fs/ext3/super.c

   1 /*
   2  *  linux/fs/ext3/super.c
   3  *
   4  * Copyright (C) 1992, 1993, 1994, 1995
   5  * Remy Card ([email protected])
   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 ([email protected]), 1995
  17  */
  18
  19 #include <linux/module.h>
  20 #include <linux/string.h>
  21 #include <linux/fs.h>
  22 #include <linux/time.h>
  23 #include <linux/jbd.h>
  24 #include <linux/ext3_fs.h>
  25 #include <linux/ext3_jbd.h>
  26 #include <linux/slab.h>
  27 #include <linux/init.h>
  28 #include <linux/blkdev.h>
  29 #include <linux/parser.h>
  30 #include <linux/smp_lock.h>
  31 #include <linux/buffer_head.h>
  32 #include <linux/exportfs.h>
  33 #include <linux/vfs.h>
  34 #include <linux/random.h>
  35 #include <linux/mount.h>
  36 #include <linux/namei.h>
  37 #include <linux/quotaops.h>
  38 #include <linux/seq_file.h>
  39 #include <linux/log2.h>
  40
  41 #include <asm/uaccess.h>
  42
  43 #include "xattr.h"
  44 #include "acl.h"
  45 #include "namei.h"
  46
  47 #ifdef CONFIG_EXT3_DEFAULTS_TO_ORDERED
  48   #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_ORDERED_DATA
  49 #else
  50   #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_WRITEBACK_DATA
  51 #endif
  52
  53 static int ext3_load_journal(struct super_block *, struct ext3_super_block *,
  54                              unsigned long journal_devnum);
  55 static int ext3_create_journal(struct super_block *, struct ext3_super_block *,
  56                                unsigned int);
  57 static int ext3_commit_super(struct super_block *sb,
  58                                struct ext3_super_block *es,
  59                                int sync);
  60 static void ext3_mark_recovery_complete(struct super_block * sb,
  61                                         struct ext3_super_block * es);
  62 static void ext3_clear_journal_err(struct super_block * sb,
  63                                    struct ext3_super_block * es);
  64 static int ext3_sync_fs(struct super_block *sb, int wait);
  65 static const char *ext3_decode_error(struct super_block * sb, int errno,
  66                                      char nbuf[16]);
  67 static int ext3_remount (struct super_block * sb, int * flags, char * data);
  68 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf);
  69 static int ext3_unfreeze(struct super_block *sb);
  70 static int ext3_freeze(struct super_block *sb);
  71
  72 /*
  73  * Wrappers for journal_start/end.
  74  *
  75  * The only special thing we need to do here is to make sure that all
  76  * journal_end calls result in the superblock being marked dirty, so
  77  * that sync() will call the filesystem's write_super callback if
  78  * appropriate.
  79  */
  80 handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks)
  81 {
  82         journal_t *journal;
  83
  84         if (sb->s_flags & MS_RDONLY)
  85                 return ERR_PTR(-EROFS);
  86
  87         /* Special case here: if the journal has aborted behind our
  88          * backs (eg. EIO in the commit thread), then we still need to
  89          * take the FS itself readonly cleanly. */
  90         journal = EXT3_SB(sb)->s_journal;
  91         if (is_journal_aborted(journal)) {
  92                 ext3_abort(sb, __func__,
  93                            "Detected aborted journal");
  94                 return ERR_PTR(-EROFS);
  95         }
  96
  97         return journal_start(journal, nblocks);
  98 }
  99
 100 /*
 101  * The only special thing we need to do here is to make sure that all
 102  * journal_stop calls result in the superblock being marked dirty, so
 103  * that sync() will call the filesystem's write_super callback if
 104  * appropriate.
 105  */
 106 int __ext3_journal_stop(const char *where, handle_t *handle)
 107 {
 108         struct super_block *sb;
 109         int err;
 110         int rc;
 111
 112         sb = handle->h_transaction->t_journal->j_private;
 113         err = handle->h_err;
 114         rc = journal_stop(handle);
 115
 116         if (!err)
 117                 err = rc;
 118         if (err)
 119                 __ext3_std_error(sb, where, err);
 120         return err;
 121 }
 122
 123 void ext3_journal_abort_handle(const char *caller, const char *err_fn,
 124                 struct buffer_head *bh, handle_t *handle, int err)
 125 {
 126         char nbuf[16];
 127         const char *errstr = ext3_decode_error(NULL, err, nbuf);
 128
 129         if (bh)
 130                 BUFFER_TRACE(bh, "abort");
 131
 132         if (!handle->h_err)
 133                 handle->h_err = err;
 134
 135         if (is_handle_aborted(handle))
 136                 return;
 137
 138         printk(KERN_ERR "EXT3-fs: %s: aborting transaction: %s in %s\n",
 139                 caller, errstr, err_fn);
 140
 141         journal_abort_handle(handle);
 142 }
 143
 144 void ext3_msg(struct super_block *sb, const char *prefix,
 145                 const char *fmt, ...)
 146 {
 147         va_list args;
 148
 149         va_start(args, fmt);
 150         printk("%sEXT3-fs (%s): ", prefix, sb->s_id);
 151         vprintk(fmt, args);
 152         printk("\n");
 153         va_end(args);
 154 }
 155
 156 /* Deal with the reporting of failure conditions on a filesystem such as
 157  * inconsistencies detected or read IO failures.
 158  *
 159  * On ext2, we can store the error state of the filesystem in the
 160  * superblock.  That is not possible on ext3, because we may have other
 161  * write ordering constraints on the superblock which prevent us from
 162  * writing it out straight away; and given that the journal is about to
 163  * be aborted, we can't rely on the current, or future, transactions to
 164  * write out the superblock safely.
 165  *
 166  * We'll just use the journal_abort() error code to record an error in
 167  * the journal instead.  On recovery, the journal will complain about
 168  * that error until we've noted it down and cleared it.
 169  */
 170
 171 static void ext3_handle_error(struct super_block *sb)
 172 {
 173         struct ext3_super_block *es = EXT3_SB(sb)->s_es;
 174
 175         EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
 176         es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
 177
 178         if (sb->s_flags & MS_RDONLY)
 179                 return;
 180
 181         if (!test_opt (sb, ERRORS_CONT)) {
 182                 journal_t *journal = EXT3_SB(sb)->s_journal;
 183
 184                 set_opt(EXT3_SB(sb)->s_mount_opt, ABORT);
 185                 if (journal)
 186                         journal_abort(journal, -EIO);
 187         }
 188         if (test_opt (sb, ERRORS_RO)) {
 189                 ext3_msg(sb, KERN_CRIT,
 190                         "error: remounting filesystem read-only");
 191                 sb->s_flags |= MS_RDONLY;
 192         }
 193         ext3_commit_super(sb, es, 1);
 194         if (test_opt(sb, ERRORS_PANIC))
 195                 panic("EXT3-fs (%s): panic forced after error\n",
 196                         sb->s_id);
 197 }
 198
 199 void ext3_error (struct super_block * sb, const char * function,
 200                  const char * fmt, ...)
 201 {
 202         va_list args;
 203
 204         va_start(args, fmt);
 205         printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
 206         vprintk(fmt, args);
 207         printk("\n");
 208         va_end(args);
 209
 210         ext3_handle_error(sb);
 211 }
 212
 213 static const char *ext3_decode_error(struct super_block * sb, int errno,
 214                                      char nbuf[16])
 215 {
 216         char *errstr = NULL;
 217
 218         switch (errno) {
 219         case -EIO:
 220                 errstr = "IO failure";
 221                 break;
 222         case -ENOMEM:
 223                 errstr = "Out of memory";
 224                 break;
 225         case -EROFS:
 226                 if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT)
 227                         errstr = "Journal has aborted";
 228                 else
 229                         errstr = "Readonly filesystem";
 230                 break;
 231         default:
 232                 /* If the caller passed in an extra buffer for unknown
 233                  * errors, textualise them now.  Else we just return
 234                  * NULL. */
 235                 if (nbuf) {
 236                         /* Check for truncated error codes... */
 237                         if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
 238                                 errstr = nbuf;
 239                 }
 240                 break;
 241         }
 242
 243         return errstr;
 244 }
 245
 246 /* __ext3_std_error decodes expected errors from journaling functions
 247  * automatically and invokes the appropriate error response.  */
 248
 249 void __ext3_std_error (struct super_block * sb, const char * function,
 250                        int errno)
 251 {
 252         char nbuf[16];
 253         const char *errstr;
 254
 255         /* Special case: if the error is EROFS, and we're not already
 256          * inside a transaction, then there's really no point in logging
 257          * an error. */
 258         if (errno == -EROFS && journal_current_handle() == NULL &&
 259             (sb->s_flags & MS_RDONLY))
 260                 return;
 261
 262         errstr = ext3_decode_error(sb, errno, nbuf);
 263         ext3_msg(sb, KERN_CRIT, "error in %s: %s", function, errstr);
 264
 265         ext3_handle_error(sb);
 266 }
 267
 268 /*
 269  * ext3_abort is a much stronger failure handler than ext3_error.  The
 270  * abort function may be used to deal with unrecoverable failures such
 271  * as journal IO errors or ENOMEM at a critical moment in log management.
 272  *
 273  * We unconditionally force the filesystem into an ABORT|READONLY state,
 274  * unless the error response on the fs has been set to panic in which
 275  * case we take the easy way out and panic immediately.
 276  */
 277
 278 void ext3_abort (struct super_block * sb, const char * function,
 279                  const char * fmt, ...)
 280 {
 281         va_list args;
 282
 283         va_start(args, fmt);
 284         printk(KERN_CRIT "EXT3-fs (%s): error: %s: ", sb->s_id, function);
 285         vprintk(fmt, args);
 286         printk("\n");
 287         va_end(args);
 288
 289         if (test_opt(sb, ERRORS_PANIC))
 290                 panic("EXT3-fs: panic from previous error\n");
 291
 292         if (sb->s_flags & MS_RDONLY)
 293                 return;
 294
 295         ext3_msg(sb, KERN_CRIT,
 296                 "error: remounting filesystem read-only");
 297         EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
 298         sb->s_flags |= MS_RDONLY;
 299         set_opt(EXT3_SB(sb)->s_mount_opt, ABORT);
 300         if (EXT3_SB(sb)->s_journal)
 301                 journal_abort(EXT3_SB(sb)->s_journal, -EIO);
 302 }
 303
 304 void ext3_warning (struct super_block * sb, const char * function,
 305                    const char * fmt, ...)
 306 {
 307         va_list args;
 308
 309         va_start(args, fmt);
 310         printk(KERN_WARNING "EXT3-fs (%s): warning: %s: ",
 311                sb->s_id, function);
 312         vprintk(fmt, args);
 313         printk("\n");
 314         va_end(args);
 315 }
 316
 317 void ext3_update_dynamic_rev(struct super_block *sb)
 318 {
 319         struct ext3_super_block *es = EXT3_SB(sb)->s_es;
 320
 321         if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
 322                 return;
 323
 324         ext3_msg(sb, KERN_WARNING,
 325                 "warning: updating to rev %d because of "
 326                 "new feature flag, running e2fsck is recommended",
 327                 EXT3_DYNAMIC_REV);
 328
 329         es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO);
 330         es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE);
 331         es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV);
 332         /* leave es->s_feature_*compat flags alone */
 333         /* es->s_uuid will be set by e2fsck if empty */
 334
 335         /*
 336          * The rest of the superblock fields should be zero, and if not it
 337          * means they are likely already in use, so leave them alone.  We
 338          * can leave it up to e2fsck to clean up any inconsistencies there.
 339          */
 340 }
 341
 342 /*
 343  * Open the external journal device
 344  */
 345 static struct block_device *ext3_blkdev_get(dev_t dev, struct super_block *sb)
 346 {
 347         struct block_device *bdev;
 348         char b[BDEVNAME_SIZE];
 349
 350         bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
 351         if (IS_ERR(bdev))
 352                 goto fail;
 353         return bdev;
 354
 355 fail:
 356         ext3_msg(sb, "error: failed to open journal device %s: %ld",
 357                 __bdevname(dev, b), PTR_ERR(bdev));
 358
 359         return NULL;
 360 }
 361
 362 /*
 363  * Release the journal device
 364  */
 365 static int ext3_blkdev_put(struct block_device *bdev)
 366 {
 367         return blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
 368 }
 369
 370 static int ext3_blkdev_remove(struct ext3_sb_info *sbi)
 371 {
 372         struct block_device *bdev;
 373         int ret = -ENODEV;
 374
 375         bdev = sbi->journal_bdev;
 376         if (bdev) {
 377                 ret = ext3_blkdev_put(bdev);
 378                 sbi->journal_bdev = NULL;
 379         }
 380         return ret;
 381 }
 382
 383 static inline struct inode *orphan_list_entry(struct list_head *l)
 384 {
 385         return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
 386 }
 387
 388 static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
 389 {
 390         struct list_head *l;
 391
 392         ext3_msg(sb, KERN_ERR, "error: sb orphan head is %d",
 393                le32_to_cpu(sbi->s_es->s_last_orphan));
 394
 395         ext3_msg(sb, KERN_ERR, "sb_info orphan list:");
 396         list_for_each(l, &sbi->s_orphan) {
 397                 struct inode *inode = orphan_list_entry(l);
 398                 ext3_msg(sb, KERN_ERR, "  "
 399                        "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
 400                        inode->i_sb->s_id, inode->i_ino, inode,
 401                        inode->i_mode, inode->i_nlink,
 402                        NEXT_ORPHAN(inode));
 403         }
 404 }
 405
 406 static void ext3_put_super (struct super_block * sb)
 407 {
 408         struct ext3_sb_info *sbi = EXT3_SB(sb);
 409         struct ext3_super_block *es = sbi->s_es;
 410         int i, err;
 411
 412         dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
 413         ext3_xattr_put_super(sb);
 414         err = journal_destroy(sbi->s_journal);
 415         sbi->s_journal = NULL;
 416         if (err < 0)
 417                 ext3_abort(sb, __func__, "Couldn't clean up the journal");
 418
 419         if (!(sb->s_flags & MS_RDONLY)) {
 420                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
 421                 es->s_state = cpu_to_le16(sbi->s_mount_state);
 422                 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
 423                 mark_buffer_dirty(sbi->s_sbh);
 424                 ext3_commit_super(sb, es, 1);
 425         }
 426
 427         for (i = 0; i < sbi->s_gdb_count; i++)
 428                 brelse(sbi->s_group_desc[i]);
 429         kfree(sbi->s_group_desc);
 430         percpu_counter_destroy(&sbi->s_freeblocks_counter);
 431         percpu_counter_destroy(&sbi->s_freeinodes_counter);
 432         percpu_counter_destroy(&sbi->s_dirs_counter);
 433         brelse(sbi->s_sbh);
 434 #ifdef CONFIG_QUOTA
 435         for (i = 0; i < MAXQUOTAS; i++)
 436                 kfree(sbi->s_qf_names[i]);
 437 #endif
 438
 439         /* Debugging code just in case the in-memory inode orphan list
 440          * isn't empty.  The on-disk one can be non-empty if we've
 441          * detected an error and taken the fs readonly, but the
 442          * in-memory list had better be clean by this point. */
 443         if (!list_empty(&sbi->s_orphan))
 444                 dump_orphan_list(sb, sbi);
 445         J_ASSERT(list_empty(&sbi->s_orphan));
 446
 447         invalidate_bdev(sb->s_bdev);
 448         if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
 449                 /*
 450                  * Invalidate the journal device's buffers.  We don't want them
 451                  * floating about in memory - the physical journal device may
 452                  * hotswapped, and it breaks the `ro-after' testing code.
