err.no Git - linux-2.6/blob - 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/config.h>
  20 #include <linux/module.h>
  21 #include <linux/string.h>
  22 #include <linux/fs.h>
  23 #include <linux/time.h>
  24 #include <linux/jbd.h>
  25 #include <linux/ext3_fs.h>
  26 #include <linux/ext3_jbd.h>
  27 #include <linux/slab.h>
  28 #include <linux/init.h>
  29 #include <linux/blkdev.h>
  30 #include <linux/parser.h>
  31 #include <linux/smp_lock.h>
  32 #include <linux/buffer_head.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
  40 #include <asm/uaccess.h>
  41
  42 #include "xattr.h"
  43 #include "acl.h"
  44 #include "namei.h"
  45
  46 static int ext3_load_journal(struct super_block *, struct ext3_super_block *,
  47                              unsigned long journal_devnum);
  48 static int ext3_create_journal(struct super_block *, struct ext3_super_block *,
  49                                int);
  50 static void ext3_commit_super (struct super_block * sb,
  51                                struct ext3_super_block * es,
  52                                int sync);
  53 static void ext3_mark_recovery_complete(struct super_block * sb,
  54                                         struct ext3_super_block * es);
  55 static void ext3_clear_journal_err(struct super_block * sb,
  56                                    struct ext3_super_block * es);
  57 static int ext3_sync_fs(struct super_block *sb, int wait);
  58 static const char *ext3_decode_error(struct super_block * sb, int errno,
  59                                      char nbuf[16]);
  60 static int ext3_remount (struct super_block * sb, int * flags, char * data);
  61 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf);
  62 static void ext3_unlockfs(struct super_block *sb);
  63 static void ext3_write_super (struct super_block * sb);
  64 static void ext3_write_super_lockfs(struct super_block *sb);
  65
  66 /*
  67  * Wrappers for journal_start/end.
  68  *
  69  * The only special thing we need to do here is to make sure that all
  70  * journal_end calls result in the superblock being marked dirty, so
  71  * that sync() will call the filesystem's write_super callback if
  72  * appropriate.
  73  */
  74 handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks)
  75 {
  76         journal_t *journal;
  77
  78         if (sb->s_flags & MS_RDONLY)
  79                 return ERR_PTR(-EROFS);
  80
  81         /* Special case here: if the journal has aborted behind our
  82          * backs (eg. EIO in the commit thread), then we still need to
  83          * take the FS itself readonly cleanly. */
  84         journal = EXT3_SB(sb)->s_journal;
  85         if (is_journal_aborted(journal)) {
  86                 ext3_abort(sb, __FUNCTION__,
  87                            "Detected aborted journal");
  88                 return ERR_PTR(-EROFS);
  89         }
  90
  91         return journal_start(journal, nblocks);
  92 }
  93
  94 /*
  95  * The only special thing we need to do here is to make sure that all
  96  * journal_stop calls result in the superblock being marked dirty, so
  97  * that sync() will call the filesystem's write_super callback if
  98  * appropriate.
  99  */
 100 int __ext3_journal_stop(const char *where, handle_t *handle)
 101 {
 102         struct super_block *sb;
 103         int err;
 104         int rc;
 105
 106         sb = handle->h_transaction->t_journal->j_private;
 107         err = handle->h_err;
 108         rc = journal_stop(handle);
 109
 110         if (!err)
 111                 err = rc;
 112         if (err)
 113                 __ext3_std_error(sb, where, err);
 114         return err;
 115 }
 116
 117 void ext3_journal_abort_handle(const char *caller, const char *err_fn,
 118                 struct buffer_head *bh, handle_t *handle, int err)
 119 {
 120         char nbuf[16];
 121         const char *errstr = ext3_decode_error(NULL, err, nbuf);
 122
 123         if (bh)
 124                 BUFFER_TRACE(bh, "abort");
 125
 126         if (!handle->h_err)
 127                 handle->h_err = err;
 128
 129         if (is_handle_aborted(handle))
 130                 return;
 131
 132         printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
 133                caller, errstr, err_fn);
 134
 135         journal_abort_handle(handle);
 136 }
 137
 138 /* Deal with the reporting of failure conditions on a filesystem such as
 139  * inconsistencies detected or read IO failures.
 140  *
 141  * On ext2, we can store the error state of the filesystem in the
 142  * superblock.  That is not possible on ext3, because we may have other
 143  * write ordering constraints on the superblock which prevent us from
 144  * writing it out straight away; and given that the journal is about to
 145  * be aborted, we can't rely on the current, or future, transactions to
 146  * write out the superblock safely.
 147  *
 148  * We'll just use the journal_abort() error code to record an error in
 149  * the journal instead.  On recovery, the journal will compain about
 150  * that error until we've noted it down and cleared it.
 151  */
 152
 153 static void ext3_handle_error(struct super_block *sb)
 154 {
 155         struct ext3_super_block *es = EXT3_SB(sb)->s_es;
 156
 157         EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
 158         es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
 159
 160         if (sb->s_flags & MS_RDONLY)
 161                 return;
 162
 163         if (test_opt (sb, ERRORS_RO)) {
 164                 printk (KERN_CRIT "Remounting filesystem read-only\n");
 165                 sb->s_flags |= MS_RDONLY;
 166         } else {
 167                 journal_t *journal = EXT3_SB(sb)->s_journal;
 168
 169                 EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
 170                 if (journal)
 171                         journal_abort(journal, -EIO);
 172         }
 173         if (test_opt(sb, ERRORS_PANIC))
 174                 panic("EXT3-fs (device %s): panic forced after error\n",
 175                         sb->s_id);
 176         ext3_commit_super(sb, es, 1);
 177 }
 178
 179 void ext3_error (struct super_block * sb, const char * function,
 180                  const char * fmt, ...)
 181 {
 182         va_list args;
 183
 184         va_start(args, fmt);
 185         printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
 186         vprintk(fmt, args);
 187         printk("\n");
 188         va_end(args);
 189
 190         ext3_handle_error(sb);
 191 }
 192
 193 static const char *ext3_decode_error(struct super_block * sb, int errno,
 194                                      char nbuf[16])
 195 {
 196         char *errstr = NULL;
 197
 198         switch (errno) {
 199         case -EIO:
 200                 errstr = "IO failure";
 201                 break;
 202         case -ENOMEM:
 203                 errstr = "Out of memory";
 204                 break;
 205         case -EROFS:
 206                 if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT)
 207                         errstr = "Journal has aborted";
 208                 else
 209                         errstr = "Readonly filesystem";
 210                 break;
 211         default:
 212                 /* If the caller passed in an extra buffer for unknown
 213                  * errors, textualise them now.  Else we just return
 214                  * NULL. */
 215                 if (nbuf) {
 216                         /* Check for truncated error codes... */
 217                         if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
 218                                 errstr = nbuf;
 219                 }
 220                 break;
 221         }
 222
 223         return errstr;
 224 }
 225
 226 /* __ext3_std_error decodes expected errors from journaling functions
 227  * automatically and invokes the appropriate error response.  */
 228
 229 void __ext3_std_error (struct super_block * sb, const char * function,
 230                        int errno)
 231 {
 232         char nbuf[16];
 233         const char *errstr;
 234
 235         /* Special case: if the error is EROFS, and we're not already
 236          * inside a transaction, then there's really no point in logging
 237          * an error. */
 238         if (errno == -EROFS && journal_current_handle() == NULL &&
 239             (sb->s_flags & MS_RDONLY))
 240                 return;
 241
 242         errstr = ext3_decode_error(sb, errno, nbuf);
 243         printk (KERN_CRIT "EXT3-fs error (device %s) in %s: %s\n",
 244                 sb->s_id, function, errstr);
 245
 246         ext3_handle_error(sb);
 247 }
 248
 249 /*
 250  * ext3_abort is a much stronger failure handler than ext3_error.  The
 251  * abort function may be used to deal with unrecoverable failures such
 252  * as journal IO errors or ENOMEM at a critical moment in log management.
 253  *
 254  * We unconditionally force the filesystem into an ABORT|READONLY state,
 255  * unless the error response on the fs has been set to panic in which
 256  * case we take the easy way out and panic immediately.
 257  */
 258
 259 void ext3_abort (struct super_block * sb, const char * function,
 260                  const char * fmt, ...)
 261 {
 262         va_list args;
 263
 264         printk (KERN_CRIT "ext3_abort called.\n");
 265
 266         va_start(args, fmt);
 267         printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
 268         vprintk(fmt, args);
 269         printk("\n");
 270         va_end(args);
 271
 272         if (test_opt(sb, ERRORS_PANIC))
 273                 panic("EXT3-fs panic from previous error\n");
 274
 275         if (sb->s_flags & MS_RDONLY)
 276                 return;
 277
 278         printk(KERN_CRIT "Remounting filesystem read-only\n");
 279         EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
 280         sb->s_flags |= MS_RDONLY;
 281         EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
 282         journal_abort(EXT3_SB(sb)->s_journal, -EIO);
 283 }
 284
 285 void ext3_warning (struct super_block * sb, const char * function,
 286                    const char * fmt, ...)
 287 {
 288         va_list args;
 289
 290         va_start(args, fmt);
 291         printk(KERN_WARNING "EXT3-fs warning (device %s): %s: ",
 292                sb->s_id, function);
 293         vprintk(fmt, args);
 294         printk("\n");
 295         va_end(args);
 296 }
 297
 298 void ext3_update_dynamic_rev(struct super_block *sb)
 299 {
 300         struct ext3_super_block *es = EXT3_SB(sb)->s_es;
 301
 302         if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
 303                 return;
 304
 305         ext3_warning(sb, __FUNCTION__,
 306                      "updating to rev %d because of new feature flag, "
 307                      "running e2fsck is recommended",
 308                      EXT3_DYNAMIC_REV);
 309
 310         es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO);
 311         es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE);
 312         es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV);
 313         /* leave es->s_feature_*compat flags alone */
 314         /* es->s_uuid will be set by e2fsck if empty */
 315
 316         /*
 317          * The rest of the superblock fields should be zero, and if not it
 318          * means they are likely already in use, so leave them alone.  We
 319          * can leave it up to e2fsck to clean up any inconsistencies there.
 320          */
 321 }
 322
 323 /*
 324  * Open the external journal device
 325  */
 326 static struct block_device *ext3_blkdev_get(dev_t dev)
 327 {
 328         struct block_device *bdev;
 329         char b[BDEVNAME_SIZE];
 330
 331         bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
 332         if (IS_ERR(bdev))
 333                 goto fail;
 334         return bdev;
 335
 336 fail:
 337         printk(KERN_ERR "EXT3: failed to open journal device %s: %ld\n",
 338                         __bdevname(dev, b), PTR_ERR(bdev));
 339         return NULL;
 340 }
 341
 342 /*
 343  * Release the journal device
 344  */
 345 static int ext3_blkdev_put(struct block_device *bdev)
 346 {
 347         bd_release(bdev);
 348         return blkdev_put(bdev);
 349 }
 350
 351 static int ext3_blkdev_remove(struct ext3_sb_info *sbi)
 352 {
 353         struct block_device *bdev;
 354         int ret = -ENODEV;
 355
 356         bdev = sbi->journal_bdev;
 357         if (bdev) {
 358                 ret = ext3_blkdev_put(bdev);
 359                 sbi->journal_bdev = NULL;
 360         }
 361         return ret;
 362 }
 363
 364 static inline struct inode *orphan_list_entry(struct list_head *l)
 365 {
 366         return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
 367 }
 368
 369 static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
 370 {
 371         struct list_head *l;
 372
 373         printk(KERN_ERR "sb orphan head is %d\n",
 374                le32_to_cpu(sbi->s_es->s_last_orphan));
 375
 376         printk(KERN_ERR "sb_info orphan list:\n");
 377         list_for_each(l, &sbi->s_orphan) {
 378                 struct inode *inode = orphan_list_entry(l);
 379                 printk(KERN_ERR "  "
 380                        "inode %s:%ld at %p: mode %o, nlink %d, next %d\n",
 381                        inode->i_sb->s_id, inode->i_ino, inode,
 382                        inode->i_mode, inode->i_nlink,
 383                        NEXT_ORPHAN(inode));
 384         }
 385 }
 386
 387 static void ext3_put_super (struct super_block * sb)
 388 {
 389         struct ext3_sb_info *sbi = EXT3_SB(sb);
 390         struct ext3_super_block *es = sbi->s_es;
 391         int i;
 392
 393         ext3_xattr_put_super(sb);
 394         journal_destroy(sbi->s_journal);
 395         if (!(sb->s_flags & MS_RDONLY)) {
 396                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
 397                 es->s_state = cpu_to_le16(sbi->s_mount_state);
 398                 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
 399                 mark_buffer_dirty(sbi->s_sbh);
 400                 ext3_commit_super(sb, es, 1);
 401         }
 402
 403         for (i = 0; i < sbi->s_gdb_count; i++)
 404                 brelse(sbi->s_group_desc[i]);
 405         kfree(sbi->s_group_desc);
 406         percpu_counter_destroy(&sbi->s_freeblocks_counter);
 407         percpu_counter_destroy(&sbi->s_freeinodes_counter);
 408         percpu_counter_destroy(&sbi->s_dirs_counter);
 409         brelse(sbi->s_sbh);
 410 #ifdef CONFIG_QUOTA
 411         for (i = 0; i < MAXQUOTAS; i++)
 412                 kfree(sbi->s_qf_names[i]);
 413 #endif
 414
 415         /* Debugging code just in case the in-memory inode orphan list
 416          * isn't empty.  The on-disk one can be non-empty if we've
 417          * detected an error and taken the fs readonly, but the
 418          * in-memory list had better be clean by this point. */
 419         if (!list_empty(&sbi->s_orphan))
 420                 dump_orphan_list(sb, sbi);
 421         J_ASSERT(list_empty(&sbi->s_orphan));
 422
 423         invalidate_bdev(sb->s_bdev, 0);
 424         if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
 425                 /*
 426                  * Invalidate the journal device's buffers.  We don't want them
 427                  * floating about in memory - the physical journal device may
 428                  * hotswapped, and it breaks the `ro-after' testing code.
