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-rw-r--r--ctree.c19
1 files changed, 12 insertions, 7 deletions
diff --git a/ctree.c b/ctree.c
index 184d8422..eb645da9 100644
--- a/ctree.c
+++ b/ctree.c
@@ -27,7 +27,7 @@ static int split_leaf(struct btrfs_trans_handle *trans, struct btrfs_root
struct btrfs_path *path, int data_size, int extend);
static int push_node_left(struct btrfs_trans_handle *trans,
struct btrfs_root *root, struct extent_buffer *dst,
- struct extent_buffer *src);
+ struct extent_buffer *src, int empty);
static int balance_node_right(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct extent_buffer *dst_buf,
@@ -745,7 +745,7 @@ static int balance_level(struct btrfs_trans_handle *trans,
/* first, try to make some room in the middle buffer */
if (left) {
orig_slot += btrfs_header_nritems(left);
- wret = push_node_left(trans, root, left, mid);
+ wret = push_node_left(trans, root, left, mid, 0);
if (wret < 0)
ret = wret;
if (btrfs_header_nritems(mid) < 2)
@@ -756,7 +756,7 @@ static int balance_level(struct btrfs_trans_handle *trans,
* then try to empty the right most buffer into the middle
*/
if (right) {
- wret = push_node_left(trans, root, mid, right);
+ wret = push_node_left(trans, root, mid, right, 1);
if (wret < 0 && wret != -ENOSPC)
ret = wret;
if (btrfs_header_nritems(right) == 0) {
@@ -899,7 +899,7 @@ static int noinline push_nodes_for_insert(struct btrfs_trans_handle *trans,
wret = 1;
else {
wret = push_node_left(trans, root,
- left, mid);
+ left, mid, 0);
}
}
if (wret < 0)
@@ -1200,7 +1200,7 @@ static int fixup_low_keys(struct btrfs_trans_handle *trans,
*/
static int push_node_left(struct btrfs_trans_handle *trans,
struct btrfs_root *root, struct extent_buffer *dst,
- struct extent_buffer *src)
+ struct extent_buffer *src, int empty)
{
int push_items = 0;
int src_nritems;
@@ -1213,12 +1213,17 @@ static int push_node_left(struct btrfs_trans_handle *trans,
WARN_ON(btrfs_header_generation(src) != trans->transid);
WARN_ON(btrfs_header_generation(dst) != trans->transid);
+ if (!empty && src_nritems <= 2)
+ return 1;
+
if (push_items <= 0) {
return 1;
}
- if (src_nritems < push_items)
- push_items = src_nritems;
+ if (empty)
+ push_items = min(src_nritems, push_items);
+ else
+ push_items = min(src_nritems - 2, push_items);
copy_extent_buffer(dst, src,
btrfs_node_key_ptr_offset(dst_nritems),