fs/ext3/super.c

   1 /*
   2  *  linux/fs/ext3/super.c
   3  *
   4  * Copyright (C) 1992, 1993, 1994, 1995
   5  * Remy Card (card@masi.ibp.fr)
   6  * Laboratoire MASI - Institut Blaise Pascal
   7  * Universite Pierre et Marie Curie (Paris VI)
   8  *
   9  *  from
  10  *
  11  *  linux/fs/minix/inode.c
  12  *
  13  *  Copyright (C) 1991, 1992  Linus Torvalds
  14  *
  15  *  Big-endian to little-endian byte-swapping/bitmaps by
  16  *        David S. Miller (davem@caip.rutgers.edu), 1995
  17  */
  18
  19 #include <linux/module.h>
  20 #include <linux/string.h>
  21 #include <linux/fs.h>
  22 #include <linux/time.h>
  23 #include <linux/jbd.h>
  24 #include <linux/ext3_fs.h>
  25 #include <linux/ext3_jbd.h>
  26 #include <linux/slab.h>
  27 #include <linux/init.h>
  28 #include <linux/blkdev.h>
  29 #include <linux/parser.h>
  30 #include <linux/buffer_head.h>
  31 #include <linux/exportfs.h>
  32 #include <linux/vfs.h>
  33 #include <linux/random.h>
  34 #include <linux/mount.h>
  35 #include <linux/namei.h>
  36 #include <linux/quotaops.h>
  37 #include <linux/seq_file.h>
  38 #include <linux/log2.h>
  39 #include <linux/cleancache.h>
  40
  41 #include <asm/uaccess.h>
  42
  43 #include "xattr.h"
  44 #include "acl.h"
  45 #include "namei.h"
  46
  47 #define CREATE_TRACE_POINTS
  48 #include <trace/events/ext3.h>
  49
  50 #ifdef CONFIG_EXT3_DEFAULTS_TO_ORDERED
  51   #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_ORDERED_DATA
  52 #else
  53   #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_WRITEBACK_DATA
  54 #endif
  55
  56 static int ext3_load_journal(struct super_block *, struct ext3_super_block *,
  57                              unsigned long journal_devnum);
  58 static int ext3_create_journal(struct super_block *, struct ext3_super_block *,
  59                                unsigned int);
  60 static int ext3_commit_super(struct super_block *sb,
  61                                struct ext3_super_block *es,
  62                                int sync);
  63 static void ext3_mark_recovery_complete(struct super_block * sb,
  64                                         struct ext3_super_block * es);
  65 static void ext3_clear_journal_err(struct super_block * sb,
  66                                    struct ext3_super_block * es);
  67 static int ext3_sync_fs(struct super_block *sb, int wait);
  68 static const char *ext3_decode_error(struct super_block * sb, int errno,
  69                                      char nbuf[16]);
  70 static int ext3_remount (struct super_block * sb, int * flags, char * data);
  71 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf);
  72 static int ext3_unfreeze(struct super_block *sb);
  73 static int ext3_freeze(struct super_block *sb);
  74
  75 /*
  76  * Wrappers for journal_start/end.
  77  *
  78  * The only special thing we need to do here is to make sure that all
  79  * journal_end calls result in the superblock being marked dirty, so
  80  * that sync() will call the filesystem's write_super callback if
  81  * appropriate.
  82  */
  83 handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks)
  84 {
  85         journal_t *journal;
  86
  87         if (sb->s_flags & MS_RDONLY)
  88                 return ERR_PTR(-EROFS);
  89
  90         /* Special case here: if the journal has aborted behind our
  91          * backs (eg. EIO in the commit thread), then we still need to
  92          * take the FS itself readonly cleanly. */
  93         journal = EXT3_SB(sb)->s_journal;
  94         if (is_journal_aborted(journal)) {
  95                 ext3_abort(sb, __func__,
  96                            "Detected aborted journal");
  97                 return ERR_PTR(-EROFS);
  98         }
  99
 100         return journal_start(journal, nblocks);
 101 }
 102
 103 /*
 104  * The only special thing we need to do here is to make sure that all
 105  * journal_stop calls result in the superblock being marked dirty, so
 106  * that sync() will call the filesystem's write_super callback if
 107  * appropriate.
 108  */
 109 int __ext3_journal_stop(const char *where, handle_t *handle)
 110 {
 111         struct super_block *sb;
 112         int err;
 113         int rc;
 114
 115         sb = handle->h_transaction->t_journal->j_private;
 116         err = handle->h_err;
 117         rc = journal_stop(handle);
 118
 119         if (!err)
 120                 err = rc;
 121         if (err)
 122                 __ext3_std_error(sb, where, err);
 123         return err;
 124 }
 125
 126 void ext3_journal_abort_handle(const char *caller, const char *err_fn,
 127                 struct buffer_head *bh, handle_t *handle, int err)
 128 {
 129         char nbuf[16];
 130         const char *errstr = ext3_decode_error(NULL, err, nbuf);
 131
 132         if (bh)
 133                 BUFFER_TRACE(bh, "abort");
 134
 135         if (!handle->h_err)
 136                 handle->h_err = err;
 137
 138         if (is_handle_aborted(handle))
 139                 return;
 140
 141         printk(KERN_ERR "EXT3-fs: %s: aborting transaction: %s in %s\n",
 142                 caller, errstr, err_fn);
 143
 144         journal_abort_handle(handle);
 145 }
 146
 147 void ext3_msg(struct super_block *sb, const char *prefix,
 148                 const char *fmt, ...)
 149 {
 150         struct va_format vaf;
 151         va_list args;
 152
 153         va_start(args, fmt);
 154
 155         vaf.fmt = fmt;
 156         vaf.va = &args;
 157
 158         printk("%sEXT3-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
 159
 160         va_end(args);
 161 }
 162
 163 /* Deal with the reporting of failure conditions on a filesystem such as
 164  * inconsistencies detected or read IO failures.
 165  *
 166  * On ext2, we can store the error state of the filesystem in the
 167  * superblock.  That is not possible on ext3, because we may have other
 168  * write ordering constraints on the superblock which prevent us from
 169  * writing it out straight away; and given that the journal is about to
 170  * be aborted, we can't rely on the current, or future, transactions to
 171  * write out the superblock safely.
 172  *
 173  * We'll just use the journal_abort() error code to record an error in
 174  * the journal instead.  On recovery, the journal will complain about
 175  * that error until we've noted it down and cleared it.
 176  */
 177
 178 static void ext3_handle_error(struct super_block *sb)
 179 {
 180         struct ext3_super_block *es = EXT3_SB(sb)->s_es;
 181
 182         EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
 183         es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
 184
 185         if (sb->s_flags & MS_RDONLY)
 186                 return;
 187
 188         if (!test_opt (sb, ERRORS_CONT)) {
 189                 journal_t *journal = EXT3_SB(sb)->s_journal;
 190
 191                 set_opt(EXT3_SB(sb)->s_mount_opt, ABORT);
 192                 if (journal)
 193                         journal_abort(journal, -EIO);
 194         }
 195         if (test_opt (sb, ERRORS_RO)) {
 196                 ext3_msg(sb, KERN_CRIT,
 197                         "error: remounting filesystem read-only");
 198                 sb->s_flags |= MS_RDONLY;
 199         }
 200         ext3_commit_super(sb, es, 1);
 201         if (test_opt(sb, ERRORS_PANIC))
 202                 panic("EXT3-fs (%s): panic forced after error\n",
 203                         sb->s_id);
 204 }
 205
 206 void ext3_error(struct super_block *sb, const char *function,
 207                 const char *fmt, ...)
 208 {
 209         struct va_format vaf;
 210         va_list args;
 211
 212         va_start(args, fmt);
 213
 214         vaf.fmt = fmt;
 215         vaf.va = &args;
 216
 217         printk(KERN_CRIT "EXT3-fs error (device %s): %s: %pV\n",
 218                sb->s_id, function, &vaf);
 219
 220         va_end(args);
 221
 222         ext3_handle_error(sb);
 223 }
 224
 225 static const char *ext3_decode_error(struct super_block * sb, int errno,
 226                                      char nbuf[16])
 227 {
 228         char *errstr = NULL;
 229
 230         switch (errno) {
 231         case -EIO:
 232                 errstr = "IO failure";
 233                 break;
 234         case -ENOMEM:
 235                 errstr = "Out of memory";
 236                 break;
 237         case -EROFS:
 238                 if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT)
 239                         errstr = "Journal has aborted";
 240                 else
 241                         errstr = "Readonly filesystem";
 242                 break;
 243         default:
 244                 /* If the caller passed in an extra buffer for unknown
 245                  * errors, textualise them now.  Else we just return
 246                  * NULL. */
 247                 if (nbuf) {
 248                         /* Check for truncated error codes... */
 249                         if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
 250                                 errstr = nbuf;
 251                 }
 252                 break;
 253         }
 254
 255         return errstr;
 256 }
 257
 258 /* __ext3_std_error decodes expected errors from journaling functions
 259  * automatically and invokes the appropriate error response.  */
 260
 261 void __ext3_std_error (struct super_block * sb, const char * function,
 262                        int errno)
 263 {
 264         char nbuf[16];
 265         const char *errstr;
 266
 267         /* Special case: if the error is EROFS, and we're not already
 268          * inside a transaction, then there's really no point in logging
 269          * an error. */
 270         if (errno == -EROFS && journal_current_handle() == NULL &&
 271             (sb->s_flags & MS_RDONLY))
 272                 return;
 273
 274         errstr = ext3_decode_error(sb, errno, nbuf);
 275         ext3_msg(sb, KERN_CRIT, "error in %s: %s", function, errstr);
 276
 277         ext3_handle_error(sb);
 278 }
 279
 280 /*
 281  * ext3_abort is a much stronger failure handler than ext3_error.  The
 282  * abort function may be used to deal with unrecoverable failures such
 283  * as journal IO errors or ENOMEM at a critical moment in log management.
 284  *
 285  * We unconditionally force the filesystem into an ABORT|READONLY state,
 286  * unless the error response on the fs has been set to panic in which
 287  * case we take the easy way out and panic immediately.
 288  */
 289
 290 void ext3_abort(struct super_block *sb, const char *function,
 291                  const char *fmt, ...)
 292 {
 293         struct va_format vaf;
 294         va_list args;
 295
 296         va_start(args, fmt);
 297
 298         vaf.fmt = fmt;
 299         vaf.va = &args;
 300
 301         printk(KERN_CRIT "EXT3-fs (%s): error: %s: %pV\n",
 302                sb->s_id, function, &vaf);
 303
 304         va_end(args);
 305
 306         if (test_opt(sb, ERRORS_PANIC))
 307                 panic("EXT3-fs: panic from previous error\n");
 308
 309         if (sb->s_flags & MS_RDONLY)
 310                 return;
 311
 312         ext3_msg(sb, KERN_CRIT,
 313                 "error: remounting filesystem read-only");
 314         EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
 315         sb->s_flags |= MS_RDONLY;
 316         set_opt(EXT3_SB(sb)->s_mount_opt, ABORT);
 317         if (EXT3_SB(sb)->s_journal)
 318                 journal_abort(EXT3_SB(sb)->s_journal, -EIO);
 319 }
 320
 321 void ext3_warning(struct super_block *sb, const char *function,
 322                   const char *fmt, ...)
 323 {
 324         struct va_format vaf;
 325         va_list args;
 326
 327         va_start(args, fmt);
 328
 329         vaf.fmt = fmt;
 330         vaf.va = &args;
 331
 332         printk(KERN_WARNING "EXT3-fs (%s): warning: %s: %pV\n",
 333                sb->s_id, function, &vaf);
 334
 335         va_end(args);
 336 }
 337
 338 void ext3_update_dynamic_rev(struct super_block *sb)
 339 {
 340         struct ext3_super_block *es = EXT3_SB(sb)->s_es;
 341
 342         if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
 343                 return;
 344
 345         ext3_msg(sb, KERN_WARNING,
 346                 "warning: updating to rev %d because of "
 347                 "new feature flag, running e2fsck is recommended",
 348                 EXT3_DYNAMIC_REV);
 349
 350         es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO);
 351         es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE);
 352         es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV);
 353         /* leave es->s_feature_*compat flags alone */
 354         /* es->s_uuid will be set by e2fsck if empty */
 355
 356         /*
 357          * The rest of the superblock fields should be zero, and if not it
 358          * means they are likely already in use, so leave them alone.  We
 359          * can leave it up to e2fsck to clean up any inconsistencies there.
