init android origin source code

1 files changed, 2369 insertions, 0 deletions

diff --git a/ANDROID_3.4.5/fs/reiserfs/super.c b/ANDROID_3.4.5/fs/reiserfs/super.c
new file mode 100644
index 00000000..8b7616ef
--- /dev/null
+++ b/ANDROID_3.4.5/fs/reiserfs/super.c
@@ -0,0 +1,2369 @@
+/*
+ * 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 <asm/uaccess.h>
+#include "reiserfs.h"
+#include "acl.h"
+#include "xattr.h"
+#include <linux/init.h>
+#include <linux/blkdev.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);
+void show_alloc_options(struct seq_file *seq, struct super_block *s);
+
+static int reiserfs_sync_fs(struct super_block *s, int wait)
+{
+	struct reiserfs_transaction_handle th;
+
+	reiserfs_write_lock(s);
+	if (!journal_begin(&th, s, 1))
+		if (!journal_end_sync(&th, s, 1))
+			reiserfs_flush_old_commits(s);
+	s->s_dirt = 0;	/* Even if it's not true.
+			 * We'll loop forever in sync_supers otherwise */
+	reiserfs_write_unlock(s);
+	return 0;
+}
+
+static void reiserfs_write_super(struct super_block *s)
+{
+	reiserfs_sync_fs(s, 1);
+}
+
+static int reiserfs_freeze(struct super_block *s)
+{
+	struct reiserfs_transaction_handle th;
+	reiserfs_write_lock(s);
+	if (!(s->s_flags & MS_RDONLY)) {
+		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, s, SB_BUFFER_WITH_SB(s));
+			reiserfs_block_writes(&th);
+			journal_end_sync(&th, s, 1);
+		}
+	}
+	s->s_dirt = 0;
+	reiserfs_write_unlock(s);
+	return 0;
+}
+
+static int reiserfs_unfreeze(struct super_block *s)
+{
+	reiserfs_allow_writes(s);
+	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, s, JOURNAL_PER_BALANCE_CNT);
+}
+
+#ifdef CONFIG_QUOTA
+static int reiserfs_quota_on_mount(struct super_block *, int);
+#endif
+
+/* look for uncompleted unlinks and truncates and complete them */
+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[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 & MS_ACTIVE) {
+		ms_active_set = 0;
+	} else {
+		ms_active_set = 1;
+		s->s_flags |= MS_ACTIVE;
+	}
+	/* Turn on quotas so that they are updated correctly */
+	for (i = 0; i < 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;
+			}
+			ret = reiserfs_quota_on_mount(s, i);
+			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) {
+		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 = B_N_PITEM_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 = B_I_PITEM(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 (!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;
+		}
+		dquot_initialize(inode);
+
+		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 %Ld ..",
+				      INODE_PKEY(inode), inode->i_size);
+			reiserfs_truncate_file(inode,
+					       0
+					       /*don't update modification time */
+					       );
+			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 */
+	for (i = 0; i < MAXQUOTAS; i++) {
+		if (sb_dqopt(s)->files[i] && quota_enabled[i])
+			dquot_quota_off(s, i);
+	}
+	if (ms_active_set)
+		/* Restore the flag back */
+		s->s_flags &= ~MS_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, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
+}
+
+static void reiserfs_kill_sb(struct super_block *s)
+{
+	if (REISERFS_SB(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);
+}
+
+static void reiserfs_put_super(struct super_block *s)
+{
+	struct reiserfs_transaction_handle th;
+	th.t_trans_id = 0;
+
+	dquot_disable(s, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
+
+	reiserfs_write_lock(s);
+
+	if (s->s_dirt)
+		reiserfs_write_super(s);
+
+	/* change file system state to current state if it was mounted with read-write permissions */
+	if (!(s->s_flags & MS_RDONLY)) {
+		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, s, 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_proc_info_done(s);
+
+	reiserfs_write_unlock(s);
+	mutex_destroy(&REISERFS_SB(s)->lock);
+	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 = (struct reiserfs_inode_info *)
+	    kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
+	if (!ei)
+		return NULL;
+	atomic_set(&ei->openers, 0);
+	mutex_init(&ei->tailpack);
+	return &ei->vfs_inode;
+}
+
+static void reiserfs_i_callback(struct rcu_head *head)
+{
+	struct inode *inode = container_of(head, struct inode, i_rcu);
+	kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
+}
+
+static void reiserfs_destroy_inode(struct inode *inode)
+{
+	call_rcu(&inode->i_rcu, reiserfs_i_callback);
+}
+
+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_inodecache(void)
+{
+	reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
+						  sizeof(struct
+							 reiserfs_inode_info),
+						  0, (SLAB_RECLAIM_ACCOUNT|
+							SLAB_MEM_SPREAD),
+						  init_once);
+	if (reiserfs_inode_cachep == NULL)
+		return -ENOMEM;
