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LU-8130 ptlrpc: convert conn_hash to rhashtable
[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/kernel.h>
45 #include <linux/kthread.h>
46 #include <libcfs/libcfs.h>
47 #include <obd.h>
48 #include <obd_class.h>
49 #include <lustre_dlm.h>
50 #include <lustre_net.h>
51 #include <lustre_sec.h>
52 #include "ldlm_internal.h"
53
54 /*
55  * @priority: If non-zero, move the selected connection to the list head.
56  * @create: If zero, only search in existing connections.
57  */
58 static int import_set_conn(struct obd_import *imp, struct obd_uuid *uuid,
59                            int priority, int create)
60 {
61         struct ptlrpc_connection *ptlrpc_conn;
62         struct obd_import_conn *imp_conn = NULL, *item;
63         lnet_nid_t nid4refnet = LNET_NID_ANY;
64         int rc = 0;
65
66         ENTRY;
67
68         if (!create && !priority) {
69                 CDEBUG(D_HA, "Nothing to do\n");
70                 RETURN(-EINVAL);
71         }
72
73         if (imp->imp_connection &&
74             imp->imp_connection->c_remote_uuid.uuid[0] == 0)
75                 /* nid4refnet is used to restrict network connections */
76                 nid4refnet = imp->imp_connection->c_self;
77         ptlrpc_conn = ptlrpc_uuid_to_connection(uuid, nid4refnet);
78         if (!ptlrpc_conn) {
79                 CDEBUG(D_HA, "can't find connection %s\n", uuid->uuid);
80                 RETURN(-ENOENT);
81         }
82
83         if (create) {
84                 OBD_ALLOC(imp_conn, sizeof(*imp_conn));
85                 if (!imp_conn)
86                         GOTO(out_put, rc = -ENOMEM);
87         }
88
89         spin_lock(&imp->imp_lock);
90         list_for_each_entry(item, &imp->imp_conn_list, oic_item) {
91                 if (obd_uuid_equals(uuid, &item->oic_uuid)) {
92                         if (priority) {
93                                 list_move(&item->oic_item,
94                                           &imp->imp_conn_list);
95                                 item->oic_last_attempt = 0;
96                         }
97                         CDEBUG(D_HA, "imp %p@%s: found existing conn %s%s\n",
98                                imp, imp->imp_obd->obd_name, uuid->uuid,
99                                (priority ? ", moved to head" : ""));
100                         spin_unlock(&imp->imp_lock);
101                         GOTO(out_free, rc = 0);
102                 }
103         }
104         /* No existing import connection found for \a uuid. */
105         if (create) {
106                 imp_conn->oic_conn = ptlrpc_conn;
107                 imp_conn->oic_uuid = *uuid;
108                 imp_conn->oic_last_attempt = 0;
109                 if (priority)
110                         list_add(&imp_conn->oic_item, &imp->imp_conn_list);
111                 else
112                         list_add_tail(&imp_conn->oic_item,
113                                       &imp->imp_conn_list);
114                 CDEBUG(D_HA, "imp %p@%s: add connection %s at %s\n",
115                        imp, imp->imp_obd->obd_name, uuid->uuid,
116                        (priority ? "head" : "tail"));
117         } else {
118                 spin_unlock(&imp->imp_lock);
119                 GOTO(out_free, rc = -ENOENT);
120         }
121
122         spin_unlock(&imp->imp_lock);
123         RETURN(0);
124 out_free:
125         if (imp_conn)
126                 OBD_FREE(imp_conn, sizeof(*imp_conn));
127 out_put:
128         ptlrpc_connection_put(ptlrpc_conn);
129         RETURN(rc);
130 }
131
132 int import_set_conn_priority(struct obd_import *imp, struct obd_uuid *uuid)
133 {
134         return import_set_conn(imp, uuid, 1, 0);
135 }
136
137 int client_import_add_conn(struct obd_import *imp, struct obd_uuid *uuid,
138                            int priority)
139 {
140         return import_set_conn(imp, uuid, priority, 1);
141 }
142 EXPORT_SYMBOL(client_import_add_conn);
143
144 int client_import_del_conn(struct obd_import *imp, struct obd_uuid *uuid)
145 {
146         struct obd_import_conn *imp_conn;
147         struct obd_export *dlmexp;
148         int rc = -ENOENT;
149
150         ENTRY;
151
152         spin_lock(&imp->imp_lock);
153         if (list_empty(&imp->imp_conn_list)) {
154                 LASSERT(!imp->imp_connection);
155                 GOTO(out, rc);
156         }
157
158         list_for_each_entry(imp_conn, &imp->imp_conn_list, oic_item) {
159                 if (!obd_uuid_equals(uuid, &imp_conn->oic_uuid))
160                         continue;
161                 LASSERT(imp_conn->oic_conn);
162
163                 if (imp_conn == imp->imp_conn_current) {
164                         LASSERT(imp_conn->oic_conn == imp->imp_connection);
165
166                         if (imp->imp_state != LUSTRE_IMP_CLOSED &&
167                             imp->imp_state != LUSTRE_IMP_DISCON) {
168                                 CERROR("can't remove current connection\n");
169                                 GOTO(out, rc = -EBUSY);
170                         }
171
172                         ptlrpc_connection_put(imp->imp_connection);
173                         imp->imp_connection = NULL;
174
175                         dlmexp = class_conn2export(&imp->imp_dlm_handle);
176                         if (dlmexp && dlmexp->exp_connection) {
177                                 LASSERT(dlmexp->exp_connection ==
178                                         imp_conn->oic_conn);
179                                 ptlrpc_connection_put(dlmexp->exp_connection);
180                                 dlmexp->exp_connection = NULL;
181                         }
182
183                         if (dlmexp != NULL)
184                                 class_export_put(dlmexp);
185                 }
186
187                 list_del(&imp_conn->oic_item);
188                 ptlrpc_connection_put(imp_conn->oic_conn);
189                 OBD_FREE(imp_conn, sizeof(*imp_conn));
190                 CDEBUG(D_HA, "imp %p@%s: remove connection %s\n",
191                        imp, imp->imp_obd->obd_name, uuid->uuid);
192                 rc = 0;
193                 break;
194         }
195 out:
196         spin_unlock(&imp->imp_lock);
197         if (rc == -ENOENT)
198                 CERROR("connection %s not found\n", uuid->uuid);
199         RETURN(rc);
200 }
201 EXPORT_SYMBOL(client_import_del_conn);
202
203 /**
204  * Find conn UUID by peer NID. \a peer is a server NID. This function is used
205  * to find a conn uuid of \a imp which can reach \a peer.
206  */
207 int client_import_find_conn(struct obd_import *imp, lnet_nid_t peer,
208                             struct obd_uuid *uuid)
209 {
210         struct obd_import_conn *conn;
211         int rc = -ENOENT;
212
213         ENTRY;
214
215         spin_lock(&imp->imp_lock);
216         list_for_each_entry(conn, &imp->imp_conn_list, oic_item) {
217                 /* Check if conn UUID does have this peer NID. */
218                 if (class_check_uuid(&conn->oic_uuid, peer)) {
219                         *uuid = conn->oic_uuid;
220                         rc = 0;
221                         break;
222                 }
223         }
224         spin_unlock(&imp->imp_lock);
225         RETURN(rc);
226 }
227 EXPORT_SYMBOL(client_import_find_conn);
228
229 void client_destroy_import(struct obd_import *imp)
230 {
231         /*
232          * Drop security policy instance after all RPCs have finished/aborted
233          * to let all busy contexts be released.
234          */
235         class_import_get(imp);
236         class_destroy_import(imp);
237         sptlrpc_import_sec_put(imp);
238         class_import_put(imp);
239 }
240 EXPORT_SYMBOL(client_destroy_import);
241
242 /**
243  * Check whether or not the OSC is on MDT.
244  * In the config log,
245  * osc on MDT
246  *      setup 0:{fsname}-OSTxxxx-osc[-MDTxxxx] 1:lustre-OST0000_UUID 2:NID
247  * osc on client
248  *      setup 0:{fsname}-OSTxxxx-osc 1:lustre-OST0000_UUID 2:NID
249  *
250  **/
251 static int osc_on_mdt(char *obdname)
252 {
253         char *ptr;
254
255         ptr = strrchr(obdname, '-');
256         if (ptr == NULL)
257                 return 0;
258
259         if (strncmp(ptr + 1, "MDT", 3) == 0)
260                 return 1;
261
262         return 0;
263 }
264
265 /*
266  * Configure an RPC client OBD device.
267  *
268  * lcfg parameters:
269  * 1 - client UUID
270  * 2 - server UUID
271  * 3 - inactive-on-startup
272  * 4 - restrictive net
273  */
274 int client_obd_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
275 {
276         struct client_obd *cli = &obd->u.cli;
277         struct obd_import *imp;
278         struct obd_uuid server_uuid;
279         int rq_portal, rp_portal, connect_op;
280         const char *name = obd->obd_type->typ_name;
281         enum ldlm_ns_type ns_type = LDLM_NS_TYPE_UNKNOWN;
282         char *cli_name = lustre_cfg_buf(lcfg, 0);
283         struct ptlrpc_connection fake_conn = { .c_self = 0,
284                                                .c_remote_uuid.uuid[0] = 0 };
285         int rc;
286
287         ENTRY;
288
289         /*
290          * In a more perfect world, we would hang a ptlrpc_client off of
291          * obd_type and just use the values from there.
292          */
293         if (!strcmp(name, LUSTRE_OSC_NAME)) {
294                 rq_portal = OST_REQUEST_PORTAL;
295                 rp_portal = OSC_REPLY_PORTAL;
296                 connect_op = OST_CONNECT;
297                 cli->cl_sp_me = LUSTRE_SP_CLI;
298                 cli->cl_sp_to = LUSTRE_SP_OST;
299                 ns_type = LDLM_NS_TYPE_OSC;
300         } else if (!strcmp(name, LUSTRE_MDC_NAME) ||
301                    !strcmp(name, LUSTRE_LWP_NAME)) {
302                 rq_portal = MDS_REQUEST_PORTAL;
303                 rp_portal = MDC_REPLY_PORTAL;
304                 connect_op = MDS_CONNECT;
305                 if (is_lwp_on_ost(cli_name))
306                         cli->cl_sp_me = LUSTRE_SP_OST;
307                 else if (is_lwp_on_mdt(cli_name))
308                         cli->cl_sp_me = LUSTRE_SP_MDT;
309                 else
310                         cli->cl_sp_me = LUSTRE_SP_CLI;
311                 cli->cl_sp_to = LUSTRE_SP_MDT;
312                 ns_type = LDLM_NS_TYPE_MDC;
313         } else if (!strcmp(name, LUSTRE_OSP_NAME)) {
314                 if (strstr(lustre_cfg_buf(lcfg, 1), "OST") == NULL) {
315                         /* OSP_on_MDT for other MDTs */
316                         connect_op = MDS_CONNECT;
317                         cli->cl_sp_to = LUSTRE_SP_MDT;
318                         ns_type = LDLM_NS_TYPE_MDC;
319                         rq_portal = OUT_PORTAL;
320                 } else {
321                         /* OSP on MDT for OST */
322                         connect_op = OST_CONNECT;
323                         cli->cl_sp_to = LUSTRE_SP_OST;
324                         ns_type = LDLM_NS_TYPE_OSC;
325                         rq_portal = OST_REQUEST_PORTAL;
326                 }
327                 rp_portal = OSC_REPLY_PORTAL;
328                 cli->cl_sp_me = LUSTRE_SP_MDT;
329         } else if (!strcmp(name, LUSTRE_MGC_NAME)) {
330                 rq_portal = MGS_REQUEST_PORTAL;
331                 rp_portal = MGC_REPLY_PORTAL;
332                 connect_op = MGS_CONNECT;
333                 cli->cl_sp_me = LUSTRE_SP_MGC;
334                 cli->cl_sp_to = LUSTRE_SP_MGS;
335                 cli->cl_flvr_mgc.sf_rpc = SPTLRPC_FLVR_INVALID;
336                 ns_type = LDLM_NS_TYPE_MGC;
337         } else {
338                 CERROR("unknown client OBD type \"%s\", can't setup\n",
339                        name);
340                 RETURN(-EINVAL);
341         }
342
343         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
344                 CERROR("requires a TARGET UUID\n");
345                 RETURN(-EINVAL);
346         }
347
348         if (LUSTRE_CFG_BUFLEN(lcfg, 1) > 37) {
349                 CERROR("client UUID must be less than 38 characters\n");
350                 RETURN(-EINVAL);
351         }
352
353         if (LUSTRE_CFG_BUFLEN(lcfg, 2) < 1) {
354                 CERROR("setup requires a SERVER UUID\n");
355                 RETURN(-EINVAL);
356         }
357
358         if (LUSTRE_CFG_BUFLEN(lcfg, 2) > 37) {
359                 CERROR("target UUID must be less than 38 characters\n");
360                 RETURN(-EINVAL);
361         }
362
363         init_rwsem(&cli->cl_sem);
364         mutex_init(&cli->cl_mgc_mutex);
365         cli->cl_seq = NULL;
366         init_rwsem(&cli->cl_seq_rwsem);
367         cli->cl_conn_count = 0;
368         memcpy(server_uuid.uuid, lustre_cfg_buf(lcfg, 2),
369                min_t(unsigned int, LUSTRE_CFG_BUFLEN(lcfg, 2),
370                      sizeof(server_uuid)));
371
372         cli->cl_dirty_pages = 0;
373         cli->cl_dirty_max_pages = 0;
374         cli->cl_avail_grant = 0;
375         /* FIXME: Should limit this for the sum of all cl_dirty_max_pages. */
376         /*
377          * cl_dirty_max_pages may be changed at connect time in
378          * ptlrpc_connect_interpret().
379          */
380         client_adjust_max_dirty(cli);
381         init_waitqueue_head(&cli->cl_cache_waiters);
382         INIT_LIST_HEAD(&cli->cl_loi_ready_list);
383         INIT_LIST_HEAD(&cli->cl_loi_hp_ready_list);
384         INIT_LIST_HEAD(&cli->cl_loi_write_list);
385         INIT_LIST_HEAD(&cli->cl_loi_read_list);
386         spin_lock_init(&cli->cl_loi_list_lock);
387         atomic_set(&cli->cl_pending_w_pages, 0);
388         atomic_set(&cli->cl_pending_r_pages, 0);
389         cli->cl_r_in_flight = 0;
390         cli->cl_w_in_flight = 0;
391
392         spin_lock_init(&cli->cl_read_rpc_hist.oh_lock);
393         spin_lock_init(&cli->cl_write_rpc_hist.oh_lock);
394         spin_lock_init(&cli->cl_read_page_hist.oh_lock);
395         spin_lock_init(&cli->cl_write_page_hist.oh_lock);
396         spin_lock_init(&cli->cl_read_offset_hist.oh_lock);
397         spin_lock_init(&cli->cl_write_offset_hist.oh_lock);
398
399         /* lru for osc. */
400         INIT_LIST_HEAD(&cli->cl_lru_osc);
401         atomic_set(&cli->cl_lru_shrinkers, 0);
402         atomic_long_set(&cli->cl_lru_busy, 0);
403         atomic_long_set(&cli->cl_lru_in_list, 0);
404         INIT_LIST_HEAD(&cli->cl_lru_list);
405         spin_lock_init(&cli->cl_lru_list_lock);
406         atomic_long_set(&cli->cl_unstable_count, 0);
407         INIT_LIST_HEAD(&cli->cl_shrink_list);
408         INIT_LIST_HEAD(&cli->cl_grant_chain);
409
410         INIT_LIST_HEAD(&cli->cl_flight_waiters);
411         cli->cl_rpcs_in_flight = 0;
412
413         init_waitqueue_head(&cli->cl_destroy_waitq);
414         atomic_set(&cli->cl_destroy_in_flight, 0);
415
416
417         cli->cl_supp_cksum_types = OBD_CKSUM_CRC32;
418         cli->cl_preferred_cksum_type = 0;
419 #ifdef ENABLE_CHECKSUM
420         /* Turn on checksumming by default. */
421         cli->cl_checksum = 1;
422         /*
423          * The supported checksum types will be worked out at connect time
424          * Set cl_chksum* to CRC32 for now to avoid returning screwed info
425          * through procfs.
