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/config.h>
  20 #include <linux/module.h>
  21 #include <linux/string.h>
  22 #include <linux/fs.h>
  23 #include <linux/time.h>
  24 #include <linux/jbd.h>
  25 #include <linux/ext3_fs.h>
  26 #include <linux/ext3_jbd.h>
  27 #include <linux/slab.h>
  28 #include <linux/init.h>
  29 #include <linux/blkdev.h>
  30 #include <linux/parser.h>
  31 #include <linux/smp_lock.h>
  32 #include <linux/buffer_head.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 <asm/uaccess.h>
  39 #include "xattr.h"
  40 #include "acl.h"
  41
  42 static int ext3_load_journal(struct super_block *, struct ext3_super_block *);
  43 static int ext3_create_journal(struct super_block *, struct ext3_super_block *,
  44                                int);
  45 static void ext3_commit_super (struct super_block * sb,
  46                                struct ext3_super_block * es,
  47                                int sync);
  48 static void ext3_mark_recovery_complete(struct super_block * sb,
  49                                         struct ext3_super_block * es);
  50 static void ext3_clear_journal_err(struct super_block * sb,
  51                                    struct ext3_super_block * es);
  52 static int ext3_sync_fs(struct super_block *sb, int wait);
  53 static const char *ext3_decode_error(struct super_block * sb, int errno,
  54                                      char nbuf[16]);
  55 static int ext3_remount (struct super_block * sb, int * flags, char * data);
  56 static int ext3_statfs (struct super_block * sb, struct kstatfs * buf);
  57 static void ext3_unlockfs(struct super_block *sb);
  58 static void ext3_write_super (struct super_block * sb);
  59 static void ext3_write_super_lockfs(struct super_block *sb);
  60
  61 /*
  62  * Wrappers for journal_start/end.
  63  *
  64  * The only special thing we need to do here is to make sure that all
  65  * journal_end calls result in the superblock being marked dirty, so
  66  * that sync() will call the filesystem's write_super callback if
  67  * appropriate.
  68  */
  69 handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks)
  70 {
  71         journal_t *journal;
  72
  73         if (sb->s_flags & MS_RDONLY)
  74                 return ERR_PTR(-EROFS);
  75
  76         /* Special case here: if the journal has aborted behind our
  77          * backs (eg. EIO in the commit thread), then we still need to
  78          * take the FS itself readonly cleanly. */
  79         journal = EXT3_SB(sb)->s_journal;
  80         if (is_journal_aborted(journal)) {
  81                 ext3_abort(sb, __FUNCTION__,
  82                            "Detected aborted journal");
  83                 return ERR_PTR(-EROFS);
  84         }
  85
  86         return journal_start(journal, nblocks);
  87 }
  88
  89 /*
  90  * The only special thing we need to do here is to make sure that all
  91  * journal_stop calls result in the superblock being marked dirty, so
  92  * that sync() will call the filesystem's write_super callback if
  93  * appropriate.
  94  */
  95 int __ext3_journal_stop(const char *where, handle_t *handle)
  96 {
  97         struct super_block *sb;
  98         int err;
  99         int rc;
 100
 101         sb = handle->h_transaction->t_journal->j_private;
 102         err = handle->h_err;
 103         rc = journal_stop(handle);
 104
 105         if (!err)
 106                 err = rc;
 107         if (err)
 108                 __ext3_std_error(sb, where, err);
 109         return err;
 110 }
 111
 112 void ext3_journal_abort_handle(const char *caller, const char *err_fn,
 113                 struct buffer_head *bh, handle_t *handle, int err)
 114 {
 115         char nbuf[16];
 116         const char *errstr = ext3_decode_error(NULL, err, nbuf);
 117
 118         if (bh)
 119                 BUFFER_TRACE(bh, "abort");
 120
 121         if (!handle->h_err)
 122                 handle->h_err = err;
 123
 124         if (is_handle_aborted(handle))
 125                 return;
 126
 127         printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
 128                caller, errstr, err_fn);
 129
 130         journal_abort_handle(handle);
 131 }
 132
 133 /* Deal with the reporting of failure conditions on a filesystem such as
 134  * inconsistencies detected or read IO failures.
 135  *
 136  * On ext2, we can store the error state of the filesystem in the
 137  * superblock.  That is not possible on ext3, because we may have other
 138  * write ordering constraints on the superblock which prevent us from
 139  * writing it out straight away; and given that the journal is about to
 140  * be aborted, we can't rely on the current, or future, transactions to
 141  * write out the superblock safely.
 142  *
 143  * We'll just use the journal_abort() error code to record an error in
 144  * the journal instead.  On recovery, the journal will compain about
 145  * that error until we've noted it down and cleared it.
 146  */
 147
 148 static void ext3_handle_error(struct super_block *sb)
 149 {
 150         struct ext3_super_block *es = EXT3_SB(sb)->s_es;
 151
 152         EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
 153         es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
 154
 155         if (sb->s_flags & MS_RDONLY)
 156                 return;
 157
 158         if (test_opt (sb, ERRORS_RO)) {
 159                 printk (KERN_CRIT "Remounting filesystem read-only\n");
 160                 sb->s_flags |= MS_RDONLY;
 161         } else {
 162                 journal_t *journal = EXT3_SB(sb)->s_journal;
 163
 164                 EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
 165                 if (journal)
 166                         journal_abort(journal, -EIO);
 167         }
 168         if (test_opt(sb, ERRORS_PANIC))
 169                 panic("EXT3-fs (device %s): panic forced after error\n",
 170                         sb->s_id);
 171         ext3_commit_super(sb, es, 1);
 172 }
 173
 174 void ext3_error (struct super_block * sb, const char * function,
 175                  const char * fmt, ...)
 176 {
 177         va_list args;
 178
 179         va_start(args, fmt);
 180         printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
 181         vprintk(fmt, args);
 182         printk("\n");
 183         va_end(args);
 184
 185         ext3_handle_error(sb);
 186 }
 187
 188 static const char *ext3_decode_error(struct super_block * sb, int errno,
 189                                      char nbuf[16])
 190 {
 191         char *errstr = NULL;
 192
 193         switch (errno) {
 194         case -EIO:
 195                 errstr = "IO failure";
 196                 break;
 197         case -ENOMEM:
 198                 errstr = "Out of memory";
 199                 break;
 200         case -EROFS:
 201                 if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT)
 202                         errstr = "Journal has aborted";
 203                 else
 204                         errstr = "Readonly filesystem";
 205                 break;
 206         default:
 207                 /* If the caller passed in an extra buffer for unknown
 208                  * errors, textualise them now.  Else we just return
 209                  * NULL. */
 210                 if (nbuf) {
 211                         /* Check for truncated error codes... */
 212                         if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
 213                                 errstr = nbuf;
 214                 }
 215                 break;
 216         }
 217
 218         return errstr;
 219 }
 220
 221 /* __ext3_std_error decodes expected errors from journaling functions
 222  * automatically and invokes the appropriate error response.  */
 223
 224 void __ext3_std_error (struct super_block * sb, const char * function,
 225                        int errno)
 226 {
 227         char nbuf[16];
 228         const char *errstr;
 229
 230         /* Special case: if the error is EROFS, and we're not already
 231          * inside a transaction, then there's really no point in logging
 232          * an error. */
 233         if (errno == -EROFS && journal_current_handle() == NULL &&
 234             (sb->s_flags & MS_RDONLY))
 235                 return;
 236
 237         errstr = ext3_decode_error(sb, errno, nbuf);
 238         printk (KERN_CRIT "EXT3-fs error (device %s) in %s: %s\n",
 239                 sb->s_id, function, errstr);
 240
 241         ext3_handle_error(sb);
 242 }
 243
 244 /*
 245  * ext3_abort is a much stronger failure handler than ext3_error.  The
 246  * abort function may be used to deal with unrecoverable failures such
 247  * as journal IO errors or ENOMEM at a critical moment in log management.
 248  *
 249  * We unconditionally force the filesystem into an ABORT|READONLY state,
 250  * unless the error response on the fs has been set to panic in which
 251  * case we take the easy way out and panic immediately.
 252  */
 253
 254 void ext3_abort (struct super_block * sb, const char * function,
 255                  const char * fmt, ...)
 256 {
 257         va_list args;
 258
 259         printk (KERN_CRIT "ext3_abort called.\n");
 260
 261         va_start(args, fmt);
 262         printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
 263         vprintk(fmt, args);
 264         printk("\n");
 265         va_end(args);
 266
 267         if (test_opt(sb, ERRORS_PANIC))
 268                 panic("EXT3-fs panic from previous error\n");
 269
 270         if (sb->s_flags & MS_RDONLY)
 271                 return;
 272
 273         printk(KERN_CRIT "Remounting filesystem read-only\n");
 274         EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
 275         sb->s_flags |= MS_RDONLY;
 276         EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
 277         journal_abort(EXT3_SB(sb)->s_journal, -EIO);
 278 }
 279
 280 void ext3_warning (struct super_block * sb, const char * function,
 281                    const char * fmt, ...)
 282 {
 283         va_list args;
 284
 285         va_start(args, fmt);
 286         printk(KERN_WARNING "EXT3-fs warning (device %s): %s: ",
 287                sb->s_id, function);
 288         vprintk(fmt, args);
 289         printk("\n");
 290         va_end(args);
 291 }
 292
 293 void ext3_update_dynamic_rev(struct super_block *sb)
 294 {
 295         struct ext3_super_block *es = EXT3_SB(sb)->s_es;
 296
 297         if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
 298                 return;
 299
 300         ext3_warning(sb, __FUNCTION__,
 301                      "updating to rev %d because of new feature flag, "
 302                      "running e2fsck is recommended",
 303                      EXT3_DYNAMIC_REV);
 304
 305         es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO);
 306         es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE);
 307         es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV);
 308         /* leave es->s_feature_*compat flags alone */
 309         /* es->s_uuid will be set by e2fsck if empty */
 310
 311         /*
 312          * The rest of the superblock fields should be zero, and if not it
 313          * means they are likely already in use, so leave them alone.  We
 314          * can leave it up to e2fsck to clean up any inconsistencies there.