 360          */
 361 }
 362
 363 /*
 364  * Open the external journal device
 365  */
 366 static struct block_device *ext3_blkdev_get(dev_t dev, struct super_block *sb)
 367 {
 368         struct block_device *bdev;
 369         char b[BDEVNAME_SIZE];
 370
 371         bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
 372         if (IS_ERR(bdev))
 373                 goto fail;
 374         return bdev;
 375
 376 fail:
 377         ext3_msg(sb, "error: failed to open journal device %s: %ld",
 378                 __bdevname(dev, b), PTR_ERR(bdev));
 379
 380         return NULL;
 381 }
 382
 383 /*
 384  * Release the journal device
 385  */
 386 static int ext3_blkdev_put(struct block_device *bdev)
 387 {
 388         return blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
 389 }
 390
 391 static int ext3_blkdev_remove(struct ext3_sb_info *sbi)
 392 {
 393         struct block_device *bdev;
 394         int ret = -ENODEV;
 395
 396         bdev = sbi->journal_bdev;
 397         if (bdev) {
 398                 ret = ext3_blkdev_put(bdev);
 399                 sbi->journal_bdev = NULL;
 400         }
 401         return ret;
 402 }
 403
 404 static inline struct inode *orphan_list_entry(struct list_head *l)
 405 {
 406         return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
 407 }
 408
 409 static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
 410 {
 411         struct list_head *l;
 412
 413         ext3_msg(sb, KERN_ERR, "error: sb orphan head is %d",
 414                le32_to_cpu(sbi->s_es->s_last_orphan));
 415
 416         ext3_msg(sb, KERN_ERR, "sb_info orphan list:");
 417         list_for_each(l, &sbi->s_orphan) {
 418                 struct inode *inode = orphan_list_entry(l);
 419                 ext3_msg(sb, KERN_ERR, "  "
 420                        "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
 421                        inode->i_sb->s_id, inode->i_ino, inode,
 422                        inode->i_mode, inode->i_nlink,
 423                        NEXT_ORPHAN(inode));
 424         }
 425 }
 426
 427 static void ext3_put_super (struct super_block * sb)
 428 {
 429         struct ext3_sb_info *sbi = EXT3_SB(sb);
 430         struct ext3_super_block *es = sbi->s_es;
 431         int i, err;
 432
 433         dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
 434         ext3_xattr_put_super(sb);
 435         err = journal_destroy(sbi->s_journal);
 436         sbi->s_journal = NULL;
 437         if (err < 0)
 438                 ext3_abort(sb, __func__, "Couldn't clean up the journal");
 439
 440         if (!(sb->s_flags & MS_RDONLY)) {
 441                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
 442                 es->s_state = cpu_to_le16(sbi->s_mount_state);
 443                 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
 444                 mark_buffer_dirty(sbi->s_sbh);
 445                 ext3_commit_super(sb, es, 1);
 446         }
 447
 448         for (i = 0; i < sbi->s_gdb_count; i++)
 449                 brelse(sbi->s_group_desc[i]);
 450         kfree(sbi->s_group_desc);
 451         percpu_counter_destroy(&sbi->s_freeblocks_counter);
 452         percpu_counter_destroy(&sbi->s_freeinodes_counter);
 453         percpu_counter_destroy(&sbi->s_dirs_counter);
 454         brelse(sbi->s_sbh);
 455 #ifdef CONFIG_QUOTA
 456         for (i = 0; i < MAXQUOTAS; i++)
 457                 kfree(sbi->s_qf_names[i]);
 458 #endif
 459
 460         /* Debugging code just in case the in-memory inode orphan list
 461          * isn't empty.  The on-disk one can be non-empty if we've
 462          * detected an error and taken the fs readonly, but the
 463          * in-memory list had better be clean by this point. */
 464         if (!list_empty(&sbi->s_orphan))
 465                 dump_orphan_list(sb, sbi);
 466         J_ASSERT(list_empty(&sbi->s_orphan));
 467
 468         invalidate_bdev(sb->s_bdev);
 469         if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
 470                 /*
 471                  * Invalidate the journal device's buffers.  We don't want them
 472                  * floating about in memory - the physical journal device may
 473                  * hotswapped, and it breaks the `ro-after' testing code.
 474                  */
 475                 sync_blockdev(sbi->journal_bdev);
 476                 invalidate_bdev(sbi->journal_bdev);
 477                 ext3_blkdev_remove(sbi);
 478         }
 479         sb->s_fs_info = NULL;
 480         kfree(sbi->s_blockgroup_lock);
 481         kfree(sbi);
 482 }
 483
 484 static struct kmem_cache *ext3_inode_cachep;
 485
 486 /*
 487  * Called inside transaction, so use GFP_NOFS
 488  */
 489 static struct inode *ext3_alloc_inode(struct super_block *sb)
 490 {
 491         struct ext3_inode_info *ei;
 492
 493         ei = kmem_cache_alloc(ext3_inode_cachep, GFP_NOFS);
 494         if (!ei)
 495                 return NULL;
 496         ei->i_block_alloc_info = NULL;
 497         ei->vfs_inode.i_version = 1;
 498         atomic_set(&ei->i_datasync_tid, 0);
 499         atomic_set(&ei->i_sync_tid, 0);
 500         return &ei->vfs_inode;
 501 }
 502
 503 static int ext3_drop_inode(struct inode *inode)
 504 {
 505         int drop = generic_drop_inode(inode);
 506
 507         trace_ext3_drop_inode(inode, drop);
 508         return drop;
 509 }
 510
 511 static void ext3_i_callback(struct rcu_head *head)
 512 {
 513         struct inode *inode = container_of(head, struct inode, i_rcu);
 514         kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
 515 }
 516
 517 static void ext3_destroy_inode(struct inode *inode)
 518 {
 519         if (!list_empty(&(EXT3_I(inode)->i_orphan))) {
 520                 printk("EXT3 Inode %p: orphan list check failed!\n",
 521                         EXT3_I(inode));
 522                 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
 523                                 EXT3_I(inode), sizeof(struct ext3_inode_info),
 524                                 false);
 525                 dump_stack();
 526         }
 527         call_rcu(&inode->i_rcu, ext3_i_callback);
 528 }
 529
 530 static void init_once(void *foo)
 531 {
 532         struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
 533
 534         INIT_LIST_HEAD(&ei->i_orphan);
 535 #ifdef CONFIG_EXT3_FS_XATTR
 536         init_rwsem(&ei->xattr_sem);
 537 #endif
 538         mutex_init(&ei->truncate_mutex);
 539         inode_init_once(&ei->vfs_inode);
 540 }
 541
 542 static int init_inodecache(void)
 543 {
 544         ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
 545                                              sizeof(struct ext3_inode_info),
 546                                              0, (SLAB_RECLAIM_ACCOUNT|
 547                                                 SLAB_MEM_SPREAD),
 548                                              init_once);
 549         if (ext3_inode_cachep == NULL)
 550                 return -ENOMEM;
 551         return 0;
 552 }
 553
 554 static void destroy_inodecache(void)
 555 {
 556         kmem_cache_destroy(ext3_inode_cachep);
 557 }
 558
 559 static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
 560 {
 561 #if defined(CONFIG_QUOTA)
 562         struct ext3_sb_info *sbi = EXT3_SB(sb);
 563
 564         if (sbi->s_jquota_fmt) {
 565                 char *fmtname = "";
 566
 567                 switch (sbi->s_jquota_fmt) {
 568                 case QFMT_VFS_OLD:
 569                         fmtname = "vfsold";
 570                         break;
 571                 case QFMT_VFS_V0:
 572                         fmtname = "vfsv0";
 573                         break;
 574                 case QFMT_VFS_V1:
 575                         fmtname = "vfsv1";
 576                         break;
 577                 }
 578                 seq_printf(seq, ",jqfmt=%s", fmtname);
 579         }
 580
 581         if (sbi->s_qf_names[USRQUOTA])
 582                 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
 583
 584         if (sbi->s_qf_names[GRPQUOTA])
 585                 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
 586
 587         if (test_opt(sb, USRQUOTA))
 588                 seq_puts(seq, ",usrquota");
 589
 590         if (test_opt(sb, GRPQUOTA))
 591                 seq_puts(seq, ",grpquota");
 592 #endif
 593 }
 594
 595 static char *data_mode_string(unsigned long mode)
 596 {
 597         switch (mode) {
 598         case EXT3_MOUNT_JOURNAL_DATA:
 599                 return "journal";
 600         case EXT3_MOUNT_ORDERED_DATA:
 601                 return "ordered";
 602         case EXT3_MOUNT_WRITEBACK_DATA:
 603                 return "writeback";
 604         }
 605         return "unknown";
 606 }
 607
 608 /*
 609  * Show an option if
 610  *  - it's set to a non-default value OR
 611  *  - if the per-sb default is different from the global default
 612  */
 613 static int ext3_show_options(struct seq_file *seq, struct vfsmount *vfs)
 614 {
 615         struct super_block *sb = vfs->mnt_sb;
 616         struct ext3_sb_info *sbi = EXT3_SB(sb);
 617         struct ext3_super_block *es = sbi->s_es;
 618         unsigned long def_mount_opts;
 619
 620         def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
 621
 622         if (sbi->s_sb_block != 1)
 623                 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
 624         if (test_opt(sb, MINIX_DF))
 625                 seq_puts(seq, ",minixdf");
 626         if (test_opt(sb, GRPID))
 627                 seq_puts(seq, ",grpid");
 628         if (!test_opt(sb, GRPID) && (def_mount_opts & EXT3_DEFM_BSDGROUPS))
 629                 seq_puts(seq, ",nogrpid");
 630         if (sbi->s_resuid != EXT3_DEF_RESUID ||
 631             le16_to_cpu(es->s_def_resuid) != EXT3_DEF_RESUID) {
 632                 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
 633         }
 634         if (sbi->s_resgid != EXT3_DEF_RESGID ||
 635             le16_to_cpu(es->s_def_resgid) != EXT3_DEF_RESGID) {
 636                 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
 637         }
 638         if (test_opt(sb, ERRORS_RO)) {
 639                 int def_errors = le16_to_cpu(es->s_errors);
 640
 641                 if (def_errors == EXT3_ERRORS_PANIC ||
 642                     def_errors == EXT3_ERRORS_CONTINUE) {
 643                         seq_puts(seq, ",errors=remount-ro");
 644                 }
 645         }
 646         if (test_opt(sb, ERRORS_CONT))
 647                 seq_puts(seq, ",errors=continue");
 648         if (test_opt(sb, ERRORS_PANIC))
 649                 seq_puts(seq, ",errors=panic");
 650         if (test_opt(sb, NO_UID32))
 651                 seq_puts(seq, ",nouid32");
 652         if (test_opt(sb, DEBUG))
 653                 seq_puts(seq, ",debug");
 654 #ifdef CONFIG_EXT3_FS_XATTR
 655         if (test_opt(sb, XATTR_USER))
 656                 seq_puts(seq, ",user_xattr");
 657         if (!test_opt(sb, XATTR_USER) &&
 658             (def_mount_opts & EXT3_DEFM_XATTR_USER)) {
 659                 seq_puts(seq, ",nouser_xattr");
 660         }
 661 #endif
 662 #ifdef CONFIG_EXT3_FS_POSIX_ACL
 663         if (test_opt(sb, POSIX_ACL))
 664                 seq_puts(seq, ",acl");
 665         if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT3_DEFM_ACL))
 666                 seq_puts(seq, ",noacl");
 667 #endif
 668         if (!test_opt(sb, RESERVATION))
 669                 seq_puts(seq, ",noreservation");
 670         if (sbi->s_commit_interval) {
 671                 seq_printf(seq, ",commit=%u",
 672                            (unsigned) (sbi->s_commit_interval / HZ));
 673         }
 674
 675         /*
 676          * Always display barrier state so it's clear what the status is.
 677          */
 678         seq_puts(seq, ",barrier=");
 679         seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
 680         seq_printf(seq, ",data=%s", data_mode_string(test_opt(sb, DATA_FLAGS)));
 681         if (test_opt(sb, DATA_ERR_ABORT))
 682                 seq_puts(seq, ",data_err=abort");
 683
 684         if (test_opt(sb, NOLOAD))
 685                 seq_puts(seq, ",norecovery");
 686
 687         ext3_show_quota_options(seq, sb);
 688
 689         return 0;
 690 }
 691
 692
 693 static struct inode *ext3_nfs_get_inode(struct super_block *sb,
 694                 u64 ino, u32 generation)
 695 {
 696         struct inode *inode;
 697
 698         if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO)
 699                 return ERR_PTR(-ESTALE);
 700         if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count))
 701                 return ERR_PTR(-ESTALE);
 702
 703         /* iget isn't really right if the inode is currently unallocated!!
 704          *
 705          * ext3_read_inode will return a bad_inode if the inode had been
 706          * deleted, so we should be safe.
 707          *
 708          * Currently we don't know the generation for parent directory, so
 709          * a generation of 0 means "accept any"
 710          */
 711         inode = ext3_iget(sb, ino);
 712         if (IS_ERR(inode))
 713                 return ERR_CAST(inode);
 714         if (generation && inode->i_generation != generation) {
 715                 iput(inode);
 716                 return ERR_PTR(-ESTALE);
 717         }
 718
 719         return inode;
 720 }
 721
 722 static struct dentry *ext3_fh_to_dentry(struct super_block *sb, struct fid *fid,
 723                 int fh_len, int fh_type)
 724 {
 725         return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
 726                                     ext3_nfs_get_inode);
 727 }
 728
 729 static struct dentry *ext3_fh_to_parent(struct super_block *sb, struct fid *fid,
 730                 int fh_len, int fh_type)
 731 {
 732         return generic_fh_to_parent(sb, fid, fh_len, fh_type,
 733                                     ext3_nfs_get_inode);
 734 }
 735
 736 /*
 737  * Try to release metadata pages (indirect blocks, directories) which are
 738  * mapped via the block device.  Since these pages could have journal heads
 739  * which would prevent try_to_free_buffers() from freeing them, we must use
 740  * jbd layer's try_to_free_buffers() function to release them.
