Lines Matching refs:session
54 struct ceph_mds_session *session; member
1149 mds = cap->session->s_mds; in __choose_mds()
1375 struct ceph_mds_session *session) in __open_session() argument
1379 int mds = session->s_mds; in __open_session()
1385 session->s_state = CEPH_MDS_SESSION_OPENING; in __open_session()
1386 session->s_renew_requested = jiffies; in __open_session()
1389 msg = create_session_open_msg(mdsc, session->s_seq); in __open_session()
1392 ceph_con_send(&session->s_con, msg); in __open_session()
1404 struct ceph_mds_session *session; in __open_export_target_session() local
1407 session = __ceph_lookup_mds_session(mdsc, target); in __open_export_target_session()
1408 if (!session) { in __open_export_target_session()
1409 session = register_session(mdsc, target); in __open_export_target_session()
1410 if (IS_ERR(session)) in __open_export_target_session()
1411 return session; in __open_export_target_session()
1413 if (session->s_state == CEPH_MDS_SESSION_NEW || in __open_export_target_session()
1414 session->s_state == CEPH_MDS_SESSION_CLOSING) { in __open_export_target_session()
1415 ret = __open_session(mdsc, session); in __open_export_target_session()
1420 return session; in __open_export_target_session()
1426 struct ceph_mds_session *session; in ceph_mdsc_open_export_target_session() local
1431 session = __open_export_target_session(mdsc, target); in ceph_mdsc_open_export_target_session()
1434 return session; in ceph_mdsc_open_export_target_session()
1438 struct ceph_mds_session *session) in __open_export_target_sessions() argument
1442 int i, mds = session->s_mds; in __open_export_target_sessions()
1449 session->s_mds, mi->num_export_targets); in __open_export_target_sessions()
1458 struct ceph_mds_session *session) in ceph_mdsc_open_export_target_sessions() argument
1461 __open_export_target_sessions(mdsc, session); in ceph_mdsc_open_export_target_sessions()
1469 static void detach_cap_releases(struct ceph_mds_session *session, in detach_cap_releases() argument
1472 lockdep_assert_held(&session->s_cap_lock); in detach_cap_releases()
1474 list_splice_init(&session->s_cap_releases, target); in detach_cap_releases()
1475 session->s_num_cap_releases = 0; in detach_cap_releases()
1476 dout("dispose_cap_releases mds%d\n", session->s_mds); in detach_cap_releases()
1492 struct ceph_mds_session *session) in cleanup_session_requests() argument
1497 dout("cleanup_session_requests mds%d\n", session->s_mds); in cleanup_session_requests()
1499 while (!list_empty(&session->s_unsafe)) { in cleanup_session_requests()
1500 req = list_first_entry(&session->s_unsafe, in cleanup_session_requests()
1516 req->r_session->s_mds == session->s_mds) in cleanup_session_requests()
1528 int ceph_iterate_session_caps(struct ceph_mds_session *session, in ceph_iterate_session_caps() argument
1538 dout("iterate_session_caps %p mds%d\n", session, session->s_mds); in ceph_iterate_session_caps()
1539 spin_lock(&session->s_cap_lock); in ceph_iterate_session_caps()
1540 p = session->s_caps.next; in ceph_iterate_session_caps()
1541 while (p != &session->s_caps) { in ceph_iterate_session_caps()
1548 session->s_cap_iterator = cap; in ceph_iterate_session_caps()
1549 spin_unlock(&session->s_cap_lock); in ceph_iterate_session_caps()
1556 ceph_put_cap(session->s_mdsc, old_cap); in ceph_iterate_session_caps()
1563 spin_lock(&session->s_cap_lock); in ceph_iterate_session_caps()
1568 BUG_ON(cap->session != session); in ceph_iterate_session_caps()
1569 cap->session = NULL; in ceph_iterate_session_caps()
1571 session->s_nr_caps--; in ceph_iterate_session_caps()
1572 atomic64_dec(&session->s_mdsc->metric.total_caps); in ceph_iterate_session_caps()
