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LU-6808 ptlrpc: properly set "rq_xid" for 4MB IO
[fs/lustre-release.git] / lustre / ptlrpc / client.c
index a1b15ef..59f4cc5 100644 (file)
@@ -27,7 +27,7 @@
  * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
  * Use is subject to license terms.
  *
- * Copyright (c) 2011, 2014, Intel Corporation.
+ * Copyright (c) 2011, 2015, Intel Corporation.
  */
 /*
  * This file is part of Lustre, http://www.lustre.org/
@@ -128,19 +128,21 @@ struct ptlrpc_bulk_desc *ptlrpc_new_bulk(unsigned nfrags, unsigned max_brw,
                (ptlrpc_is_bulk_desc_kvec(type) &&
                 ops->add_iov_frag != NULL));
 
+       OBD_ALLOC_PTR(desc);
+       if (desc == NULL)
+               return NULL;
        if (type & PTLRPC_BULK_BUF_KIOV) {
-               OBD_ALLOC(desc,
-                         offsetof(struct ptlrpc_bulk_desc,
-                                  bd_u.bd_kiov.bd_vec[nfrags]));
+               OBD_ALLOC_LARGE(GET_KIOV(desc),
+                               nfrags * sizeof(*GET_KIOV(desc)));
+               if (GET_KIOV(desc) == NULL)
+                       goto out;
        } else {
-               OBD_ALLOC(desc,
-                         offsetof(struct ptlrpc_bulk_desc,
-                                  bd_u.bd_kvec.bd_kvec[nfrags]));
+               OBD_ALLOC_LARGE(GET_KVEC(desc),
+                               nfrags * sizeof(*GET_KVEC(desc)));
+               if (GET_KVEC(desc) == NULL)
+                       goto out;
        }
 
-       if (!desc)
-               return NULL;
-
        spin_lock_init(&desc->bd_lock);
        init_waitqueue_head(&desc->bd_waitq);
        desc->bd_max_iov = nfrags;
@@ -157,6 +159,9 @@ struct ptlrpc_bulk_desc *ptlrpc_new_bulk(unsigned nfrags, unsigned max_brw,
                LNetInvalidateHandle(&desc->bd_mds[i]);
 
        return desc;
+out:
+       OBD_FREE_PTR(desc);
+       return NULL;
 }
 
 /**
@@ -207,7 +212,7 @@ void __ptlrpc_prep_bulk_page(struct ptlrpc_bulk_desc *desc,
        LASSERT(page != NULL);
        LASSERT(pageoffset >= 0);
        LASSERT(len > 0);
-       LASSERT(pageoffset + len <= PAGE_CACHE_SIZE);
+       LASSERT(pageoffset + len <= PAGE_SIZE);
        LASSERT(ptlrpc_is_bulk_desc_kiov(desc->bd_type));
 
        kiov = &BD_GET_KIOV(desc, desc->bd_iov_count);
@@ -271,13 +276,12 @@ void ptlrpc_free_bulk(struct ptlrpc_bulk_desc *desc)
                desc->bd_frag_ops->release_frags(desc);
 
        if (ptlrpc_is_bulk_desc_kiov(desc->bd_type))
-               OBD_FREE(desc, offsetof(struct ptlrpc_bulk_desc,
-                                       bd_u.bd_kiov.bd_vec[desc->bd_max_iov]));
+               OBD_FREE_LARGE(GET_KIOV(desc),
+                       desc->bd_max_iov * sizeof(*GET_KIOV(desc)));
        else
-               OBD_FREE(desc, offsetof(struct ptlrpc_bulk_desc,
-                                       bd_u.bd_kvec.bd_kvec[desc->
-                                               bd_max_iov]));
-
+               OBD_FREE_LARGE(GET_KVEC(desc),
+                       desc->bd_max_iov * sizeof(*GET_KVEC(desc)));
+       OBD_FREE_PTR(desc);
        EXIT;
 }
 EXPORT_SYMBOL(ptlrpc_free_bulk);
@@ -553,10 +557,10 @@ int ptlrpc_add_rqs_to_pool(struct ptlrpc_request_pool *pool, int num_rq)
                if (!msg) {
                        ptlrpc_request_cache_free(req);
                        return i;
-                }
-                req->rq_reqbuf = msg;
-                req->rq_reqbuf_len = size;
-                req->rq_pool = pool;
+               }
+               req->rq_reqbuf = msg;
+               req->rq_reqbuf_len = size;
+               req->rq_pool = pool;
                spin_lock(&pool->prp_lock);
                list_add_tail(&req->rq_list, &pool->prp_req_list);
        }
@@ -651,71 +655,134 @@ static void __ptlrpc_free_req_to_pool(struct ptlrpc_request *request)
        spin_unlock(&pool->prp_lock);
 }
 
-static int __ptlrpc_request_bufs_pack(struct ptlrpc_request *request,
-                                      __u32 version, int opcode,
-                                      int count, __u32 *lengths, char **bufs,
-                                      struct ptlrpc_cli_ctx *ctx)
+void ptlrpc_add_unreplied(struct ptlrpc_request *req)
 {
-        struct obd_import  *imp = request->rq_import;
-        int                 rc;
-        ENTRY;
+       struct obd_import       *imp = req->rq_import;
+       struct list_head        *tmp;
+       struct ptlrpc_request   *iter;
 
