SAFE public projects git trees. - safe/jmp/linux-2.6/blob - fs/ext3/super.c

   1 /*
   2  *  linux/fs/ext3/super.c
   3  *
   4  * Copyright (C) 1992, 1993, 1994, 1995
   5  * Remy Card (card@masi.ibp.fr)
   6  * Laboratoire MASI - Institut Blaise Pascal
   7  * Universite Pierre et Marie Curie (Paris VI)
   8  *
   9  *  from
  10  *
  11  *  linux/fs/minix/inode.c
  12  *
  13  *  Copyright (C) 1991, 1992  Linus Torvalds
  14  *
  15  *  Big-endian to little-endian byte-swapping/bitmaps by
  16  *        David S. Miller (davem@caip.rutgers.edu), 1995
  17  */
  18
  19 #include <linux/module.h>
  20 #include <linux/string.h>
  21 #include <linux/fs.h>
  22 #include <linux/time.h>
  23 #include <linux/jbd.h>
  24 #include <linux/ext3_fs.h>
  25 #include <linux/ext3_jbd.h>
  26 #include <linux/slab.h>
  27 #include <linux/init.h>
  28 #include <linux/blkdev.h>
  29 #include <linux/parser.h>
  30 #include <linux/smp_lock.h>
  31 #include <linux/buffer_head.h>
  32 #include <linux/exportfs.h>
  33 #include <linux/vfs.h>
  34 #include <linux/random.h>
  35 #include <linux/mount.h>
  36 #include <linux/namei.h>
  37 #include <linux/quotaops.h>
  38 #include <linux/seq_file.h>
  39 #include <linux/log2.h>
  40
  41 #include <asm/uaccess.h>
  42
  43 #include "xattr.h"
  44 #include "acl.h"
  45 #include "namei.h"
  46
  47 static int ext3_load_journal(struct super_block *, struct ext3_super_block *,
  48                              unsigned long journal_devnum);
  49 static int ext3_create_journal(struct super_block *, struct ext3_super_block *,
  50                                unsigned int);
  51 static void ext3_commit_super (struct super_block * sb,
  52                                struct ext3_super_block * es,
  53                                int sync);
  54 static void ext3_mark_recovery_complete(struct super_block * sb,
  55                                         struct ext3_super_block * es);
  56 static void ext3_clear_journal_err(struct super_block * sb,
  57                                    struct ext3_super_block * es);
  58 static int ext3_sync_fs(struct super_block *sb, int wait);
  59 static const char *ext3_decode_error(struct super_block * sb, int errno,
  60                                      char nbuf[16]);
  61 static int ext3_remount (struct super_block * sb, int * flags, char * data);
  62 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf);
  63 static void ext3_unlockfs(struct super_block *sb);
  64 static void ext3_write_super (struct super_block * sb);
  65 static void ext3_write_super_lockfs(struct super_block *sb);
  66
  67 /*
  68  * Wrappers for journal_start/end.
  69  *
  70  * The only special thing we need to do here is to make sure that all
  71  * journal_end calls result in the superblock being marked dirty, so
  72  * that sync() will call the filesystem's write_super callback if
  73  * appropriate.
  74  */
  75 handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks)
  76 {
  77         journal_t *journal;
  78
  79         if (sb->s_flags & MS_RDONLY)
  80                 return ERR_PTR(-EROFS);
  81
  82         /* Special case here: if the journal has aborted behind our
  83          * backs (eg. EIO in the commit thread), then we still need to
  84          * take the FS itself readonly cleanly. */
  85         journal = EXT3_SB(sb)->s_journal;
  86         if (is_journal_aborted(journal)) {
  87                 ext3_abort(sb, __FUNCTION__,
  88                            "Detected aborted journal");
  89                 return ERR_PTR(-EROFS);
  90         }
  91
  92         return journal_start(journal, nblocks);
  93 }
  94
  95 /*
  96  * The only special thing we need to do here is to make sure that all
  97  * journal_stop calls result in the superblock being marked dirty, so
  98  * that sync() will call the filesystem's write_super callback if
  99  * appropriate.
 100  */
 101 int __ext3_journal_stop(const char *where, handle_t *handle)
 102 {
 103         struct super_block *sb;
 104         int err;
 105         int rc;
 106
 107         sb = handle->h_transaction->t_journal->j_private;
 108         err = handle->h_err;
 109         rc = journal_stop(handle);
 110
 111         if (!err)
 112                 err = rc;
 113         if (err)
 114                 __ext3_std_error(sb, where, err);
 115         return err;
 116 }
 117
 118 void ext3_journal_abort_handle(const char *caller, const char *err_fn,
 119                 struct buffer_head *bh, handle_t *handle, int err)
 120 {
 121         char nbuf[16];
 122         const char *errstr = ext3_decode_error(NULL, err, nbuf);
 123
 124         if (bh)
 125                 BUFFER_TRACE(bh, "abort");
 126
 127         if (!handle->h_err)
 128                 handle->h_err = err;
 129
 130         if (is_handle_aborted(handle))
 131                 return;
 132
 133         printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
 134                caller, errstr, err_fn);
 135
 136         journal_abort_handle(handle);
 137 }
 138
 139 /* Deal with the reporting of failure conditions on a filesystem such as
 140  * inconsistencies detected or read IO failures.
 141  *
 142  * On ext2, we can store the error state of the filesystem in the
 143  * superblock.  That is not possible on ext3, because we may have other
 144  * write ordering constraints on the superblock which prevent us from
 145  * writing it out straight away; and given that the journal is about to
 146  * be aborted, we can't rely on the current, or future, transactions to
 147  * write out the superblock safely.
 148  *
 149  * We'll just use the journal_abort() error code to record an error in
 150  * the journal instead.  On recovery, the journal will compain about
 151  * that error until we've noted it down and cleared it.
 152  */
 153
 154 static void ext3_handle_error(struct super_block *sb)
 155 {
 156         struct ext3_super_block *es = EXT3_SB(sb)->s_es;
 157
 158         EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
 159         es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
 160
 161         if (sb->s_flags & MS_RDONLY)
 162                 return;
 163
 164         if (!test_opt (sb, ERRORS_CONT)) {
 165                 journal_t *journal = EXT3_SB(sb)->s_journal;
 166
 167                 EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
 168                 if (journal)
 169                         journal_abort(journal, -EIO);
 170         }
 171         if (test_opt (sb, ERRORS_RO)) {
 172                 printk (KERN_CRIT "Remounting filesystem read-only\n");
 173                 sb->s_flags |= MS_RDONLY;
 174         }
 175         ext3_commit_super(sb, es, 1);
 176         if (test_opt(sb, ERRORS_PANIC))
 177                 panic("EXT3-fs (device %s): panic forced after error\n",
 178                         sb->s_id);
 179 }
 180
 181 void ext3_error (struct super_block * sb, const char * function,
 182                  const char * fmt, ...)
 183 {
 184         va_list args;
 185
 186         va_start(args, fmt);
 187         printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
 188         vprintk(fmt, args);
 189         printk("\n");
 190         va_end(args);
 191
 192         ext3_handle_error(sb);
 193 }
 194
 195 static const char *ext3_decode_error(struct super_block * sb, int errno,
 196                                      char nbuf[16])
 197 {
 198         char *errstr = NULL;
 199
 200         switch (errno) {
 201         case -EIO:
 202                 errstr = "IO failure";
 203                 break;
 204         case -ENOMEM:
 205                 errstr = "Out of memory";
 206                 break;
 207         case -EROFS:
 208                 if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT)
 209                         errstr = "Journal has aborted";
 210                 else
 211                         errstr = "Readonly filesystem";
 212                 break;
 213         default:
 214                 /* If the caller passed in an extra buffer for unknown
 215                  * errors, textualise them now.  Else we just return
 216                  * NULL. */
 217                 if (nbuf) {
 218                         /* Check for truncated error codes... */
 219                         if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
 220                                 errstr = nbuf;
 221                 }
 222                 break;
 223         }
 224
 225         return errstr;
 226 }
 227
 228 /* __ext3_std_error decodes expected errors from journaling functions
 229  * automatically and invokes the appropriate error response.  */
 230
 231 void __ext3_std_error (struct super_block * sb, const char * function,
 232                        int errno)
 233 {
 234         char nbuf[16];
 235         const char *errstr;
 236
 237         /* Special case: if the error is EROFS, and we're not already
 238          * inside a transaction, then there's really no point in logging
 239          * an error. */
 240         if (errno == -EROFS && journal_current_handle() == NULL &&
 241             (sb->s_flags & MS_RDONLY))
 242                 return;
 243
 244         errstr = ext3_decode_error(sb, errno, nbuf);
 245         printk (KERN_CRIT "EXT3-fs error (device %s) in %s: %s\n",
 246                 sb->s_id, function, errstr);
 247
 248         ext3_handle_error(sb);
 249 }
 250
 251 /*
 252  * ext3_abort is a much stronger failure handler than ext3_error.  The
 253  * abort function may be used to deal with unrecoverable failures such
 254  * as journal IO errors or ENOMEM at a critical moment in log management.
 255  *
 256  * We unconditionally force the filesystem into an ABORT|READONLY state,
 257  * unless the error response on the fs has been set to panic in which
 258  * case we take the easy way out and panic immediately.
 259  */
 260
 261 void ext3_abort (struct super_block * sb, const char * function,
 262                  const char * fmt, ...)
 263 {
 264         va_list args;
 265
 266         printk (KERN_CRIT "ext3_abort called.\n");
 267
 268         va_start(args, fmt);
 269         printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
 270         vprintk(fmt, args);
 271         printk("\n");
 272         va_end(args);
 273
 274         if (test_opt(sb, ERRORS_PANIC))
 275                 panic("EXT3-fs panic from previous error\n");
 276
 277         if (sb->s_flags & MS_RDONLY)
 278                 return;
 279
 280         printk(KERN_CRIT "Remounting filesystem read-only\n");
 281         EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
 282         sb->s_flags |= MS_RDONLY;
 283         EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
 284         journal_abort(EXT3_SB(sb)->s_journal, -EIO);
 285 }
 286
 287 void ext3_warning (struct super_block * sb, const char * function,
 288                    const char * fmt, ...)
 289 {
 290         va_list args;
 291
 292         va_start(args, fmt);
 293         printk(KERN_WARNING "EXT3-fs warning (device %s): %s: ",
 294                sb->s_id, function);
 295         vprintk(fmt, args);
 296         printk("\n");
 297         va_end(args);
 298 }
 299
 300 void ext3_update_dynamic_rev(struct super_block *sb)
 301 {
 302         struct ext3_super_block *es = EXT3_SB(sb)->s_es;
 303
 304         if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
 305                 return;
 306
 307         ext3_warning(sb, __FUNCTION__,
 308                      "updating to rev %d because of new feature flag, "
 309                      "running e2fsck is recommended",
 310                      EXT3_DYNAMIC_REV);
 311
 312         es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO);
 313         es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE);
 314         es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV);
 315         /* leave es->s_feature_*compat flags alone */
 316         /* es->s_uuid will be set by e2fsck if empty */
 317
 318         /*
 319          * The rest of the superblock fields should be zero, and if not it
 320          * means they are likely already in use, so leave them alone.  We
 321          * can leave it up to e2fsck to clean up any inconsistencies there.
 322          */
 323 }
 324
 325 /*
 326  * Open the external journal device
 327  */
 328 static struct block_device *ext3_blkdev_get(dev_t dev)
 329 {
 330         struct block_device *bdev;
 331         char b[BDEVNAME_SIZE];
 332
 333         bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
 334         if (IS_ERR(bdev))
 335                 goto fail;
 336         return bdev;
 337
 338 fail:
 339         printk(KERN_ERR "EXT3: failed to open journal device %s: %ld\n",
 340                         __bdevname(dev, b), PTR_ERR(bdev));
 341         return NULL;
 342 }
 343
 344 /*
 345  * Release the journal device
 346  */
 347 static int ext3_blkdev_put(struct block_device *bdev)
 348 {
 349         bd_release(bdev);
 350         return blkdev_put(bdev);
 351 }
 352
 353 static int ext3_blkdev_remove(struct ext3_sb_info *sbi)
 354 {
 355         struct block_device *bdev;
 356         int ret = -ENODEV;
 357
 358         bdev = sbi->journal_bdev;
 359         if (bdev) {
 360                 ret = ext3_blkdev_put(bdev);
 361                 sbi->journal_bdev = NULL;
 362         }
 363         return ret;
 364 }
 365
 366 static inline struct inode *orphan_list_entry(struct list_head *l)
 367 {
 368         return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
 369 }
 370
 371 static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
 372 {
 373         struct list_head *l;
 374
 375         printk(KERN_ERR "sb orphan head is %d\n",
 376                le32_to_cpu(sbi->s_es->s_last_orphan));
 377
 378         printk(KERN_ERR "sb_info orphan list:\n");
 379         list_for_each(l, &sbi->s_orphan) {
 380                 struct inode *inode = orphan_list_entry(l);
 381                 printk(KERN_ERR "  "
 382                        "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
 383                        inode->i_sb->s_id, inode->i_ino, inode,
 384                        inode->i_mode, inode->i_nlink,
 385                        NEXT_ORPHAN(inode));
 386         }
 387 }
 388
 389 static void ext3_put_super (struct super_block * sb)
 390 {
 391         struct ext3_sb_info *sbi = EXT3_SB(sb);
 392         struct ext3_super_block *es = sbi->s_es;
 393         int i;
 394
 395         ext3_xattr_put_super(sb);
 396         journal_destroy(sbi->s_journal);
 397         if (!(sb->s_flags & MS_RDONLY)) {
 398                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
 399                 es->s_state = cpu_to_le16(sbi->s_mount_state);
 400                 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
 401                 mark_buffer_dirty(sbi->s_sbh);
 402                 ext3_commit_super(sb, es, 1);
 403         }
 404
 405         for (i = 0; i < sbi->s_gdb_count; i++)
 406                 brelse(sbi->s_group_desc[i]);
 407         kfree(sbi->s_group_desc);
 408         percpu_counter_destroy(&sbi->s_freeblocks_counter);
 409         percpu_counter_destroy(&sbi->s_freeinodes_counter);
 410         percpu_counter_destroy(&sbi->s_dirs_counter);
 411         brelse(sbi->s_sbh);
 412 #ifdef CONFIG_QUOTA
 413         for (i = 0; i < MAXQUOTAS; i++)
 414                 kfree(sbi->s_qf_names[i]);
 415 #endif
 416
 417         /* Debugging code just in case the in-memory inode orphan list
 418          * isn't empty.  The on-disk one can be non-empty if we've
 419          * detected an error and taken the fs readonly, but the
 420          * in-memory list had better be clean by this point. */
 421         if (!list_empty(&sbi->s_orphan))
 422                 dump_orphan_list(sb, sbi);
 423         J_ASSERT(list_empty(&sbi->s_orphan));
 424
 425         invalidate_bdev(sb->s_bdev);
 426         if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
 427                 /*
 428                  * Invalidate the journal device's buffers.  We don't want them
 429                  * floating about in memory - the physical journal device may
 430                  * hotswapped, and it breaks the `ro-after' testing code.
