init android origin source code

1 files changed, 2074 insertions, 0 deletions

diff --git a/ANDROID_3.4.5/fs/reiserfs/do_balan.c b/ANDROID_3.4.5/fs/reiserfs/do_balan.c
new file mode 100644
index 00000000..2b7882b5
--- /dev/null
+++ b/ANDROID_3.4.5/fs/reiserfs/do_balan.c
@@ -0,0 +1,2074 @@
+/*
+ * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
+ */
+
+/* Now we have all buffers that must be used in balancing of the tree 	*/
+/* Further calculations can not cause schedule(), and thus the buffer 	*/
+/* tree will be stable until the balancing will be finished 		*/
+/* balance the tree according to the analysis made before,		*/
+/* and using buffers obtained after all above.				*/
+
+/**
+ ** balance_leaf_when_delete
+ ** balance_leaf
+ ** do_balance
+ **
+ **/
+
+#include <asm/uaccess.h>
+#include <linux/time.h>
+#include "reiserfs.h"
+#include <linux/buffer_head.h>
+#include <linux/kernel.h>
+
+static inline void buffer_info_init_left(struct tree_balance *tb,
+                                         struct buffer_info *bi)
+{
+	bi->tb          = tb;
+	bi->bi_bh       = tb->L[0];
+	bi->bi_parent   = tb->FL[0];
+	bi->bi_position = get_left_neighbor_position(tb, 0);
+}
+
+static inline void buffer_info_init_right(struct tree_balance *tb,
+                                          struct buffer_info *bi)
+{
+	bi->tb          = tb;
+	bi->bi_bh       = tb->R[0];
+	bi->bi_parent   = tb->FR[0];
+	bi->bi_position = get_right_neighbor_position(tb, 0);
+}
+
+static inline void buffer_info_init_tbS0(struct tree_balance *tb,
+                                         struct buffer_info *bi)
+{
+	bi->tb          = tb;
+	bi->bi_bh        = PATH_PLAST_BUFFER(tb->tb_path);
+	bi->bi_parent   = PATH_H_PPARENT(tb->tb_path, 0);
+	bi->bi_position = PATH_H_POSITION(tb->tb_path, 1);
+}
+
+static inline void buffer_info_init_bh(struct tree_balance *tb,
+                                       struct buffer_info *bi,
+                                       struct buffer_head *bh)
+{
+	bi->tb          = tb;
+	bi->bi_bh       = bh;
+	bi->bi_parent   = NULL;
+	bi->bi_position = 0;
+}
+
+inline void do_balance_mark_leaf_dirty(struct tree_balance *tb,
+				       struct buffer_head *bh, int flag)
+{
+	journal_mark_dirty(tb->transaction_handle,
+			   tb->transaction_handle->t_super, bh);
+}
+
+#define do_balance_mark_internal_dirty do_balance_mark_leaf_dirty
+#define do_balance_mark_sb_dirty do_balance_mark_leaf_dirty
+
+/* summary:
+ if deleting something ( tb->insert_size[0] < 0 )
+   return(balance_leaf_when_delete()); (flag d handled here)
+ else
+   if lnum is larger than 0 we put items into the left node
+   if rnum is larger than 0 we put items into the right node
+   if snum1 is larger than 0 we put items into the new node s1
+   if snum2 is larger than 0 we put items into the new node s2
+Note that all *num* count new items being created.
+
+It would be easier to read balance_leaf() if each of these summary
+lines was a separate procedure rather than being inlined.  I think
+that there are many passages here and in balance_leaf_when_delete() in
+which two calls to one procedure can replace two passages, and it
+might save cache space and improve software maintenance costs to do so.
+
+Vladimir made the perceptive comment that we should offload most of
+the decision making in this function into fix_nodes/check_balance, and
+then create some sort of structure in tb that says what actions should
+be performed by do_balance.
+
+-Hans */
+
+/* Balance leaf node in case of delete or cut: insert_size[0] < 0
+ *
+ * lnum, rnum can have values >= -1
+ *	-1 means that the neighbor must be joined with S
+ *	 0 means that nothing should be done with the neighbor
+ *	>0 means to shift entirely or partly the specified number of items to the neighbor
+ */
+static int balance_leaf_when_delete(struct tree_balance *tb, int flag)
+{
+	struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
+	int item_pos = PATH_LAST_POSITION(tb->tb_path);
+	int pos_in_item = tb->tb_path->pos_in_item;
+	struct buffer_info bi;
+	int n;
+	struct item_head *ih;
+
+	RFALSE(tb->FR[0] && B_LEVEL(tb->FR[0]) != DISK_LEAF_NODE_LEVEL + 1,
+	       "vs- 12000: level: wrong FR %z", tb->FR[0]);
+	RFALSE(tb->blknum[0] > 1,
+	       "PAP-12005: tb->blknum == %d, can not be > 1", tb->blknum[0]);
+	RFALSE(!tb->blknum[0] && !PATH_H_PPARENT(tb->tb_path, 0),
+	       "PAP-12010: tree can not be empty");
+
+	ih = B_N_PITEM_HEAD(tbS0, item_pos);
+	buffer_info_init_tbS0(tb, &bi);
+
+	/* Delete or truncate the item */
+
+	switch (flag) {
+	case M_DELETE:		/* delete item in S[0] */
+
+		RFALSE(ih_item_len(ih) + IH_SIZE != -tb->insert_size[0],
+		       "vs-12013: mode Delete, insert size %d, ih to be deleted %h",
+		       -tb->insert_size[0], ih);
+
+		leaf_delete_items(&bi, 0, item_pos, 1, -1);
+
+		if (!item_pos && tb->CFL[0]) {
+			if (B_NR_ITEMS(tbS0)) {
+				replace_key(tb, tb->CFL[0], tb->lkey[0], tbS0,
+					    0);
+			} else {
+				if (!PATH_H_POSITION(tb->tb_path, 1))
+					replace_key(tb, tb->CFL[0], tb->lkey[0],
+						    PATH_H_PPARENT(tb->tb_path,
+								   0), 0);
+			}
+		}
+
+		RFALSE(!item_pos && !tb->CFL[0],
+		       "PAP-12020: tb->CFL[0]==%p, tb->L[0]==%p", tb->CFL[0],
+		       tb->L[0]);
+
+		break;
+
+	case M_CUT:{		/* cut item in S[0] */
+			if (is_direntry_le_ih(ih)) {
+
+				/* UFS unlink semantics are such that you can only delete one directory entry at a time. */
+				/* when we cut a directory tb->insert_size[0] means number of entries to be cut (always 1) */
+				tb->insert_size[0] = -1;
+				leaf_cut_from_buffer(&bi, item_pos, pos_in_item,
+						     -tb->insert_size[0]);
+
+				RFALSE(!item_pos && !pos_in_item && !tb->CFL[0],
+				       "PAP-12030: can not change delimiting key. CFL[0]=%p",
+				       tb->CFL[0]);
+
+				if (!item_pos && !pos_in_item && tb->CFL[0]) {
+					replace_key(tb, tb->CFL[0], tb->lkey[0],
+						    tbS0, 0);
+				}
+			} else {
+				leaf_cut_from_buffer(&bi, item_pos, pos_in_item,
+						     -tb->insert_size[0]);
+
+				RFALSE(!ih_item_len(ih),
+				       "PAP-12035: cut must leave non-zero dynamic length of item");
+			}
+			break;
+		}
+
+	default:
+		print_cur_tb("12040");
+		reiserfs_panic(tb->tb_sb, "PAP-12040",
+			       "unexpected mode: %s(%d)",
+			       (flag ==
+				M_PASTE) ? "PASTE" : ((flag ==
+						       M_INSERT) ? "INSERT" :
+						      "UNKNOWN"), flag);
+	}
+
+	/* the rule is that no shifting occurs unless by shifting a node can be freed */
+	n = B_NR_ITEMS(tbS0);
+	if (tb->lnum[0]) {	/* L[0] takes part in balancing */
+		if (tb->lnum[0] == -1) {	/* L[0] must be joined with S[0] */
+			if (tb->rnum[0] == -1) {	/* R[0] must be also joined with S[0] */
+				if (tb->FR[0] == PATH_H_PPARENT(tb->tb_path, 0)) {
+					/* all contents of all the 3 buffers will be in L[0] */
+					if (PATH_H_POSITION(tb->tb_path, 1) == 0
+					    && 1 < B_NR_ITEMS(tb->FR[0]))
+						replace_key(tb, tb->CFL[0],
+							    tb->lkey[0],
+							    tb->FR[0], 1);
+
+					leaf_move_items(LEAF_FROM_S_TO_L, tb, n,
+							-1, NULL);
+					leaf_move_items(LEAF_FROM_R_TO_L, tb,
+							B_NR_ITEMS(tb->R[0]),
+							-1, NULL);
+
+					reiserfs_invalidate_buffer(tb, tbS0);
+					reiserfs_invalidate_buffer(tb,
+								   tb->R[0]);
+
+					return 0;
+				}
+				/* all contents of all the 3 buffers will be in R[0] */
+				leaf_move_items(LEAF_FROM_S_TO_R, tb, n, -1,
+						NULL);
+				leaf_move_items(LEAF_FROM_L_TO_R, tb,
+						B_NR_ITEMS(tb->L[0]), -1, NULL);
+
+				/* right_delimiting_key is correct in R[0] */
+				replace_key(tb, tb->CFR[0], tb->rkey[0],
+					    tb->R[0], 0);
+
+				reiserfs_invalidate_buffer(tb, tbS0);
+				reiserfs_invalidate_buffer(tb, tb->L[0]);
+
+				return -1;
+			}
+
+			RFALSE(tb->rnum[0] != 0,
+			       "PAP-12045: rnum must be 0 (%d)", tb->rnum[0]);
+			/* all contents of L[0] and S[0] will be in L[0] */
+			leaf_shift_left(tb, n, -1);
+
+			reiserfs_invalidate_buffer(tb, tbS0);
+
+			return 0;
+		}
+		/* a part of contents of S[0] will be in L[0] and the rest part of S[0] will be in R[0] */
+
+		RFALSE((tb->lnum[0] + tb->rnum[0] < n) ||
