move private bits of reiserfs_fs.h to fs/reiserfs/reiserfs.h

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 2327 insertions, 0 deletions

diff --git a/fs/reiserfs/reiserfs.h b/fs/reiserfs/reiserfs.h
new file mode 100644
index 000000000000..b3865c84f54c
--- /dev/null
+++ b/fs/reiserfs/reiserfs.h
@@ -0,0 +1,2327 @@
+/*
+ * Copyright 1996, 1997, 1998 Hans Reiser, see reiserfs/README for licensing and copyright details
+ */
+
+#include <linux/reiserfs_fs.h>
+
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/sched.h>
+#include <linux/workqueue.h>
+#include <asm/unaligned.h>
+#include <linux/bitops.h>
+#include <linux/proc_fs.h>
+#include <linux/buffer_head.h>
+#include <linux/reiserfs_fs_i.h>
+#include <linux/reiserfs_fs_sb.h>
+
+/* the 32 bit compat definitions with int argument */
+#define REISERFS_IOC32_UNPACK		_IOW(0xCD, 1, int)
+#define REISERFS_IOC32_GETFLAGS		FS_IOC32_GETFLAGS
+#define REISERFS_IOC32_SETFLAGS		FS_IOC32_SETFLAGS
+#define REISERFS_IOC32_GETVERSION	FS_IOC32_GETVERSION
+#define REISERFS_IOC32_SETVERSION	FS_IOC32_SETVERSION
+
+/*
+ * Locking primitives. The write lock is a per superblock
+ * special mutex that has properties close to the Big Kernel Lock
+ * which was used in the previous locking scheme.
+ */
+void reiserfs_write_lock(struct super_block *s);
+void reiserfs_write_unlock(struct super_block *s);
+int reiserfs_write_lock_once(struct super_block *s);
+void reiserfs_write_unlock_once(struct super_block *s, int lock_depth);
+
+#ifdef CONFIG_REISERFS_CHECK
+void reiserfs_lock_check_recursive(struct super_block *s);
+#else
+static inline void reiserfs_lock_check_recursive(struct super_block *s) { }
+#endif
+
+/*
+ * Several mutexes depend on the write lock.
+ * However sometimes we want to relax the write lock while we hold
+ * these mutexes, according to the release/reacquire on schedule()
+ * properties of the Bkl that were used.
+ * Reiserfs performances and locking were based on this scheme.
+ * Now that the write lock is a mutex and not the bkl anymore, doing so
+ * may result in a deadlock:
+ *
+ * A acquire write_lock
+ * A acquire j_commit_mutex
+ * A release write_lock and wait for something
+ * B acquire write_lock
+ * B can't acquire j_commit_mutex and sleep
+ * A can't acquire write lock anymore
+ * deadlock
+ *
+ * What we do here is avoiding such deadlock by playing the same game
+ * than the Bkl: if we can't acquire a mutex that depends on the write lock,
+ * we release the write lock, wait a bit and then retry.
+ *
+ * The mutexes concerned by this hack are:
+ * - The commit mutex of a journal list
+ * - The flush mutex
+ * - The journal lock
+ * - The inode mutex
+ */
+static inline void reiserfs_mutex_lock_safe(struct mutex *m,
+			       struct super_block *s)
+{
+	reiserfs_lock_check_recursive(s);
+	reiserfs_write_unlock(s);
+	mutex_lock(m);
+	reiserfs_write_lock(s);
+}
+
+static inline void
+reiserfs_mutex_lock_nested_safe(struct mutex *m, unsigned int subclass,
+			       struct super_block *s)
+{
+	reiserfs_lock_check_recursive(s);
+	reiserfs_write_unlock(s);
+	mutex_lock_nested(m, subclass);
+	reiserfs_write_lock(s);
+}
+
+static inline void
+reiserfs_down_read_safe(struct rw_semaphore *sem, struct super_block *s)
+{
+	reiserfs_lock_check_recursive(s);
+	reiserfs_write_unlock(s);
+	down_read(sem);
+	reiserfs_write_lock(s);
+}
+
+/*
+ * When we schedule, we usually want to also release the write lock,
+ * according to the previous bkl based locking scheme of reiserfs.
+ */
+static inline void reiserfs_cond_resched(struct super_block *s)
+{
+	if (need_resched()) {
+		reiserfs_write_unlock(s);
+		schedule();
+		reiserfs_write_lock(s);
+	}
+}
+
+struct fid;
+
+/* in reading the #defines, it may help to understand that they employ
+   the following abbreviations:
+
+   B = Buffer
+   I = Item header
+   H = Height within the tree (should be changed to LEV)
+   N = Number of the item in the node
+   STAT = stat data
+   DEH = Directory Entry Header
+   EC = Entry Count
+   E = Entry number
+   UL = Unsigned Long
+   BLKH = BLocK Header
+   UNFM = UNForMatted node
+   DC = Disk Child
+   P = Path
+
+   These #defines are named by concatenating these abbreviations,
+   where first comes the arguments, and last comes the return value,
+   of the macro.
+
+*/
+
+#define USE_INODE_GENERATION_COUNTER
+
+#define REISERFS_PREALLOCATE
+#define DISPLACE_NEW_PACKING_LOCALITIES
+#define PREALLOCATION_SIZE 9
+
+/* n must be power of 2 */
+#define _ROUND_UP(x,n) (((x)+(n)-1u) & ~((n)-1u))
+
+// to be ok for alpha and others we have to align structures to 8 byte
+// boundary.
+// FIXME: do not change 4 by anything else: there is code which relies on that
+#define ROUND_UP(x) _ROUND_UP(x,8LL)
+
+/* debug levels.  Right now, CONFIG_REISERFS_CHECK means print all debug
+** messages.
+*/
+#define REISERFS_DEBUG_CODE 5	/* extra messages to help find/debug errors */
+
+void __reiserfs_warning(struct super_block *s, const char *id,
+			 const char *func, const char *fmt, ...);
+#define reiserfs_warning(s, id, fmt, args...) \
+	 __reiserfs_warning(s, id, __func__, fmt, ##args)
+/* assertions handling */
+
+/** always check a condition and panic if it's false. */
+#define __RASSERT(cond, scond, format, args...)			\
+do {									\
+	if (!(cond))							\
+		reiserfs_panic(NULL, "assertion failure", "(" #cond ") at " \
+			       __FILE__ ":%i:%s: " format "\n",		\
+			       in_interrupt() ? -1 : task_pid_nr(current), \
+			       __LINE__, __func__ , ##args);		\
+} while (0)
+
+#define RASSERT(cond, format, args...) __RASSERT(cond, #cond, format, ##args)
+
+#if defined( CONFIG_REISERFS_CHECK )
+#define RFALSE(cond, format, args...) __RASSERT(!(cond), "!(" #cond ")", format, ##args)
+#else
+#define RFALSE( cond, format, args... ) do {;} while( 0 )
+#endif
+
+#define CONSTF __attribute_const__
+/*
+ * Disk Data Structures
+ */
+
+/***************************************************************************/
+/*                             SUPER BLOCK                                 */
+/***************************************************************************/
+
+/*
+ * Structure of super block on disk, a version of which in RAM is often accessed as REISERFS_SB(s)->s_rs
+ * the version in RAM is part of a larger structure containing fields never written to disk.
+ */
+#define UNSET_HASH 0		// read_super will guess about, what hash names
+		     // in directories were sorted with
+#define TEA_HASH  1
+#define YURA_HASH 2
+#define R5_HASH   3
+#define DEFAULT_HASH R5_HASH
+
+struct journal_params {
+	__le32 jp_journal_1st_block;	/* where does journal start from on its
+					 * device */
+	__le32 jp_journal_dev;	/* journal device st_rdev */
+	__le32 jp_journal_size;	/* size of the journal */
+	__le32 jp_journal_trans_max;	/* max number of blocks in a transaction. */
+	__le32 jp_journal_magic;	/* random value made on fs creation (this
+					 * was sb_journal_block_count) */
+	__le32 jp_journal_max_batch;	/* max number of blocks to batch into a
+					 * trans */
+	__le32 jp_journal_max_commit_age;	/* in seconds, how old can an async
+						 * commit be */
+	__le32 jp_journal_max_trans_age;	/* in seconds, how old can a transaction
+						 * be */
+};
+
+/* this is the super from 3.5.X, where X >= 10 */
+struct reiserfs_super_block_v1 {
+	__le32 s_block_count;	/* blocks count         */
+	__le32 s_free_blocks;	/* free blocks count    */
+	__le32 s_root_block;	/* root block number    */
+	struct journal_params s_journal;
+	__le16 s_blocksize;	/* block size */
+	__le16 s_oid_maxsize;	/* max size of object id array, see
+				 * get_objectid() commentary  */
+	__le16 s_oid_cursize;	/* current size of object id array */
+	__le16 s_umount_state;	/* this is set to 1 when filesystem was
+				 * umounted, to 2 - when not */
+	char s_magic[10];	/* reiserfs magic string indicates that
+				 * file system is reiserfs:
+				 * "ReIsErFs" or "ReIsEr2Fs" or "ReIsEr3Fs" */
+	__le16 s_fs_state;	/* it is set to used by fsck to mark which
+				 * phase of rebuilding is done */
+	__le32 s_hash_function_code;	/* indicate, what hash function is being use
+					 * to sort names in a directory*/
+	__le16 s_tree_height;	/* height of disk tree */
+	__le16 s_bmap_nr;	/* amount of bitmap blocks needed to address
+				 * each block of file system */
+	__le16 s_version;	/* this field is only reliable on filesystem
+				 * with non-standard journal */
+	__le16 s_reserved_for_journal;	/* size in blocks of journal area on main
+					 * device, we need to keep after
+					 * making fs with non-standard journal */
+} __attribute__ ((__packed__));
+
+#define SB_SIZE_V1 (sizeof(struct reiserfs_super_block_v1))
+
+/* this is the on disk super block */
+struct reiserfs_super_block {
+	struct reiserfs_super_block_v1 s_v1;
+	__le32 s_inode_generation;
+	__le32 s_flags;		/* Right now used only by inode-attributes, if enabled */
+	unsigned char s_uuid[16];	/* filesystem unique identifier */
+	unsigned char s_label[16];	/* filesystem volume label */
+	__le16 s_mnt_count;		/* Count of mounts since last fsck */
+	__le16 s_max_mnt_count;		/* Maximum mounts before check */
+	__le32 s_lastcheck;		/* Timestamp of last fsck */
+	__le32 s_check_interval;	/* Interval between checks */
+	char s_unused[76];	/* zero filled by mkreiserfs and
+				 * reiserfs_convert_objectid_map_v1()
+				 * so any additions must be updated
+				 * there as well. */
+} __attribute__ ((__packed__));
+
+#define SB_SIZE (sizeof(struct reiserfs_super_block))
+
+#define REISERFS_VERSION_1 0
+#define REISERFS_VERSION_2 2
+
+// on-disk super block fields converted to cpu form
+#define SB_DISK_SUPER_BLOCK(s) (REISERFS_SB(s)->s_rs)
+#define SB_V1_DISK_SUPER_BLOCK(s) (&(SB_DISK_SUPER_BLOCK(s)->s_v1))
+#define SB_BLOCKSIZE(s) \
+        le32_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_blocksize))
+#define SB_BLOCK_COUNT(s) \
+        le32_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_block_count))
+#define SB_FREE_BLOCKS(s) \
+        le32_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_free_blocks))
+#define SB_REISERFS_MAGIC(s) \
+        (SB_V1_DISK_SUPER_BLOCK(s)->s_magic)
+#define SB_ROOT_BLOCK(s) \
+        le32_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_root_block))
+#define SB_TREE_HEIGHT(s) \
+        le16_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_tree_height))
+#define SB_REISERFS_STATE(s) \
+        le16_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_umount_state))
+#define SB_VERSION(s) le16_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_version))
+#define SB_BMAP_NR(s) le16_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_bmap_nr))
+
+#define PUT_SB_BLOCK_COUNT(s, val) \
+   do { SB_V1_DISK_SUPER_BLOCK(s)->s_block_count = cpu_to_le32(val); } while (0)
+#define PUT_SB_FREE_BLOCKS(s, val) \
+   do { SB_V1_DISK_SUPER_BLOCK(s)->s_free_blocks = cpu_to_le32(val); } while (0)
+#define PUT_SB_ROOT_BLOCK(s, val) \
+   do { SB_V1_DISK_SUPER_BLOCK(s)->s_root_block = cpu_to_le32(val); } while (0)
+#define PUT_SB_TREE_HEIGHT(s, val) \
+   do { SB_V1_DISK_SUPER_BLOCK(s)->s_tree_height = cpu_to_le16(val); } while (0)
+#define PUT_SB_REISERFS_STATE(s, val) \
+   do { SB_V1_DISK_SUPER_BLOCK(s)->s_umount_state = cpu_to_le16(val); } while (0)
+#define PUT_SB_VERSION(s, val) \
+   do { SB_V1_DISK_SUPER_BLOCK(s)->s_version = cpu_to_le16(val); } while (0)
+#define PUT_SB_BMAP_NR(s, val) \
+   do { SB_V1_DISK_SUPER_BLOCK(s)->s_bmap_nr = cpu_to_le16 (val); } while (0)
+
+#define SB_ONDISK_JP(s) (&SB_V1_DISK_SUPER_BLOCK(s)->s_journal)
+#define SB_ONDISK_JOURNAL_SIZE(s) \
+         le32_to_cpu ((SB_ONDISK_JP(s)->jp_journal_size))
+#define SB_ONDISK_JOURNAL_1st_BLOCK(s) \
+         le32_to_cpu ((SB_ONDISK_JP(s)->jp_journal_1st_block))
+#define SB_ONDISK_JOURNAL_DEVICE(s) \
+         le32_to_cpu ((SB_ONDISK_JP(s)->jp_journal_dev))
+#define SB_ONDISK_RESERVED_FOR_JOURNAL(s) \
+         le16_to_cpu ((SB_V1_DISK_SUPER_BLOCK(s)->s_reserved_for_journal))
+
+#define is_block_in_log_or_reserved_area(s, block) \
+         block >= SB_JOURNAL_1st_RESERVED_BLOCK(s) \
+         && block < SB_JOURNAL_1st_RESERVED_BLOCK(s) +  \
+         ((!is_reiserfs_jr(SB_DISK_SUPER_BLOCK(s)) ? \
+         SB_ONDISK_JOURNAL_SIZE(s) + 1 : SB_ONDISK_RESERVED_FOR_JOURNAL(s)))
+
+int is_reiserfs_3_5(struct reiserfs_super_block *rs);
+int is_reiserfs_3_6(struct reiserfs_super_block *rs);
+int is_reiserfs_jr(struct reiserfs_super_block *rs);
+
+/* ReiserFS leaves the first 64k unused, so that partition labels have
+   enough space.  If someone wants to write a fancy bootloader that
+   needs more than 64k, let us know, and this will be increased in size.