 431                  */
 432                 sync_blockdev(sbi->journal_bdev);
 433                 invalidate_bdev(sbi->journal_bdev);
 434                 ext3_blkdev_remove(sbi);
 435         }
 436         sb->s_fs_info = NULL;
 437         kfree(sbi);
 438         return;
 439 }
 440
 441 static struct kmem_cache *ext3_inode_cachep;
 442
 443 /*
 444  * Called inside transaction, so use GFP_NOFS
 445  */
 446 static struct inode *ext3_alloc_inode(struct super_block *sb)
 447 {
 448         struct ext3_inode_info *ei;
 449
 450         ei = kmem_cache_alloc(ext3_inode_cachep, GFP_NOFS);
 451         if (!ei)
 452                 return NULL;
 453 #ifdef CONFIG_EXT3_FS_POSIX_ACL
 454         ei->i_acl = EXT3_ACL_NOT_CACHED;
 455         ei->i_default_acl = EXT3_ACL_NOT_CACHED;
 456 #endif
 457         ei->i_block_alloc_info = NULL;
 458         ei->vfs_inode.i_version = 1;
 459         return &ei->vfs_inode;
 460 }
 461
 462 static void ext3_destroy_inode(struct inode *inode)
 463 {
 464         if (!list_empty(&(EXT3_I(inode)->i_orphan))) {
 465                 printk("EXT3 Inode %p: orphan list check failed!\n",
 466                         EXT3_I(inode));
 467                 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
 468                                 EXT3_I(inode), sizeof(struct ext3_inode_info),
 469                                 false);
 470                 dump_stack();
 471         }
 472         kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
 473 }
 474
 475 static void init_once(struct kmem_cache * cachep, void *foo)
 476 {
 477         struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
 478
 479         INIT_LIST_HEAD(&ei->i_orphan);
 480 #ifdef CONFIG_EXT3_FS_XATTR
 481         init_rwsem(&ei->xattr_sem);
 482 #endif
 483         mutex_init(&ei->truncate_mutex);
 484         inode_init_once(&ei->vfs_inode);
 485 }
 486
 487 static int init_inodecache(void)
 488 {
 489         ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
 490                                              sizeof(struct ext3_inode_info),
 491                                              0, (SLAB_RECLAIM_ACCOUNT|
 492                                                 SLAB_MEM_SPREAD),
 493                                              init_once);
 494         if (ext3_inode_cachep == NULL)
 495                 return -ENOMEM;
 496         return 0;
 497 }
 498
 499 static void destroy_inodecache(void)
 500 {
 501         kmem_cache_destroy(ext3_inode_cachep);
 502 }
 503
 504 static void ext3_clear_inode(struct inode *inode)
 505 {
 506         struct ext3_block_alloc_info *rsv = EXT3_I(inode)->i_block_alloc_info;
 507 #ifdef CONFIG_EXT3_FS_POSIX_ACL
 508         if (EXT3_I(inode)->i_acl &&
 509                         EXT3_I(inode)->i_acl != EXT3_ACL_NOT_CACHED) {
 510                 posix_acl_release(EXT3_I(inode)->i_acl);
 511                 EXT3_I(inode)->i_acl = EXT3_ACL_NOT_CACHED;
 512         }
 513         if (EXT3_I(inode)->i_default_acl &&
 514                         EXT3_I(inode)->i_default_acl != EXT3_ACL_NOT_CACHED) {
 515                 posix_acl_release(EXT3_I(inode)->i_default_acl);
 516                 EXT3_I(inode)->i_default_acl = EXT3_ACL_NOT_CACHED;
 517         }
 518 #endif
 519         ext3_discard_reservation(inode);
 520         EXT3_I(inode)->i_block_alloc_info = NULL;
 521         if (unlikely(rsv))
 522                 kfree(rsv);
 523 }
 524
 525 static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
 526 {
 527 #if defined(CONFIG_QUOTA)
 528         struct ext3_sb_info *sbi = EXT3_SB(sb);
 529
 530         if (sbi->s_jquota_fmt)
 531                 seq_printf(seq, ",jqfmt=%s",
 532                 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0");
 533
 534         if (sbi->s_qf_names[USRQUOTA])
 535                 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
 536
 537         if (sbi->s_qf_names[GRPQUOTA])
 538                 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
 539
 540         if (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA)
 541                 seq_puts(seq, ",usrquota");
 542
 543         if (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)
 544                 seq_puts(seq, ",grpquota");
 545 #endif
 546 }
 547
 548 /*
 549  * Show an option if
 550  *  - it's set to a non-default value OR
 551  *  - if the per-sb default is different from the global default
 552  */
 553 static int ext3_show_options(struct seq_file *seq, struct vfsmount *vfs)
 554 {
 555         struct super_block *sb = vfs->mnt_sb;
 556         struct ext3_sb_info *sbi = EXT3_SB(sb);
 557         struct ext3_super_block *es = sbi->s_es;
 558         unsigned long def_mount_opts;
 559
 560         def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
 561
 562         if (sbi->s_sb_block != 1)
 563                 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
 564         if (test_opt(sb, MINIX_DF))
 565                 seq_puts(seq, ",minixdf");
 566         if (test_opt(sb, GRPID))
 567                 seq_puts(seq, ",grpid");
 568         if (!test_opt(sb, GRPID) && (def_mount_opts & EXT3_DEFM_BSDGROUPS))
 569                 seq_puts(seq, ",nogrpid");
 570         if (sbi->s_resuid != EXT3_DEF_RESUID ||
 571             le16_to_cpu(es->s_def_resuid) != EXT3_DEF_RESUID) {
 572                 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
 573         }
 574         if (sbi->s_resgid != EXT3_DEF_RESGID ||
 575             le16_to_cpu(es->s_def_resgid) != EXT3_DEF_RESGID) {
 576                 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
 577         }
 578         if (test_opt(sb, ERRORS_RO)) {
 579                 int def_errors = le16_to_cpu(es->s_errors);
 580
 581                 if (def_errors == EXT3_ERRORS_PANIC ||
 582                     def_errors == EXT3_ERRORS_CONTINUE) {
 583                         seq_puts(seq, ",errors=remount-ro");
 584                 }
 585         }
 586         if (test_opt(sb, ERRORS_CONT))
 587                 seq_puts(seq, ",errors=continue");
 588         if (test_opt(sb, ERRORS_PANIC))
 589                 seq_puts(seq, ",errors=panic");
 590         if (test_opt(sb, NO_UID32))
 591                 seq_puts(seq, ",nouid32");
 592         if (test_opt(sb, DEBUG))
 593                 seq_puts(seq, ",debug");
 594         if (test_opt(sb, OLDALLOC))
 595                 seq_puts(seq, ",oldalloc");
 596 #ifdef CONFIG_EXT3_FS_XATTR
 597         if (test_opt(sb, XATTR_USER))
 598                 seq_puts(seq, ",user_xattr");
 599         if (!test_opt(sb, XATTR_USER) &&
 600             (def_mount_opts & EXT3_DEFM_XATTR_USER)) {
 601                 seq_puts(seq, ",nouser_xattr");
 602         }
 603 #endif
 604 #ifdef CONFIG_EXT3_FS_POSIX_ACL
 605         if (test_opt(sb, POSIX_ACL))
 606                 seq_puts(seq, ",acl");
 607         if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT3_DEFM_ACL))
 608                 seq_puts(seq, ",noacl");
 609 #endif
 610         if (!test_opt(sb, RESERVATION))
 611                 seq_puts(seq, ",noreservation");
 612         if (sbi->s_commit_interval) {
 613                 seq_printf(seq, ",commit=%u",
 614                            (unsigned) (sbi->s_commit_interval / HZ));
 615         }
 616         if (test_opt(sb, BARRIER))
 617                 seq_puts(seq, ",barrier=1");
 618         if (test_opt(sb, NOBH))
 619                 seq_puts(seq, ",nobh");
 620
 621         if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA)
 622                 seq_puts(seq, ",data=journal");
 623         else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA)
 624                 seq_puts(seq, ",data=ordered");
 625         else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)
 626                 seq_puts(seq, ",data=writeback");
 627
 628         ext3_show_quota_options(seq, sb);
 629
 630         return 0;
 631 }
 632
 633
 634 static struct inode *ext3_nfs_get_inode(struct super_block *sb,
 635                 u64 ino, u32 generation)
 636 {
 637         struct inode *inode;
 638
 639         if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO)
 640                 return ERR_PTR(-ESTALE);
 641         if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count))
 642                 return ERR_PTR(-ESTALE);
 643
 644         /* iget isn't really right if the inode is currently unallocated!!
 645          *
 646          * ext3_read_inode will return a bad_inode if the inode had been
 647          * deleted, so we should be safe.
