fs/ext3/super.c

   1 /*
   2  *  linux/fs/ext3/super.c
   3  *
   4  * Copyright (C) 1992, 1993, 1994, 1995
   5  * Remy Card (card@masi.ibp.fr)
   6  * Laboratoire MASI - Institut Blaise Pascal
   7  * Universite Pierre et Marie Curie (Paris VI)
   8  *
   9  *  from
  10  *
  11  *  linux/fs/minix/inode.c
  12  *
  13  *  Copyright (C) 1991, 1992  Linus Torvalds
  14  *
  15  *  Big-endian to little-endian byte-swapping/bitmaps by
  16  *        David S. Miller (davem@caip.rutgers.edu), 1995
  17  */
  18
  19 #include <linux/module.h>
  20 #include <linux/blkdev.h>
  21 #include <linux/parser.h>
  22 #include <linux/exportfs.h>
  23 #include <linux/statfs.h>
  24 #include <linux/random.h>
  25 #include <linux/mount.h>
  26 #include <linux/quotaops.h>
  27 #include <linux/seq_file.h>
  28 #include <linux/log2.h>
  29 #include <linux/cleancache.h>
  30
  31 #include <asm/uaccess.h>
  32
  33 #define CREATE_TRACE_POINTS
  34
  35 #include "ext3.h"
  36 #include "xattr.h"
  37 #include "acl.h"
  38 #include "namei.h"
  39
  40 #ifdef CONFIG_EXT3_DEFAULTS_TO_ORDERED
  41   #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_ORDERED_DATA
  42 #else
  43   #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_WRITEBACK_DATA
  44 #endif
  45
  46 static int ext3_load_journal(struct super_block *, struct ext3_super_block *,
  47                              unsigned long journal_devnum);
  48 static int ext3_create_journal(struct super_block *, struct ext3_super_block *,
  49                                unsigned int);
  50 static int ext3_commit_super(struct super_block *sb,
  51                                struct ext3_super_block *es,
  52                                int sync);
  53 static void ext3_mark_recovery_complete(struct super_block * sb,
  54                                         struct ext3_super_block * es);
  55 static void ext3_clear_journal_err(struct super_block * sb,
  56                                    struct ext3_super_block * es);
  57 static int ext3_sync_fs(struct super_block *sb, int wait);
  58 static const char *ext3_decode_error(struct super_block * sb, int errno,
  59                                      char nbuf[16]);
  60 static int ext3_remount (struct super_block * sb, int * flags, char * data);
  61 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf);
  62 static int ext3_unfreeze(struct super_block *sb);
  63 static int ext3_freeze(struct super_block *sb);
  64
  65 /*
  66  * Wrappers for journal_start/end.
  67  */
  68 handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks)
  69 {
  70         journal_t *journal;
  71
  72         if (sb->s_flags & MS_RDONLY)
  73                 return ERR_PTR(-EROFS);
  74
  75         /* Special case here: if the journal has aborted behind our
  76          * backs (eg. EIO in the commit thread), then we still need to
  77          * take the FS itself readonly cleanly. */
  78         journal = EXT3_SB(sb)->s_journal;
  79         if (is_journal_aborted(journal)) {
  80                 ext3_abort(sb, __func__,
  81                            "Detected aborted journal");
  82                 return ERR_PTR(-EROFS);
  83         }
  84
  85         return journal_start(journal, nblocks);
  86 }
  87
  88 int __ext3_journal_stop(const char *where, handle_t *handle)
  89 {
  90         struct super_block *sb;
  91         int err;
  92         int rc;
  93
  94         sb = handle->h_transaction->t_journal->j_private;
  95         err = handle->h_err;
  96         rc = journal_stop(handle);
  97
  98         if (!err)
  99                 err = rc;
 100         if (err)
 101                 __ext3_std_error(sb, where, err);
 102         return err;
 103 }
 104
 105 void ext3_journal_abort_handle(const char *caller, const char *err_fn,
 106                 struct buffer_head *bh, handle_t *handle, int err)
 107 {
 108         char nbuf[16];
 109         const char *errstr = ext3_decode_error(NULL, err, nbuf);
 110
 111         if (bh)
 112                 BUFFER_TRACE(bh, "abort");
 113
 114         if (!handle->h_err)
 115                 handle->h_err = err;
 116
 117         if (is_handle_aborted(handle))
 118                 return;
 119
 120         printk(KERN_ERR "EXT3-fs: %s: aborting transaction: %s in %s\n",
 121                 caller, errstr, err_fn);
 122
 123         journal_abort_handle(handle);
 124 }
 125
 126 void ext3_msg(struct super_block *sb, const char *prefix,
 127                 const char *fmt, ...)
 128 {
 129         struct va_format vaf;
 130         va_list args;
 131
 132         va_start(args, fmt);
 133
 134         vaf.fmt = fmt;
 135         vaf.va = &args;
 136
 137         printk("%sEXT3-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
 138
 139         va_end(args);
 140 }
 141
 142 /* Deal with the reporting of failure conditions on a filesystem such as
 143  * inconsistencies detected or read IO failures.
 144  *
 145  * On ext2, we can store the error state of the filesystem in the
 146  * superblock.  That is not possible on ext3, because we may have other
 147  * write ordering constraints on the superblock which prevent us from
 148  * writing it out straight away; and given that the journal is about to
 149  * be aborted, we can't rely on the current, or future, transactions to
 150  * write out the superblock safely.
 151  *
 152  * We'll just use the journal_abort() error code to record an error in
 153  * the journal instead.  On recovery, the journal will complain about
 154  * that error until we've noted it down and cleared it.
 155  */
 156
 157 static void ext3_handle_error(struct super_block *sb)
 158 {
 159         struct ext3_super_block *es = EXT3_SB(sb)->s_es;
 160
 161         EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
 162         es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
 163
 164         if (sb->s_flags & MS_RDONLY)
 165                 return;
 166
 167         if (!test_opt (sb, ERRORS_CONT)) {
 168                 journal_t *journal = EXT3_SB(sb)->s_journal;
 169
 170                 set_opt(EXT3_SB(sb)->s_mount_opt, ABORT);
 171                 if (journal)
 172                         journal_abort(journal, -EIO);
 173         }
 174         if (test_opt (sb, ERRORS_RO)) {
 175                 ext3_msg(sb, KERN_CRIT,
 176                         "error: remounting filesystem read-only");
 177                 sb->s_flags |= MS_RDONLY;
 178         }
 179         ext3_commit_super(sb, es, 1);
 180         if (test_opt(sb, ERRORS_PANIC))
 181                 panic("EXT3-fs (%s): panic forced after error\n",
 182                         sb->s_id);
 183 }
 184
 185 void ext3_error(struct super_block *sb, const char *function,
 186                 const char *fmt, ...)
 187 {
 188         struct va_format vaf;
 189         va_list args;
 190
 191         va_start(args, fmt);
 192
 193         vaf.fmt = fmt;
 194         vaf.va = &args;
 195
 196         printk(KERN_CRIT "EXT3-fs error (device %s): %s: %pV\n",
 197                sb->s_id, function, &vaf);
 198
 199         va_end(args);
 200
 201         ext3_handle_error(sb);
 202 }
 203
 204 static const char *ext3_decode_error(struct super_block * sb, int errno,
 205                                      char nbuf[16])
 206 {
 207         char *errstr = NULL;
 208
 209         switch (errno) {
 210         case -EIO:
 211                 errstr = "IO failure";
 212                 break;
 213         case -ENOMEM:
 214                 errstr = "Out of memory";
 215                 break;
 216         case -EROFS:
 217                 if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT)
 218                         errstr = "Journal has aborted";
 219                 else
 220                         errstr = "Readonly filesystem";
 221                 break;
 222         default:
 223                 /* If the caller passed in an extra buffer for unknown
 224                  * errors, textualise them now.  Else we just return
 225                  * NULL. */
 226                 if (nbuf) {
 227                         /* Check for truncated error codes... */
 228                         if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
 229                                 errstr = nbuf;
 230                 }
 231                 break;
 232         }
 233
 234         return errstr;
 235 }
 236
 237 /* __ext3_std_error decodes expected errors from journaling functions
 238  * automatically and invokes the appropriate error response.  */
 239
 240 void __ext3_std_error (struct super_block * sb, const char * function,
 241                        int errno)
 242 {
 243         char nbuf[16];
 244         const char *errstr;
 245
 246         /* Special case: if the error is EROFS, and we're not already
 247          * inside a transaction, then there's really no point in logging
 248          * an error. */
 249         if (errno == -EROFS && journal_current_handle() == NULL &&
 250             (sb->s_flags & MS_RDONLY))
 251                 return;
 252
 253         errstr = ext3_decode_error(sb, errno, nbuf);
 254         ext3_msg(sb, KERN_CRIT, "error in %s: %s", function, errstr);
 255
 256         ext3_handle_error(sb);
 257 }
 258
 259 /*
 260  * ext3_abort is a much stronger failure handler than ext3_error.  The
 261  * abort function may be used to deal with unrecoverable failures such
 262  * as journal IO errors or ENOMEM at a critical moment in log management.
 263  *
 264  * We unconditionally force the filesystem into an ABORT|READONLY state,
 265  * unless the error response on the fs has been set to panic in which
 266  * case we take the easy way out and panic immediately.
 267  */
 268
 269 void ext3_abort(struct super_block *sb, const char *function,
 270                  const char *fmt, ...)
 271 {
 272         struct va_format vaf;
 273         va_list args;
 274
 275         va_start(args, fmt);
 276
 277         vaf.fmt = fmt;
 278         vaf.va = &args;
 279
 280         printk(KERN_CRIT "EXT3-fs (%s): error: %s: %pV\n",
 281                sb->s_id, function, &vaf);
 282
 283         va_end(args);
 284
 285         if (test_opt(sb, ERRORS_PANIC))
 286                 panic("EXT3-fs: panic from previous error\n");
 287
 288         if (sb->s_flags & MS_RDONLY)
 289                 return;
 290
 291         ext3_msg(sb, KERN_CRIT,
 292                 "error: remounting filesystem read-only");
 293         EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
 294         sb->s_flags |= MS_RDONLY;
 295         set_opt(EXT3_SB(sb)->s_mount_opt, ABORT);
 296         if (EXT3_SB(sb)->s_journal)
 297                 journal_abort(EXT3_SB(sb)->s_journal, -EIO);
 298 }
 299
 300 void ext3_warning(struct super_block *sb, const char *function,
 301                   const char *fmt, ...)
 302 {
 303         struct va_format vaf;
 304         va_list args;
 305
 306         va_start(args, fmt);
 307
 308         vaf.fmt = fmt;
 309         vaf.va = &args;
 310
 311         printk(KERN_WARNING "EXT3-fs (%s): warning: %s: %pV\n",
 312                sb->s_id, function, &vaf);
 313
 314         va_end(args);
 315 }
 316
 317 void ext3_update_dynamic_rev(struct super_block *sb)
 318 {
 319         struct ext3_super_block *es = EXT3_SB(sb)->s_es;
 320
 321         if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
 322                 return;
 323
 324         ext3_msg(sb, KERN_WARNING,
 325                 "warning: updating to rev %d because of "
 326                 "new feature flag, running e2fsck is recommended",
 327                 EXT3_DYNAMIC_REV);
 328
 329         es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO);
 330         es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE);
 331         es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV);
 332         /* leave es->s_feature_*compat flags alone */
 333         /* es->s_uuid will be set by e2fsck if empty */
 334
 335         /*
 336          * The rest of the superblock fields should be zero, and if not it
 337          * means they are likely already in use, so leave them alone.  We
 338          * can leave it up to e2fsck to clean up any inconsistencies there.
 339          */
 340 }
 341
 342 /*
 343  * Open the external journal device
 344  */
 345 static struct block_device *ext3_blkdev_get(dev_t dev, struct super_block *sb)
 346 {
 347         struct block_device *bdev;
 348         char b[BDEVNAME_SIZE];
 349
 350         bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
 351         if (IS_ERR(bdev))
 352                 goto fail;
 353         return bdev;
 354
 355 fail:
 356         ext3_msg(sb, "error: failed to open journal device %s: %ld",
 357                 __bdevname(dev, b), PTR_ERR(bdev));
 358
 359         return NULL;
 360 }
 361
 362 /*
 363  * Release the journal device
 364  */
 365 static int ext3_blkdev_put(struct block_device *bdev)
 366 {
 367         return blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
 368 }
 369
 370 static int ext3_blkdev_remove(struct ext3_sb_info *sbi)
 371 {
 372         struct block_device *bdev;
 373         int ret = -ENODEV;
 374
 375         bdev = sbi->journal_bdev;
 376         if (bdev) {
 377                 ret = ext3_blkdev_put(bdev);
 378                 sbi->journal_bdev = NULL;
 379         }
 380         return ret;
 381 }
 382
 383 static inline struct inode *orphan_list_entry(struct list_head *l)
 384 {
 385         return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
 386 }
 387
 388 static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
 389 {
 390         struct list_head *l;
 391
 392         ext3_msg(sb, KERN_ERR, "error: sb orphan head is %d",
 393                le32_to_cpu(sbi->s_es->s_last_orphan));
 394
 395         ext3_msg(sb, KERN_ERR, "sb_info orphan list:");
 396         list_for_each(l, &sbi->s_orphan) {
 397                 struct inode *inode = orphan_list_entry(l);
 398                 ext3_msg(sb, KERN_ERR, "  "
 399                        "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
 400                        inode->i_sb->s_id, inode->i_ino, inode,
 401                        inode->i_mode, inode->i_nlink,
 402                        NEXT_ORPHAN(inode));
 403         }
 404 }
 405
 406 static void ext3_put_super (struct super_block * sb)
 407 {
 408         struct ext3_sb_info *sbi = EXT3_SB(sb);
 409         struct ext3_super_block *es = sbi->s_es;
 410         int i, err;
 411
 412         dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
 413         ext3_xattr_put_super(sb);
 414         err = journal_destroy(sbi->s_journal);
 415         sbi->s_journal = NULL;
 416         if (err < 0)
 417                 ext3_abort(sb, __func__, "Couldn't clean up the journal");
 418
 419         if (!(sb->s_flags & MS_RDONLY)) {
 420                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
 421                 es->s_state = cpu_to_le16(sbi->s_mount_state);
 422                 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
 423                 mark_buffer_dirty(sbi->s_sbh);
 424                 ext3_commit_super(sb, es, 1);
 425         }
 426
 427         for (i = 0; i < sbi->s_gdb_count; i++)
 428                 brelse(sbi->s_group_desc[i]);
 429         kfree(sbi->s_group_desc);
 430         percpu_counter_destroy(&sbi->s_freeblocks_counter);
 431         percpu_counter_destroy(&sbi->s_freeinodes_counter);
 432         percpu_counter_destroy(&sbi->s_dirs_counter);
 433         brelse(sbi->s_sbh);
 434 #ifdef CONFIG_QUOTA
 435         for (i = 0; i < MAXQUOTAS; i++)
 436                 kfree(sbi->s_qf_names[i]);
 437 #endif
 438
 439         /* Debugging code just in case the in-memory inode orphan list
 440          * isn't empty.  The on-disk one can be non-empty if we've
 441          * detected an error and taken the fs readonly, but the
 442          * in-memory list had better be clean by this point. */
 443         if (!list_empty(&sbi->s_orphan))
 444                 dump_orphan_list(sb, sbi);
 445         J_ASSERT(list_empty(&sbi->s_orphan));
 446
 447         invalidate_bdev(sb->s_bdev);
 448         if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
 449                 /*
 450                  * Invalidate the journal device's buffers.  We don't want them
 451                  * floating about in memory - the physical journal device may
 452                  * hotswapped, and it breaks the `ro-after' testing code.
