Btrfs: Add missing hunk from Yan Zheng's cache reclaim patch

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

1 files changed, 1 insertions, 0 deletions

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 37ca8df30c30..4765248000fd 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -1054,6 +1054,7 @@ int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
                         goto out;
                 }
 
+                ref->root_gen = root->root_key.offset;
                 ref->bytenr = buf->start;
                 ref->owner = btrfs_header_owner(buf);
                 ref->generation = btrfs_header_generation(buf);