fs/ext3/super.c

   1 /*
   2  *  linux/fs/ext3/super.c
   3  *
   4  * Copyright (C) 1992, 1993, 1994, 1995
   5  * Remy Card (card@masi.ibp.fr)
   6  * Laboratoire MASI - Institut Blaise Pascal
   7  * Universite Pierre et Marie Curie (Paris VI)
   8  *
   9  *  from
  10  *
  11  *  linux/fs/minix/inode.c
  12  *
  13  *  Copyright (C) 1991, 1992  Linus Torvalds
  14  *
  15  *  Big-endian to little-endian byte-swapping/bitmaps by
  16  *        David S. Miller (davem@caip.rutgers.edu), 1995
  17  */
  18
  19 #include <linux/module.h>
  20 #include <linux/string.h>
  21 #include <linux/fs.h>
  22 #include <linux/time.h>
  23 #include <linux/jbd.h>
  24 #include <linux/ext3_fs.h>
  25 #include <linux/ext3_jbd.h>
  26 #include <linux/slab.h>
  27 #include <linux/init.h>
  28 #include <linux/blkdev.h>
  29 #include <linux/parser.h>
  30 #include <linux/smp_lock.h>
  31 #include <linux/buffer_head.h>
  32 #include <linux/exportfs.h>
  33 #include <linux/vfs.h>
  34 #include <linux/random.h>
  35 #include <linux/mount.h>
  36 #include <linux/namei.h>
  37 #include <linux/quotaops.h>
  38 #include <linux/seq_file.h>
  39 #include <linux/log2.h>
  40
  41 #include <asm/uaccess.h>
  42
  43 #include "xattr.h"
  44 #include "acl.h"
  45 #include "namei.h"
  46
  47 static int ext3_load_journal(struct super_block *, struct ext3_super_block *,
  48                              unsigned long journal_devnum);
  49 static int ext3_create_journal(struct super_block *, struct ext3_super_block *,
  50                                unsigned int);
  51 static void ext3_commit_super (struct super_block * sb,
  52                                struct ext3_super_block * es,
  53                                int sync);
  54 static void ext3_mark_recovery_complete(struct super_block * sb,
  55                                         struct ext3_super_block * es);
  56 static void ext3_clear_journal_err(struct super_block * sb,
  57                                    struct ext3_super_block * es);
  58 static int ext3_sync_fs(struct super_block *sb, int wait);
  59 static const char *ext3_decode_error(struct super_block * sb, int errno,
  60                                      char nbuf[16]);
  61 static int ext3_remount (struct super_block * sb, int * flags, char * data);
  62 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf);
  63 static void ext3_unlockfs(struct super_block *sb);
  64 static void ext3_write_super (struct super_block * sb);
  65 static void ext3_write_super_lockfs(struct super_block *sb);
  66
  67 /*
  68  * Wrappers for journal_start/end.
  69  *
  70  * The only special thing we need to do here is to make sure that all
  71  * journal_end calls result in the superblock being marked dirty, so
  72  * that sync() will call the filesystem's write_super callback if
  73  * appropriate.
  74  */
  75 handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks)
  76 {
  77         journal_t *journal;
  78
  79         if (sb->s_flags & MS_RDONLY)
  80                 return ERR_PTR(-EROFS);
  81
  82         /* Special case here: if the journal has aborted behind our
  83          * backs (eg. EIO in the commit thread), then we still need to
  84          * take the FS itself readonly cleanly. */
  85         journal = EXT3_SB(sb)->s_journal;
  86         if (is_journal_aborted(journal)) {
  87                 ext3_abort(sb, __func__,
  88                            "Detected aborted journal");
  89                 return ERR_PTR(-EROFS);
  90         }
  91
  92         return journal_start(journal, nblocks);
  93 }
  94
  95 /*
  96  * The only special thing we need to do here is to make sure that all
  97  * journal_stop calls result in the superblock being marked dirty, so
  98  * that sync() will call the filesystem's write_super callback if
  99  * appropriate.
 100  */
 101 int __ext3_journal_stop(const char *where, handle_t *handle)
 102 {
 103         struct super_block *sb;
 104         int err;
 105         int rc;
 106
 107         sb = handle->h_transaction->t_journal->j_private;
 108         err = handle->h_err;
 109         rc = journal_stop(handle);
 110
 111         if (!err)
 112                 err = rc;
 113         if (err)
 114                 __ext3_std_error(sb, where, err);
 115         return err;
 116 }
 117
 118 void ext3_journal_abort_handle(const char *caller, const char *err_fn,
 119                 struct buffer_head *bh, handle_t *handle, int err)
 120 {
 121         char nbuf[16];
 122         const char *errstr = ext3_decode_error(NULL, err, nbuf);
 123
 124         if (bh)
 125                 BUFFER_TRACE(bh, "abort");
 126
 127         if (!handle->h_err)
 128                 handle->h_err = err;
 129
 130         if (is_handle_aborted(handle))
 131                 return;
 132
 133         printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
 134                caller, errstr, err_fn);
 135
 136         journal_abort_handle(handle);
 137 }
 138
 139 /* Deal with the reporting of failure conditions on a filesystem such as
 140  * inconsistencies detected or read IO failures.
 141  *
 142  * On ext2, we can store the error state of the filesystem in the
 143  * superblock.  That is not possible on ext3, because we may have other
 144  * write ordering constraints on the superblock which prevent us from
 145  * writing it out straight away; and given that the journal is about to
 146  * be aborted, we can't rely on the current, or future, transactions to
 147  * write out the superblock safely.
 148  *
 149  * We'll just use the journal_abort() error code to record an error in
 150  * the journal instead.  On recovery, the journal will compain about
 151  * that error until we've noted it down and cleared it.
 152  */
 153
 154 static void ext3_handle_error(struct super_block *sb)
 155 {
 156         struct ext3_super_block *es = EXT3_SB(sb)->s_es;
 157
 158         EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
 159         es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
 160
 161         if (sb->s_flags & MS_RDONLY)
 162                 return;
 163
 164         if (!test_opt (sb, ERRORS_CONT)) {
 165                 journal_t *journal = EXT3_SB(sb)->s_journal;
 166
 167                 EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
 168                 if (journal)
 169                         journal_abort(journal, -EIO);
 170         }
 171         if (test_opt (sb, ERRORS_RO)) {
 172                 printk (KERN_CRIT "Remounting filesystem read-only\n");
 173                 sb->s_flags |= MS_RDONLY;
 174         }
 175         ext3_commit_super(sb, es, 1);
 176         if (test_opt(sb, ERRORS_PANIC))
 177                 panic("EXT3-fs (device %s): panic forced after error\n",
 178                         sb->s_id);
 179 }
 180
 181 void ext3_error (struct super_block * sb, const char * function,
 182                  const char * fmt, ...)
 183 {
 184         va_list args;
 185
 186         va_start(args, fmt);
 187         printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
 188         vprintk(fmt, args);
 189         printk("\n");
 190         va_end(args);
 191
 192         ext3_handle_error(sb);
 193 }
 194
 195 static const char *ext3_decode_error(struct super_block * sb, int errno,
 196                                      char nbuf[16])
 197 {
 198         char *errstr = NULL;
 199
 200         switch (errno) {
 201         case -EIO:
 202                 errstr = "IO failure";
 203                 break;
 204         case -ENOMEM:
 205                 errstr = "Out of memory";
 206                 break;
 207         case -EROFS:
 208                 if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT)
 209                         errstr = "Journal has aborted";
 210                 else
 211                         errstr = "Readonly filesystem";
 212                 break;
 213         default:
 214                 /* If the caller passed in an extra buffer for unknown
 215                  * errors, textualise them now.  Else we just return
 216                  * NULL. */
 217                 if (nbuf) {
 218                         /* Check for truncated error codes... */
 219                         if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
 220                                 errstr = nbuf;
 221                 }
 222                 break;
 223         }
 224
 225         return errstr;
 226 }
 227
 228 /* __ext3_std_error decodes expected errors from journaling functions
 229  * automatically and invokes the appropriate error response.  */
 230
 231 void __ext3_std_error (struct super_block * sb, const char * function,
 232                        int errno)
 233 {
 234         char nbuf[16];
 235         const char *errstr;
 236
 237         /* Special case: if the error is EROFS, and we're not already
 238          * inside a transaction, then there's really no point in logging
 239          * an error. */
 240         if (errno == -EROFS && journal_current_handle() == NULL &&
 241             (sb->s_flags & MS_RDONLY))
 242                 return;
 243
 244         errstr = ext3_decode_error(sb, errno, nbuf);
 245         printk (KERN_CRIT "EXT3-fs error (device %s) in %s: %s\n",
 246                 sb->s_id, function, errstr);
 247
 248         ext3_handle_error(sb);
 249 }
 250
 251 /*
 252  * ext3_abort is a much stronger failure handler than ext3_error.  The
 253  * abort function may be used to deal with unrecoverable failures such
 254  * as journal IO errors or ENOMEM at a critical moment in log management.
 255  *
 256  * We unconditionally force the filesystem into an ABORT|READONLY state,
 257  * unless the error response on the fs has been set to panic in which
 258  * case we take the easy way out and panic immediately.
 259  */
 260
 261 void ext3_abort (struct super_block * sb, const char * function,
 262                  const char * fmt, ...)
 263 {
 264         va_list args;
 265
 266         printk (KERN_CRIT "ext3_abort called.\n");
 267
 268         va_start(args, fmt);
 269         printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
 270         vprintk(fmt, args);
 271         printk("\n");
 272         va_end(args);
 273
 274         if (test_opt(sb, ERRORS_PANIC))
 275                 panic("EXT3-fs panic from previous error\n");
 276
 277         if (sb->s_flags & MS_RDONLY)
 278                 return;
 279
 280         printk(KERN_CRIT "Remounting filesystem read-only\n");
 281         EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
 282         sb->s_flags |= MS_RDONLY;
 283         EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
 284         if (EXT3_SB(sb)->s_journal)
 285                 journal_abort(EXT3_SB(sb)->s_journal, -EIO);
 286 }
 287
 288 void ext3_warning (struct super_block * sb, const char * function,
 289                    const char * fmt, ...)
 290 {
 291         va_list args;
 292
 293         va_start(args, fmt);
 294         printk(KERN_WARNING "EXT3-fs warning (device %s): %s: ",
 295                sb->s_id, function);
 296         vprintk(fmt, args);
 297         printk("\n");
 298         va_end(args);
 299 }
 300
 301 void ext3_update_dynamic_rev(struct super_block *sb)
 302 {
 303         struct ext3_super_block *es = EXT3_SB(sb)->s_es;
 304
 305         if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
 306                 return;
 307
 308         ext3_warning(sb, __func__,
 309                      "updating to rev %d because of new feature flag, "
 310                      "running e2fsck is recommended",
 311                      EXT3_DYNAMIC_REV);
 312
 313         es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO);
 314         es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE);
 315         es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV);
 316         /* leave es->s_feature_*compat flags alone */
 317         /* es->s_uuid will be set by e2fsck if empty */
 318
 319         /*
 320          * The rest of the superblock fields should be zero, and if not it
 321          * means they are likely already in use, so leave them alone.  We
 322          * can leave it up to e2fsck to clean up any inconsistencies there.
 323          */
 324 }
 325
 326 /*
 327  * Open the external journal device
 328  */
 329 static struct block_device *ext3_blkdev_get(dev_t dev)
 330 {
 331         struct block_device *bdev;
 332         char b[BDEVNAME_SIZE];
 333
 334         bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
 335         if (IS_ERR(bdev))
 336                 goto fail;
 337         return bdev;
 338
 339 fail:
 340         printk(KERN_ERR "EXT3: failed to open journal device %s: %ld\n",
 341                         __bdevname(dev, b), PTR_ERR(bdev));
 342         return NULL;
 343 }
 344
 345 /*
 346  * Release the journal device
 347  */
 348 static int ext3_blkdev_put(struct block_device *bdev)
 349 {
 350         bd_release(bdev);
 351         return blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
 352 }
 353
 354 static int ext3_blkdev_remove(struct ext3_sb_info *sbi)
 355 {
 356         struct block_device *bdev;
 357         int ret = -ENODEV;
 358
 359         bdev = sbi->journal_bdev;
 360         if (bdev) {
 361                 ret = ext3_blkdev_put(bdev);
 362                 sbi->journal_bdev = NULL;
 363         }
 364         return ret;
 365 }
 366
 367 static inline struct inode *orphan_list_entry(struct list_head *l)
 368 {
 369         return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
 370 }
 371
 372 static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
 373 {
 374         struct list_head *l;
 375
 376         printk(KERN_ERR "sb orphan head is %d\n",
 377                le32_to_cpu(sbi->s_es->s_last_orphan));
 378
 379         printk(KERN_ERR "sb_info orphan list:\n");
 380         list_for_each(l, &sbi->s_orphan) {
 381                 struct inode *inode = orphan_list_entry(l);
 382                 printk(KERN_ERR "  "
 383                        "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
 384                        inode->i_sb->s_id, inode->i_ino, inode,
 385                        inode->i_mode, inode->i_nlink,
 386                        NEXT_ORPHAN(inode));
 387         }
 388 }
 389
 390 static void ext3_put_super (struct super_block * sb)
 391 {
 392         struct ext3_sb_info *sbi = EXT3_SB(sb);
 393         struct ext3_super_block *es = sbi->s_es;
 394         int i, err;
 395
 396         ext3_xattr_put_super(sb);
 397         err = journal_destroy(sbi->s_journal);
 398         sbi->s_journal = NULL;
 399         if (err < 0)
 400                 ext3_abort(sb, __func__, "Couldn't clean up the journal");
 401
 402         if (!(sb->s_flags & MS_RDONLY)) {
 403                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
 404                 es->s_state = cpu_to_le16(sbi->s_mount_state);
 405                 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
 406                 mark_buffer_dirty(sbi->s_sbh);
 407                 ext3_commit_super(sb, es, 1);
 408         }
 409
 410         for (i = 0; i < sbi->s_gdb_count; i++)
 411                 brelse(sbi->s_group_desc[i]);
 412         kfree(sbi->s_group_desc);
 413         percpu_counter_destroy(&sbi->s_freeblocks_counter);
 414         percpu_counter_destroy(&sbi->s_freeinodes_counter);
 415         percpu_counter_destroy(&sbi->s_dirs_counter);
 416         brelse(sbi->s_sbh);
 417 #ifdef CONFIG_QUOTA
 418         for (i = 0; i < MAXQUOTAS; i++)
 419                 kfree(sbi->s_qf_names[i]);
 420 #endif
 421
 422         /* Debugging code just in case the in-memory inode orphan list
 423          * isn't empty.  The on-disk one can be non-empty if we've
 424          * detected an error and taken the fs readonly, but the
 425          * in-memory list had better be clean by this point. */
 426         if (!list_empty(&sbi->s_orphan))
 427                 dump_orphan_list(sb, sbi);
 428         J_ASSERT(list_empty(&sbi->s_orphan));
 429
 430         invalidate_bdev(sb->s_bdev);
 431         if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
 432                 /*
 433                  * Invalidate the journal device's buffers.  We don't want them
 434                  * floating about in memory - the physical journal device may
 435                  * hotswapped, and it breaks the `ro-after' testing code.
