fs/ext3/super.c

   1 /*
   2  *  linux/fs/ext3/super.c
   3  *
   4  * Copyright (C) 1992, 1993, 1994, 1995
   5  * Remy Card (card@masi.ibp.fr)
   6  * Laboratoire MASI - Institut Blaise Pascal
   7  * Universite Pierre et Marie Curie (Paris VI)
   8  *
   9  *  from
  10  *
  11  *  linux/fs/minix/inode.c
  12  *
  13  *  Copyright (C) 1991, 1992  Linus Torvalds
  14  *
  15  *  Big-endian to little-endian byte-swapping/bitmaps by
  16  *        David S. Miller (davem@caip.rutgers.edu), 1995
  17  */
  18
  19 #include <linux/module.h>
  20 #include <linux/string.h>
  21 #include <linux/fs.h>
  22 #include <linux/time.h>
  23 #include <linux/jbd.h>
  24 #include <linux/ext3_fs.h>
  25 #include <linux/ext3_jbd.h>
  26 #include <linux/slab.h>
  27 #include <linux/init.h>
  28 #include <linux/blkdev.h>
  29 #include <linux/parser.h>
  30 #include <linux/smp_lock.h>
  31 #include <linux/buffer_head.h>
  32 #include <linux/exportfs.h>
  33 #include <linux/vfs.h>
  34 #include <linux/random.h>
  35 #include <linux/mount.h>
  36 #include <linux/namei.h>
  37 #include <linux/quotaops.h>
  38 #include <linux/seq_file.h>
  39 #include <linux/log2.h>
  40
  41 #include <asm/uaccess.h>
  42
  43 #include "xattr.h"
  44 #include "acl.h"
  45 #include "namei.h"
  46
  47 #ifdef CONFIG_EXT3_DEFAULTS_TO_ORDERED
  48   #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_ORDERED_DATA
  49 #else
  50   #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_WRITEBACK_DATA
  51 #endif
  52
  53 static int ext3_load_journal(struct super_block *, struct ext3_super_block *,
  54                              unsigned long journal_devnum);
  55 static int ext3_create_journal(struct super_block *, struct ext3_super_block *,
  56                                unsigned int);
  57 static int ext3_commit_super(struct super_block *sb,
  58                                struct ext3_super_block *es,
  59                                int sync);
  60 static void ext3_mark_recovery_complete(struct super_block * sb,
  61                                         struct ext3_super_block * es);
  62 static void ext3_clear_journal_err(struct super_block * sb,
  63                                    struct ext3_super_block * es);
  64 static int ext3_sync_fs(struct super_block *sb, int wait);
  65 static const char *ext3_decode_error(struct super_block * sb, int errno,
  66                                      char nbuf[16]);
  67 static int ext3_remount (struct super_block * sb, int * flags, char * data);
  68 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf);
  69 static int ext3_unfreeze(struct super_block *sb);
  70 static void ext3_write_super (struct super_block * sb);
  71 static int ext3_freeze(struct super_block *sb);
  72
  73 /*
  74  * Wrappers for journal_start/end.
  75  *
  76  * The only special thing we need to do here is to make sure that all
  77  * journal_end calls result in the superblock being marked dirty, so
  78  * that sync() will call the filesystem's write_super callback if
  79  * appropriate.
  80  */
  81 handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks)
  82 {
  83         journal_t *journal;
  84
  85         if (sb->s_flags & MS_RDONLY)
  86                 return ERR_PTR(-EROFS);
  87
  88         /* Special case here: if the journal has aborted behind our
  89          * backs (eg. EIO in the commit thread), then we still need to
  90          * take the FS itself readonly cleanly. */
  91         journal = EXT3_SB(sb)->s_journal;
  92         if (is_journal_aborted(journal)) {
  93                 ext3_abort(sb, __func__,
  94                            "Detected aborted journal");
  95                 return ERR_PTR(-EROFS);
  96         }
  97
  98         return journal_start(journal, nblocks);
  99 }
 100
 101 /*
 102  * The only special thing we need to do here is to make sure that all
 103  * journal_stop calls result in the superblock being marked dirty, so
 104  * that sync() will call the filesystem's write_super callback if
 105  * appropriate.
 106  */
 107 int __ext3_journal_stop(const char *where, handle_t *handle)
 108 {
 109         struct super_block *sb;
 110         int err;
 111         int rc;
 112
 113         sb = handle->h_transaction->t_journal->j_private;
 114         err = handle->h_err;
 115         rc = journal_stop(handle);
 116
 117         if (!err)
 118                 err = rc;
 119         if (err)
 120                 __ext3_std_error(sb, where, err);
 121         return err;
 122 }
 123
 124 void ext3_journal_abort_handle(const char *caller, const char *err_fn,
 125                 struct buffer_head *bh, handle_t *handle, int err)
 126 {
 127         char nbuf[16];
 128         const char *errstr = ext3_decode_error(NULL, err, nbuf);
 129
 130         if (bh)
 131                 BUFFER_TRACE(bh, "abort");
 132
 133         if (!handle->h_err)
 134                 handle->h_err = err;
 135
 136         if (is_handle_aborted(handle))
 137                 return;
 138
 139         printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
 140                caller, errstr, err_fn);
 141
 142         journal_abort_handle(handle);
 143 }
 144
 145 /* Deal with the reporting of failure conditions on a filesystem such as
 146  * inconsistencies detected or read IO failures.
 147  *
 148  * On ext2, we can store the error state of the filesystem in the
 149  * superblock.  That is not possible on ext3, because we may have other
 150  * write ordering constraints on the superblock which prevent us from
 151  * writing it out straight away; and given that the journal is about to
 152  * be aborted, we can't rely on the current, or future, transactions to
 153  * write out the superblock safely.
 154  *
 155  * We'll just use the journal_abort() error code to record an error in
 156  * the journal instead.  On recovery, the journal will compain about
 157  * that error until we've noted it down and cleared it.
 158  */
 159
 160 static void ext3_handle_error(struct super_block *sb)
 161 {
 162         struct ext3_super_block *es = EXT3_SB(sb)->s_es;
 163
 164         EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
 165         es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
 166
 167         if (sb->s_flags & MS_RDONLY)
 168                 return;
 169
 170         if (!test_opt (sb, ERRORS_CONT)) {
 171                 journal_t *journal = EXT3_SB(sb)->s_journal;
 172
 173                 EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
 174                 if (journal)
 175                         journal_abort(journal, -EIO);
 176         }
 177         if (test_opt (sb, ERRORS_RO)) {
 178                 printk (KERN_CRIT "Remounting filesystem read-only\n");
 179                 sb->s_flags |= MS_RDONLY;
 180         }
 181         ext3_commit_super(sb, es, 1);
 182         if (test_opt(sb, ERRORS_PANIC))
 183                 panic("EXT3-fs (device %s): panic forced after error\n",
 184                         sb->s_id);
 185 }
 186
 187 void ext3_error (struct super_block * sb, const char * function,
 188                  const char * fmt, ...)
 189 {
 190         va_list args;
 191
 192         va_start(args, fmt);
 193         printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
 194         vprintk(fmt, args);
 195         printk("\n");
 196         va_end(args);
 197
 198         ext3_handle_error(sb);
 199 }
 200
 201 static const char *ext3_decode_error(struct super_block * sb, int errno,
 202                                      char nbuf[16])
 203 {
 204         char *errstr = NULL;
 205
 206         switch (errno) {
 207         case -EIO:
 208                 errstr = "IO failure";
 209                 break;
 210         case -ENOMEM:
 211                 errstr = "Out of memory";
 212                 break;
 213         case -EROFS:
 214                 if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT)
 215                         errstr = "Journal has aborted";
 216                 else
 217                         errstr = "Readonly filesystem";
 218                 break;
 219         default:
 220                 /* If the caller passed in an extra buffer for unknown
 221                  * errors, textualise them now.  Else we just return
 222                  * NULL. */
 223                 if (nbuf) {
 224                         /* Check for truncated error codes... */
 225                         if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
 226                                 errstr = nbuf;
 227                 }
 228                 break;
 229         }
 230
 231         return errstr;
 232 }
 233
 234 /* __ext3_std_error decodes expected errors from journaling functions
 235  * automatically and invokes the appropriate error response.  */
 236
 237 void __ext3_std_error (struct super_block * sb, const char * function,
 238                        int errno)
 239 {
 240         char nbuf[16];
 241         const char *errstr;
 242
 243         /* Special case: if the error is EROFS, and we're not already
 244          * inside a transaction, then there's really no point in logging
 245          * an error. */
 246         if (errno == -EROFS && journal_current_handle() == NULL &&
 247             (sb->s_flags & MS_RDONLY))
 248                 return;
 249
 250         errstr = ext3_decode_error(sb, errno, nbuf);
 251         printk (KERN_CRIT "EXT3-fs error (device %s) in %s: %s\n",
 252                 sb->s_id, function, errstr);
 253
 254         ext3_handle_error(sb);
 255 }
 256
 257 /*
 258  * ext3_abort is a much stronger failure handler than ext3_error.  The
 259  * abort function may be used to deal with unrecoverable failures such
 260  * as journal IO errors or ENOMEM at a critical moment in log management.
 261  *
 262  * We unconditionally force the filesystem into an ABORT|READONLY state,
 263  * unless the error response on the fs has been set to panic in which
 264  * case we take the easy way out and panic immediately.
 265  */
 266
 267 void ext3_abort (struct super_block * sb, const char * function,
 268                  const char * fmt, ...)
 269 {
 270         va_list args;
 271
 272         printk (KERN_CRIT "ext3_abort called.\n");
 273
 274         va_start(args, fmt);
 275         printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
 276         vprintk(fmt, args);
 277         printk("\n");
 278         va_end(args);
 279
 280         if (test_opt(sb, ERRORS_PANIC))
 281                 panic("EXT3-fs panic from previous error\n");
 282
 283         if (sb->s_flags & MS_RDONLY)
 284                 return;
 285
 286         printk(KERN_CRIT "Remounting filesystem read-only\n");
 287         EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
 288         sb->s_flags |= MS_RDONLY;
 289         EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
 290         if (EXT3_SB(sb)->s_journal)
 291                 journal_abort(EXT3_SB(sb)->s_journal, -EIO);
 292 }
 293
 294 void ext3_warning (struct super_block * sb, const char * function,
 295                    const char * fmt, ...)
 296 {
 297         va_list args;
 298
 299         va_start(args, fmt);
 300         printk(KERN_WARNING "EXT3-fs warning (device %s): %s: ",
 301                sb->s_id, function);
 302         vprintk(fmt, args);
 303         printk("\n");
 304         va_end(args);
 305 }
 306
 307 void ext3_update_dynamic_rev(struct super_block *sb)
 308 {
 309         struct ext3_super_block *es = EXT3_SB(sb)->s_es;
 310
 311         if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
 312                 return;
 313
 314         ext3_warning(sb, __func__,
 315                      "updating to rev %d because of new feature flag, "
 316                      "running e2fsck is recommended",
 317                      EXT3_DYNAMIC_REV);
 318
 319         es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO);
 320         es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE);
 321         es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV);
 322         /* leave es->s_feature_*compat flags alone */
 323         /* es->s_uuid will be set by e2fsck if empty */
 324
 325         /*
 326          * The rest of the superblock fields should be zero, and if not it
 327          * means they are likely already in use, so leave them alone.  We
 328          * can leave it up to e2fsck to clean up any inconsistencies there.
 329          */
 330 }
 331
 332 /*
 333  * Open the external journal device
 334  */
 335 static struct block_device *ext3_blkdev_get(dev_t dev)
 336 {
 337         struct block_device *bdev;
 338         char b[BDEVNAME_SIZE];
 339
 340         bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
 341         if (IS_ERR(bdev))
 342                 goto fail;
 343         return bdev;
 344
 345 fail:
 346         printk(KERN_ERR "EXT3: failed to open journal device %s: %ld\n",
 347                         __bdevname(dev, b), PTR_ERR(bdev));
 348         return NULL;
 349 }
 350
 351 /*
 352  * Release the journal device
 353  */
 354 static int ext3_blkdev_put(struct block_device *bdev)
 355 {
 356         bd_release(bdev);
 357         return blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
 358 }
 359
 360 static int ext3_blkdev_remove(struct ext3_sb_info *sbi)
 361 {
 362         struct block_device *bdev;
 363         int ret = -ENODEV;
 364
 365         bdev = sbi->journal_bdev;
 366         if (bdev) {
 367                 ret = ext3_blkdev_put(bdev);
 368                 sbi->journal_bdev = NULL;
 369         }
 370         return ret;
 371 }
 372
 373 static inline struct inode *orphan_list_entry(struct list_head *l)
 374 {
 375         return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
 376 }
 377
 378 static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
 379 {
 380         struct list_head *l;
 381
 382         printk(KERN_ERR "sb orphan head is %d\n",
 383                le32_to_cpu(sbi->s_es->s_last_orphan));
 384
 385         printk(KERN_ERR "sb_info orphan list:\n");
 386         list_for_each(l, &sbi->s_orphan) {
 387                 struct inode *inode = orphan_list_entry(l);
 388                 printk(KERN_ERR "  "
 389                        "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
 390                        inode->i_sb->s_id, inode->i_ino, inode,
 391                        inode->i_mode, inode->i_nlink,
 392                        NEXT_ORPHAN(inode));
 393         }
 394 }
 395
 396 static void ext3_put_super (struct super_block * sb)
 397 {
 398         struct ext3_sb_info *sbi = EXT3_SB(sb);
 399         struct ext3_super_block *es = sbi->s_es;
 400         int i, err;
 401
 402         ext3_xattr_put_super(sb);
 403         err = journal_destroy(sbi->s_journal);
 404         sbi->s_journal = NULL;
 405         if (err < 0)
 406                 ext3_abort(sb, __func__, "Couldn't clean up the journal");
 407
 408         if (!(sb->s_flags & MS_RDONLY)) {
 409                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
 410                 es->s_state = cpu_to_le16(sbi->s_mount_state);
 411                 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
 412                 mark_buffer_dirty(sbi->s_sbh);
 413                 ext3_commit_super(sb, es, 1);
 414         }
 415
 416         for (i = 0; i < sbi->s_gdb_count; i++)
 417                 brelse(sbi->s_group_desc[i]);
 418         kfree(sbi->s_group_desc);
 419         percpu_counter_destroy(&sbi->s_freeblocks_counter);
 420         percpu_counter_destroy(&sbi->s_freeinodes_counter);
 421         percpu_counter_destroy(&sbi->s_dirs_counter);
 422         brelse(sbi->s_sbh);
 423 #ifdef CONFIG_QUOTA
 424         for (i = 0; i < MAXQUOTAS; i++)
 425                 kfree(sbi->s_qf_names[i]);
 426 #endif
 427
 428         /* Debugging code just in case the in-memory inode orphan list
 429          * isn't empty.  The on-disk one can be non-empty if we've
 430          * detected an error and taken the fs readonly, but the
 431          * in-memory list had better be clean by this point. */
 432         if (!list_empty(&sbi->s_orphan))
 433                 dump_orphan_list(sb, sbi);
 434         J_ASSERT(list_empty(&sbi->s_orphan));
 435
 436         invalidate_bdev(sb->s_bdev);
 437         if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
 438                 /*
 439                  * Invalidate the journal device's buffers.  We don't want them
 440                  * floating about in memory - the physical journal device may
 441                  * hotswapped, and it breaks the `ro-after' testing code.