 741  */
 742 static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
 743                                  gfp_t wait)
 744 {
 745         journal_t *journal = EXT3_SB(sb)->s_journal;
 746
 747         WARN_ON(PageChecked(page));
 748         if (!page_has_buffers(page))
 749                 return 0;
 750         if (journal)
 751                 return journal_try_to_free_buffers(journal, page,
 752                                                    wait & ~__GFP_WAIT);
 753         return try_to_free_buffers(page);
 754 }
 755
 756 #ifdef CONFIG_QUOTA
 757 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
 758 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
 759
 760 static int ext3_write_dquot(struct dquot *dquot);
 761 static int ext3_acquire_dquot(struct dquot *dquot);
 762 static int ext3_release_dquot(struct dquot *dquot);
 763 static int ext3_mark_dquot_dirty(struct dquot *dquot);
 764 static int ext3_write_info(struct super_block *sb, int type);
 765 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
 766                          struct path *path);
 767 static int ext3_quota_on_mount(struct super_block *sb, int type);
 768 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
 769                                size_t len, loff_t off);
 770 static ssize_t ext3_quota_write(struct super_block *sb, int type,
 771                                 const char *data, size_t len, loff_t off);
 772
 773 static const struct dquot_operations ext3_quota_operations = {
 774         .write_dquot    = ext3_write_dquot,
 775         .acquire_dquot  = ext3_acquire_dquot,
 776         .release_dquot  = ext3_release_dquot,
 777         .mark_dirty     = ext3_mark_dquot_dirty,
 778         .write_info     = ext3_write_info,
 779         .alloc_dquot    = dquot_alloc,
 780         .destroy_dquot  = dquot_destroy,
 781 };
 782
 783 static const struct quotactl_ops ext3_qctl_operations = {
 784         .quota_on       = ext3_quota_on,
 785         .quota_off      = dquot_quota_off,
 786         .quota_sync     = dquot_quota_sync,
 787         .get_info       = dquot_get_dqinfo,
 788         .set_info       = dquot_set_dqinfo,
 789         .get_dqblk      = dquot_get_dqblk,
 790         .set_dqblk      = dquot_set_dqblk
 791 };
 792 #endif
 793
 794 static const struct super_operations ext3_sops = {
 795         .alloc_inode    = ext3_alloc_inode,
 796         .destroy_inode  = ext3_destroy_inode,
 797         .write_inode    = ext3_write_inode,
 798         .dirty_inode    = ext3_dirty_inode,
 799         .drop_inode     = ext3_drop_inode,
 800         .evict_inode    = ext3_evict_inode,
 801         .put_super      = ext3_put_super,
 802         .sync_fs        = ext3_sync_fs,
 803         .freeze_fs      = ext3_freeze,
 804         .unfreeze_fs    = ext3_unfreeze,
 805         .statfs         = ext3_statfs,
 806         .remount_fs     = ext3_remount,
 807         .show_options   = ext3_show_options,
 808 #ifdef CONFIG_QUOTA
 809         .quota_read     = ext3_quota_read,
 810         .quota_write    = ext3_quota_write,
 811 #endif
 812         .bdev_try_to_free_page = bdev_try_to_free_page,
 813 };
 814
 815 static const struct export_operations ext3_export_ops = {
 816         .fh_to_dentry = ext3_fh_to_dentry,
 817         .fh_to_parent = ext3_fh_to_parent,
 818         .get_parent = ext3_get_parent,
 819 };
 820
 821 enum {
 822         Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
 823         Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
 824         Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
 825         Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
 826         Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
 827         Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
 828         Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
 829         Opt_data_err_abort, Opt_data_err_ignore,
 830         Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
 831         Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
 832         Opt_noquota, Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err,
 833         Opt_resize, Opt_usrquota, Opt_grpquota
 834 };
 835
 836 static const match_table_t tokens = {
 837         {Opt_bsd_df, "bsddf"},
 838         {Opt_minix_df, "minixdf"},
 839         {Opt_grpid, "grpid"},
 840         {Opt_grpid, "bsdgroups"},
 841         {Opt_nogrpid, "nogrpid"},
 842         {Opt_nogrpid, "sysvgroups"},
 843         {Opt_resgid, "resgid=%u"},
 844         {Opt_resuid, "resuid=%u"},
 845         {Opt_sb, "sb=%u"},
 846         {Opt_err_cont, "errors=continue"},
 847         {Opt_err_panic, "errors=panic"},
 848         {Opt_err_ro, "errors=remount-ro"},
 849         {Opt_nouid32, "nouid32"},
 850         {Opt_nocheck, "nocheck"},
 851         {Opt_nocheck, "check=none"},
 852         {Opt_debug, "debug"},
 853         {Opt_oldalloc, "oldalloc"},
 854         {Opt_orlov, "orlov"},
 855         {Opt_user_xattr, "user_xattr"},
 856         {Opt_nouser_xattr, "nouser_xattr"},
 857         {Opt_acl, "acl"},
 858         {Opt_noacl, "noacl"},
 859         {Opt_reservation, "reservation"},
 860         {Opt_noreservation, "noreservation"},
 861         {Opt_noload, "noload"},
 862         {Opt_noload, "norecovery"},
 863         {Opt_nobh, "nobh"},
 864         {Opt_bh, "bh"},
 865         {Opt_commit, "commit=%u"},
 866         {Opt_journal_update, "journal=update"},
 867         {Opt_journal_inum, "journal=%u"},
 868         {Opt_journal_dev, "journal_dev=%u"},
 869         {Opt_abort, "abort"},
 870         {Opt_data_journal, "data=journal"},
 871         {Opt_data_ordered, "data=ordered"},
 872         {Opt_data_writeback, "data=writeback"},
 873         {Opt_data_err_abort, "data_err=abort"},
 874         {Opt_data_err_ignore, "data_err=ignore"},
 875         {Opt_offusrjquota, "usrjquota="},
 876         {Opt_usrjquota, "usrjquota=%s"},
 877         {Opt_offgrpjquota, "grpjquota="},
 878         {Opt_grpjquota, "grpjquota=%s"},
 879         {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
 880         {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
 881         {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
 882         {Opt_grpquota, "grpquota"},
 883         {Opt_noquota, "noquota"},
 884         {Opt_quota, "quota"},
 885         {Opt_usrquota, "usrquota"},
 886         {Opt_barrier, "barrier=%u"},
 887         {Opt_barrier, "barrier"},
 888         {Opt_nobarrier, "nobarrier"},
 889         {Opt_resize, "resize"},
 890         {Opt_err, NULL},
 891 };
 892
 893 static ext3_fsblk_t get_sb_block(void **data, struct super_block *sb)
 894 {
 895         ext3_fsblk_t    sb_block;
 896         char            *options = (char *) *data;
 897
 898         if (!options || strncmp(options, "sb=", 3) != 0)
 899                 return 1;       /* Default location */
 900         options += 3;
 901         /*todo: use simple_strtoll with >32bit ext3 */
 902         sb_block = simple_strtoul(options, &options, 0);
 903         if (*options && *options != ',') {
 904                 ext3_msg(sb, "error: invalid sb specification: %s",
 905                        (char *) *data);
 906                 return 1;
 907         }
 908         if (*options == ',')
 909                 options++;
 910         *data = (void *) options;
 911         return sb_block;
 912 }
 913
 914 #ifdef CONFIG_QUOTA
 915 static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
 916 {
 917         struct ext3_sb_info *sbi = EXT3_SB(sb);
 918         char *qname;
 919
 920         if (sb_any_quota_loaded(sb) &&
 921                 !sbi->s_qf_names[qtype]) {
 922                 ext3_msg(sb, KERN_ERR,
 923                         "Cannot change journaled "
 924                         "quota options when quota turned on");
 925                 return 0;
 926         }
 927         qname = match_strdup(args);
 928         if (!qname) {
 929                 ext3_msg(sb, KERN_ERR,
 930                         "Not enough memory for storing quotafile name");
 931                 return 0;
 932         }
 933         if (sbi->s_qf_names[qtype] &&
 934                 strcmp(sbi->s_qf_names[qtype], qname)) {
 935                 ext3_msg(sb, KERN_ERR,
 936                         "%s quota file already specified", QTYPE2NAME(qtype));
 937                 kfree(qname);
 938                 return 0;
 939         }
 940         sbi->s_qf_names[qtype] = qname;
 941         if (strchr(sbi->s_qf_names[qtype], '/')) {
 942                 ext3_msg(sb, KERN_ERR,
 943                         "quotafile must be on filesystem root");
 944                 kfree(sbi->s_qf_names[qtype]);
 945                 sbi->s_qf_names[qtype] = NULL;
 946                 return 0;
 947         }
 948         set_opt(sbi->s_mount_opt, QUOTA);
 949         return 1;
 950 }
 951
 952 static int clear_qf_name(struct super_block *sb, int qtype) {
 953
 954         struct ext3_sb_info *sbi = EXT3_SB(sb);
 955
 956         if (sb_any_quota_loaded(sb) &&
 957                 sbi->s_qf_names[qtype]) {
 958                 ext3_msg(sb, KERN_ERR, "Cannot change journaled quota options"
 959                         " when quota turned on");
 960                 return 0;
 961         }
 962         /*
 963          * The space will be released later when all options are confirmed
 964          * to be correct
 965          */
 966         sbi->s_qf_names[qtype] = NULL;
 967         return 1;
 968 }
 969 #endif
 970
 971 static int parse_options (char *options, struct super_block *sb,
 972                           unsigned int *inum, unsigned long *journal_devnum,
 973                           ext3_fsblk_t *n_blocks_count, int is_remount)
 974 {
 975         struct ext3_sb_info *sbi = EXT3_SB(sb);
 976         char * p;
 977         substring_t args[MAX_OPT_ARGS];
 978         int data_opt = 0;
 979         int option;
 980 #ifdef CONFIG_QUOTA
 981         int qfmt;
 982 #endif
 983
 984         if (!options)
 985                 return 1;
 986
 987         while ((p = strsep (&options, ",")) != NULL) {
 988                 int token;
 989                 if (!*p)
 990                         continue;
 991                 /*
 992                  * Initialize args struct so we know whether arg was
 993                  * found; some options take optional arguments.
 994                  */
 995                 args[0].to = args[0].from = 0;
 996                 token = match_token(p, tokens, args);
 997                 switch (token) {
 998                 case Opt_bsd_df:
 999                         clear_opt (sbi->s_mount_opt, MINIX_DF);
1000                         break;
1001                 case Opt_minix_df:
1002                         set_opt (sbi->s_mount_opt, MINIX_DF);
1003                         break;
1004                 case Opt_grpid:
1005                         set_opt (sbi->s_mount_opt, GRPID);
1006                         break;
1007                 case Opt_nogrpid:
1008                         clear_opt (sbi->s_mount_opt, GRPID);
1009                         break;
1010                 case Opt_resuid:
1011                         if (match_int(&args[0], &option))
1012                                 return 0;
1013                         sbi->s_resuid = option;
1014                         break;
1015                 case Opt_resgid:
1016                         if (match_int(&args[0], &option))
1017                                 return 0;
1018                         sbi->s_resgid = option;
1019                         break;
1020                 case Opt_sb:
1021                         /* handled by get_sb_block() instead of here */
1022                         /* *sb_block = match_int(&args[0]); */
1023                         break;
1024                 case Opt_err_panic:
1025                         clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1026                         clear_opt (sbi->s_mount_opt, ERRORS_RO);
1027                         set_opt (sbi->s_mount_opt, ERRORS_PANIC);
1028                         break;
1029                 case Opt_err_ro:
1030                         clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1031                         clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1032                         set_opt (sbi->s_mount_opt, ERRORS_RO);
1033                         break;
1034                 case Opt_err_cont:
1035                         clear_opt (sbi->s_mount_opt, ERRORS_RO);
1036                         clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1037                         set_opt (sbi->s_mount_opt, ERRORS_CONT);
1038                         break;
1039                 case Opt_nouid32:
1040                         set_opt (sbi->s_mount_opt, NO_UID32);
1041                         break;
1042                 case Opt_nocheck:
1043                         clear_opt (sbi->s_mount_opt, CHECK);
1044                         break;
1045                 case Opt_debug:
1046                         set_opt (sbi->s_mount_opt, DEBUG);
1047                         break;
1048                 case Opt_oldalloc:
1049                         ext3_msg(sb, KERN_WARNING,
1050                                 "Ignoring deprecated oldalloc option");
1051                         break;
1052                 case Opt_orlov:
1053                         ext3_msg(sb, KERN_WARNING,
1054                                 "Ignoring deprecated orlov option");
1055                         break;
1056 #ifdef CONFIG_EXT3_FS_XATTR
1057                 case Opt_user_xattr:
1058                         set_opt (sbi->s_mount_opt, XATTR_USER);
1059                         break;
1060                 case Opt_nouser_xattr:
1061                         clear_opt (sbi->s_mount_opt, XATTR_USER);
1062                         break;
1063 #else
1064                 case Opt_user_xattr:
1065                 case Opt_nouser_xattr:
1066                         ext3_msg(sb, KERN_INFO,
1067                                 "(no)user_xattr options not supported");
1068                         break;
1069 #endif
1070 #ifdef CONFIG_EXT3_FS_POSIX_ACL
1071                 case Opt_acl:
1072                         set_opt(sbi->s_mount_opt, POSIX_ACL);
1073                         break;
1074                 case Opt_noacl:
1075                         clear_opt(sbi->s_mount_opt, POSIX_ACL);
1076                         break;
1077 #else
1078                 case Opt_acl:
1079                 case Opt_noacl:
1080                         ext3_msg(sb, KERN_INFO,
1081                                 "(no)acl options not supported");
1082                         break;
1083 #endif
1084                 case Opt_reservation:
1085                         set_opt(sbi->s_mount_opt, RESERVATION);
1086                         break;
1087                 case Opt_noreservation:
1088                         clear_opt(sbi->s_mount_opt, RESERVATION);
1089                         break;
1090                 case Opt_journal_update:
1091                         /* @@@ FIXME */
1092                         /* Eventually we will want to be able to create
1093                            a journal file here.  For now, only allow the
1094                            user to specify an existing inode to be the
1095                            journal file. */
1096                         if (is_remount) {
1097                                 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1098                                         "journal on remount");
1099                                 return 0;
1100                         }
1101                         set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
1102                         break;
1103                 case Opt_journal_inum:
1104                         if (is_remount) {
1105                                 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1106                                        "journal on remount");
1107                                 return 0;
1108                         }
1109                         if (match_int(&args[0], &option))
1110                                 return 0;
1111                         *inum = option;
1112                         break;
1113                 case Opt_journal_dev:
1114                         if (is_remount) {
1115                                 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1116                                        "journal on remount");
1117                                 return 0;
1118                         }
1119                         if (match_int(&args[0], &option))
1120                                 return 0;
1121                         *journal_devnum = option;
1122                         break;
1123                 case Opt_noload:
1124                         set_opt (sbi->s_mount_opt, NOLOAD);