 436                  */
 437                 sync_blockdev(sbi->journal_bdev);
 438                 invalidate_bdev(sbi->journal_bdev);
 439                 ext3_blkdev_remove(sbi);
 440         }
 441         sb->s_fs_info = NULL;
 442         kfree(sbi->s_blockgroup_lock);
 443         kfree(sbi);
 444         return;
 445 }
 446
 447 static struct kmem_cache *ext3_inode_cachep;
 448
 449 /*
 450  * Called inside transaction, so use GFP_NOFS
 451  */
 452 static struct inode *ext3_alloc_inode(struct super_block *sb)
 453 {
 454         struct ext3_inode_info *ei;
 455
 456         ei = kmem_cache_alloc(ext3_inode_cachep, GFP_NOFS);
 457         if (!ei)
 458                 return NULL;
 459 #ifdef CONFIG_EXT3_FS_POSIX_ACL
 460         ei->i_acl = EXT3_ACL_NOT_CACHED;
 461         ei->i_default_acl = EXT3_ACL_NOT_CACHED;
 462 #endif
 463         ei->i_block_alloc_info = NULL;
 464         ei->vfs_inode.i_version = 1;
 465         return &ei->vfs_inode;
 466 }
 467
 468 static void ext3_destroy_inode(struct inode *inode)
 469 {
 470         if (!list_empty(&(EXT3_I(inode)->i_orphan))) {
 471                 printk("EXT3 Inode %p: orphan list check failed!\n",
 472                         EXT3_I(inode));
 473                 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
 474                                 EXT3_I(inode), sizeof(struct ext3_inode_info),
 475                                 false);
 476                 dump_stack();
 477         }
 478         kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
 479 }
 480
 481 static void init_once(void *foo)
 482 {
 483         struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
 484
 485         INIT_LIST_HEAD(&ei->i_orphan);
 486 #ifdef CONFIG_EXT3_FS_XATTR
 487         init_rwsem(&ei->xattr_sem);
 488 #endif
 489         mutex_init(&ei->truncate_mutex);
 490         inode_init_once(&ei->vfs_inode);
 491 }
 492
 493 static int init_inodecache(void)
 494 {
 495         ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
 496                                              sizeof(struct ext3_inode_info),
 497                                              0, (SLAB_RECLAIM_ACCOUNT|
 498                                                 SLAB_MEM_SPREAD),
 499                                              init_once);
 500         if (ext3_inode_cachep == NULL)
 501                 return -ENOMEM;
 502         return 0;
 503 }
 504
 505 static void destroy_inodecache(void)
 506 {
 507         kmem_cache_destroy(ext3_inode_cachep);
 508 }
 509
 510 static void ext3_clear_inode(struct inode *inode)
 511 {
 512         struct ext3_block_alloc_info *rsv = EXT3_I(inode)->i_block_alloc_info;
 513 #ifdef CONFIG_EXT3_FS_POSIX_ACL
 514         if (EXT3_I(inode)->i_acl &&
 515                         EXT3_I(inode)->i_acl != EXT3_ACL_NOT_CACHED) {
 516                 posix_acl_release(EXT3_I(inode)->i_acl);
 517                 EXT3_I(inode)->i_acl = EXT3_ACL_NOT_CACHED;
 518         }
 519         if (EXT3_I(inode)->i_default_acl &&
 520                         EXT3_I(inode)->i_default_acl != EXT3_ACL_NOT_CACHED) {
 521                 posix_acl_release(EXT3_I(inode)->i_default_acl);
 522                 EXT3_I(inode)->i_default_acl = EXT3_ACL_NOT_CACHED;
 523         }
 524 #endif
 525         ext3_discard_reservation(inode);
 526         EXT3_I(inode)->i_block_alloc_info = NULL;
 527         if (unlikely(rsv))
 528                 kfree(rsv);
 529 }
 530
 531 static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
 532 {
 533 #if defined(CONFIG_QUOTA)
 534         struct ext3_sb_info *sbi = EXT3_SB(sb);
 535
 536         if (sbi->s_jquota_fmt)
 537                 seq_printf(seq, ",jqfmt=%s",
 538                 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0");
 539
 540         if (sbi->s_qf_names[USRQUOTA])
 541                 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
 542
 543         if (sbi->s_qf_names[GRPQUOTA])
 544                 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
 545
 546         if (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA)
 547                 seq_puts(seq, ",usrquota");
 548
 549         if (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)
 550                 seq_puts(seq, ",grpquota");
 551 #endif
 552 }
 553
 554 /*
 555  * Show an option if
 556  *  - it's set to a non-default value OR
 557  *  - if the per-sb default is different from the global default
 558  */
 559 static int ext3_show_options(struct seq_file *seq, struct vfsmount *vfs)
 560 {
 561         struct super_block *sb = vfs->mnt_sb;
 562         struct ext3_sb_info *sbi = EXT3_SB(sb);
 563         struct ext3_super_block *es = sbi->s_es;
 564         unsigned long def_mount_opts;
 565
 566         def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
 567
 568         if (sbi->s_sb_block != 1)
 569                 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
 570         if (test_opt(sb, MINIX_DF))
 571                 seq_puts(seq, ",minixdf");
 572         if (test_opt(sb, GRPID))
 573                 seq_puts(seq, ",grpid");
 574         if (!test_opt(sb, GRPID) && (def_mount_opts & EXT3_DEFM_BSDGROUPS))
 575                 seq_puts(seq, ",nogrpid");
 576         if (sbi->s_resuid != EXT3_DEF_RESUID ||
 577             le16_to_cpu(es->s_def_resuid) != EXT3_DEF_RESUID) {
 578                 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
 579         }
 580         if (sbi->s_resgid != EXT3_DEF_RESGID ||
 581             le16_to_cpu(es->s_def_resgid) != EXT3_DEF_RESGID) {
 582                 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
 583         }
 584         if (test_opt(sb, ERRORS_RO)) {
 585                 int def_errors = le16_to_cpu(es->s_errors);
 586
 587                 if (def_errors == EXT3_ERRORS_PANIC ||
 588                     def_errors == EXT3_ERRORS_CONTINUE) {
 589                         seq_puts(seq, ",errors=remount-ro");
 590                 }
 591         }
 592         if (test_opt(sb, ERRORS_CONT))
 593                 seq_puts(seq, ",errors=continue");
 594         if (test_opt(sb, ERRORS_PANIC))
 595                 seq_puts(seq, ",errors=panic");
 596         if (test_opt(sb, NO_UID32))
 597                 seq_puts(seq, ",nouid32");
 598         if (test_opt(sb, DEBUG))
 599                 seq_puts(seq, ",debug");
 600         if (test_opt(sb, OLDALLOC))
 601                 seq_puts(seq, ",oldalloc");
 602 #ifdef CONFIG_EXT3_FS_XATTR
 603         if (test_opt(sb, XATTR_USER))
 604                 seq_puts(seq, ",user_xattr");
 605         if (!test_opt(sb, XATTR_USER) &&
 606             (def_mount_opts & EXT3_DEFM_XATTR_USER)) {
 607                 seq_puts(seq, ",nouser_xattr");
 608         }
 609 #endif
 610 #ifdef CONFIG_EXT3_FS_POSIX_ACL
 611         if (test_opt(sb, POSIX_ACL))
 612                 seq_puts(seq, ",acl");
 613         if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT3_DEFM_ACL))
 614                 seq_puts(seq, ",noacl");
 615 #endif
 616         if (!test_opt(sb, RESERVATION))
 617                 seq_puts(seq, ",noreservation");
 618         if (sbi->s_commit_interval) {
 619                 seq_printf(seq, ",commit=%u",
 620                            (unsigned) (sbi->s_commit_interval / HZ));
 621         }
 622         if (test_opt(sb, BARRIER))
 623                 seq_puts(seq, ",barrier=1");
 624         if (test_opt(sb, NOBH))
 625                 seq_puts(seq, ",nobh");
 626
 627         if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA)
 628                 seq_puts(seq, ",data=journal");
 629         else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA)
 630                 seq_puts(seq, ",data=ordered");
 631         else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)
 632                 seq_puts(seq, ",data=writeback");
 633
 634         if (test_opt(sb, DATA_ERR_ABORT))
 635                 seq_puts(seq, ",data_err=abort");
 636
 637         ext3_show_quota_options(seq, sb);
 638
 639         return 0;
 640 }
 641
 642
 643 static struct inode *ext3_nfs_get_inode(struct super_block *sb,
 644                 u64 ino, u32 generation)
 645 {
 646         struct inode *inode;
 647
 648         if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO)
 649                 return ERR_PTR(-ESTALE);
 650         if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count))
 651                 return ERR_PTR(-ESTALE);
 652
 653         /* iget isn't really right if the inode is currently unallocated!!
 654          *
 655          * ext3_read_inode will return a bad_inode if the inode had been
 656          * deleted, so we should be safe.
 657          *
 658          * Currently we don't know the generation for parent directory, so
 659          * a generation of 0 means "accept any"
 660          */
 661         inode = ext3_iget(sb, ino);
 662         if (IS_ERR(inode))
 663                 return ERR_CAST(inode);
 664         if (generation && inode->i_generation != generation) {
 665                 iput(inode);
 666                 return ERR_PTR(-ESTALE);
 667         }
 668
 669         return inode;
 670 }
 671
 672 static struct dentry *ext3_fh_to_dentry(struct super_block *sb, struct fid *fid,
 673                 int fh_len, int fh_type)
 674 {
 675         return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
 676                                     ext3_nfs_get_inode);
 677 }
 678
 679 static struct dentry *ext3_fh_to_parent(struct super_block *sb, struct fid *fid,
 680                 int fh_len, int fh_type)
 681 {
 682         return generic_fh_to_parent(sb, fid, fh_len, fh_type,
 683                                     ext3_nfs_get_inode);
 684 }
 685
 686 /*
 687  * Try to release metadata pages (indirect blocks, directories) which are
 688  * mapped via the block device.  Since these pages could have journal heads
 689  * which would prevent try_to_free_buffers() from freeing them, we must use
 690  * jbd layer's try_to_free_buffers() function to release them.
