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	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 /*
  * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
  *
  * Trivial changes by Alan Cox to add the LFS fixes
  *
  * Trivial Changes:
  * Rights granted to Hans Reiser to redistribute under other terms providing
  * he accepts all liability including but not limited to patent, fitness
  * for purpose, and direct or indirect claims arising from failure to perform.
  *
  * NO WARRANTY
  */
 
 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/vmalloc.h>
 #include <linux/time.h>
 #include <linux/uaccess.h>
 #include "reiserfs.h"
 #include "acl.h"
 #include "xattr.h"
 #include <linux/init.h>
 #include <linux/blkdev.h>
 #include <linux/backing-dev.h>
 #include <linux/buffer_head.h>
 #include <linux/exportfs.h>
 #include <linux/quotaops.h>
 #include <linux/vfs.h>
 #include <linux/mount.h>
 #include <linux/namei.h>
 #include <linux/crc32.h>
 #include <linux/seq_file.h>
 
 struct file_system_type reiserfs_fs_type;
 
 static const char reiserfs_3_5_magic_string[] = REISERFS_SUPER_MAGIC_STRING;
 static const char reiserfs_3_6_magic_string[] = REISER2FS_SUPER_MAGIC_STRING;
 static const char reiserfs_jr_magic_string[] = REISER2FS_JR_SUPER_MAGIC_STRING;
 
 int is_reiserfs_3_5(struct reiserfs_super_block *rs)
 {
     return !strncmp(rs->s_v1.s_magic, reiserfs_3_5_magic_string,
             strlen(reiserfs_3_5_magic_string));
 }
 
 int is_reiserfs_3_6(struct reiserfs_super_block *rs)
 {
     return !strncmp(rs->s_v1.s_magic, reiserfs_3_6_magic_string,
             strlen(reiserfs_3_6_magic_string));
 }
 
 int is_reiserfs_jr(struct reiserfs_super_block *rs)
 {
     return !strncmp(rs->s_v1.s_magic, reiserfs_jr_magic_string,
             strlen(reiserfs_jr_magic_string));
 }
 
 static int is_any_reiserfs_magic_string(struct reiserfs_super_block *rs)
 {
     return (is_reiserfs_3_5(rs) || is_reiserfs_3_6(rs) ||
         is_reiserfs_jr(rs));
 }
 
 static int reiserfs_remount(struct super_block *s, int *flags, char *data);
 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf);
 
 static int reiserfs_sync_fs(struct super_block *s, int wait)
 {
     struct reiserfs_transaction_handle th;
 
     /*
      * Writeback quota in non-journalled quota case - journalled quota has
      * no dirty dquots
      */
     dquot_writeback_dquots(s, -1);
     reiserfs_write_lock(s);
     if (!journal_begin(&th, s, 1))
         if (!journal_end_sync(&th))
             reiserfs_flush_old_commits(s);
     reiserfs_write_unlock(s);
     return 0;
 }
 
 static void flush_old_commits(struct work_struct *work)
 {
     struct reiserfs_sb_info *sbi;
     struct super_block *s;
 
     sbi = container_of(work, struct reiserfs_sb_info, old_work.work);
     s = sbi->s_journal->j_work_sb;
 
     /*
      * We need s_umount for protecting quota writeback. We have to use
      * trylock as reiserfs_cancel_old_flush() may be waiting for this work
      * to complete with s_umount held.
      */
     if (!down_read_trylock(&s->s_umount)) {
         /* Requeue work if we are not cancelling it */
         spin_lock(&sbi->old_work_lock);
         if (sbi->work_queued == 1)
             queue_delayed_work(system_long_wq, &sbi->old_work, HZ);
         spin_unlock(&sbi->old_work_lock);
         return;
     }
     spin_lock(&sbi->old_work_lock);
     /* Avoid clobbering the cancel state... */
     if (sbi->work_queued == 1)
         sbi->work_queued = 0;
     spin_unlock(&sbi->old_work_lock);
 
     reiserfs_sync_fs(s, 1);
     up_read(&s->s_umount);
 }
 
 void reiserfs_schedule_old_flush(struct super_block *s)
 {
     struct reiserfs_sb_info *sbi = REISERFS_SB(s);
     unsigned long delay;
 
     /*
      * Avoid scheduling flush when sb is being shut down. It can race
      * with journal shutdown and free still queued delayed work.
      */
     if (sb_rdonly(s) || !(s->s_flags & SB_ACTIVE))
         return;
 
     spin_lock(&sbi->old_work_lock);
     if (!sbi->work_queued) {
         delay = msecs_to_jiffies(dirty_writeback_interval * 10);
         queue_delayed_work(system_long_wq, &sbi->old_work, delay);
         sbi->work_queued = 1;
     }
     spin_unlock(&sbi->old_work_lock);
 }
 
 void reiserfs_cancel_old_flush(struct super_block *s)
 {
     struct reiserfs_sb_info *sbi = REISERFS_SB(s);
 
     spin_lock(&sbi->old_work_lock);
     /* Make sure no new flushes will be queued */
     sbi->work_queued = 2;
     spin_unlock(&sbi->old_work_lock);
     cancel_delayed_work_sync(&REISERFS_SB(s)->old_work);
 }
 
 static int reiserfs_freeze(struct super_block *s)
 {
     struct reiserfs_transaction_handle th;
 
     reiserfs_cancel_old_flush(s);
 
     reiserfs_write_lock(s);
     if (!sb_rdonly(s)) {
         int err = journal_begin(&th, s, 1);
         if (err) {
             reiserfs_block_writes(&th);
         } else {
             reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
                              1);
             journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
             reiserfs_block_writes(&th);
             journal_end_sync(&th);
         }
     }
     reiserfs_write_unlock(s);
     return 0;
 }
 
 static int reiserfs_unfreeze(struct super_block *s)
 {
     struct reiserfs_sb_info *sbi = REISERFS_SB(s);
 
     reiserfs_allow_writes(s);
     spin_lock(&sbi->old_work_lock);
     /* Allow old_work to run again */
     sbi->work_queued = 0;
     spin_unlock(&sbi->old_work_lock);
     return 0;
 }
 
 extern const struct in_core_key MAX_IN_CORE_KEY;
 
 /*
  * this is used to delete "save link" when there are no items of a
  * file it points to. It can either happen if unlink is completed but
  * "save unlink" removal, or if file has both unlink and truncate
  * pending and as unlink completes first (because key of "save link"
  * protecting unlink is bigger that a key lf "save link" which
  * protects truncate), so there left no items to make truncate
  * completion on
  */
 static int remove_save_link_only(struct super_block *s,
                  struct reiserfs_key *key, int oid_free)
 {
     struct reiserfs_transaction_handle th;
     int err;
 
     /* we are going to do one balancing */
     err = journal_begin(&th, s, JOURNAL_PER_BALANCE_CNT);
     if (err)
         return err;
 
     reiserfs_delete_solid_item(&th, NULL, key);
     if (oid_free)
         /* removals are protected by direct items */
         reiserfs_release_objectid(&th, le32_to_cpu(key->k_objectid));
 
     return journal_end(&th);
 }
 
 #ifdef CONFIG_QUOTA
 static int reiserfs_quota_on_mount(struct super_block *, int);
 #endif
 
 /*
  * Look for uncompleted unlinks and truncates and complete them
  *
  * Called with superblock write locked.  If quotas are enabled, we have to
  * release/retake lest we call dquot_quota_on_mount(), proceed to
  * schedule_on_each_cpu() in invalidate_bdev() and deadlock waiting for the per
  * cpu worklets to complete flush_async_commits() that in turn wait for the
  * superblock write lock.
  */
 static int finish_unfinished(struct super_block *s)
 {
     INITIALIZE_PATH(path);
     struct cpu_key max_cpu_key, obj_key;
     struct reiserfs_key save_link_key, last_inode_key;
     int retval = 0;
     struct item_head *ih;
     struct buffer_head *bh;
     int item_pos;
     char *item;
     int done;
     struct inode *inode;
     int truncate;
 #ifdef CONFIG_QUOTA
     int i;
     int ms_active_set;
     int quota_enabled[REISERFS_MAXQUOTAS];
 #endif
 
     /* compose key to look for "save" links */
     max_cpu_key.version = KEY_FORMAT_3_5;
     max_cpu_key.on_disk_key.k_dir_id = ~0U;
     max_cpu_key.on_disk_key.k_objectid = ~0U;
     set_cpu_key_k_offset(&max_cpu_key, ~0U);
     max_cpu_key.key_length = 3;
 
     memset(&last_inode_key, 0, sizeof(last_inode_key));
 
 #ifdef CONFIG_QUOTA
     /* Needed for iput() to work correctly and not trash data */
     if (s->s_flags & SB_ACTIVE) {
         ms_active_set = 0;
     } else {
         ms_active_set = 1;
         s->s_flags |= SB_ACTIVE;
     }
     /* Turn on quotas so that they are updated correctly */
     for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
         quota_enabled[i] = 1;
         if (REISERFS_SB(s)->s_qf_names[i]) {
             int ret;
 
             if (sb_has_quota_active(s, i)) {
                 quota_enabled[i] = 0;
                 continue;
             }
             reiserfs_write_unlock(s);
             ret = reiserfs_quota_on_mount(s, i);
             reiserfs_write_lock(s);
             if (ret < 0)
                 reiserfs_warning(s, "reiserfs-2500",
                          "cannot turn on journaled "
                          "quota: error %d", ret);
         }
     }
 #endif
 
     done = 0;
     REISERFS_SB(s)->s_is_unlinked_ok = 1;
     while (!retval) {
         int depth;
         retval = search_item(s, &max_cpu_key, &path);
         if (retval != ITEM_NOT_FOUND) {
             reiserfs_error(s, "vs-2140",
                        "search_by_key returned %d", retval);
             break;
         }
 
         bh = get_last_bh(&path);
         item_pos = get_item_pos(&path);
         if (item_pos != B_NR_ITEMS(bh)) {
             reiserfs_warning(s, "vs-2060",
                      "wrong position found");
             break;
         }
         item_pos--;
         ih = item_head(bh, item_pos);
 
         if (le32_to_cpu(ih->ih_key.k_dir_id) != MAX_KEY_OBJECTID)
             /* there are no "save" links anymore */
             break;
 
         save_link_key = ih->ih_key;
         if (is_indirect_le_ih(ih))
             truncate = 1;
         else
             truncate = 0;
 
