fs/ext3/super.c

   1 /*
   2  *  linux/fs/ext3/super.c
   3  *
   4  * Copyright (C) 1992, 1993, 1994, 1995
   5  * Remy Card (card@masi.ibp.fr)
   6  * Laboratoire MASI - Institut Blaise Pascal
   7  * Universite Pierre et Marie Curie (Paris VI)
   8  *
   9  *  from
  10  *
  11  *  linux/fs/minix/inode.c
  12  *
  13  *  Copyright (C) 1991, 1992  Linus Torvalds
  14  *
  15  *  Big-endian to little-endian byte-swapping/bitmaps by
  16  *        David S. Miller (davem@caip.rutgers.edu), 1995
  17  */
  18
  19 #include <linux/module.h>
  20 #include <linux/string.h>
  21 #include <linux/fs.h>
  22 #include <linux/time.h>
  23 #include <linux/jbd.h>
  24 #include <linux/ext3_fs.h>
  25 #include <linux/ext3_jbd.h>
  26 #include <linux/slab.h>
  27 #include <linux/init.h>
  28 #include <linux/blkdev.h>
  29 #include <linux/parser.h>
  30 #include <linux/smp_lock.h>
  31 #include <linux/buffer_head.h>
  32 #include <linux/exportfs.h>
  33 #include <linux/vfs.h>
  34 #include <linux/random.h>
  35 #include <linux/mount.h>
  36 #include <linux/namei.h>
  37 #include <linux/quotaops.h>
  38 #include <linux/seq_file.h>
  39 #include <linux/log2.h>
  40
  41 #include <asm/uaccess.h>
  42
  43 #include "xattr.h"
  44 #include "acl.h"
  45 #include "namei.h"
  46
  47 #ifdef CONFIG_EXT3_DEFAULTS_TO_ORDERED
  48   #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_ORDERED_DATA
  49 #else
  50   #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_WRITEBACK_DATA
  51 #endif
  52
  53 static int ext3_load_journal(struct super_block *, struct ext3_super_block *,
  54                              unsigned long journal_devnum);
  55 static int ext3_create_journal(struct super_block *, struct ext3_super_block *,
  56                                unsigned int);
  57 static int ext3_commit_super(struct super_block *sb,
  58                                struct ext3_super_block *es,
  59                                int sync);
  60 static void ext3_mark_recovery_complete(struct super_block * sb,
  61                                         struct ext3_super_block * es);
  62 static void ext3_clear_journal_err(struct super_block * sb,
  63                                    struct ext3_super_block * es);
  64 static int ext3_sync_fs(struct super_block *sb, int wait);
  65 static const char *ext3_decode_error(struct super_block * sb, int errno,
  66                                      char nbuf[16]);
  67 static int ext3_remount (struct super_block * sb, int * flags, char * data);
  68 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf);
  69 static int ext3_unfreeze(struct super_block *sb);
  70 static int ext3_freeze(struct super_block *sb);
  71
  72 /*
  73  * Wrappers for journal_start/end.
  74  *
  75  * The only special thing we need to do here is to make sure that all
  76  * journal_end calls result in the superblock being marked dirty, so
  77  * that sync() will call the filesystem's write_super callback if
  78  * appropriate.
  79  */
  80 handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks)
  81 {
  82         journal_t *journal;
  83
  84         if (sb->s_flags & MS_RDONLY)
  85                 return ERR_PTR(-EROFS);
  86
  87         /* Special case here: if the journal has aborted behind our
  88          * backs (eg. EIO in the commit thread), then we still need to
  89          * take the FS itself readonly cleanly. */
  90         journal = EXT3_SB(sb)->s_journal;
  91         if (is_journal_aborted(journal)) {
  92                 ext3_abort(sb, __func__,
  93                            "Detected aborted journal");
  94                 return ERR_PTR(-EROFS);
  95         }
  96
  97         return journal_start(journal, nblocks);
  98 }
  99
 100 /*
 101  * The only special thing we need to do here is to make sure that all
 102  * journal_stop calls result in the superblock being marked dirty, so
 103  * that sync() will call the filesystem's write_super callback if
 104  * appropriate.
 105  */
 106 int __ext3_journal_stop(const char *where, handle_t *handle)
 107 {
 108         struct super_block *sb;
 109         int err;
 110         int rc;
 111
 112         sb = handle->h_transaction->t_journal->j_private;
 113         err = handle->h_err;
 114         rc = journal_stop(handle);
 115
 116         if (!err)
 117                 err = rc;
 118         if (err)
 119                 __ext3_std_error(sb, where, err);
 120         return err;
 121 }
 122
 123 void ext3_journal_abort_handle(const char *caller, const char *err_fn,
 124                 struct buffer_head *bh, handle_t *handle, int err)
 125 {
 126         char nbuf[16];
 127         const char *errstr = ext3_decode_error(NULL, err, nbuf);
 128
 129         if (bh)
 130                 BUFFER_TRACE(bh, "abort");
 131
 132         if (!handle->h_err)
 133                 handle->h_err = err;
 134
 135         if (is_handle_aborted(handle))
 136                 return;
 137
 138         printk(KERN_ERR "EXT3-fs: %s: aborting transaction: %s in %s\n",
 139                 caller, errstr, err_fn);
 140
 141         journal_abort_handle(handle);
 142 }
 143
 144 void ext3_msg(struct super_block *sb, const char *prefix,
 145                 const char *fmt, ...)
 146 {
 147         va_list args;
 148
 149         va_start(args, fmt);
 150         printk("%sEXT3-fs (%s): ", prefix, sb->s_id);
 151         vprintk(fmt, args);
 152         printk("\n");
 153         va_end(args);
 154 }
 155
 156 /* Deal with the reporting of failure conditions on a filesystem such as
 157  * inconsistencies detected or read IO failures.
 158  *
 159  * On ext2, we can store the error state of the filesystem in the
 160  * superblock.  That is not possible on ext3, because we may have other
 161  * write ordering constraints on the superblock which prevent us from
 162  * writing it out straight away; and given that the journal is about to
 163  * be aborted, we can't rely on the current, or future, transactions to
 164  * write out the superblock safely.
 165  *
 166  * We'll just use the journal_abort() error code to record an error in
 167  * the journal instead.  On recovery, the journal will complain about
 168  * that error until we've noted it down and cleared it.
 169  */
 170
 171 static void ext3_handle_error(struct super_block *sb)
 172 {
 173         struct ext3_super_block *es = EXT3_SB(sb)->s_es;
 174
 175         EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
 176         es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
 177
 178         if (sb->s_flags & MS_RDONLY)
 179                 return;
 180
 181         if (!test_opt (sb, ERRORS_CONT)) {
 182                 journal_t *journal = EXT3_SB(sb)->s_journal;
 183
 184                 set_opt(EXT3_SB(sb)->s_mount_opt, ABORT);
 185                 if (journal)
 186                         journal_abort(journal, -EIO);
 187         }
 188         if (test_opt (sb, ERRORS_RO)) {
 189                 ext3_msg(sb, KERN_CRIT,
 190                         "error: remounting filesystem read-only");
 191                 sb->s_flags |= MS_RDONLY;
 192         }
 193         ext3_commit_super(sb, es, 1);
 194         if (test_opt(sb, ERRORS_PANIC))
 195                 panic("EXT3-fs (%s): panic forced after error\n",
 196                         sb->s_id);
 197 }
 198
 199 void ext3_error (struct super_block * sb, const char * function,
 200                  const char * fmt, ...)
 201 {
 202         va_list args;
 203
 204         va_start(args, fmt);
 205         printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
 206         vprintk(fmt, args);
 207         printk("\n");
 208         va_end(args);
 209
 210         ext3_handle_error(sb);
 211 }
 212
 213 static const char *ext3_decode_error(struct super_block * sb, int errno,
 214                                      char nbuf[16])
 215 {
 216         char *errstr = NULL;
 217
 218         switch (errno) {
 219         case -EIO:
 220                 errstr = "IO failure";
 221                 break;
 222         case -ENOMEM:
 223                 errstr = "Out of memory";
 224                 break;
 225         case -EROFS:
 226                 if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT)
 227                         errstr = "Journal has aborted";
 228                 else
 229                         errstr = "Readonly filesystem";
 230                 break;
 231         default:
 232                 /* If the caller passed in an extra buffer for unknown
 233                  * errors, textualise them now.  Else we just return
 234                  * NULL. */
 235                 if (nbuf) {
 236                         /* Check for truncated error codes... */
 237                         if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
 238                                 errstr = nbuf;
 239                 }
 240                 break;
 241         }
 242
 243         return errstr;
 244 }
 245
 246 /* __ext3_std_error decodes expected errors from journaling functions
 247  * automatically and invokes the appropriate error response.  */
 248
 249 void __ext3_std_error (struct super_block * sb, const char * function,
 250                        int errno)
 251 {
 252         char nbuf[16];
 253         const char *errstr;
 254
 255         /* Special case: if the error is EROFS, and we're not already
 256          * inside a transaction, then there's really no point in logging
 257          * an error. */
 258         if (errno == -EROFS && journal_current_handle() == NULL &&
 259             (sb->s_flags & MS_RDONLY))
 260                 return;
 261
 262         errstr = ext3_decode_error(sb, errno, nbuf);
 263         ext3_msg(sb, KERN_CRIT, "error in %s: %s", function, errstr);
 264
 265         ext3_handle_error(sb);
 266 }
 267
 268 /*
 269  * ext3_abort is a much stronger failure handler than ext3_error.  The
 270  * abort function may be used to deal with unrecoverable failures such
 271  * as journal IO errors or ENOMEM at a critical moment in log management.
 272  *
 273  * We unconditionally force the filesystem into an ABORT|READONLY state,
 274  * unless the error response on the fs has been set to panic in which
 275  * case we take the easy way out and panic immediately.
 276  */
 277
 278 void ext3_abort (struct super_block * sb, const char * function,
 279                  const char * fmt, ...)
 280 {
 281         va_list args;
 282
 283         va_start(args, fmt);
 284         printk(KERN_CRIT "EXT3-fs (%s): error: %s: ", sb->s_id, function);
 285         vprintk(fmt, args);
 286         printk("\n");
 287         va_end(args);
 288
 289         if (test_opt(sb, ERRORS_PANIC))
 290                 panic("EXT3-fs: panic from previous error\n");
 291
 292         if (sb->s_flags & MS_RDONLY)
 293                 return;
 294
 295         ext3_msg(sb, KERN_CRIT,
 296                 "error: remounting filesystem read-only");
 297         EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
 298         sb->s_flags |= MS_RDONLY;
 299         set_opt(EXT3_SB(sb)->s_mount_opt, ABORT);
 300         if (EXT3_SB(sb)->s_journal)
 301                 journal_abort(EXT3_SB(sb)->s_journal, -EIO);
 302 }
 303
 304 void ext3_warning (struct super_block * sb, const char * function,
 305                    const char * fmt, ...)
 306 {
 307         va_list args;
 308
 309         va_start(args, fmt);
 310         printk(KERN_WARNING "EXT3-fs (%s): warning: %s: ",
 311                sb->s_id, function);
 312         vprintk(fmt, args);
 313         printk("\n");
 314         va_end(args);
 315 }
 316
 317 void ext3_update_dynamic_rev(struct super_block *sb)
 318 {
 319         struct ext3_super_block *es = EXT3_SB(sb)->s_es;
 320
 321         if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
 322                 return;
 323
 324         ext3_msg(sb, KERN_WARNING,
 325                 "warning: updating to rev %d because of "
 326                 "new feature flag, running e2fsck is recommended",
 327                 EXT3_DYNAMIC_REV);
 328
 329         es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO);
 330         es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE);
 331         es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV);
 332         /* leave es->s_feature_*compat flags alone */
 333         /* es->s_uuid will be set by e2fsck if empty */
 334
 335         /*
 336          * The rest of the superblock fields should be zero, and if not it
 337          * means they are likely already in use, so leave them alone.  We
 338          * can leave it up to e2fsck to clean up any inconsistencies there.
