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 <linux/seq_file.h>
  39
  40 #include <asm/uaccess.h>
  41
  42 #include "xattr.h"
  43 #include "acl.h"
  44 #include "namei.h"
  45
  46 static int ext3_load_journal(struct super_block *, struct ext3_super_block *,
  47                              unsigned long journal_devnum);
  48 static int ext3_create_journal(struct super_block *, struct ext3_super_block *,
  49                                int);
  50 static void ext3_commit_super (struct super_block * sb,
  51                                struct ext3_super_block * es,
  52                                int sync);
  53 static void ext3_mark_recovery_complete(struct super_block * sb,
  54                                         struct ext3_super_block * es);
  55 static void ext3_clear_journal_err(struct super_block * sb,
  56                                    struct ext3_super_block * es);
  57 static int ext3_sync_fs(struct super_block *sb, int wait);
  58 static const char *ext3_decode_error(struct super_block * sb, int errno,
  59                                      char nbuf[16]);
  60 static int ext3_remount (struct super_block * sb, int * flags, char * data);
  61 static int ext3_statfs (struct super_block * sb, struct kstatfs * buf);
  62 static void ext3_unlockfs(struct super_block *sb);
  63 static void ext3_write_super (struct super_block * sb);
  64 static void ext3_write_super_lockfs(struct super_block *sb);
  65
  66 /*
  67  * Wrappers for journal_start/end.
  68  *
  69  * The only special thing we need to do here is to make sure that all
  70  * journal_end calls result in the superblock being marked dirty, so
  71  * that sync() will call the filesystem's write_super callback if
  72  * appropriate.
  73  */
  74 handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks)
  75 {
  76         journal_t *journal;
  77
  78         if (sb->s_flags & MS_RDONLY)
  79                 return ERR_PTR(-EROFS);
  80
  81         /* Special case here: if the journal has aborted behind our
  82          * backs (eg. EIO in the commit thread), then we still need to
  83          * take the FS itself readonly cleanly. */
  84         journal = EXT3_SB(sb)->s_journal;
  85         if (is_journal_aborted(journal)) {
  86                 ext3_abort(sb, __FUNCTION__,
  87                            "Detected aborted journal");
  88                 return ERR_PTR(-EROFS);
  89         }
  90
  91         return journal_start(journal, nblocks);
  92 }
  93
  94 /*
  95  * The only special thing we need to do here is to make sure that all
  96  * journal_stop calls result in the superblock being marked dirty, so
  97  * that sync() will call the filesystem's write_super callback if
  98  * appropriate.
  99  */
 100 int __ext3_journal_stop(const char *where, handle_t *handle)
 101 {
 102         struct super_block *sb;
 103         int err;
 104         int rc;
 105
 106         sb = handle->h_transaction->t_journal->j_private;
 107         err = handle->h_err;
 108         rc = journal_stop(handle);
 109
 110         if (!err)
 111                 err = rc;
 112         if (err)
 113                 __ext3_std_error(sb, where, err);
 114         return err;
 115 }
 116
 117 void ext3_journal_abort_handle(const char *caller, const char *err_fn,
 118                 struct buffer_head *bh, handle_t *handle, int err)
 119 {
 120         char nbuf[16];
 121         const char *errstr = ext3_decode_error(NULL, err, nbuf);
 122
 123         if (bh)
 124                 BUFFER_TRACE(bh, "abort");
 125
 126         if (!handle->h_err)
 127                 handle->h_err = err;
 128
 129         if (is_handle_aborted(handle))
 130                 return;
 131
 132         printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
 133                caller, errstr, err_fn);
 134
 135         journal_abort_handle(handle);
 136 }
 137
 138 /* Deal with the reporting of failure conditions on a filesystem such as
 139  * inconsistencies detected or read IO failures.
 140  *
 141  * On ext2, we can store the error state of the filesystem in the
 142  * superblock.  That is not possible on ext3, because we may have other
 143  * write ordering constraints on the superblock which prevent us from
 144  * writing it out straight away; and given that the journal is about to
 145  * be aborted, we can't rely on the current, or future, transactions to
 146  * write out the superblock safely.
 147  *
 148  * We'll just use the journal_abort() error code to record an error in
 149  * the journal instead.  On recovery, the journal will compain about
 150  * that error until we've noted it down and cleared it.
 151  */
 152
 153 static void ext3_handle_error(struct super_block *sb)
 154 {
 155         struct ext3_super_block *es = EXT3_SB(sb)->s_es;
 156
 157         EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
 158         es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
 159
 160         if (sb->s_flags & MS_RDONLY)
 161                 return;
 162
 163         if (test_opt (sb, ERRORS_RO)) {
 164                 printk (KERN_CRIT "Remounting filesystem read-only\n");
 165                 sb->s_flags |= MS_RDONLY;
 166         } else {
 167                 journal_t *journal = EXT3_SB(sb)->s_journal;
 168
 169                 EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
 170                 if (journal)
 171                         journal_abort(journal, -EIO);
 172         }
 173         if (test_opt(sb, ERRORS_PANIC))
 174                 panic("EXT3-fs (device %s): panic forced after error\n",
 175                         sb->s_id);
 176         ext3_commit_super(sb, es, 1);
 177 }
 178
 179 void ext3_error (struct super_block * sb, const char * function,
 180                  const char * fmt, ...)
 181 {
 182         va_list args;
 183
 184         va_start(args, fmt);
 185         printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
 186         vprintk(fmt, args);
 187         printk("\n");
 188         va_end(args);
 189
 190         ext3_handle_error(sb);
 191 }
 192
 193 static const char *ext3_decode_error(struct super_block * sb, int errno,
 194                                      char nbuf[16])
 195 {
 196         char *errstr = NULL;
 197
 198         switch (errno) {
 199         case -EIO:
 200                 errstr = "IO failure";
 201                 break;
 202         case -ENOMEM:
 203                 errstr = "Out of memory";
 204                 break;
 205         case -EROFS:
 206                 if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT)
 207                         errstr = "Journal has aborted";
 208                 else
 209                         errstr = "Readonly filesystem";
 210                 break;
 211         default:
 212                 /* If the caller passed in an extra buffer for unknown
 213                  * errors, textualise them now.  Else we just return
 214                  * NULL. */
 215                 if (nbuf) {
 216                         /* Check for truncated error codes... */
 217                         if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
 218                                 errstr = nbuf;
 219                 }
 220                 break;
 221         }
 222
 223         return errstr;
 224 }
 225
 226 /* __ext3_std_error decodes expected errors from journaling functions
 227  * automatically and invokes the appropriate error response.  */
 228
 229 void __ext3_std_error (struct super_block * sb, const char * function,
 230                        int errno)
 231 {
 232         char nbuf[16];
 233         const char *errstr;
 234
 235         /* Special case: if the error is EROFS, and we're not already
 236          * inside a transaction, then there's really no point in logging
 237          * an error. */
 238         if (errno == -EROFS && journal_current_handle() == NULL &&
 239             (sb->s_flags & MS_RDONLY))
 240                 return;
 241
 242         errstr = ext3_decode_error(sb, errno, nbuf);
 243         printk (KERN_CRIT "EXT3-fs error (device %s) in %s: %s\n",
 244                 sb->s_id, function, errstr);
 245
 246         ext3_handle_error(sb);
 247 }
 248
 249 /*
 250  * ext3_abort is a much stronger failure handler than ext3_error.  The
 251  * abort function may be used to deal with unrecoverable failures such
 252  * as journal IO errors or ENOMEM at a critical moment in log management.
 253  *
 254  * We unconditionally force the filesystem into an ABORT|READONLY state,
 255  * unless the error response on the fs has been set to panic in which
 256  * case we take the easy way out and panic immediately.
 257  */
 258
 259 void ext3_abort (struct super_block * sb, const char * function,
 260                  const char * fmt, ...)
 261 {
 262         va_list args;
 263
 264         printk (KERN_CRIT "ext3_abort called.\n");
 265
 266         va_start(args, fmt);
 267         printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
 268         vprintk(fmt, args);
 269         printk("\n");
 270         va_end(args);
 271
 272         if (test_opt(sb, ERRORS_PANIC))
 273                 panic("EXT3-fs panic from previous error\n");
 274
 275         if (sb->s_flags & MS_RDONLY)
 276                 return;
 277
 278         printk(KERN_CRIT "Remounting filesystem read-only\n");
 279         EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
 280         sb->s_flags |= MS_RDONLY;
 281         EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
 282         journal_abort(EXT3_SB(sb)->s_journal, -EIO);
 283 }
 284
 285 void ext3_warning (struct super_block * sb, const char * function,
 286                    const char * fmt, ...)
 287 {
 288         va_list args;
 289
 290         va_start(args, fmt);
 291         printk(KERN_WARNING "EXT3-fs warning (device %s): %s: ",
 292                sb->s_id, function);
 293         vprintk(fmt, args);
 294         printk("\n");
 295         va_end(args);
 296 }
 297
 298 void ext3_update_dynamic_rev(struct super_block *sb)
 299 {
 300         struct ext3_super_block *es = EXT3_SB(sb)->s_es;
 301
 302         if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
 303                 return;
 304
 305         ext3_warning(sb, __FUNCTION__,
 306                      "updating to rev %d because of new feature flag, "
 307                      "running e2fsck is recommended",
 308                      EXT3_DYNAMIC_REV);
 309
 310         es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO);
 311         es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE);
 312         es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV);
 313         /* leave es->s_feature_*compat flags alone */
 314         /* es->s_uuid will be set by e2fsck if empty */
 315
 316         /*
 317          * The rest of the superblock fields should be zero, and if not it
 318          * means they are likely already in use, so leave them alone.  We
 319          * can leave it up to e2fsck to clean up any inconsistencies there.
 320          */
 321 }
 322
 323 /*
 324  * Open the external journal device
 325  */
 326 static struct block_device *ext3_blkdev_get(dev_t dev)
 327 {
 328         struct block_device *bdev;
 329         char b[BDEVNAME_SIZE];
 330
 331         bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
 332         if (IS_ERR(bdev))
 333                 goto fail;
 334         return bdev;
 335
 336 fail:
 337         printk(KERN_ERR "EXT3: failed to open journal device %s: %ld\n",
 338                         __bdevname(dev, b), PTR_ERR(bdev));
 339         return NULL;
 340 }
 341
 342 /*
 343  * Release the journal device
 344  */
 345 static int ext3_blkdev_put(struct block_device *bdev)
 346 {
 347         bd_release(bdev);
 348         return blkdev_put(bdev);
 349 }
 350
 351 static int ext3_blkdev_remove(struct ext3_sb_info *sbi)
 352 {
 353         struct block_device *bdev;
 354         int ret = -ENODEV;
 355
 356         bdev = sbi->journal_bdev;
 357         if (bdev) {
 358                 ret = ext3_blkdev_put(bdev);
 359                 sbi->journal_bdev = NULL;
 360         }
 361         return ret;
 362 }
 363
 364 static inline struct inode *orphan_list_entry(struct list_head *l)
 365 {
 366         return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
 367 }
 368
 369 static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
 370 {
 371         struct list_head *l;
 372
 373         printk(KERN_ERR "sb orphan head is %d\n",
 374                le32_to_cpu(sbi->s_es->s_last_orphan));
 375
 376         printk(KERN_ERR "sb_info orphan list:\n");
 377         list_for_each(l, &sbi->s_orphan) {
 378                 struct inode *inode = orphan_list_entry(l);
 379                 printk(KERN_ERR "  "
 380                        "inode %s:%ld at %p: mode %o, nlink %d, next %d\n",
 381                        inode->i_sb->s_id, inode->i_ino, inode,
 382                        inode->i_mode, inode->i_nlink,
 383                        NEXT_ORPHAN(inode));
 384         }
 385 }
 386
 387 static void ext3_put_super (struct super_block * sb)
 388 {
 389         struct ext3_sb_info *sbi = EXT3_SB(sb);
 390         struct ext3_super_block *es = sbi->s_es;
 391         int i;
 392
 393         ext3_xattr_put_super(sb);
 394         journal_destroy(sbi->s_journal);
 395         if (!(sb->s_flags & MS_RDONLY)) {
 396                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
 397                 es->s_state = cpu_to_le16(sbi->s_mount_state);
 398                 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
 399                 mark_buffer_dirty(sbi->s_sbh);
 400                 ext3_commit_super(sb, es, 1);
 401         }
 402
 403         for (i = 0; i < sbi->s_gdb_count; i++)
 404                 brelse(sbi->s_group_desc[i]);
 405         kfree(sbi->s_group_desc);
 406         percpu_counter_destroy(&sbi->s_freeblocks_counter);
 407         percpu_counter_destroy(&sbi->s_freeinodes_counter);
 408         percpu_counter_destroy(&sbi->s_dirs_counter);
 409         brelse(sbi->s_sbh);
 410 #ifdef CONFIG_QUOTA
 411         for (i = 0; i < MAXQUOTAS; i++)
 412                 kfree(sbi->s_qf_names[i]);
 413 #endif
 414
 415         /* Debugging code just in case the in-memory inode orphan list
 416          * isn't empty.  The on-disk one can be non-empty if we've
 417          * detected an error and taken the fs readonly, but the
 418          * in-memory list had better be clean by this point. */
 419         if (!list_empty(&sbi->s_orphan))
 420                 dump_orphan_list(sb, sbi);
 421         J_ASSERT(list_empty(&sbi->s_orphan));
 422
 423         invalidate_bdev(sb->s_bdev, 0);
 424         if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
 425                 /*
 426                  * Invalidate the journal device's buffers.  We don't want them
 427                  * floating about in memory - the physical journal device may
 428                  * hotswapped, and it breaks the `ro-after' testing code.
