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LU-6179 llite: Implement ladvise lockahead
[fs/lustre-release.git] / lustre / ldlm / ldlm_lib.c
index 1d4d6b7..ea5af07 100644 (file)
  *
  * You should have received a copy of the GNU General Public License
  * version 2 along with this program; If not, see
- * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
- *
- * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
- * CA 95054 USA or visit www.sun.com if you need additional information or
- * have any questions.
+ * http://www.gnu.org/licenses/gpl-2.0.html
  *
  * GPL HEADER END
  */
@@ -27,7 +23,7 @@
  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
  * Use is subject to license terms.
  *
- * Copyright (c) 2010, 2014, Intel Corporation.
+ * Copyright (c) 2010, 2016, 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)
@@ -167,14 +167,17 @@ int client_import_del_conn(struct obd_import *imp, struct obd_uuid *uuid)
                         ptlrpc_connection_put(imp->imp_connection);
                         imp->imp_connection = NULL;
 
-                        dlmexp = class_conn2export(&imp->imp_dlm_handle);
-                        if (dlmexp && dlmexp->exp_connection) {
-                                LASSERT(dlmexp->exp_connection ==
-                                        imp_conn->oic_conn);
-                                ptlrpc_connection_put(dlmexp->exp_connection);
-                                dlmexp->exp_connection = NULL;
-                        }
-                }
+                       dlmexp = class_conn2export(&imp->imp_dlm_handle);
+                       if (dlmexp && dlmexp->exp_connection) {
+                               LASSERT(dlmexp->exp_connection ==
+                                       imp_conn->oic_conn);
+                               ptlrpc_connection_put(dlmexp->exp_connection);
+                               dlmexp->exp_connection = NULL;
+                       }
+
+                       if (dlmexp != NULL)
+                               class_export_put(dlmexp);
+               }
 
                list_del(&imp_conn->oic_item);
                 ptlrpc_connection_put(imp_conn->oic_conn);
@@ -257,6 +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)
 {
@@ -267,6 +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;
 
@@ -344,10 +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;
@@ -381,6 +389,7 @@ int client_obd_setup(struct obd_device *obddev, struct lustre_cfg *lcfg)
        INIT_LIST_HEAD(&cli->cl_lru_list);
        spin_lock_init(&cli->cl_lru_list_lock);
        atomic_long_set(&cli->cl_unstable_count, 0);
+       INIT_LIST_HEAD(&cli->cl_shrink_list);
 
        init_waitqueue_head(&cli->cl_destroy_waitq);
        atomic_set(&cli->cl_destroy_in_flight, 0);
@@ -396,24 +405,21 @@ int client_obd_setup(struct obd_device *obddev, struct lustre_cfg *lcfg)
 #endif
        atomic_set(&cli->cl_resends, OSC_DEFAULT_RESENDS);
 
-       /* This value may be reduced at connect time in
-        * ptlrpc_connect_interpret() . We initialize it to only
-        * 1MB until we know what the performance looks like.
-        * In the future this should likely be increased. LU-1431 */
-       cli->cl_max_pages_per_rpc = min_t(int, PTLRPC_MAX_BRW_PAGES,
-                                         LNET_MTU >> PAGE_CACHE_SHIFT);
+       /* Set it to possible maximum size. It may be reduced by ocd_brw_size
+        * from OFD after connecting. */
+       cli->cl_max_pages_per_rpc = PTLRPC_MAX_BRW_PAGES;
 
-       /* set cl_chunkbits default value to PAGE_CACHE_SHIFT,
+       /* set cl_chunkbits default value to PAGE_SHIFT,
         * it will be updated at OSC connection time. */
-       cli->cl_chunkbits = PAGE_CACHE_SHIFT;
+       cli->cl_chunkbits = PAGE_SHIFT;
 
        if (!strcmp(name, LUSTRE_MDC_NAME)) {
                cli->cl_max_rpcs_in_flight = OBD_MAX_RIF_DEFAULT;
-       } else if (totalram_pages >> (20 - PAGE_CACHE_SHIFT) <= 128 /* MB */) {
+       } else if (totalram_pages >> (20 - PAGE_SHIFT) <= 128 /* MB */) {
                cli->cl_max_rpcs_in_flight = 2;
-       } else if (totalram_pages >> (20 - PAGE_CACHE_SHIFT) <= 256 /* MB */) {
+       } else if (totalram_pages >> (20 - PAGE_SHIFT) <= 256 /* MB */) {
                cli->cl_max_rpcs_in_flight = 3;
-       } else if (totalram_pages >> (20 - PAGE_CACHE_SHIFT) <= 512 /* MB */) {
+       } else if (totalram_pages >> (20 - PAGE_SHIFT) <= 512 /* MB */) {
                cli->cl_max_rpcs_in_flight = 4;
        } else {
                if (osc_on_mdt(obddev->obd_name))
@@ -430,6 +436,8 @@ 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,
@@ -456,11 +464,26 @@ 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() */
@@ -536,66 +559,59 @@ 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;
+       *exp = NULL;
        down_write(&cli->cl_sem);
        if (cli->cl_conn_count > 0)
                 GOTO(out_sem, rc = -EALREADY);
 
-        rc = class_connect(&conn, obd, cluuid);
-        if (rc)
-                GOTO(out_sem, rc);
+       rc = class_connect(&conn, obd, cluuid);
+       if (rc)
+               GOTO(out_sem, rc);
 
-        cli->cl_conn_count++;
-        *exp = class_conn2export(&conn);
+       cli->cl_conn_count++;
+       *exp = class_conn2export(&conn);
 
