linux/fs/reiserfs/super.c
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   1/*
   2 * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
   3 *
   4 * Trivial changes by Alan Cox to add the LFS fixes
   5 *
   6 * Trivial Changes:
   7 * Rights granted to Hans Reiser to redistribute under other terms providing
   8 * he accepts all liability including but not limited to patent, fitness
   9 * for purpose, and direct or indirect claims arising from failure to perform.
  10 *
  11 * NO WARRANTY
  12 */
  13
  14#include <linux/module.h>
  15#include <linux/slab.h>
  16#include <linux/vmalloc.h>
  17#include <linux/time.h>
  18#include <asm/uaccess.h>
  19#include "reiserfs.h"
  20#include "acl.h"
  21#include "xattr.h"
  22#include <linux/init.h>
  23#include <linux/blkdev.h>
  24#include <linux/buffer_head.h>
  25#include <linux/exportfs.h>
  26#include <linux/quotaops.h>
  27#include <linux/vfs.h>
  28#include <linux/mount.h>
  29#include <linux/namei.h>
  30#include <linux/crc32.h>
  31#include <linux/seq_file.h>
  32
  33struct file_system_type reiserfs_fs_type;
  34
  35static const char reiserfs_3_5_magic_string[] = REISERFS_SUPER_MAGIC_STRING;
  36static const char reiserfs_3_6_magic_string[] = REISER2FS_SUPER_MAGIC_STRING;
  37static const char reiserfs_jr_magic_string[] = REISER2FS_JR_SUPER_MAGIC_STRING;
  38
  39int is_reiserfs_3_5(struct reiserfs_super_block *rs)
  40{
  41        return !strncmp(rs->s_v1.s_magic, reiserfs_3_5_magic_string,
  42                        strlen(reiserfs_3_5_magic_string));
  43}
  44
  45int is_reiserfs_3_6(struct reiserfs_super_block *rs)
  46{
  47        return !strncmp(rs->s_v1.s_magic, reiserfs_3_6_magic_string,
  48                        strlen(reiserfs_3_6_magic_string));
  49}
  50
  51int is_reiserfs_jr(struct reiserfs_super_block *rs)
  52{
  53        return !strncmp(rs->s_v1.s_magic, reiserfs_jr_magic_string,
  54                        strlen(reiserfs_jr_magic_string));
  55}
  56
  57static int is_any_reiserfs_magic_string(struct reiserfs_super_block *rs)
  58{
  59        return (is_reiserfs_3_5(rs) || is_reiserfs_3_6(rs) ||
  60                is_reiserfs_jr(rs));
  61}
  62
  63static int reiserfs_remount(struct super_block *s, int *flags, char *data);
  64static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf);
  65void show_alloc_options(struct seq_file *seq, struct super_block *s);
  66
  67static int reiserfs_sync_fs(struct super_block *s, int wait)
  68{
  69        struct reiserfs_transaction_handle th;
  70
  71        /*
  72         * Writeback quota in non-journalled quota case - journalled quota has
  73         * no dirty dquots
  74         */
  75        dquot_writeback_dquots(s, -1);
  76        reiserfs_write_lock(s);
  77        if (!journal_begin(&th, s, 1))
  78                if (!journal_end_sync(&th, s, 1))
  79                        reiserfs_flush_old_commits(s);
  80        reiserfs_write_unlock(s);
  81        return 0;
  82}
  83
  84static void flush_old_commits(struct work_struct *work)
  85{
  86        struct reiserfs_sb_info *sbi;
  87        struct super_block *s;
  88
  89        sbi = container_of(work, struct reiserfs_sb_info, old_work.work);
  90        s = sbi->s_journal->j_work_sb;
  91
  92        spin_lock(&sbi->old_work_lock);
  93        sbi->work_queued = 0;
  94        spin_unlock(&sbi->old_work_lock);
  95
  96        reiserfs_sync_fs(s, 1);
  97}
  98
  99void reiserfs_schedule_old_flush(struct super_block *s)
 100{
 101        struct reiserfs_sb_info *sbi = REISERFS_SB(s);
 102        unsigned long delay;
 103
 104        if (s->s_flags & MS_RDONLY)
 105                return;
 106
 107        spin_lock(&sbi->old_work_lock);
 108        if (!sbi->work_queued) {
 109                delay = msecs_to_jiffies(dirty_writeback_interval * 10);
 110                queue_delayed_work(system_long_wq, &sbi->old_work, delay);
 111                sbi->work_queued = 1;
 112        }
 113        spin_unlock(&sbi->old_work_lock);
 114}
 115
 116static void cancel_old_flush(struct super_block *s)
 117{
 118        struct reiserfs_sb_info *sbi = REISERFS_SB(s);
 119
 120        cancel_delayed_work_sync(&REISERFS_SB(s)->old_work);
 121        spin_lock(&sbi->old_work_lock);
 122        sbi->work_queued = 0;
 123        spin_unlock(&sbi->old_work_lock);
 124}
 125
 126static int reiserfs_freeze(struct super_block *s)
 127{
 128        struct reiserfs_transaction_handle th;
 129
 130        cancel_old_flush(s);
 131
 132        reiserfs_write_lock(s);
 133        if (!(s->s_flags & MS_RDONLY)) {
 134                int err = journal_begin(&th, s, 1);
 135                if (err) {
 136                        reiserfs_block_writes(&th);
 137                } else {
 138                        reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
 139                                                     1);
 140                        journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
 141                        reiserfs_block_writes(&th);
 142                        journal_end_sync(&th, s, 1);
 143                }
 144        }
 145        reiserfs_write_unlock(s);
 146        return 0;
 147}
 148
 149static int reiserfs_unfreeze(struct super_block *s)
 150{
 151        reiserfs_allow_writes(s);
 152        return 0;
 153}
 154
 155extern const struct in_core_key MAX_IN_CORE_KEY;
 156
 157/* this is used to delete "save link" when there are no items of a
 158   file it points to. It can either happen if unlink is completed but
 159   "save unlink" removal, or if file has both unlink and truncate
 160   pending and as unlink completes first (because key of "save link"
 161   protecting unlink is bigger that a key lf "save link" which
 162   protects truncate), so there left no items to make truncate
 163   completion on */
 164static int remove_save_link_only(struct super_block *s,
 165                                 struct reiserfs_key *key, int oid_free)
 166{
 167        struct reiserfs_transaction_handle th;
 168        int err;
 169
 170        /* we are going to do one balancing */
 171        err = journal_begin(&th, s, JOURNAL_PER_BALANCE_CNT);
 172        if (err)
 173                return err;
 174
 175        reiserfs_delete_solid_item(&th, NULL, key);
 176        if (oid_free)
 177                /* removals are protected by direct items */
 178                reiserfs_release_objectid(&th, le32_to_cpu(key->k_objectid));
 179
 180        return journal_end(&th, s, JOURNAL_PER_BALANCE_CNT);
 181}
 182
 183#ifdef CONFIG_QUOTA
 184static int reiserfs_quota_on_mount(struct super_block *, int);
 185#endif
 186
 187/* look for uncompleted unlinks and truncates and complete them */
 188static int finish_unfinished(struct super_block *s)
 189{
 190        INITIALIZE_PATH(path);
 191        struct cpu_key max_cpu_key, obj_key;
 192        struct reiserfs_key save_link_key, last_inode_key;
 193        int retval = 0;
 194        struct item_head *ih;
 195        struct buffer_head *bh;
 196        int item_pos;
 197        char *item;
 198        int done;
 199        struct inode *inode;
 200        int truncate;
 201#ifdef CONFIG_QUOTA
 202        int i;
 203        int ms_active_set;
 204        int quota_enabled[MAXQUOTAS];
 205#endif
 206
 207        /* compose key to look for "save" links */
 208        max_cpu_key.version = KEY_FORMAT_3_5;
 209        max_cpu_key.on_disk_key.k_dir_id = ~0U;
 210        max_cpu_key.on_disk_key.k_objectid = ~0U;
 211        set_cpu_key_k_offset(&max_cpu_key, ~0U);
 212        max_cpu_key.key_length = 3;
 213
 214        memset(&last_inode_key, 0, sizeof(last_inode_key));
 215
 216#ifdef CONFIG_QUOTA
 217        /* Needed for iput() to work correctly and not trash data */
 218        if (s->s_flags & MS_ACTIVE) {
 219                ms_active_set = 0;
 220        } else {
 221                ms_active_set = 1;
 222                s->s_flags |= MS_ACTIVE;
 223        }
 224        /* Turn on quotas so that they are updated correctly */
 225        for (i = 0; i < MAXQUOTAS; i++) {
 226                quota_enabled[i] = 1;
 227                if (REISERFS_SB(s)->s_qf_names[i]) {
 228                        int ret;
 229
 230                        if (sb_has_quota_active(s, i)) {
 231                                quota_enabled[i] = 0;
 232                                continue;
 233                        }
 234                        ret = reiserfs_quota_on_mount(s, i);
 235                        if (ret < 0)
 236                                reiserfs_warning(s, "reiserfs-2500",
 237                                                 "cannot turn on journaled "
 238                                                 "quota: error %d", ret);
 239                }
 240        }
 241#endif
 242
 243        done = 0;
 244        REISERFS_SB(s)->s_is_unlinked_ok = 1;
 245        while (!retval) {
 246                retval = search_item(s, &max_cpu_key, &path);
 247                if (retval != ITEM_NOT_FOUND) {
 248                        reiserfs_error(s, "vs-2140",
 249                                       "search_by_key returned %d", retval);
 250                        break;
 251                }
 252
 253                bh = get_last_bh(&path);
 254                item_pos = get_item_pos(&path);
 255                if (item_pos != B_NR_ITEMS(bh)) {
 256                        reiserfs_warning(s, "vs-2060",
 257                                         "wrong position found");
 258                        break;
 259                }
 260                item_pos--;
 261                ih = B_N_PITEM_HEAD(bh, item_pos);
 262
 263                if (le32_to_cpu(ih->ih_key.k_dir_id) != MAX_KEY_OBJECTID)
 264                        /* there are no "save" links anymore */
 265                        break;
 266
 267                save_link_key = ih->ih_key;
 268                if (is_indirect_le_ih(ih))
 269                        truncate = 1;
 270                else
 271                        truncate = 0;
 272
 273                /* reiserfs_iget needs k_dirid and k_objectid only */
 274                item = B_I_PITEM(bh, ih);
 275                obj_key.on_disk_key.k_dir_id = le32_to_cpu(*(__le32 *) item);
 276                obj_key.on_disk_key.k_objectid =
 277                    le32_to_cpu(ih->ih_key.k_objectid);
 278                obj_key.on_disk_key.k_offset = 0;
 279                obj_key.on_disk_key.k_type = 0;
 280
 281                pathrelse(&path);
 282
 283                inode = reiserfs_iget(s, &obj_key);
 284                if (!inode) {
 285                        /* the unlink almost completed, it just did not manage to remove
 286                           "save" link and release objectid */
 287                        reiserfs_warning(s, "vs-2180", "iget failed for %K",
 288                                         &obj_key);
 289                        retval = remove_save_link_only(s, &save_link_key, 1);
 290                        continue;
 291                }
 292
 293                if (!truncate && inode->i_nlink) {
 294                        /* file is not unlinked */
 295                        reiserfs_warning(s, "vs-2185",
 296                                         "file %K is not unlinked",
 297                                         &obj_key);
 298                        retval = remove_save_link_only(s, &save_link_key, 0);
 299                        continue;
 300                }
 301                reiserfs_write_unlock(s);
 302                dquot_initialize(inode);
 303                reiserfs_write_lock(s);
 304
 305                if (truncate && S_ISDIR(inode->i_mode)) {
 306                        /* We got a truncate request for a dir which is impossible.