 429                  */
 430                 sync_blockdev(sbi->journal_bdev);
 431                 invalidate_bdev(sbi->journal_bdev, 0);
 432                 ext3_blkdev_remove(sbi);
 433         }
 434         sb->s_fs_info = NULL;
 435         kfree(sbi);
 436         return;
 437 }
 438
 439 static kmem_cache_t *ext3_inode_cachep;
 440
 441 /*
 442  * Called inside transaction, so use GFP_NOFS
 443  */
 444 static struct inode *ext3_alloc_inode(struct super_block *sb)
 445 {
 446         struct ext3_inode_info *ei;
 447
 448         ei = kmem_cache_alloc(ext3_inode_cachep, SLAB_NOFS);
 449         if (!ei)
 450                 return NULL;
 451 #ifdef CONFIG_EXT3_FS_POSIX_ACL
 452         ei->i_acl = EXT3_ACL_NOT_CACHED;
 453         ei->i_default_acl = EXT3_ACL_NOT_CACHED;
 454 #endif
 455         ei->i_block_alloc_info = NULL;
 456         ei->vfs_inode.i_version = 1;
 457         return &ei->vfs_inode;
 458 }
 459
 460 static void ext3_destroy_inode(struct inode *inode)
 461 {
 462         kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
 463 }
 464
 465 static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
 466 {
 467         struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
 468
 469         if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
 470             SLAB_CTOR_CONSTRUCTOR) {
 471                 INIT_LIST_HEAD(&ei->i_orphan);
 472 #ifdef CONFIG_EXT3_FS_XATTR
 473                 init_rwsem(&ei->xattr_sem);
 474 #endif
 475                 mutex_init(&ei->truncate_mutex);
 476                 inode_init_once(&ei->vfs_inode);
 477         }
 478 }
 479
 480 static int init_inodecache(void)
 481 {
 482         ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
 483                                              sizeof(struct ext3_inode_info),
 484                                              0, (SLAB_RECLAIM_ACCOUNT|
 485                                                 SLAB_MEM_SPREAD),
 486                                              init_once, NULL);
 487         if (ext3_inode_cachep == NULL)
 488                 return -ENOMEM;
 489         return 0;
 490 }
 491
 492 static void destroy_inodecache(void)
 493 {
 494         if (kmem_cache_destroy(ext3_inode_cachep))
 495                 printk(KERN_INFO "ext3_inode_cache: not all structures were freed\n");
 496 }
 497
 498 static void ext3_clear_inode(struct inode *inode)
 499 {
 500         struct ext3_block_alloc_info *rsv = EXT3_I(inode)->i_block_alloc_info;
 501 #ifdef CONFIG_EXT3_FS_POSIX_ACL
 502         if (EXT3_I(inode)->i_acl &&
 503                         EXT3_I(inode)->i_acl != EXT3_ACL_NOT_CACHED) {
 504                 posix_acl_release(EXT3_I(inode)->i_acl);
 505                 EXT3_I(inode)->i_acl = EXT3_ACL_NOT_CACHED;
 506         }
 507         if (EXT3_I(inode)->i_default_acl &&
 508                         EXT3_I(inode)->i_default_acl != EXT3_ACL_NOT_CACHED) {
 509                 posix_acl_release(EXT3_I(inode)->i_default_acl);
 510                 EXT3_I(inode)->i_default_acl = EXT3_ACL_NOT_CACHED;
 511         }
 512 #endif
 513         ext3_discard_reservation(inode);
 514         EXT3_I(inode)->i_block_alloc_info = NULL;
 515         if (unlikely(rsv))
 516                 kfree(rsv);
 517 }
 518
 519 static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
 520 {
 521 #if defined(CONFIG_QUOTA)
 522         struct ext3_sb_info *sbi = EXT3_SB(sb);
 523
 524         if (sbi->s_jquota_fmt)
 525                 seq_printf(seq, ",jqfmt=%s",
 526                 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0");
 527
 528         if (sbi->s_qf_names[USRQUOTA])
 529                 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
 530
 531         if (sbi->s_qf_names[GRPQUOTA])
 532                 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
 533
 534         if (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA)
 535                 seq_puts(seq, ",usrquota");
 536
 537         if (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)
 538                 seq_puts(seq, ",grpquota");
 539 #endif
 540 }
 541
 542 static int ext3_show_options(struct seq_file *seq, struct vfsmount *vfs)
 543 {
 544         struct super_block *sb = vfs->mnt_sb;
 545
 546         if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA)
 547                 seq_puts(seq, ",data=journal");
 548         else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA)
 549                 seq_puts(seq, ",data=ordered");
 550         else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)
 551                 seq_puts(seq, ",data=writeback");
 552
 553         ext3_show_quota_options(seq, sb);
 554
 555         return 0;
 556 }
 557
 558 #ifdef CONFIG_QUOTA
 559 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
 560 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
 561
 562 static int ext3_dquot_initialize(struct inode *inode, int type);
 563 static int ext3_dquot_drop(struct inode *inode);
 564 static int ext3_write_dquot(struct dquot *dquot);
 565 static int ext3_acquire_dquot(struct dquot *dquot);
 566 static int ext3_release_dquot(struct dquot *dquot);
 567 static int ext3_mark_dquot_dirty(struct dquot *dquot);
 568 static int ext3_write_info(struct super_block *sb, int type);
 569 static int ext3_quota_on(struct super_block *sb, int type, int format_id, char *path);
 570 static int ext3_quota_on_mount(struct super_block *sb, int type);
 571 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
 572                                size_t len, loff_t off);
 573 static ssize_t ext3_quota_write(struct super_block *sb, int type,
 574                                 const char *data, size_t len, loff_t off);
 575
 576 static struct dquot_operations ext3_quota_operations = {
 577         .initialize     = ext3_dquot_initialize,
 578         .drop           = ext3_dquot_drop,
 579         .alloc_space    = dquot_alloc_space,
 580         .alloc_inode    = dquot_alloc_inode,
 581         .free_space     = dquot_free_space,
 582         .free_inode     = dquot_free_inode,
 583         .transfer       = dquot_transfer,
 584         .write_dquot    = ext3_write_dquot,
 585         .acquire_dquot  = ext3_acquire_dquot,
 586         .release_dquot  = ext3_release_dquot,
 587         .mark_dirty     = ext3_mark_dquot_dirty,
 588         .write_info     = ext3_write_info
 589 };
 590
 591 static struct quotactl_ops ext3_qctl_operations = {
 592         .quota_on       = ext3_quota_on,
 593         .quota_off      = vfs_quota_off,
 594         .quota_sync     = vfs_quota_sync,
 595         .get_info       = vfs_get_dqinfo,
 596         .set_info       = vfs_set_dqinfo,
 597         .get_dqblk      = vfs_get_dqblk,
 598         .set_dqblk      = vfs_set_dqblk
 599 };
 600 #endif
 601
 602 static struct super_operations ext3_sops = {
 603         .alloc_inode    = ext3_alloc_inode,
 604         .destroy_inode  = ext3_destroy_inode,
 605         .read_inode     = ext3_read_inode,
 606         .write_inode    = ext3_write_inode,
 607         .dirty_inode    = ext3_dirty_inode,
 608         .delete_inode   = ext3_delete_inode,
 609         .put_super      = ext3_put_super,
 610         .write_super    = ext3_write_super,
 611         .sync_fs        = ext3_sync_fs,
 612         .write_super_lockfs = ext3_write_super_lockfs,
 613         .unlockfs       = ext3_unlockfs,
 614         .statfs         = ext3_statfs,
 615         .remount_fs     = ext3_remount,
 616         .clear_inode    = ext3_clear_inode,
 617         .show_options   = ext3_show_options,
 618 #ifdef CONFIG_QUOTA
 619         .quota_read     = ext3_quota_read,
 620         .quota_write    = ext3_quota_write,
 621 #endif
 622 };
 623
 624 static struct export_operations ext3_export_ops = {
 625         .get_parent = ext3_get_parent,
 626 };
 627
 628 enum {
 629         Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
 630         Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
 631         Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
 632         Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
 633         Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh,
 634         Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
 635         Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
 636         Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
 637         Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
 638         Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
 639         Opt_grpquota
 640 };
 641
 642 static match_table_t tokens = {
 643         {Opt_bsd_df, "bsddf"},
 644         {Opt_minix_df, "minixdf"},
 645         {Opt_grpid, "grpid"},
 646         {Opt_grpid, "bsdgroups"},
 647         {Opt_nogrpid, "nogrpid"},
 648         {Opt_nogrpid, "sysvgroups"},
 649         {Opt_resgid, "resgid=%u"},
 650         {Opt_resuid, "resuid=%u"},
 651         {Opt_sb, "sb=%u"},
 652         {Opt_err_cont, "errors=continue"},
 653         {Opt_err_panic, "errors=panic"},
 654         {Opt_err_ro, "errors=remount-ro"},
 655         {Opt_nouid32, "nouid32"},
 656         {Opt_nocheck, "nocheck"},
 657         {Opt_nocheck, "check=none"},
 658         {Opt_debug, "debug"},
 659         {Opt_oldalloc, "oldalloc"},
 660         {Opt_orlov, "orlov"},
 661         {Opt_user_xattr, "user_xattr"},
 662         {Opt_nouser_xattr, "nouser_xattr"},
 663         {Opt_acl, "acl"},
 664         {Opt_noacl, "noacl"},
 665         {Opt_reservation, "reservation"},
 666         {Opt_noreservation, "noreservation"},
 667         {Opt_noload, "noload"},
 668         {Opt_nobh, "nobh"},
 669         {Opt_commit, "commit=%u"},
 670         {Opt_journal_update, "journal=update"},
 671         {Opt_journal_inum, "journal=%u"},
 672         {Opt_journal_dev, "journal_dev=%u"},
 673         {Opt_abort, "abort"},
 674         {Opt_data_journal, "data=journal"},
 675         {Opt_data_ordered, "data=ordered"},
 676         {Opt_data_writeback, "data=writeback"},
 677         {Opt_offusrjquota, "usrjquota="},
 678         {Opt_usrjquota, "usrjquota=%s"},
 679         {Opt_offgrpjquota, "grpjquota="},
 680         {Opt_grpjquota, "grpjquota=%s"},
 681         {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
 682         {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
 683         {Opt_grpquota, "grpquota"},
 684         {Opt_noquota, "noquota"},
 685         {Opt_quota, "quota"},
 686         {Opt_usrquota, "usrquota"},
 687         {Opt_barrier, "barrier=%u"},
 688         {Opt_err, NULL},
 689         {Opt_resize, "resize"},
 690 };
 691
 692 static unsigned long get_sb_block(void **data)
 693 {
 694         unsigned long   sb_block;
 695         char            *options = (char *) *data;
 696
 697         if (!options || strncmp(options, "sb=", 3) != 0)
 698                 return 1;       /* Default location */
 699         options += 3;
 700         sb_block = simple_strtoul(options, &options, 0);
 701         if (*options && *options != ',') {
 702                 printk("EXT3-fs: Invalid sb specification: %s\n",
 703                        (char *) *data);
 704                 return 1;
 705         }
 706         if (*options == ',')
 707                 options++;
 708         *data = (void *) options;
 709         return sb_block;
 710 }
 711
 712 static int parse_options (char *options, struct super_block *sb,
 713                           unsigned long *inum, unsigned long *journal_devnum,
 714                           unsigned long *n_blocks_count, int is_remount)
 715 {
 716         struct ext3_sb_info *sbi = EXT3_SB(sb);
 717         char * p;
 718         substring_t args[MAX_OPT_ARGS];
 719         int data_opt = 0;
 720         int option;
 721 #ifdef CONFIG_QUOTA
 722         int qtype;
 723         char *qname;
 724 #endif
 725
 726         if (!options)
 727                 return 1;
 728
 729         while ((p = strsep (&options, ",")) != NULL) {
 730                 int token;
 731                 if (!*p)
 732                         continue;
 733
 734                 token = match_token(p, tokens, args);
 735                 switch (token) {
 736                 case Opt_bsd_df:
 737                         clear_opt (sbi->s_mount_opt, MINIX_DF);
 738                         break;
 739                 case Opt_minix_df:
 740                         set_opt (sbi->s_mount_opt, MINIX_DF);
 741                         break;
 742                 case Opt_grpid:
 743                         set_opt (sbi->s_mount_opt, GRPID);
 744                         break;
 745                 case Opt_nogrpid:
 746                         clear_opt (sbi->s_mount_opt, GRPID);
 747                         break;
 748                 case Opt_resuid:
 749                         if (match_int(&args[0], &option))
 750                                 return 0;
 751                         sbi->s_resuid = option;
 752                         break;
 753                 case Opt_resgid:
 754                         if (match_int(&args[0], &option))
 755                                 return 0;
 756                         sbi->s_resgid = option;
 757                         break;
 758                 case Opt_sb:
 759                         /* handled by get_sb_block() instead of here */
