Whamcloud - gitweb
Revert "LU-11771 ldlm: use hrtimer for recovery to fix timeout messages"
[fs/lustre-release.git] / lustre / ldlm / ldlm_lib.c
1 /*
2  * GPL HEADER START
3  *
4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 only,
8  * as published by the Free Software Foundation.
9  *
10  * This program is distributed in the hope that it will be useful, but
11  * WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13  * General Public License version 2 for more details (a copy is included
14  * in the LICENSE file that accompanied this code).
15  *
16  * You should have received a copy of the GNU General Public License
17  * version 2 along with this program; If not, see
18  * http://www.gnu.org/licenses/gpl-2.0.html
19  *
20  * GPL HEADER END
21  */
22 /*
23  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
24  * Use is subject to license terms.
25  *
26  * Copyright (c) 2010, 2017, Intel Corporation.
27  */
28 /*
29  * This file is part of Lustre, http://www.lustre.org/
30  * Lustre is a trademark of Sun Microsystems, Inc.
31  */
32
33 /**
34  * This file deals with various client/target related logic including recovery.
35  *
36  * TODO: This code more logically belongs in the ptlrpc module than in ldlm and
37  * should be moved.
38  */
39
40 #define DEBUG_SUBSYSTEM S_LDLM
41
42 #include <cl_object.h>
43 #include <linux/jiffies.h>
44 #include <linux/kthread.h>
45 #include <libcfs/libcfs.h>
46 #include <obd.h>
47 #include <obd_class.h>
48 #include <lustre_dlm.h>
49 #include <lustre_net.h>
50 #include <lustre_sec.h>
51 #include "ldlm_internal.h"
52
53 /* @priority: If non-zero, move the selected connection to the list head.
54  * @create: If zero, only search in existing connections.
55  */
56 static int import_set_conn(struct obd_import *imp, struct obd_uuid *uuid,
57                            int priority, int create)
58 {
59         struct ptlrpc_connection *ptlrpc_conn;
60         struct obd_import_conn *imp_conn = NULL, *item;
61         lnet_nid_t nid4refnet = LNET_NID_ANY;
62         int rc = 0;
63         ENTRY;
64
65         if (!create && !priority) {
66                 CDEBUG(D_HA, "Nothing to do\n");
67                 RETURN(-EINVAL);
68         }
69
70         if (imp->imp_connection &&
71             imp->imp_connection->c_remote_uuid.uuid[0] == 0)
72                 /* nid4refnet is used to restrict network connections */
73                 nid4refnet = imp->imp_connection->c_self;
74         ptlrpc_conn = ptlrpc_uuid_to_connection(uuid, nid4refnet);
75         if (!ptlrpc_conn) {
76                 CDEBUG(D_HA, "can't find connection %s\n", uuid->uuid);
77                 RETURN(-ENOENT);
78         }
79
80         if (create) {
81                 OBD_ALLOC(imp_conn, sizeof(*imp_conn));
82                 if (!imp_conn)
83                         GOTO(out_put, rc = -ENOMEM);
84         }
85
86         spin_lock(&imp->imp_lock);
87         list_for_each_entry(item, &imp->imp_conn_list, oic_item) {
88                 if (obd_uuid_equals(uuid, &item->oic_uuid)) {
89                         if (priority) {
90                                 list_del(&item->oic_item);
91                                 list_add(&item->oic_item,
92                                          &imp->imp_conn_list);
93                                 item->oic_last_attempt = 0;
94                         }
95                         CDEBUG(D_HA, "imp %p@%s: found existing conn %s%s\n",
96                                imp, imp->imp_obd->obd_name, uuid->uuid,
97                                (priority ? ", moved to head" : ""));
98                         spin_unlock(&imp->imp_lock);
99                         GOTO(out_free, rc = 0);
100                 }
101         }
102         /* No existing import connection found for \a uuid. */
103         if (create) {
104                 imp_conn->oic_conn = ptlrpc_conn;
105                 imp_conn->oic_uuid = *uuid;
106                 imp_conn->oic_last_attempt = 0;
107                 if (priority)
108                         list_add(&imp_conn->oic_item, &imp->imp_conn_list);
109                 else
110                         list_add_tail(&imp_conn->oic_item,
111                                       &imp->imp_conn_list);
112                 CDEBUG(D_HA, "imp %p@%s: add connection %s at %s\n",
113                        imp, imp->imp_obd->obd_name, uuid->uuid,
114                        (priority ? "head" : "tail"));
115         } else {
116                 spin_unlock(&imp->imp_lock);
117                 GOTO(out_free, rc = -ENOENT);
118         }
119
120         spin_unlock(&imp->imp_lock);
121         RETURN(0);
122 out_free:
123         if (imp_conn)
124                 OBD_FREE(imp_conn, sizeof(*imp_conn));
125 out_put:
126         ptlrpc_connection_put(ptlrpc_conn);
127         RETURN(rc);
128 }
129
130 int import_set_conn_priority(struct obd_import *imp, struct obd_uuid *uuid)
131 {
132         return import_set_conn(imp, uuid, 1, 0);
133 }
134
135 int client_import_add_conn(struct obd_import *imp, struct obd_uuid *uuid,
136                            int priority)
137 {
138         return import_set_conn(imp, uuid, priority, 1);
139 }
140 EXPORT_SYMBOL(client_import_add_conn);
141
142 int client_import_del_conn(struct obd_import *imp, struct obd_uuid *uuid)
143 {
144         struct obd_import_conn *imp_conn;
145         struct obd_export *dlmexp;
146         int rc = -ENOENT;
147         ENTRY;
148
149         spin_lock(&imp->imp_lock);
150         if (list_empty(&imp->imp_conn_list)) {
151                 LASSERT(!imp->imp_connection);
152                 GOTO(out, rc);
153         }
154
155         list_for_each_entry(imp_conn, &imp->imp_conn_list, oic_item) {
156                 if (!obd_uuid_equals(uuid, &imp_conn->oic_uuid))
157                         continue;
158                 LASSERT(imp_conn->oic_conn);
159
160                 if (imp_conn == imp->imp_conn_current) {
161                         LASSERT(imp_conn->oic_conn == imp->imp_connection);
162
163                         if (imp->imp_state != LUSTRE_IMP_CLOSED &&
164                             imp->imp_state != LUSTRE_IMP_DISCON) {
165                                 CERROR("can't remove current connection\n");
166                                 GOTO(out, rc = -EBUSY);
167                         }
168
169                         ptlrpc_connection_put(imp->imp_connection);
170                         imp->imp_connection = NULL;
171
172                         dlmexp = class_conn2export(&imp->imp_dlm_handle);
173                         if (dlmexp && dlmexp->exp_connection) {
174                                 LASSERT(dlmexp->exp_connection ==
175                                         imp_conn->oic_conn);
176                                 ptlrpc_connection_put(dlmexp->exp_connection);
177                                 dlmexp->exp_connection = NULL;
178                         }
179
180                         if (dlmexp != NULL)
181                                 class_export_put(dlmexp);
182                 }
183
184                 list_del(&imp_conn->oic_item);
185                 ptlrpc_connection_put(imp_conn->oic_conn);
186                 OBD_FREE(imp_conn, sizeof(*imp_conn));
187                 CDEBUG(D_HA, "imp %p@%s: remove connection %s\n",
188                        imp, imp->imp_obd->obd_name, uuid->uuid);
189                 rc = 0;
190                 break;
191         }
192 out:
193         spin_unlock(&imp->imp_lock);
194         if (rc == -ENOENT)
195                 CERROR("connection %s not found\n", uuid->uuid);
196         RETURN(rc);
197 }
198 EXPORT_SYMBOL(client_import_del_conn);
199
200 /**
201  * Find conn UUID by peer NID. \a peer is a server NID. This function is used
202  * to find a conn uuid of \a imp which can reach \a peer.
203  */
204 int client_import_find_conn(struct obd_import *imp, lnet_nid_t peer,
205                             struct obd_uuid *uuid)
206 {
207         struct obd_import_conn *conn;
208         int rc = -ENOENT;
209         ENTRY;
210
211         spin_lock(&imp->imp_lock);
212         list_for_each_entry(conn, &imp->imp_conn_list, oic_item) {
213                 /* Check if conn UUID does have this peer NID. */
214                 if (class_check_uuid(&conn->oic_uuid, peer)) {
215                         *uuid = conn->oic_uuid;
216                         rc = 0;
217                         break;
218                 }
219         }
220         spin_unlock(&imp->imp_lock);
221         RETURN(rc);
222 }
223 EXPORT_SYMBOL(client_import_find_conn);
224
225 void client_destroy_import(struct obd_import *imp)
226 {
227         /* Drop security policy instance after all RPCs have finished/aborted
228          * to let all busy contexts be released. */
229         class_import_get(imp);
230         class_destroy_import(imp);
231         sptlrpc_import_sec_put(imp);
232         class_import_put(imp);
233 }
234 EXPORT_SYMBOL(client_destroy_import);
235
236 /**
237  * Check whether or not the OSC is on MDT.
238  * In the config log,
239  * osc on MDT
240  *      setup 0:{fsname}-OSTxxxx-osc[-MDTxxxx] 1:lustre-OST0000_UUID 2:NID
241  * osc on client
242  *      setup 0:{fsname}-OSTxxxx-osc 1:lustre-OST0000_UUID 2:NID
243  *
244  **/
245 static int osc_on_mdt(char *obdname)
246 {
247         char *ptr;
248
249         ptr = strrchr(obdname, '-');
250         if (ptr == NULL)
251                 return 0;
252
253         if (strncmp(ptr + 1, "MDT", 3) == 0)
254                 return 1;
255
256         return 0;
257 }
258
259 /* Configure an RPC client OBD device.
260  *
261  * lcfg parameters:
262  * 1 - client UUID
263  * 2 - server UUID
264  * 3 - inactive-on-startup
265  * 4 - restrictive net
266  */
267 int client_obd_setup(struct obd_device *obddev, struct lustre_cfg *lcfg)
268 {
269         struct client_obd *cli = &obddev->u.cli;
270         struct obd_import *imp;
271         struct obd_uuid server_uuid;
272         int rq_portal, rp_portal, connect_op;
273         char *name = obddev->obd_type->typ_name;
274         enum ldlm_ns_type ns_type = LDLM_NS_TYPE_UNKNOWN;
275         char *cli_name = lustre_cfg_buf(lcfg, 0);
276         struct ptlrpc_connection fake_conn = { .c_self = 0,
277                                                .c_remote_uuid.uuid[0] = 0 };
278         int rc;
279         ENTRY;
280
281         /* In a more perfect world, we would hang a ptlrpc_client off of
282          * obd_type and just use the values from there. */
283         if (!strcmp(name, LUSTRE_OSC_NAME)) {
284                 rq_portal = OST_REQUEST_PORTAL;
285                 rp_portal = OSC_REPLY_PORTAL;
286                 connect_op = OST_CONNECT;
287                 cli->cl_sp_me = LUSTRE_SP_CLI;
288                 cli->cl_sp_to = LUSTRE_SP_OST;
289                 ns_type = LDLM_NS_TYPE_OSC;
290         } else if (!strcmp(name, LUSTRE_MDC_NAME) ||
291                    !strcmp(name, LUSTRE_LWP_NAME)) {
292                 rq_portal = MDS_REQUEST_PORTAL;
293                 rp_portal = MDC_REPLY_PORTAL;
294                 connect_op = MDS_CONNECT;
295                 if (is_lwp_on_ost(cli_name))
296                         cli->cl_sp_me = LUSTRE_SP_OST;
297                 else if (is_lwp_on_mdt(cli_name))
298                         cli->cl_sp_me = LUSTRE_SP_MDT;
299                 else
300                         cli->cl_sp_me = LUSTRE_SP_CLI;
301                 cli->cl_sp_to = LUSTRE_SP_MDT;
302                 ns_type = LDLM_NS_TYPE_MDC;
303         } else if (!strcmp(name, LUSTRE_OSP_NAME)) {
304                 if (strstr(lustre_cfg_buf(lcfg, 1), "OST") == NULL) {
305                         /* OSP_on_MDT for other MDTs */
306                         connect_op = MDS_CONNECT;
307                         cli->cl_sp_to = LUSTRE_SP_MDT;
308                         ns_type = LDLM_NS_TYPE_MDC;
309                         rq_portal = OUT_PORTAL;
310                 } else {
311                         /* OSP on MDT for OST */
312                         connect_op = OST_CONNECT;
313                         cli->cl_sp_to = LUSTRE_SP_OST;
314                         ns_type = LDLM_NS_TYPE_OSC;
315                         rq_portal = OST_REQUEST_PORTAL;
316                 }
317                 rp_portal = OSC_REPLY_PORTAL;
318                 cli->cl_sp_me = LUSTRE_SP_MDT;
319         } else if (!strcmp(name, LUSTRE_MGC_NAME)) {
320                 rq_portal = MGS_REQUEST_PORTAL;
321                 rp_portal = MGC_REPLY_PORTAL;
322                 connect_op = MGS_CONNECT;
323                 cli->cl_sp_me = LUSTRE_SP_MGC;
324                 cli->cl_sp_to = LUSTRE_SP_MGS;
325                 cli->cl_flvr_mgc.sf_rpc = SPTLRPC_FLVR_INVALID;
326                 ns_type = LDLM_NS_TYPE_MGC;
327         } else {
328                 CERROR("unknown client OBD type \"%s\", can't setup\n",
329                        name);
330                 RETURN(-EINVAL);
331         }
332
333         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
334                 CERROR("requires a TARGET UUID\n");
335                 RETURN(-EINVAL);
336         }
337
338         if (LUSTRE_CFG_BUFLEN(lcfg, 1) > 37) {
339                 CERROR("client UUID must be less than 38 characters\n");
340                 RETURN(-EINVAL);
341         }
342
343         if (LUSTRE_CFG_BUFLEN(lcfg, 2) < 1) {
344                 CERROR("setup requires a SERVER UUID\n");
345                 RETURN(-EINVAL);
346         }
347
348         if (LUSTRE_CFG_BUFLEN(lcfg, 2) > 37) {
349                 CERROR("target UUID must be less than 38 characters\n");
350                 RETURN(-EINVAL);
351         }
352
353         init_rwsem(&cli->cl_sem);
354         mutex_init(&cli->cl_mgc_mutex);
355         cli->cl_seq = NULL;
356         init_rwsem(&cli->cl_seq_rwsem);
357         cli->cl_conn_count = 0;
358         memcpy(server_uuid.uuid, lustre_cfg_buf(lcfg, 2),
359                min_t(unsigned int, LUSTRE_CFG_BUFLEN(lcfg, 2),
360                      sizeof(server_uuid)));
361
362         cli->cl_dirty_pages = 0;
363         cli->cl_dirty_max_pages = 0;
364         cli->cl_avail_grant = 0;
365         /* FIXME: Should limit this for the sum of all cl_dirty_max_pages. */
366         /* cl_dirty_max_pages may be changed at connect time in
367          * ptlrpc_connect_interpret(). */
368         client_adjust_max_dirty(cli);
369         INIT_LIST_HEAD(&cli->cl_cache_waiters);
370         INIT_LIST_HEAD(&cli->cl_loi_ready_list);
371         INIT_LIST_HEAD(&cli->cl_loi_hp_ready_list);
372         INIT_LIST_HEAD(&cli->cl_loi_write_list);
373         INIT_LIST_HEAD(&cli->cl_loi_read_list);
374         spin_lock_init(&cli->cl_loi_list_lock);
375         atomic_set(&cli->cl_pending_w_pages, 0);
376         atomic_set(&cli->cl_pending_r_pages, 0);
377         cli->cl_r_in_flight = 0;
378         cli->cl_w_in_flight = 0;
379
380         spin_lock_init(&cli->cl_read_rpc_hist.oh_lock);
381         spin_lock_init(&cli->cl_write_rpc_hist.oh_lock);
382         spin_lock_init(&cli->cl_read_page_hist.oh_lock);
383         spin_lock_init(&cli->cl_write_page_hist.oh_lock);
384         spin_lock_init(&cli->cl_read_offset_hist.oh_lock);
385         spin_lock_init(&cli->cl_write_offset_hist.oh_lock);
386
387         /* lru for osc. */
388         INIT_LIST_HEAD(&cli->cl_lru_osc);
389         atomic_set(&cli->cl_lru_shrinkers, 0);
390         atomic_long_set(&cli->cl_lru_busy, 0);
391         atomic_long_set(&cli->cl_lru_in_list, 0);
392         INIT_LIST_HEAD(&cli->cl_lru_list);
393         spin_lock_init(&cli->cl_lru_list_lock);
394         atomic_long_set(&cli->cl_unstable_count, 0);
395         INIT_LIST_HEAD(&cli->cl_shrink_list);
396         INIT_LIST_HEAD(&cli->cl_grant_chain);
397
398         INIT_LIST_HEAD(&cli->cl_flight_waiters);
399         cli->cl_rpcs_in_flight = 0;
400
401         init_waitqueue_head(&cli->cl_destroy_waitq);
402         atomic_set(&cli->cl_destroy_in_flight, 0);
403
404         cli->cl_supp_cksum_types = OBD_CKSUM_CRC32;
405 #ifdef ENABLE_CHECKSUM
406         /* Turn on checksumming by default. */
407         cli->cl_checksum = 1;
408         /*
409          * The supported checksum types will be worked out at connect time
410          * Set cl_chksum* to CRC32 for now to avoid returning screwed info
411          * through procfs.
