Merge with Linux 2.4.1.

1 files changed, 2074 insertions, 0 deletions

diff --git a/include/linux/reiserfs_fs.h b/include/linux/reiserfs_fs.h
new file mode 100644
index 000000000..277281d6d
--- /dev/null
+++ b/include/linux/reiserfs_fs.h
@@ -0,0 +1,2074 @@
+/*
+ * 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/malloc.h>
+#include <linux/tqueue.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.
+
+*/
+
+				/* Vladimir, what is the story with
+                                   new_get_new_buffer nowadays?  I
+                                   want a complete explanation written
+                                   here. */
+
+/* NEW_GET_NEW_BUFFER will try to allocate new blocks better */
+/*#define NEW_GET_NEW_BUFFER*/
+#define OLD_GET_NEW_BUFFER
+
+				/* Vladimir, what about this one too? */
+/* if this is undefined, all inode changes get into stat data immediately, if it can be found in RAM */
+#define DIRTY_LATER
+
+/* enable journalling */
+#define ENABLE_JOURNAL
+
+#ifdef __KERNEL__
+
+/* #define REISERFS_CHECK */
+
+#define REISERFS_PREALLOCATE
+#endif
+#define PREALLOCATION_SIZE 8
+
+/* if this is undefined, all inode changes get into stat data
+   immediately, if it can be found in RAM */
+#define DIRTY_LATER
+
+
+/*#define READ_LOCK_REISERFS*/
+
+
+/* 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
+				/* what 4? -Hans */
+#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 */ 
+
+/*
+ * Disk Data Structures
+ */
+
+/***************************************************************************/
+/*                             SUPER BLOCK                                 */
+/***************************************************************************/
+
+/*
+ * Structure of super block on disk, a version of which in RAM is often accessed as s->u.reiserfs_sb.s_rs
+ * the version in RAM is part of a larger structure containing fields never written to disk.
+ */
+
+				/* 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"
+
+extern inline int is_reiserfs_magic_string (struct reiserfs_super_block * rs)
+{
+    return (!strncmp (rs->s_magic, REISERFS_SUPER_MAGIC_STRING, 
+		      strlen ( REISERFS_SUPER_MAGIC_STRING)) ||
+	    !strncmp (rs->s_magic, REISER2FS_SUPER_MAGIC_STRING, 
+		      strlen ( REISER2FS_SUPER_MAGIC_STRING)));
+}
+
+				/* 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
+
+/* 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 SCHEDULE_OCCURRED  	1
+//#define PATH_INCORRECT    	2
+
+//#define NO_DISK_SPACE        (-1)
+
+
+
+typedef unsigned long b_blocknr_t;
+typedef __u32 unp_t;
+
+				/* who is responsible for this
+                                   completely uncommented struct? */
+struct unfm_nodeinfo {
+				/* This is what? */
+    unp_t unfm_nodenum;
+				/* now this I know what it is, and
+                                   most of the people on our project
+                                   know what it is, but I bet nobody
+                                   new I hire will have a clue. */
+    unsigned short unfm_freespace;
+};
+
+
+/* when reiserfs_file_write is called with a byte count >= MIN_PACK_ON_CLOSE,
+** it sets the inode to pack on close, and when extending the file, will only
+** use unformatted nodes.
+**
+** This is a big speed up for the journal, which is badly hurt by direct->indirect
+** conversions (they must be logged).
+*/
+#define MIN_PACK_ON_CLOSE		512
+
+/* the defines below say, that if file size is >=
+   DIRECT_TAIL_SUPPRESSION_SIZE * blocksize, then if tail is longer
+   than MAX_BYTES_SUPPRESS_DIRECT_TAIL, it will be stored in
+   unformatted node */
+#define DIRECT_TAIL_SUPPRESSION_SIZE      1024
+#define MAX_BYTES_SUPPRESS_DIRECT_TAIL    1024
+
+#if 0
+
+//
+#define mark_file_with_tail(inode,offset) \
+{\
+inode->u.reiserfs_i.i_has_tail = 1;\
+}
+
+#define mark_file_without_tail(inode) \
+{\
+inode->u.reiserfs_i.i_has_tail = 0;\
+}
+
+#endif
+
+// this says about version of all items (but stat data) the object
+// consists of
+#define inode_items_version(inode) ((inode)->u.reiserfs_i.i_version)
+
+
+/* We store tail in unformatted node if it is too big to fit into a
+   formatted node or if DIRECT_TAIL_SUPPRESSION_SIZE,
+   MAX_BYTES_SUPPRESS_DIRECT_TAIL and file size say that. */
+/* #define STORE_TAIL_IN_UNFM(n_file_size,n_tail_size,n_block_size) \ */
+/* ( ((n_tail_size) > MAX_DIRECT_ITEM_LEN(n_block_size)) || \ */
+/*   ( ( (n_file_size) >= (n_block_size) * DIRECT_TAIL_SUPPRESSION_SIZE ) && \ */
+/*    ( (n_tail_size) >= MAX_BYTES_SUPPRESS_DIRECT_TAIL ) ) ) */
+
+  /* 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(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) ) ) \
+)
+
+
+/*
+ * values for s_state field
+ */
+#define REISERFS_VALID_FS    1
+#define REISERFS_ERROR_FS    2
+
+
+
+/***************************************************************************/
+/*                       KEY & ITEM HEAD                                   */
+/***************************************************************************/
+
+//
+// we do support for old format of reiserfs: the problem is to
+// distinuquish keys with 32 bit offset and keys with 60 bit ones. On
+// leaf level we use ih_version of struct item_head (was
+// ih_reserved). For all old items it is set to 0
+// (ITEM_VERSION_1). For new items it is ITEM_VERSION_2. On internal
+// levels we have to know version of item key belongs to.