1125                         break;
1126                 case Opt_commit:
1127                         if (match_int(&args[0], &option))
1128                                 return 0;
1129                         if (option < 0)
1130                                 return 0;
1131                         if (option == 0)
1132                                 option = JBD_DEFAULT_MAX_COMMIT_AGE;
1133                         sbi->s_commit_interval = HZ * option;
1134                         break;
1135                 case Opt_data_journal:
1136                         data_opt = EXT3_MOUNT_JOURNAL_DATA;
1137                         goto datacheck;
1138                 case Opt_data_ordered:
1139                         data_opt = EXT3_MOUNT_ORDERED_DATA;
1140                         goto datacheck;
1141                 case Opt_data_writeback:
1142                         data_opt = EXT3_MOUNT_WRITEBACK_DATA;
1143                 datacheck:
1144                         if (is_remount) {
1145                                 if (test_opt(sb, DATA_FLAGS) == data_opt)
1146                                         break;
1147                                 ext3_msg(sb, KERN_ERR,
1148                                         "error: cannot change "
1149                                         "data mode on remount. The filesystem "
1150                                         "is mounted in data=%s mode and you "
1151                                         "try to remount it in data=%s mode.",
1152                                         data_mode_string(test_opt(sb,
1153                                                         DATA_FLAGS)),
1154                                         data_mode_string(data_opt));
1155                                 return 0;
1156                         } else {
1157                                 clear_opt(sbi->s_mount_opt, DATA_FLAGS);
1158                                 sbi->s_mount_opt |= data_opt;
1159                         }
1160                         break;
1161                 case Opt_data_err_abort:
1162                         set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1163                         break;
1164                 case Opt_data_err_ignore:
1165                         clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1166                         break;
1167 #ifdef CONFIG_QUOTA
1168                 case Opt_usrjquota:
1169                         if (!set_qf_name(sb, USRQUOTA, &args[0]))
1170                                 return 0;
1171                         break;
1172                 case Opt_grpjquota:
1173                         if (!set_qf_name(sb, GRPQUOTA, &args[0]))
1174                                 return 0;
1175                         break;
1176                 case Opt_offusrjquota:
1177                         if (!clear_qf_name(sb, USRQUOTA))
1178                                 return 0;
1179                         break;
1180                 case Opt_offgrpjquota:
1181                         if (!clear_qf_name(sb, GRPQUOTA))
1182                                 return 0;
1183                         break;
1184                 case Opt_jqfmt_vfsold:
1185                         qfmt = QFMT_VFS_OLD;
1186                         goto set_qf_format;
1187                 case Opt_jqfmt_vfsv0:
1188                         qfmt = QFMT_VFS_V0;
1189                         goto set_qf_format;
1190                 case Opt_jqfmt_vfsv1:
1191                         qfmt = QFMT_VFS_V1;
1192 set_qf_format:
1193                         if (sb_any_quota_loaded(sb) &&
1194                             sbi->s_jquota_fmt != qfmt) {
1195                                 ext3_msg(sb, KERN_ERR, "error: cannot change "
1196                                         "journaled quota options when "
1197                                         "quota turned on.");
1198                                 return 0;
1199                         }
1200                         sbi->s_jquota_fmt = qfmt;
1201                         break;
1202                 case Opt_quota:
1203                 case Opt_usrquota:
1204                         set_opt(sbi->s_mount_opt, QUOTA);
1205                         set_opt(sbi->s_mount_opt, USRQUOTA);
1206                         break;
1207                 case Opt_grpquota:
1208                         set_opt(sbi->s_mount_opt, QUOTA);
1209                         set_opt(sbi->s_mount_opt, GRPQUOTA);
1210                         break;
1211                 case Opt_noquota:
1212                         if (sb_any_quota_loaded(sb)) {
1213                                 ext3_msg(sb, KERN_ERR, "error: cannot change "
1214                                         "quota options when quota turned on.");
1215                                 return 0;
1216                         }
1217                         clear_opt(sbi->s_mount_opt, QUOTA);
1218                         clear_opt(sbi->s_mount_opt, USRQUOTA);
1219                         clear_opt(sbi->s_mount_opt, GRPQUOTA);
1220                         break;
1221 #else
1222                 case Opt_quota:
1223                 case Opt_usrquota:
1224                 case Opt_grpquota:
1225                         ext3_msg(sb, KERN_ERR,
1226                                 "error: quota options not supported.");
1227                         break;
1228                 case Opt_usrjquota:
1229                 case Opt_grpjquota:
1230                 case Opt_offusrjquota:
1231                 case Opt_offgrpjquota:
1232                 case Opt_jqfmt_vfsold:
1233                 case Opt_jqfmt_vfsv0:
1234                 case Opt_jqfmt_vfsv1:
1235                         ext3_msg(sb, KERN_ERR,
1236                                 "error: journaled quota options not "
1237                                 "supported.");
1238                         break;
1239                 case Opt_noquota:
1240                         break;
1241 #endif
1242                 case Opt_abort:
1243                         set_opt(sbi->s_mount_opt, ABORT);
1244                         break;
1245                 case Opt_nobarrier:
1246                         clear_opt(sbi->s_mount_opt, BARRIER);
1247                         break;
1248                 case Opt_barrier:
1249                         if (args[0].from) {
1250                                 if (match_int(&args[0], &option))
1251                                         return 0;
1252                         } else
1253                                 option = 1;     /* No argument, default to 1 */
1254                         if (option)
1255                                 set_opt(sbi->s_mount_opt, BARRIER);
1256                         else
1257                                 clear_opt(sbi->s_mount_opt, BARRIER);
1258                         break;
1259                 case Opt_ignore:
1260                         break;
1261                 case Opt_resize:
1262                         if (!is_remount) {
1263                                 ext3_msg(sb, KERN_ERR,
1264                                         "error: resize option only available "
1265                                         "for remount");
1266                                 return 0;
1267                         }
1268                         if (match_int(&args[0], &option) != 0)
1269                                 return 0;
1270                         *n_blocks_count = option;
1271                         break;
1272                 case Opt_nobh:
1273                         ext3_msg(sb, KERN_WARNING,
1274                                 "warning: ignoring deprecated nobh option");
1275                         break;
1276                 case Opt_bh:
1277                         ext3_msg(sb, KERN_WARNING,
1278                                 "warning: ignoring deprecated bh option");
1279                         break;
1280                 default:
1281                         ext3_msg(sb, KERN_ERR,
1282                                 "error: unrecognized mount option \"%s\" "
1283                                 "or missing value", p);
1284                         return 0;
1285                 }
1286         }
1287 #ifdef CONFIG_QUOTA
1288         if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1289                 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
1290                         clear_opt(sbi->s_mount_opt, USRQUOTA);
1291                 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
1292                         clear_opt(sbi->s_mount_opt, GRPQUOTA);
1293
1294                 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
1295                         ext3_msg(sb, KERN_ERR, "error: old and new quota "
1296                                         "format mixing.");
1297                         return 0;
1298                 }
1299
1300                 if (!sbi->s_jquota_fmt) {
1301                         ext3_msg(sb, KERN_ERR, "error: journaled quota format "
1302                                         "not specified.");
1303                         return 0;
1304                 }
1305         } else {
1306                 if (sbi->s_jquota_fmt) {
1307                         ext3_msg(sb, KERN_ERR, "error: journaled quota format "
1308                                         "specified with no journaling "
1309                                         "enabled.");
1310                         return 0;
1311                 }
1312         }
1313 #endif
1314         return 1;
1315 }
1316
1317 static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1318                             int read_only)
1319 {
1320         struct ext3_sb_info *sbi = EXT3_SB(sb);
1321         int res = 0;
1322
1323         if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
1324                 ext3_msg(sb, KERN_ERR,
1325                         "error: revision level too high, "
1326                         "forcing read-only mode");
1327                 res = MS_RDONLY;
1328         }
1329         if (read_only)
1330                 return res;
1331         if (!(sbi->s_mount_state & EXT3_VALID_FS))
1332                 ext3_msg(sb, KERN_WARNING,
1333                         "warning: mounting unchecked fs, "
1334                         "running e2fsck is recommended");
1335         else if ((sbi->s_mount_state & EXT3_ERROR_FS))
1336                 ext3_msg(sb, KERN_WARNING,
1337                         "warning: mounting fs with errors, "
1338                         "running e2fsck is recommended");
1339         else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
1340                  le16_to_cpu(es->s_mnt_count) >=
1341                         le16_to_cpu(es->s_max_mnt_count))
1342                 ext3_msg(sb, KERN_WARNING,
1343                         "warning: maximal mount count reached, "
1344                         "running e2fsck is recommended");
1345         else if (le32_to_cpu(es->s_checkinterval) &&
1346                 (le32_to_cpu(es->s_lastcheck) +
1347                         le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1348                 ext3_msg(sb, KERN_WARNING,
1349                         "warning: checktime reached, "
1350                         "running e2fsck is recommended");
1351 #if 0
1352                 /* @@@ We _will_ want to clear the valid bit if we find
1353                    inconsistencies, to force a fsck at reboot.  But for
1354                    a plain journaled filesystem we can keep it set as
1355                    valid forever! :) */
1356         es->s_state &= cpu_to_le16(~EXT3_VALID_FS);
1357 #endif
1358         if (!le16_to_cpu(es->s_max_mnt_count))
1359                 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
1360         le16_add_cpu(&es->s_mnt_count, 1);
1361         es->s_mtime = cpu_to_le32(get_seconds());
1362         ext3_update_dynamic_rev(sb);
1363         EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1364
1365         ext3_commit_super(sb, es, 1);
1366         if (test_opt(sb, DEBUG))
1367                 ext3_msg(sb, KERN_INFO, "[bs=%lu, gc=%lu, "
1368                                 "bpg=%lu, ipg=%lu, mo=%04lx]",
1369                         sb->s_blocksize,
1370                         sbi->s_groups_count,
1371                         EXT3_BLOCKS_PER_GROUP(sb),
1372                         EXT3_INODES_PER_GROUP(sb),
1373                         sbi->s_mount_opt);
1374
1375         if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1376                 char b[BDEVNAME_SIZE];
1377                 ext3_msg(sb, KERN_INFO, "using external journal on %s",
1378                         bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1379         } else {
1380                 ext3_msg(sb, KERN_INFO, "using internal journal");
1381         }
1382         cleancache_init_fs(sb);
1383         return res;
1384 }
1385
1386 /* Called at mount-time, super-block is locked */
1387 static int ext3_check_descriptors(struct super_block *sb)
1388 {
1389         struct ext3_sb_info *sbi = EXT3_SB(sb);
1390         int i;
1391
1392         ext3_debug ("Checking group descriptors");
1393
1394         for (i = 0; i < sbi->s_groups_count; i++) {
1395                 struct ext3_group_desc *gdp = ext3_get_group_desc(sb, i, NULL);
1396                 ext3_fsblk_t first_block = ext3_group_first_block_no(sb, i);
1397                 ext3_fsblk_t last_block;
1398
1399                 if (i == sbi->s_groups_count - 1)
1400                         last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
1401                 else
1402                         last_block = first_block +
1403                                 (EXT3_BLOCKS_PER_GROUP(sb) - 1);
1404
1405                 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
1406                     le32_to_cpu(gdp->bg_block_bitmap) > last_block)
1407                 {
1408                         ext3_error (sb, "ext3_check_descriptors",
1409                                     "Block bitmap for group %d"
1410                                     " not in group (block %lu)!",
1411                                     i, (unsigned long)
1412                                         le32_to_cpu(gdp->bg_block_bitmap));
1413                         return 0;
1414                 }
1415                 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
1416                     le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
1417                 {
1418                         ext3_error (sb, "ext3_check_descriptors",
1419                                     "Inode bitmap for group %d"
1420                                     " not in group (block %lu)!",
1421                                     i, (unsigned long)
1422                                         le32_to_cpu(gdp->bg_inode_bitmap));
1423                         return 0;
1424                 }
1425                 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
1426                     le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
1427                     last_block)
1428                 {
1429                         ext3_error (sb, "ext3_check_descriptors",
1430                                     "Inode table for group %d"
1431                                     " not in group (block %lu)!",
1432                                     i, (unsigned long)
1433                                         le32_to_cpu(gdp->bg_inode_table));
1434                         return 0;
1435                 }
1436         }
1437
1438         sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1439         sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1440         return 1;
1441 }
1442
1443
1444 /* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1445  * the superblock) which were deleted from all directories, but held open by
1446  * a process at the time of a crash.  We walk the list and try to delete these
1447  * inodes at recovery time (only with a read-write filesystem).
1448  *
1449  * In order to keep the orphan inode chain consistent during traversal (in
1450  * case of crash during recovery), we link each inode into the superblock
1451  * orphan list_head and handle it the same way as an inode deletion during
1452  * normal operation (which journals the operations for us).
1453  *
1454  * We only do an iget() and an iput() on each inode, which is very safe if we
1455  * accidentally point at an in-use or already deleted inode.  The worst that
1456  * can happen in this case is that we get a "bit already cleared" message from
1457  * ext3_free_inode().  The only reason we would point at a wrong inode is if
1458  * e2fsck was run on this filesystem, and it must have already done the orphan
1459  * inode cleanup for us, so we can safely abort without any further action.