 307                           The only imaginable way is to execute unfinished truncate request
 308                           then boot into old kernel, remove the file and create dir with
 309                           the same key. */
 310                        reiserfs_warning(s, "green-2101",
 311                                         "impossible truncate on a "
 312                                         "directory %k. Please report",
 313                                         INODE_PKEY(inode));
 314                        retval = remove_save_link_only(s, &save_link_key, 0);
 315                        truncate = 0;
 316                        iput(inode);
 317                        continue;
 318                }
 319
 320                if (truncate) {
 321                        REISERFS_I(inode)->i_flags |=
 322                            i_link_saved_truncate_mask;
 323                        /* not completed truncate found. New size was committed together
 324                           with "save" link */
 325                        reiserfs_info(s, "Truncating %k to %Ld ..",
 326                                      INODE_PKEY(inode), inode->i_size);
 327                        reiserfs_truncate_file(inode,
 328                                               0
 329                                               /*don't update modification time */
 330                                               );
 331                        retval = remove_save_link(inode, truncate);
 332                } else {
 333                        REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
 334                        /* not completed unlink (rmdir) found */
 335                        reiserfs_info(s, "Removing %k..", INODE_PKEY(inode));
 336                        if (memcmp(&last_inode_key, INODE_PKEY(inode),
 337                                        sizeof(last_inode_key))){
 338                                last_inode_key = *INODE_PKEY(inode);
 339                                /* removal gets completed in iput */
 340                                retval = 0;
 341                        } else {
 342                                reiserfs_warning(s, "super-2189", "Dead loop "
 343                                                 "in finish_unfinished "
 344                                                 "detected, just remove "
 345                                                 "save link\n");
 346                                retval = remove_save_link_only(s,
 347                                                        &save_link_key, 0);
 348                        }
 349                }
 350
 351                iput(inode);
 352                printk("done\n");
 353                done++;
 354        }
 355        REISERFS_SB(s)->s_is_unlinked_ok = 0;
 356
 357#ifdef CONFIG_QUOTA
 358        /* Turn quotas off */
 359        for (i = 0; i < MAXQUOTAS; i++) {
 360                if (sb_dqopt(s)->files[i] && quota_enabled[i])
 361                        dquot_quota_off(s, i);
 362        }
 363        if (ms_active_set)
 364                /* Restore the flag back */
 365                s->s_flags &= ~MS_ACTIVE;
 366#endif
 367        pathrelse(&path);
 368        if (done)
 369                reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
 370                              "Completed\n", done);
 371        return retval;
 372}
 373
 374/* to protect file being unlinked from getting lost we "safe" link files
 375   being unlinked. This link will be deleted in the same transaction with last
 376   item of file. mounting the filesystem we scan all these links and remove
 377   files which almost got lost */
 378void add_save_link(struct reiserfs_transaction_handle *th,
 379                   struct inode *inode, int truncate)
 380{
 381        INITIALIZE_PATH(path);
 382        int retval;
 383        struct cpu_key key;
 384        struct item_head ih;
 385        __le32 link;
 386
 387        BUG_ON(!th->t_trans_id);
 388
 389        /* file can only get one "save link" of each kind */
 390        RFALSE(truncate &&
 391               (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
 392               "saved link already exists for truncated inode %lx",
 393               (long)inode->i_ino);
 394        RFALSE(!truncate &&
 395               (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
 396               "saved link already exists for unlinked inode %lx",
 397               (long)inode->i_ino);
 398
 399        /* setup key of "save" link */
 400        key.version = KEY_FORMAT_3_5;
 401        key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
 402        key.on_disk_key.k_objectid = inode->i_ino;
 403        if (!truncate) {
 404                /* unlink, rmdir, rename */
 405                set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
 406                set_cpu_key_k_type(&key, TYPE_DIRECT);
 407
 408                /* item head of "safe" link */
 409                make_le_item_head(&ih, &key, key.version,
 410                                  1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
 411                                  4 /*length */ , 0xffff /*free space */ );
 412        } else {
 413                /* truncate */
 414                if (S_ISDIR(inode->i_mode))
 415                        reiserfs_warning(inode->i_sb, "green-2102",
 416                                         "Adding a truncate savelink for "
 417                                         "a directory %k! Please report",
 418                                         INODE_PKEY(inode));
 419                set_cpu_key_k_offset(&key, 1);
 420                set_cpu_key_k_type(&key, TYPE_INDIRECT);
 421
 422                /* item head of "safe" link */
 423                make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT,
 424                                  4 /*length */ , 0 /*free space */ );
 425        }
 426        key.key_length = 3;
 427
 428        /* look for its place in the tree */
 429        retval = search_item(inode->i_sb, &key, &path);
 430        if (retval != ITEM_NOT_FOUND) {
 431                if (retval != -ENOSPC)
 432                        reiserfs_error(inode->i_sb, "vs-2100",
 433                                       "search_by_key (%K) returned %d", &key,
 434                                       retval);
 435                pathrelse(&path);
 436                return;
 437        }
 438
 439        /* body of "save" link */
 440        link = INODE_PKEY(inode)->k_dir_id;
 441
 442        /* put "save" link into tree, don't charge quota to anyone */
 443        retval =
 444            reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link);
 445        if (retval) {
 446                if (retval != -ENOSPC)
 447                        reiserfs_error(inode->i_sb, "vs-2120",
 448                                       "insert_item returned %d", retval);
 449        } else {
 450                if (truncate)
 451                        REISERFS_I(inode)->i_flags |=
 452                            i_link_saved_truncate_mask;
 453                else
 454                        REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
 455        }
 456}
 457
 458/* this opens transaction unlike add_save_link */
 459int remove_save_link(struct inode *inode, int truncate)
 460{
 461        struct reiserfs_transaction_handle th;
 462        struct reiserfs_key key;
 463        int err;
 464
 465        /* we are going to do one balancing only */
 466        err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
 467        if (err)
 468                return err;
 469
 470        /* setup key of "save" link */
 471        key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
 472        key.k_objectid = INODE_PKEY(inode)->k_objectid;
 473        if (!truncate) {
 474                /* unlink, rmdir, rename */
 475                set_le_key_k_offset(KEY_FORMAT_3_5, &key,
 476                                    1 + inode->i_sb->s_blocksize);
 477                set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
 478        } else {
 479                /* truncate */
 480                set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
 481                set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
 482        }
 483
 484        if ((truncate &&
 485             (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
 486            (!truncate &&
 487             (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
 488                /* don't take quota bytes from anywhere */
 489                reiserfs_delete_solid_item(&th, NULL, &key);
 490        if (!truncate) {
 491                reiserfs_release_objectid(&th, inode->i_ino);
 492                REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
 493        } else
 494                REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
 495
 496        return journal_end(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
 497}
 498
 499static void reiserfs_kill_sb(struct super_block *s)
 500{
 501        if (REISERFS_SB(s)) {
 502                /*
 503                 * Force any pending inode evictions to occur now. Any
 504                 * inodes to be removed that have extended attributes
 505                 * associated with them need to clean them up before
 506                 * we can release the extended attribute root dentries.
 507                 * shrink_dcache_for_umount will BUG if we don't release
 508                 * those before it's called so ->put_super is too late.
 509                 */
 510                shrink_dcache_sb(s);
 511
 512                dput(REISERFS_SB(s)->xattr_root);
 513                REISERFS_SB(s)->xattr_root = NULL;
 514                dput(REISERFS_SB(s)->priv_root);
 515                REISERFS_SB(s)->priv_root = NULL;
 516        }
 517
 518        kill_block_super(s);
 519}
 520
 521static void reiserfs_put_super(struct super_block *s)
 522{
 523        struct reiserfs_transaction_handle th;
 524        th.t_trans_id = 0;
 525
 526        dquot_disable(s, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
 527
 528        reiserfs_write_lock(s);
 529
 530        /* change file system state to current state if it was mounted with read-write permissions */
 531        if (!(s->s_flags & MS_RDONLY)) {
 532                if (!journal_begin(&th, s, 10)) {
 533                        reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
 534                                                     1);
 535                        set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
 536                                            REISERFS_SB(s)->s_mount_state);
 537                        journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
 538                }
 539        }
 540
 541        /* note, journal_release checks for readonly mount, and can decide not
 542         ** to do a journal_end
 543         */
 544        journal_release(&th, s);
 545
 546        reiserfs_free_bitmap_cache(s);
 547
 548        brelse(SB_BUFFER_WITH_SB(s));
 549
 550        print_statistics(s);
 551
 552        if (REISERFS_SB(s)->reserved_blocks != 0) {
 553                reiserfs_warning(s, "green-2005", "reserved blocks left %d",
 554                                 REISERFS_SB(s)->reserved_blocks);
 555        }
 556
 557        reiserfs_proc_info_done(s);
 558
 559        reiserfs_write_unlock(s);
 560        mutex_destroy(&REISERFS_SB(s)->lock);
 561        kfree(s->s_fs_info);
 562        s->s_fs_info = NULL;
 563}
 564
 565static struct kmem_cache *reiserfs_inode_cachep;
 566
 567static struct inode *reiserfs_alloc_inode(struct super_block *sb)
 568{
 569        struct reiserfs_inode_info *ei;
 570        ei = (struct reiserfs_inode_info *)
 571            kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
 572        if (!ei)
 573                return NULL;
 574        atomic_set(&ei->openers, 0);
 575        mutex_init(&ei->tailpack);
 576        return &ei->vfs_inode;
 577}
 578
 579static void reiserfs_i_callback(struct rcu_head *head)
 580{
 581        struct inode *inode = container_of(head, struct inode, i_rcu);
 582        kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
 583}
 584
 585static void reiserfs_destroy_inode(struct inode *inode)
 586{
 587        call_rcu(&inode->i_rcu, reiserfs_i_callback);
 588}
 589
 590static void init_once(void *foo)
 591{
 592        struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
 593
 594        INIT_LIST_HEAD(&ei->i_prealloc_list);
 595        inode_init_once(&ei->vfs_inode);
 596}
 597
 598static int init_inodecache(void)
 599{
 600        reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
 601                                                  sizeof(struct
 602                                                         reiserfs_inode_info),
 603                                                  0, (SLAB_RECLAIM_ACCOUNT|
 604                                                        SLAB_MEM_SPREAD),
 605                                                  init_once);
 606        if (reiserfs_inode_cachep == NULL)
 607                return -ENOMEM;
 608        return 0;
 609}
 610
 611static void destroy_inodecache(void)
 612{
 613        /*
 614         * Make sure all delayed rcu free inodes are flushed before we
 615         * destroy cache.