+		       (tb->lnum[0] + tb->rnum[0] > n + 1),
+		       "PAP-12050: rnum(%d) and lnum(%d) and item number(%d) in S[0] are not consistent",
+		       tb->rnum[0], tb->lnum[0], n);
+		RFALSE((tb->lnum[0] + tb->rnum[0] == n) &&
+		       (tb->lbytes != -1 || tb->rbytes != -1),
+		       "PAP-12055: bad rbytes (%d)/lbytes (%d) parameters when items are not split",
+		       tb->rbytes, tb->lbytes);
+		RFALSE((tb->lnum[0] + tb->rnum[0] == n + 1) &&
+		       (tb->lbytes < 1 || tb->rbytes != -1),
+		       "PAP-12060: bad rbytes (%d)/lbytes (%d) parameters when items are split",
+		       tb->rbytes, tb->lbytes);
+
+		leaf_shift_left(tb, tb->lnum[0], tb->lbytes);
+		leaf_shift_right(tb, tb->rnum[0], tb->rbytes);
+
+		reiserfs_invalidate_buffer(tb, tbS0);
+
+		return 0;
+	}
+
+	if (tb->rnum[0] == -1) {
+		/* all contents of R[0] and S[0] will be in R[0] */
+		leaf_shift_right(tb, n, -1);
+		reiserfs_invalidate_buffer(tb, tbS0);
+		return 0;
+	}
+
+	RFALSE(tb->rnum[0],
+	       "PAP-12065: bad rnum parameter must be 0 (%d)", tb->rnum[0]);
+	return 0;
+}
+
+static int balance_leaf(struct tree_balance *tb, struct item_head *ih,	/* item header of inserted item (this is on little endian) */
+			const char *body,	/* body  of inserted item or bytes to paste */
+			int flag,	/* i - insert, d - delete, c - cut, p - paste
+					   (see comment to do_balance) */
+			struct item_head *insert_key,	/* in our processing of one level we sometimes determine what
+							   must be inserted into the next higher level.  This insertion
+							   consists of a key or two keys and their corresponding
+							   pointers */
+			struct buffer_head **insert_ptr	/* inserted node-ptrs for the next level */
+    )
+{
+	struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
+	int item_pos = PATH_LAST_POSITION(tb->tb_path);	/*  index into the array of item headers in S[0]
+							   of the affected item */
+	struct buffer_info bi;
+	struct buffer_head *S_new[2];	/* new nodes allocated to hold what could not fit into S */
+	int snum[2];		/* number of items that will be placed
+				   into S_new (includes partially shifted
+				   items) */
+	int sbytes[2];		/* if an item is partially shifted into S_new then
+				   if it is a directory item
+				   it is the number of entries from the item that are shifted into S_new
+				   else
+				   it is the number of bytes from the item that are shifted into S_new
+				 */
+	int n, i;
+	int ret_val;
+	int pos_in_item;
+	int zeros_num;
+
+	PROC_INFO_INC(tb->tb_sb, balance_at[0]);
+
+	/* Make balance in case insert_size[0] < 0 */
+	if (tb->insert_size[0] < 0)
+		return balance_leaf_when_delete(tb, flag);
+
+	zeros_num = 0;
+	if (flag == M_INSERT && !body)
+		zeros_num = ih_item_len(ih);
+
+	pos_in_item = tb->tb_path->pos_in_item;
+	/* for indirect item pos_in_item is measured in unformatted node
+	   pointers. Recalculate to bytes */
+	if (flag != M_INSERT
+	    && is_indirect_le_ih(B_N_PITEM_HEAD(tbS0, item_pos)))
+		pos_in_item *= UNFM_P_SIZE;
+
+	if (tb->lnum[0] > 0) {
+		/* Shift lnum[0] items from S[0] to the left neighbor L[0] */
+		if (item_pos < tb->lnum[0]) {
+			/* new item or it part falls to L[0], shift it too */
+			n = B_NR_ITEMS(tb->L[0]);
+
+			switch (flag) {
+			case M_INSERT:	/* insert item into L[0] */
+
+				if (item_pos == tb->lnum[0] - 1
+				    && tb->lbytes != -1) {
+					/* part of new item falls into L[0] */
+					int new_item_len;
+					int version;
+
+					ret_val =
+					    leaf_shift_left(tb, tb->lnum[0] - 1,
+							    -1);
+
+					/* Calculate item length to insert to S[0] */
+					new_item_len =
+					    ih_item_len(ih) - tb->lbytes;
+					/* Calculate and check item length to insert to L[0] */
+					put_ih_item_len(ih,
+							ih_item_len(ih) -
+							new_item_len);
+
+					RFALSE(ih_item_len(ih) <= 0,
+					       "PAP-12080: there is nothing to insert into L[0]: ih_item_len=%d",
+					       ih_item_len(ih));
+
+					/* Insert new item into L[0] */
+					buffer_info_init_left(tb, &bi);
+					leaf_insert_into_buf(&bi,
+							     n + item_pos -
+							     ret_val, ih, body,
+							     zeros_num >
+							     ih_item_len(ih) ?
+							     ih_item_len(ih) :
+							     zeros_num);
+
+					version = ih_version(ih);
+
+					/* Calculate key component, item length and body to insert into S[0] */
+					set_le_ih_k_offset(ih,
+							   le_ih_k_offset(ih) +
+							   (tb->
+							    lbytes <<
+							    (is_indirect_le_ih
+							     (ih) ? tb->tb_sb->
+							     s_blocksize_bits -
+							     UNFM_P_SHIFT :
+							     0)));
+
+					put_ih_item_len(ih, new_item_len);
+					if (tb->lbytes > zeros_num) {
+						body +=
+						    (tb->lbytes - zeros_num);
+						zeros_num = 0;
+					} else
+						zeros_num -= tb->lbytes;
+
+					RFALSE(ih_item_len(ih) <= 0,
+					       "PAP-12085: there is nothing to insert into S[0]: ih_item_len=%d",
+					       ih_item_len(ih));
+				} else {
+					/* new item in whole falls into L[0] */
+					/* Shift lnum[0]-1 items to L[0] */
+					ret_val =
+					    leaf_shift_left(tb, tb->lnum[0] - 1,
+							    tb->lbytes);
+					/* Insert new item into L[0] */
+					buffer_info_init_left(tb, &bi);
+					leaf_insert_into_buf(&bi,
+							     n + item_pos -
+							     ret_val, ih, body,
+							     zeros_num);
+					tb->insert_size[0] = 0;
+					zeros_num = 0;
+				}
+				break;
+
+			case M_PASTE:	/* append item in L[0] */
+
+				if (item_pos == tb->lnum[0] - 1
+				    && tb->lbytes != -1) {
+					/* we must shift the part of the appended item */
+					if (is_direntry_le_ih
+					    (B_N_PITEM_HEAD(tbS0, item_pos))) {
+
+						RFALSE(zeros_num,
+						       "PAP-12090: invalid parameter in case of a directory");
+						/* directory item */
+						if (tb->lbytes > pos_in_item) {
+							/* new directory entry falls into L[0] */
+							struct item_head
+							    *pasted;
+							int l_pos_in_item =
+							    pos_in_item;
+
+							/* Shift lnum[0] - 1 items in whole. Shift lbytes - 1 entries from given directory item */
+							ret_val =
+							    leaf_shift_left(tb,
+									    tb->
+									    lnum
+									    [0],
+									    tb->
+									    lbytes
+									    -
+									    1);
+							if (ret_val
+							    && !item_pos) {
+								pasted =
+								    B_N_PITEM_HEAD
+								    (tb->L[0],
+								     B_NR_ITEMS
+								     (tb->
+								      L[0]) -
+								     1);
+								l_pos_in_item +=
+								    I_ENTRY_COUNT
+								    (pasted) -
+								    (tb->
+								     lbytes -
+								     1);
+							}
+
+							/* Append given directory entry to directory item */
+							buffer_info_init_left(tb, &bi);
+							leaf_paste_in_buffer
+							    (&bi,
+							     n + item_pos -
+							     ret_val,
+							     l_pos_in_item,
+							     tb->insert_size[0],
+							     body, zeros_num);
+
+							/* previous string prepared space for pasting new entry, following string pastes this entry */
+
+							/* when we have merge directory item, pos_in_item has been changed too */
+
+							/* paste new directory entry. 1 is entry number */
+							leaf_paste_entries(&bi,
+									   n +
+									   item_pos
+									   -
+									   ret_val,
+									   l_pos_in_item,
+									   1,
+									   (struct
+									    reiserfs_de_head
+									    *)
+									   body,
+									   body
+									   +
+									   DEH_SIZE,
+									   tb->
+									   insert_size
+									   [0]
+							    );
+							tb->insert_size[0] = 0;
+						} else {
+							/* new directory item doesn't fall into L[0] */
+							/* Shift lnum[0]-1 items in whole. Shift lbytes directory entries from directory item number lnum[0] */
+							leaf_shift_left(tb,
+									tb->
+									lnum[0],
+									tb->
+									lbytes);
+						}
+						/* Calculate new position to append in item body */
+						pos_in_item -= tb->lbytes;
+					} else {
+						/* regular object */
+						RFALSE(tb->lbytes <= 0,
+						       "PAP-12095: there is nothing to shift to L[0]. lbytes=%d",
+						       tb->lbytes);
+						RFALSE(pos_in_item !=