 453                  */
 454                 sync_blockdev(sbi->journal_bdev);
 455                 invalidate_bdev(sbi->journal_bdev);
 456                 ext3_blkdev_remove(sbi);
 457         }
 458         sb->s_fs_info = NULL;
 459         kfree(sbi->s_blockgroup_lock);
 460         kfree(sbi);
 461 }
 462
 463 static struct kmem_cache *ext3_inode_cachep;
 464
 465 /*
 466  * Called inside transaction, so use GFP_NOFS
 467  */
 468 static struct inode *ext3_alloc_inode(struct super_block *sb)
 469 {
 470         struct ext3_inode_info *ei;
 471
 472         ei = kmem_cache_alloc(ext3_inode_cachep, GFP_NOFS);
 473         if (!ei)
 474                 return NULL;
 475         ei->i_block_alloc_info = NULL;
 476         ei->vfs_inode.i_version = 1;
 477         atomic_set(&ei->i_datasync_tid, 0);
 478         atomic_set(&ei->i_sync_tid, 0);
 479         return &ei->vfs_inode;
 480 }
 481
 482 static void ext3_destroy_inode(struct inode *inode)
 483 {
 484         if (!list_empty(&(EXT3_I(inode)->i_orphan))) {
 485                 printk("EXT3 Inode %p: orphan list check failed!\n",
 486                         EXT3_I(inode));
 487                 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
 488                                 EXT3_I(inode), sizeof(struct ext3_inode_info),
 489                                 false);
 490                 dump_stack();
 491         }
 492         kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
 493 }
 494
 495 static void init_once(void *foo)
 496 {
 497         struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
 498
 499         INIT_LIST_HEAD(&ei->i_orphan);
 500 #ifdef CONFIG_EXT3_FS_XATTR
 501         init_rwsem(&ei->xattr_sem);
 502 #endif
 503         mutex_init(&ei->truncate_mutex);
 504         inode_init_once(&ei->vfs_inode);
 505 }
 506
 507 static int init_inodecache(void)
 508 {
 509         ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
 510                                              sizeof(struct ext3_inode_info),
 511                                              0, (SLAB_RECLAIM_ACCOUNT|
 512                                                 SLAB_MEM_SPREAD),
 513                                              init_once);
 514         if (ext3_inode_cachep == NULL)
 515                 return -ENOMEM;
 516         return 0;
 517 }
 518
 519 static void destroy_inodecache(void)
 520 {
 521         kmem_cache_destroy(ext3_inode_cachep);
 522 }
 523
 524 static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
 525 {
 526 #if defined(CONFIG_QUOTA)
 527         struct ext3_sb_info *sbi = EXT3_SB(sb);
 528
 529         if (sbi->s_jquota_fmt) {
 530                 char *fmtname = "";
 531
 532                 switch (sbi->s_jquota_fmt) {
 533                 case QFMT_VFS_OLD:
 534                         fmtname = "vfsold";
 535                         break;
 536                 case QFMT_VFS_V0:
 537                         fmtname = "vfsv0";
 538                         break;
 539                 case QFMT_VFS_V1:
 540                         fmtname = "vfsv1";
 541                         break;
 542                 }
 543                 seq_printf(seq, ",jqfmt=%s", fmtname);
 544         }
 545
 546         if (sbi->s_qf_names[USRQUOTA])
 547                 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
 548
 549         if (sbi->s_qf_names[GRPQUOTA])
 550                 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
 551
 552         if (test_opt(sb, USRQUOTA))
 553                 seq_puts(seq, ",usrquota");
 554
 555         if (test_opt(sb, GRPQUOTA))
 556                 seq_puts(seq, ",grpquota");
 557 #endif
 558 }
 559
 560 static char *data_mode_string(unsigned long mode)
 561 {
 562         switch (mode) {
 563         case EXT3_MOUNT_JOURNAL_DATA:
 564                 return "journal";
 565         case EXT3_MOUNT_ORDERED_DATA:
 566                 return "ordered";
 567         case EXT3_MOUNT_WRITEBACK_DATA:
 568                 return "writeback";
 569         }
 570         return "unknown";
 571 }
 572
 573 /*
 574  * Show an option if
 575  *  - it's set to a non-default value OR
 576  *  - if the per-sb default is different from the global default
 577  */
 578 static int ext3_show_options(struct seq_file *seq, struct vfsmount *vfs)
 579 {
 580         struct super_block *sb = vfs->mnt_sb;
 581         struct ext3_sb_info *sbi = EXT3_SB(sb);
 582         struct ext3_super_block *es = sbi->s_es;
 583         unsigned long def_mount_opts;
 584
 585         def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
 586
 587         if (sbi->s_sb_block != 1)
 588                 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
 589         if (test_opt(sb, MINIX_DF))
 590                 seq_puts(seq, ",minixdf");
 591         if (test_opt(sb, GRPID))
 592                 seq_puts(seq, ",grpid");
 593         if (!test_opt(sb, GRPID) && (def_mount_opts & EXT3_DEFM_BSDGROUPS))
 594                 seq_puts(seq, ",nogrpid");
 595         if (sbi->s_resuid != EXT3_DEF_RESUID ||
 596             le16_to_cpu(es->s_def_resuid) != EXT3_DEF_RESUID) {
 597                 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
 598         }
 599         if (sbi->s_resgid != EXT3_DEF_RESGID ||
 600             le16_to_cpu(es->s_def_resgid) != EXT3_DEF_RESGID) {
 601                 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
 602         }
 603         if (test_opt(sb, ERRORS_RO)) {
 604                 int def_errors = le16_to_cpu(es->s_errors);
 605
 606                 if (def_errors == EXT3_ERRORS_PANIC ||
 607                     def_errors == EXT3_ERRORS_CONTINUE) {
 608                         seq_puts(seq, ",errors=remount-ro");
 609                 }
 610         }
 611         if (test_opt(sb, ERRORS_CONT))
 612                 seq_puts(seq, ",errors=continue");
 613         if (test_opt(sb, ERRORS_PANIC))
 614                 seq_puts(seq, ",errors=panic");
 615         if (test_opt(sb, NO_UID32))
 616                 seq_puts(seq, ",nouid32");
 617         if (test_opt(sb, DEBUG))
 618                 seq_puts(seq, ",debug");
 619         if (test_opt(sb, OLDALLOC))
 620                 seq_puts(seq, ",oldalloc");
 621 #ifdef CONFIG_EXT3_FS_XATTR
 622         if (test_opt(sb, XATTR_USER))
 623                 seq_puts(seq, ",user_xattr");
 624         if (!test_opt(sb, XATTR_USER) &&
 625             (def_mount_opts & EXT3_DEFM_XATTR_USER)) {
 626                 seq_puts(seq, ",nouser_xattr");
 627         }
 628 #endif
 629 #ifdef CONFIG_EXT3_FS_POSIX_ACL
 630         if (test_opt(sb, POSIX_ACL))
 631                 seq_puts(seq, ",acl");
 632         if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT3_DEFM_ACL))
 633                 seq_puts(seq, ",noacl");
 634 #endif
 635         if (!test_opt(sb, RESERVATION))
 636                 seq_puts(seq, ",noreservation");
 637         if (sbi->s_commit_interval) {
 638                 seq_printf(seq, ",commit=%u",
 639                            (unsigned) (sbi->s_commit_interval / HZ));
 640         }
 641
 642         /*
 643          * Always display barrier state so it's clear what the status is.
 644          */
 645         seq_puts(seq, ",barrier=");
 646         seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
 647         seq_printf(seq, ",data=%s", data_mode_string(test_opt(sb, DATA_FLAGS)));
 648         if (test_opt(sb, DATA_ERR_ABORT))
 649                 seq_puts(seq, ",data_err=abort");
 650
 651         if (test_opt(sb, NOLOAD))
 652                 seq_puts(seq, ",norecovery");
 653
 654         ext3_show_quota_options(seq, sb);
 655
 656         return 0;
 657 }
 658
 659
 660 static struct inode *ext3_nfs_get_inode(struct super_block *sb,
 661                 u64 ino, u32 generation)
 662 {
 663         struct inode *inode;
 664
 665         if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO)
 666                 return ERR_PTR(-ESTALE);
 667         if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count))
 668                 return ERR_PTR(-ESTALE);
 669
 670         /* iget isn't really right if the inode is currently unallocated!!
 671          *
 672          * ext3_read_inode will return a bad_inode if the inode had been
 673          * deleted, so we should be safe.
 674          *
 675          * Currently we don't know the generation for parent directory, so
 676          * a generation of 0 means "accept any"
 677          */
 678         inode = ext3_iget(sb, ino);
 679         if (IS_ERR(inode))
 680                 return ERR_CAST(inode);
 681         if (generation && inode->i_generation != generation) {
 682                 iput(inode);
 683                 return ERR_PTR(-ESTALE);
 684         }
 685
 686         return inode;
 687 }
 688
 689 static struct dentry *ext3_fh_to_dentry(struct super_block *sb, struct fid *fid,
 690                 int fh_len, int fh_type)
 691 {
 692         return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
 693                                     ext3_nfs_get_inode);
 694 }
 695
 696 static struct dentry *ext3_fh_to_parent(struct super_block *sb, struct fid *fid,
 697                 int fh_len, int fh_type)
 698 {
 699         return generic_fh_to_parent(sb, fid, fh_len, fh_type,
 700                                     ext3_nfs_get_inode);
 701 }
 702
 703 /*
 704  * Try to release metadata pages (indirect blocks, directories) which are
 705  * mapped via the block device.  Since these pages could have journal heads
 706  * which would prevent try_to_free_buffers() from freeing them, we must use
 707  * jbd layer's try_to_free_buffers() function to release them.
