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LU-13088 ldlm: Fix sleeping function called in atomic
[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 *obddev, struct lustre_cfg *lcfg)
275 {
276         struct client_obd *cli = &obddev->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 = obddev->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_LIST_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(obddev->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                            &obddev->obd_ldlm_client);
486
487         imp = class_new_import(obddev);
488         if (imp == NULL)
489                 GOTO(err_ldlm, rc = -ENOENT);
490         imp->imp_client = &obddev->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                                obddev->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, obddev->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         obddev->obd_namespace = ldlm_namespace_new(obddev, obddev->obd_name,
533                                                    LDLM_NAMESPACE_CLIENT,
534                                                    LDLM_NAMESPACE_GREEDY,
535                                                    ns_type);
536         if (obddev->obd_namespace == NULL) {
537                 CERROR("Unable to create client namespace - %s\n",
538                        obddev->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 *obddev)
559 {
560         struct client_obd *cli = &obddev->u.cli;
561
562         ENTRY;
563
564         ldlm_namespace_free_post(obddev->obd_namespace);
565         obddev->obd_namespace = NULL;
566
567         obd_cleanup_client_import(obddev);
568         LASSERT(obddev->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 /*
791  * --------------------------------------------------------------------------
792  * from old lib/target.c
793  * --------------------------------------------------------------------------
794  */
795
796 static int target_handle_reconnect(struct lustre_handle *conn,
797                                    struct obd_export *exp,
798                                    struct obd_uuid *cluuid)
799 {
800         struct obd_device *target;
801         struct lustre_handle *hdl;
802         ktime_t remaining;
803         s64 timeout;
804         int rc = 0;
805
806         ENTRY;
807         hdl = &exp->exp_imp_reverse->imp_remote_handle;
808         if (!exp->exp_connection || !lustre_handle_is_used(hdl)) {
809                 conn->cookie = exp->exp_handle.h_cookie;
810                 CDEBUG(D_HA,
811                        "connect export for UUID '%s' at %p, cookie %#llx\n",
812                        cluuid->uuid, exp, conn->cookie);
813                 RETURN(0);
814         }
815
816         target = exp->exp_obd;
817
818         /* Might be a re-connect after a partition. */
819         if (memcmp(&conn->cookie, &hdl->cookie, sizeof(conn->cookie))) {
820                 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",
821                               target->obd_name,
822                               obd_uuid2str(&exp->exp_client_uuid),
823                               obd_export_nid2str(exp),
824                               hdl->cookie, conn->cookie);
825                 memset(conn, 0, sizeof(*conn));
826                 /*
827                  * target_handle_connect() treats EALREADY and
828                  * -EALREADY differently.  -EALREADY is an error
829                  * (same UUID, different handle).
830                  */
831                 RETURN(-EALREADY);
832         }
833
834         if (!target->obd_recovering) {
835                 LCONSOLE_WARN("%s: Client %s (at %s) reconnecting\n",
836                         target->obd_name, obd_uuid2str(&exp->exp_client_uuid),
837                         obd_export_nid2str(exp));
838                 GOTO(out_already, rc);
839         }
840
841         remaining = hrtimer_expires_remaining(&target->obd_recovery_timer);
842         timeout = ktime_divns(remaining, NSEC_PER_SEC);
843         if (timeout > 0) {
844                 LCONSOLE_WARN("%s: Client %s (at %s) reconnected, waiting for %d clients in recovery for %lld:%.02lld\n",
845                               target->obd_name,
846                               obd_uuid2str(&exp->exp_client_uuid),
847                               obd_export_nid2str(exp),
848                               atomic_read(&target->obd_max_recoverable_clients),
849                               timeout / 60, timeout % 60);
850         } else {
851                 struct target_distribute_txn_data *tdtd;
852                 int size = 0;
853                 int count = 0;
854                 char *buf = NULL;
855
856                 tdtd = class_exp2tgt(exp)->lut_tdtd;
857                 if (tdtd && tdtd->tdtd_show_update_logs_retrievers)
858                         buf = tdtd->tdtd_show_update_logs_retrievers(
859                                 tdtd->tdtd_show_retrievers_cbdata,
860                                 &size, &count);
861
862                 if (count > 0)
863                         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",
864                                       target->obd_name,
865                                       obd_uuid2str(&exp->exp_client_uuid),
866                                       obd_export_nid2str(exp), count,
867                                       buf ? buf : "unknown (not enough RAM)",
868                                       (abs(timeout) + target->obd_recovery_timeout) / 60,
869                                       (abs(timeout) + target->obd_recovery_timeout) % 60,
870                                       target->obd_name);
871                 else
872                         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",
873                                       target->obd_name, abs(timeout) / 60,
874                                       abs(timeout) % 60, target->obd_name);
875
876                 if (buf != NULL)
877                         OBD_FREE(buf, size);
878         }
879
880 out_already:
881         conn->cookie = exp->exp_handle.h_cookie;
882         /*
883          * target_handle_connect() treats EALREADY and
884          * -EALREADY differently.  EALREADY means we are
885          * doing a valid reconnect from the same client.