+						       ih_item_len
+						       (B_N_PITEM_HEAD
+							(tbS0, item_pos)),
+						       "PAP-12100: incorrect position to paste: item_len=%d, pos_in_item=%d",
+						       ih_item_len
+						       (B_N_PITEM_HEAD
+							(tbS0, item_pos)),
+						       pos_in_item);
+
+						if (tb->lbytes >= pos_in_item) {
+							/* appended item will be in L[0] in whole */
+							int l_n;
+
+							/* this bytes number must be appended to the last item of L[h] */
+							l_n =
+							    tb->lbytes -
+							    pos_in_item;
+
+							/* Calculate new insert_size[0] */
+							tb->insert_size[0] -=
+							    l_n;
+
+							RFALSE(tb->
+							       insert_size[0] <=
+							       0,
+							       "PAP-12105: there is nothing to paste into L[0]. insert_size=%d",
+							       tb->
+							       insert_size[0]);
+							ret_val =
+							    leaf_shift_left(tb,
+									    tb->
+									    lnum
+									    [0],
+									    ih_item_len
+									    (B_N_PITEM_HEAD
+									     (tbS0,
+									      item_pos)));
+							/* Append to body of item in L[0] */
+							buffer_info_init_left(tb, &bi);
+							leaf_paste_in_buffer
+							    (&bi,
+							     n + item_pos -
+							     ret_val,
+							     ih_item_len
+							     (B_N_PITEM_HEAD
+							      (tb->L[0],
+							       n + item_pos -
+							       ret_val)), l_n,
+							     body,
+							     zeros_num >
+							     l_n ? l_n :
+							     zeros_num);
+							/* 0-th item in S0 can be only of DIRECT type when l_n != 0 */
+							{
+								int version;
+								int temp_l =
+								    l_n;
+
+								RFALSE
+								    (ih_item_len
+								     (B_N_PITEM_HEAD
+								      (tbS0,
+								       0)),
+								     "PAP-12106: item length must be 0");
+								RFALSE
+								    (comp_short_le_keys
+								     (B_N_PKEY
+								      (tbS0, 0),
+								      B_N_PKEY
+								      (tb->L[0],
+								       n +
+								       item_pos
+								       -
+								       ret_val)),
+								     "PAP-12107: items must be of the same file");
+								if (is_indirect_le_ih(B_N_PITEM_HEAD(tb->L[0], n + item_pos - ret_val))) {
+									temp_l =
+									    l_n
+									    <<
+									    (tb->
+									     tb_sb->
+									     s_blocksize_bits
+									     -
+									     UNFM_P_SHIFT);
+								}
+								/* update key of first item in S0 */
+								version =
+								    ih_version
+								    (B_N_PITEM_HEAD
+								     (tbS0, 0));
+								set_le_key_k_offset
+								    (version,
+								     B_N_PKEY
+								     (tbS0, 0),
+								     le_key_k_offset
+								     (version,
+								      B_N_PKEY
+								      (tbS0,
+								       0)) +
+								     temp_l);
+								/* update left delimiting key */
+								set_le_key_k_offset
+								    (version,
+								     B_N_PDELIM_KEY
+								     (tb->
+								      CFL[0],
+								      tb->
+								      lkey[0]),
+								     le_key_k_offset
+								     (version,
+								      B_N_PDELIM_KEY
+								      (tb->
+								       CFL[0],
+								       tb->
+								       lkey[0]))
+								     + temp_l);
+							}
+
+							/* Calculate new body, position in item and insert_size[0] */
+							if (l_n > zeros_num) {
+								body +=
+								    (l_n -
+								     zeros_num);
+								zeros_num = 0;
+							} else
+								zeros_num -=
+								    l_n;
+							pos_in_item = 0;
+
+							RFALSE
+							    (comp_short_le_keys
+							     (B_N_PKEY(tbS0, 0),
+							      B_N_PKEY(tb->L[0],
+								       B_NR_ITEMS
+								       (tb->
+									L[0]) -
+								       1))
+							     ||
+							     !op_is_left_mergeable
+							     (B_N_PKEY(tbS0, 0),
+							      tbS0->b_size)
+							     ||
+							     !op_is_left_mergeable
+							     (B_N_PDELIM_KEY
+							      (tb->CFL[0],
+							       tb->lkey[0]),
+							      tbS0->b_size),
+							     "PAP-12120: item must be merge-able with left neighboring item");
+						} else {	/* only part of the appended item will be in L[0] */
+
+							/* Calculate position in item for append in S[0] */
+							pos_in_item -=
+							    tb->lbytes;
+
+							RFALSE(pos_in_item <= 0,
+							       "PAP-12125: no place for paste. pos_in_item=%d",
+							       pos_in_item);
+
+							/* Shift lnum[0] - 1 items in whole. Shift lbytes - 1 byte from item number lnum[0] */
+							leaf_shift_left(tb,
+									tb->
+									lnum[0],
+									tb->
+									lbytes);
+						}
+					}
+				} else {	/* appended item will be in L[0] in whole */
+
+					struct item_head *pasted;
+
+					if (!item_pos && op_is_left_mergeable(B_N_PKEY(tbS0, 0), tbS0->b_size)) {	/* if we paste into first item of S[0] and it is left mergable */
+						/* then increment pos_in_item by the size of the last item in L[0] */
+						pasted =
+						    B_N_PITEM_HEAD(tb->L[0],
+								   n - 1);
+						if (is_direntry_le_ih(pasted))
+							pos_in_item +=
+							    ih_entry_count
+							    (pasted);
+						else
+							pos_in_item +=
+							    ih_item_len(pasted);
+					}
+
+					/* Shift lnum[0] - 1 items in whole. Shift lbytes - 1 byte from item number lnum[0] */
+					ret_val =
+					    leaf_shift_left(tb, tb->lnum[0],
+							    tb->lbytes);
+					/* Append to body of item in L[0] */
+					buffer_info_init_left(tb, &bi);
+					leaf_paste_in_buffer(&bi,
+							     n + item_pos -
+							     ret_val,
+							     pos_in_item,
+							     tb->insert_size[0],
+							     body, zeros_num);
+
+					/* if appended item is directory, paste entry */
+					pasted =
+					    B_N_PITEM_HEAD(tb->L[0],
+							   n + item_pos -
+							   ret_val);
+					if (is_direntry_le_ih(pasted))
+						leaf_paste_entries(&bi,
+								   n +
+								   item_pos -
+								   ret_val,
+								   pos_in_item,
+								   1,
+								   (struct
+								    reiserfs_de_head
+								    *)body,
+								   body +
+								   DEH_SIZE,
+								   tb->
+								   insert_size
+								   [0]
+						    );
+					/* if appended item is indirect item, put unformatted node into un list */
+					if (is_indirect_le_ih(pasted))
+						set_ih_free_space(pasted, 0);
+					tb->insert_size[0] = 0;
+					zeros_num = 0;
+				}
+				break;
+			default:	/* cases d and t */
+				reiserfs_panic(tb->tb_sb, "PAP-12130",
+					       "lnum > 0: unexpected mode: "
+					       " %s(%d)",
+					       (flag ==
+						M_DELETE) ? "DELETE" : ((flag ==
+									 M_CUT)
+									? "CUT"
+									:
+									"UNKNOWN"),
+					       flag);
+			}
+		} else {
+			/* new item doesn't fall into L[0] */
+			leaf_shift_left(tb, tb->lnum[0], tb->lbytes);
+		}
+	}
+
+	/* tb->lnum[0] > 0 */
+	/* Calculate new item position */
+	item_pos -= (tb->lnum[0] - ((tb->lbytes != -1) ? 1 : 0));
+
+	if (tb->rnum[0] > 0) {
+		/* shift rnum[0] items from S[0] to the right neighbor R[0] */
+		n = B_NR_ITEMS(tbS0);
+		switch (flag) {
+
+		case M_INSERT:	/* insert item */
+			if (n - tb->rnum[0] < item_pos) {	/* new item or its part falls to R[0] */
+				if (item_pos == n - tb->rnum[0] + 1 && tb->rbytes != -1) {	/* part of new item falls into R[0] */
+					loff_t old_key_comp, old_len,
+					    r_zeros_number;
+					const char *r_body;
+					int version;
+					loff_t offset;
+
+					leaf_shift_right(tb, tb->rnum[0] - 1,
+							 -1);
+
+					version = ih_version(ih);
+					/* Remember key component and item length */
+					old_key_comp = le_ih_k_offset(ih);
+					old_len = ih_item_len(ih);
+
+					/* Calculate key component and item length to insert into R[0] */
+					offset =
+					    le_ih_k_offset(ih) +
+					    ((old_len -
+					      tb->
+					      rbytes) << (is_indirect_le_ih(ih)
+							  ? tb->tb_sb->
+							  s_blocksize_bits -
+							  UNFM_P_SHIFT : 0));
+					set_le_ih_k_offset(ih, offset);
+					put_ih_item_len(ih, tb->rbytes);
+					/* Insert part of the item into R[0] */
+					buffer_info_init_right(tb, &bi);
+					if ((old_len - tb->rbytes) > zeros_num) {
+						r_zeros_number = 0;
+						r_body =
+						    body + (old_len -
+							    tb->rbytes) -
+						    zeros_num;
+					} else {
