fs/ext3/super.c

   1 /*
   2  *  linux/fs/ext3/super.c
   3  *
   4  * Copyright (C) 1992, 1993, 1994, 1995
   5  * Remy Card (card@masi.ibp.fr)
   6  * Laboratoire MASI - Institut Blaise Pascal
   7  * Universite Pierre et Marie Curie (Paris VI)
   8  *
   9  *  from
  10  *
  11  *  linux/fs/minix/inode.c
  12  *
  13  *  Copyright (C) 1991, 1992  Linus Torvalds
  14  *
  15  *  Big-endian to little-endian byte-swapping/bitmaps by
  16  *        David S. Miller (davem@caip.rutgers.edu), 1995
  17  */
  18
  19 #include <linux/module.h>
  20 #include <linux/string.h>
  21 #include <linux/fs.h>
  22 #include <linux/time.h>
  23 #include <linux/jbd.h>
  24 #include <linux/ext3_fs.h>
  25 #include <linux/ext3_jbd.h>
  26 #include <linux/slab.h>
  27 #include <linux/init.h>
  28 #include <linux/blkdev.h>
  29 #include <linux/parser.h>
  30 #include <linux/smp_lock.h>
  31 #include <linux/buffer_head.h>
  32 #include <linux/exportfs.h>
  33 #include <linux/vfs.h>
  34 #include <linux/random.h>
  35 #include <linux/mount.h>
  36 #include <linux/namei.h>
  37 #include <linux/quotaops.h>
  38 #include <linux/seq_file.h>
  39 #include <linux/log2.h>
  40
  41 #include <asm/uaccess.h>
  42
  43 #include "xattr.h"
  44 #include "acl.h"
  45 #include "namei.h"
  46
  47 #ifdef CONFIG_EXT3_DEFAULTS_TO_ORDERED
  48   #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_ORDERED_DATA
  49 #else
  50   #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_WRITEBACK_DATA
  51 #endif
  52
  53 static int ext3_load_journal(struct super_block *, struct ext3_super_block *,
  54                              unsigned long journal_devnum);
  55 static int ext3_create_journal(struct super_block *, struct ext3_super_block *,
  56                                unsigned int);
  57 static int ext3_commit_super(struct super_block *sb,
  58                                struct ext3_super_block *es,
  59                                int sync);
  60 static void ext3_mark_recovery_complete(struct super_block * sb,
  61                                         struct ext3_super_block * es);
  62 static void ext3_clear_journal_err(struct super_block * sb,
  63                                    struct ext3_super_block * es);
  64 static int ext3_sync_fs(struct super_block *sb, int wait);
  65 static const char *ext3_decode_error(struct super_block * sb, int errno,
  66                                      char nbuf[16]);
  67 static int ext3_remount (struct super_block * sb, int * flags, char * data);
  68 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf);
  69 static int ext3_unfreeze(struct super_block *sb);
  70 static int ext3_freeze(struct super_block *sb);
  71
  72 /*
  73  * Wrappers for journal_start/end.
  74  *
  75  * The only special thing we need to do here is to make sure that all
  76  * journal_end calls result in the superblock being marked dirty, so
  77  * that sync() will call the filesystem's write_super callback if
  78  * appropriate.
  79  */
  80 handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks)
  81 {
  82         journal_t *journal;
  83
  84         if (sb->s_flags & MS_RDONLY)
  85                 return ERR_PTR(-EROFS);
  86
  87         /* Special case here: if the journal has aborted behind our
  88          * backs (eg. EIO in the commit thread), then we still need to
  89          * take the FS itself readonly cleanly. */
  90         journal = EXT3_SB(sb)->s_journal;
  91         if (is_journal_aborted(journal)) {
  92                 ext3_abort(sb, __func__,
  93                            "Detected aborted journal");
  94                 return ERR_PTR(-EROFS);
  95         }
  96
  97         return journal_start(journal, nblocks);
  98 }
  99
 100 /*
 101  * The only special thing we need to do here is to make sure that all
 102  * journal_stop calls result in the superblock being marked dirty, so
 103  * that sync() will call the filesystem's write_super callback if
 104  * appropriate.
 105  */
 106 int __ext3_journal_stop(const char *where, handle_t *handle)
 107 {
 108         struct super_block *sb;
 109         int err;
 110         int rc;
 111
 112         sb = handle->h_transaction->t_journal->j_private;
 113         err = handle->h_err;
 114         rc = journal_stop(handle);
 115
 116         if (!err)
 117                 err = rc;
 118         if (err)
 119                 __ext3_std_error(sb, where, err);
 120         return err;
 121 }
 122
 123 void ext3_journal_abort_handle(const char *caller, const char *err_fn,
 124                 struct buffer_head *bh, handle_t *handle, int err)
 125 {
 126         char nbuf[16];
 127         const char *errstr = ext3_decode_error(NULL, err, nbuf);
 128
 129         if (bh)
 130                 BUFFER_TRACE(bh, "abort");
 131
 132         if (!handle->h_err)
 133                 handle->h_err = err;
 134
 135         if (is_handle_aborted(handle))
 136                 return;
 137
 138         printk(KERN_ERR "EXT3-fs: %s: aborting transaction: %s in %s\n",
 139                 caller, errstr, err_fn);
 140
 141         journal_abort_handle(handle);
 142 }
 143
 144 void ext3_msg(struct super_block *sb, const char *prefix,
 145                 const char *fmt, ...)
 146 {
 147         va_list args;
 148
 149         va_start(args, fmt);
 150         printk("%sEXT3-fs (%s): ", prefix, sb->s_id);
 151         vprintk(fmt, args);
 152         printk("\n");
 153         va_end(args);
 154 }
 155
 156 /* Deal with the reporting of failure conditions on a filesystem such as
 157  * inconsistencies detected or read IO failures.
 158  *
 159  * On ext2, we can store the error state of the filesystem in the
 160  * superblock.  That is not possible on ext3, because we may have other
 161  * write ordering constraints on the superblock which prevent us from
 162  * writing it out straight away; and given that the journal is about to
 163  * be aborted, we can't rely on the current, or future, transactions to
 164  * write out the superblock safely.
 165  *
 166  * We'll just use the journal_abort() error code to record an error in
 167  * the journal instead.  On recovery, the journal will complain about
 168  * that error until we've noted it down and cleared it.
 169  */
 170
 171 static void ext3_handle_error(struct super_block *sb)
 172 {
 173         struct ext3_super_block *es = EXT3_SB(sb)->s_es;
 174
 175         EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
 176         es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
 177
 178         if (sb->s_flags & MS_RDONLY)
 179                 return;
 180
 181         if (!test_opt (sb, ERRORS_CONT)) {
 182                 journal_t *journal = EXT3_SB(sb)->s_journal;
 183
 184                 set_opt(EXT3_SB(sb)->s_mount_opt, ABORT);
 185                 if (journal)
 186                         journal_abort(journal, -EIO);
 187         }
 188         if (test_opt (sb, ERRORS_RO)) {
 189                 ext3_msg(sb, KERN_CRIT,
 190                         "error: remounting filesystem read-only");
 191                 sb->s_flags |= MS_RDONLY;
 192         }
 193         ext3_commit_super(sb, es, 1);
 194         if (test_opt(sb, ERRORS_PANIC))
 195                 panic("EXT3-fs (%s): panic forced after error\n",
 196                         sb->s_id);
 197 }
 198
 199 void ext3_error (struct super_block * sb, const char * function,
 200                  const char * fmt, ...)
 201 {
 202         va_list args;
 203
 204         va_start(args, fmt);
 205         printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
 206         vprintk(fmt, args);
 207         printk("\n");
 208         va_end(args);
 209
 210         ext3_handle_error(sb);
 211 }
 212
 213 static const char *ext3_decode_error(struct super_block * sb, int errno,
 214                                      char nbuf[16])
 215 {
 216         char *errstr = NULL;
 217
 218         switch (errno) {
 219         case -EIO:
 220                 errstr = "IO failure";
 221                 break;
 222         case -ENOMEM:
 223                 errstr = "Out of memory";
 224                 break;
 225         case -EROFS:
 226                 if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT)
 227                         errstr = "Journal has aborted";
 228                 else
 229                         errstr = "Readonly filesystem";
 230                 break;
 231         default:
 232                 /* If the caller passed in an extra buffer for unknown
 233                  * errors, textualise them now.  Else we just return
 234                  * NULL. */
 235                 if (nbuf) {
 236                         /* Check for truncated error codes... */
 237                         if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
 238                                 errstr = nbuf;
 239                 }
 240                 break;
 241         }
 242
 243         return errstr;
 244 }
 245
 246 /* __ext3_std_error decodes expected errors from journaling functions
 247  * automatically and invokes the appropriate error response.  */
 248
 249 void __ext3_std_error (struct super_block * sb, const char * function,
 250                        int errno)
 251 {
 252         char nbuf[16];
 253         const char *errstr;
 254
 255         /* Special case: if the error is EROFS, and we're not already
 256          * inside a transaction, then there's really no point in logging
 257          * an error. */
 258         if (errno == -EROFS && journal_current_handle() == NULL &&
 259             (sb->s_flags & MS_RDONLY))
 260                 return;
 261
 262         errstr = ext3_decode_error(sb, errno, nbuf);
 263         ext3_msg(sb, KERN_CRIT, "error in %s: %s", function, errstr);
 264
 265         ext3_handle_error(sb);
 266 }
 267
 268 /*
 269  * ext3_abort is a much stronger failure handler than ext3_error.  The
 270  * abort function may be used to deal with unrecoverable failures such
 271  * as journal IO errors or ENOMEM at a critical moment in log management.
 272  *
 273  * We unconditionally force the filesystem into an ABORT|READONLY state,
 274  * unless the error response on the fs has been set to panic in which
 275  * case we take the easy way out and panic immediately.
 276  */
 277
 278 void ext3_abort (struct super_block * sb, const char * function,
 279                  const char * fmt, ...)
 280 {
 281         va_list args;
 282
 283         va_start(args, fmt);
 284         printk(KERN_CRIT "EXT3-fs (%s): error: %s: ", sb->s_id, function);
 285         vprintk(fmt, args);
 286         printk("\n");
 287         va_end(args);
 288
 289         if (test_opt(sb, ERRORS_PANIC))
 290                 panic("EXT3-fs: panic from previous error\n");
 291
 292         if (sb->s_flags & MS_RDONLY)
 293                 return;
 294
 295         ext3_msg(sb, KERN_CRIT,
 296                 "error: remounting filesystem read-only");
 297         EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
 298         sb->s_flags |= MS_RDONLY;
 299         set_opt(EXT3_SB(sb)->s_mount_opt, ABORT);
 300         if (EXT3_SB(sb)->s_journal)
 301                 journal_abort(EXT3_SB(sb)->s_journal, -EIO);
 302 }
 303
 304 void ext3_warning (struct super_block * sb, const char * function,
 305                    const char * fmt, ...)
 306 {
 307         va_list args;
 308
 309         va_start(args, fmt);
 310         printk(KERN_WARNING "EXT3-fs (%s): warning: %s: ",
 311                sb->s_id, function);
 312         vprintk(fmt, args);
 313         printk("\n");
 314         va_end(args);
 315 }
 316
 317 void ext3_update_dynamic_rev(struct super_block *sb)
 318 {
 319         struct ext3_super_block *es = EXT3_SB(sb)->s_es;
 320
 321         if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
 322                 return;
 323
 324         ext3_msg(sb, KERN_WARNING,
 325                 "warning: updating to rev %d because of "
 326                 "new feature flag, running e2fsck is recommended",
 327                 EXT3_DYNAMIC_REV);
 328
 329         es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO);
 330         es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE);
 331         es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV);
 332         /* leave es->s_feature_*compat flags alone */
 333         /* es->s_uuid will be set by e2fsck if empty */
 334
 335         /*
 336          * The rest of the superblock fields should be zero, and if not it
 337          * means they are likely already in use, so leave them alone.  We
 338          * can leave it up to e2fsck to clean up any inconsistencies there.
