fs/ext4/ioctl.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * linux/fs/ext4/ioctl.c
   4  *
   5  * Copyright (C) 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
  11 #include <linux/fs.h>
  12 #include <linux/capability.h>
  13 #include <linux/time.h>
  14 #include <linux/compat.h>
  15 #include <linux/mount.h>
  16 #include <linux/file.h>
  17 #include <linux/quotaops.h>
  18 #include <linux/random.h>
  19 #include <linux/uaccess.h>
  20 #include <linux/delay.h>
  21 #include <linux/iversion.h>
  22 #include <linux/fileattr.h>
  23 #include <linux/uuid.h>
  24 #include "ext4_jbd2.h"
  25 #include "ext4.h"
  26 #include <linux/fsmap.h>
  27 #include "fsmap.h"
  28 #include <trace/events/ext4.h>
  29
  30 typedef void ext4_update_sb_callback(struct ext4_super_block *es,
  31                                        const void *arg);
  32
  33 /*
  34  * Superblock modification callback function for changing file system
  35  * label
  36  */
  37 static void ext4_sb_setlabel(struct ext4_super_block *es, const void *arg)
  38 {
  39         /* Sanity check, this should never happen */
  40         BUILD_BUG_ON(sizeof(es->s_volume_name) < EXT4_LABEL_MAX);
  41
  42         memcpy(es->s_volume_name, (char *)arg, EXT4_LABEL_MAX);
  43 }
  44
  45 /*
  46  * Superblock modification callback function for changing file system
  47  * UUID.
  48  */
  49 static void ext4_sb_setuuid(struct ext4_super_block *es, const void *arg)
  50 {
  51         memcpy(es->s_uuid, (__u8 *)arg, UUID_SIZE);
  52 }
  53
  54 static
  55 int ext4_update_primary_sb(struct super_block *sb, handle_t *handle,
  56                            ext4_update_sb_callback func,
  57                            const void *arg)
  58 {
  59         int err = 0;
  60         struct ext4_sb_info *sbi = EXT4_SB(sb);
  61         struct buffer_head *bh = sbi->s_sbh;
  62         struct ext4_super_block *es = sbi->s_es;
  63
  64         trace_ext4_update_sb(sb, bh->b_blocknr, 1);
  65
  66         BUFFER_TRACE(bh, "get_write_access");
  67         err = ext4_journal_get_write_access(handle, sb,
  68                                             bh,
  69                                             EXT4_JTR_NONE);
  70         if (err)
  71                 goto out_err;
  72
  73         lock_buffer(bh);
  74         func(es, arg);
  75         ext4_superblock_csum_set(sb);
  76         unlock_buffer(bh);
  77
  78         if (buffer_write_io_error(bh) || !buffer_uptodate(bh)) {
  79                 ext4_msg(sbi->s_sb, KERN_ERR, "previous I/O error to "
  80                          "superblock detected");
  81                 clear_buffer_write_io_error(bh);
  82                 set_buffer_uptodate(bh);
  83         }
  84
  85         err = ext4_handle_dirty_metadata(handle, NULL, bh);
  86         if (err)
  87                 goto out_err;
  88         err = sync_dirty_buffer(bh);
  89 out_err:
  90         ext4_std_error(sb, err);
  91         return err;
  92 }
  93
  94 /*
  95  * Update one backup superblock in the group 'grp' using the callback
  96  * function 'func' and argument 'arg'. If the handle is NULL the
  97  * modification is not journalled.
  98  *
  99  * Returns: 0 when no modification was done (no superblock in the group)
 100  *          1 when the modification was successful
 101  *         <0 on error
 102  */
 103 static int ext4_update_backup_sb(struct super_block *sb,
 104                                  handle_t *handle, ext4_group_t grp,
 105                                  ext4_update_sb_callback func, const void *arg)
 106 {
 107         int err = 0;
 108         ext4_fsblk_t sb_block;
 109         struct buffer_head *bh;
 110         unsigned long offset = 0;
 111         struct ext4_super_block *es;
 112
 113         if (!ext4_bg_has_super(sb, grp))
 114                 return 0;
 115
 116         /*
 117          * For the group 0 there is always 1k padding, so we have
 118          * either adjust offset, or sb_block depending on blocksize
 119          */
 120         if (grp == 0) {
 121                 sb_block = 1 * EXT4_MIN_BLOCK_SIZE;
 122                 offset = do_div(sb_block, sb->s_blocksize);
 123         } else {
 124                 sb_block = ext4_group_first_block_no(sb, grp);
 125                 offset = 0;
 126         }
 127
 128         trace_ext4_update_sb(sb, sb_block, handle ? 1 : 0);
 129
 130         bh = ext4_sb_bread(sb, sb_block, 0);
 131         if (IS_ERR(bh))
 132                 return PTR_ERR(bh);
 133
 134         if (handle) {
 135                 BUFFER_TRACE(bh, "get_write_access");
 136                 err = ext4_journal_get_write_access(handle, sb,
 137                                                     bh,
 138                                                     EXT4_JTR_NONE);
 139                 if (err)
 140                         goto out_bh;
 141         }
 142
 143         es = (struct ext4_super_block *) (bh->b_data + offset);
 144         lock_buffer(bh);
 145         if (ext4_has_metadata_csum(sb) &&
 146             es->s_checksum != ext4_superblock_csum(sb, es)) {
 147                 ext4_msg(sb, KERN_ERR, "Invalid checksum for backup "
 148                 "superblock %llu", sb_block);
 149                 unlock_buffer(bh);
 150                 goto out_bh;
 151         }
 152         func(es, arg);
 153         if (ext4_has_metadata_csum(sb))
 154                 es->s_checksum = ext4_superblock_csum(sb, es);
 155         set_buffer_uptodate(bh);
 156         unlock_buffer(bh);
 157
 158         if (handle) {
 159                 err = ext4_handle_dirty_metadata(handle, NULL, bh);
 160                 if (err)
 161                         goto out_bh;
 162         } else {
 163                 BUFFER_TRACE(bh, "marking dirty");
 164                 mark_buffer_dirty(bh);
 165         }
 166         err = sync_dirty_buffer(bh);
 167
 168 out_bh:
 169         brelse(bh);
 170         ext4_std_error(sb, err);
 171         return (err) ? err : 1;
 172 }
 173
 174 /*
 175  * Update primary and backup superblocks using the provided function
 176  * func and argument arg.
 177  *
 178  * Only the primary superblock and at most two backup superblock
 179  * modifications are journalled; the rest is modified without journal.
 180  * This is safe because e2fsck will re-write them if there is a problem,
 181  * and we're very unlikely to ever need more than two backups.
 182  */
 183 static
 184 int ext4_update_superblocks_fn(struct super_block *sb,
 185                                ext4_update_sb_callback func,
 186                                const void *arg)
 187 {
 188         handle_t *handle;
 189         ext4_group_t ngroups;
 190         unsigned int three = 1;
 191         unsigned int five = 5;
 192         unsigned int seven = 7;
 193         int err = 0, ret, i;
 194         ext4_group_t grp, primary_grp;
 195         struct ext4_sb_info *sbi = EXT4_SB(sb);
 196
 197         /*
 198          * We can't update superblocks while the online resize is running
 199          */
 200         if (test_and_set_bit_lock(EXT4_FLAGS_RESIZING,
 201                                   &sbi->s_ext4_flags)) {
 202                 ext4_msg(sb, KERN_ERR, "Can't modify superblock while"
 203                          "performing online resize");
 204                 return -EBUSY;
 205         }
 206
 207         /*
 208          * We're only going to update primary superblock and two
 209          * backup superblocks in this transaction.
 210          */
 211         handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 3);
 212         if (IS_ERR(handle)) {
 213                 err = PTR_ERR(handle);
 214                 goto out;
 215         }
 216
 217         /* Update primary superblock */
 218         err = ext4_update_primary_sb(sb, handle, func, arg);
 219         if (err) {
 220                 ext4_msg(sb, KERN_ERR, "Failed to update primary "
 221                          "superblock");
 222                 goto out_journal;
 223         }
 224
 225         primary_grp = ext4_get_group_number(sb, sbi->s_sbh->b_blocknr);
 226         ngroups = ext4_get_groups_count(sb);
 227
 228         /*
 229          * Update backup superblocks. We have to start from group 0
 230          * because it might not be where the primary superblock is
 231          * if the fs is mounted with -o sb=<backup_sb_block>
 232          */
 233         i = 0;
 234         grp = 0;
 235         while (grp < ngroups) {
 236                 /* Skip primary superblock */
 237                 if (grp == primary_grp)
 238                         goto next_grp;
 239
 240                 ret = ext4_update_backup_sb(sb, handle, grp, func, arg);
 241                 if (ret < 0) {
 242                         /* Ignore bad checksum; try to update next sb */
 243                         if (ret == -EFSBADCRC)
 244                                 goto next_grp;
 245                         err = ret;
 246                         goto out_journal;
 247                 }
 248
 249                 i += ret;
 250                 if (handle && i > 1) {
 251                         /*
 252                          * We're only journalling primary superblock and
 253                          * two backup superblocks; the rest is not
 254                          * journalled.