 616         */
 617        rcu_barrier();
 618        kmem_cache_destroy(reiserfs_inode_cachep);
 619}
 620
 621/* we don't mark inodes dirty, we just log them */
 622static void reiserfs_dirty_inode(struct inode *inode, int flags)
 623{
 624        struct reiserfs_transaction_handle th;
 625
 626        int err = 0;
 627        int lock_depth;
 628
 629        if (inode->i_sb->s_flags & MS_RDONLY) {
 630                reiserfs_warning(inode->i_sb, "clm-6006",
 631                                 "writing inode %lu on readonly FS",
 632                                 inode->i_ino);
 633                return;
 634        }
 635        lock_depth = reiserfs_write_lock_once(inode->i_sb);
 636
 637        /* this is really only used for atime updates, so they don't have
 638         ** to be included in O_SYNC or fsync
 639         */
 640        err = journal_begin(&th, inode->i_sb, 1);
 641        if (err)
 642                goto out;
 643
 644        reiserfs_update_sd(&th, inode);
 645        journal_end(&th, inode->i_sb, 1);
 646
 647out:
 648        reiserfs_write_unlock_once(inode->i_sb, lock_depth);
 649}
 650
 651static int reiserfs_show_options(struct seq_file *seq, struct dentry *root)
 652{
 653        struct super_block *s = root->d_sb;
 654        struct reiserfs_journal *journal = SB_JOURNAL(s);
 655        long opts = REISERFS_SB(s)->s_mount_opt;
 656
 657        if (opts & (1 << REISERFS_LARGETAIL))
 658                seq_puts(seq, ",tails=on");
 659        else if (!(opts & (1 << REISERFS_SMALLTAIL)))
 660                seq_puts(seq, ",notail");
 661        /* tails=small is default so we don't show it */
 662
 663        if (!(opts & (1 << REISERFS_BARRIER_FLUSH)))
 664                seq_puts(seq, ",barrier=none");
 665        /* barrier=flush is default so we don't show it */
 666
 667        if (opts & (1 << REISERFS_ERROR_CONTINUE))
 668                seq_puts(seq, ",errors=continue");
 669        else if (opts & (1 << REISERFS_ERROR_PANIC))
 670                seq_puts(seq, ",errors=panic");
 671        /* errors=ro is default so we don't show it */
 672
 673        if (opts & (1 << REISERFS_DATA_LOG))
 674                seq_puts(seq, ",data=journal");
 675        else if (opts & (1 << REISERFS_DATA_WRITEBACK))
 676                seq_puts(seq, ",data=writeback");
 677        /* data=ordered is default so we don't show it */
 678
 679        if (opts & (1 << REISERFS_ATTRS))
 680                seq_puts(seq, ",attrs");
 681
 682        if (opts & (1 << REISERFS_XATTRS_USER))
 683                seq_puts(seq, ",user_xattr");
 684
 685        if (opts & (1 << REISERFS_EXPOSE_PRIVROOT))
 686                seq_puts(seq, ",expose_privroot");
 687
 688        if (opts & (1 << REISERFS_POSIXACL))
 689                seq_puts(seq, ",acl");
 690
 691        if (REISERFS_SB(s)->s_jdev)
 692                seq_printf(seq, ",jdev=%s", REISERFS_SB(s)->s_jdev);
 693
 694        if (journal->j_max_commit_age != journal->j_default_max_commit_age)
 695                seq_printf(seq, ",commit=%d", journal->j_max_commit_age);
 696
 697#ifdef CONFIG_QUOTA
 698        if (REISERFS_SB(s)->s_qf_names[USRQUOTA])
 699                seq_printf(seq, ",usrjquota=%s", REISERFS_SB(s)->s_qf_names[USRQUOTA]);
 700        else if (opts & (1 << REISERFS_USRQUOTA))
 701                seq_puts(seq, ",usrquota");
 702        if (REISERFS_SB(s)->s_qf_names[GRPQUOTA])
 703                seq_printf(seq, ",grpjquota=%s", REISERFS_SB(s)->s_qf_names[GRPQUOTA]);
 704        else if (opts & (1 << REISERFS_GRPQUOTA))
 705                seq_puts(seq, ",grpquota");
 706        if (REISERFS_SB(s)->s_jquota_fmt) {
 707                if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_OLD)
 708                        seq_puts(seq, ",jqfmt=vfsold");
 709                else if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_V0)
 710                        seq_puts(seq, ",jqfmt=vfsv0");
 711        }
 712#endif
 713
 714        /* Block allocator options */
 715        if (opts & (1 << REISERFS_NO_BORDER))
 716                seq_puts(seq, ",block-allocator=noborder");
 717        if (opts & (1 << REISERFS_NO_UNHASHED_RELOCATION))
 718                seq_puts(seq, ",block-allocator=no_unhashed_relocation");
 719        if (opts & (1 << REISERFS_HASHED_RELOCATION))
 720                seq_puts(seq, ",block-allocator=hashed_relocation");
 721        if (opts & (1 << REISERFS_TEST4))
 722                seq_puts(seq, ",block-allocator=test4");
 723        show_alloc_options(seq, s);
 724        return 0;
 725}
 726
 727#ifdef CONFIG_QUOTA
 728static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
 729                                    size_t, loff_t);
 730static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
 731                                   loff_t);
 732#endif
 733
 734static const struct super_operations reiserfs_sops = {
 735        .alloc_inode = reiserfs_alloc_inode,
 736        .destroy_inode = reiserfs_destroy_inode,
 737        .write_inode = reiserfs_write_inode,
 738        .dirty_inode = reiserfs_dirty_inode,
 739        .evict_inode = reiserfs_evict_inode,
 740        .put_super = reiserfs_put_super,
 741        .sync_fs = reiserfs_sync_fs,
 742        .freeze_fs = reiserfs_freeze,
 743        .unfreeze_fs = reiserfs_unfreeze,
 744        .statfs = reiserfs_statfs,
 745        .remount_fs = reiserfs_remount,
 746        .show_options = reiserfs_show_options,
 747#ifdef CONFIG_QUOTA
 748        .quota_read = reiserfs_quota_read,
 749        .quota_write = reiserfs_quota_write,
 750#endif
 751};
 752
 753#ifdef CONFIG_QUOTA
 754#define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
 755
 756static int reiserfs_write_dquot(struct dquot *);
 757static int reiserfs_acquire_dquot(struct dquot *);
 758static int reiserfs_release_dquot(struct dquot *);
 759static int reiserfs_mark_dquot_dirty(struct dquot *);
 760static int reiserfs_write_info(struct super_block *, int);
 761static int reiserfs_quota_on(struct super_block *, int, int, struct path *);
 762
 763static const struct dquot_operations reiserfs_quota_operations = {
 764        .write_dquot = reiserfs_write_dquot,
 765        .acquire_dquot = reiserfs_acquire_dquot,
 766        .release_dquot = reiserfs_release_dquot,
 767        .mark_dirty = reiserfs_mark_dquot_dirty,
 768        .write_info = reiserfs_write_info,
 769        .alloc_dquot    = dquot_alloc,
 770        .destroy_dquot  = dquot_destroy,
 771};
 772
 773static const struct quotactl_ops reiserfs_qctl_operations = {
 774        .quota_on = reiserfs_quota_on,
 775        .quota_off = dquot_quota_off,
 776        .quota_sync = dquot_quota_sync,
 777        .get_info = dquot_get_dqinfo,
 778        .set_info = dquot_set_dqinfo,
 779        .get_dqblk = dquot_get_dqblk,
 780        .set_dqblk = dquot_set_dqblk,
 781};
 782#endif
 783
 784static const struct export_operations reiserfs_export_ops = {
 785        .encode_fh = reiserfs_encode_fh,
 786        .fh_to_dentry = reiserfs_fh_to_dentry,
 787        .fh_to_parent = reiserfs_fh_to_parent,
 788        .get_parent = reiserfs_get_parent,
 789};
 790
 791/* this struct is used in reiserfs_getopt () for containing the value for those
 792   mount options that have values rather than being toggles. */
 793typedef struct {
 794        char *value;
 795        int setmask;            /* bitmask which is to set on mount_options bitmask when this
 796                                   value is found, 0 is no bits are to be changed. */
 797        int clrmask;            /* bitmask which is to clear on mount_options bitmask when  this
 798                                   value is found, 0 is no bits are to be changed. This is
 799                                   applied BEFORE setmask */
 800} arg_desc_t;
 801
 802/* Set this bit in arg_required to allow empty arguments */
 803#define REISERFS_OPT_ALLOWEMPTY 31
 804
 805/* this struct is used in reiserfs_getopt() for describing the set of reiserfs
 806   mount options */
 807typedef struct {
 808        char *option_name;
 809        int arg_required;       /* 0 if argument is not required, not 0 otherwise */
 810        const arg_desc_t *values;       /* list of values accepted by an option */
 811        int setmask;            /* bitmask which is to set on mount_options bitmask when this
 812                                   value is found, 0 is no bits are to be changed. */
 813        int clrmask;            /* bitmask which is to clear on mount_options bitmask when  this
 814                                   value is found, 0 is no bits are to be changed. This is
 815                                   applied BEFORE setmask */
 816} opt_desc_t;
 817
 818/* possible values for -o data= */
 819static const arg_desc_t logging_mode[] = {
 820        {"ordered", 1 << REISERFS_DATA_ORDERED,
 821         (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
 822        {"journal", 1 << REISERFS_DATA_LOG,
 823         (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
 824        {"writeback", 1 << REISERFS_DATA_WRITEBACK,
 825         (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
 826        {.value = NULL}
 827};
 828
 829/* possible values for -o barrier= */
 830static const arg_desc_t barrier_mode[] = {
 831        {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
 832        {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
 833        {.value = NULL}
 834};
 835
 836/* possible values for "-o block-allocator=" and bits which are to be set in
 837   s_mount_opt of reiserfs specific part of in-core super block */
 838static const arg_desc_t balloc[] = {
 839        {"noborder", 1 << REISERFS_NO_BORDER, 0},
 840        {"border", 0, 1 << REISERFS_NO_BORDER},
 841        {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
 842        {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
 843        {"test4", 1 << REISERFS_TEST4, 0},
 844        {"notest4", 0, 1 << REISERFS_TEST4},
 845        {NULL, 0, 0}
 846};
 847
 848static const arg_desc_t tails[] = {
 849        {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
 850        {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
 851        {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
 852        {NULL, 0, 0}
 853};
 854
 855static const arg_desc_t error_actions[] = {
 856        {"panic", 1 << REISERFS_ERROR_PANIC,
 857         (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
 858        {"ro-remount", 1 << REISERFS_ERROR_RO,
 859         (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
 860#ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
 861        {"continue", 1 << REISERFS_ERROR_CONTINUE,
 862         (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
 863#endif
 864        {NULL, 0, 0},
 865};
 866
 867/* proceed only one option from a list *cur - string containing of mount options
 868   opts - array of options which are accepted
 869   opt_arg - if option is found and requires an argument and if it is specifed
 870   in the input - pointer to the argument is stored here
 871   bit_flags - if option requires to set a certain bit - it is set here
 872   return -1 if unknown option is found, opt->arg_required otherwise */
 873static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
