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LU-6655 ptlrpc: skip delayed replay requests
[fs/lustre-release.git] / lustre / ldlm / ldlm_lib.c
index 3726f18..5c122fb 100644 (file)
@@ -23,7 +23,7 @@
  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
  * Use is subject to license terms.
  *
- * Copyright (c) 2010, 2015, Intel Corporation.
+ * Copyright (c) 2010, 2017, Intel Corporation.
  */
 /*
  * This file is part of Lustre, http://www.lustre.org/
 static int import_set_conn(struct obd_import *imp, struct obd_uuid *uuid,
                            int priority, int create)
 {
-        struct ptlrpc_connection *ptlrpc_conn;
-        struct obd_import_conn *imp_conn = NULL, *item;
-        int rc = 0;
-        ENTRY;
+       struct ptlrpc_connection *ptlrpc_conn;
+       struct obd_import_conn *imp_conn = NULL, *item;
+       lnet_nid_t nid4refnet = LNET_NID_ANY;
+       int rc = 0;
+       ENTRY;
 
-        if (!create && !priority) {
-                CDEBUG(D_HA, "Nothing to do\n");
-                RETURN(-EINVAL);
-        }
+       if (!create && !priority) {
+               CDEBUG(D_HA, "Nothing to do\n");
+               RETURN(-EINVAL);
+       }
 
-        ptlrpc_conn = ptlrpc_uuid_to_connection(uuid);
-        if (!ptlrpc_conn) {
-                CDEBUG(D_HA, "can't find connection %s\n", uuid->uuid);
-                RETURN (-ENOENT);
-        }
+       if (imp->imp_connection &&
+           imp->imp_connection->c_remote_uuid.uuid[0] == 0)
+               /* nid4refnet is used to restrict network connections */
+               nid4refnet = imp->imp_connection->c_self;
+       ptlrpc_conn = ptlrpc_uuid_to_connection(uuid, nid4refnet);
+       if (!ptlrpc_conn) {
+               CDEBUG(D_HA, "can't find connection %s\n", uuid->uuid);
+               RETURN(-ENOENT);
+       }
 
-        if (create) {
-                OBD_ALLOC(imp_conn, sizeof(*imp_conn));
-                if (!imp_conn) {
-                        GOTO(out_put, rc = -ENOMEM);
-                }
-        }
+       if (create) {
+               OBD_ALLOC(imp_conn, sizeof(*imp_conn));
+               if (!imp_conn)
+                       GOTO(out_put, rc = -ENOMEM);
+       }
 
        spin_lock(&imp->imp_lock);
        list_for_each_entry(item, &imp->imp_conn_list, oic_item) {
-                if (obd_uuid_equals(uuid, &item->oic_uuid)) {
-                        if (priority) {
+               if (obd_uuid_equals(uuid, &item->oic_uuid)) {
+                       if (priority) {
                                list_del(&item->oic_item);
                                list_add(&item->oic_item,
-                                             &imp->imp_conn_list);
-                                item->oic_last_attempt = 0;
-                        }
-                        CDEBUG(D_HA, "imp %p@%s: found existing conn %s%s\n",
-                               imp, imp->imp_obd->obd_name, uuid->uuid,
-                               (priority ? ", moved to head" : ""));
+                                        &imp->imp_conn_list);
+                               item->oic_last_attempt = 0;
+                       }
+                       CDEBUG(D_HA, "imp %p@%s: found existing conn %s%s\n",
+                              imp, imp->imp_obd->obd_name, uuid->uuid,
+                              (priority ? ", moved to head" : ""));
                        spin_unlock(&imp->imp_lock);
-                        GOTO(out_free, rc = 0);
-                }
-        }
+                       GOTO(out_free, rc = 0);
+               }
+       }
        /* No existing import connection found for \a uuid. */
-        if (create) {
-                imp_conn->oic_conn = ptlrpc_conn;
-                imp_conn->oic_uuid = *uuid;
-                imp_conn->oic_last_attempt = 0;
-                if (priority)
+       if (create) {
+               imp_conn->oic_conn = ptlrpc_conn;
+               imp_conn->oic_uuid = *uuid;
+               imp_conn->oic_last_attempt = 0;
+               if (priority)
                        list_add(&imp_conn->oic_item, &imp->imp_conn_list);
-                else
+               else
                        list_add_tail(&imp_conn->oic_item,
-                                          &imp->imp_conn_list);
-                CDEBUG(D_HA, "imp %p@%s: add connection %s at %s\n",
-                       imp, imp->imp_obd->obd_name, uuid->uuid,
-                       (priority ? "head" : "tail"));
-        } else {
+                                     &imp->imp_conn_list);
+               CDEBUG(D_HA, "imp %p@%s: add connection %s at %s\n",
+                      imp, imp->imp_obd->obd_name, uuid->uuid,
+                      (priority ? "head" : "tail"));
+       } else {
                spin_unlock(&imp->imp_lock);
                GOTO(out_free, rc = -ENOENT);
        }
 
        spin_unlock(&imp->imp_lock);
-        RETURN(0);
+       RETURN(0);
 out_free:
-        if (imp_conn)
-                OBD_FREE(imp_conn, sizeof(*imp_conn));
+       if (imp_conn)
+               OBD_FREE(imp_conn, sizeof(*imp_conn));
 out_put:
-        ptlrpc_connection_put(ptlrpc_conn);
-        RETURN(rc);
+       ptlrpc_connection_put(ptlrpc_conn);
+       RETURN(rc);
 }
 