 691  */
 692 static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
 693                                  gfp_t wait)
 694 {
 695         journal_t *journal = EXT3_SB(sb)->s_journal;
 696
 697         WARN_ON(PageChecked(page));
 698         if (!page_has_buffers(page))
 699                 return 0;
 700         if (journal)
 701                 return journal_try_to_free_buffers(journal, page,
 702                                                    wait & ~__GFP_WAIT);
 703         return try_to_free_buffers(page);
 704 }
 705
 706 #ifdef CONFIG_QUOTA
 707 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
 708 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
 709
 710 static int ext3_dquot_initialize(struct inode *inode, int type);
 711 static int ext3_dquot_drop(struct inode *inode);
 712 static int ext3_write_dquot(struct dquot *dquot);
 713 static int ext3_acquire_dquot(struct dquot *dquot);
 714 static int ext3_release_dquot(struct dquot *dquot);
 715 static int ext3_mark_dquot_dirty(struct dquot *dquot);
 716 static int ext3_write_info(struct super_block *sb, int type);
 717 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
 718                                 char *path, int remount);
 719 static int ext3_quota_on_mount(struct super_block *sb, int type);
 720 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
 721                                size_t len, loff_t off);
 722 static ssize_t ext3_quota_write(struct super_block *sb, int type,
 723                                 const char *data, size_t len, loff_t off);
 724
 725 static struct dquot_operations ext3_quota_operations = {
 726         .initialize     = ext3_dquot_initialize,
 727         .drop           = ext3_dquot_drop,
 728         .alloc_space    = dquot_alloc_space,
 729         .alloc_inode    = dquot_alloc_inode,
 730         .free_space     = dquot_free_space,
 731         .free_inode     = dquot_free_inode,
 732         .transfer       = dquot_transfer,
 733         .write_dquot    = ext3_write_dquot,
 734         .acquire_dquot  = ext3_acquire_dquot,
 735         .release_dquot  = ext3_release_dquot,
 736         .mark_dirty     = ext3_mark_dquot_dirty,
 737         .write_info     = ext3_write_info,
 738         .alloc_dquot    = dquot_alloc,
 739         .destroy_dquot  = dquot_destroy,
 740 };
 741
 742 static struct quotactl_ops ext3_qctl_operations = {
 743         .quota_on       = ext3_quota_on,
 744         .quota_off      = vfs_quota_off,
 745         .quota_sync     = vfs_quota_sync,
 746         .get_info       = vfs_get_dqinfo,
 747         .set_info       = vfs_set_dqinfo,
 748         .get_dqblk      = vfs_get_dqblk,
 749         .set_dqblk      = vfs_set_dqblk
 750 };
 751 #endif
 752
 753 static const struct super_operations ext3_sops = {
 754         .alloc_inode    = ext3_alloc_inode,
 755         .destroy_inode  = ext3_destroy_inode,
 756         .write_inode    = ext3_write_inode,
 757         .dirty_inode    = ext3_dirty_inode,
 758         .delete_inode   = ext3_delete_inode,
 759         .put_super      = ext3_put_super,
 760         .write_super    = ext3_write_super,
 761         .sync_fs        = ext3_sync_fs,
 762         .write_super_lockfs = ext3_write_super_lockfs,
 763         .unlockfs       = ext3_unlockfs,
 764         .statfs         = ext3_statfs,
 765         .remount_fs     = ext3_remount,
 766         .clear_inode    = ext3_clear_inode,
 767         .show_options   = ext3_show_options,
 768 #ifdef CONFIG_QUOTA
 769         .quota_read     = ext3_quota_read,
 770         .quota_write    = ext3_quota_write,
 771 #endif
 772         .bdev_try_to_free_page = bdev_try_to_free_page,
 773 };
 774
 775 static const struct export_operations ext3_export_ops = {
 776         .fh_to_dentry = ext3_fh_to_dentry,
 777         .fh_to_parent = ext3_fh_to_parent,
 778         .get_parent = ext3_get_parent,
 779 };
 780
 781 enum {
 782         Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
 783         Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
 784         Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
 785         Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
 786         Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
 787         Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
 788         Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
 789         Opt_data_err_abort, Opt_data_err_ignore,
 790         Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
 791         Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
 792         Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
 793         Opt_grpquota
 794 };
 795
 796 static const match_table_t tokens = {
 797         {Opt_bsd_df, "bsddf"},
 798         {Opt_minix_df, "minixdf"},
 799         {Opt_grpid, "grpid"},
 800         {Opt_grpid, "bsdgroups"},
 801         {Opt_nogrpid, "nogrpid"},
 802         {Opt_nogrpid, "sysvgroups"},
 803         {Opt_resgid, "resgid=%u"},
 804         {Opt_resuid, "resuid=%u"},
 805         {Opt_sb, "sb=%u"},
 806         {Opt_err_cont, "errors=continue"},
 807         {Opt_err_panic, "errors=panic"},
 808         {Opt_err_ro, "errors=remount-ro"},
 809         {Opt_nouid32, "nouid32"},
 810         {Opt_nocheck, "nocheck"},
 811         {Opt_nocheck, "check=none"},
 812         {Opt_debug, "debug"},
 813         {Opt_oldalloc, "oldalloc"},
 814         {Opt_orlov, "orlov"},
 815         {Opt_user_xattr, "user_xattr"},
 816         {Opt_nouser_xattr, "nouser_xattr"},
 817         {Opt_acl, "acl"},
 818         {Opt_noacl, "noacl"},
 819         {Opt_reservation, "reservation"},
 820         {Opt_noreservation, "noreservation"},
 821         {Opt_noload, "noload"},
 822         {Opt_nobh, "nobh"},
 823         {Opt_bh, "bh"},
 824         {Opt_commit, "commit=%u"},
 825         {Opt_journal_update, "journal=update"},
 826         {Opt_journal_inum, "journal=%u"},
 827         {Opt_journal_dev, "journal_dev=%u"},
 828         {Opt_abort, "abort"},
 829         {Opt_data_journal, "data=journal"},
 830         {Opt_data_ordered, "data=ordered"},
 831         {Opt_data_writeback, "data=writeback"},
 832         {Opt_data_err_abort, "data_err=abort"},
 833         {Opt_data_err_ignore, "data_err=ignore"},
 834         {Opt_offusrjquota, "usrjquota="},
 835         {Opt_usrjquota, "usrjquota=%s"},
 836         {Opt_offgrpjquota, "grpjquota="},
 837         {Opt_grpjquota, "grpjquota=%s"},
 838         {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
 839         {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
 840         {Opt_grpquota, "grpquota"},
 841         {Opt_noquota, "noquota"},
 842         {Opt_quota, "quota"},
 843         {Opt_usrquota, "usrquota"},
 844         {Opt_barrier, "barrier=%u"},
 845         {Opt_resize, "resize"},
 846         {Opt_err, NULL},
 847 };
 848
 849 static ext3_fsblk_t get_sb_block(void **data)
 850 {
 851         ext3_fsblk_t    sb_block;
 852         char            *options = (char *) *data;
 853
 854         if (!options || strncmp(options, "sb=", 3) != 0)
 855                 return 1;       /* Default location */
 856         options += 3;
 857         /*todo: use simple_strtoll with >32bit ext3 */
 858         sb_block = simple_strtoul(options, &options, 0);
 859         if (*options && *options != ',') {
 860                 printk("EXT3-fs: Invalid sb specification: %s\n",
 861                        (char *) *data);
 862                 return 1;
 863         }
 864         if (*options == ',')
 865                 options++;
 866         *data = (void *) options;
 867         return sb_block;
 868 }
 869
 870 static int parse_options (char *options, struct super_block *sb,
 871                           unsigned int *inum, unsigned long *journal_devnum,
 872                           ext3_fsblk_t *n_blocks_count, int is_remount)
 873 {
 874         struct ext3_sb_info *sbi = EXT3_SB(sb);
 875         char * p;
 876         substring_t args[MAX_OPT_ARGS];
 877         int data_opt = 0;
 878         int option;
 879 #ifdef CONFIG_QUOTA
 880         int qtype, qfmt;
 881         char *qname;
 882 #endif
 883
 884         if (!options)
 885                 return 1;
 886
 887         while ((p = strsep (&options, ",")) != NULL) {
 888                 int token;
 889                 if (!*p)
 890                         continue;
 891
 892                 token = match_token(p, tokens, args);
 893                 switch (token) {
 894                 case Opt_bsd_df:
 895                         clear_opt (sbi->s_mount_opt, MINIX_DF);
 896                         break;
 897                 case Opt_minix_df:
 898                         set_opt (sbi->s_mount_opt, MINIX_DF);
 899                         break;
 900                 case Opt_grpid:
 901                         set_opt (sbi->s_mount_opt, GRPID);
 902                         break;
 903                 case Opt_nogrpid:
 904                         clear_opt (sbi->s_mount_opt, GRPID);
 905                         break;
 906                 case Opt_resuid:
 907                         if (match_int(&args[0], &option))
 908                                 return 0;
 909                         sbi->s_resuid = option;
 910                         break;
 911                 case Opt_resgid:
 912                         if (match_int(&args[0], &option))
 913                                 return 0;
 914                         sbi->s_resgid = option;
 915                         break;
 916                 case Opt_sb:
 917                         /* handled by get_sb_block() instead of here */
 918                         /* *sb_block = match_int(&args[0]); */
 919                         break;
 920                 case Opt_err_panic:
 921                         clear_opt (sbi->s_mount_opt, ERRORS_CONT);
 922                         clear_opt (sbi->s_mount_opt, ERRORS_RO);
 923                         set_opt (sbi->s_mount_opt, ERRORS_PANIC);
 924                         break;
 925                 case Opt_err_ro:
 926                         clear_opt (sbi->s_mount_opt, ERRORS_CONT);
 927                         clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
 928                         set_opt (sbi->s_mount_opt, ERRORS_RO);
 929                         break;
 930                 case Opt_err_cont:
 931                         clear_opt (sbi->s_mount_opt, ERRORS_RO);
 932                         clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
 933                         set_opt (sbi->s_mount_opt, ERRORS_CONT);
 934                         break;
 935                 case Opt_nouid32:
 936                         set_opt (sbi->s_mount_opt, NO_UID32);
 937                         break;
 938                 case Opt_nocheck:
 939                         clear_opt (sbi->s_mount_opt, CHECK);
 940                         break;
 941                 case Opt_debug:
 942                         set_opt (sbi->s_mount_opt, DEBUG);
 943                         break;
 944                 case Opt_oldalloc:
 945                         set_opt (sbi->s_mount_opt, OLDALLOC);
 946                         break;
 947                 case Opt_orlov:
 948                         clear_opt (sbi->s_mount_opt, OLDALLOC);
 949                         break;
 950 #ifdef CONFIG_EXT3_FS_XATTR
 951                 case Opt_user_xattr:
 952                         set_opt (sbi->s_mount_opt, XATTR_USER);
 953                         break;
 954                 case Opt_nouser_xattr:
 955                         clear_opt (sbi->s_mount_opt, XATTR_USER);
 956                         break;
 957 #else
 958                 case Opt_user_xattr:
 959                 case Opt_nouser_xattr:
 960                         printk("EXT3 (no)user_xattr options not supported\n");
 961                         break;
 962 #endif
 963 #ifdef CONFIG_EXT3_FS_POSIX_ACL
 964                 case Opt_acl:
 965                         set_opt(sbi->s_mount_opt, POSIX_ACL);
 966                         break;
 967                 case Opt_noacl:
 968                         clear_opt(sbi->s_mount_opt, POSIX_ACL);
 969                         break;
 970 #else
 971                 case Opt_acl:
 972                 case Opt_noacl:
 973                         printk("EXT3 (no)acl options not supported\n");
 974                         break;
 975 #endif
 976                 case Opt_reservation:
 977                         set_opt(sbi->s_mount_opt, RESERVATION);
 978                         break;
 979                 case Opt_noreservation:
 980                         clear_opt(sbi->s_mount_opt, RESERVATION);
 981                         break;
 982                 case Opt_journal_update:
 983                         /* @@@ FIXME */
 984                         /* Eventually we will want to be able to create
 985                            a journal file here.  For now, only allow the
 986                            user to specify an existing inode to be the
 987                            journal file. */
 988                         if (is_remount) {
 989                                 printk(KERN_ERR "EXT3-fs: cannot specify "
 990                                        "journal on remount\n");
 991                                 return 0;
 992                         }
 993                         set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
 994                         break;
 995                 case Opt_journal_inum:
 996                         if (is_remount) {
 997                                 printk(KERN_ERR "EXT3-fs: cannot specify "
 998                                        "journal on remount\n");
 999                                 return 0;
1000                         }
1001                         if (match_int(&args[0], &option))
1002                                 return 0;
1003                         *inum = option;
1004                         break;
1005                 case Opt_journal_dev:
1006                         if (is_remount) {
1007                                 printk(KERN_ERR "EXT3-fs: cannot specify "
1008                                        "journal on remount\n");
1009                                 return 0;
1010                         }
1011                         if (match_int(&args[0], &option))
1012                                 return 0;
1013                         *journal_devnum = option;
1014                         break;
1015                 case Opt_noload:
1016                         set_opt (sbi->s_mount_opt, NOLOAD);
1017                         break;
1018                 case Opt_commit:
1019                         if (match_int(&args[0], &option))
1020                                 return 0;
1021                         if (option < 0)
1022                                 return 0;
1023                         if (option == 0)
1024                                 option = JBD_DEFAULT_MAX_COMMIT_AGE;
1025                         sbi->s_commit_interval = HZ * option;
1026                         break;
1027                 case Opt_data_journal:
1028                         data_opt = EXT3_MOUNT_JOURNAL_DATA;
1029                         goto datacheck;
1030                 case Opt_data_ordered:
1031                         data_opt = EXT3_MOUNT_ORDERED_DATA;
1032                         goto datacheck;
1033                 case Opt_data_writeback:
1034                         data_opt = EXT3_MOUNT_WRITEBACK_DATA;
1035                 datacheck:
1036                         if (is_remount) {
1037                                 if ((sbi->s_mount_opt & EXT3_MOUNT_DATA_FLAGS)
1038                                                 != data_opt) {
1039                                         printk(KERN_ERR
1040                                                 "EXT3-fs: cannot change data "
1041                                                 "mode on remount\n");
1042                                         return 0;
1043                                 }
1044                         } else {
1045                                 sbi->s_mount_opt &= ~EXT3_MOUNT_DATA_FLAGS;
1046                                 sbi->s_mount_opt |= data_opt;
1047                         }
1048                         break;
1049                 case Opt_data_err_abort:
1050                         set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1051                         break;
1052                 case Opt_data_err_ignore:
1053                         clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1054                         break;
1055 #ifdef CONFIG_QUOTA
1056                 case Opt_usrjquota:
1057                         qtype = USRQUOTA;
1058                         goto set_qf_name;
1059                 case Opt_grpjquota:
1060                         qtype = GRPQUOTA;
1061 set_qf_name:
1062                         if (sb_any_quota_loaded(sb) &&
1063                             !sbi->s_qf_names[qtype]) {
1064                                 printk(KERN_ERR
1065                                         "EXT3-fs: Cannot change journaled "
1066                                         "quota options when quota turned on.\n");
1067                                 return 0;
1068                         }
1069                         qname = match_strdup(&args[0]);
1070                         if (!qname) {
1071                                 printk(KERN_ERR
1072                                         "EXT3-fs: not enough memory for "
1073                                         "storing quotafile name.\n");
1074                                 return 0;
1075                         }
1076                         if (sbi->s_qf_names[qtype] &&
1077                             strcmp(sbi->s_qf_names[qtype], qname)) {
1078                                 printk(KERN_ERR
1079                                         "EXT3-fs: %s quota file already "
1080                                         "specified.\n", QTYPE2NAME(qtype));
1081                                 kfree(qname);
1082                                 return 0;
1083                         }
1084                         sbi->s_qf_names[qtype] = qname;
1085                         if (strchr(sbi->s_qf_names[qtype], '/')) {
1086                                 printk(KERN_ERR
1087                                         "EXT3-fs: quotafile must be on "
1088                                         "filesystem root.\n");
1089                                 kfree(sbi->s_qf_names[qtype]);
1090                                 sbi->s_qf_names[qtype] = NULL;
1091                                 return 0;
1092                         }
1093                         set_opt(sbi->s_mount_opt, QUOTA);
1094                         break;
1095                 case Opt_offusrjquota:
1096                         qtype = USRQUOTA;
1097                         goto clear_qf_name;
1098                 case Opt_offgrpjquota:
1099                         qtype = GRPQUOTA;
1100 clear_qf_name:
1101                         if (sb_any_quota_loaded(sb) &&
1102                             sbi->s_qf_names[qtype]) {
1103                                 printk(KERN_ERR "EXT3-fs: Cannot change "
1104                                         "journaled quota options when "
1105                                         "quota turned on.\n");
1106                                 return 0;
1107                         }
1108                         /*
1109                          * The space will be released later when all options
1110                          * are confirmed to be correct
1111                          */
1112                         sbi->s_qf_names[qtype] = NULL;
1113                         break;
1114                 case Opt_jqfmt_vfsold:
1115                         qfmt = QFMT_VFS_OLD;
1116                         goto set_qf_format;
1117                 case Opt_jqfmt_vfsv0:
1118                         qfmt = QFMT_VFS_V0;
1119 set_qf_format:
1120                         if (sb_any_quota_loaded(sb) &&
1121                             sbi->s_jquota_fmt != qfmt) {
1122                                 printk(KERN_ERR "EXT3-fs: Cannot change "
1123                                         "journaled quota options when "
1124                                         "quota turned on.\n");
1125                                 return 0;
1126                         }
1127                         sbi->s_jquota_fmt = qfmt;
1128                         break;
1129                 case Opt_quota:
1130                 case Opt_usrquota:
1131                         set_opt(sbi->s_mount_opt, QUOTA);
1132                         set_opt(sbi->s_mount_opt, USRQUOTA);
1133                         break;
1134                 case Opt_grpquota:
1135                         set_opt(sbi->s_mount_opt, QUOTA);
1136                         set_opt(sbi->s_mount_opt, GRPQUOTA);
1137                         break;
1138                 case Opt_noquota:
1139                         if (sb_any_quota_loaded(sb)) {
1140                                 printk(KERN_ERR "EXT3-fs: Cannot change quota "
1141                                         "options when quota turned on.\n");
1142                                 return 0;
1143                         }
1144                         clear_opt(sbi->s_mount_opt, QUOTA);
1145                         clear_opt(sbi->s_mount_opt, USRQUOTA);
1146                         clear_opt(sbi->s_mount_opt, GRPQUOTA);
1147                         break;
1148 #else
1149                 case Opt_quota:
1150                 case Opt_usrquota:
1151                 case Opt_grpquota:
1152                         printk(KERN_ERR
1153                                 "EXT3-fs: quota options not supported.\n");
1154                         break;
1155                 case Opt_usrjquota:
1156                 case Opt_grpjquota:
1157                 case Opt_offusrjquota:
1158                 case Opt_offgrpjquota:
1159                 case Opt_jqfmt_vfsold:
1160                 case Opt_jqfmt_vfsv0:
1161                         printk(KERN_ERR
1162                                 "EXT3-fs: journaled quota options not "
1163                                 "supported.\n");
1164                         break;
1165                 case Opt_noquota:
1166                         break;
1167 #endif
1168                 case Opt_abort:
1169                         set_opt(sbi->s_mount_opt, ABORT);
1170                         break;
1171                 case Opt_barrier:
1172                         if (match_int(&args[0], &option))
1173                                 return 0;
1174                         if (option)
1175                                 set_opt(sbi->s_mount_opt, BARRIER);
1176                         else
1177                                 clear_opt(sbi->s_mount_opt, BARRIER);
1178                         break;
1179                 case Opt_ignore:
1180                         break;
1181                 case Opt_resize:
1182                         if (!is_remount) {
1183                                 printk("EXT3-fs: resize option only available "
1184                                         "for remount\n");
1185                                 return 0;
1186                         }
1187                         if (match_int(&args[0], &option) != 0)
1188                                 return 0;
1189                         *n_blocks_count = option;
1190                         break;
1191                 case Opt_nobh:
1192                         set_opt(sbi->s_mount_opt, NOBH);
1193                         break;
1194                 case Opt_bh:
1195                         clear_opt(sbi->s_mount_opt, NOBH);
1196                         break;
1197                 default:
1198                         printk (KERN_ERR
1199                                 "EXT3-fs: Unrecognized mount option \"%s\" "
1200                                 "or missing value\n", p);
1201                         return 0;
1202                 }
1203         }
1204 #ifdef CONFIG_QUOTA
1205         if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1206                 if ((sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA) &&
1207                      sbi->s_qf_names[USRQUOTA])
1208                         clear_opt(sbi->s_mount_opt, USRQUOTA);
1209
1210                 if ((sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA) &&
1211                      sbi->s_qf_names[GRPQUOTA])
1212                         clear_opt(sbi->s_mount_opt, GRPQUOTA);
1213
1214                 if ((sbi->s_qf_names[USRQUOTA] &&
1215                                 (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)) ||
1216                     (sbi->s_qf_names[GRPQUOTA] &&
1217                                 (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA))) {
1218                         printk(KERN_ERR "EXT3-fs: old and new quota "
1219                                         "format mixing.\n");
1220                         return 0;
1221                 }
1222
1223                 if (!sbi->s_jquota_fmt) {
1224                         printk(KERN_ERR "EXT3-fs: journaled quota format "
1225                                         "not specified.\n");
1226                         return 0;
1227                 }
1228         } else {
1229                 if (sbi->s_jquota_fmt) {
1230                         printk(KERN_ERR "EXT3-fs: journaled quota format "
1231                                         "specified with no journaling "
1232                                         "enabled.\n");
1233                         return 0;
1234                 }
1235         }
1236 #endif
1237         return 1;
1238 }
1239
1240 static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1241                             int read_only)
1242 {
1243         struct ext3_sb_info *sbi = EXT3_SB(sb);
1244         int res = 0;
1245
1246         if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
1247                 printk (KERN_ERR "EXT3-fs warning: revision level too high, "
1248                         "forcing read-only mode\n");
1249                 res = MS_RDONLY;
1250         }
1251         if (read_only)
1252                 return res;
1253         if (!(sbi->s_mount_state & EXT3_VALID_FS))
1254                 printk (KERN_WARNING "EXT3-fs warning: mounting unchecked fs, "
1255                         "running e2fsck is recommended\n");
1256         else if ((sbi->s_mount_state & EXT3_ERROR_FS))
1257                 printk (KERN_WARNING
1258                         "EXT3-fs warning: mounting fs with errors, "
1259                         "running e2fsck is recommended\n");
1260         else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1261                  le16_to_cpu(es->s_mnt_count) >=
1262                  (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1263                 printk (KERN_WARNING
1264                         "EXT3-fs warning: maximal mount count reached, "
1265                         "running e2fsck is recommended\n");
1266         else if (le32_to_cpu(es->s_checkinterval) &&
1267                 (le32_to_cpu(es->s_lastcheck) +
1268                         le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1269                 printk (KERN_WARNING
1270                         "EXT3-fs warning: checktime reached, "
1271                         "running e2fsck is recommended\n");
1272 #if 0
1273                 /* @@@ We _will_ want to clear the valid bit if we find
1274                    inconsistencies, to force a fsck at reboot.  But for
1275                    a plain journaled filesystem we can keep it set as
1276                    valid forever! :) */
1277         es->s_state &= cpu_to_le16(~EXT3_VALID_FS);
1278 #endif
1279         if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1280                 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
1281         le16_add_cpu(&es->s_mnt_count, 1);
1282         es->s_mtime = cpu_to_le32(get_seconds());
1283         ext3_update_dynamic_rev(sb);
1284         EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1285
1286         ext3_commit_super(sb, es, 1);
1287         if (test_opt(sb, DEBUG))
1288                 printk(KERN_INFO "[EXT3 FS bs=%lu, gc=%lu, "
1289                                 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1290                         sb->s_blocksize,
1291                         sbi->s_groups_count,
1292                         EXT3_BLOCKS_PER_GROUP(sb),
1293                         EXT3_INODES_PER_GROUP(sb),
1294                         sbi->s_mount_opt);
1295
1296         printk(KERN_INFO "EXT3 FS on %s, ", sb->s_id);
1297         if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1298                 char b[BDEVNAME_SIZE];
1299
1300                 printk("external journal on %s\n",
1301                         bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1302         } else {
1303                 printk("internal journal\n");
1304         }
1305         return res;
1306 }
1307
1308 /* Called at mount-time, super-block is locked */
1309 static int ext3_check_descriptors(struct super_block *sb)
1310 {
1311         struct ext3_sb_info *sbi = EXT3_SB(sb);
1312         int i;
1313
1314         ext3_debug ("Checking group descriptors");
1315
1316         for (i = 0; i < sbi->s_groups_count; i++) {
1317                 struct ext3_group_desc *gdp = ext3_get_group_desc(sb, i, NULL);
1318                 ext3_fsblk_t first_block = ext3_group_first_block_no(sb, i);
1319                 ext3_fsblk_t last_block;
1320
1321                 if (i == sbi->s_groups_count - 1)
1322                         last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
1323                 else
1324                         last_block = first_block +
1325                                 (EXT3_BLOCKS_PER_GROUP(sb) - 1);
1326
1327                 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
1328                     le32_to_cpu(gdp->bg_block_bitmap) > last_block)
1329                 {
1330                         ext3_error (sb, "ext3_check_descriptors",
1331                                     "Block bitmap for group %d"
1332                                     " not in group (block %lu)!",
1333                                     i, (unsigned long)
1334                                         le32_to_cpu(gdp->bg_block_bitmap));
1335                         return 0;
1336                 }
1337                 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
1338                     le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
1339                 {
1340                         ext3_error (sb, "ext3_check_descriptors",
1341                                     "Inode bitmap for group %d"
1342                                     " not in group (block %lu)!",
1343                                     i, (unsigned long)
1344                                         le32_to_cpu(gdp->bg_inode_bitmap));
1345                         return 0;
1346                 }
1347                 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
1348                     le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
1349                     last_block)
1350                 {
1351                         ext3_error (sb, "ext3_check_descriptors",
1352                                     "Inode table for group %d"
1353                                     " not in group (block %lu)!",
1354                                     i, (unsigned long)
1355                                         le32_to_cpu(gdp->bg_inode_table));
1356                         return 0;
1357                 }
1358         }
1359
1360         sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1361         sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1362         return 1;
1363 }
1364
1365
1366 /* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1367  * the superblock) which were deleted from all directories, but held open by
1368  * a process at the time of a crash.  We walk the list and try to delete these
1369  * inodes at recovery time (only with a read-write filesystem).
1370  *
1371  * In order to keep the orphan inode chain consistent during traversal (in
1372  * case of crash during recovery), we link each inode into the superblock
1373  * orphan list_head and handle it the same way as an inode deletion during
1374  * normal operation (which journals the operations for us).
1375  *
1376  * We only do an iget() and an iput() on each inode, which is very safe if we
1377  * accidentally point at an in-use or already deleted inode.  The worst that
1378  * can happen in this case is that we get a "bit already cleared" message from
1379  * ext3_free_inode().  The only reason we would point at a wrong inode is if
1380  * e2fsck was run on this filesystem, and it must have already done the orphan
1381  * inode cleanup for us, so we can safely abort without any further action.