 339          */
 340 }
 341
 342 /*
 343  * Open the external journal device
 344  */
 345 static struct block_device *ext3_blkdev_get(dev_t dev, struct super_block *sb)
 346 {
 347         struct block_device *bdev;
 348         char b[BDEVNAME_SIZE];
 349
 350         bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
 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         bd_release(bdev);
 368         return blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
 369 }
 370
 371 static int ext3_blkdev_remove(struct ext3_sb_info *sbi)
 372 {
 373         struct block_device *bdev;
 374         int ret = -ENODEV;
 375
 376         bdev = sbi->journal_bdev;
 377         if (bdev) {
 378                 ret = ext3_blkdev_put(bdev);
 379                 sbi->journal_bdev = NULL;
 380         }
 381         return ret;
 382 }
 383
 384 static inline struct inode *orphan_list_entry(struct list_head *l)
 385 {
 386         return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
 387 }
 388
 389 static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
 390 {
 391         struct list_head *l;
 392
 393         ext3_msg(sb, KERN_ERR, "error: sb orphan head is %d",
 394                le32_to_cpu(sbi->s_es->s_last_orphan));
 395
 396         ext3_msg(sb, KERN_ERR, "sb_info orphan list:");
 397         list_for_each(l, &sbi->s_orphan) {
 398                 struct inode *inode = orphan_list_entry(l);
 399                 ext3_msg(sb, KERN_ERR, "  "
 400                        "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
 401                        inode->i_sb->s_id, inode->i_ino, inode,
 402                        inode->i_mode, inode->i_nlink,
 403                        NEXT_ORPHAN(inode));
 404         }
 405 }
 406
 407 static void ext3_put_super (struct super_block * sb)
 408 {
 409         struct ext3_sb_info *sbi = EXT3_SB(sb);
 410         struct ext3_super_block *es = sbi->s_es;
 411         int i, err;
 412
 413         dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
 414         ext3_xattr_put_super(sb);
 415         err = journal_destroy(sbi->s_journal);
 416         sbi->s_journal = NULL;
 417         if (err < 0)
 418                 ext3_abort(sb, __func__, "Couldn't clean up the journal");
 419
 420         if (!(sb->s_flags & MS_RDONLY)) {
 421                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
 422                 es->s_state = cpu_to_le16(sbi->s_mount_state);
 423                 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
 424                 mark_buffer_dirty(sbi->s_sbh);
 425                 ext3_commit_super(sb, es, 1);
 426         }
 427
 428         for (i = 0; i < sbi->s_gdb_count; i++)
 429                 brelse(sbi->s_group_desc[i]);
 430         kfree(sbi->s_group_desc);
 431         percpu_counter_destroy(&sbi->s_freeblocks_counter);
 432         percpu_counter_destroy(&sbi->s_freeinodes_counter);
 433         percpu_counter_destroy(&sbi->s_dirs_counter);
 434         brelse(sbi->s_sbh);
 435 #ifdef CONFIG_QUOTA
 436         for (i = 0; i < MAXQUOTAS; i++)
 437                 kfree(sbi->s_qf_names[i]);
 438 #endif
 439
 440         /* Debugging code just in case the in-memory inode orphan list
 441          * isn't empty.  The on-disk one can be non-empty if we've
 442          * detected an error and taken the fs readonly, but the
 443          * in-memory list had better be clean by this point. */
 444         if (!list_empty(&sbi->s_orphan))
 445                 dump_orphan_list(sb, sbi);
 446         J_ASSERT(list_empty(&sbi->s_orphan));
 447
 448         invalidate_bdev(sb->s_bdev);
 449         if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
 450                 /*
 451                  * Invalidate the journal device's buffers.  We don't want them
 452                  * floating about in memory - the physical journal device may
 453                  * hotswapped, and it breaks the `ro-after' testing code.
 454                  */
 455                 sync_blockdev(sbi->journal_bdev);
 456                 invalidate_bdev(sbi->journal_bdev);
 457                 ext3_blkdev_remove(sbi);
 458         }
 459         sb->s_fs_info = NULL;
 460         kfree(sbi->s_blockgroup_lock);
 461         kfree(sbi);
 462 }
 463
 464 static struct kmem_cache *ext3_inode_cachep;
 465
 466 /*
 467  * Called inside transaction, so use GFP_NOFS
 468  */
 469 static struct inode *ext3_alloc_inode(struct super_block *sb)
 470 {
 471         struct ext3_inode_info *ei;
 472
 473         ei = kmem_cache_alloc(ext3_inode_cachep, GFP_NOFS);
 474         if (!ei)
 475                 return NULL;
 476         ei->i_block_alloc_info = NULL;
 477         ei->vfs_inode.i_version = 1;
 478         atomic_set(&ei->i_datasync_tid, 0);
 479         atomic_set(&ei->i_sync_tid, 0);
 480         return &ei->vfs_inode;
 481 }
 482
 483 static void ext3_destroy_inode(struct inode *inode)
 484 {
 485         if (!list_empty(&(EXT3_I(inode)->i_orphan))) {
 486                 printk("EXT3 Inode %p: orphan list check failed!\n",
 487                         EXT3_I(inode));
 488                 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
 489                                 EXT3_I(inode), sizeof(struct ext3_inode_info),
 490                                 false);
 491                 dump_stack();
 492         }
 493         kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
 494 }
 495
 496 static void init_once(void *foo)
 497 {
 498         struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
 499
 500         INIT_LIST_HEAD(&ei->i_orphan);
 501 #ifdef CONFIG_EXT3_FS_XATTR
 502         init_rwsem(&ei->xattr_sem);
 503 #endif
 504         mutex_init(&ei->truncate_mutex);
 505         inode_init_once(&ei->vfs_inode);
 506 }
 507
 508 static int init_inodecache(void)
 509 {
 510         ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
 511                                              sizeof(struct ext3_inode_info),
 512                                              0, (SLAB_RECLAIM_ACCOUNT|
 513                                                 SLAB_MEM_SPREAD),
 514                                              init_once);
 515         if (ext3_inode_cachep == NULL)
 516                 return -ENOMEM;
 517         return 0;
 518 }
 519
 520 static void destroy_inodecache(void)
 521 {
 522         kmem_cache_destroy(ext3_inode_cachep);
 523 }
 524
 525 static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
 526 {
 527 #if defined(CONFIG_QUOTA)
 528         struct ext3_sb_info *sbi = EXT3_SB(sb);
 529
 530         if (sbi->s_jquota_fmt) {
 531                 char *fmtname = "";
 532
 533                 switch (sbi->s_jquota_fmt) {
 534                 case QFMT_VFS_OLD:
 535                         fmtname = "vfsold";
 536                         break;
 537                 case QFMT_VFS_V0:
 538                         fmtname = "vfsv0";
 539                         break;
 540                 case QFMT_VFS_V1:
 541                         fmtname = "vfsv1";
 542                         break;
 543                 }
 544                 seq_printf(seq, ",jqfmt=%s", fmtname);
 545         }
 546
 547         if (sbi->s_qf_names[USRQUOTA])
 548                 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
 549
 550         if (sbi->s_qf_names[GRPQUOTA])
 551                 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
 552
 553         if (test_opt(sb, USRQUOTA))
 554                 seq_puts(seq, ",usrquota");
 555
 556         if (test_opt(sb, GRPQUOTA))
 557                 seq_puts(seq, ",grpquota");
 558 #endif
 559 }
 560
 561 static char *data_mode_string(unsigned long mode)
 562 {
 563         switch (mode) {
 564         case EXT3_MOUNT_JOURNAL_DATA:
 565                 return "journal";
 566         case EXT3_MOUNT_ORDERED_DATA:
 567                 return "ordered";
 568         case EXT3_MOUNT_WRITEBACK_DATA:
 569                 return "writeback";
 570         }
 571         return "unknown";
 572 }
 573
 574 /*
 575  * Show an option if
 576  *  - it's set to a non-default value OR
 577  *  - if the per-sb default is different from the global default
 578  */
 579 static int ext3_show_options(struct seq_file *seq, struct vfsmount *vfs)
 580 {
 581         struct super_block *sb = vfs->mnt_sb;
 582         struct ext3_sb_info *sbi = EXT3_SB(sb);
 583         struct ext3_super_block *es = sbi->s_es;
 584         unsigned long def_mount_opts;
 585
 586         def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
 587
 588         if (sbi->s_sb_block != 1)
 589                 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
 590         if (test_opt(sb, MINIX_DF))
 591                 seq_puts(seq, ",minixdf");
 592         if (test_opt(sb, GRPID))
 593                 seq_puts(seq, ",grpid");
 594         if (!test_opt(sb, GRPID) && (def_mount_opts & EXT3_DEFM_BSDGROUPS))
 595                 seq_puts(seq, ",nogrpid");
 596         if (sbi->s_resuid != EXT3_DEF_RESUID ||
 597             le16_to_cpu(es->s_def_resuid) != EXT3_DEF_RESUID) {
 598                 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
 599         }
 600         if (sbi->s_resgid != EXT3_DEF_RESGID ||
 601             le16_to_cpu(es->s_def_resgid) != EXT3_DEF_RESGID) {
 602                 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
 603         }
 604         if (test_opt(sb, ERRORS_RO)) {
 605                 int def_errors = le16_to_cpu(es->s_errors);
 606
 607                 if (def_errors == EXT3_ERRORS_PANIC ||
 608                     def_errors == EXT3_ERRORS_CONTINUE) {
 609                         seq_puts(seq, ",errors=remount-ro");
 610                 }
 611         }
 612         if (test_opt(sb, ERRORS_CONT))
 613                 seq_puts(seq, ",errors=continue");
 614         if (test_opt(sb, ERRORS_PANIC))
 615                 seq_puts(seq, ",errors=panic");
 616         if (test_opt(sb, NO_UID32))
 617                 seq_puts(seq, ",nouid32");
 618         if (test_opt(sb, DEBUG))
 619                 seq_puts(seq, ",debug");
 620         if (test_opt(sb, OLDALLOC))
 621                 seq_puts(seq, ",oldalloc");
 622 #ifdef CONFIG_EXT3_FS_XATTR
 623         if (test_opt(sb, XATTR_USER))
 624                 seq_puts(seq, ",user_xattr");
 625         if (!test_opt(sb, XATTR_USER) &&
 626             (def_mount_opts & EXT3_DEFM_XATTR_USER)) {
 627                 seq_puts(seq, ",nouser_xattr");
 628         }
 629 #endif
 630 #ifdef CONFIG_EXT3_FS_POSIX_ACL
 631         if (test_opt(sb, POSIX_ACL))
 632                 seq_puts(seq, ",acl");
 633         if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT3_DEFM_ACL))
 634                 seq_puts(seq, ",noacl");
 635 #endif
 636         if (!test_opt(sb, RESERVATION))
 637                 seq_puts(seq, ",noreservation");
 638         if (sbi->s_commit_interval) {
 639                 seq_printf(seq, ",commit=%u",
 640                            (unsigned) (sbi->s_commit_interval / HZ));
 641         }
 642
 643         /*
 644          * Always display barrier state so it's clear what the status is.
 645          */
 646         seq_puts(seq, ",barrier=");
 647         seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
 648         seq_printf(seq, ",data=%s", data_mode_string(test_opt(sb, DATA_FLAGS)));
 649         if (test_opt(sb, DATA_ERR_ABORT))
 650                 seq_puts(seq, ",data_err=abort");
 651
 652         if (test_opt(sb, NOLOAD))
 653                 seq_puts(seq, ",norecovery");
 654
 655         ext3_show_quota_options(seq, sb);
 656
 657         return 0;
 658 }
 659
 660
 661 static struct inode *ext3_nfs_get_inode(struct super_block *sb,
 662                 u64 ino, u32 generation)
 663 {
 664         struct inode *inode;
 665
 666         if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO)
 667                 return ERR_PTR(-ESTALE);
 668         if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count))
 669                 return ERR_PTR(-ESTALE);
 670
 671         /* iget isn't really right if the inode is currently unallocated!!
 672          *
 673          * ext3_read_inode will return a bad_inode if the inode had been
 674          * deleted, so we should be safe.
 675          *
 676          * Currently we don't know the generation for parent directory, so
 677          * a generation of 0 means "accept any"
 678          */
 679         inode = ext3_iget(sb, ino);
 680         if (IS_ERR(inode))
 681                 return ERR_CAST(inode);
 682         if (generation && inode->i_generation != generation) {
 683                 iput(inode);
 684                 return ERR_PTR(-ESTALE);
 685         }
 686
 687         return inode;
 688 }
 689
 690 static struct dentry *ext3_fh_to_dentry(struct super_block *sb, struct fid *fid,
 691                 int fh_len, int fh_type)
 692 {
 693         return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
 694                                     ext3_nfs_get_inode);
 695 }
 696
 697 static struct dentry *ext3_fh_to_parent(struct super_block *sb, struct fid *fid,
 698                 int fh_len, int fh_type)
 699 {
 700         return generic_fh_to_parent(sb, fid, fh_len, fh_type,
 701                                     ext3_nfs_get_inode);
 702 }
 703
 704 /*
 705  * Try to release metadata pages (indirect blocks, directories) which are
 706  * mapped via the block device.  Since these pages could have journal heads
 707  * which would prevent try_to_free_buffers() from freeing them, we must use
 708  * jbd layer's try_to_free_buffers() function to release them.
