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Commit c2a128d2 authored by Josef Bacik's avatar Josef Bacik Committed by Chris Mason
Browse files

Btrfs: cache extent state in find_delalloc_range 



This patch makes us cache the extent state we find in find_delalloc_range since
we'll have to lock the extent later on in the function.  This will keep us from
re-searching for the rang when we try to lock the extent.

Signed-off-by: default avatarJosef Bacik <josef@redhat.com>
Signed-off-by: default avatarChris Mason <chris.mason@oracle.com>
parent 49958fd7

fs/btrfs/extent_io.c

+8 −3
Original line number Diff line number Diff line
@@ -1171,7 +1171,8 @@ out: 
 * 1 is returned if we find something, 0 if nothing was in the tree

 */

static noinline u64 find_delalloc_range(struct extent_io_tree *tree,

					u64 *start, u64 *end, u64 max_bytes)

					u64 *start, u64 *end, u64 max_bytes,

					struct extent_state **cached_state)

{

	struct rb_node *node;

	struct extent_state *state;
@@ -1203,8 +1204,11 @@ static noinline u64 find_delalloc_range(struct extent_io_tree *tree, 
				*end = state->end;

			goto out;

		}

		if (!found)

		if (!found) {

			*start = state->start;

			*cached_state = state;

			atomic_inc(&state->refs);

		}

		found++;

		*end = state->end;

		cur_start = state->end + 1;
@@ -1336,10 +1340,11 @@ again: 
	delalloc_start = *start;

	delalloc_end = 0;

	found = find_delalloc_range(tree, &delalloc_start, &delalloc_end,

				    max_bytes);

				    max_bytes, &cached_state);

	if (!found || delalloc_end <= *start) {

		*start = delalloc_start;

		*end = delalloc_end;

		free_extent_state(cached_state);

		return found;

	}