fs/ext3/super.c

   1 /*
   2  *  linux/fs/ext3/super.c
   3  *
   4  * Copyright (C) 1992, 1993, 1994, 1995
   5  * Remy Card (card@masi.ibp.fr)
   6  * Laboratoire MASI - Institut Blaise Pascal
   7  * Universite Pierre et Marie Curie (Paris VI)
   8  *
   9  *  from
  10  *
  11  *  linux/fs/minix/inode.c
  12  *
  13  *  Copyright (C) 1991, 1992  Linus Torvalds
  14  *
  15  *  Big-endian to little-endian byte-swapping/bitmaps by
  16  *        David S. Miller (davem@caip.rutgers.edu), 1995
  17  */
  18
  19 #include <linux/module.h>
  20 #include <linux/blkdev.h>
  21 #include <linux/parser.h>
  22 #include <linux/exportfs.h>
  23 #include <linux/statfs.h>
  24 #include <linux/random.h>
  25 #include <linux/mount.h>
  26 #include <linux/quotaops.h>
  27 #include <linux/seq_file.h>
  28 #include <linux/log2.h>
  29 #include <linux/cleancache.h>
  30
  31 #include <asm/uaccess.h>
  32
  33 #define CREATE_TRACE_POINTS
  34
  35 #include "ext3.h"
  36 #include "xattr.h"
  37 #include "acl.h"
  38 #include "namei.h"
  39
  40 #ifdef CONFIG_EXT3_DEFAULTS_TO_ORDERED
  41   #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_ORDERED_DATA
  42 #else
  43   #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_WRITEBACK_DATA
  44 #endif
  45
  46 static int ext3_load_journal(struct super_block *, struct ext3_super_block *,
  47                              unsigned long journal_devnum);
  48 static int ext3_create_journal(struct super_block *, struct ext3_super_block *,
  49                                unsigned int);
  50 static int ext3_commit_super(struct super_block *sb,
  51                                struct ext3_super_block *es,
  52                                int sync);
  53 static void ext3_mark_recovery_complete(struct super_block * sb,
  54                                         struct ext3_super_block * es);
  55 static void ext3_clear_journal_err(struct super_block * sb,
  56                                    struct ext3_super_block * es);
  57 static int ext3_sync_fs(struct super_block *sb, int wait);
  58 static const char *ext3_decode_error(struct super_block * sb, int errno,
  59                                      char nbuf[16]);
  60 static int ext3_remount (struct super_block * sb, int * flags, char * data);
  61 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf);
  62 static int ext3_unfreeze(struct super_block *sb);
  63 static int ext3_freeze(struct super_block *sb);
  64
  65 /*
  66  * Wrappers for journal_start/end.
  67  */
  68 handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks)
  69 {
  70         journal_t *journal;
  71
  72         if (sb->s_flags & MS_RDONLY)
  73                 return ERR_PTR(-EROFS);
  74
  75         /* Special case here: if the journal has aborted behind our
  76          * backs (eg. EIO in the commit thread), then we still need to
  77          * take the FS itself readonly cleanly. */
  78         journal = EXT3_SB(sb)->s_journal;
  79         if (is_journal_aborted(journal)) {
  80                 ext3_abort(sb, __func__,
  81                            "Detected aborted journal");
  82                 return ERR_PTR(-EROFS);
  83         }
  84
  85         return journal_start(journal, nblocks);
  86 }
  87
  88 int __ext3_journal_stop(const char *where, handle_t *handle)
  89 {
  90         struct super_block *sb;
  91         int err;
  92         int rc;
  93
  94         sb = handle->h_transaction->t_journal->j_private;
  95         err = handle->h_err;
  96         rc = journal_stop(handle);
  97
  98         if (!err)
  99                 err = rc;
 100         if (err)
 101                 __ext3_std_error(sb, where, err);
 102         return err;
 103 }
 104
 105 void ext3_journal_abort_handle(const char *caller, const char *err_fn,
 106                 struct buffer_head *bh, handle_t *handle, int err)
 107 {
 108         char nbuf[16];
 109         const char *errstr = ext3_decode_error(NULL, err, nbuf);
 110
 111         if (bh)
 112                 BUFFER_TRACE(bh, "abort");
 113
 114         if (!handle->h_err)
 115                 handle->h_err = err;
 116
 117         if (is_handle_aborted(handle))
 118                 return;
 119
 120         printk(KERN_ERR "EXT3-fs: %s: aborting transaction: %s in %s\n",
 121                 caller, errstr, err_fn);
 122
 123         journal_abort_handle(handle);
 124 }
 125
 126 void ext3_msg(struct super_block *sb, const char *prefix,
 127                 const char *fmt, ...)
 128 {
 129         struct va_format vaf;
 130         va_list args;
 131
 132         va_start(args, fmt);
 133
 134         vaf.fmt = fmt;
 135         vaf.va = &args;
 136
 137         printk("%sEXT3-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
 138
 139         va_end(args);
 140 }
 141
 142 /* Deal with the reporting of failure conditions on a filesystem such as
 143  * inconsistencies detected or read IO failures.
 144  *
 145  * On ext2, we can store the error state of the filesystem in the
 146  * superblock.  That is not possible on ext3, because we may have other
 147  * write ordering constraints on the superblock which prevent us from
 148  * writing it out straight away; and given that the journal is about to
 149  * be aborted, we can't rely on the current, or future, transactions to
 150  * write out the superblock safely.
 151  *
 152  * We'll just use the journal_abort() error code to record an error in
 153  * the journal instead.  On recovery, the journal will complain about
 154  * that error until we've noted it down and cleared it.
 155  */
 156
 157 static void ext3_handle_error(struct super_block *sb)
 158 {
 159         struct ext3_super_block *es = EXT3_SB(sb)->s_es;
 160
 161         EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
 162         es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
 163
 164         if (sb->s_flags & MS_RDONLY)
 165                 return;
 166
 167         if (!test_opt (sb, ERRORS_CONT)) {
 168                 journal_t *journal = EXT3_SB(sb)->s_journal;
 169
 170                 set_opt(EXT3_SB(sb)->s_mount_opt, ABORT);
 171                 if (journal)
 172                         journal_abort(journal, -EIO);
 173         }
 174         if (test_opt (sb, ERRORS_RO)) {
 175                 ext3_msg(sb, KERN_CRIT,
 176                         "error: remounting filesystem read-only");
 177                 sb->s_flags |= MS_RDONLY;
 178         }
 179         ext3_commit_super(sb, es, 1);
 180         if (test_opt(sb, ERRORS_PANIC))
 181                 panic("EXT3-fs (%s): panic forced after error\n",
 182                         sb->s_id);
 183 }
 184
 185 void ext3_error(struct super_block *sb, const char *function,
 186                 const char *fmt, ...)
 187 {
 188         struct va_format vaf;
 189         va_list args;
 190
 191         va_start(args, fmt);
 192
 193         vaf.fmt = fmt;
 194         vaf.va = &args;
 195
 196         printk(KERN_CRIT "EXT3-fs error (device %s): %s: %pV\n",
 197                sb->s_id, function, &vaf);
 198
 199         va_end(args);
 200
 201         ext3_handle_error(sb);
 202 }
 203
 204 static const char *ext3_decode_error(struct super_block * sb, int errno,
 205                                      char nbuf[16])
 206 {
 207         char *errstr = NULL;
 208
 209         switch (errno) {
 210         case -EIO:
 211                 errstr = "IO failure";
 212                 break;
 213         case -ENOMEM:
 214                 errstr = "Out of memory";
 215                 break;
 216         case -EROFS:
 217                 if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT)
 218                         errstr = "Journal has aborted";
 219                 else
 220                         errstr = "Readonly filesystem";
 221                 break;
 222         default:
 223                 /* If the caller passed in an extra buffer for unknown
 224                  * errors, textualise them now.  Else we just return
 225                  * NULL. */
 226                 if (nbuf) {
 227                         /* Check for truncated error codes... */
 228                         if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
 229                                 errstr = nbuf;
 230                 }
 231                 break;
 232         }
 233
 234         return errstr;
 235 }
 236
 237 /* __ext3_std_error decodes expected errors from journaling functions
 238  * automatically and invokes the appropriate error response.  */
 239
 240 void __ext3_std_error (struct super_block * sb, const char * function,
 241                        int errno)
 242 {
 243         char nbuf[16];
 244         const char *errstr;
 245
 246         /* Special case: if the error is EROFS, and we're not already
 247          * inside a transaction, then there's really no point in logging
 248          * an error. */
 249         if (errno == -EROFS && journal_current_handle() == NULL &&
 250             (sb->s_flags & MS_RDONLY))
 251                 return;
 252
 253         errstr = ext3_decode_error(sb, errno, nbuf);
 254         ext3_msg(sb, KERN_CRIT, "error in %s: %s", function, errstr);
 255
 256         ext3_handle_error(sb);
 257 }
 258
 259 /*
 260  * ext3_abort is a much stronger failure handler than ext3_error.  The
 261  * abort function may be used to deal with unrecoverable failures such
 262  * as journal IO errors or ENOMEM at a critical moment in log management.
 263  *
 264  * We unconditionally force the filesystem into an ABORT|READONLY state,
 265  * unless the error response on the fs has been set to panic in which
 266  * case we take the easy way out and panic immediately.
 267  */
 268
 269 void ext3_abort(struct super_block *sb, const char *function,
 270                  const char *fmt, ...)
 271 {
 272         struct va_format vaf;
 273         va_list args;
 274
 275         va_start(args, fmt);
 276
 277         vaf.fmt = fmt;
 278         vaf.va = &args;
 279
 280         printk(KERN_CRIT "EXT3-fs (%s): error: %s: %pV\n",
 281                sb->s_id, function, &vaf);
 282
 283         va_end(args);
 284
 285         if (test_opt(sb, ERRORS_PANIC))
 286                 panic("EXT3-fs: panic from previous error\n");
 287
 288         if (sb->s_flags & MS_RDONLY)
 289                 return;
 290
 291         ext3_msg(sb, KERN_CRIT,
 292                 "error: remounting filesystem read-only");
 293         EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
 294         sb->s_flags |= MS_RDONLY;
 295         set_opt(EXT3_SB(sb)->s_mount_opt, ABORT);
 296         if (EXT3_SB(sb)->s_journal)
 297                 journal_abort(EXT3_SB(sb)->s_journal, -EIO);
 298 }
 299
 300 void ext3_warning(struct super_block *sb, const char *function,
 301                   const char *fmt, ...)
 302 {
 303         struct va_format vaf;
 304         va_list args;
 305
 306         va_start(args, fmt);
 307
 308         vaf.fmt = fmt;
 309         vaf.va = &args;
 310
 311         printk(KERN_WARNING "EXT3-fs (%s): warning: %s: %pV\n",
 312                sb->s_id, function, &vaf);
 313
 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 int ext3_drop_inode(struct inode *inode)
 483 {
 484         int drop = generic_drop_inode(inode);
 485
 486         trace_ext3_drop_inode(inode, drop);
 487         return drop;
 488 }
 489
 490 static void ext3_i_callback(struct rcu_head *head)
 491 {
 492         struct inode *inode = container_of(head, struct inode, i_rcu);
 493         kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
 494 }
 495
 496 static void ext3_destroy_inode(struct inode *inode)
 497 {
 498         if (!list_empty(&(EXT3_I(inode)->i_orphan))) {
 499                 printk("EXT3 Inode %p: orphan list check failed!\n",
 500                         EXT3_I(inode));
 501                 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
 502                                 EXT3_I(inode), sizeof(struct ext3_inode_info),
 503                                 false);
 504                 dump_stack();
 505         }
 506         call_rcu(&inode->i_rcu, ext3_i_callback);
 507 }
 508
 509 static void init_once(void *foo)
 510 {
 511         struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
 512
 513         INIT_LIST_HEAD(&ei->i_orphan);
 514 #ifdef CONFIG_EXT3_FS_XATTR
 515         init_rwsem(&ei->xattr_sem);
 516 #endif
 517         mutex_init(&ei->truncate_mutex);
 518         inode_init_once(&ei->vfs_inode);
 519 }
 520
 521 static int init_inodecache(void)
 522 {
 523         ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
 524                                              sizeof(struct ext3_inode_info),
 525                                              0, (SLAB_RECLAIM_ACCOUNT|
 526                                                 SLAB_MEM_SPREAD),
 527                                              init_once);
 528         if (ext3_inode_cachep == NULL)
 529                 return -ENOMEM;
 530         return 0;
 531 }
 532
 533 static void destroy_inodecache(void)
 534 {
 535         /*
 536          * Make sure all delayed rcu free inodes are flushed before we
 537          * destroy cache.