 709  */
 710 static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
 711                                  gfp_t wait)
 712 {
 713         journal_t *journal = EXT3_SB(sb)->s_journal;
 714
 715         WARN_ON(PageChecked(page));
 716         if (!page_has_buffers(page))
 717                 return 0;
 718         if (journal)
 719                 return journal_try_to_free_buffers(journal, page,
 720                                                    wait & ~__GFP_WAIT);
 721         return try_to_free_buffers(page);
 722 }
 723
 724 #ifdef CONFIG_QUOTA
 725 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
 726 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
 727
 728 static int ext3_write_dquot(struct dquot *dquot);
 729 static int ext3_acquire_dquot(struct dquot *dquot);
 730 static int ext3_release_dquot(struct dquot *dquot);
 731 static int ext3_mark_dquot_dirty(struct dquot *dquot);
 732 static int ext3_write_info(struct super_block *sb, int type);
 733 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
 734                                 char *path);
 735 static int ext3_quota_on_mount(struct super_block *sb, int type);
 736 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
 737                                size_t len, loff_t off);
 738 static ssize_t ext3_quota_write(struct super_block *sb, int type,
 739                                 const char *data, size_t len, loff_t off);
 740
 741 static const struct dquot_operations ext3_quota_operations = {
 742         .write_dquot    = ext3_write_dquot,
 743         .acquire_dquot  = ext3_acquire_dquot,
 744         .release_dquot  = ext3_release_dquot,
 745         .mark_dirty     = ext3_mark_dquot_dirty,
 746         .write_info     = ext3_write_info,
 747         .alloc_dquot    = dquot_alloc,
 748         .destroy_dquot  = dquot_destroy,
 749 };
 750
 751 static const struct quotactl_ops ext3_qctl_operations = {
 752         .quota_on       = ext3_quota_on,
 753         .quota_off      = dquot_quota_off,
 754         .quota_sync     = dquot_quota_sync,
 755         .get_info       = dquot_get_dqinfo,
 756         .set_info       = dquot_set_dqinfo,
 757         .get_dqblk      = dquot_get_dqblk,
 758         .set_dqblk      = dquot_set_dqblk
 759 };
 760 #endif
 761
 762 static const struct super_operations ext3_sops = {
 763         .alloc_inode    = ext3_alloc_inode,
 764         .destroy_inode  = ext3_destroy_inode,
 765         .write_inode    = ext3_write_inode,
 766         .dirty_inode    = ext3_dirty_inode,
 767         .evict_inode    = ext3_evict_inode,
 768         .put_super      = ext3_put_super,
 769         .sync_fs        = ext3_sync_fs,
 770         .freeze_fs      = ext3_freeze,
 771         .unfreeze_fs    = ext3_unfreeze,
 772         .statfs         = ext3_statfs,
 773         .remount_fs     = ext3_remount,
 774         .show_options   = ext3_show_options,
 775 #ifdef CONFIG_QUOTA
 776         .quota_read     = ext3_quota_read,
 777         .quota_write    = ext3_quota_write,
 778 #endif
 779         .bdev_try_to_free_page = bdev_try_to_free_page,
 780 };
 781
 782 static const struct export_operations ext3_export_ops = {
 783         .fh_to_dentry = ext3_fh_to_dentry,
 784         .fh_to_parent = ext3_fh_to_parent,
 785         .get_parent = ext3_get_parent,
 786 };
 787
 788 enum {
 789         Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
 790         Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
 791         Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
 792         Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
 793         Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
 794         Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
 795         Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
 796         Opt_data_err_abort, Opt_data_err_ignore,
 797         Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
 798         Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
 799         Opt_noquota, Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err,
 800         Opt_resize, Opt_usrquota, Opt_grpquota
 801 };
 802
 803 static const match_table_t tokens = {
 804         {Opt_bsd_df, "bsddf"},
 805         {Opt_minix_df, "minixdf"},
 806         {Opt_grpid, "grpid"},
 807         {Opt_grpid, "bsdgroups"},
 808         {Opt_nogrpid, "nogrpid"},
 809         {Opt_nogrpid, "sysvgroups"},
 810         {Opt_resgid, "resgid=%u"},
 811         {Opt_resuid, "resuid=%u"},
 812         {Opt_sb, "sb=%u"},
 813         {Opt_err_cont, "errors=continue"},
 814         {Opt_err_panic, "errors=panic"},
 815         {Opt_err_ro, "errors=remount-ro"},
 816         {Opt_nouid32, "nouid32"},
 817         {Opt_nocheck, "nocheck"},
 818         {Opt_nocheck, "check=none"},
 819         {Opt_debug, "debug"},
 820         {Opt_oldalloc, "oldalloc"},
 821         {Opt_orlov, "orlov"},
 822         {Opt_user_xattr, "user_xattr"},
 823         {Opt_nouser_xattr, "nouser_xattr"},
 824         {Opt_acl, "acl"},
 825         {Opt_noacl, "noacl"},
 826         {Opt_reservation, "reservation"},
 827         {Opt_noreservation, "noreservation"},
 828         {Opt_noload, "noload"},
 829         {Opt_noload, "norecovery"},
 830         {Opt_nobh, "nobh"},
 831         {Opt_bh, "bh"},
 832         {Opt_commit, "commit=%u"},
 833         {Opt_journal_update, "journal=update"},
 834         {Opt_journal_inum, "journal=%u"},
 835         {Opt_journal_dev, "journal_dev=%u"},
 836         {Opt_abort, "abort"},
 837         {Opt_data_journal, "data=journal"},
 838         {Opt_data_ordered, "data=ordered"},
 839         {Opt_data_writeback, "data=writeback"},
 840         {Opt_data_err_abort, "data_err=abort"},
 841         {Opt_data_err_ignore, "data_err=ignore"},
 842         {Opt_offusrjquota, "usrjquota="},
 843         {Opt_usrjquota, "usrjquota=%s"},
 844         {Opt_offgrpjquota, "grpjquota="},
 845         {Opt_grpjquota, "grpjquota=%s"},
 846         {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
 847         {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
 848         {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
 849         {Opt_grpquota, "grpquota"},
 850         {Opt_noquota, "noquota"},
 851         {Opt_quota, "quota"},
 852         {Opt_usrquota, "usrquota"},
 853         {Opt_barrier, "barrier=%u"},
 854         {Opt_barrier, "barrier"},
 855         {Opt_nobarrier, "nobarrier"},
 856         {Opt_resize, "resize"},
 857         {Opt_err, NULL},
 858 };
 859
 860 static ext3_fsblk_t get_sb_block(void **data, struct super_block *sb)
 861 {
 862         ext3_fsblk_t    sb_block;
 863         char            *options = (char *) *data;
 864
 865         if (!options || strncmp(options, "sb=", 3) != 0)
 866                 return 1;       /* Default location */
 867         options += 3;
 868         /*todo: use simple_strtoll with >32bit ext3 */
 869         sb_block = simple_strtoul(options, &options, 0);
 870         if (*options && *options != ',') {
 871                 ext3_msg(sb, "error: invalid sb specification: %s",
 872                        (char *) *data);
 873                 return 1;
 874         }
 875         if (*options == ',')
 876                 options++;
 877         *data = (void *) options;
 878         return sb_block;
 879 }
 880
 881 #ifdef CONFIG_QUOTA
 882 static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
 883 {
 884         struct ext3_sb_info *sbi = EXT3_SB(sb);
 885         char *qname;
 886
 887         if (sb_any_quota_loaded(sb) &&
 888                 !sbi->s_qf_names[qtype]) {
 889                 ext3_msg(sb, KERN_ERR,
 890                         "Cannot change journaled "
 891                         "quota options when quota turned on");
 892                 return 0;
 893         }
 894         qname = match_strdup(args);
 895         if (!qname) {
 896                 ext3_msg(sb, KERN_ERR,
 897                         "Not enough memory for storing quotafile name");
 898                 return 0;
 899         }
 900         if (sbi->s_qf_names[qtype] &&
 901                 strcmp(sbi->s_qf_names[qtype], qname)) {
 902                 ext3_msg(sb, KERN_ERR,
 903                         "%s quota file already specified", QTYPE2NAME(qtype));
 904                 kfree(qname);
 905                 return 0;
 906         }
 907         sbi->s_qf_names[qtype] = qname;
 908         if (strchr(sbi->s_qf_names[qtype], '/')) {
 909                 ext3_msg(sb, KERN_ERR,
 910                         "quotafile must be on filesystem root");
 911                 kfree(sbi->s_qf_names[qtype]);
 912                 sbi->s_qf_names[qtype] = NULL;
 913                 return 0;
 914         }
 915         set_opt(sbi->s_mount_opt, QUOTA);
 916         return 1;
 917 }
 918
 919 static int clear_qf_name(struct super_block *sb, int qtype) {
 920
 921         struct ext3_sb_info *sbi = EXT3_SB(sb);
 922
 923         if (sb_any_quota_loaded(sb) &&
 924                 sbi->s_qf_names[qtype]) {
 925                 ext3_msg(sb, KERN_ERR, "Cannot change journaled quota options"
 926                         " when quota turned on");
 927                 return 0;
 928         }
 929         /*
 930          * The space will be released later when all options are confirmed
 931          * to be correct
 932          */
 933         sbi->s_qf_names[qtype] = NULL;
 934         return 1;
 935 }
 936 #endif
 937
 938 static int parse_options (char *options, struct super_block *sb,
 939                           unsigned int *inum, unsigned long *journal_devnum,
 940                           ext3_fsblk_t *n_blocks_count, int is_remount)
 941 {
 942         struct ext3_sb_info *sbi = EXT3_SB(sb);
 943         char * p;
 944         substring_t args[MAX_OPT_ARGS];
 945         int data_opt = 0;
 946         int option;
 947 #ifdef CONFIG_QUOTA
 948         int qfmt;
 949 #endif
 950
 951         if (!options)
 952                 return 1;
 953
 954         while ((p = strsep (&options, ",")) != NULL) {
 955                 int token;
 956                 if (!*p)
 957                         continue;
 958                 /*
 959                  * Initialize args struct so we know whether arg was
 960                  * found; some options take optional arguments.
 961                  */
 962                 args[0].to = args[0].from = 0;
 963                 token = match_token(p, tokens, args);
 964                 switch (token) {
 965                 case Opt_bsd_df:
 966                         clear_opt (sbi->s_mount_opt, MINIX_DF);
 967                         break;
 968                 case Opt_minix_df:
 969                         set_opt (sbi->s_mount_opt, MINIX_DF);
 970                         break;
 971                 case Opt_grpid:
 972                         set_opt (sbi->s_mount_opt, GRPID);
 973                         break;
 974                 case Opt_nogrpid:
 975                         clear_opt (sbi->s_mount_opt, GRPID);
 976                         break;
 977                 case Opt_resuid:
 978                         if (match_int(&args[0], &option))
 979                                 return 0;
 980                         sbi->s_resuid = option;
 981                         break;
 982                 case Opt_resgid:
 983                         if (match_int(&args[0], &option))
 984                                 return 0;
 985                         sbi->s_resgid = option;
 986                         break;
 987                 case Opt_sb:
 988                         /* handled by get_sb_block() instead of here */
 989                         /* *sb_block = match_int(&args[0]); */
 990                         break;
 991                 case Opt_err_panic:
 992                         clear_opt (sbi->s_mount_opt, ERRORS_CONT);
 993                         clear_opt (sbi->s_mount_opt, ERRORS_RO);
 994                         set_opt (sbi->s_mount_opt, ERRORS_PANIC);
 995                         break;
 996                 case Opt_err_ro:
 997                         clear_opt (sbi->s_mount_opt, ERRORS_CONT);
 998                         clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
 999                         set_opt (sbi->s_mount_opt, ERRORS_RO);
1000                         break;
1001                 case Opt_err_cont:
1002                         clear_opt (sbi->s_mount_opt, ERRORS_RO);
1003                         clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1004                         set_opt (sbi->s_mount_opt, ERRORS_CONT);
1005                         break;
1006                 case Opt_nouid32:
1007                         set_opt (sbi->s_mount_opt, NO_UID32);
1008                         break;
1009                 case Opt_nocheck:
1010                         clear_opt (sbi->s_mount_opt, CHECK);
1011                         break;
1012                 case Opt_debug:
1013                         set_opt (sbi->s_mount_opt, DEBUG);
1014                         break;
1015                 case Opt_oldalloc:
1016                         set_opt (sbi->s_mount_opt, OLDALLOC);
1017                         break;
1018                 case Opt_orlov:
1019                         clear_opt (sbi->s_mount_opt, OLDALLOC);
1020                         break;
1021 #ifdef CONFIG_EXT3_FS_XATTR
1022                 case Opt_user_xattr:
1023                         set_opt (sbi->s_mount_opt, XATTR_USER);
1024                         break;
1025                 case Opt_nouser_xattr:
1026                         clear_opt (sbi->s_mount_opt, XATTR_USER);
1027                         break;
1028 #else
1029                 case Opt_user_xattr:
1030                 case Opt_nouser_xattr:
1031                         ext3_msg(sb, KERN_INFO,
1032                                 "(no)user_xattr options not supported");
1033                         break;
1034 #endif
1035 #ifdef CONFIG_EXT3_FS_POSIX_ACL
1036                 case Opt_acl:
1037                         set_opt(sbi->s_mount_opt, POSIX_ACL);
1038                         break;
1039                 case Opt_noacl:
1040                         clear_opt(sbi->s_mount_opt, POSIX_ACL);
1041                         break;
1042 #else
1043                 case Opt_acl:
1044                 case Opt_noacl:
1045                         ext3_msg(sb, KERN_INFO,
1046                                 "(no)acl options not supported");
1047                         break;
1048 #endif
1049                 case Opt_reservation:
1050                         set_opt(sbi->s_mount_opt, RESERVATION);
1051                         break;
1052                 case Opt_noreservation:
1053                         clear_opt(sbi->s_mount_opt, RESERVATION);
1054                         break;
1055                 case Opt_journal_update:
1056                         /* @@@ FIXME */
1057                         /* Eventually we will want to be able to create
1058                            a journal file here.  For now, only allow the
1059                            user to specify an existing inode to be the
1060                            journal file. */
1061                         if (is_remount) {
1062                                 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1063                                         "journal on remount");
1064                                 return 0;
1065                         }
1066                         set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
1067                         break;
1068                 case Opt_journal_inum:
1069                         if (is_remount) {
1070                                 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1071                                        "journal on remount");
1072                                 return 0;
1073                         }
1074                         if (match_int(&args[0], &option))
1075                                 return 0;
1076                         *inum = option;
1077                         break;
1078                 case Opt_journal_dev:
1079                         if (is_remount) {
1080                                 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1081                                        "journal on remount");
1082                                 return 0;
1083                         }
1084                         if (match_int(&args[0], &option))
1085                                 return 0;
1086                         *journal_devnum = option;
1087                         break;
1088                 case Opt_noload:
1089                         set_opt (sbi->s_mount_opt, NOLOAD);
1090                         break;
1091                 case Opt_commit:
1092                         if (match_int(&args[0], &option))
1093                                 return 0;
1094                         if (option < 0)
1095                                 return 0;
1096                         if (option == 0)
1097                                 option = JBD_DEFAULT_MAX_COMMIT_AGE;
1098                         sbi->s_commit_interval = HZ * option;
1099                         break;
1100                 case Opt_data_journal:
1101                         data_opt = EXT3_MOUNT_JOURNAL_DATA;
1102                         goto datacheck;
1103                 case Opt_data_ordered:
1104                         data_opt = EXT3_MOUNT_ORDERED_DATA;
1105                         goto datacheck;
1106                 case Opt_data_writeback:
1107                         data_opt = EXT3_MOUNT_WRITEBACK_DATA;
1108                 datacheck:
1109                         if (is_remount) {
1110                                 if (test_opt(sb, DATA_FLAGS) == data_opt)
1111                                         break;
1112                                 ext3_msg(sb, KERN_ERR,
1113                                         "error: cannot change "
1114                                         "data mode on remount. The filesystem "
1115                                         "is mounted in data=%s mode and you "
1116                                         "try to remount it in data=%s mode.",
1117                                         data_mode_string(test_opt(sb,
1118                                                         DATA_FLAGS)),
1119                                         data_mode_string(data_opt));
1120                                 return 0;
1121                         } else {
1122                                 clear_opt(sbi->s_mount_opt, DATA_FLAGS);
1123                                 sbi->s_mount_opt |= data_opt;
1124                         }
1125                         break;
1126                 case Opt_data_err_abort:
1127                         set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1128                         break;
1129                 case Opt_data_err_ignore:
1130                         clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1131                         break;
1132 #ifdef CONFIG_QUOTA
1133                 case Opt_usrjquota:
1134                         if (!set_qf_name(sb, USRQUOTA, &args[0]))
1135                                 return 0;
1136                         break;
1137                 case Opt_grpjquota:
1138                         if (!set_qf_name(sb, GRPQUOTA, &args[0]))
1139                                 return 0;
1140                         break;
1141                 case Opt_offusrjquota:
1142                         if (!clear_qf_name(sb, USRQUOTA))
1143                                 return 0;
1144                         break;
1145                 case Opt_offgrpjquota:
1146                         if (!clear_qf_name(sb, GRPQUOTA))
1147                                 return 0;
1148                         break;
1149                 case Opt_jqfmt_vfsold:
1150                         qfmt = QFMT_VFS_OLD;
1151                         goto set_qf_format;
1152                 case Opt_jqfmt_vfsv0:
1153                         qfmt = QFMT_VFS_V0;
1154                         goto set_qf_format;
1155                 case Opt_jqfmt_vfsv1:
1156                         qfmt = QFMT_VFS_V1;
1157 set_qf_format:
1158                         if (sb_any_quota_loaded(sb) &&
1159                             sbi->s_jquota_fmt != qfmt) {
1160                                 ext3_msg(sb, KERN_ERR, "error: cannot change "
1161                                         "journaled quota options when "
1162                                         "quota turned on.");
1163                                 return 0;
1164                         }
1165                         sbi->s_jquota_fmt = qfmt;
1166                         break;
1167                 case Opt_quota:
1168                 case Opt_usrquota:
1169                         set_opt(sbi->s_mount_opt, QUOTA);
1170                         set_opt(sbi->s_mount_opt, USRQUOTA);
1171                         break;
1172                 case Opt_grpquota:
1173                         set_opt(sbi->s_mount_opt, QUOTA);
1174                         set_opt(sbi->s_mount_opt, GRPQUOTA);
1175                         break;
1176                 case Opt_noquota:
1177                         if (sb_any_quota_loaded(sb)) {
1178                                 ext3_msg(sb, KERN_ERR, "error: cannot change "
1179                                         "quota options when quota turned on.");
1180                                 return 0;
1181                         }
1182                         clear_opt(sbi->s_mount_opt, QUOTA);
1183                         clear_opt(sbi->s_mount_opt, USRQUOTA);
1184                         clear_opt(sbi->s_mount_opt, GRPQUOTA);
1185                         break;
1186 #else
1187                 case Opt_quota:
1188                 case Opt_usrquota:
1189                 case Opt_grpquota:
1190                         ext3_msg(sb, KERN_ERR,
1191                                 "error: quota options not supported.");
1192                         break;
1193                 case Opt_usrjquota:
1194                 case Opt_grpjquota:
1195                 case Opt_offusrjquota:
1196                 case Opt_offgrpjquota:
1197                 case Opt_jqfmt_vfsold:
1198                 case Opt_jqfmt_vfsv0:
1199                 case Opt_jqfmt_vfsv1:
1200                         ext3_msg(sb, KERN_ERR,
1201                                 "error: journaled quota options not "
1202                                 "supported.");
1203                         break;
1204                 case Opt_noquota:
1205                         break;
1206 #endif
1207                 case Opt_abort:
1208                         set_opt(sbi->s_mount_opt, ABORT);
1209                         break;
1210                 case Opt_nobarrier:
1211                         clear_opt(sbi->s_mount_opt, BARRIER);
1212                         break;
1213                 case Opt_barrier:
1214                         if (args[0].from) {
1215                                 if (match_int(&args[0], &option))
1216                                         return 0;
1217                         } else
1218                                 option = 1;     /* No argument, default to 1 */
1219                         if (option)
1220                                 set_opt(sbi->s_mount_opt, BARRIER);
1221                         else
1222                                 clear_opt(sbi->s_mount_opt, BARRIER);
1223                         break;
1224                 case Opt_ignore:
1225                         break;
1226                 case Opt_resize:
1227                         if (!is_remount) {
1228                                 ext3_msg(sb, KERN_ERR,
1229                                         "error: resize option only available "
1230                                         "for remount");
1231                                 return 0;
1232                         }
1233                         if (match_int(&args[0], &option) != 0)
1234                                 return 0;
1235                         *n_blocks_count = option;
1236                         break;
1237                 case Opt_nobh:
1238                         ext3_msg(sb, KERN_WARNING,
1239                                 "warning: ignoring deprecated nobh option");
1240                         break;
1241                 case Opt_bh:
1242                         ext3_msg(sb, KERN_WARNING,
1243                                 "warning: ignoring deprecated bh option");
1244                         break;
1245                 default:
1246                         ext3_msg(sb, KERN_ERR,
1247                                 "error: unrecognized mount option \"%s\" "
1248                                 "or missing value", p);
1249                         return 0;
1250                 }
1251         }
1252 #ifdef CONFIG_QUOTA
1253         if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1254                 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
1255                         clear_opt(sbi->s_mount_opt, USRQUOTA);
1256                 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
1257                         clear_opt(sbi->s_mount_opt, GRPQUOTA);
1258
1259                 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
1260                         ext3_msg(sb, KERN_ERR, "error: old and new quota "
1261                                         "format mixing.");
1262                         return 0;
1263                 }
1264
1265                 if (!sbi->s_jquota_fmt) {
1266                         ext3_msg(sb, KERN_ERR, "error: journaled quota format "
1267                                         "not specified.");
1268                         return 0;
1269                 }
1270         } else {
1271                 if (sbi->s_jquota_fmt) {
1272                         ext3_msg(sb, KERN_ERR, "error: journaled quota format "
1273                                         "specified with no journaling "
1274                                         "enabled.");
1275                         return 0;
1276                 }
1277         }
1278 #endif
1279         return 1;
1280 }
1281
1282 static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1283                             int read_only)
1284 {
1285         struct ext3_sb_info *sbi = EXT3_SB(sb);
1286         int res = 0;
1287
1288         if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
1289                 ext3_msg(sb, KERN_ERR,
1290                         "error: revision level too high, "
1291                         "forcing read-only mode");
1292                 res = MS_RDONLY;
1293         }
1294         if (read_only)
1295                 return res;
1296         if (!(sbi->s_mount_state & EXT3_VALID_FS))
1297                 ext3_msg(sb, KERN_WARNING,
1298                         "warning: mounting unchecked fs, "
1299                         "running e2fsck is recommended");
1300         else if ((sbi->s_mount_state & EXT3_ERROR_FS))
1301                 ext3_msg(sb, KERN_WARNING,
1302                         "warning: mounting fs with errors, "
1303                         "running e2fsck is recommended");
1304         else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1305                  le16_to_cpu(es->s_mnt_count) >=
1306                  (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1307                 ext3_msg(sb, KERN_WARNING,
1308                         "warning: maximal mount count reached, "
1309                         "running e2fsck is recommended");
1310         else if (le32_to_cpu(es->s_checkinterval) &&
1311                 (le32_to_cpu(es->s_lastcheck) +
1312                         le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1313                 ext3_msg(sb, KERN_WARNING,
1314                         "warning: checktime reached, "
1315                         "running e2fsck is recommended");
1316 #if 0
1317                 /* @@@ We _will_ want to clear the valid bit if we find
1318                    inconsistencies, to force a fsck at reboot.  But for
1319                    a plain journaled filesystem we can keep it set as
1320                    valid forever! :) */
1321         es->s_state &= cpu_to_le16(~EXT3_VALID_FS);
1322 #endif
1323         if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1324                 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
1325         le16_add_cpu(&es->s_mnt_count, 1);
1326         es->s_mtime = cpu_to_le32(get_seconds());
1327         ext3_update_dynamic_rev(sb);
1328         EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1329
1330         ext3_commit_super(sb, es, 1);
1331         if (test_opt(sb, DEBUG))
1332                 ext3_msg(sb, KERN_INFO, "[bs=%lu, gc=%lu, "
1333                                 "bpg=%lu, ipg=%lu, mo=%04lx]",
1334                         sb->s_blocksize,
1335                         sbi->s_groups_count,
1336                         EXT3_BLOCKS_PER_GROUP(sb),
1337                         EXT3_INODES_PER_GROUP(sb),
1338                         sbi->s_mount_opt);
1339
1340         if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1341                 char b[BDEVNAME_SIZE];
1342                 ext3_msg(sb, KERN_INFO, "using external journal on %s",
1343                         bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1344         } else {
1345                 ext3_msg(sb, KERN_INFO, "using internal journal");
1346         }
1347         return res;
1348 }
1349
1350 /* Called at mount-time, super-block is locked */
1351 static int ext3_check_descriptors(struct super_block *sb)
1352 {
1353         struct ext3_sb_info *sbi = EXT3_SB(sb);
1354         int i;
1355
1356         ext3_debug ("Checking group descriptors");
1357
1358         for (i = 0; i < sbi->s_groups_count; i++) {
1359                 struct ext3_group_desc *gdp = ext3_get_group_desc(sb, i, NULL);
1360                 ext3_fsblk_t first_block = ext3_group_first_block_no(sb, i);
1361                 ext3_fsblk_t last_block;
1362
1363                 if (i == sbi->s_groups_count - 1)
1364                         last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
1365                 else
1366                         last_block = first_block +
1367                                 (EXT3_BLOCKS_PER_GROUP(sb) - 1);
1368
1369                 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
1370                     le32_to_cpu(gdp->bg_block_bitmap) > last_block)
1371                 {
1372                         ext3_error (sb, "ext3_check_descriptors",
1373                                     "Block bitmap for group %d"
1374                                     " not in group (block %lu)!",
1375                                     i, (unsigned long)
1376                                         le32_to_cpu(gdp->bg_block_bitmap));
1377                         return 0;
1378                 }
1379                 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
1380                     le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
1381                 {
1382                         ext3_error (sb, "ext3_check_descriptors",
1383                                     "Inode bitmap for group %d"
1384                                     " not in group (block %lu)!",
1385                                     i, (unsigned long)
1386                                         le32_to_cpu(gdp->bg_inode_bitmap));
1387                         return 0;
1388                 }
1389                 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
1390                     le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
1391                     last_block)
1392                 {
1393                         ext3_error (sb, "ext3_check_descriptors",
1394                                     "Inode table for group %d"
1395                                     " not in group (block %lu)!",
1396                                     i, (unsigned long)
1397                                         le32_to_cpu(gdp->bg_inode_table));
1398                         return 0;
1399                 }
1400         }
1401
1402         sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1403         sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1404         return 1;
1405 }
1406
1407
1408 /* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1409  * the superblock) which were deleted from all directories, but held open by
1410  * a process at the time of a crash.  We walk the list and try to delete these
1411  * inodes at recovery time (only with a read-write filesystem).
1412  *
1413  * In order to keep the orphan inode chain consistent during traversal (in
1414  * case of crash during recovery), we link each inode into the superblock
1415  * orphan list_head and handle it the same way as an inode deletion during
1416  * normal operation (which journals the operations for us).
1417  *
1418  * We only do an iget() and an iput() on each inode, which is very safe if we
1419  * accidentally point at an in-use or already deleted inode.  The worst that
1420  * can happen in this case is that we get a "bit already cleared" message from
1421  * ext3_free_inode().  The only reason we would point at a wrong inode is if
1422  * e2fsck was run on this filesystem, and it must have already done the orphan
1423  * inode cleanup for us, so we can safely abort without any further action.
