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