fs/ext3/super.c

   1 /*
   2  *  linux/fs/ext3/super.c
   3  *
   4  * Copyright (C) 1992, 1993, 1994, 1995
   5  * Remy Card (card@masi.ibp.fr)
   6  * Laboratoire MASI - Institut Blaise Pascal
   7  * Universite Pierre et Marie Curie (Paris VI)
   8  *
   9  *  from
  10  *
  11  *  linux/fs/minix/inode.c
  12  *
  13  *  Copyright (C) 1991, 1992  Linus Torvalds
  14  *
  15  *  Big-endian to little-endian byte-swapping/bitmaps by
  16  *        David S. Miller (davem@caip.rutgers.edu), 1995
  17  */
  18
  19 #include <linux/module.h>
  20 #include <linux/string.h>
  21 #include <linux/fs.h>
  22 #include <linux/time.h>
  23 #include <linux/jbd.h>
  24 #include <linux/ext3_fs.h>
  25 #include <linux/ext3_jbd.h>
  26 #include <linux/slab.h>
  27 #include <linux/init.h>
  28 #include <linux/blkdev.h>
  29 #include <linux/parser.h>
  30 #include <linux/smp_lock.h>
  31 #include <linux/buffer_head.h>
  32 #include <linux/exportfs.h>
  33 #include <linux/vfs.h>
  34 #include <linux/random.h>
  35 #include <linux/mount.h>
  36 #include <linux/namei.h>
  37 #include <linux/quotaops.h>
  38 #include <linux/seq_file.h>
  39 #include <linux/log2.h>
  40
  41 #include <asm/uaccess.h>
  42
  43 #include "xattr.h"
  44 #include "acl.h"
  45 #include "namei.h"
  46
  47 #ifdef CONFIG_EXT3_DEFAULTS_TO_ORDERED
  48   #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_ORDERED_DATA
  49 #else
  50   #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_WRITEBACK_DATA
  51 #endif
  52
  53 static int ext3_load_journal(struct super_block *, struct ext3_super_block *,
  54                              unsigned long journal_devnum);
  55 static int ext3_create_journal(struct super_block *, struct ext3_super_block *,
  56                                unsigned int);
  57 static int ext3_commit_super(struct super_block *sb,
  58                                struct ext3_super_block *es,
  59                                int sync);
  60 static void ext3_mark_recovery_complete(struct super_block * sb,
  61                                         struct ext3_super_block * es);
  62 static void ext3_clear_journal_err(struct super_block * sb,
  63                                    struct ext3_super_block * es);
  64 static int ext3_sync_fs(struct super_block *sb, int wait);
  65 static const char *ext3_decode_error(struct super_block * sb, int errno,
  66                                      char nbuf[16]);
  67 static int ext3_remount (struct super_block * sb, int * flags, char * data);
  68 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf);
  69 static int ext3_unfreeze(struct super_block *sb);
  70 static int ext3_freeze(struct super_block *sb);
  71
  72 /*
  73  * Wrappers for journal_start/end.
  74  *
  75  * The only special thing we need to do here is to make sure that all
  76  * journal_end calls result in the superblock being marked dirty, so
  77  * that sync() will call the filesystem's write_super callback if
  78  * appropriate.
  79  */
  80 handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks)
  81 {
  82         journal_t *journal;
  83
  84         if (sb->s_flags & MS_RDONLY)
  85                 return ERR_PTR(-EROFS);
  86
  87         /* Special case here: if the journal has aborted behind our
  88          * backs (eg. EIO in the commit thread), then we still need to
  89          * take the FS itself readonly cleanly. */
  90         journal = EXT3_SB(sb)->s_journal;
  91         if (is_journal_aborted(journal)) {
  92                 ext3_abort(sb, __func__,
  93                            "Detected aborted journal");
  94                 return ERR_PTR(-EROFS);
  95         }
  96
  97         return journal_start(journal, nblocks);
  98 }
  99
 100 /*
 101  * The only special thing we need to do here is to make sure that all
 102  * journal_stop calls result in the superblock being marked dirty, so
 103  * that sync() will call the filesystem's write_super callback if
 104  * appropriate.
 105  */
 106 int __ext3_journal_stop(const char *where, handle_t *handle)
 107 {
 108         struct super_block *sb;
 109         int err;
 110         int rc;
 111
 112         sb = handle->h_transaction->t_journal->j_private;
 113         err = handle->h_err;
 114         rc = journal_stop(handle);
 115
 116         if (!err)
 117                 err = rc;
 118         if (err)
 119                 __ext3_std_error(sb, where, err);
 120         return err;
 121 }
 122
 123 void ext3_journal_abort_handle(const char *caller, const char *err_fn,
 124                 struct buffer_head *bh, handle_t *handle, int err)
 125 {
 126         char nbuf[16];
 127         const char *errstr = ext3_decode_error(NULL, err, nbuf);
 128
 129         if (bh)
 130                 BUFFER_TRACE(bh, "abort");
 131
 132         if (!handle->h_err)
 133                 handle->h_err = err;
 134
 135         if (is_handle_aborted(handle))
 136                 return;
 137
 138         printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
 139                caller, errstr, err_fn);
 140
 141         journal_abort_handle(handle);
 142 }
 143
 144 /* Deal with the reporting of failure conditions on a filesystem such as
 145  * inconsistencies detected or read IO failures.
 146  *
 147  * On ext2, we can store the error state of the filesystem in the
 148  * superblock.  That is not possible on ext3, because we may have other
 149  * write ordering constraints on the superblock which prevent us from
 150  * writing it out straight away; and given that the journal is about to
 151  * be aborted, we can't rely on the current, or future, transactions to
 152  * write out the superblock safely.
 153  *
 154  * We'll just use the journal_abort() error code to record an error in
 155  * the journal instead.  On recovery, the journal will compain about
 156  * that error until we've noted it down and cleared it.
 157  */
 158
 159 static void ext3_handle_error(struct super_block *sb)
 160 {
 161         struct ext3_super_block *es = EXT3_SB(sb)->s_es;
 162
 163         EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
 164         es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
 165
 166         if (sb->s_flags & MS_RDONLY)
 167                 return;
 168
 169         if (!test_opt (sb, ERRORS_CONT)) {
 170                 journal_t *journal = EXT3_SB(sb)->s_journal;
 171
 172                 EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
 173                 if (journal)
 174                         journal_abort(journal, -EIO);
 175         }
 176         if (test_opt (sb, ERRORS_RO)) {
 177                 printk (KERN_CRIT "Remounting filesystem read-only\n");
 178                 sb->s_flags |= MS_RDONLY;
 179         }
 180         ext3_commit_super(sb, es, 1);
 181         if (test_opt(sb, ERRORS_PANIC))
 182                 panic("EXT3-fs (device %s): panic forced after error\n",
 183                         sb->s_id);
 184 }
 185
 186 void ext3_error (struct super_block * sb, const char * function,
 187                  const char * fmt, ...)
 188 {
 189         va_list args;
 190
 191         va_start(args, fmt);
 192         printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
 193         vprintk(fmt, args);
 194         printk("\n");
 195         va_end(args);
 196
 197         ext3_handle_error(sb);
 198 }
 199
 200 static const char *ext3_decode_error(struct super_block * sb, int errno,
 201                                      char nbuf[16])
 202 {
 203         char *errstr = NULL;
 204
 205         switch (errno) {
 206         case -EIO:
 207                 errstr = "IO failure";
 208                 break;
 209         case -ENOMEM:
 210                 errstr = "Out of memory";
 211                 break;
 212         case -EROFS:
 213                 if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT)
 214                         errstr = "Journal has aborted";
 215                 else
 216                         errstr = "Readonly filesystem";
 217                 break;
 218         default:
 219                 /* If the caller passed in an extra buffer for unknown
 220                  * errors, textualise them now.  Else we just return
 221                  * NULL. */
 222                 if (nbuf) {
 223                         /* Check for truncated error codes... */
 224                         if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
 225                                 errstr = nbuf;
 226                 }
 227                 break;
 228         }
 229
 230         return errstr;
 231 }
 232
 233 /* __ext3_std_error decodes expected errors from journaling functions
 234  * automatically and invokes the appropriate error response.  */
 235
 236 void __ext3_std_error (struct super_block * sb, const char * function,
 237                        int errno)
 238 {
 239         char nbuf[16];
 240         const char *errstr;
 241
 242         /* Special case: if the error is EROFS, and we're not already
 243          * inside a transaction, then there's really no point in logging
 244          * an error. */
 245         if (errno == -EROFS && journal_current_handle() == NULL &&
 246             (sb->s_flags & MS_RDONLY))
 247                 return;
 248
 249         errstr = ext3_decode_error(sb, errno, nbuf);
 250         printk (KERN_CRIT "EXT3-fs error (device %s) in %s: %s\n",
 251                 sb->s_id, function, errstr);
 252
 253         ext3_handle_error(sb);
 254 }
 255
 256 /*
 257  * ext3_abort is a much stronger failure handler than ext3_error.  The
 258  * abort function may be used to deal with unrecoverable failures such
 259  * as journal IO errors or ENOMEM at a critical moment in log management.
 260  *
 261  * We unconditionally force the filesystem into an ABORT|READONLY state,
 262  * unless the error response on the fs has been set to panic in which
 263  * case we take the easy way out and panic immediately.
 264  */
 265
 266 void ext3_abort (struct super_block * sb, const char * function,
 267                  const char * fmt, ...)
 268 {
 269         va_list args;
 270
 271         printk (KERN_CRIT "ext3_abort called.\n");
 272
 273         va_start(args, fmt);
 274         printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
 275         vprintk(fmt, args);
 276         printk("\n");
 277         va_end(args);
 278
 279         if (test_opt(sb, ERRORS_PANIC))
 280                 panic("EXT3-fs panic from previous error\n");
 281
 282         if (sb->s_flags & MS_RDONLY)
 283                 return;
 284
 285         printk(KERN_CRIT "Remounting filesystem read-only\n");
 286         EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
 287         sb->s_flags |= MS_RDONLY;
 288         EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
 289         if (EXT3_SB(sb)->s_journal)
 290                 journal_abort(EXT3_SB(sb)->s_journal, -EIO);
 291 }
 292
 293 void ext3_warning (struct super_block * sb, const char * function,
 294                    const char * fmt, ...)
 295 {
 296         va_list args;
 297
 298         va_start(args, fmt);
 299         printk(KERN_WARNING "EXT3-fs warning (device %s): %s: ",
 300                sb->s_id, function);
 301         vprintk(fmt, args);
 302         printk("\n");
 303         va_end(args);
 304 }
 305
 306 void ext3_update_dynamic_rev(struct super_block *sb)
 307 {
 308         struct ext3_super_block *es = EXT3_SB(sb)->s_es;
 309
 310         if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
 311                 return;
 312
 313         ext3_warning(sb, __func__,
 314                      "updating to rev %d because of new feature flag, "
 315                      "running e2fsck is recommended",
 316                      EXT3_DYNAMIC_REV);
 317
 318         es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO);
 319         es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE);
 320         es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV);
 321         /* leave es->s_feature_*compat flags alone */
 322         /* es->s_uuid will be set by e2fsck if empty */
 323
 324         /*
 325          * The rest of the superblock fields should be zero, and if not it
 326          * means they are likely already in use, so leave them alone.  We
 327          * can leave it up to e2fsck to clean up any inconsistencies there.
 328          */
 329 }
 330
 331 /*
 332  * Open the external journal device
 333  */
 334 static struct block_device *ext3_blkdev_get(dev_t dev)
 335 {
 336         struct block_device *bdev;
 337         char b[BDEVNAME_SIZE];
 338
 339         bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
 340         if (IS_ERR(bdev))
 341                 goto fail;
 342         return bdev;
 343
 344 fail:
 345         printk(KERN_ERR "EXT3: failed to open journal device %s: %ld\n",
 346                         __bdevname(dev, b), PTR_ERR(bdev));
 347         return NULL;
 348 }
 349
 350 /*
 351  * Release the journal device
 352  */
 353 static int ext3_blkdev_put(struct block_device *bdev)
 354 {
 355         bd_release(bdev);
 356         return blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
 357 }
 358
 359 static int ext3_blkdev_remove(struct ext3_sb_info *sbi)
 360 {
 361         struct block_device *bdev;
 362         int ret = -ENODEV;
 363
 364         bdev = sbi->journal_bdev;
 365         if (bdev) {
 366                 ret = ext3_blkdev_put(bdev);
 367                 sbi->journal_bdev = NULL;
 368         }
 369         return ret;
 370 }
 371
 372 static inline struct inode *orphan_list_entry(struct list_head *l)
 373 {
 374         return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
 375 }
 376
 377 static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
 378 {
 379         struct list_head *l;
 380
 381         printk(KERN_ERR "sb orphan head is %d\n",
 382                le32_to_cpu(sbi->s_es->s_last_orphan));
 383
 384         printk(KERN_ERR "sb_info orphan list:\n");
 385         list_for_each(l, &sbi->s_orphan) {
 386                 struct inode *inode = orphan_list_entry(l);
 387                 printk(KERN_ERR "  "
 388                        "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
 389                        inode->i_sb->s_id, inode->i_ino, inode,
 390                        inode->i_mode, inode->i_nlink,
 391                        NEXT_ORPHAN(inode));
 392         }
 393 }
 394
 395 static void ext3_put_super (struct super_block * sb)
 396 {
 397         struct ext3_sb_info *sbi = EXT3_SB(sb);
 398         struct ext3_super_block *es = sbi->s_es;
 399         int i, err;
 400
 401         lock_kernel();
 402
 403         ext3_xattr_put_super(sb);
 404         err = journal_destroy(sbi->s_journal);
 405         sbi->s_journal = NULL;
 406         if (err < 0)
 407                 ext3_abort(sb, __func__, "Couldn't clean up the journal");
 408
 409         if (!(sb->s_flags & MS_RDONLY)) {
 410                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
 411                 es->s_state = cpu_to_le16(sbi->s_mount_state);
 412                 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
 413                 mark_buffer_dirty(sbi->s_sbh);
 414                 ext3_commit_super(sb, es, 1);
 415         }
 416
 417         for (i = 0; i < sbi->s_gdb_count; i++)
 418                 brelse(sbi->s_group_desc[i]);
 419         kfree(sbi->s_group_desc);
 420         percpu_counter_destroy(&sbi->s_freeblocks_counter);
 421         percpu_counter_destroy(&sbi->s_freeinodes_counter);
 422         percpu_counter_destroy(&sbi->s_dirs_counter);
 423         brelse(sbi->s_sbh);
 424 #ifdef CONFIG_QUOTA
 425         for (i = 0; i < MAXQUOTAS; i++)
 426                 kfree(sbi->s_qf_names[i]);
 427 #endif
 428
 429         /* Debugging code just in case the in-memory inode orphan list
 430          * isn't empty.  The on-disk one can be non-empty if we've
 431          * detected an error and taken the fs readonly, but the
 432          * in-memory list had better be clean by this point. */
 433         if (!list_empty(&sbi->s_orphan))
 434                 dump_orphan_list(sb, sbi);
 435         J_ASSERT(list_empty(&sbi->s_orphan));
 436
 437         invalidate_bdev(sb->s_bdev);
 438         if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
 439                 /*
 440                  * Invalidate the journal device's buffers.  We don't want them
 441                  * floating about in memory - the physical journal device may
 442                  * hotswapped, and it breaks the `ro-after' testing code.
