diff options
| -rw-r--r-- | net/ceph/osd_client.c | 33 |
1 files changed, 29 insertions, 4 deletions
diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c index 3723a7f16afd..8b84fb4980ba 100644 --- a/net/ceph/osd_client.c +++ b/net/ceph/osd_client.c @@ -570,21 +570,46 @@ static void __kick_osd_requests(struct ceph_osd_client *osdc, struct ceph_osd *osd) { struct ceph_osd_request *req, *nreq; + LIST_HEAD(resend); int err; dout("__kick_osd_requests osd%d\n", osd->o_osd); err = __reset_osd(osdc, osd); if (err) return; - + /* + * Build up a list of requests to resend by traversing the + * osd's list of requests. Requests for a given object are + * sent in tid order, and that is also the order they're + * kept on this list. Therefore all requests that are in + * flight will be found first, followed by all requests that + * have not yet been sent. And to resend requests while + * preserving this order we will want to put any sent + * requests back on the front of the osd client's unsent + * list. + * + * So we build a separate ordered list of already-sent + * requests for the affected osd and splice it onto the + * front of the osd client's unsent list. Once we've seen a + * request that has not yet been sent we're done. Those + * requests are already sitting right where they belong. + */ list_for_each_entry(req, &osd->o_requests, r_osd_item) { - list_move(&req->r_req_lru_item, &osdc->req_unsent); - dout("requeued %p tid %llu osd%d\n", req, req->r_tid, + if (!req->r_sent) + break; + list_move_tail(&req->r_req_lru_item, &resend); + dout("requeueing %p tid %llu osd%d\n", req, req->r_tid, osd->o_osd); if (!req->r_linger) req->r_flags |= CEPH_OSD_FLAG_RETRY; } + list_splice(&resend, &osdc->req_unsent); + /* + * Linger requests are re-registered before sending, which + * sets up a new tid for each. We add them to the unsent + * list at the end to keep things in tid order. + */ list_for_each_entry_safe(req, nreq, &osd->o_linger_requests, r_linger_osd) { /* @@ -593,7 +618,7 @@ static void __kick_osd_requests(struct ceph_osd_client *osdc, */ BUG_ON(!list_empty(&req->r_req_lru_item)); __register_request(osdc, req); - list_add(&req->r_req_lru_item, &osdc->req_unsent); + list_add_tail(&req->r_req_lru_item, &osdc->req_unsent); list_add(&req->r_osd_item, &req->r_osd->o_requests); __unregister_linger_request(osdc, req); dout("requeued lingering %p tid %llu osd%d\n", req, req->r_tid, |