 708  */
 709 static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
 710                                  gfp_t wait)
 711 {
 712         journal_t *journal = EXT3_SB(sb)->s_journal;
 713
 714         WARN_ON(PageChecked(page));
 715         if (!page_has_buffers(page))
 716                 return 0;
 717         if (journal)
 718                 return journal_try_to_free_buffers(journal, page,
 719                                                    wait & ~__GFP_WAIT);
 720         return try_to_free_buffers(page);
 721 }
 722
 723 #ifdef CONFIG_QUOTA
 724 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
 725 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
 726
 727 static int ext3_write_dquot(struct dquot *dquot);
 728 static int ext3_acquire_dquot(struct dquot *dquot);
 729 static int ext3_release_dquot(struct dquot *dquot);
 730 static int ext3_mark_dquot_dirty(struct dquot *dquot);
 731 static int ext3_write_info(struct super_block *sb, int type);
 732 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
 733                                 char *path);
 734 static int ext3_quota_on_mount(struct super_block *sb, int type);
 735 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
 736                                size_t len, loff_t off);
 737 static ssize_t ext3_quota_write(struct super_block *sb, int type,
 738                                 const char *data, size_t len, loff_t off);
 739
 740 static const struct dquot_operations ext3_quota_operations = {
 741         .write_dquot    = ext3_write_dquot,
 742         .acquire_dquot  = ext3_acquire_dquot,
 743         .release_dquot  = ext3_release_dquot,
 744         .mark_dirty     = ext3_mark_dquot_dirty,
 745         .write_info     = ext3_write_info,
 746         .alloc_dquot    = dquot_alloc,
 747         .destroy_dquot  = dquot_destroy,
 748 };
 749
 750 static const struct quotactl_ops ext3_qctl_operations = {
 751         .quota_on       = ext3_quota_on,
 752         .quota_off      = dquot_quota_off,
 753         .quota_sync     = dquot_quota_sync,
 754         .get_info       = dquot_get_dqinfo,
 755         .set_info       = dquot_set_dqinfo,
 756         .get_dqblk      = dquot_get_dqblk,
 757         .set_dqblk      = dquot_set_dqblk
 758 };
 759 #endif
 760
 761 static const struct super_operations ext3_sops = {
 762         .alloc_inode    = ext3_alloc_inode,
 763         .destroy_inode  = ext3_destroy_inode,
 764         .write_inode    = ext3_write_inode,
 765         .dirty_inode    = ext3_dirty_inode,
 766         .evict_inode    = ext3_evict_inode,
 767         .put_super      = ext3_put_super,
 768         .sync_fs        = ext3_sync_fs,
 769         .freeze_fs      = ext3_freeze,
 770         .unfreeze_fs    = ext3_unfreeze,
 771         .statfs         = ext3_statfs,
 772         .remount_fs     = ext3_remount,
 773         .show_options   = ext3_show_options,
 774 #ifdef CONFIG_QUOTA
 775         .quota_read     = ext3_quota_read,
 776         .quota_write    = ext3_quota_write,
 777 #endif
 778         .bdev_try_to_free_page = bdev_try_to_free_page,
 779 };
 780
 781 static const struct export_operations ext3_export_ops = {
 782         .fh_to_dentry = ext3_fh_to_dentry,
 783         .fh_to_parent = ext3_fh_to_parent,
 784         .get_parent = ext3_get_parent,
 785 };
 786
 787 enum {
 788         Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
 789         Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
 790         Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
 791         Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
 792         Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
 793         Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
 794         Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
 795         Opt_data_err_abort, Opt_data_err_ignore,
 796         Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
 797         Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
 798         Opt_noquota, Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err,
 799         Opt_resize, Opt_usrquota, Opt_grpquota
 800 };
 801
 802 static const match_table_t tokens = {
 803         {Opt_bsd_df, "bsddf"},
 804         {Opt_minix_df, "minixdf"},
 805         {Opt_grpid, "grpid"},
 806         {Opt_grpid, "bsdgroups"},
 807         {Opt_nogrpid, "nogrpid"},
 808         {Opt_nogrpid, "sysvgroups"},
 809         {Opt_resgid, "resgid=%u"},
 810         {Opt_resuid, "resuid=%u"},
 811         {Opt_sb, "sb=%u"},
 812         {Opt_err_cont, "errors=continue"},
 813         {Opt_err_panic, "errors=panic"},
 814         {Opt_err_ro, "errors=remount-ro"},
 815         {Opt_nouid32, "nouid32"},
 816         {Opt_nocheck, "nocheck"},
 817         {Opt_nocheck, "check=none"},
 818         {Opt_debug, "debug"},
 819         {Opt_oldalloc, "oldalloc"},
 820         {Opt_orlov, "orlov"},
 821         {Opt_user_xattr, "user_xattr"},
 822         {Opt_nouser_xattr, "nouser_xattr"},
 823         {Opt_acl, "acl"},
 824         {Opt_noacl, "noacl"},
 825         {Opt_reservation, "reservation"},
 826         {Opt_noreservation, "noreservation"},
 827         {Opt_noload, "noload"},
 828         {Opt_noload, "norecovery"},
 829         {Opt_nobh, "nobh"},
 830         {Opt_bh, "bh"},
 831         {Opt_commit, "commit=%u"},
 832         {Opt_journal_update, "journal=update"},
 833         {Opt_journal_inum, "journal=%u"},
 834         {Opt_journal_dev, "journal_dev=%u"},
 835         {Opt_abort, "abort"},
 836         {Opt_data_journal, "data=journal"},
 837         {Opt_data_ordered, "data=ordered"},
 838         {Opt_data_writeback, "data=writeback"},
 839         {Opt_data_err_abort, "data_err=abort"},
 840         {Opt_data_err_ignore, "data_err=ignore"},
 841         {Opt_offusrjquota, "usrjquota="},
 842         {Opt_usrjquota, "usrjquota=%s"},
 843         {Opt_offgrpjquota, "grpjquota="},
 844         {Opt_grpjquota, "grpjquota=%s"},
 845         {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
 846         {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
 847         {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
 848         {Opt_grpquota, "grpquota"},
 849         {Opt_noquota, "noquota"},
 850         {Opt_quota, "quota"},
 851         {Opt_usrquota, "usrquota"},
 852         {Opt_barrier, "barrier=%u"},
 853         {Opt_barrier, "barrier"},
 854         {Opt_nobarrier, "nobarrier"},
 855         {Opt_resize, "resize"},
 856         {Opt_err, NULL},
 857 };
 858
 859 static ext3_fsblk_t get_sb_block(void **data, struct super_block *sb)
 860 {
 861         ext3_fsblk_t    sb_block;
 862         char            *options = (char *) *data;
 863
 864         if (!options || strncmp(options, "sb=", 3) != 0)
 865                 return 1;       /* Default location */
 866         options += 3;
 867         /*todo: use simple_strtoll with >32bit ext3 */
 868         sb_block = simple_strtoul(options, &options, 0);
 869         if (*options && *options != ',') {
 870                 ext3_msg(sb, "error: invalid sb specification: %s",
 871                        (char *) *data);
 872                 return 1;
 873         }
 874         if (*options == ',')
 875                 options++;
 876         *data = (void *) options;
 877         return sb_block;
 878 }
 879
 880 #ifdef CONFIG_QUOTA
 881 static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
 882 {
 883         struct ext3_sb_info *sbi = EXT3_SB(sb);
 884         char *qname;
 885
 886         if (sb_any_quota_loaded(sb) &&
 887                 !sbi->s_qf_names[qtype]) {
 888                 ext3_msg(sb, KERN_ERR,
 889                         "Cannot change journaled "
 890                         "quota options when quota turned on");
 891                 return 0;
 892         }
 893         qname = match_strdup(args);
 894         if (!qname) {
 895                 ext3_msg(sb, KERN_ERR,
 896                         "Not enough memory for storing quotafile name");
 897                 return 0;
 898         }
 899         if (sbi->s_qf_names[qtype] &&
 900                 strcmp(sbi->s_qf_names[qtype], qname)) {
 901                 ext3_msg(sb, KERN_ERR,
 902                         "%s quota file already specified", QTYPE2NAME(qtype));
 903                 kfree(qname);
 904                 return 0;
 905         }
 906         sbi->s_qf_names[qtype] = qname;
 907         if (strchr(sbi->s_qf_names[qtype], '/')) {
 908                 ext3_msg(sb, KERN_ERR,
 909                         "quotafile must be on filesystem root");
 910                 kfree(sbi->s_qf_names[qtype]);
 911                 sbi->s_qf_names[qtype] = NULL;
 912                 return 0;
 913         }
 914         set_opt(sbi->s_mount_opt, QUOTA);
 915         return 1;
 916 }
 917
 918 static int clear_qf_name(struct super_block *sb, int qtype) {
 919
 920         struct ext3_sb_info *sbi = EXT3_SB(sb);
 921
 922         if (sb_any_quota_loaded(sb) &&
 923                 sbi->s_qf_names[qtype]) {
 924                 ext3_msg(sb, KERN_ERR, "Cannot change journaled quota options"
 925                         " when quota turned on");
 926                 return 0;
 927         }
 928         /*
 929          * The space will be released later when all options are confirmed
 930          * to be correct
 931          */
 932         sbi->s_qf_names[qtype] = NULL;
 933         return 1;
 934 }
 935 #endif
 936
 937 static int parse_options (char *options, struct super_block *sb,
 938                           unsigned int *inum, unsigned long *journal_devnum,
 939                           ext3_fsblk_t *n_blocks_count, int is_remount)
 940 {
 941         struct ext3_sb_info *sbi = EXT3_SB(sb);
 942         char * p;
 943         substring_t args[MAX_OPT_ARGS];
 944         int data_opt = 0;
 945         int option;
 946 #ifdef CONFIG_QUOTA
 947         int qfmt;
 948 #endif
 949
 950         if (!options)
 951                 return 1;
 952
 953         while ((p = strsep (&options, ",")) != NULL) {
 954                 int token;
 955                 if (!*p)
 956                         continue;
 957                 /*
 958                  * Initialize args struct so we know whether arg was
 959                  * found; some options take optional arguments.
 960                  */
 961                 args[0].to = args[0].from = 0;
 962                 token = match_token(p, tokens, args);
 963                 switch (token) {
 964                 case Opt_bsd_df:
 965                         clear_opt (sbi->s_mount_opt, MINIX_DF);
 966                         break;
 967                 case Opt_minix_df:
 968                         set_opt (sbi->s_mount_opt, MINIX_DF);
 969                         break;
 970                 case Opt_grpid:
 971                         set_opt (sbi->s_mount_opt, GRPID);
 972                         break;
 973                 case Opt_nogrpid:
 974                         clear_opt (sbi->s_mount_opt, GRPID);
 975                         break;
 976                 case Opt_resuid:
 977                         if (match_int(&args[0], &option))
 978                                 return 0;
 979                         sbi->s_resuid = option;
 980                         break;
 981                 case Opt_resgid:
 982                         if (match_int(&args[0], &option))
 983                                 return 0;
 984                         sbi->s_resgid = option;
 985                         break;
 986                 case Opt_sb:
 987                         /* handled by get_sb_block() instead of here */
 988                         /* *sb_block = match_int(&args[0]); */
 989                         break;
 990                 case Opt_err_panic:
 991                         clear_opt (sbi->s_mount_opt, ERRORS_CONT);
 992                         clear_opt (sbi->s_mount_opt, ERRORS_RO);
 993                         set_opt (sbi->s_mount_opt, ERRORS_PANIC);
 994                         break;
 995                 case Opt_err_ro:
 996                         clear_opt (sbi->s_mount_opt, ERRORS_CONT);
 997                         clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
 998                         set_opt (sbi->s_mount_opt, ERRORS_RO);
 999                         break;
1000                 case Opt_err_cont:
1001                         clear_opt (sbi->s_mount_opt, ERRORS_RO);
1002                         clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1003                         set_opt (sbi->s_mount_opt, ERRORS_CONT);
1004                         break;
1005                 case Opt_nouid32:
1006                         set_opt (sbi->s_mount_opt, NO_UID32);
1007                         break;
1008                 case Opt_nocheck:
1009                         clear_opt (sbi->s_mount_opt, CHECK);
1010                         break;
1011                 case Opt_debug:
1012                         set_opt (sbi->s_mount_opt, DEBUG);
1013                         break;
1014                 case Opt_oldalloc:
1015                         set_opt (sbi->s_mount_opt, OLDALLOC);
1016                         break;
1017                 case Opt_orlov:
1018                         clear_opt (sbi->s_mount_opt, OLDALLOC);
1019                         break;
1020 #ifdef CONFIG_EXT3_FS_XATTR
1021                 case Opt_user_xattr:
1022                         set_opt (sbi->s_mount_opt, XATTR_USER);
1023                         break;
1024                 case Opt_nouser_xattr:
1025                         clear_opt (sbi->s_mount_opt, XATTR_USER);
1026                         break;
1027 #else
1028                 case Opt_user_xattr:
1029                 case Opt_nouser_xattr:
1030                         ext3_msg(sb, KERN_INFO,
1031                                 "(no)user_xattr options not supported");
1032                         break;
1033 #endif
1034 #ifdef CONFIG_EXT3_FS_POSIX_ACL
1035                 case Opt_acl:
1036                         set_opt(sbi->s_mount_opt, POSIX_ACL);
1037                         break;
1038                 case Opt_noacl:
1039                         clear_opt(sbi->s_mount_opt, POSIX_ACL);
1040                         break;
1041 #else
1042                 case Opt_acl:
1043                 case Opt_noacl:
1044                         ext3_msg(sb, KERN_INFO,
1045                                 "(no)acl options not supported");
1046                         break;
1047 #endif
1048                 case Opt_reservation:
1049                         set_opt(sbi->s_mount_opt, RESERVATION);
1050                         break;
1051                 case Opt_noreservation:
1052                         clear_opt(sbi->s_mount_opt, RESERVATION);
1053                         break;
1054                 case Opt_journal_update:
1055                         /* @@@ FIXME */
1056                         /* Eventually we will want to be able to create
1057                            a journal file here.  For now, only allow the
1058                            user to specify an existing inode to be the
1059                            journal file. */
1060                         if (is_remount) {
1061                                 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1062                                         "journal on remount");
1063                                 return 0;
1064                         }
1065                         set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
1066                         break;
1067                 case Opt_journal_inum:
1068                         if (is_remount) {
1069                                 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1070                                        "journal on remount");
1071                                 return 0;
1072                         }
1073                         if (match_int(&args[0], &option))
1074                                 return 0;
1075                         *inum = option;
1076                         break;
1077                 case Opt_journal_dev:
1078                         if (is_remount) {
1079                                 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1080                                        "journal on remount");
1081                                 return 0;
1082                         }
1083                         if (match_int(&args[0], &option))
1084                                 return 0;
1085                         *journal_devnum = option;
1086                         break;
1087                 case Opt_noload:
1088                         set_opt (sbi->s_mount_opt, NOLOAD);
1089                         break;
