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rbd: record aggregate image transfer count

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Compute the total number of bytes transferred for an image
request--the sum across each of the request's object requests.
To avoid contention do it only when all object requests are
complete, in rbd_img_request_complete().

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
This commit is contained in:
Alex Elder 2013-04-10 12:34:25 -05:00 committed by Sage Weil
parent a5a337d438
commit 55f27e0931
1 changed files with 18 additions and 0 deletions
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18
drivers/block/rbd.c
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@ -214,6 +214,7 @@ struct rbd_img_request {
spinlock_t completion_lock;/* protects next_completion */
u32 next_completion;
rbd_img_callback_t callback;
u64 xferred;/* aggregate bytes transferred */
int result; /* first nonzero obj_request result */
u32 obj_request_count;
@ -1148,7 +1149,24 @@ static int rbd_obj_request_submit(struct ceph_osd_client *osdc,
static void rbd_img_request_complete(struct rbd_img_request *img_request)
{
dout("%s: img %p\n", __func__, img_request);
/*
* If no error occurred, compute the aggregate transfer
* count for the image request. We could instead use
* atomic64_cmpxchg() to update it as each object request
* completes; not clear which way is better off hand.
*/
if (!img_request->result) {
struct rbd_obj_request *obj_request;
u64 xferred = 0;
for_each_obj_request(img_request, obj_request)
xferred += obj_request->xferred;
img_request->xferred = xferred;
}
if (img_request->callback)
img_request->callback(img_request);
else