 int import_set_conn_priority(struct obd_import *imp, struct obd_uuid *uuid)
@@ -256,6 +260,7 @@ static int osc_on_mdt(char *obdname)
  * 1 - client UUID
  * 2 - server UUID
  * 3 - inactive-on-startup
+ * 4 - restrictive net
  */
 int client_obd_setup(struct obd_device *obddev, struct lustre_cfg *lcfg)
 {
@@ -266,6 +271,8 @@ int client_obd_setup(struct obd_device *obddev, struct lustre_cfg *lcfg)
        char *name = obddev->obd_type->typ_name;
        enum ldlm_ns_type ns_type = LDLM_NS_TYPE_UNKNOWN;
        char *cli_name = lustre_cfg_buf(lcfg, 0);
+       struct ptlrpc_connection fake_conn = { .c_self = 0,
+                                              .c_remote_uuid.uuid[0] = 0 };
        int rc;
        ENTRY;
 
@@ -343,10 +350,12 @@ int client_obd_setup(struct obd_device *obddev, struct lustre_cfg *lcfg)
 
        init_rwsem(&cli->cl_sem);
        mutex_init(&cli->cl_mgc_mutex);
-        cli->cl_conn_count = 0;
-        memcpy(server_uuid.uuid, lustre_cfg_buf(lcfg, 2),
-               min_t(unsigned int, LUSTRE_CFG_BUFLEN(lcfg, 2),
-                     sizeof(server_uuid)));
+       cli->cl_seq = NULL;
+       init_rwsem(&cli->cl_seq_rwsem);
+       cli->cl_conn_count = 0;
+       memcpy(server_uuid.uuid, lustre_cfg_buf(lcfg, 2),
+              min_t(unsigned int, LUSTRE_CFG_BUFLEN(lcfg, 2),
+                    sizeof(server_uuid)));
 
        cli->cl_dirty_pages = 0;
        cli->cl_avail_grant = 0;
@@ -382,6 +391,9 @@ int client_obd_setup(struct obd_device *obddev, struct lustre_cfg *lcfg)
        atomic_long_set(&cli->cl_unstable_count, 0);
        INIT_LIST_HEAD(&cli->cl_shrink_list);
 
+       INIT_LIST_HEAD(&cli->cl_flight_waiters);
+       cli->cl_rpcs_in_flight = 0;
+
        init_waitqueue_head(&cli->cl_destroy_waitq);
        atomic_set(&cli->cl_destroy_in_flight, 0);
 #ifdef ENABLE_CHECKSUM
@@ -400,6 +412,8 @@ int client_obd_setup(struct obd_device *obddev, struct lustre_cfg *lcfg)
         * from OFD after connecting. */
        cli->cl_max_pages_per_rpc = PTLRPC_MAX_BRW_PAGES;
 
+       cli->cl_short_io_bytes = OBD_MAX_SHORT_IO_BYTES;
+
        /* set cl_chunkbits default value to PAGE_SHIFT,
         * it will be updated at OSC connection time. */
        cli->cl_chunkbits = PAGE_SHIFT;
@@ -417,7 +431,7 @@ int client_obd_setup(struct obd_device *obddev, struct lustre_cfg *lcfg)
                        cli->cl_max_rpcs_in_flight = OBD_MAX_RIF_MAX;
                else
                        cli->cl_max_rpcs_in_flight = OBD_MAX_RIF_DEFAULT;
-        }
+       }
 
        spin_lock_init(&cli->cl_mod_rpcs_lock);
        spin_lock_init(&cli->cl_mod_rpcs_hist.oh_lock);
@@ -427,6 +441,8 @@ int client_obd_setup(struct obd_device *obddev, struct lustre_cfg *lcfg)
        init_waitqueue_head(&cli->cl_mod_rpcs_waitq);
        cli->cl_mod_tag_bitmap = NULL;
 
+       INIT_LIST_HEAD(&cli->cl_chg_dev_linkage);
+
        if (connect_op == MDS_CONNECT) {
                cli->cl_max_mod_rpcs_in_flight = cli->cl_max_rpcs_in_flight - 1;
                OBD_ALLOC(cli->cl_mod_tag_bitmap,
@@ -453,11 +469,26 @@ int client_obd_setup(struct obd_device *obddev, struct lustre_cfg *lcfg)
                LUSTRE_CFG_BUFLEN(lcfg, 1));
         class_import_put(imp);
 
-        rc = client_import_add_conn(imp, &server_uuid, 1);
-        if (rc) {
-                CERROR("can't add initial connection\n");
-                GOTO(err_import, rc);
-        }
+       if (lustre_cfg_buf(lcfg, 4)) {
+               __u32 refnet = libcfs_str2net(lustre_cfg_string(lcfg, 4));
+
+               if (refnet == LNET_NIDNET(LNET_NID_ANY)) {
+                       rc = -EINVAL;
+                       CERROR("%s: bad mount option 'network=%s': rc = %d\n",
+                              obddev->obd_name, lustre_cfg_string(lcfg, 4),
+                              rc);
+                       GOTO(err_import, rc);
+               }
+               fake_conn.c_self = LNET_MKNID(refnet, 0);
+               imp->imp_connection = &fake_conn;
+       }
+
+       rc = client_import_add_conn(imp, &server_uuid, 1);
+       if (rc) {
+               CERROR("can't add initial connection\n");
+               GOTO(err_import, rc);
+       }
+       imp->imp_connection = NULL;
 
        cli->cl_import = imp;
        /* cli->cl_max_mds_easize updated by mdc_init_ea_size() */
@@ -533,7 +564,6 @@ int client_connect_import(const struct lu_env *env,
        struct obd_connect_data *ocd;
        struct lustre_handle    conn    = { 0 };
        int                     rc;
-       bool                    is_mdc = false;
        ENTRY;
 
