Btrfs: Fix buffer get/release issue in create_snapshot
btrfs_cow_block expects a reference to be held on the buffer being cow'd.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 37f8e03..d0af080 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -2034,11 +2034,11 @@
key.objectid = objectid;
key.offset = 1;
btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
-
+ extent_buffer_get(root->node);
btrfs_cow_block(trans, root, root->node, NULL, 0, &tmp);
+ free_extent_buffer(tmp);
btrfs_set_root_bytenr(&new_root_item, root->node->start);
btrfs_set_root_level(&new_root_item, btrfs_header_level(root->node));
-
ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
&new_root_item);
if (ret)