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 "%s: aborting transaction: %s in %s\n",
 139                caller, errstr, err_fn);
 140
 141         journal_abort_handle(handle);
 142 }
 143
 144 /* Deal with the reporting of failure conditions on a filesystem such as
 145  * inconsistencies detected or read IO failures.
 146  *
 147  * On ext2, we can store the error state of the filesystem in the
 148  * superblock.  That is not possible on ext3, because we may have other
 149  * write ordering constraints on the superblock which prevent us from
 150  * writing it out straight away; and given that the journal is about to
 151  * be aborted, we can't rely on the current, or future, transactions to
 152  * write out the superblock safely.
 153  *
 154  * We'll just use the journal_abort() error code to record an error in
 155  * the journal instead.  On recovery, the journal will compain about
 156  * that error until we've noted it down and cleared it.
 157  */
 158
 159 static void ext3_handle_error(struct super_block *sb)
 160 {
 161         struct ext3_super_block *es = EXT3_SB(sb)->s_es;
 162
 163         EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
 164         es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
 165
 166         if (sb->s_flags & MS_RDONLY)
 167                 return;
 168
 169         if (!test_opt (sb, ERRORS_CONT)) {
 170                 journal_t *journal = EXT3_SB(sb)->s_journal;
 171
 172                 EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
 173                 if (journal)
 174                         journal_abort(journal, -EIO);
 175         }
 176         if (test_opt (sb, ERRORS_RO)) {
 177                 printk (KERN_CRIT "Remounting filesystem read-only\n");
 178                 sb->s_flags |= MS_RDONLY;
 179         }
 180         ext3_commit_super(sb, es, 1);
 181         if (test_opt(sb, ERRORS_PANIC))
 182                 panic("EXT3-fs (device %s): panic forced after error\n",
 183                         sb->s_id);
 184 }
 185
 186 void ext3_error (struct super_block * sb, const char * function,
 187                  const char * fmt, ...)
 188 {
 189         va_list args;
 190
 191         va_start(args, fmt);
 192         printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
 193         vprintk(fmt, args);
 194         printk("\n");
 195         va_end(args);
 196
 197         ext3_handle_error(sb);
 198 }
 199
 200 static const char *ext3_decode_error(struct super_block * sb, int errno,
 201                                      char nbuf[16])
 202 {
 203         char *errstr = NULL;
 204
 205         switch (errno) {
 206         case -EIO:
 207                 errstr = "IO failure";
 208                 break;
 209         case -ENOMEM:
 210                 errstr = "Out of memory";
 211                 break;
 212         case -EROFS:
 213                 if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT)
 214                         errstr = "Journal has aborted";
 215                 else
 216                         errstr = "Readonly filesystem";
 217                 break;
 218         default:
 219                 /* If the caller passed in an extra buffer for unknown
 220                  * errors, textualise them now.  Else we just return
 221                  * NULL. */
 222                 if (nbuf) {
 223                         /* Check for truncated error codes... */
 224                         if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
 225                                 errstr = nbuf;
 226                 }
 227                 break;
 228         }
 229
 230         return errstr;
 231 }
 232
 233 /* __ext3_std_error decodes expected errors from journaling functions
 234  * automatically and invokes the appropriate error response.  */
 235
 236 void __ext3_std_error (struct super_block * sb, const char * function,
 237                        int errno)
 238 {
 239         char nbuf[16];
 240         const char *errstr;
 241
 242         /* Special case: if the error is EROFS, and we're not already
 243          * inside a transaction, then there's really no point in logging
 244          * an error. */
 245         if (errno == -EROFS && journal_current_handle() == NULL &&
 246             (sb->s_flags & MS_RDONLY))
 247                 return;
 248
 249         errstr = ext3_decode_error(sb, errno, nbuf);
 250         printk (KERN_CRIT "EXT3-fs error (device %s) in %s: %s\n",
 251                 sb->s_id, function, errstr);
 252
 253         ext3_handle_error(sb);
 254 }
 255
 256 /*
 257  * ext3_abort is a much stronger failure handler than ext3_error.  The
 258  * abort function may be used to deal with unrecoverable failures such
 259  * as journal IO errors or ENOMEM at a critical moment in log management.
 260  *
 261  * We unconditionally force the filesystem into an ABORT|READONLY state,
 262  * unless the error response on the fs has been set to panic in which
 263  * case we take the easy way out and panic immediately.
 264  */
 265
 266 void ext3_abort (struct super_block * sb, const char * function,
 267                  const char * fmt, ...)
 268 {
 269         va_list args;
 270
 271         printk (KERN_CRIT "ext3_abort called.\n");
 272
 273         va_start(args, fmt);
 274         printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
 275         vprintk(fmt, args);
 276         printk("\n");
 277         va_end(args);
 278
 279         if (test_opt(sb, ERRORS_PANIC))
 280                 panic("EXT3-fs panic from previous error\n");
 281
 282         if (sb->s_flags & MS_RDONLY)
 283                 return;
 284
 285         printk(KERN_CRIT "Remounting filesystem read-only\n");
 286         EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
 287         sb->s_flags |= MS_RDONLY;
 288         EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
 289         if (EXT3_SB(sb)->s_journal)
 290                 journal_abort(EXT3_SB(sb)->s_journal, -EIO);
 291 }
 292
 293 void ext3_warning (struct super_block * sb, const char * function,
 294                    const char * fmt, ...)
 295 {
 296         va_list args;
 297
 298         va_start(args, fmt);
 299         printk(KERN_WARNING "EXT3-fs warning (device %s): %s: ",
 300                sb->s_id, function);
 301         vprintk(fmt, args);
 302         printk("\n");
 303         va_end(args);
 304 }
 305
 306 void ext3_update_dynamic_rev(struct super_block *sb)
 307 {
 308         struct ext3_super_block *es = EXT3_SB(sb)->s_es;
 309
 310         if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
 311                 return;
 312
 313         ext3_warning(sb, __func__,
 314                      "updating to rev %d because of new feature flag, "
 315                      "running e2fsck is recommended",
 316                      EXT3_DYNAMIC_REV);
 317
 318         es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO);
 319         es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE);
 320         es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV);
 321         /* leave es->s_feature_*compat flags alone */
 322         /* es->s_uuid will be set by e2fsck if empty */
 323
 324         /*
 325          * The rest of the superblock fields should be zero, and if not it
 326          * means they are likely already in use, so leave them alone.  We
 327          * can leave it up to e2fsck to clean up any inconsistencies there.
 328          */
 329 }
 330
 331 /*
 332  * Open the external journal device
 333  */
 334 static struct block_device *ext3_blkdev_get(dev_t dev)
 335 {
 336         struct block_device *bdev;
 337         char b[BDEVNAME_SIZE];
 338
 339         bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
 340         if (IS_ERR(bdev))
 341                 goto fail;
 342         return bdev;
 343
 344 fail:
 345         printk(KERN_ERR "EXT3: failed to open journal device %s: %ld\n",
 346                         __bdevname(dev, b), PTR_ERR(bdev));
 347         return NULL;
 348 }
 349
 350 /*
 351  * Release the journal device
 352  */
 353 static int ext3_blkdev_put(struct block_device *bdev)
 354 {
 355         bd_release(bdev);
 356         return blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
 357 }
 358
 359 static int ext3_blkdev_remove(struct ext3_sb_info *sbi)
 360 {
 361         struct block_device *bdev;
 362         int ret = -ENODEV;
 363
 364         bdev = sbi->journal_bdev;
 365         if (bdev) {
 366                 ret = ext3_blkdev_put(bdev);
 367                 sbi->journal_bdev = NULL;
 368         }
 369         return ret;
 370 }
 371
 372 static inline struct inode *orphan_list_entry(struct list_head *l)
 373 {
 374         return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
 375 }
 376
 377 static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
 378 {
 379         struct list_head *l;
 380
 381         printk(KERN_ERR "sb orphan head is %d\n",
 382                le32_to_cpu(sbi->s_es->s_last_orphan));
 383
 384         printk(KERN_ERR "sb_info orphan list:\n");
 385         list_for_each(l, &sbi->s_orphan) {
 386                 struct inode *inode = orphan_list_entry(l);
 387                 printk(KERN_ERR "  "
 388                        "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
 389                        inode->i_sb->s_id, inode->i_ino, inode,
 390                        inode->i_mode, inode->i_nlink,
 391                        NEXT_ORPHAN(inode));
 392         }
 393 }
 394
 395 static void ext3_put_super (struct super_block * sb)
 396 {
 397         struct ext3_sb_info *sbi = EXT3_SB(sb);
 398         struct ext3_super_block *es = sbi->s_es;
 399         int i, err;
 400
 401         lock_kernel();
 402
 403         ext3_xattr_put_super(sb);
 404         err = journal_destroy(sbi->s_journal);
 405         sbi->s_journal = NULL;
 406         if (err < 0)
 407                 ext3_abort(sb, __func__, "Couldn't clean up the journal");
 408
 409         if (!(sb->s_flags & MS_RDONLY)) {
 410                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
 411                 es->s_state = cpu_to_le16(sbi->s_mount_state);
 412                 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
 413                 mark_buffer_dirty(sbi->s_sbh);
 414                 ext3_commit_super(sb, es, 1);
 415         }
 416
 417         for (i = 0; i < sbi->s_gdb_count; i++)
 418                 brelse(sbi->s_group_desc[i]);
 419         kfree(sbi->s_group_desc);
 420         percpu_counter_destroy(&sbi->s_freeblocks_counter);
 421         percpu_counter_destroy(&sbi->s_freeinodes_counter);
 422         percpu_counter_destroy(&sbi->s_dirs_counter);
 423         brelse(sbi->s_sbh);
 424 #ifdef CONFIG_QUOTA
 425         for (i = 0; i < MAXQUOTAS; i++)
 426                 kfree(sbi->s_qf_names[i]);
 427 #endif
 428
 429         /* Debugging code just in case the in-memory inode orphan list
 430          * isn't empty.  The on-disk one can be non-empty if we've
 431          * detected an error and taken the fs readonly, but the
 432          * in-memory list had better be clean by this point. */
 433         if (!list_empty(&sbi->s_orphan))
 434                 dump_orphan_list(sb, sbi);
 435         J_ASSERT(list_empty(&sbi->s_orphan));
 436
 437         invalidate_bdev(sb->s_bdev);
 438         if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
 439                 /*
 440                  * Invalidate the journal device's buffers.  We don't want them
 441                  * floating about in memory - the physical journal device may
 442                  * hotswapped, and it breaks the `ro-after' testing code.