 760                         /* *sb_block = match_int(&args[0]); */
 761                         break;
 762                 case Opt_err_panic:
 763                         clear_opt (sbi->s_mount_opt, ERRORS_CONT);
 764                         clear_opt (sbi->s_mount_opt, ERRORS_RO);
 765                         set_opt (sbi->s_mount_opt, ERRORS_PANIC);
 766                         break;
 767                 case Opt_err_ro:
 768                         clear_opt (sbi->s_mount_opt, ERRORS_CONT);
 769                         clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
 770                         set_opt (sbi->s_mount_opt, ERRORS_RO);
 771                         break;
 772                 case Opt_err_cont:
 773                         clear_opt (sbi->s_mount_opt, ERRORS_RO);
 774                         clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
 775                         set_opt (sbi->s_mount_opt, ERRORS_CONT);
 776                         break;
 777                 case Opt_nouid32:
 778                         set_opt (sbi->s_mount_opt, NO_UID32);
 779                         break;
 780                 case Opt_nocheck:
 781                         clear_opt (sbi->s_mount_opt, CHECK);
 782                         break;
 783                 case Opt_debug:
 784                         set_opt (sbi->s_mount_opt, DEBUG);
 785                         break;
 786                 case Opt_oldalloc:
 787                         set_opt (sbi->s_mount_opt, OLDALLOC);
 788                         break;
 789                 case Opt_orlov:
 790                         clear_opt (sbi->s_mount_opt, OLDALLOC);
 791                         break;
 792 #ifdef CONFIG_EXT3_FS_XATTR
 793                 case Opt_user_xattr:
 794                         set_opt (sbi->s_mount_opt, XATTR_USER);
 795                         break;
 796                 case Opt_nouser_xattr:
 797                         clear_opt (sbi->s_mount_opt, XATTR_USER);
 798                         break;
 799 #else
 800                 case Opt_user_xattr:
 801                 case Opt_nouser_xattr:
 802                         printk("EXT3 (no)user_xattr options not supported\n");
 803                         break;
 804 #endif
 805 #ifdef CONFIG_EXT3_FS_POSIX_ACL
 806                 case Opt_acl:
 807                         set_opt(sbi->s_mount_opt, POSIX_ACL);
 808                         break;
 809                 case Opt_noacl:
 810                         clear_opt(sbi->s_mount_opt, POSIX_ACL);
 811                         break;
 812 #else
 813                 case Opt_acl:
 814                 case Opt_noacl:
 815                         printk("EXT3 (no)acl options not supported\n");
 816                         break;
 817 #endif
 818                 case Opt_reservation:
 819                         set_opt(sbi->s_mount_opt, RESERVATION);
 820                         break;
 821                 case Opt_noreservation:
 822                         clear_opt(sbi->s_mount_opt, RESERVATION);
 823                         break;
 824                 case Opt_journal_update:
 825                         /* @@@ FIXME */
 826                         /* Eventually we will want to be able to create
 827                            a journal file here.  For now, only allow the
 828                            user to specify an existing inode to be the
 829                            journal file. */
 830                         if (is_remount) {
 831                                 printk(KERN_ERR "EXT3-fs: cannot specify "
 832                                        "journal on remount\n");
 833                                 return 0;
 834                         }
 835                         set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
 836                         break;
 837                 case Opt_journal_inum:
 838                         if (is_remount) {
 839                                 printk(KERN_ERR "EXT3-fs: cannot specify "
 840                                        "journal on remount\n");
 841                                 return 0;
 842                         }
 843                         if (match_int(&args[0], &option))
 844                                 return 0;
 845                         *inum = option;
 846                         break;
 847                 case Opt_journal_dev:
 848                         if (is_remount) {
 849                                 printk(KERN_ERR "EXT3-fs: cannot specify "
 850                                        "journal on remount\n");
 851                                 return 0;
 852                         }
 853                         if (match_int(&args[0], &option))
 854                                 return 0;
 855                         *journal_devnum = option;
 856                         break;
 857                 case Opt_noload:
 858                         set_opt (sbi->s_mount_opt, NOLOAD);
 859                         break;
 860                 case Opt_commit:
 861                         if (match_int(&args[0], &option))
 862                                 return 0;
 863                         if (option < 0)
 864                                 return 0;
 865                         if (option == 0)
 866                                 option = JBD_DEFAULT_MAX_COMMIT_AGE;
 867                         sbi->s_commit_interval = HZ * option;
 868                         break;
 869                 case Opt_data_journal:
 870                         data_opt = EXT3_MOUNT_JOURNAL_DATA;
 871                         goto datacheck;
 872                 case Opt_data_ordered:
 873                         data_opt = EXT3_MOUNT_ORDERED_DATA;
 874                         goto datacheck;
 875                 case Opt_data_writeback:
 876                         data_opt = EXT3_MOUNT_WRITEBACK_DATA;
 877                 datacheck:
 878                         if (is_remount) {
 879                                 if ((sbi->s_mount_opt & EXT3_MOUNT_DATA_FLAGS)
 880                                                 != data_opt) {
 881                                         printk(KERN_ERR
 882                                                 "EXT3-fs: cannot change data "
 883                                                 "mode on remount\n");
 884                                         return 0;
 885                                 }
 886                         } else {
 887                                 sbi->s_mount_opt &= ~EXT3_MOUNT_DATA_FLAGS;
 888                                 sbi->s_mount_opt |= data_opt;
 889                         }
 890                         break;
 891 #ifdef CONFIG_QUOTA
 892                 case Opt_usrjquota:
 893                         qtype = USRQUOTA;
 894                         goto set_qf_name;
 895                 case Opt_grpjquota:
 896                         qtype = GRPQUOTA;
 897 set_qf_name:
 898                         if (sb_any_quota_enabled(sb)) {
 899                                 printk(KERN_ERR
 900                                         "EXT3-fs: Cannot change journalled "
 901                                         "quota options when quota turned on.\n");
 902                                 return 0;
 903                         }
 904                         qname = match_strdup(&args[0]);
 905                         if (!qname) {
 906                                 printk(KERN_ERR
 907                                         "EXT3-fs: not enough memory for "
 908                                         "storing quotafile name.\n");
 909                                 return 0;
 910                         }
 911                         if (sbi->s_qf_names[qtype] &&
 912                             strcmp(sbi->s_qf_names[qtype], qname)) {
 913                                 printk(KERN_ERR
 914                                         "EXT3-fs: %s quota file already "
 915                                         "specified.\n", QTYPE2NAME(qtype));
 916                                 kfree(qname);
 917                                 return 0;
 918                         }
 919                         sbi->s_qf_names[qtype] = qname;
 920                         if (strchr(sbi->s_qf_names[qtype], '/')) {
 921                                 printk(KERN_ERR
 922                                         "EXT3-fs: quotafile must be on "
 923                                         "filesystem root.\n");
 924                                 kfree(sbi->s_qf_names[qtype]);
 925                                 sbi->s_qf_names[qtype] = NULL;
 926                                 return 0;
 927                         }
 928                         set_opt(sbi->s_mount_opt, QUOTA);
 929                         break;
 930                 case Opt_offusrjquota:
 931                         qtype = USRQUOTA;
 932                         goto clear_qf_name;
 933                 case Opt_offgrpjquota:
 934                         qtype = GRPQUOTA;
 935 clear_qf_name:
 936                         if (sb_any_quota_enabled(sb)) {
 937                                 printk(KERN_ERR "EXT3-fs: Cannot change "
 938                                         "journalled quota options when "
 939                                         "quota turned on.\n");
 940                                 return 0;
 941                         }
 942                         /*
 943                          * The space will be released later when all options
 944                          * are confirmed to be correct
 945                          */
 946                         sbi->s_qf_names[qtype] = NULL;
 947                         break;
 948                 case Opt_jqfmt_vfsold:
 949                         sbi->s_jquota_fmt = QFMT_VFS_OLD;
 950                         break;
 951                 case Opt_jqfmt_vfsv0:
 952                         sbi->s_jquota_fmt = QFMT_VFS_V0;
 953                         break;
 954                 case Opt_quota:
 955                 case Opt_usrquota:
 956                         set_opt(sbi->s_mount_opt, QUOTA);
 957                         set_opt(sbi->s_mount_opt, USRQUOTA);
 958                         break;
 959                 case Opt_grpquota:
 960                         set_opt(sbi->s_mount_opt, QUOTA);
 961                         set_opt(sbi->s_mount_opt, GRPQUOTA);
 962                         break;
 963                 case Opt_noquota:
 964                         if (sb_any_quota_enabled(sb)) {
 965                                 printk(KERN_ERR "EXT3-fs: Cannot change quota "
 966                                         "options when quota turned on.\n");
 967                                 return 0;
 968                         }
 969                         clear_opt(sbi->s_mount_opt, QUOTA);
 970                         clear_opt(sbi->s_mount_opt, USRQUOTA);
 971                         clear_opt(sbi->s_mount_opt, GRPQUOTA);
 972                         break;
 973 #else
 974                 case Opt_quota:
 975                 case Opt_usrquota:
 976                 case Opt_grpquota:
 977                 case Opt_usrjquota:
 978                 case Opt_grpjquota:
 979                 case Opt_offusrjquota:
 980                 case Opt_offgrpjquota:
 981                 case Opt_jqfmt_vfsold:
 982                 case Opt_jqfmt_vfsv0:
 983                         printk(KERN_ERR
 984                                 "EXT3-fs: journalled quota options not "
 985                                 "supported.\n");
 986                         break;
 987                 case Opt_noquota:
 988                         break;
 989 #endif
 990                 case Opt_abort:
 991                         set_opt(sbi->s_mount_opt, ABORT);
 992                         break;
 993                 case Opt_barrier:
 994                         if (match_int(&args[0], &option))
 995                                 return 0;
 996                         if (option)
 997                                 set_opt(sbi->s_mount_opt, BARRIER);
 998                         else
 999                                 clear_opt(sbi->s_mount_opt, BARRIER);
1000                         break;
1001                 case Opt_ignore:
1002                         break;
1003                 case Opt_resize:
1004                         if (!is_remount) {
1005                                 printk("EXT3-fs: resize option only available "
1006                                         "for remount\n");
1007                                 return 0;
1008                         }
1009                         if (match_int(&args[0], &option) != 0)
1010                                 return 0;
1011                         *n_blocks_count = option;
1012                         break;
1013                 case Opt_nobh:
1014                         set_opt(sbi->s_mount_opt, NOBH);
1015                         break;
1016                 default:
1017                         printk (KERN_ERR
1018                                 "EXT3-fs: Unrecognized mount option \"%s\" "
1019                                 "or missing value\n", p);
1020                         return 0;
1021                 }
1022         }
1023 #ifdef CONFIG_QUOTA