 453                  */
 454                 sync_blockdev(sbi->journal_bdev);
 455                 invalidate_bdev(sbi->journal_bdev);
 456                 ext3_blkdev_remove(sbi);
 457         }
 458         sb->s_fs_info = NULL;
 459         kfree(sbi->s_blockgroup_lock);
 460         kfree(sbi);
 461 }
 462
 463 static struct kmem_cache *ext3_inode_cachep;
 464
 465 /*
 466  * Called inside transaction, so use GFP_NOFS
 467  */
 468 static struct inode *ext3_alloc_inode(struct super_block *sb)
 469 {
 470         struct ext3_inode_info *ei;
 471
 472         ei = kmem_cache_alloc(ext3_inode_cachep, GFP_NOFS);
 473         if (!ei)
 474                 return NULL;
 475         ei->i_block_alloc_info = NULL;
 476         ei->vfs_inode.i_version = 1;
 477         atomic_set(&ei->i_datasync_tid, 0);
 478         atomic_set(&ei->i_sync_tid, 0);
 479         return &ei->vfs_inode;
 480 }
 481
 482 static int ext3_drop_inode(struct inode *inode)
 483 {
 484         int drop = generic_drop_inode(inode);
 485
 486         trace_ext3_drop_inode(inode, drop);
 487         return drop;
 488 }
 489
 490 static void ext3_i_callback(struct rcu_head *head)
 491 {
 492         struct inode *inode = container_of(head, struct inode, i_rcu);
 493         kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
 494 }
 495
 496 static void ext3_destroy_inode(struct inode *inode)
 497 {
 498         if (!list_empty(&(EXT3_I(inode)->i_orphan))) {
 499                 printk("EXT3 Inode %p: orphan list check failed!\n",
 500                         EXT3_I(inode));
 501                 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
 502                                 EXT3_I(inode), sizeof(struct ext3_inode_info),
 503                                 false);
 504                 dump_stack();
 505         }
 506         call_rcu(&inode->i_rcu, ext3_i_callback);
 507 }
 508
 509 static void init_once(void *foo)
 510 {
 511         struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
 512
 513         INIT_LIST_HEAD(&ei->i_orphan);
 514 #ifdef CONFIG_EXT3_FS_XATTR
 515         init_rwsem(&ei->xattr_sem);
 516 #endif
 517         mutex_init(&ei->truncate_mutex);
 518         inode_init_once(&ei->vfs_inode);
 519 }
 520
 521 static int init_inodecache(void)
 522 {
 523         ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
 524                                              sizeof(struct ext3_inode_info),
 525                                              0, (SLAB_RECLAIM_ACCOUNT|
 526                                                 SLAB_MEM_SPREAD),
 527                                              init_once);
 528         if (ext3_inode_cachep == NULL)
 529                 return -ENOMEM;
 530         return 0;
 531 }
 532
 533 static void destroy_inodecache(void)
 534 {
 535         /*
 536          * Make sure all delayed rcu free inodes are flushed before we
 537          * destroy cache.
 538          */
 539         rcu_barrier();
 540         kmem_cache_destroy(ext3_inode_cachep);
 541 }
 542
 543 static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
 544 {
 545 #if defined(CONFIG_QUOTA)
 546         struct ext3_sb_info *sbi = EXT3_SB(sb);
 547
 548         if (sbi->s_jquota_fmt) {
 549                 char *fmtname = "";
 550
 551                 switch (sbi->s_jquota_fmt) {
 552                 case QFMT_VFS_OLD:
 553                         fmtname = "vfsold";
 554                         break;
 555                 case QFMT_VFS_V0:
 556                         fmtname = "vfsv0";
 557                         break;
 558                 case QFMT_VFS_V1:
 559                         fmtname = "vfsv1";
 560                         break;
 561                 }
 562                 seq_printf(seq, ",jqfmt=%s", fmtname);
 563         }
 564
 565         if (sbi->s_qf_names[USRQUOTA])
 566                 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
 567
 568         if (sbi->s_qf_names[GRPQUOTA])
 569                 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
 570
 571         if (test_opt(sb, USRQUOTA))
 572                 seq_puts(seq, ",usrquota");
 573
 574         if (test_opt(sb, GRPQUOTA))
 575                 seq_puts(seq, ",grpquota");
 576 #endif
 577 }
 578
 579 static char *data_mode_string(unsigned long mode)
 580 {
 581         switch (mode) {
 582         case EXT3_MOUNT_JOURNAL_DATA:
 583                 return "journal";
 584         case EXT3_MOUNT_ORDERED_DATA:
 585                 return "ordered";
 586         case EXT3_MOUNT_WRITEBACK_DATA:
 587                 return "writeback";
 588         }
 589         return "unknown";
 590 }
 591
 592 /*
 593  * Show an option if
 594  *  - it's set to a non-default value OR
 595  *  - if the per-sb default is different from the global default
 596  */
 597 static int ext3_show_options(struct seq_file *seq, struct dentry *root)
 598 {
 599         struct super_block *sb = root->d_sb;
 600         struct ext3_sb_info *sbi = EXT3_SB(sb);
 601         struct ext3_super_block *es = sbi->s_es;
 602         unsigned long def_mount_opts;
 603
 604         def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
 605
 606         if (sbi->s_sb_block != 1)
 607                 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
 608         if (test_opt(sb, MINIX_DF))
 609                 seq_puts(seq, ",minixdf");
 610         if (test_opt(sb, GRPID))
 611                 seq_puts(seq, ",grpid");
 612         if (!test_opt(sb, GRPID) && (def_mount_opts & EXT3_DEFM_BSDGROUPS))
 613                 seq_puts(seq, ",nogrpid");
 614         if (!uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT3_DEF_RESUID)) ||
 615             le16_to_cpu(es->s_def_resuid) != EXT3_DEF_RESUID) {
 616                 seq_printf(seq, ",resuid=%u",
 617                                 from_kuid_munged(&init_user_ns, sbi->s_resuid));
 618         }
 619         if (!gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT3_DEF_RESGID)) ||
 620             le16_to_cpu(es->s_def_resgid) != EXT3_DEF_RESGID) {
 621                 seq_printf(seq, ",resgid=%u",
 622                                 from_kgid_munged(&init_user_ns, sbi->s_resgid));
 623         }
 624         if (test_opt(sb, ERRORS_RO)) {
 625                 int def_errors = le16_to_cpu(es->s_errors);
 626
 627                 if (def_errors == EXT3_ERRORS_PANIC ||
 628                     def_errors == EXT3_ERRORS_CONTINUE) {
 629                         seq_puts(seq, ",errors=remount-ro");
 630                 }
 631         }
 632         if (test_opt(sb, ERRORS_CONT))
 633                 seq_puts(seq, ",errors=continue");
 634         if (test_opt(sb, ERRORS_PANIC))
 635                 seq_puts(seq, ",errors=panic");
 636         if (test_opt(sb, NO_UID32))
 637                 seq_puts(seq, ",nouid32");
 638         if (test_opt(sb, DEBUG))
 639                 seq_puts(seq, ",debug");
 640 #ifdef CONFIG_EXT3_FS_XATTR
 641         if (test_opt(sb, XATTR_USER))
 642                 seq_puts(seq, ",user_xattr");
 643         if (!test_opt(sb, XATTR_USER) &&
 644             (def_mount_opts & EXT3_DEFM_XATTR_USER)) {
 645                 seq_puts(seq, ",nouser_xattr");
 646         }
 647 #endif
 648 #ifdef CONFIG_EXT3_FS_POSIX_ACL
 649         if (test_opt(sb, POSIX_ACL))
 650                 seq_puts(seq, ",acl");
 651         if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT3_DEFM_ACL))
 652                 seq_puts(seq, ",noacl");
 653 #endif
 654         if (!test_opt(sb, RESERVATION))
 655                 seq_puts(seq, ",noreservation");
 656         if (sbi->s_commit_interval) {
 657                 seq_printf(seq, ",commit=%u",
 658                            (unsigned) (sbi->s_commit_interval / HZ));
 659         }
 660
 661         /*
 662          * Always display barrier state so it's clear what the status is.
 663          */
 664         seq_puts(seq, ",barrier=");
 665         seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
 666         seq_printf(seq, ",data=%s", data_mode_string(test_opt(sb, DATA_FLAGS)));
 667         if (test_opt(sb, DATA_ERR_ABORT))
 668                 seq_puts(seq, ",data_err=abort");
 669
 670         if (test_opt(sb, NOLOAD))
 671                 seq_puts(seq, ",norecovery");
 672
 673         ext3_show_quota_options(seq, sb);
 674
 675         return 0;
 676 }
 677
 678
 679 static struct inode *ext3_nfs_get_inode(struct super_block *sb,
 680                 u64 ino, u32 generation)
 681 {
 682         struct inode *inode;
 683
 684         if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO)
 685                 return ERR_PTR(-ESTALE);
 686         if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count))
 687                 return ERR_PTR(-ESTALE);
 688
 689         /* iget isn't really right if the inode is currently unallocated!!
 690          *
 691          * ext3_read_inode will return a bad_inode if the inode had been
 692          * deleted, so we should be safe.
 693          *
 694          * Currently we don't know the generation for parent directory, so
 695          * a generation of 0 means "accept any"
 696          */
 697         inode = ext3_iget(sb, ino);
 698         if (IS_ERR(inode))
 699                 return ERR_CAST(inode);
 700         if (generation && inode->i_generation != generation) {
 701                 iput(inode);
 702                 return ERR_PTR(-ESTALE);
 703         }
 704
 705         return inode;
 706 }
 707
 708 static struct dentry *ext3_fh_to_dentry(struct super_block *sb, struct fid *fid,
 709                 int fh_len, int fh_type)
 710 {
 711         return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
 712                                     ext3_nfs_get_inode);
 713 }
 714
 715 static struct dentry *ext3_fh_to_parent(struct super_block *sb, struct fid *fid,
 716                 int fh_len, int fh_type)
 717 {
 718         return generic_fh_to_parent(sb, fid, fh_len, fh_type,
 719                                     ext3_nfs_get_inode);
 720 }
 721
 722 /*
 723  * Try to release metadata pages (indirect blocks, directories) which are
 724  * mapped via the block device.  Since these pages could have journal heads
 725  * which would prevent try_to_free_buffers() from freeing them, we must use
 726  * jbd layer's try_to_free_buffers() function to release them.
