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/string.h>
  21 #include <linux/fs.h>
  22 #include <linux/time.h>
  23 #include <linux/jbd.h>
  24 #include <linux/ext3_fs.h>
  25 #include <linux/ext3_jbd.h>
  26 #include <linux/slab.h>
  27 #include <linux/init.h>
  28 #include <linux/blkdev.h>
  29 #include <linux/parser.h>
  30 #include <linux/smp_lock.h>
  31 #include <linux/buffer_head.h>
  32 #include <linux/exportfs.h>
  33 #include <linux/vfs.h>
  34 #include <linux/random.h>
  35 #include <linux/mount.h>
  36 #include <linux/namei.h>
  37 #include <linux/quotaops.h>
  38 #include <linux/seq_file.h>
  39 #include <linux/log2.h>
  40
  41 #include <asm/uaccess.h>
  42
  43 #include "xattr.h"
  44 #include "acl.h"
  45 #include "namei.h"
  46
  47 #ifdef CONFIG_EXT3_DEFAULTS_TO_ORDERED
  48   #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_ORDERED_DATA
  49 #else
  50   #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_WRITEBACK_DATA
  51 #endif
  52
  53 static int ext3_load_journal(struct super_block *, struct ext3_super_block *,
  54                              unsigned long journal_devnum);
  55 static int ext3_create_journal(struct super_block *, struct ext3_super_block *,
  56                                unsigned int);
  57 static int ext3_commit_super(struct super_block *sb,
  58                                struct ext3_super_block *es,
  59                                int sync);
  60 static void ext3_mark_recovery_complete(struct super_block * sb,
  61                                         struct ext3_super_block * es);
  62 static void ext3_clear_journal_err(struct super_block * sb,
  63                                    struct ext3_super_block * es);
  64 static int ext3_sync_fs(struct super_block *sb, int wait);
  65 static const char *ext3_decode_error(struct super_block * sb, int errno,
  66                                      char nbuf[16]);
  67 static int ext3_remount (struct super_block * sb, int * flags, char * data);
  68 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf);
  69 static int ext3_unfreeze(struct super_block *sb);
  70 static int ext3_freeze(struct super_block *sb);
  71
  72 /*
  73  * Wrappers for journal_start/end.
  74  *
  75  * The only special thing we need to do here is to make sure that all
  76  * journal_end calls result in the superblock being marked dirty, so
  77  * that sync() will call the filesystem's write_super callback if
  78  * appropriate.
  79  */
  80 handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks)
  81 {
  82         journal_t *journal;
  83
  84         if (sb->s_flags & MS_RDONLY)
  85                 return ERR_PTR(-EROFS);
  86
  87         /* Special case here: if the journal has aborted behind our
  88          * backs (eg. EIO in the commit thread), then we still need to
  89          * take the FS itself readonly cleanly. */
  90         journal = EXT3_SB(sb)->s_journal;
  91         if (is_journal_aborted(journal)) {
  92                 ext3_abort(sb, __func__,
  93                            "Detected aborted journal");
  94                 return ERR_PTR(-EROFS);
  95         }
  96
  97         return journal_start(journal, nblocks);
  98 }
  99
 100 /*
 101  * The only special thing we need to do here is to make sure that all
 102  * journal_stop calls result in the superblock being marked dirty, so
 103  * that sync() will call the filesystem's write_super callback if
 104  * appropriate.
 105  */
 106 int __ext3_journal_stop(const char *where, handle_t *handle)
 107 {
 108         struct super_block *sb;
 109         int err;
 110         int rc;
 111
 112         sb = handle->h_transaction->t_journal->j_private;
 113         err = handle->h_err;
 114         rc = journal_stop(handle);
 115
 116         if (!err)
 117                 err = rc;
 118         if (err)
 119                 __ext3_std_error(sb, where, err);
 120         return err;
 121 }
 122
 123 void ext3_journal_abort_handle(const char *caller, const char *err_fn,
 124                 struct buffer_head *bh, handle_t *handle, int err)
 125 {
 126         char nbuf[16];
 127         const char *errstr = ext3_decode_error(NULL, err, nbuf);
 128
 129         if (bh)
 130                 BUFFER_TRACE(bh, "abort");
 131
 132         if (!handle->h_err)
 133                 handle->h_err = err;
 134
 135         if (is_handle_aborted(handle))
 136                 return;
 137
 138         printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
 139                caller, errstr, err_fn);
 140
 141         journal_abort_handle(handle);
 142 }
 143
 144 /* Deal with the reporting of failure conditions on a filesystem such as
 145  * inconsistencies detected or read IO failures.
 146  *
 147  * On ext2, we can store the error state of the filesystem in the
 148  * superblock.  That is not possible on ext3, because we may have other
 149  * write ordering constraints on the superblock which prevent us from
 150  * writing it out straight away; and given that the journal is about to
 151  * be aborted, we can't rely on the current, or future, transactions to
 152  * write out the superblock safely.
 153  *
 154  * We'll just use the journal_abort() error code to record an error in
 155  * the journal instead.  On recovery, the journal will compain about
 156  * that error until we've noted it down and cleared it.
 157  */
 158
 159 static void ext3_handle_error(struct super_block *sb)
 160 {
 161         struct ext3_super_block *es = EXT3_SB(sb)->s_es;
 162
 163         EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
 164         es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
 165
 166         if (sb->s_flags & MS_RDONLY)
 167                 return;
 168
 169         if (!test_opt (sb, ERRORS_CONT)) {
 170                 journal_t *journal = EXT3_SB(sb)->s_journal;
 171
 172                 EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
 173                 if (journal)
 174                         journal_abort(journal, -EIO);
 175         }
 176         if (test_opt (sb, ERRORS_RO)) {
 177                 printk (KERN_CRIT "Remounting filesystem read-only\n");
 178                 sb->s_flags |= MS_RDONLY;
 179         }
 180         ext3_commit_super(sb, es, 1);
 181         if (test_opt(sb, ERRORS_PANIC))
 182                 panic("EXT3-fs (device %s): panic forced after error\n",
 183                         sb->s_id);
 184 }
 185
 186 void ext3_error (struct super_block * sb, const char * function,
 187                  const char * fmt, ...)
 188 {
 189         va_list args;
 190
 191         va_start(args, fmt);
 192         printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
 193         vprintk(fmt, args);
 194         printk("\n");
 195         va_end(args);
 196
 197         ext3_handle_error(sb);
 198 }
 199
 200 static const char *ext3_decode_error(struct super_block * sb, int errno,
 201                                      char nbuf[16])
 202 {
 203         char *errstr = NULL;
 204
 205         switch (errno) {
 206         case -EIO:
 207                 errstr = "IO failure";
 208                 break;
 209         case -ENOMEM:
 210                 errstr = "Out of memory";
 211                 break;
 212         case -EROFS:
 213                 if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT)
 214                         errstr = "Journal has aborted";
 215                 else
 216                         errstr = "Readonly filesystem";
 217                 break;
 218         default:
 219                 /* If the caller passed in an extra buffer for unknown
 220                  * errors, textualise them now.  Else we just return
 221                  * NULL. */
 222                 if (nbuf) {
 223                         /* Check for truncated error codes... */
 224                         if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
 225                                 errstr = nbuf;
 226                 }
 227                 break;
 228         }
 229
 230         return errstr;
 231 }
 232
 233 /* __ext3_std_error decodes expected errors from journaling functions
 234  * automatically and invokes the appropriate error response.  */
 235
 236 void __ext3_std_error (struct super_block * sb, const char * function,
 237                        int errno)
 238 {
 239         char nbuf[16];
 240         const char *errstr;
 241
 242         /* Special case: if the error is EROFS, and we're not already
 243          * inside a transaction, then there's really no point in logging
 244          * an error. */
 245         if (errno == -EROFS && journal_current_handle() == NULL &&
 246             (sb->s_flags & MS_RDONLY))
 247                 return;
 248
 249         errstr = ext3_decode_error(sb, errno, nbuf);
 250         printk (KERN_CRIT "EXT3-fs error (device %s) in %s: %s\n",
 251                 sb->s_id, function, errstr);
 252
 253         ext3_handle_error(sb);
 254 }
 255
 256 /*
 257  * ext3_abort is a much stronger failure handler than ext3_error.  The
 258  * abort function may be used to deal with unrecoverable failures such
 259  * as journal IO errors or ENOMEM at a critical moment in log management.
 260  *
 261  * We unconditionally force the filesystem into an ABORT|READONLY state,
 262  * unless the error response on the fs has been set to panic in which
 263  * case we take the easy way out and panic immediately.
 264  */
 265
 266 void ext3_abort (struct super_block * sb, const char * function,
 267                  const char * fmt, ...)
 268 {
 269         va_list args;
 270
 271         printk (KERN_CRIT "ext3_abort called.\n");
 272
 273         va_start(args, fmt);
 274         printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
 275         vprintk(fmt, args);
 276         printk("\n");
 277         va_end(args);
 278
 279         if (test_opt(sb, ERRORS_PANIC))
 280                 panic("EXT3-fs panic from previous error\n");
 281
 282         if (sb->s_flags & MS_RDONLY)
 283                 return;
 284
 285         printk(KERN_CRIT "Remounting filesystem read-only\n");
 286         EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
 287         sb->s_flags |= MS_RDONLY;
 288         EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
 289         if (EXT3_SB(sb)->s_journal)
 290                 journal_abort(EXT3_SB(sb)->s_journal, -EIO);
 291 }
 292
 293 void ext3_warning (struct super_block * sb, const char * function,
 294                    const char * fmt, ...)
 295 {
 296         va_list args;
 297
 298         va_start(args, fmt);
 299         printk(KERN_WARNING "EXT3-fs warning (device %s): %s: ",
 300                sb->s_id, function);
 301         vprintk(fmt, args);
 302         printk("\n");
 303         va_end(args);
 304 }
 305
 306 void ext3_update_dynamic_rev(struct super_block *sb)
 307 {
 308         struct ext3_super_block *es = EXT3_SB(sb)->s_es;
 309
 310         if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
 311                 return;
 312
 313         ext3_warning(sb, __func__,
 314                      "updating to rev %d because of new feature flag, "
 315                      "running e2fsck is recommended",
 316                      EXT3_DYNAMIC_REV);
 317
 318         es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO);
 319         es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE);
 320         es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV);
 321         /* leave es->s_feature_*compat flags alone */
 322         /* es->s_uuid will be set by e2fsck if empty */
 323
 324         /*
 325          * The rest of the superblock fields should be zero, and if not it
 326          * means they are likely already in use, so leave them alone.  We
 327          * can leave it up to e2fsck to clean up any inconsistencies there.
 328          */
 329 }
 330
 331 /*
 332  * Open the external journal device
 333  */
 334 static struct block_device *ext3_blkdev_get(dev_t dev)
 335 {
 336         struct block_device *bdev;
 337         char b[BDEVNAME_SIZE];
 338
 339         bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
 340         if (IS_ERR(bdev))
 341                 goto fail;
 342         return bdev;
 343
 344 fail:
 345         printk(KERN_ERR "EXT3: failed to open journal device %s: %ld\n",
 346                         __bdevname(dev, b), PTR_ERR(bdev));
 347         return NULL;
 348 }
 349
 350 /*
 351  * Release the journal device
 352  */
 353 static int ext3_blkdev_put(struct block_device *bdev)
 354 {
 355         bd_release(bdev);
 356         return blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
 357 }
 358
 359 static int ext3_blkdev_remove(struct ext3_sb_info *sbi)
 360 {
 361         struct block_device *bdev;
 362         int ret = -ENODEV;
 363
 364         bdev = sbi->journal_bdev;
 365         if (bdev) {
 366                 ret = ext3_blkdev_put(bdev);
 367                 sbi->journal_bdev = NULL;
 368         }
 369         return ret;
 370 }
 371
 372 static inline struct inode *orphan_list_entry(struct list_head *l)
 373 {
 374         return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
 375 }
 376
 377 static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
 378 {
 379         struct list_head *l;
 380
 381         printk(KERN_ERR "sb orphan head is %d\n",
 382                le32_to_cpu(sbi->s_es->s_last_orphan));
 383
 384         printk(KERN_ERR "sb_info orphan list:\n");
 385         list_for_each(l, &sbi->s_orphan) {
 386                 struct inode *inode = orphan_list_entry(l);
 387                 printk(KERN_ERR "  "
 388                        "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
 389                        inode->i_sb->s_id, inode->i_ino, inode,
 390                        inode->i_mode, inode->i_nlink,
 391                        NEXT_ORPHAN(inode));
 392         }
 393 }
 394
 395 static void ext3_put_super (struct super_block * sb)
 396 {
 397         struct ext3_sb_info *sbi = EXT3_SB(sb);
 398         struct ext3_super_block *es = sbi->s_es;
 399         int i, err;
 400
 401         lock_kernel();
 402
 403         ext3_xattr_put_super(sb);
 404         err = journal_destroy(sbi->s_journal);
 405         sbi->s_journal = NULL;
 406         if (err < 0)
 407                 ext3_abort(sb, __func__, "Couldn't clean up the journal");
 408
 409         if (!(sb->s_flags & MS_RDONLY)) {
 410                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
 411                 es->s_state = cpu_to_le16(sbi->s_mount_state);
 412                 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
 413                 mark_buffer_dirty(sbi->s_sbh);
 414                 ext3_commit_super(sb, es, 1);
 415         }
 416
 417         for (i = 0; i < sbi->s_gdb_count; i++)
 418                 brelse(sbi->s_group_desc[i]);
 419         kfree(sbi->s_group_desc);
 420         percpu_counter_destroy(&sbi->s_freeblocks_counter);
 421         percpu_counter_destroy(&sbi->s_freeinodes_counter);
 422         percpu_counter_destroy(&sbi->s_dirs_counter);
 423         brelse(sbi->s_sbh);
 424 #ifdef CONFIG_QUOTA
 425         for (i = 0; i < MAXQUOTAS; i++)
 426                 kfree(sbi->s_qf_names[i]);
 427 #endif
 428
 429         /* Debugging code just in case the in-memory inode orphan list
 430          * isn't empty.  The on-disk one can be non-empty if we've
 431          * detected an error and taken the fs readonly, but the
 432          * in-memory list had better be clean by this point. */
 433         if (!list_empty(&sbi->s_orphan))
 434                 dump_orphan_list(sb, sbi);
 435         J_ASSERT(list_empty(&sbi->s_orphan));
 436
 437         invalidate_bdev(sb->s_bdev);
 438         if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
 439                 /*
 440                  * Invalidate the journal device's buffers.  We don't want them
 441                  * floating about in memory - the physical journal device may
 442                  * hotswapped, and it breaks the `ro-after' testing code.
