180         if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
3181                 sbi->s_log_groups_per_flex = 0;
3182                 return 1;
3183         }
3184
3185         err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
3186         if (err)
3187                 goto failed;
3188
3189         for (i = 0; i < sbi->s_groups_count; i++) {
3190                 gdp = ext4_get_group_desc(sb, i, NULL);
3191
3192                 flex_group = ext4_flex_group(sbi, i);
3193                 fg = sbi_array_rcu_deref(sbi, s_flex_groups, flex_group);
3194                 atomic_add(ext4_free_inodes_count(sb, gdp), &fg->free_inodes);
3195                 atomic64_add(ext4_free_group_clusters(sb, gdp),
3196                              &fg->free_clusters);
3197                 atomic_add(ext4_used_dirs_count(sb, gdp), &fg->used_dirs);
3198         }
3199
3200         return 1;
3201 failed:
3202         return 0;
3203 }
3204
3205 static __le16 ext4_group_desc_csum(struct super_block *sb, __u32 block_group,
3206                                    struct ext4_group_desc *gdp)
3207 {
3208         int offset = offsetof(struct ext4_group_desc, bg_checksum);
3209         __u16 crc = 0;
3210         __le32 le_group = cpu_to_le32(block_group);
3211         struct ext4_sb_info *sbi = EXT4_SB(sb);
3212
3213         if (ext4_has_metadata_csum(sbi->s_sb)) {
3214                 /* Use new metadata_csum algorithm */
3215                 __u32 csum32;
3216                 __u16 dummy_csum = 0;
3217
3218                 csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
3219                                      sizeof(le_group));
3220                 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp, offset);
3221                 csum32 = ext4_chksum(sbi, csum32, (__u8 *)&dummy_csum,
3222                                      sizeof(dummy_csum));
3223                 offset += sizeof(dummy_csum);
3224                 if (offset < sbi->s_desc_size)
3225                         csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp + offset,
3226                                              sbi->s_desc_size - offset);
3227
3228                 crc = csum32 & 0xFFFF;
3229                 goto out;
3230         }
3231
3232         /* old crc16 code */
3233         if (!ext4_has_feature_gdt_csum(sb))
3234                 return 0;
3235
3236         crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
3237         crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
3238         crc = crc16(crc, (__u8 *)gdp, offset);
3239         offset += sizeof(gdp->bg_checksum); /* skip checksum */
3240         /* for checksum of struct ext4_group_desc do the rest...*/
3241         if (ext4_has_feature_64bit(sb) && offset < sbi->s_desc_size)
3242                 crc = crc16(crc, (__u8 *)gdp + offset,
3243                             sbi->s_desc_size - offset);
3244
3245 out:
3246         return cpu_to_le16(crc);
3247 }
3248
3249 int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
3250                                 struct ext4_group_desc *gdp)
3251 {
3252         if (ext4_has_group_desc_csum(sb) &&
3253             (gdp->bg_checksum != ext4_group_desc_csum(sb, block_group, gdp)))
3254                 return 0;
3255
3256         return 1;
3257 }
3258
3259 void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group,
3260                               struct ext4_group_desc *gdp)
3261 {
3262         if (!ext4_has_group_desc_csum(sb))
3263                 return;
3264         gdp->bg_checksum = ext4_group_desc_csum(sb, block_group, gdp);
3265 }
3266
3267 /* Called at mount-time, super-block is locked */
3268 static int ext4_check_descriptors(struct super_block *sb,
3269                                   ext4_fsblk_t sb_block,
3270                                   ext4_group_t *first_not_zeroed)
3271 {
3272         struct ext4_sb_info *sbi = EXT4_SB(sb);
3273         ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
3274         ext4_fsblk_t last_block;
3275         ext4_fsblk_t last_bg_block = sb_block + ext4_bg_num_gdb(sb, 0);
3276         ext4_fsblk_t block_bitmap;
3277         ext4_fsblk_t inode_bitmap;
3278         ext4_fsblk_t inode_table;
3279         int flexbg_flag = 0;
3280         ext4_group_t i, grp = sbi->s_groups_count;
3281
3282         if (ext4_has_feature_flex_bg(sb))
3283                 flexbg_flag = 1;
3284
3285         ext4_debug("Checking group descriptors");
3286
3287         for (i = 0; i < sbi->s_groups_count; i++) {
3288                 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
3289
3290                 if (i == sbi->s_groups_count - 1 || flexbg_flag)
3291                         last_block = ext4_blocks_count(sbi->s_es) - 1;
3292                 else
3293                         last_block = first_block +
3294                                 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
3295
3296                 if ((grp == sbi->s_groups_count) &&
3297                    !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
3298                         grp = i;
3299
3300                 block_bitmap = ext4_block_bitmap(sb, gdp);
3301                 if (block_bitmap == sb_block) {
3302                         ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
3303                                  "Block bitmap for group %u overlaps "
3304                                  "superblock", i);
3305                         if (!sb_rdonly(sb))
3306                                 return 0;
3307                 }
3308                 if (block_bitmap >= sb_block + 1 &&
3309                     block_bitmap <= last_bg_block) {
3310                         ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
3311                                  "Block bitmap for group %u overlaps "
3312                                  "block group descriptors", i);
3313                         if (!sb_rdonly(sb))
3314                                 return 0;
3315                 }
3316                 if (block_bitmap < first_block || block_bitmap > last_block) {
3317                         ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
3318                                "Block bitmap for group %u not in group "
3319                                "(block %llu)!", i, block_bitmap);
3320                         return 0;
3321                 }
3322                 inode_bitmap = ext4_inode_bitmap(sb, gdp);
3323                 if (inode_bitmap == sb_block) {
3324                         ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
3325                                  "Inode bitmap for group %u overlaps "
3326                                  "superblock", i);
3327                         if (!sb_rdonly(sb))
3328                                 return 0;
3329                 }
3330                 if (inode_bitmap >= sb_block + 1 &&
3331                     inode_bitmap <= last_bg_block) {
3332                         ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
3333                                  "Inode bitmap for group %u overlaps "
3334                                  "block group descriptors", i);
3335                         if (!sb_rdonly(sb))
3336                                 return 0;
3337                 }
3338                 if (inode_bitmap < first_block || inode_bitmap > last_block) {
3339                         ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
3340                                "Inode bitmap for group %u not in group "
3341                                "(block %llu)!", i, inode_bitmap);
3342                         return 0;
3343                 }
3344                 inode_table = ext4_inode_table(sb, gdp);
3345                 if (inode_table == sb_block) {
3346                         ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
3347                                  "Inode table for group %u overlaps "
3348                                  "superblock", i);
3349                         if (!sb_rdonly(sb))
3350                                 return 0;
3351                 }
3352                 if (inode_table >= sb_block + 1 &&
3353                     inode_table <= last_bg_block) {
3354                         ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
3355                                  "Inode table for group %u overlaps "
3356                                  "block group descriptors", i);
3357                         if (!sb_rdonly(sb))
3358                                 return 0;
3359                 }
3360                 if (inode_table < first_block ||
3361                     inode_table + sbi->s_itb_per_group - 1 > last_block) {
3362                         ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
3363                                "Inode table for group %u not in group "
3364                                "(block %llu)!", i, inode_table);
3365                         return 0;
3366                 }
3367                 ext4_lock_group(sb, i);
3368                 if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
3369                         ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
3370                                  "Checksum for group %u failed (%u!=%u)",
3371                                  i, le16_to_cpu(ext4_group_desc_csum(sb, i,
3372                                      gdp)), le16_to_cpu(gdp->bg_checksum));
3373                         if (!sb_rdonly(sb)) {
3374                                 ext4_unlock_group(sb, i);
3375                                 return 0;
3376                         }
3377                 }
3378                 ext4_unlock_group(sb, i);
3379                 if (!flexbg_flag)
3380                         first_block += EXT4_BLOCKS_PER_GROUP(sb);
3381         }
3382         if (NULL != first_not_zeroed)
3383                 *first_not_zeroed = grp;
3384         return 1;
3385 }
3386
3387 /*
3388  * Maximal extent format file size.
3389  * Resulting logical blkno at s_maxbytes must fit in our on-disk
3390  * extent format containers, within a sector_t, and within i_blocks
3391  * in the vfs.  ext4 inode has 48 bits of i_block in fsblock units,
3392  * so that won't be a limiting factor.
3393  *
3394  * However there is other limiting factor. We do store extents in the form
3395  * of starting block and length, hence the resulting length of the extent
3396  * covering maximum file size must fit into on-disk format containers as
3397  * well. Given that length is always by 1 unit bigger than max unit (because
3398  * we count 0 as well) we have to lower the s_maxbytes by one fs block.
3399  *
3400  * Note, this does *not* consider any metadata overhead for vfs i_blocks.
3401  */
3402 static loff_t ext4_max_size(int blkbits, int has_huge_files)
3403 {
3404         loff_t res;
3405         loff_t upper_limit = MAX_LFS_FILESIZE;
3406
3407         BUILD_BUG_ON(sizeof(blkcnt_t) < sizeof(u64));
3408
3409         if (!has_huge_files) {
3410                 upper_limit = (1LL << 32) - 1;
3411
3412                 /* total blocks in file system block size */
3413                 upper_limit >>= (blkbits - 9);
3414                 upper_limit <<= blkbits;
3415         }
3416
3417         /*
3418          * 32-bit extent-start container, ee_block. We lower the maxbytes
3419          * by one fs block, so ee_len can cover the extent of maximum file
3420          * size
3421          */
3422         res = (1LL << 32) - 1;
3423         res <<= blkbits;
3424
3425         /* Sanity check against vm- & vfs- imposed limits */
3426         if (res > upper_limit)
3427                 res = upper_limit;
3428
3429         return res;
3430 }
3431
3432 /*
3433  * Maximal bitmap file size.  There is a direct, and {,double-,triple-}indirect
3434  * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
3435  * We need to be 1 filesystem block less than the 2^48 sector limit.
3436  */
3437 static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
3438 {
3439         loff_t upper_limit, res = EXT4_NDIR_BLOCKS;
3440         int meta_blocks;
3441         unsigned int ppb = 1 << (bits - 2);
3442
3443         /*
3444          * This is calculated to be the largest file size for a dense, block
3445          * mapped file such that the file's total number of 512-byte sectors,
3446          * including data and all indirect blocks, does not exceed (2^48 - 1).
3447          *
3448          * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
3449          * number of 512-byte sectors of the file.
3450          */
3451         if (!has_huge_files) {
3452                 /*
3453                  * !has_huge_files or implies that the inode i_block field
3454                  * represents total file blocks in 2^32 512-byte sectors ==
3455                  * size of vfs inode i_blocks * 8
3456                  */
3457                 upper_limit = (1LL << 32) - 1;
3458
3459                 /* total blocks in file system block size */
3460                 upper_limit >>= (bits - 9);
3461
3462         } else {
3463                 /*
3464                  * We use 48 bit ext4_inode i_blocks
3465                  * With EXT4_HUGE_FILE_FL set the i_blocks
3466                  * represent total number of blocks in
3467                  * file system block size
3468                  */
3469                 upper_limit = (1LL << 48) - 1;
3470
3471         }
3472
3473         /* Compute how many blocks we can address by block tree */
3474         res += ppb;
3475         res += ppb * ppb;
3476         res += ((loff_t)ppb) * ppb * ppb;
3477         /* Compute how many metadata blocks are needed */
3478         meta_blocks = 1;
3479         meta_blocks += 1 + ppb;
3480         meta_blocks += 1 + ppb + ppb * ppb;
3481         /* Does block tree limit file size? */
3482         if (res + meta_blocks <= upper_limit)
3483                 goto check_lfs;
3484
3485         res = upper_limit;
3486         /* How many metadata blocks are needed for addressing upper_limit? */
3487         upper_limit -= EXT4_NDIR_BLOCKS;
3488         /* indirect blocks */
3489         meta_blocks = 1;
3490         upper_limit -= ppb;
3491         /* double indirect blocks */
3492         if (upper_limit < ppb * ppb) {
3493                 meta_blocks += 1 + DIV_ROUND_UP_ULL(upper_limit, ppb);
3494                 res -= meta_blocks;
3495                 goto check_lfs;
3496         }
3497         meta_blocks += 1 + ppb;
3498         upper_limit -= ppb * ppb;
3499         /* tripple indirect blocks for the rest */
3500         meta_blocks += 1 + DIV_ROUND_UP_ULL(upper_limit, ppb) +
3501                 DIV_ROUND_UP_ULL(upper_limit, ppb*ppb);
3502         res -= meta_blocks;
3503 check_lfs:
3504         res <<= bits;
3505         if (res > MAX_LFS_FILESIZE)
3506                 res = MAX_LFS_FILESIZE;
3507
3508         return res;
3509 }
3510
3511 static ext4_fsblk_t descriptor_loc(struct super_block *sb,
3512                                    ext4_fsblk_t logical_sb_block, int nr)
3513 {
3514         struct ext4_sb_info *sbi = EXT4_SB(sb);
3515         ext4_group_t bg, first_meta_bg;
3516         int has_super = 0;
3517
3518         first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
3519
3520         if (!ext4_has_feature_meta_bg(sb) || nr < first_meta_bg)
3521                 return logical_sb_block + nr + 1;
3522         bg = sbi->s_desc_per_block * nr;
3523         if (ext4_bg_has_super(sb, bg))
3524                 has_super = 1;
3525
3526         /*
3527          * If we have a meta_bg fs with 1k blocks, group 0's GDT is at
3528          * block 2, not 1.  If s_first_data_block == 0 (bigalloc is enabled
3529          * on modern mke2fs or blksize > 1k on older mke2fs) then we must
3530          * compensate.
3531          */
3532         if (sb->s_blocksize == 1024 && nr == 0 &&
3533             le32_to_cpu(sbi->s_es->s_first_data_block) == 0)
3534                 has_super++;
3535
3536         return (has_super + ext4_group_first_block_no(sb, bg));
3537 }
3538
3539 /**
3540  * ext4_get_stripe_size: Get the stripe size.
3541  * @sbi: In memory super block info
3542  *
3543  * If we have specified it via mount option, then
3544  * use the mount option value. If the value specified at mount time is
3545  * greater than the blocks per group use the super block value.
3546  * If the super block value is greater than blocks per group return 0.
3547  * Allocator needs it be less than blocks per group.
3548  *
3549  */
3550 static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
3551 {
3552         unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
3553         unsigned long stripe_width =
3554                         le32_to_cpu(sbi->s_es->s_raid_stripe_width);
3555         int ret;
3556
3557         if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
3558                 ret = sbi->s_stripe;
3559         else if (stripe_width && stripe_width <= sbi->s_blocks_per_group)
3560                 ret = stripe_width;
3561         else if (stride && stride <= sbi->s_blocks_per_group)
3562                 ret = stride;
3563         else
3564                 ret = 0;
3565
3566         /*
3567          * If the stripe width is 1, this makes no sense and
3568          * we set it to 0 to turn off stripe handling code.
3569          */
3570         if (ret <= 1)
3571                 ret = 0;
3572
3573         return ret;
3574 }
3575
3576 /*
3577  * Check whether this filesystem can be mounted based on
3578  * the features present and the RDONLY/RDWR mount requested.
3579  * Returns 1 if this filesystem can be mounted as requested,
3580  * 0 if it cannot be.
3581  */
3582 int ext4_feature_set_ok(struct super_block *sb, int readonly)
3583 {
3584         if (ext4_has_unknown_ext4_incompat_features(sb)) {
3585                 ext4_msg(sb, KERN_ERR,
3586                         "Couldn't mount because of "
3587                         "unsupported optional features (%x)",
3588                         (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
3589                         ~EXT4_FEATURE_INCOMPAT_SUPP));
3590                 return 0;
3591         }
3592
3593 #if !IS_ENABLED(CONFIG_UNICODE)
3594         if (ext4_has_feature_casefold(sb)) {
3595                 ext4_msg(sb, KERN_ERR,
3596                          "Filesystem with casefold feature cannot be "
3597                          "mounted without CONFIG_UNICODE");
3598                 return 0;
3599         }
3600 #endif
3601
3602         if (readonly)
3603                 return 1;
3604
3605         if (ext4_has_feature_readonly(sb)) {
3606                 ext4_msg(sb, KERN_INFO, "filesystem is read-only");
3607                 sb->s_flags |= SB_RDONLY;
3608                 return 1;
3609         }
3610
3611         /* Check that feature set is OK for a read-write mount */
3612         if (ext4_has_unknown_ext4_ro_compat_features(sb)) {
3613                 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
3614                          "unsupported optional features (%x)",
3615                          (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
3616                                 ~EXT4_FEATURE_RO_COMPAT_SUPP));
3617                 return 0;
3618         }
3619         if (ext4_has_feature_bigalloc(sb) && !ext4_has_feature_extents(sb)) {
3620                 ext4_msg(sb, KERN_ERR,
3621                          "Can't support bigalloc feature without "
3622                          "extents feature\n");
3623                 return 0;
3624         }
3625
3626 #if !IS_ENABLED(CONFIG_QUOTA) || !IS_ENABLED(CONFIG_QFMT_V2)
3627         if (!readonly && (ext4_has_feature_quota(sb) ||
3628                           ext4_has_feature_project(sb))) {
3629                 ext4_msg(sb, KERN_ERR,
3630                          "The kernel was not built with CONFIG_QUOTA and CONFIG_QFMT_V2");
3631                 return 0;
3632         }
3633 #endif  /* CONFIG_QUOTA */
3634         return 1;
3635 }
3636
3637 /*
3638  * This function is called once a day if we have errors logged
3639  * on the file system
3640  */
3641 static void print_daily_error_info(struct timer_list *t)
3642 {
3643         struct ext4_sb_info *sbi = from_timer(sbi, t, s_err_report);
3644         struct super_block *sb = sbi->s_sb;
3645         struct ext4_super_block *es = sbi->s_es;
3646
3647         if (es->s_error_count)
3648                 /* fsck newer than v1.41.13 is needed to clean this condition. */
3649                 ext4_msg(sb, KERN_NOTICE, "error count since last fsck: %u",
3650                          le32_to_cpu(es->s_error_count));
3651         if (es->s_first_error_time) {
3652                 printk(KERN_NOTICE "EXT4-fs (%s): initial error at time %llu: %.*s:%d",
3653                        sb->s_id,
3654                        ext4_get_tstamp(es, s_first_error_time),
3655                        (int) sizeof(es->s_first_error_func),
3656                        es->s_first_error_func,
3657                        le32_to_cpu(es->s_first_error_line));
3658                 if (es->s_first_error_ino)
3659                         printk(KERN_CONT ": inode %u",
3660                                le32_to_cpu(es->s_first_error_ino));
3661                 if (es->s_first_error_block)
3662                         printk(KERN_CONT ": block %llu", (unsigned long long)
3663                                le64_to_cpu(es->s_first_error_block));
3664                 printk(KERN_CONT "\n");
3665         }
3666         if (es->s_last_error_time) {
3667                 printk(KERN_NOTICE "EXT4-fs (%s): last error at time %llu: %.*s:%d",
3668                        sb->s_id,
3669                        ext4_get_tstamp(es, s_last_error_time),
3670                        (int) sizeof(es->s_last_error_func),
3671                        es->s_last_error_func,
3672                        le32_to_cpu(es->s_last_error_line));
3673                 if (es->s_last_error_ino)
3674                         printk(KERN_CONT ": inode %u",
3675                                le32_to_cpu(es->s_last_error_ino));
3676                 if (es->s_last_error_block)
3677                         printk(KERN_CONT ": block %llu", (unsigned long long)
3678                                le64_to_cpu(es->s_last_error_block));
3679                 printk(KERN_CONT "\n");
3680         }
3681         mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ);  /* Once a day */
3682 }
3683
3684 /* Find next suitable group and run ext4_init_inode_table */
3685 static int ext4_run_li_request(struct ext4_li_request *elr)
3686 {
3687         struct ext4_group_desc *gdp = NULL;
3688         struct super_block *sb = elr->lr_super;
3689         ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
3690         ext4_group_t group = elr->lr_next_group;
3691         unsigned int prefetch_ios = 0;
3692         int ret = 0;
3693         int nr = EXT4_SB(sb)->s_mb_prefetch;
3694         u64 start_time;
3695
3696         if (elr->lr_mode == EXT4_LI_MODE_PREFETCH_BBITMAP) {
3697                 elr->lr_next_group = ext4_mb_prefetch(sb, group, nr, &prefetch_ios);
3698                 ext4_mb_prefetch_fini(sb, elr->lr_next_group, nr);
3699                 trace_ext4_prefetch_bitmaps(sb, group, elr->lr_next_group, nr);
3700                 if (group >= elr->lr_next_group) {
3701                         ret = 1;
3702                         if (elr->lr_first_not_zeroed != ngroups &&
3703                             !sb_rdonly(sb) && test_opt(sb, INIT_INODE_TABLE)) {
3704                                 elr->lr_next_group = elr->lr_first_not_zeroed;
3705                                 elr->lr_mode = EXT4_LI_MODE_ITABLE;
3706                                 ret = 0;
3707                         }
3708                 }
3709                 return ret;
3710         }
3711
3712         for (; group < ngroups; group++) {
3713                 gdp = ext4_get_group_desc(sb, group, NULL);
3714                 if (!gdp) {
3715                         ret = 1;
3716                         break;
3717                 }
3718
3719                 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
3720                         break;
3721         }
3722
3723         if (group >= ngroups)
3724                 ret = 1;
3725
3726         if (!ret) {
3727                 start_time = ktime_get_real_ns();
3728                 ret = ext4_init_inode_table(sb, group,
3729                                             elr->lr_timeout ? 0 : 1);
3730                 trace_ext4_lazy_itable_init(sb, group);
3731                 if (elr->lr_timeout == 0) {
3732                         elr->lr_timeout = nsecs_to_jiffies((ktime_get_real_ns() - start_time) *
3733                                 EXT4_SB(elr->lr_super)->s_li_wait_mult);
3734                 }
3735                 elr->lr_next_sched = jiffies + elr->lr_timeout;
3736                 elr->lr_next_group = group + 1;
3737         }
3738         return ret;
3739 }
3740
3741 /*
3742  * Remove lr_request from the list_request and free the
3743  * request structure. Should be called with li_list_mtx held
3744  */
3745 static void ext4_remove_li_request(struct ext4_li_request *elr)
3746 {
3747         if (!elr)
3748                 return;
3749
3750         list_del(&elr->lr_request);
3751         EXT4_SB(elr->lr_super)->s_li_request = NULL;
3752         kfree(elr);
3753 }
3754
3755 static void ext4_unregister_li_request(struct super_block *sb)
3756 {
3757         mutex_lock(&ext4_li_mtx);
3758         if (!ext4_li_info) {
3759                 mutex_unlock(&ext4_li_mtx);
3760                 return;
3761         }
3762
3763         mutex_lock(&ext4_li_info->li_list_mtx);
3764         ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
3765         mutex_unlock(&ext4_li_info->li_list_mtx);
3766         mutex_unlock(&ext4_li_mtx);
3767 }
3768
3769 static struct task_struct *ext4_lazyinit_task;
3770
3771 /*
3772  * This is the function where ext4lazyinit thread lives. It walks
3773  * through the request list searching for next scheduled filesystem.