 874                           char **opt_arg, unsigned long *bit_flags)
 875{
 876        char *p;
 877        /* foo=bar,
 878           ^   ^  ^
 879           |   |  +-- option_end
 880           |   +-- arg_start
 881           +-- option_start
 882         */
 883        const opt_desc_t *opt;
 884        const arg_desc_t *arg;
 885
 886        p = *cur;
 887
 888        /* assume argument cannot contain commas */
 889        *cur = strchr(p, ',');
 890        if (*cur) {
 891                *(*cur) = '\0';
 892                (*cur)++;
 893        }
 894
 895        if (!strncmp(p, "alloc=", 6)) {
 896                /* Ugly special case, probably we should redo options parser so that
 897                   it can understand several arguments for some options, also so that
 898                   it can fill several bitfields with option values. */
 899                if (reiserfs_parse_alloc_options(s, p + 6)) {
 900                        return -1;
 901                } else {
 902                        return 0;
 903                }
 904        }
 905
 906        /* for every option in the list */
 907        for (opt = opts; opt->option_name; opt++) {
 908                if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
 909                        if (bit_flags) {
 910                                if (opt->clrmask ==
 911                                    (1 << REISERFS_UNSUPPORTED_OPT))
 912                                        reiserfs_warning(s, "super-6500",
 913                                                         "%s not supported.\n",
 914                                                         p);
 915                                else
 916                                        *bit_flags &= ~opt->clrmask;
 917                                if (opt->setmask ==
 918                                    (1 << REISERFS_UNSUPPORTED_OPT))
 919                                        reiserfs_warning(s, "super-6501",
 920                                                         "%s not supported.\n",
 921                                                         p);
 922                                else
 923                                        *bit_flags |= opt->setmask;
 924                        }
 925                        break;
 926                }
 927        }
 928        if (!opt->option_name) {
 929                reiserfs_warning(s, "super-6502",
 930                                 "unknown mount option \"%s\"", p);
 931                return -1;
 932        }
 933
 934        p += strlen(opt->option_name);
 935        switch (*p) {
 936        case '=':
 937                if (!opt->arg_required) {
 938                        reiserfs_warning(s, "super-6503",
 939                                         "the option \"%s\" does not "
 940                                         "require an argument\n",
 941                                         opt->option_name);
 942                        return -1;
 943                }
 944                break;
 945
 946        case 0:
 947                if (opt->arg_required) {
 948                        reiserfs_warning(s, "super-6504",
 949                                         "the option \"%s\" requires an "
 950                                         "argument\n", opt->option_name);
 951                        return -1;
 952                }
 953                break;
 954        default:
 955                reiserfs_warning(s, "super-6505",
 956                                 "head of option \"%s\" is only correct\n",
 957                                 opt->option_name);
 958                return -1;
 959        }
 960
 961        /* move to the argument, or to next option if argument is not required */
 962        p++;
 963
 964        if (opt->arg_required
 965            && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
 966            && !strlen(p)) {
 967                /* this catches "option=," if not allowed */
 968                reiserfs_warning(s, "super-6506",
 969                                 "empty argument for \"%s\"\n",
 970                                 opt->option_name);
 971                return -1;
 972        }
 973
 974        if (!opt->values) {
 975                /* *=NULLopt_arg contains pointer to argument */
 976                *opt_arg = p;
 977                return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
 978        }
 979
 980        /* values possible for this option are listed in opt->values */
 981        for (arg = opt->values; arg->value; arg++) {
 982                if (!strcmp(p, arg->value)) {
 983                        if (bit_flags) {
 984                                *bit_flags &= ~arg->clrmask;
 985                                *bit_flags |= arg->setmask;
 986                        }
 987                        return opt->arg_required;
 988                }
 989        }
 990
 991        reiserfs_warning(s, "super-6506",
 992                         "bad value \"%s\" for option \"%s\"\n", p,
 993                         opt->option_name);
 994        return -1;
 995}
 996
 997/* returns 0 if something is wrong in option string, 1 - otherwise */
 998static int reiserfs_parse_options(struct super_block *s, char *options, /* string given via mount's -o */
 999                                  unsigned long *mount_options,
1000                                  /* after the parsing phase, contains the
1001                                     collection of bitflags defining what
1002                                     mount options were selected. */
1003                                  unsigned long *blocks,        /* strtol-ed from NNN of resize=NNN */
1004                                  char **jdev_name,
1005                                  unsigned int *commit_max_age,
1006                                  char **qf_names,
1007                                  unsigned int *qfmt)
1008{
1009        int c;
1010        char *arg = NULL;
1011        char *pos;
1012        opt_desc_t opts[] = {
1013                /* Compatibility stuff, so that -o notail for old setups still work */
1014                {"tails",.arg_required = 't',.values = tails},
1015                {"notail",.clrmask =
1016                 (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
1017                {"conv",.setmask = 1 << REISERFS_CONVERT},
1018                {"attrs",.setmask = 1 << REISERFS_ATTRS},
1019                {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
1020                {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
1021#ifdef CONFIG_REISERFS_FS_XATTR
1022                {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
1023                {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
1024#else
1025                {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1026                {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1027#endif
1028#ifdef CONFIG_REISERFS_FS_POSIX_ACL
1029                {"acl",.setmask = 1 << REISERFS_POSIXACL},
1030                {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
1031#else
1032                {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
1033                {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
1034#endif
1035                {.option_name = "nolog"},
1036                {"replayonly",.setmask = 1 << REPLAYONLY},
1037                {"block-allocator",.arg_required = 'a',.values = balloc},
1038                {"data",.arg_required = 'd',.values = logging_mode},
1039                {"barrier",.arg_required = 'b',.values = barrier_mode},
1040                {"resize",.arg_required = 'r',.values = NULL},
1041                {"jdev",.arg_required = 'j',.values = NULL},
1042                {"nolargeio",.arg_required = 'w',.values = NULL},
1043                {"commit",.arg_required = 'c',.values = NULL},
1044                {"usrquota",.setmask = 1 << REISERFS_USRQUOTA},
1045                {"grpquota",.setmask = 1 << REISERFS_GRPQUOTA},
1046                {"noquota",.clrmask = 1 << REISERFS_USRQUOTA | 1 << REISERFS_GRPQUOTA},
1047                {"errors",.arg_required = 'e',.values = error_actions},
1048                {"usrjquota",.arg_required =
1049                 'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1050                {"grpjquota",.arg_required =
1051                 'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
1052                {"jqfmt",.arg_required = 'f',.values = NULL},
1053                {.option_name = NULL}
1054        };
1055
1056        *blocks = 0;
1057        if (!options || !*options)
1058                /* use default configuration: create tails, journaling on, no
1059                   conversion to newest format */
1060                return 1;
1061
1062        for (pos = options; pos;) {
1063                c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
1064                if (c == -1)
1065                        /* wrong option is given */
1066                        return 0;
1067
1068                if (c == 'r') {
1069                        char *p;
1070
1071                        p = NULL;
1072                        /* "resize=NNN" or "resize=auto" */
1073
1074                        if (!strcmp(arg, "auto")) {
1075                                /* From JFS code, to auto-get the size. */
1076                                *blocks =
1077                                    s->s_bdev->bd_inode->i_size >> s->
1078                                    s_blocksize_bits;
1079                        } else {
1080                                *blocks = simple_strtoul(arg, &p, 0);
1081                                if (*p != '\0') {
1082                                        /* NNN does not look like a number */
1083                                        reiserfs_warning(s, "super-6507",
1084                                                         "bad value %s for "
1085                                                         "-oresize\n", arg);
1086                                        return 0;
1087                                }
1088                        }
1089                }
1090
1091                if (c == 'c') {
1092                        char *p = NULL;
1093                        unsigned long val = simple_strtoul(arg, &p, 0);
1094                        /* commit=NNN (time in seconds) */
1095                        if (*p != '\0' || val >= (unsigned int)-1) {
1096                                reiserfs_warning(s, "super-6508",
1097                                                 "bad value %s for -ocommit\n",
1098                                                 arg);
1099                                return 0;
1100                        }
1101                        *commit_max_age = (unsigned int)val;
1102                }
1103
1104                if (c == 'w') {
1105                        reiserfs_warning(s, "super-6509", "nolargeio option "
1106                                         "is no longer supported");
1107                        return 0;
1108                }
1109
1110                if (c == 'j') {
1111                        if (arg && *arg && jdev_name) {
1112                                if (*jdev_name) {       //Hm, already assigned?