         /* reiserfs_iget needs k_dirid and k_objectid only */
         item = ih_item_body(bh, ih);
         obj_key.on_disk_key.k_dir_id = le32_to_cpu(*(__le32 *) item);
         obj_key.on_disk_key.k_objectid =
             le32_to_cpu(ih->ih_key.k_objectid);
         obj_key.on_disk_key.k_offset = 0;
         obj_key.on_disk_key.k_type = 0;
 
         pathrelse(&path);
 
         inode = reiserfs_iget(s, &obj_key);
         if (IS_ERR_OR_NULL(inode)) {
             /*
              * the unlink almost completed, it just did not
              * manage to remove "save" link and release objectid
              */
             reiserfs_warning(s, "vs-2180", "iget failed for %K",
                      &obj_key);
             retval = remove_save_link_only(s, &save_link_key, 1);
             continue;
         }
 
         if (!truncate && inode->i_nlink) {
             /* file is not unlinked */
             reiserfs_warning(s, "vs-2185",
                      "file %K is not unlinked",
                      &obj_key);
             retval = remove_save_link_only(s, &save_link_key, 0);
             continue;
         }
         depth = reiserfs_write_unlock_nested(inode->i_sb);
         dquot_initialize(inode);
         reiserfs_write_lock_nested(inode->i_sb, depth);
 
         if (truncate && S_ISDIR(inode->i_mode)) {
             /*
              * We got a truncate request for a dir which
              * is impossible.  The only imaginable way is to
              * execute unfinished truncate request then boot
              * into old kernel, remove the file and create dir
              * with the same key.
              */
             reiserfs_warning(s, "green-2101",
                      "impossible truncate on a "
                      "directory %k. Please report",
                      INODE_PKEY(inode));
             retval = remove_save_link_only(s, &save_link_key, 0);
             truncate = 0;
             iput(inode);
             continue;
         }
 
         if (truncate) {
             REISERFS_I(inode)->i_flags |=
                 i_link_saved_truncate_mask;
             /*
              * not completed truncate found. New size was
              * committed together with "save" link
              */
             reiserfs_info(s, "Truncating %k to %lld ..",
                       INODE_PKEY(inode), inode->i_size);
 
             /* don't update modification time */
             reiserfs_truncate_file(inode, 0);
 
             retval = remove_save_link(inode, truncate);
         } else {
             REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
             /* not completed unlink (rmdir) found */
             reiserfs_info(s, "Removing %k..", INODE_PKEY(inode));
             if (memcmp(&last_inode_key, INODE_PKEY(inode),
                     sizeof(last_inode_key))){
                 last_inode_key = *INODE_PKEY(inode);
                 /* removal gets completed in iput */
                 retval = 0;
             } else {
                 reiserfs_warning(s, "super-2189", "Dead loop "
                          "in finish_unfinished "
                          "detected, just remove "
                          "save link\n");
                 retval = remove_save_link_only(s,
                             &save_link_key, 0);
             }
         }
 
         iput(inode);
         printk("done\n");
         done++;
     }
     REISERFS_SB(s)->s_is_unlinked_ok = 0;
 
 #ifdef CONFIG_QUOTA
     /* Turn quotas off */
     reiserfs_write_unlock(s);
     for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
         if (sb_dqopt(s)->files[i] && quota_enabled[i])
             dquot_quota_off(s, i);
     }
     reiserfs_write_lock(s);
     if (ms_active_set)
         /* Restore the flag back */
         s->s_flags &= ~SB_ACTIVE;
 #endif
     pathrelse(&path);
     if (done)
         reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
                   "Completed\n", done);
     return retval;
 }
 
 /*
  * to protect file being unlinked from getting lost we "safe" link files
  * being unlinked. This link will be deleted in the same transaction with last
  * item of file. mounting the filesystem we scan all these links and remove
  * files which almost got lost
  */
 void add_save_link(struct reiserfs_transaction_handle *th,
            struct inode *inode, int truncate)
 {
     INITIALIZE_PATH(path);
     int retval;
     struct cpu_key key;
     struct item_head ih;
     __le32 link;
 
     BUG_ON(!th->t_trans_id);
 
     /* file can only get one "save link" of each kind */
     RFALSE(truncate &&
            (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
            "saved link already exists for truncated inode %lx",
            (long)inode->i_ino);
     RFALSE(!truncate &&
            (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
            "saved link already exists for unlinked inode %lx",
            (long)inode->i_ino);
 
     /* setup key of "save" link */
     key.version = KEY_FORMAT_3_5;
     key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
     key.on_disk_key.k_objectid = inode->i_ino;
     if (!truncate) {
         /* unlink, rmdir, rename */
         set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
         set_cpu_key_k_type(&key, TYPE_DIRECT);
 
         /* item head of "safe" link */
         make_le_item_head(&ih, &key, key.version,
                   1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
                   4 /*length */ , 0xffff /*free space */ );
     } else {
         /* truncate */
         if (S_ISDIR(inode->i_mode))
             reiserfs_warning(inode->i_sb, "green-2102",
                      "Adding a truncate savelink for "
                      "a directory %k! Please report",
                      INODE_PKEY(inode));
         set_cpu_key_k_offset(&key, 1);
         set_cpu_key_k_type(&key, TYPE_INDIRECT);
 
         /* item head of "safe" link */
         make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT,
                   4 /*length */ , 0 /*free space */ );
     }
     key.key_length = 3;
 
     /* look for its place in the tree */
     retval = search_item(inode->i_sb, &key, &path);
     if (retval != ITEM_NOT_FOUND) {
         if (retval != -ENOSPC)
             reiserfs_error(inode->i_sb, "vs-2100",
                        "search_by_key (%K) returned %d", &key,
                        retval);
         pathrelse(&path);
         return;
     }
 
     /* body of "save" link */
     link = INODE_PKEY(inode)->k_dir_id;
 
     /* put "save" link into tree, don't charge quota to anyone */
     retval =
         reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link);
     if (retval) {
         if (retval != -ENOSPC)
             reiserfs_error(inode->i_sb, "vs-2120",
                        "insert_item returned %d", retval);
     } else {
         if (truncate)
             REISERFS_I(inode)->i_flags |=
                 i_link_saved_truncate_mask;
         else
             REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
     }
 }
 
 /* this opens transaction unlike add_save_link */
 int remove_save_link(struct inode *inode, int truncate)
 {
     struct reiserfs_transaction_handle th;
     struct reiserfs_key key;
     int err;
 
     /* we are going to do one balancing only */
     err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
     if (err)
         return err;
 
     /* setup key of "save" link */
     key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
     key.k_objectid = INODE_PKEY(inode)->k_objectid;
     if (!truncate) {
         /* unlink, rmdir, rename */
         set_le_key_k_offset(KEY_FORMAT_3_5, &key,
                     1 + inode->i_sb->s_blocksize);
         set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
     } else {
         /* truncate */
         set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
         set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
     }
 
     if ((truncate &&
          (REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
         (!truncate &&
          (REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
         /* don't take quota bytes from anywhere */
         reiserfs_delete_solid_item(&th, NULL, &key);
     if (!truncate) {
         reiserfs_release_objectid(&th, inode->i_ino);
         REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
     } else
         REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
 
     return journal_end(&th);
 }
 
 static void reiserfs_kill_sb(struct super_block *s)
 {
     if (REISERFS_SB(s)) {
         reiserfs_proc_info_done(s);
         /*
          * Force any pending inode evictions to occur now. Any
          * inodes to be removed that have extended attributes
          * associated with them need to clean them up before
          * we can release the extended attribute root dentries.
          * shrink_dcache_for_umount will BUG if we don't release
          * those before it's called so ->put_super is too late.
          */
         shrink_dcache_sb(s);
 
         dput(REISERFS_SB(s)->xattr_root);
         REISERFS_SB(s)->xattr_root = NULL;
         dput(REISERFS_SB(s)->priv_root);
         REISERFS_SB(s)->priv_root = NULL;
     }
 
     kill_block_super(s);
 }
 
 #ifdef CONFIG_QUOTA
 static int reiserfs_quota_off(struct super_block *sb, int type);
 
 static void reiserfs_quota_off_umount(struct super_block *s)
 {
     int type;
 
     for (type = 0; type < REISERFS_MAXQUOTAS; type++)
         reiserfs_quota_off(s, type);
 }
 #else
 static inline void reiserfs_quota_off_umount(struct super_block *s)
 {
 }
 #endif
 
 static void reiserfs_put_super(struct super_block *s)
 {
     struct reiserfs_transaction_handle th;
     th.t_trans_id = 0;
 
     reiserfs_quota_off_umount(s);
 
     reiserfs_write_lock(s);
 
     /*
      * change file system state to current state if it was mounted
      * with read-write permissions
      */
     if (!sb_rdonly(s)) {
         if (!journal_begin(&th, s, 10)) {
             reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
                              1);
             set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
                         REISERFS_SB(s)->s_mount_state);
             journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
         }
     }
 
     /*
      * note, journal_release checks for readonly mount, and can
      * decide not to do a journal_end
      */
     journal_release(&th, s);
 
     reiserfs_free_bitmap_cache(s);
 
     brelse(SB_BUFFER_WITH_SB(s));
 
     print_statistics(s);
 
     if (REISERFS_SB(s)->reserved_blocks != 0) {
         reiserfs_warning(s, "green-2005", "reserved blocks left %d",
                  REISERFS_SB(s)->reserved_blocks);
     }
 
     reiserfs_write_unlock(s);
     mutex_destroy(&REISERFS_SB(s)->lock);
     destroy_workqueue(REISERFS_SB(s)->commit_wq);
     kfree(REISERFS_SB(s)->s_jdev);
     kfree(s->s_fs_info);
     s->s_fs_info = NULL;
 }
 
 static struct kmem_cache *reiserfs_inode_cachep;
 
 static struct inode *reiserfs_alloc_inode(struct super_block *sb)
 {
     struct reiserfs_inode_info *ei;
     ei = alloc_inode_sb(sb, reiserfs_inode_cachep, GFP_KERNEL);
     if (!ei)
         return NULL;
     atomic_set(&ei->openers, 0);
     mutex_init(&ei->tailpack);
 #ifdef CONFIG_QUOTA
     memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
 #endif
 
     return &ei->vfs_inode;
 }
 
 static void reiserfs_free_inode(struct inode *inode)
 {
     kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
 }
 
 static void init_once(void *foo)
 {
     struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
 