3774  * When such a fs is found, run the lazy initialization request
3775  * (ext4_rn_li_request) and keep track of the time spend in this
3776  * function. Based on that time we compute next schedule time of
3777  * the request. When walking through the list is complete, compute
3778  * next waking time and put itself into sleep.
3779  */
3780 static int ext4_lazyinit_thread(void *arg)
3781 {
3782         struct ext4_lazy_init *eli = arg;
3783         struct list_head *pos, *n;
3784         struct ext4_li_request *elr;
3785         unsigned long next_wakeup, cur;
3786
3787         BUG_ON(NULL == eli);
3788         set_freezable();
3789
3790 cont_thread:
3791         while (true) {
3792                 next_wakeup = MAX_JIFFY_OFFSET;
3793
3794                 mutex_lock(&eli->li_list_mtx);
3795                 if (list_empty(&eli->li_request_list)) {
3796                         mutex_unlock(&eli->li_list_mtx);
3797                         goto exit_thread;
3798                 }
3799                 list_for_each_safe(pos, n, &eli->li_request_list) {
3800                         int err = 0;
3801                         int progress = 0;
3802                         elr = list_entry(pos, struct ext4_li_request,
3803                                          lr_request);
3804
3805                         if (time_before(jiffies, elr->lr_next_sched)) {
3806                                 if (time_before(elr->lr_next_sched, next_wakeup))
3807                                         next_wakeup = elr->lr_next_sched;
3808                                 continue;
3809                         }
3810                         if (down_read_trylock(&elr->lr_super->s_umount)) {
3811                                 if (sb_start_write_trylock(elr->lr_super)) {
3812                                         progress = 1;
3813                                         /*
3814                                          * We hold sb->s_umount, sb can not
3815                                          * be removed from the list, it is
3816                                          * now safe to drop li_list_mtx
3817                                          */
3818                                         mutex_unlock(&eli->li_list_mtx);
3819                                         err = ext4_run_li_request(elr);
3820                                         sb_end_write(elr->lr_super);
3821                                         mutex_lock(&eli->li_list_mtx);
3822                                         n = pos->next;
3823                                 }
3824                                 up_read((&elr->lr_super->s_umount));
3825                         }
3826                         /* error, remove the lazy_init job */
3827                         if (err) {
3828                                 ext4_remove_li_request(elr);
3829                                 continue;
3830                         }
3831                         if (!progress) {
3832                                 elr->lr_next_sched = jiffies +
3833                                         get_random_u32_below(EXT4_DEF_LI_MAX_START_DELAY * HZ);
3834                         }
3835                         if (time_before(elr->lr_next_sched, next_wakeup))
3836                                 next_wakeup = elr->lr_next_sched;
3837                 }
3838                 mutex_unlock(&eli->li_list_mtx);
3839
3840                 try_to_freeze();
3841
3842                 cur = jiffies;
3843                 if ((time_after_eq(cur, next_wakeup)) ||
3844                     (MAX_JIFFY_OFFSET == next_wakeup)) {
3845                         cond_resched();
3846                         continue;
3847                 }
3848
3849                 schedule_timeout_interruptible(next_wakeup - cur);
3850
3851                 if (kthread_should_stop()) {
3852                         ext4_clear_request_list();
3853                         goto exit_thread;
3854                 }
3855         }
3856
3857 exit_thread:
3858         /*
3859          * It looks like the request list is empty, but we need
3860          * to check it under the li_list_mtx lock, to prevent any
3861          * additions into it, and of course we should lock ext4_li_mtx
3862          * to atomically free the list and ext4_li_info, because at
3863          * this point another ext4 filesystem could be registering
3864          * new one.
3865          */
3866         mutex_lock(&ext4_li_mtx);
3867         mutex_lock(&eli->li_list_mtx);
3868         if (!list_empty(&eli->li_request_list)) {
3869                 mutex_unlock(&eli->li_list_mtx);
3870                 mutex_unlock(&ext4_li_mtx);
3871                 goto cont_thread;
3872         }
3873         mutex_unlock(&eli->li_list_mtx);
3874         kfree(ext4_li_info);
3875         ext4_li_info = NULL;
3876         mutex_unlock(&ext4_li_mtx);
3877
3878         return 0;
3879 }
3880
3881 static void ext4_clear_request_list(void)
3882 {
3883         struct list_head *pos, *n;
3884         struct ext4_li_request *elr;
3885
3886         mutex_lock(&ext4_li_info->li_list_mtx);
3887         list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
3888                 elr = list_entry(pos, struct ext4_li_request,
3889                                  lr_request);
3890                 ext4_remove_li_request(elr);
3891         }
3892         mutex_unlock(&ext4_li_info->li_list_mtx);
3893 }
3894
3895 static int ext4_run_lazyinit_thread(void)
3896 {
3897         ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
3898                                          ext4_li_info, "ext4lazyinit");
3899         if (IS_ERR(ext4_lazyinit_task)) {
3900                 int err = PTR_ERR(ext4_lazyinit_task);
3901                 ext4_clear_request_list();
3902                 kfree(ext4_li_info);
3903                 ext4_li_info = NULL;
3904                 printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
3905                                  "initialization thread\n",
3906                                  err);
3907                 return err;
3908         }
3909         ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
3910         return 0;
3911 }
3912
3913 /*
3914  * Check whether it make sense to run itable init. thread or not.
3915  * If there is at least one uninitialized inode table, return
3916  * corresponding group number, else the loop goes through all
3917  * groups and return total number of groups.
3918  */
3919 static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
3920 {
3921         ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
3922         struct ext4_group_desc *gdp = NULL;
3923
3924         if (!ext4_has_group_desc_csum(sb))
3925                 return ngroups;
3926
3927         for (group = 0; group < ngroups; group++) {
3928                 gdp = ext4_get_group_desc(sb, group, NULL);
3929                 if (!gdp)
3930                         continue;
3931
3932                 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
3933                         break;
3934         }
3935
3936         return group;
3937 }
3938
3939 static int ext4_li_info_new(void)
3940 {
3941         struct ext4_lazy_init *eli = NULL;
3942
3943         eli = kzalloc(sizeof(*eli), GFP_KERNEL);
3944         if (!eli)
3945                 return -ENOMEM;
3946
3947         INIT_LIST_HEAD(&eli->li_request_list);
3948         mutex_init(&eli->li_list_mtx);
3949
3950         eli->li_state |= EXT4_LAZYINIT_QUIT;
3951
3952         ext4_li_info = eli;
3953
3954         return 0;
3955 }
3956
3957 static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
3958                                             ext4_group_t start)
3959 {
3960         struct ext4_li_request *elr;
3961
3962         elr = kzalloc(sizeof(*elr), GFP_KERNEL);
3963         if (!elr)
3964                 return NULL;
3965
3966         elr->lr_super = sb;
3967         elr->lr_first_not_zeroed = start;
3968         if (test_opt(sb, NO_PREFETCH_BLOCK_BITMAPS)) {
3969                 elr->lr_mode = EXT4_LI_MODE_ITABLE;
3970                 elr->lr_next_group = start;
3971         } else {
3972                 elr->lr_mode = EXT4_LI_MODE_PREFETCH_BBITMAP;
3973         }
3974
3975         /*
3976          * Randomize first schedule time of the request to
3977          * spread the inode table initialization requests
3978          * better.
3979          */
3980         elr->lr_next_sched = jiffies + get_random_u32_below(EXT4_DEF_LI_MAX_START_DELAY * HZ);
3981         return elr;
3982 }
3983
3984 int ext4_register_li_request(struct super_block *sb,
3985                              ext4_group_t first_not_zeroed)
3986 {
3987         struct ext4_sb_info *sbi = EXT4_SB(sb);
3988         struct ext4_li_request *elr = NULL;
3989         ext4_group_t ngroups = sbi->s_groups_count;
3990         int ret = 0;
3991
3992         mutex_lock(&ext4_li_mtx);
3993         if (sbi->s_li_request != NULL) {
3994                 /*
3995                  * Reset timeout so it can be computed again, because
3996                  * s_li_wait_mult might have changed.
3997                  */
3998                 sbi->s_li_request->lr_timeout = 0;
3999                 goto out;
4000         }
4001
4002         if (sb_rdonly(sb) ||
4003             (test_opt(sb, NO_PREFETCH_BLOCK_BITMAPS) &&
4004              (first_not_zeroed == ngroups || !test_opt(sb, INIT_INODE_TABLE))))
4005                 goto out;
4006
4007         elr = ext4_li_request_new(sb, first_not_zeroed);
4008         if (!elr) {
4009                 ret = -ENOMEM;
4010                 goto out;
4011         }
4012
4013         if (NULL == ext4_li_info) {
4014                 ret = ext4_li_info_new();
4015                 if (ret)
4016                         goto out;
4017         }
4018
4019         mutex_lock(&ext4_li_info->li_list_mtx);
4020         list_add(&elr->lr_request, &ext4_li_info->li_request_list);
4021         mutex_unlock(&ext4_li_info->li_list_mtx);
4022
4023         sbi->s_li_request = elr;
4024         /*
4025          * set elr to NULL here since it has been inserted to
4026          * the request_list and the removal and free of it is
4027          * handled by ext4_clear_request_list from now on.
4028          */
4029         elr = NULL;
4030
4031         if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
4032                 ret = ext4_run_lazyinit_thread();
4033                 if (ret)
4034                         goto out;
4035         }
4036 out:
4037         mutex_unlock(&ext4_li_mtx);
4038         if (ret)
4039                 kfree(elr);
4040         return ret;
4041 }
4042
4043 /*
4044  * We do not need to lock anything since this is called on
4045  * module unload.
4046  */
4047 static void ext4_destroy_lazyinit_thread(void)
4048 {
4049         /*
4050          * If thread exited earlier
4051          * there's nothing to be done.
4052          */
4053         if (!ext4_li_info || !ext4_lazyinit_task)
4054                 return;
4055
4056         kthread_stop(ext4_lazyinit_task);
4057 }
4058
4059 static int set_journal_csum_feature_set(struct super_block *sb)
4060 {
4061         int ret = 1;
4062         int compat, incompat;
4063         struct ext4_sb_info *sbi = EXT4_SB(sb);
4064
4065         if (ext4_has_metadata_csum(sb)) {
4066                 /* journal checksum v3 */
4067                 compat = 0;
4068                 incompat = JBD2_FEATURE_INCOMPAT_CSUM_V3;
4069         } else {
4070                 /* journal checksum v1 */
4071                 compat = JBD2_FEATURE_COMPAT_CHECKSUM;
4072                 incompat = 0;
4073         }
4074
4075         jbd2_journal_clear_features(sbi->s_journal,
4076                         JBD2_FEATURE_COMPAT_CHECKSUM, 0,
4077                         JBD2_FEATURE_INCOMPAT_CSUM_V3 |
4078                         JBD2_FEATURE_INCOMPAT_CSUM_V2);
4079         if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
4080                 ret = jbd2_journal_set_features(sbi->s_journal,
4081                                 compat, 0,
4082                                 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
4083                                 incompat);
4084         } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
4085                 ret = jbd2_journal_set_features(sbi->s_journal,
4086                                 compat, 0,
4087                                 incompat);
4088                 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
4089                                 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
4090         } else {
4091                 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
4092                                 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
4093         }
4094
4095         return ret;
4096 }
4097
4098 /*
4099  * Note: calculating the overhead so we can be compatible with
4100  * historical BSD practice is quite difficult in the face of
4101  * clusters/bigalloc.  This is because multiple metadata blocks from
4102  * different block group can end up in the same allocation cluster.
4103  * Calculating the exact overhead in the face of clustered allocation
4104  * requires either O(all block bitmaps) in memory or O(number of block
4105  * groups**2) in time.  We will still calculate the superblock for
4106  * older file systems --- and if we come across with a bigalloc file
4107  * system with zero in s_overhead_clusters the estimate will be close to
4108  * correct especially for very large cluster sizes --- but for newer
4109  * file systems, it's better to calculate this figure once at mkfs
4110  * time, and store it in the superblock.  If the superblock value is
4111  * present (even for non-bigalloc file systems), we will use it.
4112  */
4113 static int count_overhead(struct super_block *sb, ext4_group_t grp,
4114                           char *buf)
4115 {
4116         struct ext4_sb_info     *sbi = EXT4_SB(sb);
4117         struct ext4_group_desc  *gdp;
4118         ext4_fsblk_t            first_block, last_block, b;
4119         ext4_group_t            i, ngroups = ext4_get_groups_count(sb);
4120         int                     s, j, count = 0;
4121         int                     has_super = ext4_bg_has_super(sb, grp);
4122
4123         if (!ext4_has_feature_bigalloc(sb))
4124                 return (has_super + ext4_bg_num_gdb(sb, grp) +
4125                         (has_super ? le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) : 0) +
4126                         sbi->s_itb_per_group + 2);
4127
4128         first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
4129                 (grp * EXT4_BLOCKS_PER_GROUP(sb));
4130         last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
4131         for (i = 0; i < ngroups; i++) {
4132                 gdp = ext4_get_group_desc(sb, i, NULL);
4133                 b = ext4_block_bitmap(sb, gdp);
4134                 if (b >= first_block && b <= last_block) {
4135                         ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
4136                         count++;
4137                 }
4138                 b = ext4_inode_bitmap(sb, gdp);
4139                 if (b >= first_block && b <= last_block) {
4140                         ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
4141                         count++;
4142                 }
4143                 b = ext4_inode_table(sb, gdp);
4144                 if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
4145                         for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
4146                                 int c = EXT4_B2C(sbi, b - first_block);
4147                                 ext4_set_bit(c, buf);
4148                                 count++;
4149                         }
4150                 if (i != grp)
4151                         continue;
4152                 s = 0;
4153                 if (ext4_bg_has_super(sb, grp)) {
4154                         ext4_set_bit(s++, buf);
4155                         count++;
4156                 }
4157                 j = ext4_bg_num_gdb(sb, grp);
4158                 if (s + j > EXT4_BLOCKS_PER_GROUP(sb)) {
4159                         ext4_error(sb, "Invalid number of block group "
4160                                    "descriptor blocks: %d", j);
4161                         j = EXT4_BLOCKS_PER_GROUP(sb) - s;
4162                 }
4163                 count += j;
4164                 for (; j > 0; j--)
4165                         ext4_set_bit(EXT4_B2C(sbi, s++), buf);
4166         }
4167         if (!count)
4168                 return 0;
4169         return EXT4_CLUSTERS_PER_GROUP(sb) -
4170                 ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
4171 }
4172
4173 /*
4174  * Compute the overhead and stash it in sbi->s_overhead
4175  */
4176 int ext4_calculate_overhead(struct super_block *sb)
4177 {
4178         struct ext4_sb_info *sbi = EXT4_SB(sb);
4179         struct ext4_super_block *es = sbi->s_es;
4180         struct inode *j_inode;
4181         unsigned int j_blocks, j_inum = le32_to_cpu(es->s_journal_inum);
4182         ext4_group_t i, ngroups = ext4_get_groups_count(sb);
4183         ext4_fsblk_t overhead = 0;
4184         char *buf = (char *) get_zeroed_page(GFP_NOFS);
4185
4186         if (!buf)
4187                 return -ENOMEM;
4188
4189         /*
4190          * Compute the overhead (FS structures).  This is constant
4191          * for a given filesystem unless the number of block groups
4192          * changes so we cache the previous value until it does.
4193          */
4194
4195         /*
4196          * All of the blocks before first_data_block are overhead
4197          */
4198         overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
4199
4200         /*
4201          * Add the overhead found in each block group
4202          */
4203         for (i = 0; i < ngroups; i++) {
4204                 int blks;
4205
4206                 blks = count_overhead(sb, i, buf);
4207                 overhead += blks;
4208                 if (blks)
4209                         memset(buf, 0, PAGE_SIZE);
4210                 cond_resched();
4211         }
4212
4213         /*
4214          * Add the internal journal blocks whether the journal has been
4215          * loaded or not
4216          */
4217         if (sbi->s_journal && !sbi->s_journal_bdev)
4218                 overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_total_len);
4219         else if (ext4_has_feature_journal(sb) && !sbi->s_journal && j_inum) {
4220                 /* j_inum for internal journal is non-zero */
4221                 j_inode = ext4_get_journal_inode(sb, j_inum);
4222                 if (j_inode) {
4223                         j_blocks = j_inode->i_size >> sb->s_blocksize_bits;
4224                         overhead += EXT4_NUM_B2C(sbi, j_blocks);
4225                         iput(j_inode);
4226                 } else {
4227                         ext4_msg(sb, KERN_ERR, "can't get journal size");
4228                 }
4229         }
4230         sbi->s_overhead = overhead;
4231         smp_wmb();
4232         free_page((unsigned long) buf);
4233         return 0;
4234 }
4235
4236 static void ext4_set_resv_clusters(struct super_block *sb)
4237 {
4238         ext4_fsblk_t resv_clusters;
4239         struct ext4_sb_info *sbi = EXT4_SB(sb);
4240
4241         /*
4242          * There's no need to reserve anything when we aren't using extents.