+   This number must be larger than than the largest block size on any
+   platform, or code will break.  -Hans */
+#define REISERFS_DISK_OFFSET_IN_BYTES (64 * 1024)
+#define REISERFS_FIRST_BLOCK unused_define
+#define REISERFS_JOURNAL_OFFSET_IN_BYTES REISERFS_DISK_OFFSET_IN_BYTES
+
+/* the spot for the super in versions 3.5 - 3.5.10 (inclusive) */
+#define REISERFS_OLD_DISK_OFFSET_IN_BYTES (8 * 1024)
+
+/* reiserfs internal error code (used by search_by_key and fix_nodes)) */
+#define CARRY_ON      0
+#define REPEAT_SEARCH -1
+#define IO_ERROR      -2
+#define NO_DISK_SPACE -3
+#define NO_BALANCING_NEEDED  (-4)
+#define NO_MORE_UNUSED_CONTIGUOUS_BLOCKS (-5)
+#define QUOTA_EXCEEDED -6
+
+typedef __u32 b_blocknr_t;
+typedef __le32 unp_t;
+
+struct unfm_nodeinfo {
+	unp_t unfm_nodenum;
+	unsigned short unfm_freespace;
+};
+
+/* there are two formats of keys: 3.5 and 3.6
+ */
+#define KEY_FORMAT_3_5 0
+#define KEY_FORMAT_3_6 1
+
+/* there are two stat datas */
+#define STAT_DATA_V1 0
+#define STAT_DATA_V2 1
+
+static inline struct reiserfs_inode_info *REISERFS_I(const struct inode *inode)
+{
+	return container_of(inode, struct reiserfs_inode_info, vfs_inode);
+}
+
+static inline struct reiserfs_sb_info *REISERFS_SB(const struct super_block *sb)
+{
+	return sb->s_fs_info;
+}
+
+/* Don't trust REISERFS_SB(sb)->s_bmap_nr, it's a u16
+ * which overflows on large file systems. */
+static inline __u32 reiserfs_bmap_count(struct super_block *sb)
+{
+	return (SB_BLOCK_COUNT(sb) - 1) / (sb->s_blocksize * 8) + 1;
+}
+
+static inline int bmap_would_wrap(unsigned bmap_nr)
+{
+	return bmap_nr > ((1LL << 16) - 1);
+}
+
+/** this says about version of key of all items (but stat data) the
+    object consists of */
+#define get_inode_item_key_version( inode )                                    \
+    ((REISERFS_I(inode)->i_flags & i_item_key_version_mask) ? KEY_FORMAT_3_6 : KEY_FORMAT_3_5)
+
+#define set_inode_item_key_version( inode, version )                           \
+         ({ if((version)==KEY_FORMAT_3_6)                                      \
+                REISERFS_I(inode)->i_flags |= i_item_key_version_mask;      \
+            else                                                               \
+                REISERFS_I(inode)->i_flags &= ~i_item_key_version_mask; })
+
+#define get_inode_sd_version(inode)                                            \
+    ((REISERFS_I(inode)->i_flags & i_stat_data_version_mask) ? STAT_DATA_V2 : STAT_DATA_V1)
+
+#define set_inode_sd_version(inode, version)                                   \
+         ({ if((version)==STAT_DATA_V2)                                        \
+                REISERFS_I(inode)->i_flags |= i_stat_data_version_mask;     \
+            else                                                               \
+                REISERFS_I(inode)->i_flags &= ~i_stat_data_version_mask; })
+
+/* This is an aggressive tail suppression policy, I am hoping it
+   improves our benchmarks. The principle behind it is that percentage
+   space saving is what matters, not absolute space saving.  This is
+   non-intuitive, but it helps to understand it if you consider that the
+   cost to access 4 blocks is not much more than the cost to access 1
+   block, if you have to do a seek and rotate.  A tail risks a
+   non-linear disk access that is significant as a percentage of total
+   time cost for a 4 block file and saves an amount of space that is
+   less significant as a percentage of space, or so goes the hypothesis.
+   -Hans */
+#define STORE_TAIL_IN_UNFM_S1(n_file_size,n_tail_size,n_block_size) \
+(\
+  (!(n_tail_size)) || \
+  (((n_tail_size) > MAX_DIRECT_ITEM_LEN(n_block_size)) || \
+   ( (n_file_size) >= (n_block_size) * 4 ) || \
+   ( ( (n_file_size) >= (n_block_size) * 3 ) && \
+     ( (n_tail_size) >=   (MAX_DIRECT_ITEM_LEN(n_block_size))/4) ) || \
+   ( ( (n_file_size) >= (n_block_size) * 2 ) && \
+     ( (n_tail_size) >=   (MAX_DIRECT_ITEM_LEN(n_block_size))/2) ) || \
+   ( ( (n_file_size) >= (n_block_size) ) && \
+     ( (n_tail_size) >=   (MAX_DIRECT_ITEM_LEN(n_block_size) * 3)/4) ) ) \
+)
+
+/* Another strategy for tails, this one means only create a tail if all the
+   file would fit into one DIRECT item.
+   Primary intention for this one is to increase performance by decreasing
+   seeking.
+*/
+#define STORE_TAIL_IN_UNFM_S2(n_file_size,n_tail_size,n_block_size) \
+(\
+  (!(n_tail_size)) || \
+  (((n_file_size) > MAX_DIRECT_ITEM_LEN(n_block_size)) ) \
+)
+
+/*
+ * values for s_umount_state field
+ */
+#define REISERFS_VALID_FS    1
+#define REISERFS_ERROR_FS    2
+
+//
+// there are 5 item types currently
+//
+#define TYPE_STAT_DATA 0
+#define TYPE_INDIRECT 1
+#define TYPE_DIRECT 2
+#define TYPE_DIRENTRY 3
+#define TYPE_MAXTYPE 3
+#define TYPE_ANY 15		// FIXME: comment is required
+
+/***************************************************************************/
+/*                       KEY & ITEM HEAD                                   */
+/***************************************************************************/
+
+//
+// directories use this key as well as old files
+//
+struct offset_v1 {
+	__le32 k_offset;
+	__le32 k_uniqueness;
+} __attribute__ ((__packed__));
+
+struct offset_v2 {
+	__le64 v;
+} __attribute__ ((__packed__));
+
+static inline __u16 offset_v2_k_type(const struct offset_v2 *v2)
+{
+	__u8 type = le64_to_cpu(v2->v) >> 60;
+	return (type <= TYPE_MAXTYPE) ? type : TYPE_ANY;
+}
+
+static inline void set_offset_v2_k_type(struct offset_v2 *v2, int type)
+{
+	v2->v =
+	    (v2->v & cpu_to_le64(~0ULL >> 4)) | cpu_to_le64((__u64) type << 60);
+}
+
+static inline loff_t offset_v2_k_offset(const struct offset_v2 *v2)
+{
+	return le64_to_cpu(v2->v) & (~0ULL >> 4);
+}
+
+static inline void set_offset_v2_k_offset(struct offset_v2 *v2, loff_t offset)
+{
+	offset &= (~0ULL >> 4);
+	v2->v = (v2->v & cpu_to_le64(15ULL << 60)) | cpu_to_le64(offset);
+}
+
+/* Key of an item determines its location in the S+tree, and
+   is composed of 4 components */
+struct reiserfs_key {
+	__le32 k_dir_id;	/* packing locality: by default parent
+				   directory object id */
+	__le32 k_objectid;	/* object identifier */
+	union {
+		struct offset_v1 k_offset_v1;
+		struct offset_v2 k_offset_v2;
+	} __attribute__ ((__packed__)) u;
+} __attribute__ ((__packed__));
+
+struct in_core_key {
+	__u32 k_dir_id;		/* packing locality: by default parent
+				   directory object id */
+	__u32 k_objectid;	/* object identifier */
+	__u64 k_offset;
+	__u8 k_type;
+};
+
+struct cpu_key {
+	struct in_core_key on_disk_key;
+	int version;
+	int key_length;		/* 3 in all cases but direct2indirect and
+				   indirect2direct conversion */
+};
+
+/* Our function for comparing keys can compare keys of different
+   lengths.  It takes as a parameter the length of the keys it is to
+   compare.  These defines are used in determining what is to be passed
+   to it as that parameter. */
+#define REISERFS_FULL_KEY_LEN     4
+#define REISERFS_SHORT_KEY_LEN    2
+
+/* The result of the key compare */
+#define FIRST_GREATER 1
+#define SECOND_GREATER -1
+#define KEYS_IDENTICAL 0
+#define KEY_FOUND 1
+#define KEY_NOT_FOUND 0
+
+#define KEY_SIZE (sizeof(struct reiserfs_key))
+#define SHORT_KEY_SIZE (sizeof (__u32) + sizeof (__u32))
+
+/* return values for search_by_key and clones */
+#define ITEM_FOUND 1
+#define ITEM_NOT_FOUND 0
+#define ENTRY_FOUND 1
+#define ENTRY_NOT_FOUND 0
+#define DIRECTORY_NOT_FOUND -1
+#define REGULAR_FILE_FOUND -2
+#define DIRECTORY_FOUND -3
+#define BYTE_FOUND 1
+#define BYTE_NOT_FOUND 0
+#define FILE_NOT_FOUND -1
+
+#define POSITION_FOUND 1
+#define POSITION_NOT_FOUND 0
+
+// return values for reiserfs_find_entry and search_by_entry_key
+#define NAME_FOUND 1
+#define NAME_NOT_FOUND 0
+#define GOTO_PREVIOUS_ITEM 2
+#define NAME_FOUND_INVISIBLE 3
+
+/*  Everything in the filesystem is stored as a set of items.  The
+    item head contains the key of the item, its free space (for
+    indirect items) and specifies the location of the item itself
+    within the block.  */
+
+struct item_head {
+	/* Everything in the tree is found by searching for it based on
+	 * its key.*/
+	struct reiserfs_key ih_key;
+	union {
+		/* The free space in the last unformatted node of an
+		   indirect item if this is an indirect item.  This
+		   equals 0xFFFF iff this is a direct item or stat data
+		   item. Note that the key, not this field, is used to
+		   determine the item type, and thus which field this
+		   union contains. */
+		__le16 ih_free_space_reserved;
+		/* Iff this is a directory item, this field equals the
+		   number of directory entries in the directory item. */
+		__le16 ih_entry_count;
+	} __attribute__ ((__packed__)) u;
+	__le16 ih_item_len;	/* total size of the item body */
+	__le16 ih_item_location;	/* an offset to the item body
+					 * within the block */
+	__le16 ih_version;	/* 0 for all old items, 2 for new
+				   ones. Highest bit is set by fsck
+				   temporary, cleaned after all
+				   done */
+} __attribute__ ((__packed__));
+/* size of item header     */
+#define IH_SIZE (sizeof(struct item_head))
+
+#define ih_free_space(ih)            le16_to_cpu((ih)->u.ih_free_space_reserved)
+#define ih_version(ih)               le16_to_cpu((ih)->ih_version)
+#define ih_entry_count(ih)           le16_to_cpu((ih)->u.ih_entry_count)
+#define ih_location(ih)              le16_to_cpu((ih)->ih_item_location)
+#define ih_item_len(ih)              le16_to_cpu((ih)->ih_item_len)
+
+#define put_ih_free_space(ih, val)   do { (ih)->u.ih_free_space_reserved = cpu_to_le16(val); } while(0)
+#define put_ih_version(ih, val)      do { (ih)->ih_version = cpu_to_le16(val); } while (0)
+#define put_ih_entry_count(ih, val)  do { (ih)->u.ih_entry_count = cpu_to_le16(val); } while (0)
+#define put_ih_location(ih, val)     do { (ih)->ih_item_location = cpu_to_le16(val); } while (0)
+#define put_ih_item_len(ih, val)     do { (ih)->ih_item_len = cpu_to_le16(val); } while (0)
+
+#define unreachable_item(ih) (ih_version(ih) & (1 << 15))
+
+#define get_ih_free_space(ih) (ih_version (ih) == KEY_FORMAT_3_6 ? 0 : ih_free_space (ih))
+#define set_ih_free_space(ih,val) put_ih_free_space((ih), ((ih_version(ih) == KEY_FORMAT_3_6) ? 0 : (val)))
+
+/* these operate on indirect items, where you've got an array of ints
+** at a possibly unaligned location.  These are a noop on ia32
+** 
+** p is the array of __u32, i is the index into the array, v is the value
+** to store there.
+*/
+#define get_block_num(p, i) get_unaligned_le32((p) + (i))
+#define put_block_num(p, i, v) put_unaligned_le32((v), (p) + (i))
+
+//
+// in old version uniqueness field shows key type
+//
+#define V1_SD_UNIQUENESS 0
+#define V1_INDIRECT_UNIQUENESS 0xfffffffe
+#define V1_DIRECT_UNIQUENESS 0xffffffff
+#define V1_DIRENTRY_UNIQUENESS 500
+#define V1_ANY_UNIQUENESS 555	// FIXME: comment is required
+
+//
+// here are conversion routines
+//
+static inline int uniqueness2type(__u32 uniqueness) CONSTF;
+static inline int uniqueness2type(__u32 uniqueness)
+{
+	switch ((int)uniqueness) {
+	case V1_SD_UNIQUENESS:
+		return TYPE_STAT_DATA;
+	case V1_INDIRECT_UNIQUENESS:
+		return TYPE_INDIRECT;
+	case V1_DIRECT_UNIQUENESS:
+		return TYPE_DIRECT;
+	case V1_DIRENTRY_UNIQUENESS:
+		return TYPE_DIRENTRY;
+	case V1_ANY_UNIQUENESS:
+	default:
+		return TYPE_ANY;
+	}
+}
+
+static inline __u32 type2uniqueness(int type) CONSTF;
+static inline __u32 type2uniqueness(int type)
+{
+	switch (type) {
+	case TYPE_STAT_DATA:
+		return V1_SD_UNIQUENESS;
+	case TYPE_INDIRECT:
+		return V1_INDIRECT_UNIQUENESS;
+	case TYPE_DIRECT:
+		return V1_DIRECT_UNIQUENESS;
+	case TYPE_DIRENTRY:
+		return V1_DIRENTRY_UNIQUENESS;
+	case TYPE_ANY:
+	default:
+		return V1_ANY_UNIQUENESS;
+	}
+}
+
+//
+// key is pointer to on disk key which is stored in le, result is cpu,
+// there is no way to get version of object from key, so, provide
+// version to these defines
+//
+static inline loff_t le_key_k_offset(int version,
+				     const struct reiserfs_key *key)
+{
+	return (version == KEY_FORMAT_3_5) ?