 538          */
 539         rcu_barrier();
 540         kmem_cache_destroy(ext3_inode_cachep);
 541 }
 542
 543 static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
 544 {
 545 #if defined(CONFIG_QUOTA)
 546         struct ext3_sb_info *sbi = EXT3_SB(sb);
 547
 548         if (sbi->s_jquota_fmt) {
 549                 char *fmtname = "";
 550
 551                 switch (sbi->s_jquota_fmt) {
 552                 case QFMT_VFS_OLD:
 553                         fmtname = "vfsold";
 554                         break;
 555                 case QFMT_VFS_V0:
 556                         fmtname = "vfsv0";
 557                         break;
 558                 case QFMT_VFS_V1:
 559                         fmtname = "vfsv1";
 560                         break;
 561                 }
 562                 seq_printf(seq, ",jqfmt=%s", fmtname);
 563         }
 564
 565         if (sbi->s_qf_names[USRQUOTA])
 566                 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
 567
 568         if (sbi->s_qf_names[GRPQUOTA])
 569                 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
 570
 571         if (test_opt(sb, USRQUOTA))
 572                 seq_puts(seq, ",usrquota");
 573
 574         if (test_opt(sb, GRPQUOTA))
 575                 seq_puts(seq, ",grpquota");
 576 #endif
 577 }
 578
 579 static char *data_mode_string(unsigned long mode)
 580 {
 581         switch (mode) {
 582         case EXT3_MOUNT_JOURNAL_DATA:
 583                 return "journal";
 584         case EXT3_MOUNT_ORDERED_DATA:
 585                 return "ordered";
 586         case EXT3_MOUNT_WRITEBACK_DATA:
 587                 return "writeback";
 588         }
 589         return "unknown";
 590 }
 591
 592 /*
 593  * Show an option if
 594  *  - it's set to a non-default value OR
 595  *  - if the per-sb default is different from the global default
 596  */
 597 static int ext3_show_options(struct seq_file *seq, struct dentry *root)
 598 {
 599         struct super_block *sb = root->d_sb;
 600         struct ext3_sb_info *sbi = EXT3_SB(sb);
 601         struct ext3_super_block *es = sbi->s_es;
 602         unsigned long def_mount_opts;
 603
 604         def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
 605
 606         if (sbi->s_sb_block != 1)
 607                 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
 608         if (test_opt(sb, MINIX_DF))
 609                 seq_puts(seq, ",minixdf");
 610         if (test_opt(sb, GRPID))
 611                 seq_puts(seq, ",grpid");
 612         if (!test_opt(sb, GRPID) && (def_mount_opts & EXT3_DEFM_BSDGROUPS))
 613                 seq_puts(seq, ",nogrpid");
 614         if (!uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT3_DEF_RESUID)) ||
 615             le16_to_cpu(es->s_def_resuid) != EXT3_DEF_RESUID) {
 616                 seq_printf(seq, ",resuid=%u",
 617                                 from_kuid_munged(&init_user_ns, sbi->s_resuid));
 618         }
 619         if (!gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT3_DEF_RESGID)) ||
 620             le16_to_cpu(es->s_def_resgid) != EXT3_DEF_RESGID) {
 621                 seq_printf(seq, ",resgid=%u",
 622                                 from_kgid_munged(&init_user_ns, sbi->s_resgid));
 623         }
 624         if (test_opt(sb, ERRORS_RO)) {
 625                 int def_errors = le16_to_cpu(es->s_errors);
 626
 627                 if (def_errors == EXT3_ERRORS_PANIC ||
 628                     def_errors == EXT3_ERRORS_CONTINUE) {
 629                         seq_puts(seq, ",errors=remount-ro");
 630                 }
 631         }
 632         if (test_opt(sb, ERRORS_CONT))
 633                 seq_puts(seq, ",errors=continue");
 634         if (test_opt(sb, ERRORS_PANIC))
 635                 seq_puts(seq, ",errors=panic");
 636         if (test_opt(sb, NO_UID32))
 637                 seq_puts(seq, ",nouid32");
 638         if (test_opt(sb, DEBUG))
 639                 seq_puts(seq, ",debug");
 640 #ifdef CONFIG_EXT3_FS_XATTR
 641         if (test_opt(sb, XATTR_USER))
 642                 seq_puts(seq, ",user_xattr");
 643         if (!test_opt(sb, XATTR_USER) &&
 644             (def_mount_opts & EXT3_DEFM_XATTR_USER)) {
 645                 seq_puts(seq, ",nouser_xattr");
 646         }
 647 #endif
 648 #ifdef CONFIG_EXT3_FS_POSIX_ACL
 649         if (test_opt(sb, POSIX_ACL))
 650                 seq_puts(seq, ",acl");
 651         if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT3_DEFM_ACL))
 652                 seq_puts(seq, ",noacl");
 653 #endif
 654         if (!test_opt(sb, RESERVATION))
 655                 seq_puts(seq, ",noreservation");
 656         if (sbi->s_commit_interval) {
 657                 seq_printf(seq, ",commit=%u",
 658                            (unsigned) (sbi->s_commit_interval / HZ));
 659         }
 660
 661         /*
 662          * Always display barrier state so it's clear what the status is.
 663          */
 664         seq_puts(seq, ",barrier=");
 665         seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
 666         seq_printf(seq, ",data=%s", data_mode_string(test_opt(sb, DATA_FLAGS)));
 667         if (test_opt(sb, DATA_ERR_ABORT))
 668                 seq_puts(seq, ",data_err=abort");
 669
 670         if (test_opt(sb, NOLOAD))
 671                 seq_puts(seq, ",norecovery");
 672
 673         ext3_show_quota_options(seq, sb);
 674
 675         return 0;
 676 }
 677
 678
 679 static struct inode *ext3_nfs_get_inode(struct super_block *sb,
 680                 u64 ino, u32 generation)
 681 {
 682         struct inode *inode;
 683
 684         if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO)
 685                 return ERR_PTR(-ESTALE);
 686         if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count))
 687                 return ERR_PTR(-ESTALE);
 688
 689         /* iget isn't really right if the inode is currently unallocated!!
 690          *
 691          * ext3_read_inode will return a bad_inode if the inode had been
 692          * deleted, so we should be safe.
 693          *
 694          * Currently we don't know the generation for parent directory, so
 695          * a generation of 0 means "accept any"
 696          */
 697         inode = ext3_iget(sb, ino);
 698         if (IS_ERR(inode))
 699                 return ERR_CAST(inode);
 700         if (generation && inode->i_generation != generation) {
 701                 iput(inode);
 702                 return ERR_PTR(-ESTALE);
 703         }
 704
 705         return inode;
 706 }
 707
 708 static struct dentry *ext3_fh_to_dentry(struct super_block *sb, struct fid *fid,
 709                 int fh_len, int fh_type)
 710 {
 711         return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
 712                                     ext3_nfs_get_inode);
 713 }
 714
 715 static struct dentry *ext3_fh_to_parent(struct super_block *sb, struct fid *fid,
 716                 int fh_len, int fh_type)
 717 {
 718         return generic_fh_to_parent(sb, fid, fh_len, fh_type,
 719                                     ext3_nfs_get_inode);
 720 }
 721
 722 /*
 723  * Try to release metadata pages (indirect blocks, directories) which are
 724  * mapped via the block device.  Since these pages could have journal heads
 725  * which would prevent try_to_free_buffers() from freeing them, we must use
 726  * jbd layer's try_to_free_buffers() function to release them.
 727  */
 728 static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
 729                                  gfp_t wait)
 730 {
 731         journal_t *journal = EXT3_SB(sb)->s_journal;
 732
 733         WARN_ON(PageChecked(page));
 734         if (!page_has_buffers(page))
 735                 return 0;
 736         if (journal)
 737                 return journal_try_to_free_buffers(journal, page,
 738                                                    wait & ~__GFP_WAIT);
 739         return try_to_free_buffers(page);
 740 }
 741
 742 #ifdef CONFIG_QUOTA
 743 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
 744 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
 745
 746 static int ext3_write_dquot(struct dquot *dquot);
 747 static int ext3_acquire_dquot(struct dquot *dquot);
 748 static int ext3_release_dquot(struct dquot *dquot);
 749 static int ext3_mark_dquot_dirty(struct dquot *dquot);
 750 static int ext3_write_info(struct super_block *sb, int type);
 751 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
 752                          struct path *path);
 753 static int ext3_quota_on_mount(struct super_block *sb, int type);
 754 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
 755                                size_t len, loff_t off);
 756 static ssize_t ext3_quota_write(struct super_block *sb, int type,
 757                                 const char *data, size_t len, loff_t off);
 758
 759 static const struct dquot_operations ext3_quota_operations = {
 760         .write_dquot    = ext3_write_dquot,
 761         .acquire_dquot  = ext3_acquire_dquot,
 762         .release_dquot  = ext3_release_dquot,
 763         .mark_dirty     = ext3_mark_dquot_dirty,
 764         .write_info     = ext3_write_info,
 765         .alloc_dquot    = dquot_alloc,
 766         .destroy_dquot  = dquot_destroy,
 767 };
 768
 769 static const struct quotactl_ops ext3_qctl_operations = {
 770         .quota_on       = ext3_quota_on,
 771         .quota_off      = dquot_quota_off,
 772         .quota_sync     = dquot_quota_sync,
 773         .get_info       = dquot_get_dqinfo,
 774         .set_info       = dquot_set_dqinfo,
 775         .get_dqblk      = dquot_get_dqblk,
 776         .set_dqblk      = dquot_set_dqblk
 777 };
 778 #endif
 779
 780 static const struct super_operations ext3_sops = {
 781         .alloc_inode    = ext3_alloc_inode,
 782         .destroy_inode  = ext3_destroy_inode,
 783         .write_inode    = ext3_write_inode,
 784         .dirty_inode    = ext3_dirty_inode,
 785         .drop_inode     = ext3_drop_inode,
 786         .evict_inode    = ext3_evict_inode,
 787         .put_super      = ext3_put_super,
 788         .sync_fs        = ext3_sync_fs,
 789         .freeze_fs      = ext3_freeze,
 790         .unfreeze_fs    = ext3_unfreeze,
 791         .statfs         = ext3_statfs,
 792         .remount_fs     = ext3_remount,
 793         .show_options   = ext3_show_options,
 794 #ifdef CONFIG_QUOTA
 795         .quota_read     = ext3_quota_read,
 796         .quota_write    = ext3_quota_write,
 797 #endif
 798         .bdev_try_to_free_page = bdev_try_to_free_page,
 799 };
 800
 801 static const struct export_operations ext3_export_ops = {
 802         .fh_to_dentry = ext3_fh_to_dentry,
 803         .fh_to_parent = ext3_fh_to_parent,
 804         .get_parent = ext3_get_parent,
 805 };
 806
 807 enum {
 808         Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
 809         Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
 810         Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
 811         Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
 812         Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
 813         Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
 814         Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
 815         Opt_data_err_abort, Opt_data_err_ignore,
 816         Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
 817         Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
 818         Opt_noquota, Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err,
 819         Opt_resize, Opt_usrquota, Opt_grpquota
 820 };
 821
 822 static const match_table_t tokens = {
 823         {Opt_bsd_df, "bsddf"},
 824         {Opt_minix_df, "minixdf"},
 825         {Opt_grpid, "grpid"},
 826         {Opt_grpid, "bsdgroups"},
 827         {Opt_nogrpid, "nogrpid"},
 828         {Opt_nogrpid, "sysvgroups"},
 829         {Opt_resgid, "resgid=%u"},
 830         {Opt_resuid, "resuid=%u"},
 831         {Opt_sb, "sb=%u"},
 832         {Opt_err_cont, "errors=continue"},
 833         {Opt_err_panic, "errors=panic"},
 834         {Opt_err_ro, "errors=remount-ro"},
 835         {Opt_nouid32, "nouid32"},
 836         {Opt_nocheck, "nocheck"},
 837         {Opt_nocheck, "check=none"},
 838         {Opt_debug, "debug"},
 839         {Opt_oldalloc, "oldalloc"},
 840         {Opt_orlov, "orlov"},
 841         {Opt_user_xattr, "user_xattr"},
 842         {Opt_nouser_xattr, "nouser_xattr"},
 843         {Opt_acl, "acl"},
 844         {Opt_noacl, "noacl"},
 845         {Opt_reservation, "reservation"},
 846         {Opt_noreservation, "noreservation"},
 847         {Opt_noload, "noload"},
 848         {Opt_noload, "norecovery"},
 849         {Opt_nobh, "nobh"},
 850         {Opt_bh, "bh"},
 851         {Opt_commit, "commit=%u"},
 852         {Opt_journal_update, "journal=update"},
 853         {Opt_journal_inum, "journal=%u"},
 854         {Opt_journal_dev, "journal_dev=%u"},
 855         {Opt_abort, "abort"},
 856         {Opt_data_journal, "data=journal"},
 857         {Opt_data_ordered, "data=ordered"},
 858         {Opt_data_writeback, "data=writeback"},
 859         {Opt_data_err_abort, "data_err=abort"},
 860         {Opt_data_err_ignore, "data_err=ignore"},
 861         {Opt_offusrjquota, "usrjquota="},
 862         {Opt_usrjquota, "usrjquota=%s"},
 863         {Opt_offgrpjquota, "grpjquota="},
 864         {Opt_grpjquota, "grpjquota=%s"},
 865         {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
 866         {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
 867         {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
 868         {Opt_grpquota, "grpquota"},
 869         {Opt_noquota, "noquota"},
 870         {Opt_quota, "quota"},
 871         {Opt_usrquota, "usrquota"},
 872         {Opt_barrier, "barrier=%u"},
 873         {Opt_barrier, "barrier"},
 874         {Opt_nobarrier, "nobarrier"},
 875         {Opt_resize, "resize"},
 876         {Opt_err, NULL},
 877 };
 878
 879 static ext3_fsblk_t get_sb_block(void **data, struct super_block *sb)
 880 {
 881         ext3_fsblk_t    sb_block;
 882         char            *options = (char *) *data;
 883
 884         if (!options || strncmp(options, "sb=", 3) != 0)
 885                 return 1;       /* Default location */
 886         options += 3;
 887         /*todo: use simple_strtoll with >32bit ext3 */
 888         sb_block = simple_strtoul(options, &options, 0);
 889         if (*options && *options != ',') {
 890                 ext3_msg(sb, "error: invalid sb specification: %s",
 891                        (char *) *data);
 892                 return 1;
 893         }
 894         if (*options == ',')
 895                 options++;
 896         *data = (void *) options;
 897         return sb_block;
 898 }
 899
 900 #ifdef CONFIG_QUOTA
 901 static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
 902 {
 903         struct ext3_sb_info *sbi = EXT3_SB(sb);
 904         char *qname;
 905
 906         if (sb_any_quota_loaded(sb) &&
 907                 !sbi->s_qf_names[qtype]) {
 908                 ext3_msg(sb, KERN_ERR,
 909                         "Cannot change journaled "
 910                         "quota options when quota turned on");
 911                 return 0;
 912         }
 913         qname = match_strdup(args);
 914         if (!qname) {
 915                 ext3_msg(sb, KERN_ERR,
 916                         "Not enough memory for storing quotafile name");
 917                 return 0;
 918         }
 919         if (sbi->s_qf_names[qtype] &&
 920                 strcmp(sbi->s_qf_names[qtype], qname)) {
 921                 ext3_msg(sb, KERN_ERR,
 922                         "%s quota file already specified", QTYPE2NAME(qtype));
 923                 kfree(qname);
 924                 return 0;
 925         }
 926         sbi->s_qf_names[qtype] = qname;
 927         if (strchr(sbi->s_qf_names[qtype], '/')) {
 928                 ext3_msg(sb, KERN_ERR,
 929                         "quotafile must be on filesystem root");
 930                 kfree(sbi->s_qf_names[qtype]);
 931                 sbi->s_qf_names[qtype] = NULL;
 932                 return 0;
 933         }
 934         set_opt(sbi->s_mount_opt, QUOTA);
 935         return 1;
 936 }
 937
 938 static int clear_qf_name(struct super_block *sb, int qtype) {
 939
 940         struct ext3_sb_info *sbi = EXT3_SB(sb);
 941
 942         if (sb_any_quota_loaded(sb) &&
 943                 sbi->s_qf_names[qtype]) {
 944                 ext3_msg(sb, KERN_ERR, "Cannot change journaled quota options"
 945                         " when quota turned on");
 946                 return 0;
 947         }
 948         /*
 949          * The space will be released later when all options are confirmed
 950          * to be correct
 951          */
 952         sbi->s_qf_names[qtype] = NULL;
 953         return 1;
 954 }
 955 #endif
 956
 957 static int parse_options (char *options, struct super_block *sb,
 958                           unsigned int *inum, unsigned long *journal_devnum,
 959                           ext3_fsblk_t *n_blocks_count, int is_remount)
 960 {
 961         struct ext3_sb_info *sbi = EXT3_SB(sb);
 962         char * p;
 963         substring_t args[MAX_OPT_ARGS];
 964         int data_opt = 0;
 965         int option;
 966         kuid_t uid;
 967         kgid_t gid;
 968 #ifdef CONFIG_QUOTA
 969         int qfmt;
 970 #endif
 971
 972         if (!options)
 973                 return 1;
 974
 975         while ((p = strsep (&options, ",")) != NULL) {
 976                 int token;
 977                 if (!*p)
 978                         continue;
 979                 /*
 980                  * Initialize args struct so we know whether arg was
 981                  * found; some options take optional arguments.