1024         if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1025                 if ((sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA) &&
1026                      sbi->s_qf_names[USRQUOTA])
1027                         clear_opt(sbi->s_mount_opt, USRQUOTA);
1028
1029                 if ((sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA) &&
1030                      sbi->s_qf_names[GRPQUOTA])
1031                         clear_opt(sbi->s_mount_opt, GRPQUOTA);
1032
1033                 if ((sbi->s_qf_names[USRQUOTA] &&
1034                                 (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)) ||
1035                     (sbi->s_qf_names[GRPQUOTA] &&
1036                                 (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA))) {
1037                         printk(KERN_ERR "EXT3-fs: old and new quota "
1038                                         "format mixing.\n");
1039                         return 0;
1040                 }
1041
1042                 if (!sbi->s_jquota_fmt) {
1043                         printk(KERN_ERR "EXT3-fs: journalled quota format "
1044                                         "not specified.\n");
1045                         return 0;
1046                 }
1047         } else {
1048                 if (sbi->s_jquota_fmt) {
1049                         printk(KERN_ERR "EXT3-fs: journalled quota format "
1050                                         "specified with no journalling "
1051                                         "enabled.\n");
1052                         return 0;
1053                 }
1054         }
1055 #endif
1056         return 1;
1057 }
1058
1059 static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1060                             int read_only)
1061 {
1062         struct ext3_sb_info *sbi = EXT3_SB(sb);
1063         int res = 0;
1064
1065         if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
1066                 printk (KERN_ERR "EXT3-fs warning: revision level too high, "
1067                         "forcing read-only mode\n");
1068                 res = MS_RDONLY;
1069         }
1070         if (read_only)
1071                 return res;
1072         if (!(sbi->s_mount_state & EXT3_VALID_FS))
1073                 printk (KERN_WARNING "EXT3-fs warning: mounting unchecked fs, "
1074                         "running e2fsck is recommended\n");
1075         else if ((sbi->s_mount_state & EXT3_ERROR_FS))
1076                 printk (KERN_WARNING
1077                         "EXT3-fs warning: mounting fs with errors, "
1078                         "running e2fsck is recommended\n");
1079         else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1080                  le16_to_cpu(es->s_mnt_count) >=
1081                  (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1082                 printk (KERN_WARNING
1083                         "EXT3-fs warning: maximal mount count reached, "
1084                         "running e2fsck is recommended\n");
1085         else if (le32_to_cpu(es->s_checkinterval) &&
1086                 (le32_to_cpu(es->s_lastcheck) +
1087                         le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1088                 printk (KERN_WARNING
1089                         "EXT3-fs warning: checktime reached, "
1090                         "running e2fsck is recommended\n");
1091 #if 0
1092                 /* @@@ We _will_ want to clear the valid bit if we find
1093                    inconsistencies, to force a fsck at reboot.  But for
1094                    a plain journaled filesystem we can keep it set as
1095                    valid forever! :) */
1096         es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & ~EXT3_VALID_FS);
1097 #endif
1098         if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1099                 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
1100         es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1);
1101         es->s_mtime = cpu_to_le32(get_seconds());
1102         ext3_update_dynamic_rev(sb);
1103         EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1104
1105         ext3_commit_super(sb, es, 1);
1106         if (test_opt(sb, DEBUG))
1107                 printk(KERN_INFO "[EXT3 FS bs=%lu, gc=%lu, "
1108                                 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1109                         sb->s_blocksize,
1110                         sbi->s_groups_count,
1111                         EXT3_BLOCKS_PER_GROUP(sb),
1112                         EXT3_INODES_PER_GROUP(sb),
1113                         sbi->s_mount_opt);
1114
1115         printk(KERN_INFO "EXT3 FS on %s, ", sb->s_id);
1116         if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1117                 char b[BDEVNAME_SIZE];
1118
1119                 printk("external journal on %s\n",
1120                         bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1121         } else {
1122                 printk("internal journal\n");
1123         }
1124         return res;
1125 }
1126
1127 /* Called at mount-time, super-block is locked */
1128 static int ext3_check_descriptors (struct super_block * sb)
1129 {
1130         struct ext3_sb_info *sbi = EXT3_SB(sb);
1131         unsigned long block = le32_to_cpu(sbi->s_es->s_first_data_block);
1132         struct ext3_group_desc * gdp = NULL;
1133         int desc_block = 0;
1134         int i;
1135
1136         ext3_debug ("Checking group descriptors");
1137
1138         for (i = 0; i < sbi->s_groups_count; i++)
1139         {
1140                 if ((i % EXT3_DESC_PER_BLOCK(sb)) == 0)
1141                         gdp = (struct ext3_group_desc *)
1142                                         sbi->s_group_desc[desc_block++]->b_data;
1143                 if (le32_to_cpu(gdp->bg_block_bitmap) < block ||
1144                     le32_to_cpu(gdp->bg_block_bitmap) >=
1145                                 block + EXT3_BLOCKS_PER_GROUP(sb))
1146                 {
1147                         ext3_error (sb, "ext3_check_descriptors",
1148                                     "Block bitmap for group %d"
1149                                     " not in group (block %lu)!",
1150                                     i, (unsigned long)
1151                                         le32_to_cpu(gdp->bg_block_bitmap));
1152                         return 0;
1153                 }
1154                 if (le32_to_cpu(gdp->bg_inode_bitmap) < block ||
1155                     le32_to_cpu(gdp->bg_inode_bitmap) >=
1156                                 block + EXT3_BLOCKS_PER_GROUP(sb))
1157                 {
1158                         ext3_error (sb, "ext3_check_descriptors",
1159                                     "Inode bitmap for group %d"
1160                                     " not in group (block %lu)!",
1161                                     i, (unsigned long)
1162                                         le32_to_cpu(gdp->bg_inode_bitmap));
1163                         return 0;
1164                 }
1165                 if (le32_to_cpu(gdp->bg_inode_table) < block ||
1166                     le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group >=
1167                     block + EXT3_BLOCKS_PER_GROUP(sb))
1168                 {
1169                         ext3_error (sb, "ext3_check_descriptors",
1170                                     "Inode table for group %d"
1171                                     " not in group (block %lu)!",
1172                                     i, (unsigned long)
1173                                         le32_to_cpu(gdp->bg_inode_table));
1174                         return 0;
1175                 }
1176                 block += EXT3_BLOCKS_PER_GROUP(sb);
1177                 gdp++;
1178         }
1179
1180         sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1181         sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1182         return 1;
1183 }
1184
1185
1186 /* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1187  * the superblock) which were deleted from all directories, but held open by
1188  * a process at the time of a crash.  We walk the list and try to delete these
1189  * inodes at recovery time (only with a read-write filesystem).
1190  *
1191  * In order to keep the orphan inode chain consistent during traversal (in
1192  * case of crash during recovery), we link each inode into the superblock
1193  * orphan list_head and handle it the same way as an inode deletion during
1194  * normal operation (which journals the operations for us).
1195  *
1196  * We only do an iget() and an iput() on each inode, which is very safe if we
1197  * accidentally point at an in-use or already deleted inode.  The worst that
1198  * can happen in this case is that we get a "bit already cleared" message from
1199  * ext3_free_inode().  The only reason we would point at a wrong inode is if
1200  * e2fsck was run on this filesystem, and it must have already done the orphan
1201  * inode cleanup for us, so we can safely abort without any further action.
1202  */
1203 static void ext3_orphan_cleanup (struct super_block * sb,
1204                                  struct ext3_super_block * es)
1205 {
1206         unsigned int s_flags = sb->s_flags;
1207         int nr_orphans = 0, nr_truncates = 0;
1208 #ifdef CONFIG_QUOTA
1209         int i;
1210 #endif
1211         if (!es->s_last_orphan) {
1212                 jbd_debug(4, "no orphan inodes to clean up\n");
1213                 return;
1214         }
1215
1216         if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1217                 if (es->s_last_orphan)
1218                         jbd_debug(1, "Errors on filesystem, "
1219                                   "clearing orphan list.\n");
1220                 es->s_last_orphan = 0;
1221                 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1222                 return;
1223         }
1224
1225         if (s_flags & MS_RDONLY) {
1226                 printk(KERN_INFO "EXT3-fs: %s: orphan cleanup on readonly fs\n",
1227                        sb->s_id);
1228                 sb->s_flags &= ~MS_RDONLY;
1229         }
1230 #ifdef CONFIG_QUOTA
1231         /* Needed for iput() to work correctly and not trash data */
1232         sb->s_flags |= MS_ACTIVE;
1233         /* Turn on quotas so that they are updated correctly */
1234         for (i = 0; i < MAXQUOTAS; i++) {
1235                 if (EXT3_SB(sb)->s_qf_names[i]) {
1236                         int ret = ext3_quota_on_mount(sb, i);
1237                         if (ret < 0)
1238                                 printk(KERN_ERR
1239                                         "EXT3-fs: Cannot turn on journalled "
1240                                         "quota: error %d\n", ret);
1241                 }
1242         }
1243 #endif
1244
1245         while (es->s_last_orphan) {
1246                 struct inode *inode;
1247
1248                 if (!(inode =
1249                       ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan)))) {
1250                         es->s_last_orphan = 0;
1251                         break;
1252                 }
1253
1254                 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1255                 DQUOT_INIT(inode);
1256                 if (inode->i_nlink) {
1257                         printk(KERN_DEBUG
1258                                 "%s: truncating inode %ld to %Ld bytes\n",
1259                                 __FUNCTION__, inode->i_ino, inode->i_size);
1260                         jbd_debug(2, "truncating inode %ld to %Ld bytes\n",
1261                                   inode->i_ino, inode->i_size);
1262                         ext3_truncate(inode);
1263                         nr_truncates++;
1264                 } else {
1265                         printk(KERN_DEBUG
1266                                 "%s: deleting unreferenced inode %ld\n",
1267                                 __FUNCTION__, inode->i_ino);
1268                         jbd_debug(2, "deleting unreferenced inode %ld\n",
1269                                   inode->i_ino);
1270                         nr_orphans++;
1271                 }
1272                 iput(inode);  /* The delete magic happens here! */
1273         }
1274
1275 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1276
1277         if (nr_orphans)
1278                 printk(KERN_INFO "EXT3-fs: %s: %d orphan inode%s deleted\n",
1279                        sb->s_id, PLURAL(nr_orphans));
1280         if (nr_truncates)
1281                 printk(KERN_INFO "EXT3-fs: %s: %d truncate%s cleaned up\n",
1282                        sb->s_id, PLURAL(nr_truncates));
1283 #ifdef CONFIG_QUOTA
1284         /* Turn quotas off */
1285         for (i = 0; i < MAXQUOTAS; i++) {
1286                 if (sb_dqopt(sb)->files[i])
1287                         vfs_quota_off(sb, i);
1288         }
1289 #endif
1290         sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1291 }
1292
1293 #define log2(n) ffz(~(n))
1294
1295 /*
1296  * Maximal file size.  There is a direct, and {,double-,triple-}indirect
1297  * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1298  * We need to be 1 filesystem block less than the 2^32 sector limit.