+	    le32_to_cpu(key->u.k_offset_v1.k_offset) :
+	    offset_v2_k_offset(&(key->u.k_offset_v2));
+}
+
+static inline loff_t le_ih_k_offset(const struct item_head *ih)
+{
+	return le_key_k_offset(ih_version(ih), &(ih->ih_key));
+}
+
+static inline loff_t le_key_k_type(int version, const struct reiserfs_key *key)
+{
+	return (version == KEY_FORMAT_3_5) ?
+	    uniqueness2type(le32_to_cpu(key->u.k_offset_v1.k_uniqueness)) :
+	    offset_v2_k_type(&(key->u.k_offset_v2));
+}
+
+static inline loff_t le_ih_k_type(const struct item_head *ih)
+{
+	return le_key_k_type(ih_version(ih), &(ih->ih_key));
+}
+
+static inline void set_le_key_k_offset(int version, struct reiserfs_key *key,
+				       loff_t offset)
+{
+	(version == KEY_FORMAT_3_5) ? (void)(key->u.k_offset_v1.k_offset = cpu_to_le32(offset)) :	/* jdm check */
+	    (void)(set_offset_v2_k_offset(&(key->u.k_offset_v2), offset));
+}
+
+static inline void set_le_ih_k_offset(struct item_head *ih, loff_t offset)
+{
+	set_le_key_k_offset(ih_version(ih), &(ih->ih_key), offset);
+}
+
+static inline void set_le_key_k_type(int version, struct reiserfs_key *key,
+				     int type)
+{
+	(version == KEY_FORMAT_3_5) ?
+	    (void)(key->u.k_offset_v1.k_uniqueness =
+		   cpu_to_le32(type2uniqueness(type)))
+	    : (void)(set_offset_v2_k_type(&(key->u.k_offset_v2), type));
+}
+
+static inline void set_le_ih_k_type(struct item_head *ih, int type)
+{
+	set_le_key_k_type(ih_version(ih), &(ih->ih_key), type);
+}
+
+static inline int is_direntry_le_key(int version, struct reiserfs_key *key)
+{
+	return le_key_k_type(version, key) == TYPE_DIRENTRY;
+}
+
+static inline int is_direct_le_key(int version, struct reiserfs_key *key)
+{
+	return le_key_k_type(version, key) == TYPE_DIRECT;
+}
+
+static inline int is_indirect_le_key(int version, struct reiserfs_key *key)
+{
+	return le_key_k_type(version, key) == TYPE_INDIRECT;
+}
+
+static inline int is_statdata_le_key(int version, struct reiserfs_key *key)
+{
+	return le_key_k_type(version, key) == TYPE_STAT_DATA;
+}
+
+//
+// item header has version.
+//
+static inline int is_direntry_le_ih(struct item_head *ih)
+{
+	return is_direntry_le_key(ih_version(ih), &ih->ih_key);
+}
+
+static inline int is_direct_le_ih(struct item_head *ih)
+{
+	return is_direct_le_key(ih_version(ih), &ih->ih_key);
+}
+
+static inline int is_indirect_le_ih(struct item_head *ih)
+{
+	return is_indirect_le_key(ih_version(ih), &ih->ih_key);
+}
+
+static inline int is_statdata_le_ih(struct item_head *ih)
+{
+	return is_statdata_le_key(ih_version(ih), &ih->ih_key);
+}
+
+//
+// key is pointer to cpu key, result is cpu
+//
+static inline loff_t cpu_key_k_offset(const struct cpu_key *key)
+{
+	return key->on_disk_key.k_offset;
+}
+
+static inline loff_t cpu_key_k_type(const struct cpu_key *key)
+{
+	return key->on_disk_key.k_type;
+}
+
+static inline void set_cpu_key_k_offset(struct cpu_key *key, loff_t offset)
+{
+	key->on_disk_key.k_offset = offset;
+}
+
+static inline void set_cpu_key_k_type(struct cpu_key *key, int type)
+{
+	key->on_disk_key.k_type = type;
+}
+
+static inline void cpu_key_k_offset_dec(struct cpu_key *key)
+{
+	key->on_disk_key.k_offset--;
+}
+
+#define is_direntry_cpu_key(key) (cpu_key_k_type (key) == TYPE_DIRENTRY)
+#define is_direct_cpu_key(key) (cpu_key_k_type (key) == TYPE_DIRECT)
+#define is_indirect_cpu_key(key) (cpu_key_k_type (key) == TYPE_INDIRECT)
+#define is_statdata_cpu_key(key) (cpu_key_k_type (key) == TYPE_STAT_DATA)
+
+/* are these used ? */
+#define is_direntry_cpu_ih(ih) (is_direntry_cpu_key (&((ih)->ih_key)))
+#define is_direct_cpu_ih(ih) (is_direct_cpu_key (&((ih)->ih_key)))
+#define is_indirect_cpu_ih(ih) (is_indirect_cpu_key (&((ih)->ih_key)))
+#define is_statdata_cpu_ih(ih) (is_statdata_cpu_key (&((ih)->ih_key)))
+
+#define I_K_KEY_IN_ITEM(ih, key, n_blocksize) \
+    (!COMP_SHORT_KEYS(ih, key) && \
+	  I_OFF_BYTE_IN_ITEM(ih, k_offset(key), n_blocksize))
+
+/* maximal length of item */
+#define MAX_ITEM_LEN(block_size) (block_size - BLKH_SIZE - IH_SIZE)
+#define MIN_ITEM_LEN 1
+
+/* object identifier for root dir */
+#define REISERFS_ROOT_OBJECTID 2
+#define REISERFS_ROOT_PARENT_OBJECTID 1
+
+extern struct reiserfs_key root_key;
+
+/* 
+ * Picture represents a leaf of the S+tree
+ *  ______________________________________________________
+ * |      |  Array of     |                   |           |
+ * |Block |  Object-Item  |      F r e e      |  Objects- |
+ * | head |  Headers      |     S p a c e     |   Items   |
+ * |______|_______________|___________________|___________|
+ */
+
+/* Header of a disk block.  More precisely, header of a formatted leaf
+   or internal node, and not the header of an unformatted node. */
+struct block_head {
+	__le16 blk_level;	/* Level of a block in the tree. */
+	__le16 blk_nr_item;	/* Number of keys/items in a block. */
+	__le16 blk_free_space;	/* Block free space in bytes. */
+	__le16 blk_reserved;
+	/* dump this in v4/planA */
+	struct reiserfs_key blk_right_delim_key;	/* kept only for compatibility */
+};
+
+#define BLKH_SIZE                     (sizeof(struct block_head))
+#define blkh_level(p_blkh)            (le16_to_cpu((p_blkh)->blk_level))
+#define blkh_nr_item(p_blkh)          (le16_to_cpu((p_blkh)->blk_nr_item))
+#define blkh_free_space(p_blkh)       (le16_to_cpu((p_blkh)->blk_free_space))
+#define blkh_reserved(p_blkh)         (le16_to_cpu((p_blkh)->blk_reserved))
+#define set_blkh_level(p_blkh,val)    ((p_blkh)->blk_level = cpu_to_le16(val))
+#define set_blkh_nr_item(p_blkh,val)  ((p_blkh)->blk_nr_item = cpu_to_le16(val))
+#define set_blkh_free_space(p_blkh,val) ((p_blkh)->blk_free_space = cpu_to_le16(val))
+#define set_blkh_reserved(p_blkh,val) ((p_blkh)->blk_reserved = cpu_to_le16(val))
+#define blkh_right_delim_key(p_blkh)  ((p_blkh)->blk_right_delim_key)
+#define set_blkh_right_delim_key(p_blkh,val)  ((p_blkh)->blk_right_delim_key = val)
+
+/*
+ * values for blk_level field of the struct block_head
+ */
+
+#define FREE_LEVEL 0		/* when node gets removed from the tree its
+				   blk_level is set to FREE_LEVEL. It is then
+				   used to see whether the node is still in the
+				   tree */
+
+#define DISK_LEAF_NODE_LEVEL  1	/* Leaf node level. */
+
+/* Given the buffer head of a formatted node, resolve to the block head of that node. */
+#define B_BLK_HEAD(bh)			((struct block_head *)((bh)->b_data))
+/* Number of items that are in buffer. */
+#define B_NR_ITEMS(bh)			(blkh_nr_item(B_BLK_HEAD(bh)))
+#define B_LEVEL(bh)			(blkh_level(B_BLK_HEAD(bh)))
+#define B_FREE_SPACE(bh)		(blkh_free_space(B_BLK_HEAD(bh)))
+
+#define PUT_B_NR_ITEMS(bh, val)		do { set_blkh_nr_item(B_BLK_HEAD(bh), val); } while (0)
+#define PUT_B_LEVEL(bh, val)		do { set_blkh_level(B_BLK_HEAD(bh), val); } while (0)
+#define PUT_B_FREE_SPACE(bh, val)	do { set_blkh_free_space(B_BLK_HEAD(bh), val); } while (0)
+
+/* Get right delimiting key. -- little endian */
+#define B_PRIGHT_DELIM_KEY(bh)		(&(blk_right_delim_key(B_BLK_HEAD(bh))))
+
+/* Does the buffer contain a disk leaf. */
+#define B_IS_ITEMS_LEVEL(bh)		(B_LEVEL(bh) == DISK_LEAF_NODE_LEVEL)
+
+/* Does the buffer contain a disk internal node */
+#define B_IS_KEYS_LEVEL(bh)      (B_LEVEL(bh) > DISK_LEAF_NODE_LEVEL \
+					    && B_LEVEL(bh) <= MAX_HEIGHT)
+
+/***************************************************************************/
+/*                             STAT DATA                                   */
+/***************************************************************************/
+
+//
+// old stat data is 32 bytes long. We are going to distinguish new one by
+// different size
+//
+struct stat_data_v1 {
+	__le16 sd_mode;		/* file type, permissions */
+	__le16 sd_nlink;	/* number of hard links */
+	__le16 sd_uid;		/* owner */
+	__le16 sd_gid;		/* group */
+	__le32 sd_size;		/* file size */
+	__le32 sd_atime;	/* time of last access */
+	__le32 sd_mtime;	/* time file was last modified  */
+	__le32 sd_ctime;	/* time inode (stat data) was last changed (except changes to sd_atime and sd_mtime) */
+	union {
+		__le32 sd_rdev;
+		__le32 sd_blocks;	/* number of blocks file uses */
+	} __attribute__ ((__packed__)) u;
+	__le32 sd_first_direct_byte;	/* first byte of file which is stored
+					   in a direct item: except that if it
+					   equals 1 it is a symlink and if it
+					   equals ~(__u32)0 there is no
+					   direct item.  The existence of this
+					   field really grates on me. Let's
+					   replace it with a macro based on
+					   sd_size and our tail suppression
+					   policy.  Someday.  -Hans */
+} __attribute__ ((__packed__));
+
+#define SD_V1_SIZE              (sizeof(struct stat_data_v1))
+#define stat_data_v1(ih)        (ih_version (ih) == KEY_FORMAT_3_5)
+#define sd_v1_mode(sdp)         (le16_to_cpu((sdp)->sd_mode))
+#define set_sd_v1_mode(sdp,v)   ((sdp)->sd_mode = cpu_to_le16(v))
+#define sd_v1_nlink(sdp)        (le16_to_cpu((sdp)->sd_nlink))
+#define set_sd_v1_nlink(sdp,v)  ((sdp)->sd_nlink = cpu_to_le16(v))
+#define sd_v1_uid(sdp)          (le16_to_cpu((sdp)->sd_uid))
+#define set_sd_v1_uid(sdp,v)    ((sdp)->sd_uid = cpu_to_le16(v))
+#define sd_v1_gid(sdp)          (le16_to_cpu((sdp)->sd_gid))
+#define set_sd_v1_gid(sdp,v)    ((sdp)->sd_gid = cpu_to_le16(v))
+#define sd_v1_size(sdp)         (le32_to_cpu((sdp)->sd_size))
+#define set_sd_v1_size(sdp,v)   ((sdp)->sd_size = cpu_to_le32(v))
+#define sd_v1_atime(sdp)        (le32_to_cpu((sdp)->sd_atime))
+#define set_sd_v1_atime(sdp,v)  ((sdp)->sd_atime = cpu_to_le32(v))
+#define sd_v1_mtime(sdp)        (le32_to_cpu((sdp)->sd_mtime))
+#define set_sd_v1_mtime(sdp,v)  ((sdp)->sd_mtime = cpu_to_le32(v))
+#define sd_v1_ctime(sdp)        (le32_to_cpu((sdp)->sd_ctime))
+#define set_sd_v1_ctime(sdp,v)  ((sdp)->sd_ctime = cpu_to_le32(v))
+#define sd_v1_rdev(sdp)         (le32_to_cpu((sdp)->u.sd_rdev))