 255                          */
 256                         err = ext4_journal_stop(handle);
 257                         if (err)
 258                                 goto out;
 259                         handle = NULL;
 260                 }
 261 next_grp:
 262                 grp = ext4_list_backups(sb, &three, &five, &seven);
 263         }
 264
 265 out_journal:
 266         if (handle) {
 267                 ret = ext4_journal_stop(handle);
 268                 if (ret && !err)
 269                         err = ret;
 270         }
 271 out:
 272         clear_bit_unlock(EXT4_FLAGS_RESIZING, &sbi->s_ext4_flags);
 273         smp_mb__after_atomic();
 274         return err ? err : 0;
 275 }
 276
 277 /*
 278  * Swap memory between @a and @b for @len bytes.
 279  *
 280  * @a:          pointer to first memory area
 281  * @b:          pointer to second memory area
 282  * @len:        number of bytes to swap
 283  *
 284  */
 285 static void memswap(void *a, void *b, size_t len)
 286 {
 287         unsigned char *ap, *bp;
 288
 289         ap = (unsigned char *)a;
 290         bp = (unsigned char *)b;
 291         while (len-- > 0) {
 292                 swap(*ap, *bp);
 293                 ap++;
 294                 bp++;
 295         }
 296 }
 297
 298 /*
 299  * Swap i_data and associated attributes between @inode1 and @inode2.
 300  * This function is used for the primary swap between inode1 and inode2
 301  * and also to revert this primary swap in case of errors.
 302  *
 303  * Therefore you have to make sure, that calling this method twice
 304  * will revert all changes.
 305  *
 306  * @inode1:     pointer to first inode
 307  * @inode2:     pointer to second inode
 308  */
 309 static void swap_inode_data(struct inode *inode1, struct inode *inode2)
 310 {
 311         loff_t isize;
 312         struct ext4_inode_info *ei1;
 313         struct ext4_inode_info *ei2;
 314         unsigned long tmp;
 315
 316         ei1 = EXT4_I(inode1);
 317         ei2 = EXT4_I(inode2);
 318
 319         swap(inode1->i_version, inode2->i_version);
 320         swap(inode1->i_atime, inode2->i_atime);
 321         swap(inode1->i_mtime, inode2->i_mtime);
 322
 323         memswap(ei1->i_data, ei2->i_data, sizeof(ei1->i_data));
 324         tmp = ei1->i_flags & EXT4_FL_SHOULD_SWAP;
 325         ei1->i_flags = (ei2->i_flags & EXT4_FL_SHOULD_SWAP) |
 326                 (ei1->i_flags & ~EXT4_FL_SHOULD_SWAP);
 327         ei2->i_flags = tmp | (ei2->i_flags & ~EXT4_FL_SHOULD_SWAP);
 328         swap(ei1->i_disksize, ei2->i_disksize);
 329         ext4_es_remove_extent(inode1, 0, EXT_MAX_BLOCKS);
 330         ext4_es_remove_extent(inode2, 0, EXT_MAX_BLOCKS);
 331
 332         isize = i_size_read(inode1);
 333         i_size_write(inode1, i_size_read(inode2));
 334         i_size_write(inode2, isize);
 335 }
 336
 337 void ext4_reset_inode_seed(struct inode *inode)
 338 {
 339         struct ext4_inode_info *ei = EXT4_I(inode);
 340         struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
 341         __le32 inum = cpu_to_le32(inode->i_ino);
 342         __le32 gen = cpu_to_le32(inode->i_generation);
 343         __u32 csum;
 344
 345         if (!ext4_has_metadata_csum(inode->i_sb))
 346                 return;
 347
 348         csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&inum, sizeof(inum));
 349         ei->i_csum_seed = ext4_chksum(sbi, csum, (__u8 *)&gen, sizeof(gen));
 350 }
 351
 352 /*
 353  * Swap the information from the given @inode and the inode
 354  * EXT4_BOOT_LOADER_INO. It will basically swap i_data and all other
 355  * important fields of the inodes.
 356  *
 357  * @sb:         the super block of the filesystem
 358  * @idmap:      idmap of the mount the inode was found from
 359  * @inode:      the inode to swap with EXT4_BOOT_LOADER_INO
 360  *
 361  */
 362 static long swap_inode_boot_loader(struct super_block *sb,
 363                                 struct mnt_idmap *idmap,
 364                                 struct inode *inode)
 365 {
 366         handle_t *handle;
 367         int err;
 368         struct inode *inode_bl;
 369         struct ext4_inode_info *ei_bl;
 370         qsize_t size, size_bl, diff;
 371         blkcnt_t blocks;
 372         unsigned short bytes;
 373
 374         inode_bl = ext4_iget(sb, EXT4_BOOT_LOADER_INO,
 375                         EXT4_IGET_SPECIAL | EXT4_IGET_BAD);
 376         if (IS_ERR(inode_bl))
 377                 return PTR_ERR(inode_bl);
 378         ei_bl = EXT4_I(inode_bl);
 379
 380         /* Protect orig inodes against a truncate and make sure,
 381          * that only 1 swap_inode_boot_loader is running. */
 382         lock_two_nondirectories(inode, inode_bl);
 383
 384         if (inode->i_nlink != 1 || !S_ISREG(inode->i_mode) ||
 385             IS_SWAPFILE(inode) || IS_ENCRYPTED(inode) ||
 386             (EXT4_I(inode)->i_flags & EXT4_JOURNAL_DATA_FL) ||
 387             ext4_has_inline_data(inode)) {
 388                 err = -EINVAL;
 389                 goto journal_err_out;
 390         }
 391
 392         if (IS_RDONLY(inode) || IS_APPEND(inode) || IS_IMMUTABLE(inode) ||
 393             !inode_owner_or_capable(idmap, inode) ||
 394             !capable(CAP_SYS_ADMIN)) {
 395                 err = -EPERM;
 396                 goto journal_err_out;
 397         }
 398
 399         filemap_invalidate_lock(inode->i_mapping);
 400         err = filemap_write_and_wait(inode->i_mapping);
 401         if (err)
 402                 goto err_out;
 403
 404         err = filemap_write_and_wait(inode_bl->i_mapping);
 405         if (err)
 406                 goto err_out;
 407
 408         /* Wait for all existing dio workers */
 409         inode_dio_wait(inode);
 410         inode_dio_wait(inode_bl);
 411
 412         truncate_inode_pages(&inode->i_data, 0);
 413         truncate_inode_pages(&inode_bl->i_data, 0);
 414
 415         handle = ext4_journal_start(inode_bl, EXT4_HT_MOVE_EXTENTS, 2);
 416         if (IS_ERR(handle)) {
 417                 err = -EINVAL;
 418                 goto err_out;
 419         }
 420         ext4_fc_mark_ineligible(sb, EXT4_FC_REASON_SWAP_BOOT, handle);
 421
 422         /* Protect extent tree against block allocations via delalloc */
 423         ext4_double_down_write_data_sem(inode, inode_bl);
 424
 425         if (is_bad_inode(inode_bl) || !S_ISREG(inode_bl->i_mode)) {
 426                 /* this inode has never been used as a BOOT_LOADER */
 427                 set_nlink(inode_bl, 1);
 428                 i_uid_write(inode_bl, 0);
 429                 i_gid_write(inode_bl, 0);
 430                 inode_bl->i_flags = 0;
 431                 ei_bl->i_flags = 0;
 432                 inode_set_iversion(inode_bl, 1);
 433                 i_size_write(inode_bl, 0);
 434                 EXT4_I(inode_bl)->i_disksize = inode_bl->i_size;
 435                 inode_bl->i_mode = S_IFREG;
 436                 if (ext4_has_feature_extents(sb)) {
 437                         ext4_set_inode_flag(inode_bl, EXT4_INODE_EXTENTS);
 438                         ext4_ext_tree_init(handle, inode_bl);
 439                 } else
 440                         memset(ei_bl->i_data, 0, sizeof(ei_bl->i_data));
