+static void merge_prev_state(struct extent_io_tree *tree, struct extent_state *state)
+{
+ struct extent_state *prev;
+
+ prev = prev_state(state);
+ if (prev && prev->end == state->start - 1 && prev->state == state->state) {
+ if (tree->inode)
+ btrfs_merge_delalloc_extent(tree->inode, state, prev);
+ state->start = prev->start;
+ rb_erase(&prev->rb_node, &tree->state);
+ RB_CLEAR_NODE(&prev->rb_node);
+ free_extent_state(prev);
+ }
+}
+
+static void merge_next_state(struct extent_io_tree *tree, struct extent_state *state)
+{
+ struct extent_state *next;
+
+ next = next_state(state);
+ if (next && next->start == state->end + 1 && next->state == state->state) {
+ if (tree->inode)
+ btrfs_merge_delalloc_extent(tree->inode, state, next);
+ state->end = next->end;
+ rb_erase(&next->rb_node, &tree->state);
+ RB_CLEAR_NODE(&next->rb_node);
+ free_extent_state(next);
+ }
+}
+