412          */
413         cli->cl_cksum_type = cli->cl_supp_cksum_types;
414 #endif
415         atomic_set(&cli->cl_resends, OSC_DEFAULT_RESENDS);
416
417         /* Set it to possible maximum size. It may be reduced by ocd_brw_size
418          * from OFD after connecting. */
419         cli->cl_max_pages_per_rpc = PTLRPC_MAX_BRW_PAGES;
420
421         cli->cl_max_short_io_bytes = OBD_MAX_SHORT_IO_BYTES;
422
423         /* set cl_chunkbits default value to PAGE_SHIFT,
424          * it will be updated at OSC connection time. */
425         cli->cl_chunkbits = PAGE_SHIFT;
426
427         if (!strcmp(name, LUSTRE_MDC_NAME)) {
428                 cli->cl_max_rpcs_in_flight = OBD_MAX_RIF_DEFAULT;
429         } else if (totalram_pages >> (20 - PAGE_SHIFT) <= 128 /* MB */) {
430                 cli->cl_max_rpcs_in_flight = 2;
431         } else if (totalram_pages >> (20 - PAGE_SHIFT) <= 256 /* MB */) {
432                 cli->cl_max_rpcs_in_flight = 3;
433         } else if (totalram_pages >> (20 - PAGE_SHIFT) <= 512 /* MB */) {
434                 cli->cl_max_rpcs_in_flight = 4;
435         } else {
436                 if (osc_on_mdt(obddev->obd_name))
437                         cli->cl_max_rpcs_in_flight = OBD_MAX_RIF_MAX;
438                 else
439                         cli->cl_max_rpcs_in_flight = OBD_MAX_RIF_DEFAULT;
440         }
441
442         spin_lock_init(&cli->cl_mod_rpcs_lock);
443         spin_lock_init(&cli->cl_mod_rpcs_hist.oh_lock);
444         cli->cl_max_mod_rpcs_in_flight = 0;
445         cli->cl_mod_rpcs_in_flight = 0;
446         cli->cl_close_rpcs_in_flight = 0;
447         init_waitqueue_head(&cli->cl_mod_rpcs_waitq);
448         cli->cl_mod_tag_bitmap = NULL;
449
450         INIT_LIST_HEAD(&cli->cl_chg_dev_linkage);
451
452         if (connect_op == MDS_CONNECT) {
453                 cli->cl_max_mod_rpcs_in_flight = cli->cl_max_rpcs_in_flight - 1;
454                 OBD_ALLOC(cli->cl_mod_tag_bitmap,
455                           BITS_TO_LONGS(OBD_MAX_RIF_MAX) * sizeof(long));
456                 if (cli->cl_mod_tag_bitmap == NULL)
457                         GOTO(err, rc = -ENOMEM);
458         }
459
460         rc = ldlm_get_ref();
461         if (rc) {
462                 CERROR("ldlm_get_ref failed: %d\n", rc);
463                 GOTO(err, rc);
464         }
465
466         ptlrpc_init_client(rq_portal, rp_portal, name,
467                            &obddev->obd_ldlm_client);
468
469         imp = class_new_import(obddev);
470         if (imp == NULL)
471                 GOTO(err_ldlm, rc = -ENOENT);
472         imp->imp_client = &obddev->obd_ldlm_client;
473         imp->imp_connect_op = connect_op;
474         memcpy(cli->cl_target_uuid.uuid, lustre_cfg_buf(lcfg, 1),
475                LUSTRE_CFG_BUFLEN(lcfg, 1));
476         class_import_put(imp);
477
478         if (lustre_cfg_buf(lcfg, 4)) {
479                 __u32 refnet = libcfs_str2net(lustre_cfg_string(lcfg, 4));
480
481                 if (refnet == LNET_NIDNET(LNET_NID_ANY)) {
482                         rc = -EINVAL;
483                         CERROR("%s: bad mount option 'network=%s': rc = %d\n",
484                                obddev->obd_name, lustre_cfg_string(lcfg, 4),
485                                rc);
486                         GOTO(err_import, rc);
487                 }
488                 fake_conn.c_self = LNET_MKNID(refnet, 0);
489                 imp->imp_connection = &fake_conn;
490         }
491
492         rc = client_import_add_conn(imp, &server_uuid, 1);
493         if (rc) {
494                 CERROR("can't add initial connection\n");
495                 GOTO(err_import, rc);
496         }
497         imp->imp_connection = NULL;
498
499         cli->cl_import = imp;
500         /* cli->cl_max_mds_easize updated by mdc_init_ea_size() */
501         cli->cl_max_mds_easize = sizeof(struct lov_mds_md_v3);
502
503         if (LUSTRE_CFG_BUFLEN(lcfg, 3) > 0) {
504                 if (!strcmp(lustre_cfg_string(lcfg, 3), "inactive")) {
505                         CDEBUG(D_HA, "marking %s %s->%s as inactive\n",
506                                name, obddev->obd_name,
507                                cli->cl_target_uuid.uuid);
508                         spin_lock(&imp->imp_lock);
509                         imp->imp_deactive = 1;
510                         spin_unlock(&imp->imp_lock);
511                 }
512         }
513
514         obddev->obd_namespace = ldlm_namespace_new(obddev, obddev->obd_name,
515                                                    LDLM_NAMESPACE_CLIENT,
516                                                    LDLM_NAMESPACE_GREEDY,
517                                                    ns_type);
518         if (obddev->obd_namespace == NULL) {
519                 CERROR("Unable to create client namespace - %s\n",
520                        obddev->obd_name);
521                 GOTO(err_import, rc = -ENOMEM);
522         }
523
524         RETURN(rc);
525
526 err_import:
527         class_destroy_import(imp);
528 err_ldlm:
529         ldlm_put_ref();
530 err:
531         if (cli->cl_mod_tag_bitmap != NULL)
532                 OBD_FREE(cli->cl_mod_tag_bitmap,
533                          BITS_TO_LONGS(OBD_MAX_RIF_MAX) * sizeof(long));
534         cli->cl_mod_tag_bitmap = NULL;
535         RETURN(rc);
536
537 }
538 EXPORT_SYMBOL(client_obd_setup);
539
540 int client_obd_cleanup(struct obd_device *obddev)
541 {
542         struct client_obd *cli = &obddev->u.cli;
543         ENTRY;
544
545         ldlm_namespace_free_post(obddev->obd_namespace);
546         obddev->obd_namespace = NULL;
547
548         obd_cleanup_client_import(obddev);
549         LASSERT(obddev->u.cli.cl_import == NULL);
550
551         ldlm_put_ref();
552
553         if (cli->cl_mod_tag_bitmap != NULL)
554                 OBD_FREE(cli->cl_mod_tag_bitmap,
555                          BITS_TO_LONGS(OBD_MAX_RIF_MAX) * sizeof(long));
556         cli->cl_mod_tag_bitmap = NULL;
557
558         RETURN(0);
559 }
560 EXPORT_SYMBOL(client_obd_cleanup);
561
562 /* ->o_connect() method for client side (OSC and MDC and MGC) */
563 int client_connect_import(const struct lu_env *env,
564                           struct obd_export **exp,
565                           struct obd_device *obd, struct obd_uuid *cluuid,
566                           struct obd_connect_data *data, void *localdata)
567 {
568         struct client_obd       *cli    = &obd->u.cli;
569         struct obd_import       *imp    = cli->cl_import;
570         struct obd_connect_data *ocd;
571         struct lustre_handle    conn    = { 0 };
572         int                     rc;
573         ENTRY;
574
575         *exp = NULL;
576         down_write(&cli->cl_sem);
577         if (cli->cl_conn_count > 0)
578                 GOTO(out_sem, rc = -EALREADY);
579
580         rc = class_connect(&conn, obd, cluuid);
581         if (rc)
582                 GOTO(out_sem, rc);
583
584         cli->cl_conn_count++;
585         *exp = class_conn2export(&conn);
586
587         LASSERT(obd->obd_namespace);
588
589         imp->imp_dlm_handle = conn;
590         rc = ptlrpc_init_import(imp);
591         if (rc != 0)
592                 GOTO(out_ldlm, rc);
593
594         ocd = &imp->imp_connect_data;
595         if (data) {
596                 *ocd = *data;
597                 imp->imp_connect_flags_orig = data->ocd_connect_flags;
598                 imp->imp_connect_flags2_orig = data->ocd_connect_flags2;
599         }
600
601         rc = ptlrpc_connect_import(imp);
602         if (rc != 0) {
603                 LASSERT(imp->imp_state == LUSTRE_IMP_DISCON);
604                 GOTO(out_ldlm, rc);
605         }
606         LASSERT(*exp != NULL && (*exp)->exp_connection);
607
608         if (data) {
609                 LASSERTF((ocd->ocd_connect_flags & data->ocd_connect_flags) ==
610                          ocd->ocd_connect_flags, "old %#llx, new %#llx\n",
611                          data->ocd_connect_flags, ocd->ocd_connect_flags);
612                 data->ocd_connect_flags = ocd->ocd_connect_flags;
613                 data->ocd_connect_flags2 = ocd->ocd_connect_flags2;
614         }
615
616         ptlrpc_pinger_add_import(imp);
617
618         EXIT;
619
620         if (rc) {
621 out_ldlm:
622                 cli->cl_conn_count--;
623                 class_disconnect(*exp);
624                 *exp = NULL;
625         }
626 out_sem:
627         up_write(&cli->cl_sem);
628
629         if (!rc && localdata) {
630                 LASSERT(cli->cl_cache == NULL); /* only once */
631                 cli->cl_cache = (struct cl_client_cache *)localdata;
632                 cl_cache_incref(cli->cl_cache);
633                 cli->cl_lru_left = &cli->cl_cache->ccc_lru_left;
634
635                 /* add this osc into entity list */
636                 LASSERT(list_empty(&cli->cl_lru_osc));
637                 spin_lock(&cli->cl_cache->ccc_lru_lock);
638                 list_add(&cli->cl_lru_osc, &cli->cl_cache->ccc_lru);
639                 spin_unlock(&cli->cl_cache->ccc_lru_lock);
640         }
641
642         return rc;
643 }
644 EXPORT_SYMBOL(client_connect_import);
645
646 int client_disconnect_export(struct obd_export *exp)
647 {
648         struct obd_device *obd = class_exp2obd(exp);
649         struct client_obd *cli;
650         struct obd_import *imp;
651         int rc = 0, err;
652         ENTRY;
653
654         if (!obd) {
655                 CERROR("invalid export for disconnect: exp %p cookie %#llx\n",
656                        exp, exp ? exp->exp_handle.h_cookie : -1);
657                 RETURN(-EINVAL);
658         }
659
660         cli = &obd->u.cli;
661         imp = cli->cl_import;
662
663         down_write(&cli->cl_sem);
664         CDEBUG(D_INFO, "disconnect %s - %zu\n", obd->obd_name,
665                 cli->cl_conn_count);
666
667         if (cli->cl_conn_count == 0) {
668                 CERROR("disconnecting disconnected device (%s)\n",
669                        obd->obd_name);
670                 GOTO(out_disconnect, rc = -EINVAL);
671         }
672
673         cli->cl_conn_count--;
674         if (cli->cl_conn_count != 0)
675                 GOTO(out_disconnect, rc = 0);
676
677         /* Mark import deactivated now, so we don't try to reconnect if any
678          * of the cleanup RPCs fails (e.g. LDLM cancel, etc).  We don't
679          * fully deactivate the import, or that would drop all requests. */
680         spin_lock(&imp->imp_lock);
681         imp->imp_deactive = 1;
682         spin_unlock(&imp->imp_lock);
683
684         /* Some non-replayable imports (MDS's OSCs) are pinged, so just
685          * delete it regardless.  (It's safe to delete an import that was
686          * never added.) */
687         (void)ptlrpc_pinger_del_import(imp);
688
689         if (obd->obd_namespace != NULL) {
690                 /* obd_force == local only */
691                 ldlm_cli_cancel_unused(obd->obd_namespace, NULL,
692                                        obd->obd_force ? LCF_LOCAL : 0, NULL);
693                 ldlm_namespace_free_prior(obd->obd_namespace, imp, obd->obd_force);
694         }
695
696         /* There's no need to hold sem while disconnecting an import,
697          * and it may actually cause deadlock in GSS. */
698         up_write(&cli->cl_sem);
699         rc = ptlrpc_disconnect_import(imp, 0);
700         down_write(&cli->cl_sem);
701
702         ptlrpc_invalidate_import(imp);
703
704         EXIT;
705
706 out_disconnect:
707         /* Use server style - class_disconnect should be always called for
708          * o_disconnect. */
709         err = class_disconnect(exp);
710         if (!rc && err)
711                 rc = err;
712
713         up_write(&cli->cl_sem);
714
715         RETURN(rc);
716 }
717 EXPORT_SYMBOL(client_disconnect_export);
718
719 #ifdef HAVE_SERVER_SUPPORT
720 int server_disconnect_export(struct obd_export *exp)
721 {
722         int rc;
723         ENTRY;
724
725         /* Disconnect early so that clients can't keep using export. */
726         rc = class_disconnect(exp);
727         /* Close import to avoid sending any requests. */
728         if (exp->exp_imp_reverse)
729                 ptlrpc_cleanup_imp(exp->exp_imp_reverse);
730
731         ldlm_bl_thread_wakeup();
732
733         /* complete all outstanding replies */
734         spin_lock(&exp->exp_lock);
735         while (!list_empty(&exp->exp_outstanding_replies)) {
736                 struct ptlrpc_reply_state *rs =
737                         list_entry(exp->exp_outstanding_replies.next,
738                                        struct ptlrpc_reply_state, rs_exp_list);
739                 struct ptlrpc_service_part *svcpt = rs->rs_svcpt;
740
741                 spin_lock(&svcpt->scp_rep_lock);
742
743                 list_del_init(&rs->rs_exp_list);
744
745                 spin_lock(&rs->rs_lock);
746                 /* clear rs_convert_lock to make sure rs is handled and put */
747                 rs->rs_convert_lock = 0;
748                 ptlrpc_schedule_difficult_reply(rs);
749                 spin_unlock(&rs->rs_lock);
750
751                 spin_unlock(&svcpt->scp_rep_lock);
752         }
753         spin_unlock(&exp->exp_lock);
754
755         RETURN(rc);
756 }
757 EXPORT_SYMBOL(server_disconnect_export);
758
759 /* --------------------------------------------------------------------------
760  * from old lib/target.c
761  * -------------------------------------------------------------------------- */
762
763 static int target_handle_reconnect(struct lustre_handle *conn,
764                                    struct obd_export *exp,
765                                    struct obd_uuid *cluuid)
766 {
767         struct obd_device *target;
768         struct lustre_handle *hdl;
769         time64_t deadline;
770         time64_t timeout;
771         time64_t now;
772         int rc = 0;
773
774         ENTRY;
775         hdl = &exp->exp_imp_reverse->imp_remote_handle;
776         if (!exp->exp_connection || !lustre_handle_is_used(hdl)) {
777                 conn->cookie = exp->exp_handle.h_cookie;
778                 CDEBUG(D_HA, "connect export for UUID '%s' at %p,"
779                        " cookie %#llx\n", cluuid->uuid, exp, conn->cookie);
780                 RETURN(0);
781         }
782
783         target = exp->exp_obd;
784
785         /* Might be a re-connect after a partition. */
786         if (memcmp(&conn->cookie, &hdl->cookie, sizeof conn->cookie)) {
787                 LCONSOLE_WARN("%s: already connected client %s (at %s) "
788                               "with handle %#llx. Rejecting client "
789                               "with the same UUID trying to reconnect "
790                               "with handle %#llx\n", target->obd_name,
791                               obd_uuid2str(&exp->exp_client_uuid),
792                               obd_export_nid2str(exp),
793                               hdl->cookie, conn->cookie);
794                 memset(conn, 0, sizeof *conn);
795                 /* target_handle_connect() treats EALREADY and
796                  * -EALREADY differently.  -EALREADY is an error
797                  * (same UUID, different handle). */
798                 RETURN(-EALREADY);
799         }
800
801         if (!target->obd_recovering) {
802                 LCONSOLE_WARN("%s: Client %s (at %s) reconnecting\n",
803                         target->obd_name, obd_uuid2str(&exp->exp_client_uuid),
804                         obd_export_nid2str(exp));
805                 GOTO(out_already, rc);
806         }
807
808         now = ktime_get_seconds();
809         deadline = jiffies_to_msecs(target->obd_recovery_timer.expires) /
810                    MSEC_PER_SEC;
811         if (now < deadline) {
812                 struct target_distribute_txn_data *tdtd;
813                 int size = 0;
814                 int count = 0;
815                 char *buf = NULL;
816
817                 timeout = deadline - now;
818                 tdtd = class_exp2tgt(exp)->lut_tdtd;
819                 if (tdtd && tdtd->tdtd_show_update_logs_retrievers)
820                         buf = tdtd->tdtd_show_update_logs_retrievers(
821                                 tdtd->tdtd_show_retrievers_cbdata,
822                                 &size, &count);
823
824                 if (count > 0)
825                         LCONSOLE_WARN("%s: Recovery already passed deadline "
826                                       "%lld:%.02lld. It is due to DNE recovery "
827                                       "failed/stuck on the %d MDT(s):%s. "
828                                       "Please wait until all MDTs recovered "
829                                       "or abort the recovery by force.\n",
830                                       target->obd_name, timeout / 60,
831                                       timeout % 60, count,
832                                       buf ? buf : "unknown (not enough RAM)");
833                 else
834                         LCONSOLE_WARN("%s: Recovery already passed deadline "
835                                       "%lld:%.02lld. If you do not want to wait "
836                                       "more, please abort the recovery by "
837                                       "force.\n", target->obd_name,
838                                       timeout / 60, timeout % 60);
839
840                 if (buf != NULL)
841                         OBD_FREE(buf, size);
842         } else {
843                 timeout = now - deadline;
844                 LCONSOLE_WARN("%s: Recovery already passed deadline"
845                         " %lld:%.02lld, It is most likely due to DNE"
846                         " recovery is failed or stuck, please wait a"
847                         " few more minutes or abort the recovery.\n",
848                         target->obd_name, timeout / 60, timeout % 60);
849         }
850
851 out_already:
852         conn->cookie = exp->exp_handle.h_cookie;
853         /* target_handle_connect() treats EALREADY and
854          * -EALREADY differently.  EALREADY means we are
855          * doing a valid reconnect from the same client. */
856         RETURN(EALREADY);
857 }
858
859 static void
860 check_and_start_recovery_timer(struct obd_device *obd,
861                                struct ptlrpc_request *req, int new_client);
862
863 /**
864  * update flags for import during reconnect process
865  */
866 static int rev_import_flags_update(struct obd_import *revimp,
867                                    struct ptlrpc_request *req)
868 {
869         int rc;
870         struct obd_connect_data *data;
871
872         data = req_capsule_client_get(&req->rq_pill, &RMF_CONNECT_DATA);
873
874         if (data->ocd_connect_flags & OBD_CONNECT_AT)
875                 revimp->imp_msghdr_flags |= MSGHDR_AT_SUPPORT;
876         else
877                 revimp->imp_msghdr_flags &= ~MSGHDR_AT_SUPPORT;
878
879         revimp->imp_msghdr_flags |= MSGHDR_CKSUM_INCOMPAT18;
880
881         rc = sptlrpc_import_sec_adapt(revimp, req->rq_svc_ctx, &req->rq_flvr);
882         if (rc) {
883                 CERROR("%s: cannot get reverse import %s security: rc = %d\n",
884                         revimp->imp_client->cli_name,
885                         libcfs_id2str(req->rq_peer), rc);
886                 return rc;
887         }
888
889         return 0;
890 }
891
892 /**
893  * Allocate a new reverse import for an export.