 441         }
 442
 443         err = dquot_initialize(inode);
 444         if (err)
 445                 goto err_out1;
 446
 447         size = (qsize_t)(inode->i_blocks) * (1 << 9) + inode->i_bytes;
 448         size_bl = (qsize_t)(inode_bl->i_blocks) * (1 << 9) + inode_bl->i_bytes;
 449         diff = size - size_bl;
 450         swap_inode_data(inode, inode_bl);
 451
 452         inode_set_ctime_current(inode);
 453         inode_set_ctime_current(inode_bl);
 454         inode_inc_iversion(inode);
 455
 456         inode->i_generation = get_random_u32();
 457         inode_bl->i_generation = get_random_u32();
 458         ext4_reset_inode_seed(inode);
 459         ext4_reset_inode_seed(inode_bl);
 460
 461         ext4_discard_preallocations(inode, 0);
 462
 463         err = ext4_mark_inode_dirty(handle, inode);
 464         if (err < 0) {
 465                 /* No need to update quota information. */
 466                 ext4_warning(inode->i_sb,
 467                         "couldn't mark inode #%lu dirty (err %d)",
 468                         inode->i_ino, err);
 469                 /* Revert all changes: */
 470                 swap_inode_data(inode, inode_bl);
 471                 ext4_mark_inode_dirty(handle, inode);
 472                 goto err_out1;
 473         }
 474
 475         blocks = inode_bl->i_blocks;
 476         bytes = inode_bl->i_bytes;
 477         inode_bl->i_blocks = inode->i_blocks;
 478         inode_bl->i_bytes = inode->i_bytes;
 479         err = ext4_mark_inode_dirty(handle, inode_bl);
 480         if (err < 0) {
 481                 /* No need to update quota information. */
 482                 ext4_warning(inode_bl->i_sb,
 483                         "couldn't mark inode #%lu dirty (err %d)",
 484                         inode_bl->i_ino, err);
 485                 goto revert;
 486         }
 487
 488         /* Bootloader inode should not be counted into quota information. */
 489         if (diff > 0)
 490                 dquot_free_space(inode, diff);
 491         else
 492                 err = dquot_alloc_space(inode, -1 * diff);
 493
 494         if (err < 0) {
 495 revert:
 496                 /* Revert all changes: */
 497                 inode_bl->i_blocks = blocks;
 498                 inode_bl->i_bytes = bytes;
 499                 swap_inode_data(inode, inode_bl);
 500                 ext4_mark_inode_dirty(handle, inode);
 501                 ext4_mark_inode_dirty(handle, inode_bl);
 502         }
 503
 504 err_out1:
 505         ext4_journal_stop(handle);
 506         ext4_double_up_write_data_sem(inode, inode_bl);
 507
 508 err_out:
 509         filemap_invalidate_unlock(inode->i_mapping);
 510 journal_err_out:
 511         unlock_two_nondirectories(inode, inode_bl);
 512         iput(inode_bl);
 513         return err;
 514 }
 515
 516 /*
 517  * If immutable is set and we are not clearing it, we're not allowed to change
 518  * anything else in the inode.  Don't error out if we're only trying to set
 519  * immutable on an immutable file.
 520  */
 521 static int ext4_ioctl_check_immutable(struct inode *inode, __u32 new_projid,
 522                                       unsigned int flags)
 523 {
 524         struct ext4_inode_info *ei = EXT4_I(inode);
 525         unsigned int oldflags = ei->i_flags;
 526
 527         if (!(oldflags & EXT4_IMMUTABLE_FL) || !(flags & EXT4_IMMUTABLE_FL))
 528                 return 0;
 529
 530         if ((oldflags & ~EXT4_IMMUTABLE_FL) != (flags & ~EXT4_IMMUTABLE_FL))
 531                 return -EPERM;
 532         if (ext4_has_feature_project(inode->i_sb) &&
 533             __kprojid_val(ei->i_projid) != new_projid)
 534                 return -EPERM;
 535
 536         return 0;
 537 }
 538
 539 static void ext4_dax_dontcache(struct inode *inode, unsigned int flags)
 540 {
 541         struct ext4_inode_info *ei = EXT4_I(inode);
 542
 543         if (S_ISDIR(inode->i_mode))
 544                 return;
 545
 546         if (test_opt2(inode->i_sb, DAX_NEVER) ||
 547             test_opt(inode->i_sb, DAX_ALWAYS))
 548                 return;
 549
 550         if ((ei->i_flags ^ flags) & EXT4_DAX_FL)
 551                 d_mark_dontcache(inode);
 552 }
 553
 554 static bool dax_compatible(struct inode *inode, unsigned int oldflags,
 555                            unsigned int flags)
 556 {
 557         /* Allow the DAX flag to be changed on inline directories */
 558         if (S_ISDIR(inode->i_mode)) {
 559                 flags &= ~EXT4_INLINE_DATA_FL;
 560                 oldflags &= ~EXT4_INLINE_DATA_FL;
 561         }
 562
 563         if (flags & EXT4_DAX_FL) {
 564                 if ((oldflags & EXT4_DAX_MUT_EXCL) ||
 565                      ext4_test_inode_state(inode,
 566                                           EXT4_STATE_VERITY_IN_PROGRESS)) {
 567                         return false;
 568                 }
 569         }
 570
 571         if ((flags & EXT4_DAX_MUT_EXCL) && (oldflags & EXT4_DAX_FL))
 572                         return false;
 573
 574         return true;
 575 }
 576
 577 static int ext4_ioctl_setflags(struct inode *inode,
 578                                unsigned int flags)
 579 {
 580         struct ext4_inode_info *ei = EXT4_I(inode);
 581         handle_t *handle = NULL;
 582         int err = -EPERM, migrate = 0;
 583         struct ext4_iloc iloc;
 584         unsigned int oldflags, mask, i;
 585         struct super_block *sb = inode->i_sb;
 586
 587         /* Is it quota file? Do not allow user to mess with it */
 588         if (ext4_is_quota_file(inode))
 589                 goto flags_out;
 590
 591         oldflags = ei->i_flags;
 592         /*
 593          * The JOURNAL_DATA flag can only be changed by
 594          * the relevant capability.
 595          */
 596         if ((flags ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
 597                 if (!capable(CAP_SYS_RESOURCE))
 598                         goto flags_out;
 599         }
 600
 601         if (!dax_compatible(inode, oldflags, flags)) {
 602                 err = -EOPNOTSUPP;
 603                 goto flags_out;
 604         }
 605
 606         if ((flags ^ oldflags) & EXT4_EXTENTS_FL)
 607                 migrate = 1;
 608
 609         if ((flags ^ oldflags) & EXT4_CASEFOLD_FL) {
 610                 if (!ext4_has_feature_casefold(sb)) {
 611                         err = -EOPNOTSUPP;
 612                         goto flags_out;
 613                 }
 614
 615                 if (!S_ISDIR(inode->i_mode)) {
 616                         err = -ENOTDIR;
 617                         goto flags_out;
 618                 }
 619
 620                 if (!ext4_empty_dir(inode)) {
 621                         err = -ENOTEMPTY;
 622                         goto flags_out;
 623                 }
 624         }
 625
 626         /*
 627          * Wait for all pending directio and then flush all the dirty pages
 628          * for this file.  The flush marks all the pages readonly, so any
 629          * subsequent attempt to write to the file (particularly mmap pages)
 630          * will come through the filesystem and fail.