 648          *
 649          * Currently we don't know the generation for parent directory, so
 650          * a generation of 0 means "accept any"
 651          */
 652         inode = ext3_iget(sb, ino);
 653         if (IS_ERR(inode))
 654                 return ERR_CAST(inode);
 655         if (generation && inode->i_generation != generation) {
 656                 iput(inode);
 657                 return ERR_PTR(-ESTALE);
 658         }
 659
 660         return inode;
 661 }
 662
 663 static struct dentry *ext3_fh_to_dentry(struct super_block *sb, struct fid *fid,
 664                 int fh_len, int fh_type)
 665 {
 666         return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
 667                                     ext3_nfs_get_inode);
 668 }
 669
 670 static struct dentry *ext3_fh_to_parent(struct super_block *sb, struct fid *fid,
 671                 int fh_len, int fh_type)
 672 {
 673         return generic_fh_to_parent(sb, fid, fh_len, fh_type,
 674                                     ext3_nfs_get_inode);
 675 }
 676
 677 #ifdef CONFIG_QUOTA
 678 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
 679 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
 680
 681 static int ext3_dquot_initialize(struct inode *inode, int type);
 682 static int ext3_dquot_drop(struct inode *inode);
 683 static int ext3_write_dquot(struct dquot *dquot);
 684 static int ext3_acquire_dquot(struct dquot *dquot);
 685 static int ext3_release_dquot(struct dquot *dquot);
 686 static int ext3_mark_dquot_dirty(struct dquot *dquot);
 687 static int ext3_write_info(struct super_block *sb, int type);
 688 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
 689                                 char *path, int remount);
 690 static int ext3_quota_on_mount(struct super_block *sb, int type);
 691 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
 692                                size_t len, loff_t off);
 693 static ssize_t ext3_quota_write(struct super_block *sb, int type,
 694                                 const char *data, size_t len, loff_t off);
 695
 696 static struct dquot_operations ext3_quota_operations = {
 697         .initialize     = ext3_dquot_initialize,
 698         .drop           = ext3_dquot_drop,
 699         .alloc_space    = dquot_alloc_space,
 700         .alloc_inode    = dquot_alloc_inode,
 701         .free_space     = dquot_free_space,
 702         .free_inode     = dquot_free_inode,
 703         .transfer       = dquot_transfer,
 704         .write_dquot    = ext3_write_dquot,
 705         .acquire_dquot  = ext3_acquire_dquot,
 706         .release_dquot  = ext3_release_dquot,
 707         .mark_dirty     = ext3_mark_dquot_dirty,
 708         .write_info     = ext3_write_info
 709 };
 710
 711 static struct quotactl_ops ext3_qctl_operations = {
 712         .quota_on       = ext3_quota_on,
 713         .quota_off      = vfs_quota_off,
 714         .quota_sync     = vfs_quota_sync,
 715         .get_info       = vfs_get_dqinfo,
 716         .set_info       = vfs_set_dqinfo,
 717         .get_dqblk      = vfs_get_dqblk,
 718         .set_dqblk      = vfs_set_dqblk
 719 };
 720 #endif
 721
 722 static const struct super_operations ext3_sops = {
 723         .alloc_inode    = ext3_alloc_inode,
 724         .destroy_inode  = ext3_destroy_inode,
 725         .write_inode    = ext3_write_inode,
 726         .dirty_inode    = ext3_dirty_inode,
 727         .delete_inode   = ext3_delete_inode,
 728         .put_super      = ext3_put_super,
 729         .write_super    = ext3_write_super,
 730         .sync_fs        = ext3_sync_fs,
 731         .write_super_lockfs = ext3_write_super_lockfs,
 732         .unlockfs       = ext3_unlockfs,
 733         .statfs         = ext3_statfs,
 734         .remount_fs     = ext3_remount,
 735         .clear_inode    = ext3_clear_inode,
 736         .show_options   = ext3_show_options,
 737 #ifdef CONFIG_QUOTA
 738         .quota_read     = ext3_quota_read,
 739         .quota_write    = ext3_quota_write,
 740 #endif
 741 };
 742
 743 static const struct export_operations ext3_export_ops = {
 744         .fh_to_dentry = ext3_fh_to_dentry,
 745         .fh_to_parent = ext3_fh_to_parent,
 746         .get_parent = ext3_get_parent,
 747 };
 748
 749 enum {
 750         Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
 751         Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
 752         Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
 753         Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
 754         Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
 755         Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
 756         Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
 757         Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
 758         Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
 759         Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
 760         Opt_grpquota
 761 };
 762
 763 static match_table_t tokens = {
 764         {Opt_bsd_df, "bsddf"},
 765         {Opt_minix_df, "minixdf"},
 766         {Opt_grpid, "grpid"},
 767         {Opt_grpid, "bsdgroups"},
 768         {Opt_nogrpid, "nogrpid"},
 769         {Opt_nogrpid, "sysvgroups"},
 770         {Opt_resgid, "resgid=%u"},
 771         {Opt_resuid, "resuid=%u"},
 772         {Opt_sb, "sb=%u"},
 773         {Opt_err_cont, "errors=continue"},
 774         {Opt_err_panic, "errors=panic"},
 775         {Opt_err_ro, "errors=remount-ro"},
 776         {Opt_nouid32, "nouid32"},
 777         {Opt_nocheck, "nocheck"},
 778         {Opt_nocheck, "check=none"},
 779         {Opt_debug, "debug"},
 780         {Opt_oldalloc, "oldalloc"},
 781         {Opt_orlov, "orlov"},
 782         {Opt_user_xattr, "user_xattr"},
 783         {Opt_nouser_xattr, "nouser_xattr"},
 784         {Opt_acl, "acl"},
 785         {Opt_noacl, "noacl"},
 786         {Opt_reservation, "reservation"},
 787         {Opt_noreservation, "noreservation"},
 788         {Opt_noload, "noload"},
 789         {Opt_nobh, "nobh"},
 790         {Opt_bh, "bh"},
 791         {Opt_commit, "commit=%u"},
 792         {Opt_journal_update, "journal=update"},
 793         {Opt_journal_inum, "journal=%u"},
 794         {Opt_journal_dev, "journal_dev=%u"},
 795         {Opt_abort, "abort"},
 796         {Opt_data_journal, "data=journal"},
 797         {Opt_data_ordered, "data=ordered"},
 798         {Opt_data_writeback, "data=writeback"},
 799         {Opt_offusrjquota, "usrjquota="},
 800         {Opt_usrjquota, "usrjquota=%s"},
 801         {Opt_offgrpjquota, "grpjquota="},
 802         {Opt_grpjquota, "grpjquota=%s"},
 803         {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
 804         {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
 805         {Opt_grpquota, "grpquota"},
 806         {Opt_noquota, "noquota"},
 807         {Opt_quota, "quota"},
 808         {Opt_usrquota, "usrquota"},
 809         {Opt_barrier, "barrier=%u"},
 810         {Opt_resize, "resize"},
 811         {Opt_err, NULL},
 812 };
 813
 814 static ext3_fsblk_t get_sb_block(void **data)
 815 {
 816         ext3_fsblk_t    sb_block;
 817         char            *options = (char *) *data;
 818
 819         if (!options || strncmp(options, "sb=", 3) != 0)
 820                 return 1;       /* Default location */
 821         options += 3;
 822         /*todo: use simple_strtoll with >32bit ext3 */
 823         sb_block = simple_strtoul(options, &options, 0);
 824         if (*options && *options != ',') {
 825                 printk("EXT3-fs: Invalid sb specification: %s\n",
 826                        (char *) *data);
 827                 return 1;
 828         }
 829         if (*options == ',')
 830                 options++;
 831         *data = (void *) options;
 832         return sb_block;
 833 }
 834
 835 static int parse_options (char *options, struct super_block *sb,
 836                           unsigned int *inum, unsigned long *journal_devnum,
 837                           ext3_fsblk_t *n_blocks_count, int is_remount)
 838 {
 839         struct ext3_sb_info *sbi = EXT3_SB(sb);
 840         char * p;
 841         substring_t args[MAX_OPT_ARGS];
 842         int data_opt = 0;
 843         int option;
 844 #ifdef CONFIG_QUOTA
 845         int qtype;
 846         char *qname;
 847 #endif
 848
 849         if (!options)
 850                 return 1;
 851
 852         while ((p = strsep (&options, ",")) != NULL) {
 853                 int token;
 854                 if (!*p)
 855                         continue;
 856
 857                 token = match_token(p, tokens, args);
 858                 switch (token) {
 859                 case Opt_bsd_df:
 860                         clear_opt (sbi->s_mount_opt, MINIX_DF);
 861                         break;
 862                 case Opt_minix_df:
 863                         set_opt (sbi->s_mount_opt, MINIX_DF);
 864                         break;
 865                 case Opt_grpid:
 866                         set_opt (sbi->s_mount_opt, GRPID);
 867                         break;
 868                 case Opt_nogrpid:
 869                         clear_opt (sbi->s_mount_opt, GRPID);
 870                         break;
 871                 case Opt_resuid:
 872                         if (match_int(&args[0], &option))
 873                                 return 0;
 874                         sbi->s_resuid = option;
 875                         break;
 876                 case Opt_resgid:
 877                         if (match_int(&args[0], &option))
 878                                 return 0;
 879                         sbi->s_resgid = option;
 880                         break;
 881                 case Opt_sb:
 882                         /* handled by get_sb_block() instead of here */
 883                         /* *sb_block = match_int(&args[0]); */
 884                         break;
 885                 case Opt_err_panic:
 886                         clear_opt (sbi->s_mount_opt, ERRORS_CONT);
 887                         clear_opt (sbi->s_mount_opt, ERRORS_RO);
 888                         set_opt (sbi->s_mount_opt, ERRORS_PANIC);
 889                         break;
 890                 case Opt_err_ro:
 891                         clear_opt (sbi->s_mount_opt, ERRORS_CONT);
 892                         clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
 893                         set_opt (sbi->s_mount_opt, ERRORS_RO);
 894                         break;
 895                 case Opt_err_cont:
 896                         clear_opt (sbi->s_mount_opt, ERRORS_RO);
 897                         clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
 898                         set_opt (sbi->s_mount_opt, ERRORS_CONT);
 899                         break;
 900                 case Opt_nouid32:
 901                         set_opt (sbi->s_mount_opt, NO_UID32);
 902                         break;
 903                 case Opt_nocheck:
 904                         clear_opt (sbi->s_mount_opt, CHECK);
 905                         break;
 906                 case Opt_debug:
 907                         set_opt (sbi->s_mount_opt, DEBUG);
 908                         break;
 909                 case Opt_oldalloc:
 910                         set_opt (sbi->s_mount_opt, OLDALLOC);
 911                         break;
 912                 case Opt_orlov:
 913                         clear_opt (sbi->s_mount_opt, OLDALLOC);
 914                         break;
 915 #ifdef CONFIG_EXT3_FS_XATTR
 916                 case Opt_user_xattr:
 917                         set_opt (sbi->s_mount_opt, XATTR_USER);
 918                         break;
 919                 case Opt_nouser_xattr:
 920                         clear_opt (sbi->s_mount_opt, XATTR_USER);
 921                         break;
 922 #else
 923                 case Opt_user_xattr:
 924                 case Opt_nouser_xattr:
 925                         printk("EXT3 (no)user_xattr options not supported\n");
 926                         break;
 927 #endif
 928 #ifdef CONFIG_EXT3_FS_POSIX_ACL
 929                 case Opt_acl:
 930                         set_opt(sbi->s_mount_opt, POSIX_ACL);
 931                         break;
 932                 case Opt_noacl:
 933                         clear_opt(sbi->s_mount_opt, POSIX_ACL);
 934                         break;
 935 #else
 936                 case Opt_acl:
 937                 case Opt_noacl:
 938                         printk("EXT3 (no)acl options not supported\n");
 939                         break;
 940 #endif
 941                 case Opt_reservation:
 942                         set_opt(sbi->s_mount_opt, RESERVATION);
 943                         break;
 944                 case Opt_noreservation:
 945                         clear_opt(sbi->s_mount_opt, RESERVATION);
 946                         break;
 947                 case Opt_journal_update:
 948                         /* @@@ FIXME */
 949                         /* Eventually we will want to be able to create
 950                            a journal file here.  For now, only allow the
 951                            user to specify an existing inode to be the
 952                            journal file. */
 953                         if (is_remount) {
 954                                 printk(KERN_ERR "EXT3-fs: cannot specify "
 955                                        "journal on remount\n");
 956                                 return 0;
 957                         }
 958                         set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
 959                         break;
 960                 case Opt_journal_inum:
 961                         if (is_remount) {
 962                                 printk(KERN_ERR "EXT3-fs: cannot specify "
 963                                        "journal on remount\n");
 964                                 return 0;
 965                         }
 966                         if (match_int(&args[0], &option))
 967                                 return 0;
 968                         *inum = option;
 969                         break;
 970                 case Opt_journal_dev:
 971                         if (is_remount) {
 972                                 printk(KERN_ERR "EXT3-fs: cannot specify "
 973                                        "journal on remount\n");
 974                                 return 0;
 975                         }
 976                         if (match_int(&args[0], &option))
 977                                 return 0;
 978                         *journal_devnum = option;
 979                         break;
 980                 case Opt_noload:
 981                         set_opt (sbi->s_mount_opt, NOLOAD);
 982                         break;
 983                 case Opt_commit:
 984                         if (match_int(&args[0], &option))
 985                                 return 0;
 986                         if (option < 0)
 987                                 return 0;
 988                         if (option == 0)
 989                                 option = JBD_DEFAULT_MAX_COMMIT_AGE;
 990                         sbi->s_commit_interval = HZ * option;
 991                         break;
 992                 case Opt_data_journal:
 993                         data_opt = EXT3_MOUNT_JOURNAL_DATA;
 994                         goto datacheck;
 995                 case Opt_data_ordered:
 996                         data_opt = EXT3_MOUNT_ORDERED_DATA;
 997                         goto datacheck;
 998                 case Opt_data_writeback:
 999                         data_opt = EXT3_MOUNT_WRITEBACK_DATA;
1000                 datacheck:
1001                         if (is_remount) {
1002                                 if ((sbi->s_mount_opt & EXT3_MOUNT_DATA_FLAGS)
1003                                                 != data_opt) {
1004                                         printk(KERN_ERR
1005                                                 "EXT3-fs: cannot change data "
1006                                                 "mode on remount\n");
1007                                         return 0;
1008                                 }
1009                         } else {
1010                                 sbi->s_mount_opt &= ~EXT3_MOUNT_DATA_FLAGS;
1011                                 sbi->s_mount_opt |= data_opt;
1012                         }
1013                         break;
1014 #ifdef CONFIG_QUOTA
1015                 case Opt_usrjquota:
1016                         qtype = USRQUOTA;
1017                         goto set_qf_name;
1018                 case Opt_grpjquota:
1019                         qtype = GRPQUOTA;
1020 set_qf_name:
1021                         if (sb_any_quota_enabled(sb)) {
1022                                 printk(KERN_ERR
1023                                         "EXT3-fs: Cannot change journalled "
1024                                         "quota options when quota turned on.\n");
1025                                 return 0;
1026                         }
1027                         qname = match_strdup(&args[0]);
1028                         if (!qname) {
1029                                 printk(KERN_ERR
1030                                         "EXT3-fs: not enough memory for "
1031                                         "storing quotafile name.\n");
1032                                 return 0;
1033                         }
1034                         if (sbi->s_qf_names[qtype] &&
1035                             strcmp(sbi->s_qf_names[qtype], qname)) {
1036                                 printk(KERN_ERR
1037                                         "EXT3-fs: %s quota file already "
1038                                         "specified.\n", QTYPE2NAME(qtype));
1039                                 kfree(qname);
1040                                 return 0;
1041                         }
1042                         sbi->s_qf_names[qtype] = qname;
1043                         if (strchr(sbi->s_qf_names[qtype], '/')) {
1044                                 printk(KERN_ERR
1045                                         "EXT3-fs: quotafile must be on "
1046                                         "filesystem root.\n");