 443                  */
 444                 sync_blockdev(sbi->journal_bdev);
 445                 invalidate_bdev(sbi->journal_bdev);
 446                 ext3_blkdev_remove(sbi);
 447         }
 448         sb->s_fs_info = NULL;
 449         kfree(sbi->s_blockgroup_lock);
 450         kfree(sbi);
 451
 452         unlock_kernel();
 453 }
 454
 455 static struct kmem_cache *ext3_inode_cachep;
 456
 457 /*
 458  * Called inside transaction, so use GFP_NOFS
 459  */
 460 static struct inode *ext3_alloc_inode(struct super_block *sb)
 461 {
 462         struct ext3_inode_info *ei;
 463
 464         ei = kmem_cache_alloc(ext3_inode_cachep, GFP_NOFS);
 465         if (!ei)
 466                 return NULL;
 467         ei->i_block_alloc_info = NULL;
 468         ei->vfs_inode.i_version = 1;
 469         return &ei->vfs_inode;
 470 }
 471
 472 static void ext3_destroy_inode(struct inode *inode)
 473 {
 474         if (!list_empty(&(EXT3_I(inode)->i_orphan))) {
 475                 printk("EXT3 Inode %p: orphan list check failed!\n",
 476                         EXT3_I(inode));
 477                 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
 478                                 EXT3_I(inode), sizeof(struct ext3_inode_info),
 479                                 false);
 480                 dump_stack();
 481         }
 482         kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
 483 }
 484
 485 static void init_once(void *foo)
 486 {
 487         struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
 488
 489         INIT_LIST_HEAD(&ei->i_orphan);
 490 #ifdef CONFIG_EXT3_FS_XATTR
 491         init_rwsem(&ei->xattr_sem);
 492 #endif
 493         mutex_init(&ei->truncate_mutex);
 494         inode_init_once(&ei->vfs_inode);
 495 }
 496
 497 static int init_inodecache(void)
 498 {
 499         ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
 500                                              sizeof(struct ext3_inode_info),
 501                                              0, (SLAB_RECLAIM_ACCOUNT|
 502                                                 SLAB_MEM_SPREAD),
 503                                              init_once);
 504         if (ext3_inode_cachep == NULL)
 505                 return -ENOMEM;
 506         return 0;
 507 }
 508
 509 static void destroy_inodecache(void)
 510 {
 511         kmem_cache_destroy(ext3_inode_cachep);
 512 }
 513
 514 static void ext3_clear_inode(struct inode *inode)
 515 {
 516         struct ext3_block_alloc_info *rsv = EXT3_I(inode)->i_block_alloc_info;
 517         ext3_discard_reservation(inode);
 518         EXT3_I(inode)->i_block_alloc_info = NULL;
 519         if (unlikely(rsv))
 520                 kfree(rsv);
 521 }
 522
 523 static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
 524 {
 525 #if defined(CONFIG_QUOTA)
 526         struct ext3_sb_info *sbi = EXT3_SB(sb);
 527
 528         if (sbi->s_jquota_fmt)
 529                 seq_printf(seq, ",jqfmt=%s",
 530                 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0");
 531
 532         if (sbi->s_qf_names[USRQUOTA])
 533                 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
 534
 535         if (sbi->s_qf_names[GRPQUOTA])
 536                 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
 537
 538         if (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA)
 539                 seq_puts(seq, ",usrquota");
 540
 541         if (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)
 542                 seq_puts(seq, ",grpquota");
 543 #endif
 544 }
 545
 546 static char *data_mode_string(unsigned long mode)
 547 {
 548         switch (mode) {
 549         case EXT3_MOUNT_JOURNAL_DATA:
 550                 return "journal";
 551         case EXT3_MOUNT_ORDERED_DATA:
 552                 return "ordered";
 553         case EXT3_MOUNT_WRITEBACK_DATA:
 554                 return "writeback";
 555         }
 556         return "unknown";
 557 }
 558
 559 /*
 560  * Show an option if
 561  *  - it's set to a non-default value OR
 562  *  - if the per-sb default is different from the global default
 563  */
 564 static int ext3_show_options(struct seq_file *seq, struct vfsmount *vfs)
 565 {
 566         struct super_block *sb = vfs->mnt_sb;
 567         struct ext3_sb_info *sbi = EXT3_SB(sb);
 568         struct ext3_super_block *es = sbi->s_es;
 569         unsigned long def_mount_opts;
 570
 571         def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
 572
 573         if (sbi->s_sb_block != 1)
 574                 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
 575         if (test_opt(sb, MINIX_DF))
 576                 seq_puts(seq, ",minixdf");
 577         if (test_opt(sb, GRPID))
 578                 seq_puts(seq, ",grpid");
 579         if (!test_opt(sb, GRPID) && (def_mount_opts & EXT3_DEFM_BSDGROUPS))
 580                 seq_puts(seq, ",nogrpid");
 581         if (sbi->s_resuid != EXT3_DEF_RESUID ||
 582             le16_to_cpu(es->s_def_resuid) != EXT3_DEF_RESUID) {
 583                 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
 584         }
 585         if (sbi->s_resgid != EXT3_DEF_RESGID ||
 586             le16_to_cpu(es->s_def_resgid) != EXT3_DEF_RESGID) {
 587                 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
 588         }
 589         if (test_opt(sb, ERRORS_RO)) {
 590                 int def_errors = le16_to_cpu(es->s_errors);
 591
 592                 if (def_errors == EXT3_ERRORS_PANIC ||
 593                     def_errors == EXT3_ERRORS_CONTINUE) {
 594                         seq_puts(seq, ",errors=remount-ro");
 595                 }
 596         }
 597         if (test_opt(sb, ERRORS_CONT))
 598                 seq_puts(seq, ",errors=continue");
 599         if (test_opt(sb, ERRORS_PANIC))
 600                 seq_puts(seq, ",errors=panic");
 601         if (test_opt(sb, NO_UID32))
 602                 seq_puts(seq, ",nouid32");
 603         if (test_opt(sb, DEBUG))
 604                 seq_puts(seq, ",debug");
 605         if (test_opt(sb, OLDALLOC))
 606                 seq_puts(seq, ",oldalloc");
 607 #ifdef CONFIG_EXT3_FS_XATTR
 608         if (test_opt(sb, XATTR_USER))
 609                 seq_puts(seq, ",user_xattr");
 610         if (!test_opt(sb, XATTR_USER) &&
 611             (def_mount_opts & EXT3_DEFM_XATTR_USER)) {
 612                 seq_puts(seq, ",nouser_xattr");
 613         }
 614 #endif
 615 #ifdef CONFIG_EXT3_FS_POSIX_ACL
 616         if (test_opt(sb, POSIX_ACL))
 617                 seq_puts(seq, ",acl");
 618         if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT3_DEFM_ACL))
 619                 seq_puts(seq, ",noacl");
 620 #endif
 621         if (!test_opt(sb, RESERVATION))
 622                 seq_puts(seq, ",noreservation");
 623         if (sbi->s_commit_interval) {
 624                 seq_printf(seq, ",commit=%u",
 625                            (unsigned) (sbi->s_commit_interval / HZ));
 626         }
 627         if (test_opt(sb, BARRIER))
 628                 seq_puts(seq, ",barrier=1");
 629         if (test_opt(sb, NOBH))
 630                 seq_puts(seq, ",nobh");
 631
 632         seq_printf(seq, ",data=%s", data_mode_string(sbi->s_mount_opt &
 633                                                      EXT3_MOUNT_DATA_FLAGS));
 634         if (test_opt(sb, DATA_ERR_ABORT))
 635                 seq_puts(seq, ",data_err=abort");
 636
 637         ext3_show_quota_options(seq, sb);
 638
 639         return 0;
 640 }
 641
 642
 643 static struct inode *ext3_nfs_get_inode(struct super_block *sb,
 644                 u64 ino, u32 generation)
 645 {
 646         struct inode *inode;
 647
 648         if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO)
 649                 return ERR_PTR(-ESTALE);
 650         if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count))
 651                 return ERR_PTR(-ESTALE);
 652
 653         /* iget isn't really right if the inode is currently unallocated!!
 654          *
 655          * ext3_read_inode will return a bad_inode if the inode had been
 656          * deleted, so we should be safe.
 657          *
 658          * Currently we don't know the generation for parent directory, so
 659          * a generation of 0 means "accept any"
 660          */
 661         inode = ext3_iget(sb, ino);
 662         if (IS_ERR(inode))
 663                 return ERR_CAST(inode);
 664         if (generation && inode->i_generation != generation) {
 665                 iput(inode);
 666                 return ERR_PTR(-ESTALE);
 667         }
 668
 669         return inode;
 670 }
 671
 672 static struct dentry *ext3_fh_to_dentry(struct super_block *sb, struct fid *fid,
 673                 int fh_len, int fh_type)
 674 {
 675         return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
 676                                     ext3_nfs_get_inode);
 677 }
 678
 679 static struct dentry *ext3_fh_to_parent(struct super_block *sb, struct fid *fid,
 680                 int fh_len, int fh_type)
 681 {
 682         return generic_fh_to_parent(sb, fid, fh_len, fh_type,
 683                                     ext3_nfs_get_inode);
 684 }
 685
 686 /*
 687  * Try to release metadata pages (indirect blocks, directories) which are
 688  * mapped via the block device.  Since these pages could have journal heads
 689  * which would prevent try_to_free_buffers() from freeing them, we must use
 690  * jbd layer's try_to_free_buffers() function to release them.