426          */
427         cli->cl_cksum_type = cli->cl_supp_cksum_types;
428 #endif
429         atomic_set(&cli->cl_resends, OSC_DEFAULT_RESENDS);
430
431         /*
432          * Set it to possible maximum size. It may be reduced by ocd_brw_size
433          * from OFD after connecting.
434          */
435         cli->cl_max_pages_per_rpc = PTLRPC_MAX_BRW_PAGES;
436
437         cli->cl_max_short_io_bytes = OBD_DEF_SHORT_IO_BYTES;
438
439         /*
440          * set cl_chunkbits default value to PAGE_SHIFT,
441          * it will be updated at OSC connection time.
442          */
443         cli->cl_chunkbits = PAGE_SHIFT;
444
445         if (!strcmp(name, LUSTRE_MDC_NAME)) {
446                 cli->cl_max_rpcs_in_flight = OBD_MAX_RIF_DEFAULT;
447         } else if (cfs_totalram_pages() >> (20 - PAGE_SHIFT) <= 128 /* MB */) {
448                 cli->cl_max_rpcs_in_flight = 2;
449         } else if (cfs_totalram_pages() >> (20 - PAGE_SHIFT) <= 256 /* MB */) {
450                 cli->cl_max_rpcs_in_flight = 3;
451         } else if (cfs_totalram_pages() >> (20 - PAGE_SHIFT) <= 512 /* MB */) {
452                 cli->cl_max_rpcs_in_flight = 4;
453         } else {
454                 if (osc_on_mdt(obd->obd_name))
455                         cli->cl_max_rpcs_in_flight = OBD_MAX_RIF_MAX;
456                 else
457                         cli->cl_max_rpcs_in_flight = OBD_MAX_RIF_DEFAULT;
458         }
459
460         spin_lock_init(&cli->cl_mod_rpcs_lock);
461         spin_lock_init(&cli->cl_mod_rpcs_hist.oh_lock);
462         cli->cl_max_mod_rpcs_in_flight = 0;
463         cli->cl_mod_rpcs_in_flight = 0;
464         cli->cl_close_rpcs_in_flight = 0;
465         init_waitqueue_head(&cli->cl_mod_rpcs_waitq);
466         cli->cl_mod_tag_bitmap = NULL;
467
468         INIT_LIST_HEAD(&cli->cl_chg_dev_linkage);
469
470         if (connect_op == MDS_CONNECT) {
471                 cli->cl_max_mod_rpcs_in_flight = cli->cl_max_rpcs_in_flight - 1;
472                 OBD_ALLOC(cli->cl_mod_tag_bitmap,
473                           BITS_TO_LONGS(OBD_MAX_RIF_MAX) * sizeof(long));
474                 if (cli->cl_mod_tag_bitmap == NULL)
475                         GOTO(err, rc = -ENOMEM);
476         }
477
478         rc = ldlm_get_ref();
479         if (rc) {
480                 CERROR("ldlm_get_ref failed: %d\n", rc);
481                 GOTO(err, rc);
482         }
483
484         ptlrpc_init_client(rq_portal, rp_portal, name,
485                            &obd->obd_ldlm_client);
486
487         imp = class_new_import(obd);
488         if (imp == NULL)
489                 GOTO(err_ldlm, rc = -ENOENT);
490         imp->imp_client = &obd->obd_ldlm_client;
491         imp->imp_connect_op = connect_op;
492         memcpy(cli->cl_target_uuid.uuid, lustre_cfg_buf(lcfg, 1),
493                LUSTRE_CFG_BUFLEN(lcfg, 1));
494         class_import_put(imp);
495
496         if (lustre_cfg_buf(lcfg, 4)) {
497                 __u32 refnet = libcfs_str2net(lustre_cfg_string(lcfg, 4));
498
499                 if (refnet == LNET_NIDNET(LNET_NID_ANY)) {
500                         rc = -EINVAL;
501                         CERROR("%s: bad mount option 'network=%s': rc = %d\n",
502                                obd->obd_name, lustre_cfg_string(lcfg, 4),
503                                rc);
504                         GOTO(err_import, rc);
505                 }
506                 fake_conn.c_self = LNET_MKNID(refnet, 0);
507                 imp->imp_connection = &fake_conn;
508         }
509
510         rc = client_import_add_conn(imp, &server_uuid, 1);
511         if (rc) {
512                 CERROR("can't add initial connection\n");
513                 GOTO(err_import, rc);
514         }
515         imp->imp_connection = NULL;
516
517         cli->cl_import = imp;
518         /* cli->cl_max_mds_easize updated by mdc_init_ea_size() */
519         cli->cl_max_mds_easize = sizeof(struct lov_mds_md_v3);
520
521         if (LUSTRE_CFG_BUFLEN(lcfg, 3) > 0) {
522                 if (!strcmp(lustre_cfg_string(lcfg, 3), "inactive")) {
523                         CDEBUG(D_HA, "marking %s %s->%s as inactive\n",
524                                name, obd->obd_name,
525                                cli->cl_target_uuid.uuid);
526                         spin_lock(&imp->imp_lock);
527                         imp->imp_deactive = 1;
528                         spin_unlock(&imp->imp_lock);
529                 }
530         }
531
532         obd->obd_namespace = ldlm_namespace_new(obd, obd->obd_name,
533                                                 LDLM_NAMESPACE_CLIENT,
534                                                 LDLM_NAMESPACE_GREEDY,
535                                                 ns_type);
536         if (obd->obd_namespace == NULL) {
537                 CERROR("Unable to create client namespace - %s\n",
538                        obd->obd_name);
539                 GOTO(err_import, rc = -ENOMEM);
540         }
541
542         RETURN(rc);
543
544 err_import:
545         class_destroy_import(imp);
546 err_ldlm:
547         ldlm_put_ref();
548 err:
549         if (cli->cl_mod_tag_bitmap != NULL)
550                 OBD_FREE(cli->cl_mod_tag_bitmap,
551                          BITS_TO_LONGS(OBD_MAX_RIF_MAX) * sizeof(long));
552         cli->cl_mod_tag_bitmap = NULL;
553         RETURN(rc);
554
555 }
556 EXPORT_SYMBOL(client_obd_setup);
557
558 int client_obd_cleanup(struct obd_device *obd)
559 {
560         struct client_obd *cli = &obd->u.cli;
561
562         ENTRY;
563
564         ldlm_namespace_free_post(obd->obd_namespace);
565         obd->obd_namespace = NULL;
566
567         obd_cleanup_client_import(obd);
568         LASSERT(obd->u.cli.cl_import == NULL);
569
570         ldlm_put_ref();
571
572         if (cli->cl_mod_tag_bitmap != NULL)
573                 OBD_FREE(cli->cl_mod_tag_bitmap,
574                          BITS_TO_LONGS(OBD_MAX_RIF_MAX) * sizeof(long));
575         cli->cl_mod_tag_bitmap = NULL;
576
577         RETURN(0);
578 }
579 EXPORT_SYMBOL(client_obd_cleanup);
580
581 /* ->o_connect() method for client side (OSC and MDC and MGC) */
582 int client_connect_import(const struct lu_env *env,
583                           struct obd_export **exp,
584                           struct obd_device *obd, struct obd_uuid *cluuid,
585                           struct obd_connect_data *data, void *localdata)
586 {
587         struct client_obd *cli = &obd->u.cli;
588         struct obd_import *imp = cli->cl_import;
589         struct obd_connect_data *ocd;
590         struct lustre_handle conn = { 0 };
591         int rc;
592
593         ENTRY;
594
595         *exp = NULL;
596         down_write(&cli->cl_sem);
597         if (cli->cl_conn_count > 0)
598                 GOTO(out_sem, rc = -EALREADY);
599
600         rc = class_connect(&conn, obd, cluuid);
601         if (rc)
602                 GOTO(out_sem, rc);
603
604         cli->cl_conn_count++;
605         *exp = class_conn2export(&conn);
606
607         LASSERT(obd->obd_namespace);
608
609         imp->imp_dlm_handle = conn;
610         rc = ptlrpc_init_import(imp);
611         if (rc != 0)
612                 GOTO(out_ldlm, rc);
613
614         ocd = &imp->imp_connect_data;
615         if (data) {
616                 *ocd = *data;
617                 imp->imp_connect_flags_orig = data->ocd_connect_flags;
618                 imp->imp_connect_flags2_orig = data->ocd_connect_flags2;
619         }
620
621         rc = ptlrpc_connect_import(imp);
622         if (rc != 0) {
623                 LASSERT(imp->imp_state == LUSTRE_IMP_DISCON);
624                 GOTO(out_ldlm, rc);
625         }
626         LASSERT(*exp != NULL && (*exp)->exp_connection);
627
628         if (data) {
629                 LASSERTF((ocd->ocd_connect_flags & data->ocd_connect_flags) ==
630                          ocd->ocd_connect_flags, "old %#llx, new %#llx\n",
631                          data->ocd_connect_flags, ocd->ocd_connect_flags);
632                 data->ocd_connect_flags = ocd->ocd_connect_flags;
633                 data->ocd_connect_flags2 = ocd->ocd_connect_flags2;
634         }
635
636         ptlrpc_pinger_add_import(imp);
637
638         EXIT;
639
640         if (rc) {
641 out_ldlm:
642                 cli->cl_conn_count--;
643                 class_disconnect(*exp);
644                 *exp = NULL;
645         }
646 out_sem:
647         up_write(&cli->cl_sem);
648
649         if (!rc && localdata) {
650                 LASSERT(cli->cl_cache == NULL); /* only once */
651                 cli->cl_cache = (struct cl_client_cache *)localdata;
652                 cl_cache_incref(cli->cl_cache);
653                 cli->cl_lru_left = &cli->cl_cache->ccc_lru_left;
654
655                 /* add this osc into entity list */
656                 LASSERT(list_empty(&cli->cl_lru_osc));
657                 spin_lock(&cli->cl_cache->ccc_lru_lock);
658                 list_add(&cli->cl_lru_osc, &cli->cl_cache->ccc_lru);
659                 spin_unlock(&cli->cl_cache->ccc_lru_lock);
660         }
661
662         return rc;
663 }
664 EXPORT_SYMBOL(client_connect_import);
665
666 int client_disconnect_export(struct obd_export *exp)
667 {
668         struct obd_device *obd = class_exp2obd(exp);
669         struct client_obd *cli;
670         struct obd_import *imp;
671         int rc = 0, err;
672
673         ENTRY;
674
675         if (!obd) {
676                 CERROR("invalid export for disconnect: exp %p cookie %#llx\n",
677                        exp, exp ? exp->exp_handle.h_cookie : -1);
678                 RETURN(-EINVAL);
679         }
680
681         cli = &obd->u.cli;
682         imp = cli->cl_import;
683
684         down_write(&cli->cl_sem);
685         CDEBUG(D_INFO, "disconnect %s - %zu\n", obd->obd_name,
686                 cli->cl_conn_count);
687
688         if (cli->cl_conn_count == 0) {
689                 CERROR("disconnecting disconnected device (%s)\n",
690                        obd->obd_name);
691                 GOTO(out_disconnect, rc = -EINVAL);
692         }
693
694         cli->cl_conn_count--;
695         if (cli->cl_conn_count != 0)
696                 GOTO(out_disconnect, rc = 0);
697
698         /*
699          * Mark import deactivated now, so we don't try to reconnect if any
700          * of the cleanup RPCs fails (e.g. LDLM cancel, etc).  We don't
701          * fully deactivate the import, or that would drop all requests.
702          */
703         spin_lock(&imp->imp_lock);
704         imp->imp_deactive = 1;
705         spin_unlock(&imp->imp_lock);
706
707         /*
708          * Some non-replayable imports (MDS's OSCs) are pinged, so just
709          * delete it regardless.  (It's safe to delete an import that was
710          * never added.)
711          */
712         (void)ptlrpc_pinger_del_import(imp);
713
714         if (obd->obd_namespace != NULL) {
715                 /* obd_force == local only */
716                 ldlm_cli_cancel_unused(obd->obd_namespace, NULL,
717                                        obd->obd_force ? LCF_LOCAL : 0, NULL);
718                 ldlm_namespace_free_prior(obd->obd_namespace, imp,
719                                           obd->obd_force);
720         }
721
722         /*
723          * There's no need to hold sem while disconnecting an import,
724          * and it may actually cause deadlock in GSS.
725          */
726         up_write(&cli->cl_sem);
727         rc = ptlrpc_disconnect_import(imp, 0);
728         down_write(&cli->cl_sem);
729
730         ptlrpc_invalidate_import(imp);
731
732         EXIT;
733
734 out_disconnect:
735         /*
736          * Use server style - class_disconnect should be always called for
737          * o_disconnect.
738          */
739         err = class_disconnect(exp);
740         if (!rc && err)
741                 rc = err;
742
743         up_write(&cli->cl_sem);
744
745         RETURN(rc);
746 }
747 EXPORT_SYMBOL(client_disconnect_export);
748
749 #ifdef HAVE_SERVER_SUPPORT
750 int server_disconnect_export(struct obd_export *exp)
751 {
752         int rc;
753
754         ENTRY;
755
756         /* Disconnect early so that clients can't keep using export. */
757         rc = class_disconnect(exp);
758         /* Close import to avoid sending any requests. */
759         if (exp->exp_imp_reverse)
760                 ptlrpc_cleanup_imp(exp->exp_imp_reverse);
761
762         ldlm_bl_thread_wakeup();
763
764         /* complete all outstanding replies */
765         spin_lock(&exp->exp_lock);
766         while (!list_empty(&exp->exp_outstanding_replies)) {
767                 struct ptlrpc_reply_state *rs =
768                         list_entry(exp->exp_outstanding_replies.next,
769                                        struct ptlrpc_reply_state, rs_exp_list);
770                 struct ptlrpc_service_part *svcpt = rs->rs_svcpt;
771
772                 spin_lock(&svcpt->scp_rep_lock);
773
774                 list_del_init(&rs->rs_exp_list);
775
776                 spin_lock(&rs->rs_lock);
777                 /* clear rs_convert_lock to make sure rs is handled and put */
778                 rs->rs_convert_lock = 0;
779                 ptlrpc_schedule_difficult_reply(rs);
780                 spin_unlock(&rs->rs_lock);
781
782                 spin_unlock(&svcpt->scp_rep_lock);
783         }
784         spin_unlock(&exp->exp_lock);
785
786         RETURN(rc);
787 }
788 EXPORT_SYMBOL(server_disconnect_export);
789
790 static inline int target_check_recovery_timer(struct obd_device *target)
791 {
792         ktime_t remaining;
793         s64 timeout;
794
795         if (!target->obd_recovering || target->obd_recovery_start == 0)
796                 return 0;
797
798         remaining = hrtimer_expires_remaining(&target->obd_recovery_timer);
799         timeout = ktime_divns(remaining, NSEC_PER_SEC);
800         if (timeout > -30)
801                 return 0;
802
803         /* the recovery timer should expire, but it isn't triggered,
804          * it's better to abort the recovery of this target to speed up
805          * the recovery of the whole cluster. */
806         spin_lock(&target->obd_dev_lock);
807         if (target->obd_recovering) {
808                 CERROR("%s: Aborting recovery\n", target->obd_name);
809                 target->obd_abort_recovery = 1;
810                 wake_up(&target->obd_next_transno_waitq);
811         }
812         spin_unlock(&target->obd_dev_lock);
813         return 0;
814 }
815
816 /*
817  * --------------------------------------------------------------------------
818  * from old lib/target.c
819  * --------------------------------------------------------------------------
820  */
821 static int target_handle_reconnect(struct lustre_handle *conn,
822                                    struct obd_export *exp,
823                                    struct obd_uuid *cluuid)
824 {
825         struct obd_device *target;
826         struct lustre_handle *hdl;
827         ktime_t remaining;
828         s64 timeout;
829         int rc = 0;
830
831         ENTRY;
832         hdl = &exp->exp_imp_reverse->imp_remote_handle;
833         if (!exp->exp_connection || !lustre_handle_is_used(hdl)) {
834                 conn->cookie = exp->exp_handle.h_cookie;
835                 CDEBUG(D_HA,
836                        "connect export for UUID '%s' at %p, cookie %#llx\n",
837                        cluuid->uuid, exp, conn->cookie);
838                 RETURN(0);
839         }
840
841         target = exp->exp_obd;
842
843         /* Might be a re-connect after a partition. */
844         if (memcmp(&conn->cookie, &hdl->cookie, sizeof(conn->cookie))) {
845                 LCONSOLE_WARN("%s: already connected client %s (at %s) with handle %#llx. Rejecting client with the same UUID trying to reconnect with handle %#llx\n",
846                               target->obd_name,
847                               obd_uuid2str(&exp->exp_client_uuid),
848                               obd_export_nid2str(exp),
849                               hdl->cookie, conn->cookie);
850                 memset(conn, 0, sizeof(*conn));
851                 /*
852                  * target_handle_connect() treats EALREADY and
853                  * -EALREADY differently.  -EALREADY is an error
854                  * (same UUID, different handle).