1113                                        reiserfs_warning(s, "super-6510",
1114                                                         "journal device was "
1115                                                         "already specified to "
1116                                                         "be %s", *jdev_name);
1117                                        return 0;
1118                                }
1119                                *jdev_name = arg;
1120                        }
1121                }
1122#ifdef CONFIG_QUOTA
1123                if (c == 'u' || c == 'g') {
1124                        int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
1125
1126                        if (sb_any_quota_loaded(s) &&
1127                            (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
1128                                reiserfs_warning(s, "super-6511",
1129                                                 "cannot change journaled "
1130                                                 "quota options when quota "
1131                                                 "turned on.");
1132                                return 0;
1133                        }
1134                        if (*arg) {     /* Some filename specified? */
1135                                if (REISERFS_SB(s)->s_qf_names[qtype]
1136                                    && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
1137                                              arg)) {
1138                                        reiserfs_warning(s, "super-6512",
1139                                                         "%s quota file "
1140                                                         "already specified.",
1141                                                         QTYPE2NAME(qtype));
1142                                        return 0;
1143                                }
1144                                if (strchr(arg, '/')) {
1145                                        reiserfs_warning(s, "super-6513",
1146                                                         "quotafile must be "
1147                                                         "on filesystem root.");
1148                                        return 0;
1149                                }
1150                                qf_names[qtype] =
1151                                    kmalloc(strlen(arg) + 1, GFP_KERNEL);
1152                                if (!qf_names[qtype]) {
1153                                        reiserfs_warning(s, "reiserfs-2502",
1154                                                         "not enough memory "
1155                                                         "for storing "
1156                                                         "quotafile name.");
1157                                        return 0;
1158                                }
1159                                strcpy(qf_names[qtype], arg);
1160                                if (qtype == USRQUOTA)
1161                                        *mount_options |= 1 << REISERFS_USRQUOTA;
1162                                else
1163                                        *mount_options |= 1 << REISERFS_GRPQUOTA;
1164                        } else {
1165                                if (qf_names[qtype] !=
1166                                    REISERFS_SB(s)->s_qf_names[qtype])
1167                                        kfree(qf_names[qtype]);
1168                                qf_names[qtype] = NULL;
1169                                if (qtype == USRQUOTA)
1170                                        *mount_options &= ~(1 << REISERFS_USRQUOTA);
1171                                else
1172                                        *mount_options &= ~(1 << REISERFS_GRPQUOTA);
1173                        }
1174                }
1175                if (c == 'f') {
1176                        if (!strcmp(arg, "vfsold"))
1177                                *qfmt = QFMT_VFS_OLD;
1178                        else if (!strcmp(arg, "vfsv0"))
1179                                *qfmt = QFMT_VFS_V0;
1180                        else {
1181                                reiserfs_warning(s, "super-6514",
1182                                                 "unknown quota format "
1183                                                 "specified.");
1184                                return 0;
1185                        }
1186                        if (sb_any_quota_loaded(s) &&
1187                            *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
1188                                reiserfs_warning(s, "super-6515",
1189                                                 "cannot change journaled "
1190                                                 "quota options when quota "
1191                                                 "turned on.");
1192                                return 0;
1193                        }
1194                }
1195#else
1196                if (c == 'u' || c == 'g' || c == 'f') {
1197                        reiserfs_warning(s, "reiserfs-2503", "journaled "
1198                                         "quota options not supported.");
1199                        return 0;
1200                }
1201#endif
1202        }
1203
1204#ifdef CONFIG_QUOTA
1205        if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
1206            && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
1207                reiserfs_warning(s, "super-6515",
1208                                 "journaled quota format not specified.");
1209                return 0;
1210        }
1211        if ((!(*mount_options & (1 << REISERFS_USRQUOTA)) &&
1212               sb_has_quota_loaded(s, USRQUOTA)) ||
1213            (!(*mount_options & (1 << REISERFS_GRPQUOTA)) &&
1214               sb_has_quota_loaded(s, GRPQUOTA))) {
1215                reiserfs_warning(s, "super-6516", "quota options must "
1216                                 "be present when quota is turned on.");
1217                return 0;
1218        }
1219#endif
1220
1221        return 1;
1222}
1223
1224static void switch_data_mode(struct super_block *s, unsigned long mode)
1225{
1226        REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
1227                                         (1 << REISERFS_DATA_ORDERED) |
1228                                         (1 << REISERFS_DATA_WRITEBACK));
1229        REISERFS_SB(s)->s_mount_opt |= (1 << mode);
1230}
1231
1232static void handle_data_mode(struct super_block *s, unsigned long mount_options)
1233{
1234        if (mount_options & (1 << REISERFS_DATA_LOG)) {
1235                if (!reiserfs_data_log(s)) {
1236                        switch_data_mode(s, REISERFS_DATA_LOG);
1237                        reiserfs_info(s, "switching to journaled data mode\n");
1238                }
1239        } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
1240                if (!reiserfs_data_ordered(s)) {
1241                        switch_data_mode(s, REISERFS_DATA_ORDERED);
1242                        reiserfs_info(s, "switching to ordered data mode\n");
1243                }
1244        } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
1245                if (!reiserfs_data_writeback(s)) {
1246                        switch_data_mode(s, REISERFS_DATA_WRITEBACK);
1247                        reiserfs_info(s, "switching to writeback data mode\n");
1248                }
1249        }
1250}
1251
1252static void handle_barrier_mode(struct super_block *s, unsigned long bits)
1253{
1254        int flush = (1 << REISERFS_BARRIER_FLUSH);
1255        int none = (1 << REISERFS_BARRIER_NONE);
1256        int all_barrier = flush | none;
1257
1258        if (bits & all_barrier) {
1259                REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
1260                if (bits & flush) {
1261                        REISERFS_SB(s)->s_mount_opt |= flush;
1262                        printk("reiserfs: enabling write barrier flush mode\n");
1263                } else if (bits & none) {
1264                        REISERFS_SB(s)->s_mount_opt |= none;
1265                        printk("reiserfs: write barriers turned off\n");
1266                }
1267        }
1268}
1269
1270static void handle_attrs(struct super_block *s)
1271{
1272        struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
1273
1274        if (reiserfs_attrs(s)) {
1275                if (old_format_only(s)) {
1276                        reiserfs_warning(s, "super-6517", "cannot support "
1277                                         "attributes on 3.5.x disk format");
1278                        REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1279                        return;
1280                }
1281                if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
1282                        reiserfs_warning(s, "super-6518", "cannot support "
1283                                         "attributes until flag is set in "
1284                                         "super-block");
1285                        REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
1286                }
1287        }
1288}
1289
1290#ifdef CONFIG_QUOTA
1291static void handle_quota_files(struct super_block *s, char **qf_names,
1292                               unsigned int *qfmt)
1293{
1294        int i;
1295
1296        for (i = 0; i < MAXQUOTAS; i++) {
1297                if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1298                        kfree(REISERFS_SB(s)->s_qf_names[i]);
1299                REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
1300        }
1301        if (*qfmt)
1302                REISERFS_SB(s)->s_jquota_fmt = *qfmt;
1303}
1304#endif
1305
1306static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
1307{
1308        struct reiserfs_super_block *rs;
1309        struct reiserfs_transaction_handle th;
1310        unsigned long blocks;
1311        unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
1312        unsigned long safe_mask = 0;
1313        unsigned int commit_max_age = (unsigned int)-1;
1314        struct reiserfs_journal *journal = SB_JOURNAL(s);
1315        char *new_opts = kstrdup(arg, GFP_KERNEL);
1316        int err;
1317        char *qf_names[MAXQUOTAS];
1318        unsigned int qfmt = 0;
1319#ifdef CONFIG_QUOTA
1320        int i;
1321#endif
1322
1323        reiserfs_write_lock(s);
1324
1325#ifdef CONFIG_QUOTA
1326        memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
1327#endif
1328
1329        rs = SB_DISK_SUPER_BLOCK(s);
1330
1331        if (!reiserfs_parse_options
1332            (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
1333            qf_names, &qfmt)) {
1334#ifdef CONFIG_QUOTA
1335                for (i = 0; i < MAXQUOTAS; i++)
1336                        if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
1337                                kfree(qf_names[i]);
1338#endif
1339                err = -EINVAL;
1340                goto out_unlock;
1341        }
1342#ifdef CONFIG_QUOTA
1343        handle_quota_files(s, qf_names, &qfmt);
1344#endif
1345
1346        handle_attrs(s);
1347
1348        /* Add options that are safe here */
1349        safe_mask |= 1 << REISERFS_SMALLTAIL;
1350        safe_mask |= 1 << REISERFS_LARGETAIL;
1351        safe_mask |= 1 << REISERFS_NO_BORDER;
1352        safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
1353        safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
1354        safe_mask |= 1 << REISERFS_TEST4;
1355        safe_mask |= 1 << REISERFS_ATTRS;
1356        safe_mask |= 1 << REISERFS_XATTRS_USER;
1357        safe_mask |= 1 << REISERFS_POSIXACL;
1358        safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
1359        safe_mask |= 1 << REISERFS_BARRIER_NONE;
1360        safe_mask |= 1 << REISERFS_ERROR_RO;
1361        safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
1362        safe_mask |= 1 << REISERFS_ERROR_PANIC;
1363        safe_mask |= 1 << REISERFS_USRQUOTA;
1364        safe_mask |= 1 << REISERFS_GRPQUOTA;
1365
1366        /* Update the bitmask, taking care to keep
1367         * the bits we're not allowed to change here */
1368        REISERFS_SB(s)->s_mount_opt =
1369            (REISERFS_SB(s)->
1370             s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
1371
1372        if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
1373                journal->j_max_commit_age = commit_max_age;
1374                journal->j_max_trans_age = commit_max_age;
1375        } else if (commit_max_age == 0) {
1376                /* 0 means restore defaults. */
1377                journal->j_max_commit_age = journal->j_default_max_commit_age;
1378                journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
1379        }
1380
1381        if (blocks) {
1382                err = reiserfs_resize(s, blocks);
1383                if (err != 0)
1384                        goto out_unlock;
1385        }
1386
1387        if (*mount_flags & MS_RDONLY) {
1388                reiserfs_xattr_init(s, *mount_flags);
1389                /* remount read-only */
1390                if (s->s_flags & MS_RDONLY)
1391                        /* it is read-only already */
1392                        goto out_ok;
1393
1394                /*
1395                 * Drop write lock. Quota will retake it when needed and lock
1396                 * ordering requires calling dquot_suspend() without it.
1397                 */
1398                reiserfs_write_unlock(s);
1399                err = dquot_suspend(s, -1);
1400                if (err < 0)
1401                        goto out_err;
1402                reiserfs_write_lock(s);
1403
1404                /* try to remount file system with read-only permissions */
1405                if (sb_umount_state(rs) == REISERFS_VALID_FS
1406                    || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
1407                        goto out_ok;
1408                }
1409
1410                err = journal_begin(&th, s, 10);
1411                if (err)
1412                        goto out_unlock;
1413
1414                /* Mounting a rw partition read-only. */
1415                reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1416                set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
1417                journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1418        } else {
1419                /* remount read-write */
1420                if (!(s->s_flags & MS_RDONLY)) {
1421                        reiserfs_xattr_init(s, *mount_flags);
1422                        goto out_ok;    /* We are read-write already */
1423                }
1424
1425                if (reiserfs_is_journal_aborted(journal)) {
1426                        err = journal->j_errno;
1427                        goto out_unlock;
1428                }
1429
1430                handle_data_mode(s, mount_options);
1431                handle_barrier_mode(s, mount_options);
1432                REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1433                s->s_flags &= ~MS_RDONLY;       /* now it is safe to call journal_begin */
1434                err = journal_begin(&th, s, 10);
1435                if (err)
1436                        goto out_unlock;
1437
1438                /* Mount a partition which is read-only, read-write */
1439                reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1440                REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
1441                s->s_flags &= ~MS_RDONLY;
1442                set_sb_umount_state(rs, REISERFS_ERROR_FS);
1443                if (!old_format_only(s))
1444                        set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
1445                /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
1446                journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
1447                REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
1448        }
1449        /* this will force a full flush of all journal lists */
1450        SB_JOURNAL(s)->j_must_wait = 1;
1451        err = journal_end(&th, s, 10);
1452        if (err)
1453                goto out_unlock;
1454
1455        if (!(*mount_flags & MS_RDONLY)) {
1456                /*
1457                 * Drop write lock. Quota will retake it when needed and lock
1458                 * ordering requires calling dquot_resume() without it.