 443                  */
 444                 sync_blockdev(sbi->journal_bdev);
 445                 invalidate_bdev(sbi->journal_bdev);
 446                 ext3_blkdev_remove(sbi);
 447         }
 448         sb->s_fs_info = NULL;
 449         kfree(sbi->s_blockgroup_lock);
 450         kfree(sbi);
 451
 452         unlock_kernel();
 453 }
 454
 455 static struct kmem_cache *ext3_inode_cachep;
 456
 457 /*
 458  * Called inside transaction, so use GFP_NOFS
 459  */
 460 static struct inode *ext3_alloc_inode(struct super_block *sb)
 461 {
 462         struct ext3_inode_info *ei;
 463
 464         ei = kmem_cache_alloc(ext3_inode_cachep, GFP_NOFS);
 465         if (!ei)
 466                 return NULL;
 467         ei->i_block_alloc_info = NULL;
 468         ei->vfs_inode.i_version = 1;
 469         return &ei->vfs_inode;
 470 }
 471
 472 static void ext3_destroy_inode(struct inode *inode)
 473 {
 474         if (!list_empty(&(EXT3_I(inode)->i_orphan))) {
 475                 printk("EXT3 Inode %p: orphan list check failed!\n",
 476                         EXT3_I(inode));
 477                 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
 478                                 EXT3_I(inode), sizeof(struct ext3_inode_info),
 479                                 false);
 480                 dump_stack();
 481         }
 482         kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
 483 }
 484
 485 static void init_once(void *foo)
 486 {
 487         struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
 488
 489         INIT_LIST_HEAD(&ei->i_orphan);
 490 #ifdef CONFIG_EXT3_FS_XATTR
 491         init_rwsem(&ei->xattr_sem);
 492 #endif
 493         mutex_init(&ei->truncate_mutex);
 494         inode_init_once(&ei->vfs_inode);
 495 }
 496
 497 static int init_inodecache(void)
 498 {
 499         ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
 500                                              sizeof(struct ext3_inode_info),
 501                                              0, (SLAB_RECLAIM_ACCOUNT|
 502                                                 SLAB_MEM_SPREAD),
 503                                              init_once);
 504         if (ext3_inode_cachep == NULL)
 505                 return -ENOMEM;
 506         return 0;
 507 }
 508
 509 static void destroy_inodecache(void)
 510 {
 511         kmem_cache_destroy(ext3_inode_cachep);
 512 }
 513
 514 static void ext3_clear_inode(struct inode *inode)
 515 {
 516         struct ext3_block_alloc_info *rsv = EXT3_I(inode)->i_block_alloc_info;
 517         ext3_discard_reservation(inode);
 518         EXT3_I(inode)->i_block_alloc_info = NULL;
 519         if (unlikely(rsv))
 520                 kfree(rsv);
 521 }
 522
 523 static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
 524 {
 525 #if defined(CONFIG_QUOTA)
 526         struct ext3_sb_info *sbi = EXT3_SB(sb);
 527
 528         if (sbi->s_jquota_fmt)
 529                 seq_printf(seq, ",jqfmt=%s",
 530                 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0");
 531
 532         if (sbi->s_qf_names[USRQUOTA])
 533                 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
 534
 535         if (sbi->s_qf_names[GRPQUOTA])
 536                 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
 537
 538         if (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA)
 539                 seq_puts(seq, ",usrquota");
 540
 541         if (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)
 542                 seq_puts(seq, ",grpquota");
 543 #endif
 544 }
 545
 546 /*
 547  * Show an option if
 548  *  - it's set to a non-default value OR
 549  *  - if the per-sb default is different from the global default
 550  */
 551 static int ext3_show_options(struct seq_file *seq, struct vfsmount *vfs)
 552 {
 553         struct super_block *sb = vfs->mnt_sb;
 554         struct ext3_sb_info *sbi = EXT3_SB(sb);
 555         struct ext3_super_block *es = sbi->s_es;
 556         unsigned long def_mount_opts;
 557
 558         def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
 559
 560         if (sbi->s_sb_block != 1)
 561                 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
 562         if (test_opt(sb, MINIX_DF))
 563                 seq_puts(seq, ",minixdf");
 564         if (test_opt(sb, GRPID))
 565                 seq_puts(seq, ",grpid");
 566         if (!test_opt(sb, GRPID) && (def_mount_opts & EXT3_DEFM_BSDGROUPS))
 567                 seq_puts(seq, ",nogrpid");
 568         if (sbi->s_resuid != EXT3_DEF_RESUID ||
 569             le16_to_cpu(es->s_def_resuid) != EXT3_DEF_RESUID) {
 570                 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
 571         }
 572         if (sbi->s_resgid != EXT3_DEF_RESGID ||
 573             le16_to_cpu(es->s_def_resgid) != EXT3_DEF_RESGID) {
 574                 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
 575         }
 576         if (test_opt(sb, ERRORS_RO)) {
 577                 int def_errors = le16_to_cpu(es->s_errors);
 578
 579                 if (def_errors == EXT3_ERRORS_PANIC ||
 580                     def_errors == EXT3_ERRORS_CONTINUE) {
 581                         seq_puts(seq, ",errors=remount-ro");
 582                 }
 583         }
 584         if (test_opt(sb, ERRORS_CONT))
 585                 seq_puts(seq, ",errors=continue");
 586         if (test_opt(sb, ERRORS_PANIC))
 587                 seq_puts(seq, ",errors=panic");
 588         if (test_opt(sb, NO_UID32))
 589                 seq_puts(seq, ",nouid32");
 590         if (test_opt(sb, DEBUG))
 591                 seq_puts(seq, ",debug");
 592         if (test_opt(sb, OLDALLOC))
 593                 seq_puts(seq, ",oldalloc");
 594 #ifdef CONFIG_EXT3_FS_XATTR
 595         if (test_opt(sb, XATTR_USER))
 596                 seq_puts(seq, ",user_xattr");
 597         if (!test_opt(sb, XATTR_USER) &&
 598             (def_mount_opts & EXT3_DEFM_XATTR_USER)) {
 599                 seq_puts(seq, ",nouser_xattr");
 600         }
 601 #endif
 602 #ifdef CONFIG_EXT3_FS_POSIX_ACL
 603         if (test_opt(sb, POSIX_ACL))
 604                 seq_puts(seq, ",acl");
 605         if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT3_DEFM_ACL))
 606                 seq_puts(seq, ",noacl");
 607 #endif
 608         if (!test_opt(sb, RESERVATION))
 609                 seq_puts(seq, ",noreservation");
 610         if (sbi->s_commit_interval) {
 611                 seq_printf(seq, ",commit=%u",
 612                            (unsigned) (sbi->s_commit_interval / HZ));
 613         }
 614         if (test_opt(sb, BARRIER))
 615                 seq_puts(seq, ",barrier=1");
 616         if (test_opt(sb, NOBH))
 617                 seq_puts(seq, ",nobh");
 618
 619         if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA)
 620                 seq_puts(seq, ",data=journal");
 621         else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA)
 622                 seq_puts(seq, ",data=ordered");
 623         else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)
 624                 seq_puts(seq, ",data=writeback");
 625
 626         if (test_opt(sb, DATA_ERR_ABORT))
 627                 seq_puts(seq, ",data_err=abort");
 628
 629         ext3_show_quota_options(seq, sb);
 630
 631         return 0;
 632 }
 633
 634
 635 static struct inode *ext3_nfs_get_inode(struct super_block *sb,
 636                 u64 ino, u32 generation)
 637 {
 638         struct inode *inode;
 639
 640         if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO)
 641                 return ERR_PTR(-ESTALE);
 642         if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count))
 643                 return ERR_PTR(-ESTALE);
 644
 645         /* iget isn't really right if the inode is currently unallocated!!
 646          *
 647          * ext3_read_inode will return a bad_inode if the inode had been
 648          * deleted, so we should be safe.
 649          *
 650          * Currently we don't know the generation for parent directory, so
 651          * a generation of 0 means "accept any"
 652          */
 653         inode = ext3_iget(sb, ino);
 654         if (IS_ERR(inode))
 655                 return ERR_CAST(inode);
 656         if (generation && inode->i_generation != generation) {
 657                 iput(inode);
 658                 return ERR_PTR(-ESTALE);
 659         }
 660
 661         return inode;
 662 }
 663
 664 static struct dentry *ext3_fh_to_dentry(struct super_block *sb, struct fid *fid,
 665                 int fh_len, int fh_type)
 666 {
 667         return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
 668                                     ext3_nfs_get_inode);
 669 }
 670
 671 static struct dentry *ext3_fh_to_parent(struct super_block *sb, struct fid *fid,
 672                 int fh_len, int fh_type)
 673 {
 674         return generic_fh_to_parent(sb, fid, fh_len, fh_type,
 675                                     ext3_nfs_get_inode);
 676 }
 677
 678 /*
 679  * Try to release metadata pages (indirect blocks, directories) which are
 680  * mapped via the block device.  Since these pages could have journal heads
 681  * which would prevent try_to_free_buffers() from freeing them, we must use
 682  * jbd layer's try_to_free_buffers() function to release them.