        *exp = NULL;
@@ -558,18 +588,12 @@ int client_connect_import(const struct lu_env *env,
        ocd = &imp->imp_connect_data;
        if (data) {
                *ocd = *data;
-               is_mdc = strncmp(imp->imp_obd->obd_type->typ_name,
-                                LUSTRE_MDC_NAME, 3) == 0;
-               if (is_mdc)
-                       data->ocd_connect_flags |= OBD_CONNECT_MULTIMODRPCS;
                imp->imp_connect_flags_orig = data->ocd_connect_flags;
                imp->imp_connect_flags2_orig = data->ocd_connect_flags2;
        }
 
        rc = ptlrpc_connect_import(imp);
        if (rc != 0) {
-               if (data && is_mdc)
-                       data->ocd_connect_flags &= ~OBD_CONNECT_MULTIMODRPCS;
                LASSERT(imp->imp_state == LUSTRE_IMP_DISCON);
                GOTO(out_ldlm, rc);
        }
@@ -580,10 +604,7 @@ int client_connect_import(const struct lu_env *env,
                         ocd->ocd_connect_flags, "old %#llx, new %#llx\n",
                         data->ocd_connect_flags, ocd->ocd_connect_flags);
                data->ocd_connect_flags = ocd->ocd_connect_flags;
-               /* clear the flag as it was not set and is not known
-                * by upper layers */
-               if (is_mdc)
-                       data->ocd_connect_flags &= ~OBD_CONNECT_MULTIMODRPCS;
+               data->ocd_connect_flags2 = ocd->ocd_connect_flags2;
        }
 
        ptlrpc_pinger_add_import(imp);
@@ -701,7 +722,10 @@ int server_disconnect_export(struct obd_export *exp)
                spin_lock(&svcpt->scp_rep_lock);
 
                list_del_init(&rs->rs_exp_list);
+
                spin_lock(&rs->rs_lock);
+               /* clear rs_convert_lock to make sure rs is handled and put */
+               rs->rs_convert_lock = 0;
                ptlrpc_schedule_difficult_reply(rs);
                spin_unlock(&rs->rs_lock);
 
@@ -723,12 +747,12 @@ static int target_handle_reconnect(struct lustre_handle *conn,
 {
        struct obd_device *target;
        struct lustre_handle *hdl;
-       cfs_time_t now;
-       cfs_time_t deadline;
-       int timeout;
+       time64_t deadline;
+       time64_t timeout;
+       time64_t now;
        int rc = 0;
-       ENTRY;
 
+       ENTRY;
        hdl = &exp->exp_imp_reverse->imp_remote_handle;
        if (!exp->exp_connection || !lustre_handle_is_used(hdl)) {
                conn->cookie = exp->exp_handle.h_cookie;
@@ -762,16 +786,16 @@ static int target_handle_reconnect(struct lustre_handle *conn,
                GOTO(out_already, rc);
        }
 
-       now = cfs_time_current();
-       deadline = cfs_timer_deadline(&target->obd_recovery_timer);
-       if (cfs_time_before(now, deadline)) {
-               struct target_distribute_txn_data *tdtd =
-                                       class_exp2tgt(exp)->lut_tdtd;
+       now = ktime_get_seconds();
+       deadline = cfs_duration_sec(target->obd_recovery_timer.expires);
+       if (now < deadline) {
+               struct target_distribute_txn_data *tdtd;
                int size = 0;
                int count = 0;
                char *buf = NULL;
 
-               timeout = cfs_duration_sec(cfs_time_sub(deadline, now));
+               timeout = deadline - now;
+               tdtd = class_exp2tgt(exp)->lut_tdtd;
                if (tdtd && tdtd->tdtd_show_update_logs_retrievers)
                        buf = tdtd->tdtd_show_update_logs_retrievers(
                                tdtd->tdtd_show_retrievers_cbdata,
@@ -779,7 +803,7 @@ static int target_handle_reconnect(struct lustre_handle *conn,
 
                if (count > 0)
                        LCONSOLE_WARN("%s: Recovery already passed deadline "
-                                     "%d:%.02d. It is due to DNE recovery "
+                                     "%lld:%.02lld. It is due to DNE recovery "
                                      "failed/stuck on the %d MDT(s):%s. "
                                      "Please wait until all MDTs recovered "
                                      "or abort the recovery by force.\n",
@@ -788,7 +812,7 @@ static int target_handle_reconnect(struct lustre_handle *conn,
                                      buf ? buf : "unknown (not enough RAM)");
                else
                        LCONSOLE_WARN("%s: Recovery already passed deadline "
-                                     "%d:%.02d. If you do not want to wait "
+                                     "%lld:%.02lld. If you do not want to wait "
                                      "more, please abort the recovery by "
                                      "force.\n", target->obd_name,
                                      timeout / 60, timeout % 60);
@@ -796,9 +820,9 @@ static int target_handle_reconnect(struct lustre_handle *conn,
                if (buf != NULL)
                        OBD_FREE(buf, size);
        } else {
-               timeout = cfs_duration_sec(cfs_time_sub(now, deadline));
+               timeout = now - deadline;
                LCONSOLE_WARN("%s: Recovery already passed deadline"
-                       " %d:%.02d, It is most likely due to DNE"
+                       " %lld:%.02lld, It is most likely due to DNE"
                        " recovery is failed or stuck, please wait a"
                        " few more minutes or abort the recovery.\n",
                        target->obd_name, timeout / 60, timeout % 60);
@@ -812,20 +836,6 @@ out_already:
        RETURN(EALREADY);
 }
 
