fs/ext3/super.c

   1 /*
   2  *  linux/fs/ext3/super.c
   3  *
   4  * Copyright (C) 1992, 1993, 1994, 1995
   5  * Remy Card (card@masi.ibp.fr)
   6  * Laboratoire MASI - Institut Blaise Pascal
   7  * Universite Pierre et Marie Curie (Paris VI)
   8  *
   9  *  from
  10  *
  11  *  linux/fs/minix/inode.c
  12  *
  13  *  Copyright (C) 1991, 1992  Linus Torvalds
  14  *
  15  *  Big-endian to little-endian byte-swapping/bitmaps by
  16  *        David S. Miller (davem@caip.rutgers.edu), 1995
  17  */
  18
  19 #include <linux/module.h>
  20 #include <linux/string.h>
  21 #include <linux/fs.h>
  22 #include <linux/time.h>
  23 #include <linux/jbd.h>
  24 #include <linux/ext3_fs.h>
  25 #include <linux/ext3_jbd.h>
  26 #include <linux/slab.h>
  27 #include <linux/init.h>
  28 #include <linux/blkdev.h>
  29 #include <linux/parser.h>
  30 #include <linux/smp_lock.h>
  31 #include <linux/buffer_head.h>
  32 #include <linux/exportfs.h>
  33 #include <linux/vfs.h>
  34 #include <linux/random.h>
  35 #include <linux/mount.h>
  36 #include <linux/namei.h>
  37 #include <linux/quotaops.h>
  38 #include <linux/seq_file.h>
  39 #include <linux/log2.h>
  40
  41 #include <asm/uaccess.h>
  42
  43 #include "xattr.h"
  44 #include "acl.h"
  45 #include "namei.h"
  46
  47 #ifdef CONFIG_EXT3_DEFAULTS_TO_ORDERED
  48   #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_ORDERED_DATA
  49 #else
  50   #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_WRITEBACK_DATA
  51 #endif
  52
  53 static int ext3_load_journal(struct super_block *, struct ext3_super_block *,
  54                              unsigned long journal_devnum);
  55 static int ext3_create_journal(struct super_block *, struct ext3_super_block *,
  56                                unsigned int);
  57 static int ext3_commit_super(struct super_block *sb,
  58                                struct ext3_super_block *es,
  59                                int sync);
  60 static void ext3_mark_recovery_complete(struct super_block * sb,
  61                                         struct ext3_super_block * es);
  62 static void ext3_clear_journal_err(struct super_block * sb,
  63                                    struct ext3_super_block * es);
  64 static int ext3_sync_fs(struct super_block *sb, int wait);
  65 static const char *ext3_decode_error(struct super_block * sb, int errno,
  66                                      char nbuf[16]);
  67 static int ext3_remount (struct super_block * sb, int * flags, char * data);
  68 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf);
  69 static int ext3_unfreeze(struct super_block *sb);
  70 static int ext3_freeze(struct super_block *sb);
  71
  72 /*
  73  * Wrappers for journal_start/end.
  74  *
  75  * The only special thing we need to do here is to make sure that all
  76  * journal_end calls result in the superblock being marked dirty, so
  77  * that sync() will call the filesystem's write_super callback if
  78  * appropriate.
  79  */
  80 handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks)
  81 {
  82         journal_t *journal;
  83
  84         if (sb->s_flags & MS_RDONLY)
  85                 return ERR_PTR(-EROFS);
  86
  87         /* Special case here: if the journal has aborted behind our
  88          * backs (eg. EIO in the commit thread), then we still need to
  89          * take the FS itself readonly cleanly. */
  90         journal = EXT3_SB(sb)->s_journal;
  91         if (is_journal_aborted(journal)) {
  92                 ext3_abort(sb, __func__,
  93                            "Detected aborted journal");
  94                 return ERR_PTR(-EROFS);
  95         }
  96
  97         return journal_start(journal, nblocks);
  98 }
  99
 100 /*
 101  * The only special thing we need to do here is to make sure that all
 102  * journal_stop calls result in the superblock being marked dirty, so
 103  * that sync() will call the filesystem's write_super callback if
 104  * appropriate.
 105  */
 106 int __ext3_journal_stop(const char *where, handle_t *handle)
 107 {
 108         struct super_block *sb;
 109         int err;
 110         int rc;
 111
 112         sb = handle->h_transaction->t_journal->j_private;
 113         err = handle->h_err;
 114         rc = journal_stop(handle);
 115
 116         if (!err)
 117                 err = rc;
 118         if (err)
 119                 __ext3_std_error(sb, where, err);
 120         return err;
 121 }
 122
 123 void ext3_journal_abort_handle(const char *caller, const char *err_fn,
 124                 struct buffer_head *bh, handle_t *handle, int err)
 125 {
 126         char nbuf[16];
 127         const char *errstr = ext3_decode_error(NULL, err, nbuf);
 128
 129         if (bh)
 130                 BUFFER_TRACE(bh, "abort");
 131
 132         if (!handle->h_err)
 133                 handle->h_err = err;
 134
 135         if (is_handle_aborted(handle))
 136                 return;
 137
 138         printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
 139                caller, errstr, err_fn);
 140
 141         journal_abort_handle(handle);
 142 }
 143
 144 /* Deal with the reporting of failure conditions on a filesystem such as
 145  * inconsistencies detected or read IO failures.
 146  *
 147  * On ext2, we can store the error state of the filesystem in the
 148  * superblock.  That is not possible on ext3, because we may have other
 149  * write ordering constraints on the superblock which prevent us from
 150  * writing it out straight away; and given that the journal is about to
 151  * be aborted, we can't rely on the current, or future, transactions to
 152  * write out the superblock safely.
 153  *
 154  * We'll just use the journal_abort() error code to record an error in
 155  * the journal instead.  On recovery, the journal will compain about
 156  * that error until we've noted it down and cleared it.
 157  */
 158
 159 static void ext3_handle_error(struct super_block *sb)
 160 {
 161         struct ext3_super_block *es = EXT3_SB(sb)->s_es;
 162
 163         EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
 164         es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
 165
 166         if (sb->s_flags & MS_RDONLY)
 167                 return;
 168
 169         if (!test_opt (sb, ERRORS_CONT)) {
 170                 journal_t *journal = EXT3_SB(sb)->s_journal;
 171
 172                 EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
 173                 if (journal)
 174                         journal_abort(journal, -EIO);
 175         }
 176         if (test_opt (sb, ERRORS_RO)) {
 177                 printk (KERN_CRIT "Remounting filesystem read-only\n");
 178                 sb->s_flags |= MS_RDONLY;
 179         }
 180         ext3_commit_super(sb, es, 1);
 181         if (test_opt(sb, ERRORS_PANIC))
 182                 panic("EXT3-fs (device %s): panic forced after error\n",
 183                         sb->s_id);
 184 }
 185
 186 void ext3_error (struct super_block * sb, const char * function,
 187                  const char * fmt, ...)
 188 {
 189         va_list args;
 190
 191         va_start(args, fmt);
 192         printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
 193         vprintk(fmt, args);
 194         printk("\n");
 195         va_end(args);
 196
 197         ext3_handle_error(sb);
 198 }
 199
 200 static const char *ext3_decode_error(struct super_block * sb, int errno,
 201                                      char nbuf[16])
 202 {
 203         char *errstr = NULL;
 204
 205         switch (errno) {
 206         case -EIO:
 207                 errstr = "IO failure";
 208                 break;
 209         case -ENOMEM:
 210                 errstr = "Out of memory";
 211                 break;
 212         case -EROFS:
 213                 if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT)
 214                         errstr = "Journal has aborted";
 215                 else
 216                         errstr = "Readonly filesystem";
 217                 break;
 218         default:
 219                 /* If the caller passed in an extra buffer for unknown
 220                  * errors, textualise them now.  Else we just return
 221                  * NULL. */
 222                 if (nbuf) {
 223                         /* Check for truncated error codes... */
 224                         if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
 225                                 errstr = nbuf;
 226                 }
 227                 break;
 228         }
 229
 230         return errstr;
 231 }
 232
 233 /* __ext3_std_error decodes expected errors from journaling functions
 234  * automatically and invokes the appropriate error response.  */
 235
 236 void __ext3_std_error (struct super_block * sb, const char * function,
 237                        int errno)
 238 {
 239         char nbuf[16];
 240         const char *errstr;
 241
 242         /* Special case: if the error is EROFS, and we're not already
 243          * inside a transaction, then there's really no point in logging
 244          * an error. */
 245         if (errno == -EROFS && journal_current_handle() == NULL &&
 246             (sb->s_flags & MS_RDONLY))
 247                 return;
 248
 249         errstr = ext3_decode_error(sb, errno, nbuf);
 250         printk (KERN_CRIT "EXT3-fs error (device %s) in %s: %s\n",
 251                 sb->s_id, function, errstr);
 252
 253         ext3_handle_error(sb);
 254 }
 255
 256 /*
 257  * ext3_abort is a much stronger failure handler than ext3_error.  The
 258  * abort function may be used to deal with unrecoverable failures such
 259  * as journal IO errors or ENOMEM at a critical moment in log management.
 260  *
 261  * We unconditionally force the filesystem into an ABORT|READONLY state,
 262  * unless the error response on the fs has been set to panic in which
 263  * case we take the easy way out and panic immediately.
 264  */
 265
 266 void ext3_abort (struct super_block * sb, const char * function,
 267                  const char * fmt, ...)
 268 {
 269         va_list args;
 270
 271         printk (KERN_CRIT "ext3_abort called.\n");
 272
 273         va_start(args, fmt);
 274         printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
 275         vprintk(fmt, args);
 276         printk("\n");
 277         va_end(args);
 278
 279         if (test_opt(sb, ERRORS_PANIC))
 280                 panic("EXT3-fs panic from previous error\n");
 281
 282         if (sb->s_flags & MS_RDONLY)
 283                 return;
 284
 285         printk(KERN_CRIT "Remounting filesystem read-only\n");
 286         EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
 287         sb->s_flags |= MS_RDONLY;
 288         EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
 289         if (EXT3_SB(sb)->s_journal)
 290                 journal_abort(EXT3_SB(sb)->s_journal, -EIO);
 291 }
 292
 293 void ext3_warning (struct super_block * sb, const char * function,
 294                    const char * fmt, ...)
 295 {
 296         va_list args;
 297
 298         va_start(args, fmt);
 299         printk(KERN_WARNING "EXT3-fs warning (device %s): %s: ",
 300                sb->s_id, function);
 301         vprintk(fmt, args);
 302         printk("\n");
 303         va_end(args);
 304 }
 305
 306 void ext3_update_dynamic_rev(struct super_block *sb)
 307 {
 308         struct ext3_super_block *es = EXT3_SB(sb)->s_es;
 309
 310         if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
 311                 return;
 312
 313         ext3_warning(sb, __func__,
 314                      "updating to rev %d because of new feature flag, "
 315                      "running e2fsck is recommended",
 316                      EXT3_DYNAMIC_REV);
 317
 318         es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO);
 319         es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE);
 320         es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV);
 321         /* leave es->s_feature_*compat flags alone */
 322         /* es->s_uuid will be set by e2fsck if empty */
 323
 324         /*
 325          * The rest of the superblock fields should be zero, and if not it
 326          * means they are likely already in use, so leave them alone.  We
 327          * can leave it up to e2fsck to clean up any inconsistencies there.
 328          */
 329 }
 330
 331 /*
 332  * Open the external journal device
 333  */
 334 static struct block_device *ext3_blkdev_get(dev_t dev)
 335 {
 336         struct block_device *bdev;
 337         char b[BDEVNAME_SIZE];
 338
 339         bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
 340         if (IS_ERR(bdev))
 341                 goto fail;
 342         return bdev;
 343
 344 fail:
 345         printk(KERN_ERR "EXT3: failed to open journal device %s: %ld\n",
 346                         __bdevname(dev, b), PTR_ERR(bdev));
 347         return NULL;
 348 }
 349
 350 /*
 351  * Release the journal device
 352  */
 353 static int ext3_blkdev_put(struct block_device *bdev)
 354 {
 355         bd_release(bdev);
 356         return blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
 357 }
 358
 359 static int ext3_blkdev_remove(struct ext3_sb_info *sbi)
 360 {
 361         struct block_device *bdev;
 362         int ret = -ENODEV;
 363
 364         bdev = sbi->journal_bdev;
 365         if (bdev) {
 366                 ret = ext3_blkdev_put(bdev);
 367                 sbi->journal_bdev = NULL;
 368         }
 369         return ret;
 370 }
 371
 372 static inline struct inode *orphan_list_entry(struct list_head *l)
 373 {
 374         return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
 375 }
 376
 377 static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
 378 {
 379         struct list_head *l;
 380
 381         printk(KERN_ERR "sb orphan head is %d\n",
 382                le32_to_cpu(sbi->s_es->s_last_orphan));
 383
 384         printk(KERN_ERR "sb_info orphan list:\n");
 385         list_for_each(l, &sbi->s_orphan) {
 386                 struct inode *inode = orphan_list_entry(l);
 387                 printk(KERN_ERR "  "
 388                        "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
 389                        inode->i_sb->s_id, inode->i_ino, inode,
 390                        inode->i_mode, inode->i_nlink,
 391                        NEXT_ORPHAN(inode));
 392         }
 393 }
 394
 395 static void ext3_put_super (struct super_block * sb)
 396 {
 397         struct ext3_sb_info *sbi = EXT3_SB(sb);
 398         struct ext3_super_block *es = sbi->s_es;
 399         int i, err;
 400
 401         lock_kernel();
 402
 403         ext3_xattr_put_super(sb);
 404         err = journal_destroy(sbi->s_journal);
 405         sbi->s_journal = NULL;
 406         if (err < 0)
 407                 ext3_abort(sb, __func__, "Couldn't clean up the journal");
 408
 409         if (!(sb->s_flags & MS_RDONLY)) {
 410                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
 411                 es->s_state = cpu_to_le16(sbi->s_mount_state);
 412                 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
 413                 mark_buffer_dirty(sbi->s_sbh);
 414                 ext3_commit_super(sb, es, 1);
 415         }
 416
 417         for (i = 0; i < sbi->s_gdb_count; i++)
 418                 brelse(sbi->s_group_desc[i]);
 419         kfree(sbi->s_group_desc);
 420         percpu_counter_destroy(&sbi->s_freeblocks_counter);
 421         percpu_counter_destroy(&sbi->s_freeinodes_counter);
 422         percpu_counter_destroy(&sbi->s_dirs_counter);
 423         brelse(sbi->s_sbh);
 424 #ifdef CONFIG_QUOTA
 425         for (i = 0; i < MAXQUOTAS; i++)
 426                 kfree(sbi->s_qf_names[i]);
 427 #endif
 428
 429         /* Debugging code just in case the in-memory inode orphan list
 430          * isn't empty.  The on-disk one can be non-empty if we've
 431          * detected an error and taken the fs readonly, but the
 432          * in-memory list had better be clean by this point. */
 433         if (!list_empty(&sbi->s_orphan))
 434                 dump_orphan_list(sb, sbi);
 435         J_ASSERT(list_empty(&sbi->s_orphan));
 436
 437         invalidate_bdev(sb->s_bdev);
 438         if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
 439                 /*
 440                  * Invalidate the journal device's buffers.  We don't want them
 441                  * floating about in memory - the physical journal device may
 442                  * hotswapped, and it breaks the `ro-after' testing code.