     INIT_LIST_HEAD(&ei->i_prealloc_list);
     inode_init_once(&ei->vfs_inode);
 }
 
 static int __init init_inodecache(void)
 {
     reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
                           sizeof(struct
                              reiserfs_inode_info),
                           0, (SLAB_RECLAIM_ACCOUNT|
                               SLAB_MEM_SPREAD|
                               SLAB_ACCOUNT),
                           init_once);
     if (reiserfs_inode_cachep == NULL)
         return -ENOMEM;
     return 0;
 }
 
 static void destroy_inodecache(void)
 {
     /*
      * Make sure all delayed rcu free inodes are flushed before we
      * destroy cache.
      */
     rcu_barrier();
     kmem_cache_destroy(reiserfs_inode_cachep);
 }
 
 /* we don't mark inodes dirty, we just log them */
 static void reiserfs_dirty_inode(struct inode *inode, int flags)
 {
     struct reiserfs_transaction_handle th;
 
     int err = 0;
 
     if (sb_rdonly(inode->i_sb)) {
         reiserfs_warning(inode->i_sb, "clm-6006",
                  "writing inode %lu on readonly FS",
                  inode->i_ino);
         return;
     }
     reiserfs_write_lock(inode->i_sb);
 
     /*
      * this is really only used for atime updates, so they don't have
      * to be included in O_SYNC or fsync
      */
     err = journal_begin(&th, inode->i_sb, 1);
     if (err)
         goto out;
 
     reiserfs_update_sd(&th, inode);
     journal_end(&th);
 
 out:
     reiserfs_write_unlock(inode->i_sb);
 }
 
 static int reiserfs_show_options(struct seq_file *seq, struct dentry *root)
 {
     struct super_block *s = root->d_sb;
     struct reiserfs_journal *journal = SB_JOURNAL(s);
     long opts = REISERFS_SB(s)->s_mount_opt;
 
     if (opts & (1 << REISERFS_LARGETAIL))
         seq_puts(seq, ",tails=on");
     else if (!(opts & (1 << REISERFS_SMALLTAIL)))
         seq_puts(seq, ",notail");
     /* tails=small is default so we don't show it */
 
     if (!(opts & (1 << REISERFS_BARRIER_FLUSH)))
         seq_puts(seq, ",barrier=none");
     /* barrier=flush is default so we don't show it */
 
     if (opts & (1 << REISERFS_ERROR_CONTINUE))
         seq_puts(seq, ",errors=continue");
     else if (opts & (1 << REISERFS_ERROR_PANIC))
         seq_puts(seq, ",errors=panic");
     /* errors=ro is default so we don't show it */
 
     if (opts & (1 << REISERFS_DATA_LOG))
         seq_puts(seq, ",data=journal");
     else if (opts & (1 << REISERFS_DATA_WRITEBACK))
         seq_puts(seq, ",data=writeback");
     /* data=ordered is default so we don't show it */
 
     if (opts & (1 << REISERFS_ATTRS))
         seq_puts(seq, ",attrs");
 
     if (opts & (1 << REISERFS_XATTRS_USER))
         seq_puts(seq, ",user_xattr");
 
     if (opts & (1 << REISERFS_EXPOSE_PRIVROOT))
         seq_puts(seq, ",expose_privroot");
 
     if (opts & (1 << REISERFS_POSIXACL))
         seq_puts(seq, ",acl");
 
     if (REISERFS_SB(s)->s_jdev)
         seq_show_option(seq, "jdev", REISERFS_SB(s)->s_jdev);
 
     if (journal->j_max_commit_age != journal->j_default_max_commit_age)
         seq_printf(seq, ",commit=%d", journal->j_max_commit_age);
 
 #ifdef CONFIG_QUOTA
     if (REISERFS_SB(s)->s_qf_names[USRQUOTA])
         seq_show_option(seq, "usrjquota",
                 REISERFS_SB(s)->s_qf_names[USRQUOTA]);
     else if (opts & (1 << REISERFS_USRQUOTA))
         seq_puts(seq, ",usrquota");
     if (REISERFS_SB(s)->s_qf_names[GRPQUOTA])
         seq_show_option(seq, "grpjquota",
                 REISERFS_SB(s)->s_qf_names[GRPQUOTA]);
     else if (opts & (1 << REISERFS_GRPQUOTA))
         seq_puts(seq, ",grpquota");
     if (REISERFS_SB(s)->s_jquota_fmt) {
         if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_OLD)
             seq_puts(seq, ",jqfmt=vfsold");
         else if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_V0)
             seq_puts(seq, ",jqfmt=vfsv0");
     }
 #endif
 
     /* Block allocator options */
     if (opts & (1 << REISERFS_NO_BORDER))
         seq_puts(seq, ",block-allocator=noborder");
     if (opts & (1 << REISERFS_NO_UNHASHED_RELOCATION))
         seq_puts(seq, ",block-allocator=no_unhashed_relocation");
     if (opts & (1 << REISERFS_HASHED_RELOCATION))
         seq_puts(seq, ",block-allocator=hashed_relocation");
     if (opts & (1 << REISERFS_TEST4))
         seq_puts(seq, ",block-allocator=test4");
     show_alloc_options(seq, s);
     return 0;
 }
 
 #ifdef CONFIG_QUOTA
 static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
                     size_t, loff_t);
 static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
                    loff_t);
 
 static struct dquot **reiserfs_get_dquots(struct inode *inode)
 {
     return REISERFS_I(inode)->i_dquot;
 }
 #endif
 
 static const struct super_operations reiserfs_sops = {
     .alloc_inode = reiserfs_alloc_inode,
     .free_inode = reiserfs_free_inode,
     .write_inode = reiserfs_write_inode,
     .dirty_inode = reiserfs_dirty_inode,
     .evict_inode = reiserfs_evict_inode,
     .put_super = reiserfs_put_super,
     .sync_fs = reiserfs_sync_fs,
     .freeze_fs = reiserfs_freeze,
     .unfreeze_fs = reiserfs_unfreeze,
     .statfs = reiserfs_statfs,
     .remount_fs = reiserfs_remount,
     .show_options = reiserfs_show_options,
 #ifdef CONFIG_QUOTA
     .quota_read = reiserfs_quota_read,
     .quota_write = reiserfs_quota_write,
     .get_dquots = reiserfs_get_dquots,
 #endif
 };
 
 #ifdef CONFIG_QUOTA
 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
 
 static int reiserfs_write_dquot(struct dquot *);
 static int reiserfs_acquire_dquot(struct dquot *);
 static int reiserfs_release_dquot(struct dquot *);
 static int reiserfs_mark_dquot_dirty(struct dquot *);
 static int reiserfs_write_info(struct super_block *, int);
 static int reiserfs_quota_on(struct super_block *, int, int, const struct path *);
 
 static const struct dquot_operations reiserfs_quota_operations = {
     .write_dquot = reiserfs_write_dquot,
     .acquire_dquot = reiserfs_acquire_dquot,
     .release_dquot = reiserfs_release_dquot,
     .mark_dirty = reiserfs_mark_dquot_dirty,
     .write_info = reiserfs_write_info,
     .alloc_dquot    = dquot_alloc,
     .destroy_dquot  = dquot_destroy,
     .get_next_id    = dquot_get_next_id,
 };
 
 static const struct quotactl_ops reiserfs_qctl_operations = {
     .quota_on = reiserfs_quota_on,
     .quota_off = reiserfs_quota_off,
     .quota_sync = dquot_quota_sync,
     .get_state = dquot_get_state,
     .set_info = dquot_set_dqinfo,
     .get_dqblk = dquot_get_dqblk,
     .set_dqblk = dquot_set_dqblk,
 };
 #endif
 
 static const struct export_operations reiserfs_export_ops = {
     .encode_fh = reiserfs_encode_fh,
     .fh_to_dentry = reiserfs_fh_to_dentry,
     .fh_to_parent = reiserfs_fh_to_parent,
     .get_parent = reiserfs_get_parent,
 };
 
 /*
  * this struct is used in reiserfs_getopt () for containing the value for
  * those mount options that have values rather than being toggles.
  */
 typedef struct {
     char *value;
     /*
      * bitmask which is to set on mount_options bitmask
      * when this value is found, 0 is no bits are to be changed.
      */
     int setmask;
     /*
      * bitmask which is to clear on mount_options bitmask
      * when this value is found, 0 is no bits are to be changed.
      * This is applied BEFORE setmask
      */
     int clrmask;
 } arg_desc_t;
 
 /* Set this bit in arg_required to allow empty arguments */
 #define REISERFS_OPT_ALLOWEMPTY 31
 
 /*
  * this struct is used in reiserfs_getopt() for describing the
  * set of reiserfs mount options
  */
 typedef struct {
     char *option_name;
 
     /* 0 if argument is not required, not 0 otherwise */
     int arg_required;
 
     /* list of values accepted by an option */
     const arg_desc_t *values;
 
     /*
      * bitmask which is to set on mount_options bitmask
      * when this value is found, 0 is no bits are to be changed.
      */
     int setmask;
 
     /*
      * bitmask which is to clear on mount_options bitmask
      * when this value is found, 0 is no bits are to be changed.
      * This is applied BEFORE setmask
      */
     int clrmask;
 } opt_desc_t;
 
 /* possible values for -o data= */
 static const arg_desc_t logging_mode[] = {
     {"ordered", 1 << REISERFS_DATA_ORDERED,
      (1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
     {"journal", 1 << REISERFS_DATA_LOG,
      (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
     {"writeback", 1 << REISERFS_DATA_WRITEBACK,
      (1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
     {.value = NULL}
 };
 
 /* possible values for -o barrier= */
 static const arg_desc_t barrier_mode[] = {
     {"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
     {"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
     {.value = NULL}
 };
 