 727  */
 728 static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
 729                                  gfp_t wait)
 730 {
 731         journal_t *journal = EXT3_SB(sb)->s_journal;
 732
 733         WARN_ON(PageChecked(page));
 734         if (!page_has_buffers(page))
 735                 return 0;
 736         if (journal)
 737                 return journal_try_to_free_buffers(journal, page,
 738                                                    wait & ~__GFP_WAIT);
 739         return try_to_free_buffers(page);
 740 }
 741
 742 #ifdef CONFIG_QUOTA
 743 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
 744 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
 745
 746 static int ext3_write_dquot(struct dquot *dquot);
 747 static int ext3_acquire_dquot(struct dquot *dquot);
 748 static int ext3_release_dquot(struct dquot *dquot);
 749 static int ext3_mark_dquot_dirty(struct dquot *dquot);
 750 static int ext3_write_info(struct super_block *sb, int type);
 751 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
 752                          struct path *path);
 753 static int ext3_quota_on_mount(struct super_block *sb, int type);
 754 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
 755                                size_t len, loff_t off);
 756 static ssize_t ext3_quota_write(struct super_block *sb, int type,
 757                                 const char *data, size_t len, loff_t off);
 758
 759 static const struct dquot_operations ext3_quota_operations = {
 760         .write_dquot    = ext3_write_dquot,
 761         .acquire_dquot  = ext3_acquire_dquot,
 762         .release_dquot  = ext3_release_dquot,
 763         .mark_dirty     = ext3_mark_dquot_dirty,
 764         .write_info     = ext3_write_info,
 765         .alloc_dquot    = dquot_alloc,
 766         .destroy_dquot  = dquot_destroy,
 767 };
 768
 769 static const struct quotactl_ops ext3_qctl_operations = {
 770         .quota_on       = ext3_quota_on,
 771         .quota_off      = dquot_quota_off,
 772         .quota_sync     = dquot_quota_sync,
 773         .get_info       = dquot_get_dqinfo,
 774         .set_info       = dquot_set_dqinfo,
 775         .get_dqblk      = dquot_get_dqblk,
 776         .set_dqblk      = dquot_set_dqblk
 777 };
 778 #endif
 779
 780 static const struct super_operations ext3_sops = {
 781         .alloc_inode    = ext3_alloc_inode,
 782         .destroy_inode  = ext3_destroy_inode,
 783         .write_inode    = ext3_write_inode,
 784         .dirty_inode    = ext3_dirty_inode,
 785         .drop_inode     = ext3_drop_inode,
 786         .evict_inode    = ext3_evict_inode,
 787         .put_super      = ext3_put_super,
 788         .sync_fs        = ext3_sync_fs,
 789         .freeze_fs      = ext3_freeze,
 790         .unfreeze_fs    = ext3_unfreeze,
 791         .statfs         = ext3_statfs,
 792         .remount_fs     = ext3_remount,
 793         .show_options   = ext3_show_options,
 794 #ifdef CONFIG_QUOTA
 795         .quota_read     = ext3_quota_read,
 796         .quota_write    = ext3_quota_write,
 797 #endif
 798         .bdev_try_to_free_page = bdev_try_to_free_page,
 799 };
 800
 801 static const struct export_operations ext3_export_ops = {
 802         .fh_to_dentry = ext3_fh_to_dentry,
 803         .fh_to_parent = ext3_fh_to_parent,
 804         .get_parent = ext3_get_parent,
 805 };
 806
 807 enum {
 808         Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
 809         Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
 810         Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
 811         Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
 812         Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
 813         Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
 814         Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
 815         Opt_data_err_abort, Opt_data_err_ignore,
 816         Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
 817         Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
 818         Opt_noquota, Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err,
 819         Opt_resize, Opt_usrquota, Opt_grpquota
 820 };
 821
 822 static const match_table_t tokens = {
 823         {Opt_bsd_df, "bsddf"},
 824         {Opt_minix_df, "minixdf"},
 825         {Opt_grpid, "grpid"},
 826         {Opt_grpid, "bsdgroups"},
 827         {Opt_nogrpid, "nogrpid"},
 828         {Opt_nogrpid, "sysvgroups"},
 829         {Opt_resgid, "resgid=%u"},
 830         {Opt_resuid, "resuid=%u"},
 831         {Opt_sb, "sb=%u"},
 832         {Opt_err_cont, "errors=continue"},
 833         {Opt_err_panic, "errors=panic"},
 834         {Opt_err_ro, "errors=remount-ro"},
 835         {Opt_nouid32, "nouid32"},
 836         {Opt_nocheck, "nocheck"},
 837         {Opt_nocheck, "check=none"},
 838         {Opt_debug, "debug"},
 839         {Opt_oldalloc, "oldalloc"},
 840         {Opt_orlov, "orlov"},
 841         {Opt_user_xattr, "user_xattr"},
 842         {Opt_nouser_xattr, "nouser_xattr"},
 843         {Opt_acl, "acl"},
 844         {Opt_noacl, "noacl"},
 845         {Opt_reservation, "reservation"},
 846         {Opt_noreservation, "noreservation"},
 847         {Opt_noload, "noload"},
 848         {Opt_noload, "norecovery"},
 849         {Opt_nobh, "nobh"},
 850         {Opt_bh, "bh"},
 851         {Opt_commit, "commit=%u"},
 852         {Opt_journal_update, "journal=update"},
 853         {Opt_journal_inum, "journal=%u"},
 854         {Opt_journal_dev, "journal_dev=%u"},
 855         {Opt_abort, "abort"},
 856         {Opt_data_journal, "data=journal"},
 857         {Opt_data_ordered, "data=ordered"},
 858         {Opt_data_writeback, "data=writeback"},
 859         {Opt_data_err_abort, "data_err=abort"},
 860         {Opt_data_err_ignore, "data_err=ignore"},
 861         {Opt_offusrjquota, "usrjquota="},
 862         {Opt_usrjquota, "usrjquota=%s"},
 863         {Opt_offgrpjquota, "grpjquota="},
 864         {Opt_grpjquota, "grpjquota=%s"},
 865         {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
 866         {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
 867         {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
 868         {Opt_grpquota, "grpquota"},
 869         {Opt_noquota, "noquota"},
 870         {Opt_quota, "quota"},
 871         {Opt_usrquota, "usrquota"},
 872         {Opt_barrier, "barrier=%u"},
 873         {Opt_barrier, "barrier"},
 874         {Opt_nobarrier, "nobarrier"},
 875         {Opt_resize, "resize"},
 876         {Opt_err, NULL},
 877 };
 878
 879 static ext3_fsblk_t get_sb_block(void **data, struct super_block *sb)
 880 {
 881         ext3_fsblk_t    sb_block;
 882         char            *options = (char *) *data;
 883
 884         if (!options || strncmp(options, "sb=", 3) != 0)
 885                 return 1;       /* Default location */
 886         options += 3;
 887         /*todo: use simple_strtoll with >32bit ext3 */
 888         sb_block = simple_strtoul(options, &options, 0);
 889         if (*options && *options != ',') {
 890                 ext3_msg(sb, "error: invalid sb specification: %s",
 891                        (char *) *data);
 892                 return 1;
 893         }
 894         if (*options == ',')
 895                 options++;
 896         *data = (void *) options;
 897         return sb_block;
 898 }
 899
 900 #ifdef CONFIG_QUOTA
 901 static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
 902 {
 903         struct ext3_sb_info *sbi = EXT3_SB(sb);
 904         char *qname;
 905
 906         if (sb_any_quota_loaded(sb) &&
 907                 !sbi->s_qf_names[qtype]) {
 908                 ext3_msg(sb, KERN_ERR,
 909                         "Cannot change journaled "
 910                         "quota options when quota turned on");
 911                 return 0;
 912         }
 913         qname = match_strdup(args);
 914         if (!qname) {
 915                 ext3_msg(sb, KERN_ERR,
 916                         "Not enough memory for storing quotafile name");
 917                 return 0;
 918         }
 919         if (sbi->s_qf_names[qtype]) {
 920                 int same = !strcmp(sbi->s_qf_names[qtype], qname);
 921
 922                 kfree(qname);
 923                 if (!same) {
 924                         ext3_msg(sb, KERN_ERR,
 925                                  "%s quota file already specified",
 926                                  QTYPE2NAME(qtype));
 927                 }
 928                 return same;
 929         }
 930         if (strchr(qname, '/')) {
 931                 ext3_msg(sb, KERN_ERR,
 932                         "quotafile must be on filesystem root");
 933                 kfree(qname);
 934                 return 0;
 935         }
 936         sbi->s_qf_names[qtype] = qname;
 937         set_opt(sbi->s_mount_opt, QUOTA);
 938         return 1;
 939 }
 940
 941 static int clear_qf_name(struct super_block *sb, int qtype) {
 942
 943         struct ext3_sb_info *sbi = EXT3_SB(sb);
 944
 945         if (sb_any_quota_loaded(sb) &&
 946                 sbi->s_qf_names[qtype]) {
 947                 ext3_msg(sb, KERN_ERR, "Cannot change journaled quota options"
 948                         " when quota turned on");
 949                 return 0;
 950         }
 951         if (sbi->s_qf_names[qtype]) {
 952                 kfree(sbi->s_qf_names[qtype]);
 953                 sbi->s_qf_names[qtype] = NULL;
 954         }
 955         return 1;
 956 }
 957 #endif
 958
 959 static int parse_options (char *options, struct super_block *sb,
 960                           unsigned int *inum, unsigned long *journal_devnum,
 961                           ext3_fsblk_t *n_blocks_count, int is_remount)
 962 {
 963         struct ext3_sb_info *sbi = EXT3_SB(sb);
 964         char * p;
 965         substring_t args[MAX_OPT_ARGS];
 966         int data_opt = 0;
 967         int option;
 968         kuid_t uid;
 969         kgid_t gid;
 970 #ifdef CONFIG_QUOTA
 971         int qfmt;
 972 #endif
 973
 974         if (!options)
 975                 return 1;
 976
 977         while ((p = strsep (&options, ",")) != NULL) {
 978                 int token;
 979                 if (!*p)
 980                         continue;
 981                 /*
 982                  * Initialize args struct so we know whether arg was
 983                  * found; some options take optional arguments.
 984                  */
 985                 args[0].to = args[0].from = NULL;
 986                 token = match_token(p, tokens, args);
 987                 switch (token) {
 988                 case Opt_bsd_df:
 989                         clear_opt (sbi->s_mount_opt, MINIX_DF);
 990                         break;
 991                 case Opt_minix_df:
 992                         set_opt (sbi->s_mount_opt, MINIX_DF);
 993                         break;
 994                 case Opt_grpid:
 995                         set_opt (sbi->s_mount_opt, GRPID);
 996                         break;
 997                 case Opt_nogrpid:
 998                         clear_opt (sbi->s_mount_opt, GRPID);
 999                         break;
1000                 case Opt_resuid:
1001                         if (match_int(&args[0], &option))
1002                                 return 0;
1003                         uid = make_kuid(current_user_ns(), option);
1004                         if (!uid_valid(uid)) {
1005                                 ext3_msg(sb, KERN_ERR, "Invalid uid value %d", option);
1006                                 return 0;
1007
1008                         }
1009                         sbi->s_resuid = uid;
1010                         break;
1011                 case Opt_resgid:
1012                         if (match_int(&args[0], &option))
1013                                 return 0;
1014                         gid = make_kgid(current_user_ns(), option);
1015                         if (!gid_valid(gid)) {
1016                                 ext3_msg(sb, KERN_ERR, "Invalid gid value %d", option);
1017                                 return 0;
1018                         }
1019                         sbi->s_resgid = gid;
1020                         break;
1021                 case Opt_sb:
1022                         /* handled by get_sb_block() instead of here */
1023                         /* *sb_block = match_int(&args[0]); */
1024                         break;
1025                 case Opt_err_panic:
1026                         clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1027                         clear_opt (sbi->s_mount_opt, ERRORS_RO);
1028                         set_opt (sbi->s_mount_opt, ERRORS_PANIC);
1029                         break;
1030                 case Opt_err_ro:
1031                         clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1032                         clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1033                         set_opt (sbi->s_mount_opt, ERRORS_RO);
1034                         break;
1035                 case Opt_err_cont:
1036                         clear_opt (sbi->s_mount_opt, ERRORS_RO);
1037                         clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1038                         set_opt (sbi->s_mount_opt, ERRORS_CONT);
1039                         break;
1040                 case Opt_nouid32:
1041                         set_opt (sbi->s_mount_opt, NO_UID32);
1042                         break;
1043                 case Opt_nocheck:
1044                         clear_opt (sbi->s_mount_opt, CHECK);
1045                         break;
1046                 case Opt_debug:
1047                         set_opt (sbi->s_mount_opt, DEBUG);
1048                         break;
1049                 case Opt_oldalloc:
1050                         ext3_msg(sb, KERN_WARNING,
1051                                 "Ignoring deprecated oldalloc option");
1052                         break;
1053                 case Opt_orlov:
1054                         ext3_msg(sb, KERN_WARNING,
1055                                 "Ignoring deprecated orlov option");
1056                         break;
1057 #ifdef CONFIG_EXT3_FS_XATTR
1058                 case Opt_user_xattr:
1059                         set_opt (sbi->s_mount_opt, XATTR_USER);
1060                         break;
1061                 case Opt_nouser_xattr:
1062                         clear_opt (sbi->s_mount_opt, XATTR_USER);
1063                         break;
1064 #else
1065                 case Opt_user_xattr:
1066                 case Opt_nouser_xattr:
1067                         ext3_msg(sb, KERN_INFO,
1068                                 "(no)user_xattr options not supported");
1069                         break;
1070 #endif
1071 #ifdef CONFIG_EXT3_FS_POSIX_ACL
1072                 case Opt_acl:
1073                         set_opt(sbi->s_mount_opt, POSIX_ACL);
1074                         break;
1075                 case Opt_noacl:
1076                         clear_opt(sbi->s_mount_opt, POSIX_ACL);
1077                         break;
1078 #else
1079                 case Opt_acl:
1080                 case Opt_noacl:
1081                         ext3_msg(sb, KERN_INFO,
1082                                 "(no)acl options not supported");
1083                         break;
1084 #endif
1085                 case Opt_reservation:
1086                         set_opt(sbi->s_mount_opt, RESERVATION);
1087                         break;
1088                 case Opt_noreservation:
1089                         clear_opt(sbi->s_mount_opt, RESERVATION);
1090                         break;
1091                 case Opt_journal_update:
1092                         /* @@@ FIXME */
1093                         /* Eventually we will want to be able to create
1094                            a journal file here.  For now, only allow the
1095                            user to specify an existing inode to be the
1096                            journal file. */
1097                         if (is_remount) {
1098                                 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1099                                         "journal on remount");
1100                                 return 0;
1101                         }
1102                         set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
1103                         break;
1104                 case Opt_journal_inum:
1105                         if (is_remount) {
1106                                 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1107                                        "journal on remount");
1108                                 return 0;
1109                         }
1110                         if (match_int(&args[0], &option))
1111                                 return 0;
1112                         *inum = option;
1113                         break;
1114                 case Opt_journal_dev:
1115                         if (is_remount) {
1116                                 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1117                                        "journal on remount");