-        LASSERT(obd->obd_namespace);
+       LASSERT(obd->obd_namespace);
 
-        imp->imp_dlm_handle = conn;
-        rc = ptlrpc_init_import(imp);
-        if (rc != 0)
-                GOTO(out_ldlm, rc);
+       imp->imp_dlm_handle = conn;
+       rc = ptlrpc_init_import(imp);
+       if (rc != 0)
+               GOTO(out_ldlm, rc);
 
-        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;
-        }
+       ocd = &imp->imp_connect_data;
+       if (data) {
+               *ocd = *data;
+               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) {
-                LASSERT (imp->imp_state == LUSTRE_IMP_DISCON);
-                GOTO(out_ldlm, rc);
-        }
+       rc = ptlrpc_connect_import(imp);
+       if (rc != 0) {
+               LASSERT(imp->imp_state == LUSTRE_IMP_DISCON);
+               GOTO(out_ldlm, rc);
+       }
        LASSERT(*exp != NULL && (*exp)->exp_connection);
 
-        if (data) {
-                LASSERTF((ocd->ocd_connect_flags & data->ocd_connect_flags) ==
-                         ocd->ocd_connect_flags, "old "LPX64", new "LPX64"\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;
-        }
+       if (data) {
+               LASSERTF((ocd->ocd_connect_flags & data->ocd_connect_flags) ==
+                        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;
+               data->ocd_connect_flags2 = ocd->ocd_connect_flags2;
+       }
 
-        ptlrpc_pinger_add_import(imp);
+       ptlrpc_pinger_add_import(imp);
 
-        EXIT;
+       EXIT;
 
-        if (rc) {
+       if (rc) {
 out_ldlm:
-                cli->cl_conn_count--;
-                class_disconnect(*exp);
-                *exp = NULL;
-        }
+               cli->cl_conn_count--;
+               class_disconnect(*exp);
+               *exp = NULL;
+       }
 out_sem:
        up_write(&cli->cl_sem);
 
@@ -612,7 +628,7 @@ int client_disconnect_export(struct obd_export *exp)
         ENTRY;
 
         if (!obd) {
-                CERROR("invalid export for disconnect: exp %p cookie "LPX64"\n",
+               CERROR("invalid export for disconnect: exp %p cookie %#llx\n",
                        exp, exp ? exp->exp_handle.h_cookie : -1);
                 RETURN(-EINVAL);
         }
@@ -701,7 +717,10 @@ 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);
 
@@ -721,76 +740,95 @@ static int target_handle_reconnect(struct lustre_handle *conn,
                                    struct obd_export *exp,
                                    struct obd_uuid *cluuid)
 {
+       struct obd_device *target;
        struct lustre_handle *hdl;
+       cfs_time_t now;
+       cfs_time_t deadline;
+       int timeout;
+       int rc = 0;
        ENTRY;
 
        hdl = &exp->exp_imp_reverse->imp_remote_handle;
-       if (exp->exp_connection && lustre_handle_is_used(hdl)) {
-                struct obd_device *target;
-
-                target = exp->exp_obd;
-
-                /* Might be a re-connect after a partition. */
-                if (!memcmp(&conn->cookie, &hdl->cookie, sizeof conn->cookie)) {
-                        if (target->obd_recovering) {
-                                int timeout = cfs_duration_sec(cfs_time_sub(
-                                        cfs_timer_deadline(
-                                        &target->obd_recovery_timer),
-                                        cfs_time_current()));
-
-                                LCONSOLE_WARN("%s: Client %s (at %s) reconnect"
-                                        "ing, waiting for %d clients in recov"
-                                        "ery for %d:%.02d\n", target->obd_name,
-                                        obd_uuid2str(&exp->exp_client_uuid),
-                                        obd_export_nid2str(exp),
-                                        target->obd_max_recoverable_clients,
-                                        timeout / 60, timeout % 60);
-                        } else {
-                                LCONSOLE_WARN("%s: Client %s (at %s) "
-                                        "reconnecting\n", target->obd_name,
-                                        obd_uuid2str(&exp->exp_client_uuid),
-                                        obd_export_nid2str(exp));
-                        }
-
-                        conn->cookie = exp->exp_handle.h_cookie;
-                        /* target_handle_connect() treats EALREADY and
-                         * -EALREADY differently.  EALREADY means we are
-                         * doing a valid reconnect from the same client. */
-                        RETURN(EALREADY);
-                } else {
-                       LCONSOLE_WARN("%s: already connected client %s (at %s) "
-                                     "with handle "LPX64". Rejecting client "
-                                     "with the same UUID trying to reconnect "
-                                     "with handle "LPX64"\n", target->obd_name,
-                                     obd_uuid2str(&exp->exp_client_uuid),
-                                     obd_export_nid2str(exp),
-                                     hdl->cookie, conn->cookie);
-                        memset(conn, 0, sizeof *conn);
-                        /* target_handle_connect() treats EALREADY and
-                         * -EALREADY differently.  -EALREADY is an error
-                         * (same UUID, different handle). */
-                        RETURN(-EALREADY);
-                }
-        }
+       if (!exp->exp_connection || !lustre_handle_is_used(hdl)) {
+               conn->cookie = exp->exp_handle.h_cookie;
+               CDEBUG(D_HA, "connect export for UUID '%s' at %p,"
+                      " cookie %#llx\n", cluuid->uuid, exp, conn->cookie);
+               RETURN(0);
+       }
 