 443                  */
 444                 sync_blockdev(sbi->journal_bdev);
 445                 invalidate_bdev(sbi->journal_bdev);
 446                 ext3_blkdev_remove(sbi);
 447         }
 448         sb->s_fs_info = NULL;
 449         kfree(sbi->s_blockgroup_lock);
 450         kfree(sbi);
 451
 452         unlock_kernel();
 453 }
 454
 455 static struct kmem_cache *ext3_inode_cachep;
 456
 457 /*
 458  * Called inside transaction, so use GFP_NOFS
 459  */
 460 static struct inode *ext3_alloc_inode(struct super_block *sb)
 461 {
 462         struct ext3_inode_info *ei;
 463
 464         ei = kmem_cache_alloc(ext3_inode_cachep, GFP_NOFS);
 465         if (!ei)
 466                 return NULL;
 467         ei->i_block_alloc_info = NULL;
 468         ei->vfs_inode.i_version = 1;
 469         atomic_set(&ei->i_datasync_tid, 0);
 470         atomic_set(&ei->i_sync_tid, 0);
 471         return &ei->vfs_inode;
 472 }
 473
 474 static void ext3_destroy_inode(struct inode *inode)
 475 {
 476         if (!list_empty(&(EXT3_I(inode)->i_orphan))) {
 477                 printk("EXT3 Inode %p: orphan list check failed!\n",
 478                         EXT3_I(inode));
 479                 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
 480                                 EXT3_I(inode), sizeof(struct ext3_inode_info),
 481                                 false);
 482                 dump_stack();
 483         }
 484         kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
 485 }
 486
 487 static void init_once(void *foo)
 488 {
 489         struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
 490
 491         INIT_LIST_HEAD(&ei->i_orphan);
 492 #ifdef CONFIG_EXT3_FS_XATTR
 493         init_rwsem(&ei->xattr_sem);
 494 #endif
 495         mutex_init(&ei->truncate_mutex);
 496         inode_init_once(&ei->vfs_inode);
 497 }
 498
 499 static int init_inodecache(void)
 500 {
 501         ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
 502                                              sizeof(struct ext3_inode_info),
 503                                              0, (SLAB_RECLAIM_ACCOUNT|
 504                                                 SLAB_MEM_SPREAD),
 505                                              init_once);
 506         if (ext3_inode_cachep == NULL)
 507                 return -ENOMEM;
 508         return 0;
 509 }
 510
 511 static void destroy_inodecache(void)
 512 {
 513         kmem_cache_destroy(ext3_inode_cachep);
 514 }
 515
 516 static void ext3_clear_inode(struct inode *inode)
 517 {
 518         struct ext3_block_alloc_info *rsv = EXT3_I(inode)->i_block_alloc_info;
 519         ext3_discard_reservation(inode);
 520         EXT3_I(inode)->i_block_alloc_info = NULL;
 521         if (unlikely(rsv))
 522                 kfree(rsv);
 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                 seq_printf(seq, ",jqfmt=%s",
 532                 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0");
 533
 534         if (sbi->s_qf_names[USRQUOTA])
 535                 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
 536
 537         if (sbi->s_qf_names[GRPQUOTA])
 538                 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
 539
 540         if (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA)
 541                 seq_puts(seq, ",usrquota");
 542
 543         if (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)
 544                 seq_puts(seq, ",grpquota");
 545 #endif
 546 }
 547
 548 static char *data_mode_string(unsigned long mode)
 549 {
 550         switch (mode) {
 551         case EXT3_MOUNT_JOURNAL_DATA:
 552                 return "journal";
 553         case EXT3_MOUNT_ORDERED_DATA:
 554                 return "ordered";
 555         case EXT3_MOUNT_WRITEBACK_DATA:
 556                 return "writeback";
 557         }
 558         return "unknown";
 559 }
 560
 561 /*
 562  * Show an option if
 563  *  - it's set to a non-default value OR
 564  *  - if the per-sb default is different from the global default
 565  */
 566 static int ext3_show_options(struct seq_file *seq, struct vfsmount *vfs)
 567 {
 568         struct super_block *sb = vfs->mnt_sb;
 569         struct ext3_sb_info *sbi = EXT3_SB(sb);
 570         struct ext3_super_block *es = sbi->s_es;
 571         unsigned long def_mount_opts;
 572
 573         def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
 574
 575         if (sbi->s_sb_block != 1)
 576                 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
 577         if (test_opt(sb, MINIX_DF))
 578                 seq_puts(seq, ",minixdf");
 579         if (test_opt(sb, GRPID))
 580                 seq_puts(seq, ",grpid");
 581         if (!test_opt(sb, GRPID) && (def_mount_opts & EXT3_DEFM_BSDGROUPS))
 582                 seq_puts(seq, ",nogrpid");
 583         if (sbi->s_resuid != EXT3_DEF_RESUID ||
 584             le16_to_cpu(es->s_def_resuid) != EXT3_DEF_RESUID) {
 585                 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
 586         }
 587         if (sbi->s_resgid != EXT3_DEF_RESGID ||
 588             le16_to_cpu(es->s_def_resgid) != EXT3_DEF_RESGID) {
 589                 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
 590         }
 591         if (test_opt(sb, ERRORS_RO)) {
 592                 int def_errors = le16_to_cpu(es->s_errors);
 593
 594                 if (def_errors == EXT3_ERRORS_PANIC ||
 595                     def_errors == EXT3_ERRORS_CONTINUE) {
 596                         seq_puts(seq, ",errors=remount-ro");
 597                 }
 598         }
 599         if (test_opt(sb, ERRORS_CONT))
 600                 seq_puts(seq, ",errors=continue");
 601         if (test_opt(sb, ERRORS_PANIC))
 602                 seq_puts(seq, ",errors=panic");
 603         if (test_opt(sb, NO_UID32))
 604                 seq_puts(seq, ",nouid32");
 605         if (test_opt(sb, DEBUG))
 606                 seq_puts(seq, ",debug");
 607         if (test_opt(sb, OLDALLOC))
 608                 seq_puts(seq, ",oldalloc");
 609 #ifdef CONFIG_EXT3_FS_XATTR
 610         if (test_opt(sb, XATTR_USER))
 611                 seq_puts(seq, ",user_xattr");
 612         if (!test_opt(sb, XATTR_USER) &&
 613             (def_mount_opts & EXT3_DEFM_XATTR_USER)) {
 614                 seq_puts(seq, ",nouser_xattr");
 615         }
 616 #endif
 617 #ifdef CONFIG_EXT3_FS_POSIX_ACL
 618         if (test_opt(sb, POSIX_ACL))
 619                 seq_puts(seq, ",acl");
 620         if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT3_DEFM_ACL))
 621                 seq_puts(seq, ",noacl");
 622 #endif
 623         if (!test_opt(sb, RESERVATION))
 624                 seq_puts(seq, ",noreservation");
 625         if (sbi->s_commit_interval) {
 626                 seq_printf(seq, ",commit=%u",
 627                            (unsigned) (sbi->s_commit_interval / HZ));
 628         }
 629         if (test_opt(sb, BARRIER))
 630                 seq_puts(seq, ",barrier=1");
 631         if (test_opt(sb, NOBH))
 632                 seq_puts(seq, ",nobh");
 633
 634         seq_printf(seq, ",data=%s", data_mode_string(sbi->s_mount_opt &
 635                                                      EXT3_MOUNT_DATA_FLAGS));
 636         if (test_opt(sb, DATA_ERR_ABORT))
 637                 seq_puts(seq, ",data_err=abort");
 638
 639         ext3_show_quota_options(seq, sb);
 640
 641         return 0;
 642 }
 643
 644
 645 static struct inode *ext3_nfs_get_inode(struct super_block *sb,
 646                 u64 ino, u32 generation)
 647 {
 648         struct inode *inode;
 649
 650         if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO)
 651                 return ERR_PTR(-ESTALE);
 652         if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count))
 653                 return ERR_PTR(-ESTALE);
 654
 655         /* iget isn't really right if the inode is currently unallocated!!
 656          *
 657          * ext3_read_inode will return a bad_inode if the inode had been
 658          * deleted, so we should be safe.
 659          *
 660          * Currently we don't know the generation for parent directory, so
 661          * a generation of 0 means "accept any"
 662          */
 663         inode = ext3_iget(sb, ino);
 664         if (IS_ERR(inode))
 665                 return ERR_CAST(inode);
 666         if (generation && inode->i_generation != generation) {
 667                 iput(inode);
 668                 return ERR_PTR(-ESTALE);
 669         }
 670
 671         return inode;
 672 }
 673
 674 static struct dentry *ext3_fh_to_dentry(struct super_block *sb, struct fid *fid,
 675                 int fh_len, int fh_type)
 676 {
 677         return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
 678                                     ext3_nfs_get_inode);
 679 }
 680
 681 static struct dentry *ext3_fh_to_parent(struct super_block *sb, struct fid *fid,
 682                 int fh_len, int fh_type)
 683 {
 684         return generic_fh_to_parent(sb, fid, fh_len, fh_type,
 685                                     ext3_nfs_get_inode);
 686 }
 687
 688 /*
 689  * Try to release metadata pages (indirect blocks, directories) which are
 690  * mapped via the block device.  Since these pages could have journal heads
 691  * which would prevent try_to_free_buffers() from freeing them, we must use
 692  * jbd layer's try_to_free_buffers() function to release them.
 693  */
 694 static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
 695                                  gfp_t wait)
 696 {
 697         journal_t *journal = EXT3_SB(sb)->s_journal;
 698
 699         WARN_ON(PageChecked(page));
 700         if (!page_has_buffers(page))
 701                 return 0;
 702         if (journal)
 703                 return journal_try_to_free_buffers(journal, page,
 704                                                    wait & ~__GFP_WAIT);
 705         return try_to_free_buffers(page);
 706 }
 707
 708 #ifdef CONFIG_QUOTA
 709 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
 710 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
 711
 712 static int ext3_write_dquot(struct dquot *dquot);
 713 static int ext3_acquire_dquot(struct dquot *dquot);
 714 static int ext3_release_dquot(struct dquot *dquot);
 715 static int ext3_mark_dquot_dirty(struct dquot *dquot);
 716 static int ext3_write_info(struct super_block *sb, int type);
 717 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
 718                                 char *path, int remount);
 719 static int ext3_quota_on_mount(struct super_block *sb, int type);
 720 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
 721                                size_t len, loff_t off);
 722 static ssize_t ext3_quota_write(struct super_block *sb, int type,
 723                                 const char *data, size_t len, loff_t off);
 724
 725 static const struct dquot_operations ext3_quota_operations = {
 726         .initialize     = dquot_initialize,
 727         .drop           = dquot_drop,
 728         .alloc_space    = dquot_alloc_space,
 729         .alloc_inode    = dquot_alloc_inode,
 730         .free_space     = dquot_free_space,
 731         .free_inode     = dquot_free_inode,
 732         .transfer       = dquot_transfer,
 733         .write_dquot    = ext3_write_dquot,
 734         .acquire_dquot  = ext3_acquire_dquot,
 735         .release_dquot  = ext3_release_dquot,
 736         .mark_dirty     = ext3_mark_dquot_dirty,
 737         .write_info     = ext3_write_info,
 738         .alloc_dquot    = dquot_alloc,
 739         .destroy_dquot  = dquot_destroy,
 740 };
 741
 742 static const struct quotactl_ops ext3_qctl_operations = {
 743         .quota_on       = ext3_quota_on,
 744         .quota_off      = vfs_quota_off,
 745         .quota_sync     = vfs_quota_sync,
 746         .get_info       = vfs_get_dqinfo,
 747         .set_info       = vfs_set_dqinfo,
 748         .get_dqblk      = vfs_get_dqblk,
 749         .set_dqblk      = vfs_set_dqblk
 750 };
 751 #endif
 752
 753 static const struct super_operations ext3_sops = {
 754         .alloc_inode    = ext3_alloc_inode,
 755         .destroy_inode  = ext3_destroy_inode,
 756         .write_inode    = ext3_write_inode,
 757         .dirty_inode    = ext3_dirty_inode,
 758         .delete_inode   = ext3_delete_inode,
 759         .put_super      = ext3_put_super,
 760         .sync_fs        = ext3_sync_fs,
 761         .freeze_fs      = ext3_freeze,
 762         .unfreeze_fs    = ext3_unfreeze,
 763         .statfs         = ext3_statfs,
 764         .remount_fs     = ext3_remount,
 765         .clear_inode    = ext3_clear_inode,
 766         .show_options   = ext3_show_options,
 767 #ifdef CONFIG_QUOTA
 768         .quota_read     = ext3_quota_read,
 769         .quota_write    = ext3_quota_write,
 770 #endif
 771         .bdev_try_to_free_page = bdev_try_to_free_page,
 772 };
 773
 774 static const struct export_operations ext3_export_ops = {
 775         .fh_to_dentry = ext3_fh_to_dentry,
 776         .fh_to_parent = ext3_fh_to_parent,
 777         .get_parent = ext3_get_parent,
 778 };
 779
 780 enum {
 781         Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
 782         Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
 783         Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
 784         Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
 785         Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
 786         Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
 787         Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
 788         Opt_data_err_abort, Opt_data_err_ignore,
 789         Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
 790         Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
 791         Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
 792         Opt_grpquota
 793 };
 794
 795 static const match_table_t tokens = {
 796         {Opt_bsd_df, "bsddf"},
 797         {Opt_minix_df, "minixdf"},
 798         {Opt_grpid, "grpid"},
 799         {Opt_grpid, "bsdgroups"},
 800         {Opt_nogrpid, "nogrpid"},
 801         {Opt_nogrpid, "sysvgroups"},
 802         {Opt_resgid, "resgid=%u"},
 803         {Opt_resuid, "resuid=%u"},
 804         {Opt_sb, "sb=%u"},
 805         {Opt_err_cont, "errors=continue"},
 806         {Opt_err_panic, "errors=panic"},
 807         {Opt_err_ro, "errors=remount-ro"},
 808         {Opt_nouid32, "nouid32"},
 809         {Opt_nocheck, "nocheck"},
 810         {Opt_nocheck, "check=none"},
 811         {Opt_debug, "debug"},
 812         {Opt_oldalloc, "oldalloc"},
 813         {Opt_orlov, "orlov"},
 814         {Opt_user_xattr, "user_xattr"},
 815         {Opt_nouser_xattr, "nouser_xattr"},
 816         {Opt_acl, "acl"},
 817         {Opt_noacl, "noacl"},
 818         {Opt_reservation, "reservation"},
 819         {Opt_noreservation, "noreservation"},
 820         {Opt_noload, "noload"},
 821         {Opt_nobh, "nobh"},
 822         {Opt_bh, "bh"},
 823         {Opt_commit, "commit=%u"},
 824         {Opt_journal_update, "journal=update"},
 825         {Opt_journal_inum, "journal=%u"},
 826         {Opt_journal_dev, "journal_dev=%u"},
 827         {Opt_abort, "abort"},
 828         {Opt_data_journal, "data=journal"},
 829         {Opt_data_ordered, "data=ordered"},
 830         {Opt_data_writeback, "data=writeback"},
 831         {Opt_data_err_abort, "data_err=abort"},
 832         {Opt_data_err_ignore, "data_err=ignore"},
 833         {Opt_offusrjquota, "usrjquota="},
 834         {Opt_usrjquota, "usrjquota=%s"},
 835         {Opt_offgrpjquota, "grpjquota="},
 836         {Opt_grpjquota, "grpjquota=%s"},
 837         {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
 838         {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