 315          */
 316 }
 317
 318 /*
 319  * Open the external journal device
 320  */
 321 static struct block_device *ext3_blkdev_get(dev_t dev)
 322 {
 323         struct block_device *bdev;
 324         char b[BDEVNAME_SIZE];
 325
 326         bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
 327         if (IS_ERR(bdev))
 328                 goto fail;
 329         return bdev;
 330
 331 fail:
 332         printk(KERN_ERR "EXT3: failed to open journal device %s: %ld\n",
 333                         __bdevname(dev, b), PTR_ERR(bdev));
 334         return NULL;
 335 }
 336
 337 /*
 338  * Release the journal device
 339  */
 340 static int ext3_blkdev_put(struct block_device *bdev)
 341 {
 342         bd_release(bdev);
 343         return blkdev_put(bdev);
 344 }
 345
 346 static int ext3_blkdev_remove(struct ext3_sb_info *sbi)
 347 {
 348         struct block_device *bdev;
 349         int ret = -ENODEV;
 350
 351         bdev = sbi->journal_bdev;
 352         if (bdev) {
 353                 ret = ext3_blkdev_put(bdev);
 354                 sbi->journal_bdev = NULL;
 355         }
 356         return ret;
 357 }
 358
 359 static inline struct inode *orphan_list_entry(struct list_head *l)
 360 {
 361         return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
 362 }
 363
 364 static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
 365 {
 366         struct list_head *l;
 367
 368         printk(KERN_ERR "sb orphan head is %d\n",
 369                le32_to_cpu(sbi->s_es->s_last_orphan));
 370
 371         printk(KERN_ERR "sb_info orphan list:\n");
 372         list_for_each(l, &sbi->s_orphan) {
 373                 struct inode *inode = orphan_list_entry(l);
 374                 printk(KERN_ERR "  "
 375                        "inode %s:%ld at %p: mode %o, nlink %d, next %d\n",
 376                        inode->i_sb->s_id, inode->i_ino, inode,
 377                        inode->i_mode, inode->i_nlink,
 378                        NEXT_ORPHAN(inode));
 379         }
 380 }
 381
 382 static void ext3_put_super (struct super_block * sb)
 383 {
 384         struct ext3_sb_info *sbi = EXT3_SB(sb);
 385         struct ext3_super_block *es = sbi->s_es;
 386         int i;
 387
 388         ext3_xattr_put_super(sb);
 389         journal_destroy(sbi->s_journal);
 390         if (!(sb->s_flags & MS_RDONLY)) {
 391                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
 392                 es->s_state = cpu_to_le16(sbi->s_mount_state);
 393                 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
 394                 mark_buffer_dirty(sbi->s_sbh);
 395                 ext3_commit_super(sb, es, 1);
 396         }
 397
 398         for (i = 0; i < sbi->s_gdb_count; i++)
 399                 brelse(sbi->s_group_desc[i]);
 400         kfree(sbi->s_group_desc);
 401         percpu_counter_destroy(&sbi->s_freeblocks_counter);
 402         percpu_counter_destroy(&sbi->s_freeinodes_counter);
 403         percpu_counter_destroy(&sbi->s_dirs_counter);
 404         brelse(sbi->s_sbh);
 405 #ifdef CONFIG_QUOTA
 406         for (i = 0; i < MAXQUOTAS; i++)
 407                 kfree(sbi->s_qf_names[i]);
 408 #endif
 409
 410         /* Debugging code just in case the in-memory inode orphan list
 411          * isn't empty.  The on-disk one can be non-empty if we've
 412          * detected an error and taken the fs readonly, but the
 413          * in-memory list had better be clean by this point. */
 414         if (!list_empty(&sbi->s_orphan))
 415                 dump_orphan_list(sb, sbi);
 416         J_ASSERT(list_empty(&sbi->s_orphan));
 417
 418         invalidate_bdev(sb->s_bdev, 0);
 419         if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
 420                 /*
 421                  * Invalidate the journal device's buffers.  We don't want them
 422                  * floating about in memory - the physical journal device may
 423                  * hotswapped, and it breaks the `ro-after' testing code.
 424                  */
 425                 sync_blockdev(sbi->journal_bdev);
 426                 invalidate_bdev(sbi->journal_bdev, 0);
 427                 ext3_blkdev_remove(sbi);
 428         }
 429         sb->s_fs_info = NULL;
 430         kfree(sbi);
 431         return;
 432 }
 433
 434 static kmem_cache_t *ext3_inode_cachep;
 435
 436 /*
 437  * Called inside transaction, so use GFP_NOFS
 438  */
 439 static struct inode *ext3_alloc_inode(struct super_block *sb)
 440 {
 441         struct ext3_inode_info *ei;
 442
 443         ei = kmem_cache_alloc(ext3_inode_cachep, SLAB_NOFS);
 444         if (!ei)
 445                 return NULL;
 446 #ifdef CONFIG_EXT3_FS_POSIX_ACL
 447         ei->i_acl = EXT3_ACL_NOT_CACHED;
 448         ei->i_default_acl = EXT3_ACL_NOT_CACHED;
 449 #endif
 450         ei->i_block_alloc_info = NULL;
 451         ei->vfs_inode.i_version = 1;
 452         return &ei->vfs_inode;
 453 }
 454
 455 static void ext3_destroy_inode(struct inode *inode)
 456 {
 457         kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
 458 }
 459
 460 static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
 461 {
 462         struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
 463
 464         if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
 465             SLAB_CTOR_CONSTRUCTOR) {
 466                 INIT_LIST_HEAD(&ei->i_orphan);
 467 #ifdef CONFIG_EXT3_FS_XATTR
 468                 init_rwsem(&ei->xattr_sem);
 469 #endif
 470                 init_MUTEX(&ei->truncate_sem);
 471                 inode_init_once(&ei->vfs_inode);
 472         }
 473 }
 474
 475 static int init_inodecache(void)
 476 {
 477         ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
 478                                              sizeof(struct ext3_inode_info),
 479                                              0, SLAB_RECLAIM_ACCOUNT,
 480                                              init_once, NULL);
 481         if (ext3_inode_cachep == NULL)
 482                 return -ENOMEM;
 483         return 0;
 484 }
 485
 486 static void destroy_inodecache(void)
 487 {
 488         if (kmem_cache_destroy(ext3_inode_cachep))
 489                 printk(KERN_INFO "ext3_inode_cache: not all structures were freed\n");
 490 }
 491
 492 static void ext3_clear_inode(struct inode *inode)
 493 {
 494         struct ext3_block_alloc_info *rsv = EXT3_I(inode)->i_block_alloc_info;
 495 #ifdef CONFIG_EXT3_FS_POSIX_ACL
 496        if (EXT3_I(inode)->i_acl &&
 497            EXT3_I(inode)->i_acl != EXT3_ACL_NOT_CACHED) {
 498                posix_acl_release(EXT3_I(inode)->i_acl);
 499                EXT3_I(inode)->i_acl = EXT3_ACL_NOT_CACHED;
 500        }
 501        if (EXT3_I(inode)->i_default_acl &&
 502            EXT3_I(inode)->i_default_acl != EXT3_ACL_NOT_CACHED) {
 503                posix_acl_release(EXT3_I(inode)->i_default_acl);
 504                EXT3_I(inode)->i_default_acl = EXT3_ACL_NOT_CACHED;
 505        }
 506 #endif
 507         ext3_discard_reservation(inode);
 508         EXT3_I(inode)->i_block_alloc_info = NULL;
 509         kfree(rsv);
 510 }
 511
 512 #ifdef CONFIG_QUOTA
 513
 514 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
 515 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
 516
 517 static int ext3_dquot_initialize(struct inode *inode, int type);
 518 static int ext3_dquot_drop(struct inode *inode);
 519 static int ext3_write_dquot(struct dquot *dquot);
 520 static int ext3_acquire_dquot(struct dquot *dquot);
 521 static int ext3_release_dquot(struct dquot *dquot);
 522 static int ext3_mark_dquot_dirty(struct dquot *dquot);
 523 static int ext3_write_info(struct super_block *sb, int type);
 524 static int ext3_quota_on(struct super_block *sb, int type, int format_id, char *path);
 525 static int ext3_quota_on_mount(struct super_block *sb, int type);
 526 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
 527                                size_t len, loff_t off);
 528 static ssize_t ext3_quota_write(struct super_block *sb, int type,
 529                                 const char *data, size_t len, loff_t off);
 530
 531 static struct dquot_operations ext3_quota_operations = {
 532         .initialize     = ext3_dquot_initialize,
 533         .drop           = ext3_dquot_drop,
 534         .alloc_space    = dquot_alloc_space,
 535         .alloc_inode    = dquot_alloc_inode,
 536         .free_space     = dquot_free_space,
 537         .free_inode     = dquot_free_inode,
 538         .transfer       = dquot_transfer,
 539         .write_dquot    = ext3_write_dquot,
 540         .acquire_dquot  = ext3_acquire_dquot,
 541         .release_dquot  = ext3_release_dquot,
 542         .mark_dirty     = ext3_mark_dquot_dirty,
 543         .write_info     = ext3_write_info
 544 };
 545
 546 static struct quotactl_ops ext3_qctl_operations = {
 547         .quota_on       = ext3_quota_on,
 548         .quota_off      = vfs_quota_off,
 549         .quota_sync     = vfs_quota_sync,
 550         .get_info       = vfs_get_dqinfo,
 551         .set_info       = vfs_set_dqinfo,
 552         .get_dqblk      = vfs_get_dqblk,
 553         .set_dqblk      = vfs_set_dqblk
 554 };
 555 #endif
 556
 557 static struct super_operations ext3_sops = {
 558         .alloc_inode    = ext3_alloc_inode,
 559         .destroy_inode  = ext3_destroy_inode,
 560         .read_inode     = ext3_read_inode,
 561         .write_inode    = ext3_write_inode,
 562         .dirty_inode    = ext3_dirty_inode,
 563         .delete_inode   = ext3_delete_inode,
 564         .put_super      = ext3_put_super,
 565         .write_super    = ext3_write_super,
 566         .sync_fs        = ext3_sync_fs,
 567         .write_super_lockfs = ext3_write_super_lockfs,
 568         .unlockfs       = ext3_unlockfs,
 569         .statfs         = ext3_statfs,
 570         .remount_fs     = ext3_remount,
 571         .clear_inode    = ext3_clear_inode,
 572 #ifdef CONFIG_QUOTA
 573         .quota_read     = ext3_quota_read,
 574         .quota_write    = ext3_quota_write,
 575 #endif
 576 };
 577
 578 struct dentry *ext3_get_parent(struct dentry *child);
 579 static struct export_operations ext3_export_ops = {
 580         .get_parent = ext3_get_parent,
 581 };
 582
 583 enum {
 584         Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
 585         Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
 586         Opt_nouid32, Opt_check, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
 587         Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
 588         Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh,
 589         Opt_commit, Opt_journal_update, Opt_journal_inum,
 590         Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
 591         Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
 592         Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0,
 593         Opt_ignore, Opt_barrier, Opt_err, Opt_resize,
 594 };
 595
 596 static match_table_t tokens = {
 597         {Opt_bsd_df, "bsddf"},
 598         {Opt_minix_df, "minixdf"},
 599         {Opt_grpid, "grpid"},
 600         {Opt_grpid, "bsdgroups"},
 601         {Opt_nogrpid, "nogrpid"},
 602         {Opt_nogrpid, "sysvgroups"},
 603         {Opt_resgid, "resgid=%u"},
 604         {Opt_resuid, "resuid=%u"},
 605         {Opt_sb, "sb=%u"},
 606         {Opt_err_cont, "errors=continue"},
 607         {Opt_err_panic, "errors=panic"},
 608         {Opt_err_ro, "errors=remount-ro"},
 609         {Opt_nouid32, "nouid32"},
 610         {Opt_nocheck, "nocheck"},
 611         {Opt_nocheck, "check=none"},
 612         {Opt_check, "check"},
 613         {Opt_debug, "debug"},
 614         {Opt_oldalloc, "oldalloc"},
 615         {Opt_orlov, "orlov"},
 616         {Opt_user_xattr, "user_xattr"},
 617         {Opt_nouser_xattr, "nouser_xattr"},
 618         {Opt_acl, "acl"},
 619         {Opt_noacl, "noacl"},
 620         {Opt_reservation, "reservation"},
 621         {Opt_noreservation, "noreservation"},
 622         {Opt_noload, "noload"},
 623         {Opt_nobh, "nobh"},
 624         {Opt_commit, "commit=%u"},
 625         {Opt_journal_update, "journal=update"},
 626         {Opt_journal_inum, "journal=%u"},
 627         {Opt_abort, "abort"},
 628         {Opt_data_journal, "data=journal"},
 629         {Opt_data_ordered, "data=ordered"},
 630         {Opt_data_writeback, "data=writeback"},
 631         {Opt_offusrjquota, "usrjquota="},
 632         {Opt_usrjquota, "usrjquota=%s"},
 633         {Opt_offgrpjquota, "grpjquota="},
 634         {Opt_grpjquota, "grpjquota=%s"},
 635         {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
 636         {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
 637         {Opt_ignore, "grpquota"},
 638         {Opt_ignore, "noquota"},
 639         {Opt_ignore, "quota"},
 640         {Opt_ignore, "usrquota"},
 641         {Opt_barrier, "barrier=%u"},
 642         {Opt_err, NULL},
 643         {Opt_resize, "resize"},
 644 };
 645
 646 static unsigned long get_sb_block(void **data)
 647 {
 648         unsigned long   sb_block;
 649         char            *options = (char *) *data;
