fs/ext3/super.c

   1 /*
   2  *  linux/fs/ext3/super.c
   3  *
   4  * Copyright (C) 1992, 1993, 1994, 1995
   5  * Remy Card (card@masi.ibp.fr)
   6  * Laboratoire MASI - Institut Blaise Pascal
   7  * Universite Pierre et Marie Curie (Paris VI)
   8  *
   9  *  from
  10  *
  11  *  linux/fs/minix/inode.c
  12  *
  13  *  Copyright (C) 1991, 1992  Linus Torvalds
  14  *
  15  *  Big-endian to little-endian byte-swapping/bitmaps by
  16  *        David S. Miller (davem@caip.rutgers.edu), 1995
  17  */
  18
  19 #include <linux/module.h>
  20 #include <linux/string.h>
  21 #include <linux/fs.h>
  22 #include <linux/time.h>
  23 #include <linux/jbd.h>
  24 #include <linux/ext3_fs.h>
  25 #include <linux/ext3_jbd.h>
  26 #include <linux/slab.h>
  27 #include <linux/init.h>
  28 #include <linux/blkdev.h>
  29 #include <linux/parser.h>
  30 #include <linux/smp_lock.h>
  31 #include <linux/buffer_head.h>
  32 #include <linux/exportfs.h>
  33 #include <linux/vfs.h>
  34 #include <linux/random.h>
  35 #include <linux/mount.h>
  36 #include <linux/namei.h>
  37 #include <linux/quotaops.h>
  38 #include <linux/seq_file.h>
  39 #include <linux/log2.h>
  40
  41 #include <asm/uaccess.h>
  42
  43 #include "xattr.h"
  44 #include "acl.h"
  45 #include "namei.h"
  46
  47 static int ext3_load_journal(struct super_block *, struct ext3_super_block *,
  48                              unsigned long journal_devnum);
  49 static int ext3_create_journal(struct super_block *, struct ext3_super_block *,
  50                                unsigned int);
  51 static void ext3_commit_super (struct super_block * sb,
  52                                struct ext3_super_block * es,
  53                                int sync);
  54 static void ext3_mark_recovery_complete(struct super_block * sb,
  55                                         struct ext3_super_block * es);
  56 static void ext3_clear_journal_err(struct super_block * sb,
  57                                    struct ext3_super_block * es);
  58 static int ext3_sync_fs(struct super_block *sb, int wait);
  59 static const char *ext3_decode_error(struct super_block * sb, int errno,
  60                                      char nbuf[16]);
  61 static int ext3_remount (struct super_block * sb, int * flags, char * data);
  62 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf);
  63 static void ext3_unlockfs(struct super_block *sb);
  64 static void ext3_write_super (struct super_block * sb);
  65 static void ext3_write_super_lockfs(struct super_block *sb);
  66
  67 /*
  68  * Wrappers for journal_start/end.
  69  *
  70  * The only special thing we need to do here is to make sure that all
  71  * journal_end calls result in the superblock being marked dirty, so
  72  * that sync() will call the filesystem's write_super callback if
  73  * appropriate.
  74  */
  75 handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks)
  76 {
  77         journal_t *journal;
  78
  79         if (sb->s_flags & MS_RDONLY)
  80                 return ERR_PTR(-EROFS);
  81
  82         /* Special case here: if the journal has aborted behind our
  83          * backs (eg. EIO in the commit thread), then we still need to
  84          * take the FS itself readonly cleanly. */
  85         journal = EXT3_SB(sb)->s_journal;
  86         if (is_journal_aborted(journal)) {
  87                 ext3_abort(sb, __func__,
  88                            "Detected aborted journal");
  89                 return ERR_PTR(-EROFS);
  90         }
  91
  92         return journal_start(journal, nblocks);
  93 }
  94
  95 /*
  96  * The only special thing we need to do here is to make sure that all
  97  * journal_stop calls result in the superblock being marked dirty, so
  98  * that sync() will call the filesystem's write_super callback if
  99  * appropriate.
 100  */
 101 int __ext3_journal_stop(const char *where, handle_t *handle)
 102 {
 103         struct super_block *sb;
 104         int err;
 105         int rc;
 106
 107         sb = handle->h_transaction->t_journal->j_private;
 108         err = handle->h_err;
 109         rc = journal_stop(handle);
 110
 111         if (!err)
 112                 err = rc;
 113         if (err)
 114                 __ext3_std_error(sb, where, err);
 115         return err;
 116 }
 117
 118 void ext3_journal_abort_handle(const char *caller, const char *err_fn,
 119                 struct buffer_head *bh, handle_t *handle, int err)
 120 {
 121         char nbuf[16];
 122         const char *errstr = ext3_decode_error(NULL, err, nbuf);
 123
 124         if (bh)
 125                 BUFFER_TRACE(bh, "abort");
 126
 127         if (!handle->h_err)
 128                 handle->h_err = err;
 129
 130         if (is_handle_aborted(handle))
 131                 return;
 132
 133         printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
 134                caller, errstr, err_fn);
 135
 136         journal_abort_handle(handle);
 137 }
 138
 139 /* Deal with the reporting of failure conditions on a filesystem such as
 140  * inconsistencies detected or read IO failures.
 141  *
 142  * On ext2, we can store the error state of the filesystem in the
 143  * superblock.  That is not possible on ext3, because we may have other
 144  * write ordering constraints on the superblock which prevent us from
 145  * writing it out straight away; and given that the journal is about to
 146  * be aborted, we can't rely on the current, or future, transactions to
 147  * write out the superblock safely.
 148  *
 149  * We'll just use the journal_abort() error code to record an error in
 150  * the journal instead.  On recovery, the journal will compain about
 151  * that error until we've noted it down and cleared it.
 152  */
 153
 154 static void ext3_handle_error(struct super_block *sb)
 155 {
 156         struct ext3_super_block *es = EXT3_SB(sb)->s_es;
 157
 158         EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
 159         es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
 160
 161         if (sb->s_flags & MS_RDONLY)
 162                 return;
 163
 164         if (!test_opt (sb, ERRORS_CONT)) {
 165                 journal_t *journal = EXT3_SB(sb)->s_journal;
 166
 167                 EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
 168                 if (journal)
 169                         journal_abort(journal, -EIO);
 170         }
 171         if (test_opt (sb, ERRORS_RO)) {
 172                 printk (KERN_CRIT "Remounting filesystem read-only\n");
 173                 sb->s_flags |= MS_RDONLY;
 174         }
 175         ext3_commit_super(sb, es, 1);
 176         if (test_opt(sb, ERRORS_PANIC))
 177                 panic("EXT3-fs (device %s): panic forced after error\n",
 178                         sb->s_id);
 179 }
 180
 181 void ext3_error (struct super_block * sb, const char * function,
 182                  const char * fmt, ...)
 183 {
 184         va_list args;
 185
 186         va_start(args, fmt);
 187         printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
 188         vprintk(fmt, args);
 189         printk("\n");
 190         va_end(args);
 191
 192         ext3_handle_error(sb);
 193 }
 194
 195 static const char *ext3_decode_error(struct super_block * sb, int errno,
 196                                      char nbuf[16])
 197 {
 198         char *errstr = NULL;
 199
 200         switch (errno) {
 201         case -EIO:
 202                 errstr = "IO failure";
 203                 break;
 204         case -ENOMEM:
 205                 errstr = "Out of memory";
 206                 break;
 207         case -EROFS:
 208                 if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT)
 209                         errstr = "Journal has aborted";
 210                 else
 211                         errstr = "Readonly filesystem";
 212                 break;
 213         default:
 214                 /* If the caller passed in an extra buffer for unknown
 215                  * errors, textualise them now.  Else we just return
 216                  * NULL. */
 217                 if (nbuf) {
 218                         /* Check for truncated error codes... */
 219                         if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
 220                                 errstr = nbuf;
 221                 }
 222                 break;
 223         }
 224
 225         return errstr;
 226 }
 227
 228 /* __ext3_std_error decodes expected errors from journaling functions
 229  * automatically and invokes the appropriate error response.  */
 230
 231 void __ext3_std_error (struct super_block * sb, const char * function,
 232                        int errno)
 233 {
 234         char nbuf[16];
 235         const char *errstr;
 236
 237         /* Special case: if the error is EROFS, and we're not already
 238          * inside a transaction, then there's really no point in logging
 239          * an error. */
 240         if (errno == -EROFS && journal_current_handle() == NULL &&
 241             (sb->s_flags & MS_RDONLY))
 242                 return;
 243
 244         errstr = ext3_decode_error(sb, errno, nbuf);
 245         printk (KERN_CRIT "EXT3-fs error (device %s) in %s: %s\n",
 246                 sb->s_id, function, errstr);
 247
 248         ext3_handle_error(sb);
 249 }
 250
 251 /*
 252  * ext3_abort is a much stronger failure handler than ext3_error.  The
 253  * abort function may be used to deal with unrecoverable failures such
 254  * as journal IO errors or ENOMEM at a critical moment in log management.
 255  *
 256  * We unconditionally force the filesystem into an ABORT|READONLY state,
 257  * unless the error response on the fs has been set to panic in which
 258  * case we take the easy way out and panic immediately.
 259  */
 260
 261 void ext3_abort (struct super_block * sb, const char * function,
 262                  const char * fmt, ...)
 263 {
 264         va_list args;
 265
 266         printk (KERN_CRIT "ext3_abort called.\n");
 267
 268         va_start(args, fmt);
 269         printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
 270         vprintk(fmt, args);
 271         printk("\n");
 272         va_end(args);
 273
 274         if (test_opt(sb, ERRORS_PANIC))
 275                 panic("EXT3-fs panic from previous error\n");
 276
 277         if (sb->s_flags & MS_RDONLY)
 278                 return;
 279
 280         printk(KERN_CRIT "Remounting filesystem read-only\n");
 281         EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
 282         sb->s_flags |= MS_RDONLY;
 283         EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
 284         journal_abort(EXT3_SB(sb)->s_journal, -EIO);
 285 }
 286
 287 void ext3_warning (struct super_block * sb, const char * function,
 288                    const char * fmt, ...)
 289 {
 290         va_list args;
 291
 292         va_start(args, fmt);
 293         printk(KERN_WARNING "EXT3-fs warning (device %s): %s: ",
 294                sb->s_id, function);
 295         vprintk(fmt, args);
 296         printk("\n");
 297         va_end(args);
 298 }
 299
 300 void ext3_update_dynamic_rev(struct super_block *sb)
 301 {
 302         struct ext3_super_block *es = EXT3_SB(sb)->s_es;
 303
 304         if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
 305                 return;
 306
 307         ext3_warning(sb, __func__,
 308                      "updating to rev %d because of new feature flag, "
 309                      "running e2fsck is recommended",
 310                      EXT3_DYNAMIC_REV);
 311
 312         es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO);
 313         es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE);
 314         es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV);
 315         /* leave es->s_feature_*compat flags alone */
 316         /* es->s_uuid will be set by e2fsck if empty */
 317
 318         /*
 319          * The rest of the superblock fields should be zero, and if not it
 320          * means they are likely already in use, so leave them alone.  We
 321          * can leave it up to e2fsck to clean up any inconsistencies there.
 322          */
 323 }
 324
 325 /*
 326  * Open the external journal device
 327  */
 328 static struct block_device *ext3_blkdev_get(dev_t dev)
 329 {
 330         struct block_device *bdev;
 331         char b[BDEVNAME_SIZE];
 332
 333         bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
 334         if (IS_ERR(bdev))
 335                 goto fail;
 336         return bdev;
 337
 338 fail:
 339         printk(KERN_ERR "EXT3: failed to open journal device %s: %ld\n",
 340                         __bdevname(dev, b), PTR_ERR(bdev));
 341         return NULL;
 342 }
 343
 344 /*
 345  * Release the journal device
 346  */
 347 static int ext3_blkdev_put(struct block_device *bdev)
 348 {
 349         bd_release(bdev);
 350         return blkdev_put(bdev);
 351 }
 352
 353 static int ext3_blkdev_remove(struct ext3_sb_info *sbi)
 354 {
 355         struct block_device *bdev;
 356         int ret = -ENODEV;
 357
 358         bdev = sbi->journal_bdev;
 359         if (bdev) {
 360                 ret = ext3_blkdev_put(bdev);
 361                 sbi->journal_bdev = NULL;
 362         }
 363         return ret;
 364 }
 365
 366 static inline struct inode *orphan_list_entry(struct list_head *l)
 367 {
 368         return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
 369 }
 370
 371 static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
 372 {
 373         struct list_head *l;
 374
 375         printk(KERN_ERR "sb orphan head is %d\n",
 376                le32_to_cpu(sbi->s_es->s_last_orphan));
 377
 378         printk(KERN_ERR "sb_info orphan list:\n");
 379         list_for_each(l, &sbi->s_orphan) {
 380                 struct inode *inode = orphan_list_entry(l);
 381                 printk(KERN_ERR "  "
 382                        "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
 383                        inode->i_sb->s_id, inode->i_ino, inode,
 384                        inode->i_mode, inode->i_nlink,
 385                        NEXT_ORPHAN(inode));
 386         }
 387 }
 388
 389 static void ext3_put_super (struct super_block * sb)
 390 {
 391         struct ext3_sb_info *sbi = EXT3_SB(sb);
 392         struct ext3_super_block *es = sbi->s_es;
 393         int i;
 394
 395         ext3_xattr_put_super(sb);
 396         journal_destroy(sbi->s_journal);
 397         if (!(sb->s_flags & MS_RDONLY)) {
 398                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
 399                 es->s_state = cpu_to_le16(sbi->s_mount_state);
 400                 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
 401                 mark_buffer_dirty(sbi->s_sbh);
 402                 ext3_commit_super(sb, es, 1);
 403         }
 404
 405         for (i = 0; i < sbi->s_gdb_count; i++)
 406                 brelse(sbi->s_group_desc[i]);
 407         kfree(sbi->s_group_desc);
 408         percpu_counter_destroy(&sbi->s_freeblocks_counter);
 409         percpu_counter_destroy(&sbi->s_freeinodes_counter);
 410         percpu_counter_destroy(&sbi->s_dirs_counter);
 411         brelse(sbi->s_sbh);
 412 #ifdef CONFIG_QUOTA
 413         for (i = 0; i < MAXQUOTAS; i++)
 414                 kfree(sbi->s_qf_names[i]);
 415 #endif
 416
 417         /* Debugging code just in case the in-memory inode orphan list
 418          * isn't empty.  The on-disk one can be non-empty if we've
 419          * detected an error and taken the fs readonly, but the
 420          * in-memory list had better be clean by this point. */
 421         if (!list_empty(&sbi->s_orphan))
 422                 dump_orphan_list(sb, sbi);
 423         J_ASSERT(list_empty(&sbi->s_orphan));
 424
 425         invalidate_bdev(sb->s_bdev);
 426         if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
 427                 /*
 428                  * Invalidate the journal device's buffers.  We don't want them
 429                  * floating about in memory - the physical journal device may
 430                  * hotswapped, and it breaks the `ro-after' testing code.