1574 __ceph_queue_cap_release(session, cap); in ceph_iterate_session_caps()
1583 session->s_cap_iterator = NULL; in ceph_iterate_session_caps()
1584 spin_unlock(&session->s_cap_lock); in ceph_iterate_session_caps()
1588 ceph_put_cap(session->s_mdsc, old_cap); in ceph_iterate_session_caps()
1723 static void remove_session_caps(struct ceph_mds_session *session) in remove_session_caps() argument
1725 struct ceph_fs_client *fsc = session->s_mdsc->fsc; in remove_session_caps()
1729 dout("remove_session_caps on %p\n", session); in remove_session_caps()
1730 ceph_iterate_session_caps(session, remove_session_caps_cb, fsc); in remove_session_caps()
1734 spin_lock(&session->s_cap_lock); in remove_session_caps()
1735 if (session->s_nr_caps > 0) { in remove_session_caps()
1746 while (!list_empty(&session->s_caps)) { in remove_session_caps()
1747 cap = list_entry(session->s_caps.next, in remove_session_caps()
1753 spin_unlock(&session->s_cap_lock); in remove_session_caps()
1758 spin_lock(&session->s_cap_lock); in remove_session_caps()
1763 detach_cap_releases(session, &dispose); in remove_session_caps()
1765 BUG_ON(session->s_nr_caps > 0); in remove_session_caps()
1766 BUG_ON(!list_empty(&session->s_cap_flushing)); in remove_session_caps()
1767 spin_unlock(&session->s_cap_lock); in remove_session_caps()
1768 dispose_cap_releases(session->s_mdsc, &dispose); in remove_session_caps()
1795 if (cap->cap_gen < atomic_read(&cap->session->s_cap_gen)) { in wake_up_session_cb()
1807 static void wake_up_session_caps(struct ceph_mds_session *session, int ev) in wake_up_session_caps() argument
1809 dout("wake_up_session_caps %p mds%d\n", session, session->s_mds); in wake_up_session_caps()
1810 ceph_iterate_session_caps(session, wake_up_session_cb, in wake_up_session_caps()
1821 struct ceph_mds_session *session) in send_renew_caps() argument
1826 if (time_after_eq(jiffies, session->s_cap_ttl) && in send_renew_caps()
1827 time_after_eq(session->s_cap_ttl, session->s_renew_requested)) in send_renew_caps()
1828 pr_info("mds%d caps stale\n", session->s_mds); in send_renew_caps()
1829 session->s_renew_requested = jiffies; in send_renew_caps()
1833 state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds); in send_renew_caps()
1836 session->s_mds, ceph_mds_state_name(state)); in send_renew_caps()
1840 dout("send_renew_caps to mds%d (%s)\n", session->s_mds, in send_renew_caps()
1843 ++session->s_renew_seq); in send_renew_caps()
1846 ceph_con_send(&session->s_con, msg); in send_renew_caps()
1851 struct ceph_mds_session *session, u64 seq) in send_flushmsg_ack() argument
1856 session->s_mds, ceph_session_state_name(session->s_state), seq); in send_flushmsg_ack()
1860 ceph_con_send(&session->s_con, msg); in send_flushmsg_ack()
1871 struct ceph_mds_session *session, int is_renew) in renewed_caps() argument
1876 spin_lock(&session->s_cap_lock); in renewed_caps()
1877 was_stale = is_renew && time_after_eq(jiffies, session->s_cap_ttl); in renewed_caps()
1879 session->s_cap_ttl = session->s_renew_requested + in renewed_caps()
1883 if (time_before(jiffies, session->s_cap_ttl)) { in renewed_caps()
1884 pr_info("mds%d caps renewed\n", session->s_mds); in renewed_caps()
1887 pr_info("mds%d caps still stale\n", session->s_mds); in renewed_caps()
1891 session->s_mds, session->s_cap_ttl, was_stale ? "stale" : "fresh", in renewed_caps()
1892 time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh"); in renewed_caps()
1893 spin_unlock(&session->s_cap_lock); in renewed_caps()
1896 wake_up_session_caps(session, RENEWCAPS); in renewed_caps()
1902 static int request_close_session(struct ceph_mds_session *session) in request_close_session() argument
1907 session->s_mds, ceph_session_state_name(session->s_state), in request_close_session()
