reiserfs: balance_leaf refactor, pull out balance_leaf_new_nodes_insert
This patch factors out a new balance_leaf_new_nodes_insert from the code
in balance_leaf responsible for inserting new items into new nodes in
the tree.
It has not been reformatted yet.
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 4dbe0a3..c2c5ba7 100644
--- a/fs/reiserfs/do_balan.c
+++ b/fs/reiserfs/do_balan.c
@@ -733,6 +733,77 @@
}
+static void balance_leaf_new_nodes_insert(struct tree_balance *tb,
+ struct item_head *ih,
+ const char *body,
+ struct item_head *insert_key,
+ struct buffer_head **insert_ptr,
+ int i)
+{
+ struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
+ int n = B_NR_ITEMS(tbS0);
+ struct buffer_info bi;
+ if (n - tb->snum[i] < tb->item_pos) { /* new item or it's part falls to first new node S_new[i] */
+ if (tb->item_pos == n - tb->snum[i] + 1 && tb->sbytes[i] != -1) { /* part of new item falls into S_new[i] */
+ int old_key_comp, old_len, r_zeroes_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,
+ tb->snum[i] - 1, -1,
+ tb->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 - tb->sbytes[i]) << (is_indirect_le_ih(ih) ? tb->tb_sb->s_blocksize_bits - UNFM_P_SHIFT : 0)));
+
+ put_ih_item_len(ih, tb->sbytes[i]);
+
+ /* Insert part of the item into S_new[i] before 0-th item */
+ buffer_info_init_bh(tb, &bi, tb->S_new[i]);
+
+ if ((old_len - tb->sbytes[i]) > tb->zeroes_num) {
+ r_zeroes_number = 0;
+ r_body = body + (old_len - tb->sbytes[i]) - tb->zeroes_num;
+ } else {
+ r_body = body;
+ r_zeroes_number = tb->zeroes_num - (old_len - tb->sbytes[i]);
+ tb->zeroes_num -= r_zeroes_number;
+ }
+
+ leaf_insert_into_buf(&bi, 0, ih, r_body, r_zeroes_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 - tb->sbytes[i]);
+ tb->insert_size[0] -= tb->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,
+ tb->snum[i] - 1, tb->sbytes[i], tb->S_new[i]);
+
+ /* Insert new item into S_new[i] */
+ buffer_info_init_bh(tb, &bi, tb->S_new[i]);
+ leaf_insert_into_buf(&bi, tb->item_pos - n + tb->snum[i] - 1,
+ ih, body, tb->zeroes_num);
+
+ tb->zeroes_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,
+ tb->snum[i], tb->sbytes[i], tb->S_new[i]);
+ }
+}
+
/**
* balance_leaf - reiserfs tree balancing algorithm
* @tb: tree balance state
@@ -877,66 +948,8 @@
switch (flag) {
case M_INSERT: /* insert item */
-
- if (n - tb->snum[i] < tb->item_pos) { /* new item or it's part falls to first new node S_new[i] */
- if (tb->item_pos == n - tb->snum[i] + 1 && tb->sbytes[i] != -1) { /* part of new item falls into S_new[i] */
- int old_key_comp, old_len, r_zeroes_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,
- tb->snum[i] - 1, -1,
- tb->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 - tb->sbytes[i]) << (is_indirect_le_ih(ih) ? tb->tb_sb->s_blocksize_bits - UNFM_P_SHIFT : 0)));
-
- put_ih_item_len(ih, tb->sbytes[i]);
-
- /* Insert part of the item into S_new[i] before 0-th item */
- buffer_info_init_bh(tb, &bi, tb->S_new[i]);
-
- if ((old_len - tb->sbytes[i]) > tb->zeroes_num) {
- r_zeroes_number = 0;
- r_body = body + (old_len - tb->sbytes[i]) - tb->zeroes_num;
- } else {
- r_body = body;
- r_zeroes_number = tb->zeroes_num - (old_len - tb->sbytes[i]);
- tb->zeroes_num -= r_zeroes_number;
- }
-
- leaf_insert_into_buf(&bi, 0, ih, r_body, r_zeroes_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 - tb->sbytes[i]);
- tb->insert_size[0] -= tb->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,
- tb->snum[i] - 1, tb->sbytes[i], tb->S_new[i]);
-
- /* Insert new item into S_new[i] */
- buffer_info_init_bh(tb, &bi, tb->S_new[i]);
- leaf_insert_into_buf(&bi, tb->item_pos - n + tb->snum[i] - 1,
- ih, body, tb->zeroes_num);
-
- tb->zeroes_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,
- tb->snum[i], tb->sbytes[i], tb->S_new[i]);
- }
+ balance_leaf_new_nodes_insert(tb, ih, body, insert_key,
+ insert_ptr, i);
break;
case M_PASTE: /* append item */