fs/ext3/super.c

   1 /*
   2  *  linux/fs/ext3/super.c
   3  *
   4  * Copyright (C) 1992, 1993, 1994, 1995
   5  * Remy Card ([email protected])
   6  * Laboratoire MASI - Institut Blaise Pascal
   7  * Universite Pierre et Marie Curie (Paris VI)
   8  *
   9  *  from
  10  *
  11  *  linux/fs/minix/inode.c
  12  *
  13  *  Copyright (C) 1991, 1992  Linus Torvalds
  14  *
  15  *  Big-endian to little-endian byte-swapping/bitmaps by
  16  *        David S. Miller ([email protected]), 1995
  17  */
  18
  19 #include <linux/module.h>
  20 #include <linux/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 0;
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 0;
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_sb_block = sb_block;
1665
1666         blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1667         if (!blocksize) {
1668                 ext3_msg(sb, KERN_ERR, "error: unable to set blocksize");
1669                 goto out_fail;
1670         }
1671
1672         /*
1673          * The ext3 superblock will not be buffer aligned for other than 1kB
1674          * block sizes.  We need to calculate the offset from buffer start.
1675          */
1676         if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1677                 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1678                 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1679         } else {
1680                 logic_sb_block = sb_block;
1681         }
1682
1683         if (!(bh = sb_bread(sb, logic_sb_block))) {
1684                 ext3_msg(sb, KERN_ERR, "error: unable to read superblock");
1685                 goto out_fail;
1686         }
1687         /*
1688          * Note: s_es must be initialized as soon as possible because
1689          *       some ext3 macro-instructions depend on its value
1690          */
1691         es = (struct ext3_super_block *) (bh->b_data + offset);
1692         sbi->s_es = es;
1693         sb->s_magic = le16_to_cpu(es->s_magic);
1694         if (sb->s_magic != EXT3_SUPER_MAGIC)
1695                 goto cantfind_ext3;
1696
1697         /* Set defaults before we parse the mount options */
1698         def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1699         if (def_mount_opts & EXT3_DEFM_DEBUG)
1700                 set_opt(sbi->s_mount_opt, DEBUG);
1701         if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1702                 set_opt(sbi->s_mount_opt, GRPID);
1703         if (def_mount_opts & EXT3_DEFM_UID16)
1704                 set_opt(sbi->s_mount_opt, NO_UID32);
1705 #ifdef CONFIG_EXT3_FS_XATTR
1706         if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1707                 set_opt(sbi->s_mount_opt, XATTR_USER);
1708 #endif
1709 #ifdef CONFIG_EXT3_FS_POSIX_ACL
1710         if (def_mount_opts & EXT3_DEFM_ACL)
1711                 set_opt(sbi->s_mount_opt, POSIX_ACL);
1712 #endif
1713         if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1714                 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1715         else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1716                 set_opt(sbi->s_mount_opt, ORDERED_DATA);
1717         else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1718                 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
1719
1720         if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1721                 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1722         else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_CONTINUE)
1723                 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1724         else
1725                 set_opt(sbi->s_mount_opt, ERRORS_RO);
1726
1727         sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
1728         sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
1729
1730         /* enable barriers by default */
1731         set_opt(sbi->s_mount_opt, BARRIER);
1732         set_opt(sbi->s_mount_opt, RESERVATION);
1733
1734         if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1735                             NULL, 0))
1736                 goto failed_mount;
1737
1738         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1739                 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
1740
1741         if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1742             (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1743              EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1744              EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1745                 ext3_msg(sb, KERN_WARNING,
1746                         "warning: feature flags set on rev 0 fs, "
1747                         "running e2fsck is recommended");
1748         /*
1749          * Check feature flags regardless of the revision level, since we
1750          * previously didn't change the revision level when setting the flags,
1751          * so there is a chance incompat flags are set on a rev 0 filesystem.
1752          */
1753         features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1754         if (features) {
1755                 ext3_msg(sb, KERN_ERR,
1756                         "error: couldn't mount because of unsupported "
1757                         "optional features (%x)", le32_to_cpu(features));
1758                 goto failed_mount;
1759         }
1760         features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1761         if (!(sb->s_flags & MS_RDONLY) && features) {
1762                 ext3_msg(sb, KERN_ERR,
1763                         "error: couldn't mount RDWR because of unsupported "
1764                         "optional features (%x)", le32_to_cpu(features));
1765                 goto failed_mount;
1766         }
1767         blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1768
1769         if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1770             blocksize > EXT3_MAX_BLOCK_SIZE) {
1771                 ext3_msg(sb, KERN_ERR,
1772                         "error: couldn't mount because of unsupported "
1773                         "filesystem blocksize %d", blocksize);
1774                 goto failed_mount;
1775         }
1776
1777         hblock = bdev_logical_block_size(sb->s_bdev);
1778         if (sb->s_blocksize != blocksize) {
1779                 /*
1780                  * Make sure the blocksize for the filesystem is larger
1781                  * than the hardware sectorsize for the machine.
