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