 839         {Opt_grpquota, "grpquota"},
 840         {Opt_noquota, "noquota"},
 841         {Opt_quota, "quota"},
 842         {Opt_usrquota, "usrquota"},
 843         {Opt_barrier, "barrier=%u"},
 844         {Opt_resize, "resize"},
 845         {Opt_err, NULL},
 846 };
 847
 848 static ext3_fsblk_t get_sb_block(void **data)
 849 {
 850         ext3_fsblk_t    sb_block;
 851         char            *options = (char *) *data;
 852
 853         if (!options || strncmp(options, "sb=", 3) != 0)
 854                 return 1;       /* Default location */
 855         options += 3;
 856         /*todo: use simple_strtoll with >32bit ext3 */
 857         sb_block = simple_strtoul(options, &options, 0);
 858         if (*options && *options != ',') {
 859                 printk("EXT3-fs: Invalid sb specification: %s\n",
 860                        (char *) *data);
 861                 return 1;
 862         }
 863         if (*options == ',')
 864                 options++;
 865         *data = (void *) options;
 866         return sb_block;
 867 }
 868
 869 static int parse_options (char *options, struct super_block *sb,
 870                           unsigned int *inum, unsigned long *journal_devnum,
 871                           ext3_fsblk_t *n_blocks_count, int is_remount)
 872 {
 873         struct ext3_sb_info *sbi = EXT3_SB(sb);
 874         char * p;
 875         substring_t args[MAX_OPT_ARGS];
 876         int data_opt = 0;
 877         int option;
 878 #ifdef CONFIG_QUOTA
 879         int qtype, qfmt;
 880         char *qname;
 881 #endif
 882
 883         if (!options)
 884                 return 1;
 885
 886         while ((p = strsep (&options, ",")) != NULL) {
 887                 int token;
 888                 if (!*p)
 889                         continue;
 890
 891                 token = match_token(p, tokens, args);
 892                 switch (token) {
 893                 case Opt_bsd_df:
 894                         clear_opt (sbi->s_mount_opt, MINIX_DF);
 895                         break;
 896                 case Opt_minix_df:
 897                         set_opt (sbi->s_mount_opt, MINIX_DF);
 898                         break;
 899                 case Opt_grpid:
 900                         set_opt (sbi->s_mount_opt, GRPID);
 901                         break;
 902                 case Opt_nogrpid:
 903                         clear_opt (sbi->s_mount_opt, GRPID);
 904                         break;
 905                 case Opt_resuid:
 906                         if (match_int(&args[0], &option))
 907                                 return 0;
 908                         sbi->s_resuid = option;
 909                         break;
 910                 case Opt_resgid:
 911                         if (match_int(&args[0], &option))
 912                                 return 0;
 913                         sbi->s_resgid = option;
 914                         break;
 915                 case Opt_sb:
 916                         /* handled by get_sb_block() instead of here */
 917                         /* *sb_block = match_int(&args[0]); */
 918                         break;
 919                 case Opt_err_panic:
 920                         clear_opt (sbi->s_mount_opt, ERRORS_CONT);
 921                         clear_opt (sbi->s_mount_opt, ERRORS_RO);
 922                         set_opt (sbi->s_mount_opt, ERRORS_PANIC);
 923                         break;
 924                 case Opt_err_ro:
 925                         clear_opt (sbi->s_mount_opt, ERRORS_CONT);
 926                         clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
 927                         set_opt (sbi->s_mount_opt, ERRORS_RO);
 928                         break;
 929                 case Opt_err_cont:
 930                         clear_opt (sbi->s_mount_opt, ERRORS_RO);
 931                         clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
 932                         set_opt (sbi->s_mount_opt, ERRORS_CONT);
 933                         break;
 934                 case Opt_nouid32:
 935                         set_opt (sbi->s_mount_opt, NO_UID32);
 936                         break;
 937                 case Opt_nocheck:
 938                         clear_opt (sbi->s_mount_opt, CHECK);
 939                         break;
 940                 case Opt_debug:
 941                         set_opt (sbi->s_mount_opt, DEBUG);
 942                         break;
 943                 case Opt_oldalloc:
 944                         set_opt (sbi->s_mount_opt, OLDALLOC);
 945                         break;
 946                 case Opt_orlov:
 947                         clear_opt (sbi->s_mount_opt, OLDALLOC);
 948                         break;
 949 #ifdef CONFIG_EXT3_FS_XATTR
 950                 case Opt_user_xattr:
 951                         set_opt (sbi->s_mount_opt, XATTR_USER);
 952                         break;
 953                 case Opt_nouser_xattr:
 954                         clear_opt (sbi->s_mount_opt, XATTR_USER);
 955                         break;
 956 #else
 957                 case Opt_user_xattr:
 958                 case Opt_nouser_xattr:
 959                         printk("EXT3 (no)user_xattr options not supported\n");
 960                         break;
 961 #endif
 962 #ifdef CONFIG_EXT3_FS_POSIX_ACL
 963                 case Opt_acl:
 964                         set_opt(sbi->s_mount_opt, POSIX_ACL);
 965                         break;
 966                 case Opt_noacl:
 967                         clear_opt(sbi->s_mount_opt, POSIX_ACL);
 968                         break;
 969 #else
 970                 case Opt_acl:
 971                 case Opt_noacl:
 972                         printk("EXT3 (no)acl options not supported\n");
 973                         break;
 974 #endif
 975                 case Opt_reservation:
 976                         set_opt(sbi->s_mount_opt, RESERVATION);
 977                         break;
 978                 case Opt_noreservation:
 979                         clear_opt(sbi->s_mount_opt, RESERVATION);
 980                         break;
 981                 case Opt_journal_update:
 982                         /* @@@ FIXME */
 983                         /* Eventually we will want to be able to create
 984                            a journal file here.  For now, only allow the
 985                            user to specify an existing inode to be the
 986                            journal file. */
 987                         if (is_remount) {
 988                                 printk(KERN_ERR "EXT3-fs: cannot specify "
 989                                        "journal on remount\n");
 990                                 return 0;
 991                         }
 992                         set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
 993                         break;
 994                 case Opt_journal_inum:
 995                         if (is_remount) {
 996                                 printk(KERN_ERR "EXT3-fs: cannot specify "
 997                                        "journal on remount\n");
 998                                 return 0;
 999                         }
1000                         if (match_int(&args[0], &option))
1001                                 return 0;
1002                         *inum = option;
1003                         break;
1004                 case Opt_journal_dev:
1005                         if (is_remount) {
1006                                 printk(KERN_ERR "EXT3-fs: cannot specify "
1007                                        "journal on remount\n");
1008                                 return 0;
1009                         }
1010                         if (match_int(&args[0], &option))
1011                                 return 0;
1012                         *journal_devnum = option;
1013                         break;
1014                 case Opt_noload:
1015                         set_opt (sbi->s_mount_opt, NOLOAD);
1016                         break;
1017                 case Opt_commit:
1018                         if (match_int(&args[0], &option))
1019                                 return 0;
1020                         if (option < 0)
1021                                 return 0;
1022                         if (option == 0)
1023                                 option = JBD_DEFAULT_MAX_COMMIT_AGE;
1024                         sbi->s_commit_interval = HZ * option;
1025                         break;
1026                 case Opt_data_journal:
1027                         data_opt = EXT3_MOUNT_JOURNAL_DATA;
1028                         goto datacheck;
1029                 case Opt_data_ordered:
1030                         data_opt = EXT3_MOUNT_ORDERED_DATA;
1031                         goto datacheck;
1032                 case Opt_data_writeback:
1033                         data_opt = EXT3_MOUNT_WRITEBACK_DATA;
1034                 datacheck:
1035                         if (is_remount) {
1036                                 if ((sbi->s_mount_opt & EXT3_MOUNT_DATA_FLAGS)
1037                                                 == data_opt)
1038                                         break;
1039                                 printk(KERN_ERR
1040                                         "EXT3-fs (device %s): Cannot change "
1041                                         "data mode on remount. The filesystem "
1042                                         "is mounted in data=%s mode and you "
1043                                         "try to remount it in data=%s mode.\n",
1044                                         sb->s_id,
1045                                         data_mode_string(sbi->s_mount_opt &
1046                                                         EXT3_MOUNT_DATA_FLAGS),
1047                                         data_mode_string(data_opt));
1048                                 return 0;
1049                         } else {
1050                                 sbi->s_mount_opt &= ~EXT3_MOUNT_DATA_FLAGS;
1051                                 sbi->s_mount_opt |= data_opt;
1052                         }
1053                         break;
1054                 case Opt_data_err_abort:
1055                         set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1056                         break;
1057                 case Opt_data_err_ignore:
1058                         clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1059                         break;
1060 #ifdef CONFIG_QUOTA
1061                 case Opt_usrjquota:
1062                         qtype = USRQUOTA;
1063                         goto set_qf_name;
1064                 case Opt_grpjquota:
1065                         qtype = GRPQUOTA;
1066 set_qf_name:
1067                         if (sb_any_quota_loaded(sb) &&
1068                             !sbi->s_qf_names[qtype]) {
1069                                 printk(KERN_ERR
1070                                         "EXT3-fs: Cannot change journaled "
1071                                         "quota options when quota turned on.\n");
1072                                 return 0;
1073                         }
1074                         qname = match_strdup(&args[0]);
1075                         if (!qname) {
1076                                 printk(KERN_ERR
1077                                         "EXT3-fs: not enough memory for "
1078                                         "storing quotafile name.\n");
1079                                 return 0;
1080                         }
1081                         if (sbi->s_qf_names[qtype] &&
1082                             strcmp(sbi->s_qf_names[qtype], qname)) {
1083                                 printk(KERN_ERR
1084                                         "EXT3-fs: %s quota file already "
1085                                         "specified.\n", QTYPE2NAME(qtype));
1086                                 kfree(qname);
1087                                 return 0;
1088                         }
1089                         sbi->s_qf_names[qtype] = qname;
1090                         if (strchr(sbi->s_qf_names[qtype], '/')) {
1091                                 printk(KERN_ERR
1092                                         "EXT3-fs: quotafile must be on "
1093                                         "filesystem root.\n");
1094                                 kfree(sbi->s_qf_names[qtype]);
1095                                 sbi->s_qf_names[qtype] = NULL;
1096                                 return 0;
1097                         }
1098                         set_opt(sbi->s_mount_opt, QUOTA);
1099                         break;
1100                 case Opt_offusrjquota:
1101                         qtype = USRQUOTA;
1102                         goto clear_qf_name;
1103                 case Opt_offgrpjquota:
1104                         qtype = GRPQUOTA;
1105 clear_qf_name:
1106                         if (sb_any_quota_loaded(sb) &&
1107                             sbi->s_qf_names[qtype]) {
1108                                 printk(KERN_ERR "EXT3-fs: Cannot change "
1109                                         "journaled quota options when "
1110                                         "quota turned on.\n");
1111                                 return 0;
1112                         }
1113                         /*
1114                          * The space will be released later when all options
1115                          * are confirmed to be correct
1116                          */
1117                         sbi->s_qf_names[qtype] = NULL;
1118                         break;
1119                 case Opt_jqfmt_vfsold:
1120                         qfmt = QFMT_VFS_OLD;
1121                         goto set_qf_format;
1122                 case Opt_jqfmt_vfsv0:
1123                         qfmt = QFMT_VFS_V0;
1124 set_qf_format:
1125                         if (sb_any_quota_loaded(sb) &&
1126                             sbi->s_jquota_fmt != qfmt) {
1127                                 printk(KERN_ERR "EXT3-fs: Cannot change "
1128                                         "journaled quota options when "
1129                                         "quota turned on.\n");
1130                                 return 0;
1131                         }
1132                         sbi->s_jquota_fmt = qfmt;
1133                         break;
1134                 case Opt_quota:
1135                 case Opt_usrquota:
1136                         set_opt(sbi->s_mount_opt, QUOTA);
1137                         set_opt(sbi->s_mount_opt, USRQUOTA);
1138                         break;
1139                 case Opt_grpquota:
1140                         set_opt(sbi->s_mount_opt, QUOTA);
1141                         set_opt(sbi->s_mount_opt, GRPQUOTA);
1142                         break;
1143                 case Opt_noquota:
1144                         if (sb_any_quota_loaded(sb)) {
1145                                 printk(KERN_ERR "EXT3-fs: Cannot change quota "
1146                                         "options when quota turned on.\n");
1147                                 return 0;
1148                         }
1149                         clear_opt(sbi->s_mount_opt, QUOTA);
1150                         clear_opt(sbi->s_mount_opt, USRQUOTA);
1151                         clear_opt(sbi->s_mount_opt, GRPQUOTA);
1152                         break;
1153 #else
1154                 case Opt_quota:
1155                 case Opt_usrquota:
1156                 case Opt_grpquota:
1157                         printk(KERN_ERR
1158                                 "EXT3-fs: quota options not supported.\n");
1159                         break;
1160                 case Opt_usrjquota:
1161                 case Opt_grpjquota:
1162                 case Opt_offusrjquota:
1163                 case Opt_offgrpjquota:
1164                 case Opt_jqfmt_vfsold:
1165                 case Opt_jqfmt_vfsv0:
1166                         printk(KERN_ERR
1167                                 "EXT3-fs: journaled quota options not "
1168                                 "supported.\n");
1169                         break;
1170                 case Opt_noquota:
1171                         break;
1172 #endif
1173                 case Opt_abort:
1174                         set_opt(sbi->s_mount_opt, ABORT);
1175                         break;
1176                 case Opt_barrier:
1177                         if (match_int(&args[0], &option))
1178                                 return 0;
1179                         if (option)
1180                                 set_opt(sbi->s_mount_opt, BARRIER);
1181                         else
1182                                 clear_opt(sbi->s_mount_opt, BARRIER);
1183                         break;
1184                 case Opt_ignore:
1185                         break;
1186                 case Opt_resize:
1187                         if (!is_remount) {
1188                                 printk("EXT3-fs: resize option only available "
1189                                         "for remount\n");
1190                                 return 0;
1191                         }
1192                         if (match_int(&args[0], &option) != 0)
1193                                 return 0;
1194                         *n_blocks_count = option;
1195                         break;
1196                 case Opt_nobh:
1197                         set_opt(sbi->s_mount_opt, NOBH);
1198                         break;
1199                 case Opt_bh:
1200                         clear_opt(sbi->s_mount_opt, NOBH);
1201                         break;
1202                 default:
1203                         printk (KERN_ERR
1204                                 "EXT3-fs: Unrecognized mount option \"%s\" "
1205                                 "or missing value\n", p);
1206                         return 0;
1207                 }
1208         }
1209 #ifdef CONFIG_QUOTA
1210         if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1211                 if ((sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA) &&
1212                      sbi->s_qf_names[USRQUOTA])
1213                         clear_opt(sbi->s_mount_opt, USRQUOTA);
1214
1215                 if ((sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA) &&
1216                      sbi->s_qf_names[GRPQUOTA])
1217                         clear_opt(sbi->s_mount_opt, GRPQUOTA);
1218
1219                 if ((sbi->s_qf_names[USRQUOTA] &&
1220                                 (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)) ||
1221                     (sbi->s_qf_names[GRPQUOTA] &&
1222                                 (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA))) {
1223                         printk(KERN_ERR "EXT3-fs: old and new quota "
1224                                         "format mixing.\n");
1225                         return 0;
1226                 }
1227
1228                 if (!sbi->s_jquota_fmt) {
1229                         printk(KERN_ERR "EXT3-fs: journaled quota format "
1230                                         "not specified.\n");
1231                         return 0;
1232                 }
1233         } else {
1234                 if (sbi->s_jquota_fmt) {
1235                         printk(KERN_ERR "EXT3-fs: journaled quota format "
1236                                         "specified with no journaling "
1237                                         "enabled.\n");
1238                         return 0;
1239                 }
1240         }
1241 #endif
1242         return 1;
1243 }
1244
1245 static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1246                             int read_only)
1247 {
1248         struct ext3_sb_info *sbi = EXT3_SB(sb);
1249         int res = 0;
1250
1251         if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
1252                 printk (KERN_ERR "EXT3-fs warning: revision level too high, "
1253                         "forcing read-only mode\n");
1254                 res = MS_RDONLY;
1255         }
1256         if (read_only)
1257                 return res;
1258         if (!(sbi->s_mount_state & EXT3_VALID_FS))
1259                 printk (KERN_WARNING "EXT3-fs warning: mounting unchecked fs, "
1260                         "running e2fsck is recommended\n");
1261         else if ((sbi->s_mount_state & EXT3_ERROR_FS))
1262                 printk (KERN_WARNING
1263                         "EXT3-fs warning: mounting fs with errors, "
1264                         "running e2fsck is recommended\n");
1265         else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1266                  le16_to_cpu(es->s_mnt_count) >=
1267                  (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1268                 printk (KERN_WARNING
1269                         "EXT3-fs warning: maximal mount count reached, "
1270                         "running e2fsck is recommended\n");
1271         else if (le32_to_cpu(es->s_checkinterval) &&
1272                 (le32_to_cpu(es->s_lastcheck) +
1273                         le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1274                 printk (KERN_WARNING
1275                         "EXT3-fs warning: checktime reached, "
1276                         "running e2fsck is recommended\n");
1277 #if 0
1278                 /* @@@ We _will_ want to clear the valid bit if we find
1279                    inconsistencies, to force a fsck at reboot.  But for
1280                    a plain journaled filesystem we can keep it set as
1281                    valid forever! :) */
1282         es->s_state &= cpu_to_le16(~EXT3_VALID_FS);
1283 #endif
1284         if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1285                 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
1286         le16_add_cpu(&es->s_mnt_count, 1);
1287         es->s_mtime = cpu_to_le32(get_seconds());
1288         ext3_update_dynamic_rev(sb);
1289         EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1290
1291         ext3_commit_super(sb, es, 1);
1292         if (test_opt(sb, DEBUG))
1293                 printk(KERN_INFO "[EXT3 FS bs=%lu, gc=%lu, "
1294                                 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1295                         sb->s_blocksize,
1296                         sbi->s_groups_count,
1297                         EXT3_BLOCKS_PER_GROUP(sb),
1298                         EXT3_INODES_PER_GROUP(sb),
1299                         sbi->s_mount_opt);
1300
1301         printk(KERN_INFO "EXT3 FS on %s, ", sb->s_id);
1302         if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1303                 char b[BDEVNAME_SIZE];
1304
1305                 printk("external journal on %s\n",
1306                         bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1307         } else {
1308                 printk("internal journal\n");
1309         }
1310         return res;
1311 }
1312
1313 /* Called at mount-time, super-block is locked */
1314 static int ext3_check_descriptors(struct super_block *sb)
1315 {
1316         struct ext3_sb_info *sbi = EXT3_SB(sb);
1317         int i;
1318
1319         ext3_debug ("Checking group descriptors");
1320
1321         for (i = 0; i < sbi->s_groups_count; i++) {
1322                 struct ext3_group_desc *gdp = ext3_get_group_desc(sb, i, NULL);
1323                 ext3_fsblk_t first_block = ext3_group_first_block_no(sb, i);
1324                 ext3_fsblk_t last_block;
1325
1326                 if (i == sbi->s_groups_count - 1)
1327                         last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
1328                 else
1329                         last_block = first_block +
1330                                 (EXT3_BLOCKS_PER_GROUP(sb) - 1);
1331
1332                 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
1333                     le32_to_cpu(gdp->bg_block_bitmap) > last_block)
1334                 {
1335                         ext3_error (sb, "ext3_check_descriptors",
1336                                     "Block bitmap for group %d"
1337                                     " not in group (block %lu)!",
1338                                     i, (unsigned long)
1339                                         le32_to_cpu(gdp->bg_block_bitmap));
1340                         return 0;
1341                 }
1342                 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
1343                     le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
1344                 {
1345                         ext3_error (sb, "ext3_check_descriptors",
1346                                     "Inode bitmap for group %d"
1347                                     " not in group (block %lu)!",
1348                                     i, (unsigned long)
1349                                         le32_to_cpu(gdp->bg_inode_bitmap));
1350                         return 0;
1351                 }
1352                 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
1353                     le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
1354                     last_block)
1355                 {
1356                         ext3_error (sb, "ext3_check_descriptors",
1357                                     "Inode table for group %d"
1358                                     " not in group (block %lu)!",
1359                                     i, (unsigned long)
1360                                         le32_to_cpu(gdp->bg_inode_table));
1361                         return 0;
1362                 }
1363         }
1364
1365         sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1366         sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1367         return 1;
1368 }
1369
1370
1371 /* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1372  * the superblock) which were deleted from all directories, but held open by
1373  * a process at the time of a crash.  We walk the list and try to delete these
1374  * inodes at recovery time (only with a read-write filesystem).
1375  *
1376  * In order to keep the orphan inode chain consistent during traversal (in
1377  * case of crash during recovery), we link each inode into the superblock
1378  * orphan list_head and handle it the same way as an inode deletion during
1379  * normal operation (which journals the operations for us).
1380  *
1381  * We only do an iget() and an iput() on each inode, which is very safe if we
1382  * accidentally point at an in-use or already deleted inode.  The worst that
1383  * can happen in this case is that we get a "bit already cleared" message from
1384  * ext3_free_inode().  The only reason we would point at a wrong inode is if
1385  * e2fsck was run on this filesystem, and it must have already done the orphan
1386  * inode cleanup for us, so we can safely abort without any further action.
1387  */
1388 static void ext3_orphan_cleanup (struct super_block * sb,
1389                                  struct ext3_super_block * es)
1390 {
1391         unsigned int s_flags = sb->s_flags;
1392         int nr_orphans = 0, nr_truncates = 0;
1393 #ifdef CONFIG_QUOTA
1394         int i;
1395 #endif
1396         if (!es->s_last_orphan) {
1397                 jbd_debug(4, "no orphan inodes to clean up\n");
1398                 return;
1399         }
1400
1401         if (bdev_read_only(sb->s_bdev)) {
1402                 printk(KERN_ERR "EXT3-fs: write access "
1403                         "unavailable, skipping orphan cleanup.\n");
1404                 return;
1405         }
1406
1407         /* Check if feature set allows readwrite operations */
1408         if (EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP)) {
1409                 printk(KERN_INFO "EXT3-fs: %s: Skipping orphan cleanup due to "
1410                          "unknown ROCOMPAT features\n", sb->s_id);
1411                 return;
1412         }
1413
1414         if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1415                 if (es->s_last_orphan)
1416                         jbd_debug(1, "Errors on filesystem, "
1417                                   "clearing orphan list.\n");
1418                 es->s_last_orphan = 0;
1419                 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1420                 return;
1421         }
1422
1423         if (s_flags & MS_RDONLY) {
1424                 printk(KERN_INFO "EXT3-fs: %s: orphan cleanup on readonly fs\n",
1425                        sb->s_id);
1426                 sb->s_flags &= ~MS_RDONLY;
1427         }
1428 #ifdef CONFIG_QUOTA
1429         /* Needed for iput() to work correctly and not trash data */
1430         sb->s_flags |= MS_ACTIVE;
1431         /* Turn on quotas so that they are updated correctly */
1432         for (i = 0; i < MAXQUOTAS; i++) {
1433                 if (EXT3_SB(sb)->s_qf_names[i]) {
1434                         int ret = ext3_quota_on_mount(sb, i);
1435                         if (ret < 0)
1436                                 printk(KERN_ERR
1437                                         "EXT3-fs: Cannot turn on journaled "
1438                                         "quota: error %d\n", ret);
1439                 }
1440         }
1441 #endif
1442
1443         while (es->s_last_orphan) {
1444                 struct inode *inode;
1445
1446                 inode = ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1447                 if (IS_ERR(inode)) {
1448                         es->s_last_orphan = 0;
1449                         break;
1450                 }
1451
1452                 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1453                 vfs_dq_init(inode);
1454                 if (inode->i_nlink) {
1455                         printk(KERN_DEBUG
1456                                 "%s: truncating inode %lu to %Ld bytes\n",
1457                                 __func__, inode->i_ino, inode->i_size);
1458                         jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1459                                   inode->i_ino, inode->i_size);
1460                         ext3_truncate(inode);
1461                         nr_truncates++;
1462                 } else {
1463                         printk(KERN_DEBUG
1464                                 "%s: deleting unreferenced inode %lu\n",
1465                                 __func__, inode->i_ino);
1466                         jbd_debug(2, "deleting unreferenced inode %lu\n",
1467                                   inode->i_ino);
1468                         nr_orphans++;
1469                 }
1470                 iput(inode);  /* The delete magic happens here! */
1471         }
1472
1473 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1474
1475         if (nr_orphans)
1476                 printk(KERN_INFO "EXT3-fs: %s: %d orphan inode%s deleted\n",
1477                        sb->s_id, PLURAL(nr_orphans));
1478         if (nr_truncates)
1479                 printk(KERN_INFO "EXT3-fs: %s: %d truncate%s cleaned up\n",
1480                        sb->s_id, PLURAL(nr_truncates));
1481 #ifdef CONFIG_QUOTA
1482         /* Turn quotas off */
1483         for (i = 0; i < MAXQUOTAS; i++) {
1484                 if (sb_dqopt(sb)->files[i])
1485                         vfs_quota_off(sb, i, 0);
1486         }
1487 #endif
1488         sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1489 }
1490
1491 /*
1492  * Maximal file size.  There is a direct, and {,double-,triple-}indirect
1493  * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1494  * We need to be 1 filesystem block less than the 2^32 sector limit.