1090                 case Opt_commit:
1091                         if (match_int(&args[0], &option))
1092                                 return 0;
1093                         if (option < 0)
1094                                 return 0;
1095                         if (option == 0)
1096                                 option = JBD_DEFAULT_MAX_COMMIT_AGE;
1097                         sbi->s_commit_interval = HZ * option;
1098                         break;
1099                 case Opt_data_journal:
1100                         data_opt = EXT3_MOUNT_JOURNAL_DATA;
1101                         goto datacheck;
1102                 case Opt_data_ordered:
1103                         data_opt = EXT3_MOUNT_ORDERED_DATA;
1104                         goto datacheck;
1105                 case Opt_data_writeback:
1106                         data_opt = EXT3_MOUNT_WRITEBACK_DATA;
1107                 datacheck:
1108                         if (is_remount) {
1109                                 if (test_opt(sb, DATA_FLAGS) == data_opt)
1110                                         break;
1111                                 ext3_msg(sb, KERN_ERR,
1112                                         "error: cannot change "
1113                                         "data mode on remount. The filesystem "
1114                                         "is mounted in data=%s mode and you "
1115                                         "try to remount it in data=%s mode.",
1116                                         data_mode_string(test_opt(sb,
1117                                                         DATA_FLAGS)),
1118                                         data_mode_string(data_opt));
1119                                 return 0;
1120                         } else {
1121                                 clear_opt(sbi->s_mount_opt, DATA_FLAGS);
1122                                 sbi->s_mount_opt |= data_opt;
1123                         }
1124                         break;
1125                 case Opt_data_err_abort:
1126                         set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1127                         break;
1128                 case Opt_data_err_ignore:
1129                         clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1130                         break;
1131 #ifdef CONFIG_QUOTA
1132                 case Opt_usrjquota:
1133                         if (!set_qf_name(sb, USRQUOTA, &args[0]))
1134                                 return 0;
1135                         break;
1136                 case Opt_grpjquota:
1137                         if (!set_qf_name(sb, GRPQUOTA, &args[0]))
1138                                 return 0;
1139                         break;
1140                 case Opt_offusrjquota:
1141                         if (!clear_qf_name(sb, USRQUOTA))
1142                                 return 0;
1143                         break;
1144                 case Opt_offgrpjquota:
1145                         if (!clear_qf_name(sb, GRPQUOTA))
1146                                 return 0;
1147                         break;
1148                 case Opt_jqfmt_vfsold:
1149                         qfmt = QFMT_VFS_OLD;
1150                         goto set_qf_format;
1151                 case Opt_jqfmt_vfsv0:
1152                         qfmt = QFMT_VFS_V0;
1153                         goto set_qf_format;
1154                 case Opt_jqfmt_vfsv1:
1155                         qfmt = QFMT_VFS_V1;
1156 set_qf_format:
1157                         if (sb_any_quota_loaded(sb) &&
1158                             sbi->s_jquota_fmt != qfmt) {
1159                                 ext3_msg(sb, KERN_ERR, "error: cannot change "
1160                                         "journaled quota options when "
1161                                         "quota turned on.");
1162                                 return 0;
1163                         }
1164                         sbi->s_jquota_fmt = qfmt;
1165                         break;
1166                 case Opt_quota:
1167                 case Opt_usrquota:
1168                         set_opt(sbi->s_mount_opt, QUOTA);
1169                         set_opt(sbi->s_mount_opt, USRQUOTA);
1170                         break;
1171                 case Opt_grpquota:
1172                         set_opt(sbi->s_mount_opt, QUOTA);
1173                         set_opt(sbi->s_mount_opt, GRPQUOTA);
1174                         break;
1175                 case Opt_noquota:
1176                         if (sb_any_quota_loaded(sb)) {
1177                                 ext3_msg(sb, KERN_ERR, "error: cannot change "
1178                                         "quota options when quota turned on.");
1179                                 return 0;
1180                         }
1181                         clear_opt(sbi->s_mount_opt, QUOTA);
1182                         clear_opt(sbi->s_mount_opt, USRQUOTA);
1183                         clear_opt(sbi->s_mount_opt, GRPQUOTA);
1184                         break;
1185 #else
1186                 case Opt_quota:
1187                 case Opt_usrquota:
1188                 case Opt_grpquota:
1189                         ext3_msg(sb, KERN_ERR,
1190                                 "error: quota options not supported.");
1191                         break;
1192                 case Opt_usrjquota:
1193                 case Opt_grpjquota:
1194                 case Opt_offusrjquota:
1195                 case Opt_offgrpjquota:
1196                 case Opt_jqfmt_vfsold:
1197                 case Opt_jqfmt_vfsv0:
1198                 case Opt_jqfmt_vfsv1:
1199                         ext3_msg(sb, KERN_ERR,
1200                                 "error: journaled quota options not "
1201                                 "supported.");
1202                         break;
1203                 case Opt_noquota:
1204                         break;
1205 #endif
1206                 case Opt_abort:
1207                         set_opt(sbi->s_mount_opt, ABORT);
1208                         break;
1209                 case Opt_nobarrier:
1210                         clear_opt(sbi->s_mount_opt, BARRIER);
1211                         break;
1212                 case Opt_barrier:
1213                         if (args[0].from) {
1214                                 if (match_int(&args[0], &option))
1215                                         return 0;
1216                         } else
1217                                 option = 1;     /* No argument, default to 1 */
1218                         if (option)
1219                                 set_opt(sbi->s_mount_opt, BARRIER);
1220                         else
1221                                 clear_opt(sbi->s_mount_opt, BARRIER);
1222                         break;
1223                 case Opt_ignore:
1224                         break;
1225                 case Opt_resize:
1226                         if (!is_remount) {
1227                                 ext3_msg(sb, KERN_ERR,
1228                                         "error: resize option only available "
1229                                         "for remount");
1230                                 return 0;
1231                         }
1232                         if (match_int(&args[0], &option) != 0)
1233                                 return 0;
1234                         *n_blocks_count = option;
1235                         break;
1236                 case Opt_nobh:
1237                         ext3_msg(sb, KERN_WARNING,
1238                                 "warning: ignoring deprecated nobh option");
1239                         break;
1240                 case Opt_bh:
1241                         ext3_msg(sb, KERN_WARNING,
1242                                 "warning: ignoring deprecated bh option");
1243                         break;
1244                 default:
1245                         ext3_msg(sb, KERN_ERR,
1246                                 "error: unrecognized mount option \"%s\" "
1247                                 "or missing value", p);
1248                         return 0;
1249                 }
1250         }
1251 #ifdef CONFIG_QUOTA
1252         if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1253                 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
1254                         clear_opt(sbi->s_mount_opt, USRQUOTA);
1255                 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
1256                         clear_opt(sbi->s_mount_opt, GRPQUOTA);
1257
1258                 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
1259                         ext3_msg(sb, KERN_ERR, "error: old and new quota "
1260                                         "format mixing.");
1261                         return 0;
1262                 }
1263
1264                 if (!sbi->s_jquota_fmt) {
1265                         ext3_msg(sb, KERN_ERR, "error: journaled quota format "
1266                                         "not specified.");
1267                         return 0;
1268                 }
1269         } else {
1270                 if (sbi->s_jquota_fmt) {
1271                         ext3_msg(sb, KERN_ERR, "error: journaled quota format "
1272                                         "specified with no journaling "
1273                                         "enabled.");
1274                         return 0;
1275                 }
1276         }
1277 #endif
1278         return 1;
1279 }
1280
1281 static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1282                             int read_only)
1283 {
1284         struct ext3_sb_info *sbi = EXT3_SB(sb);
1285         int res = 0;
1286
1287         if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
1288                 ext3_msg(sb, KERN_ERR,
1289                         "error: revision level too high, "
1290                         "forcing read-only mode");
1291                 res = MS_RDONLY;
1292         }
1293         if (read_only)
1294                 return res;
1295         if (!(sbi->s_mount_state & EXT3_VALID_FS))
1296                 ext3_msg(sb, KERN_WARNING,
1297                         "warning: mounting unchecked fs, "
1298                         "running e2fsck is recommended");
1299         else if ((sbi->s_mount_state & EXT3_ERROR_FS))
1300                 ext3_msg(sb, KERN_WARNING,
1301                         "warning: mounting fs with errors, "
1302                         "running e2fsck is recommended");
1303         else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
1304                  le16_to_cpu(es->s_mnt_count) >=
1305                         le16_to_cpu(es->s_max_mnt_count))
1306                 ext3_msg(sb, KERN_WARNING,
1307                         "warning: maximal mount count reached, "
1308                         "running e2fsck is recommended");
1309         else if (le32_to_cpu(es->s_checkinterval) &&
1310                 (le32_to_cpu(es->s_lastcheck) +
1311                         le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1312                 ext3_msg(sb, KERN_WARNING,
1313                         "warning: checktime reached, "
1314                         "running e2fsck is recommended");
1315 #if 0
1316                 /* @@@ We _will_ want to clear the valid bit if we find
1317                    inconsistencies, to force a fsck at reboot.  But for
1318                    a plain journaled filesystem we can keep it set as
1319                    valid forever! :) */
1320         es->s_state &= cpu_to_le16(~EXT3_VALID_FS);
1321 #endif
1322         if (!le16_to_cpu(es->s_max_mnt_count))
1323                 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
1324         le16_add_cpu(&es->s_mnt_count, 1);
1325         es->s_mtime = cpu_to_le32(get_seconds());
1326         ext3_update_dynamic_rev(sb);
1327         EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1328
1329         ext3_commit_super(sb, es, 1);
1330         if (test_opt(sb, DEBUG))
1331                 ext3_msg(sb, KERN_INFO, "[bs=%lu, gc=%lu, "
1332                                 "bpg=%lu, ipg=%lu, mo=%04lx]",
1333                         sb->s_blocksize,
1334                         sbi->s_groups_count,
1335                         EXT3_BLOCKS_PER_GROUP(sb),
1336                         EXT3_INODES_PER_GROUP(sb),
1337                         sbi->s_mount_opt);
1338
1339         if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1340                 char b[BDEVNAME_SIZE];
1341                 ext3_msg(sb, KERN_INFO, "using external journal on %s",
1342                         bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1343         } else {
1344                 ext3_msg(sb, KERN_INFO, "using internal journal");
1345         }
1346         return res;
1347 }
1348
1349 /* Called at mount-time, super-block is locked */
1350 static int ext3_check_descriptors(struct super_block *sb)
1351 {
1352         struct ext3_sb_info *sbi = EXT3_SB(sb);
1353         int i;
1354
1355         ext3_debug ("Checking group descriptors");
1356
1357         for (i = 0; i < sbi->s_groups_count; i++) {
1358                 struct ext3_group_desc *gdp = ext3_get_group_desc(sb, i, NULL);
1359                 ext3_fsblk_t first_block = ext3_group_first_block_no(sb, i);
1360                 ext3_fsblk_t last_block;
1361
1362                 if (i == sbi->s_groups_count - 1)
1363                         last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
1364                 else
1365                         last_block = first_block +
1366                                 (EXT3_BLOCKS_PER_GROUP(sb) - 1);
1367
1368                 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
1369                     le32_to_cpu(gdp->bg_block_bitmap) > last_block)
1370                 {
1371                         ext3_error (sb, "ext3_check_descriptors",
1372                                     "Block bitmap for group %d"
1373                                     " not in group (block %lu)!",
1374                                     i, (unsigned long)
1375                                         le32_to_cpu(gdp->bg_block_bitmap));
1376                         return 0;
1377                 }
1378                 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
1379                     le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
1380                 {
1381                         ext3_error (sb, "ext3_check_descriptors",
1382                                     "Inode bitmap for group %d"
1383                                     " not in group (block %lu)!",
1384                                     i, (unsigned long)
1385                                         le32_to_cpu(gdp->bg_inode_bitmap));
1386                         return 0;
1387                 }
1388                 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
1389                     le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
1390                     last_block)
1391                 {
1392                         ext3_error (sb, "ext3_check_descriptors",
1393                                     "Inode table for group %d"
1394                                     " not in group (block %lu)!",
1395                                     i, (unsigned long)
1396                                         le32_to_cpu(gdp->bg_inode_table));
1397                         return 0;
1398                 }
1399         }
1400
1401         sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1402         sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1403         return 1;
1404 }
1405
1406
1407 /* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1408  * the superblock) which were deleted from all directories, but held open by
1409  * a process at the time of a crash.  We walk the list and try to delete these
1410  * inodes at recovery time (only with a read-write filesystem).
1411  *
1412  * In order to keep the orphan inode chain consistent during traversal (in
1413  * case of crash during recovery), we link each inode into the superblock
1414  * orphan list_head and handle it the same way as an inode deletion during
1415  * normal operation (which journals the operations for us).
1416  *
1417  * We only do an iget() and an iput() on each inode, which is very safe if we
1418  * accidentally point at an in-use or already deleted inode.  The worst that
1419  * can happen in this case is that we get a "bit already cleared" message from
1420  * ext3_free_inode().  The only reason we would point at a wrong inode is if
1421  * e2fsck was run on this filesystem, and it must have already done the orphan
1422  * inode cleanup for us, so we can safely abort without any further action.
