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, __func__,
  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         if (EXT3_SB(sb)->s_journal)
 285                 journal_abort(EXT3_SB(sb)->s_journal, -EIO);
 286 }
 287
 288 void ext3_warning (struct super_block * sb, const char * function,
 289                    const char * fmt, ...)
 290 {
 291         va_list args;
 292
 293         va_start(args, fmt);
 294         printk(KERN_WARNING "EXT3-fs warning (device %s): %s: ",
 295                sb->s_id, function);
 296         vprintk(fmt, args);
 297         printk("\n");
 298         va_end(args);
 299 }
 300
 301 void ext3_update_dynamic_rev(struct super_block *sb)
 302 {
 303         struct ext3_super_block *es = EXT3_SB(sb)->s_es;
 304
 305         if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
 306                 return;
 307
 308         ext3_warning(sb, __func__,
 309                      "updating to rev %d because of new feature flag, "
 310                      "running e2fsck is recommended",
 311                      EXT3_DYNAMIC_REV);
 312
 313         es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO);
 314         es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE);
 315         es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV);
 316         /* leave es->s_feature_*compat flags alone */
 317         /* es->s_uuid will be set by e2fsck if empty */
 318
 319         /*
 320          * The rest of the superblock fields should be zero, and if not it
 321          * means they are likely already in use, so leave them alone.  We
 322          * can leave it up to e2fsck to clean up any inconsistencies there.
 323          */
 324 }
 325
 326 /*
 327  * Open the external journal device
 328  */
 329 static struct block_device *ext3_blkdev_get(dev_t dev)
 330 {
 331         struct block_device *bdev;
 332         char b[BDEVNAME_SIZE];
 333
 334         bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
 335         if (IS_ERR(bdev))
 336                 goto fail;
 337         return bdev;
 338
 339 fail:
 340         printk(KERN_ERR "EXT3: failed to open journal device %s: %ld\n",
 341                         __bdevname(dev, b), PTR_ERR(bdev));
 342         return NULL;
 343 }
 344
 345 /*
 346  * Release the journal device
 347  */
 348 static int ext3_blkdev_put(struct block_device *bdev)
 349 {
 350         bd_release(bdev);
 351         return blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
 352 }
 353
 354 static int ext3_blkdev_remove(struct ext3_sb_info *sbi)
 355 {
 356         struct block_device *bdev;
 357         int ret = -ENODEV;
 358
 359         bdev = sbi->journal_bdev;
 360         if (bdev) {
 361                 ret = ext3_blkdev_put(bdev);
 362                 sbi->journal_bdev = NULL;
 363         }
 364         return ret;
 365 }
 366
 367 static inline struct inode *orphan_list_entry(struct list_head *l)
 368 {
 369         return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
 370 }
 371
 372 static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
 373 {
 374         struct list_head *l;
 375
 376         printk(KERN_ERR "sb orphan head is %d\n",
 377                le32_to_cpu(sbi->s_es->s_last_orphan));
 378
 379         printk(KERN_ERR "sb_info orphan list:\n");
 380         list_for_each(l, &sbi->s_orphan) {
 381                 struct inode *inode = orphan_list_entry(l);
 382                 printk(KERN_ERR "  "
 383                        "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
 384                        inode->i_sb->s_id, inode->i_ino, inode,
 385                        inode->i_mode, inode->i_nlink,
 386                        NEXT_ORPHAN(inode));
 387         }
 388 }
 389
 390 static void ext3_put_super (struct super_block * sb)
 391 {
 392         struct ext3_sb_info *sbi = EXT3_SB(sb);
 393         struct ext3_super_block *es = sbi->s_es;
 394         int i, err;
 395
 396         ext3_xattr_put_super(sb);
 397         err = journal_destroy(sbi->s_journal);
 398         sbi->s_journal = NULL;
 399         if (err < 0)
 400                 ext3_abort(sb, __func__, "Couldn't clean up the journal");
 401
 402         if (!(sb->s_flags & MS_RDONLY)) {
 403                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
 404                 es->s_state = cpu_to_le16(sbi->s_mount_state);
 405                 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
 406                 mark_buffer_dirty(sbi->s_sbh);
 407                 ext3_commit_super(sb, es, 1);
 408         }
 409
 410         for (i = 0; i < sbi->s_gdb_count; i++)
 411                 brelse(sbi->s_group_desc[i]);
 412         kfree(sbi->s_group_desc);
 413         percpu_counter_destroy(&sbi->s_freeblocks_counter);
 414         percpu_counter_destroy(&sbi->s_freeinodes_counter);
 415         percpu_counter_destroy(&sbi->s_dirs_counter);
 416         brelse(sbi->s_sbh);
 417 #ifdef CONFIG_QUOTA
 418         for (i = 0; i < MAXQUOTAS; i++)
 419                 kfree(sbi->s_qf_names[i]);
 420 #endif
 421
 422         /* Debugging code just in case the in-memory inode orphan list
 423          * isn't empty.  The on-disk one can be non-empty if we've
 424          * detected an error and taken the fs readonly, but the
 425          * in-memory list had better be clean by this point. */
 426         if (!list_empty(&sbi->s_orphan))
 427                 dump_orphan_list(sb, sbi);
 428         J_ASSERT(list_empty(&sbi->s_orphan));
 429
 430         invalidate_bdev(sb->s_bdev);
 431         if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
 432                 /*
 433                  * Invalidate the journal device's buffers.  We don't want them
 434                  * floating about in memory - the physical journal device may
 435                  * hotswapped, and it breaks the `ro-after' testing code.
 436                  */
 437                 sync_blockdev(sbi->journal_bdev);
 438                 invalidate_bdev(sbi->journal_bdev);
 439                 ext3_blkdev_remove(sbi);
 440         }
 441         sb->s_fs_info = NULL;
 442         kfree(sbi);
 443         return;
 444 }
 445
 446 static struct kmem_cache *ext3_inode_cachep;
 447
 448 /*
 449  * Called inside transaction, so use GFP_NOFS
 450  */
 451 static struct inode *ext3_alloc_inode(struct super_block *sb)
 452 {
 453         struct ext3_inode_info *ei;
 454
 455         ei = kmem_cache_alloc(ext3_inode_cachep, GFP_NOFS);
 456         if (!ei)
 457                 return NULL;
 458 #ifdef CONFIG_EXT3_FS_POSIX_ACL
 459         ei->i_acl = EXT3_ACL_NOT_CACHED;
 460         ei->i_default_acl = EXT3_ACL_NOT_CACHED;
 461 #endif
 462         ei->i_block_alloc_info = NULL;
 463         ei->vfs_inode.i_version = 1;
 464         return &ei->vfs_inode;
 465 }
 466
 467 static void ext3_destroy_inode(struct inode *inode)
 468 {
 469         if (!list_empty(&(EXT3_I(inode)->i_orphan))) {
 470                 printk("EXT3 Inode %p: orphan list check failed!\n",
 471                         EXT3_I(inode));
 472                 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
 473                                 EXT3_I(inode), sizeof(struct ext3_inode_info),
 474                                 false);
 475                 dump_stack();
 476         }
 477         kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
 478 }
 479
 480 static void init_once(void *foo)
 481 {
 482         struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
 483
 484         INIT_LIST_HEAD(&ei->i_orphan);
 485 #ifdef CONFIG_EXT3_FS_XATTR
 486         init_rwsem(&ei->xattr_sem);
 487 #endif
 488         mutex_init(&ei->truncate_mutex);
 489         inode_init_once(&ei->vfs_inode);
 490 }
 491
 492 static int init_inodecache(void)
 493 {
 494         ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
 495                                              sizeof(struct ext3_inode_info),
 496                                              0, (SLAB_RECLAIM_ACCOUNT|
 497                                                 SLAB_MEM_SPREAD),
 498                                              init_once);
 499         if (ext3_inode_cachep == NULL)
 500                 return -ENOMEM;
 501         return 0;
 502 }
 503
 504 static void destroy_inodecache(void)
 505 {
 506         kmem_cache_destroy(ext3_inode_cachep);
 507 }
 508
 509 static void ext3_clear_inode(struct inode *inode)
 510 {
 511         struct ext3_block_alloc_info *rsv = EXT3_I(inode)->i_block_alloc_info;
 512 #ifdef CONFIG_EXT3_FS_POSIX_ACL
 513         if (EXT3_I(inode)->i_acl &&
 514                         EXT3_I(inode)->i_acl != EXT3_ACL_NOT_CACHED) {
 515                 posix_acl_release(EXT3_I(inode)->i_acl);
 516                 EXT3_I(inode)->i_acl = EXT3_ACL_NOT_CACHED;
 517         }
 518         if (EXT3_I(inode)->i_default_acl &&
 519                         EXT3_I(inode)->i_default_acl != EXT3_ACL_NOT_CACHED) {
 520                 posix_acl_release(EXT3_I(inode)->i_default_acl);
 521                 EXT3_I(inode)->i_default_acl = EXT3_ACL_NOT_CACHED;
 522         }
 523 #endif
 524         ext3_discard_reservation(inode);
 525         EXT3_I(inode)->i_block_alloc_info = NULL;
 526         if (unlikely(rsv))
 527                 kfree(rsv);
 528 }
 529
 530 static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
 531 {
 532 #if defined(CONFIG_QUOTA)
 533         struct ext3_sb_info *sbi = EXT3_SB(sb);
 534
 535         if (sbi->s_jquota_fmt)
 536                 seq_printf(seq, ",jqfmt=%s",
 537                 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0");
 538
 539         if (sbi->s_qf_names[USRQUOTA])
 540                 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
 541
 542         if (sbi->s_qf_names[GRPQUOTA])
 543                 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
 544
 545         if (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA)
 546                 seq_puts(seq, ",usrquota");
 547
 548         if (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)
 549                 seq_puts(seq, ",grpquota");
 550 #endif
 551 }
 552
 553 /*
 554  * Show an option if
 555  *  - it's set to a non-default value OR
 556  *  - if the per-sb default is different from the global default
 557  */
 558 static int ext3_show_options(struct seq_file *seq, struct vfsmount *vfs)
 559 {
 560         struct super_block *sb = vfs->mnt_sb;
 561         struct ext3_sb_info *sbi = EXT3_SB(sb);
 562         struct ext3_super_block *es = sbi->s_es;
 563         unsigned long def_mount_opts;
 564
 565         def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
 566
 567         if (sbi->s_sb_block != 1)
 568                 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
 569         if (test_opt(sb, MINIX_DF))
 570                 seq_puts(seq, ",minixdf");
 571         if (test_opt(sb, GRPID))
 572                 seq_puts(seq, ",grpid");
 573         if (!test_opt(sb, GRPID) && (def_mount_opts & EXT3_DEFM_BSDGROUPS))
 574                 seq_puts(seq, ",nogrpid");
 575         if (sbi->s_resuid != EXT3_DEF_RESUID ||
 576             le16_to_cpu(es->s_def_resuid) != EXT3_DEF_RESUID) {
 577                 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
 578         }
 579         if (sbi->s_resgid != EXT3_DEF_RESGID ||
 580             le16_to_cpu(es->s_def_resgid) != EXT3_DEF_RESGID) {
 581                 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
 582         }
 583         if (test_opt(sb, ERRORS_RO)) {
 584                 int def_errors = le16_to_cpu(es->s_errors);
 585
 586                 if (def_errors == EXT3_ERRORS_PANIC ||
 587                     def_errors == EXT3_ERRORS_CONTINUE) {
 588                         seq_puts(seq, ",errors=remount-ro");
 589                 }
 590         }
 591         if (test_opt(sb, ERRORS_CONT))
 592                 seq_puts(seq, ",errors=continue");
 593         if (test_opt(sb, ERRORS_PANIC))
 594                 seq_puts(seq, ",errors=panic");
 595         if (test_opt(sb, NO_UID32))
 596                 seq_puts(seq, ",nouid32");
 597         if (test_opt(sb, DEBUG))
 598                 seq_puts(seq, ",debug");
 599         if (test_opt(sb, OLDALLOC))
 600                 seq_puts(seq, ",oldalloc");
 601 #ifdef CONFIG_EXT3_FS_XATTR
 602         if (test_opt(sb, XATTR_USER))
 603                 seq_puts(seq, ",user_xattr");
 604         if (!test_opt(sb, XATTR_USER) &&
 605             (def_mount_opts & EXT3_DEFM_XATTR_USER)) {
 606                 seq_puts(seq, ",nouser_xattr");
 607         }
 608 #endif
 609 #ifdef CONFIG_EXT3_FS_POSIX_ACL
 610         if (test_opt(sb, POSIX_ACL))
 611                 seq_puts(seq, ",acl");
 612         if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT3_DEFM_ACL))
 613                 seq_puts(seq, ",noacl");
 614 #endif
 615         if (!test_opt(sb, RESERVATION))
 616                 seq_puts(seq, ",noreservation");
 617         if (sbi->s_commit_interval) {
 618                 seq_printf(seq, ",commit=%u",
 619                            (unsigned) (sbi->s_commit_interval / HZ));
 620         }
 621         if (test_opt(sb, BARRIER))
 622                 seq_puts(seq, ",barrier=1");
 623         if (test_opt(sb, NOBH))
 624                 seq_puts(seq, ",nobh");
 625
 626         if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA)
 627                 seq_puts(seq, ",data=journal");
 628         else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA)
 629                 seq_puts(seq, ",data=ordered");
 630         else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)
 631                 seq_puts(seq, ",data=writeback");
 632
 633         if (test_opt(sb, DATA_ERR_ABORT))
 634                 seq_puts(seq, ",data_err=abort");
 635
 636         ext3_show_quota_options(seq, sb);
 637
 638         return 0;
 639 }
 640
 641
 642 static struct inode *ext3_nfs_get_inode(struct super_block *sb,
 643                 u64 ino, u32 generation)
 644 {
 645         struct inode *inode;
 646
 647         if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO)
 648                 return ERR_PTR(-ESTALE);
 649         if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count))
 650                 return ERR_PTR(-ESTALE);
 651
 652         /* iget isn't really right if the inode is currently unallocated!!