 429                  */
 430                 sync_blockdev(sbi->journal_bdev);
 431                 invalidate_bdev(sbi->journal_bdev, 0);
 432                 ext3_blkdev_remove(sbi);
 433         }
 434         sb->s_fs_info = NULL;
 435         kfree(sbi);
 436         return;
 437 }
 438
 439 static kmem_cache_t *ext3_inode_cachep;
 440
 441 /*
 442  * Called inside transaction, so use GFP_NOFS
 443  */
 444 static struct inode *ext3_alloc_inode(struct super_block *sb)
 445 {
 446         struct ext3_inode_info *ei;
 447
 448         ei = kmem_cache_alloc(ext3_inode_cachep, SLAB_NOFS);
 449         if (!ei)
 450                 return NULL;
 451 #ifdef CONFIG_EXT3_FS_POSIX_ACL
 452         ei->i_acl = EXT3_ACL_NOT_CACHED;
 453         ei->i_default_acl = EXT3_ACL_NOT_CACHED;
 454 #endif
 455         ei->i_block_alloc_info = NULL;
 456         ei->vfs_inode.i_version = 1;
 457         return &ei->vfs_inode;
 458 }
 459
 460 static void ext3_destroy_inode(struct inode *inode)
 461 {
 462         kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
 463 }
 464
 465 static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
 466 {
 467         struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
 468
 469         if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
 470             SLAB_CTOR_CONSTRUCTOR) {
 471                 INIT_LIST_HEAD(&ei->i_orphan);
 472 #ifdef CONFIG_EXT3_FS_XATTR
 473                 init_rwsem(&ei->xattr_sem);
 474 #endif
 475                 init_MUTEX(&ei->truncate_sem);
 476                 inode_init_once(&ei->vfs_inode);
 477         }
 478 }
 479
 480 static int init_inodecache(void)
 481 {
 482         ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
 483                                              sizeof(struct ext3_inode_info),
 484                                              0, SLAB_RECLAIM_ACCOUNT,
 485                                              init_once, NULL);
 486         if (ext3_inode_cachep == NULL)
 487                 return -ENOMEM;
 488         return 0;
 489 }
 490
 491 static void destroy_inodecache(void)
 492 {
 493         if (kmem_cache_destroy(ext3_inode_cachep))
 494                 printk(KERN_INFO "ext3_inode_cache: not all structures were freed\n");
 495 }
 496
 497 static void ext3_clear_inode(struct inode *inode)
 498 {
 499         struct ext3_block_alloc_info *rsv = EXT3_I(inode)->i_block_alloc_info;
 500 #ifdef CONFIG_EXT3_FS_POSIX_ACL
 501        if (EXT3_I(inode)->i_acl &&
 502            EXT3_I(inode)->i_acl != EXT3_ACL_NOT_CACHED) {
 503                posix_acl_release(EXT3_I(inode)->i_acl);
 504                EXT3_I(inode)->i_acl = EXT3_ACL_NOT_CACHED;
 505        }
 506        if (EXT3_I(inode)->i_default_acl &&
 507            EXT3_I(inode)->i_default_acl != EXT3_ACL_NOT_CACHED) {
 508                posix_acl_release(EXT3_I(inode)->i_default_acl);
 509                EXT3_I(inode)->i_default_acl = EXT3_ACL_NOT_CACHED;
 510        }
 511 #endif
 512         ext3_discard_reservation(inode);
 513         EXT3_I(inode)->i_block_alloc_info = NULL;
 514         kfree(rsv);
 515 }
 516
 517 static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
 518 {
 519 #if defined(CONFIG_QUOTA)
 520         struct ext3_sb_info *sbi = EXT3_SB(sb);
 521
 522         if (sbi->s_jquota_fmt)
 523                 seq_printf(seq, ",jqfmt=%s",
 524                 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0");
 525
 526         if (sbi->s_qf_names[USRQUOTA])
 527                 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
 528
 529         if (sbi->s_qf_names[GRPQUOTA])
 530                 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
 531
 532         if (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA)
 533                 seq_puts(seq, ",usrquota");
 534
 535         if (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)
 536                 seq_puts(seq, ",grpquota");
 537 #endif
 538 }
 539
 540 static int ext3_show_options(struct seq_file *seq, struct vfsmount *vfs)
 541 {
 542         struct super_block *sb = vfs->mnt_sb;
 543
 544         if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA)
 545                 seq_puts(seq, ",data=journal");
 546         else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA)
 547                 seq_puts(seq, ",data=ordered");
 548         else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)
 549                 seq_puts(seq, ",data=writeback");
 550
 551         ext3_show_quota_options(seq, sb);
 552
 553         return 0;
 554 }
 555
 556 #ifdef CONFIG_QUOTA
 557 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
 558 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
 559
 560 static int ext3_dquot_initialize(struct inode *inode, int type);
 561 static int ext3_dquot_drop(struct inode *inode);
 562 static int ext3_write_dquot(struct dquot *dquot);
 563 static int ext3_acquire_dquot(struct dquot *dquot);
 564 static int ext3_release_dquot(struct dquot *dquot);
 565 static int ext3_mark_dquot_dirty(struct dquot *dquot);
 566 static int ext3_write_info(struct super_block *sb, int type);
 567 static int ext3_quota_on(struct super_block *sb, int type, int format_id, char *path);
 568 static int ext3_quota_on_mount(struct super_block *sb, int type);
 569 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
 570                                size_t len, loff_t off);
 571 static ssize_t ext3_quota_write(struct super_block *sb, int type,
 572                                 const char *data, size_t len, loff_t off);
 573
 574 static struct dquot_operations ext3_quota_operations = {
 575         .initialize     = ext3_dquot_initialize,
 576         .drop           = ext3_dquot_drop,
 577         .alloc_space    = dquot_alloc_space,
 578         .alloc_inode    = dquot_alloc_inode,
 579         .free_space     = dquot_free_space,
 580         .free_inode     = dquot_free_inode,
 581         .transfer       = dquot_transfer,
 582         .write_dquot    = ext3_write_dquot,
 583         .acquire_dquot  = ext3_acquire_dquot,
 584         .release_dquot  = ext3_release_dquot,
 585         .mark_dirty     = ext3_mark_dquot_dirty,
 586         .write_info     = ext3_write_info
 587 };
 588
 589 static struct quotactl_ops ext3_qctl_operations = {
 590         .quota_on       = ext3_quota_on,
 591         .quota_off      = vfs_quota_off,
 592         .quota_sync     = vfs_quota_sync,
 593         .get_info       = vfs_get_dqinfo,
 594         .set_info       = vfs_set_dqinfo,
 595         .get_dqblk      = vfs_get_dqblk,
 596         .set_dqblk      = vfs_set_dqblk
 597 };
 598 #endif
 599
 600 static struct super_operations ext3_sops = {
 601         .alloc_inode    = ext3_alloc_inode,
 602         .destroy_inode  = ext3_destroy_inode,
 603         .read_inode     = ext3_read_inode,
 604         .write_inode    = ext3_write_inode,
 605         .dirty_inode    = ext3_dirty_inode,
 606         .delete_inode   = ext3_delete_inode,
 607         .put_super      = ext3_put_super,
 608         .write_super    = ext3_write_super,
 609         .sync_fs        = ext3_sync_fs,
 610         .write_super_lockfs = ext3_write_super_lockfs,
 611         .unlockfs       = ext3_unlockfs,
 612         .statfs         = ext3_statfs,
 613         .remount_fs     = ext3_remount,
 614         .clear_inode    = ext3_clear_inode,
 615         .show_options   = ext3_show_options,
 616 #ifdef CONFIG_QUOTA
 617         .quota_read     = ext3_quota_read,
 618         .quota_write    = ext3_quota_write,
 619 #endif
 620 };
 621
 622 static struct dentry *ext3_get_dentry(struct super_block *sb, void *vobjp)
 623 {
 624         __u32 *objp = vobjp;
 625         unsigned long ino = objp[0];
 626         __u32 generation = objp[1];
 627         struct inode *inode;
 628         struct dentry *result;
 629
 630         if (ino != EXT3_ROOT_INO && ino < EXT3_FIRST_INO(sb))
 631                 return ERR_PTR(-ESTALE);
 632         if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count))
 633                 return ERR_PTR(-ESTALE);
 634
 635         /* iget isn't really right if the inode is currently unallocated!!
 636          * ext3_read_inode currently does appropriate checks, but
 637          * it might be "neater" to call ext3_get_inode first and check
 638          * if the inode is valid.....
 639          */
 640         inode = iget(sb, ino);
 641         if (inode == NULL)
 642                 return ERR_PTR(-ENOMEM);
 643         if (is_bad_inode(inode)
 644             || (generation && inode->i_generation != generation)
 645                 ) {
 646                 /* we didn't find the right inode.. */
 647                 iput(inode);
 648                 return ERR_PTR(-ESTALE);
 649         }
 650         /* now to find a dentry.