-        if (unlikely(ctx))
-                request->rq_cli_ctx = sptlrpc_cli_ctx_get(ctx);
-        else {
-                rc = sptlrpc_req_get_ctx(request);
-                if (rc)
-                        GOTO(out_free, rc);
-        }
+       assert_spin_locked(&imp->imp_lock);
+       LASSERT(list_empty(&req->rq_unreplied_list));
 
-        sptlrpc_req_set_flavor(request, opcode);
+       /* unreplied list is sorted by xid in ascending order */
+       list_for_each_prev(tmp, &imp->imp_unreplied_list) {
+               iter = list_entry(tmp, struct ptlrpc_request,
+                                 rq_unreplied_list);
 
-        rc = lustre_pack_request(request, imp->imp_msg_magic, count,
-                                 lengths, bufs);
-        if (rc) {
-                LASSERT(!request->rq_pool);
-                GOTO(out_ctx, rc);
-        }
+               LASSERT(req->rq_xid != iter->rq_xid);
+               if (req->rq_xid < iter->rq_xid)
+                       continue;
+               list_add(&req->rq_unreplied_list, &iter->rq_unreplied_list);
+               return;
+       }
+       list_add(&req->rq_unreplied_list, &imp->imp_unreplied_list);
+}
 
-        lustre_msg_add_version(request->rq_reqmsg, version);
-        request->rq_send_state = LUSTRE_IMP_FULL;
-        request->rq_type = PTL_RPC_MSG_REQUEST;
+void ptlrpc_assign_next_xid_nolock(struct ptlrpc_request *req)
+{
+       req->rq_xid = ptlrpc_next_xid();
+       ptlrpc_add_unreplied(req);
+}
 
-        request->rq_req_cbid.cbid_fn  = request_out_callback;
-        request->rq_req_cbid.cbid_arg = request;
+static inline void ptlrpc_assign_next_xid(struct ptlrpc_request *req)
+{
+       spin_lock(&req->rq_import->imp_lock);
+       ptlrpc_assign_next_xid_nolock(req);
+       spin_unlock(&req->rq_import->imp_lock);
+}
+
+int ptlrpc_request_bufs_pack(struct ptlrpc_request *request,
+                            __u32 version, int opcode, char **bufs,
+                            struct ptlrpc_cli_ctx *ctx)
+{
+       int count;
+       struct obd_import *imp;
+       __u32 *lengths;
+       int rc;
 
-        request->rq_reply_cbid.cbid_fn  = reply_in_callback;
-        request->rq_reply_cbid.cbid_arg = request;
+       ENTRY;
 
-        request->rq_reply_deadline = 0;
-        request->rq_phase = RQ_PHASE_NEW;
-        request->rq_next_phase = RQ_PHASE_UNDEFINED;
+       count = req_capsule_filled_sizes(&request->rq_pill, RCL_CLIENT);
+       imp = request->rq_import;
+       lengths = request->rq_pill.rc_area[RCL_CLIENT];
 
-        request->rq_request_portal = imp->imp_client->cli_request_portal;
-        request->rq_reply_portal = imp->imp_client->cli_reply_portal;
+       if (ctx != NULL) {
+               request->rq_cli_ctx = sptlrpc_cli_ctx_get(ctx);
+       } else {
+               rc = sptlrpc_req_get_ctx(request);
+               if (rc)
+                       GOTO(out_free, rc);
+       }
+       sptlrpc_req_set_flavor(request, opcode);
 
-        ptlrpc_at_set_req_timeout(request);
+       rc = lustre_pack_request(request, imp->imp_msg_magic, count,
+                                lengths, bufs);
+       if (rc)
+               GOTO(out_ctx, rc);
+
+       lustre_msg_add_version(request->rq_reqmsg, version);
+       request->rq_send_state = LUSTRE_IMP_FULL;
+       request->rq_type = PTL_RPC_MSG_REQUEST;
+
+       request->rq_req_cbid.cbid_fn  = request_out_callback;
+       request->rq_req_cbid.cbid_arg = request;
+
+       request->rq_reply_cbid.cbid_fn  = reply_in_callback;
+       request->rq_reply_cbid.cbid_arg = request;
+
+       request->rq_reply_deadline = 0;
+       request->rq_bulk_deadline = 0;
+       request->rq_req_deadline = 0;
+       request->rq_phase = RQ_PHASE_NEW;
+       request->rq_next_phase = RQ_PHASE_UNDEFINED;
+
+       request->rq_request_portal = imp->imp_client->cli_request_portal;
+       request->rq_reply_portal = imp->imp_client->cli_reply_portal;
+
+       ptlrpc_at_set_req_timeout(request);
 
        lustre_msg_set_opc(request->rq_reqmsg, opcode);
+       ptlrpc_assign_next_xid(request);
+
+       /* Let's setup deadline for req/reply/bulk unlink for opcode. */
+       if (cfs_fail_val == opcode) {
+               time_t *fail_t = NULL, *fail2_t = NULL;
+
+               if (CFS_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_BULK_UNLINK))
+                       fail_t = &request->rq_bulk_deadline;
+               else if (CFS_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_REPL_UNLINK))
+                       fail_t = &request->rq_reply_deadline;
+               else if (CFS_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_REQ_UNLINK))
+                       fail_t = &request->rq_req_deadline;
+               else if (CFS_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_BOTH_UNLINK)) {
+                       fail_t = &request->rq_reply_deadline;
+                       fail2_t = &request->rq_bulk_deadline;
+               }
+
+               if (fail_t) {
+                       *fail_t = cfs_time_current_sec() + LONG_UNLINK;
+
+                       if (fail2_t)
+                               *fail2_t = cfs_time_current_sec() + LONG_UNLINK;
+
+                       /* The RPC is infected, let the test to change the
+                        * fail_loc */
+                       set_current_state(TASK_UNINTERRUPTIBLE);
+                       schedule_timeout(cfs_time_seconds(2));
+                       set_current_state(TASK_RUNNING);
+               }
+       }
 