 442                  */
 443                 sync_blockdev(sbi->journal_bdev);
 444                 invalidate_bdev(sbi->journal_bdev);
 445                 ext3_blkdev_remove(sbi);
 446         }
 447         sb->s_fs_info = NULL;
 448         kfree(sbi->s_blockgroup_lock);
 449         kfree(sbi);
 450         return;
 451 }
 452
 453 static struct kmem_cache *ext3_inode_cachep;
 454
 455 /*
 456  * Called inside transaction, so use GFP_NOFS
 457  */
 458 static struct inode *ext3_alloc_inode(struct super_block *sb)
 459 {
 460         struct ext3_inode_info *ei;
 461
 462         ei = kmem_cache_alloc(ext3_inode_cachep, GFP_NOFS);
 463         if (!ei)
 464                 return NULL;
 465 #ifdef CONFIG_EXT3_FS_POSIX_ACL
 466         ei->i_acl = EXT3_ACL_NOT_CACHED;
 467         ei->i_default_acl = EXT3_ACL_NOT_CACHED;
 468 #endif
 469         ei->i_block_alloc_info = NULL;
 470         ei->vfs_inode.i_version = 1;
 471         return &ei->vfs_inode;
 472 }
 473
 474 static void ext3_destroy_inode(struct inode *inode)
 475 {
 476         if (!list_empty(&(EXT3_I(inode)->i_orphan))) {
 477                 printk("EXT3 Inode %p: orphan list check failed!\n",
 478                         EXT3_I(inode));
 479                 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
 480                                 EXT3_I(inode), sizeof(struct ext3_inode_info),
 481                                 false);
 482                 dump_stack();
 483         }
 484         kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
 485 }
 486
 487 static void init_once(void *foo)
 488 {
 489         struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
 490
 491         INIT_LIST_HEAD(&ei->i_orphan);
 492 #ifdef CONFIG_EXT3_FS_XATTR
 493         init_rwsem(&ei->xattr_sem);
 494 #endif
 495         mutex_init(&ei->truncate_mutex);
 496         inode_init_once(&ei->vfs_inode);
 497 }
 498
 499 static int init_inodecache(void)
 500 {
 501         ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
 502                                              sizeof(struct ext3_inode_info),
 503                                              0, (SLAB_RECLAIM_ACCOUNT|
 504                                                 SLAB_MEM_SPREAD),
 505                                              init_once);
 506         if (ext3_inode_cachep == NULL)
 507                 return -ENOMEM;
 508         return 0;
 509 }
 510
 511 static void destroy_inodecache(void)
 512 {
 513         kmem_cache_destroy(ext3_inode_cachep);
 514 }
 515
 516 static void ext3_clear_inode(struct inode *inode)
 517 {
 518         struct ext3_block_alloc_info *rsv = EXT3_I(inode)->i_block_alloc_info;
 519 #ifdef CONFIG_EXT3_FS_POSIX_ACL
 520         if (EXT3_I(inode)->i_acl &&
 521                         EXT3_I(inode)->i_acl != EXT3_ACL_NOT_CACHED) {
 522                 posix_acl_release(EXT3_I(inode)->i_acl);
 523                 EXT3_I(inode)->i_acl = EXT3_ACL_NOT_CACHED;
 524         }
 525         if (EXT3_I(inode)->i_default_acl &&
 526                         EXT3_I(inode)->i_default_acl != EXT3_ACL_NOT_CACHED) {
 527                 posix_acl_release(EXT3_I(inode)->i_default_acl);
 528                 EXT3_I(inode)->i_default_acl = EXT3_ACL_NOT_CACHED;
 529         }
 530 #endif
 531         ext3_discard_reservation(inode);
 532         EXT3_I(inode)->i_block_alloc_info = NULL;
 533         if (unlikely(rsv))
 534                 kfree(rsv);
 535 }
 536
 537 static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
 538 {
 539 #if defined(CONFIG_QUOTA)
 540         struct ext3_sb_info *sbi = EXT3_SB(sb);
 541
 542         if (sbi->s_jquota_fmt)
 543                 seq_printf(seq, ",jqfmt=%s",
 544                 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0");
 545
 546         if (sbi->s_qf_names[USRQUOTA])
 547                 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
 548
 549         if (sbi->s_qf_names[GRPQUOTA])
 550                 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
 551
 552         if (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA)
 553                 seq_puts(seq, ",usrquota");
 554
 555         if (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)
 556                 seq_puts(seq, ",grpquota");
 557 #endif
 558 }
 559
 560 /*
 561  * Show an option if
 562  *  - it's set to a non-default value OR
 563  *  - if the per-sb default is different from the global default
 564  */
 565 static int ext3_show_options(struct seq_file *seq, struct vfsmount *vfs)
 566 {
 567         struct super_block *sb = vfs->mnt_sb;
 568         struct ext3_sb_info *sbi = EXT3_SB(sb);
 569         struct ext3_super_block *es = sbi->s_es;
 570         unsigned long def_mount_opts;
 571
 572         def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
 573
 574         if (sbi->s_sb_block != 1)
 575                 seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
 576         if (test_opt(sb, MINIX_DF))
 577                 seq_puts(seq, ",minixdf");
 578         if (test_opt(sb, GRPID))
 579                 seq_puts(seq, ",grpid");
 580         if (!test_opt(sb, GRPID) && (def_mount_opts & EXT3_DEFM_BSDGROUPS))
 581                 seq_puts(seq, ",nogrpid");
 582         if (sbi->s_resuid != EXT3_DEF_RESUID ||
 583             le16_to_cpu(es->s_def_resuid) != EXT3_DEF_RESUID) {
 584                 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
 585         }
 586         if (sbi->s_resgid != EXT3_DEF_RESGID ||
 587             le16_to_cpu(es->s_def_resgid) != EXT3_DEF_RESGID) {
 588                 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
 589         }
 590         if (test_opt(sb, ERRORS_RO)) {
 591                 int def_errors = le16_to_cpu(es->s_errors);
 592
 593                 if (def_errors == EXT3_ERRORS_PANIC ||
 594                     def_errors == EXT3_ERRORS_CONTINUE) {
 595                         seq_puts(seq, ",errors=remount-ro");
 596                 }
 597         }
 598         if (test_opt(sb, ERRORS_CONT))
 599                 seq_puts(seq, ",errors=continue");
 600         if (test_opt(sb, ERRORS_PANIC))
 601                 seq_puts(seq, ",errors=panic");
 602         if (test_opt(sb, NO_UID32))
 603                 seq_puts(seq, ",nouid32");
 604         if (test_opt(sb, DEBUG))
 605                 seq_puts(seq, ",debug");
 606         if (test_opt(sb, OLDALLOC))
 607                 seq_puts(seq, ",oldalloc");
 608 #ifdef CONFIG_EXT3_FS_XATTR
 609         if (test_opt(sb, XATTR_USER))
 610                 seq_puts(seq, ",user_xattr");
 611         if (!test_opt(sb, XATTR_USER) &&
 612             (def_mount_opts & EXT3_DEFM_XATTR_USER)) {
 613                 seq_puts(seq, ",nouser_xattr");
 614         }
 615 #endif
 616 #ifdef CONFIG_EXT3_FS_POSIX_ACL
 617         if (test_opt(sb, POSIX_ACL))
 618                 seq_puts(seq, ",acl");
 619         if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT3_DEFM_ACL))
 620                 seq_puts(seq, ",noacl");
 621 #endif
 622         if (!test_opt(sb, RESERVATION))
 623                 seq_puts(seq, ",noreservation");
 624         if (sbi->s_commit_interval) {
 625                 seq_printf(seq, ",commit=%u",
 626                            (unsigned) (sbi->s_commit_interval / HZ));
 627         }
 628         if (test_opt(sb, BARRIER))
 629                 seq_puts(seq, ",barrier=1");
 630         if (test_opt(sb, NOBH))
 631                 seq_puts(seq, ",nobh");
 632
 633         if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA)
 634                 seq_puts(seq, ",data=journal");
 635         else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA)
 636                 seq_puts(seq, ",data=ordered");
 637         else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)
 638                 seq_puts(seq, ",data=writeback");
 639
 640         if (test_opt(sb, DATA_ERR_ABORT))
 641                 seq_puts(seq, ",data_err=abort");
 642
 643         ext3_show_quota_options(seq, sb);
 644
 645         return 0;
 646 }
 647
 648
 649 static struct inode *ext3_nfs_get_inode(struct super_block *sb,
 650                 u64 ino, u32 generation)
 651 {
 652         struct inode *inode;
 653
 654         if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO)
 655                 return ERR_PTR(-ESTALE);
 656         if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count))
 657                 return ERR_PTR(-ESTALE);
 658
 659         /* iget isn't really right if the inode is currently unallocated!!
 660          *
 661          * ext3_read_inode will return a bad_inode if the inode had been
 662          * deleted, so we should be safe.
 663          *
 664          * Currently we don't know the generation for parent directory, so
 665          * a generation of 0 means "accept any"
 666          */
 667         inode = ext3_iget(sb, ino);
 668         if (IS_ERR(inode))
 669                 return ERR_CAST(inode);
 670         if (generation && inode->i_generation != generation) {
 671                 iput(inode);
 672                 return ERR_PTR(-ESTALE);
 673         }
 674
 675         return inode;
 676 }
 677
 678 static struct dentry *ext3_fh_to_dentry(struct super_block *sb, struct fid *fid,
 679                 int fh_len, int fh_type)
 680 {
 681         return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
 682                                     ext3_nfs_get_inode);
 683 }
 684
 685 static struct dentry *ext3_fh_to_parent(struct super_block *sb, struct fid *fid,
 686                 int fh_len, int fh_type)
 687 {
 688         return generic_fh_to_parent(sb, fid, fh_len, fh_type,
 689                                     ext3_nfs_get_inode);
 690 }
 691
 692 /*
 693  * Try to release metadata pages (indirect blocks, directories) which are
 694  * mapped via the block device.  Since these pages could have journal heads
 695  * which would prevent try_to_free_buffers() from freeing them, we must use
 696  * jbd layer's try_to_free_buffers() function to release them.