 /*
  * possible values for "-o block-allocator=" and bits which are to be set in
  * s_mount_opt of reiserfs specific part of in-core super block
  */
 static const arg_desc_t balloc[] = {
     {"noborder", 1 << REISERFS_NO_BORDER, 0},
     {"border", 0, 1 << REISERFS_NO_BORDER},
     {"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
     {"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
     {"test4", 1 << REISERFS_TEST4, 0},
     {"notest4", 0, 1 << REISERFS_TEST4},
     {NULL, 0, 0}
 };
 
 static const arg_desc_t tails[] = {
     {"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
     {"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
     {"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
     {NULL, 0, 0}
 };
 
 static const arg_desc_t error_actions[] = {
     {"panic", 1 << REISERFS_ERROR_PANIC,
      (1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
     {"ro-remount", 1 << REISERFS_ERROR_RO,
      (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
 #ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
     {"continue", 1 << REISERFS_ERROR_CONTINUE,
      (1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
 #endif
     {NULL, 0, 0},
 };
 
 /*
  * proceed only one option from a list *cur - string containing of mount
  * options
  * opts - array of options which are accepted
  * opt_arg - if option is found and requires an argument and if it is specifed
  * in the input - pointer to the argument is stored here
  * bit_flags - if option requires to set a certain bit - it is set here
  * return -1 if unknown option is found, opt->arg_required otherwise
  */
 static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
                char **opt_arg, unsigned long *bit_flags)
 {
     char *p;
     /*
      * foo=bar,
      * ^   ^  ^
      * |   |  +-- option_end
      * |   +-- arg_start
      * +-- option_start
      */
     const opt_desc_t *opt;
     const arg_desc_t *arg;
 
     p = *cur;
 
     /* assume argument cannot contain commas */
     *cur = strchr(p, ',');
     if (*cur) {
         *(*cur) = '\0';
         (*cur)++;
     }
 
     if (!strncmp(p, "alloc=", 6)) {
         /*
          * Ugly special case, probably we should redo options
          * parser so that it can understand several arguments for
          * some options, also so that it can fill several bitfields
          * with option values.
          */
         if (reiserfs_parse_alloc_options(s, p + 6)) {
             return -1;
         } else {
             return 0;
         }
     }
 
     /* for every option in the list */
     for (opt = opts; opt->option_name; opt++) {
         if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
             if (bit_flags) {
                 if (opt->clrmask ==
                     (1 << REISERFS_UNSUPPORTED_OPT))
                     reiserfs_warning(s, "super-6500",
                              "%s not supported.\n",
                              p);
                 else
                     *bit_flags &= ~opt->clrmask;
                 if (opt->setmask ==
                     (1 << REISERFS_UNSUPPORTED_OPT))
                     reiserfs_warning(s, "super-6501",
                              "%s not supported.\n",
                              p);
                 else
                     *bit_flags |= opt->setmask;
             }
             break;
         }
     }
     if (!opt->option_name) {
         reiserfs_warning(s, "super-6502",
                  "unknown mount option \"%s\"", p);
         return -1;
     }
 
     p += strlen(opt->option_name);
     switch (*p) {
     case '=':
         if (!opt->arg_required) {
             reiserfs_warning(s, "super-6503",
                      "the option \"%s\" does not "
                      "require an argument\n",
                      opt->option_name);
             return -1;
         }
         break;
 
     case 0:
         if (opt->arg_required) {
             reiserfs_warning(s, "super-6504",
                      "the option \"%s\" requires an "
                      "argument\n", opt->option_name);
             return -1;
         }
         break;
     default:
         reiserfs_warning(s, "super-6505",
                  "head of option \"%s\" is only correct\n",
                  opt->option_name);
         return -1;
     }
 
     /*
      * move to the argument, or to next option if argument is not
      * required
      */
     p++;
 
     if (opt->arg_required
         && !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
         && !strlen(p)) {
         /* this catches "option=," if not allowed */
         reiserfs_warning(s, "super-6506",
                  "empty argument for \"%s\"\n",
                  opt->option_name);
         return -1;
     }
 
     if (!opt->values) {
         /* *=NULLopt_arg contains pointer to argument */
         *opt_arg = p;
         return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
     }
 
     /* values possible for this option are listed in opt->values */
     for (arg = opt->values; arg->value; arg++) {
         if (!strcmp(p, arg->value)) {
             if (bit_flags) {
                 *bit_flags &= ~arg->clrmask;
                 *bit_flags |= arg->setmask;
             }
             return opt->arg_required;
         }
     }
 
     reiserfs_warning(s, "super-6506",
              "bad value \"%s\" for option \"%s\"\n", p,
              opt->option_name);
     return -1;
 }
 
 /* returns 0 if something is wrong in option string, 1 - otherwise */
 static int reiserfs_parse_options(struct super_block *s,
 
                   /* string given via mount's -o */
                   char *options,
 
                   /*
                    * after the parsing phase, contains the
                    * collection of bitflags defining what
                    * mount options were selected.
                    */
                   unsigned long *mount_options,
 
                   /* strtol-ed from NNN of resize=NNN */
                   unsigned long *blocks,
                   char **jdev_name,
                   unsigned int *commit_max_age,
                   char **qf_names,
                   unsigned int *qfmt)
 {
     int c;
     char *arg = NULL;
     char *pos;
     opt_desc_t opts[] = {
         /*
          * Compatibility stuff, so that -o notail for old
          * setups still work
          */
         {"tails",.arg_required = 't',.values = tails},
         {"notail",.clrmask =
          (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
         {"conv",.setmask = 1 << REISERFS_CONVERT},
         {"attrs",.setmask = 1 << REISERFS_ATTRS},
         {"noattrs",.clrmask = 1 << REISERFS_ATTRS},
         {"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
 #ifdef CONFIG_REISERFS_FS_XATTR
         {"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
         {"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
 #else
         {"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
         {"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
 #endif
 #ifdef CONFIG_REISERFS_FS_POSIX_ACL
         {"acl",.setmask = 1 << REISERFS_POSIXACL},
         {"noacl",.clrmask = 1 << REISERFS_POSIXACL},
 #else
         {"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
         {"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
 #endif
         {.option_name = "nolog"},
         {"replayonly",.setmask = 1 << REPLAYONLY},
         {"block-allocator",.arg_required = 'a',.values = balloc},
         {"data",.arg_required = 'd',.values = logging_mode},
         {"barrier",.arg_required = 'b',.values = barrier_mode},
         {"resize",.arg_required = 'r',.values = NULL},
         {"jdev",.arg_required = 'j',.values = NULL},
         {"nolargeio",.arg_required = 'w',.values = NULL},
         {"commit",.arg_required = 'c',.values = NULL},
         {"usrquota",.setmask = 1 << REISERFS_USRQUOTA},
         {"grpquota",.setmask = 1 << REISERFS_GRPQUOTA},
         {"noquota",.clrmask = 1 << REISERFS_USRQUOTA | 1 << REISERFS_GRPQUOTA},
         {"errors",.arg_required = 'e',.values = error_actions},
         {"usrjquota",.arg_required =
          'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
         {"grpjquota",.arg_required =
          'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
         {"jqfmt",.arg_required = 'f',.values = NULL},
         {.option_name = NULL}
     };
 
     *blocks = 0;
     if (!options || !*options)
         /*
          * use default configuration: create tails, journaling on, no
          * conversion to newest format
          */
         return 1;
 
     for (pos = options; pos;) {
         c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
         if (c == -1)
             /* wrong option is given */
             return 0;
 
         if (c == 'r') {
             char *p;
 
             p = NULL;
             /* "resize=NNN" or "resize=auto" */
 
             if (!strcmp(arg, "auto")) {
                 /* From JFS code, to auto-get the size. */
                 *blocks = sb_bdev_nr_blocks(s);
             } else {
                 *blocks = simple_strtoul(arg, &p, 0);
                 if (*p != '\0') {
                     /* NNN does not look like a number */
                     reiserfs_warning(s, "super-6507",
                              "bad value %s for "
                              "-oresize\n", arg);
                     return 0;
                 }
             }
         }
 
         if (c == 'c') {
             char *p = NULL;
             unsigned long val = simple_strtoul(arg, &p, 0);
             /* commit=NNN (time in seconds) */
             if (*p != '\0' || val >= (unsigned int)-1) {
                 reiserfs_warning(s, "super-6508",
                          "bad value %s for -ocommit\n",
                          arg);
                 return 0;
             }
             *commit_max_age = (unsigned int)val;
         }
 
         if (c == 'w') {
             reiserfs_warning(s, "super-6509", "nolargeio option "
                      "is no longer supported");
             return 0;
         }
 
         if (c == 'j') {
             if (arg && *arg && jdev_name) {
                 /* Hm, already assigned? */
                 if (*jdev_name) {
                     reiserfs_warning(s, "super-6510",
                              "journal device was "
                              "already specified to "
                              "be %s", *jdev_name);
                     return 0;
                 }
                 *jdev_name = arg;
             }
         }
 #ifdef CONFIG_QUOTA
         if (c == 'u' || c == 'g') {
             int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
 
             if (sb_any_quota_loaded(s) &&
                 (!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
                 reiserfs_warning(s, "super-6511",
                          "cannot change journaled "
                          "quota options when quota "
                          "turned on.");
                 return 0;
             }
             if (qf_names[qtype] !=
                 REISERFS_SB(s)->s_qf_names[qtype])
                 kfree(qf_names[qtype]);
             qf_names[qtype] = NULL;
             if (*arg) { /* Some filename specified? */
                 if (REISERFS_SB(s)->s_qf_names[qtype]
                     && strcmp(REISERFS_SB(s)->s_qf_names[qtype],
                           arg)) {
                     reiserfs_warning(s, "super-6512",
                              "%s quota file "
                              "already specified.",
                              QTYPE2NAME(qtype));
                     return 0;
                 }
                 if (strchr(arg, '/')) {
                     reiserfs_warning(s, "super-6513",
                              "quotafile must be "
                              "on filesystem root.");
                     return 0;
                 }
                 qf_names[qtype] = kstrdup(arg, GFP_KERNEL);
                 if (!qf_names[qtype]) {
                     reiserfs_warning(s, "reiserfs-2502",
                              "not enough memory "
                              "for storing "
                              "quotafile name.");
                     return 0;
                 }
                 if (qtype == USRQUOTA)
                     *mount_options |= 1 << REISERFS_USRQUOTA;
                 else
                     *mount_options |= 1 << REISERFS_GRPQUOTA;
             } else {
                 if (qtype == USRQUOTA)
                     *mount_options &= ~(1 << REISERFS_USRQUOTA);
                 else
                     *mount_options &= ~(1 << REISERFS_GRPQUOTA);
             }
         }
         if (c == 'f') {
             if (!strcmp(arg, "vfsold"))
                 *qfmt = QFMT_VFS_OLD;
             else if (!strcmp(arg, "vfsv0"))
                 *qfmt = QFMT_VFS_V0;
             else {
                 reiserfs_warning(s, "super-6514",
                          "unknown quota format "
                          "specified.");
                 return 0;
             }
             if (sb_any_quota_loaded(s) &&
                 *qfmt != REISERFS_SB(s)->s_jquota_fmt) {
                 reiserfs_warning(s, "super-6515",
                          "cannot change journaled "
                          "quota options when quota "
                          "turned on.");
                 return 0;
             }
         }
 #else
         if (c == 'u' || c == 'g' || c == 'f') {
             reiserfs_warning(s, "reiserfs-2503", "journaled "
                      "quota options not supported.");
             return 0;
         }
 #endif
     }
 