 443                  */
 444                 sync_blockdev(sbi->journal_bdev);
 445                 invalidate_bdev(sbi->journal_bdev);
 446                 ext3_blkdev_remove(sbi);
 447         }
 448         sb->s_fs_info = NULL;
 449         kfree(sbi->s_blockgroup_lock);
 450         kfree(sbi);
 451
 452         unlock_kernel();
 453 }
 454
 455 static struct kmem_cache *ext3_inode_cachep;
 456
 457 /*
 458  * Called inside transaction, so use GFP_NOFS
 459  */
 460 static struct inode *ext3_alloc_inode(struct super_block *sb)
 461 {
 462         struct ext3_inode_info *ei;
 463
 464         ei = kmem_cache_alloc(ext3_inode_cachep, GFP_NOFS);
 465         if (!ei)
 466                 return NULL;
 467 #ifdef CONFIG_EXT3_FS_POSIX_ACL
 468         ei->i_acl = EXT3_ACL_NOT_CACHED;
 469         ei->i_default_acl = EXT3_ACL_NOT_CACHED;
 470 #endif
 471         ei->i_block_alloc_info = NULL;
 472         ei->vfs_inode.i_version = 1;
 473         return &ei->vfs_inode;
 474 }
 475
 476 static void ext3_destroy_inode(struct inode *inode)
 477 {
 478         if (!list_empty(&(EXT3_I(inode)->i_orphan))) {
 479                 printk("EXT3 Inode %p: orphan list check failed!\n",
 480                         EXT3_I(inode));
 481                 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
 482                                 EXT3_I(inode), sizeof(struct ext3_inode_info),
 483                                 false);
 484                 dump_stack();
 485         }
 486         kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
 487 }
 488
 489 static void init_once(void *foo)
 490 {
 491         struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
 492
 493         INIT_LIST_HEAD(&ei->i_orphan);
 494 #ifdef CONFIG_EXT3_FS_XATTR
 495         init_rwsem(&ei->xattr_sem);
 496 #endif
 497         mutex_init(&ei->truncate_mutex);
 498         inode_init_once(&ei->vfs_inode);
 499 }
 500
 501 static int init_inodecache(void)
 502 {
 503         ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
 504                                              sizeof(struct ext3_inode_info),
 505                                              0, (SLAB_RECLAIM_ACCOUNT|
 506                                                 SLAB_MEM_SPREAD),
 507                                              init_once);
 508         if (ext3_inode_cachep == NULL)
 509                 return -ENOMEM;
 510         return 0;
 511 }
 512
 513 static void destroy_inodecache(void)
 514 {
 515         kmem_cache_destroy(ext3_inode_cachep);
 516 }
 517
 518 static void ext3_clear_inode(struct inode *inode)
 519 {
 520         struct ext3_block_alloc_info *rsv = EXT3_I(inode)->i_block_alloc_info;
 521 #ifdef CONFIG_EXT3_FS_POSIX_ACL
 522         if (EXT3_I(inode)->i_acl &&
 523                         EXT3_I(inode)->i_acl != EXT3_ACL_NOT_CACHED) {
 524                 posix_acl_release(EXT3_I(inode)->i_acl);
 525                 EXT3_I(inode)->i_acl = EXT3_ACL_NOT_CACHED;
 526         }
 527         if (EXT3_I(inode)->i_default_acl &&
 528                         EXT3_I(inode)->i_default_acl != EXT3_ACL_NOT_CACHED) {
 529                 posix_acl_release(EXT3_I(inode)->i_default_acl);
 530                 EXT3_I(inode)->i_default_acl = EXT3_ACL_NOT_CACHED;
 531         }
 532 #endif
 533         ext3_discard_reservation(inode);
 534         EXT3_I(inode)->i_block_alloc_info = NULL;
 535         if (unlikely(rsv))
 536                 kfree(rsv);
 537 }
 538
 539 static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
 540 {
 541 #if defined(CONFIG_QUOTA)
 542         struct ext3_sb_info *sbi = EXT3_SB(sb);
 543
 544         if (sbi->s_jquota_fmt)
 545                 seq_printf(seq, ",jqfmt=%s",
 546                 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0");
 547
 548         if (sbi->s_qf_names[USRQUOTA])
 549                 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
 550
 551         if (sbi->s_qf_names[GRPQUOTA])
 552                 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
 553
 554         if (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA)
 555                 seq_puts(seq, ",usrquota");
 556
 557         if (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)
 558                 seq_puts(seq, ",grpquota");
 559 #endif
 560 }
 561
 562 /*
 563  * Show an option if
 564  *  - it's set to a non-default value OR
 565  *  - if the per-sb default is different from the global default
 566  */
 567 static int ext3_show_options(struct seq_file *seq, struct vfsmount *vfs)
 568 {
 569         struct super_block *sb = vfs->mnt_sb;
 570         struct ext3_sb_info *sbi = EXT3_SB(sb);
 571         struct ext3_super_block *es = sbi->s_es;
 572         unsigned long def_mount_opts;
 573
 574         def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
 575
 576         if (sbi->s_sb_block != 1)
 577                 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
 578         if (test_opt(sb, MINIX_DF))
 579                 seq_puts(seq, ",minixdf");
 580         if (test_opt(sb, GRPID))
 581                 seq_puts(seq, ",grpid");
 582         if (!test_opt(sb, GRPID) && (def_mount_opts & EXT3_DEFM_BSDGROUPS))
 583                 seq_puts(seq, ",nogrpid");
 584         if (sbi->s_resuid != EXT3_DEF_RESUID ||
 585             le16_to_cpu(es->s_def_resuid) != EXT3_DEF_RESUID) {
 586                 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
 587         }
 588         if (sbi->s_resgid != EXT3_DEF_RESGID ||
 589             le16_to_cpu(es->s_def_resgid) != EXT3_DEF_RESGID) {
 590                 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
 591         }
 592         if (test_opt(sb, ERRORS_RO)) {
 593                 int def_errors = le16_to_cpu(es->s_errors);
 594
 595                 if (def_errors == EXT3_ERRORS_PANIC ||
 596                     def_errors == EXT3_ERRORS_CONTINUE) {
 597                         seq_puts(seq, ",errors=remount-ro");
 598                 }
 599         }
 600         if (test_opt(sb, ERRORS_CONT))
 601                 seq_puts(seq, ",errors=continue");
 602         if (test_opt(sb, ERRORS_PANIC))
 603                 seq_puts(seq, ",errors=panic");
 604         if (test_opt(sb, NO_UID32))
 605                 seq_puts(seq, ",nouid32");
 606         if (test_opt(sb, DEBUG))
 607                 seq_puts(seq, ",debug");
 608         if (test_opt(sb, OLDALLOC))
 609                 seq_puts(seq, ",oldalloc");
 610 #ifdef CONFIG_EXT3_FS_XATTR
 611         if (test_opt(sb, XATTR_USER))
 612                 seq_puts(seq, ",user_xattr");
 613         if (!test_opt(sb, XATTR_USER) &&
 614             (def_mount_opts & EXT3_DEFM_XATTR_USER)) {
 615                 seq_puts(seq, ",nouser_xattr");
 616         }
 617 #endif
 618 #ifdef CONFIG_EXT3_FS_POSIX_ACL
 619         if (test_opt(sb, POSIX_ACL))
 620                 seq_puts(seq, ",acl");
 621         if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT3_DEFM_ACL))
 622                 seq_puts(seq, ",noacl");
 623 #endif
 624         if (!test_opt(sb, RESERVATION))
 625                 seq_puts(seq, ",noreservation");
 626         if (sbi->s_commit_interval) {
 627                 seq_printf(seq, ",commit=%u",
 628                            (unsigned) (sbi->s_commit_interval / HZ));
 629         }
 630         if (test_opt(sb, BARRIER))
 631                 seq_puts(seq, ",barrier=1");
 632         if (test_opt(sb, NOBH))
 633                 seq_puts(seq, ",nobh");
 634
 635         if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA)
 636                 seq_puts(seq, ",data=journal");
 637         else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA)
 638                 seq_puts(seq, ",data=ordered");
 639         else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)
 640                 seq_puts(seq, ",data=writeback");
 641
 642         if (test_opt(sb, DATA_ERR_ABORT))
 643                 seq_puts(seq, ",data_err=abort");
 644
 645         ext3_show_quota_options(seq, sb);
 646
 647         return 0;
 648 }
 649
 650
 651 static struct inode *ext3_nfs_get_inode(struct super_block *sb,
 652                 u64 ino, u32 generation)
 653 {
 654         struct inode *inode;
 655
 656         if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO)
 657                 return ERR_PTR(-ESTALE);
 658         if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count))
 659                 return ERR_PTR(-ESTALE);
 660
 661         /* iget isn't really right if the inode is currently unallocated!!
 662          *
 663          * ext3_read_inode will return a bad_inode if the inode had been
 664          * deleted, so we should be safe.
 665          *
 666          * Currently we don't know the generation for parent directory, so
 667          * a generation of 0 means "accept any"
 668          */
 669         inode = ext3_iget(sb, ino);
 670         if (IS_ERR(inode))
 671                 return ERR_CAST(inode);
 672         if (generation && inode->i_generation != generation) {
 673                 iput(inode);
 674                 return ERR_PTR(-ESTALE);
 675         }
 676
 677         return inode;
 678 }
 679
 680 static struct dentry *ext3_fh_to_dentry(struct super_block *sb, struct fid *fid,
 681                 int fh_len, int fh_type)
 682 {
 683         return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
 684                                     ext3_nfs_get_inode);
 685 }
 686
 687 static struct dentry *ext3_fh_to_parent(struct super_block *sb, struct fid *fid,
 688                 int fh_len, int fh_type)
 689 {
 690         return generic_fh_to_parent(sb, fid, fh_len, fh_type,
 691                                     ext3_nfs_get_inode);
 692 }
 693
 694 /*
 695  * Try to release metadata pages (indirect blocks, directories) which are
 696  * mapped via the block device.  Since these pages could have journal heads
 697  * which would prevent try_to_free_buffers() from freeing them, we must use
 698  * jbd layer's try_to_free_buffers() function to release them.