1299  */
1300 static loff_t ext3_max_size(int bits)
1301 {
1302         loff_t res = EXT3_NDIR_BLOCKS;
1303         /* This constant is calculated to be the largest file size for a
1304          * dense, 4k-blocksize file such that the total number of
1305          * sectors in the file, including data and all indirect blocks,
1306          * does not exceed 2^32. */
1307         const loff_t upper_limit = 0x1ff7fffd000LL;
1308
1309         res += 1LL << (bits-2);
1310         res += 1LL << (2*(bits-2));
1311         res += 1LL << (3*(bits-2));
1312         res <<= bits;
1313         if (res > upper_limit)
1314                 res = upper_limit;
1315         return res;
1316 }
1317
1318 static unsigned long descriptor_loc(struct super_block *sb,
1319                                     unsigned long logic_sb_block,
1320                                     int nr)
1321 {
1322         struct ext3_sb_info *sbi = EXT3_SB(sb);
1323         unsigned long bg, first_data_block, first_meta_bg;
1324         int has_super = 0;
1325
1326         first_data_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1327         first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1328
1329         if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1330             nr < first_meta_bg)
1331                 return (logic_sb_block + nr + 1);
1332         bg = sbi->s_desc_per_block * nr;
1333         if (ext3_bg_has_super(sb, bg))
1334                 has_super = 1;
1335         return (first_data_block + has_super + (bg * sbi->s_blocks_per_group));
1336 }
1337
1338
1339 static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1340 {
1341         struct buffer_head * bh;
1342         struct ext3_super_block *es = NULL;
1343         struct ext3_sb_info *sbi;
1344         unsigned long block;
1345         unsigned long sb_block = get_sb_block(&data);
1346         unsigned long logic_sb_block;
1347         unsigned long offset = 0;
1348         unsigned long journal_inum = 0;
1349         unsigned long journal_devnum = 0;
1350         unsigned long def_mount_opts;
1351         struct inode *root;
1352         int blocksize;
1353         int hblock;
1354         int db_count;
1355         int i;
1356         int needs_recovery;
1357         __le32 features;
1358
1359         sbi = kmalloc(sizeof(*sbi), GFP_KERNEL);
1360         if (!sbi)
1361                 return -ENOMEM;
1362         sb->s_fs_info = sbi;
1363         memset(sbi, 0, sizeof(*sbi));
1364         sbi->s_mount_opt = 0;
1365         sbi->s_resuid = EXT3_DEF_RESUID;
1366         sbi->s_resgid = EXT3_DEF_RESGID;
1367
1368         unlock_kernel();
1369
1370         blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1371         if (!blocksize) {
1372                 printk(KERN_ERR "EXT3-fs: unable to set blocksize\n");
1373                 goto out_fail;
1374         }
1375
1376         /*
1377          * The ext3 superblock will not be buffer aligned for other than 1kB
1378          * block sizes.  We need to calculate the offset from buffer start.
1379          */
1380         if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1381                 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1382                 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1383         } else {
1384                 logic_sb_block = sb_block;
1385         }
1386
1387         if (!(bh = sb_bread(sb, logic_sb_block))) {
1388                 printk (KERN_ERR "EXT3-fs: unable to read superblock\n");
1389                 goto out_fail;
1390         }
1391         /*
1392          * Note: s_es must be initialized as soon as possible because
1393          *       some ext3 macro-instructions depend on its value
1394          */
1395         es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1396         sbi->s_es = es;
1397         sb->s_magic = le16_to_cpu(es->s_magic);
1398         if (sb->s_magic != EXT3_SUPER_MAGIC)
1399                 goto cantfind_ext3;
1400
1401         /* Set defaults before we parse the mount options */
1402         def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1403         if (def_mount_opts & EXT3_DEFM_DEBUG)
1404                 set_opt(sbi->s_mount_opt, DEBUG);
1405         if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1406                 set_opt(sbi->s_mount_opt, GRPID);
1407         if (def_mount_opts & EXT3_DEFM_UID16)
1408                 set_opt(sbi->s_mount_opt, NO_UID32);
1409         if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1410                 set_opt(sbi->s_mount_opt, XATTR_USER);
1411         if (def_mount_opts & EXT3_DEFM_ACL)
1412                 set_opt(sbi->s_mount_opt, POSIX_ACL);
1413         if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1414                 sbi->s_mount_opt |= EXT3_MOUNT_JOURNAL_DATA;
1415         else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1416                 sbi->s_mount_opt |= EXT3_MOUNT_ORDERED_DATA;
1417         else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1418                 sbi->s_mount_opt |= EXT3_MOUNT_WRITEBACK_DATA;
1419
1420         if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1421                 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1422         else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_RO)
1423                 set_opt(sbi->s_mount_opt, ERRORS_RO);
1424
1425         sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1426         sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1427
1428         set_opt(sbi->s_mount_opt, RESERVATION);
1429
1430         if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1431                             NULL, 0))
1432                 goto failed_mount;
1433
1434         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1435                 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1436
1437         if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1438             (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1439              EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1440              EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1441                 printk(KERN_WARNING
1442                        "EXT3-fs warning: feature flags set on rev 0 fs, "
1443                        "running e2fsck is recommended\n");
1444         /*
1445          * Check feature flags regardless of the revision level, since we
1446          * previously didn't change the revision level when setting the flags,
1447          * so there is a chance incompat flags are set on a rev 0 filesystem.
1448          */
1449         features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1450         if (features) {
1451                 printk(KERN_ERR "EXT3-fs: %s: couldn't mount because of "
1452                        "unsupported optional features (%x).\n",
1453                        sb->s_id, le32_to_cpu(features));
1454                 goto failed_mount;
1455         }
1456         features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1457         if (!(sb->s_flags & MS_RDONLY) && features) {
1458                 printk(KERN_ERR "EXT3-fs: %s: couldn't mount RDWR because of "
1459                        "unsupported optional features (%x).\n",
1460                        sb->s_id, le32_to_cpu(features));
1461                 goto failed_mount;
1462         }
1463         blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1464
1465         if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1466             blocksize > EXT3_MAX_BLOCK_SIZE) {
1467                 printk(KERN_ERR
1468                        "EXT3-fs: Unsupported filesystem blocksize %d on %s.\n",
1469                        blocksize, sb->s_id);
1470                 goto failed_mount;
1471         }
1472
1473         hblock = bdev_hardsect_size(sb->s_bdev);
1474         if (sb->s_blocksize != blocksize) {
1475                 /*
1476                  * Make sure the blocksize for the filesystem is larger
1477                  * than the hardware sectorsize for the machine.
1478                  */
1479                 if (blocksize < hblock) {
1480                         printk(KERN_ERR "EXT3-fs: blocksize %d too small for "
1481                                "device blocksize %d.\n", blocksize, hblock);
1482                         goto failed_mount;
1483                 }
1484
1485                 brelse (bh);
1486                 sb_set_blocksize(sb, blocksize);
1487                 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1488                 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1489                 bh = sb_bread(sb, logic_sb_block);
1490                 if (!bh) {
1491                         printk(KERN_ERR
1492                                "EXT3-fs: Can't read superblock on 2nd try.\n");
1493                         goto failed_mount;
1494                 }
1495                 es = (struct ext3_super_block *)(((char *)bh->b_data) + offset);
1496                 sbi->s_es = es;
1497                 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
1498                         printk (KERN_ERR
1499                                 "EXT3-fs: Magic mismatch, very weird !\n");
1500                         goto failed_mount;
1501                 }
1502         }
1503
1504         sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1505
1506         if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1507                 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1508                 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1509         } else {
1510                 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1511                 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1512                 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
1513                     (sbi->s_inode_size & (sbi->s_inode_size - 1)) ||
1514                     (sbi->s_inode_size > blocksize)) {
1515                         printk (KERN_ERR
1516                                 "EXT3-fs: unsupported inode size: %d\n",
1517                                 sbi->s_inode_size);
1518                         goto failed_mount;
1519                 }
1520         }
1521         sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1522                                    le32_to_cpu(es->s_log_frag_size);
1523         if (blocksize != sbi->s_frag_size) {
1524                 printk(KERN_ERR
1525                        "EXT3-fs: fragsize %lu != blocksize %u (unsupported)\n",
1526                        sbi->s_frag_size, blocksize);
1527                 goto failed_mount;
1528         }
1529         sbi->s_frags_per_block = 1;
1530         sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1531         sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1532         sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1533         if (EXT3_INODE_SIZE(sb) == 0)
1534                 goto cantfind_ext3;
1535         sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1536         if (sbi->s_inodes_per_block == 0)
1537                 goto cantfind_ext3;
1538         sbi->s_itb_per_group = sbi->s_inodes_per_group /
1539                                         sbi->s_inodes_per_block;
1540         sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1541         sbi->s_sbh = bh;
1542         sbi->s_mount_state = le16_to_cpu(es->s_state);
1543         sbi->s_addr_per_block_bits = log2(EXT3_ADDR_PER_BLOCK(sb));
1544         sbi->s_desc_per_block_bits = log2(EXT3_DESC_PER_BLOCK(sb));
1545         for (i=0; i < 4; i++)
1546                 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1547         sbi->s_def_hash_version = es->s_def_hash_version;
1548
1549         if (sbi->s_blocks_per_group > blocksize * 8) {
1550                 printk (KERN_ERR
1551                         "EXT3-fs: #blocks per group too big: %lu\n",
1552                         sbi->s_blocks_per_group);
1553                 goto failed_mount;
1554         }
1555         if (sbi->s_frags_per_group > blocksize * 8) {
1556                 printk (KERN_ERR
1557                         "EXT3-fs: #fragments per group too big: %lu\n",
1558                         sbi->s_frags_per_group);
1559                 goto failed_mount;
1560         }
1561         if (sbi->s_inodes_per_group > blocksize * 8) {
1562                 printk (KERN_ERR
1563                         "EXT3-fs: #inodes per group too big: %lu\n",
1564                         sbi->s_inodes_per_group);
1565                 goto failed_mount;
1566         }
1567
1568         if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1569                 goto cantfind_ext3;
1570         sbi->s_groups_count = (le32_to_cpu(es->s_blocks_count) -
1571                                le32_to_cpu(es->s_first_data_block) +
1572                                EXT3_BLOCKS_PER_GROUP(sb) - 1) /
1573                               EXT3_BLOCKS_PER_GROUP(sb);
1574         db_count = (sbi->s_groups_count + EXT3_DESC_PER_BLOCK(sb) - 1) /
1575                    EXT3_DESC_PER_BLOCK(sb);
1576         sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1577                                     GFP_KERNEL);
1578         if (sbi->s_group_desc == NULL) {
1579                 printk (KERN_ERR "EXT3-fs: not enough memory\n");
1580                 goto failed_mount;
1581         }
1582
1583         bgl_lock_init(&sbi->s_blockgroup_lock);
1584
1585         for (i = 0; i < db_count; i++) {
1586                 block = descriptor_loc(sb, logic_sb_block, i);
1587                 sbi->s_group_desc[i] = sb_bread(sb, block);
1588                 if (!sbi->s_group_desc[i]) {
1589                         printk (KERN_ERR "EXT3-fs: "
1590                                 "can't read group descriptor %d\n", i);
1591                         db_count = i;
1592                         goto failed_mount2;
1593                 }
1594         }
1595         if (!ext3_check_descriptors (sb)) {
1596                 printk (KERN_ERR "EXT3-fs: group descriptors corrupted !\n");
1597                 goto failed_mount2;
1598         }
1599         sbi->s_gdb_count = db_count;
1600         get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1601         spin_lock_init(&sbi->s_next_gen_lock);
1602
1603         percpu_counter_init(&sbi->s_freeblocks_counter,
1604                 ext3_count_free_blocks(sb));
1605         percpu_counter_init(&sbi->s_freeinodes_counter,
1606                 ext3_count_free_inodes(sb));
1607         percpu_counter_init(&sbi->s_dirs_counter,
1608                 ext3_count_dirs(sb));
1609
1610         /* per fileystem reservation list head & lock */
1611         spin_lock_init(&sbi->s_rsv_window_lock);
1612         sbi->s_rsv_window_root = RB_ROOT;
1613         /* Add a single, static dummy reservation to the start of the
1614          * reservation window list --- it gives us a placeholder for
1615          * append-at-start-of-list which makes the allocation logic
1616          * _much_ simpler. */
1617         sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1618         sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1619         sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1620         sbi->s_rsv_window_head.rsv_goal_size = 0;
1621         ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1622
1623         /*
1624          * set up enough so that it can read an inode
1625          */
1626         sb->s_op = &ext3_sops;
1627         sb->s_export_op = &ext3_export_ops;
1628         sb->s_xattr = ext3_xattr_handlers;
1629 #ifdef CONFIG_QUOTA
1630         sb->s_qcop = &ext3_qctl_operations;
1631         sb->dq_op = &ext3_quota_operations;
1632 #endif
1633         INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1634
1635         sb->s_root = NULL;
1636
1637         needs_recovery = (es->s_last_orphan != 0 ||
1638                           EXT3_HAS_INCOMPAT_FEATURE(sb,
1639                                     EXT3_FEATURE_INCOMPAT_RECOVER));
1640
1641         /*
1642          * The first inode we look at is the journal inode.  Don't try
1643          * root first: it may be modified in the journal!