 631          */
 632         if (S_ISREG(inode->i_mode) && !IS_IMMUTABLE(inode) &&
 633             (flags & EXT4_IMMUTABLE_FL)) {
 634                 inode_dio_wait(inode);
 635                 err = filemap_write_and_wait(inode->i_mapping);
 636                 if (err)
 637                         goto flags_out;
 638         }
 639
 640         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 641         if (IS_ERR(handle)) {
 642                 err = PTR_ERR(handle);
 643                 goto flags_out;
 644         }
 645         if (IS_SYNC(inode))
 646                 ext4_handle_sync(handle);
 647         err = ext4_reserve_inode_write(handle, inode, &iloc);
 648         if (err)
 649                 goto flags_err;
 650
 651         ext4_dax_dontcache(inode, flags);
 652
 653         for (i = 0, mask = 1; i < 32; i++, mask <<= 1) {
 654                 if (!(mask & EXT4_FL_USER_MODIFIABLE))
 655                         continue;
 656                 /* These flags get special treatment later */
 657                 if (mask == EXT4_JOURNAL_DATA_FL || mask == EXT4_EXTENTS_FL)
 658                         continue;
 659                 if (mask & flags)
 660                         ext4_set_inode_flag(inode, i);
 661                 else
 662                         ext4_clear_inode_flag(inode, i);
 663         }
 664
 665         ext4_set_inode_flags(inode, false);
 666
 667         inode_set_ctime_current(inode);
 668         inode_inc_iversion(inode);
 669
 670         err = ext4_mark_iloc_dirty(handle, inode, &iloc);
 671 flags_err:
 672         ext4_journal_stop(handle);
 673         if (err)
 674                 goto flags_out;
 675
 676         if ((flags ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
 677                 /*
 678                  * Changes to the journaling mode can cause unsafe changes to
 679                  * S_DAX if the inode is DAX
 680                  */
 681                 if (IS_DAX(inode)) {
 682                         err = -EBUSY;
 683                         goto flags_out;
 684                 }
 685
 686                 err = ext4_change_inode_journal_flag(inode,
 687                                                      flags & EXT4_JOURNAL_DATA_FL);
 688                 if (err)
 689                         goto flags_out;
 690         }
 691         if (migrate) {
 692                 if (flags & EXT4_EXTENTS_FL)
 693                         err = ext4_ext_migrate(inode);
 694                 else
 695                         err = ext4_ind_migrate(inode);
 696         }
 697
 698 flags_out:
 699         return err;
 700 }
 701
 702 #ifdef CONFIG_QUOTA
 703 static int ext4_ioctl_setproject(struct inode *inode, __u32 projid)
 704 {
 705         struct super_block *sb = inode->i_sb;
 706         struct ext4_inode_info *ei = EXT4_I(inode);
 707         int err, rc;
 708         handle_t *handle;
 709         kprojid_t kprojid;
 710         struct ext4_iloc iloc;
 711         struct ext4_inode *raw_inode;
 712         struct dquot *transfer_to[MAXQUOTAS] = { };
 713
 714         if (!ext4_has_feature_project(sb)) {
 715                 if (projid != EXT4_DEF_PROJID)
 716                         return -EOPNOTSUPP;
 717                 else
 718                         return 0;
 719         }
 720
 721         if (EXT4_INODE_SIZE(sb) <= EXT4_GOOD_OLD_INODE_SIZE)
 722                 return -EOPNOTSUPP;
 723
 724         kprojid = make_kprojid(&init_user_ns, (projid_t)projid);
 725
 726         if (projid_eq(kprojid, EXT4_I(inode)->i_projid))
 727                 return 0;
 728
 729         err = -EPERM;
 730         /* Is it quota file? Do not allow user to mess with it */
 731         if (ext4_is_quota_file(inode))
 732                 return err;
 733
 734         err = dquot_initialize(inode);
 735         if (err)
 736                 return err;
 737
 738         err = ext4_get_inode_loc(inode, &iloc);
 739         if (err)
 740                 return err;
 741
 742         raw_inode = ext4_raw_inode(&iloc);
 743         if (!EXT4_FITS_IN_INODE(raw_inode, ei, i_projid)) {
 744                 err = ext4_expand_extra_isize(inode,
 745                                               EXT4_SB(sb)->s_want_extra_isize,
 746                                               &iloc);
 747                 if (err)
 748                         return err;
 749         } else {
 750                 brelse(iloc.bh);
 751         }
 752
 753         handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
 754                 EXT4_QUOTA_INIT_BLOCKS(sb) +
 755                 EXT4_QUOTA_DEL_BLOCKS(sb) + 3);
 756         if (IS_ERR(handle))
 757                 return PTR_ERR(handle);
 758
 759         err = ext4_reserve_inode_write(handle, inode, &iloc);
 760         if (err)
 761                 goto out_stop;
 762
 763         transfer_to[PRJQUOTA] = dqget(sb, make_kqid_projid(kprojid));
 764         if (!IS_ERR(transfer_to[PRJQUOTA])) {
 765
 766                 /* __dquot_transfer() calls back ext4_get_inode_usage() which
 767                  * counts xattr inode references.
 768                  */
 769                 down_read(&EXT4_I(inode)->xattr_sem);
 770                 err = __dquot_transfer(inode, transfer_to);
 771                 up_read(&EXT4_I(inode)->xattr_sem);
 772                 dqput(transfer_to[PRJQUOTA]);
 773                 if (err)
 774                         goto out_dirty;
 775         }
 776
 777         EXT4_I(inode)->i_projid = kprojid;
 778         inode_set_ctime_current(inode);
 779         inode_inc_iversion(inode);
 780 out_dirty:
 781         rc = ext4_mark_iloc_dirty(handle, inode, &iloc);
 782         if (!err)
 783                 err = rc;
 784 out_stop:
 785         ext4_journal_stop(handle);
 786         return err;
 787 }
 788 #else
 789 static int ext4_ioctl_setproject(struct inode *inode, __u32 projid)
 790 {
 791         if (projid != EXT4_DEF_PROJID)
 792                 return -EOPNOTSUPP;
 793         return 0;
 794 }
 795 #endif
 796
 797 int ext4_force_shutdown(struct super_block *sb, u32 flags)
 798 {
 799         struct ext4_sb_info *sbi = EXT4_SB(sb);
 800         int ret;
 801
 802         if (flags > EXT4_GOING_FLAGS_NOLOGFLUSH)
 803                 return -EINVAL;
 804
 805         if (ext4_forced_shutdown(sb))
 806                 return 0;
 807
 808         ext4_msg(sb, KERN_ALERT, "shut down requested (%d)", flags);
 809         trace_ext4_shutdown(sb, flags);
 810
 811         switch (flags) {
 812         case EXT4_GOING_FLAGS_DEFAULT:
 813                 ret = freeze_bdev(sb->s_bdev);
 814                 if (ret)
 815                         return ret;
 816                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 817                 thaw_bdev(sb->s_bdev);
 818                 break;
 819         case EXT4_GOING_FLAGS_LOGFLUSH:
 820                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 821                 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal)) {
 822                         (void) ext4_force_commit(sb);
 823                         jbd2_journal_abort(sbi->s_journal, -ESHUTDOWN);
 824                 }
 825                 break;
 826         case EXT4_GOING_FLAGS_NOLOGFLUSH:
 827                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 828                 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal))
 829                         jbd2_journal_abort(sbi->s_journal, -ESHUTDOWN);
 830                 break;
 831         default:
 832                 return -EINVAL;
 833         }
 834         clear_opt(sb, DISCARD);
 835         return 0;
 836 }
 837
 838 static int ext4_ioctl_shutdown(struct super_block *sb, unsigned long arg)
 839 {
 840         u32 flags;
 841
 842         if (!capable(CAP_SYS_ADMIN))
 843                 return -EPERM;
 844
 845         if (get_user(flags, (__u32 __user *)arg))
 846                 return -EFAULT;
 847
 848         return ext4_force_shutdown(sb, flags);
 849 }
 850
 851 struct getfsmap_info {
 852         struct super_block      *gi_sb;
 853         struct fsmap_head __user *gi_data;
 854         unsigned int            gi_idx;
 855         __u32                   gi_last_flags;
 856 };
 857
 858 static int ext4_getfsmap_format(struct ext4_fsmap *xfm, void *priv)
 859 {
 860         struct getfsmap_info *info = priv;
 861         struct fsmap fm;
 862
 863         trace_ext4_getfsmap_mapping(info->gi_sb, xfm);
 864
 865         info->gi_last_flags = xfm->fmr_flags;
 866         ext4_fsmap_from_internal(info->gi_sb, &fm, xfm);
 867         if (copy_to_user(&info->gi_data->fmh_recs[info->gi_idx++], &fm,
 868                         sizeof(struct fsmap)))
 869                 return -EFAULT;
 870
 871         return 0;
 872 }
 873
 874 static int ext4_ioc_getfsmap(struct super_block *sb,
 875                              struct fsmap_head __user *arg)
 876 {
 877         struct getfsmap_info info = { NULL };
 878         struct ext4_fsmap_head xhead = {0};
 879         struct fsmap_head head;
 880         bool aborted = false;
 881         int error;
 882
 883         if (copy_from_user(&head, arg, sizeof(struct fsmap_head)))
 884                 return -EFAULT;
 885         if (memchr_inv(head.fmh_reserved, 0, sizeof(head.fmh_reserved)) ||
 886             memchr_inv(head.fmh_keys[0].fmr_reserved, 0,
 887                        sizeof(head.fmh_keys[0].fmr_reserved)) ||
 888             memchr_inv(head.fmh_keys[1].fmr_reserved, 0,
 889                        sizeof(head.fmh_keys[1].fmr_reserved)))
 890                 return -EINVAL;
 891         /*
 892          * ext4 doesn't report file extents at all, so the only valid
 893          * file offsets are the magic ones (all zeroes or all ones).