+//
+#define ITEM_VERSION_1 0
+#define ITEM_VERSION_2 1
+
+
+/* loff_t - long long */
+
+
+//
+// directories use this key as well as old files
+//
+struct offset_v1 {
+    __u32 k_offset;
+    __u32 k_uniqueness;
+} __attribute__ ((__packed__));
+
+struct offset_v2 {
+    __u64 k_offset:60;
+    __u64 k_type: 4;
+} __attribute__ ((__packed__));
+
+
+
+/* Key of an item determines its location in the S+tree, and
+   is composed of 4 components */
+struct 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 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 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
+{
+  struct key ih_key; 	/* Everything in the tree is found by searching for it based on its key.*/
+
+				/* This is bloat, this should be part
+                                   of the item not the item
+                                   header. -Hans */
+  union {
+    __u16 ih_free_space_reserved; /* 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_entry_count; /* Iff this is a directory item, this field equals the number of directory
+				      entries in the directory item. */
+  } __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  */
+				/* I thought we were going to use this
+                                   for having lots of item types? Why
+                                   don't you use this for item type
+                                   not item version.  That is how you
+                                   talked me into this field a year
+                                   ago, remember?  I am still not
+                                   convinced it needs to be 16 bits
+                                   (for at least many years), but at
+                                   least I can sympathize with that
+                                   hope. Change the name from version
+                                   to type, and tell people not to use
+                                   FFFF in case 16 bits is someday too
+                                   small and needs to be extended:-). */
+  __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)
+
+
+// FIXME: now would that work for other than i386 archs
+#define unreachable_item(ih) (ih->ih_version & (1 << 15))
+
+#define get_ih_free_space(ih) (ih_version (ih) == ITEM_VERSION_2 ? 0 : ih_free_space (ih))
+#define set_ih_free_space(ih,val) put_ih_free_space((ih), ((ih_version(ih) == ITEM_VERSION_2) ? 0 : (val)))
+
+
+//
+// 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_ANY 15 // FIXME: comment is required
+
+//
+// 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
+//
+extern inline int uniqueness2type (__u32 uniqueness)
+{
+    switch (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;
+    }
+/*
+    if (uniqueness != V1_ANY_UNIQUENESS) {
+	printk ("uniqueness %d\n", uniqueness);
+	BUG (); 
+    }
+*/
+    return TYPE_ANY;
+}
+
+extern 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;
+    }
+    /*
+    if (type != TYPE_ANY)
+	BUG ();
+    */
+    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
+//
+extern inline loff_t le_key_k_offset (int version, struct key * key)
+{
+    return (version == ITEM_VERSION_1) ? key->u.k_offset_v1.k_offset :
+	le64_to_cpu (key->u.k_offset_v2.k_offset);
+}
+extern inline loff_t le_ih_k_offset (struct item_head * ih)
+{
+    return le_key_k_offset (ih_version (ih), &(ih->ih_key));
+}
+
+
+extern inline loff_t le_key_k_type (int version, struct key * key)
+{
+    return (version == ITEM_VERSION_1) ? uniqueness2type (key->u.k_offset_v1.k_uniqueness) :
+	le16_to_cpu (key->u.k_offset_v2.k_type);
+}
+extern inline loff_t le_ih_k_type (struct item_head * ih)
+{
+    return le_key_k_type (ih_version (ih), &(ih->ih_key));
+}
+
+
+extern inline void set_le_key_k_offset (int version, struct key * key, loff_t offset)
+{
+    (version == ITEM_VERSION_1) ? (key->u.k_offset_v1.k_offset = offset) :
+	(key->u.k_offset_v2.k_offset = cpu_to_le64 (offset));
+}
+extern 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);
+}
+
+
+
+extern inline void set_le_key_k_type (int version, struct key * key, int type)
+{
+    (version == ITEM_VERSION_1) ? (key->u.k_offset_v1.k_uniqueness = type2uniqueness (type)) :
+	(key->u.k_offset_v2.k_type = cpu_to_le16 (type));
+}
+extern 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
+//
+extern inline loff_t cpu_key_k_offset (struct cpu_key * key)
+{
+    return (key->version == ITEM_VERSION_1) ? key->on_disk_key.u.k_offset_v1.k_offset :
+	key->on_disk_key.u.k_offset_v2.k_offset;
+}
+
+extern inline loff_t cpu_key_k_type (struct cpu_key * key)
+{
+    return (key->version == ITEM_VERSION_1) ? uniqueness2type (key->on_disk_key.u.k_offset_v1.k_uniqueness) :
+	key->on_disk_key.u.k_offset_v2.k_type;
+}
+
+extern inline void set_cpu_key_k_offset (struct cpu_key * key, loff_t offset)
+{
+    (key->version == ITEM_VERSION_1) ? (key->on_disk_key.u.k_offset_v1.k_offset = offset) :
+	(key->on_disk_key.u.k_offset_v2.k_offset = offset);
+}
+
+
+extern inline void set_cpu_key_k_type (struct cpu_key * key, int type)
