reiserfs: balance_leaf refactor, pull out balance_leaf_insert_left
This patch factors out a new balance_leaf_insert_left from the code in
balance_leaf responsible for inserting new items into the node to
the left of S[0] in the tree.
It is not yet formatted correctly.
Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: Jan Kara <jack@suse.cz>
diff --git a/fs/reiserfs/do_balan.c b/fs/reiserfs/do_balan.c
index 6dbe55f..44eb4f6 100644
--- a/fs/reiserfs/do_balan.c
+++ b/fs/reiserfs/do_balan.c
@@ -290,6 +290,64 @@
return 0;
}
+static void balance_leaf_insert_left(struct tree_balance *tb,
+ struct item_head *ih, const char *body)
+{
+ int ret_val;
+ struct buffer_info bi;
+ int n = B_NR_ITEMS(tb->L[0]);
+
+ if (tb->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 + tb->item_pos - ret_val, ih, body,
+ tb->zeroes_num > ih_item_len(ih) ? ih_item_len(ih) : tb->zeroes_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 > tb->zeroes_num) {
+ body += (tb->lbytes - tb->zeroes_num);
+ tb->zeroes_num = 0;
+ } else
+ tb->zeroes_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 + tb->item_pos - ret_val, ih, body, tb->zeroes_num);
+ tb->insert_size[0] = 0;
+ tb->zeroes_num = 0;
+ }
+
+}
+
/**
* balance_leaf - reiserfs tree balancing algorithm
* @tb: tree balance state
@@ -342,55 +400,7 @@
switch (flag) {
case M_INSERT: /* insert item into L[0] */
-
- if (tb->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 + tb->item_pos - ret_val, ih, body,
- tb->zeroes_num > ih_item_len(ih) ? ih_item_len(ih) : tb->zeroes_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 > tb->zeroes_num) {
- body += (tb->lbytes - tb->zeroes_num);
- tb->zeroes_num = 0;
- } else
- tb->zeroes_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 + tb->item_pos - ret_val, ih, body, tb->zeroes_num);
- tb->insert_size[0] = 0;
- tb->zeroes_num = 0;
- }
+ balance_leaf_insert_left(tb, ih, body);
break;
case M_PASTE: /* append item in L[0] */