 699  */
 700 static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
 701                                  gfp_t wait)
 702 {
 703         journal_t *journal = EXT3_SB(sb)->s_journal;
 704
 705         WARN_ON(PageChecked(page));
 706         if (!page_has_buffers(page))
 707                 return 0;
 708         if (journal)
 709                 return journal_try_to_free_buffers(journal, page,
 710                                                    wait & ~__GFP_WAIT);
 711         return try_to_free_buffers(page);
 712 }
 713
 714 #ifdef CONFIG_QUOTA
 715 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
 716 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
 717
 718 static int ext3_write_dquot(struct dquot *dquot);
 719 static int ext3_acquire_dquot(struct dquot *dquot);
 720 static int ext3_release_dquot(struct dquot *dquot);
 721 static int ext3_mark_dquot_dirty(struct dquot *dquot);
 722 static int ext3_write_info(struct super_block *sb, int type);
 723 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
 724                                 char *path, int remount);
 725 static int ext3_quota_on_mount(struct super_block *sb, int type);
 726 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
 727                                size_t len, loff_t off);
 728 static ssize_t ext3_quota_write(struct super_block *sb, int type,
 729                                 const char *data, size_t len, loff_t off);
 730
 731 static struct dquot_operations ext3_quota_operations = {
 732         .initialize     = dquot_initialize,
 733         .drop           = dquot_drop,
 734         .alloc_space    = dquot_alloc_space,
 735         .alloc_inode    = dquot_alloc_inode,
 736         .free_space     = dquot_free_space,
 737         .free_inode     = dquot_free_inode,
 738         .transfer       = dquot_transfer,
 739         .write_dquot    = ext3_write_dquot,
 740         .acquire_dquot  = ext3_acquire_dquot,
 741         .release_dquot  = ext3_release_dquot,
 742         .mark_dirty     = ext3_mark_dquot_dirty,
 743         .write_info     = ext3_write_info,
 744         .alloc_dquot    = dquot_alloc,
 745         .destroy_dquot  = dquot_destroy,
 746 };
 747
 748 static struct quotactl_ops ext3_qctl_operations = {
 749         .quota_on       = ext3_quota_on,
 750         .quota_off      = vfs_quota_off,
 751         .quota_sync     = vfs_quota_sync,
 752         .get_info       = vfs_get_dqinfo,
 753         .set_info       = vfs_set_dqinfo,
 754         .get_dqblk      = vfs_get_dqblk,
 755         .set_dqblk      = vfs_set_dqblk
 756 };
 757 #endif
 758
 759 static const struct super_operations ext3_sops = {
 760         .alloc_inode    = ext3_alloc_inode,
 761         .destroy_inode  = ext3_destroy_inode,
 762         .write_inode    = ext3_write_inode,
 763         .dirty_inode    = ext3_dirty_inode,
 764         .delete_inode   = ext3_delete_inode,
 765         .put_super      = ext3_put_super,
 766         .sync_fs        = ext3_sync_fs,
 767         .freeze_fs      = ext3_freeze,
 768         .unfreeze_fs    = ext3_unfreeze,
 769         .statfs         = ext3_statfs,
 770         .remount_fs     = ext3_remount,
 771         .clear_inode    = ext3_clear_inode,
 772         .show_options   = ext3_show_options,
 773 #ifdef CONFIG_QUOTA
 774         .quota_read     = ext3_quota_read,
 775         .quota_write    = ext3_quota_write,
 776 #endif
 777         .bdev_try_to_free_page = bdev_try_to_free_page,
 778 };
 779
 780 static const struct export_operations ext3_export_ops = {
 781         .fh_to_dentry = ext3_fh_to_dentry,
 782         .fh_to_parent = ext3_fh_to_parent,
 783         .get_parent = ext3_get_parent,
 784 };
 785
 786 enum {
 787         Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
 788         Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
 789         Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
 790         Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
 791         Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
 792         Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
 793         Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
 794         Opt_data_err_abort, Opt_data_err_ignore,
 795         Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
 796         Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
 797         Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
 798         Opt_grpquota
 799 };
 800
 801 static const match_table_t tokens = {
 802         {Opt_bsd_df, "bsddf"},
 803         {Opt_minix_df, "minixdf"},
 804         {Opt_grpid, "grpid"},
 805         {Opt_grpid, "bsdgroups"},
 806         {Opt_nogrpid, "nogrpid"},
 807         {Opt_nogrpid, "sysvgroups"},
 808         {Opt_resgid, "resgid=%u"},
 809         {Opt_resuid, "resuid=%u"},
 810         {Opt_sb, "sb=%u"},
 811         {Opt_err_cont, "errors=continue"},
 812         {Opt_err_panic, "errors=panic"},
 813         {Opt_err_ro, "errors=remount-ro"},
 814         {Opt_nouid32, "nouid32"},
 815         {Opt_nocheck, "nocheck"},
 816         {Opt_nocheck, "check=none"},
 817         {Opt_debug, "debug"},
 818         {Opt_oldalloc, "oldalloc"},
 819         {Opt_orlov, "orlov"},
 820         {Opt_user_xattr, "user_xattr"},
 821         {Opt_nouser_xattr, "nouser_xattr"},
 822         {Opt_acl, "acl"},
 823         {Opt_noacl, "noacl"},
 824         {Opt_reservation, "reservation"},
 825         {Opt_noreservation, "noreservation"},
 826         {Opt_noload, "noload"},
 827         {Opt_nobh, "nobh"},
 828         {Opt_bh, "bh"},
 829         {Opt_commit, "commit=%u"},
 830         {Opt_journal_update, "journal=update"},
 831         {Opt_journal_inum, "journal=%u"},
 832         {Opt_journal_dev, "journal_dev=%u"},
 833         {Opt_abort, "abort"},
 834         {Opt_data_journal, "data=journal"},
 835         {Opt_data_ordered, "data=ordered"},
 836         {Opt_data_writeback, "data=writeback"},
 837         {Opt_data_err_abort, "data_err=abort"},
 838         {Opt_data_err_ignore, "data_err=ignore"},
 839         {Opt_offusrjquota, "usrjquota="},
 840         {Opt_usrjquota, "usrjquota=%s"},
 841         {Opt_offgrpjquota, "grpjquota="},
 842         {Opt_grpjquota, "grpjquota=%s"},
 843         {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
 844         {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
 845         {Opt_grpquota, "grpquota"},
 846         {Opt_noquota, "noquota"},
 847         {Opt_quota, "quota"},
 848         {Opt_usrquota, "usrquota"},
 849         {Opt_barrier, "barrier=%u"},
 850         {Opt_resize, "resize"},
 851         {Opt_err, NULL},
 852 };
 853
 854 static ext3_fsblk_t get_sb_block(void **data)
 855 {
 856         ext3_fsblk_t    sb_block;
 857         char            *options = (char *) *data;
 858
 859         if (!options || strncmp(options, "sb=", 3) != 0)
 860                 return 1;       /* Default location */
 861         options += 3;
 862         /*todo: use simple_strtoll with >32bit ext3 */
 863         sb_block = simple_strtoul(options, &options, 0);
 864         if (*options && *options != ',') {
 865                 printk("EXT3-fs: Invalid sb specification: %s\n",
 866                        (char *) *data);
 867                 return 1;
 868         }
 869         if (*options == ',')
 870                 options++;
 871         *data = (void *) options;
 872         return sb_block;
 873 }
 874
 875 static int parse_options (char *options, struct super_block *sb,
 876                           unsigned int *inum, unsigned long *journal_devnum,
 877                           ext3_fsblk_t *n_blocks_count, int is_remount)
 878 {
 879         struct ext3_sb_info *sbi = EXT3_SB(sb);
 880         char * p;
 881         substring_t args[MAX_OPT_ARGS];
 882         int data_opt = 0;
 883         int option;
 884 #ifdef CONFIG_QUOTA
 885         int qtype, qfmt;
 886         char *qname;
 887 #endif
 888
 889         if (!options)
 890                 return 1;
 891
 892         while ((p = strsep (&options, ",")) != NULL) {
 893                 int token;
 894                 if (!*p)
 895                         continue;
 896
 897                 token = match_token(p, tokens, args);
 898                 switch (token) {
 899                 case Opt_bsd_df:
 900                         clear_opt (sbi->s_mount_opt, MINIX_DF);
 901                         break;
 902                 case Opt_minix_df:
 903                         set_opt (sbi->s_mount_opt, MINIX_DF);
 904                         break;
 905                 case Opt_grpid:
 906                         set_opt (sbi->s_mount_opt, GRPID);
 907                         break;
 908                 case Opt_nogrpid:
 909                         clear_opt (sbi->s_mount_opt, GRPID);
 910                         break;
 911                 case Opt_resuid:
 912                         if (match_int(&args[0], &option))
 913                                 return 0;
 914                         sbi->s_resuid = option;
 915                         break;
 916                 case Opt_resgid:
 917                         if (match_int(&args[0], &option))
 918                                 return 0;
 919                         sbi->s_resgid = option;
 920                         break;
 921                 case Opt_sb:
 922                         /* handled by get_sb_block() instead of here */
 923                         /* *sb_block = match_int(&args[0]); */
 924                         break;
 925                 case Opt_err_panic:
 926                         clear_opt (sbi->s_mount_opt, ERRORS_CONT);
 927                         clear_opt (sbi->s_mount_opt, ERRORS_RO);
 928                         set_opt (sbi->s_mount_opt, ERRORS_PANIC);
 929                         break;
 930                 case Opt_err_ro:
 931                         clear_opt (sbi->s_mount_opt, ERRORS_CONT);
 932                         clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
 933                         set_opt (sbi->s_mount_opt, ERRORS_RO);
 934                         break;
 935                 case Opt_err_cont:
 936                         clear_opt (sbi->s_mount_opt, ERRORS_RO);
 937                         clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
 938                         set_opt (sbi->s_mount_opt, ERRORS_CONT);
 939                         break;
 940                 case Opt_nouid32:
 941                         set_opt (sbi->s_mount_opt, NO_UID32);
 942                         break;
 943                 case Opt_nocheck:
 944                         clear_opt (sbi->s_mount_opt, CHECK);
 945                         break;
 946                 case Opt_debug:
 947                         set_opt (sbi->s_mount_opt, DEBUG);
 948                         break;
 949                 case Opt_oldalloc:
 950                         set_opt (sbi->s_mount_opt, OLDALLOC);
 951                         break;
 952                 case Opt_orlov:
 953                         clear_opt (sbi->s_mount_opt, OLDALLOC);
 954                         break;
 955 #ifdef CONFIG_EXT3_FS_XATTR
 956                 case Opt_user_xattr:
 957                         set_opt (sbi->s_mount_opt, XATTR_USER);
 958                         break;
 959                 case Opt_nouser_xattr:
 960                         clear_opt (sbi->s_mount_opt, XATTR_USER);
 961                         break;
 962 #else
 963                 case Opt_user_xattr:
 964                 case Opt_nouser_xattr:
 965                         printk("EXT3 (no)user_xattr options not supported\n");
 966                         break;
 967 #endif
 968 #ifdef CONFIG_EXT3_FS_POSIX_ACL
 969                 case Opt_acl:
 970                         set_opt(sbi->s_mount_opt, POSIX_ACL);
 971                         break;
 972                 case Opt_noacl:
 973                         clear_opt(sbi->s_mount_opt, POSIX_ACL);
 974                         break;
 975 #else
 976                 case Opt_acl:
 977                 case Opt_noacl:
 978                         printk("EXT3 (no)acl options not supported\n");
 979                         break;
 980 #endif
 981                 case Opt_reservation:
 982                         set_opt(sbi->s_mount_opt, RESERVATION);
 983                         break;
 984                 case Opt_noreservation:
 985                         clear_opt(sbi->s_mount_opt, RESERVATION);
 986                         break;
 987                 case Opt_journal_update:
 988                         /* @@@ FIXME */
 989                         /* Eventually we will want to be able to create
 990                            a journal file here.  For now, only allow the
 991                            user to specify an existing inode to be the
 992                            journal file. */
 993                         if (is_remount) {
 994                                 printk(KERN_ERR "EXT3-fs: cannot specify "
 995                                        "journal on remount\n");
 996                                 return 0;
 997                         }
 998                         set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
 999                         break;
1000                 case Opt_journal_inum:
1001                         if (is_remount) {
1002                                 printk(KERN_ERR "EXT3-fs: cannot specify "
1003                                        "journal on remount\n");
1004                                 return 0;
1005                         }
1006                         if (match_int(&args[0], &option))
1007                                 return 0;
1008                         *inum = option;
1009                         break;
1010                 case Opt_journal_dev:
1011                         if (is_remount) {
1012                                 printk(KERN_ERR "EXT3-fs: cannot specify "
1013                                        "journal on remount\n");
1014                                 return 0;
1015                         }
1016                         if (match_int(&args[0], &option))
1017                                 return 0;
1018                         *journal_devnum = option;
1019                         break;
1020                 case Opt_noload:
1021                         set_opt (sbi->s_mount_opt, NOLOAD);
1022                         break;
1023                 case Opt_commit:
1024                         if (match_int(&args[0], &option))
1025                                 return 0;
1026                         if (option < 0)
1027                                 return 0;
1028                         if (option == 0)
1029                                 option = JBD_DEFAULT_MAX_COMMIT_AGE;
1030                         sbi->s_commit_interval = HZ * option;
1031                         break;
1032                 case Opt_data_journal:
1033                         data_opt = EXT3_MOUNT_JOURNAL_DATA;
1034                         goto datacheck;
1035                 case Opt_data_ordered:
1036                         data_opt = EXT3_MOUNT_ORDERED_DATA;
1037                         goto datacheck;
1038                 case Opt_data_writeback:
1039                         data_opt = EXT3_MOUNT_WRITEBACK_DATA;
1040                 datacheck:
1041                         if (is_remount) {
1042                                 if ((sbi->s_mount_opt & EXT3_MOUNT_DATA_FLAGS)
1043                                                 != data_opt) {
1044                                         printk(KERN_ERR
1045                                                 "EXT3-fs: cannot change data "
1046                                                 "mode on remount\n");
1047                                         return 0;
1048                                 }
1049                         } else {
1050                                 sbi->s_mount_opt &= ~EXT3_MOUNT_DATA_FLAGS;
1051                                 sbi->s_mount_opt |= data_opt;
1052                         }
1053                         break;
1054                 case Opt_data_err_abort:
1055                         set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1056                         break;
1057                 case Opt_data_err_ignore:
1058                         clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1059                         break;
1060 #ifdef CONFIG_QUOTA
1061                 case Opt_usrjquota:
1062                         qtype = USRQUOTA;
1063                         goto set_qf_name;
1064                 case Opt_grpjquota:
1065                         qtype = GRPQUOTA;
1066 set_qf_name:
1067                         if (sb_any_quota_loaded(sb) &&
1068                             !sbi->s_qf_names[qtype]) {
1069                                 printk(KERN_ERR
1070                                         "EXT3-fs: Cannot change journaled "
1071                                         "quota options when quota turned on.\n");
1072                                 return 0;
1073                         }
1074                         qname = match_strdup(&args[0]);
1075                         if (!qname) {
1076                                 printk(KERN_ERR
1077                                         "EXT3-fs: not enough memory for "
1078                                         "storing quotafile name.\n");
1079                                 return 0;
1080                         }
1081                         if (sbi->s_qf_names[qtype] &&
1082                             strcmp(sbi->s_qf_names[qtype], qname)) {
1083                                 printk(KERN_ERR
1084                                         "EXT3-fs: %s quota file already "
1085                                         "specified.\n", QTYPE2NAME(qtype));
1086                                 kfree(qname);
1087                                 return 0;
1088                         }
1089                         sbi->s_qf_names[qtype] = qname;
1090                         if (strchr(sbi->s_qf_names[qtype], '/')) {
1091                                 printk(KERN_ERR
1092                                         "EXT3-fs: quotafile must be on "
1093                                         "filesystem root.\n");
1094                                 kfree(sbi->s_qf_names[qtype]);
1095                                 sbi->s_qf_names[qtype] = NULL;
1096                                 return 0;
1097                         }
1098                         set_opt(sbi->s_mount_opt, QUOTA);
1099                         break;
1100                 case Opt_offusrjquota:
1101                         qtype = USRQUOTA;
1102                         goto clear_qf_name;
1103                 case Opt_offgrpjquota:
1104                         qtype = GRPQUOTA;
1105 clear_qf_name:
1106                         if (sb_any_quota_loaded(sb) &&
1107                             sbi->s_qf_names[qtype]) {
1108                                 printk(KERN_ERR "EXT3-fs: Cannot change "
1109                                         "journaled quota options when "
1110                                         "quota turned on.\n");
1111                                 return 0;
1112                         }
1113                         /*
1114                          * The space will be released later when all options
1115                          * are confirmed to be correct
1116                          */
1117                         sbi->s_qf_names[qtype] = NULL;
1118                         break;
1119                 case Opt_jqfmt_vfsold:
1120                         qfmt = QFMT_VFS_OLD;
1121                         goto set_qf_format;
1122                 case Opt_jqfmt_vfsv0:
1123                         qfmt = QFMT_VFS_V0;
1124 set_qf_format:
1125                         if (sb_any_quota_loaded(sb) &&
1126                             sbi->s_jquota_fmt != qfmt) {
1127                                 printk(KERN_ERR "EXT3-fs: Cannot change "
1128                                         "journaled quota options when "
1129                                         "quota turned on.\n");
1130                                 return 0;
1131                         }
1132                         sbi->s_jquota_fmt = qfmt;
1133                         break;
1134                 case Opt_quota:
1135                 case Opt_usrquota:
1136                         set_opt(sbi->s_mount_opt, QUOTA);
1137                         set_opt(sbi->s_mount_opt, USRQUOTA);
1138                         break;
1139                 case Opt_grpquota:
1140                         set_opt(sbi->s_mount_opt, QUOTA);
1141                         set_opt(sbi->s_mount_opt, GRPQUOTA);
1142                         break;
1143                 case Opt_noquota:
1144                         if (sb_any_quota_loaded(sb)) {
1145                                 printk(KERN_ERR "EXT3-fs: Cannot change quota "
1146                                         "options when quota turned on.\n");
1147                                 return 0;
1148                         }
1149                         clear_opt(sbi->s_mount_opt, QUOTA);
1150                         clear_opt(sbi->s_mount_opt, USRQUOTA);
1151                         clear_opt(sbi->s_mount_opt, GRPQUOTA);
1152                         break;
1153 #else
1154                 case Opt_quota:
1155                 case Opt_usrquota:
1156                 case Opt_grpquota:
1157                         printk(KERN_ERR
1158                                 "EXT3-fs: quota options not supported.\n");
1159                         break;
1160                 case Opt_usrjquota:
1161                 case Opt_grpjquota:
1162                 case Opt_offusrjquota:
1163                 case Opt_offgrpjquota:
1164                 case Opt_jqfmt_vfsold:
1165                 case Opt_jqfmt_vfsv0:
1166                         printk(KERN_ERR
1167                                 "EXT3-fs: journaled quota options not "
1168                                 "supported.\n");
1169                         break;
1170                 case Opt_noquota:
1171                         break;
1172 #endif
1173                 case Opt_abort:
1174                         set_opt(sbi->s_mount_opt, ABORT);
1175                         break;
1176                 case Opt_barrier:
1177                         if (match_int(&args[0], &option))
1178                                 return 0;
1179                         if (option)
1180                                 set_opt(sbi->s_mount_opt, BARRIER);
1181                         else
1182                                 clear_opt(sbi->s_mount_opt, BARRIER);
1183                         break;
1184                 case Opt_ignore:
1185                         break;
1186                 case Opt_resize:
1187                         if (!is_remount) {
1188                                 printk("EXT3-fs: resize option only available "
1189                                         "for remount\n");
1190                                 return 0;
1191                         }
1192                         if (match_int(&args[0], &option) != 0)
1193                                 return 0;
1194                         *n_blocks_count = option;
1195                         break;
1196                 case Opt_nobh:
1197                         set_opt(sbi->s_mount_opt, NOBH);
1198                         break;
1199                 case Opt_bh:
1200                         clear_opt(sbi->s_mount_opt, NOBH);
1201                         break;
1202                 default:
1203                         printk (KERN_ERR
1204                                 "EXT3-fs: Unrecognized mount option \"%s\" "
1205                                 "or missing value\n", p);
1206                         return 0;
1207                 }
1208         }
1209 #ifdef CONFIG_QUOTA
1210         if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1211                 if ((sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA) &&
1212                      sbi->s_qf_names[USRQUOTA])
1213                         clear_opt(sbi->s_mount_opt, USRQUOTA);
1214
1215                 if ((sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA) &&
1216                      sbi->s_qf_names[GRPQUOTA])
1217                         clear_opt(sbi->s_mount_opt, GRPQUOTA);
1218
1219                 if ((sbi->s_qf_names[USRQUOTA] &&
1220                                 (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)) ||
1221                     (sbi->s_qf_names[GRPQUOTA] &&
1222                                 (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA))) {
1223                         printk(KERN_ERR "EXT3-fs: old and new quota "
1224                                         "format mixing.\n");
1225                         return 0;
1226                 }
1227
1228                 if (!sbi->s_jquota_fmt) {
1229                         printk(KERN_ERR "EXT3-fs: journaled quota format "
1230                                         "not specified.\n");
1231                         return 0;
1232                 }
1233         } else {
1234                 if (sbi->s_jquota_fmt) {
1235                         printk(KERN_ERR "EXT3-fs: journaled quota format "
1236                                         "specified with no journaling "
1237                                         "enabled.\n");
1238                         return 0;
1239                 }
1240         }
1241 #endif
1242         return 1;
1243 }
1244
1245 static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1246                             int read_only)
1247 {
1248         struct ext3_sb_info *sbi = EXT3_SB(sb);
1249         int res = 0;
1250
1251         if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
1252                 printk (KERN_ERR "EXT3-fs warning: revision level too high, "
1253                         "forcing read-only mode\n");
1254                 res = MS_RDONLY;
1255         }
1256         if (read_only)
1257                 return res;
1258         if (!(sbi->s_mount_state & EXT3_VALID_FS))
1259                 printk (KERN_WARNING "EXT3-fs warning: mounting unchecked fs, "
1260                         "running e2fsck is recommended\n");
1261         else if ((sbi->s_mount_state & EXT3_ERROR_FS))
1262                 printk (KERN_WARNING
1263                         "EXT3-fs warning: mounting fs with errors, "
1264                         "running e2fsck is recommended\n");
1265         else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1266                  le16_to_cpu(es->s_mnt_count) >=
1267                  (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1268                 printk (KERN_WARNING
1269                         "EXT3-fs warning: maximal mount count reached, "
1270                         "running e2fsck is recommended\n");
1271         else if (le32_to_cpu(es->s_checkinterval) &&
1272                 (le32_to_cpu(es->s_lastcheck) +
1273                         le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1274                 printk (KERN_WARNING
1275                         "EXT3-fs warning: checktime reached, "
1276                         "running e2fsck is recommended\n");
1277 #if 0
1278                 /* @@@ We _will_ want to clear the valid bit if we find
1279                    inconsistencies, to force a fsck at reboot.  But for
1280                    a plain journaled filesystem we can keep it set as
1281                    valid forever! :) */
1282         es->s_state &= cpu_to_le16(~EXT3_VALID_FS);
1283 #endif
1284         if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1285                 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
1286         le16_add_cpu(&es->s_mnt_count, 1);
1287         es->s_mtime = cpu_to_le32(get_seconds());
1288         ext3_update_dynamic_rev(sb);
1289         EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1290
1291         ext3_commit_super(sb, es, 1);
1292         if (test_opt(sb, DEBUG))
1293                 printk(KERN_INFO "[EXT3 FS bs=%lu, gc=%lu, "
1294                                 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1295                         sb->s_blocksize,
1296                         sbi->s_groups_count,
1297                         EXT3_BLOCKS_PER_GROUP(sb),
1298                         EXT3_INODES_PER_GROUP(sb),
1299                         sbi->s_mount_opt);
1300
1301         printk(KERN_INFO "EXT3 FS on %s, ", sb->s_id);
1302         if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1303                 char b[BDEVNAME_SIZE];
1304
1305                 printk("external journal on %s\n",
1306                         bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1307         } else {
1308                 printk("internal journal\n");
1309         }
1310         return res;
1311 }
1312
1313 /* Called at mount-time, super-block is locked */
1314 static int ext3_check_descriptors(struct super_block *sb)
1315 {
1316         struct ext3_sb_info *sbi = EXT3_SB(sb);
1317         int i;
1318
1319         ext3_debug ("Checking group descriptors");
1320
1321         for (i = 0; i < sbi->s_groups_count; i++) {
1322                 struct ext3_group_desc *gdp = ext3_get_group_desc(sb, i, NULL);
1323                 ext3_fsblk_t first_block = ext3_group_first_block_no(sb, i);
1324                 ext3_fsblk_t last_block;
1325
1326                 if (i == sbi->s_groups_count - 1)
1327                         last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
1328                 else
1329                         last_block = first_block +
1330                                 (EXT3_BLOCKS_PER_GROUP(sb) - 1);
1331
1332                 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
1333                     le32_to_cpu(gdp->bg_block_bitmap) > last_block)
1334                 {
1335                         ext3_error (sb, "ext3_check_descriptors",
1336                                     "Block bitmap for group %d"
1337                                     " not in group (block %lu)!",
1338                                     i, (unsigned long)
1339                                         le32_to_cpu(gdp->bg_block_bitmap));
1340                         return 0;
1341                 }
1342                 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
1343                     le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
1344                 {
1345                         ext3_error (sb, "ext3_check_descriptors",
1346                                     "Inode bitmap for group %d"
1347                                     " not in group (block %lu)!",
1348                                     i, (unsigned long)
1349                                         le32_to_cpu(gdp->bg_inode_bitmap));
1350                         return 0;
1351                 }
1352                 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
1353                     le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
1354                     last_block)
1355                 {
1356                         ext3_error (sb, "ext3_check_descriptors",
1357                                     "Inode table for group %d"
1358                                     " not in group (block %lu)!",
1359                                     i, (unsigned long)
1360                                         le32_to_cpu(gdp->bg_inode_table));
1361                         return 0;
1362                 }
1363         }
1364
1365         sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1366         sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1367         return 1;
1368 }
1369
1370
1371 /* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1372  * the superblock) which were deleted from all directories, but held open by
1373  * a process at the time of a crash.  We walk the list and try to delete these
1374  * inodes at recovery time (only with a read-write filesystem).
1375  *
1376  * In order to keep the orphan inode chain consistent during traversal (in
1377  * case of crash during recovery), we link each inode into the superblock
1378  * orphan list_head and handle it the same way as an inode deletion during
1379  * normal operation (which journals the operations for us).
1380  *
1381  * We only do an iget() and an iput() on each inode, which is very safe if we
1382  * accidentally point at an in-use or already deleted inode.  The worst that
1383  * can happen in this case is that we get a "bit already cleared" message from
1384  * ext3_free_inode().  The only reason we would point at a wrong inode is if
1385  * e2fsck was run on this filesystem, and it must have already done the orphan
1386  * inode cleanup for us, so we can safely abort without any further action.
1387  */
1388 static void ext3_orphan_cleanup (struct super_block * sb,
1389                                  struct ext3_super_block * es)
1390 {
1391         unsigned int s_flags = sb->s_flags;
1392         int nr_orphans = 0, nr_truncates = 0;
1393 #ifdef CONFIG_QUOTA
1394         int i;
1395 #endif
1396         if (!es->s_last_orphan) {
1397                 jbd_debug(4, "no orphan inodes to clean up\n");
1398                 return;
1399         }
1400
1401         if (bdev_read_only(sb->s_bdev)) {
1402                 printk(KERN_ERR "EXT3-fs: write access "
1403                         "unavailable, skipping orphan cleanup.\n");
1404                 return;
1405         }
1406
1407         if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1408                 if (es->s_last_orphan)
1409                         jbd_debug(1, "Errors on filesystem, "
1410                                   "clearing orphan list.\n");
1411                 es->s_last_orphan = 0;
1412                 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1413                 return;
1414         }
1415
1416         if (s_flags & MS_RDONLY) {
1417                 printk(KERN_INFO "EXT3-fs: %s: orphan cleanup on readonly fs\n",
1418                        sb->s_id);
1419                 sb->s_flags &= ~MS_RDONLY;
1420         }
1421 #ifdef CONFIG_QUOTA
1422         /* Needed for iput() to work correctly and not trash data */
1423         sb->s_flags |= MS_ACTIVE;
1424         /* Turn on quotas so that they are updated correctly */
1425         for (i = 0; i < MAXQUOTAS; i++) {
1426                 if (EXT3_SB(sb)->s_qf_names[i]) {
1427                         int ret = ext3_quota_on_mount(sb, i);
1428                         if (ret < 0)
1429                                 printk(KERN_ERR
1430                                         "EXT3-fs: Cannot turn on journaled "
1431                                         "quota: error %d\n", ret);
1432                 }
1433         }
1434 #endif
1435
1436         while (es->s_last_orphan) {
1437                 struct inode *inode;
1438
1439                 inode = ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1440                 if (IS_ERR(inode)) {
1441                         es->s_last_orphan = 0;
1442                         break;
1443                 }
1444
1445                 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1446                 vfs_dq_init(inode);
1447                 if (inode->i_nlink) {
1448                         printk(KERN_DEBUG
1449                                 "%s: truncating inode %lu to %Ld bytes\n",
1450                                 __func__, inode->i_ino, inode->i_size);
1451                         jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1452                                   inode->i_ino, inode->i_size);
1453                         ext3_truncate(inode);
1454                         nr_truncates++;
1455                 } else {
1456                         printk(KERN_DEBUG
1457                                 "%s: deleting unreferenced inode %lu\n",
1458                                 __func__, inode->i_ino);
1459                         jbd_debug(2, "deleting unreferenced inode %lu\n",
1460                                   inode->i_ino);
1461                         nr_orphans++;
1462                 }
1463                 iput(inode);  /* The delete magic happens here! */
1464         }
1465
1466 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1467
1468         if (nr_orphans)
1469                 printk(KERN_INFO "EXT3-fs: %s: %d orphan inode%s deleted\n",
1470                        sb->s_id, PLURAL(nr_orphans));
1471         if (nr_truncates)
1472                 printk(KERN_INFO "EXT3-fs: %s: %d truncate%s cleaned up\n",
1473                        sb->s_id, PLURAL(nr_truncates));
1474 #ifdef CONFIG_QUOTA
1475         /* Turn quotas off */
1476         for (i = 0; i < MAXQUOTAS; i++) {
1477                 if (sb_dqopt(sb)->files[i])
1478                         vfs_quota_off(sb, i, 0);
1479         }
1480 #endif
1481         sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1482 }
1483
1484 /*
1485  * Maximal file size.  There is a direct, and {,double-,triple-}indirect
1486  * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1487  * We need to be 1 filesystem block less than the 2^32 sector limit.