 653          *
 654          * ext3_read_inode will return a bad_inode if the inode had been
 655          * deleted, so we should be safe.
 656          *
 657          * Currently we don't know the generation for parent directory, so
 658          * a generation of 0 means "accept any"
 659          */
 660         inode = ext3_iget(sb, ino);
 661         if (IS_ERR(inode))
 662                 return ERR_CAST(inode);
 663         if (generation && inode->i_generation != generation) {
 664                 iput(inode);
 665                 return ERR_PTR(-ESTALE);
 666         }
 667
 668         return inode;
 669 }
 670
 671 static struct dentry *ext3_fh_to_dentry(struct super_block *sb, struct fid *fid,
 672                 int fh_len, int fh_type)
 673 {
 674         return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
 675                                     ext3_nfs_get_inode);
 676 }
 677
 678 static struct dentry *ext3_fh_to_parent(struct super_block *sb, struct fid *fid,
 679                 int fh_len, int fh_type)
 680 {
 681         return generic_fh_to_parent(sb, fid, fh_len, fh_type,
 682                                     ext3_nfs_get_inode);
 683 }
 684
 685 #ifdef CONFIG_QUOTA
 686 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
 687 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
 688
 689 static int ext3_dquot_initialize(struct inode *inode, int type);
 690 static int ext3_dquot_drop(struct inode *inode);
 691 static int ext3_write_dquot(struct dquot *dquot);
 692 static int ext3_acquire_dquot(struct dquot *dquot);
 693 static int ext3_release_dquot(struct dquot *dquot);
 694 static int ext3_mark_dquot_dirty(struct dquot *dquot);
 695 static int ext3_write_info(struct super_block *sb, int type);
 696 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
 697                                 char *path, int remount);
 698 static int ext3_quota_on_mount(struct super_block *sb, int type);
 699 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
 700                                size_t len, loff_t off);
 701 static ssize_t ext3_quota_write(struct super_block *sb, int type,
 702                                 const char *data, size_t len, loff_t off);
 703
 704 static struct dquot_operations ext3_quota_operations = {
 705         .initialize     = ext3_dquot_initialize,
 706         .drop           = ext3_dquot_drop,
 707         .alloc_space    = dquot_alloc_space,
 708         .alloc_inode    = dquot_alloc_inode,
 709         .free_space     = dquot_free_space,
 710         .free_inode     = dquot_free_inode,
 711         .transfer       = dquot_transfer,
 712         .write_dquot    = ext3_write_dquot,
 713         .acquire_dquot  = ext3_acquire_dquot,
 714         .release_dquot  = ext3_release_dquot,
 715         .mark_dirty     = ext3_mark_dquot_dirty,
 716         .write_info     = ext3_write_info
 717 };
 718
 719 static struct quotactl_ops ext3_qctl_operations = {
 720         .quota_on       = ext3_quota_on,
 721         .quota_off      = vfs_quota_off,
 722         .quota_sync     = vfs_quota_sync,
 723         .get_info       = vfs_get_dqinfo,
 724         .set_info       = vfs_set_dqinfo,
 725         .get_dqblk      = vfs_get_dqblk,
 726         .set_dqblk      = vfs_set_dqblk
 727 };
 728 #endif
 729
 730 static const struct super_operations ext3_sops = {
 731         .alloc_inode    = ext3_alloc_inode,
 732         .destroy_inode  = ext3_destroy_inode,
 733         .write_inode    = ext3_write_inode,
 734         .dirty_inode    = ext3_dirty_inode,
 735         .delete_inode   = ext3_delete_inode,
 736         .put_super      = ext3_put_super,
 737         .write_super    = ext3_write_super,
 738         .sync_fs        = ext3_sync_fs,
 739         .write_super_lockfs = ext3_write_super_lockfs,
 740         .unlockfs       = ext3_unlockfs,
 741         .statfs         = ext3_statfs,
 742         .remount_fs     = ext3_remount,
 743         .clear_inode    = ext3_clear_inode,
 744         .show_options   = ext3_show_options,
 745 #ifdef CONFIG_QUOTA
 746         .quota_read     = ext3_quota_read,
 747         .quota_write    = ext3_quota_write,
 748 #endif
 749 };
 750
 751 static const struct export_operations ext3_export_ops = {
 752         .fh_to_dentry = ext3_fh_to_dentry,
 753         .fh_to_parent = ext3_fh_to_parent,
 754         .get_parent = ext3_get_parent,
 755 };
 756
 757 enum {
 758         Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
 759         Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
 760         Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
 761         Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
 762         Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
 763         Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
 764         Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
 765         Opt_data_err_abort, Opt_data_err_ignore,
 766         Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
 767         Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
 768         Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
 769         Opt_grpquota
 770 };
 771
 772 static const match_table_t tokens = {
 773         {Opt_bsd_df, "bsddf"},
 774         {Opt_minix_df, "minixdf"},
 775         {Opt_grpid, "grpid"},
 776         {Opt_grpid, "bsdgroups"},
 777         {Opt_nogrpid, "nogrpid"},
 778         {Opt_nogrpid, "sysvgroups"},
 779         {Opt_resgid, "resgid=%u"},
 780         {Opt_resuid, "resuid=%u"},
 781         {Opt_sb, "sb=%u"},
 782         {Opt_err_cont, "errors=continue"},
 783         {Opt_err_panic, "errors=panic"},
 784         {Opt_err_ro, "errors=remount-ro"},
 785         {Opt_nouid32, "nouid32"},
 786         {Opt_nocheck, "nocheck"},
 787         {Opt_nocheck, "check=none"},
 788         {Opt_debug, "debug"},
 789         {Opt_oldalloc, "oldalloc"},
 790         {Opt_orlov, "orlov"},
 791         {Opt_user_xattr, "user_xattr"},
 792         {Opt_nouser_xattr, "nouser_xattr"},
 793         {Opt_acl, "acl"},
 794         {Opt_noacl, "noacl"},
 795         {Opt_reservation, "reservation"},
 796         {Opt_noreservation, "noreservation"},
 797         {Opt_noload, "noload"},
 798         {Opt_nobh, "nobh"},
 799         {Opt_bh, "bh"},
 800         {Opt_commit, "commit=%u"},
 801         {Opt_journal_update, "journal=update"},
 802         {Opt_journal_inum, "journal=%u"},
 803         {Opt_journal_dev, "journal_dev=%u"},
 804         {Opt_abort, "abort"},
 805         {Opt_data_journal, "data=journal"},
 806         {Opt_data_ordered, "data=ordered"},
 807         {Opt_data_writeback, "data=writeback"},
 808         {Opt_data_err_abort, "data_err=abort"},
 809         {Opt_data_err_ignore, "data_err=ignore"},
 810         {Opt_offusrjquota, "usrjquota="},
 811         {Opt_usrjquota, "usrjquota=%s"},
 812         {Opt_offgrpjquota, "grpjquota="},
 813         {Opt_grpjquota, "grpjquota=%s"},
 814         {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
 815         {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
 816         {Opt_grpquota, "grpquota"},
 817         {Opt_noquota, "noquota"},
 818         {Opt_quota, "quota"},
 819         {Opt_usrquota, "usrquota"},
 820         {Opt_barrier, "barrier=%u"},
 821         {Opt_resize, "resize"},
 822         {Opt_err, NULL},
 823 };
 824
 825 static ext3_fsblk_t get_sb_block(void **data)
 826 {
 827         ext3_fsblk_t    sb_block;
 828         char            *options = (char *) *data;
 829
 830         if (!options || strncmp(options, "sb=", 3) != 0)
 831                 return 1;       /* Default location */
 832         options += 3;
 833         /*todo: use simple_strtoll with >32bit ext3 */
 834         sb_block = simple_strtoul(options, &options, 0);
 835         if (*options && *options != ',') {
 836                 printk("EXT3-fs: Invalid sb specification: %s\n",
 837                        (char *) *data);
 838                 return 1;
 839         }
 840         if (*options == ',')
 841                 options++;
 842         *data = (void *) options;
 843         return sb_block;
 844 }
 845
 846 static int parse_options (char *options, struct super_block *sb,
 847                           unsigned int *inum, unsigned long *journal_devnum,
 848                           ext3_fsblk_t *n_blocks_count, int is_remount)
 849 {
 850         struct ext3_sb_info *sbi = EXT3_SB(sb);
 851         char * p;
 852         substring_t args[MAX_OPT_ARGS];
 853         int data_opt = 0;
 854         int option;
 855 #ifdef CONFIG_QUOTA
 856         int qtype, qfmt;
 857         char *qname;
 858 #endif
 859
 860         if (!options)
 861                 return 1;
 862
 863         while ((p = strsep (&options, ",")) != NULL) {
 864                 int token;
 865                 if (!*p)
 866                         continue;
 867
 868                 token = match_token(p, tokens, args);
 869                 switch (token) {
 870                 case Opt_bsd_df:
 871                         clear_opt (sbi->s_mount_opt, MINIX_DF);
 872                         break;
 873                 case Opt_minix_df:
 874                         set_opt (sbi->s_mount_opt, MINIX_DF);
 875                         break;
 876                 case Opt_grpid:
 877                         set_opt (sbi->s_mount_opt, GRPID);
 878                         break;
 879                 case Opt_nogrpid:
 880                         clear_opt (sbi->s_mount_opt, GRPID);
 881                         break;
 882                 case Opt_resuid:
 883                         if (match_int(&args[0], &option))
 884                                 return 0;
 885                         sbi->s_resuid = option;
 886                         break;
 887                 case Opt_resgid:
 888                         if (match_int(&args[0], &option))
 889                                 return 0;
 890                         sbi->s_resgid = option;
 891                         break;
 892                 case Opt_sb:
 893                         /* handled by get_sb_block() instead of here */
 894                         /* *sb_block = match_int(&args[0]); */
 895                         break;
 896                 case Opt_err_panic:
 897                         clear_opt (sbi->s_mount_opt, ERRORS_CONT);
 898                         clear_opt (sbi->s_mount_opt, ERRORS_RO);
 899                         set_opt (sbi->s_mount_opt, ERRORS_PANIC);
 900                         break;
 901                 case Opt_err_ro:
 902                         clear_opt (sbi->s_mount_opt, ERRORS_CONT);
 903                         clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
 904                         set_opt (sbi->s_mount_opt, ERRORS_RO);
 905                         break;
 906                 case Opt_err_cont:
 907                         clear_opt (sbi->s_mount_opt, ERRORS_RO);
 908                         clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
 909                         set_opt (sbi->s_mount_opt, ERRORS_CONT);
 910                         break;
 911                 case Opt_nouid32:
 912                         set_opt (sbi->s_mount_opt, NO_UID32);
 913                         break;
 914                 case Opt_nocheck:
 915                         clear_opt (sbi->s_mount_opt, CHECK);
 916                         break;
 917                 case Opt_debug:
 918                         set_opt (sbi->s_mount_opt, DEBUG);
 919                         break;
 920                 case Opt_oldalloc:
 921                         set_opt (sbi->s_mount_opt, OLDALLOC);
 922                         break;
 923                 case Opt_orlov:
 924                         clear_opt (sbi->s_mount_opt, OLDALLOC);
 925                         break;
 926 #ifdef CONFIG_EXT3_FS_XATTR
 927                 case Opt_user_xattr:
 928                         set_opt (sbi->s_mount_opt, XATTR_USER);
 929                         break;
 930                 case Opt_nouser_xattr:
 931                         clear_opt (sbi->s_mount_opt, XATTR_USER);
 932                         break;
 933 #else
 934                 case Opt_user_xattr:
 935                 case Opt_nouser_xattr:
 936                         printk("EXT3 (no)user_xattr options not supported\n");
 937                         break;
 938 #endif
 939 #ifdef CONFIG_EXT3_FS_POSIX_ACL
 940                 case Opt_acl:
 941                         set_opt(sbi->s_mount_opt, POSIX_ACL);
 942                         break;
 943                 case Opt_noacl:
 944                         clear_opt(sbi->s_mount_opt, POSIX_ACL);
 945                         break;
 946 #else
 947                 case Opt_acl:
 948                 case Opt_noacl:
 949                         printk("EXT3 (no)acl options not supported\n");
 950                         break;
 951 #endif
 952                 case Opt_reservation:
 953                         set_opt(sbi->s_mount_opt, RESERVATION);
 954                         break;
 955                 case Opt_noreservation:
 956                         clear_opt(sbi->s_mount_opt, RESERVATION);
 957                         break;
 958                 case Opt_journal_update:
 959                         /* @@@ FIXME */
 960                         /* Eventually we will want to be able to create
 961                            a journal file here.  For now, only allow the
 962                            user to specify an existing inode to be the
 963                            journal file. */
 964                         if (is_remount) {
 965                                 printk(KERN_ERR "EXT3-fs: cannot specify "
 966                                        "journal on remount\n");
 967                                 return 0;
 968                         }
 969                         set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
 970                         break;
 971                 case Opt_journal_inum:
 972                         if (is_remount) {
 973                                 printk(KERN_ERR "EXT3-fs: cannot specify "
 974                                        "journal on remount\n");
 975                                 return 0;
 976                         }
 977                         if (match_int(&args[0], &option))
 978                                 return 0;
 979                         *inum = option;
 980                         break;
 981                 case Opt_journal_dev:
 982                         if (is_remount) {
 983                                 printk(KERN_ERR "EXT3-fs: cannot specify "
 984                                        "journal on remount\n");
 985                                 return 0;
 986                         }
 987                         if (match_int(&args[0], &option))
 988                                 return 0;
 989                         *journal_devnum = option;
 990                         break;
 991                 case Opt_noload:
 992                         set_opt (sbi->s_mount_opt, NOLOAD);
 993                         break;
 994                 case Opt_commit:
 995                         if (match_int(&args[0], &option))
 996                                 return 0;
 997                         if (option < 0)
 998                                 return 0;
 999                         if (option == 0)
1000                                 option = JBD_DEFAULT_MAX_COMMIT_AGE;
1001                         sbi->s_commit_interval = HZ * option;
1002                         break;
1003                 case Opt_data_journal:
1004                         data_opt = EXT3_MOUNT_JOURNAL_DATA;
1005                         goto datacheck;
1006                 case Opt_data_ordered:
1007                         data_opt = EXT3_MOUNT_ORDERED_DATA;
1008                         goto datacheck;
1009                 case Opt_data_writeback:
1010                         data_opt = EXT3_MOUNT_WRITEBACK_DATA;
1011                 datacheck:
1012                         if (is_remount) {
1013                                 if ((sbi->s_mount_opt & EXT3_MOUNT_DATA_FLAGS)
1014                                                 != data_opt) {
1015                                         printk(KERN_ERR
1016                                                 "EXT3-fs: cannot change data "
1017                                                 "mode on remount\n");
1018                                         return 0;
1019                                 }
1020                         } else {
1021                                 sbi->s_mount_opt &= ~EXT3_MOUNT_DATA_FLAGS;
1022                                 sbi->s_mount_opt |= data_opt;
1023                         }
1024                         break;
1025                 case Opt_data_err_abort:
1026                         set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1027                         break;
1028                 case Opt_data_err_ignore:
1029                         clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1030                         break;
1031 #ifdef CONFIG_QUOTA
1032                 case Opt_usrjquota:
1033                         qtype = USRQUOTA;
1034                         goto set_qf_name;
1035                 case Opt_grpjquota:
1036                         qtype = GRPQUOTA;
1037 set_qf_name:
1038                         if ((sb_any_quota_enabled(sb) ||
1039                              sb_any_quota_suspended(sb)) &&
1040                             !sbi->s_qf_names[qtype]) {
1041                                 printk(KERN_ERR
1042                                         "EXT3-fs: Cannot change journaled "
1043                                         "quota options when quota turned on.\n");
1044                                 return 0;
1045                         }
1046                         qname = match_strdup(&args[0]);
1047                         if (!qname) {
1048                                 printk(KERN_ERR
1049                                         "EXT3-fs: not enough memory for "
1050                                         "storing quotafile name.\n");
1051                                 return 0;
1052                         }
1053                         if (sbi->s_qf_names[qtype] &&
1054                             strcmp(sbi->s_qf_names[qtype], qname)) {
1055                                 printk(KERN_ERR
1056                                         "EXT3-fs: %s quota file already "
1057                                         "specified.\n", QTYPE2NAME(qtype));
1058                                 kfree(qname);
1059                                 return 0;
1060                         }
1061                         sbi->s_qf_names[qtype] = qname;
1062                         if (strchr(sbi->s_qf_names[qtype], '/')) {
1063                                 printk(KERN_ERR
1064                                         "EXT3-fs: quotafile must be on "
1065                                         "filesystem root.\n");
1066                                 kfree(sbi->s_qf_names[qtype]);
1067                                 sbi->s_qf_names[qtype] = NULL;
1068                                 return 0;
1069                         }
1070                         set_opt(sbi->s_mount_opt, QUOTA);
1071                         break;
1072                 case Opt_offusrjquota:
1073                         qtype = USRQUOTA;
1074                         goto clear_qf_name;
1075                 case Opt_offgrpjquota:
1076                         qtype = GRPQUOTA;
1077 clear_qf_name:
1078                         if ((sb_any_quota_enabled(sb) ||
1079                              sb_any_quota_suspended(sb)) &&
1080                             sbi->s_qf_names[qtype]) {
1081                                 printk(KERN_ERR "EXT3-fs: Cannot change "
1082                                         "journaled quota options when "
1083                                         "quota turned on.\n");
1084                                 return 0;
1085                         }
1086                         /*
1087                          * The space will be released later when all options
1088                          * are confirmed to be correct
1089                          */
1090                         sbi->s_qf_names[qtype] = NULL;
1091                         break;
1092                 case Opt_jqfmt_vfsold:
1093                         qfmt = QFMT_VFS_OLD;
1094                         goto set_qf_format;
1095                 case Opt_jqfmt_vfsv0:
1096                         qfmt = QFMT_VFS_V0;
1097 set_qf_format:
1098                         if ((sb_any_quota_enabled(sb) ||
1099                              sb_any_quota_suspended(sb)) &&
1100                             sbi->s_jquota_fmt != qfmt) {
1101                                 printk(KERN_ERR "EXT3-fs: Cannot change "
1102                                         "journaled quota options when "
1103                                         "quota turned on.\n");
1104                                 return 0;
1105                         }
1106                         sbi->s_jquota_fmt = qfmt;
1107                         break;
1108                 case Opt_quota:
1109                 case Opt_usrquota:
1110                         set_opt(sbi->s_mount_opt, QUOTA);
1111                         set_opt(sbi->s_mount_opt, USRQUOTA);
1112                         break;
1113                 case Opt_grpquota:
1114                         set_opt(sbi->s_mount_opt, QUOTA);
1115                         set_opt(sbi->s_mount_opt, GRPQUOTA);
1116                         break;
1117                 case Opt_noquota:
1118                         if (sb_any_quota_enabled(sb) ||
1119                             sb_any_quota_suspended(sb)) {
1120                                 printk(KERN_ERR "EXT3-fs: Cannot change quota "
1121                                         "options when quota turned on.\n");
1122                                 return 0;
1123                         }
1124                         clear_opt(sbi->s_mount_opt, QUOTA);
1125                         clear_opt(sbi->s_mount_opt, USRQUOTA);
1126                         clear_opt(sbi->s_mount_opt, GRPQUOTA);
1127                         break;
1128 #else
1129                 case Opt_quota:
1130                 case Opt_usrquota:
1131                 case Opt_grpquota:
1132                         printk(KERN_ERR
1133                                 "EXT3-fs: quota options not supported.\n");
1134                         break;
1135                 case Opt_usrjquota:
1136                 case Opt_grpjquota:
1137                 case Opt_offusrjquota:
1138                 case Opt_offgrpjquota:
1139                 case Opt_jqfmt_vfsold:
1140                 case Opt_jqfmt_vfsv0:
1141                         printk(KERN_ERR
1142                                 "EXT3-fs: journaled quota options not "
1143                                 "supported.\n");
1144                         break;
1145                 case Opt_noquota:
1146                         break;
1147 #endif
1148                 case Opt_abort:
1149                         set_opt(sbi->s_mount_opt, ABORT);
1150                         break;
1151                 case Opt_barrier:
1152                         if (match_int(&args[0], &option))
1153                                 return 0;
1154                         if (option)
1155                                 set_opt(sbi->s_mount_opt, BARRIER);
1156                         else
1157                                 clear_opt(sbi->s_mount_opt, BARRIER);
1158                         break;
1159                 case Opt_ignore:
1160                         break;
1161                 case Opt_resize:
1162                         if (!is_remount) {
1163                                 printk("EXT3-fs: resize option only available "
1164                                         "for remount\n");
1165                                 return 0;
1166                         }
1167                         if (match_int(&args[0], &option) != 0)
1168                                 return 0;
1169                         *n_blocks_count = option;
1170                         break;
1171                 case Opt_nobh:
1172                         set_opt(sbi->s_mount_opt, NOBH);
1173                         break;
1174                 case Opt_bh:
1175                         clear_opt(sbi->s_mount_opt, NOBH);
1176                         break;
1177                 default:
1178                         printk (KERN_ERR
1179                                 "EXT3-fs: Unrecognized mount option \"%s\" "
1180                                 "or missing value\n", p);
1181                         return 0;
1182                 }
1183         }
1184 #ifdef CONFIG_QUOTA
1185         if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1186                 if ((sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA) &&
1187                      sbi->s_qf_names[USRQUOTA])
1188                         clear_opt(sbi->s_mount_opt, USRQUOTA);
1189
1190                 if ((sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA) &&
1191                      sbi->s_qf_names[GRPQUOTA])
1192                         clear_opt(sbi->s_mount_opt, GRPQUOTA);
1193
1194                 if ((sbi->s_qf_names[USRQUOTA] &&
1195                                 (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)) ||
1196                     (sbi->s_qf_names[GRPQUOTA] &&
1197                                 (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA))) {
1198                         printk(KERN_ERR "EXT3-fs: old and new quota "
1199                                         "format mixing.\n");
1200                         return 0;
1201                 }
1202
1203                 if (!sbi->s_jquota_fmt) {
1204                         printk(KERN_ERR "EXT3-fs: journaled quota format "
1205                                         "not specified.\n");
1206                         return 0;
1207                 }
1208         } else {
1209                 if (sbi->s_jquota_fmt) {
1210                         printk(KERN_ERR "EXT3-fs: journaled quota format "
1211                                         "specified with no journaling "
1212                                         "enabled.\n");
1213                         return 0;
1214                 }
1215         }
1216 #endif
1217         return 1;
1218 }
1219
1220 static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1221                             int read_only)
1222 {
1223         struct ext3_sb_info *sbi = EXT3_SB(sb);
1224         int res = 0;
1225
1226         if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
1227                 printk (KERN_ERR "EXT3-fs warning: revision level too high, "
1228                         "forcing read-only mode\n");
1229                 res = MS_RDONLY;
1230         }
1231         if (read_only)
1232                 return res;
1233         if (!(sbi->s_mount_state & EXT3_VALID_FS))
1234                 printk (KERN_WARNING "EXT3-fs warning: mounting unchecked fs, "
1235                         "running e2fsck is recommended\n");
1236         else if ((sbi->s_mount_state & EXT3_ERROR_FS))
1237                 printk (KERN_WARNING
1238                         "EXT3-fs warning: mounting fs with errors, "
1239                         "running e2fsck is recommended\n");
1240         else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1241                  le16_to_cpu(es->s_mnt_count) >=
1242                  (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1243                 printk (KERN_WARNING
1244                         "EXT3-fs warning: maximal mount count reached, "
1245                         "running e2fsck is recommended\n");
1246         else if (le32_to_cpu(es->s_checkinterval) &&