1460  */
1461 static void ext3_orphan_cleanup (struct super_block * sb,
1462                                  struct ext3_super_block * es)
1463 {
1464         unsigned int s_flags = sb->s_flags;
1465         int nr_orphans = 0, nr_truncates = 0;
1466 #ifdef CONFIG_QUOTA
1467         int i;
1468 #endif
1469         if (!es->s_last_orphan) {
1470                 jbd_debug(4, "no orphan inodes to clean up\n");
1471                 return;
1472         }
1473
1474         if (bdev_read_only(sb->s_bdev)) {
1475                 ext3_msg(sb, KERN_ERR, "error: write access "
1476                         "unavailable, skipping orphan cleanup.");
1477                 return;
1478         }
1479
1480         /* Check if feature set allows readwrite operations */
1481         if (EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP)) {
1482                 ext3_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
1483                          "unknown ROCOMPAT features");
1484                 return;
1485         }
1486
1487         if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1488                 if (es->s_last_orphan)
1489                         jbd_debug(1, "Errors on filesystem, "
1490                                   "clearing orphan list.\n");
1491                 es->s_last_orphan = 0;
1492                 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1493                 return;
1494         }
1495
1496         if (s_flags & MS_RDONLY) {
1497                 ext3_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
1498                 sb->s_flags &= ~MS_RDONLY;
1499         }
1500 #ifdef CONFIG_QUOTA
1501         /* Needed for iput() to work correctly and not trash data */
1502         sb->s_flags |= MS_ACTIVE;
1503         /* Turn on quotas so that they are updated correctly */
1504         for (i = 0; i < MAXQUOTAS; i++) {
1505                 if (EXT3_SB(sb)->s_qf_names[i]) {
1506                         int ret = ext3_quota_on_mount(sb, i);
1507                         if (ret < 0)
1508                                 ext3_msg(sb, KERN_ERR,
1509                                         "error: cannot turn on journaled "
1510                                         "quota: %d", ret);
1511                 }
1512         }
1513 #endif
1514
1515         while (es->s_last_orphan) {
1516                 struct inode *inode;
1517
1518                 inode = ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1519                 if (IS_ERR(inode)) {
1520                         es->s_last_orphan = 0;
1521                         break;
1522                 }
1523
1524                 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1525                 dquot_initialize(inode);
1526                 if (inode->i_nlink) {
1527                         printk(KERN_DEBUG
1528                                 "%s: truncating inode %lu to %Ld bytes\n",
1529                                 __func__, inode->i_ino, inode->i_size);
1530                         jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1531                                   inode->i_ino, inode->i_size);
1532                         ext3_truncate(inode);
1533                         nr_truncates++;
1534                 } else {
1535                         printk(KERN_DEBUG
1536                                 "%s: deleting unreferenced inode %lu\n",
1537                                 __func__, inode->i_ino);
1538                         jbd_debug(2, "deleting unreferenced inode %lu\n",
1539                                   inode->i_ino);
1540                         nr_orphans++;
1541                 }
1542                 iput(inode);  /* The delete magic happens here! */
1543         }
1544
1545 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1546
1547         if (nr_orphans)
1548                 ext3_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
1549                        PLURAL(nr_orphans));
1550         if (nr_truncates)
1551                 ext3_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
1552                        PLURAL(nr_truncates));
1553 #ifdef CONFIG_QUOTA
1554         /* Turn quotas off */
1555         for (i = 0; i < MAXQUOTAS; i++) {
1556                 if (sb_dqopt(sb)->files[i])
1557                         dquot_quota_off(sb, i);
1558         }
1559 #endif
1560         sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1561 }
1562
1563 /*
1564  * Maximal file size.  There is a direct, and {,double-,triple-}indirect
1565  * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1566  * We need to be 1 filesystem block less than the 2^32 sector limit.
1567  */
1568 static loff_t ext3_max_size(int bits)
1569 {
1570         loff_t res = EXT3_NDIR_BLOCKS;
1571         int meta_blocks;
1572         loff_t upper_limit;
1573
1574         /* This is calculated to be the largest file size for a
1575          * dense, file such that the total number of
1576          * sectors in the file, including data and all indirect blocks,
1577          * does not exceed 2^32 -1
1578          * __u32 i_blocks representing the total number of
1579          * 512 bytes blocks of the file
1580          */
1581         upper_limit = (1LL << 32) - 1;
1582
1583         /* total blocks in file system block size */
1584         upper_limit >>= (bits - 9);
1585
1586
1587         /* indirect blocks */
1588         meta_blocks = 1;
1589         /* double indirect blocks */
1590         meta_blocks += 1 + (1LL << (bits-2));
1591         /* tripple indirect blocks */
1592         meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1593
1594         upper_limit -= meta_blocks;
1595         upper_limit <<= bits;
1596
1597         res += 1LL << (bits-2);
1598         res += 1LL << (2*(bits-2));
1599         res += 1LL << (3*(bits-2));
1600         res <<= bits;
1601         if (res > upper_limit)
1602                 res = upper_limit;
1603
1604         if (res > MAX_LFS_FILESIZE)
1605                 res = MAX_LFS_FILESIZE;
1606
1607         return res;
1608 }
1609
1610 static ext3_fsblk_t descriptor_loc(struct super_block *sb,
1611                                     ext3_fsblk_t logic_sb_block,
1612                                     int nr)
1613 {
1614         struct ext3_sb_info *sbi = EXT3_SB(sb);
1615         unsigned long bg, first_meta_bg;
1616         int has_super = 0;
1617
1618         first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1619
1620         if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1621             nr < first_meta_bg)
1622                 return (logic_sb_block + nr + 1);
1623         bg = sbi->s_desc_per_block * nr;
1624         if (ext3_bg_has_super(sb, bg))
1625                 has_super = 1;
1626         return (has_super + ext3_group_first_block_no(sb, bg));
1627 }
1628
1629
1630 static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1631 {
1632         struct buffer_head * bh;
1633         struct ext3_super_block *es = NULL;
1634         struct ext3_sb_info *sbi;
1635         ext3_fsblk_t block;
1636         ext3_fsblk_t sb_block = get_sb_block(&data, sb);
1637         ext3_fsblk_t logic_sb_block;
1638         unsigned long offset = 0;
1639         unsigned int journal_inum = 0;
1640         unsigned long journal_devnum = 0;
1641         unsigned long def_mount_opts;
1642         struct inode *root;
1643         int blocksize;
1644         int hblock;
1645         int db_count;
1646         int i;
1647         int needs_recovery;
1648         int ret = -EINVAL;
1649         __le32 features;
1650         int err;
1651
1652         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1653         if (!sbi)
1654                 return -ENOMEM;
1655
1656         sbi->s_blockgroup_lock =
1657                 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
1658         if (!sbi->s_blockgroup_lock) {
1659                 kfree(sbi);
1660                 return -ENOMEM;
1661         }
1662         sb->s_fs_info = sbi;
1663         sbi->s_mount_opt = 0;
1664         sbi->s_resuid = EXT3_DEF_RESUID;
1665         sbi->s_resgid = EXT3_DEF_RESGID;
1666         sbi->s_sb_block = sb_block;
1667
1668         blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1669         if (!blocksize) {
1670                 ext3_msg(sb, KERN_ERR, "error: unable to set blocksize");
1671                 goto out_fail;
1672         }
1673
1674         /*
1675          * The ext3 superblock will not be buffer aligned for other than 1kB
1676          * block sizes.  We need to calculate the offset from buffer start.
1677          */
1678         if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1679                 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1680                 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1681         } else {
1682                 logic_sb_block = sb_block;
1683         }
1684
1685         if (!(bh = sb_bread(sb, logic_sb_block))) {
1686                 ext3_msg(sb, KERN_ERR, "error: unable to read superblock");
1687                 goto out_fail;
1688         }
1689         /*
1690          * Note: s_es must be initialized as soon as possible because
1691          *       some ext3 macro-instructions depend on its value
1692          */
1693         es = (struct ext3_super_block *) (bh->b_data + offset);
1694         sbi->s_es = es;
1695         sb->s_magic = le16_to_cpu(es->s_magic);
1696         if (sb->s_magic != EXT3_SUPER_MAGIC)
1697                 goto cantfind_ext3;
1698
1699         /* Set defaults before we parse the mount options */
1700         def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1701         if (def_mount_opts & EXT3_DEFM_DEBUG)
1702                 set_opt(sbi->s_mount_opt, DEBUG);
1703         if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1704                 set_opt(sbi->s_mount_opt, GRPID);
1705         if (def_mount_opts & EXT3_DEFM_UID16)
1706                 set_opt(sbi->s_mount_opt, NO_UID32);
1707 #ifdef CONFIG_EXT3_FS_XATTR
1708         if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1709                 set_opt(sbi->s_mount_opt, XATTR_USER);
1710 #endif
1711 #ifdef CONFIG_EXT3_FS_POSIX_ACL
1712         if (def_mount_opts & EXT3_DEFM_ACL)
1713                 set_opt(sbi->s_mount_opt, POSIX_ACL);
1714 #endif
1715         if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1716                 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1717         else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1718                 set_opt(sbi->s_mount_opt, ORDERED_DATA);
1719         else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1720                 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
1721
1722         if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1723                 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1724         else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_CONTINUE)
1725                 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1726         else
1727                 set_opt(sbi->s_mount_opt, ERRORS_RO);
1728
1729         sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1730         sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1731
1732         /* enable barriers by default */
1733         set_opt(sbi->s_mount_opt, BARRIER);
1734         set_opt(sbi->s_mount_opt, RESERVATION);
1735
1736         if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1737                             NULL, 0))
1738                 goto failed_mount;
1739
1740         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1741                 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
1742
1743         if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1744             (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1745              EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1746              EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1747                 ext3_msg(sb, KERN_WARNING,
1748                         "warning: feature flags set on rev 0 fs, "
1749                         "running e2fsck is recommended");
1750         /*
1751          * Check feature flags regardless of the revision level, since we
1752          * previously didn't change the revision level when setting the flags,
1753          * so there is a chance incompat flags are set on a rev 0 filesystem.
1754          */
1755         features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1756         if (features) {
1757                 ext3_msg(sb, KERN_ERR,
1758                         "error: couldn't mount because of unsupported "
1759                         "optional features (%x)", le32_to_cpu(features));
1760                 goto failed_mount;
1761         }
1762         features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1763         if (!(sb->s_flags & MS_RDONLY) && features) {
1764                 ext3_msg(sb, KERN_ERR,
1765                         "error: couldn't mount RDWR because of unsupported "
1766                         "optional features (%x)", le32_to_cpu(features));
1767                 goto failed_mount;
1768         }
1769         blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1770
1771         if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1772             blocksize > EXT3_MAX_BLOCK_SIZE) {
1773                 ext3_msg(sb, KERN_ERR,
1774                         "error: couldn't mount because of unsupported "
1775                         "filesystem blocksize %d", blocksize);
1776                 goto failed_mount;
1777         }
1778
1779         hblock = bdev_logical_block_size(sb->s_bdev);
1780         if (sb->s_blocksize != blocksize) {
1781                 /*
1782                  * Make sure the blocksize for the filesystem is larger
1783                  * than the hardware sectorsize for the machine.
1784                  */
1785                 if (blocksize < hblock) {
1786                         ext3_msg(sb, KERN_ERR,
1787                                 "error: fsblocksize %d too small for "
1788                                 "hardware sectorsize %d", blocksize, hblock);
1789                         goto failed_mount;
1790                 }
1791
1792                 brelse (bh);
1793                 if (!sb_set_blocksize(sb, blocksize)) {
1794                         ext3_msg(sb, KERN_ERR,
1795                                 "error: bad blocksize %d", blocksize);
1796                         goto out_fail;
1797                 }
1798                 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1799                 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1800                 bh = sb_bread(sb, logic_sb_block);
1801                 if (!bh) {
1802                         ext3_msg(sb, KERN_ERR,
1803                                "error: can't read superblock on 2nd try");
1804                         goto failed_mount;
1805                 }
1806                 es = (struct ext3_super_block *)(bh->b_data + offset);
1807                 sbi->s_es = es;
1808                 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
1809                         ext3_msg(sb, KERN_ERR,
1810                                 "error: magic mismatch");
1811                         goto failed_mount;
1812                 }
1813         }
1814
1815         sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1816
1817         if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1818                 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1819                 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1820         } else {
1821                 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1822                 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1823                 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
1824                     (!is_power_of_2(sbi->s_inode_size)) ||
1825                     (sbi->s_inode_size > blocksize)) {
1826                         ext3_msg(sb, KERN_ERR,
1827                                 "error: unsupported inode size: %d",
1828                                 sbi->s_inode_size);
1829                         goto failed_mount;
1830                 }
1831         }
1832         sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1833                                    le32_to_cpu(es->s_log_frag_size);
1834         if (blocksize != sbi->s_frag_size) {
1835                 ext3_msg(sb, KERN_ERR,
1836                        "error: fragsize %lu != blocksize %u (unsupported)",
1837                        sbi->s_frag_size, blocksize);
1838                 goto failed_mount;
1839         }
1840         sbi->s_frags_per_block = 1;
1841         sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1842         sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1843         sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1844         if (EXT3_INODE_SIZE(sb) == 0 || EXT3_INODES_PER_GROUP(sb) == 0)
1845                 goto cantfind_ext3;
1846         sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1847         if (sbi->s_inodes_per_block == 0)
1848                 goto cantfind_ext3;
1849         sbi->s_itb_per_group = sbi->s_inodes_per_group /
1850                                         sbi->s_inodes_per_block;
1851         sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1852         sbi->s_sbh = bh;
1853         sbi->s_mount_state = le16_to_cpu(es->s_state);
1854         sbi->s_addr_per_block_bits = ilog2(EXT3_ADDR_PER_BLOCK(sb));
1855         sbi->s_desc_per_block_bits = ilog2(EXT3_DESC_PER_BLOCK(sb));
1856         for (i=0; i < 4; i++)
1857                 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1858         sbi->s_def_hash_version = es->s_def_hash_version;
1859         i = le32_to_cpu(es->s_flags);
1860         if (i & EXT2_FLAGS_UNSIGNED_HASH)
1861                 sbi->s_hash_unsigned = 3;
1862         else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
1863 #ifdef __CHAR_UNSIGNED__
1864                 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
1865                 sbi->s_hash_unsigned = 3;
1866 #else
1867                 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
1868 #endif
1869         }
1870
1871         if (sbi->s_blocks_per_group > blocksize * 8) {
1872                 ext3_msg(sb, KERN_ERR,
1873                         "#blocks per group too big: %lu",
1874                         sbi->s_blocks_per_group);
1875                 goto failed_mount;
1876         }
1877         if (sbi->s_frags_per_group > blocksize * 8) {
1878                 ext3_msg(sb, KERN_ERR,
1879                         "error: #fragments per group too big: %lu",
1880                         sbi->s_frags_per_group);
1881                 goto failed_mount;
1882         }
1883         if (sbi->s_inodes_per_group > blocksize * 8) {
1884                 ext3_msg(sb, KERN_ERR,
1885                         "error: #inodes per group too big: %lu",
1886                         sbi->s_inodes_per_group);
1887                 goto failed_mount;
1888         }
1889
1890         err = generic_check_addressable(sb->s_blocksize_bits,
1891                                         le32_to_cpu(es->s_blocks_count));
1892         if (err) {
1893                 ext3_msg(sb, KERN_ERR,
1894                         "error: filesystem is too large to mount safely");
1895                 if (sizeof(sector_t) < 8)
1896                         ext3_msg(sb, KERN_ERR,
1897                                 "error: CONFIG_LBDAF not enabled");
1898                 ret = err;
1899                 goto failed_mount;
1900         }
1901
1902         if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1903                 goto cantfind_ext3;
1904         sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1905                                le32_to_cpu(es->s_first_data_block) - 1)
1906                                        / EXT3_BLOCKS_PER_GROUP(sb)) + 1;
1907         db_count = DIV_ROUND_UP(sbi->s_groups_count, EXT3_DESC_PER_BLOCK(sb));
1908         sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1909                                     GFP_KERNEL);
1910         if (sbi->s_group_desc == NULL) {
1911                 ext3_msg(sb, KERN_ERR,
1912                         "error: not enough memory");
1913                 ret = -ENOMEM;
1914                 goto failed_mount;
1915         }
1916
1917         bgl_lock_init(sbi->s_blockgroup_lock);
1918
1919         for (i = 0; i < db_count; i++) {
1920                 block = descriptor_loc(sb, logic_sb_block, i);
1921                 sbi->s_group_desc[i] = sb_bread(sb, block);
1922                 if (!sbi->s_group_desc[i]) {
1923                         ext3_msg(sb, KERN_ERR,
1924                                 "error: can't read group descriptor %d", i);
1925                         db_count = i;
1926                         goto failed_mount2;
1927                 }
1928         }
1929         if (!ext3_check_descriptors (sb)) {
1930                 ext3_msg(sb, KERN_ERR,
1931                         "error: group descriptors corrupted");
1932                 goto failed_mount2;
1933         }
1934         sbi->s_gdb_count = db_count;
1935         get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1936         spin_lock_init(&sbi->s_next_gen_lock);
1937
1938         /* per fileystem reservation list head & lock */
1939         spin_lock_init(&sbi->s_rsv_window_lock);
1940         sbi->s_rsv_window_root = RB_ROOT;
1941         /* Add a single, static dummy reservation to the start of the
1942          * reservation window list --- it gives us a placeholder for
1943          * append-at-start-of-list which makes the allocation logic
1944          * _much_ simpler. */
1945         sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1946         sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1947         sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1948         sbi->s_rsv_window_head.rsv_goal_size = 0;
1949         ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1950
1951         /*
1952          * set up enough so that it can read an inode
1953          */
1954         sb->s_op = &ext3_sops;
1955         sb->s_export_op = &ext3_export_ops;
1956         sb->s_xattr = ext3_xattr_handlers;
1957 #ifdef CONFIG_QUOTA
1958         sb->s_qcop = &ext3_qctl_operations;
1959         sb->dq_op = &ext3_quota_operations;
1960 #endif
1961         memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
1962         INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1963         mutex_init(&sbi->s_orphan_lock);
1964         mutex_init(&sbi->s_resize_lock);
1965
1966         sb->s_root = NULL;
1967
1968         needs_recovery = (es->s_last_orphan != 0 ||
1969                           EXT3_HAS_INCOMPAT_FEATURE(sb,
1970                                     EXT3_FEATURE_INCOMPAT_RECOVER));
1971
1972         /*
1973          * The first inode we look at is the journal inode.  Don't try
1974          * root first: it may be modified in the journal!