894  *
895  * \retval -errno in case error hit
896  * \retval 0 if reverse import correctly init
897  **/
898 int rev_import_init(struct obd_export *export)
899 {
900         struct obd_device *obd = export->exp_obd;
901         struct obd_import *revimp;
902
903         LASSERT(export->exp_imp_reverse == NULL);
904
905         revimp = class_new_import(obd);
906         if (revimp == NULL)
907                 return -ENOMEM;
908
909         revimp->imp_remote_handle.cookie = 0ULL;
910         revimp->imp_client = &obd->obd_ldlm_client;
911         revimp->imp_dlm_fake = 1;
912
913         /* it is safe to connect import in new state as no sends possible */
914         spin_lock(&export->exp_lock);
915         export->exp_imp_reverse = revimp;
916         spin_unlock(&export->exp_lock);
917         class_import_put(revimp);
918
919         return 0;
920 }
921 EXPORT_SYMBOL(rev_import_init);
922
923 /**
924  * Handle reconnect for an export.
925  *
926  * \param exp export to handle reconnect process
927  * \param req client reconnect request
928  *
929  * \retval -rc in case securitfy flavor can't be changed
930  * \retval 0 in case none problems
931  */
932 static int rev_import_reconnect(struct obd_export *exp,
933                                 struct ptlrpc_request *req)
934 {
935         struct obd_import *revimp = exp->exp_imp_reverse;
936         struct lustre_handle *lh;
937         int rc;
938
939         /* avoid sending a request until import flags are changed */
940         ptlrpc_import_enter_resend(revimp);
941
942         if (revimp->imp_connection != NULL)
943                 ptlrpc_connection_put(revimp->imp_connection);
944
945         /*
946          * client from recovery don't have a handle so we need to take from
947          * request. it may produce situation when wrong client connected
948          * to recovery as we trust a client uuid
949          */
950         lh = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
951         revimp->imp_remote_handle = *lh;
952
953         /* unknown versions will be caught in
954          * ptlrpc_handle_server_req_in->lustre_unpack_msg() */
955         revimp->imp_msg_magic = req->rq_reqmsg->lm_magic;
956
957         revimp->imp_connection = ptlrpc_connection_addref(exp->exp_connection);
958
959         rc = rev_import_flags_update(revimp, req);
960         if (rc != 0) {
961                 /* it is safe to still be in RECOVERY phase as we are not able
962                  * to setup correct security flavor so requests are not able to
963                  * be delivered correctly */
964                 return rc;
965         }
966
967         /* resend all rpc's via new connection */
968         return ptlrpc_import_recovery_state_machine(revimp);
969 }
970
971 int target_handle_connect(struct ptlrpc_request *req)
972 {
973         struct obd_device *target = NULL;
974         struct obd_export *export = NULL;
975         /* connect handle - filled from target_handle_reconnect in
976          * reconnect case */
977         struct lustre_handle conn;
978         struct lustre_handle *tmp;
979         struct obd_uuid cluuid;
980         char *str;
981         int rc = 0;
982         char *target_start;
983         int target_len;
984         bool     mds_conn = false, lw_client = false, initial_conn = false;
985         bool     mds_mds_conn = false;
986         bool     new_mds_mds_conn = false;
987         struct obd_connect_data *data, *tmpdata;
988         int size, tmpsize;
989         lnet_nid_t *client_nid = NULL;
990         ENTRY;
991
992         OBD_RACE(OBD_FAIL_TGT_CONN_RACE);
993
994         str = req_capsule_client_get(&req->rq_pill, &RMF_TGTUUID);
995         if (str == NULL) {
996                 DEBUG_REQ(D_ERROR, req, "bad target UUID for connect");
997                 GOTO(out, rc = -EINVAL);
998         }
999
1000         target = class_dev_by_str(str);
1001         if (!target) {
1002                 deuuidify(str, NULL, &target_start, &target_len);
1003                 LCONSOLE_ERROR_MSG(0x137, "%s: not available for connect "
1004                                    "from %s (no target). If you are running "
1005                                    "an HA pair check that the target is "
1006                                    "mounted on the other server.\n", str,
1007                                    libcfs_nid2str(req->rq_peer.nid));
1008                 GOTO(out, rc = -ENODEV);
1009         }
1010
1011         spin_lock(&target->obd_dev_lock);
1012
1013         target->obd_conn_inprogress++;
1014
1015         if (target->obd_stopping || !target->obd_set_up) {
1016                 spin_unlock(&target->obd_dev_lock);
1017
1018                 deuuidify(str, NULL, &target_start, &target_len);
1019                 LCONSOLE_INFO("%.*s: Not available for connect from %s (%s)\n",
1020                               target_len, target_start,
1021                               libcfs_nid2str(req->rq_peer.nid),
1022                               (target->obd_stopping ?
1023                                "stopping" : "not set up"));
1024                 GOTO(out, rc = -ENODEV);
1025         }
1026
1027         if (target->obd_no_conn) {
1028                 spin_unlock(&target->obd_dev_lock);
1029
1030                 CDEBUG(D_INFO, "%s: Temporarily refusing client connection "
1031                                "from %s\n", target->obd_name,
1032                                libcfs_nid2str(req->rq_peer.nid));
1033                 GOTO(out, rc = -EAGAIN);
1034         }
1035
1036         spin_unlock(&target->obd_dev_lock);
1037
1038         str = req_capsule_client_get(&req->rq_pill, &RMF_CLUUID);
1039         if (str == NULL) {
1040                 DEBUG_REQ(D_ERROR, req, "bad client UUID for connect");
1041                 GOTO(out, rc = -EINVAL);
1042         }
1043
1044         obd_str2uuid(&cluuid, str);
1045
1046         tmp = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
1047         if (tmp == NULL)
1048                 GOTO(out, rc = -EPROTO);
1049
1050         conn = *tmp;
1051
1052         size = req_capsule_get_size(&req->rq_pill, &RMF_CONNECT_DATA,
1053                                     RCL_CLIENT);
1054         data = req_capsule_client_get(&req->rq_pill, &RMF_CONNECT_DATA);
1055         if (!data)
1056                 GOTO(out, rc = -EPROTO);
1057
1058         rc = req_capsule_server_pack(&req->rq_pill);
1059         if (rc)
1060                 GOTO(out, rc);
1061
1062 #if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(3, 0, 53, 0)
1063         /* Don't allow clients to connect that are using old 1.8 format
1064          * protocol conventions (LUSTRE_MSG_MAGIC_v1, !MSGHDR_CKSUM_INCOMPAT18,
1065          * ldlm_flock_policy_wire format, MDT_ATTR_xTIME_SET, etc).  The
1066          * FULL20 flag should be set on all connections since 2.0, but no
1067          * longer affects behaviour.
1068          *
1069          * Later this check will be disabled and the flag can be retired
1070          * completely once interop with 3.0 is no longer needed.
1071          */
1072         if (!(data->ocd_connect_flags & OBD_CONNECT_FULL20))
1073                 GOTO(out, rc = -EPROTO);
1074
1075         /* Don't allow liblustre clients to connect.
1076          * - testing was disabled in v2_2_50_0-61-g6a75d65
1077          * - building was disabled in v2_5_58_0-28-g7277179
1078          * - client code was deleted in v2_6_50_0-101-gcdfbc72,
1079          * - clients were refused connect for version difference > 0.0.1.32  */
1080         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
1081                 DEBUG_REQ(D_WARNING, req, "Refusing libclient connection");
1082                 GOTO(out, rc = -EPROTO);
1083         }
1084 #endif
1085
1086         /* Note: lw_client is needed in MDS-MDS failover during update log
1087          * processing, so we needs to allow lw_client to be connected at
1088          * anytime, instead of only the initial connection */
1089         lw_client = (data->ocd_connect_flags & OBD_CONNECT_LIGHTWEIGHT) != 0;
1090
1091         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_INITIAL) {
1092                 initial_conn = true;
1093                 mds_conn = (data->ocd_connect_flags & OBD_CONNECT_MDS) != 0;
1094                 mds_mds_conn = (data->ocd_connect_flags &
1095                                 OBD_CONNECT_MDS_MDS) != 0;
1096
1097                 /* OBD_CONNECT_MNE_SWAB is defined as OBD_CONNECT_MDS_MDS
1098                  * for Imperative Recovery connection from MGC to MGS.
1099                  *
1100                  * Via check OBD_CONNECT_FID, we can distinguish whether
1101                  * the OBD_CONNECT_MDS_MDS/OBD_CONNECT_MNE_SWAB is from
1102                  * MGC or MDT, since MGC does not use OBD_CONNECT_FID.