1488  */
1489 static loff_t ext3_max_size(int bits)
1490 {
1491         loff_t res = EXT3_NDIR_BLOCKS;
1492         int meta_blocks;
1493         loff_t upper_limit;
1494
1495         /* This is calculated to be the largest file size for a
1496          * dense, file such that the total number of
1497          * sectors in the file, including data and all indirect blocks,
1498          * does not exceed 2^32 -1
1499          * __u32 i_blocks representing the total number of
1500          * 512 bytes blocks of the file
1501          */
1502         upper_limit = (1LL << 32) - 1;
1503
1504         /* total blocks in file system block size */
1505         upper_limit >>= (bits - 9);
1506
1507
1508         /* indirect blocks */
1509         meta_blocks = 1;
1510         /* double indirect blocks */
1511         meta_blocks += 1 + (1LL << (bits-2));
1512         /* tripple indirect blocks */
1513         meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1514
1515         upper_limit -= meta_blocks;
1516         upper_limit <<= bits;
1517
1518         res += 1LL << (bits-2);
1519         res += 1LL << (2*(bits-2));
1520         res += 1LL << (3*(bits-2));
1521         res <<= bits;
1522         if (res > upper_limit)
1523                 res = upper_limit;
1524
1525         if (res > MAX_LFS_FILESIZE)
1526                 res = MAX_LFS_FILESIZE;
1527
1528         return res;
1529 }
1530
1531 static ext3_fsblk_t descriptor_loc(struct super_block *sb,
1532                                     ext3_fsblk_t logic_sb_block,
1533                                     int nr)
1534 {
1535         struct ext3_sb_info *sbi = EXT3_SB(sb);
1536         unsigned long bg, first_meta_bg;
1537         int has_super = 0;
1538
1539         first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1540
1541         if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1542             nr < first_meta_bg)
1543                 return (logic_sb_block + nr + 1);
1544         bg = sbi->s_desc_per_block * nr;
1545         if (ext3_bg_has_super(sb, bg))
1546                 has_super = 1;
1547         return (has_super + ext3_group_first_block_no(sb, bg));
1548 }
1549
1550
1551 static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1552 {
1553         struct buffer_head * bh;
1554         struct ext3_super_block *es = NULL;
1555         struct ext3_sb_info *sbi;
1556         ext3_fsblk_t block;
1557         ext3_fsblk_t sb_block = get_sb_block(&data);
1558         ext3_fsblk_t logic_sb_block;
1559         unsigned long offset = 0;
1560         unsigned int journal_inum = 0;
1561         unsigned long journal_devnum = 0;
1562         unsigned long def_mount_opts;
1563         struct inode *root;
1564         int blocksize;
1565         int hblock;
1566         int db_count;
1567         int i;
1568         int needs_recovery;
1569         int ret = -EINVAL;
1570         __le32 features;
1571         int err;
1572
1573         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1574         if (!sbi)
1575                 return -ENOMEM;
1576
1577         sbi->s_blockgroup_lock =
1578                 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
1579         if (!sbi->s_blockgroup_lock) {
1580                 kfree(sbi);
1581                 return -ENOMEM;
1582         }
1583         sb->s_fs_info = sbi;
1584         sbi->s_mount_opt = 0;
1585         sbi->s_resuid = EXT3_DEF_RESUID;
1586         sbi->s_resgid = EXT3_DEF_RESGID;
1587         sbi->s_sb_block = sb_block;
1588
1589         unlock_kernel();
1590
1591         blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1592         if (!blocksize) {
1593                 printk(KERN_ERR "EXT3-fs: unable to set blocksize\n");
1594                 goto out_fail;
1595         }
1596
1597         /*
1598          * The ext3 superblock will not be buffer aligned for other than 1kB
1599          * block sizes.  We need to calculate the offset from buffer start.
1600          */
1601         if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1602                 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1603                 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1604         } else {
1605                 logic_sb_block = sb_block;
1606         }
1607
1608         if (!(bh = sb_bread(sb, logic_sb_block))) {
1609                 printk (KERN_ERR "EXT3-fs: unable to read superblock\n");
1610                 goto out_fail;
1611         }
1612         /*
1613          * Note: s_es must be initialized as soon as possible because
1614          *       some ext3 macro-instructions depend on its value
1615          */
1616         es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1617         sbi->s_es = es;
1618         sb->s_magic = le16_to_cpu(es->s_magic);
1619         if (sb->s_magic != EXT3_SUPER_MAGIC)
1620                 goto cantfind_ext3;
1621
1622         /* Set defaults before we parse the mount options */
1623         def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1624         if (def_mount_opts & EXT3_DEFM_DEBUG)
1625                 set_opt(sbi->s_mount_opt, DEBUG);
1626         if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1627                 set_opt(sbi->s_mount_opt, GRPID);
1628         if (def_mount_opts & EXT3_DEFM_UID16)
1629                 set_opt(sbi->s_mount_opt, NO_UID32);
1630 #ifdef CONFIG_EXT3_FS_XATTR
1631         if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1632                 set_opt(sbi->s_mount_opt, XATTR_USER);
1633 #endif
1634 #ifdef CONFIG_EXT3_FS_POSIX_ACL
1635         if (def_mount_opts & EXT3_DEFM_ACL)
1636                 set_opt(sbi->s_mount_opt, POSIX_ACL);
1637 #endif
1638         if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1639                 sbi->s_mount_opt |= EXT3_MOUNT_JOURNAL_DATA;
1640         else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1641                 sbi->s_mount_opt |= EXT3_MOUNT_ORDERED_DATA;
1642         else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1643                 sbi->s_mount_opt |= EXT3_MOUNT_WRITEBACK_DATA;
1644
1645         if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1646                 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1647         else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_CONTINUE)
1648                 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1649         else
1650                 set_opt(sbi->s_mount_opt, ERRORS_RO);
1651
1652         sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1653         sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1654
1655         set_opt(sbi->s_mount_opt, RESERVATION);
1656
1657         if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1658                             NULL, 0))
1659                 goto failed_mount;
1660
1661         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1662                 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1663
1664         if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1665             (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1666              EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1667              EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1668                 printk(KERN_WARNING
1669                        "EXT3-fs warning: feature flags set on rev 0 fs, "
1670                        "running e2fsck is recommended\n");
1671         /*
1672          * Check feature flags regardless of the revision level, since we
1673          * previously didn't change the revision level when setting the flags,
1674          * so there is a chance incompat flags are set on a rev 0 filesystem.
1675          */
1676         features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1677         if (features) {
1678                 printk(KERN_ERR "EXT3-fs: %s: couldn't mount because of "
1679                        "unsupported optional features (%x).\n",
1680                        sb->s_id, le32_to_cpu(features));
1681                 goto failed_mount;
1682         }
1683         features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1684         if (!(sb->s_flags & MS_RDONLY) && features) {
1685                 printk(KERN_ERR "EXT3-fs: %s: couldn't mount RDWR because of "
1686                        "unsupported optional features (%x).\n",
1687                        sb->s_id, le32_to_cpu(features));
1688                 goto failed_mount;
1689         }
1690         blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1691
1692         if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1693             blocksize > EXT3_MAX_BLOCK_SIZE) {
1694                 printk(KERN_ERR
1695                        "EXT3-fs: Unsupported filesystem blocksize %d on %s.\n",
1696                        blocksize, sb->s_id);
1697                 goto failed_mount;
1698         }
1699
1700         hblock = bdev_logical_block_size(sb->s_bdev);
1701         if (sb->s_blocksize != blocksize) {
1702                 /*
1703                  * Make sure the blocksize for the filesystem is larger
1704                  * than the hardware sectorsize for the machine.
1705                  */
1706                 if (blocksize < hblock) {
1707                         printk(KERN_ERR "EXT3-fs: blocksize %d too small for "
1708                                "device blocksize %d.\n", blocksize, hblock);
1709                         goto failed_mount;
1710                 }
1711
1712                 brelse (bh);
1713                 if (!sb_set_blocksize(sb, blocksize)) {
1714                         printk(KERN_ERR "EXT3-fs: bad blocksize %d.\n",
1715                                 blocksize);
1716                         goto out_fail;
1717                 }
1718                 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1719                 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1720                 bh = sb_bread(sb, logic_sb_block);
1721                 if (!bh) {
1722                         printk(KERN_ERR
1723                                "EXT3-fs: Can't read superblock on 2nd try.\n");
1724                         goto failed_mount;
1725                 }
1726                 es = (struct ext3_super_block *)(((char *)bh->b_data) + offset);
1727                 sbi->s_es = es;
1728                 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
1729                         printk (KERN_ERR
1730                                 "EXT3-fs: Magic mismatch, very weird !\n");
1731                         goto failed_mount;
1732                 }
1733         }
1734
1735         sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1736
1737         if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1738                 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1739                 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1740         } else {
1741                 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1742                 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1743                 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
1744                     (!is_power_of_2(sbi->s_inode_size)) ||
1745                     (sbi->s_inode_size > blocksize)) {
1746                         printk (KERN_ERR
1747                                 "EXT3-fs: unsupported inode size: %d\n",
1748                                 sbi->s_inode_size);
1749                         goto failed_mount;
1750                 }
1751         }
1752         sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1753                                    le32_to_cpu(es->s_log_frag_size);
1754         if (blocksize != sbi->s_frag_size) {
1755                 printk(KERN_ERR
1756                        "EXT3-fs: fragsize %lu != blocksize %u (unsupported)\n",
1757                        sbi->s_frag_size, blocksize);
1758                 goto failed_mount;
1759         }
1760         sbi->s_frags_per_block = 1;
1761         sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1762         sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1763         sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1764         if (EXT3_INODE_SIZE(sb) == 0 || EXT3_INODES_PER_GROUP(sb) == 0)
1765                 goto cantfind_ext3;
1766         sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1767         if (sbi->s_inodes_per_block == 0)
1768                 goto cantfind_ext3;
1769         sbi->s_itb_per_group = sbi->s_inodes_per_group /
1770                                         sbi->s_inodes_per_block;
1771         sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1772         sbi->s_sbh = bh;
1773         sbi->s_mount_state = le16_to_cpu(es->s_state);
1774         sbi->s_addr_per_block_bits = ilog2(EXT3_ADDR_PER_BLOCK(sb));
1775         sbi->s_desc_per_block_bits = ilog2(EXT3_DESC_PER_BLOCK(sb));
1776         for (i=0; i < 4; i++)
1777                 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1778         sbi->s_def_hash_version = es->s_def_hash_version;
1779         i = le32_to_cpu(es->s_flags);
1780         if (i & EXT2_FLAGS_UNSIGNED_HASH)
1781                 sbi->s_hash_unsigned = 3;
1782         else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
1783 #ifdef __CHAR_UNSIGNED__
1784                 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
1785                 sbi->s_hash_unsigned = 3;
1786 #else
1787                 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
1788 #endif
1789         }
1790
1791         if (sbi->s_blocks_per_group > blocksize * 8) {
1792                 printk (KERN_ERR
1793                         "EXT3-fs: #blocks per group too big: %lu\n",
1794                         sbi->s_blocks_per_group);
1795                 goto failed_mount;
1796         }
1797         if (sbi->s_frags_per_group > blocksize * 8) {
1798                 printk (KERN_ERR
1799                         "EXT3-fs: #fragments per group too big: %lu\n",
1800                         sbi->s_frags_per_group);
1801                 goto failed_mount;
1802         }
1803         if (sbi->s_inodes_per_group > blocksize * 8) {
1804                 printk (KERN_ERR
1805                         "EXT3-fs: #inodes per group too big: %lu\n",
1806                         sbi->s_inodes_per_group);
1807                 goto failed_mount;
1808         }
1809
1810         if (le32_to_cpu(es->s_blocks_count) >
1811                     (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
1812                 printk(KERN_ERR "EXT3-fs: filesystem on %s:"
1813                         " too large to mount safely\n", sb->s_id);
1814                 if (sizeof(sector_t) < 8)
1815                         printk(KERN_WARNING "EXT3-fs: CONFIG_LBD not "
1816                                         "enabled\n");
1817                 goto failed_mount;
1818         }
1819
1820         if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1821                 goto cantfind_ext3;
1822         sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1823                                le32_to_cpu(es->s_first_data_block) - 1)
1824                                        / EXT3_BLOCKS_PER_GROUP(sb)) + 1;
1825         db_count = (sbi->s_groups_count + EXT3_DESC_PER_BLOCK(sb) - 1) /
1826                    EXT3_DESC_PER_BLOCK(sb);
1827         sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1828                                     GFP_KERNEL);
1829         if (sbi->s_group_desc == NULL) {
1830                 printk (KERN_ERR "EXT3-fs: not enough memory\n");
1831                 goto failed_mount;
1832         }
1833
1834         bgl_lock_init(sbi->s_blockgroup_lock);
1835
1836         for (i = 0; i < db_count; i++) {
1837                 block = descriptor_loc(sb, logic_sb_block, i);
1838                 sbi->s_group_desc[i] = sb_bread(sb, block);
1839                 if (!sbi->s_group_desc[i]) {
1840                         printk (KERN_ERR "EXT3-fs: "
1841                                 "can't read group descriptor %d\n", i);
1842                         db_count = i;
1843                         goto failed_mount2;
1844                 }
1845         }
1846         if (!ext3_check_descriptors (sb)) {
1847                 printk(KERN_ERR "EXT3-fs: group descriptors corrupted!\n");
1848                 goto failed_mount2;
1849         }
1850         sbi->s_gdb_count = db_count;
1851         get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1852         spin_lock_init(&sbi->s_next_gen_lock);
1853
1854         err = percpu_counter_init(&sbi->s_freeblocks_counter,
1855                         ext3_count_free_blocks(sb));
1856         if (!err) {
1857                 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1858                                 ext3_count_free_inodes(sb));
1859         }
1860         if (!err) {
1861                 err = percpu_counter_init(&sbi->s_dirs_counter,
1862                                 ext3_count_dirs(sb));
1863         }
1864         if (err) {
1865                 printk(KERN_ERR "EXT3-fs: insufficient memory\n");
1866                 goto failed_mount3;
1867         }
1868
1869         /* per fileystem reservation list head & lock */
1870         spin_lock_init(&sbi->s_rsv_window_lock);
1871         sbi->s_rsv_window_root = RB_ROOT;
1872         /* Add a single, static dummy reservation to the start of the
1873          * reservation window list --- it gives us a placeholder for
1874          * append-at-start-of-list which makes the allocation logic
1875          * _much_ simpler. */
1876         sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1877         sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1878         sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1879         sbi->s_rsv_window_head.rsv_goal_size = 0;
1880         ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1881
1882         /*
1883          * set up enough so that it can read an inode
1884          */
1885         sb->s_op = &ext3_sops;
1886         sb->s_export_op = &ext3_export_ops;
1887         sb->s_xattr = ext3_xattr_handlers;
1888 #ifdef CONFIG_QUOTA
1889         sb->s_qcop = &ext3_qctl_operations;
1890         sb->dq_op = &ext3_quota_operations;
1891 #endif
1892         INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1893
1894         sb->s_root = NULL;
1895
1896         needs_recovery = (es->s_last_orphan != 0 ||
1897                           EXT3_HAS_INCOMPAT_FEATURE(sb,
1898                                     EXT3_FEATURE_INCOMPAT_RECOVER));
1899
1900         /*
1901          * The first inode we look at is the journal inode.  Don't try
1902          * root first: it may be modified in the journal!