+						r_body = body;
+						r_zeros_number =
+						    zeros_num - (old_len -
+								 tb->rbytes);
+						zeros_num -= r_zeros_number;
+					}
+
+					leaf_insert_into_buf(&bi, 0, ih, r_body,
+							     r_zeros_number);
+
+					/* Replace right delimiting key by first key in R[0] */
+					replace_key(tb, tb->CFR[0], tb->rkey[0],
+						    tb->R[0], 0);
+
+					/* Calculate key component and item length to insert into S[0] */
+					set_le_ih_k_offset(ih, old_key_comp);
+					put_ih_item_len(ih,
+							old_len - tb->rbytes);
+
+					tb->insert_size[0] -= tb->rbytes;
+
+				} else {	/* whole new item falls into R[0] */
+
+					/* Shift rnum[0]-1 items to R[0] */
+					ret_val =
+					    leaf_shift_right(tb,
+							     tb->rnum[0] - 1,
+							     tb->rbytes);
+					/* Insert new item into R[0] */
+					buffer_info_init_right(tb, &bi);
+					leaf_insert_into_buf(&bi,
+							     item_pos - n +
+							     tb->rnum[0] - 1,
+							     ih, body,
+							     zeros_num);
+
+					if (item_pos - n + tb->rnum[0] - 1 == 0) {
+						replace_key(tb, tb->CFR[0],
+							    tb->rkey[0],
+							    tb->R[0], 0);
+
+					}
+					zeros_num = tb->insert_size[0] = 0;
+				}
+			} else {	/* new item or part of it doesn't fall into R[0] */
+
+				leaf_shift_right(tb, tb->rnum[0], tb->rbytes);
+			}
+			break;
+
+		case M_PASTE:	/* append item */
+
+			if (n - tb->rnum[0] <= item_pos) {	/* pasted item or part of it falls to R[0] */
+				if (item_pos == n - tb->rnum[0] && tb->rbytes != -1) {	/* we must shift the part of the appended item */
+					if (is_direntry_le_ih(B_N_PITEM_HEAD(tbS0, item_pos))) {	/* we append to directory item */
+						int entry_count;
+
+						RFALSE(zeros_num,
+						       "PAP-12145: invalid parameter in case of a directory");
+						entry_count =
+						    I_ENTRY_COUNT(B_N_PITEM_HEAD
+								  (tbS0,
+								   item_pos));
+						if (entry_count - tb->rbytes <
+						    pos_in_item)
+							/* new directory entry falls into R[0] */
+						{
+							int paste_entry_position;
+
+							RFALSE(tb->rbytes - 1 >=
+							       entry_count
+							       || !tb->
+							       insert_size[0],
+							       "PAP-12150: no enough of entries to shift to R[0]: rbytes=%d, entry_count=%d",
+							       tb->rbytes,
+							       entry_count);
+							/* Shift rnum[0]-1 items in whole. Shift rbytes-1 directory entries from directory item number rnum[0] */
+							leaf_shift_right(tb,
+									 tb->
+									 rnum
+									 [0],
+									 tb->
+									 rbytes
+									 - 1);
+							/* Paste given directory entry to directory item */
+							paste_entry_position =
+							    pos_in_item -
+							    entry_count +
+							    tb->rbytes - 1;
+							buffer_info_init_right(tb, &bi);
+							leaf_paste_in_buffer
+							    (&bi, 0,
+							     paste_entry_position,
+							     tb->insert_size[0],
+							     body, zeros_num);
+							/* paste entry */
+							leaf_paste_entries(&bi,
+									   0,
+									   paste_entry_position,
+									   1,
+									   (struct
+									    reiserfs_de_head
+									    *)
+									   body,
+									   body
+									   +
+									   DEH_SIZE,
+									   tb->
+									   insert_size
+									   [0]
+							    );
+
+							if (paste_entry_position
+							    == 0) {
+								/* change delimiting keys */
+								replace_key(tb,
+									    tb->
+									    CFR
+									    [0],
+									    tb->
+									    rkey
+									    [0],
+									    tb->
+									    R
+									    [0],
+									    0);
+							}
+
+							tb->insert_size[0] = 0;
+							pos_in_item++;
+						} else {	/* new directory entry doesn't fall into R[0] */
+
+							leaf_shift_right(tb,
+									 tb->
+									 rnum
+									 [0],
+									 tb->
+									 rbytes);
+						}
+					} else {	/* regular object */
+
+						int n_shift, n_rem,
+						    r_zeros_number;
+						const char *r_body;
+
+						/* Calculate number of bytes which must be shifted from appended item */
+						if ((n_shift =
+						     tb->rbytes -
+						     tb->insert_size[0]) < 0)
+							n_shift = 0;
+
+						RFALSE(pos_in_item !=
+						       ih_item_len
+						       (B_N_PITEM_HEAD
+							(tbS0, item_pos)),
+						       "PAP-12155: invalid position to paste. ih_item_len=%d, pos_in_item=%d",
+						       pos_in_item,
+						       ih_item_len
+						       (B_N_PITEM_HEAD
+							(tbS0, item_pos)));
+
+						leaf_shift_right(tb,
+								 tb->rnum[0],
+								 n_shift);
+						/* Calculate number of bytes which must remain in body after appending to R[0] */
+						if ((n_rem =
+						     tb->insert_size[0] -
+						     tb->rbytes) < 0)
+							n_rem = 0;
+
+						{
+							int version;
+							unsigned long temp_rem =
+							    n_rem;
+
+							version =
+							    ih_version
+							    (B_N_PITEM_HEAD
+							     (tb->R[0], 0));
+							if (is_indirect_le_key
+							    (version,
+							     B_N_PKEY(tb->R[0],
+								      0))) {
+								temp_rem =
+								    n_rem <<
+								    (tb->tb_sb->
+								     s_blocksize_bits
+								     -
+								     UNFM_P_SHIFT);
+							}
+							set_le_key_k_offset
+							    (version,
+							     B_N_PKEY(tb->R[0],
+								      0),
+							     le_key_k_offset
+							     (version,
+							      B_N_PKEY(tb->R[0],
+								       0)) +
+							     temp_rem);
+							set_le_key_k_offset
+							    (version,
+							     B_N_PDELIM_KEY(tb->
+									    CFR
+									    [0],
+									    tb->
+									    rkey
+									    [0]),
+							     le_key_k_offset
+							     (version,
+							      B_N_PDELIM_KEY
+							      (tb->CFR[0],
+							       tb->rkey[0])) +
+							     temp_rem);
+						}
+/*		  k_offset (B_N_PKEY(tb->R[0],0)) += n_rem;
+		  k_offset (B_N_PDELIM_KEY(tb->CFR[0],tb->rkey[0])) += n_rem;*/
+						do_balance_mark_internal_dirty
+						    (tb, tb->CFR[0], 0);
+
+						/* Append part of body into R[0] */
+						buffer_info_init_right(tb, &bi);
+						if (n_rem > zeros_num) {
+							r_zeros_number = 0;
+							r_body =
+							    body + n_rem -
+							    zeros_num;
+						} else {
+							r_body = body;
+							r_zeros_number =
+							    zeros_num - n_rem;
+							zeros_num -=
+							    r_zeros_number;
+						}
+
+						leaf_paste_in_buffer(&bi, 0,
+								     n_shift,
+								     tb->
+								     insert_size
+								     [0] -
+								     n_rem,
+								     r_body,
+								     r_zeros_number);
+
+						if (is_indirect_le_ih
+						    (B_N_PITEM_HEAD
+						     (tb->R[0], 0))) {
+#if 0
+							RFALSE(n_rem,
+							       "PAP-12160: paste more than one unformatted node pointer");
+#endif
+							set_ih_free_space
+							    (B_N_PITEM_HEAD
+							     (tb->R[0], 0), 0);
+						}
+						tb->insert_size[0] = n_rem;
+						if (!n_rem)
+							pos_in_item++;
+					}
+				} else {	/* pasted item in whole falls into R[0] */
+
+					struct item_head *pasted;
+
+					ret_val =
+					    leaf_shift_right(tb, tb->rnum[0],
+							     tb->rbytes);
+					/* append item in R[0] */
+					if (pos_in_item >= 0) {
+						buffer_info_init_right(tb, &bi);
+						leaf_paste_in_buffer(&bi,
+								     item_pos -
+								     n +
+								     tb->
+								     rnum[0],
+								     pos_in_item,
+								     tb->
+								     insert_size
+								     [0], body,
+								     zeros_num);
+					}
+
+					/* paste new entry, if item is directory item */
+					pasted =
+					    B_N_PITEM_HEAD(tb->R[0],
+							   item_pos - n +
+							   tb->rnum[0]);
+					if (is_direntry_le_ih(pasted)
+					    && pos_in_item >= 0) {
+						leaf_paste_entries(&bi,
+								   item_pos -
+								   n +
+								   tb->rnum[0],
+								   pos_in_item,
+								   1,
+								   (struct
+								    reiserfs_de_head
+								    *)body,
+								   body +
+								   DEH_SIZE,
+								   tb->
+								   insert_size
+								   [0]
+						    );
+						if (!pos_in_item) {
+
+							RFALSE(item_pos - n +
+							       tb->rnum[0],
+							       "PAP-12165: directory item must be first item of node when pasting is in 0th position");