1644          */
1645         if (!test_opt(sb, NOLOAD) &&
1646             EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
1647                 if (ext3_load_journal(sb, es, journal_devnum))
1648                         goto failed_mount3;
1649         } else if (journal_inum) {
1650                 if (ext3_create_journal(sb, es, journal_inum))
1651                         goto failed_mount3;
1652         } else {
1653                 if (!silent)
1654                         printk (KERN_ERR
1655                                 "ext3: No journal on filesystem on %s\n",
1656                                 sb->s_id);
1657                 goto failed_mount3;
1658         }
1659
1660         /* We have now updated the journal if required, so we can
1661          * validate the data journaling mode. */
1662         switch (test_opt(sb, DATA_FLAGS)) {
1663         case 0:
1664                 /* No mode set, assume a default based on the journal
1665                    capabilities: ORDERED_DATA if the journal can
1666                    cope, else JOURNAL_DATA */
1667                 if (journal_check_available_features
1668                     (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
1669                         set_opt(sbi->s_mount_opt, ORDERED_DATA);
1670                 else
1671                         set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1672                 break;
1673
1674         case EXT3_MOUNT_ORDERED_DATA:
1675         case EXT3_MOUNT_WRITEBACK_DATA:
1676                 if (!journal_check_available_features
1677                     (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
1678                         printk(KERN_ERR "EXT3-fs: Journal does not support "
1679                                "requested data journaling mode\n");
1680                         goto failed_mount4;
1681                 }
1682         default:
1683                 break;
1684         }
1685
1686         if (test_opt(sb, NOBH)) {
1687                 if (!(test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)) {
1688                         printk(KERN_WARNING "EXT3-fs: Ignoring nobh option - "
1689                                 "its supported only with writeback mode\n");
1690                         clear_opt(sbi->s_mount_opt, NOBH);
1691                 }
1692         }
1693         /*
1694          * The journal_load will have done any necessary log recovery,
1695          * so we can safely mount the rest of the filesystem now.
1696          */
1697
1698         root = iget(sb, EXT3_ROOT_INO);
1699         sb->s_root = d_alloc_root(root);
1700         if (!sb->s_root) {
1701                 printk(KERN_ERR "EXT3-fs: get root inode failed\n");
1702                 iput(root);
1703                 goto failed_mount4;
1704         }
1705         if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1706                 dput(sb->s_root);
1707                 sb->s_root = NULL;
1708                 printk(KERN_ERR "EXT3-fs: corrupt root inode, run e2fsck\n");
1709                 goto failed_mount4;
1710         }
1711
1712         ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
1713         /*
1714          * akpm: core read_super() calls in here with the superblock locked.
1715          * That deadlocks, because orphan cleanup needs to lock the superblock
1716          * in numerous places.  Here we just pop the lock - it's relatively
1717          * harmless, because we are now ready to accept write_super() requests,
1718          * and aviro says that's the only reason for hanging onto the
1719          * superblock lock.
1720          */
1721         EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
1722         ext3_orphan_cleanup(sb, es);
1723         EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
1724         if (needs_recovery)
1725                 printk (KERN_INFO "EXT3-fs: recovery complete.\n");
1726         ext3_mark_recovery_complete(sb, es);
1727         printk (KERN_INFO "EXT3-fs: mounted filesystem with %s data mode.\n",
1728                 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
1729                 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
1730                 "writeback");
1731
1732         lock_kernel();
1733         return 0;
1734
1735 cantfind_ext3:
1736         if (!silent)
1737                 printk(KERN_ERR "VFS: Can't find ext3 filesystem on dev %s.\n",
1738                        sb->s_id);
1739         goto failed_mount;
1740
1741 failed_mount4:
1742         journal_destroy(sbi->s_journal);
1743 failed_mount3:
1744         percpu_counter_destroy(&sbi->s_freeblocks_counter);
1745         percpu_counter_destroy(&sbi->s_freeinodes_counter);
1746         percpu_counter_destroy(&sbi->s_dirs_counter);
1747 failed_mount2:
1748         for (i = 0; i < db_count; i++)
1749                 brelse(sbi->s_group_desc[i]);
1750         kfree(sbi->s_group_desc);
1751 failed_mount:
1752 #ifdef CONFIG_QUOTA
1753         for (i = 0; i < MAXQUOTAS; i++)
1754                 kfree(sbi->s_qf_names[i]);
1755 #endif
1756         ext3_blkdev_remove(sbi);
1757         brelse(bh);
1758 out_fail:
1759         sb->s_fs_info = NULL;
1760         kfree(sbi);
1761         lock_kernel();
1762         return -EINVAL;
1763 }
1764
1765 /*
1766  * Setup any per-fs journal parameters now.  We'll do this both on
1767  * initial mount, once the journal has been initialised but before we've
1768  * done any recovery; and again on any subsequent remount.
1769  */
1770 static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
1771 {
1772         struct ext3_sb_info *sbi = EXT3_SB(sb);
1773
1774         if (sbi->s_commit_interval)
1775                 journal->j_commit_interval = sbi->s_commit_interval;
1776         /* We could also set up an ext3-specific default for the commit
1777          * interval here, but for now we'll just fall back to the jbd
1778          * default. */
1779
1780         spin_lock(&journal->j_state_lock);
1781         if (test_opt(sb, BARRIER))
1782                 journal->j_flags |= JFS_BARRIER;
1783         else
1784                 journal->j_flags &= ~JFS_BARRIER;
1785         spin_unlock(&journal->j_state_lock);
1786 }
1787
1788 static journal_t *ext3_get_journal(struct super_block *sb, int journal_inum)
1789 {
1790         struct inode *journal_inode;
1791         journal_t *journal;
1792
1793         /* First, test for the existence of a valid inode on disk.  Bad
1794          * things happen if we iget() an unused inode, as the subsequent
1795          * iput() will try to delete it. */
1796
1797         journal_inode = iget(sb, journal_inum);
1798         if (!journal_inode) {
1799                 printk(KERN_ERR "EXT3-fs: no journal found.\n");
1800                 return NULL;
1801         }
1802         if (!journal_inode->i_nlink) {
1803                 make_bad_inode(journal_inode);
1804                 iput(journal_inode);
1805                 printk(KERN_ERR "EXT3-fs: journal inode is deleted.\n");
1806                 return NULL;
1807         }
1808
1809         jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
1810                   journal_inode, journal_inode->i_size);
1811         if (is_bad_inode(journal_inode) || !S_ISREG(journal_inode->i_mode)) {
1812                 printk(KERN_ERR "EXT3-fs: invalid journal inode.\n");
1813                 iput(journal_inode);
1814                 return NULL;
1815         }
1816
1817         journal = journal_init_inode(journal_inode);
1818         if (!journal) {
1819                 printk(KERN_ERR "EXT3-fs: Could not load journal inode\n");
1820                 iput(journal_inode);
1821                 return NULL;
1822         }
1823         journal->j_private = sb;
1824         ext3_init_journal_params(sb, journal);
1825         return journal;
1826 }
1827
1828 static journal_t *ext3_get_dev_journal(struct super_block *sb,
1829                                        dev_t j_dev)
1830 {
1831         struct buffer_head * bh;
1832         journal_t *journal;
1833         int start;
1834         int len;
1835         int hblock, blocksize;
1836         unsigned long sb_block;
1837         unsigned long offset;
1838         struct ext3_super_block * es;
1839         struct block_device *bdev;
1840
1841         bdev = ext3_blkdev_get(j_dev);
1842         if (bdev == NULL)
1843                 return NULL;
1844
1845         if (bd_claim(bdev, sb)) {
1846                 printk(KERN_ERR
1847                         "EXT3: failed to claim external journal device.\n");
1848                 blkdev_put(bdev);
1849                 return NULL;
1850         }
1851
1852         blocksize = sb->s_blocksize;
1853         hblock = bdev_hardsect_size(bdev);
1854         if (blocksize < hblock) {
1855                 printk(KERN_ERR
1856                         "EXT3-fs: blocksize too small for journal device.\n");
1857                 goto out_bdev;
1858         }
1859
1860         sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
1861         offset = EXT3_MIN_BLOCK_SIZE % blocksize;
1862         set_blocksize(bdev, blocksize);
1863         if (!(bh = __bread(bdev, sb_block, blocksize))) {
1864                 printk(KERN_ERR "EXT3-fs: couldn't read superblock of "
1865                        "external journal\n");
1866                 goto out_bdev;
1867         }
1868
1869         es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1870         if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
1871             !(le32_to_cpu(es->s_feature_incompat) &
1872               EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
1873                 printk(KERN_ERR "EXT3-fs: external journal has "
1874                                         "bad superblock\n");
1875                 brelse(bh);
1876                 goto out_bdev;
1877         }
1878
1879         if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
1880                 printk(KERN_ERR "EXT3-fs: journal UUID does not match\n");
1881                 brelse(bh);
1882                 goto out_bdev;
1883         }
1884
1885         len = le32_to_cpu(es->s_blocks_count);
1886         start = sb_block + 1;
1887         brelse(bh);     /* we're done with the superblock */
1888
1889         journal = journal_init_dev(bdev, sb->s_bdev,
1890                                         start, len, blocksize);
1891         if (!journal) {
1892                 printk(KERN_ERR "EXT3-fs: failed to create device journal\n");
1893                 goto out_bdev;
1894         }
1895         journal->j_private = sb;
1896         ll_rw_block(READ, 1, &journal->j_sb_buffer);
1897         wait_on_buffer(journal->j_sb_buffer);
1898         if (!buffer_uptodate(journal->j_sb_buffer)) {
1899                 printk(KERN_ERR "EXT3-fs: I/O error on journal device\n");
1900                 goto out_journal;
1901         }
1902         if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
1903                 printk(KERN_ERR "EXT3-fs: External journal has more than one "
1904                                         "user (unsupported) - %d\n",
1905                         be32_to_cpu(journal->j_superblock->s_nr_users));
1906                 goto out_journal;
1907         }
1908         EXT3_SB(sb)->journal_bdev = bdev;
1909         ext3_init_journal_params(sb, journal);
1910         return journal;
1911 out_journal:
1912         journal_destroy(journal);
1913 out_bdev:
1914         ext3_blkdev_put(bdev);
1915         return NULL;
1916 }
1917
1918 static int ext3_load_journal(struct super_block *sb,
1919                              struct ext3_super_block *es,
1920                              unsigned long journal_devnum)
1921 {
1922         journal_t *journal;
1923         int journal_inum = le32_to_cpu(es->s_journal_inum);
1924         dev_t journal_dev;
1925         int err = 0;
1926         int really_read_only;
1927
1928         if (journal_devnum &&
1929             journal_devnum != le32_to_cpu(es->s_journal_dev)) {
1930                 printk(KERN_INFO "EXT3-fs: external journal device major/minor "
1931                         "numbers have changed\n");
1932                 journal_dev = new_decode_dev(journal_devnum);
1933         } else
1934                 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
1935
1936         really_read_only = bdev_read_only(sb->s_bdev);
1937
1938         /*
1939          * Are we loading a blank journal or performing recovery after a
1940          * crash?  For recovery, we need to check in advance whether we
1941          * can get read-write access to the device.