 #ifdef CONFIG_QUOTA
     if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
         && (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
         reiserfs_warning(s, "super-6515",
                  "journaled quota format not specified.");
         return 0;
     }
     if ((!(*mount_options & (1 << REISERFS_USRQUOTA)) &&
            sb_has_quota_loaded(s, USRQUOTA)) ||
         (!(*mount_options & (1 << REISERFS_GRPQUOTA)) &&
            sb_has_quota_loaded(s, GRPQUOTA))) {
         reiserfs_warning(s, "super-6516", "quota options must "
                  "be present when quota is turned on.");
         return 0;
     }
 #endif
 
     return 1;
 }
 
 static void switch_data_mode(struct super_block *s, unsigned long mode)
 {
     REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
                      (1 << REISERFS_DATA_ORDERED) |
                      (1 << REISERFS_DATA_WRITEBACK));
     REISERFS_SB(s)->s_mount_opt |= (1 << mode);
 }
 
 static void handle_data_mode(struct super_block *s, unsigned long mount_options)
 {
     if (mount_options & (1 << REISERFS_DATA_LOG)) {
         if (!reiserfs_data_log(s)) {
             switch_data_mode(s, REISERFS_DATA_LOG);
             reiserfs_info(s, "switching to journaled data mode\n");
         }
     } else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
         if (!reiserfs_data_ordered(s)) {
             switch_data_mode(s, REISERFS_DATA_ORDERED);
             reiserfs_info(s, "switching to ordered data mode\n");
         }
     } else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
         if (!reiserfs_data_writeback(s)) {
             switch_data_mode(s, REISERFS_DATA_WRITEBACK);
             reiserfs_info(s, "switching to writeback data mode\n");
         }
     }
 }
 
 static void handle_barrier_mode(struct super_block *s, unsigned long bits)
 {
     int flush = (1 << REISERFS_BARRIER_FLUSH);
     int none = (1 << REISERFS_BARRIER_NONE);
     int all_barrier = flush | none;
 
     if (bits & all_barrier) {
         REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
         if (bits & flush) {
             REISERFS_SB(s)->s_mount_opt |= flush;
             printk("reiserfs: enabling write barrier flush mode\n");
         } else if (bits & none) {
             REISERFS_SB(s)->s_mount_opt |= none;
             printk("reiserfs: write barriers turned off\n");
         }
     }
 }
 
 static void handle_attrs(struct super_block *s)
 {
     struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
 
     if (reiserfs_attrs(s)) {
         if (old_format_only(s)) {
             reiserfs_warning(s, "super-6517", "cannot support "
                      "attributes on 3.5.x disk format");
             REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
             return;
         }
         if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
             reiserfs_warning(s, "super-6518", "cannot support "
                      "attributes until flag is set in "
                      "super-block");
             REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
         }
     }
 }
 
 #ifdef CONFIG_QUOTA
 static void handle_quota_files(struct super_block *s, char **qf_names,
                    unsigned int *qfmt)
 {
     int i;
 
     for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
         if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
             kfree(REISERFS_SB(s)->s_qf_names[i]);
         REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
     }
     if (*qfmt)
         REISERFS_SB(s)->s_jquota_fmt = *qfmt;
 }
 #endif
 
 static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
 {
     struct reiserfs_super_block *rs;
     struct reiserfs_transaction_handle th;
     unsigned long blocks;
     unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
     unsigned long safe_mask = 0;
     unsigned int commit_max_age = (unsigned int)-1;
     struct reiserfs_journal *journal = SB_JOURNAL(s);
     int err;
     char *qf_names[REISERFS_MAXQUOTAS];
     unsigned int qfmt = 0;
 #ifdef CONFIG_QUOTA
     int i;
 #endif
 
     sync_filesystem(s);
     reiserfs_write_lock(s);
 
 #ifdef CONFIG_QUOTA
     memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
 #endif
 
     rs = SB_DISK_SUPER_BLOCK(s);
 
     if (!reiserfs_parse_options
         (s, arg, &mount_options, &blocks, NULL, &commit_max_age,
         qf_names, &qfmt)) {
 #ifdef CONFIG_QUOTA
         for (i = 0; i < REISERFS_MAXQUOTAS; i++)
             if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
                 kfree(qf_names[i]);
 #endif
         err = -EINVAL;
         goto out_err_unlock;
     }
 #ifdef CONFIG_QUOTA
     handle_quota_files(s, qf_names, &qfmt);
 #endif
 
     handle_attrs(s);
 
     /* Add options that are safe here */
     safe_mask |= 1 << REISERFS_SMALLTAIL;
     safe_mask |= 1 << REISERFS_LARGETAIL;
     safe_mask |= 1 << REISERFS_NO_BORDER;
     safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
     safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
     safe_mask |= 1 << REISERFS_TEST4;
     safe_mask |= 1 << REISERFS_ATTRS;
     safe_mask |= 1 << REISERFS_XATTRS_USER;
     safe_mask |= 1 << REISERFS_POSIXACL;
     safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
     safe_mask |= 1 << REISERFS_BARRIER_NONE;
     safe_mask |= 1 << REISERFS_ERROR_RO;
     safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
     safe_mask |= 1 << REISERFS_ERROR_PANIC;
     safe_mask |= 1 << REISERFS_USRQUOTA;
     safe_mask |= 1 << REISERFS_GRPQUOTA;
 
     /*
      * Update the bitmask, taking care to keep
      * the bits we're not allowed to change here
      */
     REISERFS_SB(s)->s_mount_opt =
         (REISERFS_SB(s)->
          s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
 
     if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
         journal->j_max_commit_age = commit_max_age;
         journal->j_max_trans_age = commit_max_age;
     } else if (commit_max_age == 0) {
         /* 0 means restore defaults. */
         journal->j_max_commit_age = journal->j_default_max_commit_age;
         journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
     }
 
     if (blocks) {
         err = reiserfs_resize(s, blocks);
         if (err != 0)
             goto out_err_unlock;
     }
 
     if (*mount_flags & SB_RDONLY) {
         reiserfs_write_unlock(s);
         reiserfs_xattr_init(s, *mount_flags);
         /* remount read-only */
         if (sb_rdonly(s))
             /* it is read-only already */
             goto out_ok_unlocked;
 
         err = dquot_suspend(s, -1);
         if (err < 0)
             goto out_err;
 
         /* try to remount file system with read-only permissions */
         if (sb_umount_state(rs) == REISERFS_VALID_FS
             || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
             goto out_ok_unlocked;
         }
 
         reiserfs_write_lock(s);
 
         err = journal_begin(&th, s, 10);
         if (err)
             goto out_err_unlock;
 
         /* Mounting a rw partition read-only. */
         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
         set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
         journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
     } else {
         /* remount read-write */
         if (!sb_rdonly(s)) {
             reiserfs_write_unlock(s);
             reiserfs_xattr_init(s, *mount_flags);
             goto out_ok_unlocked;   /* We are read-write already */
         }
 
         if (reiserfs_is_journal_aborted(journal)) {
             err = journal->j_errno;
             goto out_err_unlock;
         }
 
         handle_data_mode(s, mount_options);
         handle_barrier_mode(s, mount_options);
         REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
 
         /* now it is safe to call journal_begin */
         s->s_flags &= ~SB_RDONLY;
         err = journal_begin(&th, s, 10);
         if (err)
             goto out_err_unlock;
 
         /* Mount a partition which is read-only, read-write */
         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
         REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
         s->s_flags &= ~SB_RDONLY;
         set_sb_umount_state(rs, REISERFS_ERROR_FS);
         if (!old_format_only(s))
             set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
         /* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
         journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
         REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
     }
     /* this will force a full flush of all journal lists */
     SB_JOURNAL(s)->j_must_wait = 1;
     err = journal_end(&th);
     if (err)
         goto out_err_unlock;
 
     reiserfs_write_unlock(s);
     if (!(*mount_flags & SB_RDONLY)) {
         dquot_resume(s, -1);
         reiserfs_write_lock(s);
         finish_unfinished(s);
         reiserfs_write_unlock(s);
         reiserfs_xattr_init(s, *mount_flags);
     }
 
 out_ok_unlocked:
     return 0;
 
 out_err_unlock:
     reiserfs_write_unlock(s);
 out_err:
     return err;
 }
 
 static int read_super_block(struct super_block *s, int offset)
 {
     struct buffer_head *bh;
     struct reiserfs_super_block *rs;
     int fs_blocksize;
 
     bh = sb_bread(s, offset / s->s_blocksize);
     if (!bh) {
         reiserfs_warning(s, "sh-2006",
                  "bread failed (dev %s, block %lu, size %lu)",
                  s->s_id, offset / s->s_blocksize,
                  s->s_blocksize);
         return 1;
     }
 
     rs = (struct reiserfs_super_block *)bh->b_data;
     if (!is_any_reiserfs_magic_string(rs)) {
         brelse(bh);
         return 1;
     }
     /*
      * ok, reiserfs signature (old or new) found in at the given offset
      */
     fs_blocksize = sb_blocksize(rs);
     brelse(bh);
     sb_set_blocksize(s, fs_blocksize);
 
     bh = sb_bread(s, offset / s->s_blocksize);
     if (!bh) {
         reiserfs_warning(s, "sh-2007",
                  "bread failed (dev %s, block %lu, size %lu)",
                  s->s_id, offset / s->s_blocksize,
                  s->s_blocksize);
         return 1;
     }
 
     rs = (struct reiserfs_super_block *)bh->b_data;
     if (sb_blocksize(rs) != s->s_blocksize) {
         reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
                  "filesystem on (dev %s, block %llu, size %lu)",
                  s->s_id,
                  (unsigned long long)bh->b_blocknr,
                  s->s_blocksize);
         brelse(bh);
         return 1;
     }
 
     if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
         brelse(bh);
         reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
                  "--rebuild-tree run detected. Please run\n"
                  "reiserfsck --rebuild-tree and wait for a "
                  "completion. If that fails\n"
                  "get newer reiserfsprogs package");
         return 1;
     }
 
     reiserfs_warning(NULL, "", "reiserfs filesystem is deprecated and "
         "scheduled to be removed from the kernel in 2025");
     SB_BUFFER_WITH_SB(s) = bh;
     SB_DISK_SUPER_BLOCK(s) = rs;
 