1247                 (le32_to_cpu(es->s_lastcheck) +
1248                         le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1249                 printk (KERN_WARNING
1250                         "EXT3-fs warning: checktime reached, "
1251                         "running e2fsck is recommended\n");
1252 #if 0
1253                 /* @@@ We _will_ want to clear the valid bit if we find
1254                    inconsistencies, to force a fsck at reboot.  But for
1255                    a plain journaled filesystem we can keep it set as
1256                    valid forever! :) */
1257         es->s_state &= cpu_to_le16(~EXT3_VALID_FS);
1258 #endif
1259         if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1260                 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
1261         le16_add_cpu(&es->s_mnt_count, 1);
1262         es->s_mtime = cpu_to_le32(get_seconds());
1263         ext3_update_dynamic_rev(sb);
1264         EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1265
1266         ext3_commit_super(sb, es, 1);
1267         if (test_opt(sb, DEBUG))
1268                 printk(KERN_INFO "[EXT3 FS bs=%lu, gc=%lu, "
1269                                 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1270                         sb->s_blocksize,
1271                         sbi->s_groups_count,
1272                         EXT3_BLOCKS_PER_GROUP(sb),
1273                         EXT3_INODES_PER_GROUP(sb),
1274                         sbi->s_mount_opt);
1275
1276         printk(KERN_INFO "EXT3 FS on %s, ", sb->s_id);
1277         if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1278                 char b[BDEVNAME_SIZE];
1279
1280                 printk("external journal on %s\n",
1281                         bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1282         } else {
1283                 printk("internal journal\n");
1284         }
1285         return res;
1286 }
1287
1288 /* Called at mount-time, super-block is locked */
1289 static int ext3_check_descriptors(struct super_block *sb)
1290 {
1291         struct ext3_sb_info *sbi = EXT3_SB(sb);
1292         int i;
1293
1294         ext3_debug ("Checking group descriptors");
1295
1296         for (i = 0; i < sbi->s_groups_count; i++) {
1297                 struct ext3_group_desc *gdp = ext3_get_group_desc(sb, i, NULL);
1298                 ext3_fsblk_t first_block = ext3_group_first_block_no(sb, i);
1299                 ext3_fsblk_t last_block;
1300
1301                 if (i == sbi->s_groups_count - 1)
1302                         last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
1303                 else
1304                         last_block = first_block +
1305                                 (EXT3_BLOCKS_PER_GROUP(sb) - 1);
1306
1307                 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
1308                     le32_to_cpu(gdp->bg_block_bitmap) > last_block)
1309                 {
1310                         ext3_error (sb, "ext3_check_descriptors",
1311                                     "Block bitmap for group %d"
1312                                     " not in group (block %lu)!",
1313                                     i, (unsigned long)
1314                                         le32_to_cpu(gdp->bg_block_bitmap));
1315                         return 0;
1316                 }
1317                 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
1318                     le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
1319                 {
1320                         ext3_error (sb, "ext3_check_descriptors",
1321                                     "Inode bitmap for group %d"
1322                                     " not in group (block %lu)!",
1323                                     i, (unsigned long)
1324                                         le32_to_cpu(gdp->bg_inode_bitmap));
1325                         return 0;
1326                 }
1327                 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
1328                     le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
1329                     last_block)
1330                 {
1331                         ext3_error (sb, "ext3_check_descriptors",
1332                                     "Inode table for group %d"
1333                                     " not in group (block %lu)!",
1334                                     i, (unsigned long)
1335                                         le32_to_cpu(gdp->bg_inode_table));
1336                         return 0;
1337                 }
1338         }
1339
1340         sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1341         sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1342         return 1;
1343 }
1344
1345
1346 /* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1347  * the superblock) which were deleted from all directories, but held open by
1348  * a process at the time of a crash.  We walk the list and try to delete these
1349  * inodes at recovery time (only with a read-write filesystem).
1350  *
1351  * In order to keep the orphan inode chain consistent during traversal (in
1352  * case of crash during recovery), we link each inode into the superblock
1353  * orphan list_head and handle it the same way as an inode deletion during
1354  * normal operation (which journals the operations for us).
1355  *
1356  * We only do an iget() and an iput() on each inode, which is very safe if we
1357  * accidentally point at an in-use or already deleted inode.  The worst that
1358  * can happen in this case is that we get a "bit already cleared" message from
1359  * ext3_free_inode().  The only reason we would point at a wrong inode is if
1360  * e2fsck was run on this filesystem, and it must have already done the orphan
1361  * inode cleanup for us, so we can safely abort without any further action.
1362  */
1363 static void ext3_orphan_cleanup (struct super_block * sb,
1364                                  struct ext3_super_block * es)
1365 {
1366         unsigned int s_flags = sb->s_flags;
1367         int nr_orphans = 0, nr_truncates = 0;
1368 #ifdef CONFIG_QUOTA
1369         int i;
1370 #endif
1371         if (!es->s_last_orphan) {
1372                 jbd_debug(4, "no orphan inodes to clean up\n");
1373                 return;
1374         }
1375
1376         if (bdev_read_only(sb->s_bdev)) {
1377                 printk(KERN_ERR "EXT3-fs: write access "
1378                         "unavailable, skipping orphan cleanup.\n");
1379                 return;
1380         }
1381
1382         if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1383                 if (es->s_last_orphan)
1384                         jbd_debug(1, "Errors on filesystem, "
1385                                   "clearing orphan list.\n");
1386                 es->s_last_orphan = 0;
1387                 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1388                 return;
1389         }
1390
1391         if (s_flags & MS_RDONLY) {
1392                 printk(KERN_INFO "EXT3-fs: %s: orphan cleanup on readonly fs\n",
1393                        sb->s_id);
1394                 sb->s_flags &= ~MS_RDONLY;
1395         }
1396 #ifdef CONFIG_QUOTA
1397         /* Needed for iput() to work correctly and not trash data */
1398         sb->s_flags |= MS_ACTIVE;
1399         /* Turn on quotas so that they are updated correctly */
1400         for (i = 0; i < MAXQUOTAS; i++) {
1401                 if (EXT3_SB(sb)->s_qf_names[i]) {
1402                         int ret = ext3_quota_on_mount(sb, i);
1403                         if (ret < 0)
1404                                 printk(KERN_ERR
1405                                         "EXT3-fs: Cannot turn on journaled "
1406                                         "quota: error %d\n", ret);
1407                 }
1408         }
1409 #endif
1410
1411         while (es->s_last_orphan) {
1412                 struct inode *inode;
1413
1414                 inode = ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1415                 if (IS_ERR(inode)) {
1416                         es->s_last_orphan = 0;
1417                         break;
1418                 }
1419
1420                 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1421                 DQUOT_INIT(inode);
1422                 if (inode->i_nlink) {
1423                         printk(KERN_DEBUG
1424                                 "%s: truncating inode %lu to %Ld bytes\n",
1425                                 __func__, inode->i_ino, inode->i_size);
1426                         jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1427                                   inode->i_ino, inode->i_size);
1428                         ext3_truncate(inode);
1429                         nr_truncates++;
1430                 } else {
1431                         printk(KERN_DEBUG
1432                                 "%s: deleting unreferenced inode %lu\n",
1433                                 __func__, inode->i_ino);
1434                         jbd_debug(2, "deleting unreferenced inode %lu\n",
1435                                   inode->i_ino);
1436                         nr_orphans++;
1437                 }
1438                 iput(inode);  /* The delete magic happens here! */
1439         }
1440
1441 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1442
1443         if (nr_orphans)
1444                 printk(KERN_INFO "EXT3-fs: %s: %d orphan inode%s deleted\n",
1445                        sb->s_id, PLURAL(nr_orphans));
1446         if (nr_truncates)
1447                 printk(KERN_INFO "EXT3-fs: %s: %d truncate%s cleaned up\n",
1448                        sb->s_id, PLURAL(nr_truncates));
1449 #ifdef CONFIG_QUOTA
1450         /* Turn quotas off */
1451         for (i = 0; i < MAXQUOTAS; i++) {
1452                 if (sb_dqopt(sb)->files[i])
1453                         vfs_quota_off(sb, i, 0);
1454         }
1455 #endif
1456         sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1457 }
1458
1459 /*
1460  * Maximal file size.  There is a direct, and {,double-,triple-}indirect
1461  * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1462  * We need to be 1 filesystem block less than the 2^32 sector limit.
1463  */
1464 static loff_t ext3_max_size(int bits)
1465 {
1466         loff_t res = EXT3_NDIR_BLOCKS;
1467         int meta_blocks;
1468         loff_t upper_limit;
1469
1470         /* This is calculated to be the largest file size for a
1471          * dense, file such that the total number of
1472          * sectors in the file, including data and all indirect blocks,
1473          * does not exceed 2^32 -1
1474          * __u32 i_blocks representing the total number of
1475          * 512 bytes blocks of the file
1476          */
1477         upper_limit = (1LL << 32) - 1;
1478
1479         /* total blocks in file system block size */
1480         upper_limit >>= (bits - 9);
1481
1482
1483         /* indirect blocks */
1484         meta_blocks = 1;
1485         /* double indirect blocks */
1486         meta_blocks += 1 + (1LL << (bits-2));
1487         /* tripple indirect blocks */
1488         meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1489
1490         upper_limit -= meta_blocks;
1491         upper_limit <<= bits;
1492
1493         res += 1LL << (bits-2);
1494         res += 1LL << (2*(bits-2));
1495         res += 1LL << (3*(bits-2));
1496         res <<= bits;
1497         if (res > upper_limit)
1498                 res = upper_limit;
1499
1500         if (res > MAX_LFS_FILESIZE)
1501                 res = MAX_LFS_FILESIZE;
1502
1503         return res;
1504 }
1505
1506 static ext3_fsblk_t descriptor_loc(struct super_block *sb,
1507                                     ext3_fsblk_t logic_sb_block,
1508                                     int nr)
1509 {
1510         struct ext3_sb_info *sbi = EXT3_SB(sb);
1511         unsigned long bg, first_meta_bg;
1512         int has_super = 0;
1513
1514         first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1515
1516         if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1517             nr < first_meta_bg)
1518                 return (logic_sb_block + nr + 1);
1519         bg = sbi->s_desc_per_block * nr;
1520         if (ext3_bg_has_super(sb, bg))
1521                 has_super = 1;
1522         return (has_super + ext3_group_first_block_no(sb, bg));
1523 }
1524
1525
1526 static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1527 {
1528         struct buffer_head * bh;
1529         struct ext3_super_block *es = NULL;
1530         struct ext3_sb_info *sbi;
1531         ext3_fsblk_t block;
1532         ext3_fsblk_t sb_block = get_sb_block(&data);
1533         ext3_fsblk_t logic_sb_block;
1534         unsigned long offset = 0;
1535         unsigned int journal_inum = 0;
1536         unsigned long journal_devnum = 0;
1537         unsigned long def_mount_opts;
1538         struct inode *root;
1539         int blocksize;
1540         int hblock;
1541         int db_count;
1542         int i;
1543         int needs_recovery;
1544         int ret = -EINVAL;
1545         __le32 features;
1546         int err;
1547
1548         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1549         if (!sbi)
1550                 return -ENOMEM;
1551         sb->s_fs_info = sbi;
1552         sbi->s_mount_opt = 0;
1553         sbi->s_resuid = EXT3_DEF_RESUID;
1554         sbi->s_resgid = EXT3_DEF_RESGID;
1555         sbi->s_sb_block = sb_block;
1556
1557         unlock_kernel();
1558
1559         blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1560         if (!blocksize) {
1561                 printk(KERN_ERR "EXT3-fs: unable to set blocksize\n");
1562                 goto out_fail;
1563         }
1564
1565         /*
1566          * The ext3 superblock will not be buffer aligned for other than 1kB
1567          * block sizes.  We need to calculate the offset from buffer start.