 339          */
 340 }
 341
 342 /*
 343  * Open the external journal device
 344  */
 345 static struct block_device *ext3_blkdev_get(dev_t dev, struct super_block *sb)
 346 {
 347         struct block_device *bdev;
 348         char b[BDEVNAME_SIZE];
 349
 350         bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
 351         if (IS_ERR(bdev))
 352                 goto fail;
 353         return bdev;
 354
 355 fail:
 356         ext3_msg(sb, "error: failed to open journal device %s: %ld",
 357                 __bdevname(dev, b), PTR_ERR(bdev));
 358
 359         return NULL;
 360 }
 361
 362 /*
 363  * Release the journal device
 364  */
 365 static int ext3_blkdev_put(struct block_device *bdev)
 366 {
 367         bd_release(bdev);
 368         return blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
 369 }
 370
 371 static int ext3_blkdev_remove(struct ext3_sb_info *sbi)
 372 {
 373         struct block_device *bdev;
 374         int ret = -ENODEV;
 375
 376         bdev = sbi->journal_bdev;
 377         if (bdev) {
 378                 ret = ext3_blkdev_put(bdev);
 379                 sbi->journal_bdev = NULL;
 380         }
 381         return ret;
 382 }
 383
 384 static inline struct inode *orphan_list_entry(struct list_head *l)
 385 {
 386         return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
 387 }
 388
 389 static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
 390 {
 391         struct list_head *l;
 392
 393         ext3_msg(sb, KERN_ERR, "error: sb orphan head is %d",
 394                le32_to_cpu(sbi->s_es->s_last_orphan));
 395
 396         ext3_msg(sb, KERN_ERR, "sb_info orphan list:");
 397         list_for_each(l, &sbi->s_orphan) {
 398                 struct inode *inode = orphan_list_entry(l);
 399                 ext3_msg(sb, KERN_ERR, "  "
 400                        "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
 401                        inode->i_sb->s_id, inode->i_ino, inode,
 402                        inode->i_mode, inode->i_nlink,
 403                        NEXT_ORPHAN(inode));
 404         }
 405 }
 406
 407 static void ext3_put_super (struct super_block * sb)
 408 {
 409         struct ext3_sb_info *sbi = EXT3_SB(sb);
 410         struct ext3_super_block *es = sbi->s_es;
 411         int i, err;
 412
 413         dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
 414
 415         lock_kernel();
 416
 417         ext3_xattr_put_super(sb);
 418         err = journal_destroy(sbi->s_journal);
 419         sbi->s_journal = NULL;
 420         if (err < 0)
 421                 ext3_abort(sb, __func__, "Couldn't clean up the journal");
 422
 423         if (!(sb->s_flags & MS_RDONLY)) {
 424                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
 425                 es->s_state = cpu_to_le16(sbi->s_mount_state);
 426                 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
 427                 mark_buffer_dirty(sbi->s_sbh);
 428                 ext3_commit_super(sb, es, 1);
 429         }
 430
 431         for (i = 0; i < sbi->s_gdb_count; i++)
 432                 brelse(sbi->s_group_desc[i]);
 433         kfree(sbi->s_group_desc);
 434         percpu_counter_destroy(&sbi->s_freeblocks_counter);
 435         percpu_counter_destroy(&sbi->s_freeinodes_counter);
 436         percpu_counter_destroy(&sbi->s_dirs_counter);
 437         brelse(sbi->s_sbh);
 438 #ifdef CONFIG_QUOTA
 439         for (i = 0; i < MAXQUOTAS; i++)
 440                 kfree(sbi->s_qf_names[i]);
 441 #endif
 442
 443         /* Debugging code just in case the in-memory inode orphan list
 444          * isn't empty.  The on-disk one can be non-empty if we've
 445          * detected an error and taken the fs readonly, but the
 446          * in-memory list had better be clean by this point. */
 447         if (!list_empty(&sbi->s_orphan))
 448                 dump_orphan_list(sb, sbi);
 449         J_ASSERT(list_empty(&sbi->s_orphan));
 450
 451         invalidate_bdev(sb->s_bdev);
 452         if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
 453                 /*
 454                  * Invalidate the journal device's buffers.  We don't want them
 455                  * floating about in memory - the physical journal device may
 456                  * hotswapped, and it breaks the `ro-after' testing code.
 457                  */
 458                 sync_blockdev(sbi->journal_bdev);
 459                 invalidate_bdev(sbi->journal_bdev);
 460                 ext3_blkdev_remove(sbi);
 461         }
 462         sb->s_fs_info = NULL;
 463         kfree(sbi->s_blockgroup_lock);
 464         kfree(sbi);
 465
 466         unlock_kernel();
 467 }
 468
 469 static struct kmem_cache *ext3_inode_cachep;
 470
 471 /*
 472  * Called inside transaction, so use GFP_NOFS
 473  */
 474 static struct inode *ext3_alloc_inode(struct super_block *sb)
 475 {
 476         struct ext3_inode_info *ei;
 477
 478         ei = kmem_cache_alloc(ext3_inode_cachep, GFP_NOFS);
 479         if (!ei)
 480                 return NULL;
 481         ei->i_block_alloc_info = NULL;
 482         ei->vfs_inode.i_version = 1;
 483         atomic_set(&ei->i_datasync_tid, 0);
 484         atomic_set(&ei->i_sync_tid, 0);
 485         return &ei->vfs_inode;
 486 }
 487
 488 static void ext3_destroy_inode(struct inode *inode)
 489 {
 490         if (!list_empty(&(EXT3_I(inode)->i_orphan))) {
 491                 printk("EXT3 Inode %p: orphan list check failed!\n",
 492                         EXT3_I(inode));
 493                 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
 494                                 EXT3_I(inode), sizeof(struct ext3_inode_info),
 495                                 false);
 496                 dump_stack();
 497         }
 498         kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
 499 }
 500
 501 static void init_once(void *foo)
 502 {
 503         struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
 504
 505         INIT_LIST_HEAD(&ei->i_orphan);
 506 #ifdef CONFIG_EXT3_FS_XATTR
 507         init_rwsem(&ei->xattr_sem);
 508 #endif
 509         mutex_init(&ei->truncate_mutex);
 510         inode_init_once(&ei->vfs_inode);
 511 }
 512
 513 static int init_inodecache(void)
 514 {
 515         ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
 516                                              sizeof(struct ext3_inode_info),
 517                                              0, (SLAB_RECLAIM_ACCOUNT|
 518                                                 SLAB_MEM_SPREAD),
 519                                              init_once);
 520         if (ext3_inode_cachep == NULL)
 521                 return -ENOMEM;
 522         return 0;
 523 }
 524
 525 static void destroy_inodecache(void)
 526 {
 527         kmem_cache_destroy(ext3_inode_cachep);
 528 }
 529
 530 static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
 531 {
 532 #if defined(CONFIG_QUOTA)
 533         struct ext3_sb_info *sbi = EXT3_SB(sb);
 534
 535         if (sbi->s_jquota_fmt) {
 536                 char *fmtname = "";
 537
 538                 switch (sbi->s_jquota_fmt) {
 539                 case QFMT_VFS_OLD:
 540                         fmtname = "vfsold";
 541                         break;
 542                 case QFMT_VFS_V0:
 543                         fmtname = "vfsv0";
 544                         break;
 545                 case QFMT_VFS_V1:
 546                         fmtname = "vfsv1";
 547                         break;
 548                 }
 549                 seq_printf(seq, ",jqfmt=%s", fmtname);
 550         }
 551
 552         if (sbi->s_qf_names[USRQUOTA])
 553                 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
 554
 555         if (sbi->s_qf_names[GRPQUOTA])
 556                 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
 557
 558         if (test_opt(sb, USRQUOTA))
 559                 seq_puts(seq, ",usrquota");
 560
 561         if (test_opt(sb, GRPQUOTA))
 562                 seq_puts(seq, ",grpquota");
 563 #endif
 564 }
 565
 566 static char *data_mode_string(unsigned long mode)
 567 {
 568         switch (mode) {
 569         case EXT3_MOUNT_JOURNAL_DATA:
 570                 return "journal";
 571         case EXT3_MOUNT_ORDERED_DATA:
 572                 return "ordered";
 573         case EXT3_MOUNT_WRITEBACK_DATA:
 574                 return "writeback";
 575         }
 576         return "unknown";
 577 }
 578
 579 /*
 580  * Show an option if
 581  *  - it's set to a non-default value OR
 582  *  - if the per-sb default is different from the global default
 583  */
 584 static int ext3_show_options(struct seq_file *seq, struct vfsmount *vfs)
 585 {
 586         struct super_block *sb = vfs->mnt_sb;
 587         struct ext3_sb_info *sbi = EXT3_SB(sb);
 588         struct ext3_super_block *es = sbi->s_es;
 589         unsigned long def_mount_opts;
 590
 591         def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
 592
 593         if (sbi->s_sb_block != 1)
 594                 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
 595         if (test_opt(sb, MINIX_DF))
 596                 seq_puts(seq, ",minixdf");
 597         if (test_opt(sb, GRPID))
 598                 seq_puts(seq, ",grpid");
 599         if (!test_opt(sb, GRPID) && (def_mount_opts & EXT3_DEFM_BSDGROUPS))
 600                 seq_puts(seq, ",nogrpid");
 601         if (sbi->s_resuid != EXT3_DEF_RESUID ||
 602             le16_to_cpu(es->s_def_resuid) != EXT3_DEF_RESUID) {
 603                 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
 604         }
 605         if (sbi->s_resgid != EXT3_DEF_RESGID ||
 606             le16_to_cpu(es->s_def_resgid) != EXT3_DEF_RESGID) {
 607                 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
 608         }
 609         if (test_opt(sb, ERRORS_RO)) {
 610                 int def_errors = le16_to_cpu(es->s_errors);
 611
 612                 if (def_errors == EXT3_ERRORS_PANIC ||
 613                     def_errors == EXT3_ERRORS_CONTINUE) {
 614                         seq_puts(seq, ",errors=remount-ro");
 615                 }
 616         }
 617         if (test_opt(sb, ERRORS_CONT))
 618                 seq_puts(seq, ",errors=continue");
 619         if (test_opt(sb, ERRORS_PANIC))
 620                 seq_puts(seq, ",errors=panic");
 621         if (test_opt(sb, NO_UID32))
 622                 seq_puts(seq, ",nouid32");
 623         if (test_opt(sb, DEBUG))
 624                 seq_puts(seq, ",debug");
 625         if (test_opt(sb, OLDALLOC))
 626                 seq_puts(seq, ",oldalloc");
 627 #ifdef CONFIG_EXT3_FS_XATTR
 628         if (test_opt(sb, XATTR_USER))
 629                 seq_puts(seq, ",user_xattr");
 630         if (!test_opt(sb, XATTR_USER) &&
 631             (def_mount_opts & EXT3_DEFM_XATTR_USER)) {
 632                 seq_puts(seq, ",nouser_xattr");
 633         }
 634 #endif
 635 #ifdef CONFIG_EXT3_FS_POSIX_ACL
 636         if (test_opt(sb, POSIX_ACL))
 637                 seq_puts(seq, ",acl");
 638         if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT3_DEFM_ACL))
 639                 seq_puts(seq, ",noacl");
 640 #endif
 641         if (!test_opt(sb, RESERVATION))
 642                 seq_puts(seq, ",noreservation");
 643         if (sbi->s_commit_interval) {
 644                 seq_printf(seq, ",commit=%u",
 645                            (unsigned) (sbi->s_commit_interval / HZ));
 646         }
 647
 648         /*
 649          * Always display barrier state so it's clear what the status is.
 650          */
 651         seq_puts(seq, ",barrier=");
 652         seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
 653         seq_printf(seq, ",data=%s", data_mode_string(test_opt(sb, DATA_FLAGS)));
 654         if (test_opt(sb, DATA_ERR_ABORT))
 655                 seq_puts(seq, ",data_err=abort");
 656
 657         if (test_opt(sb, NOLOAD))
 658                 seq_puts(seq, ",norecovery");
 659
 660         ext3_show_quota_options(seq, sb);
 661
 662         return 0;
 663 }
 664
 665
 666 static struct inode *ext3_nfs_get_inode(struct super_block *sb,
 667                 u64 ino, u32 generation)
 668 {
 669         struct inode *inode;
 670
 671         if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO)
 672                 return ERR_PTR(-ESTALE);
 673         if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count))
 674                 return ERR_PTR(-ESTALE);
 675
 676         /* iget isn't really right if the inode is currently unallocated!!
 677          *
 678          * ext3_read_inode will return a bad_inode if the inode had been
 679          * deleted, so we should be safe.
 680          *
 681          * Currently we don't know the generation for parent directory, so
 682          * a generation of 0 means "accept any"
 683          */
 684         inode = ext3_iget(sb, ino);
 685         if (IS_ERR(inode))
 686                 return ERR_CAST(inode);
 687         if (generation && inode->i_generation != generation) {
 688                 iput(inode);
 689                 return ERR_PTR(-ESTALE);
 690         }
 691
 692         return inode;
 693 }
 694
 695 static struct dentry *ext3_fh_to_dentry(struct super_block *sb, struct fid *fid,
 696                 int fh_len, int fh_type)
 697 {
 698         return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
 699                                     ext3_nfs_get_inode);
 700 }
 701
 702 static struct dentry *ext3_fh_to_parent(struct super_block *sb, struct fid *fid,
 703                 int fh_len, int fh_type)
 704 {
 705         return generic_fh_to_parent(sb, fid, fh_len, fh_type,
 706                                     ext3_nfs_get_inode);
 707 }
 708
 709 /*
 710  * Try to release metadata pages (indirect blocks, directories) which are
 711  * mapped via the block device.  Since these pages could have journal heads
 712  * which would prevent try_to_free_buffers() from freeing them, we must use
 713  * jbd layer's try_to_free_buffers() function to release them.