855                  */
856                 RETURN(-EALREADY);
857         }
858
859         if (!target->obd_recovering) {
860                 LCONSOLE_WARN("%s: Client %s (at %s) reconnecting\n",
861                         target->obd_name, obd_uuid2str(&exp->exp_client_uuid),
862                         obd_export_nid2str(exp));
863                 GOTO(out_already, rc);
864         }
865
866         remaining = hrtimer_expires_remaining(&target->obd_recovery_timer);
867         timeout = ktime_divns(remaining, NSEC_PER_SEC);
868         if (timeout > 0) {
869                 LCONSOLE_WARN("%s: Client %s (at %s) reconnected, waiting for %d clients in recovery for %lld:%.02lld\n",
870                               target->obd_name,
871                               obd_uuid2str(&exp->exp_client_uuid),
872                               obd_export_nid2str(exp),
873                               atomic_read(&target->obd_max_recoverable_clients),
874                               timeout / 60, timeout % 60);
875         } else {
876                 struct target_distribute_txn_data *tdtd;
877                 int size = 0;
878                 int count = 0;
879                 char *buf = NULL;
880
881                 target_check_recovery_timer(target);
882
883                 tdtd = class_exp2tgt(exp)->lut_tdtd;
884                 if (tdtd && tdtd->tdtd_show_update_logs_retrievers)
885                         buf = tdtd->tdtd_show_update_logs_retrievers(
886                                 tdtd->tdtd_show_retrievers_cbdata,
887                                 &size, &count);
888
889                 if (count > 0)
890                         LCONSOLE_WARN("%s: Client %s (at %s) reconnecting, waiting for %d MDTs (%s) in recovery for %lld:%.02lld. Please wait until all MDTs recovered or you may force MDT evicition via 'lctl --device %s abort_recovery.\n",
891                                       target->obd_name,
892                                       obd_uuid2str(&exp->exp_client_uuid),
893                                       obd_export_nid2str(exp), count,
894                                       buf ? buf : "unknown (not enough RAM)",
895                                       (abs(timeout) + target->obd_recovery_timeout) / 60,
896                                       (abs(timeout) + target->obd_recovery_timeout) % 60,
897                                       target->obd_name);
898                 else
899                         LCONSOLE_WARN("%s: Recovery already passed deadline %lld:%.02lld. If you do not want to wait more, you may force taget eviction via 'lctl --device %s abort_recovery.\n",
900                                       target->obd_name, abs(timeout) / 60,
901                                       abs(timeout) % 60, target->obd_name);
902
903                 if (buf != NULL)
904                         OBD_FREE(buf, size);
905         }
906
907 out_already:
908         conn->cookie = exp->exp_handle.h_cookie;
909         /*
910          * target_handle_connect() treats EALREADY and
911          * -EALREADY differently.  EALREADY means we are
912          * doing a valid reconnect from the same client.
913          */
914         RETURN(EALREADY);
915 }
916
917 static void
918 check_and_start_recovery_timer(struct obd_device *obd,
919                                struct ptlrpc_request *req, int new_client);
920
921 /**
922  * update flags for import during reconnect process
923  */
924 static int rev_import_flags_update(struct obd_import *revimp,
925                                    struct ptlrpc_request *req)
926 {
927         int rc;
928         struct obd_connect_data *data;
929
930         data = req_capsule_client_get(&req->rq_pill, &RMF_CONNECT_DATA);
931
932         if (data->ocd_connect_flags & OBD_CONNECT_AT)
933                 revimp->imp_msghdr_flags |= MSGHDR_AT_SUPPORT;
934         else
935                 revimp->imp_msghdr_flags &= ~MSGHDR_AT_SUPPORT;
936
937         revimp->imp_msghdr_flags |= MSGHDR_CKSUM_INCOMPAT18;
938
939         rc = sptlrpc_import_sec_adapt(revimp, req->rq_svc_ctx, &req->rq_flvr);
940         if (rc) {
941                 CERROR("%s: cannot get reverse import %s security: rc = %d\n",
942                         revimp->imp_client->cli_name,
943                         libcfs_id2str(req->rq_peer), rc);
944                 return rc;
945         }
946
947         return 0;
948 }
949
950 /**
951  * Allocate a new reverse import for an export.
952  *
953  * \retval -errno in case error hit
954  * \retval 0 if reverse import correctly init
955  **/
956 int rev_import_init(struct obd_export *export)
957 {
958         struct obd_device *obd = export->exp_obd;
959         struct obd_import *revimp;
960
961         LASSERT(export->exp_imp_reverse == NULL);
962
963         revimp = class_new_import(obd);
964         if (revimp == NULL)
965                 return -ENOMEM;
966
967         revimp->imp_remote_handle.cookie = 0ULL;
968         revimp->imp_client = &obd->obd_ldlm_client;
969         revimp->imp_dlm_fake = 1;
970
971         /* it is safe to connect import in new state as no sends possible */
972         spin_lock(&export->exp_lock);
973         export->exp_imp_reverse = revimp;
974         spin_unlock(&export->exp_lock);
975         class_import_put(revimp);
976
977         return 0;
978 }
979 EXPORT_SYMBOL(rev_import_init);
980
981 /**
982  * Handle reconnect for an export.
983  *
984  * \param exp export to handle reconnect process
985  * \param req client reconnect request
986  *
987  * \retval -rc in case securitfy flavor can't be changed
988  * \retval 0 in case none problems
989  */
990 static int rev_import_reconnect(struct obd_export *exp,
991                                 struct ptlrpc_request *req)
992 {
993         struct obd_import *revimp = exp->exp_imp_reverse;
994         struct lustre_handle *lh;
995         int rc;
996
997         /* avoid sending a request until import flags are changed */
998         ptlrpc_import_enter_resend(revimp);
999
1000         if (revimp->imp_connection != NULL)
1001                 ptlrpc_connection_put(revimp->imp_connection);
1002
1003         /*
1004          * client from recovery don't have a handle so we need to take from
1005          * request. it may produce situation when wrong client connected
1006          * to recovery as we trust a client uuid
1007          */
1008         lh = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
1009         revimp->imp_remote_handle = *lh;
1010
1011         /*
1012          * unknown versions will be caught in
1013          * ptlrpc_handle_server_req_in->lustre_unpack_msg()
1014          */
1015         revimp->imp_msg_magic = req->rq_reqmsg->lm_magic;
1016
1017         revimp->imp_connection = ptlrpc_connection_addref(exp->exp_connection);
1018
1019         rc = rev_import_flags_update(revimp, req);
1020         if (rc != 0) {
1021                 /*
1022                  * it is safe to still be in RECOVERY phase as we are not able
1023                  * to setup correct security flavor so requests are not able to
1024                  * be delivered correctly
1025                  */
1026                 return rc;
1027         }
1028
1029         /* resend all rpc's via new connection */
1030         return ptlrpc_import_recovery_state_machine(revimp);
1031 }
1032
1033 int target_handle_connect(struct ptlrpc_request *req)
1034 {
1035         struct obd_device *target = NULL;
1036         struct obd_export *export = NULL;
1037         /*
1038          * connect handle - filled from target_handle_reconnect in
1039          * reconnect case
1040          */
1041         struct lustre_handle conn;
1042         struct lustre_handle *tmp;
1043         struct obd_uuid cluuid;
1044         char *str;
1045         int rc = 0;
1046         char *target_start;
1047         int target_len;
1048         bool mds_conn = false, lw_client = false, initial_conn = false;
1049         bool mds_mds_conn = false;
1050         bool new_mds_mds_conn = false;
1051         struct obd_connect_data *data, *tmpdata;
1052         int size, tmpsize;
1053         lnet_nid_t *client_nid = NULL;
1054
1055         ENTRY;
1056
1057         OBD_RACE(OBD_FAIL_TGT_CONN_RACE);
1058
1059         str = req_capsule_client_get(&req->rq_pill, &RMF_TGTUUID);
1060         if (str == NULL) {
1061                 DEBUG_REQ(D_ERROR, req, "bad target UUID for connect");
1062                 GOTO(out, rc = -EINVAL);
1063         }
1064
1065         target = class_dev_by_str(str);
1066         if (!target) {
1067                 deuuidify(str, NULL, &target_start, &target_len);
1068                 LCONSOLE_ERROR_MSG(0x137,
1069                                    "%s: not available for connect from %s (no target). If you are running an HA pair check that the target is mounted on the other server.\n",
1070                                    str, libcfs_nid2str(req->rq_peer.nid));
1071                 GOTO(out, rc = -ENODEV);
1072         }
1073
1074         spin_lock(&target->obd_dev_lock);
1075
1076         target->obd_conn_inprogress++;
1077
1078         if (target->obd_stopping || !target->obd_set_up) {
1079                 spin_unlock(&target->obd_dev_lock);
1080
1081                 deuuidify(str, NULL, &target_start, &target_len);
1082                 LCONSOLE_INFO("%.*s: Not available for connect from %s (%s)\n",
1083                               target_len, target_start,
1084                               libcfs_nid2str(req->rq_peer.nid),
1085                               (target->obd_stopping ?
1086                                "stopping" : "not set up"));
1087                 GOTO(out, rc = -ENODEV);
1088         }
1089
1090         if (target->obd_no_conn) {
1091                 spin_unlock(&target->obd_dev_lock);
1092
1093                 CDEBUG(D_INFO,
1094                        "%s: Temporarily refusing client connection from %s\n",
1095                        target->obd_name, libcfs_nid2str(req->rq_peer.nid));
1096                 GOTO(out, rc = -EAGAIN);
1097         }
1098
1099         spin_unlock(&target->obd_dev_lock);
1100
1101         str = req_capsule_client_get(&req->rq_pill, &RMF_CLUUID);
1102         if (str == NULL) {
1103                 DEBUG_REQ(D_ERROR, req, "bad client UUID for connect");
1104                 GOTO(out, rc = -EINVAL);
1105         }
1106
1107         obd_str2uuid(&cluuid, str);
1108
1109         tmp = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
1110         if (tmp == NULL)
1111                 GOTO(out, rc = -EPROTO);
1112
1113         conn = *tmp;
1114
1115         size = req_capsule_get_size(&req->rq_pill, &RMF_CONNECT_DATA,
1116                                     RCL_CLIENT);
1117         if (size < 0 || size > 8 * sizeof(struct obd_connect_data))
1118                 GOTO(out, rc = -EPROTO);
1119         data = req_capsule_client_get(&req->rq_pill, &RMF_CONNECT_DATA);
1120         if (!data)
1121                 GOTO(out, rc = -EPROTO);
1122
1123         rc = req_capsule_server_pack(&req->rq_pill);
1124         if (rc)
1125                 GOTO(out, rc);
1126
1127 #if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(3, 0, 53, 0)
1128         /*
1129          * Don't allow clients to connect that are using old 1.8 format
1130          * protocol conventions (LUSTRE_MSG_MAGIC_v1, !MSGHDR_CKSUM_INCOMPAT18,
1131          * ldlm_flock_policy_wire format, MDT_ATTR_xTIME_SET, etc).  The
1132          * FULL20 flag should be set on all connections since 2.0, but no
1133          * longer affects behaviour.
1134          *
1135          * Later this check will be disabled and the flag can be retired
1136          * completely once interop with 3.0 is no longer needed.
1137          */
1138         if (!(data->ocd_connect_flags & OBD_CONNECT_FULL20))
1139                 GOTO(out, rc = -EPROTO);
1140
1141         /*
1142          * Don't allow liblustre clients to connect.
1143          * - testing was disabled in v2_2_50_0-61-g6a75d65
1144          * - building was disabled in v2_5_58_0-28-g7277179
1145          * - client code was deleted in v2_6_50_0-101-gcdfbc72,
1146          * - clients were refused connect for version difference > 0.0.1.32
1147          */
1148         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
1149                 DEBUG_REQ(D_WARNING, req, "Refusing libclient connection");
1150                 GOTO(out, rc = -EPROTO);
1151         }
1152 #endif
1153
1154         /*
1155          * Note: lw_client is needed in MDS-MDS failover during update log
1156          * processing, so we needs to allow lw_client to be connected at
1157          * anytime, instead of only the initial connection
1158          */
1159         lw_client = (data->ocd_connect_flags & OBD_CONNECT_LIGHTWEIGHT) != 0;
1160
1161         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_INITIAL) {
1162                 initial_conn = true;
1163                 mds_conn = (data->ocd_connect_flags & OBD_CONNECT_MDS) != 0;
1164                 mds_mds_conn = (data->ocd_connect_flags &
1165                                 OBD_CONNECT_MDS_MDS) != 0;
1166
1167                 /*
1168                  * OBD_CONNECT_MNE_SWAB is removed at 2.14
1169                  * Checking OBD_CONNECT_FID can be removed in the future.
1170                  *
1171                  * Via check OBD_CONNECT_FID, we can distinguish whether
1172                  * the OBD_CONNECT_MDS_MDS/OBD_CONNECT_MNE_SWAB is from
1173                  * MGC or MDT, since MGC does not use OBD_CONNECT_FID.
1174                  */
1175                 if (!lw_client &&
1176                     (data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) &&
1177                     (data->ocd_connect_flags & OBD_CONNECT_FID) &&
1178                     (data->ocd_connect_flags & OBD_CONNECT_VERSION)) {
1179                         __u32 major = OBD_OCD_VERSION_MAJOR(data->ocd_version);
1180                         __u32 minor = OBD_OCD_VERSION_MINOR(data->ocd_version);
1181                         __u32 patch = OBD_OCD_VERSION_PATCH(data->ocd_version);
1182
1183                         /*
1184                          * We do not support the MDT-MDT interoperations with
1185                          * different version MDT because of protocol changes.