 691  */
 692 static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
 693                                  gfp_t wait)
 694 {
 695         journal_t *journal = EXT3_SB(sb)->s_journal;
 696
 697         WARN_ON(PageChecked(page));
 698         if (!page_has_buffers(page))
 699                 return 0;
 700         if (journal)
 701                 return journal_try_to_free_buffers(journal, page,
 702                                                    wait & ~__GFP_WAIT);
 703         return try_to_free_buffers(page);
 704 }
 705
 706 #ifdef CONFIG_QUOTA
 707 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
 708 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
 709
 710 static int ext3_write_dquot(struct dquot *dquot);
 711 static int ext3_acquire_dquot(struct dquot *dquot);
 712 static int ext3_release_dquot(struct dquot *dquot);
 713 static int ext3_mark_dquot_dirty(struct dquot *dquot);
 714 static int ext3_write_info(struct super_block *sb, int type);
 715 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
 716                                 char *path, int remount);
 717 static int ext3_quota_on_mount(struct super_block *sb, int type);
 718 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
 719                                size_t len, loff_t off);
 720 static ssize_t ext3_quota_write(struct super_block *sb, int type,
 721                                 const char *data, size_t len, loff_t off);
 722
 723 static struct dquot_operations ext3_quota_operations = {
 724         .initialize     = dquot_initialize,
 725         .drop           = dquot_drop,
 726         .alloc_space    = dquot_alloc_space,
 727         .alloc_inode    = dquot_alloc_inode,
 728         .free_space     = dquot_free_space,
 729         .free_inode     = dquot_free_inode,
 730         .transfer       = dquot_transfer,
 731         .write_dquot    = ext3_write_dquot,
 732         .acquire_dquot  = ext3_acquire_dquot,
 733         .release_dquot  = ext3_release_dquot,
 734         .mark_dirty     = ext3_mark_dquot_dirty,
 735         .write_info     = ext3_write_info,
 736         .alloc_dquot    = dquot_alloc,
 737         .destroy_dquot  = dquot_destroy,
 738 };
 739
 740 static struct quotactl_ops ext3_qctl_operations = {
 741         .quota_on       = ext3_quota_on,
 742         .quota_off      = vfs_quota_off,
 743         .quota_sync     = vfs_quota_sync,
 744         .get_info       = vfs_get_dqinfo,
 745         .set_info       = vfs_set_dqinfo,
 746         .get_dqblk      = vfs_get_dqblk,
 747         .set_dqblk      = vfs_set_dqblk
 748 };
 749 #endif
 750
 751 static const struct super_operations ext3_sops = {
 752         .alloc_inode    = ext3_alloc_inode,
 753         .destroy_inode  = ext3_destroy_inode,
 754         .write_inode    = ext3_write_inode,
 755         .dirty_inode    = ext3_dirty_inode,
 756         .delete_inode   = ext3_delete_inode,
 757         .put_super      = ext3_put_super,
 758         .sync_fs        = ext3_sync_fs,
 759         .freeze_fs      = ext3_freeze,
 760         .unfreeze_fs    = ext3_unfreeze,
 761         .statfs         = ext3_statfs,
 762         .remount_fs     = ext3_remount,
 763         .clear_inode    = ext3_clear_inode,
 764         .show_options   = ext3_show_options,
 765 #ifdef CONFIG_QUOTA
 766         .quota_read     = ext3_quota_read,
 767         .quota_write    = ext3_quota_write,
 768 #endif
 769         .bdev_try_to_free_page = bdev_try_to_free_page,
 770 };
 771
 772 static const struct export_operations ext3_export_ops = {
 773         .fh_to_dentry = ext3_fh_to_dentry,
 774         .fh_to_parent = ext3_fh_to_parent,
 775         .get_parent = ext3_get_parent,
 776 };
 777
 778 enum {
 779         Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
 780         Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
 781         Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
 782         Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
 783         Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
 784         Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
 785         Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
 786         Opt_data_err_abort, Opt_data_err_ignore,
 787         Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
 788         Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
 789         Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
 790         Opt_grpquota
 791 };
 792
 793 static const match_table_t tokens = {
 794         {Opt_bsd_df, "bsddf"},
 795         {Opt_minix_df, "minixdf"},
 796         {Opt_grpid, "grpid"},
 797         {Opt_grpid, "bsdgroups"},
 798         {Opt_nogrpid, "nogrpid"},
 799         {Opt_nogrpid, "sysvgroups"},
 800         {Opt_resgid, "resgid=%u"},
 801         {Opt_resuid, "resuid=%u"},
 802         {Opt_sb, "sb=%u"},
 803         {Opt_err_cont, "errors=continue"},
 804         {Opt_err_panic, "errors=panic"},
 805         {Opt_err_ro, "errors=remount-ro"},
 806         {Opt_nouid32, "nouid32"},
 807         {Opt_nocheck, "nocheck"},
 808         {Opt_nocheck, "check=none"},
 809         {Opt_debug, "debug"},
 810         {Opt_oldalloc, "oldalloc"},
 811         {Opt_orlov, "orlov"},
 812         {Opt_user_xattr, "user_xattr"},
 813         {Opt_nouser_xattr, "nouser_xattr"},
 814         {Opt_acl, "acl"},
 815         {Opt_noacl, "noacl"},
 816         {Opt_reservation, "reservation"},
 817         {Opt_noreservation, "noreservation"},
 818         {Opt_noload, "noload"},
 819         {Opt_nobh, "nobh"},
 820         {Opt_bh, "bh"},
 821         {Opt_commit, "commit=%u"},
 822         {Opt_journal_update, "journal=update"},
 823         {Opt_journal_inum, "journal=%u"},
 824         {Opt_journal_dev, "journal_dev=%u"},
 825         {Opt_abort, "abort"},
 826         {Opt_data_journal, "data=journal"},
 827         {Opt_data_ordered, "data=ordered"},
 828         {Opt_data_writeback, "data=writeback"},
 829         {Opt_data_err_abort, "data_err=abort"},
 830         {Opt_data_err_ignore, "data_err=ignore"},
 831         {Opt_offusrjquota, "usrjquota="},
 832         {Opt_usrjquota, "usrjquota=%s"},
 833         {Opt_offgrpjquota, "grpjquota="},
 834         {Opt_grpjquota, "grpjquota=%s"},
 835         {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
 836         {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
 837         {Opt_grpquota, "grpquota"},
 838         {Opt_noquota, "noquota"},
 839         {Opt_quota, "quota"},
 840         {Opt_usrquota, "usrquota"},
 841         {Opt_barrier, "barrier=%u"},
 842         {Opt_resize, "resize"},
 843         {Opt_err, NULL},
 844 };
 845
 846 static ext3_fsblk_t get_sb_block(void **data)
 847 {
 848         ext3_fsblk_t    sb_block;
 849         char            *options = (char *) *data;
 850
 851         if (!options || strncmp(options, "sb=", 3) != 0)
 852                 return 1;       /* Default location */
 853         options += 3;
 854         /*todo: use simple_strtoll with >32bit ext3 */
 855         sb_block = simple_strtoul(options, &options, 0);
 856         if (*options && *options != ',') {
 857                 printk("EXT3-fs: Invalid sb specification: %s\n",
 858                        (char *) *data);
 859                 return 1;
 860         }
 861         if (*options == ',')
 862                 options++;
 863         *data = (void *) options;
 864         return sb_block;
 865 }
 866
 867 static int parse_options (char *options, struct super_block *sb,
 868                           unsigned int *inum, unsigned long *journal_devnum,
 869                           ext3_fsblk_t *n_blocks_count, int is_remount)
 870 {
 871         struct ext3_sb_info *sbi = EXT3_SB(sb);
 872         char * p;
 873         substring_t args[MAX_OPT_ARGS];
 874         int data_opt = 0;
 875         int option;
 876 #ifdef CONFIG_QUOTA
 877         int qtype, qfmt;
 878         char *qname;
 879 #endif
 880
 881         if (!options)
 882                 return 1;
 883
 884         while ((p = strsep (&options, ",")) != NULL) {
 885                 int token;
 886                 if (!*p)
 887                         continue;
 888
 889                 token = match_token(p, tokens, args);
 890                 switch (token) {
 891                 case Opt_bsd_df:
 892                         clear_opt (sbi->s_mount_opt, MINIX_DF);
 893                         break;
 894                 case Opt_minix_df:
 895                         set_opt (sbi->s_mount_opt, MINIX_DF);
 896                         break;
 897                 case Opt_grpid:
 898                         set_opt (sbi->s_mount_opt, GRPID);
 899                         break;
 900                 case Opt_nogrpid:
 901                         clear_opt (sbi->s_mount_opt, GRPID);
 902                         break;
 903                 case Opt_resuid:
 904                         if (match_int(&args[0], &option))
 905                                 return 0;
 906                         sbi->s_resuid = option;
 907                         break;
 908                 case Opt_resgid:
 909                         if (match_int(&args[0], &option))
 910                                 return 0;
 911                         sbi->s_resgid = option;
 912                         break;
 913                 case Opt_sb:
 914                         /* handled by get_sb_block() instead of here */
 915                         /* *sb_block = match_int(&args[0]); */
 916                         break;
 917                 case Opt_err_panic:
 918                         clear_opt (sbi->s_mount_opt, ERRORS_CONT);
 919                         clear_opt (sbi->s_mount_opt, ERRORS_RO);
 920                         set_opt (sbi->s_mount_opt, ERRORS_PANIC);
 921                         break;
 922                 case Opt_err_ro:
 923                         clear_opt (sbi->s_mount_opt, ERRORS_CONT);
 924                         clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
 925                         set_opt (sbi->s_mount_opt, ERRORS_RO);
 926                         break;
 927                 case Opt_err_cont:
 928                         clear_opt (sbi->s_mount_opt, ERRORS_RO);
 929                         clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
 930                         set_opt (sbi->s_mount_opt, ERRORS_CONT);
 931                         break;
 932                 case Opt_nouid32:
 933                         set_opt (sbi->s_mount_opt, NO_UID32);
 934                         break;
 935                 case Opt_nocheck:
 936                         clear_opt (sbi->s_mount_opt, CHECK);
 937                         break;
 938                 case Opt_debug:
 939                         set_opt (sbi->s_mount_opt, DEBUG);
 940                         break;
 941                 case Opt_oldalloc:
 942                         set_opt (sbi->s_mount_opt, OLDALLOC);
 943                         break;
 944                 case Opt_orlov:
 945                         clear_opt (sbi->s_mount_opt, OLDALLOC);
 946                         break;
 947 #ifdef CONFIG_EXT3_FS_XATTR
 948                 case Opt_user_xattr:
 949                         set_opt (sbi->s_mount_opt, XATTR_USER);
 950                         break;
 951                 case Opt_nouser_xattr:
 952                         clear_opt (sbi->s_mount_opt, XATTR_USER);
 953                         break;
 954 #else
 955                 case Opt_user_xattr:
 956                 case Opt_nouser_xattr:
 957                         printk("EXT3 (no)user_xattr options not supported\n");
 958                         break;
 959 #endif
 960 #ifdef CONFIG_EXT3_FS_POSIX_ACL
 961                 case Opt_acl:
 962                         set_opt(sbi->s_mount_opt, POSIX_ACL);
 963                         break;
 964                 case Opt_noacl:
 965                         clear_opt(sbi->s_mount_opt, POSIX_ACL);
 966                         break;
 967 #else
 968                 case Opt_acl:
 969                 case Opt_noacl:
 970                         printk("EXT3 (no)acl options not supported\n");
 971                         break;
 972 #endif
 973                 case Opt_reservation:
 974                         set_opt(sbi->s_mount_opt, RESERVATION);
 975                         break;
 976                 case Opt_noreservation:
 977                         clear_opt(sbi->s_mount_opt, RESERVATION);
 978                         break;
 979                 case Opt_journal_update:
 980                         /* @@@ FIXME */
 981                         /* Eventually we will want to be able to create
 982                            a journal file here.  For now, only allow the
 983                            user to specify an existing inode to be the
 984                            journal file. */
 985                         if (is_remount) {
 986                                 printk(KERN_ERR "EXT3-fs: cannot specify "
 987                                        "journal on remount\n");
 988                                 return 0;
 989                         }
 990                         set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
 991                         break;
 992                 case Opt_journal_inum:
 993                         if (is_remount) {
 994                                 printk(KERN_ERR "EXT3-fs: cannot specify "
 995                                        "journal on remount\n");
 996                                 return 0;
 997                         }
 998                         if (match_int(&args[0], &option))
 999                                 return 0;
1000                         *inum = option;
1001                         break;
1002                 case Opt_journal_dev:
1003                         if (is_remount) {
1004                                 printk(KERN_ERR "EXT3-fs: cannot specify "
1005                                        "journal on remount\n");
1006                                 return 0;
1007                         }
1008                         if (match_int(&args[0], &option))
1009                                 return 0;
1010                         *journal_devnum = option;
1011                         break;
1012                 case Opt_noload:
1013                         set_opt (sbi->s_mount_opt, NOLOAD);
1014                         break;
1015                 case Opt_commit:
1016                         if (match_int(&args[0], &option))
1017                                 return 0;
1018                         if (option < 0)
1019                                 return 0;
1020                         if (option == 0)
1021                                 option = JBD_DEFAULT_MAX_COMMIT_AGE;
1022                         sbi->s_commit_interval = HZ * option;
1023                         break;
1024                 case Opt_data_journal:
1025                         data_opt = EXT3_MOUNT_JOURNAL_DATA;
1026                         goto datacheck;
1027                 case Opt_data_ordered:
1028                         data_opt = EXT3_MOUNT_ORDERED_DATA;
1029                         goto datacheck;
1030                 case Opt_data_writeback:
1031                         data_opt = EXT3_MOUNT_WRITEBACK_DATA;
1032                 datacheck:
1033                         if (is_remount) {
1034                                 if ((sbi->s_mount_opt & EXT3_MOUNT_DATA_FLAGS)
1035                                                 == data_opt)
1036                                         break;
1037                                 printk(KERN_ERR
1038                                         "EXT3-fs (device %s): Cannot change "
1039                                         "data mode on remount. The filesystem "
1040                                         "is mounted in data=%s mode and you "
1041                                         "try to remount it in data=%s mode.\n",
1042                                         sb->s_id,
1043                                         data_mode_string(sbi->s_mount_opt &
1044                                                         EXT3_MOUNT_DATA_FLAGS),
1045                                         data_mode_string(data_opt));
1046                                 return 0;
1047                         } else {
1048                                 sbi->s_mount_opt &= ~EXT3_MOUNT_DATA_FLAGS;
1049                                 sbi->s_mount_opt |= data_opt;
1050                         }
1051                         break;
1052                 case Opt_data_err_abort:
1053                         set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1054                         break;
1055                 case Opt_data_err_ignore:
1056                         clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1057                         break;
1058 #ifdef CONFIG_QUOTA
1059                 case Opt_usrjquota:
1060                         qtype = USRQUOTA;
1061                         goto set_qf_name;
1062                 case Opt_grpjquota:
1063                         qtype = GRPQUOTA;
1064 set_qf_name:
1065                         if (sb_any_quota_loaded(sb) &&
1066                             !sbi->s_qf_names[qtype]) {
1067                                 printk(KERN_ERR
1068                                         "EXT3-fs: Cannot change journaled "
1069                                         "quota options when quota turned on.\n");
1070                                 return 0;
1071                         }
1072                         qname = match_strdup(&args[0]);
1073                         if (!qname) {
1074                                 printk(KERN_ERR
1075                                         "EXT3-fs: not enough memory for "
1076                                         "storing quotafile name.\n");
1077                                 return 0;
1078                         }
1079                         if (sbi->s_qf_names[qtype] &&
1080                             strcmp(sbi->s_qf_names[qtype], qname)) {
1081                                 printk(KERN_ERR
1082                                         "EXT3-fs: %s quota file already "
1083                                         "specified.\n", QTYPE2NAME(qtype));
1084                                 kfree(qname);
1085                                 return 0;
1086                         }
1087                         sbi->s_qf_names[qtype] = qname;
1088                         if (strchr(sbi->s_qf_names[qtype], '/')) {
1089                                 printk(KERN_ERR
1090                                         "EXT3-fs: quotafile must be on "
1091                                         "filesystem root.\n");
1092                                 kfree(sbi->s_qf_names[qtype]);
1093                                 sbi->s_qf_names[qtype] = NULL;