+#define set_sd_v1_rdev(sdp,v)   ((sdp)->u.sd_rdev = cpu_to_le32(v))
+#define sd_v1_blocks(sdp)       (le32_to_cpu((sdp)->u.sd_blocks))
+#define set_sd_v1_blocks(sdp,v) ((sdp)->u.sd_blocks = cpu_to_le32(v))
+#define sd_v1_first_direct_byte(sdp) \
+                                (le32_to_cpu((sdp)->sd_first_direct_byte))
+#define set_sd_v1_first_direct_byte(sdp,v) \
+                                ((sdp)->sd_first_direct_byte = cpu_to_le32(v))
+
+/* inode flags stored in sd_attrs (nee sd_reserved) */
+
+/* we want common flags to have the same values as in ext2,
+   so chattr(1) will work without problems */
+#define REISERFS_IMMUTABLE_FL FS_IMMUTABLE_FL
+#define REISERFS_APPEND_FL    FS_APPEND_FL
+#define REISERFS_SYNC_FL      FS_SYNC_FL
+#define REISERFS_NOATIME_FL   FS_NOATIME_FL
+#define REISERFS_NODUMP_FL    FS_NODUMP_FL
+#define REISERFS_SECRM_FL     FS_SECRM_FL
+#define REISERFS_UNRM_FL      FS_UNRM_FL
+#define REISERFS_COMPR_FL     FS_COMPR_FL
+#define REISERFS_NOTAIL_FL    FS_NOTAIL_FL
+
+/* persistent flags that file inherits from the parent directory */
+#define REISERFS_INHERIT_MASK ( REISERFS_IMMUTABLE_FL |	\
+				REISERFS_SYNC_FL |	\
+				REISERFS_NOATIME_FL |	\
+				REISERFS_NODUMP_FL |	\
+				REISERFS_SECRM_FL |	\
+				REISERFS_COMPR_FL |	\
+				REISERFS_NOTAIL_FL )
+
+/* Stat Data on disk (reiserfs version of UFS disk inode minus the
+   address blocks) */
+struct stat_data {
+	__le16 sd_mode;		/* file type, permissions */
+	__le16 sd_attrs;	/* persistent inode flags */
+	__le32 sd_nlink;	/* number of hard links */
+	__le64 sd_size;		/* file size */
+	__le32 sd_uid;		/* owner */
+	__le32 sd_gid;		/* group */
+	__le32 sd_atime;	/* time of last access */
+	__le32 sd_mtime;	/* time file was last modified  */
+	__le32 sd_ctime;	/* time inode (stat data) was last changed (except changes to sd_atime and sd_mtime) */
+	__le32 sd_blocks;
+	union {
+		__le32 sd_rdev;
+		__le32 sd_generation;
+		//__le32 sd_first_direct_byte;
+		/* first byte of file which is stored in a
+		   direct item: except that if it equals 1
+		   it is a symlink and if it equals
+		   ~(__u32)0 there is no direct item.  The
+		   existence of this field really grates
+		   on me. Let's replace it with a macro
+		   based on sd_size and our tail
+		   suppression policy? */
+	} __attribute__ ((__packed__)) u;
+} __attribute__ ((__packed__));
+//
+// this is 44 bytes long
+//
+#define SD_SIZE (sizeof(struct stat_data))
+#define SD_V2_SIZE              SD_SIZE
+#define stat_data_v2(ih)        (ih_version (ih) == KEY_FORMAT_3_6)
+#define sd_v2_mode(sdp)         (le16_to_cpu((sdp)->sd_mode))
+#define set_sd_v2_mode(sdp,v)   ((sdp)->sd_mode = cpu_to_le16(v))
+/* sd_reserved */
+/* set_sd_reserved */
+#define sd_v2_nlink(sdp)        (le32_to_cpu((sdp)->sd_nlink))
+#define set_sd_v2_nlink(sdp,v)  ((sdp)->sd_nlink = cpu_to_le32(v))
+#define sd_v2_size(sdp)         (le64_to_cpu((sdp)->sd_size))
+#define set_sd_v2_size(sdp,v)   ((sdp)->sd_size = cpu_to_le64(v))
+#define sd_v2_uid(sdp)          (le32_to_cpu((sdp)->sd_uid))
+#define set_sd_v2_uid(sdp,v)    ((sdp)->sd_uid = cpu_to_le32(v))
+#define sd_v2_gid(sdp)          (le32_to_cpu((sdp)->sd_gid))
+#define set_sd_v2_gid(sdp,v)    ((sdp)->sd_gid = cpu_to_le32(v))
+#define sd_v2_atime(sdp)        (le32_to_cpu((sdp)->sd_atime))
+#define set_sd_v2_atime(sdp,v)  ((sdp)->sd_atime = cpu_to_le32(v))
+#define sd_v2_mtime(sdp)        (le32_to_cpu((sdp)->sd_mtime))
+#define set_sd_v2_mtime(sdp,v)  ((sdp)->sd_mtime = cpu_to_le32(v))
+#define sd_v2_ctime(sdp)        (le32_to_cpu((sdp)->sd_ctime))
+#define set_sd_v2_ctime(sdp,v)  ((sdp)->sd_ctime = cpu_to_le32(v))
+#define sd_v2_blocks(sdp)       (le32_to_cpu((sdp)->sd_blocks))
+#define set_sd_v2_blocks(sdp,v) ((sdp)->sd_blocks = cpu_to_le32(v))
+#define sd_v2_rdev(sdp)         (le32_to_cpu((sdp)->u.sd_rdev))
+#define set_sd_v2_rdev(sdp,v)   ((sdp)->u.sd_rdev = cpu_to_le32(v))
+#define sd_v2_generation(sdp)   (le32_to_cpu((sdp)->u.sd_generation))
+#define set_sd_v2_generation(sdp,v) ((sdp)->u.sd_generation = cpu_to_le32(v))
+#define sd_v2_attrs(sdp)         (le16_to_cpu((sdp)->sd_attrs))
+#define set_sd_v2_attrs(sdp,v)   ((sdp)->sd_attrs = cpu_to_le16(v))
+
+/***************************************************************************/
+/*                      DIRECTORY STRUCTURE                                */
+/***************************************************************************/
+/* 
+   Picture represents the structure of directory items
+   ________________________________________________
+   |  Array of     |   |     |        |       |   |
+   | directory     |N-1| N-2 | ....   |   1st |0th|
+   | entry headers |   |     |        |       |   |
+   |_______________|___|_____|________|_______|___|
+                    <----   directory entries         ------>
+
+ First directory item has k_offset component 1. We store "." and ".."
+ in one item, always, we never split "." and ".." into differing
+ items.  This makes, among other things, the code for removing
+ directories simpler. */
+#define SD_OFFSET  0
+#define SD_UNIQUENESS 0
+#define DOT_OFFSET 1
+#define DOT_DOT_OFFSET 2
+#define DIRENTRY_UNIQUENESS 500
+
+/* */
+#define FIRST_ITEM_OFFSET 1
+
+/*
+   Q: How to get key of object pointed to by entry from entry?  
+
+   A: Each directory entry has its header. This header has deh_dir_id and deh_objectid fields, those are key
+      of object, entry points to */
+
+/* NOT IMPLEMENTED:   
+   Directory will someday contain stat data of object */
+
+struct reiserfs_de_head {
+	__le32 deh_offset;	/* third component of the directory entry key */
+	__le32 deh_dir_id;	/* objectid of the parent directory of the object, that is referenced
+				   by directory entry */
+	__le32 deh_objectid;	/* objectid of the object, that is referenced by directory entry */
+	__le16 deh_location;	/* offset of name in the whole item */
+	__le16 deh_state;	/* whether 1) entry contains stat data (for future), and 2) whether
+				   entry is hidden (unlinked) */
+} __attribute__ ((__packed__));
+#define DEH_SIZE                  sizeof(struct reiserfs_de_head)
+#define deh_offset(p_deh)         (le32_to_cpu((p_deh)->deh_offset))
+#define deh_dir_id(p_deh)         (le32_to_cpu((p_deh)->deh_dir_id))
+#define deh_objectid(p_deh)       (le32_to_cpu((p_deh)->deh_objectid))
+#define deh_location(p_deh)       (le16_to_cpu((p_deh)->deh_location))
+#define deh_state(p_deh)          (le16_to_cpu((p_deh)->deh_state))
+
+#define put_deh_offset(p_deh,v)   ((p_deh)->deh_offset = cpu_to_le32((v)))
+#define put_deh_dir_id(p_deh,v)   ((p_deh)->deh_dir_id = cpu_to_le32((v)))
+#define put_deh_objectid(p_deh,v) ((p_deh)->deh_objectid = cpu_to_le32((v)))
+#define put_deh_location(p_deh,v) ((p_deh)->deh_location = cpu_to_le16((v)))
+#define put_deh_state(p_deh,v)    ((p_deh)->deh_state = cpu_to_le16((v)))
+
+/* empty directory contains two entries "." and ".." and their headers */
+#define EMPTY_DIR_SIZE \
+(DEH_SIZE * 2 + ROUND_UP (strlen (".")) + ROUND_UP (strlen ("..")))
+
+/* old format directories have this size when empty */
+#define EMPTY_DIR_SIZE_V1 (DEH_SIZE * 2 + 3)
+
+#define DEH_Statdata 0		/* not used now */
+#define DEH_Visible 2
+
+/* 64 bit systems (and the S/390) need to be aligned explicitly -jdm */
+#if BITS_PER_LONG == 64 || defined(__s390__) || defined(__hppa__)
+#   define ADDR_UNALIGNED_BITS  (3)
+#endif
+
+/* These are only used to manipulate deh_state.
+ * Because of this, we'll use the ext2_ bit routines,
+ * since they are little endian */
+#ifdef ADDR_UNALIGNED_BITS
+
+#   define aligned_address(addr)           ((void *)((long)(addr) & ~((1UL << ADDR_UNALIGNED_BITS) - 1)))
+#   define unaligned_offset(addr)          (((int)((long)(addr) & ((1 << ADDR_UNALIGNED_BITS) - 1))) << 3)
+
+#   define set_bit_unaligned(nr, addr)	\
+	__test_and_set_bit_le((nr) + unaligned_offset(addr), aligned_address(addr))
+#   define clear_bit_unaligned(nr, addr)	\
+	__test_and_clear_bit_le((nr) + unaligned_offset(addr), aligned_address(addr))
+#   define test_bit_unaligned(nr, addr)	\
+	test_bit_le((nr) + unaligned_offset(addr), aligned_address(addr))
+
+#else
+
+#   define set_bit_unaligned(nr, addr)	__test_and_set_bit_le(nr, addr)
+#   define clear_bit_unaligned(nr, addr)	__test_and_clear_bit_le(nr, addr)
+#   define test_bit_unaligned(nr, addr)	test_bit_le(nr, addr)
+
+#endif
+
+#define mark_de_with_sd(deh)        set_bit_unaligned (DEH_Statdata, &((deh)->deh_state))
+#define mark_de_without_sd(deh)     clear_bit_unaligned (DEH_Statdata, &((deh)->deh_state))
+#define mark_de_visible(deh)	    set_bit_unaligned (DEH_Visible, &((deh)->deh_state))
+#define mark_de_hidden(deh)	    clear_bit_unaligned (DEH_Visible, &((deh)->deh_state))
+
+#define de_with_sd(deh)		    test_bit_unaligned (DEH_Statdata, &((deh)->deh_state))
+#define de_visible(deh)	    	    test_bit_unaligned (DEH_Visible, &((deh)->deh_state))
+#define de_hidden(deh)	    	    !test_bit_unaligned (DEH_Visible, &((deh)->deh_state))
+
+extern void make_empty_dir_item_v1(char *body, __le32 dirid, __le32 objid,
+				   __le32 par_dirid, __le32 par_objid);
+extern void make_empty_dir_item(char *body, __le32 dirid, __le32 objid,
+				__le32 par_dirid, __le32 par_objid);
+
+/* array of the entry headers */
+ /* get item body */
+#define B_I_PITEM(bh,ih) ( (bh)->b_data + ih_location(ih) )
+#define B_I_DEH(bh,ih) ((struct reiserfs_de_head *)(B_I_PITEM(bh,ih)))
+
+/* length of the directory entry in directory item. This define
+   calculates length of i-th directory entry using directory entry
+   locations from dir entry head. When it calculates length of 0-th
+   directory entry, it uses length of whole item in place of entry
+   location of the non-existent following entry in the calculation.
