ceph: introduce helper to connect to mds export targets
There are a few cases where we need to open sessions with a given mds's
potential export targets.
Signed-off-by: Sage Weil <sage@newdream.net>
diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index 641a8a3..462602e 100644
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -705,6 +705,43 @@
}
/*
+ * open sessions for any export targets for the given mds
+ *
+ * called under mdsc->mutex
+ */
+static void __open_export_target_sessions(struct ceph_mds_client *mdsc,
+ struct ceph_mds_session *session)
+{
+ struct ceph_mds_info *mi;
+ struct ceph_mds_session *ts;
+ int i, mds = session->s_mds;
+ int target;
+
+ if (mds >= mdsc->mdsmap->m_max_mds)
+ return;
+ mi = &mdsc->mdsmap->m_info[mds];
+ dout("open_export_target_sessions for mds%d (%d targets)\n",
+ session->s_mds, mi->num_export_targets);
+
+ for (i = 0; i < mi->num_export_targets; i++) {
+ target = mi->export_targets[i];
+ ts = __ceph_lookup_mds_session(mdsc, target);
+ if (!ts) {
+ ts = register_session(mdsc, target);
+ if (IS_ERR(ts))
+ return;
+ }
+ if (session->s_state == CEPH_MDS_SESSION_NEW ||
+ session->s_state == CEPH_MDS_SESSION_CLOSING)
+ __open_session(mdsc, session);
+ else
+ dout(" mds%d target mds%d %p is %s\n", session->s_mds,
+ i, ts, session_state_name(ts->s_state));
+ ceph_put_mds_session(ts);
+ }
+}
+
+/*
* session caps
*/