1423  */
1424 static void ext3_orphan_cleanup (struct super_block * sb,
1425                                  struct ext3_super_block * es)
1426 {
1427         unsigned int s_flags = sb->s_flags;
1428         int nr_orphans = 0, nr_truncates = 0;
1429 #ifdef CONFIG_QUOTA
1430         int i;
1431 #endif
1432         if (!es->s_last_orphan) {
1433                 jbd_debug(4, "no orphan inodes to clean up\n");
1434                 return;
1435         }
1436
1437         if (bdev_read_only(sb->s_bdev)) {
1438                 ext3_msg(sb, KERN_ERR, "error: write access "
1439                         "unavailable, skipping orphan cleanup.");
1440                 return;
1441         }
1442
1443         if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1444                 if (es->s_last_orphan)
1445                         jbd_debug(1, "Errors on filesystem, "
1446                                   "clearing orphan list.\n");
1447                 es->s_last_orphan = 0;
1448                 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1449                 return;
1450         }
1451
1452         if (s_flags & MS_RDONLY) {
1453                 ext3_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
1454                 sb->s_flags &= ~MS_RDONLY;
1455         }
1456 #ifdef CONFIG_QUOTA
1457         /* Needed for iput() to work correctly and not trash data */
1458         sb->s_flags |= MS_ACTIVE;
1459         /* Turn on quotas so that they are updated correctly */
1460         for (i = 0; i < MAXQUOTAS; i++) {
1461                 if (EXT3_SB(sb)->s_qf_names[i]) {
1462                         int ret = ext3_quota_on_mount(sb, i);
1463                         if (ret < 0)
1464                                 ext3_msg(sb, KERN_ERR,
1465                                         "error: cannot turn on journaled "
1466                                         "quota: %d", ret);
1467                 }
1468         }
1469 #endif
1470
1471         while (es->s_last_orphan) {
1472                 struct inode *inode;
1473
1474                 inode = ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1475                 if (IS_ERR(inode)) {
1476                         es->s_last_orphan = 0;
1477                         break;
1478                 }
1479
1480                 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1481                 dquot_initialize(inode);
1482                 if (inode->i_nlink) {
1483                         printk(KERN_DEBUG
1484                                 "%s: truncating inode %lu to %Ld bytes\n",
1485                                 __func__, inode->i_ino, inode->i_size);
1486                         jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1487                                   inode->i_ino, inode->i_size);
1488                         ext3_truncate(inode);
1489                         nr_truncates++;
1490                 } else {
1491                         printk(KERN_DEBUG
1492                                 "%s: deleting unreferenced inode %lu\n",
1493                                 __func__, inode->i_ino);
1494                         jbd_debug(2, "deleting unreferenced inode %lu\n",
1495                                   inode->i_ino);
1496                         nr_orphans++;
1497                 }
1498                 iput(inode);  /* The delete magic happens here! */
1499         }
1500
1501 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1502
1503         if (nr_orphans)
1504                 ext3_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
1505                        PLURAL(nr_orphans));
1506         if (nr_truncates)
1507                 ext3_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
1508                        PLURAL(nr_truncates));
1509 #ifdef CONFIG_QUOTA
1510         /* Turn quotas off */
1511         for (i = 0; i < MAXQUOTAS; i++) {
1512                 if (sb_dqopt(sb)->files[i])
1513                         dquot_quota_off(sb, i);
1514         }
1515 #endif
1516         sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1517 }
1518
1519 /*
1520  * Maximal file size.  There is a direct, and {,double-,triple-}indirect
1521  * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1522  * We need to be 1 filesystem block less than the 2^32 sector limit.
1523  */
1524 static loff_t ext3_max_size(int bits)
1525 {
1526         loff_t res = EXT3_NDIR_BLOCKS;
1527         int meta_blocks;
1528         loff_t upper_limit;
1529
1530         /* This is calculated to be the largest file size for a
1531          * dense, file such that the total number of
1532          * sectors in the file, including data and all indirect blocks,
1533          * does not exceed 2^32 -1
1534          * __u32 i_blocks representing the total number of
1535          * 512 bytes blocks of the file
1536          */
1537         upper_limit = (1LL << 32) - 1;
1538
1539         /* total blocks in file system block size */
1540         upper_limit >>= (bits - 9);
1541
1542
1543         /* indirect blocks */
1544         meta_blocks = 1;
1545         /* double indirect blocks */
1546         meta_blocks += 1 + (1LL << (bits-2));
1547         /* tripple indirect blocks */
1548         meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1549
1550         upper_limit -= meta_blocks;
1551         upper_limit <<= bits;
1552
1553         res += 1LL << (bits-2);
1554         res += 1LL << (2*(bits-2));
1555         res += 1LL << (3*(bits-2));
1556         res <<= bits;
1557         if (res > upper_limit)
1558                 res = upper_limit;
1559
1560         if (res > MAX_LFS_FILESIZE)
1561                 res = MAX_LFS_FILESIZE;
1562
1563         return res;
1564 }
1565
1566 static ext3_fsblk_t descriptor_loc(struct super_block *sb,
1567                                     ext3_fsblk_t logic_sb_block,
1568                                     int nr)
1569 {
1570         struct ext3_sb_info *sbi = EXT3_SB(sb);
1571         unsigned long bg, first_meta_bg;
1572         int has_super = 0;
1573
1574         first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1575
1576         if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1577             nr < first_meta_bg)
1578                 return (logic_sb_block + nr + 1);
1579         bg = sbi->s_desc_per_block * nr;
1580         if (ext3_bg_has_super(sb, bg))
1581                 has_super = 1;
1582         return (has_super + ext3_group_first_block_no(sb, bg));
1583 }
1584
1585
1586 static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1587 {
1588         struct buffer_head * bh;
1589         struct ext3_super_block *es = NULL;
1590         struct ext3_sb_info *sbi;
1591         ext3_fsblk_t block;
1592         ext3_fsblk_t sb_block = get_sb_block(&data, sb);
1593         ext3_fsblk_t logic_sb_block;
1594         unsigned long offset = 0;
1595         unsigned int journal_inum = 0;
1596         unsigned long journal_devnum = 0;
1597         unsigned long def_mount_opts;
1598         struct inode *root;
1599         int blocksize;
1600         int hblock;
1601         int db_count;
1602         int i;
1603         int needs_recovery;
1604         int ret = -EINVAL;
1605         __le32 features;
1606         int err;
1607
1608         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1609         if (!sbi)
1610                 return -ENOMEM;
1611
1612         sbi->s_blockgroup_lock =
1613                 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
1614         if (!sbi->s_blockgroup_lock) {
1615                 kfree(sbi);
1616                 return -ENOMEM;
1617         }
1618         sb->s_fs_info = sbi;
1619         sbi->s_mount_opt = 0;
1620         sbi->s_resuid = EXT3_DEF_RESUID;
1621         sbi->s_resgid = EXT3_DEF_RESGID;
1622         sbi->s_sb_block = sb_block;
1623
1624         blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1625         if (!blocksize) {
1626                 ext3_msg(sb, KERN_ERR, "error: unable to set blocksize");
1627                 goto out_fail;
1628         }
1629
1630         /*
1631          * The ext3 superblock will not be buffer aligned for other than 1kB
1632          * block sizes.  We need to calculate the offset from buffer start.
1633          */
1634         if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1635                 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1636                 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1637         } else {
1638                 logic_sb_block = sb_block;
1639         }
1640
1641         if (!(bh = sb_bread(sb, logic_sb_block))) {
1642                 ext3_msg(sb, KERN_ERR, "error: unable to read superblock");
1643                 goto out_fail;
1644         }
1645         /*
1646          * Note: s_es must be initialized as soon as possible because
1647          *       some ext3 macro-instructions depend on its value
1648          */
1649         es = (struct ext3_super_block *) (bh->b_data + offset);
1650         sbi->s_es = es;
1651         sb->s_magic = le16_to_cpu(es->s_magic);
1652         if (sb->s_magic != EXT3_SUPER_MAGIC)
1653                 goto cantfind_ext3;
1654
1655         /* Set defaults before we parse the mount options */
1656         def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1657         if (def_mount_opts & EXT3_DEFM_DEBUG)
1658                 set_opt(sbi->s_mount_opt, DEBUG);
1659         if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1660                 set_opt(sbi->s_mount_opt, GRPID);
1661         if (def_mount_opts & EXT3_DEFM_UID16)
1662                 set_opt(sbi->s_mount_opt, NO_UID32);
1663 #ifdef CONFIG_EXT3_FS_XATTR
1664         if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1665                 set_opt(sbi->s_mount_opt, XATTR_USER);
1666 #endif
1667 #ifdef CONFIG_EXT3_FS_POSIX_ACL
1668         if (def_mount_opts & EXT3_DEFM_ACL)
1669                 set_opt(sbi->s_mount_opt, POSIX_ACL);
1670 #endif
1671         if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1672                 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1673         else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1674                 set_opt(sbi->s_mount_opt, ORDERED_DATA);
1675         else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1676                 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
1677
1678         if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1679                 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1680         else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_CONTINUE)
1681                 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1682         else
1683                 set_opt(sbi->s_mount_opt, ERRORS_RO);
1684
1685         sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1686         sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1687
1688         set_opt(sbi->s_mount_opt, RESERVATION);
1689
1690         if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1691                             NULL, 0))
1692                 goto failed_mount;
1693
1694         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1695                 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
1696
1697         if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1698             (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1699              EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1700              EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1701                 ext3_msg(sb, KERN_WARNING,
1702                         "warning: feature flags set on rev 0 fs, "
1703                         "running e2fsck is recommended");
1704         /*
1705          * Check feature flags regardless of the revision level, since we
1706          * previously didn't change the revision level when setting the flags,
1707          * so there is a chance incompat flags are set on a rev 0 filesystem.
1708          */
1709         features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1710         if (features) {
1711                 ext3_msg(sb, KERN_ERR,
1712                         "error: couldn't mount because of unsupported "
1713                         "optional features (%x)", le32_to_cpu(features));
1714                 goto failed_mount;
1715         }
1716         features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1717         if (!(sb->s_flags & MS_RDONLY) && features) {
1718                 ext3_msg(sb, KERN_ERR,
1719                         "error: couldn't mount RDWR because of unsupported "
1720                         "optional features (%x)", le32_to_cpu(features));
1721                 goto failed_mount;
1722         }
1723         blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1724
1725         if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1726             blocksize > EXT3_MAX_BLOCK_SIZE) {
1727                 ext3_msg(sb, KERN_ERR,
1728                         "error: couldn't mount because of unsupported "
1729                         "filesystem blocksize %d", blocksize);
1730                 goto failed_mount;
1731         }
1732
1733         hblock = bdev_logical_block_size(sb->s_bdev);
1734         if (sb->s_blocksize != blocksize) {
1735                 /*
1736                  * Make sure the blocksize for the filesystem is larger
1737                  * than the hardware sectorsize for the machine.
1738                  */
1739                 if (blocksize < hblock) {
1740                         ext3_msg(sb, KERN_ERR,
1741                                 "error: fsblocksize %d too small for "
1742                                 "hardware sectorsize %d", blocksize, hblock);
1743                         goto failed_mount;
1744                 }
1745
1746                 brelse (bh);
1747                 if (!sb_set_blocksize(sb, blocksize)) {
1748                         ext3_msg(sb, KERN_ERR,
1749                                 "error: bad blocksize %d", blocksize);
1750                         goto out_fail;
1751                 }
1752                 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1753                 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1754                 bh = sb_bread(sb, logic_sb_block);
1755                 if (!bh) {
1756                         ext3_msg(sb, KERN_ERR,
1757                                "error: can't read superblock on 2nd try");
1758                         goto failed_mount;
1759                 }
1760                 es = (struct ext3_super_block *)(bh->b_data + offset);
1761                 sbi->s_es = es;
1762                 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
1763                         ext3_msg(sb, KERN_ERR,
1764                                 "error: magic mismatch");
1765                         goto failed_mount;
1766                 }
1767         }
1768
1769         sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1770
1771         if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1772                 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1773                 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1774         } else {
1775                 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1776                 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1777                 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
1778                     (!is_power_of_2(sbi->s_inode_size)) ||
1779                     (sbi->s_inode_size > blocksize)) {
1780                         ext3_msg(sb, KERN_ERR,
1781                                 "error: unsupported inode size: %d",
1782                                 sbi->s_inode_size);
1783                         goto failed_mount;
1784                 }
1785         }
1786         sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1787                                    le32_to_cpu(es->s_log_frag_size);
1788         if (blocksize != sbi->s_frag_size) {
1789                 ext3_msg(sb, KERN_ERR,
1790                        "error: fragsize %lu != blocksize %u (unsupported)",
1791                        sbi->s_frag_size, blocksize);
1792                 goto failed_mount;
1793         }
1794         sbi->s_frags_per_block = 1;
1795         sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1796         sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1797         sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1798         if (EXT3_INODE_SIZE(sb) == 0 || EXT3_INODES_PER_GROUP(sb) == 0)
1799                 goto cantfind_ext3;
1800         sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1801         if (sbi->s_inodes_per_block == 0)
1802                 goto cantfind_ext3;
1803         sbi->s_itb_per_group = sbi->s_inodes_per_group /
1804                                         sbi->s_inodes_per_block;
1805         sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1806         sbi->s_sbh = bh;
1807         sbi->s_mount_state = le16_to_cpu(es->s_state);
1808         sbi->s_addr_per_block_bits = ilog2(EXT3_ADDR_PER_BLOCK(sb));
1809         sbi->s_desc_per_block_bits = ilog2(EXT3_DESC_PER_BLOCK(sb));
1810         for (i=0; i < 4; i++)
1811                 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1812         sbi->s_def_hash_version = es->s_def_hash_version;
1813         i = le32_to_cpu(es->s_flags);
1814         if (i & EXT2_FLAGS_UNSIGNED_HASH)
1815                 sbi->s_hash_unsigned = 3;
1816         else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
1817 #ifdef __CHAR_UNSIGNED__
1818                 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
1819                 sbi->s_hash_unsigned = 3;
1820 #else
1821                 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
1822 #endif
1823         }
1824
1825         if (sbi->s_blocks_per_group > blocksize * 8) {
1826                 ext3_msg(sb, KERN_ERR,
1827                         "#blocks per group too big: %lu",
1828                         sbi->s_blocks_per_group);
1829                 goto failed_mount;
1830         }
1831         if (sbi->s_frags_per_group > blocksize * 8) {
1832                 ext3_msg(sb, KERN_ERR,
1833                         "error: #fragments per group too big: %lu",
1834                         sbi->s_frags_per_group);
1835                 goto failed_mount;
1836         }
1837         if (sbi->s_inodes_per_group > blocksize * 8) {
1838                 ext3_msg(sb, KERN_ERR,
1839                         "error: #inodes per group too big: %lu",
1840                         sbi->s_inodes_per_group);
1841                 goto failed_mount;
1842         }
1843
1844         if (generic_check_addressable(sb->s_blocksize_bits,
1845                                       le32_to_cpu(es->s_blocks_count))) {
1846                 ext3_msg(sb, KERN_ERR,
1847                         "error: filesystem is too large to mount safely");
1848                 if (sizeof(sector_t) < 8)
1849                         ext3_msg(sb, KERN_ERR,
1850                                 "error: CONFIG_LBDAF not enabled");
1851                 goto failed_mount;
1852         }
1853
1854         if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1855                 goto cantfind_ext3;
1856         sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1857                                le32_to_cpu(es->s_first_data_block) - 1)
1858                                        / EXT3_BLOCKS_PER_GROUP(sb)) + 1;
1859         db_count = DIV_ROUND_UP(sbi->s_groups_count, EXT3_DESC_PER_BLOCK(sb));
1860         sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1861                                     GFP_KERNEL);
1862         if (sbi->s_group_desc == NULL) {
1863                 ext3_msg(sb, KERN_ERR,
1864                         "error: not enough memory");
1865                 ret = -ENOMEM;
1866                 goto failed_mount;
1867         }
1868
1869         bgl_lock_init(sbi->s_blockgroup_lock);
1870
1871         for (i = 0; i < db_count; i++) {
1872                 block = descriptor_loc(sb, logic_sb_block, i);
1873                 sbi->s_group_desc[i] = sb_bread(sb, block);
1874                 if (!sbi->s_group_desc[i]) {
1875                         ext3_msg(sb, KERN_ERR,
1876                                 "error: can't read group descriptor %d", i);
1877                         db_count = i;
1878                         goto failed_mount2;
1879                 }
1880         }
1881         if (!ext3_check_descriptors (sb)) {
1882                 ext3_msg(sb, KERN_ERR,
1883                         "error: group descriptors corrupted");
1884                 goto failed_mount2;
1885         }
1886         sbi->s_gdb_count = db_count;
1887         get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1888         spin_lock_init(&sbi->s_next_gen_lock);
1889
1890         /* per fileystem reservation list head & lock */
1891         spin_lock_init(&sbi->s_rsv_window_lock);
1892         sbi->s_rsv_window_root = RB_ROOT;
1893         /* Add a single, static dummy reservation to the start of the
1894          * reservation window list --- it gives us a placeholder for
1895          * append-at-start-of-list which makes the allocation logic
1896          * _much_ simpler. */
1897         sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1898         sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1899         sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1900         sbi->s_rsv_window_head.rsv_goal_size = 0;
1901         ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1902
1903         /*
1904          * set up enough so that it can read an inode
1905          */
1906         sb->s_op = &ext3_sops;
1907         sb->s_export_op = &ext3_export_ops;
1908         sb->s_xattr = ext3_xattr_handlers;
1909 #ifdef CONFIG_QUOTA
1910         sb->s_qcop = &ext3_qctl_operations;
1911         sb->dq_op = &ext3_quota_operations;
1912 #endif
1913         INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1914         mutex_init(&sbi->s_orphan_lock);
1915         mutex_init(&sbi->s_resize_lock);
1916
1917         sb->s_root = NULL;
1918
1919         needs_recovery = (es->s_last_orphan != 0 ||
1920                           EXT3_HAS_INCOMPAT_FEATURE(sb,
1921                                     EXT3_FEATURE_INCOMPAT_RECOVER));
1922
1923         /*
1924          * The first inode we look at is the journal inode.  Don't try
1925          * root first: it may be modified in the journal!