-        conn->cookie = exp->exp_handle.h_cookie;
-        CDEBUG(D_HA, "connect export for UUID '%s' at %p, cookie "LPX64"\n",
-               cluuid->uuid, exp, conn->cookie);
-        RETURN(0);
-}
+       target = exp->exp_obd;
+
+       /* Might be a re-connect after a partition. */
+       if (memcmp(&conn->cookie, &hdl->cookie, sizeof conn->cookie)) {
+               LCONSOLE_WARN("%s: already connected client %s (at %s) "
+                             "with handle %#llx. Rejecting client "
+                             "with the same UUID trying to reconnect "
+                             "with handle %#llx\n", target->obd_name,
+                             obd_uuid2str(&exp->exp_client_uuid),
+                             obd_export_nid2str(exp),
+                             hdl->cookie, conn->cookie);
+               memset(conn, 0, sizeof *conn);
+               /* target_handle_connect() treats EALREADY and
+                * -EALREADY differently.  -EALREADY is an error
+                * (same UUID, different handle). */
+               RETURN(-EALREADY);
+       }
 
-void target_client_add_cb(struct obd_device *obd, __u64 transno, void *cb_data,
-                          int error)
-{
-        struct obd_export *exp = cb_data;
+       if (!target->obd_recovering) {
+               LCONSOLE_WARN("%s: Client %s (at %s) reconnecting\n",
+                       target->obd_name, obd_uuid2str(&exp->exp_client_uuid),
+                       obd_export_nid2str(exp));
+               GOTO(out_already, rc);
+       }
 
-        CDEBUG(D_RPCTRACE, "%s: committing for initial connect of %s\n",
-               obd->obd_name, exp->exp_client_uuid.uuid);
+       now = cfs_time_current();
+       deadline = target->obd_recovery_timer.expires;
+       if (cfs_time_before(now, deadline)) {
+               struct target_distribute_txn_data *tdtd =
+                                       class_exp2tgt(exp)->lut_tdtd;
+               int size = 0;
+               int count = 0;
+               char *buf = NULL;
+
+               timeout = cfs_duration_sec(cfs_time_sub(deadline, now));
+               if (tdtd && tdtd->tdtd_show_update_logs_retrievers)
+                       buf = tdtd->tdtd_show_update_logs_retrievers(
+                               tdtd->tdtd_show_retrievers_cbdata,
+                               &size, &count);
+
+               if (count > 0)
+                       LCONSOLE_WARN("%s: Recovery already passed deadline "
+                                     "%d:%.02d. 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",
+                                     target->obd_name, timeout / 60,
+                                     timeout % 60, count,
+                                     buf ? buf : "unknown (not enough RAM)");
+               else
+                       LCONSOLE_WARN("%s: Recovery already passed deadline "
+                                     "%d:%.02d. If you do not want to wait "
+                                     "more, please abort the recovery by "
+                                     "force.\n", target->obd_name,
+                                     timeout / 60, timeout % 60);
+
+               if (buf != NULL)
+                       OBD_FREE(buf, size);
+       } else {
+               timeout = cfs_duration_sec(cfs_time_sub(now, deadline));
+               LCONSOLE_WARN("%s: Recovery already passed deadline"
+                       " %d:%.02d, 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);
+       }
 
-       spin_lock(&exp->exp_lock);
-       exp->exp_need_sync = 0;
-       spin_unlock(&exp->exp_lock);
-       class_export_cb_put(exp);
+out_already:
+       conn->cookie = exp->exp_handle.h_cookie;
+       /* target_handle_connect() treats EALREADY and
+        * -EALREADY differently.  EALREADY means we are
+        * doing a valid reconnect from the same client. */
+       RETURN(EALREADY);
 }
 
 static void
@@ -919,9 +957,10 @@ int target_handle_connect(struct ptlrpc_request *req)
         int rc = 0;
         char *target_start;
         int target_len;
-       bool     mds_conn = false, lw_client = false;
+       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;
@@ -951,11 +990,6 @@ int target_handle_connect(struct ptlrpc_request *req)
        }
 
        spin_lock(&target->obd_dev_lock);
-       /* 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);
-
        if (target->obd_stopping || !target->obd_set_up) {
                spin_unlock(&target->obd_dev_lock);
 
@@ -977,6 +1011,12 @@ 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);
 
@@ -1049,6 +1089,7 @@ int target_handle_connect(struct ptlrpc_request *req)
        lw_client = (data->ocd_connect_flags & OBD_CONNECT_LIGHTWEIGHT) != 0;
 