+{
+    (key->version == ITEM_VERSION_1) ? (key->on_disk_key.u.k_offset_v1.k_uniqueness = type2uniqueness (type)) :
+	(key->on_disk_key.u.k_offset_v2.k_type = type);
+}
+
+extern inline void cpu_key_k_offset_dec (struct cpu_key * key)
+{
+    if (key->version == ITEM_VERSION_1)
+	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 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 key  blk_right_delim_key; /* kept only for compatibility */
+};
+
+#define BLKH_SIZE (sizeof(struct block_head))
+
+/*
+ * 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)	  	(le16_to_cpu ( B_BLK_HEAD(p_s_bh)->blk_nr_item ))
+#define B_LEVEL(bh)			(le16_to_cpu ( B_BLK_HEAD(bh)->blk_level ))
+#define B_FREE_SPACE(bh)		(le16_to_cpu ( B_BLK_HEAD(bh)->blk_free_space ))
+
+#define PUT_B_NR_ITEMS(p_s_bh)	  	do { B_BLK_HEAD(p_s_bh)->blk_nr_item = cpu_to_le16(val); } while (0)
+#define PUT_B_LEVEL(bh, val)		do { B_BLK_HEAD(bh)->blk_level = cpu_to_le16(val); } while (0)
+#define PUT_B_FREE_SPACE(bh)		do { B_BLK_HEAD(bh)->blk_free_space = cpu_to_le16(val); } while (0)
+
+/* Get right delimiting key. */
+#define B_PRIGHT_DELIM_KEY(p_s_bh)	( &(B_BLK_HEAD(p_s_bh)->blk_right_delim_key) )
+
+/* Does the buffer contain a disk leaf. */
+#define B_IS_ITEMS_LEVEL(p_s_bh)   	( B_BLK_HEAD(p_s_bh)->blk_level == DISK_LEAF_NODE_LEVEL )
+
+/* Does the buffer contain a disk internal node */
+#define B_IS_KEYS_LEVEL(p_s_bh) 	( B_BLK_HEAD(p_s_bh)->blk_level > DISK_LEAF_NODE_LEVEL &&\
+					  B_BLK_HEAD(p_s_bh)->blk_level <= 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))
+
+
+/* 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_reserved;
+    __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_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 40 bytes long
+//
+#define SD_SIZE (sizeof(struct stat_data))
+
+#define stat_data_v1(ih) (ih_version (ih) == ITEM_VERSION_1)
+
+
+/***************************************************************************/
+/*                      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)
+
+/* 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
+
+/* bitops which deals with unaligned addrs; 
+   needed for alpha port. --zam */
+#ifdef __alpha__
+#   define ADDR_UNALIGNED_BITS  (5)
+#endif
+
+#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)     set_bit((nr) + unaligned_offset(addr), aligned_address(addr))
+#   define clear_bit_unaligned(nr, addr)   clear_bit((nr) + unaligned_offset(addr), aligned_address(addr))
+#   define test_bit_unaligned(nr, addr)    test_bit((nr) + unaligned_offset(addr), aligned_address(addr))
+
+#else
+
+#   define set_bit_unaligned(nr, addr)     set_bit(nr, addr)
+#   define clear_bit_unaligned(nr, addr)   clear_bit(nr, addr)
+#   define test_bit_unaligned(nr, addr)    test_bit(nr, addr)
+
+#endif
+
+#define deh_dir_id(deh) (__le32_to_cpu ((deh)->deh_dir_id))
+#define deh_objectid(deh) (__le32_to_cpu ((deh)->deh_objectid))
+#define deh_offset(deh) (__le32_to_cpu ((deh)->deh_offset))
+
+
+#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))
+
+/* compose directory item containing "." and ".." entries (entries are
+   not aligned to 4 byte boundary) */
+extern inline void make_empty_dir_item_v1 (char * body, __u32 dirid, __u32 objid,
+					   __u32 par_dirid, __u32 par_objid)
+{
+    struct reiserfs_de_head * deh;
+
+    memset (body, 0, EMPTY_DIR_SIZE_V1);
+    deh = (struct reiserfs_de_head *)body;
+    
+    /* direntry header of "." */
+    deh[0].deh_offset = cpu_to_le32 (DOT_OFFSET);
+    deh[0].deh_dir_id = cpu_to_le32 (dirid);
+    deh[0].deh_objectid = cpu_to_le32 (objid);
+    deh[0].deh_location = cpu_to_le16 (EMPTY_DIR_SIZE_V1 - strlen ("."));
+    deh[0].deh_state = 0;
+    mark_de_visible(&(deh[0]));
+  
+    /* direntry header of ".." */
+    deh[1].deh_offset = cpu_to_le32 (DOT_DOT_OFFSET);
+    /* key of ".." for the root directory */
+    deh[1].deh_dir_id = cpu_to_le32 (par_dirid);
+    deh[1].deh_objectid = cpu_to_le32 (par_objid);
+    deh[1].deh_location = cpu_to_le16 (le16_to_cpu (deh[0].deh_location) - strlen (".."));
+    deh[1].deh_state = 0;
+    mark_de_visible(&(deh[1]));
+
+    /* copy ".." and "." */
+    memcpy (body + deh[0].deh_location, ".", 1);
+    memcpy (body + deh[1].deh_location, "..", 2);
+}
+
+/* compose directory item containing "." and ".." entries */
+extern inline void make_empty_dir_item (char * body, __u32 dirid, __u32 objid,
+					__u32 par_dirid, __u32 par_objid)
+{
+    struct reiserfs_de_head * deh;
+
+    memset (body, 0, EMPTY_DIR_SIZE);
+    deh = (struct reiserfs_de_head *)body;
+    
+    /* direntry header of "." */
+    deh[0].deh_offset = cpu_to_le32 (DOT_OFFSET);
+    deh[0].deh_dir_id = cpu_to_le32 (dirid);
+    deh[0].deh_objectid = cpu_to_le32 (objid);
+    deh[0].deh_location = cpu_to_le16 (EMPTY_DIR_SIZE - ROUND_UP (strlen (".")));
+    deh[0].deh_state = 0;
+    mark_de_visible(&(deh[0]));
+  
+    /* direntry header of ".." */
+    deh[1].deh_offset = cpu_to_le32 (DOT_DOT_OFFSET);