1926          */
1927         if (!test_opt(sb, NOLOAD) &&
1928             EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
1929                 if (ext3_load_journal(sb, es, journal_devnum))
1930                         goto failed_mount2;
1931         } else if (journal_inum) {
1932                 if (ext3_create_journal(sb, es, journal_inum))
1933                         goto failed_mount2;
1934         } else {
1935                 if (!silent)
1936                         ext3_msg(sb, KERN_ERR,
1937                                 "error: no journal found. "
1938                                 "mounting ext3 over ext2?");
1939                 goto failed_mount2;
1940         }
1941         err = percpu_counter_init(&sbi->s_freeblocks_counter,
1942                         ext3_count_free_blocks(sb));
1943         if (!err) {
1944                 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1945                                 ext3_count_free_inodes(sb));
1946         }
1947         if (!err) {
1948                 err = percpu_counter_init(&sbi->s_dirs_counter,
1949                                 ext3_count_dirs(sb));
1950         }
1951         if (err) {
1952                 ext3_msg(sb, KERN_ERR, "error: insufficient memory");
1953                 ret = err;
1954                 goto failed_mount3;
1955         }
1956
1957         /* We have now updated the journal if required, so we can
1958          * validate the data journaling mode. */
1959         switch (test_opt(sb, DATA_FLAGS)) {
1960         case 0:
1961                 /* No mode set, assume a default based on the journal
1962                    capabilities: ORDERED_DATA if the journal can
1963                    cope, else JOURNAL_DATA */
1964                 if (journal_check_available_features
1965                     (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
1966                         set_opt(sbi->s_mount_opt, DEFAULT_DATA_MODE);
1967                 else
1968                         set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1969                 break;
1970
1971         case EXT3_MOUNT_ORDERED_DATA:
1972         case EXT3_MOUNT_WRITEBACK_DATA:
1973                 if (!journal_check_available_features
1974                     (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
1975                         ext3_msg(sb, KERN_ERR,
1976                                 "error: journal does not support "
1977                                 "requested data journaling mode");
1978                         goto failed_mount3;
1979                 }
1980         default:
1981                 break;
1982         }
1983
1984         /*
1985          * The journal_load will have done any necessary log recovery,
1986          * so we can safely mount the rest of the filesystem now.
1987          */
1988
1989         root = ext3_iget(sb, EXT3_ROOT_INO);
1990         if (IS_ERR(root)) {
1991                 ext3_msg(sb, KERN_ERR, "error: get root inode failed");
1992                 ret = PTR_ERR(root);
1993                 goto failed_mount3;
1994         }
1995         if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1996                 iput(root);
1997                 ext3_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck");
1998                 goto failed_mount3;
1999         }
2000         sb->s_root = d_alloc_root(root);
2001         if (!sb->s_root) {
2002                 ext3_msg(sb, KERN_ERR, "error: get root dentry failed");
2003                 iput(root);
2004                 ret = -ENOMEM;
2005                 goto failed_mount3;
2006         }
2007
2008         ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
2009
2010         EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
2011         ext3_orphan_cleanup(sb, es);
2012         EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
2013         if (needs_recovery)
2014                 ext3_msg(sb, KERN_INFO, "recovery complete");
2015         ext3_mark_recovery_complete(sb, es);
2016         ext3_msg(sb, KERN_INFO, "mounted filesystem with %s data mode",
2017                 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
2018                 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
2019                 "writeback");
2020
2021         return 0;
2022
2023 cantfind_ext3:
2024         if (!silent)
2025                 ext3_msg(sb, KERN_INFO,
2026                         "error: can't find ext3 filesystem on dev %s.",
2027                        sb->s_id);
2028         goto failed_mount;
2029
2030 failed_mount3:
2031         percpu_counter_destroy(&sbi->s_freeblocks_counter);
2032         percpu_counter_destroy(&sbi->s_freeinodes_counter);
2033         percpu_counter_destroy(&sbi->s_dirs_counter);
2034         journal_destroy(sbi->s_journal);
2035 failed_mount2:
2036         for (i = 0; i < db_count; i++)
2037                 brelse(sbi->s_group_desc[i]);
2038         kfree(sbi->s_group_desc);
2039 failed_mount:
2040 #ifdef CONFIG_QUOTA
2041         for (i = 0; i < MAXQUOTAS; i++)
2042                 kfree(sbi->s_qf_names[i]);
2043 #endif
2044         ext3_blkdev_remove(sbi);
2045         brelse(bh);
2046 out_fail:
2047         sb->s_fs_info = NULL;
2048         kfree(sbi->s_blockgroup_lock);
2049         kfree(sbi);
2050         return ret;
2051 }
2052
2053 /*
2054  * Setup any per-fs journal parameters now.  We'll do this both on
2055  * initial mount, once the journal has been initialised but before we've
2056  * done any recovery; and again on any subsequent remount.
2057  */
2058 static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
2059 {
2060         struct ext3_sb_info *sbi = EXT3_SB(sb);
2061
2062         if (sbi->s_commit_interval)
2063                 journal->j_commit_interval = sbi->s_commit_interval;
2064         /* We could also set up an ext3-specific default for the commit
2065          * interval here, but for now we'll just fall back to the jbd
2066          * default. */
2067
2068         spin_lock(&journal->j_state_lock);
2069         if (test_opt(sb, BARRIER))
2070                 journal->j_flags |= JFS_BARRIER;
2071         else
2072                 journal->j_flags &= ~JFS_BARRIER;
2073         if (test_opt(sb, DATA_ERR_ABORT))
2074                 journal->j_flags |= JFS_ABORT_ON_SYNCDATA_ERR;
2075         else
2076                 journal->j_flags &= ~JFS_ABORT_ON_SYNCDATA_ERR;
2077         spin_unlock(&journal->j_state_lock);
2078 }
2079
2080 static journal_t *ext3_get_journal(struct super_block *sb,
2081                                    unsigned int journal_inum)
2082 {
2083         struct inode *journal_inode;
2084         journal_t *journal;
2085
2086         /* First, test for the existence of a valid inode on disk.  Bad
2087          * things happen if we iget() an unused inode, as the subsequent
2088          * iput() will try to delete it. */
2089
2090         journal_inode = ext3_iget(sb, journal_inum);
2091         if (IS_ERR(journal_inode)) {
2092                 ext3_msg(sb, KERN_ERR, "error: no journal found");
2093                 return NULL;
2094         }
2095         if (!journal_inode->i_nlink) {
2096                 make_bad_inode(journal_inode);
2097                 iput(journal_inode);
2098                 ext3_msg(sb, KERN_ERR, "error: journal inode is deleted");
2099                 return NULL;
2100         }
2101
2102         jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2103                   journal_inode, journal_inode->i_size);
2104         if (!S_ISREG(journal_inode->i_mode)) {
2105                 ext3_msg(sb, KERN_ERR, "error: invalid journal inode");
2106                 iput(journal_inode);
2107                 return NULL;
2108         }
2109
2110         journal = journal_init_inode(journal_inode);
2111         if (!journal) {
2112                 ext3_msg(sb, KERN_ERR, "error: could not load journal inode");
2113                 iput(journal_inode);
2114                 return NULL;
2115         }
2116         journal->j_private = sb;
2117         ext3_init_journal_params(sb, journal);
2118         return journal;
2119 }
2120
2121 static journal_t *ext3_get_dev_journal(struct super_block *sb,
2122                                        dev_t j_dev)
2123 {
2124         struct buffer_head * bh;
2125         journal_t *journal;
2126         ext3_fsblk_t start;
2127         ext3_fsblk_t len;
2128         int hblock, blocksize;
2129         ext3_fsblk_t sb_block;
2130         unsigned long offset;
2131         struct ext3_super_block * es;
2132         struct block_device *bdev;
2133
2134         bdev = ext3_blkdev_get(j_dev, sb);
2135         if (bdev == NULL)
2136                 return NULL;
2137
2138         blocksize = sb->s_blocksize;
2139         hblock = bdev_logical_block_size(bdev);
2140         if (blocksize < hblock) {
2141                 ext3_msg(sb, KERN_ERR,
2142                         "error: blocksize too small for journal device");
2143                 goto out_bdev;
2144         }
2145
2146         sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
2147         offset = EXT3_MIN_BLOCK_SIZE % blocksize;
2148         set_blocksize(bdev, blocksize);
2149         if (!(bh = __bread(bdev, sb_block, blocksize))) {
2150                 ext3_msg(sb, KERN_ERR, "error: couldn't read superblock of "
2151                         "external journal");
2152                 goto out_bdev;
2153         }
2154
2155         es = (struct ext3_super_block *) (bh->b_data + offset);
2156         if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
2157             !(le32_to_cpu(es->s_feature_incompat) &
2158               EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2159                 ext3_msg(sb, KERN_ERR, "error: external journal has "
2160                         "bad superblock");
2161                 brelse(bh);
2162                 goto out_bdev;
2163         }
2164
2165         if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2166                 ext3_msg(sb, KERN_ERR, "error: journal UUID does not match");
2167                 brelse(bh);
2168                 goto out_bdev;
2169         }
2170
2171         len = le32_to_cpu(es->s_blocks_count);
2172         start = sb_block + 1;
2173         brelse(bh);     /* we're done with the superblock */
2174
2175         journal = journal_init_dev(bdev, sb->s_bdev,
2176                                         start, len, blocksize);
2177         if (!journal) {
2178                 ext3_msg(sb, KERN_ERR,
2179                         "error: failed to create device journal");
2180                 goto out_bdev;
2181         }
2182         journal->j_private = sb;
2183         ll_rw_block(READ, 1, &journal->j_sb_buffer);
2184         wait_on_buffer(journal->j_sb_buffer);
2185         if (!buffer_uptodate(journal->j_sb_buffer)) {
2186                 ext3_msg(sb, KERN_ERR, "I/O error on journal device");
2187                 goto out_journal;
2188         }
2189         if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
2190                 ext3_msg(sb, KERN_ERR,
2191                         "error: external journal has more than one "
2192                         "user (unsupported) - %d",
2193                         be32_to_cpu(journal->j_superblock->s_nr_users));
2194                 goto out_journal;
2195         }
2196         EXT3_SB(sb)->journal_bdev = bdev;
2197         ext3_init_journal_params(sb, journal);
2198         return journal;
2199 out_journal:
2200         journal_destroy(journal);
2201 out_bdev:
2202         ext3_blkdev_put(bdev);
2203         return NULL;
2204 }
2205
2206 static int ext3_load_journal(struct super_block *sb,
2207                              struct ext3_super_block *es,
2208                              unsigned long journal_devnum)
2209 {
2210         journal_t *journal;
2211         unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2212         dev_t journal_dev;
2213         int err = 0;
2214         int really_read_only;
2215
2216         if (journal_devnum &&
2217             journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2218                 ext3_msg(sb, KERN_INFO, "external journal device major/minor "
2219                         "numbers have changed");
2220                 journal_dev = new_decode_dev(journal_devnum);
2221         } else
2222                 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2223
2224         really_read_only = bdev_read_only(sb->s_bdev);
2225
2226         /*
2227          * Are we loading a blank journal or performing recovery after a
2228          * crash?  For recovery, we need to check in advance whether we
2229          * can get read-write access to the device.
