Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 2255 insertions, 0 deletions

diff --git a/include/linux/reiserfs_fs.h b/include/linux/reiserfs_fs.h
new file mode 100644
index 000000000000..bccff8b17dc4
--- /dev/null
+++ b/include/linux/reiserfs_fs.h
@@ -0,0 +1,2255 @@
+/*
+ * Copyright 1996, 1997, 1998 Hans Reiser, see reiserfs/README for licensing and copyright details
+ */
+
+                                /* this file has an amazingly stupid
+                                   name, yura please fix it to be
+                                   reiserfs.h, and merge all the rest
+                                   of our .h files that are in this
+                                   directory into it.  */
+
+
+#ifndef _LINUX_REISER_FS_H
+#define _LINUX_REISER_FS_H
+
+#include <linux/types.h>
+#ifdef __KERNEL__
+#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/smp_lock.h>
+#include <linux/buffer_head.h>
+#include <linux/reiserfs_fs_i.h>
+#include <linux/reiserfs_fs_sb.h>
+#endif
+
+/*
+ *  include/linux/reiser_fs.h
+ *
+ *  Reiser File System constants and structures
+ *
+ */
+
+/* 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 * fmt, ...);
+/* assertions handling */
+
+/** always check a condition and panic if it's false. */
+#define RASSERT( cond, format, args... )                                        \
+if( !( cond ) )                                                                 \
+  reiserfs_panic( NULL, "reiserfs[%i]: assertion " #cond " failed at "  \
+                  __FILE__ ":%i:%s: " format "\n",              \
+                  in_interrupt() ? -1 : current -> pid, __LINE__ , __FUNCTION__ , ##args )
+
+#if defined( CONFIG_REISERFS_CHECK )
+#define RFALSE( cond, format, args... ) RASSERT( !( 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 {
+    __u32 jp_journal_1st_block;       /* where does journal start from on its
+                                       * device */
+    __u32 jp_journal_dev;             /* journal device st_rdev */
+    __u32 jp_journal_size;            /* size of the journal */
+    __u32 jp_journal_trans_max;       /* max number of blocks in a transaction. */
+    __u32 jp_journal_magic;           /* random value made on fs creation (this
+                                       * was sb_journal_block_count) */
+    __u32 jp_journal_max_batch;       /* max number of blocks to batch into a
+                                       * trans */
+    __u32 jp_journal_max_commit_age;  /* in seconds, how old can an async
+                                       * commit be */
+    __u32 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
+{
+    __u32 s_block_count;           /* blocks count         */
+    __u32 s_free_blocks;           /* free blocks count    */
+    __u32 s_root_block;            /* root block number    */
+    struct journal_params s_journal;
+    __u16 s_blocksize;             /* block size */
+    __u16 s_oid_maxsize;           /* max size of object id array, see
+                                    * get_objectid() commentary  */
+    __u16 s_oid_cursize;           /* current size of object id array */
+    __u16 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" */
+    __u16 s_fs_state;              /* it is set to used by fsck to mark which
+                                    * phase of rebuilding is done */
+    __u32 s_hash_function_code;    /* indicate, what hash function is being use
+                                    * to sort names in a directory*/
+    __u16 s_tree_height;           /* height of disk tree */
+    __u16 s_bmap_nr;               /* amount of bitmap blocks needed to address
+                                    * each block of file system */
+    __u16 s_version;               /* this field is only reliable on filesystem
+                                    * with non-standard journal */
+    __u16 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;
+    __u32 s_inode_generation;
+    __u32 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 */
+    char s_unused[88] ;             /* 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) \
+         le32_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))) 
+
+
+
+                                /* used by gcc */
+#define REISERFS_SUPER_MAGIC 0x52654973
+                                /* used by file system utilities that