        RETURN(0);
+
 out_ctx:
+       LASSERT(!request->rq_pool);
        sptlrpc_cli_ctx_put(request->rq_cli_ctx, 1);
 out_free:
        class_import_put(imp);
-       return rc;
-}
 
-int ptlrpc_request_bufs_pack(struct ptlrpc_request *request,
-                             __u32 version, int opcode, char **bufs,
-                             struct ptlrpc_cli_ctx *ctx)
-{
-        int count;
+       return rc;
 
-        count = req_capsule_filled_sizes(&request->rq_pill, RCL_CLIENT);
-        return __ptlrpc_request_bufs_pack(request, version, opcode, count,
-                                          request->rq_pill.rc_area[RCL_CLIENT],
-                                          bufs, ctx);
 }
 EXPORT_SYMBOL(ptlrpc_request_bufs_pack);
 
@@ -871,46 +938,6 @@ struct ptlrpc_request *ptlrpc_request_alloc_pack(struct obd_import *imp,
 EXPORT_SYMBOL(ptlrpc_request_alloc_pack);
 
 /**
- * Prepare request (fetched from pool \a poolif not NULL) on import \a imp
- * for operation \a opcode. Request would contain \a count buffers.
- * Sizes of buffers are described in array \a lengths and buffers themselves
- * are provided by a pointer \a bufs.
- * Returns prepared request structure pointer or NULL on error.
- */
-struct ptlrpc_request *
-ptlrpc_prep_req_pool(struct obd_import *imp,
-                     __u32 version, int opcode,
-                     int count, __u32 *lengths, char **bufs,
-                     struct ptlrpc_request_pool *pool)
-{
-        struct ptlrpc_request *request;
-        int                    rc;
-
-        request = __ptlrpc_request_alloc(imp, pool);
-        if (!request)
-                return NULL;
-
-        rc = __ptlrpc_request_bufs_pack(request, version, opcode, count,
-                                        lengths, bufs, NULL);
-        if (rc) {
-                ptlrpc_request_free(request);
-                request = NULL;
-        }
-        return request;
-}
-
-/**
- * Same as ptlrpc_prep_req_pool, but without pool
- */
-struct ptlrpc_request *
-ptlrpc_prep_req(struct obd_import *imp, __u32 version, int opcode, int count,
-                __u32 *lengths, char **bufs)
-{
-        return ptlrpc_prep_req_pool(imp, version, opcode, count, lengths, bufs,
-                                    NULL);
-}
-
-/**
  * Allocate and initialize new request set structure on the current CPT.
  * Returns a pointer to the newly allocated set structure or NULL on error.
  */
@@ -1056,6 +1083,9 @@ void ptlrpc_set_add_req(struct ptlrpc_request_set *set,
 {
        LASSERT(list_empty(&req->rq_set_chain));
 
+       if (req->rq_allow_intr)
+               set->set_allow_intr = 1;
+
        /* The set takes over the caller's request reference */
        list_add_tail(&req->rq_set_chain, &set->set_requests);
        req->rq_set = set;
@@ -1264,12 +1294,30 @@ static void ptlrpc_save_versions(struct ptlrpc_request *req)
 
         LASSERT(versions);
         lustre_msg_set_versions(reqmsg, versions);
-        CDEBUG(D_INFO, "Client save versions ["LPX64"/"LPX64"]\n",
+       CDEBUG(D_INFO, "Client save versions [%#llx/%#llx]\n",
                versions[0], versions[1]);
 
         EXIT;
 }
 
+__u64 ptlrpc_known_replied_xid(struct obd_import *imp)
+{
+       struct ptlrpc_request *req;
+
+       assert_spin_locked(&imp->imp_lock);
+       if (list_empty(&imp->imp_unreplied_list))
+               return 0;
+
+       req = list_entry(imp->imp_unreplied_list.next, struct ptlrpc_request,
+                        rq_unreplied_list);
+       LASSERTF(req->rq_xid >= 1, "XID:%llu\n", req->rq_xid);
+
+       if (imp->imp_known_replied_xid < req->rq_xid - 1)
+               imp->imp_known_replied_xid = req->rq_xid - 1;
+
+       return req->rq_xid - 1;
+}
+
 /**
  * Callback function called when client receives RPC reply for \a req.
  * Returns 0 on success or error code.
@@ -1283,6 +1331,7 @@ static int after_reply(struct ptlrpc_request *req)
         struct obd_device *obd = req->rq_import->imp_obd;
         int rc;
         struct timeval work_start;
+       __u64 committed;
         long timediff;
         ENTRY;
 
@@ -1356,6 +1405,11 @@ static int after_reply(struct ptlrpc_request *req)
                else
                        req->rq_sent = now + req->rq_nr_resend;
 
+               /* Resend for EINPROGRESS will use a new XID */
+               spin_lock(&imp->imp_lock);
+               list_del_init(&req->rq_unreplied_list);
+               spin_unlock(&imp->imp_lock);
+
                RETURN(0);
        }
 