 650
 651         if (!options || strncmp(options, "sb=", 3) != 0)
 652                 return 1;       /* Default location */
 653         options += 3;
 654         sb_block = simple_strtoul(options, &options, 0);
 655         if (*options && *options != ',') {
 656                 printk("EXT3-fs: Invalid sb specification: %s\n",
 657                        (char *) *data);
 658                 return 1;
 659         }
 660         if (*options == ',')
 661                 options++;
 662         *data = (void *) options;
 663         return sb_block;
 664 }
 665
 666 static int parse_options (char * options, struct super_block *sb,
 667                           unsigned long * inum, unsigned long *n_blocks_count, int is_remount)
 668 {
 669         struct ext3_sb_info *sbi = EXT3_SB(sb);
 670         char * p;
 671         substring_t args[MAX_OPT_ARGS];
 672         int data_opt = 0;
 673         int option;
 674 #ifdef CONFIG_QUOTA
 675         int qtype;
 676         char *qname;
 677 #endif
 678
 679         if (!options)
 680                 return 1;
 681
 682         while ((p = strsep (&options, ",")) != NULL) {
 683                 int token;
 684                 if (!*p)
 685                         continue;
 686
 687                 token = match_token(p, tokens, args);
 688                 switch (token) {
 689                 case Opt_bsd_df:
 690                         clear_opt (sbi->s_mount_opt, MINIX_DF);
 691                         break;
 692                 case Opt_minix_df:
 693                         set_opt (sbi->s_mount_opt, MINIX_DF);
 694                         break;
 695                 case Opt_grpid:
 696                         set_opt (sbi->s_mount_opt, GRPID);
 697                         break;
 698                 case Opt_nogrpid:
 699                         clear_opt (sbi->s_mount_opt, GRPID);
 700                         break;
 701                 case Opt_resuid:
 702                         if (match_int(&args[0], &option))
 703                                 return 0;
 704                         sbi->s_resuid = option;
 705                         break;
 706                 case Opt_resgid:
 707                         if (match_int(&args[0], &option))
 708                                 return 0;
 709                         sbi->s_resgid = option;
 710                         break;
 711                 case Opt_sb:
 712                         /* handled by get_sb_block() instead of here */
 713                         /* *sb_block = match_int(&args[0]); */
 714                         break;
 715                 case Opt_err_panic:
 716                         clear_opt (sbi->s_mount_opt, ERRORS_CONT);
 717                         clear_opt (sbi->s_mount_opt, ERRORS_RO);
 718                         set_opt (sbi->s_mount_opt, ERRORS_PANIC);
 719                         break;
 720                 case Opt_err_ro:
 721                         clear_opt (sbi->s_mount_opt, ERRORS_CONT);
 722                         clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
 723                         set_opt (sbi->s_mount_opt, ERRORS_RO);
 724                         break;
 725                 case Opt_err_cont:
 726                         clear_opt (sbi->s_mount_opt, ERRORS_RO);
 727                         clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
 728                         set_opt (sbi->s_mount_opt, ERRORS_CONT);
 729                         break;
 730                 case Opt_nouid32:
 731                         set_opt (sbi->s_mount_opt, NO_UID32);
 732                         break;
 733                 case Opt_check:
 734 #ifdef CONFIG_EXT3_CHECK
 735                         set_opt (sbi->s_mount_opt, CHECK);
 736 #else
 737                         printk(KERN_ERR
 738                                "EXT3 Check option not supported\n");
 739 #endif
 740                         break;
 741                 case Opt_nocheck:
 742                         clear_opt (sbi->s_mount_opt, CHECK);
 743                         break;
 744                 case Opt_debug:
 745                         set_opt (sbi->s_mount_opt, DEBUG);
 746                         break;
 747                 case Opt_oldalloc:
 748                         set_opt (sbi->s_mount_opt, OLDALLOC);
 749                         break;
 750                 case Opt_orlov:
 751                         clear_opt (sbi->s_mount_opt, OLDALLOC);
 752                         break;
 753 #ifdef CONFIG_EXT3_FS_XATTR
 754                 case Opt_user_xattr:
 755                         set_opt (sbi->s_mount_opt, XATTR_USER);
 756                         break;
 757                 case Opt_nouser_xattr:
 758                         clear_opt (sbi->s_mount_opt, XATTR_USER);
 759                         break;
 760 #else
 761                 case Opt_user_xattr:
 762                 case Opt_nouser_xattr:
 763                         printk("EXT3 (no)user_xattr options not supported\n");
 764                         break;
 765 #endif
 766 #ifdef CONFIG_EXT3_FS_POSIX_ACL
 767                 case Opt_acl:
 768                         set_opt(sbi->s_mount_opt, POSIX_ACL);
 769                         break;
 770                 case Opt_noacl:
 771                         clear_opt(sbi->s_mount_opt, POSIX_ACL);
 772                         break;
 773 #else
 774                 case Opt_acl:
 775                 case Opt_noacl:
 776                         printk("EXT3 (no)acl options not supported\n");
 777                         break;
 778 #endif
 779                 case Opt_reservation:
 780                         set_opt(sbi->s_mount_opt, RESERVATION);
 781                         break;
 782                 case Opt_noreservation:
 783                         clear_opt(sbi->s_mount_opt, RESERVATION);
 784                         break;
 785                 case Opt_journal_update:
 786                         /* @@@ FIXME */
 787                         /* Eventually we will want to be able to create
 788                            a journal file here.  For now, only allow the
 789                            user to specify an existing inode to be the
 790                            journal file. */
 791                         if (is_remount) {
 792                                 printk(KERN_ERR "EXT3-fs: cannot specify "
 793                                        "journal on remount\n");
 794                                 return 0;
 795                         }
 796                         set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
 797                         break;
 798                 case Opt_journal_inum:
 799                         if (is_remount) {
 800                                 printk(KERN_ERR "EXT3-fs: cannot specify "
 801                                        "journal on remount\n");
 802                                 return 0;
 803                         }
 804                         if (match_int(&args[0], &option))
 805                                 return 0;
 806                         *inum = option;
 807                         break;
 808                 case Opt_noload:
 809                         set_opt (sbi->s_mount_opt, NOLOAD);
 810                         break;
 811                 case Opt_commit:
 812                         if (match_int(&args[0], &option))
 813                                 return 0;
 814                         if (option < 0)
 815                                 return 0;
 816                         if (option == 0)
 817                                 option = JBD_DEFAULT_MAX_COMMIT_AGE;
 818                         sbi->s_commit_interval = HZ * option;
 819                         break;
 820                 case Opt_data_journal:
 821                         data_opt = EXT3_MOUNT_JOURNAL_DATA;
 822                         goto datacheck;
 823                 case Opt_data_ordered:
 824                         data_opt = EXT3_MOUNT_ORDERED_DATA;
 825                         goto datacheck;
 826                 case Opt_data_writeback:
 827                         data_opt = EXT3_MOUNT_WRITEBACK_DATA;
 828                 datacheck:
 829                         if (is_remount) {
 830                                 if ((sbi->s_mount_opt & EXT3_MOUNT_DATA_FLAGS)
 831                                                 != data_opt) {
 832                                         printk(KERN_ERR
 833                                                 "EXT3-fs: cannot change data "
 834                                                 "mode on remount\n");
 835                                         return 0;
 836                                 }
 837                         } else {
 838                                 sbi->s_mount_opt &= ~EXT3_MOUNT_DATA_FLAGS;
 839                                 sbi->s_mount_opt |= data_opt;
 840                         }
 841                         break;
 842 #ifdef CONFIG_QUOTA
 843                 case Opt_usrjquota:
 844                         qtype = USRQUOTA;
 845                         goto set_qf_name;
 846                 case Opt_grpjquota:
 847                         qtype = GRPQUOTA;
 848 set_qf_name:
 849                         if (sb_any_quota_enabled(sb)) {
 850                                 printk(KERN_ERR
 851                                         "EXT3-fs: Cannot change journalled "
 852                                         "quota options when quota turned on.\n");
 853                                 return 0;
 854                         }
 855                         qname = match_strdup(&args[0]);
 856                         if (!qname) {
 857                                 printk(KERN_ERR
 858                                         "EXT3-fs: not enough memory for "
 859                                         "storing quotafile name.\n");
 860                                 return 0;
 861                         }
 862                         if (sbi->s_qf_names[qtype] &&
 863                             strcmp(sbi->s_qf_names[qtype], qname)) {
 864                                 printk(KERN_ERR
 865                                         "EXT3-fs: %s quota file already "
 866                                         "specified.\n", QTYPE2NAME(qtype));
 867                                 kfree(qname);
 868                                 return 0;
 869                         }
 870                         sbi->s_qf_names[qtype] = qname;
 871                         if (strchr(sbi->s_qf_names[qtype], '/')) {
 872                                 printk(KERN_ERR
 873                                         "EXT3-fs: quotafile must be on "
 874                                         "filesystem root.\n");
 875                                 kfree(sbi->s_qf_names[qtype]);
 876                                 sbi->s_qf_names[qtype] = NULL;
 877                                 return 0;
 878                         }
 879                         break;
 880                 case Opt_offusrjquota:
 881                         qtype = USRQUOTA;
 882                         goto clear_qf_name;
 883                 case Opt_offgrpjquota:
 884                         qtype = GRPQUOTA;
 885 clear_qf_name:
 886                         if (sb_any_quota_enabled(sb)) {
 887                                 printk(KERN_ERR "EXT3-fs: Cannot change "
 888                                         "journalled quota options when "
 889                                         "quota turned on.\n");
 890                                 return 0;
 891                         }
 892                         kfree(sbi->s_qf_names[qtype]);
 893                         sbi->s_qf_names[qtype] = NULL;
 894                         break;
 895                 case Opt_jqfmt_vfsold:
 896                         sbi->s_jquota_fmt = QFMT_VFS_OLD;
 897                         break;
 898                 case Opt_jqfmt_vfsv0:
 899                         sbi->s_jquota_fmt = QFMT_VFS_V0;
 900                         break;
 901 #else
 902                 case Opt_usrjquota:
 903                 case Opt_grpjquota:
 904                 case Opt_offusrjquota:
 905                 case Opt_offgrpjquota:
 906                 case Opt_jqfmt_vfsold:
 907                 case Opt_jqfmt_vfsv0:
 908                         printk(KERN_ERR
 909                                 "EXT3-fs: journalled quota options not "
 910                                 "supported.\n");
 911                         break;
 912 #endif
 913                 case Opt_abort:
 914                         set_opt(sbi->s_mount_opt, ABORT);
 915                         break;
 916                 case Opt_barrier:
 917                         if (match_int(&args[0], &option))
 918                                 return 0;
 919                         if (option)
 920                                 set_opt(sbi->s_mount_opt, BARRIER);
 921                         else
 922                                 clear_opt(sbi->s_mount_opt, BARRIER);
 923                         break;
 924                 case Opt_ignore:
 925                         break;
 926                 case Opt_resize:
 927                         if (!n_blocks_count) {
 928                                 printk("EXT3-fs: resize option only available "
 929                                         "for remount\n");
 930                                 return 0;
 931                         }
 932                         match_int(&args[0], &option);
 933                         *n_blocks_count = option;
 934                         break;
 935                 case Opt_nobh:
 936                         set_opt(sbi->s_mount_opt, NOBH);
 937                         break;
 938                 default:
 939                         printk (KERN_ERR
 940                                 "EXT3-fs: Unrecognized mount option \"%s\" "
 941                                 "or missing value\n", p);
 942                         return 0;
 943                 }
 944         }
 945 #ifdef CONFIG_QUOTA
 946         if (!sbi->s_jquota_fmt && (sbi->s_qf_names[USRQUOTA] ||
 947             sbi->s_qf_names[GRPQUOTA])) {
 948                 printk(KERN_ERR
 949                         "EXT3-fs: journalled quota format not specified.\n");
 950                 return 0;
 951         }
 952 #endif
 953
 954         return 1;
 955 }
 956
 957 static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
 958                             int read_only)
 959 {
 960         struct ext3_sb_info *sbi = EXT3_SB(sb);
 961         int res = 0;
 962
 963         if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
 964                 printk (KERN_ERR "EXT3-fs warning: revision level too high, "
 965                         "forcing read-only mode\n");
 966                 res = MS_RDONLY;
 967         }
 968         if (read_only)
 969                 return res;
 970         if (!(sbi->s_mount_state & EXT3_VALID_FS))
 971                 printk (KERN_WARNING "EXT3-fs warning: mounting unchecked fs, "
 972                         "running e2fsck is recommended\n");
 973         else if ((sbi->s_mount_state & EXT3_ERROR_FS))
 974                 printk (KERN_WARNING
 975                         "EXT3-fs warning: mounting fs with errors, "
 976                         "running e2fsck is recommended\n");
 977         else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
 978                  le16_to_cpu(es->s_mnt_count) >=
 979                  (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
 980                 printk (KERN_WARNING
 981                         "EXT3-fs warning: maximal mount count reached, "
 982                         "running e2fsck is recommended\n");
 983         else if (le32_to_cpu(es->s_checkinterval) &&
 984                 (le32_to_cpu(es->s_lastcheck) +
 985                         le32_to_cpu(es->s_checkinterval) <= get_seconds()))
 986                 printk (KERN_WARNING
 987                         "EXT3-fs warning: checktime reached, "
 988                         "running e2fsck is recommended\n");
 989 #if 0
 990                 /* @@@ We _will_ want to clear the valid bit if we find
 991                    inconsistencies, to force a fsck at reboot.  But for
 992                    a plain journaled filesystem we can keep it set as
 993                    valid forever! :) */
 994         es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & ~EXT3_VALID_FS);
 995 #endif
 996         if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
 997                 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
 998         es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1);
 999         es->s_mtime = cpu_to_le32(get_seconds());
1000         ext3_update_dynamic_rev(sb);
1001         EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1002
1003         ext3_commit_super(sb, es, 1);
1004         if (test_opt(sb, DEBUG))
1005                 printk(KERN_INFO "[EXT3 FS bs=%lu, gc=%lu, "
1006                                 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1007                         sb->s_blocksize,
1008                         sbi->s_groups_count,
1009                         EXT3_BLOCKS_PER_GROUP(sb),
1010                         EXT3_INODES_PER_GROUP(sb),
1011                         sbi->s_mount_opt);
1012
1013         printk(KERN_INFO "EXT3 FS on %s, ", sb->s_id);
1014         if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1015                 char b[BDEVNAME_SIZE];
1016
1017                 printk("external journal on %s\n",
1018                         bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1019         } else {
1020                 printk("internal journal\n");
1021         }
1022 #ifdef CONFIG_EXT3_CHECK
1023         if (test_opt (sb, CHECK)) {
1024                 ext3_check_blocks_bitmap (sb);
1025                 ext3_check_inodes_bitmap (sb);
1026         }
1027 #endif
1028         return res;
1029 }
1030
1031 /* Called at mount-time, super-block is locked */
1032 static int ext3_check_descriptors (struct super_block * sb)
1033 {
1034         struct ext3_sb_info *sbi = EXT3_SB(sb);
1035         unsigned long block = le32_to_cpu(sbi->s_es->s_first_data_block);
1036         struct ext3_group_desc * gdp = NULL;
1037         int desc_block = 0;
1038         int i;
1039
1040         ext3_debug ("Checking group descriptors");
1041
1042         for (i = 0; i < sbi->s_groups_count; i++)
1043         {
1044                 if ((i % EXT3_DESC_PER_BLOCK(sb)) == 0)
1045                         gdp = (struct ext3_group_desc *)
1046                                         sbi->s_group_desc[desc_block++]->b_data;
1047                 if (le32_to_cpu(gdp->bg_block_bitmap) < block ||
1048                     le32_to_cpu(gdp->bg_block_bitmap) >=
1049                                 block + EXT3_BLOCKS_PER_GROUP(sb))
1050                 {
1051                         ext3_error (sb, "ext3_check_descriptors",
1052                                     "Block bitmap for group %d"
1053                                     " not in group (block %lu)!",
1054                                     i, (unsigned long)
1055                                         le32_to_cpu(gdp->bg_block_bitmap));
1056                         return 0;
1057                 }
1058                 if (le32_to_cpu(gdp->bg_inode_bitmap) < block ||
1059                     le32_to_cpu(gdp->bg_inode_bitmap) >=
1060                                 block + EXT3_BLOCKS_PER_GROUP(sb))
1061                 {
1062                         ext3_error (sb, "ext3_check_descriptors",
1063                                     "Inode bitmap for group %d"
1064                                     " not in group (block %lu)!",
1065                                     i, (unsigned long)
1066                                         le32_to_cpu(gdp->bg_inode_bitmap));
1067                         return 0;
1068                 }
1069                 if (le32_to_cpu(gdp->bg_inode_table) < block ||
1070                     le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group >=
1071                     block + EXT3_BLOCKS_PER_GROUP(sb))
1072                 {
1073                         ext3_error (sb, "ext3_check_descriptors",
1074                                     "Inode table for group %d"
1075                                     " not in group (block %lu)!",
1076                                     i, (unsigned long)
1077                                         le32_to_cpu(gdp->bg_inode_table));
1078                         return 0;
1079                 }
1080                 block += EXT3_BLOCKS_PER_GROUP(sb);
1081                 gdp++;
1082         }
1083
1084         sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1085         sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1086         return 1;
1087 }
1088
1089
1090 /* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1091  * the superblock) which were deleted from all directories, but held open by
1092  * a process at the time of a crash.  We walk the list and try to delete these
1093  * inodes at recovery time (only with a read-write filesystem).
1094  *
1095  * In order to keep the orphan inode chain consistent during traversal (in
1096  * case of crash during recovery), we link each inode into the superblock
1097  * orphan list_head and handle it the same way as an inode deletion during
1098  * normal operation (which journals the operations for us).
1099  *
1100  * We only do an iget() and an iput() on each inode, which is very safe if we
1101  * accidentally point at an in-use or already deleted inode.  The worst that
1102  * can happen in this case is that we get a "bit already cleared" message from
1103  * ext3_free_inode().  The only reason we would point at a wrong inode is if
1104  * e2fsck was run on this filesystem, and it must have already done the orphan
1105  * inode cleanup for us, so we can safely abort without any further action.
1106  */
1107 static void ext3_orphan_cleanup (struct super_block * sb,
1108                                  struct ext3_super_block * es)
1109 {
1110         unsigned int s_flags = sb->s_flags;
1111         int nr_orphans = 0, nr_truncates = 0;
1112 #ifdef CONFIG_QUOTA
1113         int i;
1114 #endif
1115         if (!es->s_last_orphan) {
1116                 jbd_debug(4, "no orphan inodes to clean up\n");
1117                 return;
1118         }
1119
1120         if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1121                 if (es->s_last_orphan)
1122                         jbd_debug(1, "Errors on filesystem, "
1123                                   "clearing orphan list.\n");
1124                 es->s_last_orphan = 0;
1125                 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1126                 return;
1127         }
1128
1129         if (s_flags & MS_RDONLY) {
1130                 printk(KERN_INFO "EXT3-fs: %s: orphan cleanup on readonly fs\n",
1131                        sb->s_id);
1132                 sb->s_flags &= ~MS_RDONLY;
1133         }
1134 #ifdef CONFIG_QUOTA
1135         /* Needed for iput() to work correctly and not trash data */
1136         sb->s_flags |= MS_ACTIVE;
1137         /* Turn on quotas so that they are updated correctly */
1138         for (i = 0; i < MAXQUOTAS; i++) {
1139                 if (EXT3_SB(sb)->s_qf_names[i]) {
1140                         int ret = ext3_quota_on_mount(sb, i);
1141                         if (ret < 0)
1142                                 printk(KERN_ERR
1143                                         "EXT3-fs: Cannot turn on journalled "
1144                                         "quota: error %d\n", ret);
1145                 }
1146         }
1147 #endif
1148
1149         while (es->s_last_orphan) {
1150                 struct inode *inode;
1151
1152                 if (!(inode =
1153                       ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan)))) {
1154                         es->s_last_orphan = 0;
1155                         break;
1156                 }
1157
1158                 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1159                 DQUOT_INIT(inode);
1160                 if (inode->i_nlink) {
1161                         printk(KERN_DEBUG
1162                                 "%s: truncating inode %ld to %Ld bytes\n",
1163                                 __FUNCTION__, inode->i_ino, inode->i_size);
1164                         jbd_debug(2, "truncating inode %ld to %Ld bytes\n",
1165                                   inode->i_ino, inode->i_size);
1166                         ext3_truncate(inode);
1167                         nr_truncates++;
1168                 } else {
1169                         printk(KERN_DEBUG
1170                                 "%s: deleting unreferenced inode %ld\n",
1171                                 __FUNCTION__, inode->i_ino);
1172                         jbd_debug(2, "deleting unreferenced inode %ld\n",
1173                                   inode->i_ino);
1174                         nr_orphans++;
1175                 }
1176                 iput(inode);  /* The delete magic happens here! */
1177         }
1178
1179 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1180
1181         if (nr_orphans)
1182                 printk(KERN_INFO "EXT3-fs: %s: %d orphan inode%s deleted\n",
1183                        sb->s_id, PLURAL(nr_orphans));
1184         if (nr_truncates)
1185                 printk(KERN_INFO "EXT3-fs: %s: %d truncate%s cleaned up\n",
1186                        sb->s_id, PLURAL(nr_truncates));
1187 #ifdef CONFIG_QUOTA
1188         /* Turn quotas off */
1189         for (i = 0; i < MAXQUOTAS; i++) {
1190                 if (sb_dqopt(sb)->files[i])
1191                         vfs_quota_off(sb, i);
1192         }
1193 #endif
1194         sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1195 }
1196
1197 #define log2(n) ffz(~(n))
1198
1199 /*
1200  * Maximal file size.  There is a direct, and {,double-,triple-}indirect
1201  * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1202  * We need to be 1 filesystem block less than the 2^32 sector limit.