1903          */
1904         if (!test_opt(sb, NOLOAD) &&
1905             EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
1906                 if (ext3_load_journal(sb, es, journal_devnum))
1907                         goto failed_mount3;
1908         } else if (journal_inum) {
1909                 if (ext3_create_journal(sb, es, journal_inum))
1910                         goto failed_mount3;
1911         } else {
1912                 if (!silent)
1913                         printk (KERN_ERR
1914                                 "ext3: No journal on filesystem on %s\n",
1915                                 sb->s_id);
1916                 goto failed_mount3;
1917         }
1918
1919         /* We have now updated the journal if required, so we can
1920          * validate the data journaling mode. */
1921         switch (test_opt(sb, DATA_FLAGS)) {
1922         case 0:
1923                 /* No mode set, assume a default based on the journal
1924                    capabilities: ORDERED_DATA if the journal can
1925                    cope, else JOURNAL_DATA */
1926                 if (journal_check_available_features
1927                     (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
1928                         set_opt(sbi->s_mount_opt, DEFAULT_DATA_MODE);
1929                 else
1930                         set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1931                 break;
1932
1933         case EXT3_MOUNT_ORDERED_DATA:
1934         case EXT3_MOUNT_WRITEBACK_DATA:
1935                 if (!journal_check_available_features
1936                     (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
1937                         printk(KERN_ERR "EXT3-fs: Journal does not support "
1938                                "requested data journaling mode\n");
1939                         goto failed_mount4;
1940                 }
1941         default:
1942                 break;
1943         }
1944
1945         if (test_opt(sb, NOBH)) {
1946                 if (!(test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)) {
1947                         printk(KERN_WARNING "EXT3-fs: Ignoring nobh option - "
1948                                 "its supported only with writeback mode\n");
1949                         clear_opt(sbi->s_mount_opt, NOBH);
1950                 }
1951         }
1952         /*
1953          * The journal_load will have done any necessary log recovery,
1954          * so we can safely mount the rest of the filesystem now.
1955          */
1956
1957         root = ext3_iget(sb, EXT3_ROOT_INO);
1958         if (IS_ERR(root)) {
1959                 printk(KERN_ERR "EXT3-fs: get root inode failed\n");
1960                 ret = PTR_ERR(root);
1961                 goto failed_mount4;
1962         }
1963         if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1964                 iput(root);
1965                 printk(KERN_ERR "EXT3-fs: corrupt root inode, run e2fsck\n");
1966                 goto failed_mount4;
1967         }
1968         sb->s_root = d_alloc_root(root);
1969         if (!sb->s_root) {
1970                 printk(KERN_ERR "EXT3-fs: get root dentry failed\n");
1971                 iput(root);
1972                 ret = -ENOMEM;
1973                 goto failed_mount4;
1974         }
1975
1976         ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
1977         /*
1978          * akpm: core read_super() calls in here with the superblock locked.
1979          * That deadlocks, because orphan cleanup needs to lock the superblock
1980          * in numerous places.  Here we just pop the lock - it's relatively
1981          * harmless, because we are now ready to accept write_super() requests,
1982          * and aviro says that's the only reason for hanging onto the
1983          * superblock lock.
1984          */
1985         EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
1986         ext3_orphan_cleanup(sb, es);
1987         EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
1988         if (needs_recovery)
1989                 printk (KERN_INFO "EXT3-fs: recovery complete.\n");
1990         ext3_mark_recovery_complete(sb, es);
1991         printk (KERN_INFO "EXT3-fs: mounted filesystem with %s data mode.\n",
1992                 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
1993                 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
1994                 "writeback");
1995
1996         lock_kernel();
1997         return 0;
1998
1999 cantfind_ext3:
2000         if (!silent)
2001                 printk(KERN_ERR "VFS: Can't find ext3 filesystem on dev %s.\n",
2002                        sb->s_id);
2003         goto failed_mount;
2004
2005 failed_mount4:
2006         journal_destroy(sbi->s_journal);
2007 failed_mount3:
2008         percpu_counter_destroy(&sbi->s_freeblocks_counter);
2009         percpu_counter_destroy(&sbi->s_freeinodes_counter);
2010         percpu_counter_destroy(&sbi->s_dirs_counter);
2011 failed_mount2:
2012         for (i = 0; i < db_count; i++)
2013                 brelse(sbi->s_group_desc[i]);
2014         kfree(sbi->s_group_desc);
2015 failed_mount:
2016 #ifdef CONFIG_QUOTA
2017         for (i = 0; i < MAXQUOTAS; i++)
2018                 kfree(sbi->s_qf_names[i]);
2019 #endif
2020         ext3_blkdev_remove(sbi);
2021         brelse(bh);
2022 out_fail:
2023         sb->s_fs_info = NULL;
2024         kfree(sbi->s_blockgroup_lock);
2025         kfree(sbi);
2026         lock_kernel();
2027         return ret;
2028 }
2029
2030 /*
2031  * Setup any per-fs journal parameters now.  We'll do this both on
2032  * initial mount, once the journal has been initialised but before we've
2033  * done any recovery; and again on any subsequent remount.
2034  */
2035 static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
2036 {
2037         struct ext3_sb_info *sbi = EXT3_SB(sb);
2038
2039         if (sbi->s_commit_interval)
2040                 journal->j_commit_interval = sbi->s_commit_interval;
2041         /* We could also set up an ext3-specific default for the commit
2042          * interval here, but for now we'll just fall back to the jbd
2043          * default. */
2044
2045         spin_lock(&journal->j_state_lock);
2046         if (test_opt(sb, BARRIER))
2047                 journal->j_flags |= JFS_BARRIER;
2048         else
2049                 journal->j_flags &= ~JFS_BARRIER;
2050         if (test_opt(sb, DATA_ERR_ABORT))
2051                 journal->j_flags |= JFS_ABORT_ON_SYNCDATA_ERR;
2052         else
2053                 journal->j_flags &= ~JFS_ABORT_ON_SYNCDATA_ERR;
2054         spin_unlock(&journal->j_state_lock);
2055 }
2056
2057 static journal_t *ext3_get_journal(struct super_block *sb,
2058                                    unsigned int journal_inum)
2059 {
2060         struct inode *journal_inode;
2061         journal_t *journal;
2062
2063         /* First, test for the existence of a valid inode on disk.  Bad
2064          * things happen if we iget() an unused inode, as the subsequent
2065          * iput() will try to delete it. */
2066
2067         journal_inode = ext3_iget(sb, journal_inum);
2068         if (IS_ERR(journal_inode)) {
2069                 printk(KERN_ERR "EXT3-fs: no journal found.\n");
2070                 return NULL;
2071         }
2072         if (!journal_inode->i_nlink) {
2073                 make_bad_inode(journal_inode);
2074                 iput(journal_inode);
2075                 printk(KERN_ERR "EXT3-fs: journal inode is deleted.\n");
2076                 return NULL;
2077         }
2078
2079         jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2080                   journal_inode, journal_inode->i_size);
2081         if (!S_ISREG(journal_inode->i_mode)) {
2082                 printk(KERN_ERR "EXT3-fs: invalid journal inode.\n");
2083                 iput(journal_inode);
2084                 return NULL;
2085         }
2086
2087         journal = journal_init_inode(journal_inode);
2088         if (!journal) {
2089                 printk(KERN_ERR "EXT3-fs: Could not load journal inode\n");
2090                 iput(journal_inode);
2091                 return NULL;
2092         }
2093         journal->j_private = sb;
2094         ext3_init_journal_params(sb, journal);
2095         return journal;
2096 }
2097
2098 static journal_t *ext3_get_dev_journal(struct super_block *sb,
2099                                        dev_t j_dev)
2100 {
2101         struct buffer_head * bh;
2102         journal_t *journal;
2103         ext3_fsblk_t start;
2104         ext3_fsblk_t len;
2105         int hblock, blocksize;
2106         ext3_fsblk_t sb_block;
2107         unsigned long offset;
2108         struct ext3_super_block * es;
2109         struct block_device *bdev;
2110
2111         bdev = ext3_blkdev_get(j_dev);
2112         if (bdev == NULL)
2113                 return NULL;
2114
2115         if (bd_claim(bdev, sb)) {
2116                 printk(KERN_ERR
2117                         "EXT3: failed to claim external journal device.\n");
2118                 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
2119                 return NULL;
2120         }
2121
2122         blocksize = sb->s_blocksize;
2123         hblock = bdev_logical_block_size(bdev);
2124         if (blocksize < hblock) {
2125                 printk(KERN_ERR
2126                         "EXT3-fs: blocksize too small for journal device.\n");
2127                 goto out_bdev;
2128         }
2129
2130         sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
2131         offset = EXT3_MIN_BLOCK_SIZE % blocksize;
2132         set_blocksize(bdev, blocksize);
2133         if (!(bh = __bread(bdev, sb_block, blocksize))) {
2134                 printk(KERN_ERR "EXT3-fs: couldn't read superblock of "
2135                        "external journal\n");
2136                 goto out_bdev;
2137         }
2138
2139         es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
2140         if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
2141             !(le32_to_cpu(es->s_feature_incompat) &
2142               EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2143                 printk(KERN_ERR "EXT3-fs: external journal has "
2144                                         "bad superblock\n");
2145                 brelse(bh);
2146                 goto out_bdev;
2147         }
2148
2149         if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2150                 printk(KERN_ERR "EXT3-fs: journal UUID does not match\n");
2151                 brelse(bh);
2152                 goto out_bdev;
2153         }
2154
2155         len = le32_to_cpu(es->s_blocks_count);
2156         start = sb_block + 1;
2157         brelse(bh);     /* we're done with the superblock */
2158
2159         journal = journal_init_dev(bdev, sb->s_bdev,
2160                                         start, len, blocksize);
2161         if (!journal) {
2162                 printk(KERN_ERR "EXT3-fs: failed to create device journal\n");
2163                 goto out_bdev;
2164         }
2165         journal->j_private = sb;
2166         ll_rw_block(READ, 1, &journal->j_sb_buffer);
2167         wait_on_buffer(journal->j_sb_buffer);
2168         if (!buffer_uptodate(journal->j_sb_buffer)) {
2169                 printk(KERN_ERR "EXT3-fs: I/O error on journal device\n");
2170                 goto out_journal;
2171         }
2172         if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
2173                 printk(KERN_ERR "EXT3-fs: External journal has more than one "
2174                                         "user (unsupported) - %d\n",
2175                         be32_to_cpu(journal->j_superblock->s_nr_users));
2176                 goto out_journal;
2177         }
2178         EXT3_SB(sb)->journal_bdev = bdev;
2179         ext3_init_journal_params(sb, journal);
2180         return journal;
2181 out_journal:
2182         journal_destroy(journal);
2183 out_bdev:
2184         ext3_blkdev_put(bdev);
2185         return NULL;
2186 }
2187
2188 static int ext3_load_journal(struct super_block *sb,
2189                              struct ext3_super_block *es,
2190                              unsigned long journal_devnum)
2191 {
2192         journal_t *journal;
2193         unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2194         dev_t journal_dev;
2195         int err = 0;
2196         int really_read_only;
2197
2198         if (journal_devnum &&
2199             journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2200                 printk(KERN_INFO "EXT3-fs: external journal device major/minor "
2201                         "numbers have changed\n");
2202                 journal_dev = new_decode_dev(journal_devnum);
2203         } else
2204                 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2205
2206         really_read_only = bdev_read_only(sb->s_bdev);
2207
2208         /*
2209          * Are we loading a blank journal or performing recovery after a
2210          * crash?  For recovery, we need to check in advance whether we
2211          * can get read-write access to the device.