1975          */
1976         if (!test_opt(sb, NOLOAD) &&
1977             EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
1978                 if (ext3_load_journal(sb, es, journal_devnum))
1979                         goto failed_mount2;
1980         } else if (journal_inum) {
1981                 if (ext3_create_journal(sb, es, journal_inum))
1982                         goto failed_mount2;
1983         } else {
1984                 if (!silent)
1985                         ext3_msg(sb, KERN_ERR,
1986                                 "error: no journal found. "
1987                                 "mounting ext3 over ext2?");
1988                 goto failed_mount2;
1989         }
1990         err = percpu_counter_init(&sbi->s_freeblocks_counter,
1991                         ext3_count_free_blocks(sb));
1992         if (!err) {
1993                 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1994                                 ext3_count_free_inodes(sb));
1995         }
1996         if (!err) {
1997                 err = percpu_counter_init(&sbi->s_dirs_counter,
1998                                 ext3_count_dirs(sb));
1999         }
2000         if (err) {
2001                 ext3_msg(sb, KERN_ERR, "error: insufficient memory");
2002                 ret = err;
2003                 goto failed_mount3;
2004         }
2005
2006         /* We have now updated the journal if required, so we can
2007          * validate the data journaling mode. */
2008         switch (test_opt(sb, DATA_FLAGS)) {
2009         case 0:
2010                 /* No mode set, assume a default based on the journal
2011                    capabilities: ORDERED_DATA if the journal can
2012                    cope, else JOURNAL_DATA */
2013                 if (journal_check_available_features
2014                     (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
2015                         set_opt(sbi->s_mount_opt, DEFAULT_DATA_MODE);
2016                 else
2017                         set_opt(sbi->s_mount_opt, JOURNAL_DATA);
2018                 break;
2019
2020         case EXT3_MOUNT_ORDERED_DATA:
2021         case EXT3_MOUNT_WRITEBACK_DATA:
2022                 if (!journal_check_available_features
2023                     (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
2024                         ext3_msg(sb, KERN_ERR,
2025                                 "error: journal does not support "
2026                                 "requested data journaling mode");
2027                         goto failed_mount3;
2028                 }
2029         default:
2030                 break;
2031         }
2032
2033         /*
2034          * The journal_load will have done any necessary log recovery,
2035          * so we can safely mount the rest of the filesystem now.
2036          */
2037
2038         root = ext3_iget(sb, EXT3_ROOT_INO);
2039         if (IS_ERR(root)) {
2040                 ext3_msg(sb, KERN_ERR, "error: get root inode failed");
2041                 ret = PTR_ERR(root);
2042                 goto failed_mount3;
2043         }
2044         if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
2045                 iput(root);
2046                 ext3_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck");
2047                 goto failed_mount3;
2048         }
2049         sb->s_root = d_alloc_root(root);
2050         if (!sb->s_root) {
2051                 ext3_msg(sb, KERN_ERR, "error: get root dentry failed");
2052                 iput(root);
2053                 ret = -ENOMEM;
2054                 goto failed_mount3;
2055         }
2056
2057         ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
2058
2059         EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
2060         ext3_orphan_cleanup(sb, es);
2061         EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
2062         if (needs_recovery)
2063                 ext3_msg(sb, KERN_INFO, "recovery complete");
2064         ext3_mark_recovery_complete(sb, es);
2065         ext3_msg(sb, KERN_INFO, "mounted filesystem with %s data mode",
2066                 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
2067                 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
2068                 "writeback");
2069
2070         return 0;
2071
2072 cantfind_ext3:
2073         if (!silent)
2074                 ext3_msg(sb, KERN_INFO,
2075                         "error: can't find ext3 filesystem on dev %s.",
2076                        sb->s_id);
2077         goto failed_mount;
2078
2079 failed_mount3:
2080         percpu_counter_destroy(&sbi->s_freeblocks_counter);
2081         percpu_counter_destroy(&sbi->s_freeinodes_counter);
2082         percpu_counter_destroy(&sbi->s_dirs_counter);
2083         journal_destroy(sbi->s_journal);
2084 failed_mount2:
2085         for (i = 0; i < db_count; i++)
2086                 brelse(sbi->s_group_desc[i]);
2087         kfree(sbi->s_group_desc);
2088 failed_mount:
2089 #ifdef CONFIG_QUOTA
2090         for (i = 0; i < MAXQUOTAS; i++)
2091                 kfree(sbi->s_qf_names[i]);
2092 #endif
2093         ext3_blkdev_remove(sbi);
2094         brelse(bh);
2095 out_fail:
2096         sb->s_fs_info = NULL;
2097         kfree(sbi->s_blockgroup_lock);
2098         kfree(sbi);
2099         return ret;
2100 }
2101
2102 /*
2103  * Setup any per-fs journal parameters now.  We'll do this both on
2104  * initial mount, once the journal has been initialised but before we've
2105  * done any recovery; and again on any subsequent remount.
2106  */
2107 static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
2108 {
2109         struct ext3_sb_info *sbi = EXT3_SB(sb);
2110
2111         if (sbi->s_commit_interval)
2112                 journal->j_commit_interval = sbi->s_commit_interval;
2113         /* We could also set up an ext3-specific default for the commit
2114          * interval here, but for now we'll just fall back to the jbd
2115          * default. */
2116
2117         spin_lock(&journal->j_state_lock);
2118         if (test_opt(sb, BARRIER))
2119                 journal->j_flags |= JFS_BARRIER;
2120         else
2121                 journal->j_flags &= ~JFS_BARRIER;
2122         if (test_opt(sb, DATA_ERR_ABORT))
2123                 journal->j_flags |= JFS_ABORT_ON_SYNCDATA_ERR;
2124         else
2125                 journal->j_flags &= ~JFS_ABORT_ON_SYNCDATA_ERR;
2126         spin_unlock(&journal->j_state_lock);
2127 }
2128
2129 static journal_t *ext3_get_journal(struct super_block *sb,
2130                                    unsigned int journal_inum)
2131 {
2132         struct inode *journal_inode;
2133         journal_t *journal;
2134
2135         /* First, test for the existence of a valid inode on disk.  Bad
2136          * things happen if we iget() an unused inode, as the subsequent
2137          * iput() will try to delete it. */
2138
2139         journal_inode = ext3_iget(sb, journal_inum);
2140         if (IS_ERR(journal_inode)) {
2141                 ext3_msg(sb, KERN_ERR, "error: no journal found");
2142                 return NULL;
2143         }
2144         if (!journal_inode->i_nlink) {
2145                 make_bad_inode(journal_inode);
2146                 iput(journal_inode);
2147                 ext3_msg(sb, KERN_ERR, "error: journal inode is deleted");
2148                 return NULL;
2149         }
2150
2151         jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2152                   journal_inode, journal_inode->i_size);
2153         if (!S_ISREG(journal_inode->i_mode)) {
2154                 ext3_msg(sb, KERN_ERR, "error: invalid journal inode");
2155                 iput(journal_inode);
2156                 return NULL;
2157         }
2158
2159         journal = journal_init_inode(journal_inode);
2160         if (!journal) {
2161                 ext3_msg(sb, KERN_ERR, "error: could not load journal inode");
2162                 iput(journal_inode);
2163                 return NULL;
2164         }
2165         journal->j_private = sb;
2166         ext3_init_journal_params(sb, journal);
2167         return journal;
2168 }
2169
2170 static journal_t *ext3_get_dev_journal(struct super_block *sb,
2171                                        dev_t j_dev)
2172 {
2173         struct buffer_head * bh;
2174         journal_t *journal;
2175         ext3_fsblk_t start;
2176         ext3_fsblk_t len;
2177         int hblock, blocksize;
2178         ext3_fsblk_t sb_block;
2179         unsigned long offset;
2180         struct ext3_super_block * es;
2181         struct block_device *bdev;
2182
2183         bdev = ext3_blkdev_get(j_dev, sb);
2184         if (bdev == NULL)
2185                 return NULL;
2186
2187         blocksize = sb->s_blocksize;
2188         hblock = bdev_logical_block_size(bdev);
2189         if (blocksize < hblock) {
2190                 ext3_msg(sb, KERN_ERR,
2191                         "error: blocksize too small for journal device");
2192                 goto out_bdev;
2193         }
2194
2195         sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
2196         offset = EXT3_MIN_BLOCK_SIZE % blocksize;
2197         set_blocksize(bdev, blocksize);
2198         if (!(bh = __bread(bdev, sb_block, blocksize))) {
2199                 ext3_msg(sb, KERN_ERR, "error: couldn't read superblock of "
2200                         "external journal");
2201                 goto out_bdev;
2202         }
2203
2204         es = (struct ext3_super_block *) (bh->b_data + offset);
2205         if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
2206             !(le32_to_cpu(es->s_feature_incompat) &
2207               EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2208                 ext3_msg(sb, KERN_ERR, "error: external journal has "
2209                         "bad superblock");
2210                 brelse(bh);
2211                 goto out_bdev;
2212         }
2213
2214         if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2215                 ext3_msg(sb, KERN_ERR, "error: journal UUID does not match");
2216                 brelse(bh);
2217                 goto out_bdev;
2218         }
2219
2220         len = le32_to_cpu(es->s_blocks_count);
2221         start = sb_block + 1;
2222         brelse(bh);     /* we're done with the superblock */
2223
2224         journal = journal_init_dev(bdev, sb->s_bdev,
2225                                         start, len, blocksize);
2226         if (!journal) {
2227                 ext3_msg(sb, KERN_ERR,
2228                         "error: failed to create device journal");
2229                 goto out_bdev;
2230         }
2231         journal->j_private = sb;
2232         ll_rw_block(READ, 1, &journal->j_sb_buffer);
2233         wait_on_buffer(journal->j_sb_buffer);
2234         if (!buffer_uptodate(journal->j_sb_buffer)) {
2235                 ext3_msg(sb, KERN_ERR, "I/O error on journal device");
2236                 goto out_journal;
2237         }
2238         if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
2239                 ext3_msg(sb, KERN_ERR,
2240                         "error: external journal has more than one "
2241                         "user (unsupported) - %d",
2242                         be32_to_cpu(journal->j_superblock->s_nr_users));
2243                 goto out_journal;
2244         }
2245         EXT3_SB(sb)->journal_bdev = bdev;
2246         ext3_init_journal_params(sb, journal);
2247         return journal;
2248 out_journal:
2249         journal_destroy(journal);
2250 out_bdev:
2251         ext3_blkdev_put(bdev);
2252         return NULL;
2253 }
2254
2255 static int ext3_load_journal(struct super_block *sb,
2256                              struct ext3_super_block *es,
2257                              unsigned long journal_devnum)
2258 {
2259         journal_t *journal;
2260         unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2261         dev_t journal_dev;
2262         int err = 0;
2263         int really_read_only;
2264
2265         if (journal_devnum &&
2266             journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2267                 ext3_msg(sb, KERN_INFO, "external journal device major/minor "
2268                         "numbers have changed");
2269                 journal_dev = new_decode_dev(journal_devnum);
2270         } else
2271                 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2272
2273         really_read_only = bdev_read_only(sb->s_bdev);
2274
2275         /*
2276          * Are we loading a blank journal or performing recovery after a
2277          * crash?  For recovery, we need to check in advance whether we
2278          * can get read-write access to the device.