1382  */
1383 static void ext3_orphan_cleanup (struct super_block * sb,
1384                                  struct ext3_super_block * es)
1385 {
1386         unsigned int s_flags = sb->s_flags;
1387         int nr_orphans = 0, nr_truncates = 0;
1388 #ifdef CONFIG_QUOTA
1389         int i;
1390 #endif
1391         if (!es->s_last_orphan) {
1392                 jbd_debug(4, "no orphan inodes to clean up\n");
1393                 return;
1394         }
1395
1396         if (bdev_read_only(sb->s_bdev)) {
1397                 printk(KERN_ERR "EXT3-fs: write access "
1398                         "unavailable, skipping orphan cleanup.\n");
1399                 return;
1400         }
1401
1402         if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1403                 if (es->s_last_orphan)
1404                         jbd_debug(1, "Errors on filesystem, "
1405                                   "clearing orphan list.\n");
1406                 es->s_last_orphan = 0;
1407                 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1408                 return;
1409         }
1410
1411         if (s_flags & MS_RDONLY) {
1412                 printk(KERN_INFO "EXT3-fs: %s: orphan cleanup on readonly fs\n",
1413                        sb->s_id);
1414                 sb->s_flags &= ~MS_RDONLY;
1415         }
1416 #ifdef CONFIG_QUOTA
1417         /* Needed for iput() to work correctly and not trash data */
1418         sb->s_flags |= MS_ACTIVE;
1419         /* Turn on quotas so that they are updated correctly */
1420         for (i = 0; i < MAXQUOTAS; i++) {
1421                 if (EXT3_SB(sb)->s_qf_names[i]) {
1422                         int ret = ext3_quota_on_mount(sb, i);
1423                         if (ret < 0)
1424                                 printk(KERN_ERR
1425                                         "EXT3-fs: Cannot turn on journaled "
1426                                         "quota: error %d\n", ret);
1427                 }
1428         }
1429 #endif
1430
1431         while (es->s_last_orphan) {
1432                 struct inode *inode;
1433
1434                 inode = ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1435                 if (IS_ERR(inode)) {
1436                         es->s_last_orphan = 0;
1437                         break;
1438                 }
1439
1440                 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1441                 DQUOT_INIT(inode);
1442                 if (inode->i_nlink) {
1443                         printk(KERN_DEBUG
1444                                 "%s: truncating inode %lu to %Ld bytes\n",
1445                                 __func__, inode->i_ino, inode->i_size);
1446                         jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1447                                   inode->i_ino, inode->i_size);
1448                         ext3_truncate(inode);
1449                         nr_truncates++;
1450                 } else {
1451                         printk(KERN_DEBUG
1452                                 "%s: deleting unreferenced inode %lu\n",
1453                                 __func__, inode->i_ino);
1454                         jbd_debug(2, "deleting unreferenced inode %lu\n",
1455                                   inode->i_ino);
1456                         nr_orphans++;
1457                 }
1458                 iput(inode);  /* The delete magic happens here! */
1459         }
1460
1461 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1462
1463         if (nr_orphans)
1464                 printk(KERN_INFO "EXT3-fs: %s: %d orphan inode%s deleted\n",
1465                        sb->s_id, PLURAL(nr_orphans));
1466         if (nr_truncates)
1467                 printk(KERN_INFO "EXT3-fs: %s: %d truncate%s cleaned up\n",
1468                        sb->s_id, PLURAL(nr_truncates));
1469 #ifdef CONFIG_QUOTA
1470         /* Turn quotas off */
1471         for (i = 0; i < MAXQUOTAS; i++) {
1472                 if (sb_dqopt(sb)->files[i])
1473                         vfs_quota_off(sb, i, 0);
1474         }
1475 #endif
1476         sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1477 }
1478
1479 /*
1480  * Maximal file size.  There is a direct, and {,double-,triple-}indirect
1481  * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1482  * We need to be 1 filesystem block less than the 2^32 sector limit.
1483  */
1484 static loff_t ext3_max_size(int bits)
1485 {
1486         loff_t res = EXT3_NDIR_BLOCKS;
1487         int meta_blocks;
1488         loff_t upper_limit;
1489
1490         /* This is calculated to be the largest file size for a
1491          * dense, file such that the total number of
1492          * sectors in the file, including data and all indirect blocks,
1493          * does not exceed 2^32 -1
1494          * __u32 i_blocks representing the total number of
1495          * 512 bytes blocks of the file
1496          */
1497         upper_limit = (1LL << 32) - 1;
1498
1499         /* total blocks in file system block size */
1500         upper_limit >>= (bits - 9);
1501
1502
1503         /* indirect blocks */
1504         meta_blocks = 1;
1505         /* double indirect blocks */
1506         meta_blocks += 1 + (1LL << (bits-2));
1507         /* tripple indirect blocks */
1508         meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1509
1510         upper_limit -= meta_blocks;
1511         upper_limit <<= bits;
1512
1513         res += 1LL << (bits-2);
1514         res += 1LL << (2*(bits-2));
1515         res += 1LL << (3*(bits-2));
1516         res <<= bits;
1517         if (res > upper_limit)
1518                 res = upper_limit;
1519
1520         if (res > MAX_LFS_FILESIZE)
1521                 res = MAX_LFS_FILESIZE;
1522
1523         return res;
1524 }
1525
1526 static ext3_fsblk_t descriptor_loc(struct super_block *sb,
1527                                     ext3_fsblk_t logic_sb_block,
1528                                     int nr)
1529 {
1530         struct ext3_sb_info *sbi = EXT3_SB(sb);
1531         unsigned long bg, first_meta_bg;
1532         int has_super = 0;
1533
1534         first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1535
1536         if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1537             nr < first_meta_bg)
1538                 return (logic_sb_block + nr + 1);
1539         bg = sbi->s_desc_per_block * nr;
1540         if (ext3_bg_has_super(sb, bg))
1541                 has_super = 1;
1542         return (has_super + ext3_group_first_block_no(sb, bg));
1543 }
1544
1545
1546 static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1547 {
1548         struct buffer_head * bh;
1549         struct ext3_super_block *es = NULL;
1550         struct ext3_sb_info *sbi;
1551         ext3_fsblk_t block;
1552         ext3_fsblk_t sb_block = get_sb_block(&data);
1553         ext3_fsblk_t logic_sb_block;
1554         unsigned long offset = 0;
1555         unsigned int journal_inum = 0;
1556         unsigned long journal_devnum = 0;
1557         unsigned long def_mount_opts;
1558         struct inode *root;
1559         int blocksize;
1560         int hblock;
1561         int db_count;
1562         int i;
1563         int needs_recovery;
1564         int ret = -EINVAL;
1565         __le32 features;
1566         int err;
1567
1568         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1569         if (!sbi)
1570                 return -ENOMEM;
1571
1572         sbi->s_blockgroup_lock =
1573                 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
1574         if (!sbi->s_blockgroup_lock) {
1575                 kfree(sbi);
1576                 return -ENOMEM;
1577         }
1578         sb->s_fs_info = sbi;
1579         sbi->s_mount_opt = 0;
1580         sbi->s_resuid = EXT3_DEF_RESUID;
1581         sbi->s_resgid = EXT3_DEF_RESGID;
1582         sbi->s_sb_block = sb_block;
1583
1584         unlock_kernel();
1585
1586         blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1587         if (!blocksize) {
1588                 printk(KERN_ERR "EXT3-fs: unable to set blocksize\n");
1589                 goto out_fail;
1590         }
1591
1592         /*
1593          * The ext3 superblock will not be buffer aligned for other than 1kB
1594          * block sizes.  We need to calculate the offset from buffer start.
1595          */
1596         if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1597                 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1598                 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1599         } else {
1600                 logic_sb_block = sb_block;
1601         }
1602
1603         if (!(bh = sb_bread(sb, logic_sb_block))) {
1604                 printk (KERN_ERR "EXT3-fs: unable to read superblock\n");
1605                 goto out_fail;
1606         }
1607         /*
1608          * Note: s_es must be initialized as soon as possible because
1609          *       some ext3 macro-instructions depend on its value
1610          */
1611         es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1612         sbi->s_es = es;
1613         sb->s_magic = le16_to_cpu(es->s_magic);
1614         if (sb->s_magic != EXT3_SUPER_MAGIC)
1615                 goto cantfind_ext3;
1616
1617         /* Set defaults before we parse the mount options */
1618         def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1619         if (def_mount_opts & EXT3_DEFM_DEBUG)
1620                 set_opt(sbi->s_mount_opt, DEBUG);
1621         if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1622                 set_opt(sbi->s_mount_opt, GRPID);
1623         if (def_mount_opts & EXT3_DEFM_UID16)
1624                 set_opt(sbi->s_mount_opt, NO_UID32);
1625 #ifdef CONFIG_EXT3_FS_XATTR
1626         if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1627                 set_opt(sbi->s_mount_opt, XATTR_USER);
1628 #endif
1629 #ifdef CONFIG_EXT3_FS_POSIX_ACL
1630         if (def_mount_opts & EXT3_DEFM_ACL)
1631                 set_opt(sbi->s_mount_opt, POSIX_ACL);
1632 #endif
1633         if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1634                 sbi->s_mount_opt |= EXT3_MOUNT_JOURNAL_DATA;
1635         else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1636                 sbi->s_mount_opt |= EXT3_MOUNT_ORDERED_DATA;
1637         else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1638                 sbi->s_mount_opt |= EXT3_MOUNT_WRITEBACK_DATA;
1639
1640         if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1641                 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1642         else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_CONTINUE)
1643                 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1644         else
1645                 set_opt(sbi->s_mount_opt, ERRORS_RO);
1646
1647         sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1648         sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1649
1650         set_opt(sbi->s_mount_opt, RESERVATION);
1651
1652         if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1653                             NULL, 0))
1654                 goto failed_mount;
1655
1656         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1657                 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1658
1659         if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1660             (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1661              EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1662              EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1663                 printk(KERN_WARNING
1664                        "EXT3-fs warning: feature flags set on rev 0 fs, "
1665                        "running e2fsck is recommended\n");
1666         /*
1667          * Check feature flags regardless of the revision level, since we
1668          * previously didn't change the revision level when setting the flags,
1669          * so there is a chance incompat flags are set on a rev 0 filesystem.
1670          */
1671         features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1672         if (features) {
1673                 printk(KERN_ERR "EXT3-fs: %s: couldn't mount because of "
1674                        "unsupported optional features (%x).\n",
1675                        sb->s_id, le32_to_cpu(features));
1676                 goto failed_mount;
1677         }
1678         features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1679         if (!(sb->s_flags & MS_RDONLY) && features) {
1680                 printk(KERN_ERR "EXT3-fs: %s: couldn't mount RDWR because of "
1681                        "unsupported optional features (%x).\n",
1682                        sb->s_id, le32_to_cpu(features));
1683                 goto failed_mount;
1684         }
1685         blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1686
1687         if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1688             blocksize > EXT3_MAX_BLOCK_SIZE) {
1689                 printk(KERN_ERR
1690                        "EXT3-fs: Unsupported filesystem blocksize %d on %s.\n",
1691                        blocksize, sb->s_id);
1692                 goto failed_mount;
1693         }
1694
1695         hblock = bdev_hardsect_size(sb->s_bdev);
1696         if (sb->s_blocksize != blocksize) {
1697                 /*
1698                  * Make sure the blocksize for the filesystem is larger
1699                  * than the hardware sectorsize for the machine.
