Btrfs: cache extent state when writing out dirty metadata pages

Everytime we write out dirty pages we search for an offset in the tree,
convert the bits in the state, and then when we wait we search for the
offset again and clear the bits.  So for every dirty range in the io tree we
are doing 4 rb searches, which is suboptimal.  With this patch we are only
doing 2 searches for every cycle (modulo weird things happening).  Thanks,

Signed-off-by: Josef Bacik <jbacik@fusionio.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index aa02eab8c40b..c69995556f61 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -3572,7 +3572,7 @@ static int btrfs_destroy_marked_extents(struct btrfs_root *root,
 
         while (1) {
                 ret = find_first_extent_bit(dirty_pages, start, &start, &end,
-                                            mark);
+                                            mark, NULL);
                 if (ret)
                         break;
 
@@ -3627,7 +3627,7 @@ static int btrfs_destroy_pinned_extent(struct btrfs_root *root,
 again:
         while (1) {
                 ret = find_first_extent_bit(unpin, 0, &start, &end,
-                                            EXTENT_DIRTY);
+                                            EXTENT_DIRTY, NULL);
                 if (ret)
                         break;