1942          */
1943
1944         if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
1945                 if (sb->s_flags & MS_RDONLY) {
1946                         printk(KERN_INFO "EXT3-fs: INFO: recovery "
1947                                         "required on readonly filesystem.\n");
1948                         if (really_read_only) {
1949                                 printk(KERN_ERR "EXT3-fs: write access "
1950                                         "unavailable, cannot proceed.\n");
1951                                 return -EROFS;
1952                         }
1953                         printk (KERN_INFO "EXT3-fs: write access will "
1954                                         "be enabled during recovery.\n");
1955                 }
1956         }
1957
1958         if (journal_inum && journal_dev) {
1959                 printk(KERN_ERR "EXT3-fs: filesystem has both journal "
1960                        "and inode journals!\n");
1961                 return -EINVAL;
1962         }
1963
1964         if (journal_inum) {
1965                 if (!(journal = ext3_get_journal(sb, journal_inum)))
1966                         return -EINVAL;
1967         } else {
1968                 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
1969                         return -EINVAL;
1970         }
1971
1972         if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
1973                 err = journal_update_format(journal);
1974                 if (err)  {
1975                         printk(KERN_ERR "EXT3-fs: error updating journal.\n");
1976                         journal_destroy(journal);
1977                         return err;
1978                 }
1979         }
1980
1981         if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
1982                 err = journal_wipe(journal, !really_read_only);
1983         if (!err)
1984                 err = journal_load(journal);
1985
1986         if (err) {
1987                 printk(KERN_ERR "EXT3-fs: error loading journal.\n");
1988                 journal_destroy(journal);
1989                 return err;
1990         }
1991
1992         EXT3_SB(sb)->s_journal = journal;
1993         ext3_clear_journal_err(sb, es);
1994
1995         if (journal_devnum &&
1996             journal_devnum != le32_to_cpu(es->s_journal_dev)) {
1997                 es->s_journal_dev = cpu_to_le32(journal_devnum);
1998                 sb->s_dirt = 1;
1999
2000                 /* Make sure we flush the recovery flag to disk. */
2001                 ext3_commit_super(sb, es, 1);
2002         }
2003
2004         return 0;
2005 }
2006
2007 static int ext3_create_journal(struct super_block * sb,
2008                                struct ext3_super_block * es,
2009                                int journal_inum)
2010 {
2011         journal_t *journal;
2012
2013         if (sb->s_flags & MS_RDONLY) {
2014                 printk(KERN_ERR "EXT3-fs: readonly filesystem when trying to "
2015                                 "create journal.\n");
2016                 return -EROFS;
2017         }
2018
2019         if (!(journal = ext3_get_journal(sb, journal_inum)))
2020                 return -EINVAL;
2021
2022         printk(KERN_INFO "EXT3-fs: creating new journal on inode %d\n",
2023                journal_inum);
2024
2025         if (journal_create(journal)) {
2026                 printk(KERN_ERR "EXT3-fs: error creating journal.\n");
2027                 journal_destroy(journal);
2028                 return -EIO;
2029         }
2030
2031         EXT3_SB(sb)->s_journal = journal;
2032
2033         ext3_update_dynamic_rev(sb);
2034         EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2035         EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2036
2037         es->s_journal_inum = cpu_to_le32(journal_inum);
2038         sb->s_dirt = 1;
2039
2040         /* Make sure we flush the recovery flag to disk. */
2041         ext3_commit_super(sb, es, 1);
2042
2043         return 0;
2044 }
2045
2046 static void ext3_commit_super (struct super_block * sb,
2047                                struct ext3_super_block * es,
2048                                int sync)
2049 {
2050         struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
2051
2052         if (!sbh)
2053                 return;
2054         es->s_wtime = cpu_to_le32(get_seconds());
2055         es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2056         es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2057         BUFFER_TRACE(sbh, "marking dirty");
2058         mark_buffer_dirty(sbh);
2059         if (sync)
2060                 sync_dirty_buffer(sbh);
2061 }
2062
2063
2064 /*
2065  * Have we just finished recovery?  If so, and if we are mounting (or
2066  * remounting) the filesystem readonly, then we will end up with a
2067  * consistent fs on disk.  Record that fact.
2068  */
2069 static void ext3_mark_recovery_complete(struct super_block * sb,
2070                                         struct ext3_super_block * es)
2071 {
2072         journal_t *journal = EXT3_SB(sb)->s_journal;
2073
2074         journal_lock_updates(journal);
2075         journal_flush(journal);
2076         if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2077             sb->s_flags & MS_RDONLY) {
2078                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2079                 sb->s_dirt = 0;
2080                 ext3_commit_super(sb, es, 1);
2081         }
2082         journal_unlock_updates(journal);
2083 }
2084
2085 /*
2086  * If we are mounting (or read-write remounting) a filesystem whose journal
2087  * has recorded an error from a previous lifetime, move that error to the
2088  * main filesystem now.
2089  */
2090 static void ext3_clear_journal_err(struct super_block * sb,
2091                                    struct ext3_super_block * es)
2092 {
2093         journal_t *journal;
2094         int j_errno;
2095         const char *errstr;
2096
2097         journal = EXT3_SB(sb)->s_journal;
2098
2099         /*
2100          * Now check for any error status which may have been recorded in the
2101          * journal by a prior ext3_error() or ext3_abort()
2102          */
2103
2104         j_errno = journal_errno(journal);
2105         if (j_errno) {
2106                 char nbuf[16];
2107
2108                 errstr = ext3_decode_error(sb, j_errno, nbuf);
2109                 ext3_warning(sb, __FUNCTION__, "Filesystem error recorded "
2110                              "from previous mount: %s", errstr);
2111                 ext3_warning(sb, __FUNCTION__, "Marking fs in need of "
2112                              "filesystem check.");
2113
2114                 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2115                 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2116                 ext3_commit_super (sb, es, 1);
2117
2118                 journal_clear_err(journal);
2119         }
2120 }
2121
2122 /*
2123  * Force the running and committing transactions to commit,
2124  * and wait on the commit.
2125  */
2126 int ext3_force_commit(struct super_block *sb)
2127 {
2128         journal_t *journal;
2129         int ret;
2130
2131         if (sb->s_flags & MS_RDONLY)
2132                 return 0;
2133
2134         journal = EXT3_SB(sb)->s_journal;
2135         sb->s_dirt = 0;
2136         ret = ext3_journal_force_commit(journal);
2137         return ret;
2138 }
2139
2140 /*
2141  * Ext3 always journals updates to the superblock itself, so we don't
2142  * have to propagate any other updates to the superblock on disk at this
2143  * point.  Just start an async writeback to get the buffers on their way
2144  * to the disk.
2145  *
2146  * This implicitly triggers the writebehind on sync().
2147  */
2148
2149 static void ext3_write_super (struct super_block * sb)
2150 {
2151         if (mutex_trylock(&sb->s_lock) != 0)
2152                 BUG();
2153         sb->s_dirt = 0;
2154 }
2155
2156 static int ext3_sync_fs(struct super_block *sb, int wait)
2157 {
2158         tid_t target;
2159
2160         sb->s_dirt = 0;
2161         if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2162                 if (wait)
2163                         log_wait_commit(EXT3_SB(sb)->s_journal, target);
2164         }
2165         return 0;
2166 }
2167
2168 /*
2169  * LVM calls this function before a (read-only) snapshot is created.  This
2170  * gives us a chance to flush the journal completely and mark the fs clean.
2171  */
2172 static void ext3_write_super_lockfs(struct super_block *sb)
2173 {
2174         sb->s_dirt = 0;
2175
2176         if (!(sb->s_flags & MS_RDONLY)) {
2177                 journal_t *journal = EXT3_SB(sb)->s_journal;
2178
2179                 /* Now we set up the journal barrier. */
2180                 journal_lock_updates(journal);
2181                 journal_flush(journal);
2182
2183                 /* Journal blocked and flushed, clear needs_recovery flag. */
2184                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2185                 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2186         }
2187 }
2188
2189 /*
2190  * Called by LVM after the snapshot is done.  We need to reset the RECOVER
2191  * flag here, even though the filesystem is not technically dirty yet.
2192  */
2193 static void ext3_unlockfs(struct super_block *sb)
2194 {
2195         if (!(sb->s_flags & MS_RDONLY)) {
2196                 lock_super(sb);
2197                 /* Reser the needs_recovery flag before the fs is unlocked. */
2198                 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2199                 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2200                 unlock_super(sb);
2201                 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2202         }
2203 }
2204
2205 static int ext3_remount (struct super_block * sb, int * flags, char * data)
2206 {
2207         struct ext3_super_block * es;
2208         struct ext3_sb_info *sbi = EXT3_SB(sb);
2209         unsigned long n_blocks_count = 0;
2210         unsigned long old_sb_flags;
2211         struct ext3_mount_options old_opts;
2212         int err;
2213 #ifdef CONFIG_QUOTA
2214         int i;
2215 #endif
2216
2217         /* Store the original options */
2218         old_sb_flags = sb->s_flags;
2219         old_opts.s_mount_opt = sbi->s_mount_opt;
2220         old_opts.s_resuid = sbi->s_resuid;
2221         old_opts.s_resgid = sbi->s_resgid;
2222         old_opts.s_commit_interval = sbi->s_commit_interval;
2223 #ifdef CONFIG_QUOTA
2224         old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2225         for (i = 0; i < MAXQUOTAS; i++)
2226                 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2227 #endif
2228
2229         /*
2230          * Allow the "check" option to be passed as a remount option.
2231          */
2232         if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2233                 err = -EINVAL;
2234                 goto restore_opts;
2235         }
2236
2237         if (sbi->s_mount_opt & EXT3_MOUNT_ABORT)
2238                 ext3_abort(sb, __FUNCTION__, "Abort forced by user");
2239
2240         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2241                 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2242
2243         es = sbi->s_es;
2244
2245         ext3_init_journal_params(sb, sbi->s_journal);
2246
2247         if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2248                 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
2249                 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT) {
2250                         err = -EROFS;
2251                         goto restore_opts;
2252                 }
2253
2254                 if (*flags & MS_RDONLY) {
2255                         /*
2256                          * First of all, the unconditional stuff we have to do
2257                          * to disable replay of the journal when we next remount
2258                          */
2259                         sb->s_flags |= MS_RDONLY;
2260
2261                         /*
2262                          * OK, test if we are remounting a valid rw partition
2263                          * readonly, and if so set the rdonly flag and then
2264                          * mark the partition as valid again.
2265                          */
2266                         if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2267                             (sbi->s_mount_state & EXT3_VALID_FS))
2268                                 es->s_state = cpu_to_le16(sbi->s_mount_state);
2269
2270                         ext3_mark_recovery_complete(sb, es);
2271                 } else {
2272                         __le32 ret;
2273                         if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2274                                         ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2275                                 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2276                                        "remount RDWR because of unsupported "
2277                                        "optional features (%x).\n",
2278                                        sb->s_id, le32_to_cpu(ret));
2279                                 err = -EROFS;
2280                                 goto restore_opts;
2281                         }
2282                         /*
2283                          * Mounting a RDONLY partition read-write, so reread
2284                          * and store the current valid flag.  (It may have
2285                          * been changed by e2fsck since we originally mounted
2286                          * the partition.)
2287                          */
2288                         ext3_clear_journal_err(sb, es);
2289                         sbi->s_mount_state = le16_to_cpu(es->s_state);
2290                         if ((ret = ext3_group_extend(sb, es, n_blocks_count))) {
2291                                 err = ret;
2292                                 goto restore_opts;
2293                         }
2294                         if (!ext3_setup_super (sb, es, 0))
2295                                 sb->s_flags &= ~MS_RDONLY;
2296                 }
2297         }
2298 #ifdef CONFIG_QUOTA
2299         /* Release old quota file names */
2300         for (i = 0; i < MAXQUOTAS; i++)
2301                 if (old_opts.s_qf_names[i] &&
2302                     old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2303                         kfree(old_opts.s_qf_names[i]);
2304 #endif
2305         return 0;
2306 restore_opts:
2307         sb->s_flags = old_sb_flags;
2308         sbi->s_mount_opt = old_opts.s_mount_opt;
2309         sbi->s_resuid = old_opts.s_resuid;
2310         sbi->s_resgid = old_opts.s_resgid;
2311         sbi->s_commit_interval = old_opts.s_commit_interval;
2312 #ifdef CONFIG_QUOTA
2313         sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2314         for (i = 0; i < MAXQUOTAS; i++) {
2315                 if (sbi->s_qf_names[i] &&
2316                     old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2317                         kfree(sbi->s_qf_names[i]);
2318                 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2319         }
2320 #endif
2321         return err;
2322 }
2323
2324 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
2325 {
2326         struct super_block *sb = dentry->d_sb;
2327         struct ext3_sb_info *sbi = EXT3_SB(sb);
2328         struct ext3_super_block *es = sbi->s_es;
2329         unsigned long overhead;
2330         int i;
2331
2332         if (test_opt (sb, MINIX_DF))
2333                 overhead = 0;
2334         else {
2335                 unsigned long ngroups;
2336                 ngroups = EXT3_SB(sb)->s_groups_count;
2337                 smp_rmb();
2338
2339                 /*
2340                  * Compute the overhead (FS structures)
2341                  */
2342
2343                 /*
2344                  * All of the blocks before first_data_block are
2345                  * overhead
2346                  */
2347                 overhead = le32_to_cpu(es->s_first_data_block);
2348
2349                 /*
2350                  * Add the overhead attributed to the superblock and
2351                  * block group descriptors.  If the sparse superblocks
2352                  * feature is turned on, then not all groups have this.
