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Commit ed0552a1 authored by Sage Weil's avatar Sage Weil
Browse files

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: default avatarSage Weil <sage@newdream.net>
parent 796d6955

fs/ceph/mds_client.c

+37 −0
Original line number Diff line number Diff line
@@ -704,6 +704,43 @@ static int __open_session(struct ceph_mds_client *mdsc, 
	return 0;

}



/*

 * 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

 */