+    /* key of ".." for the root directory */
+    deh[1].deh_dir_id = cpu_to_le32 (par_dirid);
+    deh[1].deh_objectid = cpu_to_le32 (par_objid);
+    deh[1].deh_location = cpu_to_le16 (le16_to_cpu (deh[0].deh_location) - ROUND_UP (strlen ("..")));
+    deh[1].deh_state = 0;
+    mark_de_visible(&(deh[1]));
+
+    /* copy ".." and "." */
+    memcpy (body + deh[0].deh_location, ".", 1);
+    memcpy (body + deh[1].deh_location, "..", 2);
+}
+
+
+/* array of the entry headers */
+ /* get item body */
+#define B_I_PITEM(bh,ih) ( (bh)->b_data + (ih)->ih_item_location )
+#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)-1)->deh_location - (deh)->deh_location) : ((ih)->ih_item_len) - (deh)->deh_location)
+*/
+extern inline int entry_length (struct buffer_head * bh, 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 (le16_to_cpu ((deh - 1)->deh_location) - le16_to_cpu (deh->deh_location));
+    return (le16_to_cpu (ih->ih_item_len) - le16_to_cpu (deh->deh_location));
+}
+
+
+
+/* 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)->u.ih_entry_count)
+
+
+/* name by bh, ih and entry_num */
+#define B_I_E_NAME(bh,ih,entry_num) ((char *)(bh->b_data + ih->ih_item_location + (B_I_DEH(bh,ih)+(entry_num))->deh_location))
+
+// two entries per block (at least)
+//#define REISERFS_MAX_NAME_LEN(block_size) 
+//((block_size - BLKH_SIZE - IH_SIZE - DEH_SIZE * 2) / 2)
+
+// two entries per block (at least)
+#define REISERFS_MAX_NAME_LEN(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)->deh_location)
+
+/* 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))
+
+/* 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) (le32_to_cpu (B_N_CHILD(p_s_bh,n_pos)->dc_block_number))
+#define PUT_B_N_CHILD_NUM(p_s_bh,n_pos, val) do { B_N_CHILD(p_s_bh,n_pos)->dc_block_number = cpu_to_le32(val); } while (0)
+
+ /* 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! */
+
+
+struct  path {
+  int                   path_length;                      	/* Length of the array above.   */
+  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 = {ILLEGAL_PATH_ELEMENT_OFFSET, }
+
+/* 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_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))
+
+// in in-core inode key is stored on le form
+#define INODE_PKEY(inode) ((struct key *)((inode)->u.reiserfs_i.i_key))
+//#define mark_tail_converted(inode) (atomic_set(&((inode)->u.reiserfs_i.i_converted),1))
+//#define unmark_tail_converted(inode) (atomic_set(&((inode)->u.reiserfs_i.i_converted), 0))
+//#define is_tail_converted(inode) (atomic_read(&((inode)->u.reiserfs_i.i_converted)))
+
+
+
+#define MAX_UL_INT 0xffffffff
+#define MAX_INT    0x7ffffff
+#define MAX_US_INT 0xffff
+
+///#define TOO_LONG_LENGTH		(~0ULL)
+
+// reiserfs version 2 has max offset 60 bits. Version 1 - 32 bit offset
+#define U32_MAX (~(__u32)0)
+extern inline loff_t max_reiserfs_offset (struct inode * inode)
+{
+    if (inode_items_version (inode) == ITEM_VERSION_1)
+	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) ((s)->u.reiserfs_sb.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))
+
+
+/***************************************************************************/
+/*                  FIXATE NODES                                           */
+/***************************************************************************/
+
+//#define VI_TYPE_STAT_DATA 1
+//#define VI_TYPE_DIRECT 2
+//#define VI_TYPE_INDIRECT 4
+//#define VI_TYPE_DIRECTORY 8
+//#define VI_TYPE_FIRST_DIRECTORY_ITEM 16
+//#define VI_TYPE_INSERTED_DIRECTORY_ITEM 32
+
+#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) */
+};
+
+
+/***************************************************************************/
+/*                  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 */
+} ;
+
+
+#if 0
+				/* when balancing we potentially affect a 3 node wide column of nodes
+                                   in the tree (the top of the column may be tapered). C is the nodes
+                                   at the center of this column, and L and R are the nodes to the
+                                   left and right.  */
+  struct seal * L_path_seals[MAX_HEIGHT];
+  struct seal * C_path_seals[MAX_HEIGHT];
+  struct seal * R_path_seals[MAX_HEIGHT];
+  char L_path_lock_types[MAX_HEIGHT];   /* 'r', 'w', or 'n' for read, write, or none */
+  char C_path_lock_types[MAX_HEIGHT];
+  char R_path_lock_types[MAX_HEIGHT];
+
+
+  struct seal_list_elem * C_seal[MAX_HEIGHT];        /* array of seals on nodes in the path */
+  struct seal_list_elem * L_seal[MAX_HEIGHT];        /* array of seals on left neighbors of nodes in the path */
+  struct seal_list_elem * R_seal[MAX_HEIGHT];        /* array of seals on right neighbors of nodes in the path*/
+  struct seal_list_elem * FL_seal[MAX_HEIGHT];       /* array of seals on fathers of the left  neighbors      */
+  struct seal_list_elem * FR_seal[MAX_HEIGHT];       /* array of seals on fathers of the right neighbors      */
+  struct seal_list_elem * CFL_seal[MAX_HEIGHT];      /* array of seals on common parents of center node and its left neighbor  */