 683  */
 684 static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
 685                                  gfp_t wait)
 686 {
 687         journal_t *journal = EXT3_SB(sb)->s_journal;
 688
 689         WARN_ON(PageChecked(page));
 690         if (!page_has_buffers(page))
 691                 return 0;
 692         if (journal)
 693                 return journal_try_to_free_buffers(journal, page,
 694                                                    wait & ~__GFP_WAIT);
 695         return try_to_free_buffers(page);
 696 }
 697
 698 #ifdef CONFIG_QUOTA
 699 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
 700 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
 701
 702 static int ext3_write_dquot(struct dquot *dquot);
 703 static int ext3_acquire_dquot(struct dquot *dquot);
 704 static int ext3_release_dquot(struct dquot *dquot);
 705 static int ext3_mark_dquot_dirty(struct dquot *dquot);
 706 static int ext3_write_info(struct super_block *sb, int type);
 707 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
 708                                 char *path, int remount);
 709 static int ext3_quota_on_mount(struct super_block *sb, int type);
 710 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
 711                                size_t len, loff_t off);
 712 static ssize_t ext3_quota_write(struct super_block *sb, int type,
 713                                 const char *data, size_t len, loff_t off);
 714
 715 static struct dquot_operations ext3_quota_operations = {
 716         .initialize     = dquot_initialize,
 717         .drop           = dquot_drop,
 718         .alloc_space    = dquot_alloc_space,
 719         .alloc_inode    = dquot_alloc_inode,
 720         .free_space     = dquot_free_space,
 721         .free_inode     = dquot_free_inode,
 722         .transfer       = dquot_transfer,
 723         .write_dquot    = ext3_write_dquot,
 724         .acquire_dquot  = ext3_acquire_dquot,
 725         .release_dquot  = ext3_release_dquot,
 726         .mark_dirty     = ext3_mark_dquot_dirty,
 727         .write_info     = ext3_write_info,
 728         .alloc_dquot    = dquot_alloc,
 729         .destroy_dquot  = dquot_destroy,
 730 };
 731
 732 static struct quotactl_ops ext3_qctl_operations = {
 733         .quota_on       = ext3_quota_on,
 734         .quota_off      = vfs_quota_off,
 735         .quota_sync     = vfs_quota_sync,
 736         .get_info       = vfs_get_dqinfo,
 737         .set_info       = vfs_set_dqinfo,
 738         .get_dqblk      = vfs_get_dqblk,
 739         .set_dqblk      = vfs_set_dqblk
 740 };
 741 #endif
 742
 743 static const struct super_operations ext3_sops = {
 744         .alloc_inode    = ext3_alloc_inode,
 745         .destroy_inode  = ext3_destroy_inode,
 746         .write_inode    = ext3_write_inode,
 747         .dirty_inode    = ext3_dirty_inode,
 748         .delete_inode   = ext3_delete_inode,
 749         .put_super      = ext3_put_super,
 750         .sync_fs        = ext3_sync_fs,
 751         .freeze_fs      = ext3_freeze,
 752         .unfreeze_fs    = ext3_unfreeze,
 753         .statfs         = ext3_statfs,
 754         .remount_fs     = ext3_remount,
 755         .clear_inode    = ext3_clear_inode,
 756         .show_options   = ext3_show_options,
 757 #ifdef CONFIG_QUOTA
 758         .quota_read     = ext3_quota_read,
 759         .quota_write    = ext3_quota_write,
 760 #endif
 761         .bdev_try_to_free_page = bdev_try_to_free_page,
 762 };
 763
 764 static const struct export_operations ext3_export_ops = {
 765         .fh_to_dentry = ext3_fh_to_dentry,
 766         .fh_to_parent = ext3_fh_to_parent,
 767         .get_parent = ext3_get_parent,
 768 };
 769
 770 enum {
 771         Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
 772         Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
 773         Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
 774         Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
 775         Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
 776         Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
 777         Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
 778         Opt_data_err_abort, Opt_data_err_ignore,
 779         Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
 780         Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
 781         Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
 782         Opt_grpquota
 783 };
 784
 785 static const match_table_t tokens = {
 786         {Opt_bsd_df, "bsddf"},
 787         {Opt_minix_df, "minixdf"},
 788         {Opt_grpid, "grpid"},
 789         {Opt_grpid, "bsdgroups"},
 790         {Opt_nogrpid, "nogrpid"},
 791         {Opt_nogrpid, "sysvgroups"},
 792         {Opt_resgid, "resgid=%u"},
 793         {Opt_resuid, "resuid=%u"},
 794         {Opt_sb, "sb=%u"},
 795         {Opt_err_cont, "errors=continue"},
 796         {Opt_err_panic, "errors=panic"},
 797         {Opt_err_ro, "errors=remount-ro"},
 798         {Opt_nouid32, "nouid32"},
 799         {Opt_nocheck, "nocheck"},
 800         {Opt_nocheck, "check=none"},
 801         {Opt_debug, "debug"},
 802         {Opt_oldalloc, "oldalloc"},
 803         {Opt_orlov, "orlov"},
 804         {Opt_user_xattr, "user_xattr"},
 805         {Opt_nouser_xattr, "nouser_xattr"},
 806         {Opt_acl, "acl"},
 807         {Opt_noacl, "noacl"},
 808         {Opt_reservation, "reservation"},
 809         {Opt_noreservation, "noreservation"},
 810         {Opt_noload, "noload"},
 811         {Opt_nobh, "nobh"},
 812         {Opt_bh, "bh"},
 813         {Opt_commit, "commit=%u"},
 814         {Opt_journal_update, "journal=update"},
 815         {Opt_journal_inum, "journal=%u"},
 816         {Opt_journal_dev, "journal_dev=%u"},
 817         {Opt_abort, "abort"},
 818         {Opt_data_journal, "data=journal"},
 819         {Opt_data_ordered, "data=ordered"},
 820         {Opt_data_writeback, "data=writeback"},
 821         {Opt_data_err_abort, "data_err=abort"},
 822         {Opt_data_err_ignore, "data_err=ignore"},
 823         {Opt_offusrjquota, "usrjquota="},
 824         {Opt_usrjquota, "usrjquota=%s"},
 825         {Opt_offgrpjquota, "grpjquota="},
 826         {Opt_grpjquota, "grpjquota=%s"},
 827         {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
 828         {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
 829         {Opt_grpquota, "grpquota"},
 830         {Opt_noquota, "noquota"},
 831         {Opt_quota, "quota"},
 832         {Opt_usrquota, "usrquota"},
 833         {Opt_barrier, "barrier=%u"},
 834         {Opt_resize, "resize"},
 835         {Opt_err, NULL},
 836 };
 837
 838 static ext3_fsblk_t get_sb_block(void **data)
 839 {
 840         ext3_fsblk_t    sb_block;
 841         char            *options = (char *) *data;
 842
 843         if (!options || strncmp(options, "sb=", 3) != 0)
 844                 return 1;       /* Default location */
 845         options += 3;
 846         /*todo: use simple_strtoll with >32bit ext3 */
 847         sb_block = simple_strtoul(options, &options, 0);
 848         if (*options && *options != ',') {
 849                 printk("EXT3-fs: Invalid sb specification: %s\n",
 850                        (char *) *data);
 851                 return 1;
 852         }
 853         if (*options == ',')
 854                 options++;
 855         *data = (void *) options;
 856         return sb_block;
 857 }
 858
 859 static int parse_options (char *options, struct super_block *sb,
 860                           unsigned int *inum, unsigned long *journal_devnum,
 861                           ext3_fsblk_t *n_blocks_count, int is_remount)
 862 {
 863         struct ext3_sb_info *sbi = EXT3_SB(sb);
 864         char * p;
 865         substring_t args[MAX_OPT_ARGS];
 866         int data_opt = 0;
 867         int option;
 868 #ifdef CONFIG_QUOTA
 869         int qtype, qfmt;
 870         char *qname;
 871 #endif
 872
 873         if (!options)
 874                 return 1;
 875
 876         while ((p = strsep (&options, ",")) != NULL) {
 877                 int token;
 878                 if (!*p)
 879                         continue;
 880
 881                 token = match_token(p, tokens, args);
 882                 switch (token) {
 883                 case Opt_bsd_df:
 884                         clear_opt (sbi->s_mount_opt, MINIX_DF);
 885                         break;
 886                 case Opt_minix_df:
 887                         set_opt (sbi->s_mount_opt, MINIX_DF);
 888                         break;
 889                 case Opt_grpid:
 890                         set_opt (sbi->s_mount_opt, GRPID);
 891                         break;
 892                 case Opt_nogrpid:
 893                         clear_opt (sbi->s_mount_opt, GRPID);
 894                         break;
 895                 case Opt_resuid:
 896                         if (match_int(&args[0], &option))
 897                                 return 0;
 898                         sbi->s_resuid = option;
 899                         break;
 900                 case Opt_resgid:
 901                         if (match_int(&args[0], &option))
 902                                 return 0;
 903                         sbi->s_resgid = option;
 904                         break;
 905                 case Opt_sb:
 906                         /* handled by get_sb_block() instead of here */
 907                         /* *sb_block = match_int(&args[0]); */
 908                         break;
 909                 case Opt_err_panic:
 910                         clear_opt (sbi->s_mount_opt, ERRORS_CONT);
 911                         clear_opt (sbi->s_mount_opt, ERRORS_RO);
 912                         set_opt (sbi->s_mount_opt, ERRORS_PANIC);
 913                         break;
 914                 case Opt_err_ro:
 915                         clear_opt (sbi->s_mount_opt, ERRORS_CONT);
 916                         clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
 917                         set_opt (sbi->s_mount_opt, ERRORS_RO);
 918                         break;
 919                 case Opt_err_cont:
 920                         clear_opt (sbi->s_mount_opt, ERRORS_RO);
 921                         clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
 922                         set_opt (sbi->s_mount_opt, ERRORS_CONT);
 923                         break;
 924                 case Opt_nouid32:
 925                         set_opt (sbi->s_mount_opt, NO_UID32);
 926                         break;
 927                 case Opt_nocheck:
 928                         clear_opt (sbi->s_mount_opt, CHECK);
 929                         break;
 930                 case Opt_debug:
 931                         set_opt (sbi->s_mount_opt, DEBUG);
 932                         break;
 933                 case Opt_oldalloc:
 934                         set_opt (sbi->s_mount_opt, OLDALLOC);
 935                         break;
 936                 case Opt_orlov:
 937                         clear_opt (sbi->s_mount_opt, OLDALLOC);
 938                         break;
 939 #ifdef CONFIG_EXT3_FS_XATTR
 940                 case Opt_user_xattr:
 941                         set_opt (sbi->s_mount_opt, XATTR_USER);
 942                         break;
 943                 case Opt_nouser_xattr:
 944                         clear_opt (sbi->s_mount_opt, XATTR_USER);
 945                         break;
 946 #else
 947                 case Opt_user_xattr:
 948                 case Opt_nouser_xattr:
 949                         printk("EXT3 (no)user_xattr options not supported\n");
 950                         break;
 951 #endif
 952 #ifdef CONFIG_EXT3_FS_POSIX_ACL
 953                 case Opt_acl:
 954                         set_opt(sbi->s_mount_opt, POSIX_ACL);
 955                         break;
 956                 case Opt_noacl:
 957                         clear_opt(sbi->s_mount_opt, POSIX_ACL);
 958                         break;
 959 #else
 960                 case Opt_acl:
 961                 case Opt_noacl:
 962                         printk("EXT3 (no)acl options not supported\n");
 963                         break;
 964 #endif
 965                 case Opt_reservation:
 966                         set_opt(sbi->s_mount_opt, RESERVATION);
 967                         break;
 968                 case Opt_noreservation:
 969                         clear_opt(sbi->s_mount_opt, RESERVATION);
 970                         break;
 971                 case Opt_journal_update:
 972                         /* @@@ FIXME */
 973                         /* Eventually we will want to be able to create
 974                            a journal file here.  For now, only allow the
 975                            user to specify an existing inode to be the
 976                            journal file. */
 977                         if (is_remount) {
 978                                 printk(KERN_ERR "EXT3-fs: cannot specify "
 979                                        "journal on remount\n");
 980                                 return 0;
 981                         }
 982                         set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
 983                         break;
 984                 case Opt_journal_inum:
 985                         if (is_remount) {
 986                                 printk(KERN_ERR "EXT3-fs: cannot specify "
 987                                        "journal on remount\n");
 988                                 return 0;
 989                         }
 990                         if (match_int(&args[0], &option))
 991                                 return 0;
 992                         *inum = option;
 993                         break;
 994                 case Opt_journal_dev:
 995                         if (is_remount) {
 996                                 printk(KERN_ERR "EXT3-fs: cannot specify "
 997                                        "journal on remount\n");
 998                                 return 0;
 999                         }
1000                         if (match_int(&args[0], &option))
1001                                 return 0;
1002                         *journal_devnum = option;
1003                         break;
1004                 case Opt_noload:
1005                         set_opt (sbi->s_mount_opt, NOLOAD);
1006                         break;
1007                 case Opt_commit:
1008                         if (match_int(&args[0], &option))
1009                                 return 0;
1010                         if (option < 0)
1011                                 return 0;
1012                         if (option == 0)
1013                                 option = JBD_DEFAULT_MAX_COMMIT_AGE;
1014                         sbi->s_commit_interval = HZ * option;
1015                         break;
1016                 case Opt_data_journal:
1017                         data_opt = EXT3_MOUNT_JOURNAL_DATA;
1018                         goto datacheck;
1019                 case Opt_data_ordered:
1020                         data_opt = EXT3_MOUNT_ORDERED_DATA;
1021                         goto datacheck;
1022                 case Opt_data_writeback:
1023                         data_opt = EXT3_MOUNT_WRITEBACK_DATA;
1024                 datacheck:
1025                         if (is_remount) {
1026                                 if ((sbi->s_mount_opt & EXT3_MOUNT_DATA_FLAGS)
1027                                                 != data_opt) {
1028                                         printk(KERN_ERR
1029                                                 "EXT3-fs: cannot change data "
1030                                                 "mode on remount\n");
1031                                         return 0;
1032                                 }
1033                         } else {
1034                                 sbi->s_mount_opt &= ~EXT3_MOUNT_DATA_FLAGS;
1035                                 sbi->s_mount_opt |= data_opt;
1036                         }
1037                         break;
1038                 case Opt_data_err_abort:
1039                         set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1040                         break;
1041                 case Opt_data_err_ignore:
1042                         clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1043                         break;
1044 #ifdef CONFIG_QUOTA
1045                 case Opt_usrjquota:
1046                         qtype = USRQUOTA;
1047                         goto set_qf_name;
1048                 case Opt_grpjquota:
1049                         qtype = GRPQUOTA;
1050 set_qf_name:
1051                         if (sb_any_quota_loaded(sb) &&
1052                             !sbi->s_qf_names[qtype]) {
1053                                 printk(KERN_ERR
1054                                         "EXT3-fs: Cannot change journaled "
1055                                         "quota options when quota turned on.\n");
1056                                 return 0;
1057                         }
1058                         qname = match_strdup(&args[0]);
1059                         if (!qname) {
1060                                 printk(KERN_ERR
1061                                         "EXT3-fs: not enough memory for "
1062                                         "storing quotafile name.\n");
1063                                 return 0;
1064                         }
1065                         if (sbi->s_qf_names[qtype] &&
1066                             strcmp(sbi->s_qf_names[qtype], qname)) {
1067                                 printk(KERN_ERR
1068                                         "EXT3-fs: %s quota file already "
1069                                         "specified.\n", QTYPE2NAME(qtype));
1070                                 kfree(qname);
1071                                 return 0;
1072                         }
1073                         sbi->s_qf_names[qtype] = qname;
1074                         if (strchr(sbi->s_qf_names[qtype], '/')) {
1075                                 printk(KERN_ERR
1076                                         "EXT3-fs: quotafile must be on "
1077                                         "filesystem root.\n");
1078                                 kfree(sbi->s_qf_names[qtype]);
1079                                 sbi->s_qf_names[qtype] = NULL;
1080                                 return 0;
1081                         }
1082                         set_opt(sbi->s_mount_opt, QUOTA);
1083                         break;
1084                 case Opt_offusrjquota:
1085                         qtype = USRQUOTA;
1086                         goto clear_qf_name;
1087                 case Opt_offgrpjquota:
1088                         qtype = GRPQUOTA;
1089 clear_qf_name:
1090                         if (sb_any_quota_loaded(sb) &&
1091                             sbi->s_qf_names[qtype]) {
1092                                 printk(KERN_ERR "EXT3-fs: Cannot change "
1093                                         "journaled quota options when "
1094                                         "quota turned on.\n");
1095                                 return 0;
1096                         }
1097                         /*
1098                          * The space will be released later when all options
1099                          * are confirmed to be correct
1100                          */
1101                         sbi->s_qf_names[qtype] = NULL;
1102                         break;
1103                 case Opt_jqfmt_vfsold:
1104                         qfmt = QFMT_VFS_OLD;
1105                         goto set_qf_format;
1106                 case Opt_jqfmt_vfsv0:
1107                         qfmt = QFMT_VFS_V0;
1108 set_qf_format:
1109                         if (sb_any_quota_loaded(sb) &&
1110                             sbi->s_jquota_fmt != qfmt) {
1111                                 printk(KERN_ERR "EXT3-fs: Cannot change "
1112                                         "journaled quota options when "
1113                                         "quota turned on.\n");
1114                                 return 0;
1115                         }
1116                         sbi->s_jquota_fmt = qfmt;
1117                         break;
1118                 case Opt_quota:
1119                 case Opt_usrquota:
1120                         set_opt(sbi->s_mount_opt, QUOTA);
1121                         set_opt(sbi->s_mount_opt, USRQUOTA);
1122                         break;
1123                 case Opt_grpquota:
1124                         set_opt(sbi->s_mount_opt, QUOTA);
1125                         set_opt(sbi->s_mount_opt, GRPQUOTA);
1126                         break;
1127                 case Opt_noquota:
1128                         if (sb_any_quota_loaded(sb)) {
1129                                 printk(KERN_ERR "EXT3-fs: Cannot change quota "
1130                                         "options when quota turned on.\n");
1131                                 return 0;
1132                         }
1133                         clear_opt(sbi->s_mount_opt, QUOTA);
1134                         clear_opt(sbi->s_mount_opt, USRQUOTA);
1135                         clear_opt(sbi->s_mount_opt, GRPQUOTA);
1136                         break;
1137 #else
1138                 case Opt_quota:
1139                 case Opt_usrquota:
1140                 case Opt_grpquota:
1141                         printk(KERN_ERR
1142                                 "EXT3-fs: quota options not supported.\n");
1143                         break;
1144                 case Opt_usrjquota:
1145                 case Opt_grpjquota:
1146                 case Opt_offusrjquota:
1147                 case Opt_offgrpjquota:
1148                 case Opt_jqfmt_vfsold:
1149                 case Opt_jqfmt_vfsv0:
1150                         printk(KERN_ERR
1151                                 "EXT3-fs: journaled quota options not "
1152                                 "supported.\n");
1153                         break;
1154                 case Opt_noquota:
1155                         break;
1156 #endif
1157                 case Opt_abort:
1158                         set_opt(sbi->s_mount_opt, ABORT);
1159                         break;
1160                 case Opt_barrier:
1161                         if (match_int(&args[0], &option))
1162                                 return 0;
1163                         if (option)
1164                                 set_opt(sbi->s_mount_opt, BARRIER);
1165                         else
1166                                 clear_opt(sbi->s_mount_opt, BARRIER);
1167                         break;
1168                 case Opt_ignore:
1169                         break;
1170                 case Opt_resize:
1171                         if (!is_remount) {
1172                                 printk("EXT3-fs: resize option only available "
1173                                         "for remount\n");
1174                                 return 0;
1175                         }
1176                         if (match_int(&args[0], &option) != 0)
1177                                 return 0;
1178                         *n_blocks_count = option;
1179                         break;
1180                 case Opt_nobh:
1181                         set_opt(sbi->s_mount_opt, NOBH);
1182                         break;
1183                 case Opt_bh:
1184                         clear_opt(sbi->s_mount_opt, NOBH);
1185                         break;
1186                 default:
1187                         printk (KERN_ERR
1188                                 "EXT3-fs: Unrecognized mount option \"%s\" "
1189                                 "or missing value\n", p);
1190                         return 0;
1191                 }
1192         }
1193 #ifdef CONFIG_QUOTA
1194         if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1195                 if ((sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA) &&
1196                      sbi->s_qf_names[USRQUOTA])
1197                         clear_opt(sbi->s_mount_opt, USRQUOTA);
1198
1199                 if ((sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA) &&
1200                      sbi->s_qf_names[GRPQUOTA])
1201                         clear_opt(sbi->s_mount_opt, GRPQUOTA);
1202
1203                 if ((sbi->s_qf_names[USRQUOTA] &&
1204                                 (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)) ||
1205                     (sbi->s_qf_names[GRPQUOTA] &&
1206                                 (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA))) {
1207                         printk(KERN_ERR "EXT3-fs: old and new quota "
1208                                         "format mixing.\n");
1209                         return 0;
1210                 }
1211
1212                 if (!sbi->s_jquota_fmt) {
1213                         printk(KERN_ERR "EXT3-fs: journaled quota format "
1214                                         "not specified.\n");
1215                         return 0;
1216                 }
1217         } else {
1218                 if (sbi->s_jquota_fmt) {
1219                         printk(KERN_ERR "EXT3-fs: journaled quota format "
1220                                         "specified with no journaling "
1221                                         "enabled.\n");
1222                         return 0;
1223                 }
1224         }
1225 #endif
1226         return 1;
1227 }
1228
1229 static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1230                             int read_only)
1231 {
1232         struct ext3_sb_info *sbi = EXT3_SB(sb);
1233         int res = 0;
1234
1235         if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
1236                 printk (KERN_ERR "EXT3-fs warning: revision level too high, "
1237                         "forcing read-only mode\n");
1238                 res = MS_RDONLY;
1239         }
1240         if (read_only)
1241                 return res;
1242         if (!(sbi->s_mount_state & EXT3_VALID_FS))
1243                 printk (KERN_WARNING "EXT3-fs warning: mounting unchecked fs, "
1244                         "running e2fsck is recommended\n");
1245         else if ((sbi->s_mount_state & EXT3_ERROR_FS))
1246                 printk (KERN_WARNING
1247                         "EXT3-fs warning: mounting fs with errors, "
1248                         "running e2fsck is recommended\n");
1249         else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1250                  le16_to_cpu(es->s_mnt_count) >=
1251                  (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1252                 printk (KERN_WARNING
1253                         "EXT3-fs warning: maximal mount count reached, "
1254                         "running e2fsck is recommended\n");
1255         else if (le32_to_cpu(es->s_checkinterval) &&
1256                 (le32_to_cpu(es->s_lastcheck) +
1257                         le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1258                 printk (KERN_WARNING
1259                         "EXT3-fs warning: checktime reached, "
1260                         "running e2fsck is recommended\n");
1261 #if 0
1262                 /* @@@ We _will_ want to clear the valid bit if we find
1263                    inconsistencies, to force a fsck at reboot.  But for
1264                    a plain journaled filesystem we can keep it set as
1265                    valid forever! :) */
1266         es->s_state &= cpu_to_le16(~EXT3_VALID_FS);
1267 #endif
1268         if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1269                 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
1270         le16_add_cpu(&es->s_mnt_count, 1);
1271         es->s_mtime = cpu_to_le32(get_seconds());
1272         ext3_update_dynamic_rev(sb);
1273         EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1274
1275         ext3_commit_super(sb, es, 1);
1276         if (test_opt(sb, DEBUG))
1277                 printk(KERN_INFO "[EXT3 FS bs=%lu, gc=%lu, "
1278                                 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1279                         sb->s_blocksize,
1280                         sbi->s_groups_count,
1281                         EXT3_BLOCKS_PER_GROUP(sb),
1282                         EXT3_INODES_PER_GROUP(sb),
1283                         sbi->s_mount_opt);
1284
1285         printk(KERN_INFO "EXT3 FS on %s, ", sb->s_id);
1286         if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1287                 char b[BDEVNAME_SIZE];
1288
1289                 printk("external journal on %s\n",
1290                         bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1291         } else {
1292                 printk("internal journal\n");
1293         }
1294         return res;
1295 }
1296
1297 /* Called at mount-time, super-block is locked */
1298 static int ext3_check_descriptors(struct super_block *sb)
1299 {
1300         struct ext3_sb_info *sbi = EXT3_SB(sb);
1301         int i;
1302
1303         ext3_debug ("Checking group descriptors");
1304
1305         for (i = 0; i < sbi->s_groups_count; i++) {
1306                 struct ext3_group_desc *gdp = ext3_get_group_desc(sb, i, NULL);
1307                 ext3_fsblk_t first_block = ext3_group_first_block_no(sb, i);
1308                 ext3_fsblk_t last_block;
1309
1310                 if (i == sbi->s_groups_count - 1)
1311                         last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
1312                 else
1313                         last_block = first_block +
1314                                 (EXT3_BLOCKS_PER_GROUP(sb) - 1);
1315
1316                 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
1317                     le32_to_cpu(gdp->bg_block_bitmap) > last_block)
1318                 {
1319                         ext3_error (sb, "ext3_check_descriptors",
1320                                     "Block bitmap for group %d"
1321                                     " not in group (block %lu)!",
1322                                     i, (unsigned long)
1323                                         le32_to_cpu(gdp->bg_block_bitmap));
1324                         return 0;
1325                 }
1326                 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
1327                     le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
1328                 {
1329                         ext3_error (sb, "ext3_check_descriptors",
1330                                     "Inode bitmap for group %d"
1331                                     " not in group (block %lu)!",
1332                                     i, (unsigned long)
1333                                         le32_to_cpu(gdp->bg_inode_bitmap));
1334                         return 0;
1335                 }
1336                 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
1337                     le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
1338                     last_block)
1339                 {
1340                         ext3_error (sb, "ext3_check_descriptors",
1341                                     "Inode table for group %d"
1342                                     " not in group (block %lu)!",
1343                                     i, (unsigned long)
1344                                         le32_to_cpu(gdp->bg_inode_table));
1345                         return 0;
1346                 }
1347         }
1348
1349         sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1350         sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1351         return 1;
1352 }
1353
1354
1355 /* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1356  * the superblock) which were deleted from all directories, but held open by
1357  * a process at the time of a crash.  We walk the list and try to delete these
1358  * inodes at recovery time (only with a read-write filesystem).
1359  *
1360  * In order to keep the orphan inode chain consistent during traversal (in
1361  * case of crash during recovery), we link each inode into the superblock
1362  * orphan list_head and handle it the same way as an inode deletion during
1363  * normal operation (which journals the operations for us).
1364  *
1365  * We only do an iget() and an iput() on each inode, which is very safe if we
1366  * accidentally point at an in-use or already deleted inode.  The worst that
1367  * can happen in this case is that we get a "bit already cleared" message from
1368  * ext3_free_inode().  The only reason we would point at a wrong inode is if
1369  * e2fsck was run on this filesystem, and it must have already done the orphan
1370  * inode cleanup for us, so we can safely abort without any further action.
1371  */
1372 static void ext3_orphan_cleanup (struct super_block * sb,
1373                                  struct ext3_super_block * es)
1374 {
1375         unsigned int s_flags = sb->s_flags;
1376         int nr_orphans = 0, nr_truncates = 0;
1377 #ifdef CONFIG_QUOTA
1378         int i;
1379 #endif
1380         if (!es->s_last_orphan) {
1381                 jbd_debug(4, "no orphan inodes to clean up\n");
1382                 return;
1383         }
1384
1385         if (bdev_read_only(sb->s_bdev)) {
1386                 printk(KERN_ERR "EXT3-fs: write access "
1387                         "unavailable, skipping orphan cleanup.\n");
1388                 return;
1389         }
1390
1391         if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1392                 if (es->s_last_orphan)
1393                         jbd_debug(1, "Errors on filesystem, "
1394                                   "clearing orphan list.\n");
1395                 es->s_last_orphan = 0;
1396                 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1397                 return;
1398         }
1399
1400         if (s_flags & MS_RDONLY) {
1401                 printk(KERN_INFO "EXT3-fs: %s: orphan cleanup on readonly fs\n",
1402                        sb->s_id);
1403                 sb->s_flags &= ~MS_RDONLY;
1404         }
1405 #ifdef CONFIG_QUOTA
1406         /* Needed for iput() to work correctly and not trash data */
1407         sb->s_flags |= MS_ACTIVE;
1408         /* Turn on quotas so that they are updated correctly */
1409         for (i = 0; i < MAXQUOTAS; i++) {
1410                 if (EXT3_SB(sb)->s_qf_names[i]) {
1411                         int ret = ext3_quota_on_mount(sb, i);
1412                         if (ret < 0)
1413                                 printk(KERN_ERR
1414                                         "EXT3-fs: Cannot turn on journaled "
1415                                         "quota: error %d\n", ret);
1416                 }
1417         }
1418 #endif
1419
1420         while (es->s_last_orphan) {
1421                 struct inode *inode;
1422
1423                 inode = ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1424                 if (IS_ERR(inode)) {
1425                         es->s_last_orphan = 0;
1426                         break;
1427                 }
1428
1429                 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1430                 vfs_dq_init(inode);
1431                 if (inode->i_nlink) {
1432                         printk(KERN_DEBUG
1433                                 "%s: truncating inode %lu to %Ld bytes\n",
1434                                 __func__, inode->i_ino, inode->i_size);
1435                         jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1436                                   inode->i_ino, inode->i_size);
1437                         ext3_truncate(inode);
1438                         nr_truncates++;
1439                 } else {
1440                         printk(KERN_DEBUG
1441                                 "%s: deleting unreferenced inode %lu\n",
1442                                 __func__, inode->i_ino);
1443                         jbd_debug(2, "deleting unreferenced inode %lu\n",
1444                                   inode->i_ino);
1445                         nr_orphans++;
1446                 }
1447                 iput(inode);  /* The delete magic happens here! */
1448         }
1449
1450 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1451
1452         if (nr_orphans)
1453                 printk(KERN_INFO "EXT3-fs: %s: %d orphan inode%s deleted\n",
1454                        sb->s_id, PLURAL(nr_orphans));
1455         if (nr_truncates)
1456                 printk(KERN_INFO "EXT3-fs: %s: %d truncate%s cleaned up\n",
1457                        sb->s_id, PLURAL(nr_truncates));
1458 #ifdef CONFIG_QUOTA
1459         /* Turn quotas off */
1460         for (i = 0; i < MAXQUOTAS; i++) {
1461                 if (sb_dqopt(sb)->files[i])
1462                         vfs_quota_off(sb, i, 0);
1463         }
1464 #endif
1465         sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1466 }
1467
1468 /*
1469  * Maximal file size.  There is a direct, and {,double-,triple-}indirect
1470  * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1471  * We need to be 1 filesystem block less than the 2^32 sector limit.