 697  */
 698 static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
 699                                  gfp_t wait)
 700 {
 701         journal_t *journal = EXT3_SB(sb)->s_journal;
 702
 703         WARN_ON(PageChecked(page));
 704         if (!page_has_buffers(page))
 705                 return 0;
 706         if (journal)
 707                 return journal_try_to_free_buffers(journal, page,
 708                                                    wait & ~__GFP_WAIT);
 709         return try_to_free_buffers(page);
 710 }
 711
 712 #ifdef CONFIG_QUOTA
 713 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
 714 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
 715
 716 static int ext3_write_dquot(struct dquot *dquot);
 717 static int ext3_acquire_dquot(struct dquot *dquot);
 718 static int ext3_release_dquot(struct dquot *dquot);
 719 static int ext3_mark_dquot_dirty(struct dquot *dquot);
 720 static int ext3_write_info(struct super_block *sb, int type);
 721 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
 722                                 char *path, int remount);
 723 static int ext3_quota_on_mount(struct super_block *sb, int type);
 724 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
 725                                size_t len, loff_t off);
 726 static ssize_t ext3_quota_write(struct super_block *sb, int type,
 727                                 const char *data, size_t len, loff_t off);
 728
 729 static struct dquot_operations ext3_quota_operations = {
 730         .initialize     = dquot_initialize,
 731         .drop           = dquot_drop,
 732         .alloc_space    = dquot_alloc_space,
 733         .alloc_inode    = dquot_alloc_inode,
 734         .free_space     = dquot_free_space,
 735         .free_inode     = dquot_free_inode,
 736         .transfer       = dquot_transfer,
 737         .write_dquot    = ext3_write_dquot,
 738         .acquire_dquot  = ext3_acquire_dquot,
 739         .release_dquot  = ext3_release_dquot,
 740         .mark_dirty     = ext3_mark_dquot_dirty,
 741         .write_info     = ext3_write_info,
 742         .alloc_dquot    = dquot_alloc,
 743         .destroy_dquot  = dquot_destroy,
 744 };
 745
 746 static struct quotactl_ops ext3_qctl_operations = {
 747         .quota_on       = ext3_quota_on,
 748         .quota_off      = vfs_quota_off,
 749         .quota_sync     = vfs_quota_sync,
 750         .get_info       = vfs_get_dqinfo,
 751         .set_info       = vfs_set_dqinfo,
 752         .get_dqblk      = vfs_get_dqblk,
 753         .set_dqblk      = vfs_set_dqblk
 754 };
 755 #endif
 756
 757 static const struct super_operations ext3_sops = {
 758         .alloc_inode    = ext3_alloc_inode,
 759         .destroy_inode  = ext3_destroy_inode,
 760         .write_inode    = ext3_write_inode,
 761         .dirty_inode    = ext3_dirty_inode,
 762         .delete_inode   = ext3_delete_inode,
 763         .put_super      = ext3_put_super,
 764         .write_super    = ext3_write_super,
 765         .sync_fs        = ext3_sync_fs,
 766         .freeze_fs      = ext3_freeze,
 767         .unfreeze_fs    = ext3_unfreeze,
 768         .statfs         = ext3_statfs,
 769         .remount_fs     = ext3_remount,
 770         .clear_inode    = ext3_clear_inode,
 771         .show_options   = ext3_show_options,
 772 #ifdef CONFIG_QUOTA
 773         .quota_read     = ext3_quota_read,
 774         .quota_write    = ext3_quota_write,
 775 #endif
 776         .bdev_try_to_free_page = bdev_try_to_free_page,
 777 };
 778
 779 static const struct export_operations ext3_export_ops = {
 780         .fh_to_dentry = ext3_fh_to_dentry,
 781         .fh_to_parent = ext3_fh_to_parent,
 782         .get_parent = ext3_get_parent,
 783 };
 784
 785 enum {
 786         Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
 787         Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
 788         Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
 789         Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
 790         Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
 791         Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
 792         Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
 793         Opt_data_err_abort, Opt_data_err_ignore,
 794         Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
 795         Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
 796         Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
 797         Opt_grpquota
 798 };
 799
 800 static const match_table_t tokens = {
 801         {Opt_bsd_df, "bsddf"},
 802         {Opt_minix_df, "minixdf"},
 803         {Opt_grpid, "grpid"},
 804         {Opt_grpid, "bsdgroups"},
 805         {Opt_nogrpid, "nogrpid"},
 806         {Opt_nogrpid, "sysvgroups"},
 807         {Opt_resgid, "resgid=%u"},
 808         {Opt_resuid, "resuid=%u"},
 809         {Opt_sb, "sb=%u"},
 810         {Opt_err_cont, "errors=continue"},
 811         {Opt_err_panic, "errors=panic"},
 812         {Opt_err_ro, "errors=remount-ro"},
 813         {Opt_nouid32, "nouid32"},
 814         {Opt_nocheck, "nocheck"},
 815         {Opt_nocheck, "check=none"},
 816         {Opt_debug, "debug"},
 817         {Opt_oldalloc, "oldalloc"},
 818         {Opt_orlov, "orlov"},
 819         {Opt_user_xattr, "user_xattr"},
 820         {Opt_nouser_xattr, "nouser_xattr"},
 821         {Opt_acl, "acl"},
 822         {Opt_noacl, "noacl"},
 823         {Opt_reservation, "reservation"},
 824         {Opt_noreservation, "noreservation"},
 825         {Opt_noload, "noload"},
 826         {Opt_nobh, "nobh"},
 827         {Opt_bh, "bh"},
 828         {Opt_commit, "commit=%u"},
 829         {Opt_journal_update, "journal=update"},
 830         {Opt_journal_inum, "journal=%u"},
 831         {Opt_journal_dev, "journal_dev=%u"},
 832         {Opt_abort, "abort"},
 833         {Opt_data_journal, "data=journal"},
 834         {Opt_data_ordered, "data=ordered"},
 835         {Opt_data_writeback, "data=writeback"},
 836         {Opt_data_err_abort, "data_err=abort"},
 837         {Opt_data_err_ignore, "data_err=ignore"},
 838         {Opt_offusrjquota, "usrjquota="},
 839         {Opt_usrjquota, "usrjquota=%s"},
 840         {Opt_offgrpjquota, "grpjquota="},
 841         {Opt_grpjquota, "grpjquota=%s"},
 842         {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
 843         {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
 844         {Opt_grpquota, "grpquota"},
 845         {Opt_noquota, "noquota"},
 846         {Opt_quota, "quota"},
 847         {Opt_usrquota, "usrquota"},
 848         {Opt_barrier, "barrier=%u"},
 849         {Opt_resize, "resize"},
 850         {Opt_err, NULL},
 851 };
 852
 853 static ext3_fsblk_t get_sb_block(void **data)
 854 {
 855         ext3_fsblk_t    sb_block;
 856         char            *options = (char *) *data;
 857
 858         if (!options || strncmp(options, "sb=", 3) != 0)
 859                 return 1;       /* Default location */
 860         options += 3;
 861         /*todo: use simple_strtoll with >32bit ext3 */
 862         sb_block = simple_strtoul(options, &options, 0);
 863         if (*options && *options != ',') {
 864                 printk("EXT3-fs: Invalid sb specification: %s\n",
 865                        (char *) *data);
 866                 return 1;
 867         }
 868         if (*options == ',')
 869                 options++;
 870         *data = (void *) options;
 871         return sb_block;
 872 }
 873
 874 static int parse_options (char *options, struct super_block *sb,
 875                           unsigned int *inum, unsigned long *journal_devnum,
 876                           ext3_fsblk_t *n_blocks_count, int is_remount)
 877 {
 878         struct ext3_sb_info *sbi = EXT3_SB(sb);
 879         char * p;
 880         substring_t args[MAX_OPT_ARGS];
 881         int data_opt = 0;
 882         int option;
 883 #ifdef CONFIG_QUOTA
 884         int qtype, qfmt;
 885         char *qname;
 886 #endif
 887
 888         if (!options)
 889                 return 1;
 890
 891         while ((p = strsep (&options, ",")) != NULL) {
 892                 int token;
 893                 if (!*p)
 894                         continue;
 895
 896                 token = match_token(p, tokens, args);
 897                 switch (token) {
 898                 case Opt_bsd_df:
 899                         clear_opt (sbi->s_mount_opt, MINIX_DF);
 900                         break;
 901                 case Opt_minix_df:
 902                         set_opt (sbi->s_mount_opt, MINIX_DF);
 903                         break;
 904                 case Opt_grpid:
 905                         set_opt (sbi->s_mount_opt, GRPID);
 906                         break;
 907                 case Opt_nogrpid:
 908                         clear_opt (sbi->s_mount_opt, GRPID);
 909                         break;
 910                 case Opt_resuid:
 911                         if (match_int(&args[0], &option))
 912                                 return 0;
 913                         sbi->s_resuid = option;
 914                         break;
 915                 case Opt_resgid:
 916                         if (match_int(&args[0], &option))
 917                                 return 0;
 918                         sbi->s_resgid = option;
 919                         break;
 920                 case Opt_sb:
 921                         /* handled by get_sb_block() instead of here */
 922                         /* *sb_block = match_int(&args[0]); */
 923                         break;
 924                 case Opt_err_panic:
 925                         clear_opt (sbi->s_mount_opt, ERRORS_CONT);
 926                         clear_opt (sbi->s_mount_opt, ERRORS_RO);
 927                         set_opt (sbi->s_mount_opt, ERRORS_PANIC);
 928                         break;
 929                 case Opt_err_ro:
 930                         clear_opt (sbi->s_mount_opt, ERRORS_CONT);
 931                         clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
 932                         set_opt (sbi->s_mount_opt, ERRORS_RO);
 933                         break;
 934                 case Opt_err_cont:
 935                         clear_opt (sbi->s_mount_opt, ERRORS_RO);
 936                         clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
 937                         set_opt (sbi->s_mount_opt, ERRORS_CONT);
 938                         break;
 939                 case Opt_nouid32:
 940                         set_opt (sbi->s_mount_opt, NO_UID32);
 941                         break;
 942                 case Opt_nocheck:
 943                         clear_opt (sbi->s_mount_opt, CHECK);
 944                         break;
 945                 case Opt_debug:
 946                         set_opt (sbi->s_mount_opt, DEBUG);
 947                         break;
 948                 case Opt_oldalloc:
 949                         set_opt (sbi->s_mount_opt, OLDALLOC);
 950                         break;
 951                 case Opt_orlov:
 952                         clear_opt (sbi->s_mount_opt, OLDALLOC);
 953                         break;
 954 #ifdef CONFIG_EXT3_FS_XATTR
 955                 case Opt_user_xattr:
 956                         set_opt (sbi->s_mount_opt, XATTR_USER);
 957                         break;
 958                 case Opt_nouser_xattr:
 959                         clear_opt (sbi->s_mount_opt, XATTR_USER);
 960                         break;
 961 #else
 962                 case Opt_user_xattr:
 963                 case Opt_nouser_xattr:
 964                         printk("EXT3 (no)user_xattr options not supported\n");
 965                         break;
 966 #endif
 967 #ifdef CONFIG_EXT3_FS_POSIX_ACL
 968                 case Opt_acl:
 969                         set_opt(sbi->s_mount_opt, POSIX_ACL);
 970                         break;
 971                 case Opt_noacl:
 972                         clear_opt(sbi->s_mount_opt, POSIX_ACL);
 973                         break;
 974 #else
 975                 case Opt_acl:
 976                 case Opt_noacl:
 977                         printk("EXT3 (no)acl options not supported\n");
 978                         break;
 979 #endif
 980                 case Opt_reservation:
 981                         set_opt(sbi->s_mount_opt, RESERVATION);
 982                         break;
 983                 case Opt_noreservation:
 984                         clear_opt(sbi->s_mount_opt, RESERVATION);
 985                         break;
 986                 case Opt_journal_update:
 987                         /* @@@ FIXME */
 988                         /* Eventually we will want to be able to create
 989                            a journal file here.  For now, only allow the
 990                            user to specify an existing inode to be the
 991                            journal file. */
 992                         if (is_remount) {
 993                                 printk(KERN_ERR "EXT3-fs: cannot specify "
 994                                        "journal on remount\n");
 995                                 return 0;
 996                         }
 997                         set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
 998                         break;
 999                 case Opt_journal_inum:
1000                         if (is_remount) {
1001                                 printk(KERN_ERR "EXT3-fs: cannot specify "
1002                                        "journal on remount\n");
1003                                 return 0;
1004                         }
1005                         if (match_int(&args[0], &option))
1006                                 return 0;
1007                         *inum = option;
1008                         break;
1009                 case Opt_journal_dev:
1010                         if (is_remount) {
1011                                 printk(KERN_ERR "EXT3-fs: cannot specify "
1012                                        "journal on remount\n");
1013                                 return 0;
1014                         }
1015                         if (match_int(&args[0], &option))
1016                                 return 0;
1017                         *journal_devnum = option;
1018                         break;
1019                 case Opt_noload:
1020                         set_opt (sbi->s_mount_opt, NOLOAD);
1021                         break;
1022                 case Opt_commit:
1023                         if (match_int(&args[0], &option))
1024                                 return 0;
1025                         if (option < 0)
1026                                 return 0;
1027                         if (option == 0)
1028                                 option = JBD_DEFAULT_MAX_COMMIT_AGE;
1029                         sbi->s_commit_interval = HZ * option;
1030                         break;
1031                 case Opt_data_journal:
1032                         data_opt = EXT3_MOUNT_JOURNAL_DATA;
1033                         goto datacheck;
1034                 case Opt_data_ordered:
1035                         data_opt = EXT3_MOUNT_ORDERED_DATA;
1036                         goto datacheck;
1037                 case Opt_data_writeback:
1038                         data_opt = EXT3_MOUNT_WRITEBACK_DATA;
1039                 datacheck:
1040                         if (is_remount) {
1041                                 if ((sbi->s_mount_opt & EXT3_MOUNT_DATA_FLAGS)
1042                                                 != data_opt) {
1043                                         printk(KERN_ERR
1044                                                 "EXT3-fs: cannot change data "
1045                                                 "mode on remount\n");
1046                                         return 0;
1047                                 }
1048                         } else {
1049                                 sbi->s_mount_opt &= ~EXT3_MOUNT_DATA_FLAGS;
1050                                 sbi->s_mount_opt |= data_opt;
1051                         }
1052                         break;
1053                 case Opt_data_err_abort:
1054                         set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1055                         break;
1056                 case Opt_data_err_ignore:
1057                         clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1058                         break;
1059 #ifdef CONFIG_QUOTA
1060                 case Opt_usrjquota:
1061                         qtype = USRQUOTA;
1062                         goto set_qf_name;
1063                 case Opt_grpjquota:
1064                         qtype = GRPQUOTA;
1065 set_qf_name:
1066                         if (sb_any_quota_loaded(sb) &&
1067                             !sbi->s_qf_names[qtype]) {
1068                                 printk(KERN_ERR
1069                                         "EXT3-fs: Cannot change journaled "
1070                                         "quota options when quota turned on.\n");
1071                                 return 0;
1072                         }
1073                         qname = match_strdup(&args[0]);
1074                         if (!qname) {
1075                                 printk(KERN_ERR
1076                                         "EXT3-fs: not enough memory for "
1077                                         "storing quotafile name.\n");
1078                                 return 0;
1079                         }
1080                         if (sbi->s_qf_names[qtype] &&
1081                             strcmp(sbi->s_qf_names[qtype], qname)) {
1082                                 printk(KERN_ERR
1083                                         "EXT3-fs: %s quota file already "
1084                                         "specified.\n", QTYPE2NAME(qtype));
1085                                 kfree(qname);
1086                                 return 0;
1087                         }
1088                         sbi->s_qf_names[qtype] = qname;
1089                         if (strchr(sbi->s_qf_names[qtype], '/')) {
1090                                 printk(KERN_ERR
1091                                         "EXT3-fs: quotafile must be on "
1092                                         "filesystem root.\n");
1093                                 kfree(sbi->s_qf_names[qtype]);
1094                                 sbi->s_qf_names[qtype] = NULL;
1095                                 return 0;
1096                         }
1097                         set_opt(sbi->s_mount_opt, QUOTA);
1098                         break;