1103                  */
1104                 if (!lw_client &&
1105                     (data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) &&
1106                     (data->ocd_connect_flags & OBD_CONNECT_FID) &&
1107                     (data->ocd_connect_flags & OBD_CONNECT_VERSION)) {
1108                         __u32 major = OBD_OCD_VERSION_MAJOR(data->ocd_version);
1109                         __u32 minor = OBD_OCD_VERSION_MINOR(data->ocd_version);
1110                         __u32 patch = OBD_OCD_VERSION_PATCH(data->ocd_version);
1111
1112                         /* We do not support the MDT-MDT interoperations with
1113                          * different version MDT because of protocol changes. */
1114                         if (unlikely(major != LUSTRE_MAJOR ||
1115                                      minor != LUSTRE_MINOR ||
1116                                      abs(patch - LUSTRE_PATCH) > 3)) {
1117                                 LCONSOLE_WARN("%s (%u.%u.%u.%u) refused the "
1118                                         "connection from different version MDT "
1119                                         "(%d.%d.%d.%d) %s %s\n",
1120                                         target->obd_name, LUSTRE_MAJOR,
1121                                         LUSTRE_MINOR, LUSTRE_PATCH, LUSTRE_FIX,
1122                                         major, minor, patch,
1123                                         OBD_OCD_VERSION_FIX(data->ocd_version),
1124                                         libcfs_nid2str(req->rq_peer.nid), str);
1125
1126                                 GOTO(out, rc = -EPROTO);
1127                         }
1128                 }
1129         }
1130
1131         /* lctl gets a backstage, all-access pass. */
1132         if (obd_uuid_equals(&cluuid, &target->obd_uuid))
1133                 goto dont_check_exports;
1134
1135         export = cfs_hash_lookup(target->obd_uuid_hash, &cluuid);
1136         if (!export)
1137                 goto no_export;
1138
1139         /* We've found an export in the hash. */
1140
1141         spin_lock(&export->exp_lock);
1142
1143         if (export->exp_connecting) { /* bug 9635, et. al. */
1144                 spin_unlock(&export->exp_lock);
1145                 LCONSOLE_WARN("%s: Export %p already connecting from %s\n",
1146                               export->exp_obd->obd_name, export,
1147                               libcfs_nid2str(req->rq_peer.nid));
1148                 class_export_put(export);
1149                 export = NULL;
1150                 rc = -EALREADY;
1151         } else if ((mds_conn || (lw_client && initial_conn) ||
1152                    data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) &&
1153                    export->exp_connection != NULL) {
1154                 spin_unlock(&export->exp_lock);
1155                 if (req->rq_peer.nid != export->exp_connection->c_peer.nid) {
1156                         /* MDS or LWP reconnected after failover. */
1157                         LCONSOLE_WARN("%s: Received %s connection from "
1158                             "%s, removing former export from %s\n",
1159                             target->obd_name, mds_conn ? "MDS" : "LWP",
1160                             libcfs_nid2str(req->rq_peer.nid),
1161                             libcfs_nid2str(export->exp_connection->c_peer.nid));
1162                 } else {
1163                         /* New MDS connection from the same NID. */
1164                         LCONSOLE_WARN("%s: Received new %s connection from "
1165                                 "%s, removing former export from same NID\n",
1166                                 target->obd_name, mds_conn ? "MDS" : "LWP",
1167                                 libcfs_nid2str(req->rq_peer.nid));
1168                 }
1169
1170                 if (req->rq_peer.nid == export->exp_connection->c_peer.nid &&
1171                     data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) {
1172                         /* Because exports between MDTs will always be
1173                          * kept, let's do not fail such export if they
1174                          * come from the same NID, otherwise it might
1175                          * cause eviction between MDTs, which might
1176                          * cause namespace inconsistency */
1177                         spin_lock(&export->exp_lock);
1178                         export->exp_connecting = 1;
1179                         export->exp_conn_cnt = 0;
1180                         spin_unlock(&export->exp_lock);
1181                         conn.cookie = export->exp_handle.h_cookie;
1182                         rc = EALREADY;
1183                 } else {
1184                         class_fail_export(export);
1185                         class_export_put(export);
1186                         export = NULL;
1187                         rc = 0;
1188                 }
1189         } else if (export->exp_connection != NULL && initial_conn &&
1190                    req->rq_peer.nid != export->exp_connection->c_peer.nid) {
1191                 spin_unlock(&export->exp_lock);
1192                 /* In MDS failover we have static UUID but NID can change. */
1193                 LCONSOLE_WARN("%s: Client %s seen on new nid %s when "
1194                               "existing nid %s is already connected\n",
1195                               target->obd_name, cluuid.uuid,
1196                               libcfs_nid2str(req->rq_peer.nid),
1197                               libcfs_nid2str(
1198                                       export->exp_connection->c_peer.nid));
1199                 rc = -EALREADY;
1200                 class_export_put(export);
1201                 export = NULL;
1202         } else {
1203                 export->exp_connecting = 1;
1204                 spin_unlock(&export->exp_lock);
1205                 LASSERT(export->exp_obd == target);
1206
1207                 rc = target_handle_reconnect(&conn, export, &cluuid);
1208         }
1209
1210         /* If we found an export, we already unlocked. */
1211         if (!export) {
1212 no_export:
1213                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_CONNECT, 2 * obd_timeout);
1214         } else if (req->rq_export == NULL &&
1215                    atomic_read(&export->exp_rpc_count) > 0) {
1216                 LCONSOLE_WARN("%s: Client %s (at %s) refused connection, "
1217                               "still busy with %d references\n",
1218                               target->obd_name, cluuid.uuid,
1219                               libcfs_nid2str(req->rq_peer.nid),
1220                               atomic_read(&export->exp_refcount));
1221                         GOTO(out, rc = -EBUSY);
1222         } else if (lustre_msg_get_conn_cnt(req->rq_reqmsg) == 1 &&
1223                    rc != EALREADY) {
1224                 if (!strstr(cluuid.uuid, "mdt"))
1225                         LCONSOLE_WARN("%s: Rejecting reconnect from the "
1226                                       "known client %s (at %s) because it "
1227                                       "is indicating it is a new client",
1228                                       target->obd_name, cluuid.uuid,
1229                                       libcfs_nid2str(req->rq_peer.nid));
1230                 GOTO(out, rc = -EALREADY);
1231         } else {
1232                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_RECONNECT, 2 * obd_timeout);
1233         }
1234
1235         if (rc < 0) {
1236                 GOTO(out, rc);
1237         }
1238
1239         CDEBUG(D_HA, "%s: connection from %s@%s %st%llu exp %p cur %lld last %lld\n",
1240                target->obd_name, cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
1241                target->obd_recovering ? "recovering/" : "", data->ocd_transno,
1242                export, ktime_get_real_seconds(),
1243                export ? export->exp_last_request_time : 0);
1244
1245         /* If this is the first time a client connects, reset the recovery
1246          * timer. Discard lightweight connections which might be local. */
1247         if (!lw_client && rc == 0 && target->obd_recovering)
1248                 check_and_start_recovery_timer(target, req, export == NULL);
1249
1250         /* We want to handle EALREADY but *not* -EALREADY from
1251          * target_handle_reconnect(), return reconnection state in a flag. */
1252         if (rc == EALREADY) {
1253                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECONNECT);
1254                 rc = 0;
1255         } else {
1256                 LASSERT(rc == 0);
1257         }
1258
1259         /* Tell the client if we support replayable requests. */
1260         if (target->obd_replayable)
1261                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_REPLAYABLE);
1262         client_nid = &req->rq_peer.nid;
1263
1264         if (export == NULL) {
1265                 /* allow lightweight connections during recovery */
1266                 /* allow "new" MDT to be connected during recovery, since we
1267                  * need retrieve recovery update records from it */
1268                 if (target->obd_recovering && !lw_client && !mds_mds_conn) {
1269                         time64_t now;
1270                         time64_t t;
1271                         char *msg;
1272                         int c; /* connected */
1273                         int i; /* in progress */
1274                         int k; /* known */
1275                         int s; /* stale/evicted */
1276
1277                         c = atomic_read(&target->obd_connected_clients);
1278                         i = atomic_read(&target->obd_lock_replay_clients);
1279                         k = target->obd_max_recoverable_clients;
1280                         s = target->obd_stale_clients;
1281                         t = jiffies_to_msecs(target->obd_recovery_timer.expires);
1282                         t /= MSEC_PER_SEC;
1283                         now = ktime_get_seconds();
1284                         if (now > t) {
1285                                 t = now - t;
1286                                 msg = "already passed deadline";
1287                         } else {
1288                                 t -= now;
1289                                 msg = "to recover in";
1290                         }
1291
1292                         LCONSOLE_WARN("%s: Denying connection for new client %s"
1293                                       "(at %s), waiting for %d known clients "
1294                                       "(%d recovered, %d in progress, and %d "
1295                                       "evicted) %s %lld:%.02lld\n",
1296                                       target->obd_name, cluuid.uuid,
1297                                       libcfs_nid2str(req->rq_peer.nid), k,
1298                                       c - i, i, s, msg, t / 60, t % 60);
1299                         rc = -EBUSY;
1300                 } else {
1301 dont_check_exports:
1302                         rc = obd_connect(req->rq_svc_thread->t_env,
1303                                          &export, target, &cluuid, data,
1304                                          client_nid);
1305                         if (mds_conn && OBD_FAIL_CHECK(OBD_FAIL_TGT_RCVG_FLAG))
1306                                 lustre_msg_add_op_flags(req->rq_repmsg,
1307                                                         MSG_CONNECT_RECOVERING);
1308                         if (rc == 0) {
1309                                 conn.cookie = export->exp_handle.h_cookie;
1310                                 rc = rev_import_init(export);
1311                         }
1312
1313                         if (mds_mds_conn)
1314                                 new_mds_mds_conn = true;
1315                 }
1316         } else {
1317                 rc = obd_reconnect(req->rq_svc_thread->t_env,
1318                                    export, target, &cluuid, data, client_nid);
1319         }
1320         if (rc)
1321                 GOTO(out, rc);
1322
1323         LASSERT(target->u.obt.obt_magic == OBT_MAGIC);
1324         data->ocd_instance = target->u.obt.obt_instance;
1325
1326         /* Return only the parts of obd_connect_data that we understand, so the
1327          * client knows that we don't understand the rest. */
1328         if (data) {
1329                 tmpsize = req_capsule_get_size(&req->rq_pill, &RMF_CONNECT_DATA,
1330                                                RCL_SERVER);
1331                 tmpdata = req_capsule_server_get(&req->rq_pill,
1332                                                  &RMF_CONNECT_DATA);
1333                 /* Don't use struct assignment here, because the client reply
1334                  * buffer may be smaller/larger than the local struct
1335                  * obd_connect_data. */
1336                 memcpy(tmpdata, data, min(tmpsize, size));
1337         }
1338
1339         /* If the client and the server are the same node, we will already
1340          * have an export that really points to the client's DLM export,
1341          * because we have a shared handles table.
1342          *
1343          * XXX this will go away when shaver stops sending the "connect" handle
1344          * in the real "remote handle" field of the request --phik 24 Apr 2003
1345          */
1346         ptlrpc_request_change_export(req, export);
1347
1348         spin_lock(&export->exp_lock);
1349         if (export->exp_conn_cnt >= lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
1350                 spin_unlock(&export->exp_lock);
1351                 CDEBUG(D_RPCTRACE, "%s: %s already connected at greater "
1352                        "or equal conn_cnt: %d >= %d\n",
1353                        cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
1354                        export->exp_conn_cnt,
1355                        lustre_msg_get_conn_cnt(req->rq_reqmsg));
1356
1357                 GOTO(out, rc = -EALREADY);
1358         }
1359         LASSERT(lustre_msg_get_conn_cnt(req->rq_reqmsg) > 0);
1360         export->exp_conn_cnt = lustre_msg_get_conn_cnt(req->rq_reqmsg);
1361         spin_unlock(&export->exp_lock);
1362
1363         if (export->exp_connection != NULL) {
1364                 /* Check to see if connection came from another NID. */
1365                 if ((export->exp_connection->c_peer.nid != req->rq_peer.nid) &&
1366                     !hlist_unhashed(&export->exp_nid_hash))
1367                         cfs_hash_del(export->exp_obd->obd_nid_hash,
1368                                      &export->exp_connection->c_peer.nid,
1369                                      &export->exp_nid_hash);
1370
1371                 ptlrpc_connection_put(export->exp_connection);
1372         }
1373
1374         export->exp_connection = ptlrpc_connection_get(req->rq_peer,
1375                                                        req->rq_self,
1376                                                        &cluuid);
1377         if (hlist_unhashed(&export->exp_nid_hash))
1378                 cfs_hash_add(export->exp_obd->obd_nid_hash,
1379                              &export->exp_connection->c_peer.nid,
1380                              &export->exp_nid_hash);
1381
1382         lustre_msg_set_handle(req->rq_repmsg, &conn);
1383
1384         rc = rev_import_reconnect(export, req);
1385         if (rc != 0)
1386                 GOTO(out, rc);
1387
1388         if (target->obd_recovering && !export->exp_in_recovery && !lw_client) {
1389                 int has_transno;
1390                 __u64 transno = data->ocd_transno;
1391
1392                 spin_lock(&export->exp_lock);
1393                 /* possible race with class_disconnect_stale_exports,
1394                  * export may be already in the eviction process */
1395                 if (export->exp_failed) {
1396                         spin_unlock(&export->exp_lock);
1397                         GOTO(out, rc = -ENODEV);
1398                 }
1399                 export->exp_in_recovery = 1;
1400                 export->exp_req_replay_needed = 1;
1401                 export->exp_lock_replay_needed = 1;
1402                 spin_unlock(&export->exp_lock);
1403
1404                 has_transno = !!(lustre_msg_get_op_flags(req->rq_reqmsg) &
1405                                  MSG_CONNECT_TRANSNO);
1406                 if (has_transno && transno == 0)
1407                         CWARN("Connect with zero transno!\n");
1408
1409                 if (has_transno && transno > 0 &&
1410                     transno < target->obd_next_recovery_transno &&
1411                     transno > target->obd_last_committed) {
1412                         /* Another way is to use cmpxchg() to be lock-free. */
1413                         spin_lock(&target->obd_recovery_task_lock);
1414                         if (transno < target->obd_next_recovery_transno)
1415                                 target->obd_next_recovery_transno = transno;
1416                         spin_unlock(&target->obd_recovery_task_lock);
1417                 }
1418
1419                 atomic_inc(&target->obd_req_replay_clients);
1420                 atomic_inc(&target->obd_lock_replay_clients);
1421                 /* Note: MDS-MDS connection is allowed to be connected during
1422                  * recovery, no matter if the exports needs to be recoveried.
1423                  * Because we need retrieve updates logs from all other MDTs.
1424                  * So if the MDS-MDS export is new, obd_max_recoverable_clients
1425                  * also needs to be increased to match other recovery checking
1426                  * condition. */
1427                 if (new_mds_mds_conn)
1428                         target->obd_max_recoverable_clients++;
1429                 if (atomic_inc_return(&target->obd_connected_clients) ==
1430                     target->obd_max_recoverable_clients)
1431                         wake_up(&target->obd_next_transno_waitq);
1432         }
1433
1434         /* Tell the client we're in recovery, when client is involved in it. */
1435         if (target->obd_recovering && !lw_client)
1436                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECOVERING);
1437
1438 out:
1439         if (export) {
1440                 spin_lock(&export->exp_lock);
1441                 export->exp_connecting = 0;
1442                 spin_unlock(&export->exp_lock);
1443
1444                 class_export_put(export);
1445         }
1446         if (target != NULL) {
1447                 spin_lock(&target->obd_dev_lock);
1448                 target->obd_conn_inprogress--;
1449                 spin_unlock(&target->obd_dev_lock);
1450                 class_decref(target, "find", current);
1451         }
1452         req->rq_status = rc;
1453         RETURN(rc);
1454 }
1455
1456 int target_handle_disconnect(struct ptlrpc_request *req)
1457 {
1458         int rc;
1459         ENTRY;
1460
1461         rc = req_capsule_server_pack(&req->rq_pill);
1462         if (rc)
1463                 RETURN(rc);
1464
1465         /* Keep the rq_export around so we can send the reply. */
1466         req->rq_status = obd_disconnect(class_export_get(req->rq_export));
1467
1468         RETURN(0);
1469 }
1470
1471 void target_destroy_export(struct obd_export *exp)
1472 {
1473         struct obd_import       *imp = NULL;
1474         /* exports created from last_rcvd data, and "fake"
1475            exports created by lctl don't have an import */
1476         spin_lock(&exp->exp_lock);
1477         if (exp->exp_imp_reverse != NULL) {
1478                 imp = exp->exp_imp_reverse;
1479                 exp->exp_imp_reverse = NULL;
1480         }
1481         spin_unlock(&exp->exp_lock);
1482         if (imp != NULL)
1483                 client_destroy_import(imp);
1484
1485         LASSERT_ATOMIC_ZERO(&exp->exp_locks_count);
1486         LASSERT_ATOMIC_ZERO(&exp->exp_rpc_count);
1487         LASSERT_ATOMIC_ZERO(&exp->exp_cb_count);
1488         LASSERT_ATOMIC_ZERO(&exp->exp_replay_count);
1489 }
1490 EXPORT_SYMBOL(target_destroy_export);
1491
1492 /*
1493  * Recovery functions
1494  */
1495 static void target_request_copy_get(struct ptlrpc_request *req)
1496 {
1497         class_export_rpc_inc(req->rq_export);
1498         LASSERT(list_empty(&req->rq_list));
1499         INIT_LIST_HEAD(&req->rq_replay_list);
1500
1501         /* Increase refcount to keep request in queue. */
1502         atomic_inc(&req->rq_refcount);
1503         /* Let export know it has replays to be handled. */
1504         atomic_inc(&req->rq_export->exp_replay_count);
1505 }
1506
1507 static void target_request_copy_put(struct ptlrpc_request *req)
1508 {
1509         LASSERT(list_empty(&req->rq_replay_list));
1510         LASSERT_ATOMIC_POS(&req->rq_export->exp_replay_count);
1511
1512         atomic_dec(&req->rq_export->exp_replay_count);
1513         class_export_rpc_dec(req->rq_export);
1514         ptlrpc_server_drop_request(req);
1515 }
1516
1517 static int target_exp_enqueue_req_replay(struct ptlrpc_request *req)
1518 {
1519         __u64                  transno = lustre_msg_get_transno(req->rq_reqmsg);
1520         struct obd_export     *exp = req->rq_export;
1521         struct ptlrpc_request *reqiter;
1522         struct ptlrpc_request *dup_req = NULL;
1523         int                    dup = 0;
1524
1525         LASSERT(exp);
1526
1527         spin_lock(&exp->exp_lock);
1528         list_for_each_entry(reqiter, &exp->exp_req_replay_queue,
1529                                 rq_replay_list) {
1530                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) == transno) {
1531                         dup_req = reqiter;
1532                         dup = 1;
1533                         break;
1534                 }
1535         }
1536
1537         if (dup) {
1538                 /* We expect it with RESENT and REPLAY flags. */
1539                 if ((lustre_msg_get_flags(req->rq_reqmsg) &
1540                      (MSG_RESENT | MSG_REPLAY)) != (MSG_RESENT | MSG_REPLAY))
1541                         CERROR("invalid flags %x of resent replay\n",
1542                                lustre_msg_get_flags(req->rq_reqmsg));
1543
1544                 if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY) {
1545                         __u32 new_conn;
1546
1547                         new_conn = lustre_msg_get_conn_cnt(req->rq_reqmsg);
1548                         if (new_conn >
1549                             lustre_msg_get_conn_cnt(dup_req->rq_reqmsg))
1550                                 lustre_msg_set_conn_cnt(dup_req->rq_reqmsg,
1551                                                         new_conn);
1552                 }
1553         } else {
1554                 list_add_tail(&req->rq_replay_list,
1555                                   &exp->exp_req_replay_queue);
1556         }
1557
1558         spin_unlock(&exp->exp_lock);
1559         return dup;
1560 }
1561
1562 static void target_exp_dequeue_req_replay(struct ptlrpc_request *req)
1563 {
1564         LASSERT(!list_empty(&req->rq_replay_list));
1565         LASSERT(req->rq_export);
1566
1567         spin_lock(&req->rq_export->exp_lock);
1568         list_del_init(&req->rq_replay_list);
1569         spin_unlock(&req->rq_export->exp_lock);
1570 }
1571
1572 static void target_finish_recovery(struct lu_target *lut)
1573 {
1574         struct obd_device *obd = lut->lut_obd;
1575         ENTRY;
1576
1577         /* Only log a recovery message when recovery has occurred. */
1578         if (obd->obd_recovery_start) {
1579                 time64_t now = ktime_get_real_seconds();
1580                 time64_t elapsed_time;
1581
1582                 elapsed_time = max_t(time64_t, now - obd->obd_recovery_start, 1);
1583                 LCONSOLE_INFO("%s: Recovery over after %lld:%.02lld, of %d clients "
1584                         "%d recovered and %d %s evicted.\n", obd->obd_name,
1585                         (s64)elapsed_time / 60, (s64)elapsed_time % 60,
1586                         obd->obd_max_recoverable_clients,
1587                         atomic_read(&obd->obd_connected_clients),
1588                         obd->obd_stale_clients,
1589                         obd->obd_stale_clients == 1 ? "was" : "were");
1590         }
1591
1592         ldlm_reprocess_recovery_done(obd->obd_namespace);
1593         spin_lock(&obd->obd_recovery_task_lock);
1594         if (!list_empty(&obd->obd_req_replay_queue) ||
1595             !list_empty(&obd->obd_lock_replay_queue) ||
1596             !list_empty(&obd->obd_final_req_queue)) {
1597                 CERROR("%s: Recovery queues ( %s%s%s) are not empty\n",
1598                        obd->obd_name,
1599                        list_empty(&obd->obd_req_replay_queue) ? "" : "req ",
1600                        list_empty(&obd->obd_lock_replay_queue) ? \
1601                                "" : "lock ",
1602                        list_empty(&obd->obd_final_req_queue) ? \
1603                                "" : "final ");
1604                 spin_unlock(&obd->obd_recovery_task_lock);
1605                 LBUG();
1606         }
1607         spin_unlock(&obd->obd_recovery_task_lock);
1608
1609         obd->obd_recovery_end = ktime_get_real_seconds();
1610
1611         /* When recovery finished, cleanup orphans on MDS and OST. */
1612         if (obd->obd_type && OBP(obd, postrecov)) {
1613                 int rc = OBP(obd, postrecov)(obd);
1614
1615                 if (rc < 0)
1616                         LCONSOLE_WARN("%s: Post recovery failed, rc %d\n",
1617                                       obd->obd_name, rc);
1618         }
1619         EXIT;
1620 }
1621
1622 static void abort_req_replay_queue(struct obd_device *obd)
1623 {
1624         struct ptlrpc_request *req, *n;
1625         struct list_head abort_list;
1626
1627         INIT_LIST_HEAD(&abort_list);
1628         spin_lock(&obd->obd_recovery_task_lock);
1629         list_splice_init(&obd->obd_req_replay_queue, &abort_list);
1630         spin_unlock(&obd->obd_recovery_task_lock);
1631         list_for_each_entry_safe(req, n, &abort_list, rq_list) {
1632                 DEBUG_REQ(D_WARNING, req, "aborted:");
1633                 req->rq_status = -ENOTCONN;
1634                 if (ptlrpc_error(req)) {
1635                         DEBUG_REQ(D_ERROR, req,
1636                                   "failed abort_req_reply; skipping");
1637                 }
1638                 target_exp_dequeue_req_replay(req);
1639                 target_request_copy_put(req);
1640         }
1641 }
1642
1643 static void abort_lock_replay_queue(struct obd_device *obd)
1644 {
1645         struct ptlrpc_request *req, *n;
1646         struct list_head abort_list;
1647
1648         INIT_LIST_HEAD(&abort_list);
1649         spin_lock(&obd->obd_recovery_task_lock);
1650         list_splice_init(&obd->obd_lock_replay_queue, &abort_list);
1651         spin_unlock(&obd->obd_recovery_task_lock);
1652         list_for_each_entry_safe(req, n, &abort_list, rq_list) {
1653                 DEBUG_REQ(D_ERROR, req, "aborted:");
1654                 req->rq_status = -ENOTCONN;
1655                 if (ptlrpc_error(req)) {
1656                         DEBUG_REQ(D_ERROR, req,
1657                                   "failed abort_lock_reply; skipping");
1658                 }
1659                 target_request_copy_put(req);