1472  */
1473 static loff_t ext3_max_size(int bits)
1474 {
1475         loff_t res = EXT3_NDIR_BLOCKS;
1476         int meta_blocks;
1477         loff_t upper_limit;
1478
1479         /* This is calculated to be the largest file size for a
1480          * dense, file such that the total number of
1481          * sectors in the file, including data and all indirect blocks,
1482          * does not exceed 2^32 -1
1483          * __u32 i_blocks representing the total number of
1484          * 512 bytes blocks of the file
1485          */
1486         upper_limit = (1LL << 32) - 1;
1487
1488         /* total blocks in file system block size */
1489         upper_limit >>= (bits - 9);
1490
1491
1492         /* indirect blocks */
1493         meta_blocks = 1;
1494         /* double indirect blocks */
1495         meta_blocks += 1 + (1LL << (bits-2));
1496         /* tripple indirect blocks */
1497         meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1498
1499         upper_limit -= meta_blocks;
1500         upper_limit <<= bits;
1501
1502         res += 1LL << (bits-2);
1503         res += 1LL << (2*(bits-2));
1504         res += 1LL << (3*(bits-2));
1505         res <<= bits;
1506         if (res > upper_limit)
1507                 res = upper_limit;
1508
1509         if (res > MAX_LFS_FILESIZE)
1510                 res = MAX_LFS_FILESIZE;
1511
1512         return res;
1513 }
1514
1515 static ext3_fsblk_t descriptor_loc(struct super_block *sb,
1516                                     ext3_fsblk_t logic_sb_block,
1517                                     int nr)
1518 {
1519         struct ext3_sb_info *sbi = EXT3_SB(sb);
1520         unsigned long bg, first_meta_bg;
1521         int has_super = 0;
1522
1523         first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1524
1525         if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1526             nr < first_meta_bg)
1527                 return (logic_sb_block + nr + 1);
1528         bg = sbi->s_desc_per_block * nr;
1529         if (ext3_bg_has_super(sb, bg))
1530                 has_super = 1;
1531         return (has_super + ext3_group_first_block_no(sb, bg));
1532 }
1533
1534
1535 static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1536 {
1537         struct buffer_head * bh;
1538         struct ext3_super_block *es = NULL;
1539         struct ext3_sb_info *sbi;
1540         ext3_fsblk_t block;
1541         ext3_fsblk_t sb_block = get_sb_block(&data);
1542         ext3_fsblk_t logic_sb_block;
1543         unsigned long offset = 0;
1544         unsigned int journal_inum = 0;
1545         unsigned long journal_devnum = 0;
1546         unsigned long def_mount_opts;
1547         struct inode *root;
1548         int blocksize;
1549         int hblock;
1550         int db_count;
1551         int i;
1552         int needs_recovery;
1553         int ret = -EINVAL;
1554         __le32 features;
1555         int err;
1556
1557         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1558         if (!sbi)
1559                 return -ENOMEM;
1560
1561         sbi->s_blockgroup_lock =
1562                 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
1563         if (!sbi->s_blockgroup_lock) {
1564                 kfree(sbi);
1565                 return -ENOMEM;
1566         }
1567         sb->s_fs_info = sbi;
1568         sbi->s_mount_opt = 0;
1569         sbi->s_resuid = EXT3_DEF_RESUID;
1570         sbi->s_resgid = EXT3_DEF_RESGID;
1571         sbi->s_sb_block = sb_block;
1572
1573         unlock_kernel();
1574
1575         blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1576         if (!blocksize) {
1577                 printk(KERN_ERR "EXT3-fs: unable to set blocksize\n");
1578                 goto out_fail;
1579         }
1580
1581         /*
1582          * The ext3 superblock will not be buffer aligned for other than 1kB
1583          * block sizes.  We need to calculate the offset from buffer start.
1584          */
1585         if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1586                 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1587                 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1588         } else {
1589                 logic_sb_block = sb_block;
1590         }
1591
1592         if (!(bh = sb_bread(sb, logic_sb_block))) {
1593                 printk (KERN_ERR "EXT3-fs: unable to read superblock\n");
1594                 goto out_fail;
1595         }
1596         /*
1597          * Note: s_es must be initialized as soon as possible because
1598          *       some ext3 macro-instructions depend on its value
1599          */
1600         es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1601         sbi->s_es = es;
1602         sb->s_magic = le16_to_cpu(es->s_magic);
1603         if (sb->s_magic != EXT3_SUPER_MAGIC)
1604                 goto cantfind_ext3;
1605
1606         /* Set defaults before we parse the mount options */
1607         def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1608         if (def_mount_opts & EXT3_DEFM_DEBUG)
1609                 set_opt(sbi->s_mount_opt, DEBUG);
1610         if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1611                 set_opt(sbi->s_mount_opt, GRPID);
1612         if (def_mount_opts & EXT3_DEFM_UID16)
1613                 set_opt(sbi->s_mount_opt, NO_UID32);
1614 #ifdef CONFIG_EXT3_FS_XATTR
1615         if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1616                 set_opt(sbi->s_mount_opt, XATTR_USER);
1617 #endif
1618 #ifdef CONFIG_EXT3_FS_POSIX_ACL
1619         if (def_mount_opts & EXT3_DEFM_ACL)
1620                 set_opt(sbi->s_mount_opt, POSIX_ACL);
1621 #endif
1622         if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1623                 sbi->s_mount_opt |= EXT3_MOUNT_JOURNAL_DATA;
1624         else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1625                 sbi->s_mount_opt |= EXT3_MOUNT_ORDERED_DATA;
1626         else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1627                 sbi->s_mount_opt |= EXT3_MOUNT_WRITEBACK_DATA;
1628
1629         if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1630                 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1631         else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_CONTINUE)
1632                 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1633         else
1634                 set_opt(sbi->s_mount_opt, ERRORS_RO);
1635
1636         sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1637         sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1638
1639         set_opt(sbi->s_mount_opt, RESERVATION);
1640
1641         if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1642                             NULL, 0))
1643                 goto failed_mount;
1644
1645         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1646                 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1647
1648         if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1649             (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1650              EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1651              EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1652                 printk(KERN_WARNING
1653                        "EXT3-fs warning: feature flags set on rev 0 fs, "
1654                        "running e2fsck is recommended\n");
1655         /*
1656          * Check feature flags regardless of the revision level, since we
1657          * previously didn't change the revision level when setting the flags,
1658          * so there is a chance incompat flags are set on a rev 0 filesystem.
1659          */
1660         features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1661         if (features) {
1662                 printk(KERN_ERR "EXT3-fs: %s: couldn't mount because of "
1663                        "unsupported optional features (%x).\n",
1664                        sb->s_id, le32_to_cpu(features));
1665                 goto failed_mount;
1666         }
1667         features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1668         if (!(sb->s_flags & MS_RDONLY) && features) {
1669                 printk(KERN_ERR "EXT3-fs: %s: couldn't mount RDWR because of "
1670                        "unsupported optional features (%x).\n",
1671                        sb->s_id, le32_to_cpu(features));
1672                 goto failed_mount;
1673         }
1674         blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1675
1676         if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1677             blocksize > EXT3_MAX_BLOCK_SIZE) {
1678                 printk(KERN_ERR
1679                        "EXT3-fs: Unsupported filesystem blocksize %d on %s.\n",
1680                        blocksize, sb->s_id);
1681                 goto failed_mount;
1682         }
1683
1684         hblock = bdev_logical_block_size(sb->s_bdev);
1685         if (sb->s_blocksize != blocksize) {
1686                 /*
1687                  * Make sure the blocksize for the filesystem is larger
1688                  * than the hardware sectorsize for the machine.
1689                  */
1690                 if (blocksize < hblock) {
1691                         printk(KERN_ERR "EXT3-fs: blocksize %d too small for "
1692                                "device blocksize %d.\n", blocksize, hblock);
1693                         goto failed_mount;
1694                 }
1695
1696                 brelse (bh);
1697                 if (!sb_set_blocksize(sb, blocksize)) {
1698                         printk(KERN_ERR "EXT3-fs: bad blocksize %d.\n",
1699                                 blocksize);
1700                         goto out_fail;
1701                 }
1702                 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1703                 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1704                 bh = sb_bread(sb, logic_sb_block);
1705                 if (!bh) {
1706                         printk(KERN_ERR
1707                                "EXT3-fs: Can't read superblock on 2nd try.\n");
1708                         goto failed_mount;
1709                 }
1710                 es = (struct ext3_super_block *)(((char *)bh->b_data) + offset);
1711                 sbi->s_es = es;
1712                 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
1713                         printk (KERN_ERR
1714                                 "EXT3-fs: Magic mismatch, very weird !\n");
1715                         goto failed_mount;
1716                 }
1717         }
1718
1719         sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1720
1721         if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1722                 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1723                 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1724         } else {
1725                 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1726                 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1727                 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
1728                     (!is_power_of_2(sbi->s_inode_size)) ||
1729                     (sbi->s_inode_size > blocksize)) {
1730                         printk (KERN_ERR
1731                                 "EXT3-fs: unsupported inode size: %d\n",
1732                                 sbi->s_inode_size);
1733                         goto failed_mount;
1734                 }
1735         }
1736         sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1737                                    le32_to_cpu(es->s_log_frag_size);
1738         if (blocksize != sbi->s_frag_size) {
1739                 printk(KERN_ERR
1740                        "EXT3-fs: fragsize %lu != blocksize %u (unsupported)\n",
1741                        sbi->s_frag_size, blocksize);
1742                 goto failed_mount;
1743         }
1744         sbi->s_frags_per_block = 1;
1745         sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1746         sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1747         sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1748         if (EXT3_INODE_SIZE(sb) == 0 || EXT3_INODES_PER_GROUP(sb) == 0)
1749                 goto cantfind_ext3;
1750         sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1751         if (sbi->s_inodes_per_block == 0)
1752                 goto cantfind_ext3;
1753         sbi->s_itb_per_group = sbi->s_inodes_per_group /
1754                                         sbi->s_inodes_per_block;
1755         sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1756         sbi->s_sbh = bh;
1757         sbi->s_mount_state = le16_to_cpu(es->s_state);
1758         sbi->s_addr_per_block_bits = ilog2(EXT3_ADDR_PER_BLOCK(sb));
1759         sbi->s_desc_per_block_bits = ilog2(EXT3_DESC_PER_BLOCK(sb));
1760         for (i=0; i < 4; i++)
1761                 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1762         sbi->s_def_hash_version = es->s_def_hash_version;
1763         i = le32_to_cpu(es->s_flags);
1764         if (i & EXT2_FLAGS_UNSIGNED_HASH)
1765                 sbi->s_hash_unsigned = 3;
1766         else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
1767 #ifdef __CHAR_UNSIGNED__
1768                 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
1769                 sbi->s_hash_unsigned = 3;
1770 #else
1771                 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
1772 #endif
1773         }
1774
1775         if (sbi->s_blocks_per_group > blocksize * 8) {
1776                 printk (KERN_ERR
1777                         "EXT3-fs: #blocks per group too big: %lu\n",
1778                         sbi->s_blocks_per_group);
1779                 goto failed_mount;
1780         }
1781         if (sbi->s_frags_per_group > blocksize * 8) {
1782                 printk (KERN_ERR
1783                         "EXT3-fs: #fragments per group too big: %lu\n",
1784                         sbi->s_frags_per_group);
1785                 goto failed_mount;
1786         }
1787         if (sbi->s_inodes_per_group > blocksize * 8) {
1788                 printk (KERN_ERR
1789                         "EXT3-fs: #inodes per group too big: %lu\n",
1790                         sbi->s_inodes_per_group);
1791                 goto failed_mount;
1792         }
1793
1794         if (le32_to_cpu(es->s_blocks_count) >
1795                     (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
1796                 printk(KERN_ERR "EXT3-fs: filesystem on %s:"
1797                         " too large to mount safely\n", sb->s_id);
1798                 if (sizeof(sector_t) < 8)
1799                         printk(KERN_WARNING "EXT3-fs: CONFIG_LBDAF not "
1800                                         "enabled\n");
1801                 goto failed_mount;
1802         }
1803
1804         if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1805                 goto cantfind_ext3;
1806         sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1807                                le32_to_cpu(es->s_first_data_block) - 1)
1808                                        / EXT3_BLOCKS_PER_GROUP(sb)) + 1;
1809         db_count = (sbi->s_groups_count + EXT3_DESC_PER_BLOCK(sb) - 1) /
1810                    EXT3_DESC_PER_BLOCK(sb);
1811         sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1812                                     GFP_KERNEL);
1813         if (sbi->s_group_desc == NULL) {
1814                 printk (KERN_ERR "EXT3-fs: not enough memory\n");
1815                 goto failed_mount;
1816         }
1817
1818         bgl_lock_init(sbi->s_blockgroup_lock);
1819
1820         for (i = 0; i < db_count; i++) {
1821                 block = descriptor_loc(sb, logic_sb_block, i);
1822                 sbi->s_group_desc[i] = sb_bread(sb, block);
1823                 if (!sbi->s_group_desc[i]) {
1824                         printk (KERN_ERR "EXT3-fs: "
1825                                 "can't read group descriptor %d\n", i);
1826                         db_count = i;
1827                         goto failed_mount2;
1828                 }
1829         }
1830         if (!ext3_check_descriptors (sb)) {
1831                 printk(KERN_ERR "EXT3-fs: group descriptors corrupted!\n");
1832                 goto failed_mount2;
1833         }
1834         sbi->s_gdb_count = db_count;
1835         get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1836         spin_lock_init(&sbi->s_next_gen_lock);
1837
1838         err = percpu_counter_init(&sbi->s_freeblocks_counter,
1839                         ext3_count_free_blocks(sb));
1840         if (!err) {
1841                 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1842                                 ext3_count_free_inodes(sb));
1843         }
1844         if (!err) {
1845                 err = percpu_counter_init(&sbi->s_dirs_counter,
1846                                 ext3_count_dirs(sb));
1847         }
1848         if (err) {
1849                 printk(KERN_ERR "EXT3-fs: insufficient memory\n");
1850                 goto failed_mount3;
1851         }
1852
1853         /* per fileystem reservation list head & lock */
1854         spin_lock_init(&sbi->s_rsv_window_lock);
1855         sbi->s_rsv_window_root = RB_ROOT;
1856         /* Add a single, static dummy reservation to the start of the
1857          * reservation window list --- it gives us a placeholder for
1858          * append-at-start-of-list which makes the allocation logic
1859          * _much_ simpler. */
1860         sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1861         sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1862         sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1863         sbi->s_rsv_window_head.rsv_goal_size = 0;
1864         ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1865
1866         /*
1867          * set up enough so that it can read an inode
1868          */
1869         sb->s_op = &ext3_sops;
1870         sb->s_export_op = &ext3_export_ops;
1871         sb->s_xattr = ext3_xattr_handlers;
1872 #ifdef CONFIG_QUOTA
1873         sb->s_qcop = &ext3_qctl_operations;
1874         sb->dq_op = &ext3_quota_operations;
1875 #endif
1876         INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1877
1878         sb->s_root = NULL;
1879
1880         needs_recovery = (es->s_last_orphan != 0 ||
1881                           EXT3_HAS_INCOMPAT_FEATURE(sb,
1882                                     EXT3_FEATURE_INCOMPAT_RECOVER));
1883
1884         /*
1885          * The first inode we look at is the journal inode.  Don't try
1886          * root first: it may be modified in the journal!