1118                                 return 0;
1119                         }
1120                         if (match_int(&args[0], &option))
1121                                 return 0;
1122                         *journal_devnum = option;
1123                         break;
1124                 case Opt_noload:
1125                         set_opt (sbi->s_mount_opt, NOLOAD);
1126                         break;
1127                 case Opt_commit:
1128                         if (match_int(&args[0], &option))
1129                                 return 0;
1130                         if (option < 0)
1131                                 return 0;
1132                         if (option == 0)
1133                                 option = JBD_DEFAULT_MAX_COMMIT_AGE;
1134                         sbi->s_commit_interval = HZ * option;
1135                         break;
1136                 case Opt_data_journal:
1137                         data_opt = EXT3_MOUNT_JOURNAL_DATA;
1138                         goto datacheck;
1139                 case Opt_data_ordered:
1140                         data_opt = EXT3_MOUNT_ORDERED_DATA;
1141                         goto datacheck;
1142                 case Opt_data_writeback:
1143                         data_opt = EXT3_MOUNT_WRITEBACK_DATA;
1144                 datacheck:
1145                         if (is_remount) {
1146                                 if (test_opt(sb, DATA_FLAGS) == data_opt)
1147                                         break;
1148                                 ext3_msg(sb, KERN_ERR,
1149                                         "error: cannot change "
1150                                         "data mode on remount. The filesystem "
1151                                         "is mounted in data=%s mode and you "
1152                                         "try to remount it in data=%s mode.",
1153                                         data_mode_string(test_opt(sb,
1154                                                         DATA_FLAGS)),
1155                                         data_mode_string(data_opt));
1156                                 return 0;
1157                         } else {
1158                                 clear_opt(sbi->s_mount_opt, DATA_FLAGS);
1159                                 sbi->s_mount_opt |= data_opt;
1160                         }
1161                         break;
1162                 case Opt_data_err_abort:
1163                         set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1164                         break;
1165                 case Opt_data_err_ignore:
1166                         clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1167                         break;
1168 #ifdef CONFIG_QUOTA
1169                 case Opt_usrjquota:
1170                         if (!set_qf_name(sb, USRQUOTA, &args[0]))
1171                                 return 0;
1172                         break;
1173                 case Opt_grpjquota:
1174                         if (!set_qf_name(sb, GRPQUOTA, &args[0]))
1175                                 return 0;
1176                         break;
1177                 case Opt_offusrjquota:
1178                         if (!clear_qf_name(sb, USRQUOTA))
1179                                 return 0;
1180                         break;
1181                 case Opt_offgrpjquota:
1182                         if (!clear_qf_name(sb, GRPQUOTA))
1183                                 return 0;
1184                         break;
1185                 case Opt_jqfmt_vfsold:
1186                         qfmt = QFMT_VFS_OLD;
1187                         goto set_qf_format;
1188                 case Opt_jqfmt_vfsv0:
1189                         qfmt = QFMT_VFS_V0;
1190                         goto set_qf_format;
1191                 case Opt_jqfmt_vfsv1:
1192                         qfmt = QFMT_VFS_V1;
1193 set_qf_format:
1194                         if (sb_any_quota_loaded(sb) &&
1195                             sbi->s_jquota_fmt != qfmt) {
1196                                 ext3_msg(sb, KERN_ERR, "error: cannot change "
1197                                         "journaled quota options when "
1198                                         "quota turned on.");
1199                                 return 0;
1200                         }
1201                         sbi->s_jquota_fmt = qfmt;
1202                         break;
1203                 case Opt_quota:
1204                 case Opt_usrquota:
1205                         set_opt(sbi->s_mount_opt, QUOTA);
1206                         set_opt(sbi->s_mount_opt, USRQUOTA);
1207                         break;
1208                 case Opt_grpquota:
1209                         set_opt(sbi->s_mount_opt, QUOTA);
1210                         set_opt(sbi->s_mount_opt, GRPQUOTA);
1211                         break;
1212                 case Opt_noquota:
1213                         if (sb_any_quota_loaded(sb)) {
1214                                 ext3_msg(sb, KERN_ERR, "error: cannot change "
1215                                         "quota options when quota turned on.");
1216                                 return 0;
1217                         }
1218                         clear_opt(sbi->s_mount_opt, QUOTA);
1219                         clear_opt(sbi->s_mount_opt, USRQUOTA);
1220                         clear_opt(sbi->s_mount_opt, GRPQUOTA);
1221                         break;
1222 #else
1223                 case Opt_quota:
1224                 case Opt_usrquota:
1225                 case Opt_grpquota:
1226                         ext3_msg(sb, KERN_ERR,
1227                                 "error: quota options not supported.");
1228                         break;
1229                 case Opt_usrjquota:
1230                 case Opt_grpjquota:
1231                 case Opt_offusrjquota:
1232                 case Opt_offgrpjquota:
1233                 case Opt_jqfmt_vfsold:
1234                 case Opt_jqfmt_vfsv0:
1235                 case Opt_jqfmt_vfsv1:
1236                         ext3_msg(sb, KERN_ERR,
1237                                 "error: journaled quota options not "
1238                                 "supported.");
1239                         break;
1240                 case Opt_noquota:
1241                         break;
1242 #endif
1243                 case Opt_abort:
1244                         set_opt(sbi->s_mount_opt, ABORT);
1245                         break;
1246                 case Opt_nobarrier:
1247                         clear_opt(sbi->s_mount_opt, BARRIER);
1248                         break;
1249                 case Opt_barrier:
1250                         if (args[0].from) {
1251                                 if (match_int(&args[0], &option))
1252                                         return 0;
1253                         } else
1254                                 option = 1;     /* No argument, default to 1 */
1255                         if (option)
1256                                 set_opt(sbi->s_mount_opt, BARRIER);
1257                         else
1258                                 clear_opt(sbi->s_mount_opt, BARRIER);
1259                         break;
1260                 case Opt_ignore:
1261                         break;
1262                 case Opt_resize:
1263                         if (!is_remount) {
1264                                 ext3_msg(sb, KERN_ERR,
1265                                         "error: resize option only available "
1266                                         "for remount");
1267                                 return 0;
1268                         }
1269                         if (match_int(&args[0], &option) != 0)
1270                                 return 0;
1271                         *n_blocks_count = option;
1272                         break;
1273                 case Opt_nobh:
1274                         ext3_msg(sb, KERN_WARNING,
1275                                 "warning: ignoring deprecated nobh option");
1276                         break;
1277                 case Opt_bh:
1278                         ext3_msg(sb, KERN_WARNING,
1279                                 "warning: ignoring deprecated bh option");
1280                         break;
1281                 default:
1282                         ext3_msg(sb, KERN_ERR,
1283                                 "error: unrecognized mount option \"%s\" "
1284                                 "or missing value", p);
1285                         return 0;
1286                 }
1287         }
1288 #ifdef CONFIG_QUOTA
1289         if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1290                 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
1291                         clear_opt(sbi->s_mount_opt, USRQUOTA);
1292                 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
1293                         clear_opt(sbi->s_mount_opt, GRPQUOTA);
1294
1295                 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
1296                         ext3_msg(sb, KERN_ERR, "error: old and new quota "
1297                                         "format mixing.");
1298                         return 0;
1299                 }
1300
1301                 if (!sbi->s_jquota_fmt) {
1302                         ext3_msg(sb, KERN_ERR, "error: journaled quota format "
1303                                         "not specified.");
1304                         return 0;
1305                 }
1306         } else {
1307                 if (sbi->s_jquota_fmt) {
1308                         ext3_msg(sb, KERN_ERR, "error: journaled quota format "
1309                                         "specified with no journaling "
1310                                         "enabled.");
1311                         return 0;
1312                 }
1313         }
1314 #endif
1315         return 1;
1316 }
1317
1318 static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1319                             int read_only)
1320 {
1321         struct ext3_sb_info *sbi = EXT3_SB(sb);
1322         int res = 0;
1323
1324         if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
1325                 ext3_msg(sb, KERN_ERR,
1326                         "error: revision level too high, "
1327                         "forcing read-only mode");
1328                 res = MS_RDONLY;
1329         }
1330         if (read_only)
1331                 return res;
1332         if (!(sbi->s_mount_state & EXT3_VALID_FS))
1333                 ext3_msg(sb, KERN_WARNING,
1334                         "warning: mounting unchecked fs, "
1335                         "running e2fsck is recommended");
1336         else if ((sbi->s_mount_state & EXT3_ERROR_FS))
1337                 ext3_msg(sb, KERN_WARNING,
1338                         "warning: mounting fs with errors, "
1339                         "running e2fsck is recommended");
1340         else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
1341                  le16_to_cpu(es->s_mnt_count) >=
1342                         le16_to_cpu(es->s_max_mnt_count))
1343                 ext3_msg(sb, KERN_WARNING,
1344                         "warning: maximal mount count reached, "
1345                         "running e2fsck is recommended");
1346         else if (le32_to_cpu(es->s_checkinterval) &&
1347                 (le32_to_cpu(es->s_lastcheck) +
1348                         le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1349                 ext3_msg(sb, KERN_WARNING,
1350                         "warning: checktime reached, "
1351                         "running e2fsck is recommended");
1352 #if 0
1353                 /* @@@ We _will_ want to clear the valid bit if we find
1354                    inconsistencies, to force a fsck at reboot.  But for
1355                    a plain journaled filesystem we can keep it set as
1356                    valid forever! :) */
1357         es->s_state &= cpu_to_le16(~EXT3_VALID_FS);
1358 #endif
1359         if (!le16_to_cpu(es->s_max_mnt_count))
1360                 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
1361         le16_add_cpu(&es->s_mnt_count, 1);
1362         es->s_mtime = cpu_to_le32(get_seconds());
1363         ext3_update_dynamic_rev(sb);
1364         EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1365
1366         ext3_commit_super(sb, es, 1);
1367         if (test_opt(sb, DEBUG))
1368                 ext3_msg(sb, KERN_INFO, "[bs=%lu, gc=%lu, "
1369                                 "bpg=%lu, ipg=%lu, mo=%04lx]",
1370                         sb->s_blocksize,
1371                         sbi->s_groups_count,
1372                         EXT3_BLOCKS_PER_GROUP(sb),
1373                         EXT3_INODES_PER_GROUP(sb),
1374                         sbi->s_mount_opt);
1375
1376         if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1377                 char b[BDEVNAME_SIZE];
1378                 ext3_msg(sb, KERN_INFO, "using external journal on %s",
1379                         bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1380         } else {
1381                 ext3_msg(sb, KERN_INFO, "using internal journal");
1382         }
1383         cleancache_init_fs(sb);
1384         return res;
1385 }
1386
1387 /* Called at mount-time, super-block is locked */
1388 static int ext3_check_descriptors(struct super_block *sb)
1389 {
1390         struct ext3_sb_info *sbi = EXT3_SB(sb);
1391         int i;
1392
1393         ext3_debug ("Checking group descriptors");
1394
1395         for (i = 0; i < sbi->s_groups_count; i++) {
1396                 struct ext3_group_desc *gdp = ext3_get_group_desc(sb, i, NULL);
1397                 ext3_fsblk_t first_block = ext3_group_first_block_no(sb, i);
1398                 ext3_fsblk_t last_block;
1399
1400                 if (i == sbi->s_groups_count - 1)
1401                         last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
1402                 else
1403                         last_block = first_block +
1404                                 (EXT3_BLOCKS_PER_GROUP(sb) - 1);
1405
1406                 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
1407                     le32_to_cpu(gdp->bg_block_bitmap) > last_block)
1408                 {
1409                         ext3_error (sb, "ext3_check_descriptors",
1410                                     "Block bitmap for group %d"
1411                                     " not in group (block %lu)!",
1412                                     i, (unsigned long)
1413                                         le32_to_cpu(gdp->bg_block_bitmap));
1414                         return 0;
1415                 }
1416                 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
1417                     le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
1418                 {
1419                         ext3_error (sb, "ext3_check_descriptors",
1420                                     "Inode bitmap for group %d"
1421                                     " not in group (block %lu)!",
1422                                     i, (unsigned long)
1423                                         le32_to_cpu(gdp->bg_inode_bitmap));
1424                         return 0;
1425                 }
1426                 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
1427                     le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
1428                     last_block)
1429                 {
1430                         ext3_error (sb, "ext3_check_descriptors",
1431                                     "Inode table for group %d"
1432                                     " not in group (block %lu)!",
1433                                     i, (unsigned long)
1434                                         le32_to_cpu(gdp->bg_inode_table));
1435                         return 0;
1436                 }
1437         }
1438
1439         sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1440         sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1441         return 1;
1442 }
1443
1444
1445 /* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1446  * the superblock) which were deleted from all directories, but held open by
1447  * a process at the time of a crash.  We walk the list and try to delete these
1448  * inodes at recovery time (only with a read-write filesystem).
1449  *
1450  * In order to keep the orphan inode chain consistent during traversal (in
1451  * case of crash during recovery), we link each inode into the superblock
1452  * orphan list_head and handle it the same way as an inode deletion during
1453  * normal operation (which journals the operations for us).
1454  *
1455  * We only do an iget() and an iput() on each inode, which is very safe if we
1456  * accidentally point at an in-use or already deleted inode.  The worst that
1457  * can happen in this case is that we get a "bit already cleared" message from
1458  * ext3_free_inode().  The only reason we would point at a wrong inode is if
1459  * e2fsck was run on this filesystem, and it must have already done the orphan
1460  * inode cleanup for us, so we can safely abort without any further action.