1099                 case Opt_offusrjquota:
1100                         qtype = USRQUOTA;
1101                         goto clear_qf_name;
1102                 case Opt_offgrpjquota:
1103                         qtype = GRPQUOTA;
1104 clear_qf_name:
1105                         if (sb_any_quota_loaded(sb) &&
1106                             sbi->s_qf_names[qtype]) {
1107                                 printk(KERN_ERR "EXT3-fs: Cannot change "
1108                                         "journaled quota options when "
1109                                         "quota turned on.\n");
1110                                 return 0;
1111                         }
1112                         /*
1113                          * The space will be released later when all options
1114                          * are confirmed to be correct
1115                          */
1116                         sbi->s_qf_names[qtype] = NULL;
1117                         break;
1118                 case Opt_jqfmt_vfsold:
1119                         qfmt = QFMT_VFS_OLD;
1120                         goto set_qf_format;
1121                 case Opt_jqfmt_vfsv0:
1122                         qfmt = QFMT_VFS_V0;
1123 set_qf_format:
1124                         if (sb_any_quota_loaded(sb) &&
1125                             sbi->s_jquota_fmt != qfmt) {
1126                                 printk(KERN_ERR "EXT3-fs: Cannot change "
1127                                         "journaled quota options when "
1128                                         "quota turned on.\n");
1129                                 return 0;
1130                         }
1131                         sbi->s_jquota_fmt = qfmt;
1132                         break;
1133                 case Opt_quota:
1134                 case Opt_usrquota:
1135                         set_opt(sbi->s_mount_opt, QUOTA);
1136                         set_opt(sbi->s_mount_opt, USRQUOTA);
1137                         break;
1138                 case Opt_grpquota:
1139                         set_opt(sbi->s_mount_opt, QUOTA);
1140                         set_opt(sbi->s_mount_opt, GRPQUOTA);
1141                         break;
1142                 case Opt_noquota:
1143                         if (sb_any_quota_loaded(sb)) {
1144                                 printk(KERN_ERR "EXT3-fs: Cannot change quota "
1145                                         "options when quota turned on.\n");
1146                                 return 0;
1147                         }
1148                         clear_opt(sbi->s_mount_opt, QUOTA);
1149                         clear_opt(sbi->s_mount_opt, USRQUOTA);
1150                         clear_opt(sbi->s_mount_opt, GRPQUOTA);
1151                         break;
1152 #else
1153                 case Opt_quota:
1154                 case Opt_usrquota:
1155                 case Opt_grpquota:
1156                         printk(KERN_ERR
1157                                 "EXT3-fs: quota options not supported.\n");
1158                         break;
1159                 case Opt_usrjquota:
1160                 case Opt_grpjquota:
1161                 case Opt_offusrjquota:
1162                 case Opt_offgrpjquota:
1163                 case Opt_jqfmt_vfsold:
1164                 case Opt_jqfmt_vfsv0:
1165                         printk(KERN_ERR
1166                                 "EXT3-fs: journaled quota options not "
1167                                 "supported.\n");
1168                         break;
1169                 case Opt_noquota:
1170                         break;
1171 #endif
1172                 case Opt_abort:
1173                         set_opt(sbi->s_mount_opt, ABORT);
1174                         break;
1175                 case Opt_barrier:
1176                         if (match_int(&args[0], &option))
1177                                 return 0;
1178                         if (option)
1179                                 set_opt(sbi->s_mount_opt, BARRIER);
1180                         else
1181                                 clear_opt(sbi->s_mount_opt, BARRIER);
1182                         break;
1183                 case Opt_ignore:
1184                         break;
1185                 case Opt_resize:
1186                         if (!is_remount) {
1187                                 printk("EXT3-fs: resize option only available "
1188                                         "for remount\n");
1189                                 return 0;
1190                         }
1191                         if (match_int(&args[0], &option) != 0)
1192                                 return 0;
1193                         *n_blocks_count = option;
1194                         break;
1195                 case Opt_nobh:
1196                         set_opt(sbi->s_mount_opt, NOBH);
1197                         break;
1198                 case Opt_bh:
1199                         clear_opt(sbi->s_mount_opt, NOBH);
1200                         break;
1201                 default:
1202                         printk (KERN_ERR
1203                                 "EXT3-fs: Unrecognized mount option \"%s\" "
1204                                 "or missing value\n", p);
1205                         return 0;
1206                 }
1207         }
1208 #ifdef CONFIG_QUOTA
1209         if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1210                 if ((sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA) &&
1211                      sbi->s_qf_names[USRQUOTA])
1212                         clear_opt(sbi->s_mount_opt, USRQUOTA);
1213
1214                 if ((sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA) &&
1215                      sbi->s_qf_names[GRPQUOTA])
1216                         clear_opt(sbi->s_mount_opt, GRPQUOTA);
1217
1218                 if ((sbi->s_qf_names[USRQUOTA] &&
1219                                 (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)) ||
1220                     (sbi->s_qf_names[GRPQUOTA] &&
1221                                 (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA))) {
1222                         printk(KERN_ERR "EXT3-fs: old and new quota "
1223                                         "format mixing.\n");
1224                         return 0;
1225                 }
1226
1227                 if (!sbi->s_jquota_fmt) {
1228                         printk(KERN_ERR "EXT3-fs: journaled quota format "
1229                                         "not specified.\n");
1230                         return 0;
1231                 }
1232         } else {
1233                 if (sbi->s_jquota_fmt) {
1234                         printk(KERN_ERR "EXT3-fs: journaled quota format "
1235                                         "specified with no journaling "
1236                                         "enabled.\n");
1237                         return 0;
1238                 }
1239         }
1240 #endif
1241         return 1;
1242 }
1243
1244 static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1245                             int read_only)
1246 {
1247         struct ext3_sb_info *sbi = EXT3_SB(sb);
1248         int res = 0;
1249
1250         if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
1251                 printk (KERN_ERR "EXT3-fs warning: revision level too high, "
1252                         "forcing read-only mode\n");
1253                 res = MS_RDONLY;
1254         }
1255         if (read_only)
1256                 return res;
1257         if (!(sbi->s_mount_state & EXT3_VALID_FS))
1258                 printk (KERN_WARNING "EXT3-fs warning: mounting unchecked fs, "
1259                         "running e2fsck is recommended\n");
1260         else if ((sbi->s_mount_state & EXT3_ERROR_FS))
1261                 printk (KERN_WARNING
1262                         "EXT3-fs warning: mounting fs with errors, "
1263                         "running e2fsck is recommended\n");
1264         else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1265                  le16_to_cpu(es->s_mnt_count) >=
1266                  (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1267                 printk (KERN_WARNING
1268                         "EXT3-fs warning: maximal mount count reached, "
1269                         "running e2fsck is recommended\n");
1270         else if (le32_to_cpu(es->s_checkinterval) &&
1271                 (le32_to_cpu(es->s_lastcheck) +
1272                         le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1273                 printk (KERN_WARNING
1274                         "EXT3-fs warning: checktime reached, "
1275                         "running e2fsck is recommended\n");
1276 #if 0
1277                 /* @@@ We _will_ want to clear the valid bit if we find
1278                    inconsistencies, to force a fsck at reboot.  But for
1279                    a plain journaled filesystem we can keep it set as
1280                    valid forever! :) */
1281         es->s_state &= cpu_to_le16(~EXT3_VALID_FS);
1282 #endif
1283         if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1284                 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
1285         le16_add_cpu(&es->s_mnt_count, 1);
1286         es->s_mtime = cpu_to_le32(get_seconds());
1287         ext3_update_dynamic_rev(sb);
1288         EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1289
1290         ext3_commit_super(sb, es, 1);
1291         if (test_opt(sb, DEBUG))
1292                 printk(KERN_INFO "[EXT3 FS bs=%lu, gc=%lu, "
1293                                 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1294                         sb->s_blocksize,
1295                         sbi->s_groups_count,
1296                         EXT3_BLOCKS_PER_GROUP(sb),
1297                         EXT3_INODES_PER_GROUP(sb),
1298                         sbi->s_mount_opt);
1299
1300         printk(KERN_INFO "EXT3 FS on %s, ", sb->s_id);
1301         if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1302                 char b[BDEVNAME_SIZE];
1303
1304                 printk("external journal on %s\n",
1305                         bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1306         } else {
1307                 printk("internal journal\n");
1308         }
1309         return res;
1310 }
1311
1312 /* Called at mount-time, super-block is locked */
1313 static int ext3_check_descriptors(struct super_block *sb)
1314 {
1315         struct ext3_sb_info *sbi = EXT3_SB(sb);
1316         int i;
1317
1318         ext3_debug ("Checking group descriptors");
1319
1320         for (i = 0; i < sbi->s_groups_count; i++) {
1321                 struct ext3_group_desc *gdp = ext3_get_group_desc(sb, i, NULL);
1322                 ext3_fsblk_t first_block = ext3_group_first_block_no(sb, i);
1323                 ext3_fsblk_t last_block;
1324
1325                 if (i == sbi->s_groups_count - 1)
1326                         last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
1327                 else
1328                         last_block = first_block +
1329                                 (EXT3_BLOCKS_PER_GROUP(sb) - 1);
1330
1331                 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
1332                     le32_to_cpu(gdp->bg_block_bitmap) > last_block)
1333                 {
1334                         ext3_error (sb, "ext3_check_descriptors",
1335                                     "Block bitmap for group %d"
1336                                     " not in group (block %lu)!",
1337                                     i, (unsigned long)
1338                                         le32_to_cpu(gdp->bg_block_bitmap));
1339                         return 0;
1340                 }
1341                 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
1342                     le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
1343                 {
1344                         ext3_error (sb, "ext3_check_descriptors",
1345                                     "Inode bitmap for group %d"
1346                                     " not in group (block %lu)!",
1347                                     i, (unsigned long)
1348                                         le32_to_cpu(gdp->bg_inode_bitmap));
1349                         return 0;
1350                 }
1351                 if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
1352                     le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
1353                     last_block)
1354                 {
1355                         ext3_error (sb, "ext3_check_descriptors",
1356                                     "Inode table for group %d"
1357                                     " not in group (block %lu)!",
1358                                     i, (unsigned long)
1359                                         le32_to_cpu(gdp->bg_inode_table));
1360                         return 0;
1361                 }
1362         }
1363
1364         sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1365         sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1366         return 1;
1367 }
1368
1369
1370 /* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1371  * the superblock) which were deleted from all directories, but held open by
1372  * a process at the time of a crash.  We walk the list and try to delete these
1373  * inodes at recovery time (only with a read-write filesystem).
1374  *
1375  * In order to keep the orphan inode chain consistent during traversal (in
1376  * case of crash during recovery), we link each inode into the superblock
1377  * orphan list_head and handle it the same way as an inode deletion during
1378  * normal operation (which journals the operations for us).
1379  *
1380  * We only do an iget() and an iput() on each inode, which is very safe if we
1381  * accidentally point at an in-use or already deleted inode.  The worst that
1382  * can happen in this case is that we get a "bit already cleared" message from
1383  * ext3_free_inode().  The only reason we would point at a wrong inode is if
1384  * e2fsck was run on this filesystem, and it must have already done the orphan
1385  * inode cleanup for us, so we can safely abort without any further action.
1386  */
1387 static void ext3_orphan_cleanup (struct super_block * sb,
1388                                  struct ext3_super_block * es)
1389 {
1390         unsigned int s_flags = sb->s_flags;
1391         int nr_orphans = 0, nr_truncates = 0;
1392 #ifdef CONFIG_QUOTA
1393         int i;
1394 #endif
1395         if (!es->s_last_orphan) {
1396                 jbd_debug(4, "no orphan inodes to clean up\n");
1397                 return;
1398         }
1399
1400         if (bdev_read_only(sb->s_bdev)) {
1401                 printk(KERN_ERR "EXT3-fs: write access "
1402                         "unavailable, skipping orphan cleanup.\n");
1403                 return;
1404         }
1405
1406         if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1407                 if (es->s_last_orphan)
1408                         jbd_debug(1, "Errors on filesystem, "
1409                                   "clearing orphan list.\n");
1410                 es->s_last_orphan = 0;
1411                 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1412                 return;
1413         }
1414
1415         if (s_flags & MS_RDONLY) {
1416                 printk(KERN_INFO "EXT3-fs: %s: orphan cleanup on readonly fs\n",
1417                        sb->s_id);
1418                 sb->s_flags &= ~MS_RDONLY;
1419         }
1420 #ifdef CONFIG_QUOTA
1421         /* Needed for iput() to work correctly and not trash data */
1422         sb->s_flags |= MS_ACTIVE;
1423         /* Turn on quotas so that they are updated correctly */
1424         for (i = 0; i < MAXQUOTAS; i++) {
1425                 if (EXT3_SB(sb)->s_qf_names[i]) {
1426                         int ret = ext3_quota_on_mount(sb, i);
1427                         if (ret < 0)
1428                                 printk(KERN_ERR
1429                                         "EXT3-fs: Cannot turn on journaled "
1430                                         "quota: error %d\n", ret);
1431                 }
1432         }
1433 #endif
1434
1435         while (es->s_last_orphan) {
1436                 struct inode *inode;
1437
1438                 inode = ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1439                 if (IS_ERR(inode)) {
1440                         es->s_last_orphan = 0;
1441                         break;
1442                 }
1443
1444                 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1445                 vfs_dq_init(inode);
1446                 if (inode->i_nlink) {
1447                         printk(KERN_DEBUG
1448                                 "%s: truncating inode %lu to %Ld bytes\n",
1449                                 __func__, inode->i_ino, inode->i_size);
1450                         jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1451                                   inode->i_ino, inode->i_size);
1452                         ext3_truncate(inode);
1453                         nr_truncates++;
1454                 } else {
1455                         printk(KERN_DEBUG
1456                                 "%s: deleting unreferenced inode %lu\n",
1457                                 __func__, inode->i_ino);
1458                         jbd_debug(2, "deleting unreferenced inode %lu\n",
1459                                   inode->i_ino);
1460                         nr_orphans++;
1461                 }
1462                 iput(inode);  /* The delete magic happens here! */
1463         }
1464
1465 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1466
1467         if (nr_orphans)
1468                 printk(KERN_INFO "EXT3-fs: %s: %d orphan inode%s deleted\n",
1469                        sb->s_id, PLURAL(nr_orphans));
1470         if (nr_truncates)
1471                 printk(KERN_INFO "EXT3-fs: %s: %d truncate%s cleaned up\n",
1472                        sb->s_id, PLURAL(nr_truncates));
1473 #ifdef CONFIG_QUOTA
1474         /* Turn quotas off */
1475         for (i = 0; i < MAXQUOTAS; i++) {
1476                 if (sb_dqopt(sb)->files[i])
1477                         vfs_quota_off(sb, i, 0);
1478         }
1479 #endif
1480         sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1481 }
1482
1483 /*
1484  * Maximal file size.  There is a direct, and {,double-,triple-}indirect
1485  * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1486  * We need to be 1 filesystem block less than the 2^32 sector limit.