 714  */
 715 static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
 716                                  gfp_t wait)
 717 {
 718         journal_t *journal = EXT3_SB(sb)->s_journal;
 719
 720         WARN_ON(PageChecked(page));
 721         if (!page_has_buffers(page))
 722                 return 0;
 723         if (journal)
 724                 return journal_try_to_free_buffers(journal, page,
 725                                                    wait & ~__GFP_WAIT);
 726         return try_to_free_buffers(page);
 727 }
 728
 729 #ifdef CONFIG_QUOTA
 730 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
 731 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
 732
 733 static int ext3_write_dquot(struct dquot *dquot);
 734 static int ext3_acquire_dquot(struct dquot *dquot);
 735 static int ext3_release_dquot(struct dquot *dquot);
 736 static int ext3_mark_dquot_dirty(struct dquot *dquot);
 737 static int ext3_write_info(struct super_block *sb, int type);
 738 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
 739                                 char *path);
 740 static int ext3_quota_on_mount(struct super_block *sb, int type);
 741 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
 742                                size_t len, loff_t off);
 743 static ssize_t ext3_quota_write(struct super_block *sb, int type,
 744                                 const char *data, size_t len, loff_t off);
 745
 746 static const struct dquot_operations ext3_quota_operations = {
 747         .write_dquot    = ext3_write_dquot,
 748         .acquire_dquot  = ext3_acquire_dquot,
 749         .release_dquot  = ext3_release_dquot,
 750         .mark_dirty     = ext3_mark_dquot_dirty,
 751         .write_info     = ext3_write_info,
 752         .alloc_dquot    = dquot_alloc,
 753         .destroy_dquot  = dquot_destroy,
 754 };
 755
 756 static const struct quotactl_ops ext3_qctl_operations = {
 757         .quota_on       = ext3_quota_on,
 758         .quota_off      = dquot_quota_off,
 759         .quota_sync     = dquot_quota_sync,
 760         .get_info       = dquot_get_dqinfo,
 761         .set_info       = dquot_set_dqinfo,
 762         .get_dqblk      = dquot_get_dqblk,
 763         .set_dqblk      = dquot_set_dqblk
 764 };
 765 #endif
 766
 767 static const struct super_operations ext3_sops = {
 768         .alloc_inode    = ext3_alloc_inode,
 769         .destroy_inode  = ext3_destroy_inode,
 770         .write_inode    = ext3_write_inode,
 771         .dirty_inode    = ext3_dirty_inode,
 772         .evict_inode    = ext3_evict_inode,
 773         .put_super      = ext3_put_super,
 774         .sync_fs        = ext3_sync_fs,
 775         .freeze_fs      = ext3_freeze,
 776         .unfreeze_fs    = ext3_unfreeze,
 777         .statfs         = ext3_statfs,
 778         .remount_fs     = ext3_remount,
 779         .show_options   = ext3_show_options,
 780 #ifdef CONFIG_QUOTA
 781         .quota_read     = ext3_quota_read,
 782         .quota_write    = ext3_quota_write,
 783 #endif
 784         .bdev_try_to_free_page = bdev_try_to_free_page,
 785 };
 786
 787 static const struct export_operations ext3_export_ops = {
 788         .fh_to_dentry = ext3_fh_to_dentry,
 789         .fh_to_parent = ext3_fh_to_parent,
 790         .get_parent = ext3_get_parent,
 791 };
 792
 793 enum {
 794         Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
 795         Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
 796         Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
 797         Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
 798         Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
 799         Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
 800         Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
 801         Opt_data_err_abort, Opt_data_err_ignore,
 802         Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
 803         Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
 804         Opt_noquota, Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err,
 805         Opt_resize, Opt_usrquota, Opt_grpquota
 806 };
 807
 808 static const match_table_t tokens = {
 809         {Opt_bsd_df, "bsddf"},
 810         {Opt_minix_df, "minixdf"},
 811         {Opt_grpid, "grpid"},
 812         {Opt_grpid, "bsdgroups"},
 813         {Opt_nogrpid, "nogrpid"},
 814         {Opt_nogrpid, "sysvgroups"},
 815         {Opt_resgid, "resgid=%u"},
 816         {Opt_resuid, "resuid=%u"},
 817         {Opt_sb, "sb=%u"},
 818         {Opt_err_cont, "errors=continue"},
 819         {Opt_err_panic, "errors=panic"},
 820         {Opt_err_ro, "errors=remount-ro"},
 821         {Opt_nouid32, "nouid32"},
 822         {Opt_nocheck, "nocheck"},
 823         {Opt_nocheck, "check=none"},
 824         {Opt_debug, "debug"},
 825         {Opt_oldalloc, "oldalloc"},
 826         {Opt_orlov, "orlov"},
 827         {Opt_user_xattr, "user_xattr"},
 828         {Opt_nouser_xattr, "nouser_xattr"},
 829         {Opt_acl, "acl"},
 830         {Opt_noacl, "noacl"},
 831         {Opt_reservation, "reservation"},
 832         {Opt_noreservation, "noreservation"},
 833         {Opt_noload, "noload"},
 834         {Opt_noload, "norecovery"},
 835         {Opt_nobh, "nobh"},
 836         {Opt_bh, "bh"},
 837         {Opt_commit, "commit=%u"},
 838         {Opt_journal_update, "journal=update"},
 839         {Opt_journal_inum, "journal=%u"},
 840         {Opt_journal_dev, "journal_dev=%u"},
 841         {Opt_abort, "abort"},
 842         {Opt_data_journal, "data=journal"},
 843         {Opt_data_ordered, "data=ordered"},
 844         {Opt_data_writeback, "data=writeback"},
 845         {Opt_data_err_abort, "data_err=abort"},
 846         {Opt_data_err_ignore, "data_err=ignore"},
 847         {Opt_offusrjquota, "usrjquota="},
 848         {Opt_usrjquota, "usrjquota=%s"},
 849         {Opt_offgrpjquota, "grpjquota="},
 850         {Opt_grpjquota, "grpjquota=%s"},
 851         {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
 852         {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
 853         {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
 854         {Opt_grpquota, "grpquota"},
 855         {Opt_noquota, "noquota"},
 856         {Opt_quota, "quota"},
 857         {Opt_usrquota, "usrquota"},
 858         {Opt_barrier, "barrier=%u"},
 859         {Opt_barrier, "barrier"},
 860         {Opt_nobarrier, "nobarrier"},
 861         {Opt_resize, "resize"},
 862         {Opt_err, NULL},
 863 };
 864
 865 static ext3_fsblk_t get_sb_block(void **data, struct super_block *sb)
 866 {
 867         ext3_fsblk_t    sb_block;
 868         char            *options = (char *) *data;
 869
 870         if (!options || strncmp(options, "sb=", 3) != 0)
 871                 return 1;       /* Default location */
 872         options += 3;
 873         /*todo: use simple_strtoll with >32bit ext3 */
 874         sb_block = simple_strtoul(options, &options, 0);
 875         if (*options && *options != ',') {
 876                 ext3_msg(sb, "error: invalid sb specification: %s",
 877                        (char *) *data);
 878                 return 1;
 879         }
 880         if (*options == ',')
 881                 options++;
 882         *data = (void *) options;
 883         return sb_block;
 884 }
 885
 886 #ifdef CONFIG_QUOTA
 887 static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
 888 {
 889         struct ext3_sb_info *sbi = EXT3_SB(sb);
 890         char *qname;
 891
 892         if (sb_any_quota_loaded(sb) &&
 893                 !sbi->s_qf_names[qtype]) {
 894                 ext3_msg(sb, KERN_ERR,
 895                         "Cannot change journaled "
 896                         "quota options when quota turned on");
 897                 return 0;
 898         }
 899         qname = match_strdup(args);
 900         if (!qname) {
 901                 ext3_msg(sb, KERN_ERR,
 902                         "Not enough memory for storing quotafile name");
 903                 return 0;
 904         }
 905         if (sbi->s_qf_names[qtype] &&
 906                 strcmp(sbi->s_qf_names[qtype], qname)) {
 907                 ext3_msg(sb, KERN_ERR,
 908                         "%s quota file already specified", QTYPE2NAME(qtype));
 909                 kfree(qname);
 910                 return 0;
 911         }
 912         sbi->s_qf_names[qtype] = qname;
 913         if (strchr(sbi->s_qf_names[qtype], '/')) {
 914                 ext3_msg(sb, KERN_ERR,
 915                         "quotafile must be on filesystem root");
 916                 kfree(sbi->s_qf_names[qtype]);
 917                 sbi->s_qf_names[qtype] = NULL;
 918                 return 0;
 919         }
 920         set_opt(sbi->s_mount_opt, QUOTA);
 921         return 1;
 922 }
 923
 924 static int clear_qf_name(struct super_block *sb, int qtype) {
 925
 926         struct ext3_sb_info *sbi = EXT3_SB(sb);
 927
 928         if (sb_any_quota_loaded(sb) &&
 929                 sbi->s_qf_names[qtype]) {
 930                 ext3_msg(sb, KERN_ERR, "Cannot change journaled quota options"
 931                         " when quota turned on");
 932                 return 0;
 933         }
 934         /*
 935          * The space will be released later when all options are confirmed
 936          * to be correct
 937          */
 938         sbi->s_qf_names[qtype] = NULL;
 939         return 1;
 940 }
 941 #endif
 942
 943 static int parse_options (char *options, struct super_block *sb,
 944                           unsigned int *inum, unsigned long *journal_devnum,
 945                           ext3_fsblk_t *n_blocks_count, int is_remount)
 946 {
 947         struct ext3_sb_info *sbi = EXT3_SB(sb);
 948         char * p;
 949         substring_t args[MAX_OPT_ARGS];
 950         int data_opt = 0;
 951         int option;
 952 #ifdef CONFIG_QUOTA
 953         int qfmt;
 954 #endif
 955
 956         if (!options)
 957                 return 1;
 958
 959         while ((p = strsep (&options, ",")) != NULL) {
 960                 int token;
 961                 if (!*p)
 962                         continue;
 963                 /*
 964                  * Initialize args struct so we know whether arg was
 965                  * found; some options take optional arguments.
 966                  */
 967                 args[0].to = args[0].from = 0;
 968                 token = match_token(p, tokens, args);
 969                 switch (token) {
 970                 case Opt_bsd_df:
 971                         clear_opt (sbi->s_mount_opt, MINIX_DF);
 972                         break;
 973                 case Opt_minix_df:
 974                         set_opt (sbi->s_mount_opt, MINIX_DF);
 975                         break;
 976                 case Opt_grpid:
 977                         set_opt (sbi->s_mount_opt, GRPID);
 978                         break;
 979                 case Opt_nogrpid:
 980                         clear_opt (sbi->s_mount_opt, GRPID);
 981                         break;
 982                 case Opt_resuid:
 983                         if (match_int(&args[0], &option))
 984                                 return 0;
 985                         sbi->s_resuid = option;
 986                         break;
 987                 case Opt_resgid:
 988                         if (match_int(&args[0], &option))
 989                                 return 0;
 990                         sbi->s_resgid = option;
 991                         break;
 992                 case Opt_sb:
 993                         /* handled by get_sb_block() instead of here */
 994                         /* *sb_block = match_int(&args[0]); */
 995                         break;
 996                 case Opt_err_panic:
 997                         clear_opt (sbi->s_mount_opt, ERRORS_CONT);
 998                         clear_opt (sbi->s_mount_opt, ERRORS_RO);
 999                         set_opt (sbi->s_mount_opt, ERRORS_PANIC);
1000                         break;
1001                 case Opt_err_ro:
1002                         clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1003                         clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1004                         set_opt (sbi->s_mount_opt, ERRORS_RO);
1005                         break;
1006                 case Opt_err_cont:
1007                         clear_opt (sbi->s_mount_opt, ERRORS_RO);
1008                         clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1009                         set_opt (sbi->s_mount_opt, ERRORS_CONT);
1010                         break;
1011                 case Opt_nouid32:
1012                         set_opt (sbi->s_mount_opt, NO_UID32);
1013                         break;
1014                 case Opt_nocheck:
1015                         clear_opt (sbi->s_mount_opt, CHECK);
1016                         break;
1017                 case Opt_debug:
1018                         set_opt (sbi->s_mount_opt, DEBUG);
1019                         break;
1020                 case Opt_oldalloc:
1021                         set_opt (sbi->s_mount_opt, OLDALLOC);
1022                         break;
1023                 case Opt_orlov:
1024                         clear_opt (sbi->s_mount_opt, OLDALLOC);
1025                         break;
1026 #ifdef CONFIG_EXT3_FS_XATTR
1027                 case Opt_user_xattr:
1028                         set_opt (sbi->s_mount_opt, XATTR_USER);
1029                         break;
1030                 case Opt_nouser_xattr:
1031                         clear_opt (sbi->s_mount_opt, XATTR_USER);
1032                         break;
1033 #else
1034                 case Opt_user_xattr:
1035                 case Opt_nouser_xattr:
1036                         ext3_msg(sb, KERN_INFO,
1037                                 "(no)user_xattr options not supported");
1038                         break;
1039 #endif
1040 #ifdef CONFIG_EXT3_FS_POSIX_ACL
1041                 case Opt_acl:
1042                         set_opt(sbi->s_mount_opt, POSIX_ACL);
1043                         break;
1044                 case Opt_noacl:
1045                         clear_opt(sbi->s_mount_opt, POSIX_ACL);
1046                         break;
1047 #else
1048                 case Opt_acl:
1049                 case Opt_noacl:
1050                         ext3_msg(sb, KERN_INFO,
1051                                 "(no)acl options not supported");
1052                         break;
1053 #endif
1054                 case Opt_reservation:
1055                         set_opt(sbi->s_mount_opt, RESERVATION);
1056                         break;
1057                 case Opt_noreservation:
1058                         clear_opt(sbi->s_mount_opt, RESERVATION);
1059                         break;
1060                 case Opt_journal_update:
1061                         /* @@@ FIXME */
1062                         /* Eventually we will want to be able to create
1063                            a journal file here.  For now, only allow the
1064                            user to specify an existing inode to be the
1065                            journal file. */
1066                         if (is_remount) {
1067                                 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1068                                         "journal on remount");
1069                                 return 0;
1070                         }
1071                         set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
1072                         break;
1073                 case Opt_journal_inum:
1074                         if (is_remount) {
1075                                 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1076                                        "journal on remount");
1077                                 return 0;
1078                         }
1079                         if (match_int(&args[0], &option))
1080                                 return 0;
1081                         *inum = option;
1082                         break;
1083                 case Opt_journal_dev:
1084                         if (is_remount) {
1085                                 ext3_msg(sb, KERN_ERR, "error: cannot specify "
1086                                        "journal on remount");
1087                                 return 0;
1088                         }
1089                         if (match_int(&args[0], &option))
1090                                 return 0;
1091                         *journal_devnum = option;
1092                         break;
1093                 case Opt_noload:
1094                         set_opt (sbi->s_mount_opt, NOLOAD);
1095                         break;