1094                                 return 0;
1095                         }
1096                         set_opt(sbi->s_mount_opt, QUOTA);
1097                         break;
1098                 case Opt_offusrjquota:
1099                         qtype = USRQUOTA;
1100                         goto clear_qf_name;
1101                 case Opt_offgrpjquota:
1102                         qtype = GRPQUOTA;
1103 clear_qf_name:
1104                         if (sb_any_quota_loaded(sb) &&
1105                             sbi->s_qf_names[qtype]) {
1106                                 printk(KERN_ERR "EXT3-fs: Cannot change "
1107                                         "journaled quota options when "
1108                                         "quota turned on.\n");
1109                                 return 0;
1110                         }
1111                         /*
1112                          * The space will be released later when all options
1113                          * are confirmed to be correct
1114                          */
1115                         sbi->s_qf_names[qtype] = NULL;
1116                         break;
1117                 case Opt_jqfmt_vfsold:
1118                         qfmt = QFMT_VFS_OLD;
1119                         goto set_qf_format;
1120                 case Opt_jqfmt_vfsv0:
1121                         qfmt = QFMT_VFS_V0;
1122 set_qf_format:
1123                         if (sb_any_quota_loaded(sb) &&
1124                             sbi->s_jquota_fmt != qfmt) {
1125                                 printk(KERN_ERR "EXT3-fs: Cannot change "
1126                                         "journaled quota options when "
1127                                         "quota turned on.\n");
1128                                 return 0;
1129                         }
1130                         sbi->s_jquota_fmt = qfmt;
1131                         break;
1132                 case Opt_quota:
1133                 case Opt_usrquota:
1134                         set_opt(sbi->s_mount_opt, QUOTA);
1135                         set_opt(sbi->s_mount_opt, USRQUOTA);
1136                         break;
1137                 case Opt_grpquota:
1138                         set_opt(sbi->s_mount_opt, QUOTA);
1139                         set_opt(sbi->s_mount_opt, GRPQUOTA);
1140                         break;
1141                 case Opt_noquota:
1142                         if (sb_any_quota_loaded(sb)) {
1143                                 printk(KERN_ERR "EXT3-fs: Cannot change quota "
1144                                         "options when quota turned on.\n");
1145                                 return 0;
1146                         }
1147                         clear_opt(sbi->s_mount_opt, QUOTA);
1148                         clear_opt(sbi->s_mount_opt, USRQUOTA);
1149                         clear_opt(sbi->s_mount_opt, GRPQUOTA);
1150                         break;
1151 #else
1152                 case Opt_quota:
1153                 case Opt_usrquota:
1154                 case Opt_grpquota:
1155                         printk(KERN_ERR
1156                                 "EXT3-fs: quota options not supported.\n");
1157                         break;
1158                 case Opt_usrjquota:
1159                 case Opt_grpjquota:
1160                 case Opt_offusrjquota:
1161                 case Opt_offgrpjquota:
1162                 case Opt_jqfmt_vfsold:
1163                 case Opt_jqfmt_vfsv0:
1164                         printk(KERN_ERR
1165                                 "EXT3-fs: journaled quota options not "
1166                                 "supported.\n");
1167                         break;
1168                 case Opt_noquota:
1169                         break;
1170 #endif
1171                 case Opt_abort:
1172                         set_opt(sbi->s_mount_opt, ABORT);
1173                         break;
1174                 case Opt_barrier:
1175                         if (match_int(&args[0], &option))
1176                                 return 0;
1177                         if (option)
1178                                 set_opt(sbi->s_mount_opt, BARRIER);
1179                         else
1180                                 clear_opt(sbi->s_mount_opt, BARRIER);
1181                         break;
1182                 case Opt_ignore:
1183                         break;
1184                 case Opt_resize:
1185                         if (!is_remount) {
1186                                 printk("EXT3-fs: resize option only available "
1187                                         "for remount\n");
1188                                 return 0;
1189                         }
1190                         if (match_int(&args[0], &option) != 0)
1191                                 return 0;
1192                         *n_blocks_count = option;
1193                         break;
1194                 case Opt_nobh:
1195                         set_opt(sbi->s_mount_opt, NOBH);
1196                         break;
1197                 case Opt_bh:
1198                         clear_opt(sbi->s_mount_opt, NOBH);
1199                         break;
1200                 default:
1201                         printk (KERN_ERR
1202                                 "EXT3-fs: Unrecognized mount option \"%s\" "
1203                                 "or missing value\n", p);
1204                         return 0;
1205                 }
1206         }
1207 #ifdef CONFIG_QUOTA
1208         if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1209                 if ((sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA) &&
1210                      sbi->s_qf_names[USRQUOTA])
1211                         clear_opt(sbi->s_mount_opt, USRQUOTA);
1212
1213                 if ((sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA) &&
1214                      sbi->s_qf_names[GRPQUOTA])
1215                         clear_opt(sbi->s_mount_opt, GRPQUOTA);
1216
1217                 if ((sbi->s_qf_names[USRQUOTA] &&
1218                                 (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)) ||
1219                     (sbi->s_qf_names[GRPQUOTA] &&
1220                                 (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA))) {
1221                         printk(KERN_ERR "EXT3-fs: old and new quota "
1222                                         "format mixing.\n");
1223                         return 0;
1224                 }
1225
1226                 if (!sbi->s_jquota_fmt) {
1227                         printk(KERN_ERR "EXT3-fs: journaled quota format "
1228                                         "not specified.\n");
1229                         return 0;
1230                 }
1231         } else {
1232                 if (sbi->s_jquota_fmt) {
1233                         printk(KERN_ERR "EXT3-fs: journaled quota format "
1234                                         "specified with no journaling "
1235                                         "enabled.\n");
1236                         return 0;
1237                 }
1238         }
1239 #endif
1240         return 1;
1241 }
1242
1243 static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1244                             int read_only)
1245 {
1246         struct ext3_sb_info *sbi = EXT3_SB(sb);
1247         int res = 0;
1248
1249         if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
1250                 printk (KERN_ERR "EXT3-fs warning: revision level too high, "
1251                         "forcing read-only mode\n");
1252                 res = MS_RDONLY;
1253         }
1254         if (read_only)
1255                 return res;
1256         if (!(sbi->s_mount_state & EXT3_VALID_FS))
1257                 printk (KERN_WARNING "EXT3-fs warning: mounting unchecked fs, "
1258                         "running e2fsck is recommended\n");
1259         else if ((sbi->s_mount_state & EXT3_ERROR_FS))
1260                 printk (KERN_WARNING
1261                         "EXT3-fs warning: mounting fs with errors, "
1262                         "running e2fsck is recommended\n");
1263         else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1264                  le16_to_cpu(es->s_mnt_count) >=
1265                  (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1266                 printk (KERN_WARNING
1267                         "EXT3-fs warning: maximal mount count reached, "
1268                         "running e2fsck is recommended\n");
1269         else if (le32_to_cpu(es->s_checkinterval) &&
1270                 (le32_to_cpu(es->s_lastcheck) +
1271                         le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1272                 printk (KERN_WARNING
1273                         "EXT3-fs warning: checktime reached, "
1274                         "running e2fsck is recommended\n");
1275 #if 0
1276                 /* @@@ We _will_ want to clear the valid bit if we find
1277                    inconsistencies, to force a fsck at reboot.  But for
1278                    a plain journaled filesystem we can keep it set as
1279                    valid forever! :) */
1280         es->s_state &= cpu_to_le16(~EXT3_VALID_FS);
1281 #endif
1282         if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1283                 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
1284         le16_add_cpu(&es->s_mnt_count, 1);
1285         es->s_mtime = cpu_to_le32(get_seconds());
1286         ext3_update_dynamic_rev(sb);
1287         EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1288
1289         ext3_commit_super(sb, es, 1);
1290         if (test_opt(sb, DEBUG))
1291                 printk(KERN_INFO "[EXT3 FS bs=%lu, gc=%lu, "
1292                                 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1293                         sb->s_blocksize,
1294                         sbi->s_groups_count,
1295                         EXT3_BLOCKS_PER_GROUP(sb),
1296                         EXT3_INODES_PER_GROUP(sb),
1297                         sbi->s_mount_opt);
1298
1299         printk(KERN_INFO "EXT3 FS on %s, ", sb->s_id);
1300         if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1301                 char b[BDEVNAME_SIZE];
1302
1303                 printk("external journal on %s\n",
1304                         bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1305         } else {
1306                 printk("internal journal\n");
1307         }
1308         return res;
1309 }
1310
1311 /* Called at mount-time, super-block is locked */
1312 static int ext3_check_descriptors(struct super_block *sb)
1313 {
1314         struct ext3_sb_info *sbi = EXT3_SB(sb);
1315         int i;
1316
1317         ext3_debug ("Checking group descriptors");
1318
1319         for (i = 0; i < sbi->s_groups_count; i++) {
1320                 struct ext3_group_desc *gdp = ext3_get_group_desc(sb, i, NULL);
1321                 ext3_fsblk_t first_block = ext3_group_first_block_no(sb, i);
1322                 ext3_fsblk_t last_block;
1323
1324                 if (i == sbi->s_groups_count - 1)
1325                         last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
1326                 else
1327                         last_block = first_block +
1328                                 (EXT3_BLOCKS_PER_GROUP(sb) - 1);
1329
1330                 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
1331                     le32_to_cpu(gdp->bg_block_bitmap) > last_block)
1332                 {
1333                         ext3_error (sb, "ext3_check_descriptors",
1334                                     "Block bitmap for group %d"
1335                                     " not in group (block %lu)!",
1336                                     i, (unsigned long)
1337                                         le32_to_cpu(gdp->bg_block_bitmap));
1338                         return 0;
1339                 }
1340                 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
1341                     le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
1342                 {
1343                         ext3_error (sb, "ext3_check_descriptors",
1344                                     "Inode bitmap for group %d"
1345                                     " not in group (block %lu)!",
1346                                     i, (unsigned long)
1347                                         le32_to_cpu(gdp->bg_inode_bitmap));
1348                         return 0;
1349                 }
1350                 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
1351                     le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
1352                     last_block)
1353                 {
1354                         ext3_error (sb, "ext3_check_descriptors",
1355                                     "Inode table for group %d"
1356                                     " not in group (block %lu)!",
1357                                     i, (unsigned long)
1358                                         le32_to_cpu(gdp->bg_inode_table));
1359                         return 0;
1360                 }
1361         }
1362
1363         sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1364         sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1365         return 1;
1366 }
1367
1368
1369 /* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1370  * the superblock) which were deleted from all directories, but held open by
1371  * a process at the time of a crash.  We walk the list and try to delete these
1372  * inodes at recovery time (only with a read-write filesystem).
1373  *
1374  * In order to keep the orphan inode chain consistent during traversal (in
1375  * case of crash during recovery), we link each inode into the superblock
1376  * orphan list_head and handle it the same way as an inode deletion during
1377  * normal operation (which journals the operations for us).
1378  *
1379  * We only do an iget() and an iput() on each inode, which is very safe if we
1380  * accidentally point at an in-use or already deleted inode.  The worst that
1381  * can happen in this case is that we get a "bit already cleared" message from
1382  * ext3_free_inode().  The only reason we would point at a wrong inode is if
1383  * e2fsck was run on this filesystem, and it must have already done the orphan
1384  * inode cleanup for us, so we can safely abort without any further action.
1385  */
1386 static void ext3_orphan_cleanup (struct super_block * sb,
1387                                  struct ext3_super_block * es)
1388 {
1389         unsigned int s_flags = sb->s_flags;
1390         int nr_orphans = 0, nr_truncates = 0;
1391 #ifdef CONFIG_QUOTA
1392         int i;
1393 #endif
1394         if (!es->s_last_orphan) {
1395                 jbd_debug(4, "no orphan inodes to clean up\n");
1396                 return;
1397         }
1398
1399         if (bdev_read_only(sb->s_bdev)) {
1400                 printk(KERN_ERR "EXT3-fs: write access "
1401                         "unavailable, skipping orphan cleanup.\n");
1402                 return;
1403         }
1404
1405         if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1406                 if (es->s_last_orphan)
1407                         jbd_debug(1, "Errors on filesystem, "
1408                                   "clearing orphan list.\n");
1409                 es->s_last_orphan = 0;
1410                 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1411                 return;
1412         }
1413
1414         if (s_flags & MS_RDONLY) {
1415                 printk(KERN_INFO "EXT3-fs: %s: orphan cleanup on readonly fs\n",
1416                        sb->s_id);
1417                 sb->s_flags &= ~MS_RDONLY;
1418         }
1419 #ifdef CONFIG_QUOTA
1420         /* Needed for iput() to work correctly and not trash data */
1421         sb->s_flags |= MS_ACTIVE;
1422         /* Turn on quotas so that they are updated correctly */
1423         for (i = 0; i < MAXQUOTAS; i++) {
1424                 if (EXT3_SB(sb)->s_qf_names[i]) {
1425                         int ret = ext3_quota_on_mount(sb, i);
1426                         if (ret < 0)
1427                                 printk(KERN_ERR
1428                                         "EXT3-fs: Cannot turn on journaled "
1429                                         "quota: error %d\n", ret);
1430                 }
1431         }
1432 #endif
1433
1434         while (es->s_last_orphan) {
1435                 struct inode *inode;
1436
1437                 inode = ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1438                 if (IS_ERR(inode)) {
1439                         es->s_last_orphan = 0;
1440                         break;
1441                 }
1442
1443                 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1444                 vfs_dq_init(inode);
1445                 if (inode->i_nlink) {
1446                         printk(KERN_DEBUG
1447                                 "%s: truncating inode %lu to %Ld bytes\n",
1448                                 __func__, inode->i_ino, inode->i_size);
1449                         jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1450                                   inode->i_ino, inode->i_size);
1451                         ext3_truncate(inode);
1452                         nr_truncates++;
1453                 } else {
1454                         printk(KERN_DEBUG
1455                                 "%s: deleting unreferenced inode %lu\n",
1456                                 __func__, inode->i_ino);
1457                         jbd_debug(2, "deleting unreferenced inode %lu\n",
1458                                   inode->i_ino);
1459                         nr_orphans++;
1460                 }
1461                 iput(inode);  /* The delete magic happens here! */
1462         }
1463
1464 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1465
1466         if (nr_orphans)
1467                 printk(KERN_INFO "EXT3-fs: %s: %d orphan inode%s deleted\n",
1468                        sb->s_id, PLURAL(nr_orphans));
1469         if (nr_truncates)
1470                 printk(KERN_INFO "EXT3-fs: %s: %d truncate%s cleaned up\n",
1471                        sb->s_id, PLURAL(nr_truncates));
1472 #ifdef CONFIG_QUOTA
1473         /* Turn quotas off */
1474         for (i = 0; i < MAXQUOTAS; i++) {
1475                 if (sb_dqopt(sb)->files[i])
1476                         vfs_quota_off(sb, i, 0);
1477         }
1478 #endif
1479         sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1480 }
1481
1482 /*
1483  * Maximal file size.  There is a direct, and {,double-,triple-}indirect
1484  * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1485  * We need to be 1 filesystem block less than the 2^32 sector limit.