4243          * The space estimates are exact, there are no unwritten extents,
4244          * hole punching doesn't need new metadata... This is needed especially
4245          * to keep ext2/3 backward compatibility.
4246          */
4247         if (!ext4_has_feature_extents(sb))
4248                 return;
4249         /*
4250          * By default we reserve 2% or 4096 clusters, whichever is smaller.
4251          * This should cover the situations where we can not afford to run
4252          * out of space like for example punch hole, or converting
4253          * unwritten extents in delalloc path. In most cases such
4254          * allocation would require 1, or 2 blocks, higher numbers are
4255          * very rare.
4256          */
4257         resv_clusters = (ext4_blocks_count(sbi->s_es) >>
4258                          sbi->s_cluster_bits);
4259
4260         do_div(resv_clusters, 50);
4261         resv_clusters = min_t(ext4_fsblk_t, resv_clusters, 4096);
4262
4263         atomic64_set(&sbi->s_resv_clusters, resv_clusters);
4264 }
4265
4266 static const char *ext4_quota_mode(struct super_block *sb)
4267 {
4268 #ifdef CONFIG_QUOTA
4269         if (!ext4_quota_capable(sb))
4270                 return "none";
4271
4272         if (EXT4_SB(sb)->s_journal && ext4_is_quota_journalled(sb))
4273                 return "journalled";
4274         else
4275                 return "writeback";
4276 #else
4277         return "disabled";
4278 #endif
4279 }
4280
4281 static void ext4_setup_csum_trigger(struct super_block *sb,
4282                                     enum ext4_journal_trigger_type type,
4283                                     void (*trigger)(
4284                                         struct jbd2_buffer_trigger_type *type,
4285                                         struct buffer_head *bh,
4286                                         void *mapped_data,
4287                                         size_t size))
4288 {
4289         struct ext4_sb_info *sbi = EXT4_SB(sb);
4290
4291         sbi->s_journal_triggers[type].sb = sb;
4292         sbi->s_journal_triggers[type].tr_triggers.t_frozen = trigger;
4293 }
4294
4295 static void ext4_free_sbi(struct ext4_sb_info *sbi)
4296 {
4297         if (!sbi)
4298                 return;
4299
4300         kfree(sbi->s_blockgroup_lock);
4301         fs_put_dax(sbi->s_daxdev, NULL);
4302         kfree(sbi);
4303 }
4304
4305 static struct ext4_sb_info *ext4_alloc_sbi(struct super_block *sb)
4306 {
4307         struct ext4_sb_info *sbi;
4308
4309         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
4310         if (!sbi)
4311                 return NULL;
4312
4313         sbi->s_daxdev = fs_dax_get_by_bdev(sb->s_bdev, &sbi->s_dax_part_off,
4314                                            NULL, NULL);
4315
4316         sbi->s_blockgroup_lock =
4317                 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
4318
4319         if (!sbi->s_blockgroup_lock)
4320                 goto err_out;
4321
4322         sb->s_fs_info = sbi;
4323         sbi->s_sb = sb;
4324         return sbi;
4325 err_out:
4326         fs_put_dax(sbi->s_daxdev, NULL);
4327         kfree(sbi);
4328         return NULL;
4329 }
4330
4331 static void ext4_set_def_opts(struct super_block *sb,
4332                               struct ext4_super_block *es)
4333 {
4334         unsigned long def_mount_opts;
4335
4336         /* Set defaults before we parse the mount options */
4337         def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
4338         set_opt(sb, INIT_INODE_TABLE);
4339         if (def_mount_opts & EXT4_DEFM_DEBUG)
4340                 set_opt(sb, DEBUG);
4341         if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
4342                 set_opt(sb, GRPID);
4343         if (def_mount_opts & EXT4_DEFM_UID16)
4344                 set_opt(sb, NO_UID32);
4345         /* xattr user namespace & acls are now defaulted on */
4346         set_opt(sb, XATTR_USER);
4347 #ifdef CONFIG_EXT4_FS_POSIX_ACL
4348         set_opt(sb, POSIX_ACL);
4349 #endif
4350         if (ext4_has_feature_fast_commit(sb))
4351                 set_opt2(sb, JOURNAL_FAST_COMMIT);
4352         /* don't forget to enable journal_csum when metadata_csum is enabled. */
4353         if (ext4_has_metadata_csum(sb))
4354                 set_opt(sb, JOURNAL_CHECKSUM);
4355
4356         if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
4357                 set_opt(sb, JOURNAL_DATA);
4358         else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
4359                 set_opt(sb, ORDERED_DATA);
4360         else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
4361                 set_opt(sb, WRITEBACK_DATA);
4362
4363         if (le16_to_cpu(es->s_errors) == EXT4_ERRORS_PANIC)
4364                 set_opt(sb, ERRORS_PANIC);
4365         else if (le16_to_cpu(es->s_errors) == EXT4_ERRORS_CONTINUE)
4366                 set_opt(sb, ERRORS_CONT);
4367         else
4368                 set_opt(sb, ERRORS_RO);
4369         /* block_validity enabled by default; disable with noblock_validity */
4370         set_opt(sb, BLOCK_VALIDITY);
4371         if (def_mount_opts & EXT4_DEFM_DISCARD)
4372                 set_opt(sb, DISCARD);
4373
4374         if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
4375                 set_opt(sb, BARRIER);
4376
4377         /*
4378          * enable delayed allocation by default
4379          * Use -o nodelalloc to turn it off
4380          */
4381         if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
4382             ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
4383                 set_opt(sb, DELALLOC);
4384
4385         if (sb->s_blocksize == PAGE_SIZE)
4386                 set_opt(sb, DIOREAD_NOLOCK);
4387 }
4388
4389 static int ext4_handle_clustersize(struct super_block *sb)
4390 {
4391         struct ext4_sb_info *sbi = EXT4_SB(sb);
4392         struct ext4_super_block *es = sbi->s_es;
4393         int clustersize;
4394
4395         /* Handle clustersize */
4396         clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
4397         if (ext4_has_feature_bigalloc(sb)) {
4398                 if (clustersize < sb->s_blocksize) {
4399                         ext4_msg(sb, KERN_ERR,
4400                                  "cluster size (%d) smaller than "
4401                                  "block size (%lu)", clustersize, sb->s_blocksize);
4402                         return -EINVAL;
4403                 }
4404                 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
4405                         le32_to_cpu(es->s_log_block_size);
4406                 sbi->s_clusters_per_group =
4407                         le32_to_cpu(es->s_clusters_per_group);
4408                 if (sbi->s_clusters_per_group > sb->s_blocksize * 8) {
4409                         ext4_msg(sb, KERN_ERR,
4410                                  "#clusters per group too big: %lu",
4411                                  sbi->s_clusters_per_group);
4412                         return -EINVAL;
4413                 }
4414                 if (sbi->s_blocks_per_group !=
4415                     (sbi->s_clusters_per_group * (clustersize / sb->s_blocksize))) {
4416                         ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
4417                                  "clusters per group (%lu) inconsistent",
4418                                  sbi->s_blocks_per_group,
4419                                  sbi->s_clusters_per_group);
4420                         return -EINVAL;
4421                 }
4422         } else {
4423                 if (clustersize != sb->s_blocksize) {
4424                         ext4_msg(sb, KERN_ERR,
4425                                  "fragment/cluster size (%d) != "
4426                                  "block size (%lu)", clustersize, sb->s_blocksize);
4427                         return -EINVAL;
4428                 }
4429                 if (sbi->s_blocks_per_group > sb->s_blocksize * 8) {
4430                         ext4_msg(sb, KERN_ERR,
4431                                  "#blocks per group too big: %lu",
4432                                  sbi->s_blocks_per_group);
4433                         return -EINVAL;
4434                 }
4435                 sbi->s_clusters_per_group = sbi->s_blocks_per_group;
4436                 sbi->s_cluster_bits = 0;
4437         }
4438         sbi->s_cluster_ratio = clustersize / sb->s_blocksize;
4439
4440         /* Do we have standard group size of clustersize * 8 blocks ? */
4441         if (sbi->s_blocks_per_group == clustersize << 3)
4442                 set_opt2(sb, STD_GROUP_SIZE);
4443
4444         return 0;
4445 }
4446
4447 static void ext4_fast_commit_init(struct super_block *sb)
4448 {
4449         struct ext4_sb_info *sbi = EXT4_SB(sb);
4450
4451         /* Initialize fast commit stuff */
4452         atomic_set(&sbi->s_fc_subtid, 0);
4453         INIT_LIST_HEAD(&sbi->s_fc_q[FC_Q_MAIN]);
4454         INIT_LIST_HEAD(&sbi->s_fc_q[FC_Q_STAGING]);
4455         INIT_LIST_HEAD(&sbi->s_fc_dentry_q[FC_Q_MAIN]);
4456         INIT_LIST_HEAD(&sbi->s_fc_dentry_q[FC_Q_STAGING]);
4457         sbi->s_fc_bytes = 0;
4458         ext4_clear_mount_flag(sb, EXT4_MF_FC_INELIGIBLE);
4459         sbi->s_fc_ineligible_tid = 0;
4460         spin_lock_init(&sbi->s_fc_lock);
4461         memset(&sbi->s_fc_stats, 0, sizeof(sbi->s_fc_stats));
4462         sbi->s_fc_replay_state.fc_regions = NULL;
4463         sbi->s_fc_replay_state.fc_regions_size = 0;
4464         sbi->s_fc_replay_state.fc_regions_used = 0;
4465         sbi->s_fc_replay_state.fc_regions_valid = 0;
4466         sbi->s_fc_replay_state.fc_modified_inodes = NULL;
4467         sbi->s_fc_replay_state.fc_modified_inodes_size = 0;
4468         sbi->s_fc_replay_state.fc_modified_inodes_used = 0;
4469 }
4470
4471 static int ext4_inode_info_init(struct super_block *sb,
4472                                 struct ext4_super_block *es)
4473 {
4474         struct ext4_sb_info *sbi = EXT4_SB(sb);
4475
4476         if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
4477                 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
4478                 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
4479         } else {
4480                 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
4481                 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
4482                 if (sbi->s_first_ino < EXT4_GOOD_OLD_FIRST_INO) {
4483                         ext4_msg(sb, KERN_ERR, "invalid first ino: %u",
4484                                  sbi->s_first_ino);
4485                         return -EINVAL;
4486                 }
4487                 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
4488                     (!is_power_of_2(sbi->s_inode_size)) ||
4489                     (sbi->s_inode_size > sb->s_blocksize)) {
4490                         ext4_msg(sb, KERN_ERR,
4491                                "unsupported inode size: %d",
4492                                sbi->s_inode_size);
4493                         ext4_msg(sb, KERN_ERR, "blocksize: %lu", sb->s_blocksize);
4494                         return -EINVAL;
4495                 }
4496                 /*
4497                  * i_atime_extra is the last extra field available for
4498                  * [acm]times in struct ext4_inode. Checking for that
4499                  * field should suffice to ensure we have extra space
4500                  * for all three.
4501                  */
4502                 if (sbi->s_inode_size >= offsetof(struct ext4_inode, i_atime_extra) +
4503                         sizeof(((struct ext4_inode *)0)->i_atime_extra)) {
4504                         sb->s_time_gran = 1;
4505                         sb->s_time_max = EXT4_EXTRA_TIMESTAMP_MAX;
4506                 } else {
4507                         sb->s_time_gran = NSEC_PER_SEC;
4508                         sb->s_time_max = EXT4_NON_EXTRA_TIMESTAMP_MAX;
4509                 }
4510                 sb->s_time_min = EXT4_TIMESTAMP_MIN;
4511         }
4512
4513         if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
4514                 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
4515                         EXT4_GOOD_OLD_INODE_SIZE;
4516                 if (ext4_has_feature_extra_isize(sb)) {
4517                         unsigned v, max = (sbi->s_inode_size -
4518                                            EXT4_GOOD_OLD_INODE_SIZE);
4519
4520                         v = le16_to_cpu(es->s_want_extra_isize);
4521                         if (v > max) {
4522                                 ext4_msg(sb, KERN_ERR,
4523                                          "bad s_want_extra_isize: %d", v);
4524                                 return -EINVAL;
4525                         }
4526                         if (sbi->s_want_extra_isize < v)
4527                                 sbi->s_want_extra_isize = v;
4528
4529                         v = le16_to_cpu(es->s_min_extra_isize);
4530                         if (v > max) {
4531                                 ext4_msg(sb, KERN_ERR,
4532                                          "bad s_min_extra_isize: %d", v);
4533                                 return -EINVAL;
4534                         }
4535                         if (sbi->s_want_extra_isize < v)
4536                                 sbi->s_want_extra_isize = v;
4537                 }
4538         }
4539
4540         return 0;
4541 }
4542
4543 #if IS_ENABLED(CONFIG_UNICODE)
4544 static int ext4_encoding_init(struct super_block *sb, struct ext4_super_block *es)
4545 {
4546         const struct ext4_sb_encodings *encoding_info;
4547         struct unicode_map *encoding;
4548         __u16 encoding_flags = le16_to_cpu(es->s_encoding_flags);
4549
4550         if (!ext4_has_feature_casefold(sb) || sb->s_encoding)
4551                 return 0;
4552
4553         encoding_info = ext4_sb_read_encoding(es);
4554         if (!encoding_info) {
4555                 ext4_msg(sb, KERN_ERR,
4556                         "Encoding requested by superblock is unknown");
4557                 return -EINVAL;
4558         }
4559
4560         encoding = utf8_load(encoding_info->version);
4561         if (IS_ERR(encoding)) {
4562                 ext4_msg(sb, KERN_ERR,
4563                         "can't mount with superblock charset: %s-%u.%u.%u "
4564                         "not supported by the kernel. flags: 0x%x.",
4565                         encoding_info->name,
4566                         unicode_major(encoding_info->version),
4567                         unicode_minor(encoding_info->version),
4568                         unicode_rev(encoding_info->version),
4569                         encoding_flags);
4570                 return -EINVAL;
4571         }
4572         ext4_msg(sb, KERN_INFO,"Using encoding defined by superblock: "
4573                 "%s-%u.%u.%u with flags 0x%hx", encoding_info->name,
4574                 unicode_major(encoding_info->version),
4575                 unicode_minor(encoding_info->version),
4576                 unicode_rev(encoding_info->version),
4577                 encoding_flags);
4578
4579         sb->s_encoding = encoding;
4580         sb->s_encoding_flags = encoding_flags;
4581
4582         return 0;
4583 }
4584 #else
4585 static inline int ext4_encoding_init(struct super_block *sb, struct ext4_super_block *es)
4586 {
4587         return 0;
4588 }
4589 #endif
4590
4591 static int ext4_init_metadata_csum(struct super_block *sb, struct ext4_super_block *es)
4592 {
4593         struct ext4_sb_info *sbi = EXT4_SB(sb);
4594
4595         /* Warn if metadata_csum and gdt_csum are both set. */
4596         if (ext4_has_feature_metadata_csum(sb) &&
4597             ext4_has_feature_gdt_csum(sb))
4598                 ext4_warning(sb, "metadata_csum and uninit_bg are "
4599                              "redundant flags; please run fsck.");
4600
4601         /* Check for a known checksum algorithm */
4602         if (!ext4_verify_csum_type(sb, es)) {
4603                 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
4604                          "unknown checksum algorithm.");
4605                 return -EINVAL;
4606         }
4607         ext4_setup_csum_trigger(sb, EXT4_JTR_ORPHAN_FILE,
4608                                 ext4_orphan_file_block_trigger);
4609
4610         /* Load the checksum driver */
4611         sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
4612         if (IS_ERR(sbi->s_chksum_driver)) {
4613                 int ret = PTR_ERR(sbi->s_chksum_driver);
4614                 ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
4615                 sbi->s_chksum_driver = NULL;
4616                 return ret;
4617         }
4618
4619         /* Check superblock checksum */
4620         if (!ext4_superblock_csum_verify(sb, es)) {
4621                 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
4622                          "invalid superblock checksum.  Run e2fsck?");
4623                 return -EFSBADCRC;
4624         }
4625
4626         /* Precompute checksum seed for all metadata */
4627         if (ext4_has_feature_csum_seed(sb))
4628                 sbi->s_csum_seed = le32_to_cpu(es->s_checksum_seed);
4629         else if (ext4_has_metadata_csum(sb) || ext4_has_feature_ea_inode(sb))
4630                 sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
4631                                                sizeof(es->s_uuid));
4632         return 0;
4633 }
4634
4635 static int ext4_check_feature_compatibility(struct super_block *sb,
4636                                             struct ext4_super_block *es,
4637                                             int silent)
4638 {
4639         struct ext4_sb_info *sbi = EXT4_SB(sb);
4640
4641         if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
4642             (ext4_has_compat_features(sb) ||
4643              ext4_has_ro_compat_features(sb) ||
4644              ext4_has_incompat_features(sb)))
4645                 ext4_msg(sb, KERN_WARNING,
4646                        "feature flags set on rev 0 fs, "
4647                        "running e2fsck is recommended");
4648
4649         if (es->s_creator_os == cpu_to_le32(EXT4_OS_HURD)) {
4650                 set_opt2(sb, HURD_COMPAT);
4651                 if (ext4_has_feature_64bit(sb)) {
4652                         ext4_msg(sb, KERN_ERR,
4653                                  "The Hurd can't support 64-bit file systems");
4654                         return -EINVAL;
4655                 }
4656
4657                 /*
4658                  * ea_inode feature uses l_i_version field which is not
4659                  * available in HURD_COMPAT mode.
4660                  */
4661                 if (ext4_has_feature_ea_inode(sb)) {
4662                         ext4_msg(sb, KERN_ERR,
4663                                  "ea_inode feature is not supported for Hurd");
4664                         return -EINVAL;
4665                 }
4666         }
4667
4668         if (IS_EXT2_SB(sb)) {
4669                 if (ext2_feature_set_ok(sb))
4670                         ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
4671                                  "using the ext4 subsystem");
4672                 else {
4673                         /*
4674                          * If we're probing be silent, if this looks like
4675                          * it's actually an ext[34] filesystem.
4676                          */
4677                         if (silent && ext4_feature_set_ok(sb, sb_rdonly(sb)))
4678                                 return -EINVAL;
4679                         ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
4680                                  "to feature incompatibilities");
4681                         return -EINVAL;
4682                 }
4683         }
4684
4685         if (IS_EXT3_SB(sb)) {
4686                 if (ext3_feature_set_ok(sb))
4687                         ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
4688                                  "using the ext4 subsystem");
4689                 else {
4690                         /*
4691                          * If we're probing be silent, if this looks like
4692                          * it's actually an ext4 filesystem.
4693                          */
4694                         if (silent && ext4_feature_set_ok(sb, sb_rdonly(sb)))
4695                                 return -EINVAL;
4696                         ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
4697                                  "to feature incompatibilities");
4698                         return -EINVAL;
4699                 }
4700         }
4701
4702         /*
4703          * Check feature flags regardless of the revision level, since we
4704          * previously didn't change the revision level when setting the flags,
4705          * so there is a chance incompat flags are set on a rev 0 filesystem.