1782                  */
1783                 if (blocksize < hblock) {
1784                         ext3_msg(sb, KERN_ERR,
1785                                 "error: fsblocksize %d too small for "
1786                                 "hardware sectorsize %d", blocksize, hblock);
1787                         goto failed_mount;
1788                 }
1789
1790                 brelse (bh);
1791                 if (!sb_set_blocksize(sb, blocksize)) {
1792                         ext3_msg(sb, KERN_ERR,
1793                                 "error: bad blocksize %d", blocksize);
1794                         goto out_fail;
1795                 }
1796                 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1797                 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1798                 bh = sb_bread(sb, logic_sb_block);
1799                 if (!bh) {
1800                         ext3_msg(sb, KERN_ERR,
1801                                "error: can't read superblock on 2nd try");
1802                         goto failed_mount;
1803                 }
1804                 es = (struct ext3_super_block *)(bh->b_data + offset);
1805                 sbi->s_es = es;
1806                 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
1807                         ext3_msg(sb, KERN_ERR,
1808                                 "error: magic mismatch");
1809                         goto failed_mount;
1810                 }
1811         }
1812
1813         sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1814
1815         if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1816                 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1817                 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1818         } else {
1819                 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1820                 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1821                 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
1822                     (!is_power_of_2(sbi->s_inode_size)) ||
1823                     (sbi->s_inode_size > blocksize)) {
1824                         ext3_msg(sb, KERN_ERR,
1825                                 "error: unsupported inode size: %d",
1826                                 sbi->s_inode_size);
1827                         goto failed_mount;
1828                 }
1829         }
1830         sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1831                                    le32_to_cpu(es->s_log_frag_size);
1832         if (blocksize != sbi->s_frag_size) {
1833                 ext3_msg(sb, KERN_ERR,
1834                        "error: fragsize %lu != blocksize %u (unsupported)",
1835                        sbi->s_frag_size, blocksize);
1836                 goto failed_mount;
1837         }
1838         sbi->s_frags_per_block = 1;
1839         sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1840         sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1841         sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1842         if (EXT3_INODE_SIZE(sb) == 0 || EXT3_INODES_PER_GROUP(sb) == 0)
1843                 goto cantfind_ext3;
1844         sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1845         if (sbi->s_inodes_per_block == 0)
1846                 goto cantfind_ext3;
1847         sbi->s_itb_per_group = sbi->s_inodes_per_group /
1848                                         sbi->s_inodes_per_block;
1849         sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1850         sbi->s_sbh = bh;
1851         sbi->s_mount_state = le16_to_cpu(es->s_state);
1852         sbi->s_addr_per_block_bits = ilog2(EXT3_ADDR_PER_BLOCK(sb));
1853         sbi->s_desc_per_block_bits = ilog2(EXT3_DESC_PER_BLOCK(sb));
1854         for (i=0; i < 4; i++)
1855                 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1856         sbi->s_def_hash_version = es->s_def_hash_version;
1857         i = le32_to_cpu(es->s_flags);
1858         if (i & EXT2_FLAGS_UNSIGNED_HASH)
1859                 sbi->s_hash_unsigned = 3;
1860         else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
1861 #ifdef __CHAR_UNSIGNED__
1862                 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
1863                 sbi->s_hash_unsigned = 3;
1864 #else
1865                 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
1866 #endif
1867         }
1868
1869         if (sbi->s_blocks_per_group > blocksize * 8) {
1870                 ext3_msg(sb, KERN_ERR,
1871                         "#blocks per group too big: %lu",
1872                         sbi->s_blocks_per_group);
1873                 goto failed_mount;
1874         }
1875         if (sbi->s_frags_per_group > blocksize * 8) {
1876                 ext3_msg(sb, KERN_ERR,
1877                         "error: #fragments per group too big: %lu",
1878                         sbi->s_frags_per_group);
1879                 goto failed_mount;
1880         }
1881         if (sbi->s_inodes_per_group > blocksize * 8) {
1882                 ext3_msg(sb, KERN_ERR,
1883                         "error: #inodes per group too big: %lu",
1884                         sbi->s_inodes_per_group);
1885                 goto failed_mount;
1886         }
1887
1888         err = generic_check_addressable(sb->s_blocksize_bits,
1889                                         le32_to_cpu(es->s_blocks_count));
1890         if (err) {
1891                 ext3_msg(sb, KERN_ERR,
1892                         "error: filesystem is too large to mount safely");
1893                 if (sizeof(sector_t) < 8)
1894                         ext3_msg(sb, KERN_ERR,
1895                                 "error: CONFIG_LBDAF not enabled");
1896                 ret = err;
1897                 goto failed_mount;
1898         }
1899
1900         if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1901                 goto cantfind_ext3;
1902         sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1903                                le32_to_cpu(es->s_first_data_block) - 1)
1904                                        / EXT3_BLOCKS_PER_GROUP(sb)) + 1;
1905         db_count = DIV_ROUND_UP(sbi->s_groups_count, EXT3_DESC_PER_BLOCK(sb));
1906         sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1907                                     GFP_KERNEL);
1908         if (sbi->s_group_desc == NULL) {
1909                 ext3_msg(sb, KERN_ERR,
1910                         "error: not enough memory");
1911                 ret = -ENOMEM;
1912                 goto failed_mount;
1913         }
1914
1915         bgl_lock_init(sbi->s_blockgroup_lock);
1916
1917         for (i = 0; i < db_count; i++) {
1918                 block = descriptor_loc(sb, logic_sb_block, i);
1919                 sbi->s_group_desc[i] = sb_bread(sb, block);
1920                 if (!sbi->s_group_desc[i]) {
1921                         ext3_msg(sb, KERN_ERR,
1922                                 "error: can't read group descriptor %d", i);
1923                         db_count = i;
1924                         goto failed_mount2;
1925                 }
1926         }
1927         if (!ext3_check_descriptors (sb)) {
1928                 ext3_msg(sb, KERN_ERR,
1929                         "error: group descriptors corrupted");
1930                 goto failed_mount2;
1931         }
1932         sbi->s_gdb_count = db_count;
1933         get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1934         spin_lock_init(&sbi->s_next_gen_lock);
1935
1936         /* per fileystem reservation list head & lock */
1937         spin_lock_init(&sbi->s_rsv_window_lock);
1938         sbi->s_rsv_window_root = RB_ROOT;
1939         /* Add a single, static dummy reservation to the start of the
1940          * reservation window list --- it gives us a placeholder for
1941          * append-at-start-of-list which makes the allocation logic
1942          * _much_ simpler. */
1943         sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1944         sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1945         sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1946         sbi->s_rsv_window_head.rsv_goal_size = 0;
1947         ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1948
1949         /*
1950          * set up enough so that it can read an inode
1951          */
1952         sb->s_op = &ext3_sops;
1953         sb->s_export_op = &ext3_export_ops;
1954         sb->s_xattr = ext3_xattr_handlers;
1955 #ifdef CONFIG_QUOTA
1956         sb->s_qcop = &ext3_qctl_operations;
1957         sb->dq_op = &ext3_quota_operations;
1958 #endif
1959         memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
1960         INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1961         mutex_init(&sbi->s_orphan_lock);
1962         mutex_init(&sbi->s_resize_lock);
1963
1964         sb->s_root = NULL;
1965
1966         needs_recovery = (es->s_last_orphan != 0 ||
1967                           EXT3_HAS_INCOMPAT_FEATURE(sb,
1968                                     EXT3_FEATURE_INCOMPAT_RECOVER));
1969
1970         /*
1971          * The first inode we look at is the journal inode.  Don't try
1972          * root first: it may be modified in the journal!