 431                  */
 432                 sync_blockdev(sbi->journal_bdev);
 433                 invalidate_bdev(sbi->journal_bdev);
 434                 ext3_blkdev_remove(sbi);
 435         }
 436         sb->s_fs_info = NULL;
 437         kfree(sbi);
 438         return;
 439 }
 440
 441 static struct kmem_cache *ext3_inode_cachep;
 442
 443 /*
 444  * Called inside transaction, so use GFP_NOFS
 445  */
 446 static struct inode *ext3_alloc_inode(struct super_block *sb)
 447 {
 448         struct ext3_inode_info *ei;
 449
 450         ei = kmem_cache_alloc(ext3_inode_cachep, GFP_NOFS);
 451         if (!ei)
 452                 return NULL;
 453 #ifdef CONFIG_EXT3_FS_POSIX_ACL
 454         ei->i_acl = EXT3_ACL_NOT_CACHED;
 455         ei->i_default_acl = EXT3_ACL_NOT_CACHED;
 456 #endif
 457         ei->i_block_alloc_info = NULL;
 458         ei->vfs_inode.i_version = 1;
 459         return &ei->vfs_inode;
 460 }
 461
 462 static void ext3_destroy_inode(struct inode *inode)
 463 {
 464         if (!list_empty(&(EXT3_I(inode)->i_orphan))) {
 465                 printk("EXT3 Inode %p: orphan list check failed!\n",
 466                         EXT3_I(inode));
 467                 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
 468                                 EXT3_I(inode), sizeof(struct ext3_inode_info),
 469                                 false);
 470                 dump_stack();
 471         }
 472         kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
 473 }
 474
 475 static void init_once(void *foo)
 476 {
 477         struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
 478
 479         INIT_LIST_HEAD(&ei->i_orphan);
 480 #ifdef CONFIG_EXT3_FS_XATTR
 481         init_rwsem(&ei->xattr_sem);
 482 #endif
 483         mutex_init(&ei->truncate_mutex);
 484         inode_init_once(&ei->vfs_inode);
 485 }
 486
 487 static int init_inodecache(void)
 488 {
 489         ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
 490                                              sizeof(struct ext3_inode_info),
 491                                              0, (SLAB_RECLAIM_ACCOUNT|
 492                                                 SLAB_MEM_SPREAD),
 493                                              init_once);
 494         if (ext3_inode_cachep == NULL)
 495                 return -ENOMEM;
 496         return 0;
 497 }
 498
 499 static void destroy_inodecache(void)
 500 {
 501         kmem_cache_destroy(ext3_inode_cachep);
 502 }
 503
 504 static void ext3_clear_inode(struct inode *inode)
 505 {
 506         struct ext3_block_alloc_info *rsv = EXT3_I(inode)->i_block_alloc_info;
 507 #ifdef CONFIG_EXT3_FS_POSIX_ACL
 508         if (EXT3_I(inode)->i_acl &&
 509                         EXT3_I(inode)->i_acl != EXT3_ACL_NOT_CACHED) {
 510                 posix_acl_release(EXT3_I(inode)->i_acl);
 511                 EXT3_I(inode)->i_acl = EXT3_ACL_NOT_CACHED;
 512         }
 513         if (EXT3_I(inode)->i_default_acl &&
 514                         EXT3_I(inode)->i_default_acl != EXT3_ACL_NOT_CACHED) {
 515                 posix_acl_release(EXT3_I(inode)->i_default_acl);
 516                 EXT3_I(inode)->i_default_acl = EXT3_ACL_NOT_CACHED;
 517         }
 518 #endif
 519         ext3_discard_reservation(inode);
 520         EXT3_I(inode)->i_block_alloc_info = NULL;
 521         if (unlikely(rsv))
 522                 kfree(rsv);
 523 }
 524
 525 static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
 526 {
 527 #if defined(CONFIG_QUOTA)
 528         struct ext3_sb_info *sbi = EXT3_SB(sb);
 529
 530         if (sbi->s_jquota_fmt)
 531                 seq_printf(seq, ",jqfmt=%s",
 532                 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0");
 533
 534         if (sbi->s_qf_names[USRQUOTA])
 535                 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
 536
 537         if (sbi->s_qf_names[GRPQUOTA])
 538                 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
 539
 540         if (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA)
 541                 seq_puts(seq, ",usrquota");
 542
 543         if (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)
 544                 seq_puts(seq, ",grpquota");
 545 #endif
 546 }
 547
 548 /*
 549  * Show an option if
 550  *  - it's set to a non-default value OR
 551  *  - if the per-sb default is different from the global default
 552  */
 553 static int ext3_show_options(struct seq_file *seq, struct vfsmount *vfs)
 554 {
 555         struct super_block *sb = vfs->mnt_sb;
 556         struct ext3_sb_info *sbi = EXT3_SB(sb);
 557         struct ext3_super_block *es = sbi->s_es;
 558         unsigned long def_mount_opts;
 559
 560         def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
 561
 562         if (sbi->s_sb_block != 1)
 563                 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
 564         if (test_opt(sb, MINIX_DF))
 565                 seq_puts(seq, ",minixdf");
 566         if (test_opt(sb, GRPID))
 567                 seq_puts(seq, ",grpid");
 568         if (!test_opt(sb, GRPID) && (def_mount_opts & EXT3_DEFM_BSDGROUPS))
 569                 seq_puts(seq, ",nogrpid");
 570         if (sbi->s_resuid != EXT3_DEF_RESUID ||
 571             le16_to_cpu(es->s_def_resuid) != EXT3_DEF_RESUID) {
 572                 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
 573         }
 574         if (sbi->s_resgid != EXT3_DEF_RESGID ||
 575             le16_to_cpu(es->s_def_resgid) != EXT3_DEF_RESGID) {
 576                 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
 577         }
 578         if (test_opt(sb, ERRORS_RO)) {
 579                 int def_errors = le16_to_cpu(es->s_errors);
 580
 581                 if (def_errors == EXT3_ERRORS_PANIC ||
 582                     def_errors == EXT3_ERRORS_CONTINUE) {
 583                         seq_puts(seq, ",errors=remount-ro");
 584                 }
 585         }
 586         if (test_opt(sb, ERRORS_CONT))
 587                 seq_puts(seq, ",errors=continue");
 588         if (test_opt(sb, ERRORS_PANIC))
 589                 seq_puts(seq, ",errors=panic");
 590         if (test_opt(sb, NO_UID32))
 591                 seq_puts(seq, ",nouid32");
 592         if (test_opt(sb, DEBUG))
 593                 seq_puts(seq, ",debug");
 594         if (test_opt(sb, OLDALLOC))
 595                 seq_puts(seq, ",oldalloc");
 596 #ifdef CONFIG_EXT3_FS_XATTR
 597         if (test_opt(sb, XATTR_USER))
 598                 seq_puts(seq, ",user_xattr");
 599         if (!test_opt(sb, XATTR_USER) &&
 600             (def_mount_opts & EXT3_DEFM_XATTR_USER)) {
 601                 seq_puts(seq, ",nouser_xattr");
 602         }
 603 #endif
 604 #ifdef CONFIG_EXT3_FS_POSIX_ACL
 605         if (test_opt(sb, POSIX_ACL))
 606                 seq_puts(seq, ",acl");
 607         if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT3_DEFM_ACL))
 608                 seq_puts(seq, ",noacl");
 609 #endif
 610         if (!test_opt(sb, RESERVATION))
 611                 seq_puts(seq, ",noreservation");
 612         if (sbi->s_commit_interval) {
 613                 seq_printf(seq, ",commit=%u",
 614                            (unsigned) (sbi->s_commit_interval / HZ));
 615         }
 616         if (test_opt(sb, BARRIER))
 617                 seq_puts(seq, ",barrier=1");
 618         if (test_opt(sb, NOBH))
 619                 seq_puts(seq, ",nobh");
 620
 621         if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA)
 622                 seq_puts(seq, ",data=journal");
 623         else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA)
 624                 seq_puts(seq, ",data=ordered");
 625         else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)
 626                 seq_puts(seq, ",data=writeback");
 627
 628         if (test_opt(sb, DATA_ERR_ABORT))
 629                 seq_puts(seq, ",data_err=abort");
 630
 631         ext3_show_quota_options(seq, sb);
 632
 633         return 0;
 634 }
 635
 636
 637 static struct inode *ext3_nfs_get_inode(struct super_block *sb,
 638                 u64 ino, u32 generation)
 639 {
 640         struct inode *inode;
 641
 642         if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO)
 643                 return ERR_PTR(-ESTALE);
 644         if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count))
 645                 return ERR_PTR(-ESTALE);
 646
 647         /* iget isn't really right if the inode is currently unallocated!!
 648          *
 649          * ext3_read_inode will return a bad_inode if the inode had been
 650          * deleted, so we should be safe.
