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[1/2] libceph: add ceph_monc_wait_next_osdmap()

Message ID 1398086776-7228-1-git-send-email-ilya.dryomov@inktank.com (mailing list archive)
State New, archived
Headers show

Commit Message

Ilya Dryomov April 21, 2014, 1:26 p.m. UTC 
Add ceph_monc_wait_next_osdmap(), which will block until the next
requested with ceph_monc_request_next_osdmap() osdmap is received or
timeout occurs.

Export both of these as they are going to be needed by rbd.

Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
---
 include/linux/ceph/mon_client.h |    2 ++
 net/ceph/mon_client.c           |   27 +++++++++++++++++++++++++++
 2 files changed, 29 insertions(+)
diff mbox

Patch

diff --git a/include/linux/ceph/mon_client.h b/include/linux/ceph/mon_client.h
index a486f390dfbe..5444897e8ebd 100644
--- a/include/linux/ceph/mon_client.h
+++ b/include/linux/ceph/mon_client.h
@@ -104,6 +104,8 @@  extern int ceph_monc_got_mdsmap(struct ceph_mon_client *monc, u32 have);
 extern int ceph_monc_got_osdmap(struct ceph_mon_client *monc, u32 have);
 
 extern void ceph_monc_request_next_osdmap(struct ceph_mon_client *monc);
+extern int ceph_monc_wait_next_osdmap(struct ceph_mon_client *monc,
+				      unsigned long timeout);
 
 extern int ceph_monc_do_statfs(struct ceph_mon_client *monc,
 			       struct ceph_statfs *buf);
diff --git a/net/ceph/mon_client.c b/net/ceph/mon_client.c
index 2ac9ef35110b..39953ba83b4c 100644
--- a/net/ceph/mon_client.c
+++ b/net/ceph/mon_client.c
@@ -296,6 +296,33 @@  void ceph_monc_request_next_osdmap(struct ceph_mon_client *monc)
 		__send_subscribe(monc);
 	mutex_unlock(&monc->mutex);
 }
+EXPORT_SYMBOL(ceph_monc_request_next_osdmap);
+
+int ceph_monc_wait_next_osdmap(struct ceph_mon_client *monc,
+			       unsigned long timeout)
+{
+	unsigned long started = jiffies;
+	int ret;
+
+	mutex_lock(&monc->mutex);
+	while (monc->want_next_osdmap != 0) {
+		mutex_unlock(&monc->mutex);
+
+		if (timeout != 0 && time_after_eq(jiffies, started + timeout))
+			return -ETIMEDOUT;
+
+		ret = wait_event_interruptible_timeout(monc->client->auth_wq,
+					monc->want_next_osdmap == 0, timeout);
+		if (ret < 0)
+			return ret;
+
+		mutex_lock(&monc->mutex);
+	}
+
+	mutex_unlock(&monc->mutex);
+	return 0;
+}
+EXPORT_SYMBOL(ceph_monc_wait_next_osdmap);
 
 /*
  *