 982                  */
 983                 args[0].to = args[0].from = NULL;
 984                 token = match_token(p, tokens, args);
 985                 switch (token) {
 986                 case Opt_bsd_df:
 987                         clear_opt (sbi->s_mount_opt, MINIX_DF);
 988                         break;
 989                 case Opt_minix_df:
 990                         set_opt (sbi->s_mount_opt, MINIX_DF);
 991                         break;
 992                 case Opt_grpid:
 993                         set_opt (sbi->s_mount_opt, GRPID);
 994                         break;
 995                 case Opt_nogrpid:
 996                         clear_opt (sbi->s_mount_opt, GRPID);
 997                         break;
 998                 case Opt_resuid:
 999                         if (match_int(&args[0], &option))
1000                                 return 0;
1001                         uid = make_kuid(current_user_ns(), option);
1002                         if (!uid_valid(uid)) {
1003                                 ext3_msg(sb, KERN_ERR, "Invalid uid value %d", option);
1004                                 return -1;
1005
1006                         }
1007                         sbi->s_resuid = uid;
1008                         break;
1009                 case Opt_resgid:
1010                         if (match_int(&args[0], &option))
1011                                 return 0;
1012                         gid = make_kgid(current_user_ns(), option);
1013                         if (!gid_valid(gid)) {
1014                                 ext3_msg(sb, KERN_ERR, "Invalid gid value %d", option);
1015                                 return -1;
1016                         }
1017                         sbi->s_resgid = gid;
1018                         break;
1019                 case Opt_sb:
1020                         /* handled by get_sb_block() instead of here */
1021                         /* *sb_block = match_int(&args[0]); */
1022                         break;
1023                 case Opt_err_panic:
1024                         clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1025                         clear_opt (sbi->s_mount_opt, ERRORS_RO);
1026                         set_opt (sbi->s_mount_opt, ERRORS_PANIC);
1027                         break;
1028                 case Opt_err_ro:
1029                         clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1030                         clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1031                         set_opt (sbi->s_mount_opt, ERRORS_RO);
1032                         break;
1033                 case Opt_err_cont:
1034                         clear_opt (sbi->s_mount_opt, ERRORS_RO);
1035                         clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1036                         set_opt (sbi->s_mount_opt, ERRORS_CONT);
1037                         break;
1038                 case Opt_nouid32:
1039                         set_opt (sbi->s_mount_opt, NO_UID32);
1040                         break;
1041                 case Opt_nocheck:
1042                         clear_opt (sbi->s_mount_opt, CHECK);
1043                         break;
1044                 case Opt_debug:
1045                         set_opt (sbi->s_mount_opt, DEBUG);
1046                         break;
1047                 case Opt_oldalloc:
1048                         ext3_msg(sb, KERN_WARNING,
1049                                 "Ignoring deprecated oldalloc option");
1050                         break;
1051                 case Opt_orlov:
1052                         ext3_msg(sb, KERN_WARNING,
1053                                 "Ignoring deprecated orlov option");
1054                         break;
1055 #ifdef CONFIG_EXT3_FS_XATTR
1056                 case Opt_user_xattr:
1057                         set_opt (sbi->s_mount_opt, XATTR_USER);
1058                         break;
1059                 case Opt_nouser_xattr:
1060                         clear_opt (sbi->s_mount_opt, XATTR_USER);
1061                         break;
1062 #else
1063                 case Opt_user_xattr:
1064                 case Opt_nouser_xattr:
1065                         ext3_msg(sb, KERN_INFO,
1066                                 "(no)user_xattr options not supported");
1067                         break;
1068 #endif
1069 #ifdef CONFIG_EXT3_FS_POSIX_ACL
1070                 case Opt_acl:
1071                         set_opt(sbi->s_mount_opt, POSIX_ACL);
1072                         break;
1073                 case Opt_noacl:
1074                         clear_opt(sbi->s_mount_opt, POSIX_ACL);
1075                         break;
1076 #else
1077                 case Opt_acl:
1078                 case Opt_noacl:
1079                         ext3_msg(sb, KERN_INFO,
1080                                 "(no)acl options not supported");
1081                         break;
1082 #endif
1083                 case Opt_reservation:
1084                         set_opt(sbi->s_mount_opt, RESERVATION);
1085                         break;
1086                 case Opt_noreservation:
1087                         clear_opt(sbi->s_mount_opt, RESERVATION);
1088                         break;
1089                 case Opt_journal_update:
1090                         /* @@@ FIXME */
1091                         /* Eventually we will want to be able to create
1092                            a journal file here.  For now, only allow the
1093                            user to specify an existing inode to be the
1094                            journal file. */
1095                         if (is_remount) {
1096                                 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1097                                         "journal on remount");
1098                                 return 0;
1099                         }
1100                         set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
1101                         break;
1102                 case Opt_journal_inum:
1103                         if (is_remount) {
1104                                 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1105                                        "journal on remount");
1106                                 return 0;
1107                         }
1108                         if (match_int(&args[0], &option))
1109                                 return 0;
1110                         *inum = option;
1111                         break;
1112                 case Opt_journal_dev:
1113                         if (is_remount) {
1114                                 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1115                                        "journal on remount");
1116                                 return 0;
1117                         }
1118                         if (match_int(&args[0], &option))
1119                                 return 0;
1120                         *journal_devnum = option;
1121                         break;
1122                 case Opt_noload:
1123                         set_opt (sbi->s_mount_opt, NOLOAD);
1124                         break;
1125                 case Opt_commit:
1126                         if (match_int(&args[0], &option))
1127                                 return 0;
1128                         if (option < 0)
1129                                 return 0;
1130                         if (option == 0)
1131                                 option = JBD_DEFAULT_MAX_COMMIT_AGE;
1132                         sbi->s_commit_interval = HZ * option;
1133                         break;
1134                 case Opt_data_journal:
1135                         data_opt = EXT3_MOUNT_JOURNAL_DATA;
1136                         goto datacheck;
1137                 case Opt_data_ordered:
1138                         data_opt = EXT3_MOUNT_ORDERED_DATA;
1139                         goto datacheck;
1140                 case Opt_data_writeback:
1141                         data_opt = EXT3_MOUNT_WRITEBACK_DATA;
1142                 datacheck:
1143                         if (is_remount) {
1144                                 if (test_opt(sb, DATA_FLAGS) == data_opt)
1145                                         break;
1146                                 ext3_msg(sb, KERN_ERR,
1147                                         "error: cannot change "
1148                                         "data mode on remount. The filesystem "
1149                                         "is mounted in data=%s mode and you "
1150                                         "try to remount it in data=%s mode.",
1151                                         data_mode_string(test_opt(sb,
1152                                                         DATA_FLAGS)),
1153                                         data_mode_string(data_opt));
1154                                 return 0;
1155                         } else {
1156                                 clear_opt(sbi->s_mount_opt, DATA_FLAGS);
1157                                 sbi->s_mount_opt |= data_opt;
1158                         }
1159                         break;
1160                 case Opt_data_err_abort:
1161                         set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1162                         break;
1163                 case Opt_data_err_ignore:
1164                         clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1165                         break;
1166 #ifdef CONFIG_QUOTA
1167                 case Opt_usrjquota:
1168                         if (!set_qf_name(sb, USRQUOTA, &args[0]))
1169                                 return 0;
1170                         break;
1171                 case Opt_grpjquota:
1172                         if (!set_qf_name(sb, GRPQUOTA, &args[0]))
1173                                 return 0;
1174                         break;
1175                 case Opt_offusrjquota:
1176                         if (!clear_qf_name(sb, USRQUOTA))
1177                                 return 0;
1178                         break;
1179                 case Opt_offgrpjquota:
1180                         if (!clear_qf_name(sb, GRPQUOTA))
1181                                 return 0;
1182                         break;
1183                 case Opt_jqfmt_vfsold:
1184                         qfmt = QFMT_VFS_OLD;
1185                         goto set_qf_format;
1186                 case Opt_jqfmt_vfsv0:
1187                         qfmt = QFMT_VFS_V0;
1188                         goto set_qf_format;
1189                 case Opt_jqfmt_vfsv1:
1190                         qfmt = QFMT_VFS_V1;
1191 set_qf_format:
1192                         if (sb_any_quota_loaded(sb) &&
1193                             sbi->s_jquota_fmt != qfmt) {
1194                                 ext3_msg(sb, KERN_ERR, "error: cannot change "
1195                                         "journaled quota options when "
1196                                         "quota turned on.");
1197                                 return 0;
1198                         }
1199                         sbi->s_jquota_fmt = qfmt;
1200                         break;
1201                 case Opt_quota:
1202                 case Opt_usrquota:
1203                         set_opt(sbi->s_mount_opt, QUOTA);
1204                         set_opt(sbi->s_mount_opt, USRQUOTA);
1205                         break;
1206                 case Opt_grpquota:
1207                         set_opt(sbi->s_mount_opt, QUOTA);
1208                         set_opt(sbi->s_mount_opt, GRPQUOTA);
1209                         break;
1210                 case Opt_noquota:
1211                         if (sb_any_quota_loaded(sb)) {
1212                                 ext3_msg(sb, KERN_ERR, "error: cannot change "
1213                                         "quota options when quota turned on.");
1214                                 return 0;
1215                         }
1216                         clear_opt(sbi->s_mount_opt, QUOTA);
1217                         clear_opt(sbi->s_mount_opt, USRQUOTA);
1218                         clear_opt(sbi->s_mount_opt, GRPQUOTA);
1219                         break;
1220 #else
1221                 case Opt_quota:
1222                 case Opt_usrquota:
1223                 case Opt_grpquota:
1224                         ext3_msg(sb, KERN_ERR,
1225                                 "error: quota options not supported.");
1226                         break;
1227                 case Opt_usrjquota:
1228                 case Opt_grpjquota:
1229                 case Opt_offusrjquota:
1230                 case Opt_offgrpjquota:
1231                 case Opt_jqfmt_vfsold:
1232                 case Opt_jqfmt_vfsv0:
1233                 case Opt_jqfmt_vfsv1:
1234                         ext3_msg(sb, KERN_ERR,
1235                                 "error: journaled quota options not "
1236                                 "supported.");
1237                         break;
1238                 case Opt_noquota:
1239                         break;
1240 #endif
1241                 case Opt_abort:
1242                         set_opt(sbi->s_mount_opt, ABORT);
1243                         break;
1244                 case Opt_nobarrier:
1245                         clear_opt(sbi->s_mount_opt, BARRIER);
1246                         break;
1247                 case Opt_barrier:
1248                         if (args[0].from) {
1249                                 if (match_int(&args[0], &option))
1250                                         return 0;
1251                         } else
1252                                 option = 1;     /* No argument, default to 1 */
1253                         if (option)
1254                                 set_opt(sbi->s_mount_opt, BARRIER);
1255                         else
1256                                 clear_opt(sbi->s_mount_opt, BARRIER);
1257                         break;
1258                 case Opt_ignore:
1259                         break;
1260                 case Opt_resize:
1261                         if (!is_remount) {
1262                                 ext3_msg(sb, KERN_ERR,
1263                                         "error: resize option only available "
1264                                         "for remount");
1265                                 return 0;