1096                 case Opt_commit:
1097                         if (match_int(&args[0], &option))
1098                                 return 0;
1099                         if (option < 0)
1100                                 return 0;
1101                         if (option == 0)
1102                                 option = JBD_DEFAULT_MAX_COMMIT_AGE;
1103                         sbi->s_commit_interval = HZ * option;
1104                         break;
1105                 case Opt_data_journal:
1106                         data_opt = EXT3_MOUNT_JOURNAL_DATA;
1107                         goto datacheck;
1108                 case Opt_data_ordered:
1109                         data_opt = EXT3_MOUNT_ORDERED_DATA;
1110                         goto datacheck;
1111                 case Opt_data_writeback:
1112                         data_opt = EXT3_MOUNT_WRITEBACK_DATA;
1113                 datacheck:
1114                         if (is_remount) {
1115                                 if (test_opt(sb, DATA_FLAGS) == data_opt)
1116                                         break;
1117                                 ext3_msg(sb, KERN_ERR,
1118                                         "error: cannot change "
1119                                         "data mode on remount. The filesystem "
1120                                         "is mounted in data=%s mode and you "
1121                                         "try to remount it in data=%s mode.",
1122                                         data_mode_string(test_opt(sb,
1123                                                         DATA_FLAGS)),
1124                                         data_mode_string(data_opt));
1125                                 return 0;
1126                         } else {
1127                                 clear_opt(sbi->s_mount_opt, DATA_FLAGS);
1128                                 sbi->s_mount_opt |= data_opt;
1129                         }
1130                         break;
1131                 case Opt_data_err_abort:
1132                         set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1133                         break;
1134                 case Opt_data_err_ignore:
1135                         clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1136                         break;
1137 #ifdef CONFIG_QUOTA
1138                 case Opt_usrjquota:
1139                         if (!set_qf_name(sb, USRQUOTA, &args[0]))
1140                                 return 0;
1141                         break;
1142                 case Opt_grpjquota:
1143                         if (!set_qf_name(sb, GRPQUOTA, &args[0]))
1144                                 return 0;
1145                         break;
1146                 case Opt_offusrjquota:
1147                         if (!clear_qf_name(sb, USRQUOTA))
1148                                 return 0;
1149                         break;
1150                 case Opt_offgrpjquota:
1151                         if (!clear_qf_name(sb, GRPQUOTA))
1152                                 return 0;
1153                         break;
1154                 case Opt_jqfmt_vfsold:
1155                         qfmt = QFMT_VFS_OLD;
1156                         goto set_qf_format;
1157                 case Opt_jqfmt_vfsv0:
1158                         qfmt = QFMT_VFS_V0;
1159                         goto set_qf_format;
1160                 case Opt_jqfmt_vfsv1:
1161                         qfmt = QFMT_VFS_V1;
1162 set_qf_format:
1163                         if (sb_any_quota_loaded(sb) &&
1164                             sbi->s_jquota_fmt != qfmt) {
1165                                 ext3_msg(sb, KERN_ERR, "error: cannot change "
1166                                         "journaled quota options when "
1167                                         "quota turned on.");
1168                                 return 0;
1169                         }
1170                         sbi->s_jquota_fmt = qfmt;
1171                         break;
1172                 case Opt_quota:
1173                 case Opt_usrquota:
1174                         set_opt(sbi->s_mount_opt, QUOTA);
1175                         set_opt(sbi->s_mount_opt, USRQUOTA);
1176                         break;
1177                 case Opt_grpquota:
1178                         set_opt(sbi->s_mount_opt, QUOTA);
1179                         set_opt(sbi->s_mount_opt, GRPQUOTA);
1180                         break;
1181                 case Opt_noquota:
1182                         if (sb_any_quota_loaded(sb)) {
1183                                 ext3_msg(sb, KERN_ERR, "error: cannot change "
1184                                         "quota options when quota turned on.");
1185                                 return 0;
1186                         }
1187                         clear_opt(sbi->s_mount_opt, QUOTA);
1188                         clear_opt(sbi->s_mount_opt, USRQUOTA);
1189                         clear_opt(sbi->s_mount_opt, GRPQUOTA);
1190                         break;
1191 #else
1192                 case Opt_quota:
1193                 case Opt_usrquota:
1194                 case Opt_grpquota:
1195                         ext3_msg(sb, KERN_ERR,
1196                                 "error: quota options not supported.");
1197                         break;
1198                 case Opt_usrjquota:
1199                 case Opt_grpjquota:
1200                 case Opt_offusrjquota:
1201                 case Opt_offgrpjquota:
1202                 case Opt_jqfmt_vfsold:
1203                 case Opt_jqfmt_vfsv0:
1204                 case Opt_jqfmt_vfsv1:
1205                         ext3_msg(sb, KERN_ERR,
1206                                 "error: journaled quota options not "
1207                                 "supported.");
1208                         break;
1209                 case Opt_noquota:
1210                         break;
1211 #endif
1212                 case Opt_abort:
1213                         set_opt(sbi->s_mount_opt, ABORT);
1214                         break;
1215                 case Opt_nobarrier:
1216                         clear_opt(sbi->s_mount_opt, BARRIER);
1217                         break;
1218                 case Opt_barrier:
1219                         if (args[0].from) {
1220                                 if (match_int(&args[0], &option))
1221                                         return 0;
1222                         } else
1223                                 option = 1;     /* No argument, default to 1 */
1224                         if (option)
1225                                 set_opt(sbi->s_mount_opt, BARRIER);
1226                         else
1227                                 clear_opt(sbi->s_mount_opt, BARRIER);
1228                         break;
1229                 case Opt_ignore:
1230                         break;
1231                 case Opt_resize:
1232                         if (!is_remount) {
1233                                 ext3_msg(sb, KERN_ERR,
1234                                         "error: resize option only available "
1235                                         "for remount");
1236                                 return 0;
1237                         }
1238                         if (match_int(&args[0], &option) != 0)
1239                                 return 0;
1240                         *n_blocks_count = option;
1241                         break;
1242                 case Opt_nobh:
1243                         ext3_msg(sb, KERN_WARNING,
1244                                 "warning: ignoring deprecated nobh option");
1245                         break;
1246                 case Opt_bh:
1247                         ext3_msg(sb, KERN_WARNING,
1248                                 "warning: ignoring deprecated bh option");
1249                         break;
1250                 default:
1251                         ext3_msg(sb, KERN_ERR,
1252                                 "error: unrecognized mount option \"%s\" "
1253                                 "or missing value", p);
1254                         return 0;
1255                 }
1256         }
1257 #ifdef CONFIG_QUOTA
1258         if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1259                 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
1260                         clear_opt(sbi->s_mount_opt, USRQUOTA);
1261                 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
1262                         clear_opt(sbi->s_mount_opt, GRPQUOTA);
1263
1264                 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
1265                         ext3_msg(sb, KERN_ERR, "error: old and new quota "
1266                                         "format mixing.");
1267                         return 0;
1268                 }
1269
1270                 if (!sbi->s_jquota_fmt) {
1271                         ext3_msg(sb, KERN_ERR, "error: journaled quota format "
1272                                         "not specified.");
1273                         return 0;
1274                 }
1275         } else {
1276                 if (sbi->s_jquota_fmt) {
1277                         ext3_msg(sb, KERN_ERR, "error: journaled quota format "
1278                                         "specified with no journaling "
1279                                         "enabled.");
1280                         return 0;
1281                 }
1282         }
1283 #endif
1284         return 1;
1285 }
1286
1287 static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1288                             int read_only)
1289 {
1290         struct ext3_sb_info *sbi = EXT3_SB(sb);
1291         int res = 0;
1292
1293         if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
1294                 ext3_msg(sb, KERN_ERR,
1295                         "error: revision level too high, "
1296                         "forcing read-only mode");
1297                 res = MS_RDONLY;
1298         }
1299         if (read_only)
1300                 return res;
1301         if (!(sbi->s_mount_state & EXT3_VALID_FS))
1302                 ext3_msg(sb, KERN_WARNING,
1303                         "warning: mounting unchecked fs, "
1304                         "running e2fsck is recommended");
1305         else if ((sbi->s_mount_state & EXT3_ERROR_FS))
1306                 ext3_msg(sb, KERN_WARNING,
1307                         "warning: mounting fs with errors, "
1308                         "running e2fsck is recommended");
1309         else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
1310                  le16_to_cpu(es->s_mnt_count) >=
1311                         le16_to_cpu(es->s_max_mnt_count))
1312                 ext3_msg(sb, KERN_WARNING,
1313                         "warning: maximal mount count reached, "
1314                         "running e2fsck is recommended");
1315         else if (le32_to_cpu(es->s_checkinterval) &&
1316                 (le32_to_cpu(es->s_lastcheck) +
1317                         le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1318                 ext3_msg(sb, KERN_WARNING,
1319                         "warning: checktime reached, "
1320                         "running e2fsck is recommended");
1321 #if 0
1322                 /* @@@ We _will_ want to clear the valid bit if we find
1323                    inconsistencies, to force a fsck at reboot.  But for
1324                    a plain journaled filesystem we can keep it set as
1325                    valid forever! :) */
1326         es->s_state &= cpu_to_le16(~EXT3_VALID_FS);
1327 #endif
1328         if (!le16_to_cpu(es->s_max_mnt_count))
1329                 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
1330         le16_add_cpu(&es->s_mnt_count, 1);
1331         es->s_mtime = cpu_to_le32(get_seconds());
1332         ext3_update_dynamic_rev(sb);
1333         EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1334
1335         ext3_commit_super(sb, es, 1);
1336         if (test_opt(sb, DEBUG))
1337                 ext3_msg(sb, KERN_INFO, "[bs=%lu, gc=%lu, "
1338                                 "bpg=%lu, ipg=%lu, mo=%04lx]",
1339                         sb->s_blocksize,
1340                         sbi->s_groups_count,
1341                         EXT3_BLOCKS_PER_GROUP(sb),
1342                         EXT3_INODES_PER_GROUP(sb),
1343                         sbi->s_mount_opt);
1344
1345         if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1346                 char b[BDEVNAME_SIZE];
1347                 ext3_msg(sb, KERN_INFO, "using external journal on %s",
1348                         bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1349         } else {
1350                 ext3_msg(sb, KERN_INFO, "using internal journal");
1351         }
1352         return res;
1353 }
1354
1355 /* Called at mount-time, super-block is locked */
1356 static int ext3_check_descriptors(struct super_block *sb)
1357 {
1358         struct ext3_sb_info *sbi = EXT3_SB(sb);
1359         int i;
1360
1361         ext3_debug ("Checking group descriptors");
1362
1363         for (i = 0; i < sbi->s_groups_count; i++) {
1364                 struct ext3_group_desc *gdp = ext3_get_group_desc(sb, i, NULL);
1365                 ext3_fsblk_t first_block = ext3_group_first_block_no(sb, i);
1366                 ext3_fsblk_t last_block;
1367
1368                 if (i == sbi->s_groups_count - 1)
1369                         last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
1370                 else
1371                         last_block = first_block +
1372                                 (EXT3_BLOCKS_PER_GROUP(sb) - 1);
1373
1374                 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
1375                     le32_to_cpu(gdp->bg_block_bitmap) > last_block)
1376                 {
1377                         ext3_error (sb, "ext3_check_descriptors",
1378                                     "Block bitmap for group %d"
1379                                     " not in group (block %lu)!",
1380                                     i, (unsigned long)
1381                                         le32_to_cpu(gdp->bg_block_bitmap));
1382                         return 0;
1383                 }
1384                 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
1385                     le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
1386                 {
1387                         ext3_error (sb, "ext3_check_descriptors",
1388                                     "Inode bitmap for group %d"
1389                                     " not in group (block %lu)!",
1390                                     i, (unsigned long)
1391                                         le32_to_cpu(gdp->bg_inode_bitmap));
1392                         return 0;
1393                 }
1394                 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
1395                     le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
1396                     last_block)
1397                 {
1398                         ext3_error (sb, "ext3_check_descriptors",
1399                                     "Inode table for group %d"
1400                                     " not in group (block %lu)!",
1401                                     i, (unsigned long)
1402                                         le32_to_cpu(gdp->bg_inode_table));
1403                         return 0;
1404                 }
1405         }
1406
1407         sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1408         sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1409         return 1;
1410 }
1411
1412
1413 /* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1414  * the superblock) which were deleted from all directories, but held open by
1415  * a process at the time of a crash.  We walk the list and try to delete these
1416  * inodes at recovery time (only with a read-write filesystem).
1417  *
1418  * In order to keep the orphan inode chain consistent during traversal (in
1419  * case of crash during recovery), we link each inode into the superblock
1420  * orphan list_head and handle it the same way as an inode deletion during
1421  * normal operation (which journals the operations for us).
1422  *
1423  * We only do an iget() and an iput() on each inode, which is very safe if we
1424  * accidentally point at an in-use or already deleted inode.  The worst that
1425  * can happen in this case is that we get a "bit already cleared" message from
1426  * ext3_free_inode().  The only reason we would point at a wrong inode is if
1427  * e2fsck was run on this filesystem, and it must have already done the orphan
1428  * inode cleanup for us, so we can safely abort without any further action.