1973          */
1974         if (!test_opt(sb, NOLOAD) &&
1975             EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
1976                 if (ext3_load_journal(sb, es, journal_devnum))
1977                         goto failed_mount2;
1978         } else if (journal_inum) {
1979                 if (ext3_create_journal(sb, es, journal_inum))
1980                         goto failed_mount2;
1981         } else {
1982                 if (!silent)
1983                         ext3_msg(sb, KERN_ERR,
1984                                 "error: no journal found. "
1985                                 "mounting ext3 over ext2?");
1986                 goto failed_mount2;
1987         }
1988         err = percpu_counter_init(&sbi->s_freeblocks_counter,
1989                         ext3_count_free_blocks(sb));
1990         if (!err) {
1991                 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1992                                 ext3_count_free_inodes(sb));
1993         }
1994         if (!err) {
1995                 err = percpu_counter_init(&sbi->s_dirs_counter,
1996                                 ext3_count_dirs(sb));
1997         }
1998         if (err) {
1999                 ext3_msg(sb, KERN_ERR, "error: insufficient memory");
2000                 ret = err;
2001                 goto failed_mount3;
2002         }
2003
2004         /* We have now updated the journal if required, so we can
2005          * validate the data journaling mode. */
2006         switch (test_opt(sb, DATA_FLAGS)) {
2007         case 0:
2008                 /* No mode set, assume a default based on the journal
2009                    capabilities: ORDERED_DATA if the journal can
2010                    cope, else JOURNAL_DATA */
2011                 if (journal_check_available_features
2012                     (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
2013                         set_opt(sbi->s_mount_opt, DEFAULT_DATA_MODE);
2014                 else
2015                         set_opt(sbi->s_mount_opt, JOURNAL_DATA);
2016                 break;
2017
2018         case EXT3_MOUNT_ORDERED_DATA:
2019         case EXT3_MOUNT_WRITEBACK_DATA:
2020                 if (!journal_check_available_features
2021                     (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
2022                         ext3_msg(sb, KERN_ERR,
2023                                 "error: journal does not support "
2024                                 "requested data journaling mode");
2025                         goto failed_mount3;
2026                 }
2027         default:
2028                 break;
2029         }
2030
2031         /*
2032          * The journal_load will have done any necessary log recovery,
2033          * so we can safely mount the rest of the filesystem now.
2034          */
2035
2036         root = ext3_iget(sb, EXT3_ROOT_INO);
2037         if (IS_ERR(root)) {
2038                 ext3_msg(sb, KERN_ERR, "error: get root inode failed");
2039                 ret = PTR_ERR(root);
2040                 goto failed_mount3;
2041         }
2042         if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
2043                 iput(root);
2044                 ext3_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck");
2045                 goto failed_mount3;
2046         }
2047         sb->s_root = d_make_root(root);
2048         if (!sb->s_root) {
2049                 ext3_msg(sb, KERN_ERR, "error: get root dentry failed");
2050                 ret = -ENOMEM;
2051                 goto failed_mount3;
2052         }
2053
2054         if (ext3_setup_super(sb, es, sb->s_flags & MS_RDONLY))
2055                 sb->s_flags |= MS_RDONLY;
2056
2057         EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
2058         ext3_orphan_cleanup(sb, es);
2059         EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
2060         if (needs_recovery) {
2061                 ext3_mark_recovery_complete(sb, es);
2062                 ext3_msg(sb, KERN_INFO, "recovery complete");
2063         }
2064         ext3_msg(sb, KERN_INFO, "mounted filesystem with %s data mode",
2065                 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
2066                 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
2067                 "writeback");
2068
2069         return 0;
2070
2071 cantfind_ext3:
2072         if (!silent)
2073                 ext3_msg(sb, KERN_INFO,
2074                         "error: can't find ext3 filesystem on dev %s.",
2075                        sb->s_id);
2076         goto failed_mount;
2077
2078 failed_mount3:
2079         percpu_counter_destroy(&sbi->s_freeblocks_counter);
2080         percpu_counter_destroy(&sbi->s_freeinodes_counter);
2081         percpu_counter_destroy(&sbi->s_dirs_counter);
2082         journal_destroy(sbi->s_journal);
2083 failed_mount2:
2084         for (i = 0; i < db_count; i++)
2085                 brelse(sbi->s_group_desc[i]);
2086         kfree(sbi->s_group_desc);
2087 failed_mount:
2088 #ifdef CONFIG_QUOTA
2089         for (i = 0; i < MAXQUOTAS; i++)
2090                 kfree(sbi->s_qf_names[i]);
2091 #endif
2092         ext3_blkdev_remove(sbi);
2093         brelse(bh);
2094 out_fail:
2095         sb->s_fs_info = NULL;
2096         kfree(sbi->s_blockgroup_lock);
2097         kfree(sbi);
2098         return ret;
2099 }
2100
2101 /*
2102  * Setup any per-fs journal parameters now.  We'll do this both on
2103  * initial mount, once the journal has been initialised but before we've
2104  * done any recovery; and again on any subsequent remount.