     /*
      * magic is of non-standard journal filesystem, look at s_version to
      * find which format is in use
      */
     if (is_reiserfs_jr(rs)) {
         if (sb_version(rs) == REISERFS_VERSION_2)
             reiserfs_info(s, "found reiserfs format \"3.6\""
                       " with non-standard journal\n");
         else if (sb_version(rs) == REISERFS_VERSION_1)
             reiserfs_info(s, "found reiserfs format \"3.5\""
                       " with non-standard journal\n");
         else {
             reiserfs_warning(s, "sh-2012", "found unknown "
                      "format \"%u\" of reiserfs with "
                      "non-standard magic", sb_version(rs));
             return 1;
         }
     } else
         /*
          * s_version of standard format may contain incorrect
          * information, so we just look at the magic string
          */
         reiserfs_info(s,
                   "found reiserfs format \"%s\" with standard journal\n",
                   is_reiserfs_3_5(rs) ? "3.5" : "3.6");
 
     s->s_op = &reiserfs_sops;
     s->s_export_op = &reiserfs_export_ops;
 #ifdef CONFIG_QUOTA
     s->s_qcop = &reiserfs_qctl_operations;
     s->dq_op = &reiserfs_quota_operations;
     s->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
 #endif
 
     /*
      * new format is limited by the 32 bit wide i_blocks field, want to
      * be one full block below that.
      */
     s->s_maxbytes = (512LL << 32) - s->s_blocksize;
     return 0;
 }
 
 /* after journal replay, reread all bitmap and super blocks */
 static int reread_meta_blocks(struct super_block *s)
 {
     ll_rw_block(REQ_OP_READ, 1, &SB_BUFFER_WITH_SB(s));
     wait_on_buffer(SB_BUFFER_WITH_SB(s));
     if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
         reiserfs_warning(s, "reiserfs-2504", "error reading the super");
         return 1;
     }
 
     return 0;
 }
 
 /* hash detection stuff */
 
 /*
  * if root directory is empty - we set default - Yura's - hash and
  * warn about it
  * FIXME: we look for only one name in a directory. If tea and yura
  * both have the same value - we ask user to send report to the
  * mailing list
  */
 static __u32 find_hash_out(struct super_block *s)
 {
     int retval;
     struct inode *inode;
     struct cpu_key key;
     INITIALIZE_PATH(path);
     struct reiserfs_dir_entry de;
     struct reiserfs_de_head *deh;
     __u32 hash = DEFAULT_HASH;
     __u32 deh_hashval, teahash, r5hash, yurahash;
 
     inode = d_inode(s->s_root);
 
     make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
     retval = search_by_entry_key(s, &key, &path, &de);
     if (retval == IO_ERROR) {
         pathrelse(&path);
         return UNSET_HASH;
     }
     if (retval == NAME_NOT_FOUND)
         de.de_entry_num--;
 
     set_de_name_and_namelen(&de);
     deh = de.de_deh + de.de_entry_num;
 
     if (deh_offset(deh) == DOT_DOT_OFFSET) {
         /* allow override in this case */
         if (reiserfs_rupasov_hash(s))
             hash = YURA_HASH;
         reiserfs_info(s, "FS seems to be empty, autodetect is using the default hash\n");
         goto out;
     }
 
     deh_hashval = GET_HASH_VALUE(deh_offset(deh));
     r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
     teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
     yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
 
     if ((teahash == r5hash && deh_hashval == r5hash) ||
         (teahash == yurahash && deh_hashval == yurahash) ||
         (r5hash == yurahash && deh_hashval == yurahash)) {
         reiserfs_warning(s, "reiserfs-2506",
                  "Unable to automatically detect hash "
                  "function. Please mount with -o "
                  "hash={tea,rupasov,r5}");
         hash = UNSET_HASH;
         goto out;
     }
 
     if (deh_hashval == yurahash)
         hash = YURA_HASH;
     else if (deh_hashval == teahash)
         hash = TEA_HASH;
     else if (deh_hashval == r5hash)
         hash = R5_HASH;
     else {
         reiserfs_warning(s, "reiserfs-2506",
                  "Unrecognised hash function");
         hash = UNSET_HASH;
     }
 out:
     pathrelse(&path);
     return hash;
 }
 
 /* finds out which hash names are sorted with */
 static int what_hash(struct super_block *s)
 {
     __u32 code;
 
     code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
 
     /*
      * reiserfs_hash_detect() == true if any of the hash mount options
      * were used.  We must check them to make sure the user isn't
      * using a bad hash value
      */
     if (code == UNSET_HASH || reiserfs_hash_detect(s))
         code = find_hash_out(s);
 
     if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
         /*
          * detection has found the hash, and we must check against the
          * mount options
          */
         if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
             reiserfs_warning(s, "reiserfs-2507",
                      "Error, %s hash detected, "
                      "unable to force rupasov hash",
                      reiserfs_hashname(code));
             code = UNSET_HASH;
         } else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
             reiserfs_warning(s, "reiserfs-2508",
                      "Error, %s hash detected, "
                      "unable to force tea hash",
                      reiserfs_hashname(code));
             code = UNSET_HASH;
         } else if (reiserfs_r5_hash(s) && code != R5_HASH) {
             reiserfs_warning(s, "reiserfs-2509",
                      "Error, %s hash detected, "
                      "unable to force r5 hash",
                      reiserfs_hashname(code));
             code = UNSET_HASH;
         }
     } else {
         /*
          * find_hash_out was not called or
          * could not determine the hash
          */
         if (reiserfs_rupasov_hash(s)) {
             code = YURA_HASH;
         } else if (reiserfs_tea_hash(s)) {
             code = TEA_HASH;
         } else if (reiserfs_r5_hash(s)) {
             code = R5_HASH;
         }
     }
 
     /*
      * if we are mounted RW, and we have a new valid hash code, update
      * the super
      */
     if (code != UNSET_HASH &&
         !sb_rdonly(s) &&
         code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
         set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
     }
     return code;
 }
 
 /* return pointer to appropriate function */
 static hashf_t hash_function(struct super_block *s)
 {
     switch (what_hash(s)) {
     case TEA_HASH:
         reiserfs_info(s, "Using tea hash to sort names\n");
         return keyed_hash;
     case YURA_HASH:
         reiserfs_info(s, "Using rupasov hash to sort names\n");
         return yura_hash;
     case R5_HASH:
         reiserfs_info(s, "Using r5 hash to sort names\n");
         return r5_hash;
     }
     return NULL;
 }
 
 /* this is used to set up correct value for old partitions */
 static int function2code(hashf_t func)
 {
     if (func == keyed_hash)
         return TEA_HASH;
     if (func == yura_hash)
         return YURA_HASH;
     if (func == r5_hash)
         return R5_HASH;
 
     BUG();          /* should never happen */
 
     return 0;
 }
 
 #define SWARN(silent, s, id, ...)           \
     if (!(silent))              \
         reiserfs_warning(s, id, __VA_ARGS__)
 
 static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
 {
     struct inode *root_inode;
     struct reiserfs_transaction_handle th;
     int old_format = 0;
     unsigned long blocks;
     unsigned int commit_max_age = 0;
     int jinit_done = 0;
     struct reiserfs_iget_args args;
     struct reiserfs_super_block *rs;
     char *jdev_name;
     struct reiserfs_sb_info *sbi;
     int errval = -EINVAL;
     char *qf_names[REISERFS_MAXQUOTAS] = {};
     unsigned int qfmt = 0;
 
     sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
     if (!sbi)
         return -ENOMEM;
     s->s_fs_info = sbi;
     /* Set default values for options: non-aggressive tails, RO on errors */
     sbi->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
     sbi->s_mount_opt |= (1 << REISERFS_ERROR_RO);
     sbi->s_mount_opt |= (1 << REISERFS_BARRIER_FLUSH);
     /* no preallocation minimum, be smart in reiserfs_file_write instead */
     sbi->s_alloc_options.preallocmin = 0;
     /* Preallocate by 16 blocks (17-1) at once */
     sbi->s_alloc_options.preallocsize = 17;
     /* setup default block allocator options */
     reiserfs_init_alloc_options(s);
 
     spin_lock_init(&sbi->old_work_lock);
     INIT_DELAYED_WORK(&sbi->old_work, flush_old_commits);
     mutex_init(&sbi->lock);
     sbi->lock_depth = -1;
 
     sbi->commit_wq = alloc_workqueue("reiserfs/%s", WQ_MEM_RECLAIM, 0,
                      s->s_id);
     if (!sbi->commit_wq) {
         SWARN(silent, s, "", "Cannot allocate commit workqueue");
         errval = -ENOMEM;
         goto error_unlocked;
     }
 
     jdev_name = NULL;
     if (reiserfs_parse_options
         (s, (char *)data, &sbi->s_mount_opt, &blocks, &jdev_name,
          &commit_max_age, qf_names, &qfmt) == 0) {
         goto error_unlocked;
     }
     if (jdev_name && jdev_name[0]) {
         sbi->s_jdev = kstrdup(jdev_name, GFP_KERNEL);
         if (!sbi->s_jdev) {
             SWARN(silent, s, "", "Cannot allocate memory for "
                 "journal device name");
             goto error_unlocked;
         }
     }
 #ifdef CONFIG_QUOTA
     handle_quota_files(s, qf_names, &qfmt);
 #endif
 
     if (blocks) {
         SWARN(silent, s, "jmacd-7", "resize option for remount only");
         goto error_unlocked;
     }
 