1461  */
1462 static void ext3_orphan_cleanup (struct super_block * sb,
1463                                  struct ext3_super_block * es)
1464 {
1465         unsigned int s_flags = sb->s_flags;
1466         int nr_orphans = 0, nr_truncates = 0;
1467 #ifdef CONFIG_QUOTA
1468         int i;
1469 #endif
1470         if (!es->s_last_orphan) {
1471                 jbd_debug(4, "no orphan inodes to clean up\n");
1472                 return;
1473         }
1474
1475         if (bdev_read_only(sb->s_bdev)) {
1476                 ext3_msg(sb, KERN_ERR, "error: write access "
1477                         "unavailable, skipping orphan cleanup.");
1478                 return;
1479         }
1480
1481         /* Check if feature set allows readwrite operations */
1482         if (EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP)) {
1483                 ext3_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
1484                          "unknown ROCOMPAT features");
1485                 return;
1486         }
1487
1488         if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1489                 /* don't clear list on RO mount w/ errors */
1490                 if (es->s_last_orphan && !(s_flags & MS_RDONLY)) {
1491                         jbd_debug(1, "Errors on filesystem, "
1492                                   "clearing orphan list.\n");
1493                         es->s_last_orphan = 0;
1494                 }
1495                 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1496                 return;
1497         }
1498
1499         if (s_flags & MS_RDONLY) {
1500                 ext3_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
1501                 sb->s_flags &= ~MS_RDONLY;
1502         }
1503 #ifdef CONFIG_QUOTA
1504         /* Needed for iput() to work correctly and not trash data */
1505         sb->s_flags |= MS_ACTIVE;
1506         /* Turn on quotas so that they are updated correctly */
1507         for (i = 0; i < MAXQUOTAS; i++) {
1508                 if (EXT3_SB(sb)->s_qf_names[i]) {
1509                         int ret = ext3_quota_on_mount(sb, i);
1510                         if (ret < 0)
1511                                 ext3_msg(sb, KERN_ERR,
1512                                         "error: cannot turn on journaled "
1513                                         "quota: %d", ret);
1514                 }
1515         }
1516 #endif
1517
1518         while (es->s_last_orphan) {
1519                 struct inode *inode;
1520
1521                 inode = ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1522                 if (IS_ERR(inode)) {
1523                         es->s_last_orphan = 0;
1524                         break;
1525                 }
1526
1527                 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1528                 dquot_initialize(inode);
1529                 if (inode->i_nlink) {
1530                         printk(KERN_DEBUG
1531                                 "%s: truncating inode %lu to %Ld bytes\n",
1532                                 __func__, inode->i_ino, inode->i_size);
1533                         jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1534                                   inode->i_ino, inode->i_size);
1535                         ext3_truncate(inode);
1536                         nr_truncates++;
1537                 } else {
1538                         printk(KERN_DEBUG
1539                                 "%s: deleting unreferenced inode %lu\n",
1540                                 __func__, inode->i_ino);
1541                         jbd_debug(2, "deleting unreferenced inode %lu\n",
1542                                   inode->i_ino);
1543                         nr_orphans++;
1544                 }
1545                 iput(inode);  /* The delete magic happens here! */
1546         }
1547
1548 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1549
1550         if (nr_orphans)
1551                 ext3_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
1552                        PLURAL(nr_orphans));
1553         if (nr_truncates)
1554                 ext3_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
1555                        PLURAL(nr_truncates));
1556 #ifdef CONFIG_QUOTA
1557         /* Turn quotas off */
1558         for (i = 0; i < MAXQUOTAS; i++) {
1559                 if (sb_dqopt(sb)->files[i])
1560                         dquot_quota_off(sb, i);
1561         }
1562 #endif
1563         sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1564 }
1565
1566 /*
1567  * Maximal file size.  There is a direct, and {,double-,triple-}indirect
1568  * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1569  * We need to be 1 filesystem block less than the 2^32 sector limit.
1570  */
1571 static loff_t ext3_max_size(int bits)
1572 {
1573         loff_t res = EXT3_NDIR_BLOCKS;
1574         int meta_blocks;
1575         loff_t upper_limit;
1576
1577         /* This is calculated to be the largest file size for a
1578          * dense, file such that the total number of
1579          * sectors in the file, including data and all indirect blocks,
1580          * does not exceed 2^32 -1
1581          * __u32 i_blocks representing the total number of
1582          * 512 bytes blocks of the file
1583          */
1584         upper_limit = (1LL << 32) - 1;
1585
1586         /* total blocks in file system block size */
1587         upper_limit >>= (bits - 9);
1588
1589
1590         /* indirect blocks */
1591         meta_blocks = 1;
1592         /* double indirect blocks */
1593         meta_blocks += 1 + (1LL << (bits-2));
1594         /* tripple indirect blocks */
1595         meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1596
1597         upper_limit -= meta_blocks;
1598         upper_limit <<= bits;
1599
1600         res += 1LL << (bits-2);
1601         res += 1LL << (2*(bits-2));
1602         res += 1LL << (3*(bits-2));
1603         res <<= bits;
1604         if (res > upper_limit)
1605                 res = upper_limit;
1606
1607         if (res > MAX_LFS_FILESIZE)
1608                 res = MAX_LFS_FILESIZE;
1609
1610         return res;
1611 }
1612
1613 static ext3_fsblk_t descriptor_loc(struct super_block *sb,
1614                                     ext3_fsblk_t logic_sb_block,
1615                                     int nr)
1616 {
1617         struct ext3_sb_info *sbi = EXT3_SB(sb);
1618         unsigned long bg, first_meta_bg;
1619         int has_super = 0;
1620
1621         first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1622
1623         if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1624             nr < first_meta_bg)
1625                 return (logic_sb_block + nr + 1);
1626         bg = sbi->s_desc_per_block * nr;
1627         if (ext3_bg_has_super(sb, bg))
1628                 has_super = 1;
1629         return (has_super + ext3_group_first_block_no(sb, bg));
1630 }
1631
1632
1633 static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1634 {
1635         struct buffer_head * bh;
1636         struct ext3_super_block *es = NULL;
1637         struct ext3_sb_info *sbi;
1638         ext3_fsblk_t block;
1639         ext3_fsblk_t sb_block = get_sb_block(&data, sb);
1640         ext3_fsblk_t logic_sb_block;
1641         unsigned long offset = 0;
1642         unsigned int journal_inum = 0;
1643         unsigned long journal_devnum = 0;
1644         unsigned long def_mount_opts;
1645         struct inode *root;
1646         int blocksize;
1647         int hblock;
1648         int db_count;
1649         int i;
1650         int needs_recovery;
1651         int ret = -EINVAL;
1652         __le32 features;
1653         int err;
1654
1655         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1656         if (!sbi)
1657                 return -ENOMEM;
1658
1659         sbi->s_blockgroup_lock =
1660                 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
1661         if (!sbi->s_blockgroup_lock) {
1662                 kfree(sbi);
1663                 return -ENOMEM;
1664         }
1665         sb->s_fs_info = sbi;
1666         sbi->s_sb_block = sb_block;
1667
1668         blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1669         if (!blocksize) {
1670                 ext3_msg(sb, KERN_ERR, "error: unable to set blocksize");
1671                 goto out_fail;
1672         }
1673
1674         /*
1675          * The ext3 superblock will not be buffer aligned for other than 1kB
1676          * block sizes.  We need to calculate the offset from buffer start.
1677          */
1678         if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1679                 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1680                 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1681         } else {
1682                 logic_sb_block = sb_block;
1683         }
1684
1685         if (!(bh = sb_bread(sb, logic_sb_block))) {
1686                 ext3_msg(sb, KERN_ERR, "error: unable to read superblock");
1687                 goto out_fail;
1688         }
1689         /*
1690          * Note: s_es must be initialized as soon as possible because
1691          *       some ext3 macro-instructions depend on its value
1692          */
1693         es = (struct ext3_super_block *) (bh->b_data + offset);
1694         sbi->s_es = es;
1695         sb->s_magic = le16_to_cpu(es->s_magic);
1696         if (sb->s_magic != EXT3_SUPER_MAGIC)
1697                 goto cantfind_ext3;
1698
1699         /* Set defaults before we parse the mount options */
1700         def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1701         if (def_mount_opts & EXT3_DEFM_DEBUG)
1702                 set_opt(sbi->s_mount_opt, DEBUG);
1703         if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1704                 set_opt(sbi->s_mount_opt, GRPID);
1705         if (def_mount_opts & EXT3_DEFM_UID16)
1706                 set_opt(sbi->s_mount_opt, NO_UID32);
1707 #ifdef CONFIG_EXT3_FS_XATTR
1708         if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1709                 set_opt(sbi->s_mount_opt, XATTR_USER);
1710 #endif
1711 #ifdef CONFIG_EXT3_FS_POSIX_ACL
1712         if (def_mount_opts & EXT3_DEFM_ACL)
1713                 set_opt(sbi->s_mount_opt, POSIX_ACL);
1714 #endif
1715         if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1716                 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1717         else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1718                 set_opt(sbi->s_mount_opt, ORDERED_DATA);
1719         else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1720                 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
1721
1722         if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1723                 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1724         else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_CONTINUE)
1725                 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1726         else
1727                 set_opt(sbi->s_mount_opt, ERRORS_RO);
1728
1729         sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
1730         sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
1731
1732         /* enable barriers by default */
1733         set_opt(sbi->s_mount_opt, BARRIER);
1734         set_opt(sbi->s_mount_opt, RESERVATION);
1735
1736         if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1737                             NULL, 0))
1738                 goto failed_mount;
1739
1740         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1741                 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
1742
1743         if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1744             (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1745              EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1746              EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1747                 ext3_msg(sb, KERN_WARNING,
1748                         "warning: feature flags set on rev 0 fs, "
1749                         "running e2fsck is recommended");
1750         /*
1751          * Check feature flags regardless of the revision level, since we
1752          * previously didn't change the revision level when setting the flags,
1753          * so there is a chance incompat flags are set on a rev 0 filesystem.
1754          */
1755         features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1756         if (features) {
1757                 ext3_msg(sb, KERN_ERR,
1758                         "error: couldn't mount because of unsupported "
1759                         "optional features (%x)", le32_to_cpu(features));
1760                 goto failed_mount;
1761         }
1762         features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1763         if (!(sb->s_flags & MS_RDONLY) && features) {
1764                 ext3_msg(sb, KERN_ERR,
1765                         "error: couldn't mount RDWR because of unsupported "
1766                         "optional features (%x)", le32_to_cpu(features));
1767                 goto failed_mount;
1768         }
1769         blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1770
1771         if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1772             blocksize > EXT3_MAX_BLOCK_SIZE) {
1773                 ext3_msg(sb, KERN_ERR,
1774                         "error: couldn't mount because of unsupported "
1775                         "filesystem blocksize %d", blocksize);
1776                 goto failed_mount;
1777         }
1778
1779         hblock = bdev_logical_block_size(sb->s_bdev);
1780         if (sb->s_blocksize != blocksize) {
1781                 /*
1782                  * Make sure the blocksize for the filesystem is larger
1783                  * than the hardware sectorsize for the machine.
1784                  */
1785                 if (blocksize < hblock) {
1786                         ext3_msg(sb, KERN_ERR,
1787                                 "error: fsblocksize %d too small for "
1788                                 "hardware sectorsize %d", blocksize, hblock);
1789                         goto failed_mount;
1790                 }
1791
1792                 brelse (bh);
1793                 if (!sb_set_blocksize(sb, blocksize)) {
1794                         ext3_msg(sb, KERN_ERR,
1795                                 "error: bad blocksize %d", blocksize);
1796                         goto out_fail;
1797                 }
1798                 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1799                 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1800                 bh = sb_bread(sb, logic_sb_block);
1801                 if (!bh) {
1802                         ext3_msg(sb, KERN_ERR,
1803                                "error: can't read superblock on 2nd try");
1804                         goto failed_mount;
1805                 }
1806                 es = (struct ext3_super_block *)(bh->b_data + offset);
1807                 sbi->s_es = es;
1808                 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
1809                         ext3_msg(sb, KERN_ERR,
1810                                 "error: magic mismatch");
1811                         goto failed_mount;
1812                 }
1813         }
1814
1815         sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1816
1817         if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1818                 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1819                 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1820         } else {
1821                 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1822                 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1823                 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
1824                     (!is_power_of_2(sbi->s_inode_size)) ||
1825                     (sbi->s_inode_size > blocksize)) {
1826                         ext3_msg(sb, KERN_ERR,
1827                                 "error: unsupported inode size: %d",
1828                                 sbi->s_inode_size);
1829                         goto failed_mount;
1830                 }
1831         }
1832         sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1833                                    le32_to_cpu(es->s_log_frag_size);
1834         if (blocksize != sbi->s_frag_size) {
1835                 ext3_msg(sb, KERN_ERR,
1836                        "error: fragsize %lu != blocksize %u (unsupported)",
1837                        sbi->s_frag_size, blocksize);
1838                 goto failed_mount;
1839         }
1840         sbi->s_frags_per_block = 1;
1841         sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1842         sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1843         sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1844         if (EXT3_INODE_SIZE(sb) == 0 || EXT3_INODES_PER_GROUP(sb) == 0)
1845                 goto cantfind_ext3;
1846         sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1847         if (sbi->s_inodes_per_block == 0)
1848                 goto cantfind_ext3;
1849         sbi->s_itb_per_group = sbi->s_inodes_per_group /
1850                                         sbi->s_inodes_per_block;
1851         sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1852         sbi->s_sbh = bh;
1853         sbi->s_mount_state = le16_to_cpu(es->s_state);
1854         sbi->s_addr_per_block_bits = ilog2(EXT3_ADDR_PER_BLOCK(sb));
1855         sbi->s_desc_per_block_bits = ilog2(EXT3_DESC_PER_BLOCK(sb));
1856         for (i=0; i < 4; i++)
1857                 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1858         sbi->s_def_hash_version = es->s_def_hash_version;
1859         i = le32_to_cpu(es->s_flags);
1860         if (i & EXT2_FLAGS_UNSIGNED_HASH)
1861                 sbi->s_hash_unsigned = 3;
1862         else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
1863 #ifdef __CHAR_UNSIGNED__
1864                 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
1865                 sbi->s_hash_unsigned = 3;
1866 #else
1867                 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
1868 #endif
1869         }
1870
1871         if (sbi->s_blocks_per_group > blocksize * 8) {
1872                 ext3_msg(sb, KERN_ERR,
1873                         "#blocks per group too big: %lu",
1874                         sbi->s_blocks_per_group);
1875                 goto failed_mount;
1876         }
1877         if (sbi->s_frags_per_group > blocksize * 8) {
1878                 ext3_msg(sb, KERN_ERR,
1879                         "error: #fragments per group too big: %lu",
1880                         sbi->s_frags_per_group);
1881                 goto failed_mount;
1882         }
1883         if (sbi->s_inodes_per_group > blocksize * 8) {
1884                 ext3_msg(sb, KERN_ERR,
1885                         "error: #inodes per group too big: %lu",
1886                         sbi->s_inodes_per_group);
1887                 goto failed_mount;
1888         }
1889
1890         err = generic_check_addressable(sb->s_blocksize_bits,
1891                                         le32_to_cpu(es->s_blocks_count));
1892         if (err) {
1893                 ext3_msg(sb, KERN_ERR,
1894                         "error: filesystem is too large to mount safely");
1895                 if (sizeof(sector_t) < 8)
1896                         ext3_msg(sb, KERN_ERR,
1897                                 "error: CONFIG_LBDAF not enabled");
1898                 ret = err;
1899                 goto failed_mount;
1900         }
1901
1902         if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1903                 goto cantfind_ext3;
1904         sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1905                                le32_to_cpu(es->s_first_data_block) - 1)
1906                                        / EXT3_BLOCKS_PER_GROUP(sb)) + 1;
1907         db_count = DIV_ROUND_UP(sbi->s_groups_count, EXT3_DESC_PER_BLOCK(sb));
1908         sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1909                                     GFP_KERNEL);
1910         if (sbi->s_group_desc == NULL) {
1911                 ext3_msg(sb, KERN_ERR,
1912                         "error: not enough memory");
1913                 ret = -ENOMEM;
1914                 goto failed_mount;
1915         }
1916
1917         bgl_lock_init(sbi->s_blockgroup_lock);
1918
1919         for (i = 0; i < db_count; i++) {
1920                 block = descriptor_loc(sb, logic_sb_block, i);
1921                 sbi->s_group_desc[i] = sb_bread(sb, block);
1922                 if (!sbi->s_group_desc[i]) {
1923                         ext3_msg(sb, KERN_ERR,
1924                                 "error: can't read group descriptor %d", i);
1925                         db_count = i;
1926                         goto failed_mount2;
1927                 }
1928         }
1929         if (!ext3_check_descriptors (sb)) {
1930                 ext3_msg(sb, KERN_ERR,
1931                         "error: group descriptors corrupted");
1932                 goto failed_mount2;
1933         }
1934         sbi->s_gdb_count = db_count;
1935         get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1936         spin_lock_init(&sbi->s_next_gen_lock);
1937
1938         /* per fileystem reservation list head & lock */
1939         spin_lock_init(&sbi->s_rsv_window_lock);
1940         sbi->s_rsv_window_root = RB_ROOT;
1941         /* Add a single, static dummy reservation to the start of the
1942          * reservation window list --- it gives us a placeholder for
1943          * append-at-start-of-list which makes the allocation logic
1944          * _much_ simpler. */
1945         sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1946         sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1947         sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1948         sbi->s_rsv_window_head.rsv_goal_size = 0;
1949         ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1950
1951         /*
1952          * set up enough so that it can read an inode
1953          */
1954         sb->s_op = &ext3_sops;
1955         sb->s_export_op = &ext3_export_ops;
1956         sb->s_xattr = ext3_xattr_handlers;
1957 #ifdef CONFIG_QUOTA
1958         sb->s_qcop = &ext3_qctl_operations;
1959         sb->dq_op = &ext3_quota_operations;
1960 #endif
1961         memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
1962         INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1963         mutex_init(&sbi->s_orphan_lock);
1964         mutex_init(&sbi->s_resize_lock);
1965
1966         sb->s_root = NULL;
1967
1968         needs_recovery = (es->s_last_orphan != 0 ||
1969                           EXT3_HAS_INCOMPAT_FEATURE(sb,
1970                                     EXT3_FEATURE_INCOMPAT_RECOVER));
1971
1972         /*
1973          * The first inode we look at is the journal inode.  Don't try
1974          * root first: it may be modified in the journal!