1186                          */
1187                         if (unlikely(major != LUSTRE_MAJOR ||
1188                                      minor != LUSTRE_MINOR ||
1189                                      abs(patch - LUSTRE_PATCH) > 3)) {
1190                                 LCONSOLE_WARN("%s (%u.%u.%u.%u) refused the connection from different version MDT (%d.%d.%d.%d) %s %s\n",
1191                                               target->obd_name, LUSTRE_MAJOR,
1192                                               LUSTRE_MINOR, LUSTRE_PATCH,
1193                                               LUSTRE_FIX, major, minor, patch,
1194                                               OBD_OCD_VERSION_FIX(data->ocd_version),
1195                                               libcfs_nid2str(req->rq_peer.nid),
1196                                               str);
1197                                 GOTO(out, rc = -EPROTO);
1198                         }
1199                 }
1200         }
1201
1202         /* lctl gets a backstage, all-access pass. */
1203         if (obd_uuid_equals(&cluuid, &target->obd_uuid))
1204                 goto dont_check_exports;
1205
1206         export = obd_uuid_lookup(target, &cluuid);
1207         if (!export)
1208                 goto no_export;
1209
1210         /* We've found an export in the hash. */
1211
1212         spin_lock(&export->exp_lock);
1213
1214         if (export->exp_connecting) { /* b=9635, et. al. */
1215                 spin_unlock(&export->exp_lock);
1216                 LCONSOLE_WARN("%s: Export %p already connecting from %s\n",
1217                               export->exp_obd->obd_name, export,
1218                               libcfs_nid2str(req->rq_peer.nid));
1219                 class_export_put(export);
1220                 export = NULL;
1221                 rc = -EALREADY;
1222         } else if ((mds_conn || (lw_client && initial_conn) ||
1223                    data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) &&
1224                    export->exp_connection != NULL) {
1225                 spin_unlock(&export->exp_lock);
1226                 if (req->rq_peer.nid != export->exp_connection->c_peer.nid) {
1227                         /* MDS or LWP reconnected after failover. */
1228                         LCONSOLE_WARN("%s: Received %s connection from %s, removing former export from %s\n",
1229                                       target->obd_name,
1230                                       mds_conn ? "MDS" : "LWP",
1231                                       libcfs_nid2str(req->rq_peer.nid),
1232                                       libcfs_nid2str(export->exp_connection->c_peer.nid));
1233                 } else {
1234                         /* New MDS connection from the same NID. */
1235                         LCONSOLE_WARN("%s: Received new %s connection from %s, removing former export from same NID\n",
1236                                       target->obd_name,
1237                                       mds_conn ? "MDS" : "LWP",
1238                                       libcfs_nid2str(req->rq_peer.nid));
1239                 }
1240
1241                 if (req->rq_peer.nid == export->exp_connection->c_peer.nid &&
1242                     data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) {
1243                         /*
1244                          * Because exports between MDTs will always be
1245                          * kept, let's do not fail such export if they
1246                          * come from the same NID, otherwise it might
1247                          * cause eviction between MDTs, which might
1248                          * cause namespace inconsistency
1249                          */
1250                         spin_lock(&export->exp_lock);
1251                         export->exp_connecting = 1;
1252                         export->exp_conn_cnt = 0;
1253                         spin_unlock(&export->exp_lock);
1254                         conn.cookie = export->exp_handle.h_cookie;
1255                         rc = EALREADY;
1256                 } else {
1257                         class_fail_export(export);
1258                         class_export_put(export);
1259                         export = NULL;
1260                         rc = 0;
1261                 }
1262         } else if (export->exp_connection != NULL && initial_conn &&
1263                    req->rq_peer.nid != export->exp_connection->c_peer.nid) {
1264                 spin_unlock(&export->exp_lock);
1265                 /* In MDS failover we have static UUID but NID can change. */
1266                 LCONSOLE_WARN("%s: Client %s seen on new nid %s when existing nid %s is already connected\n",
1267                               target->obd_name, cluuid.uuid,
1268                               libcfs_nid2str(req->rq_peer.nid),
1269                               libcfs_nid2str(
1270                                         export->exp_connection->c_peer.nid));
1271                 rc = -EALREADY;
1272                 class_export_put(export);
1273                 export = NULL;
1274         } else if (OBD_FAIL_PRECHECK(OBD_FAIL_TGT_RECOVERY_CONNECT) &&
1275                    !lw_client) {
1276                 spin_unlock(&export->exp_lock);
1277                 rc = -EAGAIN;
1278         } else {
1279                 export->exp_connecting = 1;
1280                 spin_unlock(&export->exp_lock);
1281                 LASSERT(export->exp_obd == target);
1282
1283                 rc = target_handle_reconnect(&conn, export, &cluuid);
1284         }
1285
1286         /* If we found an export, we already unlocked. */
1287         if (!export) {
1288 no_export:
1289                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_CONNECT, 2 * obd_timeout);
1290         } else if (req->rq_export == NULL &&
1291                    atomic_read(&export->exp_rpc_count) > 0) {
1292                 LCONSOLE_WARN("%s: Client %s (at %s) refused connection, still busy with %d references\n",
1293                               target->obd_name, cluuid.uuid,
1294                               libcfs_nid2str(req->rq_peer.nid),
1295                               refcount_read(&export->exp_handle.h_ref));
1296                         GOTO(out, rc = -EBUSY);
1297         } else if (lustre_msg_get_conn_cnt(req->rq_reqmsg) == 1 &&
1298                    rc != EALREADY) {
1299                 if (!strstr(cluuid.uuid, "mdt"))
1300                         LCONSOLE_WARN("%s: Rejecting reconnect from the known client %s (at %s) because it is indicating it is a new client",
1301                                       target->obd_name, cluuid.uuid,
1302                                       libcfs_nid2str(req->rq_peer.nid));
1303                 GOTO(out, rc = -EALREADY);
1304         } else {
1305                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_RECONNECT, 2 * obd_timeout);
1306         }
1307
1308         if (rc < 0)
1309                 GOTO(out, rc);
1310
1311         CDEBUG(D_HA, "%s: connection from %s@%s %st%llu exp %p cur %lld last %lld\n",
1312                target->obd_name, cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
1313                target->obd_recovering ? "recovering/" : "", data->ocd_transno,
1314                export, ktime_get_seconds(),
1315                export ? export->exp_last_request_time : 0);
1316
1317         /*
1318          * If this is the first time a client connects, reset the recovery
1319          * timer. Discard lightweight connections which might be local.
1320          */
1321         if (!lw_client && rc == 0 && target->obd_recovering)
1322                 check_and_start_recovery_timer(target, req, export == NULL);
1323
1324         /*
1325          * We want to handle EALREADY but *not* -EALREADY from
1326          * target_handle_reconnect(), return reconnection state in a flag.
1327          */
1328         if (rc == EALREADY) {
1329                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECONNECT);
1330                 rc = 0;
1331         } else {
1332                 LASSERT(rc == 0);
1333         }
1334
1335         /* Tell the client if we support replayable requests. */
1336         if (target->obd_replayable)
1337                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_REPLAYABLE);
1338         client_nid = &req->rq_peer.nid;
1339
1340         if (export == NULL) {
1341                 /* allow lightweight connections during recovery */
1342                 /*
1343                  * allow "new" MDT to be connected during recovery, since we
1344                  * need retrieve recovery update records from it
1345                  */
1346                 if (target->obd_recovering && !lw_client && !mds_mds_conn) {
1347                         struct hrtimer *timer = &target->obd_recovery_timer;
1348                         ktime_t remaining;
1349                         s64 timeout, left;
1350                         int in_progress;
1351                         int connected;
1352                         int known;
1353                         int stale;
1354                         char *msg;
1355
1356                         connected = atomic_read(&target->obd_connected_clients);
1357                         in_progress = atomic_read(&target->obd_lock_replay_clients);
1358                         known =
1359                            atomic_read(&target->obd_max_recoverable_clients);
1360                         stale = target->obd_stale_clients;
1361                         remaining = hrtimer_expires_remaining(timer);
1362                         left = ktime_divns(remaining, NSEC_PER_SEC);
1363
1364                         if (ktime_to_ns(remaining) > 0) {
1365                                 msg = "to recover in";
1366                                 timeout = left;
1367                         } else {
1368                                 msg = "already passed deadline";
1369                                 timeout = -left;
1370
1371                                 target_check_recovery_timer(target);
1372                         }
1373
1374                         LCONSOLE_WARN("%s: Denying connection for new client %s (at %s), waiting for %d known clients (%d recovered, %d in progress, and %d evicted) %s %lld:%.02lld\n",
1375                                       target->obd_name, cluuid.uuid,
1376                                       libcfs_nid2str(req->rq_peer.nid), known,
1377                                       connected - in_progress, in_progress,
1378                                       stale, msg, timeout / 60, timeout % 60);
1379                         rc = -EBUSY;
1380                 } else {
1381 dont_check_exports:
1382                         rc = obd_connect(req->rq_svc_thread->t_env,
1383                                          &export, target, &cluuid, data,
1384                                          client_nid);
1385                         if (mds_conn && OBD_FAIL_CHECK(OBD_FAIL_TGT_RCVG_FLAG))
1386                                 lustre_msg_add_op_flags(req->rq_repmsg,
1387                                                         MSG_CONNECT_RECOVERING);
1388                         if (rc == 0) {
1389                                 conn.cookie = export->exp_handle.h_cookie;
1390                                 rc = rev_import_init(export);
1391                         }
1392
1393                         if (mds_mds_conn)
1394                                 new_mds_mds_conn = true;
1395                 }
1396         } else {
1397                 rc = obd_reconnect(req->rq_svc_thread->t_env,
1398                                    export, target, &cluuid, data, client_nid);
1399         }
1400         if (rc)
1401                 GOTO(out, rc);
1402
1403         LASSERT(target->u.obt.obt_magic == OBT_MAGIC);
1404         data->ocd_instance = target->u.obt.obt_instance;
1405
1406         /*
1407          * Return only the parts of obd_connect_data that we understand, so the
1408          * client knows that we don't understand the rest.
1409          */
1410         if (data) {
1411                 tmpsize = req_capsule_get_size(&req->rq_pill, &RMF_CONNECT_DATA,
1412                                                RCL_SERVER);
1413                 tmpdata = req_capsule_server_get(&req->rq_pill,
1414                                                  &RMF_CONNECT_DATA);
1415                 /*
1416                  * Don't use struct assignment here, because the client reply
1417                  * buffer may be smaller/larger than the local struct
1418                  * obd_connect_data.
1419                  */
1420                 memcpy(tmpdata, data, min(tmpsize, size));
1421         }
1422
1423         /*
1424          * If the client and the server are the same node, we will already
1425          * have an export that really points to the client's DLM export,
1426          * because we have a shared handles table.
1427          *
1428          * XXX this will go away when shaver stops sending the "connect" handle
1429          * in the real "remote handle" field of the request --phik 24 Apr 2003
1430          */
1431         ptlrpc_request_change_export(req, export);
1432
1433         spin_lock(&export->exp_lock);
1434         if (export->exp_conn_cnt >= lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
1435                 spin_unlock(&export->exp_lock);
1436                 CDEBUG(D_RPCTRACE,
1437                        "%s: %s already connected at greater or equal conn_cnt: %d >= %d\n",
1438                        cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
1439                        export->exp_conn_cnt,
1440                        lustre_msg_get_conn_cnt(req->rq_reqmsg));
1441
1442                 GOTO(out, rc = -EALREADY);
1443         }
1444         LASSERT(lustre_msg_get_conn_cnt(req->rq_reqmsg) > 0);
1445         export->exp_conn_cnt = lustre_msg_get_conn_cnt(req->rq_reqmsg);
1446         spin_unlock(&export->exp_lock);
1447
1448         if (export->exp_connection != NULL) {
1449                 /* Check to see if connection came from another NID. */
1450                 if (export->exp_connection->c_peer.nid != req->rq_peer.nid)
1451                         obd_nid_del(export->exp_obd, export);
1452
1453                 ptlrpc_connection_put(export->exp_connection);
1454         }
1455
1456         export->exp_connection = ptlrpc_connection_get(req->rq_peer,
1457                                                        req->rq_self,
1458                                                        &cluuid);
1459         if (!export->exp_connection)
1460                 GOTO(out, rc = -ENOTCONN);
1461
1462         obd_nid_add(export->exp_obd, export);
1463
1464         lustre_msg_set_handle(req->rq_repmsg, &conn);
1465
1466         rc = rev_import_reconnect(export, req);
1467         if (rc != 0)
1468                 GOTO(out, rc);
1469
1470         if (target->obd_recovering && !export->exp_in_recovery && !lw_client) {
1471                 int has_transno;
1472                 __u64 transno = data->ocd_transno;
1473
1474                 spin_lock(&export->exp_lock);
1475                 /*
1476                  * possible race with class_disconnect_stale_exports,
1477                  * export may be already in the eviction process
1478                  */
1479                 if (export->exp_failed) {
1480                         spin_unlock(&export->exp_lock);
1481                         GOTO(out, rc = -ENODEV);
1482                 }
1483                 export->exp_in_recovery = 1;
1484                 export->exp_req_replay_needed = 1;
1485                 export->exp_lock_replay_needed = 1;
1486                 spin_unlock(&export->exp_lock);
1487
1488                 has_transno = !!(lustre_msg_get_op_flags(req->rq_reqmsg) &
1489                                  MSG_CONNECT_TRANSNO);
1490                 if (has_transno && transno == 0)
1491                         CWARN("Connect with zero transno!\n");
1492
1493                 if (has_transno && transno > 0 &&
1494                     transno < target->obd_next_recovery_transno &&
1495                     transno > target->obd_last_committed) {
1496                         /* Another way is to use cmpxchg() to be lock-free. */
1497                         spin_lock(&target->obd_recovery_task_lock);
1498                         if (transno < target->obd_next_recovery_transno)
1499                                 target->obd_next_recovery_transno = transno;
1500                         spin_unlock(&target->obd_recovery_task_lock);
1501                 }
1502
1503                 atomic_inc(&target->obd_req_replay_clients);
1504                 atomic_inc(&target->obd_lock_replay_clients);
1505                 /*
1506                  * Note: MDS-MDS connection is allowed to be connected during
1507                  * recovery, no matter if the exports needs to be recoveried.
1508                  * Because we need retrieve updates logs from all other MDTs.
1509                  * So if the MDS-MDS export is new, obd_max_recoverable_clients
1510                  * also needs to be increased to match other recovery checking
1511                  * condition.
