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Commit 9691975d authored by Yan's avatar Yan Committed by Chris Mason
Browse files

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: default avatarChris Mason <chris.mason@oracle.com>
parent 1a2b2ac7

fs/btrfs/inode.c

+2 −2
Original line number Diff line number Diff line
@@ -2034,11 +2034,11 @@ static int create_snapshot(struct btrfs_root *root, char *name, int namelen) 
	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)