ceph: reuse mon subscribe message instead of allocated anew

Use the same message, allocated during startup.  No need to reallocate a
new one each time around (and potentially ENOMEM).

Signed-off-by: Sage Weil <sage@newdream.net>

diff --git a/fs/ceph/mon_client.c b/fs/ceph/mon_client.c
index 12d94f24ee9786f991114ed1c0f8cb01b8b1260c..f6510a476e7e3cbf57a0a6b59920e9bdc0835d54 100644 (file)
--- a/fs/ceph/mon_client.c
+++ b/fs/ceph/mon_client.c
@@ -188,16 +188,12 @@ static void __send_subscribe(struct ceph_mon_client *monc)
             monc->want_next_osdmap);
        if ((__sub_expired(monc) && !monc->sub_sent) ||
            monc->want_next_osdmap == 1) {
-               struct ceph_msg *msg;
+               struct ceph_msg *msg = monc->m_subscribe;
                struct ceph_mon_subscribe_item *i;
                void *p, *end;
 
-               msg = ceph_msg_new(CEPH_MSG_MON_SUBSCRIBE, 96, GFP_NOFS);
-               if (!msg)
-                       return;
-
                p = msg->front.iov_base;
-               end = p + msg->front.iov_len;
+               end = p + msg->front_max;
 
                dout("__send_subscribe to 'mdsmap' %u+\n",
                     (unsigned)monc->have_mdsmap);
@@ -227,7 +223,8 @@ static void __send_subscribe(struct ceph_mon_client *monc)
 
                msg->front.iov_len = p - msg->front.iov_base;
                msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
-               ceph_con_send(monc->con, msg);
+               ceph_con_revoke(monc->con, msg);
+               ceph_con_send(monc->con, ceph_msg_get(msg));
 
                monc->sub_sent = jiffies | 1;  /* never 0 */
        }
@@ -631,7 +628,7 @@ int ceph_monc_init(struct ceph_mon_client *monc, struct ceph_client *cl)
                CEPH_ENTITY_TYPE_AUTH | CEPH_ENTITY_TYPE_MON |
                CEPH_ENTITY_TYPE_OSD | CEPH_ENTITY_TYPE_MDS;
 
-       /* msg pools */
+       /* msgs */
        err = -ENOMEM;
        monc->m_subscribe_ack = ceph_msg_new(CEPH_MSG_MON_SUBSCRIBE_ACK,
                                     sizeof(struct ceph_mon_subscribe_ack),
@@ -639,9 +636,13 @@ int ceph_monc_init(struct ceph_mon_client *monc, struct ceph_client *cl)
        if (!monc->m_subscribe_ack)
                goto out_monmap;
 
+       monc->m_subscribe = ceph_msg_new(CEPH_MSG_MON_SUBSCRIBE, 96, GFP_NOFS);
+       if (!monc->m_subscribe)
+               goto out_subscribe_ack;
+
        monc->m_auth_reply = ceph_msg_new(CEPH_MSG_AUTH_REPLY, 4096, GFP_NOFS);
        if (!monc->m_auth_reply)
-               goto out_subscribe_ack;
+               goto out_subscribe;
 
        monc->m_auth = ceph_msg_new(CEPH_MSG_AUTH, 4096, GFP_NOFS);
        monc->pending_auth = 0;
@@ -665,6 +666,8 @@ int ceph_monc_init(struct ceph_mon_client *monc, struct ceph_client *cl)
 
 out_auth_reply:
        ceph_msg_put(monc->m_auth_reply);
+out_subscribe:
+       ceph_msg_put(monc->m_subscribe);
 out_subscribe_ack:
        ceph_msg_put(monc->m_subscribe_ack);
 out_monmap:
@@ -691,6 +694,7 @@ void ceph_monc_stop(struct ceph_mon_client *monc)
 
        ceph_msg_put(monc->m_auth);
        ceph_msg_put(monc->m_auth_reply);
+       ceph_msg_put(monc->m_subscribe);
        ceph_msg_put(monc->m_subscribe_ack);
 
        kfree(monc->monmap);

diff --git a/fs/ceph/mon_client.h b/fs/ceph/mon_client.h
index 76887785a4d7d6f849d67f526ae72c1e4429120c..174d794321d0af7cf709e4ff7395fedc381aba81 100644 (file)
--- a/fs/ceph/mon_client.h
+++ b/fs/ceph/mon_client.h
@@ -63,7 +63,7 @@ struct ceph_mon_client {
        struct delayed_work delayed_work;
 
        struct ceph_auth_client *auth;
-       struct ceph_msg *m_auth, *m_auth_reply, *m_subscribe_ack;
+       struct ceph_msg *m_auth, *m_auth_reply, *m_subscribe, *m_subscribe_ack;
        int pending_auth;
 
        bool hunting;