 894          */
 895         if (head.fmh_keys[0].fmr_offset ||
 896             (head.fmh_keys[1].fmr_offset != 0 &&
 897              head.fmh_keys[1].fmr_offset != -1ULL))
 898                 return -EINVAL;
 899
 900         xhead.fmh_iflags = head.fmh_iflags;
 901         xhead.fmh_count = head.fmh_count;
 902         ext4_fsmap_to_internal(sb, &xhead.fmh_keys[0], &head.fmh_keys[0]);
 903         ext4_fsmap_to_internal(sb, &xhead.fmh_keys[1], &head.fmh_keys[1]);
 904
 905         trace_ext4_getfsmap_low_key(sb, &xhead.fmh_keys[0]);
 906         trace_ext4_getfsmap_high_key(sb, &xhead.fmh_keys[1]);
 907
 908         info.gi_sb = sb;
 909         info.gi_data = arg;
 910         error = ext4_getfsmap(sb, &xhead, ext4_getfsmap_format, &info);
 911         if (error == EXT4_QUERY_RANGE_ABORT)
 912                 aborted = true;
 913         else if (error)
 914                 return error;
 915
 916         /* If we didn't abort, set the "last" flag in the last fmx */
 917         if (!aborted && info.gi_idx) {
 918                 info.gi_last_flags |= FMR_OF_LAST;
 919                 if (copy_to_user(&info.gi_data->fmh_recs[info.gi_idx - 1].fmr_flags,
 920                                  &info.gi_last_flags,
 921                                  sizeof(info.gi_last_flags)))
 922                         return -EFAULT;
 923         }
 924
 925         /* copy back header */
 926         head.fmh_entries = xhead.fmh_entries;
 927         head.fmh_oflags = xhead.fmh_oflags;
 928         if (copy_to_user(arg, &head, sizeof(struct fsmap_head)))
 929                 return -EFAULT;
 930
 931         return 0;
 932 }
 933
 934 static long ext4_ioctl_group_add(struct file *file,
 935                                  struct ext4_new_group_data *input)
 936 {
 937         struct super_block *sb = file_inode(file)->i_sb;
 938         int err, err2=0;
 939
 940         err = ext4_resize_begin(sb);
 941         if (err)
 942                 return err;
 943
 944         if (ext4_has_feature_bigalloc(sb)) {
 945                 ext4_msg(sb, KERN_ERR,
 946                          "Online resizing not supported with bigalloc");
 947                 err = -EOPNOTSUPP;
 948                 goto group_add_out;
 949         }
 950
 951         err = mnt_want_write_file(file);
 952         if (err)
 953                 goto group_add_out;
 954
 955         err = ext4_group_add(sb, input);
 956         if (EXT4_SB(sb)->s_journal) {
 957                 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 958                 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal, 0);
 959                 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 960         }
 961         if (err == 0)
 962                 err = err2;
 963         mnt_drop_write_file(file);
 964         if (!err && ext4_has_group_desc_csum(sb) &&
 965             test_opt(sb, INIT_INODE_TABLE))
 966                 err = ext4_register_li_request(sb, input->group);
 967 group_add_out:
 968         err2 = ext4_resize_end(sb, false);
 969         if (err == 0)
 970                 err = err2;
 971         return err;
 972 }
 973
 974 int ext4_fileattr_get(struct dentry *dentry, struct fileattr *fa)
 975 {
 976         struct inode *inode = d_inode(dentry);
 977         struct ext4_inode_info *ei = EXT4_I(inode);
 978         u32 flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
 979
 980         if (S_ISREG(inode->i_mode))
 981                 flags &= ~FS_PROJINHERIT_FL;
 982
 983         fileattr_fill_flags(fa, flags);
 984         if (ext4_has_feature_project(inode->i_sb))
 985                 fa->fsx_projid = from_kprojid(&init_user_ns, ei->i_projid);
 986
 987         return 0;
 988 }
 989
 990 int ext4_fileattr_set(struct mnt_idmap *idmap,
 991                       struct dentry *dentry, struct fileattr *fa)
 992 {
 993         struct inode *inode = d_inode(dentry);
 994         u32 flags = fa->flags;
 995         int err = -EOPNOTSUPP;
 996
 997         if (flags & ~EXT4_FL_USER_VISIBLE)
 998                 goto out;
 999
1000         /*
1001          * chattr(1) grabs flags via GETFLAGS, modifies the result and
1002          * passes that to SETFLAGS. So we cannot easily make SETFLAGS
1003          * more restrictive than just silently masking off visible but
1004          * not settable flags as we always did.
1005          */
1006         flags &= EXT4_FL_USER_MODIFIABLE;
1007         if (ext4_mask_flags(inode->i_mode, flags) != flags)
1008                 goto out;
1009         err = ext4_ioctl_check_immutable(inode, fa->fsx_projid, flags);
1010         if (err)
1011                 goto out;
1012         err = ext4_ioctl_setflags(inode, flags);
1013         if (err)
1014                 goto out;
1015         err = ext4_ioctl_setproject(inode, fa->fsx_projid);
1016 out:
1017         return err;
1018 }
1019
1020 /* So that the fiemap access checks can't overflow on 32 bit machines. */
1021 #define FIEMAP_MAX_EXTENTS      (UINT_MAX / sizeof(struct fiemap_extent))
1022
1023 static int ext4_ioctl_get_es_cache(struct file *filp, unsigned long arg)
1024 {
1025         struct fiemap fiemap;
1026         struct fiemap __user *ufiemap = (struct fiemap __user *) arg;
1027         struct fiemap_extent_info fieinfo = { 0, };
1028         struct inode *inode = file_inode(filp);
1029         int error;
1030
1031         if (copy_from_user(&fiemap, ufiemap, sizeof(fiemap)))
1032                 return -EFAULT;
1033
1034         if (fiemap.fm_extent_count > FIEMAP_MAX_EXTENTS)
1035                 return -EINVAL;
1036
1037         fieinfo.fi_flags = fiemap.fm_flags;
1038         fieinfo.fi_extents_max = fiemap.fm_extent_count;
1039         fieinfo.fi_extents_start = ufiemap->fm_extents;
1040
1041         error = ext4_get_es_cache(inode, &fieinfo, fiemap.fm_start,
1042                         fiemap.fm_length);
1043         fiemap.fm_flags = fieinfo.fi_flags;
1044         fiemap.fm_mapped_extents = fieinfo.fi_extents_mapped;
1045         if (copy_to_user(ufiemap, &fiemap, sizeof(fiemap)))
1046                 error = -EFAULT;
1047
1048         return error;
1049 }
1050
1051 static int ext4_ioctl_checkpoint(struct file *filp, unsigned long arg)
1052 {
1053         int err = 0;
1054         __u32 flags = 0;
1055         unsigned int flush_flags = 0;
1056         struct super_block *sb = file_inode(filp)->i_sb;
1057
1058         if (copy_from_user(&flags, (__u32 __user *)arg,
1059                                 sizeof(__u32)))
1060                 return -EFAULT;
1061
1062         if (!capable(CAP_SYS_ADMIN))
1063                 return -EPERM;
1064
1065         /* check for invalid bits set */
1066         if ((flags & ~EXT4_IOC_CHECKPOINT_FLAG_VALID) ||
1067                                 ((flags & JBD2_JOURNAL_FLUSH_DISCARD) &&
1068                                 (flags & JBD2_JOURNAL_FLUSH_ZEROOUT)))
1069                 return -EINVAL;
1070
1071         if (!EXT4_SB(sb)->s_journal)
1072                 return -ENODEV;
1073
1074         if ((flags & JBD2_JOURNAL_FLUSH_DISCARD) &&
1075             !bdev_max_discard_sectors(EXT4_SB(sb)->s_journal->j_dev))
1076                 return -EOPNOTSUPP;
1077
1078         if (flags & EXT4_IOC_CHECKPOINT_FLAG_DRY_RUN)
1079                 return 0;
1080
1081         if (flags & EXT4_IOC_CHECKPOINT_FLAG_DISCARD)
1082                 flush_flags |= JBD2_JOURNAL_FLUSH_DISCARD;
1083
1084         if (flags & EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT) {
1085                 flush_flags |= JBD2_JOURNAL_FLUSH_ZEROOUT;
1086                 pr_info_ratelimited("warning: checkpointing journal with EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT can be slow");
1087         }
1088
1089         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
1090         err = jbd2_journal_flush(EXT4_SB(sb)->s_journal, flush_flags);
1091         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
1092
1093         return err;
1094 }
1095
1096 static int ext4_ioctl_setlabel(struct file *filp, const char __user *user_label)
1097 {
1098         size_t len;
1099         int ret = 0;
1100         char new_label[EXT4_LABEL_MAX + 1];
1101         struct super_block *sb = file_inode(filp)->i_sb;
1102
1103         if (!capable(CAP_SYS_ADMIN))
1104                 return -EPERM;
1105
1106         /*
1107          * Copy the maximum length allowed for ext4 label with one more to
1108          * find the required terminating null byte in order to test the
1109          * label length. The on disk label doesn't need to be null terminated.