4706          */
4707         if (!ext4_feature_set_ok(sb, (sb_rdonly(sb))))
4708                 return -EINVAL;
4709
4710         if (sbi->s_daxdev) {
4711                 if (sb->s_blocksize == PAGE_SIZE)
4712                         set_bit(EXT4_FLAGS_BDEV_IS_DAX, &sbi->s_ext4_flags);
4713                 else
4714                         ext4_msg(sb, KERN_ERR, "unsupported blocksize for DAX\n");
4715         }
4716
4717         if (sbi->s_mount_opt & EXT4_MOUNT_DAX_ALWAYS) {
4718                 if (ext4_has_feature_inline_data(sb)) {
4719                         ext4_msg(sb, KERN_ERR, "Cannot use DAX on a filesystem"
4720                                         " that may contain inline data");
4721                         return -EINVAL;
4722                 }
4723                 if (!test_bit(EXT4_FLAGS_BDEV_IS_DAX, &sbi->s_ext4_flags)) {
4724                         ext4_msg(sb, KERN_ERR,
4725                                 "DAX unsupported by block device.");
4726                         return -EINVAL;
4727                 }
4728         }
4729
4730         if (ext4_has_feature_encrypt(sb) && es->s_encryption_level) {
4731                 ext4_msg(sb, KERN_ERR, "Unsupported encryption level %d",
4732                          es->s_encryption_level);
4733                 return -EINVAL;
4734         }
4735
4736         return 0;
4737 }
4738
4739 static int ext4_check_geometry(struct super_block *sb,
4740                                struct ext4_super_block *es)
4741 {
4742         struct ext4_sb_info *sbi = EXT4_SB(sb);
4743         __u64 blocks_count;
4744         int err;
4745
4746         if (le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) > (sb->s_blocksize / 4)) {
4747                 ext4_msg(sb, KERN_ERR,
4748                          "Number of reserved GDT blocks insanely large: %d",
4749                          le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks));
4750                 return -EINVAL;
4751         }
4752         /*
4753          * Test whether we have more sectors than will fit in sector_t,
4754          * and whether the max offset is addressable by the page cache.
4755          */
4756         err = generic_check_addressable(sb->s_blocksize_bits,
4757                                         ext4_blocks_count(es));
4758         if (err) {
4759                 ext4_msg(sb, KERN_ERR, "filesystem"
4760                          " too large to mount safely on this system");
4761                 return err;
4762         }
4763
4764         /* check blocks count against device size */
4765         blocks_count = sb_bdev_nr_blocks(sb);
4766         if (blocks_count && ext4_blocks_count(es) > blocks_count) {
4767                 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
4768                        "exceeds size of device (%llu blocks)",
4769                        ext4_blocks_count(es), blocks_count);
4770                 return -EINVAL;
4771         }
4772
4773         /*
4774          * It makes no sense for the first data block to be beyond the end
4775          * of the filesystem.
4776          */
4777         if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
4778                 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
4779                          "block %u is beyond end of filesystem (%llu)",
4780                          le32_to_cpu(es->s_first_data_block),
4781                          ext4_blocks_count(es));
4782                 return -EINVAL;
4783         }
4784         if ((es->s_first_data_block == 0) && (es->s_log_block_size == 0) &&
4785             (sbi->s_cluster_ratio == 1)) {
4786                 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
4787                          "block is 0 with a 1k block and cluster size");
4788                 return -EINVAL;
4789         }
4790
4791         blocks_count = (ext4_blocks_count(es) -
4792                         le32_to_cpu(es->s_first_data_block) +
4793                         EXT4_BLOCKS_PER_GROUP(sb) - 1);
4794         do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
4795         if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
4796                 ext4_msg(sb, KERN_WARNING, "groups count too large: %llu "
4797                        "(block count %llu, first data block %u, "
4798                        "blocks per group %lu)", blocks_count,
4799                        ext4_blocks_count(es),
4800                        le32_to_cpu(es->s_first_data_block),
4801                        EXT4_BLOCKS_PER_GROUP(sb));
4802                 return -EINVAL;
4803         }
4804         sbi->s_groups_count = blocks_count;
4805         sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
4806                         (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
4807         if (((u64)sbi->s_groups_count * sbi->s_inodes_per_group) !=
4808             le32_to_cpu(es->s_inodes_count)) {
4809                 ext4_msg(sb, KERN_ERR, "inodes count not valid: %u vs %llu",
4810                          le32_to_cpu(es->s_inodes_count),
4811                          ((u64)sbi->s_groups_count * sbi->s_inodes_per_group));
4812                 return -EINVAL;
4813         }
4814
4815         return 0;
4816 }
4817
4818 static int ext4_group_desc_init(struct super_block *sb,
4819                                 struct ext4_super_block *es,
4820                                 ext4_fsblk_t logical_sb_block,
4821                                 ext4_group_t *first_not_zeroed)
4822 {
4823         struct ext4_sb_info *sbi = EXT4_SB(sb);
4824         unsigned int db_count;
4825         ext4_fsblk_t block;
4826         int i;
4827
4828         db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
4829                    EXT4_DESC_PER_BLOCK(sb);
4830         if (ext4_has_feature_meta_bg(sb)) {
4831                 if (le32_to_cpu(es->s_first_meta_bg) > db_count) {
4832                         ext4_msg(sb, KERN_WARNING,
4833                                  "first meta block group too large: %u "
4834                                  "(group descriptor block count %u)",
4835                                  le32_to_cpu(es->s_first_meta_bg), db_count);
4836                         return -EINVAL;
4837                 }
4838         }
4839         rcu_assign_pointer(sbi->s_group_desc,
4840                            kvmalloc_array(db_count,
4841                                           sizeof(struct buffer_head *),
4842                                           GFP_KERNEL));
4843         if (sbi->s_group_desc == NULL) {
4844                 ext4_msg(sb, KERN_ERR, "not enough memory");
4845                 return -ENOMEM;
4846         }
4847
4848         bgl_lock_init(sbi->s_blockgroup_lock);
4849
4850         /* Pre-read the descriptors into the buffer cache */
4851         for (i = 0; i < db_count; i++) {
4852                 block = descriptor_loc(sb, logical_sb_block, i);
4853                 ext4_sb_breadahead_unmovable(sb, block);
4854         }
4855
4856         for (i = 0; i < db_count; i++) {
4857                 struct buffer_head *bh;
4858
4859                 block = descriptor_loc(sb, logical_sb_block, i);
4860                 bh = ext4_sb_bread_unmovable(sb, block);
4861                 if (IS_ERR(bh)) {
4862                         ext4_msg(sb, KERN_ERR,
4863                                "can't read group descriptor %d", i);
4864                         sbi->s_gdb_count = i;
4865                         return PTR_ERR(bh);
4866                 }
4867                 rcu_read_lock();
4868                 rcu_dereference(sbi->s_group_desc)[i] = bh;
4869                 rcu_read_unlock();
4870         }
4871         sbi->s_gdb_count = db_count;
4872         if (!ext4_check_descriptors(sb, logical_sb_block, first_not_zeroed)) {
4873                 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
4874                 return -EFSCORRUPTED;
4875         }
4876
4877         return 0;
4878 }
4879
4880 static int ext4_load_and_init_journal(struct super_block *sb,
4881                                       struct ext4_super_block *es,
4882                                       struct ext4_fs_context *ctx)
4883 {
4884         struct ext4_sb_info *sbi = EXT4_SB(sb);
4885         int err;
4886
4887         err = ext4_load_journal(sb, es, ctx->journal_devnum);
4888         if (err)
4889                 return err;
4890
4891         if (ext4_has_feature_64bit(sb) &&
4892             !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
4893                                        JBD2_FEATURE_INCOMPAT_64BIT)) {
4894                 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
4895                 goto out;
4896         }
4897
4898         if (!set_journal_csum_feature_set(sb)) {
4899                 ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
4900                          "feature set");
4901                 goto out;
4902         }
4903
4904         if (test_opt2(sb, JOURNAL_FAST_COMMIT) &&
4905                 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
4906                                           JBD2_FEATURE_INCOMPAT_FAST_COMMIT)) {
4907                 ext4_msg(sb, KERN_ERR,
4908                         "Failed to set fast commit journal feature");
4909                 goto out;
4910         }
4911
4912         /* We have now updated the journal if required, so we can
4913          * validate the data journaling mode. */
4914         switch (test_opt(sb, DATA_FLAGS)) {
4915         case 0:
4916                 /* No mode set, assume a default based on the journal
4917                  * capabilities: ORDERED_DATA if the journal can
4918                  * cope, else JOURNAL_DATA
4919                  */
4920                 if (jbd2_journal_check_available_features
4921                     (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
4922                         set_opt(sb, ORDERED_DATA);
4923                         sbi->s_def_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
4924                 } else {
4925                         set_opt(sb, JOURNAL_DATA);
4926                         sbi->s_def_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
4927                 }
4928                 break;
4929
4930         case EXT4_MOUNT_ORDERED_DATA:
4931         case EXT4_MOUNT_WRITEBACK_DATA:
4932                 if (!jbd2_journal_check_available_features
4933                     (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
4934                         ext4_msg(sb, KERN_ERR, "Journal does not support "
4935                                "requested data journaling mode");
4936                         goto out;
4937                 }
4938                 break;
4939         default:
4940                 break;
4941         }
4942
4943         if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA &&
4944             test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
4945                 ext4_msg(sb, KERN_ERR, "can't mount with "
4946                         "journal_async_commit in data=ordered mode");
4947                 goto out;
4948         }
4949
4950         set_task_ioprio(sbi->s_journal->j_task, ctx->journal_ioprio);
4951
4952         sbi->s_journal->j_submit_inode_data_buffers =
4953                 ext4_journal_submit_inode_data_buffers;
4954         sbi->s_journal->j_finish_inode_data_buffers =
4955                 ext4_journal_finish_inode_data_buffers;
4956
4957         return 0;
4958
4959 out:
4960         /* flush s_error_work before journal destroy. */
4961         flush_work(&sbi->s_error_work);
4962         jbd2_journal_destroy(sbi->s_journal);
4963         sbi->s_journal = NULL;
4964         return -EINVAL;
4965 }
4966
4967 static int ext4_check_journal_data_mode(struct super_block *sb)
4968 {
4969         if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
4970                 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting with "
4971                             "data=journal disables delayed allocation, "
4972                             "dioread_nolock, O_DIRECT and fast_commit support!\n");
4973                 /* can't mount with both data=journal and dioread_nolock. */
4974                 clear_opt(sb, DIOREAD_NOLOCK);
4975                 clear_opt2(sb, JOURNAL_FAST_COMMIT);
4976                 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
4977                         ext4_msg(sb, KERN_ERR, "can't mount with "
4978                                  "both data=journal and delalloc");
4979                         return -EINVAL;
4980                 }
4981                 if (test_opt(sb, DAX_ALWAYS)) {
4982                         ext4_msg(sb, KERN_ERR, "can't mount with "
4983                                  "both data=journal and dax");
4984                         return -EINVAL;
4985                 }
4986                 if (ext4_has_feature_encrypt(sb)) {
4987                         ext4_msg(sb, KERN_WARNING,
4988                                  "encrypted files will use data=ordered "
4989                                  "instead of data journaling mode");
4990                 }
4991                 if (test_opt(sb, DELALLOC))
4992                         clear_opt(sb, DELALLOC);
4993         } else {
4994                 sb->s_iflags |= SB_I_CGROUPWB;
4995         }
4996
4997         return 0;
4998 }
4999
5000 static int ext4_load_super(struct super_block *sb, ext4_fsblk_t *lsb,
5001                            int silent)
5002 {
5003         struct ext4_sb_info *sbi = EXT4_SB(sb);
5004         struct ext4_super_block *es;
5005         ext4_fsblk_t logical_sb_block;
5006         unsigned long offset = 0;
5007         struct buffer_head *bh;
5008         int ret = -EINVAL;
5009         int blocksize;
5010
5011         blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
5012         if (!blocksize) {
5013                 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
5014                 return -EINVAL;
5015         }
5016
5017         /*
5018          * The ext4 superblock will not be buffer aligned for other than 1kB
5019          * block sizes.  We need to calculate the offset from buffer start.
5020          */
5021         if (blocksize != EXT4_MIN_BLOCK_SIZE) {
5022                 logical_sb_block = sbi->s_sb_block * EXT4_MIN_BLOCK_SIZE;
5023                 offset = do_div(logical_sb_block, blocksize);
5024         } else {
5025                 logical_sb_block = sbi->s_sb_block;
5026         }
5027
5028         bh = ext4_sb_bread_unmovable(sb, logical_sb_block);
5029         if (IS_ERR(bh)) {
5030                 ext4_msg(sb, KERN_ERR, "unable to read superblock");
5031                 return PTR_ERR(bh);
5032         }
5033         /*
5034          * Note: s_es must be initialized as soon as possible because
5035          *       some ext4 macro-instructions depend on its value
5036          */
5037         es = (struct ext4_super_block *) (bh->b_data + offset);
5038         sbi->s_es = es;
5039         sb->s_magic = le16_to_cpu(es->s_magic);
5040         if (sb->s_magic != EXT4_SUPER_MAGIC) {
5041                 if (!silent)
5042                         ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
5043                 goto out;
5044         }
5045
5046         if (le32_to_cpu(es->s_log_block_size) >
5047             (EXT4_MAX_BLOCK_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) {
5048                 ext4_msg(sb, KERN_ERR,
5049                          "Invalid log block size: %u",
5050                          le32_to_cpu(es->s_log_block_size));
5051                 goto out;
5052         }
5053         if (le32_to_cpu(es->s_log_cluster_size) >
5054             (EXT4_MAX_CLUSTER_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) {
5055                 ext4_msg(sb, KERN_ERR,
5056                          "Invalid log cluster size: %u",
5057                          le32_to_cpu(es->s_log_cluster_size));
5058                 goto out;
5059         }
5060
5061         blocksize = EXT4_MIN_BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
5062
5063         /*
5064          * If the default block size is not the same as the real block size,
5065          * we need to reload it.
5066          */
5067         if (sb->s_blocksize == blocksize) {
5068                 *lsb = logical_sb_block;
5069                 sbi->s_sbh = bh;
5070                 return 0;
5071         }
5072
5073         /*
5074          * bh must be released before kill_bdev(), otherwise
5075          * it won't be freed and its page also. kill_bdev()
5076          * is called by sb_set_blocksize().
5077          */
5078         brelse(bh);
5079         /* Validate the filesystem blocksize */
5080         if (!sb_set_blocksize(sb, blocksize)) {
5081                 ext4_msg(sb, KERN_ERR, "bad block size %d",
5082                                 blocksize);
5083                 bh = NULL;
5084                 goto out;
5085         }
5086
5087         logical_sb_block = sbi->s_sb_block * EXT4_MIN_BLOCK_SIZE;
5088         offset = do_div(logical_sb_block, blocksize);
5089         bh = ext4_sb_bread_unmovable(sb, logical_sb_block);
5090         if (IS_ERR(bh)) {
5091                 ext4_msg(sb, KERN_ERR, "Can't read superblock on 2nd try");
5092                 ret = PTR_ERR(bh);
5093                 bh = NULL;
5094                 goto out;
5095         }
5096         es = (struct ext4_super_block *)(bh->b_data + offset);
5097         sbi->s_es = es;
5098         if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
5099                 ext4_msg(sb, KERN_ERR, "Magic mismatch, very weird!");
5100                 goto out;
5101         }
5102         *lsb = logical_sb_block;
5103         sbi->s_sbh = bh;
5104         return 0;
5105 out:
5106         brelse(bh);
5107         return ret;
5108 }
5109
5110 static void ext4_hash_info_init(struct super_block *sb)
5111 {
5112         struct ext4_sb_info *sbi = EXT4_SB(sb);
5113         struct ext4_super_block *es = sbi->s_es;
5114         unsigned int i;
5115
5116         for (i = 0; i < 4; i++)
5117                 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
5118
5119         sbi->s_def_hash_version = es->s_def_hash_version;
5120         if (ext4_has_feature_dir_index(sb)) {
5121                 i = le32_to_cpu(es->s_flags);
5122                 if (i & EXT2_FLAGS_UNSIGNED_HASH)
5123                         sbi->s_hash_unsigned = 3;
5124                 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
5125 #ifdef __CHAR_UNSIGNED__
5126                         if (!sb_rdonly(sb))
5127                                 es->s_flags |=
5128                                         cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
5129                         sbi->s_hash_unsigned = 3;
5130 #else
5131                         if (!sb_rdonly(sb))
5132                                 es->s_flags |=
5133                                         cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
5134 #endif
5135                 }
5136         }
5137 }
5138
5139 static int ext4_block_group_meta_init(struct super_block *sb, int silent)
5140 {
5141         struct ext4_sb_info *sbi = EXT4_SB(sb);
5142         struct ext4_super_block *es = sbi->s_es;
5143         int has_huge_files;
5144
5145         has_huge_files = ext4_has_feature_huge_file(sb);
5146         sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
5147                                                       has_huge_files);
5148         sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
5149
5150         sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
5151         if (ext4_has_feature_64bit(sb)) {
5152                 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
5153                     sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
5154                     !is_power_of_2(sbi->s_desc_size)) {
5155                         ext4_msg(sb, KERN_ERR,
5156                                "unsupported descriptor size %lu",
5157                                sbi->s_desc_size);
5158                         return -EINVAL;
5159                 }
5160         } else
5161                 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
5162
5163         sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
5164         sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
5165
5166         sbi->s_inodes_per_block = sb->s_blocksize / EXT4_INODE_SIZE(sb);
5167         if (sbi->s_inodes_per_block == 0 || sbi->s_blocks_per_group == 0) {
5168                 if (!silent)
5169                         ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
5170                 return -EINVAL;
5171         }
5172         if (sbi->s_inodes_per_group < sbi->s_inodes_per_block ||
5173             sbi->s_inodes_per_group > sb->s_blocksize * 8) {
5174                 ext4_msg(sb, KERN_ERR, "invalid inodes per group: %lu\n",
5175                          sbi->s_inodes_per_group);
5176                 return -EINVAL;
5177         }
5178         sbi->s_itb_per_group = sbi->s_inodes_per_group /
5179                                         sbi->s_inodes_per_block;
5180         sbi->s_desc_per_block = sb->s_blocksize / EXT4_DESC_SIZE(sb);
5181         sbi->s_mount_state = le16_to_cpu(es->s_state) & ~EXT4_FC_REPLAY;
5182         sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
5183         sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
5184
5185         return 0;
5186 }
5187
5188 static int __ext4_fill_super(struct fs_context *fc, struct super_block *sb)
5189 {
5190         struct ext4_super_block *es = NULL;
5191         struct ext4_sb_info *sbi = EXT4_SB(sb);
5192         ext4_fsblk_t logical_sb_block;
5193         struct inode *root;
5194         int needs_recovery;
5195         int err;
5196         ext4_group_t first_not_zeroed;
5197         struct ext4_fs_context *ctx = fc->fs_private;
5198         int silent = fc->sb_flags & SB_SILENT;
5199
5200         /* Set defaults for the variables that will be set during parsing */
5201         if (!(ctx->spec & EXT4_SPEC_JOURNAL_IOPRIO))
5202                 ctx->journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
5203
5204         sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
5205         sbi->s_sectors_written_start =
5206                 part_stat_read(sb->s_bdev, sectors[STAT_WRITE]);
5207
5208         err = ext4_load_super(sb, &logical_sb_block, silent);
5209         if (err)
5210                 goto out_fail;
5211
5212         es = sbi->s_es;
5213         sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
5214
5215         err = ext4_init_metadata_csum(sb, es);
5216         if (err)
5217                 goto failed_mount;
5218
5219         ext4_set_def_opts(sb, es);
5220
5221         sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
5222         sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
5223         sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
5224         sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
5225         sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
5226
5227         /*
5228          * set default s_li_wait_mult for lazyinit, for the case there is
5229          * no mount option specified.