1487  */
1488 static loff_t ext3_max_size(int bits)
1489 {
1490         loff_t res = EXT3_NDIR_BLOCKS;
1491         int meta_blocks;
1492         loff_t upper_limit;
1493
1494         /* This is calculated to be the largest file size for a
1495          * dense, file such that the total number of
1496          * sectors in the file, including data and all indirect blocks,
1497          * does not exceed 2^32 -1
1498          * __u32 i_blocks representing the total number of
1499          * 512 bytes blocks of the file
1500          */
1501         upper_limit = (1LL << 32) - 1;
1502
1503         /* total blocks in file system block size */
1504         upper_limit >>= (bits - 9);
1505
1506
1507         /* indirect blocks */
1508         meta_blocks = 1;
1509         /* double indirect blocks */
1510         meta_blocks += 1 + (1LL << (bits-2));
1511         /* tripple indirect blocks */
1512         meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1513
1514         upper_limit -= meta_blocks;
1515         upper_limit <<= bits;
1516
1517         res += 1LL << (bits-2);
1518         res += 1LL << (2*(bits-2));
1519         res += 1LL << (3*(bits-2));
1520         res <<= bits;
1521         if (res > upper_limit)
1522                 res = upper_limit;
1523
1524         if (res > MAX_LFS_FILESIZE)
1525                 res = MAX_LFS_FILESIZE;
1526
1527         return res;
1528 }
1529
1530 static ext3_fsblk_t descriptor_loc(struct super_block *sb,
1531                                     ext3_fsblk_t logic_sb_block,
1532                                     int nr)
1533 {
1534         struct ext3_sb_info *sbi = EXT3_SB(sb);
1535         unsigned long bg, first_meta_bg;
1536         int has_super = 0;
1537
1538         first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1539
1540         if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1541             nr < first_meta_bg)
1542                 return (logic_sb_block + nr + 1);
1543         bg = sbi->s_desc_per_block * nr;
1544         if (ext3_bg_has_super(sb, bg))
1545                 has_super = 1;
1546         return (has_super + ext3_group_first_block_no(sb, bg));
1547 }
1548
1549
1550 static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1551 {
1552         struct buffer_head * bh;
1553         struct ext3_super_block *es = NULL;
1554         struct ext3_sb_info *sbi;
1555         ext3_fsblk_t block;
1556         ext3_fsblk_t sb_block = get_sb_block(&data);
1557         ext3_fsblk_t logic_sb_block;
1558         unsigned long offset = 0;
1559         unsigned int journal_inum = 0;
1560         unsigned long journal_devnum = 0;
1561         unsigned long def_mount_opts;
1562         struct inode *root;
1563         int blocksize;
1564         int hblock;
1565         int db_count;
1566         int i;
1567         int needs_recovery;
1568         int ret = -EINVAL;
1569         __le32 features;
1570         int err;
1571
1572         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1573         if (!sbi)
1574                 return -ENOMEM;
1575
1576         sbi->s_blockgroup_lock =
1577                 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
1578         if (!sbi->s_blockgroup_lock) {
1579                 kfree(sbi);
1580                 return -ENOMEM;
1581         }
1582         sb->s_fs_info = sbi;
1583         sbi->s_mount_opt = 0;
1584         sbi->s_resuid = EXT3_DEF_RESUID;
1585         sbi->s_resgid = EXT3_DEF_RESGID;
1586         sbi->s_sb_block = sb_block;
1587
1588         unlock_kernel();
1589
1590         blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1591         if (!blocksize) {
1592                 printk(KERN_ERR "EXT3-fs: unable to set blocksize\n");
1593                 goto out_fail;
1594         }
1595
1596         /*
1597          * The ext3 superblock will not be buffer aligned for other than 1kB
1598          * block sizes.  We need to calculate the offset from buffer start.
1599          */
1600         if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1601                 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1602                 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1603         } else {
1604                 logic_sb_block = sb_block;
1605         }
1606
1607         if (!(bh = sb_bread(sb, logic_sb_block))) {
1608                 printk (KERN_ERR "EXT3-fs: unable to read superblock\n");
1609                 goto out_fail;
1610         }
1611         /*
1612          * Note: s_es must be initialized as soon as possible because
1613          *       some ext3 macro-instructions depend on its value
1614          */
1615         es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1616         sbi->s_es = es;
1617         sb->s_magic = le16_to_cpu(es->s_magic);
1618         if (sb->s_magic != EXT3_SUPER_MAGIC)
1619                 goto cantfind_ext3;
1620
1621         /* Set defaults before we parse the mount options */
1622         def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1623         if (def_mount_opts & EXT3_DEFM_DEBUG)
1624                 set_opt(sbi->s_mount_opt, DEBUG);
1625         if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1626                 set_opt(sbi->s_mount_opt, GRPID);
1627         if (def_mount_opts & EXT3_DEFM_UID16)
1628                 set_opt(sbi->s_mount_opt, NO_UID32);
1629 #ifdef CONFIG_EXT3_FS_XATTR
1630         if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1631                 set_opt(sbi->s_mount_opt, XATTR_USER);
1632 #endif
1633 #ifdef CONFIG_EXT3_FS_POSIX_ACL
1634         if (def_mount_opts & EXT3_DEFM_ACL)
1635                 set_opt(sbi->s_mount_opt, POSIX_ACL);
1636 #endif
1637         if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1638                 sbi->s_mount_opt |= EXT3_MOUNT_JOURNAL_DATA;
1639         else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1640                 sbi->s_mount_opt |= EXT3_MOUNT_ORDERED_DATA;
1641         else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1642                 sbi->s_mount_opt |= EXT3_MOUNT_WRITEBACK_DATA;
1643
1644         if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1645                 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1646         else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_CONTINUE)
1647                 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1648         else
1649                 set_opt(sbi->s_mount_opt, ERRORS_RO);
1650
1651         sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1652         sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1653
1654         set_opt(sbi->s_mount_opt, RESERVATION);
1655
1656         if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1657                             NULL, 0))
1658                 goto failed_mount;
1659
1660         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1661                 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1662
1663         if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1664             (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1665              EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1666              EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1667                 printk(KERN_WARNING
1668                        "EXT3-fs warning: feature flags set on rev 0 fs, "
1669                        "running e2fsck is recommended\n");
1670         /*
1671          * Check feature flags regardless of the revision level, since we
1672          * previously didn't change the revision level when setting the flags,
1673          * so there is a chance incompat flags are set on a rev 0 filesystem.
1674          */
1675         features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1676         if (features) {
1677                 printk(KERN_ERR "EXT3-fs: %s: couldn't mount because of "
1678                        "unsupported optional features (%x).\n",
1679                        sb->s_id, le32_to_cpu(features));
1680                 goto failed_mount;
1681         }
1682         features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1683         if (!(sb->s_flags & MS_RDONLY) && features) {
1684                 printk(KERN_ERR "EXT3-fs: %s: couldn't mount RDWR because of "
1685                        "unsupported optional features (%x).\n",
1686                        sb->s_id, le32_to_cpu(features));
1687                 goto failed_mount;
1688         }
1689         blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1690
1691         if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1692             blocksize > EXT3_MAX_BLOCK_SIZE) {
1693                 printk(KERN_ERR
1694                        "EXT3-fs: Unsupported filesystem blocksize %d on %s.\n",
1695                        blocksize, sb->s_id);
1696                 goto failed_mount;
1697         }
1698
1699         hblock = bdev_logical_block_size(sb->s_bdev);
1700         if (sb->s_blocksize != blocksize) {
1701                 /*
1702                  * Make sure the blocksize for the filesystem is larger
1703                  * than the hardware sectorsize for the machine.
1704                  */
1705                 if (blocksize < hblock) {
1706                         printk(KERN_ERR "EXT3-fs: blocksize %d too small for "
1707                                "device blocksize %d.\n", blocksize, hblock);
1708                         goto failed_mount;
1709                 }
1710
1711                 brelse (bh);
1712                 if (!sb_set_blocksize(sb, blocksize)) {
1713                         printk(KERN_ERR "EXT3-fs: bad blocksize %d.\n",
1714                                 blocksize);
1715                         goto out_fail;
1716                 }
1717                 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1718                 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1719                 bh = sb_bread(sb, logic_sb_block);
1720                 if (!bh) {
1721                         printk(KERN_ERR
1722                                "EXT3-fs: Can't read superblock on 2nd try.\n");
1723                         goto failed_mount;
1724                 }
1725                 es = (struct ext3_super_block *)(((char *)bh->b_data) + offset);
1726                 sbi->s_es = es;
1727                 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
1728                         printk (KERN_ERR
1729                                 "EXT3-fs: Magic mismatch, very weird !\n");
1730                         goto failed_mount;
1731                 }
1732         }
1733
1734         sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1735
1736         if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1737                 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1738                 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1739         } else {
1740                 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1741                 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1742                 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
1743                     (!is_power_of_2(sbi->s_inode_size)) ||
1744                     (sbi->s_inode_size > blocksize)) {
1745                         printk (KERN_ERR
1746                                 "EXT3-fs: unsupported inode size: %d\n",
1747                                 sbi->s_inode_size);
1748                         goto failed_mount;
1749                 }
1750         }
1751         sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1752                                    le32_to_cpu(es->s_log_frag_size);
1753         if (blocksize != sbi->s_frag_size) {
1754                 printk(KERN_ERR
1755                        "EXT3-fs: fragsize %lu != blocksize %u (unsupported)\n",
1756                        sbi->s_frag_size, blocksize);
1757                 goto failed_mount;
1758         }
1759         sbi->s_frags_per_block = 1;
1760         sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1761         sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1762         sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1763         if (EXT3_INODE_SIZE(sb) == 0 || EXT3_INODES_PER_GROUP(sb) == 0)
1764                 goto cantfind_ext3;
1765         sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1766         if (sbi->s_inodes_per_block == 0)
1767                 goto cantfind_ext3;
1768         sbi->s_itb_per_group = sbi->s_inodes_per_group /
1769                                         sbi->s_inodes_per_block;
1770         sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1771         sbi->s_sbh = bh;
1772         sbi->s_mount_state = le16_to_cpu(es->s_state);
1773         sbi->s_addr_per_block_bits = ilog2(EXT3_ADDR_PER_BLOCK(sb));
1774         sbi->s_desc_per_block_bits = ilog2(EXT3_DESC_PER_BLOCK(sb));
1775         for (i=0; i < 4; i++)
1776                 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1777         sbi->s_def_hash_version = es->s_def_hash_version;
1778         i = le32_to_cpu(es->s_flags);
1779         if (i & EXT2_FLAGS_UNSIGNED_HASH)
1780                 sbi->s_hash_unsigned = 3;
1781         else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
1782 #ifdef __CHAR_UNSIGNED__
1783                 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
1784                 sbi->s_hash_unsigned = 3;
1785 #else
1786                 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
1787 #endif
1788                 sb->s_dirt = 1;
1789         }
1790
1791         if (sbi->s_blocks_per_group > blocksize * 8) {
1792                 printk (KERN_ERR
1793                         "EXT3-fs: #blocks per group too big: %lu\n",
1794                         sbi->s_blocks_per_group);
1795                 goto failed_mount;
1796         }
1797         if (sbi->s_frags_per_group > blocksize * 8) {
1798                 printk (KERN_ERR
1799                         "EXT3-fs: #fragments per group too big: %lu\n",
1800                         sbi->s_frags_per_group);
1801                 goto failed_mount;
1802         }
1803         if (sbi->s_inodes_per_group > blocksize * 8) {
1804                 printk (KERN_ERR
1805                         "EXT3-fs: #inodes per group too big: %lu\n",
1806                         sbi->s_inodes_per_group);
1807                 goto failed_mount;
1808         }
1809
1810         if (le32_to_cpu(es->s_blocks_count) >
1811                     (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
1812                 printk(KERN_ERR "EXT3-fs: filesystem on %s:"
1813                         " too large to mount safely\n", sb->s_id);
1814                 if (sizeof(sector_t) < 8)
1815                         printk(KERN_WARNING "EXT3-fs: CONFIG_LBD not "
1816                                         "enabled\n");
1817                 goto failed_mount;
1818         }
1819
1820         if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1821                 goto cantfind_ext3;
1822         sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
1823                                le32_to_cpu(es->s_first_data_block) - 1)
1824                                        / EXT3_BLOCKS_PER_GROUP(sb)) + 1;
1825         db_count = (sbi->s_groups_count + EXT3_DESC_PER_BLOCK(sb) - 1) /
1826                    EXT3_DESC_PER_BLOCK(sb);
1827         sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1828                                     GFP_KERNEL);
1829         if (sbi->s_group_desc == NULL) {
1830                 printk (KERN_ERR "EXT3-fs: not enough memory\n");
1831                 goto failed_mount;
1832         }
1833
1834         bgl_lock_init(sbi->s_blockgroup_lock);
1835
1836         for (i = 0; i < db_count; i++) {
1837                 block = descriptor_loc(sb, logic_sb_block, i);
1838                 sbi->s_group_desc[i] = sb_bread(sb, block);
1839                 if (!sbi->s_group_desc[i]) {
1840                         printk (KERN_ERR "EXT3-fs: "
1841                                 "can't read group descriptor %d\n", i);
1842                         db_count = i;
1843                         goto failed_mount2;
1844                 }
1845         }
1846         if (!ext3_check_descriptors (sb)) {
1847                 printk(KERN_ERR "EXT3-fs: group descriptors corrupted!\n");
1848                 goto failed_mount2;
1849         }
1850         sbi->s_gdb_count = db_count;
1851         get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1852         spin_lock_init(&sbi->s_next_gen_lock);
1853
1854         err = percpu_counter_init(&sbi->s_freeblocks_counter,
1855                         ext3_count_free_blocks(sb));
1856         if (!err) {
1857                 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1858                                 ext3_count_free_inodes(sb));
1859         }
1860         if (!err) {
1861                 err = percpu_counter_init(&sbi->s_dirs_counter,
1862                                 ext3_count_dirs(sb));
1863         }
1864         if (err) {
1865                 printk(KERN_ERR "EXT3-fs: insufficient memory\n");
1866                 goto failed_mount3;
1867         }
1868
1869         /* per fileystem reservation list head & lock */
1870         spin_lock_init(&sbi->s_rsv_window_lock);
1871         sbi->s_rsv_window_root = RB_ROOT;
1872         /* Add a single, static dummy reservation to the start of the
1873          * reservation window list --- it gives us a placeholder for
1874          * append-at-start-of-list which makes the allocation logic
1875          * _much_ simpler. */
1876         sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1877         sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1878         sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1879         sbi->s_rsv_window_head.rsv_goal_size = 0;
1880         ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1881
1882         /*
1883          * set up enough so that it can read an inode
1884          */
1885         sb->s_op = &ext3_sops;
1886         sb->s_export_op = &ext3_export_ops;
1887         sb->s_xattr = ext3_xattr_handlers;
1888 #ifdef CONFIG_QUOTA
1889         sb->s_qcop = &ext3_qctl_operations;
1890         sb->dq_op = &ext3_quota_operations;
1891 #endif
1892         INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1893
1894         sb->s_root = NULL;
1895
1896         needs_recovery = (es->s_last_orphan != 0 ||
1897                           EXT3_HAS_INCOMPAT_FEATURE(sb,
1898                                     EXT3_FEATURE_INCOMPAT_RECOVER));
1899
1900         /*
1901          * The first inode we look at is the journal inode.  Don't try
1902          * root first: it may be modified in the journal!