1660         }
1661 }
1662
1663 /* Called from a cleanup function if the device is being cleaned up
1664    forcefully.  The exports should all have been disconnected already,
1665    the only thing left to do is
1666      - clear the recovery flags
1667      - cancel the timer
1668      - free queued requests and replies, but don't send replies
1669    Because the obd_stopping flag is set, no new requests should be received.
1670
1671 */
1672 void target_cleanup_recovery(struct obd_device *obd)
1673 {
1674         struct ptlrpc_request *req, *n;
1675         struct list_head clean_list;
1676
1677         INIT_LIST_HEAD(&clean_list);
1678         spin_lock(&obd->obd_dev_lock);
1679         if (!obd->obd_recovering) {
1680                 spin_unlock(&obd->obd_dev_lock);
1681                 EXIT;
1682                 return;
1683         }
1684         obd->obd_recovering = obd->obd_abort_recovery = 0;
1685         spin_unlock(&obd->obd_dev_lock);
1686
1687         spin_lock(&obd->obd_recovery_task_lock);
1688         target_cancel_recovery_timer(obd);
1689         list_splice_init(&obd->obd_req_replay_queue, &clean_list);
1690         spin_unlock(&obd->obd_recovery_task_lock);
1691
1692         list_for_each_entry_safe(req, n, &clean_list, rq_list) {
1693                 LASSERT(req->rq_reply_state == NULL);
1694                 target_exp_dequeue_req_replay(req);
1695                 target_request_copy_put(req);
1696         }
1697
1698         spin_lock(&obd->obd_recovery_task_lock);
1699         list_splice_init(&obd->obd_lock_replay_queue, &clean_list);
1700         list_splice_init(&obd->obd_final_req_queue, &clean_list);
1701         spin_unlock(&obd->obd_recovery_task_lock);
1702
1703         list_for_each_entry_safe(req, n, &clean_list, rq_list) {
1704                 LASSERT(req->rq_reply_state == NULL);
1705                 target_request_copy_put(req);
1706         }
1707
1708         EXIT;
1709 }
1710 EXPORT_SYMBOL(target_cleanup_recovery);
1711
1712 /* obd_recovery_task_lock should be held */
1713 void target_cancel_recovery_timer(struct obd_device *obd)
1714 {
1715         CDEBUG(D_HA, "%s: cancel recovery timer\n", obd->obd_name);
1716         del_timer(&obd->obd_recovery_timer);
1717 }
1718
1719 static void target_start_recovery_timer(struct obd_device *obd)
1720 {
1721         if (obd->obd_recovery_start != 0)
1722                 return;
1723
1724         spin_lock(&obd->obd_dev_lock);
1725         if (!obd->obd_recovering || obd->obd_abort_recovery) {
1726                 spin_unlock(&obd->obd_dev_lock);
1727                 return;
1728         }
1729
1730         LASSERT(obd->obd_recovery_timeout != 0);
1731
1732         if (obd->obd_recovery_start != 0) {
1733                 spin_unlock(&obd->obd_dev_lock);
1734                 return;
1735         }
1736
1737         mod_timer(&obd->obd_recovery_timer,
1738                   jiffies + cfs_time_seconds(obd->obd_recovery_timeout));
1739         obd->obd_recovery_start = ktime_get_real_seconds();
1740         spin_unlock(&obd->obd_dev_lock);
1741
1742         LCONSOLE_WARN("%s: Will be in recovery for at least %llu:%02llu, or until %d client%s reconnect%s\n",
1743                       obd->obd_name,
1744                       obd->obd_recovery_timeout / 60,
1745                       obd->obd_recovery_timeout % 60,
1746                       obd->obd_max_recoverable_clients,
1747                       (obd->obd_max_recoverable_clients == 1) ? "" : "s",
1748                       (obd->obd_max_recoverable_clients == 1) ? "s": "");
1749 }
1750
1751 /**
1752  * extend recovery window.
1753  *
1754  * if @extend is true, extend recovery window to have @drt remaining at least;
1755  * otherwise, make sure the recovery timeout value is not less than @drt.
1756  */
1757 static void extend_recovery_timer(struct obd_device *obd, time64_t drt,
1758                                   bool extend)
1759 {
1760         time64_t now;
1761         time64_t end;
1762         time64_t left;
1763         time64_t to;
1764
1765         spin_lock(&obd->obd_dev_lock);
1766         if (!obd->obd_recovering || obd->obd_abort_recovery) {
1767                 spin_unlock(&obd->obd_dev_lock);
1768                 return;
1769         }
1770         LASSERT(obd->obd_recovery_start != 0);
1771
1772         now = ktime_get_real_seconds();
1773         to = obd->obd_recovery_timeout;
1774         end = obd->obd_recovery_start + to;
1775         left = end - now;
1776
1777         if (extend && (drt > left)) {
1778                 to += drt - left;
1779         } else if (!extend && (drt > to)) {
1780                 to = drt;
1781         }
1782
1783         if (to > obd->obd_recovery_time_hard) {
1784                 to = obd->obd_recovery_time_hard;
1785                 CWARN("%s: extended recovery timer reaching hard limit: %lld, extend: %d\n",
1786                       obd->obd_name, to, extend);
1787         }
1788
1789         if (obd->obd_recovery_timeout < to) {
1790                 obd->obd_recovery_timeout = to;
1791                 end = obd->obd_recovery_start + to;
1792                 mod_timer(&obd->obd_recovery_timer,
1793                           jiffies + cfs_time_seconds(end - now));
1794         }
1795         spin_unlock(&obd->obd_dev_lock);
1796
1797         CDEBUG(D_HA, "%s: recovery timer will expire in %lld seconds\n",
1798                 obd->obd_name, (s64)(end - now));
1799 }
1800
1801 /* Reset the timer with each new client connection */
1802 /*
1803  * This timer is actually reconnect_timer, which is for making sure
1804  * the total recovery window is at least as big as my reconnect
1805  * attempt timing. So the initial recovery time_out will be set to
1806  * OBD_RECOVERY_FACTOR * obd_timeout. If the timeout coming
1807  * from client is bigger than this, then the recovery time_out will
1808  * be extended to make sure the client could be reconnected, in the
1809  * process, the timeout from the new client should be ignored.
1810  */
1811
1812 static void
1813 check_and_start_recovery_timer(struct obd_device *obd,
1814                                struct ptlrpc_request *req,
1815                                int new_client)
1816 {
1817         time64_t service_time = lustre_msg_get_service_time(req->rq_reqmsg);
1818         struct obd_device_target *obt = &obd->u.obt;
1819
1820         if (!new_client && service_time)
1821                 /* Teach server about old server's estimates, as first guess
1822                  * at how long new requests will take. */
1823                 at_measured(&req->rq_rqbd->rqbd_svcpt->scp_at_estimate,
1824                             service_time);
1825
1826         target_start_recovery_timer(obd);
1827
1828         /* Convert the service time to RPC timeout,
1829          * and reuse service_time to limit stack usage.
1830          */
1831         service_time = at_est2timeout(service_time);
1832
1833         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_SLUGGISH_NET) &&
1834             service_time < at_extra)
1835                 service_time = at_extra;
1836
1837         /* We expect other clients to timeout within service_time, then try
1838          * to reconnect, then try the failover server.  The max delay between
1839          * connect attempts is SWITCH_MAX + SWITCH_INC + INITIAL. */
1840         service_time += 2 * INITIAL_CONNECT_TIMEOUT;
1841
1842         LASSERT(obt->obt_magic == OBT_MAGIC);
1843         service_time += 2 * (CONNECTION_SWITCH_MAX + CONNECTION_SWITCH_INC);
1844         if (service_time > obd->obd_recovery_timeout && !new_client)
1845                 extend_recovery_timer(obd, service_time, false);
1846 }
1847
1848 /** Health checking routines */
1849 static inline int exp_connect_healthy(struct obd_export *exp)
1850 {
1851         return (exp->exp_in_recovery);
1852 }
1853
1854 /** if export done req_replay or has replay in queue */
1855 static inline int exp_req_replay_healthy(struct obd_export *exp)
1856 {
1857         return (!exp->exp_req_replay_needed ||
1858                 atomic_read(&exp->exp_replay_count) > 0);
1859 }
1860
1861
1862 static inline int exp_req_replay_healthy_or_from_mdt(struct obd_export *exp)
1863 {
1864         return (exp_connect_flags(exp) & OBD_CONNECT_MDS_MDS) ||
1865                exp_req_replay_healthy(exp);
1866 }
1867
1868 /** if export done lock_replay or has replay in queue */
1869 static inline int exp_lock_replay_healthy(struct obd_export *exp)
1870 {
1871         return (!exp->exp_lock_replay_needed ||
1872                 atomic_read(&exp->exp_replay_count) > 0);
1873 }
1874
1875 static inline int exp_vbr_healthy(struct obd_export *exp)
1876 {
1877         return (!exp->exp_vbr_failed);
1878 }
1879
1880 static inline int exp_finished(struct obd_export *exp)
1881 {
1882         return (exp->exp_in_recovery && !exp->exp_lock_replay_needed);
1883 }
1884
1885 static inline int exp_finished_or_from_mdt(struct obd_export *exp)
1886 {
1887         return (exp_connect_flags(exp) & OBD_CONNECT_MDS_MDS) ||
1888                 exp_finished(exp);
1889 }
1890
1891 static int check_for_next_transno(struct lu_target *lut)
1892 {
1893         struct ptlrpc_request *req = NULL;
1894         struct obd_device *obd = lut->lut_obd;
1895         struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
1896         int wake_up = 0, connected, completed, queue_len;
1897         __u64 req_transno = 0;
1898         __u64 update_transno = 0;
1899         __u64 next_transno = 0;
1900         ENTRY;
1901
1902         spin_lock(&obd->obd_recovery_task_lock);
1903         if (!list_empty(&obd->obd_req_replay_queue)) {
1904                 req = list_entry(obd->obd_req_replay_queue.next,
1905                                      struct ptlrpc_request, rq_list);
1906                 req_transno = lustre_msg_get_transno(req->rq_reqmsg);
1907         }
1908
1909         if (tdtd != NULL)
1910                 update_transno = distribute_txn_get_next_transno(tdtd);
1911
1912         connected = atomic_read(&obd->obd_connected_clients);
1913         completed = connected - atomic_read(&obd->obd_req_replay_clients);
1914         queue_len = obd->obd_requests_queued_for_recovery;
1915         next_transno = obd->obd_next_recovery_transno;
1916
1917         CDEBUG(D_HA, "max: %d, connected: %d, completed: %d, queue_len: %d, "
1918                "req_transno: %llu, next_transno: %llu\n",
1919                obd->obd_max_recoverable_clients, connected, completed,
1920                queue_len, req_transno, next_transno);
1921
1922         if (obd->obd_abort_recovery) {
1923                 CDEBUG(D_HA, "waking for aborted recovery\n");
1924                 wake_up = 1;
1925         } else if (obd->obd_recovery_expired) {
1926                 CDEBUG(D_HA, "waking for expired recovery\n");
1927                 wake_up = 1;
1928         } else if (tdtd != NULL && req != NULL &&
1929                    is_req_replayed_by_update(req)) {
1930                 LASSERTF(req_transno < next_transno, "req_transno %llu"
1931                          "next_transno%llu\n", req_transno, next_transno);
1932                 CDEBUG(D_HA, "waking for duplicate req (%llu)\n",
1933                        req_transno);
1934                 wake_up = 1;
1935         } else if (req_transno == next_transno ||
1936                    (update_transno != 0 && update_transno <= next_transno)) {
1937                 CDEBUG(D_HA, "waking for next (%lld)\n", next_transno);
1938                 wake_up = 1;
1939         } else if (queue_len > 0 &&
1940                    queue_len == atomic_read(&obd->obd_req_replay_clients)) {
1941                 /** handle gaps occured due to lost reply or VBR */
1942                 LASSERTF(req_transno >= next_transno,
1943                          "req_transno: %llu, next_transno: %llu\n",
1944                          req_transno, next_transno);
1945                 CDEBUG(D_HA,
1946                        "%s: waking for gap in transno, VBR is %s (skip: "
1947                        "%lld, ql: %d, comp: %d, conn: %d, next: %lld"
1948                        ", next_update %lld last_committed: %lld)\n",
1949                        obd->obd_name, obd->obd_version_recov ? "ON" : "OFF",
1950                        next_transno, queue_len, completed, connected,
1951                        req_transno, update_transno, obd->obd_last_committed);
1952                 obd->obd_next_recovery_transno = req_transno;
1953                 wake_up = 1;
1954         } else if (atomic_read(&obd->obd_req_replay_clients) == 0) {
1955                 CDEBUG(D_HA, "waking for completed recovery\n");
1956                 wake_up = 1;
1957         } else if (OBD_FAIL_CHECK(OBD_FAIL_MDS_RECOVERY_ACCEPTS_GAPS)) {
1958                 CDEBUG(D_HA, "accepting transno gaps is explicitly allowed"
1959                        " by fail_lock, waking up (%lld)\n", next_transno);
1960                 obd->obd_next_recovery_transno = req_transno;
1961                 wake_up = 1;
1962         }
1963         spin_unlock(&obd->obd_recovery_task_lock);
1964         return wake_up;
1965 }
1966
1967 static int check_for_next_lock(struct lu_target *lut)
1968 {
1969         struct obd_device *obd = lut->lut_obd;
1970         int wake_up = 0;
1971
1972         spin_lock(&obd->obd_recovery_task_lock);
1973         if (!list_empty(&obd->obd_lock_replay_queue)) {
1974                 CDEBUG(D_HA, "waking for next lock\n");
1975                 wake_up = 1;
1976         } else if (atomic_read(&obd->obd_lock_replay_clients) == 0) {
1977                 CDEBUG(D_HA, "waking for completed lock replay\n");
1978                 wake_up = 1;
1979         } else if (obd->obd_abort_recovery) {
1980                 CDEBUG(D_HA, "waking for aborted recovery\n");
1981                 wake_up = 1;
1982         } else if (obd->obd_recovery_expired) {
1983                 CDEBUG(D_HA, "waking for expired recovery\n");
1984                 wake_up = 1;
1985         }
1986         spin_unlock(&obd->obd_recovery_task_lock);
1987
1988         return wake_up;
1989 }
1990
1991 /**
1992  * wait for recovery events,
1993  * check its status with help of check_routine
1994  * evict dead clients via health_check
1995  */
1996 static int target_recovery_overseer(struct lu_target *lut,
1997                                     int (*check_routine)(struct lu_target *),
1998                                     int (*health_check)(struct obd_export *))
1999 {
2000         struct obd_device       *obd = lut->lut_obd;
2001         struct target_distribute_txn_data *tdtd;
2002         time64_t last = 0;
2003         time64_t now;
2004 repeat:
2005         if (obd->obd_recovering && obd->obd_recovery_start == 0) {
2006                 now = ktime_get_seconds();
2007                 if (now - last > 600) {
2008                         LCONSOLE_INFO("%s: in recovery but waiting for "
2009                                       "the first client to connect\n",
2010                                       obd->obd_name);
2011                         last = now;
2012                 }
2013         }
2014         if (obd->obd_recovery_start != 0 && ktime_get_real_seconds() >=
2015               (obd->obd_recovery_start + obd->obd_recovery_time_hard)) {
2016                 __u64 next_update_transno = 0;
2017
2018                 /* Only abort the recovery if there are no update recovery
2019                  * left in the queue */
2020                 spin_lock(&obd->obd_recovery_task_lock);
2021                 if (lut->lut_tdtd != NULL) {
2022                         next_update_transno =