1887          */
1888         if (!test_opt(sb, NOLOAD) &&
1889             EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
1890                 if (ext3_load_journal(sb, es, journal_devnum))
1891                         goto failed_mount3;
1892         } else if (journal_inum) {
1893                 if (ext3_create_journal(sb, es, journal_inum))
1894                         goto failed_mount3;
1895         } else {
1896                 if (!silent)
1897                         printk (KERN_ERR
1898                                 "ext3: No journal on filesystem on %s\n",
1899                                 sb->s_id);
1900                 goto failed_mount3;
1901         }
1902
1903         /* We have now updated the journal if required, so we can
1904          * validate the data journaling mode. */
1905         switch (test_opt(sb, DATA_FLAGS)) {
1906         case 0:
1907                 /* No mode set, assume a default based on the journal
1908                    capabilities: ORDERED_DATA if the journal can
1909                    cope, else JOURNAL_DATA */
1910                 if (journal_check_available_features
1911                     (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
1912                         set_opt(sbi->s_mount_opt, DEFAULT_DATA_MODE);
1913                 else
1914                         set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1915                 break;
1916
1917         case EXT3_MOUNT_ORDERED_DATA:
1918         case EXT3_MOUNT_WRITEBACK_DATA:
1919                 if (!journal_check_available_features
1920                     (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
1921                         printk(KERN_ERR "EXT3-fs: Journal does not support "
1922                                "requested data journaling mode\n");
1923                         goto failed_mount4;
1924                 }
1925         default:
1926                 break;
1927         }
1928
1929         if (test_opt(sb, NOBH)) {
1930                 if (!(test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)) {
1931                         printk(KERN_WARNING "EXT3-fs: Ignoring nobh option - "
1932                                 "its supported only with writeback mode\n");
1933                         clear_opt(sbi->s_mount_opt, NOBH);
1934                 }
1935         }
1936         /*
1937          * The journal_load will have done any necessary log recovery,
1938          * so we can safely mount the rest of the filesystem now.
1939          */
1940
1941         root = ext3_iget(sb, EXT3_ROOT_INO);
1942         if (IS_ERR(root)) {
1943                 printk(KERN_ERR "EXT3-fs: get root inode failed\n");
1944                 ret = PTR_ERR(root);
1945                 goto failed_mount4;
1946         }
1947         if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1948                 iput(root);
1949                 printk(KERN_ERR "EXT3-fs: corrupt root inode, run e2fsck\n");
1950                 goto failed_mount4;
1951         }
1952         sb->s_root = d_alloc_root(root);
1953         if (!sb->s_root) {
1954                 printk(KERN_ERR "EXT3-fs: get root dentry failed\n");
1955                 iput(root);
1956                 ret = -ENOMEM;
1957                 goto failed_mount4;
1958         }
1959
1960         ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
1961         /*
1962          * akpm: core read_super() calls in here with the superblock locked.
1963          * That deadlocks, because orphan cleanup needs to lock the superblock
1964          * in numerous places.  Here we just pop the lock - it's relatively
1965          * harmless, because we are now ready to accept write_super() requests,
1966          * and aviro says that's the only reason for hanging onto the
1967          * superblock lock.
1968          */
1969         EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
1970         ext3_orphan_cleanup(sb, es);
1971         EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
1972         if (needs_recovery)
1973                 printk (KERN_INFO "EXT3-fs: recovery complete.\n");
1974         ext3_mark_recovery_complete(sb, es);
1975         printk (KERN_INFO "EXT3-fs: mounted filesystem with %s data mode.\n",
1976                 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
1977                 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
1978                 "writeback");
1979
1980         lock_kernel();
1981         return 0;
1982
1983 cantfind_ext3:
1984         if (!silent)
1985                 printk(KERN_ERR "VFS: Can't find ext3 filesystem on dev %s.\n",
1986                        sb->s_id);
1987         goto failed_mount;
1988
1989 failed_mount4:
1990         journal_destroy(sbi->s_journal);
1991 failed_mount3:
1992         percpu_counter_destroy(&sbi->s_freeblocks_counter);
1993         percpu_counter_destroy(&sbi->s_freeinodes_counter);
1994         percpu_counter_destroy(&sbi->s_dirs_counter);
1995 failed_mount2:
1996         for (i = 0; i < db_count; i++)
1997                 brelse(sbi->s_group_desc[i]);
1998         kfree(sbi->s_group_desc);
1999 failed_mount:
2000 #ifdef CONFIG_QUOTA
2001         for (i = 0; i < MAXQUOTAS; i++)
2002                 kfree(sbi->s_qf_names[i]);
2003 #endif
2004         ext3_blkdev_remove(sbi);
2005         brelse(bh);
2006 out_fail:
2007         sb->s_fs_info = NULL;
2008         kfree(sbi->s_blockgroup_lock);
2009         kfree(sbi);
2010         lock_kernel();
2011         return ret;
2012 }
2013
2014 /*
2015  * Setup any per-fs journal parameters now.  We'll do this both on
2016  * initial mount, once the journal has been initialised but before we've
2017  * done any recovery; and again on any subsequent remount.
2018  */
2019 static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
2020 {
2021         struct ext3_sb_info *sbi = EXT3_SB(sb);
2022
2023         if (sbi->s_commit_interval)
2024                 journal->j_commit_interval = sbi->s_commit_interval;
2025         /* We could also set up an ext3-specific default for the commit
2026          * interval here, but for now we'll just fall back to the jbd
2027          * default. */
2028
2029         spin_lock(&journal->j_state_lock);
2030         if (test_opt(sb, BARRIER))
2031                 journal->j_flags |= JFS_BARRIER;
2032         else
2033                 journal->j_flags &= ~JFS_BARRIER;
2034         if (test_opt(sb, DATA_ERR_ABORT))
2035                 journal->j_flags |= JFS_ABORT_ON_SYNCDATA_ERR;
2036         else
2037                 journal->j_flags &= ~JFS_ABORT_ON_SYNCDATA_ERR;
2038         spin_unlock(&journal->j_state_lock);
2039 }
2040
2041 static journal_t *ext3_get_journal(struct super_block *sb,
2042                                    unsigned int journal_inum)
2043 {
2044         struct inode *journal_inode;
2045         journal_t *journal;
2046
2047         /* First, test for the existence of a valid inode on disk.  Bad
2048          * things happen if we iget() an unused inode, as the subsequent
2049          * iput() will try to delete it. */
2050
2051         journal_inode = ext3_iget(sb, journal_inum);
2052         if (IS_ERR(journal_inode)) {
2053                 printk(KERN_ERR "EXT3-fs: no journal found.\n");
2054                 return NULL;
2055         }
2056         if (!journal_inode->i_nlink) {
2057                 make_bad_inode(journal_inode);
2058                 iput(journal_inode);
2059                 printk(KERN_ERR "EXT3-fs: journal inode is deleted.\n");
2060                 return NULL;
2061         }
2062
2063         jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2064                   journal_inode, journal_inode->i_size);
2065         if (!S_ISREG(journal_inode->i_mode)) {
2066                 printk(KERN_ERR "EXT3-fs: invalid journal inode.\n");
2067                 iput(journal_inode);
2068                 return NULL;
2069         }
2070
2071         journal = journal_init_inode(journal_inode);
2072         if (!journal) {
2073                 printk(KERN_ERR "EXT3-fs: Could not load journal inode\n");
2074                 iput(journal_inode);
2075                 return NULL;
2076         }
2077         journal->j_private = sb;
2078         ext3_init_journal_params(sb, journal);
2079         return journal;
2080 }
2081
2082 static journal_t *ext3_get_dev_journal(struct super_block *sb,
2083                                        dev_t j_dev)
2084 {
2085         struct buffer_head * bh;
2086         journal_t *journal;
2087         ext3_fsblk_t start;
2088         ext3_fsblk_t len;
2089         int hblock, blocksize;
2090         ext3_fsblk_t sb_block;
2091         unsigned long offset;
2092         struct ext3_super_block * es;
2093         struct block_device *bdev;
2094
2095         bdev = ext3_blkdev_get(j_dev);
2096         if (bdev == NULL)
2097                 return NULL;
2098
2099         if (bd_claim(bdev, sb)) {
2100                 printk(KERN_ERR
2101                         "EXT3: failed to claim external journal device.\n");
2102                 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
2103                 return NULL;
2104         }
2105
2106         blocksize = sb->s_blocksize;
2107         hblock = bdev_logical_block_size(bdev);
2108         if (blocksize < hblock) {
2109                 printk(KERN_ERR
2110                         "EXT3-fs: blocksize too small for journal device.\n");
2111                 goto out_bdev;
2112         }
2113
2114         sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
2115         offset = EXT3_MIN_BLOCK_SIZE % blocksize;
2116         set_blocksize(bdev, blocksize);
2117         if (!(bh = __bread(bdev, sb_block, blocksize))) {
2118                 printk(KERN_ERR "EXT3-fs: couldn't read superblock of "
2119                        "external journal\n");
2120                 goto out_bdev;
2121         }
2122
2123         es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
2124         if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
2125             !(le32_to_cpu(es->s_feature_incompat) &
2126               EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2127                 printk(KERN_ERR "EXT3-fs: external journal has "
2128                                         "bad superblock\n");
2129                 brelse(bh);
2130                 goto out_bdev;
2131         }
2132
2133         if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2134                 printk(KERN_ERR "EXT3-fs: journal UUID does not match\n");
2135                 brelse(bh);
2136                 goto out_bdev;
2137         }
2138
2139         len = le32_to_cpu(es->s_blocks_count);
2140         start = sb_block + 1;
2141         brelse(bh);     /* we're done with the superblock */
2142
2143         journal = journal_init_dev(bdev, sb->s_bdev,
2144                                         start, len, blocksize);
2145         if (!journal) {
2146                 printk(KERN_ERR "EXT3-fs: failed to create device journal\n");
2147                 goto out_bdev;
2148         }
2149         journal->j_private = sb;
2150         ll_rw_block(READ, 1, &journal->j_sb_buffer);
2151         wait_on_buffer(journal->j_sb_buffer);
2152         if (!buffer_uptodate(journal->j_sb_buffer)) {
2153                 printk(KERN_ERR "EXT3-fs: I/O error on journal device\n");
2154                 goto out_journal;
2155         }
2156         if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
2157                 printk(KERN_ERR "EXT3-fs: External journal has more than one "
2158                                         "user (unsupported) - %d\n",
2159                         be32_to_cpu(journal->j_superblock->s_nr_users));
2160                 goto out_journal;
2161         }
2162         EXT3_SB(sb)->journal_bdev = bdev;
2163         ext3_init_journal_params(sb, journal);
2164         return journal;
2165 out_journal:
2166         journal_destroy(journal);
2167 out_bdev:
2168         ext3_blkdev_put(bdev);
2169         return NULL;
2170 }
2171
2172 static int ext3_load_journal(struct super_block *sb,
2173                              struct ext3_super_block *es,
2174                              unsigned long journal_devnum)
2175 {
2176         journal_t *journal;
2177         unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2178         dev_t journal_dev;
2179         int err = 0;
2180         int really_read_only;
2181
2182         if (journal_devnum &&
2183             journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2184                 printk(KERN_INFO "EXT3-fs: external journal device major/minor "
2185                         "numbers have changed\n");
2186                 journal_dev = new_decode_dev(journal_devnum);
2187         } else
2188                 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2189
2190         really_read_only = bdev_read_only(sb->s_bdev);
2191
2192         /*
2193          * Are we loading a blank journal or performing recovery after a
2194          * crash?  For recovery, we need to check in advance whether we
2195          * can get read-write access to the device.
