git.oblomov.eu Git - linux-2.6/blob - fs/ext3/super.c

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