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  * considered full when less than ?_MAXREQSIZE is left in them.
  */
 
-#define LDLM_THREADS_AUTO_MIN                                                 \
-        min((int)(num_online_cpus() * num_online_cpus() * 2), 8)
-#define LDLM_THREADS_AUTO_MAX (LDLM_THREADS_AUTO_MIN * 16)
+#define LDLM_THREADS_AUTO_MIN (2)
+#define LDLM_THREADS_AUTO_MAX min(num_online_cpus()*num_online_cpus()*32, 128)
 #define LDLM_BL_THREADS  LDLM_THREADS_AUTO_MIN
 #define LDLM_NBUFS      (64 * num_online_cpus())
 #define LDLM_BUFSIZE    (8 * 1024)
  * except in the open case where there are a large number of OSTs in a LOV.
  */
 #define MDS_MAXREQSIZE  (5 * 1024)
-#define MDS_MAXREPSIZE  max(9 * 1024, 280 + LOV_MAX_STRIPE_COUNT * 56)
+#define MDS_MAXREPSIZE  max(9 * 1024, 362 + LOV_MAX_STRIPE_COUNT * 56)
 
 /* FLD_MAXREQSIZE == lustre_msg + __u32 padding + ptlrpc_body + opc + md_fld */
 #define FLD_MAXREQSIZE  (160)
@@ -260,7 +259,9 @@ struct ptlrpc_reply_state {
 #if RS_DEBUG
         struct list_head       rs_debug_list;
 #endif
-        /* updates to following flag serialised by srv_request_lock */
+        /* A spinlock to protect the reply state flags */
+        spinlock_t             rs_lock;
+        /* Reply state flags */
         unsigned long          rs_difficult:1;     /* ACK/commit stuff */
         unsigned long          rs_no_ack:1;    /* no ACK, even for
                                                   difficult requests */
@@ -271,6 +272,7 @@ struct ptlrpc_reply_state {
         unsigned long          rs_prealloc:1; /* rs from prealloc list */
 
         int                    rs_size;
+        __u32                  rs_opc;
         __u64                  rs_transno;
         __u64                  rs_xid;
         struct obd_export     *rs_export;
@@ -342,6 +344,8 @@ struct ptlrpc_request {
         struct list_head rq_exp_list;           /* server-side per-export list */
         struct ptlrpc_hpreq_ops *rq_ops;        /* server-side hp handlers */
         __u64            rq_history_seq;        /* history sequence # */
+        /* the index of service's srv_at_array into which request is linked */
+        time_t rq_at_index;
         int rq_status;
         spinlock_t rq_lock;
         /* client-side flags are serialized by rq_lock */
@@ -352,20 +356,20 @@ struct ptlrpc_request {
                  * after server commits corresponding transaction. This is
                  * used for operations that require sequence of multiple
                  * requests to be replayed. The only example currently is file
-                 * open/close/dw/setattr. When last request in such a sequence
-                 * is committed, ->rq_replay is cleared on all requests in the
+                 * open/close. When last request in such a sequence is
+                 * committed, ->rq_replay is cleared on all requests in the
                  * sequence.
                  */
                 rq_replay:1,
-                /* this is the last request in the sequence. */
-                rq_sequence:1,
                 rq_no_resend:1, rq_waiting:1, rq_receiving_reply:1,
                 rq_no_delay:1, rq_net_err:1, rq_wait_ctx:1,
                 rq_early:1, rq_must_unlink:1,
+                rq_fake:1,          /* this fake req */
                 /* server-side flags */
                 rq_packed_final:1,  /* packed final reply */
                 rq_sent_final:1,    /* stop sending early replies */
-                rq_hp:1;            /* high priority RPC */
+                rq_hp:1,            /* high priority RPC */
+                rq_at_linked:1;     /* link into service's srv_at_array */
 
         enum rq_phase rq_phase; /* one of RQ_PHASE_* */
         enum rq_phase rq_next_phase; /* one of RQ_PHASE_* to be used next */
@@ -387,7 +391,6 @@ struct ptlrpc_request {
         __u64 rq_transno;
         __u64 rq_xid;
         struct list_head rq_replay_list;
-        struct list_head rq_mod_list;
 
         struct ptlrpc_cli_ctx   *rq_cli_ctx;     /* client's half ctx */
         struct ptlrpc_svc_ctx   *rq_svc_ctx;     /* server's half ctx */
@@ -477,6 +480,7 @@ struct ptlrpc_request {
                so that servers' early reply updates to the deadline aren't
                kept in per-cpu cache */
         time_t rq_reply_deadline;        /* when req reply unlink must finish. */
+        time_t rq_bulk_deadline;         /* when req bulk unlink must finish. */
         int    rq_timeout;               /* service time estimate (secs) */
 