2196          */
2197
2198         if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
2199                 if (sb->s_flags & MS_RDONLY) {
2200                         printk(KERN_INFO "EXT3-fs: INFO: recovery "
2201                                         "required on readonly filesystem.\n");
2202                         if (really_read_only) {
2203                                 printk(KERN_ERR "EXT3-fs: write access "
2204                                         "unavailable, cannot proceed.\n");
2205                                 return -EROFS;
2206                         }
2207                         printk (KERN_INFO "EXT3-fs: write access will "
2208                                         "be enabled during recovery.\n");
2209                 }
2210         }
2211
2212         if (journal_inum && journal_dev) {
2213                 printk(KERN_ERR "EXT3-fs: filesystem has both journal "
2214                        "and inode journals!\n");
2215                 return -EINVAL;
2216         }
2217
2218         if (journal_inum) {
2219                 if (!(journal = ext3_get_journal(sb, journal_inum)))
2220                         return -EINVAL;
2221         } else {
2222                 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
2223                         return -EINVAL;
2224         }
2225
2226         if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2227                 err = journal_update_format(journal);
2228                 if (err)  {
2229                         printk(KERN_ERR "EXT3-fs: error updating journal.\n");
2230                         journal_destroy(journal);
2231                         return err;
2232                 }
2233         }
2234
2235         if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
2236                 err = journal_wipe(journal, !really_read_only);
2237         if (!err)
2238                 err = journal_load(journal);
2239
2240         if (err) {
2241                 printk(KERN_ERR "EXT3-fs: error loading journal.\n");
2242                 journal_destroy(journal);
2243                 return err;
2244         }
2245
2246         EXT3_SB(sb)->s_journal = journal;
2247         ext3_clear_journal_err(sb, es);
2248
2249         if (journal_devnum &&
2250             journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2251                 es->s_journal_dev = cpu_to_le32(journal_devnum);
2252
2253                 /* Make sure we flush the recovery flag to disk. */
2254                 ext3_commit_super(sb, es, 1);
2255         }
2256
2257         return 0;
2258 }
2259
2260 static int ext3_create_journal(struct super_block * sb,
2261                                struct ext3_super_block * es,
2262                                unsigned int journal_inum)
2263 {
2264         journal_t *journal;
2265         int err;
2266
2267         if (sb->s_flags & MS_RDONLY) {
2268                 printk(KERN_ERR "EXT3-fs: readonly filesystem when trying to "
2269                                 "create journal.\n");
2270                 return -EROFS;
2271         }
2272
2273         journal = ext3_get_journal(sb, journal_inum);
2274         if (!journal)
2275                 return -EINVAL;
2276
2277         printk(KERN_INFO "EXT3-fs: creating new journal on inode %u\n",
2278                journal_inum);
2279
2280         err = journal_create(journal);
2281         if (err) {
2282                 printk(KERN_ERR "EXT3-fs: error creating journal.\n");
2283                 journal_destroy(journal);
2284                 return -EIO;
2285         }
2286
2287         EXT3_SB(sb)->s_journal = journal;
2288
2289         ext3_update_dynamic_rev(sb);
2290         EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2291         EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2292
2293         es->s_journal_inum = cpu_to_le32(journal_inum);
2294
2295         /* Make sure we flush the recovery flag to disk. */
2296         ext3_commit_super(sb, es, 1);
2297
2298         return 0;
2299 }
2300
2301 static int ext3_commit_super(struct super_block *sb,
2302                                struct ext3_super_block *es,
2303                                int sync)
2304 {
2305         struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
2306         int error = 0;
2307
2308         if (!sbh)
2309                 return error;
2310         es->s_wtime = cpu_to_le32(get_seconds());
2311         es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2312         es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2313         BUFFER_TRACE(sbh, "marking dirty");
2314         mark_buffer_dirty(sbh);
2315         if (sync)
2316                 error = sync_dirty_buffer(sbh);
2317         return error;
2318 }
2319
2320
2321 /*
2322  * Have we just finished recovery?  If so, and if we are mounting (or
2323  * remounting) the filesystem readonly, then we will end up with a
2324  * consistent fs on disk.  Record that fact.
2325  */
2326 static void ext3_mark_recovery_complete(struct super_block * sb,
2327                                         struct ext3_super_block * es)
2328 {
2329         journal_t *journal = EXT3_SB(sb)->s_journal;
2330
2331         journal_lock_updates(journal);
2332         if (journal_flush(journal) < 0)
2333                 goto out;
2334
2335         lock_super(sb);
2336         if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2337             sb->s_flags & MS_RDONLY) {
2338                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2339                 ext3_commit_super(sb, es, 1);
2340         }
2341         unlock_super(sb);
2342
2343 out:
2344         journal_unlock_updates(journal);
2345 }
2346
2347 /*
2348  * If we are mounting (or read-write remounting) a filesystem whose journal
2349  * has recorded an error from a previous lifetime, move that error to the
2350  * main filesystem now.
2351  */
2352 static void ext3_clear_journal_err(struct super_block * sb,
2353                                    struct ext3_super_block * es)
2354 {
2355         journal_t *journal;
2356         int j_errno;
2357         const char *errstr;
2358
2359         journal = EXT3_SB(sb)->s_journal;
2360
2361         /*
2362          * Now check for any error status which may have been recorded in the
2363          * journal by a prior ext3_error() or ext3_abort()
2364          */
2365
2366         j_errno = journal_errno(journal);
2367         if (j_errno) {
2368                 char nbuf[16];
2369
2370                 errstr = ext3_decode_error(sb, j_errno, nbuf);
2371                 ext3_warning(sb, __func__, "Filesystem error recorded "
2372                              "from previous mount: %s", errstr);
2373                 ext3_warning(sb, __func__, "Marking fs in need of "
2374                              "filesystem check.");
2375
2376                 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2377                 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2378                 ext3_commit_super (sb, es, 1);
2379
2380                 journal_clear_err(journal);
2381         }
2382 }
2383
2384 /*
2385  * Force the running and committing transactions to commit,
2386  * and wait on the commit.
2387  */
2388 int ext3_force_commit(struct super_block *sb)
2389 {
2390         journal_t *journal;
2391         int ret;
2392
2393         if (sb->s_flags & MS_RDONLY)
2394                 return 0;
2395
2396         journal = EXT3_SB(sb)->s_journal;
2397         ret = ext3_journal_force_commit(journal);
2398         return ret;
2399 }
2400
2401 static int ext3_sync_fs(struct super_block *sb, int wait)
2402 {
2403         tid_t target;
2404
2405         if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2406                 if (wait)
2407                         log_wait_commit(EXT3_SB(sb)->s_journal, target);
2408         }
2409         return 0;
2410 }
2411
2412 /*
2413  * LVM calls this function before a (read-only) snapshot is created.  This
2414  * gives us a chance to flush the journal completely and mark the fs clean.
2415  */
2416 static int ext3_freeze(struct super_block *sb)
2417 {
2418         int error = 0;
2419         journal_t *journal;
2420
2421         if (!(sb->s_flags & MS_RDONLY)) {
2422                 journal = EXT3_SB(sb)->s_journal;
2423
2424                 /* Now we set up the journal barrier. */
2425                 journal_lock_updates(journal);
2426
2427                 /*
2428                  * We don't want to clear needs_recovery flag when we failed
2429                  * to flush the journal.
2430                  */
2431                 error = journal_flush(journal);
2432                 if (error < 0)
2433                         goto out;
2434
2435                 /* Journal blocked and flushed, clear needs_recovery flag. */
2436                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2437                 error = ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2438                 if (error)
2439                         goto out;
2440         }
2441         return 0;
2442
2443 out:
2444         journal_unlock_updates(journal);
2445         return error;
2446 }
2447
2448 /*
2449  * Called by LVM after the snapshot is done.  We need to reset the RECOVER
2450  * flag here, even though the filesystem is not technically dirty yet.
2451  */
2452 static int ext3_unfreeze(struct super_block *sb)
2453 {
2454         if (!(sb->s_flags & MS_RDONLY)) {
2455                 lock_super(sb);
2456                 /* Reser the needs_recovery flag before the fs is unlocked. */
2457                 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2458                 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2459                 unlock_super(sb);
2460                 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2461         }
2462         return 0;
2463 }
2464
2465 static int ext3_remount (struct super_block * sb, int * flags, char * data)
2466 {
2467         struct ext3_super_block * es;
2468         struct ext3_sb_info *sbi = EXT3_SB(sb);
2469         ext3_fsblk_t n_blocks_count = 0;
2470         unsigned long old_sb_flags;
2471         struct ext3_mount_options old_opts;
2472         int err;
2473 #ifdef CONFIG_QUOTA
2474         int i;
2475 #endif
2476
2477         lock_kernel();
2478
2479         /* Store the original options */
2480         lock_super(sb);
2481         old_sb_flags = sb->s_flags;
2482         old_opts.s_mount_opt = sbi->s_mount_opt;
2483         old_opts.s_resuid = sbi->s_resuid;
2484         old_opts.s_resgid = sbi->s_resgid;
2485         old_opts.s_commit_interval = sbi->s_commit_interval;
2486 #ifdef CONFIG_QUOTA
2487         old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2488         for (i = 0; i < MAXQUOTAS; i++)
2489                 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2490 #endif
2491
2492         /*
2493          * Allow the "check" option to be passed as a remount option.
2494          */
2495         if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2496                 err = -EINVAL;
2497                 goto restore_opts;
2498         }
2499
2500         if (sbi->s_mount_opt & EXT3_MOUNT_ABORT)
2501                 ext3_abort(sb, __func__, "Abort forced by user");
2502
2503         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2504                 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2505
2506         es = sbi->s_es;
2507
2508         ext3_init_journal_params(sb, sbi->s_journal);
2509
2510         if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2511                 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
2512                 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT) {
2513                         err = -EROFS;
2514                         goto restore_opts;
2515                 }
2516
2517                 if (*flags & MS_RDONLY) {
2518                         /*
2519                          * First of all, the unconditional stuff we have to do
2520                          * to disable replay of the journal when we next remount
2521                          */
2522                         sb->s_flags |= MS_RDONLY;
2523
2524                         /*
2525                          * OK, test if we are remounting a valid rw partition
2526                          * readonly, and if so set the rdonly flag and then
2527                          * mark the partition as valid again.
2528                          */
2529                         if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2530                             (sbi->s_mount_state & EXT3_VALID_FS))
2531                                 es->s_state = cpu_to_le16(sbi->s_mount_state);
2532
2533                         /*
2534                          * We have to unlock super so that we can wait for
2535                          * transactions.
2536                          */
2537                         unlock_super(sb);
2538                         ext3_mark_recovery_complete(sb, es);
2539                         lock_super(sb);
2540                 } else {
2541                         __le32 ret;
2542                         if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2543                                         ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2544                                 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2545                                        "remount RDWR because of unsupported "
2546                                        "optional features (%x).\n",
2547                                        sb->s_id, le32_to_cpu(ret));
2548                                 err = -EROFS;
2549                                 goto restore_opts;
2550                         }
2551
2552                         /*
2553                          * If we have an unprocessed orphan list hanging
2554                          * around from a previously readonly bdev mount,
2555                          * require a full umount/remount for now.
2556                          */
2557                         if (es->s_last_orphan) {
2558                                 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2559                                        "remount RDWR because of unprocessed "
2560                                        "orphan inode list.  Please "
2561                                        "umount/remount instead.\n",
2562                                        sb->s_id);
2563                                 err = -EINVAL;
2564                                 goto restore_opts;
2565                         }
2566
2567                         /*
2568                          * Mounting a RDONLY partition read-write, so reread
2569                          * and store the current valid flag.  (It may have
2570                          * been changed by e2fsck since we originally mounted
2571                          * the partition.)