1429  */
1430 static void ext3_orphan_cleanup (struct super_block * sb,
1431                                  struct ext3_super_block * es)
1432 {
1433         unsigned int s_flags = sb->s_flags;
1434         int nr_orphans = 0, nr_truncates = 0;
1435 #ifdef CONFIG_QUOTA
1436         int i;
1437 #endif
1438         if (!es->s_last_orphan) {
1439                 jbd_debug(4, "no orphan inodes to clean up\n");
1440                 return;
1441         }
1442
1443         if (bdev_read_only(sb->s_bdev)) {
1444                 ext3_msg(sb, KERN_ERR, "error: write access "
1445                         "unavailable, skipping orphan cleanup.");
1446                 return;
1447         }
1448
1449         if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1450                 if (es->s_last_orphan)
1451                         jbd_debug(1, "Errors on filesystem, "
1452                                   "clearing orphan list.\n");
1453                 es->s_last_orphan = 0;
1454                 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1455                 return;
1456         }
1457
1458         if (s_flags & MS_RDONLY) {
1459                 ext3_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
1460                 sb->s_flags &= ~MS_RDONLY;
1461         }
1462 #ifdef CONFIG_QUOTA
1463         /* Needed for iput() to work correctly and not trash data */
1464         sb->s_flags |= MS_ACTIVE;
1465         /* Turn on quotas so that they are updated correctly */
1466         for (i = 0; i < MAXQUOTAS; i++) {
1467                 if (EXT3_SB(sb)->s_qf_names[i]) {
1468                         int ret = ext3_quota_on_mount(sb, i);
1469                         if (ret < 0)
1470                                 ext3_msg(sb, KERN_ERR,
1471                                         "error: cannot turn on journaled "
1472                                         "quota: %d", ret);
1473                 }
1474         }
1475 #endif
1476
1477         while (es->s_last_orphan) {
1478                 struct inode *inode;
1479
1480                 inode = ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1481                 if (IS_ERR(inode)) {
1482                         es->s_last_orphan = 0;
1483                         break;
1484                 }
1485
1486                 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1487                 dquot_initialize(inode);
1488                 if (inode->i_nlink) {
1489                         printk(KERN_DEBUG
1490                                 "%s: truncating inode %lu to %Ld bytes\n",
1491                                 __func__, inode->i_ino, inode->i_size);
1492                         jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1493                                   inode->i_ino, inode->i_size);
1494                         ext3_truncate(inode);
1495                         nr_truncates++;
1496                 } else {
1497                         printk(KERN_DEBUG
1498                                 "%s: deleting unreferenced inode %lu\n",
1499                                 __func__, inode->i_ino);
1500                         jbd_debug(2, "deleting unreferenced inode %lu\n",
1501                                   inode->i_ino);
1502                         nr_orphans++;
1503                 }
1504                 iput(inode);  /* The delete magic happens here! */
1505         }
1506
1507 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1508
1509         if (nr_orphans)
1510                 ext3_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
1511                        PLURAL(nr_orphans));
1512         if (nr_truncates)
1513                 ext3_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
1514                        PLURAL(nr_truncates));
1515 #ifdef CONFIG_QUOTA
1516         /* Turn quotas off */
1517         for (i = 0; i < MAXQUOTAS; i++) {
1518                 if (sb_dqopt(sb)->files[i])
1519                         dquot_quota_off(sb, i);
1520         }
1521 #endif
1522         sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1523 }
1524
1525 /*
1526  * Maximal file size.  There is a direct, and {,double-,triple-}indirect
1527  * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1528  * We need to be 1 filesystem block less than the 2^32 sector limit.
1529  */
1530 static loff_t ext3_max_size(int bits)
1531 {
1532         loff_t res = EXT3_NDIR_BLOCKS;
1533         int meta_blocks;
1534         loff_t upper_limit;
1535
1536         /* This is calculated to be the largest file size for a
1537          * dense, file such that the total number of
1538          * sectors in the file, including data and all indirect blocks,
1539          * does not exceed 2^32 -1
1540          * __u32 i_blocks representing the total number of
1541          * 512 bytes blocks of the file
1542          */
1543         upper_limit = (1LL << 32) - 1;
1544
1545         /* total blocks in file system block size */
1546         upper_limit >>= (bits - 9);
1547
1548
1549         /* indirect blocks */
1550         meta_blocks = 1;
1551         /* double indirect blocks */
1552         meta_blocks += 1 + (1LL << (bits-2));
1553         /* tripple indirect blocks */
1554         meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1555
1556         upper_limit -= meta_blocks;
1557         upper_limit <<= bits;
1558
1559         res += 1LL << (bits-2);
1560         res += 1LL << (2*(bits-2));
1561         res += 1LL << (3*(bits-2));
1562         res <<= bits;
1563         if (res > upper_limit)
1564                 res = upper_limit;
1565
1566         if (res > MAX_LFS_FILESIZE)
1567                 res = MAX_LFS_FILESIZE;
1568
1569         return res;
1570 }
1571
1572 static ext3_fsblk_t descriptor_loc(struct super_block *sb,
1573                                     ext3_fsblk_t logic_sb_block,
1574                                     int nr)
1575 {
1576         struct ext3_sb_info *sbi = EXT3_SB(sb);
1577         unsigned long bg, first_meta_bg;
1578         int has_super = 0;
1579
1580         first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1581
1582         if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1583             nr < first_meta_bg)
1584                 return (logic_sb_block + nr + 1);
1585         bg = sbi->s_desc_per_block * nr;
1586         if (ext3_bg_has_super(sb, bg))
1587                 has_super = 1;
1588         return (has_super + ext3_group_first_block_no(sb, bg));
1589 }
1590
1591
1592 static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1593 {
1594         struct buffer_head * bh;
1595         struct ext3_super_block *es = NULL;
1596         struct ext3_sb_info *sbi;
1597         ext3_fsblk_t block;
1598         ext3_fsblk_t sb_block = get_sb_block(&data, sb);
1599         ext3_fsblk_t logic_sb_block;
1600         unsigned long offset = 0;
1601         unsigned int journal_inum = 0;
1602         unsigned long journal_devnum = 0;
1603         unsigned long def_mount_opts;
1604         struct inode *root;
1605         int blocksize;
1606         int hblock;
1607         int db_count;
1608         int i;
1609         int needs_recovery;
1610         int ret = -EINVAL;
1611         __le32 features;
1612         int err;
1613
1614         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1615         if (!sbi)
1616                 return -ENOMEM;
1617
1618         sbi->s_blockgroup_lock =
1619                 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
1620         if (!sbi->s_blockgroup_lock) {
1621                 kfree(sbi);
1622                 return -ENOMEM;
1623         }
1624         sb->s_fs_info = sbi;
1625         sbi->s_mount_opt = 0;
1626         sbi->s_resuid = EXT3_DEF_RESUID;
1627         sbi->s_resgid = EXT3_DEF_RESGID;
1628         sbi->s_sb_block = sb_block;
1629
1630         unlock_kernel();
1631
1632         blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1633         if (!blocksize) {
1634                 ext3_msg(sb, KERN_ERR, "error: unable to set blocksize");
1635                 goto out_fail;
1636         }
1637
1638         /*
1639          * The ext3 superblock will not be buffer aligned for other than 1kB
1640          * block sizes.  We need to calculate the offset from buffer start.
1641          */
1642         if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1643                 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1644                 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1645         } else {
1646                 logic_sb_block = sb_block;
1647         }
1648
1649         if (!(bh = sb_bread(sb, logic_sb_block))) {
1650                 ext3_msg(sb, KERN_ERR, "error: unable to read superblock");
1651                 goto out_fail;
1652         }
1653         /*
1654          * Note: s_es must be initialized as soon as possible because
1655          *       some ext3 macro-instructions depend on its value
1656          */
1657         es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1658         sbi->s_es = es;
1659         sb->s_magic = le16_to_cpu(es->s_magic);
1660         if (sb->s_magic != EXT3_SUPER_MAGIC)
1661                 goto cantfind_ext3;
1662
1663         /* Set defaults before we parse the mount options */
1664         def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1665         if (def_mount_opts & EXT3_DEFM_DEBUG)
1666                 set_opt(sbi->s_mount_opt, DEBUG);
1667         if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1668                 set_opt(sbi->s_mount_opt, GRPID);
1669         if (def_mount_opts & EXT3_DEFM_UID16)
1670                 set_opt(sbi->s_mount_opt, NO_UID32);
1671 #ifdef CONFIG_EXT3_FS_XATTR
1672         if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1673                 set_opt(sbi->s_mount_opt, XATTR_USER);
1674 #endif
1675 #ifdef CONFIG_EXT3_FS_POSIX_ACL
1676         if (def_mount_opts & EXT3_DEFM_ACL)
1677                 set_opt(sbi->s_mount_opt, POSIX_ACL);
1678 #endif
1679         if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1680                 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1681         else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1682                 set_opt(sbi->s_mount_opt, ORDERED_DATA);
1683         else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1684                 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
1685
1686         if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1687                 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1688         else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_CONTINUE)
1689                 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1690         else
1691                 set_opt(sbi->s_mount_opt, ERRORS_RO);
1692
1693         sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1694         sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1695
1696         set_opt(sbi->s_mount_opt, RESERVATION);
1697
1698         if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1699                             NULL, 0))
1700                 goto failed_mount;
1701
1702         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1703                 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
1704
1705         if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1706             (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1707              EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1708              EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1709                 ext3_msg(sb, KERN_WARNING,
1710                         "warning: feature flags set on rev 0 fs, "
1711                         "running e2fsck is recommended");
1712         /*
1713          * Check feature flags regardless of the revision level, since we
1714          * previously didn't change the revision level when setting the flags,
1715          * so there is a chance incompat flags are set on a rev 0 filesystem.
1716          */
1717         features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1718         if (features) {
1719                 ext3_msg(sb, KERN_ERR,
1720                         "error: couldn't mount because of unsupported "
1721                         "optional features (%x)", le32_to_cpu(features));
1722                 goto failed_mount;
1723         }
1724         features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1725         if (!(sb->s_flags & MS_RDONLY) && features) {
1726                 ext3_msg(sb, KERN_ERR,
1727                         "error: couldn't mount RDWR because of unsupported "
1728                         "optional features (%x)", le32_to_cpu(features));
1729                 goto failed_mount;
1730         }
1731         blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1732
1733         if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1734             blocksize > EXT3_MAX_BLOCK_SIZE) {
1735                 ext3_msg(sb, KERN_ERR,
1736                         "error: couldn't mount because of unsupported "
1737                         "filesystem blocksize %d", blocksize);
1738                 goto failed_mount;
1739         }
1740
1741         hblock = bdev_logical_block_size(sb->s_bdev);
1742         if (sb->s_blocksize != blocksize) {
1743                 /*
1744                  * Make sure the blocksize for the filesystem is larger
1745                  * than the hardware sectorsize for the machine.
1746                  */
1747                 if (blocksize < hblock) {
1748                         ext3_msg(sb, KERN_ERR,
1749                                 "error: fsblocksize %d too small for "
1750                                 "hardware sectorsize %d", blocksize, hblock);
1751                         goto failed_mount;
1752                 }
1753
1754                 brelse (bh);
1755                 if (!sb_set_blocksize(sb, blocksize)) {
1756                         ext3_msg(sb, KERN_ERR,
1757                                 "error: bad blocksize %d", blocksize);
1758                         goto out_fail;
1759                 }
1760                 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1761                 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1762                 bh = sb_bread(sb, logic_sb_block);
1763                 if (!bh) {
1764                         ext3_msg(sb, KERN_ERR,
1765                                "error: can't read superblock on 2nd try");
1766                         goto failed_mount;
1767                 }
1768                 es = (struct ext3_super_block *)(((char *)bh->b_data) + offset);
1769                 sbi->s_es = es;
1770                 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
1771                         ext3_msg(sb, KERN_ERR,
1772                                 "error: magic mismatch");
1773                         goto failed_mount;
1774                 }
1775         }
1776
1777         sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1778
1779         if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1780                 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1781                 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1782         } else {
1783                 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1784                 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1785                 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
1786                     (!is_power_of_2(sbi->s_inode_size)) ||
1787                     (sbi->s_inode_size > blocksize)) {
1788                         ext3_msg(sb, KERN_ERR,
1789                                 "error: unsupported inode size: %d",
1790                                 sbi->s_inode_size);
1791                         goto failed_mount;
1792                 }
1793         }
1794         sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1795                                    le32_to_cpu(es->s_log_frag_size);
1796         if (blocksize != sbi->s_frag_size) {
1797                 ext3_msg(sb, KERN_ERR,
1798                        "error: fragsize %lu != blocksize %u (unsupported)",
1799                        sbi->s_frag_size, blocksize);
1800                 goto failed_mount;
1801         }
1802         sbi->s_frags_per_block = 1;
1803         sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1804         sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1805         sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1806         if (EXT3_INODE_SIZE(sb) == 0 || EXT3_INODES_PER_GROUP(sb) == 0)
1807                 goto cantfind_ext3;
1808         sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1809         if (sbi->s_inodes_per_block == 0)
1810                 goto cantfind_ext3;
1811         sbi->s_itb_per_group = sbi->s_inodes_per_group /
1812                                         sbi->s_inodes_per_block;
1813         sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1814         sbi->s_sbh = bh;
1815         sbi->s_mount_state = le16_to_cpu(es->s_state);
1816         sbi->s_addr_per_block_bits = ilog2(EXT3_ADDR_PER_BLOCK(sb));
1817         sbi->s_desc_per_block_bits = ilog2(EXT3_DESC_PER_BLOCK(sb));
1818         for (i=0; i < 4; i++)
1819                 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1820         sbi->s_def_hash_version = es->s_def_hash_version;
1821         i = le32_to_cpu(es->s_flags);
1822         if (i & EXT2_FLAGS_UNSIGNED_HASH)
1823                 sbi->s_hash_unsigned = 3;
1824         else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
1825 #ifdef __CHAR_UNSIGNED__
1826                 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
1827                 sbi->s_hash_unsigned = 3;
1828 #else
1829                 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
1830 #endif
1831         }
1832
1833         if (sbi->s_blocks_per_group > blocksize * 8) {
1834                 ext3_msg(sb, KERN_ERR,
1835                         "#blocks per group too big: %lu",
1836                         sbi->s_blocks_per_group);
1837                 goto failed_mount;
1838         }
1839         if (sbi->s_frags_per_group > blocksize * 8) {
1840                 ext3_msg(sb, KERN_ERR,
1841                         "error: #fragments per group too big: %lu",
1842                         sbi->s_frags_per_group);
1843                 goto failed_mount;
1844         }
1845         if (sbi->s_inodes_per_group > blocksize * 8) {
1846                 ext3_msg(sb, KERN_ERR,
1847                         "error: #inodes per group too big: %lu",
1848                         sbi->s_inodes_per_group);
1849                 goto failed_mount;
1850         }
1851
1852         if (le32_to_cpu(es->s_blocks_count) >
1853                     (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
1854                 ext3_msg(sb, KERN_ERR,
1855                         "error: filesystem is too large to mount safely");
1856                 if (sizeof(sector_t) < 8)
1857                         ext3_msg(sb, KERN_ERR,
1858                                 "error: CONFIG_LBDAF not enabled");
1859                 goto failed_mount;
1860         }
1861
1862         if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1863                 goto cantfind_ext3;
1864         sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1865                                le32_to_cpu(es->s_first_data_block) - 1)
1866                                        / EXT3_BLOCKS_PER_GROUP(sb)) + 1;
1867         db_count = (sbi->s_groups_count + EXT3_DESC_PER_BLOCK(sb) - 1) /
1868                    EXT3_DESC_PER_BLOCK(sb);
1869         sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1870                                     GFP_KERNEL);
1871         if (sbi->s_group_desc == NULL) {
1872                 ext3_msg(sb, KERN_ERR,
1873                         "error: not enough memory");
1874                 goto failed_mount;
1875         }
1876
1877         bgl_lock_init(sbi->s_blockgroup_lock);
1878
1879         for (i = 0; i < db_count; i++) {
1880                 block = descriptor_loc(sb, logic_sb_block, i);
1881                 sbi->s_group_desc[i] = sb_bread(sb, block);
1882                 if (!sbi->s_group_desc[i]) {
1883                         ext3_msg(sb, KERN_ERR,
1884                                 "error: can't read group descriptor %d", i);
1885                         db_count = i;
1886                         goto failed_mount2;
1887                 }
1888         }
1889         if (!ext3_check_descriptors (sb)) {
1890                 ext3_msg(sb, KERN_ERR,
1891                         "error: group descriptors corrupted");
1892                 goto failed_mount2;
1893         }
1894         sbi->s_gdb_count = db_count;
1895         get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1896         spin_lock_init(&sbi->s_next_gen_lock);
1897
1898         /* per fileystem reservation list head & lock */
1899         spin_lock_init(&sbi->s_rsv_window_lock);
1900         sbi->s_rsv_window_root = RB_ROOT;
1901         /* Add a single, static dummy reservation to the start of the
1902          * reservation window list --- it gives us a placeholder for
1903          * append-at-start-of-list which makes the allocation logic
1904          * _much_ simpler. */
1905         sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1906         sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1907         sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1908         sbi->s_rsv_window_head.rsv_goal_size = 0;
1909         ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1910
1911         /*
1912          * set up enough so that it can read an inode
1913          */
1914         sb->s_op = &ext3_sops;
1915         sb->s_export_op = &ext3_export_ops;
1916         sb->s_xattr = ext3_xattr_handlers;
1917 #ifdef CONFIG_QUOTA
1918         sb->s_qcop = &ext3_qctl_operations;
1919         sb->dq_op = &ext3_quota_operations;
1920 #endif
1921         INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1922         mutex_init(&sbi->s_orphan_lock);
1923         mutex_init(&sbi->s_resize_lock);
1924
1925         sb->s_root = NULL;
1926
1927         needs_recovery = (es->s_last_orphan != 0 ||
1928                           EXT3_HAS_INCOMPAT_FEATURE(sb,
1929                                     EXT3_FEATURE_INCOMPAT_RECOVER));
1930
1931         /*
1932          * The first inode we look at is the journal inode.  Don't try
1933          * root first: it may be modified in the journal!