1495  */
1496 static loff_t ext3_max_size(int bits)
1497 {
1498         loff_t res = EXT3_NDIR_BLOCKS;
1499         int meta_blocks;
1500         loff_t upper_limit;
1501
1502         /* This is calculated to be the largest file size for a
1503          * dense, file such that the total number of
1504          * sectors in the file, including data and all indirect blocks,
1505          * does not exceed 2^32 -1
1506          * __u32 i_blocks representing the total number of
1507          * 512 bytes blocks of the file
1508          */
1509         upper_limit = (1LL << 32) - 1;
1510
1511         /* total blocks in file system block size */
1512         upper_limit >>= (bits - 9);
1513
1514
1515         /* indirect blocks */
1516         meta_blocks = 1;
1517         /* double indirect blocks */
1518         meta_blocks += 1 + (1LL << (bits-2));
1519         /* tripple indirect blocks */
1520         meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1521
1522         upper_limit -= meta_blocks;
1523         upper_limit <<= bits;
1524
1525         res += 1LL << (bits-2);
1526         res += 1LL << (2*(bits-2));
1527         res += 1LL << (3*(bits-2));
1528         res <<= bits;
1529         if (res > upper_limit)
1530                 res = upper_limit;
1531
1532         if (res > MAX_LFS_FILESIZE)
1533                 res = MAX_LFS_FILESIZE;
1534
1535         return res;
1536 }
1537
1538 static ext3_fsblk_t descriptor_loc(struct super_block *sb,
1539                                     ext3_fsblk_t logic_sb_block,
1540                                     int nr)
1541 {
1542         struct ext3_sb_info *sbi = EXT3_SB(sb);
1543         unsigned long bg, first_meta_bg;
1544         int has_super = 0;
1545
1546         first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1547
1548         if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1549             nr < first_meta_bg)
1550                 return (logic_sb_block + nr + 1);
1551         bg = sbi->s_desc_per_block * nr;
1552         if (ext3_bg_has_super(sb, bg))
1553                 has_super = 1;
1554         return (has_super + ext3_group_first_block_no(sb, bg));
1555 }
1556
1557
1558 static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1559 {
1560         struct buffer_head * bh;
1561         struct ext3_super_block *es = NULL;
1562         struct ext3_sb_info *sbi;
1563         ext3_fsblk_t block;
1564         ext3_fsblk_t sb_block = get_sb_block(&data);
1565         ext3_fsblk_t logic_sb_block;
1566         unsigned long offset = 0;
1567         unsigned int journal_inum = 0;
1568         unsigned long journal_devnum = 0;
1569         unsigned long def_mount_opts;
1570         struct inode *root;
1571         int blocksize;
1572         int hblock;
1573         int db_count;
1574         int i;
1575         int needs_recovery;
1576         int ret = -EINVAL;
1577         __le32 features;
1578         int err;
1579
1580         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1581         if (!sbi)
1582                 return -ENOMEM;
1583
1584         sbi->s_blockgroup_lock =
1585                 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
1586         if (!sbi->s_blockgroup_lock) {
1587                 kfree(sbi);
1588                 return -ENOMEM;
1589         }
1590         sb->s_fs_info = sbi;
1591         sbi->s_mount_opt = 0;
1592         sbi->s_resuid = EXT3_DEF_RESUID;
1593         sbi->s_resgid = EXT3_DEF_RESGID;
1594         sbi->s_sb_block = sb_block;
1595
1596         unlock_kernel();
1597
1598         blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1599         if (!blocksize) {
1600                 printk(KERN_ERR "EXT3-fs: unable to set blocksize\n");
1601                 goto out_fail;
1602         }
1603
1604         /*
1605          * The ext3 superblock will not be buffer aligned for other than 1kB
1606          * block sizes.  We need to calculate the offset from buffer start.
1607          */
1608         if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1609                 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1610                 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1611         } else {
1612                 logic_sb_block = sb_block;
1613         }
1614
1615         if (!(bh = sb_bread(sb, logic_sb_block))) {
1616                 printk (KERN_ERR "EXT3-fs: unable to read superblock\n");
1617                 goto out_fail;
1618         }
1619         /*
1620          * Note: s_es must be initialized as soon as possible because
1621          *       some ext3 macro-instructions depend on its value
1622          */
1623         es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1624         sbi->s_es = es;
1625         sb->s_magic = le16_to_cpu(es->s_magic);
1626         if (sb->s_magic != EXT3_SUPER_MAGIC)
1627                 goto cantfind_ext3;
1628
1629         /* Set defaults before we parse the mount options */
1630         def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1631         if (def_mount_opts & EXT3_DEFM_DEBUG)
1632                 set_opt(sbi->s_mount_opt, DEBUG);
1633         if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1634                 set_opt(sbi->s_mount_opt, GRPID);
1635         if (def_mount_opts & EXT3_DEFM_UID16)
1636                 set_opt(sbi->s_mount_opt, NO_UID32);
1637 #ifdef CONFIG_EXT3_FS_XATTR
1638         if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1639                 set_opt(sbi->s_mount_opt, XATTR_USER);
1640 #endif
1641 #ifdef CONFIG_EXT3_FS_POSIX_ACL
1642         if (def_mount_opts & EXT3_DEFM_ACL)
1643                 set_opt(sbi->s_mount_opt, POSIX_ACL);
1644 #endif
1645         if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1646                 sbi->s_mount_opt |= EXT3_MOUNT_JOURNAL_DATA;
1647         else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1648                 sbi->s_mount_opt |= EXT3_MOUNT_ORDERED_DATA;
1649         else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1650                 sbi->s_mount_opt |= EXT3_MOUNT_WRITEBACK_DATA;
1651
1652         if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1653                 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1654         else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_CONTINUE)
1655                 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1656         else
1657                 set_opt(sbi->s_mount_opt, ERRORS_RO);
1658
1659         sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1660         sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1661
1662         set_opt(sbi->s_mount_opt, RESERVATION);
1663
1664         if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1665                             NULL, 0))
1666                 goto failed_mount;
1667
1668         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1669                 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1670
1671         if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1672             (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1673              EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1674              EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1675                 printk(KERN_WARNING
1676                        "EXT3-fs warning: feature flags set on rev 0 fs, "
1677                        "running e2fsck is recommended\n");
1678         /*
1679          * Check feature flags regardless of the revision level, since we
1680          * previously didn't change the revision level when setting the flags,
1681          * so there is a chance incompat flags are set on a rev 0 filesystem.
1682          */
1683         features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1684         if (features) {
1685                 printk(KERN_ERR "EXT3-fs: %s: couldn't mount because of "
1686                        "unsupported optional features (%x).\n",
1687                        sb->s_id, le32_to_cpu(features));
1688                 goto failed_mount;
1689         }
1690         features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1691         if (!(sb->s_flags & MS_RDONLY) && features) {
1692                 printk(KERN_ERR "EXT3-fs: %s: couldn't mount RDWR because of "
1693                        "unsupported optional features (%x).\n",
1694                        sb->s_id, le32_to_cpu(features));
1695                 goto failed_mount;
1696         }
1697         blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1698
1699         if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1700             blocksize > EXT3_MAX_BLOCK_SIZE) {
1701                 printk(KERN_ERR
1702                        "EXT3-fs: Unsupported filesystem blocksize %d on %s.\n",
1703                        blocksize, sb->s_id);
1704                 goto failed_mount;
1705         }
1706
1707         hblock = bdev_logical_block_size(sb->s_bdev);
1708         if (sb->s_blocksize != blocksize) {
1709                 /*
1710                  * Make sure the blocksize for the filesystem is larger
1711                  * than the hardware sectorsize for the machine.
1712                  */
1713                 if (blocksize < hblock) {
1714                         printk(KERN_ERR "EXT3-fs: blocksize %d too small for "
1715                                "device blocksize %d.\n", blocksize, hblock);
1716                         goto failed_mount;
1717                 }
1718
1719                 brelse (bh);
1720                 if (!sb_set_blocksize(sb, blocksize)) {
1721                         printk(KERN_ERR "EXT3-fs: bad blocksize %d.\n",
1722                                 blocksize);
1723                         goto out_fail;
1724                 }
1725                 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1726                 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1727                 bh = sb_bread(sb, logic_sb_block);
1728                 if (!bh) {
1729                         printk(KERN_ERR
1730                                "EXT3-fs: Can't read superblock on 2nd try.\n");
1731                         goto failed_mount;
1732                 }
1733                 es = (struct ext3_super_block *)(((char *)bh->b_data) + offset);
1734                 sbi->s_es = es;
1735                 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
1736                         printk (KERN_ERR
1737                                 "EXT3-fs: Magic mismatch, very weird !\n");
1738                         goto failed_mount;
1739                 }
1740         }
1741
1742         sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1743
1744         if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1745                 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1746                 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1747         } else {
1748                 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1749                 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1750                 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
1751                     (!is_power_of_2(sbi->s_inode_size)) ||
1752                     (sbi->s_inode_size > blocksize)) {
1753                         printk (KERN_ERR
1754                                 "EXT3-fs: unsupported inode size: %d\n",
1755                                 sbi->s_inode_size);
1756                         goto failed_mount;
1757                 }
1758         }
1759         sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1760                                    le32_to_cpu(es->s_log_frag_size);
1761         if (blocksize != sbi->s_frag_size) {
1762                 printk(KERN_ERR
1763                        "EXT3-fs: fragsize %lu != blocksize %u (unsupported)\n",
1764                        sbi->s_frag_size, blocksize);
1765                 goto failed_mount;
1766         }
1767         sbi->s_frags_per_block = 1;
1768         sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1769         sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1770         sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1771         if (EXT3_INODE_SIZE(sb) == 0 || EXT3_INODES_PER_GROUP(sb) == 0)
1772                 goto cantfind_ext3;
1773         sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1774         if (sbi->s_inodes_per_block == 0)
1775                 goto cantfind_ext3;
1776         sbi->s_itb_per_group = sbi->s_inodes_per_group /
1777                                         sbi->s_inodes_per_block;
1778         sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1779         sbi->s_sbh = bh;
1780         sbi->s_mount_state = le16_to_cpu(es->s_state);
1781         sbi->s_addr_per_block_bits = ilog2(EXT3_ADDR_PER_BLOCK(sb));
1782         sbi->s_desc_per_block_bits = ilog2(EXT3_DESC_PER_BLOCK(sb));
1783         for (i=0; i < 4; i++)
1784                 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1785         sbi->s_def_hash_version = es->s_def_hash_version;
1786         i = le32_to_cpu(es->s_flags);
1787         if (i & EXT2_FLAGS_UNSIGNED_HASH)
1788                 sbi->s_hash_unsigned = 3;
1789         else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
1790 #ifdef __CHAR_UNSIGNED__
1791                 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
1792                 sbi->s_hash_unsigned = 3;
1793 #else
1794                 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
1795 #endif
1796         }
1797
1798         if (sbi->s_blocks_per_group > blocksize * 8) {
1799                 printk (KERN_ERR
1800                         "EXT3-fs: #blocks per group too big: %lu\n",
1801                         sbi->s_blocks_per_group);
1802                 goto failed_mount;
1803         }
1804         if (sbi->s_frags_per_group > blocksize * 8) {
1805                 printk (KERN_ERR
1806                         "EXT3-fs: #fragments per group too big: %lu\n",
1807                         sbi->s_frags_per_group);
1808                 goto failed_mount;
1809         }
1810         if (sbi->s_inodes_per_group > blocksize * 8) {
1811                 printk (KERN_ERR
1812                         "EXT3-fs: #inodes per group too big: %lu\n",
1813                         sbi->s_inodes_per_group);
1814                 goto failed_mount;
1815         }
1816
1817         if (le32_to_cpu(es->s_blocks_count) >
1818                     (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
1819                 printk(KERN_ERR "EXT3-fs: filesystem on %s:"
1820                         " too large to mount safely\n", sb->s_id);
1821                 if (sizeof(sector_t) < 8)
1822                         printk(KERN_WARNING "EXT3-fs: CONFIG_LBDAF not "
1823                                         "enabled\n");
1824                 goto failed_mount;
1825         }
1826
1827         if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1828                 goto cantfind_ext3;
1829         sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1830                                le32_to_cpu(es->s_first_data_block) - 1)
1831                                        / EXT3_BLOCKS_PER_GROUP(sb)) + 1;
1832         db_count = (sbi->s_groups_count + EXT3_DESC_PER_BLOCK(sb) - 1) /
1833                    EXT3_DESC_PER_BLOCK(sb);
1834         sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1835                                     GFP_KERNEL);
1836         if (sbi->s_group_desc == NULL) {
1837                 printk (KERN_ERR "EXT3-fs: not enough memory\n");
1838                 goto failed_mount;
1839         }
1840
1841         bgl_lock_init(sbi->s_blockgroup_lock);
1842
1843         for (i = 0; i < db_count; i++) {
1844                 block = descriptor_loc(sb, logic_sb_block, i);
1845                 sbi->s_group_desc[i] = sb_bread(sb, block);
1846                 if (!sbi->s_group_desc[i]) {
1847                         printk (KERN_ERR "EXT3-fs: "
1848                                 "can't read group descriptor %d\n", i);
1849                         db_count = i;
1850                         goto failed_mount2;
1851                 }
1852         }
1853         if (!ext3_check_descriptors (sb)) {
1854                 printk(KERN_ERR "EXT3-fs: group descriptors corrupted!\n");
1855                 goto failed_mount2;
1856         }
1857         sbi->s_gdb_count = db_count;
1858         get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1859         spin_lock_init(&sbi->s_next_gen_lock);
1860
1861         err = percpu_counter_init(&sbi->s_freeblocks_counter,
1862                         ext3_count_free_blocks(sb));
1863         if (!err) {
1864                 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1865                                 ext3_count_free_inodes(sb));
1866         }
1867         if (!err) {
1868                 err = percpu_counter_init(&sbi->s_dirs_counter,
1869                                 ext3_count_dirs(sb));
1870         }
1871         if (err) {
1872                 printk(KERN_ERR "EXT3-fs: insufficient memory\n");
1873                 goto failed_mount3;
1874         }
1875
1876         /* per fileystem reservation list head & lock */
1877         spin_lock_init(&sbi->s_rsv_window_lock);
1878         sbi->s_rsv_window_root = RB_ROOT;
1879         /* Add a single, static dummy reservation to the start of the
1880          * reservation window list --- it gives us a placeholder for
1881          * append-at-start-of-list which makes the allocation logic
1882          * _much_ simpler. */
1883         sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1884         sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1885         sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1886         sbi->s_rsv_window_head.rsv_goal_size = 0;
1887         ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1888
1889         /*
1890          * set up enough so that it can read an inode
1891          */
1892         sb->s_op = &ext3_sops;
1893         sb->s_export_op = &ext3_export_ops;
1894         sb->s_xattr = ext3_xattr_handlers;
1895 #ifdef CONFIG_QUOTA
1896         sb->s_qcop = &ext3_qctl_operations;
1897         sb->dq_op = &ext3_quota_operations;
1898 #endif
1899         INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1900
1901         sb->s_root = NULL;
1902
1903         needs_recovery = (es->s_last_orphan != 0 ||
1904                           EXT3_HAS_INCOMPAT_FEATURE(sb,
1905                                     EXT3_FEATURE_INCOMPAT_RECOVER));
1906
1907         /*
1908          * The first inode we look at is the journal inode.  Don't try
1909          * root first: it may be modified in the journal!