1203  */
1204 static loff_t ext3_max_size(int bits)
1205 {
1206         loff_t res = EXT3_NDIR_BLOCKS;
1207         /* This constant is calculated to be the largest file size for a
1208          * dense, 4k-blocksize file such that the total number of
1209          * sectors in the file, including data and all indirect blocks,
1210          * does not exceed 2^32. */
1211         const loff_t upper_limit = 0x1ff7fffd000LL;
1212
1213         res += 1LL << (bits-2);
1214         res += 1LL << (2*(bits-2));
1215         res += 1LL << (3*(bits-2));
1216         res <<= bits;
1217         if (res > upper_limit)
1218                 res = upper_limit;
1219         return res;
1220 }
1221
1222 static unsigned long descriptor_loc(struct super_block *sb,
1223                                     unsigned long logic_sb_block,
1224                                     int nr)
1225 {
1226         struct ext3_sb_info *sbi = EXT3_SB(sb);
1227         unsigned long bg, first_data_block, first_meta_bg;
1228         int has_super = 0;
1229
1230         first_data_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1231         first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1232
1233         if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1234             nr < first_meta_bg)
1235                 return (logic_sb_block + nr + 1);
1236         bg = sbi->s_desc_per_block * nr;
1237         if (ext3_bg_has_super(sb, bg))
1238                 has_super = 1;
1239         return (first_data_block + has_super + (bg * sbi->s_blocks_per_group));
1240 }
1241
1242
1243 static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1244 {
1245         struct buffer_head * bh;
1246         struct ext3_super_block *es = NULL;
1247         struct ext3_sb_info *sbi;
1248         unsigned long block;
1249         unsigned long sb_block = get_sb_block(&data);
1250         unsigned long logic_sb_block;
1251         unsigned long offset = 0;
1252         unsigned long journal_inum = 0;
1253         unsigned long def_mount_opts;
1254         struct inode *root;
1255         int blocksize;
1256         int hblock;
1257         int db_count;
1258         int i;
1259         int needs_recovery;
1260         __le32 features;
1261
1262         sbi = kmalloc(sizeof(*sbi), GFP_KERNEL);
1263         if (!sbi)
1264                 return -ENOMEM;
1265         sb->s_fs_info = sbi;
1266         memset(sbi, 0, sizeof(*sbi));
1267         sbi->s_mount_opt = 0;
1268         sbi->s_resuid = EXT3_DEF_RESUID;
1269         sbi->s_resgid = EXT3_DEF_RESGID;
1270
1271         unlock_kernel();
1272
1273         blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1274         if (!blocksize) {
1275                 printk(KERN_ERR "EXT3-fs: unable to set blocksize\n");
1276                 goto out_fail;
1277         }
1278
1279         /*
1280          * The ext3 superblock will not be buffer aligned for other than 1kB
1281          * block sizes.  We need to calculate the offset from buffer start.
1282          */
1283         if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1284                 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1285                 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1286         } else {
1287                 logic_sb_block = sb_block;
1288         }
1289
1290         if (!(bh = sb_bread(sb, logic_sb_block))) {
1291                 printk (KERN_ERR "EXT3-fs: unable to read superblock\n");
1292                 goto out_fail;
1293         }
1294         /*
1295          * Note: s_es must be initialized as soon as possible because
1296          *       some ext3 macro-instructions depend on its value
1297          */
1298         es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1299         sbi->s_es = es;
1300         sb->s_magic = le16_to_cpu(es->s_magic);
1301         if (sb->s_magic != EXT3_SUPER_MAGIC)
1302                 goto cantfind_ext3;
1303
1304         /* Set defaults before we parse the mount options */
1305         def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1306         if (def_mount_opts & EXT3_DEFM_DEBUG)
1307                 set_opt(sbi->s_mount_opt, DEBUG);
1308         if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1309                 set_opt(sbi->s_mount_opt, GRPID);
1310         if (def_mount_opts & EXT3_DEFM_UID16)
1311                 set_opt(sbi->s_mount_opt, NO_UID32);
1312         if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1313                 set_opt(sbi->s_mount_opt, XATTR_USER);
1314         if (def_mount_opts & EXT3_DEFM_ACL)
1315                 set_opt(sbi->s_mount_opt, POSIX_ACL);
1316         if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1317                 sbi->s_mount_opt |= EXT3_MOUNT_JOURNAL_DATA;
1318         else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1319                 sbi->s_mount_opt |= EXT3_MOUNT_ORDERED_DATA;
1320         else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1321                 sbi->s_mount_opt |= EXT3_MOUNT_WRITEBACK_DATA;
1322
1323         if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1324                 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1325         else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_RO)
1326                 set_opt(sbi->s_mount_opt, ERRORS_RO);
1327
1328         sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1329         sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1330
1331         set_opt(sbi->s_mount_opt, RESERVATION);
1332
1333         if (!parse_options ((char *) data, sb, &journal_inum, NULL, 0))
1334                 goto failed_mount;
1335
1336         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1337                 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1338
1339         if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1340             (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1341              EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1342              EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1343                 printk(KERN_WARNING
1344                        "EXT3-fs warning: feature flags set on rev 0 fs, "
1345                        "running e2fsck is recommended\n");
1346         /*
1347          * Check feature flags regardless of the revision level, since we
1348          * previously didn't change the revision level when setting the flags,
1349          * so there is a chance incompat flags are set on a rev 0 filesystem.
1350          */
1351         features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1352         if (features) {
1353                 printk(KERN_ERR "EXT3-fs: %s: couldn't mount because of "
1354                        "unsupported optional features (%x).\n",
1355                        sb->s_id, le32_to_cpu(features));
1356                 goto failed_mount;
1357         }
1358         features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1359         if (!(sb->s_flags & MS_RDONLY) && features) {
1360                 printk(KERN_ERR "EXT3-fs: %s: couldn't mount RDWR because of "
1361                        "unsupported optional features (%x).\n",
1362                        sb->s_id, le32_to_cpu(features));
1363                 goto failed_mount;
1364         }
1365         blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1366
1367         if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1368             blocksize > EXT3_MAX_BLOCK_SIZE) {
1369                 printk(KERN_ERR
1370                        "EXT3-fs: Unsupported filesystem blocksize %d on %s.\n",
1371                        blocksize, sb->s_id);
1372                 goto failed_mount;
1373         }
1374
1375         hblock = bdev_hardsect_size(sb->s_bdev);
1376         if (sb->s_blocksize != blocksize) {
1377                 /*
1378                  * Make sure the blocksize for the filesystem is larger
1379                  * than the hardware sectorsize for the machine.
1380                  */
1381                 if (blocksize < hblock) {
1382                         printk(KERN_ERR "EXT3-fs: blocksize %d too small for "
1383                                "device blocksize %d.\n", blocksize, hblock);
1384                         goto failed_mount;
1385                 }
1386
1387                 brelse (bh);
1388                 sb_set_blocksize(sb, blocksize);
1389                 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1390                 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1391                 bh = sb_bread(sb, logic_sb_block);
1392                 if (!bh) {
1393                         printk(KERN_ERR
1394                                "EXT3-fs: Can't read superblock on 2nd try.\n");
1395                         goto failed_mount;
1396                 }
1397                 es = (struct ext3_super_block *)(((char *)bh->b_data) + offset);
1398                 sbi->s_es = es;
1399                 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
1400                         printk (KERN_ERR
1401                                 "EXT3-fs: Magic mismatch, very weird !\n");
1402                         goto failed_mount;
1403                 }
1404         }
1405
1406         sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1407
1408         if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1409                 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1410                 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1411         } else {
1412                 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1413                 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1414                 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
1415                     (sbi->s_inode_size & (sbi->s_inode_size - 1)) ||
1416                     (sbi->s_inode_size > blocksize)) {
1417                         printk (KERN_ERR
1418                                 "EXT3-fs: unsupported inode size: %d\n",
1419                                 sbi->s_inode_size);
1420                         goto failed_mount;
1421                 }
1422         }
1423         sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1424                                    le32_to_cpu(es->s_log_frag_size);
1425         if (blocksize != sbi->s_frag_size) {
1426                 printk(KERN_ERR
1427                        "EXT3-fs: fragsize %lu != blocksize %u (unsupported)\n",
1428                        sbi->s_frag_size, blocksize);
1429                 goto failed_mount;
1430         }
1431         sbi->s_frags_per_block = 1;
1432         sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1433         sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1434         sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1435         if (EXT3_INODE_SIZE(sb) == 0)
1436                 goto cantfind_ext3;
1437         sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1438         if (sbi->s_inodes_per_block == 0)
1439                 goto cantfind_ext3;
1440         sbi->s_itb_per_group = sbi->s_inodes_per_group /
1441                                         sbi->s_inodes_per_block;
1442         sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1443         sbi->s_sbh = bh;
1444         sbi->s_mount_state = le16_to_cpu(es->s_state);
1445         sbi->s_addr_per_block_bits = log2(EXT3_ADDR_PER_BLOCK(sb));
1446         sbi->s_desc_per_block_bits = log2(EXT3_DESC_PER_BLOCK(sb));
1447         for (i=0; i < 4; i++)
1448                 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1449         sbi->s_def_hash_version = es->s_def_hash_version;
1450
1451         if (sbi->s_blocks_per_group > blocksize * 8) {
1452                 printk (KERN_ERR
1453                         "EXT3-fs: #blocks per group too big: %lu\n",
1454                         sbi->s_blocks_per_group);
1455                 goto failed_mount;
1456         }
1457         if (sbi->s_frags_per_group > blocksize * 8) {
1458                 printk (KERN_ERR
1459                         "EXT3-fs: #fragments per group too big: %lu\n",
1460                         sbi->s_frags_per_group);
1461                 goto failed_mount;
1462         }
1463         if (sbi->s_inodes_per_group > blocksize * 8) {
1464                 printk (KERN_ERR
1465                         "EXT3-fs: #inodes per group too big: %lu\n",
1466                         sbi->s_inodes_per_group);
1467                 goto failed_mount;
1468         }
1469
1470         if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1471                 goto cantfind_ext3;
1472         sbi->s_groups_count = (le32_to_cpu(es->s_blocks_count) -
1473                                le32_to_cpu(es->s_first_data_block) +
1474                                EXT3_BLOCKS_PER_GROUP(sb) - 1) /
1475                               EXT3_BLOCKS_PER_GROUP(sb);
1476         db_count = (sbi->s_groups_count + EXT3_DESC_PER_BLOCK(sb) - 1) /
1477                    EXT3_DESC_PER_BLOCK(sb);
1478         sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1479                                     GFP_KERNEL);
1480         if (sbi->s_group_desc == NULL) {
1481                 printk (KERN_ERR "EXT3-fs: not enough memory\n");
1482                 goto failed_mount;
1483         }
1484
1485         percpu_counter_init(&sbi->s_freeblocks_counter);
1486         percpu_counter_init(&sbi->s_freeinodes_counter);
1487         percpu_counter_init(&sbi->s_dirs_counter);
1488         bgl_lock_init(&sbi->s_blockgroup_lock);
1489
1490         for (i = 0; i < db_count; i++) {
1491                 block = descriptor_loc(sb, logic_sb_block, i);
1492                 sbi->s_group_desc[i] = sb_bread(sb, block);
1493                 if (!sbi->s_group_desc[i]) {
1494                         printk (KERN_ERR "EXT3-fs: "
1495                                 "can't read group descriptor %d\n", i);
1496                         db_count = i;
1497                         goto failed_mount2;
1498                 }
1499         }
1500         if (!ext3_check_descriptors (sb)) {
1501                 printk (KERN_ERR "EXT3-fs: group descriptors corrupted !\n");
1502                 goto failed_mount2;
1503         }
1504         sbi->s_gdb_count = db_count;
1505         get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1506         spin_lock_init(&sbi->s_next_gen_lock);
1507         /* per fileystem reservation list head & lock */
1508         spin_lock_init(&sbi->s_rsv_window_lock);
1509         sbi->s_rsv_window_root = RB_ROOT;
1510         /* Add a single, static dummy reservation to the start of the
1511          * reservation window list --- it gives us a placeholder for
1512          * append-at-start-of-list which makes the allocation logic
1513          * _much_ simpler. */
1514         sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1515         sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1516         sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1517         sbi->s_rsv_window_head.rsv_goal_size = 0;
1518         ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1519
1520         /*
1521          * set up enough so that it can read an inode
1522          */
1523         sb->s_op = &ext3_sops;
1524         sb->s_export_op = &ext3_export_ops;
1525         sb->s_xattr = ext3_xattr_handlers;
1526 #ifdef CONFIG_QUOTA
1527         sb->s_qcop = &ext3_qctl_operations;
1528         sb->dq_op = &ext3_quota_operations;
1529 #endif
1530         INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1531
1532         sb->s_root = NULL;
1533
1534         needs_recovery = (es->s_last_orphan != 0 ||
1535                           EXT3_HAS_INCOMPAT_FEATURE(sb,
1536                                     EXT3_FEATURE_INCOMPAT_RECOVER));
1537
1538         /*
1539          * The first inode we look at is the journal inode.  Don't try
1540          * root first: it may be modified in the journal!