1512                  */
1513                 if (new_mds_mds_conn)
1514                         atomic_inc(&target->obd_max_recoverable_clients);
1515
1516                 if (atomic_inc_return(&target->obd_connected_clients) ==
1517                     atomic_read(&target->obd_max_recoverable_clients))
1518                         wake_up(&target->obd_next_transno_waitq);
1519         }
1520
1521         /* Tell the client we're in recovery, when client is involved in it. */
1522         if (target->obd_recovering && !lw_client)
1523                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECOVERING);
1524
1525 out:
1526         if (export) {
1527                 spin_lock(&export->exp_lock);
1528                 export->exp_connecting = 0;
1529                 spin_unlock(&export->exp_lock);
1530
1531                 class_export_put(export);
1532         }
1533         if (target != NULL) {
1534                 spin_lock(&target->obd_dev_lock);
1535                 target->obd_conn_inprogress--;
1536                 spin_unlock(&target->obd_dev_lock);
1537                 class_decref(target, "find", current);
1538         }
1539         req->rq_status = rc;
1540         RETURN(rc);
1541 }
1542
1543 int target_handle_disconnect(struct ptlrpc_request *req)
1544 {
1545         int rc;
1546
1547         ENTRY;
1548
1549         rc = req_capsule_server_pack(&req->rq_pill);
1550         if (rc)
1551                 RETURN(rc);
1552
1553         /* Keep the rq_export around so we can send the reply. */
1554         req->rq_status = obd_disconnect(class_export_get(req->rq_export));
1555
1556         RETURN(0);
1557 }
1558
1559 void target_destroy_export(struct obd_export *exp)
1560 {
1561         struct obd_import *imp = NULL;
1562         /*
1563          * exports created from last_rcvd data, and "fake"
1564          * exports created by lctl don't have an import
1565          */
1566         spin_lock(&exp->exp_lock);
1567         if (exp->exp_imp_reverse != NULL) {
1568                 imp = exp->exp_imp_reverse;
1569                 exp->exp_imp_reverse = NULL;
1570         }
1571         spin_unlock(&exp->exp_lock);
1572         if (imp != NULL)
1573                 client_destroy_import(imp);
1574
1575         LASSERT_ATOMIC_ZERO(&exp->exp_locks_count);
1576         LASSERT_ATOMIC_ZERO(&exp->exp_rpc_count);
1577         LASSERT_ATOMIC_ZERO(&exp->exp_cb_count);
1578         LASSERT_ATOMIC_ZERO(&exp->exp_replay_count);
1579 }
1580 EXPORT_SYMBOL(target_destroy_export);
1581
1582 /*
1583  * Recovery functions
1584  */
1585 static void target_request_copy_get(struct ptlrpc_request *req)
1586 {
1587         class_export_rpc_inc(req->rq_export);
1588         LASSERT(list_empty(&req->rq_list));
1589         INIT_LIST_HEAD(&req->rq_replay_list);
1590
1591         /* Increase refcount to keep request in queue. */
1592         atomic_inc(&req->rq_refcount);
1593         /* Let export know it has replays to be handled. */
1594         atomic_inc(&req->rq_export->exp_replay_count);
1595 }
1596
1597 static void target_request_copy_put(struct ptlrpc_request *req)
1598 {
1599         LASSERT(list_empty(&req->rq_replay_list));
1600         LASSERT_ATOMIC_POS(&req->rq_export->exp_replay_count);
1601
1602         atomic_dec(&req->rq_export->exp_replay_count);
1603         class_export_rpc_dec(req->rq_export);
1604         ptlrpc_server_drop_request(req);
1605 }
1606
1607 static int target_exp_enqueue_req_replay(struct ptlrpc_request *req)
1608 {
1609         __u64 transno = lustre_msg_get_transno(req->rq_reqmsg);
1610         struct obd_export *exp = req->rq_export;
1611         struct ptlrpc_request *reqiter;
1612         struct ptlrpc_request *dup_req = NULL;
1613         int dup = 0;
1614
1615         LASSERT(exp);
1616
1617         spin_lock(&exp->exp_lock);
1618         list_for_each_entry(reqiter, &exp->exp_req_replay_queue,
1619                             rq_replay_list) {
1620                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) == transno) {
1621                         dup_req = reqiter;
1622                         dup = 1;
1623                         break;
1624                 }
1625         }
1626
1627         if (dup) {
1628                 /* We expect it with RESENT and REPLAY flags. */
1629                 if ((lustre_msg_get_flags(req->rq_reqmsg) &
1630                     (MSG_RESENT | MSG_REPLAY)) != (MSG_RESENT | MSG_REPLAY))
1631                         CERROR("invalid flags %x of resent replay\n",
1632                                lustre_msg_get_flags(req->rq_reqmsg));
1633
1634                 if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY) {
1635                         __u32 new_conn;
1636
1637                         new_conn = lustre_msg_get_conn_cnt(req->rq_reqmsg);
1638                         if (new_conn >
1639                             lustre_msg_get_conn_cnt(dup_req->rq_reqmsg))
1640                                 lustre_msg_set_conn_cnt(dup_req->rq_reqmsg,
1641                                                         new_conn);
1642                 }
1643         } else {
1644                 list_add_tail(&req->rq_replay_list,
1645                               &exp->exp_req_replay_queue);
1646         }
1647
1648         spin_unlock(&exp->exp_lock);
1649         return dup;
1650 }
1651
1652 static void target_exp_dequeue_req_replay(struct ptlrpc_request *req)
1653 {
1654         LASSERT(!list_empty(&req->rq_replay_list));
1655         LASSERT(req->rq_export);
1656
1657         spin_lock(&req->rq_export->exp_lock);
1658         list_del_init(&req->rq_replay_list);
1659         spin_unlock(&req->rq_export->exp_lock);
1660 }
1661
1662 static void target_finish_recovery(struct lu_target *lut)
1663 {
1664         struct obd_device *obd = lut->lut_obd;
1665
1666         ENTRY;
1667
1668         /* Only log a recovery message when recovery has occurred. */
1669         if (obd->obd_recovery_start) {
1670                 time64_t now = ktime_get_seconds();
1671                 time64_t elapsed_time;
1672
1673                 elapsed_time = max_t(time64_t, now - obd->obd_recovery_start,
1674                                      1);
1675                 LCONSOLE_INFO("%s: Recovery over after %lld:%.02lld, of %d clients %d recovered and %d %s evicted.\n",
1676                               obd->obd_name, elapsed_time / 60,
1677                               elapsed_time % 60,
1678                               atomic_read(&obd->obd_max_recoverable_clients),
1679                               atomic_read(&obd->obd_connected_clients),
1680                               obd->obd_stale_clients,
1681                               obd->obd_stale_clients == 1 ? "was" : "were");
1682         }
1683
1684         ldlm_reprocess_recovery_done(obd->obd_namespace);
1685         spin_lock(&obd->obd_recovery_task_lock);
1686         if (!list_empty(&obd->obd_req_replay_queue) ||
1687             !list_empty(&obd->obd_lock_replay_queue) ||
1688             !list_empty(&obd->obd_final_req_queue)) {
1689                 CERROR("%s: Recovery queues ( %s%s%s) are not empty\n",
1690                        obd->obd_name,
1691                        list_empty(&obd->obd_req_replay_queue) ? "" : "req ",
1692                        list_empty(&obd->obd_lock_replay_queue) ? \
1693                                   "" : "lock ",
1694                        list_empty(&obd->obd_final_req_queue) ? \
1695                                   "" : "final ");
1696                 spin_unlock(&obd->obd_recovery_task_lock);
1697                 LBUG();
1698         }
1699         spin_unlock(&obd->obd_recovery_task_lock);
1700
1701         obd->obd_recovery_end = ktime_get_seconds();
1702
1703         /* When recovery finished, cleanup orphans on MDS and OST. */
1704         if (obd->obd_type && OBP(obd, postrecov)) {
1705                 int rc = OBP(obd, postrecov)(obd);
1706
1707                 if (rc < 0)
1708                         LCONSOLE_WARN("%s: Post recovery failed, rc %d\n",
1709                                       obd->obd_name, rc);
1710         }
1711         EXIT;
1712 }
1713
1714 static void abort_req_replay_queue(struct obd_device *obd)
1715 {
1716         struct ptlrpc_request *req, *n;
1717         LIST_HEAD(abort_list);
1718
1719         spin_lock(&obd->obd_recovery_task_lock);
1720         list_splice_init(&obd->obd_req_replay_queue, &abort_list);
1721         spin_unlock(&obd->obd_recovery_task_lock);
1722         list_for_each_entry_safe(req, n, &abort_list, rq_list) {
1723                 DEBUG_REQ(D_WARNING, req, "aborted:");
1724                 req->rq_status = -ENOTCONN;
1725                 if (ptlrpc_error(req)) {
1726                         DEBUG_REQ(D_ERROR, req,
1727                                   "failed abort_req_reply; skipping");
1728                 }
1729                 target_exp_dequeue_req_replay(req);
1730                 target_request_copy_put(req);
1731         }
1732 }
1733
1734 static void abort_lock_replay_queue(struct obd_device *obd)
1735 {
1736         struct ptlrpc_request *req, *n;
1737         LIST_HEAD(abort_list);
1738
1739         spin_lock(&obd->obd_recovery_task_lock);
1740         list_splice_init(&obd->obd_lock_replay_queue, &abort_list);
1741         spin_unlock(&obd->obd_recovery_task_lock);
1742         list_for_each_entry_safe(req, n, &abort_list, rq_list) {
1743                 DEBUG_REQ(D_ERROR, req, "aborted:");
1744                 req->rq_status = -ENOTCONN;
1745                 if (ptlrpc_error(req)) {
1746                         DEBUG_REQ(D_ERROR, req,
1747                                   "failed abort_lock_reply; skipping");
1748                 }
1749                 target_request_copy_put(req);
1750         }
1751 }
1752
1753 /*
1754  * Called from a cleanup function if the device is being cleaned up
1755  * forcefully.  The exports should all have been disconnected already,
1756  * the only thing left to do is
1757  * - clear the recovery flags
1758  * - cancel the timer
1759  * - free queued requests and replies, but don't send replies
1760  * Because the obd_stopping flag is set, no new requests should be received.
1761  */
1762 void target_cleanup_recovery(struct obd_device *obd)
1763 {
1764         struct ptlrpc_request *req, *n;
1765         LIST_HEAD(clean_list);
1766
1767         spin_lock(&obd->obd_dev_lock);
1768         if (!obd->obd_recovering) {
1769                 spin_unlock(&obd->obd_dev_lock);
1770                 EXIT;
1771                 return;
1772         }
1773         obd->obd_recovering = obd->obd_abort_recovery = 0;
1774         spin_unlock(&obd->obd_dev_lock);
1775
1776         spin_lock(&obd->obd_recovery_task_lock);
1777         target_cancel_recovery_timer(obd);
1778         list_splice_init(&obd->obd_req_replay_queue, &clean_list);
1779         spin_unlock(&obd->obd_recovery_task_lock);
1780
1781         list_for_each_entry_safe(req, n, &clean_list, rq_list) {
1782                 LASSERT(req->rq_reply_state == NULL);
1783                 target_exp_dequeue_req_replay(req);
1784                 target_request_copy_put(req);
1785         }
1786
1787         spin_lock(&obd->obd_recovery_task_lock);
1788         list_splice_init(&obd->obd_lock_replay_queue, &clean_list);
1789         list_splice_init(&obd->obd_final_req_queue, &clean_list);
1790         spin_unlock(&obd->obd_recovery_task_lock);
1791
1792         list_for_each_entry_safe(req, n, &clean_list, rq_list) {
1793                 LASSERT(req->rq_reply_state == NULL);
1794                 target_request_copy_put(req);
1795         }
1796
1797         EXIT;
1798 }
1799 EXPORT_SYMBOL(target_cleanup_recovery);
1800
1801 /* obd_recovery_task_lock should be held */
1802 void target_cancel_recovery_timer(struct obd_device *obd)
1803 {
1804         CDEBUG(D_HA, "%s: cancel recovery timer\n", obd->obd_name);
1805         hrtimer_cancel(&obd->obd_recovery_timer);
1806 }
1807
1808 static void target_start_recovery_timer(struct obd_device *obd)
1809 {
1810         ktime_t delay;
1811
1812         if (obd->obd_recovery_start != 0)
1813                 return;
1814
1815         spin_lock(&obd->obd_dev_lock);
1816         if (!obd->obd_recovering || obd->obd_abort_recovery) {
1817                 spin_unlock(&obd->obd_dev_lock);
1818                 return;
1819         }
1820
1821         LASSERT(obd->obd_recovery_timeout != 0);
1822
1823         if (obd->obd_recovery_start != 0) {
1824                 spin_unlock(&obd->obd_dev_lock);
1825                 return;
1826         }
1827
1828         obd->obd_recovery_start = ktime_get_seconds();
1829         delay = ktime_set(obd->obd_recovery_start +
1830                           obd->obd_recovery_timeout, 0);
1831         hrtimer_start(&obd->obd_recovery_timer, delay, HRTIMER_MODE_ABS);
1832         spin_unlock(&obd->obd_dev_lock);
1833
1834         LCONSOLE_WARN("%s: Will be in recovery for at least %u:%02u, or until %d client%s reconnect%s\n",
1835                       obd->obd_name,
1836                       obd->obd_recovery_timeout / 60,
1837                       obd->obd_recovery_timeout % 60,
1838                       atomic_read(&obd->obd_max_recoverable_clients),
1839                       (atomic_read(&obd->obd_max_recoverable_clients) == 1) ?
1840                       "" : "s",
1841                       (atomic_read(&obd->obd_max_recoverable_clients) == 1) ?
1842                       "s" : "");
1843 }
1844
1845 /**
1846  * extend recovery window.
1847  *
1848  * if @extend is true, extend recovery window to have @dr_timeout remaining
1849  * at least; otherwise, make sure the recovery timeout value is not less
1850  * than @dr_timeout.
1851  */
1852 static void extend_recovery_timer(struct obd_device *obd, timeout_t dr_timeout,
1853                                   bool extend)
1854 {
1855         ktime_t left_ns;
1856         timeout_t timeout;
1857         timeout_t left;
1858
1859         spin_lock(&obd->obd_dev_lock);
1860         if (!obd->obd_recovering || obd->obd_abort_recovery ||
1861             obd->obd_stopping) {
1862                 spin_unlock(&obd->obd_dev_lock);
1863                 return;
1864         }
1865         LASSERT(obd->obd_recovery_start != 0);
1866
1867         left_ns = hrtimer_expires_remaining(&obd->obd_recovery_timer);
1868         left = ktime_divns(left_ns, NSEC_PER_SEC);
1869
1870         if (extend) {
1871                 timeout = obd->obd_recovery_timeout;
1872                 /* dr_timeout will happen after the hrtimer has expired.
1873                  * Add the excess time to the soft recovery timeout without
1874                  * exceeding the hard recovery timeout.
1875                  */
1876                 if (dr_timeout > left) {
1877                         timeout += dr_timeout - left;
1878                         timeout = min_t(timeout_t, obd->obd_recovery_time_hard,
1879                                         timeout);
1880                 }
1881         } else {
1882                 timeout = clamp_t(timeout_t, dr_timeout,
1883                                   obd->obd_recovery_timeout,
1884                                   obd->obd_recovery_time_hard);
1885         }
1886
1887         if (timeout == obd->obd_recovery_time_hard)
1888                 CWARN("%s: extended recovery timer reached hard limit: %d, extend: %d\n",
1889                       obd->obd_name, timeout, extend);
1890
1891         if (obd->obd_recovery_timeout < timeout) {
1892                 ktime_t end, now;
1893
1894                 obd->obd_recovery_timeout = timeout;
1895                 end = ktime_set(obd->obd_recovery_start + timeout, 0);
1896                 now = ktime_set(ktime_get_seconds(), 0);
1897                 left_ns = ktime_sub(end, now);
1898                 hrtimer_start(&obd->obd_recovery_timer, end, HRTIMER_MODE_ABS);
1899                 left = ktime_divns(left_ns, NSEC_PER_SEC);
1900         }
1901         spin_unlock(&obd->obd_dev_lock);
1902
1903         CDEBUG(D_HA, "%s: recovery timer will expire in %d seconds\n",
1904                 obd->obd_name, left);
1905 }
1906
1907 /* Reset the timer with each new client connection */
1908 /*
1909  * This timer is actually reconnect_timer, which is for making sure
1910  * the total recovery window is at least as big as my reconnect
1911  * attempt timing. So the initial recovery time_out will be set to
1912  * OBD_RECOVERY_FACTOR * obd_timeout. If the timeout coming
1913  * from client is bigger than this, then the recovery time_out will
1914  * be extended to make sure the client could be reconnected, in the
1915  * process, the timeout from the new client should be ignored.
1916  */
1917 static void
1918 check_and_start_recovery_timer(struct obd_device *obd,
1919                                struct ptlrpc_request *req,
1920                                int new_client)
1921 {
1922         timeout_t service_timeout = lustre_msg_get_service_timeout(req->rq_reqmsg);
1923         struct obd_device_target *obt = &obd->u.obt;
1924
1925         if (!new_client && service_timeout)
1926                 /*
1927                  * Teach server about old server's estimates, as first guess
1928                  * at how long new requests will take.
1929                  */
1930                 at_measured(&req->rq_rqbd->rqbd_svcpt->scp_at_estimate,
1931                             service_timeout);
1932
1933         target_start_recovery_timer(obd);
1934
1935         /*
1936          * Convert the service time to RPC timeout,
1937          * and reuse service_timeout to limit stack usage.
1938          */
1939         service_timeout = at_est2timeout(service_timeout);
1940
1941         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_SLUGGISH_NET) &&
1942             service_timeout < at_extra)
1943                 service_timeout = at_extra;
1944
1945         /*
1946          * We expect other clients to timeout within service_timeout, then try
1947          * to reconnect, then try the failover server.  The max delay between
1948          * connect attempts is SWITCH_MAX + SWITCH_INC + INITIAL.