5230          */
5231         sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
5232
5233         err = ext4_inode_info_init(sb, es);
5234         if (err)
5235                 goto failed_mount;
5236
5237         err = parse_apply_sb_mount_options(sb, ctx);
5238         if (err < 0)
5239                 goto failed_mount;
5240
5241         sbi->s_def_mount_opt = sbi->s_mount_opt;
5242         sbi->s_def_mount_opt2 = sbi->s_mount_opt2;
5243
5244         err = ext4_check_opt_consistency(fc, sb);
5245         if (err < 0)
5246                 goto failed_mount;
5247
5248         ext4_apply_options(fc, sb);
5249
5250         err = ext4_encoding_init(sb, es);
5251         if (err)
5252                 goto failed_mount;
5253
5254         err = ext4_check_journal_data_mode(sb);
5255         if (err)
5256                 goto failed_mount;
5257
5258         sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
5259                 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0);
5260
5261         /* i_version is always enabled now */
5262         sb->s_flags |= SB_I_VERSION;
5263
5264         err = ext4_check_feature_compatibility(sb, es, silent);
5265         if (err)
5266                 goto failed_mount;
5267
5268         err = ext4_block_group_meta_init(sb, silent);
5269         if (err)
5270                 goto failed_mount;
5271
5272         ext4_hash_info_init(sb);
5273
5274         err = ext4_handle_clustersize(sb);
5275         if (err)
5276                 goto failed_mount;
5277
5278         err = ext4_check_geometry(sb, es);
5279         if (err)
5280                 goto failed_mount;
5281
5282         timer_setup(&sbi->s_err_report, print_daily_error_info, 0);
5283         spin_lock_init(&sbi->s_error_lock);
5284         INIT_WORK(&sbi->s_error_work, flush_stashed_error_work);
5285
5286         err = ext4_group_desc_init(sb, es, logical_sb_block, &first_not_zeroed);
5287         if (err)
5288                 goto failed_mount3;
5289
5290         err = ext4_es_register_shrinker(sbi);
5291         if (err)
5292                 goto failed_mount3;
5293
5294         sbi->s_stripe = ext4_get_stripe_size(sbi);
5295         /*
5296          * It's hard to get stripe aligned blocks if stripe is not aligned with
5297          * cluster, just disable stripe and alert user to simpfy code and avoid
5298          * stripe aligned allocation which will rarely successes.
5299          */
5300         if (sbi->s_stripe > 0 && sbi->s_cluster_ratio > 1 &&
5301             sbi->s_stripe % sbi->s_cluster_ratio != 0) {
5302                 ext4_msg(sb, KERN_WARNING,
5303                          "stripe (%lu) is not aligned with cluster size (%u), "
5304                          "stripe is disabled",
5305                          sbi->s_stripe, sbi->s_cluster_ratio);
5306                 sbi->s_stripe = 0;
5307         }
5308         sbi->s_extent_max_zeroout_kb = 32;
5309
5310         /*
5311          * set up enough so that it can read an inode
5312          */
5313         sb->s_op = &ext4_sops;
5314         sb->s_export_op = &ext4_export_ops;
5315         sb->s_xattr = ext4_xattr_handlers;
5316 #ifdef CONFIG_FS_ENCRYPTION
5317         sb->s_cop = &ext4_cryptops;
5318 #endif
5319 #ifdef CONFIG_FS_VERITY
5320         sb->s_vop = &ext4_verityops;
5321 #endif
5322 #ifdef CONFIG_QUOTA
5323         sb->dq_op = &ext4_quota_operations;
5324         if (ext4_has_feature_quota(sb))
5325                 sb->s_qcop = &dquot_quotactl_sysfile_ops;
5326         else
5327                 sb->s_qcop = &ext4_qctl_operations;
5328         sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
5329 #endif
5330         memcpy(&sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
5331
5332         INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
5333         mutex_init(&sbi->s_orphan_lock);
5334
5335         ext4_fast_commit_init(sb);
5336
5337         sb->s_root = NULL;
5338
5339         needs_recovery = (es->s_last_orphan != 0 ||
5340                           ext4_has_feature_orphan_present(sb) ||
5341                           ext4_has_feature_journal_needs_recovery(sb));
5342
5343         if (ext4_has_feature_mmp(sb) && !sb_rdonly(sb)) {
5344                 err = ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block));
5345                 if (err)
5346                         goto failed_mount3a;
5347         }
5348
5349         err = -EINVAL;
5350         /*
5351          * The first inode we look at is the journal inode.  Don't try
5352          * root first: it may be modified in the journal!
5353          */
5354         if (!test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb)) {
5355                 err = ext4_load_and_init_journal(sb, es, ctx);
5356                 if (err)
5357                         goto failed_mount3a;
5358         } else if (test_opt(sb, NOLOAD) && !sb_rdonly(sb) &&
5359                    ext4_has_feature_journal_needs_recovery(sb)) {
5360                 ext4_msg(sb, KERN_ERR, "required journal recovery "
5361                        "suppressed and not mounted read-only");
5362                 goto failed_mount3a;
5363         } else {
5364                 /* Nojournal mode, all journal mount options are illegal */
5365                 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
5366                         ext4_msg(sb, KERN_ERR, "can't mount with "
5367                                  "journal_async_commit, fs mounted w/o journal");
5368                         goto failed_mount3a;
5369                 }
5370
5371                 if (test_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM)) {
5372                         ext4_msg(sb, KERN_ERR, "can't mount with "
5373                                  "journal_checksum, fs mounted w/o journal");
5374                         goto failed_mount3a;
5375                 }
5376                 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
5377                         ext4_msg(sb, KERN_ERR, "can't mount with "
5378                                  "commit=%lu, fs mounted w/o journal",
5379                                  sbi->s_commit_interval / HZ);
5380                         goto failed_mount3a;
5381                 }
5382                 if (EXT4_MOUNT_DATA_FLAGS &
5383                     (sbi->s_mount_opt ^ sbi->s_def_mount_opt)) {
5384                         ext4_msg(sb, KERN_ERR, "can't mount with "
5385                                  "data=, fs mounted w/o journal");
5386                         goto failed_mount3a;
5387                 }
5388                 sbi->s_def_mount_opt &= ~EXT4_MOUNT_JOURNAL_CHECKSUM;
5389                 clear_opt(sb, JOURNAL_CHECKSUM);
5390                 clear_opt(sb, DATA_FLAGS);
5391                 clear_opt2(sb, JOURNAL_FAST_COMMIT);
5392                 sbi->s_journal = NULL;
5393                 needs_recovery = 0;
5394         }
5395
5396         if (!test_opt(sb, NO_MBCACHE)) {
5397                 sbi->s_ea_block_cache = ext4_xattr_create_cache();
5398                 if (!sbi->s_ea_block_cache) {
5399                         ext4_msg(sb, KERN_ERR,
5400                                  "Failed to create ea_block_cache");
5401                         err = -EINVAL;
5402                         goto failed_mount_wq;
5403                 }
5404
5405                 if (ext4_has_feature_ea_inode(sb)) {
5406                         sbi->s_ea_inode_cache = ext4_xattr_create_cache();
5407                         if (!sbi->s_ea_inode_cache) {
5408                                 ext4_msg(sb, KERN_ERR,
5409                                          "Failed to create ea_inode_cache");
5410                                 err = -EINVAL;
5411                                 goto failed_mount_wq;
5412                         }
5413                 }
5414         }
5415
5416         /*
5417          * Get the # of file system overhead blocks from the
5418          * superblock if present.
5419          */
5420         sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
5421         /* ignore the precalculated value if it is ridiculous */
5422         if (sbi->s_overhead > ext4_blocks_count(es))
5423                 sbi->s_overhead = 0;
5424         /*
5425          * If the bigalloc feature is not enabled recalculating the
5426          * overhead doesn't take long, so we might as well just redo
5427          * it to make sure we are using the correct value.
5428          */
5429         if (!ext4_has_feature_bigalloc(sb))
5430                 sbi->s_overhead = 0;
5431         if (sbi->s_overhead == 0) {
5432                 err = ext4_calculate_overhead(sb);
5433                 if (err)
5434                         goto failed_mount_wq;
5435         }
5436
5437         /*
5438          * The maximum number of concurrent works can be high and
5439          * concurrency isn't really necessary.  Limit it to 1.
5440          */
5441         EXT4_SB(sb)->rsv_conversion_wq =
5442                 alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
5443         if (!EXT4_SB(sb)->rsv_conversion_wq) {
5444                 printk(KERN_ERR "EXT4-fs: failed to create workqueue\n");
5445                 err = -ENOMEM;
5446                 goto failed_mount4;
5447         }
5448
5449         /*
5450          * The jbd2_journal_load will have done any necessary log recovery,
5451          * so we can safely mount the rest of the filesystem now.
5452          */
5453
5454         root = ext4_iget(sb, EXT4_ROOT_INO, EXT4_IGET_SPECIAL);
5455         if (IS_ERR(root)) {
5456                 ext4_msg(sb, KERN_ERR, "get root inode failed");
5457                 err = PTR_ERR(root);
5458                 root = NULL;
5459                 goto failed_mount4;
5460         }
5461         if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
5462                 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
5463                 iput(root);
5464                 err = -EFSCORRUPTED;
5465                 goto failed_mount4;
5466         }
5467
5468         sb->s_root = d_make_root(root);
5469         if (!sb->s_root) {
5470                 ext4_msg(sb, KERN_ERR, "get root dentry failed");
5471                 err = -ENOMEM;
5472                 goto failed_mount4;
5473         }
5474
5475         err = ext4_setup_super(sb, es, sb_rdonly(sb));
5476         if (err == -EROFS) {
5477                 sb->s_flags |= SB_RDONLY;
5478         } else if (err)
5479                 goto failed_mount4a;
5480
5481         ext4_set_resv_clusters(sb);
5482
5483         if (test_opt(sb, BLOCK_VALIDITY)) {
5484                 err = ext4_setup_system_zone(sb);
5485                 if (err) {
5486                         ext4_msg(sb, KERN_ERR, "failed to initialize system "
5487                                  "zone (%d)", err);
5488                         goto failed_mount4a;
5489                 }
5490         }
5491         ext4_fc_replay_cleanup(sb);
5492
5493         ext4_ext_init(sb);
5494
5495         /*
5496          * Enable optimize_scan if number of groups is > threshold. This can be
5497          * turned off by passing "mb_optimize_scan=0". This can also be
5498          * turned on forcefully by passing "mb_optimize_scan=1".
5499          */
5500         if (!(ctx->spec & EXT4_SPEC_mb_optimize_scan)) {
5501                 if (sbi->s_groups_count >= MB_DEFAULT_LINEAR_SCAN_THRESHOLD)
5502                         set_opt2(sb, MB_OPTIMIZE_SCAN);
5503                 else
5504                         clear_opt2(sb, MB_OPTIMIZE_SCAN);
5505         }
5506
5507         err = ext4_mb_init(sb);
5508         if (err) {
5509                 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
5510                          err);
5511                 goto failed_mount5;
5512         }
5513
5514         /*
5515          * We can only set up the journal commit callback once
5516          * mballoc is initialized
5517          */
5518         if (sbi->s_journal)
5519                 sbi->s_journal->j_commit_callback =
5520                         ext4_journal_commit_callback;
5521
5522         err = ext4_percpu_param_init(sbi);
5523         if (err)
5524                 goto failed_mount6;
5525
5526         if (ext4_has_feature_flex_bg(sb))
5527                 if (!ext4_fill_flex_info(sb)) {
5528                         ext4_msg(sb, KERN_ERR,
5529                                "unable to initialize "
5530                                "flex_bg meta info!");
5531                         err = -ENOMEM;
5532                         goto failed_mount6;
5533                 }
5534
5535         err = ext4_register_li_request(sb, first_not_zeroed);
5536         if (err)
5537                 goto failed_mount6;
5538
5539         err = ext4_register_sysfs(sb);
5540         if (err)
5541                 goto failed_mount7;
5542
5543         err = ext4_init_orphan_info(sb);
5544         if (err)
5545                 goto failed_mount8;
5546 #ifdef CONFIG_QUOTA
5547         /* Enable quota usage during mount. */
5548         if (ext4_has_feature_quota(sb) && !sb_rdonly(sb)) {
5549                 err = ext4_enable_quotas(sb);
5550                 if (err)
5551                         goto failed_mount9;
5552         }
5553 #endif  /* CONFIG_QUOTA */
5554
5555         /*
5556          * Save the original bdev mapping's wb_err value which could be
5557          * used to detect the metadata async write error.
5558          */
5559         spin_lock_init(&sbi->s_bdev_wb_lock);
5560         errseq_check_and_advance(&sb->s_bdev->bd_inode->i_mapping->wb_err,
5561                                  &sbi->s_bdev_wb_err);
5562         EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
5563         ext4_orphan_cleanup(sb, es);
5564         EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
5565         /*
5566          * Update the checksum after updating free space/inode counters and
5567          * ext4_orphan_cleanup. Otherwise the superblock can have an incorrect
5568          * checksum in the buffer cache until it is written out and
5569          * e2fsprogs programs trying to open a file system immediately
5570          * after it is mounted can fail.
5571          */
5572         ext4_superblock_csum_set(sb);
5573         if (needs_recovery) {
5574                 ext4_msg(sb, KERN_INFO, "recovery complete");
5575                 err = ext4_mark_recovery_complete(sb, es);
5576                 if (err)
5577                         goto failed_mount10;
5578         }
5579
5580         if (test_opt(sb, DISCARD) && !bdev_max_discard_sectors(sb->s_bdev))
5581                 ext4_msg(sb, KERN_WARNING,
5582                          "mounting with \"discard\" option, but the device does not support discard");
5583
5584         if (es->s_error_count)
5585                 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
5586
5587         /* Enable message ratelimiting. Default is 10 messages per 5 secs. */
5588         ratelimit_state_init(&sbi->s_err_ratelimit_state, 5 * HZ, 10);
5589         ratelimit_state_init(&sbi->s_warning_ratelimit_state, 5 * HZ, 10);
5590         ratelimit_state_init(&sbi->s_msg_ratelimit_state, 5 * HZ, 10);
5591         atomic_set(&sbi->s_warning_count, 0);
5592         atomic_set(&sbi->s_msg_count, 0);
5593
5594         return 0;
5595
5596 failed_mount10:
5597         ext4_quotas_off(sb, EXT4_MAXQUOTAS);
5598 failed_mount9: __maybe_unused
5599         ext4_release_orphan_info(sb);
5600 failed_mount8:
5601         ext4_unregister_sysfs(sb);
5602         kobject_put(&sbi->s_kobj);
5603 failed_mount7:
5604         ext4_unregister_li_request(sb);
5605 failed_mount6:
5606         ext4_mb_release(sb);
5607         ext4_flex_groups_free(sbi);
5608         ext4_percpu_param_destroy(sbi);
5609 failed_mount5:
5610         ext4_ext_release(sb);
5611         ext4_release_system_zone(sb);
5612 failed_mount4a:
5613         dput(sb->s_root);
5614         sb->s_root = NULL;
5615 failed_mount4:
5616         ext4_msg(sb, KERN_ERR, "mount failed");
5617         if (EXT4_SB(sb)->rsv_conversion_wq)
5618                 destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
5619 failed_mount_wq:
5620         ext4_xattr_destroy_cache(sbi->s_ea_inode_cache);
5621         sbi->s_ea_inode_cache = NULL;
5622
5623         ext4_xattr_destroy_cache(sbi->s_ea_block_cache);
5624         sbi->s_ea_block_cache = NULL;
5625
5626         if (sbi->s_journal) {
5627                 /* flush s_error_work before journal destroy. */
5628                 flush_work(&sbi->s_error_work);
5629                 jbd2_journal_destroy(sbi->s_journal);
5630                 sbi->s_journal = NULL;
5631         }
5632 failed_mount3a:
5633         ext4_es_unregister_shrinker(sbi);
5634 failed_mount3:
5635         /* flush s_error_work before sbi destroy */
5636         flush_work(&sbi->s_error_work);
5637         del_timer_sync(&sbi->s_err_report);
5638         ext4_stop_mmpd(sbi);
5639         ext4_group_desc_free(sbi);
5640 failed_mount:
5641         if (sbi->s_chksum_driver)
5642                 crypto_free_shash(sbi->s_chksum_driver);
5643
5644 #if IS_ENABLED(CONFIG_UNICODE)
5645         utf8_unload(sb->s_encoding);
5646 #endif
5647
5648 #ifdef CONFIG_QUOTA
5649         for (unsigned int i = 0; i < EXT4_MAXQUOTAS; i++)
5650                 kfree(get_qf_name(sb, sbi, i));
5651 #endif
5652         fscrypt_free_dummy_policy(&sbi->s_dummy_enc_policy);
5653         brelse(sbi->s_sbh);
5654         if (sbi->s_journal_bdev) {
5655                 invalidate_bdev(sbi->s_journal_bdev);
5656                 blkdev_put(sbi->s_journal_bdev, sb);
5657         }
5658 out_fail:
5659         invalidate_bdev(sb->s_bdev);
5660         sb->s_fs_info = NULL;
5661         return err;
5662 }
5663
5664 static int ext4_fill_super(struct super_block *sb, struct fs_context *fc)
5665 {
5666         struct ext4_fs_context *ctx = fc->fs_private;
5667         struct ext4_sb_info *sbi;
5668         const char *descr;
5669         int ret;
5670
5671         sbi = ext4_alloc_sbi(sb);
5672         if (!sbi)
5673                 return -ENOMEM;
5674
5675         fc->s_fs_info = sbi;
5676
5677         /* Cleanup superblock name */
5678         strreplace(sb->s_id, '/', '!');
5679
5680         sbi->s_sb_block = 1;    /* Default super block location */
5681         if (ctx->spec & EXT4_SPEC_s_sb_block)
5682                 sbi->s_sb_block = ctx->s_sb_block;
5683
5684         ret = __ext4_fill_super(fc, sb);
5685         if (ret < 0)
5686                 goto free_sbi;
5687
5688         if (sbi->s_journal) {
5689                 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
5690                         descr = " journalled data mode";
5691                 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
5692                         descr = " ordered data mode";
5693                 else
5694                         descr = " writeback data mode";
5695         } else
5696                 descr = "out journal";
5697
5698         if (___ratelimit(&ext4_mount_msg_ratelimit, "EXT4-fs mount"))
5699                 ext4_msg(sb, KERN_INFO, "mounted filesystem %pU %s with%s. "
5700                          "Quota mode: %s.", &sb->s_uuid,
5701                          sb_rdonly(sb) ? "ro" : "r/w", descr,
5702                          ext4_quota_mode(sb));
5703
5704         /* Update the s_overhead_clusters if necessary */
5705         ext4_update_overhead(sb, false);
5706         return 0;
5707
5708 free_sbi:
5709         ext4_free_sbi(sbi);
5710         fc->s_fs_info = NULL;
5711         return ret;
5712 }
5713
5714 static int ext4_get_tree(struct fs_context *fc)
5715 {
5716         return get_tree_bdev(fc, ext4_fill_super);
5717 }
5718
5719 /*
5720  * Setup any per-fs journal parameters now.  We'll do this both on
5721  * initial mount, once the journal has been initialised but before we've
5722  * done any recovery; and again on any subsequent remount.
5723  */
5724 static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
5725 {
5726         struct ext4_sb_info *sbi = EXT4_SB(sb);
5727
5728         journal->j_commit_interval = sbi->s_commit_interval;
5729         journal->j_min_batch_time = sbi->s_min_batch_time;
5730         journal->j_max_batch_time = sbi->s_max_batch_time;
5731         ext4_fc_init(sb, journal);
5732
5733         write_lock(&journal->j_state_lock);
5734         if (test_opt(sb, BARRIER))
5735                 journal->j_flags |= JBD2_BARRIER;
5736         else
5737                 journal->j_flags &= ~JBD2_BARRIER;
5738         if (test_opt(sb, DATA_ERR_ABORT))
5739                 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
5740         else
5741                 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
5742         /*
5743          * Always enable journal cycle record option, letting the journal
5744          * records log transactions continuously between each mount.
5745          */
5746         journal->j_flags |= JBD2_CYCLE_RECORD;
5747         write_unlock(&journal->j_state_lock);
5748 }
5749
5750 static struct inode *ext4_get_journal_inode(struct super_block *sb,
5751                                              unsigned int journal_inum)
5752 {
5753         struct inode *journal_inode;
5754
5755         /*
5756          * Test for the existence of a valid inode on disk.  Bad things
5757          * happen if we iget() an unused inode, as the subsequent iput()
5758          * will try to delete it.