 651          * If possible, get a well-connected one
 652          */
 653         result = d_alloc_anon(inode);
 654         if (!result) {
 655                 iput(inode);
 656                 return ERR_PTR(-ENOMEM);
 657         }
 658         return result;
 659 }
 660
 661 static struct export_operations ext3_export_ops = {
 662         .get_parent = ext3_get_parent,
 663         .get_dentry = ext3_get_dentry,
 664 };
 665
 666 enum {
 667         Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
 668         Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
 669         Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
 670         Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
 671         Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh,
 672         Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
 673         Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
 674         Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
 675         Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
 676         Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
 677         Opt_grpquota, Opt_tagxid
 678 };
 679
 680 static match_table_t tokens = {
 681         {Opt_bsd_df, "bsddf"},
 682         {Opt_minix_df, "minixdf"},
 683         {Opt_grpid, "grpid"},
 684         {Opt_grpid, "bsdgroups"},
 685         {Opt_nogrpid, "nogrpid"},
 686         {Opt_nogrpid, "sysvgroups"},
 687         {Opt_resgid, "resgid=%u"},
 688         {Opt_resuid, "resuid=%u"},
 689         {Opt_sb, "sb=%u"},
 690         {Opt_err_cont, "errors=continue"},
 691         {Opt_err_panic, "errors=panic"},
 692         {Opt_err_ro, "errors=remount-ro"},
 693         {Opt_nouid32, "nouid32"},
 694         {Opt_nocheck, "nocheck"},
 695         {Opt_nocheck, "check=none"},
 696         {Opt_debug, "debug"},
 697         {Opt_oldalloc, "oldalloc"},
 698         {Opt_orlov, "orlov"},
 699         {Opt_user_xattr, "user_xattr"},
 700         {Opt_nouser_xattr, "nouser_xattr"},
 701         {Opt_acl, "acl"},
 702         {Opt_noacl, "noacl"},
 703         {Opt_reservation, "reservation"},
 704         {Opt_noreservation, "noreservation"},
 705         {Opt_noload, "noload"},
 706         {Opt_nobh, "nobh"},
 707         {Opt_commit, "commit=%u"},
 708         {Opt_journal_update, "journal=update"},
 709         {Opt_journal_inum, "journal=%u"},
 710         {Opt_journal_dev, "journal_dev=%u"},
 711         {Opt_abort, "abort"},
 712         {Opt_data_journal, "data=journal"},
 713         {Opt_data_ordered, "data=ordered"},
 714         {Opt_data_writeback, "data=writeback"},
 715         {Opt_offusrjquota, "usrjquota="},
 716         {Opt_usrjquota, "usrjquota=%s"},
 717         {Opt_offgrpjquota, "grpjquota="},
 718         {Opt_grpjquota, "grpjquota=%s"},
 719         {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
 720         {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
 721         {Opt_grpquota, "grpquota"},
 722         {Opt_noquota, "noquota"},
 723         {Opt_quota, "quota"},
 724         {Opt_usrquota, "usrquota"},
 725         {Opt_barrier, "barrier=%u"},
 726         {Opt_tagxid, "tagxid"},
 727         {Opt_err, NULL},
 728         {Opt_resize, "resize"},
 729 };
 730
 731 static unsigned long get_sb_block(void **data)
 732 {
 733         unsigned long   sb_block;
 734         char            *options = (char *) *data;
 735
 736         if (!options || strncmp(options, "sb=", 3) != 0)
 737                 return 1;       /* Default location */
 738         options += 3;
 739         sb_block = simple_strtoul(options, &options, 0);
 740         if (*options && *options != ',') {
 741                 printk("EXT3-fs: Invalid sb specification: %s\n",
 742                        (char *) *data);
 743                 return 1;
 744         }
 745         if (*options == ',')
 746                 options++;
 747         *data = (void *) options;
 748         return sb_block;
 749 }
 750
 751 static int parse_options (char *options, struct super_block *sb,
 752                           unsigned long *inum, unsigned long *journal_devnum,
 753                           unsigned long *n_blocks_count, int is_remount)
 754 {
 755         struct ext3_sb_info *sbi = EXT3_SB(sb);
 756         char * p;
 757         substring_t args[MAX_OPT_ARGS];
 758         int data_opt = 0;
 759         int option;
 760 #ifdef CONFIG_QUOTA
 761         int qtype;
 762         char *qname;
 763 #endif
 764
 765         if (!options)
 766                 return 1;
 767
 768         while ((p = strsep (&options, ",")) != NULL) {
 769                 int token;
 770                 if (!*p)
 771                         continue;
 772
 773                 token = match_token(p, tokens, args);
 774                 switch (token) {
 775                 case Opt_bsd_df:
 776                         clear_opt (sbi->s_mount_opt, MINIX_DF);
 777                         break;
 778                 case Opt_minix_df:
 779                         set_opt (sbi->s_mount_opt, MINIX_DF);
 780                         break;
 781                 case Opt_grpid:
 782                         set_opt (sbi->s_mount_opt, GRPID);
 783                         break;
 784                 case Opt_nogrpid:
 785                         clear_opt (sbi->s_mount_opt, GRPID);
 786                         break;
 787                 case Opt_resuid:
 788                         if (match_int(&args[0], &option))
 789                                 return 0;
 790                         sbi->s_resuid = option;
 791                         break;
 792                 case Opt_resgid:
 793                         if (match_int(&args[0], &option))
 794                                 return 0;
 795                         sbi->s_resgid = option;
 796                         break;
 797                 case Opt_sb:
 798                         /* handled by get_sb_block() instead of here */
 799                         /* *sb_block = match_int(&args[0]); */
 800                         break;
 801                 case Opt_err_panic:
 802                         clear_opt (sbi->s_mount_opt, ERRORS_CONT);
 803                         clear_opt (sbi->s_mount_opt, ERRORS_RO);
 804                         set_opt (sbi->s_mount_opt, ERRORS_PANIC);
 805                         break;
 806                 case Opt_err_ro:
 807                         clear_opt (sbi->s_mount_opt, ERRORS_CONT);
 808                         clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
 809                         set_opt (sbi->s_mount_opt, ERRORS_RO);
 810                         break;
 811                 case Opt_err_cont:
 812                         clear_opt (sbi->s_mount_opt, ERRORS_RO);
 813                         clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
 814                         set_opt (sbi->s_mount_opt, ERRORS_CONT);
 815                         break;
 816                 case Opt_nouid32:
 817                         set_opt (sbi->s_mount_opt, NO_UID32);
 818                         break;
 819 #ifndef CONFIG_INOXID_NONE
 820                 case Opt_tagxid:
 821                         set_opt (sbi->s_mount_opt, TAGXID);
 822                         break;
 823 #endif
 824                 case Opt_nocheck:
 825                         clear_opt (sbi->s_mount_opt, CHECK);
 826                         break;
 827                 case Opt_debug:
 828                         set_opt (sbi->s_mount_opt, DEBUG);
 829                         break;
 830                 case Opt_oldalloc:
 831                         set_opt (sbi->s_mount_opt, OLDALLOC);
 832                         break;
 833                 case Opt_orlov:
 834                         clear_opt (sbi->s_mount_opt, OLDALLOC);
 835                         break;
 836 #ifdef CONFIG_EXT3_FS_XATTR
 837                 case Opt_user_xattr:
 838                         set_opt (sbi->s_mount_opt, XATTR_USER);
 839                         break;
 840                 case Opt_nouser_xattr:
 841                         clear_opt (sbi->s_mount_opt, XATTR_USER);
 842                         break;
 843 #else
 844                 case Opt_user_xattr:
 845                 case Opt_nouser_xattr:
 846                         printk("EXT3 (no)user_xattr options not supported\n");
 847                         break;
 848 #endif
 849 #ifdef CONFIG_EXT3_FS_POSIX_ACL
 850                 case Opt_acl:
 851                         set_opt(sbi->s_mount_opt, POSIX_ACL);
 852                         break;
 853                 case Opt_noacl:
 854                         clear_opt(sbi->s_mount_opt, POSIX_ACL);
 855                         break;
 856 #else
 857                 case Opt_acl:
 858                 case Opt_noacl:
 859                         printk("EXT3 (no)acl options not supported\n");
 860                         break;
 861 #endif
 862                 case Opt_reservation:
 863                         set_opt(sbi->s_mount_opt, RESERVATION);
 864                         break;
 865                 case Opt_noreservation:
 866                         clear_opt(sbi->s_mount_opt, RESERVATION);
 867                         break;
 868                 case Opt_journal_update:
 869                         /* @@@ FIXME */
 870                         /* Eventually we will want to be able to create
 871                            a journal file here.  For now, only allow the
 872                            user to specify an existing inode to be the
 873                            journal file. */
 874                         if (is_remount) {
 875                                 printk(KERN_ERR "EXT3-fs: cannot specify "
 876                                        "journal on remount\n");
 877                                 return 0;
 878                         }
 879                         set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
 880                         break;
 881                 case Opt_journal_inum:
 882                         if (is_remount) {
 883                                 printk(KERN_ERR "EXT3-fs: cannot specify "
 884                                        "journal on remount\n");
 885                                 return 0;
 886                         }
 887                         if (match_int(&args[0], &option))
 888                                 return 0;
 889                         *inum = option;
 890                         break;
 891                 case Opt_journal_dev:
 892                         if (is_remount) {
 893                                 printk(KERN_ERR "EXT3-fs: cannot specify "
 894                                        "journal on remount\n");
 895                                 return 0;
 896                         }
 897                         if (match_int(&args[0], &option))
 898                                 return 0;
 899                         *journal_devnum = option;
 900                         break;
 901                 case Opt_noload:
 902                         set_opt (sbi->s_mount_opt, NOLOAD);
 903                         break;
 904                 case Opt_commit:
 905                         if (match_int(&args[0], &option))
 906                                 return 0;
 907                         if (option < 0)
 908                                 return 0;
 909                         if (option == 0)
 910                                 option = JBD_DEFAULT_MAX_COMMIT_AGE;
 911                         sbi->s_commit_interval = HZ * option;
 912                         break;
 913                 case Opt_data_journal:
 914                         data_opt = EXT3_MOUNT_JOURNAL_DATA;
 915                         goto datacheck;
 916                 case Opt_data_ordered:
 917                         data_opt = EXT3_MOUNT_ORDERED_DATA;
 918                         goto datacheck;
 919                 case Opt_data_writeback:
 920                         data_opt = EXT3_MOUNT_WRITEBACK_DATA;
 921                 datacheck:
 922                         if (is_remount) {
 923                                 if ((sbi->s_mount_opt & EXT3_MOUNT_DATA_FLAGS)
 924                                                 != data_opt) {
 925                                         printk(KERN_ERR
 926                                                 "EXT3-fs: cannot change data "
 927                                                 "mode on remount\n");
 928                                         return 0;
 929                                 }
 930                         } else {
 931                                 sbi->s_mount_opt &= ~EXT3_MOUNT_DATA_FLAGS;
 932                                 sbi->s_mount_opt |= data_opt;
 933                         }
 934                         break;
 935 #ifdef CONFIG_QUOTA
 936                 case Opt_usrjquota:
 937                         qtype = USRQUOTA;
 938                         goto set_qf_name;
 939                 case Opt_grpjquota:
 940                         qtype = GRPQUOTA;
 941 set_qf_name:
 942                         if (sb_any_quota_enabled(sb)) {
 943                                 printk(KERN_ERR
 944                                         "EXT3-fs: Cannot change journalled "
 945                                         "quota options when quota turned on.\n");
 946                                 return 0;
 947                         }
 948                         qname = match_strdup(&args[0]);
 949                         if (!qname) {
 950                                 printk(KERN_ERR
 951                                         "EXT3-fs: not enough memory for "
 952                                         "storing quotafile name.\n");
 953                                 return 0;
 954                         }
 955                         if (sbi->s_qf_names[qtype] &&
 956                             strcmp(sbi->s_qf_names[qtype], qname)) {
 957                                 printk(KERN_ERR
 958                                         "EXT3-fs: %s quota file already "
 959                                         "specified.\n", QTYPE2NAME(qtype));
 960                                 kfree(qname);
 961                                 return 0;
 962                         }
 963                         sbi->s_qf_names[qtype] = qname;
 964                         if (strchr(sbi->s_qf_names[qtype], '/')) {
 965                                 printk(KERN_ERR
 966                                         "EXT3-fs: quotafile must be on "
 967                                         "filesystem root.\n");
 968                                 kfree(sbi->s_qf_names[qtype]);
 969                                 sbi->s_qf_names[qtype] = NULL;
 970                                 return 0;
 971                         }
 972                         set_opt(sbi->s_mount_opt, QUOTA);
 973                         break;
 974                 case Opt_offusrjquota:
 975                         qtype = USRQUOTA;
 976                         goto clear_qf_name;
 977                 case Opt_offgrpjquota:
 978                         qtype = GRPQUOTA;
 979 clear_qf_name:
 980                         if (sb_any_quota_enabled(sb)) {
 981                                 printk(KERN_ERR "EXT3-fs: Cannot change "
 982                                         "journalled quota options when "
 983                                         "quota turned on.\n");
 984                                 return 0;
 985                         }
 986                         /*
 987                          * The space will be released later when all options
 988                          * are confirmed to be correct
 989                          */
 990                         sbi->s_qf_names[qtype] = NULL;
 991                         break;
 992                 case Opt_jqfmt_vfsold:
 993                         sbi->s_jquota_fmt = QFMT_VFS_OLD;
 994                         break;
 995                 case Opt_jqfmt_vfsv0:
 996                         sbi->s_jquota_fmt = QFMT_VFS_V0;
 997                         break;
 998                 case Opt_quota:
 999                 case Opt_usrquota:
1000                         set_opt(sbi->s_mount_opt, QUOTA);
1001                         set_opt(sbi->s_mount_opt, USRQUOTA);
1002                         break;