1459                 */
1460                reiserfs_write_unlock(s);
1461                dquot_resume(s, -1);
1462                reiserfs_write_lock(s);
1463                finish_unfinished(s);
1464                reiserfs_xattr_init(s, *mount_flags);
1465        }
1466
1467out_ok:
1468        replace_mount_options(s, new_opts);
1469        reiserfs_write_unlock(s);
1470        return 0;
1471
1472out_unlock:
1473        reiserfs_write_unlock(s);
1474out_err:
1475        kfree(new_opts);
1476        return err;
1477}
1478
1479static int read_super_block(struct super_block *s, int offset)
1480{
1481        struct buffer_head *bh;
1482        struct reiserfs_super_block *rs;
1483        int fs_blocksize;
1484
1485        bh = sb_bread(s, offset / s->s_blocksize);
1486        if (!bh) {
1487                reiserfs_warning(s, "sh-2006",
1488                                 "bread failed (dev %s, block %lu, size %lu)",
1489                                 reiserfs_bdevname(s), offset / s->s_blocksize,
1490                                 s->s_blocksize);
1491                return 1;
1492        }
1493
1494        rs = (struct reiserfs_super_block *)bh->b_data;
1495        if (!is_any_reiserfs_magic_string(rs)) {
1496                brelse(bh);
1497                return 1;
1498        }
1499        //
1500        // ok, reiserfs signature (old or new) found in at the given offset
1501        //
1502        fs_blocksize = sb_blocksize(rs);
1503        brelse(bh);
1504        sb_set_blocksize(s, fs_blocksize);
1505
1506        bh = sb_bread(s, offset / s->s_blocksize);
1507        if (!bh) {
1508                reiserfs_warning(s, "sh-2007",
1509                                 "bread failed (dev %s, block %lu, size %lu)",
1510                                 reiserfs_bdevname(s), offset / s->s_blocksize,
1511                                 s->s_blocksize);
1512                return 1;
1513        }
1514
1515        rs = (struct reiserfs_super_block *)bh->b_data;
1516        if (sb_blocksize(rs) != s->s_blocksize) {
1517                reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
1518                                 "filesystem on (dev %s, block %Lu, size %lu)",
1519                                 reiserfs_bdevname(s),
1520                                 (unsigned long long)bh->b_blocknr,
1521                                 s->s_blocksize);
1522                brelse(bh);
1523                return 1;
1524        }
1525
1526        if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
1527                brelse(bh);
1528                reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
1529                                 "--rebuild-tree run detected. Please run\n"
1530                                 "reiserfsck --rebuild-tree and wait for a "
1531                                 "completion. If that fails\n"
1532                                 "get newer reiserfsprogs package");
1533                return 1;
1534        }
1535
1536        SB_BUFFER_WITH_SB(s) = bh;
1537        SB_DISK_SUPER_BLOCK(s) = rs;
1538
1539        if (is_reiserfs_jr(rs)) {
1540                /* magic is of non-standard journal filesystem, look at s_version to
1541                   find which format is in use */
1542                if (sb_version(rs) == REISERFS_VERSION_2)
1543                        reiserfs_info(s, "found reiserfs format \"3.6\""
1544                                      " with non-standard journal\n");
1545                else if (sb_version(rs) == REISERFS_VERSION_1)
1546                        reiserfs_info(s, "found reiserfs format \"3.5\""
1547                                      " with non-standard journal\n");
1548                else {
1549                        reiserfs_warning(s, "sh-2012", "found unknown "
1550                                         "format \"%u\" of reiserfs with "
1551                                         "non-standard magic", sb_version(rs));
1552                        return 1;
1553                }
1554        } else
1555                /* s_version of standard format may contain incorrect information,
1556                   so we just look at the magic string */
1557                reiserfs_info(s,
1558                              "found reiserfs format \"%s\" with standard journal\n",
1559                              is_reiserfs_3_5(rs) ? "3.5" : "3.6");
1560
1561        s->s_op = &reiserfs_sops;
1562        s->s_export_op = &reiserfs_export_ops;
1563#ifdef CONFIG_QUOTA
1564        s->s_qcop = &reiserfs_qctl_operations;
1565        s->dq_op = &reiserfs_quota_operations;
1566#endif
1567
1568        /* new format is limited by the 32 bit wide i_blocks field, want to
1569         ** be one full block below that.
1570         */
1571        s->s_maxbytes = (512LL << 32) - s->s_blocksize;
1572        return 0;
1573}
1574
1575/* after journal replay, reread all bitmap and super blocks */
1576static int reread_meta_blocks(struct super_block *s)
1577{
1578        ll_rw_block(READ, 1, &(SB_BUFFER_WITH_SB(s)));
1579        wait_on_buffer(SB_BUFFER_WITH_SB(s));
1580        if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
1581                reiserfs_warning(s, "reiserfs-2504", "error reading the super");
1582                return 1;
1583        }
1584
1585        return 0;
1586}
1587
1588/////////////////////////////////////////////////////
1589// hash detection stuff
1590
1591// if root directory is empty - we set default - Yura's - hash and
1592// warn about it
1593// FIXME: we look for only one name in a directory. If tea and yura
1594// bith have the same value - we ask user to send report to the
1595// mailing list
1596static __u32 find_hash_out(struct super_block *s)
1597{
1598        int retval;
1599        struct inode *inode;
1600        struct cpu_key key;
1601        INITIALIZE_PATH(path);
1602        struct reiserfs_dir_entry de;
1603        __u32 hash = DEFAULT_HASH;
1604
1605        inode = s->s_root->d_inode;
1606
1607        do {                    // Some serious "goto"-hater was there ;)
1608                u32 teahash, r5hash, yurahash;
1609
1610                make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
1611                retval = search_by_entry_key(s, &key, &path, &de);
1612                if (retval == IO_ERROR) {
1613                        pathrelse(&path);
1614                        return UNSET_HASH;
1615                }
1616                if (retval == NAME_NOT_FOUND)
1617                        de.de_entry_num--;
1618                set_de_name_and_namelen(&de);
1619                if (deh_offset(&(de.de_deh[de.de_entry_num])) == DOT_DOT_OFFSET) {
1620                        /* allow override in this case */
1621                        if (reiserfs_rupasov_hash(s)) {
1622                                hash = YURA_HASH;
1623                        }
1624                        reiserfs_info(s, "FS seems to be empty, autodetect "
1625                                         "is using the default hash\n");
1626                        break;
1627                }
1628                r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
1629                teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
1630                yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
1631                if (((teahash == r5hash)
1632                     &&
1633                     (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num])))
1634                      == r5hash)) || ((teahash == yurahash)
1635                                      && (yurahash ==
1636                                          GET_HASH_VALUE(deh_offset
1637                                                         (&
1638                                                          (de.
1639                                                           de_deh[de.
1640                                                                  de_entry_num])))))
1641                    || ((r5hash == yurahash)
1642                        && (yurahash ==
1643                            GET_HASH_VALUE(deh_offset
1644                                           (&(de.de_deh[de.de_entry_num])))))) {
1645                        reiserfs_warning(s, "reiserfs-2506", "Unable to "
1646                                         "automatically detect hash function. "
1647                                         "Please mount with -o "
1648                                         "hash={tea,rupasov,r5}");
1649                        hash = UNSET_HASH;
1650                        break;
1651                }
1652                if (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num]))) ==
1653                    yurahash)
1654                        hash = YURA_HASH;
1655                else if (GET_HASH_VALUE
1656                         (deh_offset(&(de.de_deh[de.de_entry_num]))) == teahash)
1657                        hash = TEA_HASH;
1658                else if (GET_HASH_VALUE
1659                         (deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash)
1660                        hash = R5_HASH;
1661                else {
1662                        reiserfs_warning(s, "reiserfs-2506",
1663                                         "Unrecognised hash function");
1664                        hash = UNSET_HASH;
1665                }
1666        } while (0);
1667
1668        pathrelse(&path);
1669        return hash;
1670}
1671
1672// finds out which hash names are sorted with
1673static int what_hash(struct super_block *s)
1674{
1675        __u32 code;
1676
1677        code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
1678
1679        /* reiserfs_hash_detect() == true if any of the hash mount options
1680         ** were used.  We must check them to make sure the user isn't
1681         ** using a bad hash value
1682         */
1683        if (code == UNSET_HASH || reiserfs_hash_detect(s))
1684                code = find_hash_out(s);
1685
1686        if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
1687                /* detection has found the hash, and we must check against the
1688                 ** mount options
1689                 */
1690                if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
1691                        reiserfs_warning(s, "reiserfs-2507",
1692                                         "Error, %s hash detected, "
1693                                         "unable to force rupasov hash",
1694                                         reiserfs_hashname(code));
1695                        code = UNSET_HASH;
1696                } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
1697                        reiserfs_warning(s, "reiserfs-2508",
1698                                         "Error, %s hash detected, "
1699                                         "unable to force tea hash",
1700                                         reiserfs_hashname(code));
1701                        code = UNSET_HASH;
1702                } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
1703                        reiserfs_warning(s, "reiserfs-2509",
1704                                         "Error, %s hash detected, "
1705                                         "unable to force r5 hash",
1706                                         reiserfs_hashname(code));
1707                        code = UNSET_HASH;
1708                }
1709        } else {
1710                /* find_hash_out was not called or could not determine the hash */
1711                if (reiserfs_rupasov_hash(s)) {
1712                        code = YURA_HASH;
1713                } else if (reiserfs_tea_hash(s)) {
1714                        code = TEA_HASH;
1715                } else if (reiserfs_r5_hash(s)) {
1716                        code = R5_HASH;
1717                }
1718        }
1719
1720        /* if we are mounted RW, and we have a new valid hash code, update
1721         ** the super
1722         */
1723        if (code != UNSET_HASH &&
1724            !(s->s_flags & MS_RDONLY) &&
1725            code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
1726                set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
1727        }
1728        return code;
1729}
1730
1731// return pointer to appropriate function
1732static hashf_t hash_function(struct super_block *s)
1733{
1734        switch (what_hash(s)) {
1735        case TEA_HASH:
1736                reiserfs_info(s, "Using tea hash to sort names\n");
1737                return keyed_hash;
1738        case YURA_HASH:
1739                reiserfs_info(s, "Using rupasov hash to sort names\n");
1740                return yura_hash;
1741        case R5_HASH:
1742                reiserfs_info(s, "Using r5 hash to sort names\n");
1743                return r5_hash;
1744        }
1745        return NULL;
1746}
1747
1748// this is used to set up correct value for old partitions
1749static int function2code(hashf_t func)
1750{
1751        if (func == keyed_hash)
1752                return TEA_HASH;
1753        if (func == yura_hash)
1754                return YURA_HASH;
1755        if (func == r5_hash)
1756                return R5_HASH;
1757
1758        BUG();                  // should never happen
1759
1760        return 0;
1761}
1762
1763#define SWARN(silent, s, id, ...)                       \
1764        if (!(silent))                          \
1765                reiserfs_warning(s, id, __VA_ARGS__)
1766
1767static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
1768{
1769        struct inode *root_inode;
1770        struct reiserfs_transaction_handle th;
1771        int old_format = 0;
1772        unsigned long blocks;
1773        unsigned int commit_max_age = 0;
1774        int jinit_done = 0;
1775        struct reiserfs_iget_args args;
1776        struct reiserfs_super_block *rs;
1777        char *jdev_name;
1778        struct reiserfs_sb_info *sbi;
1779        int errval = -EINVAL;
1780        char *qf_names[MAXQUOTAS] = {};
1781        unsigned int qfmt = 0;
1782
1783        save_mount_options(s, data);
1784
1785        sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
1786        if (!sbi)
1787                return -ENOMEM;
1788        s->s_fs_info = sbi;
1789        /* Set default values for options: non-aggressive tails, RO on errors */
1790        sbi->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
1791        sbi->s_mount_opt |= (1 << REISERFS_ERROR_RO);
1792        sbi->s_mount_opt |= (1 << REISERFS_BARRIER_FLUSH);
1793        /* no preallocation minimum, be smart in
1794           reiserfs_file_write instead */
1795        sbi->s_alloc_options.preallocmin = 0;
1796        /* Preallocate by 16 blocks (17-1) at once */
1797        sbi->s_alloc_options.preallocsize = 17;
1798        /* setup default block allocator options */
1799        reiserfs_init_alloc_options(s);
1800
1801        spin_lock_init(&sbi->old_work_lock);
1802        INIT_DELAYED_WORK(&sbi->old_work, flush_old_commits);
1803        mutex_init(&sbi->lock);
1804        sbi->lock_depth = -1;
1805
1806        jdev_name = NULL;
1807        if (reiserfs_parse_options
1808            (s, (char *)data, &(sbi->s_mount_opt), &blocks, &jdev_name,
1809             &commit_max_age, qf_names, &qfmt) == 0) {
1810                goto error_unlocked;
1811        }
1812        if (jdev_name && jdev_name[0]) {
1813                sbi->s_jdev = kstrdup(jdev_name, GFP_KERNEL);
1814                if (!sbi->s_jdev) {
1815                        SWARN(silent, s, "", "Cannot allocate memory for "
1816                                "journal device name");
1817                        goto error;
1818                }
1819        }
1820#ifdef CONFIG_QUOTA
1821        handle_quota_files(s, qf_names, &qfmt);
1822#endif
1823
1824        if (blocks) {