2212          */
2213
2214         if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
2215                 if (sb->s_flags & MS_RDONLY) {
2216                         printk(KERN_INFO "EXT3-fs: INFO: recovery "
2217                                         "required on readonly filesystem.\n");
2218                         if (really_read_only) {
2219                                 printk(KERN_ERR "EXT3-fs: write access "
2220                                         "unavailable, cannot proceed.\n");
2221                                 return -EROFS;
2222                         }
2223                         printk (KERN_INFO "EXT3-fs: write access will "
2224                                         "be enabled during recovery.\n");
2225                 }
2226         }
2227
2228         if (journal_inum && journal_dev) {
2229                 printk(KERN_ERR "EXT3-fs: filesystem has both journal "
2230                        "and inode journals!\n");
2231                 return -EINVAL;
2232         }
2233
2234         if (journal_inum) {
2235                 if (!(journal = ext3_get_journal(sb, journal_inum)))
2236                         return -EINVAL;
2237         } else {
2238                 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
2239                         return -EINVAL;
2240         }
2241
2242         if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2243                 err = journal_update_format(journal);
2244                 if (err)  {
2245                         printk(KERN_ERR "EXT3-fs: error updating journal.\n");
2246                         journal_destroy(journal);
2247                         return err;
2248                 }
2249         }
2250
2251         if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
2252                 err = journal_wipe(journal, !really_read_only);
2253         if (!err)
2254                 err = journal_load(journal);
2255
2256         if (err) {
2257                 printk(KERN_ERR "EXT3-fs: error loading journal.\n");
2258                 journal_destroy(journal);
2259                 return err;
2260         }
2261
2262         EXT3_SB(sb)->s_journal = journal;
2263         ext3_clear_journal_err(sb, es);
2264
2265         if (journal_devnum &&
2266             journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2267                 es->s_journal_dev = cpu_to_le32(journal_devnum);
2268
2269                 /* Make sure we flush the recovery flag to disk. */
2270                 ext3_commit_super(sb, es, 1);
2271         }
2272
2273         return 0;
2274 }
2275
2276 static int ext3_create_journal(struct super_block * sb,
2277                                struct ext3_super_block * es,
2278                                unsigned int journal_inum)
2279 {
2280         journal_t *journal;
2281         int err;
2282
2283         if (sb->s_flags & MS_RDONLY) {
2284                 printk(KERN_ERR "EXT3-fs: readonly filesystem when trying to "
2285                                 "create journal.\n");
2286                 return -EROFS;
2287         }
2288
2289         journal = ext3_get_journal(sb, journal_inum);
2290         if (!journal)
2291                 return -EINVAL;
2292
2293         printk(KERN_INFO "EXT3-fs: creating new journal on inode %u\n",
2294                journal_inum);
2295
2296         err = journal_create(journal);
2297         if (err) {
2298                 printk(KERN_ERR "EXT3-fs: error creating journal.\n");
2299                 journal_destroy(journal);
2300                 return -EIO;
2301         }
2302
2303         EXT3_SB(sb)->s_journal = journal;
2304
2305         ext3_update_dynamic_rev(sb);
2306         EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2307         EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2308
2309         es->s_journal_inum = cpu_to_le32(journal_inum);
2310
2311         /* Make sure we flush the recovery flag to disk. */
2312         ext3_commit_super(sb, es, 1);
2313
2314         return 0;
2315 }
2316
2317 static int ext3_commit_super(struct super_block *sb,
2318                                struct ext3_super_block *es,
2319                                int sync)
2320 {
2321         struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
2322         int error = 0;
2323
2324         if (!sbh)
2325                 return error;
2326         es->s_wtime = cpu_to_le32(get_seconds());
2327         es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2328         es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2329         BUFFER_TRACE(sbh, "marking dirty");
2330         mark_buffer_dirty(sbh);
2331         if (sync)
2332                 error = sync_dirty_buffer(sbh);
2333         return error;
2334 }
2335
2336
2337 /*
2338  * Have we just finished recovery?  If so, and if we are mounting (or
2339  * remounting) the filesystem readonly, then we will end up with a
2340  * consistent fs on disk.  Record that fact.
2341  */
2342 static void ext3_mark_recovery_complete(struct super_block * sb,
2343                                         struct ext3_super_block * es)
2344 {
2345         journal_t *journal = EXT3_SB(sb)->s_journal;
2346
2347         journal_lock_updates(journal);
2348         if (journal_flush(journal) < 0)
2349                 goto out;
2350
2351         lock_super(sb);
2352         if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2353             sb->s_flags & MS_RDONLY) {
2354                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2355                 ext3_commit_super(sb, es, 1);
2356         }
2357         unlock_super(sb);
2358
2359 out:
2360         journal_unlock_updates(journal);
2361 }
2362
2363 /*
2364  * If we are mounting (or read-write remounting) a filesystem whose journal
2365  * has recorded an error from a previous lifetime, move that error to the
2366  * main filesystem now.
2367  */
2368 static void ext3_clear_journal_err(struct super_block * sb,
2369                                    struct ext3_super_block * es)
2370 {
2371         journal_t *journal;
2372         int j_errno;
2373         const char *errstr;
2374
2375         journal = EXT3_SB(sb)->s_journal;
2376
2377         /*
2378          * Now check for any error status which may have been recorded in the
2379          * journal by a prior ext3_error() or ext3_abort()
2380          */
2381
2382         j_errno = journal_errno(journal);
2383         if (j_errno) {
2384                 char nbuf[16];
2385
2386                 errstr = ext3_decode_error(sb, j_errno, nbuf);
2387                 ext3_warning(sb, __func__, "Filesystem error recorded "
2388                              "from previous mount: %s", errstr);
2389                 ext3_warning(sb, __func__, "Marking fs in need of "
2390                              "filesystem check.");
2391
2392                 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2393                 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2394                 ext3_commit_super (sb, es, 1);
2395
2396                 journal_clear_err(journal);
2397         }
2398 }
2399
2400 /*
2401  * Force the running and committing transactions to commit,
2402  * and wait on the commit.
2403  */
2404 int ext3_force_commit(struct super_block *sb)
2405 {
2406         journal_t *journal;
2407         int ret;
2408
2409         if (sb->s_flags & MS_RDONLY)
2410                 return 0;
2411
2412         journal = EXT3_SB(sb)->s_journal;
2413         ret = ext3_journal_force_commit(journal);
2414         return ret;
2415 }
2416
2417 static int ext3_sync_fs(struct super_block *sb, int wait)
2418 {
2419         tid_t target;
2420
2421         if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2422                 if (wait)
2423                         log_wait_commit(EXT3_SB(sb)->s_journal, target);
2424         }
2425         return 0;
2426 }
2427
2428 /*
2429  * LVM calls this function before a (read-only) snapshot is created.  This
2430  * gives us a chance to flush the journal completely and mark the fs clean.
2431  */
2432 static int ext3_freeze(struct super_block *sb)
2433 {
2434         int error = 0;
2435         journal_t *journal;
2436
2437         if (!(sb->s_flags & MS_RDONLY)) {
2438                 journal = EXT3_SB(sb)->s_journal;
2439
2440                 /* Now we set up the journal barrier. */
2441                 journal_lock_updates(journal);
2442
2443                 /*
2444                  * We don't want to clear needs_recovery flag when we failed
2445                  * to flush the journal.
2446                  */
2447                 error = journal_flush(journal);
2448                 if (error < 0)
2449                         goto out;
2450
2451                 /* Journal blocked and flushed, clear needs_recovery flag. */
2452                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2453                 error = ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2454                 if (error)
2455                         goto out;
2456         }
2457         return 0;
2458
2459 out:
2460         journal_unlock_updates(journal);
2461         return error;
2462 }
2463
2464 /*
2465  * Called by LVM after the snapshot is done.  We need to reset the RECOVER
2466  * flag here, even though the filesystem is not technically dirty yet.
2467  */
2468 static int ext3_unfreeze(struct super_block *sb)
2469 {
2470         if (!(sb->s_flags & MS_RDONLY)) {
2471                 lock_super(sb);
2472                 /* Reser the needs_recovery flag before the fs is unlocked. */
2473                 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2474                 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2475                 unlock_super(sb);
2476                 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2477         }
2478         return 0;
2479 }
2480
2481 static int ext3_remount (struct super_block * sb, int * flags, char * data)
2482 {
2483         struct ext3_super_block * es;
2484         struct ext3_sb_info *sbi = EXT3_SB(sb);
2485         ext3_fsblk_t n_blocks_count = 0;
2486         unsigned long old_sb_flags;
2487         struct ext3_mount_options old_opts;
2488         int err;
2489 #ifdef CONFIG_QUOTA
2490         int i;
2491 #endif
2492
2493         lock_kernel();
2494
2495         /* Store the original options */
2496         lock_super(sb);
2497         old_sb_flags = sb->s_flags;
2498         old_opts.s_mount_opt = sbi->s_mount_opt;
2499         old_opts.s_resuid = sbi->s_resuid;
2500         old_opts.s_resgid = sbi->s_resgid;
2501         old_opts.s_commit_interval = sbi->s_commit_interval;
2502 #ifdef CONFIG_QUOTA
2503         old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2504         for (i = 0; i < MAXQUOTAS; i++)
2505                 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2506 #endif
2507
2508         /*
2509          * Allow the "check" option to be passed as a remount option.
2510          */
2511         if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2512                 err = -EINVAL;
2513                 goto restore_opts;
2514         }
2515
2516         if (sbi->s_mount_opt & EXT3_MOUNT_ABORT)
2517                 ext3_abort(sb, __func__, "Abort forced by user");
2518
2519         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2520                 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2521
2522         es = sbi->s_es;
2523
2524         ext3_init_journal_params(sb, sbi->s_journal);
2525
2526         if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2527                 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
2528                 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT) {
2529                         err = -EROFS;
2530                         goto restore_opts;
2531                 }
2532
2533                 if (*flags & MS_RDONLY) {
2534                         /*
2535                          * First of all, the unconditional stuff we have to do
2536                          * to disable replay of the journal when we next remount
2537                          */
2538                         sb->s_flags |= MS_RDONLY;
2539
2540                         /*
2541                          * OK, test if we are remounting a valid rw partition
2542                          * readonly, and if so set the rdonly flag and then
2543                          * mark the partition as valid again.
2544                          */
2545                         if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2546                             (sbi->s_mount_state & EXT3_VALID_FS))
2547                                 es->s_state = cpu_to_le16(sbi->s_mount_state);
2548
2549                         /*
2550                          * We have to unlock super so that we can wait for
2551                          * transactions.
2552                          */
2553                         unlock_super(sb);
2554                         ext3_mark_recovery_complete(sb, es);
2555                         lock_super(sb);
2556                 } else {
2557                         __le32 ret;
2558                         if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2559                                         ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2560                                 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2561                                        "remount RDWR because of unsupported "
2562                                        "optional features (%x).\n",
2563                                        sb->s_id, le32_to_cpu(ret));
2564                                 err = -EROFS;
2565                                 goto restore_opts;
2566                         }
2567
2568                         /*
2569                          * If we have an unprocessed orphan list hanging
2570                          * around from a previously readonly bdev mount,
2571                          * require a full umount/remount for now.
2572                          */
2573                         if (es->s_last_orphan) {
2574                                 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2575                                        "remount RDWR because of unprocessed "
2576                                        "orphan inode list.  Please "
2577                                        "umount/remount instead.\n",
2578                                        sb->s_id);
2579                                 err = -EINVAL;
2580                                 goto restore_opts;
2581                         }
2582
2583                         /*
2584                          * Mounting a RDONLY partition read-write, so reread
2585                          * and store the current valid flag.  (It may have
2586                          * been changed by e2fsck since we originally mounted
2587                          * the partition.)