2105  */
2106 static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
2107 {
2108         struct ext3_sb_info *sbi = EXT3_SB(sb);
2109
2110         if (sbi->s_commit_interval)
2111                 journal->j_commit_interval = sbi->s_commit_interval;
2112         /* We could also set up an ext3-specific default for the commit
2113          * interval here, but for now we'll just fall back to the jbd
2114          * default. */
2115
2116         spin_lock(&journal->j_state_lock);
2117         if (test_opt(sb, BARRIER))
2118                 journal->j_flags |= JFS_BARRIER;
2119         else
2120                 journal->j_flags &= ~JFS_BARRIER;
2121         if (test_opt(sb, DATA_ERR_ABORT))
2122                 journal->j_flags |= JFS_ABORT_ON_SYNCDATA_ERR;
2123         else
2124                 journal->j_flags &= ~JFS_ABORT_ON_SYNCDATA_ERR;
2125         spin_unlock(&journal->j_state_lock);
2126 }
2127
2128 static journal_t *ext3_get_journal(struct super_block *sb,
2129                                    unsigned int journal_inum)
2130 {
2131         struct inode *journal_inode;
2132         journal_t *journal;
2133
2134         /* First, test for the existence of a valid inode on disk.  Bad
2135          * things happen if we iget() an unused inode, as the subsequent
2136          * iput() will try to delete it. */
2137
2138         journal_inode = ext3_iget(sb, journal_inum);
2139         if (IS_ERR(journal_inode)) {
2140                 ext3_msg(sb, KERN_ERR, "error: no journal found");
2141                 return NULL;
2142         }
2143         if (!journal_inode->i_nlink) {
2144                 make_bad_inode(journal_inode);
2145                 iput(journal_inode);
2146                 ext3_msg(sb, KERN_ERR, "error: journal inode is deleted");
2147                 return NULL;
2148         }
2149
2150         jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2151                   journal_inode, journal_inode->i_size);
2152         if (!S_ISREG(journal_inode->i_mode)) {
2153                 ext3_msg(sb, KERN_ERR, "error: invalid journal inode");
2154                 iput(journal_inode);
2155                 return NULL;
2156         }
2157
2158         journal = journal_init_inode(journal_inode);
2159         if (!journal) {
2160                 ext3_msg(sb, KERN_ERR, "error: could not load journal inode");
2161                 iput(journal_inode);
2162                 return NULL;
2163         }
2164         journal->j_private = sb;
2165         ext3_init_journal_params(sb, journal);
2166         return journal;
2167 }
2168
2169 static journal_t *ext3_get_dev_journal(struct super_block *sb,
2170                                        dev_t j_dev)
2171 {
2172         struct buffer_head * bh;
2173         journal_t *journal;
2174         ext3_fsblk_t start;
2175         ext3_fsblk_t len;
2176         int hblock, blocksize;
2177         ext3_fsblk_t sb_block;
2178         unsigned long offset;
2179         struct ext3_super_block * es;
2180         struct block_device *bdev;
2181
2182         bdev = ext3_blkdev_get(j_dev, sb);
2183         if (bdev == NULL)
2184                 return NULL;
2185
2186         blocksize = sb->s_blocksize;
2187         hblock = bdev_logical_block_size(bdev);
2188         if (blocksize < hblock) {
2189                 ext3_msg(sb, KERN_ERR,
2190                         "error: blocksize too small for journal device");
2191                 goto out_bdev;
2192         }
2193
2194         sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
2195         offset = EXT3_MIN_BLOCK_SIZE % blocksize;
2196         set_blocksize(bdev, blocksize);
2197         if (!(bh = __bread(bdev, sb_block, blocksize))) {
2198                 ext3_msg(sb, KERN_ERR, "error: couldn't read superblock of "
2199                         "external journal");
2200                 goto out_bdev;
2201         }
2202
2203         es = (struct ext3_super_block *) (bh->b_data + offset);
2204         if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
2205             !(le32_to_cpu(es->s_feature_incompat) &
2206               EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2207                 ext3_msg(sb, KERN_ERR, "error: external journal has "
2208                         "bad superblock");
2209                 brelse(bh);
2210                 goto out_bdev;
2211         }
2212
2213         if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2214                 ext3_msg(sb, KERN_ERR, "error: journal UUID does not match");
2215                 brelse(bh);
2216                 goto out_bdev;
2217         }
2218
2219         len = le32_to_cpu(es->s_blocks_count);
2220         start = sb_block + 1;
2221         brelse(bh);     /* we're done with the superblock */
2222
2223         journal = journal_init_dev(bdev, sb->s_bdev,
2224                                         start, len, blocksize);
2225         if (!journal) {
2226                 ext3_msg(sb, KERN_ERR,
2227                         "error: failed to create device journal");
2228                 goto out_bdev;
2229         }
2230         journal->j_private = sb;
2231         if (!bh_uptodate_or_lock(journal->j_sb_buffer)) {
2232                 if (bh_submit_read(journal->j_sb_buffer)) {
2233                         ext3_msg(sb, KERN_ERR, "I/O error on journal device");
2234                         goto out_journal;
2235                 }
2236         }
2237         if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
2238                 ext3_msg(sb, KERN_ERR,
2239                         "error: external journal has more than one "
2240                         "user (unsupported) - %d",
2241                         be32_to_cpu(journal->j_superblock->s_nr_users));
2242                 goto out_journal;
2243         }
2244         EXT3_SB(sb)->journal_bdev = bdev;
2245         ext3_init_journal_params(sb, journal);
2246         return journal;
2247 out_journal:
2248         journal_destroy(journal);
2249 out_bdev:
2250         ext3_blkdev_put(bdev);
2251         return NULL;
2252 }
2253
2254 static int ext3_load_journal(struct super_block *sb,
2255                              struct ext3_super_block *es,
2256                              unsigned long journal_devnum)
2257 {
2258         journal_t *journal;
2259         unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2260         dev_t journal_dev;
2261         int err = 0;
2262         int really_read_only;
2263
2264         if (journal_devnum &&
2265             journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2266                 ext3_msg(sb, KERN_INFO, "external journal device major/minor "
2267                         "numbers have changed");
2268                 journal_dev = new_decode_dev(journal_devnum);
2269         } else
2270                 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2271
2272         really_read_only = bdev_read_only(sb->s_bdev);
2273
2274         /*
2275          * Are we loading a blank journal or performing recovery after a
2276          * crash?  For recovery, we need to check in advance whether we
2277          * can get read-write access to the device.
