fs/ext3/super.c

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