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