2278          */
2279
2280         if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
2281                 if (sb->s_flags & MS_RDONLY) {
2282                         ext3_msg(sb, KERN_INFO,
2283                                 "recovery required on readonly filesystem");
2284                         if (really_read_only) {
2285                                 ext3_msg(sb, KERN_ERR, "error: write access "
2286                                         "unavailable, cannot proceed");
2287                                 return -EROFS;
2288                         }
2289                         ext3_msg(sb, KERN_INFO,
2290                                 "write access will be enabled during recovery");
2291                 }
2292         }
2293
2294         if (journal_inum && journal_dev) {
2295                 ext3_msg(sb, KERN_ERR, "error: filesystem has both journal "
2296                        "and inode journals");
2297                 return -EINVAL;
2298         }
2299
2300         if (journal_inum) {
2301                 if (!(journal = ext3_get_journal(sb, journal_inum)))
2302                         return -EINVAL;
2303         } else {
2304                 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
2305                         return -EINVAL;
2306         }
2307
2308         if (!(journal->j_flags & JFS_BARRIER))
2309                 printk(KERN_INFO "EXT3-fs: barriers not enabled\n");
2310
2311         if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2312                 err = journal_update_format(journal);
2313                 if (err)  {
2314                         ext3_msg(sb, KERN_ERR, "error updating journal");
2315                         journal_destroy(journal);
2316                         return err;
2317                 }
2318         }
2319
2320         if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
2321                 err = journal_wipe(journal, !really_read_only);
2322         if (!err)
2323                 err = journal_load(journal);
2324
2325         if (err) {
2326                 ext3_msg(sb, KERN_ERR, "error loading journal");
2327                 journal_destroy(journal);
2328                 return err;
2329         }
2330
2331         EXT3_SB(sb)->s_journal = journal;
2332         ext3_clear_journal_err(sb, es);
2333
2334         if (!really_read_only && journal_devnum &&
2335             journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2336                 es->s_journal_dev = cpu_to_le32(journal_devnum);
2337
2338                 /* Make sure we flush the recovery flag to disk. */
2339                 ext3_commit_super(sb, es, 1);
2340         }
2341
2342         return 0;
2343 }
2344
2345 static int ext3_create_journal(struct super_block *sb,
2346                                struct ext3_super_block *es,
2347                                unsigned int journal_inum)
2348 {
2349         journal_t *journal;
2350         int err;
2351
2352         if (sb->s_flags & MS_RDONLY) {
2353                 ext3_msg(sb, KERN_ERR,
2354                         "error: readonly filesystem when trying to "
2355                         "create journal");
2356                 return -EROFS;
2357         }
2358
2359         journal = ext3_get_journal(sb, journal_inum);
2360         if (!journal)
2361                 return -EINVAL;
2362
2363         ext3_msg(sb, KERN_INFO, "creating new journal on inode %u",
2364                journal_inum);
2365
2366         err = journal_create(journal);
2367         if (err) {
2368                 ext3_msg(sb, KERN_ERR, "error creating journal");
2369                 journal_destroy(journal);
2370                 return -EIO;
2371         }
2372
2373         EXT3_SB(sb)->s_journal = journal;
2374
2375         ext3_update_dynamic_rev(sb);
2376         EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2377         EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2378
2379         es->s_journal_inum = cpu_to_le32(journal_inum);
2380
2381         /* Make sure we flush the recovery flag to disk. */
2382         ext3_commit_super(sb, es, 1);
2383
2384         return 0;
2385 }
2386
2387 static int ext3_commit_super(struct super_block *sb,
2388                                struct ext3_super_block *es,
2389                                int sync)
2390 {
2391         struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
2392         int error = 0;
2393
2394         if (!sbh)
2395                 return error;
2396
2397         if (buffer_write_io_error(sbh)) {
2398                 /*
2399                  * Oh, dear.  A previous attempt to write the
2400                  * superblock failed.  This could happen because the
2401                  * USB device was yanked out.  Or it could happen to
2402                  * be a transient write error and maybe the block will
2403                  * be remapped.  Nothing we can do but to retry the
2404                  * write and hope for the best.
2405                  */
2406                 ext3_msg(sb, KERN_ERR, "previous I/O error to "
2407                        "superblock detected");
2408                 clear_buffer_write_io_error(sbh);
2409                 set_buffer_uptodate(sbh);
2410         }
2411         /*
2412          * If the file system is mounted read-only, don't update the
2413          * superblock write time.  This avoids updating the superblock
2414          * write time when we are mounting the root file system
2415          * read/only but we need to replay the journal; at that point,
2416          * for people who are east of GMT and who make their clock
2417          * tick in localtime for Windows bug-for-bug compatibility,
2418          * the clock is set in the future, and this will cause e2fsck
2419          * to complain and force a full file system check.
2420          */
2421         if (!(sb->s_flags & MS_RDONLY))
2422                 es->s_wtime = cpu_to_le32(get_seconds());
2423         es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2424         es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2425         BUFFER_TRACE(sbh, "marking dirty");
2426         mark_buffer_dirty(sbh);
2427         if (sync) {
2428                 error = sync_dirty_buffer(sbh);
2429                 if (buffer_write_io_error(sbh)) {
2430                         ext3_msg(sb, KERN_ERR, "I/O error while writing "
2431                                "superblock");
2432                         clear_buffer_write_io_error(sbh);
2433                         set_buffer_uptodate(sbh);
2434                 }
2435         }
2436         return error;
2437 }
2438
2439
2440 /*
2441  * Have we just finished recovery?  If so, and if we are mounting (or
2442  * remounting) the filesystem readonly, then we will end up with a
2443  * consistent fs on disk.  Record that fact.
2444  */
2445 static void ext3_mark_recovery_complete(struct super_block * sb,
2446                                         struct ext3_super_block * es)
2447 {
2448         journal_t *journal = EXT3_SB(sb)->s_journal;
2449
2450         journal_lock_updates(journal);
2451         if (journal_flush(journal) < 0)
2452                 goto out;
2453
2454         if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2455             sb->s_flags & MS_RDONLY) {
2456                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2457                 ext3_commit_super(sb, es, 1);
2458         }
2459
2460 out:
2461         journal_unlock_updates(journal);
2462 }
2463
2464 /*
2465  * If we are mounting (or read-write remounting) a filesystem whose journal
2466  * has recorded an error from a previous lifetime, move that error to the
2467  * main filesystem now.
2468  */
2469 static void ext3_clear_journal_err(struct super_block *sb,
2470                                    struct ext3_super_block *es)
2471 {
2472         journal_t *journal;
2473         int j_errno;
2474         const char *errstr;
2475
2476         journal = EXT3_SB(sb)->s_journal;
2477
2478         /*
2479          * Now check for any error status which may have been recorded in the
2480          * journal by a prior ext3_error() or ext3_abort()
2481          */
2482
2483         j_errno = journal_errno(journal);
2484         if (j_errno) {
2485                 char nbuf[16];
2486
2487                 errstr = ext3_decode_error(sb, j_errno, nbuf);
2488                 ext3_warning(sb, __func__, "Filesystem error recorded "
2489                              "from previous mount: %s", errstr);
2490                 ext3_warning(sb, __func__, "Marking fs in need of "
2491                              "filesystem check.");
2492
2493                 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2494                 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2495                 ext3_commit_super (sb, es, 1);
2496
2497                 journal_clear_err(journal);
2498         }
2499 }
2500
2501 /*
2502  * Force the running and committing transactions to commit,
2503  * and wait on the commit.