+   See picture above.*/
+/*
+#define I_DEH_N_ENTRY_LENGTH(ih,deh,i) \
+((i) ? (deh_location((deh)-1) - deh_location((deh))) : (ih_item_len((ih)) - deh_location((deh))))
+*/
+static inline int entry_length(const struct buffer_head *bh,
+			       const struct item_head *ih, int pos_in_item)
+{
+	struct reiserfs_de_head *deh;
+
+	deh = B_I_DEH(bh, ih) + pos_in_item;
+	if (pos_in_item)
+		return deh_location(deh - 1) - deh_location(deh);
+
+	return ih_item_len(ih) - deh_location(deh);
+}
+
+/* number of entries in the directory item, depends on ENTRY_COUNT being at the start of directory dynamic data. */
+#define I_ENTRY_COUNT(ih) (ih_entry_count((ih)))
+
+/* name by bh, ih and entry_num */
+#define B_I_E_NAME(bh,ih,entry_num) ((char *)(bh->b_data + ih_location(ih) + deh_location(B_I_DEH(bh,ih)+(entry_num))))
+
+// two entries per block (at least)
+#define REISERFS_MAX_NAME(block_size) 255
+
+/* this structure is used for operations on directory entries. It is
+   not a disk structure. */
+/* When reiserfs_find_entry or search_by_entry_key find directory
+   entry, they return filled reiserfs_dir_entry structure */
+struct reiserfs_dir_entry {
+	struct buffer_head *de_bh;
+	int de_item_num;
+	struct item_head *de_ih;
+	int de_entry_num;
+	struct reiserfs_de_head *de_deh;
+	int de_entrylen;
+	int de_namelen;
+	char *de_name;
+	unsigned long *de_gen_number_bit_string;
+
+	__u32 de_dir_id;
+	__u32 de_objectid;
+
+	struct cpu_key de_entry_key;
+};
+
+/* these defines are useful when a particular member of a reiserfs_dir_entry is needed */
+
+/* pointer to file name, stored in entry */
+#define B_I_DEH_ENTRY_FILE_NAME(bh,ih,deh) (B_I_PITEM (bh, ih) + deh_location(deh))
+
+/* length of name */
+#define I_DEH_N_ENTRY_FILE_NAME_LENGTH(ih,deh,entry_num) \
+(I_DEH_N_ENTRY_LENGTH (ih, deh, entry_num) - (de_with_sd (deh) ? SD_SIZE : 0))
+
+/* hash value occupies bits from 7 up to 30 */
+#define GET_HASH_VALUE(offset) ((offset) & 0x7fffff80LL)
+/* generation number occupies 7 bits starting from 0 up to 6 */
+#define GET_GENERATION_NUMBER(offset) ((offset) & 0x7fLL)
+#define MAX_GENERATION_NUMBER  127
+
+#define SET_GENERATION_NUMBER(offset,gen_number) (GET_HASH_VALUE(offset)|(gen_number))
+
+/*
+ * Picture represents an internal node of the reiserfs tree
+ *  ______________________________________________________
+ * |      |  Array of     |  Array of         |  Free     |
+ * |block |    keys       |  pointers         | space     |
+ * | head |      N        |      N+1          |           |
+ * |______|_______________|___________________|___________|
+ */
+
+/***************************************************************************/
+/*                      DISK CHILD                                         */
+/***************************************************************************/
+/* Disk child pointer: The pointer from an internal node of the tree
+   to a node that is on disk. */
+struct disk_child {
+	__le32 dc_block_number;	/* Disk child's block number. */
+	__le16 dc_size;		/* Disk child's used space.   */
+	__le16 dc_reserved;
+};
+
+#define DC_SIZE (sizeof(struct disk_child))
+#define dc_block_number(dc_p)	(le32_to_cpu((dc_p)->dc_block_number))
+#define dc_size(dc_p)		(le16_to_cpu((dc_p)->dc_size))
+#define put_dc_block_number(dc_p, val)   do { (dc_p)->dc_block_number = cpu_to_le32(val); } while(0)
+#define put_dc_size(dc_p, val)   do { (dc_p)->dc_size = cpu_to_le16(val); } while(0)
+
+/* Get disk child by buffer header and position in the tree node. */
+#define B_N_CHILD(bh, n_pos)  ((struct disk_child *)\
+((bh)->b_data + BLKH_SIZE + B_NR_ITEMS(bh) * KEY_SIZE + DC_SIZE * (n_pos)))
+
+/* Get disk child number by buffer header and position in the tree node. */
+#define B_N_CHILD_NUM(bh, n_pos) (dc_block_number(B_N_CHILD(bh, n_pos)))
+#define PUT_B_N_CHILD_NUM(bh, n_pos, val) \
+				(put_dc_block_number(B_N_CHILD(bh, n_pos), val))
+
+ /* maximal value of field child_size in structure disk_child */
+ /* child size is the combined size of all items and their headers */
+#define MAX_CHILD_SIZE(bh) ((int)( (bh)->b_size - BLKH_SIZE ))
+
+/* amount of used space in buffer (not including block head) */
+#define B_CHILD_SIZE(cur) (MAX_CHILD_SIZE(cur)-(B_FREE_SPACE(cur)))
+
+/* max and min number of keys in internal node */
+#define MAX_NR_KEY(bh) ( (MAX_CHILD_SIZE(bh)-DC_SIZE)/(KEY_SIZE+DC_SIZE) )
+#define MIN_NR_KEY(bh)    (MAX_NR_KEY(bh)/2)
+
+/***************************************************************************/
+/*                      PATH STRUCTURES AND DEFINES                        */
+/***************************************************************************/
+
+/* Search_by_key fills up the path from the root to the leaf as it descends the tree looking for the
+   key.  It uses reiserfs_bread to try to find buffers in the cache given their block number.  If it
+   does not find them in the cache it reads them from disk.  For each node search_by_key finds using
+   reiserfs_bread it then uses bin_search to look through that node.  bin_search will find the
+   position of the block_number of the next node if it is looking through an internal node.  If it
+   is looking through a leaf node bin_search will find the position of the item which has key either
+   equal to given key, or which is the maximal key less than the given key. */
+
+struct path_element {
+	struct buffer_head *pe_buffer;	/* Pointer to the buffer at the path in the tree. */
+	int pe_position;	/* Position in the tree node which is placed in the */
+	/* buffer above.                                  */
+};
+
+#define MAX_HEIGHT 5		/* maximal height of a tree. don't change this without changing JOURNAL_PER_BALANCE_CNT */
+#define EXTENDED_MAX_HEIGHT         7	/* Must be equals MAX_HEIGHT + FIRST_PATH_ELEMENT_OFFSET */
+#define FIRST_PATH_ELEMENT_OFFSET   2	/* Must be equal to at least 2. */
+
+#define ILLEGAL_PATH_ELEMENT_OFFSET 1	/* Must be equal to FIRST_PATH_ELEMENT_OFFSET - 1 */
+#define MAX_FEB_SIZE 6		/* this MUST be MAX_HEIGHT + 1. See about FEB below */
+
+/* We need to keep track of who the ancestors of nodes are.  When we
+   perform a search we record which nodes were visited while
+   descending the tree looking for the node we searched for. This list
+   of nodes is called the path.  This information is used while
+   performing balancing.  Note that this path information may become
+   invalid, and this means we must check it when using it to see if it
+   is still valid. You'll need to read search_by_key and the comments
+   in it, especially about decrement_counters_in_path(), to understand
+   this structure.  
+
+Paths make the code so much harder to work with and debug.... An
+enormous number of bugs are due to them, and trying to write or modify
+code that uses them just makes my head hurt.  They are based on an
+excessive effort to avoid disturbing the precious VFS code.:-( The
+gods only know how we are going to SMP the code that uses them.
+znodes are the way! */
+
+#define PATH_READA	0x1	/* do read ahead */
+#define PATH_READA_BACK 0x2	/* read backwards */
+
+struct treepath {
+	int path_length;	/* Length of the array above.   */
+	int reada;
+	struct path_element path_elements[EXTENDED_MAX_HEIGHT];	/* Array of the path elements.  */
+	int pos_in_item;
+};
+
+#define pos_in_item(path) ((path)->pos_in_item)
+
+#define INITIALIZE_PATH(var) \
+struct treepath var = {.path_length = ILLEGAL_PATH_ELEMENT_OFFSET, .reada = 0,}
+
+/* Get path element by path and path position. */
+#define PATH_OFFSET_PELEMENT(path, n_offset)  ((path)->path_elements + (n_offset))
+
+/* Get buffer header at the path by path and path position. */
+#define PATH_OFFSET_PBUFFER(path, n_offset)   (PATH_OFFSET_PELEMENT(path, n_offset)->pe_buffer)
+
+/* Get position in the element at the path by path and path position. */
+#define PATH_OFFSET_POSITION(path, n_offset) (PATH_OFFSET_PELEMENT(path, n_offset)->pe_position)
+
+#define PATH_PLAST_BUFFER(path) (PATH_OFFSET_PBUFFER((path), (path)->path_length))
+				/* you know, to the person who didn't
+				   write this the macro name does not
+				   at first suggest what it does.
+				   Maybe POSITION_FROM_PATH_END? Or
+				   maybe we should just focus on
+				   dumping paths... -Hans */
+#define PATH_LAST_POSITION(path) (PATH_OFFSET_POSITION((path), (path)->path_length))
+
+#define PATH_PITEM_HEAD(path)    B_N_PITEM_HEAD(PATH_PLAST_BUFFER(path), PATH_LAST_POSITION(path))
+
+/* in do_balance leaf has h == 0 in contrast with path structure,
+   where root has level == 0. That is why we need these defines */
+#define PATH_H_PBUFFER(path, h) PATH_OFFSET_PBUFFER (path, path->path_length - (h))	/* tb->S[h] */
+#define PATH_H_PPARENT(path, h) PATH_H_PBUFFER (path, (h) + 1)	/* tb->F[h] or tb->S[0]->b_parent */
+#define PATH_H_POSITION(path, h) PATH_OFFSET_POSITION (path, path->path_length - (h))
+#define PATH_H_B_ITEM_ORDER(path, h) PATH_H_POSITION(path, h + 1)	/* tb->S[h]->b_item_order */
+
+#define PATH_H_PATH_OFFSET(path, n_h) ((path)->path_length - (n_h))
+
+#define get_last_bh(path) PATH_PLAST_BUFFER(path)
+#define get_ih(path) PATH_PITEM_HEAD(path)
+#define get_item_pos(path) PATH_LAST_POSITION(path)
+#define get_item(path) ((void *)B_N_PITEM(PATH_PLAST_BUFFER(path), PATH_LAST_POSITION (path)))
+#define item_moved(ih,path) comp_items(ih, path)
+#define path_changed(ih,path) comp_items (ih, path)
+
+/***************************************************************************/
+/*                       MISC                                              */
+/***************************************************************************/
+
+/* Size of pointer to the unformatted node. */
+#define UNFM_P_SIZE (sizeof(unp_t))
+#define UNFM_P_SHIFT 2
+
+// in in-core inode key is stored on le form
+#define INODE_PKEY(inode) ((struct reiserfs_key *)(REISERFS_I(inode)->i_key))
+
+#define MAX_UL_INT 0xffffffff
+#define MAX_INT    0x7ffffff
+#define MAX_US_INT 0xffff
+
+// reiserfs version 2 has max offset 60 bits. Version 1 - 32 bit offset
+#define U32_MAX (~(__u32)0)
+
+static inline loff_t max_reiserfs_offset(struct inode *inode)
+{
+	if (get_inode_item_key_version(inode) == KEY_FORMAT_3_5)
+		return (loff_t) U32_MAX;
+
+	return (loff_t) ((~(__u64) 0) >> 4);
+}
+
+/*#define MAX_KEY_UNIQUENESS	MAX_UL_INT*/
+#define MAX_KEY_OBJECTID	MAX_UL_INT
+
+#define MAX_B_NUM  MAX_UL_INT
+#define MAX_FC_NUM MAX_US_INT
+
+/* the purpose is to detect overflow of an unsigned short */
+#define REISERFS_LINK_MAX (MAX_US_INT - 1000)
+
+/* The following defines are used in reiserfs_insert_item and reiserfs_append_item  */
+#define REISERFS_KERNEL_MEM		0	/* reiserfs kernel memory mode  */
+#define REISERFS_USER_MEM		1	/* reiserfs user memory mode            */
+
+#define fs_generation(s) (REISERFS_SB(s)->s_generation_counter)
+#define get_generation(s) atomic_read (&fs_generation(s))
+#define FILESYSTEM_CHANGED_TB(tb)  (get_generation((tb)->tb_sb) != (tb)->fs_gen)
+#define __fs_changed(gen,s) (gen != get_generation (s))
+#define fs_changed(gen,s)		\
+({					\
+	reiserfs_cond_resched(s);	\
+	__fs_changed(gen, s);		\
+})
+
+/***************************************************************************/
+/*                  FIXATE NODES                                           */
+/***************************************************************************/
+
+#define VI_TYPE_LEFT_MERGEABLE 1
+#define VI_TYPE_RIGHT_MERGEABLE 2
+
+/* To make any changes in the tree we always first find node, that
+   contains item to be changed/deleted or place to insert a new
+   item. We call this node S. To do balancing we need to decide what
+   we will shift to left/right neighbor, or to a new node, where new
+   item will be etc. To make this analysis simpler we build virtual
+   node. Virtual node is an array of items, that will replace items of
+   node S. (For instance if we are going to delete an item, virtual
+   node does not contain it). Virtual node keeps information about
+   item sizes and types, mergeability of first and last items, sizes
+   of all entries in directory item. We use this array of items when
+   calculating what we can shift to neighbors and how many nodes we
+   have to have if we do not any shiftings, if we shift to left/right
+   neighbor or to both. */
+struct virtual_item {
+	int vi_index;		// index in the array of item operations
+	unsigned short vi_type;	// left/right mergeability
+	unsigned short vi_item_len;	/* length of item that it will have after balancing */
+	struct item_head *vi_ih;
+	const char *vi_item;	// body of item (old or new)
+	const void *vi_new_data;	// 0 always but paste mode
+	void *vi_uarea;		// item specific area
+};
+
+struct virtual_node {
+	char *vn_free_ptr;	/* this is a pointer to the free space in the buffer */
+	unsigned short vn_nr_item;	/* number of items in virtual node */
+	short vn_size;		/* size of node , that node would have if it has unlimited size and no balancing is performed */
+	short vn_mode;		/* mode of balancing (paste, insert, delete, cut) */
+	short vn_affected_item_num;
+	short vn_pos_in_item;
+	struct item_head *vn_ins_ih;	/* item header of inserted item, 0 for other modes */
+	const void *vn_data;
+	struct virtual_item *vn_vi;	/* array of items (including a new one, excluding item to be deleted) */
+};
+
+/* used by directory items when creating virtual nodes */
+struct direntry_uarea {
+	int flags;
+	__u16 entry_count;
+	__u16 entry_sizes[1];
+} __attribute__ ((__packed__));
+
+/***************************************************************************/
+/*                  TREE BALANCE                                           */
+/***************************************************************************/
+
+/* This temporary structure is used in tree balance algorithms, and
+   constructed as we go to the extent that its various parts are
+   needed.  It contains arrays of nodes that can potentially be
+   involved in the balancing of node S, and parameters that define how
+   each of the nodes must be balanced.  Note that in these algorithms
+   for balancing the worst case is to need to balance the current node
+   S and the left and right neighbors and all of their parents plus
+   create a new node.  We implement S1 balancing for the leaf nodes
+   and S0 balancing for the internal nodes (S1 and S0 are defined in
+   our papers.)*/
+
+#define MAX_FREE_BLOCK 7	/* size of the array of buffers to free at end of do_balance */
+