2572                          */
2573                         ext3_clear_journal_err(sb, es);
2574                         sbi->s_mount_state = le16_to_cpu(es->s_state);
2575                         if ((err = ext3_group_extend(sb, es, n_blocks_count)))
2576                                 goto restore_opts;
2577                         if (!ext3_setup_super (sb, es, 0))
2578                                 sb->s_flags &= ~MS_RDONLY;
2579                 }
2580         }
2581 #ifdef CONFIG_QUOTA
2582         /* Release old quota file names */
2583         for (i = 0; i < MAXQUOTAS; i++)
2584                 if (old_opts.s_qf_names[i] &&
2585                     old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2586                         kfree(old_opts.s_qf_names[i]);
2587 #endif
2588         unlock_super(sb);
2589         unlock_kernel();
2590         return 0;
2591 restore_opts:
2592         sb->s_flags = old_sb_flags;
2593         sbi->s_mount_opt = old_opts.s_mount_opt;
2594         sbi->s_resuid = old_opts.s_resuid;
2595         sbi->s_resgid = old_opts.s_resgid;
2596         sbi->s_commit_interval = old_opts.s_commit_interval;
2597 #ifdef CONFIG_QUOTA
2598         sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2599         for (i = 0; i < MAXQUOTAS; i++) {
2600                 if (sbi->s_qf_names[i] &&
2601                     old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2602                         kfree(sbi->s_qf_names[i]);
2603                 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2604         }
2605 #endif
2606         unlock_super(sb);
2607         unlock_kernel();
2608         return err;
2609 }
2610
2611 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
2612 {
2613         struct super_block *sb = dentry->d_sb;
2614         struct ext3_sb_info *sbi = EXT3_SB(sb);
2615         struct ext3_super_block *es = sbi->s_es;
2616         u64 fsid;
2617
2618         if (test_opt(sb, MINIX_DF)) {
2619                 sbi->s_overhead_last = 0;
2620         } else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
2621                 unsigned long ngroups = sbi->s_groups_count, i;
2622                 ext3_fsblk_t overhead = 0;
2623                 smp_rmb();
2624
2625                 /*
2626                  * Compute the overhead (FS structures).  This is constant
2627                  * for a given filesystem unless the number of block groups
2628                  * changes so we cache the previous value until it does.
2629                  */
2630
2631                 /*
2632                  * All of the blocks before first_data_block are
2633                  * overhead
2634                  */
2635                 overhead = le32_to_cpu(es->s_first_data_block);
2636
2637                 /*
2638                  * Add the overhead attributed to the superblock and
2639                  * block group descriptors.  If the sparse superblocks
2640                  * feature is turned on, then not all groups have this.
2641                  */
2642                 for (i = 0; i < ngroups; i++) {
2643                         overhead += ext3_bg_has_super(sb, i) +
2644                                 ext3_bg_num_gdb(sb, i);
2645                         cond_resched();
2646                 }
2647
2648                 /*
2649                  * Every block group has an inode bitmap, a block
2650                  * bitmap, and an inode table.
2651                  */
2652                 overhead += ngroups * (2 + sbi->s_itb_per_group);
2653                 sbi->s_overhead_last = overhead;
2654                 smp_wmb();
2655                 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
2656         }
2657
2658         buf->f_type = EXT3_SUPER_MAGIC;
2659         buf->f_bsize = sb->s_blocksize;
2660         buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
2661         buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
2662         es->s_free_blocks_count = cpu_to_le32(buf->f_bfree);
2663         buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2664         if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2665                 buf->f_bavail = 0;
2666         buf->f_files = le32_to_cpu(es->s_inodes_count);
2667         buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
2668         es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
2669         buf->f_namelen = EXT3_NAME_LEN;
2670         fsid = le64_to_cpup((void *)es->s_uuid) ^
2671                le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2672         buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2673         buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
2674         return 0;
2675 }
2676
2677 /* Helper function for writing quotas on sync - we need to start transaction before quota file
2678  * is locked for write. Otherwise the are possible deadlocks:
2679  * Process 1                         Process 2
2680  * ext3_create()                     quota_sync()
2681  *   journal_start()                   write_dquot()
2682  *   vfs_dq_init()                       down(dqio_mutex)
2683  *     down(dqio_mutex)                    journal_start()
2684  *
2685  */
2686
2687 #ifdef CONFIG_QUOTA
2688
2689 static inline struct inode *dquot_to_inode(struct dquot *dquot)
2690 {
2691         return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2692 }
2693
2694 static int ext3_write_dquot(struct dquot *dquot)
2695 {
2696         int ret, err;
2697         handle_t *handle;
2698         struct inode *inode;
2699
2700         inode = dquot_to_inode(dquot);
2701         handle = ext3_journal_start(inode,
2702                                         EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2703         if (IS_ERR(handle))
2704                 return PTR_ERR(handle);
2705         ret = dquot_commit(dquot);
2706         err = ext3_journal_stop(handle);
2707         if (!ret)
2708                 ret = err;
2709         return ret;
2710 }
2711
2712 static int ext3_acquire_dquot(struct dquot *dquot)
2713 {
2714         int ret, err;
2715         handle_t *handle;
2716
2717         handle = ext3_journal_start(dquot_to_inode(dquot),
2718                                         EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2719         if (IS_ERR(handle))
2720                 return PTR_ERR(handle);
2721         ret = dquot_acquire(dquot);
2722         err = ext3_journal_stop(handle);
2723         if (!ret)
2724                 ret = err;
2725         return ret;
2726 }
2727
2728 static int ext3_release_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_DEL_BLOCKS(dquot->dq_sb));
2735         if (IS_ERR(handle)) {
2736                 /* Release dquot anyway to avoid endless cycle in dqput() */
2737                 dquot_release(dquot);
2738                 return PTR_ERR(handle);
2739         }
2740         ret = dquot_release(dquot);
2741         err = ext3_journal_stop(handle);
2742         if (!ret)
2743                 ret = err;
2744         return ret;
2745 }
2746
2747 static int ext3_mark_dquot_dirty(struct dquot *dquot)
2748 {
2749         /* Are we journaling quotas? */
2750         if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2751             EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2752                 dquot_mark_dquot_dirty(dquot);
2753                 return ext3_write_dquot(dquot);
2754         } else {
2755                 return dquot_mark_dquot_dirty(dquot);
2756         }
2757 }
2758
2759 static int ext3_write_info(struct super_block *sb, int type)
2760 {
2761         int ret, err;
2762         handle_t *handle;
2763
2764         /* Data block + inode block */
2765         handle = ext3_journal_start(sb->s_root->d_inode, 2);
2766         if (IS_ERR(handle))
2767                 return PTR_ERR(handle);
2768         ret = dquot_commit_info(sb, type);
2769         err = ext3_journal_stop(handle);
2770         if (!ret)
2771                 ret = err;
2772         return ret;
2773 }
2774
2775 /*
2776  * Turn on quotas during mount time - we need to find
2777  * the quota file and such...
2778  */
2779 static int ext3_quota_on_mount(struct super_block *sb, int type)
2780 {
2781         return vfs_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2782                         EXT3_SB(sb)->s_jquota_fmt, type);
2783 }
2784
2785 /*
2786  * Standard function to be called on quota_on
2787  */
2788 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
2789                          char *name, int remount)
2790 {
2791         int err;
2792         struct path path;
2793
2794         if (!test_opt(sb, QUOTA))
2795                 return -EINVAL;
2796         /* When remounting, no checks are needed and in fact, name is NULL */
2797         if (remount)
2798                 return vfs_quota_on(sb, type, format_id, name, remount);
2799
2800         err = kern_path(name, LOOKUP_FOLLOW, &path);
2801         if (err)
2802                 return err;
2803
2804         /* Quotafile not on the same filesystem? */
2805         if (path.mnt->mnt_sb != sb) {
2806                 path_put(&path);
2807                 return -EXDEV;
2808         }
2809         /* Journaling quota? */
2810         if (EXT3_SB(sb)->s_qf_names[type]) {
2811                 /* Quotafile not of fs root? */
2812                 if (path.dentry->d_parent != sb->s_root)
2813                         printk(KERN_WARNING
2814                                 "EXT3-fs: Quota file not on filesystem root. "
2815                                 "Journaled quota will not work.\n");
2816         }
2817
2818         /*
2819          * When we journal data on quota file, we have to flush journal to see
2820          * all updates to the file when we bypass pagecache...
2821          */
2822         if (ext3_should_journal_data(path.dentry->d_inode)) {
2823                 /*
2824                  * We don't need to lock updates but journal_flush() could
2825                  * otherwise be livelocked...
2826                  */
2827                 journal_lock_updates(EXT3_SB(sb)->s_journal);
2828                 err = journal_flush(EXT3_SB(sb)->s_journal);
2829                 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2830                 if (err) {
2831                         path_put(&path);
2832                         return err;
2833                 }
2834         }
2835
2836         err = vfs_quota_on_path(sb, type, format_id, &path);
2837         path_put(&path);
2838         return err;
2839 }
2840
2841 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2842  * acquiring the locks... As quota files are never truncated and quota code
2843  * itself serializes the operations (and noone else should touch the files)
2844  * we don't have to be afraid of races */
2845 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2846                                size_t len, loff_t off)
2847 {
2848         struct inode *inode = sb_dqopt(sb)->files[type];
2849         sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2850         int err = 0;
2851         int offset = off & (sb->s_blocksize - 1);
2852         int tocopy;
2853         size_t toread;
2854         struct buffer_head *bh;
2855         loff_t i_size = i_size_read(inode);
2856
2857         if (off > i_size)
2858                 return 0;
2859         if (off+len > i_size)
2860                 len = i_size-off;
2861         toread = len;
2862         while (toread > 0) {
2863                 tocopy = sb->s_blocksize - offset < toread ?
2864                                 sb->s_blocksize - offset : toread;
2865                 bh = ext3_bread(NULL, inode, blk, 0, &err);
2866                 if (err)
2867                         return err;
2868                 if (!bh)        /* A hole? */
2869                         memset(data, 0, tocopy);
2870                 else
2871                         memcpy(data, bh->b_data+offset, tocopy);
2872                 brelse(bh);
2873                 offset = 0;
2874                 toread -= tocopy;
2875                 data += tocopy;
2876                 blk++;
2877         }
2878         return len;
2879 }
2880
2881 /* Write to quotafile (we know the transaction is already started and has
2882  * enough credits) */
2883 static ssize_t ext3_quota_write(struct super_block *sb, int type,
2884                                 const char *data, size_t len, loff_t off)
2885 {
2886         struct inode *inode = sb_dqopt(sb)->files[type];
2887         sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2888         int err = 0;
2889         int offset = off & (sb->s_blocksize - 1);
2890         int tocopy;
2891         int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
2892         size_t towrite = len;
2893         struct buffer_head *bh;
2894         handle_t *handle = journal_current_handle();
2895
2896         if (!handle) {
2897                 printk(KERN_WARNING "EXT3-fs: Quota write (off=%Lu, len=%Lu)"
2898                         " cancelled because transaction is not started.\n",
2899                         (unsigned long long)off, (unsigned long long)len);
2900                 return -EIO;
2901         }
2902         mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2903         while (towrite > 0) {
2904                 tocopy = sb->s_blocksize - offset < towrite ?
2905                                 sb->s_blocksize - offset : towrite;
2906                 bh = ext3_bread(handle, inode, blk, 1, &err);
2907                 if (!bh)
2908                         goto out;
2909                 if (journal_quota) {
2910                         err = ext3_journal_get_write_access(handle, bh);
2911                         if (err) {
2912                                 brelse(bh);
2913                                 goto out;
2914                         }
2915                 }
2916                 lock_buffer(bh);
2917                 memcpy(bh->b_data+offset, data, tocopy);
2918                 flush_dcache_page(bh->b_page);
2919                 unlock_buffer(bh);
2920                 if (journal_quota)
2921                         err = ext3_journal_dirty_metadata(handle, bh);
2922                 else {
2923                         /* Always do at least ordered writes for quotas */
2924                         err = ext3_journal_dirty_data(handle, bh);
2925                         mark_buffer_dirty(bh);
2926                 }
2927                 brelse(bh);
2928                 if (err)
2929                         goto out;
2930                 offset = 0;
2931                 towrite -= tocopy;
2932                 data += tocopy;
2933                 blk++;
2934         }
2935 out:
2936         if (len == towrite) {
2937                 mutex_unlock(&inode->i_mutex);
2938                 return err;
2939         }
2940         if (inode->i_size < off+len-towrite) {
2941                 i_size_write(inode, off+len-towrite);
2942                 EXT3_I(inode)->i_disksize = inode->i_size;
2943         }
2944         inode->i_version++;
2945         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2946         ext3_mark_inode_dirty(handle, inode);
2947         mutex_unlock(&inode->i_mutex);
2948         return len - towrite;
2949 }
2950
2951 #endif
2952
2953 static int ext3_get_sb(struct file_system_type *fs_type,
2954         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
2955 {
2956         return get_sb_bdev(fs_type, flags, dev_name, data, ext3_fill_super, mnt);
2957 }
2958
2959 static struct file_system_type ext3_fs_type = {
2960         .owner          = THIS_MODULE,
2961         .name           = "ext3",
2962         .get_sb         = ext3_get_sb,
2963         .kill_sb        = kill_block_super,
2964         .fs_flags       = FS_REQUIRES_DEV,
2965 };
2966
2967 static int __init init_ext3_fs(void)
2968 {
2969         int err = init_ext3_xattr();
2970         if (err)
2971                 return err;
2972         err = init_inodecache();
2973         if (err)
2974                 goto out1;
2975         err = register_filesystem(&ext3_fs_type);
2976         if (err)
2977                 goto out;
2978         return 0;
2979 out:
2980         destroy_inodecache();
2981 out1:
2982         exit_ext3_xattr();
2983         return err;
2984 }
2985
2986 static void __exit exit_ext3_fs(void)
2987 {
2988         unregister_filesystem(&ext3_fs_type);
2989         destroy_inodecache();
2990         exit_ext3_xattr();
2991 }
2992
2993 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
2994 MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
2995 MODULE_LICENSE("GPL");
2996 module_init(init_ext3_fs)
2997 module_exit(exit_ext3_fs)