+
+							/* update delimiting keys */
+							replace_key(tb,
+								    tb->CFR[0],
+								    tb->rkey[0],
+								    tb->R[0],
+								    0);
+						}
+					}
+
+					if (is_indirect_le_ih(pasted))
+						set_ih_free_space(pasted, 0);
+					zeros_num = tb->insert_size[0] = 0;
+				}
+			} else {	/* new item doesn't fall into R[0] */
+
+				leaf_shift_right(tb, tb->rnum[0], tb->rbytes);
+			}
+			break;
+		default:	/* cases d and t */
+			reiserfs_panic(tb->tb_sb, "PAP-12175",
+				       "rnum > 0: unexpected mode: %s(%d)",
+				       (flag ==
+					M_DELETE) ? "DELETE" : ((flag ==
+								 M_CUT) ? "CUT"
+								: "UNKNOWN"),
+				       flag);
+		}
+
+	}
+
+	/* tb->rnum[0] > 0 */
+	RFALSE(tb->blknum[0] > 3,
+	       "PAP-12180: blknum can not be %d. It must be <= 3",
+	       tb->blknum[0]);
+	RFALSE(tb->blknum[0] < 0,
+	       "PAP-12185: blknum can not be %d. It must be >= 0",
+	       tb->blknum[0]);
+
+	/* if while adding to a node we discover that it is possible to split
+	   it in two, and merge the left part into the left neighbor and the
+	   right part into the right neighbor, eliminating the node */
+	if (tb->blknum[0] == 0) {	/* node S[0] is empty now */
+
+		RFALSE(!tb->lnum[0] || !tb->rnum[0],
+		       "PAP-12190: lnum and rnum must not be zero");
+		/* if insertion was done before 0-th position in R[0], right
+		   delimiting key of the tb->L[0]'s and left delimiting key are
+		   not set correctly */
+		if (tb->CFL[0]) {
+			if (!tb->CFR[0])
+				reiserfs_panic(tb->tb_sb, "vs-12195",
+					       "CFR not initialized");
+			copy_key(B_N_PDELIM_KEY(tb->CFL[0], tb->lkey[0]),
+				 B_N_PDELIM_KEY(tb->CFR[0], tb->rkey[0]));
+			do_balance_mark_internal_dirty(tb, tb->CFL[0], 0);
+		}
+
+		reiserfs_invalidate_buffer(tb, tbS0);
+		return 0;
+	}
+
+	/* Fill new nodes that appear in place of S[0] */
+
+	/* I am told that this copying is because we need an array to enable
+	   the looping code. -Hans */
+	snum[0] = tb->s1num, snum[1] = tb->s2num;
+	sbytes[0] = tb->s1bytes;
+	sbytes[1] = tb->s2bytes;
+	for (i = tb->blknum[0] - 2; i >= 0; i--) {
+
+		RFALSE(!snum[i], "PAP-12200: snum[%d] == %d. Must be > 0", i,
+		       snum[i]);
+
+		/* here we shift from S to S_new nodes */
+
+		S_new[i] = get_FEB(tb);
+
+		/* initialized block type and tree level */
+		set_blkh_level(B_BLK_HEAD(S_new[i]), DISK_LEAF_NODE_LEVEL);
+
+		n = B_NR_ITEMS(tbS0);
+
+		switch (flag) {
+		case M_INSERT:	/* insert item */
+
+			if (n - snum[i] < item_pos) {	/* new item or it's part falls to first new node S_new[i] */
+				if (item_pos == n - snum[i] + 1 && sbytes[i] != -1) {	/* part of new item falls into S_new[i] */
+					int old_key_comp, old_len,
+					    r_zeros_number;
+					const char *r_body;
+					int version;
+
+					/* Move snum[i]-1 items from S[0] to S_new[i] */
+					leaf_move_items(LEAF_FROM_S_TO_SNEW, tb,
+							snum[i] - 1, -1,
+							S_new[i]);
+					/* Remember key component and item length */
+					version = ih_version(ih);
+					old_key_comp = le_ih_k_offset(ih);
+					old_len = ih_item_len(ih);
+
+					/* Calculate key component and item length to insert into S_new[i] */
+					set_le_ih_k_offset(ih,
+							   le_ih_k_offset(ih) +
+							   ((old_len -
+							     sbytes[i]) <<
+							    (is_indirect_le_ih
+							     (ih) ? tb->tb_sb->
+							     s_blocksize_bits -
+							     UNFM_P_SHIFT :
+							     0)));
+
+					put_ih_item_len(ih, sbytes[i]);
+
+					/* Insert part of the item into S_new[i] before 0-th item */
+					buffer_info_init_bh(tb, &bi, S_new[i]);
+
+					if ((old_len - sbytes[i]) > zeros_num) {
+						r_zeros_number = 0;
+						r_body =
+						    body + (old_len -
+							    sbytes[i]) -
+						    zeros_num;
+					} else {
+						r_body = body;
+						r_zeros_number =
+						    zeros_num - (old_len -
+								 sbytes[i]);
+						zeros_num -= r_zeros_number;
+					}
+
+					leaf_insert_into_buf(&bi, 0, ih, r_body,
+							     r_zeros_number);
+
+					/* Calculate key component and item length to insert into S[i] */
+					set_le_ih_k_offset(ih, old_key_comp);
+					put_ih_item_len(ih,
+							old_len - sbytes[i]);
+					tb->insert_size[0] -= sbytes[i];
+				} else {	/* whole new item falls into S_new[i] */
+
+					/* Shift snum[0] - 1 items to S_new[i] (sbytes[i] of split item) */
+					leaf_move_items(LEAF_FROM_S_TO_SNEW, tb,
+							snum[i] - 1, sbytes[i],
+							S_new[i]);
+
+					/* Insert new item into S_new[i] */
+					buffer_info_init_bh(tb, &bi, S_new[i]);
+					leaf_insert_into_buf(&bi,
+							     item_pos - n +
+							     snum[i] - 1, ih,
+							     body, zeros_num);
+
+					zeros_num = tb->insert_size[0] = 0;
+				}
+			}
+
+			else {	/* new item or it part don't falls into S_new[i] */
+
+				leaf_move_items(LEAF_FROM_S_TO_SNEW, tb,
+						snum[i], sbytes[i], S_new[i]);
+			}
+			break;
+
+		case M_PASTE:	/* append item */
+
+			if (n - snum[i] <= item_pos) {	/* pasted item or part if it falls to S_new[i] */
+				if (item_pos == n - snum[i] && sbytes[i] != -1) {	/* we must shift part of the appended item */
+					struct item_head *aux_ih;
+
+					RFALSE(ih, "PAP-12210: ih must be 0");
+
+					aux_ih = B_N_PITEM_HEAD(tbS0, item_pos);
+					if (is_direntry_le_ih(aux_ih)) {
+						/* we append to directory item */
+
+						int entry_count;
+
+						entry_count =
+						    ih_entry_count(aux_ih);
+
+						if (entry_count - sbytes[i] <
+						    pos_in_item
+						    && pos_in_item <=
+						    entry_count) {
+							/* new directory entry falls into S_new[i] */
+
+							RFALSE(!tb->
+							       insert_size[0],
+							       "PAP-12215: insert_size is already 0");
+							RFALSE(sbytes[i] - 1 >=
+							       entry_count,
+							       "PAP-12220: there are no so much entries (%d), only %d",
+							       sbytes[i] - 1,
+							       entry_count);
+
+							/* Shift snum[i]-1 items in whole. Shift sbytes[i] directory entries from directory item number snum[i] */
+							leaf_move_items
+							    (LEAF_FROM_S_TO_SNEW,
+							     tb, snum[i],
+							     sbytes[i] - 1,
+							     S_new[i]);
+							/* Paste given directory entry to directory item */
+							buffer_info_init_bh(tb, &bi, S_new[i]);
+							leaf_paste_in_buffer
+							    (&bi, 0,
+							     pos_in_item -
+							     entry_count +
+							     sbytes[i] - 1,
+							     tb->insert_size[0],
+							     body, zeros_num);
+							/* paste new directory entry */
+							leaf_paste_entries(&bi,
+									   0,
+									   pos_in_item
+									   -
+									   entry_count
+									   +
+									   sbytes
+									   [i] -
+									   1, 1,
+									   (struct
+									    reiserfs_de_head
+									    *)
+									   body,
+									   body
+									   +
+									   DEH_SIZE,
+									   tb->
+									   insert_size
+									   [0]
+							    );
+							tb->insert_size[0] = 0;
+							pos_in_item++;
+						} else {	/* new directory entry doesn't fall into S_new[i] */
+							leaf_move_items
+							    (LEAF_FROM_S_TO_SNEW,
+							     tb, snum[i],
+							     sbytes[i],
+							     S_new[i]);
+						}
+					} else {	/* regular object */
+
+						int n_shift, n_rem,
+						    r_zeros_number;
+						const char *r_body;
+
+						RFALSE(pos_in_item !=
+						       ih_item_len
+						       (B_N_PITEM_HEAD
+							(tbS0, item_pos))
+						       || tb->insert_size[0] <=
+						       0,
+						       "PAP-12225: item too short or insert_size <= 0");
+
+						/* Calculate number of bytes which must be shifted from appended item */
+						n_shift =
+						    sbytes[i] -
+						    tb->insert_size[0];
+						if (n_shift < 0)
+							n_shift = 0;
+						leaf_move_items
+						    (LEAF_FROM_S_TO_SNEW, tb,
+						     snum[i], n_shift,
+						     S_new[i]);
+
+						/* Calculate number of bytes which must remain in body after append to S_new[i] */
+						n_rem =
+						    tb->insert_size[0] -
+						    sbytes[i];
+						if (n_rem < 0)
+							n_rem = 0;
+						/* Append part of body into S_new[0] */
+						buffer_info_init_bh(tb, &bi, S_new[i]);
+						if (n_rem > zeros_num) {