+	return 0;
+}
+
+static void destroy_inodecache(void)
+{
+	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;
+	int lock_depth;
+
+	if (inode->i_sb->s_flags & MS_RDONLY) {
+		reiserfs_warning(inode->i_sb, "clm-6006",
+				 "writing inode %lu on readonly FS",
+				 inode->i_ino);
+		return;
+	}
+	lock_depth = reiserfs_write_lock_once(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, inode->i_sb, 1);
+
+out:
+	reiserfs_write_unlock_once(inode->i_sb, lock_depth);
+}
+
+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_printf(seq, ",jdev=%s", 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_printf(seq, ",usrjquota=%s", 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_printf(seq, ",grpjquota=%s", 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);
+#endif
+
+static const struct super_operations reiserfs_sops = {
+	.alloc_inode = reiserfs_alloc_inode,
+	.destroy_inode = reiserfs_destroy_inode,
+	.write_inode = reiserfs_write_inode,
+	.dirty_inode = reiserfs_dirty_inode,
+	.evict_inode = reiserfs_evict_inode,
+	.put_super = reiserfs_put_super,
+	.write_super = reiserfs_write_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,
+#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, 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,
+};
+
+static const struct quotactl_ops reiserfs_qctl_operations = {
+	.quota_on = reiserfs_quota_on,
+	.quota_off = dquot_quota_off,
+	.quota_sync = dquot_quota_sync,
+	.get_info = dquot_get_dqinfo,
+	.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;
+	int setmask;		/* bitmask which is to set on mount_options bitmask when this
+				   value is found, 0 is no bits are to be changed. */
+	int clrmask;		/* 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 */
+} 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;
+	int arg_required;	/* 0 if argument is not required, not 0 otherwise */
+	const arg_desc_t *values;	/* list of values accepted by an option */
+	int setmask;		/* bitmask which is to set on mount_options bitmask when this
+				   value is found, 0 is no bits are to be changed. */
+	int clrmask;		/* 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 */
+} 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, char *options,	/* string given via mount's -o */
+				  unsigned long *mount_options,
+				  /* after the parsing phase, contains the
+				     collection of bitflags defining what
+				     mount options were selected. */
+				  unsigned long *blocks,	/* strtol-ed from NNN of resize=NNN */
+				  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 =
+				    s->s_bdev->bd_inode->i_size >> s->
+				    s_blocksize_bits;
+			} 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) {
+				if (*jdev_name) {	//Hm, already assigned?
+					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 (*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] =
+				    kmalloc(strlen(arg) + 1, GFP_KERNEL);
+				if (!qf_names[qtype]) {
+					reiserfs_warning(s, "reiserfs-2502",
+							 "not enough memory "
+							 "for storing "
+							 "quotafile name.");
+					return 0;
+				}
+				strcpy(qf_names[qtype], arg);
+				if (qtype == USRQUOTA)
+					*mount_options |= 1 << REISERFS_USRQUOTA;
+				else
+					*mount_options |= 1 << REISERFS_GRPQUOTA;
+			} else {
+				if (qf_names[qtype] !=
+				    REISERFS_SB(s)->s_qf_names[qtype])
+					kfree(qf_names[qtype]);
+				qf_names[qtype] = NULL;
+				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 < 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);
+	char *new_opts = kstrdup(arg, GFP_KERNEL);
+	int err;
+	char *qf_names[MAXQUOTAS];
+	unsigned int qfmt = 0;
+#ifdef CONFIG_QUOTA
+	int i;
+#endif
+
+	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 < MAXQUOTAS; i++)
+			if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
+				kfree(qf_names[i]);
+#endif
+		err = -EINVAL;
+		goto out_err;
+	}
+#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;
+	}
+
+	if (*mount_flags & MS_RDONLY) {
+		reiserfs_xattr_init(s, *mount_flags);
+		/* remount read-only */
+		if (s->s_flags & MS_RDONLY)
+			/* it is read-only already */
+			goto out_ok;
+
+		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;
+		}
+
+		err = journal_begin(&th, s, 10);
+		if (err)
+			goto out_err;
+
+		/* 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, s, SB_BUFFER_WITH_SB(s));
+	} else {
+		/* remount read-write */
+		if (!(s->s_flags & MS_RDONLY)) {
+			reiserfs_xattr_init(s, *mount_flags);
+			goto out_ok;	/* We are read-write already */
+		}
+
+		if (reiserfs_is_journal_aborted(journal)) {
+			err = journal->j_errno;
+			goto out_err;
+		}
+
+		handle_data_mode(s, mount_options);
+		handle_barrier_mode(s, mount_options);