 651          *
 652          * Currently we don't know the generation for parent directory, so
 653          * a generation of 0 means "accept any"
 654          */
 655         inode = ext3_iget(sb, ino);
 656         if (IS_ERR(inode))
 657                 return ERR_CAST(inode);
 658         if (generation && inode->i_generation != generation) {
 659                 iput(inode);
 660                 return ERR_PTR(-ESTALE);
 661         }
 662
 663         return inode;
 664 }
 665
 666 static struct dentry *ext3_fh_to_dentry(struct super_block *sb, struct fid *fid,
 667                 int fh_len, int fh_type)
 668 {
 669         return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
 670                                     ext3_nfs_get_inode);
 671 }
 672
 673 static struct dentry *ext3_fh_to_parent(struct super_block *sb, struct fid *fid,
 674                 int fh_len, int fh_type)
 675 {
 676         return generic_fh_to_parent(sb, fid, fh_len, fh_type,
 677                                     ext3_nfs_get_inode);
 678 }
 679
 680 #ifdef CONFIG_QUOTA
 681 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
 682 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
 683
 684 static int ext3_dquot_initialize(struct inode *inode, int type);
 685 static int ext3_dquot_drop(struct inode *inode);
 686 static int ext3_write_dquot(struct dquot *dquot);
 687 static int ext3_acquire_dquot(struct dquot *dquot);
 688 static int ext3_release_dquot(struct dquot *dquot);
 689 static int ext3_mark_dquot_dirty(struct dquot *dquot);
 690 static int ext3_write_info(struct super_block *sb, int type);
 691 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
 692                                 char *path, int remount);
 693 static int ext3_quota_on_mount(struct super_block *sb, int type);
 694 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
 695                                size_t len, loff_t off);
 696 static ssize_t ext3_quota_write(struct super_block *sb, int type,
 697                                 const char *data, size_t len, loff_t off);
 698
 699 static struct dquot_operations ext3_quota_operations = {
 700         .initialize     = ext3_dquot_initialize,
 701         .drop           = ext3_dquot_drop,
 702         .alloc_space    = dquot_alloc_space,
 703         .alloc_inode    = dquot_alloc_inode,
 704         .free_space     = dquot_free_space,
 705         .free_inode     = dquot_free_inode,
 706         .transfer       = dquot_transfer,
 707         .write_dquot    = ext3_write_dquot,
 708         .acquire_dquot  = ext3_acquire_dquot,
 709         .release_dquot  = ext3_release_dquot,
 710         .mark_dirty     = ext3_mark_dquot_dirty,
 711         .write_info     = ext3_write_info
 712 };
 713
 714 static struct quotactl_ops ext3_qctl_operations = {
 715         .quota_on       = ext3_quota_on,
 716         .quota_off      = vfs_quota_off,
 717         .quota_sync     = vfs_quota_sync,
 718         .get_info       = vfs_get_dqinfo,
 719         .set_info       = vfs_set_dqinfo,
 720         .get_dqblk      = vfs_get_dqblk,
 721         .set_dqblk      = vfs_set_dqblk
 722 };
 723 #endif
 724
 725 static const struct super_operations ext3_sops = {
 726         .alloc_inode    = ext3_alloc_inode,
 727         .destroy_inode  = ext3_destroy_inode,
 728         .write_inode    = ext3_write_inode,
 729         .dirty_inode    = ext3_dirty_inode,
 730         .delete_inode   = ext3_delete_inode,
 731         .put_super      = ext3_put_super,
 732         .write_super    = ext3_write_super,
 733         .sync_fs        = ext3_sync_fs,
 734         .write_super_lockfs = ext3_write_super_lockfs,
 735         .unlockfs       = ext3_unlockfs,
 736         .statfs         = ext3_statfs,
 737         .remount_fs     = ext3_remount,
 738         .clear_inode    = ext3_clear_inode,
 739         .show_options   = ext3_show_options,
 740 #ifdef CONFIG_QUOTA
 741         .quota_read     = ext3_quota_read,
 742         .quota_write    = ext3_quota_write,
 743 #endif
 744 };
 745
 746 static const struct export_operations ext3_export_ops = {
 747         .fh_to_dentry = ext3_fh_to_dentry,
 748         .fh_to_parent = ext3_fh_to_parent,
 749         .get_parent = ext3_get_parent,
 750 };
 751
 752 enum {
 753         Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
 754         Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
 755         Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
 756         Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
 757         Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
 758         Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
 759         Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
 760         Opt_data_err_abort, Opt_data_err_ignore,
 761         Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
 762         Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
 763         Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
 764         Opt_grpquota
 765 };
 766
 767 static const match_table_t tokens = {
 768         {Opt_bsd_df, "bsddf"},
 769         {Opt_minix_df, "minixdf"},
 770         {Opt_grpid, "grpid"},
 771         {Opt_grpid, "bsdgroups"},
 772         {Opt_nogrpid, "nogrpid"},
 773         {Opt_nogrpid, "sysvgroups"},
 774         {Opt_resgid, "resgid=%u"},
 775         {Opt_resuid, "resuid=%u"},
 776         {Opt_sb, "sb=%u"},
 777         {Opt_err_cont, "errors=continue"},
 778         {Opt_err_panic, "errors=panic"},
 779         {Opt_err_ro, "errors=remount-ro"},
 780         {Opt_nouid32, "nouid32"},
 781         {Opt_nocheck, "nocheck"},
 782         {Opt_nocheck, "check=none"},
 783         {Opt_debug, "debug"},
 784         {Opt_oldalloc, "oldalloc"},
 785         {Opt_orlov, "orlov"},
 786         {Opt_user_xattr, "user_xattr"},
 787         {Opt_nouser_xattr, "nouser_xattr"},
 788         {Opt_acl, "acl"},
 789         {Opt_noacl, "noacl"},
 790         {Opt_reservation, "reservation"},
 791         {Opt_noreservation, "noreservation"},
 792         {Opt_noload, "noload"},
 793         {Opt_nobh, "nobh"},
 794         {Opt_bh, "bh"},
 795         {Opt_commit, "commit=%u"},
 796         {Opt_journal_update, "journal=update"},
 797         {Opt_journal_inum, "journal=%u"},
 798         {Opt_journal_dev, "journal_dev=%u"},
 799         {Opt_abort, "abort"},
 800         {Opt_data_journal, "data=journal"},
 801         {Opt_data_ordered, "data=ordered"},
 802         {Opt_data_writeback, "data=writeback"},
 803         {Opt_data_err_abort, "data_err=abort"},
 804         {Opt_data_err_ignore, "data_err=ignore"},
 805         {Opt_offusrjquota, "usrjquota="},
 806         {Opt_usrjquota, "usrjquota=%s"},
 807         {Opt_offgrpjquota, "grpjquota="},
 808         {Opt_grpjquota, "grpjquota=%s"},
 809         {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
 810         {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
 811         {Opt_grpquota, "grpquota"},
 812         {Opt_noquota, "noquota"},
 813         {Opt_quota, "quota"},
 814         {Opt_usrquota, "usrquota"},
 815         {Opt_barrier, "barrier=%u"},
 816         {Opt_resize, "resize"},
 817         {Opt_err, NULL},
 818 };
 819
 820 static ext3_fsblk_t get_sb_block(void **data)
 821 {
 822         ext3_fsblk_t    sb_block;
 823         char            *options = (char *) *data;
 824
 825         if (!options || strncmp(options, "sb=", 3) != 0)
 826                 return 1;       /* Default location */
 827         options += 3;
 828         /*todo: use simple_strtoll with >32bit ext3 */
 829         sb_block = simple_strtoul(options, &options, 0);
 830         if (*options && *options != ',') {
 831                 printk("EXT3-fs: Invalid sb specification: %s\n",
 832                        (char *) *data);
 833                 return 1;
 834         }
 835         if (*options == ',')
 836                 options++;
 837         *data = (void *) options;
 838         return sb_block;
 839 }
 840
 841 static int parse_options (char *options, struct super_block *sb,
 842                           unsigned int *inum, unsigned long *journal_devnum,
 843                           ext3_fsblk_t *n_blocks_count, int is_remount)
 844 {
 845         struct ext3_sb_info *sbi = EXT3_SB(sb);
 846         char * p;
 847         substring_t args[MAX_OPT_ARGS];
 848         int data_opt = 0;
 849         int option;
 850 #ifdef CONFIG_QUOTA
 851         int qtype, qfmt;
 852         char *qname;
 853 #endif
 854
 855         if (!options)
 856                 return 1;
 857
 858         while ((p = strsep (&options, ",")) != NULL) {
 859                 int token;
 860                 if (!*p)
 861                         continue;
 862
 863                 token = match_token(p, tokens, args);
 864                 switch (token) {
 865                 case Opt_bsd_df:
 866                         clear_opt (sbi->s_mount_opt, MINIX_DF);
 867                         break;
 868                 case Opt_minix_df:
 869                         set_opt (sbi->s_mount_opt, MINIX_DF);
 870                         break;
 871                 case Opt_grpid:
 872                         set_opt (sbi->s_mount_opt, GRPID);
 873                         break;
 874                 case Opt_nogrpid:
 875                         clear_opt (sbi->s_mount_opt, GRPID);
 876                         break;
 877                 case Opt_resuid:
 878                         if (match_int(&args[0], &option))
 879                                 return 0;
 880                         sbi->s_resuid = option;
 881                         break;
 882                 case Opt_resgid:
 883                         if (match_int(&args[0], &option))
 884                                 return 0;
 885                         sbi->s_resgid = option;
 886                         break;
 887                 case Opt_sb:
 888                         /* handled by get_sb_block() instead of here */
 889                         /* *sb_block = match_int(&args[0]); */
 890                         break;
 891                 case Opt_err_panic:
 892                         clear_opt (sbi->s_mount_opt, ERRORS_CONT);
 893                         clear_opt (sbi->s_mount_opt, ERRORS_RO);
 894                         set_opt (sbi->s_mount_opt, ERRORS_PANIC);
 895                         break;
 896                 case Opt_err_ro:
 897                         clear_opt (sbi->s_mount_opt, ERRORS_CONT);
 898                         clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
 899                         set_opt (sbi->s_mount_opt, ERRORS_RO);
 900                         break;
 901                 case Opt_err_cont:
 902                         clear_opt (sbi->s_mount_opt, ERRORS_RO);
 903                         clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
 904                         set_opt (sbi->s_mount_opt, ERRORS_CONT);
 905                         break;
 906                 case Opt_nouid32:
 907                         set_opt (sbi->s_mount_opt, NO_UID32);
 908                         break;
 909                 case Opt_nocheck:
 910                         clear_opt (sbi->s_mount_opt, CHECK);
 911                         break;
 912                 case Opt_debug:
 913                         set_opt (sbi->s_mount_opt, DEBUG);
 914                         break;
 915                 case Opt_oldalloc:
 916                         set_opt (sbi->s_mount_opt, OLDALLOC);
 917                         break;
 918                 case Opt_orlov:
 919                         clear_opt (sbi->s_mount_opt, OLDALLOC);
 920                         break;
 921 #ifdef CONFIG_EXT3_FS_XATTR
 922                 case Opt_user_xattr:
 923                         set_opt (sbi->s_mount_opt, XATTR_USER);
 924                         break;
 925                 case Opt_nouser_xattr:
 926                         clear_opt (sbi->s_mount_opt, XATTR_USER);
 927                         break;
 928 #else
 929                 case Opt_user_xattr:
 930                 case Opt_nouser_xattr:
 931                         printk("EXT3 (no)user_xattr options not supported\n");
 932                         break;
 933 #endif
 934 #ifdef CONFIG_EXT3_FS_POSIX_ACL
 935                 case Opt_acl:
 936                         set_opt(sbi->s_mount_opt, POSIX_ACL);
 937                         break;
 938                 case Opt_noacl:
 939                         clear_opt(sbi->s_mount_opt, POSIX_ACL);
 940                         break;
 941 #else
 942                 case Opt_acl:
 943                 case Opt_noacl:
 944                         printk("EXT3 (no)acl options not supported\n");
 945                         break;
 946 #endif
 947                 case Opt_reservation:
 948                         set_opt(sbi->s_mount_opt, RESERVATION);
 949                         break;
 950                 case Opt_noreservation:
 951                         clear_opt(sbi->s_mount_opt, RESERVATION);
 952                         break;
 953                 case Opt_journal_update:
 954                         /* @@@ FIXME */
 955                         /* Eventually we will want to be able to create
 956                            a journal file here.  For now, only allow the
 957                            user to specify an existing inode to be the
 958                            journal file. */
 959                         if (is_remount) {
 960                                 printk(KERN_ERR "EXT3-fs: cannot specify "
 961                                        "journal on remount\n");
 962                                 return 0;
 963                         }
 964                         set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
 965                         break;
 966                 case Opt_journal_inum:
 967                         if (is_remount) {
 968                                 printk(KERN_ERR "EXT3-fs: cannot specify "
 969                                        "journal on remount\n");
 970                                 return 0;
 971                         }
 972                         if (match_int(&args[0], &option))
 973                                 return 0;
 974                         *inum = option;
 975                         break;
 976                 case Opt_journal_dev:
 977                         if (is_remount) {
 978                                 printk(KERN_ERR "EXT3-fs: cannot specify "
 979                                        "journal on remount\n");
 980                                 return 0;
 981                         }
 982                         if (match_int(&args[0], &option))
 983                                 return 0;
 984                         *journal_devnum = option;
 985                         break;
 986                 case Opt_noload:
 987                         set_opt (sbi->s_mount_opt, NOLOAD);
 988                         break;
 989                 case Opt_commit:
 990                         if (match_int(&args[0], &option))
 991                                 return 0;
 992                         if (option < 0)
 993                                 return 0;
 994                         if (option == 0)
 995                                 option = JBD_DEFAULT_MAX_COMMIT_AGE;
 996                         sbi->s_commit_interval = HZ * option;
 997                         break;
 998                 case Opt_data_journal:
 999                         data_opt = EXT3_MOUNT_JOURNAL_DATA;
1000                         goto datacheck;
1001                 case Opt_data_ordered:
1002                         data_opt = EXT3_MOUNT_ORDERED_DATA;
1003                         goto datacheck;
1004                 case Opt_data_writeback:
1005                         data_opt = EXT3_MOUNT_WRITEBACK_DATA;
1006                 datacheck:
1007                         if (is_remount) {
1008                                 if ((sbi->s_mount_opt & EXT3_MOUNT_DATA_FLAGS)
1009                                                 != data_opt) {
1010                                         printk(KERN_ERR
1011                                                 "EXT3-fs: cannot change data "
1012                                                 "mode on remount\n");
1013                                         return 0;
1014                                 }
1015                         } else {
1016                                 sbi->s_mount_opt &= ~EXT3_MOUNT_DATA_FLAGS;
1017                                 sbi->s_mount_opt |= data_opt;
1018                         }
1019                         break;
1020                 case Opt_data_err_abort:
1021                         set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1022                         break;
1023                 case Opt_data_err_ignore:
1024                         clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1025                         break;
1026 #ifdef CONFIG_QUOTA
1027                 case Opt_usrjquota:
1028                         qtype = USRQUOTA;
1029                         goto set_qf_name;
1030                 case Opt_grpjquota:
1031                         qtype = GRPQUOTA;
1032 set_qf_name:
1033                         if ((sb_any_quota_enabled(sb) ||
1034                              sb_any_quota_suspended(sb)) &&
1035                             !sbi->s_qf_names[qtype]) {
1036                                 printk(KERN_ERR
1037                                         "EXT3-fs: Cannot change journaled "
1038                                         "quota options when quota turned on.\n");
1039                                 return 0;
1040                         }
1041                         qname = match_strdup(&args[0]);
1042                         if (!qname) {
1043                                 printk(KERN_ERR
1044                                         "EXT3-fs: not enough memory for "
1045                                         "storing quotafile name.\n");
1046                                 return 0;
1047                         }
1048                         if (sbi->s_qf_names[qtype] &&
1049                             strcmp(sbi->s_qf_names[qtype], qname)) {
1050                                 printk(KERN_ERR
1051                                         "EXT3-fs: %s quota file already "
1052                                         "specified.\n", QTYPE2NAME(qtype));
1053                                 kfree(qname);
1054                                 return 0;
1055                         }
1056                         sbi->s_qf_names[qtype] = qname;
1057                         if (strchr(sbi->s_qf_names[qtype], '/')) {
1058                                 printk(KERN_ERR
1059                                         "EXT3-fs: quotafile must be on "
1060                                         "filesystem root.\n");
1061                                 kfree(sbi->s_qf_names[qtype]);
1062                                 sbi->s_qf_names[qtype] = NULL;