        if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_INITIAL) {
+               initial_conn = true;
                mds_conn = (data->ocd_connect_flags & OBD_CONNECT_MDS) != 0;
                mds_mds_conn = (data->ocd_connect_flags &
                                OBD_CONNECT_MDS_MDS) != 0;
@@ -1106,29 +1147,45 @@ int target_handle_connect(struct ptlrpc_request *req)
                class_export_put(export);
                export = NULL;
                rc = -EALREADY;
-       } else if ((mds_conn || lw_client) && export->exp_connection != NULL) {
+       } else if ((mds_conn || (lw_client && initial_conn) ||
+                  data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) &&
+                  export->exp_connection != NULL) {
                spin_unlock(&export->exp_lock);
-               if (req->rq_peer.nid != export->exp_connection->c_peer.nid)
+               if (req->rq_peer.nid != export->exp_connection->c_peer.nid) {
                        /* MDS or LWP reconnected after failover. */
                        LCONSOLE_WARN("%s: Received %s connection from "
                            "%s, removing former export from %s\n",
                            target->obd_name, mds_conn ? "MDS" : "LWP",
                            libcfs_nid2str(req->rq_peer.nid),
                            libcfs_nid2str(export->exp_connection->c_peer.nid));
-               else
+               } else {
                        /* New MDS connection from the same NID. */
                        LCONSOLE_WARN("%s: Received new %s connection from "
                                "%s, removing former export from same NID\n",
                                target->obd_name, mds_conn ? "MDS" : "LWP",
                                libcfs_nid2str(req->rq_peer.nid));
-                class_fail_export(export);
-                class_export_put(export);
-                export = NULL;
-                rc = 0;
-        } else if (export->exp_connection != NULL &&
-                   req->rq_peer.nid != export->exp_connection->c_peer.nid &&
-                   (lustre_msg_get_op_flags(req->rq_reqmsg) &
-                    MSG_CONNECT_INITIAL)) {
+               }
+
+               if (req->rq_peer.nid == export->exp_connection->c_peer.nid &&
+                   data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) {
+                       /* Because exports between MDTs will always be
+                        * kept, let's do not fail such export if they
+                        * come from the same NID, otherwise it might
+                        * cause eviction between MDTs, which might
+                        * cause namespace inconsistency */
+                       spin_lock(&export->exp_lock);
+                       export->exp_connecting = 1;
+                       spin_unlock(&export->exp_lock);
+                       conn.cookie = export->exp_handle.h_cookie;
+                       rc = EALREADY;
+               } else {
+                       class_fail_export(export);
+                       class_export_put(export);
+                       export = NULL;
+                       rc = 0;
+               }
+       } else if (export->exp_connection != NULL && initial_conn &&
+                  req->rq_peer.nid != export->exp_connection->c_peer.nid) {
                spin_unlock(&export->exp_lock);
                /* In MDS failover we have static UUID but NID can change. */
                 LCONSOLE_WARN("%s: Client %s seen on new nid %s when "
@@ -1176,7 +1233,7 @@ no_export:
                 GOTO(out, rc);
         }
 
-        CDEBUG(D_HA, "%s: connection from %s@%s %st"LPU64" exp %p cur %ld last %ld\n",
+       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(),
@@ -1216,7 +1273,7 @@ no_export:
                        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 = target->obd_recovery_timer.expires;
                        t = cfs_time_sub(t, cfs_time_current());
                        t = cfs_duration_sec(t);
                        LCONSOLE_WARN("%s: Denying connection for new client %s"
@@ -1385,7 +1442,7 @@ out:
 
                class_export_put(export);
        }
-       if (target != NULL) {
+       if (target_referenced == true && target != NULL) {
                spin_lock(&target->obd_dev_lock);
                target->obd_conn_inprogress--;
                spin_unlock(&target->obd_dev_lock);
@@ -1519,18 +1576,20 @@ 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) ||
@@ -1547,14 +1606,7 @@ static void target_finish_recovery(struct lu_target *lut)
        }
        spin_unlock(&obd->obd_recovery_task_lock);
 
-       if (lut->lut_tdtd != NULL &&
-           (!list_empty(&lut->lut_tdtd->tdtd_replay_list) ||
-           !list_empty(&lut->lut_tdtd->tdtd_replay_finish_list))) {
-               dtrq_list_dump(lut->lut_tdtd, D_ERROR);
-               dtrq_list_destroy(lut->lut_tdtd);
-       }
-
-        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)) {
@@ -1629,7 +1681,6 @@ void target_cleanup_recovery(struct obd_device *obd)
                return;
        }
        obd->obd_recovering = obd->obd_abort_recovery = 0;
-       obd->obd_force_abort_recovery = 0;
        spin_unlock(&obd->obd_dev_lock);
 
        spin_lock(&obd->obd_recovery_task_lock);
@@ -1661,7 +1712,7 @@ 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)
@@ -1670,8 +1721,7 @@ static void target_start_recovery_timer(struct obd_device *obd)
                return;
 
        spin_lock(&obd->obd_dev_lock);
-       if (!obd->obd_recovering || obd->obd_abort_recovery ||
-           obd->obd_force_abort_recovery) {
+       if (!obd->obd_recovering || obd->obd_abort_recovery) {
                spin_unlock(&obd->obd_dev_lock);
                return;
        }
@@ -1683,19 +1733,18 @@ 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,
+                 cfs_time_shift(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": "");
 }
 
 /**
@@ -1704,25 +1753,25 @@ 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, int 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 ||
-           obd->obd_force_abort_recovery) {
+       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;
@@ -1730,18 +1779,22 @@ 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,
+                         cfs_time_shift(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 */
@@ -1775,6 +1828,10 @@ check_and_start_recovery_timer(struct obd_device *obd,
         * 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. */
@@ -1798,6 +1855,14 @@ static inline int exp_req_replay_healthy(struct obd_export *exp)
        return (!exp->exp_req_replay_needed ||
                atomic_read(&exp->exp_replay_count) > 0);
 }
+
+
+static inline int exp_req_replay_healthy_or_from_mdt(struct obd_export *exp)
+{
+       return (exp_connect_flags(exp) & OBD_CONNECT_MDS_MDS) ||
+              exp_req_replay_healthy(exp);
+}
+
 /** if export done lock_replay or has replay in queue */
 static inline int exp_lock_replay_healthy(struct obd_export *exp)
 {
@@ -1815,6 +1880,12 @@ static inline int exp_finished(struct obd_export *exp)
         return (exp->exp_in_recovery && !exp->exp_lock_replay_needed);
 }
 