2504  */
2505 int ext3_force_commit(struct super_block *sb)
2506 {
2507         journal_t *journal;
2508         int ret;
2509
2510         if (sb->s_flags & MS_RDONLY)
2511                 return 0;
2512
2513         journal = EXT3_SB(sb)->s_journal;
2514         ret = ext3_journal_force_commit(journal);
2515         return ret;
2516 }
2517
2518 static int ext3_sync_fs(struct super_block *sb, int wait)
2519 {
2520         tid_t target;
2521
2522         trace_ext3_sync_fs(sb, wait);
2523         /*
2524          * Writeback quota in non-journalled quota case - journalled quota has
2525          * no dirty dquots
2526          */
2527         dquot_writeback_dquots(sb, -1);
2528         if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2529                 if (wait)
2530                         log_wait_commit(EXT3_SB(sb)->s_journal, target);
2531         }
2532         return 0;
2533 }
2534
2535 /*
2536  * LVM calls this function before a (read-only) snapshot is created.  This
2537  * gives us a chance to flush the journal completely and mark the fs clean.
2538  */
2539 static int ext3_freeze(struct super_block *sb)
2540 {
2541         int error = 0;
2542         journal_t *journal;
2543
2544         if (!(sb->s_flags & MS_RDONLY)) {
2545                 journal = EXT3_SB(sb)->s_journal;
2546
2547                 /* Now we set up the journal barrier. */
2548                 journal_lock_updates(journal);
2549
2550                 /*
2551                  * We don't want to clear needs_recovery flag when we failed
2552                  * to flush the journal.
2553                  */
2554                 error = journal_flush(journal);
2555                 if (error < 0)
2556                         goto out;
2557
2558                 /* Journal blocked and flushed, clear needs_recovery flag. */
2559                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2560                 error = ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2561                 if (error)
2562                         goto out;
2563         }
2564         return 0;
2565
2566 out:
2567         journal_unlock_updates(journal);
2568         return error;
2569 }
2570
2571 /*
2572  * Called by LVM after the snapshot is done.  We need to reset the RECOVER
2573  * flag here, even though the filesystem is not technically dirty yet.
2574  */
2575 static int ext3_unfreeze(struct super_block *sb)
2576 {
2577         if (!(sb->s_flags & MS_RDONLY)) {
2578                 /* Reser the needs_recovery flag before the fs is unlocked. */
2579                 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2580                 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2581                 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2582         }
2583         return 0;
2584 }
2585
2586 static int ext3_remount (struct super_block * sb, int * flags, char * data)
2587 {
2588         struct ext3_super_block * es;
2589         struct ext3_sb_info *sbi = EXT3_SB(sb);
2590         ext3_fsblk_t n_blocks_count = 0;
2591         unsigned long old_sb_flags;
2592         struct ext3_mount_options old_opts;
2593         int enable_quota = 0;
2594         int err;
2595 #ifdef CONFIG_QUOTA
2596         int i;
2597 #endif
2598
2599         /* Store the original options */
2600         old_sb_flags = sb->s_flags;
2601         old_opts.s_mount_opt = sbi->s_mount_opt;
2602         old_opts.s_resuid = sbi->s_resuid;
2603         old_opts.s_resgid = sbi->s_resgid;
2604         old_opts.s_commit_interval = sbi->s_commit_interval;
2605 #ifdef CONFIG_QUOTA
2606         old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2607         for (i = 0; i < MAXQUOTAS; i++)
2608                 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2609 #endif
2610
2611         /*
2612          * Allow the "check" option to be passed as a remount option.
2613          */
2614         if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2615                 err = -EINVAL;
2616                 goto restore_opts;
2617         }
2618
2619         if (test_opt(sb, ABORT))
2620                 ext3_abort(sb, __func__, "Abort forced by user");
2621
2622         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2623                 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
2624
2625         es = sbi->s_es;
2626
2627         ext3_init_journal_params(sb, sbi->s_journal);
2628
2629         if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2630                 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
2631                 if (test_opt(sb, ABORT)) {
2632                         err = -EROFS;
2633                         goto restore_opts;
2634                 }
2635
2636                 if (*flags & MS_RDONLY) {
2637                         err = dquot_suspend(sb, -1);
2638                         if (err < 0)
2639                                 goto restore_opts;
2640
2641                         /*
2642                          * First of all, the unconditional stuff we have to do
2643                          * to disable replay of the journal when we next remount
2644                          */
2645                         sb->s_flags |= MS_RDONLY;
2646
2647                         /*
2648                          * OK, test if we are remounting a valid rw partition
2649                          * readonly, and if so set the rdonly flag and then
2650                          * mark the partition as valid again.
2651                          */
2652                         if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2653                             (sbi->s_mount_state & EXT3_VALID_FS))
2654                                 es->s_state = cpu_to_le16(sbi->s_mount_state);
2655
2656                         ext3_mark_recovery_complete(sb, es);
2657                 } else {
2658                         __le32 ret;
2659                         if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2660                                         ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2661                                 ext3_msg(sb, KERN_WARNING,
2662                                         "warning: couldn't remount RDWR "
2663                                         "because of unsupported optional "
2664                                         "features (%x)", le32_to_cpu(ret));
2665                                 err = -EROFS;
2666                                 goto restore_opts;
2667                         }
2668
2669                         /*
2670                          * If we have an unprocessed orphan list hanging
2671                          * around from a previously readonly bdev mount,
2672                          * require a full umount & mount for now.
2673                          */
2674                         if (es->s_last_orphan) {
2675                                 ext3_msg(sb, KERN_WARNING, "warning: couldn't "
2676                                        "remount RDWR because of unprocessed "
2677                                        "orphan inode list.  Please "
2678                                        "umount & mount instead.");
2679                                 err = -EINVAL;
2680                                 goto restore_opts;
2681                         }
2682
2683                         /*
2684                          * Mounting a RDONLY partition read-write, so reread
2685                          * and store the current valid flag.  (It may have
2686                          * been changed by e2fsck since we originally mounted
2687                          * the partition.)
