forked from luck/tmp_suning_uos_patched
ceph: avoid block operation when !TASK_RUNNING (ceph_mdsc_close_sessions)
use an atomic variable to track number of sessions, this can avoid block operation inside wait loops. Signed-off-by: Yan, Zheng <zyan@redhat.com>
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c4d4a582c5
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86d8f67b26
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@ -480,6 +480,7 @@ static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc,
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mdsc->max_sessions = newmax;
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}
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mdsc->sessions[mds] = s;
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atomic_inc(&mdsc->num_sessions);
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atomic_inc(&s->s_ref); /* one ref to sessions[], one to caller */
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ceph_con_open(&s->s_con, CEPH_ENTITY_TYPE_MDS, mds,
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@ -503,6 +504,7 @@ static void __unregister_session(struct ceph_mds_client *mdsc,
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mdsc->sessions[s->s_mds] = NULL;
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ceph_con_close(&s->s_con);
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ceph_put_mds_session(s);
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atomic_dec(&mdsc->num_sessions);
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}
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/*
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@ -3328,6 +3330,7 @@ int ceph_mdsc_init(struct ceph_fs_client *fsc)
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init_waitqueue_head(&mdsc->session_close_wq);
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INIT_LIST_HEAD(&mdsc->waiting_for_map);
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mdsc->sessions = NULL;
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atomic_set(&mdsc->num_sessions, 0);
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mdsc->max_sessions = 0;
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mdsc->stopping = 0;
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init_rwsem(&mdsc->snap_rwsem);
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@ -3479,17 +3482,9 @@ void ceph_mdsc_sync(struct ceph_mds_client *mdsc)
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*/
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static bool done_closing_sessions(struct ceph_mds_client *mdsc)
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{
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int i, n = 0;
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if (mdsc->fsc->mount_state == CEPH_MOUNT_SHUTDOWN)
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return true;
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mutex_lock(&mdsc->mutex);
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for (i = 0; i < mdsc->max_sessions; i++)
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if (mdsc->sessions[i])
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n++;
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mutex_unlock(&mdsc->mutex);
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return n == 0;
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return atomic_read(&mdsc->num_sessions) == 0;
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}
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/*
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@ -273,6 +273,7 @@ struct ceph_mds_client {
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struct list_head waiting_for_map;
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struct ceph_mds_session **sessions; /* NULL for mds if no session */
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atomic_t num_sessions;
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int max_sessions; /* len of s_mds_sessions */
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int stopping; /* true if shutting down */
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