1903          */
1904         if (!test_opt(sb, NOLOAD) &&
1905             EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
1906                 if (ext3_load_journal(sb, es, journal_devnum))
1907                         goto failed_mount3;
1908         } else if (journal_inum) {
1909                 if (ext3_create_journal(sb, es, journal_inum))
1910                         goto failed_mount3;
1911         } else {
1912                 if (!silent)
1913                         printk (KERN_ERR
1914                                 "ext3: No journal on filesystem on %s\n",
1915                                 sb->s_id);
1916                 goto failed_mount3;
1917         }
1918
1919         /* We have now updated the journal if required, so we can
1920          * validate the data journaling mode. */
1921         switch (test_opt(sb, DATA_FLAGS)) {
1922         case 0:
1923                 /* No mode set, assume a default based on the journal
1924                    capabilities: ORDERED_DATA if the journal can
1925                    cope, else JOURNAL_DATA */
1926                 if (journal_check_available_features
1927                     (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
1928                         set_opt(sbi->s_mount_opt, DEFAULT_DATA_MODE);
1929                 else
1930                         set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1931                 break;
1932
1933         case EXT3_MOUNT_ORDERED_DATA:
1934         case EXT3_MOUNT_WRITEBACK_DATA:
1935                 if (!journal_check_available_features
1936                     (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
1937                         printk(KERN_ERR "EXT3-fs: Journal does not support "
1938                                "requested data journaling mode\n");
1939                         goto failed_mount4;
1940                 }
1941         default:
1942                 break;
1943         }
1944
1945         if (test_opt(sb, NOBH)) {
1946                 if (!(test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)) {
1947                         printk(KERN_WARNING "EXT3-fs: Ignoring nobh option - "
1948                                 "its supported only with writeback mode\n");
1949                         clear_opt(sbi->s_mount_opt, NOBH);
1950                 }
1951         }
1952         /*
1953          * The journal_load will have done any necessary log recovery,
1954          * so we can safely mount the rest of the filesystem now.
1955          */
1956
1957         root = ext3_iget(sb, EXT3_ROOT_INO);
1958         if (IS_ERR(root)) {
1959                 printk(KERN_ERR "EXT3-fs: get root inode failed\n");
1960                 ret = PTR_ERR(root);
1961                 goto failed_mount4;
1962         }
1963         if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1964                 iput(root);
1965                 printk(KERN_ERR "EXT3-fs: corrupt root inode, run e2fsck\n");
1966                 goto failed_mount4;
1967         }
1968         sb->s_root = d_alloc_root(root);
1969         if (!sb->s_root) {
1970                 printk(KERN_ERR "EXT3-fs: get root dentry failed\n");
1971                 iput(root);
1972                 ret = -ENOMEM;
1973                 goto failed_mount4;
1974         }
1975
1976         ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
1977         /*
1978          * akpm: core read_super() calls in here with the superblock locked.
1979          * That deadlocks, because orphan cleanup needs to lock the superblock
1980          * in numerous places.  Here we just pop the lock - it's relatively
1981          * harmless, because we are now ready to accept write_super() requests,
1982          * and aviro says that's the only reason for hanging onto the
1983          * superblock lock.
1984          */
1985         EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
1986         ext3_orphan_cleanup(sb, es);
1987         EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
1988         if (needs_recovery)
1989                 printk (KERN_INFO "EXT3-fs: recovery complete.\n");
1990         ext3_mark_recovery_complete(sb, es);
1991         printk (KERN_INFO "EXT3-fs: mounted filesystem with %s data mode.\n",
1992                 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
1993                 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
1994                 "writeback");
1995
1996         lock_kernel();
1997         return 0;
1998
1999 cantfind_ext3:
2000         if (!silent)
2001                 printk(KERN_ERR "VFS: Can't find ext3 filesystem on dev %s.\n",
2002                        sb->s_id);
2003         goto failed_mount;
2004
2005 failed_mount4:
2006         journal_destroy(sbi->s_journal);
2007 failed_mount3:
2008         percpu_counter_destroy(&sbi->s_freeblocks_counter);
2009         percpu_counter_destroy(&sbi->s_freeinodes_counter);
2010         percpu_counter_destroy(&sbi->s_dirs_counter);
2011 failed_mount2:
2012         for (i = 0; i < db_count; i++)
2013                 brelse(sbi->s_group_desc[i]);
2014         kfree(sbi->s_group_desc);
2015 failed_mount:
2016 #ifdef CONFIG_QUOTA
2017         for (i = 0; i < MAXQUOTAS; i++)
2018                 kfree(sbi->s_qf_names[i]);
2019 #endif
2020         ext3_blkdev_remove(sbi);
2021         brelse(bh);
2022 out_fail:
2023         sb->s_fs_info = NULL;
2024         kfree(sbi->s_blockgroup_lock);
2025         kfree(sbi);
2026         lock_kernel();
2027         return ret;
2028 }
2029
2030 /*
2031  * Setup any per-fs journal parameters now.  We'll do this both on
2032  * initial mount, once the journal has been initialised but before we've
2033  * done any recovery; and again on any subsequent remount.
2034  */
2035 static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
2036 {
2037         struct ext3_sb_info *sbi = EXT3_SB(sb);
2038
2039         if (sbi->s_commit_interval)
2040                 journal->j_commit_interval = sbi->s_commit_interval;
2041         /* We could also set up an ext3-specific default for the commit
2042          * interval here, but for now we'll just fall back to the jbd
2043          * default. */
2044
2045         spin_lock(&journal->j_state_lock);
2046         if (test_opt(sb, BARRIER))
2047                 journal->j_flags |= JFS_BARRIER;
2048         else
2049                 journal->j_flags &= ~JFS_BARRIER;
2050         if (test_opt(sb, DATA_ERR_ABORT))
2051                 journal->j_flags |= JFS_ABORT_ON_SYNCDATA_ERR;
2052         else
2053                 journal->j_flags &= ~JFS_ABORT_ON_SYNCDATA_ERR;
2054         spin_unlock(&journal->j_state_lock);
2055 }
2056
2057 static journal_t *ext3_get_journal(struct super_block *sb,
2058                                    unsigned int journal_inum)
2059 {
2060         struct inode *journal_inode;
2061         journal_t *journal;
2062
2063         /* First, test for the existence of a valid inode on disk.  Bad
2064          * things happen if we iget() an unused inode, as the subsequent
2065          * iput() will try to delete it. */
2066
2067         journal_inode = ext3_iget(sb, journal_inum);
2068         if (IS_ERR(journal_inode)) {
2069                 printk(KERN_ERR "EXT3-fs: no journal found.\n");
2070                 return NULL;
2071         }
2072         if (!journal_inode->i_nlink) {
2073                 make_bad_inode(journal_inode);
2074                 iput(journal_inode);
2075                 printk(KERN_ERR "EXT3-fs: journal inode is deleted.\n");
2076                 return NULL;
2077         }
2078
2079         jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2080                   journal_inode, journal_inode->i_size);
2081         if (!S_ISREG(journal_inode->i_mode)) {
2082                 printk(KERN_ERR "EXT3-fs: invalid journal inode.\n");
2083                 iput(journal_inode);
2084                 return NULL;
2085         }
2086
2087         journal = journal_init_inode(journal_inode);
2088         if (!journal) {
2089                 printk(KERN_ERR "EXT3-fs: Could not load journal inode\n");
2090                 iput(journal_inode);
2091                 return NULL;
2092         }
2093         journal->j_private = sb;
2094         ext3_init_journal_params(sb, journal);
2095         return journal;
2096 }
2097
2098 static journal_t *ext3_get_dev_journal(struct super_block *sb,
2099                                        dev_t j_dev)
2100 {
2101         struct buffer_head * bh;
2102         journal_t *journal;
2103         ext3_fsblk_t start;
2104         ext3_fsblk_t len;
2105         int hblock, blocksize;
2106         ext3_fsblk_t sb_block;
2107         unsigned long offset;
2108         struct ext3_super_block * es;
2109         struct block_device *bdev;
2110
2111         bdev = ext3_blkdev_get(j_dev);
2112         if (bdev == NULL)
2113                 return NULL;
2114
2115         if (bd_claim(bdev, sb)) {
2116                 printk(KERN_ERR
2117                         "EXT3: failed to claim external journal device.\n");
2118                 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
2119                 return NULL;
2120         }
2121
2122         blocksize = sb->s_blocksize;
2123         hblock = bdev_logical_block_size(bdev);
2124         if (blocksize < hblock) {
2125                 printk(KERN_ERR
2126                         "EXT3-fs: blocksize too small for journal device.\n");
2127                 goto out_bdev;
2128         }
2129
2130         sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
2131         offset = EXT3_MIN_BLOCK_SIZE % blocksize;
2132         set_blocksize(bdev, blocksize);
2133         if (!(bh = __bread(bdev, sb_block, blocksize))) {
2134                 printk(KERN_ERR "EXT3-fs: couldn't read superblock of "
2135                        "external journal\n");
2136                 goto out_bdev;
2137         }
2138
2139         es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
2140         if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
2141             !(le32_to_cpu(es->s_feature_incompat) &
2142               EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2143                 printk(KERN_ERR "EXT3-fs: external journal has "
2144                                         "bad superblock\n");
2145                 brelse(bh);
2146                 goto out_bdev;
2147         }
2148
2149         if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2150                 printk(KERN_ERR "EXT3-fs: journal UUID does not match\n");
2151                 brelse(bh);
2152                 goto out_bdev;
2153         }
2154
2155         len = le32_to_cpu(es->s_blocks_count);
2156         start = sb_block + 1;
2157         brelse(bh);     /* we're done with the superblock */
2158
2159         journal = journal_init_dev(bdev, sb->s_bdev,
2160                                         start, len, blocksize);
2161         if (!journal) {
2162                 printk(KERN_ERR "EXT3-fs: failed to create device journal\n");
2163                 goto out_bdev;
2164         }
2165         journal->j_private = sb;
2166         ll_rw_block(READ, 1, &journal->j_sb_buffer);
2167         wait_on_buffer(journal->j_sb_buffer);
2168         if (!buffer_uptodate(journal->j_sb_buffer)) {
2169                 printk(KERN_ERR "EXT3-fs: I/O error on journal device\n");
2170                 goto out_journal;
2171         }
2172         if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
2173                 printk(KERN_ERR "EXT3-fs: External journal has more than one "
2174                                         "user (unsupported) - %d\n",
2175                         be32_to_cpu(journal->j_superblock->s_nr_users));
2176                 goto out_journal;
2177         }
2178         EXT3_SB(sb)->journal_bdev = bdev;
2179         ext3_init_journal_params(sb, journal);
2180         return journal;
2181 out_journal:
2182         journal_destroy(journal);
2183 out_bdev:
2184         ext3_blkdev_put(bdev);
2185         return NULL;
2186 }
2187
2188 static int ext3_load_journal(struct super_block *sb,
2189                              struct ext3_super_block *es,
2190                              unsigned long journal_devnum)
2191 {
2192         journal_t *journal;
2193         unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2194         dev_t journal_dev;
2195         int err = 0;
2196         int really_read_only;
2197
2198         if (journal_devnum &&
2199             journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2200                 printk(KERN_INFO "EXT3-fs: external journal device major/minor "
2201                         "numbers have changed\n");
2202                 journal_dev = new_decode_dev(journal_devnum);
2203         } else
2204                 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2205
2206         really_read_only = bdev_read_only(sb->s_bdev);
2207
2208         /*
2209          * Are we loading a blank journal or performing recovery after a
2210          * crash?  For recovery, we need to check in advance whether we
2211          * can get read-write access to the device.