@@ -1437,10 +1491,9 @@ static int after_reply(struct ptlrpc_request *req)
                 /*
                  * Replay-enabled imports return commit-status information.
                  */
-                if (lustre_msg_get_last_committed(req->rq_repmsg)) {
-                        imp->imp_peer_committed_transno =
-                                lustre_msg_get_last_committed(req->rq_repmsg);
-                }
+               committed = lustre_msg_get_last_committed(req->rq_repmsg);
+               if (likely(committed > imp->imp_peer_committed_transno))
+                       imp->imp_peer_committed_transno = committed;
 
                ptlrpc_free_committed(imp);
 
@@ -1472,12 +1525,18 @@ static int after_reply(struct ptlrpc_request *req)
 static int ptlrpc_send_new_req(struct ptlrpc_request *req)
 {
         struct obd_import     *imp = req->rq_import;
-       struct list_head      *tmp;
-       __u64                  min_xid = ~0ULL;
+       __u64                  min_xid = 0;
         int rc;
         ENTRY;
 
         LASSERT(req->rq_phase == RQ_PHASE_NEW);
+
+       /* do not try to go further if there is not enough memory in enc_pool */
+       if (req->rq_sent && req->rq_bulk != NULL)
+               if (req->rq_bulk->bd_iov_count > get_free_pages_in_pool() &&
+                   pool_is_at_full_capacity())
+                       RETURN(-ENOMEM);
+
         if (req->rq_sent && (req->rq_sent > cfs_time_current_sec()) &&
             (!req->rq_generation_set ||
              req->rq_import_generation == imp->imp_generation))
@@ -1487,15 +1546,8 @@ static int ptlrpc_send_new_req(struct ptlrpc_request *req)
 
        spin_lock(&imp->imp_lock);
 
-       /* the very first time we assign XID. it's important to assign XID
-        * and put it on the list atomically, so that the lowest assigned
-        * XID is always known. this is vital for multislot last_rcvd */
-       if (req->rq_send_state == LUSTRE_IMP_REPLAY) {
-               LASSERT(req->rq_xid != 0);
-       } else {
-               LASSERT(req->rq_xid == 0);
-               req->rq_xid = ptlrpc_next_xid();
-       }
+       LASSERT(req->rq_xid != 0);
+       LASSERT(!list_empty(&req->rq_unreplied_list));
 
        if (!req->rq_generation_set)
                req->rq_import_generation = imp->imp_generation;
@@ -1527,23 +1579,23 @@ static int ptlrpc_send_new_req(struct ptlrpc_request *req)
        list_add_tail(&req->rq_list, &imp->imp_sending_list);
        atomic_inc(&req->rq_import->imp_inflight);
 
-       /* find the lowest unreplied XID */
-       list_for_each(tmp, &imp->imp_delayed_list) {
-               struct ptlrpc_request *r;
-               r = list_entry(tmp, struct ptlrpc_request, rq_list);
-               if (r->rq_xid < min_xid)
-                       min_xid = r->rq_xid;
-       }
-       list_for_each(tmp, &imp->imp_sending_list) {
-               struct ptlrpc_request *r;
-               r = list_entry(tmp, struct ptlrpc_request, rq_list);
-               if (r->rq_xid < min_xid)
-                       min_xid = r->rq_xid;
-       }
+       /* find the known replied XID from the unreplied list, CONNECT
+        * and DISCONNECT requests are skipped to make the sanity check
+        * on server side happy. see process_req_last_xid().
+        *
+        * For CONNECT: Because replay requests have lower XID, it'll
+        * break the sanity check if CONNECT bump the exp_last_xid on
+        * server.
+        *
+        * For DISCONNECT: Since client will abort inflight RPC before
+        * sending DISCONNECT, DISCONNECT may carry an XID which higher
+        * than the inflight RPC.
+        */
+       if (!ptlrpc_req_is_connect(req) && !ptlrpc_req_is_disconnect(req))
+               min_xid = ptlrpc_known_replied_xid(imp);
        spin_unlock(&imp->imp_lock);
 
-       if (likely(min_xid != ~0ULL))
-               lustre_msg_set_last_xid(req->rq_reqmsg, min_xid - 1);
+       lustre_msg_set_last_xid(req->rq_reqmsg, min_xid);
 
        lustre_msg_set_status(req->rq_reqmsg, current_pid());
 
@@ -1561,13 +1613,23 @@ static int ptlrpc_send_new_req(struct ptlrpc_request *req)
         }
 
        CDEBUG(D_RPCTRACE, "Sending RPC pname:cluuid:pid:xid:nid:opc"
-              " %s:%s:%d:"LPU64":%s:%d\n", current_comm(),
+              " %s:%s:%d:%llu:%s:%d\n", current_comm(),
               imp->imp_obd->obd_uuid.uuid,
               lustre_msg_get_status(req->rq_reqmsg), req->rq_xid,
               libcfs_nid2str(imp->imp_connection->c_peer.nid),
               lustre_msg_get_opc(req->rq_reqmsg));
 
         rc = ptl_send_rpc(req, 0);
+       if (rc == -ENOMEM) {
+               spin_lock(&imp->imp_lock);
+               if (!list_empty(&req->rq_list)) {
+                       list_del_init(&req->rq_list);
+                       atomic_dec(&req->rq_import->imp_inflight);
+               }
+               spin_unlock(&imp->imp_lock);
+               ptlrpc_rqphase_move(req, RQ_PHASE_NEW);
+               RETURN(rc);
+       }
         if (rc) {
                 DEBUG_REQ(D_HA, req, "send failed (%d); expect timeout", rc);
                spin_lock(&req->rq_lock);
@@ -1627,8 +1689,14 @@ int ptlrpc_check_set(const struct lu_env *env, struct ptlrpc_request_set *set)
                                   rq_set_chain);
                struct obd_import *imp = req->rq_import;
                int unregistered = 0;
+               int async = 1;
                int rc = 0;
 