+  struct seal_list_elem * CFR_seal[MAX_HEIGHT];      /* array of seals on common parents of center node and its right neighbor */
+ 
+  struct char C_desired_lock_type[MAX_HEIGHT]; /* 'r', 'w', or 'n' for read, write, or none */
+  struct char L_desired_lock_type[MAX_HEIGHT];        
+  struct char R_desired_lock_type[MAX_HEIGHT];        
+  struct char FL_desired_lock_type[MAX_HEIGHT];       
+  struct char FR_desired_lock_type[MAX_HEIGHT];       
+  struct char CFL_desired_lock_type[MAX_HEIGHT];      
+  struct char CFR_desired_lock_type[MAX_HEIGHT];      
+#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 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 stat_data_ops, indirect_ops, direct_ops, 
+  direntry_ops;
+extern struct item_operations * item_ops [4];
+
+#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_KEYS comp_keys
+#define COMP_SHORT_KEYS comp_short_keys
+#define keys_of_same_object comp_short_keys
+
+/*#define COMP_KEYS(p_s_key1, p_s_key2)		comp_keys((unsigned long *)(p_s_key1), (unsigned long *)(p_s_key2))
+#define COMP_SHORT_KEYS(p_s_key1, p_s_key2)	comp_short_keys((unsigned long *)(p_s_key1), (unsigned long *)(p_s_key2))*/
+
+
+/* number of blocks pointed to by the indirect item */
+#define I_UNFM_NUM(p_s_ih)	( (p_s_ih)->ih_item_len / 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)->u.ih_free_space : (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 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 + B_N_PITEM_HEAD((bh),(item_num))->ih_item_location)
+
+/* 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+B_N_PITEM_HEAD((bh),(nr))->ih_item_location ) )
+
+                 /* 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)->ih_item_location) )
+
+// 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) (*(((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)
+
+/* Reiserfs buffer cache statistics. */
+#ifdef REISERFS_CACHE_STAT
+ struct reiserfs_cache_stat
+	{
+  	int nr_reiserfs_ll_r_block; 		/* Number of block reads. */
+  	int nr_reiserfs_ll_w_block; 		/* Number of block writes. */
+	int nr_reiserfs_schedule; 		/* Number of locked buffers waits. */
+	unsigned long nr_reiserfs_bread;	/* Number of calls to reiserfs_bread function */
+	unsigned long nr_returns; /* Number of breads of buffers that were hoped to contain a key but did not after bread completed
+				     (usually due to object shifting while bread was executing.)
+				     In the code this manifests as the number
+				     of times that the repeat variable is nonzero in search_by_key.*/
+	unsigned long nr_fixed;		/* number of calls of fix_nodes function */
+	unsigned long nr_failed;	/* number of calls of fix_nodes in which schedule occurred while the function worked */
+	unsigned long nr_find1;		/* How many times we access a child buffer using its direct pointer from an internal node.*/
+	unsigned long nr_find2;	        /* Number of times there is neither a direct pointer to
+					   nor any entry in the child list pointing to the buffer. */
+	unsigned long nr_find3;	        /* When parent is locked (meaning that there are no direct pointers)
+					   or parent is leaf and buffer to be found is an unformatted node. */
+	}  cache_stat;
+#endif
+
+struct reiserfs_iget4_args {
+    __u32 objectid ;
+} ;
+
+/***************************************************************************/
+/*                    FUNCTION DECLARATIONS                                */
+/***************************************************************************/
+
+/*#ifdef __KERNEL__*/
+
+/* journal.c see journal.c for all the comments here */
+
+#define JOURNAL_TRANS_HALF 1018   /* must be correct to keep the desc and commit structs at 4k */
+
+
+/* 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[JOURNAL_TRANS_HALF] ; /* real locations for each block */
+  char j_magic[12] ;
+} ;
+
+/* 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[JOURNAL_TRANS_HALF] ; /* real locations for each block */
+  char j_digest[16] ;			/* md5 sum of all the blocks involved, including desc and commit. not used, kill it */
+} ;
+
+/* 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 ;
+} ;
+
+/* these are used to keep flush pages that contain converted direct items.
+** if the page is not flushed before the transaction that converted it
+** is committed, we risk losing data
+**
+** note, while a page is in this list, its counter is incremented.
+*/
+struct reiserfs_page_list {
+  struct reiserfs_page_list *next ;
+  struct reiserfs_page_list *prev ;
+  struct page *page ;
+  unsigned long blocknr ; /* block number holding converted data */
+
+  /* if a transaction writer has the page locked the flush_page_list
+  ** function doesn't need to (and can't) get the lock while flushing
+  ** the page.  do_not_lock needs to be set by anyone who calls journal_end
+  ** with a page lock held.  They have to look in the inode and see
+  ** if the inode has the page they have locked in the flush list.
+  **
+  ** this sucks.