1424  */
1425 static void ext3_orphan_cleanup (struct super_block * sb,
1426                                  struct ext3_super_block * es)
1427 {
1428         unsigned int s_flags = sb->s_flags;
1429         int nr_orphans = 0, nr_truncates = 0;
1430 #ifdef CONFIG_QUOTA
1431         int i;
1432 #endif
1433         if (!es->s_last_orphan) {
1434                 jbd_debug(4, "no orphan inodes to clean up\n");
1435                 return;
1436         }
1437
1438         if (bdev_read_only(sb->s_bdev)) {
1439                 ext3_msg(sb, KERN_ERR, "error: write access "
1440                         "unavailable, skipping orphan cleanup.");
1441                 return;
1442         }
1443
1444         if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1445                 if (es->s_last_orphan)
1446                         jbd_debug(1, "Errors on filesystem, "
1447                                   "clearing orphan list.\n");
1448                 es->s_last_orphan = 0;
1449                 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1450                 return;
1451         }
1452
1453         if (s_flags & MS_RDONLY) {
1454                 ext3_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
1455                 sb->s_flags &= ~MS_RDONLY;
1456         }
1457 #ifdef CONFIG_QUOTA
1458         /* Needed for iput() to work correctly and not trash data */
1459         sb->s_flags |= MS_ACTIVE;
1460         /* Turn on quotas so that they are updated correctly */
1461         for (i = 0; i < MAXQUOTAS; i++) {
1462                 if (EXT3_SB(sb)->s_qf_names[i]) {
1463                         int ret = ext3_quota_on_mount(sb, i);
1464                         if (ret < 0)
1465                                 ext3_msg(sb, KERN_ERR,
1466                                         "error: cannot turn on journaled "
1467                                         "quota: %d", ret);
1468                 }
1469         }
1470 #endif
1471
1472         while (es->s_last_orphan) {
1473                 struct inode *inode;
1474
1475                 inode = ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1476                 if (IS_ERR(inode)) {
1477                         es->s_last_orphan = 0;
1478                         break;
1479                 }
1480
1481                 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1482                 dquot_initialize(inode);
1483                 if (inode->i_nlink) {
1484                         printk(KERN_DEBUG
1485                                 "%s: truncating inode %lu to %Ld bytes\n",
1486                                 __func__, inode->i_ino, inode->i_size);
1487                         jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1488                                   inode->i_ino, inode->i_size);
1489                         ext3_truncate(inode);
1490                         nr_truncates++;
1491                 } else {
1492                         printk(KERN_DEBUG
1493                                 "%s: deleting unreferenced inode %lu\n",
1494                                 __func__, inode->i_ino);
1495                         jbd_debug(2, "deleting unreferenced inode %lu\n",
1496                                   inode->i_ino);
1497                         nr_orphans++;
1498                 }
1499                 iput(inode);  /* The delete magic happens here! */
1500         }
1501
1502 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1503
1504         if (nr_orphans)
1505                 ext3_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
1506                        PLURAL(nr_orphans));
1507         if (nr_truncates)
1508                 ext3_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
1509                        PLURAL(nr_truncates));
1510 #ifdef CONFIG_QUOTA
1511         /* Turn quotas off */
1512         for (i = 0; i < MAXQUOTAS; i++) {
1513                 if (sb_dqopt(sb)->files[i])
1514                         dquot_quota_off(sb, i);
1515         }
1516 #endif
1517         sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1518 }
1519
1520 /*
1521  * Maximal file size.  There is a direct, and {,double-,triple-}indirect
1522  * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1523  * We need to be 1 filesystem block less than the 2^32 sector limit.
1524  */
1525 static loff_t ext3_max_size(int bits)
1526 {
1527         loff_t res = EXT3_NDIR_BLOCKS;
1528         int meta_blocks;
1529         loff_t upper_limit;
1530
1531         /* This is calculated to be the largest file size for a
1532          * dense, file such that the total number of
1533          * sectors in the file, including data and all indirect blocks,
1534          * does not exceed 2^32 -1
1535          * __u32 i_blocks representing the total number of
1536          * 512 bytes blocks of the file
1537          */
1538         upper_limit = (1LL << 32) - 1;
1539
1540         /* total blocks in file system block size */
1541         upper_limit >>= (bits - 9);
1542
1543
1544         /* indirect blocks */
1545         meta_blocks = 1;
1546         /* double indirect blocks */
1547         meta_blocks += 1 + (1LL << (bits-2));
1548         /* tripple indirect blocks */
1549         meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1550
1551         upper_limit -= meta_blocks;
1552         upper_limit <<= bits;
1553
1554         res += 1LL << (bits-2);
1555         res += 1LL << (2*(bits-2));
1556         res += 1LL << (3*(bits-2));
1557         res <<= bits;
1558         if (res > upper_limit)
1559                 res = upper_limit;
1560
1561         if (res > MAX_LFS_FILESIZE)
1562                 res = MAX_LFS_FILESIZE;
1563
1564         return res;
1565 }
1566
1567 static ext3_fsblk_t descriptor_loc(struct super_block *sb,
1568                                     ext3_fsblk_t logic_sb_block,
1569                                     int nr)
1570 {
1571         struct ext3_sb_info *sbi = EXT3_SB(sb);
1572         unsigned long bg, first_meta_bg;
1573         int has_super = 0;
1574
1575         first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1576
1577         if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1578             nr < first_meta_bg)
1579                 return (logic_sb_block + nr + 1);
1580         bg = sbi->s_desc_per_block * nr;
1581         if (ext3_bg_has_super(sb, bg))
1582                 has_super = 1;
1583         return (has_super + ext3_group_first_block_no(sb, bg));
1584 }
1585
1586
1587 static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1588 {
1589         struct buffer_head * bh;
1590         struct ext3_super_block *es = NULL;
1591         struct ext3_sb_info *sbi;
1592         ext3_fsblk_t block;
1593         ext3_fsblk_t sb_block = get_sb_block(&data, sb);
1594         ext3_fsblk_t logic_sb_block;
1595         unsigned long offset = 0;
1596         unsigned int journal_inum = 0;
1597         unsigned long journal_devnum = 0;
1598         unsigned long def_mount_opts;
1599         struct inode *root;
1600         int blocksize;
1601         int hblock;
1602         int db_count;
1603         int i;
1604         int needs_recovery;
1605         int ret = -EINVAL;
1606         __le32 features;
1607         int err;
1608
1609         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1610         if (!sbi)
1611                 return -ENOMEM;
1612
1613         sbi->s_blockgroup_lock =
1614                 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
1615         if (!sbi->s_blockgroup_lock) {
1616                 kfree(sbi);
1617                 return -ENOMEM;
1618         }
1619         sb->s_fs_info = sbi;
1620         sbi->s_mount_opt = 0;
1621         sbi->s_resuid = EXT3_DEF_RESUID;
1622         sbi->s_resgid = EXT3_DEF_RESGID;
1623         sbi->s_sb_block = sb_block;
1624
1625         blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1626         if (!blocksize) {
1627                 ext3_msg(sb, KERN_ERR, "error: unable to set blocksize");
1628                 goto out_fail;
1629         }
1630
1631         /*
1632          * The ext3 superblock will not be buffer aligned for other than 1kB
1633          * block sizes.  We need to calculate the offset from buffer start.
1634          */
1635         if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1636                 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1637                 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1638         } else {
1639                 logic_sb_block = sb_block;
1640         }
1641
1642         if (!(bh = sb_bread(sb, logic_sb_block))) {
1643                 ext3_msg(sb, KERN_ERR, "error: unable to read superblock");
1644                 goto out_fail;
1645         }
1646         /*
1647          * Note: s_es must be initialized as soon as possible because
1648          *       some ext3 macro-instructions depend on its value
1649          */
1650         es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1651         sbi->s_es = es;
1652         sb->s_magic = le16_to_cpu(es->s_magic);
1653         if (sb->s_magic != EXT3_SUPER_MAGIC)
1654                 goto cantfind_ext3;
1655
1656         /* Set defaults before we parse the mount options */
1657         def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1658         if (def_mount_opts & EXT3_DEFM_DEBUG)
1659                 set_opt(sbi->s_mount_opt, DEBUG);
1660         if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1661                 set_opt(sbi->s_mount_opt, GRPID);
1662         if (def_mount_opts & EXT3_DEFM_UID16)
1663                 set_opt(sbi->s_mount_opt, NO_UID32);
1664 #ifdef CONFIG_EXT3_FS_XATTR
1665         if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1666                 set_opt(sbi->s_mount_opt, XATTR_USER);
1667 #endif
1668 #ifdef CONFIG_EXT3_FS_POSIX_ACL
1669         if (def_mount_opts & EXT3_DEFM_ACL)
1670                 set_opt(sbi->s_mount_opt, POSIX_ACL);
1671 #endif
1672         if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1673                 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1674         else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1675                 set_opt(sbi->s_mount_opt, ORDERED_DATA);
1676         else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1677                 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
1678
1679         if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1680                 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1681         else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_CONTINUE)
1682                 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1683         else
1684                 set_opt(sbi->s_mount_opt, ERRORS_RO);
1685
1686         sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1687         sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1688
1689         set_opt(sbi->s_mount_opt, RESERVATION);
1690
1691         if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1692                             NULL, 0))
1693                 goto failed_mount;
1694
1695         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1696                 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
1697
1698         if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1699             (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1700              EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1701              EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1702                 ext3_msg(sb, KERN_WARNING,
1703                         "warning: feature flags set on rev 0 fs, "
1704                         "running e2fsck is recommended");
1705         /*
1706          * Check feature flags regardless of the revision level, since we
1707          * previously didn't change the revision level when setting the flags,
1708          * so there is a chance incompat flags are set on a rev 0 filesystem.
1709          */
1710         features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1711         if (features) {
1712                 ext3_msg(sb, KERN_ERR,
1713                         "error: couldn't mount because of unsupported "
1714                         "optional features (%x)", le32_to_cpu(features));
1715                 goto failed_mount;
1716         }
1717         features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1718         if (!(sb->s_flags & MS_RDONLY) && features) {
1719                 ext3_msg(sb, KERN_ERR,
1720                         "error: couldn't mount RDWR because of unsupported "
1721                         "optional features (%x)", le32_to_cpu(features));
1722                 goto failed_mount;
1723         }
1724         blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1725
1726         if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1727             blocksize > EXT3_MAX_BLOCK_SIZE) {
1728                 ext3_msg(sb, KERN_ERR,
1729                         "error: couldn't mount because of unsupported "
1730                         "filesystem blocksize %d", blocksize);
1731                 goto failed_mount;
1732         }
1733
1734         hblock = bdev_logical_block_size(sb->s_bdev);
1735         if (sb->s_blocksize != blocksize) {
1736                 /*
1737                  * Make sure the blocksize for the filesystem is larger
1738                  * than the hardware sectorsize for the machine.
1739                  */
1740                 if (blocksize < hblock) {
1741                         ext3_msg(sb, KERN_ERR,
1742                                 "error: fsblocksize %d too small for "
1743                                 "hardware sectorsize %d", blocksize, hblock);
1744                         goto failed_mount;
1745                 }
1746
1747                 brelse (bh);
1748                 if (!sb_set_blocksize(sb, blocksize)) {
1749                         ext3_msg(sb, KERN_ERR,
1750                                 "error: bad blocksize %d", blocksize);
1751                         goto out_fail;
1752                 }
1753                 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1754                 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1755                 bh = sb_bread(sb, logic_sb_block);
1756                 if (!bh) {
1757                         ext3_msg(sb, KERN_ERR,
1758                                "error: can't read superblock on 2nd try");
1759                         goto failed_mount;
1760                 }
1761                 es = (struct ext3_super_block *)(((char *)bh->b_data) + offset);
1762                 sbi->s_es = es;
1763                 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
1764                         ext3_msg(sb, KERN_ERR,
1765                                 "error: magic mismatch");
1766                         goto failed_mount;
1767                 }
1768         }
1769
1770         sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1771
1772         if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1773                 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1774                 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1775         } else {
1776                 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1777                 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1778                 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
1779                     (!is_power_of_2(sbi->s_inode_size)) ||
1780                     (sbi->s_inode_size > blocksize)) {
1781                         ext3_msg(sb, KERN_ERR,
1782                                 "error: unsupported inode size: %d",
1783                                 sbi->s_inode_size);
1784                         goto failed_mount;
1785                 }
1786         }
1787         sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1788                                    le32_to_cpu(es->s_log_frag_size);
1789         if (blocksize != sbi->s_frag_size) {
1790                 ext3_msg(sb, KERN_ERR,
1791                        "error: fragsize %lu != blocksize %u (unsupported)",
1792                        sbi->s_frag_size, blocksize);
1793                 goto failed_mount;
1794         }
1795         sbi->s_frags_per_block = 1;
1796         sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1797         sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1798         sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1799         if (EXT3_INODE_SIZE(sb) == 0 || EXT3_INODES_PER_GROUP(sb) == 0)
1800                 goto cantfind_ext3;
1801         sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1802         if (sbi->s_inodes_per_block == 0)
1803                 goto cantfind_ext3;
1804         sbi->s_itb_per_group = sbi->s_inodes_per_group /
1805                                         sbi->s_inodes_per_block;
1806         sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1807         sbi->s_sbh = bh;
1808         sbi->s_mount_state = le16_to_cpu(es->s_state);
1809         sbi->s_addr_per_block_bits = ilog2(EXT3_ADDR_PER_BLOCK(sb));
1810         sbi->s_desc_per_block_bits = ilog2(EXT3_DESC_PER_BLOCK(sb));
1811         for (i=0; i < 4; i++)
1812                 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1813         sbi->s_def_hash_version = es->s_def_hash_version;
1814         i = le32_to_cpu(es->s_flags);
1815         if (i & EXT2_FLAGS_UNSIGNED_HASH)
1816                 sbi->s_hash_unsigned = 3;
1817         else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
1818 #ifdef __CHAR_UNSIGNED__
1819                 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
1820                 sbi->s_hash_unsigned = 3;
1821 #else
1822                 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
1823 #endif
1824         }
1825
1826         if (sbi->s_blocks_per_group > blocksize * 8) {
1827                 ext3_msg(sb, KERN_ERR,
1828                         "#blocks per group too big: %lu",
1829                         sbi->s_blocks_per_group);
1830                 goto failed_mount;
1831         }
1832         if (sbi->s_frags_per_group > blocksize * 8) {
1833                 ext3_msg(sb, KERN_ERR,
1834                         "error: #fragments per group too big: %lu",
1835                         sbi->s_frags_per_group);
1836                 goto failed_mount;
1837         }
1838         if (sbi->s_inodes_per_group > blocksize * 8) {
1839                 ext3_msg(sb, KERN_ERR,
1840                         "error: #inodes per group too big: %lu",
1841                         sbi->s_inodes_per_group);
1842                 goto failed_mount;
1843         }
1844
1845         if (generic_check_addressable(sb->s_blocksize_bits,
1846                                       le32_to_cpu(es->s_blocks_count))) {
1847                 ext3_msg(sb, KERN_ERR,
1848                         "error: filesystem is too large to mount safely");
1849                 if (sizeof(sector_t) < 8)
1850                         ext3_msg(sb, KERN_ERR,
1851                                 "error: CONFIG_LBDAF not enabled");
1852                 goto failed_mount;
1853         }
1854
1855         if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1856                 goto cantfind_ext3;
1857         sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1858                                le32_to_cpu(es->s_first_data_block) - 1)
1859                                        / EXT3_BLOCKS_PER_GROUP(sb)) + 1;
1860         db_count = (sbi->s_groups_count + EXT3_DESC_PER_BLOCK(sb) - 1) /
1861                    EXT3_DESC_PER_BLOCK(sb);
1862         sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1863                                     GFP_KERNEL);
1864         if (sbi->s_group_desc == NULL) {
1865                 ext3_msg(sb, KERN_ERR,
1866                         "error: not enough memory");
1867                 goto failed_mount;
1868         }
1869
1870         bgl_lock_init(sbi->s_blockgroup_lock);
1871
1872         for (i = 0; i < db_count; i++) {
1873                 block = descriptor_loc(sb, logic_sb_block, i);
1874                 sbi->s_group_desc[i] = sb_bread(sb, block);
1875                 if (!sbi->s_group_desc[i]) {
1876                         ext3_msg(sb, KERN_ERR,
1877                                 "error: can't read group descriptor %d", i);
1878                         db_count = i;
1879                         goto failed_mount2;
1880                 }
1881         }
1882         if (!ext3_check_descriptors (sb)) {
1883                 ext3_msg(sb, KERN_ERR,
1884                         "error: group descriptors corrupted");
1885                 goto failed_mount2;
1886         }
1887         sbi->s_gdb_count = db_count;
1888         get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1889         spin_lock_init(&sbi->s_next_gen_lock);
1890
1891         /* per fileystem reservation list head & lock */
1892         spin_lock_init(&sbi->s_rsv_window_lock);
1893         sbi->s_rsv_window_root = RB_ROOT;
1894         /* Add a single, static dummy reservation to the start of the
1895          * reservation window list --- it gives us a placeholder for
1896          * append-at-start-of-list which makes the allocation logic
1897          * _much_ simpler. */
1898         sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1899         sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1900         sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1901         sbi->s_rsv_window_head.rsv_goal_size = 0;
1902         ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1903
1904         /*
1905          * set up enough so that it can read an inode
1906          */
1907         sb->s_op = &ext3_sops;
1908         sb->s_export_op = &ext3_export_ops;
1909         sb->s_xattr = ext3_xattr_handlers;
1910 #ifdef CONFIG_QUOTA
1911         sb->s_qcop = &ext3_qctl_operations;
1912         sb->dq_op = &ext3_quota_operations;
1913 #endif
1914         INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1915         mutex_init(&sbi->s_orphan_lock);
1916         mutex_init(&sbi->s_resize_lock);
1917
1918         sb->s_root = NULL;
1919
1920         needs_recovery = (es->s_last_orphan != 0 ||
1921                           EXT3_HAS_INCOMPAT_FEATURE(sb,
1922                                     EXT3_FEATURE_INCOMPAT_RECOVER));
1923
1924         /*
1925          * The first inode we look at is the journal inode.  Don't try
1926          * root first: it may be modified in the journal!