1003                 case Opt_grpquota:
1004                         set_opt(sbi->s_mount_opt, QUOTA);
1005                         set_opt(sbi->s_mount_opt, GRPQUOTA);
1006                         break;
1007                 case Opt_noquota:
1008                         if (sb_any_quota_enabled(sb)) {
1009                                 printk(KERN_ERR "EXT3-fs: Cannot change quota "
1010                                         "options when quota turned on.\n");
1011                                 return 0;
1012                         }
1013                         clear_opt(sbi->s_mount_opt, QUOTA);
1014                         clear_opt(sbi->s_mount_opt, USRQUOTA);
1015                         clear_opt(sbi->s_mount_opt, GRPQUOTA);
1016                         break;
1017 #else
1018                 case Opt_quota:
1019                 case Opt_usrquota:
1020                 case Opt_grpquota:
1021                 case Opt_usrjquota:
1022                 case Opt_grpjquota:
1023                 case Opt_offusrjquota:
1024                 case Opt_offgrpjquota:
1025                 case Opt_jqfmt_vfsold:
1026                 case Opt_jqfmt_vfsv0:
1027                         printk(KERN_ERR
1028                                 "EXT3-fs: journalled quota options not "
1029                                 "supported.\n");
1030                         break;
1031                 case Opt_noquota:
1032                         break;
1033 #endif
1034                 case Opt_abort:
1035                         set_opt(sbi->s_mount_opt, ABORT);
1036                         break;
1037                 case Opt_barrier:
1038                         if (match_int(&args[0], &option))
1039                                 return 0;
1040                         if (option)
1041                                 set_opt(sbi->s_mount_opt, BARRIER);
1042                         else
1043                                 clear_opt(sbi->s_mount_opt, BARRIER);
1044                         break;
1045                 case Opt_ignore:
1046                         break;
1047                 case Opt_resize:
1048                         if (!is_remount) {
1049                                 printk("EXT3-fs: resize option only available "
1050                                         "for remount\n");
1051                                 return 0;
1052                         }
1053                         if (match_int(&args[0], &option) != 0)
1054                                 return 0;
1055                         *n_blocks_count = option;
1056                         break;
1057                 case Opt_nobh:
1058                         set_opt(sbi->s_mount_opt, NOBH);
1059                         break;
1060                 default:
1061                         printk (KERN_ERR
1062                                 "EXT3-fs: Unrecognized mount option \"%s\" "
1063                                 "or missing value\n", p);
1064                         return 0;
1065                 }
1066         }
1067 #ifdef CONFIG_QUOTA
1068         if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1069                 if ((sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA) &&
1070                      sbi->s_qf_names[USRQUOTA])
1071                         clear_opt(sbi->s_mount_opt, USRQUOTA);
1072
1073                 if ((sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA) &&
1074                      sbi->s_qf_names[GRPQUOTA])
1075                         clear_opt(sbi->s_mount_opt, GRPQUOTA);
1076
1077                 if ((sbi->s_qf_names[USRQUOTA] &&
1078                                 (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)) ||
1079                     (sbi->s_qf_names[GRPQUOTA] &&
1080                                 (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA))) {
1081                         printk(KERN_ERR "EXT3-fs: old and new quota "
1082                                         "format mixing.\n");
1083                         return 0;
1084                 }
1085
1086                 if (!sbi->s_jquota_fmt) {
1087                         printk(KERN_ERR "EXT3-fs: journalled quota format "
1088                                         "not specified.\n");
1089                         return 0;
1090                 }
1091         } else {
1092                 if (sbi->s_jquota_fmt) {
1093                         printk(KERN_ERR "EXT3-fs: journalled quota format "
1094                                         "specified with no journalling "
1095                                         "enabled.\n");
1096                         return 0;
1097                 }
1098         }
1099 #endif
1100         return 1;
1101 }
1102
1103 static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1104                             int read_only)
1105 {
1106         struct ext3_sb_info *sbi = EXT3_SB(sb);
1107         int res = 0;
1108
1109         if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
1110                 printk (KERN_ERR "EXT3-fs warning: revision level too high, "
1111                         "forcing read-only mode\n");
1112                 res = MS_RDONLY;
1113         }
1114         if (read_only)
1115                 return res;
1116         if (!(sbi->s_mount_state & EXT3_VALID_FS))
1117                 printk (KERN_WARNING "EXT3-fs warning: mounting unchecked fs, "
1118                         "running e2fsck is recommended\n");
1119         else if ((sbi->s_mount_state & EXT3_ERROR_FS))
1120                 printk (KERN_WARNING
1121                         "EXT3-fs warning: mounting fs with errors, "
1122                         "running e2fsck is recommended\n");
1123         else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1124                  le16_to_cpu(es->s_mnt_count) >=
1125                  (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1126                 printk (KERN_WARNING
1127                         "EXT3-fs warning: maximal mount count reached, "
1128                         "running e2fsck is recommended\n");
1129         else if (le32_to_cpu(es->s_checkinterval) &&
1130                 (le32_to_cpu(es->s_lastcheck) +
1131                         le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1132                 printk (KERN_WARNING
1133                         "EXT3-fs warning: checktime reached, "
1134                         "running e2fsck is recommended\n");
1135 #if 0
1136                 /* @@@ We _will_ want to clear the valid bit if we find
1137                    inconsistencies, to force a fsck at reboot.  But for
1138                    a plain journaled filesystem we can keep it set as
1139                    valid forever! :) */
1140         es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & ~EXT3_VALID_FS);
1141 #endif
1142         if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1143                 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
1144         es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1);
1145         es->s_mtime = cpu_to_le32(get_seconds());
1146         ext3_update_dynamic_rev(sb);
1147         EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1148
1149         ext3_commit_super(sb, es, 1);
1150         if (test_opt(sb, DEBUG))
1151                 printk(KERN_INFO "[EXT3 FS bs=%lu, gc=%lu, "
1152                                 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1153                         sb->s_blocksize,
1154                         sbi->s_groups_count,
1155                         EXT3_BLOCKS_PER_GROUP(sb),
1156                         EXT3_INODES_PER_GROUP(sb),
1157                         sbi->s_mount_opt);
1158
1159         printk(KERN_INFO "EXT3 FS on %s, ", sb->s_id);
1160         if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1161                 char b[BDEVNAME_SIZE];
1162
1163                 printk("external journal on %s\n",
1164                         bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1165         } else {
1166                 printk("internal journal\n");
1167         }
1168         return res;
1169 }
1170
1171 /* Called at mount-time, super-block is locked */
1172 static int ext3_check_descriptors (struct super_block * sb)
1173 {
1174         struct ext3_sb_info *sbi = EXT3_SB(sb);
1175         unsigned long block = le32_to_cpu(sbi->s_es->s_first_data_block);
1176         struct ext3_group_desc * gdp = NULL;
1177         int desc_block = 0;
1178         int i;
1179
1180         ext3_debug ("Checking group descriptors");
1181
1182         for (i = 0; i < sbi->s_groups_count; i++)
1183         {
1184                 if ((i % EXT3_DESC_PER_BLOCK(sb)) == 0)
1185                         gdp = (struct ext3_group_desc *)
1186                                         sbi->s_group_desc[desc_block++]->b_data;
1187                 if (le32_to_cpu(gdp->bg_block_bitmap) < block ||
1188                     le32_to_cpu(gdp->bg_block_bitmap) >=
1189                                 block + EXT3_BLOCKS_PER_GROUP(sb))
1190                 {
1191                         ext3_error (sb, "ext3_check_descriptors",
1192                                     "Block bitmap for group %d"
1193                                     " not in group (block %lu)!",
1194                                     i, (unsigned long)
1195                                         le32_to_cpu(gdp->bg_block_bitmap));
1196                         return 0;
1197                 }
1198                 if (le32_to_cpu(gdp->bg_inode_bitmap) < block ||
1199                     le32_to_cpu(gdp->bg_inode_bitmap) >=
1200                                 block + EXT3_BLOCKS_PER_GROUP(sb))
1201                 {
1202                         ext3_error (sb, "ext3_check_descriptors",
1203                                     "Inode bitmap for group %d"
1204                                     " not in group (block %lu)!",
1205                                     i, (unsigned long)
1206                                         le32_to_cpu(gdp->bg_inode_bitmap));
1207                         return 0;
1208                 }
1209                 if (le32_to_cpu(gdp->bg_inode_table) < block ||
1210                     le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group >=
1211                     block + EXT3_BLOCKS_PER_GROUP(sb))
1212                 {
1213                         ext3_error (sb, "ext3_check_descriptors",
1214                                     "Inode table for group %d"
1215                                     " not in group (block %lu)!",
1216                                     i, (unsigned long)
1217                                         le32_to_cpu(gdp->bg_inode_table));
1218                         return 0;
1219                 }
1220                 block += EXT3_BLOCKS_PER_GROUP(sb);
1221                 gdp++;
1222         }
1223
1224         sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1225         sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1226         return 1;
1227 }
1228
1229
1230 /* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1231  * the superblock) which were deleted from all directories, but held open by
1232  * a process at the time of a crash.  We walk the list and try to delete these
1233  * inodes at recovery time (only with a read-write filesystem).
1234  *
1235  * In order to keep the orphan inode chain consistent during traversal (in
1236  * case of crash during recovery), we link each inode into the superblock
1237  * orphan list_head and handle it the same way as an inode deletion during
1238  * normal operation (which journals the operations for us).
1239  *
1240  * We only do an iget() and an iput() on each inode, which is very safe if we
1241  * accidentally point at an in-use or already deleted inode.  The worst that
1242  * can happen in this case is that we get a "bit already cleared" message from
1243  * ext3_free_inode().  The only reason we would point at a wrong inode is if
1244  * e2fsck was run on this filesystem, and it must have already done the orphan
1245  * inode cleanup for us, so we can safely abort without any further action.
1246  */
1247 static void ext3_orphan_cleanup (struct super_block * sb,
1248                                  struct ext3_super_block * es)
1249 {
1250         unsigned int s_flags = sb->s_flags;
1251         int nr_orphans = 0, nr_truncates = 0;
1252 #ifdef CONFIG_QUOTA
1253         int i;
1254 #endif
1255         if (!es->s_last_orphan) {
1256                 jbd_debug(4, "no orphan inodes to clean up\n");
1257                 return;
1258         }
1259
1260         if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1261                 if (es->s_last_orphan)
1262                         jbd_debug(1, "Errors on filesystem, "
1263                                   "clearing orphan list.\n");
1264                 es->s_last_orphan = 0;
1265                 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1266                 return;
1267         }
1268
1269         if (s_flags & MS_RDONLY) {
1270                 printk(KERN_INFO "EXT3-fs: %s: orphan cleanup on readonly fs\n",
1271                        sb->s_id);
1272                 sb->s_flags &= ~MS_RDONLY;
1273         }
1274 #ifdef CONFIG_QUOTA
1275         /* Needed for iput() to work correctly and not trash data */
1276         sb->s_flags |= MS_ACTIVE;
1277         /* Turn on quotas so that they are updated correctly */
1278         for (i = 0; i < MAXQUOTAS; i++) {
1279                 if (EXT3_SB(sb)->s_qf_names[i]) {
1280                         int ret = ext3_quota_on_mount(sb, i);
1281                         if (ret < 0)
1282                                 printk(KERN_ERR
1283                                         "EXT3-fs: Cannot turn on journalled "
1284                                         "quota: error %d\n", ret);
1285                 }
1286         }
1287 #endif
1288
1289         while (es->s_last_orphan) {
1290                 struct inode *inode;
1291
1292                 if (!(inode =
1293                       ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan)))) {
1294                         es->s_last_orphan = 0;
1295                         break;
1296                 }
1297
1298                 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1299                 DQUOT_INIT(inode);
1300                 if (inode->i_nlink) {
1301                         printk(KERN_DEBUG
1302                                 "%s: truncating inode %ld to %Ld bytes\n",
1303                                 __FUNCTION__, inode->i_ino, inode->i_size);
1304                         jbd_debug(2, "truncating inode %ld to %Ld bytes\n",
1305                                   inode->i_ino, inode->i_size);
1306                         ext3_truncate(inode);
1307                         nr_truncates++;
1308                 } else {
1309                         printk(KERN_DEBUG
1310                                 "%s: deleting unreferenced inode %ld\n",
1311                                 __FUNCTION__, inode->i_ino);
1312                         jbd_debug(2, "deleting unreferenced inode %ld\n",
1313                                   inode->i_ino);
1314                         nr_orphans++;
1315                 }
1316                 iput(inode);  /* The delete magic happens here! */
1317         }
1318
1319 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1320
1321         if (nr_orphans)
1322                 printk(KERN_INFO "EXT3-fs: %s: %d orphan inode%s deleted\n",
1323                        sb->s_id, PLURAL(nr_orphans));
1324         if (nr_truncates)
1325                 printk(KERN_INFO "EXT3-fs: %s: %d truncate%s cleaned up\n",
1326                        sb->s_id, PLURAL(nr_truncates));
1327 #ifdef CONFIG_QUOTA
1328         /* Turn quotas off */
1329         for (i = 0; i < MAXQUOTAS; i++) {
1330                 if (sb_dqopt(sb)->files[i])
1331                         vfs_quota_off(sb, i);
1332         }
1333 #endif
1334         sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1335 }
1336
1337 #define log2(n) ffz(~(n))
1338
1339 /*
1340  * Maximal file size.  There is a direct, and {,double-,triple-}indirect
1341  * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1342  * We need to be 1 filesystem block less than the 2^32 sector limit.