1110          */
1111         if (copy_from_user(new_label, user_label, EXT4_LABEL_MAX + 1))
1112                 return -EFAULT;
1113
1114         len = strnlen(new_label, EXT4_LABEL_MAX + 1);
1115         if (len > EXT4_LABEL_MAX)
1116                 return -EINVAL;
1117
1118         /*
1119          * Clear the buffer after the new label
1120          */
1121         memset(new_label + len, 0, EXT4_LABEL_MAX - len);
1122
1123         ret = mnt_want_write_file(filp);
1124         if (ret)
1125                 return ret;
1126
1127         ret = ext4_update_superblocks_fn(sb, ext4_sb_setlabel, new_label);
1128
1129         mnt_drop_write_file(filp);
1130         return ret;
1131 }
1132
1133 static int ext4_ioctl_getlabel(struct ext4_sb_info *sbi, char __user *user_label)
1134 {
1135         char label[EXT4_LABEL_MAX + 1];
1136
1137         /*
1138          * EXT4_LABEL_MAX must always be smaller than FSLABEL_MAX because
1139          * FSLABEL_MAX must include terminating null byte, while s_volume_name
1140          * does not have to.
1141          */
1142         BUILD_BUG_ON(EXT4_LABEL_MAX >= FSLABEL_MAX);
1143
1144         memset(label, 0, sizeof(label));
1145         lock_buffer(sbi->s_sbh);
1146         strncpy(label, sbi->s_es->s_volume_name, EXT4_LABEL_MAX);
1147         unlock_buffer(sbi->s_sbh);
1148
1149         if (copy_to_user(user_label, label, sizeof(label)))
1150                 return -EFAULT;
1151         return 0;
1152 }
1153
1154 static int ext4_ioctl_getuuid(struct ext4_sb_info *sbi,
1155                         struct fsuuid __user *ufsuuid)
1156 {
1157         struct fsuuid fsuuid;
1158         __u8 uuid[UUID_SIZE];
1159
1160         if (copy_from_user(&fsuuid, ufsuuid, sizeof(fsuuid)))
1161                 return -EFAULT;
1162
1163         if (fsuuid.fsu_len == 0) {
1164                 fsuuid.fsu_len = UUID_SIZE;
1165                 if (copy_to_user(&ufsuuid->fsu_len, &fsuuid.fsu_len,
1166                                         sizeof(fsuuid.fsu_len)))
1167                         return -EFAULT;
1168                 return 0;
1169         }
1170
1171         if (fsuuid.fsu_len < UUID_SIZE || fsuuid.fsu_flags != 0)
1172                 return -EINVAL;
1173
1174         lock_buffer(sbi->s_sbh);
1175         memcpy(uuid, sbi->s_es->s_uuid, UUID_SIZE);
1176         unlock_buffer(sbi->s_sbh);
1177
1178         fsuuid.fsu_len = UUID_SIZE;
1179         if (copy_to_user(ufsuuid, &fsuuid, sizeof(fsuuid)) ||
1180             copy_to_user(&ufsuuid->fsu_uuid[0], uuid, UUID_SIZE))
1181                 return -EFAULT;
1182         return 0;
1183 }
1184
1185 static int ext4_ioctl_setuuid(struct file *filp,
1186                         const struct fsuuid __user *ufsuuid)
1187 {
1188         int ret = 0;
1189         struct super_block *sb = file_inode(filp)->i_sb;
1190         struct fsuuid fsuuid;
1191         __u8 uuid[UUID_SIZE];
1192
1193         if (!capable(CAP_SYS_ADMIN))
1194                 return -EPERM;
1195
1196         /*
1197          * If any checksums (group descriptors or metadata) are being used
1198          * then the checksum seed feature is required to change the UUID.
1199          */
1200         if (((ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb))
1201                         && !ext4_has_feature_csum_seed(sb))
1202                 || ext4_has_feature_stable_inodes(sb))
1203                 return -EOPNOTSUPP;
1204
1205         if (copy_from_user(&fsuuid, ufsuuid, sizeof(fsuuid)))
1206                 return -EFAULT;
1207
1208         if (fsuuid.fsu_len != UUID_SIZE || fsuuid.fsu_flags != 0)
1209                 return -EINVAL;
1210
1211         if (copy_from_user(uuid, &ufsuuid->fsu_uuid[0], UUID_SIZE))
1212                 return -EFAULT;
1213
1214         ret = mnt_want_write_file(filp);
1215         if (ret)
1216                 return ret;
1217
1218         ret = ext4_update_superblocks_fn(sb, ext4_sb_setuuid, &uuid);
1219         mnt_drop_write_file(filp);
1220
1221         return ret;
1222 }
1223
1224 static long __ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1225 {
1226         struct inode *inode = file_inode(filp);
1227         struct super_block *sb = inode->i_sb;
1228         struct mnt_idmap *idmap = file_mnt_idmap(filp);
1229
1230         ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
1231
1232         switch (cmd) {
1233         case FS_IOC_GETFSMAP:
1234                 return ext4_ioc_getfsmap(sb, (void __user *)arg);
1235         case EXT4_IOC_GETVERSION:
1236         case EXT4_IOC_GETVERSION_OLD:
1237                 return put_user(inode->i_generation, (int __user *) arg);
1238         case EXT4_IOC_SETVERSION:
1239         case EXT4_IOC_SETVERSION_OLD: {
1240                 handle_t *handle;
1241                 struct ext4_iloc iloc;
1242                 __u32 generation;
1243                 int err;
1244
1245                 if (!inode_owner_or_capable(idmap, inode))
1246                         return -EPERM;
1247
1248                 if (ext4_has_metadata_csum(inode->i_sb)) {
1249                         ext4_warning(sb, "Setting inode version is not "
1250                                      "supported with metadata_csum enabled.");
1251                         return -ENOTTY;
1252                 }
1253
1254                 err = mnt_want_write_file(filp);
1255                 if (err)
1256                         return err;
1257                 if (get_user(generation, (int __user *) arg)) {
1258                         err = -EFAULT;
1259                         goto setversion_out;
1260                 }
1261
1262                 inode_lock(inode);
1263                 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
1264                 if (IS_ERR(handle)) {
1265                         err = PTR_ERR(handle);
1266                         goto unlock_out;
1267                 }
1268                 err = ext4_reserve_inode_write(handle, inode, &iloc);
1269                 if (err == 0) {
1270                         inode_set_ctime_current(inode);
1271                         inode_inc_iversion(inode);
1272                         inode->i_generation = generation;
1273                         err = ext4_mark_iloc_dirty(handle, inode, &iloc);
1274                 }
1275                 ext4_journal_stop(handle);
1276
1277 unlock_out:
1278                 inode_unlock(inode);
1279 setversion_out:
1280                 mnt_drop_write_file(filp);
1281                 return err;
1282         }
1283         case EXT4_IOC_GROUP_EXTEND: {
1284                 ext4_fsblk_t n_blocks_count;
1285                 int err, err2=0;
1286
1287                 err = ext4_resize_begin(sb);
1288                 if (err)
1289                         return err;
1290
1291                 if (get_user(n_blocks_count, (__u32 __user *)arg)) {
1292                         err = -EFAULT;
1293                         goto group_extend_out;
1294                 }
1295
1296                 if (ext4_has_feature_bigalloc(sb)) {
1297                         ext4_msg(sb, KERN_ERR,
1298                                  "Online resizing not supported with bigalloc");
1299                         err = -EOPNOTSUPP;
1300                         goto group_extend_out;
1301                 }
1302
1303                 err = mnt_want_write_file(filp);