5759          */
5760         journal_inode = ext4_iget(sb, journal_inum, EXT4_IGET_SPECIAL);
5761         if (IS_ERR(journal_inode)) {
5762                 ext4_msg(sb, KERN_ERR, "no journal found");
5763                 return NULL;
5764         }
5765         if (!journal_inode->i_nlink) {
5766                 make_bad_inode(journal_inode);
5767                 iput(journal_inode);
5768                 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
5769                 return NULL;
5770         }
5771
5772         ext4_debug("Journal inode found at %p: %lld bytes\n",
5773                   journal_inode, journal_inode->i_size);
5774         if (!S_ISREG(journal_inode->i_mode) || IS_ENCRYPTED(journal_inode)) {
5775                 ext4_msg(sb, KERN_ERR, "invalid journal inode");
5776                 iput(journal_inode);
5777                 return NULL;
5778         }
5779         return journal_inode;
5780 }
5781
5782 static int ext4_journal_bmap(journal_t *journal, sector_t *block)
5783 {
5784         struct ext4_map_blocks map;
5785         int ret;
5786
5787         if (journal->j_inode == NULL)
5788                 return 0;
5789
5790         map.m_lblk = *block;
5791         map.m_len = 1;
5792         ret = ext4_map_blocks(NULL, journal->j_inode, &map, 0);
5793         if (ret <= 0) {
5794                 ext4_msg(journal->j_inode->i_sb, KERN_CRIT,
5795                          "journal bmap failed: block %llu ret %d\n",
5796                          *block, ret);
5797                 jbd2_journal_abort(journal, ret ? ret : -EIO);
5798                 return ret;
5799         }
5800         *block = map.m_pblk;
5801         return 0;
5802 }
5803
5804 static journal_t *ext4_get_journal(struct super_block *sb,
5805                                    unsigned int journal_inum)
5806 {
5807         struct inode *journal_inode;
5808         journal_t *journal;
5809
5810         if (WARN_ON_ONCE(!ext4_has_feature_journal(sb)))
5811                 return NULL;
5812
5813         journal_inode = ext4_get_journal_inode(sb, journal_inum);
5814         if (!journal_inode)
5815                 return NULL;
5816
5817         journal = jbd2_journal_init_inode(journal_inode);
5818         if (!journal) {
5819                 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
5820                 iput(journal_inode);
5821                 return NULL;
5822         }
5823         journal->j_private = sb;
5824         journal->j_bmap = ext4_journal_bmap;
5825         ext4_init_journal_params(sb, journal);
5826         return journal;
5827 }
5828
5829 static journal_t *ext4_get_dev_journal(struct super_block *sb,
5830                                        dev_t j_dev)
5831 {
5832         struct buffer_head *bh;
5833         journal_t *journal;
5834         ext4_fsblk_t start;
5835         ext4_fsblk_t len;
5836         int hblock, blocksize;
5837         ext4_fsblk_t sb_block;
5838         unsigned long offset;
5839         struct ext4_super_block *es;
5840         struct block_device *bdev;
5841
5842         if (WARN_ON_ONCE(!ext4_has_feature_journal(sb)))
5843                 return NULL;
5844
5845         /* see get_tree_bdev why this is needed and safe */
5846         up_write(&sb->s_umount);
5847         bdev = ext4_blkdev_get(j_dev, sb);
5848         down_write(&sb->s_umount);
5849         if (bdev == NULL)
5850                 return NULL;
5851
5852         blocksize = sb->s_blocksize;
5853         hblock = bdev_logical_block_size(bdev);
5854         if (blocksize < hblock) {
5855                 ext4_msg(sb, KERN_ERR,
5856                         "blocksize too small for journal device");
5857                 goto out_bdev;
5858         }
5859
5860         sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
5861         offset = EXT4_MIN_BLOCK_SIZE % blocksize;
5862         set_blocksize(bdev, blocksize);
5863         if (!(bh = __bread(bdev, sb_block, blocksize))) {
5864                 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
5865                        "external journal");
5866                 goto out_bdev;
5867         }
5868
5869         es = (struct ext4_super_block *) (bh->b_data + offset);
5870         if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
5871             !(le32_to_cpu(es->s_feature_incompat) &
5872               EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
5873                 ext4_msg(sb, KERN_ERR, "external journal has "
5874                                         "bad superblock");
5875                 brelse(bh);
5876                 goto out_bdev;
5877         }
5878
5879         if ((le32_to_cpu(es->s_feature_ro_compat) &
5880              EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
5881             es->s_checksum != ext4_superblock_csum(sb, es)) {
5882                 ext4_msg(sb, KERN_ERR, "external journal has "
5883                                        "corrupt superblock");
5884                 brelse(bh);
5885                 goto out_bdev;
5886         }
5887
5888         if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
5889                 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
5890                 brelse(bh);
5891                 goto out_bdev;
5892         }
5893
5894         len = ext4_blocks_count(es);
5895         start = sb_block + 1;
5896         brelse(bh);     /* we're done with the superblock */
5897
5898         journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
5899                                         start, len, blocksize);
5900         if (!journal) {
5901                 ext4_msg(sb, KERN_ERR, "failed to create device journal");
5902                 goto out_bdev;
5903         }
5904         journal->j_private = sb;
5905         if (ext4_read_bh_lock(journal->j_sb_buffer, REQ_META | REQ_PRIO, true)) {
5906                 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
5907                 goto out_journal;
5908         }
5909         if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
5910                 ext4_msg(sb, KERN_ERR, "External journal has more than one "
5911                                         "user (unsupported) - %d",
5912                         be32_to_cpu(journal->j_superblock->s_nr_users));
5913                 goto out_journal;
5914         }
5915         EXT4_SB(sb)->s_journal_bdev = bdev;
5916         ext4_init_journal_params(sb, journal);
5917         return journal;
5918
5919 out_journal:
5920         jbd2_journal_destroy(journal);
5921 out_bdev:
5922         blkdev_put(bdev, sb);
5923         return NULL;
5924 }
5925
5926 static int ext4_load_journal(struct super_block *sb,
5927                              struct ext4_super_block *es,
5928                              unsigned long journal_devnum)
5929 {
5930         journal_t *journal;
5931         unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
5932         dev_t journal_dev;
5933         int err = 0;
5934         int really_read_only;
5935         int journal_dev_ro;
5936
5937         if (WARN_ON_ONCE(!ext4_has_feature_journal(sb)))
5938                 return -EFSCORRUPTED;
5939
5940         if (journal_devnum &&
5941             journal_devnum != le32_to_cpu(es->s_journal_dev)) {
5942                 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
5943                         "numbers have changed");
5944                 journal_dev = new_decode_dev(journal_devnum);
5945         } else
5946                 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
5947
5948         if (journal_inum && journal_dev) {
5949                 ext4_msg(sb, KERN_ERR,
5950                          "filesystem has both journal inode and journal device!");
5951                 return -EINVAL;
5952         }
5953
5954         if (journal_inum) {
5955                 journal = ext4_get_journal(sb, journal_inum);
5956                 if (!journal)
5957                         return -EINVAL;
5958         } else {
5959                 journal = ext4_get_dev_journal(sb, journal_dev);
5960                 if (!journal)
5961                         return -EINVAL;
5962         }
5963
5964         journal_dev_ro = bdev_read_only(journal->j_dev);
5965         really_read_only = bdev_read_only(sb->s_bdev) | journal_dev_ro;
5966
5967         if (journal_dev_ro && !sb_rdonly(sb)) {
5968                 ext4_msg(sb, KERN_ERR,
5969                          "journal device read-only, try mounting with '-o ro'");
5970                 err = -EROFS;
5971                 goto err_out;
5972         }
5973
5974         /*
5975          * Are we loading a blank journal or performing recovery after a
5976          * crash?  For recovery, we need to check in advance whether we
5977          * can get read-write access to the device.
5978          */
5979         if (ext4_has_feature_journal_needs_recovery(sb)) {
5980                 if (sb_rdonly(sb)) {
5981                         ext4_msg(sb, KERN_INFO, "INFO: recovery "
5982                                         "required on readonly filesystem");
5983                         if (really_read_only) {
5984                                 ext4_msg(sb, KERN_ERR, "write access "
5985                                         "unavailable, cannot proceed "
5986                                         "(try mounting with noload)");
5987                                 err = -EROFS;
5988                                 goto err_out;
5989                         }
5990                         ext4_msg(sb, KERN_INFO, "write access will "
5991                                "be enabled during recovery");
5992                 }
5993         }
5994
5995         if (!(journal->j_flags & JBD2_BARRIER))
5996                 ext4_msg(sb, KERN_INFO, "barriers disabled");
5997
5998         if (!ext4_has_feature_journal_needs_recovery(sb))
5999                 err = jbd2_journal_wipe(journal, !really_read_only);
6000         if (!err) {
6001                 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
6002                 __le16 orig_state;
6003                 bool changed = false;
6004
6005                 if (save)
6006                         memcpy(save, ((char *) es) +
6007                                EXT4_S_ERR_START, EXT4_S_ERR_LEN);
6008                 err = jbd2_journal_load(journal);
6009                 if (save && memcmp(((char *) es) + EXT4_S_ERR_START,
6010                                    save, EXT4_S_ERR_LEN)) {
6011                         memcpy(((char *) es) + EXT4_S_ERR_START,
6012                                save, EXT4_S_ERR_LEN);
6013                         changed = true;
6014                 }
6015                 kfree(save);
6016                 orig_state = es->s_state;
6017                 es->s_state |= cpu_to_le16(EXT4_SB(sb)->s_mount_state &
6018                                            EXT4_ERROR_FS);
6019                 if (orig_state != es->s_state)
6020                         changed = true;
6021                 /* Write out restored error information to the superblock */
6022                 if (changed && !really_read_only) {
6023                         int err2;
6024                         err2 = ext4_commit_super(sb);
6025                         err = err ? : err2;
6026                 }
6027         }
6028
6029         if (err) {
6030                 ext4_msg(sb, KERN_ERR, "error loading journal");
6031                 goto err_out;
6032         }
6033
6034         EXT4_SB(sb)->s_journal = journal;
6035         err = ext4_clear_journal_err(sb, es);
6036         if (err) {
6037                 EXT4_SB(sb)->s_journal = NULL;
6038                 jbd2_journal_destroy(journal);
6039                 return err;
6040         }
6041
6042         if (!really_read_only && journal_devnum &&
6043             journal_devnum != le32_to_cpu(es->s_journal_dev)) {
6044                 es->s_journal_dev = cpu_to_le32(journal_devnum);
6045                 ext4_commit_super(sb);
6046         }
6047         if (!really_read_only && journal_inum &&
6048             journal_inum != le32_to_cpu(es->s_journal_inum)) {
6049                 es->s_journal_inum = cpu_to_le32(journal_inum);
6050                 ext4_commit_super(sb);
6051         }
6052
6053         return 0;
6054
6055 err_out:
6056         jbd2_journal_destroy(journal);
6057         return err;
6058 }
6059
6060 /* Copy state of EXT4_SB(sb) into buffer for on-disk superblock */
6061 static void ext4_update_super(struct super_block *sb)
6062 {
6063         struct ext4_sb_info *sbi = EXT4_SB(sb);
6064         struct ext4_super_block *es = sbi->s_es;
6065         struct buffer_head *sbh = sbi->s_sbh;
6066
6067         lock_buffer(sbh);
6068         /*
6069          * If the file system is mounted read-only, don't update the
6070          * superblock write time.  This avoids updating the superblock
6071          * write time when we are mounting the root file system
6072          * read/only but we need to replay the journal; at that point,
6073          * for people who are east of GMT and who make their clock
6074          * tick in localtime for Windows bug-for-bug compatibility,
6075          * the clock is set in the future, and this will cause e2fsck
6076          * to complain and force a full file system check.
6077          */
6078         if (!(sb->s_flags & SB_RDONLY))
6079                 ext4_update_tstamp(es, s_wtime);
6080         es->s_kbytes_written =
6081                 cpu_to_le64(sbi->s_kbytes_written +
6082                     ((part_stat_read(sb->s_bdev, sectors[STAT_WRITE]) -
6083                       sbi->s_sectors_written_start) >> 1));
6084         if (percpu_counter_initialized(&sbi->s_freeclusters_counter))
6085                 ext4_free_blocks_count_set(es,
6086                         EXT4_C2B(sbi, percpu_counter_sum_positive(
6087                                 &sbi->s_freeclusters_counter)));
6088         if (percpu_counter_initialized(&sbi->s_freeinodes_counter))
6089                 es->s_free_inodes_count =
6090                         cpu_to_le32(percpu_counter_sum_positive(
6091                                 &sbi->s_freeinodes_counter));
6092         /* Copy error information to the on-disk superblock */
6093         spin_lock(&sbi->s_error_lock);
6094         if (sbi->s_add_error_count > 0) {
6095                 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
6096                 if (!es->s_first_error_time && !es->s_first_error_time_hi) {
6097                         __ext4_update_tstamp(&es->s_first_error_time,
6098                                              &es->s_first_error_time_hi,
6099                                              sbi->s_first_error_time);
6100                         strncpy(es->s_first_error_func, sbi->s_first_error_func,
6101                                 sizeof(es->s_first_error_func));
6102                         es->s_first_error_line =
6103                                 cpu_to_le32(sbi->s_first_error_line);
6104                         es->s_first_error_ino =
6105                                 cpu_to_le32(sbi->s_first_error_ino);
6106                         es->s_first_error_block =
6107                                 cpu_to_le64(sbi->s_first_error_block);
6108                         es->s_first_error_errcode =
6109                                 ext4_errno_to_code(sbi->s_first_error_code);
6110                 }
6111                 __ext4_update_tstamp(&es->s_last_error_time,
6112                                      &es->s_last_error_time_hi,
6113                                      sbi->s_last_error_time);
6114                 strncpy(es->s_last_error_func, sbi->s_last_error_func,
6115                         sizeof(es->s_last_error_func));
6116                 es->s_last_error_line = cpu_to_le32(sbi->s_last_error_line);
6117                 es->s_last_error_ino = cpu_to_le32(sbi->s_last_error_ino);
6118                 es->s_last_error_block = cpu_to_le64(sbi->s_last_error_block);
6119                 es->s_last_error_errcode =
6120                                 ext4_errno_to_code(sbi->s_last_error_code);
6121                 /*
6122                  * Start the daily error reporting function if it hasn't been
6123                  * started already
6124                  */
6125                 if (!es->s_error_count)
6126                         mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ);
6127                 le32_add_cpu(&es->s_error_count, sbi->s_add_error_count);
6128                 sbi->s_add_error_count = 0;
6129         }
6130         spin_unlock(&sbi->s_error_lock);
6131
6132         ext4_superblock_csum_set(sb);
6133         unlock_buffer(sbh);
6134 }
6135
6136 static int ext4_commit_super(struct super_block *sb)
6137 {
6138         struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
6139
6140         if (!sbh)
6141                 return -EINVAL;
6142         if (block_device_ejected(sb))
6143                 return -ENODEV;
6144
6145         ext4_update_super(sb);
6146
6147         lock_buffer(sbh);
6148         /* Buffer got discarded which means block device got invalidated */
6149         if (!buffer_mapped(sbh)) {
6150                 unlock_buffer(sbh);
6151                 return -EIO;
6152         }
6153
6154         if (buffer_write_io_error(sbh) || !buffer_uptodate(sbh)) {
6155                 /*
6156                  * Oh, dear.  A previous attempt to write the
6157                  * superblock failed.  This could happen because the
6158                  * USB device was yanked out.  Or it could happen to
6159                  * be a transient write error and maybe the block will
6160                  * be remapped.  Nothing we can do but to retry the
6161                  * write and hope for the best.
6162                  */
6163                 ext4_msg(sb, KERN_ERR, "previous I/O error to "
6164                        "superblock detected");
6165                 clear_buffer_write_io_error(sbh);
6166                 set_buffer_uptodate(sbh);
6167         }
6168         get_bh(sbh);
6169         /* Clear potential dirty bit if it was journalled update */
6170         clear_buffer_dirty(sbh);
6171         sbh->b_end_io = end_buffer_write_sync;
6172         submit_bh(REQ_OP_WRITE | REQ_SYNC |
6173                   (test_opt(sb, BARRIER) ? REQ_FUA : 0), sbh);
6174         wait_on_buffer(sbh);
6175         if (buffer_write_io_error(sbh)) {
6176                 ext4_msg(sb, KERN_ERR, "I/O error while writing "
6177                        "superblock");
6178                 clear_buffer_write_io_error(sbh);
6179                 set_buffer_uptodate(sbh);
6180                 return -EIO;
6181         }
6182         return 0;
6183 }
6184
6185 /*
6186  * Have we just finished recovery?  If so, and if we are mounting (or
6187  * remounting) the filesystem readonly, then we will end up with a
6188  * consistent fs on disk.  Record that fact.
6189  */
6190 static int ext4_mark_recovery_complete(struct super_block *sb,
6191                                        struct ext4_super_block *es)
6192 {
6193         int err;
6194         journal_t *journal = EXT4_SB(sb)->s_journal;
6195
6196         if (!ext4_has_feature_journal(sb)) {
6197                 if (journal != NULL) {
6198                         ext4_error(sb, "Journal got removed while the fs was "
6199                                    "mounted!");
6200                         return -EFSCORRUPTED;
6201                 }
6202                 return 0;
6203         }
6204         jbd2_journal_lock_updates(journal);
6205         err = jbd2_journal_flush(journal, 0);
6206         if (err < 0)
6207                 goto out;
6208
6209         if (sb_rdonly(sb) && (ext4_has_feature_journal_needs_recovery(sb) ||
6210             ext4_has_feature_orphan_present(sb))) {
6211                 if (!ext4_orphan_file_empty(sb)) {
6212                         ext4_error(sb, "Orphan file not empty on read-only fs.");
6213                         err = -EFSCORRUPTED;
6214                         goto out;
6215                 }
6216                 ext4_clear_feature_journal_needs_recovery(sb);
6217                 ext4_clear_feature_orphan_present(sb);
6218                 ext4_commit_super(sb);
6219         }
6220 out:
6221         jbd2_journal_unlock_updates(journal);
6222         return err;
6223 }
6224
6225 /*
6226  * If we are mounting (or read-write remounting) a filesystem whose journal
6227  * has recorded an error from a previous lifetime, move that error to the
6228  * main filesystem now.
6229  */
6230 static int ext4_clear_journal_err(struct super_block *sb,
6231                                    struct ext4_super_block *es)
6232 {
6233         journal_t *journal;
6234         int j_errno;
6235         const char *errstr;
6236
6237         if (!ext4_has_feature_journal(sb)) {
6238                 ext4_error(sb, "Journal got removed while the fs was mounted!");
6239                 return -EFSCORRUPTED;
6240         }
6241
6242         journal = EXT4_SB(sb)->s_journal;
6243
6244         /*
6245          * Now check for any error status which may have been recorded in the
6246          * journal by a prior ext4_error() or ext4_abort()
6247          */
6248
6249         j_errno = jbd2_journal_errno(journal);
6250         if (j_errno) {
6251                 char nbuf[16];
6252
6253                 errstr = ext4_decode_error(sb, j_errno, nbuf);
6254                 ext4_warning(sb, "Filesystem error recorded "
6255                              "from previous mount: %s", errstr);
6256
6257                 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
6258                 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
6259                 j_errno = ext4_commit_super(sb);
6260                 if (j_errno)
6261                         return j_errno;
6262                 ext4_warning(sb, "Marked fs in need of filesystem check.");
6263
6264                 jbd2_journal_clear_err(journal);
6265                 jbd2_journal_update_sb_errno(journal);
6266         }
6267         return 0;
6268 }
6269
6270 /*
6271  * Force the running and committing transactions to commit,
6272  * and wait on the commit.
6273  */
6274 int ext4_force_commit(struct super_block *sb)
6275 {
6276         journal_t *journal;
6277
6278         if (sb_rdonly(sb))
6279                 return 0;
6280
6281         journal = EXT4_SB(sb)->s_journal;
6282         return ext4_journal_force_commit(journal);
6283 }
6284
6285 static int ext4_sync_fs(struct super_block *sb, int wait)
6286 {
6287         int ret = 0;
6288         tid_t target;
6289         bool needs_barrier = false;
6290         struct ext4_sb_info *sbi = EXT4_SB(sb);
6291
6292         if (unlikely(ext4_forced_shutdown(sbi)))
6293                 return 0;
6294
6295         trace_ext4_sync_fs(sb, wait);
6296         flush_workqueue(sbi->rsv_conversion_wq);
6297         /*
6298          * Writeback quota in non-journalled quota case - journalled quota has
6299          * no dirty dquots
6300          */
6301         dquot_writeback_dquots(sb, -1);
6302         /*
6303          * Data writeback is possible w/o journal transaction, so barrier must
6304          * being sent at the end of the function. But we can skip it if
6305          * transaction_commit will do it for us.