+  */
+  int do_not_lock ; 
+} ;
+
+extern task_queue reiserfs_commit_thread_tq ;
+extern wait_queue_head_t reiserfs_commit_thread_wait ;
+
+/* biggest tunable defines are right here */
+#define JOURNAL_BLOCK_COUNT 8192 /* number of blocks in the journal */
+#define JOURNAL_MAX_BATCH   900 /* max blocks to batch into one transaction, don't make this any bigger than 900 */
+#define JOURNAL_MAX_COMMIT_AGE 30 
+#define JOURNAL_MAX_TRANS_AGE 30
+#define JOURNAL_PER_BALANCE_CNT 12   /* must be >= (5 + 2 * (MAX_HEIGHT-2) + 1) */
+
+/* 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
+
+/* After several hours of tedious analysis, the following hash
+ * function won.  Do not mess with it... -DaveM
+ */
+#define _jhashfn(dev,block)	\
+	((((dev)<<(JBH_HASH_SHIFT - 6)) ^ ((dev)<<(JBH_HASH_SHIFT - 9))) ^ \
+	 (((block)<<(JBH_HASH_SHIFT - 6)) ^ ((block) >> 13) ^ ((block) << (JBH_HASH_SHIFT - 12))))
+#define journal_hash(t,dev,block) ((t)[_jhashfn((dev),(block)) & JBH_HASH_MASK])
+
+/* finds n'th buffer with 0 being the start of this commit.  Needs to go away, j_ap_blocks has changed
+** since I created this.  One chunk of code in journal.c needs changing before deleting it
+*/
+#define JOURNAL_BUFFER(j,n) ((j)->j_ap_blocks[((j)->j_start + (n)) % JOURNAL_BLOCK_COUNT])
+
+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(char *caller) ;
+void 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 *) ;
+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_dirty_nolog(struct reiserfs_transaction_handle *, struct super_block *, struct buffer_head *bh) ;
+int journal_mark_freed(struct reiserfs_transaction_handle *, struct super_block *, unsigned long blocknr) ;
+int push_journal_writer(char *w) ;
+int pop_journal_writer(int windex) ;
+int journal_lock_dobalance(struct super_block *p_s_sb) ;
+int journal_unlock_dobalance(struct super_block *p_s_sb) ;
+int journal_transaction_should_end(struct reiserfs_transaction_handle *, int) ;
+int reiserfs_in_journal(struct super_block *p_s_sb, kdev_t dev, unsigned long bl, int size, int searchall, unsigned long *next) ;
+int journal_begin(struct reiserfs_transaction_handle *, struct super_block *p_s_sb, unsigned long) ;
+int journal_join(struct reiserfs_transaction_handle *, struct super_block *p_s_sb, unsigned long) ;
+struct super_block *reiserfs_get_super(kdev_t dev) ;
+void flush_async_commits(struct super_block *p_s_sb) ;
+
+int remove_from_transaction(struct super_block *p_s_sb, unsigned long blocknr, int already_cleaned) ;
+int remove_from_journal_list(struct super_block *s, struct reiserfs_journal_list *jl, struct buffer_head *bh, int remove_freed) ;
+
+int buffer_journaled(struct buffer_head *bh) ;
+int mark_buffer_journal_new(struct buffer_head *bh) ;
+int reiserfs_sync_all_buffers(kdev_t dev, int wait) ;
+int reiserfs_sync_buffers(kdev_t dev, int wait) ;
+int reiserfs_add_page_to_flush_list(struct reiserfs_transaction_handle *,
+                                    struct inode *, struct buffer_head *) ;
+int reiserfs_remove_page_from_flush_list(struct reiserfs_transaction_handle *,
+                                         struct inode *) ;
+
+int reiserfs_allocate_list_bitmaps(struct super_block *s, struct reiserfs_list_bitmap *, int) ;
+
+				/* why is this kerplunked right here? */
+static inline int reiserfs_buffer_prepared(struct buffer_head *bh) {
+  if (bh && test_bit(BH_JPrepared, &bh->b_state))
+    return 1 ;
+  else
+    return 0 ;
+}
+
+/* buffer was journaled, waiting to get to disk */
+static inline int buffer_journal_dirty(struct buffer_head *bh) {
+  if (bh)
+    return test_bit(BH_JDirty_wait, &bh->b_state) ;
+  else
+    return 0 ;
+}
+static inline int mark_buffer_notjournal_dirty(struct buffer_head *bh) {
+  if (bh)
+    clear_bit(BH_JDirty_wait, &bh->b_state) ;
+  return 0 ;
+}
+static inline int mark_buffer_notjournal_new(struct buffer_head *bh) {
+  if (bh) {
+    clear_bit(BH_JNew, &bh->b_state) ;
+  }
+  return 0 ;
+}
+
+/* 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(struct buffer_head *);
+extern inline void copy_key (void * to, void * from);
+extern inline void copy_short_key (void * to, void * from);
+extern inline void copy_item_head(void * p_v_to, void * p_v_from);
+
+// first key is in cpu form, second - le
+extern inline int comp_keys (struct key * le_key, struct cpu_key * cpu_key);
+extern inline int  comp_short_keys (struct key * le_key, struct cpu_key * cpu_key);
+extern inline void le_key2cpu_key (struct cpu_key * to, struct key * from);
+
+// both are cpu keys
+extern inline int comp_cpu_keys (struct cpu_key *, struct cpu_key *);
+extern inline int comp_short_cpu_keys (struct cpu_key *, struct cpu_key *);
+extern inline void cpu_key2cpu_key (struct cpu_key *, struct cpu_key *);
+
+// both are in le form
+extern inline int comp_le_keys (struct key *, struct key *);
+extern inline int comp_short_le_keys (struct key *, struct key *);
+
+//
+// get key version from on disk key - kludge
+//
+extern inline int le_key_version (struct key * key)
+{
+    int type;
+    
+    type = le16_to_cpu (key->u.k_offset_v2.k_type);
+    if (type != TYPE_DIRECT && type != TYPE_INDIRECT && type != TYPE_DIRENTRY)
+	return ITEM_VERSION_1;
+
+    return ITEM_VERSION_2;
+	
+}
+
+
+extern inline void copy_key (void * to, void * from)
+{
+  memcpy (to, from, KEY_SIZE);
+}
+
+