2688                          */
2689                         ext3_clear_journal_err(sb, es);
2690                         sbi->s_mount_state = le16_to_cpu(es->s_state);
2691                         if ((err = ext3_group_extend(sb, es, n_blocks_count)))
2692                                 goto restore_opts;
2693                         if (!ext3_setup_super (sb, es, 0))
2694                                 sb->s_flags &= ~MS_RDONLY;
2695                         enable_quota = 1;
2696                 }
2697         }
2698 #ifdef CONFIG_QUOTA
2699         /* Release old quota file names */
2700         for (i = 0; i < MAXQUOTAS; i++)
2701                 if (old_opts.s_qf_names[i] &&
2702                     old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2703                         kfree(old_opts.s_qf_names[i]);
2704 #endif
2705         if (enable_quota)
2706                 dquot_resume(sb, -1);
2707         return 0;
2708 restore_opts:
2709         sb->s_flags = old_sb_flags;
2710         sbi->s_mount_opt = old_opts.s_mount_opt;
2711         sbi->s_resuid = old_opts.s_resuid;
2712         sbi->s_resgid = old_opts.s_resgid;
2713         sbi->s_commit_interval = old_opts.s_commit_interval;
2714 #ifdef CONFIG_QUOTA
2715         sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2716         for (i = 0; i < MAXQUOTAS; i++) {
2717                 if (sbi->s_qf_names[i] &&
2718                     old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2719                         kfree(sbi->s_qf_names[i]);
2720                 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2721         }
2722 #endif
2723         return err;
2724 }
2725
2726 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
2727 {
2728         struct super_block *sb = dentry->d_sb;
2729         struct ext3_sb_info *sbi = EXT3_SB(sb);
2730         struct ext3_super_block *es = sbi->s_es;
2731         u64 fsid;
2732
2733         if (test_opt(sb, MINIX_DF)) {
2734                 sbi->s_overhead_last = 0;
2735         } else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
2736                 unsigned long ngroups = sbi->s_groups_count, i;
2737                 ext3_fsblk_t overhead = 0;
2738                 smp_rmb();
2739
2740                 /*
2741                  * Compute the overhead (FS structures).  This is constant
2742                  * for a given filesystem unless the number of block groups
2743                  * changes so we cache the previous value until it does.
2744                  */
2745
2746                 /*
2747                  * All of the blocks before first_data_block are
2748                  * overhead
2749                  */
2750                 overhead = le32_to_cpu(es->s_first_data_block);
2751
2752                 /*
2753                  * Add the overhead attributed to the superblock and
2754                  * block group descriptors.  If the sparse superblocks
2755                  * feature is turned on, then not all groups have this.
2756                  */
2757                 for (i = 0; i < ngroups; i++) {
2758                         overhead += ext3_bg_has_super(sb, i) +
2759                                 ext3_bg_num_gdb(sb, i);
2760                         cond_resched();
2761                 }
2762
2763                 /*
2764                  * Every block group has an inode bitmap, a block
2765                  * bitmap, and an inode table.
2766                  */
2767                 overhead += ngroups * (2 + sbi->s_itb_per_group);
2768                 sbi->s_overhead_last = overhead;
2769                 smp_wmb();
2770                 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
2771         }
2772
2773         buf->f_type = EXT3_SUPER_MAGIC;
2774         buf->f_bsize = sb->s_blocksize;
2775         buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
2776         buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
2777         buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2778         if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2779                 buf->f_bavail = 0;
2780         buf->f_files = le32_to_cpu(es->s_inodes_count);
2781         buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
2782         buf->f_namelen = EXT3_NAME_LEN;
2783         fsid = le64_to_cpup((void *)es->s_uuid) ^
2784                le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2785         buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2786         buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
2787         return 0;
2788 }
2789
2790 /* Helper function for writing quotas on sync - we need to start transaction before quota file
2791  * is locked for write. Otherwise the are possible deadlocks:
2792  * Process 1                         Process 2
2793  * ext3_create()                     quota_sync()
2794  *   journal_start()                   write_dquot()
2795  *   dquot_initialize()                       down(dqio_mutex)
2796  *     down(dqio_mutex)                    journal_start()
2797  *
2798  */
2799
2800 #ifdef CONFIG_QUOTA
2801
2802 static inline struct inode *dquot_to_inode(struct dquot *dquot)
2803 {
2804         return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
2805 }
2806
2807 static int ext3_write_dquot(struct dquot *dquot)
2808 {
2809         int ret, err;
2810         handle_t *handle;
2811         struct inode *inode;
2812
2813         inode = dquot_to_inode(dquot);
2814         handle = ext3_journal_start(inode,
2815                                         EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2816         if (IS_ERR(handle))
2817                 return PTR_ERR(handle);
2818         ret = dquot_commit(dquot);
2819         err = ext3_journal_stop(handle);
2820         if (!ret)
2821                 ret = err;
2822         return ret;
2823 }
2824
2825 static int ext3_acquire_dquot(struct dquot *dquot)
2826 {
2827         int ret, err;
2828         handle_t *handle;
2829
2830         handle = ext3_journal_start(dquot_to_inode(dquot),
2831                                         EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2832         if (IS_ERR(handle))
2833                 return PTR_ERR(handle);
2834         ret = dquot_acquire(dquot);
2835         err = ext3_journal_stop(handle);
2836         if (!ret)
2837                 ret = err;
2838         return ret;
2839 }
2840
2841 static int ext3_release_dquot(struct dquot *dquot)
2842 {
2843         int ret, err;
2844         handle_t *handle;
2845
2846         handle = ext3_journal_start(dquot_to_inode(dquot),
2847                                         EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2848         if (IS_ERR(handle)) {
2849                 /* Release dquot anyway to avoid endless cycle in dqput() */
2850                 dquot_release(dquot);
2851                 return PTR_ERR(handle);
2852         }
2853         ret = dquot_release(dquot);
2854         err = ext3_journal_stop(handle);
2855         if (!ret)
2856                 ret = err;
2857         return ret;
2858 }
2859
2860 static int ext3_mark_dquot_dirty(struct dquot *dquot)
2861 {
2862         /* Are we journaling quotas? */
2863         if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2864             EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2865                 dquot_mark_dquot_dirty(dquot);
2866                 return ext3_write_dquot(dquot);
2867         } else {
2868                 return dquot_mark_dquot_dirty(dquot);
2869         }
2870 }
2871
2872 static int ext3_write_info(struct super_block *sb, int type)
2873 {
2874         int ret, err;
2875         handle_t *handle;
2876
2877         /* Data block + inode block */
2878         handle = ext3_journal_start(sb->s_root->d_inode, 2);
2879         if (IS_ERR(handle))
2880                 return PTR_ERR(handle);
2881         ret = dquot_commit_info(sb, type);
2882         err = ext3_journal_stop(handle);
2883         if (!ret)
2884                 ret = err;
2885         return ret;
2886 }
2887
2888 /*
2889  * Turn on quotas during mount time - we need to find
2890  * the quota file and such...
