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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 <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
This commit is contained in:
Alex Elder 2012-10-30 19:40:33 -05:00
parent 83a0626362
commit 2c0d0a10ea
1 changed files with 8 additions and 0 deletions
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8
drivers/block/rbd.c
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@ -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.