1486  */
1487 static loff_t ext3_max_size(int bits)
1488 {
1489         loff_t res = EXT3_NDIR_BLOCKS;
1490         int meta_blocks;
1491         loff_t upper_limit;
1492
1493         /* This is calculated to be the largest file size for a
1494          * dense, file such that the total number of
1495          * sectors in the file, including data and all indirect blocks,
1496          * does not exceed 2^32 -1
1497          * __u32 i_blocks representing the total number of
1498          * 512 bytes blocks of the file
1499          */
1500         upper_limit = (1LL << 32) - 1;
1501
1502         /* total blocks in file system block size */
1503         upper_limit >>= (bits - 9);
1504
1505
1506         /* indirect blocks */
1507         meta_blocks = 1;
1508         /* double indirect blocks */
1509         meta_blocks += 1 + (1LL << (bits-2));
1510         /* tripple indirect blocks */
1511         meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1512
1513         upper_limit -= meta_blocks;
1514         upper_limit <<= bits;
1515
1516         res += 1LL << (bits-2);
1517         res += 1LL << (2*(bits-2));
1518         res += 1LL << (3*(bits-2));
1519         res <<= bits;
1520         if (res > upper_limit)
1521                 res = upper_limit;
1522
1523         if (res > MAX_LFS_FILESIZE)
1524                 res = MAX_LFS_FILESIZE;
1525
1526         return res;
1527 }
1528
1529 static ext3_fsblk_t descriptor_loc(struct super_block *sb,
1530                                     ext3_fsblk_t logic_sb_block,
1531                                     int nr)
1532 {
1533         struct ext3_sb_info *sbi = EXT3_SB(sb);
1534         unsigned long bg, first_meta_bg;
1535         int has_super = 0;
1536
1537         first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1538
1539         if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1540             nr < first_meta_bg)
1541                 return (logic_sb_block + nr + 1);
1542         bg = sbi->s_desc_per_block * nr;
1543         if (ext3_bg_has_super(sb, bg))
1544                 has_super = 1;
1545         return (has_super + ext3_group_first_block_no(sb, bg));
1546 }
1547
1548
1549 static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1550 {
1551         struct buffer_head * bh;
1552         struct ext3_super_block *es = NULL;
1553         struct ext3_sb_info *sbi;
1554         ext3_fsblk_t block;
1555         ext3_fsblk_t sb_block = get_sb_block(&data);
1556         ext3_fsblk_t logic_sb_block;
1557         unsigned long offset = 0;
1558         unsigned int journal_inum = 0;
1559         unsigned long journal_devnum = 0;
1560         unsigned long def_mount_opts;
1561         struct inode *root;
1562         int blocksize;
1563         int hblock;
1564         int db_count;
1565         int i;
1566         int needs_recovery;
1567         int ret = -EINVAL;
1568         __le32 features;
1569         int err;
1570
1571         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1572         if (!sbi)
1573                 return -ENOMEM;
1574
1575         sbi->s_blockgroup_lock =
1576                 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
1577         if (!sbi->s_blockgroup_lock) {
1578                 kfree(sbi);
1579                 return -ENOMEM;
1580         }
1581         sb->s_fs_info = sbi;
1582         sbi->s_mount_opt = 0;
1583         sbi->s_resuid = EXT3_DEF_RESUID;
1584         sbi->s_resgid = EXT3_DEF_RESGID;
1585         sbi->s_sb_block = sb_block;
1586
1587         unlock_kernel();
1588
1589         blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1590         if (!blocksize) {
1591                 printk(KERN_ERR "EXT3-fs: unable to set blocksize\n");
1592                 goto out_fail;
1593         }
1594
1595         /*
1596          * The ext3 superblock will not be buffer aligned for other than 1kB
1597          * block sizes.  We need to calculate the offset from buffer start.
1598          */
1599         if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1600                 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1601                 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1602         } else {
1603                 logic_sb_block = sb_block;
1604         }
1605
1606         if (!(bh = sb_bread(sb, logic_sb_block))) {
1607                 printk (KERN_ERR "EXT3-fs: unable to read superblock\n");
1608                 goto out_fail;
1609         }
1610         /*
1611          * Note: s_es must be initialized as soon as possible because
1612          *       some ext3 macro-instructions depend on its value
1613          */
1614         es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1615         sbi->s_es = es;
1616         sb->s_magic = le16_to_cpu(es->s_magic);
1617         if (sb->s_magic != EXT3_SUPER_MAGIC)
1618                 goto cantfind_ext3;
1619
1620         /* Set defaults before we parse the mount options */
1621         def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1622         if (def_mount_opts & EXT3_DEFM_DEBUG)
1623                 set_opt(sbi->s_mount_opt, DEBUG);
1624         if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1625                 set_opt(sbi->s_mount_opt, GRPID);
1626         if (def_mount_opts & EXT3_DEFM_UID16)
1627                 set_opt(sbi->s_mount_opt, NO_UID32);
1628 #ifdef CONFIG_EXT3_FS_XATTR
1629         if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1630                 set_opt(sbi->s_mount_opt, XATTR_USER);
1631 #endif
1632 #ifdef CONFIG_EXT3_FS_POSIX_ACL
1633         if (def_mount_opts & EXT3_DEFM_ACL)
1634                 set_opt(sbi->s_mount_opt, POSIX_ACL);
1635 #endif
1636         if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1637                 sbi->s_mount_opt |= EXT3_MOUNT_JOURNAL_DATA;
1638         else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1639                 sbi->s_mount_opt |= EXT3_MOUNT_ORDERED_DATA;
1640         else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1641                 sbi->s_mount_opt |= EXT3_MOUNT_WRITEBACK_DATA;
1642
1643         if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1644                 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1645         else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_CONTINUE)
1646                 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1647         else
1648                 set_opt(sbi->s_mount_opt, ERRORS_RO);
1649
1650         sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1651         sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1652
1653         set_opt(sbi->s_mount_opt, RESERVATION);
1654
1655         if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1656                             NULL, 0))
1657                 goto failed_mount;
1658
1659         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1660                 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1661
1662         if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1663             (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1664              EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1665              EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1666                 printk(KERN_WARNING
1667                        "EXT3-fs warning: feature flags set on rev 0 fs, "
1668                        "running e2fsck is recommended\n");
1669         /*
1670          * Check feature flags regardless of the revision level, since we
1671          * previously didn't change the revision level when setting the flags,
1672          * so there is a chance incompat flags are set on a rev 0 filesystem.
1673          */
1674         features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1675         if (features) {
1676                 printk(KERN_ERR "EXT3-fs: %s: couldn't mount because of "
1677                        "unsupported optional features (%x).\n",
1678                        sb->s_id, le32_to_cpu(features));
1679                 goto failed_mount;
1680         }
1681         features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1682         if (!(sb->s_flags & MS_RDONLY) && features) {
1683                 printk(KERN_ERR "EXT3-fs: %s: couldn't mount RDWR because of "
1684                        "unsupported optional features (%x).\n",
1685                        sb->s_id, le32_to_cpu(features));
1686                 goto failed_mount;
1687         }
1688         blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1689
1690         if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1691             blocksize > EXT3_MAX_BLOCK_SIZE) {
1692                 printk(KERN_ERR
1693                        "EXT3-fs: Unsupported filesystem blocksize %d on %s.\n",
1694                        blocksize, sb->s_id);
1695                 goto failed_mount;
1696         }
1697
1698         hblock = bdev_logical_block_size(sb->s_bdev);
1699         if (sb->s_blocksize != blocksize) {
1700                 /*
1701                  * Make sure the blocksize for the filesystem is larger
1702                  * than the hardware sectorsize for the machine.
1703                  */
1704                 if (blocksize < hblock) {
1705                         printk(KERN_ERR "EXT3-fs: blocksize %d too small for "
1706                                "device blocksize %d.\n", blocksize, hblock);
1707                         goto failed_mount;
1708                 }
1709
1710                 brelse (bh);
1711                 if (!sb_set_blocksize(sb, blocksize)) {
1712                         printk(KERN_ERR "EXT3-fs: bad blocksize %d.\n",
1713                                 blocksize);
1714                         goto out_fail;
1715                 }
1716                 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1717                 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1718                 bh = sb_bread(sb, logic_sb_block);
1719                 if (!bh) {
1720                         printk(KERN_ERR
1721                                "EXT3-fs: Can't read superblock on 2nd try.\n");
1722                         goto failed_mount;
1723                 }
1724                 es = (struct ext3_super_block *)(((char *)bh->b_data) + offset);
1725                 sbi->s_es = es;
1726                 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
1727                         printk (KERN_ERR
1728                                 "EXT3-fs: Magic mismatch, very weird !\n");
1729                         goto failed_mount;
1730                 }
1731         }
1732
1733         sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1734
1735         if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1736                 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1737                 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1738         } else {
1739                 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1740                 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1741                 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
1742                     (!is_power_of_2(sbi->s_inode_size)) ||
1743                     (sbi->s_inode_size > blocksize)) {
1744                         printk (KERN_ERR
1745                                 "EXT3-fs: unsupported inode size: %d\n",
1746                                 sbi->s_inode_size);
1747                         goto failed_mount;
1748                 }
1749         }
1750         sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1751                                    le32_to_cpu(es->s_log_frag_size);
1752         if (blocksize != sbi->s_frag_size) {
1753                 printk(KERN_ERR
1754                        "EXT3-fs: fragsize %lu != blocksize %u (unsupported)\n",
1755                        sbi->s_frag_size, blocksize);
1756                 goto failed_mount;
1757         }
1758         sbi->s_frags_per_block = 1;
1759         sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1760         sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1761         sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1762         if (EXT3_INODE_SIZE(sb) == 0 || EXT3_INODES_PER_GROUP(sb) == 0)
1763                 goto cantfind_ext3;
1764         sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1765         if (sbi->s_inodes_per_block == 0)
1766                 goto cantfind_ext3;
1767         sbi->s_itb_per_group = sbi->s_inodes_per_group /
1768                                         sbi->s_inodes_per_block;
1769         sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1770         sbi->s_sbh = bh;
1771         sbi->s_mount_state = le16_to_cpu(es->s_state);
1772         sbi->s_addr_per_block_bits = ilog2(EXT3_ADDR_PER_BLOCK(sb));
1773         sbi->s_desc_per_block_bits = ilog2(EXT3_DESC_PER_BLOCK(sb));
1774         for (i=0; i < 4; i++)
1775                 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1776         sbi->s_def_hash_version = es->s_def_hash_version;
1777         i = le32_to_cpu(es->s_flags);
1778         if (i & EXT2_FLAGS_UNSIGNED_HASH)
1779                 sbi->s_hash_unsigned = 3;
1780         else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
1781 #ifdef __CHAR_UNSIGNED__
1782                 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
1783                 sbi->s_hash_unsigned = 3;
1784 #else
1785                 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
1786 #endif
1787         }
1788
1789         if (sbi->s_blocks_per_group > blocksize * 8) {
1790                 printk (KERN_ERR
1791                         "EXT3-fs: #blocks per group too big: %lu\n",
1792                         sbi->s_blocks_per_group);
1793                 goto failed_mount;
1794         }
1795         if (sbi->s_frags_per_group > blocksize * 8) {
1796                 printk (KERN_ERR
1797                         "EXT3-fs: #fragments per group too big: %lu\n",
1798                         sbi->s_frags_per_group);
1799                 goto failed_mount;
1800         }
1801         if (sbi->s_inodes_per_group > blocksize * 8) {
1802                 printk (KERN_ERR
1803                         "EXT3-fs: #inodes per group too big: %lu\n",
1804                         sbi->s_inodes_per_group);
1805                 goto failed_mount;
1806         }
1807
1808         if (le32_to_cpu(es->s_blocks_count) >
1809                     (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
1810                 printk(KERN_ERR "EXT3-fs: filesystem on %s:"
1811                         " too large to mount safely\n", sb->s_id);
1812                 if (sizeof(sector_t) < 8)
1813                         printk(KERN_WARNING "EXT3-fs: CONFIG_LBDAF not "
1814                                         "enabled\n");
1815                 goto failed_mount;
1816         }
1817
1818         if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1819                 goto cantfind_ext3;
1820         sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1821                                le32_to_cpu(es->s_first_data_block) - 1)
1822                                        / EXT3_BLOCKS_PER_GROUP(sb)) + 1;
1823         db_count = (sbi->s_groups_count + EXT3_DESC_PER_BLOCK(sb) - 1) /
1824                    EXT3_DESC_PER_BLOCK(sb);
1825         sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1826                                     GFP_KERNEL);
1827         if (sbi->s_group_desc == NULL) {
1828                 printk (KERN_ERR "EXT3-fs: not enough memory\n");
1829                 goto failed_mount;
1830         }
1831
1832         bgl_lock_init(sbi->s_blockgroup_lock);
1833
1834         for (i = 0; i < db_count; i++) {
1835                 block = descriptor_loc(sb, logic_sb_block, i);
1836                 sbi->s_group_desc[i] = sb_bread(sb, block);
1837                 if (!sbi->s_group_desc[i]) {
1838                         printk (KERN_ERR "EXT3-fs: "
1839                                 "can't read group descriptor %d\n", i);
1840                         db_count = i;
1841                         goto failed_mount2;
1842                 }
1843         }
1844         if (!ext3_check_descriptors (sb)) {
1845                 printk(KERN_ERR "EXT3-fs: group descriptors corrupted!\n");
1846                 goto failed_mount2;
1847         }
1848         sbi->s_gdb_count = db_count;
1849         get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1850         spin_lock_init(&sbi->s_next_gen_lock);
1851
1852         err = percpu_counter_init(&sbi->s_freeblocks_counter,
1853                         ext3_count_free_blocks(sb));
1854         if (!err) {
1855                 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1856                                 ext3_count_free_inodes(sb));
1857         }
1858         if (!err) {
1859                 err = percpu_counter_init(&sbi->s_dirs_counter,
1860                                 ext3_count_dirs(sb));
1861         }
1862         if (err) {
1863                 printk(KERN_ERR "EXT3-fs: insufficient memory\n");
1864                 goto failed_mount3;
1865         }
1866
1867         /* per fileystem reservation list head & lock */
1868         spin_lock_init(&sbi->s_rsv_window_lock);
1869         sbi->s_rsv_window_root = RB_ROOT;
1870         /* Add a single, static dummy reservation to the start of the
1871          * reservation window list --- it gives us a placeholder for
1872          * append-at-start-of-list which makes the allocation logic
1873          * _much_ simpler. */
1874         sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1875         sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1876         sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1877         sbi->s_rsv_window_head.rsv_goal_size = 0;
1878         ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1879
1880         /*
1881          * set up enough so that it can read an inode
1882          */
1883         sb->s_op = &ext3_sops;
1884         sb->s_export_op = &ext3_export_ops;
1885         sb->s_xattr = ext3_xattr_handlers;
1886 #ifdef CONFIG_QUOTA
1887         sb->s_qcop = &ext3_qctl_operations;
1888         sb->dq_op = &ext3_quota_operations;
1889 #endif
1890         INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1891
1892         sb->s_root = NULL;
1893
1894         needs_recovery = (es->s_last_orphan != 0 ||
1895                           EXT3_HAS_INCOMPAT_FEATURE(sb,
1896                                     EXT3_FEATURE_INCOMPAT_RECOVER));
1897
1898         /*
1899          * The first inode we look at is the journal inode.  Don't try
1900          * root first: it may be modified in the journal!