+/* maximum number of FEB blocknrs on a single level */
+#define MAX_AMOUNT_NEEDED 2
+
+/* someday somebody will prefix every field in this struct with tb_ */
+struct tree_balance {
+	int tb_mode;
+	int need_balance_dirty;
+	struct super_block *tb_sb;
+	struct reiserfs_transaction_handle *transaction_handle;
+	struct treepath *tb_path;
+	struct buffer_head *L[MAX_HEIGHT];	/* array of left neighbors of nodes in the path */
+	struct buffer_head *R[MAX_HEIGHT];	/* array of right neighbors of nodes in the path */
+	struct buffer_head *FL[MAX_HEIGHT];	/* array of fathers of the left  neighbors      */
+	struct buffer_head *FR[MAX_HEIGHT];	/* array of fathers of the right neighbors      */
+	struct buffer_head *CFL[MAX_HEIGHT];	/* array of common parents of center node and its left neighbor  */
+	struct buffer_head *CFR[MAX_HEIGHT];	/* array of common parents of center node and its right neighbor */
+
+	struct buffer_head *FEB[MAX_FEB_SIZE];	/* array of empty buffers. Number of buffers in array equals
+						   cur_blknum. */
+	struct buffer_head *used[MAX_FEB_SIZE];
+	struct buffer_head *thrown[MAX_FEB_SIZE];
+	int lnum[MAX_HEIGHT];	/* array of number of items which must be
+				   shifted to the left in order to balance the
+				   current node; for leaves includes item that
+				   will be partially shifted; for internal
+				   nodes, it is the number of child pointers
+				   rather than items. It includes the new item
+				   being created. The code sometimes subtracts
+				   one to get the number of wholly shifted
+				   items for other purposes. */
+	int rnum[MAX_HEIGHT];	/* substitute right for left in comment above */
+	int lkey[MAX_HEIGHT];	/* array indexed by height h mapping the key delimiting L[h] and
+				   S[h] to its item number within the node CFL[h] */
+	int rkey[MAX_HEIGHT];	/* substitute r for l in comment above */
+	int insert_size[MAX_HEIGHT];	/* the number of bytes by we are trying to add or remove from
+					   S[h]. A negative value means removing.  */
+	int blknum[MAX_HEIGHT];	/* number of nodes that will replace node S[h] after
+				   balancing on the level h of the tree.  If 0 then S is
+				   being deleted, if 1 then S is remaining and no new nodes
+				   are being created, if 2 or 3 then 1 or 2 new nodes is
+				   being created */
+
+	/* fields that are used only for balancing leaves of the tree */
+	int cur_blknum;		/* number of empty blocks having been already allocated                 */
+	int s0num;		/* number of items that fall into left most  node when S[0] splits     */
+	int s1num;		/* number of items that fall into first  new node when S[0] splits     */
+	int s2num;		/* number of items that fall into second new node when S[0] splits     */
+	int lbytes;		/* number of bytes which can flow to the left neighbor from the        left    */
+	/* most liquid item that cannot be shifted from S[0] entirely         */
+	/* if -1 then nothing will be partially shifted */
+	int rbytes;		/* number of bytes which will flow to the right neighbor from the right        */
+	/* most liquid item that cannot be shifted from S[0] entirely         */
+	/* if -1 then nothing will be partially shifted                           */
+	int s1bytes;		/* number of bytes which flow to the first  new node when S[0] splits   */
+	/* note: if S[0] splits into 3 nodes, then items do not need to be cut  */
+	int s2bytes;
+	struct buffer_head *buf_to_free[MAX_FREE_BLOCK];	/* buffers which are to be freed after do_balance finishes by unfix_nodes */
+	char *vn_buf;		/* kmalloced memory. Used to create
+				   virtual node and keep map of
+				   dirtied bitmap blocks */
+	int vn_buf_size;	/* size of the vn_buf */
+	struct virtual_node *tb_vn;	/* VN starts after bitmap of bitmap blocks */
+
+	int fs_gen;		/* saved value of `reiserfs_generation' counter
+				   see FILESYSTEM_CHANGED() macro in reiserfs_fs.h */
+#ifdef DISPLACE_NEW_PACKING_LOCALITIES
+	struct in_core_key key;	/* key pointer, to pass to block allocator or
+				   another low-level subsystem */
+#endif
+};
+
+/* These are modes of balancing */
+
+/* When inserting an item. */
+#define M_INSERT	'i'
+/* When inserting into (directories only) or appending onto an already
+   existent item. */
+#define M_PASTE		'p'
+/* When deleting an item. */
+#define M_DELETE	'd'
+/* When truncating an item or removing an entry from a (directory) item. */
+#define M_CUT 		'c'
+
+/* used when balancing on leaf level skipped (in reiserfsck) */
+#define M_INTERNAL	'n'
+
+/* When further balancing is not needed, then do_balance does not need
+   to be called. */
+#define M_SKIP_BALANCING 		's'
+#define M_CONVERT	'v'
+
+/* modes of leaf_move_items */
+#define LEAF_FROM_S_TO_L 0
+#define LEAF_FROM_S_TO_R 1
+#define LEAF_FROM_R_TO_L 2
+#define LEAF_FROM_L_TO_R 3
+#define LEAF_FROM_S_TO_SNEW 4
+
+#define FIRST_TO_LAST 0
+#define LAST_TO_FIRST 1
+
+/* used in do_balance for passing parent of node information that has
+   been gotten from tb struct */
+struct buffer_info {
+	struct tree_balance *tb;
+	struct buffer_head *bi_bh;
+	struct buffer_head *bi_parent;
+	int bi_position;
+};
+
+static inline struct super_block *sb_from_tb(struct tree_balance *tb)
+{
+	return tb ? tb->tb_sb : NULL;
+}
+
+static inline struct super_block *sb_from_bi(struct buffer_info *bi)
+{
+	return bi ? sb_from_tb(bi->tb) : NULL;
+}
+
+/* there are 4 types of items: stat data, directory item, indirect, direct.
++-------------------+------------+--------------+------------+
+|	            |  k_offset  | k_uniqueness | mergeable? |
++-------------------+------------+--------------+------------+
+|     stat data     |	0        |      0       |   no       |
++-------------------+------------+--------------+------------+
+| 1st directory item| DOT_OFFSET |DIRENTRY_UNIQUENESS|   no       | 
+| non 1st directory | hash value |              |   yes      |
+|     item          |            |              |            |
++-------------------+------------+--------------+------------+
+| indirect item     | offset + 1 |TYPE_INDIRECT |   if this is not the first indirect item of the object
++-------------------+------------+--------------+------------+
+| direct item       | offset + 1 |TYPE_DIRECT   | if not this is not the first direct item of the object
++-------------------+------------+--------------+------------+
+*/
+
+struct item_operations {
+	int (*bytes_number) (struct item_head * ih, int block_size);
+	void (*decrement_key) (struct cpu_key *);
+	int (*is_left_mergeable) (struct reiserfs_key * ih,
+				  unsigned long bsize);
+	void (*print_item) (struct item_head *, char *item);
+	void (*check_item) (struct item_head *, char *item);
+
+	int (*create_vi) (struct virtual_node * vn, struct virtual_item * vi,
+			  int is_affected, int insert_size);
+	int (*check_left) (struct virtual_item * vi, int free,
+			   int start_skip, int end_skip);
+	int (*check_right) (struct virtual_item * vi, int free);
+	int (*part_size) (struct virtual_item * vi, int from, int to);
+	int (*unit_num) (struct virtual_item * vi);
+	void (*print_vi) (struct virtual_item * vi);
+};
+
+extern struct item_operations *item_ops[TYPE_ANY + 1];
+
+#define op_bytes_number(ih,bsize)                    item_ops[le_ih_k_type (ih)]->bytes_number (ih, bsize)
+#define op_is_left_mergeable(key,bsize)              item_ops[le_key_k_type (le_key_version (key), key)]->is_left_mergeable (key, bsize)
+#define op_print_item(ih,item)                       item_ops[le_ih_k_type (ih)]->print_item (ih, item)
+#define op_check_item(ih,item)                       item_ops[le_ih_k_type (ih)]->check_item (ih, item)
+#define op_create_vi(vn,vi,is_affected,insert_size)  item_ops[le_ih_k_type ((vi)->vi_ih)]->create_vi (vn,vi,is_affected,insert_size)
+#define op_check_left(vi,free,start_skip,end_skip) item_ops[(vi)->vi_index]->check_left (vi, free, start_skip, end_skip)
+#define op_check_right(vi,free)                      item_ops[(vi)->vi_index]->check_right (vi, free)
+#define op_part_size(vi,from,to)                     item_ops[(vi)->vi_index]->part_size (vi, from, to)
+#define op_unit_num(vi)				     item_ops[(vi)->vi_index]->unit_num (vi)
+#define op_print_vi(vi)                              item_ops[(vi)->vi_index]->print_vi (vi)
+
+#define COMP_SHORT_KEYS comp_short_keys
+
+/* number of blocks pointed to by the indirect item */
+#define I_UNFM_NUM(ih)	(ih_item_len(ih) / UNFM_P_SIZE)
+
+/* the used space within the unformatted node corresponding to pos within the item pointed to by ih */
+#define I_POS_UNFM_SIZE(ih,pos,size) (((pos) == I_UNFM_NUM(ih) - 1 ) ? (size) - ih_free_space(ih) : (size))
+
+/* number of bytes contained by the direct item or the unformatted nodes the indirect item points to */
+
+/* get the item header */
+#define B_N_PITEM_HEAD(bh,item_num) ( (struct item_head * )((bh)->b_data + BLKH_SIZE) + (item_num) )
+
+/* get key */
+#define B_N_PDELIM_KEY(bh,item_num) ( (struct reiserfs_key * )((bh)->b_data + BLKH_SIZE) + (item_num) )
+
+/* get the key */
+#define B_N_PKEY(bh,item_num) ( &(B_N_PITEM_HEAD(bh,item_num)->ih_key) )
+
+/* get item body */
+#define B_N_PITEM(bh,item_num) ( (bh)->b_data + ih_location(B_N_PITEM_HEAD((bh),(item_num))))
+
+/* get the stat data by the buffer header and the item order */
+#define B_N_STAT_DATA(bh,nr) \
+( (struct stat_data *)((bh)->b_data + ih_location(B_N_PITEM_HEAD((bh),(nr))) ) )
+
+    /* following defines use reiserfs buffer header and item header */
+
+/* get stat-data */
+#define B_I_STAT_DATA(bh, ih) ( (struct stat_data * )((bh)->b_data + ih_location(ih)) )
+
+// this is 3976 for size==4096
+#define MAX_DIRECT_ITEM_LEN(size) ((size) - BLKH_SIZE - 2*IH_SIZE - SD_SIZE - UNFM_P_SIZE)
+
+/* indirect items consist of entries which contain blocknrs, pos
+   indicates which entry, and B_I_POS_UNFM_POINTER resolves to the
+   blocknr contained by the entry pos points to */
+#define B_I_POS_UNFM_POINTER(bh,ih,pos) le32_to_cpu(*(((unp_t *)B_I_PITEM(bh,ih)) + (pos)))
+#define PUT_B_I_POS_UNFM_POINTER(bh,ih,pos, val) do {*(((unp_t *)B_I_PITEM(bh,ih)) + (pos)) = cpu_to_le32(val); } while (0)
+
+struct reiserfs_iget_args {
+	__u32 objectid;
+	__u32 dirid;
+};
+
+/***************************************************************************/
+/*                    FUNCTION DECLARATIONS                                */
+/***************************************************************************/
+
+#define get_journal_desc_magic(bh) (bh->b_data + bh->b_size - 12)
+
+#define journal_trans_half(blocksize) \
+	((blocksize - sizeof (struct reiserfs_journal_desc) + sizeof (__u32) - 12) / sizeof (__u32))
+
+/* journal.c see journal.c for all the comments here */
+
+/* first block written in a commit.  */
+struct reiserfs_journal_desc {
+	__le32 j_trans_id;	/* id of commit */
+	__le32 j_len;		/* length of commit. len +1 is the commit block */
+	__le32 j_mount_id;	/* mount id of this trans */
+	__le32 j_realblock[1];	/* real locations for each block */
+};
+
+#define get_desc_trans_id(d)   le32_to_cpu((d)->j_trans_id)
+#define get_desc_trans_len(d)  le32_to_cpu((d)->j_len)
+#define get_desc_mount_id(d)   le32_to_cpu((d)->j_mount_id)
+
+#define set_desc_trans_id(d,val)       do { (d)->j_trans_id = cpu_to_le32 (val); } while (0)
+#define set_desc_trans_len(d,val)      do { (d)->j_len = cpu_to_le32 (val); } while (0)
+#define set_desc_mount_id(d,val)       do { (d)->j_mount_id = cpu_to_le32 (val); } while (0)
+
+/* last block written in a commit */
+struct reiserfs_journal_commit {
+	__le32 j_trans_id;	/* must match j_trans_id from the desc block */
+	__le32 j_len;		/* ditto */
+	__le32 j_realblock[1];	/* real locations for each block */
+};
+
+#define get_commit_trans_id(c) le32_to_cpu((c)->j_trans_id)
+#define get_commit_trans_len(c)        le32_to_cpu((c)->j_len)
+#define get_commit_mount_id(c) le32_to_cpu((c)->j_mount_id)
+
+#define set_commit_trans_id(c,val)     do { (c)->j_trans_id = cpu_to_le32 (val); } while (0)
+#define set_commit_trans_len(c,val)    do { (c)->j_len = cpu_to_le32 (val); } while (0)
+
+/* this header block gets written whenever a transaction is considered fully flushed, and is more recent than the
+** last fully flushed transaction.  fully flushed means all the log blocks and all the real blocks are on disk,
+** and this transaction does not need to be replayed.
+*/
+struct reiserfs_journal_header {
+	__le32 j_last_flush_trans_id;	/* id of last fully flushed transaction */
+	__le32 j_first_unflushed_offset;	/* offset in the log of where to start replay after a crash */
+	__le32 j_mount_id;
+	/* 12 */ struct journal_params jh_journal;
+};
+
+/* biggest tunable defines are right here */
+#define JOURNAL_BLOCK_COUNT 8192	/* number of blocks in the journal */
+#define JOURNAL_TRANS_MAX_DEFAULT 1024	/* biggest possible single transaction, don't change for now (8/3/99) */
+#define JOURNAL_TRANS_MIN_DEFAULT 256
+#define JOURNAL_MAX_BATCH_DEFAULT   900	/* max blocks to batch into one transaction, don't make this any bigger than 900 */
+#define JOURNAL_MIN_RATIO 2
+#define JOURNAL_MAX_COMMIT_AGE 30
+#define JOURNAL_MAX_TRANS_AGE 30
+#define JOURNAL_PER_BALANCE_CNT (3 * (MAX_HEIGHT-2) + 9)
+#define JOURNAL_BLOCKS_PER_OBJECT(sb)  (JOURNAL_PER_BALANCE_CNT * 3 + \
+					 2 * (REISERFS_QUOTA_INIT_BLOCKS(sb) + \
+					      REISERFS_QUOTA_TRANS_BLOCKS(sb)))
+
+#ifdef CONFIG_QUOTA
+#define REISERFS_QUOTA_OPTS ((1 << REISERFS_USRQUOTA) | (1 << REISERFS_GRPQUOTA))
+/* We need to update data and inode (atime) */
+#define REISERFS_QUOTA_TRANS_BLOCKS(s) (REISERFS_SB(s)->s_mount_opt & REISERFS_QUOTA_OPTS ? 2 : 0)
+/* 1 balancing, 1 bitmap, 1 data per write + stat data update */
+#define REISERFS_QUOTA_INIT_BLOCKS(s) (REISERFS_SB(s)->s_mount_opt & REISERFS_QUOTA_OPTS ? \
+(DQUOT_INIT_ALLOC*(JOURNAL_PER_BALANCE_CNT+2)+DQUOT_INIT_REWRITE+1) : 0)
+/* same as with INIT */
+#define REISERFS_QUOTA_DEL_BLOCKS(s) (REISERFS_SB(s)->s_mount_opt & REISERFS_QUOTA_OPTS ? \
+(DQUOT_DEL_ALLOC*(JOURNAL_PER_BALANCE_CNT+2)+DQUOT_DEL_REWRITE+1) : 0)
+#else
+#define REISERFS_QUOTA_TRANS_BLOCKS(s) 0
+#define REISERFS_QUOTA_INIT_BLOCKS(s) 0
+#define REISERFS_QUOTA_DEL_BLOCKS(s) 0
+#endif
+
+/* both of these can be as low as 1, or as high as you want.  The min is the
+** number of 4k bitmap nodes preallocated on mount. New nodes are allocated
+** as needed, and released when transactions are committed.  On release, if 
+** the current number of nodes is > max, the node is freed, otherwise, 
+** it is put on a free list for faster use later.