1063                                 return 0;
1064                         }
1065                         set_opt(sbi->s_mount_opt, QUOTA);
1066                         break;
1067                 case Opt_offusrjquota:
1068                         qtype = USRQUOTA;
1069                         goto clear_qf_name;
1070                 case Opt_offgrpjquota:
1071                         qtype = GRPQUOTA;
1072 clear_qf_name:
1073                         if ((sb_any_quota_enabled(sb) ||
1074                              sb_any_quota_suspended(sb)) &&
1075                             sbi->s_qf_names[qtype]) {
1076                                 printk(KERN_ERR "EXT3-fs: Cannot change "
1077                                         "journaled quota options when "
1078                                         "quota turned on.\n");
1079                                 return 0;
1080                         }
1081                         /*
1082                          * The space will be released later when all options
1083                          * are confirmed to be correct
1084                          */
1085                         sbi->s_qf_names[qtype] = NULL;
1086                         break;
1087                 case Opt_jqfmt_vfsold:
1088                         qfmt = QFMT_VFS_OLD;
1089                         goto set_qf_format;
1090                 case Opt_jqfmt_vfsv0:
1091                         qfmt = QFMT_VFS_V0;
1092 set_qf_format:
1093                         if ((sb_any_quota_enabled(sb) ||
1094                              sb_any_quota_suspended(sb)) &&
1095                             sbi->s_jquota_fmt != qfmt) {
1096                                 printk(KERN_ERR "EXT3-fs: Cannot change "
1097                                         "journaled quota options when "
1098                                         "quota turned on.\n");
1099                                 return 0;
1100                         }
1101                         sbi->s_jquota_fmt = qfmt;
1102                         break;
1103                 case Opt_quota:
1104                 case Opt_usrquota:
1105                         set_opt(sbi->s_mount_opt, QUOTA);
1106                         set_opt(sbi->s_mount_opt, USRQUOTA);
1107                         break;
1108                 case Opt_grpquota:
1109                         set_opt(sbi->s_mount_opt, QUOTA);
1110                         set_opt(sbi->s_mount_opt, GRPQUOTA);
1111                         break;
1112                 case Opt_noquota:
1113                         if (sb_any_quota_enabled(sb) ||
1114                             sb_any_quota_suspended(sb)) {
1115                                 printk(KERN_ERR "EXT3-fs: Cannot change quota "
1116                                         "options when quota turned on.\n");
1117                                 return 0;
1118                         }
1119                         clear_opt(sbi->s_mount_opt, QUOTA);
1120                         clear_opt(sbi->s_mount_opt, USRQUOTA);
1121                         clear_opt(sbi->s_mount_opt, GRPQUOTA);
1122                         break;
1123 #else
1124                 case Opt_quota:
1125                 case Opt_usrquota:
1126                 case Opt_grpquota:
1127                         printk(KERN_ERR
1128                                 "EXT3-fs: quota options not supported.\n");
1129                         break;
1130                 case Opt_usrjquota:
1131                 case Opt_grpjquota:
1132                 case Opt_offusrjquota:
1133                 case Opt_offgrpjquota:
1134                 case Opt_jqfmt_vfsold:
1135                 case Opt_jqfmt_vfsv0:
1136                         printk(KERN_ERR
1137                                 "EXT3-fs: journaled quota options not "
1138                                 "supported.\n");
1139                         break;
1140                 case Opt_noquota:
1141                         break;
1142 #endif
1143                 case Opt_abort:
1144                         set_opt(sbi->s_mount_opt, ABORT);
1145                         break;
1146                 case Opt_barrier:
1147                         if (match_int(&args[0], &option))
1148                                 return 0;
1149                         if (option)
1150                                 set_opt(sbi->s_mount_opt, BARRIER);
1151                         else
1152                                 clear_opt(sbi->s_mount_opt, BARRIER);
1153                         break;
1154                 case Opt_ignore:
1155                         break;
1156                 case Opt_resize:
1157                         if (!is_remount) {
1158                                 printk("EXT3-fs: resize option only available "
1159                                         "for remount\n");
1160                                 return 0;
1161                         }
1162                         if (match_int(&args[0], &option) != 0)
1163                                 return 0;
1164                         *n_blocks_count = option;
1165                         break;
1166                 case Opt_nobh:
1167                         set_opt(sbi->s_mount_opt, NOBH);
1168                         break;
1169                 case Opt_bh:
1170                         clear_opt(sbi->s_mount_opt, NOBH);
1171                         break;
1172                 default:
1173                         printk (KERN_ERR
1174                                 "EXT3-fs: Unrecognized mount option \"%s\" "
1175                                 "or missing value\n", p);
1176                         return 0;
1177                 }
1178         }
1179 #ifdef CONFIG_QUOTA
1180         if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1181                 if ((sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA) &&
1182                      sbi->s_qf_names[USRQUOTA])
1183                         clear_opt(sbi->s_mount_opt, USRQUOTA);
1184
1185                 if ((sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA) &&
1186                      sbi->s_qf_names[GRPQUOTA])
1187                         clear_opt(sbi->s_mount_opt, GRPQUOTA);
1188
1189                 if ((sbi->s_qf_names[USRQUOTA] &&
1190                                 (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)) ||
1191                     (sbi->s_qf_names[GRPQUOTA] &&
1192                                 (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA))) {
1193                         printk(KERN_ERR "EXT3-fs: old and new quota "
1194                                         "format mixing.\n");
1195                         return 0;
1196                 }
1197
1198                 if (!sbi->s_jquota_fmt) {
1199                         printk(KERN_ERR "EXT3-fs: journaled quota format "
1200                                         "not specified.\n");
1201                         return 0;
1202                 }
1203         } else {
1204                 if (sbi->s_jquota_fmt) {
1205                         printk(KERN_ERR "EXT3-fs: journaled quota format "
1206                                         "specified with no journaling "
1207                                         "enabled.\n");
1208                         return 0;
1209                 }
1210         }
1211 #endif
1212         return 1;
1213 }
1214
1215 static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1216                             int read_only)
1217 {
1218         struct ext3_sb_info *sbi = EXT3_SB(sb);
1219         int res = 0;
1220
1221         if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
1222                 printk (KERN_ERR "EXT3-fs warning: revision level too high, "
1223                         "forcing read-only mode\n");
1224                 res = MS_RDONLY;
1225         }
1226         if (read_only)
1227                 return res;
1228         if (!(sbi->s_mount_state & EXT3_VALID_FS))
1229                 printk (KERN_WARNING "EXT3-fs warning: mounting unchecked fs, "
1230                         "running e2fsck is recommended\n");
1231         else if ((sbi->s_mount_state & EXT3_ERROR_FS))
1232                 printk (KERN_WARNING
1233                         "EXT3-fs warning: mounting fs with errors, "
1234                         "running e2fsck is recommended\n");
1235         else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1236                  le16_to_cpu(es->s_mnt_count) >=
1237                  (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1238                 printk (KERN_WARNING
1239                         "EXT3-fs warning: maximal mount count reached, "
1240                         "running e2fsck is recommended\n");
1241         else if (le32_to_cpu(es->s_checkinterval) &&
1242                 (le32_to_cpu(es->s_lastcheck) +
1243                         le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1244                 printk (KERN_WARNING
1245                         "EXT3-fs warning: checktime reached, "
1246                         "running e2fsck is recommended\n");
1247 #if 0
1248                 /* @@@ We _will_ want to clear the valid bit if we find
1249                    inconsistencies, to force a fsck at reboot.  But for
1250                    a plain journaled filesystem we can keep it set as
1251                    valid forever! :) */
1252         es->s_state &= cpu_to_le16(~EXT3_VALID_FS);
1253 #endif
1254         if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1255                 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
1256         le16_add_cpu(&es->s_mnt_count, 1);
1257         es->s_mtime = cpu_to_le32(get_seconds());
1258         ext3_update_dynamic_rev(sb);
1259         EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1260
1261         ext3_commit_super(sb, es, 1);
1262         if (test_opt(sb, DEBUG))
1263                 printk(KERN_INFO "[EXT3 FS bs=%lu, gc=%lu, "
1264                                 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1265                         sb->s_blocksize,
1266                         sbi->s_groups_count,
1267                         EXT3_BLOCKS_PER_GROUP(sb),
1268                         EXT3_INODES_PER_GROUP(sb),
1269                         sbi->s_mount_opt);
1270
1271         printk(KERN_INFO "EXT3 FS on %s, ", sb->s_id);
1272         if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1273                 char b[BDEVNAME_SIZE];
1274
1275                 printk("external journal on %s\n",
1276                         bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1277         } else {
1278                 printk("internal journal\n");
1279         }
1280         return res;
1281 }
1282
1283 /* Called at mount-time, super-block is locked */
1284 static int ext3_check_descriptors(struct super_block *sb)
1285 {
1286         struct ext3_sb_info *sbi = EXT3_SB(sb);
1287         int i;
1288
1289         ext3_debug ("Checking group descriptors");
1290
1291         for (i = 0; i < sbi->s_groups_count; i++) {
1292                 struct ext3_group_desc *gdp = ext3_get_group_desc(sb, i, NULL);
1293                 ext3_fsblk_t first_block = ext3_group_first_block_no(sb, i);
1294                 ext3_fsblk_t last_block;
1295
1296                 if (i == sbi->s_groups_count - 1)
1297                         last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
1298                 else
1299                         last_block = first_block +
1300                                 (EXT3_BLOCKS_PER_GROUP(sb) - 1);
1301
1302                 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
1303                     le32_to_cpu(gdp->bg_block_bitmap) > last_block)
1304                 {
1305                         ext3_error (sb, "ext3_check_descriptors",
1306                                     "Block bitmap for group %d"
1307                                     " not in group (block %lu)!",
1308                                     i, (unsigned long)
1309                                         le32_to_cpu(gdp->bg_block_bitmap));
1310                         return 0;
1311                 }
1312                 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
1313                     le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
1314                 {
1315                         ext3_error (sb, "ext3_check_descriptors",
1316                                     "Inode bitmap for group %d"
1317                                     " not in group (block %lu)!",
1318                                     i, (unsigned long)
1319                                         le32_to_cpu(gdp->bg_inode_bitmap));
1320                         return 0;
1321                 }
1322                 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
1323                     le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
1324                     last_block)
1325                 {
1326                         ext3_error (sb, "ext3_check_descriptors",
1327                                     "Inode table for group %d"
1328                                     " not in group (block %lu)!",
1329                                     i, (unsigned long)
1330                                         le32_to_cpu(gdp->bg_inode_table));
1331                         return 0;
1332                 }
1333         }
1334
1335         sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1336         sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1337         return 1;
1338 }
1339
1340
1341 /* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1342  * the superblock) which were deleted from all directories, but held open by
1343  * a process at the time of a crash.  We walk the list and try to delete these
1344  * inodes at recovery time (only with a read-write filesystem).
1345  *
1346  * In order to keep the orphan inode chain consistent during traversal (in
1347  * case of crash during recovery), we link each inode into the superblock
1348  * orphan list_head and handle it the same way as an inode deletion during
1349  * normal operation (which journals the operations for us).
1350  *
1351  * We only do an iget() and an iput() on each inode, which is very safe if we
1352  * accidentally point at an in-use or already deleted inode.  The worst that
1353  * can happen in this case is that we get a "bit already cleared" message from
1354  * ext3_free_inode().  The only reason we would point at a wrong inode is if
1355  * e2fsck was run on this filesystem, and it must have already done the orphan
1356  * inode cleanup for us, so we can safely abort without any further action.
1357  */
1358 static void ext3_orphan_cleanup (struct super_block * sb,
1359                                  struct ext3_super_block * es)
1360 {
1361         unsigned int s_flags = sb->s_flags;
1362         int nr_orphans = 0, nr_truncates = 0;
1363 #ifdef CONFIG_QUOTA
1364         int i;
1365 #endif
1366         if (!es->s_last_orphan) {
1367                 jbd_debug(4, "no orphan inodes to clean up\n");
1368                 return;
1369         }
1370
1371         if (bdev_read_only(sb->s_bdev)) {
1372                 printk(KERN_ERR "EXT3-fs: write access "
1373                         "unavailable, skipping orphan cleanup.\n");
1374                 return;
1375         }
1376
1377         if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1378                 if (es->s_last_orphan)
1379                         jbd_debug(1, "Errors on filesystem, "
1380                                   "clearing orphan list.\n");
1381                 es->s_last_orphan = 0;
1382                 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1383                 return;
1384         }
1385
1386         if (s_flags & MS_RDONLY) {
1387                 printk(KERN_INFO "EXT3-fs: %s: orphan cleanup on readonly fs\n",
1388                        sb->s_id);
1389                 sb->s_flags &= ~MS_RDONLY;
1390         }
1391 #ifdef CONFIG_QUOTA
1392         /* Needed for iput() to work correctly and not trash data */
1393         sb->s_flags |= MS_ACTIVE;
1394         /* Turn on quotas so that they are updated correctly */
1395         for (i = 0; i < MAXQUOTAS; i++) {
1396                 if (EXT3_SB(sb)->s_qf_names[i]) {
1397                         int ret = ext3_quota_on_mount(sb, i);
1398                         if (ret < 0)
1399                                 printk(KERN_ERR
1400                                         "EXT3-fs: Cannot turn on journaled "
1401                                         "quota: error %d\n", ret);
1402                 }
1403         }
1404 #endif
1405
1406         while (es->s_last_orphan) {
1407                 struct inode *inode;
1408
1409                 inode = ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1410                 if (IS_ERR(inode)) {
1411                         es->s_last_orphan = 0;
1412                         break;
1413                 }
1414
1415                 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1416                 DQUOT_INIT(inode);
1417                 if (inode->i_nlink) {
1418                         printk(KERN_DEBUG
1419                                 "%s: truncating inode %lu to %Ld bytes\n",
1420                                 __func__, inode->i_ino, inode->i_size);
1421                         jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1422                                   inode->i_ino, inode->i_size);
1423                         ext3_truncate(inode);
1424                         nr_truncates++;
1425                 } else {
1426                         printk(KERN_DEBUG
1427                                 "%s: deleting unreferenced inode %lu\n",
1428                                 __func__, inode->i_ino);
1429                         jbd_debug(2, "deleting unreferenced inode %lu\n",
1430                                   inode->i_ino);
1431                         nr_orphans++;
1432                 }
1433                 iput(inode);  /* The delete magic happens here! */
1434         }
1435
1436 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1437
1438         if (nr_orphans)
1439                 printk(KERN_INFO "EXT3-fs: %s: %d orphan inode%s deleted\n",
1440                        sb->s_id, PLURAL(nr_orphans));
1441         if (nr_truncates)
1442                 printk(KERN_INFO "EXT3-fs: %s: %d truncate%s cleaned up\n",
1443                        sb->s_id, PLURAL(nr_truncates));
1444 #ifdef CONFIG_QUOTA
1445         /* Turn quotas off */
1446         for (i = 0; i < MAXQUOTAS; i++) {
1447                 if (sb_dqopt(sb)->files[i])
1448                         vfs_quota_off(sb, i, 0);
1449         }
1450 #endif
1451         sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1452 }
1453
1454 /*
1455  * Maximal file size.  There is a direct, and {,double-,triple-}indirect
1456  * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1457  * We need to be 1 filesystem block less than the 2^32 sector limit.