1700                  */
1701                 if (blocksize < hblock) {
1702                         printk(KERN_ERR "EXT3-fs: blocksize %d too small for "
1703                                "device blocksize %d.\n", blocksize, hblock);
1704                         goto failed_mount;
1705                 }
1706
1707                 brelse (bh);
1708                 if (!sb_set_blocksize(sb, blocksize)) {
1709                         printk(KERN_ERR "EXT3-fs: bad blocksize %d.\n",
1710                                 blocksize);
1711                         goto out_fail;
1712                 }
1713                 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1714                 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1715                 bh = sb_bread(sb, logic_sb_block);
1716                 if (!bh) {
1717                         printk(KERN_ERR
1718                                "EXT3-fs: Can't read superblock on 2nd try.\n");
1719                         goto failed_mount;
1720                 }
1721                 es = (struct ext3_super_block *)(((char *)bh->b_data) + offset);
1722                 sbi->s_es = es;
1723                 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
1724                         printk (KERN_ERR
1725                                 "EXT3-fs: Magic mismatch, very weird !\n");
1726                         goto failed_mount;
1727                 }
1728         }
1729
1730         sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1731
1732         if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1733                 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1734                 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1735         } else {
1736                 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1737                 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1738                 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
1739                     (!is_power_of_2(sbi->s_inode_size)) ||
1740                     (sbi->s_inode_size > blocksize)) {
1741                         printk (KERN_ERR
1742                                 "EXT3-fs: unsupported inode size: %d\n",
1743                                 sbi->s_inode_size);
1744                         goto failed_mount;
1745                 }
1746         }
1747         sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1748                                    le32_to_cpu(es->s_log_frag_size);
1749         if (blocksize != sbi->s_frag_size) {
1750                 printk(KERN_ERR
1751                        "EXT3-fs: fragsize %lu != blocksize %u (unsupported)\n",
1752                        sbi->s_frag_size, blocksize);
1753                 goto failed_mount;
1754         }
1755         sbi->s_frags_per_block = 1;
1756         sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1757         sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1758         sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1759         if (EXT3_INODE_SIZE(sb) == 0 || EXT3_INODES_PER_GROUP(sb) == 0)
1760                 goto cantfind_ext3;
1761         sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1762         if (sbi->s_inodes_per_block == 0)
1763                 goto cantfind_ext3;
1764         sbi->s_itb_per_group = sbi->s_inodes_per_group /
1765                                         sbi->s_inodes_per_block;
1766         sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1767         sbi->s_sbh = bh;
1768         sbi->s_mount_state = le16_to_cpu(es->s_state);
1769         sbi->s_addr_per_block_bits = ilog2(EXT3_ADDR_PER_BLOCK(sb));
1770         sbi->s_desc_per_block_bits = ilog2(EXT3_DESC_PER_BLOCK(sb));
1771         for (i=0; i < 4; i++)
1772                 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1773         sbi->s_def_hash_version = es->s_def_hash_version;
1774         i = le32_to_cpu(es->s_flags);
1775         if (i & EXT2_FLAGS_UNSIGNED_HASH)
1776                 sbi->s_hash_unsigned = 3;
1777         else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
1778 #ifdef __CHAR_UNSIGNED__
1779                 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
1780                 sbi->s_hash_unsigned = 3;
1781 #else
1782                 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
1783 #endif
1784                 sb->s_dirt = 1;
1785         }
1786
1787         if (sbi->s_blocks_per_group > blocksize * 8) {
1788                 printk (KERN_ERR
1789                         "EXT3-fs: #blocks per group too big: %lu\n",
1790                         sbi->s_blocks_per_group);
1791                 goto failed_mount;
1792         }
1793         if (sbi->s_frags_per_group > blocksize * 8) {
1794                 printk (KERN_ERR
1795                         "EXT3-fs: #fragments per group too big: %lu\n",
1796                         sbi->s_frags_per_group);
1797                 goto failed_mount;
1798         }
1799         if (sbi->s_inodes_per_group > blocksize * 8) {
1800                 printk (KERN_ERR
1801                         "EXT3-fs: #inodes per group too big: %lu\n",
1802                         sbi->s_inodes_per_group);
1803                 goto failed_mount;
1804         }
1805
1806         if (le32_to_cpu(es->s_blocks_count) >
1807                     (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
1808                 printk(KERN_ERR "EXT3-fs: filesystem on %s:"
1809                         " too large to mount safely\n", sb->s_id);
1810                 if (sizeof(sector_t) < 8)
1811                         printk(KERN_WARNING "EXT3-fs: CONFIG_LBD not "
1812                                         "enabled\n");
1813                 goto failed_mount;
1814         }
1815
1816         if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1817                 goto cantfind_ext3;
1818         sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1819                                le32_to_cpu(es->s_first_data_block) - 1)
1820                                        / EXT3_BLOCKS_PER_GROUP(sb)) + 1;
1821         db_count = (sbi->s_groups_count + EXT3_DESC_PER_BLOCK(sb) - 1) /
1822                    EXT3_DESC_PER_BLOCK(sb);
1823         sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1824                                     GFP_KERNEL);
1825         if (sbi->s_group_desc == NULL) {
1826                 printk (KERN_ERR "EXT3-fs: not enough memory\n");
1827                 goto failed_mount;
1828         }
1829
1830         bgl_lock_init(sbi->s_blockgroup_lock);
1831
1832         for (i = 0; i < db_count; i++) {
1833                 block = descriptor_loc(sb, logic_sb_block, i);
1834                 sbi->s_group_desc[i] = sb_bread(sb, block);
1835                 if (!sbi->s_group_desc[i]) {
1836                         printk (KERN_ERR "EXT3-fs: "
1837                                 "can't read group descriptor %d\n", i);
1838                         db_count = i;
1839                         goto failed_mount2;
1840                 }
1841         }
1842         if (!ext3_check_descriptors (sb)) {
1843                 printk(KERN_ERR "EXT3-fs: group descriptors corrupted!\n");
1844                 goto failed_mount2;
1845         }
1846         sbi->s_gdb_count = db_count;
1847         get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1848         spin_lock_init(&sbi->s_next_gen_lock);
1849
1850         err = percpu_counter_init(&sbi->s_freeblocks_counter,
1851                         ext3_count_free_blocks(sb));
1852         if (!err) {
1853                 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1854                                 ext3_count_free_inodes(sb));
1855         }
1856         if (!err) {
1857                 err = percpu_counter_init(&sbi->s_dirs_counter,
1858                                 ext3_count_dirs(sb));
1859         }
1860         if (err) {
1861                 printk(KERN_ERR "EXT3-fs: insufficient memory\n");
1862                 goto failed_mount3;
1863         }
1864
1865         /* per fileystem reservation list head & lock */
1866         spin_lock_init(&sbi->s_rsv_window_lock);
1867         sbi->s_rsv_window_root = RB_ROOT;
1868         /* Add a single, static dummy reservation to the start of the
1869          * reservation window list --- it gives us a placeholder for
1870          * append-at-start-of-list which makes the allocation logic
1871          * _much_ simpler. */
1872         sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1873         sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1874         sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1875         sbi->s_rsv_window_head.rsv_goal_size = 0;
1876         ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1877
1878         /*
1879          * set up enough so that it can read an inode
1880          */
1881         sb->s_op = &ext3_sops;
1882         sb->s_export_op = &ext3_export_ops;
1883         sb->s_xattr = ext3_xattr_handlers;
1884 #ifdef CONFIG_QUOTA
1885         sb->s_qcop = &ext3_qctl_operations;
1886         sb->dq_op = &ext3_quota_operations;
1887 #endif
1888         INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1889
1890         sb->s_root = NULL;
1891
1892         needs_recovery = (es->s_last_orphan != 0 ||
1893                           EXT3_HAS_INCOMPAT_FEATURE(sb,
1894                                     EXT3_FEATURE_INCOMPAT_RECOVER));
1895
1896         /*
1897          * The first inode we look at is the journal inode.  Don't try
1898          * root first: it may be modified in the journal!
1899          */
1900         if (!test_opt(sb, NOLOAD) &&
1901             EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
1902                 if (ext3_load_journal(sb, es, journal_devnum))
1903                         goto failed_mount3;
1904         } else if (journal_inum) {
1905                 if (ext3_create_journal(sb, es, journal_inum))
1906                         goto failed_mount3;
1907         } else {
1908                 if (!silent)
1909                         printk (KERN_ERR
1910                                 "ext3: No journal on filesystem on %s\n",
1911                                 sb->s_id);
1912                 goto failed_mount3;
1913         }
1914
1915         /* We have now updated the journal if required, so we can
1916          * validate the data journaling mode. */
1917         switch (test_opt(sb, DATA_FLAGS)) {
1918         case 0:
1919                 /* No mode set, assume a default based on the journal
1920                    capabilities: ORDERED_DATA if the journal can
1921                    cope, else JOURNAL_DATA */
1922                 if (journal_check_available_features
1923                     (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
1924                         set_opt(sbi->s_mount_opt, ORDERED_DATA);
1925                 else
1926                         set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1927                 break;
1928
1929         case EXT3_MOUNT_ORDERED_DATA:
1930         case EXT3_MOUNT_WRITEBACK_DATA:
1931                 if (!journal_check_available_features
1932                     (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
1933                         printk(KERN_ERR "EXT3-fs: Journal does not support "
1934                                "requested data journaling mode\n");
1935                         goto failed_mount4;
1936                 }
1937         default:
1938                 break;
1939         }
1940
1941         if (test_opt(sb, NOBH)) {
1942                 if (!(test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)) {
1943                         printk(KERN_WARNING "EXT3-fs: Ignoring nobh option - "
1944                                 "its supported only with writeback mode\n");
1945                         clear_opt(sbi->s_mount_opt, NOBH);
1946                 }
1947         }
1948         /*
1949          * The journal_load will have done any necessary log recovery,
1950          * so we can safely mount the rest of the filesystem now.
1951          */
1952
1953         root = ext3_iget(sb, EXT3_ROOT_INO);
1954         if (IS_ERR(root)) {
1955                 printk(KERN_ERR "EXT3-fs: get root inode failed\n");
1956                 ret = PTR_ERR(root);
1957                 goto failed_mount4;
1958         }
1959         if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1960                 iput(root);
1961                 printk(KERN_ERR "EXT3-fs: corrupt root inode, run e2fsck\n");
1962                 goto failed_mount4;
1963         }
1964         sb->s_root = d_alloc_root(root);
1965         if (!sb->s_root) {
1966                 printk(KERN_ERR "EXT3-fs: get root dentry failed\n");
1967                 iput(root);
1968                 ret = -ENOMEM;
1969                 goto failed_mount4;
1970         }
1971
1972         ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
1973         /*
1974          * akpm: core read_super() calls in here with the superblock locked.
1975          * That deadlocks, because orphan cleanup needs to lock the superblock
1976          * in numerous places.  Here we just pop the lock - it's relatively
1977          * harmless, because we are now ready to accept write_super() requests,
1978          * and aviro says that's the only reason for hanging onto the
1979          * superblock lock.
1980          */
1981         EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
1982         ext3_orphan_cleanup(sb, es);
1983         EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
1984         if (needs_recovery)
1985                 printk (KERN_INFO "EXT3-fs: recovery complete.\n");
1986         ext3_mark_recovery_complete(sb, es);
1987         printk (KERN_INFO "EXT3-fs: mounted filesystem with %s data mode.\n",
1988                 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
1989                 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
1990                 "writeback");
1991
1992         lock_kernel();
1993         return 0;
1994
1995 cantfind_ext3:
1996         if (!silent)
1997                 printk(KERN_ERR "VFS: Can't find ext3 filesystem on dev %s.\n",
1998                        sb->s_id);
1999         goto failed_mount;
2000
2001 failed_mount4:
2002         journal_destroy(sbi->s_journal);
2003 failed_mount3:
2004         percpu_counter_destroy(&sbi->s_freeblocks_counter);
2005         percpu_counter_destroy(&sbi->s_freeinodes_counter);
2006         percpu_counter_destroy(&sbi->s_dirs_counter);
2007 failed_mount2:
2008         for (i = 0; i < db_count; i++)
2009                 brelse(sbi->s_group_desc[i]);
2010         kfree(sbi->s_group_desc);
2011 failed_mount:
2012 #ifdef CONFIG_QUOTA
2013         for (i = 0; i < MAXQUOTAS; i++)
2014                 kfree(sbi->s_qf_names[i]);
2015 #endif
2016         ext3_blkdev_remove(sbi);
2017         brelse(bh);
2018 out_fail:
2019         sb->s_fs_info = NULL;
2020         kfree(sbi);
2021         lock_kernel();
2022         return ret;
2023 }
2024
2025 /*
2026  * Setup any per-fs journal parameters now.  We'll do this both on
2027  * initial mount, once the journal has been initialised but before we've
2028  * done any recovery; and again on any subsequent remount.
