Btrfs: make sure btrfs_remove_free_space doesn't leak EAGAIN

btrfs_remove_free_space needs to make sure to set ret back to a
valid return value after setting it to EAGAIN, otherwise we return
it to the callers.

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 de205d59b74bbeb7f8389347d2abd9ef6df52705..f49475dfa954a625409322a4c84a157ee3a209ae 100644 (file)
--- a/fs/btrfs/free-space-cache.c
+++ b/fs/btrfs/free-space-cache.c
@@ -1868,6 +1868,7 @@ again:
                        ctl->total_bitmaps--;
                }
                kmem_cache_free(btrfs_free_space_cachep, info);
+               ret = 0;
                goto out_lock;
        }
 
@@ -1875,7 +1876,8 @@ again:
                unlink_free_space(ctl, info);
                info->offset += bytes;
                info->bytes -= bytes;
-               link_free_space(ctl, info);
+               ret = link_free_space(ctl, info);
+               WARN_ON(ret);
                goto out_lock;
        }