1541          */
1542         if (!test_opt(sb, NOLOAD) &&
1543             EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
1544                 if (ext3_load_journal(sb, es))
1545                         goto failed_mount2;
1546         } else if (journal_inum) {
1547                 if (ext3_create_journal(sb, es, journal_inum))
1548                         goto failed_mount2;
1549         } else {
1550                 if (!silent)
1551                         printk (KERN_ERR
1552                                 "ext3: No journal on filesystem on %s\n",
1553                                 sb->s_id);
1554                 goto failed_mount2;
1555         }
1556
1557         /* We have now updated the journal if required, so we can
1558          * validate the data journaling mode. */
1559         switch (test_opt(sb, DATA_FLAGS)) {
1560         case 0:
1561                 /* No mode set, assume a default based on the journal
1562                    capabilities: ORDERED_DATA if the journal can
1563                    cope, else JOURNAL_DATA */
1564                 if (journal_check_available_features
1565                     (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
1566                         set_opt(sbi->s_mount_opt, ORDERED_DATA);
1567                 else
1568                         set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1569                 break;
1570
1571         case EXT3_MOUNT_ORDERED_DATA:
1572         case EXT3_MOUNT_WRITEBACK_DATA:
1573                 if (!journal_check_available_features
1574                     (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
1575                         printk(KERN_ERR "EXT3-fs: Journal does not support "
1576                                "requested data journaling mode\n");
1577                         goto failed_mount3;
1578                 }
1579         default:
1580                 break;
1581         }
1582
1583         if (test_opt(sb, NOBH)) {
1584                 if (sb->s_blocksize_bits != PAGE_CACHE_SHIFT) {
1585                         printk(KERN_WARNING "EXT3-fs: Ignoring nobh option "
1586                                 "since filesystem blocksize doesn't match "
1587                                 "pagesize\n");
1588                         clear_opt(sbi->s_mount_opt, NOBH);
1589                 }
1590                 if (!(test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)) {
1591                         printk(KERN_WARNING "EXT3-fs: Ignoring nobh option - "
1592                                 "its supported only with writeback mode\n");
1593                         clear_opt(sbi->s_mount_opt, NOBH);
1594                 }
1595         }
1596         /*
1597          * The journal_load will have done any necessary log recovery,
1598          * so we can safely mount the rest of the filesystem now.
1599          */
1600
1601         root = iget(sb, EXT3_ROOT_INO);
1602         sb->s_root = d_alloc_root(root);
1603         if (!sb->s_root) {
1604                 printk(KERN_ERR "EXT3-fs: get root inode failed\n");
1605                 iput(root);
1606                 goto failed_mount3;
1607         }
1608         if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1609                 dput(sb->s_root);
1610                 sb->s_root = NULL;
1611                 printk(KERN_ERR "EXT3-fs: corrupt root inode, run e2fsck\n");
1612                 goto failed_mount3;
1613         }
1614
1615         ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
1616         /*
1617          * akpm: core read_super() calls in here with the superblock locked.
1618          * That deadlocks, because orphan cleanup needs to lock the superblock
1619          * in numerous places.  Here we just pop the lock - it's relatively
1620          * harmless, because we are now ready to accept write_super() requests,
1621          * and aviro says that's the only reason for hanging onto the
1622          * superblock lock.
1623          */
1624         EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
1625         ext3_orphan_cleanup(sb, es);
1626         EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
1627         if (needs_recovery)
1628                 printk (KERN_INFO "EXT3-fs: recovery complete.\n");
1629         ext3_mark_recovery_complete(sb, es);
1630         printk (KERN_INFO "EXT3-fs: mounted filesystem with %s data mode.\n",
1631                 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
1632                 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
1633                 "writeback");
1634
1635         percpu_counter_mod(&sbi->s_freeblocks_counter,
1636                 ext3_count_free_blocks(sb));
1637         percpu_counter_mod(&sbi->s_freeinodes_counter,
1638                 ext3_count_free_inodes(sb));
1639         percpu_counter_mod(&sbi->s_dirs_counter,
1640                 ext3_count_dirs(sb));
1641
1642         lock_kernel();
1643         return 0;
1644
1645 cantfind_ext3:
1646         if (!silent)
1647                 printk(KERN_ERR "VFS: Can't find ext3 filesystem on dev %s.\n",
1648                        sb->s_id);
1649         goto failed_mount;
1650
1651 failed_mount3:
1652         journal_destroy(sbi->s_journal);
1653 failed_mount2:
1654         for (i = 0; i < db_count; i++)
1655                 brelse(sbi->s_group_desc[i]);
1656         kfree(sbi->s_group_desc);
1657 failed_mount:
1658 #ifdef CONFIG_QUOTA
1659         for (i = 0; i < MAXQUOTAS; i++)
1660                 kfree(sbi->s_qf_names[i]);
1661 #endif
1662         ext3_blkdev_remove(sbi);
1663         brelse(bh);
1664 out_fail:
1665         sb->s_fs_info = NULL;
1666         kfree(sbi);
1667         lock_kernel();
1668         return -EINVAL;
1669 }
1670
1671 /*
1672  * Setup any per-fs journal parameters now.  We'll do this both on
1673  * initial mount, once the journal has been initialised but before we've
1674  * done any recovery; and again on any subsequent remount.
1675  */
1676 static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
1677 {
1678         struct ext3_sb_info *sbi = EXT3_SB(sb);
1679
1680         if (sbi->s_commit_interval)
1681                 journal->j_commit_interval = sbi->s_commit_interval;
1682         /* We could also set up an ext3-specific default for the commit
1683          * interval here, but for now we'll just fall back to the jbd
1684          * default. */
1685
1686         spin_lock(&journal->j_state_lock);
1687         if (test_opt(sb, BARRIER))
1688                 journal->j_flags |= JFS_BARRIER;
1689         else
1690                 journal->j_flags &= ~JFS_BARRIER;
1691         spin_unlock(&journal->j_state_lock);
1692 }
1693
1694 static journal_t *ext3_get_journal(struct super_block *sb, int journal_inum)
1695 {
1696         struct inode *journal_inode;
1697         journal_t *journal;
1698
1699         /* First, test for the existence of a valid inode on disk.  Bad
1700          * things happen if we iget() an unused inode, as the subsequent
1701          * iput() will try to delete it. */
1702
1703         journal_inode = iget(sb, journal_inum);
1704         if (!journal_inode) {
1705                 printk(KERN_ERR "EXT3-fs: no journal found.\n");
1706                 return NULL;
1707         }
1708         if (!journal_inode->i_nlink) {
1709                 make_bad_inode(journal_inode);
1710                 iput(journal_inode);
1711                 printk(KERN_ERR "EXT3-fs: journal inode is deleted.\n");
1712                 return NULL;
1713         }
1714
1715         jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
1716                   journal_inode, journal_inode->i_size);
1717         if (is_bad_inode(journal_inode) || !S_ISREG(journal_inode->i_mode)) {
1718                 printk(KERN_ERR "EXT3-fs: invalid journal inode.\n");
1719                 iput(journal_inode);
1720                 return NULL;
1721         }
1722
1723         journal = journal_init_inode(journal_inode);
1724         if (!journal) {
1725                 printk(KERN_ERR "EXT3-fs: Could not load journal inode\n");
1726                 iput(journal_inode);
1727                 return NULL;
1728         }
1729         journal->j_private = sb;
1730         ext3_init_journal_params(sb, journal);
1731         return journal;
1732 }
1733
1734 static journal_t *ext3_get_dev_journal(struct super_block *sb,
1735                                        dev_t j_dev)
1736 {
1737         struct buffer_head * bh;
1738         journal_t *journal;
1739         int start;
1740         int len;
1741         int hblock, blocksize;
1742         unsigned long sb_block;
1743         unsigned long offset;
1744         struct ext3_super_block * es;
1745         struct block_device *bdev;
1746
1747         bdev = ext3_blkdev_get(j_dev);
1748         if (bdev == NULL)
1749                 return NULL;
1750
1751         if (bd_claim(bdev, sb)) {
1752                 printk(KERN_ERR
1753                         "EXT3: failed to claim external journal device.\n");
1754                 blkdev_put(bdev);
1755                 return NULL;
1756         }
1757
1758         blocksize = sb->s_blocksize;
1759         hblock = bdev_hardsect_size(bdev);
1760         if (blocksize < hblock) {
1761                 printk(KERN_ERR
1762                         "EXT3-fs: blocksize too small for journal device.\n");
1763                 goto out_bdev;
1764         }
1765
1766         sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
1767         offset = EXT3_MIN_BLOCK_SIZE % blocksize;
1768         set_blocksize(bdev, blocksize);
1769         if (!(bh = __bread(bdev, sb_block, blocksize))) {
1770                 printk(KERN_ERR "EXT3-fs: couldn't read superblock of "
1771                        "external journal\n");
1772                 goto out_bdev;
1773         }
1774
1775         es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1776         if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
1777             !(le32_to_cpu(es->s_feature_incompat) &
1778               EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
1779                 printk(KERN_ERR "EXT3-fs: external journal has "
1780                                         "bad superblock\n");
1781                 brelse(bh);
1782                 goto out_bdev;
1783         }
1784
1785         if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
1786                 printk(KERN_ERR "EXT3-fs: journal UUID does not match\n");
1787                 brelse(bh);
1788                 goto out_bdev;
1789         }
1790
1791         len = le32_to_cpu(es->s_blocks_count);
1792         start = sb_block + 1;
1793         brelse(bh);     /* we're done with the superblock */
1794
1795         journal = journal_init_dev(bdev, sb->s_bdev,
1796                                         start, len, blocksize);
1797         if (!journal) {
1798                 printk(KERN_ERR "EXT3-fs: failed to create device journal\n");
1799                 goto out_bdev;
1800         }
1801         journal->j_private = sb;
1802         ll_rw_block(READ, 1, &journal->j_sb_buffer);
1803         wait_on_buffer(journal->j_sb_buffer);
1804         if (!buffer_uptodate(journal->j_sb_buffer)) {
1805                 printk(KERN_ERR "EXT3-fs: I/O error on journal device\n");
1806                 goto out_journal;
1807         }
1808         if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
1809                 printk(KERN_ERR "EXT3-fs: External journal has more than one "
1810                                         "user (unsupported) - %d\n",
1811                         be32_to_cpu(journal->j_superblock->s_nr_users));
1812                 goto out_journal;
1813         }
1814         EXT3_SB(sb)->journal_bdev = bdev;
1815         ext3_init_journal_params(sb, journal);
1816         return journal;
1817 out_journal:
1818         journal_destroy(journal);
1819 out_bdev:
1820         ext3_blkdev_put(bdev);
1821         return NULL;
1822 }
1823
1824 static int ext3_load_journal(struct super_block * sb,
1825                              struct ext3_super_block * es)
1826 {
1827         journal_t *journal;
1828         int journal_inum = le32_to_cpu(es->s_journal_inum);
1829         dev_t journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
1830         int err = 0;
1831         int really_read_only;
1832
1833         really_read_only = bdev_read_only(sb->s_bdev);
1834
1835         /*
1836          * Are we loading a blank journal or performing recovery after a
1837          * crash?  For recovery, we need to check in advance whether we
1838          * can get read-write access to the device.