1568          */
1569         if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1570                 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1571                 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1572         } else {
1573                 logic_sb_block = sb_block;
1574         }
1575
1576         if (!(bh = sb_bread(sb, logic_sb_block))) {
1577                 printk (KERN_ERR "EXT3-fs: unable to read superblock\n");
1578                 goto out_fail;
1579         }
1580         /*
1581          * Note: s_es must be initialized as soon as possible because
1582          *       some ext3 macro-instructions depend on its value
1583          */
1584         es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1585         sbi->s_es = es;
1586         sb->s_magic = le16_to_cpu(es->s_magic);
1587         if (sb->s_magic != EXT3_SUPER_MAGIC)
1588                 goto cantfind_ext3;
1589
1590         /* Set defaults before we parse the mount options */
1591         def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1592         if (def_mount_opts & EXT3_DEFM_DEBUG)
1593                 set_opt(sbi->s_mount_opt, DEBUG);
1594         if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1595                 set_opt(sbi->s_mount_opt, GRPID);
1596         if (def_mount_opts & EXT3_DEFM_UID16)
1597                 set_opt(sbi->s_mount_opt, NO_UID32);
1598 #ifdef CONFIG_EXT3_FS_XATTR
1599         if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1600                 set_opt(sbi->s_mount_opt, XATTR_USER);
1601 #endif
1602 #ifdef CONFIG_EXT3_FS_POSIX_ACL
1603         if (def_mount_opts & EXT3_DEFM_ACL)
1604                 set_opt(sbi->s_mount_opt, POSIX_ACL);
1605 #endif
1606         if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1607                 sbi->s_mount_opt |= EXT3_MOUNT_JOURNAL_DATA;
1608         else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1609                 sbi->s_mount_opt |= EXT3_MOUNT_ORDERED_DATA;
1610         else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1611                 sbi->s_mount_opt |= EXT3_MOUNT_WRITEBACK_DATA;
1612
1613         if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1614                 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1615         else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_CONTINUE)
1616                 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1617         else
1618                 set_opt(sbi->s_mount_opt, ERRORS_RO);
1619
1620         sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1621         sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1622
1623         set_opt(sbi->s_mount_opt, RESERVATION);
1624
1625         if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1626                             NULL, 0))
1627                 goto failed_mount;
1628
1629         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1630                 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1631
1632         if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1633             (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1634              EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1635              EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1636                 printk(KERN_WARNING
1637                        "EXT3-fs warning: feature flags set on rev 0 fs, "
1638                        "running e2fsck is recommended\n");
1639         /*
1640          * Check feature flags regardless of the revision level, since we
1641          * previously didn't change the revision level when setting the flags,
1642          * so there is a chance incompat flags are set on a rev 0 filesystem.
1643          */
1644         features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1645         if (features) {
1646                 printk(KERN_ERR "EXT3-fs: %s: couldn't mount because of "
1647                        "unsupported optional features (%x).\n",
1648                        sb->s_id, le32_to_cpu(features));
1649                 goto failed_mount;
1650         }
1651         features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1652         if (!(sb->s_flags & MS_RDONLY) && features) {
1653                 printk(KERN_ERR "EXT3-fs: %s: couldn't mount RDWR because of "
1654                        "unsupported optional features (%x).\n",
1655                        sb->s_id, le32_to_cpu(features));
1656                 goto failed_mount;
1657         }
1658         blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1659
1660         if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1661             blocksize > EXT3_MAX_BLOCK_SIZE) {
1662                 printk(KERN_ERR
1663                        "EXT3-fs: Unsupported filesystem blocksize %d on %s.\n",
1664                        blocksize, sb->s_id);
1665                 goto failed_mount;
1666         }
1667
1668         hblock = bdev_hardsect_size(sb->s_bdev);
1669         if (sb->s_blocksize != blocksize) {
1670                 /*
1671                  * Make sure the blocksize for the filesystem is larger
1672                  * than the hardware sectorsize for the machine.
1673                  */
1674                 if (blocksize < hblock) {
1675                         printk(KERN_ERR "EXT3-fs: blocksize %d too small for "
1676                                "device blocksize %d.\n", blocksize, hblock);
1677                         goto failed_mount;
1678                 }
1679
1680                 brelse (bh);
1681                 if (!sb_set_blocksize(sb, blocksize)) {
1682                         printk(KERN_ERR "EXT3-fs: bad blocksize %d.\n",
1683                                 blocksize);
1684                         goto out_fail;
1685                 }
1686                 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1687                 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1688                 bh = sb_bread(sb, logic_sb_block);
1689                 if (!bh) {
1690                         printk(KERN_ERR
1691                                "EXT3-fs: Can't read superblock on 2nd try.\n");
1692                         goto failed_mount;
1693                 }
1694                 es = (struct ext3_super_block *)(((char *)bh->b_data) + offset);
1695                 sbi->s_es = es;
1696                 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
1697                         printk (KERN_ERR
1698                                 "EXT3-fs: Magic mismatch, very weird !\n");
1699                         goto failed_mount;
1700                 }
1701         }
1702
1703         sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1704
1705         if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1706                 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1707                 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1708         } else {
1709                 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1710                 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1711                 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
1712                     (!is_power_of_2(sbi->s_inode_size)) ||
1713                     (sbi->s_inode_size > blocksize)) {
1714                         printk (KERN_ERR
1715                                 "EXT3-fs: unsupported inode size: %d\n",
1716                                 sbi->s_inode_size);
1717                         goto failed_mount;
1718                 }
1719         }
1720         sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1721                                    le32_to_cpu(es->s_log_frag_size);
1722         if (blocksize != sbi->s_frag_size) {
1723                 printk(KERN_ERR
1724                        "EXT3-fs: fragsize %lu != blocksize %u (unsupported)\n",
1725                        sbi->s_frag_size, blocksize);
1726                 goto failed_mount;
1727         }
1728         sbi->s_frags_per_block = 1;
1729         sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1730         sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1731         sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1732         if (EXT3_INODE_SIZE(sb) == 0 || EXT3_INODES_PER_GROUP(sb) == 0)
1733                 goto cantfind_ext3;
1734         sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1735         if (sbi->s_inodes_per_block == 0)
1736                 goto cantfind_ext3;
1737         sbi->s_itb_per_group = sbi->s_inodes_per_group /
1738                                         sbi->s_inodes_per_block;
1739         sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1740         sbi->s_sbh = bh;
1741         sbi->s_mount_state = le16_to_cpu(es->s_state);
1742         sbi->s_addr_per_block_bits = ilog2(EXT3_ADDR_PER_BLOCK(sb));
1743         sbi->s_desc_per_block_bits = ilog2(EXT3_DESC_PER_BLOCK(sb));
1744         for (i=0; i < 4; i++)
1745                 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1746         sbi->s_def_hash_version = es->s_def_hash_version;
1747
1748         if (sbi->s_blocks_per_group > blocksize * 8) {
1749                 printk (KERN_ERR
1750                         "EXT3-fs: #blocks per group too big: %lu\n",
1751                         sbi->s_blocks_per_group);
1752                 goto failed_mount;
1753         }
1754         if (sbi->s_frags_per_group > blocksize * 8) {
1755                 printk (KERN_ERR
1756                         "EXT3-fs: #fragments per group too big: %lu\n",
1757                         sbi->s_frags_per_group);
1758                 goto failed_mount;
1759         }
1760         if (sbi->s_inodes_per_group > blocksize * 8) {
1761                 printk (KERN_ERR
1762                         "EXT3-fs: #inodes per group too big: %lu\n",
1763                         sbi->s_inodes_per_group);
1764                 goto failed_mount;
1765         }
1766
1767         if (le32_to_cpu(es->s_blocks_count) >
1768                     (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
1769                 printk(KERN_ERR "EXT3-fs: filesystem on %s:"
1770                         " too large to mount safely\n", sb->s_id);
1771                 if (sizeof(sector_t) < 8)
1772                         printk(KERN_WARNING "EXT3-fs: CONFIG_LBD not "
1773                                         "enabled\n");
1774                 goto failed_mount;
1775         }
1776
1777         if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1778                 goto cantfind_ext3;
1779         sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1780                                le32_to_cpu(es->s_first_data_block) - 1)
1781                                        / EXT3_BLOCKS_PER_GROUP(sb)) + 1;
1782         db_count = (sbi->s_groups_count + EXT3_DESC_PER_BLOCK(sb) - 1) /
1783                    EXT3_DESC_PER_BLOCK(sb);
1784         sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1785                                     GFP_KERNEL);
1786         if (sbi->s_group_desc == NULL) {
1787                 printk (KERN_ERR "EXT3-fs: not enough memory\n");
1788                 goto failed_mount;
1789         }
1790
1791         bgl_lock_init(&sbi->s_blockgroup_lock);
1792
1793         for (i = 0; i < db_count; i++) {
1794                 block = descriptor_loc(sb, logic_sb_block, i);
1795                 sbi->s_group_desc[i] = sb_bread(sb, block);
1796                 if (!sbi->s_group_desc[i]) {
1797                         printk (KERN_ERR "EXT3-fs: "
1798                                 "can't read group descriptor %d\n", i);
1799                         db_count = i;
1800                         goto failed_mount2;
1801                 }
1802         }
1803         if (!ext3_check_descriptors (sb)) {
1804                 printk(KERN_ERR "EXT3-fs: group descriptors corrupted!\n");
1805                 goto failed_mount2;
1806         }
1807         sbi->s_gdb_count = db_count;
1808         get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1809         spin_lock_init(&sbi->s_next_gen_lock);
1810
1811         err = percpu_counter_init(&sbi->s_freeblocks_counter,
1812                         ext3_count_free_blocks(sb));
1813         if (!err) {
1814                 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1815                                 ext3_count_free_inodes(sb));
1816         }
1817         if (!err) {
1818                 err = percpu_counter_init(&sbi->s_dirs_counter,
1819                                 ext3_count_dirs(sb));
1820         }
1821         if (err) {
1822                 printk(KERN_ERR "EXT3-fs: insufficient memory\n");
1823                 goto failed_mount3;
1824         }
1825
1826         /* per fileystem reservation list head & lock */
1827         spin_lock_init(&sbi->s_rsv_window_lock);
1828         sbi->s_rsv_window_root = RB_ROOT;
1829         /* Add a single, static dummy reservation to the start of the
1830          * reservation window list --- it gives us a placeholder for
1831          * append-at-start-of-list which makes the allocation logic
1832          * _much_ simpler. */
1833         sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1834         sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1835         sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1836         sbi->s_rsv_window_head.rsv_goal_size = 0;
1837         ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1838
1839         /*
1840          * set up enough so that it can read an inode
1841          */
1842         sb->s_op = &ext3_sops;
1843         sb->s_export_op = &ext3_export_ops;
1844         sb->s_xattr = ext3_xattr_handlers;
1845 #ifdef CONFIG_QUOTA
1846         sb->s_qcop = &ext3_qctl_operations;
1847         sb->dq_op = &ext3_quota_operations;
1848 #endif
1849         INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1850
1851         sb->s_root = NULL;
1852
1853         needs_recovery = (es->s_last_orphan != 0 ||
1854                           EXT3_HAS_INCOMPAT_FEATURE(sb,
1855                                     EXT3_FEATURE_INCOMPAT_RECOVER));
1856
1857         /*
1858          * The first inode we look at is the journal inode.  Don't try
1859          * root first: it may be modified in the journal!
1860          */
1861         if (!test_opt(sb, NOLOAD) &&
1862             EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
1863                 if (ext3_load_journal(sb, es, journal_devnum))
1864                         goto failed_mount3;
1865         } else if (journal_inum) {
1866                 if (ext3_create_journal(sb, es, journal_inum))
1867                         goto failed_mount3;
1868         } else {
1869                 if (!silent)
1870                         printk (KERN_ERR
1871                                 "ext3: No journal on filesystem on %s\n",
1872                                 sb->s_id);
1873                 goto failed_mount3;
1874         }
1875
1876         /* We have now updated the journal if required, so we can
1877          * validate the data journaling mode. */
1878         switch (test_opt(sb, DATA_FLAGS)) {
1879         case 0:
1880                 /* No mode set, assume a default based on the journal
1881                    capabilities: ORDERED_DATA if the journal can
1882                    cope, else JOURNAL_DATA */
1883                 if (journal_check_available_features
1884                     (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
1885                         set_opt(sbi->s_mount_opt, ORDERED_DATA);
1886                 else
1887                         set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1888                 break;
1889
1890         case EXT3_MOUNT_ORDERED_DATA:
1891         case EXT3_MOUNT_WRITEBACK_DATA:
1892                 if (!journal_check_available_features
1893                     (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
1894                         printk(KERN_ERR "EXT3-fs: Journal does not support "
1895                                "requested data journaling mode\n");
1896                         goto failed_mount4;
1897                 }
1898         default:
1899                 break;
1900         }
1901
1902         if (test_opt(sb, NOBH)) {
1903                 if (!(test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)) {
1904                         printk(KERN_WARNING "EXT3-fs: Ignoring nobh option - "
1905                                 "its supported only with writeback mode\n");
1906                         clear_opt(sbi->s_mount_opt, NOBH);
1907                 }
1908         }
1909         /*
1910          * The journal_load will have done any necessary log recovery,
1911          * so we can safely mount the rest of the filesystem now.