+*/
+#define REISERFS_MIN_BITMAP_NODES 10
+#define REISERFS_MAX_BITMAP_NODES 100
+
+#define JBH_HASH_SHIFT 13	/* these are based on journal hash size of 8192 */
+#define JBH_HASH_MASK 8191
+
+#define _jhashfn(sb,block)	\
+	(((unsigned long)sb>>L1_CACHE_SHIFT) ^ \
+	 (((block)<<(JBH_HASH_SHIFT - 6)) ^ ((block) >> 13) ^ ((block) << (JBH_HASH_SHIFT - 12))))
+#define journal_hash(t,sb,block) ((t)[_jhashfn((sb),(block)) & JBH_HASH_MASK])
+
+// We need these to make journal.c code more readable
+#define journal_find_get_block(s, block) __find_get_block(SB_JOURNAL(s)->j_dev_bd, block, s->s_blocksize)
+#define journal_getblk(s, block) __getblk(SB_JOURNAL(s)->j_dev_bd, block, s->s_blocksize)
+#define journal_bread(s, block) __bread(SB_JOURNAL(s)->j_dev_bd, block, s->s_blocksize)
+
+enum reiserfs_bh_state_bits {
+	BH_JDirty = BH_PrivateStart,	/* buffer is in current transaction */
+	BH_JDirty_wait,
+	BH_JNew,		/* disk block was taken off free list before
+				 * being in a finished transaction, or
+				 * written to disk. Can be reused immed. */
+	BH_JPrepared,
+	BH_JRestore_dirty,
+	BH_JTest,		// debugging only will go away
+};
+
+BUFFER_FNS(JDirty, journaled);
+TAS_BUFFER_FNS(JDirty, journaled);
+BUFFER_FNS(JDirty_wait, journal_dirty);
+TAS_BUFFER_FNS(JDirty_wait, journal_dirty);
+BUFFER_FNS(JNew, journal_new);
+TAS_BUFFER_FNS(JNew, journal_new);
+BUFFER_FNS(JPrepared, journal_prepared);
+TAS_BUFFER_FNS(JPrepared, journal_prepared);
+BUFFER_FNS(JRestore_dirty, journal_restore_dirty);
+TAS_BUFFER_FNS(JRestore_dirty, journal_restore_dirty);
+BUFFER_FNS(JTest, journal_test);
+TAS_BUFFER_FNS(JTest, journal_test);
+
+/*
+** transaction handle which is passed around for all journal calls
+*/
+struct reiserfs_transaction_handle {
+	struct super_block *t_super;	/* super for this FS when journal_begin was
+					   called. saves calls to reiserfs_get_super
+					   also used by nested transactions to make
+					   sure they are nesting on the right FS
+					   _must_ be first in the handle
+					 */
+	int t_refcount;
+	int t_blocks_logged;	/* number of blocks this writer has logged */
+	int t_blocks_allocated;	/* number of blocks this writer allocated */
+	unsigned int t_trans_id;	/* sanity check, equals the current trans id */
+	void *t_handle_save;	/* save existing current->journal_info */
+	unsigned displace_new_blocks:1;	/* if new block allocation occurres, that block
+					   should be displaced from others */
+	struct list_head t_list;
+};
+
+/* used to keep track of ordered and tail writes, attached to the buffer
+ * head through b_journal_head.
+ */
+struct reiserfs_jh {
+	struct reiserfs_journal_list *jl;
+	struct buffer_head *bh;
+	struct list_head list;
+};
+
+void reiserfs_free_jh(struct buffer_head *bh);
+int reiserfs_add_tail_list(struct inode *inode, struct buffer_head *bh);
+int reiserfs_add_ordered_list(struct inode *inode, struct buffer_head *bh);
+int journal_mark_dirty(struct reiserfs_transaction_handle *,
+		       struct super_block *, struct buffer_head *bh);
+
+static inline int reiserfs_file_data_log(struct inode *inode)
+{
+	if (reiserfs_data_log(inode->i_sb) ||
+	    (REISERFS_I(inode)->i_flags & i_data_log))
+		return 1;
+	return 0;
+}
+
+static inline int reiserfs_transaction_running(struct super_block *s)
+{
+	struct reiserfs_transaction_handle *th = current->journal_info;
+	if (th && th->t_super == s)
+		return 1;
+	if (th && th->t_super == NULL)
+		BUG();
+	return 0;
+}
+
+static inline int reiserfs_transaction_free_space(struct reiserfs_transaction_handle *th)
+{
+	return th->t_blocks_allocated - th->t_blocks_logged;
+}
+
+struct reiserfs_transaction_handle *reiserfs_persistent_transaction(struct
+								    super_block
+								    *,
+								    int count);
+int reiserfs_end_persistent_transaction(struct reiserfs_transaction_handle *);
+int reiserfs_commit_page(struct inode *inode, struct page *page,
+			 unsigned from, unsigned to);
+int reiserfs_flush_old_commits(struct super_block *);
+int reiserfs_commit_for_inode(struct inode *);
+int reiserfs_inode_needs_commit(struct inode *);
+void reiserfs_update_inode_transaction(struct inode *);
+void reiserfs_wait_on_write_block(struct super_block *s);
+void reiserfs_block_writes(struct reiserfs_transaction_handle *th);
+void reiserfs_allow_writes(struct super_block *s);
+void reiserfs_check_lock_depth(struct super_block *s, char *caller);
+int reiserfs_prepare_for_journal(struct super_block *, struct buffer_head *bh,
+				 int wait);
+void reiserfs_restore_prepared_buffer(struct super_block *,
+				      struct buffer_head *bh);
+int journal_init(struct super_block *, const char *j_dev_name, int old_format,
+		 unsigned int);
+int journal_release(struct reiserfs_transaction_handle *, struct super_block *);
+int journal_release_error(struct reiserfs_transaction_handle *,
+			  struct super_block *);
+int journal_end(struct reiserfs_transaction_handle *, struct super_block *,
+		unsigned long);
+int journal_end_sync(struct reiserfs_transaction_handle *, struct super_block *,
+		     unsigned long);
+int journal_mark_freed(struct reiserfs_transaction_handle *,
+		       struct super_block *, b_blocknr_t blocknr);
+int journal_transaction_should_end(struct reiserfs_transaction_handle *, int);
+int reiserfs_in_journal(struct super_block *sb, unsigned int bmap_nr,
+			 int bit_nr, int searchall, b_blocknr_t *next);
+int journal_begin(struct reiserfs_transaction_handle *,
+		  struct super_block *sb, unsigned long);
+int journal_join_abort(struct reiserfs_transaction_handle *,
+		       struct super_block *sb, unsigned long);
+void reiserfs_abort_journal(struct super_block *sb, int errno);
+void reiserfs_abort(struct super_block *sb, int errno, const char *fmt, ...);
+int reiserfs_allocate_list_bitmaps(struct super_block *s,
+				   struct reiserfs_list_bitmap *, unsigned int);
+
+void add_save_link(struct reiserfs_transaction_handle *th,
+		   struct inode *inode, int truncate);
+int remove_save_link(struct inode *inode, int truncate);
+
+/* objectid.c */
+__u32 reiserfs_get_unused_objectid(struct reiserfs_transaction_handle *th);
+void reiserfs_release_objectid(struct reiserfs_transaction_handle *th,
+			       __u32 objectid_to_release);
+int reiserfs_convert_objectid_map_v1(struct super_block *);
+
+/* stree.c */
+int B_IS_IN_TREE(const struct buffer_head *);
+extern void copy_item_head(struct item_head *to,
+			   const struct item_head *from);
+
+// first key is in cpu form, second - le
+extern int comp_short_keys(const struct reiserfs_key *le_key,
+			   const struct cpu_key *cpu_key);
+extern void le_key2cpu_key(struct cpu_key *to, const struct reiserfs_key *from);
+
+// both are in le form
+extern int comp_le_keys(const struct reiserfs_key *,
+			const struct reiserfs_key *);
+extern int comp_short_le_keys(const struct reiserfs_key *,
+			      const struct reiserfs_key *);
+
+//
+// get key version from on disk key - kludge
+//
+static inline int le_key_version(const struct reiserfs_key *key)
+{
+	int type;
+
+	type = offset_v2_k_type(&(key->u.k_offset_v2));
+	if (type != TYPE_DIRECT && type != TYPE_INDIRECT
+	    && type != TYPE_DIRENTRY)
+		return KEY_FORMAT_3_5;
+
+	return KEY_FORMAT_3_6;
+
+}
+
+static inline void copy_key(struct reiserfs_key *to,
+			    const struct reiserfs_key *from)
+{
+	memcpy(to, from, KEY_SIZE);
+}
+
+int comp_items(const struct item_head *stored_ih, const struct treepath *path);
+const struct reiserfs_key *get_rkey(const struct treepath *chk_path,
+				    const struct super_block *sb);
+int search_by_key(struct super_block *, const struct cpu_key *,
+		  struct treepath *, int);
+#define search_item(s,key,path) search_by_key (s, key, path, DISK_LEAF_NODE_LEVEL)
+int search_for_position_by_key(struct super_block *sb,
+			       const struct cpu_key *cpu_key,
+			       struct treepath *search_path);
+extern void decrement_bcount(struct buffer_head *bh);
+void decrement_counters_in_path(struct treepath *search_path);
+void pathrelse(struct treepath *search_path);
+int reiserfs_check_path(struct treepath *p);
+void pathrelse_and_restore(struct super_block *s, struct treepath *search_path);
+
+int reiserfs_insert_item(struct reiserfs_transaction_handle *th,
+			 struct treepath *path,
+			 const struct cpu_key *key,
+			 struct item_head *ih,
+			 struct inode *inode, const char *body);
+
+int reiserfs_paste_into_item(struct reiserfs_transaction_handle *th,
+			     struct treepath *path,
+			     const struct cpu_key *key,
+			     struct inode *inode,
+			     const char *body, int paste_size);
+
+int reiserfs_cut_from_item(struct reiserfs_transaction_handle *th,
+			   struct treepath *path,
+			   struct cpu_key *key,
+			   struct inode *inode,
+			   struct page *page, loff_t new_file_size);
+
+int reiserfs_delete_item(struct reiserfs_transaction_handle *th,
+			 struct treepath *path,
+			 const struct cpu_key *key,
+			 struct inode *inode, struct buffer_head *un_bh);
+
+void reiserfs_delete_solid_item(struct reiserfs_transaction_handle *th,
+				struct inode *inode, struct reiserfs_key *key);
+int reiserfs_delete_object(struct reiserfs_transaction_handle *th,
+			   struct inode *inode);
+int reiserfs_do_truncate(struct reiserfs_transaction_handle *th,
+			 struct inode *inode, struct page *,
+			 int update_timestamps);
+
+#define i_block_size(inode) ((inode)->i_sb->s_blocksize)
+#define file_size(inode) ((inode)->i_size)
+#define tail_size(inode) (file_size (inode) & (i_block_size (inode) - 1))
+
+#define tail_has_to_be_packed(inode) (have_large_tails ((inode)->i_sb)?\
+!STORE_TAIL_IN_UNFM_S1(file_size (inode), tail_size(inode), inode->i_sb->s_blocksize):have_small_tails ((inode)->i_sb)?!STORE_TAIL_IN_UNFM_S2(file_size (inode), tail_size(inode), inode->i_sb->s_blocksize):0 )
+
+void padd_item(char *item, int total_length, int length);
+
+/* inode.c */
+/* args for the create parameter of reiserfs_get_block */
+#define GET_BLOCK_NO_CREATE 0	/* don't create new blocks or convert tails */
+#define GET_BLOCK_CREATE 1	/* add anything you need to find block */
+#define GET_BLOCK_NO_HOLE 2	/* return -ENOENT for file holes */
+#define GET_BLOCK_READ_DIRECT 4	/* read the tail if indirect item not found */
+#define GET_BLOCK_NO_IMUX     8	/* i_mutex is not held, don't preallocate */
+#define GET_BLOCK_NO_DANGLE   16	/* don't leave any transactions running */
+
+void reiserfs_read_locked_inode(struct inode *inode,
+				struct reiserfs_iget_args *args);
+int reiserfs_find_actor(struct inode *inode, void *p);
+int reiserfs_init_locked_inode(struct inode *inode, void *p);
+void reiserfs_evict_inode(struct inode *inode);
+int reiserfs_write_inode(struct inode *inode, struct writeback_control *wbc);
+int reiserfs_get_block(struct inode *inode, sector_t block,
+		       struct buffer_head *bh_result, int create);
+struct dentry *reiserfs_fh_to_dentry(struct super_block *sb, struct fid *fid,
+				     int fh_len, int fh_type);
+struct dentry *reiserfs_fh_to_parent(struct super_block *sb, struct fid *fid,
+				     int fh_len, int fh_type);
+int reiserfs_encode_fh(struct dentry *dentry, __u32 * data, int *lenp,
+		       int connectable);
+
+int reiserfs_truncate_file(struct inode *, int update_timestamps);
+void make_cpu_key(struct cpu_key *cpu_key, struct inode *inode, loff_t offset,
+		  int type, int key_length);
+void make_le_item_head(struct item_head *ih, const struct cpu_key *key,
+		       int version,
+		       loff_t offset, int type, int length, int entry_count);
+struct inode *reiserfs_iget(struct super_block *s, const struct cpu_key *key);
+
+struct reiserfs_security_handle;
+int reiserfs_new_inode(struct reiserfs_transaction_handle *th,
+		       struct inode *dir, umode_t mode,
+		       const char *symname, loff_t i_size,
+		       struct dentry *dentry, struct inode *inode,