1908 session->s_seq); in request_close_session()
1910 session->s_seq); in request_close_session()
1913 ceph_con_send(&session->s_con, msg); in request_close_session()
1921 struct ceph_mds_session *session) in __close_session() argument
1923 if (session->s_state >= CEPH_MDS_SESSION_CLOSING) in __close_session()
1925 session->s_state = CEPH_MDS_SESSION_CLOSING; in __close_session()
1926 return request_close_session(session); in __close_session()
2036 struct ceph_mds_session *session, in ceph_trim_caps() argument
2039 int trim_caps = session->s_nr_caps - max_caps; in ceph_trim_caps()
2042 session->s_mds, session->s_nr_caps, max_caps, trim_caps); in ceph_trim_caps()
2046 ceph_iterate_session_caps(session, trim_caps_cb, &remaining); in ceph_trim_caps()
2048 session->s_mds, session->s_nr_caps, max_caps, in ceph_trim_caps()
2052 ceph_flush_cap_releases(mdsc, session); in ceph_trim_caps()
2096 struct ceph_mds_session *session) in ceph_send_cap_releases() argument
2111 spin_lock(&session->s_cap_lock); in ceph_send_cap_releases()
2113 list_splice_init(&session->s_cap_releases, &tmp_list); in ceph_send_cap_releases()
2114 num_cap_releases = session->s_num_cap_releases; in ceph_send_cap_releases()
2115 session->s_num_cap_releases = 0; in ceph_send_cap_releases()
2116 spin_unlock(&session->s_cap_lock); in ceph_send_cap_releases()
2156 dout("send_cap_releases mds%d %p\n", session->s_mds, msg); in ceph_send_cap_releases()
2157 ceph_con_send(&session->s_con, msg); in ceph_send_cap_releases()
2164 spin_lock(&session->s_cap_lock); in ceph_send_cap_releases()
2165 if (!list_empty(&session->s_cap_releases)) in ceph_send_cap_releases()
2167 spin_unlock(&session->s_cap_lock); in ceph_send_cap_releases()
2176 dout("send_cap_releases mds%d %p\n", session->s_mds, msg); in ceph_send_cap_releases()
2177 ceph_con_send(&session->s_con, msg); in ceph_send_cap_releases()
2182 session->s_mds); in ceph_send_cap_releases()
2183 spin_lock(&session->s_cap_lock); in ceph_send_cap_releases()
2184 list_splice(&tmp_list, &session->s_cap_releases); in ceph_send_cap_releases()
2185 session->s_num_cap_releases += num_cap_releases; in ceph_send_cap_releases()
2186 spin_unlock(&session->s_cap_lock); in ceph_send_cap_releases()
2191 struct ceph_mds_session *session = in ceph_cap_release_work() local
2194 mutex_lock(&session->s_mutex); in ceph_cap_release_work()
2195 if (session->s_state == CEPH_MDS_SESSION_OPEN || in ceph_cap_release_work()
2196 session->s_state == CEPH_MDS_SESSION_HUNG) in ceph_cap_release_work()
2197 ceph_send_cap_releases(session->s_mdsc, session); in ceph_cap_release_work()
2198 mutex_unlock(&session->s_mutex); in ceph_cap_release_work()
2199 ceph_put_mds_session(session); in ceph_cap_release_work()
2203 struct ceph_mds_session *session) in ceph_flush_cap_releases() argument
2208 ceph_get_mds_session(session); in ceph_flush_cap_releases()
2210 &session->s_cap_release_work)) { in ceph_flush_cap_releases()
2213 ceph_put_mds_session(session); in ceph_flush_cap_releases()
2221 void __ceph_queue_cap_release(struct ceph_mds_session *session, in __ceph_queue_cap_release() argument
2224 list_add_tail(&cap->session_caps, &session->s_cap_releases); in __ceph_queue_cap_release()
2225 session->s_num_cap_releases++; in __ceph_queue_cap_release()
2227 if (!(session->s_num_cap_releases % CEPH_CAPS_PER_RELEASE)) in __ceph_queue_cap_release()
2228 ceph_flush_cap_releases(session->s_mdsc, session); in __ceph_queue_cap_release()
2543 static struct ceph_msg *create_request_message(struct ceph_mds_session *session, in create_request_message() argument
2547 int mds = session->s_mds; in create_request_message()