+static inline int exp_finished_or_from_mdt(struct obd_export *exp)
+{
+       return (exp_connect_flags(exp) & OBD_CONNECT_MDS_MDS) ||
+               exp_finished(exp);
+}
+
 static int check_for_next_transno(struct lu_target *lut)
 {
        struct ptlrpc_request *req = NULL;
@@ -1842,11 +1913,11 @@ static int check_for_next_transno(struct lu_target *lut)
        next_transno = obd->obd_next_recovery_transno;
 
        CDEBUG(D_HA, "max: %d, connected: %d, completed: %d, queue_len: %d, "
-              "req_transno: "LPU64", next_transno: "LPU64"\n",
+              "req_transno: %llu, next_transno: %llu\n",
               obd->obd_max_recoverable_clients, connected, completed,
               queue_len, req_transno, next_transno);
 
-       if (obd->obd_abort_recovery || obd->obd_force_abort_recovery) {
+       if (obd->obd_abort_recovery) {
                CDEBUG(D_HA, "waking for aborted recovery\n");
                wake_up = 1;
        } else if (obd->obd_recovery_expired) {
@@ -1854,29 +1925,25 @@ static int check_for_next_transno(struct lu_target *lut)
                wake_up = 1;
        } else if (tdtd != NULL && req != NULL &&
                   is_req_replayed_by_update(req)) {
-               LASSERTF(req_transno < next_transno, "req_transno "LPU64
-                        "next_transno"LPU64"\n", req_transno, next_transno);
-               CDEBUG(D_HA, "waking for duplicate req ("LPU64")\n",
+               LASSERTF(req_transno < next_transno, "req_transno %llu"
+                        "next_transno%llu\n", req_transno, next_transno);
+               CDEBUG(D_HA, "waking for duplicate req (%llu)\n",
                       req_transno);
                wake_up = 1;
        } else if (req_transno == next_transno ||
                   (update_transno != 0 && update_transno <= next_transno)) {
-               CDEBUG(D_HA, "waking for next ("LPD64")\n", next_transno);
+               CDEBUG(D_HA, "waking for next (%lld)\n", next_transno);
                wake_up = 1;
        } else if (queue_len > 0 &&
                   queue_len == atomic_read(&obd->obd_req_replay_clients)) {
-               int d_lvl = D_HA;
                /** handle gaps occured due to lost reply or VBR */
                LASSERTF(req_transno >= next_transno,
-                        "req_transno: "LPU64", next_transno: "LPU64"\n",
+                        "req_transno: %llu, next_transno: %llu\n",
                         req_transno, next_transno);
-               if (req_transno > obd->obd_last_committed &&
-                   !obd->obd_version_recov)
-                       d_lvl = D_ERROR;
-               CDEBUG(d_lvl,
+               CDEBUG(D_HA,
                       "%s: waking for gap in transno, VBR is %s (skip: "
-                      LPD64", ql: %d, comp: %d, conn: %d, next: "LPD64
-                      ", next_update "LPD64" last_committed: "LPD64")\n",
+                      "%lld, ql: %d, comp: %d, conn: %d, next: %lld"
+                      ", next_update %lld last_committed: %lld)\n",
                       obd->obd_name, obd->obd_version_recov ? "ON" : "OFF",
                       next_transno, queue_len, completed, connected,
                       req_transno, update_transno, obd->obd_last_committed);
@@ -1887,7 +1954,7 @@ static int check_for_next_transno(struct lu_target *lut)
                wake_up = 1;
        } else if (OBD_FAIL_CHECK(OBD_FAIL_MDS_RECOVERY_ACCEPTS_GAPS)) {
                CDEBUG(D_HA, "accepting transno gaps is explicitly allowed"
-                      " by fail_lock, waking up ("LPD64")\n", next_transno);
+                      " by fail_lock, waking up (%lld)\n", next_transno);
                obd->obd_next_recovery_transno = req_transno;
                wake_up = 1;
        }
@@ -1907,7 +1974,7 @@ static int check_for_next_lock(struct lu_target *lut)
        } else if (atomic_read(&obd->obd_lock_replay_clients) == 0) {
                CDEBUG(D_HA, "waking for completed lock replay\n");
                wake_up = 1;
-       } else if (obd->obd_abort_recovery || obd->obd_force_abort_recovery) {
+       } else if (obd->obd_abort_recovery) {
                CDEBUG(D_HA, "waking for aborted recovery\n");
                wake_up = 1;
        } else if (obd->obd_recovery_expired) {
@@ -1929,11 +1996,59 @@ static int target_recovery_overseer(struct lu_target *lut,
                                    int (*health_check)(struct obd_export *))
 {
        struct obd_device       *obd = lut->lut_obd;
+       struct target_distribute_txn_data *tdtd;
 repeat:
-       if ((obd->obd_recovery_start != 0) && (cfs_time_current_sec() >=
-             (obd->obd_recovery_start + obd->obd_recovery_time_hard))) {
-               CWARN("recovery is aborted by hard timeout\n");
-               obd->obd_abort_recovery = 1;
+       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
+                * left in the queue */
+               spin_lock(&obd->obd_recovery_task_lock);
+               if (lut->lut_tdtd != NULL) {
+                       next_update_transno =
+                               distribute_txn_get_next_transno(lut->lut_tdtd);
+
+                       tdtd = lut->lut_tdtd;
+                       /* If next_update_transno == 0, it probably because
+                        * updatelog retrieve threads did not get any records
+                        * yet, let's wait those threads stopped */
+                       if (next_update_transno == 0) {
+                               struct l_wait_info lwi = { 0 };
+
+                               l_wait_event(tdtd->tdtd_recovery_threads_waitq,
+                                      atomic_read(
+                                      &tdtd->tdtd_recovery_threads_count) == 0,
+                                      &lwi);
+
+                               next_update_transno =
+                                       distribute_txn_get_next_transno(
+                                                               lut->lut_tdtd);
+                       }
+               }
+
+               if (next_update_transno != 0 && !obd->obd_abort_recovery) {
+                       obd->obd_next_recovery_transno = next_update_transno;
+                       spin_unlock(&obd->obd_recovery_task_lock);
+                       /* Disconnect unfinished exports from clients, and
+                        * keep connection from MDT to make sure the update
+                        * recovery will still keep trying until some one
+                        * manually abort the recovery */
+                       class_disconnect_stale_exports(obd,
+                                               exp_finished_or_from_mdt);
+                       /* Abort all of replay and replay lock req from
+                        * clients */
+                       abort_req_replay_queue(obd);
+                       abort_lock_replay_queue(obd);
+                       CDEBUG(D_HA, "%s: there are still update replay (%#llx"
+                              ")in the queue.\n", obd->obd_name,
+                              next_update_transno);
+               } else {
+                       obd->obd_abort_recovery = 1;
+                       spin_unlock(&obd->obd_recovery_task_lock);
+                       CWARN("%s recovery is aborted by hard timeout\n",
+                             obd->obd_name);
+               }
        }
 