+							r_zeros_number = 0;
+							r_body =
+							    body + n_rem -
+							    zeros_num;
+						} else {
+							r_body = body;
+							r_zeros_number =
+							    zeros_num - n_rem;
+							zeros_num -=
+							    r_zeros_number;
+						}
+
+						leaf_paste_in_buffer(&bi, 0,
+								     n_shift,
+								     tb->
+								     insert_size
+								     [0] -
+								     n_rem,
+								     r_body,
+								     r_zeros_number);
+						{
+							struct item_head *tmp;
+
+							tmp =
+							    B_N_PITEM_HEAD(S_new
+									   [i],
+									   0);
+							if (is_indirect_le_ih
+							    (tmp)) {
+								set_ih_free_space
+								    (tmp, 0);
+								set_le_ih_k_offset
+								    (tmp,
+								     le_ih_k_offset
+								     (tmp) +
+								     (n_rem <<
+								      (tb->
+								       tb_sb->
+								       s_blocksize_bits
+								       -
+								       UNFM_P_SHIFT)));
+							} else {
+								set_le_ih_k_offset
+								    (tmp,
+								     le_ih_k_offset
+								     (tmp) +
+								     n_rem);
+							}
+						}
+
+						tb->insert_size[0] = n_rem;
+						if (!n_rem)
+							pos_in_item++;
+					}
+				} else
+					/* item falls wholly into S_new[i] */
+				{
+					int leaf_mi;
+					struct item_head *pasted;
+
+#ifdef CONFIG_REISERFS_CHECK
+					struct item_head *ih_check =
+					    B_N_PITEM_HEAD(tbS0, item_pos);
+
+					if (!is_direntry_le_ih(ih_check)
+					    && (pos_in_item != ih_item_len(ih_check)
+						|| tb->insert_size[0] <= 0))
+						reiserfs_panic(tb->tb_sb,
+							     "PAP-12235",
+							     "pos_in_item "
+							     "must be equal "
+							     "to ih_item_len");
+#endif				/* CONFIG_REISERFS_CHECK */
+
+					leaf_mi =
+					    leaf_move_items(LEAF_FROM_S_TO_SNEW,
+							    tb, snum[i],
+							    sbytes[i],
+							    S_new[i]);
+
+					RFALSE(leaf_mi,
+					       "PAP-12240: unexpected value returned by leaf_move_items (%d)",
+					       leaf_mi);
+
+					/* paste into item */
+					buffer_info_init_bh(tb, &bi, S_new[i]);
+					leaf_paste_in_buffer(&bi,
+							     item_pos - n +
+							     snum[i],
+							     pos_in_item,
+							     tb->insert_size[0],
+							     body, zeros_num);
+
+					pasted =
+					    B_N_PITEM_HEAD(S_new[i],
+							   item_pos - n +
+							   snum[i]);
+					if (is_direntry_le_ih(pasted)) {
+						leaf_paste_entries(&bi,
+								   item_pos -
+								   n + snum[i],
+								   pos_in_item,
+								   1,
+								   (struct
+								    reiserfs_de_head
+								    *)body,
+								   body +
+								   DEH_SIZE,
+								   tb->
+								   insert_size
+								   [0]
+						    );
+					}
+
+					/* if we paste to indirect item update ih_free_space */
+					if (is_indirect_le_ih(pasted))
+						set_ih_free_space(pasted, 0);
+					zeros_num = tb->insert_size[0] = 0;
+				}
+			}
+
+			else {	/* pasted item doesn't fall into S_new[i] */
+
+				leaf_move_items(LEAF_FROM_S_TO_SNEW, tb,
+						snum[i], sbytes[i], S_new[i]);
+			}
+			break;
+		default:	/* cases d and t */
+			reiserfs_panic(tb->tb_sb, "PAP-12245",
+				       "blknum > 2: unexpected mode: %s(%d)",
+				       (flag ==
+					M_DELETE) ? "DELETE" : ((flag ==
+								 M_CUT) ? "CUT"
+								: "UNKNOWN"),
+				       flag);
+		}
+
+		memcpy(insert_key + i, B_N_PKEY(S_new[i], 0), KEY_SIZE);
+		insert_ptr[i] = S_new[i];
+
+		RFALSE(!buffer_journaled(S_new[i])
+		       || buffer_journal_dirty(S_new[i])
+		       || buffer_dirty(S_new[i]), "PAP-12247: S_new[%d] : (%b)",
+		       i, S_new[i]);
+	}
+
+	/* if the affected item was not wholly shifted then we perform all necessary operations on that part or whole of the
+	   affected item which remains in S */
+	if (0 <= item_pos && item_pos < tb->s0num) {	/* if we must insert or append into buffer S[0] */
+
+		switch (flag) {
+		case M_INSERT:	/* insert item into S[0] */
+			buffer_info_init_tbS0(tb, &bi);
+			leaf_insert_into_buf(&bi, item_pos, ih, body,
+					     zeros_num);
+
+			/* If we insert the first key change the delimiting key */
+			if (item_pos == 0) {
+				if (tb->CFL[0])	/* can be 0 in reiserfsck */
+					replace_key(tb, tb->CFL[0], tb->lkey[0],
+						    tbS0, 0);
+
+			}
+			break;
+
+		case M_PASTE:{	/* append item in S[0] */
+				struct item_head *pasted;
+
+				pasted = B_N_PITEM_HEAD(tbS0, item_pos);
+				/* when directory, may be new entry already pasted */
+				if (is_direntry_le_ih(pasted)) {
+					if (pos_in_item >= 0 &&
+					    pos_in_item <=
+					    ih_entry_count(pasted)) {
+
+						RFALSE(!tb->insert_size[0],
+						       "PAP-12260: insert_size is 0 already");
+
+						/* prepare space */
+						buffer_info_init_tbS0(tb, &bi);
+						leaf_paste_in_buffer(&bi,
+								     item_pos,
+								     pos_in_item,
+								     tb->
+								     insert_size
+								     [0], body,
+								     zeros_num);
+
+						/* paste entry */
+						leaf_paste_entries(&bi,
+								   item_pos,
+								   pos_in_item,
+								   1,
+								   (struct
+								    reiserfs_de_head
+								    *)body,
+								   body +
+								   DEH_SIZE,
+								   tb->
+								   insert_size
+								   [0]
+						    );
+						if (!item_pos && !pos_in_item) {
+							RFALSE(!tb->CFL[0]
+							       || !tb->L[0],
+							       "PAP-12270: CFL[0]/L[0] must be specified");
+							if (tb->CFL[0]) {
+								replace_key(tb,
+									    tb->
+									    CFL
+									    [0],
+									    tb->
+									    lkey
+									    [0],
+									    tbS0,
+									    0);
+
+							}
+						}
+						tb->insert_size[0] = 0;
+					}
+				} else {	/* regular object */
+					if (pos_in_item == ih_item_len(pasted)) {
+
+						RFALSE(tb->insert_size[0] <= 0,
+						       "PAP-12275: insert size must not be %d",
+						       tb->insert_size[0]);
+						buffer_info_init_tbS0(tb, &bi);
+						leaf_paste_in_buffer(&bi,
+								     item_pos,
+								     pos_in_item,
+								     tb->
+								     insert_size
+								     [0], body,
+								     zeros_num);
+
+						if (is_indirect_le_ih(pasted)) {
+#if 0
+							RFALSE(tb->
+							       insert_size[0] !=
+							       UNFM_P_SIZE,
+							       "PAP-12280: insert_size for indirect item must be %d, not %d",
+							       UNFM_P_SIZE,
+							       tb->
+							       insert_size[0]);
+#endif
+							set_ih_free_space
+							    (pasted, 0);
+						}
+						tb->insert_size[0] = 0;
+					}
+#ifdef CONFIG_REISERFS_CHECK
+					else {
+						if (tb->insert_size[0]) {
+							print_cur_tb("12285");
+							reiserfs_panic(tb->
+								       tb_sb,
+							    "PAP-12285",
+							    "insert_size "
+							    "must be 0 "
+							    "(%d)",
+							    tb->insert_size[0]);
+						}
+					}
+#endif				/* CONFIG_REISERFS_CHECK */
+
+				}
+			}	/* case M_PASTE: */
+		}
+	}
+#ifdef CONFIG_REISERFS_CHECK
+	if (flag == M_PASTE && tb->insert_size[0]) {
+		print_cur_tb("12290");
+		reiserfs_panic(tb->tb_sb,
+			       "PAP-12290", "insert_size is still not 0 (%d)",
+			       tb->insert_size[0]);
+	}
+#endif				/* CONFIG_REISERFS_CHECK */
+	return 0;
+}				/* Leaf level of the tree is balanced (end of balance_leaf) */
+
+/* Make empty node */
+void make_empty_node(struct buffer_info *bi)
+{
+	struct block_head *blkh;
+
+	RFALSE(bi->bi_bh == NULL, "PAP-12295: pointer to the buffer is NULL");
+
+	blkh = B_BLK_HEAD(bi->bi_bh);
+	set_blkh_nr_item(blkh, 0);
+	set_blkh_free_space(blkh, MAX_CHILD_SIZE(bi->bi_bh));
+
+	if (bi->bi_parent)
+		B_N_CHILD(bi->bi_parent, bi->bi_position)->dc_size = 0;	/* Endian safe if 0 */
+}
+
+/* Get first empty buffer */
+struct buffer_head *get_FEB(struct tree_balance *tb)
+{
+	int i;
+	struct buffer_info bi;
+
+	for (i = 0; i < MAX_FEB_SIZE; i++)
+		if (tb->FEB[i] != NULL)
+			break;
+
+	if (i == MAX_FEB_SIZE)
+		reiserfs_panic(tb->tb_sb, "vs-12300", "FEB list is empty");
+
+	buffer_info_init_bh(tb, &bi, tb->FEB[i]);
+	make_empty_node(&bi);
+	set_buffer_uptodate(tb->FEB[i]);
+	tb->used[i] = tb->FEB[i];
+	tb->FEB[i] = NULL;
+
+	return tb->used[i];
+}
+
+/* This is now used because reiserfs_free_block has to be able to
+** schedule.