+int comp_items (struct item_head  * p_s_ih, struct path * p_s_path);
+struct key * get_rkey (struct path * p_s_chk_path, struct super_block  * p_s_sb);
+inline int bin_search (void * p_v_key, void * p_v_base, int p_n_num, int p_n_width, int * p_n_pos);
+int search_by_key (struct super_block *, 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, struct cpu_key * p_s_cpu_key, struct path * p_s_search_path);
+extern inline 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, 
+			  struct cpu_key * key,
+			  struct item_head * ih, const char * body);
+
+int reiserfs_paste_into_item (struct reiserfs_transaction_handle *th,
+			      struct path * path,
+			      struct cpu_key * key,
+			      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, 
+			  struct cpu_key * key,
+			  struct inode * inode, 
+			  struct buffer_head  * p_s_un_bh);
+
+
+void reiserfs_delete_object (struct reiserfs_transaction_handle *th, struct inode * p_s_inode);
+void reiserfs_do_truncate (struct reiserfs_transaction_handle *th, 
+			   struct  inode * p_s_inode, struct page *, 
+			   int update_timestamps);
+//
+//void lock_inode_to_convert (struct inode * p_s_inode);
+//void unlock_inode_after_convert (struct inode * p_s_inode);
+//void increment_i_read_sync_counter (struct inode * p_s_inode);
+//void decrement_i_read_sync_counter (struct inode * p_s_inode);
+
+
+#define block_size(inode) ((inode)->i_sb->s_blocksize)
+#define file_size(inode) ((inode)->i_size)
+#define tail_size(inode) (file_size (inode) & (block_size (inode) - 1))
+
+#define tail_has_to_be_packed(inode) (!dont_have_tails ((inode)->i_sb) &&\
+!STORE_TAIL_IN_UNFM(file_size (inode), tail_size(inode), block_size (inode)))
+
+/*
+int get_buffer_by_range (struct super_block * p_s_sb, struct key * p_s_range_begin, struct key * p_s_range_end, 
+			 struct buffer_head ** pp_s_buf, unsigned long * p_n_objectid);
+int get_buffers_from_range (struct super_block * p_s_sb, struct key * p_s_range_start, struct key * p_s_range_end, 
+                            struct buffer_head ** p_s_range_buffers,
+			    int n_max_nr_buffers_to_return);
+*/
+
+#ifndef REISERFS_FSCK
+
+//inline int is_left_mergeable (struct item_head * ih, unsigned long bsize);
+
+#else
+
+int is_left_mergeable (struct super_block * s, struct path * path);
+int is_right_mergeable (struct super_block * s, struct path * path);
+int are_items_mergeable (struct item_head * left, struct item_head * right, int bsize);
+
+#endif
+void padd_item (char * item, int total_length, int length);
+
+
+/* inode.c */
+
+int reiserfs_prepare_write(struct file *, struct page *, unsigned, unsigned) ;
+void reiserfs_truncate_file(struct inode *, int update_timestamps) ;
+void make_cpu_key (struct cpu_key * cpu_key, const struct inode * inode, loff_t offset,
+		   int type, int key_length);
+void make_le_item_head (struct item_head * ih, struct cpu_key * key, int version,
+			       loff_t offset, int type, int length, int entry_count);
+/*void store_key (struct key * key);
+void forget_key (struct key * key);*/
+int reiserfs_get_block (struct inode * inode, long block,
+			struct buffer_head * bh_result, int create);
+struct inode * reiserfs_iget (struct super_block * s, struct cpu_key * key);
+void reiserfs_read_inode (struct inode * inode) ;
+void reiserfs_read_inode2(struct inode * inode, void *p) ;
+void reiserfs_delete_inode (struct inode * inode);
+extern int reiserfs_notify_change(struct dentry * dentry, struct iattr * attr);
+void reiserfs_write_inode (struct inode * inode, int) ;
+
+/* we don't mark inodes dirty, we just log them */
+void reiserfs_dirty_inode (struct inode * inode) ;
+
+struct inode * reiserfs_new_inode (struct reiserfs_transaction_handle *th, const struct inode * dir, int mode, 
+				   const char * symname, int item_len,
+				   struct dentry *dentry, struct inode *inode, int * err);
+int reiserfs_sync_inode (struct reiserfs_transaction_handle *th, struct inode * inode);
+void reiserfs_update_sd (struct reiserfs_transaction_handle *th, struct inode * inode);
+int reiserfs_inode_setattr(struct dentry *,  struct iattr * attr);
+
+/* namei.c */
+inline void set_de_name_and_namelen (struct reiserfs_dir_entry * de);
+int search_by_entry_key (struct super_block * sb, struct cpu_key * key, struct path * path, 
+			 struct reiserfs_dir_entry * de);
+struct dentry * reiserfs_lookup (struct inode * dir, struct dentry *dentry);
+int reiserfs_create (struct inode * dir, struct dentry *dentry,	int mode);
+int reiserfs_mknod (struct inode * dir_inode, struct dentry *dentry, int mode, int rdev);
+int reiserfs_mkdir (struct inode * dir, struct dentry *dentry, int mode);
+int reiserfs_rmdir (struct inode * dir,	struct dentry *dentry);
+int reiserfs_unlink (struct inode * dir, struct dentry *dentry);
+int reiserfs_symlink (struct inode * dir, struct dentry *dentry, const char * symname);
+int reiserfs_link (struct dentry * old_dentry, struct inode * dir, struct dentry *dentry);
+int reiserfs_rename (struct inode * old_dir, struct dentry *old_dentry, struct inode * new_dir, struct dentry *new_dentry);
+
+/* super.c */
+inline void reiserfs_mark_buffer_dirty (struct buffer_head * bh, int flag);
+inline void reiserfs_mark_buffer_clean (struct buffer_head * bh);
+void reiserfs_panic (struct super_block * s, const char * fmt, ...);