2548 struct ceph_mds_client *mdsc = session->s_mdsc; in create_request_message()
2560 bool legacy = !(session->s_con.peer_features & CEPH_FEATURE_FS_BTIME); in create_request_message()
2727 static int __prepare_send_request(struct ceph_mds_session *session, in __prepare_send_request() argument
2731 int mds = session->s_mds; in __prepare_send_request()
2732 struct ceph_mds_client *mdsc = session->s_mdsc; in __prepare_send_request()
2761 session->s_con.peer_features); in __prepare_send_request()
2787 msg = create_request_message(session, req, drop_cap_releases); in __prepare_send_request()
2795 session->s_con.peer_features); in __prepare_send_request()
2814 static int __send_request(struct ceph_mds_session *session, in __send_request() argument
2820 err = __prepare_send_request(session, req, drop_cap_releases); in __send_request()
2823 ceph_con_send(&session->s_con, req->r_request); in __send_request()
2835 struct ceph_mds_session *session = NULL; in __do_request() local
2891 session = __ceph_lookup_mds_session(mdsc, mds); in __do_request()
2892 if (!session) { in __do_request()
2893 session = register_session(mdsc, mds); in __do_request()
2894 if (IS_ERR(session)) { in __do_request()
2895 err = PTR_ERR(session); in __do_request()
2899 req->r_session = ceph_get_mds_session(session); in __do_request()
2901 dout("do_request mds%d session %p state %s\n", mds, session, in __do_request()
2902 ceph_session_state_name(session->s_state)); in __do_request()
2903 if (session->s_state != CEPH_MDS_SESSION_OPEN && in __do_request()
2904 session->s_state != CEPH_MDS_SESSION_HUNG) { in __do_request()
2920 if (session->s_state == CEPH_MDS_SESSION_REJECTED) { in __do_request()
2928 if (session->s_state == CEPH_MDS_SESSION_NEW || in __do_request()
2929 session->s_state == CEPH_MDS_SESSION_CLOSING) { in __do_request()
2930 err = __open_session(mdsc, session); in __do_request()
2937 list_add(&req->r_wait, &session->s_waiting); in __do_request()
2947 err = __send_request(session, req, false); in __do_request()
2950 ceph_put_mds_session(session); in __do_request()
3152 static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg) in handle_reply() argument
3154 struct ceph_mds_client *mdsc = session->s_mdsc; in handle_reply()
3161 int mds = session->s_mds; in handle_reply()
3181 if (req->r_session != session) { in handle_reply()
3183 " not mds%d\n", tid, session->s_mds, in handle_reply()
3263 if (test_bit(CEPHFS_FEATURE_REPLY_ENCODING, &session->s_features)) in handle_reply()
3264 err = parse_reply_info(session, msg, rinfo, (u64)-1); in handle_reply()
3266 err = parse_reply_info(session, msg, rinfo, session->s_con.peer_features); in handle_reply()
3280 mutex_lock(&session->s_mutex); in handle_reply()
3286 mutex_lock(&session->s_mutex); in handle_reply()
3349 mutex_unlock(&session->s_mutex); in handle_reply()
3367 struct ceph_mds_session *session, in handle_forward() argument
3446 static void handle_session(struct ceph_mds_session *session, in handle_session() argument
3449 struct ceph_mds_client *mdsc = session->s_mdsc; in handle_session()
3450 int mds = session->s_mds; in handle_session()
3483 ceph_get_mds_session(session); in handle_session()
3484 __unregister_session(mdsc, session); in handle_session()
3487 session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose; in handle_session()
3490 mutex_lock(&session->s_mutex); in handle_session()
3493 mds, ceph_session_op_name(op), session, in handle_session()
3494 ceph_session_state_name(session->s_state), seq); in handle_session()
3496 if (session->s_state == CEPH_MDS_SESSION_HUNG) { in handle_session()
3497 session->s_state = CEPH_MDS_SESSION_OPEN; in handle_session()
3498 pr_info("mds%d came back\n", session->s_mds); in handle_session()