1912          */
1913
1914         root = ext3_iget(sb, EXT3_ROOT_INO);
1915         if (IS_ERR(root)) {
1916                 printk(KERN_ERR "EXT3-fs: get root inode failed\n");
1917                 ret = PTR_ERR(root);
1918                 goto failed_mount4;
1919         }
1920         if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1921                 iput(root);
1922                 printk(KERN_ERR "EXT3-fs: corrupt root inode, run e2fsck\n");
1923                 goto failed_mount4;
1924         }
1925         sb->s_root = d_alloc_root(root);
1926         if (!sb->s_root) {
1927                 printk(KERN_ERR "EXT3-fs: get root dentry failed\n");
1928                 iput(root);
1929                 ret = -ENOMEM;
1930                 goto failed_mount4;
1931         }
1932
1933         ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
1934         /*
1935          * akpm: core read_super() calls in here with the superblock locked.
1936          * That deadlocks, because orphan cleanup needs to lock the superblock
1937          * in numerous places.  Here we just pop the lock - it's relatively
1938          * harmless, because we are now ready to accept write_super() requests,
1939          * and aviro says that's the only reason for hanging onto the
1940          * superblock lock.
1941          */
1942         EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
1943         ext3_orphan_cleanup(sb, es);
1944         EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
1945         if (needs_recovery)
1946                 printk (KERN_INFO "EXT3-fs: recovery complete.\n");
1947         ext3_mark_recovery_complete(sb, es);
1948         printk (KERN_INFO "EXT3-fs: mounted filesystem with %s data mode.\n",
1949                 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
1950                 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
1951                 "writeback");
1952
1953         lock_kernel();
1954         return 0;
1955
1956 cantfind_ext3:
1957         if (!silent)
1958                 printk(KERN_ERR "VFS: Can't find ext3 filesystem on dev %s.\n",
1959                        sb->s_id);
1960         goto failed_mount;
1961
1962 failed_mount4:
1963         journal_destroy(sbi->s_journal);
1964 failed_mount3:
1965         percpu_counter_destroy(&sbi->s_freeblocks_counter);
1966         percpu_counter_destroy(&sbi->s_freeinodes_counter);
1967         percpu_counter_destroy(&sbi->s_dirs_counter);
1968 failed_mount2:
1969         for (i = 0; i < db_count; i++)
1970                 brelse(sbi->s_group_desc[i]);
1971         kfree(sbi->s_group_desc);
1972 failed_mount:
1973 #ifdef CONFIG_QUOTA
1974         for (i = 0; i < MAXQUOTAS; i++)
1975                 kfree(sbi->s_qf_names[i]);
1976 #endif
1977         ext3_blkdev_remove(sbi);
1978         brelse(bh);
1979 out_fail:
1980         sb->s_fs_info = NULL;
1981         kfree(sbi);
1982         lock_kernel();
1983         return ret;
1984 }
1985
1986 /*
1987  * Setup any per-fs journal parameters now.  We'll do this both on
1988  * initial mount, once the journal has been initialised but before we've
1989  * done any recovery; and again on any subsequent remount.
1990  */
1991 static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
1992 {
1993         struct ext3_sb_info *sbi = EXT3_SB(sb);
1994
1995         if (sbi->s_commit_interval)
1996                 journal->j_commit_interval = sbi->s_commit_interval;
1997         /* We could also set up an ext3-specific default for the commit
1998          * interval here, but for now we'll just fall back to the jbd
1999          * default. */
2000
2001         spin_lock(&journal->j_state_lock);
2002         if (test_opt(sb, BARRIER))
2003                 journal->j_flags |= JFS_BARRIER;
2004         else
2005                 journal->j_flags &= ~JFS_BARRIER;
2006         if (test_opt(sb, DATA_ERR_ABORT))
2007                 journal->j_flags |= JFS_ABORT_ON_SYNCDATA_ERR;
2008         else
2009                 journal->j_flags &= ~JFS_ABORT_ON_SYNCDATA_ERR;
2010         spin_unlock(&journal->j_state_lock);
2011 }
2012
2013 static journal_t *ext3_get_journal(struct super_block *sb,
2014                                    unsigned int journal_inum)
2015 {
2016         struct inode *journal_inode;
2017         journal_t *journal;
2018
2019         /* First, test for the existence of a valid inode on disk.  Bad
2020          * things happen if we iget() an unused inode, as the subsequent
2021          * iput() will try to delete it. */
2022
2023         journal_inode = ext3_iget(sb, journal_inum);
2024         if (IS_ERR(journal_inode)) {
2025                 printk(KERN_ERR "EXT3-fs: no journal found.\n");
2026                 return NULL;
2027         }
2028         if (!journal_inode->i_nlink) {
2029                 make_bad_inode(journal_inode);
2030                 iput(journal_inode);
2031                 printk(KERN_ERR "EXT3-fs: journal inode is deleted.\n");
2032                 return NULL;
2033         }
2034
2035         jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2036                   journal_inode, journal_inode->i_size);
2037         if (!S_ISREG(journal_inode->i_mode)) {
2038                 printk(KERN_ERR "EXT3-fs: invalid journal inode.\n");
2039                 iput(journal_inode);
2040                 return NULL;
2041         }
2042
2043         journal = journal_init_inode(journal_inode);
2044         if (!journal) {
2045                 printk(KERN_ERR "EXT3-fs: Could not load journal inode\n");
2046                 iput(journal_inode);
2047                 return NULL;
2048         }
2049         journal->j_private = sb;
2050         ext3_init_journal_params(sb, journal);
2051         return journal;
2052 }
2053
2054 static journal_t *ext3_get_dev_journal(struct super_block *sb,
2055                                        dev_t j_dev)
2056 {
2057         struct buffer_head * bh;
2058         journal_t *journal;
2059         ext3_fsblk_t start;
2060         ext3_fsblk_t len;
2061         int hblock, blocksize;
2062         ext3_fsblk_t sb_block;
2063         unsigned long offset;
2064         struct ext3_super_block * es;
2065         struct block_device *bdev;
2066
2067         bdev = ext3_blkdev_get(j_dev);
2068         if (bdev == NULL)
2069                 return NULL;
2070
2071         if (bd_claim(bdev, sb)) {
2072                 printk(KERN_ERR
2073                         "EXT3: failed to claim external journal device.\n");
2074                 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
2075                 return NULL;
2076         }
2077
2078         blocksize = sb->s_blocksize;
2079         hblock = bdev_hardsect_size(bdev);
2080         if (blocksize < hblock) {
2081                 printk(KERN_ERR
2082                         "EXT3-fs: blocksize too small for journal device.\n");
2083                 goto out_bdev;
2084         }
2085
2086         sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
2087         offset = EXT3_MIN_BLOCK_SIZE % blocksize;
2088         set_blocksize(bdev, blocksize);
2089         if (!(bh = __bread(bdev, sb_block, blocksize))) {
2090                 printk(KERN_ERR "EXT3-fs: couldn't read superblock of "
2091                        "external journal\n");
2092                 goto out_bdev;
2093         }
2094
2095         es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
2096         if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
2097             !(le32_to_cpu(es->s_feature_incompat) &
2098               EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2099                 printk(KERN_ERR "EXT3-fs: external journal has "
2100                                         "bad superblock\n");
2101                 brelse(bh);
2102                 goto out_bdev;
2103         }
2104
2105         if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2106                 printk(KERN_ERR "EXT3-fs: journal UUID does not match\n");
2107                 brelse(bh);
2108                 goto out_bdev;
2109         }
2110
2111         len = le32_to_cpu(es->s_blocks_count);
2112         start = sb_block + 1;
2113         brelse(bh);     /* we're done with the superblock */
2114
2115         journal = journal_init_dev(bdev, sb->s_bdev,
2116                                         start, len, blocksize);
2117         if (!journal) {
2118                 printk(KERN_ERR "EXT3-fs: failed to create device journal\n");
2119                 goto out_bdev;
2120         }
2121         journal->j_private = sb;
2122         ll_rw_block(READ, 1, &journal->j_sb_buffer);
2123         wait_on_buffer(journal->j_sb_buffer);
2124         if (!buffer_uptodate(journal->j_sb_buffer)) {
2125                 printk(KERN_ERR "EXT3-fs: I/O error on journal device\n");
2126                 goto out_journal;
2127         }
2128         if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
2129                 printk(KERN_ERR "EXT3-fs: External journal has more than one "
2130                                         "user (unsupported) - %d\n",
2131                         be32_to_cpu(journal->j_superblock->s_nr_users));
2132                 goto out_journal;
2133         }
2134         EXT3_SB(sb)->journal_bdev = bdev;
2135         ext3_init_journal_params(sb, journal);
2136         return journal;
2137 out_journal:
2138         journal_destroy(journal);
2139 out_bdev:
2140         ext3_blkdev_put(bdev);
2141         return NULL;
2142 }
2143
2144 static int ext3_load_journal(struct super_block *sb,
2145                              struct ext3_super_block *es,
2146                              unsigned long journal_devnum)
2147 {
2148         journal_t *journal;
2149         unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2150         dev_t journal_dev;
2151         int err = 0;
2152         int really_read_only;
2153
2154         if (journal_devnum &&
2155             journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2156                 printk(KERN_INFO "EXT3-fs: external journal device major/minor "
2157                         "numbers have changed\n");
2158                 journal_dev = new_decode_dev(journal_devnum);
2159         } else
2160                 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2161
2162         really_read_only = bdev_read_only(sb->s_bdev);
2163
2164         /*
2165          * Are we loading a blank journal or performing recovery after a
2166          * crash?  For recovery, we need to check in advance whether we
2167          * can get read-write access to the device.
2168          */
2169
2170         if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
2171                 if (sb->s_flags & MS_RDONLY) {
2172                         printk(KERN_INFO "EXT3-fs: INFO: recovery "
2173                                         "required on readonly filesystem.\n");
2174                         if (really_read_only) {
2175                                 printk(KERN_ERR "EXT3-fs: write access "
2176                                         "unavailable, cannot proceed.\n");
2177                                 return -EROFS;
2178                         }
2179                         printk (KERN_INFO "EXT3-fs: write access will "
2180                                         "be enabled during recovery.\n");
2181                 }
2182         }
2183
2184         if (journal_inum && journal_dev) {
2185                 printk(KERN_ERR "EXT3-fs: filesystem has both journal "
2186                        "and inode journals!\n");
2187                 return -EINVAL;
2188         }
2189
2190         if (journal_inum) {
2191                 if (!(journal = ext3_get_journal(sb, journal_inum)))
2192                         return -EINVAL;
2193         } else {
2194                 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
2195                         return -EINVAL;
2196         }
2197
2198         if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2199                 err = journal_update_format(journal);
2200                 if (err)  {
2201                         printk(KERN_ERR "EXT3-fs: error updating journal.\n");
2202                         journal_destroy(journal);
2203                         return err;
2204                 }
2205         }
2206
2207         if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
2208                 err = journal_wipe(journal, !really_read_only);
2209         if (!err)
2210                 err = journal_load(journal);
2211
2212         if (err) {
2213                 printk(KERN_ERR "EXT3-fs: error loading journal.\n");
2214                 journal_destroy(journal);
2215                 return err;
2216         }
2217
2218         EXT3_SB(sb)->s_journal = journal;
2219         ext3_clear_journal_err(sb, es);
2220
2221         if (journal_devnum &&
2222             journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2223                 es->s_journal_dev = cpu_to_le32(journal_devnum);
2224                 sb->s_dirt = 1;
2225
2226                 /* Make sure we flush the recovery flag to disk. */
2227                 ext3_commit_super(sb, es, 1);
2228         }
2229
2230         return 0;
2231 }
2232
2233 static int ext3_create_journal(struct super_block * sb,
2234                                struct ext3_super_block * es,
2235                                unsigned int journal_inum)
2236 {
2237         journal_t *journal;
2238         int err;
2239
2240         if (sb->s_flags & MS_RDONLY) {
2241                 printk(KERN_ERR "EXT3-fs: readonly filesystem when trying to "
2242                                 "create journal.\n");
2243                 return -EROFS;
2244         }
2245
2246         journal = ext3_get_journal(sb, journal_inum);
2247         if (!journal)
2248                 return -EINVAL;
2249
2250         printk(KERN_INFO "EXT3-fs: creating new journal on inode %u\n",
2251                journal_inum);
2252
2253         err = journal_create(journal);
2254         if (err) {
2255                 printk(KERN_ERR "EXT3-fs: error creating journal.\n");
2256                 journal_destroy(journal);
2257                 return -EIO;
2258         }
2259
2260         EXT3_SB(sb)->s_journal = journal;
2261
2262         ext3_update_dynamic_rev(sb);
2263         EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2264         EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2265
2266         es->s_journal_inum = cpu_to_le32(journal_inum);
2267         sb->s_dirt = 1;
2268
2269         /* Make sure we flush the recovery flag to disk. */
2270         ext3_commit_super(sb, es, 1);
2271
2272         return 0;
2273 }
2274
2275 static void ext3_commit_super (struct super_block * sb,
2276                                struct ext3_super_block * es,
2277                                int sync)
2278 {
2279         struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
2280
2281         if (!sbh)
2282                 return;
2283         es->s_wtime = cpu_to_le32(get_seconds());
2284         es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2285         es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2286         BUFFER_TRACE(sbh, "marking dirty");
2287         mark_buffer_dirty(sbh);
2288         if (sync)
2289                 sync_dirty_buffer(sbh);
2290 }
2291
2292
2293 /*
2294  * Have we just finished recovery?  If so, and if we are mounting (or
2295  * remounting) the filesystem readonly, then we will end up with a
2296  * consistent fs on disk.  Record that fact.