1266                         }
1267                         if (match_int(&args[0], &option) != 0)
1268                                 return 0;
1269                         *n_blocks_count = option;
1270                         break;
1271                 case Opt_nobh:
1272                         ext3_msg(sb, KERN_WARNING,
1273                                 "warning: ignoring deprecated nobh option");
1274                         break;
1275                 case Opt_bh:
1276                         ext3_msg(sb, KERN_WARNING,
1277                                 "warning: ignoring deprecated bh option");
1278                         break;
1279                 default:
1280                         ext3_msg(sb, KERN_ERR,
1281                                 "error: unrecognized mount option \"%s\" "
1282                                 "or missing value", p);
1283                         return 0;
1284                 }
1285         }
1286 #ifdef CONFIG_QUOTA
1287         if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1288                 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
1289                         clear_opt(sbi->s_mount_opt, USRQUOTA);
1290                 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
1291                         clear_opt(sbi->s_mount_opt, GRPQUOTA);
1292
1293                 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
1294                         ext3_msg(sb, KERN_ERR, "error: old and new quota "
1295                                         "format mixing.");
1296                         return 0;
1297                 }
1298
1299                 if (!sbi->s_jquota_fmt) {
1300                         ext3_msg(sb, KERN_ERR, "error: journaled quota format "
1301                                         "not specified.");
1302                         return 0;
1303                 }
1304         } else {
1305                 if (sbi->s_jquota_fmt) {
1306                         ext3_msg(sb, KERN_ERR, "error: journaled quota format "
1307                                         "specified with no journaling "
1308                                         "enabled.");
1309                         return 0;
1310                 }
1311         }
1312 #endif
1313         return 1;
1314 }
1315
1316 static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1317                             int read_only)
1318 {
1319         struct ext3_sb_info *sbi = EXT3_SB(sb);
1320         int res = 0;
1321
1322         if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
1323                 ext3_msg(sb, KERN_ERR,
1324                         "error: revision level too high, "
1325                         "forcing read-only mode");
1326                 res = MS_RDONLY;
1327         }
1328         if (read_only)
1329                 return res;
1330         if (!(sbi->s_mount_state & EXT3_VALID_FS))
1331                 ext3_msg(sb, KERN_WARNING,
1332                         "warning: mounting unchecked fs, "
1333                         "running e2fsck is recommended");
1334         else if ((sbi->s_mount_state & EXT3_ERROR_FS))
1335                 ext3_msg(sb, KERN_WARNING,
1336                         "warning: mounting fs with errors, "
1337                         "running e2fsck is recommended");
1338         else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
1339                  le16_to_cpu(es->s_mnt_count) >=
1340                         le16_to_cpu(es->s_max_mnt_count))
1341                 ext3_msg(sb, KERN_WARNING,
1342                         "warning: maximal mount count reached, "
1343                         "running e2fsck is recommended");
1344         else if (le32_to_cpu(es->s_checkinterval) &&
1345                 (le32_to_cpu(es->s_lastcheck) +
1346                         le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1347                 ext3_msg(sb, KERN_WARNING,
1348                         "warning: checktime reached, "
1349                         "running e2fsck is recommended");
1350 #if 0
1351                 /* @@@ We _will_ want to clear the valid bit if we find
1352                    inconsistencies, to force a fsck at reboot.  But for
1353                    a plain journaled filesystem we can keep it set as
1354                    valid forever! :) */
1355         es->s_state &= cpu_to_le16(~EXT3_VALID_FS);
1356 #endif
1357         if (!le16_to_cpu(es->s_max_mnt_count))
1358                 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
1359         le16_add_cpu(&es->s_mnt_count, 1);
1360         es->s_mtime = cpu_to_le32(get_seconds());
1361         ext3_update_dynamic_rev(sb);
1362         EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1363
1364         ext3_commit_super(sb, es, 1);
1365         if (test_opt(sb, DEBUG))
1366                 ext3_msg(sb, KERN_INFO, "[bs=%lu, gc=%lu, "
1367                                 "bpg=%lu, ipg=%lu, mo=%04lx]",
1368                         sb->s_blocksize,
1369                         sbi->s_groups_count,
1370                         EXT3_BLOCKS_PER_GROUP(sb),
1371                         EXT3_INODES_PER_GROUP(sb),
1372                         sbi->s_mount_opt);
1373
1374         if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1375                 char b[BDEVNAME_SIZE];
1376                 ext3_msg(sb, KERN_INFO, "using external journal on %s",
1377                         bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1378         } else {
1379                 ext3_msg(sb, KERN_INFO, "using internal journal");
1380         }
1381         cleancache_init_fs(sb);
1382         return res;
1383 }
1384
1385 /* Called at mount-time, super-block is locked */
1386 static int ext3_check_descriptors(struct super_block *sb)
1387 {
1388         struct ext3_sb_info *sbi = EXT3_SB(sb);
1389         int i;
1390
1391         ext3_debug ("Checking group descriptors");
1392
1393         for (i = 0; i < sbi->s_groups_count; i++) {
1394                 struct ext3_group_desc *gdp = ext3_get_group_desc(sb, i, NULL);
1395                 ext3_fsblk_t first_block = ext3_group_first_block_no(sb, i);
1396                 ext3_fsblk_t last_block;
1397
1398                 if (i == sbi->s_groups_count - 1)
1399                         last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
1400                 else
1401                         last_block = first_block +
1402                                 (EXT3_BLOCKS_PER_GROUP(sb) - 1);
1403
1404                 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
1405                     le32_to_cpu(gdp->bg_block_bitmap) > last_block)
1406                 {
1407                         ext3_error (sb, "ext3_check_descriptors",
1408                                     "Block bitmap for group %d"
1409                                     " not in group (block %lu)!",
1410                                     i, (unsigned long)
1411                                         le32_to_cpu(gdp->bg_block_bitmap));
1412                         return 0;
1413                 }
1414                 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
1415                     le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
1416                 {
1417                         ext3_error (sb, "ext3_check_descriptors",
1418                                     "Inode bitmap for group %d"
1419                                     " not in group (block %lu)!",
1420                                     i, (unsigned long)
1421                                         le32_to_cpu(gdp->bg_inode_bitmap));
1422                         return 0;
1423                 }
1424                 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
1425                     le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
1426                     last_block)
1427                 {
1428                         ext3_error (sb, "ext3_check_descriptors",
1429                                     "Inode table for group %d"
1430                                     " not in group (block %lu)!",
1431                                     i, (unsigned long)
1432                                         le32_to_cpu(gdp->bg_inode_table));
1433                         return 0;
1434                 }
1435         }
1436
1437         sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1438         sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1439         return 1;
1440 }
1441
1442
1443 /* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1444  * the superblock) which were deleted from all directories, but held open by
1445  * a process at the time of a crash.  We walk the list and try to delete these
1446  * inodes at recovery time (only with a read-write filesystem).
1447  *
1448  * In order to keep the orphan inode chain consistent during traversal (in
1449  * case of crash during recovery), we link each inode into the superblock
1450  * orphan list_head and handle it the same way as an inode deletion during
1451  * normal operation (which journals the operations for us).
1452  *
1453  * We only do an iget() and an iput() on each inode, which is very safe if we
1454  * accidentally point at an in-use or already deleted inode.  The worst that
1455  * can happen in this case is that we get a "bit already cleared" message from
1456  * ext3_free_inode().  The only reason we would point at a wrong inode is if
1457  * e2fsck was run on this filesystem, and it must have already done the orphan
1458  * inode cleanup for us, so we can safely abort without any further action.
1459  */
1460 static void ext3_orphan_cleanup (struct super_block * sb,
1461                                  struct ext3_super_block * es)
1462 {
1463         unsigned int s_flags = sb->s_flags;
1464         int nr_orphans = 0, nr_truncates = 0;
1465 #ifdef CONFIG_QUOTA
1466         int i;
1467 #endif
1468         if (!es->s_last_orphan) {
1469                 jbd_debug(4, "no orphan inodes to clean up\n");
1470                 return;
1471         }
1472
1473         if (bdev_read_only(sb->s_bdev)) {
1474                 ext3_msg(sb, KERN_ERR, "error: write access "
1475                         "unavailable, skipping orphan cleanup.");
1476                 return;
1477         }
1478
1479         /* Check if feature set allows readwrite operations */
1480         if (EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP)) {
1481                 ext3_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
1482                          "unknown ROCOMPAT features");
1483                 return;
1484         }
1485
1486         if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1487                 /* don't clear list on RO mount w/ errors */
1488                 if (es->s_last_orphan && !(s_flags & MS_RDONLY)) {
1489                         jbd_debug(1, "Errors on filesystem, "
1490                                   "clearing orphan list.\n");
1491                         es->s_last_orphan = 0;
1492                 }
1493                 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1494                 return;
1495         }
1496
1497         if (s_flags & MS_RDONLY) {
1498                 ext3_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
1499                 sb->s_flags &= ~MS_RDONLY;
1500         }
1501 #ifdef CONFIG_QUOTA
1502         /* Needed for iput() to work correctly and not trash data */
1503         sb->s_flags |= MS_ACTIVE;
1504         /* Turn on quotas so that they are updated correctly */
1505         for (i = 0; i < MAXQUOTAS; i++) {
1506                 if (EXT3_SB(sb)->s_qf_names[i]) {
1507                         int ret = ext3_quota_on_mount(sb, i);
1508                         if (ret < 0)
1509                                 ext3_msg(sb, KERN_ERR,
1510                                         "error: cannot turn on journaled "
1511                                         "quota: %d", ret);
1512                 }
1513         }
1514 #endif
1515
1516         while (es->s_last_orphan) {
1517                 struct inode *inode;
1518
1519                 inode = ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1520                 if (IS_ERR(inode)) {
1521                         es->s_last_orphan = 0;
1522                         break;
1523                 }
1524
1525                 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1526                 dquot_initialize(inode);
1527                 if (inode->i_nlink) {
1528                         printk(KERN_DEBUG
1529                                 "%s: truncating inode %lu to %Ld bytes\n",
1530                                 __func__, inode->i_ino, inode->i_size);
1531                         jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1532                                   inode->i_ino, inode->i_size);
1533                         ext3_truncate(inode);
1534                         nr_truncates++;
1535                 } else {
1536                         printk(KERN_DEBUG
1537                                 "%s: deleting unreferenced inode %lu\n",
1538                                 __func__, inode->i_ino);
1539                         jbd_debug(2, "deleting unreferenced inode %lu\n",
1540                                   inode->i_ino);
1541                         nr_orphans++;
1542                 }
1543                 iput(inode);  /* The delete magic happens here! */
1544         }
1545
1546 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1547
1548         if (nr_orphans)
1549                 ext3_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
1550                        PLURAL(nr_orphans));
1551         if (nr_truncates)
1552                 ext3_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
1553                        PLURAL(nr_truncates));
1554 #ifdef CONFIG_QUOTA
1555         /* Turn quotas off */
1556         for (i = 0; i < MAXQUOTAS; i++) {
1557                 if (sb_dqopt(sb)->files[i])
1558                         dquot_quota_off(sb, i);
1559         }
1560 #endif
1561         sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1562 }
1563
1564 /*
1565  * Maximal file size.  There is a direct, and {,double-,triple-}indirect
1566  * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1567  * We need to be 1 filesystem block less than the 2^32 sector limit.