2023                                 distribute_txn_get_next_transno(lut->lut_tdtd);
2024
2025                         tdtd = lut->lut_tdtd;
2026                         /* If next_update_transno == 0, it probably because
2027                          * updatelog retrieve threads did not get any records
2028                          * yet, let's wait those threads stopped */
2029                         if (next_update_transno == 0) {
2030                                 struct l_wait_info lwi = { 0 };
2031
2032                                 l_wait_event(tdtd->tdtd_recovery_threads_waitq,
2033                                        atomic_read(
2034                                        &tdtd->tdtd_recovery_threads_count) == 0,
2035                                        &lwi);
2036
2037                                 next_update_transno =
2038                                         distribute_txn_get_next_transno(
2039                                                                 lut->lut_tdtd);
2040                         }
2041                 }
2042
2043                 if (next_update_transno != 0 && !obd->obd_abort_recovery) {
2044                         obd->obd_next_recovery_transno = next_update_transno;
2045                         spin_unlock(&obd->obd_recovery_task_lock);
2046                         /* Disconnect unfinished exports from clients, and
2047                          * keep connection from MDT to make sure the update
2048                          * recovery will still keep trying until some one
2049                          * manually abort the recovery */
2050                         class_disconnect_stale_exports(obd,
2051                                                 exp_finished_or_from_mdt);
2052                         /* Abort all of replay and replay lock req from
2053                          * clients */
2054                         abort_req_replay_queue(obd);
2055                         abort_lock_replay_queue(obd);
2056                         CDEBUG(D_HA, "%s: there are still update replay (%#llx"
2057                                ")in the queue.\n", obd->obd_name,
2058                                next_update_transno);
2059                 } else {
2060                         obd->obd_abort_recovery = 1;
2061                         spin_unlock(&obd->obd_recovery_task_lock);
2062                         CWARN("%s recovery is aborted by hard timeout\n",
2063                               obd->obd_name);
2064                 }
2065         }
2066
2067         while (wait_event_timeout(obd->obd_next_transno_waitq,
2068                                   check_routine(lut),
2069                                   msecs_to_jiffies(60 * MSEC_PER_SEC)) == 0)
2070                 /* wait indefinitely for event, but don't trigger watchdog */;
2071
2072         if (obd->obd_abort_recovery) {
2073                 CWARN("recovery is aborted, evict exports in recovery\n");
2074                 if (lut->lut_tdtd != NULL) {
2075                         struct l_wait_info lwi = { 0 };
2076
2077                         tdtd = lut->lut_tdtd;
2078                         /* Let's wait all of the update log recovery thread
2079                          * finished */
2080                         l_wait_event(tdtd->tdtd_recovery_threads_waitq,
2081                          atomic_read(&tdtd->tdtd_recovery_threads_count) == 0,
2082                              &lwi);
2083                         /* Then abort the update recovery list */
2084                         dtrq_list_destroy(lut->lut_tdtd);
2085                 }
2086
2087                 /** evict exports which didn't finish recovery yet */
2088                 class_disconnect_stale_exports(obd, exp_finished);
2089                 return 1;
2090         } else if (obd->obd_recovery_expired) {
2091                 obd->obd_recovery_expired = 0;
2092                 /** If some clients died being recovered, evict them */
2093                 LCONSOLE_WARN("%s: recovery is timed out, "
2094                               "evict stale exports\n", obd->obd_name);
2095                 /** evict cexports with no replay in queue, they are stalled */
2096                 class_disconnect_stale_exports(obd, health_check);
2097
2098                 /** continue with VBR */
2099                 spin_lock(&obd->obd_dev_lock);
2100                 obd->obd_version_recov = 1;
2101                 spin_unlock(&obd->obd_dev_lock);
2102                 /**
2103                  * reset timer, recovery will proceed with versions now,
2104                  * timeout is set just to handle reconnection delays
2105                  */
2106                 extend_recovery_timer(obd, RECONNECT_DELAY_MAX, true);
2107                 /** Wait for recovery events again, after evicting bad clients */
2108                 goto repeat;
2109         }
2110         return 0;
2111 }
2112
2113 static struct ptlrpc_request *target_next_replay_lock(struct lu_target *lut)
2114 {
2115         struct obd_device       *obd = lut->lut_obd;
2116         struct ptlrpc_request *req = NULL;
2117
2118         CDEBUG(D_HA, "Waiting for lock\n");
2119         if (target_recovery_overseer(lut, check_for_next_lock,
2120                                      exp_lock_replay_healthy))
2121                 abort_lock_replay_queue(obd);
2122
2123         spin_lock(&obd->obd_recovery_task_lock);
2124         if (!list_empty(&obd->obd_lock_replay_queue)) {
2125                 req = list_entry(obd->obd_lock_replay_queue.next,
2126                                      struct ptlrpc_request, rq_list);
2127                 list_del_init(&req->rq_list);
2128                 spin_unlock(&obd->obd_recovery_task_lock);
2129         } else {
2130                 spin_unlock(&obd->obd_recovery_task_lock);
2131                 LASSERT(list_empty(&obd->obd_lock_replay_queue));
2132                 LASSERT(atomic_read(&obd->obd_lock_replay_clients) == 0);
2133                 /** evict exports failed VBR */
2134                 class_disconnect_stale_exports(obd, exp_vbr_healthy);
2135         }
2136         return req;
2137 }
2138
2139 static struct ptlrpc_request *target_next_final_ping(struct obd_device *obd)
2140 {
2141         struct ptlrpc_request *req = NULL;
2142
2143         spin_lock(&obd->obd_recovery_task_lock);
2144         if (!list_empty(&obd->obd_final_req_queue)) {
2145                 req = list_entry(obd->obd_final_req_queue.next,
2146                                      struct ptlrpc_request, rq_list);
2147                 list_del_init(&req->rq_list);
2148                 spin_unlock(&obd->obd_recovery_task_lock);
2149                 if (req->rq_export->exp_in_recovery) {
2150                         spin_lock(&req->rq_export->exp_lock);
2151                         req->rq_export->exp_in_recovery = 0;
2152                         spin_unlock(&req->rq_export->exp_lock);
2153                 }
2154         } else {
2155                 spin_unlock(&obd->obd_recovery_task_lock);
2156         }
2157         return req;
2158 }
2159
2160 static void handle_recovery_req(struct ptlrpc_thread *thread,
2161                                 struct ptlrpc_request *req,
2162                                 svc_handler_t handler)
2163 {
2164         ENTRY;
2165
2166         /**
2167          * export can be evicted during recovery, no need to handle replays for
2168          * it after that, discard such request silently
2169          */
2170         if (req->rq_export->exp_disconnected)
2171                 RETURN_EXIT;
2172
2173         req->rq_session.lc_thread = thread;
2174         req->rq_svc_thread = thread;
2175         req->rq_svc_thread->t_env->le_ses = &req->rq_session;
2176
2177         /* thread context */
2178         lu_context_enter(&thread->t_env->le_ctx);
2179         (void)handler(req);
2180         lu_context_exit(&thread->t_env->le_ctx);
2181
2182         /* don't reset timer for final stage */
2183         if (!exp_finished(req->rq_export)) {
2184                 time64_t to = obd_timeout;
2185
2186                 /**
2187                  * Add request timeout to the recovery time so next request from
2188                  * this client may come in recovery time
2189                  */
2190                 if (!AT_OFF) {
2191                         struct ptlrpc_service_part *svcpt;
2192
2193                         svcpt = req->rq_rqbd->rqbd_svcpt;
2194                         /* If the server sent early reply for this request,
2195                          * the client will recalculate the timeout according to
2196                          * current server estimate service time, so we will
2197                          * use the maxium timeout here for waiting the client
2198                          * sending the next req */
2199                         to = max((int)at_est2timeout(
2200                                  at_get(&svcpt->scp_at_estimate)),
2201                                  (int)lustre_msg_get_timeout(req->rq_reqmsg));
2202                         /* Add 2 net_latency, one for balance rq_deadline
2203                          * (see ptl_send_rpc), one for resend the req to server,
2204                          * Note: client will pack net_latency in replay req
2205                          * (see ptlrpc_replay_req) */
2206                         to += 2 * lustre_msg_get_service_time(req->rq_reqmsg);
2207                 }
2208                 extend_recovery_timer(class_exp2obd(req->rq_export), to, true);
2209         }
2210         EXIT;
2211 }
2212
2213 /** Checking routines for recovery */
2214 static int check_for_recovery_ready(struct lu_target *lut)
2215 {
2216         struct obd_device *obd = lut->lut_obd;
2217         unsigned int clnts = atomic_read(&obd->obd_connected_clients);
2218
2219         CDEBUG(D_HA, "connected %d stale %d max_recoverable_clients %d"
2220                " abort %d expired %d\n", clnts, obd->obd_stale_clients,
2221                obd->obd_max_recoverable_clients, obd->obd_abort_recovery,
2222                obd->obd_recovery_expired);
2223
2224         if (!obd->obd_abort_recovery && !obd->obd_recovery_expired) {
2225                 LASSERT(clnts <= obd->obd_max_recoverable_clients);
2226                 if (clnts + obd->obd_stale_clients <
2227                     obd->obd_max_recoverable_clients)
2228                         return 0;
2229         }
2230
2231         if (lut->lut_tdtd != NULL) {
2232                 if (!lut->lut_tdtd->tdtd_replay_ready &&
2233                     !obd->obd_abort_recovery) {
2234                         /* Let's extend recovery timer, in case the recovery
2235                          * timer expired, and some clients got evicted */
2236                         extend_recovery_timer(obd, obd->obd_recovery_timeout,
2237                                               true);
2238                         CDEBUG(D_HA, "%s update recovery is not ready, extend recovery %llu\n",
2239                                obd->obd_name, obd->obd_recovery_timeout);
2240                         return 0;
2241                 }
2242         }
2243
2244         return 1;
2245 }
2246
2247 enum {
2248         REQUEST_RECOVERY = 1,
2249         UPDATE_RECOVERY = 2,
2250 };
2251
2252 static __u64 get_next_replay_req_transno(struct obd_device *obd)
2253 {
2254         __u64 transno = 0;
2255
2256         if (!list_empty(&obd->obd_req_replay_queue)) {
2257                 struct ptlrpc_request *req;
2258
2259                 req = list_entry(obd->obd_req_replay_queue.next,
2260                                  struct ptlrpc_request, rq_list);
2261                 transno = lustre_msg_get_transno(req->rq_reqmsg);
2262         }
2263
2264         return transno;
2265 }
2266
2267 static __u64 get_next_transno(struct lu_target *lut, int *type)
2268 {
2269         struct obd_device *obd = lut->lut_obd;
2270         struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
2271         __u64 transno = 0;
2272         __u64 update_transno;
2273         ENTRY;
2274
2275         transno = get_next_replay_req_transno(obd);
2276         if (type != NULL)
2277                 *type = REQUEST_RECOVERY;
2278
2279         if (tdtd == NULL)
2280                 RETURN(transno);
2281
2282         update_transno = distribute_txn_get_next_transno(tdtd);
2283         if (transno == 0 || (transno >= update_transno &&
2284                              update_transno != 0)) {
2285                 transno = update_transno;
2286                 if (type != NULL)
2287                         *type = UPDATE_RECOVERY;
2288         }
2289
2290         RETURN(transno);
2291 }
2292
2293 /**
2294  * drop duplicate replay request
2295  *
2296  * Because the operation has been replayed by update recovery, the request
2297  * with the same transno will be dropped and also notify the client to send
2298  * next replay request.
2299  *
2300  * \param[in] env       execution environment
2301  * \param[in] obd       failover obd device
2302  * \param[in] req       request to be dropped
2303  */
2304 static void drop_duplicate_replay_req(struct lu_env *env,
2305                                       struct obd_device *obd,
2306                                       struct ptlrpc_request *req)
2307 {
2308         DEBUG_REQ(D_HA, req, "remove t%lld from %s because of duplicate"
2309                   " update records are found.\n",
2310                   lustre_msg_get_transno(req->rq_reqmsg),
2311                   libcfs_nid2str(req->rq_peer.nid));
2312
2313         /* Right now, only for MDS reint operation update replay and
2314          * normal request replay can have the same transno */
2315         if (lustre_msg_get_opc(req->rq_reqmsg) == MDS_REINT) {
2316                 req_capsule_set(&req->rq_pill, &RQF_MDS_REINT);
2317                 req->rq_status = req_capsule_server_pack(&req->rq_pill);
2318                 if (likely(req->rq_export))
2319                         target_committed_to_req(req);
2320                 lustre_msg_set_transno(req->rq_repmsg, req->rq_transno);
2321                 target_send_reply(req, req->rq_status, 0);
2322         } else {
2323                 DEBUG_REQ(D_ERROR, req, "wrong opc" "from %s\n",
2324                 libcfs_nid2str(req->rq_peer.nid));
2325         }
2326         target_exp_dequeue_req_replay(req);
2327         target_request_copy_put(req);
2328         obd->obd_replayed_requests++;
2329 }
2330
2331 static void replay_request_or_update(struct lu_env *env,
2332                                      struct lu_target *lut,
2333                                      struct target_recovery_data *trd,
2334                                      struct ptlrpc_thread *thread)
2335 {
2336         struct obd_device *obd = lut->lut_obd;
2337         struct ptlrpc_request *req = NULL;
2338         int                     type;
2339         __u64                   transno;
2340         ENTRY;
2341
2342         CDEBUG(D_HA, "Waiting for transno %lld\n",
2343                obd->obd_next_recovery_transno);
2344
2345         /* Replay all of request and update by transno */
2346         do {
2347                 struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
2348
2349                 CFS_FAIL_TIMEOUT(OBD_FAIL_TGT_REPLAY_DELAY2, cfs_fail_val);
2350
2351                 /** It is needed to extend recovery window above
2352                  *  recovery_time_soft. Extending is possible only in the
2353                  *  end of recovery window (see more details in
2354                  *  handle_recovery_req()).