1927          */
1928         if (!test_opt(sb, NOLOAD) &&
1929             EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
1930                 if (ext3_load_journal(sb, es, journal_devnum))
1931                         goto failed_mount2;
1932         } else if (journal_inum) {
1933                 if (ext3_create_journal(sb, es, journal_inum))
1934                         goto failed_mount2;
1935         } else {
1936                 if (!silent)
1937                         ext3_msg(sb, KERN_ERR,
1938                                 "error: no journal found. "
1939                                 "mounting ext3 over ext2?");
1940                 goto failed_mount2;
1941         }
1942         err = percpu_counter_init(&sbi->s_freeblocks_counter,
1943                         ext3_count_free_blocks(sb));
1944         if (!err) {
1945                 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1946                                 ext3_count_free_inodes(sb));
1947         }
1948         if (!err) {
1949                 err = percpu_counter_init(&sbi->s_dirs_counter,
1950                                 ext3_count_dirs(sb));
1951         }
1952         if (err) {
1953                 ext3_msg(sb, KERN_ERR, "error: insufficient memory");
1954                 goto failed_mount3;
1955         }
1956
1957         /* We have now updated the journal if required, so we can
1958          * validate the data journaling mode. */
1959         switch (test_opt(sb, DATA_FLAGS)) {
1960         case 0:
1961                 /* No mode set, assume a default based on the journal
1962                    capabilities: ORDERED_DATA if the journal can
1963                    cope, else JOURNAL_DATA */
1964                 if (journal_check_available_features
1965                     (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
1966                         set_opt(sbi->s_mount_opt, DEFAULT_DATA_MODE);
1967                 else
1968                         set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1969                 break;
1970
1971         case EXT3_MOUNT_ORDERED_DATA:
1972         case EXT3_MOUNT_WRITEBACK_DATA:
1973                 if (!journal_check_available_features
1974                     (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
1975                         ext3_msg(sb, KERN_ERR,
1976                                 "error: journal does not support "
1977                                 "requested data journaling mode");
1978                         goto failed_mount3;
1979                 }
1980         default:
1981                 break;
1982         }
1983
1984         /*
1985          * The journal_load will have done any necessary log recovery,
1986          * so we can safely mount the rest of the filesystem now.
1987          */
1988
1989         root = ext3_iget(sb, EXT3_ROOT_INO);
1990         if (IS_ERR(root)) {
1991                 ext3_msg(sb, KERN_ERR, "error: get root inode failed");
1992                 ret = PTR_ERR(root);
1993                 goto failed_mount3;
1994         }
1995         if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1996                 iput(root);
1997                 ext3_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck");
1998                 goto failed_mount3;
1999         }
2000         sb->s_root = d_alloc_root(root);
2001         if (!sb->s_root) {
2002                 ext3_msg(sb, KERN_ERR, "error: get root dentry failed");
2003                 iput(root);
2004                 ret = -ENOMEM;
2005                 goto failed_mount3;
2006         }
2007
2008         ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
2009
2010         EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
2011         ext3_orphan_cleanup(sb, es);
2012         EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
2013         if (needs_recovery)
2014                 ext3_msg(sb, KERN_INFO, "recovery complete");
2015         ext3_mark_recovery_complete(sb, es);
2016         ext3_msg(sb, KERN_INFO, "mounted filesystem with %s data mode",
2017                 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
2018                 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
2019                 "writeback");
2020
2021         return 0;
2022
2023 cantfind_ext3:
2024         if (!silent)
2025                 ext3_msg(sb, KERN_INFO,
2026                         "error: can't find ext3 filesystem on dev %s.",
2027                        sb->s_id);
2028         goto failed_mount;
2029
2030 failed_mount3:
2031         percpu_counter_destroy(&sbi->s_freeblocks_counter);
2032         percpu_counter_destroy(&sbi->s_freeinodes_counter);
2033         percpu_counter_destroy(&sbi->s_dirs_counter);
2034         journal_destroy(sbi->s_journal);
2035 failed_mount2:
2036         for (i = 0; i < db_count; i++)
2037                 brelse(sbi->s_group_desc[i]);
2038         kfree(sbi->s_group_desc);
2039 failed_mount:
2040 #ifdef CONFIG_QUOTA
2041         for (i = 0; i < MAXQUOTAS; i++)
2042                 kfree(sbi->s_qf_names[i]);
2043 #endif
2044         ext3_blkdev_remove(sbi);
2045         brelse(bh);
2046 out_fail:
2047         sb->s_fs_info = NULL;
2048         kfree(sbi->s_blockgroup_lock);
2049         kfree(sbi);
2050         return ret;
2051 }
2052
2053 /*
2054  * Setup any per-fs journal parameters now.  We'll do this both on
2055  * initial mount, once the journal has been initialised but before we've
2056  * done any recovery; and again on any subsequent remount.
2057  */
2058 static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
2059 {
2060         struct ext3_sb_info *sbi = EXT3_SB(sb);
2061
2062         if (sbi->s_commit_interval)
2063                 journal->j_commit_interval = sbi->s_commit_interval;
2064         /* We could also set up an ext3-specific default for the commit
2065          * interval here, but for now we'll just fall back to the jbd
2066          * default. */
2067
2068         spin_lock(&journal->j_state_lock);
2069         if (test_opt(sb, BARRIER))
2070                 journal->j_flags |= JFS_BARRIER;
2071         else
2072                 journal->j_flags &= ~JFS_BARRIER;
2073         if (test_opt(sb, DATA_ERR_ABORT))
2074                 journal->j_flags |= JFS_ABORT_ON_SYNCDATA_ERR;
2075         else
2076                 journal->j_flags &= ~JFS_ABORT_ON_SYNCDATA_ERR;
2077         spin_unlock(&journal->j_state_lock);
2078 }
2079
2080 static journal_t *ext3_get_journal(struct super_block *sb,
2081                                    unsigned int journal_inum)
2082 {
2083         struct inode *journal_inode;
2084         journal_t *journal;
2085
2086         /* First, test for the existence of a valid inode on disk.  Bad
2087          * things happen if we iget() an unused inode, as the subsequent
2088          * iput() will try to delete it. */
2089
2090         journal_inode = ext3_iget(sb, journal_inum);
2091         if (IS_ERR(journal_inode)) {
2092                 ext3_msg(sb, KERN_ERR, "error: no journal found");
2093                 return NULL;
2094         }
2095         if (!journal_inode->i_nlink) {
2096                 make_bad_inode(journal_inode);
2097                 iput(journal_inode);
2098                 ext3_msg(sb, KERN_ERR, "error: journal inode is deleted");
2099                 return NULL;
2100         }
2101
2102         jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2103                   journal_inode, journal_inode->i_size);
2104         if (!S_ISREG(journal_inode->i_mode)) {
2105                 ext3_msg(sb, KERN_ERR, "error: invalid journal inode");
2106                 iput(journal_inode);
2107                 return NULL;
2108         }
2109
2110         journal = journal_init_inode(journal_inode);
2111         if (!journal) {
2112                 ext3_msg(sb, KERN_ERR, "error: could not load journal inode");
2113                 iput(journal_inode);
2114                 return NULL;
2115         }
2116         journal->j_private = sb;
2117         ext3_init_journal_params(sb, journal);
2118         return journal;
2119 }
2120
2121 static journal_t *ext3_get_dev_journal(struct super_block *sb,
2122                                        dev_t j_dev)
2123 {
2124         struct buffer_head * bh;
2125         journal_t *journal;
2126         ext3_fsblk_t start;
2127         ext3_fsblk_t len;
2128         int hblock, blocksize;
2129         ext3_fsblk_t sb_block;
2130         unsigned long offset;
2131         struct ext3_super_block * es;
2132         struct block_device *bdev;
2133
2134         bdev = ext3_blkdev_get(j_dev, sb);
2135         if (bdev == NULL)
2136                 return NULL;
2137
2138         if (bd_claim(bdev, sb)) {
2139                 ext3_msg(sb, KERN_ERR,
2140                         "error: failed to claim external journal device");
2141                 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
2142                 return NULL;
2143         }
2144
2145         blocksize = sb->s_blocksize;
2146         hblock = bdev_logical_block_size(bdev);
2147         if (blocksize < hblock) {
2148                 ext3_msg(sb, KERN_ERR,
2149                         "error: blocksize too small for journal device");
2150                 goto out_bdev;
2151         }
2152
2153         sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
2154         offset = EXT3_MIN_BLOCK_SIZE % blocksize;
2155         set_blocksize(bdev, blocksize);
2156         if (!(bh = __bread(bdev, sb_block, blocksize))) {
2157                 ext3_msg(sb, KERN_ERR, "error: couldn't read superblock of "
2158                         "external journal");
2159                 goto out_bdev;
2160         }
2161
2162         es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
2163         if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
2164             !(le32_to_cpu(es->s_feature_incompat) &
2165               EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2166                 ext3_msg(sb, KERN_ERR, "error: external journal has "
2167                         "bad superblock");
2168                 brelse(bh);
2169                 goto out_bdev;
2170         }
2171
2172         if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2173                 ext3_msg(sb, KERN_ERR, "error: journal UUID does not match");
2174                 brelse(bh);
2175                 goto out_bdev;
2176         }
2177
2178         len = le32_to_cpu(es->s_blocks_count);
2179         start = sb_block + 1;
2180         brelse(bh);     /* we're done with the superblock */
2181
2182         journal = journal_init_dev(bdev, sb->s_bdev,
2183                                         start, len, blocksize);
2184         if (!journal) {
2185                 ext3_msg(sb, KERN_ERR,
2186                         "error: failed to create device journal");
2187                 goto out_bdev;
2188         }
2189         journal->j_private = sb;
2190         ll_rw_block(READ, 1, &journal->j_sb_buffer);
2191         wait_on_buffer(journal->j_sb_buffer);
2192         if (!buffer_uptodate(journal->j_sb_buffer)) {
2193                 ext3_msg(sb, KERN_ERR, "I/O error on journal device");
2194                 goto out_journal;
2195         }
2196         if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
2197                 ext3_msg(sb, KERN_ERR,
2198                         "error: external journal has more than one "
2199                         "user (unsupported) - %d",
2200                         be32_to_cpu(journal->j_superblock->s_nr_users));
2201                 goto out_journal;
2202         }
2203         EXT3_SB(sb)->journal_bdev = bdev;
2204         ext3_init_journal_params(sb, journal);
2205         return journal;
2206 out_journal:
2207         journal_destroy(journal);
2208 out_bdev:
2209         ext3_blkdev_put(bdev);
2210         return NULL;
2211 }
2212
2213 static int ext3_load_journal(struct super_block *sb,
2214                              struct ext3_super_block *es,
2215                              unsigned long journal_devnum)
2216 {
2217         journal_t *journal;
2218         unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2219         dev_t journal_dev;
2220         int err = 0;
2221         int really_read_only;
2222
2223         if (journal_devnum &&
2224             journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2225                 ext3_msg(sb, KERN_INFO, "external journal device major/minor "
2226                         "numbers have changed");
2227                 journal_dev = new_decode_dev(journal_devnum);
2228         } else
2229                 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2230
2231         really_read_only = bdev_read_only(sb->s_bdev);
2232
2233         /*
2234          * Are we loading a blank journal or performing recovery after a
2235          * crash?  For recovery, we need to check in advance whether we
2236          * can get read-write access to the device.