1910          */
1911         if (!test_opt(sb, NOLOAD) &&
1912             EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
1913                 if (ext3_load_journal(sb, es, journal_devnum))
1914                         goto failed_mount3;
1915         } else if (journal_inum) {
1916                 if (ext3_create_journal(sb, es, journal_inum))
1917                         goto failed_mount3;
1918         } else {
1919                 if (!silent)
1920                         printk (KERN_ERR
1921                                 "ext3: No journal on filesystem on %s\n",
1922                                 sb->s_id);
1923                 goto failed_mount3;
1924         }
1925
1926         /* We have now updated the journal if required, so we can
1927          * validate the data journaling mode. */
1928         switch (test_opt(sb, DATA_FLAGS)) {
1929         case 0:
1930                 /* No mode set, assume a default based on the journal
1931                    capabilities: ORDERED_DATA if the journal can
1932                    cope, else JOURNAL_DATA */
1933                 if (journal_check_available_features
1934                     (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
1935                         set_opt(sbi->s_mount_opt, DEFAULT_DATA_MODE);
1936                 else
1937                         set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1938                 break;
1939
1940         case EXT3_MOUNT_ORDERED_DATA:
1941         case EXT3_MOUNT_WRITEBACK_DATA:
1942                 if (!journal_check_available_features
1943                     (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
1944                         printk(KERN_ERR "EXT3-fs: Journal does not support "
1945                                "requested data journaling mode\n");
1946                         goto failed_mount4;
1947                 }
1948         default:
1949                 break;
1950         }
1951
1952         if (test_opt(sb, NOBH)) {
1953                 if (!(test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)) {
1954                         printk(KERN_WARNING "EXT3-fs: Ignoring nobh option - "
1955                                 "its supported only with writeback mode\n");
1956                         clear_opt(sbi->s_mount_opt, NOBH);
1957                 }
1958         }
1959         /*
1960          * The journal_load will have done any necessary log recovery,
1961          * so we can safely mount the rest of the filesystem now.
1962          */
1963
1964         root = ext3_iget(sb, EXT3_ROOT_INO);
1965         if (IS_ERR(root)) {
1966                 printk(KERN_ERR "EXT3-fs: get root inode failed\n");
1967                 ret = PTR_ERR(root);
1968                 goto failed_mount4;
1969         }
1970         if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1971                 iput(root);
1972                 printk(KERN_ERR "EXT3-fs: corrupt root inode, run e2fsck\n");
1973                 goto failed_mount4;
1974         }
1975         sb->s_root = d_alloc_root(root);
1976         if (!sb->s_root) {
1977                 printk(KERN_ERR "EXT3-fs: get root dentry failed\n");
1978                 iput(root);
1979                 ret = -ENOMEM;
1980                 goto failed_mount4;
1981         }
1982
1983         ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
1984         /*
1985          * akpm: core read_super() calls in here with the superblock locked.
1986          * That deadlocks, because orphan cleanup needs to lock the superblock
1987          * in numerous places.  Here we just pop the lock - it's relatively
1988          * harmless, because we are now ready to accept write_super() requests,
1989          * and aviro says that's the only reason for hanging onto the
1990          * superblock lock.
1991          */
1992         EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
1993         ext3_orphan_cleanup(sb, es);
1994         EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
1995         if (needs_recovery)
1996                 printk (KERN_INFO "EXT3-fs: recovery complete.\n");
1997         ext3_mark_recovery_complete(sb, es);
1998         printk (KERN_INFO "EXT3-fs: mounted filesystem with %s data mode.\n",
1999                 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
2000                 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
2001                 "writeback");
2002
2003         lock_kernel();
2004         return 0;
2005
2006 cantfind_ext3:
2007         if (!silent)
2008                 printk(KERN_ERR "VFS: Can't find ext3 filesystem on dev %s.\n",
2009                        sb->s_id);
2010         goto failed_mount;
2011
2012 failed_mount4:
2013         journal_destroy(sbi->s_journal);
2014 failed_mount3:
2015         percpu_counter_destroy(&sbi->s_freeblocks_counter);
2016         percpu_counter_destroy(&sbi->s_freeinodes_counter);
2017         percpu_counter_destroy(&sbi->s_dirs_counter);
2018 failed_mount2:
2019         for (i = 0; i < db_count; i++)
2020                 brelse(sbi->s_group_desc[i]);
2021         kfree(sbi->s_group_desc);
2022 failed_mount:
2023 #ifdef CONFIG_QUOTA
2024         for (i = 0; i < MAXQUOTAS; i++)
2025                 kfree(sbi->s_qf_names[i]);
2026 #endif
2027         ext3_blkdev_remove(sbi);
2028         brelse(bh);
2029 out_fail:
2030         sb->s_fs_info = NULL;
2031         kfree(sbi->s_blockgroup_lock);
2032         kfree(sbi);
2033         lock_kernel();
2034         return ret;
2035 }
2036
2037 /*
2038  * Setup any per-fs journal parameters now.  We'll do this both on
2039  * initial mount, once the journal has been initialised but before we've
2040  * done any recovery; and again on any subsequent remount.
2041  */
2042 static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
2043 {
2044         struct ext3_sb_info *sbi = EXT3_SB(sb);
2045
2046         if (sbi->s_commit_interval)
2047                 journal->j_commit_interval = sbi->s_commit_interval;
2048         /* We could also set up an ext3-specific default for the commit
2049          * interval here, but for now we'll just fall back to the jbd
2050          * default. */
2051
2052         spin_lock(&journal->j_state_lock);
2053         if (test_opt(sb, BARRIER))
2054                 journal->j_flags |= JFS_BARRIER;
2055         else
2056                 journal->j_flags &= ~JFS_BARRIER;
2057         if (test_opt(sb, DATA_ERR_ABORT))
2058                 journal->j_flags |= JFS_ABORT_ON_SYNCDATA_ERR;
2059         else
2060                 journal->j_flags &= ~JFS_ABORT_ON_SYNCDATA_ERR;
2061         spin_unlock(&journal->j_state_lock);
2062 }
2063
2064 static journal_t *ext3_get_journal(struct super_block *sb,
2065                                    unsigned int journal_inum)
2066 {
2067         struct inode *journal_inode;
2068         journal_t *journal;
2069
2070         /* First, test for the existence of a valid inode on disk.  Bad
2071          * things happen if we iget() an unused inode, as the subsequent
2072          * iput() will try to delete it. */
2073
2074         journal_inode = ext3_iget(sb, journal_inum);
2075         if (IS_ERR(journal_inode)) {
2076                 printk(KERN_ERR "EXT3-fs: no journal found.\n");
2077                 return NULL;
2078         }
2079         if (!journal_inode->i_nlink) {
2080                 make_bad_inode(journal_inode);
2081                 iput(journal_inode);
2082                 printk(KERN_ERR "EXT3-fs: journal inode is deleted.\n");
2083                 return NULL;
2084         }
2085
2086         jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2087                   journal_inode, journal_inode->i_size);
2088         if (!S_ISREG(journal_inode->i_mode)) {
2089                 printk(KERN_ERR "EXT3-fs: invalid journal inode.\n");
2090                 iput(journal_inode);
2091                 return NULL;
2092         }
2093
2094         journal = journal_init_inode(journal_inode);
2095         if (!journal) {
2096                 printk(KERN_ERR "EXT3-fs: Could not load journal inode\n");
2097                 iput(journal_inode);
2098                 return NULL;
2099         }
2100         journal->j_private = sb;
2101         ext3_init_journal_params(sb, journal);
2102         return journal;
2103 }
2104
2105 static journal_t *ext3_get_dev_journal(struct super_block *sb,
2106                                        dev_t j_dev)
2107 {
2108         struct buffer_head * bh;
2109         journal_t *journal;
2110         ext3_fsblk_t start;
2111         ext3_fsblk_t len;
2112         int hblock, blocksize;
2113         ext3_fsblk_t sb_block;
2114         unsigned long offset;
2115         struct ext3_super_block * es;
2116         struct block_device *bdev;
2117
2118         bdev = ext3_blkdev_get(j_dev);
2119         if (bdev == NULL)
2120                 return NULL;
2121
2122         if (bd_claim(bdev, sb)) {
2123                 printk(KERN_ERR
2124                         "EXT3: failed to claim external journal device.\n");
2125                 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
2126                 return NULL;
2127         }
2128
2129         blocksize = sb->s_blocksize;
2130         hblock = bdev_logical_block_size(bdev);
2131         if (blocksize < hblock) {
2132                 printk(KERN_ERR
2133                         "EXT3-fs: blocksize too small for journal device.\n");
2134                 goto out_bdev;
2135         }
2136
2137         sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
2138         offset = EXT3_MIN_BLOCK_SIZE % blocksize;
2139         set_blocksize(bdev, blocksize);
2140         if (!(bh = __bread(bdev, sb_block, blocksize))) {
2141                 printk(KERN_ERR "EXT3-fs: couldn't read superblock of "
2142                        "external journal\n");
2143                 goto out_bdev;
2144         }
2145
2146         es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
2147         if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
2148             !(le32_to_cpu(es->s_feature_incompat) &
2149               EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2150                 printk(KERN_ERR "EXT3-fs: external journal has "
2151                                         "bad superblock\n");
2152                 brelse(bh);
2153                 goto out_bdev;
2154         }
2155
2156         if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2157                 printk(KERN_ERR "EXT3-fs: journal UUID does not match\n");
2158                 brelse(bh);
2159                 goto out_bdev;
2160         }
2161
2162         len = le32_to_cpu(es->s_blocks_count);
2163         start = sb_block + 1;
2164         brelse(bh);     /* we're done with the superblock */
2165
2166         journal = journal_init_dev(bdev, sb->s_bdev,
2167                                         start, len, blocksize);
2168         if (!journal) {
2169                 printk(KERN_ERR "EXT3-fs: failed to create device journal\n");
2170                 goto out_bdev;
2171         }
2172         journal->j_private = sb;
2173         ll_rw_block(READ, 1, &journal->j_sb_buffer);
2174         wait_on_buffer(journal->j_sb_buffer);
2175         if (!buffer_uptodate(journal->j_sb_buffer)) {
2176                 printk(KERN_ERR "EXT3-fs: I/O error on journal device\n");
2177                 goto out_journal;
2178         }
2179         if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
2180                 printk(KERN_ERR "EXT3-fs: External journal has more than one "
2181                                         "user (unsupported) - %d\n",
2182                         be32_to_cpu(journal->j_superblock->s_nr_users));
2183                 goto out_journal;
2184         }
2185         EXT3_SB(sb)->journal_bdev = bdev;
2186         ext3_init_journal_params(sb, journal);
2187         return journal;
2188 out_journal:
2189         journal_destroy(journal);
2190 out_bdev:
2191         ext3_blkdev_put(bdev);
2192         return NULL;
2193 }
2194
2195 static int ext3_load_journal(struct super_block *sb,
2196                              struct ext3_super_block *es,
2197                              unsigned long journal_devnum)
2198 {
2199         journal_t *journal;
2200         unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2201         dev_t journal_dev;
2202         int err = 0;
2203         int really_read_only;
2204
2205         if (journal_devnum &&
2206             journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2207                 printk(KERN_INFO "EXT3-fs: external journal device major/minor "
2208                         "numbers have changed\n");
2209                 journal_dev = new_decode_dev(journal_devnum);
2210         } else
2211                 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2212
2213         really_read_only = bdev_read_only(sb->s_bdev);
2214
2215         /*
2216          * Are we loading a blank journal or performing recovery after a
2217          * crash?  For recovery, we need to check in advance whether we
2218          * can get read-write access to the device.