         /* Multi-rpc bits */
@@ -493,12 +497,16 @@ struct ptlrpc_request {
         struct req_capsule          rq_pill;
 };
 
-static inline void ptlrpc_close_replay_seq(struct ptlrpc_request *req)
+static inline int ptlrpc_req_interpret(const struct lu_env *env,
+                                       struct ptlrpc_request *req, int rc)
 {
-        spin_lock(&req->rq_lock);
-        req->rq_replay = 0;
-        req->rq_sequence = 1;
-        spin_unlock(&req->rq_lock);
+        if (req->rq_interpret_reply != NULL) {
+                req->rq_status = req->rq_interpret_reply(env, req,
+                                                         &req->rq_async_args,
+                                                         rc);
+                return req->rq_status;
+        }
+        return rc;
 }
 
 static inline void lustre_set_req_swabbed(struct ptlrpc_request *req, int index)
@@ -633,8 +641,12 @@ struct ptlrpc_bulk_desc {
         lnet_handle_md_t       bd_md_h;         /* associated MD */
         lnet_nid_t             bd_sender;       /* stash event::sender */
 
-        cfs_page_t           **bd_enc_pages;
 #if defined(__KERNEL__)
+        /*
+         * encrypt iov, size is either 0 or bd_iov_count.
+         */
+        lnet_kiov_t           *bd_enc_iov;
+
         lnet_kiov_t            bd_iov[0];
 #else
         lnet_md_iovec_t        bd_iov[0];
@@ -659,6 +671,10 @@ struct ptlrpc_thread {
          * put watchdog in the structure per thread b=14840
          */
         struct lc_watchdog *t_watchdog;
+        /**
+         * the svc this thread belonged to b=18582
+         */
+        struct ptlrpc_service *t_svc;
         cfs_waitq_t t_ctl_waitq;
         struct lu_env *t_env;
 };
@@ -691,7 +707,7 @@ struct ptlrpc_service {
         int              srv_threads_max;       /* thread upper limit */
         int              srv_threads_started;   /* index of last started thread */
         int              srv_threads_running;   /* # running threads */
-        int              srv_n_difficult_replies; /* # 'difficult' replies */
+        atomic_t         srv_n_difficult_replies; /* # 'difficult' replies */
         int              srv_n_active_reqs;     /* # reqs being served */
         int              srv_n_hpreq;           /* # HPreqs being served */
         cfs_duration_t   srv_rqbd_timeout;      /* timeout before re-posting reqs, in tick */
@@ -707,7 +723,7 @@ struct ptlrpc_service {
         /* AT stuff */
         struct adaptive_timeout srv_at_estimate;/* estimated rpc service time */
         spinlock_t        srv_at_lock;
-        struct list_head  srv_at_list;          /* reqs waiting for replies */
+        struct ptlrpc_at_array  srv_at_array;   /* reqs waiting for replies */
         cfs_timer_t       srv_at_timer;         /* early reply timer */
 
         int               srv_n_queued_reqs;    /* # reqs in either of the queues below */
@@ -731,8 +747,9 @@ struct ptlrpc_service {
 
         atomic_t          srv_outstanding_replies;
         struct list_head  srv_active_replies;   /* all the active replies */
+#ifndef __KERNEL__
         struct list_head  srv_reply_queue;      /* replies waiting for service */
-
+#endif
         cfs_waitq_t       srv_waitq; /* all threads sleep on this. This
                                       * wait-queue is signalled when new
                                       * incoming request arrives and when
@@ -871,16 +888,38 @@ extern lnet_pid_t ptl_get_pid(void);
 int ptlrpc_start_bulk_transfer(struct ptlrpc_bulk_desc *desc);
 void ptlrpc_abort_bulk(struct ptlrpc_bulk_desc *desc);
 int ptlrpc_register_bulk(struct ptlrpc_request *req);
-void ptlrpc_unregister_bulk (struct ptlrpc_request *req);
+int ptlrpc_unregister_bulk(struct ptlrpc_request *req, int async);
 
-static inline int ptlrpc_bulk_active (struct ptlrpc_bulk_desc *desc)
+static inline int ptlrpc_server_bulk_active(struct ptlrpc_bulk_desc *desc)
 {
-        int           rc;
+        int rc;
+
+        LASSERT(desc != NULL);
 
         spin_lock(&desc->bd_lock);
         rc = desc->bd_network_rw;
         spin_unlock(&desc->bd_lock);
-        return (rc);
+        return rc;
+}
+
+static inline int ptlrpc_client_bulk_active(struct ptlrpc_request *req)
+{
+        struct ptlrpc_bulk_desc *desc = req->rq_bulk;
+        int                      rc;
+
+        LASSERT(req != NULL);
+
+        if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_BULK_UNLINK) &&
+            req->rq_bulk_deadline > cfs_time_current_sec())
+                return 1;
+
+        if (!desc)
+                return 0;
+
+        spin_lock(&desc->bd_lock);
+        rc = desc->bd_network_rw;
+        spin_unlock(&desc->bd_lock);
+        return rc;
 }
 