+                                   look at the superblock, etc. */
+#define REISERFS_SUPER_MAGIC_STRING "ReIsErFs"
+#define REISER2FS_SUPER_MAGIC_STRING "ReIsEr2Fs"
+#define REISER2FS_JR_SUPER_MAGIC_STRING "ReIsEr3Fs"
+
+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 adn 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 __u32 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;
+}
+
+/** 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 {
+    __u32 k_offset;
+    __u32 k_uniqueness;
+} __attribute__ ((__packed__));
+
+struct offset_v2 {
+#ifdef __LITTLE_ENDIAN
+            /* little endian version */
+            __u64 k_offset:60;
+            __u64 k_type: 4;
+#else
+            /* big endian version */
+            __u64 k_type: 4;
+            __u64 k_offset:60;
+#endif
+} __attribute__ ((__packed__));
+
+#ifndef __LITTLE_ENDIAN
+typedef union {
+    struct offset_v2 offset_v2;
+    __u64 linear;
+} __attribute__ ((__packed__)) offset_v2_esafe_overlay;
+
+static inline __u16 offset_v2_k_type( const struct offset_v2 *v2 )
+{
+    offset_v2_esafe_overlay tmp = *(const offset_v2_esafe_overlay *)v2;
+    tmp.linear = le64_to_cpu( tmp.linear );
+    return (tmp.offset_v2.k_type <= TYPE_MAXTYPE)?tmp.offset_v2.k_type:TYPE_ANY;
+}
+ 
+static inline void set_offset_v2_k_type( struct offset_v2 *v2, int type )
+{
+    offset_v2_esafe_overlay *tmp = (offset_v2_esafe_overlay *)v2;
+    tmp->linear = le64_to_cpu(tmp->linear);
+    tmp->offset_v2.k_type = type;
+    tmp->linear = cpu_to_le64(tmp->linear);
+}
+ 
+static inline loff_t offset_v2_k_offset( const struct offset_v2 *v2 )
+{
+    offset_v2_esafe_overlay tmp = *(const offset_v2_esafe_overlay *)v2;
+    tmp.linear = le64_to_cpu( tmp.linear );
+    return tmp.offset_v2.k_offset;
+}
+
+static inline void set_offset_v2_k_offset( struct offset_v2 *v2, loff_t offset ){
+    offset_v2_esafe_overlay *tmp = (offset_v2_esafe_overlay *)v2;
+    tmp->linear = le64_to_cpu(tmp->linear);
+    tmp->offset_v2.k_offset = offset;
+    tmp->linear = cpu_to_le64(tmp->linear);
+}
+#else
+# define offset_v2_k_type(v2)           ((v2)->k_type)
+# define set_offset_v2_k_type(v2,val)   (offset_v2_k_type(v2) = (val))
+# define offset_v2_k_offset(v2)         ((v2)->k_offset)
+# define set_offset_v2_k_offset(v2,val) (offset_v2_k_offset(v2) = (val))
+#endif
+
+/* Key of an item determines its location in the S+tree, and
+   is composed of 4 components */
+struct reiserfs_key {
+    __u32 k_dir_id;    /* packing locality: by default parent
+                          directory object id */
+    __u32 k_objectid;  /* object identifier */
+    union {
+        struct offset_v1 k_offset_v1;
+        struct offset_v2 k_offset_v2;
+    } __attribute__ ((__packed__)) u;
+} __attribute__ ((__packed__));
+
+
+struct cpu_key {
+    struct reiserfs_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. */
+                __u16 ih_free_space_reserved; 
+                /* Iff this is a directory item, this field equals the
+                   number of directory entries in the directory item. */
+                __u16 ih_entry_count; 
+        } __attribute__ ((__packed__)) u;
+        __u16 ih_item_len;           /* total size of the item body */
+        __u16 ih_item_location;      /* an offset to the item body
+                                      * within the block */
+        __u16 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) le32_to_cpu(get_unaligned((p) + (i)))
+#define put_block_num(p, i, v) put_unaligned(cpu_to_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;
+    default:
+            reiserfs_warning (NULL, "vs-500: unknown uniqueness %d",
+                              uniqueness);
+        case V1_ANY_UNIQUENESS:
+            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;
+    default:
+            reiserfs_warning (NULL, "vs-501: unknown type %d", type);
+        case TYPE_ANY:
+            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);
+}
+
+
+#define is_direntry_le_key(version,key) (le_key_k_type (version, key) == TYPE_DIRENTRY)
+#define is_direct_le_key(version,key) (le_key_k_type (version, key) == TYPE_DIRECT)
+#define is_indirect_le_key(version,key) (le_key_k_type (version, key) == TYPE_INDIRECT)
+#define is_statdata_le_key(version,key) (le_key_k_type (version, key) == TYPE_STAT_DATA)
+
+//
+// item header has version.