1901          */
1902         if (!test_opt(sb, NOLOAD) &&
1903             EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
1904                 if (ext3_load_journal(sb, es, journal_devnum))
1905                         goto failed_mount3;
1906         } else if (journal_inum) {
1907                 if (ext3_create_journal(sb, es, journal_inum))
1908                         goto failed_mount3;
1909         } else {
1910                 if (!silent)
1911                         printk (KERN_ERR
1912                                 "ext3: No journal on filesystem on %s\n",
1913                                 sb->s_id);
1914                 goto failed_mount3;
1915         }
1916
1917         /* We have now updated the journal if required, so we can
1918          * validate the data journaling mode. */
1919         switch (test_opt(sb, DATA_FLAGS)) {
1920         case 0:
1921                 /* No mode set, assume a default based on the journal
1922                    capabilities: ORDERED_DATA if the journal can
1923                    cope, else JOURNAL_DATA */
1924                 if (journal_check_available_features
1925                     (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
1926                         set_opt(sbi->s_mount_opt, DEFAULT_DATA_MODE);
1927                 else
1928                         set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1929                 break;
1930
1931         case EXT3_MOUNT_ORDERED_DATA:
1932         case EXT3_MOUNT_WRITEBACK_DATA:
1933                 if (!journal_check_available_features
1934                     (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
1935                         printk(KERN_ERR "EXT3-fs: Journal does not support "
1936                                "requested data journaling mode\n");
1937                         goto failed_mount4;
1938                 }
1939         default:
1940                 break;
1941         }
1942
1943         if (test_opt(sb, NOBH)) {
1944                 if (!(test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)) {
1945                         printk(KERN_WARNING "EXT3-fs: Ignoring nobh option - "
1946                                 "its supported only with writeback mode\n");
1947                         clear_opt(sbi->s_mount_opt, NOBH);
1948                 }
1949         }
1950         /*
1951          * The journal_load will have done any necessary log recovery,
1952          * so we can safely mount the rest of the filesystem now.
1953          */
1954
1955         root = ext3_iget(sb, EXT3_ROOT_INO);
1956         if (IS_ERR(root)) {
1957                 printk(KERN_ERR "EXT3-fs: get root inode failed\n");
1958                 ret = PTR_ERR(root);
1959                 goto failed_mount4;
1960         }
1961         if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1962                 iput(root);
1963                 printk(KERN_ERR "EXT3-fs: corrupt root inode, run e2fsck\n");
1964                 goto failed_mount4;
1965         }
1966         sb->s_root = d_alloc_root(root);
1967         if (!sb->s_root) {
1968                 printk(KERN_ERR "EXT3-fs: get root dentry failed\n");
1969                 iput(root);
1970                 ret = -ENOMEM;
1971                 goto failed_mount4;
1972         }
1973
1974         ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
1975         /*
1976          * akpm: core read_super() calls in here with the superblock locked.
1977          * That deadlocks, because orphan cleanup needs to lock the superblock
1978          * in numerous places.  Here we just pop the lock - it's relatively
1979          * harmless, because we are now ready to accept write_super() requests,
1980          * and aviro says that's the only reason for hanging onto the
1981          * superblock lock.
1982          */
1983         EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
1984         ext3_orphan_cleanup(sb, es);
1985         EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
1986         if (needs_recovery)
1987                 printk (KERN_INFO "EXT3-fs: recovery complete.\n");
1988         ext3_mark_recovery_complete(sb, es);
1989         printk (KERN_INFO "EXT3-fs: mounted filesystem with %s data mode.\n",
1990                 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
1991                 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
1992                 "writeback");
1993
1994         lock_kernel();
1995         return 0;
1996
1997 cantfind_ext3:
1998         if (!silent)
1999                 printk(KERN_ERR "VFS: Can't find ext3 filesystem on dev %s.\n",
2000                        sb->s_id);
2001         goto failed_mount;
2002
2003 failed_mount4:
2004         journal_destroy(sbi->s_journal);
2005 failed_mount3:
2006         percpu_counter_destroy(&sbi->s_freeblocks_counter);
2007         percpu_counter_destroy(&sbi->s_freeinodes_counter);
2008         percpu_counter_destroy(&sbi->s_dirs_counter);
2009 failed_mount2:
2010         for (i = 0; i < db_count; i++)
2011                 brelse(sbi->s_group_desc[i]);
2012         kfree(sbi->s_group_desc);
2013 failed_mount:
2014 #ifdef CONFIG_QUOTA
2015         for (i = 0; i < MAXQUOTAS; i++)
2016                 kfree(sbi->s_qf_names[i]);
2017 #endif
2018         ext3_blkdev_remove(sbi);
2019         brelse(bh);
2020 out_fail:
2021         sb->s_fs_info = NULL;
2022         kfree(sbi->s_blockgroup_lock);
2023         kfree(sbi);
2024         lock_kernel();
2025         return ret;
2026 }
2027
2028 /*
2029  * Setup any per-fs journal parameters now.  We'll do this both on
2030  * initial mount, once the journal has been initialised but before we've
2031  * done any recovery; and again on any subsequent remount.
2032  */
2033 static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
2034 {
2035         struct ext3_sb_info *sbi = EXT3_SB(sb);
2036
2037         if (sbi->s_commit_interval)
2038                 journal->j_commit_interval = sbi->s_commit_interval;
2039         /* We could also set up an ext3-specific default for the commit
2040          * interval here, but for now we'll just fall back to the jbd
2041          * default. */
2042
2043         spin_lock(&journal->j_state_lock);
2044         if (test_opt(sb, BARRIER))
2045                 journal->j_flags |= JFS_BARRIER;
2046         else
2047                 journal->j_flags &= ~JFS_BARRIER;
2048         if (test_opt(sb, DATA_ERR_ABORT))
2049                 journal->j_flags |= JFS_ABORT_ON_SYNCDATA_ERR;
2050         else
2051                 journal->j_flags &= ~JFS_ABORT_ON_SYNCDATA_ERR;
2052         spin_unlock(&journal->j_state_lock);
2053 }
2054
2055 static journal_t *ext3_get_journal(struct super_block *sb,
2056                                    unsigned int journal_inum)
2057 {
2058         struct inode *journal_inode;
2059         journal_t *journal;
2060
2061         /* First, test for the existence of a valid inode on disk.  Bad
2062          * things happen if we iget() an unused inode, as the subsequent
2063          * iput() will try to delete it. */
2064
2065         journal_inode = ext3_iget(sb, journal_inum);
2066         if (IS_ERR(journal_inode)) {
2067                 printk(KERN_ERR "EXT3-fs: no journal found.\n");
2068                 return NULL;
2069         }
2070         if (!journal_inode->i_nlink) {
2071                 make_bad_inode(journal_inode);
2072                 iput(journal_inode);
2073                 printk(KERN_ERR "EXT3-fs: journal inode is deleted.\n");
2074                 return NULL;
2075         }
2076
2077         jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2078                   journal_inode, journal_inode->i_size);
2079         if (!S_ISREG(journal_inode->i_mode)) {
2080                 printk(KERN_ERR "EXT3-fs: invalid journal inode.\n");
2081                 iput(journal_inode);
2082                 return NULL;
2083         }
2084
2085         journal = journal_init_inode(journal_inode);
2086         if (!journal) {
2087                 printk(KERN_ERR "EXT3-fs: Could not load journal inode\n");
2088                 iput(journal_inode);
2089                 return NULL;
2090         }
2091         journal->j_private = sb;
2092         ext3_init_journal_params(sb, journal);
2093         return journal;
2094 }
2095
2096 static journal_t *ext3_get_dev_journal(struct super_block *sb,
2097                                        dev_t j_dev)
2098 {
2099         struct buffer_head * bh;
2100         journal_t *journal;
2101         ext3_fsblk_t start;
2102         ext3_fsblk_t len;
2103         int hblock, blocksize;
2104         ext3_fsblk_t sb_block;
2105         unsigned long offset;
2106         struct ext3_super_block * es;
2107         struct block_device *bdev;
2108
2109         bdev = ext3_blkdev_get(j_dev);
2110         if (bdev == NULL)
2111                 return NULL;
2112
2113         if (bd_claim(bdev, sb)) {
2114                 printk(KERN_ERR
2115                         "EXT3: failed to claim external journal device.\n");
2116                 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
2117                 return NULL;
2118         }
2119
2120         blocksize = sb->s_blocksize;
2121         hblock = bdev_logical_block_size(bdev);
2122         if (blocksize < hblock) {
2123                 printk(KERN_ERR
2124                         "EXT3-fs: blocksize too small for journal device.\n");
2125                 goto out_bdev;
2126         }
2127
2128         sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
2129         offset = EXT3_MIN_BLOCK_SIZE % blocksize;
2130         set_blocksize(bdev, blocksize);
2131         if (!(bh = __bread(bdev, sb_block, blocksize))) {
2132                 printk(KERN_ERR "EXT3-fs: couldn't read superblock of "
2133                        "external journal\n");
2134                 goto out_bdev;
2135         }
2136
2137         es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
2138         if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
2139             !(le32_to_cpu(es->s_feature_incompat) &
2140               EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2141                 printk(KERN_ERR "EXT3-fs: external journal has "
2142                                         "bad superblock\n");
2143                 brelse(bh);
2144                 goto out_bdev;
2145         }
2146
2147         if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2148                 printk(KERN_ERR "EXT3-fs: journal UUID does not match\n");
2149                 brelse(bh);
2150                 goto out_bdev;
2151         }
2152
2153         len = le32_to_cpu(es->s_blocks_count);
2154         start = sb_block + 1;
2155         brelse(bh);     /* we're done with the superblock */
2156
2157         journal = journal_init_dev(bdev, sb->s_bdev,
2158                                         start, len, blocksize);
2159         if (!journal) {
2160                 printk(KERN_ERR "EXT3-fs: failed to create device journal\n");
2161                 goto out_bdev;
2162         }
2163         journal->j_private = sb;
2164         ll_rw_block(READ, 1, &journal->j_sb_buffer);
2165         wait_on_buffer(journal->j_sb_buffer);
2166         if (!buffer_uptodate(journal->j_sb_buffer)) {
2167                 printk(KERN_ERR "EXT3-fs: I/O error on journal device\n");
2168                 goto out_journal;
2169         }
2170         if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
2171                 printk(KERN_ERR "EXT3-fs: External journal has more than one "
2172                                         "user (unsupported) - %d\n",
2173                         be32_to_cpu(journal->j_superblock->s_nr_users));
2174                 goto out_journal;
2175         }
2176         EXT3_SB(sb)->journal_bdev = bdev;
2177         ext3_init_journal_params(sb, journal);
2178         return journal;
2179 out_journal:
2180         journal_destroy(journal);
2181 out_bdev:
2182         ext3_blkdev_put(bdev);
2183         return NULL;
2184 }
2185
2186 static int ext3_load_journal(struct super_block *sb,
2187                              struct ext3_super_block *es,
2188                              unsigned long journal_devnum)
2189 {
2190         journal_t *journal;
2191         unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2192         dev_t journal_dev;
2193         int err = 0;
2194         int really_read_only;
2195
2196         if (journal_devnum &&
2197             journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2198                 printk(KERN_INFO "EXT3-fs: external journal device major/minor "
2199                         "numbers have changed\n");
2200                 journal_dev = new_decode_dev(journal_devnum);
2201         } else
2202                 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2203
2204         really_read_only = bdev_read_only(sb->s_bdev);
2205
2206         /*
2207          * Are we loading a blank journal or performing recovery after a
2208          * crash?  For recovery, we need to check in advance whether we
2209          * can get read-write access to the device.
