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