+//
+#define is_direntry_le_ih(ih) is_direntry_le_key (ih_version (ih), &((ih)->ih_key))
+#define is_direct_le_ih(ih) is_direct_le_key (ih_version (ih), &((ih)->ih_key))
+#define is_indirect_le_ih(ih) is_indirect_le_key (ih_version(ih), &((ih)->ih_key))
+#define is_statdata_le_ih(ih) 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->version == KEY_FORMAT_3_5) ?
+        key->on_disk_key.u.k_offset_v1.k_offset :
+        key->on_disk_key.u.k_offset_v2.k_offset;
+}
+
+static inline loff_t cpu_key_k_type (const struct cpu_key * key)
+{
+    return (key->version == KEY_FORMAT_3_5) ?
+        uniqueness2type (key->on_disk_key.u.k_offset_v1.k_uniqueness) :
+        key->on_disk_key.u.k_offset_v2.k_type;
+}
+
+static inline void set_cpu_key_k_offset (struct cpu_key * key, loff_t offset)
+{
+    (key->version == KEY_FORMAT_3_5) ?
+        (key->on_disk_key.u.k_offset_v1.k_offset = offset) :
+        (key->on_disk_key.u.k_offset_v2.k_offset = offset);
+}
+
+
+static inline void set_cpu_key_k_type (struct cpu_key * key, int type)
+{
+    (key->version == KEY_FORMAT_3_5) ?
+        (key->on_disk_key.u.k_offset_v1.k_uniqueness = type2uniqueness (type)):
+        (key->on_disk_key.u.k_offset_v2.k_type = type);
+}
+
+
+static inline void cpu_key_k_offset_dec (struct cpu_key * key)
+{
+    if (key->version == KEY_FORMAT_3_5)
+        key->on_disk_key.u.k_offset_v1.k_offset --;
+    else
+        key->on_disk_key.u.k_offset_v2.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(p_s_ih, p_s_key, n_blocksize) \
+    ( ! COMP_SHORT_KEYS(p_s_ih, p_s_key) && \
+          I_OFF_BYTE_IN_ITEM(p_s_ih, k_offset (p_s_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 {       
+  __u16 blk_level;        /* Level of a block in the tree. */
+  __u16 blk_nr_item;      /* Number of keys/items in a block. */
+  __u16 blk_free_space;   /* Block free space in bytes. */
+  __u16 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(p_s_bh)            ((struct block_head *)((p_s_bh)->b_data))
+/* Number of items that are in buffer. */
+#define B_NR_ITEMS(p_s_bh)            (blkh_nr_item(B_BLK_HEAD(p_s_bh)))
+#define B_LEVEL(p_s_bh)               (blkh_level(B_BLK_HEAD(p_s_bh)))
+#define B_FREE_SPACE(p_s_bh)          (blkh_free_space(B_BLK_HEAD(p_s_bh)))
+
+#define PUT_B_NR_ITEMS(p_s_bh,val)    do { set_blkh_nr_item(B_BLK_HEAD(p_s_bh),val); } while (0)
+#define PUT_B_LEVEL(p_s_bh,val)       do { set_blkh_level(B_BLK_HEAD(p_s_bh),val); } while (0)
+#define PUT_B_FREE_SPACE(p_s_bh,val)  do { set_blkh_free_space(B_BLK_HEAD(p_s_bh),val); } while (0)
+
+
+/* Get right delimiting key. -- little endian */
+#define B_PRIGHT_DELIM_KEY(p_s_bh)   (&(blk_right_delim_key(B_BLK_HEAD(p_s_bh))
+
+/* Does the buffer contain a disk leaf. */
+#define B_IS_ITEMS_LEVEL(p_s_bh)     (B_LEVEL(p_s_bh) == DISK_LEAF_NODE_LEVEL)
+
+/* Does the buffer contain a disk internal node */
+#define B_IS_KEYS_LEVEL(p_s_bh)      (B_LEVEL(p_s_bh) > DISK_LEAF_NODE_LEVEL \
+                                            && B_LEVEL(p_s_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
+{
+    __u16 sd_mode;      /* file type, permissions */
+    __u16 sd_nlink;     /* number of hard links */
+    __u16 sd_uid;               /* owner */
+    __u16 sd_gid;               /* group */
+    __u32 sd_size;      /* file size */
+    __u32 sd_atime;     /* time of last access */
+    __u32 sd_mtime;     /* time file was last modified  */
+    __u32 sd_ctime;     /* time inode (stat data) was last changed (except changes to sd_atime and sd_mtime) */
+    union {
+        __u32 sd_rdev;
+        __u32 sd_blocks;        /* number of blocks file uses */
+    } __attribute__ ((__packed__)) u;
+    __u32 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))
+
+#include <linux/ext2_fs.h>
+
+/* 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 EXT2_IMMUTABLE_FL
