From 2c0d0a10ea89456781218f458f6bf72e99d87d2a Mon Sep 17 00:00:00 2001 From: Alex Elder Date: Tue, 30 Oct 2012 19:40:33 -0500 Subject: [PATCH] rbd: allow null image name We will know the image id for format 2 parent images, but won't initially know its image name. Avoid making the query for an image id in rbd_dev_image_id() if it's already known. Signed-off-by: Alex Elder Reviewed-by: Josh Durgin --- drivers/block/rbd.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c index 8d26c0f2be14..a8521338bf46 100644 --- a/drivers/block/rbd.c +++ b/drivers/block/rbd.c @@ -3067,6 +3067,14 @@ static int rbd_dev_image_id(struct rbd_device *rbd_dev) void *response; void *p; + /* + * When probing a parent image, the image id is already + * known (and the image name likely is not). There's no + * need to fetch the image id again in this case. + */ + if (rbd_dev->spec->image_id) + return 0; + /* * First, see if the format 2 image id file exists, and if * so, get the image's persistent id from it. -- 2.20.1