3503 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING) in handle_session()
3504 pr_info("mds%d reconnect success\n", session->s_mds); in handle_session()
3505 session->s_state = CEPH_MDS_SESSION_OPEN; in handle_session()
3506 session->s_features = features; in handle_session()
3507 renewed_caps(mdsc, session, 0); in handle_session()
3508 if (test_bit(CEPHFS_FEATURE_METRIC_COLLECT, &session->s_features)) in handle_session()
3512 __close_session(mdsc, session); in handle_session()
3516 if (session->s_renew_seq == seq) in handle_session()
3517 renewed_caps(mdsc, session, 1); in handle_session()
3521 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING) in handle_session()
3522 pr_info("mds%d reconnect denied\n", session->s_mds); in handle_session()
3523 session->s_state = CEPH_MDS_SESSION_CLOSED; in handle_session()
3524 cleanup_session_requests(mdsc, session); in handle_session()
3525 remove_session_caps(session); in handle_session()
3532 session->s_mds); in handle_session()
3533 atomic_inc(&session->s_cap_gen); in handle_session()
3534 session->s_cap_ttl = jiffies - 1; in handle_session()
3535 send_renew_caps(mdsc, session); in handle_session()
3539 ceph_trim_caps(mdsc, session, le32_to_cpu(h->max_caps)); in handle_session()
3543 send_flushmsg_ack(mdsc, session, seq); in handle_session()
3547 dout("force_session_readonly %p\n", session); in handle_session()
3548 spin_lock(&session->s_cap_lock); in handle_session()
3549 session->s_readonly = true; in handle_session()
3550 spin_unlock(&session->s_cap_lock); in handle_session()
3551 wake_up_session_caps(session, FORCE_RO); in handle_session()
3555 WARN_ON(session->s_state != CEPH_MDS_SESSION_OPENING); in handle_session()
3556 pr_info("mds%d rejected session\n", session->s_mds); in handle_session()
3557 session->s_state = CEPH_MDS_SESSION_REJECTED; in handle_session()
3558 cleanup_session_requests(mdsc, session); in handle_session()
3559 remove_session_caps(session); in handle_session()
3570 mutex_unlock(&session->s_mutex); in handle_session()
3573 __wake_requests(mdsc, &session->s_waiting); in handle_session()
3579 ceph_put_mds_session(session); in handle_session()
3616 struct ceph_mds_session *session) in replay_unsafe_requests() argument
3621 dout("replay_unsafe_requests mds%d\n", session->s_mds); in replay_unsafe_requests()
3624 list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item) in replay_unsafe_requests()
3625 __send_request(session, req, true); in replay_unsafe_requests()
3641 if (req->r_session->s_mds != session->s_mds) in replay_unsafe_requests()
3646 __send_request(session, req, true); in replay_unsafe_requests()
3712 ceph_con_send(&recon_state->session->s_con, reply); in send_reconnect_partial()
3803 cap->cap_gen = atomic_read(&cap->session->s_cap_gen); in reconnect_caps_cb()
4014 struct ceph_mds_session *session) in send_mds_reconnect() argument
4017 int mds = session->s_mds; in send_mds_reconnect()
4020 .session = session, in send_mds_reconnect()
4034 xa_destroy(&session->s_delegated_inos); in send_mds_reconnect()
4036 mutex_lock(&session->s_mutex); in send_mds_reconnect()
4037 session->s_state = CEPH_MDS_SESSION_RECONNECTING; in send_mds_reconnect()
4038 session->s_seq = 0; in send_mds_reconnect()
4040 dout("session %p state %s\n", session, in send_mds_reconnect()
4041 ceph_session_state_name(session->s_state)); in send_mds_reconnect()
4043 atomic_inc(&session->s_cap_gen); in send_mds_reconnect()
4045 spin_lock(&session->s_cap_lock); in send_mds_reconnect()
4047 session->s_readonly = 0; in send_mds_reconnect()
4053 session->s_cap_reconnect = 1; in send_mds_reconnect()
4055 detach_cap_releases(session, &dispose); in send_mds_reconnect()