2891  */
2892 static int ext3_quota_on_mount(struct super_block *sb, int type)
2893 {
2894         return dquot_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2895                                         EXT3_SB(sb)->s_jquota_fmt, type);
2896 }
2897
2898 /*
2899  * Standard function to be called on quota_on
2900  */
2901 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
2902                          struct path *path)
2903 {
2904         int err;
2905
2906         if (!test_opt(sb, QUOTA))
2907                 return -EINVAL;
2908
2909         /* Quotafile not on the same filesystem? */
2910         if (path->dentry->d_sb != sb)
2911                 return -EXDEV;
2912         /* Journaling quota? */
2913         if (EXT3_SB(sb)->s_qf_names[type]) {
2914                 /* Quotafile not of fs root? */
2915                 if (path->dentry->d_parent != sb->s_root)
2916                         ext3_msg(sb, KERN_WARNING,
2917                                 "warning: Quota file not on filesystem root. "
2918                                 "Journaled quota will not work.");
2919         }
2920
2921         /*
2922          * When we journal data on quota file, we have to flush journal to see
2923          * all updates to the file when we bypass pagecache...
2924          */
2925         if (ext3_should_journal_data(path->dentry->d_inode)) {
2926                 /*
2927                  * We don't need to lock updates but journal_flush() could
2928                  * otherwise be livelocked...
2929                  */
2930                 journal_lock_updates(EXT3_SB(sb)->s_journal);
2931                 err = journal_flush(EXT3_SB(sb)->s_journal);
2932                 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2933                 if (err)
2934                         return err;
2935         }
2936
2937         return dquot_quota_on(sb, type, format_id, path);
2938 }
2939
2940 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2941  * acquiring the locks... As quota files are never truncated and quota code
2942  * itself serializes the operations (and no one else should touch the files)
2943  * we don't have to be afraid of races */
2944 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2945                                size_t len, loff_t off)
2946 {
2947         struct inode *inode = sb_dqopt(sb)->files[type];
2948         sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2949         int err = 0;
2950         int offset = off & (sb->s_blocksize - 1);
2951         int tocopy;
2952         size_t toread;
2953         struct buffer_head *bh;
2954         loff_t i_size = i_size_read(inode);
2955
2956         if (off > i_size)
2957                 return 0;
2958         if (off+len > i_size)
2959                 len = i_size-off;
2960         toread = len;
2961         while (toread > 0) {
2962                 tocopy = sb->s_blocksize - offset < toread ?
2963                                 sb->s_blocksize - offset : toread;
2964                 bh = ext3_bread(NULL, inode, blk, 0, &err);
2965                 if (err)
2966                         return err;
2967                 if (!bh)        /* A hole? */
2968                         memset(data, 0, tocopy);
2969                 else
2970                         memcpy(data, bh->b_data+offset, tocopy);
2971                 brelse(bh);
2972                 offset = 0;
2973                 toread -= tocopy;
2974                 data += tocopy;
2975                 blk++;
2976         }
2977         return len;
2978 }
2979
2980 /* Write to quotafile (we know the transaction is already started and has
2981  * enough credits) */
2982 static ssize_t ext3_quota_write(struct super_block *sb, int type,
2983                                 const char *data, size_t len, loff_t off)
2984 {
2985         struct inode *inode = sb_dqopt(sb)->files[type];
2986         sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2987         int err = 0;
2988         int offset = off & (sb->s_blocksize - 1);
2989         int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
2990         struct buffer_head *bh;
2991         handle_t *handle = journal_current_handle();
2992
2993         if (!handle) {
2994                 ext3_msg(sb, KERN_WARNING,
2995                         "warning: quota write (off=%llu, len=%llu)"
2996                         " cancelled because transaction is not started.",
2997                         (unsigned long long)off, (unsigned long long)len);
2998                 return -EIO;
2999         }
3000
3001         /*
3002          * Since we account only one data block in transaction credits,
3003          * then it is impossible to cross a block boundary.
3004          */
3005         if (sb->s_blocksize - offset < len) {
3006                 ext3_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
3007                         " cancelled because not block aligned",
3008                         (unsigned long long)off, (unsigned long long)len);
3009                 return -EIO;
3010         }
3011         bh = ext3_bread(handle, inode, blk, 1, &err);
3012         if (!bh)
3013                 goto out;
3014         if (journal_quota) {
3015                 err = ext3_journal_get_write_access(handle, bh);
3016                 if (err) {
3017                         brelse(bh);
3018                         goto out;
3019                 }
3020         }
3021         lock_buffer(bh);
3022         memcpy(bh->b_data+offset, data, len);
3023         flush_dcache_page(bh->b_page);
3024         unlock_buffer(bh);
3025         if (journal_quota)
3026                 err = ext3_journal_dirty_metadata(handle, bh);
3027         else {
3028                 /* Always do at least ordered writes for quotas */
3029                 err = ext3_journal_dirty_data(handle, bh);
3030                 mark_buffer_dirty(bh);
3031         }
3032         brelse(bh);
3033 out:
3034         if (err)
3035                 return err;
3036         if (inode->i_size < off + len) {
3037                 i_size_write(inode, off + len);
3038                 EXT3_I(inode)->i_disksize = inode->i_size;
3039         }
3040         inode->i_version++;
3041         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
3042         ext3_mark_inode_dirty(handle, inode);
3043         return len;
3044 }
3045
3046 #endif
3047
3048 static struct dentry *ext3_mount(struct file_system_type *fs_type,
3049         int flags, const char *dev_name, void *data)
3050 {
3051         return mount_bdev(fs_type, flags, dev_name, data, ext3_fill_super);
3052 }
3053
3054 static struct file_system_type ext3_fs_type = {
3055         .owner          = THIS_MODULE,
3056         .name           = "ext3",
3057         .mount          = ext3_mount,
3058         .kill_sb        = kill_block_super,
3059         .fs_flags       = FS_REQUIRES_DEV,
3060 };
3061
3062 static int __init init_ext3_fs(void)
3063 {
3064         int err = init_ext3_xattr();
3065         if (err)
3066                 return err;
3067         err = init_inodecache();
3068         if (err)
3069                 goto out1;
3070         err = register_filesystem(&ext3_fs_type);
3071         if (err)
3072                 goto out;
3073         return 0;
3074 out:
3075         destroy_inodecache();
3076 out1:
3077         exit_ext3_xattr();
3078         return err;
3079 }
3080
3081 static void __exit exit_ext3_fs(void)
3082 {
3083         unregister_filesystem(&ext3_fs_type);
3084         destroy_inodecache();
3085         exit_ext3_xattr();
3086 }
3087
3088 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
3089 MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
3090 MODULE_LICENSE("GPL");
3091 module_init(init_ext3_fs)
3092 module_exit(exit_ext3_fs)