+*/
+static void store_thrown(struct tree_balance *tb, struct buffer_head *bh)
+{
+	int i;
+
+	if (buffer_dirty(bh))
+		reiserfs_warning(tb->tb_sb, "reiserfs-12320",
+				 "called with dirty buffer");
+	for (i = 0; i < ARRAY_SIZE(tb->thrown); i++)
+		if (!tb->thrown[i]) {
+			tb->thrown[i] = bh;
+			get_bh(bh);	/* free_thrown puts this */
+			return;
+		}
+	reiserfs_warning(tb->tb_sb, "reiserfs-12321",
+			 "too many thrown buffers");
+}
+
+static void free_thrown(struct tree_balance *tb)
+{
+	int i;
+	b_blocknr_t blocknr;
+	for (i = 0; i < ARRAY_SIZE(tb->thrown); i++) {
+		if (tb->thrown[i]) {
+			blocknr = tb->thrown[i]->b_blocknr;
+			if (buffer_dirty(tb->thrown[i]))
+				reiserfs_warning(tb->tb_sb, "reiserfs-12322",
+						 "called with dirty buffer %d",
+						 blocknr);
+			brelse(tb->thrown[i]);	/* incremented in store_thrown */
+			reiserfs_free_block(tb->transaction_handle, NULL,
+					    blocknr, 0);
+		}
+	}
+}
+
+void reiserfs_invalidate_buffer(struct tree_balance *tb, struct buffer_head *bh)
+{
+	struct block_head *blkh;
+	blkh = B_BLK_HEAD(bh);
+	set_blkh_level(blkh, FREE_LEVEL);
+	set_blkh_nr_item(blkh, 0);
+
+	clear_buffer_dirty(bh);
+	store_thrown(tb, bh);
+}
+
+/* Replace n_dest'th key in buffer dest by n_src'th key of buffer src.*/
+void replace_key(struct tree_balance *tb, struct buffer_head *dest, int n_dest,
+		 struct buffer_head *src, int n_src)
+{
+
+	RFALSE(dest == NULL || src == NULL,
+	       "vs-12305: source or destination buffer is 0 (src=%p, dest=%p)",
+	       src, dest);
+	RFALSE(!B_IS_KEYS_LEVEL(dest),
+	       "vs-12310: invalid level (%z) for destination buffer. dest must be leaf",
+	       dest);
+	RFALSE(n_dest < 0 || n_src < 0,
+	       "vs-12315: src(%d) or dest(%d) key number < 0", n_src, n_dest);
+	RFALSE(n_dest >= B_NR_ITEMS(dest) || n_src >= B_NR_ITEMS(src),
+	       "vs-12320: src(%d(%d)) or dest(%d(%d)) key number is too big",
+	       n_src, B_NR_ITEMS(src), n_dest, B_NR_ITEMS(dest));
+
+	if (B_IS_ITEMS_LEVEL(src))
+		/* source buffer contains leaf node */
+		memcpy(B_N_PDELIM_KEY(dest, n_dest), B_N_PITEM_HEAD(src, n_src),
+		       KEY_SIZE);
+	else
+		memcpy(B_N_PDELIM_KEY(dest, n_dest), B_N_PDELIM_KEY(src, n_src),
+		       KEY_SIZE);
+
+	do_balance_mark_internal_dirty(tb, dest, 0);
+}
+
+int get_left_neighbor_position(struct tree_balance *tb, int h)
+{
+	int Sh_position = PATH_H_POSITION(tb->tb_path, h + 1);
+
+	RFALSE(PATH_H_PPARENT(tb->tb_path, h) == NULL || tb->FL[h] == NULL,
+	       "vs-12325: FL[%d](%p) or F[%d](%p) does not exist",
+	       h, tb->FL[h], h, PATH_H_PPARENT(tb->tb_path, h));
+
+	if (Sh_position == 0)
+		return B_NR_ITEMS(tb->FL[h]);
+	else
+		return Sh_position - 1;
+}
+
+int get_right_neighbor_position(struct tree_balance *tb, int h)
+{
+	int Sh_position = PATH_H_POSITION(tb->tb_path, h + 1);
+
+	RFALSE(PATH_H_PPARENT(tb->tb_path, h) == NULL || tb->FR[h] == NULL,
+	       "vs-12330: F[%d](%p) or FR[%d](%p) does not exist",
+	       h, PATH_H_PPARENT(tb->tb_path, h), h, tb->FR[h]);
+
+	if (Sh_position == B_NR_ITEMS(PATH_H_PPARENT(tb->tb_path, h)))
+		return 0;
+	else
+		return Sh_position + 1;
+}
+
+#ifdef CONFIG_REISERFS_CHECK
+
+int is_reusable(struct super_block *s, b_blocknr_t block, int bit_value);
+static void check_internal_node(struct super_block *s, struct buffer_head *bh,
+				char *mes)
+{
+	struct disk_child *dc;
+	int i;
+
+	RFALSE(!bh, "PAP-12336: bh == 0");
+
+	if (!bh || !B_IS_IN_TREE(bh))
+		return;
+
+	RFALSE(!buffer_dirty(bh) &&
+	       !(buffer_journaled(bh) || buffer_journal_dirty(bh)),
+	       "PAP-12337: buffer (%b) must be dirty", bh);
+	dc = B_N_CHILD(bh, 0);
+
+	for (i = 0; i <= B_NR_ITEMS(bh); i++, dc++) {
+		if (!is_reusable(s, dc_block_number(dc), 1)) {
+			print_cur_tb(mes);
+			reiserfs_panic(s, "PAP-12338",
+				       "invalid child pointer %y in %b",
+				       dc, bh);
+		}
+	}
+}
+
+static int locked_or_not_in_tree(struct tree_balance *tb,
+				  struct buffer_head *bh, char *which)
+{
+	if ((!buffer_journal_prepared(bh) && buffer_locked(bh)) ||
+	    !B_IS_IN_TREE(bh)) {
+		reiserfs_warning(tb->tb_sb, "vs-12339", "%s (%b)", which, bh);
+		return 1;
+	}
+	return 0;
+}
+
+static int check_before_balancing(struct tree_balance *tb)
+{
+	int retval = 0;
+
+	if (REISERFS_SB(tb->tb_sb)->cur_tb) {
+		reiserfs_panic(tb->tb_sb, "vs-12335", "suspect that schedule "
+			       "occurred based on cur_tb not being null at "
+			       "this point in code. do_balance cannot properly "
+			       "handle concurrent tree accesses on a same "
+			       "mount point.");
+	}
+
+	/* double check that buffers that we will modify are unlocked. (fix_nodes should already have
+	   prepped all of these for us). */
+	if (tb->lnum[0]) {
+		retval |= locked_or_not_in_tree(tb, tb->L[0], "L[0]");
+		retval |= locked_or_not_in_tree(tb, tb->FL[0], "FL[0]");
+		retval |= locked_or_not_in_tree(tb, tb->CFL[0], "CFL[0]");
+		check_leaf(tb->L[0]);
+	}
+	if (tb->rnum[0]) {
+		retval |= locked_or_not_in_tree(tb, tb->R[0], "R[0]");
+		retval |= locked_or_not_in_tree(tb, tb->FR[0], "FR[0]");
+		retval |= locked_or_not_in_tree(tb, tb->CFR[0], "CFR[0]");
+		check_leaf(tb->R[0]);
+	}
+	retval |= locked_or_not_in_tree(tb, PATH_PLAST_BUFFER(tb->tb_path),
+					"S[0]");
+	check_leaf(PATH_PLAST_BUFFER(tb->tb_path));
+
+	return retval;
+}
+
+static void check_after_balance_leaf(struct tree_balance *tb)
+{
+	if (tb->lnum[0]) {
+		if (B_FREE_SPACE(tb->L[0]) !=
+		    MAX_CHILD_SIZE(tb->L[0]) -
+		    dc_size(B_N_CHILD
+			    (tb->FL[0], get_left_neighbor_position(tb, 0)))) {
+			print_cur_tb("12221");
+			reiserfs_panic(tb->tb_sb, "PAP-12355",
+				       "shift to left was incorrect");
+		}
+	}
+	if (tb->rnum[0]) {
+		if (B_FREE_SPACE(tb->R[0]) !=
+		    MAX_CHILD_SIZE(tb->R[0]) -
+		    dc_size(B_N_CHILD
+			    (tb->FR[0], get_right_neighbor_position(tb, 0)))) {
+			print_cur_tb("12222");
+			reiserfs_panic(tb->tb_sb, "PAP-12360",
+				       "shift to right was incorrect");
+		}
+	}
+	if (PATH_H_PBUFFER(tb->tb_path, 1) &&
+	    (B_FREE_SPACE(PATH_H_PBUFFER(tb->tb_path, 0)) !=