2353                  */
2354                 for (i = 0; i < ngroups; i++) {
2355                         overhead += ext3_bg_has_super(sb, i) +
2356                                 ext3_bg_num_gdb(sb, i);
2357                         cond_resched();
2358                 }
2359
2360                 /*
2361                  * Every block group has an inode bitmap, a block
2362                  * bitmap, and an inode table.
2363                  */
2364                 overhead += (ngroups * (2 + EXT3_SB(sb)->s_itb_per_group));
2365         }
2366
2367         buf->f_type = EXT3_SUPER_MAGIC;
2368         buf->f_bsize = sb->s_blocksize;
2369         buf->f_blocks = le32_to_cpu(es->s_blocks_count) - overhead;
2370         buf->f_bfree = percpu_counter_sum(&sbi->s_freeblocks_counter);
2371         buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2372         if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2373                 buf->f_bavail = 0;
2374         buf->f_files = le32_to_cpu(es->s_inodes_count);
2375         buf->f_ffree = percpu_counter_sum(&sbi->s_freeinodes_counter);
2376         buf->f_namelen = EXT3_NAME_LEN;
2377         return 0;
2378 }
2379
2380 /* Helper function for writing quotas on sync - we need to start transaction before quota file
2381  * is locked for write. Otherwise the are possible deadlocks:
2382  * Process 1                         Process 2
2383  * ext3_create()                     quota_sync()
2384  *   journal_start()                   write_dquot()
2385  *   DQUOT_INIT()                        down(dqio_mutex)
2386  *     down(dqio_mutex)                    journal_start()
2387  *
2388  */
2389
2390 #ifdef CONFIG_QUOTA
2391
2392 static inline struct inode *dquot_to_inode(struct dquot *dquot)
2393 {
2394         return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2395 }
2396
2397 static int ext3_dquot_initialize(struct inode *inode, int type)
2398 {
2399         handle_t *handle;
2400         int ret, err;
2401
2402         /* We may create quota structure so we need to reserve enough blocks */
2403         handle = ext3_journal_start(inode, 2*EXT3_QUOTA_INIT_BLOCKS(inode->i_sb));
2404         if (IS_ERR(handle))
2405                 return PTR_ERR(handle);
2406         ret = dquot_initialize(inode, type);
2407         err = ext3_journal_stop(handle);
2408         if (!ret)
2409                 ret = err;
2410         return ret;
2411 }
2412
2413 static int ext3_dquot_drop(struct inode *inode)
2414 {
2415         handle_t *handle;
2416         int ret, err;
2417
2418         /* We may delete quota structure so we need to reserve enough blocks */
2419         handle = ext3_journal_start(inode, 2*EXT3_QUOTA_DEL_BLOCKS(inode->i_sb));
2420         if (IS_ERR(handle))
2421                 return PTR_ERR(handle);
2422         ret = dquot_drop(inode);
2423         err = ext3_journal_stop(handle);
2424         if (!ret)
2425                 ret = err;
2426         return ret;
2427 }
2428
2429 static int ext3_write_dquot(struct dquot *dquot)
2430 {
2431         int ret, err;
2432         handle_t *handle;
2433         struct inode *inode;
2434
2435         inode = dquot_to_inode(dquot);
2436         handle = ext3_journal_start(inode,
2437                                         EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2438         if (IS_ERR(handle))
2439                 return PTR_ERR(handle);
2440         ret = dquot_commit(dquot);
2441         err = ext3_journal_stop(handle);
2442         if (!ret)
2443                 ret = err;
2444         return ret;
2445 }
2446
2447 static int ext3_acquire_dquot(struct dquot *dquot)
2448 {
2449         int ret, err;
2450         handle_t *handle;
2451
2452         handle = ext3_journal_start(dquot_to_inode(dquot),
2453                                         EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2454         if (IS_ERR(handle))
2455                 return PTR_ERR(handle);
2456         ret = dquot_acquire(dquot);
2457         err = ext3_journal_stop(handle);
2458         if (!ret)
2459                 ret = err;
2460         return ret;
2461 }
2462
2463 static int ext3_release_dquot(struct dquot *dquot)
2464 {
2465         int ret, err;
2466         handle_t *handle;
2467
2468         handle = ext3_journal_start(dquot_to_inode(dquot),
2469                                         EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2470         if (IS_ERR(handle))
2471                 return PTR_ERR(handle);
2472         ret = dquot_release(dquot);
2473         err = ext3_journal_stop(handle);
2474         if (!ret)
2475                 ret = err;
2476         return ret;
2477 }
2478
2479 static int ext3_mark_dquot_dirty(struct dquot *dquot)
2480 {
2481         /* Are we journalling quotas? */
2482         if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2483             EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2484                 dquot_mark_dquot_dirty(dquot);
2485                 return ext3_write_dquot(dquot);
2486         } else {
2487                 return dquot_mark_dquot_dirty(dquot);
2488         }
2489 }
2490
2491 static int ext3_write_info(struct super_block *sb, int type)
2492 {
2493         int ret, err;
2494         handle_t *handle;
2495
2496         /* Data block + inode block */
2497         handle = ext3_journal_start(sb->s_root->d_inode, 2);
2498         if (IS_ERR(handle))
2499                 return PTR_ERR(handle);
2500         ret = dquot_commit_info(sb, type);
2501         err = ext3_journal_stop(handle);
2502         if (!ret)
2503                 ret = err;
2504         return ret;
2505 }
2506
2507 /*
2508  * Turn on quotas during mount time - we need to find
2509  * the quota file and such...
2510  */
2511 static int ext3_quota_on_mount(struct super_block *sb, int type)
2512 {
2513         return vfs_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2514                         EXT3_SB(sb)->s_jquota_fmt, type);
2515 }
2516
2517 /*
2518  * Standard function to be called on quota_on
2519  */
2520 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
2521                          char *path)
2522 {
2523         int err;
2524         struct nameidata nd;
2525
2526         if (!test_opt(sb, QUOTA))
2527                 return -EINVAL;
2528         /* Not journalling quota? */
2529         if (!EXT3_SB(sb)->s_qf_names[USRQUOTA] &&
2530             !EXT3_SB(sb)->s_qf_names[GRPQUOTA])
2531                 return vfs_quota_on(sb, type, format_id, path);
2532         err = path_lookup(path, LOOKUP_FOLLOW, &nd);
2533         if (err)
2534                 return err;
2535         /* Quotafile not on the same filesystem? */
2536         if (nd.mnt->mnt_sb != sb) {
2537                 path_release(&nd);
2538                 return -EXDEV;
2539         }
2540         /* Quotafile not of fs root? */
2541         if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode)
2542                 printk(KERN_WARNING
2543                         "EXT3-fs: Quota file not on filesystem root. "
2544                         "Journalled quota will not work.\n");
2545         path_release(&nd);
2546         return vfs_quota_on(sb, type, format_id, path);
2547 }
2548
2549 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2550  * acquiring the locks... As quota files are never truncated and quota code
2551  * itself serializes the operations (and noone else should touch the files)
2552  * we don't have to be afraid of races */
2553 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2554                                size_t len, loff_t off)
2555 {
2556         struct inode *inode = sb_dqopt(sb)->files[type];
2557         sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2558         int err = 0;
2559         int offset = off & (sb->s_blocksize - 1);
2560         int tocopy;
2561         size_t toread;
2562         struct buffer_head *bh;
2563         loff_t i_size = i_size_read(inode);
2564
2565         if (off > i_size)
2566                 return 0;
2567         if (off+len > i_size)
2568                 len = i_size-off;
2569         toread = len;
2570         while (toread > 0) {
2571                 tocopy = sb->s_blocksize - offset < toread ?
2572                                 sb->s_blocksize - offset : toread;
2573                 bh = ext3_bread(NULL, inode, blk, 0, &err);
2574                 if (err)
2575                         return err;
2576                 if (!bh)        /* A hole? */
2577                         memset(data, 0, tocopy);
2578                 else
2579                         memcpy(data, bh->b_data+offset, tocopy);
2580                 brelse(bh);
2581                 offset = 0;
2582                 toread -= tocopy;
2583                 data += tocopy;
2584                 blk++;
2585         }
2586         return len;
2587 }
2588
2589 /* Write to quotafile (we know the transaction is already started and has
2590  * enough credits) */
2591 static ssize_t ext3_quota_write(struct super_block *sb, int type,
2592                                 const char *data, size_t len, loff_t off)
2593 {
2594         struct inode *inode = sb_dqopt(sb)->files[type];
2595         sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2596         int err = 0;
2597         int offset = off & (sb->s_blocksize - 1);
2598         int tocopy;
2599         int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
2600         size_t towrite = len;
2601         struct buffer_head *bh;
2602         handle_t *handle = journal_current_handle();
2603
2604         mutex_lock(&inode->i_mutex);
2605         while (towrite > 0) {
2606                 tocopy = sb->s_blocksize - offset < towrite ?
2607                                 sb->s_blocksize - offset : towrite;
2608                 bh = ext3_bread(handle, inode, blk, 1, &err);
2609                 if (!bh)
2610                         goto out;
2611                 if (journal_quota) {
2612                         err = ext3_journal_get_write_access(handle, bh);
2613                         if (err) {
2614                                 brelse(bh);
2615                                 goto out;
2616                         }
2617                 }
2618                 lock_buffer(bh);
2619                 memcpy(bh->b_data+offset, data, tocopy);
2620                 flush_dcache_page(bh->b_page);
2621                 unlock_buffer(bh);
2622                 if (journal_quota)
2623                         err = ext3_journal_dirty_metadata(handle, bh);
2624                 else {
2625                         /* Always do at least ordered writes for quotas */
2626                         err = ext3_journal_dirty_data(handle, bh);
2627                         mark_buffer_dirty(bh);
2628                 }
2629                 brelse(bh);
2630                 if (err)
2631                         goto out;
2632                 offset = 0;
2633                 towrite -= tocopy;
2634                 data += tocopy;
2635                 blk++;
2636         }
2637 out:
2638         if (len == towrite)
2639                 return err;
2640         if (inode->i_size < off+len-towrite) {
2641                 i_size_write(inode, off+len-towrite);
2642                 EXT3_I(inode)->i_disksize = inode->i_size;
2643         }
2644         inode->i_version++;
2645         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2646         ext3_mark_inode_dirty(handle, inode);
2647         mutex_unlock(&inode->i_mutex);
2648         return len - towrite;
2649 }
2650
2651 #endif
2652
2653 static int ext3_get_sb(struct file_system_type *fs_type,
2654         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
2655 {
2656         return get_sb_bdev(fs_type, flags, dev_name, data, ext3_fill_super, mnt);
2657 }
2658
2659 static struct file_system_type ext3_fs_type = {
2660         .owner          = THIS_MODULE,
2661         .name           = "ext3",
2662         .get_sb         = ext3_get_sb,
2663         .kill_sb        = kill_block_super,
2664         .fs_flags       = FS_REQUIRES_DEV,
2665 };
2666
2667 static int __init init_ext3_fs(void)
2668 {
2669         int err = init_ext3_xattr();
2670         if (err)
2671                 return err;
2672         err = init_inodecache();
2673         if (err)
2674                 goto out1;
2675         err = register_filesystem(&ext3_fs_type);
2676         if (err)
2677                 goto out;
2678         return 0;
2679 out:
2680         destroy_inodecache();
2681 out1:
2682         exit_ext3_xattr();
2683         return err;
2684 }
2685
2686 static void __exit exit_ext3_fs(void)
2687 {
2688         unregister_filesystem(&ext3_fs_type);
2689         destroy_inodecache();
2690         exit_ext3_xattr();
2691 }
2692
2693 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
2694 MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
2695 MODULE_LICENSE("GPL");
2696 module_init(init_ext3_fs)
2697 module_exit(exit_ext3_fs)