1975          */
1976         if (!test_opt(sb, NOLOAD) &&
1977             EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
1978                 if (ext3_load_journal(sb, es, journal_devnum))
1979                         goto failed_mount2;
1980         } else if (journal_inum) {
1981                 if (ext3_create_journal(sb, es, journal_inum))
1982                         goto failed_mount2;
1983         } else {
1984                 if (!silent)
1985                         ext3_msg(sb, KERN_ERR,
1986                                 "error: no journal found. "
1987                                 "mounting ext3 over ext2?");
1988                 goto failed_mount2;
1989         }
1990         err = percpu_counter_init(&sbi->s_freeblocks_counter,
1991                         ext3_count_free_blocks(sb));
1992         if (!err) {
1993                 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1994                                 ext3_count_free_inodes(sb));
1995         }
1996         if (!err) {
1997                 err = percpu_counter_init(&sbi->s_dirs_counter,
1998                                 ext3_count_dirs(sb));
1999         }
2000         if (err) {
2001                 ext3_msg(sb, KERN_ERR, "error: insufficient memory");
2002                 ret = err;
2003                 goto failed_mount3;
2004         }
2005
2006         /* We have now updated the journal if required, so we can
2007          * validate the data journaling mode. */
2008         switch (test_opt(sb, DATA_FLAGS)) {
2009         case 0:
2010                 /* No mode set, assume a default based on the journal
2011                    capabilities: ORDERED_DATA if the journal can
2012                    cope, else JOURNAL_DATA */
2013                 if (journal_check_available_features
2014                     (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
2015                         set_opt(sbi->s_mount_opt, DEFAULT_DATA_MODE);
2016                 else
2017                         set_opt(sbi->s_mount_opt, JOURNAL_DATA);
2018                 break;
2019
2020         case EXT3_MOUNT_ORDERED_DATA:
2021         case EXT3_MOUNT_WRITEBACK_DATA:
2022                 if (!journal_check_available_features
2023                     (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
2024                         ext3_msg(sb, KERN_ERR,
2025                                 "error: journal does not support "
2026                                 "requested data journaling mode");
2027                         goto failed_mount3;
2028                 }
2029         default:
2030                 break;
2031         }
2032
2033         /*
2034          * The journal_load will have done any necessary log recovery,
2035          * so we can safely mount the rest of the filesystem now.
2036          */
2037
2038         root = ext3_iget(sb, EXT3_ROOT_INO);
2039         if (IS_ERR(root)) {
2040                 ext3_msg(sb, KERN_ERR, "error: get root inode failed");
2041                 ret = PTR_ERR(root);
2042                 goto failed_mount3;
2043         }
2044         if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
2045                 iput(root);
2046                 ext3_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck");
2047                 goto failed_mount3;
2048         }
2049         sb->s_root = d_make_root(root);
2050         if (!sb->s_root) {
2051                 ext3_msg(sb, KERN_ERR, "error: get root dentry failed");
2052                 ret = -ENOMEM;
2053                 goto failed_mount3;
2054         }
2055
2056         if (ext3_setup_super(sb, es, sb->s_flags & MS_RDONLY))
2057                 sb->s_flags |= MS_RDONLY;
2058
2059         EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
2060         ext3_orphan_cleanup(sb, es);
2061         EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
2062         if (needs_recovery) {
2063                 ext3_mark_recovery_complete(sb, es);
2064                 ext3_msg(sb, KERN_INFO, "recovery complete");
2065         }
2066         ext3_msg(sb, KERN_INFO, "mounted filesystem with %s data mode",
2067                 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
2068                 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
2069                 "writeback");
2070
2071         return 0;
2072
2073 cantfind_ext3:
2074         if (!silent)
2075                 ext3_msg(sb, KERN_INFO,
2076                         "error: can't find ext3 filesystem on dev %s.",
2077                        sb->s_id);
2078         goto failed_mount;
2079
2080 failed_mount3:
2081         percpu_counter_destroy(&sbi->s_freeblocks_counter);
2082         percpu_counter_destroy(&sbi->s_freeinodes_counter);
2083         percpu_counter_destroy(&sbi->s_dirs_counter);
2084         journal_destroy(sbi->s_journal);
2085 failed_mount2:
2086         for (i = 0; i < db_count; i++)
2087                 brelse(sbi->s_group_desc[i]);
2088         kfree(sbi->s_group_desc);
2089 failed_mount:
2090 #ifdef CONFIG_QUOTA
2091         for (i = 0; i < MAXQUOTAS; i++)
2092                 kfree(sbi->s_qf_names[i]);
2093 #endif
2094         ext3_blkdev_remove(sbi);
2095         brelse(bh);
2096 out_fail:
2097         sb->s_fs_info = NULL;
2098         kfree(sbi->s_blockgroup_lock);
2099         kfree(sbi);
2100         return ret;
2101 }
2102
2103 /*
2104  * Setup any per-fs journal parameters now.  We'll do this both on
2105  * initial mount, once the journal has been initialised but before we've
2106  * done any recovery; and again on any subsequent remount.
2107  */
2108 static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
2109 {
2110         struct ext3_sb_info *sbi = EXT3_SB(sb);
2111
2112         if (sbi->s_commit_interval)
2113                 journal->j_commit_interval = sbi->s_commit_interval;
2114         /* We could also set up an ext3-specific default for the commit
2115          * interval here, but for now we'll just fall back to the jbd
2116          * default. */
2117
2118         spin_lock(&journal->j_state_lock);
2119         if (test_opt(sb, BARRIER))
2120                 journal->j_flags |= JFS_BARRIER;
2121         else
2122                 journal->j_flags &= ~JFS_BARRIER;
2123         if (test_opt(sb, DATA_ERR_ABORT))
2124                 journal->j_flags |= JFS_ABORT_ON_SYNCDATA_ERR;
2125         else
2126                 journal->j_flags &= ~JFS_ABORT_ON_SYNCDATA_ERR;
2127         spin_unlock(&journal->j_state_lock);
2128 }
2129
2130 static journal_t *ext3_get_journal(struct super_block *sb,
2131                                    unsigned int journal_inum)
2132 {
2133         struct inode *journal_inode;
2134         journal_t *journal;
2135
2136         /* First, test for the existence of a valid inode on disk.  Bad
2137          * things happen if we iget() an unused inode, as the subsequent
2138          * iput() will try to delete it. */
2139
2140         journal_inode = ext3_iget(sb, journal_inum);
2141         if (IS_ERR(journal_inode)) {
2142                 ext3_msg(sb, KERN_ERR, "error: no journal found");
2143                 return NULL;
2144         }
2145         if (!journal_inode->i_nlink) {
2146                 make_bad_inode(journal_inode);
2147                 iput(journal_inode);
2148                 ext3_msg(sb, KERN_ERR, "error: journal inode is deleted");
2149                 return NULL;
2150         }
2151
2152         jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2153                   journal_inode, journal_inode->i_size);
2154         if (!S_ISREG(journal_inode->i_mode)) {
2155                 ext3_msg(sb, KERN_ERR, "error: invalid journal inode");
2156                 iput(journal_inode);
2157                 return NULL;
2158         }
2159
2160         journal = journal_init_inode(journal_inode);
2161         if (!journal) {
2162                 ext3_msg(sb, KERN_ERR, "error: could not load journal inode");
2163                 iput(journal_inode);
2164                 return NULL;
2165         }
2166         journal->j_private = sb;
2167         ext3_init_journal_params(sb, journal);
2168         return journal;
2169 }
2170
2171 static journal_t *ext3_get_dev_journal(struct super_block *sb,
2172                                        dev_t j_dev)
2173 {
2174         struct buffer_head * bh;
2175         journal_t *journal;
2176         ext3_fsblk_t start;
2177         ext3_fsblk_t len;
2178         int hblock, blocksize;
2179         ext3_fsblk_t sb_block;
2180         unsigned long offset;
2181         struct ext3_super_block * es;
2182         struct block_device *bdev;
2183
2184         bdev = ext3_blkdev_get(j_dev, sb);
2185         if (bdev == NULL)
2186                 return NULL;
2187
2188         blocksize = sb->s_blocksize;
2189         hblock = bdev_logical_block_size(bdev);
2190         if (blocksize < hblock) {
2191                 ext3_msg(sb, KERN_ERR,
2192                         "error: blocksize too small for journal device");
2193                 goto out_bdev;
2194         }
2195
2196         sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
2197         offset = EXT3_MIN_BLOCK_SIZE % blocksize;
2198         set_blocksize(bdev, blocksize);
2199         if (!(bh = __bread(bdev, sb_block, blocksize))) {
2200                 ext3_msg(sb, KERN_ERR, "error: couldn't read superblock of "
2201                         "external journal");
2202                 goto out_bdev;
2203         }
2204
2205         es = (struct ext3_super_block *) (bh->b_data + offset);
2206         if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
2207             !(le32_to_cpu(es->s_feature_incompat) &
2208               EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2209                 ext3_msg(sb, KERN_ERR, "error: external journal has "
2210                         "bad superblock");
2211                 brelse(bh);
2212                 goto out_bdev;
2213         }
2214
2215         if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2216                 ext3_msg(sb, KERN_ERR, "error: journal UUID does not match");
2217                 brelse(bh);
2218                 goto out_bdev;
2219         }
2220
2221         len = le32_to_cpu(es->s_blocks_count);
2222         start = sb_block + 1;
2223         brelse(bh);     /* we're done with the superblock */
2224
2225         journal = journal_init_dev(bdev, sb->s_bdev,
2226                                         start, len, blocksize);
2227         if (!journal) {
2228                 ext3_msg(sb, KERN_ERR,
2229                         "error: failed to create device journal");
2230                 goto out_bdev;
2231         }
2232         journal->j_private = sb;
2233         if (!bh_uptodate_or_lock(journal->j_sb_buffer)) {
2234                 if (bh_submit_read(journal->j_sb_buffer)) {
2235                         ext3_msg(sb, KERN_ERR, "I/O error on journal device");
2236                         goto out_journal;
2237                 }
2238         }
2239         if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
2240                 ext3_msg(sb, KERN_ERR,
2241                         "error: external journal has more than one "
2242                         "user (unsupported) - %d",
2243                         be32_to_cpu(journal->j_superblock->s_nr_users));
2244                 goto out_journal;
2245         }
2246         EXT3_SB(sb)->journal_bdev = bdev;
2247         ext3_init_journal_params(sb, journal);
2248         return journal;
2249 out_journal:
2250         journal_destroy(journal);
2251 out_bdev:
2252         ext3_blkdev_put(bdev);
2253         return NULL;
2254 }
2255
2256 static int ext3_load_journal(struct super_block *sb,
2257                              struct ext3_super_block *es,
2258                              unsigned long journal_devnum)
2259 {
2260         journal_t *journal;
2261         unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2262         dev_t journal_dev;
2263         int err = 0;
2264         int really_read_only;
2265
2266         if (journal_devnum &&
2267             journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2268                 ext3_msg(sb, KERN_INFO, "external journal device major/minor "
2269                         "numbers have changed");
2270                 journal_dev = new_decode_dev(journal_devnum);
2271         } else
2272                 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2273
2274         really_read_only = bdev_read_only(sb->s_bdev);
2275
2276         /*
2277          * Are we loading a blank journal or performing recovery after a
2278          * crash?  For recovery, we need to check in advance whether we
2279          * can get read-write access to the device.