6306          */
6307         if (sbi->s_journal) {
6308                 target = jbd2_get_latest_transaction(sbi->s_journal);
6309                 if (wait && sbi->s_journal->j_flags & JBD2_BARRIER &&
6310                     !jbd2_trans_will_send_data_barrier(sbi->s_journal, target))
6311                         needs_barrier = true;
6312
6313                 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
6314                         if (wait)
6315                                 ret = jbd2_log_wait_commit(sbi->s_journal,
6316                                                            target);
6317                 }
6318         } else if (wait && test_opt(sb, BARRIER))
6319                 needs_barrier = true;
6320         if (needs_barrier) {
6321                 int err;
6322                 err = blkdev_issue_flush(sb->s_bdev);
6323                 if (!ret)
6324                         ret = err;
6325         }
6326
6327         return ret;
6328 }
6329
6330 /*
6331  * LVM calls this function before a (read-only) snapshot is created.  This
6332  * gives us a chance to flush the journal completely and mark the fs clean.
6333  *
6334  * Note that only this function cannot bring a filesystem to be in a clean
6335  * state independently. It relies on upper layer to stop all data & metadata
6336  * modifications.
6337  */
6338 static int ext4_freeze(struct super_block *sb)
6339 {
6340         int error = 0;
6341         journal_t *journal;
6342
6343         if (sb_rdonly(sb))
6344                 return 0;
6345
6346         journal = EXT4_SB(sb)->s_journal;
6347
6348         if (journal) {
6349                 /* Now we set up the journal barrier. */
6350                 jbd2_journal_lock_updates(journal);
6351
6352                 /*
6353                  * Don't clear the needs_recovery flag if we failed to
6354                  * flush the journal.
6355                  */
6356                 error = jbd2_journal_flush(journal, 0);
6357                 if (error < 0)
6358                         goto out;
6359
6360                 /* Journal blocked and flushed, clear needs_recovery flag. */
6361                 ext4_clear_feature_journal_needs_recovery(sb);
6362                 if (ext4_orphan_file_empty(sb))
6363                         ext4_clear_feature_orphan_present(sb);
6364         }
6365
6366         error = ext4_commit_super(sb);
6367 out:
6368         if (journal)
6369                 /* we rely on upper layer to stop further updates */
6370                 jbd2_journal_unlock_updates(journal);
6371         return error;
6372 }
6373
6374 /*
6375  * Called by LVM after the snapshot is done.  We need to reset the RECOVER
6376  * flag here, even though the filesystem is not technically dirty yet.
6377  */
6378 static int ext4_unfreeze(struct super_block *sb)
6379 {
6380         if (sb_rdonly(sb) || ext4_forced_shutdown(EXT4_SB(sb)))
6381                 return 0;
6382
6383         if (EXT4_SB(sb)->s_journal) {
6384                 /* Reset the needs_recovery flag before the fs is unlocked. */
6385                 ext4_set_feature_journal_needs_recovery(sb);
6386                 if (ext4_has_feature_orphan_file(sb))
6387                         ext4_set_feature_orphan_present(sb);
6388         }
6389
6390         ext4_commit_super(sb);
6391         return 0;
6392 }
6393
6394 /*
6395  * Structure to save mount options for ext4_remount's benefit
6396  */
6397 struct ext4_mount_options {
6398         unsigned long s_mount_opt;
6399         unsigned long s_mount_opt2;
6400         kuid_t s_resuid;
6401         kgid_t s_resgid;
6402         unsigned long s_commit_interval;
6403         u32 s_min_batch_time, s_max_batch_time;
6404 #ifdef CONFIG_QUOTA
6405         int s_jquota_fmt;
6406         char *s_qf_names[EXT4_MAXQUOTAS];
6407 #endif
6408 };
6409
6410 static int __ext4_remount(struct fs_context *fc, struct super_block *sb)
6411 {
6412         struct ext4_fs_context *ctx = fc->fs_private;
6413         struct ext4_super_block *es;
6414         struct ext4_sb_info *sbi = EXT4_SB(sb);
6415         unsigned long old_sb_flags;
6416         struct ext4_mount_options old_opts;
6417         ext4_group_t g;
6418         int err = 0;
6419 #ifdef CONFIG_QUOTA
6420         int enable_quota = 0;
6421         int i, j;
6422         char *to_free[EXT4_MAXQUOTAS];
6423 #endif
6424
6425
6426         /* Store the original options */
6427         old_sb_flags = sb->s_flags;
6428         old_opts.s_mount_opt = sbi->s_mount_opt;
6429         old_opts.s_mount_opt2 = sbi->s_mount_opt2;
6430         old_opts.s_resuid = sbi->s_resuid;
6431         old_opts.s_resgid = sbi->s_resgid;
6432         old_opts.s_commit_interval = sbi->s_commit_interval;
6433         old_opts.s_min_batch_time = sbi->s_min_batch_time;
6434         old_opts.s_max_batch_time = sbi->s_max_batch_time;
6435 #ifdef CONFIG_QUOTA
6436         old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
6437         for (i = 0; i < EXT4_MAXQUOTAS; i++)
6438                 if (sbi->s_qf_names[i]) {
6439                         char *qf_name = get_qf_name(sb, sbi, i);
6440
6441                         old_opts.s_qf_names[i] = kstrdup(qf_name, GFP_KERNEL);
6442                         if (!old_opts.s_qf_names[i]) {
6443                                 for (j = 0; j < i; j++)
6444                                         kfree(old_opts.s_qf_names[j]);
6445                                 return -ENOMEM;
6446                         }
6447                 } else
6448                         old_opts.s_qf_names[i] = NULL;
6449 #endif
6450         if (!(ctx->spec & EXT4_SPEC_JOURNAL_IOPRIO)) {
6451                 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
6452                         ctx->journal_ioprio =
6453                                 sbi->s_journal->j_task->io_context->ioprio;
6454                 else
6455                         ctx->journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
6456
6457         }
6458
6459         ext4_apply_options(fc, sb);
6460
6461         if ((old_opts.s_mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) ^
6462             test_opt(sb, JOURNAL_CHECKSUM)) {
6463                 ext4_msg(sb, KERN_ERR, "changing journal_checksum "
6464                          "during remount not supported; ignoring");
6465                 sbi->s_mount_opt ^= EXT4_MOUNT_JOURNAL_CHECKSUM;
6466         }
6467
6468         if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
6469                 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
6470                         ext4_msg(sb, KERN_ERR, "can't mount with "
6471                                  "both data=journal and delalloc");
6472                         err = -EINVAL;
6473                         goto restore_opts;
6474                 }
6475                 if (test_opt(sb, DIOREAD_NOLOCK)) {
6476                         ext4_msg(sb, KERN_ERR, "can't mount with "
6477                                  "both data=journal and dioread_nolock");
6478                         err = -EINVAL;
6479                         goto restore_opts;
6480                 }
6481         } else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) {
6482                 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
6483                         ext4_msg(sb, KERN_ERR, "can't mount with "
6484                                 "journal_async_commit in data=ordered mode");
6485                         err = -EINVAL;
6486                         goto restore_opts;
6487                 }
6488         }
6489
6490         if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_NO_MBCACHE) {
6491                 ext4_msg(sb, KERN_ERR, "can't enable nombcache during remount");
6492                 err = -EINVAL;
6493                 goto restore_opts;
6494         }
6495
6496         if (ext4_test_mount_flag(sb, EXT4_MF_FS_ABORTED))
6497                 ext4_abort(sb, ESHUTDOWN, "Abort forced by user");
6498
6499         sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
6500                 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0);
6501
6502         es = sbi->s_es;
6503
6504         if (sbi->s_journal) {
6505                 ext4_init_journal_params(sb, sbi->s_journal);
6506                 set_task_ioprio(sbi->s_journal->j_task, ctx->journal_ioprio);
6507         }
6508
6509         /* Flush outstanding errors before changing fs state */
6510         flush_work(&sbi->s_error_work);
6511
6512         if ((bool)(fc->sb_flags & SB_RDONLY) != sb_rdonly(sb)) {
6513                 if (ext4_test_mount_flag(sb, EXT4_MF_FS_ABORTED)) {
6514                         err = -EROFS;
6515                         goto restore_opts;
6516                 }
6517
6518                 if (fc->sb_flags & SB_RDONLY) {
6519                         err = sync_filesystem(sb);
6520                         if (err < 0)
6521                                 goto restore_opts;
6522                         err = dquot_suspend(sb, -1);
6523                         if (err < 0)
6524                                 goto restore_opts;
6525
6526                         /*
6527                          * First of all, the unconditional stuff we have to do
6528                          * to disable replay of the journal when we next remount
6529                          */
6530                         sb->s_flags |= SB_RDONLY;
6531
6532                         /*
6533                          * OK, test if we are remounting a valid rw partition
6534                          * readonly, and if so set the rdonly flag and then
6535                          * mark the partition as valid again.
6536                          */
6537                         if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
6538                             (sbi->s_mount_state & EXT4_VALID_FS))
6539                                 es->s_state = cpu_to_le16(sbi->s_mount_state);
6540
6541                         if (sbi->s_journal) {
6542                                 /*
6543                                  * We let remount-ro finish even if marking fs
6544                                  * as clean failed...
6545                                  */
6546                                 ext4_mark_recovery_complete(sb, es);
6547                         }
6548                 } else {
6549                         /* Make sure we can mount this feature set readwrite */
6550                         if (ext4_has_feature_readonly(sb) ||
6551                             !ext4_feature_set_ok(sb, 0)) {
6552                                 err = -EROFS;
6553                                 goto restore_opts;
6554                         }
6555                         /*
6556                          * Make sure the group descriptor checksums
6557                          * are sane.  If they aren't, refuse to remount r/w.
6558                          */
6559                         for (g = 0; g < sbi->s_groups_count; g++) {
6560                                 struct ext4_group_desc *gdp =
6561                                         ext4_get_group_desc(sb, g, NULL);
6562
6563                                 if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
6564                                         ext4_msg(sb, KERN_ERR,
6565                "ext4_remount: Checksum for group %u failed (%u!=%u)",
6566                 g, le16_to_cpu(ext4_group_desc_csum(sb, g, gdp)),
6567                                                le16_to_cpu(gdp->bg_checksum));
6568                                         err = -EFSBADCRC;
6569                                         goto restore_opts;
6570                                 }
6571                         }
6572
6573                         /*
6574                          * If we have an unprocessed orphan list hanging
6575                          * around from a previously readonly bdev mount,
6576                          * require a full umount/remount for now.
6577                          */
6578                         if (es->s_last_orphan || !ext4_orphan_file_empty(sb)) {
6579                                 ext4_msg(sb, KERN_WARNING, "Couldn't "
6580                                        "remount RDWR because of unprocessed "
6581                                        "orphan inode list.  Please "
6582                                        "umount/remount instead");
6583                                 err = -EINVAL;
6584                                 goto restore_opts;
6585                         }
6586
6587                         /*
6588                          * Mounting a RDONLY partition read-write, so reread
6589                          * and store the current valid flag.  (It may have
6590                          * been changed by e2fsck since we originally mounted
6591                          * the partition.)
6592                          */
6593                         if (sbi->s_journal) {
6594                                 err = ext4_clear_journal_err(sb, es);
6595                                 if (err)
6596                                         goto restore_opts;
6597                         }
6598                         sbi->s_mount_state = (le16_to_cpu(es->s_state) &
6599                                               ~EXT4_FC_REPLAY);
6600
6601                         err = ext4_setup_super(sb, es, 0);
6602                         if (err)
6603                                 goto restore_opts;
6604
6605                         sb->s_flags &= ~SB_RDONLY;
6606                         if (ext4_has_feature_mmp(sb)) {
6607                                 err = ext4_multi_mount_protect(sb,
6608                                                 le64_to_cpu(es->s_mmp_block));
6609                                 if (err)
6610                                         goto restore_opts;
6611                         }
6612 #ifdef CONFIG_QUOTA
6613                         enable_quota = 1;
6614 #endif
6615                 }
6616         }
6617
6618         /*
6619          * Handle creation of system zone data early because it can fail.
6620          * Releasing of existing data is done when we are sure remount will
6621          * succeed.
6622          */
6623         if (test_opt(sb, BLOCK_VALIDITY) && !sbi->s_system_blks) {
6624                 err = ext4_setup_system_zone(sb);
6625                 if (err)
6626                         goto restore_opts;
6627         }
6628
6629         if (sbi->s_journal == NULL && !(old_sb_flags & SB_RDONLY)) {
6630                 err = ext4_commit_super(sb);
6631                 if (err)
6632                         goto restore_opts;
6633         }
6634
6635 #ifdef CONFIG_QUOTA
6636         if (enable_quota) {
6637                 if (sb_any_quota_suspended(sb))
6638                         dquot_resume(sb, -1);
6639                 else if (ext4_has_feature_quota(sb)) {
6640                         err = ext4_enable_quotas(sb);
6641                         if (err)
6642                                 goto restore_opts;
6643                 }
6644         }
6645         /* Release old quota file names */
6646         for (i = 0; i < EXT4_MAXQUOTAS; i++)
6647                 kfree(old_opts.s_qf_names[i]);
6648 #endif
6649         if (!test_opt(sb, BLOCK_VALIDITY) && sbi->s_system_blks)
6650                 ext4_release_system_zone(sb);
6651
6652         /*
6653          * Reinitialize lazy itable initialization thread based on
6654          * current settings
6655          */
6656         if (sb_rdonly(sb) || !test_opt(sb, INIT_INODE_TABLE))
6657                 ext4_unregister_li_request(sb);
6658         else {
6659                 ext4_group_t first_not_zeroed;
6660                 first_not_zeroed = ext4_has_uninit_itable(sb);
6661                 ext4_register_li_request(sb, first_not_zeroed);
6662         }
6663
6664         if (!ext4_has_feature_mmp(sb) || sb_rdonly(sb))
6665                 ext4_stop_mmpd(sbi);
6666
6667         return 0;
6668
6669 restore_opts:
6670         /*
6671          * If there was a failing r/w to ro transition, we may need to
6672          * re-enable quota
6673          */
6674         if ((sb->s_flags & SB_RDONLY) && !(old_sb_flags & SB_RDONLY) &&
6675             sb_any_quota_suspended(sb))
6676                 dquot_resume(sb, -1);
6677         sb->s_flags = old_sb_flags;
6678         sbi->s_mount_opt = old_opts.s_mount_opt;
6679         sbi->s_mount_opt2 = old_opts.s_mount_opt2;
6680         sbi->s_resuid = old_opts.s_resuid;
6681         sbi->s_resgid = old_opts.s_resgid;
6682         sbi->s_commit_interval = old_opts.s_commit_interval;
6683         sbi->s_min_batch_time = old_opts.s_min_batch_time;
6684         sbi->s_max_batch_time = old_opts.s_max_batch_time;
6685         if (!test_opt(sb, BLOCK_VALIDITY) && sbi->s_system_blks)
6686                 ext4_release_system_zone(sb);
6687 #ifdef CONFIG_QUOTA
6688         sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
6689         for (i = 0; i < EXT4_MAXQUOTAS; i++) {
6690                 to_free[i] = get_qf_name(sb, sbi, i);
6691                 rcu_assign_pointer(sbi->s_qf_names[i], old_opts.s_qf_names[i]);
6692         }
6693         synchronize_rcu();
6694         for (i = 0; i < EXT4_MAXQUOTAS; i++)
6695                 kfree(to_free[i]);
6696 #endif
6697         if (!ext4_has_feature_mmp(sb) || sb_rdonly(sb))
6698                 ext4_stop_mmpd(sbi);
6699         return err;
6700 }
6701
6702 static int ext4_reconfigure(struct fs_context *fc)
6703 {
6704         struct super_block *sb = fc->root->d_sb;
6705         int ret;
6706
6707         fc->s_fs_info = EXT4_SB(sb);
6708
6709         ret = ext4_check_opt_consistency(fc, sb);
6710         if (ret < 0)
6711                 return ret;
6712
6713         ret = __ext4_remount(fc, sb);
6714         if (ret < 0)
6715                 return ret;
6716
6717         ext4_msg(sb, KERN_INFO, "re-mounted %pU %s. Quota mode: %s.",
6718                  &sb->s_uuid, sb_rdonly(sb) ? "ro" : "r/w",
6719                  ext4_quota_mode(sb));
6720
6721         return 0;
6722 }
6723
6724 #ifdef CONFIG_QUOTA
6725 static int ext4_statfs_project(struct super_block *sb,
6726                                kprojid_t projid, struct kstatfs *buf)
6727 {
6728         struct kqid qid;
6729         struct dquot *dquot;
6730         u64 limit;
6731         u64 curblock;
6732
6733         qid = make_kqid_projid(projid);
6734         dquot = dqget(sb, qid);
6735         if (IS_ERR(dquot))
6736                 return PTR_ERR(dquot);
6737         spin_lock(&dquot->dq_dqb_lock);
6738
6739         limit = min_not_zero(dquot->dq_dqb.dqb_bsoftlimit,
6740                              dquot->dq_dqb.dqb_bhardlimit);
6741         limit >>= sb->s_blocksize_bits;
6742
6743         if (limit && buf->f_blocks > limit) {
6744                 curblock = (dquot->dq_dqb.dqb_curspace +
6745                             dquot->dq_dqb.dqb_rsvspace) >> sb->s_blocksize_bits;
6746                 buf->f_blocks = limit;
6747                 buf->f_bfree = buf->f_bavail =
6748                         (buf->f_blocks > curblock) ?
6749                          (buf->f_blocks - curblock) : 0;
6750         }
6751
6752         limit = min_not_zero(dquot->dq_dqb.dqb_isoftlimit,
6753                              dquot->dq_dqb.dqb_ihardlimit);
6754         if (limit && buf->f_files > limit) {
6755                 buf->f_files = limit;
6756                 buf->f_ffree =
6757                         (buf->f_files > dquot->dq_dqb.dqb_curinodes) ?