1949          */
1950         service_timeout += 2 * INITIAL_CONNECT_TIMEOUT;
1951
1952         LASSERT(obt->obt_magic == OBT_MAGIC);
1953         service_timeout += 2 * (CONNECTION_SWITCH_MAX + CONNECTION_SWITCH_INC);
1954         if (service_timeout > obd->obd_recovery_timeout && !new_client)
1955                 extend_recovery_timer(obd, service_timeout, false);
1956 }
1957
1958 /** Health checking routines */
1959 static inline int exp_connect_healthy(struct obd_export *exp)
1960 {
1961         return exp->exp_in_recovery;
1962 }
1963
1964 /** if export done req_replay or has replay in queue */
1965 static inline int exp_req_replay_healthy(struct obd_export *exp)
1966 {
1967         return (!exp->exp_req_replay_needed ||
1968                 atomic_read(&exp->exp_replay_count) > 0);
1969 }
1970
1971
1972 static inline int exp_req_replay_healthy_or_from_mdt(struct obd_export *exp)
1973 {
1974         return (exp_connect_flags(exp) & OBD_CONNECT_MDS_MDS) ||
1975                exp_req_replay_healthy(exp);
1976 }
1977
1978 /** if export done lock_replay or has replay in queue */
1979 static inline int exp_lock_replay_healthy(struct obd_export *exp)
1980 {
1981         return (!exp->exp_lock_replay_needed ||
1982                 atomic_read(&exp->exp_replay_count) > 0);
1983 }
1984
1985 static inline int exp_vbr_healthy(struct obd_export *exp)
1986 {
1987         return !exp->exp_vbr_failed;
1988 }
1989
1990 static inline int exp_finished(struct obd_export *exp)
1991 {
1992         return exp->exp_in_recovery && !exp->exp_lock_replay_needed;
1993 }
1994
1995 static inline int exp_finished_or_from_mdt(struct obd_export *exp)
1996 {
1997         return (exp_connect_flags(exp) & OBD_CONNECT_MDS_MDS) ||
1998                 exp_finished(exp);
1999 }
2000
2001 static int check_for_next_transno(struct lu_target *lut)
2002 {
2003         struct ptlrpc_request *req = NULL;
2004         struct obd_device *obd = lut->lut_obd;
2005         struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
2006         int wake_up = 0, connected, completed, queue_len;
2007         __u64 req_transno = 0;
2008         __u64 update_transno = 0;
2009         __u64 next_transno = 0;
2010
2011         ENTRY;
2012
2013         spin_lock(&obd->obd_recovery_task_lock);
2014         if (!list_empty(&obd->obd_req_replay_queue)) {
2015                 req = list_entry(obd->obd_req_replay_queue.next,
2016                                      struct ptlrpc_request, rq_list);
2017                 req_transno = lustre_msg_get_transno(req->rq_reqmsg);
2018         }
2019
2020         if (tdtd != NULL)
2021                 update_transno = distribute_txn_get_next_transno(tdtd);
2022
2023         connected = atomic_read(&obd->obd_connected_clients);
2024         completed = connected - atomic_read(&obd->obd_req_replay_clients);
2025         queue_len = obd->obd_requests_queued_for_recovery;
2026         next_transno = obd->obd_next_recovery_transno;
2027
2028         CDEBUG(D_HA,
2029                "max: %d, connected: %d, completed: %d, queue_len: %d, req_transno: %llu, next_transno: %llu\n",
2030                atomic_read(&obd->obd_max_recoverable_clients),
2031                connected, completed,
2032                queue_len, req_transno, next_transno);
2033
2034         if (obd->obd_abort_recovery) {
2035                 CDEBUG(D_HA, "waking for aborted recovery\n");
2036                 wake_up = 1;
2037         } else if (obd->obd_recovery_expired) {
2038                 CDEBUG(D_HA, "waking for expired recovery\n");
2039                 wake_up = 1;
2040         } else if (tdtd != NULL && req != NULL &&
2041                    is_req_replayed_by_update(req)) {
2042                 LASSERTF(req_transno < next_transno,
2043                          "req_transno %llu next_transno%llu\n", req_transno,
2044                          next_transno);
2045                 CDEBUG(D_HA, "waking for duplicate req (%llu)\n",
2046                        req_transno);
2047                 wake_up = 1;
2048         } else if (req_transno == next_transno ||
2049                    (update_transno != 0 && update_transno <= next_transno)) {
2050                 CDEBUG(D_HA, "waking for next (%lld)\n", next_transno);
2051                 wake_up = 1;
2052         } else if (queue_len > 0 &&
2053                    queue_len == atomic_read(&obd->obd_req_replay_clients)) {
2054                 /** handle gaps occured due to lost reply or VBR */
2055                 LASSERTF(req_transno >= next_transno,
2056                          "req_transno: %llu, next_transno: %llu\n",
2057                          req_transno, next_transno);
2058                 CDEBUG(D_HA,
2059                        "%s: waking for gap in transno, VBR is %s (skip: %lld, ql: %d, comp: %d, conn: %d, next: %lld, next_update %lld last_committed: %lld)\n",
2060                        obd->obd_name, obd->obd_version_recov ? "ON" : "OFF",
2061                        next_transno, queue_len, completed, connected,
2062                        req_transno, update_transno, obd->obd_last_committed);
2063                 obd->obd_next_recovery_transno = req_transno;
2064                 wake_up = 1;
2065         } else if (atomic_read(&obd->obd_req_replay_clients) == 0) {
2066                 CDEBUG(D_HA, "waking for completed recovery\n");
2067                 wake_up = 1;
2068         } else if (OBD_FAIL_CHECK(OBD_FAIL_MDS_RECOVERY_ACCEPTS_GAPS)) {
2069                 CDEBUG(D_HA,
2070                        "accepting transno gaps is explicitly allowed by fail_lock, waking up (%lld)\n",
2071                        next_transno);
2072                 obd->obd_next_recovery_transno = req_transno;
2073                 wake_up = 1;
2074         }
2075         spin_unlock(&obd->obd_recovery_task_lock);
2076         return wake_up;
2077 }
2078
2079 static int check_for_next_lock(struct lu_target *lut)
2080 {
2081         struct obd_device *obd = lut->lut_obd;
2082         int wake_up = 0;
2083
2084         spin_lock(&obd->obd_recovery_task_lock);
2085         if (!list_empty(&obd->obd_lock_replay_queue)) {
2086                 CDEBUG(D_HA, "waking for next lock\n");
2087                 wake_up = 1;
2088         } else if (atomic_read(&obd->obd_lock_replay_clients) == 0) {
2089                 CDEBUG(D_HA, "waking for completed lock replay\n");
2090                 wake_up = 1;
2091         } else if (obd->obd_abort_recovery) {
2092                 CDEBUG(D_HA, "waking for aborted recovery\n");
2093                 wake_up = 1;
2094         } else if (obd->obd_recovery_expired) {
2095                 CDEBUG(D_HA, "waking for expired recovery\n");
2096                 wake_up = 1;
2097         }
2098         spin_unlock(&obd->obd_recovery_task_lock);
2099
2100         return wake_up;
2101 }
2102
2103 /**
2104  * wait for recovery events,
2105  * check its status with help of check_routine
2106  * evict dead clients via health_check
2107  */
2108 static int target_recovery_overseer(struct lu_target *lut,
2109                                     int (*check_routine)(struct lu_target *),
2110                                     int (*health_check)(struct obd_export *))
2111 {
2112         struct obd_device *obd = lut->lut_obd;
2113         struct target_distribute_txn_data *tdtd;
2114         time64_t last = 0;
2115         time64_t now;
2116 repeat:
2117         if (obd->obd_recovering && obd->obd_recovery_start == 0) {
2118                 now = ktime_get_seconds();
2119                 if (now - last > 600) {
2120                         LCONSOLE_INFO("%s: in recovery but waiting for the first client to connect\n",
2121                                       obd->obd_name);
2122                         last = now;
2123                 }
2124         }
2125         if (obd->obd_recovery_start != 0 && ktime_get_seconds() >=
2126               (obd->obd_recovery_start + obd->obd_recovery_time_hard)) {
2127                 __u64 next_update_transno = 0;
2128
2129                 /*
2130                  * Only abort the recovery if there are no update recovery
2131                  * left in the queue
2132                  */
2133                 spin_lock(&obd->obd_recovery_task_lock);
2134                 if (lut->lut_tdtd != NULL) {
2135                         next_update_transno =
2136                                 distribute_txn_get_next_transno(lut->lut_tdtd);
2137
2138                         tdtd = lut->lut_tdtd;
2139                         /*
2140                          * If next_update_transno == 0, it probably because
2141                          * updatelog retrieve threads did not get any records
2142                          * yet, let's wait those threads stopped
2143                          */
2144                         if (next_update_transno == 0) {
2145                                 spin_unlock(&obd->obd_recovery_task_lock);
2146                                 wait_event_idle(
2147                                         tdtd->tdtd_recovery_threads_waitq,
2148                                         atomic_read(&tdtd->tdtd_recovery_threads_count)
2149                                         == 0);
2150
2151                                 spin_lock(&obd->obd_recovery_task_lock);
2152                                 next_update_transno =
2153                                         distribute_txn_get_next_transno(
2154                                                                 lut->lut_tdtd);
2155                         }
2156                 }
2157
2158                 if (next_update_transno != 0 && !obd->obd_abort_recovery) {
2159                         obd->obd_next_recovery_transno = next_update_transno;
2160                         spin_unlock(&obd->obd_recovery_task_lock);
2161                         /*
2162                          * Disconnect unfinished exports from clients, and
2163                          * keep connection from MDT to make sure the update
2164                          * recovery will still keep trying until some one
2165                          * manually abort the recovery
2166                          */
2167                         class_disconnect_stale_exports(obd,
2168                                                 exp_finished_or_from_mdt);
2169                         /* Abort all of replay & replay lock req from clients */
2170                         abort_req_replay_queue(obd);
2171                         abort_lock_replay_queue(obd);
2172                         CDEBUG(D_HA,
2173                                "%s: there are still update replay (%#llx)in the queue.\n",
2174                                obd->obd_name, next_update_transno);
2175                 } else {
2176                         obd->obd_abort_recovery = 1;
2177                         spin_unlock(&obd->obd_recovery_task_lock);
2178                         CWARN("%s recovery is aborted by hard timeout\n",
2179                               obd->obd_name);
2180                 }
2181         }
2182
2183         while (wait_event_timeout(obd->obd_next_transno_waitq,
2184                                   check_routine(lut),
2185                                   cfs_time_seconds(60)) == 0)
2186                 ; /* wait indefinitely for event, but don't trigger watchdog */
2187
2188         if (obd->obd_abort_recovery) {
2189                 CWARN("recovery is aborted, evict exports in recovery\n");
2190                 if (lut->lut_tdtd != NULL) {
2191                         tdtd = lut->lut_tdtd;
2192                         /*
2193                          * Let's wait all of the update log recovery thread
2194                          * finished
2195                          */
2196                         wait_event_idle(
2197                                 tdtd->tdtd_recovery_threads_waitq,
2198                                 atomic_read(&tdtd->tdtd_recovery_threads_count)
2199                                 == 0);
2200                         /* Then abort the update recovery list */
2201                         dtrq_list_destroy(lut->lut_tdtd);
2202                 }
2203
2204                 /** evict exports which didn't finish recovery yet */
2205                 class_disconnect_stale_exports(obd, exp_finished);
2206                 return 1;
2207         } else if (obd->obd_recovery_expired &&
2208                    obd->obd_recovery_timeout < obd->obd_recovery_time_hard) {
2209                 obd->obd_recovery_expired = 0;
2210
2211                 /** If some clients died being recovered, evict them */
2212                 LCONSOLE_WARN("%s: recovery is timed out, evict stale exports\n",
2213                               obd->obd_name);
2214                 /** evict cexports with no replay in queue, they are stalled */
2215                 class_disconnect_stale_exports(obd, health_check);
2216
2217                 /** continue with VBR */
2218                 spin_lock(&obd->obd_dev_lock);
2219                 obd->obd_version_recov = 1;
2220                 spin_unlock(&obd->obd_dev_lock);
2221                 /**
2222                  * reset timer, recovery will proceed with versions now,
2223                  * timeout is set just to handle reconnection delays
2224                  */
2225                 extend_recovery_timer(obd, RECONNECT_DELAY_MAX, true);
2226                 /**
2227                  * Wait for recovery events again, after evicting bad clients
2228                  */
2229                 goto repeat;
2230         }
2231         return 0;
2232 }
2233
2234 static struct ptlrpc_request *target_next_replay_lock(struct lu_target *lut)
2235 {
2236         struct obd_device *obd = lut->lut_obd;
2237         struct ptlrpc_request *req = NULL;
2238
2239         CDEBUG(D_HA, "Waiting for lock\n");
2240         if (target_recovery_overseer(lut, check_for_next_lock,
2241                                      exp_lock_replay_healthy))
2242                 abort_lock_replay_queue(obd);
2243
2244         spin_lock(&obd->obd_recovery_task_lock);
2245         if (!list_empty(&obd->obd_lock_replay_queue)) {
2246                 req = list_entry(obd->obd_lock_replay_queue.next,
2247                                      struct ptlrpc_request, rq_list);
2248                 list_del_init(&req->rq_list);
2249                 spin_unlock(&obd->obd_recovery_task_lock);
2250         } else {
2251                 spin_unlock(&obd->obd_recovery_task_lock);
2252                 LASSERT(list_empty(&obd->obd_lock_replay_queue));
2253                 LASSERT(atomic_read(&obd->obd_lock_replay_clients) == 0);
2254                 /** evict exports failed VBR */
2255                 class_disconnect_stale_exports(obd, exp_vbr_healthy);
2256         }
2257         return req;
2258 }
2259
2260 static struct ptlrpc_request *target_next_final_ping(struct obd_device *obd)
2261 {
2262         struct ptlrpc_request *req = NULL;
2263
2264         spin_lock(&obd->obd_recovery_task_lock);
2265         if (!list_empty(&obd->obd_final_req_queue)) {
2266                 req = list_entry(obd->obd_final_req_queue.next,
2267                                      struct ptlrpc_request, rq_list);
2268                 list_del_init(&req->rq_list);
2269                 spin_unlock(&obd->obd_recovery_task_lock);
2270                 if (req->rq_export->exp_in_recovery) {
2271                         spin_lock(&req->rq_export->exp_lock);
2272                         req->rq_export->exp_in_recovery = 0;
2273                         spin_unlock(&req->rq_export->exp_lock);
2274                 }
2275         } else {
2276                 spin_unlock(&obd->obd_recovery_task_lock);
2277         }
2278         return req;
2279 }
2280
2281 static void handle_recovery_req(struct ptlrpc_thread *thread,
2282                                 struct ptlrpc_request *req,
2283                                 svc_handler_t handler)
2284 {
2285         ENTRY;
2286
2287         /**
2288          * export can be evicted during recovery, no need to handle replays for
2289          * it after that, discard such request silently
2290          */
2291         if (req->rq_export->exp_disconnected)
2292                 RETURN_EXIT;
2293
2294         req->rq_session.lc_thread = thread;
2295         req->rq_svc_thread = thread;
2296         req->rq_svc_thread->t_env->le_ses = &req->rq_session;
2297
2298         /* thread context */
2299         lu_context_enter(&thread->t_env->le_ctx);
2300         (void)handler(req);
2301         lu_context_exit(&thread->t_env->le_ctx);
2302
2303         req->rq_svc_thread->t_env->le_ses = NULL;
2304
2305         /* don't reset timer for final stage */
2306         if (!exp_finished(req->rq_export)) {
2307                 timeout_t timeout = obd_timeout;
2308
2309                 /**
2310                  * Add request @timeout to the recovery time so next request from
2311                  * this client may come in recovery time
2312                  */
2313                 if (!AT_OFF) {
2314                         struct ptlrpc_service_part *svcpt;
2315                         timeout_t est_timeout;
2316
2317                         svcpt = req->rq_rqbd->rqbd_svcpt;
2318                         /*
2319                          * If the server sent early reply for this request,
2320                          * the client will recalculate the timeout according to
2321                          * current server estimate service time, so we will
2322                          * use the maxium timeout here for waiting the client
2323                          * sending the next req
2324                          */
2325                         est_timeout = at_get(&svcpt->scp_at_estimate);
2326                         timeout = max_t(timeout_t, at_est2timeout(est_timeout),
2327                                         lustre_msg_get_timeout(req->rq_reqmsg));
2328                         /*
2329                          * Add 2 net_latency, one for balance rq_deadline
2330                          * (see ptl_send_rpc), one for resend the req to server,
2331                          * Note: client will pack net_latency in replay req
2332                          * (see ptlrpc_replay_req)
2333                          */
2334                         timeout += 2 * lustre_msg_get_service_timeout(req->rq_reqmsg);
2335                 }
2336                 extend_recovery_timer(class_exp2obd(req->rq_export), timeout,
2337                                       true);
2338         }
2339         EXIT;
2340 }
2341
2342 /** Checking routines for recovery */
2343 static int check_for_recovery_ready(struct lu_target *lut)
2344 {
2345         struct obd_device *obd = lut->lut_obd;
2346         unsigned int clnts = atomic_read(&obd->obd_connected_clients);
2347
2348         CDEBUG(D_HA,
2349                "connected %d stale %d max_recoverable_clients %d abort %d expired %d\n",
2350                clnts, obd->obd_stale_clients,
2351                atomic_read(&obd->obd_max_recoverable_clients),
2352                obd->obd_abort_recovery, obd->obd_recovery_expired);
2353
2354         if (!obd->obd_abort_recovery && !obd->obd_recovery_expired) {
2355                 LASSERT(clnts <=
2356                         atomic_read(&obd->obd_max_recoverable_clients));
2357                 if (clnts + obd->obd_stale_clients <
2358                     atomic_read(&obd->obd_max_recoverable_clients))
2359                         return 0;
2360         }
2361
2362         if (lut->lut_tdtd != NULL) {
2363                 if (!lut->lut_tdtd->tdtd_replay_ready &&
2364                     !obd->obd_abort_recovery && !obd->obd_stopping) {
2365                         /*
2366                          * Let's extend recovery timer, in case the recovery
2367                          * timer expired, and some clients got evicted
2368                          */
2369                         extend_recovery_timer(obd, obd->obd_recovery_timeout,
2370                                               true);
2371                         CDEBUG(D_HA,
2372                                "%s update recovery is not ready, extend recovery %d\n",
2373                                obd->obd_name, obd->obd_recovery_timeout);
2374                         return 0;
2375                 }
2376         }
2377
2378         return 1;
2379 }
2380
2381 enum {
2382         REQUEST_RECOVERY = 1,
2383         UPDATE_RECOVERY = 2,
2384 };
2385
2386 static __u64 get_next_replay_req_transno(struct obd_device *obd)
2387 {
2388         __u64 transno = 0;
2389
2390         if (!list_empty(&obd->obd_req_replay_queue)) {
2391                 struct ptlrpc_request *req;
2392
2393                 req = list_entry(obd->obd_req_replay_queue.next,
2394                                  struct ptlrpc_request, rq_list);
2395                 transno = lustre_msg_get_transno(req->rq_reqmsg);
2396         }
2397
2398         return transno;
2399 }
2400
2401 static __u64 get_next_transno(struct lu_target *lut, int *type)
2402 {
2403         struct obd_device *obd = lut->lut_obd;
2404         struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
2405         __u64 transno = 0;
2406         __u64 update_transno;
2407
2408         ENTRY;
2409
2410         transno = get_next_replay_req_transno(obd);
2411         if (type != NULL)
2412                 *type = REQUEST_RECOVERY;
2413
2414         if (tdtd == NULL)
2415                 RETURN(transno);
2416
2417         update_transno = distribute_txn_get_next_transno(tdtd);
2418         if (transno == 0 || (transno >= update_transno &&
2419                              update_transno != 0)) {
2420                 transno = update_transno;
2421                 if (type != NULL)
2422                         *type = UPDATE_RECOVERY;
2423         }
2424
2425         RETURN(transno);
2426 }
2427
2428 /**
2429  * drop duplicate replay request
2430  *
2431  * Because the operation has been replayed by update recovery, the request
2432  * with the same transno will be dropped and also notify the client to send
2433  * next replay request.
