Btrfs: node balance optimizations

Signed-off-by: Chris Mason <chris.mason@oracle.com>

diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 744fd72..1bae035 100644 (file)
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -151,11 +151,6 @@ static int check_node(struct btrfs_root *root, struct btrfs_path *path,
        for (i = 0; nritems > 1 && i < nritems - 2; i++) {
                struct btrfs_key cpukey;
                btrfs_disk_key_to_cpu(&cpukey, &node->ptrs[i + 1].key);
-if (comp_keys(&node->ptrs[i].key, &cpukey) >= 0) {
-       struct btrfs_key bad;
-       btrfs_disk_key_to_cpu(&bad, &node->ptrs[i].key);
-printk("check_node level %d i is %d bad comp %Lu %u %Lu, %Lu %u %Lu\n",level, i, bad.objectid, bad.flags, bad.offset, cpukey.objectid, cpukey.flags, cpukey.offset);
-}
                BUG_ON(comp_keys(&node->ptrs[i].key, &cpukey) >= 0);
        }
        return 0;
@@ -492,11 +487,16 @@ static int push_nodes_for_insert(struct btrfs_trans_handle *trans,
        /* first, try to make some room in the middle buffer */
        if (left_buf) {
                u32 left_nr;
-               btrfs_cow_block(trans, root, left_buf, parent_buf, pslot - 1,
-                               &left_buf);
                left = btrfs_buffer_node(left_buf);
                left_nr = btrfs_header_nritems(&left->header);
-               wret = push_node_left(trans, root, left_buf, mid_buf);
+               if (left_nr >= BTRFS_NODEPTRS_PER_BLOCK(root) - 1) {
+                       wret = 1;
+               } else {
+                       btrfs_cow_block(trans, root, left_buf, parent_buf,
+                                       pslot - 1, &left_buf);
+                       left = btrfs_buffer_node(left_buf);
+                       wret = push_node_left(trans, root, left_buf, mid_buf);
+               }
                if (wret < 0)
                        ret = wret;
                if (wret == 0) {
@@ -528,10 +528,18 @@ static int push_nodes_for_insert(struct btrfs_trans_handle *trans,
         * then try to empty the right most buffer into the middle
         */
        if (right_buf) {
-               btrfs_cow_block(trans, root, right_buf, parent_buf, pslot + 1,
-                               &right_buf);
+               u32 right_nr;
                right = btrfs_buffer_node(right_buf);
-               wret = balance_node_right(trans, root, right_buf, mid_buf);
+               right_nr = btrfs_header_nritems(&right->header);
+               if (right_nr >= BTRFS_NODEPTRS_PER_BLOCK(root) - 1) {
+                       wret = 1;
+               } else {
+                       btrfs_cow_block(trans, root, right_buf,
+                                       parent_buf, pslot + 1, &right_buf);
+                       right = btrfs_buffer_node(right_buf);
+                       wret = balance_node_right(trans, root,
+                                                 right_buf, mid_buf);
+               }
                if (wret < 0)
                        ret = wret;
                if (wret == 0) {