1934          */
1935         if (!test_opt(sb, NOLOAD) &&
1936             EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
1937                 if (ext3_load_journal(sb, es, journal_devnum))
1938                         goto failed_mount2;
1939         } else if (journal_inum) {
1940                 if (ext3_create_journal(sb, es, journal_inum))
1941                         goto failed_mount2;
1942         } else {
1943                 if (!silent)
1944                         ext3_msg(sb, KERN_ERR,
1945                                 "error: no journal found. "
1946                                 "mounting ext3 over ext2?");
1947                 goto failed_mount2;
1948         }
1949         err = percpu_counter_init(&sbi->s_freeblocks_counter,
1950                         ext3_count_free_blocks(sb));
1951         if (!err) {
1952                 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1953                                 ext3_count_free_inodes(sb));
1954         }
1955         if (!err) {
1956                 err = percpu_counter_init(&sbi->s_dirs_counter,
1957                                 ext3_count_dirs(sb));
1958         }
1959         if (err) {
1960                 ext3_msg(sb, KERN_ERR, "error: insufficient memory");
1961                 goto failed_mount3;
1962         }
1963
1964         /* We have now updated the journal if required, so we can
1965          * validate the data journaling mode. */
1966         switch (test_opt(sb, DATA_FLAGS)) {
1967         case 0:
1968                 /* No mode set, assume a default based on the journal
1969                    capabilities: ORDERED_DATA if the journal can
1970                    cope, else JOURNAL_DATA */
1971                 if (journal_check_available_features
1972                     (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
1973                         set_opt(sbi->s_mount_opt, DEFAULT_DATA_MODE);
1974                 else
1975                         set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1976                 break;
1977
1978         case EXT3_MOUNT_ORDERED_DATA:
1979         case EXT3_MOUNT_WRITEBACK_DATA:
1980                 if (!journal_check_available_features
1981                     (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
1982                         ext3_msg(sb, KERN_ERR,
1983                                 "error: journal does not support "
1984                                 "requested data journaling mode");
1985                         goto failed_mount3;
1986                 }
1987         default:
1988                 break;
1989         }
1990
1991         /*
1992          * The journal_load will have done any necessary log recovery,
1993          * so we can safely mount the rest of the filesystem now.
1994          */
1995
1996         root = ext3_iget(sb, EXT3_ROOT_INO);
1997         if (IS_ERR(root)) {
1998                 ext3_msg(sb, KERN_ERR, "error: get root inode failed");
1999                 ret = PTR_ERR(root);
2000                 goto failed_mount3;
2001         }
2002         if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
2003                 iput(root);
2004                 ext3_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck");
2005                 goto failed_mount3;
2006         }
2007         sb->s_root = d_alloc_root(root);
2008         if (!sb->s_root) {
2009                 ext3_msg(sb, KERN_ERR, "error: get root dentry failed");
2010                 iput(root);
2011                 ret = -ENOMEM;
2012                 goto failed_mount3;
2013         }
2014
2015         ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
2016
2017         EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
2018         ext3_orphan_cleanup(sb, es);
2019         EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
2020         if (needs_recovery)
2021                 ext3_msg(sb, KERN_INFO, "recovery complete");
2022         ext3_mark_recovery_complete(sb, es);
2023         ext3_msg(sb, KERN_INFO, "mounted filesystem with %s data mode",
2024                 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
2025                 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
2026                 "writeback");
2027
2028         lock_kernel();
2029         return 0;
2030
2031 cantfind_ext3:
2032         if (!silent)
2033                 ext3_msg(sb, KERN_INFO,
2034                         "error: can't find ext3 filesystem on dev %s.",
2035                        sb->s_id);
2036         goto failed_mount;
2037
2038 failed_mount3:
2039         percpu_counter_destroy(&sbi->s_freeblocks_counter);
2040         percpu_counter_destroy(&sbi->s_freeinodes_counter);
2041         percpu_counter_destroy(&sbi->s_dirs_counter);
2042         journal_destroy(sbi->s_journal);
2043 failed_mount2:
2044         for (i = 0; i < db_count; i++)
2045                 brelse(sbi->s_group_desc[i]);
2046         kfree(sbi->s_group_desc);
2047 failed_mount:
2048 #ifdef CONFIG_QUOTA
2049         for (i = 0; i < MAXQUOTAS; i++)
2050                 kfree(sbi->s_qf_names[i]);
2051 #endif
2052         ext3_blkdev_remove(sbi);
2053         brelse(bh);
2054 out_fail:
2055         sb->s_fs_info = NULL;
2056         kfree(sbi->s_blockgroup_lock);
2057         kfree(sbi);
2058         lock_kernel();
2059         return ret;
2060 }
2061
2062 /*
2063  * Setup any per-fs journal parameters now.  We'll do this both on
2064  * initial mount, once the journal has been initialised but before we've
2065  * done any recovery; and again on any subsequent remount.
2066  */
2067 static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
2068 {
2069         struct ext3_sb_info *sbi = EXT3_SB(sb);
2070
2071         if (sbi->s_commit_interval)
2072                 journal->j_commit_interval = sbi->s_commit_interval;
2073         /* We could also set up an ext3-specific default for the commit
2074          * interval here, but for now we'll just fall back to the jbd
2075          * default. */
2076
2077         spin_lock(&journal->j_state_lock);
2078         if (test_opt(sb, BARRIER))
2079                 journal->j_flags |= JFS_BARRIER;
2080         else
2081                 journal->j_flags &= ~JFS_BARRIER;
2082         if (test_opt(sb, DATA_ERR_ABORT))
2083                 journal->j_flags |= JFS_ABORT_ON_SYNCDATA_ERR;
2084         else
2085                 journal->j_flags &= ~JFS_ABORT_ON_SYNCDATA_ERR;
2086         spin_unlock(&journal->j_state_lock);
2087 }
2088
2089 static journal_t *ext3_get_journal(struct super_block *sb,
2090                                    unsigned int journal_inum)
2091 {
2092         struct inode *journal_inode;
2093         journal_t *journal;
2094
2095         /* First, test for the existence of a valid inode on disk.  Bad
2096          * things happen if we iget() an unused inode, as the subsequent
2097          * iput() will try to delete it. */
2098
2099         journal_inode = ext3_iget(sb, journal_inum);
2100         if (IS_ERR(journal_inode)) {
2101                 ext3_msg(sb, KERN_ERR, "error: no journal found");
2102                 return NULL;
2103         }
2104         if (!journal_inode->i_nlink) {
2105                 make_bad_inode(journal_inode);
2106                 iput(journal_inode);
2107                 ext3_msg(sb, KERN_ERR, "error: journal inode is deleted");
2108                 return NULL;
2109         }
2110
2111         jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2112                   journal_inode, journal_inode->i_size);
2113         if (!S_ISREG(journal_inode->i_mode)) {
2114                 ext3_msg(sb, KERN_ERR, "error: invalid journal inode");
2115                 iput(journal_inode);
2116                 return NULL;
2117         }
2118
2119         journal = journal_init_inode(journal_inode);
2120         if (!journal) {
2121                 ext3_msg(sb, KERN_ERR, "error: could not load journal inode");
2122                 iput(journal_inode);
2123                 return NULL;
2124         }
2125         journal->j_private = sb;
2126         ext3_init_journal_params(sb, journal);
2127         return journal;
2128 }
2129
2130 static journal_t *ext3_get_dev_journal(struct super_block *sb,
2131                                        dev_t j_dev)
2132 {
2133         struct buffer_head * bh;
2134         journal_t *journal;
2135         ext3_fsblk_t start;
2136         ext3_fsblk_t len;
2137         int hblock, blocksize;
2138         ext3_fsblk_t sb_block;
2139         unsigned long offset;
2140         struct ext3_super_block * es;
2141         struct block_device *bdev;
2142
2143         bdev = ext3_blkdev_get(j_dev, sb);
2144         if (bdev == NULL)
2145                 return NULL;
2146
2147         if (bd_claim(bdev, sb)) {
2148                 ext3_msg(sb, KERN_ERR,
2149                         "error: failed to claim external journal device");
2150                 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
2151                 return NULL;
2152         }
2153
2154         blocksize = sb->s_blocksize;
2155         hblock = bdev_logical_block_size(bdev);
2156         if (blocksize < hblock) {
2157                 ext3_msg(sb, KERN_ERR,
2158                         "error: blocksize too small for journal device");
2159                 goto out_bdev;
2160         }
2161
2162         sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
2163         offset = EXT3_MIN_BLOCK_SIZE % blocksize;
2164         set_blocksize(bdev, blocksize);
2165         if (!(bh = __bread(bdev, sb_block, blocksize))) {
2166                 ext3_msg(sb, KERN_ERR, "error: couldn't read superblock of "
2167                         "external journal");
2168                 goto out_bdev;
2169         }
2170
2171         es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
2172         if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
2173             !(le32_to_cpu(es->s_feature_incompat) &
2174               EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2175                 ext3_msg(sb, KERN_ERR, "error: external journal has "
2176                         "bad superblock");
2177                 brelse(bh);
2178                 goto out_bdev;
2179         }
2180
2181         if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2182                 ext3_msg(sb, KERN_ERR, "error: journal UUID does not match");
2183                 brelse(bh);
2184                 goto out_bdev;
2185         }
2186
2187         len = le32_to_cpu(es->s_blocks_count);
2188         start = sb_block + 1;
2189         brelse(bh);     /* we're done with the superblock */
2190
2191         journal = journal_init_dev(bdev, sb->s_bdev,
2192                                         start, len, blocksize);
2193         if (!journal) {
2194                 ext3_msg(sb, KERN_ERR,
2195                         "error: failed to create device journal");
2196                 goto out_bdev;
2197         }
2198         journal->j_private = sb;
2199         ll_rw_block(READ, 1, &journal->j_sb_buffer);
2200         wait_on_buffer(journal->j_sb_buffer);
2201         if (!buffer_uptodate(journal->j_sb_buffer)) {
2202                 ext3_msg(sb, KERN_ERR, "I/O error on journal device");
2203                 goto out_journal;
2204         }
2205         if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
2206                 ext3_msg(sb, KERN_ERR,
2207                         "error: external journal has more than one "
2208                         "user (unsupported) - %d",
2209                         be32_to_cpu(journal->j_superblock->s_nr_users));
2210                 goto out_journal;
2211         }
2212         EXT3_SB(sb)->journal_bdev = bdev;
2213         ext3_init_journal_params(sb, journal);
2214         return journal;
2215 out_journal:
2216         journal_destroy(journal);
2217 out_bdev:
2218         ext3_blkdev_put(bdev);
2219         return NULL;
2220 }
2221
2222 static int ext3_load_journal(struct super_block *sb,
2223                              struct ext3_super_block *es,
2224                              unsigned long journal_devnum)
2225 {
2226         journal_t *journal;
2227         unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2228         dev_t journal_dev;
2229         int err = 0;
2230         int really_read_only;
2231
2232         if (journal_devnum &&
2233             journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2234                 ext3_msg(sb, KERN_INFO, "external journal device major/minor "
2235                         "numbers have changed");
2236                 journal_dev = new_decode_dev(journal_devnum);
2237         } else
2238                 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2239
2240         really_read_only = bdev_read_only(sb->s_bdev);
2241
2242         /*
2243          * Are we loading a blank journal or performing recovery after a
2244          * crash?  For recovery, we need to check in advance whether we
2245          * can get read-write access to the device.
