Btrfs: start search for new cluster at the beginning

Instead of starting at zero (offset is always zero), request a cluster
starting at search_start, that denotes the beginning of the current
block group.

Signed-off-by: Alexandre Oliva <oliva@lsd.ic.unicamp.br>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 2 insertions, 4 deletions

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index b7e5f6898d07..97c12067a4b0 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -5301,10 +5301,8 @@ alloc:
                         spin_lock(&last_ptr->refill_lock);
                         if (last_ptr->block_group &&
                             (last_ptr->block_group->ro ||
-                            !block_group_bits(last_ptr->block_group, data))) {
-                                offset = 0;
+                            !block_group_bits(last_ptr->block_group, data)))
                                 goto refill_cluster;
-                        }
 
                         offset = btrfs_alloc_from_cluster(block_group, last_ptr,
                                                  num_bytes, search_start);
@@ -5355,7 +5353,7 @@ refill_cluster:
                         /* allocate a cluster in this block group */
                         ret = btrfs_find_space_cluster(trans, root,
                                                block_group, last_ptr,
-                                               offset, num_bytes,
+                                               search_start, num_bytes,
                                                empty_cluster + empty_size);
                         if (ret == 0) {
                                 /*