2029  */
2030 static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
2031 {
2032         struct ext3_sb_info *sbi = EXT3_SB(sb);
2033
2034         if (sbi->s_commit_interval)
2035                 journal->j_commit_interval = sbi->s_commit_interval;
2036         /* We could also set up an ext3-specific default for the commit
2037          * interval here, but for now we'll just fall back to the jbd
2038          * default. */
2039
2040         spin_lock(&journal->j_state_lock);
2041         if (test_opt(sb, BARRIER))
2042                 journal->j_flags |= JFS_BARRIER;
2043         else
2044                 journal->j_flags &= ~JFS_BARRIER;
2045         if (test_opt(sb, DATA_ERR_ABORT))
2046                 journal->j_flags |= JFS_ABORT_ON_SYNCDATA_ERR;
2047         else
2048                 journal->j_flags &= ~JFS_ABORT_ON_SYNCDATA_ERR;
2049         spin_unlock(&journal->j_state_lock);
2050 }
2051
2052 static journal_t *ext3_get_journal(struct super_block *sb,
2053                                    unsigned int journal_inum)
2054 {
2055         struct inode *journal_inode;
2056         journal_t *journal;
2057
2058         /* First, test for the existence of a valid inode on disk.  Bad
2059          * things happen if we iget() an unused inode, as the subsequent
2060          * iput() will try to delete it. */
2061
2062         journal_inode = ext3_iget(sb, journal_inum);
2063         if (IS_ERR(journal_inode)) {
2064                 printk(KERN_ERR "EXT3-fs: no journal found.\n");
2065                 return NULL;
2066         }
2067         if (!journal_inode->i_nlink) {
2068                 make_bad_inode(journal_inode);
2069                 iput(journal_inode);
2070                 printk(KERN_ERR "EXT3-fs: journal inode is deleted.\n");
2071                 return NULL;
2072         }
2073
2074         jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2075                   journal_inode, journal_inode->i_size);
2076         if (!S_ISREG(journal_inode->i_mode)) {
2077                 printk(KERN_ERR "EXT3-fs: invalid journal inode.\n");
2078                 iput(journal_inode);
2079                 return NULL;
2080         }
2081
2082         journal = journal_init_inode(journal_inode);
2083         if (!journal) {
2084                 printk(KERN_ERR "EXT3-fs: Could not load journal inode\n");
2085                 iput(journal_inode);
2086                 return NULL;
2087         }
2088         journal->j_private = sb;
2089         ext3_init_journal_params(sb, journal);
2090         return journal;
2091 }
2092
2093 static journal_t *ext3_get_dev_journal(struct super_block *sb,
2094                                        dev_t j_dev)
2095 {
2096         struct buffer_head * bh;
2097         journal_t *journal;
2098         ext3_fsblk_t start;
2099         ext3_fsblk_t len;
2100         int hblock, blocksize;
2101         ext3_fsblk_t sb_block;
2102         unsigned long offset;
2103         struct ext3_super_block * es;
2104         struct block_device *bdev;
2105
2106         bdev = ext3_blkdev_get(j_dev);
2107         if (bdev == NULL)
2108                 return NULL;
2109
2110         if (bd_claim(bdev, sb)) {
2111                 printk(KERN_ERR
2112                         "EXT3: failed to claim external journal device.\n");
2113                 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
2114                 return NULL;
2115         }
2116
2117         blocksize = sb->s_blocksize;
2118         hblock = bdev_hardsect_size(bdev);
2119         if (blocksize < hblock) {
2120                 printk(KERN_ERR
2121                         "EXT3-fs: blocksize too small for journal device.\n");
2122                 goto out_bdev;
2123         }
2124
2125         sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
2126         offset = EXT3_MIN_BLOCK_SIZE % blocksize;
2127         set_blocksize(bdev, blocksize);
2128         if (!(bh = __bread(bdev, sb_block, blocksize))) {
2129                 printk(KERN_ERR "EXT3-fs: couldn't read superblock of "
2130                        "external journal\n");
2131                 goto out_bdev;
2132         }
2133
2134         es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
2135         if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
2136             !(le32_to_cpu(es->s_feature_incompat) &
2137               EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2138                 printk(KERN_ERR "EXT3-fs: external journal has "
2139                                         "bad superblock\n");
2140                 brelse(bh);
2141                 goto out_bdev;
2142         }
2143
2144         if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2145                 printk(KERN_ERR "EXT3-fs: journal UUID does not match\n");
2146                 brelse(bh);
2147                 goto out_bdev;
2148         }
2149
2150         len = le32_to_cpu(es->s_blocks_count);
2151         start = sb_block + 1;
2152         brelse(bh);     /* we're done with the superblock */
2153
2154         journal = journal_init_dev(bdev, sb->s_bdev,
2155                                         start, len, blocksize);
2156         if (!journal) {
2157                 printk(KERN_ERR "EXT3-fs: failed to create device journal\n");
2158                 goto out_bdev;
2159         }
2160         journal->j_private = sb;
2161         ll_rw_block(READ, 1, &journal->j_sb_buffer);
2162         wait_on_buffer(journal->j_sb_buffer);
2163         if (!buffer_uptodate(journal->j_sb_buffer)) {
2164                 printk(KERN_ERR "EXT3-fs: I/O error on journal device\n");
2165                 goto out_journal;
2166         }
2167         if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
2168                 printk(KERN_ERR "EXT3-fs: External journal has more than one "
2169                                         "user (unsupported) - %d\n",
2170                         be32_to_cpu(journal->j_superblock->s_nr_users));
2171                 goto out_journal;
2172         }
2173         EXT3_SB(sb)->journal_bdev = bdev;
2174         ext3_init_journal_params(sb, journal);
2175         return journal;
2176 out_journal:
2177         journal_destroy(journal);
2178 out_bdev:
2179         ext3_blkdev_put(bdev);
2180         return NULL;
2181 }
2182
2183 static int ext3_load_journal(struct super_block *sb,
2184                              struct ext3_super_block *es,
2185                              unsigned long journal_devnum)
2186 {
2187         journal_t *journal;
2188         unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2189         dev_t journal_dev;
2190         int err = 0;
2191         int really_read_only;
2192
2193         if (journal_devnum &&
2194             journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2195                 printk(KERN_INFO "EXT3-fs: external journal device major/minor "
2196                         "numbers have changed\n");
2197                 journal_dev = new_decode_dev(journal_devnum);
2198         } else
2199                 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2200
2201         really_read_only = bdev_read_only(sb->s_bdev);
2202
2203         /*
2204          * Are we loading a blank journal or performing recovery after a
2205          * crash?  For recovery, we need to check in advance whether we
2206          * can get read-write access to the device.
2207          */
2208
2209         if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
2210                 if (sb->s_flags & MS_RDONLY) {
2211                         printk(KERN_INFO "EXT3-fs: INFO: recovery "
2212                                         "required on readonly filesystem.\n");
2213                         if (really_read_only) {
2214                                 printk(KERN_ERR "EXT3-fs: write access "
2215                                         "unavailable, cannot proceed.\n");
2216                                 return -EROFS;
2217                         }
2218                         printk (KERN_INFO "EXT3-fs: write access will "
2219                                         "be enabled during recovery.\n");
2220                 }
2221         }
2222
2223         if (journal_inum && journal_dev) {
2224                 printk(KERN_ERR "EXT3-fs: filesystem has both journal "
2225                        "and inode journals!\n");
2226                 return -EINVAL;
2227         }
2228
2229         if (journal_inum) {
2230                 if (!(journal = ext3_get_journal(sb, journal_inum)))
2231                         return -EINVAL;
2232         } else {
2233                 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
2234                         return -EINVAL;
2235         }
2236
2237         if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2238                 err = journal_update_format(journal);
2239                 if (err)  {
2240                         printk(KERN_ERR "EXT3-fs: error updating journal.\n");
2241                         journal_destroy(journal);
2242                         return err;
2243                 }
2244         }
2245
2246         if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
2247                 err = journal_wipe(journal, !really_read_only);
2248         if (!err)
2249                 err = journal_load(journal);
2250
2251         if (err) {
2252                 printk(KERN_ERR "EXT3-fs: error loading journal.\n");
2253                 journal_destroy(journal);
2254                 return err;
2255         }
2256
2257         EXT3_SB(sb)->s_journal = journal;
2258         ext3_clear_journal_err(sb, es);
2259
2260         if (journal_devnum &&
2261             journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2262                 es->s_journal_dev = cpu_to_le32(journal_devnum);
2263                 sb->s_dirt = 1;
2264
2265                 /* Make sure we flush the recovery flag to disk. */
2266                 ext3_commit_super(sb, es, 1);
2267         }
2268
2269         return 0;
2270 }
2271
2272 static int ext3_create_journal(struct super_block * sb,
2273                                struct ext3_super_block * es,
2274                                unsigned int journal_inum)
2275 {
2276         journal_t *journal;
2277         int err;
2278
2279         if (sb->s_flags & MS_RDONLY) {
2280                 printk(KERN_ERR "EXT3-fs: readonly filesystem when trying to "
2281                                 "create journal.\n");
2282                 return -EROFS;
2283         }
2284
2285         journal = ext3_get_journal(sb, journal_inum);
2286         if (!journal)
2287                 return -EINVAL;
2288
2289         printk(KERN_INFO "EXT3-fs: creating new journal on inode %u\n",
2290                journal_inum);
2291
2292         err = journal_create(journal);
2293         if (err) {
2294                 printk(KERN_ERR "EXT3-fs: error creating journal.\n");
2295                 journal_destroy(journal);
2296                 return -EIO;
2297         }
2298
2299         EXT3_SB(sb)->s_journal = journal;
2300
2301         ext3_update_dynamic_rev(sb);
2302         EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2303         EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2304
2305         es->s_journal_inum = cpu_to_le32(journal_inum);
2306         sb->s_dirt = 1;
2307
2308         /* Make sure we flush the recovery flag to disk. */
2309         ext3_commit_super(sb, es, 1);
2310
2311         return 0;
2312 }
2313
2314 static void ext3_commit_super (struct super_block * sb,
2315                                struct ext3_super_block * es,
2316                                int sync)
2317 {
2318         struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
2319
2320         if (!sbh)
2321                 return;
2322         es->s_wtime = cpu_to_le32(get_seconds());
2323         es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2324         es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2325         BUFFER_TRACE(sbh, "marking dirty");
2326         mark_buffer_dirty(sbh);
2327         if (sync)
2328                 sync_dirty_buffer(sbh);
2329 }
2330
2331
2332 /*
2333  * Have we just finished recovery?  If so, and if we are mounting (or
2334  * remounting) the filesystem readonly, then we will end up with a
2335  * consistent fs on disk.  Record that fact.
2336  */
2337 static void ext3_mark_recovery_complete(struct super_block * sb,
2338                                         struct ext3_super_block * es)
2339 {
2340         journal_t *journal = EXT3_SB(sb)->s_journal;
2341
2342         journal_lock_updates(journal);
2343         if (journal_flush(journal) < 0)
2344                 goto out;
2345
2346         lock_super(sb);
2347         if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2348             sb->s_flags & MS_RDONLY) {
2349                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2350                 sb->s_dirt = 0;
2351                 ext3_commit_super(sb, es, 1);
2352         }
2353         unlock_super(sb);
2354
2355 out:
2356         journal_unlock_updates(journal);
2357 }
2358
2359 /*
2360  * If we are mounting (or read-write remounting) a filesystem whose journal
2361  * has recorded an error from a previous lifetime, move that error to the
2362  * main filesystem now.
2363  */
2364 static void ext3_clear_journal_err(struct super_block * sb,
2365                                    struct ext3_super_block * es)
2366 {
2367         journal_t *journal;
2368         int j_errno;
2369         const char *errstr;
2370
2371         journal = EXT3_SB(sb)->s_journal;
2372
2373         /*
2374          * Now check for any error status which may have been recorded in the
2375          * journal by a prior ext3_error() or ext3_abort()
2376          */
2377
2378         j_errno = journal_errno(journal);
2379         if (j_errno) {
2380                 char nbuf[16];
2381
2382                 errstr = ext3_decode_error(sb, j_errno, nbuf);
2383                 ext3_warning(sb, __func__, "Filesystem error recorded "
2384                              "from previous mount: %s", errstr);
2385                 ext3_warning(sb, __func__, "Marking fs in need of "
2386                              "filesystem check.");
2387
2388                 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2389                 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2390                 ext3_commit_super (sb, es, 1);
2391
2392                 journal_clear_err(journal);
2393         }
2394 }
2395
2396 /*
2397  * Force the running and committing transactions to commit,
2398  * and wait on the commit.
2399  */
2400 int ext3_force_commit(struct super_block *sb)
2401 {
2402         journal_t *journal;
2403         int ret;
2404
2405         if (sb->s_flags & MS_RDONLY)
2406                 return 0;
2407
2408         journal = EXT3_SB(sb)->s_journal;
2409         sb->s_dirt = 0;
2410         ret = ext3_journal_force_commit(journal);
2411         return ret;
2412 }
2413
2414 /*
2415  * Ext3 always journals updates to the superblock itself, so we don't
2416  * have to propagate any other updates to the superblock on disk at this
2417  * point.  (We can probably nuke this function altogether, and remove
2418  * any mention to sb->s_dirt in all of fs/ext3; eventual cleanup...)
2419  */
2420 static void ext3_write_super (struct super_block * sb)
2421 {
2422         if (mutex_trylock(&sb->s_lock) != 0)
2423                 BUG();
2424         sb->s_dirt = 0;
2425 }
2426
2427 static int ext3_sync_fs(struct super_block *sb, int wait)
2428 {
2429         sb->s_dirt = 0;
2430         if (wait)
2431                 ext3_force_commit(sb);
2432         else
2433                 journal_start_commit(EXT3_SB(sb)->s_journal, NULL);
2434
2435         return 0;
2436 }
2437
2438 /*
2439  * LVM calls this function before a (read-only) snapshot is created.  This
2440  * gives us a chance to flush the journal completely and mark the fs clean.
2441  */
2442 static void ext3_write_super_lockfs(struct super_block *sb)
2443 {
2444         sb->s_dirt = 0;
2445
2446         if (!(sb->s_flags & MS_RDONLY)) {
2447                 journal_t *journal = EXT3_SB(sb)->s_journal;
2448
2449                 /* Now we set up the journal barrier. */
2450                 journal_lock_updates(journal);
2451
2452                 /*
2453                  * We don't want to clear needs_recovery flag when we failed
2454                  * to flush the journal.
2455                  */
2456                 if (journal_flush(journal) < 0)
2457                         return;
2458
2459                 /* Journal blocked and flushed, clear needs_recovery flag. */
2460                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2461                 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2462         }
2463 }
2464
2465 /*
2466  * Called by LVM after the snapshot is done.  We need to reset the RECOVER
2467  * flag here, even though the filesystem is not technically dirty yet.
2468  */
2469 static void ext3_unlockfs(struct super_block *sb)
2470 {
2471         if (!(sb->s_flags & MS_RDONLY)) {
2472                 lock_super(sb);
2473                 /* Reser the needs_recovery flag before the fs is unlocked. */
2474                 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2475                 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2476                 unlock_super(sb);
2477                 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2478         }
2479 }
2480
2481 static int ext3_remount (struct super_block * sb, int * flags, char * data)
2482 {
2483         struct ext3_super_block * es;
2484         struct ext3_sb_info *sbi = EXT3_SB(sb);
2485         ext3_fsblk_t n_blocks_count = 0;
2486         unsigned long old_sb_flags;
2487         struct ext3_mount_options old_opts;
2488         int err;
2489 #ifdef CONFIG_QUOTA
2490         int i;
2491 #endif
2492
2493         /* Store the original options */
2494         old_sb_flags = sb->s_flags;
2495         old_opts.s_mount_opt = sbi->s_mount_opt;
2496         old_opts.s_resuid = sbi->s_resuid;
2497         old_opts.s_resgid = sbi->s_resgid;
2498         old_opts.s_commit_interval = sbi->s_commit_interval;
2499 #ifdef CONFIG_QUOTA
2500         old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2501         for (i = 0; i < MAXQUOTAS; i++)
2502                 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2503 #endif
2504
2505         /*
2506          * Allow the "check" option to be passed as a remount option.
