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