        while (wait_event_timeout(obd->obd_next_transno_waitq,
@@ -1941,8 +2056,21 @@ repeat:
                                  msecs_to_jiffies(60 * MSEC_PER_SEC)) == 0)
                /* wait indefinitely for event, but don't trigger watchdog */;
 
-       if (obd->obd_abort_recovery || obd->obd_force_abort_recovery) {
+       if (obd->obd_abort_recovery) {
                CWARN("recovery is aborted, evict exports in recovery\n");
+               if (lut->lut_tdtd != NULL) {
+                       struct l_wait_info lwi = { 0 };
+
+                       tdtd = lut->lut_tdtd;
+                       /* Let's wait all of the update log recovery thread
+                        * finished */
+                       l_wait_event(tdtd->tdtd_recovery_threads_waitq,
+                        atomic_read(&tdtd->tdtd_recovery_threads_count) == 0,
+                            &lwi);
+                       /* Then abort the update recovery list */
+                       dtrq_list_destroy(lut->lut_tdtd);
+               }
+
                /** evict exports which didn't finish recovery yet */
                class_disconnect_stale_exports(obd, exp_finished);
                return 1;
@@ -1953,6 +2081,7 @@ repeat:
                              "evict stale exports\n", obd->obd_name);
                /** evict cexports with no replay in queue, they are stalled */
                class_disconnect_stale_exports(obd, health_check);
+
                /** continue with VBR */
                spin_lock(&obd->obd_dev_lock);
                obd->obd_version_recov = 1;
@@ -2079,9 +2208,6 @@ static int check_for_recovery_ready(struct lu_target *lut)
               obd->obd_max_recoverable_clients, obd->obd_abort_recovery,
               obd->obd_recovery_expired);
 
-       if (obd->obd_force_abort_recovery)
-               return 1;
-
        if (!obd->obd_abort_recovery && !obd->obd_recovery_expired) {
                LASSERT(clnts <= obd->obd_max_recoverable_clients);
                if (clnts + obd->obd_stale_clients <
@@ -2090,14 +2216,15 @@ static int check_for_recovery_ready(struct lu_target *lut)
        }
 
        if (lut->lut_tdtd != NULL) {
-               if (!lut->lut_tdtd->tdtd_replay_ready) {
+               if (!lut->lut_tdtd->tdtd_replay_ready &&
+                   !obd->obd_abort_recovery) {
                        /* Let's extend recovery timer, in case the recovery
                         * 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 %llu\n",
+                              obd->obd_name, obd->obd_recovery_timeout);
                        return 0;
-               } else {
-                       dtrq_list_dump(lut->lut_tdtd, D_HA);
                }
        }
 
@@ -2123,7 +2250,8 @@ static __u64 get_next_replay_req_transno(struct obd_device *obd)
 
        return transno;
 }
-__u64 get_next_transno(struct lu_target *lut, int *type)
+
+static __u64 get_next_transno(struct lu_target *lut, int *type)
 {
        struct obd_device *obd = lut->lut_obd;
        struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
@@ -2164,7 +2292,7 @@ static void drop_duplicate_replay_req(struct lu_env *env,
                                      struct obd_device *obd,
                                      struct ptlrpc_request *req)
 {
-       DEBUG_REQ(D_HA, req, "remove t"LPD64" from %s because of duplicate"
+       DEBUG_REQ(D_HA, req, "remove t%lld from %s because of duplicate"
                  " update records are found.\n",
                  lustre_msg_get_transno(req->rq_reqmsg),
                  libcfs_nid2str(req->rq_peer.nid));
@@ -2198,7 +2326,7 @@ static void replay_request_or_update(struct lu_env *env,
        __u64                   transno;
        ENTRY;
 
-       CDEBUG(D_HA, "Waiting for transno "LPD64"\n",
+       CDEBUG(D_HA, "Waiting for transno %lld\n",
               obd->obd_next_recovery_transno);
 