 #define PTLRPC_REPLY_MAYBE_DIFFICULT 0x01
@@ -905,6 +944,7 @@ int ptlrpc_replay_req(struct ptlrpc_request *req);
 int ptlrpc_unregister_reply(struct ptlrpc_request *req, int async);
 void ptlrpc_restart_req(struct ptlrpc_request *req);
 void ptlrpc_abort_inflight(struct obd_import *imp);
+void ptlrpc_cleanup_imp(struct obd_import *imp);
 void ptlrpc_abort_set(struct ptlrpc_request_set *set);
 
 struct ptlrpc_request_set *ptlrpc_prep_set(void);
@@ -943,6 +983,11 @@ struct ptlrpc_request *ptlrpc_request_alloc_pack(struct obd_import *imp,
 int ptlrpc_request_bufs_pack(struct ptlrpc_request *request,
                              __u32 version, int opcode, char **bufs,
                              struct ptlrpc_cli_ctx *ctx);
+struct ptlrpc_request *ptlrpc_prep_fakereq(struct obd_import *imp,
+                                           unsigned int timeout,
+                                           ptlrpc_interpterer_t interpreter);
+void ptlrpc_fakereq_finished(struct ptlrpc_request *req);
+
 struct ptlrpc_request *ptlrpc_prep_req(struct obd_import *imp, __u32 version,
                                        int opcode, int count, __u32 *lengths,
                                        char **bufs);
@@ -982,7 +1027,8 @@ struct ptlrpc_service_conf {
 /* ptlrpc/service.c */
 void ptlrpc_save_lock (struct ptlrpc_request *req,
                        struct lustre_handle *lock, int mode, int no_ack);
-void ptlrpc_commit_replies (struct obd_device *obd);
+void ptlrpc_commit_replies(struct obd_export *exp);
+void ptlrpc_dispatch_difficult_reply (struct ptlrpc_reply_state *rs);
 void ptlrpc_schedule_difficult_reply (struct ptlrpc_reply_state *rs);
 struct ptlrpc_service *ptlrpc_init_svc_conf(struct ptlrpc_service_conf *c,
                                             svc_handler_t h, char *name,
@@ -1010,6 +1056,13 @@ void ptlrpc_daemonize(char *name);
 int ptlrpc_service_health_check(struct ptlrpc_service *);
 void ptlrpc_hpreq_reorder(struct ptlrpc_request *req);
 
+#ifdef __KERNEL__
+int ptlrpc_hr_init(void);
+void ptlrpc_hr_fini(void);
+#else
+# define ptlrpc_hr_init() (0)
+# define ptlrpc_hr_fini() do {} while(0)
+#endif
 
 struct ptlrpc_svc_data {
         char *name;
@@ -1075,6 +1128,7 @@ void lustre_msg_add_version(struct lustre_msg *msg, int version);
 __u32 lustre_msg_get_opc(struct lustre_msg *msg);
 __u64 lustre_msg_get_last_xid(struct lustre_msg *msg);
 __u64 lustre_msg_get_last_committed(struct lustre_msg *msg);
+__u64 *lustre_msg_get_versions(struct lustre_msg *msg);
 __u64 lustre_msg_get_transno(struct lustre_msg *msg);
 __u64 lustre_msg_get_slv(struct lustre_msg *msg);
 __u32 lustre_msg_get_limit(struct lustre_msg *msg);
@@ -1093,6 +1147,7 @@ void lustre_msg_set_type(struct lustre_msg *msg, __u32 type);
 void lustre_msg_set_opc(struct lustre_msg *msg, __u32 opc);
 void lustre_msg_set_last_xid(struct lustre_msg *msg, __u64 last_xid);
 void lustre_msg_set_last_committed(struct lustre_msg *msg,__u64 last_committed);
+void lustre_msg_set_versions(struct lustre_msg *msg, __u64 *versions);
 void lustre_msg_set_transno(struct lustre_msg *msg, __u64 transno);
 void lustre_msg_set_status(struct lustre_msg *msg, __u32 status);
 void lustre_msg_set_conn_cnt(struct lustre_msg *msg, __u32 conn_cnt);
@@ -1117,19 +1172,19 @@ ptlrpc_rqphase_move(struct ptlrpc_request *req, enum rq_phase new_phase)
 {
         if (req->rq_phase == new_phase)
                 return;
-        
+
         if (new_phase == RQ_PHASE_UNREGISTERING) {
                 req->rq_next_phase = req->rq_phase;
                 if (req->rq_import)
                         atomic_inc(&req->rq_import->imp_unregistering);
         }
-        
+
         if (req->rq_phase == RQ_PHASE_UNREGISTERING) {
                 if (req->rq_import)
                         atomic_dec(&req->rq_import->imp_unregistering);
         }
 