2297  */
2298 static void ext3_mark_recovery_complete(struct super_block * sb,
2299                                         struct ext3_super_block * es)
2300 {
2301         journal_t *journal = EXT3_SB(sb)->s_journal;
2302
2303         journal_lock_updates(journal);
2304         if (journal_flush(journal) < 0)
2305                 goto out;
2306
2307         lock_super(sb);
2308         if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2309             sb->s_flags & MS_RDONLY) {
2310                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2311                 sb->s_dirt = 0;
2312                 ext3_commit_super(sb, es, 1);
2313         }
2314         unlock_super(sb);
2315
2316 out:
2317         journal_unlock_updates(journal);
2318 }
2319
2320 /*
2321  * If we are mounting (or read-write remounting) a filesystem whose journal
2322  * has recorded an error from a previous lifetime, move that error to the
2323  * main filesystem now.
2324  */
2325 static void ext3_clear_journal_err(struct super_block * sb,
2326                                    struct ext3_super_block * es)
2327 {
2328         journal_t *journal;
2329         int j_errno;
2330         const char *errstr;
2331
2332         journal = EXT3_SB(sb)->s_journal;
2333
2334         /*
2335          * Now check for any error status which may have been recorded in the
2336          * journal by a prior ext3_error() or ext3_abort()
2337          */
2338
2339         j_errno = journal_errno(journal);
2340         if (j_errno) {
2341                 char nbuf[16];
2342
2343                 errstr = ext3_decode_error(sb, j_errno, nbuf);
2344                 ext3_warning(sb, __func__, "Filesystem error recorded "
2345                              "from previous mount: %s", errstr);
2346                 ext3_warning(sb, __func__, "Marking fs in need of "
2347                              "filesystem check.");
2348
2349                 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2350                 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2351                 ext3_commit_super (sb, es, 1);
2352
2353                 journal_clear_err(journal);
2354         }
2355 }
2356
2357 /*
2358  * Force the running and committing transactions to commit,
2359  * and wait on the commit.
2360  */
2361 int ext3_force_commit(struct super_block *sb)
2362 {
2363         journal_t *journal;
2364         int ret;
2365
2366         if (sb->s_flags & MS_RDONLY)
2367                 return 0;
2368
2369         journal = EXT3_SB(sb)->s_journal;
2370         sb->s_dirt = 0;
2371         ret = ext3_journal_force_commit(journal);
2372         return ret;
2373 }
2374
2375 /*
2376  * Ext3 always journals updates to the superblock itself, so we don't
2377  * have to propagate any other updates to the superblock on disk at this
2378  * point.  Just start an async writeback to get the buffers on their way
2379  * to the disk.
2380  *
2381  * This implicitly triggers the writebehind on sync().
2382  */
2383
2384 static void ext3_write_super (struct super_block * sb)
2385 {
2386         if (mutex_trylock(&sb->s_lock) != 0)
2387                 BUG();
2388         sb->s_dirt = 0;
2389 }
2390
2391 static int ext3_sync_fs(struct super_block *sb, int wait)
2392 {
2393         sb->s_dirt = 0;
2394         if (wait)
2395                 ext3_force_commit(sb);
2396         else
2397                 journal_start_commit(EXT3_SB(sb)->s_journal, NULL);
2398
2399         return 0;
2400 }
2401
2402 /*
2403  * LVM calls this function before a (read-only) snapshot is created.  This
2404  * gives us a chance to flush the journal completely and mark the fs clean.
2405  */
2406 static void ext3_write_super_lockfs(struct super_block *sb)
2407 {
2408         sb->s_dirt = 0;
2409
2410         if (!(sb->s_flags & MS_RDONLY)) {
2411                 journal_t *journal = EXT3_SB(sb)->s_journal;
2412
2413                 /* Now we set up the journal barrier. */
2414                 journal_lock_updates(journal);
2415
2416                 /*
2417                  * We don't want to clear needs_recovery flag when we failed
2418                  * to flush the journal.
2419                  */
2420                 if (journal_flush(journal) < 0)
2421                         return;
2422
2423                 /* Journal blocked and flushed, clear needs_recovery flag. */
2424                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2425                 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2426         }
2427 }
2428
2429 /*
2430  * Called by LVM after the snapshot is done.  We need to reset the RECOVER
2431  * flag here, even though the filesystem is not technically dirty yet.
2432  */
2433 static void ext3_unlockfs(struct super_block *sb)
2434 {
2435         if (!(sb->s_flags & MS_RDONLY)) {
2436                 lock_super(sb);
2437                 /* Reser the needs_recovery flag before the fs is unlocked. */
2438                 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2439                 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2440                 unlock_super(sb);
2441                 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2442         }
2443 }
2444
2445 static int ext3_remount (struct super_block * sb, int * flags, char * data)
2446 {
2447         struct ext3_super_block * es;
2448         struct ext3_sb_info *sbi = EXT3_SB(sb);
2449         ext3_fsblk_t n_blocks_count = 0;
2450         unsigned long old_sb_flags;
2451         struct ext3_mount_options old_opts;
2452         int err;
2453 #ifdef CONFIG_QUOTA
2454         int i;
2455 #endif
2456
2457         /* Store the original options */
2458         old_sb_flags = sb->s_flags;
2459         old_opts.s_mount_opt = sbi->s_mount_opt;
2460         old_opts.s_resuid = sbi->s_resuid;
2461         old_opts.s_resgid = sbi->s_resgid;
2462         old_opts.s_commit_interval = sbi->s_commit_interval;
2463 #ifdef CONFIG_QUOTA
2464         old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2465         for (i = 0; i < MAXQUOTAS; i++)
2466                 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2467 #endif
2468
2469         /*
2470          * Allow the "check" option to be passed as a remount option.
2471          */
2472         if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2473                 err = -EINVAL;
2474                 goto restore_opts;
2475         }
2476
2477         if (sbi->s_mount_opt & EXT3_MOUNT_ABORT)
2478                 ext3_abort(sb, __func__, "Abort forced by user");
2479
2480         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2481                 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2482
2483         es = sbi->s_es;
2484
2485         ext3_init_journal_params(sb, sbi->s_journal);
2486
2487         if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2488                 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
2489                 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT) {
2490                         err = -EROFS;
2491                         goto restore_opts;
2492                 }
2493
2494                 if (*flags & MS_RDONLY) {
2495                         /*
2496                          * First of all, the unconditional stuff we have to do
2497                          * to disable replay of the journal when we next remount
2498                          */
2499                         sb->s_flags |= MS_RDONLY;
2500
2501                         /*
2502                          * OK, test if we are remounting a valid rw partition
2503                          * readonly, and if so set the rdonly flag and then
2504                          * mark the partition as valid again.
2505                          */
2506                         if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2507                             (sbi->s_mount_state & EXT3_VALID_FS))
2508                                 es->s_state = cpu_to_le16(sbi->s_mount_state);
2509
2510                         /*
2511                          * We have to unlock super so that we can wait for
2512                          * transactions.
2513                          */
2514                         unlock_super(sb);
2515                         ext3_mark_recovery_complete(sb, es);
2516                         lock_super(sb);
2517                 } else {
2518                         __le32 ret;
2519                         if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2520                                         ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2521                                 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2522                                        "remount RDWR because of unsupported "
2523                                        "optional features (%x).\n",
2524                                        sb->s_id, le32_to_cpu(ret));
2525                                 err = -EROFS;
2526                                 goto restore_opts;
2527                         }
2528
2529                         /*
2530                          * If we have an unprocessed orphan list hanging
2531                          * around from a previously readonly bdev mount,
2532                          * require a full umount/remount for now.
2533                          */
2534                         if (es->s_last_orphan) {
2535                                 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2536                                        "remount RDWR because of unprocessed "
2537                                        "orphan inode list.  Please "
2538                                        "umount/remount instead.\n",
2539                                        sb->s_id);
2540                                 err = -EINVAL;
2541                                 goto restore_opts;
2542                         }
2543
2544                         /*
2545                          * Mounting a RDONLY partition read-write, so reread
2546                          * and store the current valid flag.  (It may have
2547                          * been changed by e2fsck since we originally mounted
2548                          * the partition.)
2549                          */
2550                         ext3_clear_journal_err(sb, es);
2551                         sbi->s_mount_state = le16_to_cpu(es->s_state);
2552                         if ((err = ext3_group_extend(sb, es, n_blocks_count)))
2553                                 goto restore_opts;
2554                         if (!ext3_setup_super (sb, es, 0))
2555                                 sb->s_flags &= ~MS_RDONLY;
2556                 }
2557         }
2558 #ifdef CONFIG_QUOTA
2559         /* Release old quota file names */
2560         for (i = 0; i < MAXQUOTAS; i++)
2561                 if (old_opts.s_qf_names[i] &&
2562                     old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2563                         kfree(old_opts.s_qf_names[i]);
2564 #endif
2565         return 0;
2566 restore_opts:
2567         sb->s_flags = old_sb_flags;
2568         sbi->s_mount_opt = old_opts.s_mount_opt;
2569         sbi->s_resuid = old_opts.s_resuid;
2570         sbi->s_resgid = old_opts.s_resgid;
2571         sbi->s_commit_interval = old_opts.s_commit_interval;
2572 #ifdef CONFIG_QUOTA
2573         sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2574         for (i = 0; i < MAXQUOTAS; i++) {
2575                 if (sbi->s_qf_names[i] &&
2576                     old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2577                         kfree(sbi->s_qf_names[i]);
2578                 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2579         }
2580 #endif
2581         return err;
2582 }
2583
2584 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
2585 {
2586         struct super_block *sb = dentry->d_sb;
2587         struct ext3_sb_info *sbi = EXT3_SB(sb);
2588         struct ext3_super_block *es = sbi->s_es;
2589         u64 fsid;
2590
2591         if (test_opt(sb, MINIX_DF)) {
2592                 sbi->s_overhead_last = 0;
2593         } else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
2594                 unsigned long ngroups = sbi->s_groups_count, i;
2595                 ext3_fsblk_t overhead = 0;
2596                 smp_rmb();
2597
2598                 /*
2599                  * Compute the overhead (FS structures).  This is constant
2600                  * for a given filesystem unless the number of block groups
2601                  * changes so we cache the previous value until it does.
2602                  */
2603
2604                 /*
2605                  * All of the blocks before first_data_block are
2606                  * overhead
2607                  */
2608                 overhead = le32_to_cpu(es->s_first_data_block);
2609
2610                 /*
2611                  * Add the overhead attributed to the superblock and
2612                  * block group descriptors.  If the sparse superblocks
2613                  * feature is turned on, then not all groups have this.
2614                  */
2615                 for (i = 0; i < ngroups; i++) {
2616                         overhead += ext3_bg_has_super(sb, i) +
2617                                 ext3_bg_num_gdb(sb, i);
2618                         cond_resched();
2619                 }
2620
2621                 /*
2622                  * Every block group has an inode bitmap, a block
2623                  * bitmap, and an inode table.