2219          */
2220
2221         if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
2222                 if (sb->s_flags & MS_RDONLY) {
2223                         printk(KERN_INFO "EXT3-fs: INFO: recovery "
2224                                         "required on readonly filesystem.\n");
2225                         if (really_read_only) {
2226                                 printk(KERN_ERR "EXT3-fs: write access "
2227                                         "unavailable, cannot proceed.\n");
2228                                 return -EROFS;
2229                         }
2230                         printk (KERN_INFO "EXT3-fs: write access will "
2231                                         "be enabled during recovery.\n");
2232                 }
2233         }
2234
2235         if (journal_inum && journal_dev) {
2236                 printk(KERN_ERR "EXT3-fs: filesystem has both journal "
2237                        "and inode journals!\n");
2238                 return -EINVAL;
2239         }
2240
2241         if (journal_inum) {
2242                 if (!(journal = ext3_get_journal(sb, journal_inum)))
2243                         return -EINVAL;
2244         } else {
2245                 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
2246                         return -EINVAL;
2247         }
2248
2249         if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2250                 err = journal_update_format(journal);
2251                 if (err)  {
2252                         printk(KERN_ERR "EXT3-fs: error updating journal.\n");
2253                         journal_destroy(journal);
2254                         return err;
2255                 }
2256         }
2257
2258         if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
2259                 err = journal_wipe(journal, !really_read_only);
2260         if (!err)
2261                 err = journal_load(journal);
2262
2263         if (err) {
2264                 printk(KERN_ERR "EXT3-fs: error loading journal.\n");
2265                 journal_destroy(journal);
2266                 return err;
2267         }
2268
2269         EXT3_SB(sb)->s_journal = journal;
2270         ext3_clear_journal_err(sb, es);
2271
2272         if (journal_devnum &&
2273             journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2274                 es->s_journal_dev = cpu_to_le32(journal_devnum);
2275
2276                 /* Make sure we flush the recovery flag to disk. */
2277                 ext3_commit_super(sb, es, 1);
2278         }
2279
2280         return 0;
2281 }
2282
2283 static int ext3_create_journal(struct super_block * sb,
2284                                struct ext3_super_block * es,
2285                                unsigned int journal_inum)
2286 {
2287         journal_t *journal;
2288         int err;
2289
2290         if (sb->s_flags & MS_RDONLY) {
2291                 printk(KERN_ERR "EXT3-fs: readonly filesystem when trying to "
2292                                 "create journal.\n");
2293                 return -EROFS;
2294         }
2295
2296         journal = ext3_get_journal(sb, journal_inum);
2297         if (!journal)
2298                 return -EINVAL;
2299
2300         printk(KERN_INFO "EXT3-fs: creating new journal on inode %u\n",
2301                journal_inum);
2302
2303         err = journal_create(journal);
2304         if (err) {
2305                 printk(KERN_ERR "EXT3-fs: error creating journal.\n");
2306                 journal_destroy(journal);
2307                 return -EIO;
2308         }
2309
2310         EXT3_SB(sb)->s_journal = journal;
2311
2312         ext3_update_dynamic_rev(sb);
2313         EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2314         EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2315
2316         es->s_journal_inum = cpu_to_le32(journal_inum);
2317
2318         /* Make sure we flush the recovery flag to disk. */
2319         ext3_commit_super(sb, es, 1);
2320
2321         return 0;
2322 }
2323
2324 static int ext3_commit_super(struct super_block *sb,
2325                                struct ext3_super_block *es,
2326                                int sync)
2327 {
2328         struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
2329         int error = 0;
2330
2331         if (!sbh)
2332                 return error;
2333         /*
2334          * If the file system is mounted read-only, don't update the
2335          * superblock write time.  This avoids updating the superblock
2336          * write time when we are mounting the root file system
2337          * read/only but we need to replay the journal; at that point,
2338          * for people who are east of GMT and who make their clock
2339          * tick in localtime for Windows bug-for-bug compatibility,
2340          * the clock is set in the future, and this will cause e2fsck
2341          * to complain and force a full file system check.
2342          */
2343         if (!(sb->s_flags & MS_RDONLY))
2344                 es->s_wtime = cpu_to_le32(get_seconds());
2345         es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2346         es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2347         BUFFER_TRACE(sbh, "marking dirty");
2348         mark_buffer_dirty(sbh);
2349         if (sync)
2350                 error = sync_dirty_buffer(sbh);
2351         return error;
2352 }
2353
2354
2355 /*
2356  * Have we just finished recovery?  If so, and if we are mounting (or
2357  * remounting) the filesystem readonly, then we will end up with a
2358  * consistent fs on disk.  Record that fact.
2359  */
2360 static void ext3_mark_recovery_complete(struct super_block * sb,
2361                                         struct ext3_super_block * es)
2362 {
2363         journal_t *journal = EXT3_SB(sb)->s_journal;
2364
2365         journal_lock_updates(journal);
2366         if (journal_flush(journal) < 0)
2367                 goto out;
2368
2369         lock_super(sb);
2370         if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2371             sb->s_flags & MS_RDONLY) {
2372                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2373                 ext3_commit_super(sb, es, 1);
2374         }
2375         unlock_super(sb);
2376
2377 out:
2378         journal_unlock_updates(journal);
2379 }
2380
2381 /*
2382  * If we are mounting (or read-write remounting) a filesystem whose journal
2383  * has recorded an error from a previous lifetime, move that error to the
2384  * main filesystem now.
2385  */
2386 static void ext3_clear_journal_err(struct super_block * sb,
2387                                    struct ext3_super_block * es)
2388 {
2389         journal_t *journal;
2390         int j_errno;
2391         const char *errstr;
2392
2393         journal = EXT3_SB(sb)->s_journal;
2394
2395         /*
2396          * Now check for any error status which may have been recorded in the
2397          * journal by a prior ext3_error() or ext3_abort()
2398          */
2399
2400         j_errno = journal_errno(journal);
2401         if (j_errno) {
2402                 char nbuf[16];
2403
2404                 errstr = ext3_decode_error(sb, j_errno, nbuf);
2405                 ext3_warning(sb, __func__, "Filesystem error recorded "
2406                              "from previous mount: %s", errstr);
2407                 ext3_warning(sb, __func__, "Marking fs in need of "
2408                              "filesystem check.");
2409
2410                 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2411                 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2412                 ext3_commit_super (sb, es, 1);
2413
2414                 journal_clear_err(journal);
2415         }
2416 }
2417
2418 /*
2419  * Force the running and committing transactions to commit,
2420  * and wait on the commit.
2421  */
2422 int ext3_force_commit(struct super_block *sb)
2423 {
2424         journal_t *journal;
2425         int ret;
2426
2427         if (sb->s_flags & MS_RDONLY)
2428                 return 0;
2429
2430         journal = EXT3_SB(sb)->s_journal;
2431         ret = ext3_journal_force_commit(journal);
2432         return ret;
2433 }
2434
2435 static int ext3_sync_fs(struct super_block *sb, int wait)
2436 {
2437         tid_t target;
2438
2439         if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2440                 if (wait)
2441                         log_wait_commit(EXT3_SB(sb)->s_journal, target);
2442         }
2443         return 0;
2444 }
2445
2446 /*
2447  * LVM calls this function before a (read-only) snapshot is created.  This
2448  * gives us a chance to flush the journal completely and mark the fs clean.
2449  */
2450 static int ext3_freeze(struct super_block *sb)
2451 {
2452         int error = 0;
2453         journal_t *journal;
2454
2455         if (!(sb->s_flags & MS_RDONLY)) {
2456                 journal = EXT3_SB(sb)->s_journal;
2457
2458                 /* Now we set up the journal barrier. */
2459                 journal_lock_updates(journal);
2460
2461                 /*
2462                  * We don't want to clear needs_recovery flag when we failed
2463                  * to flush the journal.
2464                  */
2465                 error = journal_flush(journal);
2466                 if (error < 0)
2467                         goto out;
2468
2469                 /* Journal blocked and flushed, clear needs_recovery flag. */
2470                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2471                 error = ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2472                 if (error)
2473                         goto out;
2474         }
2475         return 0;
2476
2477 out:
2478         journal_unlock_updates(journal);
2479         return error;
2480 }
2481
2482 /*
2483  * Called by LVM after the snapshot is done.  We need to reset the RECOVER
2484  * flag here, even though the filesystem is not technically dirty yet.
2485  */
2486 static int ext3_unfreeze(struct super_block *sb)
2487 {
2488         if (!(sb->s_flags & MS_RDONLY)) {
2489                 lock_super(sb);
2490                 /* Reser the needs_recovery flag before the fs is unlocked. */
2491                 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2492                 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2493                 unlock_super(sb);
2494                 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2495         }
2496         return 0;
2497 }
2498
2499 static int ext3_remount (struct super_block * sb, int * flags, char * data)
2500 {
2501         struct ext3_super_block * es;
2502         struct ext3_sb_info *sbi = EXT3_SB(sb);
2503         ext3_fsblk_t n_blocks_count = 0;
2504         unsigned long old_sb_flags;
2505         struct ext3_mount_options old_opts;
2506         int err;
2507 #ifdef CONFIG_QUOTA
2508         int i;
2509 #endif
2510
2511         lock_kernel();
2512
2513         /* Store the original options */
2514         lock_super(sb);
2515         old_sb_flags = sb->s_flags;
2516         old_opts.s_mount_opt = sbi->s_mount_opt;
2517         old_opts.s_resuid = sbi->s_resuid;
2518         old_opts.s_resgid = sbi->s_resgid;
2519         old_opts.s_commit_interval = sbi->s_commit_interval;
2520 #ifdef CONFIG_QUOTA
2521         old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2522         for (i = 0; i < MAXQUOTAS; i++)
2523                 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2524 #endif
2525
2526         /*
2527          * Allow the "check" option to be passed as a remount option.
2528          */
2529         if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2530                 err = -EINVAL;
2531                 goto restore_opts;
2532         }
2533
2534         if (sbi->s_mount_opt & EXT3_MOUNT_ABORT)
2535                 ext3_abort(sb, __func__, "Abort forced by user");
2536
2537         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2538                 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2539
2540         es = sbi->s_es;
2541
2542         ext3_init_journal_params(sb, sbi->s_journal);
2543
2544         if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2545                 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
2546                 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT) {
2547                         err = -EROFS;
2548                         goto restore_opts;
2549                 }
2550
2551                 if (*flags & MS_RDONLY) {
2552                         /*
2553                          * First of all, the unconditional stuff we have to do
2554                          * to disable replay of the journal when we next remount
2555                          */
2556                         sb->s_flags |= MS_RDONLY;
2557
2558                         /*
2559                          * OK, test if we are remounting a valid rw partition
2560                          * readonly, and if so set the rdonly flag and then
2561                          * mark the partition as valid again.
2562                          */
2563                         if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2564                             (sbi->s_mount_state & EXT3_VALID_FS))
2565                                 es->s_state = cpu_to_le16(sbi->s_mount_state);
2566
2567                         /*
2568                          * We have to unlock super so that we can wait for
2569                          * transactions.
2570                          */
2571                         unlock_super(sb);
2572                         ext3_mark_recovery_complete(sb, es);
2573                         lock_super(sb);
2574                 } else {
2575                         __le32 ret;
2576                         if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2577                                         ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2578                                 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2579                                        "remount RDWR because of unsupported "
2580                                        "optional features (%x).\n",
2581                                        sb->s_id, le32_to_cpu(ret));
2582                                 err = -EROFS;
2583                                 goto restore_opts;
2584                         }
2585
2586                         /*
2587                          * If we have an unprocessed orphan list hanging
2588                          * around from a previously readonly bdev mount,
2589                          * require a full umount/remount for now.
2590                          */
2591                         if (es->s_last_orphan) {
2592                                 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2593                                        "remount RDWR because of unprocessed "
2594                                        "orphan inode list.  Please "
2595                                        "umount/remount instead.\n",
2596                                        sb->s_id);
2597                                 err = -EINVAL;
2598                                 goto restore_opts;
2599                         }
2600
2601                         /*
2602                          * Mounting a RDONLY partition read-write, so reread
2603                          * and store the current valid flag.  (It may have
2604                          * been changed by e2fsck since we originally mounted
2605                          * the partition.)