        /* Replay all of request and update by transno */
@@ -2215,9 +2343,10 @@ static void replay_request_or_update(struct lu_env *env,
                CFS_FAIL_TIMEOUT_MS(OBD_FAIL_TGT_REPLAY_DELAY, 300);
 
                if (target_recovery_overseer(lut, check_for_next_transno,
-                                            exp_req_replay_healthy)) {
+                                       exp_req_replay_healthy_or_from_mdt)) {
                        abort_req_replay_queue(obd);
                        abort_lock_replay_queue(obd);
+                       goto abort;
                }
 
                spin_lock(&obd->obd_recovery_task_lock);
@@ -2252,7 +2381,7 @@ static void replay_request_or_update(struct lu_env *env,
                        }
 
                        LASSERT(trd->trd_processing_task == current_pid());
-                       DEBUG_REQ(D_HA, req, "processing t"LPD64" from %s",
+                       DEBUG_REQ(D_HA, req, "processing t%lld from %s",
                                  lustre_msg_get_transno(req->rq_reqmsg),
                                  libcfs_nid2str(req->rq_peer.nid));
 
@@ -2270,38 +2399,42 @@ static void replay_request_or_update(struct lu_env *env,
                        obd->obd_replayed_requests++;
                } else if (type == UPDATE_RECOVERY && transno != 0) {
                        struct distribute_txn_replay_req *dtrq;
+                       int rc;
 
                        spin_unlock(&obd->obd_recovery_task_lock);
 
                        LASSERT(tdtd != NULL);
                        dtrq = distribute_txn_get_next_req(tdtd);
                        lu_context_enter(&thread->t_env->le_ctx);
-                       tdtd->tdtd_replay_handler(env, tdtd, dtrq);
+                       rc = tdtd->tdtd_replay_handler(env, tdtd, dtrq);
                        lu_context_exit(&thread->t_env->le_ctx);
                        extend_recovery_timer(obd, obd_timeout, true);
 
-                       /* Add it to the replay finish list */
-                       spin_lock(&tdtd->tdtd_replay_list_lock);
-                       if (dtrq->dtrq_xid != 0) {
-                               CDEBUG(D_HA, "Move x"LPU64" t"LPU64
+                       if (rc == 0 && dtrq->dtrq_xid != 0) {
+                               CDEBUG(D_HA, "Move x%llu t%llu"
                                       " to finish list\n", dtrq->dtrq_xid,
                                       dtrq->dtrq_master_transno);
+
+                               /* Add it to the replay finish list */
+                               spin_lock(&tdtd->tdtd_replay_list_lock);
                                list_add(&dtrq->dtrq_list,
                                         &tdtd->tdtd_replay_finish_list);
+                               spin_unlock(&tdtd->tdtd_replay_list_lock);
+
+                               spin_lock(&obd->obd_recovery_task_lock);
+                               if (transno == obd->obd_next_recovery_transno)
+                                       obd->obd_next_recovery_transno++;
+                               else if (transno >
+                                        obd->obd_next_recovery_transno)
+                                       obd->obd_next_recovery_transno =
+                                                               transno + 1;
+                               spin_unlock(&obd->obd_recovery_task_lock);
                        } else {
                                dtrq_destroy(dtrq);
                        }
-                       spin_unlock(&tdtd->tdtd_replay_list_lock);
-
-                       spin_lock(&obd->obd_recovery_task_lock);
-                       if (transno == obd->obd_next_recovery_transno)
-                               obd->obd_next_recovery_transno++;
-                       else if (transno > obd->obd_next_recovery_transno)
-                               obd->obd_next_recovery_transno = transno + 1;
-                       spin_unlock(&obd->obd_recovery_task_lock);
-
                } else {
                        spin_unlock(&obd->obd_recovery_task_lock);
+abort:
                        LASSERT(list_empty(&obd->obd_req_replay_queue));
                        LASSERT(atomic_read(&obd->obd_req_replay_clients) == 0);
                        /** evict exports failed VBR */
@@ -2367,7 +2500,7 @@ static int target_recovery_thread(void *arg)
 
        /* next stage: replay requests or update */
        delta = jiffies;
-       CDEBUG(D_INFO, "1: request replay stage - %d clients from t"LPU64"\n",
+       CDEBUG(D_INFO, "1: request replay stage - %d clients from t%llu\n",
               atomic_read(&obd->obd_req_replay_clients),
               obd->obd_next_recovery_transno);
        replay_request_or_update(env, lut, trd, thread);
@@ -2442,14 +2575,19 @@ static int target_start_recovery_thread(struct lu_target *lut,
        struct obd_device *obd = lut->lut_obd;
        int rc = 0;
        struct target_recovery_data *trd = &obd->obd_recovery_data;
+       int index;
 
        memset(trd, 0, sizeof(*trd));
        init_completion(&trd->trd_starting);
        init_completion(&trd->trd_finishing);
        trd->trd_recovery_handler = handler;
 
+       rc = server_name2index(obd->obd_name, &index, NULL);
+       if (rc < 0)
+               return rc;
+
        if (!IS_ERR(kthread_run(target_recovery_thread,
-                               lut, "tgt_recov"))) {
+                               lut, "tgt_recover_%d", index))) {
                wait_for_completion(&trd->trd_starting);
                LASSERT(obd->obd_recovering != 0);
        } else {
@@ -2488,9 +2626,9 @@ 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;
@@ -2499,24 +2637,28 @@ 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 "LPU64"\n", obd->obd_name,
+              "last_transno %llu\n", obd->obd_name,
               obd->obd_max_recoverable_clients, obd->obd_last_committed);
         LASSERT(obd->obd_stopping == 0);
         obd->obd_next_recovery_transno = obd->obd_last_committed + 1;
         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);
 