4056 spin_unlock(&session->s_cap_lock); in send_mds_reconnect()
4063 ceph_con_close(&session->s_con); in send_mds_reconnect()
4064 ceph_con_open(&session->s_con, in send_mds_reconnect()
4069 replay_unsafe_requests(mdsc, session); in send_mds_reconnect()
4071 ceph_early_kick_flushing_caps(mdsc, session); in send_mds_reconnect()
4080 if (test_bit(CEPHFS_FEATURE_MULTI_RECONNECT, &session->s_features)) { in send_mds_reconnect()
4083 } else if (session->s_con.peer_features & CEPH_FEATURE_MDSENC) { in send_mds_reconnect()
4089 err = ceph_iterate_session_caps(session, reconnect_caps_cb, &recon_state); in send_mds_reconnect()
4091 spin_lock(&session->s_cap_lock); in send_mds_reconnect()
4092 session->s_cap_reconnect = 0; in send_mds_reconnect()
4093 spin_unlock(&session->s_cap_lock); in send_mds_reconnect()
4156 ceph_con_send(&session->s_con, reply); in send_mds_reconnect()
4158 mutex_unlock(&session->s_mutex); in send_mds_reconnect()
4161 __wake_requests(mdsc, &session->s_waiting); in send_mds_reconnect()
4171 mutex_unlock(&session->s_mutex); in send_mds_reconnect()
4360 struct ceph_mds_session *session, in handle_lease() argument
4367 int mds = session->s_mds; in handle_lease()
4393 mutex_lock(&session->s_mutex); in handle_lease()
4394 inc_session_sequence(session); in handle_lease()
4418 if (di->lease_session == session) { in handle_lease()
4427 if (di->lease_session == session && in handle_lease()
4428 di->lease_gen == atomic_read(&session->s_cap_gen) && in handle_lease()
4452 ceph_con_send(&session->s_con, msg); in handle_lease()
4455 mutex_unlock(&session->s_mutex); in handle_lease()
4464 void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session, in ceph_mdsc_lease_send_msg() argument
4474 dentry, ceph_lease_op_name(action), session->s_mds); in ceph_mdsc_lease_send_msg()
4499 ceph_con_send(&session->s_con, msg); in ceph_mdsc_lease_send_msg()
4889 struct ceph_mds_session *session; in ceph_mdsc_close_sessions() local
4898 session = __ceph_lookup_mds_session(mdsc, i); in ceph_mdsc_close_sessions()
4899 if (!session) in ceph_mdsc_close_sessions()
4902 mutex_lock(&session->s_mutex); in ceph_mdsc_close_sessions()
4903 if (__close_session(mdsc, session) <= 0) in ceph_mdsc_close_sessions()
4905 mutex_unlock(&session->s_mutex); in ceph_mdsc_close_sessions()
4906 ceph_put_mds_session(session); in ceph_mdsc_close_sessions()
4920 session = ceph_get_mds_session(mdsc->sessions[i]); in ceph_mdsc_close_sessions()
4921 __unregister_session(mdsc, session); in ceph_mdsc_close_sessions()
4923 mutex_lock(&session->s_mutex); in ceph_mdsc_close_sessions()
4924 remove_session_caps(session); in ceph_mdsc_close_sessions()
4925 mutex_unlock(&session->s_mutex); in ceph_mdsc_close_sessions()
4926 ceph_put_mds_session(session); in ceph_mdsc_close_sessions()
4944 struct ceph_mds_session *session; in ceph_mdsc_force_umount() local
4951 session = __ceph_lookup_mds_session(mdsc, mds); in ceph_mdsc_force_umount()
4952 if (!session) in ceph_mdsc_force_umount()
4955 if (session->s_state == CEPH_MDS_SESSION_REJECTED) in ceph_mdsc_force_umount()
4956 __unregister_session(mdsc, session); in ceph_mdsc_force_umount()
4957 __wake_requests(mdsc, &session->s_waiting); in ceph_mdsc_force_umount()
4960 mutex_lock(&session->s_mutex); in ceph_mdsc_force_umount()
4961 __close_session(mdsc, session); in ceph_mdsc_force_umount()
4962 if (session->s_state == CEPH_MDS_SESSION_CLOSING) { in ceph_mdsc_force_umount()
4963 cleanup_session_requests(mdsc, session); in ceph_mdsc_force_umount()
4964 remove_session_caps(session); in ceph_mdsc_force_umount()
4966 mutex_unlock(&session->s_mutex); in ceph_mdsc_force_umount()
4967 ceph_put_mds_session(session); in ceph_mdsc_force_umount()