+#define REISERFS_APPEND_FL    EXT2_APPEND_FL
+#define REISERFS_SYNC_FL      EXT2_SYNC_FL
+#define REISERFS_NOATIME_FL   EXT2_NOATIME_FL
+#define REISERFS_NODUMP_FL    EXT2_NODUMP_FL
+#define REISERFS_SECRM_FL     EXT2_SECRM_FL
+#define REISERFS_UNRM_FL      EXT2_UNRM_FL
+#define REISERFS_COMPR_FL     EXT2_COMPR_FL
+#define REISERFS_NOTAIL_FL    EXT2_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 {
+    __u16 sd_mode;      /* file type, permissions */
+    __u16 sd_attrs;     /* persistent inode flags */
+    __u32 sd_nlink;     /* number of hard links */
+    __u64 sd_size;      /* file size */
+    __u32 sd_uid;               /* owner */
+    __u32 sd_gid;               /* group */
+    __u32 sd_atime;     /* time of last access */
+    __u32 sd_mtime;     /* time file was last modified  */
+    __u32 sd_ctime;     /* time inode (stat data) was last changed (except changes to sd_atime and sd_mtime) */
+    __u32 sd_blocks;
+    union {
+        __u32 sd_rdev;
+        __u32 sd_generation;
+      //__u32 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
+{
+  __u32 deh_offset;             /* third component of the directory entry key */
+  __u32 deh_dir_id;             /* objectid of the parent directory of the object, that is referenced
+                                           by directory entry */
+  __u32 deh_objectid;           /* objectid of the object, that is referenced by directory entry */
+  __u16 deh_location;           /* offset of name in the whole item */
+  __u16 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)     ext2_set_bit((nr) + unaligned_offset(addr), aligned_address(addr))
+#   define clear_bit_unaligned(nr, addr)   ext2_clear_bit((nr) + unaligned_offset(addr), aligned_address(addr))
+#   define test_bit_unaligned(nr, addr)    ext2_test_bit((nr) + unaligned_offset(addr), aligned_address(addr))
+
+#else
+
+#   define set_bit_unaligned(nr, addr)     ext2_set_bit(nr, addr)
+#   define clear_bit_unaligned(nr, addr)   ext2_clear_bit(nr, addr)
+#   define test_bit_unaligned(nr, addr)    ext2_test_bit(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, __u32 dirid, __u32 objid,
+                                    __u32 par_dirid, __u32 par_objid);
+extern void make_empty_dir_item (char * body, __u32 dirid, __u32 objid,
+                                 __u32 par_dirid, __u32 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;
+  char * 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 {
+  __u32       dc_block_number;              /* Disk child's block number. */
+  __u16       dc_size;                      /* Disk child's used space.   */
+  __u16       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(p_s_bh,n_pos)  ((struct disk_child *)\
+((p_s_bh)->b_data+BLKH_SIZE+B_NR_ITEMS(p_s_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(p_s_bh,n_pos) (dc_block_number(B_N_CHILD(p_s_bh,n_pos)))
+#define PUT_B_N_CHILD_NUM(p_s_bh,n_pos, val) (put_dc_block_number(B_N_CHILD(p_s_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  path {
+  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 path var = {.path_length = ILLEGAL_PATH_ELEMENT_OFFSET, .reada = 0,}
+
+/* Get path element by path and path position. */
+#define PATH_OFFSET_PELEMENT(p_s_path,n_offset)  ((p_s_path)->path_elements +(n_offset))
+
+/* Get buffer header at the path by path and path position. */
+#define PATH_OFFSET_PBUFFER(p_s_path,n_offset)   (PATH_OFFSET_PELEMENT(p_s_path,n_offset)->pe_buffer)
+
+/* Get position in the element at the path by path and path position. */
+#define PATH_OFFSET_POSITION(p_s_path,n_offset) (PATH_OFFSET_PELEMENT(p_s_path,n_offset)->pe_position)
+
+
+#define PATH_PLAST_BUFFER(p_s_path) (PATH_OFFSET_PBUFFER((p_s_path), (p_s_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(p_s_path) (PATH_OFFSET_POSITION((p_s_path), (p_s_path)->path_length))