+               if (req->rq_phase == RQ_PHASE_COMPLETE) {
+                       list_move_tail(&req->rq_set_chain, &comp_reqs);
+                       continue;
+               }
+
                /* This schedule point is mainly for the ptlrpcd caller of this
                 * function.  Most ptlrpc sets are not long-lived and unbounded
                 * in length, but at the least the set used by the ptlrpcd is.
@@ -1637,13 +1705,26 @@ int ptlrpc_check_set(const struct lu_env *env, struct ptlrpc_request_set *set)
                 */
                cond_resched();
 
-                if (req->rq_phase == RQ_PHASE_NEW &&
-                    ptlrpc_send_new_req(req)) {
-                        force_timer_recalc = 1;
-                }
+               /* If the caller requires to allow to be interpreted by force
+                * and it has really been interpreted, then move the request
+                * to RQ_PHASE_INTERPRET phase in spite of what the current
+                * phase is. */
+               if (unlikely(req->rq_allow_intr && req->rq_intr)) {
+                       req->rq_status = -EINTR;
+                       ptlrpc_rqphase_move(req, RQ_PHASE_INTERPRET);
+
+                       /* Since it is interpreted and we have to wait for
+                        * the reply to be unlinked, then use sync mode. */
+                       async = 0;
 
-                /* delayed send - skip */
-                if (req->rq_phase == RQ_PHASE_NEW && req->rq_sent)
+                       GOTO(interpret, req->rq_status);
+               }
+
+               if (req->rq_phase == RQ_PHASE_NEW && ptlrpc_send_new_req(req))
+                       force_timer_recalc = 1;
+
+               /* delayed send - skip */
+               if (req->rq_phase == RQ_PHASE_NEW && req->rq_sent)
                        continue;
 
                /* delayed resend - skip */
@@ -1651,29 +1732,43 @@ int ptlrpc_check_set(const struct lu_env *env, struct ptlrpc_request_set *set)
                    req->rq_sent > cfs_time_current_sec())
                        continue;
 
-                if (!(req->rq_phase == RQ_PHASE_RPC ||
-                      req->rq_phase == RQ_PHASE_BULK ||
-                      req->rq_phase == RQ_PHASE_INTERPRET ||
-                      req->rq_phase == RQ_PHASE_UNREGISTERING ||
-                      req->rq_phase == RQ_PHASE_COMPLETE)) {
-                        DEBUG_REQ(D_ERROR, req, "bad phase %x", req->rq_phase);
-                        LBUG();
-                }
+               if (!(req->rq_phase == RQ_PHASE_RPC ||
+                     req->rq_phase == RQ_PHASE_BULK ||
+                     req->rq_phase == RQ_PHASE_INTERPRET ||
+                     req->rq_phase == RQ_PHASE_UNREG_RPC ||
+                     req->rq_phase == RQ_PHASE_UNREG_BULK)) {
+                       DEBUG_REQ(D_ERROR, req, "bad phase %x", req->rq_phase);
+                       LBUG();
+               }
 
-                if (req->rq_phase == RQ_PHASE_UNREGISTERING) {
-                        LASSERT(req->rq_next_phase != req->rq_phase);
-                        LASSERT(req->rq_next_phase != RQ_PHASE_UNDEFINED);
+               if (req->rq_phase == RQ_PHASE_UNREG_RPC ||
+                   req->rq_phase == RQ_PHASE_UNREG_BULK) {
+                       LASSERT(req->rq_next_phase != req->rq_phase);
+                       LASSERT(req->rq_next_phase != RQ_PHASE_UNDEFINED);
+
+                       if (req->rq_req_deadline &&
+                           !OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_REQ_UNLINK))
+                               req->rq_req_deadline = 0;
+                       if (req->rq_reply_deadline &&
+                           !OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_REPL_UNLINK))
+                               req->rq_reply_deadline = 0;
+                       if (req->rq_bulk_deadline &&
+                           !OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_BULK_UNLINK))
+                               req->rq_bulk_deadline = 0;
 
-                        /*
-                         * Skip processing until reply is unlinked. We
-                         * can't return to pool before that and we can't
-                         * call interpret before that. We need to make
-                         * sure that all rdma transfers finished and will
-                         * not corrupt any data.
-                         */
-                        if (ptlrpc_client_recv_or_unlink(req) ||
-                            ptlrpc_client_bulk_active(req))
-                                continue;
+                       /*
+                        * Skip processing until reply is unlinked. We
+                        * can't return to pool before that and we can't
+                        * call interpret before that. We need to make
+                        * sure that all rdma transfers finished and will
+                        * not corrupt any data.
+                        */
+                       if (req->rq_phase == RQ_PHASE_UNREG_RPC &&
+                           ptlrpc_client_recv_or_unlink(req))
+                               continue;
+                       if (req->rq_phase == RQ_PHASE_UNREG_BULK &&
+                           ptlrpc_client_bulk_active(req))
+                               continue;
 
                         /*
                          * Turn fail_loc off to prevent it from looping
@@ -1695,11 +1790,6 @@ int ptlrpc_check_set(const struct lu_env *env, struct ptlrpc_request_set *set)
                         ptlrpc_rqphase_move(req, req->rq_next_phase);
                 }
 