2210          */
2211
2212         if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
2213                 if (sb->s_flags & MS_RDONLY) {
2214                         printk(KERN_INFO "EXT3-fs: INFO: recovery "
2215                                         "required on readonly filesystem.\n");
2216                         if (really_read_only) {
2217                                 printk(KERN_ERR "EXT3-fs: write access "
2218                                         "unavailable, cannot proceed.\n");
2219                                 return -EROFS;
2220                         }
2221                         printk (KERN_INFO "EXT3-fs: write access will "
2222                                         "be enabled during recovery.\n");
2223                 }
2224         }
2225
2226         if (journal_inum && journal_dev) {
2227                 printk(KERN_ERR "EXT3-fs: filesystem has both journal "
2228                        "and inode journals!\n");
2229                 return -EINVAL;
2230         }
2231
2232         if (journal_inum) {
2233                 if (!(journal = ext3_get_journal(sb, journal_inum)))
2234                         return -EINVAL;
2235         } else {
2236                 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
2237                         return -EINVAL;
2238         }
2239
2240         if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2241                 err = journal_update_format(journal);
2242                 if (err)  {
2243                         printk(KERN_ERR "EXT3-fs: error updating journal.\n");
2244                         journal_destroy(journal);
2245                         return err;
2246                 }
2247         }
2248
2249         if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
2250                 err = journal_wipe(journal, !really_read_only);
2251         if (!err)
2252                 err = journal_load(journal);
2253
2254         if (err) {
2255                 printk(KERN_ERR "EXT3-fs: error loading journal.\n");
2256                 journal_destroy(journal);
2257                 return err;
2258         }
2259
2260         EXT3_SB(sb)->s_journal = journal;
2261         ext3_clear_journal_err(sb, es);
2262
2263         if (journal_devnum &&
2264             journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2265                 es->s_journal_dev = cpu_to_le32(journal_devnum);
2266
2267                 /* Make sure we flush the recovery flag to disk. */
2268                 ext3_commit_super(sb, es, 1);
2269         }
2270
2271         return 0;
2272 }
2273
2274 static int ext3_create_journal(struct super_block * sb,
2275                                struct ext3_super_block * es,
2276                                unsigned int journal_inum)
2277 {
2278         journal_t *journal;
2279         int err;
2280
2281         if (sb->s_flags & MS_RDONLY) {
2282                 printk(KERN_ERR "EXT3-fs: readonly filesystem when trying to "
2283                                 "create journal.\n");
2284                 return -EROFS;
2285         }
2286
2287         journal = ext3_get_journal(sb, journal_inum);
2288         if (!journal)
2289                 return -EINVAL;
2290
2291         printk(KERN_INFO "EXT3-fs: creating new journal on inode %u\n",
2292                journal_inum);
2293
2294         err = journal_create(journal);
2295         if (err) {
2296                 printk(KERN_ERR "EXT3-fs: error creating journal.\n");
2297                 journal_destroy(journal);
2298                 return -EIO;
2299         }
2300
2301         EXT3_SB(sb)->s_journal = journal;
2302
2303         ext3_update_dynamic_rev(sb);
2304         EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2305         EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2306
2307         es->s_journal_inum = cpu_to_le32(journal_inum);
2308
2309         /* Make sure we flush the recovery flag to disk. */
2310         ext3_commit_super(sb, es, 1);
2311
2312         return 0;
2313 }
2314
2315 static int ext3_commit_super(struct super_block *sb,
2316                                struct ext3_super_block *es,
2317                                int sync)
2318 {
2319         struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
2320         int error = 0;
2321
2322         if (!sbh)
2323                 return error;
2324         es->s_wtime = cpu_to_le32(get_seconds());
2325         es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2326         es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2327         BUFFER_TRACE(sbh, "marking dirty");
2328         mark_buffer_dirty(sbh);
2329         if (sync)
2330                 error = sync_dirty_buffer(sbh);
2331         return error;
2332 }
2333
2334
2335 /*
2336  * Have we just finished recovery?  If so, and if we are mounting (or
2337  * remounting) the filesystem readonly, then we will end up with a
2338  * consistent fs on disk.  Record that fact.
2339  */
2340 static void ext3_mark_recovery_complete(struct super_block * sb,
2341                                         struct ext3_super_block * es)
2342 {
2343         journal_t *journal = EXT3_SB(sb)->s_journal;
2344
2345         journal_lock_updates(journal);
2346         if (journal_flush(journal) < 0)
2347                 goto out;
2348
2349         lock_super(sb);
2350         if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2351             sb->s_flags & MS_RDONLY) {
2352                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2353                 ext3_commit_super(sb, es, 1);
2354         }
2355         unlock_super(sb);
2356
2357 out:
2358         journal_unlock_updates(journal);
2359 }
2360
2361 /*
2362  * If we are mounting (or read-write remounting) a filesystem whose journal
2363  * has recorded an error from a previous lifetime, move that error to the
2364  * main filesystem now.
2365  */
2366 static void ext3_clear_journal_err(struct super_block * sb,
2367                                    struct ext3_super_block * es)
2368 {
2369         journal_t *journal;
2370         int j_errno;
2371         const char *errstr;
2372
2373         journal = EXT3_SB(sb)->s_journal;
2374
2375         /*
2376          * Now check for any error status which may have been recorded in the
2377          * journal by a prior ext3_error() or ext3_abort()
2378          */
2379
2380         j_errno = journal_errno(journal);
2381         if (j_errno) {
2382                 char nbuf[16];
2383
2384                 errstr = ext3_decode_error(sb, j_errno, nbuf);
2385                 ext3_warning(sb, __func__, "Filesystem error recorded "
2386                              "from previous mount: %s", errstr);
2387                 ext3_warning(sb, __func__, "Marking fs in need of "
2388                              "filesystem check.");
2389
2390                 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2391                 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2392                 ext3_commit_super (sb, es, 1);
2393
2394                 journal_clear_err(journal);
2395         }
2396 }
2397
2398 /*
2399  * Force the running and committing transactions to commit,
2400  * and wait on the commit.
2401  */
2402 int ext3_force_commit(struct super_block *sb)
2403 {
2404         journal_t *journal;
2405         int ret;
2406
2407         if (sb->s_flags & MS_RDONLY)
2408                 return 0;
2409
2410         journal = EXT3_SB(sb)->s_journal;
2411         ret = ext3_journal_force_commit(journal);
2412         return ret;
2413 }
2414
2415 static int ext3_sync_fs(struct super_block *sb, int wait)
2416 {
2417         tid_t target;
2418
2419         if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2420                 if (wait)
2421                         log_wait_commit(EXT3_SB(sb)->s_journal, target);
2422         }
2423         return 0;
2424 }
2425
2426 /*
2427  * LVM calls this function before a (read-only) snapshot is created.  This
2428  * gives us a chance to flush the journal completely and mark the fs clean.
2429  */
2430 static int ext3_freeze(struct super_block *sb)
2431 {
2432         int error = 0;
2433         journal_t *journal;
2434
2435         if (!(sb->s_flags & MS_RDONLY)) {
2436                 journal = EXT3_SB(sb)->s_journal;
2437
2438                 /* Now we set up the journal barrier. */
2439                 journal_lock_updates(journal);
2440
2441                 /*
2442                  * We don't want to clear needs_recovery flag when we failed
2443                  * to flush the journal.
2444                  */
2445                 error = journal_flush(journal);
2446                 if (error < 0)
2447                         goto out;
2448
2449                 /* Journal blocked and flushed, clear needs_recovery flag. */
2450                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2451                 error = ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2452                 if (error)
2453                         goto out;
2454         }
2455         return 0;
2456
2457 out:
2458         journal_unlock_updates(journal);
2459         return error;
2460 }
2461
2462 /*
2463  * Called by LVM after the snapshot is done.  We need to reset the RECOVER
2464  * flag here, even though the filesystem is not technically dirty yet.
2465  */
2466 static int ext3_unfreeze(struct super_block *sb)
2467 {
2468         if (!(sb->s_flags & MS_RDONLY)) {
2469                 lock_super(sb);
2470                 /* Reser the needs_recovery flag before the fs is unlocked. */
2471                 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2472                 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2473                 unlock_super(sb);
2474                 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2475         }
2476         return 0;
2477 }
2478
2479 static int ext3_remount (struct super_block * sb, int * flags, char * data)
2480 {
2481         struct ext3_super_block * es;
2482         struct ext3_sb_info *sbi = EXT3_SB(sb);
2483         ext3_fsblk_t n_blocks_count = 0;
2484         unsigned long old_sb_flags;
2485         struct ext3_mount_options old_opts;
2486         int err;
2487 #ifdef CONFIG_QUOTA
2488         int i;
2489 #endif
2490
2491         lock_kernel();
2492
2493         /* Store the original options */
2494         lock_super(sb);
2495         old_sb_flags = sb->s_flags;
2496         old_opts.s_mount_opt = sbi->s_mount_opt;
2497         old_opts.s_resuid = sbi->s_resuid;
2498         old_opts.s_resgid = sbi->s_resgid;
2499         old_opts.s_commit_interval = sbi->s_commit_interval;
2500 #ifdef CONFIG_QUOTA
2501         old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2502         for (i = 0; i < MAXQUOTAS; i++)
2503                 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2504 #endif
2505
2506         /*
2507          * Allow the "check" option to be passed as a remount option.
2508          */
2509         if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2510                 err = -EINVAL;
2511                 goto restore_opts;
2512         }
2513
2514         if (sbi->s_mount_opt & EXT3_MOUNT_ABORT)
2515                 ext3_abort(sb, __func__, "Abort forced by user");
2516
2517         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2518                 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2519
2520         es = sbi->s_es;
2521
2522         ext3_init_journal_params(sb, sbi->s_journal);
2523
2524         if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2525                 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
2526                 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT) {
2527                         err = -EROFS;
2528                         goto restore_opts;
2529                 }
2530
2531                 if (*flags & MS_RDONLY) {
2532                         /*
2533                          * First of all, the unconditional stuff we have to do
2534                          * to disable replay of the journal when we next remount
2535                          */
2536                         sb->s_flags |= MS_RDONLY;
2537
2538                         /*
2539                          * OK, test if we are remounting a valid rw partition
2540                          * readonly, and if so set the rdonly flag and then
2541                          * mark the partition as valid again.
2542                          */
2543                         if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2544                             (sbi->s_mount_state & EXT3_VALID_FS))
2545                                 es->s_state = cpu_to_le16(sbi->s_mount_state);
2546
2547                         /*
2548                          * We have to unlock super so that we can wait for
2549                          * transactions.
2550                          */
2551                         unlock_super(sb);
2552                         ext3_mark_recovery_complete(sb, es);
2553                         lock_super(sb);
2554                 } else {
2555                         __le32 ret;
2556                         if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2557                                         ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2558                                 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2559                                        "remount RDWR because of unsupported "
2560                                        "optional features (%x).\n",
2561                                        sb->s_id, le32_to_cpu(ret));
2562                                 err = -EROFS;
2563                                 goto restore_opts;
2564                         }
2565
2566                         /*
2567                          * If we have an unprocessed orphan list hanging
2568                          * around from a previously readonly bdev mount,
2569                          * require a full umount/remount for now.
2570                          */
2571                         if (es->s_last_orphan) {
2572                                 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2573                                        "remount RDWR because of unprocessed "
2574                                        "orphan inode list.  Please "
2575                                        "umount/remount instead.\n",
2576                                        sb->s_id);
2577                                 err = -EINVAL;
2578                                 goto restore_opts;
2579                         }
2580
2581                         /*
2582                          * Mounting a RDONLY partition read-write, so reread
2583                          * and store the current valid flag.  (It may have
2584                          * been changed by e2fsck since we originally mounted
2585                          * the partition.)