+
+
+#define PATH_PITEM_HEAD(p_s_path)    B_N_PITEM_HEAD(PATH_PLAST_BUFFER(p_s_path),PATH_LAST_POSITION(p_s_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(p_s_path, h) PATH_OFFSET_PBUFFER (p_s_path, p_s_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(p_s_path, n_h) ((p_s_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) ({cond_resched(); __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 path * 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 reiserfs_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
+   existant 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;
+};
+
+
+/* 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(p_s_ih)      ( ih_item_len(p_s_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                                */
+/***************************************************************************/
+
+/*#ifdef __KERNEL__*/
+#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 {
+  __u32 j_trans_id ;                    /* id of commit */
+  __u32 j_len ;                 /* length of commit. len +1 is the commit block */
+  __u32 j_mount_id ;                            /* mount id of this trans*/
+  __u32 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 {
+  __u32 j_trans_id ;                    /* must match j_trans_id from the desc block */
+  __u32 j_len ;                 /* ditto */
+  __u32 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 {
+  __u32 j_last_flush_trans_id ;         /* id of last fully flushed transaction */
+  __u32 j_first_unflushed_offset ;      /* offset in the log of where to start replay after a crash */
+  __u32 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)
+#ifdef CONFIG_QUOTA
+#define REISERFS_QUOTA_TRANS_BLOCKS 2   /* We need to update data and inode (atime) */
+#define REISERFS_QUOTA_INIT_BLOCKS (DQUOT_MAX_WRITES*(JOURNAL_PER_BALANCE_CNT+2)+1)     /* 1 balancing, 1 bitmap, 1 data per write + stat data update */
+#else
+#define REISERFS_QUOTA_TRANS_BLOCKS 0
+#define REISERFS_QUOTA_INIT_BLOCKS 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 long 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 ;
+}
+
+int reiserfs_async_progress_wait(struct super_block *s);
+
+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 *p_s_sb, int bmap_nr, int bit_nr, int searchall, b_blocknr_t *next) ;
+int journal_begin(struct reiserfs_transaction_handle *, struct super_block *p_s_sb, unsigned long) ;
+int journal_join_abort(struct reiserfs_transaction_handle *, struct super_block *p_s_sb, unsigned long) ;
+void reiserfs_journal_abort (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 *, 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 * p_v_to,
+                                                                  const struct item_head * p_v_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 path * p_s_path);
+const struct reiserfs_key * get_rkey (const struct path * p_s_chk_path,
+                                                         const struct super_block  * p_s_sb);
+int search_by_key (struct super_block *, const struct cpu_key *, 
+                                   struct path *, 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 * p_s_sb, 
+                                                                const struct cpu_key * p_s_cpu_key, 
+                                                                struct path * p_s_search_path);
+extern void decrement_bcount (struct buffer_head * p_s_bh);
+void decrement_counters_in_path (struct path * p_s_search_path);
+void pathrelse (struct path * p_s_search_path);
+int reiserfs_check_path(struct path *p) ;
+void pathrelse_and_restore (struct super_block *s, struct path * p_s_search_path);
+
+int reiserfs_insert_item (struct reiserfs_transaction_handle *th, 