-                if (req->rq_phase == RQ_PHASE_COMPLETE) {
-                       list_move_tail(&req->rq_set_chain, &comp_reqs);
-                        continue;
-               }
-
                 if (req->rq_phase == RQ_PHASE_INTERPRET)
                         GOTO(interpret, req->rq_status);
 
@@ -1837,6 +1927,14 @@ int ptlrpc_check_set(const struct lu_env *env, struct ptlrpc_request_set *set)
                                }
 
                                rc = ptl_send_rpc(req, 0);
+                               if (rc == -ENOMEM) {
+                                       spin_lock(&imp->imp_lock);
+                                       if (!list_empty(&req->rq_list))
+                                               list_del_init(&req->rq_list);
+                                       spin_unlock(&imp->imp_lock);
+                                       ptlrpc_rqphase_move(req, RQ_PHASE_NEW);
+                                       continue;
+                               }
                                if (rc) {
                                        DEBUG_REQ(D_HA, req,
                                                  "send failed: rc = %d", rc);
@@ -1908,27 +2006,27 @@ int ptlrpc_check_set(const struct lu_env *env, struct ptlrpc_request_set *set)
                        req->rq_status = -EIO;
                }
 
-                ptlrpc_rqphase_move(req, RQ_PHASE_INTERPRET);
+               ptlrpc_rqphase_move(req, RQ_PHASE_INTERPRET);
 
-        interpret:
-                LASSERT(req->rq_phase == RQ_PHASE_INTERPRET);
+       interpret:
+               LASSERT(req->rq_phase == RQ_PHASE_INTERPRET);
 
-                /* This moves to "unregistering" phase we need to wait for
-                 * reply unlink. */
-                if (!unregistered && !ptlrpc_unregister_reply(req, 1)) {
-                        /* start async bulk unlink too */
-                        ptlrpc_unregister_bulk(req, 1);
-                        continue;
-                }
+               /* This moves to "unregistering" phase we need to wait for
+                * reply unlink. */
+               if (!unregistered && !ptlrpc_unregister_reply(req, async)) {
+                       /* start async bulk unlink too */
+                       ptlrpc_unregister_bulk(req, 1);
+                       continue;
+               }
 
-                if (!ptlrpc_unregister_bulk(req, 1))
-                        continue;
+               if (!ptlrpc_unregister_bulk(req, async))
+                       continue;
 
-                /* When calling interpret receiving already should be
-                 * finished. */
-                LASSERT(!req->rq_receiving_reply);
+               /* When calling interpret receiving already should be
+                * finished. */
+               LASSERT(!req->rq_receiving_reply);
 
-                ptlrpc_req_interpret(env, req, req->rq_status);
+               ptlrpc_req_interpret(env, req, req->rq_status);
 
                if (ptlrpcd_check_work(req)) {
                        atomic_dec(&set->set_remaining);
@@ -1938,7 +2036,7 @@ int ptlrpc_check_set(const struct lu_env *env, struct ptlrpc_request_set *set)
 
                CDEBUG(req->rq_reqmsg != NULL ? D_RPCTRACE : 0,
                        "Completed RPC pname:cluuid:pid:xid:nid:"
-                       "opc %s:%s:%d:"LPU64":%s:%d\n",
+                       "opc %s:%s:%d:%llu:%s:%d\n",
                        current_comm(), imp->imp_obd->obd_uuid.uuid,
                        lustre_msg_get_status(req->rq_reqmsg), req->rq_xid,
                        libcfs_nid2str(imp->imp_connection->c_peer.nid),
@@ -1953,6 +2051,7 @@ int ptlrpc_check_set(const struct lu_env *env, struct ptlrpc_request_set *set)
                        list_del_init(&req->rq_list);
                        atomic_dec(&imp->imp_inflight);
                }
+               list_del_init(&req->rq_unreplied_list);
                spin_unlock(&imp->imp_lock);
 
                atomic_dec(&set->set_remaining);
@@ -2013,8 +2112,8 @@ int ptlrpc_expire_one_request(struct ptlrpc_request *req, int async_unlink)
                       "timed out for sent delay" : "timed out for slow reply"),
                   req->rq_sent, req->rq_real_sent);
 
-        if (imp != NULL && obd_debug_peer_on_timeout)
-                LNetCtl(IOC_LIBCFS_DEBUG_PEER, &imp->imp_connection->c_peer);
+       if (imp != NULL && obd_debug_peer_on_timeout)
+               LNetDebugPeer(imp->imp_connection->c_peer);
 
         ptlrpc_unregister_reply(req, async_unlink);
         ptlrpc_unregister_bulk(req, async_unlink);
@@ -2136,8 +2235,12 @@ static void ptlrpc_interrupted_set(void *data)
                struct ptlrpc_request *req =
                        list_entry(tmp, struct ptlrpc_request, rq_set_chain);
 
+               if (req->rq_intr)
+                       continue;
+
                if (req->rq_phase != RQ_PHASE_RPC &&
-                   req->rq_phase != RQ_PHASE_UNREGISTERING)
+                   req->rq_phase != RQ_PHASE_UNREG_RPC &&
+                   !req->rq_allow_intr)
                        continue;
 
                ptlrpc_mark_interrupted(req);
@@ -2229,16 +2332,16 @@ int ptlrpc_set_wait(struct ptlrpc_request_set *set)
                 CDEBUG(D_RPCTRACE, "set %p going to sleep for %d seconds\n",
                        set, timeout);
 