2279          */
2280
2281         if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
2282                 if (sb->s_flags & MS_RDONLY) {
2283                         ext3_msg(sb, KERN_INFO,
2284                                 "recovery required on readonly filesystem");
2285                         if (really_read_only) {
2286                                 ext3_msg(sb, KERN_ERR, "error: write access "
2287                                         "unavailable, cannot proceed");
2288                                 return -EROFS;
2289                         }
2290                         ext3_msg(sb, KERN_INFO,
2291                                 "write access will be enabled during recovery");
2292                 }
2293         }
2294
2295         if (journal_inum && journal_dev) {
2296                 ext3_msg(sb, KERN_ERR, "error: filesystem has both journal "
2297                        "and inode journals");
2298                 return -EINVAL;
2299         }
2300
2301         if (journal_inum) {
2302                 if (!(journal = ext3_get_journal(sb, journal_inum)))
2303                         return -EINVAL;
2304         } else {
2305                 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
2306                         return -EINVAL;
2307         }
2308
2309         if (!(journal->j_flags & JFS_BARRIER))
2310                 printk(KERN_INFO "EXT3-fs: barriers not enabled\n");
2311
2312         if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2313                 err = journal_update_format(journal);
2314                 if (err)  {
2315                         ext3_msg(sb, KERN_ERR, "error updating journal");
2316                         journal_destroy(journal);
2317                         return err;
2318                 }
2319         }
2320
2321         if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
2322                 err = journal_wipe(journal, !really_read_only);
2323         if (!err)
2324                 err = journal_load(journal);
2325
2326         if (err) {
2327                 ext3_msg(sb, KERN_ERR, "error loading journal");
2328                 journal_destroy(journal);
2329                 return err;
2330         }
2331
2332         EXT3_SB(sb)->s_journal = journal;
2333         ext3_clear_journal_err(sb, es);
2334
2335         if (!really_read_only && journal_devnum &&
2336             journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2337                 es->s_journal_dev = cpu_to_le32(journal_devnum);
2338
2339                 /* Make sure we flush the recovery flag to disk. */
2340                 ext3_commit_super(sb, es, 1);
2341         }
2342
2343         return 0;
2344 }
2345
2346 static int ext3_create_journal(struct super_block *sb,
2347                                struct ext3_super_block *es,
2348                                unsigned int journal_inum)
2349 {
2350         journal_t *journal;
2351         int err;
2352
2353         if (sb->s_flags & MS_RDONLY) {
2354                 ext3_msg(sb, KERN_ERR,
2355                         "error: readonly filesystem when trying to "
2356                         "create journal");
2357                 return -EROFS;
2358         }
2359
2360         journal = ext3_get_journal(sb, journal_inum);
2361         if (!journal)
2362                 return -EINVAL;
2363
2364         ext3_msg(sb, KERN_INFO, "creating new journal on inode %u",
2365                journal_inum);
2366
2367         err = journal_create(journal);
2368         if (err) {
2369                 ext3_msg(sb, KERN_ERR, "error creating journal");
2370                 journal_destroy(journal);
2371                 return -EIO;
2372         }
2373
2374         EXT3_SB(sb)->s_journal = journal;
2375
2376         ext3_update_dynamic_rev(sb);
2377         EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2378         EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2379
2380         es->s_journal_inum = cpu_to_le32(journal_inum);
2381
2382         /* Make sure we flush the recovery flag to disk. */
2383         ext3_commit_super(sb, es, 1);
2384
2385         return 0;
2386 }
2387
2388 static int ext3_commit_super(struct super_block *sb,
2389                                struct ext3_super_block *es,
2390                                int sync)
2391 {
2392         struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
2393         int error = 0;
2394
2395         if (!sbh)
2396                 return error;
2397
2398         if (buffer_write_io_error(sbh)) {
2399                 /*
2400                  * Oh, dear.  A previous attempt to write the
2401                  * superblock failed.  This could happen because the
2402                  * USB device was yanked out.  Or it could happen to
2403                  * be a transient write error and maybe the block will
2404                  * be remapped.  Nothing we can do but to retry the
2405                  * write and hope for the best.
2406                  */
2407                 ext3_msg(sb, KERN_ERR, "previous I/O error to "
2408                        "superblock detected");
2409                 clear_buffer_write_io_error(sbh);
2410                 set_buffer_uptodate(sbh);
2411         }
2412         /*
2413          * If the file system is mounted read-only, don't update the
2414          * superblock write time.  This avoids updating the superblock
2415          * write time when we are mounting the root file system
2416          * read/only but we need to replay the journal; at that point,
2417          * for people who are east of GMT and who make their clock
2418          * tick in localtime for Windows bug-for-bug compatibility,
2419          * the clock is set in the future, and this will cause e2fsck
2420          * to complain and force a full file system check.
2421          */
2422         if (!(sb->s_flags & MS_RDONLY))
2423                 es->s_wtime = cpu_to_le32(get_seconds());
2424         es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2425         es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2426         BUFFER_TRACE(sbh, "marking dirty");
2427         mark_buffer_dirty(sbh);
2428         if (sync) {
2429                 error = sync_dirty_buffer(sbh);
2430                 if (buffer_write_io_error(sbh)) {
2431                         ext3_msg(sb, KERN_ERR, "I/O error while writing "
2432                                "superblock");
2433                         clear_buffer_write_io_error(sbh);
2434                         set_buffer_uptodate(sbh);
2435                 }
2436         }
2437         return error;
2438 }
2439
2440
2441 /*
2442  * Have we just finished recovery?  If so, and if we are mounting (or
2443  * remounting) the filesystem readonly, then we will end up with a
2444  * consistent fs on disk.  Record that fact.
2445  */
2446 static void ext3_mark_recovery_complete(struct super_block * sb,
2447                                         struct ext3_super_block * es)
2448 {
2449         journal_t *journal = EXT3_SB(sb)->s_journal;
2450
2451         journal_lock_updates(journal);
2452         if (journal_flush(journal) < 0)
2453                 goto out;
2454
2455         if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2456             sb->s_flags & MS_RDONLY) {
2457                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2458                 ext3_commit_super(sb, es, 1);
2459         }
2460
2461 out:
2462         journal_unlock_updates(journal);
2463 }
2464
2465 /*
2466  * If we are mounting (or read-write remounting) a filesystem whose journal
2467  * has recorded an error from a previous lifetime, move that error to the
2468  * main filesystem now.
2469  */
2470 static void ext3_clear_journal_err(struct super_block *sb,
2471                                    struct ext3_super_block *es)
2472 {
2473         journal_t *journal;
2474         int j_errno;
2475         const char *errstr;
2476
2477         journal = EXT3_SB(sb)->s_journal;
2478
2479         /*
2480          * Now check for any error status which may have been recorded in the
2481          * journal by a prior ext3_error() or ext3_abort()
2482          */
2483
2484         j_errno = journal_errno(journal);
2485         if (j_errno) {
2486                 char nbuf[16];
2487
2488                 errstr = ext3_decode_error(sb, j_errno, nbuf);
2489                 ext3_warning(sb, __func__, "Filesystem error recorded "
2490                              "from previous mount: %s", errstr);
2491                 ext3_warning(sb, __func__, "Marking fs in need of "
2492                              "filesystem check.");
2493
2494                 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2495                 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2496                 ext3_commit_super (sb, es, 1);
2497
2498                 journal_clear_err(journal);
2499         }
2500 }
2501
2502 /*
2503  * Force the running and committing transactions to commit,
2504  * and wait on the commit.
2505  */
2506 int ext3_force_commit(struct super_block *sb)
2507 {
2508         journal_t *journal;
2509         int ret;
2510
2511         if (sb->s_flags & MS_RDONLY)
2512                 return 0;
2513
2514         journal = EXT3_SB(sb)->s_journal;
2515         ret = ext3_journal_force_commit(journal);
2516         return ret;
2517 }
2518
2519 static int ext3_sync_fs(struct super_block *sb, int wait)
2520 {
2521         tid_t target;
2522
2523         trace_ext3_sync_fs(sb, wait);
2524         if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2525                 if (wait)
2526                         log_wait_commit(EXT3_SB(sb)->s_journal, target);
2527         }
2528         return 0;
2529 }
2530
2531 /*
2532  * LVM calls this function before a (read-only) snapshot is created.  This
2533  * gives us a chance to flush the journal completely and mark the fs clean.
2534  */
2535 static int ext3_freeze(struct super_block *sb)
2536 {
2537         int error = 0;
2538         journal_t *journal;
2539
2540         if (!(sb->s_flags & MS_RDONLY)) {
2541                 journal = EXT3_SB(sb)->s_journal;
2542
2543                 /* Now we set up the journal barrier. */
2544                 journal_lock_updates(journal);
2545
2546                 /*
2547                  * We don't want to clear needs_recovery flag when we failed
2548                  * to flush the journal.
2549                  */
2550                 error = journal_flush(journal);
2551                 if (error < 0)
2552                         goto out;
2553
2554                 /* Journal blocked and flushed, clear needs_recovery flag. */
2555                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2556                 error = ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2557                 if (error)
2558                         goto out;
2559         }
2560         return 0;
2561
2562 out:
2563         journal_unlock_updates(journal);
2564         return error;
2565 }
2566
2567 /*
2568  * Called by LVM after the snapshot is done.  We need to reset the RECOVER
2569  * flag here, even though the filesystem is not technically dirty yet.
2570  */
2571 static int ext3_unfreeze(struct super_block *sb)
2572 {
2573         if (!(sb->s_flags & MS_RDONLY)) {
2574                 lock_super(sb);
2575                 /* Reser the needs_recovery flag before the fs is unlocked. */
2576                 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2577                 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2578                 unlock_super(sb);
2579                 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2580         }
2581         return 0;
2582 }
2583
2584 static int ext3_remount (struct super_block * sb, int * flags, char * data)
2585 {
2586         struct ext3_super_block * es;
2587         struct ext3_sb_info *sbi = EXT3_SB(sb);
2588         ext3_fsblk_t n_blocks_count = 0;
2589         unsigned long old_sb_flags;
2590         struct ext3_mount_options old_opts;
2591         int enable_quota = 0;
2592         int err;
2593 #ifdef CONFIG_QUOTA
2594         int i;
2595 #endif
2596
2597         /* Store the original options */
2598         lock_super(sb);
2599         old_sb_flags = sb->s_flags;
2600         old_opts.s_mount_opt = sbi->s_mount_opt;
2601         old_opts.s_resuid = sbi->s_resuid;
2602         old_opts.s_resgid = sbi->s_resgid;
2603         old_opts.s_commit_interval = sbi->s_commit_interval;
2604 #ifdef CONFIG_QUOTA
2605         old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2606         for (i = 0; i < MAXQUOTAS; i++)
2607                 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2608 #endif
2609
2610         /*
2611          * Allow the "check" option to be passed as a remount option.
2612          */
2613         if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2614                 err = -EINVAL;
2615                 goto restore_opts;
2616         }
2617
2618         if (test_opt(sb, ABORT))
2619                 ext3_abort(sb, __func__, "Abort forced by user");
2620
2621         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2622                 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
2623
2624         es = sbi->s_es;
2625
2626         ext3_init_journal_params(sb, sbi->s_journal);
2627
2628         if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2629                 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
2630                 if (test_opt(sb, ABORT)) {
2631                         err = -EROFS;
2632                         goto restore_opts;
2633                 }
2634
2635                 if (*flags & MS_RDONLY) {
2636                         err = dquot_suspend(sb, -1);
2637                         if (err < 0)
2638                                 goto restore_opts;
2639
2640                         /*
2641                          * First of all, the unconditional stuff we have to do
2642                          * to disable replay of the journal when we next remount
2643                          */
2644                         sb->s_flags |= MS_RDONLY;
2645
2646                         /*
2647                          * OK, test if we are remounting a valid rw partition
2648                          * readonly, and if so set the rdonly flag and then
2649                          * mark the partition as valid again.
2650                          */
2651                         if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2652                             (sbi->s_mount_state & EXT3_VALID_FS))
2653                                 es->s_state = cpu_to_le16(sbi->s_mount_state);
2654
2655                         ext3_mark_recovery_complete(sb, es);
2656                 } else {
2657                         __le32 ret;
2658                         if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2659                                         ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2660                                 ext3_msg(sb, KERN_WARNING,
2661                                         "warning: couldn't remount RDWR "
2662                                         "because of unsupported optional "
2663                                         "features (%x)", le32_to_cpu(ret));
2664                                 err = -EROFS;
2665                                 goto restore_opts;
2666                         }
2667
2668                         /*
2669                          * If we have an unprocessed orphan list hanging
2670                          * around from a previously readonly bdev mount,
2671                          * require a full umount & mount for now.
2672                          */
2673                         if (es->s_last_orphan) {
2674                                 ext3_msg(sb, KERN_WARNING, "warning: couldn't "
2675                                        "remount RDWR because of unprocessed "
2676                                        "orphan inode list.  Please "
2677                                        "umount & mount instead.");
2678                                 err = -EINVAL;
2679                                 goto restore_opts;
2680                         }
2681
2682                         /*
2683                          * Mounting a RDONLY partition read-write, so reread
2684                          * and store the current valid flag.  (It may have
2685                          * been changed by e2fsck since we originally mounted
2686                          * the partition.)
