fs/ext3/super.c

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