2588                          */
2589                         ext3_clear_journal_err(sb, es);
2590                         sbi->s_mount_state = le16_to_cpu(es->s_state);
2591                         if ((err = ext3_group_extend(sb, es, n_blocks_count)))
2592                                 goto restore_opts;
2593                         if (!ext3_setup_super (sb, es, 0))
2594                                 sb->s_flags &= ~MS_RDONLY;
2595                 }
2596         }
2597 #ifdef CONFIG_QUOTA
2598         /* Release old quota file names */
2599         for (i = 0; i < MAXQUOTAS; i++)
2600                 if (old_opts.s_qf_names[i] &&
2601                     old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2602                         kfree(old_opts.s_qf_names[i]);
2603 #endif
2604         unlock_super(sb);
2605         unlock_kernel();
2606         return 0;
2607 restore_opts:
2608         sb->s_flags = old_sb_flags;
2609         sbi->s_mount_opt = old_opts.s_mount_opt;
2610         sbi->s_resuid = old_opts.s_resuid;
2611         sbi->s_resgid = old_opts.s_resgid;
2612         sbi->s_commit_interval = old_opts.s_commit_interval;
2613 #ifdef CONFIG_QUOTA
2614         sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2615         for (i = 0; i < MAXQUOTAS; i++) {
2616                 if (sbi->s_qf_names[i] &&
2617                     old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2618                         kfree(sbi->s_qf_names[i]);
2619                 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2620         }
2621 #endif
2622         unlock_super(sb);
2623         unlock_kernel();
2624         return err;
2625 }
2626
2627 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
2628 {
2629         struct super_block *sb = dentry->d_sb;
2630         struct ext3_sb_info *sbi = EXT3_SB(sb);
2631         struct ext3_super_block *es = sbi->s_es;
2632         u64 fsid;
2633
2634         if (test_opt(sb, MINIX_DF)) {
2635                 sbi->s_overhead_last = 0;
2636         } else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
2637                 unsigned long ngroups = sbi->s_groups_count, i;
2638                 ext3_fsblk_t overhead = 0;
2639                 smp_rmb();
2640
2641                 /*
2642                  * Compute the overhead (FS structures).  This is constant
2643                  * for a given filesystem unless the number of block groups
2644                  * changes so we cache the previous value until it does.
2645                  */
2646
2647                 /*
2648                  * All of the blocks before first_data_block are
2649                  * overhead
2650                  */
2651                 overhead = le32_to_cpu(es->s_first_data_block);
2652
2653                 /*
2654                  * Add the overhead attributed to the superblock and
2655                  * block group descriptors.  If the sparse superblocks
2656                  * feature is turned on, then not all groups have this.
2657                  */
2658                 for (i = 0; i < ngroups; i++) {
2659                         overhead += ext3_bg_has_super(sb, i) +
2660                                 ext3_bg_num_gdb(sb, i);
2661                         cond_resched();
2662                 }
2663
2664                 /*
2665                  * Every block group has an inode bitmap, a block
2666                  * bitmap, and an inode table.
2667                  */
2668                 overhead += ngroups * (2 + sbi->s_itb_per_group);
2669                 sbi->s_overhead_last = overhead;
2670                 smp_wmb();
2671                 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
2672         }
2673
2674         buf->f_type = EXT3_SUPER_MAGIC;
2675         buf->f_bsize = sb->s_blocksize;
2676         buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
2677         buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
2678         es->s_free_blocks_count = cpu_to_le32(buf->f_bfree);
2679         buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2680         if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2681                 buf->f_bavail = 0;
2682         buf->f_files = le32_to_cpu(es->s_inodes_count);
2683         buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
2684         es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
2685         buf->f_namelen = EXT3_NAME_LEN;
2686         fsid = le64_to_cpup((void *)es->s_uuid) ^
2687                le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2688         buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2689         buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
2690         return 0;
2691 }
2692
2693 /* Helper function for writing quotas on sync - we need to start transaction before quota file
2694  * is locked for write. Otherwise the are possible deadlocks:
2695  * Process 1                         Process 2
2696  * ext3_create()                     quota_sync()
2697  *   journal_start()                   write_dquot()
2698  *   vfs_dq_init()                       down(dqio_mutex)
2699  *     down(dqio_mutex)                    journal_start()
2700  *
2701  */
2702
2703 #ifdef CONFIG_QUOTA
2704
2705 static inline struct inode *dquot_to_inode(struct dquot *dquot)
2706 {
2707         return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2708 }
2709
2710 static int ext3_write_dquot(struct dquot *dquot)
2711 {
2712         int ret, err;
2713         handle_t *handle;
2714         struct inode *inode;
2715
2716         inode = dquot_to_inode(dquot);
2717         handle = ext3_journal_start(inode,
2718                                         EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2719         if (IS_ERR(handle))
2720                 return PTR_ERR(handle);
2721         ret = dquot_commit(dquot);
2722         err = ext3_journal_stop(handle);
2723         if (!ret)
2724                 ret = err;
2725         return ret;
2726 }
2727
2728 static int ext3_acquire_dquot(struct dquot *dquot)
2729 {
2730         int ret, err;
2731         handle_t *handle;
2732
2733         handle = ext3_journal_start(dquot_to_inode(dquot),
2734                                         EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2735         if (IS_ERR(handle))
2736                 return PTR_ERR(handle);
2737         ret = dquot_acquire(dquot);
2738         err = ext3_journal_stop(handle);
2739         if (!ret)
2740                 ret = err;
2741         return ret;
2742 }
2743
2744 static int ext3_release_dquot(struct dquot *dquot)
2745 {
2746         int ret, err;
2747         handle_t *handle;
2748
2749         handle = ext3_journal_start(dquot_to_inode(dquot),
2750                                         EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2751         if (IS_ERR(handle)) {
2752                 /* Release dquot anyway to avoid endless cycle in dqput() */
2753                 dquot_release(dquot);
2754                 return PTR_ERR(handle);
2755         }
2756         ret = dquot_release(dquot);
2757         err = ext3_journal_stop(handle);
2758         if (!ret)
2759                 ret = err;
2760         return ret;
2761 }
2762
2763 static int ext3_mark_dquot_dirty(struct dquot *dquot)
2764 {
2765         /* Are we journaling quotas? */
2766         if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2767             EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2768                 dquot_mark_dquot_dirty(dquot);
2769                 return ext3_write_dquot(dquot);
2770         } else {
2771                 return dquot_mark_dquot_dirty(dquot);
2772         }
2773 }
2774
2775 static int ext3_write_info(struct super_block *sb, int type)
2776 {
2777         int ret, err;
2778         handle_t *handle;
2779
2780         /* Data block + inode block */
2781         handle = ext3_journal_start(sb->s_root->d_inode, 2);
2782         if (IS_ERR(handle))
2783                 return PTR_ERR(handle);
2784         ret = dquot_commit_info(sb, type);
2785         err = ext3_journal_stop(handle);
2786         if (!ret)
2787                 ret = err;
2788         return ret;
2789 }
2790
2791 /*
2792  * Turn on quotas during mount time - we need to find
2793  * the quota file and such...
2794  */
2795 static int ext3_quota_on_mount(struct super_block *sb, int type)
2796 {
2797         return vfs_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2798                         EXT3_SB(sb)->s_jquota_fmt, type);
2799 }
2800
2801 /*
2802  * Standard function to be called on quota_on
2803  */
2804 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
2805                          char *name, int remount)
2806 {
2807         int err;
2808         struct path path;
2809
2810         if (!test_opt(sb, QUOTA))
2811                 return -EINVAL;
2812         /* When remounting, no checks are needed and in fact, name is NULL */
2813         if (remount)
2814                 return vfs_quota_on(sb, type, format_id, name, remount);
2815
2816         err = kern_path(name, LOOKUP_FOLLOW, &path);
2817         if (err)
2818                 return err;
2819
2820         /* Quotafile not on the same filesystem? */
2821         if (path.mnt->mnt_sb != sb) {
2822                 path_put(&path);
2823                 return -EXDEV;
2824         }
2825         /* Journaling quota? */
2826         if (EXT3_SB(sb)->s_qf_names[type]) {
2827                 /* Quotafile not of fs root? */
2828                 if (path.dentry->d_parent != sb->s_root)
2829                         printk(KERN_WARNING
2830                                 "EXT3-fs: Quota file not on filesystem root. "
2831                                 "Journaled quota will not work.\n");
2832         }
2833
2834         /*
2835          * When we journal data on quota file, we have to flush journal to see
2836          * all updates to the file when we bypass pagecache...
2837          */
2838         if (ext3_should_journal_data(path.dentry->d_inode)) {
2839                 /*
2840                  * We don't need to lock updates but journal_flush() could
2841                  * otherwise be livelocked...
2842                  */
2843                 journal_lock_updates(EXT3_SB(sb)->s_journal);
2844                 err = journal_flush(EXT3_SB(sb)->s_journal);
2845                 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2846                 if (err) {
2847                         path_put(&path);
2848                         return err;
2849                 }
2850         }
2851
2852         err = vfs_quota_on_path(sb, type, format_id, &path);
2853         path_put(&path);
2854         return err;
2855 }
2856
2857 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2858  * acquiring the locks... As quota files are never truncated and quota code
2859  * itself serializes the operations (and noone else should touch the files)
2860  * we don't have to be afraid of races */
2861 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2862                                size_t len, loff_t off)
2863 {
2864         struct inode *inode = sb_dqopt(sb)->files[type];
2865         sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2866         int err = 0;
2867         int offset = off & (sb->s_blocksize - 1);
2868         int tocopy;
2869         size_t toread;
2870         struct buffer_head *bh;
2871         loff_t i_size = i_size_read(inode);
2872
2873         if (off > i_size)
2874                 return 0;
2875         if (off+len > i_size)
2876                 len = i_size-off;
2877         toread = len;
2878         while (toread > 0) {
2879                 tocopy = sb->s_blocksize - offset < toread ?
2880                                 sb->s_blocksize - offset : toread;
2881                 bh = ext3_bread(NULL, inode, blk, 0, &err);
2882                 if (err)
2883                         return err;
2884                 if (!bh)        /* A hole? */
2885                         memset(data, 0, tocopy);
2886                 else
2887                         memcpy(data, bh->b_data+offset, tocopy);
2888                 brelse(bh);
2889                 offset = 0;
2890                 toread -= tocopy;
2891                 data += tocopy;
2892                 blk++;
2893         }
2894         return len;
2895 }
2896
2897 /* Write to quotafile (we know the transaction is already started and has
2898  * enough credits) */
2899 static ssize_t ext3_quota_write(struct super_block *sb, int type,
2900                                 const char *data, size_t len, loff_t off)
2901 {
2902         struct inode *inode = sb_dqopt(sb)->files[type];
2903         sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2904         int err = 0;
2905         int offset = off & (sb->s_blocksize - 1);
2906         int tocopy;
2907         int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
2908         size_t towrite = len;
2909         struct buffer_head *bh;
2910         handle_t *handle = journal_current_handle();
2911
2912         if (!handle) {
2913                 printk(KERN_WARNING "EXT3-fs: Quota write (off=%Lu, len=%Lu)"
2914                         " cancelled because transaction is not started.\n",
2915                         (unsigned long long)off, (unsigned long long)len);
2916                 return -EIO;
2917         }
2918         mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2919         while (towrite > 0) {
2920                 tocopy = sb->s_blocksize - offset < towrite ?
2921                                 sb->s_blocksize - offset : towrite;
2922                 bh = ext3_bread(handle, inode, blk, 1, &err);
2923                 if (!bh)
2924                         goto out;
2925                 if (journal_quota) {
2926                         err = ext3_journal_get_write_access(handle, bh);
2927                         if (err) {
2928                                 brelse(bh);
2929                                 goto out;
2930                         }
2931                 }
2932                 lock_buffer(bh);
2933                 memcpy(bh->b_data+offset, data, tocopy);
2934                 flush_dcache_page(bh->b_page);
2935                 unlock_buffer(bh);
2936                 if (journal_quota)
2937                         err = ext3_journal_dirty_metadata(handle, bh);
2938                 else {
2939                         /* Always do at least ordered writes for quotas */
2940                         err = ext3_journal_dirty_data(handle, bh);
2941                         mark_buffer_dirty(bh);
2942                 }
2943                 brelse(bh);
2944                 if (err)
2945                         goto out;
2946                 offset = 0;
2947                 towrite -= tocopy;
2948                 data += tocopy;
2949                 blk++;
2950         }
2951 out:
2952         if (len == towrite) {
2953                 mutex_unlock(&inode->i_mutex);
2954                 return err;
2955         }
2956         if (inode->i_size < off+len-towrite) {
2957                 i_size_write(inode, off+len-towrite);
2958                 EXT3_I(inode)->i_disksize = inode->i_size;
2959         }
2960         inode->i_version++;
2961         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2962         ext3_mark_inode_dirty(handle, inode);
2963         mutex_unlock(&inode->i_mutex);
2964         return len - towrite;
2965 }
2966
2967 #endif
2968
2969 static int ext3_get_sb(struct file_system_type *fs_type,
2970         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
2971 {
2972         return get_sb_bdev(fs_type, flags, dev_name, data, ext3_fill_super, mnt);
2973 }
2974
2975 static struct file_system_type ext3_fs_type = {
2976         .owner          = THIS_MODULE,
2977         .name           = "ext3",
2978         .get_sb         = ext3_get_sb,
2979         .kill_sb        = kill_block_super,
2980         .fs_flags       = FS_REQUIRES_DEV,
2981 };
2982
2983 static int __init init_ext3_fs(void)
2984 {
2985         int err = init_ext3_xattr();
2986         if (err)
2987                 return err;
2988         err = init_inodecache();
2989         if (err)
2990                 goto out1;
2991         err = register_filesystem(&ext3_fs_type);
2992         if (err)
2993                 goto out;
2994         return 0;
2995 out:
2996         destroy_inodecache();
2997 out1:
2998         exit_ext3_xattr();
2999         return err;
3000 }
3001
3002 static void __exit exit_ext3_fs(void)
3003 {
3004         unregister_filesystem(&ext3_fs_type);
3005         destroy_inodecache();
3006         exit_ext3_xattr();
3007 }
3008
3009 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
3010 MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
3011 MODULE_LICENSE("GPL");
3012 module_init(init_ext3_fs)
3013 module_exit(exit_ext3_fs)