-void target_client_add_cb(struct obd_device *obd, __u64 transno, void *cb_data,
-                          int error)
-{
-        struct obd_export *exp = cb_data;
-
-        CDEBUG(D_RPCTRACE, "%s: committing for initial connect of %s\n",
-               obd->obd_name, exp->exp_client_uuid.uuid);
-
-       spin_lock(&exp->exp_lock);
-       exp->exp_need_sync = 0;
-       spin_unlock(&exp->exp_lock);
-       class_export_cb_put(exp);
-}
-
 static void
 check_and_start_recovery_timer(struct obd_device *obd,
                                struct ptlrpc_request *req, int new_client);
@@ -946,7 +956,6 @@ int target_handle_connect(struct ptlrpc_request *req)
         * reconnect case */
        struct lustre_handle conn;
        struct lustre_handle *tmp;
-        struct obd_uuid tgtuuid;
         struct obd_uuid cluuid;
         char *str;
         int rc = 0;
@@ -955,7 +964,6 @@ int target_handle_connect(struct ptlrpc_request *req)
        bool     mds_conn = false, lw_client = false, initial_conn = false;
        bool     mds_mds_conn = false;
        bool     new_mds_mds_conn = false;
-       bool     target_referenced = false;
         struct obd_connect_data *data, *tmpdata;
         int size, tmpsize;
         lnet_nid_t *client_nid = NULL;
@@ -969,11 +977,7 @@ int target_handle_connect(struct ptlrpc_request *req)
                 GOTO(out, rc = -EINVAL);
         }
 
-        obd_str2uuid(&tgtuuid, str);
-        target = class_uuid2obd(&tgtuuid);
-        if (!target)
-                target = class_name2obd(str);
-
+       target = class_dev_by_str(str);
        if (!target) {
                deuuidify(str, NULL, &target_start, &target_len);
                LCONSOLE_ERROR_MSG(0x137, "%s: not available for connect "
@@ -985,6 +989,9 @@ int target_handle_connect(struct ptlrpc_request *req)
        }
 
        spin_lock(&target->obd_dev_lock);
+
+       target->obd_conn_inprogress++;
+
        if (target->obd_stopping || !target->obd_set_up) {
                spin_unlock(&target->obd_dev_lock);
 
@@ -1006,13 +1013,6 @@ int target_handle_connect(struct ptlrpc_request *req)
                GOTO(out, rc = -EAGAIN);
        }
 
-       /* Make sure the target isn't cleaned up while we're here. Yes,
-        * there's still a race between the above check and our incref here.
-        * Really, class_uuid2obd should take the ref. */
-       class_incref(target, __func__, current);
-       target_referenced = true;
-
-       target->obd_conn_inprogress++;
        spin_unlock(&target->obd_dev_lock);
 
         str = req_capsule_client_get(&req->rq_pill, &RMF_CLUUID);
@@ -1051,32 +1051,17 @@ int target_handle_connect(struct ptlrpc_request *req)
         */
        if (!(data->ocd_connect_flags & OBD_CONNECT_FULL20))
                GOTO(out, rc = -EPROTO);
-#endif
 
+       /* Don't allow liblustre clients to connect.
+        * - testing was disabled in v2_2_50_0-61-g6a75d65
+        * - building was disabled in v2_5_58_0-28-g7277179
+        * - client code was deleted in v2_6_50_0-101-gcdfbc72,
+        * - clients were refused connect for version difference > 0.0.1.32  */
        if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
-               if (data->ocd_version < LUSTRE_VERSION_CODE -
-                                              LUSTRE_VERSION_ALLOWED_OFFSET ||
-                   data->ocd_version > LUSTRE_VERSION_CODE +
-                                              LUSTRE_VERSION_ALLOWED_OFFSET) {
-                       DEBUG_REQ(D_WARNING, req, "Refusing %s (%d.%d.%d.%d) "
-                                 "libclient connection attempt",
-                                 data->ocd_version < LUSTRE_VERSION_CODE ?
-                                 "old" : "new",
-                                 OBD_OCD_VERSION_MAJOR(data->ocd_version),
-                                 OBD_OCD_VERSION_MINOR(data->ocd_version),
-                                 OBD_OCD_VERSION_PATCH(data->ocd_version),
-                                 OBD_OCD_VERSION_FIX(data->ocd_version));
-                       data = req_capsule_server_sized_get(&req->rq_pill,
-                                                           &RMF_CONNECT_DATA,
-                                   offsetof(typeof(*data), ocd_version) +
-                                            sizeof(data->ocd_version));
-                       if (data) {
-                               data->ocd_connect_flags = OBD_CONNECT_VERSION;
-                               data->ocd_version = LUSTRE_VERSION_CODE;
-                       }
-                       GOTO(out, rc = -EPROTO);
-               }
+               DEBUG_REQ(D_WARNING, req, "Refusing libclient connection");
+               GOTO(out, rc = -EPROTO);
        }
+#endif
 