2434  *
2435  * \param[in] env       execution environment
2436  * \param[in] obd       failover obd device
2437  * \param[in] req       request to be dropped
2438  */
2439 static void drop_duplicate_replay_req(struct lu_env *env,
2440                                       struct obd_device *obd,
2441                                       struct ptlrpc_request *req)
2442 {
2443         DEBUG_REQ(D_HA, req,
2444                   "remove t%lld from %s because duplicate update records found",
2445                   lustre_msg_get_transno(req->rq_reqmsg),
2446                   libcfs_nid2str(req->rq_peer.nid));
2447
2448         /*
2449          * Right now, only for MDS reint operation update replay and
2450          * normal request replay can have the same transno
2451          */
2452         if (lustre_msg_get_opc(req->rq_reqmsg) == MDS_REINT) {
2453                 req_capsule_set(&req->rq_pill, &RQF_MDS_REINT);
2454                 req->rq_status = req_capsule_server_pack(&req->rq_pill);
2455                 if (likely(req->rq_export))
2456                         target_committed_to_req(req);
2457                 lustre_msg_set_transno(req->rq_repmsg, req->rq_transno);
2458                 target_send_reply(req, req->rq_status, 0);
2459         } else {
2460                 DEBUG_REQ(D_ERROR, req, "wrong opc from %s",
2461                 libcfs_nid2str(req->rq_peer.nid));
2462         }
2463         target_exp_dequeue_req_replay(req);
2464         target_request_copy_put(req);
2465         obd->obd_replayed_requests++;
2466 }
2467
2468 static void replay_request_or_update(struct lu_env *env,
2469                                      struct lu_target *lut,
2470                                      struct target_recovery_data *trd,
2471                                      struct ptlrpc_thread *thread)
2472 {
2473         struct obd_device *obd = lut->lut_obd;
2474         struct ptlrpc_request *req = NULL;
2475         int type;
2476         __u64 transno;
2477
2478         ENTRY;
2479
2480         CDEBUG(D_HA, "Waiting for transno %lld\n",
2481                obd->obd_next_recovery_transno);
2482
2483         /* Replay all of request and update by transno */
2484         do {
2485                 struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
2486
2487                 CFS_FAIL_TIMEOUT(OBD_FAIL_TGT_REPLAY_DELAY2, cfs_fail_val);
2488
2489                 /**
2490                  * It is needed to extend recovery window above
2491                  *  recovery_time_soft. Extending is possible only in the
2492                  *  end of recovery window (see more details in
2493                  *  handle_recovery_req()).
2494                  */
2495                 CFS_FAIL_TIMEOUT_MS(OBD_FAIL_TGT_REPLAY_DELAY, 300);
2496
2497                 if (target_recovery_overseer(lut, check_for_next_transno,
2498                                         exp_req_replay_healthy_or_from_mdt)) {
2499                         abort_req_replay_queue(obd);
2500                         abort_lock_replay_queue(obd);
2501                         goto abort;
2502                 }
2503
2504                 spin_lock(&obd->obd_recovery_task_lock);
2505                 transno = get_next_transno(lut, &type);
2506                 if (type == REQUEST_RECOVERY && transno != 0) {
2507                         /*
2508                          * Drop replay request from client side, if the
2509                          * replay has been executed by update with the
2510                          * same transno
2511                          */
2512                         req = list_entry(obd->obd_req_replay_queue.next,
2513                                         struct ptlrpc_request, rq_list);
2514
2515                         list_del_init(&req->rq_list);
2516                         obd->obd_requests_queued_for_recovery--;
2517                         spin_unlock(&obd->obd_recovery_task_lock);
2518
2519                         /*
2520                          * Let's check if the request has been redone by
2521                          * update replay
2522                          */
2523                         if (is_req_replayed_by_update(req)) {
2524                                 struct distribute_txn_replay_req *dtrq;
2525
2526                                 dtrq = distribute_txn_lookup_finish_list(tdtd,
2527                                                                       transno);
2528                                 LASSERT(dtrq != NULL);
2529                                 spin_lock(&tdtd->tdtd_replay_list_lock);
2530                                 list_del_init(&dtrq->dtrq_list);
2531                                 spin_unlock(&tdtd->tdtd_replay_list_lock);
2532                                 dtrq_destroy(dtrq);
2533
2534                                 drop_duplicate_replay_req(env, obd, req);
2535
2536                                 continue;
2537                         }
2538
2539                         LASSERT(trd->trd_processing_task == current->pid);
2540                         DEBUG_REQ(D_HA, req, "processing x%llu t%lld from %s",
2541                                   req->rq_xid,
2542                                   lustre_msg_get_transno(req->rq_reqmsg),
2543                                   libcfs_nid2str(req->rq_peer.nid));
2544
2545                         handle_recovery_req(thread, req,
2546                                             trd->trd_recovery_handler);
2547                         /**
2548                          * bz18031: increase next_recovery_transno before
2549                          * target_request_copy_put() will drop exp_rpc reference
2550                          */
2551                         spin_lock(&obd->obd_recovery_task_lock);
2552                         obd->obd_next_recovery_transno++;
2553                         spin_unlock(&obd->obd_recovery_task_lock);
2554                         target_exp_dequeue_req_replay(req);
2555                         target_request_copy_put(req);
2556                         obd->obd_replayed_requests++;
2557                 } else if (type == UPDATE_RECOVERY && transno != 0) {
2558                         struct distribute_txn_replay_req *dtrq;
2559                         int rc;
2560
2561                         spin_unlock(&obd->obd_recovery_task_lock);
2562
2563                         LASSERT(tdtd != NULL);
2564                         dtrq = distribute_txn_get_next_req(tdtd);
2565                         lu_context_enter(&thread->t_env->le_ctx);
2566                         rc = tdtd->tdtd_replay_handler(env, tdtd, dtrq);
2567                         lu_context_exit(&thread->t_env->le_ctx);
2568                         extend_recovery_timer(obd, obd_timeout, true);
2569
2570                         if (rc == 0 && dtrq->dtrq_xid != 0) {
2571                                 CDEBUG(D_HA,
2572                                        "Move x%llu t%llu to finish list\n",
2573                                        dtrq->dtrq_xid,
2574                                        dtrq->dtrq_master_transno);
2575
2576                                 /* Add it to the replay finish list */
2577                                 spin_lock(&tdtd->tdtd_replay_list_lock);
2578                                 list_add(&dtrq->dtrq_list,
2579                                          &tdtd->tdtd_replay_finish_list);
2580                                 spin_unlock(&tdtd->tdtd_replay_list_lock);
2581
2582                                 spin_lock(&obd->obd_recovery_task_lock);
2583                                 if (transno == obd->obd_next_recovery_transno)
2584                                         obd->obd_next_recovery_transno++;
2585                                 else if (transno >
2586                                          obd->obd_next_recovery_transno)
2587                                         obd->obd_next_recovery_transno =
2588                                                                 transno + 1;
2589                                 spin_unlock(&obd->obd_recovery_task_lock);
2590                         } else {
2591                                 dtrq_destroy(dtrq);
2592                         }
2593                 } else {
2594                         spin_unlock(&obd->obd_recovery_task_lock);
2595 abort:
2596                         LASSERT(list_empty(&obd->obd_req_replay_queue));
2597                         LASSERT(atomic_read(&obd->obd_req_replay_clients) == 0);
2598                         /** evict exports failed VBR */
2599                         class_disconnect_stale_exports(obd, exp_vbr_healthy);
2600                         break;
2601                 }
2602         } while (1);
2603 }
2604
2605 static int target_recovery_thread(void *arg)
2606 {
2607         struct lu_target *lut = arg;
2608         struct obd_device *obd = lut->lut_obd;
2609         struct ptlrpc_request *req;
2610         struct target_recovery_data *trd = &obd->obd_recovery_data;
2611         unsigned long delta;
2612         struct lu_env *env;
2613         struct ptlrpc_thread *thread = NULL;
2614         int rc = 0;
2615
2616         ENTRY;
2617
2618         unshare_fs_struct();
2619         OBD_ALLOC_PTR(thread);
2620         if (thread == NULL)
2621                 RETURN(-ENOMEM);
2622
2623         OBD_ALLOC_PTR(env);
2624         if (env == NULL)
2625                 GOTO(out_thread, rc = -ENOMEM);
2626         rc = lu_env_add(env);
2627         if (rc)
2628                 GOTO(out_env, rc);
2629
2630         rc = lu_context_init(&env->le_ctx, LCT_MD_THREAD | LCT_DT_THREAD);
2631         if (rc)
2632                 GOTO(out_env_remove, rc);
2633
2634         thread->t_env = env;
2635         thread->t_id = -1; /* force filter_iobuf_get/put to use local buffers */
2636         env->le_ctx.lc_thread = thread;
2637         tgt_io_thread_init(thread); /* init thread_big_cache for IO requests */
2638
2639         CDEBUG(D_HA, "%s: started recovery thread pid %d\n", obd->obd_name,
2640                current->pid);
2641         trd->trd_processing_task = current->pid;
2642
2643         spin_lock(&obd->obd_dev_lock);
2644         obd->obd_recovering = 1;
2645         spin_unlock(&obd->obd_dev_lock);
2646         complete(&trd->trd_starting);
2647
2648         /* first of all, we have to know the first transno to replay */
2649         if (target_recovery_overseer(lut, check_for_recovery_ready,
2650                                      exp_connect_healthy)) {
2651                 abort_req_replay_queue(obd);
2652                 abort_lock_replay_queue(obd);
2653                 if (lut->lut_tdtd != NULL)
2654                         dtrq_list_destroy(lut->lut_tdtd);
2655         }
2656
2657         /* next stage: replay requests or update */
2658         delta = jiffies;
2659         CDEBUG(D_INFO, "1: request replay stage - %d clients from t%llu\n",
2660                atomic_read(&obd->obd_req_replay_clients),
2661                obd->obd_next_recovery_transno);
2662         replay_request_or_update(env, lut, trd, thread);
2663
2664         /**
2665          * The second stage: replay locks
2666          */
2667         CDEBUG(D_INFO, "2: lock replay stage - %d clients\n",
2668                atomic_read(&obd->obd_lock_replay_clients));
2669         while ((req = target_next_replay_lock(lut))) {
2670                 LASSERT(trd->trd_processing_task == current->pid);
2671                 DEBUG_REQ(D_HA, req, "processing lock from %s:",
2672                           libcfs_nid2str(req->rq_peer.nid));
2673                 handle_recovery_req(thread, req,
2674                                     trd->trd_recovery_handler);
2675                 target_request_copy_put(req);
2676                 obd->obd_replayed_locks++;
2677         }
2678
2679         /**
2680          * The third stage: reply on final pings, at this moment all clients
2681          * must have request in final queue
2682          */
2683         CFS_FAIL_TIMEOUT(OBD_FAIL_TGT_REPLAY_RECONNECT, cfs_fail_val);
2684         CDEBUG(D_INFO, "3: final stage - process recovery completion pings\n");
2685         /** Update server last boot epoch */
2686         tgt_boot_epoch_update(lut);
2687         /*
2688          * We drop recoverying flag to forward all new requests
2689          * to regular mds_handle() since now
2690          */
2691         spin_lock(&obd->obd_dev_lock);
2692         obd->obd_recovering = obd->obd_abort_recovery = 0;
2693         spin_unlock(&obd->obd_dev_lock);
2694         spin_lock(&obd->obd_recovery_task_lock);
2695         target_cancel_recovery_timer(obd);
2696         spin_unlock(&obd->obd_recovery_task_lock);
2697         while ((req = target_next_final_ping(obd))) {
2698                 LASSERT(trd->trd_processing_task == current->pid);
2699                 DEBUG_REQ(D_HA, req, "processing final ping from %s:",
2700                           libcfs_nid2str(req->rq_peer.nid));
2701                 handle_recovery_req(thread, req,
2702                                     trd->trd_recovery_handler);
2703                 /*
2704                  * Because the waiting client can not send ping to server,
2705                  * so we need refresh the last_request_time, to avoid the
2706                  * export is being evicted
2707                  */
2708                 ptlrpc_update_export_timer(req->rq_export, 0);
2709                 target_request_copy_put(req);
2710         }
2711
2712         delta = jiffies_to_msecs(jiffies - delta) / MSEC_PER_SEC;
2713         CDEBUG(D_INFO, "4: recovery completed in %lus - %d/%d reqs/locks\n",
2714                delta, obd->obd_replayed_requests, obd->obd_replayed_locks);
2715         if (delta > OBD_RECOVERY_TIME_SOFT) {
2716                 CWARN("too long recovery - read logs\n");
2717                 libcfs_debug_dumplog();
2718         }
2719
2720         target_finish_recovery(lut);
2721         lu_context_fini(&env->le_ctx);
2722         trd->trd_processing_task = 0;
2723         complete_all(&trd->trd_finishing);
2724         tgt_io_thread_done(thread);
2725 out_env_remove:
2726         lu_env_remove(env);
2727 out_env:
2728         OBD_FREE_PTR(env);
2729 out_thread:
2730         OBD_FREE_PTR(thread);
2731         RETURN(rc);
2732 }
2733
2734 static int target_start_recovery_thread(struct lu_target *lut,
2735                                         svc_handler_t handler)
2736 {
2737         struct obd_device *obd = lut->lut_obd;
2738         int rc = 0;
2739         struct target_recovery_data *trd = &obd->obd_recovery_data;
2740         int index;
2741
2742         memset(trd, 0, sizeof(*trd));
2743         init_completion(&trd->trd_starting);
2744         init_completion(&trd->trd_finishing);
2745         trd->trd_recovery_handler = handler;
2746
2747         rc = server_name2index(obd->obd_name, &index, NULL);
2748         if (rc < 0)
2749                 return rc;
2750
2751         if (!IS_ERR(kthread_run(target_recovery_thread,
2752                                 lut, "tgt_recover_%d", index))) {
2753                 wait_for_completion(&trd->trd_starting);
2754                 LASSERT(obd->obd_recovering != 0);
2755         } else {
2756                 rc = -ECHILD;
2757         }
2758
2759         return rc;
2760 }
2761
2762 void target_stop_recovery_thread(struct obd_device *obd)
2763 {
2764         if (obd->obd_recovery_data.trd_processing_task > 0) {
2765                 struct target_recovery_data *trd = &obd->obd_recovery_data;
2766                 /** recovery can be done but postrecovery is not yet */
2767                 spin_lock(&obd->obd_dev_lock);
2768                 if (obd->obd_recovering) {
2769                         CERROR("%s: Aborting recovery\n", obd->obd_name);
2770                         obd->obd_abort_recovery = 1;
2771                         wake_up(&obd->obd_next_transno_waitq);
2772                 }
2773                 spin_unlock(&obd->obd_dev_lock);
2774                 wait_for_completion(&trd->trd_finishing);
2775         }
2776 }
2777 EXPORT_SYMBOL(target_stop_recovery_thread);
2778
2779 void target_recovery_fini(struct obd_device *obd)
2780 {
2781         class_disconnect_exports(obd);
2782         target_stop_recovery_thread(obd);
2783         target_cleanup_recovery(obd);
2784 }
2785 EXPORT_SYMBOL(target_recovery_fini);
2786
2787 static enum hrtimer_restart target_recovery_expired(struct hrtimer *timer)
2788 {
2789         struct obd_device *obd = container_of(timer, struct obd_device,
2790                                               obd_recovery_timer);
2791
2792         CDEBUG(D_HA,