+		       struct reiserfs_security_handle *security);
+
+void reiserfs_update_sd_size(struct reiserfs_transaction_handle *th,
+			     struct inode *inode, loff_t size);
+
+static inline void reiserfs_update_sd(struct reiserfs_transaction_handle *th,
+				      struct inode *inode)
+{
+	reiserfs_update_sd_size(th, inode, inode->i_size);
+}
+
+void sd_attrs_to_i_attrs(__u16 sd_attrs, struct inode *inode);
+void i_attrs_to_sd_attrs(struct inode *inode, __u16 * sd_attrs);
+int reiserfs_setattr(struct dentry *dentry, struct iattr *attr);
+
+int __reiserfs_write_begin(struct page *page, unsigned from, unsigned len);
+
+/* namei.c */
+void set_de_name_and_namelen(struct reiserfs_dir_entry *de);
+int search_by_entry_key(struct super_block *sb, const struct cpu_key *key,
+			struct treepath *path, struct reiserfs_dir_entry *de);
+struct dentry *reiserfs_get_parent(struct dentry *);
+
+#ifdef CONFIG_REISERFS_PROC_INFO
+int reiserfs_proc_info_init(struct super_block *sb);
+int reiserfs_proc_info_done(struct super_block *sb);
+int reiserfs_proc_info_global_init(void);
+int reiserfs_proc_info_global_done(void);
+
+#define PROC_EXP( e )   e
+
+#define __PINFO( sb ) REISERFS_SB(sb) -> s_proc_info_data
+#define PROC_INFO_MAX( sb, field, value )								\
+    __PINFO( sb ).field =												\
+        max( REISERFS_SB( sb ) -> s_proc_info_data.field, value )
+#define PROC_INFO_INC( sb, field ) ( ++ ( __PINFO( sb ).field ) )
+#define PROC_INFO_ADD( sb, field, val ) ( __PINFO( sb ).field += ( val ) )
+#define PROC_INFO_BH_STAT( sb, bh, level )							\
+    PROC_INFO_INC( sb, sbk_read_at[ ( level ) ] );						\
+    PROC_INFO_ADD( sb, free_at[ ( level ) ], B_FREE_SPACE( bh ) );	\
+    PROC_INFO_ADD( sb, items_at[ ( level ) ], B_NR_ITEMS( bh ) )
+#else
+static inline int reiserfs_proc_info_init(struct super_block *sb)
+{
+	return 0;
+}
+
+static inline int reiserfs_proc_info_done(struct super_block *sb)
+{
+	return 0;
+}
+
+static inline int reiserfs_proc_info_global_init(void)
+{
+	return 0;
+}
+
+static inline int reiserfs_proc_info_global_done(void)
+{
+	return 0;
+}
+
+#define PROC_EXP( e )
+#define VOID_V ( ( void ) 0 )
+#define PROC_INFO_MAX( sb, field, value ) VOID_V
+#define PROC_INFO_INC( sb, field ) VOID_V
+#define PROC_INFO_ADD( sb, field, val ) VOID_V
+#define PROC_INFO_BH_STAT(sb, bh, n_node_level) VOID_V
+#endif
+
+/* dir.c */
+extern const struct inode_operations reiserfs_dir_inode_operations;
+extern const struct inode_operations reiserfs_symlink_inode_operations;
+extern const struct inode_operations reiserfs_special_inode_operations;
+extern const struct file_operations reiserfs_dir_operations;
+int reiserfs_readdir_dentry(struct dentry *, void *, filldir_t, loff_t *);
+
+/* tail_conversion.c */
+int direct2indirect(struct reiserfs_transaction_handle *, struct inode *,
+		    struct treepath *, struct buffer_head *, loff_t);
+int indirect2direct(struct reiserfs_transaction_handle *, struct inode *,
+		    struct page *, struct treepath *, const struct cpu_key *,
+		    loff_t, char *);
+void reiserfs_unmap_buffer(struct buffer_head *);
+
+/* file.c */
+extern const struct inode_operations reiserfs_file_inode_operations;
+extern const struct file_operations reiserfs_file_operations;
+extern const struct address_space_operations reiserfs_address_space_operations;
+
+/* fix_nodes.c */
+
+int fix_nodes(int n_op_mode, struct tree_balance *tb,
+	      struct item_head *ins_ih, const void *);
+void unfix_nodes(struct tree_balance *);
+
+/* prints.c */
+void __reiserfs_panic(struct super_block *s, const char *id,
+		      const char *function, const char *fmt, ...)
+    __attribute__ ((noreturn));
+#define reiserfs_panic(s, id, fmt, args...) \
+	__reiserfs_panic(s, id, __func__, fmt, ##args)
+void __reiserfs_error(struct super_block *s, const char *id,
+		      const char *function, const char *fmt, ...);
+#define reiserfs_error(s, id, fmt, args...) \
+	 __reiserfs_error(s, id, __func__, fmt, ##args)
+void reiserfs_info(struct super_block *s, const char *fmt, ...);
+void reiserfs_debug(struct super_block *s, int level, const char *fmt, ...);
+void print_indirect_item(struct buffer_head *bh, int item_num);
+void store_print_tb(struct tree_balance *tb);
+void print_cur_tb(char *mes);
+void print_de(struct reiserfs_dir_entry *de);
+void print_bi(struct buffer_info *bi, char *mes);
+#define PRINT_LEAF_ITEMS 1	/* print all items */
+#define PRINT_DIRECTORY_ITEMS 2	/* print directory items */
+#define PRINT_DIRECT_ITEMS 4	/* print contents of direct items */
+void print_block(struct buffer_head *bh, ...);
+void print_bmap(struct super_block *s, int silent);
+void print_bmap_block(int i, char *data, int size, int silent);
+/*void print_super_block (struct super_block * s, char * mes);*/
+void print_objectid_map(struct super_block *s);
+void print_block_head(struct buffer_head *bh, char *mes);
+void check_leaf(struct buffer_head *bh);
+void check_internal(struct buffer_head *bh);
+void print_statistics(struct super_block *s);
+char *reiserfs_hashname(int code);
+
+/* lbalance.c */
+int leaf_move_items(int shift_mode, struct tree_balance *tb, int mov_num,
+		    int mov_bytes, struct buffer_head *Snew);
+int leaf_shift_left(struct tree_balance *tb, int shift_num, int shift_bytes);
+int leaf_shift_right(struct tree_balance *tb, int shift_num, int shift_bytes);
+void leaf_delete_items(struct buffer_info *cur_bi, int last_first, int first,
+		       int del_num, int del_bytes);
+void leaf_insert_into_buf(struct buffer_info *bi, int before,
+			  struct item_head *inserted_item_ih,
+			  const char *inserted_item_body, int zeros_number);
+void leaf_paste_in_buffer(struct buffer_info *bi, int pasted_item_num,
+			  int pos_in_item, int paste_size, const char *body,
+			  int zeros_number);
+void leaf_cut_from_buffer(struct buffer_info *bi, int cut_item_num,
+			  int pos_in_item, int cut_size);
+void leaf_paste_entries(struct buffer_info *bi, int item_num, int before,
+			int new_entry_count, struct reiserfs_de_head *new_dehs,
+			const char *records, int paste_size);
+/* ibalance.c */
+int balance_internal(struct tree_balance *, int, int, struct item_head *,
+		     struct buffer_head **);
+
+/* do_balance.c */
+void do_balance_mark_leaf_dirty(struct tree_balance *tb,
+				struct buffer_head *bh, int flag);
+#define do_balance_mark_internal_dirty do_balance_mark_leaf_dirty
+#define do_balance_mark_sb_dirty do_balance_mark_leaf_dirty
+
+void do_balance(struct tree_balance *tb, struct item_head *ih,
+		const char *body, int flag);
+void reiserfs_invalidate_buffer(struct tree_balance *tb,
+				struct buffer_head *bh);
+
+int get_left_neighbor_position(struct tree_balance *tb, int h);
+int get_right_neighbor_position(struct tree_balance *tb, int h);
+void replace_key(struct tree_balance *tb, struct buffer_head *, int,
+		 struct buffer_head *, int);
+void make_empty_node(struct buffer_info *);
+struct buffer_head *get_FEB(struct tree_balance *);
+
+/* bitmap.c */
+
+/* structure contains hints for block allocator, and it is a container for
+ * arguments, such as node, search path, transaction_handle, etc. */
+struct __reiserfs_blocknr_hint {
+	struct inode *inode;	/* inode passed to allocator, if we allocate unf. nodes */
+	sector_t block;		/* file offset, in blocks */
+	struct in_core_key key;
+	struct treepath *path;	/* search path, used by allocator to deternine search_start by
+				 * various ways */
+	struct reiserfs_transaction_handle *th;	/* transaction handle is needed to log super blocks and
+						 * bitmap blocks changes  */
+	b_blocknr_t beg, end;
+	b_blocknr_t search_start;	/* a field used to transfer search start value (block number)
+					 * between different block allocator procedures
+					 * (determine_search_start() and others) */
+	int prealloc_size;	/* is set in determine_prealloc_size() function, used by underlayed
+				 * function that do actual allocation */
+
+	unsigned formatted_node:1;	/* the allocator uses different polices for getting disk space for
+					 * formatted/unformatted blocks with/without preallocation */
+	unsigned preallocate:1;
+};
+
+typedef struct __reiserfs_blocknr_hint reiserfs_blocknr_hint_t;
+
+int reiserfs_parse_alloc_options(struct super_block *, char *);
+void reiserfs_init_alloc_options(struct super_block *s);
+
+/*
+ * given a directory, this will tell you what packing locality
+ * to use for a new object underneat it.  The locality is returned
+ * in disk byte order (le).
+ */
+__le32 reiserfs_choose_packing(struct inode *dir);
+
+int reiserfs_init_bitmap_cache(struct super_block *sb);
+void reiserfs_free_bitmap_cache(struct super_block *sb);
+void reiserfs_cache_bitmap_metadata(struct super_block *sb, struct buffer_head *bh, struct reiserfs_bitmap_info *info);
+struct buffer_head *reiserfs_read_bitmap_block(struct super_block *sb, unsigned int bitmap);
+int is_reusable(struct super_block *s, b_blocknr_t block, int bit_value);
+void reiserfs_free_block(struct reiserfs_transaction_handle *th, struct inode *,
+			 b_blocknr_t, int for_unformatted);
+int reiserfs_allocate_blocknrs(reiserfs_blocknr_hint_t *, b_blocknr_t *, int,
+			       int);
+static inline int reiserfs_new_form_blocknrs(struct tree_balance *tb,
+					     b_blocknr_t * new_blocknrs,
+					     int amount_needed)
+{
+	reiserfs_blocknr_hint_t hint = {
+		.th = tb->transaction_handle,
+		.path = tb->tb_path,
+		.inode = NULL,
+		.key = tb->key,
+		.block = 0,
+		.formatted_node = 1
+	};
+	return reiserfs_allocate_blocknrs(&hint, new_blocknrs, amount_needed,
+					  0);
+}
+
+static inline int reiserfs_new_unf_blocknrs(struct reiserfs_transaction_handle
+					    *th, struct inode *inode,
+					    b_blocknr_t * new_blocknrs,
+					    struct treepath *path,
+					    sector_t block)
+{
+	reiserfs_blocknr_hint_t hint = {
+		.th = th,
+		.path = path,
+		.inode = inode,
+		.block = block,
+		.formatted_node = 0,
+		.preallocate = 0
+	};
+	return reiserfs_allocate_blocknrs(&hint, new_blocknrs, 1, 0);
+}
+
+#ifdef REISERFS_PREALLOCATE
+static inline int reiserfs_new_unf_blocknrs2(struct reiserfs_transaction_handle
+					     *th, struct inode *inode,
+					     b_blocknr_t * new_blocknrs,
+					     struct treepath *path,
+					     sector_t block)
+{
+	reiserfs_blocknr_hint_t hint = {
+		.th = th,
+		.path = path,
+		.inode = inode,
+		.block = block,
+		.formatted_node = 0,
+		.preallocate = 1
+	};
+	return reiserfs_allocate_blocknrs(&hint, new_blocknrs, 1, 0);
+}
+
+void reiserfs_discard_prealloc(struct reiserfs_transaction_handle *th,
+			       struct inode *inode);
+void reiserfs_discard_all_prealloc(struct reiserfs_transaction_handle *th);
+#endif
+
+/* hashes.c */
+__u32 keyed_hash(const signed char *msg, int len);
+__u32 yura_hash(const signed char *msg, int len);
+__u32 r5_hash(const signed char *msg, int len);
+
+#define reiserfs_set_le_bit		__set_bit_le
+#define reiserfs_test_and_set_le_bit	__test_and_set_bit_le
+#define reiserfs_clear_le_bit		__clear_bit_le
+#define reiserfs_test_and_clear_le_bit	__test_and_clear_bit_le
+#define reiserfs_test_le_bit		test_bit_le
+#define reiserfs_find_next_zero_le_bit	find_next_zero_bit_le
+
+/* sometimes reiserfs_truncate may require to allocate few new blocks
+   to perform indirect2direct conversion. People probably used to
+   think, that truncate should work without problems on a filesystem
+   without free disk space. They may complain that they can not
+   truncate due to lack of free disk space. This spare space allows us
+   to not worry about it. 500 is probably too much, but it should be
+   absolutely safe */
+#define SPARE_SPACE 500
+
+/* prototypes from ioctl.c */
+long reiserfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
+long reiserfs_compat_ioctl(struct file *filp,
+		   unsigned int cmd, unsigned long arg);
+int reiserfs_unpack(struct inode *inode, struct file *filp);