     /*
      * try old format (undistributed bitmap, super block in 8-th 1k
      * block of a device)
      */
     if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
         old_format = 1;
 
     /*
      * try new format (64-th 1k block), which can contain reiserfs
      * super block
      */
     else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
         SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
               s->s_id);
         goto error_unlocked;
     }
 
     s->s_time_min = 0;
     s->s_time_max = U32_MAX;
 
     rs = SB_DISK_SUPER_BLOCK(s);
     /*
      * Let's do basic sanity check to verify that underlying device is not
      * smaller than the filesystem. If the check fails then abort and
      * scream, because bad stuff will happen otherwise.
      */
     if (bdev_nr_bytes(s->s_bdev) < sb_block_count(rs) * sb_blocksize(rs)) {
         SWARN(silent, s, "", "Filesystem cannot be "
               "mounted because it is bigger than the device");
         SWARN(silent, s, "", "You may need to run fsck "
               "or increase size of your LVM partition");
         SWARN(silent, s, "", "Or may be you forgot to "
               "reboot after fdisk when it told you to");
         goto error_unlocked;
     }
 
     sbi->s_mount_state = SB_REISERFS_STATE(s);
     sbi->s_mount_state = REISERFS_VALID_FS;
 
     if ((errval = reiserfs_init_bitmap_cache(s))) {
         SWARN(silent, s, "jmacd-8", "unable to read bitmap");
         goto error_unlocked;
     }
 
     errval = -EINVAL;
 #ifdef CONFIG_REISERFS_CHECK
     SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
     SWARN(silent, s, "", "- it is slow mode for debugging.");
 #endif
 
     /* make data=ordered the default */
     if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
         !reiserfs_data_writeback(s)) {
         sbi->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
     }
 
     if (reiserfs_data_log(s)) {
         reiserfs_info(s, "using journaled data mode\n");
     } else if (reiserfs_data_ordered(s)) {
         reiserfs_info(s, "using ordered data mode\n");
     } else {
         reiserfs_info(s, "using writeback data mode\n");
     }
     if (reiserfs_barrier_flush(s)) {
         printk("reiserfs: using flush barriers\n");
     }
 
     if (journal_init(s, jdev_name, old_format, commit_max_age)) {
         SWARN(silent, s, "sh-2022",
               "unable to initialize journal space");
         goto error_unlocked;
     } else {
         /*
          * once this is set, journal_release must be called
          * if we error out of the mount
          */
         jinit_done = 1;
     }
 
     if (reread_meta_blocks(s)) {
         SWARN(silent, s, "jmacd-9",
               "unable to reread meta blocks after journal init");
         goto error_unlocked;
     }
 
     if (replay_only(s))
         goto error_unlocked;
 
     s->s_xattr = reiserfs_xattr_handlers;
 
     if (bdev_read_only(s->s_bdev) && !sb_rdonly(s)) {
         SWARN(silent, s, "clm-7000",
               "Detected readonly device, marking FS readonly");
         s->s_flags |= SB_RDONLY;
     }
     args.objectid = REISERFS_ROOT_OBJECTID;
     args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
     root_inode =
         iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
              reiserfs_init_locked_inode, (void *)&args);
     if (!root_inode) {
         SWARN(silent, s, "jmacd-10", "get root inode failed");
         goto error_unlocked;
     }
 
     /*
      * This path assumed to be called with the BKL in the old times.
      * Now we have inherited the big reiserfs lock from it and many
      * reiserfs helpers called in the mount path and elsewhere require
      * this lock to be held even if it's not always necessary. Let's be
      * conservative and hold it early. The window can be reduced after
      * careful review of the code.
      */
     reiserfs_write_lock(s);
 
     if (root_inode->i_state & I_NEW) {
         reiserfs_read_locked_inode(root_inode, &args);
         unlock_new_inode(root_inode);
     }
 
     if (!S_ISDIR(root_inode->i_mode) || !inode_get_bytes(root_inode) ||
         !root_inode->i_size) {
         SWARN(silent, s, "", "corrupt root inode, run fsck");
         iput(root_inode);
         errval = -EUCLEAN;
         goto error;
     }
 
     s->s_root = d_make_root(root_inode);
     if (!s->s_root)
         goto error;
     /* define and initialize hash function */
     sbi->s_hash_function = hash_function(s);
     if (sbi->s_hash_function == NULL) {
         dput(s->s_root);
         s->s_root = NULL;
         goto error;
     }
 
     if (is_reiserfs_3_5(rs)
         || (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
         set_bit(REISERFS_3_5, &sbi->s_properties);
     else if (old_format)
         set_bit(REISERFS_OLD_FORMAT, &sbi->s_properties);
     else
         set_bit(REISERFS_3_6, &sbi->s_properties);
 
     if (!sb_rdonly(s)) {
 
         errval = journal_begin(&th, s, 1);
         if (errval) {
             dput(s->s_root);
             s->s_root = NULL;
             goto error;
         }
         reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
 
         set_sb_umount_state(rs, REISERFS_ERROR_FS);
         set_sb_fs_state(rs, 0);
 
         /*
          * Clear out s_bmap_nr if it would wrap. We can handle this
          * case, but older revisions can't. This will cause the
          * file system to fail mount on those older implementations,
          * avoiding corruption. -jeffm
          */
         if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
             sb_bmap_nr(rs) != 0) {
             reiserfs_warning(s, "super-2030", "This file system "
                     "claims to use %u bitmap blocks in "
                     "its super block, but requires %u. "
                     "Clearing to zero.", sb_bmap_nr(rs),
                     reiserfs_bmap_count(s));
 
             set_sb_bmap_nr(rs, 0);
         }
 
         if (old_format_only(s)) {
             /*
              * filesystem of format 3.5 either with standard
              * or non-standard journal
              */
             if (convert_reiserfs(s)) {
                 /* and -o conv is given */
                 if (!silent)
                     reiserfs_info(s,
                               "converting 3.5 filesystem to the 3.6 format");
 
                 if (is_reiserfs_3_5(rs))
                     /*
                      * put magic string of 3.6 format.
                      * 2.2 will not be able to
                      * mount this filesystem anymore
                      */
                     memcpy(rs->s_v1.s_magic,
                            reiserfs_3_6_magic_string,
                            sizeof
                            (reiserfs_3_6_magic_string));
 
                 set_sb_version(rs, REISERFS_VERSION_2);
                 reiserfs_convert_objectid_map_v1(s);
                 set_bit(REISERFS_3_6, &sbi->s_properties);
                 clear_bit(REISERFS_3_5, &sbi->s_properties);
             } else if (!silent) {
                 reiserfs_info(s, "using 3.5.x disk format\n");
             }
         } else
             set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
 
 
         journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
         errval = journal_end(&th);
         if (errval) {
             dput(s->s_root);
             s->s_root = NULL;
             goto error;
         }
 
         reiserfs_write_unlock(s);
         if ((errval = reiserfs_lookup_privroot(s)) ||
             (errval = reiserfs_xattr_init(s, s->s_flags))) {
             dput(s->s_root);
             s->s_root = NULL;
             goto error_unlocked;
         }
         reiserfs_write_lock(s);
 
         /*
          * look for files which were to be removed in previous session
          */
         finish_unfinished(s);
     } else {
         if (old_format_only(s) && !silent) {
             reiserfs_info(s, "using 3.5.x disk format\n");
         }
 
         reiserfs_write_unlock(s);
         if ((errval = reiserfs_lookup_privroot(s)) ||
             (errval = reiserfs_xattr_init(s, s->s_flags))) {
             dput(s->s_root);
             s->s_root = NULL;
             goto error_unlocked;
         }
         reiserfs_write_lock(s);
     }
     /*
      * mark hash in super block: it could be unset. overwrite should be ok
      */
     set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
 
     handle_attrs(s);
 
     reiserfs_proc_info_init(s);
 
     init_waitqueue_head(&(sbi->s_wait));
     spin_lock_init(&sbi->bitmap_lock);
 
     reiserfs_write_unlock(s);
 
     return (0);
 
 error:
     reiserfs_write_unlock(s);
 
 error_unlocked:
     /* kill the commit thread, free journal ram */
     if (jinit_done) {
         reiserfs_write_lock(s);
         journal_release_error(NULL, s);
         reiserfs_write_unlock(s);
     }
 
     if (sbi->commit_wq)
         destroy_workqueue(sbi->commit_wq);
 
     reiserfs_cancel_old_flush(s);
 
     reiserfs_free_bitmap_cache(s);
     if (SB_BUFFER_WITH_SB(s))
         brelse(SB_BUFFER_WITH_SB(s));
 #ifdef CONFIG_QUOTA
     {
         int j;
         for (j = 0; j < REISERFS_MAXQUOTAS; j++)
             kfree(qf_names[j]);
     }
 #endif
     kfree(sbi->s_jdev);
     kfree(sbi);
 
     s->s_fs_info = NULL;
     return errval;
 }
 
 static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
 {
     struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
 
     buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
     buf->f_bfree = sb_free_blocks(rs);
     buf->f_bavail = buf->f_bfree;
     buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
     buf->f_bsize = dentry->d_sb->s_blocksize;
     /* changed to accommodate gcc folks. */
     buf->f_type = REISERFS_SUPER_MAGIC;
     buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
     buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
                 sizeof(rs->s_uuid)/2);
 
     return 0;
 }
 
 #ifdef CONFIG_QUOTA
 static int reiserfs_write_dquot(struct dquot *dquot)
 {
     struct reiserfs_transaction_handle th;
     int ret, err;
     int depth;
 
     reiserfs_write_lock(dquot->dq_sb);
     ret =
         journal_begin(&th, dquot->dq_sb,
               REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
     if (ret)
         goto out;
     depth = reiserfs_write_unlock_nested(dquot->dq_sb);
     ret = dquot_commit(dquot);
     reiserfs_write_lock_nested(dquot->dq_sb, depth);
     err = journal_end(&th);
     if (!ret && err)
         ret = err;
 out:
     reiserfs_write_unlock(dquot->dq_sb);
     return ret;
 }
 
 static int reiserfs_acquire_dquot(struct dquot *dquot)
 {
     struct reiserfs_transaction_handle th;
     int ret, err;
     int depth;
 