2230          */
2231
2232         if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
2233                 if (sb->s_flags & MS_RDONLY) {
2234                         ext3_msg(sb, KERN_INFO,
2235                                 "recovery required on readonly filesystem");
2236                         if (really_read_only) {
2237                                 ext3_msg(sb, KERN_ERR, "error: write access "
2238                                         "unavailable, cannot proceed");
2239                                 return -EROFS;
2240                         }
2241                         ext3_msg(sb, KERN_INFO,
2242                                 "write access will be enabled during recovery");
2243                 }
2244         }
2245
2246         if (journal_inum && journal_dev) {
2247                 ext3_msg(sb, KERN_ERR, "error: filesystem has both journal "
2248                        "and inode journals");
2249                 return -EINVAL;
2250         }
2251
2252         if (journal_inum) {
2253                 if (!(journal = ext3_get_journal(sb, journal_inum)))
2254                         return -EINVAL;
2255         } else {
2256                 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
2257                         return -EINVAL;
2258         }
2259
2260         if (!(journal->j_flags & JFS_BARRIER))
2261                 printk(KERN_INFO "EXT3-fs: barriers not enabled\n");
2262
2263         if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2264                 err = journal_update_format(journal);
2265                 if (err)  {
2266                         ext3_msg(sb, KERN_ERR, "error updating journal");
2267                         journal_destroy(journal);
2268                         return err;
2269                 }
2270         }
2271
2272         if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
2273                 err = journal_wipe(journal, !really_read_only);
2274         if (!err)
2275                 err = journal_load(journal);
2276
2277         if (err) {
2278                 ext3_msg(sb, KERN_ERR, "error loading journal");
2279                 journal_destroy(journal);
2280                 return err;
2281         }
2282
2283         EXT3_SB(sb)->s_journal = journal;
2284         ext3_clear_journal_err(sb, es);
2285
2286         if (journal_devnum &&
2287             journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2288                 es->s_journal_dev = cpu_to_le32(journal_devnum);
2289
2290                 /* Make sure we flush the recovery flag to disk. */
2291                 ext3_commit_super(sb, es, 1);
2292         }
2293
2294         return 0;
2295 }
2296
2297 static int ext3_create_journal(struct super_block *sb,
2298                                struct ext3_super_block *es,
2299                                unsigned int journal_inum)
2300 {
2301         journal_t *journal;
2302         int err;
2303
2304         if (sb->s_flags & MS_RDONLY) {
2305                 ext3_msg(sb, KERN_ERR,
2306                         "error: readonly filesystem when trying to "
2307                         "create journal");
2308                 return -EROFS;
2309         }
2310
2311         journal = ext3_get_journal(sb, journal_inum);
2312         if (!journal)
2313                 return -EINVAL;
2314
2315         ext3_msg(sb, KERN_INFO, "creating new journal on inode %u",
2316                journal_inum);
2317
2318         err = journal_create(journal);
2319         if (err) {
2320                 ext3_msg(sb, KERN_ERR, "error creating journal");
2321                 journal_destroy(journal);
2322                 return -EIO;
2323         }
2324
2325         EXT3_SB(sb)->s_journal = journal;
2326
2327         ext3_update_dynamic_rev(sb);
2328         EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2329         EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2330
2331         es->s_journal_inum = cpu_to_le32(journal_inum);
2332
2333         /* Make sure we flush the recovery flag to disk. */
2334         ext3_commit_super(sb, es, 1);
2335
2336         return 0;
2337 }
2338
2339 static int ext3_commit_super(struct super_block *sb,
2340                                struct ext3_super_block *es,
2341                                int sync)
2342 {
2343         struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
2344         int error = 0;
2345
2346         if (!sbh)
2347                 return error;
2348
2349         if (buffer_write_io_error(sbh)) {
2350                 /*
2351                  * Oh, dear.  A previous attempt to write the
2352                  * superblock failed.  This could happen because the
2353                  * USB device was yanked out.  Or it could happen to
2354                  * be a transient write error and maybe the block will
2355                  * be remapped.  Nothing we can do but to retry the
2356                  * write and hope for the best.
2357                  */
2358                 ext3_msg(sb, KERN_ERR, "previous I/O error to "
2359                        "superblock detected");
2360                 clear_buffer_write_io_error(sbh);
2361                 set_buffer_uptodate(sbh);
2362         }
2363         /*
2364          * If the file system is mounted read-only, don't update the
2365          * superblock write time.  This avoids updating the superblock
2366          * write time when we are mounting the root file system
2367          * read/only but we need to replay the journal; at that point,
2368          * for people who are east of GMT and who make their clock
2369          * tick in localtime for Windows bug-for-bug compatibility,
2370          * the clock is set in the future, and this will cause e2fsck
2371          * to complain and force a full file system check.
2372          */
2373         if (!(sb->s_flags & MS_RDONLY))
2374                 es->s_wtime = cpu_to_le32(get_seconds());
2375         es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2376         es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2377         BUFFER_TRACE(sbh, "marking dirty");
2378         mark_buffer_dirty(sbh);
2379         if (sync) {
2380                 error = sync_dirty_buffer(sbh);
2381                 if (buffer_write_io_error(sbh)) {
2382                         ext3_msg(sb, KERN_ERR, "I/O error while writing "
2383                                "superblock");
2384                         clear_buffer_write_io_error(sbh);
2385                         set_buffer_uptodate(sbh);
2386                 }
2387         }
2388         return error;
2389 }
2390
2391
2392 /*
2393  * Have we just finished recovery?  If so, and if we are mounting (or
2394  * remounting) the filesystem readonly, then we will end up with a
2395  * consistent fs on disk.  Record that fact.
2396  */
2397 static void ext3_mark_recovery_complete(struct super_block * sb,
2398                                         struct ext3_super_block * es)
2399 {
2400         journal_t *journal = EXT3_SB(sb)->s_journal;
2401
2402         journal_lock_updates(journal);
2403         if (journal_flush(journal) < 0)
2404                 goto out;
2405
2406         if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2407             sb->s_flags & MS_RDONLY) {
2408                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2409                 ext3_commit_super(sb, es, 1);
2410         }
2411
2412 out:
2413         journal_unlock_updates(journal);
2414 }
2415
2416 /*
2417  * If we are mounting (or read-write remounting) a filesystem whose journal
2418  * has recorded an error from a previous lifetime, move that error to the
2419  * main filesystem now.
2420  */
2421 static void ext3_clear_journal_err(struct super_block *sb,
2422                                    struct ext3_super_block *es)
2423 {
2424         journal_t *journal;
2425         int j_errno;
2426         const char *errstr;
2427
2428         journal = EXT3_SB(sb)->s_journal;
2429
2430         /*
2431          * Now check for any error status which may have been recorded in the
2432          * journal by a prior ext3_error() or ext3_abort()
2433          */
2434
2435         j_errno = journal_errno(journal);
2436         if (j_errno) {
2437                 char nbuf[16];
2438
2439                 errstr = ext3_decode_error(sb, j_errno, nbuf);
2440                 ext3_warning(sb, __func__, "Filesystem error recorded "
2441                              "from previous mount: %s", errstr);
2442                 ext3_warning(sb, __func__, "Marking fs in need of "
2443                              "filesystem check.");
2444
2445                 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2446                 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2447                 ext3_commit_super (sb, es, 1);
2448
2449                 journal_clear_err(journal);
2450         }
2451 }
2452
2453 /*
2454  * Force the running and committing transactions to commit,
2455  * and wait on the commit.
2456  */
2457 int ext3_force_commit(struct super_block *sb)
2458 {
2459         journal_t *journal;
2460         int ret;
2461
2462         if (sb->s_flags & MS_RDONLY)
2463                 return 0;
2464
2465         journal = EXT3_SB(sb)->s_journal;
2466         ret = ext3_journal_force_commit(journal);
2467         return ret;
2468 }
2469
2470 static int ext3_sync_fs(struct super_block *sb, int wait)
2471 {
2472         tid_t target;
2473
2474         if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2475                 if (wait)
2476                         log_wait_commit(EXT3_SB(sb)->s_journal, target);
2477         }
2478         return 0;
2479 }
2480
2481 /*
2482  * LVM calls this function before a (read-only) snapshot is created.  This
2483  * gives us a chance to flush the journal completely and mark the fs clean.
2484  */
2485 static int ext3_freeze(struct super_block *sb)
2486 {
2487         int error = 0;
2488         journal_t *journal;
2489
2490         if (!(sb->s_flags & MS_RDONLY)) {
2491                 journal = EXT3_SB(sb)->s_journal;
2492
2493                 /* Now we set up the journal barrier. */
2494                 journal_lock_updates(journal);
2495
2496                 /*
2497                  * We don't want to clear needs_recovery flag when we failed
2498                  * to flush the journal.
2499                  */
2500                 error = journal_flush(journal);
2501                 if (error < 0)
2502                         goto out;
2503
2504                 /* Journal blocked and flushed, clear needs_recovery flag. */
2505                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2506                 error = ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2507                 if (error)
2508                         goto out;
2509         }
2510         return 0;
2511
2512 out:
2513         journal_unlock_updates(journal);
2514         return error;
2515 }
2516
2517 /*
2518  * Called by LVM after the snapshot is done.  We need to reset the RECOVER
2519  * flag here, even though the filesystem is not technically dirty yet.
2520  */
2521 static int ext3_unfreeze(struct super_block *sb)
2522 {
2523         if (!(sb->s_flags & MS_RDONLY)) {
2524                 lock_super(sb);
2525                 /* Reser the needs_recovery flag before the fs is unlocked. */
2526                 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2527                 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2528                 unlock_super(sb);
2529                 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2530         }
2531         return 0;
2532 }
2533
2534 static int ext3_remount (struct super_block * sb, int * flags, char * data)
2535 {
2536         struct ext3_super_block * es;
2537         struct ext3_sb_info *sbi = EXT3_SB(sb);
2538         ext3_fsblk_t n_blocks_count = 0;
2539         unsigned long old_sb_flags;
2540         struct ext3_mount_options old_opts;
2541         int enable_quota = 0;
2542         int err;
2543 #ifdef CONFIG_QUOTA
2544         int i;
2545 #endif
2546
2547         /* Store the original options */
2548         lock_super(sb);
2549         old_sb_flags = sb->s_flags;
2550         old_opts.s_mount_opt = sbi->s_mount_opt;
2551         old_opts.s_resuid = sbi->s_resuid;
2552         old_opts.s_resgid = sbi->s_resgid;
2553         old_opts.s_commit_interval = sbi->s_commit_interval;
2554 #ifdef CONFIG_QUOTA
2555         old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2556         for (i = 0; i < MAXQUOTAS; i++)
2557                 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2558 #endif
2559
2560         /*
2561          * Allow the "check" option to be passed as a remount option.
2562          */
2563         if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2564                 err = -EINVAL;
2565                 goto restore_opts;
2566         }
2567
2568         if (test_opt(sb, ABORT))
2569                 ext3_abort(sb, __func__, "Abort forced by user");
2570
2571         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2572                 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
2573
2574         es = sbi->s_es;
2575
2576         ext3_init_journal_params(sb, sbi->s_journal);
2577
2578         if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2579                 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
2580                 if (test_opt(sb, ABORT)) {
2581                         err = -EROFS;
2582                         goto restore_opts;
2583                 }
2584
2585                 if (*flags & MS_RDONLY) {
2586                         err = dquot_suspend(sb, -1);
2587                         if (err < 0)
2588                                 goto restore_opts;
2589
2590                         /*
2591                          * First of all, the unconditional stuff we have to do
2592                          * to disable replay of the journal when we next remount
2593                          */
2594                         sb->s_flags |= MS_RDONLY;
2595
2596                         /*
2597                          * OK, test if we are remounting a valid rw partition
2598                          * readonly, and if so set the rdonly flag and then
2599                          * mark the partition as valid again.
2600                          */
2601                         if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2602                             (sbi->s_mount_state & EXT3_VALID_FS))
2603                                 es->s_state = cpu_to_le16(sbi->s_mount_state);
2604
2605                         ext3_mark_recovery_complete(sb, es);
2606                 } else {
2607                         __le32 ret;
2608                         if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2609                                         ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2610                                 ext3_msg(sb, KERN_WARNING,
2611                                         "warning: couldn't remount RDWR "
2612                                         "because of unsupported optional "
2613                                         "features (%x)", le32_to_cpu(ret));
2614                                 err = -EROFS;
2615                                 goto restore_opts;
2616                         }
2617
2618                         /*
2619                          * If we have an unprocessed orphan list hanging
2620                          * around from a previously readonly bdev mount,
2621                          * require a full umount/remount for now.
2622                          */
2623                         if (es->s_last_orphan) {
2624                                 ext3_msg(sb, KERN_WARNING, "warning: couldn't "
2625                                        "remount RDWR because of unprocessed "
2626                                        "orphan inode list.  Please "
2627                                        "umount/remount instead.");
2628                                 err = -EINVAL;
2629                                 goto restore_opts;
2630                         }
2631
2632                         /*
2633                          * Mounting a RDONLY partition read-write, so reread
2634                          * and store the current valid flag.  (It may have
2635                          * been changed by e2fsck since we originally mounted
2636                          * the partition.)
