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authorYan, Zheng <zyan@redhat.com>2015-02-04 14:26:22 +0800
committerIlya Dryomov <idryomov@gmail.com>2015-02-19 13:31:40 +0300
commit3de22be6771353241eaec237fe594dfea3daf30f (patch)
tree3710a3d0bd5c4883a51ed189ad4b763ec4cd82be /fs/ceph
parent2a0b61cefcd52ad63ff03aacae6d4113cdf46812 (diff)
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ceph: re-send requests when MDS enters reconnecting stage
So that MDS can check if any request is already completed and process completed requests in clientreplay stage. When completed requests are processed in clientreplay stage, MDS can avoid sending traceless replies. Signed-off-by: Yan, Zheng <zyan@redhat.com>
Diffstat (limited to 'fs/ceph')
-rw-r--r--fs/ceph/mds_client.c29
1 files changed, 26 insertions, 3 deletions
diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index 03482c0974b6..4c1e36a171af 100644
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -2184,6 +2184,8 @@ static void kick_requests(struct ceph_mds_client *mdsc, int mds)
p = rb_next(p);
if (req->r_got_unsafe)
continue;
+ if (req->r_attempts > 0)
+ continue; /* only new requests */
if (req->r_session &&
req->r_session->s_mds == mds) {
dout(" kicking tid %llu\n", req->r_tid);
@@ -2517,6 +2519,7 @@ static void handle_forward(struct ceph_mds_client *mdsc,
dout("forward tid %llu to mds%d (we resend)\n", tid, next_mds);
BUG_ON(req->r_err);
BUG_ON(req->r_got_result);
+ req->r_attempts = 0;
req->r_num_fwd = fwd_seq;
req->r_resend_mds = next_mds;
put_request_session(req);
@@ -2648,6 +2651,7 @@ static void replay_unsafe_requests(struct ceph_mds_client *mdsc,
struct ceph_mds_session *session)
{
struct ceph_mds_request *req, *nreq;
+ struct rb_node *p;
int err;
dout("replay_unsafe_requests mds%d\n", session->s_mds);
@@ -2660,6 +2664,28 @@ static void replay_unsafe_requests(struct ceph_mds_client *mdsc,
ceph_con_send(&session->s_con, req->r_request);
}
}
+
+ /*
+ * also re-send old requests when MDS enters reconnect stage. So that MDS
+ * can process completed request in clientreplay stage.
+ */
+ p = rb_first(&mdsc->request_tree);
+ while (p) {
+ req = rb_entry(p, struct ceph_mds_request, r_node);
+ p = rb_next(p);
+ if (req->r_got_unsafe)
+ continue;
+ if (req->r_attempts == 0)
+ continue; /* only old requests */
+ if (req->r_session &&
+ req->r_session->s_mds == session->s_mds) {
+ err = __prepare_send_request(mdsc, req, session->s_mds);
+ if (!err) {
+ ceph_msg_get(req->r_request);
+ ceph_con_send(&session->s_con, req->r_request);
+ }
+ }
+ }
mutex_unlock(&mdsc->mutex);
}
@@ -2977,9 +3003,6 @@ static void check_new_map(struct ceph_mds_client *mdsc,
mutex_unlock(&s->s_mutex);
s->s_state = CEPH_MDS_SESSION_RESTARTING;
}
-
- /* kick any requests waiting on the recovering mds */
- kick_requests(mdsc, i);
} else if (oldstate == newstate) {
continue; /* nothing new with this mds */
}