2624                  */
2625                 overhead += ngroups * (2 + sbi->s_itb_per_group);
2626                 sbi->s_overhead_last = overhead;
2627                 smp_wmb();
2628                 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
2629         }
2630
2631         buf->f_type = EXT3_SUPER_MAGIC;
2632         buf->f_bsize = sb->s_blocksize;
2633         buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
2634         buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
2635         es->s_free_blocks_count = cpu_to_le32(buf->f_bfree);
2636         buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2637         if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2638                 buf->f_bavail = 0;
2639         buf->f_files = le32_to_cpu(es->s_inodes_count);
2640         buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
2641         es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
2642         buf->f_namelen = EXT3_NAME_LEN;
2643         fsid = le64_to_cpup((void *)es->s_uuid) ^
2644                le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2645         buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2646         buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
2647         return 0;
2648 }
2649
2650 /* Helper function for writing quotas on sync - we need to start transaction before quota file
2651  * is locked for write. Otherwise the are possible deadlocks:
2652  * Process 1                         Process 2
2653  * ext3_create()                     quota_sync()
2654  *   journal_start()                   write_dquot()
2655  *   DQUOT_INIT()                        down(dqio_mutex)
2656  *     down(dqio_mutex)                    journal_start()
2657  *
2658  */
2659
2660 #ifdef CONFIG_QUOTA
2661
2662 static inline struct inode *dquot_to_inode(struct dquot *dquot)
2663 {
2664         return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2665 }
2666
2667 static int ext3_dquot_initialize(struct inode *inode, int type)
2668 {
2669         handle_t *handle;
2670         int ret, err;
2671
2672         /* We may create quota structure so we need to reserve enough blocks */
2673         handle = ext3_journal_start(inode, 2*EXT3_QUOTA_INIT_BLOCKS(inode->i_sb));
2674         if (IS_ERR(handle))
2675                 return PTR_ERR(handle);
2676         ret = dquot_initialize(inode, type);
2677         err = ext3_journal_stop(handle);
2678         if (!ret)
2679                 ret = err;
2680         return ret;
2681 }
2682
2683 static int ext3_dquot_drop(struct inode *inode)
2684 {
2685         handle_t *handle;
2686         int ret, err;
2687
2688         /* We may delete quota structure so we need to reserve enough blocks */
2689         handle = ext3_journal_start(inode, 2*EXT3_QUOTA_DEL_BLOCKS(inode->i_sb));
2690         if (IS_ERR(handle)) {
2691                 /*
2692                  * We call dquot_drop() anyway to at least release references
2693                  * to quota structures so that umount does not hang.
2694                  */
2695                 dquot_drop(inode);
2696                 return PTR_ERR(handle);
2697         }
2698         ret = dquot_drop(inode);
2699         err = ext3_journal_stop(handle);
2700         if (!ret)
2701                 ret = err;
2702         return ret;
2703 }
2704
2705 static int ext3_write_dquot(struct dquot *dquot)
2706 {
2707         int ret, err;
2708         handle_t *handle;
2709         struct inode *inode;
2710
2711         inode = dquot_to_inode(dquot);
2712         handle = ext3_journal_start(inode,
2713                                         EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2714         if (IS_ERR(handle))
2715                 return PTR_ERR(handle);
2716         ret = dquot_commit(dquot);
2717         err = ext3_journal_stop(handle);
2718         if (!ret)
2719                 ret = err;
2720         return ret;
2721 }
2722
2723 static int ext3_acquire_dquot(struct dquot *dquot)
2724 {
2725         int ret, err;
2726         handle_t *handle;
2727
2728         handle = ext3_journal_start(dquot_to_inode(dquot),
2729                                         EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2730         if (IS_ERR(handle))
2731                 return PTR_ERR(handle);
2732         ret = dquot_acquire(dquot);
2733         err = ext3_journal_stop(handle);
2734         if (!ret)
2735                 ret = err;
2736         return ret;
2737 }
2738
2739 static int ext3_release_dquot(struct dquot *dquot)
2740 {
2741         int ret, err;
2742         handle_t *handle;
2743
2744         handle = ext3_journal_start(dquot_to_inode(dquot),
2745                                         EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2746         if (IS_ERR(handle)) {
2747                 /* Release dquot anyway to avoid endless cycle in dqput() */
2748                 dquot_release(dquot);
2749                 return PTR_ERR(handle);
2750         }
2751         ret = dquot_release(dquot);
2752         err = ext3_journal_stop(handle);
2753         if (!ret)
2754                 ret = err;
2755         return ret;
2756 }
2757
2758 static int ext3_mark_dquot_dirty(struct dquot *dquot)
2759 {
2760         /* Are we journaling quotas? */
2761         if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2762             EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2763                 dquot_mark_dquot_dirty(dquot);
2764                 return ext3_write_dquot(dquot);
2765         } else {
2766                 return dquot_mark_dquot_dirty(dquot);
2767         }
2768 }
2769
2770 static int ext3_write_info(struct super_block *sb, int type)
2771 {
2772         int ret, err;
2773         handle_t *handle;
2774
2775         /* Data block + inode block */
2776         handle = ext3_journal_start(sb->s_root->d_inode, 2);
2777         if (IS_ERR(handle))
2778                 return PTR_ERR(handle);
2779         ret = dquot_commit_info(sb, type);
2780         err = ext3_journal_stop(handle);
2781         if (!ret)
2782                 ret = err;
2783         return ret;
2784 }
2785
2786 /*
2787  * Turn on quotas during mount time - we need to find
2788  * the quota file and such...
2789  */
2790 static int ext3_quota_on_mount(struct super_block *sb, int type)
2791 {
2792         return vfs_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2793                         EXT3_SB(sb)->s_jquota_fmt, type);
2794 }
2795
2796 /*
2797  * Standard function to be called on quota_on
2798  */
2799 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
2800                          char *name, int remount)
2801 {
2802         int err;
2803         struct path path;
2804
2805         if (!test_opt(sb, QUOTA))
2806                 return -EINVAL;
2807         /* When remounting, no checks are needed and in fact, name is NULL */
2808         if (remount)
2809                 return vfs_quota_on(sb, type, format_id, name, remount);
2810
2811         err = kern_path(name, LOOKUP_FOLLOW, &path);
2812         if (err)
2813                 return err;
2814
2815         /* Quotafile not on the same filesystem? */
2816         if (path.mnt->mnt_sb != sb) {
2817                 path_put(&path);
2818                 return -EXDEV;
2819         }
2820         /* Journaling quota? */
2821         if (EXT3_SB(sb)->s_qf_names[type]) {
2822                 /* Quotafile not of fs root? */
2823                 if (path.dentry->d_parent != sb->s_root)
2824                         printk(KERN_WARNING
2825                                 "EXT3-fs: Quota file not on filesystem root. "
2826                                 "Journaled quota will not work.\n");
2827         }
2828
2829         /*
2830          * When we journal data on quota file, we have to flush journal to see
2831          * all updates to the file when we bypass pagecache...
2832          */
2833         if (ext3_should_journal_data(path.dentry->d_inode)) {
2834                 /*
2835                  * We don't need to lock updates but journal_flush() could
2836                  * otherwise be livelocked...
2837                  */
2838                 journal_lock_updates(EXT3_SB(sb)->s_journal);
2839                 err = journal_flush(EXT3_SB(sb)->s_journal);
2840                 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2841                 if (err) {
2842                         path_put(&path);
2843                         return err;
2844                 }
2845         }
2846
2847         err = vfs_quota_on_path(sb, type, format_id, &path);
2848         path_put(&path);
2849         return err;
2850 }
2851
2852 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2853  * acquiring the locks... As quota files are never truncated and quota code
2854  * itself serializes the operations (and noone else should touch the files)
2855  * we don't have to be afraid of races */
2856 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2857                                size_t len, loff_t off)
2858 {
2859         struct inode *inode = sb_dqopt(sb)->files[type];
2860         sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2861         int err = 0;
2862         int offset = off & (sb->s_blocksize - 1);
2863         int tocopy;
2864         size_t toread;
2865         struct buffer_head *bh;
2866         loff_t i_size = i_size_read(inode);
2867
2868         if (off > i_size)
2869                 return 0;
2870         if (off+len > i_size)
2871                 len = i_size-off;
2872         toread = len;
2873         while (toread > 0) {
2874                 tocopy = sb->s_blocksize - offset < toread ?
2875                                 sb->s_blocksize - offset : toread;
2876                 bh = ext3_bread(NULL, inode, blk, 0, &err);
2877                 if (err)
2878                         return err;
2879                 if (!bh)        /* A hole? */
2880                         memset(data, 0, tocopy);
2881                 else
2882                         memcpy(data, bh->b_data+offset, tocopy);
2883                 brelse(bh);
2884                 offset = 0;
2885                 toread -= tocopy;
2886                 data += tocopy;
2887                 blk++;
2888         }
2889         return len;
2890 }
2891
2892 /* Write to quotafile (we know the transaction is already started and has
2893  * enough credits) */
2894 static ssize_t ext3_quota_write(struct super_block *sb, int type,
2895                                 const char *data, size_t len, loff_t off)
2896 {
2897         struct inode *inode = sb_dqopt(sb)->files[type];
2898         sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2899         int err = 0;
2900         int offset = off & (sb->s_blocksize - 1);
2901         int tocopy;
2902         int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
2903         size_t towrite = len;
2904         struct buffer_head *bh;
2905         handle_t *handle = journal_current_handle();
2906
2907         if (!handle) {
2908                 printk(KERN_WARNING "EXT3-fs: Quota write (off=%Lu, len=%Lu)"
2909                         " cancelled because transaction is not started.\n",
2910                         (unsigned long long)off, (unsigned long long)len);
2911                 return -EIO;
2912         }
2913         mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2914         while (towrite > 0) {
2915                 tocopy = sb->s_blocksize - offset < towrite ?
2916                                 sb->s_blocksize - offset : towrite;
2917                 bh = ext3_bread(handle, inode, blk, 1, &err);
2918                 if (!bh)
2919                         goto out;
2920                 if (journal_quota) {
2921                         err = ext3_journal_get_write_access(handle, bh);
2922                         if (err) {
2923                                 brelse(bh);
2924                                 goto out;
2925                         }
2926                 }
2927                 lock_buffer(bh);
2928                 memcpy(bh->b_data+offset, data, tocopy);
2929                 flush_dcache_page(bh->b_page);
2930                 unlock_buffer(bh);
2931                 if (journal_quota)
2932                         err = ext3_journal_dirty_metadata(handle, bh);
2933                 else {
2934                         /* Always do at least ordered writes for quotas */
2935                         err = ext3_journal_dirty_data(handle, bh);
2936                         mark_buffer_dirty(bh);
2937                 }
2938                 brelse(bh);
2939                 if (err)
2940                         goto out;
2941                 offset = 0;
2942                 towrite -= tocopy;
2943                 data += tocopy;
2944                 blk++;
2945         }
2946 out:
2947         if (len == towrite) {
2948                 mutex_unlock(&inode->i_mutex);
2949                 return err;
2950         }
2951         if (inode->i_size < off+len-towrite) {
2952                 i_size_write(inode, off+len-towrite);
2953                 EXT3_I(inode)->i_disksize = inode->i_size;
2954         }
2955         inode->i_version++;
2956         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2957         ext3_mark_inode_dirty(handle, inode);
2958         mutex_unlock(&inode->i_mutex);
2959         return len - towrite;
2960 }
2961
2962 #endif
2963
2964 static int ext3_get_sb(struct file_system_type *fs_type,
2965         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
2966 {
2967         return get_sb_bdev(fs_type, flags, dev_name, data, ext3_fill_super, mnt);
2968 }
2969
2970 static struct file_system_type ext3_fs_type = {
2971         .owner          = THIS_MODULE,
2972         .name           = "ext3",
2973         .get_sb         = ext3_get_sb,
2974         .kill_sb        = kill_block_super,
2975         .fs_flags       = FS_REQUIRES_DEV,
2976 };
2977
2978 static int __init init_ext3_fs(void)
2979 {
2980         int err = init_ext3_xattr();
2981         if (err)
2982                 return err;
2983         err = init_inodecache();
2984         if (err)
2985                 goto out1;
2986         err = register_filesystem(&ext3_fs_type);
2987         if (err)
2988                 goto out;
2989         return 0;
2990 out:
2991         destroy_inodecache();
2992 out1:
2993         exit_ext3_xattr();
2994         return err;
2995 }
2996
2997 static void __exit exit_ext3_fs(void)
2998 {
2999         unregister_filesystem(&ext3_fs_type);
3000         destroy_inodecache();
3001         exit_ext3_xattr();
3002 }
3003
3004 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
3005 MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
3006 MODULE_LICENSE("GPL");
3007 module_init(init_ext3_fs)
3008 module_exit(exit_ext3_fs)