2637                          */
2638                         ext3_clear_journal_err(sb, es);
2639                         sbi->s_mount_state = le16_to_cpu(es->s_state);
2640                         if ((err = ext3_group_extend(sb, es, n_blocks_count)))
2641                                 goto restore_opts;
2642                         if (!ext3_setup_super (sb, es, 0))
2643                                 sb->s_flags &= ~MS_RDONLY;
2644                         enable_quota = 1;
2645                 }
2646         }
2647 #ifdef CONFIG_QUOTA
2648         /* Release old quota file names */
2649         for (i = 0; i < MAXQUOTAS; i++)
2650                 if (old_opts.s_qf_names[i] &&
2651                     old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2652                         kfree(old_opts.s_qf_names[i]);
2653 #endif
2654         unlock_super(sb);
2655
2656         if (enable_quota)
2657                 dquot_resume(sb, -1);
2658         return 0;
2659 restore_opts:
2660         sb->s_flags = old_sb_flags;
2661         sbi->s_mount_opt = old_opts.s_mount_opt;
2662         sbi->s_resuid = old_opts.s_resuid;
2663         sbi->s_resgid = old_opts.s_resgid;
2664         sbi->s_commit_interval = old_opts.s_commit_interval;
2665 #ifdef CONFIG_QUOTA
2666         sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2667         for (i = 0; i < MAXQUOTAS; i++) {
2668                 if (sbi->s_qf_names[i] &&
2669                     old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2670                         kfree(sbi->s_qf_names[i]);
2671                 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2672         }
2673 #endif
2674         unlock_super(sb);
2675         return err;
2676 }
2677
2678 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
2679 {
2680         struct super_block *sb = dentry->d_sb;
2681         struct ext3_sb_info *sbi = EXT3_SB(sb);
2682         struct ext3_super_block *es = sbi->s_es;
2683         u64 fsid;
2684
2685         if (test_opt(sb, MINIX_DF)) {
2686                 sbi->s_overhead_last = 0;
2687         } else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
2688                 unsigned long ngroups = sbi->s_groups_count, i;
2689                 ext3_fsblk_t overhead = 0;
2690                 smp_rmb();
2691
2692                 /*
2693                  * Compute the overhead (FS structures).  This is constant
2694                  * for a given filesystem unless the number of block groups
2695                  * changes so we cache the previous value until it does.
2696                  */
2697
2698                 /*
2699                  * All of the blocks before first_data_block are
2700                  * overhead
2701                  */
2702                 overhead = le32_to_cpu(es->s_first_data_block);
2703
2704                 /*
2705                  * Add the overhead attributed to the superblock and
2706                  * block group descriptors.  If the sparse superblocks
2707                  * feature is turned on, then not all groups have this.
2708                  */
2709                 for (i = 0; i < ngroups; i++) {
2710                         overhead += ext3_bg_has_super(sb, i) +
2711                                 ext3_bg_num_gdb(sb, i);
2712                         cond_resched();
2713                 }
2714
2715                 /*
2716                  * Every block group has an inode bitmap, a block
2717                  * bitmap, and an inode table.
2718                  */
2719                 overhead += ngroups * (2 + sbi->s_itb_per_group);
2720                 sbi->s_overhead_last = overhead;
2721                 smp_wmb();
2722                 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
2723         }
2724
2725         buf->f_type = EXT3_SUPER_MAGIC;
2726         buf->f_bsize = sb->s_blocksize;
2727         buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
2728         buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
2729         buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2730         if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2731                 buf->f_bavail = 0;
2732         buf->f_files = le32_to_cpu(es->s_inodes_count);
2733         buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
2734         buf->f_namelen = EXT3_NAME_LEN;
2735         fsid = le64_to_cpup((void *)es->s_uuid) ^
2736                le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2737         buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2738         buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
2739         return 0;
2740 }
2741
2742 /* Helper function for writing quotas on sync - we need to start transaction before quota file
2743  * is locked for write. Otherwise the are possible deadlocks:
2744  * Process 1                         Process 2
2745  * ext3_create()                     quota_sync()
2746  *   journal_start()                   write_dquot()
2747  *   dquot_initialize()                       down(dqio_mutex)
2748  *     down(dqio_mutex)                    journal_start()
2749  *
2750  */
2751
2752 #ifdef CONFIG_QUOTA
2753
2754 static inline struct inode *dquot_to_inode(struct dquot *dquot)
2755 {
2756         return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2757 }
2758
2759 static int ext3_write_dquot(struct dquot *dquot)
2760 {
2761         int ret, err;
2762         handle_t *handle;
2763         struct inode *inode;
2764
2765         inode = dquot_to_inode(dquot);
2766         handle = ext3_journal_start(inode,
2767                                         EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2768         if (IS_ERR(handle))
2769                 return PTR_ERR(handle);
2770         ret = dquot_commit(dquot);
2771         err = ext3_journal_stop(handle);
2772         if (!ret)
2773                 ret = err;
2774         return ret;
2775 }
2776
2777 static int ext3_acquire_dquot(struct dquot *dquot)
2778 {
2779         int ret, err;
2780         handle_t *handle;
2781
2782         handle = ext3_journal_start(dquot_to_inode(dquot),
2783                                         EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2784         if (IS_ERR(handle))
2785                 return PTR_ERR(handle);
2786         ret = dquot_acquire(dquot);
2787         err = ext3_journal_stop(handle);
2788         if (!ret)
2789                 ret = err;
2790         return ret;
2791 }
2792
2793 static int ext3_release_dquot(struct dquot *dquot)
2794 {
2795         int ret, err;
2796         handle_t *handle;
2797
2798         handle = ext3_journal_start(dquot_to_inode(dquot),
2799                                         EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2800         if (IS_ERR(handle)) {
2801                 /* Release dquot anyway to avoid endless cycle in dqput() */
2802                 dquot_release(dquot);
2803                 return PTR_ERR(handle);
2804         }
2805         ret = dquot_release(dquot);
2806         err = ext3_journal_stop(handle);
2807         if (!ret)
2808                 ret = err;
2809         return ret;
2810 }
2811
2812 static int ext3_mark_dquot_dirty(struct dquot *dquot)
2813 {
2814         /* Are we journaling quotas? */
2815         if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2816             EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2817                 dquot_mark_dquot_dirty(dquot);
2818                 return ext3_write_dquot(dquot);
2819         } else {
2820                 return dquot_mark_dquot_dirty(dquot);
2821         }
2822 }
2823
2824 static int ext3_write_info(struct super_block *sb, int type)
2825 {
2826         int ret, err;
2827         handle_t *handle;
2828
2829         /* Data block + inode block */
2830         handle = ext3_journal_start(sb->s_root->d_inode, 2);
2831         if (IS_ERR(handle))
2832                 return PTR_ERR(handle);
2833         ret = dquot_commit_info(sb, type);
2834         err = ext3_journal_stop(handle);
2835         if (!ret)
2836                 ret = err;
2837         return ret;
2838 }
2839
2840 /*
2841  * Turn on quotas during mount time - we need to find
2842  * the quota file and such...
2843  */
2844 static int ext3_quota_on_mount(struct super_block *sb, int type)
2845 {
2846         return dquot_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2847                                         EXT3_SB(sb)->s_jquota_fmt, type);
2848 }
2849
2850 /*
2851  * Standard function to be called on quota_on
2852  */
2853 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
2854                          char *name)
2855 {
2856         int err;
2857         struct path path;
2858
2859         if (!test_opt(sb, QUOTA))
2860                 return -EINVAL;
2861
2862         err = kern_path(name, LOOKUP_FOLLOW, &path);
2863         if (err)
2864                 return err;
2865
2866         /* Quotafile not on the same filesystem? */
2867         if (path.mnt->mnt_sb != sb) {
2868                 path_put(&path);
2869                 return -EXDEV;
2870         }
2871         /* Journaling quota? */
2872         if (EXT3_SB(sb)->s_qf_names[type]) {
2873                 /* Quotafile not of fs root? */
2874                 if (path.dentry->d_parent != sb->s_root)
2875                         ext3_msg(sb, KERN_WARNING,
2876                                 "warning: Quota file not on filesystem root. "
2877                                 "Journaled quota will not work.");
2878         }
2879
2880         /*
2881          * When we journal data on quota file, we have to flush journal to see
2882          * all updates to the file when we bypass pagecache...
2883          */
2884         if (ext3_should_journal_data(path.dentry->d_inode)) {
2885                 /*
2886                  * We don't need to lock updates but journal_flush() could
2887                  * otherwise be livelocked...
2888                  */
2889                 journal_lock_updates(EXT3_SB(sb)->s_journal);
2890                 err = journal_flush(EXT3_SB(sb)->s_journal);
2891                 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2892                 if (err) {
2893                         path_put(&path);
2894                         return err;
2895                 }
2896         }
2897
2898         err = dquot_quota_on_path(sb, type, format_id, &path);
2899         path_put(&path);
2900         return err;
2901 }
2902
2903 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2904  * acquiring the locks... As quota files are never truncated and quota code
2905  * itself serializes the operations (and noone else should touch the files)
2906  * we don't have to be afraid of races */
2907 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2908                                size_t len, loff_t off)
2909 {
2910         struct inode *inode = sb_dqopt(sb)->files[type];
2911         sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2912         int err = 0;
2913         int offset = off & (sb->s_blocksize - 1);
2914         int tocopy;
2915         size_t toread;
2916         struct buffer_head *bh;
2917         loff_t i_size = i_size_read(inode);
2918
2919         if (off > i_size)
2920                 return 0;
2921         if (off+len > i_size)
2922                 len = i_size-off;
2923         toread = len;
2924         while (toread > 0) {
2925                 tocopy = sb->s_blocksize - offset < toread ?
2926                                 sb->s_blocksize - offset : toread;
2927                 bh = ext3_bread(NULL, inode, blk, 0, &err);
2928                 if (err)
2929                         return err;
2930                 if (!bh)        /* A hole? */
2931                         memset(data, 0, tocopy);
2932                 else
2933                         memcpy(data, bh->b_data+offset, tocopy);
2934                 brelse(bh);
2935                 offset = 0;
2936                 toread -= tocopy;
2937                 data += tocopy;
2938                 blk++;
2939         }
2940         return len;
2941 }
2942
2943 /* Write to quotafile (we know the transaction is already started and has
2944  * enough credits) */
2945 static ssize_t ext3_quota_write(struct super_block *sb, int type,
2946                                 const char *data, size_t len, loff_t off)
2947 {
2948         struct inode *inode = sb_dqopt(sb)->files[type];
2949         sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2950         int err = 0;
2951         int offset = off & (sb->s_blocksize - 1);
2952         int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
2953         struct buffer_head *bh;
2954         handle_t *handle = journal_current_handle();
2955
2956         if (!handle) {
2957                 ext3_msg(sb, KERN_WARNING,
2958                         "warning: quota write (off=%llu, len=%llu)"
2959                         " cancelled because transaction is not started.",
2960                         (unsigned long long)off, (unsigned long long)len);
2961                 return -EIO;
2962         }
2963
2964         /*
2965          * Since we account only one data block in transaction credits,
2966          * then it is impossible to cross a block boundary.
2967          */
2968         if (sb->s_blocksize - offset < len) {
2969                 ext3_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
2970                         " cancelled because not block aligned",
2971                         (unsigned long long)off, (unsigned long long)len);
2972                 return -EIO;
2973         }
2974         mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2975         bh = ext3_bread(handle, inode, blk, 1, &err);
2976         if (!bh)
2977                 goto out;
2978         if (journal_quota) {
2979                 err = ext3_journal_get_write_access(handle, bh);
2980                 if (err) {
2981                         brelse(bh);
2982                         goto out;
2983                 }
2984         }
2985         lock_buffer(bh);
2986         memcpy(bh->b_data+offset, data, len);
2987         flush_dcache_page(bh->b_page);
2988         unlock_buffer(bh);
2989         if (journal_quota)
2990                 err = ext3_journal_dirty_metadata(handle, bh);
2991         else {
2992                 /* Always do at least ordered writes for quotas */
2993                 err = ext3_journal_dirty_data(handle, bh);
2994                 mark_buffer_dirty(bh);
2995         }
2996         brelse(bh);
2997 out:
2998         if (err) {
2999                 mutex_unlock(&inode->i_mutex);
3000                 return err;
3001         }
3002         if (inode->i_size < off + len) {
3003                 i_size_write(inode, off + len);
3004                 EXT3_I(inode)->i_disksize = inode->i_size;
3005         }
3006         inode->i_version++;
3007         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
3008         ext3_mark_inode_dirty(handle, inode);
3009         mutex_unlock(&inode->i_mutex);
3010         return len;
3011 }
3012
3013 #endif
3014
3015 static struct dentry *ext3_mount(struct file_system_type *fs_type,
3016         int flags, const char *dev_name, void *data)
3017 {
3018         return mount_bdev(fs_type, flags, dev_name, data, ext3_fill_super);
3019 }
3020
3021 static struct file_system_type ext3_fs_type = {
3022         .owner          = THIS_MODULE,
3023         .name           = "ext3",
3024         .mount          = ext3_mount,
3025         .kill_sb        = kill_block_super,
3026         .fs_flags       = FS_REQUIRES_DEV,
3027 };
3028
3029 static int __init init_ext3_fs(void)
3030 {
3031         int err = init_ext3_xattr();
3032         if (err)
3033                 return err;
3034         err = init_inodecache();
3035         if (err)
3036                 goto out1;
3037         err = register_filesystem(&ext3_fs_type);
3038         if (err)
3039                 goto out;
3040         return 0;
3041 out:
3042         destroy_inodecache();
3043 out1:
3044         exit_ext3_xattr();
3045         return err;
3046 }
3047
3048 static void __exit exit_ext3_fs(void)
3049 {
3050         unregister_filesystem(&ext3_fs_type);
3051         destroy_inodecache();
3052         exit_ext3_xattr();
3053 }
3054
3055 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
3056 MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
3057 MODULE_LICENSE("GPL");
3058 module_init(init_ext3_fs)
3059 module_exit(exit_ext3_fs)