     reiserfs_write_lock(dquot->dq_sb);
     ret =
         journal_begin(&th, dquot->dq_sb,
               REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
     if (ret)
         goto out;
     depth = reiserfs_write_unlock_nested(dquot->dq_sb);
     ret = dquot_acquire(dquot);
     reiserfs_write_lock_nested(dquot->dq_sb, depth);
     err = journal_end(&th);
     if (!ret && err)
         ret = err;
 out:
     reiserfs_write_unlock(dquot->dq_sb);
     return ret;
 }
 
 static int reiserfs_release_dquot(struct dquot *dquot)
 {
     struct reiserfs_transaction_handle th;
     int ret, err;
 
     reiserfs_write_lock(dquot->dq_sb);
     ret =
         journal_begin(&th, dquot->dq_sb,
               REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
     reiserfs_write_unlock(dquot->dq_sb);
     if (ret) {
         /* Release dquot anyway to avoid endless cycle in dqput() */
         dquot_release(dquot);
         goto out;
     }
     ret = dquot_release(dquot);
     reiserfs_write_lock(dquot->dq_sb);
     err = journal_end(&th);
     if (!ret && err)
         ret = err;
     reiserfs_write_unlock(dquot->dq_sb);
 out:
     return ret;
 }
 
 static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
 {
     /* Are we journaling quotas? */
     if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
         REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
         dquot_mark_dquot_dirty(dquot);
         return reiserfs_write_dquot(dquot);
     } else
         return dquot_mark_dquot_dirty(dquot);
 }
 
 static int reiserfs_write_info(struct super_block *sb, int type)
 {
     struct reiserfs_transaction_handle th;
     int ret, err;
     int depth;
 
     /* Data block + inode block */
     reiserfs_write_lock(sb);
     ret = journal_begin(&th, sb, 2);
     if (ret)
         goto out;
     depth = reiserfs_write_unlock_nested(sb);
     ret = dquot_commit_info(sb, type);
     reiserfs_write_lock_nested(sb, depth);
     err = journal_end(&th);
     if (!ret && err)
         ret = err;
 out:
     reiserfs_write_unlock(sb);
     return ret;
 }
 
 /*
  * Turn on quotas during mount time - we need to find the quota file and such...
  */
 static int reiserfs_quota_on_mount(struct super_block *sb, int type)
 {
     return dquot_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
                     REISERFS_SB(sb)->s_jquota_fmt, type);
 }
 
 /*
  * Standard function to be called on quota_on
  */
 static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
                  const struct path *path)
 {
     int err;
     struct inode *inode;
     struct reiserfs_transaction_handle th;
     int opt = type == USRQUOTA ? REISERFS_USRQUOTA : REISERFS_GRPQUOTA;
 
     reiserfs_write_lock(sb);
     if (!(REISERFS_SB(sb)->s_mount_opt & (1 << opt))) {
         err = -EINVAL;
         goto out;
     }
 
     /* Quotafile not on the same filesystem? */
     if (path->dentry->d_sb != sb) {
         err = -EXDEV;
         goto out;
     }
     inode = d_inode(path->dentry);
     /*
      * We must not pack tails for quota files on reiserfs for quota
      * IO to work
      */
     if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
         err = reiserfs_unpack(inode);
         if (err) {
             reiserfs_warning(sb, "super-6520",
                 "Unpacking tail of quota file failed"
                 " (%d). Cannot turn on quotas.", err);
             err = -EINVAL;
             goto out;
         }
         mark_inode_dirty(inode);
     }
     /* Journaling quota? */
     if (REISERFS_SB(sb)->s_qf_names[type]) {
         /* Quotafile not of fs root? */
         if (path->dentry->d_parent != sb->s_root)
             reiserfs_warning(sb, "super-6521",
                  "Quota file not on filesystem root. "
                  "Journalled quota will not work.");
     }
 
     /*
      * When we journal data on quota file, we have to flush journal to see
      * all updates to the file when we bypass pagecache...
      */
     if (reiserfs_file_data_log(inode)) {
         /* Just start temporary transaction and finish it */
         err = journal_begin(&th, sb, 1);
         if (err)
             goto out;
         err = journal_end_sync(&th);
         if (err)
             goto out;
     }
     reiserfs_write_unlock(sb);
     err = dquot_quota_on(sb, type, format_id, path);
     if (!err) {
         inode_lock(inode);
         REISERFS_I(inode)->i_attrs |= REISERFS_IMMUTABLE_FL |
                           REISERFS_NOATIME_FL;
         inode_set_flags(inode, S_IMMUTABLE | S_NOATIME,
                 S_IMMUTABLE | S_NOATIME);
         inode_unlock(inode);
         mark_inode_dirty(inode);
     }
     return err;
 out:
     reiserfs_write_unlock(sb);
     return err;
 }
 
 static int reiserfs_quota_off(struct super_block *sb, int type)
 {
     int err;
     struct inode *inode = sb_dqopt(sb)->files[type];
 
     if (!inode || !igrab(inode))
         goto out;
 
     err = dquot_quota_off(sb, type);
     if (err)
         goto out_put;
 
     inode_lock(inode);
     REISERFS_I(inode)->i_attrs &= ~(REISERFS_IMMUTABLE_FL |
                     REISERFS_NOATIME_FL);
     inode_set_flags(inode, 0, S_IMMUTABLE | S_NOATIME);
     inode_unlock(inode);
     mark_inode_dirty(inode);
 out_put:
     iput(inode);
     return err;
 out:
     return dquot_quota_off(sb, type);
 }
 
 /*
  * Read data from quotafile - avoid pagecache and such because we cannot afford
  * acquiring the locks... As quota files are never truncated and quota code
  * itself serializes the operations (and no one else should touch the files)
  * we don't have to be afraid of races
  */
 static ssize_t reiserfs_quota_read(struct super_block *sb, int type, char *data,
                    size_t len, loff_t off)
 {
     struct inode *inode = sb_dqopt(sb)->files[type];
     unsigned long blk = off >> sb->s_blocksize_bits;
     int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
     size_t toread;
     struct buffer_head tmp_bh, *bh;
     loff_t i_size = i_size_read(inode);
 
     if (off > i_size)
         return 0;
     if (off + len > i_size)
         len = i_size - off;
     toread = len;
     while (toread > 0) {
         tocopy =
             sb->s_blocksize - offset <
             toread ? sb->s_blocksize - offset : toread;
         tmp_bh.b_state = 0;
         /*
          * Quota files are without tails so we can safely
          * use this function
          */
         reiserfs_write_lock(sb);
         err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
         reiserfs_write_unlock(sb);
         if (err)
             return err;
         if (!buffer_mapped(&tmp_bh))    /* A hole? */
             memset(data, 0, tocopy);
         else {
             bh = sb_bread(sb, tmp_bh.b_blocknr);
             if (!bh)
                 return -EIO;
             memcpy(data, bh->b_data + offset, tocopy);
             brelse(bh);
         }
         offset = 0;
         toread -= tocopy;
         data += tocopy;
         blk++;
     }
     return len;
 }
 
 /*
  * Write to quotafile (we know the transaction is already started and has
  * enough credits)
  */
 static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
                     const char *data, size_t len, loff_t off)
 {
     struct inode *inode = sb_dqopt(sb)->files[type];
     unsigned long blk = off >> sb->s_blocksize_bits;
     int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
     int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
     size_t towrite = len;
     struct buffer_head tmp_bh, *bh;
 
     if (!current->journal_info) {
         printk(KERN_WARNING "reiserfs: Quota write (off=%llu, len=%llu) cancelled because transaction is not started.\n",
             (unsigned long long)off, (unsigned long long)len);
         return -EIO;
     }
     while (towrite > 0) {
         tocopy = sb->s_blocksize - offset < towrite ?
             sb->s_blocksize - offset : towrite;
         tmp_bh.b_state = 0;
         reiserfs_write_lock(sb);
         err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
         reiserfs_write_unlock(sb);
         if (err)
             goto out;
         if (offset || tocopy != sb->s_blocksize)
             bh = sb_bread(sb, tmp_bh.b_blocknr);
         else
             bh = sb_getblk(sb, tmp_bh.b_blocknr);
         if (!bh) {
             err = -EIO;
             goto out;
         }
         lock_buffer(bh);
         memcpy(bh->b_data + offset, data, tocopy);
         flush_dcache_page(bh->b_page);
         set_buffer_uptodate(bh);
         unlock_buffer(bh);
         reiserfs_write_lock(sb);
         reiserfs_prepare_for_journal(sb, bh, 1);
         journal_mark_dirty(current->journal_info, bh);
         if (!journal_quota)
             reiserfs_add_ordered_list(inode, bh);
         reiserfs_write_unlock(sb);
         brelse(bh);
         offset = 0;
         towrite -= tocopy;
         data += tocopy;
         blk++;
     }
 out:
     if (len == towrite)
         return err;
     if (inode->i_size < off + len - towrite)
         i_size_write(inode, off + len - towrite);
     inode->i_mtime = inode->i_ctime = current_time(inode);
     mark_inode_dirty(inode);
     return len - towrite;
 }
 
 #endif
 
 static struct dentry *get_super_block(struct file_system_type *fs_type,
                int flags, const char *dev_name,
                void *data)
 {
     return mount_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super);
 }
 
 static int __init init_reiserfs_fs(void)
 {
     int ret;
 
     ret = init_inodecache();
     if (ret)
         return ret;
 
     reiserfs_proc_info_global_init();
 
     ret = register_filesystem(&reiserfs_fs_type);
     if (ret)
         goto out;
 
     return 0;
 out:
     reiserfs_proc_info_global_done();
     destroy_inodecache();
 
     return ret;
 }
 
 static void __exit exit_reiserfs_fs(void)
 {
     reiserfs_proc_info_global_done();
     unregister_filesystem(&reiserfs_fs_type);
     destroy_inodecache();
 }
 
 struct file_system_type reiserfs_fs_type = {
     .owner = THIS_MODULE,
     .name = "reiserfs",
     .mount = get_super_block,
     .kill_sb = reiserfs_kill_sb,
     .fs_flags = FS_REQUIRES_DEV,
 };
 MODULE_ALIAS_FS("reiserfs");
 
 MODULE_DESCRIPTION("ReiserFS journaled filesystem");
 MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
 MODULE_LICENSE("GPL");
 
 module_init(init_reiserfs_fs);
 module_exit(exit_reiserfs_fs);