1458  */
1459 static loff_t ext3_max_size(int bits)
1460 {
1461         loff_t res = EXT3_NDIR_BLOCKS;
1462         int meta_blocks;
1463         loff_t upper_limit;
1464
1465         /* This is calculated to be the largest file size for a
1466          * dense, file such that the total number of
1467          * sectors in the file, including data and all indirect blocks,
1468          * does not exceed 2^32 -1
1469          * __u32 i_blocks representing the total number of
1470          * 512 bytes blocks of the file
1471          */
1472         upper_limit = (1LL << 32) - 1;
1473
1474         /* total blocks in file system block size */
1475         upper_limit >>= (bits - 9);
1476
1477
1478         /* indirect blocks */
1479         meta_blocks = 1;
1480         /* double indirect blocks */
1481         meta_blocks += 1 + (1LL << (bits-2));
1482         /* tripple indirect blocks */
1483         meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1484
1485         upper_limit -= meta_blocks;
1486         upper_limit <<= bits;
1487
1488         res += 1LL << (bits-2);
1489         res += 1LL << (2*(bits-2));
1490         res += 1LL << (3*(bits-2));
1491         res <<= bits;
1492         if (res > upper_limit)
1493                 res = upper_limit;
1494
1495         if (res > MAX_LFS_FILESIZE)
1496                 res = MAX_LFS_FILESIZE;
1497
1498         return res;
1499 }
1500
1501 static ext3_fsblk_t descriptor_loc(struct super_block *sb,
1502                                     ext3_fsblk_t logic_sb_block,
1503                                     int nr)
1504 {
1505         struct ext3_sb_info *sbi = EXT3_SB(sb);
1506         unsigned long bg, first_meta_bg;
1507         int has_super = 0;
1508
1509         first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1510
1511         if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1512             nr < first_meta_bg)
1513                 return (logic_sb_block + nr + 1);
1514         bg = sbi->s_desc_per_block * nr;
1515         if (ext3_bg_has_super(sb, bg))
1516                 has_super = 1;
1517         return (has_super + ext3_group_first_block_no(sb, bg));
1518 }
1519
1520
1521 static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1522 {
1523         struct buffer_head * bh;
1524         struct ext3_super_block *es = NULL;
1525         struct ext3_sb_info *sbi;
1526         ext3_fsblk_t block;
1527         ext3_fsblk_t sb_block = get_sb_block(&data);
1528         ext3_fsblk_t logic_sb_block;
1529         unsigned long offset = 0;
1530         unsigned int journal_inum = 0;
1531         unsigned long journal_devnum = 0;
1532         unsigned long def_mount_opts;
1533         struct inode *root;
1534         int blocksize;
1535         int hblock;
1536         int db_count;
1537         int i;
1538         int needs_recovery;
1539         int ret = -EINVAL;
1540         __le32 features;
1541         int err;
1542
1543         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1544         if (!sbi)
1545                 return -ENOMEM;
1546         sb->s_fs_info = sbi;
1547         sbi->s_mount_opt = 0;
1548         sbi->s_resuid = EXT3_DEF_RESUID;
1549         sbi->s_resgid = EXT3_DEF_RESGID;
1550         sbi->s_sb_block = sb_block;
1551
1552         unlock_kernel();
1553
1554         blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1555         if (!blocksize) {
1556                 printk(KERN_ERR "EXT3-fs: unable to set blocksize\n");
1557                 goto out_fail;
1558         }
1559
1560         /*
1561          * The ext3 superblock will not be buffer aligned for other than 1kB
1562          * block sizes.  We need to calculate the offset from buffer start.
1563          */
1564         if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1565                 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1566                 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1567         } else {
1568                 logic_sb_block = sb_block;
1569         }
1570
1571         if (!(bh = sb_bread(sb, logic_sb_block))) {
1572                 printk (KERN_ERR "EXT3-fs: unable to read superblock\n");
1573                 goto out_fail;
1574         }
1575         /*
1576          * Note: s_es must be initialized as soon as possible because
1577          *       some ext3 macro-instructions depend on its value
1578          */
1579         es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1580         sbi->s_es = es;
1581         sb->s_magic = le16_to_cpu(es->s_magic);
1582         if (sb->s_magic != EXT3_SUPER_MAGIC)
1583                 goto cantfind_ext3;
1584
1585         /* Set defaults before we parse the mount options */
1586         def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1587         if (def_mount_opts & EXT3_DEFM_DEBUG)
1588                 set_opt(sbi->s_mount_opt, DEBUG);
1589         if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1590                 set_opt(sbi->s_mount_opt, GRPID);
1591         if (def_mount_opts & EXT3_DEFM_UID16)
1592                 set_opt(sbi->s_mount_opt, NO_UID32);
1593 #ifdef CONFIG_EXT3_FS_XATTR
1594         if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1595                 set_opt(sbi->s_mount_opt, XATTR_USER);
1596 #endif
1597 #ifdef CONFIG_EXT3_FS_POSIX_ACL
1598         if (def_mount_opts & EXT3_DEFM_ACL)
1599                 set_opt(sbi->s_mount_opt, POSIX_ACL);
1600 #endif
1601         if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1602                 sbi->s_mount_opt |= EXT3_MOUNT_JOURNAL_DATA;
1603         else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1604                 sbi->s_mount_opt |= EXT3_MOUNT_ORDERED_DATA;
1605         else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1606                 sbi->s_mount_opt |= EXT3_MOUNT_WRITEBACK_DATA;
1607
1608         if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1609                 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1610         else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_CONTINUE)
1611                 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1612         else
1613                 set_opt(sbi->s_mount_opt, ERRORS_RO);
1614
1615         sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1616         sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1617
1618         set_opt(sbi->s_mount_opt, RESERVATION);
1619
1620         if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1621                             NULL, 0))
1622                 goto failed_mount;
1623
1624         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1625                 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1626
1627         if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1628             (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1629              EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1630              EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1631                 printk(KERN_WARNING
1632                        "EXT3-fs warning: feature flags set on rev 0 fs, "
1633                        "running e2fsck is recommended\n");
1634         /*
1635          * Check feature flags regardless of the revision level, since we
1636          * previously didn't change the revision level when setting the flags,
1637          * so there is a chance incompat flags are set on a rev 0 filesystem.
1638          */
1639         features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1640         if (features) {
1641                 printk(KERN_ERR "EXT3-fs: %s: couldn't mount because of "
1642                        "unsupported optional features (%x).\n",
1643                        sb->s_id, le32_to_cpu(features));
1644                 goto failed_mount;
1645         }
1646         features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1647         if (!(sb->s_flags & MS_RDONLY) && features) {
1648                 printk(KERN_ERR "EXT3-fs: %s: couldn't mount RDWR because of "
1649                        "unsupported optional features (%x).\n",
1650                        sb->s_id, le32_to_cpu(features));
1651                 goto failed_mount;
1652         }
1653         blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1654
1655         if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1656             blocksize > EXT3_MAX_BLOCK_SIZE) {
1657                 printk(KERN_ERR
1658                        "EXT3-fs: Unsupported filesystem blocksize %d on %s.\n",
1659                        blocksize, sb->s_id);
1660                 goto failed_mount;
1661         }
1662
1663         hblock = bdev_hardsect_size(sb->s_bdev);
1664         if (sb->s_blocksize != blocksize) {
1665                 /*
1666                  * Make sure the blocksize for the filesystem is larger
1667                  * than the hardware sectorsize for the machine.
1668                  */
1669                 if (blocksize < hblock) {
1670                         printk(KERN_ERR "EXT3-fs: blocksize %d too small for "
1671                                "device blocksize %d.\n", blocksize, hblock);
1672                         goto failed_mount;
1673                 }
1674
1675                 brelse (bh);
1676                 if (!sb_set_blocksize(sb, blocksize)) {
1677                         printk(KERN_ERR "EXT3-fs: bad blocksize %d.\n",
1678                                 blocksize);
1679                         goto out_fail;
1680                 }
1681                 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1682                 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1683                 bh = sb_bread(sb, logic_sb_block);
1684                 if (!bh) {
1685                         printk(KERN_ERR
1686                                "EXT3-fs: Can't read superblock on 2nd try.\n");
1687                         goto failed_mount;
1688                 }
1689                 es = (struct ext3_super_block *)(((char *)bh->b_data) + offset);
1690                 sbi->s_es = es;
1691                 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
1692                         printk (KERN_ERR
1693                                 "EXT3-fs: Magic mismatch, very weird !\n");
1694                         goto failed_mount;
1695                 }
1696         }
1697
1698         sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1699
1700         if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1701                 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1702                 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1703         } else {
1704                 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1705                 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1706                 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
1707                     (!is_power_of_2(sbi->s_inode_size)) ||
1708                     (sbi->s_inode_size > blocksize)) {
1709                         printk (KERN_ERR
1710                                 "EXT3-fs: unsupported inode size: %d\n",
1711                                 sbi->s_inode_size);
1712                         goto failed_mount;
1713                 }
1714         }
1715         sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1716                                    le32_to_cpu(es->s_log_frag_size);
1717         if (blocksize != sbi->s_frag_size) {
1718                 printk(KERN_ERR
1719                        "EXT3-fs: fragsize %lu != blocksize %u (unsupported)\n",
1720                        sbi->s_frag_size, blocksize);
1721                 goto failed_mount;
1722         }
1723         sbi->s_frags_per_block = 1;
1724         sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1725         sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1726         sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1727         if (EXT3_INODE_SIZE(sb) == 0 || EXT3_INODES_PER_GROUP(sb) == 0)
1728                 goto cantfind_ext3;
1729         sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1730         if (sbi->s_inodes_per_block == 0)
1731                 goto cantfind_ext3;
1732         sbi->s_itb_per_group = sbi->s_inodes_per_group /
1733                                         sbi->s_inodes_per_block;
1734         sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1735         sbi->s_sbh = bh;
1736         sbi->s_mount_state = le16_to_cpu(es->s_state);
1737         sbi->s_addr_per_block_bits = ilog2(EXT3_ADDR_PER_BLOCK(sb));
1738         sbi->s_desc_per_block_bits = ilog2(EXT3_DESC_PER_BLOCK(sb));
1739         for (i=0; i < 4; i++)
1740                 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1741         sbi->s_def_hash_version = es->s_def_hash_version;
1742
1743         if (sbi->s_blocks_per_group > blocksize * 8) {
1744                 printk (KERN_ERR
1745                         "EXT3-fs: #blocks per group too big: %lu\n",
1746                         sbi->s_blocks_per_group);
1747                 goto failed_mount;
1748         }
1749         if (sbi->s_frags_per_group > blocksize * 8) {
1750                 printk (KERN_ERR
1751                         "EXT3-fs: #fragments per group too big: %lu\n",
1752                         sbi->s_frags_per_group);
1753                 goto failed_mount;
1754         }
1755         if (sbi->s_inodes_per_group > blocksize * 8) {
1756                 printk (KERN_ERR
1757                         "EXT3-fs: #inodes per group too big: %lu\n",
1758                         sbi->s_inodes_per_group);
1759                 goto failed_mount;
1760         }
1761
1762         if (le32_to_cpu(es->s_blocks_count) >
1763                     (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
1764                 printk(KERN_ERR "EXT3-fs: filesystem on %s:"
1765                         " too large to mount safely\n", sb->s_id);
1766                 if (sizeof(sector_t) < 8)
1767                         printk(KERN_WARNING "EXT3-fs: CONFIG_LBD not "
1768                                         "enabled\n");
1769                 goto failed_mount;
1770         }
1771
1772         if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1773                 goto cantfind_ext3;
1774         sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1775                                le32_to_cpu(es->s_first_data_block) - 1)
1776                                        / EXT3_BLOCKS_PER_GROUP(sb)) + 1;
1777         db_count = (sbi->s_groups_count + EXT3_DESC_PER_BLOCK(sb) - 1) /
1778                    EXT3_DESC_PER_BLOCK(sb);
1779         sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1780                                     GFP_KERNEL);
1781         if (sbi->s_group_desc == NULL) {
1782                 printk (KERN_ERR "EXT3-fs: not enough memory\n");
1783                 goto failed_mount;
1784         }
1785
1786         bgl_lock_init(&sbi->s_blockgroup_lock);
1787
1788         for (i = 0; i < db_count; i++) {
1789                 block = descriptor_loc(sb, logic_sb_block, i);
1790                 sbi->s_group_desc[i] = sb_bread(sb, block);
1791                 if (!sbi->s_group_desc[i]) {
1792                         printk (KERN_ERR "EXT3-fs: "
1793                                 "can't read group descriptor %d\n", i);
1794                         db_count = i;
1795                         goto failed_mount2;
1796                 }
1797         }
1798         if (!ext3_check_descriptors (sb)) {
1799                 printk(KERN_ERR "EXT3-fs: group descriptors corrupted!\n");
1800                 goto failed_mount2;
1801         }
1802         sbi->s_gdb_count = db_count;
1803         get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1804         spin_lock_init(&sbi->s_next_gen_lock);
1805
1806         err = percpu_counter_init(&sbi->s_freeblocks_counter,
1807                         ext3_count_free_blocks(sb));
1808         if (!err) {
1809                 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1810                                 ext3_count_free_inodes(sb));
1811         }
1812         if (!err) {
1813                 err = percpu_counter_init(&sbi->s_dirs_counter,
1814                                 ext3_count_dirs(sb));
1815         }
1816         if (err) {
1817                 printk(KERN_ERR "EXT3-fs: insufficient memory\n");
1818                 goto failed_mount3;
1819         }
1820
1821         /* per fileystem reservation list head & lock */
1822         spin_lock_init(&sbi->s_rsv_window_lock);
1823         sbi->s_rsv_window_root = RB_ROOT;
1824         /* Add a single, static dummy reservation to the start of the
1825          * reservation window list --- it gives us a placeholder for
1826          * append-at-start-of-list which makes the allocation logic
1827          * _much_ simpler. */
1828         sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1829         sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1830         sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1831         sbi->s_rsv_window_head.rsv_goal_size = 0;
1832         ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1833
1834         /*
1835          * set up enough so that it can read an inode
1836          */
1837         sb->s_op = &ext3_sops;
1838         sb->s_export_op = &ext3_export_ops;
1839         sb->s_xattr = ext3_xattr_handlers;
1840 #ifdef CONFIG_QUOTA
1841         sb->s_qcop = &ext3_qctl_operations;
1842         sb->dq_op = &ext3_quota_operations;
1843 #endif
1844         INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1845
1846         sb->s_root = NULL;
1847
1848         needs_recovery = (es->s_last_orphan != 0 ||
1849                           EXT3_HAS_INCOMPAT_FEATURE(sb,
1850                                     EXT3_FEATURE_INCOMPAT_RECOVER));
1851
1852         /*
1853          * The first inode we look at is the journal inode.  Don't try
1854          * root first: it may be modified in the journal!