2355                  */
2356                 CFS_FAIL_TIMEOUT_MS(OBD_FAIL_TGT_REPLAY_DELAY, 300);
2357
2358                 if (target_recovery_overseer(lut, check_for_next_transno,
2359                                         exp_req_replay_healthy_or_from_mdt)) {
2360                         abort_req_replay_queue(obd);
2361                         abort_lock_replay_queue(obd);
2362                         goto abort;
2363                 }
2364
2365                 spin_lock(&obd->obd_recovery_task_lock);
2366                 transno = get_next_transno(lut, &type);
2367                 if (type == REQUEST_RECOVERY && transno != 0) {
2368                         /* Drop replay request from client side, if the
2369                          * replay has been executed by update with the
2370                          * same transno */
2371                         req = list_entry(obd->obd_req_replay_queue.next,
2372                                         struct ptlrpc_request, rq_list);
2373
2374                         list_del_init(&req->rq_list);
2375                         obd->obd_requests_queued_for_recovery--;
2376                         spin_unlock(&obd->obd_recovery_task_lock);
2377
2378                         /* Let's check if the request has been redone by
2379                          * update replay */
2380                         if (is_req_replayed_by_update(req)) {
2381                                 struct distribute_txn_replay_req *dtrq;
2382
2383                                 dtrq = distribute_txn_lookup_finish_list(tdtd,
2384                                                                    req->rq_xid);
2385                                 LASSERT(dtrq != NULL);
2386                                 spin_lock(&tdtd->tdtd_replay_list_lock);
2387                                 list_del_init(&dtrq->dtrq_list);
2388                                 spin_unlock(&tdtd->tdtd_replay_list_lock);
2389                                 dtrq_destroy(dtrq);
2390
2391                                 drop_duplicate_replay_req(env, obd, req);
2392
2393                                 continue;
2394                         }
2395
2396                         LASSERT(trd->trd_processing_task == current_pid());
2397                         DEBUG_REQ(D_HA, req, "processing t%lld from %s",
2398                                   lustre_msg_get_transno(req->rq_reqmsg),
2399                                   libcfs_nid2str(req->rq_peer.nid));
2400
2401                         handle_recovery_req(thread, req,
2402                                             trd->trd_recovery_handler);
2403                         /**
2404                          * bz18031: increase next_recovery_transno before
2405                          * target_request_copy_put() will drop exp_rpc reference
2406                          */
2407                         spin_lock(&obd->obd_recovery_task_lock);
2408                         obd->obd_next_recovery_transno++;
2409                         spin_unlock(&obd->obd_recovery_task_lock);
2410                         target_exp_dequeue_req_replay(req);
2411                         target_request_copy_put(req);
2412                         obd->obd_replayed_requests++;
2413                 } else if (type == UPDATE_RECOVERY && transno != 0) {
2414                         struct distribute_txn_replay_req *dtrq;
2415                         int rc;
2416
2417                         spin_unlock(&obd->obd_recovery_task_lock);
2418
2419                         LASSERT(tdtd != NULL);
2420                         dtrq = distribute_txn_get_next_req(tdtd);
2421                         lu_context_enter(&thread->t_env->le_ctx);
2422                         rc = tdtd->tdtd_replay_handler(env, tdtd, dtrq);
2423                         lu_context_exit(&thread->t_env->le_ctx);
2424                         extend_recovery_timer(obd, obd_timeout, true);
2425
2426                         if (rc == 0 && dtrq->dtrq_xid != 0) {
2427                                 CDEBUG(D_HA, "Move x%llu t%llu"
2428                                        " to finish list\n", dtrq->dtrq_xid,
2429                                        dtrq->dtrq_master_transno);
2430
2431                                 /* Add it to the replay finish list */
2432                                 spin_lock(&tdtd->tdtd_replay_list_lock);
2433                                 list_add(&dtrq->dtrq_list,
2434                                          &tdtd->tdtd_replay_finish_list);
2435                                 spin_unlock(&tdtd->tdtd_replay_list_lock);
2436
2437                                 spin_lock(&obd->obd_recovery_task_lock);
2438                                 if (transno == obd->obd_next_recovery_transno)
2439                                         obd->obd_next_recovery_transno++;
2440                                 else if (transno >
2441                                          obd->obd_next_recovery_transno)
2442                                         obd->obd_next_recovery_transno =
2443                                                                 transno + 1;
2444                                 spin_unlock(&obd->obd_recovery_task_lock);
2445                         } else {
2446                                 dtrq_destroy(dtrq);
2447                         }
2448                 } else {
2449                         spin_unlock(&obd->obd_recovery_task_lock);
2450 abort:
2451                         LASSERT(list_empty(&obd->obd_req_replay_queue));
2452                         LASSERT(atomic_read(&obd->obd_req_replay_clients) == 0);
2453                         /** evict exports failed VBR */
2454                         class_disconnect_stale_exports(obd, exp_vbr_healthy);
2455                         break;
2456                 }
2457         } while (1);
2458 }
2459
2460 static int target_recovery_thread(void *arg)
2461 {
2462         struct lu_target *lut = arg;
2463         struct obd_device *obd = lut->lut_obd;
2464         struct ptlrpc_request *req;
2465         struct target_recovery_data *trd = &obd->obd_recovery_data;
2466         unsigned long delta;
2467         struct lu_env *env;
2468         struct ptlrpc_thread *thread = NULL;
2469         int rc = 0;
2470         ENTRY;
2471
2472         unshare_fs_struct();
2473         OBD_ALLOC_PTR(thread);
2474         if (thread == NULL)
2475                 RETURN(-ENOMEM);
2476
2477         OBD_ALLOC_PTR(env);
2478         if (env == NULL) {
2479                 OBD_FREE_PTR(thread);
2480                 RETURN(-ENOMEM);
2481         }
2482
2483         rc = lu_context_init(&env->le_ctx, LCT_MD_THREAD | LCT_DT_THREAD);
2484         if (rc) {
2485                 OBD_FREE_PTR(thread);
2486                 OBD_FREE_PTR(env);
2487                 RETURN(rc);
2488         }
2489
2490         thread->t_env = env;
2491         thread->t_id = -1; /* force filter_iobuf_get/put to use local buffers */
2492         env->le_ctx.lc_thread = thread;
2493         tgt_io_thread_init(thread); /* init thread_big_cache for IO requests */
2494
2495         CDEBUG(D_HA, "%s: started recovery thread pid %d\n", obd->obd_name,
2496                current_pid());
2497         trd->trd_processing_task = current_pid();
2498
2499         spin_lock(&obd->obd_dev_lock);
2500         obd->obd_recovering = 1;
2501         spin_unlock(&obd->obd_dev_lock);
2502         complete(&trd->trd_starting);
2503
2504         /* first of all, we have to know the first transno to replay */
2505         if (target_recovery_overseer(lut, check_for_recovery_ready,
2506                                      exp_connect_healthy)) {
2507                 abort_req_replay_queue(obd);
2508                 abort_lock_replay_queue(obd);
2509                 if (lut->lut_tdtd != NULL)
2510                         dtrq_list_destroy(lut->lut_tdtd);
2511         }
2512
2513         /* next stage: replay requests or update */
2514         delta = jiffies;
2515         CDEBUG(D_INFO, "1: request replay stage - %d clients from t%llu\n",
2516                atomic_read(&obd->obd_req_replay_clients),
2517                obd->obd_next_recovery_transno);
2518         replay_request_or_update(env, lut, trd, thread);
2519
2520         /**
2521          * The second stage: replay locks
2522          */
2523         CDEBUG(D_INFO, "2: lock replay stage - %d clients\n",
2524                atomic_read(&obd->obd_lock_replay_clients));
2525         while ((req = target_next_replay_lock(lut))) {
2526                 LASSERT(trd->trd_processing_task == current_pid());
2527                 DEBUG_REQ(D_HA, req, "processing lock from %s: ",
2528                           libcfs_nid2str(req->rq_peer.nid));
2529                 handle_recovery_req(thread, req,
2530                                     trd->trd_recovery_handler);
2531                 target_request_copy_put(req);
2532                 obd->obd_replayed_locks++;
2533         }
2534
2535         /**
2536          * The third stage: reply on final pings, at this moment all clients
2537          * must have request in final queue
2538          */
2539         CFS_FAIL_TIMEOUT(OBD_FAIL_TGT_REPLAY_RECONNECT, cfs_fail_val);
2540         CDEBUG(D_INFO, "3: final stage - process recovery completion pings\n");
2541         /** Update server last boot epoch */
2542         tgt_boot_epoch_update(lut);
2543         /* We drop recoverying flag to forward all new requests
2544          * to regular mds_handle() since now */
2545         spin_lock(&obd->obd_dev_lock);
2546         obd->obd_recovering = obd->obd_abort_recovery = 0;
2547         spin_unlock(&obd->obd_dev_lock);
2548         spin_lock(&obd->obd_recovery_task_lock);
2549         target_cancel_recovery_timer(obd);
2550         spin_unlock(&obd->obd_recovery_task_lock);
2551         while ((req = target_next_final_ping(obd))) {
2552                 LASSERT(trd->trd_processing_task == current_pid());
2553                 DEBUG_REQ(D_HA, req, "processing final ping from %s: ",
2554                           libcfs_nid2str(req->rq_peer.nid));
2555                 handle_recovery_req(thread, req,
2556                                     trd->trd_recovery_handler);
2557                 /* Because the waiting client can not send ping to server,
2558                  * so we need refresh the last_request_time, to avoid the
2559                  * export is being evicted */
2560                 ptlrpc_update_export_timer(req->rq_export, 0);
2561                 target_request_copy_put(req);
2562         }
2563
2564         delta = jiffies_to_msecs(jiffies - delta) / MSEC_PER_SEC;
2565         CDEBUG(D_INFO,"4: recovery completed in %lus - %d/%d reqs/locks\n",
2566               delta, obd->obd_replayed_requests, obd->obd_replayed_locks);
2567         if (delta > OBD_RECOVERY_TIME_SOFT) {
2568                 CWARN("too long recovery - read logs\n");
2569                 libcfs_debug_dumplog();
2570         }
2571
2572         target_finish_recovery(lut);
2573
2574         lu_context_fini(&env->le_ctx);
2575         trd->trd_processing_task = 0;
2576         complete(&trd->trd_finishing);
2577
2578         tgt_io_thread_done(thread);
2579         OBD_FREE_PTR(thread);
2580         OBD_FREE_PTR(env);
2581         RETURN(rc);
2582 }
2583
2584 static int target_start_recovery_thread(struct lu_target *lut,
2585                                         svc_handler_t handler)
2586 {
2587         struct obd_device *obd = lut->lut_obd;
2588         int rc = 0;
2589         struct target_recovery_data *trd = &obd->obd_recovery_data;
2590         int index;
2591
2592         memset(trd, 0, sizeof(*trd));
2593         init_completion(&trd->trd_starting);
2594         init_completion(&trd->trd_finishing);
2595         trd->trd_recovery_handler = handler;
2596
2597         rc = server_name2index(obd->obd_name, &index, NULL);
2598         if (rc < 0)
2599                 return rc;
2600
2601         if (!IS_ERR(kthread_run(target_recovery_thread,
2602                                 lut, "tgt_recover_%d", index))) {
2603                 wait_for_completion(&trd->trd_starting);
2604                 LASSERT(obd->obd_recovering != 0);
2605         } else {
2606                 rc = -ECHILD;
2607         }
2608
2609         return rc;
2610 }
2611
2612 void target_stop_recovery_thread(struct obd_device *obd)
2613 {
2614         if (obd->obd_recovery_data.trd_processing_task > 0) {
2615                 struct target_recovery_data *trd = &obd->obd_recovery_data;
2616                 /** recovery can be done but postrecovery is not yet */
2617                 spin_lock(&obd->obd_dev_lock);
2618                 if (obd->obd_recovering) {
2619                         CERROR("%s: Aborting recovery\n", obd->obd_name);
2620                         obd->obd_abort_recovery = 1;
2621                         wake_up(&obd->obd_next_transno_waitq);
2622                 }
2623                 spin_unlock(&obd->obd_dev_lock);
2624                 wait_for_completion(&trd->trd_finishing);
2625         }
2626 }
2627 EXPORT_SYMBOL(target_stop_recovery_thread);
2628
2629 void target_recovery_fini(struct obd_device *obd)
2630 {
2631         class_disconnect_exports(obd);
2632         target_stop_recovery_thread(obd);
2633         target_cleanup_recovery(obd);
2634 }
2635 EXPORT_SYMBOL(target_recovery_fini);
2636
2637 static void target_recovery_expired(cfs_timer_cb_arg_t data)
2638 {
2639         struct obd_device *obd = cfs_from_timer(obd, data, obd_recovery_timer);
2640         CDEBUG(D_HA, "%s: recovery timed out; %d clients are still in recovery"
2641                " after %llus (%d clients connected)\n",
2642                obd->obd_name, atomic_read(&obd->obd_lock_replay_clients),
2643                (s64)(ktime_get_real_seconds() - obd->obd_recovery_start),
2644                atomic_read(&obd->obd_connected_clients));
2645
2646         obd->obd_recovery_expired = 1;
2647         wake_up(&obd->obd_next_transno_waitq);
2648 }
2649
2650 void target_recovery_init(struct lu_target *lut, svc_handler_t handler)
2651 {
2652         struct obd_device *obd = lut->lut_obd;
2653
2654         if (lut->lut_bottom->dd_rdonly)
2655                 return;
2656
2657         if (obd->obd_max_recoverable_clients == 0) {
2658                 /** Update server last boot epoch */
2659                 tgt_boot_epoch_update(lut);
2660                 return;
2661         }
2662
2663         CDEBUG(D_HA, "RECOVERY: service %s, %d recoverable clients, "
2664                "last_transno %llu\n", obd->obd_name,
2665                obd->obd_max_recoverable_clients, obd->obd_last_committed);
2666         LASSERT(obd->obd_stopping == 0);
2667         obd->obd_next_recovery_transno = obd->obd_last_committed + 1;
2668         obd->obd_recovery_start = 0;
2669         obd->obd_recovery_end = 0;
2670
2671         cfs_timer_setup(&obd->obd_recovery_timer, target_recovery_expired,
2672                         (unsigned long)obd, 0);
2673         target_start_recovery_thread(lut, handler);
2674 }
2675 EXPORT_SYMBOL(target_recovery_init);
2676
2677 static int target_process_req_flags(struct obd_device *obd,
2678                                     struct ptlrpc_request *req)
2679 {
2680         struct obd_export *exp = req->rq_export;
2681         LASSERT(exp != NULL);
2682         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
2683                 /* client declares he's ready to replay locks */
2684                 spin_lock(&exp->exp_lock);
2685                 if (exp->exp_req_replay_needed) {
2686                         exp->exp_req_replay_needed = 0;
2687                         spin_unlock(&exp->exp_lock);
2688
2689                         LASSERT_ATOMIC_POS(&obd->obd_req_replay_clients);
2690                         atomic_dec(&obd->obd_req_replay_clients);
2691                 } else {
2692                         spin_unlock(&exp->exp_lock);
2693                 }
2694         }
2695         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
2696                 /* client declares he's ready to complete recovery
2697                  * so, we put the request on th final queue */
2698                 spin_lock(&exp->exp_lock);
2699                 if (exp->exp_lock_replay_needed) {
2700                         exp->exp_lock_replay_needed = 0;
2701                         spin_unlock(&exp->exp_lock);
2702
2703                         LASSERT_ATOMIC_POS(&obd->obd_lock_replay_clients);
2704                         atomic_dec(&obd->obd_lock_replay_clients);
2705                 } else {
2706                         spin_unlock(&exp->exp_lock);
2707                 }
2708         }
2709         return 0;
2710 }
2711
2712 int target_queue_recovery_request(struct ptlrpc_request *req,
2713                                   struct obd_device *obd)
2714 {
2715         __u64 transno = lustre_msg_get_transno(req->rq_reqmsg);
2716         struct ptlrpc_request *reqiter;
2717         int inserted = 0;
2718         ENTRY;
2719
2720         if (obd->obd_recovery_data.trd_processing_task == current_pid()) {
2721                 /* Processing the queue right now, don't re-add. */
2722                 RETURN(1);
2723         }
2724
2725         target_process_req_flags(obd, req);
2726
2727         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
2728                 if (unlikely(OBD_FAIL_CHECK(OBD_FAIL_TGT_RECOVERY_REQ_RACE))) {
2729                         if (cfs_fail_val == 1) {
2730                                 cfs_race_state = 1;
2731                                 cfs_fail_val = 0;
2732                                 wake_up(&cfs_race_waitq);
2733
2734                                 set_current_state(TASK_INTERRUPTIBLE);
2735                                 schedule_timeout(cfs_time_seconds(1));
2736                         }
2737                 }
2738
2739                 /* client declares he's ready to complete recovery
2740                  * so, we put the request on th final queue */
2741                 target_request_copy_get(req);
2742                 DEBUG_REQ(D_HA, req, "queue final req");
2743                 wake_up(&obd->obd_next_transno_waitq);
2744                 spin_lock(&obd->obd_recovery_task_lock);
2745                 if (obd->obd_recovering) {
2746                         struct ptlrpc_request *tmp;
2747                         struct ptlrpc_request *duplicate = NULL;
2748
2749                         if (likely(!req->rq_export->exp_replay_done)) {
2750                                 req->rq_export->exp_replay_done = 1;
2751                                 list_add_tail(&req->rq_list,
2752                                               &obd->obd_final_req_queue);
2753                                 spin_unlock(&obd->obd_recovery_task_lock);
2754                                 RETURN(0);
2755                         }
2756
2757                         /* XXX O(n), but only happens if final ping is
2758                          * timed out, probably reorganize the list as
2759                          * a hash list later */
2760                         list_for_each_entry_safe(reqiter, tmp,
2761                                                  &obd->obd_final_req_queue,
2762                                                  rq_list) {
2763                                 if (reqiter->rq_export == req->rq_export) {
2764                                         list_del_init(&reqiter->rq_list);
2765                                         duplicate = reqiter;
2766                                         break;
2767                                 }
2768                         }
2769
2770                         list_add_tail(&req->rq_list,
2771                                       &obd->obd_final_req_queue);
2772                         req->rq_export->exp_replay_done = 1;
2773                         spin_unlock(&obd->obd_recovery_task_lock);
2774
2775                         if (duplicate != NULL) {
2776                                 DEBUG_REQ(D_HA, duplicate,
2777                                           "put prev final req\n");
2778                                 target_request_copy_put(duplicate);
2779                         }
2780                         RETURN(0);
2781                 } else {
2782                         spin_unlock(&obd->obd_recovery_task_lock);
2783                         target_request_copy_put(req);
2784                         RETURN(obd->obd_stopping ? -ENOTCONN : 1);
2785                 }
2786         }
2787         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
2788                 /* client declares he's ready to replay locks */
2789                 target_request_copy_get(req);
2790                 DEBUG_REQ(D_HA, req, "queue lock replay req");
2791                 wake_up(&obd->obd_next_transno_waitq);
2792                 spin_lock(&obd->obd_recovery_task_lock);
2793                 LASSERT(obd->obd_recovering);
2794                 /* usually due to recovery abort */
2795                 if (!req->rq_export->exp_in_recovery) {
2796                         spin_unlock(&obd->obd_recovery_task_lock);
2797                         target_request_copy_put(req);
2798                         RETURN(-ENOTCONN);
2799                 }
2800                 LASSERT(req->rq_export->exp_lock_replay_needed);
2801                 list_add_tail(&req->rq_list, &obd->obd_lock_replay_queue);
2802                 spin_unlock(&obd->obd_recovery_task_lock);
2803                 RETURN(0);
2804         }
2805
2806         /* CAVEAT EMPTOR: The incoming request message has been swabbed
2807          * (i.e. buflens etc are in my own byte order), but type-dependent
2808          * buffers (eg mdt_body, ost_body etc) have NOT been swabbed. */
2809
2810         if (!transno) {
2811                 INIT_LIST_HEAD(&req->rq_list);
2812                 DEBUG_REQ(D_HA, req, "not queueing");
2813                 RETURN(1);
2814         }
2815
2816         /* If we're processing the queue, we want don't want to queue this
2817          * message.