+	     (MAX_CHILD_SIZE(PATH_H_PBUFFER(tb->tb_path, 0)) -
+	      dc_size(B_N_CHILD(PATH_H_PBUFFER(tb->tb_path, 1),
+				PATH_H_POSITION(tb->tb_path, 1)))))) {
+		int left = B_FREE_SPACE(PATH_H_PBUFFER(tb->tb_path, 0));
+		int right = (MAX_CHILD_SIZE(PATH_H_PBUFFER(tb->tb_path, 0)) -
+			     dc_size(B_N_CHILD(PATH_H_PBUFFER(tb->tb_path, 1),
+					       PATH_H_POSITION(tb->tb_path,
+							       1))));
+		print_cur_tb("12223");
+		reiserfs_warning(tb->tb_sb, "reiserfs-12363",
+				 "B_FREE_SPACE (PATH_H_PBUFFER(tb->tb_path,0)) = %d; "
+				 "MAX_CHILD_SIZE (%d) - dc_size( %y, %d ) [%d] = %d",
+				 left,
+				 MAX_CHILD_SIZE(PATH_H_PBUFFER(tb->tb_path, 0)),
+				 PATH_H_PBUFFER(tb->tb_path, 1),
+				 PATH_H_POSITION(tb->tb_path, 1),
+				 dc_size(B_N_CHILD
+					 (PATH_H_PBUFFER(tb->tb_path, 1),
+					  PATH_H_POSITION(tb->tb_path, 1))),
+				 right);
+		reiserfs_panic(tb->tb_sb, "PAP-12365", "S is incorrect");
+	}
+}
+
+static void check_leaf_level(struct tree_balance *tb)
+{
+	check_leaf(tb->L[0]);
+	check_leaf(tb->R[0]);
+	check_leaf(PATH_PLAST_BUFFER(tb->tb_path));
+}
+
+static void check_internal_levels(struct tree_balance *tb)
+{
+	int h;
+
+	/* check all internal nodes */
+	for (h = 1; tb->insert_size[h]; h++) {
+		check_internal_node(tb->tb_sb, PATH_H_PBUFFER(tb->tb_path, h),
+				    "BAD BUFFER ON PATH");
+		if (tb->lnum[h])
+			check_internal_node(tb->tb_sb, tb->L[h], "BAD L");
+		if (tb->rnum[h])
+			check_internal_node(tb->tb_sb, tb->R[h], "BAD R");
+	}
+
+}
+
+#endif
+
+/* Now we have all of the buffers that must be used in balancing of
+   the tree.  We rely on the assumption that schedule() will not occur
+   while do_balance works. ( Only interrupt handlers are acceptable.)
+   We balance the tree according to the analysis made before this,
+   using buffers already obtained.  For SMP support it will someday be
+   necessary to add ordered locking of tb. */
+
+/* Some interesting rules of balancing:
+
+   we delete a maximum of two nodes per level per balancing: we never
+   delete R, when we delete two of three nodes L, S, R then we move
+   them into R.
+
+   we only delete L if we are deleting two nodes, if we delete only
+   one node we delete S
+
+   if we shift leaves then we shift as much as we can: this is a
+   deliberate policy of extremism in node packing which results in
+   higher average utilization after repeated random balance operations
+   at the cost of more memory copies and more balancing as a result of
+   small insertions to full nodes.
+
+   if we shift internal nodes we try to evenly balance the node
+   utilization, with consequent less balancing at the cost of lower
+   utilization.
+
+   one could argue that the policy for directories in leaves should be
+   that of internal nodes, but we will wait until another day to
+   evaluate this....  It would be nice to someday measure and prove
+   these assumptions as to what is optimal....
+
+*/
+
+static inline void do_balance_starts(struct tree_balance *tb)
+{
+	/* use print_cur_tb() to see initial state of struct
+	   tree_balance */
+
+	/* store_print_tb (tb); */
+
+	/* do not delete, just comment it out */
+/*    print_tb(flag, PATH_LAST_POSITION(tb->tb_path), tb->tb_path->pos_in_item, tb,
+	     "check");*/
+	RFALSE(check_before_balancing(tb), "PAP-12340: locked buffers in TB");
+#ifdef CONFIG_REISERFS_CHECK
+	REISERFS_SB(tb->tb_sb)->cur_tb = tb;
+#endif
+}
+
+static inline void do_balance_completed(struct tree_balance *tb)
+{
+
+#ifdef CONFIG_REISERFS_CHECK
+	check_leaf_level(tb);
+	check_internal_levels(tb);
+	REISERFS_SB(tb->tb_sb)->cur_tb = NULL;
+#endif
+
+	/* reiserfs_free_block is no longer schedule safe.  So, we need to
+	 ** put the buffers we want freed on the thrown list during do_balance,
+	 ** and then free them now
+	 */
+
+	REISERFS_SB(tb->tb_sb)->s_do_balance++;
+
+	/* release all nodes hold to perform the balancing */
+	unfix_nodes(tb);
+
+	free_thrown(tb);
+}
+
+void do_balance(struct tree_balance *tb,	/* tree_balance structure */
+		struct item_head *ih,	/* item header of inserted item */
+		const char *body,	/* body  of inserted item or bytes to paste */
+		int flag)
+{				/* i - insert, d - delete
+				   c - cut, p - paste
+
+				   Cut means delete part of an item
+				   (includes removing an entry from a
+				   directory).
+
+				   Delete means delete whole item.
+
+				   Insert means add a new item into the
+				   tree.
+
+				   Paste means to append to the end of an
+				   existing file or to insert a directory
+				   entry.  */
+	int child_pos,		/* position of a child node in its parent */
+	 h;			/* level of the tree being processed */
+	struct item_head insert_key[2];	/* in our processing of one level
+					   we sometimes determine what
+					   must be inserted into the next
+					   higher level.  This insertion
+					   consists of a key or two keys
+					   and their corresponding
+					   pointers */
+	struct buffer_head *insert_ptr[2];	/* inserted node-ptrs for the next
+						   level */
+
+	tb->tb_mode = flag;
+	tb->need_balance_dirty = 0;
+
+	if (FILESYSTEM_CHANGED_TB(tb)) {
+		reiserfs_panic(tb->tb_sb, "clm-6000", "fs generation has "
+			       "changed");
+	}
+	/* if we have no real work to do  */
+	if (!tb->insert_size[0]) {
+		reiserfs_warning(tb->tb_sb, "PAP-12350",
+				 "insert_size == 0, mode == %c", flag);
+		unfix_nodes(tb);
+		return;
+	}
+
+	atomic_inc(&(fs_generation(tb->tb_sb)));
+	do_balance_starts(tb);
+
+	/* balance leaf returns 0 except if combining L R and S into
+	   one node.  see balance_internal() for explanation of this
+	   line of code. */
+	child_pos = PATH_H_B_ITEM_ORDER(tb->tb_path, 0) +
+	    balance_leaf(tb, ih, body, flag, insert_key, insert_ptr);
+
+#ifdef CONFIG_REISERFS_CHECK
+	check_after_balance_leaf(tb);
+#endif
+
+	/* Balance internal level of the tree. */
+	for (h = 1; h < MAX_HEIGHT && tb->insert_size[h]; h++)
+		child_pos =
+		    balance_internal(tb, h, child_pos, insert_key, insert_ptr);
+
+	do_balance_completed(tb);
+
+}