2687                          */
2688                         ext3_clear_journal_err(sb, es);
2689                         sbi->s_mount_state = le16_to_cpu(es->s_state);
2690                         if ((err = ext3_group_extend(sb, es, n_blocks_count)))
2691                                 goto restore_opts;
2692                         if (!ext3_setup_super (sb, es, 0))
2693                                 sb->s_flags &= ~MS_RDONLY;
2694                         enable_quota = 1;
2695                 }
2696         }
2697 #ifdef CONFIG_QUOTA
2698         /* Release old quota file names */
2699         for (i = 0; i < MAXQUOTAS; i++)
2700                 if (old_opts.s_qf_names[i] &&
2701                     old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2702                         kfree(old_opts.s_qf_names[i]);
2703 #endif
2704         unlock_super(sb);
2705
2706         if (enable_quota)
2707                 dquot_resume(sb, -1);
2708         return 0;
2709 restore_opts:
2710         sb->s_flags = old_sb_flags;
2711         sbi->s_mount_opt = old_opts.s_mount_opt;
2712         sbi->s_resuid = old_opts.s_resuid;
2713         sbi->s_resgid = old_opts.s_resgid;
2714         sbi->s_commit_interval = old_opts.s_commit_interval;
2715 #ifdef CONFIG_QUOTA
2716         sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2717         for (i = 0; i < MAXQUOTAS; i++) {
2718                 if (sbi->s_qf_names[i] &&
2719                     old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2720                         kfree(sbi->s_qf_names[i]);
2721                 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2722         }
2723 #endif
2724         unlock_super(sb);
2725         return err;
2726 }
2727
2728 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
2729 {
2730         struct super_block *sb = dentry->d_sb;
2731         struct ext3_sb_info *sbi = EXT3_SB(sb);
2732         struct ext3_super_block *es = sbi->s_es;
2733         u64 fsid;
2734
2735         if (test_opt(sb, MINIX_DF)) {
2736                 sbi->s_overhead_last = 0;
2737         } else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
2738                 unsigned long ngroups = sbi->s_groups_count, i;
2739                 ext3_fsblk_t overhead = 0;
2740                 smp_rmb();
2741
2742                 /*
2743                  * Compute the overhead (FS structures).  This is constant
2744                  * for a given filesystem unless the number of block groups
2745                  * changes so we cache the previous value until it does.
2746                  */
2747
2748                 /*
2749                  * All of the blocks before first_data_block are
2750                  * overhead
2751                  */
2752                 overhead = le32_to_cpu(es->s_first_data_block);
2753
2754                 /*
2755                  * Add the overhead attributed to the superblock and
2756                  * block group descriptors.  If the sparse superblocks
2757                  * feature is turned on, then not all groups have this.
2758                  */
2759                 for (i = 0; i < ngroups; i++) {
2760                         overhead += ext3_bg_has_super(sb, i) +
2761                                 ext3_bg_num_gdb(sb, i);
2762                         cond_resched();
2763                 }
2764
2765                 /*
2766                  * Every block group has an inode bitmap, a block
2767                  * bitmap, and an inode table.
2768                  */
2769                 overhead += ngroups * (2 + sbi->s_itb_per_group);
2770                 sbi->s_overhead_last = overhead;
2771                 smp_wmb();
2772                 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
2773         }
2774
2775         buf->f_type = EXT3_SUPER_MAGIC;
2776         buf->f_bsize = sb->s_blocksize;
2777         buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
2778         buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
2779         buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2780         if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2781                 buf->f_bavail = 0;
2782         buf->f_files = le32_to_cpu(es->s_inodes_count);
2783         buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
2784         buf->f_namelen = EXT3_NAME_LEN;
2785         fsid = le64_to_cpup((void *)es->s_uuid) ^
2786                le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2787         buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2788         buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
2789         return 0;
2790 }
2791
2792 /* Helper function for writing quotas on sync - we need to start transaction before quota file
2793  * is locked for write. Otherwise the are possible deadlocks:
2794  * Process 1                         Process 2
2795  * ext3_create()                     quota_sync()
2796  *   journal_start()                   write_dquot()
2797  *   dquot_initialize()                       down(dqio_mutex)
2798  *     down(dqio_mutex)                    journal_start()
2799  *
2800  */
2801
2802 #ifdef CONFIG_QUOTA
2803
2804 static inline struct inode *dquot_to_inode(struct dquot *dquot)
2805 {
2806         return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2807 }
2808
2809 static int ext3_write_dquot(struct dquot *dquot)
2810 {
2811         int ret, err;
2812         handle_t *handle;
2813         struct inode *inode;
2814
2815         inode = dquot_to_inode(dquot);
2816         handle = ext3_journal_start(inode,
2817                                         EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2818         if (IS_ERR(handle))
2819                 return PTR_ERR(handle);
2820         ret = dquot_commit(dquot);
2821         err = ext3_journal_stop(handle);
2822         if (!ret)
2823                 ret = err;
2824         return ret;
2825 }
2826
2827 static int ext3_acquire_dquot(struct dquot *dquot)
2828 {
2829         int ret, err;
2830         handle_t *handle;
2831
2832         handle = ext3_journal_start(dquot_to_inode(dquot),
2833                                         EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2834         if (IS_ERR(handle))
2835                 return PTR_ERR(handle);
2836         ret = dquot_acquire(dquot);
2837         err = ext3_journal_stop(handle);
2838         if (!ret)
2839                 ret = err;
2840         return ret;
2841 }
2842
2843 static int ext3_release_dquot(struct dquot *dquot)
2844 {
2845         int ret, err;
2846         handle_t *handle;
2847
2848         handle = ext3_journal_start(dquot_to_inode(dquot),
2849                                         EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2850         if (IS_ERR(handle)) {
2851                 /* Release dquot anyway to avoid endless cycle in dqput() */
2852                 dquot_release(dquot);
2853                 return PTR_ERR(handle);
2854         }
2855         ret = dquot_release(dquot);
2856         err = ext3_journal_stop(handle);
2857         if (!ret)
2858                 ret = err;
2859         return ret;
2860 }
2861
2862 static int ext3_mark_dquot_dirty(struct dquot *dquot)
2863 {
2864         /* Are we journaling quotas? */
2865         if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2866             EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2867                 dquot_mark_dquot_dirty(dquot);
2868                 return ext3_write_dquot(dquot);
2869         } else {
2870                 return dquot_mark_dquot_dirty(dquot);
2871         }
2872 }
2873
2874 static int ext3_write_info(struct super_block *sb, int type)
2875 {
2876         int ret, err;
2877         handle_t *handle;
2878
2879         /* Data block + inode block */
2880         handle = ext3_journal_start(sb->s_root->d_inode, 2);
2881         if (IS_ERR(handle))
2882                 return PTR_ERR(handle);
2883         ret = dquot_commit_info(sb, type);
2884         err = ext3_journal_stop(handle);
2885         if (!ret)
2886                 ret = err;
2887         return ret;
2888 }
2889
2890 /*
2891  * Turn on quotas during mount time - we need to find
2892  * the quota file and such...
2893  */
2894 static int ext3_quota_on_mount(struct super_block *sb, int type)
2895 {
2896         return dquot_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2897                                         EXT3_SB(sb)->s_jquota_fmt, type);
2898 }
2899
2900 /*
2901  * Standard function to be called on quota_on
2902  */
2903 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
2904                          struct path *path)
2905 {
2906         int err;
2907
2908         if (!test_opt(sb, QUOTA))
2909                 return -EINVAL;
2910
2911         /* Quotafile not on the same filesystem? */
2912         if (path->mnt->mnt_sb != sb)
2913                 return -EXDEV;
2914         /* Journaling quota? */
2915         if (EXT3_SB(sb)->s_qf_names[type]) {
2916                 /* Quotafile not of fs root? */
2917                 if (path->dentry->d_parent != sb->s_root)
2918                         ext3_msg(sb, KERN_WARNING,
2919                                 "warning: Quota file not on filesystem root. "
2920                                 "Journaled quota will not work.");
2921         }
2922
2923         /*
2924          * When we journal data on quota file, we have to flush journal to see
2925          * all updates to the file when we bypass pagecache...
2926          */
2927         if (ext3_should_journal_data(path->dentry->d_inode)) {
2928                 /*
2929                  * We don't need to lock updates but journal_flush() could
2930                  * otherwise be livelocked...
2931                  */
2932                 journal_lock_updates(EXT3_SB(sb)->s_journal);
2933                 err = journal_flush(EXT3_SB(sb)->s_journal);
2934                 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2935                 if (err)
2936                         return err;
2937         }
2938
2939         return dquot_quota_on(sb, type, format_id, path);
2940 }
2941
2942 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2943  * acquiring the locks... As quota files are never truncated and quota code
2944  * itself serializes the operations (and no one else should touch the files)
2945  * we don't have to be afraid of races */
2946 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2947                                size_t len, loff_t off)
2948 {
2949         struct inode *inode = sb_dqopt(sb)->files[type];
2950         sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2951         int err = 0;
2952         int offset = off & (sb->s_blocksize - 1);
2953         int tocopy;
2954         size_t toread;
2955         struct buffer_head *bh;
2956         loff_t i_size = i_size_read(inode);
2957
2958         if (off > i_size)
2959                 return 0;
2960         if (off+len > i_size)
2961                 len = i_size-off;
2962         toread = len;
2963         while (toread > 0) {
2964                 tocopy = sb->s_blocksize - offset < toread ?
2965                                 sb->s_blocksize - offset : toread;
2966                 bh = ext3_bread(NULL, inode, blk, 0, &err);
2967                 if (err)
2968                         return err;
2969                 if (!bh)        /* A hole? */
2970                         memset(data, 0, tocopy);
2971                 else
2972                         memcpy(data, bh->b_data+offset, tocopy);
2973                 brelse(bh);
2974                 offset = 0;
2975                 toread -= tocopy;
2976                 data += tocopy;
2977                 blk++;
2978         }
2979         return len;
2980 }
2981
2982 /* Write to quotafile (we know the transaction is already started and has
2983  * enough credits) */
2984 static ssize_t ext3_quota_write(struct super_block *sb, int type,
2985                                 const char *data, size_t len, loff_t off)
2986 {
2987         struct inode *inode = sb_dqopt(sb)->files[type];
2988         sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2989         int err = 0;
2990         int offset = off & (sb->s_blocksize - 1);
2991         int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
2992         struct buffer_head *bh;
2993         handle_t *handle = journal_current_handle();
2994
2995         if (!handle) {
2996                 ext3_msg(sb, KERN_WARNING,
2997                         "warning: quota write (off=%llu, len=%llu)"
2998                         " cancelled because transaction is not started.",
2999                         (unsigned long long)off, (unsigned long long)len);
3000                 return -EIO;
3001         }
3002
3003         /*
3004          * Since we account only one data block in transaction credits,
3005          * then it is impossible to cross a block boundary.
3006          */
3007         if (sb->s_blocksize - offset < len) {
3008                 ext3_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
3009                         " cancelled because not block aligned",
3010                         (unsigned long long)off, (unsigned long long)len);
3011                 return -EIO;
3012         }
3013         mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
3014         bh = ext3_bread(handle, inode, blk, 1, &err);
3015         if (!bh)
3016                 goto out;
3017         if (journal_quota) {
3018                 err = ext3_journal_get_write_access(handle, bh);
3019                 if (err) {
3020                         brelse(bh);
3021                         goto out;
3022                 }
3023         }
3024         lock_buffer(bh);
3025         memcpy(bh->b_data+offset, data, len);
3026         flush_dcache_page(bh->b_page);
3027         unlock_buffer(bh);
3028         if (journal_quota)
3029                 err = ext3_journal_dirty_metadata(handle, bh);
3030         else {
3031                 /* Always do at least ordered writes for quotas */
3032                 err = ext3_journal_dirty_data(handle, bh);
3033                 mark_buffer_dirty(bh);
3034         }
3035         brelse(bh);
3036 out:
3037         if (err) {
3038                 mutex_unlock(&inode->i_mutex);
3039                 return err;
3040         }
3041         if (inode->i_size < off + len) {
3042                 i_size_write(inode, off + len);
3043                 EXT3_I(inode)->i_disksize = inode->i_size;
3044         }
3045         inode->i_version++;
3046         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
3047         ext3_mark_inode_dirty(handle, inode);
3048         mutex_unlock(&inode->i_mutex);
3049         return len;
3050 }
3051
3052 #endif
3053
3054 static struct dentry *ext3_mount(struct file_system_type *fs_type,
3055         int flags, const char *dev_name, void *data)
3056 {
3057         return mount_bdev(fs_type, flags, dev_name, data, ext3_fill_super);
3058 }
3059
3060 static struct file_system_type ext3_fs_type = {
3061         .owner          = THIS_MODULE,
3062         .name           = "ext3",
3063         .mount          = ext3_mount,
3064         .kill_sb        = kill_block_super,
3065         .fs_flags       = FS_REQUIRES_DEV,
3066 };
3067
3068 static int __init init_ext3_fs(void)
3069 {
3070         int err = init_ext3_xattr();
3071         if (err)
3072                 return err;
3073         err = init_inodecache();
3074         if (err)
3075                 goto out1;
3076         err = register_filesystem(&ext3_fs_type);
3077         if (err)
3078                 goto out;
3079         return 0;
3080 out:
3081         destroy_inodecache();
3082 out1:
3083         exit_ext3_xattr();
3084         return err;
3085 }
3086
3087 static void __exit exit_ext3_fs(void)
3088 {
3089         unregister_filesystem(&ext3_fs_type);
3090         destroy_inodecache();
3091         exit_ext3_xattr();
3092 }
3093
3094 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
3095 MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
3096 MODULE_LICENSE("GPL");
3097 module_init(init_ext3_fs)
3098 module_exit(exit_ext3_fs)