1343  */
1344 static loff_t ext3_max_size(int bits)
1345 {
1346         loff_t res = EXT3_NDIR_BLOCKS;
1347         /* This constant is calculated to be the largest file size for a
1348          * dense, 4k-blocksize file such that the total number of
1349          * sectors in the file, including data and all indirect blocks,
1350          * does not exceed 2^32. */
1351         const loff_t upper_limit = 0x1ff7fffd000LL;
1352
1353         res += 1LL << (bits-2);
1354         res += 1LL << (2*(bits-2));
1355         res += 1LL << (3*(bits-2));
1356         res <<= bits;
1357         if (res > upper_limit)
1358                 res = upper_limit;
1359         return res;
1360 }
1361
1362 static unsigned long descriptor_loc(struct super_block *sb,
1363                                     unsigned long logic_sb_block,
1364                                     int nr)
1365 {
1366         struct ext3_sb_info *sbi = EXT3_SB(sb);
1367         unsigned long bg, first_data_block, first_meta_bg;
1368         int has_super = 0;
1369
1370         first_data_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1371         first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1372
1373         if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1374             nr < first_meta_bg)
1375                 return (logic_sb_block + nr + 1);
1376         bg = sbi->s_desc_per_block * nr;
1377         if (ext3_bg_has_super(sb, bg))
1378                 has_super = 1;
1379         return (first_data_block + has_super + (bg * sbi->s_blocks_per_group));
1380 }
1381
1382
1383 static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1384 {
1385         struct buffer_head * bh;
1386         struct ext3_super_block *es = NULL;
1387         struct ext3_sb_info *sbi;
1388         unsigned long block;
1389         unsigned long sb_block = get_sb_block(&data);
1390         unsigned long logic_sb_block;
1391         unsigned long offset = 0;
1392         unsigned long journal_inum = 0;
1393         unsigned long journal_devnum = 0;
1394         unsigned long def_mount_opts;
1395         struct inode *root;
1396         int blocksize;
1397         int hblock;
1398         int db_count;
1399         int i;
1400         int needs_recovery;
1401         __le32 features;
1402
1403         sbi = kmalloc(sizeof(*sbi), GFP_KERNEL);
1404         if (!sbi)
1405                 return -ENOMEM;
1406         sb->s_fs_info = sbi;
1407         memset(sbi, 0, sizeof(*sbi));
1408         sbi->s_mount_opt = 0;
1409         sbi->s_resuid = EXT3_DEF_RESUID;
1410         sbi->s_resgid = EXT3_DEF_RESGID;
1411
1412         unlock_kernel();
1413
1414         blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1415         if (!blocksize) {
1416                 printk(KERN_ERR "EXT3-fs: unable to set blocksize\n");
1417                 goto out_fail;
1418         }
1419
1420         /*
1421          * The ext3 superblock will not be buffer aligned for other than 1kB
1422          * block sizes.  We need to calculate the offset from buffer start.
1423          */
1424         if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1425                 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1426                 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1427         } else {
1428                 logic_sb_block = sb_block;
1429         }
1430
1431         if (!(bh = sb_bread(sb, logic_sb_block))) {
1432                 printk (KERN_ERR "EXT3-fs: unable to read superblock\n");
1433                 goto out_fail;
1434         }
1435         /*
1436          * Note: s_es must be initialized as soon as possible because
1437          *       some ext3 macro-instructions depend on its value
1438          */
1439         es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1440         sbi->s_es = es;
1441         sb->s_magic = le16_to_cpu(es->s_magic);
1442         if (sb->s_magic != EXT3_SUPER_MAGIC)
1443                 goto cantfind_ext3;
1444
1445         /* Set defaults before we parse the mount options */
1446         def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1447         if (def_mount_opts & EXT3_DEFM_DEBUG)
1448                 set_opt(sbi->s_mount_opt, DEBUG);
1449         if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1450                 set_opt(sbi->s_mount_opt, GRPID);
1451         if (def_mount_opts & EXT3_DEFM_UID16)
1452                 set_opt(sbi->s_mount_opt, NO_UID32);
1453         if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1454                 set_opt(sbi->s_mount_opt, XATTR_USER);
1455         if (def_mount_opts & EXT3_DEFM_ACL)
1456                 set_opt(sbi->s_mount_opt, POSIX_ACL);
1457         if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1458                 sbi->s_mount_opt |= EXT3_MOUNT_JOURNAL_DATA;
1459         else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1460                 sbi->s_mount_opt |= EXT3_MOUNT_ORDERED_DATA;
1461         else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1462                 sbi->s_mount_opt |= EXT3_MOUNT_WRITEBACK_DATA;
1463
1464         if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1465                 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1466         else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_RO)
1467                 set_opt(sbi->s_mount_opt, ERRORS_RO);
1468
1469         sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1470         sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1471
1472         set_opt(sbi->s_mount_opt, RESERVATION);
1473
1474         if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1475                             NULL, 0))
1476                 goto failed_mount;
1477
1478         if (EXT3_SB(sb)->s_mount_opt & EXT3_MOUNT_TAGXID)
1479                 sb->s_flags |= MS_TAGXID;
1480
1481         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1482                 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1483
1484         if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1485             (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1486              EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1487              EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1488                 printk(KERN_WARNING
1489                        "EXT3-fs warning: feature flags set on rev 0 fs, "
1490                        "running e2fsck is recommended\n");
1491         /*
1492          * Check feature flags regardless of the revision level, since we
1493          * previously didn't change the revision level when setting the flags,
1494          * so there is a chance incompat flags are set on a rev 0 filesystem.
1495          */
1496         features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1497         if (features) {
1498                 printk(KERN_ERR "EXT3-fs: %s: couldn't mount because of "
1499                        "unsupported optional features (%x).\n",
1500                        sb->s_id, le32_to_cpu(features));
1501                 goto failed_mount;
1502         }
1503         features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1504         if (!(sb->s_flags & MS_RDONLY) && features) {
1505                 printk(KERN_ERR "EXT3-fs: %s: couldn't mount RDWR because of "
1506                        "unsupported optional features (%x).\n",
1507                        sb->s_id, le32_to_cpu(features));
1508                 goto failed_mount;
1509         }
1510         blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1511
1512         if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1513             blocksize > EXT3_MAX_BLOCK_SIZE) {
1514                 printk(KERN_ERR
1515                        "EXT3-fs: Unsupported filesystem blocksize %d on %s.\n",
1516                        blocksize, sb->s_id);
1517                 goto failed_mount;
1518         }
1519
1520         hblock = bdev_hardsect_size(sb->s_bdev);
1521         if (sb->s_blocksize != blocksize) {
1522                 /*
1523                  * Make sure the blocksize for the filesystem is larger
1524                  * than the hardware sectorsize for the machine.
1525                  */
1526                 if (blocksize < hblock) {
1527                         printk(KERN_ERR "EXT3-fs: blocksize %d too small for "
1528                                "device blocksize %d.\n", blocksize, hblock);
1529                         goto failed_mount;
1530                 }
1531
1532                 brelse (bh);
1533                 sb_set_blocksize(sb, blocksize);
1534                 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1535                 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1536                 bh = sb_bread(sb, logic_sb_block);
1537                 if (!bh) {
1538                         printk(KERN_ERR
1539                                "EXT3-fs: Can't read superblock on 2nd try.\n");
1540                         goto failed_mount;
1541                 }
1542                 es = (struct ext3_super_block *)(((char *)bh->b_data) + offset);
1543                 sbi->s_es = es;
1544                 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
1545                         printk (KERN_ERR
1546                                 "EXT3-fs: Magic mismatch, very weird !\n");
1547                         goto failed_mount;
1548                 }
1549         }
1550
1551         sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1552
1553         if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1554                 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1555                 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1556         } else {
1557                 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1558                 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1559                 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
1560                     (sbi->s_inode_size & (sbi->s_inode_size - 1)) ||
1561                     (sbi->s_inode_size > blocksize)) {
1562                         printk (KERN_ERR
1563                                 "EXT3-fs: unsupported inode size: %d\n",
1564                                 sbi->s_inode_size);
1565                         goto failed_mount;
1566                 }
1567         }
1568         sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1569                                    le32_to_cpu(es->s_log_frag_size);
1570         if (blocksize != sbi->s_frag_size) {
1571                 printk(KERN_ERR
1572                        "EXT3-fs: fragsize %lu != blocksize %u (unsupported)\n",
1573                        sbi->s_frag_size, blocksize);
1574                 goto failed_mount;
1575         }
1576         sbi->s_frags_per_block = 1;
1577         sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1578         sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1579         sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1580         if (EXT3_INODE_SIZE(sb) == 0)
1581                 goto cantfind_ext3;
1582         sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1583         if (sbi->s_inodes_per_block == 0)
1584                 goto cantfind_ext3;
1585         sbi->s_itb_per_group = sbi->s_inodes_per_group /
1586                                         sbi->s_inodes_per_block;
1587         sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1588         sbi->s_sbh = bh;
1589         sbi->s_mount_state = le16_to_cpu(es->s_state);
1590         sbi->s_addr_per_block_bits = log2(EXT3_ADDR_PER_BLOCK(sb));
1591         sbi->s_desc_per_block_bits = log2(EXT3_DESC_PER_BLOCK(sb));
1592         for (i=0; i < 4; i++)
1593                 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1594         sbi->s_def_hash_version = es->s_def_hash_version;
1595
1596         if (sbi->s_blocks_per_group > blocksize * 8) {
1597                 printk (KERN_ERR
1598                         "EXT3-fs: #blocks per group too big: %lu\n",
1599                         sbi->s_blocks_per_group);
1600                 goto failed_mount;
1601         }
1602         if (sbi->s_frags_per_group > blocksize * 8) {
1603                 printk (KERN_ERR
1604                         "EXT3-fs: #fragments per group too big: %lu\n",
1605                         sbi->s_frags_per_group);
1606                 goto failed_mount;
1607         }
1608         if (sbi->s_inodes_per_group > blocksize * 8) {
1609                 printk (KERN_ERR
1610                         "EXT3-fs: #inodes per group too big: %lu\n",
1611                         sbi->s_inodes_per_group);
1612                 goto failed_mount;
1613         }
1614
1615         if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1616                 goto cantfind_ext3;
1617         sbi->s_groups_count = (le32_to_cpu(es->s_blocks_count) -
1618                                le32_to_cpu(es->s_first_data_block) +
1619                                EXT3_BLOCKS_PER_GROUP(sb) - 1) /
1620                               EXT3_BLOCKS_PER_GROUP(sb);
1621         db_count = (sbi->s_groups_count + EXT3_DESC_PER_BLOCK(sb) - 1) /
1622                    EXT3_DESC_PER_BLOCK(sb);
1623         sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1624                                     GFP_KERNEL);
1625         if (sbi->s_group_desc == NULL) {
1626                 printk (KERN_ERR "EXT3-fs: not enough memory\n");
1627                 goto failed_mount;
1628         }
1629
1630         percpu_counter_init(&sbi->s_freeblocks_counter);
1631         percpu_counter_init(&sbi->s_freeinodes_counter);
1632         percpu_counter_init(&sbi->s_dirs_counter);
1633         bgl_lock_init(&sbi->s_blockgroup_lock);
1634
1635         for (i = 0; i < db_count; i++) {
1636                 block = descriptor_loc(sb, logic_sb_block, i);
1637                 sbi->s_group_desc[i] = sb_bread(sb, block);
1638                 if (!sbi->s_group_desc[i]) {
1639                         printk (KERN_ERR "EXT3-fs: "
1640                                 "can't read group descriptor %d\n", i);
1641                         db_count = i;
1642                         goto failed_mount2;
1643                 }
1644         }
1645         if (!ext3_check_descriptors (sb)) {
1646                 printk (KERN_ERR "EXT3-fs: group descriptors corrupted !\n");
1647                 goto failed_mount2;
1648         }
1649         sbi->s_gdb_count = db_count;
1650         get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1651         spin_lock_init(&sbi->s_next_gen_lock);
1652         /* per fileystem reservation list head & lock */
1653         spin_lock_init(&sbi->s_rsv_window_lock);
1654         sbi->s_rsv_window_root = RB_ROOT;
1655         /* Add a single, static dummy reservation to the start of the
1656          * reservation window list --- it gives us a placeholder for
1657          * append-at-start-of-list which makes the allocation logic
1658          * _much_ simpler. */
1659         sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1660         sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1661         sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1662         sbi->s_rsv_window_head.rsv_goal_size = 0;
1663         ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1664
1665         /*
1666          * set up enough so that it can read an inode
1667          */
1668         sb->s_op = &ext3_sops;
1669         sb->s_export_op = &ext3_export_ops;
1670         sb->s_xattr = ext3_xattr_handlers;
1671 #ifdef CONFIG_QUOTA
1672         sb->s_qcop = &ext3_qctl_operations;
1673         sb->dq_op = &ext3_quota_operations;
1674 #endif
1675         INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1676
1677         sb->s_root = NULL;
1678
1679         needs_recovery = (es->s_last_orphan != 0 ||
1680                           EXT3_HAS_INCOMPAT_FEATURE(sb,
1681                                     EXT3_FEATURE_INCOMPAT_RECOVER));
1682
1683         /*
1684          * The first inode we look at is the journal inode.  Don't try
1685          * root first: it may be modified in the journal!
