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ceph: introduce helper to connect to mds export targets

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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>
This commit is contained in:
Sage Weil 2010-06-21 13:38:25 -07:00
parent 796d6955a5
commit ed0552a1a2
1 changed files with 37 additions and 0 deletions
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37
fs/ceph/mds_client.c
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@ -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
*/