2280          */
2281
2282         if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
2283                 if (sb->s_flags & MS_RDONLY) {
2284                         ext3_msg(sb, KERN_INFO,
2285                                 "recovery required on readonly filesystem");
2286                         if (really_read_only) {
2287                                 ext3_msg(sb, KERN_ERR, "error: write access "
2288                                         "unavailable, cannot proceed");
2289                                 return -EROFS;
2290                         }
2291                         ext3_msg(sb, KERN_INFO,
2292                                 "write access will be enabled during recovery");
2293                 }
2294         }
2295
2296         if (journal_inum && journal_dev) {
2297                 ext3_msg(sb, KERN_ERR, "error: filesystem has both journal "
2298                        "and inode journals");
2299                 return -EINVAL;
2300         }
2301
2302         if (journal_inum) {
2303                 if (!(journal = ext3_get_journal(sb, journal_inum)))
2304                         return -EINVAL;
2305         } else {
2306                 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
2307                         return -EINVAL;
2308         }
2309
2310         if (!(journal->j_flags & JFS_BARRIER))
2311                 printk(KERN_INFO "EXT3-fs: barriers not enabled\n");
2312
2313         if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2314                 err = journal_update_format(journal);
2315                 if (err)  {
2316                         ext3_msg(sb, KERN_ERR, "error updating journal");
2317                         journal_destroy(journal);
2318                         return err;
2319                 }
2320         }
2321
2322         if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
2323                 err = journal_wipe(journal, !really_read_only);
2324         if (!err)
2325                 err = journal_load(journal);
2326
2327         if (err) {
2328                 ext3_msg(sb, KERN_ERR, "error loading journal");
2329                 journal_destroy(journal);
2330                 return err;
2331         }
2332
2333         EXT3_SB(sb)->s_journal = journal;
2334         ext3_clear_journal_err(sb, es);
2335
2336         if (!really_read_only && journal_devnum &&
2337             journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2338                 es->s_journal_dev = cpu_to_le32(journal_devnum);
2339
2340                 /* Make sure we flush the recovery flag to disk. */
2341                 ext3_commit_super(sb, es, 1);
2342         }
2343
2344         return 0;
2345 }
2346
2347 static int ext3_create_journal(struct super_block *sb,
2348                                struct ext3_super_block *es,
2349                                unsigned int journal_inum)
2350 {
2351         journal_t *journal;
2352         int err;
2353
2354         if (sb->s_flags & MS_RDONLY) {
2355                 ext3_msg(sb, KERN_ERR,
2356                         "error: readonly filesystem when trying to "
2357                         "create journal");
2358                 return -EROFS;
2359         }
2360
2361         journal = ext3_get_journal(sb, journal_inum);
2362         if (!journal)
2363                 return -EINVAL;
2364
2365         ext3_msg(sb, KERN_INFO, "creating new journal on inode %u",
2366                journal_inum);
2367
2368         err = journal_create(journal);
2369         if (err) {
2370                 ext3_msg(sb, KERN_ERR, "error creating journal");
2371                 journal_destroy(journal);
2372                 return -EIO;
2373         }
2374
2375         EXT3_SB(sb)->s_journal = journal;
2376
2377         ext3_update_dynamic_rev(sb);
2378         EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2379         EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2380
2381         es->s_journal_inum = cpu_to_le32(journal_inum);
2382
2383         /* Make sure we flush the recovery flag to disk. */
2384         ext3_commit_super(sb, es, 1);
2385
2386         return 0;
2387 }
2388
2389 static int ext3_commit_super(struct super_block *sb,
2390                                struct ext3_super_block *es,
2391                                int sync)
2392 {
2393         struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
2394         int error = 0;
2395
2396         if (!sbh)
2397                 return error;
2398
2399         if (buffer_write_io_error(sbh)) {
2400                 /*
2401                  * Oh, dear.  A previous attempt to write the
2402                  * superblock failed.  This could happen because the
2403                  * USB device was yanked out.  Or it could happen to
2404                  * be a transient write error and maybe the block will
2405                  * be remapped.  Nothing we can do but to retry the
2406                  * write and hope for the best.
2407                  */
2408                 ext3_msg(sb, KERN_ERR, "previous I/O error to "
2409                        "superblock detected");
2410                 clear_buffer_write_io_error(sbh);
2411                 set_buffer_uptodate(sbh);
2412         }
2413         /*
2414          * If the file system is mounted read-only, don't update the
2415          * superblock write time.  This avoids updating the superblock
2416          * write time when we are mounting the root file system
2417          * read/only but we need to replay the journal; at that point,
2418          * for people who are east of GMT and who make their clock
2419          * tick in localtime for Windows bug-for-bug compatibility,
2420          * the clock is set in the future, and this will cause e2fsck
2421          * to complain and force a full file system check.
2422          */
2423         if (!(sb->s_flags & MS_RDONLY))
2424                 es->s_wtime = cpu_to_le32(get_seconds());
2425         es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2426         es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2427         BUFFER_TRACE(sbh, "marking dirty");
2428         mark_buffer_dirty(sbh);
2429         if (sync) {
2430                 error = sync_dirty_buffer(sbh);
2431                 if (buffer_write_io_error(sbh)) {
2432                         ext3_msg(sb, KERN_ERR, "I/O error while writing "
2433                                "superblock");
2434                         clear_buffer_write_io_error(sbh);
2435                         set_buffer_uptodate(sbh);
2436                 }
2437         }
2438         return error;
2439 }
2440
2441
2442 /*
2443  * Have we just finished recovery?  If so, and if we are mounting (or
2444  * remounting) the filesystem readonly, then we will end up with a
2445  * consistent fs on disk.  Record that fact.
2446  */
2447 static void ext3_mark_recovery_complete(struct super_block * sb,
2448                                         struct ext3_super_block * es)
2449 {
2450         journal_t *journal = EXT3_SB(sb)->s_journal;
2451
2452         journal_lock_updates(journal);
2453         if (journal_flush(journal) < 0)
2454                 goto out;
2455
2456         if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2457             sb->s_flags & MS_RDONLY) {
2458                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2459                 ext3_commit_super(sb, es, 1);
2460         }
2461
2462 out:
2463         journal_unlock_updates(journal);
2464 }
2465
2466 /*
2467  * If we are mounting (or read-write remounting) a filesystem whose journal
2468  * has recorded an error from a previous lifetime, move that error to the
2469  * main filesystem now.
2470  */
2471 static void ext3_clear_journal_err(struct super_block *sb,
2472                                    struct ext3_super_block *es)
2473 {
2474         journal_t *journal;
2475         int j_errno;
2476         const char *errstr;
2477
2478         journal = EXT3_SB(sb)->s_journal;
2479
2480         /*
2481          * Now check for any error status which may have been recorded in the
2482          * journal by a prior ext3_error() or ext3_abort()
2483          */
2484
2485         j_errno = journal_errno(journal);
2486         if (j_errno) {
2487                 char nbuf[16];
2488
2489                 errstr = ext3_decode_error(sb, j_errno, nbuf);
2490                 ext3_warning(sb, __func__, "Filesystem error recorded "
2491                              "from previous mount: %s", errstr);
2492                 ext3_warning(sb, __func__, "Marking fs in need of "
2493                              "filesystem check.");
2494
2495                 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2496                 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2497                 ext3_commit_super (sb, es, 1);
2498
2499                 journal_clear_err(journal);
2500         }
2501 }
2502
2503 /*
2504  * Force the running and committing transactions to commit,
2505  * and wait on the commit.
2506  */
2507 int ext3_force_commit(struct super_block *sb)
2508 {
2509         journal_t *journal;
2510         int ret;
2511
2512         if (sb->s_flags & MS_RDONLY)
2513                 return 0;
2514
2515         journal = EXT3_SB(sb)->s_journal;
2516         ret = ext3_journal_force_commit(journal);
2517         return ret;
2518 }
2519
2520 static int ext3_sync_fs(struct super_block *sb, int wait)
2521 {
2522         tid_t target;
2523
2524         trace_ext3_sync_fs(sb, wait);
2525         /*
2526          * Writeback quota in non-journalled quota case - journalled quota has
2527          * no dirty dquots
2528          */
2529         dquot_writeback_dquots(sb, -1);
2530         if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2531                 if (wait)
2532                         log_wait_commit(EXT3_SB(sb)->s_journal, target);
2533         }
2534         return 0;
2535 }
2536
2537 /*
2538  * LVM calls this function before a (read-only) snapshot is created.  This
2539  * gives us a chance to flush the journal completely and mark the fs clean.
2540  */
2541 static int ext3_freeze(struct super_block *sb)
2542 {
2543         int error = 0;
2544         journal_t *journal;
2545
2546         if (!(sb->s_flags & MS_RDONLY)) {
2547                 journal = EXT3_SB(sb)->s_journal;
2548
2549                 /* Now we set up the journal barrier. */
2550                 journal_lock_updates(journal);
2551
2552                 /*
2553                  * We don't want to clear needs_recovery flag when we failed
2554                  * to flush the journal.
2555                  */
2556                 error = journal_flush(journal);
2557                 if (error < 0)
2558                         goto out;
2559
2560                 /* Journal blocked and flushed, clear needs_recovery flag. */
2561                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2562                 error = ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2563                 if (error)
2564                         goto out;
2565         }
2566         return 0;
2567
2568 out:
2569         journal_unlock_updates(journal);
2570         return error;
2571 }
2572
2573 /*
2574  * Called by LVM after the snapshot is done.  We need to reset the RECOVER
2575  * flag here, even though the filesystem is not technically dirty yet.
2576  */
2577 static int ext3_unfreeze(struct super_block *sb)
2578 {
2579         if (!(sb->s_flags & MS_RDONLY)) {
2580                 /* Reser the needs_recovery flag before the fs is unlocked. */
2581                 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2582                 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2583                 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2584         }
2585         return 0;
2586 }
2587
2588 static int ext3_remount (struct super_block * sb, int * flags, char * data)
2589 {
2590         struct ext3_super_block * es;
2591         struct ext3_sb_info *sbi = EXT3_SB(sb);
2592         ext3_fsblk_t n_blocks_count = 0;
2593         unsigned long old_sb_flags;
2594         struct ext3_mount_options old_opts;
2595         int enable_quota = 0;
2596         int err;
2597 #ifdef CONFIG_QUOTA
2598         int i;
2599 #endif
2600
2601         /* Store the original options */
2602         old_sb_flags = sb->s_flags;
2603         old_opts.s_mount_opt = sbi->s_mount_opt;
2604         old_opts.s_resuid = sbi->s_resuid;
2605         old_opts.s_resgid = sbi->s_resgid;
2606         old_opts.s_commit_interval = sbi->s_commit_interval;
2607 #ifdef CONFIG_QUOTA
2608         old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2609         for (i = 0; i < MAXQUOTAS; i++)
2610                 if (sbi->s_qf_names[i]) {
2611                         old_opts.s_qf_names[i] = kstrdup(sbi->s_qf_names[i],
2612                                                          GFP_KERNEL);
2613                         if (!old_opts.s_qf_names[i]) {
2614                                 int j;
2615
2616                                 for (j = 0; j < i; j++)
2617                                         kfree(old_opts.s_qf_names[j]);
2618                                 return -ENOMEM;
2619                         }
2620                 } else
2621                         old_opts.s_qf_names[i] = NULL;
2622 #endif
2623
2624         /*
2625          * Allow the "check" option to be passed as a remount option.
2626          */
2627         if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2628                 err = -EINVAL;
2629                 goto restore_opts;
2630         }
2631
2632         if (test_opt(sb, ABORT))
2633                 ext3_abort(sb, __func__, "Abort forced by user");
2634
2635         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2636                 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
2637
2638         es = sbi->s_es;
2639
2640         ext3_init_journal_params(sb, sbi->s_journal);
2641
2642         if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2643                 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
2644                 if (test_opt(sb, ABORT)) {
2645                         err = -EROFS;
2646                         goto restore_opts;
2647                 }
2648
2649                 if (*flags & MS_RDONLY) {
2650                         err = dquot_suspend(sb, -1);
2651                         if (err < 0)
2652                                 goto restore_opts;
2653
2654                         /*
2655                          * First of all, the unconditional stuff we have to do
2656                          * to disable replay of the journal when we next remount
2657                          */
2658                         sb->s_flags |= MS_RDONLY;
2659
2660                         /*
2661                          * OK, test if we are remounting a valid rw partition
2662                          * readonly, and if so set the rdonly flag and then
2663                          * mark the partition as valid again.
2664                          */
2665                         if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2666                             (sbi->s_mount_state & EXT3_VALID_FS))
2667                                 es->s_state = cpu_to_le16(sbi->s_mount_state);
2668
2669                         ext3_mark_recovery_complete(sb, es);
2670                 } else {
2671                         __le32 ret;
2672                         if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2673                                         ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2674                                 ext3_msg(sb, KERN_WARNING,
2675                                         "warning: couldn't remount RDWR "
2676                                         "because of unsupported optional "
2677                                         "features (%x)", le32_to_cpu(ret));
2678                                 err = -EROFS;
2679                                 goto restore_opts;
2680                         }
2681
2682                         /*
2683                          * If we have an unprocessed orphan list hanging
2684                          * around from a previously readonly bdev mount,
2685                          * require a full umount & mount for now.
