Btrfs: use cluster->window_start when allocating from a cluster bitmap

We specifically set window_start in the cluster struct to indicate where the
cluster starts in a bitmap, but we've been using min_start to indicate where
we're searching from.  This is usually the start of the blockgroup, so
essentially means we're constantly searching from the start of any bitmap we
find, which completely negates all the trouble we go to in order to setup a
cluster.  So start using window_start to make sure we actually use the area we
found.  Thanks,

Signed-off-by: Josef Bacik <josef@redhat.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c
index 6e7406932341b93dd0204526260b435cc5cb1d9b..61447a51f6455937e7c40543e8a1e51151b88467 100644 (file)
--- a/fs/btrfs/free-space-cache.c
+++ b/fs/btrfs/free-space-cache.c
@@ -2242,7 +2242,7 @@ u64 btrfs_alloc_from_cluster(struct btrfs_block_group_cache *block_group,
                if (entry->bitmap) {
                        ret = btrfs_alloc_from_bitmap(block_group,
                                                      cluster, entry, bytes,
-                                                     min_start);
+                                                     cluster->window_start);
                        if (ret == 0) {
                                node = rb_next(&entry->offset_index);
                                if (!node)