rbd: skip the copyup when an entire object writing

It need to copyup the parent's content when layered writing,
but an entire object write would overwrite it, so skip it.

Signed-off-by: Guangliang Zhao <lucienchao@gmail.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Reviewed-by: Alex Elder <elder@linaro.org>
This commit is contained in:
Guangliang Zhao 2014-04-01 22:22:15 +08:00 committed by Ilya Dryomov
parent 70d045f660
commit c622d22615
1 changed files with 8 additions and 0 deletions

View File

@ -2769,6 +2769,14 @@ static bool img_obj_request_simple(struct rbd_obj_request *obj_request)
if (!obj_request_overlaps_parent(obj_request)) if (!obj_request_overlaps_parent(obj_request))
return true; return true;
/*
* Entire-object layered writes - we will overwrite whatever
* parent data there is anyway.
*/
if (!obj_request->offset &&
obj_request->length == rbd_obj_bytes(&rbd_dev->header))
return true;
/* /*
* If the object is known to already exist, its parent data has * If the object is known to already exist, its parent data has
* already been copied. * already been copied.