2237          */
2238
2239         if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
2240                 if (sb->s_flags & MS_RDONLY) {
2241                         ext3_msg(sb, KERN_INFO,
2242                                 "recovery required on readonly filesystem");
2243                         if (really_read_only) {
2244                                 ext3_msg(sb, KERN_ERR, "error: write access "
2245                                         "unavailable, cannot proceed");
2246                                 return -EROFS;
2247                         }
2248                         ext3_msg(sb, KERN_INFO,
2249                                 "write access will be enabled during recovery");
2250                 }
2251         }
2252
2253         if (journal_inum && journal_dev) {
2254                 ext3_msg(sb, KERN_ERR, "error: filesystem has both journal "
2255                        "and inode journals");
2256                 return -EINVAL;
2257         }
2258
2259         if (journal_inum) {
2260                 if (!(journal = ext3_get_journal(sb, journal_inum)))
2261                         return -EINVAL;
2262         } else {
2263                 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
2264                         return -EINVAL;
2265         }
2266
2267         if (!(journal->j_flags & JFS_BARRIER))
2268                 printk(KERN_INFO "EXT3-fs: barriers not enabled\n");
2269
2270         if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2271                 err = journal_update_format(journal);
2272                 if (err)  {
2273                         ext3_msg(sb, KERN_ERR, "error updating journal");
2274                         journal_destroy(journal);
2275                         return err;
2276                 }
2277         }
2278
2279         if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
2280                 err = journal_wipe(journal, !really_read_only);
2281         if (!err)
2282                 err = journal_load(journal);
2283
2284         if (err) {
2285                 ext3_msg(sb, KERN_ERR, "error loading journal");
2286                 journal_destroy(journal);
2287                 return err;
2288         }
2289
2290         EXT3_SB(sb)->s_journal = journal;
2291         ext3_clear_journal_err(sb, es);
2292
2293         if (journal_devnum &&
2294             journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2295                 es->s_journal_dev = cpu_to_le32(journal_devnum);
2296
2297                 /* Make sure we flush the recovery flag to disk. */
2298                 ext3_commit_super(sb, es, 1);
2299         }
2300
2301         return 0;
2302 }
2303
2304 static int ext3_create_journal(struct super_block *sb,
2305                                struct ext3_super_block *es,
2306                                unsigned int journal_inum)
2307 {
2308         journal_t *journal;
2309         int err;
2310
2311         if (sb->s_flags & MS_RDONLY) {
2312                 ext3_msg(sb, KERN_ERR,
2313                         "error: readonly filesystem when trying to "
2314                         "create journal");
2315                 return -EROFS;
2316         }
2317
2318         journal = ext3_get_journal(sb, journal_inum);
2319         if (!journal)
2320                 return -EINVAL;
2321
2322         ext3_msg(sb, KERN_INFO, "creating new journal on inode %u",
2323                journal_inum);
2324
2325         err = journal_create(journal);
2326         if (err) {
2327                 ext3_msg(sb, KERN_ERR, "error creating journal");
2328                 journal_destroy(journal);
2329                 return -EIO;
2330         }
2331
2332         EXT3_SB(sb)->s_journal = journal;
2333
2334         ext3_update_dynamic_rev(sb);
2335         EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2336         EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2337
2338         es->s_journal_inum = cpu_to_le32(journal_inum);
2339
2340         /* Make sure we flush the recovery flag to disk. */
2341         ext3_commit_super(sb, es, 1);
2342
2343         return 0;
2344 }
2345
2346 static int ext3_commit_super(struct super_block *sb,
2347                                struct ext3_super_block *es,
2348                                int sync)
2349 {
2350         struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
2351         int error = 0;
2352
2353         if (!sbh)
2354                 return error;
2355         /*
2356          * If the file system is mounted read-only, don't update the
2357          * superblock write time.  This avoids updating the superblock
2358          * write time when we are mounting the root file system
2359          * read/only but we need to replay the journal; at that point,
2360          * for people who are east of GMT and who make their clock
2361          * tick in localtime for Windows bug-for-bug compatibility,
2362          * the clock is set in the future, and this will cause e2fsck
2363          * to complain and force a full file system check.
2364          */
2365         if (!(sb->s_flags & MS_RDONLY))
2366                 es->s_wtime = cpu_to_le32(get_seconds());
2367         es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2368         es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2369         BUFFER_TRACE(sbh, "marking dirty");
2370         mark_buffer_dirty(sbh);
2371         if (sync)
2372                 error = sync_dirty_buffer(sbh);
2373         return error;
2374 }
2375
2376
2377 /*
2378  * Have we just finished recovery?  If so, and if we are mounting (or
2379  * remounting) the filesystem readonly, then we will end up with a
2380  * consistent fs on disk.  Record that fact.
2381  */
2382 static void ext3_mark_recovery_complete(struct super_block * sb,
2383                                         struct ext3_super_block * es)
2384 {
2385         journal_t *journal = EXT3_SB(sb)->s_journal;
2386
2387         journal_lock_updates(journal);
2388         if (journal_flush(journal) < 0)
2389                 goto out;
2390
2391         if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2392             sb->s_flags & MS_RDONLY) {
2393                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2394                 ext3_commit_super(sb, es, 1);
2395         }
2396
2397 out:
2398         journal_unlock_updates(journal);
2399 }
2400
2401 /*
2402  * If we are mounting (or read-write remounting) a filesystem whose journal
2403  * has recorded an error from a previous lifetime, move that error to the
2404  * main filesystem now.
2405  */
2406 static void ext3_clear_journal_err(struct super_block *sb,
2407                                    struct ext3_super_block *es)
2408 {
2409         journal_t *journal;
2410         int j_errno;
2411         const char *errstr;
2412
2413         journal = EXT3_SB(sb)->s_journal;
2414
2415         /*
2416          * Now check for any error status which may have been recorded in the
2417          * journal by a prior ext3_error() or ext3_abort()
2418          */
2419
2420         j_errno = journal_errno(journal);
2421         if (j_errno) {
2422                 char nbuf[16];
2423
2424                 errstr = ext3_decode_error(sb, j_errno, nbuf);
2425                 ext3_warning(sb, __func__, "Filesystem error recorded "
2426                              "from previous mount: %s", errstr);
2427                 ext3_warning(sb, __func__, "Marking fs in need of "
2428                              "filesystem check.");
2429
2430                 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2431                 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2432                 ext3_commit_super (sb, es, 1);
2433
2434                 journal_clear_err(journal);
2435         }
2436 }
2437
2438 /*
2439  * Force the running and committing transactions to commit,
2440  * and wait on the commit.
2441  */
2442 int ext3_force_commit(struct super_block *sb)
2443 {
2444         journal_t *journal;
2445         int ret;
2446
2447         if (sb->s_flags & MS_RDONLY)
2448                 return 0;
2449
2450         journal = EXT3_SB(sb)->s_journal;
2451         ret = ext3_journal_force_commit(journal);
2452         return ret;
2453 }
2454
2455 static int ext3_sync_fs(struct super_block *sb, int wait)
2456 {
2457         tid_t target;
2458
2459         if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2460                 if (wait)
2461                         log_wait_commit(EXT3_SB(sb)->s_journal, target);
2462         }
2463         return 0;
2464 }
2465
2466 /*
2467  * LVM calls this function before a (read-only) snapshot is created.  This
2468  * gives us a chance to flush the journal completely and mark the fs clean.
2469  */
2470 static int ext3_freeze(struct super_block *sb)
2471 {
2472         int error = 0;
2473         journal_t *journal;
2474
2475         if (!(sb->s_flags & MS_RDONLY)) {
2476                 journal = EXT3_SB(sb)->s_journal;
2477
2478                 /* Now we set up the journal barrier. */
2479                 journal_lock_updates(journal);
2480
2481                 /*
2482                  * We don't want to clear needs_recovery flag when we failed
2483                  * to flush the journal.
2484                  */
2485                 error = journal_flush(journal);
2486                 if (error < 0)
2487                         goto out;
2488
2489                 /* Journal blocked and flushed, clear needs_recovery flag. */
2490                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2491                 error = ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2492                 if (error)
2493                         goto out;
2494         }
2495         return 0;
2496
2497 out:
2498         journal_unlock_updates(journal);
2499         return error;
2500 }
2501
2502 /*
2503  * Called by LVM after the snapshot is done.  We need to reset the RECOVER
2504  * flag here, even though the filesystem is not technically dirty yet.
2505  */
2506 static int ext3_unfreeze(struct super_block *sb)
2507 {
2508         if (!(sb->s_flags & MS_RDONLY)) {
2509                 lock_super(sb);
2510                 /* Reser the needs_recovery flag before the fs is unlocked. */
2511                 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2512                 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2513                 unlock_super(sb);
2514                 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2515         }
2516         return 0;
2517 }
2518
2519 static int ext3_remount (struct super_block * sb, int * flags, char * data)
2520 {
2521         struct ext3_super_block * es;
2522         struct ext3_sb_info *sbi = EXT3_SB(sb);
2523         ext3_fsblk_t n_blocks_count = 0;
2524         unsigned long old_sb_flags;
2525         struct ext3_mount_options old_opts;
2526         int enable_quota = 0;
2527         int err;
2528 #ifdef CONFIG_QUOTA
2529         int i;
2530 #endif
2531
2532         /* Store the original options */
2533         lock_super(sb);
2534         old_sb_flags = sb->s_flags;
2535         old_opts.s_mount_opt = sbi->s_mount_opt;
2536         old_opts.s_resuid = sbi->s_resuid;
2537         old_opts.s_resgid = sbi->s_resgid;
2538         old_opts.s_commit_interval = sbi->s_commit_interval;
2539 #ifdef CONFIG_QUOTA
2540         old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2541         for (i = 0; i < MAXQUOTAS; i++)
2542                 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2543 #endif
2544
2545         /*
2546          * Allow the "check" option to be passed as a remount option.
2547          */
2548         if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2549                 err = -EINVAL;
2550                 goto restore_opts;
2551         }
2552
2553         if (test_opt(sb, ABORT))
2554                 ext3_abort(sb, __func__, "Abort forced by user");
2555
2556         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2557                 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
2558
2559         es = sbi->s_es;
2560
2561         ext3_init_journal_params(sb, sbi->s_journal);
2562
2563         if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2564                 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
2565                 if (test_opt(sb, ABORT)) {
2566                         err = -EROFS;
2567                         goto restore_opts;
2568                 }
2569
2570                 if (*flags & MS_RDONLY) {
2571                         err = dquot_suspend(sb, -1);
2572                         if (err < 0)
2573                                 goto restore_opts;
2574
2575                         /*
2576                          * First of all, the unconditional stuff we have to do
2577                          * to disable replay of the journal when we next remount
2578                          */
2579                         sb->s_flags |= MS_RDONLY;
2580
2581                         /*
2582                          * OK, test if we are remounting a valid rw partition
2583                          * readonly, and if so set the rdonly flag and then
2584                          * mark the partition as valid again.
2585                          */
2586                         if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2587                             (sbi->s_mount_state & EXT3_VALID_FS))
2588                                 es->s_state = cpu_to_le16(sbi->s_mount_state);
2589
2590                         ext3_mark_recovery_complete(sb, es);
2591                 } else {
2592                         __le32 ret;
2593                         if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2594                                         ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2595                                 ext3_msg(sb, KERN_WARNING,
2596                                         "warning: couldn't remount RDWR "
2597                                         "because of unsupported optional "
2598                                         "features (%x)", le32_to_cpu(ret));
2599                                 err = -EROFS;
2600                                 goto restore_opts;
2601                         }
2602
2603                         /*
2604                          * If we have an unprocessed orphan list hanging
2605                          * around from a previously readonly bdev mount,
2606                          * require a full umount/remount for now.
2607                          */
2608                         if (es->s_last_orphan) {
2609                                 ext3_msg(sb, KERN_WARNING, "warning: couldn't "
2610                                        "remount RDWR because of unprocessed "
2611                                        "orphan inode list.  Please "
2612                                        "umount/remount instead.");
2613                                 err = -EINVAL;
2614                                 goto restore_opts;
2615                         }
2616
2617                         /*
2618                          * Mounting a RDONLY partition read-write, so reread
2619                          * and store the current valid flag.  (It may have
2620                          * been changed by e2fsck since we originally mounted
2621                          * the partition.)