1839          */
1840
1841         if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
1842                 if (sb->s_flags & MS_RDONLY) {
1843                         printk(KERN_INFO "EXT3-fs: INFO: recovery "
1844                                         "required on readonly filesystem.\n");
1845                         if (really_read_only) {
1846                                 printk(KERN_ERR "EXT3-fs: write access "
1847                                         "unavailable, cannot proceed.\n");
1848                                 return -EROFS;
1849                         }
1850                         printk (KERN_INFO "EXT3-fs: write access will "
1851                                         "be enabled during recovery.\n");
1852                 }
1853         }
1854
1855         if (journal_inum && journal_dev) {
1856                 printk(KERN_ERR "EXT3-fs: filesystem has both journal "
1857                        "and inode journals!\n");
1858                 return -EINVAL;
1859         }
1860
1861         if (journal_inum) {
1862                 if (!(journal = ext3_get_journal(sb, journal_inum)))
1863                         return -EINVAL;
1864         } else {
1865                 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
1866                         return -EINVAL;
1867         }
1868
1869         if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
1870                 err = journal_update_format(journal);
1871                 if (err)  {
1872                         printk(KERN_ERR "EXT3-fs: error updating journal.\n");
1873                         journal_destroy(journal);
1874                         return err;
1875                 }
1876         }
1877
1878         if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
1879                 err = journal_wipe(journal, !really_read_only);
1880         if (!err)
1881                 err = journal_load(journal);
1882
1883         if (err) {
1884                 printk(KERN_ERR "EXT3-fs: error loading journal.\n");
1885                 journal_destroy(journal);
1886                 return err;
1887         }
1888
1889         EXT3_SB(sb)->s_journal = journal;
1890         ext3_clear_journal_err(sb, es);
1891         return 0;
1892 }
1893
1894 static int ext3_create_journal(struct super_block * sb,
1895                                struct ext3_super_block * es,
1896                                int journal_inum)
1897 {
1898         journal_t *journal;
1899
1900         if (sb->s_flags & MS_RDONLY) {
1901                 printk(KERN_ERR "EXT3-fs: readonly filesystem when trying to "
1902                                 "create journal.\n");
1903                 return -EROFS;
1904         }
1905
1906         if (!(journal = ext3_get_journal(sb, journal_inum)))
1907                 return -EINVAL;
1908
1909         printk(KERN_INFO "EXT3-fs: creating new journal on inode %d\n",
1910                journal_inum);
1911
1912         if (journal_create(journal)) {
1913                 printk(KERN_ERR "EXT3-fs: error creating journal.\n");
1914                 journal_destroy(journal);
1915                 return -EIO;
1916         }
1917
1918         EXT3_SB(sb)->s_journal = journal;
1919
1920         ext3_update_dynamic_rev(sb);
1921         EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1922         EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
1923
1924         es->s_journal_inum = cpu_to_le32(journal_inum);
1925         sb->s_dirt = 1;
1926
1927         /* Make sure we flush the recovery flag to disk. */
1928         ext3_commit_super(sb, es, 1);
1929
1930         return 0;
1931 }
1932
1933 static void ext3_commit_super (struct super_block * sb,
1934                                struct ext3_super_block * es,
1935                                int sync)
1936 {
1937         struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
1938
1939         if (!sbh)
1940                 return;
1941         es->s_wtime = cpu_to_le32(get_seconds());
1942         es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
1943         es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
1944         BUFFER_TRACE(sbh, "marking dirty");
1945         mark_buffer_dirty(sbh);
1946         if (sync)
1947                 sync_dirty_buffer(sbh);
1948 }
1949
1950
1951 /*
1952  * Have we just finished recovery?  If so, and if we are mounting (or
1953  * remounting) the filesystem readonly, then we will end up with a
1954  * consistent fs on disk.  Record that fact.
1955  */
1956 static void ext3_mark_recovery_complete(struct super_block * sb,
1957                                         struct ext3_super_block * es)
1958 {
1959         journal_t *journal = EXT3_SB(sb)->s_journal;
1960
1961         journal_lock_updates(journal);
1962         journal_flush(journal);
1963         if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
1964             sb->s_flags & MS_RDONLY) {
1965                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1966                 sb->s_dirt = 0;
1967                 ext3_commit_super(sb, es, 1);
1968         }
1969         journal_unlock_updates(journal);
1970 }
1971
1972 /*
1973  * If we are mounting (or read-write remounting) a filesystem whose journal
1974  * has recorded an error from a previous lifetime, move that error to the
1975  * main filesystem now.
1976  */
1977 static void ext3_clear_journal_err(struct super_block * sb,
1978                                    struct ext3_super_block * es)
1979 {
1980         journal_t *journal;
1981         int j_errno;
1982         const char *errstr;
1983
1984         journal = EXT3_SB(sb)->s_journal;
1985
1986         /*
1987          * Now check for any error status which may have been recorded in the
1988          * journal by a prior ext3_error() or ext3_abort()
1989          */
1990
1991         j_errno = journal_errno(journal);
1992         if (j_errno) {
1993                 char nbuf[16];
1994
1995                 errstr = ext3_decode_error(sb, j_errno, nbuf);
1996                 ext3_warning(sb, __FUNCTION__, "Filesystem error recorded "
1997                              "from previous mount: %s", errstr);
1998                 ext3_warning(sb, __FUNCTION__, "Marking fs in need of "
1999                              "filesystem check.");
2000
2001                 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2002                 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2003                 ext3_commit_super (sb, es, 1);
2004
2005                 journal_clear_err(journal);
2006         }
2007 }
2008
2009 /*
2010  * Force the running and committing transactions to commit,
2011  * and wait on the commit.
2012  */
2013 int ext3_force_commit(struct super_block *sb)
2014 {
2015         journal_t *journal;
2016         int ret;
2017
2018         if (sb->s_flags & MS_RDONLY)
2019                 return 0;
2020
2021         journal = EXT3_SB(sb)->s_journal;
2022         sb->s_dirt = 0;
2023         ret = ext3_journal_force_commit(journal);
2024         return ret;
2025 }
2026
2027 /*
2028  * Ext3 always journals updates to the superblock itself, so we don't
2029  * have to propagate any other updates to the superblock on disk at this
2030  * point.  Just start an async writeback to get the buffers on their way
2031  * to the disk.
2032  *
2033  * This implicitly triggers the writebehind on sync().
2034  */
2035
2036 static void ext3_write_super (struct super_block * sb)
2037 {
2038         if (down_trylock(&sb->s_lock) == 0)
2039                 BUG();
2040         sb->s_dirt = 0;
2041 }
2042
2043 static int ext3_sync_fs(struct super_block *sb, int wait)
2044 {
2045         tid_t target;
2046
2047         sb->s_dirt = 0;
2048         if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2049                 if (wait)
2050                         log_wait_commit(EXT3_SB(sb)->s_journal, target);
2051         }
2052         return 0;
2053 }
2054
2055 /*
2056  * LVM calls this function before a (read-only) snapshot is created.  This
2057  * gives us a chance to flush the journal completely and mark the fs clean.
2058  */
2059 static void ext3_write_super_lockfs(struct super_block *sb)
2060 {
2061         sb->s_dirt = 0;
2062
2063         if (!(sb->s_flags & MS_RDONLY)) {
2064                 journal_t *journal = EXT3_SB(sb)->s_journal;
2065
2066                 /* Now we set up the journal barrier. */
2067                 journal_lock_updates(journal);
2068                 journal_flush(journal);
2069
2070                 /* Journal blocked and flushed, clear needs_recovery flag. */
2071                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2072                 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2073         }
2074 }
2075
2076 /*
2077  * Called by LVM after the snapshot is done.  We need to reset the RECOVER
2078  * flag here, even though the filesystem is not technically dirty yet.
2079  */
2080 static void ext3_unlockfs(struct super_block *sb)
2081 {
2082         if (!(sb->s_flags & MS_RDONLY)) {
2083                 lock_super(sb);
2084                 /* Reser the needs_recovery flag before the fs is unlocked. */
2085                 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2086                 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2087                 unlock_super(sb);
2088                 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2089         }
2090 }
2091
2092 static int ext3_remount (struct super_block * sb, int * flags, char * data)
2093 {
2094         struct ext3_super_block * es;
2095         struct ext3_sb_info *sbi = EXT3_SB(sb);
2096         unsigned long tmp;
2097         unsigned long n_blocks_count = 0;
2098
2099         /*
2100          * Allow the "check" option to be passed as a remount option.
2101          */
2102         if (!parse_options(data, sb, &tmp, &n_blocks_count, 1))
2103                 return -EINVAL;
2104
2105         if (sbi->s_mount_opt & EXT3_MOUNT_ABORT)
2106                 ext3_abort(sb, __FUNCTION__, "Abort forced by user");
2107
2108         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2109                 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2110
2111         es = sbi->s_es;
2112
2113         ext3_init_journal_params(sb, sbi->s_journal);
2114
2115         if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2116                 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
2117                 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT)
2118                         return -EROFS;
2119
2120                 if (*flags & MS_RDONLY) {
2121                         /*
2122                          * First of all, the unconditional stuff we have to do
2123                          * to disable replay of the journal when we next remount
2124                          */
2125                         sb->s_flags |= MS_RDONLY;
2126
2127                         /*
2128                          * OK, test if we are remounting a valid rw partition
2129                          * readonly, and if so set the rdonly flag and then
2130                          * mark the partition as valid again.
2131                          */
2132                         if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2133                             (sbi->s_mount_state & EXT3_VALID_FS))
2134                                 es->s_state = cpu_to_le16(sbi->s_mount_state);
2135
2136                         ext3_mark_recovery_complete(sb, es);
2137                 } else {
2138                         __le32 ret;
2139                         if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2140                                         ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2141                                 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2142                                        "remount RDWR because of unsupported "
2143                                        "optional features (%x).\n",
2144                                        sb->s_id, le32_to_cpu(ret));
2145                                 return -EROFS;
2146                         }
2147                         /*
2148                          * Mounting a RDONLY partition read-write, so reread
2149                          * and store the current valid flag.  (It may have
2150                          * been changed by e2fsck since we originally mounted
2151                          * the partition.)
2152                          */
2153                         ext3_clear_journal_err(sb, es);
2154                         sbi->s_mount_state = le16_to_cpu(es->s_state);
2155                         if ((ret = ext3_group_extend(sb, es, n_blocks_count)))
2156                                 return ret;
2157                         if (!ext3_setup_super (sb, es, 0))
2158                                 sb->s_flags &= ~MS_RDONLY;
2159                 }
2160         }
2161         return 0;
2162 }
2163
2164 static int ext3_statfs (struct super_block * sb, struct kstatfs * buf)
2165 {
2166         struct ext3_super_block *es = EXT3_SB(sb)->s_es;
2167         unsigned long overhead;
2168         int i;
2169
2170         if (test_opt (sb, MINIX_DF))
2171                 overhead = 0;
2172         else {
2173                 unsigned long ngroups;
2174                 ngroups = EXT3_SB(sb)->s_groups_count;
2175                 smp_rmb();
2176
2177                 /*
2178                  * Compute the overhead (FS structures)
2179                  */
2180
2181                 /*
2182                  * All of the blocks before first_data_block are
2183                  * overhead
2184                  */
2185                 overhead = le32_to_cpu(es->s_first_data_block);
2186
2187                 /*
2188                  * Add the overhead attributed to the superblock and
2189                  * block group descriptors.  If the sparse superblocks
2190                  * feature is turned on, then not all groups have this.
2191                  */
2192                 for (i = 0; i < ngroups; i++) {
2193                         overhead += ext3_bg_has_super(sb, i) +
2194                                 ext3_bg_num_gdb(sb, i);
2195                         cond_resched();
2196                 }
2197
2198                 /*
2199                  * Every block group has an inode bitmap, a block
2200                  * bitmap, and an inode table.