2212          */
2213
2214         if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
2215                 if (sb->s_flags & MS_RDONLY) {
2216                         printk(KERN_INFO "EXT3-fs: INFO: recovery "
2217                                         "required on readonly filesystem.\n");
2218                         if (really_read_only) {
2219                                 printk(KERN_ERR "EXT3-fs: write access "
2220                                         "unavailable, cannot proceed.\n");
2221                                 return -EROFS;
2222                         }
2223                         printk (KERN_INFO "EXT3-fs: write access will "
2224                                         "be enabled during recovery.\n");
2225                 }
2226         }
2227
2228         if (journal_inum && journal_dev) {
2229                 printk(KERN_ERR "EXT3-fs: filesystem has both journal "
2230                        "and inode journals!\n");
2231                 return -EINVAL;
2232         }
2233
2234         if (journal_inum) {
2235                 if (!(journal = ext3_get_journal(sb, journal_inum)))
2236                         return -EINVAL;
2237         } else {
2238                 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
2239                         return -EINVAL;
2240         }
2241
2242         if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2243                 err = journal_update_format(journal);
2244                 if (err)  {
2245                         printk(KERN_ERR "EXT3-fs: error updating journal.\n");
2246                         journal_destroy(journal);
2247                         return err;
2248                 }
2249         }
2250
2251         if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
2252                 err = journal_wipe(journal, !really_read_only);
2253         if (!err)
2254                 err = journal_load(journal);
2255
2256         if (err) {
2257                 printk(KERN_ERR "EXT3-fs: error loading journal.\n");
2258                 journal_destroy(journal);
2259                 return err;
2260         }
2261
2262         EXT3_SB(sb)->s_journal = journal;
2263         ext3_clear_journal_err(sb, es);
2264
2265         if (journal_devnum &&
2266             journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2267                 es->s_journal_dev = cpu_to_le32(journal_devnum);
2268                 sb->s_dirt = 1;
2269
2270                 /* Make sure we flush the recovery flag to disk. */
2271                 ext3_commit_super(sb, es, 1);
2272         }
2273
2274         return 0;
2275 }
2276
2277 static int ext3_create_journal(struct super_block * sb,
2278                                struct ext3_super_block * es,
2279                                unsigned int journal_inum)
2280 {
2281         journal_t *journal;
2282         int err;
2283
2284         if (sb->s_flags & MS_RDONLY) {
2285                 printk(KERN_ERR "EXT3-fs: readonly filesystem when trying to "
2286                                 "create journal.\n");
2287                 return -EROFS;
2288         }
2289
2290         journal = ext3_get_journal(sb, journal_inum);
2291         if (!journal)
2292                 return -EINVAL;
2293
2294         printk(KERN_INFO "EXT3-fs: creating new journal on inode %u\n",
2295                journal_inum);
2296
2297         err = journal_create(journal);
2298         if (err) {
2299                 printk(KERN_ERR "EXT3-fs: error creating journal.\n");
2300                 journal_destroy(journal);
2301                 return -EIO;
2302         }
2303
2304         EXT3_SB(sb)->s_journal = journal;
2305
2306         ext3_update_dynamic_rev(sb);
2307         EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2308         EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2309
2310         es->s_journal_inum = cpu_to_le32(journal_inum);
2311         sb->s_dirt = 1;
2312
2313         /* Make sure we flush the recovery flag to disk. */
2314         ext3_commit_super(sb, es, 1);
2315
2316         return 0;
2317 }
2318
2319 static int ext3_commit_super(struct super_block *sb,
2320                                struct ext3_super_block *es,
2321                                int sync)
2322 {
2323         struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
2324         int error = 0;
2325
2326         if (!sbh)
2327                 return error;
2328         es->s_wtime = cpu_to_le32(get_seconds());
2329         es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2330         es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2331         BUFFER_TRACE(sbh, "marking dirty");
2332         mark_buffer_dirty(sbh);
2333         if (sync)
2334                 error = sync_dirty_buffer(sbh);
2335         return error;
2336 }
2337
2338
2339 /*
2340  * Have we just finished recovery?  If so, and if we are mounting (or
2341  * remounting) the filesystem readonly, then we will end up with a
2342  * consistent fs on disk.  Record that fact.
2343  */
2344 static void ext3_mark_recovery_complete(struct super_block * sb,
2345                                         struct ext3_super_block * es)
2346 {
2347         journal_t *journal = EXT3_SB(sb)->s_journal;
2348
2349         journal_lock_updates(journal);
2350         if (journal_flush(journal) < 0)
2351                 goto out;
2352
2353         lock_super(sb);
2354         if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2355             sb->s_flags & MS_RDONLY) {
2356                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2357                 sb->s_dirt = 0;
2358                 ext3_commit_super(sb, es, 1);
2359         }
2360         unlock_super(sb);
2361
2362 out:
2363         journal_unlock_updates(journal);
2364 }
2365
2366 /*
2367  * If we are mounting (or read-write remounting) a filesystem whose journal
2368  * has recorded an error from a previous lifetime, move that error to the
2369  * main filesystem now.
2370  */
2371 static void ext3_clear_journal_err(struct super_block * sb,
2372                                    struct ext3_super_block * es)
2373 {
2374         journal_t *journal;
2375         int j_errno;
2376         const char *errstr;
2377
2378         journal = EXT3_SB(sb)->s_journal;
2379
2380         /*
2381          * Now check for any error status which may have been recorded in the
2382          * journal by a prior ext3_error() or ext3_abort()
2383          */
2384
2385         j_errno = journal_errno(journal);
2386         if (j_errno) {
2387                 char nbuf[16];
2388
2389                 errstr = ext3_decode_error(sb, j_errno, nbuf);
2390                 ext3_warning(sb, __func__, "Filesystem error recorded "
2391                              "from previous mount: %s", errstr);
2392                 ext3_warning(sb, __func__, "Marking fs in need of "
2393                              "filesystem check.");
2394
2395                 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2396                 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2397                 ext3_commit_super (sb, es, 1);
2398
2399                 journal_clear_err(journal);
2400         }
2401 }
2402
2403 /*
2404  * Force the running and committing transactions to commit,
2405  * and wait on the commit.
2406  */
2407 int ext3_force_commit(struct super_block *sb)
2408 {
2409         journal_t *journal;
2410         int ret;
2411
2412         if (sb->s_flags & MS_RDONLY)
2413                 return 0;
2414
2415         journal = EXT3_SB(sb)->s_journal;
2416         sb->s_dirt = 0;
2417         ret = ext3_journal_force_commit(journal);
2418         return ret;
2419 }
2420
2421 /*
2422  * Ext3 always journals updates to the superblock itself, so we don't
2423  * have to propagate any other updates to the superblock on disk at this
2424  * point.  (We can probably nuke this function altogether, and remove
2425  * any mention to sb->s_dirt in all of fs/ext3; eventual cleanup...)
2426  */
2427 static void ext3_write_super (struct super_block * sb)
2428 {
2429         if (mutex_trylock(&sb->s_lock) != 0)
2430                 BUG();
2431         sb->s_dirt = 0;
2432 }
2433
2434 static int ext3_sync_fs(struct super_block *sb, int wait)
2435 {
2436         tid_t target;
2437
2438         sb->s_dirt = 0;
2439         if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2440                 if (wait)
2441                         log_wait_commit(EXT3_SB(sb)->s_journal, target);
2442         }
2443         return 0;
2444 }
2445
2446 /*
2447  * LVM calls this function before a (read-only) snapshot is created.  This
2448  * gives us a chance to flush the journal completely and mark the fs clean.
2449  */
2450 static int ext3_freeze(struct super_block *sb)
2451 {
2452         int error = 0;
2453         journal_t *journal;
2454         sb->s_dirt = 0;
2455
2456         if (!(sb->s_flags & MS_RDONLY)) {
2457                 journal = EXT3_SB(sb)->s_journal;
2458
2459                 /* Now we set up the journal barrier. */
2460                 journal_lock_updates(journal);
2461
2462                 /*
2463                  * We don't want to clear needs_recovery flag when we failed
2464                  * to flush the journal.
2465                  */
2466                 error = journal_flush(journal);
2467                 if (error < 0)
2468                         goto out;
2469
2470                 /* Journal blocked and flushed, clear needs_recovery flag. */
2471                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2472                 error = ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2473                 if (error)
2474                         goto out;
2475         }
2476         return 0;
2477
2478 out:
2479         journal_unlock_updates(journal);
2480         return error;
2481 }
2482
2483 /*
2484  * Called by LVM after the snapshot is done.  We need to reset the RECOVER
2485  * flag here, even though the filesystem is not technically dirty yet.
2486  */
2487 static int ext3_unfreeze(struct super_block *sb)
2488 {
2489         if (!(sb->s_flags & MS_RDONLY)) {
2490                 lock_super(sb);
2491                 /* Reser the needs_recovery flag before the fs is unlocked. */
2492                 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2493                 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2494                 unlock_super(sb);
2495                 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2496         }
2497         return 0;
2498 }
2499
2500 static int ext3_remount (struct super_block * sb, int * flags, char * data)
2501 {
2502         struct ext3_super_block * es;
2503         struct ext3_sb_info *sbi = EXT3_SB(sb);
2504         ext3_fsblk_t n_blocks_count = 0;
2505         unsigned long old_sb_flags;
2506         struct ext3_mount_options old_opts;
2507         int err;
2508 #ifdef CONFIG_QUOTA
2509         int i;
2510 #endif
2511
2512         /* Store the original options */
2513         old_sb_flags = sb->s_flags;
2514         old_opts.s_mount_opt = sbi->s_mount_opt;
2515         old_opts.s_resuid = sbi->s_resuid;
2516         old_opts.s_resgid = sbi->s_resgid;
2517         old_opts.s_commit_interval = sbi->s_commit_interval;
2518 #ifdef CONFIG_QUOTA
2519         old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2520         for (i = 0; i < MAXQUOTAS; i++)
2521                 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2522 #endif
2523
2524         /*
2525          * Allow the "check" option to be passed as a remount option.
2526          */
2527         if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2528                 err = -EINVAL;
2529                 goto restore_opts;
2530         }
2531
2532         if (sbi->s_mount_opt & EXT3_MOUNT_ABORT)
2533                 ext3_abort(sb, __func__, "Abort forced by user");
2534
2535         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2536                 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2537
2538         es = sbi->s_es;
2539
2540         ext3_init_journal_params(sb, sbi->s_journal);
2541
2542         if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2543                 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
2544                 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT) {
2545                         err = -EROFS;
2546                         goto restore_opts;
2547                 }
2548
2549                 if (*flags & MS_RDONLY) {
2550                         /*
2551                          * First of all, the unconditional stuff we have to do
2552                          * to disable replay of the journal when we next remount
2553                          */
2554                         sb->s_flags |= MS_RDONLY;
2555
2556                         /*
2557                          * OK, test if we are remounting a valid rw partition
2558                          * readonly, and if so set the rdonly flag and then
2559                          * mark the partition as valid again.
2560                          */
2561                         if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2562                             (sbi->s_mount_state & EXT3_VALID_FS))
2563                                 es->s_state = cpu_to_le16(sbi->s_mount_state);
2564
2565                         /*
2566                          * We have to unlock super so that we can wait for
2567                          * transactions.
2568                          */
2569                         unlock_super(sb);
2570                         ext3_mark_recovery_complete(sb, es);
2571                         lock_super(sb);
2572                 } else {
2573                         __le32 ret;
2574                         if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2575                                         ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2576                                 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2577                                        "remount RDWR because of unsupported "
2578                                        "optional features (%x).\n",
2579                                        sb->s_id, le32_to_cpu(ret));
2580                                 err = -EROFS;
2581                                 goto restore_opts;
2582                         }
2583
2584                         /*
2585                          * If we have an unprocessed orphan list hanging
2586                          * around from a previously readonly bdev mount,
2587                          * require a full umount/remount for now.
2588                          */
2589                         if (es->s_last_orphan) {
2590                                 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2591                                        "remount RDWR because of unprocessed "
2592                                        "orphan inode list.  Please "
2593                                        "umount/remount instead.\n",
2594                                        sb->s_id);
2595                                 err = -EINVAL;
2596                                 goto restore_opts;
2597                         }
2598
2599                         /*
2600                          * Mounting a RDONLY partition read-write, so reread
2601                          * and store the current valid flag.  (It may have
2602                          * been changed by e2fsck since we originally mounted
2603                          * the partition.)