1855          */
1856         if (!test_opt(sb, NOLOAD) &&
1857             EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
1858                 if (ext3_load_journal(sb, es, journal_devnum))
1859                         goto failed_mount3;
1860         } else if (journal_inum) {
1861                 if (ext3_create_journal(sb, es, journal_inum))
1862                         goto failed_mount3;
1863         } else {
1864                 if (!silent)
1865                         printk (KERN_ERR
1866                                 "ext3: No journal on filesystem on %s\n",
1867                                 sb->s_id);
1868                 goto failed_mount3;
1869         }
1870
1871         /* We have now updated the journal if required, so we can
1872          * validate the data journaling mode. */
1873         switch (test_opt(sb, DATA_FLAGS)) {
1874         case 0:
1875                 /* No mode set, assume a default based on the journal
1876                    capabilities: ORDERED_DATA if the journal can
1877                    cope, else JOURNAL_DATA */
1878                 if (journal_check_available_features
1879                     (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
1880                         set_opt(sbi->s_mount_opt, ORDERED_DATA);
1881                 else
1882                         set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1883                 break;
1884
1885         case EXT3_MOUNT_ORDERED_DATA:
1886         case EXT3_MOUNT_WRITEBACK_DATA:
1887                 if (!journal_check_available_features
1888                     (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
1889                         printk(KERN_ERR "EXT3-fs: Journal does not support "
1890                                "requested data journaling mode\n");
1891                         goto failed_mount4;
1892                 }
1893         default:
1894                 break;
1895         }
1896
1897         if (test_opt(sb, NOBH)) {
1898                 if (!(test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)) {
1899                         printk(KERN_WARNING "EXT3-fs: Ignoring nobh option - "
1900                                 "its supported only with writeback mode\n");
1901                         clear_opt(sbi->s_mount_opt, NOBH);
1902                 }
1903         }
1904         /*
1905          * The journal_load will have done any necessary log recovery,
1906          * so we can safely mount the rest of the filesystem now.
1907          */
1908
1909         root = ext3_iget(sb, EXT3_ROOT_INO);
1910         if (IS_ERR(root)) {
1911                 printk(KERN_ERR "EXT3-fs: get root inode failed\n");
1912                 ret = PTR_ERR(root);
1913                 goto failed_mount4;
1914         }
1915         if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1916                 iput(root);
1917                 printk(KERN_ERR "EXT3-fs: corrupt root inode, run e2fsck\n");
1918                 goto failed_mount4;
1919         }
1920         sb->s_root = d_alloc_root(root);
1921         if (!sb->s_root) {
1922                 printk(KERN_ERR "EXT3-fs: get root dentry failed\n");
1923                 iput(root);
1924                 ret = -ENOMEM;
1925                 goto failed_mount4;
1926         }
1927
1928         ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
1929         /*
1930          * akpm: core read_super() calls in here with the superblock locked.
1931          * That deadlocks, because orphan cleanup needs to lock the superblock
1932          * in numerous places.  Here we just pop the lock - it's relatively
1933          * harmless, because we are now ready to accept write_super() requests,
1934          * and aviro says that's the only reason for hanging onto the
1935          * superblock lock.
1936          */
1937         EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
1938         ext3_orphan_cleanup(sb, es);
1939         EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
1940         if (needs_recovery)
1941                 printk (KERN_INFO "EXT3-fs: recovery complete.\n");
1942         ext3_mark_recovery_complete(sb, es);
1943         printk (KERN_INFO "EXT3-fs: mounted filesystem with %s data mode.\n",
1944                 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
1945                 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
1946                 "writeback");
1947
1948         lock_kernel();
1949         return 0;
1950
1951 cantfind_ext3:
1952         if (!silent)
1953                 printk(KERN_ERR "VFS: Can't find ext3 filesystem on dev %s.\n",
1954                        sb->s_id);
1955         goto failed_mount;
1956
1957 failed_mount4:
1958         journal_destroy(sbi->s_journal);
1959 failed_mount3:
1960         percpu_counter_destroy(&sbi->s_freeblocks_counter);
1961         percpu_counter_destroy(&sbi->s_freeinodes_counter);
1962         percpu_counter_destroy(&sbi->s_dirs_counter);
1963 failed_mount2:
1964         for (i = 0; i < db_count; i++)
1965                 brelse(sbi->s_group_desc[i]);
1966         kfree(sbi->s_group_desc);
1967 failed_mount:
1968 #ifdef CONFIG_QUOTA
1969         for (i = 0; i < MAXQUOTAS; i++)
1970                 kfree(sbi->s_qf_names[i]);
1971 #endif
1972         ext3_blkdev_remove(sbi);
1973         brelse(bh);
1974 out_fail:
1975         sb->s_fs_info = NULL;
1976         kfree(sbi);
1977         lock_kernel();
1978         return ret;
1979 }
1980
1981 /*
1982  * Setup any per-fs journal parameters now.  We'll do this both on
1983  * initial mount, once the journal has been initialised but before we've
1984  * done any recovery; and again on any subsequent remount.
1985  */
1986 static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
1987 {
1988         struct ext3_sb_info *sbi = EXT3_SB(sb);
1989
1990         if (sbi->s_commit_interval)
1991                 journal->j_commit_interval = sbi->s_commit_interval;
1992         /* We could also set up an ext3-specific default for the commit
1993          * interval here, but for now we'll just fall back to the jbd
1994          * default. */
1995
1996         spin_lock(&journal->j_state_lock);
1997         if (test_opt(sb, BARRIER))
1998                 journal->j_flags |= JFS_BARRIER;
1999         else
2000                 journal->j_flags &= ~JFS_BARRIER;
2001         if (test_opt(sb, DATA_ERR_ABORT))
2002                 journal->j_flags |= JFS_ABORT_ON_SYNCDATA_ERR;
2003         else
2004                 journal->j_flags &= ~JFS_ABORT_ON_SYNCDATA_ERR;
2005         spin_unlock(&journal->j_state_lock);
2006 }
2007
2008 static journal_t *ext3_get_journal(struct super_block *sb,
2009                                    unsigned int journal_inum)
2010 {
2011         struct inode *journal_inode;
2012         journal_t *journal;
2013
2014         /* First, test for the existence of a valid inode on disk.  Bad
2015          * things happen if we iget() an unused inode, as the subsequent
2016          * iput() will try to delete it. */
2017
2018         journal_inode = ext3_iget(sb, journal_inum);
2019         if (IS_ERR(journal_inode)) {
2020                 printk(KERN_ERR "EXT3-fs: no journal found.\n");
2021                 return NULL;
2022         }
2023         if (!journal_inode->i_nlink) {
2024                 make_bad_inode(journal_inode);
2025                 iput(journal_inode);
2026                 printk(KERN_ERR "EXT3-fs: journal inode is deleted.\n");
2027                 return NULL;
2028         }
2029
2030         jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2031                   journal_inode, journal_inode->i_size);
2032         if (!S_ISREG(journal_inode->i_mode)) {
2033                 printk(KERN_ERR "EXT3-fs: invalid journal inode.\n");
2034                 iput(journal_inode);
2035                 return NULL;
2036         }
2037
2038         journal = journal_init_inode(journal_inode);
2039         if (!journal) {
2040                 printk(KERN_ERR "EXT3-fs: Could not load journal inode\n");
2041                 iput(journal_inode);
2042                 return NULL;
2043         }
2044         journal->j_private = sb;
2045         ext3_init_journal_params(sb, journal);
2046         return journal;
2047 }
2048
2049 static journal_t *ext3_get_dev_journal(struct super_block *sb,
2050                                        dev_t j_dev)
2051 {
2052         struct buffer_head * bh;
2053         journal_t *journal;
2054         ext3_fsblk_t start;
2055         ext3_fsblk_t len;
2056         int hblock, blocksize;
2057         ext3_fsblk_t sb_block;
2058         unsigned long offset;
2059         struct ext3_super_block * es;
2060         struct block_device *bdev;
2061
2062         bdev = ext3_blkdev_get(j_dev);
2063         if (bdev == NULL)
2064                 return NULL;
2065
2066         if (bd_claim(bdev, sb)) {
2067                 printk(KERN_ERR
2068                         "EXT3: failed to claim external journal device.\n");
2069                 blkdev_put(bdev);
2070                 return NULL;
2071         }
2072
2073         blocksize = sb->s_blocksize;
2074         hblock = bdev_hardsect_size(bdev);
2075         if (blocksize < hblock) {
2076                 printk(KERN_ERR
2077                         "EXT3-fs: blocksize too small for journal device.\n");
2078                 goto out_bdev;
2079         }
2080
2081         sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
2082         offset = EXT3_MIN_BLOCK_SIZE % blocksize;
2083         set_blocksize(bdev, blocksize);
2084         if (!(bh = __bread(bdev, sb_block, blocksize))) {
2085                 printk(KERN_ERR "EXT3-fs: couldn't read superblock of "
2086                        "external journal\n");
2087                 goto out_bdev;
2088         }
2089
2090         es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
2091         if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
2092             !(le32_to_cpu(es->s_feature_incompat) &
2093               EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2094                 printk(KERN_ERR "EXT3-fs: external journal has "
2095                                         "bad superblock\n");
2096                 brelse(bh);
2097                 goto out_bdev;
2098         }
2099
2100         if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2101                 printk(KERN_ERR "EXT3-fs: journal UUID does not match\n");
2102                 brelse(bh);
2103                 goto out_bdev;
2104         }
2105
2106         len = le32_to_cpu(es->s_blocks_count);
2107         start = sb_block + 1;
2108         brelse(bh);     /* we're done with the superblock */
2109
2110         journal = journal_init_dev(bdev, sb->s_bdev,
2111                                         start, len, blocksize);
2112         if (!journal) {
2113                 printk(KERN_ERR "EXT3-fs: failed to create device journal\n");
2114                 goto out_bdev;
2115         }
2116         journal->j_private = sb;
2117         ll_rw_block(READ, 1, &journal->j_sb_buffer);
2118         wait_on_buffer(journal->j_sb_buffer);
2119         if (!buffer_uptodate(journal->j_sb_buffer)) {
2120                 printk(KERN_ERR "EXT3-fs: I/O error on journal device\n");
2121                 goto out_journal;
2122         }
2123         if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
2124                 printk(KERN_ERR "EXT3-fs: External journal has more than one "
2125                                         "user (unsupported) - %d\n",
2126                         be32_to_cpu(journal->j_superblock->s_nr_users));
2127                 goto out_journal;
2128         }
2129         EXT3_SB(sb)->journal_bdev = bdev;
2130         ext3_init_journal_params(sb, journal);
2131         return journal;
2132 out_journal:
2133         journal_destroy(journal);
2134 out_bdev:
2135         ext3_blkdev_put(bdev);
2136         return NULL;
2137 }
2138
2139 static int ext3_load_journal(struct super_block *sb,
2140                              struct ext3_super_block *es,
2141                              unsigned long journal_devnum)
2142 {
2143         journal_t *journal;
2144         unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2145         dev_t journal_dev;
2146         int err = 0;
2147         int really_read_only;
2148
2149         if (journal_devnum &&
2150             journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2151                 printk(KERN_INFO "EXT3-fs: external journal device major/minor "
2152                         "numbers have changed\n");
2153                 journal_dev = new_decode_dev(journal_devnum);
2154         } else
2155                 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2156
2157         really_read_only = bdev_read_only(sb->s_bdev);
2158
2159         /*
2160          * Are we loading a blank journal or performing recovery after a
2161          * crash?  For recovery, we need to check in advance whether we
2162          * can get read-write access to the device.