        /* Note: lw_client is needed in MDS-MDS failover during update log
         * processing, so we needs to allow lw_client to be connected at
@@ -1094,7 +1079,8 @@ int target_handle_connect(struct ptlrpc_request *req)
                 *
                 * Via check OBD_CONNECT_FID, we can distinguish whether
                 * the OBD_CONNECT_MDS_MDS/OBD_CONNECT_MNE_SWAB is from
-                * MGC or MDT. */
+                * MGC or MDT, since MGC does not use OBD_CONNECT_FID.
+                */
                if (!lw_client &&
                    (data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) &&
                    (data->ocd_connect_flags & OBD_CONNECT_FID) &&
@@ -1228,11 +1214,11 @@ no_export:
                 GOTO(out, rc);
         }
 
-       CDEBUG(D_HA, "%s: connection from %s@%s %st%llu exp %p cur %ld last %ld\n",
-               target->obd_name, cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
-              target->obd_recovering ? "recovering/" : "", data->ocd_transno,
-              export, (long)cfs_time_current_sec(),
-              export ? (long)export->exp_last_request_time : 0);
+       CDEBUG(D_HA, "%s: connection from %s@%s %st%llu exp %p cur %lld last %lld\n",
+              target->obd_name, cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
+              target->obd_recovering ? "recovering/" : "", data->ocd_transno,
+              export, ktime_get_real_seconds(),
+              export ? export->exp_last_request_time : 0);
 
        /* If this is the first time a client connects, reset the recovery
         * timer. Discard lightweight connections which might be local. */
@@ -1258,27 +1244,26 @@ no_export:
                /* allow "new" MDT to be connected during recovery, since we
                 * need retrieve recovery update records from it */
                if (target->obd_recovering && !lw_client && !mds_mds_conn) {
-                        cfs_time_t t;
-                       int     c; /* connected */
-                       int     i; /* in progress */
-                       int     k; /* known */
-                       int     s; /* stale/evicted */
+                       time64_t t;
+                       int c; /* connected */
+                       int i; /* in progress */
+                       int k; /* known */
+                       int s; /* stale/evicted */
 
                        c = atomic_read(&target->obd_connected_clients);
                        i = atomic_read(&target->obd_lock_replay_clients);
                        k = target->obd_max_recoverable_clients;
                        s = target->obd_stale_clients;
-                       t = cfs_timer_deadline(&target->obd_recovery_timer);
-                       t = cfs_time_sub(t, cfs_time_current());
-                       t = cfs_duration_sec(t);
+                       t = target->obd_recovery_timer.expires;
+                       t = cfs_duration_sec(target->obd_recovery_timer.expires);
+                       t -= ktime_get_seconds();
                        LCONSOLE_WARN("%s: Denying connection for new client %s"
                                      "(at %s), waiting for %d known clients "
                                      "(%d recovered, %d in progress, and %d "
-                                     "evicted) to recover in %d:%.02d\n",
+                                     "evicted) to recover in %lld:%.02lld\n",
                                      target->obd_name, cluuid.uuid,
                                      libcfs_nid2str(req->rq_peer.nid), k,
-                                     c - i, i, s, (int)t / 60,
-                                     (int)t % 60);
+                                     c - i, i, s, t / 60, t % 60);
                        rc = -EBUSY;
                } else {
 dont_check_exports:
@@ -1333,37 +1318,26 @@ dont_check_exports:
                spin_unlock(&export->exp_lock);
                CDEBUG(D_RPCTRACE, "%s: %s already connected at greater "
                       "or equal conn_cnt: %d >= %d\n",
-                       cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
-                       export->exp_conn_cnt,
-                       lustre_msg_get_conn_cnt(req->rq_reqmsg));
+                      cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
+                      export->exp_conn_cnt,
+                      lustre_msg_get_conn_cnt(req->rq_reqmsg));
 
-                GOTO(out, rc = -EALREADY);
-        }
-        LASSERT(lustre_msg_get_conn_cnt(req->rq_reqmsg) > 0);
-        export->exp_conn_cnt = lustre_msg_get_conn_cnt(req->rq_reqmsg);
-
-       /* Don't evict liblustre clients for not pinging. */
-        if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
-                export->exp_libclient = 1;
-               spin_unlock(&export->exp_lock);
-
-               spin_lock(&target->obd_dev_lock);
-               list_del_init(&export->exp_obd_chain_timed);
-               spin_unlock(&target->obd_dev_lock);
-       } else {
-               spin_unlock(&export->exp_lock);
+               GOTO(out, rc = -EALREADY);
        }
+       LASSERT(lustre_msg_get_conn_cnt(req->rq_reqmsg) > 0);
+       export->exp_conn_cnt = lustre_msg_get_conn_cnt(req->rq_reqmsg);
+       spin_unlock(&export->exp_lock);
 
-        if (export->exp_connection != NULL) {
+       if (export->exp_connection != NULL) {
                /* Check to see if connection came from another NID. */
-                if ((export->exp_connection->c_peer.nid != req->rq_peer.nid) &&
+               if ((export->exp_connection->c_peer.nid != req->rq_peer.nid) &&
                    !hlist_unhashed(&export->exp_nid_hash))
-                        cfs_hash_del(export->exp_obd->obd_nid_hash,
-                                     &export->exp_connection->c_peer.nid,
-                                     &export->exp_nid_hash);
+                       cfs_hash_del(export->exp_obd->obd_nid_hash,
+                                    &export->exp_connection->c_peer.nid,
+                                    &export->exp_nid_hash);
 