-               if (timeout == 0 && !signal_pending(current))
-                        /*
-                         * No requests are in-flight (ether timed out
-                         * or delayed), so we can allow interrupts.
-                         * We still want to block for a limited time,
-                         * so we allow interrupts during the timeout.
-                         */
-                       lwi = LWI_TIMEOUT_INTR_ALL(cfs_time_seconds(1),
-                                                   ptlrpc_expired_set,
-                                                   ptlrpc_interrupted_set, set);
+               if ((timeout == 0 && !signal_pending(current)) ||
+                   set->set_allow_intr)
+                       /* No requests are in-flight (ether timed out
+                        * or delayed), so we can allow interrupts.
+                        * We still want to block for a limited time,
+                        * so we allow interrupts during the timeout. */
+                       lwi = LWI_TIMEOUT_INTR_ALL(
+                                       cfs_time_seconds(timeout ? timeout : 1),
+                                       ptlrpc_expired_set,
+                                       ptlrpc_interrupted_set, set);
                 else
                         /*
                          * At least one request is in flight, so no
@@ -2253,7 +2356,8 @@ int ptlrpc_set_wait(struct ptlrpc_request_set *set)
                 /* LU-769 - if we ignored the signal because it was already
                  * pending when we started, we need to handle it now or we risk
                  * it being ignored forever */
-               if (rc == -ETIMEDOUT && !lwi.lwi_allow_intr &&
+               if (rc == -ETIMEDOUT &&
+                   (!lwi.lwi_allow_intr || set->set_allow_intr) &&
                    signal_pending(current)) {
                        sigset_t blocked_sigs =
                                           cfs_block_sigsinv(LUSTRE_FATAL_SIGS);
@@ -2350,6 +2454,7 @@ static void __ptlrpc_free_req(struct ptlrpc_request *request, int locked)
                if (!locked)
                        spin_lock(&request->rq_import->imp_lock);
                list_del_init(&request->rq_replay_list);
+               list_del_init(&request->rq_unreplied_list);
                if (!locked)
                        spin_unlock(&request->rq_import->imp_lock);
         }
@@ -2460,12 +2565,11 @@ static int ptlrpc_unregister_reply(struct ptlrpc_request *request, int async)
         */
        LASSERT(!in_interrupt());
 
-       /*
-        * Let's setup deadline for reply unlink.
-        */
-        if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_REPL_UNLINK) &&
-            async && request->rq_reply_deadline == 0)
-                request->rq_reply_deadline = cfs_time_current_sec()+LONG_UNLINK;
+       /* Let's setup deadline for reply unlink. */
+       if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_REPL_UNLINK) &&
+           async && request->rq_reply_deadline == 0 && cfs_fail_val == 0)
+               request->rq_reply_deadline =
+                       cfs_time_current_sec() + LONG_UNLINK;
 
         /*
          * Nothing left to do.
@@ -2481,10 +2585,8 @@ static int ptlrpc_unregister_reply(struct ptlrpc_request *request, int async)
         if (!ptlrpc_client_recv_or_unlink(request))
                 RETURN(1);
 
-        /*
-         * Move to "Unregistering" phase as reply was not unlinked yet.
-         */
-        ptlrpc_rqphase_move(request, RQ_PHASE_UNREGISTERING);
+       /* Move to "Unregistering" phase as reply was not unlinked yet. */
+       ptlrpc_rqphase_move(request, RQ_PHASE_UNREG_RPC);
 
         /*
          * Do not wait for unlink to finish.
@@ -2576,11 +2678,11 @@ void ptlrpc_free_committed(struct obd_import *imp)
 
         if (imp->imp_peer_committed_transno == imp->imp_last_transno_checked &&
             imp->imp_generation == imp->imp_last_generation_checked) {
-                CDEBUG(D_INFO, "%s: skip recheck: last_committed "LPU64"\n",
+               CDEBUG(D_INFO, "%s: skip recheck: last_committed %llu\n",
                        imp->imp_obd->obd_name, imp->imp_peer_committed_transno);
                RETURN_EXIT;
         }
-        CDEBUG(D_RPCTRACE, "%s: committing for last_committed "LPU64" gen %d\n",
+       CDEBUG(D_RPCTRACE, "%s: committing for last_committed %llu gen %d\n",
                imp->imp_obd->obd_name, imp->imp_peer_committed_transno,
                imp->imp_generation);
 
@@ -2619,7 +2721,7 @@ void ptlrpc_free_committed(struct obd_import *imp)
                        continue;
                }
 