6758                          (buf->f_files - dquot->dq_dqb.dqb_curinodes) : 0;
6759         }
6760
6761         spin_unlock(&dquot->dq_dqb_lock);
6762         dqput(dquot);
6763         return 0;
6764 }
6765 #endif
6766
6767 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
6768 {
6769         struct super_block *sb = dentry->d_sb;
6770         struct ext4_sb_info *sbi = EXT4_SB(sb);
6771         struct ext4_super_block *es = sbi->s_es;
6772         ext4_fsblk_t overhead = 0, resv_blocks;
6773         s64 bfree;
6774         resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
6775
6776         if (!test_opt(sb, MINIX_DF))
6777                 overhead = sbi->s_overhead;
6778
6779         buf->f_type = EXT4_SUPER_MAGIC;
6780         buf->f_bsize = sb->s_blocksize;
6781         buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
6782         bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
6783                 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
6784         /* prevent underflow in case that few free space is available */
6785         buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
6786         buf->f_bavail = buf->f_bfree -
6787                         (ext4_r_blocks_count(es) + resv_blocks);
6788         if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks))
6789                 buf->f_bavail = 0;
6790         buf->f_files = le32_to_cpu(es->s_inodes_count);
6791         buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
6792         buf->f_namelen = EXT4_NAME_LEN;
6793         buf->f_fsid = uuid_to_fsid(es->s_uuid);
6794
6795 #ifdef CONFIG_QUOTA
6796         if (ext4_test_inode_flag(dentry->d_inode, EXT4_INODE_PROJINHERIT) &&
6797             sb_has_quota_limits_enabled(sb, PRJQUOTA))
6798                 ext4_statfs_project(sb, EXT4_I(dentry->d_inode)->i_projid, buf);
6799 #endif
6800         return 0;
6801 }
6802
6803
6804 #ifdef CONFIG_QUOTA
6805
6806 /*
6807  * Helper functions so that transaction is started before we acquire dqio_sem
6808  * to keep correct lock ordering of transaction > dqio_sem
6809  */
6810 static inline struct inode *dquot_to_inode(struct dquot *dquot)
6811 {
6812         return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
6813 }
6814
6815 static int ext4_write_dquot(struct dquot *dquot)
6816 {
6817         int ret, err;
6818         handle_t *handle;
6819         struct inode *inode;
6820
6821         inode = dquot_to_inode(dquot);
6822         handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
6823                                     EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
6824         if (IS_ERR(handle))
6825                 return PTR_ERR(handle);
6826         ret = dquot_commit(dquot);
6827         err = ext4_journal_stop(handle);
6828         if (!ret)
6829                 ret = err;
6830         return ret;
6831 }
6832
6833 static int ext4_acquire_dquot(struct dquot *dquot)
6834 {
6835         int ret, err;
6836         handle_t *handle;
6837
6838         handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
6839                                     EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
6840         if (IS_ERR(handle))
6841                 return PTR_ERR(handle);
6842         ret = dquot_acquire(dquot);
6843         err = ext4_journal_stop(handle);
6844         if (!ret)
6845                 ret = err;
6846         return ret;
6847 }
6848
6849 static int ext4_release_dquot(struct dquot *dquot)
6850 {
6851         int ret, err;
6852         handle_t *handle;
6853
6854         handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
6855                                     EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
6856         if (IS_ERR(handle)) {
6857                 /* Release dquot anyway to avoid endless cycle in dqput() */
6858                 dquot_release(dquot);
6859                 return PTR_ERR(handle);
6860         }
6861         ret = dquot_release(dquot);
6862         err = ext4_journal_stop(handle);
6863         if (!ret)
6864                 ret = err;
6865         return ret;
6866 }
6867
6868 static int ext4_mark_dquot_dirty(struct dquot *dquot)
6869 {
6870         struct super_block *sb = dquot->dq_sb;
6871
6872         if (ext4_is_quota_journalled(sb)) {
6873                 dquot_mark_dquot_dirty(dquot);
6874                 return ext4_write_dquot(dquot);
6875         } else {
6876                 return dquot_mark_dquot_dirty(dquot);
6877         }
6878 }
6879
6880 static int ext4_write_info(struct super_block *sb, int type)
6881 {
6882         int ret, err;
6883         handle_t *handle;
6884
6885         /* Data block + inode block */
6886         handle = ext4_journal_start_sb(sb, EXT4_HT_QUOTA, 2);
6887         if (IS_ERR(handle))
6888                 return PTR_ERR(handle);
6889         ret = dquot_commit_info(sb, type);
6890         err = ext4_journal_stop(handle);
6891         if (!ret)
6892                 ret = err;
6893         return ret;
6894 }
6895
6896 static void lockdep_set_quota_inode(struct inode *inode, int subclass)
6897 {
6898         struct ext4_inode_info *ei = EXT4_I(inode);
6899
6900         /* The first argument of lockdep_set_subclass has to be
6901          * *exactly* the same as the argument to init_rwsem() --- in
6902          * this case, in init_once() --- or lockdep gets unhappy
6903          * because the name of the lock is set using the
6904          * stringification of the argument to init_rwsem().
6905          */
6906         (void) ei;      /* shut up clang warning if !CONFIG_LOCKDEP */
6907         lockdep_set_subclass(&ei->i_data_sem, subclass);
6908 }
6909
6910 /*
6911  * Standard function to be called on quota_on
6912  */
6913 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
6914                          const struct path *path)
6915 {
6916         int err;
6917
6918         if (!test_opt(sb, QUOTA))
6919                 return -EINVAL;
6920
6921         /* Quotafile not on the same filesystem? */
6922         if (path->dentry->d_sb != sb)
6923                 return -EXDEV;
6924
6925         /* Quota already enabled for this file? */
6926         if (IS_NOQUOTA(d_inode(path->dentry)))
6927                 return -EBUSY;
6928
6929         /* Journaling quota? */
6930         if (EXT4_SB(sb)->s_qf_names[type]) {
6931                 /* Quotafile not in fs root? */
6932                 if (path->dentry->d_parent != sb->s_root)
6933                         ext4_msg(sb, KERN_WARNING,
6934                                 "Quota file not on filesystem root. "
6935                                 "Journaled quota will not work");
6936                 sb_dqopt(sb)->flags |= DQUOT_NOLIST_DIRTY;
6937         } else {
6938                 /*
6939                  * Clear the flag just in case mount options changed since
6940                  * last time.
6941                  */
6942                 sb_dqopt(sb)->flags &= ~DQUOT_NOLIST_DIRTY;
6943         }
6944
6945         lockdep_set_quota_inode(path->dentry->d_inode, I_DATA_SEM_QUOTA);
6946         err = dquot_quota_on(sb, type, format_id, path);
6947         if (!err) {
6948                 struct inode *inode = d_inode(path->dentry);
6949                 handle_t *handle;
6950
6951                 /*
6952                  * Set inode flags to prevent userspace from messing with quota
6953                  * files. If this fails, we return success anyway since quotas
6954                  * are already enabled and this is not a hard failure.
6955                  */
6956                 inode_lock(inode);
6957                 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
6958                 if (IS_ERR(handle))
6959                         goto unlock_inode;
6960                 EXT4_I(inode)->i_flags |= EXT4_NOATIME_FL | EXT4_IMMUTABLE_FL;
6961                 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE,
6962                                 S_NOATIME | S_IMMUTABLE);
6963                 err = ext4_mark_inode_dirty(handle, inode);
6964                 ext4_journal_stop(handle);
6965         unlock_inode:
6966                 inode_unlock(inode);
6967                 if (err)
6968                         dquot_quota_off(sb, type);
6969         }
6970         if (err)
6971                 lockdep_set_quota_inode(path->dentry->d_inode,
6972                                              I_DATA_SEM_NORMAL);
6973         return err;
6974 }
6975
6976 static inline bool ext4_check_quota_inum(int type, unsigned long qf_inum)
6977 {
6978         switch (type) {
6979         case USRQUOTA:
6980                 return qf_inum == EXT4_USR_QUOTA_INO;
6981         case GRPQUOTA:
6982                 return qf_inum == EXT4_GRP_QUOTA_INO;
6983         case PRJQUOTA:
6984                 return qf_inum >= EXT4_GOOD_OLD_FIRST_INO;
6985         default:
6986                 BUG();
6987         }
6988 }
6989
6990 static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
6991                              unsigned int flags)
6992 {
6993         int err;
6994         struct inode *qf_inode;
6995         unsigned long qf_inums[EXT4_MAXQUOTAS] = {
6996                 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
6997                 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
6998                 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
6999         };
7000
7001         BUG_ON(!ext4_has_feature_quota(sb));
7002
7003         if (!qf_inums[type])
7004                 return -EPERM;
7005
7006         if (!ext4_check_quota_inum(type, qf_inums[type])) {
7007                 ext4_error(sb, "Bad quota inum: %lu, type: %d",
7008                                 qf_inums[type], type);
7009                 return -EUCLEAN;
7010         }
7011
7012         qf_inode = ext4_iget(sb, qf_inums[type], EXT4_IGET_SPECIAL);
7013         if (IS_ERR(qf_inode)) {
7014                 ext4_error(sb, "Bad quota inode: %lu, type: %d",
7015                                 qf_inums[type], type);
7016                 return PTR_ERR(qf_inode);
7017         }
7018
7019         /* Don't account quota for quota files to avoid recursion */
7020         qf_inode->i_flags |= S_NOQUOTA;
7021         lockdep_set_quota_inode(qf_inode, I_DATA_SEM_QUOTA);
7022         err = dquot_load_quota_inode(qf_inode, type, format_id, flags);
7023         if (err)
7024                 lockdep_set_quota_inode(qf_inode, I_DATA_SEM_NORMAL);
7025         iput(qf_inode);
7026
7027         return err;
7028 }
7029
7030 /* Enable usage tracking for all quota types. */
7031 int ext4_enable_quotas(struct super_block *sb)
7032 {
7033         int type, err = 0;
7034         unsigned long qf_inums[EXT4_MAXQUOTAS] = {
7035                 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
7036                 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
7037                 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
7038         };
7039         bool quota_mopt[EXT4_MAXQUOTAS] = {
7040                 test_opt(sb, USRQUOTA),
7041                 test_opt(sb, GRPQUOTA),
7042                 test_opt(sb, PRJQUOTA),
7043         };
7044
7045         sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE | DQUOT_NOLIST_DIRTY;
7046         for (type = 0; type < EXT4_MAXQUOTAS; type++) {
7047                 if (qf_inums[type]) {
7048                         err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
7049                                 DQUOT_USAGE_ENABLED |
7050                                 (quota_mopt[type] ? DQUOT_LIMITS_ENABLED : 0));
7051                         if (err) {
7052                                 ext4_warning(sb,
7053                                         "Failed to enable quota tracking "
7054                                         "(type=%d, err=%d, ino=%lu). "
7055                                         "Please run e2fsck to fix.", type,
7056                                         err, qf_inums[type]);
7057
7058                                 ext4_quotas_off(sb, type);
7059                                 return err;
7060                         }
7061                 }
7062         }
7063         return 0;
7064 }
7065
7066 static int ext4_quota_off(struct super_block *sb, int type)
7067 {
7068         struct inode *inode = sb_dqopt(sb)->files[type];
7069         handle_t *handle;
7070         int err;
7071
7072         /* Force all delayed allocation blocks to be allocated.
7073          * Caller already holds s_umount sem */
7074         if (test_opt(sb, DELALLOC))
7075                 sync_filesystem(sb);
7076
7077         if (!inode || !igrab(inode))
7078                 goto out;
7079
7080         err = dquot_quota_off(sb, type);
7081         if (err || ext4_has_feature_quota(sb))
7082                 goto out_put;
7083
7084         inode_lock(inode);
7085         /*
7086          * Update modification times of quota files when userspace can
7087          * start looking at them. If we fail, we return success anyway since
7088          * this is not a hard failure and quotas are already disabled.
7089          */
7090         handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
7091         if (IS_ERR(handle)) {
7092                 err = PTR_ERR(handle);
7093                 goto out_unlock;
7094         }
7095         EXT4_I(inode)->i_flags &= ~(EXT4_NOATIME_FL | EXT4_IMMUTABLE_FL);
7096         inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE);
7097         inode->i_mtime = inode->i_ctime = current_time(inode);
7098         err = ext4_mark_inode_dirty(handle, inode);
7099         ext4_journal_stop(handle);
7100 out_unlock:
7101         inode_unlock(inode);
7102 out_put:
7103         lockdep_set_quota_inode(inode, I_DATA_SEM_NORMAL);
7104         iput(inode);
7105         return err;
7106 out:
7107         return dquot_quota_off(sb, type);
7108 }
7109
7110 /* Read data from quotafile - avoid pagecache and such because we cannot afford
7111  * acquiring the locks... As quota files are never truncated and quota code
7112  * itself serializes the operations (and no one else should touch the files)
7113  * we don't have to be afraid of races */
7114 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
7115                                size_t len, loff_t off)
7116 {
7117         struct inode *inode = sb_dqopt(sb)->files[type];
7118         ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
7119         int offset = off & (sb->s_blocksize - 1);
7120         int tocopy;
7121         size_t toread;
7122         struct buffer_head *bh;
7123         loff_t i_size = i_size_read(inode);
7124
7125         if (off > i_size)
7126                 return 0;
7127         if (off+len > i_size)
7128                 len = i_size-off;
7129         toread = len;
7130         while (toread > 0) {
7131                 tocopy = min_t(unsigned long, sb->s_blocksize - offset, toread);
7132                 bh = ext4_bread(NULL, inode, blk, 0);
7133                 if (IS_ERR(bh))
7134                         return PTR_ERR(bh);
7135                 if (!bh)        /* A hole? */
7136                         memset(data, 0, tocopy);
7137                 else
7138                         memcpy(data, bh->b_data+offset, tocopy);
7139                 brelse(bh);
7140                 offset = 0;
7141                 toread -= tocopy;
7142                 data += tocopy;
7143                 blk++;
7144         }
7145         return len;
7146 }
7147
7148 /* Write to quotafile (we know the transaction is already started and has
7149  * enough credits) */
7150 static ssize_t ext4_quota_write(struct super_block *sb, int type,
7151                                 const char *data, size_t len, loff_t off)
7152 {
7153         struct inode *inode = sb_dqopt(sb)->files[type];
7154         ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
7155         int err = 0, err2 = 0, offset = off & (sb->s_blocksize - 1);
7156         int retries = 0;
7157         struct buffer_head *bh;
7158         handle_t *handle = journal_current_handle();
7159
7160         if (!handle) {
7161                 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
7162                         " cancelled because transaction is not started",
7163                         (unsigned long long)off, (unsigned long long)len);
7164                 return -EIO;
7165         }
7166         /*
7167          * Since we account only one data block in transaction credits,
7168          * then it is impossible to cross a block boundary.
7169          */
7170         if (sb->s_blocksize - offset < len) {
7171                 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
7172                         " cancelled because not block aligned",
7173                         (unsigned long long)off, (unsigned long long)len);
7174                 return -EIO;
7175         }
7176
7177         do {
7178                 bh = ext4_bread(handle, inode, blk,
7179                                 EXT4_GET_BLOCKS_CREATE |
7180                                 EXT4_GET_BLOCKS_METADATA_NOFAIL);
7181         } while (PTR_ERR(bh) == -ENOSPC &&
7182                  ext4_should_retry_alloc(inode->i_sb, &retries));
7183         if (IS_ERR(bh))
7184                 return PTR_ERR(bh);
7185         if (!bh)
7186                 goto out;
7187         BUFFER_TRACE(bh, "get write access");
7188         err = ext4_journal_get_write_access(handle, sb, bh, EXT4_JTR_NONE);
7189         if (err) {
7190                 brelse(bh);
7191                 return err;
7192         }
7193         lock_buffer(bh);
7194         memcpy(bh->b_data+offset, data, len);
7195         flush_dcache_page(bh->b_page);
7196         unlock_buffer(bh);
7197         err = ext4_handle_dirty_metadata(handle, NULL, bh);
7198         brelse(bh);
7199 out:
7200         if (inode->i_size < off + len) {
7201                 i_size_write(inode, off + len);
7202                 EXT4_I(inode)->i_disksize = inode->i_size;
7203                 err2 = ext4_mark_inode_dirty(handle, inode);
7204                 if (unlikely(err2 && !err))
7205                         err = err2;
7206         }
7207         return err ? err : len;
7208 }
7209 #endif
7210
7211 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
7212 static inline void register_as_ext2(void)
7213 {
7214         int err = register_filesystem(&ext2_fs_type);
7215         if (err)
7216                 printk(KERN_WARNING
7217                        "EXT4-fs: Unable to register as ext2 (%d)\n", err);
7218 }
7219
7220 static inline void unregister_as_ext2(void)
7221 {
7222         unregister_filesystem(&ext2_fs_type);
7223 }
7224
7225 static inline int ext2_feature_set_ok(struct super_block *sb)
7226 {
7227         if (ext4_has_unknown_ext2_incompat_features(sb))
7228                 return 0;
7229         if (sb_rdonly(sb))
7230                 return 1;
7231         if (ext4_has_unknown_ext2_ro_compat_features(sb))
7232                 return 0;
7233         return 1;
7234 }
7235 #else
7236 static inline void register_as_ext2(void) { }
7237 static inline void unregister_as_ext2(void) { }
7238 static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
7239 #endif
7240
7241 static inline void register_as_ext3(void)
7242 {
7243         int err = register_filesystem(&ext3_fs_type);
7244         if (err)
7245                 printk(KERN_WARNING
7246                        "EXT4-fs: Unable to register as ext3 (%d)\n", err);
7247 }
7248
7249 static inline void unregister_as_ext3(void)
7250 {
7251         unregister_filesystem(&ext3_fs_type);
7252 }
7253
7254 static inline int ext3_feature_set_ok(struct super_block *sb)
7255 {
7256         if (ext4_has_unknown_ext3_incompat_features(sb))
7257                 return 0;
7258         if (!ext4_has_feature_journal(sb))
7259                 return 0;
7260         if (sb_rdonly(sb))
7261                 return 1;
7262         if (ext4_has_unknown_ext3_ro_compat_features(sb))
7263                 return 0;
7264         return 1;
7265 }
7266
7267 static void ext4_kill_sb(struct super_block *sb)
7268 {
7269         struct ext4_sb_info *sbi = EXT4_SB(sb);
7270         struct block_device *journal_bdev = sbi ? sbi->s_journal_bdev : NULL;
7271
7272         kill_block_super(sb);
7273
7274         if (journal_bdev)
7275                 blkdev_put(journal_bdev, sb);
7276 }
7277
7278 static struct file_system_type ext4_fs_type = {
7279         .owner                  = THIS_MODULE,
7280         .name                   = "ext4",
7281         .init_fs_context        = ext4_init_fs_context,
7282         .parameters             = ext4_param_specs,
7283         .kill_sb                = ext4_kill_sb,
7284         .fs_flags               = FS_REQUIRES_DEV | FS_ALLOW_IDMAP,
7285 };
7286 MODULE_ALIAS_FS("ext4");
7287
7288 /* Shared across all ext4 file systems */
7289 wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
7290
7291 static int __init ext4_init_fs(void)
7292 {
7293         int i, err;
7294
7295         ratelimit_state_init(&ext4_mount_msg_ratelimit, 30 * HZ, 64);
7296         ext4_li_info = NULL;
7297
7298         /* Build-time check for flags consistency */
7299         ext4_check_flag_values();
7300
7301         for (i = 0; i < EXT4_WQ_HASH_SZ; i++)
7302                 init_waitqueue_head(&ext4__ioend_wq[i]);
7303
7304         err = ext4_init_es();
7305         if (err)
7306                 return err;
7307
7308         err = ext4_init_pending();
7309         if (err)
7310                 goto out7;
7311
7312         err = ext4_init_post_read_processing();
7313         if (err)
7314                 goto out6;
7315
7316         err = ext4_init_pageio();
7317         if (err)
7318                 goto out5;
7319
7320         err = ext4_init_system_zone();
7321         if (err)
7322                 goto out4;
7323
7324         err = ext4_init_sysfs();
7325         if (err)
7326                 goto out3;
7327
7328         err = ext4_init_mballoc();
7329         if (err)
7330                 goto out2;
7331         err = init_inodecache();
7332         if (err)
7333                 goto out1;
7334
7335         err = ext4_fc_init_dentry_cache();
7336         if (err)
7337                 goto out05;
7338
7339         register_as_ext3();
7340         register_as_ext2();
7341         err = register_filesystem(&ext4_fs_type);
7342         if (err)
7343                 goto out;
7344
7345         return 0;
7346 out:
7347         unregister_as_ext2();
7348         unregister_as_ext3();
7349         ext4_fc_destroy_dentry_cache();
7350 out05:
7351         destroy_inodecache();
7352 out1:
7353         ext4_exit_mballoc();
7354 out2:
7355         ext4_exit_sysfs();
7356 out3:
7357         ext4_exit_system_zone();
7358 out4:
7359         ext4_exit_pageio();
7360 out5:
7361         ext4_exit_post_read_processing();
7362 out6:
7363         ext4_exit_pending();
7364 out7:
7365         ext4_exit_es();
7366
7367         return err;
7368 }
7369
7370 static void __exit ext4_exit_fs(void)
7371 {
7372         ext4_destroy_lazyinit_thread();
7373         unregister_as_ext2();
7374         unregister_as_ext3();
7375         unregister_filesystem(&ext4_fs_type);
7376         ext4_fc_destroy_dentry_cache();
7377         destroy_inodecache();
7378         ext4_exit_mballoc();
7379         ext4_exit_sysfs();
7380         ext4_exit_system_zone();
7381         ext4_exit_pageio();
7382         ext4_exit_post_read_processing();
7383         ext4_exit_es();
7384         ext4_exit_pending();
7385 }
7386
7387 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
7388 MODULE_DESCRIPTION("Fourth Extended Filesystem");
7389 MODULE_LICENSE("GPL");
7390 MODULE_SOFTDEP("pre: crc32c");
7391 module_init(ext4_init_fs)
7392 module_exit(ext4_exit_fs)