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rbd: add img_obj_request_simple() helper 

To clarify the conditions and make it easier to add new ones.

Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
This commit is contained in:
Ilya Dryomov 2014-09-12 16:02:01 +04:00 committed by Ilya Dryomov
parent 4e752f0ab0
commit 70d045f660
1 changed files with 30 additions and 18 deletions
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48
drivers/block/rbd.c
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@ -2743,11 +2743,10 @@ out:
return ret;
}
static int rbd_img_obj_request_submit(struct rbd_obj_request *obj_request)
static bool img_obj_request_simple(struct rbd_obj_request *obj_request)
{
struct rbd_img_request *img_request;
struct rbd_device *rbd_dev;
bool known;
rbd_assert(obj_request_img_data_test(obj_request));
@ -2755,22 +2754,35 @@ static int rbd_img_obj_request_submit(struct rbd_obj_request *obj_request)
rbd_assert(img_request);
rbd_dev = img_request->rbd_dev;
/*
* Only writes to layered images need special handling.
* Reads and non-layered writes are simple object requests.
* Layered writes that start beyond the end of the overlap
* with the parent have no parent data, so they too are
* simple object requests. Finally, if the target object is
* known to already exist, its parent data has already been
* copied, so a write to the object can also be handled as a
* simple object request.
*/
if (!img_request_write_test(img_request) ||
!img_request_layered_test(img_request) ||
!obj_request_overlaps_parent(obj_request) ||
((known = obj_request_known_test(obj_request)) &&
obj_request_exists_test(obj_request))) {
/* Reads */
if (!img_request_write_test(img_request))
return true;
/* Non-layered writes */
if (!img_request_layered_test(img_request))
return true;
/*
* Layered writes outside of the parent overlap range don't
* share any data with the parent.
*/
if (!obj_request_overlaps_parent(obj_request))
return true;
/*
* If the object is known to already exist, its parent data has
* already been copied.
*/
if (obj_request_known_test(obj_request) &&
obj_request_exists_test(obj_request))
return true;
return false;
}
static int rbd_img_obj_request_submit(struct rbd_obj_request *obj_request)
{
if (img_obj_request_simple(obj_request)) {
struct rbd_device *rbd_dev;
struct ceph_osd_client *osdc;
@ -2786,7 +2798,7 @@ static int rbd_img_obj_request_submit(struct rbd_obj_request *obj_request)
* start by reading the data for the full target object from
* the parent so we can use it for a copyup to the target.
*/
if (known)
if (obj_request_known_test(obj_request))
return rbd_img_obj_parent_read_full(obj_request);
/* We don't know whether the target exists. Go find out. */