1568  */
1569 static loff_t ext3_max_size(int bits)
1570 {
1571         loff_t res = EXT3_NDIR_BLOCKS;
1572         int meta_blocks;
1573         loff_t upper_limit;
1574
1575         /* This is calculated to be the largest file size for a
1576          * dense, file such that the total number of
1577          * sectors in the file, including data and all indirect blocks,
1578          * does not exceed 2^32 -1
1579          * __u32 i_blocks representing the total number of
1580          * 512 bytes blocks of the file
1581          */
1582         upper_limit = (1LL << 32) - 1;
1583
1584         /* total blocks in file system block size */
1585         upper_limit >>= (bits - 9);
1586
1587
1588         /* indirect blocks */
1589         meta_blocks = 1;
1590         /* double indirect blocks */
1591         meta_blocks += 1 + (1LL << (bits-2));
1592         /* tripple indirect blocks */
1593         meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1594
1595         upper_limit -= meta_blocks;
1596         upper_limit <<= bits;
1597
1598         res += 1LL << (bits-2);
1599         res += 1LL << (2*(bits-2));
1600         res += 1LL << (3*(bits-2));
1601         res <<= bits;
1602         if (res > upper_limit)
1603                 res = upper_limit;
1604
1605         if (res > MAX_LFS_FILESIZE)
1606                 res = MAX_LFS_FILESIZE;
1607
1608         return res;
1609 }
1610
1611 static ext3_fsblk_t descriptor_loc(struct super_block *sb,
1612                                     ext3_fsblk_t logic_sb_block,
1613                                     int nr)
1614 {
1615         struct ext3_sb_info *sbi = EXT3_SB(sb);
1616         unsigned long bg, first_meta_bg;
1617         int has_super = 0;
1618
1619         first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1620
1621         if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1622             nr < first_meta_bg)
1623                 return (logic_sb_block + nr + 1);
1624         bg = sbi->s_desc_per_block * nr;
1625         if (ext3_bg_has_super(sb, bg))
1626                 has_super = 1;
1627         return (has_super + ext3_group_first_block_no(sb, bg));
1628 }
1629
1630
1631 static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1632 {
1633         struct buffer_head * bh;
1634         struct ext3_super_block *es = NULL;
1635         struct ext3_sb_info *sbi;
1636         ext3_fsblk_t block;
1637         ext3_fsblk_t sb_block = get_sb_block(&data, sb);
1638         ext3_fsblk_t logic_sb_block;
1639         unsigned long offset = 0;
1640         unsigned int journal_inum = 0;
1641         unsigned long journal_devnum = 0;
1642         unsigned long def_mount_opts;
1643         struct inode *root;
1644         int blocksize;
1645         int hblock;
1646         int db_count;
1647         int i;
1648         int needs_recovery;
1649         int ret = -EINVAL;
1650         __le32 features;
1651         int err;
1652
1653         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1654         if (!sbi)
1655                 return -ENOMEM;
1656
1657         sbi->s_blockgroup_lock =
1658                 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
1659         if (!sbi->s_blockgroup_lock) {
1660                 kfree(sbi);
1661                 return -ENOMEM;
1662         }
1663         sb->s_fs_info = sbi;
1664         sbi->s_mount_opt = 0;
1665         sbi->s_resuid = make_kuid(&init_user_ns, EXT3_DEF_RESUID);
1666         sbi->s_resgid = make_kgid(&init_user_ns, EXT3_DEF_RESGID);
1667         sbi->s_sb_block = sb_block;
1668
1669         blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1670         if (!blocksize) {
1671                 ext3_msg(sb, KERN_ERR, "error: unable to set blocksize");
1672                 goto out_fail;
1673         }
1674
1675         /*
1676          * The ext3 superblock will not be buffer aligned for other than 1kB
1677          * block sizes.  We need to calculate the offset from buffer start.
1678          */
1679         if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1680                 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1681                 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1682         } else {
1683                 logic_sb_block = sb_block;
1684         }
1685
1686         if (!(bh = sb_bread(sb, logic_sb_block))) {
1687                 ext3_msg(sb, KERN_ERR, "error: unable to read superblock");
1688                 goto out_fail;
1689         }
1690         /*
1691          * Note: s_es must be initialized as soon as possible because
1692          *       some ext3 macro-instructions depend on its value
1693          */
1694         es = (struct ext3_super_block *) (bh->b_data + offset);
1695         sbi->s_es = es;
1696         sb->s_magic = le16_to_cpu(es->s_magic);
1697         if (sb->s_magic != EXT3_SUPER_MAGIC)
1698                 goto cantfind_ext3;
1699
1700         /* Set defaults before we parse the mount options */
1701         def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1702         if (def_mount_opts & EXT3_DEFM_DEBUG)
1703                 set_opt(sbi->s_mount_opt, DEBUG);
1704         if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1705                 set_opt(sbi->s_mount_opt, GRPID);
1706         if (def_mount_opts & EXT3_DEFM_UID16)
1707                 set_opt(sbi->s_mount_opt, NO_UID32);
1708 #ifdef CONFIG_EXT3_FS_XATTR
1709         if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1710                 set_opt(sbi->s_mount_opt, XATTR_USER);
1711 #endif
1712 #ifdef CONFIG_EXT3_FS_POSIX_ACL
1713         if (def_mount_opts & EXT3_DEFM_ACL)
1714                 set_opt(sbi->s_mount_opt, POSIX_ACL);
1715 #endif
1716         if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1717                 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1718         else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1719                 set_opt(sbi->s_mount_opt, ORDERED_DATA);
1720         else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1721                 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
1722
1723         if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1724                 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1725         else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_CONTINUE)
1726                 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1727         else
1728                 set_opt(sbi->s_mount_opt, ERRORS_RO);
1729
1730         sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
1731         sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
1732
1733         /* enable barriers by default */
1734         set_opt(sbi->s_mount_opt, BARRIER);
1735         set_opt(sbi->s_mount_opt, RESERVATION);
1736
1737         if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1738                             NULL, 0))
1739                 goto failed_mount;
1740
1741         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1742                 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
1743
1744         if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1745             (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1746              EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1747              EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1748                 ext3_msg(sb, KERN_WARNING,
1749                         "warning: feature flags set on rev 0 fs, "
1750                         "running e2fsck is recommended");
1751         /*
1752          * Check feature flags regardless of the revision level, since we
1753          * previously didn't change the revision level when setting the flags,
1754          * so there is a chance incompat flags are set on a rev 0 filesystem.
1755          */
1756         features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1757         if (features) {
1758                 ext3_msg(sb, KERN_ERR,
1759                         "error: couldn't mount because of unsupported "
1760                         "optional features (%x)", le32_to_cpu(features));
1761                 goto failed_mount;
1762         }
1763         features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1764         if (!(sb->s_flags & MS_RDONLY) && features) {
1765                 ext3_msg(sb, KERN_ERR,
1766                         "error: couldn't mount RDWR because of unsupported "
1767                         "optional features (%x)", le32_to_cpu(features));
1768                 goto failed_mount;
1769         }
1770         blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1771
1772         if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1773             blocksize > EXT3_MAX_BLOCK_SIZE) {
1774                 ext3_msg(sb, KERN_ERR,
1775                         "error: couldn't mount because of unsupported "
1776                         "filesystem blocksize %d", blocksize);
1777                 goto failed_mount;
1778         }
1779
1780         hblock = bdev_logical_block_size(sb->s_bdev);
1781         if (sb->s_blocksize != blocksize) {
1782                 /*
1783                  * Make sure the blocksize for the filesystem is larger
1784                  * than the hardware sectorsize for the machine.
1785                  */
1786                 if (blocksize < hblock) {
1787                         ext3_msg(sb, KERN_ERR,
1788                                 "error: fsblocksize %d too small for "
1789                                 "hardware sectorsize %d", blocksize, hblock);
1790                         goto failed_mount;
1791                 }
1792
1793                 brelse (bh);
1794                 if (!sb_set_blocksize(sb, blocksize)) {
1795                         ext3_msg(sb, KERN_ERR,
1796                                 "error: bad blocksize %d", blocksize);
1797                         goto out_fail;
1798                 }
1799                 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1800                 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1801                 bh = sb_bread(sb, logic_sb_block);
1802                 if (!bh) {
1803                         ext3_msg(sb, KERN_ERR,
1804                                "error: can't read superblock on 2nd try");
1805                         goto failed_mount;
1806                 }
1807                 es = (struct ext3_super_block *)(bh->b_data + offset);
1808                 sbi->s_es = es;
1809                 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
1810                         ext3_msg(sb, KERN_ERR,
1811                                 "error: magic mismatch");
1812                         goto failed_mount;
1813                 }
1814         }
1815
1816         sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1817
1818         if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1819                 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1820                 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1821         } else {
1822                 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1823                 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1824                 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
1825                     (!is_power_of_2(sbi->s_inode_size)) ||
1826                     (sbi->s_inode_size > blocksize)) {
1827                         ext3_msg(sb, KERN_ERR,
1828                                 "error: unsupported inode size: %d",
1829                                 sbi->s_inode_size);
1830                         goto failed_mount;
1831                 }
1832         }
1833         sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1834                                    le32_to_cpu(es->s_log_frag_size);
1835         if (blocksize != sbi->s_frag_size) {
1836                 ext3_msg(sb, KERN_ERR,
1837                        "error: fragsize %lu != blocksize %u (unsupported)",
1838                        sbi->s_frag_size, blocksize);
1839                 goto failed_mount;
1840         }
1841         sbi->s_frags_per_block = 1;
1842         sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1843         sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1844         sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1845         if (EXT3_INODE_SIZE(sb) == 0 || EXT3_INODES_PER_GROUP(sb) == 0)
1846                 goto cantfind_ext3;
1847         sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1848         if (sbi->s_inodes_per_block == 0)
1849                 goto cantfind_ext3;
1850         sbi->s_itb_per_group = sbi->s_inodes_per_group /
1851                                         sbi->s_inodes_per_block;
1852         sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1853         sbi->s_sbh = bh;
1854         sbi->s_mount_state = le16_to_cpu(es->s_state);
1855         sbi->s_addr_per_block_bits = ilog2(EXT3_ADDR_PER_BLOCK(sb));
1856         sbi->s_desc_per_block_bits = ilog2(EXT3_DESC_PER_BLOCK(sb));
1857         for (i=0; i < 4; i++)
1858                 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1859         sbi->s_def_hash_version = es->s_def_hash_version;
1860         i = le32_to_cpu(es->s_flags);
1861         if (i & EXT2_FLAGS_UNSIGNED_HASH)
1862                 sbi->s_hash_unsigned = 3;
1863         else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
1864 #ifdef __CHAR_UNSIGNED__
1865                 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
1866                 sbi->s_hash_unsigned = 3;
1867 #else
1868                 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
1869 #endif
1870         }
1871
1872         if (sbi->s_blocks_per_group > blocksize * 8) {
1873                 ext3_msg(sb, KERN_ERR,
1874                         "#blocks per group too big: %lu",
1875                         sbi->s_blocks_per_group);
1876                 goto failed_mount;
1877         }
1878         if (sbi->s_frags_per_group > blocksize * 8) {
1879                 ext3_msg(sb, KERN_ERR,
1880                         "error: #fragments per group too big: %lu",
1881                         sbi->s_frags_per_group);
1882                 goto failed_mount;
1883         }
1884         if (sbi->s_inodes_per_group > blocksize * 8) {
1885                 ext3_msg(sb, KERN_ERR,
1886                         "error: #inodes per group too big: %lu",
1887                         sbi->s_inodes_per_group);
1888                 goto failed_mount;
1889         }
1890
1891         err = generic_check_addressable(sb->s_blocksize_bits,
1892                                         le32_to_cpu(es->s_blocks_count));
1893         if (err) {
1894                 ext3_msg(sb, KERN_ERR,
1895                         "error: filesystem is too large to mount safely");
1896                 if (sizeof(sector_t) < 8)
1897                         ext3_msg(sb, KERN_ERR,
1898                                 "error: CONFIG_LBDAF not enabled");
1899                 ret = err;
1900                 goto failed_mount;
1901         }
1902
1903         if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1904                 goto cantfind_ext3;
1905         sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1906                                le32_to_cpu(es->s_first_data_block) - 1)
1907                                        / EXT3_BLOCKS_PER_GROUP(sb)) + 1;
1908         db_count = DIV_ROUND_UP(sbi->s_groups_count, EXT3_DESC_PER_BLOCK(sb));
1909         sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1910                                     GFP_KERNEL);
1911         if (sbi->s_group_desc == NULL) {
1912                 ext3_msg(sb, KERN_ERR,
1913                         "error: not enough memory");
1914                 ret = -ENOMEM;
1915                 goto failed_mount;
1916         }
1917
1918         bgl_lock_init(sbi->s_blockgroup_lock);
1919
1920         for (i = 0; i < db_count; i++) {
1921                 block = descriptor_loc(sb, logic_sb_block, i);
1922                 sbi->s_group_desc[i] = sb_bread(sb, block);
1923                 if (!sbi->s_group_desc[i]) {
1924                         ext3_msg(sb, KERN_ERR,
1925                                 "error: can't read group descriptor %d", i);
1926                         db_count = i;
1927                         goto failed_mount2;
1928                 }
1929         }
1930         if (!ext3_check_descriptors (sb)) {
1931                 ext3_msg(sb, KERN_ERR,
1932                         "error: group descriptors corrupted");
1933                 goto failed_mount2;
1934         }
1935         sbi->s_gdb_count = db_count;
1936         get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1937         spin_lock_init(&sbi->s_next_gen_lock);
1938
1939         /* per fileystem reservation list head & lock */
1940         spin_lock_init(&sbi->s_rsv_window_lock);
1941         sbi->s_rsv_window_root = RB_ROOT;
1942         /* Add a single, static dummy reservation to the start of the
1943          * reservation window list --- it gives us a placeholder for
1944          * append-at-start-of-list which makes the allocation logic
1945          * _much_ simpler. */
1946         sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1947         sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1948         sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1949         sbi->s_rsv_window_head.rsv_goal_size = 0;
1950         ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1951
1952         /*
1953          * set up enough so that it can read an inode
1954          */
1955         sb->s_op = &ext3_sops;
1956         sb->s_export_op = &ext3_export_ops;
1957         sb->s_xattr = ext3_xattr_handlers;
1958 #ifdef CONFIG_QUOTA
1959         sb->s_qcop = &ext3_qctl_operations;
1960         sb->dq_op = &ext3_quota_operations;
1961 #endif
1962         memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
1963         INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1964         mutex_init(&sbi->s_orphan_lock);
1965         mutex_init(&sbi->s_resize_lock);
1966
1967         sb->s_root = NULL;
1968
1969         needs_recovery = (es->s_last_orphan != 0 ||
1970                           EXT3_HAS_INCOMPAT_FEATURE(sb,
1971                                     EXT3_FEATURE_INCOMPAT_RECOVER));
1972
1973         /*
1974          * The first inode we look at is the journal inode.  Don't try
1975          * root first: it may be modified in the journal!