2163          */
2164
2165         if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
2166                 if (sb->s_flags & MS_RDONLY) {
2167                         printk(KERN_INFO "EXT3-fs: INFO: recovery "
2168                                         "required on readonly filesystem.\n");
2169                         if (really_read_only) {
2170                                 printk(KERN_ERR "EXT3-fs: write access "
2171                                         "unavailable, cannot proceed.\n");
2172                                 return -EROFS;
2173                         }
2174                         printk (KERN_INFO "EXT3-fs: write access will "
2175                                         "be enabled during recovery.\n");
2176                 }
2177         }
2178
2179         if (journal_inum && journal_dev) {
2180                 printk(KERN_ERR "EXT3-fs: filesystem has both journal "
2181                        "and inode journals!\n");
2182                 return -EINVAL;
2183         }
2184
2185         if (journal_inum) {
2186                 if (!(journal = ext3_get_journal(sb, journal_inum)))
2187                         return -EINVAL;
2188         } else {
2189                 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
2190                         return -EINVAL;
2191         }
2192
2193         if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2194                 err = journal_update_format(journal);
2195                 if (err)  {
2196                         printk(KERN_ERR "EXT3-fs: error updating journal.\n");
2197                         journal_destroy(journal);
2198                         return err;
2199                 }
2200         }
2201
2202         if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
2203                 err = journal_wipe(journal, !really_read_only);
2204         if (!err)
2205                 err = journal_load(journal);
2206
2207         if (err) {
2208                 printk(KERN_ERR "EXT3-fs: error loading journal.\n");
2209                 journal_destroy(journal);
2210                 return err;
2211         }
2212
2213         EXT3_SB(sb)->s_journal = journal;
2214         ext3_clear_journal_err(sb, es);
2215
2216         if (journal_devnum &&
2217             journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2218                 es->s_journal_dev = cpu_to_le32(journal_devnum);
2219                 sb->s_dirt = 1;
2220
2221                 /* Make sure we flush the recovery flag to disk. */
2222                 ext3_commit_super(sb, es, 1);
2223         }
2224
2225         return 0;
2226 }
2227
2228 static int ext3_create_journal(struct super_block * sb,
2229                                struct ext3_super_block * es,
2230                                unsigned int journal_inum)
2231 {
2232         journal_t *journal;
2233         int err;
2234
2235         if (sb->s_flags & MS_RDONLY) {
2236                 printk(KERN_ERR "EXT3-fs: readonly filesystem when trying to "
2237                                 "create journal.\n");
2238                 return -EROFS;
2239         }
2240
2241         journal = ext3_get_journal(sb, journal_inum);
2242         if (!journal)
2243                 return -EINVAL;
2244
2245         printk(KERN_INFO "EXT3-fs: creating new journal on inode %u\n",
2246                journal_inum);
2247
2248         err = journal_create(journal);
2249         if (err) {
2250                 printk(KERN_ERR "EXT3-fs: error creating journal.\n");
2251                 journal_destroy(journal);
2252                 return -EIO;
2253         }
2254
2255         EXT3_SB(sb)->s_journal = journal;
2256
2257         ext3_update_dynamic_rev(sb);
2258         EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2259         EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2260
2261         es->s_journal_inum = cpu_to_le32(journal_inum);
2262         sb->s_dirt = 1;
2263
2264         /* Make sure we flush the recovery flag to disk. */
2265         ext3_commit_super(sb, es, 1);
2266
2267         return 0;
2268 }
2269
2270 static void ext3_commit_super (struct super_block * sb,
2271                                struct ext3_super_block * es,
2272                                int sync)
2273 {
2274         struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
2275
2276         if (!sbh)
2277                 return;
2278         es->s_wtime = cpu_to_le32(get_seconds());
2279         es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2280         es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2281         BUFFER_TRACE(sbh, "marking dirty");
2282         mark_buffer_dirty(sbh);
2283         if (sync)
2284                 sync_dirty_buffer(sbh);
2285 }
2286
2287
2288 /*
2289  * Have we just finished recovery?  If so, and if we are mounting (or
2290  * remounting) the filesystem readonly, then we will end up with a
2291  * consistent fs on disk.  Record that fact.
2292  */
2293 static void ext3_mark_recovery_complete(struct super_block * sb,
2294                                         struct ext3_super_block * es)
2295 {
2296         journal_t *journal = EXT3_SB(sb)->s_journal;
2297
2298         journal_lock_updates(journal);
2299         journal_flush(journal);
2300         lock_super(sb);
2301         if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2302             sb->s_flags & MS_RDONLY) {
2303                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2304                 sb->s_dirt = 0;
2305                 ext3_commit_super(sb, es, 1);
2306         }
2307         unlock_super(sb);
2308         journal_unlock_updates(journal);
2309 }
2310
2311 /*
2312  * If we are mounting (or read-write remounting) a filesystem whose journal
2313  * has recorded an error from a previous lifetime, move that error to the
2314  * main filesystem now.
2315  */
2316 static void ext3_clear_journal_err(struct super_block * sb,
2317                                    struct ext3_super_block * es)
2318 {
2319         journal_t *journal;
2320         int j_errno;
2321         const char *errstr;
2322
2323         journal = EXT3_SB(sb)->s_journal;
2324
2325         /*
2326          * Now check for any error status which may have been recorded in the
2327          * journal by a prior ext3_error() or ext3_abort()
2328          */
2329
2330         j_errno = journal_errno(journal);
2331         if (j_errno) {
2332                 char nbuf[16];
2333
2334                 errstr = ext3_decode_error(sb, j_errno, nbuf);
2335                 ext3_warning(sb, __func__, "Filesystem error recorded "
2336                              "from previous mount: %s", errstr);
2337                 ext3_warning(sb, __func__, "Marking fs in need of "
2338                              "filesystem check.");
2339
2340                 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2341                 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2342                 ext3_commit_super (sb, es, 1);
2343
2344                 journal_clear_err(journal);
2345         }
2346 }
2347
2348 /*
2349  * Force the running and committing transactions to commit,
2350  * and wait on the commit.
2351  */
2352 int ext3_force_commit(struct super_block *sb)
2353 {
2354         journal_t *journal;
2355         int ret;
2356
2357         if (sb->s_flags & MS_RDONLY)
2358                 return 0;
2359
2360         journal = EXT3_SB(sb)->s_journal;
2361         sb->s_dirt = 0;
2362         ret = ext3_journal_force_commit(journal);
2363         return ret;
2364 }
2365
2366 /*
2367  * Ext3 always journals updates to the superblock itself, so we don't
2368  * have to propagate any other updates to the superblock on disk at this
2369  * point.  Just start an async writeback to get the buffers on their way
2370  * to the disk.
2371  *
2372  * This implicitly triggers the writebehind on sync().
2373  */
2374
2375 static void ext3_write_super (struct super_block * sb)
2376 {
2377         if (mutex_trylock(&sb->s_lock) != 0)
2378                 BUG();
2379         sb->s_dirt = 0;
2380 }
2381
2382 static int ext3_sync_fs(struct super_block *sb, int wait)
2383 {
2384         tid_t target;
2385
2386         sb->s_dirt = 0;
2387         if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2388                 if (wait)
2389                         log_wait_commit(EXT3_SB(sb)->s_journal, target);
2390         }
2391         return 0;
2392 }
2393
2394 /*
2395  * LVM calls this function before a (read-only) snapshot is created.  This
2396  * gives us a chance to flush the journal completely and mark the fs clean.
2397  */
2398 static void ext3_write_super_lockfs(struct super_block *sb)
2399 {
2400         sb->s_dirt = 0;
2401
2402         if (!(sb->s_flags & MS_RDONLY)) {
2403                 journal_t *journal = EXT3_SB(sb)->s_journal;
2404
2405                 /* Now we set up the journal barrier. */
2406                 journal_lock_updates(journal);
2407                 journal_flush(journal);
2408
2409                 /* Journal blocked and flushed, clear needs_recovery flag. */
2410                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2411                 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2412         }
2413 }
2414
2415 /*
2416  * Called by LVM after the snapshot is done.  We need to reset the RECOVER
2417  * flag here, even though the filesystem is not technically dirty yet.
2418  */
2419 static void ext3_unlockfs(struct super_block *sb)
2420 {
2421         if (!(sb->s_flags & MS_RDONLY)) {
2422                 lock_super(sb);
2423                 /* Reser the needs_recovery flag before the fs is unlocked. */
2424                 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2425                 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2426                 unlock_super(sb);
2427                 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2428         }
2429 }
2430
2431 static int ext3_remount (struct super_block * sb, int * flags, char * data)
2432 {
2433         struct ext3_super_block * es;
2434         struct ext3_sb_info *sbi = EXT3_SB(sb);
2435         ext3_fsblk_t n_blocks_count = 0;
2436         unsigned long old_sb_flags;
2437         struct ext3_mount_options old_opts;
2438         int err;
2439 #ifdef CONFIG_QUOTA
2440         int i;
2441 #endif
2442
2443         /* Store the original options */
2444         old_sb_flags = sb->s_flags;
2445         old_opts.s_mount_opt = sbi->s_mount_opt;
2446         old_opts.s_resuid = sbi->s_resuid;
2447         old_opts.s_resgid = sbi->s_resgid;
2448         old_opts.s_commit_interval = sbi->s_commit_interval;
2449 #ifdef CONFIG_QUOTA
2450         old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2451         for (i = 0; i < MAXQUOTAS; i++)
2452                 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2453 #endif
2454
2455         /*
2456          * Allow the "check" option to be passed as a remount option.
2457          */
2458         if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2459                 err = -EINVAL;
2460                 goto restore_opts;
2461         }
2462
2463         if (sbi->s_mount_opt & EXT3_MOUNT_ABORT)
2464                 ext3_abort(sb, __func__, "Abort forced by user");
2465
2466         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2467                 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2468
2469         es = sbi->s_es;
2470
2471         ext3_init_journal_params(sb, sbi->s_journal);
2472
2473         if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2474                 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
2475                 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT) {
2476                         err = -EROFS;
2477                         goto restore_opts;
2478                 }
2479
2480                 if (*flags & MS_RDONLY) {
2481                         /*
2482                          * First of all, the unconditional stuff we have to do
2483                          * to disable replay of the journal when we next remount
2484                          */
2485                         sb->s_flags |= MS_RDONLY;
2486
2487                         /*
2488                          * OK, test if we are remounting a valid rw partition
2489                          * readonly, and if so set the rdonly flag and then
2490                          * mark the partition as valid again.
2491                          */
2492                         if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2493                             (sbi->s_mount_state & EXT3_VALID_FS))
2494                                 es->s_state = cpu_to_le16(sbi->s_mount_state);
2495
2496                         /*
2497                          * We have to unlock super so that we can wait for
2498                          * transactions.
2499                          */
2500                         unlock_super(sb);
2501                         ext3_mark_recovery_complete(sb, es);
2502                         lock_super(sb);
2503                 } else {
2504                         __le32 ret;
2505                         if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2506                                         ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2507                                 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2508                                        "remount RDWR because of unsupported "
2509                                        "optional features (%x).\n",
2510                                        sb->s_id, le32_to_cpu(ret));
2511                                 err = -EROFS;
2512                                 goto restore_opts;
2513                         }
2514
2515                         /*
2516                          * If we have an unprocessed orphan list hanging
2517                          * around from a previously readonly bdev mount,
2518                          * require a full umount/remount for now.
2519                          */
2520                         if (es->s_last_orphan) {
2521                                 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2522                                        "remount RDWR because of unprocessed "
2523                                        "orphan inode list.  Please "
2524                                        "umount/remount instead.\n",
2525                                        sb->s_id);
2526                                 err = -EINVAL;
2527                                 goto restore_opts;
2528                         }
2529
2530                         /*
2531                          * Mounting a RDONLY partition read-write, so reread
2532                          * and store the current valid flag.  (It may have
2533                          * been changed by e2fsck since we originally mounted
2534                          * the partition.)
2535                          */
2536                         ext3_clear_journal_err(sb, es);
2537                         sbi->s_mount_state = le16_to_cpu(es->s_state);
2538                         if ((err = ext3_group_extend(sb, es, n_blocks_count)))
2539                                 goto restore_opts;
2540                         if (!ext3_setup_super (sb, es, 0))
2541                                 sb->s_flags &= ~MS_RDONLY;
2542                 }
2543         }
2544 #ifdef CONFIG_QUOTA
2545         /* Release old quota file names */
2546         for (i = 0; i < MAXQUOTAS; i++)
2547                 if (old_opts.s_qf_names[i] &&
2548                     old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2549                         kfree(old_opts.s_qf_names[i]);
2550 #endif
2551         return 0;
2552 restore_opts:
2553         sb->s_flags = old_sb_flags;
2554         sbi->s_mount_opt = old_opts.s_mount_opt;
2555         sbi->s_resuid = old_opts.s_resuid;
2556         sbi->s_resgid = old_opts.s_resgid;
2557         sbi->s_commit_interval = old_opts.s_commit_interval;
2558 #ifdef CONFIG_QUOTA
2559         sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2560         for (i = 0; i < MAXQUOTAS; i++) {
2561                 if (sbi->s_qf_names[i] &&
2562                     old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2563                         kfree(sbi->s_qf_names[i]);
2564                 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2565         }
2566 #endif
2567         return err;
2568 }
2569
2570 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
2571 {
2572         struct super_block *sb = dentry->d_sb;
2573         struct ext3_sb_info *sbi = EXT3_SB(sb);
2574         struct ext3_super_block *es = sbi->s_es;
2575         u64 fsid;
2576
2577         if (test_opt(sb, MINIX_DF)) {
2578                 sbi->s_overhead_last = 0;
2579         } else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
2580                 unsigned long ngroups = sbi->s_groups_count, i;
2581                 ext3_fsblk_t overhead = 0;
2582                 smp_rmb();
2583
2584                 /*
2585                  * Compute the overhead (FS structures).  This is constant
2586                  * for a given filesystem unless the number of block groups
2587                  * changes so we cache the previous value until it does.