1304                 if (err)
1305                         goto group_extend_out;
1306
1307                 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
1308                 if (EXT4_SB(sb)->s_journal) {
1309                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
1310                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal, 0);
1311                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
1312                 }
1313                 if (err == 0)
1314                         err = err2;
1315                 mnt_drop_write_file(filp);
1316 group_extend_out:
1317                 err2 = ext4_resize_end(sb, false);
1318                 if (err == 0)
1319                         err = err2;
1320                 return err;
1321         }
1322
1323         case EXT4_IOC_MOVE_EXT: {
1324                 struct move_extent me;
1325                 struct fd donor;
1326                 int err;
1327
1328                 if (!(filp->f_mode & FMODE_READ) ||
1329                     !(filp->f_mode & FMODE_WRITE))
1330                         return -EBADF;
1331
1332                 if (copy_from_user(&me,
1333                         (struct move_extent __user *)arg, sizeof(me)))
1334                         return -EFAULT;
1335                 me.moved_len = 0;
1336
1337                 donor = fdget(me.donor_fd);
1338                 if (!donor.file)
1339                         return -EBADF;
1340
1341                 if (!(donor.file->f_mode & FMODE_WRITE)) {
1342                         err = -EBADF;
1343                         goto mext_out;
1344                 }
1345
1346                 if (ext4_has_feature_bigalloc(sb)) {
1347                         ext4_msg(sb, KERN_ERR,
1348                                  "Online defrag not supported with bigalloc");
1349                         err = -EOPNOTSUPP;
1350                         goto mext_out;
1351                 } else if (IS_DAX(inode)) {
1352                         ext4_msg(sb, KERN_ERR,
1353                                  "Online defrag not supported with DAX");
1354                         err = -EOPNOTSUPP;
1355                         goto mext_out;
1356                 }
1357
1358                 err = mnt_want_write_file(filp);
1359                 if (err)
1360                         goto mext_out;
1361
1362                 err = ext4_move_extents(filp, donor.file, me.orig_start,
1363                                         me.donor_start, me.len, &me.moved_len);
1364                 mnt_drop_write_file(filp);
1365
1366                 if (copy_to_user((struct move_extent __user *)arg,
1367                                  &me, sizeof(me)))
1368                         err = -EFAULT;
1369 mext_out:
1370                 fdput(donor);
1371                 return err;
1372         }
1373
1374         case EXT4_IOC_GROUP_ADD: {
1375                 struct ext4_new_group_data input;
1376
1377                 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
1378                                 sizeof(input)))
1379                         return -EFAULT;
1380
1381                 return ext4_ioctl_group_add(filp, &input);
1382         }
1383
1384         case EXT4_IOC_MIGRATE:
1385         {
1386                 int err;
1387                 if (!inode_owner_or_capable(idmap, inode))
1388                         return -EACCES;
1389
1390                 err = mnt_want_write_file(filp);
1391                 if (err)
1392                         return err;
1393                 /*
1394                  * inode_mutex prevent write and truncate on the file.
1395                  * Read still goes through. We take i_data_sem in
1396                  * ext4_ext_swap_inode_data before we switch the
1397                  * inode format to prevent read.
1398                  */
1399                 inode_lock((inode));
1400                 err = ext4_ext_migrate(inode);
1401                 inode_unlock((inode));
1402                 mnt_drop_write_file(filp);
1403                 return err;
1404         }
1405
1406         case EXT4_IOC_ALLOC_DA_BLKS:
1407         {
1408                 int err;
1409                 if (!inode_owner_or_capable(idmap, inode))
1410                         return -EACCES;
1411
1412                 err = mnt_want_write_file(filp);
1413                 if (err)
1414                         return err;
1415                 err = ext4_alloc_da_blocks(inode);
1416                 mnt_drop_write_file(filp);
1417                 return err;
1418         }
1419
1420         case EXT4_IOC_SWAP_BOOT:
1421         {
1422                 int err;
1423                 if (!(filp->f_mode & FMODE_WRITE))
1424                         return -EBADF;
1425                 err = mnt_want_write_file(filp);
1426                 if (err)
1427                         return err;
1428                 err = swap_inode_boot_loader(sb, idmap, inode);
1429                 mnt_drop_write_file(filp);
1430                 return err;
1431         }
1432
1433         case EXT4_IOC_RESIZE_FS: {
1434                 ext4_fsblk_t n_blocks_count;
1435                 int err = 0, err2 = 0;
1436                 ext4_group_t o_group = EXT4_SB(sb)->s_groups_count;
1437
1438                 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg,
1439                                    sizeof(__u64))) {
1440                         return -EFAULT;
1441                 }
1442
1443                 err = ext4_resize_begin(sb);
1444                 if (err)
1445                         return err;
1446
1447                 err = mnt_want_write_file(filp);
1448                 if (err)
1449                         goto resizefs_out;
1450
1451                 err = ext4_resize_fs(sb, n_blocks_count);
1452                 if (EXT4_SB(sb)->s_journal) {
1453                         ext4_fc_mark_ineligible(sb, EXT4_FC_REASON_RESIZE, NULL);
1454                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
1455                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal, 0);
1456                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
1457                 }
1458                 if (err == 0)
1459                         err = err2;
1460                 mnt_drop_write_file(filp);
1461                 if (!err && (o_group < EXT4_SB(sb)->s_groups_count) &&
1462                     ext4_has_group_desc_csum(sb) &&
1463                     test_opt(sb, INIT_INODE_TABLE))
1464                         err = ext4_register_li_request(sb, o_group);
1465
1466 resizefs_out:
1467                 err2 = ext4_resize_end(sb, true);
1468                 if (err == 0)
1469                         err = err2;
1470                 return err;
1471         }
1472
1473         case FITRIM:
1474         {
1475                 struct fstrim_range range;
1476                 int ret = 0;
1477
1478                 if (!capable(CAP_SYS_ADMIN))
1479                         return -EPERM;
1480
1481                 if (!bdev_max_discard_sectors(sb->s_bdev))
1482                         return -EOPNOTSUPP;
1483
1484                 /*
1485                  * We haven't replayed the journal, so we cannot use our
1486                  * block-bitmap-guided storage zapping commands.
