fs/ext3/super.c

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