1047                                 kfree(sbi->s_qf_names[qtype]);
1048                                 sbi->s_qf_names[qtype] = NULL;
1049                                 return 0;
1050                         }
1051                         set_opt(sbi->s_mount_opt, QUOTA);
1052                         break;
1053                 case Opt_offusrjquota:
1054                         qtype = USRQUOTA;
1055                         goto clear_qf_name;
1056                 case Opt_offgrpjquota:
1057                         qtype = GRPQUOTA;
1058 clear_qf_name:
1059                         if (sb_any_quota_enabled(sb)) {
1060                                 printk(KERN_ERR "EXT3-fs: Cannot change "
1061                                         "journalled quota options when "
1062                                         "quota turned on.\n");
1063                                 return 0;
1064                         }
1065                         /*
1066                          * The space will be released later when all options
1067                          * are confirmed to be correct
1068                          */
1069                         sbi->s_qf_names[qtype] = NULL;
1070                         break;
1071                 case Opt_jqfmt_vfsold:
1072                         sbi->s_jquota_fmt = QFMT_VFS_OLD;
1073                         break;
1074                 case Opt_jqfmt_vfsv0:
1075                         sbi->s_jquota_fmt = QFMT_VFS_V0;
1076                         break;
1077                 case Opt_quota:
1078                 case Opt_usrquota:
1079                         set_opt(sbi->s_mount_opt, QUOTA);
1080                         set_opt(sbi->s_mount_opt, USRQUOTA);
1081                         break;
1082                 case Opt_grpquota:
1083                         set_opt(sbi->s_mount_opt, QUOTA);
1084                         set_opt(sbi->s_mount_opt, GRPQUOTA);
1085                         break;
1086                 case Opt_noquota:
1087                         if (sb_any_quota_enabled(sb)) {
1088                                 printk(KERN_ERR "EXT3-fs: Cannot change quota "
1089                                         "options when quota turned on.\n");
1090                                 return 0;
1091                         }
1092                         clear_opt(sbi->s_mount_opt, QUOTA);
1093                         clear_opt(sbi->s_mount_opt, USRQUOTA);
1094                         clear_opt(sbi->s_mount_opt, GRPQUOTA);
1095                         break;
1096 #else
1097                 case Opt_quota:
1098                 case Opt_usrquota:
1099                 case Opt_grpquota:
1100                 case Opt_usrjquota:
1101                 case Opt_grpjquota:
1102                 case Opt_offusrjquota:
1103                 case Opt_offgrpjquota:
1104                 case Opt_jqfmt_vfsold:
1105                 case Opt_jqfmt_vfsv0:
1106                         printk(KERN_ERR
1107                                 "EXT3-fs: journalled quota options not "
1108                                 "supported.\n");
1109                         break;
1110                 case Opt_noquota:
1111                         break;
1112 #endif
1113                 case Opt_abort:
1114                         set_opt(sbi->s_mount_opt, ABORT);
1115                         break;
1116                 case Opt_barrier:
1117                         if (match_int(&args[0], &option))
1118                                 return 0;
1119                         if (option)
1120                                 set_opt(sbi->s_mount_opt, BARRIER);
1121                         else
1122                                 clear_opt(sbi->s_mount_opt, BARRIER);
1123                         break;
1124                 case Opt_ignore:
1125                         break;
1126                 case Opt_resize:
1127                         if (!is_remount) {
1128                                 printk("EXT3-fs: resize option only available "
1129                                         "for remount\n");
1130                                 return 0;
1131                         }
1132                         if (match_int(&args[0], &option) != 0)
1133                                 return 0;
1134                         *n_blocks_count = option;
1135                         break;
1136                 case Opt_nobh:
1137                         set_opt(sbi->s_mount_opt, NOBH);
1138                         break;
1139                 case Opt_bh:
1140                         clear_opt(sbi->s_mount_opt, NOBH);
1141                         break;
1142                 default:
1143                         printk (KERN_ERR
1144                                 "EXT3-fs: Unrecognized mount option \"%s\" "
1145                                 "or missing value\n", p);
1146                         return 0;
1147                 }
1148         }
1149 #ifdef CONFIG_QUOTA
1150         if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1151                 if ((sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA) &&
1152                      sbi->s_qf_names[USRQUOTA])
1153                         clear_opt(sbi->s_mount_opt, USRQUOTA);
1154
1155                 if ((sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA) &&
1156                      sbi->s_qf_names[GRPQUOTA])
1157                         clear_opt(sbi->s_mount_opt, GRPQUOTA);
1158
1159                 if ((sbi->s_qf_names[USRQUOTA] &&
1160                                 (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)) ||
1161                     (sbi->s_qf_names[GRPQUOTA] &&
1162                                 (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA))) {
1163                         printk(KERN_ERR "EXT3-fs: old and new quota "
1164                                         "format mixing.\n");
1165                         return 0;
1166                 }
1167
1168                 if (!sbi->s_jquota_fmt) {
1169                         printk(KERN_ERR "EXT3-fs: journalled quota format "
1170                                         "not specified.\n");
1171                         return 0;
1172                 }
1173         } else {
1174                 if (sbi->s_jquota_fmt) {
1175                         printk(KERN_ERR "EXT3-fs: journalled quota format "
1176                                         "specified with no journalling "
1177                                         "enabled.\n");
1178                         return 0;
1179                 }
1180         }
1181 #endif
1182         return 1;
1183 }
1184
1185 static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1186                             int read_only)
1187 {
1188         struct ext3_sb_info *sbi = EXT3_SB(sb);
1189         int res = 0;
1190
1191         if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
1192                 printk (KERN_ERR "EXT3-fs warning: revision level too high, "
1193                         "forcing read-only mode\n");
1194                 res = MS_RDONLY;
1195         }
1196         if (read_only)
1197                 return res;
1198         if (!(sbi->s_mount_state & EXT3_VALID_FS))
1199                 printk (KERN_WARNING "EXT3-fs warning: mounting unchecked fs, "
1200                         "running e2fsck is recommended\n");
1201         else if ((sbi->s_mount_state & EXT3_ERROR_FS))
1202                 printk (KERN_WARNING
1203                         "EXT3-fs warning: mounting fs with errors, "
1204                         "running e2fsck is recommended\n");
1205         else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1206                  le16_to_cpu(es->s_mnt_count) >=
1207                  (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1208                 printk (KERN_WARNING
1209                         "EXT3-fs warning: maximal mount count reached, "
1210                         "running e2fsck is recommended\n");
1211         else if (le32_to_cpu(es->s_checkinterval) &&
1212                 (le32_to_cpu(es->s_lastcheck) +
1213                         le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1214                 printk (KERN_WARNING
1215                         "EXT3-fs warning: checktime reached, "
1216                         "running e2fsck is recommended\n");
1217 #if 0
1218                 /* @@@ We _will_ want to clear the valid bit if we find
1219                    inconsistencies, to force a fsck at reboot.  But for
1220                    a plain journaled filesystem we can keep it set as
1221                    valid forever! :) */
1222         es->s_state &= cpu_to_le16(~EXT3_VALID_FS);
1223 #endif
1224         if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1225                 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
1226         le16_add_cpu(&es->s_mnt_count, 1);
1227         es->s_mtime = cpu_to_le32(get_seconds());
1228         ext3_update_dynamic_rev(sb);
1229         EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1230
1231         ext3_commit_super(sb, es, 1);
1232         if (test_opt(sb, DEBUG))
1233                 printk(KERN_INFO "[EXT3 FS bs=%lu, gc=%lu, "
1234                                 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1235                         sb->s_blocksize,
1236                         sbi->s_groups_count,
1237                         EXT3_BLOCKS_PER_GROUP(sb),
1238                         EXT3_INODES_PER_GROUP(sb),
1239                         sbi->s_mount_opt);
1240
1241         printk(KERN_INFO "EXT3 FS on %s, ", sb->s_id);
1242         if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1243                 char b[BDEVNAME_SIZE];
1244
1245                 printk("external journal on %s\n",
1246                         bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1247         } else {
1248                 printk("internal journal\n");
1249         }
1250         return res;
1251 }
1252
1253 /* Called at mount-time, super-block is locked */
1254 static int ext3_check_descriptors(struct super_block *sb)
1255 {
1256         struct ext3_sb_info *sbi = EXT3_SB(sb);
1257         ext3_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1258         ext3_fsblk_t last_block;
1259         int i;
1260
1261         ext3_debug ("Checking group descriptors");
1262
1263         for (i = 0; i < sbi->s_groups_count; i++) {
1264                 struct ext3_group_desc *gdp = ext3_get_group_desc(sb, i, NULL);
1265
1266                 if (i == sbi->s_groups_count - 1)
1267                         last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
1268                 else
1269                         last_block = first_block +
1270                                 (EXT3_BLOCKS_PER_GROUP(sb) - 1);
1271
1272                 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
1273                     le32_to_cpu(gdp->bg_block_bitmap) > last_block)
1274                 {
1275                         ext3_error (sb, "ext3_check_descriptors",
1276                                     "Block bitmap for group %d"
1277                                     " not in group (block %lu)!",
1278                                     i, (unsigned long)
1279                                         le32_to_cpu(gdp->bg_block_bitmap));
1280                         return 0;
1281                 }
1282                 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
1283                     le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
1284                 {
1285                         ext3_error (sb, "ext3_check_descriptors",
1286                                     "Inode bitmap for group %d"
1287                                     " not in group (block %lu)!",
1288                                     i, (unsigned long)
1289                                         le32_to_cpu(gdp->bg_inode_bitmap));
1290                         return 0;
1291                 }
1292                 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
1293                     le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
1294                     last_block)
1295                 {
1296                         ext3_error (sb, "ext3_check_descriptors",
1297                                     "Inode table for group %d"
1298                                     " not in group (block %lu)!",
1299                                     i, (unsigned long)
1300                                         le32_to_cpu(gdp->bg_inode_table));
1301                         return 0;
1302                 }
1303                 first_block += EXT3_BLOCKS_PER_GROUP(sb);
1304         }
1305
1306         sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1307         sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1308         return 1;
1309 }
1310
1311
1312 /* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1313  * the superblock) which were deleted from all directories, but held open by
1314  * a process at the time of a crash.  We walk the list and try to delete these
1315  * inodes at recovery time (only with a read-write filesystem).
1316  *
1317  * In order to keep the orphan inode chain consistent during traversal (in
1318  * case of crash during recovery), we link each inode into the superblock
1319  * orphan list_head and handle it the same way as an inode deletion during
1320  * normal operation (which journals the operations for us).
1321  *
1322  * We only do an iget() and an iput() on each inode, which is very safe if we
1323  * accidentally point at an in-use or already deleted inode.  The worst that
1324  * can happen in this case is that we get a "bit already cleared" message from
1325  * ext3_free_inode().  The only reason we would point at a wrong inode is if
1326  * e2fsck was run on this filesystem, and it must have already done the orphan
1327  * inode cleanup for us, so we can safely abort without any further action.
1328  */
1329 static void ext3_orphan_cleanup (struct super_block * sb,
1330                                  struct ext3_super_block * es)
1331 {
1332         unsigned int s_flags = sb->s_flags;
1333         int nr_orphans = 0, nr_truncates = 0;
1334 #ifdef CONFIG_QUOTA
1335         int i;
1336 #endif
1337         if (!es->s_last_orphan) {
1338                 jbd_debug(4, "no orphan inodes to clean up\n");
1339                 return;
1340         }
1341
1342         if (bdev_read_only(sb->s_bdev)) {
1343                 printk(KERN_ERR "EXT3-fs: write access "
1344                         "unavailable, skipping orphan cleanup.\n");
1345                 return;
1346         }
1347
1348         if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1349                 if (es->s_last_orphan)
1350                         jbd_debug(1, "Errors on filesystem, "
1351                                   "clearing orphan list.\n");
1352                 es->s_last_orphan = 0;
1353                 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1354                 return;
1355         }
1356
1357         if (s_flags & MS_RDONLY) {
1358                 printk(KERN_INFO "EXT3-fs: %s: orphan cleanup on readonly fs\n",
1359                        sb->s_id);
1360                 sb->s_flags &= ~MS_RDONLY;
1361         }
1362 #ifdef CONFIG_QUOTA
1363         /* Needed for iput() to work correctly and not trash data */
1364         sb->s_flags |= MS_ACTIVE;
1365         /* Turn on quotas so that they are updated correctly */
1366         for (i = 0; i < MAXQUOTAS; i++) {
1367                 if (EXT3_SB(sb)->s_qf_names[i]) {
1368                         int ret = ext3_quota_on_mount(sb, i);
1369                         if (ret < 0)
1370                                 printk(KERN_ERR
1371                                         "EXT3-fs: Cannot turn on journalled "
1372                                         "quota: error %d\n", ret);
1373                 }
1374         }
1375 #endif
1376
1377         while (es->s_last_orphan) {
1378                 struct inode *inode;
1379
1380                 inode = ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1381                 if (IS_ERR(inode)) {
1382                         es->s_last_orphan = 0;
1383                         break;
1384                 }
1385
1386                 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1387                 DQUOT_INIT(inode);
1388                 if (inode->i_nlink) {
1389                         printk(KERN_DEBUG
1390                                 "%s: truncating inode %lu to %Ld bytes\n",
1391                                 __FUNCTION__, inode->i_ino, inode->i_size);
1392                         jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1393                                   inode->i_ino, inode->i_size);
1394                         ext3_truncate(inode);
1395                         nr_truncates++;
1396                 } else {
1397                         printk(KERN_DEBUG
1398                                 "%s: deleting unreferenced inode %lu\n",
1399                                 __FUNCTION__, inode->i_ino);
1400                         jbd_debug(2, "deleting unreferenced inode %lu\n",
1401                                   inode->i_ino);
1402                         nr_orphans++;
1403                 }
1404                 iput(inode);  /* The delete magic happens here! */
1405         }
1406
1407 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1408
1409         if (nr_orphans)
1410                 printk(KERN_INFO "EXT3-fs: %s: %d orphan inode%s deleted\n",
1411                        sb->s_id, PLURAL(nr_orphans));
1412         if (nr_truncates)
1413                 printk(KERN_INFO "EXT3-fs: %s: %d truncate%s cleaned up\n",
1414                        sb->s_id, PLURAL(nr_truncates));
1415 #ifdef CONFIG_QUOTA
1416         /* Turn quotas off */
1417         for (i = 0; i < MAXQUOTAS; i++) {
1418                 if (sb_dqopt(sb)->files[i])
1419                         vfs_quota_off(sb, i, 0);
1420         }
1421 #endif
1422         sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1423 }
1424
1425 /*
1426  * Maximal file size.  There is a direct, and {,double-,triple-}indirect
1427  * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1428  * We need to be 1 filesystem block less than the 2^32 sector limit.
