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Commit c622d226 authored by Guangliang Zhao's avatar Guangliang Zhao Committed by Ilya Dryomov
Browse files

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: default avatarGuangliang Zhao <lucienchao@gmail.com>
Reviewed-by: default avatarJosh Durgin <josh.durgin@inktank.com>
Reviewed-by: default avatarAlex Elder <elder@linaro.org>
parent 70d045f6

drivers/block/rbd.c

+8 −0
Original line number Diff line number Diff line
@@ -2769,6 +2769,14 @@ static bool img_obj_request_simple(struct rbd_obj_request *obj_request) 
	if (!obj_request_overlaps_parent(obj_request))

		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

	 * already been copied.