2246          */
2247
2248         if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
2249                 if (sb->s_flags & MS_RDONLY) {
2250                         ext3_msg(sb, KERN_INFO,
2251                                 "recovery required on readonly filesystem");
2252                         if (really_read_only) {
2253                                 ext3_msg(sb, KERN_ERR, "error: write access "
2254                                         "unavailable, cannot proceed");
2255                                 return -EROFS;
2256                         }
2257                         ext3_msg(sb, KERN_INFO,
2258                                 "write access will be enabled during recovery");
2259                 }
2260         }
2261
2262         if (journal_inum && journal_dev) {
2263                 ext3_msg(sb, KERN_ERR, "error: filesystem has both journal "
2264                        "and inode journals");
2265                 return -EINVAL;
2266         }
2267
2268         if (journal_inum) {
2269                 if (!(journal = ext3_get_journal(sb, journal_inum)))
2270                         return -EINVAL;
2271         } else {
2272                 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
2273                         return -EINVAL;
2274         }
2275
2276         if (!(journal->j_flags & JFS_BARRIER))
2277                 printk(KERN_INFO "EXT3-fs: barriers not enabled\n");
2278
2279         if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2280                 err = journal_update_format(journal);
2281                 if (err)  {
2282                         ext3_msg(sb, KERN_ERR, "error updating journal");
2283                         journal_destroy(journal);
2284                         return err;
2285                 }
2286         }
2287
2288         if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
2289                 err = journal_wipe(journal, !really_read_only);
2290         if (!err)
2291                 err = journal_load(journal);
2292
2293         if (err) {
2294                 ext3_msg(sb, KERN_ERR, "error loading journal");
2295                 journal_destroy(journal);
2296                 return err;
2297         }
2298
2299         EXT3_SB(sb)->s_journal = journal;
2300         ext3_clear_journal_err(sb, es);
2301
2302         if (journal_devnum &&
2303             journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2304                 es->s_journal_dev = cpu_to_le32(journal_devnum);
2305
2306                 /* Make sure we flush the recovery flag to disk. */
2307                 ext3_commit_super(sb, es, 1);
2308         }
2309
2310         return 0;
2311 }
2312
2313 static int ext3_create_journal(struct super_block *sb,
2314                                struct ext3_super_block *es,
2315                                unsigned int journal_inum)
2316 {
2317         journal_t *journal;
2318         int err;
2319
2320         if (sb->s_flags & MS_RDONLY) {
2321                 ext3_msg(sb, KERN_ERR,
2322                         "error: readonly filesystem when trying to "
2323                         "create journal");
2324                 return -EROFS;
2325         }
2326
2327         journal = ext3_get_journal(sb, journal_inum);
2328         if (!journal)
2329                 return -EINVAL;
2330
2331         ext3_msg(sb, KERN_INFO, "creating new journal on inode %u",
2332                journal_inum);
2333
2334         err = journal_create(journal);
2335         if (err) {
2336                 ext3_msg(sb, KERN_ERR, "error creating journal");
2337                 journal_destroy(journal);
2338                 return -EIO;
2339         }
2340
2341         EXT3_SB(sb)->s_journal = journal;
2342
2343         ext3_update_dynamic_rev(sb);
2344         EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2345         EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2346
2347         es->s_journal_inum = cpu_to_le32(journal_inum);
2348
2349         /* Make sure we flush the recovery flag to disk. */
2350         ext3_commit_super(sb, es, 1);
2351
2352         return 0;
2353 }
2354
2355 static int ext3_commit_super(struct super_block *sb,
2356                                struct ext3_super_block *es,
2357                                int sync)
2358 {
2359         struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
2360         int error = 0;
2361
2362         if (!sbh)
2363                 return error;
2364
2365         if (buffer_write_io_error(sbh)) {
2366                 /*
2367                  * Oh, dear.  A previous attempt to write the
2368                  * superblock failed.  This could happen because the
2369                  * USB device was yanked out.  Or it could happen to
2370                  * be a transient write error and maybe the block will
2371                  * be remapped.  Nothing we can do but to retry the
2372                  * write and hope for the best.
2373                  */
2374                 ext3_msg(sb, KERN_ERR, "previous I/O error to "
2375                        "superblock detected");
2376                 clear_buffer_write_io_error(sbh);
2377                 set_buffer_uptodate(sbh);
2378         }
2379         /*
2380          * If the file system is mounted read-only, don't update the
2381          * superblock write time.  This avoids updating the superblock
2382          * write time when we are mounting the root file system
2383          * read/only but we need to replay the journal; at that point,
2384          * for people who are east of GMT and who make their clock
2385          * tick in localtime for Windows bug-for-bug compatibility,
2386          * the clock is set in the future, and this will cause e2fsck
2387          * to complain and force a full file system check.
2388          */
2389         if (!(sb->s_flags & MS_RDONLY))
2390                 es->s_wtime = cpu_to_le32(get_seconds());
2391         es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2392         es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2393         BUFFER_TRACE(sbh, "marking dirty");
2394         mark_buffer_dirty(sbh);
2395         if (sync) {
2396                 error = sync_dirty_buffer(sbh);
2397                 if (buffer_write_io_error(sbh)) {
2398                         ext3_msg(sb, KERN_ERR, "I/O error while writing "
2399                                "superblock");
2400                         clear_buffer_write_io_error(sbh);
2401                         set_buffer_uptodate(sbh);
2402                 }
2403         }
2404         return error;
2405 }
2406
2407
2408 /*
2409  * Have we just finished recovery?  If so, and if we are mounting (or
2410  * remounting) the filesystem readonly, then we will end up with a
2411  * consistent fs on disk.  Record that fact.
2412  */
2413 static void ext3_mark_recovery_complete(struct super_block * sb,
2414                                         struct ext3_super_block * es)
2415 {
2416         journal_t *journal = EXT3_SB(sb)->s_journal;
2417
2418         journal_lock_updates(journal);
2419         if (journal_flush(journal) < 0)
2420                 goto out;
2421
2422         if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2423             sb->s_flags & MS_RDONLY) {
2424                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2425                 ext3_commit_super(sb, es, 1);
2426         }
2427
2428 out:
2429         journal_unlock_updates(journal);
2430 }
2431
2432 /*
2433  * If we are mounting (or read-write remounting) a filesystem whose journal
2434  * has recorded an error from a previous lifetime, move that error to the
2435  * main filesystem now.
2436  */
2437 static void ext3_clear_journal_err(struct super_block *sb,
2438                                    struct ext3_super_block *es)
2439 {
2440         journal_t *journal;
2441         int j_errno;
2442         const char *errstr;
2443
2444         journal = EXT3_SB(sb)->s_journal;
2445
2446         /*
2447          * Now check for any error status which may have been recorded in the
2448          * journal by a prior ext3_error() or ext3_abort()
2449          */
2450
2451         j_errno = journal_errno(journal);
2452         if (j_errno) {
2453                 char nbuf[16];
2454
2455                 errstr = ext3_decode_error(sb, j_errno, nbuf);
2456                 ext3_warning(sb, __func__, "Filesystem error recorded "
2457                              "from previous mount: %s", errstr);
2458                 ext3_warning(sb, __func__, "Marking fs in need of "
2459                              "filesystem check.");
2460
2461                 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2462                 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2463                 ext3_commit_super (sb, es, 1);
2464
2465                 journal_clear_err(journal);
2466         }
2467 }
2468
2469 /*
2470  * Force the running and committing transactions to commit,
2471  * and wait on the commit.
2472  */
2473 int ext3_force_commit(struct super_block *sb)
2474 {
2475         journal_t *journal;
2476         int ret;
2477
2478         if (sb->s_flags & MS_RDONLY)
2479                 return 0;
2480
2481         journal = EXT3_SB(sb)->s_journal;
2482         ret = ext3_journal_force_commit(journal);
2483         return ret;
2484 }
2485
2486 static int ext3_sync_fs(struct super_block *sb, int wait)
2487 {
2488         tid_t target;
2489
2490         if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2491                 if (wait)
2492                         log_wait_commit(EXT3_SB(sb)->s_journal, target);
2493         }
2494         return 0;
2495 }
2496
2497 /*
2498  * LVM calls this function before a (read-only) snapshot is created.  This
2499  * gives us a chance to flush the journal completely and mark the fs clean.
2500  */
2501 static int ext3_freeze(struct super_block *sb)
2502 {
2503         int error = 0;
2504         journal_t *journal;
2505
2506         if (!(sb->s_flags & MS_RDONLY)) {
2507                 journal = EXT3_SB(sb)->s_journal;
2508
2509                 /* Now we set up the journal barrier. */
2510                 journal_lock_updates(journal);
2511
2512                 /*
2513                  * We don't want to clear needs_recovery flag when we failed
2514                  * to flush the journal.
2515                  */
2516                 error = journal_flush(journal);
2517                 if (error < 0)
2518                         goto out;
2519
2520                 /* Journal blocked and flushed, clear needs_recovery flag. */
2521                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2522                 error = ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2523                 if (error)
2524                         goto out;
2525         }
2526         return 0;
2527
2528 out:
2529         journal_unlock_updates(journal);
2530         return error;
2531 }
2532
2533 /*
2534  * Called by LVM after the snapshot is done.  We need to reset the RECOVER
2535  * flag here, even though the filesystem is not technically dirty yet.
2536  */
2537 static int ext3_unfreeze(struct super_block *sb)
2538 {
2539         if (!(sb->s_flags & MS_RDONLY)) {
2540                 lock_super(sb);
2541                 /* Reser the needs_recovery flag before the fs is unlocked. */
2542                 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2543                 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2544                 unlock_super(sb);
2545                 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2546         }
2547         return 0;
2548 }
2549
2550 static int ext3_remount (struct super_block * sb, int * flags, char * data)
2551 {
2552         struct ext3_super_block * es;
2553         struct ext3_sb_info *sbi = EXT3_SB(sb);
2554         ext3_fsblk_t n_blocks_count = 0;
2555         unsigned long old_sb_flags;
2556         struct ext3_mount_options old_opts;
2557         int enable_quota = 0;
2558         int err;
2559 #ifdef CONFIG_QUOTA
2560         int i;
2561 #endif
2562
2563         lock_kernel();
2564
2565         /* Store the original options */
2566         lock_super(sb);
2567         old_sb_flags = sb->s_flags;
2568         old_opts.s_mount_opt = sbi->s_mount_opt;
2569         old_opts.s_resuid = sbi->s_resuid;
2570         old_opts.s_resgid = sbi->s_resgid;
2571         old_opts.s_commit_interval = sbi->s_commit_interval;
2572 #ifdef CONFIG_QUOTA
2573         old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2574         for (i = 0; i < MAXQUOTAS; i++)
2575                 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2576 #endif
2577
2578         /*
2579          * Allow the "check" option to be passed as a remount option.
2580          */
2581         if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2582                 err = -EINVAL;
2583                 goto restore_opts;
2584         }
2585
2586         if (test_opt(sb, ABORT))
2587                 ext3_abort(sb, __func__, "Abort forced by user");
2588
2589         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2590                 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
2591
2592         es = sbi->s_es;
2593
2594         ext3_init_journal_params(sb, sbi->s_journal);
2595
2596         if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2597                 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
2598                 if (test_opt(sb, ABORT)) {
2599                         err = -EROFS;
2600                         goto restore_opts;
2601                 }
2602
2603                 if (*flags & MS_RDONLY) {
2604                         err = dquot_suspend(sb, -1);
2605                         if (err < 0)
2606                                 goto restore_opts;
2607
2608                         /*
2609                          * First of all, the unconditional stuff we have to do
2610                          * to disable replay of the journal when we next remount
2611                          */
2612                         sb->s_flags |= MS_RDONLY;
2613
2614                         /*
2615                          * OK, test if we are remounting a valid rw partition
2616                          * readonly, and if so set the rdonly flag and then
2617                          * mark the partition as valid again.
2618                          */
2619                         if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2620                             (sbi->s_mount_state & EXT3_VALID_FS))
2621                                 es->s_state = cpu_to_le16(sbi->s_mount_state);
2622
2623                         ext3_mark_recovery_complete(sb, es);
2624                 } else {
2625                         __le32 ret;
2626                         if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2627                                         ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2628                                 ext3_msg(sb, KERN_WARNING,
2629                                         "warning: couldn't remount RDWR "
2630                                         "because of unsupported optional "
2631                                         "features (%x)", le32_to_cpu(ret));
2632                                 err = -EROFS;
2633                                 goto restore_opts;
2634                         }
2635
2636                         /*
2637                          * If we have an unprocessed orphan list hanging
2638                          * around from a previously readonly bdev mount,
2639                          * require a full umount/remount for now.
2640                          */
2641                         if (es->s_last_orphan) {
2642                                 ext3_msg(sb, KERN_WARNING, "warning: couldn't "
2643                                        "remount RDWR because of unprocessed "
2644                                        "orphan inode list.  Please "
2645                                        "umount/remount instead.");
2646                                 err = -EINVAL;
2647                                 goto restore_opts;
2648                         }
2649
2650                         /*
2651                          * Mounting a RDONLY partition read-write, so reread
2652                          * and store the current valid flag.  (It may have
2653                          * been changed by e2fsck since we originally mounted
2654                          * the partition.)