1976          */
1977         if (!test_opt(sb, NOLOAD) &&
1978             EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
1979                 if (ext3_load_journal(sb, es, journal_devnum))
1980                         goto failed_mount2;
1981         } else if (journal_inum) {
1982                 if (ext3_create_journal(sb, es, journal_inum))
1983                         goto failed_mount2;
1984         } else {
1985                 if (!silent)
1986                         ext3_msg(sb, KERN_ERR,
1987                                 "error: no journal found. "
1988                                 "mounting ext3 over ext2?");
1989                 goto failed_mount2;
1990         }
1991         err = percpu_counter_init(&sbi->s_freeblocks_counter,
1992                         ext3_count_free_blocks(sb));
1993         if (!err) {
1994                 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1995                                 ext3_count_free_inodes(sb));
1996         }
1997         if (!err) {
1998                 err = percpu_counter_init(&sbi->s_dirs_counter,
1999                                 ext3_count_dirs(sb));
2000         }
2001         if (err) {
2002                 ext3_msg(sb, KERN_ERR, "error: insufficient memory");
2003                 ret = err;
2004                 goto failed_mount3;
2005         }
2006
2007         /* We have now updated the journal if required, so we can
2008          * validate the data journaling mode. */
2009         switch (test_opt(sb, DATA_FLAGS)) {
2010         case 0:
2011                 /* No mode set, assume a default based on the journal
2012                    capabilities: ORDERED_DATA if the journal can
2013                    cope, else JOURNAL_DATA */
2014                 if (journal_check_available_features
2015                     (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
2016                         set_opt(sbi->s_mount_opt, DEFAULT_DATA_MODE);
2017                 else
2018                         set_opt(sbi->s_mount_opt, JOURNAL_DATA);
2019                 break;
2020
2021         case EXT3_MOUNT_ORDERED_DATA:
2022         case EXT3_MOUNT_WRITEBACK_DATA:
2023                 if (!journal_check_available_features
2024                     (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
2025                         ext3_msg(sb, KERN_ERR,
2026                                 "error: journal does not support "
2027                                 "requested data journaling mode");
2028                         goto failed_mount3;
2029                 }
2030         default:
2031                 break;
2032         }
2033
2034         /*
2035          * The journal_load will have done any necessary log recovery,
2036          * so we can safely mount the rest of the filesystem now.
2037          */
2038
2039         root = ext3_iget(sb, EXT3_ROOT_INO);
2040         if (IS_ERR(root)) {
2041                 ext3_msg(sb, KERN_ERR, "error: get root inode failed");
2042                 ret = PTR_ERR(root);
2043                 goto failed_mount3;
2044         }
2045         if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
2046                 iput(root);
2047                 ext3_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck");
2048                 goto failed_mount3;
2049         }
2050         sb->s_root = d_make_root(root);
2051         if (!sb->s_root) {
2052                 ext3_msg(sb, KERN_ERR, "error: get root dentry failed");
2053                 ret = -ENOMEM;
2054                 goto failed_mount3;
2055         }
2056
2057         if (ext3_setup_super(sb, es, sb->s_flags & MS_RDONLY))
2058                 sb->s_flags |= MS_RDONLY;
2059
2060         EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
2061         ext3_orphan_cleanup(sb, es);
2062         EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
2063         if (needs_recovery) {
2064                 ext3_mark_recovery_complete(sb, es);
2065                 ext3_msg(sb, KERN_INFO, "recovery complete");
2066         }
2067         ext3_msg(sb, KERN_INFO, "mounted filesystem with %s data mode",
2068                 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
2069                 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
2070                 "writeback");
2071
2072         return 0;
2073
2074 cantfind_ext3:
2075         if (!silent)
2076                 ext3_msg(sb, KERN_INFO,
2077                         "error: can't find ext3 filesystem on dev %s.",
2078                        sb->s_id);
2079         goto failed_mount;
2080
2081 failed_mount3:
2082         percpu_counter_destroy(&sbi->s_freeblocks_counter);
2083         percpu_counter_destroy(&sbi->s_freeinodes_counter);
2084         percpu_counter_destroy(&sbi->s_dirs_counter);
2085         journal_destroy(sbi->s_journal);
2086 failed_mount2:
2087         for (i = 0; i < db_count; i++)
2088                 brelse(sbi->s_group_desc[i]);
2089         kfree(sbi->s_group_desc);
2090 failed_mount:
2091 #ifdef CONFIG_QUOTA
2092         for (i = 0; i < MAXQUOTAS; i++)
2093                 kfree(sbi->s_qf_names[i]);
2094 #endif
2095         ext3_blkdev_remove(sbi);
2096         brelse(bh);
2097 out_fail:
2098         sb->s_fs_info = NULL;
2099         kfree(sbi->s_blockgroup_lock);
2100         kfree(sbi);
2101         return ret;
2102 }
2103
2104 /*
2105  * Setup any per-fs journal parameters now.  We'll do this both on
2106  * initial mount, once the journal has been initialised but before we've
2107  * done any recovery; and again on any subsequent remount.
2108  */
2109 static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
2110 {
2111         struct ext3_sb_info *sbi = EXT3_SB(sb);
2112
2113         if (sbi->s_commit_interval)
2114                 journal->j_commit_interval = sbi->s_commit_interval;
2115         /* We could also set up an ext3-specific default for the commit
2116          * interval here, but for now we'll just fall back to the jbd
2117          * default. */
2118
2119         spin_lock(&journal->j_state_lock);
2120         if (test_opt(sb, BARRIER))
2121                 journal->j_flags |= JFS_BARRIER;
2122         else
2123                 journal->j_flags &= ~JFS_BARRIER;
2124         if (test_opt(sb, DATA_ERR_ABORT))
2125                 journal->j_flags |= JFS_ABORT_ON_SYNCDATA_ERR;
2126         else
2127                 journal->j_flags &= ~JFS_ABORT_ON_SYNCDATA_ERR;
2128         spin_unlock(&journal->j_state_lock);
2129 }
2130
2131 static journal_t *ext3_get_journal(struct super_block *sb,
2132                                    unsigned int journal_inum)
2133 {
2134         struct inode *journal_inode;
2135         journal_t *journal;
2136
2137         /* First, test for the existence of a valid inode on disk.  Bad
2138          * things happen if we iget() an unused inode, as the subsequent
2139          * iput() will try to delete it. */
2140
2141         journal_inode = ext3_iget(sb, journal_inum);
2142         if (IS_ERR(journal_inode)) {
2143                 ext3_msg(sb, KERN_ERR, "error: no journal found");
2144                 return NULL;
2145         }
2146         if (!journal_inode->i_nlink) {
2147                 make_bad_inode(journal_inode);
2148                 iput(journal_inode);
2149                 ext3_msg(sb, KERN_ERR, "error: journal inode is deleted");
2150                 return NULL;
2151         }
2152
2153         jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2154                   journal_inode, journal_inode->i_size);
2155         if (!S_ISREG(journal_inode->i_mode)) {
2156                 ext3_msg(sb, KERN_ERR, "error: invalid journal inode");
2157                 iput(journal_inode);
2158                 return NULL;
2159         }
2160
2161         journal = journal_init_inode(journal_inode);
2162         if (!journal) {
2163                 ext3_msg(sb, KERN_ERR, "error: could not load journal inode");
2164                 iput(journal_inode);
2165                 return NULL;
2166         }
2167         journal->j_private = sb;
2168         ext3_init_journal_params(sb, journal);
2169         return journal;
2170 }
2171
2172 static journal_t *ext3_get_dev_journal(struct super_block *sb,
2173                                        dev_t j_dev)
2174 {
2175         struct buffer_head * bh;
2176         journal_t *journal;
2177         ext3_fsblk_t start;
2178         ext3_fsblk_t len;
2179         int hblock, blocksize;
2180         ext3_fsblk_t sb_block;
2181         unsigned long offset;
2182         struct ext3_super_block * es;
2183         struct block_device *bdev;
2184
2185         bdev = ext3_blkdev_get(j_dev, sb);
2186         if (bdev == NULL)
2187                 return NULL;
2188
2189         blocksize = sb->s_blocksize;
2190         hblock = bdev_logical_block_size(bdev);
2191         if (blocksize < hblock) {
2192                 ext3_msg(sb, KERN_ERR,
2193                         "error: blocksize too small for journal device");
2194                 goto out_bdev;
2195         }
2196
2197         sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
2198         offset = EXT3_MIN_BLOCK_SIZE % blocksize;
2199         set_blocksize(bdev, blocksize);
2200         if (!(bh = __bread(bdev, sb_block, blocksize))) {
2201                 ext3_msg(sb, KERN_ERR, "error: couldn't read superblock of "
2202                         "external journal");
2203                 goto out_bdev;
2204         }
2205
2206         es = (struct ext3_super_block *) (bh->b_data + offset);
2207         if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
2208             !(le32_to_cpu(es->s_feature_incompat) &
2209               EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2210                 ext3_msg(sb, KERN_ERR, "error: external journal has "
2211                         "bad superblock");
2212                 brelse(bh);
2213                 goto out_bdev;
2214         }
2215
2216         if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2217                 ext3_msg(sb, KERN_ERR, "error: journal UUID does not match");
2218                 brelse(bh);
2219                 goto out_bdev;
2220         }
2221
2222         len = le32_to_cpu(es->s_blocks_count);
2223         start = sb_block + 1;
2224         brelse(bh);     /* we're done with the superblock */
2225
2226         journal = journal_init_dev(bdev, sb->s_bdev,
2227                                         start, len, blocksize);
2228         if (!journal) {
2229                 ext3_msg(sb, KERN_ERR,
2230                         "error: failed to create device journal");
2231                 goto out_bdev;
2232         }
2233         journal->j_private = sb;
2234         if (!bh_uptodate_or_lock(journal->j_sb_buffer)) {
2235                 if (bh_submit_read(journal->j_sb_buffer)) {
2236                         ext3_msg(sb, KERN_ERR, "I/O error on journal device");
2237                         goto out_journal;
2238                 }
2239         }
2240         if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
2241                 ext3_msg(sb, KERN_ERR,
2242                         "error: external journal has more than one "
2243                         "user (unsupported) - %d",
2244                         be32_to_cpu(journal->j_superblock->s_nr_users));
2245                 goto out_journal;
2246         }
2247         EXT3_SB(sb)->journal_bdev = bdev;
2248         ext3_init_journal_params(sb, journal);
2249         return journal;
2250 out_journal:
2251         journal_destroy(journal);
2252 out_bdev:
2253         ext3_blkdev_put(bdev);
2254         return NULL;
2255 }
2256
2257 static int ext3_load_journal(struct super_block *sb,
2258                              struct ext3_super_block *es,
2259                              unsigned long journal_devnum)
2260 {
2261         journal_t *journal;
2262         unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2263         dev_t journal_dev;
2264         int err = 0;
2265         int really_read_only;
2266
2267         if (journal_devnum &&
2268             journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2269                 ext3_msg(sb, KERN_INFO, "external journal device major/minor "
2270                         "numbers have changed");
2271                 journal_dev = new_decode_dev(journal_devnum);
2272         } else
2273                 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2274
2275         really_read_only = bdev_read_only(sb->s_bdev);
2276
2277         /*
2278          * Are we loading a blank journal or performing recovery after a
2279          * crash?  For recovery, we need to check in advance whether we
2280          * can get read-write access to the device.
