Btrfs: Make sure to cow the root during a snapshot
Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 7e4cf62..504d37d 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -2096,6 +2096,7 @@
struct btrfs_trans_handle *trans;
struct btrfs_key key;
struct btrfs_root_item new_root_item;
+ struct buffer_head *tmp;
int ret;
int err;
u64 objectid;
@@ -2123,6 +2124,7 @@
key.offset = 1;
key.flags = 0;
btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
+ btrfs_cow_block(trans, root, root->node, NULL, 0, &tmp);
btrfs_set_root_blocknr(&new_root_item, bh_blocknr(root->node));
ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,