1686          */
1687         if (!test_opt(sb, NOLOAD) &&
1688             EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
1689                 if (ext3_load_journal(sb, es, journal_devnum))
1690                         goto failed_mount2;
1691         } else if (journal_inum) {
1692                 if (ext3_create_journal(sb, es, journal_inum))
1693                         goto failed_mount2;
1694         } else {
1695                 if (!silent)
1696                         printk (KERN_ERR
1697                                 "ext3: No journal on filesystem on %s\n",
1698                                 sb->s_id);
1699                 goto failed_mount2;
1700         }
1701
1702         /* We have now updated the journal if required, so we can
1703          * validate the data journaling mode. */
1704         switch (test_opt(sb, DATA_FLAGS)) {
1705         case 0:
1706                 /* No mode set, assume a default based on the journal
1707                    capabilities: ORDERED_DATA if the journal can
1708                    cope, else JOURNAL_DATA */
1709                 if (journal_check_available_features
1710                     (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
1711                         set_opt(sbi->s_mount_opt, ORDERED_DATA);
1712                 else
1713                         set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1714                 break;
1715
1716         case EXT3_MOUNT_ORDERED_DATA:
1717         case EXT3_MOUNT_WRITEBACK_DATA:
1718                 if (!journal_check_available_features
1719                     (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
1720                         printk(KERN_ERR "EXT3-fs: Journal does not support "
1721                                "requested data journaling mode\n");
1722                         goto failed_mount3;
1723                 }
1724         default:
1725                 break;
1726         }
1727
1728         if (test_opt(sb, NOBH)) {
1729                 if (sb->s_blocksize_bits != PAGE_CACHE_SHIFT) {
1730                         printk(KERN_WARNING "EXT3-fs: Ignoring nobh option "
1731                                 "since filesystem blocksize doesn't match "
1732                                 "pagesize\n");
1733                         clear_opt(sbi->s_mount_opt, NOBH);
1734                 }
1735                 if (!(test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)) {
1736                         printk(KERN_WARNING "EXT3-fs: Ignoring nobh option - "
1737                                 "its supported only with writeback mode\n");
1738                         clear_opt(sbi->s_mount_opt, NOBH);
1739                 }
1740         }
1741         /*
1742          * The journal_load will have done any necessary log recovery,
1743          * so we can safely mount the rest of the filesystem now.
1744          */
1745
1746         root = iget(sb, EXT3_ROOT_INO);
1747         sb->s_root = d_alloc_root(root);
1748         if (!sb->s_root) {
1749                 printk(KERN_ERR "EXT3-fs: get root inode failed\n");
1750                 iput(root);
1751                 goto failed_mount3;
1752         }
1753         if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1754                 dput(sb->s_root);
1755                 sb->s_root = NULL;
1756                 printk(KERN_ERR "EXT3-fs: corrupt root inode, run e2fsck\n");
1757                 goto failed_mount3;
1758         }
1759
1760         ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
1761         /*
1762          * akpm: core read_super() calls in here with the superblock locked.
1763          * That deadlocks, because orphan cleanup needs to lock the superblock
1764          * in numerous places.  Here we just pop the lock - it's relatively
1765          * harmless, because we are now ready to accept write_super() requests,
1766          * and aviro says that's the only reason for hanging onto the
1767          * superblock lock.
1768          */
1769         EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
1770         ext3_orphan_cleanup(sb, es);
1771         EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
1772         if (needs_recovery)
1773                 printk (KERN_INFO "EXT3-fs: recovery complete.\n");
1774         ext3_mark_recovery_complete(sb, es);
1775         printk (KERN_INFO "EXT3-fs: mounted filesystem with %s data mode.\n",
1776                 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
1777                 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
1778                 "writeback");
1779
1780         percpu_counter_mod(&sbi->s_freeblocks_counter,
1781                 ext3_count_free_blocks(sb));
1782         percpu_counter_mod(&sbi->s_freeinodes_counter,
1783                 ext3_count_free_inodes(sb));
1784         percpu_counter_mod(&sbi->s_dirs_counter,
1785                 ext3_count_dirs(sb));
1786
1787         lock_kernel();
1788         return 0;
1789
1790 cantfind_ext3:
1791         if (!silent)
1792                 printk(KERN_ERR "VFS: Can't find ext3 filesystem on dev %s.\n",
1793                        sb->s_id);
1794         goto failed_mount;
1795
1796 failed_mount3:
1797         journal_destroy(sbi->s_journal);
1798 failed_mount2:
1799         for (i = 0; i < db_count; i++)
1800                 brelse(sbi->s_group_desc[i]);
1801         kfree(sbi->s_group_desc);
1802 failed_mount:
1803 #ifdef CONFIG_QUOTA
1804         for (i = 0; i < MAXQUOTAS; i++)
1805                 kfree(sbi->s_qf_names[i]);
1806 #endif
1807         ext3_blkdev_remove(sbi);
1808         brelse(bh);
1809 out_fail:
1810         sb->s_fs_info = NULL;
1811         kfree(sbi);
1812         lock_kernel();
1813         return -EINVAL;
1814 }
1815
1816 /*
1817  * Setup any per-fs journal parameters now.  We'll do this both on
1818  * initial mount, once the journal has been initialised but before we've
1819  * done any recovery; and again on any subsequent remount.
1820  */
1821 static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
1822 {
1823         struct ext3_sb_info *sbi = EXT3_SB(sb);
1824
1825         if (sbi->s_commit_interval)
1826                 journal->j_commit_interval = sbi->s_commit_interval;
1827         /* We could also set up an ext3-specific default for the commit
1828          * interval here, but for now we'll just fall back to the jbd
1829          * default. */
1830
1831         spin_lock(&journal->j_state_lock);
1832         if (test_opt(sb, BARRIER))
1833                 journal->j_flags |= JFS_BARRIER;
1834         else
1835                 journal->j_flags &= ~JFS_BARRIER;
1836         spin_unlock(&journal->j_state_lock);
1837 }
1838
1839 static journal_t *ext3_get_journal(struct super_block *sb, int journal_inum)
1840 {
1841         struct inode *journal_inode;
1842         journal_t *journal;
1843
1844         /* First, test for the existence of a valid inode on disk.  Bad
1845          * things happen if we iget() an unused inode, as the subsequent
1846          * iput() will try to delete it. */
1847
1848         journal_inode = iget(sb, journal_inum);
1849         if (!journal_inode) {
1850                 printk(KERN_ERR "EXT3-fs: no journal found.\n");
1851                 return NULL;
1852         }
1853         if (!journal_inode->i_nlink) {
1854                 make_bad_inode(journal_inode);
1855                 iput(journal_inode);
1856                 printk(KERN_ERR "EXT3-fs: journal inode is deleted.\n");
1857                 return NULL;
1858         }
1859
1860         jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
1861                   journal_inode, journal_inode->i_size);
1862         if (is_bad_inode(journal_inode) || !S_ISREG(journal_inode->i_mode)) {
1863                 printk(KERN_ERR "EXT3-fs: invalid journal inode.\n");
1864                 iput(journal_inode);
1865                 return NULL;
1866         }
1867
1868         journal = journal_init_inode(journal_inode);
1869         if (!journal) {
1870                 printk(KERN_ERR "EXT3-fs: Could not load journal inode\n");
1871                 iput(journal_inode);
1872                 return NULL;
1873         }
1874         journal->j_private = sb;
1875         ext3_init_journal_params(sb, journal);
1876         return journal;
1877 }
1878
1879 static journal_t *ext3_get_dev_journal(struct super_block *sb,
1880                                        dev_t j_dev)
1881 {
1882         struct buffer_head * bh;
1883         journal_t *journal;
1884         int start;
1885         int len;
1886         int hblock, blocksize;
1887         unsigned long sb_block;
1888         unsigned long offset;
1889         struct ext3_super_block * es;
1890         struct block_device *bdev;
1891
1892         bdev = ext3_blkdev_get(j_dev);
1893         if (bdev == NULL)
1894                 return NULL;
1895
1896         if (bd_claim(bdev, sb)) {
1897                 printk(KERN_ERR
1898                         "EXT3: failed to claim external journal device.\n");
1899                 blkdev_put(bdev);
1900                 return NULL;
1901         }
1902
1903         blocksize = sb->s_blocksize;
1904         hblock = bdev_hardsect_size(bdev);
1905         if (blocksize < hblock) {
1906                 printk(KERN_ERR
1907                         "EXT3-fs: blocksize too small for journal device.\n");
1908                 goto out_bdev;
1909         }
1910
1911         sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
1912         offset = EXT3_MIN_BLOCK_SIZE % blocksize;
1913         set_blocksize(bdev, blocksize);
1914         if (!(bh = __bread(bdev, sb_block, blocksize))) {
1915                 printk(KERN_ERR "EXT3-fs: couldn't read superblock of "
1916                        "external journal\n");
1917                 goto out_bdev;
1918         }
1919
1920         es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1921         if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
1922             !(le32_to_cpu(es->s_feature_incompat) &
1923               EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
1924                 printk(KERN_ERR "EXT3-fs: external journal has "
1925                                         "bad superblock\n");
1926                 brelse(bh);
1927                 goto out_bdev;
1928         }
1929
1930         if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
1931                 printk(KERN_ERR "EXT3-fs: journal UUID does not match\n");
1932                 brelse(bh);
1933                 goto out_bdev;
1934         }
1935
1936         len = le32_to_cpu(es->s_blocks_count);
1937         start = sb_block + 1;
1938         brelse(bh);     /* we're done with the superblock */
1939
1940         journal = journal_init_dev(bdev, sb->s_bdev,
1941                                         start, len, blocksize);
1942         if (!journal) {
1943                 printk(KERN_ERR "EXT3-fs: failed to create device journal\n");
1944                 goto out_bdev;
1945         }
1946         journal->j_private = sb;
1947         ll_rw_block(READ, 1, &journal->j_sb_buffer);
1948         wait_on_buffer(journal->j_sb_buffer);
1949         if (!buffer_uptodate(journal->j_sb_buffer)) {
1950                 printk(KERN_ERR "EXT3-fs: I/O error on journal device\n");
1951                 goto out_journal;
1952         }
1953         if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
1954                 printk(KERN_ERR "EXT3-fs: External journal has more than one "
1955                                         "user (unsupported) - %d\n",
1956                         be32_to_cpu(journal->j_superblock->s_nr_users));
1957                 goto out_journal;
1958         }
1959         EXT3_SB(sb)->journal_bdev = bdev;
1960         ext3_init_journal_params(sb, journal);
1961         return journal;
1962 out_journal:
1963         journal_destroy(journal);
1964 out_bdev:
1965         ext3_blkdev_put(bdev);
1966         return NULL;
1967 }
1968
1969 static int ext3_load_journal(struct super_block *sb,
1970                              struct ext3_super_block *es,
1971                              unsigned long journal_devnum)
1972 {
1973         journal_t *journal;
1974         int journal_inum = le32_to_cpu(es->s_journal_inum);
1975         dev_t journal_dev;
1976         int err = 0;
1977         int really_read_only;
1978
1979         if (journal_devnum &&
1980             journal_devnum != le32_to_cpu(es->s_journal_dev)) {
1981                 printk(KERN_INFO "EXT3-fs: external journal device major/minor "
1982                         "numbers have changed\n");
1983                 journal_dev = new_decode_dev(journal_devnum);
1984         } else
1985                 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
1986
1987         really_read_only = bdev_read_only(sb->s_bdev);
1988
1989         /*
1990          * Are we loading a blank journal or performing recovery after a
1991          * crash?  For recovery, we need to check in advance whether we
1992          * can get read-write access to the device.