2686                          */
2687                         if (es->s_last_orphan) {
2688                                 ext3_msg(sb, KERN_WARNING, "warning: couldn't "
2689                                        "remount RDWR because of unprocessed "
2690                                        "orphan inode list.  Please "
2691                                        "umount & mount instead.");
2692                                 err = -EINVAL;
2693                                 goto restore_opts;
2694                         }
2695
2696                         /*
2697                          * Mounting a RDONLY partition read-write, so reread
2698                          * and store the current valid flag.  (It may have
2699                          * been changed by e2fsck since we originally mounted
2700                          * the partition.)
2701                          */
2702                         ext3_clear_journal_err(sb, es);
2703                         sbi->s_mount_state = le16_to_cpu(es->s_state);
2704                         if ((err = ext3_group_extend(sb, es, n_blocks_count)))
2705                                 goto restore_opts;
2706                         if (!ext3_setup_super (sb, es, 0))
2707                                 sb->s_flags &= ~MS_RDONLY;
2708                         enable_quota = 1;
2709                 }
2710         }
2711 #ifdef CONFIG_QUOTA
2712         /* Release old quota file names */
2713         for (i = 0; i < MAXQUOTAS; i++)
2714                 kfree(old_opts.s_qf_names[i]);
2715 #endif
2716         if (enable_quota)
2717                 dquot_resume(sb, -1);
2718         return 0;
2719 restore_opts:
2720         sb->s_flags = old_sb_flags;
2721         sbi->s_mount_opt = old_opts.s_mount_opt;
2722         sbi->s_resuid = old_opts.s_resuid;
2723         sbi->s_resgid = old_opts.s_resgid;
2724         sbi->s_commit_interval = old_opts.s_commit_interval;
2725 #ifdef CONFIG_QUOTA
2726         sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2727         for (i = 0; i < MAXQUOTAS; i++) {
2728                 kfree(sbi->s_qf_names[i]);
2729                 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2730         }
2731 #endif
2732         return err;
2733 }
2734
2735 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
2736 {
2737         struct super_block *sb = dentry->d_sb;
2738         struct ext3_sb_info *sbi = EXT3_SB(sb);
2739         struct ext3_super_block *es = sbi->s_es;
2740         u64 fsid;
2741
2742         if (test_opt(sb, MINIX_DF)) {
2743                 sbi->s_overhead_last = 0;
2744         } else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
2745                 unsigned long ngroups = sbi->s_groups_count, i;
2746                 ext3_fsblk_t overhead = 0;
2747                 smp_rmb();
2748
2749                 /*
2750                  * Compute the overhead (FS structures).  This is constant
2751                  * for a given filesystem unless the number of block groups
2752                  * changes so we cache the previous value until it does.
2753                  */
2754
2755                 /*
2756                  * All of the blocks before first_data_block are
2757                  * overhead
2758                  */
2759                 overhead = le32_to_cpu(es->s_first_data_block);
2760
2761                 /*
2762                  * Add the overhead attributed to the superblock and
2763                  * block group descriptors.  If the sparse superblocks
2764                  * feature is turned on, then not all groups have this.
2765                  */
2766                 for (i = 0; i < ngroups; i++) {
2767                         overhead += ext3_bg_has_super(sb, i) +
2768                                 ext3_bg_num_gdb(sb, i);
2769                         cond_resched();
2770                 }
2771
2772                 /*
2773                  * Every block group has an inode bitmap, a block
2774                  * bitmap, and an inode table.
2775                  */
2776                 overhead += ngroups * (2 + sbi->s_itb_per_group);
2777                 sbi->s_overhead_last = overhead;
2778                 smp_wmb();
2779                 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
2780         }
2781
2782         buf->f_type = EXT3_SUPER_MAGIC;
2783         buf->f_bsize = sb->s_blocksize;
2784         buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
2785         buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
2786         buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2787         if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2788                 buf->f_bavail = 0;
2789         buf->f_files = le32_to_cpu(es->s_inodes_count);
2790         buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
2791         buf->f_namelen = EXT3_NAME_LEN;
2792         fsid = le64_to_cpup((void *)es->s_uuid) ^
2793                le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2794         buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2795         buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
2796         return 0;
2797 }
2798
2799 /* Helper function for writing quotas on sync - we need to start transaction before quota file
2800  * is locked for write. Otherwise the are possible deadlocks:
2801  * Process 1                         Process 2
2802  * ext3_create()                     quota_sync()
2803  *   journal_start()                   write_dquot()
2804  *   dquot_initialize()                       down(dqio_mutex)
2805  *     down(dqio_mutex)                    journal_start()
2806  *
2807  */
2808
2809 #ifdef CONFIG_QUOTA
2810
2811 static inline struct inode *dquot_to_inode(struct dquot *dquot)
2812 {
2813         return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
2814 }
2815
2816 static int ext3_write_dquot(struct dquot *dquot)
2817 {
2818         int ret, err;
2819         handle_t *handle;
2820         struct inode *inode;
2821
2822         inode = dquot_to_inode(dquot);
2823         handle = ext3_journal_start(inode,
2824                                         EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2825         if (IS_ERR(handle))
2826                 return PTR_ERR(handle);
2827         ret = dquot_commit(dquot);
2828         err = ext3_journal_stop(handle);
2829         if (!ret)
2830                 ret = err;
2831         return ret;
2832 }
2833
2834 static int ext3_acquire_dquot(struct dquot *dquot)
2835 {
2836         int ret, err;
2837         handle_t *handle;
2838
2839         handle = ext3_journal_start(dquot_to_inode(dquot),
2840                                         EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2841         if (IS_ERR(handle))
2842                 return PTR_ERR(handle);
2843         ret = dquot_acquire(dquot);
2844         err = ext3_journal_stop(handle);
2845         if (!ret)
2846                 ret = err;
2847         return ret;
2848 }
2849
2850 static int ext3_release_dquot(struct dquot *dquot)
2851 {
2852         int ret, err;
2853         handle_t *handle;
2854
2855         handle = ext3_journal_start(dquot_to_inode(dquot),
2856                                         EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2857         if (IS_ERR(handle)) {
2858                 /* Release dquot anyway to avoid endless cycle in dqput() */
2859                 dquot_release(dquot);
2860                 return PTR_ERR(handle);
2861         }
2862         ret = dquot_release(dquot);
2863         err = ext3_journal_stop(handle);
2864         if (!ret)
2865                 ret = err;
2866         return ret;
2867 }
2868
2869 static int ext3_mark_dquot_dirty(struct dquot *dquot)
2870 {
2871         /* Are we journaling quotas? */
2872         if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2873             EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2874                 dquot_mark_dquot_dirty(dquot);
2875                 return ext3_write_dquot(dquot);
2876         } else {
2877                 return dquot_mark_dquot_dirty(dquot);
2878         }
2879 }
2880
2881 static int ext3_write_info(struct super_block *sb, int type)
2882 {
2883         int ret, err;
2884         handle_t *handle;
2885
2886         /* Data block + inode block */
2887         handle = ext3_journal_start(sb->s_root->d_inode, 2);
2888         if (IS_ERR(handle))
2889                 return PTR_ERR(handle);
2890         ret = dquot_commit_info(sb, type);
2891         err = ext3_journal_stop(handle);
2892         if (!ret)
2893                 ret = err;
2894         return ret;
2895 }
2896
2897 /*
2898  * Turn on quotas during mount time - we need to find
2899  * the quota file and such...
2900  */
2901 static int ext3_quota_on_mount(struct super_block *sb, int type)
2902 {
2903         return dquot_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2904                                         EXT3_SB(sb)->s_jquota_fmt, type);
2905 }
2906
2907 /*
2908  * Standard function to be called on quota_on
2909  */
2910 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
2911                          struct path *path)
2912 {
2913         int err;
2914
2915         if (!test_opt(sb, QUOTA))
2916                 return -EINVAL;
2917
2918         /* Quotafile not on the same filesystem? */
2919         if (path->dentry->d_sb != sb)
2920                 return -EXDEV;
2921         /* Journaling quota? */
2922         if (EXT3_SB(sb)->s_qf_names[type]) {
2923                 /* Quotafile not of fs root? */
2924                 if (path->dentry->d_parent != sb->s_root)
2925                         ext3_msg(sb, KERN_WARNING,
2926                                 "warning: Quota file not on filesystem root. "
2927                                 "Journaled quota will not work.");
2928         }
2929
2930         /*
2931          * When we journal data on quota file, we have to flush journal to see
2932          * all updates to the file when we bypass pagecache...
2933          */
2934         if (ext3_should_journal_data(path->dentry->d_inode)) {
2935                 /*
2936                  * We don't need to lock updates but journal_flush() could
2937                  * otherwise be livelocked...
2938                  */
2939                 journal_lock_updates(EXT3_SB(sb)->s_journal);
2940                 err = journal_flush(EXT3_SB(sb)->s_journal);
2941                 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2942                 if (err)
2943                         return err;
2944         }
2945
2946         return dquot_quota_on(sb, type, format_id, path);
2947 }
2948
2949 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2950  * acquiring the locks... As quota files are never truncated and quota code
2951  * itself serializes the operations (and no one else should touch the files)
2952  * we don't have to be afraid of races */
2953 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2954                                size_t len, loff_t off)
2955 {
2956         struct inode *inode = sb_dqopt(sb)->files[type];
2957         sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2958         int err = 0;
2959         int offset = off & (sb->s_blocksize - 1);
2960         int tocopy;
2961         size_t toread;
2962         struct buffer_head *bh;
2963         loff_t i_size = i_size_read(inode);
2964
2965         if (off > i_size)
2966                 return 0;
2967         if (off+len > i_size)
2968                 len = i_size-off;
2969         toread = len;
2970         while (toread > 0) {
2971                 tocopy = sb->s_blocksize - offset < toread ?
2972                                 sb->s_blocksize - offset : toread;
2973                 bh = ext3_bread(NULL, inode, blk, 0, &err);
2974                 if (err)
2975                         return err;
2976                 if (!bh)        /* A hole? */
2977                         memset(data, 0, tocopy);
2978                 else
2979                         memcpy(data, bh->b_data+offset, tocopy);
2980                 brelse(bh);
2981                 offset = 0;
2982                 toread -= tocopy;
2983                 data += tocopy;
2984                 blk++;
2985         }
2986         return len;
2987 }
2988
2989 /* Write to quotafile (we know the transaction is already started and has
2990  * enough credits) */
2991 static ssize_t ext3_quota_write(struct super_block *sb, int type,
2992                                 const char *data, size_t len, loff_t off)
2993 {
2994         struct inode *inode = sb_dqopt(sb)->files[type];
2995         sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2996         int err = 0;
2997         int offset = off & (sb->s_blocksize - 1);
2998         int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
2999         struct buffer_head *bh;
3000         handle_t *handle = journal_current_handle();
3001
3002         if (!handle) {
3003                 ext3_msg(sb, KERN_WARNING,
3004                         "warning: quota write (off=%llu, len=%llu)"
3005                         " cancelled because transaction is not started.",
3006                         (unsigned long long)off, (unsigned long long)len);
3007                 return -EIO;
3008         }
3009
3010         /*
3011          * Since we account only one data block in transaction credits,
3012          * then it is impossible to cross a block boundary.
3013          */
3014         if (sb->s_blocksize - offset < len) {
3015                 ext3_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
3016                         " cancelled because not block aligned",
3017                         (unsigned long long)off, (unsigned long long)len);
3018                 return -EIO;
3019         }
3020         bh = ext3_bread(handle, inode, blk, 1, &err);
3021         if (!bh)
3022                 goto out;
3023         if (journal_quota) {
3024                 err = ext3_journal_get_write_access(handle, bh);
3025                 if (err) {
3026                         brelse(bh);
3027                         goto out;
3028                 }
3029         }
3030         lock_buffer(bh);
3031         memcpy(bh->b_data+offset, data, len);
3032         flush_dcache_page(bh->b_page);
3033         unlock_buffer(bh);
3034         if (journal_quota)
3035                 err = ext3_journal_dirty_metadata(handle, bh);
3036         else {
3037                 /* Always do at least ordered writes for quotas */
3038                 err = ext3_journal_dirty_data(handle, bh);
3039                 mark_buffer_dirty(bh);
3040         }
3041         brelse(bh);
3042 out:
3043         if (err)
3044                 return err;
3045         if (inode->i_size < off + len) {
3046                 i_size_write(inode, off + len);
3047                 EXT3_I(inode)->i_disksize = inode->i_size;
3048         }
3049         inode->i_version++;
3050         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
3051         ext3_mark_inode_dirty(handle, inode);
3052         return len;
3053 }
3054
3055 #endif
3056
3057 static struct dentry *ext3_mount(struct file_system_type *fs_type,
3058         int flags, const char *dev_name, void *data)
3059 {
3060         return mount_bdev(fs_type, flags, dev_name, data, ext3_fill_super);
3061 }
3062
3063 static struct file_system_type ext3_fs_type = {
3064         .owner          = THIS_MODULE,
3065         .name           = "ext3",
3066         .mount          = ext3_mount,
3067         .kill_sb        = kill_block_super,
3068         .fs_flags       = FS_REQUIRES_DEV,
3069 };
3070
3071 static int __init init_ext3_fs(void)
3072 {
3073         int err = init_ext3_xattr();
3074         if (err)
3075                 return err;
3076         err = init_inodecache();
3077         if (err)
3078                 goto out1;
3079         err = register_filesystem(&ext3_fs_type);
3080         if (err)
3081                 goto out;
3082         return 0;
3083 out:
3084         destroy_inodecache();
3085 out1:
3086         exit_ext3_xattr();
3087         return err;
3088 }
3089
3090 static void __exit exit_ext3_fs(void)
3091 {
3092         unregister_filesystem(&ext3_fs_type);
3093         destroy_inodecache();
3094         exit_ext3_xattr();
3095 }
3096
3097 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
3098 MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
3099 MODULE_LICENSE("GPL");
3100 module_init(init_ext3_fs)
3101 module_exit(exit_ext3_fs)