1429  */
1430 static loff_t ext3_max_size(int bits)
1431 {
1432         loff_t res = EXT3_NDIR_BLOCKS;
1433         int meta_blocks;
1434         loff_t upper_limit;
1435
1436         /* This is calculated to be the largest file size for a
1437          * dense, file such that the total number of
1438          * sectors in the file, including data and all indirect blocks,
1439          * does not exceed 2^32 -1
1440          * __u32 i_blocks representing the total number of
1441          * 512 bytes blocks of the file
1442          */
1443         upper_limit = (1LL << 32) - 1;
1444
1445         /* total blocks in file system block size */
1446         upper_limit >>= (bits - 9);
1447
1448
1449         /* indirect blocks */
1450         meta_blocks = 1;
1451         /* double indirect blocks */
1452         meta_blocks += 1 + (1LL << (bits-2));
1453         /* tripple indirect blocks */
1454         meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1455
1456         upper_limit -= meta_blocks;
1457         upper_limit <<= bits;
1458
1459         res += 1LL << (bits-2);
1460         res += 1LL << (2*(bits-2));
1461         res += 1LL << (3*(bits-2));
1462         res <<= bits;
1463         if (res > upper_limit)
1464                 res = upper_limit;
1465
1466         if (res > MAX_LFS_FILESIZE)
1467                 res = MAX_LFS_FILESIZE;
1468
1469         return res;
1470 }
1471
1472 static ext3_fsblk_t descriptor_loc(struct super_block *sb,
1473                                     ext3_fsblk_t logic_sb_block,
1474                                     int nr)
1475 {
1476         struct ext3_sb_info *sbi = EXT3_SB(sb);
1477         unsigned long bg, first_meta_bg;
1478         int has_super = 0;
1479
1480         first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1481
1482         if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1483             nr < first_meta_bg)
1484                 return (logic_sb_block + nr + 1);
1485         bg = sbi->s_desc_per_block * nr;
1486         if (ext3_bg_has_super(sb, bg))
1487                 has_super = 1;
1488         return (has_super + ext3_group_first_block_no(sb, bg));
1489 }
1490
1491
1492 static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1493 {
1494         struct buffer_head * bh;
1495         struct ext3_super_block *es = NULL;
1496         struct ext3_sb_info *sbi;
1497         ext3_fsblk_t block;
1498         ext3_fsblk_t sb_block = get_sb_block(&data);
1499         ext3_fsblk_t logic_sb_block;
1500         unsigned long offset = 0;
1501         unsigned int journal_inum = 0;
1502         unsigned long journal_devnum = 0;
1503         unsigned long def_mount_opts;
1504         struct inode *root;
1505         int blocksize;
1506         int hblock;
1507         int db_count;
1508         int i;
1509         int needs_recovery;
1510         int ret = -EINVAL;
1511         __le32 features;
1512         int err;
1513
1514         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1515         if (!sbi)
1516                 return -ENOMEM;
1517         sb->s_fs_info = sbi;
1518         sbi->s_mount_opt = 0;
1519         sbi->s_resuid = EXT3_DEF_RESUID;
1520         sbi->s_resgid = EXT3_DEF_RESGID;
1521         sbi->s_sb_block = sb_block;
1522
1523         unlock_kernel();
1524
1525         blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1526         if (!blocksize) {
1527                 printk(KERN_ERR "EXT3-fs: unable to set blocksize\n");
1528                 goto out_fail;
1529         }
1530
1531         /*
1532          * The ext3 superblock will not be buffer aligned for other than 1kB
1533          * block sizes.  We need to calculate the offset from buffer start.
1534          */
1535         if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1536                 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1537                 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1538         } else {
1539                 logic_sb_block = sb_block;
1540         }
1541
1542         if (!(bh = sb_bread(sb, logic_sb_block))) {
1543                 printk (KERN_ERR "EXT3-fs: unable to read superblock\n");
1544                 goto out_fail;
1545         }
1546         /*
1547          * Note: s_es must be initialized as soon as possible because
1548          *       some ext3 macro-instructions depend on its value
1549          */
1550         es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1551         sbi->s_es = es;
1552         sb->s_magic = le16_to_cpu(es->s_magic);
1553         if (sb->s_magic != EXT3_SUPER_MAGIC)
1554                 goto cantfind_ext3;
1555
1556         /* Set defaults before we parse the mount options */
1557         def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1558         if (def_mount_opts & EXT3_DEFM_DEBUG)
1559                 set_opt(sbi->s_mount_opt, DEBUG);
1560         if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1561                 set_opt(sbi->s_mount_opt, GRPID);
1562         if (def_mount_opts & EXT3_DEFM_UID16)
1563                 set_opt(sbi->s_mount_opt, NO_UID32);
1564 #ifdef CONFIG_EXT3_FS_XATTR
1565         if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1566                 set_opt(sbi->s_mount_opt, XATTR_USER);
1567 #endif
1568 #ifdef CONFIG_EXT3_FS_POSIX_ACL
1569         if (def_mount_opts & EXT3_DEFM_ACL)
1570                 set_opt(sbi->s_mount_opt, POSIX_ACL);
1571 #endif
1572         if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1573                 sbi->s_mount_opt |= EXT3_MOUNT_JOURNAL_DATA;
1574         else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1575                 sbi->s_mount_opt |= EXT3_MOUNT_ORDERED_DATA;
1576         else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1577                 sbi->s_mount_opt |= EXT3_MOUNT_WRITEBACK_DATA;
1578
1579         if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1580                 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1581         else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_CONTINUE)
1582                 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1583         else
1584                 set_opt(sbi->s_mount_opt, ERRORS_RO);
1585
1586         sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1587         sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1588
1589         set_opt(sbi->s_mount_opt, RESERVATION);
1590
1591         if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1592                             NULL, 0))
1593                 goto failed_mount;
1594
1595         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1596                 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1597
1598         if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1599             (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1600              EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1601              EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1602                 printk(KERN_WARNING
1603                        "EXT3-fs warning: feature flags set on rev 0 fs, "
1604                        "running e2fsck is recommended\n");
1605         /*
1606          * Check feature flags regardless of the revision level, since we
1607          * previously didn't change the revision level when setting the flags,
1608          * so there is a chance incompat flags are set on a rev 0 filesystem.
1609          */
1610         features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1611         if (features) {
1612                 printk(KERN_ERR "EXT3-fs: %s: couldn't mount because of "
1613                        "unsupported optional features (%x).\n",
1614                        sb->s_id, le32_to_cpu(features));
1615                 goto failed_mount;
1616         }
1617         features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1618         if (!(sb->s_flags & MS_RDONLY) && features) {
1619                 printk(KERN_ERR "EXT3-fs: %s: couldn't mount RDWR because of "
1620                        "unsupported optional features (%x).\n",
1621                        sb->s_id, le32_to_cpu(features));
1622                 goto failed_mount;
1623         }
1624         blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1625
1626         if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1627             blocksize > EXT3_MAX_BLOCK_SIZE) {
1628                 printk(KERN_ERR
1629                        "EXT3-fs: Unsupported filesystem blocksize %d on %s.\n",
1630                        blocksize, sb->s_id);
1631                 goto failed_mount;
1632         }
1633
1634         hblock = bdev_hardsect_size(sb->s_bdev);
1635         if (sb->s_blocksize != blocksize) {
1636                 /*
1637                  * Make sure the blocksize for the filesystem is larger
1638                  * than the hardware sectorsize for the machine.
1639                  */
1640                 if (blocksize < hblock) {
1641                         printk(KERN_ERR "EXT3-fs: blocksize %d too small for "
1642                                "device blocksize %d.\n", blocksize, hblock);
1643                         goto failed_mount;
1644                 }
1645
1646                 brelse (bh);
1647                 if (!sb_set_blocksize(sb, blocksize)) {
1648                         printk(KERN_ERR "EXT3-fs: bad blocksize %d.\n",
1649                                 blocksize);
1650                         goto out_fail;
1651                 }
1652                 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1653                 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1654                 bh = sb_bread(sb, logic_sb_block);
1655                 if (!bh) {
1656                         printk(KERN_ERR
1657                                "EXT3-fs: Can't read superblock on 2nd try.\n");
1658                         goto failed_mount;
1659                 }
1660                 es = (struct ext3_super_block *)(((char *)bh->b_data) + offset);
1661                 sbi->s_es = es;
1662                 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
1663                         printk (KERN_ERR
1664                                 "EXT3-fs: Magic mismatch, very weird !\n");
1665                         goto failed_mount;
1666                 }
1667         }
1668
1669         sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1670
1671         if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1672                 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1673                 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1674         } else {
1675                 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1676                 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1677                 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
1678                     (!is_power_of_2(sbi->s_inode_size)) ||
1679                     (sbi->s_inode_size > blocksize)) {
1680                         printk (KERN_ERR
1681                                 "EXT3-fs: unsupported inode size: %d\n",
1682                                 sbi->s_inode_size);
1683                         goto failed_mount;
1684                 }
1685         }
1686         sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1687                                    le32_to_cpu(es->s_log_frag_size);
1688         if (blocksize != sbi->s_frag_size) {
1689                 printk(KERN_ERR
1690                        "EXT3-fs: fragsize %lu != blocksize %u (unsupported)\n",
1691                        sbi->s_frag_size, blocksize);
1692                 goto failed_mount;
1693         }
1694         sbi->s_frags_per_block = 1;
1695         sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1696         sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1697         sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1698         if (EXT3_INODE_SIZE(sb) == 0 || EXT3_INODES_PER_GROUP(sb) == 0)
1699                 goto cantfind_ext3;
1700         sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1701         if (sbi->s_inodes_per_block == 0)
1702                 goto cantfind_ext3;
1703         sbi->s_itb_per_group = sbi->s_inodes_per_group /
1704                                         sbi->s_inodes_per_block;
1705         sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1706         sbi->s_sbh = bh;
1707         sbi->s_mount_state = le16_to_cpu(es->s_state);
1708         sbi->s_addr_per_block_bits = ilog2(EXT3_ADDR_PER_BLOCK(sb));
1709         sbi->s_desc_per_block_bits = ilog2(EXT3_DESC_PER_BLOCK(sb));
1710         for (i=0; i < 4; i++)
1711                 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1712         sbi->s_def_hash_version = es->s_def_hash_version;
1713
1714         if (sbi->s_blocks_per_group > blocksize * 8) {
1715                 printk (KERN_ERR
1716                         "EXT3-fs: #blocks per group too big: %lu\n",
1717                         sbi->s_blocks_per_group);
1718                 goto failed_mount;
1719         }
1720         if (sbi->s_frags_per_group > blocksize * 8) {
1721                 printk (KERN_ERR
1722                         "EXT3-fs: #fragments per group too big: %lu\n",
1723                         sbi->s_frags_per_group);
1724                 goto failed_mount;
1725         }
1726         if (sbi->s_inodes_per_group > blocksize * 8) {
1727                 printk (KERN_ERR
1728                         "EXT3-fs: #inodes per group too big: %lu\n",
1729                         sbi->s_inodes_per_group);
1730                 goto failed_mount;
1731         }
1732
1733         if (le32_to_cpu(es->s_blocks_count) >
1734                     (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
1735                 printk(KERN_ERR "EXT3-fs: filesystem on %s:"
1736                         " too large to mount safely\n", sb->s_id);
1737                 if (sizeof(sector_t) < 8)
1738                         printk(KERN_WARNING "EXT3-fs: CONFIG_LBD not "
1739                                         "enabled\n");
1740                 goto failed_mount;
1741         }
1742
1743         if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1744                 goto cantfind_ext3;
1745         sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1746                                le32_to_cpu(es->s_first_data_block) - 1)
1747                                        / EXT3_BLOCKS_PER_GROUP(sb)) + 1;
1748         db_count = (sbi->s_groups_count + EXT3_DESC_PER_BLOCK(sb) - 1) /
1749                    EXT3_DESC_PER_BLOCK(sb);
1750         sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1751                                     GFP_KERNEL);
1752         if (sbi->s_group_desc == NULL) {
1753                 printk (KERN_ERR "EXT3-fs: not enough memory\n");
1754                 goto failed_mount;
1755         }
1756
1757         bgl_lock_init(&sbi->s_blockgroup_lock);
1758
1759         for (i = 0; i < db_count; i++) {
1760                 block = descriptor_loc(sb, logic_sb_block, i);
1761                 sbi->s_group_desc[i] = sb_bread(sb, block);
1762                 if (!sbi->s_group_desc[i]) {
1763                         printk (KERN_ERR "EXT3-fs: "
1764                                 "can't read group descriptor %d\n", i);
1765                         db_count = i;
1766                         goto failed_mount2;
1767                 }
1768         }
1769         if (!ext3_check_descriptors (sb)) {
1770                 printk(KERN_ERR "EXT3-fs: group descriptors corrupted!\n");
1771                 goto failed_mount2;
1772         }
1773         sbi->s_gdb_count = db_count;
1774         get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1775         spin_lock_init(&sbi->s_next_gen_lock);
1776
1777         err = percpu_counter_init(&sbi->s_freeblocks_counter,
1778                         ext3_count_free_blocks(sb));
1779         if (!err) {
1780                 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1781                                 ext3_count_free_inodes(sb));
1782         }
1783         if (!err) {
1784                 err = percpu_counter_init(&sbi->s_dirs_counter,
1785                                 ext3_count_dirs(sb));
1786         }
1787         if (err) {
1788                 printk(KERN_ERR "EXT3-fs: insufficient memory\n");
1789                 goto failed_mount3;
1790         }
1791
1792         /* per fileystem reservation list head & lock */
1793         spin_lock_init(&sbi->s_rsv_window_lock);
1794         sbi->s_rsv_window_root = RB_ROOT;
1795         /* Add a single, static dummy reservation to the start of the
1796          * reservation window list --- it gives us a placeholder for
1797          * append-at-start-of-list which makes the allocation logic
1798          * _much_ simpler. */
1799         sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1800         sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1801         sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1802         sbi->s_rsv_window_head.rsv_goal_size = 0;
1803         ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1804
1805         /*
1806          * set up enough so that it can read an inode
1807          */
1808         sb->s_op = &ext3_sops;
1809         sb->s_export_op = &ext3_export_ops;
1810         sb->s_xattr = ext3_xattr_handlers;
1811 #ifdef CONFIG_QUOTA
1812         sb->s_qcop = &ext3_qctl_operations;
1813         sb->dq_op = &ext3_quota_operations;
1814 #endif
1815         INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1816
1817         sb->s_root = NULL;
1818
1819         needs_recovery = (es->s_last_orphan != 0 ||
1820                           EXT3_HAS_INCOMPAT_FEATURE(sb,
1821                                     EXT3_FEATURE_INCOMPAT_RECOVER));
1822
1823         /*
1824          * The first inode we look at is the journal inode.  Don't try
1825          * root first: it may be modified in the journal!