2201                  */
2202                 overhead += (ngroups * (2 + EXT3_SB(sb)->s_itb_per_group));
2203         }
2204
2205         buf->f_type = EXT3_SUPER_MAGIC;
2206         buf->f_bsize = sb->s_blocksize;
2207         buf->f_blocks = le32_to_cpu(es->s_blocks_count) - overhead;
2208         buf->f_bfree = ext3_count_free_blocks (sb);
2209         buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2210         if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2211                 buf->f_bavail = 0;
2212         buf->f_files = le32_to_cpu(es->s_inodes_count);
2213         buf->f_ffree = ext3_count_free_inodes (sb);
2214         buf->f_namelen = EXT3_NAME_LEN;
2215         return 0;
2216 }
2217
2218 /* Helper function for writing quotas on sync - we need to start transaction before quota file
2219  * is locked for write. Otherwise the are possible deadlocks:
2220  * Process 1                         Process 2
2221  * ext3_create()                     quota_sync()
2222  *   journal_start()                   write_dquot()
2223  *   DQUOT_INIT()                        down(dqio_sem)
2224  *     down(dqio_sem)                    journal_start()
2225  *
2226  */
2227
2228 #ifdef CONFIG_QUOTA
2229
2230 static inline struct inode *dquot_to_inode(struct dquot *dquot)
2231 {
2232         return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2233 }
2234
2235 static int ext3_dquot_initialize(struct inode *inode, int type)
2236 {
2237         handle_t *handle;
2238         int ret, err;
2239
2240         /* We may create quota structure so we need to reserve enough blocks */
2241         handle = ext3_journal_start(inode, 2*EXT3_QUOTA_INIT_BLOCKS);
2242         if (IS_ERR(handle))
2243                 return PTR_ERR(handle);
2244         ret = dquot_initialize(inode, type);
2245         err = ext3_journal_stop(handle);
2246         if (!ret)
2247                 ret = err;
2248         return ret;
2249 }
2250
2251 static int ext3_dquot_drop(struct inode *inode)
2252 {
2253         handle_t *handle;
2254         int ret, err;
2255
2256         /* We may delete quota structure so we need to reserve enough blocks */
2257         handle = ext3_journal_start(inode, 2*EXT3_QUOTA_INIT_BLOCKS);
2258         if (IS_ERR(handle))
2259                 return PTR_ERR(handle);
2260         ret = dquot_drop(inode);
2261         err = ext3_journal_stop(handle);
2262         if (!ret)
2263                 ret = err;
2264         return ret;
2265 }
2266
2267 static int ext3_write_dquot(struct dquot *dquot)
2268 {
2269         int ret, err;
2270         handle_t *handle;
2271         struct inode *inode;
2272
2273         inode = dquot_to_inode(dquot);
2274         handle = ext3_journal_start(inode,
2275                                         EXT3_QUOTA_TRANS_BLOCKS);
2276         if (IS_ERR(handle))
2277                 return PTR_ERR(handle);
2278         ret = dquot_commit(dquot);
2279         err = ext3_journal_stop(handle);
2280         if (!ret)
2281                 ret = err;
2282         return ret;
2283 }
2284
2285 static int ext3_acquire_dquot(struct dquot *dquot)
2286 {
2287         int ret, err;
2288         handle_t *handle;
2289
2290         handle = ext3_journal_start(dquot_to_inode(dquot),
2291                                         EXT3_QUOTA_INIT_BLOCKS);
2292         if (IS_ERR(handle))
2293                 return PTR_ERR(handle);
2294         ret = dquot_acquire(dquot);
2295         err = ext3_journal_stop(handle);
2296         if (!ret)
2297                 ret = err;
2298         return ret;
2299 }
2300
2301 static int ext3_release_dquot(struct dquot *dquot)
2302 {
2303         int ret, err;
2304         handle_t *handle;
2305
2306         handle = ext3_journal_start(dquot_to_inode(dquot),
2307                                         EXT3_QUOTA_INIT_BLOCKS);
2308         if (IS_ERR(handle))
2309                 return PTR_ERR(handle);
2310         ret = dquot_release(dquot);
2311         err = ext3_journal_stop(handle);
2312         if (!ret)
2313                 ret = err;
2314         return ret;
2315 }
2316
2317 static int ext3_mark_dquot_dirty(struct dquot *dquot)
2318 {
2319         /* Are we journalling quotas? */
2320         if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2321             EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2322                 dquot_mark_dquot_dirty(dquot);
2323                 return ext3_write_dquot(dquot);
2324         } else {
2325                 return dquot_mark_dquot_dirty(dquot);
2326         }
2327 }
2328
2329 static int ext3_write_info(struct super_block *sb, int type)
2330 {
2331         int ret, err;
2332         handle_t *handle;
2333
2334         /* Data block + inode block */
2335         handle = ext3_journal_start(sb->s_root->d_inode, 2);
2336         if (IS_ERR(handle))
2337                 return PTR_ERR(handle);
2338         ret = dquot_commit_info(sb, type);
2339         err = ext3_journal_stop(handle);
2340         if (!ret)
2341                 ret = err;
2342         return ret;
2343 }
2344
2345 /*
2346  * Turn on quotas during mount time - we need to find
2347  * the quota file and such...
2348  */
2349 static int ext3_quota_on_mount(struct super_block *sb, int type)
2350 {
2351         int err;
2352         struct dentry *dentry;
2353         struct qstr name = { .name = EXT3_SB(sb)->s_qf_names[type],
2354                              .hash = 0,
2355                              .len = strlen(EXT3_SB(sb)->s_qf_names[type])};
2356
2357         dentry = lookup_hash(&name, sb->s_root);
2358         if (IS_ERR(dentry))
2359                 return PTR_ERR(dentry);
2360         err = vfs_quota_on_mount(type, EXT3_SB(sb)->s_jquota_fmt, dentry);
2361         /* Now invalidate and put the dentry - quota got its own reference
2362          * to inode and dentry has at least wrong hash so we had better
2363          * throw it away */
2364         d_invalidate(dentry);
2365         dput(dentry);
2366         return err;
2367 }
2368
2369 /*
2370  * Standard function to be called on quota_on
2371  */
2372 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
2373                          char *path)
2374 {
2375         int err;
2376         struct nameidata nd;
2377
2378         /* Not journalling quota? */
2379         if (!EXT3_SB(sb)->s_qf_names[USRQUOTA] &&
2380             !EXT3_SB(sb)->s_qf_names[GRPQUOTA])
2381                 return vfs_quota_on(sb, type, format_id, path);
2382         err = path_lookup(path, LOOKUP_FOLLOW, &nd);
2383         if (err)
2384                 return err;
2385         /* Quotafile not on the same filesystem? */
2386         if (nd.mnt->mnt_sb != sb) {
2387                 path_release(&nd);
2388                 return -EXDEV;
2389         }
2390         /* Quotafile not of fs root? */
2391         if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode)
2392                 printk(KERN_WARNING
2393                         "EXT3-fs: Quota file not on filesystem root. "
2394                         "Journalled quota will not work.\n");
2395         path_release(&nd);
2396         return vfs_quota_on(sb, type, format_id, path);
2397 }
2398
2399 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2400  * acquiring the locks... As quota files are never truncated and quota code
2401  * itself serializes the operations (and noone else should touch the files)
2402  * we don't have to be afraid of races */
2403 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2404                                size_t len, loff_t off)
2405 {
2406         struct inode *inode = sb_dqopt(sb)->files[type];
2407         sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2408         int err = 0;
2409         int offset = off & (sb->s_blocksize - 1);
2410         int tocopy;
2411         size_t toread;
2412         struct buffer_head *bh;
2413         loff_t i_size = i_size_read(inode);
2414
2415         if (off > i_size)
2416                 return 0;
2417         if (off+len > i_size)
2418                 len = i_size-off;
2419         toread = len;
2420         while (toread > 0) {
2421                 tocopy = sb->s_blocksize - offset < toread ?
2422                                 sb->s_blocksize - offset : toread;
2423                 bh = ext3_bread(NULL, inode, blk, 0, &err);
2424                 if (err)
2425                         return err;
2426                 if (!bh)        /* A hole? */
2427                         memset(data, 0, tocopy);
2428                 else
2429                         memcpy(data, bh->b_data+offset, tocopy);
2430                 brelse(bh);
2431                 offset = 0;
2432                 toread -= tocopy;
2433                 data += tocopy;
2434                 blk++;
2435         }
2436         return len;
2437 }
2438
2439 /* Write to quotafile (we know the transaction is already started and has
2440  * enough credits) */
2441 static ssize_t ext3_quota_write(struct super_block *sb, int type,
2442                                 const char *data, size_t len, loff_t off)
2443 {
2444         struct inode *inode = sb_dqopt(sb)->files[type];
2445         sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2446         int err = 0;
2447         int offset = off & (sb->s_blocksize - 1);
2448         int tocopy;
2449         int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
2450         size_t towrite = len;
2451         struct buffer_head *bh;
2452         handle_t *handle = journal_current_handle();
2453
2454         down(&inode->i_sem);
2455         while (towrite > 0) {
2456                 tocopy = sb->s_blocksize - offset < towrite ?
2457                                 sb->s_blocksize - offset : towrite;
2458                 bh = ext3_bread(handle, inode, blk, 1, &err);
2459                 if (!bh)
2460                         goto out;
2461                 if (journal_quota) {
2462                         err = ext3_journal_get_write_access(handle, bh);
2463                         if (err) {
2464                                 brelse(bh);
2465                                 goto out;
2466                         }
2467                 }
2468                 lock_buffer(bh);
2469                 memcpy(bh->b_data+offset, data, tocopy);
2470                 flush_dcache_page(bh->b_page);
2471                 unlock_buffer(bh);
2472                 if (journal_quota)
2473                         err = ext3_journal_dirty_metadata(handle, bh);
2474                 else {
2475                         /* Always do at least ordered writes for quotas */
2476                         err = ext3_journal_dirty_data(handle, bh);
2477                         mark_buffer_dirty(bh);
2478                 }
2479                 brelse(bh);
2480                 if (err)
2481                         goto out;
2482                 offset = 0;
2483                 towrite -= tocopy;
2484                 data += tocopy;
2485                 blk++;
2486         }
2487 out:
2488         if (len == towrite)
2489                 return err;
2490         if (inode->i_size < off+len-towrite) {
2491                 i_size_write(inode, off+len-towrite);
2492                 EXT3_I(inode)->i_disksize = inode->i_size;
2493         }
2494         inode->i_version++;
2495         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2496         ext3_mark_inode_dirty(handle, inode);
2497         up(&inode->i_sem);
2498         return len - towrite;
2499 }
2500
2501 #endif
2502
2503 static struct super_block *ext3_get_sb(struct file_system_type *fs_type,
2504         int flags, const char *dev_name, void *data)
2505 {
2506         return get_sb_bdev(fs_type, flags, dev_name, data, ext3_fill_super);
2507 }
2508
2509 static struct file_system_type ext3_fs_type = {
2510         .owner          = THIS_MODULE,
2511         .name           = "ext3",
2512         .get_sb         = ext3_get_sb,
2513         .kill_sb        = kill_block_super,
2514         .fs_flags       = FS_REQUIRES_DEV,
2515 };
2516
2517 static int __init init_ext3_fs(void)
2518 {
2519         int err = init_ext3_xattr();
2520         if (err)
2521                 return err;
2522         err = init_inodecache();
2523         if (err)
2524                 goto out1;
2525         err = register_filesystem(&ext3_fs_type);
2526         if (err)
2527                 goto out;
2528         return 0;
2529 out:
2530         destroy_inodecache();
2531 out1:
2532         exit_ext3_xattr();
2533         return err;
2534 }
2535
2536 static void __exit exit_ext3_fs(void)
2537 {
2538         unregister_filesystem(&ext3_fs_type);
2539         destroy_inodecache();
2540         exit_ext3_xattr();
2541 }
2542
2543 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
2544 MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
2545 MODULE_LICENSE("GPL");
2546 module_init(init_ext3_fs)
2547 module_exit(exit_ext3_fs)