1487                  */
1488                 if (test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb))
1489                         return -EROFS;
1490
1491                 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
1492                     sizeof(range)))
1493                         return -EFAULT;
1494
1495                 ret = ext4_trim_fs(sb, &range);
1496                 if (ret < 0)
1497                         return ret;
1498
1499                 if (copy_to_user((struct fstrim_range __user *)arg, &range,
1500                     sizeof(range)))
1501                         return -EFAULT;
1502
1503                 return 0;
1504         }
1505         case EXT4_IOC_PRECACHE_EXTENTS:
1506                 return ext4_ext_precache(inode);
1507
1508         case FS_IOC_SET_ENCRYPTION_POLICY:
1509                 if (!ext4_has_feature_encrypt(sb))
1510                         return -EOPNOTSUPP;
1511                 return fscrypt_ioctl_set_policy(filp, (const void __user *)arg);
1512
1513         case FS_IOC_GET_ENCRYPTION_PWSALT:
1514                 return ext4_ioctl_get_encryption_pwsalt(filp, (void __user *)arg);
1515
1516         case FS_IOC_GET_ENCRYPTION_POLICY:
1517                 if (!ext4_has_feature_encrypt(sb))
1518                         return -EOPNOTSUPP;
1519                 return fscrypt_ioctl_get_policy(filp, (void __user *)arg);
1520
1521         case FS_IOC_GET_ENCRYPTION_POLICY_EX:
1522                 if (!ext4_has_feature_encrypt(sb))
1523                         return -EOPNOTSUPP;
1524                 return fscrypt_ioctl_get_policy_ex(filp, (void __user *)arg);
1525
1526         case FS_IOC_ADD_ENCRYPTION_KEY:
1527                 if (!ext4_has_feature_encrypt(sb))
1528                         return -EOPNOTSUPP;
1529                 return fscrypt_ioctl_add_key(filp, (void __user *)arg);
1530
1531         case FS_IOC_REMOVE_ENCRYPTION_KEY:
1532                 if (!ext4_has_feature_encrypt(sb))
1533                         return -EOPNOTSUPP;
1534                 return fscrypt_ioctl_remove_key(filp, (void __user *)arg);
1535
1536         case FS_IOC_REMOVE_ENCRYPTION_KEY_ALL_USERS:
1537                 if (!ext4_has_feature_encrypt(sb))
1538                         return -EOPNOTSUPP;
1539                 return fscrypt_ioctl_remove_key_all_users(filp,
1540                                                           (void __user *)arg);
1541         case FS_IOC_GET_ENCRYPTION_KEY_STATUS:
1542                 if (!ext4_has_feature_encrypt(sb))
1543                         return -EOPNOTSUPP;
1544                 return fscrypt_ioctl_get_key_status(filp, (void __user *)arg);
1545
1546         case FS_IOC_GET_ENCRYPTION_NONCE:
1547                 if (!ext4_has_feature_encrypt(sb))
1548                         return -EOPNOTSUPP;
1549                 return fscrypt_ioctl_get_nonce(filp, (void __user *)arg);
1550
1551         case EXT4_IOC_CLEAR_ES_CACHE:
1552         {
1553                 if (!inode_owner_or_capable(idmap, inode))
1554                         return -EACCES;
1555                 ext4_clear_inode_es(inode);
1556                 return 0;
1557         }
1558
1559         case EXT4_IOC_GETSTATE:
1560         {
1561                 __u32   state = 0;
1562
1563                 if (ext4_test_inode_state(inode, EXT4_STATE_EXT_PRECACHED))
1564                         state |= EXT4_STATE_FLAG_EXT_PRECACHED;
1565                 if (ext4_test_inode_state(inode, EXT4_STATE_NEW))
1566                         state |= EXT4_STATE_FLAG_NEW;
1567                 if (ext4_test_inode_state(inode, EXT4_STATE_NEWENTRY))
1568                         state |= EXT4_STATE_FLAG_NEWENTRY;
1569                 if (ext4_test_inode_state(inode, EXT4_STATE_DA_ALLOC_CLOSE))
1570                         state |= EXT4_STATE_FLAG_DA_ALLOC_CLOSE;
1571
1572                 return put_user(state, (__u32 __user *) arg);
1573         }
1574
1575         case EXT4_IOC_GET_ES_CACHE:
1576                 return ext4_ioctl_get_es_cache(filp, arg);
1577
1578         case EXT4_IOC_SHUTDOWN:
1579                 return ext4_ioctl_shutdown(sb, arg);
1580
1581         case FS_IOC_ENABLE_VERITY:
1582                 if (!ext4_has_feature_verity(sb))
1583                         return -EOPNOTSUPP;
1584                 return fsverity_ioctl_enable(filp, (const void __user *)arg);
1585
1586         case FS_IOC_MEASURE_VERITY:
1587                 if (!ext4_has_feature_verity(sb))
1588                         return -EOPNOTSUPP;
1589                 return fsverity_ioctl_measure(filp, (void __user *)arg);
1590
1591         case FS_IOC_READ_VERITY_METADATA:
1592                 if (!ext4_has_feature_verity(sb))
1593                         return -EOPNOTSUPP;
1594                 return fsverity_ioctl_read_metadata(filp,
1595                                                     (const void __user *)arg);
1596
1597         case EXT4_IOC_CHECKPOINT:
1598                 return ext4_ioctl_checkpoint(filp, arg);
1599
1600         case FS_IOC_GETFSLABEL:
1601                 return ext4_ioctl_getlabel(EXT4_SB(sb), (void __user *)arg);
1602
1603         case FS_IOC_SETFSLABEL:
1604                 return ext4_ioctl_setlabel(filp,
1605                                            (const void __user *)arg);
1606
1607         case EXT4_IOC_GETFSUUID:
1608                 return ext4_ioctl_getuuid(EXT4_SB(sb), (void __user *)arg);
1609         case EXT4_IOC_SETFSUUID:
1610                 return ext4_ioctl_setuuid(filp, (const void __user *)arg);
1611         default:
1612                 return -ENOTTY;
1613         }
1614 }
1615
1616 long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1617 {
1618         return __ext4_ioctl(filp, cmd, arg);
1619 }
1620
1621 #ifdef CONFIG_COMPAT
1622 long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1623 {
1624         /* These are just misnamed, they actually get/put from/to user an int */
1625         switch (cmd) {
1626         case EXT4_IOC32_GETVERSION:
1627                 cmd = EXT4_IOC_GETVERSION;
1628                 break;
1629         case EXT4_IOC32_SETVERSION:
1630                 cmd = EXT4_IOC_SETVERSION;
1631                 break;
1632         case EXT4_IOC32_GROUP_EXTEND:
1633                 cmd = EXT4_IOC_GROUP_EXTEND;
1634                 break;
1635         case EXT4_IOC32_GETVERSION_OLD:
1636                 cmd = EXT4_IOC_GETVERSION_OLD;
1637                 break;
1638         case EXT4_IOC32_SETVERSION_OLD:
1639                 cmd = EXT4_IOC_SETVERSION_OLD;
1640                 break;
1641         case EXT4_IOC32_GETRSVSZ:
1642                 cmd = EXT4_IOC_GETRSVSZ;
1643                 break;
1644         case EXT4_IOC32_SETRSVSZ:
1645                 cmd = EXT4_IOC_SETRSVSZ;
1646                 break;
1647         case EXT4_IOC32_GROUP_ADD: {
1648                 struct compat_ext4_new_group_input __user *uinput;
1649                 struct ext4_new_group_data input;
1650                 int err;
1651
1652                 uinput = compat_ptr(arg);
1653                 err = get_user(input.group, &uinput->group);
1654                 err |= get_user(input.block_bitmap, &uinput->block_bitmap);
1655                 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap);
1656                 err |= get_user(input.inode_table, &uinput->inode_table);
1657                 err |= get_user(input.blocks_count, &uinput->blocks_count);
1658                 err |= get_user(input.reserved_blocks,
1659                                 &uinput->reserved_blocks);
1660                 if (err)
1661                         return -EFAULT;
1662                 return ext4_ioctl_group_add(file, &input);
1663         }
1664         case EXT4_IOC_MOVE_EXT:
1665         case EXT4_IOC_RESIZE_FS:
1666         case FITRIM:
1667         case EXT4_IOC_PRECACHE_EXTENTS:
1668         case FS_IOC_SET_ENCRYPTION_POLICY:
1669         case FS_IOC_GET_ENCRYPTION_PWSALT:
1670         case FS_IOC_GET_ENCRYPTION_POLICY:
1671         case FS_IOC_GET_ENCRYPTION_POLICY_EX:
1672         case FS_IOC_ADD_ENCRYPTION_KEY:
1673         case FS_IOC_REMOVE_ENCRYPTION_KEY:
1674         case FS_IOC_REMOVE_ENCRYPTION_KEY_ALL_USERS:
1675         case FS_IOC_GET_ENCRYPTION_KEY_STATUS:
1676         case FS_IOC_GET_ENCRYPTION_NONCE:
1677         case EXT4_IOC_SHUTDOWN:
1678         case FS_IOC_GETFSMAP:
1679         case FS_IOC_ENABLE_VERITY:
1680         case FS_IOC_MEASURE_VERITY:
1681         case FS_IOC_READ_VERITY_METADATA:
1682         case EXT4_IOC_CLEAR_ES_CACHE:
1683         case EXT4_IOC_GETSTATE:
1684         case EXT4_IOC_GET_ES_CACHE:
1685         case EXT4_IOC_CHECKPOINT:
1686         case FS_IOC_GETFSLABEL:
1687         case FS_IOC_SETFSLABEL:
1688         case EXT4_IOC_GETFSUUID:
1689         case EXT4_IOC_SETFSUUID:
1690                 break;
1691         default:
1692                 return -ENOIOCTLCMD;
1693         }
1694         return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
1695 }
1696 #endif
1697
1698 static void set_overhead(struct ext4_super_block *es, const void *arg)
1699 {
1700         es->s_overhead_clusters = cpu_to_le32(*((unsigned long *) arg));
1701 }
1702
1703 int ext4_update_overhead(struct super_block *sb, bool force)
1704 {
1705         struct ext4_sb_info *sbi = EXT4_SB(sb);
1706
1707         if (sb_rdonly(sb))
1708                 return 0;
1709         if (!force &&
1710             (sbi->s_overhead == 0 ||
1711              sbi->s_overhead == le32_to_cpu(sbi->s_es->s_overhead_clusters)))
1712                 return 0;
1713         return ext4_update_superblocks_fn(sb, set_overhead, &sbi->s_overhead);
1714 }