2281          */
2282
2283         if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
2284                 if (sb->s_flags & MS_RDONLY) {
2285                         ext3_msg(sb, KERN_INFO,
2286                                 "recovery required on readonly filesystem");
2287                         if (really_read_only) {
2288                                 ext3_msg(sb, KERN_ERR, "error: write access "
2289                                         "unavailable, cannot proceed");
2290                                 return -EROFS;
2291                         }
2292                         ext3_msg(sb, KERN_INFO,
2293                                 "write access will be enabled during recovery");
2294                 }
2295         }
2296
2297         if (journal_inum && journal_dev) {
2298                 ext3_msg(sb, KERN_ERR, "error: filesystem has both journal "
2299                        "and inode journals");
2300                 return -EINVAL;
2301         }
2302
2303         if (journal_inum) {
2304                 if (!(journal = ext3_get_journal(sb, journal_inum)))
2305                         return -EINVAL;
2306         } else {
2307                 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
2308                         return -EINVAL;
2309         }
2310
2311         if (!(journal->j_flags & JFS_BARRIER))
2312                 printk(KERN_INFO "EXT3-fs: barriers not enabled\n");
2313
2314         if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2315                 err = journal_update_format(journal);
2316                 if (err)  {
2317                         ext3_msg(sb, KERN_ERR, "error updating journal");
2318                         journal_destroy(journal);
2319                         return err;
2320                 }
2321         }
2322
2323         if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
2324                 err = journal_wipe(journal, !really_read_only);
2325         if (!err)
2326                 err = journal_load(journal);
2327
2328         if (err) {
2329                 ext3_msg(sb, KERN_ERR, "error loading journal");
2330                 journal_destroy(journal);
2331                 return err;
2332         }
2333
2334         EXT3_SB(sb)->s_journal = journal;
2335         ext3_clear_journal_err(sb, es);
2336
2337         if (!really_read_only && journal_devnum &&
2338             journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2339                 es->s_journal_dev = cpu_to_le32(journal_devnum);
2340
2341                 /* Make sure we flush the recovery flag to disk. */
2342                 ext3_commit_super(sb, es, 1);
2343         }
2344
2345         return 0;
2346 }
2347
2348 static int ext3_create_journal(struct super_block *sb,
2349                                struct ext3_super_block *es,
2350                                unsigned int journal_inum)
2351 {
2352         journal_t *journal;
2353         int err;
2354
2355         if (sb->s_flags & MS_RDONLY) {
2356                 ext3_msg(sb, KERN_ERR,
2357                         "error: readonly filesystem when trying to "
2358                         "create journal");
2359                 return -EROFS;
2360         }
2361
2362         journal = ext3_get_journal(sb, journal_inum);
2363         if (!journal)
2364                 return -EINVAL;
2365
2366         ext3_msg(sb, KERN_INFO, "creating new journal on inode %u",
2367                journal_inum);
2368
2369         err = journal_create(journal);
2370         if (err) {
2371                 ext3_msg(sb, KERN_ERR, "error creating journal");
2372                 journal_destroy(journal);
2373                 return -EIO;
2374         }
2375
2376         EXT3_SB(sb)->s_journal = journal;
2377
2378         ext3_update_dynamic_rev(sb);
2379         EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2380         EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2381
2382         es->s_journal_inum = cpu_to_le32(journal_inum);
2383
2384         /* Make sure we flush the recovery flag to disk. */
2385         ext3_commit_super(sb, es, 1);
2386
2387         return 0;
2388 }
2389
2390 static int ext3_commit_super(struct super_block *sb,
2391                                struct ext3_super_block *es,
2392                                int sync)
2393 {
2394         struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
2395         int error = 0;
2396
2397         if (!sbh)
2398                 return error;
2399
2400         if (buffer_write_io_error(sbh)) {
2401                 /*
2402                  * Oh, dear.  A previous attempt to write the
2403                  * superblock failed.  This could happen because the
2404                  * USB device was yanked out.  Or it could happen to
2405                  * be a transient write error and maybe the block will
2406                  * be remapped.  Nothing we can do but to retry the
2407                  * write and hope for the best.
2408                  */
2409                 ext3_msg(sb, KERN_ERR, "previous I/O error to "
2410                        "superblock detected");
2411                 clear_buffer_write_io_error(sbh);
2412                 set_buffer_uptodate(sbh);
2413         }
2414         /*
2415          * If the file system is mounted read-only, don't update the
2416          * superblock write time.  This avoids updating the superblock
2417          * write time when we are mounting the root file system
2418          * read/only but we need to replay the journal; at that point,
2419          * for people who are east of GMT and who make their clock
2420          * tick in localtime for Windows bug-for-bug compatibility,
2421          * the clock is set in the future, and this will cause e2fsck
2422          * to complain and force a full file system check.
2423          */
2424         if (!(sb->s_flags & MS_RDONLY))
2425                 es->s_wtime = cpu_to_le32(get_seconds());
2426         es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2427         es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2428         BUFFER_TRACE(sbh, "marking dirty");
2429         mark_buffer_dirty(sbh);
2430         if (sync) {
2431                 error = sync_dirty_buffer(sbh);
2432                 if (buffer_write_io_error(sbh)) {
2433                         ext3_msg(sb, KERN_ERR, "I/O error while writing "
2434                                "superblock");
2435                         clear_buffer_write_io_error(sbh);
2436                         set_buffer_uptodate(sbh);
2437                 }
2438         }
2439         return error;
2440 }
2441
2442
2443 /*
2444  * Have we just finished recovery?  If so, and if we are mounting (or
2445  * remounting) the filesystem readonly, then we will end up with a
2446  * consistent fs on disk.  Record that fact.
2447  */
2448 static void ext3_mark_recovery_complete(struct super_block * sb,
2449                                         struct ext3_super_block * es)
2450 {
2451         journal_t *journal = EXT3_SB(sb)->s_journal;
2452
2453         journal_lock_updates(journal);
2454         if (journal_flush(journal) < 0)
2455                 goto out;
2456
2457         if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2458             sb->s_flags & MS_RDONLY) {
2459                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2460                 ext3_commit_super(sb, es, 1);
2461         }
2462
2463 out:
2464         journal_unlock_updates(journal);
2465 }
2466
2467 /*
2468  * If we are mounting (or read-write remounting) a filesystem whose journal
2469  * has recorded an error from a previous lifetime, move that error to the
2470  * main filesystem now.
2471  */
2472 static void ext3_clear_journal_err(struct super_block *sb,
2473                                    struct ext3_super_block *es)
2474 {
2475         journal_t *journal;
2476         int j_errno;
2477         const char *errstr;
2478
2479         journal = EXT3_SB(sb)->s_journal;
2480
2481         /*
2482          * Now check for any error status which may have been recorded in the
2483          * journal by a prior ext3_error() or ext3_abort()
2484          */
2485
2486         j_errno = journal_errno(journal);
2487         if (j_errno) {
2488                 char nbuf[16];
2489
2490                 errstr = ext3_decode_error(sb, j_errno, nbuf);
2491                 ext3_warning(sb, __func__, "Filesystem error recorded "
2492                              "from previous mount: %s", errstr);
2493                 ext3_warning(sb, __func__, "Marking fs in need of "
2494                              "filesystem check.");
2495
2496                 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2497                 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2498                 ext3_commit_super (sb, es, 1);
2499
2500                 journal_clear_err(journal);
2501         }
2502 }
2503
2504 /*
2505  * Force the running and committing transactions to commit,
2506  * and wait on the commit.
2507  */
2508 int ext3_force_commit(struct super_block *sb)
2509 {
2510         journal_t *journal;
2511         int ret;
2512
2513         if (sb->s_flags & MS_RDONLY)
2514                 return 0;
2515
2516         journal = EXT3_SB(sb)->s_journal;
2517         ret = ext3_journal_force_commit(journal);
2518         return ret;
2519 }
2520
2521 static int ext3_sync_fs(struct super_block *sb, int wait)
2522 {
2523         tid_t target;
2524
2525         trace_ext3_sync_fs(sb, wait);
2526         /*
2527          * Writeback quota in non-journalled quota case - journalled quota has
2528          * no dirty dquots
2529          */
2530         dquot_writeback_dquots(sb, -1);
2531         if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2532                 if (wait)
2533                         log_wait_commit(EXT3_SB(sb)->s_journal, target);
2534         }
2535         return 0;
2536 }
2537
2538 /*
2539  * LVM calls this function before a (read-only) snapshot is created.  This
2540  * gives us a chance to flush the journal completely and mark the fs clean.
2541  */
2542 static int ext3_freeze(struct super_block *sb)
2543 {
2544         int error = 0;
2545         journal_t *journal;
2546
2547         if (!(sb->s_flags & MS_RDONLY)) {
2548                 journal = EXT3_SB(sb)->s_journal;
2549
2550                 /* Now we set up the journal barrier. */
2551                 journal_lock_updates(journal);
2552
2553                 /*
2554                  * We don't want to clear needs_recovery flag when we failed
2555                  * to flush the journal.
2556                  */
2557                 error = journal_flush(journal);
2558                 if (error < 0)
2559                         goto out;
2560
2561                 /* Journal blocked and flushed, clear needs_recovery flag. */
2562                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2563                 error = ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2564                 if (error)
2565                         goto out;
2566         }
2567         return 0;
2568
2569 out:
2570         journal_unlock_updates(journal);
2571         return error;
2572 }
2573
2574 /*
2575  * Called by LVM after the snapshot is done.  We need to reset the RECOVER
2576  * flag here, even though the filesystem is not technically dirty yet.
2577  */
2578 static int ext3_unfreeze(struct super_block *sb)
2579 {
2580         if (!(sb->s_flags & MS_RDONLY)) {
2581                 /* Reser the needs_recovery flag before the fs is unlocked. */
2582                 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2583                 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2584                 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2585         }
2586         return 0;
2587 }
2588
2589 static int ext3_remount (struct super_block * sb, int * flags, char * data)
2590 {
2591         struct ext3_super_block * es;
2592         struct ext3_sb_info *sbi = EXT3_SB(sb);
2593         ext3_fsblk_t n_blocks_count = 0;
2594         unsigned long old_sb_flags;
2595         struct ext3_mount_options old_opts;
2596         int enable_quota = 0;
2597         int err;
2598 #ifdef CONFIG_QUOTA
2599         int i;
2600 #endif
2601
2602         /* Store the original options */
2603         old_sb_flags = sb->s_flags;
2604         old_opts.s_mount_opt = sbi->s_mount_opt;
2605         old_opts.s_resuid = sbi->s_resuid;
2606         old_opts.s_resgid = sbi->s_resgid;
2607         old_opts.s_commit_interval = sbi->s_commit_interval;
2608 #ifdef CONFIG_QUOTA
2609         old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2610         for (i = 0; i < MAXQUOTAS; i++)
2611                 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2612 #endif
2613
2614         /*
2615          * Allow the "check" option to be passed as a remount option.
2616          */
2617         if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2618                 err = -EINVAL;
2619                 goto restore_opts;
2620         }
2621
2622         if (test_opt(sb, ABORT))
2623                 ext3_abort(sb, __func__, "Abort forced by user");
2624
2625         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2626                 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
2627
2628         es = sbi->s_es;
2629
2630         ext3_init_journal_params(sb, sbi->s_journal);
2631
2632         if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2633                 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
2634                 if (test_opt(sb, ABORT)) {
2635                         err = -EROFS;
2636                         goto restore_opts;
2637                 }
2638
2639                 if (*flags & MS_RDONLY) {
2640                         err = dquot_suspend(sb, -1);
2641                         if (err < 0)
2642                                 goto restore_opts;
2643
2644                         /*
2645                          * First of all, the unconditional stuff we have to do
2646                          * to disable replay of the journal when we next remount
2647                          */
2648                         sb->s_flags |= MS_RDONLY;
2649
2650                         /*
2651                          * OK, test if we are remounting a valid rw partition
2652                          * readonly, and if so set the rdonly flag and then
2653                          * mark the partition as valid again.
2654                          */
2655                         if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2656                             (sbi->s_mount_state & EXT3_VALID_FS))
2657                                 es->s_state = cpu_to_le16(sbi->s_mount_state);
2658
2659                         ext3_mark_recovery_complete(sb, es);
2660                 } else {
2661                         __le32 ret;
2662                         if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2663                                         ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2664                                 ext3_msg(sb, KERN_WARNING,
2665                                         "warning: couldn't remount RDWR "
2666                                         "because of unsupported optional "
2667                                         "features (%x)", le32_to_cpu(ret));
2668                                 err = -EROFS;
2669                                 goto restore_opts;
2670                         }
2671
2672                         /*
2673                          * If we have an unprocessed orphan list hanging
2674                          * around from a previously readonly bdev mount,
2675                          * require a full umount & mount for now.
2676                          */
2677                         if (es->s_last_orphan) {
2678                                 ext3_msg(sb, KERN_WARNING, "warning: couldn't "
2679                                        "remount RDWR because of unprocessed "
2680                                        "orphan inode list.  Please "
2681                                        "umount & mount instead.");
2682                                 err = -EINVAL;
2683                                 goto restore_opts;
2684                         }
2685
2686                         /*
2687                          * Mounting a RDONLY partition read-write, so reread
2688                          * and store the current valid flag.  (It may have
2689                          * been changed by e2fsck since we originally mounted
2690                          * the partition.)