+                          struct path * 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 path * 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 path * 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 path * path, 
+                          const struct cpu_key * key,
+                          struct inode * inode, 
+                          struct buffer_head  * p_s_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 * p_s_inode);
+int reiserfs_do_truncate (struct reiserfs_transaction_handle *th,
+                           struct  inode * p_s_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_ISEM     8 /* i_sem is not held, don't preallocate */
+#define GET_BLOCK_NO_DANGLE   16 /* don't leave any transactions running */
+
+int restart_transaction(struct reiserfs_transaction_handle *th, struct inode *inode, struct path *path);
+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_delete_inode (struct inode * inode);
+int reiserfs_write_inode (struct inode * inode, int) ;
+int reiserfs_get_block (struct inode * inode, sector_t block, struct buffer_head * bh_result, int create);
+struct dentry *reiserfs_get_dentry(struct super_block *, void *) ;
+struct dentry *reiserfs_decode_fh(struct super_block *sb, __u32 *data,
+                                     int len, int fhtype,
+                                  int (*acceptable)(void *contect, struct dentry *de),
+                                  void *context) ;
+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);
+
+
+int reiserfs_new_inode (struct reiserfs_transaction_handle *th, 
+                                   struct inode * dir, int mode, 
+                                   const char * symname, loff_t i_size,
+                                   struct dentry *dentry, struct inode *inode);
+
+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);
+
+/* 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 path * path, 
+                         struct reiserfs_dir_entry * de);
+struct dentry *reiserfs_get_parent(struct dentry *) ;
+/* procfs.c */
+
+#if defined( CONFIG_PROC_FS ) && defined( CONFIG_REISERFS_PROC_INFO )
+#define REISERFS_PROC_INFO
+#else
+#undef REISERFS_PROC_INFO
+#endif
+
+int reiserfs_proc_info_init( struct super_block *sb );
+int reiserfs_proc_info_done( struct super_block *sb );
+struct proc_dir_entry *reiserfs_proc_register_global( char *name, 
+                                                                                                          read_proc_t *func );
+void reiserfs_proc_unregister_global( const char *name );
+int reiserfs_proc_info_global_init( void );
+int reiserfs_proc_info_global_done( void );
+int reiserfs_global_version_in_proc( char *buffer, char **start, off_t offset,
+                                                                         int count, int *eof, void *data );
+
+#if defined( REISERFS_PROC_INFO )
+
+#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
+#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( p_s_sb, p_s_bh, n_node_level ) VOID_V
+#endif
+
+/* dir.c */
+extern struct inode_operations reiserfs_dir_inode_operations;
+extern struct inode_operations reiserfs_symlink_inode_operations;
+extern struct inode_operations reiserfs_special_inode_operations;
+extern struct file_operations reiserfs_dir_operations;
+
+/* tail_conversion.c */
+int direct2indirect (struct reiserfs_transaction_handle *, struct inode *, struct path *, struct buffer_head *, loff_t);
+int indirect2direct (struct reiserfs_transaction_handle *, struct inode *, struct page *, struct path *, const struct cpu_key *, loff_t, char *);
+void reiserfs_unmap_buffer(struct buffer_head *) ;
+
+
+/* file.c */
+extern struct inode_operations reiserfs_file_inode_operations;
+extern struct file_operations reiserfs_file_operations;
+extern struct address_space_operations reiserfs_address_space_operations ;