2606                          */
2607                         ext3_clear_journal_err(sb, es);
2608                         sbi->s_mount_state = le16_to_cpu(es->s_state);
2609                         if ((err = ext3_group_extend(sb, es, n_blocks_count)))
2610                                 goto restore_opts;
2611                         if (!ext3_setup_super (sb, es, 0))
2612                                 sb->s_flags &= ~MS_RDONLY;
2613                 }
2614         }
2615 #ifdef CONFIG_QUOTA
2616         /* Release old quota file names */
2617         for (i = 0; i < MAXQUOTAS; i++)
2618                 if (old_opts.s_qf_names[i] &&
2619                     old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2620                         kfree(old_opts.s_qf_names[i]);
2621 #endif
2622         unlock_super(sb);
2623         unlock_kernel();
2624         return 0;
2625 restore_opts:
2626         sb->s_flags = old_sb_flags;
2627         sbi->s_mount_opt = old_opts.s_mount_opt;
2628         sbi->s_resuid = old_opts.s_resuid;
2629         sbi->s_resgid = old_opts.s_resgid;
2630         sbi->s_commit_interval = old_opts.s_commit_interval;
2631 #ifdef CONFIG_QUOTA
2632         sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2633         for (i = 0; i < MAXQUOTAS; i++) {
2634                 if (sbi->s_qf_names[i] &&
2635                     old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2636                         kfree(sbi->s_qf_names[i]);
2637                 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2638         }
2639 #endif
2640         unlock_super(sb);
2641         unlock_kernel();
2642         return err;
2643 }
2644
2645 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
2646 {
2647         struct super_block *sb = dentry->d_sb;
2648         struct ext3_sb_info *sbi = EXT3_SB(sb);
2649         struct ext3_super_block *es = sbi->s_es;
2650         u64 fsid;
2651
2652         if (test_opt(sb, MINIX_DF)) {
2653                 sbi->s_overhead_last = 0;
2654         } else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
2655                 unsigned long ngroups = sbi->s_groups_count, i;
2656                 ext3_fsblk_t overhead = 0;
2657                 smp_rmb();
2658
2659                 /*
2660                  * Compute the overhead (FS structures).  This is constant
2661                  * for a given filesystem unless the number of block groups
2662                  * changes so we cache the previous value until it does.
2663                  */
2664
2665                 /*
2666                  * All of the blocks before first_data_block are
2667                  * overhead
2668                  */
2669                 overhead = le32_to_cpu(es->s_first_data_block);
2670
2671                 /*
2672                  * Add the overhead attributed to the superblock and
2673                  * block group descriptors.  If the sparse superblocks
2674                  * feature is turned on, then not all groups have this.
2675                  */
2676                 for (i = 0; i < ngroups; i++) {
2677                         overhead += ext3_bg_has_super(sb, i) +
2678                                 ext3_bg_num_gdb(sb, i);
2679                         cond_resched();
2680                 }
2681
2682                 /*
2683                  * Every block group has an inode bitmap, a block
2684                  * bitmap, and an inode table.
2685                  */
2686                 overhead += ngroups * (2 + sbi->s_itb_per_group);
2687                 sbi->s_overhead_last = overhead;
2688                 smp_wmb();
2689                 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
2690         }
2691
2692         buf->f_type = EXT3_SUPER_MAGIC;
2693         buf->f_bsize = sb->s_blocksize;
2694         buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
2695         buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
2696         buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2697         if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2698                 buf->f_bavail = 0;
2699         buf->f_files = le32_to_cpu(es->s_inodes_count);
2700         buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
2701         buf->f_namelen = EXT3_NAME_LEN;
2702         fsid = le64_to_cpup((void *)es->s_uuid) ^
2703                le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2704         buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2705         buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
2706         return 0;
2707 }
2708
2709 /* Helper function for writing quotas on sync - we need to start transaction before quota file
2710  * is locked for write. Otherwise the are possible deadlocks:
2711  * Process 1                         Process 2
2712  * ext3_create()                     quota_sync()
2713  *   journal_start()                   write_dquot()
2714  *   vfs_dq_init()                       down(dqio_mutex)
2715  *     down(dqio_mutex)                    journal_start()
2716  *
2717  */
2718
2719 #ifdef CONFIG_QUOTA
2720
2721 static inline struct inode *dquot_to_inode(struct dquot *dquot)
2722 {
2723         return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2724 }
2725
2726 static int ext3_write_dquot(struct dquot *dquot)
2727 {
2728         int ret, err;
2729         handle_t *handle;
2730         struct inode *inode;
2731
2732         inode = dquot_to_inode(dquot);
2733         handle = ext3_journal_start(inode,
2734                                         EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2735         if (IS_ERR(handle))
2736                 return PTR_ERR(handle);
2737         ret = dquot_commit(dquot);
2738         err = ext3_journal_stop(handle);
2739         if (!ret)
2740                 ret = err;
2741         return ret;
2742 }
2743
2744 static int ext3_acquire_dquot(struct dquot *dquot)
2745 {
2746         int ret, err;
2747         handle_t *handle;
2748
2749         handle = ext3_journal_start(dquot_to_inode(dquot),
2750                                         EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2751         if (IS_ERR(handle))
2752                 return PTR_ERR(handle);
2753         ret = dquot_acquire(dquot);
2754         err = ext3_journal_stop(handle);
2755         if (!ret)
2756                 ret = err;
2757         return ret;
2758 }
2759
2760 static int ext3_release_dquot(struct dquot *dquot)
2761 {
2762         int ret, err;
2763         handle_t *handle;
2764
2765         handle = ext3_journal_start(dquot_to_inode(dquot),
2766                                         EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2767         if (IS_ERR(handle)) {
2768                 /* Release dquot anyway to avoid endless cycle in dqput() */
2769                 dquot_release(dquot);
2770                 return PTR_ERR(handle);
2771         }
2772         ret = dquot_release(dquot);
2773         err = ext3_journal_stop(handle);
2774         if (!ret)
2775                 ret = err;
2776         return ret;
2777 }
2778
2779 static int ext3_mark_dquot_dirty(struct dquot *dquot)
2780 {
2781         /* Are we journaling quotas? */
2782         if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2783             EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2784                 dquot_mark_dquot_dirty(dquot);
2785                 return ext3_write_dquot(dquot);
2786         } else {
2787                 return dquot_mark_dquot_dirty(dquot);
2788         }
2789 }
2790
2791 static int ext3_write_info(struct super_block *sb, int type)
2792 {
2793         int ret, err;
2794         handle_t *handle;
2795
2796         /* Data block + inode block */
2797         handle = ext3_journal_start(sb->s_root->d_inode, 2);
2798         if (IS_ERR(handle))
2799                 return PTR_ERR(handle);
2800         ret = dquot_commit_info(sb, type);
2801         err = ext3_journal_stop(handle);
2802         if (!ret)
2803                 ret = err;
2804         return ret;
2805 }
2806
2807 /*
2808  * Turn on quotas during mount time - we need to find
2809  * the quota file and such...
2810  */
2811 static int ext3_quota_on_mount(struct super_block *sb, int type)
2812 {
2813         return vfs_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2814                         EXT3_SB(sb)->s_jquota_fmt, type);
2815 }
2816
2817 /*
2818  * Standard function to be called on quota_on
2819  */
2820 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
2821                          char *name, int remount)
2822 {
2823         int err;
2824         struct path path;
2825
2826         if (!test_opt(sb, QUOTA))
2827                 return -EINVAL;
2828         /* When remounting, no checks are needed and in fact, name is NULL */
2829         if (remount)
2830                 return vfs_quota_on(sb, type, format_id, name, remount);
2831
2832         err = kern_path(name, LOOKUP_FOLLOW, &path);
2833         if (err)
2834                 return err;
2835
2836         /* Quotafile not on the same filesystem? */
2837         if (path.mnt->mnt_sb != sb) {
2838                 path_put(&path);
2839                 return -EXDEV;
2840         }
2841         /* Journaling quota? */
2842         if (EXT3_SB(sb)->s_qf_names[type]) {
2843                 /* Quotafile not of fs root? */
2844                 if (path.dentry->d_parent != sb->s_root)
2845                         printk(KERN_WARNING
2846                                 "EXT3-fs: Quota file not on filesystem root. "
2847                                 "Journaled quota will not work.\n");
2848         }
2849
2850         /*
2851          * When we journal data on quota file, we have to flush journal to see
2852          * all updates to the file when we bypass pagecache...
2853          */
2854         if (ext3_should_journal_data(path.dentry->d_inode)) {
2855                 /*
2856                  * We don't need to lock updates but journal_flush() could
2857                  * otherwise be livelocked...
2858                  */
2859                 journal_lock_updates(EXT3_SB(sb)->s_journal);
2860                 err = journal_flush(EXT3_SB(sb)->s_journal);
2861                 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2862                 if (err) {
2863                         path_put(&path);
2864                         return err;
2865                 }
2866         }
2867
2868         err = vfs_quota_on_path(sb, type, format_id, &path);
2869         path_put(&path);
2870         return err;
2871 }
2872
2873 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2874  * acquiring the locks... As quota files are never truncated and quota code
2875  * itself serializes the operations (and noone else should touch the files)
2876  * we don't have to be afraid of races */
2877 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2878                                size_t len, loff_t off)
2879 {
2880         struct inode *inode = sb_dqopt(sb)->files[type];
2881         sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2882         int err = 0;
2883         int offset = off & (sb->s_blocksize - 1);
2884         int tocopy;
2885         size_t toread;
2886         struct buffer_head *bh;
2887         loff_t i_size = i_size_read(inode);
2888
2889         if (off > i_size)
2890                 return 0;
2891         if (off+len > i_size)
2892                 len = i_size-off;
2893         toread = len;
2894         while (toread > 0) {
2895                 tocopy = sb->s_blocksize - offset < toread ?
2896                                 sb->s_blocksize - offset : toread;
2897                 bh = ext3_bread(NULL, inode, blk, 0, &err);
2898                 if (err)
2899                         return err;
2900                 if (!bh)        /* A hole? */
2901                         memset(data, 0, tocopy);
2902                 else
2903                         memcpy(data, bh->b_data+offset, tocopy);
2904                 brelse(bh);
2905                 offset = 0;
2906                 toread -= tocopy;
2907                 data += tocopy;
2908                 blk++;
2909         }
2910         return len;
2911 }
2912
2913 /* Write to quotafile (we know the transaction is already started and has
2914  * enough credits) */
2915 static ssize_t ext3_quota_write(struct super_block *sb, int type,
2916                                 const char *data, 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         int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
2924         size_t towrite = len;
2925         struct buffer_head *bh;
2926         handle_t *handle = journal_current_handle();
2927
2928         if (!handle) {
2929                 printk(KERN_WARNING "EXT3-fs: Quota write (off=%Lu, len=%Lu)"
2930                         " cancelled because transaction is not started.\n",
2931                         (unsigned long long)off, (unsigned long long)len);
2932                 return -EIO;
2933         }
2934         mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2935         while (towrite > 0) {
2936                 tocopy = sb->s_blocksize - offset < towrite ?
2937                                 sb->s_blocksize - offset : towrite;
2938                 bh = ext3_bread(handle, inode, blk, 1, &err);
2939                 if (!bh)
2940                         goto out;
2941                 if (journal_quota) {
2942                         err = ext3_journal_get_write_access(handle, bh);
2943                         if (err) {
2944                                 brelse(bh);
2945                                 goto out;
2946                         }
2947                 }
2948                 lock_buffer(bh);
2949                 memcpy(bh->b_data+offset, data, tocopy);
2950                 flush_dcache_page(bh->b_page);
2951                 unlock_buffer(bh);
2952                 if (journal_quota)
2953                         err = ext3_journal_dirty_metadata(handle, bh);
2954                 else {
2955                         /* Always do at least ordered writes for quotas */
2956                         err = ext3_journal_dirty_data(handle, bh);
2957                         mark_buffer_dirty(bh);
2958                 }
2959                 brelse(bh);
2960                 if (err)
2961                         goto out;
2962                 offset = 0;
2963                 towrite -= tocopy;
2964                 data += tocopy;
2965                 blk++;
2966         }
2967 out:
2968         if (len == towrite) {
2969                 mutex_unlock(&inode->i_mutex);
2970                 return err;
2971         }
2972         if (inode->i_size < off+len-towrite) {
2973                 i_size_write(inode, off+len-towrite);
2974                 EXT3_I(inode)->i_disksize = inode->i_size;
2975         }
2976         inode->i_version++;
2977         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2978         ext3_mark_inode_dirty(handle, inode);
2979         mutex_unlock(&inode->i_mutex);
2980         return len - towrite;
2981 }
2982
2983 #endif
2984
2985 static int ext3_get_sb(struct file_system_type *fs_type,
2986         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
2987 {
2988         return get_sb_bdev(fs_type, flags, dev_name, data, ext3_fill_super, mnt);
2989 }
2990
2991 static struct file_system_type ext3_fs_type = {
2992         .owner          = THIS_MODULE,
2993         .name           = "ext3",
2994         .get_sb         = ext3_get_sb,
2995         .kill_sb        = kill_block_super,
2996         .fs_flags       = FS_REQUIRES_DEV,
2997 };
2998
2999 static int __init init_ext3_fs(void)
3000 {
3001         int err = init_ext3_xattr();
3002         if (err)
3003                 return err;
3004         err = init_inodecache();
3005         if (err)
3006                 goto out1;
3007         err = register_filesystem(&ext3_fs_type);
3008         if (err)
3009                 goto out;
3010         return 0;
3011 out:
3012         destroy_inodecache();
3013 out1:
3014         exit_ext3_xattr();
3015         return err;
3016 }
3017
3018 static void __exit exit_ext3_fs(void)
3019 {
3020         unregister_filesystem(&ext3_fs_type);
3021         destroy_inodecache();
3022         exit_ext3_xattr();
3023 }
3024
3025 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
3026 MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
3027 MODULE_LICENSE("GPL");
3028 module_init(init_ext3_fs)
3029 module_exit(exit_ext3_fs)