2604                          */
2605                         ext3_clear_journal_err(sb, es);
2606                         sbi->s_mount_state = le16_to_cpu(es->s_state);
2607                         if ((err = ext3_group_extend(sb, es, n_blocks_count)))
2608                                 goto restore_opts;
2609                         if (!ext3_setup_super (sb, es, 0))
2610                                 sb->s_flags &= ~MS_RDONLY;
2611                 }
2612         }
2613 #ifdef CONFIG_QUOTA
2614         /* Release old quota file names */
2615         for (i = 0; i < MAXQUOTAS; i++)
2616                 if (old_opts.s_qf_names[i] &&
2617                     old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2618                         kfree(old_opts.s_qf_names[i]);
2619 #endif
2620         return 0;
2621 restore_opts:
2622         sb->s_flags = old_sb_flags;
2623         sbi->s_mount_opt = old_opts.s_mount_opt;
2624         sbi->s_resuid = old_opts.s_resuid;
2625         sbi->s_resgid = old_opts.s_resgid;
2626         sbi->s_commit_interval = old_opts.s_commit_interval;
2627 #ifdef CONFIG_QUOTA
2628         sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2629         for (i = 0; i < MAXQUOTAS; i++) {
2630                 if (sbi->s_qf_names[i] &&
2631                     old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2632                         kfree(sbi->s_qf_names[i]);
2633                 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2634         }
2635 #endif
2636         return err;
2637 }
2638
2639 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
2640 {
2641         struct super_block *sb = dentry->d_sb;
2642         struct ext3_sb_info *sbi = EXT3_SB(sb);
2643         struct ext3_super_block *es = sbi->s_es;
2644         u64 fsid;
2645
2646         if (test_opt(sb, MINIX_DF)) {
2647                 sbi->s_overhead_last = 0;
2648         } else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
2649                 unsigned long ngroups = sbi->s_groups_count, i;
2650                 ext3_fsblk_t overhead = 0;
2651                 smp_rmb();
2652
2653                 /*
2654                  * Compute the overhead (FS structures).  This is constant
2655                  * for a given filesystem unless the number of block groups
2656                  * changes so we cache the previous value until it does.
2657                  */
2658
2659                 /*
2660                  * All of the blocks before first_data_block are
2661                  * overhead
2662                  */
2663                 overhead = le32_to_cpu(es->s_first_data_block);
2664
2665                 /*
2666                  * Add the overhead attributed to the superblock and
2667                  * block group descriptors.  If the sparse superblocks
2668                  * feature is turned on, then not all groups have this.
2669                  */
2670                 for (i = 0; i < ngroups; i++) {
2671                         overhead += ext3_bg_has_super(sb, i) +
2672                                 ext3_bg_num_gdb(sb, i);
2673                         cond_resched();
2674                 }
2675
2676                 /*
2677                  * Every block group has an inode bitmap, a block
2678                  * bitmap, and an inode table.
2679                  */
2680                 overhead += ngroups * (2 + sbi->s_itb_per_group);
2681                 sbi->s_overhead_last = overhead;
2682                 smp_wmb();
2683                 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
2684         }
2685
2686         buf->f_type = EXT3_SUPER_MAGIC;
2687         buf->f_bsize = sb->s_blocksize;
2688         buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
2689         buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
2690         es->s_free_blocks_count = cpu_to_le32(buf->f_bfree);
2691         buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2692         if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2693                 buf->f_bavail = 0;
2694         buf->f_files = le32_to_cpu(es->s_inodes_count);
2695         buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
2696         es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
2697         buf->f_namelen = EXT3_NAME_LEN;
2698         fsid = le64_to_cpup((void *)es->s_uuid) ^
2699                le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2700         buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2701         buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
2702         return 0;
2703 }
2704
2705 /* Helper function for writing quotas on sync - we need to start transaction before quota file
2706  * is locked for write. Otherwise the are possible deadlocks:
2707  * Process 1                         Process 2
2708  * ext3_create()                     quota_sync()
2709  *   journal_start()                   write_dquot()
2710  *   vfs_dq_init()                       down(dqio_mutex)
2711  *     down(dqio_mutex)                    journal_start()
2712  *
2713  */
2714
2715 #ifdef CONFIG_QUOTA
2716
2717 static inline struct inode *dquot_to_inode(struct dquot *dquot)
2718 {
2719         return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2720 }
2721
2722 static int ext3_write_dquot(struct dquot *dquot)
2723 {
2724         int ret, err;
2725         handle_t *handle;
2726         struct inode *inode;
2727
2728         inode = dquot_to_inode(dquot);
2729         handle = ext3_journal_start(inode,
2730                                         EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2731         if (IS_ERR(handle))
2732                 return PTR_ERR(handle);
2733         ret = dquot_commit(dquot);
2734         err = ext3_journal_stop(handle);
2735         if (!ret)
2736                 ret = err;
2737         return ret;
2738 }
2739
2740 static int ext3_acquire_dquot(struct dquot *dquot)
2741 {
2742         int ret, err;
2743         handle_t *handle;
2744
2745         handle = ext3_journal_start(dquot_to_inode(dquot),
2746                                         EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2747         if (IS_ERR(handle))
2748                 return PTR_ERR(handle);
2749         ret = dquot_acquire(dquot);
2750         err = ext3_journal_stop(handle);
2751         if (!ret)
2752                 ret = err;
2753         return ret;
2754 }
2755
2756 static int ext3_release_dquot(struct dquot *dquot)
2757 {
2758         int ret, err;
2759         handle_t *handle;
2760
2761         handle = ext3_journal_start(dquot_to_inode(dquot),
2762                                         EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2763         if (IS_ERR(handle)) {
2764                 /* Release dquot anyway to avoid endless cycle in dqput() */
2765                 dquot_release(dquot);
2766                 return PTR_ERR(handle);
2767         }
2768         ret = dquot_release(dquot);
2769         err = ext3_journal_stop(handle);
2770         if (!ret)
2771                 ret = err;
2772         return ret;
2773 }
2774
2775 static int ext3_mark_dquot_dirty(struct dquot *dquot)
2776 {
2777         /* Are we journaling quotas? */
2778         if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2779             EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2780                 dquot_mark_dquot_dirty(dquot);
2781                 return ext3_write_dquot(dquot);
2782         } else {
2783                 return dquot_mark_dquot_dirty(dquot);
2784         }
2785 }
2786
2787 static int ext3_write_info(struct super_block *sb, int type)
2788 {
2789         int ret, err;
2790         handle_t *handle;
2791
2792         /* Data block + inode block */
2793         handle = ext3_journal_start(sb->s_root->d_inode, 2);
2794         if (IS_ERR(handle))
2795                 return PTR_ERR(handle);
2796         ret = dquot_commit_info(sb, type);
2797         err = ext3_journal_stop(handle);
2798         if (!ret)
2799                 ret = err;
2800         return ret;
2801 }
2802
2803 /*
2804  * Turn on quotas during mount time - we need to find
2805  * the quota file and such...
2806  */
2807 static int ext3_quota_on_mount(struct super_block *sb, int type)
2808 {
2809         return vfs_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2810                         EXT3_SB(sb)->s_jquota_fmt, type);
2811 }
2812
2813 /*
2814  * Standard function to be called on quota_on
2815  */
2816 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
2817                          char *name, int remount)
2818 {
2819         int err;
2820         struct path path;
2821
2822         if (!test_opt(sb, QUOTA))
2823                 return -EINVAL;
2824         /* When remounting, no checks are needed and in fact, name is NULL */
2825         if (remount)
2826                 return vfs_quota_on(sb, type, format_id, name, remount);
2827
2828         err = kern_path(name, LOOKUP_FOLLOW, &path);
2829         if (err)
2830                 return err;
2831
2832         /* Quotafile not on the same filesystem? */
2833         if (path.mnt->mnt_sb != sb) {
2834                 path_put(&path);
2835                 return -EXDEV;
2836         }
2837         /* Journaling quota? */
2838         if (EXT3_SB(sb)->s_qf_names[type]) {
2839                 /* Quotafile not of fs root? */
2840                 if (path.dentry->d_parent != sb->s_root)
2841                         printk(KERN_WARNING
2842                                 "EXT3-fs: Quota file not on filesystem root. "
2843                                 "Journaled quota will not work.\n");
2844         }
2845
2846         /*
2847          * When we journal data on quota file, we have to flush journal to see
2848          * all updates to the file when we bypass pagecache...
2849          */
2850         if (ext3_should_journal_data(path.dentry->d_inode)) {
2851                 /*
2852                  * We don't need to lock updates but journal_flush() could
2853                  * otherwise be livelocked...
2854                  */
2855                 journal_lock_updates(EXT3_SB(sb)->s_journal);
2856                 err = journal_flush(EXT3_SB(sb)->s_journal);
2857                 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2858                 if (err) {
2859                         path_put(&path);
2860                         return err;
2861                 }
2862         }
2863
2864         err = vfs_quota_on_path(sb, type, format_id, &path);
2865         path_put(&path);
2866         return err;
2867 }
2868
2869 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2870  * acquiring the locks... As quota files are never truncated and quota code
2871  * itself serializes the operations (and noone else should touch the files)
2872  * we don't have to be afraid of races */
2873 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2874                                size_t len, loff_t off)
2875 {
2876         struct inode *inode = sb_dqopt(sb)->files[type];
2877         sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2878         int err = 0;
2879         int offset = off & (sb->s_blocksize - 1);
2880         int tocopy;
2881         size_t toread;
2882         struct buffer_head *bh;
2883         loff_t i_size = i_size_read(inode);
2884
2885         if (off > i_size)
2886                 return 0;
2887         if (off+len > i_size)
2888                 len = i_size-off;
2889         toread = len;
2890         while (toread > 0) {
2891                 tocopy = sb->s_blocksize - offset < toread ?
2892                                 sb->s_blocksize - offset : toread;
2893                 bh = ext3_bread(NULL, inode, blk, 0, &err);
2894                 if (err)
2895                         return err;
2896                 if (!bh)        /* A hole? */
2897                         memset(data, 0, tocopy);
2898                 else
2899                         memcpy(data, bh->b_data+offset, tocopy);
2900                 brelse(bh);
2901                 offset = 0;
2902                 toread -= tocopy;
2903                 data += tocopy;
2904                 blk++;
2905         }
2906         return len;
2907 }
2908
2909 /* Write to quotafile (we know the transaction is already started and has
2910  * enough credits) */
2911 static ssize_t ext3_quota_write(struct super_block *sb, int type,
2912                                 const char *data, size_t len, loff_t off)
2913 {
2914         struct inode *inode = sb_dqopt(sb)->files[type];
2915         sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2916         int err = 0;
2917         int offset = off & (sb->s_blocksize - 1);
2918         int tocopy;
2919         int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
2920         size_t towrite = len;
2921         struct buffer_head *bh;
2922         handle_t *handle = journal_current_handle();
2923
2924         if (!handle) {
2925                 printk(KERN_WARNING "EXT3-fs: Quota write (off=%Lu, len=%Lu)"
2926                         " cancelled because transaction is not started.\n",
2927                         (unsigned long long)off, (unsigned long long)len);
2928                 return -EIO;
2929         }
2930         mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2931         while (towrite > 0) {
2932                 tocopy = sb->s_blocksize - offset < towrite ?
2933                                 sb->s_blocksize - offset : towrite;
2934                 bh = ext3_bread(handle, inode, blk, 1, &err);
2935                 if (!bh)
2936                         goto out;
2937                 if (journal_quota) {
2938                         err = ext3_journal_get_write_access(handle, bh);
2939                         if (err) {
2940                                 brelse(bh);
2941                                 goto out;
2942                         }
2943                 }
2944                 lock_buffer(bh);
2945                 memcpy(bh->b_data+offset, data, tocopy);
2946                 flush_dcache_page(bh->b_page);
2947                 unlock_buffer(bh);
2948                 if (journal_quota)
2949                         err = ext3_journal_dirty_metadata(handle, bh);
2950                 else {
2951                         /* Always do at least ordered writes for quotas */
2952                         err = ext3_journal_dirty_data(handle, bh);
2953                         mark_buffer_dirty(bh);
2954                 }
2955                 brelse(bh);
2956                 if (err)
2957                         goto out;
2958                 offset = 0;
2959                 towrite -= tocopy;
2960                 data += tocopy;
2961                 blk++;
2962         }
2963 out:
2964         if (len == towrite) {
2965                 mutex_unlock(&inode->i_mutex);
2966                 return err;
2967         }
2968         if (inode->i_size < off+len-towrite) {
2969                 i_size_write(inode, off+len-towrite);
2970                 EXT3_I(inode)->i_disksize = inode->i_size;
2971         }
2972         inode->i_version++;
2973         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2974         ext3_mark_inode_dirty(handle, inode);
2975         mutex_unlock(&inode->i_mutex);
2976         return len - towrite;
2977 }
2978
2979 #endif
2980
2981 static int ext3_get_sb(struct file_system_type *fs_type,
2982         int flags, const char *dev_name, void *data, struct vfsmount *mnt)
2983 {
2984         return get_sb_bdev(fs_type, flags, dev_name, data, ext3_fill_super, mnt);
2985 }
2986
2987 static struct file_system_type ext3_fs_type = {
2988         .owner          = THIS_MODULE,
2989         .name           = "ext3",
2990         .get_sb         = ext3_get_sb,
2991         .kill_sb        = kill_block_super,
2992         .fs_flags       = FS_REQUIRES_DEV,
2993 };
2994
2995 static int __init init_ext3_fs(void)
2996 {
2997         int err = init_ext3_xattr();
2998         if (err)
2999                 return err;
3000         err = init_inodecache();
3001         if (err)
3002                 goto out1;
3003         err = register_filesystem(&ext3_fs_type);
3004         if (err)
3005                 goto out;
3006         return 0;
3007 out:
3008         destroy_inodecache();
3009 out1:
3010         exit_ext3_xattr();
3011         return err;
3012 }
3013
3014 static void __exit exit_ext3_fs(void)
3015 {
3016         unregister_filesystem(&ext3_fs_type);
3017         destroy_inodecache();
3018         exit_ext3_xattr();
3019 }
3020
3021 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
3022 MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
3023 MODULE_LICENSE("GPL");
3024 module_init(init_ext3_fs)
3025 module_exit(exit_ext3_fs)