btrfs: Remove BUG_ON from __btrfs_alloc_chunk()

We BUG_ON() error from add_extent_mapping(), but that error looks pretty
easy to bubble back up - as far as I can tell there have not been any
permanent modifications to fs state at that point.

Signed-off-by: Mark Fasheh <mfasheh@suse.de>

1 files changed, 2 insertions, 1 deletions

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 281ff354f64f..f002973959d0 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -3327,8 +3327,9 @@ static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
         write_lock(&em_tree->lock);
         ret = add_extent_mapping(em_tree, em);
         write_unlock(&em_tree->lock);
-        BUG_ON(ret);
         free_extent_map(em);
+        if (ret)
+                goto error;
 
         ret = btrfs_make_block_group(trans, extent_root, 0, type,
                                      BTRFS_FIRST_CHUNK_TREE_OBJECTID,