2588                  */
2589
2590                 /*
2591                  * All of the blocks before first_data_block are
2592                  * overhead
2593                  */
2594                 overhead = le32_to_cpu(es->s_first_data_block);
2595
2596                 /*
2597                  * Add the overhead attributed to the superblock and
2598                  * block group descriptors.  If the sparse superblocks
2599                  * feature is turned on, then not all groups have this.
2600                  */
2601                 for (i = 0; i < ngroups; i++) {
2602                         overhead += ext3_bg_has_super(sb, i) +
2603                                 ext3_bg_num_gdb(sb, i);
2604                         cond_resched();
2605                 }
2606
2607                 /*
2608                  * Every block group has an inode bitmap, a block
2609                  * bitmap, and an inode table.
2610                  */
2611                 overhead += ngroups * (2 + sbi->s_itb_per_group);
2612                 sbi->s_overhead_last = overhead;
2613                 smp_wmb();
2614                 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
2615         }
2616
2617         buf->f_type = EXT3_SUPER_MAGIC;
2618         buf->f_bsize = sb->s_blocksize;
2619         buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
2620         buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
2621         es->s_free_blocks_count = cpu_to_le32(buf->f_bfree);
2622         buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2623         if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2624                 buf->f_bavail = 0;
2625         buf->f_files = le32_to_cpu(es->s_inodes_count);
2626         buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
2627         es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
2628         buf->f_namelen = EXT3_NAME_LEN;
2629         fsid = le64_to_cpup((void *)es->s_uuid) ^
2630                le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2631         buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2632         buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
2633         return 0;
2634 }
2635
2636 /* Helper function for writing quotas on sync - we need to start transaction before quota file
2637  * is locked for write. Otherwise the are possible deadlocks:
2638  * Process 1                         Process 2
2639  * ext3_create()                     quota_sync()
2640  *   journal_start()                   write_dquot()
2641  *   DQUOT_INIT()                        down(dqio_mutex)
2642  *     down(dqio_mutex)                    journal_start()
2643  *
2644  */
2645
2646 #ifdef CONFIG_QUOTA
2647
2648 static inline struct inode *dquot_to_inode(struct dquot *dquot)
2649 {
2650         return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2651 }
2652
2653 static int ext3_dquot_initialize(struct inode *inode, int type)
2654 {
2655         handle_t *handle;
2656         int ret, err;
2657
2658         /* We may create quota structure so we need to reserve enough blocks */
2659         handle = ext3_journal_start(inode, 2*EXT3_QUOTA_INIT_BLOCKS(inode->i_sb));
2660         if (IS_ERR(handle))
2661                 return PTR_ERR(handle);
2662         ret = dquot_initialize(inode, type);
2663         err = ext3_journal_stop(handle);
2664         if (!ret)
2665                 ret = err;
2666         return ret;
2667 }
2668
2669 static int ext3_dquot_drop(struct inode *inode)
2670 {
2671         handle_t *handle;
2672         int ret, err;
2673
2674         /* We may delete quota structure so we need to reserve enough blocks */
2675         handle = ext3_journal_start(inode, 2*EXT3_QUOTA_DEL_BLOCKS(inode->i_sb));
2676         if (IS_ERR(handle)) {
2677                 /*
2678                  * We call dquot_drop() anyway to at least release references
2679                  * to quota structures so that umount does not hang.
2680                  */
2681                 dquot_drop(inode);
2682                 return PTR_ERR(handle);
2683         }
2684         ret = dquot_drop(inode);
2685         err = ext3_journal_stop(handle);
2686         if (!ret)
2687                 ret = err;
2688         return ret;
2689 }
2690
2691 static int ext3_write_dquot(struct dquot *dquot)
2692 {
2693         int ret, err;
2694         handle_t *handle;
2695         struct inode *inode;
2696
2697         inode = dquot_to_inode(dquot);
2698         handle = ext3_journal_start(inode,
2699                                         EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2700         if (IS_ERR(handle))
2701                 return PTR_ERR(handle);
2702         ret = dquot_commit(dquot);
2703         err = ext3_journal_stop(handle);
2704         if (!ret)
2705                 ret = err;
2706         return ret;
2707 }
2708
2709 static int ext3_acquire_dquot(struct dquot *dquot)
2710 {
2711         int ret, err;
2712         handle_t *handle;
2713
2714         handle = ext3_journal_start(dquot_to_inode(dquot),
2715                                         EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2716         if (IS_ERR(handle))
2717                 return PTR_ERR(handle);
2718         ret = dquot_acquire(dquot);
2719         err = ext3_journal_stop(handle);
2720         if (!ret)
2721                 ret = err;
2722         return ret;
2723 }
2724
2725 static int ext3_release_dquot(struct dquot *dquot)
2726 {
2727         int ret, err;
2728         handle_t *handle;
2729
2730         handle = ext3_journal_start(dquot_to_inode(dquot),
2731                                         EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2732         if (IS_ERR(handle)) {
2733                 /* Release dquot anyway to avoid endless cycle in dqput() */
2734                 dquot_release(dquot);
2735                 return PTR_ERR(handle);
2736         }
2737         ret = dquot_release(dquot);
2738         err = ext3_journal_stop(handle);
2739         if (!ret)
2740                 ret = err;
2741         return ret;
2742 }
2743
2744 static int ext3_mark_dquot_dirty(struct dquot *dquot)
2745 {
2746         /* Are we journaling quotas? */
2747         if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2748             EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2749                 dquot_mark_dquot_dirty(dquot);
2750                 return ext3_write_dquot(dquot);
2751         } else {
2752                 return dquot_mark_dquot_dirty(dquot);
2753         }
2754 }
2755
2756 static int ext3_write_info(struct super_block *sb, int type)
2757 {
2758         int ret, err;
2759         handle_t *handle;
2760
2761         /* Data block + inode block */
2762         handle = ext3_journal_start(sb->s_root->d_inode, 2);
2763         if (IS_ERR(handle))
2764                 return PTR_ERR(handle);
2765         ret = dquot_commit_info(sb, type);
2766         err = ext3_journal_stop(handle);
2767         if (!ret)
2768                 ret = err;
2769         return ret;
2770 }
2771
2772 /*
2773  * Turn on quotas during mount time - we need to find
2774  * the quota file and such...
2775  */
2776 static int ext3_quota_on_mount(struct super_block *sb, int type)
2777 {
2778         return vfs_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2779                         EXT3_SB(sb)->s_jquota_fmt, type);
2780 }
2781
2782 /*
2783  * Standard function to be called on quota_on
2784  */
2785 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
2786                          char *name, int remount)
2787 {
2788         int err;
2789         struct path path;
2790
2791         if (!test_opt(sb, QUOTA))
2792                 return -EINVAL;
2793         /* When remounting, no checks are needed and in fact, name is NULL */
2794         if (remount)
2795                 return vfs_quota_on(sb, type, format_id, name, remount);
2796
2797         err = kern_path(name, LOOKUP_FOLLOW, &path);
2798         if (err)
2799                 return err;
2800
2801         /* Quotafile not on the same filesystem? */
2802         if (path.mnt->mnt_sb != sb) {
2803                 path_put(&path);
2804                 return -EXDEV;
2805         }
2806         /* Journaling quota? */
2807         if (EXT3_SB(sb)->s_qf_names[type]) {
2808                 /* Quotafile not of fs root? */
2809                 if (path.dentry->d_parent != sb->s_root)
2810                         printk(KERN_WARNING
2811                                 "EXT3-fs: Quota file not on filesystem root. "
2812                                 "Journaled quota will not work.\n");
2813         }
2814
2815         /*
2816          * When we journal data on quota file, we have to flush journal to see
2817          * all updates to the file when we bypass pagecache...
2818          */
2819         if (ext3_should_journal_data(path.dentry->d_inode)) {
2820                 /*
2821                  * We don't need to lock updates but journal_flush() could
2822                  * otherwise be livelocked...
2823                  */
2824                 journal_lock_updates(EXT3_SB(sb)->s_journal);
2825                 journal_flush(EXT3_SB(sb)->s_journal);
2826                 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2827         }
2828
2829         err = vfs_quota_on_path(sb, type, format_id, &path);
2830         path_put(&path);
2831         return err;
2832 }
2833
2834 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2835  * acquiring the locks... As quota files are never truncated and quota code
2836  * itself serializes the operations (and noone else should touch the files)
2837  * we don't have to be afraid of races */
2838 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2839                                size_t len, loff_t off)
2840 {
2841         struct inode *inode = sb_dqopt(sb)->files[type];
2842         sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2843         int err = 0;
2844         int offset = off & (sb->s_blocksize - 1);
2845         int tocopy;
2846         size_t toread;
2847         struct buffer_head *bh;
2848         loff_t i_size = i_size_read(inode);
2849
2850         if (off > i_size)
2851                 return 0;
2852         if (off+len > i_size)
2853                 len = i_size-off;
2854         toread = len;
2855         while (toread > 0) {
2856                 tocopy = sb->s_blocksize - offset < toread ?
2857                                 sb->s_blocksize - offset : toread;
2858                 bh = ext3_bread(NULL, inode, blk, 0, &err);
2859                 if (err)
2860                         return err;
2861                 if (!bh)        /* A hole? */
2862                         memset(data, 0, tocopy);
2863                 else
2864                         memcpy(data, bh->b_data+offset, tocopy);
2865                 brelse(bh);
2866                 offset = 0;
2867                 toread -= tocopy;
2868                 data += tocopy;
2869                 blk++;
2870         }
2871         return len;
2872 }
2873
2874 /* Write to quotafile (we know the transaction is already started and has
2875  * enough credits) */
2876 static ssize_t ext3_quota_write(struct super_block *sb, int type,
2877                                 const char *data, size_t len, loff_t off)
2878 {
2879         struct inode *inode = sb_dqopt(sb)->files[type];
2880         sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2881         int err = 0;
2882         int offset = off & (sb->s_blocksize - 1);
2883         int tocopy;
2884         int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
2885         size_t towrite = len;
2886         struct buffer_head *bh;
2887         handle_t *handle = journal_current_handle();
2888
2889         if (!handle) {
2890                 printk(KERN_WARNING "EXT3-fs: Quota write (off=%Lu, len=%Lu)"
2891                         " cancelled because transaction is not started.\n",
2892                         (unsigned long long)off, (unsigned long long)len);
2893                 return -EIO;
2894         }
2895         mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2896         while (towrite > 0) {
2897                 tocopy = sb->s_blocksize - offset < towrite ?
2898                                 sb->s_blocksize - offset : towrite;
2899                 bh = ext3_bread(handle, inode, blk, 1, &err);
2900                 if (!bh)
2901                         goto out;
2902                 if (journal_quota) {
2903                         err = ext3_journal_get_write_access(handle, bh);
2904                         if (err) {
2905                                 brelse(bh);
2906                                 goto out;
2907                         }
2908                 }
2909                 lock_buffer(bh);
2910                 memcpy(bh->b_data+offset, data, tocopy);
2911                 flush_dcache_page(bh->b_page);
2912                 unlock_buffer(bh);
2913                 if (journal_quota)
2914                         err = ext3_journal_dirty_metadata(handle, bh);
2915                 else {
2916                         /* Always do at least ordered writes for quotas */
2917                         err = ext3_journal_dirty_data(handle, bh);
2918                         mark_buffer_dirty(bh);
2919                 }
2920                 brelse(bh);
2921                 if (err)
2922                         goto out;
2923                 offset = 0;
2924                 towrite -= tocopy;
2925                 data += tocopy;
2926                 blk++;
2927         }
2928 out:
2929         if (len == towrite) {
2930                 mutex_unlock(&inode->i_mutex);
2931                 return err;
2932         }
2933         if (inode->i_size < off+len-towrite) {
2934                 i_size_write(inode, off+len-towrite);
2935                 EXT3_I(inode)->i_disksize = inode->i_size;
2936         }
2937         inode->i_version++;
2938         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2939         ext3_mark_inode_dirty(handle, inode);
2940         mutex_unlock(&inode->i_mutex);
2941         return len - towrite;
2942 }
2943
2944 #endif
2945
2946 static int ext3_get_sb(struct file_system_type *fs_type,
2947         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
2948 {
2949         return get_sb_bdev(fs_type, flags, dev_name, data, ext3_fill_super, mnt);
2950 }
2951
2952 static struct file_system_type ext3_fs_type = {
2953         .owner          = THIS_MODULE,
2954         .name           = "ext3",
2955         .get_sb         = ext3_get_sb,
2956         .kill_sb        = kill_block_super,
2957         .fs_flags       = FS_REQUIRES_DEV,
2958 };
2959
2960 static int __init init_ext3_fs(void)
2961 {
2962         int err = init_ext3_xattr();
2963         if (err)
2964                 return err;
2965         err = init_inodecache();
2966         if (err)
2967                 goto out1;
2968         err = register_filesystem(&ext3_fs_type);
2969         if (err)
2970                 goto out;
2971         return 0;
2972 out:
2973         destroy_inodecache();
2974 out1:
2975         exit_ext3_xattr();
2976         return err;
2977 }
2978
2979 static void __exit exit_ext3_fs(void)
2980 {
2981         unregister_filesystem(&ext3_fs_type);
2982         destroy_inodecache();
2983         exit_ext3_xattr();
2984 }
2985
2986 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
2987 MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
2988 MODULE_LICENSE("GPL");
2989 module_init(init_ext3_fs)
2990 module_exit(exit_ext3_fs)