From 7e2766a1135544a2972d2767f3a41afd5f55067f Mon Sep 17 00:00:00 2001 From: Alex Elder Date: Mon, 25 Mar 2013 18:16:11 -0500 Subject: [PATCH] libceph: send queued requests when starting new one An osd expects the transaction ids of arriving request messages from a given client to a given osd to increase monotonically. So the osd client needs to send its requests in ascending tid order. The transaction id for a request is set at the time it is registered, in __register_request(). This is also where the request gets placed at the end of the osd client's unsent messages list. At the end of ceph_osdc_start_request(), the request message for a newly-mapped osd request is supplied to the messenger to be sent (via __send_request()). If any other messages were present in the osd client's unsent list at that point they would be sent *after* this new request message. Because those unsent messages have already been registered, their tids would be lower than the newly-mapped request message, and sending that message first can violate the tid ordering rule. Rather than sending the new request only, send all queued requests (including the new one) at that point in ceph_osdc_start_request(). This ensures the tid ordering property is preserved. With this in place, all messages should now be sent in tid order regardless of whether they're being sent for the first time or re-sent as a result of a call to osd_reset(). This resolves: http://tracker.ceph.com/issues/4392 Signed-off-by: Alex Elder Reviewed-off-by: Sage Weil --- net/ceph/osd_client.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c index 356f7bc4ae4b..3b6657fe99b1 100644 --- a/net/ceph/osd_client.c +++ b/net/ceph/osd_client.c @@ -1819,7 +1819,7 @@ int ceph_osdc_start_request(struct ceph_osd_client *osdc, dout("send_request %p no up osds in pg\n", req); ceph_monc_request_next_osdmap(&osdc->client->monc); } else { - __send_request(osdc, req); + __send_queued(osdc); } rc = 0; out_unlock: -- 2.20.1