2818          *
2819          * Also, if this request has a transno less than the one we're waiting
2820          * for, we should process it now.  It could (and currently always will)
2821          * be an open request for a descriptor that was opened some time ago.
2822          *
2823          * Also, a resent, replayed request that has already been
2824          * handled will pass through here and be processed immediately.
2825          */
2826         CDEBUG(D_HA, "Next recovery transno: %llu"
2827                ", current: %llu, replaying\n",
2828                obd->obd_next_recovery_transno, transno);
2829
2830         /* If the request has been replayed by update replay, then sends this
2831          * request to the recovery thread (replay_request_or_update()), where
2832          * it will be handled */
2833         spin_lock(&obd->obd_recovery_task_lock);
2834         if (transno < obd->obd_next_recovery_transno &&
2835             !is_req_replayed_by_update(req)) {
2836                 /* Processing the queue right now, don't re-add. */
2837                 LASSERT(list_empty(&req->rq_list));
2838                 spin_unlock(&obd->obd_recovery_task_lock);
2839                 RETURN(1);
2840         }
2841         spin_unlock(&obd->obd_recovery_task_lock);
2842
2843         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_REPLAY_DROP))
2844                 RETURN(0);
2845
2846         target_request_copy_get(req);
2847         if (!req->rq_export->exp_in_recovery) {
2848                 target_request_copy_put(req);
2849                 RETURN(-ENOTCONN);
2850         }
2851         LASSERT(req->rq_export->exp_req_replay_needed);
2852
2853         if (target_exp_enqueue_req_replay(req)) {
2854                 DEBUG_REQ(D_ERROR, req, "dropping resent queued req");
2855                 target_request_copy_put(req);
2856                 RETURN(0);
2857         }
2858
2859         /* XXX O(n^2) */
2860         spin_lock(&obd->obd_recovery_task_lock);
2861         LASSERT(obd->obd_recovering);
2862         list_for_each_entry(reqiter, &obd->obd_req_replay_queue, rq_list) {
2863                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) > transno) {
2864                         list_add_tail(&req->rq_list, &reqiter->rq_list);
2865                         inserted = 1;
2866                         goto added;
2867                 }
2868
2869                 if (unlikely(lustre_msg_get_transno(reqiter->rq_reqmsg) ==
2870                              transno)) {
2871                         DEBUG_REQ(D_ERROR, req, "dropping replay: transno "
2872                                   "has been claimed by another client");
2873                         spin_unlock(&obd->obd_recovery_task_lock);
2874                         target_exp_dequeue_req_replay(req);
2875                         target_request_copy_put(req);
2876                         RETURN(0);
2877                 }
2878         }
2879 added:
2880         if (!inserted)
2881                 list_add_tail(&req->rq_list, &obd->obd_req_replay_queue);
2882
2883         obd->obd_requests_queued_for_recovery++;
2884         spin_unlock(&obd->obd_recovery_task_lock);
2885         wake_up(&obd->obd_next_transno_waitq);
2886         RETURN(0);
2887 }
2888
2889 void target_committed_to_req(struct ptlrpc_request *req)
2890 {
2891         struct obd_export *exp = req->rq_export;
2892
2893         if (!exp->exp_obd->obd_no_transno && req->rq_repmsg != NULL)
2894                 lustre_msg_set_last_committed(req->rq_repmsg,
2895                                               exp->exp_last_committed);
2896         else
2897                 DEBUG_REQ(D_IOCTL, req, "not sending last_committed update (%d/"
2898                           "%d)", exp->exp_obd->obd_no_transno,
2899                           req->rq_repmsg == NULL);
2900
2901         CDEBUG(D_INFO, "last_committed %llu, transno %llu, xid %llu\n",
2902                exp->exp_last_committed, req->rq_transno, req->rq_xid);
2903 }
2904
2905 #endif /* HAVE_SERVER_SUPPORT */
2906
2907 /**
2908  * Packs current SLV and Limit into \a req.
2909  */
2910 int target_pack_pool_reply(struct ptlrpc_request *req)
2911 {
2912         struct obd_device *obd;
2913         ENTRY;
2914
2915         /* Check that we still have all structures alive as this may
2916          * be some late RPC at shutdown time. */
2917         if (unlikely(!req->rq_export || !req->rq_export->exp_obd ||
2918                      !exp_connect_lru_resize(req->rq_export))) {
2919                 lustre_msg_set_slv(req->rq_repmsg, 0);
2920                 lustre_msg_set_limit(req->rq_repmsg, 0);
2921                 RETURN(0);
2922         }
2923
2924         /* OBD is alive here as export is alive, which we checked above. */
2925         obd = req->rq_export->exp_obd;
2926
2927         read_lock(&obd->obd_pool_lock);
2928         lustre_msg_set_slv(req->rq_repmsg, obd->obd_pool_slv);
2929         lustre_msg_set_limit(req->rq_repmsg, obd->obd_pool_limit);
2930         read_unlock(&obd->obd_pool_lock);
2931
2932         RETURN(0);
2933 }
2934
2935 static int target_send_reply_msg(struct ptlrpc_request *req,
2936                                  int rc, int fail_id)
2937 {
2938         if (OBD_FAIL_CHECK_ORSET(fail_id & ~OBD_FAIL_ONCE, OBD_FAIL_ONCE)) {
2939                 DEBUG_REQ(D_ERROR, req, "dropping reply");
2940                 return -ECOMM;
2941         }
2942         /* We can have a null rq_reqmsg in the event of bad signature or
2943          * no context when unwrapping */
2944         if (req->rq_reqmsg &&
2945             unlikely(lustre_msg_get_opc(req->rq_reqmsg) == MDS_REINT &&
2946             OBD_FAIL_CHECK(OBD_FAIL_MDS_REINT_MULTI_NET_REP)))
2947                 return -ECOMM;
2948
2949         if (unlikely(rc)) {
2950                 DEBUG_REQ(D_NET, req, "processing error (%d)", rc);
2951                 req->rq_status = rc;
2952                 return ptlrpc_send_error(req, 1);
2953         } else {
2954                 DEBUG_REQ(D_NET, req, "sending reply");
2955         }
2956
2957         return ptlrpc_send_reply(req, PTLRPC_REPLY_MAYBE_DIFFICULT);
2958 }
2959
2960 void target_send_reply(struct ptlrpc_request *req, int rc, int fail_id)
2961 {
2962         struct ptlrpc_service_part *svcpt;
2963         int                        netrc;
2964         struct ptlrpc_reply_state *rs;
2965         struct obd_export         *exp;
2966         ENTRY;
2967
2968         if (req->rq_no_reply) {
2969                 EXIT;
2970                 return;
2971         }
2972
2973         svcpt = req->rq_rqbd->rqbd_svcpt;
2974         rs = req->rq_reply_state;
2975         if (rs == NULL || !rs->rs_difficult) {
2976                 /* no notifiers */
2977                 target_send_reply_msg (req, rc, fail_id);
2978                 EXIT;
2979                 return;
2980         }
2981
2982         /* must be an export if locks saved */
2983         LASSERT(req->rq_export != NULL);
2984         /* req/reply consistent */
2985         LASSERT(rs->rs_svcpt == svcpt);
2986
2987         /* "fresh" reply */
2988         LASSERT(!rs->rs_scheduled);
2989         LASSERT(!rs->rs_scheduled_ever);
2990         LASSERT(!rs->rs_handled);
2991         LASSERT(!rs->rs_on_net);
2992         LASSERT(rs->rs_export == NULL);
2993         LASSERT(list_empty(&rs->rs_obd_list));
2994         LASSERT(list_empty(&rs->rs_exp_list));
2995
2996         exp = class_export_get(req->rq_export);
2997
2998         /* disable reply scheduling while I'm setting up */
2999         rs->rs_scheduled = 1;
3000         rs->rs_on_net    = 1;
3001         rs->rs_xid       = req->rq_xid;
3002         rs->rs_transno   = req->rq_transno;
3003         rs->rs_export    = exp;
3004         rs->rs_opc       = lustre_msg_get_opc(req->rq_reqmsg);
3005
3006         spin_lock(&exp->exp_uncommitted_replies_lock);
3007         CDEBUG(D_NET, "rs transno = %llu, last committed = %llu\n",
3008                rs->rs_transno, exp->exp_last_committed);
3009         if (rs->rs_transno > exp->exp_last_committed) {
3010                 /* not committed already */
3011                 list_add_tail(&rs->rs_obd_list,
3012                                   &exp->exp_uncommitted_replies);
3013         }
3014         spin_unlock(&exp->exp_uncommitted_replies_lock);
3015
3016         spin_lock(&exp->exp_lock);
3017         list_add_tail(&rs->rs_exp_list, &exp->exp_outstanding_replies);
3018         spin_unlock(&exp->exp_lock);
3019
3020         netrc = target_send_reply_msg(req, rc, fail_id);
3021
3022         spin_lock(&svcpt->scp_rep_lock);
3023
3024         atomic_inc(&svcpt->scp_nreps_difficult);
3025
3026         if (netrc != 0) {
3027                 /* error sending: reply is off the net.  Also we need +1
3028                  * reply ref until ptlrpc_handle_rs() is done
3029                  * with the reply state (if the send was successful, there
3030                  * would have been +1 ref for the net, which
3031                  * reply_out_callback leaves alone) */
3032                 rs->rs_on_net = 0;
3033                 ptlrpc_rs_addref(rs);
3034         }
3035
3036         spin_lock(&rs->rs_lock);
3037         if (rs->rs_transno <= exp->exp_last_committed ||
3038             (!rs->rs_on_net && !rs->rs_no_ack) ||
3039             list_empty(&rs->rs_exp_list) ||     /* completed already */
3040             list_empty(&rs->rs_obd_list)) {
3041                 CDEBUG(D_HA, "Schedule reply immediately\n");
3042                 ptlrpc_dispatch_difficult_reply(rs);
3043         } else {
3044                 list_add(&rs->rs_list, &svcpt->scp_rep_active);
3045                 rs->rs_scheduled = 0;   /* allow notifier to schedule */
3046         }
3047         spin_unlock(&rs->rs_lock);
3048         spin_unlock(&svcpt->scp_rep_lock);
3049         EXIT;
3050 }
3051
3052 enum ldlm_mode lck_compat_array[] = {
3053         [LCK_EX]    = LCK_COMPAT_EX,
3054         [LCK_PW]    = LCK_COMPAT_PW,
3055         [LCK_PR]    = LCK_COMPAT_PR,
3056         [LCK_CW]    = LCK_COMPAT_CW,
3057         [LCK_CR]    = LCK_COMPAT_CR,
3058         [LCK_NL]    = LCK_COMPAT_NL,
3059         [LCK_GROUP] = LCK_COMPAT_GROUP,
3060         [LCK_COS]   = LCK_COMPAT_COS,
3061 };
3062
3063 /**
3064  * Rather arbitrary mapping from LDLM error codes to errno values. This should
3065  * not escape to the user level.
3066  */
3067 int ldlm_error2errno(enum ldlm_error error)
3068 {
3069         int result;
3070
3071         switch (error) {
3072         case ELDLM_OK:
3073         case ELDLM_LOCK_MATCHED:
3074                 result = 0;
3075                 break;
3076         case ELDLM_LOCK_CHANGED:
3077                 result = -ESTALE;
3078                 break;
3079         case ELDLM_LOCK_ABORTED:
3080                 result = -ENAVAIL;
3081                 break;
3082         case ELDLM_LOCK_REPLACED:
3083                 result = -ESRCH;
3084                 break;
3085         case ELDLM_NO_LOCK_DATA:
3086                 result = -ENOENT;
3087                 break;
3088         case ELDLM_NAMESPACE_EXISTS:
3089                 result = -EEXIST;
3090                 break;
3091         case ELDLM_BAD_NAMESPACE:
3092                 result = -EBADF;
3093                 break;
3094         default:
3095                 if (((int)error) < 0) { /* cast to signed type */
3096                         result = error; /* as ldlm_error can be unsigned */
3097                 } else {
3098                         CERROR("Invalid DLM result code: %d\n", error);
3099                         result = -EPROTO;
3100                 }
3101         }
3102         return result;
3103 }
3104 EXPORT_SYMBOL(ldlm_error2errno);
3105
3106 /**
3107  * Dual to ldlm_error2errno(): maps errno values back to enum ldlm_error.
3108  */
3109 enum ldlm_error ldlm_errno2error(int err_no)
3110 {
3111         int error;
3112
3113         switch (err_no) {
3114         case 0:
3115                 error = ELDLM_OK;
3116                 break;
3117         case -ESTALE:
3118                 error = ELDLM_LOCK_CHANGED;
3119                 break;
3120         case -ENAVAIL:
3121                 error = ELDLM_LOCK_ABORTED;
3122                 break;
3123         case -ESRCH:
3124                 error = ELDLM_LOCK_REPLACED;
3125                 break;
3126         case -ENOENT:
3127                 error = ELDLM_NO_LOCK_DATA;
3128                 break;
3129         case -EEXIST:
3130                 error = ELDLM_NAMESPACE_EXISTS;
3131                 break;
3132         case -EBADF:
3133                 error = ELDLM_BAD_NAMESPACE;
3134                 break;
3135         default:
3136                 error = err_no;
3137         }
3138         return error;
3139 }
3140
3141 #if LUSTRE_TRACKS_LOCK_EXP_REFS
3142 void ldlm_dump_export_locks(struct obd_export *exp)
3143 {
3144         spin_lock(&exp->exp_locks_list_guard);
3145         if (!list_empty(&exp->exp_locks_list)) {
3146                 struct ldlm_lock *lock;
3147
3148                 CERROR("dumping locks for export %p,"
3149                        "ignore if the unmount doesn't hang\n", exp);
3150                 list_for_each_entry(lock, &exp->exp_locks_list,
3151                                         l_exp_refs_link)
3152                         LDLM_ERROR(lock, "lock:");
3153         }
3154         spin_unlock(&exp->exp_locks_list_guard);
3155 }
3156 #endif
3157
3158 #ifdef HAVE_SERVER_SUPPORT
3159 static int target_bulk_timeout(void *data)
3160 {
3161         ENTRY;
3162         /* We don't fail the connection here, because having the export
3163          * killed makes the (vital) call to commitrw very sad.
3164          */
3165         RETURN(1);
3166 }
3167
3168 static inline const char *bulk2type(struct ptlrpc_req