-                ptlrpc_connection_put(export->exp_connection);
-        }
+               ptlrpc_connection_put(export->exp_connection);
+       }
 
        export->exp_connection = ptlrpc_connection_get(req->rq_peer,
                                                       req->rq_self,
@@ -1437,12 +1411,11 @@ out:
 
                class_export_put(export);
        }
-       if (target_referenced == true && target != NULL) {
+       if (target != NULL) {
                spin_lock(&target->obd_dev_lock);
                target->obd_conn_inprogress--;
                spin_unlock(&target->obd_dev_lock);
-
-               class_decref(target, __func__, current);
+               class_decref(target, "find", current);
        }
        req->rq_status = rc;
        RETURN(rc);
@@ -1571,18 +1544,20 @@ static void target_finish_recovery(struct lu_target *lut)
 
        /* Only log a recovery message when recovery has occurred. */
        if (obd->obd_recovery_start) {
-               time_t elapsed_time = max_t(time_t, 1, cfs_time_current_sec() -
-                                       obd->obd_recovery_start);
-               LCONSOLE_INFO("%s: Recovery over after %d:%.02d, of %d clients "
+               time64_t now = ktime_get_real_seconds();
+               time64_t elapsed_time;
+
+               elapsed_time = max_t(time64_t, now - obd->obd_recovery_start, 1);
+               LCONSOLE_INFO("%s: Recovery over after %lld:%.02lld, of %d clients "
                        "%d recovered and %d %s evicted.\n", obd->obd_name,
-                       (int)elapsed_time / 60, (int)elapsed_time % 60,
+                       (s64)elapsed_time / 60, (s64)elapsed_time % 60,
                        obd->obd_max_recoverable_clients,
                        atomic_read(&obd->obd_connected_clients),
                        obd->obd_stale_clients,
                        obd->obd_stale_clients == 1 ? "was" : "were");
        }
 
-        ldlm_reprocess_all_ns(obd->obd_namespace);
+       ldlm_reprocess_recovery_done(obd->obd_namespace);
        spin_lock(&obd->obd_recovery_task_lock);
        if (!list_empty(&obd->obd_req_replay_queue) ||
            !list_empty(&obd->obd_lock_replay_queue) ||
@@ -1599,15 +1574,16 @@ static void target_finish_recovery(struct lu_target *lut)
        }
        spin_unlock(&obd->obd_recovery_task_lock);
 
-        obd->obd_recovery_end = cfs_time_current_sec();
+       obd->obd_recovery_end = ktime_get_real_seconds();
 
        /* When recovery finished, cleanup orphans on MDS and OST. */
-        if (OBT(obd) && OBP(obd, postrecov)) {
-                int rc = OBP(obd, postrecov)(obd);
-                if (rc < 0)
-                        LCONSOLE_WARN("%s: Post recovery failed, rc %d\n",
-                                      obd->obd_name, rc);
-        }
+       if (obd->obd_type && OBP(obd, postrecov)) {
+               int rc = OBP(obd, postrecov)(obd);
+
+               if (rc < 0)
+                       LCONSOLE_WARN("%s: Post recovery failed, rc %d\n",
+                                     obd->obd_name, rc);
+       }
         EXIT;
 }
 
@@ -1705,7 +1681,7 @@ EXPORT_SYMBOL(target_cleanup_recovery);
 void target_cancel_recovery_timer(struct obd_device *obd)
 {
         CDEBUG(D_HA, "%s: cancel recovery timer\n", obd->obd_name);
-        cfs_timer_disarm(&obd->obd_recovery_timer);
+       del_timer(&obd->obd_recovery_timer);
 }
 
 static void target_start_recovery_timer(struct obd_device *obd)
@@ -1726,19 +1702,18 @@ static void target_start_recovery_timer(struct obd_device *obd)
                return;
        }
 
-       cfs_timer_arm(&obd->obd_recovery_timer,
-                     cfs_time_shift(obd->obd_recovery_timeout));
-       obd->obd_recovery_start = cfs_time_current_sec();
+       mod_timer(&obd->obd_recovery_timer,
+                 jiffies + cfs_time_seconds(obd->obd_recovery_timeout));
+       obd->obd_recovery_start = ktime_get_real_seconds();
        spin_unlock(&obd->obd_dev_lock);
 
-        LCONSOLE_WARN("%s: Will be in recovery for at least %d:%.02d, "
-                      "or until %d client%s reconnect%s\n",
-                      obd->obd_name,
-                      obd->obd_recovery_timeout / 60,
-                      obd->obd_recovery_timeout % 60,
-                      obd->obd_max_recoverable_clients,
-                      (obd->obd_max_recoverable_clients == 1) ? "" : "s",
-                      (obd->obd_max_recoverable_clients == 1) ? "s": "");
+       LCONSOLE_WARN("%s: Will be in recovery for at least %llu:%02llu, or until %d client%s reconnect%s\n",
+                     obd->obd_name,
+                     obd->obd_recovery_timeout / 60,
+                     obd->obd_recovery_timeout % 60,
+                     obd->obd_max_recoverable_clients,
+                     (obd->obd_max_recoverable_clients == 1) ? "" : "s",
+                     (obd->obd_max_recoverable_clients == 1) ? "s": "");
 }
 
 /**
@@ -1747,24 +1722,25 @@ static void target_start_recovery_timer(struct obd_device *obd)
  * if @extend is true, extend recovery window to have @drt remaining at least;
  * otherwise, make sure the recovery timeout value is not less than @drt.
  */
-static void extend_recovery_timer(struct obd_device *obd, int drt, bool extend)
+static void extend_recovery_timer(struct obd_device *obd, time64_t drt,
+                                 bool extend)
 {
-       cfs_time_t now;
-       cfs_time_t end;
-       cfs_duration_t left;
-       int to;
+       time64_t now;
+       time64_t end;
+       time64_t left;
+       time64_t to;
 
        spin_lock(&obd->obd_dev_lock);
        if (!obd->obd_recovering || obd->obd_abort_recovery) {
                spin_unlock(&obd->obd_dev_lock);
-                return;
-        }
-        LASSERT(obd->obd_recovery_start != 0);
+               return;
+       }
+       LASSERT(obd->obd_recovery_start != 0);
 