2507          */
2508         if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2509                 err = -EINVAL;
2510                 goto restore_opts;
2511         }
2512
2513         if (sbi->s_mount_opt & EXT3_MOUNT_ABORT)
2514                 ext3_abort(sb, __func__, "Abort forced by user");
2515
2516         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2517                 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2518
2519         es = sbi->s_es;
2520
2521         ext3_init_journal_params(sb, sbi->s_journal);
2522
2523         if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2524                 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
2525                 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT) {
2526                         err = -EROFS;
2527                         goto restore_opts;
2528                 }
2529
2530                 if (*flags & MS_RDONLY) {
2531                         /*
2532                          * First of all, the unconditional stuff we have to do
2533                          * to disable replay of the journal when we next remount
2534                          */
2535                         sb->s_flags |= MS_RDONLY;
2536
2537                         /*
2538                          * OK, test if we are remounting a valid rw partition
2539                          * readonly, and if so set the rdonly flag and then
2540                          * mark the partition as valid again.
2541                          */
2542                         if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2543                             (sbi->s_mount_state & EXT3_VALID_FS))
2544                                 es->s_state = cpu_to_le16(sbi->s_mount_state);
2545
2546                         /*
2547                          * We have to unlock super so that we can wait for
2548                          * transactions.
2549                          */
2550                         unlock_super(sb);
2551                         ext3_mark_recovery_complete(sb, es);
2552                         lock_super(sb);
2553                 } else {
2554                         __le32 ret;
2555                         if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2556                                         ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2557                                 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2558                                        "remount RDWR because of unsupported "
2559                                        "optional features (%x).\n",
2560                                        sb->s_id, le32_to_cpu(ret));
2561                                 err = -EROFS;
2562                                 goto restore_opts;
2563                         }
2564
2565                         /*
2566                          * If we have an unprocessed orphan list hanging
2567                          * around from a previously readonly bdev mount,
2568                          * require a full umount/remount for now.
2569                          */
2570                         if (es->s_last_orphan) {
2571                                 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2572                                        "remount RDWR because of unprocessed "
2573                                        "orphan inode list.  Please "
2574                                        "umount/remount instead.\n",
2575                                        sb->s_id);
2576                                 err = -EINVAL;
2577                                 goto restore_opts;
2578                         }
2579
2580                         /*
2581                          * Mounting a RDONLY partition read-write, so reread
2582                          * and store the current valid flag.  (It may have
2583                          * been changed by e2fsck since we originally mounted
2584                          * the partition.)
2585                          */
2586                         ext3_clear_journal_err(sb, es);
2587                         sbi->s_mount_state = le16_to_cpu(es->s_state);
2588                         if ((err = ext3_group_extend(sb, es, n_blocks_count)))
2589                                 goto restore_opts;
2590                         if (!ext3_setup_super (sb, es, 0))
2591                                 sb->s_flags &= ~MS_RDONLY;
2592                 }
2593         }
2594 #ifdef CONFIG_QUOTA
2595         /* Release old quota file names */
2596         for (i = 0; i < MAXQUOTAS; i++)
2597                 if (old_opts.s_qf_names[i] &&
2598                     old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2599                         kfree(old_opts.s_qf_names[i]);
2600 #endif
2601         return 0;
2602 restore_opts:
2603         sb->s_flags = old_sb_flags;
2604         sbi->s_mount_opt = old_opts.s_mount_opt;
2605         sbi->s_resuid = old_opts.s_resuid;
2606         sbi->s_resgid = old_opts.s_resgid;
2607         sbi->s_commit_interval = old_opts.s_commit_interval;
2608 #ifdef CONFIG_QUOTA
2609         sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2610         for (i = 0; i < MAXQUOTAS; i++) {
2611                 if (sbi->s_qf_names[i] &&
2612                     old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2613                         kfree(sbi->s_qf_names[i]);
2614                 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2615         }
2616 #endif
2617         return err;
2618 }
2619
2620 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
2621 {
2622         struct super_block *sb = dentry->d_sb;
2623         struct ext3_sb_info *sbi = EXT3_SB(sb);
2624         struct ext3_super_block *es = sbi->s_es;
2625         u64 fsid;
2626
2627         if (test_opt(sb, MINIX_DF)) {
2628                 sbi->s_overhead_last = 0;
2629         } else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
2630                 unsigned long ngroups = sbi->s_groups_count, i;
2631                 ext3_fsblk_t overhead = 0;
2632                 smp_rmb();
2633
2634                 /*
2635                  * Compute the overhead (FS structures).  This is constant
2636                  * for a given filesystem unless the number of block groups
2637                  * changes so we cache the previous value until it does.
2638                  */
2639
2640                 /*
2641                  * All of the blocks before first_data_block are
2642                  * overhead
2643                  */
2644                 overhead = le32_to_cpu(es->s_first_data_block);
2645
2646                 /*
2647                  * Add the overhead attributed to the superblock and
2648                  * block group descriptors.  If the sparse superblocks
2649                  * feature is turned on, then not all groups have this.
2650                  */
2651                 for (i = 0; i < ngroups; i++) {
2652                         overhead += ext3_bg_has_super(sb, i) +
2653                                 ext3_bg_num_gdb(sb, i);
2654                         cond_resched();
2655                 }
2656
2657                 /*
2658                  * Every block group has an inode bitmap, a block
2659                  * bitmap, and an inode table.
2660                  */
2661                 overhead += ngroups * (2 + sbi->s_itb_per_group);
2662                 sbi->s_overhead_last = overhead;
2663                 smp_wmb();
2664                 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
2665         }
2666
2667         buf->f_type = EXT3_SUPER_MAGIC;
2668         buf->f_bsize = sb->s_blocksize;
2669         buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
2670         buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
2671         es->s_free_blocks_count = cpu_to_le32(buf->f_bfree);
2672         buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2673         if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2674                 buf->f_bavail = 0;
2675         buf->f_files = le32_to_cpu(es->s_inodes_count);
2676         buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
2677         es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
2678         buf->f_namelen = EXT3_NAME_LEN;
2679         fsid = le64_to_cpup((void *)es->s_uuid) ^
2680                le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2681         buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2682         buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
2683         return 0;
2684 }
2685
2686 /* Helper function for writing quotas on sync - we need to start transaction before quota file
2687  * is locked for write. Otherwise the are possible deadlocks:
2688  * Process 1                         Process 2
2689  * ext3_create()                     quota_sync()
2690  *   journal_start()                   write_dquot()
2691  *   DQUOT_INIT()                        down(dqio_mutex)
2692  *     down(dqio_mutex)                    journal_start()
2693  *
2694  */
2695
2696 #ifdef CONFIG_QUOTA
2697
2698 static inline struct inode *dquot_to_inode(struct dquot *dquot)
2699 {
2700         return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2701 }
2702
2703 static int ext3_dquot_initialize(struct inode *inode, int type)
2704 {
2705         handle_t *handle;
2706         int ret, err;
2707
2708         /* We may create quota structure so we need to reserve enough blocks */
2709         handle = ext3_journal_start(inode, 2*EXT3_QUOTA_INIT_BLOCKS(inode->i_sb));
2710         if (IS_ERR(handle))
2711                 return PTR_ERR(handle);
2712         ret = dquot_initialize(inode, type);
2713         err = ext3_journal_stop(handle);
2714         if (!ret)
2715                 ret = err;
2716         return ret;
2717 }
2718
2719 static int ext3_dquot_drop(struct inode *inode)
2720 {
2721         handle_t *handle;
2722         int ret, err;
2723
2724         /* We may delete quota structure so we need to reserve enough blocks */
2725         handle = ext3_journal_start(inode, 2*EXT3_QUOTA_DEL_BLOCKS(inode->i_sb));
2726         if (IS_ERR(handle)) {
2727                 /*
2728                  * We call dquot_drop() anyway to at least release references
2729                  * to quota structures so that umount does not hang.
2730                  */
2731                 dquot_drop(inode);
2732                 return PTR_ERR(handle);
2733         }
2734         ret = dquot_drop(inode);
2735         err = ext3_journal_stop(handle);
2736         if (!ret)
2737                 ret = err;
2738         return ret;
2739 }
2740
2741 static int ext3_write_dquot(struct dquot *dquot)
2742 {
2743         int ret, err;
2744         handle_t *handle;
2745         struct inode *inode;
2746
2747         inode = dquot_to_inode(dquot);
2748         handle = ext3_journal_start(inode,
2749                                         EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2750         if (IS_ERR(handle))
2751                 return PTR_ERR(handle);
2752         ret = dquot_commit(dquot);
2753         err = ext3_journal_stop(handle);
2754         if (!ret)
2755                 ret = err;
2756         return ret;
2757 }
2758
2759 static int ext3_acquire_dquot(struct dquot *dquot)
2760 {
2761         int ret, err;
2762         handle_t *handle;
2763
2764         handle = ext3_journal_start(dquot_to_inode(dquot),
2765                                         EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2766         if (IS_ERR(handle))
2767                 return PTR_ERR(handle);
2768         ret = dquot_acquire(dquot);
2769         err = ext3_journal_stop(handle);
2770         if (!ret)
2771                 ret = err;
2772         return ret;
2773 }
2774
2775 static int ext3_release_dquot(struct dquot *dquot)
2776 {
2777         int ret, err;
2778         handle_t *handle;
2779
2780         handle = ext3_journal_start(dquot_to_inode(dquot),
2781                                         EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2782         if (IS_ERR(handle)) {
2783                 /* Release dquot anyway to avoid endless cycle in dqput() */
2784                 dquot_release(dquot);
2785                 return PTR_ERR(handle);
2786         }
2787         ret = dquot_release(dquot);
2788         err = ext3_journal_stop(handle);
2789         if (!ret)
2790                 ret = err;
2791         return ret;
2792 }
2793
2794 static int ext3_mark_dquot_dirty(struct dquot *dquot)
2795 {
2796         /* Are we journaling quotas? */
2797         if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2798             EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2799                 dquot_mark_dquot_dirty(dquot);
2800                 return ext3_write_dquot(dquot);
2801         } else {
2802                 return dquot_mark_dquot_dirty(dquot);
2803         }
2804 }
2805
2806 static int ext3_write_info(struct super_block *sb, int type)
2807 {
2808         int ret, err;
2809         handle_t *handle;
2810
2811         /* Data block + inode block */
2812         handle = ext3_journal_start(sb->s_root->d_inode, 2);
2813         if (IS_ERR(handle))
2814                 return PTR_ERR(handle);
2815         ret = dquot_commit_info(sb, type);
2816         err = ext3_journal_stop(handle);
2817         if (!ret)
2818                 ret = err;
2819         return ret;
2820 }
2821
2822 /*
2823  * Turn on quotas during mount time - we need to find
2824  * the quota file and such...
2825  */
2826 static int ext3_quota_on_mount(struct super_block *sb, int type)
2827 {
2828         return vfs_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2829                         EXT3_SB(sb)->s_jquota_fmt, type);
2830 }
2831
2832 /*
2833  * Standard function to be called on quota_on
2834  */
2835 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
2836                          char *name, int remount)
2837 {
2838         int err;
2839         struct path path;
2840
2841         if (!test_opt(sb, QUOTA))
2842                 return -EINVAL;
2843         /* When remounting, no checks are needed and in fact, name is NULL */
2844         if (remount)
2845                 return vfs_quota_on(sb, type, format_id, name, remount);
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                         printk(KERN_WARNING
2861                                 "EXT3-fs: Quota file not on filesystem root. "
2862                                 "Journaled quota will not work.\n");
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 = vfs_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 tocopy;
2938         int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
2939         size_t towrite = len;
2940         struct buffer_head *bh;
2941         handle_t *handle = journal_current_handle();
2942
2943         if (!handle) {
2944                 printk(KERN_WARNING "EXT3-fs: Quota write (off=%Lu, len=%Lu)"
2945                         " cancelled because transaction is not started.\n",
2946                         (unsigned long long)off, (unsigned long long)len);
2947                 return -EIO;
2948         }
2949         mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2950         while (towrite > 0) {
2951                 tocopy = sb->s_blocksize - offset < towrite ?
2952                                 sb->s_blocksize - offset : towrite;
2953                 bh = ext3_bread(handle, inode, blk, 1, &err);
2954                 if (!bh)
2955                         goto out;
2956                 if (journal_quota) {
2957                         err = ext3_journal_get_write_access(handle, bh);
2958                         if (err) {
2959                                 brelse(bh);
2960                                 goto out;
2961                         }
2962                 }
2963                 lock_buffer(bh);
2964                 memcpy(bh->b_data+offset, data, tocopy);
2965                 flush_dcache_page(bh->b_page);
2966                 unlock_buffer(bh);
2967                 if (journal_quota)
2968                         err = ext3_journal_dirty_metadata(handle, bh);
2969                 else {
2970                         /* Always do at least ordered writes for quotas */
2971                         err = ext3_journal_dirty_data(handle, bh);
2972                         mark_buffer_dirty(bh);
2973                 }
2974                 brelse(bh);
2975                 if (err)
2976                         goto out;
2977                 offset = 0;
2978                 towrite -= tocopy;
2979                 data += tocopy;
2980                 blk++;
2981         }
2982 out:
2983         if (len == towrite) {
2984                 mutex_unlock(&inode->i_mutex);
2985                 return err;
2986         }
2987         if (inode->i_size < off+len-towrite) {
2988                 i_size_write(inode, off+len-towrite);
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 - towrite;
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)