2586                          */
2587                         ext3_clear_journal_err(sb, es);
2588                         sbi->s_mount_state = le16_to_cpu(es->s_state);
2589                         if ((err = ext3_group_extend(sb, es, n_blocks_count)))
2590                                 goto restore_opts;
2591                         if (!ext3_setup_super (sb, es, 0))
2592                                 sb->s_flags &= ~MS_RDONLY;
2593                 }
2594         }
2595 #ifdef CONFIG_QUOTA
2596         /* Release old quota file names */
2597         for (i = 0; i < MAXQUOTAS; i++)
2598                 if (old_opts.s_qf_names[i] &&
2599                     old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2600                         kfree(old_opts.s_qf_names[i]);
2601 #endif
2602         unlock_super(sb);
2603         unlock_kernel();
2604         return 0;
2605 restore_opts:
2606         sb->s_flags = old_sb_flags;
2607         sbi->s_mount_opt = old_opts.s_mount_opt;
2608         sbi->s_resuid = old_opts.s_resuid;
2609         sbi->s_resgid = old_opts.s_resgid;
2610         sbi->s_commit_interval = old_opts.s_commit_interval;
2611 #ifdef CONFIG_QUOTA
2612         sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2613         for (i = 0; i < MAXQUOTAS; i++) {
2614                 if (sbi->s_qf_names[i] &&
2615                     old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2616                         kfree(sbi->s_qf_names[i]);
2617                 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2618         }
2619 #endif
2620         unlock_super(sb);
2621         unlock_kernel();
2622         return err;
2623 }
2624
2625 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
2626 {
2627         struct super_block *sb = dentry->d_sb;
2628         struct ext3_sb_info *sbi = EXT3_SB(sb);
2629         struct ext3_super_block *es = sbi->s_es;
2630         u64 fsid;
2631
2632         if (test_opt(sb, MINIX_DF)) {
2633                 sbi->s_overhead_last = 0;
2634         } else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
2635                 unsigned long ngroups = sbi->s_groups_count, i;
2636                 ext3_fsblk_t overhead = 0;
2637                 smp_rmb();
2638
2639                 /*
2640                  * Compute the overhead (FS structures).  This is constant
2641                  * for a given filesystem unless the number of block groups
2642                  * changes so we cache the previous value until it does.
2643                  */
2644
2645                 /*
2646                  * All of the blocks before first_data_block are
2647                  * overhead
2648                  */
2649                 overhead = le32_to_cpu(es->s_first_data_block);
2650
2651                 /*
2652                  * Add the overhead attributed to the superblock and
2653                  * block group descriptors.  If the sparse superblocks
2654                  * feature is turned on, then not all groups have this.
2655                  */
2656                 for (i = 0; i < ngroups; i++) {
2657                         overhead += ext3_bg_has_super(sb, i) +
2658                                 ext3_bg_num_gdb(sb, i);
2659                         cond_resched();
2660                 }
2661
2662                 /*
2663                  * Every block group has an inode bitmap, a block
2664                  * bitmap, and an inode table.
2665                  */
2666                 overhead += ngroups * (2 + sbi->s_itb_per_group);
2667                 sbi->s_overhead_last = overhead;
2668                 smp_wmb();
2669                 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
2670         }
2671
2672         buf->f_type = EXT3_SUPER_MAGIC;
2673         buf->f_bsize = sb->s_blocksize;
2674         buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
2675         buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
2676         es->s_free_blocks_count = cpu_to_le32(buf->f_bfree);
2677         buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2678         if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2679                 buf->f_bavail = 0;
2680         buf->f_files = le32_to_cpu(es->s_inodes_count);
2681         buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
2682         es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
2683         buf->f_namelen = EXT3_NAME_LEN;
2684         fsid = le64_to_cpup((void *)es->s_uuid) ^
2685                le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2686         buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2687         buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
2688         return 0;
2689 }
2690
2691 /* Helper function for writing quotas on sync - we need to start transaction before quota file
2692  * is locked for write. Otherwise the are possible deadlocks:
2693  * Process 1                         Process 2
2694  * ext3_create()                     quota_sync()
2695  *   journal_start()                   write_dquot()
2696  *   vfs_dq_init()                       down(dqio_mutex)
2697  *     down(dqio_mutex)                    journal_start()
2698  *
2699  */
2700
2701 #ifdef CONFIG_QUOTA
2702
2703 static inline struct inode *dquot_to_inode(struct dquot *dquot)
2704 {
2705         return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2706 }
2707
2708 static int ext3_write_dquot(struct dquot *dquot)
2709 {
2710         int ret, err;
2711         handle_t *handle;
2712         struct inode *inode;
2713
2714         inode = dquot_to_inode(dquot);
2715         handle = ext3_journal_start(inode,
2716                                         EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2717         if (IS_ERR(handle))
2718                 return PTR_ERR(handle);
2719         ret = dquot_commit(dquot);
2720         err = ext3_journal_stop(handle);
2721         if (!ret)
2722                 ret = err;
2723         return ret;
2724 }
2725
2726 static int ext3_acquire_dquot(struct dquot *dquot)
2727 {
2728         int ret, err;
2729         handle_t *handle;
2730
2731         handle = ext3_journal_start(dquot_to_inode(dquot),
2732                                         EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2733         if (IS_ERR(handle))
2734                 return PTR_ERR(handle);
2735         ret = dquot_acquire(dquot);
2736         err = ext3_journal_stop(handle);
2737         if (!ret)
2738                 ret = err;
2739         return ret;
2740 }
2741
2742 static int ext3_release_dquot(struct dquot *dquot)
2743 {
2744         int ret, err;
2745         handle_t *handle;
2746
2747         handle = ext3_journal_start(dquot_to_inode(dquot),
2748                                         EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2749         if (IS_ERR(handle)) {
2750                 /* Release dquot anyway to avoid endless cycle in dqput() */
2751                 dquot_release(dquot);
2752                 return PTR_ERR(handle);
2753         }
2754         ret = dquot_release(dquot);
2755         err = ext3_journal_stop(handle);
2756         if (!ret)
2757                 ret = err;
2758         return ret;
2759 }
2760
2761 static int ext3_mark_dquot_dirty(struct dquot *dquot)
2762 {
2763         /* Are we journaling quotas? */
2764         if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2765             EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2766                 dquot_mark_dquot_dirty(dquot);
2767                 return ext3_write_dquot(dquot);
2768         } else {
2769                 return dquot_mark_dquot_dirty(dquot);
2770         }
2771 }
2772
2773 static int ext3_write_info(struct super_block *sb, int type)
2774 {
2775         int ret, err;
2776         handle_t *handle;
2777
2778         /* Data block + inode block */
2779         handle = ext3_journal_start(sb->s_root->d_inode, 2);
2780         if (IS_ERR(handle))
2781                 return PTR_ERR(handle);
2782         ret = dquot_commit_info(sb, type);
2783         err = ext3_journal_stop(handle);
2784         if (!ret)
2785                 ret = err;
2786         return ret;
2787 }
2788
2789 /*
2790  * Turn on quotas during mount time - we need to find
2791  * the quota file and such...
2792  */
2793 static int ext3_quota_on_mount(struct super_block *sb, int type)
2794 {
2795         return vfs_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2796                         EXT3_SB(sb)->s_jquota_fmt, type);
2797 }
2798
2799 /*
2800  * Standard function to be called on quota_on
2801  */
2802 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
2803                          char *name, int remount)
2804 {
2805         int err;
2806         struct path path;
2807
2808         if (!test_opt(sb, QUOTA))
2809                 return -EINVAL;
2810         /* When remounting, no checks are needed and in fact, name is NULL */
2811         if (remount)
2812                 return vfs_quota_on(sb, type, format_id, name, remount);
2813
2814         err = kern_path(name, LOOKUP_FOLLOW, &path);
2815         if (err)
2816                 return err;
2817
2818         /* Quotafile not on the same filesystem? */
2819         if (path.mnt->mnt_sb != sb) {
2820                 path_put(&path);
2821                 return -EXDEV;
2822         }
2823         /* Journaling quota? */
2824         if (EXT3_SB(sb)->s_qf_names[type]) {
2825                 /* Quotafile not of fs root? */
2826                 if (path.dentry->d_parent != sb->s_root)
2827                         printk(KERN_WARNING
2828                                 "EXT3-fs: Quota file not on filesystem root. "
2829                                 "Journaled quota will not work.\n");
2830         }
2831
2832         /*
2833          * When we journal data on quota file, we have to flush journal to see
2834          * all updates to the file when we bypass pagecache...
2835          */
2836         if (ext3_should_journal_data(path.dentry->d_inode)) {
2837                 /*
2838                  * We don't need to lock updates but journal_flush() could
2839                  * otherwise be livelocked...
2840                  */
2841                 journal_lock_updates(EXT3_SB(sb)->s_journal);
2842                 err = journal_flush(EXT3_SB(sb)->s_journal);
2843                 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2844                 if (err) {
2845                         path_put(&path);
2846                         return err;
2847                 }
2848         }
2849
2850         err = vfs_quota_on_path(sb, type, format_id, &path);
2851         path_put(&path);
2852         return err;
2853 }
2854
2855 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2856  * acquiring the locks... As quota files are never truncated and quota code
2857  * itself serializes the operations (and noone else should touch the files)
2858  * we don't have to be afraid of races */
2859 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2860                                size_t len, loff_t off)
2861 {
2862         struct inode *inode = sb_dqopt(sb)->files[type];
2863         sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2864         int err = 0;
2865         int offset = off & (sb->s_blocksize - 1);
2866         int tocopy;
2867         size_t toread;
2868         struct buffer_head *bh;
2869         loff_t i_size = i_size_read(inode);
2870
2871         if (off > i_size)
2872                 return 0;
2873         if (off+len > i_size)
2874                 len = i_size-off;
2875         toread = len;
2876         while (toread > 0) {
2877                 tocopy = sb->s_blocksize - offset < toread ?
2878                                 sb->s_blocksize - offset : toread;
2879                 bh = ext3_bread(NULL, inode, blk, 0, &err);
2880                 if (err)
2881                         return err;
2882                 if (!bh)        /* A hole? */
2883                         memset(data, 0, tocopy);
2884                 else
2885                         memcpy(data, bh->b_data+offset, tocopy);
2886                 brelse(bh);
2887                 offset = 0;
2888                 toread -= tocopy;
2889                 data += tocopy;
2890                 blk++;
2891         }
2892         return len;
2893 }
2894
2895 /* Write to quotafile (we know the transaction is already started and has
2896  * enough credits) */
2897 static ssize_t ext3_quota_write(struct super_block *sb, int type,
2898                                 const char *data, size_t len, loff_t off)
2899 {
2900         struct inode *inode = sb_dqopt(sb)->files[type];
2901         sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2902         int err = 0;
2903         int offset = off & (sb->s_blocksize - 1);
2904         int tocopy;
2905         int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
2906         size_t towrite = len;
2907         struct buffer_head *bh;
2908         handle_t *handle = journal_current_handle();
2909
2910         if (!handle) {
2911                 printk(KERN_WARNING "EXT3-fs: Quota write (off=%Lu, len=%Lu)"
2912                         " cancelled because transaction is not started.\n",
2913                         (unsigned long long)off, (unsigned long long)len);
2914                 return -EIO;
2915         }
2916         mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2917         while (towrite > 0) {
2918                 tocopy = sb->s_blocksize - offset < towrite ?
2919                                 sb->s_blocksize - offset : towrite;
2920                 bh = ext3_bread(handle, inode, blk, 1, &err);
2921                 if (!bh)
2922                         goto out;
2923                 if (journal_quota) {
2924                         err = ext3_journal_get_write_access(handle, bh);
2925                         if (err) {
2926                                 brelse(bh);
2927                                 goto out;
2928                         }
2929                 }
2930                 lock_buffer(bh);
2931                 memcpy(bh->b_data+offset, data, tocopy);
2932                 flush_dcache_page(bh->b_page);
2933                 unlock_buffer(bh);
2934                 if (journal_quota)
2935                         err = ext3_journal_dirty_metadata(handle, bh);
2936                 else {
2937                         /* Always do at least ordered writes for quotas */
2938                         err = ext3_journal_dirty_data(handle, bh);
2939                         mark_buffer_dirty(bh);
2940                 }
2941                 brelse(bh);
2942                 if (err)
2943                         goto out;
2944                 offset = 0;
2945                 towrite -= tocopy;
2946                 data += tocopy;
2947                 blk++;
2948         }
2949 out:
2950         if (len == towrite) {
2951                 mutex_unlock(&inode->i_mutex);
2952                 return err;
2953         }
2954         if (inode->i_size < off+len-towrite) {
2955                 i_size_write(inode, off+len-towrite);
2956                 EXT3_I(inode)->i_disksize = inode->i_size;
2957         }
2958         inode->i_version++;
2959         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2960         ext3_mark_inode_dirty(handle, inode);
2961         mutex_unlock(&inode->i_mutex);
2962         return len - towrite;
2963 }
2964
2965 #endif
2966
2967 static int ext3_get_sb(struct file_system_type *fs_type,
2968         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
2969 {
2970         return get_sb_bdev(fs_type, flags, dev_name, data, ext3_fill_super, mnt);
2971 }
2972
2973 static struct file_system_type ext3_fs_type = {
2974         .owner          = THIS_MODULE,
2975         .name           = "ext3",
2976         .get_sb         = ext3_get_sb,
2977         .kill_sb        = kill_block_super,
2978         .fs_flags       = FS_REQUIRES_DEV,
2979 };
2980
2981 static int __init init_ext3_fs(void)
2982 {
2983         int err = init_ext3_xattr();
2984         if (err)
2985                 return err;
2986         err = init_inodecache();
2987         if (err)
2988                 goto out1;
2989         err = register_filesystem(&ext3_fs_type);
2990         if (err)
2991                 goto out;
2992         return 0;
2993 out:
2994         destroy_inodecache();
2995 out1:
2996         exit_ext3_xattr();
2997         return err;
2998 }
2999
3000 static void __exit exit_ext3_fs(void)
3001 {
3002         unregister_filesystem(&ext3_fs_type);
3003         destroy_inodecache();
3004         exit_ext3_xattr();
3005 }
3006
3007 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
3008 MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
3009 MODULE_LICENSE("GPL");
3010 module_init(init_ext3_fs)
3011 module_exit(exit_ext3_fs)