1993          */
1994
1995         if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
1996                 if (sb->s_flags & MS_RDONLY) {
1997                         printk(KERN_INFO "EXT3-fs: INFO: recovery "
1998                                         "required on readonly filesystem.\n");
1999                         if (really_read_only) {
2000                                 printk(KERN_ERR "EXT3-fs: write access "
2001                                         "unavailable, cannot proceed.\n");
2002                                 return -EROFS;
2003                         }
2004                         printk (KERN_INFO "EXT3-fs: write access will "
2005                                         "be enabled during recovery.\n");
2006                 }
2007         }
2008
2009         if (journal_inum && journal_dev) {
2010                 printk(KERN_ERR "EXT3-fs: filesystem has both journal "
2011                        "and inode journals!\n");
2012                 return -EINVAL;
2013         }
2014
2015         if (journal_inum) {
2016                 if (!(journal = ext3_get_journal(sb, journal_inum)))
2017                         return -EINVAL;
2018         } else {
2019                 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
2020                         return -EINVAL;
2021         }
2022
2023         if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2024                 err = journal_update_format(journal);
2025                 if (err)  {
2026                         printk(KERN_ERR "EXT3-fs: error updating journal.\n");
2027                         journal_destroy(journal);
2028                         return err;
2029                 }
2030         }
2031
2032         if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
2033                 err = journal_wipe(journal, !really_read_only);
2034         if (!err)
2035                 err = journal_load(journal);
2036
2037         if (err) {
2038                 printk(KERN_ERR "EXT3-fs: error loading journal.\n");
2039                 journal_destroy(journal);
2040                 return err;
2041         }
2042
2043         EXT3_SB(sb)->s_journal = journal;
2044         ext3_clear_journal_err(sb, es);
2045
2046         if (journal_devnum &&
2047             journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2048                 es->s_journal_dev = cpu_to_le32(journal_devnum);
2049                 sb->s_dirt = 1;
2050
2051                 /* Make sure we flush the recovery flag to disk. */
2052                 ext3_commit_super(sb, es, 1);
2053         }
2054
2055         return 0;
2056 }
2057
2058 static int ext3_create_journal(struct super_block * sb,
2059                                struct ext3_super_block * es,
2060                                int journal_inum)
2061 {
2062         journal_t *journal;
2063
2064         if (sb->s_flags & MS_RDONLY) {
2065                 printk(KERN_ERR "EXT3-fs: readonly filesystem when trying to "
2066                                 "create journal.\n");
2067                 return -EROFS;
2068         }
2069
2070         if (!(journal = ext3_get_journal(sb, journal_inum)))
2071                 return -EINVAL;
2072
2073         printk(KERN_INFO "EXT3-fs: creating new journal on inode %d\n",
2074                journal_inum);
2075
2076         if (journal_create(journal)) {
2077                 printk(KERN_ERR "EXT3-fs: error creating journal.\n");
2078                 journal_destroy(journal);
2079                 return -EIO;
2080         }
2081
2082         EXT3_SB(sb)->s_journal = journal;
2083
2084         ext3_update_dynamic_rev(sb);
2085         EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2086         EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2087
2088         es->s_journal_inum = cpu_to_le32(journal_inum);
2089         sb->s_dirt = 1;
2090
2091         /* Make sure we flush the recovery flag to disk. */
2092         ext3_commit_super(sb, es, 1);
2093
2094         return 0;
2095 }
2096
2097 static void ext3_commit_super (struct super_block * sb,
2098                                struct ext3_super_block * es,
2099                                int sync)
2100 {
2101         struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
2102
2103         if (!sbh)
2104                 return;
2105         es->s_wtime = cpu_to_le32(get_seconds());
2106         es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2107         es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2108         BUFFER_TRACE(sbh, "marking dirty");
2109         mark_buffer_dirty(sbh);
2110         if (sync)
2111                 sync_dirty_buffer(sbh);
2112 }
2113
2114
2115 /*
2116  * Have we just finished recovery?  If so, and if we are mounting (or
2117  * remounting) the filesystem readonly, then we will end up with a
2118  * consistent fs on disk.  Record that fact.
2119  */
2120 static void ext3_mark_recovery_complete(struct super_block * sb,
2121                                         struct ext3_super_block * es)
2122 {
2123         journal_t *journal = EXT3_SB(sb)->s_journal;
2124
2125         journal_lock_updates(journal);
2126         journal_flush(journal);
2127         if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2128             sb->s_flags & MS_RDONLY) {
2129                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2130                 sb->s_dirt = 0;
2131                 ext3_commit_super(sb, es, 1);
2132         }
2133         journal_unlock_updates(journal);
2134 }
2135
2136 /*
2137  * If we are mounting (or read-write remounting) a filesystem whose journal
2138  * has recorded an error from a previous lifetime, move that error to the
2139  * main filesystem now.
2140  */
2141 static void ext3_clear_journal_err(struct super_block * sb,
2142                                    struct ext3_super_block * es)
2143 {
2144         journal_t *journal;
2145         int j_errno;
2146         const char *errstr;
2147
2148         journal = EXT3_SB(sb)->s_journal;
2149
2150         /*
2151          * Now check for any error status which may have been recorded in the
2152          * journal by a prior ext3_error() or ext3_abort()
2153          */
2154
2155         j_errno = journal_errno(journal);
2156         if (j_errno) {
2157                 char nbuf[16];
2158
2159                 errstr = ext3_decode_error(sb, j_errno, nbuf);
2160                 ext3_warning(sb, __FUNCTION__, "Filesystem error recorded "
2161                              "from previous mount: %s", errstr);
2162                 ext3_warning(sb, __FUNCTION__, "Marking fs in need of "
2163                              "filesystem check.");
2164
2165                 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2166                 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2167                 ext3_commit_super (sb, es, 1);
2168
2169                 journal_clear_err(journal);
2170         }
2171 }
2172
2173 /*
2174  * Force the running and committing transactions to commit,
2175  * and wait on the commit.
2176  */
2177 int ext3_force_commit(struct super_block *sb)
2178 {
2179         journal_t *journal;
2180         int ret;
2181
2182         if (sb->s_flags & MS_RDONLY)
2183                 return 0;
2184
2185         journal = EXT3_SB(sb)->s_journal;
2186         sb->s_dirt = 0;
2187         ret = ext3_journal_force_commit(journal);
2188         return ret;
2189 }
2190
2191 /*
2192  * Ext3 always journals updates to the superblock itself, so we don't
2193  * have to propagate any other updates to the superblock on disk at this
2194  * point.  Just start an async writeback to get the buffers on their way
2195  * to the disk.
2196  *
2197  * This implicitly triggers the writebehind on sync().
2198  */
2199
2200 static void ext3_write_super (struct super_block * sb)
2201 {
2202         if (mutex_trylock(&sb->s_lock) != 0)
2203                 BUG();
2204         sb->s_dirt = 0;
2205 }
2206
2207 static int ext3_sync_fs(struct super_block *sb, int wait)
2208 {
2209         tid_t target;
2210
2211         sb->s_dirt = 0;
2212         if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2213                 if (wait)
2214                         log_wait_commit(EXT3_SB(sb)->s_journal, target);
2215         }
2216         return 0;
2217 }
2218
2219 /*
2220  * LVM calls this function before a (read-only) snapshot is created.  This
2221  * gives us a chance to flush the journal completely and mark the fs clean.
2222  */
2223 static void ext3_write_super_lockfs(struct super_block *sb)
2224 {
2225         sb->s_dirt = 0;
2226
2227         if (!(sb->s_flags & MS_RDONLY)) {
2228                 journal_t *journal = EXT3_SB(sb)->s_journal;
2229
2230                 /* Now we set up the journal barrier. */
2231                 journal_lock_updates(journal);
2232                 journal_flush(journal);
2233
2234                 /* Journal blocked and flushed, clear needs_recovery flag. */
2235                 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2236                 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2237         }
2238 }
2239
2240 /*
2241  * Called by LVM after the snapshot is done.  We need to reset the RECOVER
2242  * flag here, even though the filesystem is not technically dirty yet.
2243  */
2244 static void ext3_unlockfs(struct super_block *sb)
2245 {
2246         if (!(sb->s_flags & MS_RDONLY)) {
2247                 lock_super(sb);
2248                 /* Reser the needs_recovery flag before the fs is unlocked. */
2249                 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2250                 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2251                 unlock_super(sb);
2252                 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2253         }
2254 }
2255
2256 static int ext3_remount (struct super_block * sb, int * flags, char * data)
2257 {
2258         struct ext3_super_block * es;
2259         struct ext3_sb_info *sbi = EXT3_SB(sb);
2260         unsigned long n_blocks_count = 0;
2261         unsigned long old_sb_flags;
2262         struct ext3_mount_options old_opts;
2263         int err;
2264 #ifdef CONFIG_QUOTA
2265         int i;
2266 #endif
2267
2268         /* Store the original options */
2269         old_sb_flags = sb->s_flags;
2270         old_opts.s_mount_opt = sbi->s_mount_opt;
2271         old_opts.s_resuid = sbi->s_resuid;
2272         old_opts.s_resgid = sbi->s_resgid;
2273         old_opts.s_commit_interval = sbi->s_commit_interval;
2274 #ifdef CONFIG_QUOTA
2275         old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2276         for (i = 0; i < MAXQUOTAS; i++)
2277                 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2278 #endif
2279
2280         /*
2281          * Allow the "check" option to be passed as a remount option.
2282          */
2283         if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2284                 err = -EINVAL;
2285                 goto restore_opts;
2286         }
2287
2288         if (sbi->s_mount_opt & EXT3_MOUNT_ABORT)
2289                 ext3_abort(sb, __FUNCTION__, "Abort forced by user");
2290         if ((sbi->s_mount_opt & EXT3_MOUNT_TAGXID) &&
2291                 !(sb->s_flags & MS_TAGXID)) {
2292                 printk("EXT3-fs: %s: tagxid not permitted on remount.\n",
2293                         sb->s_id);
2294                 return -EINVAL;
2295         }
2296
2297         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2298                 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2299
2300         es = sbi->s_es;
2301
2302         ext3_init_journal_params(sb, sbi->s_journal);
2303
2304         if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2305                 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
2306                 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT) {
2307                         err = -EROFS;
2308                         goto restore_opts;
2309                 }
2310
2311                 if (*flags & MS_RDONLY) {
2312                         /*
2313                          * First of all, the unconditional stuff we have to do
2314                          * to disable replay of the journal when we next remount
2315                          */
2316                         sb->s_flags |= MS_RDONLY;
2317
2318                         /*
2319                          * OK, test if we are remounting a valid rw partition
2320                          * readonly, and if so set the rdonly flag and then
2321                          * mark the partition as valid again.
2322                          */
2323                         if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2324                             (sbi->s_mount_state & EXT3_VALID_FS))
2325                                 es->s_state = cpu_to_le16(sbi->s_mount_state);
2326
2327                         ext3_mark_recovery_complete(sb, es);
2328                 } else {
2329                         __le32 ret;
2330                         if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2331                                         ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2332                                 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2333                                        "remount RDWR because of unsupported "
2334                                        "optional features (%x).\n",
2335                                        sb->s_id, le32_to_cpu(ret));
2336                                 err = -EROFS;
2337                                 goto restore_opts;
2338                         }
2339                         /*
2340                          * Mounting a RDONLY partition read-write, so reread
2341                          * and store the current valid flag.  (It may have
2342                          * been changed by e2fsck since we originally mounted
2343                          * the partition.)
2344                          */
2345                         ext3_clear_journal_err(sb, es);
2346                         sbi->s_mount_state = le16_to_cpu(es->s_state);
2347                         if ((ret = ext3_group_extend(sb, es, n_blocks_count))) {
2348                                 err = ret;
2349                                 goto restore_opts;
2350                         }
2351                         if (!ext3_setup_super (sb, es, 0))
2352                                 sb->s_flags &= ~MS_RDONLY;
2353                 }
2354         }
2355 #ifdef CONFIG_QUOTA
2356         /* Release old quota file names */
2357         for (i = 0; i < MAXQUOTAS; i++)
2358                 if (old_opts.s_qf_names[i] &&
2359                     old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2360                         kfree(old_opts.s_qf_names[i]);
2361 #endif
2362         return 0;
2363 restore_opts:
2364         sb->s_flags = old_sb_flags;
2365         sbi->s_mount_opt = old_opts.s_mount_opt;
2366         sbi->s_resuid = old_opts.s_resuid;
2367         sbi->s_resgid = old_opts.s_resgid;
2368         sbi->s_commit_interval = old_opts.s_commit_interval;
2369 #ifdef CONFIG_QUOTA
2370         sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2371         for (i = 0; i < MAXQUOTAS; i++) {
2372                 if (sbi->s_qf_names[i] &&
2373                     old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2374                         kfree(sbi->s_qf_names[i]);
2375                 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2376         }
2377 #endif
2378         return err;
2379 }
2380
2381 static int ext3_statfs (struct super_block * sb, struct kstatfs * buf)
2382 {
2383         struct ext3_super_block *es = EXT3_SB(sb)->s_es;
2384         unsigned long overhead;
2385         int i;
2386
2387         if (test_opt (sb, MINIX_DF))
2388                 overhead = 0;
2389         else {
2390                 unsigned long ngroups;
2391                 ngroups = EXT3_SB(sb)->s_groups_count;
2392                 smp_rmb();
2393
2394                 /*
2395                  * Compute the overhead (FS structures)
2396                  */
2397
2398                 /*
2399                  * All of the blocks before first_data_block are
2400                  * overhead
2401                  */
2402                 overhead = le32_to_cpu(es->s_first_data_block);
2403
2404                 /*
2405                  * Add the overhead attributed to the superblock and
2406                  * block group descriptors.  If the sparse superblocks
2407                  * feature is turned on, then not all groups have this.