1826          */
1827         if (!test_opt(sb, NOLOAD) &&
1828             EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
1829                 if (ext3_load_journal(sb, es, journal_devnum))
1830                         goto failed_mount3;
1831         } else if (journal_inum) {
1832                 if (ext3_create_journal(sb, es, journal_inum))
1833                         goto failed_mount3;
1834         } else {
1835                 if (!silent)
1836                         printk (KERN_ERR
1837                                 "ext3: No journal on filesystem on %s\n",
1838                                 sb->s_id);
1839                 goto failed_mount3;
1840         }
1841
1842         /* We have now updated the journal if required, so we can
1843          * validate the data journaling mode. */
1844         switch (test_opt(sb, DATA_FLAGS)) {
1845         case 0:
1846                 /* No mode set, assume a default based on the journal
1847                    capabilities: ORDERED_DATA if the journal can
1848                    cope, else JOURNAL_DATA */
1849                 if (journal_check_available_features
1850                     (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
1851                         set_opt(sbi->s_mount_opt, ORDERED_DATA);
1852                 else
1853                         set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1854                 break;
1855
1856         case EXT3_MOUNT_ORDERED_DATA:
1857         case EXT3_MOUNT_WRITEBACK_DATA:
1858                 if (!journal_check_available_features
1859                     (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
1860                         printk(KERN_ERR "EXT3-fs: Journal does not support "
1861                                "requested data journaling mode\n");
1862                         goto failed_mount4;
1863                 }
1864         default:
1865                 break;
1866         }
1867
1868         if (test_opt(sb, NOBH)) {
1869                 if (!(test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)) {
1870                         printk(KERN_WARNING "EXT3-fs: Ignoring nobh option - "
1871                                 "its supported only with writeback mode\n");
1872                         clear_opt(sbi->s_mount_opt, NOBH);
1873                 }
1874         }
1875         /*
1876          * The journal_load will have done any necessary log recovery,
1877          * so we can safely mount the rest of the filesystem now.
1878          */
1879
1880         root = ext3_iget(sb, EXT3_ROOT_INO);
1881         if (IS_ERR(root)) {
1882                 printk(KERN_ERR "EXT3-fs: get root inode failed\n");
1883                 ret = PTR_ERR(root);
1884                 goto failed_mount4;
1885         }
1886         if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1887                 iput(root);
1888                 printk(KERN_ERR "EXT3-fs: corrupt root inode, run e2fsck\n");
1889                 goto failed_mount4;
1890         }
1891         sb->s_root = d_alloc_root(root);
1892         if (!sb->s_root) {
1893                 printk(KERN_ERR "EXT3-fs: get root dentry failed\n");
1894                 iput(root);
1895                 ret = -ENOMEM;
1896                 goto failed_mount4;
1897         }
1898
1899         ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
1900         /*
1901          * akpm: core read_super() calls in here with the superblock locked.
1902          * That deadlocks, because orphan cleanup needs to lock the superblock
1903          * in numerous places.  Here we just pop the lock - it's relatively
1904          * harmless, because we are now ready to accept write_super() requests,
1905          * and aviro says that's the only reason for hanging onto the
1906          * superblock lock.
1907          */
1908         EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
1909         ext3_orphan_cleanup(sb, es);
1910         EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
1911         if (needs_recovery)
1912                 printk (KERN_INFO "EXT3-fs: recovery complete.\n");
1913         ext3_mark_recovery_complete(sb, es);
1914         printk (KERN_INFO "EXT3-fs: mounted filesystem with %s data mode.\n",
1915                 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
1916                 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
1917                 "writeback");
1918
1919         lock_kernel();
1920         return 0;
1921
1922 cantfind_ext3:
1923         if (!silent)
1924                 printk(KERN_ERR "VFS: Can't find ext3 filesystem on dev %s.\n",
1925                        sb->s_id);
1926         goto failed_mount;
1927
1928 failed_mount4:
1929         journal_destroy(sbi->s_journal);
1930 failed_mount3:
1931         percpu_counter_destroy(&sbi->s_freeblocks_counter);
1932         percpu_counter_destroy(&sbi->s_freeinodes_counter);
1933         percpu_counter_destroy(&sbi->s_dirs_counter);
1934 failed_mount2:
1935         for (i = 0; i < db_count; i++)
1936                 brelse(sbi->s_group_desc[i]);
1937         kfree(sbi->s_group_desc);
1938 failed_mount:
1939 #ifdef CONFIG_QUOTA
1940         for (i = 0; i < MAXQUOTAS; i++)
1941                 kfree(sbi->s_qf_names[i]);
1942 #endif
1943         ext3_blkdev_remove(sbi);
1944         brelse(bh);
1945 out_fail:
1946         sb->s_fs_info = NULL;
1947         kfree(sbi);
1948         lock_kernel();
1949         return ret;
1950 }
1951
1952 /*
1953  * Setup any per-fs journal parameters now.  We'll do this both on
1954  * initial mount, once the journal has been initialised but before we've
1955  * done any recovery; and again on any subsequent remount.
1956  */
1957 static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
1958 {
1959         struct ext3_sb_info *sbi = EXT3_SB(sb);
1960
1961         if (sbi->s_commit_interval)
1962                 journal->j_commit_interval = sbi->s_commit_interval;
1963         /* We could also set up an ext3-specific default for the commit
1964          * interval here, but for now we'll just fall back to the jbd
1965          * default. */
1966
1967         spin_lock(&journal->j_state_lock);
1968         if (test_opt(sb, BARRIER))
1969                 journal->j_flags |= JFS_BARRIER;
1970         else
1971                 journal->j_flags &= ~JFS_BARRIER;
1972         spin_unlock(&journal->j_state_lock);
1973 }
1974
1975 static journal_t *ext3_get_journal(struct super_block *sb,
1976                                    unsigned int journal_inum)
1977 {
1978         struct inode *journal_inode;
1979         journal_t *journal;
1980
1981         /* First, test for the existence of a valid inode on disk.  Bad
1982          * things happen if we iget() an unused inode, as the subsequent
1983          * iput() will try to delete it. */
1984
1985         journal_inode = ext3_iget(sb, journal_inum);
1986         if (IS_ERR(journal_inode)) {
1987                 printk(KERN_ERR "EXT3-fs: no journal found.\n");
1988                 return NULL;
1989         }
1990         if (!journal_inode->i_nlink) {
1991                 make_bad_inode(journal_inode);
1992                 iput(journal_inode);
1993                 printk(KERN_ERR "EXT3-fs: journal inode is deleted.\n");
1994                 return NULL;
1995         }
1996
1997         jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
1998                   journal_inode, journal_inode->i_size);
1999         if (!S_ISREG(journal_inode->i_mode)) {
2000                 printk(KERN_ERR "EXT3-fs: invalid journal inode.\n");
2001                 iput(journal_inode);
2002                 return NULL;
2003         }
2004
2005         journal = journal_init_inode(journal_inode);
2006         if (!journal) {
2007                 printk(KERN_ERR "EXT3-fs: Could not load journal inode\n");
2008                 iput(journal_inode);
2009                 return NULL;
2010         }
2011         journal->j_private = sb;
2012         ext3_init_journal_params(sb, journal);
2013         return journal;
2014 }
2015
2016 static journal_t *ext3_get_dev_journal(struct super_block *sb,
2017                                        dev_t j_dev)
2018 {
2019         struct buffer_head * bh;
2020         journal_t *journal;
2021         ext3_fsblk_t start;
2022         ext3_fsblk_t len;
2023         int hblock, blocksize;
2024         ext3_fsblk_t sb_block;
2025         unsigned long offset;
2026         struct ext3_super_block * es;
2027         struct block_device *bdev;
2028
2029         bdev = ext3_blkdev_get(j_dev);
2030         if (bdev == NULL)
2031                 return NULL;
2032
2033         if (bd_claim(bdev, sb)) {
2034                 printk(KERN_ERR
2035                         "EXT3: failed to claim external journal device.\n");
2036                 blkdev_put(bdev);
2037                 return NULL;
2038         }
2039
2040         blocksize = sb->s_blocksize;
2041         hblock = bdev_hardsect_size(bdev);
2042         if (blocksize < hblock) {
2043                 printk(KERN_ERR
2044                         "EXT3-fs: blocksize too small for journal device.\n");
2045                 goto out_bdev;
2046         }
2047
2048         sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
2049         offset = EXT3_MIN_BLOCK_SIZE % blocksize;
2050         set_blocksize(bdev, blocksize);
2051         if (!(bh = __bread(bdev, sb_block, blocksize))) {
2052                 printk(KERN_ERR "EXT3-fs: couldn't read superblock of "
2053                        "external journal\n");
2054                 goto out_bdev;
2055         }
2056
2057         es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
2058         if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
2059             !(le32_to_cpu(es->s_feature_incompat) &
2060               EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2061                 printk(KERN_ERR "EXT3-fs: external journal has "
2062                                         "bad superblock\n");
2063                 brelse(bh);
2064                 goto out_bdev;
2065         }
2066
2067         if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2068                 printk(KERN_ERR "EXT3-fs: journal UUID does not match\n");
2069                 brelse(bh);
2070                 goto out_bdev;
2071         }
2072
2073         len = le32_to_cpu(es->s_blocks_count);
2074         start = sb_block + 1;
2075         brelse(bh);     /* we're done with the superblock */
2076
2077         journal = journal_init_dev(bdev, sb->s_bdev,
2078                                         start, len, blocksize);
2079         if (!journal) {
2080                 printk(KERN_ERR "EXT3-fs: failed to create device journal\n");
2081                 goto out_bdev;
2082         }
2083         journal->j_private = sb;
2084         ll_rw_block(READ, 1, &journal->j_sb_buffer);
2085         wait_on_buffer(journal->j_sb_buffer);
2086         if (!buffer_uptodate(journal->j_sb_buffer)) {
2087                 printk(KERN_ERR "EXT3-fs: I/O error on journal device\n");
2088                 goto out_journal;
2089         }
2090         if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
2091                 printk(KERN_ERR "EXT3-fs: External journal has more than one "
2092                                         "user (unsupported) - %d\n",
2093                         be32_to_cpu(journal->j_superblock->s_nr_users));
2094                 goto out_journal;
2095         }
2096         EXT3_SB(sb)->journal_bdev = bdev;
2097         ext3_init_journal_params(sb, journal);
2098         return journal;
2099 out_journal:
2100         journal_destroy(journal);
2101 out_bdev:
2102         ext3_blkdev_put(bdev);
2103         return NULL;
2104 }
2105
2106 static int ext3_load_journal(struct super_block *sb,
2107                              struct ext3_super_block *es,
2108                              unsigned long journal_devnum)
2109 {
2110         journal_t *journal;
2111         unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2112         dev_t journal_dev;
2113         int err = 0;
2114         int really_read_only;
2115
2116         if (journal_devnum &&
2117             journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2118                 printk(KERN_INFO "EXT3-fs: external journal device major/minor "
2119                         "numbers have changed\n");
2120                 journal_dev = new_decode_dev(journal_devnum);
2121         } else
2122                 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2123
2124         really_read_only = bdev_read_only(sb->s_bdev);
2125
2126         /*
2127          * Are we loading a blank journal or performing recovery after a
2128          * crash?  For recovery, we need to check in advance whether we
2129          * can get read-write access to the device.