+		REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
+		s->s_flags &= ~MS_RDONLY;	/* now it is safe to call journal_begin */
+		err = journal_begin(&th, s, 10);
+		if (err)
+			goto out_err;
+
+		/* 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 &= ~MS_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, s, 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, s, 10);
+	if (err)
+		goto out_err;
+	s->s_dirt = 0;
+
+	if (!(*mount_flags & MS_RDONLY)) {
+		dquot_resume(s, -1);
+		finish_unfinished(s);
+		reiserfs_xattr_init(s, *mount_flags);
+	}
+
+out_ok:
+	replace_mount_options(s, new_opts);
+	reiserfs_write_unlock(s);
+	return 0;
+
+out_err:
+	kfree(new_opts);
+	reiserfs_write_unlock(s);
+	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)",
+				 reiserfs_bdevname(s), 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)",
+				 reiserfs_bdevname(s), 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 %Lu, size %lu)",
+				 reiserfs_bdevname(s),
+				 (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;
+	}
+
+	SB_BUFFER_WITH_SB(s) = bh;
+	SB_DISK_SUPER_BLOCK(s) = rs;
+
+	if (is_reiserfs_jr(rs)) {
+		/* magic is of non-standard journal filesystem, look at s_version to
+		   find which format is in use */
+		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;
+#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(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
+// bith 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;
+	__u32 hash = DEFAULT_HASH;
+
+	inode = s->s_root->d_inode;
+
+	do {			// Some serious "goto"-hater was there ;)
+		u32 teahash, r5hash, yurahash;
+
+		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);
+		if (deh_offset(&(de.de_deh[de.de_entry_num])) == 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");
+			break;
+		}
+		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)
+		     &&
+		     (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num])))
+		      == r5hash)) || ((teahash == yurahash)
+				      && (yurahash ==
+					  GET_HASH_VALUE(deh_offset
+							 (&
+							  (de.
+							   de_deh[de.
+								  de_entry_num])))))
+		    || ((r5hash == yurahash)
+			&& (yurahash ==
+			    GET_HASH_VALUE(deh_offset
+					   (&(de.de_deh[de.de_entry_num])))))) {
+			reiserfs_warning(s, "reiserfs-2506", "Unable to "
+					 "automatically detect hash function. "
+					 "Please mount with -o "
+					 "hash={tea,rupasov,r5}");
+			hash = UNSET_HASH;
+			break;
+		}
+		if (GET_HASH_VALUE(deh_offset(&(de.de_deh[de.de_entry_num]))) ==
+		    yurahash)
+			hash = YURA_HASH;
+		else if (GET_HASH_VALUE
+			 (deh_offset(&(de.de_deh[de.de_entry_num]))) == teahash)
+			hash = TEA_HASH;
+		else if (GET_HASH_VALUE
+			 (deh_offset(&(de.de_deh[de.de_entry_num]))) == r5hash)
+			hash = R5_HASH;
+		else {
+			reiserfs_warning(s, "reiserfs-2506",
+					 "Unrecognised hash function");
+			hash = UNSET_HASH;
+		}
+	} while (0);
+
+	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 &&
+	    !(s->s_flags & MS_RDONLY) &&
+	    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[MAXQUOTAS] = {};
+	unsigned int qfmt = 0;
+
+	save_mount_options(s, data);
+
+	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 */
+	REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
+	REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_ERROR_RO);
+	REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_BARRIER_FLUSH);
+	/* no preallocation minimum, be smart in
+	   reiserfs_file_write instead */
+	REISERFS_SB(s)->s_alloc_options.preallocmin = 0;
+	/* Preallocate by 16 blocks (17-1) at once */
+	REISERFS_SB(s)->s_alloc_options.preallocsize = 17;
+	/* setup default block allocator options */
+	reiserfs_init_alloc_options(s);
+
+	mutex_init(&REISERFS_SB(s)->lock);
+	REISERFS_SB(s)->lock_depth = -1;
+
+	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]) {
+		REISERFS_SB(s)->s_jdev = kstrdup(jdev_name, GFP_KERNEL);
+		if (!REISERFS_SB(s)->s_jdev) {
+			SWARN(silent, s, "", "Cannot allocate memory for "
+				"journal device name");
+			goto error;
+		}
+	}
+#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",
+		      reiserfs_bdevname(s));
+		goto error_unlocked;
+	}
+
+	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 (s->s_bdev && s->s_bdev->bd_inode
+	    && i_size_read(s->s_bdev->bd_inode) <
+	    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)) {
+		REISERFS_SB(s)->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");
+	}
+
+	// set_device_ro(s->s_dev, 1) ;
+	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 {
+		jinit_done = 1;	/* once this is set, journal_release must be called
+				 ** if we error out of the mount
+				 */
+	}
+
+	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;