2408                  */
2409                 for (i = 0; i < ngroups; i++) {
2410                         overhead += ext3_bg_has_super(sb, i) +
2411                                 ext3_bg_num_gdb(sb, i);
2412                         cond_resched();
2413                 }
2414
2415                 /*
2416                  * Every block group has an inode bitmap, a block
2417                  * bitmap, and an inode table.
2418                  */
2419                 overhead += (ngroups * (2 + EXT3_SB(sb)->s_itb_per_group));
2420         }
2421
2422         buf->f_type = EXT3_SUPER_MAGIC;
2423         buf->f_bsize = sb->s_blocksize;
2424         buf->f_blocks = le32_to_cpu(es->s_blocks_count) - overhead;
2425         buf->f_bfree = ext3_count_free_blocks (sb);
2426         buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2427         if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2428                 buf->f_bavail = 0;
2429         buf->f_files = le32_to_cpu(es->s_inodes_count);
2430         buf->f_ffree = ext3_count_free_inodes (sb);
2431         buf->f_namelen = EXT3_NAME_LEN;
2432         return 0;
2433 }
2434
2435 /* Helper function for writing quotas on sync - we need to start transaction before quota file
2436  * is locked for write. Otherwise the are possible deadlocks:
2437  * Process 1                         Process 2
2438  * ext3_create()                     quota_sync()
2439  *   journal_start()                   write_dquot()
2440  *   DQUOT_INIT()                        down(dqio_sem)
2441  *     down(dqio_sem)                    journal_start()
2442  *
2443  */
2444
2445 #ifdef CONFIG_QUOTA
2446
2447 static inline struct inode *dquot_to_inode(struct dquot *dquot)
2448 {
2449         return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2450 }
2451
2452 static int ext3_dquot_initialize(struct inode *inode, int type)
2453 {
2454         handle_t *handle;
2455         int ret, err;
2456
2457         /* We may create quota structure so we need to reserve enough blocks */
2458         handle = ext3_journal_start(inode, 2*EXT3_QUOTA_INIT_BLOCKS(inode->i_sb));
2459         if (IS_ERR(handle))
2460                 return PTR_ERR(handle);
2461         ret = dquot_initialize(inode, type);
2462         err = ext3_journal_stop(handle);
2463         if (!ret)
2464                 ret = err;
2465         return ret;
2466 }
2467
2468 static int ext3_dquot_drop(struct inode *inode)
2469 {
2470         handle_t *handle;
2471         int ret, err;
2472
2473         /* We may delete quota structure so we need to reserve enough blocks */
2474         handle = ext3_journal_start(inode, 2*EXT3_QUOTA_DEL_BLOCKS(inode->i_sb));
2475         if (IS_ERR(handle))
2476                 return PTR_ERR(handle);
2477         ret = dquot_drop(inode);
2478         err = ext3_journal_stop(handle);
2479         if (!ret)
2480                 ret = err;
2481         return ret;
2482 }
2483
2484 static int ext3_write_dquot(struct dquot *dquot)
2485 {
2486         int ret, err;
2487         handle_t *handle;
2488         struct inode *inode;
2489
2490         inode = dquot_to_inode(dquot);
2491         handle = ext3_journal_start(inode,
2492                                         EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2493         if (IS_ERR(handle))
2494                 return PTR_ERR(handle);
2495         ret = dquot_commit(dquot);
2496         err = ext3_journal_stop(handle);
2497         if (!ret)
2498                 ret = err;
2499         return ret;
2500 }
2501
2502 static int ext3_acquire_dquot(struct dquot *dquot)
2503 {
2504         int ret, err;
2505         handle_t *handle;
2506
2507         handle = ext3_journal_start(dquot_to_inode(dquot),
2508                                         EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2509         if (IS_ERR(handle))
2510                 return PTR_ERR(handle);
2511         ret = dquot_acquire(dquot);
2512         err = ext3_journal_stop(handle);
2513         if (!ret)
2514                 ret = err;
2515         return ret;
2516 }
2517
2518 static int ext3_release_dquot(struct dquot *dquot)
2519 {
2520         int ret, err;
2521         handle_t *handle;
2522
2523         handle = ext3_journal_start(dquot_to_inode(dquot),
2524                                         EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2525         if (IS_ERR(handle))
2526                 return PTR_ERR(handle);
2527         ret = dquot_release(dquot);
2528         err = ext3_journal_stop(handle);
2529         if (!ret)
2530                 ret = err;
2531         return ret;
2532 }
2533
2534 static int ext3_mark_dquot_dirty(struct dquot *dquot)
2535 {
2536         /* Are we journalling quotas? */
2537         if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2538             EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2539                 dquot_mark_dquot_dirty(dquot);
2540                 return ext3_write_dquot(dquot);
2541         } else {
2542                 return dquot_mark_dquot_dirty(dquot);
2543         }
2544 }
2545
2546 static int ext3_write_info(struct super_block *sb, int type)
2547 {
2548         int ret, err;
2549         handle_t *handle;
2550
2551         /* Data block + inode block */
2552         handle = ext3_journal_start(sb->s_root->d_inode, 2);
2553         if (IS_ERR(handle))
2554                 return PTR_ERR(handle);
2555         ret = dquot_commit_info(sb, type);
2556         err = ext3_journal_stop(handle);
2557         if (!ret)
2558                 ret = err;
2559         return ret;
2560 }
2561
2562 /*
2563  * Turn on quotas during mount time - we need to find
2564  * the quota file and such...
2565  */
2566 static int ext3_quota_on_mount(struct super_block *sb, int type)
2567 {
2568         return vfs_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2569                         EXT3_SB(sb)->s_jquota_fmt, type);
2570 }
2571
2572 /*
2573  * Standard function to be called on quota_on
2574  */
2575 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
2576                          char *path)
2577 {
2578         int err;
2579         struct nameidata nd;
2580
2581         if (!test_opt(sb, QUOTA))
2582                 return -EINVAL;
2583         /* Not journalling quota? */
2584         if (!EXT3_SB(sb)->s_qf_names[USRQUOTA] &&
2585             !EXT3_SB(sb)->s_qf_names[GRPQUOTA])
2586                 return vfs_quota_on(sb, type, format_id, path);
2587         err = path_lookup(path, LOOKUP_FOLLOW, &nd);
2588         if (err)
2589                 return err;
2590         /* Quotafile not on the same filesystem? */
2591         if (nd.mnt->mnt_sb != sb) {
2592                 path_release(&nd);
2593                 return -EXDEV;
2594         }
2595         /* Quotafile not of fs root? */
2596         if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode)
2597                 printk(KERN_WARNING
2598                         "EXT3-fs: Quota file not on filesystem root. "
2599                         "Journalled quota will not work.\n");
2600         path_release(&nd);
2601         return vfs_quota_on(sb, type, format_id, path);
2602 }
2603
2604 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2605  * acquiring the locks... As quota files are never truncated and quota code
2606  * itself serializes the operations (and noone else should touch the files)
2607  * we don't have to be afraid of races */
2608 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2609                                size_t len, loff_t off)
2610 {
2611         struct inode *inode = sb_dqopt(sb)->files[type];
2612         sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2613         int err = 0;
2614         int offset = off & (sb->s_blocksize - 1);
2615         int tocopy;
2616         size_t toread;
2617         struct buffer_head *bh;
2618         loff_t i_size = i_size_read(inode);
2619
2620         if (off > i_size)
2621                 return 0;
2622         if (off+len > i_size)
2623                 len = i_size-off;
2624         toread = len;
2625         while (toread > 0) {
2626                 tocopy = sb->s_blocksize - offset < toread ?
2627                                 sb->s_blocksize - offset : toread;
2628                 bh = ext3_bread(NULL, inode, blk, 0, &err);
2629                 if (err)
2630                         return err;
2631                 if (!bh)        /* A hole? */
2632                         memset(data, 0, tocopy);
2633                 else
2634                         memcpy(data, bh->b_data+offset, tocopy);
2635                 brelse(bh);
2636                 offset = 0;
2637                 toread -= tocopy;
2638                 data += tocopy;
2639                 blk++;
2640         }
2641         return len;
2642 }
2643
2644 /* Write to quotafile (we know the transaction is already started and has
2645  * enough credits) */
2646 static ssize_t ext3_quota_write(struct super_block *sb, int type,
2647                                 const char *data, size_t len, loff_t off)
2648 {
2649         struct inode *inode = sb_dqopt(sb)->files[type];
2650         sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2651         int err = 0;
2652         int offset = off & (sb->s_blocksize - 1);
2653         int tocopy;
2654         int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
2655         size_t towrite = len;
2656         struct buffer_head *bh;
2657         handle_t *handle = journal_current_handle();
2658
2659         mutex_lock(&inode->i_mutex);
2660         while (towrite > 0) {
2661                 tocopy = sb->s_blocksize - offset < towrite ?
2662                                 sb->s_blocksize - offset : towrite;
2663                 bh = ext3_bread(handle, inode, blk, 1, &err);
2664                 if (!bh)
2665                         goto out;
2666                 if (journal_quota) {
2667                         err = ext3_journal_get_write_access(handle, bh);
2668                         if (err) {
2669                                 brelse(bh);
2670                                 goto out;
2671                         }
2672                 }
2673                 lock_buffer(bh);
2674                 memcpy(bh->b_data+offset, data, tocopy);
2675                 flush_dcache_page(bh->b_page);
2676                 unlock_buffer(bh);
2677                 if (journal_quota)
2678                         err = ext3_journal_dirty_metadata(handle, bh);
2679                 else {
2680                         /* Always do at least ordered writes for quotas */
2681                         err = ext3_journal_dirty_data(handle, bh);
2682                         mark_buffer_dirty(bh);
2683                 }
2684                 brelse(bh);
2685                 if (err)
2686                         goto out;
2687                 offset = 0;
2688                 towrite -= tocopy;
2689                 data += tocopy;
2690                 blk++;
2691         }
2692 out:
2693         if (len == towrite)
2694                 return err;
2695         if (inode->i_size < off+len-towrite) {
2696                 i_size_write(inode, off+len-towrite);
2697                 EXT3_I(inode)->i_disksize = inode->i_size;
2698         }
2699         inode->i_version++;
2700         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2701         ext3_mark_inode_dirty(handle, inode);
2702         mutex_unlock(&inode->i_mutex);
2703         return len - towrite;
2704 }
2705
2706 #endif
2707
2708 static struct super_block *ext3_get_sb(struct file_system_type *fs_type,
2709         int flags, const char *dev_name, void *data)
2710 {
2711         return get_sb_bdev(fs_type, flags, dev_name, data, ext3_fill_super);
2712 }
2713
2714 static struct file_system_type ext3_fs_type = {
2715         .owner          = THIS_MODULE,
2716         .name           = "ext3",
2717         .get_sb         = ext3_get_sb,
2718         .kill_sb        = kill_block_super,
2719         .fs_flags       = FS_REQUIRES_DEV,
2720 };
2721
2722 static int __init init_ext3_fs(void)
2723 {
2724         int err = init_ext3_xattr();
2725         if (err)
2726                 return err;
2727         err = init_inodecache();
2728         if (err)
2729                 goto out1;
2730         err = register_filesystem(&ext3_fs_type);
2731         if (err)
2732                 goto out;
2733         return 0;
2734 out:
2735         destroy_inodecache();
2736 out1:
2737         exit_ext3_xattr();
2738         return err;
2739 }
2740
2741 static void __exit exit_ext3_fs(void)
2742 {
2743         unregister_filesystem(&ext3_fs_type);
2744         destroy_inodecache();
2745         exit_ext3_xattr();
2746 }
2747
2748 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
2749 MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
2750 MODULE_LICENSE("GPL");
2751 module_init(init_ext3_fs)
2752 module_exit(exit_ext3_fs)