@@ -2578,15 +2720,46 @@ int target_queue_recovery_request(struct ptlrpc_request *req,
                wake_up(&obd->obd_next_transno_waitq);
                spin_lock(&obd->obd_recovery_task_lock);
                if (obd->obd_recovering) {
+                       struct ptlrpc_request *tmp;
+                       struct ptlrpc_request *duplicate = NULL;
+
+                       if (likely(!req->rq_export->exp_replay_done)) {
+                               req->rq_export->exp_replay_done = 1;
+                               list_add_tail(&req->rq_list,
+                                             &obd->obd_final_req_queue);
+                               spin_unlock(&obd->obd_recovery_task_lock);
+                               RETURN(0);
+                       }
+
+                       /* XXX O(n), but only happens if final ping is
+                        * timed out, probably reorganize the list as
+                        * a hash list later */
+                       list_for_each_entry_safe(reqiter, tmp,
+                                                &obd->obd_final_req_queue,
+                                                rq_list) {
+                               if (reqiter->rq_export == req->rq_export) {
+                                       list_del_init(&reqiter->rq_list);
+                                       duplicate = reqiter;
+                                       break;
+                               }
+                       }
+
                        list_add_tail(&req->rq_list,
-                                         &obd->obd_final_req_queue);
+                                     &obd->obd_final_req_queue);
+                       req->rq_export->exp_replay_done = 1;
+                       spin_unlock(&obd->obd_recovery_task_lock);
+
+                       if (duplicate != NULL) {
+                               DEBUG_REQ(D_HA, duplicate,
+                                         "put prev final req\n");
+                               target_request_copy_put(duplicate);
+                       }
+                       RETURN(0);
                } else {
                        spin_unlock(&obd->obd_recovery_task_lock);
                        target_request_copy_put(req);
                        RETURN(obd->obd_stopping ? -ENOTCONN : 1);
                }
-               spin_unlock(&obd->obd_recovery_task_lock);
-               RETURN(0);
        }
        if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
                /* client declares he's ready to replay locks */
@@ -2627,8 +2800,8 @@ int target_queue_recovery_request(struct ptlrpc_request *req,
          * Also, a resent, replayed request that has already been
          * handled will pass through here and be processed immediately.
          */
-        CDEBUG(D_HA, "Next recovery transno: "LPU64
-               ", current: "LPU64", replaying\n",
+       CDEBUG(D_HA, "Next recovery transno: %llu"
+              ", current: %llu, replaying\n",
                obd->obd_next_recovery_transno, transno);
 
        /* If the request has been replayed by update replay, then sends this
@@ -2708,7 +2881,7 @@ void target_committed_to_req(struct ptlrpc_request *req)
                           "%d)", exp->exp_obd->obd_no_transno,
                           req->rq_repmsg == NULL);
 
-        CDEBUG(D_INFO, "last_committed "LPU64", transno "LPU64", xid "LPU64"\n",
+       CDEBUG(D_INFO, "last_committed %llu, transno %llu, xid %llu\n",
                exp->exp_last_committed, req->rq_transno, req->rq_xid);
 }
 
@@ -2749,8 +2922,11 @@ static int target_send_reply_msg(struct ptlrpc_request *req,
                DEBUG_REQ(D_ERROR, req, "dropping reply");
                return -ECOMM;
        }
-       if (unlikely(lustre_msg_get_opc(req->rq_reqmsg) == MDS_REINT &&
-                    OBD_FAIL_CHECK(OBD_FAIL_MDS_REINT_MULTI_NET_REP)))
+       /* We can have a null rq_reqmsg in the event of bad signature or
+        * no context when unwrapping */
+       if (req->rq_reqmsg &&
+           unlikely(lustre_msg_get_opc(req->rq_reqmsg) == MDS_REINT &&
+           OBD_FAIL_CHECK(OBD_FAIL_MDS_REINT_MULTI_NET_REP)))
                return -ECOMM;
 
        if (unlikely(rc)) {
@@ -2811,7 +2987,7 @@ void target_send_reply(struct ptlrpc_request *req, int rc, int fail_id)
         rs->rs_opc       = lustre_msg_get_opc(req->rq_reqmsg);
 
        spin_lock(&exp->exp_uncommitted_replies_lock);
-       CDEBUG(D_NET, "rs transno = "LPU64", last committed = "LPU64"\n",
+       CDEBUG(D_NET, "rs transno = %llu, last committed = %llu\n",
               rs->rs_transno, exp->exp_last_committed);
        if (rs->rs_transno > exp->exp_last_committed) {
                /* not committed already */
@@ -3008,8 +3184,7 @@ int target_bulk_io(struct obd_export *exp, struct ptlrpc_bulk_desc *desc,
                if (req->rq_bulk_read)
                        rc = sptlrpc_svc_wrap_bulk(req, desc);
 
-               if ((exp->exp_connect_data.ocd_connect_flags &
-                    OBD_CONNECT_BULK_MBITS) != 0)
+               if (OCD_HAS_FLAG(&exp->exp_connect_data, BULK_MBITS))
                        req->rq_mbits = lustre_msg_get_mbits(req->rq_reqmsg);
                else /* old version, bulk matchbits is rq_xid */
                        req->rq_mbits = req->rq_xid;