-                DEBUG_REQ(D_INFO, req, "commit (last_committed "LPU64")",
+               DEBUG_REQ(D_INFO, req, "commit (last_committed %llu)",
                           imp->imp_peer_committed_transno);
 free_req:
                ptlrpc_free_request(req);
@@ -2839,7 +2941,7 @@ static int ptlrpc_replay_interpret(const struct lu_env *env,
                 LASSERTF(lustre_msg_get_transno(req->rq_reqmsg) ==
                          lustre_msg_get_transno(req->rq_repmsg) ||
                          lustre_msg_get_transno(req->rq_repmsg) == 0,
-                         LPX64"/"LPX64"\n",
+                        "%#llx/%#llx\n",
                          lustre_msg_get_transno(req->rq_reqmsg),
                          lustre_msg_get_transno(req->rq_repmsg));
         }
@@ -2855,8 +2957,8 @@ static int ptlrpc_replay_interpret(const struct lu_env *env,
         /* transaction number shouldn't be bigger than the latest replayed */
         if (req->rq_transno > lustre_msg_get_transno(req->rq_reqmsg)) {
                 DEBUG_REQ(D_ERROR, req,
-                          "Reported transno "LPU64" is bigger than the "
-                          "replayed one: "LPU64, req->rq_transno,
+                         "Reported transno %llu is bigger than the "
+                         "replayed one: %llu", req->rq_transno,
                           lustre_msg_get_transno(req->rq_reqmsg));
                 GOTO(out, rc = -EINVAL);
         }
@@ -2872,6 +2974,49 @@ static int ptlrpc_replay_interpret(const struct lu_env *env,
                 DEBUG_REQ(D_ERROR, req, "status %d, old was %d",
                           lustre_msg_get_status(req->rq_repmsg),
                           aa->praa_old_status);
+
+               /* Note: If the replay fails for MDT-MDT recovery, let's
+                * abort all of the following requests in the replay
+                * and sending list, because MDT-MDT update requests
+                * are dependent on each other, see LU-7039 */
+               if (imp->imp_connect_flags_orig & OBD_CONNECT_MDS_MDS) {
+                       struct ptlrpc_request *free_req;
+                       struct ptlrpc_request *tmp;
+
+                       spin_lock(&imp->imp_lock);
+                       list_for_each_entry_safe(free_req, tmp,
+                                                &imp->imp_replay_list,
+                                                rq_replay_list) {
+                               ptlrpc_free_request(free_req);
+                       }
+
+                       list_for_each_entry_safe(free_req, tmp,
+                                                &imp->imp_committed_list,
+                                                rq_replay_list) {
+                               ptlrpc_free_request(free_req);
+                       }
+
+                       list_for_each_entry_safe(free_req, tmp,
+                                               &imp->imp_delayed_list,
+                                               rq_list) {
+                               spin_lock(&free_req->rq_lock);
+                               free_req->rq_err = 1;
+                               free_req->rq_status = -EIO;
+                               ptlrpc_client_wake_req(free_req);
+                               spin_unlock(&free_req->rq_lock);
+                       }
+
+                       list_for_each_entry_safe(free_req, tmp,
+                                               &imp->imp_sending_list,
+                                               rq_list) {
+                               spin_lock(&free_req->rq_lock);
+                               free_req->rq_err = 1;
+                               free_req->rq_status = -EIO;
+                               ptlrpc_client_wake_req(free_req);
+                               spin_unlock(&free_req->rq_lock);
+                       }
+                       spin_unlock(&imp->imp_lock);
+               }
         } else {
                 /* Put it back for re-replay. */
                 lustre_msg_set_status(req->rq_repmsg, aa->praa_old_status);
@@ -3097,20 +3242,23 @@ void ptlrpc_set_bulk_mbits(struct ptlrpc_request *req)
 
        LASSERT(bd != NULL);
 
-       if (!req->rq_resend || req->rq_nr_resend != 0) {
+       if (!req->rq_resend) {
                /* this request has a new xid, just use it as bulk matchbits */
                req->rq_mbits = req->rq_xid;
 
        } else { /* needs to generate a new matchbits for resend */
                __u64   old_mbits = req->rq_mbits;
 
-               if ((bd->bd_import->imp_connect_data.ocd_connect_flags &
-                   OBD_CONNECT_BULK_MBITS) != 0)
+               if (OCD_HAS_FLAG(&bd->bd_import->imp_connect_data, BULK_MBITS)){
                        req->rq_mbits = ptlrpc_next_xid();
-               else /* old version transfers rq_xid to peer as matchbits */
-                       req->rq_mbits = req->rq_xid = ptlrpc_next_xid();
-
-               CDEBUG(D_HA, "resend bulk old x"LPU64" new x"LPU64"\n",
+               } else {/* old version transfers rq_xid to peer as matchbits */
+                       spin_lock(&req->rq_import->imp_lock);
+                       list_del_init(&req->rq_unreplied_list);
+                       ptlrpc_assign_next_xid_nolock(req);
+                       req->rq_mbits = req->rq_xid;
+                       spin_unlock(&req->rq_import->imp_lock);
+               }
+               CDEBUG(D_HA, "resend bulk old x%llu new x%llu\n",
                       old_mbits, req->rq_mbits);
        }
 
@@ -3119,6 +3267,11 @@ void ptlrpc_set_bulk_mbits(struct ptlrpc_request *req)
         * see LU-1431 */
        req->rq_mbits += ((bd->bd_iov_count + LNET_MAX_IOV - 1) /
                          LNET_MAX_IOV) - 1;
+
+       /* Set rq_xid as rq_mbits to indicate the final bulk for the old
+        * server which does not support OBD_CONNECT_BULK_MBITS. LU-6808 */
+       if (!OCD_HAS_FLAG(&bd->bd_import->imp_connect_data, BULK_MBITS))
+               req->rq_xid = req->rq_mbits;
 }
 
 /**
@@ -3171,7 +3324,6 @@ static void ptlrpcd_add_work_req(struct ptlrpc_request *req)
        req->rq_timeout         = obd_timeout;
        req->rq_sent            = cfs_time_current_sec();
        req->rq_deadline        = req->rq_sent + req->rq_timeout;
-       req->rq_reply_deadline  = req->rq_deadline;
        req->rq_phase           = RQ_PHASE_INTERPRET;
        req->rq_next_phase      = RQ_PHASE_COMPLETE;
        req->rq_xid             = ptlrpc_next_xid();