1825                SWARN(silent, s, "jmacd-7", "resize option for remount only");
1826                goto error_unlocked;
1827        }
1828
1829        /* try old format (undistributed bitmap, super block in 8-th 1k block of a device) */
1830        if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
1831                old_format = 1;
1832        /* try new format (64-th 1k block), which can contain reiserfs super block */
1833        else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
1834                SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
1835                      reiserfs_bdevname(s));
1836                goto error_unlocked;
1837        }
1838
1839        rs = SB_DISK_SUPER_BLOCK(s);
1840        /* Let's do basic sanity check to verify that underlying device is not
1841           smaller than the filesystem. If the check fails then abort and scream,
1842           because bad stuff will happen otherwise. */
1843        if (s->s_bdev && s->s_bdev->bd_inode
1844            && i_size_read(s->s_bdev->bd_inode) <
1845            sb_block_count(rs) * sb_blocksize(rs)) {
1846                SWARN(silent, s, "", "Filesystem cannot be "
1847                      "mounted because it is bigger than the device");
1848                SWARN(silent, s, "", "You may need to run fsck "
1849                      "or increase size of your LVM partition");
1850                SWARN(silent, s, "", "Or may be you forgot to "
1851                      "reboot after fdisk when it told you to");
1852                goto error_unlocked;
1853        }
1854
1855        sbi->s_mount_state = SB_REISERFS_STATE(s);
1856        sbi->s_mount_state = REISERFS_VALID_FS;
1857
1858        if ((errval = reiserfs_init_bitmap_cache(s))) {
1859                SWARN(silent, s, "jmacd-8", "unable to read bitmap");
1860                goto error_unlocked;
1861        }
1862
1863        errval = -EINVAL;
1864#ifdef CONFIG_REISERFS_CHECK
1865        SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
1866        SWARN(silent, s, "", "- it is slow mode for debugging.");
1867#endif
1868
1869        /* make data=ordered the default */
1870        if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
1871            !reiserfs_data_writeback(s)) {
1872                sbi->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
1873        }
1874
1875        if (reiserfs_data_log(s)) {
1876                reiserfs_info(s, "using journaled data mode\n");
1877        } else if (reiserfs_data_ordered(s)) {
1878                reiserfs_info(s, "using ordered data mode\n");
1879        } else {
1880                reiserfs_info(s, "using writeback data mode\n");
1881        }
1882        if (reiserfs_barrier_flush(s)) {
1883                printk("reiserfs: using flush barriers\n");
1884        }
1885
1886        // set_device_ro(s->s_dev, 1) ;
1887        if (journal_init(s, jdev_name, old_format, commit_max_age)) {
1888                SWARN(silent, s, "sh-2022",
1889                      "unable to initialize journal space");
1890                goto error_unlocked;
1891        } else {
1892                jinit_done = 1; /* once this is set, journal_release must be called
1893                                 ** if we error out of the mount
1894                                 */
1895        }
1896
1897        if (reread_meta_blocks(s)) {
1898                SWARN(silent, s, "jmacd-9",
1899                      "unable to reread meta blocks after journal init");
1900                goto error_unlocked;
1901        }
1902
1903        if (replay_only(s))
1904                goto error_unlocked;
1905
1906        if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
1907                SWARN(silent, s, "clm-7000",
1908                      "Detected readonly device, marking FS readonly");
1909                s->s_flags |= MS_RDONLY;
1910        }
1911        args.objectid = REISERFS_ROOT_OBJECTID;
1912        args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
1913        root_inode =
1914            iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
1915                         reiserfs_init_locked_inode, (void *)(&args));
1916        if (!root_inode) {
1917                SWARN(silent, s, "jmacd-10", "get root inode failed");
1918                goto error_unlocked;
1919        }
1920
1921        /*
1922         * This path assumed to be called with the BKL in the old times.
1923         * Now we have inherited the big reiserfs lock from it and many
1924         * reiserfs helpers called in the mount path and elsewhere require
1925         * this lock to be held even if it's not always necessary. Let's be
1926         * conservative and hold it early. The window can be reduced after
1927         * careful review of the code.
1928         */
1929        reiserfs_write_lock(s);
1930
1931        if (root_inode->i_state & I_NEW) {
1932                reiserfs_read_locked_inode(root_inode, &args);
1933                unlock_new_inode(root_inode);
1934        }
1935
1936        s->s_root = d_make_root(root_inode);
1937        if (!s->s_root)
1938                goto error;
1939        // define and initialize hash function
1940        sbi->s_hash_function = hash_function(s);
1941        if (sbi->s_hash_function == NULL) {
1942                dput(s->s_root);
1943                s->s_root = NULL;
1944                goto error;
1945        }
1946
1947        if (is_reiserfs_3_5(rs)
1948            || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
1949                set_bit(REISERFS_3_5, &(sbi->s_properties));
1950        else if (old_format)
1951                set_bit(REISERFS_OLD_FORMAT, &(sbi->s_properties));
1952        else
1953                set_bit(REISERFS_3_6, &(sbi->s_properties));
1954
1955        if (!(s->s_flags & MS_RDONLY)) {
1956
1957                errval = journal_begin(&th, s, 1);
1958                if (errval) {
1959                        dput(s->s_root);
1960                        s->s_root = NULL;
1961                        goto error;
1962                }
1963                reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
1964
1965                set_sb_umount_state(rs, REISERFS_ERROR_FS);
1966                set_sb_fs_state(rs, 0);
1967
1968                /* Clear out s_bmap_nr if it would wrap. We can handle this
1969                 * case, but older revisions can't. This will cause the
1970                 * file system to fail mount on those older implementations,
1971                 * avoiding corruption. -jeffm */
1972                if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
1973                    sb_bmap_nr(rs) != 0) {
1974                        reiserfs_warning(s, "super-2030", "This file system "
1975                                        "claims to use %u bitmap blocks in "
1976                                        "its super block, but requires %u. "
1977                                        "Clearing to zero.", sb_bmap_nr(rs),
1978                                        reiserfs_bmap_count(s));
1979
1980                        set_sb_bmap_nr(rs, 0);
1981                }
1982
1983                if (old_format_only(s)) {
1984                        /* filesystem of format 3.5 either with standard or non-standard
1985                           journal */
1986                        if (convert_reiserfs(s)) {
1987                                /* and -o conv is given */
1988                                if (!silent)
1989                                        reiserfs_info(s,
1990                                                      "converting 3.5 filesystem to the 3.6 format");
1991
1992                                if (is_reiserfs_3_5(rs))
1993                                        /* put magic string of 3.6 format. 2.2 will not be able to
1994                                           mount this filesystem anymore */
1995                                        memcpy(rs->s_v1.s_magic,
1996                                               reiserfs_3_6_magic_string,
1997                                               sizeof
1998                                               (reiserfs_3_6_magic_string));
1999
2000                                set_sb_version(rs, REISERFS_VERSION_2);
2001                                reiserfs_convert_objectid_map_v1(s);
2002                                set_bit(REISERFS_3_6, &(sbi->s_properties));
2003                                clear_bit(REISERFS_3_5, &(sbi->s_properties));
2004                        } else if (!silent) {
2005                                reiserfs_info(s, "using 3.5.x disk format\n");
2006                        }
2007                } else
2008                        set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
2009
2010
2011                journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
2012                errval = journal_end(&th, s, 1);
2013                if (errval) {
2014                        dput(s->s_root);
2015                        s->s_root = NULL;
2016                        goto error;
2017                }
2018
2019                if ((errval = reiserfs_lookup_privroot(s)) ||
2020                    (errval = reiserfs_xattr_init(s, s->s_flags))) {
2021                        dput(s->s_root);
2022                        s->s_root = NULL;
2023                        goto error;
2024                }
2025
2026                /* look for files which were to be removed in previous session */
2027                finish_unfinished(s);
2028        } else {
2029                if (old_format_only(s) && !silent) {
2030                        reiserfs_info(s, "using 3.5.x disk format\n");
2031                }
2032
2033                if ((errval = reiserfs_lookup_privroot(s)) ||
2034                    (errval = reiserfs_xattr_init(s, s->s_flags))) {
2035                        dput(s->s_root);
2036                        s->s_root = NULL;
2037                        goto error;
2038                }
2039        }
2040        // mark hash in super block: it could be unset. overwrite should be ok
2041        set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
2042
2043        handle_attrs(s);
2044
2045        reiserfs_proc_info_init(s);
2046
2047        init_waitqueue_head(&(sbi->s_wait));
2048        spin_lock_init(&sbi->bitmap_lock);
2049
2050        reiserfs_write_unlock(s);
2051
2052        return (0);
2053
2054error:
2055        reiserfs_write_unlock(s);
2056
2057error_unlocked:
2058        /* kill the commit thread, free journal ram */
2059        if (jinit_done) {
2060                reiserfs_write_lock(s);
2061                journal_release_error(NULL, s);
2062                reiserfs_write_unlock(s);
2063        }
2064
2065        cancel_delayed_work_sync(&REISERFS_SB(s)->old_work);
2066
2067        reiserfs_free_bitmap_cache(s);
2068        if (SB_BUFFER_WITH_SB(s))
2069                brelse(SB_BUFFER_WITH_SB(s));
2070#ifdef CONFIG_QUOTA
2071        {
2072                int j;
2073                for (j = 0; j < MAXQUOTAS; j++)
2074                        kfree(qf_names[j]);
2075        }
2076#endif
2077        kfree(sbi);
2078
2079        s->s_fs_info = NULL;
2080        return errval;
2081}
2082
2083static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
2084{
2085        struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
2086
2087        buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
2088        buf->f_bfree = sb_free_blocks(rs);
2089        buf->f_bavail = buf->f_bfree;
2090        buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
2091        buf->f_bsize = dentry->d_sb->s_blocksize;
2092        /* changed to accommodate gcc folks. */
2093        buf->f_type = REISERFS_SUPER_MAGIC;
2094        buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
2095        buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
2096                                sizeof(rs->s_uuid)/2);
2097
2098        return 0;
2099}
2100
2101#ifdef CONFIG_QUOTA
2102static int reiserfs_write_dquot(struct dquot *dquot)
2103{
2104        struct reiserfs_transaction_handle th;
2105        int ret, err;
2106
2107        reiserfs_write_lock(dquot->dq_sb);
2108        ret =
2109            journal_begin(&th, dquot->dq_sb,
2110                          REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2111        if (ret)
2112                goto out;
2113        reiserfs_write_unlock(dquot->dq_sb);
2114        ret = dquot_commit(dquot);
2115        reiserfs_write_lock(dquot->dq_sb);
2116        err =
2117            journal_end(&th, dquot->dq_sb,
2118                        REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2119        if (!ret && err)
2120                ret = err;
2121out:
2122        reiserfs_write_unlock(dquot->dq_sb);
2123        return ret;
2124}
2125
2126static int reiserfs_acquire_dquot(struct dquot *dquot)
2127{
2128        struct reiserfs_transaction_handle th;
2129        int ret, err;
2130
2131        reiserfs_write_lock(dquot->dq_sb);
2132        ret =
2133            journal_begin(&th, dquot->dq_sb,
2134                          REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2135        if (ret)
2136                goto out;
2137        reiserfs_write_unlock(dquot->dq_sb);
2138        ret = dquot_acquire(dquot);
2139        reiserfs_write_lock(dquot->dq_sb);
2140        err =
2141            journal_end(&th, dquot->dq_sb,
2142                        REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2143        if (!ret && err)
2144                ret = err;
2145out:
2146        reiserfs_write_unlock(dquot->dq_sb);
2147        return ret;
2148}
2149
2150static int reiserfs_release_dquot(struct dquot *dquot)
2151{
2152        struct reiserfs_transaction_handle th;
2153        int ret, err;
2154
2155        reiserfs_write_lock(dquot->dq_sb);
2156        ret =
2157            journal_begin(&th, dquot->dq_sb,
2158                          REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2159        reiserfs_write_unlock(dquot->dq_sb);
2160        if (ret) {
2161                /* Release dquot anyway to avoid endless cycle in dqput() */
2162                dquot_release(dquot);
2163                goto out;
2164        }
2165        ret = dquot_release(dquot);
2166        reiserfs_write_lock(dquot->dq_sb);
2167        err =
2168            journal_end(&th, dquot->dq_sb,
2169                        REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2170        if (!ret && err)
2171                ret = err;
2172        reiserfs_write_unlock(dquot->dq_sb);
2173out:
2174        return ret;
2175}
2176
2177static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
2178{
2179        /* Are we journaling quotas? */
2180        if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2181            REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2182                dquot_mark_dquot_dirty(dquot);
2183                return reiserfs_write_dquot(dquot);
2184        } else
2185                return dquot_mark_dquot_dirty(dquot);
2186}
2187
2188static int reiserfs_write_info(struct super_block *sb, int type)
2189{
2190        struct reiserfs_transaction_handle th;
2191        int ret, err;
2192
2193        /* Data block + inode block */
2194        reiserfs_write_lock(sb);
2195        ret = journal_begin(&th, sb, 2);
2196        if (ret)
2197                goto out;
2198        reiserfs_write_unlock(sb);
2199        ret = dquot_commit_info(sb, type);
2200        reiserfs_write_lock(sb);
2201        err = journal_end(&th, sb, 2);
2202        if (!ret && err)
2203                ret = err;
2204out:
2205        reiserfs_write_unlock(sb);
2206        return ret;
2207}
2208
2209/*
2210 * Turn on quotas during mount time - we need to find the quota file and such...