2793                "%s: recovery timed out; %d clients are still in recovery after %llu seconds (%d clients connected)\n",
2794                obd->obd_name, atomic_read(&obd->obd_lock_replay_clients),
2795                ktime_get_seconds() - obd->obd_recovery_start,
2796                atomic_read(&obd->obd_connected_clients));
2797
2798         obd->obd_recovery_expired = 1;
2799         wake_up(&obd->obd_next_transno_waitq);
2800         return HRTIMER_NORESTART;
2801 }
2802
2803 void target_recovery_init(struct lu_target *lut, svc_handler_t handler)
2804 {
2805         struct obd_device *obd = lut->lut_obd;
2806
2807         if (lut->lut_bottom->dd_rdonly)
2808                 return;
2809
2810         if (atomic_read(&obd->obd_max_recoverable_clients) == 0) {
2811                 /** Update server last boot epoch */
2812                 tgt_boot_epoch_update(lut);
2813                 return;
2814         }
2815
2816         CDEBUG(D_HA, "RECOVERY: service %s, %d recoverable clients, "
2817                "last_transno %llu\n", obd->obd_name,
2818                atomic_read(&obd->obd_max_recoverable_clients),
2819                obd->obd_last_committed);
2820         LASSERT(obd->obd_stopping == 0);
2821         obd->obd_next_recovery_transno = obd->obd_last_committed + 1;
2822         obd->obd_recovery_start = 0;
2823         obd->obd_recovery_end = 0;
2824
2825         hrtimer_init(&obd->obd_recovery_timer, CLOCK_MONOTONIC,
2826                      HRTIMER_MODE_ABS);
2827         obd->obd_recovery_timer.function = &target_recovery_expired;
2828         target_start_recovery_thread(lut, handler);
2829 }
2830 EXPORT_SYMBOL(target_recovery_init);
2831
2832 static int target_process_req_flags(struct obd_device *obd,
2833                                     struct ptlrpc_request *req)
2834 {
2835         struct obd_export *exp = req->rq_export;
2836
2837         LASSERT(exp != NULL);
2838         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
2839                 /* client declares he's ready to replay locks */
2840                 spin_lock(&exp->exp_lock);
2841                 if (exp->exp_req_replay_needed) {
2842                         exp->exp_req_replay_needed = 0;
2843                         spin_unlock(&exp->exp_lock);
2844
2845                         LASSERT_ATOMIC_POS(&obd->obd_req_replay_clients);
2846                         atomic_dec(&obd->obd_req_replay_clients);
2847                 } else {
2848                         spin_unlock(&exp->exp_lock);
2849                 }
2850         }
2851         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
2852                 /*
2853                  * client declares he's ready to complete recovery
2854                  * so, we put the request on th final queue
2855                  */
2856                 spin_lock(&exp->exp_lock);
2857                 if (exp->exp_lock_replay_needed) {
2858                         exp->exp_lock_replay_needed = 0;
2859                         spin_unlock(&exp->exp_lock);
2860
2861                         LASSERT_ATOMIC_POS(&obd->obd_lock_replay_clients);
2862                         atomic_dec(&obd->obd_lock_replay_clients);
2863                 } else {
2864                         spin_unlock(&exp->exp_lock);
2865                 }
2866         }
2867         return 0;
2868 }
2869
2870 int target_queue_recovery_request(struct ptlrpc_request *req,
2871                                   struct obd_device *obd)
2872 {
2873         __u64 transno = lustre_msg_get_transno(req->rq_reqmsg);
2874         struct ptlrpc_request *reqiter;
2875         int inserted = 0;
2876
2877         ENTRY;
2878
2879         if (obd->obd_recovery_data.trd_processing_task == current->pid) {
2880                 /* Processing the queue right now, don't re-add. */
2881                 RETURN(1);
2882         }
2883
2884         target_process_req_flags(obd, req);
2885
2886         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
2887                 if (unlikely(OBD_FAIL_CHECK(OBD_FAIL_TGT_RECOVERY_REQ_RACE))) {
2888                         if (cfs_fail_val == 1) {
2889                                 cfs_race_state = 1;
2890                                 cfs_fail_val = 0;
2891                                 wake_up(&cfs_race_waitq);
2892
2893                                 schedule_timeout_interruptible(
2894                                         cfs_time_seconds(1));
2895                         }
2896                 }
2897
2898                 /*
2899                  * client declares he's ready to complete recovery
2900                  * so, we put the request on th final queue
2901                  */
2902                 target_request_copy_get(req);
2903                 DEBUG_REQ(D_HA, req, "queue final req");
2904                 wake_up(&obd->obd_next_transno_waitq);
2905                 spin_lock(&obd->obd_recovery_task_lock);
2906                 if (obd->obd_recovering) {
2907                         struct ptlrpc_request *tmp;
2908                         struct ptlrpc_request *duplicate = NULL;
2909
2910                         if (likely(!req->rq_export->exp_replay_done)) {
2911                                 req->rq_export->exp_replay_done = 1;
2912                                 list_add_tail(&req->rq_list,
2913                                               &obd->obd_final_req_queue);
2914                                 spin_unlock(&obd->obd_recovery_task_lock);
2915                                 RETURN(0);
2916                         }
2917
2918                         /*
2919                          * XXX O(n), but only happens if final ping is
2920                          * timed out, probably reorganize the list as
2921                          * a hash list later
2922                          */
2923                         list_for_each_entry_safe(reqiter, tmp,
2924                                                  &obd->obd_final_req_queue,
2925                                                  rq_list) {
2926                                 if (reqiter->rq_export == req->rq_export) {
2927                                         list_del_init(&reqiter->rq_list);
2928                                         duplicate = reqiter;
2929                                         break;
2930                                 }
2931                         }
2932
2933                         list_add_tail(&req->rq_list,
2934                                       &obd->obd_final_req_queue);
2935                         req->rq_export->exp_replay_done = 1;
2936                         spin_unlock(&obd->obd_recovery_task_lock);
2937
2938                         if (duplicate != NULL) {
2939                                 DEBUG_REQ(D_HA, duplicate,
2940                                           "put prev final req");
2941                                 target_request_copy_put(duplicate);
2942                         }
2943                         RETURN(0);
2944                 } else {
2945                         spin_unlock(&obd->obd_recovery_task_lock);
2946                         target_request_copy_put(req);
2947                         RETURN(obd->obd_stopping ? -ENOTCONN : 1);
2948                 }
2949         }
2950         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
2951                 /* client declares he's ready to replay locks */
2952                 target_request_copy_get(req);
2953                 DEBUG_REQ(D_HA, req, "queue lock replay req");
2954                 wake_up(&obd->obd_next_transno_waitq);
2955                 spin_lock(&obd->obd_recovery_task_lock);
2956                 LASSERT(obd->obd_recovering);
2957                 /* usually due to recovery abort */
2958                 if (!req->rq_export->exp_in_recovery) {
2959                         spin_unlock(&obd->obd_recovery_task_lock);
2960                         target_request_copy_put(req);
2961                         RETURN(-ENOTCONN);
2962                 }
2963                 LASSERT(req->rq_export->exp_lock_replay_needed);
2964                 list_add_tail(&req->rq_list, &obd->obd_lock_replay_queue);
2965                 spin_unlock(&obd->obd_recovery_task_lock);
2966                 RETURN(0);
2967         }
2968
2969         /*
2970          * CAVEAT EMPTOR: The incoming request message has been swabbed
2971          * (i.e. buflens etc are in my own byte order), but type-dependent
2972          * buffers (eg mdt_body, ost_body etc) have NOT been swabbed.
2973          */
2974
2975         if (!transno) {
2976                 INIT_LIST_HEAD(&req->rq_list);
2977                 DEBUG_REQ(D_HA, req, "not queueing");
2978                 RETURN(1);
2979         }
2980
2981         /*
2982          * If we're processing the queue, we want don't want to queue this
2983          * message.
2984          *
2985          * Also, if this request has a transno less than the one we're waiting
2986          * for, we should process it now.  It could (and currently always will)
2987          * be an open request for a descriptor that was opened some time ago.
2988          *
2989          * Also, a resent, replayed request that has already been
2990          * handled will pass through here and be processed immediately.
2991          */
2992         CDEBUG(D_HA,
2993                "Next recovery transno: %llu, current: %llu, replaying\n",
2994                obd->obd_next_recovery_transno, transno);
2995
2996         /*
2997          * If the request has been replayed by update replay, then sends this
2998          * request to the recovery thread (replay_request_or_update()), where
2999          * it will be handled
3000          */
3001         spin_lock(&obd->obd_recovery_task_lock);
3002         if (transno < obd->obd_next_recovery_transno &&
3003             !is_req_replayed_by_update(req)) {
3004                 /* Processing the queue right now, don't re-add. */
3005                 LASSERT(list_empty(&req->rq_list));
3006                 spin_unlock(&obd->obd_recovery_task_lock);
3007                 RETURN(1);
3008         }
3009         spin_unlock(&obd->obd_recovery_task_lock);
3010
3011         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_REPLAY_DROP))
3012                 RETURN(0);
3013
3014         target_request_copy_get(req);
3015         if (!req->rq_export->exp_in_recovery) {
3016                 target_request_copy_put(req);
3017                 RETURN(-ENOTCONN);
3018         }
3019         LASSERT(req->rq_export->exp_req_replay_needed);
3020
3021         if (target_exp_enqueue_req_replay(req)) {
3022                 DEBUG_REQ(D_ERROR, req, "dropping resent queued req");
3023                 target_request_copy_put(req);
3024                 RETURN(0);
3025         }
3026
3027         /* XXX O(n^2) */
3028         spin_lock(&obd->obd_recovery_task_lock);
3029         LASSERT(obd->obd_recovering);
3030         list_for_each_entry(reqiter, &obd->obd_req_replay_queue, rq_list) {
3031                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) > transno) {
3032                         list_add_tail(&req->rq_list, &reqiter->rq_list);
3033                         inserted = 1;
3034                         goto added;
3035                 }
3036
3037                 if (unlikely(lustre_msg_get_transno(reqiter->rq_reqmsg) ==
3038                              transno)) {
3039                         DEBUG_REQ(D_ERROR, req,
3040                                   "dropping replay: transno has been claimed by another client");
3041                         spin_unlock(&obd->obd_recovery_task_lock);
3042                         target_exp_dequeue_req_replay(req);
3043                         target_request_copy_put(req);
3044                         RETURN(0);
3045                 }
3046         }
3047 added:
3048         if (!inserted)
3049                 list_add_tail(&req->rq_list, &obd->obd_req_replay_queue);
3050
3051         obd->obd_requests_queued_for_recovery++;
3052         spin_unlock(&obd->obd_recovery_task_lock);
3053         wake_up(&obd->obd_next_transno_waitq);
3054         RETURN(0);
3055 }
3056
3057 void target_committed_to_req(struct ptlrpc_request *req)
3058 {
3059         struct obd_export *exp = req->rq_export;
3060
3061         if (!exp->exp_obd->obd_no_transno && req->rq_repmsg != NULL)
3062                 lustre_msg_set_last_committed(req->rq_repmsg,
3063                                               exp->exp_last_committed);
3064         else
3065                 DEBUG_REQ(D_IOCTL, req,
3066                           "not sending last_committed update (%d/%d)",
3067                           exp->exp_obd->obd_no_transno,
3068                           req->rq_repmsg == NULL);
3069
3070         CDEBUG(D_INFO, "last_committed %llu, transno %llu, xid %llu\n",
3071                exp->exp_last_committed, req->rq_transno, req->rq_xid);
3072 }
3073
3074 #endif /* HAVE_SERVER_SUPPORT */
3075
3076 /**
3077  * Packs current SLV and Limit into \a req.
3078  */
3079 int target_pack_pool_reply(struct ptlrpc_request *req)
3080 {
3081         struct obd_device *obd;
3082
3083         ENTRY;
3084
3085         /*
3086          * Check that we still have all structures alive as this may
3087          * be some late RPC at shutdown time.
3088          */
3089         if (unlikely(!req->rq_export || !req->rq_export->exp_obd ||
3090                      !exp_connect_lru_resize(req->rq_export))) {
3091                 lustre_msg_set_slv(req->rq_repmsg, 0);
3092                 lustre_msg_set_limit(req->rq_repmsg, 0);
3093                 RETURN(0);
3094         }
3095
3096         /* OBD is alive here as export is alive, which we checked above. */
3097         obd = req->rq_export->exp_obd;
3098
3099         read_lock(&obd->obd_pool_lock);
3100         lustre_msg_set_slv(req->rq_repmsg, obd->obd_pool_slv);
3101         lustre_msg_set_limit(req->rq_repmsg, obd->obd_pool_limit);
3102         read_unlock(&obd->obd_pool_lock);
3103
3104         RETURN(0);
3105 }
3106
3107 static int target_send_reply_msg(struct ptlrpc_request *req,
3108                                  int rc, int fail_id)
3109 {
3110         if (OBD_FAIL_CHECK_ORSET(fail_id & ~OBD_FAIL_ONCE, OBD_FAIL_ONCE)) {
3111                 DEBUG_REQ(D_ERROR, req, "dropping reply");
3112                 return -ECOMM;
3113         }
3114         /*
3115          * We can have a null rq_reqmsg in the event of bad signature or
3116          * no context when unwrapping
3117          */
3118         if (req->rq_reqmsg &&
3119             unlikely(lustre_msg_get_opc(req->rq_reqmsg) == MDS_REINT &&
3120             OBD_FAIL_CHECK(OBD_FAIL_MDS_REINT_MULTI_NET_REP)))
3121                 return -ECOMM;
3122
3123         if (unlikely(rc)) {
3124                 DEBUG_REQ(D_NET, req, "processing error (%d)", rc);
3125                 req->rq_status = rc;
3126                 return ptlrpc_send_error(req, 1);
3127         }
3128         DEBUG_REQ(D_NET, req, "sending reply");
3129
3130         return ptlrpc_send_reply(req, PTLRPC_REPLY_MAYBE_DIFFICULT);
3131 }
3132
3133 void target_send_reply(struct ptlrpc_request *req, int rc, int fail_id)
3134 {
3135         struct ptlrpc_service_part *svcpt;
3136         int netrc;
3137         struct ptlrpc_reply_state *rs;
3138         struct obd_export *exp;
3139
3140         ENTRY;
3141
3142         if (req->rq_no_reply) {
3143                 EXIT;
3144                 return;
3145         }
3146
3147         svcpt = req->rq_rqbd->rqbd_svcpt;
3148         rs = req->rq_reply_state;
3149         if (rs == NULL || !rs->rs_difficult) {
3150                 /* no notifiers */
3151                 target_send_reply_msg(req, rc, fail_id);
3152                 EXIT;
3153                 return;
3154         }
3155
3156         /* must be an export if locks saved */
3157         LASSERT(req->rq_export != NULL);
3158         /* req/reply consistent */
3159         LASSERT(rs->rs_svcpt == svcpt);
3160
3161         /* "fresh" reply */
3162         LASSERT(!rs->rs_scheduled);
3163         LASSERT(!rs->rs_scheduled_ever);
3164         LASSERT(!rs->rs_handled);
3165         LASSERT(!rs->rs_on_net);
3166         LASSERT(rs->rs_export == NULL);
3167         LASSERT(list_empty(&rs->rs_obd_list));
3168         LASSERT(list_empty(&rs->rs_exp_list));
3169
3170         exp = class_export_get(req->rq_export);
3171
3172         /* disable reply scheduling while I'm setting up */
3173         rs->rs_scheduled = 1;
3174         rs->rs_on_net    = 1;
3175         rs->rs_xid       = req->rq_xid;
3176         rs->rs_transno   = req->rq_transno;
3177         rs->rs_export    = exp;