If we span a long area in a bitmap we could end up taking a lot of time
searching to the next free area if we're searching from the original
window_start, so advance window_start in order to make sure we don't do any
superficial searching.  Thanks,

Signed-off-by: Josef Bacik <[email protected]>
---
 fs/btrfs/free-space-cache.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c
index 43e75f2..c2f2059 100644
--- a/fs/btrfs/free-space-cache.c
+++ b/fs/btrfs/free-space-cache.c
@@ -2251,6 +2251,7 @@ u64 btrfs_alloc_from_cluster(struct 
btrfs_block_group_cache *block_group,
                                                 offset_index);
                                continue;
                        }
+                       cluster->window_start += bytes;
                } else {
                        ret = entry->offset;
 
-- 
1.7.5.2

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