2691                          */
2692                         ext3_clear_journal_err(sb, es);
2693                         sbi->s_mount_state = le16_to_cpu(es->s_state);
2694                         if ((err = ext3_group_extend(sb, es, n_blocks_count)))
2695                                 goto restore_opts;
2696                         if (!ext3_setup_super (sb, es, 0))
2697                                 sb->s_flags &= ~MS_RDONLY;
2698                         enable_quota = 1;
2699                 }
2700         }
2701 #ifdef CONFIG_QUOTA
2702         /* Release old quota file names */
2703         for (i = 0; i < MAXQUOTAS; i++)
2704                 if (old_opts.s_qf_names[i] &&
2705                     old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2706                         kfree(old_opts.s_qf_names[i]);
2707 #endif
2708         if (enable_quota)
2709                 dquot_resume(sb, -1);
2710         return 0;
2711 restore_opts:
2712         sb->s_flags = old_sb_flags;
2713         sbi->s_mount_opt = old_opts.s_mount_opt;
2714         sbi->s_resuid = old_opts.s_resuid;
2715         sbi->s_resgid = old_opts.s_resgid;
2716         sbi->s_commit_interval = old_opts.s_commit_interval;
2717 #ifdef CONFIG_QUOTA
2718         sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2719         for (i = 0; i < MAXQUOTAS; i++) {
2720                 if (sbi->s_qf_names[i] &&
2721                     old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2722                         kfree(sbi->s_qf_names[i]);
2723                 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2724         }
2725 #endif
2726         return err;
2727 }
2728
2729 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
2730 {
2731         struct super_block *sb = dentry->d_sb;
2732         struct ext3_sb_info *sbi = EXT3_SB(sb);
2733         struct ext3_super_block *es = sbi->s_es;
2734         u64 fsid;
2735
2736         if (test_opt(sb, MINIX_DF)) {
2737                 sbi->s_overhead_last = 0;
2738         } else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
2739                 unsigned long ngroups = sbi->s_groups_count, i;
2740                 ext3_fsblk_t overhead = 0;
2741                 smp_rmb();
2742
2743                 /*
2744                  * Compute the overhead (FS structures).  This is constant
2745                  * for a given filesystem unless the number of block groups
2746                  * changes so we cache the previous value until it does.
2747                  */
2748
2749                 /*
2750                  * All of the blocks before first_data_block are
2751                  * overhead
2752                  */
2753                 overhead = le32_to_cpu(es->s_first_data_block);
2754
2755                 /*
2756                  * Add the overhead attributed to the superblock and
2757                  * block group descriptors.  If the sparse superblocks
2758                  * feature is turned on, then not all groups have this.
2759                  */
2760                 for (i = 0; i < ngroups; i++) {
2761                         overhead += ext3_bg_has_super(sb, i) +
2762                                 ext3_bg_num_gdb(sb, i);
2763                         cond_resched();
2764                 }
2765
2766                 /*
2767                  * Every block group has an inode bitmap, a block
2768                  * bitmap, and an inode table.
2769                  */
2770                 overhead += ngroups * (2 + sbi->s_itb_per_group);
2771                 sbi->s_overhead_last = overhead;
2772                 smp_wmb();
2773                 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
2774         }
2775
2776         buf->f_type = EXT3_SUPER_MAGIC;
2777         buf->f_bsize = sb->s_blocksize;
2778         buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
2779         buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
2780         buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2781         if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2782                 buf->f_bavail = 0;
2783         buf->f_files = le32_to_cpu(es->s_inodes_count);
2784         buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
2785         buf->f_namelen = EXT3_NAME_LEN;
2786         fsid = le64_to_cpup((void *)es->s_uuid) ^
2787                le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2788         buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2789         buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
2790         return 0;
2791 }
2792
2793 /* Helper function for writing quotas on sync - we need to start transaction before quota file
2794  * is locked for write. Otherwise the are possible deadlocks:
2795  * Process 1                         Process 2
2796  * ext3_create()                     quota_sync()
2797  *   journal_start()                   write_dquot()
2798  *   dquot_initialize()                       down(dqio_mutex)
2799  *     down(dqio_mutex)                    journal_start()
2800  *
2801  */
2802
2803 #ifdef CONFIG_QUOTA
2804
2805 static inline struct inode *dquot_to_inode(struct dquot *dquot)
2806 {
2807         return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
2808 }
2809
2810 static int ext3_write_dquot(struct dquot *dquot)
2811 {
2812         int ret, err;
2813         handle_t *handle;
2814         struct inode *inode;
2815
2816         inode = dquot_to_inode(dquot);
2817         handle = ext3_journal_start(inode,
2818                                         EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2819         if (IS_ERR(handle))
2820                 return PTR_ERR(handle);
2821         ret = dquot_commit(dquot);
2822         err = ext3_journal_stop(handle);
2823         if (!ret)
2824                 ret = err;
2825         return ret;
2826 }
2827
2828 static int ext3_acquire_dquot(struct dquot *dquot)
2829 {
2830         int ret, err;
2831         handle_t *handle;
2832
2833         handle = ext3_journal_start(dquot_to_inode(dquot),
2834                                         EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2835         if (IS_ERR(handle))
2836                 return PTR_ERR(handle);
2837         ret = dquot_acquire(dquot);
2838         err = ext3_journal_stop(handle);
2839         if (!ret)
2840                 ret = err;
2841         return ret;
2842 }
2843
2844 static int ext3_release_dquot(struct dquot *dquot)
2845 {
2846         int ret, err;
2847         handle_t *handle;
2848
2849         handle = ext3_journal_start(dquot_to_inode(dquot),
2850                                         EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2851         if (IS_ERR(handle)) {
2852                 /* Release dquot anyway to avoid endless cycle in dqput() */
2853                 dquot_release(dquot);
2854                 return PTR_ERR(handle);
2855         }
2856         ret = dquot_release(dquot);
2857         err = ext3_journal_stop(handle);
2858         if (!ret)
2859                 ret = err;
2860         return ret;
2861 }
2862
2863 static int ext3_mark_dquot_dirty(struct dquot *dquot)
2864 {
2865         /* Are we journaling quotas? */
2866         if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2867             EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2868                 dquot_mark_dquot_dirty(dquot);
2869                 return ext3_write_dquot(dquot);
2870         } else {
2871                 return dquot_mark_dquot_dirty(dquot);
2872         }
2873 }
2874
2875 static int ext3_write_info(struct super_block *sb, int type)
2876 {
2877         int ret, err;
2878         handle_t *handle;
2879
2880         /* Data block + inode block */
2881         handle = ext3_journal_start(sb->s_root->d_inode, 2);
2882         if (IS_ERR(handle))
2883                 return PTR_ERR(handle);
2884         ret = dquot_commit_info(sb, type);
2885         err = ext3_journal_stop(handle);
2886         if (!ret)
2887                 ret = err;
2888         return ret;
2889 }
2890
2891 /*
2892  * Turn on quotas during mount time - we need to find
2893  * the quota file and such...
2894  */
2895 static int ext3_quota_on_mount(struct super_block *sb, int type)
2896 {
2897         return dquot_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2898                                         EXT3_SB(sb)->s_jquota_fmt, type);
2899 }
2900
2901 /*
2902  * Standard function to be called on quota_on
2903  */
2904 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
2905                          struct path *path)
2906 {
2907         int err;
2908
2909         if (!test_opt(sb, QUOTA))
2910                 return -EINVAL;
2911
2912         /* Quotafile not on the same filesystem? */
2913         if (path->dentry->d_sb != sb)
2914                 return -EXDEV;
2915         /* Journaling quota? */
2916         if (EXT3_SB(sb)->s_qf_names[type]) {
2917                 /* Quotafile not of fs root? */
2918                 if (path->dentry->d_parent != sb->s_root)
2919                         ext3_msg(sb, KERN_WARNING,
2920                                 "warning: Quota file not on filesystem root. "
2921                                 "Journaled quota will not work.");
2922         }
2923
2924         /*
2925          * When we journal data on quota file, we have to flush journal to see
2926          * all updates to the file when we bypass pagecache...
2927          */
2928         if (ext3_should_journal_data(path->dentry->d_inode)) {
2929                 /*
2930                  * We don't need to lock updates but journal_flush() could
2931                  * otherwise be livelocked...
2932                  */
2933                 journal_lock_updates(EXT3_SB(sb)->s_journal);
2934                 err = journal_flush(EXT3_SB(sb)->s_journal);
2935                 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2936                 if (err)
2937                         return err;
2938         }
2939
2940         return dquot_quota_on(sb, type, format_id, path);
2941 }
2942
2943 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2944  * acquiring the locks... As quota files are never truncated and quota code
2945  * itself serializes the operations (and no one else should touch the files)
2946  * we don't have to be afraid of races */
2947 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2948                                size_t len, loff_t off)
2949 {
2950         struct inode *inode = sb_dqopt(sb)->files[type];
2951         sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2952         int err = 0;
2953         int offset = off & (sb->s_blocksize - 1);
2954         int tocopy;
2955         size_t toread;
2956         struct buffer_head *bh;
2957         loff_t i_size = i_size_read(inode);
2958
2959         if (off > i_size)
2960                 return 0;
2961         if (off+len > i_size)
2962                 len = i_size-off;
2963         toread = len;
2964         while (toread > 0) {
2965                 tocopy = sb->s_blocksize - offset < toread ?
2966                                 sb->s_blocksize - offset : toread;
2967                 bh = ext3_bread(NULL, inode, blk, 0, &err);
2968                 if (err)
2969                         return err;
2970                 if (!bh)        /* A hole? */
2971                         memset(data, 0, tocopy);
2972                 else
2973                         memcpy(data, bh->b_data+offset, tocopy);
2974                 brelse(bh);
2975                 offset = 0;
2976                 toread -= tocopy;
2977                 data += tocopy;
2978                 blk++;
2979         }
2980         return len;
2981 }
2982
2983 /* Write to quotafile (we know the transaction is already started and has
2984  * enough credits) */
2985 static ssize_t ext3_quota_write(struct super_block *sb, int type,
2986                                 const char *data, size_t len, loff_t off)
2987 {
2988         struct inode *inode = sb_dqopt(sb)->files[type];
2989         sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2990         int err = 0;
2991         int offset = off & (sb->s_blocksize - 1);
2992         int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
2993         struct buffer_head *bh;
2994         handle_t *handle = journal_current_handle();
2995
2996         if (!handle) {
2997                 ext3_msg(sb, KERN_WARNING,
2998                         "warning: quota write (off=%llu, len=%llu)"
2999                         " cancelled because transaction is not started.",
3000                         (unsigned long long)off, (unsigned long long)len);
3001                 return -EIO;
3002         }
3003
3004         /*
3005          * Since we account only one data block in transaction credits,
3006          * then it is impossible to cross a block boundary.
3007          */
3008         if (sb->s_blocksize - offset < len) {
3009                 ext3_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
3010                         " cancelled because not block aligned",
3011                         (unsigned long long)off, (unsigned long long)len);
3012                 return -EIO;
3013         }
3014         bh = ext3_bread(handle, inode, blk, 1, &err);
3015         if (!bh)
3016                 goto out;
3017         if (journal_quota) {
3018                 err = ext3_journal_get_write_access(handle, bh);
3019                 if (err) {
3020                         brelse(bh);
3021                         goto out;
3022                 }
3023         }
3024         lock_buffer(bh);
3025         memcpy(bh->b_data+offset, data, len);
3026         flush_dcache_page(bh->b_page);
3027         unlock_buffer(bh);
3028         if (journal_quota)
3029                 err = ext3_journal_dirty_metadata(handle, bh);
3030         else {
3031                 /* Always do at least ordered writes for quotas */
3032                 err = ext3_journal_dirty_data(handle, bh);
3033                 mark_buffer_dirty(bh);
3034         }
3035         brelse(bh);
3036 out:
3037         if (err)
3038                 return err;
3039         if (inode->i_size < off + len) {
3040                 i_size_write(inode, off + len);
3041                 EXT3_I(inode)->i_disksize = inode->i_size;
3042         }
3043         inode->i_version++;
3044         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
3045         ext3_mark_inode_dirty(handle, inode);
3046         return len;
3047 }
3048
3049 #endif
3050
3051 static struct dentry *ext3_mount(struct file_system_type *fs_type,
3052         int flags, const char *dev_name, void *data)
3053 {
3054         return mount_bdev(fs_type, flags, dev_name, data, ext3_fill_super);
3055 }
3056
3057 static struct file_system_type ext3_fs_type = {
3058         .owner          = THIS_MODULE,
3059         .name           = "ext3",
3060         .mount          = ext3_mount,
3061         .kill_sb        = kill_block_super,
3062         .fs_flags       = FS_REQUIRES_DEV,
3063 };
3064
3065 static int __init init_ext3_fs(void)
3066 {
3067         int err = init_ext3_xattr();
3068         if (err)
3069                 return err;
3070         err = init_inodecache();
3071         if (err)
3072                 goto out1;
3073         err = register_filesystem(&ext3_fs_type);
3074         if (err)
3075                 goto out;
3076         return 0;
3077 out:
3078         destroy_inodecache();
3079 out1:
3080         exit_ext3_xattr();
3081         return err;
3082 }
3083
3084 static void __exit exit_ext3_fs(void)
3085 {
3086         unregister_filesystem(&ext3_fs_type);
3087         destroy_inodecache();
3088         exit_ext3_xattr();
3089 }
3090
3091 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
3092 MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
3093 MODULE_LICENSE("GPL");
3094 module_init(init_ext3_fs)
3095 module_exit(exit_ext3_fs)