+
+/* fix_nodes.c */
+#ifdef CONFIG_REISERFS_CHECK
+void * reiserfs_kmalloc (size_t size, int flags, struct super_block * s);
+void reiserfs_kfree (const void * vp, size_t size, struct super_block * s);
+#else
+static inline void *reiserfs_kmalloc(size_t size, int flags,
+                                        struct super_block *s)
+{
+        return kmalloc(size, flags);
+}
+
+static inline void reiserfs_kfree(const void *vp, size_t size,
+                                        struct super_block *s)
+{
+        kfree(vp);
+}
+#endif
+
+int fix_nodes (int n_op_mode, struct tree_balance * p_s_tb, 
+               struct item_head * p_s_ins_ih, const void *);
+void unfix_nodes (struct tree_balance *);
+
+
+/* prints.c */
+void reiserfs_panic (struct super_block * s, const char * fmt, ...) __attribute__ ( ( noreturn ) );
+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_head * bh, 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 */
+     long block;                        /* file offset, in blocks */
+     struct reiserfs_key key;
+     struct path * 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).
+ */
+u32 reiserfs_choose_packing(struct inode *dir);
+
+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);
+extern 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);
+}
+
+extern inline int reiserfs_new_unf_blocknrs (struct reiserfs_transaction_handle *th,
+                                             struct inode *inode,
+                                             b_blocknr_t *new_blocknrs,
+                                             struct path * path, long 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
+extern inline int reiserfs_new_unf_blocknrs2(struct reiserfs_transaction_handle *th,
+                                             struct inode * inode,
+                                             b_blocknr_t *new_blocknrs,
+                                             struct path * path, long 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
+void reiserfs_claim_blocks_to_be_allocated( struct super_block *sb, int blocks);
+void reiserfs_release_claimed_blocks( struct super_block *sb, int blocks);
+int reiserfs_can_fit_pages(struct super_block *sb);
+
+/* 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);
+
+/* the ext2 bit routines adjust for big or little endian as
+** appropriate for the arch, so in our laziness we use them rather
+** than using the bit routines they call more directly.  These
+** routines must be used when changing on disk bitmaps.  */
+#define reiserfs_test_and_set_le_bit   ext2_set_bit
+#define reiserfs_test_and_clear_le_bit ext2_clear_bit
+#define reiserfs_test_le_bit           ext2_test_bit
+#define reiserfs_find_next_zero_le_bit ext2_find_next_zero_bit
+
+/* 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 */
+int reiserfs_ioctl (struct inode * inode, struct file * filp, 
+                    unsigned int cmd, unsigned long arg);
+ 
+/* ioctl's command */
+#define REISERFS_IOC_UNPACK             _IOW(0xCD,1,long)
+/* define following flags to be the same as in ext2, so that chattr(1),
+   lsattr(1) will work with us. */
+#define REISERFS_IOC_GETFLAGS           EXT2_IOC_GETFLAGS
+#define REISERFS_IOC_SETFLAGS           EXT2_IOC_SETFLAGS
+#define REISERFS_IOC_GETVERSION         EXT2_IOC_GETVERSION
+#define REISERFS_IOC_SETVERSION         EXT2_IOC_SETVERSION
+
+/* Locking primitives */
+/* Right now we are still falling back to (un)lock_kernel, but eventually that
+   would evolve into real per-fs locks */
+#define reiserfs_write_lock( sb ) lock_kernel()
+#define reiserfs_write_unlock( sb ) unlock_kernel()
+                                 
+/* xattr stuff */
+#define REISERFS_XATTR_DIR_SEM(s) (REISERFS_SB(s)->xattr_dir_sem)
+
+#endif /* _LINUX_REISER_FS_H */
+
+