-        now  = cfs_time_current_sec();
-        to   = obd->obd_recovery_timeout;
-        end  = obd->obd_recovery_start + to;
-        left = cfs_time_sub(end, now);
+       now = ktime_get_real_seconds();
+       to = obd->obd_recovery_timeout;
+       end = obd->obd_recovery_start + to;
+       left = end - now;
 
         if (extend && (drt > left)) {
                 to += drt - left;
@@ -1772,18 +1748,22 @@ static void extend_recovery_timer(struct obd_device *obd, int drt, bool extend)
                 to = drt;
         }
 
-        if (to > obd->obd_recovery_time_hard)
-                to = obd->obd_recovery_time_hard;
+       if (to > obd->obd_recovery_time_hard) {
+               to = obd->obd_recovery_time_hard;
+               CWARN("%s: extended recovery timer reaching hard limit: %lld, extend: %d\n",
+                     obd->obd_name, to, extend);
+       }
+
        if (obd->obd_recovery_timeout < to) {
                 obd->obd_recovery_timeout = to;
                end = obd->obd_recovery_start + to;
-               cfs_timer_arm(&obd->obd_recovery_timer,
-                               cfs_time_shift(end - now));
+               mod_timer(&obd->obd_recovery_timer,
+                         jiffies + cfs_time_seconds(end - now));
         }
        spin_unlock(&obd->obd_dev_lock);
 
-       CDEBUG(D_HA, "%s: recovery timer will expire in %u seconds\n",
-               obd->obd_name, (unsigned)cfs_time_sub(end, now));
+       CDEBUG(D_HA, "%s: recovery timer will expire in %lld seconds\n",
+               obd->obd_name, (s64)(end - now));
 }
 
 /* Reset the timer with each new client connection */
@@ -1802,7 +1782,7 @@ check_and_start_recovery_timer(struct obd_device *obd,
                                struct ptlrpc_request *req,
                                int new_client)
 {
-        int service_time = lustre_msg_get_service_time(req->rq_reqmsg);
+       time64_t service_time = lustre_msg_get_service_time(req->rq_reqmsg);
         struct obd_device_target *obt = &obd->u.obt;
 
         if (!new_client && service_time)
@@ -1814,9 +1794,14 @@ check_and_start_recovery_timer(struct obd_device *obd,
         target_start_recovery_timer(obd);
 
        /* Convert the service time to RPC timeout,
-        * and reuse service_time to limit stack usage. */
+        * and reuse service_time to limit stack usage.
+        */
        service_time = at_est2timeout(service_time);
 
+       if (OBD_FAIL_CHECK(OBD_FAIL_TGT_SLUGGISH_NET) &&
+           service_time < at_extra)
+               service_time = at_extra;
+
        /* We expect other clients to timeout within service_time, then try
         * to reconnect, then try the failover server.  The max delay between
         * connect attempts is SWITCH_MAX + SWITCH_INC + INITIAL. */
@@ -1982,9 +1967,20 @@ static int target_recovery_overseer(struct lu_target *lut,
 {
        struct obd_device       *obd = lut->lut_obd;
        struct target_distribute_txn_data *tdtd;
+       time64_t last = 0;
+       time64_t now;
 repeat:
-       if ((obd->obd_recovery_start != 0) && (cfs_time_current_sec() >=
-             (obd->obd_recovery_start + obd->obd_recovery_time_hard))) {
+       if (obd->obd_recovering && obd->obd_recovery_start == 0) {
+               now = ktime_get_seconds();
+               if (now - last > 600) {
+                       LCONSOLE_INFO("%s: in recovery but waiting for "
+                                     "the first client to connect\n",
+                                     obd->obd_name);
+                       last = now;
+               }
+       }
+       if (obd->obd_recovery_start != 0 && ktime_get_real_seconds() >=
+             (obd->obd_recovery_start + obd->obd_recovery_time_hard)) {
                __u64 next_update_transno = 0;
 
                /* Only abort the recovery if there are no update recovery
@@ -2153,7 +2149,7 @@ static void handle_recovery_req(struct ptlrpc_thread *thread,
 
         /* don't reset timer for final stage */
         if (!exp_finished(req->rq_export)) {
-                int to = obd_timeout;
+               time64_t to = obd_timeout;
 
