Add check for tree-log roots in btrfs_alloc_reserved_extents

Tree log blocks are only reserved, and should not ever get fully
allocated on disk.  This check makes sure they stay out of the
extent tree.

Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 813566acc5d3..558fbe407368 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -2365,6 +2365,9 @@ int btrfs_alloc_reserved_extent(struct btrfs_trans_handle *trans,
                                 struct btrfs_key *ins)
 {
         int ret;
+
+        if (root_objectid == BTRFS_TREE_LOG_OBJECTID)
+                return 0;
         maybe_lock_mutex(root);
         ret = __btrfs_alloc_reserved_extent(trans, root, root_objectid,
                                             ref_generation, owner,