+
+	if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
+		SWARN(silent, s, "clm-7000",
+		      "Detected readonly device, marking FS readonly");
+		s->s_flags |= MS_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);
+	}
+
+	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 (!(s->s_flags & MS_RDONLY)) {
+
+		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, s, SB_BUFFER_WITH_SB(s));
+		errval = journal_end(&th, s, 1);
+		if (errval) {
+			dput(s->s_root);
+			s->s_root = NULL;
+			goto error;
+		}
+
+		if ((errval = reiserfs_lookup_privroot(s)) ||
+		    (errval = reiserfs_xattr_init(s, s->s_flags))) {
+			dput(s->s_root);
+			s->s_root = NULL;
+			goto error;
+		}
+
+		/* 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");
+		}
+
+		if ((errval = reiserfs_lookup_privroot(s)) ||
+		    (errval = reiserfs_xattr_init(s, s->s_flags))) {
+			dput(s->s_root);
+			s->s_root = NULL;
+			goto error;
+		}
+	}
+	// 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);
+	}
+
+	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 < MAXQUOTAS; j++)
+			kfree(qf_names[j]);
+	}
+#endif
+	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;
+
+	reiserfs_write_lock(dquot->dq_sb);
+	ret =
+	    journal_begin(&th, dquot->dq_sb,
+			  REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
+	if (ret)
+		goto out;
+	ret = dquot_commit(dquot);
+	err =
+	    journal_end(&th, dquot->dq_sb,
+			REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
+	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;
+
+	reiserfs_write_lock(dquot->dq_sb);
+	ret =
+	    journal_begin(&th, dquot->dq_sb,
+			  REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
+	if (ret)
+		goto out;
+	ret = dquot_acquire(dquot);
+	err =
+	    journal_end(&th, dquot->dq_sb,
+			REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
+	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));
+	if (ret) {
+		/* Release dquot anyway to avoid endless cycle in dqput() */
+		dquot_release(dquot);
+		goto out;
+	}
+	ret = dquot_release(dquot);
+	err =
+	    journal_end(&th, dquot->dq_sb,
+			REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
+	if (!ret && err)
+		ret = err;
+      out:
+	reiserfs_write_unlock(dquot->dq_sb);
+	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;
+
+	/* Data block + inode block */
+	reiserfs_write_lock(sb);
+	ret = journal_begin(&th, sb, 2);
+	if (ret)
+		goto out;
+	ret = dquot_commit_info(sb, type);
+	err = journal_end(&th, sb, 2);
+	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,
+			     struct path *path)
+{
+	int err;
+	struct inode *inode;
+	struct reiserfs_transaction_handle th;
+	int opt = type == USRQUOTA ? REISERFS_USRQUOTA : REISERFS_GRPQUOTA;
+
+	if (!(REISERFS_SB(sb)->s_mount_opt & (1 << opt)))
+		return -EINVAL;
+
+	/* Quotafile not on the same filesystem? */
+	if (path->dentry->d_sb != sb) {
+		err = -EXDEV;
+		goto out;
+	}
+	inode = path->dentry->d_inode;
+	/* 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, NULL);
+		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, sb, 1);
+		if (err)
+			goto out;
+	}
+	err = dquot_quota_on(sb, type, format_id, path);
+out:
+	return err;
+}
+
+/* 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=%Lu, len=%Lu)"
+			" cancelled because transaction is not started.\n",
+			(unsigned long long)off, (unsigned long long)len);
+		return -EIO;
+	}
+	mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
+	while (towrite > 0) {
+		tocopy = sb->s_blocksize - offset < towrite ?
+		    sb->s_blocksize - offset : towrite;
+		tmp_bh.b_state = 0;
+		err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
+		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_prepare_for_journal(sb, bh, 1);
+		journal_mark_dirty(current->journal_info, sb, bh);
+		if (!journal_quota)
+			reiserfs_add_ordered_list(inode, bh);
+		brelse(bh);
+		offset = 0;
+		towrite -= tocopy;
+		data += tocopy;
+		blk++;
+	}
+out:
+	if (len == towrite) {
+		mutex_unlock(&inode->i_mutex);
+		return err;
+	}
+	if (inode->i_size < off + len - towrite)
+		i_size_write(inode, off + len - towrite);
+	inode->i_version++;
+	inode->i_mtime = inode->i_ctime = CURRENT_TIME;
+	mark_inode_dirty(inode);
+	mutex_unlock(&inode->i_mutex);
+	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;
+
+	if ((ret = init_inodecache())) {
+		return ret;
+	}
+
+	reiserfs_proc_info_global_init();
+
+	ret = register_filesystem(&reiserfs_fs_type);
+
+	if (ret == 0) {
+		return 0;
+	}
+
+	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_DESCRIPTION("ReiserFS journaled filesystem");
+MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
+MODULE_LICENSE("GPL");
+
+module_init(init_reiserfs_fs);
+module_exit(exit_reiserfs_fs);