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@xxxxxxxxxxx>
---
drivers/block/rbd.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index 69eab66..e8374ae 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -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
--
1.7.9.5
--
To unsubscribe from this list: send the line "unsubscribe ceph-devel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