2655                          */
2656                         ext3_clear_journal_err(sb, es);
2657                         sbi->s_mount_state = le16_to_cpu(es->s_state);
2658                         if ((err = ext3_group_extend(sb, es, n_blocks_count)))
2659                                 goto restore_opts;
2660                         if (!ext3_setup_super (sb, es, 0))
2661                                 sb->s_flags &= ~MS_RDONLY;
2662                         enable_quota = 1;
2663                 }
2664         }
2665 #ifdef CONFIG_QUOTA
2666         /* Release old quota file names */
2667         for (i = 0; i < MAXQUOTAS; i++)
2668                 if (old_opts.s_qf_names[i] &&
2669                     old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2670                         kfree(old_opts.s_qf_names[i]);
2671 #endif
2672         unlock_super(sb);
2673         unlock_kernel();
2674
2675         if (enable_quota)
2676                 dquot_resume(sb, -1);
2677         return 0;
2678 restore_opts:
2679         sb->s_flags = old_sb_flags;
2680         sbi->s_mount_opt = old_opts.s_mount_opt;
2681         sbi->s_resuid = old_opts.s_resuid;
2682         sbi->s_resgid = old_opts.s_resgid;
2683         sbi->s_commit_interval = old_opts.s_commit_interval;
2684 #ifdef CONFIG_QUOTA
2685         sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2686         for (i = 0; i < MAXQUOTAS; i++) {
2687                 if (sbi->s_qf_names[i] &&
2688                     old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2689                         kfree(sbi->s_qf_names[i]);
2690                 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2691         }
2692 #endif
2693         unlock_super(sb);
2694         unlock_kernel();
2695         return err;
2696 }
2697
2698 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
2699 {
2700         struct super_block *sb = dentry->d_sb;
2701         struct ext3_sb_info *sbi = EXT3_SB(sb);
2702         struct ext3_super_block *es = sbi->s_es;
2703         u64 fsid;
2704
2705         if (test_opt(sb, MINIX_DF)) {
2706                 sbi->s_overhead_last = 0;
2707         } else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
2708                 unsigned long ngroups = sbi->s_groups_count, i;
2709                 ext3_fsblk_t overhead = 0;
2710                 smp_rmb();
2711
2712                 /*
2713                  * Compute the overhead (FS structures).  This is constant
2714                  * for a given filesystem unless the number of block groups
2715                  * changes so we cache the previous value until it does.
2716                  */
2717
2718                 /*
2719                  * All of the blocks before first_data_block are
2720                  * overhead
2721                  */
2722                 overhead = le32_to_cpu(es->s_first_data_block);
2723
2724                 /*
2725                  * Add the overhead attributed to the superblock and
2726                  * block group descriptors.  If the sparse superblocks
2727                  * feature is turned on, then not all groups have this.
2728                  */
2729                 for (i = 0; i < ngroups; i++) {
2730                         overhead += ext3_bg_has_super(sb, i) +
2731                                 ext3_bg_num_gdb(sb, i);
2732                         cond_resched();
2733                 }
2734
2735                 /*
2736                  * Every block group has an inode bitmap, a block
2737                  * bitmap, and an inode table.
2738                  */
2739                 overhead += ngroups * (2 + sbi->s_itb_per_group);
2740                 sbi->s_overhead_last = overhead;
2741                 smp_wmb();
2742                 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
2743         }
2744
2745         buf->f_type = EXT3_SUPER_MAGIC;
2746         buf->f_bsize = sb->s_blocksize;
2747         buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
2748         buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
2749         buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2750         if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2751                 buf->f_bavail = 0;
2752         buf->f_files = le32_to_cpu(es->s_inodes_count);
2753         buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
2754         buf->f_namelen = EXT3_NAME_LEN;
2755         fsid = le64_to_cpup((void *)es->s_uuid) ^
2756                le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2757         buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2758         buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
2759         return 0;
2760 }
2761
2762 /* Helper function for writing quotas on sync - we need to start transaction before quota file
2763  * is locked for write. Otherwise the are possible deadlocks:
2764  * Process 1                         Process 2
2765  * ext3_create()                     quota_sync()
2766  *   journal_start()                   write_dquot()
2767  *   dquot_initialize()                       down(dqio_mutex)
2768  *     down(dqio_mutex)                    journal_start()
2769  *
2770  */
2771
2772 #ifdef CONFIG_QUOTA
2773
2774 static inline struct inode *dquot_to_inode(struct dquot *dquot)
2775 {
2776         return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2777 }
2778
2779 static int ext3_write_dquot(struct dquot *dquot)
2780 {
2781         int ret, err;
2782         handle_t *handle;
2783         struct inode *inode;
2784
2785         inode = dquot_to_inode(dquot);
2786         handle = ext3_journal_start(inode,
2787                                         EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2788         if (IS_ERR(handle))
2789                 return PTR_ERR(handle);
2790         ret = dquot_commit(dquot);
2791         err = ext3_journal_stop(handle);
2792         if (!ret)
2793                 ret = err;
2794         return ret;
2795 }
2796
2797 static int ext3_acquire_dquot(struct dquot *dquot)
2798 {
2799         int ret, err;
2800         handle_t *handle;
2801
2802         handle = ext3_journal_start(dquot_to_inode(dquot),
2803                                         EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2804         if (IS_ERR(handle))
2805                 return PTR_ERR(handle);
2806         ret = dquot_acquire(dquot);
2807         err = ext3_journal_stop(handle);
2808         if (!ret)
2809                 ret = err;
2810         return ret;
2811 }
2812
2813 static int ext3_release_dquot(struct dquot *dquot)
2814 {
2815         int ret, err;
2816         handle_t *handle;
2817
2818         handle = ext3_journal_start(dquot_to_inode(dquot),
2819                                         EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2820         if (IS_ERR(handle)) {
2821                 /* Release dquot anyway to avoid endless cycle in dqput() */
2822                 dquot_release(dquot);
2823                 return PTR_ERR(handle);
2824         }
2825         ret = dquot_release(dquot);
2826         err = ext3_journal_stop(handle);
2827         if (!ret)
2828                 ret = err;
2829         return ret;
2830 }
2831
2832 static int ext3_mark_dquot_dirty(struct dquot *dquot)
2833 {
2834         /* Are we journaling quotas? */
2835         if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2836             EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2837                 dquot_mark_dquot_dirty(dquot);
2838                 return ext3_write_dquot(dquot);
2839         } else {
2840                 return dquot_mark_dquot_dirty(dquot);
2841         }
2842 }
2843
2844 static int ext3_write_info(struct super_block *sb, int type)
2845 {
2846         int ret, err;
2847         handle_t *handle;
2848
2849         /* Data block + inode block */
2850         handle = ext3_journal_start(sb->s_root->d_inode, 2);
2851         if (IS_ERR(handle))
2852                 return PTR_ERR(handle);
2853         ret = dquot_commit_info(sb, type);
2854         err = ext3_journal_stop(handle);
2855         if (!ret)
2856                 ret = err;
2857         return ret;
2858 }
2859
2860 /*
2861  * Turn on quotas during mount time - we need to find
2862  * the quota file and such...
2863  */
2864 static int ext3_quota_on_mount(struct super_block *sb, int type)
2865 {
2866         return dquot_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2867                                         EXT3_SB(sb)->s_jquota_fmt, type);
2868 }
2869
2870 /*
2871  * Standard function to be called on quota_on
2872  */
2873 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
2874                          char *name)
2875 {
2876         int err;
2877         struct path path;
2878
2879         if (!test_opt(sb, QUOTA))
2880                 return -EINVAL;
2881
2882         err = kern_path(name, LOOKUP_FOLLOW, &path);
2883         if (err)
2884                 return err;
2885
2886         /* Quotafile not on the same filesystem? */
2887         if (path.mnt->mnt_sb != sb) {
2888                 path_put(&path);
2889                 return -EXDEV;
2890         }
2891         /* Journaling quota? */
2892         if (EXT3_SB(sb)->s_qf_names[type]) {
2893                 /* Quotafile not of fs root? */
2894                 if (path.dentry->d_parent != sb->s_root)
2895                         ext3_msg(sb, KERN_WARNING,
2896                                 "warning: Quota file not on filesystem root. "
2897                                 "Journaled quota will not work.");
2898         }
2899
2900         /*
2901          * When we journal data on quota file, we have to flush journal to see
2902          * all updates to the file when we bypass pagecache...
2903          */
2904         if (ext3_should_journal_data(path.dentry->d_inode)) {
2905                 /*
2906                  * We don't need to lock updates but journal_flush() could
2907                  * otherwise be livelocked...
2908                  */
2909                 journal_lock_updates(EXT3_SB(sb)->s_journal);
2910                 err = journal_flush(EXT3_SB(sb)->s_journal);
2911                 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2912                 if (err) {
2913                         path_put(&path);
2914                         return err;
2915                 }
2916         }
2917
2918         err = dquot_quota_on_path(sb, type, format_id, &path);
2919         path_put(&path);
2920         return err;
2921 }
2922
2923 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2924  * acquiring the locks... As quota files are never truncated and quota code
2925  * itself serializes the operations (and noone else should touch the files)
2926  * we don't have to be afraid of races */
2927 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2928                                size_t len, loff_t off)
2929 {
2930         struct inode *inode = sb_dqopt(sb)->files[type];
2931         sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2932         int err = 0;
2933         int offset = off & (sb->s_blocksize - 1);
2934         int tocopy;
2935         size_t toread;
2936         struct buffer_head *bh;
2937         loff_t i_size = i_size_read(inode);
2938
2939         if (off > i_size)
2940                 return 0;
2941         if (off+len > i_size)
2942                 len = i_size-off;
2943         toread = len;
2944         while (toread > 0) {
2945                 tocopy = sb->s_blocksize - offset < toread ?
2946                                 sb->s_blocksize - offset : toread;
2947                 bh = ext3_bread(NULL, inode, blk, 0, &err);
2948                 if (err)
2949                         return err;
2950                 if (!bh)        /* A hole? */
2951                         memset(data, 0, tocopy);
2952                 else
2953                         memcpy(data, bh->b_data+offset, tocopy);
2954                 brelse(bh);
2955                 offset = 0;
2956                 toread -= tocopy;
2957                 data += tocopy;
2958                 blk++;
2959         }
2960         return len;
2961 }
2962
2963 /* Write to quotafile (we know the transaction is already started and has
2964  * enough credits) */
2965 static ssize_t ext3_quota_write(struct super_block *sb, int type,
2966                                 const char *data, size_t len, loff_t off)
2967 {
2968         struct inode *inode = sb_dqopt(sb)->files[type];
2969         sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2970         int err = 0;
2971         int offset = off & (sb->s_blocksize - 1);
2972         int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
2973         struct buffer_head *bh;
2974         handle_t *handle = journal_current_handle();
2975
2976         if (!handle) {
2977                 ext3_msg(sb, KERN_WARNING,
2978                         "warning: quota write (off=%llu, len=%llu)"
2979                         " cancelled because transaction is not started.",
2980                         (unsigned long long)off, (unsigned long long)len);
2981                 return -EIO;
2982         }
2983
2984         /*
2985          * Since we account only one data block in transaction credits,
2986          * then it is impossible to cross a block boundary.
2987          */
2988         if (sb->s_blocksize - offset < len) {
2989                 ext3_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
2990                         " cancelled because not block aligned",
2991                         (unsigned long long)off, (unsigned long long)len);
2992                 return -EIO;
2993         }
2994         mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2995         bh = ext3_bread(handle, inode, blk, 1, &err);
2996         if (!bh)
2997                 goto out;
2998         if (journal_quota) {
2999                 err = ext3_journal_get_write_access(handle, bh);
3000                 if (err) {
3001                         brelse(bh);
3002                         goto out;
3003                 }
3004         }
3005         lock_buffer(bh);
3006         memcpy(bh->b_data+offset, data, len);
3007         flush_dcache_page(bh->b_page);
3008         unlock_buffer(bh);
3009         if (journal_quota)
3010                 err = ext3_journal_dirty_metadata(handle, bh);
3011         else {
3012                 /* Always do at least ordered writes for quotas */
3013                 err = ext3_journal_dirty_data(handle, bh);
3014                 mark_buffer_dirty(bh);
3015         }
3016         brelse(bh);
3017 out:
3018         if (err) {
3019                 mutex_unlock(&inode->i_mutex);
3020                 return err;
3021         }
3022         if (inode->i_size < off + len) {
3023                 i_size_write(inode, off + len);
3024                 EXT3_I(inode)->i_disksize = inode->i_size;
3025         }
3026         inode->i_version++;
3027         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
3028         ext3_mark_inode_dirty(handle, inode);
3029         mutex_unlock(&inode->i_mutex);
3030         return len;
3031 }
3032
3033 #endif
3034
3035 static int ext3_get_sb(struct file_system_type *fs_type,
3036         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
3037 {
3038         return get_sb_bdev(fs_type, flags, dev_name, data, ext3_fill_super, mnt);
3039 }
3040
3041 static struct file_system_type ext3_fs_type = {
3042         .owner          = THIS_MODULE,
3043         .name           = "ext3",
3044         .get_sb         = ext3_get_sb,
3045         .kill_sb        = kill_block_super,
3046         .fs_flags       = FS_REQUIRES_DEV,
3047 };
3048
3049 static int __init init_ext3_fs(void)
3050 {
3051         int err = init_ext3_xattr();
3052         if (err)
3053                 return err;
3054         err = init_inodecache();
3055         if (err)
3056                 goto out1;
3057         err = register_filesystem(&ext3_fs_type);
3058         if (err)
3059                 goto out;
3060         return 0;
3061 out:
3062         destroy_inodecache();
3063 out1:
3064         exit_ext3_xattr();
3065         return err;
3066 }
3067
3068 static void __exit exit_ext3_fs(void)
3069 {
3070         unregister_filesystem(&ext3_fs_type);
3071         destroy_inodecache();
3072         exit_ext3_xattr();
3073 }
3074
3075 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
3076 MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
3077 MODULE_LICENSE("GPL");
3078 module_init(init_ext3_fs)
3079 module_exit(exit_ext3_fs)