-        DEBUG_REQ(D_RPCTRACE, req, "move req \"%s\" -> \"%s\"", 
+        DEBUG_REQ(D_RPCTRACE, req, "move req \"%s\" -> \"%s\"",
                   ptlrpc_rqphase2str(req), ptlrpc_phase2str(new_phase));
 
         req->rq_phase = new_phase;
@@ -1138,7 +1193,7 @@ ptlrpc_rqphase_move(struct ptlrpc_request *req, enum rq_phase new_phase)
 static inline int
 ptlrpc_client_early(struct ptlrpc_request *req)
 {
-        if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_UNLINK) &&
+        if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_REPL_UNLINK) &&
             req->rq_reply_deadline > cfs_time_current_sec())
                 return 0;
         return req->rq_early;
@@ -1147,7 +1202,7 @@ ptlrpc_client_early(struct ptlrpc_request *req)
 static inline int
 ptlrpc_client_replied(struct ptlrpc_request *req)
 {
-        if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_UNLINK) &&
+        if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_REPL_UNLINK) &&
             req->rq_reply_deadline > cfs_time_current_sec())
                 return 0;
         return req->rq_replied;
@@ -1156,7 +1211,7 @@ ptlrpc_client_replied(struct ptlrpc_request *req)
 static inline int
 ptlrpc_client_recv(struct ptlrpc_request *req)
 {
-        if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_UNLINK) &&
+        if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_REPL_UNLINK) &&
             req->rq_reply_deadline > cfs_time_current_sec())
                 return 1;
         return req->rq_receiving_reply;
@@ -1168,7 +1223,7 @@ ptlrpc_client_recv_or_unlink(struct ptlrpc_request *req)
         int rc;
 
         spin_lock(&req->rq_lock);
-        if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_UNLINK) &&
+        if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_REPL_UNLINK) &&
             req->rq_reply_deadline > cfs_time_current_sec()) {
                 spin_unlock(&req->rq_lock);
                 return 1;
@@ -1233,7 +1288,7 @@ static inline int ptlrpc_req_get_repsize(struct ptlrpc_request *req)
 int client_obd_setup(struct obd_device *obddev, struct lustre_cfg *lcfg);
 int client_obd_cleanup(struct obd_device *obddev);
 int client_connect_import(const struct lu_env *env,
-                          struct lustre_handle *conn, struct obd_device *obd,
+                          struct obd_export **exp, struct obd_device *obd,
                           struct obd_uuid *cluuid, struct obd_connect_data *,
                           void *localdata);
 int client_disconnect_export(struct obd_export *exp);
@@ -1241,10 +1296,23 @@ int client_import_add_conn(struct obd_import *imp, struct obd_uuid *uuid,
                            int priority);
 int client_import_del_conn(struct obd_import *imp, struct obd_uuid *uuid);
 int import_set_conn_priority(struct obd_import *imp, struct obd_uuid *uuid);
+void client_destroy_import(struct obd_import *imp);
 
 /* ptlrpc/pinger.c */
+enum timeout_event {
+        TIMEOUT_GRANT = 1
+};
+struct timeout_item;
+typedef int (*timeout_cb_t)(struct timeout_item *, void *);
 int ptlrpc_pinger_add_import(struct obd_import *imp);
 int ptlrpc_pinger_del_import(struct obd_import *imp);
+int ptlrpc_add_timeout_client(int time, enum timeout_event event,
+                              timeout_cb_t cb, void *data,
+                              struct list_head *obd_list);
+int ptlrpc_del_timeout_client(struct list_head *obd_list,
+                              enum timeout_event event);
+struct ptlrpc_request * ptlrpc_prep_ping(struct obd_import *imp);
+int ptlrpc_obd_ping(struct obd_device *obd);
 cfs_time_t ptlrpc_suspend_wakeup_time(void);
 #ifdef __KERNEL__
 void ping_evictor_start(void);
@@ -1274,7 +1342,8 @@ enum ptlrpcd_scope {
 int ptlrpcd_start(const char *name, struct ptlrpcd_ctl *pc);
 void ptlrpcd_stop(struct ptlrpcd_ctl *pc, int force);
 void ptlrpcd_wake(struct ptlrpc_request *req);
-void ptlrpcd_add_req(struct ptlrpc_request *req, enum ptlrpcd_scope scope);
+int ptlrpcd_add_req(struct ptlrpc_request *req, enum ptlrpcd_scope scope);
+void ptlrpcd_add_rqset(struct ptlrpc_request_set *set);
 int ptlrpcd_addref(void);
 void ptlrpcd_decref(void);