2211 */
2212static int reiserfs_quota_on_mount(struct super_block *sb, int type)
2213{
2214        return dquot_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
2215                                        REISERFS_SB(sb)->s_jquota_fmt, type);
2216}
2217
2218/*
2219 * Standard function to be called on quota_on
2220 */
2221static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
2222                             struct path *path)
2223{
2224        int err;
2225        struct inode *inode;
2226        struct reiserfs_transaction_handle th;
2227        int opt = type == USRQUOTA ? REISERFS_USRQUOTA : REISERFS_GRPQUOTA;
2228
2229        reiserfs_write_lock(sb);
2230        if (!(REISERFS_SB(sb)->s_mount_opt & (1 << opt))) {
2231                err = -EINVAL;
2232                goto out;
2233        }
2234
2235        /* Quotafile not on the same filesystem? */
2236        if (path->dentry->d_sb != sb) {
2237                err = -EXDEV;
2238                goto out;
2239        }
2240        inode = path->dentry->d_inode;
2241        /* We must not pack tails for quota files on reiserfs for quota IO to work */
2242        if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
2243                err = reiserfs_unpack(inode, NULL);
2244                if (err) {
2245                        reiserfs_warning(sb, "super-6520",
2246                                "Unpacking tail of quota file failed"
2247                                " (%d). Cannot turn on quotas.", err);
2248                        err = -EINVAL;
2249                        goto out;
2250                }
2251                mark_inode_dirty(inode);
2252        }
2253        /* Journaling quota? */
2254        if (REISERFS_SB(sb)->s_qf_names[type]) {
2255                /* Quotafile not of fs root? */
2256                if (path->dentry->d_parent != sb->s_root)
2257                        reiserfs_warning(sb, "super-6521",
2258                                 "Quota file not on filesystem root. "
2259                                 "Journalled quota will not work.");
2260        }
2261
2262        /*
2263         * When we journal data on quota file, we have to flush journal to see
2264         * all updates to the file when we bypass pagecache...
2265         */
2266        if (reiserfs_file_data_log(inode)) {
2267                /* Just start temporary transaction and finish it */
2268                err = journal_begin(&th, sb, 1);
2269                if (err)
2270                        goto out;
2271                err = journal_end_sync(&th, sb, 1);
2272                if (err)
2273                        goto out;
2274        }
2275        reiserfs_write_unlock(sb);
2276        return dquot_quota_on(sb, type, format_id, path);
2277out:
2278        reiserfs_write_unlock(sb);
2279        return err;
2280}
2281
2282/* Read data from quotafile - avoid pagecache and such because we cannot afford
2283 * acquiring the locks... As quota files are never truncated and quota code
2284 * itself serializes the operations (and no one else should touch the files)
2285 * we don't have to be afraid of races */
2286static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
2287                                   size_t len, loff_t off)
2288{
2289        struct inode *inode = sb_dqopt(sb)->files[type];
2290        unsigned long blk = off >> sb->s_blocksize_bits;
2291        int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2292        size_t toread;
2293        struct buffer_head tmp_bh, *bh;
2294        loff_t i_size = i_size_read(inode);
2295
2296        if (off > i_size)
2297                return 0;
2298        if (off + len > i_size)
2299                len = i_size - off;
2300        toread = len;
2301        while (toread > 0) {
2302                tocopy =
2303                    sb->s_blocksize - offset <
2304                    toread ? sb->s_blocksize - offset : toread;
2305                tmp_bh.b_state = 0;
2306                /* Quota files are without tails so we can safely use this function */
2307                reiserfs_write_lock(sb);
2308                err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
2309                reiserfs_write_unlock(sb);
2310                if (err)
2311                        return err;
2312                if (!buffer_mapped(&tmp_bh))    /* A hole? */
2313                        memset(data, 0, tocopy);
2314                else {
2315                        bh = sb_bread(sb, tmp_bh.b_blocknr);
2316                        if (!bh)
2317                                return -EIO;
2318                        memcpy(data, bh->b_data + offset, tocopy);
2319                        brelse(bh);
2320                }
2321                offset = 0;
2322                toread -= tocopy;
2323                data += tocopy;
2324                blk++;
2325        }
2326        return len;
2327}
2328
2329/* Write to quotafile (we know the transaction is already started and has
2330 * enough credits) */
2331static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
2332                                    const char *data, size_t len, loff_t off)
2333{
2334        struct inode *inode = sb_dqopt(sb)->files[type];
2335        unsigned long blk = off >> sb->s_blocksize_bits;
2336        int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
2337        int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
2338        size_t towrite = len;
2339        struct buffer_head tmp_bh, *bh;
2340
2341        if (!current->journal_info) {
2342                printk(KERN_WARNING "reiserfs: Quota write (off=%Lu, len=%Lu)"
2343                        " cancelled because transaction is not started.\n",
2344                        (unsigned long long)off, (unsigned long long)len);
2345                return -EIO;
2346        }
2347        while (towrite > 0) {
2348                tocopy = sb->s_blocksize - offset < towrite ?
2349                    sb->s_blocksize - offset : towrite;
2350                tmp_bh.b_state = 0;
2351                reiserfs_write_lock(sb);
2352                err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
2353                reiserfs_write_unlock(sb);
2354                if (err)
2355                        goto out;
2356                if (offset || tocopy != sb->s_blocksize)
2357                        bh = sb_bread(sb, tmp_bh.b_blocknr);
2358                else
2359                        bh = sb_getblk(sb, tmp_bh.b_blocknr);
2360                if (!bh) {
2361                        err = -EIO;
2362                        goto out;
2363                }
2364                lock_buffer(bh);
2365                memcpy(bh->b_data + offset, data, tocopy);
2366                flush_dcache_page(bh->b_page);
2367                set_buffer_uptodate(bh);
2368                unlock_buffer(bh);
2369                reiserfs_write_lock(sb);
2370                reiserfs_prepare_for_journal(sb, bh, 1);
2371                journal_mark_dirty(current->journal_info, sb, bh);
2372                if (!journal_quota)
2373                        reiserfs_add_ordered_list(inode, bh);
2374                reiserfs_write_unlock(sb);
2375                brelse(bh);
2376                offset = 0;
2377                towrite -= tocopy;
2378                data += tocopy;
2379                blk++;
2380        }
2381out:
2382        if (len == towrite)
2383                return err;
2384        if (inode->i_size < off + len - towrite)
2385                i_size_write(inode, off + len - towrite);
2386        inode->i_version++;
2387        inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2388        mark_inode_dirty(inode);
2389        return len - towrite;
2390}
2391
2392#endif
2393
2394static struct dentry *get_super_block(struct file_system_type *fs_type,
2395                           int flags, const char *dev_name,
2396                           void *data)
2397{
2398        return mount_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super);
2399}
2400
2401static int __init init_reiserfs_fs(void)
2402{
2403        int ret;
2404
2405        if ((ret = init_inodecache())) {
2406                return ret;
2407        }
2408
2409        reiserfs_proc_info_global_init();
2410
2411        ret = register_filesystem(&reiserfs_fs_type);
2412
2413        if (ret == 0) {
2414                return 0;
2415        }
2416
2417        reiserfs_proc_info_global_done();
2418        destroy_inodecache();
2419
2420        return ret;
2421}
2422
2423static void __exit exit_reiserfs_fs(void)
2424{
2425        reiserfs_proc_info_global_done();
2426        unregister_filesystem(&reiserfs_fs_type);
2427        destroy_inodecache();
2428}
2429
2430struct file_system_type reiserfs_fs_type = {
2431        .owner = THIS_MODULE,
2432        .name = "reiserfs",
2433        .mount = get_super_block,
2434        .kill_sb = reiserfs_kill_sb,
2435        .fs_flags = FS_REQUIRES_DEV,
2436};
2437
2438MODULE_DESCRIPTION("ReiserFS journaled filesystem");
2439MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
2440MODULE_LICENSE("GPL");
2441
2442module_init(init_reiserfs_fs);
2443module_exit(exit_reiserfs_fs);
2444
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