2622                          */
2623                         ext3_clear_journal_err(sb, es);
2624                         sbi->s_mount_state = le16_to_cpu(es->s_state);
2625                         if ((err = ext3_group_extend(sb, es, n_blocks_count)))
2626                                 goto restore_opts;
2627                         if (!ext3_setup_super (sb, es, 0))
2628                                 sb->s_flags &= ~MS_RDONLY;
2629                         enable_quota = 1;
2630                 }
2631         }
2632 #ifdef CONFIG_QUOTA
2633         /* Release old quota file names */
2634         for (i = 0; i < MAXQUOTAS; i++)
2635                 if (old_opts.s_qf_names[i] &&
2636                     old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2637                         kfree(old_opts.s_qf_names[i]);
2638 #endif
2639         unlock_super(sb);
2640
2641         if (enable_quota)
2642                 dquot_resume(sb, -1);
2643         return 0;
2644 restore_opts:
2645         sb->s_flags = old_sb_flags;
2646         sbi->s_mount_opt = old_opts.s_mount_opt;
2647         sbi->s_resuid = old_opts.s_resuid;
2648         sbi->s_resgid = old_opts.s_resgid;
2649         sbi->s_commit_interval = old_opts.s_commit_interval;
2650 #ifdef CONFIG_QUOTA
2651         sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2652         for (i = 0; i < MAXQUOTAS; i++) {
2653                 if (sbi->s_qf_names[i] &&
2654                     old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2655                         kfree(sbi->s_qf_names[i]);
2656                 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2657         }
2658 #endif
2659         unlock_super(sb);
2660         return err;
2661 }
2662
2663 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
2664 {
2665         struct super_block *sb = dentry->d_sb;
2666         struct ext3_sb_info *sbi = EXT3_SB(sb);
2667         struct ext3_super_block *es = sbi->s_es;
2668         u64 fsid;
2669
2670         if (test_opt(sb, MINIX_DF)) {
2671                 sbi->s_overhead_last = 0;
2672         } else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
2673                 unsigned long ngroups = sbi->s_groups_count, i;
2674                 ext3_fsblk_t overhead = 0;
2675                 smp_rmb();
2676
2677                 /*
2678                  * Compute the overhead (FS structures).  This is constant
2679                  * for a given filesystem unless the number of block groups
2680                  * changes so we cache the previous value until it does.
2681                  */
2682
2683                 /*
2684                  * All of the blocks before first_data_block are
2685                  * overhead
2686                  */
2687                 overhead = le32_to_cpu(es->s_first_data_block);
2688
2689                 /*
2690                  * Add the overhead attributed to the superblock and
2691                  * block group descriptors.  If the sparse superblocks
2692                  * feature is turned on, then not all groups have this.
2693                  */
2694                 for (i = 0; i < ngroups; i++) {
2695                         overhead += ext3_bg_has_super(sb, i) +
2696                                 ext3_bg_num_gdb(sb, i);
2697                         cond_resched();
2698                 }
2699
2700                 /*
2701                  * Every block group has an inode bitmap, a block
2702                  * bitmap, and an inode table.
2703                  */
2704                 overhead += ngroups * (2 + sbi->s_itb_per_group);
2705                 sbi->s_overhead_last = overhead;
2706                 smp_wmb();
2707                 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
2708         }
2709
2710         buf->f_type = EXT3_SUPER_MAGIC;
2711         buf->f_bsize = sb->s_blocksize;
2712         buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
2713         buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
2714         buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2715         if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2716                 buf->f_bavail = 0;
2717         buf->f_files = le32_to_cpu(es->s_inodes_count);
2718         buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
2719         buf->f_namelen = EXT3_NAME_LEN;
2720         fsid = le64_to_cpup((void *)es->s_uuid) ^
2721                le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2722         buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2723         buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
2724         return 0;
2725 }
2726
2727 /* Helper function for writing quotas on sync - we need to start transaction before quota file
2728  * is locked for write. Otherwise the are possible deadlocks:
2729  * Process 1                         Process 2
2730  * ext3_create()                     quota_sync()
2731  *   journal_start()                   write_dquot()
2732  *   dquot_initialize()                       down(dqio_mutex)
2733  *     down(dqio_mutex)                    journal_start()
2734  *
2735  */
2736
2737 #ifdef CONFIG_QUOTA
2738
2739 static inline struct inode *dquot_to_inode(struct dquot *dquot)
2740 {
2741         return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2742 }
2743
2744 static int ext3_write_dquot(struct dquot *dquot)
2745 {
2746         int ret, err;
2747         handle_t *handle;
2748         struct inode *inode;
2749
2750         inode = dquot_to_inode(dquot);
2751         handle = ext3_journal_start(inode,
2752                                         EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2753         if (IS_ERR(handle))
2754                 return PTR_ERR(handle);
2755         ret = dquot_commit(dquot);
2756         err = ext3_journal_stop(handle);
2757         if (!ret)
2758                 ret = err;
2759         return ret;
2760 }
2761
2762 static int ext3_acquire_dquot(struct dquot *dquot)
2763 {
2764         int ret, err;
2765         handle_t *handle;
2766
2767         handle = ext3_journal_start(dquot_to_inode(dquot),
2768                                         EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2769         if (IS_ERR(handle))
2770                 return PTR_ERR(handle);
2771         ret = dquot_acquire(dquot);
2772         err = ext3_journal_stop(handle);
2773         if (!ret)
2774                 ret = err;
2775         return ret;
2776 }
2777
2778 static int ext3_release_dquot(struct dquot *dquot)
2779 {
2780         int ret, err;
2781         handle_t *handle;
2782
2783         handle = ext3_journal_start(dquot_to_inode(dquot),
2784                                         EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2785         if (IS_ERR(handle)) {
2786                 /* Release dquot anyway to avoid endless cycle in dqput() */
2787                 dquot_release(dquot);
2788                 return PTR_ERR(handle);
2789         }
2790         ret = dquot_release(dquot);
2791         err = ext3_journal_stop(handle);
2792         if (!ret)
2793                 ret = err;
2794         return ret;
2795 }
2796
2797 static int ext3_mark_dquot_dirty(struct dquot *dquot)
2798 {
2799         /* Are we journaling quotas? */
2800         if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2801             EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2802                 dquot_mark_dquot_dirty(dquot);
2803                 return ext3_write_dquot(dquot);
2804         } else {
2805                 return dquot_mark_dquot_dirty(dquot);
2806         }
2807 }
2808
2809 static int ext3_write_info(struct super_block *sb, int type)
2810 {
2811         int ret, err;
2812         handle_t *handle;
2813
2814         /* Data block + inode block */
2815         handle = ext3_journal_start(sb->s_root->d_inode, 2);
2816         if (IS_ERR(handle))
2817                 return PTR_ERR(handle);
2818         ret = dquot_commit_info(sb, type);
2819         err = ext3_journal_stop(handle);
2820         if (!ret)
2821                 ret = err;
2822         return ret;
2823 }
2824
2825 /*
2826  * Turn on quotas during mount time - we need to find
2827  * the quota file and such...
2828  */
2829 static int ext3_quota_on_mount(struct super_block *sb, int type)
2830 {
2831         return dquot_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2832                                         EXT3_SB(sb)->s_jquota_fmt, type);
2833 }
2834
2835 /*
2836  * Standard function to be called on quota_on
2837  */
2838 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
2839                          char *name)
2840 {
2841         int err;
2842         struct path path;
2843
2844         if (!test_opt(sb, QUOTA))
2845                 return -EINVAL;
2846
2847         err = kern_path(name, LOOKUP_FOLLOW, &path);
2848         if (err)
2849                 return err;
2850
2851         /* Quotafile not on the same filesystem? */
2852         if (path.mnt->mnt_sb != sb) {
2853                 path_put(&path);
2854                 return -EXDEV;
2855         }
2856         /* Journaling quota? */
2857         if (EXT3_SB(sb)->s_qf_names[type]) {
2858                 /* Quotafile not of fs root? */
2859                 if (path.dentry->d_parent != sb->s_root)
2860                         ext3_msg(sb, KERN_WARNING,
2861                                 "warning: Quota file not on filesystem root. "
2862                                 "Journaled quota will not work.");
2863         }
2864
2865         /*
2866          * When we journal data on quota file, we have to flush journal to see
2867          * all updates to the file when we bypass pagecache...
2868          */
2869         if (ext3_should_journal_data(path.dentry->d_inode)) {
2870                 /*
2871                  * We don't need to lock updates but journal_flush() could
2872                  * otherwise be livelocked...
2873                  */
2874                 journal_lock_updates(EXT3_SB(sb)->s_journal);
2875                 err = journal_flush(EXT3_SB(sb)->s_journal);
2876                 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2877                 if (err) {
2878                         path_put(&path);
2879                         return err;
2880                 }
2881         }
2882
2883         err = dquot_quota_on_path(sb, type, format_id, &path);
2884         path_put(&path);
2885         return err;
2886 }
2887
2888 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2889  * acquiring the locks... As quota files are never truncated and quota code
2890  * itself serializes the operations (and noone else should touch the files)
2891  * we don't have to be afraid of races */
2892 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2893                                size_t len, loff_t off)
2894 {
2895         struct inode *inode = sb_dqopt(sb)->files[type];
2896         sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2897         int err = 0;
2898         int offset = off & (sb->s_blocksize - 1);
2899         int tocopy;
2900         size_t toread;
2901         struct buffer_head *bh;
2902         loff_t i_size = i_size_read(inode);
2903
2904         if (off > i_size)
2905                 return 0;
2906         if (off+len > i_size)
2907                 len = i_size-off;
2908         toread = len;
2909         while (toread > 0) {
2910                 tocopy = sb->s_blocksize - offset < toread ?
2911                                 sb->s_blocksize - offset : toread;
2912                 bh = ext3_bread(NULL, inode, blk, 0, &err);
2913                 if (err)
2914                         return err;
2915                 if (!bh)        /* A hole? */
2916                         memset(data, 0, tocopy);
2917                 else
2918                         memcpy(data, bh->b_data+offset, tocopy);
2919                 brelse(bh);
2920                 offset = 0;
2921                 toread -= tocopy;
2922                 data += tocopy;
2923                 blk++;
2924         }
2925         return len;
2926 }
2927
2928 /* Write to quotafile (we know the transaction is already started and has
2929  * enough credits) */
2930 static ssize_t ext3_quota_write(struct super_block *sb, int type,
2931                                 const char *data, size_t len, loff_t off)
2932 {
2933         struct inode *inode = sb_dqopt(sb)->files[type];
2934         sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2935         int err = 0;
2936         int offset = off & (sb->s_blocksize - 1);
2937         int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
2938         struct buffer_head *bh;
2939         handle_t *handle = journal_current_handle();
2940
2941         if (!handle) {
2942                 ext3_msg(sb, KERN_WARNING,
2943                         "warning: quota write (off=%llu, len=%llu)"
2944                         " cancelled because transaction is not started.",
2945                         (unsigned long long)off, (unsigned long long)len);
2946                 return -EIO;
2947         }
2948
2949         /*
2950          * Since we account only one data block in transaction credits,
2951          * then it is impossible to cross a block boundary.
2952          */
2953         if (sb->s_blocksize - offset < len) {
2954                 ext3_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
2955                         " cancelled because not block aligned",
2956                         (unsigned long long)off, (unsigned long long)len);
2957                 return -EIO;
2958         }
2959         mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2960         bh = ext3_bread(handle, inode, blk, 1, &err);
2961         if (!bh)
2962                 goto out;
2963         if (journal_quota) {
2964                 err = ext3_journal_get_write_access(handle, bh);
2965                 if (err) {
2966                         brelse(bh);
2967                         goto out;
2968                 }
2969         }
2970         lock_buffer(bh);
2971         memcpy(bh->b_data+offset, data, len);
2972         flush_dcache_page(bh->b_page);
2973         unlock_buffer(bh);
2974         if (journal_quota)
2975                 err = ext3_journal_dirty_metadata(handle, bh);
2976         else {
2977                 /* Always do at least ordered writes for quotas */
2978                 err = ext3_journal_dirty_data(handle, bh);
2979                 mark_buffer_dirty(bh);
2980         }
2981         brelse(bh);
2982 out:
2983         if (err) {
2984                 mutex_unlock(&inode->i_mutex);
2985                 return err;
2986         }
2987         if (inode->i_size < off + len) {
2988                 i_size_write(inode, off + len);
2989                 EXT3_I(inode)->i_disksize = inode->i_size;
2990         }
2991         inode->i_version++;
2992         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2993         ext3_mark_inode_dirty(handle, inode);
2994         mutex_unlock(&inode->i_mutex);
2995         return len;
2996 }
2997
2998 #endif
2999
3000 static int ext3_get_sb(struct file_system_type *fs_type,
3001         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
3002 {
3003         return get_sb_bdev(fs_type, flags, dev_name, data, ext3_fill_super, mnt);
3004 }
3005
3006 static struct file_system_type ext3_fs_type = {
3007         .owner          = THIS_MODULE,
3008         .name           = "ext3",
3009         .get_sb         = ext3_get_sb,
3010         .kill_sb        = kill_block_super,
3011         .fs_flags       = FS_REQUIRES_DEV,
3012 };
3013
3014 static int __init init_ext3_fs(void)
3015 {
3016         int err = init_ext3_xattr();
3017         if (err)
3018                 return err;
3019         err = init_inodecache();
3020         if (err)
3021                 goto out1;
3022         err = register_filesystem(&ext3_fs_type);
3023         if (err)
3024                 goto out;
3025         return 0;
3026 out:
3027         destroy_inodecache();
3028 out1:
3029         exit_ext3_xattr();
3030         return err;
3031 }
3032
3033 static void __exit exit_ext3_fs(void)
3034 {
3035         unregister_filesystem(&ext3_fs_type);
3036         destroy_inodecache();
3037         exit_ext3_xattr();
3038 }
3039
3040 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
3041 MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
3042 MODULE_LICENSE("GPL");
3043 module_init(init_ext3_fs)
3044 module_exit(exit_ext3_fs)