2130          */
2131
2132         if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
2133                 if (sb->s_flags & MS_RDONLY) {
2134                         printk(KERN_INFO "EXT3-fs: INFO: recovery "
2135                                         "required on readonly filesystem.\n");
2136                         if (really_read_only) {
2137                                 printk(KERN_ERR "EXT3-fs: write access "
2138                                         "unavailable, cannot proceed.\n");
2139                                 return -EROFS;
2140                         }
2141                         printk (KERN_INFO "EXT3-fs: write access will "
2142                                         "be enabled during recovery.\n");
2143                 }
2144         }
2145
2146         if (journal_inum && journal_dev) {
2147                 printk(KERN_ERR "EXT3-fs: filesystem has both journal "
2148                        "and inode journals!\n");
2149                 return -EINVAL;
2150         }
2151
2152         if (journal_inum) {
2153                 if (!(journal = ext3_get_journal(sb, journal_inum)))
2154                         return -EINVAL;
2155         } else {
2156                 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
2157                         return -EINVAL;
2158         }
2159
2160         if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2161                 err = journal_update_format(journal);
2162                 if (err)  {
2163                         printk(KERN_ERR "EXT3-fs: error updating journal.\n");
2164                         journal_destroy(journal);
2165                         return err;
2166                 }
2167         }
2168
2169         if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
2170                 err = journal_wipe(journal, !really_read_only);
2171         if (!err)
2172                 err = journal_load(journal);
2173
2174         if (err) {
2175                 printk(KERN_ERR "EXT3-fs: error loading journal.\n");
2176                 journal_destroy(journal);
2177                 return err;
2178         }
2179
2180         EXT3_SB(sb)->s_journal = journal;
2181         ext3_clear_journal_err(sb, es);
2182
2183         if (journal_devnum &&
2184             journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2185                 es->s_journal_dev = cpu_to_le32(journal_devnum);
2186                 sb->s_dirt = 1;
2187
2188                 /* Make sure we flush the recovery flag to disk. */
2189                 ext3_commit_super(sb, es, 1);
2190         }
2191
2192         return 0;
2193 }
2194
2195 static int ext3_create_journal(struct super_block * sb,
2196                                struct ext3_super_block * es,
2197                                unsigned int journal_inum)
2198 {
2199         journal_t *journal;
2200         int err;
2201
2202         if (sb->s_flags & MS_RDONLY) {
2203                 printk(KERN_ERR "EXT3-fs: readonly filesystem when trying to "
2204                                 "create journal.\n");
2205                 return -EROFS;
2206         }
2207
2208         journal = ext3_get_journal(sb, journal_inum);
2209         if (!journal)
2210                 return -EINVAL;
2211
2212         printk(KERN_INFO "EXT3-fs: creating new journal on inode %u\n",
2213                journal_inum);
2214
2215         err = journal_create(journal);
2216         if (err) {
2217                 printk(KERN_ERR "EXT3-fs: error creating journal.\n");
2218                 journal_destroy(journal);
2219                 return -EIO;
2220         }
2221
2222         EXT3_SB(sb)->s_journal = journal;
2223
2224         ext3_update_dynamic_rev(sb);
2225         EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2226         EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2227
2228         es->s_journal_inum = cpu_to_le32(journal_inum);
2229         sb->s_dirt = 1;
2230
2231         /* Make sure we flush the recovery flag to disk. */
2232         ext3_commit_super(sb, es, 1);
2233
2234         return 0;
2235 }
2236
2237 static void ext3_commit_super (struct super_block * sb,
2238                                struct ext3_super_block * es,
2239                                int sync)
2240 {
2241         struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
2242
2243         if (!sbh)
2244                 return;
2245         es->s_wtime = cpu_to_le32(get_seconds());
2246         es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2247         es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2248         BUFFER_TRACE(sbh, "marking dirty");
2249         mark_buffer_dirty(sbh);
2250         if (sync)
2251                 sync_dirty_buffer(sbh);
2252 }
2253
2254
2255 /*
2256  * Have we just finished recovery?  If so, and if we are mounting (or
2257  * remounting) the filesystem readonly, then we will end up with a
2258  * consistent fs on disk.  Record that fact.
2259  */
2260 static void ext3_mark_recovery_complete(struct super_block * sb,
2261                                         struct ext3_super_block * es)
2262 {
2263         journal_t *journal = EXT3_SB(sb)->s_journal;
2264
2265         journal_lock_updates(journal);
2266         journal_flush(journal);
2267         lock_super(sb);
2268         if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2269             sb->s_flags & MS_RDONLY) {
2270                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2271                 sb->s_dirt = 0;
2272                 ext3_commit_super(sb, es, 1);
2273         }
2274         unlock_super(sb);
2275         journal_unlock_updates(journal);
2276 }
2277
2278 /*
2279  * If we are mounting (or read-write remounting) a filesystem whose journal
2280  * has recorded an error from a previous lifetime, move that error to the
2281  * main filesystem now.
2282  */
2283 static void ext3_clear_journal_err(struct super_block * sb,
2284                                    struct ext3_super_block * es)
2285 {
2286         journal_t *journal;
2287         int j_errno;
2288         const char *errstr;
2289
2290         journal = EXT3_SB(sb)->s_journal;
2291
2292         /*
2293          * Now check for any error status which may have been recorded in the
2294          * journal by a prior ext3_error() or ext3_abort()
2295          */
2296
2297         j_errno = journal_errno(journal);
2298         if (j_errno) {
2299                 char nbuf[16];
2300
2301                 errstr = ext3_decode_error(sb, j_errno, nbuf);
2302                 ext3_warning(sb, __FUNCTION__, "Filesystem error recorded "
2303                              "from previous mount: %s", errstr);
2304                 ext3_warning(sb, __FUNCTION__, "Marking fs in need of "
2305                              "filesystem check.");
2306
2307                 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2308                 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2309                 ext3_commit_super (sb, es, 1);
2310
2311                 journal_clear_err(journal);
2312         }
2313 }
2314
2315 /*
2316  * Force the running and committing transactions to commit,
2317  * and wait on the commit.
2318  */
2319 int ext3_force_commit(struct super_block *sb)
2320 {
2321         journal_t *journal;
2322         int ret;
2323
2324         if (sb->s_flags & MS_RDONLY)
2325                 return 0;
2326
2327         journal = EXT3_SB(sb)->s_journal;
2328         sb->s_dirt = 0;
2329         ret = ext3_journal_force_commit(journal);
2330         return ret;
2331 }
2332
2333 /*
2334  * Ext3 always journals updates to the superblock itself, so we don't
2335  * have to propagate any other updates to the superblock on disk at this
2336  * point.  Just start an async writeback to get the buffers on their way
2337  * to the disk.
2338  *
2339  * This implicitly triggers the writebehind on sync().
2340  */
2341
2342 static void ext3_write_super (struct super_block * sb)
2343 {
2344         if (mutex_trylock(&sb->s_lock) != 0)
2345                 BUG();
2346         sb->s_dirt = 0;
2347 }
2348
2349 static int ext3_sync_fs(struct super_block *sb, int wait)
2350 {
2351         tid_t target;
2352
2353         sb->s_dirt = 0;
2354         if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2355                 if (wait)
2356                         log_wait_commit(EXT3_SB(sb)->s_journal, target);
2357         }
2358         return 0;
2359 }
2360
2361 /*
2362  * LVM calls this function before a (read-only) snapshot is created.  This
2363  * gives us a chance to flush the journal completely and mark the fs clean.
2364  */
2365 static void ext3_write_super_lockfs(struct super_block *sb)
2366 {
2367         sb->s_dirt = 0;
2368
2369         if (!(sb->s_flags & MS_RDONLY)) {
2370                 journal_t *journal = EXT3_SB(sb)->s_journal;
2371
2372                 /* Now we set up the journal barrier. */
2373                 journal_lock_updates(journal);
2374                 journal_flush(journal);
2375
2376                 /* Journal blocked and flushed, clear needs_recovery flag. */
2377                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2378                 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2379         }
2380 }
2381
2382 /*
2383  * Called by LVM after the snapshot is done.  We need to reset the RECOVER
2384  * flag here, even though the filesystem is not technically dirty yet.
2385  */
2386 static void ext3_unlockfs(struct super_block *sb)
2387 {
2388         if (!(sb->s_flags & MS_RDONLY)) {
2389                 lock_super(sb);
2390                 /* Reser the needs_recovery flag before the fs is unlocked. */
2391                 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2392                 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2393                 unlock_super(sb);
2394                 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2395         }
2396 }
2397
2398 static int ext3_remount (struct super_block * sb, int * flags, char * data)
2399 {
2400         struct ext3_super_block * es;
2401         struct ext3_sb_info *sbi = EXT3_SB(sb);
2402         ext3_fsblk_t n_blocks_count = 0;
2403         unsigned long old_sb_flags;
2404         struct ext3_mount_options old_opts;
2405         int err;
2406 #ifdef CONFIG_QUOTA
2407         int i;
2408 #endif
2409
2410         /* Store the original options */
2411         old_sb_flags = sb->s_flags;
2412         old_opts.s_mount_opt = sbi->s_mount_opt;
2413         old_opts.s_resuid = sbi->s_resuid;
2414         old_opts.s_resgid = sbi->s_resgid;
2415         old_opts.s_commit_interval = sbi->s_commit_interval;
2416 #ifdef CONFIG_QUOTA
2417         old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2418         for (i = 0; i < MAXQUOTAS; i++)
2419                 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2420 #endif
2421
2422         /*
2423          * Allow the "check" option to be passed as a remount option.
2424          */
2425         if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2426                 err = -EINVAL;
2427                 goto restore_opts;
2428         }
2429
2430         if (sbi->s_mount_opt & EXT3_MOUNT_ABORT)
2431                 ext3_abort(sb, __FUNCTION__, "Abort forced by user");
2432
2433         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2434                 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2435
2436         es = sbi->s_es;
2437
2438         ext3_init_journal_params(sb, sbi->s_journal);
2439
2440         if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2441                 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
2442                 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT) {
2443                         err = -EROFS;
2444                         goto restore_opts;
2445                 }
2446
2447                 if (*flags & MS_RDONLY) {
2448                         /*
2449                          * First of all, the unconditional stuff we have to do
2450                          * to disable replay of the journal when we next remount
2451                          */
2452                         sb->s_flags |= MS_RDONLY;
2453
2454                         /*
2455                          * OK, test if we are remounting a valid rw partition
2456                          * readonly, and if so set the rdonly flag and then
2457                          * mark the partition as valid again.
2458                          */
2459                         if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2460                             (sbi->s_mount_state & EXT3_VALID_FS))
2461                                 es->s_state = cpu_to_le16(sbi->s_mount_state);
2462
2463                         /*
2464                          * We have to unlock super so that we can wait for
2465                          * transactions.
2466                          */
2467                         unlock_super(sb);
2468                         ext3_mark_recovery_complete(sb, es);
2469                         lock_super(sb);
2470                 } else {
2471                         __le32 ret;
2472                         if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2473                                         ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2474                                 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2475                                        "remount RDWR because of unsupported "
2476                                        "optional features (%x).\n",
2477                                        sb->s_id, le32_to_cpu(ret));
2478                                 err = -EROFS;
2479                                 goto restore_opts;
2480                         }
2481
2482                         /*
2483                          * If we have an unprocessed orphan list hanging
2484                          * around from a previously readonly bdev mount,
2485                          * require a full umount/remount for now.
2486                          */
2487                         if (es->s_last_orphan) {
2488                                 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2489                                        "remount RDWR because of unprocessed "
2490                                        "orphan inode list.  Please "
2491                                        "umount/remount instead.\n",
2492                                        sb->s_id);
2493                                 err = -EINVAL;
2494                                 goto restore_opts;
2495                         }
2496
2497                         /*
2498                          * Mounting a RDONLY partition read-write, so reread
2499                          * and store the current valid flag.  (It may have
2500                          * been changed by e2fsck since we originally mounted
2501                          * the partition.)
2502                          */
2503                         ext3_clear_journal_err(sb, es);
2504                         sbi->s_mount_state = le16_to_cpu(es->s_state);
2505                         if ((err = ext3_group_extend(sb, es, n_blocks_count)))
2506                                 goto restore_opts;
2507                         if (!ext3_setup_super (sb, es, 0))
2508                                 sb->s_flags &= ~MS_RDONLY;
2509                 }
2510         }
2511 #ifdef CONFIG_QUOTA
2512         /* Release old quota file names */
2513         for (i = 0; i < MAXQUOTAS; i++)
2514                 if (old_opts.s_qf_names[i] &&
2515                     old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2516                         kfree(old_opts.s_qf_names[i]);
2517 #endif
2518         return 0;
2519 restore_opts:
2520         sb->s_flags = old_sb_flags;
2521         sbi->s_mount_opt = old_opts.s_mount_opt;
2522         sbi->s_resuid = old_opts.s_resuid;
2523         sbi->s_resgid = old_opts.s_resgid;
2524         sbi->s_commit_interval = old_opts.s_commit_interval;
2525 #ifdef CONFIG_QUOTA
2526         sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2527         for (i = 0; i < MAXQUOTAS; i++) {
2528                 if (sbi->s_qf_names[i] &&
2529                     old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2530                         kfree(sbi->s_qf_names[i]);
2531                 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2532         }
2533 #endif
2534         return err;
2535 }
2536
2537 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
2538 {
2539         struct super_block *sb = dentry->d_sb;
2540         struct ext3_sb_info *sbi = EXT3_SB(sb);
2541         struct ext3_super_block *es = sbi->s_es;
2542         u64 fsid;
2543
2544         if (test_opt(sb, MINIX_DF)) {
2545                 sbi->s_overhead_last = 0;
2546         } else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
2547                 unsigned long ngroups = sbi->s_groups_count, i;
2548                 ext3_fsblk_t overhead = 0;
2549                 smp_rmb();
2550
2551                 /*
2552                  * Compute the overhead (FS structures).  This is constant
2553                  * for a given filesystem unless the number of block groups
2554                  * changes so we cache the previous value until it does.