                 /**
                  * Add request timeout to the recovery time so next request from
@@ -2207,9 +2203,8 @@ static int check_for_recovery_ready(struct lu_target *lut)
                         * timer expired, and some clients got evicted */
                        extend_recovery_timer(obd, obd->obd_recovery_timeout,
                                              true);
-                       CDEBUG(D_HA, "%s update recovery is not ready,"
-                              " extend recovery %d\n", obd->obd_name,
-                              obd->obd_recovery_timeout);
+                       CDEBUG(D_HA, "%s update recovery is not ready, extend recovery %llu\n",
+                              obd->obd_name, obd->obd_recovery_timeout);
                        return 0;
                }
        }
@@ -2612,9 +2607,9 @@ static void target_recovery_expired(unsigned long castmeharder)
 {
        struct obd_device *obd = (struct obd_device *)castmeharder;
        CDEBUG(D_HA, "%s: recovery timed out; %d clients are still in recovery"
-              " after %lds (%d clients connected)\n",
+              " after %llus (%d clients connected)\n",
               obd->obd_name, atomic_read(&obd->obd_lock_replay_clients),
-              cfs_time_current_sec()- obd->obd_recovery_start,
+              (s64)(ktime_get_real_seconds() - obd->obd_recovery_start),
               atomic_read(&obd->obd_connected_clients));
 
        obd->obd_recovery_expired = 1;
@@ -2623,13 +2618,16 @@ static void target_recovery_expired(unsigned long castmeharder)
 
 void target_recovery_init(struct lu_target *lut, svc_handler_t handler)
 {
-        struct obd_device *obd = lut->lut_obd;
+       struct obd_device *obd = lut->lut_obd;
 
-        if (obd->obd_max_recoverable_clients == 0) {
-                /** Update server last boot epoch */
-                tgt_boot_epoch_update(lut);
-                return;
-        }
+       if (lut->lut_bottom->dd_rdonly)
+               return;
+
+       if (obd->obd_max_recoverable_clients == 0) {
+               /** Update server last boot epoch */
+               tgt_boot_epoch_update(lut);
+               return;
+       }
 
        CDEBUG(D_HA, "RECOVERY: service %s, %d recoverable clients, "
               "last_transno %llu\n", obd->obd_name,
@@ -2639,8 +2637,9 @@ void target_recovery_init(struct lu_target *lut, svc_handler_t handler)
         obd->obd_recovery_start = 0;
         obd->obd_recovery_end = 0;
 
-        cfs_timer_init(&obd->obd_recovery_timer, target_recovery_expired, obd);
-        target_start_recovery_thread(lut, handler);
+       setup_timer(&obd->obd_recovery_timer, target_recovery_expired,
+                   (unsigned long)obd);
+       target_start_recovery_thread(lut, handler);
 }
 EXPORT_SYMBOL(target_recovery_init);
 
@@ -2695,6 +2694,17 @@ int target_queue_recovery_request(struct ptlrpc_request *req,
         target_process_req_flags(obd, req);
 
         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
+               if (unlikely(OBD_FAIL_CHECK(OBD_FAIL_TGT_RECOVERY_REQ_RACE))) {
+                       if (cfs_fail_val == 1) {
+                               cfs_race_state = 1;
+                               cfs_fail_val = 0;
+                               wake_up(&cfs_race_waitq);
+
+                               set_current_state(TASK_INTERRUPTIBLE);
+                               schedule_timeout(cfs_time_seconds(1));
+                       }
+               }
+
                 /* client declares he's ready to complete recovery
                  * so, we put the request on th final queue */
                target_request_copy_get(req);
@@ -3142,10 +3152,10 @@ static inline const char *bulk2type(struct ptlrpc_request *req)
 int target_bulk_io(struct obd_export *exp, struct ptlrpc_bulk_desc *desc,
                    struct l_wait_info *lwi)
 {
-       struct ptlrpc_request   *req = desc->bd_req;
-       time_t                   start = cfs_time_current_sec();
-       time_t                   deadline;
-       int                      rc = 0;
+       struct ptlrpc_request *req = desc->bd_req;
+       time64_t start = ktime_get_real_seconds();
+       time64_t deadline;
+       int rc = 0;
 
        ENTRY;
 
@@ -3192,12 +3202,13 @@ int target_bulk_io(struct obd_export *exp, struct ptlrpc_bulk_desc *desc,
                deadline = req->rq_deadline;
 
        do {
-               long timeoutl = deadline - cfs_time_current_sec();
-               cfs_duration_t timeout = timeoutl <= 0 ?
-                                        CFS_TICK : cfs_time_seconds(timeoutl);
-               time_t  rq_deadline;
+               time64_t timeoutl = deadline - ktime_get_real_seconds();
+               long timeout_jiffies = timeoutl <= 0 ?
+                                      1 : cfs_time_seconds(timeoutl);
+               time64_t rq_deadline;
 
-               *lwi = LWI_TIMEOUT_INTERVAL(timeout, cfs_time_seconds(1),
+               *lwi = LWI_TIMEOUT_INTERVAL(timeout_jiffies,
+                                           cfs_time_seconds(1),
                                            target_bulk_timeout, desc);
                rc = l_wait_event(desc->bd_waitq,
                                  !ptlrpc_server_bulk_active(desc) ||
@@ -3211,13 +3222,13 @@ int target_bulk_io(struct obd_export *exp, struct ptlrpc_bulk_desc *desc,
                deadline = start + bulk_timeout;
                if (deadline > rq_deadline)
                        deadline = rq_deadline;
-       } while ((rc == -ETIMEDOUT) &&
-                (deadline > cfs_time_current_sec()));
+       } while (rc == -ETIMEDOUT &&
+                deadline > ktime_get_real_seconds());
 
        if (rc == -ETIMEDOUT) {
-               DEBUG_REQ(D_ERROR, req, "timeout on bulk %s after %ld%+lds",
+               DEBUG_REQ(D_ERROR, req, "timeout on bulk %s after %lld%+llds",
                          bulk2type(req), deadline - start,
-                         cfs_time_current_sec() - deadline);
+                         ktime_get_real_seconds() - deadline);
                ptlrpc_abort_bulk(desc);
        } else if (exp->exp_failed) {
                DEBUG_REQ(D_ERROR, req, "Eviction on bulk %s",