+void reiserfs_write_super (struct super_block * s);
+void reiserfs_put_super (struct super_block * s);
+int reiserfs_remount (struct super_block * s, int * flags, char * data);
+/*int read_super_block (struct super_block * s, int size);
+int read_bitmaps (struct super_block * s);
+int read_old_bitmaps (struct super_block * s);
+int read_old_super_block (struct super_block * s, int size);*/
+struct super_block * reiserfs_read_super (struct super_block * s, void * data, int silent);
+int reiserfs_statfs (struct super_block * s, struct statfs * buf);
+
+/* dir.c */
+extern struct inode_operations reiserfs_dir_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 *, 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 ;
+int get_new_buffer (struct reiserfs_transaction_handle *th, struct buffer_head *,
+		    struct buffer_head **, struct path *);
+
+
+/* buffer2.c */
+struct buffer_head * reiserfs_getblk (kdev_t n_dev, int n_block, int n_size);
+void wait_buffer_until_released (struct buffer_head * bh);
+struct buffer_head * reiserfs_bread (kdev_t n_dev, int n_block, int n_size);
+
+
+/* fix_nodes.c */
+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);
+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 *);
+void free_buffers_in_tb (struct tree_balance * p_s_tb);
+
+
+/* prints.c */
+void reiserfs_panic (struct super_block * s, const char * fmt, ...);
+void reiserfs_warning (const char * fmt, ...);
+void reiserfs_debug (struct super_block *s, int level, const char * fmt, ...);
+void print_virtual_node (struct virtual_node * vn);
+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_path (struct tree_balance * tb, struct path * path);
+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);
+
+/* 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 */
+inline 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 replace_lkey (struct tree_balance *, int, struct item_head *);
+void replace_rkey (struct tree_balance *, int, struct item_head *);
+void make_empty_node (struct buffer_info *);
+struct buffer_head * get_FEB (struct tree_balance *);
+
+/* bitmap.c */
+int is_reusable (struct super_block * s, unsigned long block, int bit_value);
+void reiserfs_free_block (struct reiserfs_transaction_handle *th, unsigned long);
+int reiserfs_new_blocknrs (struct reiserfs_transaction_handle *th,
+			   unsigned long * pblocknrs, unsigned long start_from, int amount_needed);
+int reiserfs_new_unf_blocknrs (struct reiserfs_transaction_handle *th,
+			       unsigned long * pblocknr, unsigned long start_from);
+#ifdef REISERFS_PREALLOCATE
+int reiserfs_new_unf_blocknrs2 (struct reiserfs_transaction_handle *th, 
+				struct inode * inode,
+				unsigned long * pblocknr, 
+				unsigned long start_from);
+
+void reiserfs_discard_prealloc (struct reiserfs_transaction_handle *th, 
+				struct inode * inode);
+#endif
+
+/* hashes.c */
+__u32 keyed_hash (const char *msg, int len);
+__u32 yura_hash (const char *msg, int len);
+__u32 r5_hash (const char *msg, int len);
+
+/* version.c */
+char *reiserfs_get_version_string(void) ;
+
+/* 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
+
+
+//
+// this was totally copied from from linux's
+// find_first_zero_bit and changed a bit
+//
+
+#ifdef __i386__
+
+extern __inline__ int 
+find_first_nonzero_bit(void * addr, unsigned size) {
+  int res;
+  int __d0;
+  void *__d1;
+
+
+  if (!size) {
+    return (0);
+  }
+  __asm__ __volatile__ (
+	  "cld\n\t"
+	  "xorl %%eax,%%eax\n\t"
+	  "repe; scasl\n\t"
+	  "je 1f\n\t"
+	  "movl -4(%%edi),%%eax\n\t"
+	  "subl $4, %%edi\n\t"
+	  "bsfl %%eax,%%eax\n\t"
+	  "1:\tsubl %%edx,%%edi\n\t"
+	  "shll $3,%%edi\n\t"
+	  "addl %%edi,%%eax"
+	  :"=a" (res),
+	  "=c"(__d0), "=D"(__d1)
+	  :"1" ((size + 31) >> 5), "d" (addr), "2" (addr));
+  return (res);
+}
+
+#else /* __i386__ */
+
+extern __inline__ int find_next_nonzero_bit(void * addr, unsigned size, unsigned offset)
+{
+	unsigned int * p = ((unsigned int *) addr) + (offset >> 5);
+	unsigned int result = offset & ~31UL;
+	unsigned int tmp;
+
+	if (offset >= size)
+		return size;
+	size -= result;
+	offset &= 31UL;
+	if (offset) {
+		tmp = *p++;
+		/* set to zero first offset bits */
+		tmp &= ~(~0UL >> (32-offset));
+		if (size < 32)
+			goto found_first;
+		if (tmp != 0U)
+			goto found_middle;
+		size -= 32;
+		result += 32;
+	}
+	while (size >= 32) {
+		if ((tmp = *p++) != 0U)
+			goto found_middle;
+		result += 32;
+		size -= 32;
+	}
+	if (!size)
+		return result;
+	tmp = *p;
+found_first:
+found_middle:
+	return result + ffs(tmp);
+}
+
+#define find_first_nonzero_bit(addr,size) find_next_nonzero_bit((addr), (size), 0)
+
+#endif /* 0 */
+
+/* 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
+
+extern inline unsigned long reiserfs_get_journal_block(struct super_block *s) {
+    return le32_to_cpu(SB_DISK_SUPER_BLOCK(s)->s_journal_block) ;
+}
+extern inline unsigned long reiserfs_get_journal_orig_size(struct super_block *s) {
+    return le32_to_cpu(SB_DISK_SUPER_BLOCK(s)->s_orig_journal_size) ;
+}
+
+/* prototypes from ioctl.c */
+int reiserfs_ioctl (struct inode * inode, struct file * filp, 
+ 		    unsigned int cmd, unsigned long arg);
+int reiserfs_unpack (struct inode * inode, struct file * filp);
+ 
+/* ioctl's command */
+#define REISERFS_IOC_UNPACK		_IOW(0xCD,1,long)
+ 			         
+#endif /* _LINUX_REISER_FS_H */
+
+