2555                  */
2556
2557                 /*
2558                  * All of the blocks before first_data_block are
2559                  * overhead
2560                  */
2561                 overhead = le32_to_cpu(es->s_first_data_block);
2562
2563                 /*
2564                  * Add the overhead attributed to the superblock and
2565                  * block group descriptors.  If the sparse superblocks
2566                  * feature is turned on, then not all groups have this.
2567                  */
2568                 for (i = 0; i < ngroups; i++) {
2569                         overhead += ext3_bg_has_super(sb, i) +
2570                                 ext3_bg_num_gdb(sb, i);
2571                         cond_resched();
2572                 }
2573
2574                 /*
2575                  * Every block group has an inode bitmap, a block
2576                  * bitmap, and an inode table.
2577                  */
2578                 overhead += ngroups * (2 + sbi->s_itb_per_group);
2579                 sbi->s_overhead_last = overhead;
2580                 smp_wmb();
2581                 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
2582         }
2583
2584         buf->f_type = EXT3_SUPER_MAGIC;
2585         buf->f_bsize = sb->s_blocksize;
2586         buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
2587         buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
2588         es->s_free_blocks_count = cpu_to_le32(buf->f_bfree);
2589         buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2590         if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2591                 buf->f_bavail = 0;
2592         buf->f_files = le32_to_cpu(es->s_inodes_count);
2593         buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
2594         es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
2595         buf->f_namelen = EXT3_NAME_LEN;
2596         fsid = le64_to_cpup((void *)es->s_uuid) ^
2597                le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2598         buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2599         buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
2600         return 0;
2601 }
2602
2603 /* Helper function for writing quotas on sync - we need to start transaction before quota file
2604  * is locked for write. Otherwise the are possible deadlocks:
2605  * Process 1                         Process 2
2606  * ext3_create()                     quota_sync()
2607  *   journal_start()                   write_dquot()
2608  *   DQUOT_INIT()                        down(dqio_mutex)
2609  *     down(dqio_mutex)                    journal_start()
2610  *
2611  */
2612
2613 #ifdef CONFIG_QUOTA
2614
2615 static inline struct inode *dquot_to_inode(struct dquot *dquot)
2616 {
2617         return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2618 }
2619
2620 static int ext3_dquot_initialize(struct inode *inode, int type)
2621 {
2622         handle_t *handle;
2623         int ret, err;
2624
2625         /* We may create quota structure so we need to reserve enough blocks */
2626         handle = ext3_journal_start(inode, 2*EXT3_QUOTA_INIT_BLOCKS(inode->i_sb));
2627         if (IS_ERR(handle))
2628                 return PTR_ERR(handle);
2629         ret = dquot_initialize(inode, type);
2630         err = ext3_journal_stop(handle);
2631         if (!ret)
2632                 ret = err;
2633         return ret;
2634 }
2635
2636 static int ext3_dquot_drop(struct inode *inode)
2637 {
2638         handle_t *handle;
2639         int ret, err;
2640
2641         /* We may delete quota structure so we need to reserve enough blocks */
2642         handle = ext3_journal_start(inode, 2*EXT3_QUOTA_DEL_BLOCKS(inode->i_sb));
2643         if (IS_ERR(handle))
2644                 return PTR_ERR(handle);
2645         ret = dquot_drop(inode);
2646         err = ext3_journal_stop(handle);
2647         if (!ret)
2648                 ret = err;
2649         return ret;
2650 }
2651
2652 static int ext3_write_dquot(struct dquot *dquot)
2653 {
2654         int ret, err;
2655         handle_t *handle;
2656         struct inode *inode;
2657
2658         inode = dquot_to_inode(dquot);
2659         handle = ext3_journal_start(inode,
2660                                         EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2661         if (IS_ERR(handle))
2662                 return PTR_ERR(handle);
2663         ret = dquot_commit(dquot);
2664         err = ext3_journal_stop(handle);
2665         if (!ret)
2666                 ret = err;
2667         return ret;
2668 }
2669
2670 static int ext3_acquire_dquot(struct dquot *dquot)
2671 {
2672         int ret, err;
2673         handle_t *handle;
2674
2675         handle = ext3_journal_start(dquot_to_inode(dquot),
2676                                         EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2677         if (IS_ERR(handle))
2678                 return PTR_ERR(handle);
2679         ret = dquot_acquire(dquot);
2680         err = ext3_journal_stop(handle);
2681         if (!ret)
2682                 ret = err;
2683         return ret;
2684 }
2685
2686 static int ext3_release_dquot(struct dquot *dquot)
2687 {
2688         int ret, err;
2689         handle_t *handle;
2690
2691         handle = ext3_journal_start(dquot_to_inode(dquot),
2692                                         EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2693         if (IS_ERR(handle)) {
2694                 /* Release dquot anyway to avoid endless cycle in dqput() */
2695                 dquot_release(dquot);
2696                 return PTR_ERR(handle);
2697         }
2698         ret = dquot_release(dquot);
2699         err = ext3_journal_stop(handle);
2700         if (!ret)
2701                 ret = err;
2702         return ret;
2703 }
2704
2705 static int ext3_mark_dquot_dirty(struct dquot *dquot)
2706 {
2707         /* Are we journalling quotas? */
2708         if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2709             EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2710                 dquot_mark_dquot_dirty(dquot);
2711                 return ext3_write_dquot(dquot);
2712         } else {
2713                 return dquot_mark_dquot_dirty(dquot);
2714         }
2715 }
2716
2717 static int ext3_write_info(struct super_block *sb, int type)
2718 {
2719         int ret, err;
2720         handle_t *handle;
2721
2722         /* Data block + inode block */
2723         handle = ext3_journal_start(sb->s_root->d_inode, 2);
2724         if (IS_ERR(handle))
2725                 return PTR_ERR(handle);
2726         ret = dquot_commit_info(sb, type);
2727         err = ext3_journal_stop(handle);
2728         if (!ret)
2729                 ret = err;
2730         return ret;
2731 }
2732
2733 /*
2734  * Turn on quotas during mount time - we need to find
2735  * the quota file and such...
2736  */
2737 static int ext3_quota_on_mount(struct super_block *sb, int type)
2738 {
2739         return vfs_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2740                         EXT3_SB(sb)->s_jquota_fmt, type);
2741 }
2742
2743 /*
2744  * Standard function to be called on quota_on
2745  */
2746 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
2747                          char *path, int remount)
2748 {
2749         int err;
2750         struct nameidata nd;
2751
2752         if (!test_opt(sb, QUOTA))
2753                 return -EINVAL;
2754         /* Not journalling quota or remount? */
2755         if ((!EXT3_SB(sb)->s_qf_names[USRQUOTA] &&
2756             !EXT3_SB(sb)->s_qf_names[GRPQUOTA]) || remount)
2757                 return vfs_quota_on(sb, type, format_id, path, remount);
2758         err = path_lookup(path, LOOKUP_FOLLOW, &nd);
2759         if (err)
2760                 return err;
2761         /* Quotafile not on the same filesystem? */
2762         if (nd.path.mnt->mnt_sb != sb) {
2763                 path_put(&nd.path);
2764                 return -EXDEV;
2765         }
2766         /* Quotafile not in fs root? */
2767         if (nd.path.dentry->d_parent->d_inode != sb->s_root->d_inode)
2768                 printk(KERN_WARNING
2769                         "EXT3-fs: Quota file not on filesystem root. "
2770                         "Journalled quota will not work.\n");
2771         path_put(&nd.path);
2772         return vfs_quota_on(sb, type, format_id, path, remount);
2773 }
2774
2775 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2776  * acquiring the locks... As quota files are never truncated and quota code
2777  * itself serializes the operations (and noone else should touch the files)
2778  * we don't have to be afraid of races */
2779 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2780                                size_t len, loff_t off)
2781 {
2782         struct inode *inode = sb_dqopt(sb)->files[type];
2783         sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2784         int err = 0;
2785         int offset = off & (sb->s_blocksize - 1);
2786         int tocopy;
2787         size_t toread;
2788         struct buffer_head *bh;
2789         loff_t i_size = i_size_read(inode);
2790
2791         if (off > i_size)
2792                 return 0;
2793         if (off+len > i_size)
2794                 len = i_size-off;
2795         toread = len;
2796         while (toread > 0) {
2797                 tocopy = sb->s_blocksize - offset < toread ?
2798                                 sb->s_blocksize - offset : toread;
2799                 bh = ext3_bread(NULL, inode, blk, 0, &err);
2800                 if (err)
2801                         return err;
2802                 if (!bh)        /* A hole? */
2803                         memset(data, 0, tocopy);
2804                 else
2805                         memcpy(data, bh->b_data+offset, tocopy);
2806                 brelse(bh);
2807                 offset = 0;
2808                 toread -= tocopy;
2809                 data += tocopy;
2810                 blk++;
2811         }
2812         return len;
2813 }
2814
2815 /* Write to quotafile (we know the transaction is already started and has
2816  * enough credits) */
2817 static ssize_t ext3_quota_write(struct super_block *sb, int type,
2818                                 const char *data, size_t len, loff_t off)
2819 {
2820         struct inode *inode = sb_dqopt(sb)->files[type];
2821         sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2822         int err = 0;
2823         int offset = off & (sb->s_blocksize - 1);
2824         int tocopy;
2825         int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
2826         size_t towrite = len;
2827         struct buffer_head *bh;
2828         handle_t *handle = journal_current_handle();
2829
2830         if (!handle) {
2831                 printk(KERN_WARNING "EXT3-fs: Quota write (off=%Lu, len=%Lu)"
2832                         " cancelled because transaction is not started.\n",
2833                         (unsigned long long)off, (unsigned long long)len);
2834                 return -EIO;
2835         }
2836         mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2837         while (towrite > 0) {
2838                 tocopy = sb->s_blocksize - offset < towrite ?
2839                                 sb->s_blocksize - offset : towrite;
2840                 bh = ext3_bread(handle, inode, blk, 1, &err);
2841                 if (!bh)
2842                         goto out;
2843                 if (journal_quota) {
2844                         err = ext3_journal_get_write_access(handle, bh);
2845                         if (err) {
2846                                 brelse(bh);
2847                                 goto out;
2848                         }
2849                 }
2850                 lock_buffer(bh);
2851                 memcpy(bh->b_data+offset, data, tocopy);
2852                 flush_dcache_page(bh->b_page);
2853                 unlock_buffer(bh);
2854                 if (journal_quota)
2855                         err = ext3_journal_dirty_metadata(handle, bh);
2856                 else {
2857                         /* Always do at least ordered writes for quotas */
2858                         err = ext3_journal_dirty_data(handle, bh);
2859                         mark_buffer_dirty(bh);
2860                 }
2861                 brelse(bh);
2862                 if (err)
2863                         goto out;
2864                 offset = 0;
2865                 towrite -= tocopy;
2866                 data += tocopy;
2867                 blk++;
2868         }
2869 out:
2870         if (len == towrite)
2871                 return err;
2872         if (inode->i_size < off+len-towrite) {
2873                 i_size_write(inode, off+len-towrite);
2874                 EXT3_I(inode)->i_disksize = inode->i_size;
2875         }
2876         inode->i_version++;
2877         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2878         ext3_mark_inode_dirty(handle, inode);
2879         mutex_unlock(&inode->i_mutex);
2880         return len - towrite;
2881 }
2882
2883 #endif
2884
2885 static int ext3_get_sb(struct file_system_type *fs_type,
2886         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
2887 {
2888         return get_sb_bdev(fs_type, flags, dev_name, data, ext3_fill_super, mnt);
2889 }
2890
2891 static struct file_system_type ext3_fs_type = {
2892         .owner          = THIS_MODULE,
2893         .name           = "ext3",
2894         .get_sb         = ext3_get_sb,
2895         .kill_sb        = kill_block_super,
2896         .fs_flags       = FS_REQUIRES_DEV,
2897 };
2898
2899 static int __init init_ext3_fs(void)
2900 {
2901         int err = init_ext3_xattr();
2902         if (err)
2903                 return err;
2904         err = init_inodecache();
2905         if (err)
2906                 goto out1;
2907         err = register_filesystem(&ext3_fs_type);
2908         if (err)
2909                 goto out;
2910         return 0;
2911 out:
2912         destroy_inodecache();
2913 out1:
2914         exit_ext3_xattr();
2915         return err;
2916 }
2917
2918 static void __exit exit_ext3_fs(void)
2919 {
2920         unregister_filesystem(&ext3_fs_type);
2921         destroy_inodecache();
2922         exit_ext3_xattr();
2923 }
2924
2925 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
2926 MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
2927 MODULE_LICENSE("GPL");
2928 module_init(init_ext3_fs)
2929 module_exit(exit_ext3_fs)