This patch factors out a new balance_leaf_insert_right from the code in
balance_leaf responsible for inserting new items into the node to
the right of S[0] in the tree.
Signed-off-by: Jeff Mahoney <jeffm@xxxxxxxx>
---
fs/reiserfs/do_balan.c | 138 ++++++++++++++++++++++++++-----------------------
1 file changed, 75 insertions(+), 63 deletions(-)
--- a/fs/reiserfs/do_balan.c
+++ b/fs/reiserfs/do_balan.c
@@ -508,6 +508,80 @@ static void balance_leaf_paste_left(stru
}
+static void balance_leaf_insert_right(struct tree_balance *tb,
+ struct item_head *ih, const char *body)
+{
+
+ struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
+ int n = B_NR_ITEMS(tbS0);
+ struct buffer_info bi;
+ int ret_val;
+ if (n - tb->rnum[0] < tb->item_pos) { /* new item or its part falls to R[0] */
+ if (tb->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_zeroes_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) > tb->zeroes_num) {
+ r_zeroes_number = 0;
+ r_body = body + (old_len - tb->rbytes) - tb->zeroes_num;
+ } else {
+ r_body = body;
+ r_zeroes_number = tb->zeroes_num - (old_len - tb->rbytes);
+ tb->zeroes_num -= r_zeroes_number;
+ }
+
+ leaf_insert_into_buf(&bi, 0, ih, r_body,
+ r_zeroes_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, tb->item_pos - n + tb->rnum[0] - 1,
+ ih, body, tb->zeroes_num);
+
+ if (tb->item_pos - n + tb->rnum[0] - 1 == 0) {
+ replace_key(tb, tb->CFR[0],
+ tb->rkey[0],
+ tb->R[0], 0);
+
+ }
+ tb->zeroes_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);
+ }
+
+}
+
/**
* balance_leaf - reiserfs tree balancing algorithm
* @tb: tree balance state
@@ -588,69 +662,7 @@ static int balance_leaf(struct tree_bala
switch (flag) {
case M_INSERT: /* insert item */
- if (n - tb->rnum[0] < tb->item_pos) { /* new item or its part falls to R[0] */
- if (tb->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_zeroes_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) > tb->zeroes_num) {
- r_zeroes_number = 0;
- r_body = body + (old_len - tb->rbytes) - tb->zeroes_num;
- } else {
- r_body = body;
- r_zeroes_number = tb->zeroes_num - (old_len - tb->rbytes);
- tb->zeroes_num -= r_zeroes_number;
- }
-
- leaf_insert_into_buf(&bi, 0, ih, r_body,
- r_zeroes_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, tb->item_pos - n + tb->rnum[0] - 1,
- ih, body, tb->zeroes_num);
-
- if (tb->item_pos - n + tb->rnum[0] - 1 == 0) {
- replace_key(tb, tb->CFR[0],
- tb->rkey[0],
- tb->R[0], 0);
-
- }
- tb->zeroes_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);
- }
+ balance_leaf_insert_right(tb, ih, body);
break;
case M_PASTE: /* append item */
--
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