886          */
887         RETURN(EALREADY);
888 }
889
890 static void
891 check_and_start_recovery_timer(struct obd_device *obd,
892                                struct ptlrpc_request *req, int new_client);
893
894 /**
895  * update flags for import during reconnect process
896  */
897 static int rev_import_flags_update(struct obd_import *revimp,
898                                    struct ptlrpc_request *req)
899 {
900         int rc;
901         struct obd_connect_data *data;
902
903         data = req_capsule_client_get(&req->rq_pill, &RMF_CONNECT_DATA);
904
905         if (data->ocd_connect_flags & OBD_CONNECT_AT)
906                 revimp->imp_msghdr_flags |= MSGHDR_AT_SUPPORT;
907         else
908                 revimp->imp_msghdr_flags &= ~MSGHDR_AT_SUPPORT;
909
910         revimp->imp_msghdr_flags |= MSGHDR_CKSUM_INCOMPAT18;
911
912         rc = sptlrpc_import_sec_adapt(revimp, req->rq_svc_ctx, &req->rq_flvr);
913         if (rc) {
914                 CERROR("%s: cannot get reverse import %s security: rc = %d\n",
915                         revimp->imp_client->cli_name,
916                         libcfs_id2str(req->rq_peer), rc);
917                 return rc;
918         }
919
920         return 0;
921 }
922
923 /**
924  * Allocate a new reverse import for an export.
925  *
926  * \retval -errno in case error hit
927  * \retval 0 if reverse import correctly init
928  **/
929 int rev_import_init(struct obd_export *export)
930 {
931         struct obd_device *obd = export->exp_obd;
932         struct obd_import *revimp;
933
934         LASSERT(export->exp_imp_reverse == NULL);
935
936         revimp = class_new_import(obd);
937         if (revimp == NULL)
938                 return -ENOMEM;
939
940         revimp->imp_remote_handle.cookie = 0ULL;
941         revimp->imp_client = &obd->obd_ldlm_client;
942         revimp->imp_dlm_fake = 1;
943
944         /* it is safe to connect import in new state as no sends possible */
945         spin_lock(&export->exp_lock);
946         export->exp_imp_reverse = revimp;
947         spin_unlock(&export->exp_lock);
948         class_import_put(revimp);
949
950         return 0;
951 }
952 EXPORT_SYMBOL(rev_import_init);
953
954 /**
955  * Handle reconnect for an export.
956  *
957  * \param exp export to handle reconnect process
958  * \param req client reconnect request
959  *
960  * \retval -rc in case securitfy flavor can't be changed
961  * \retval 0 in case none problems
962  */
963 static int rev_import_reconnect(struct obd_export *exp,
964                                 struct ptlrpc_request *req)
965 {
966         struct obd_import *revimp = exp->exp_imp_reverse;
967         struct lustre_handle *lh;
968         int rc;
969
970         /* avoid sending a request until import flags are changed */
971         ptlrpc_import_enter_resend(revimp);
972
973         if (revimp->imp_connection != NULL)
974                 ptlrpc_connection_put(revimp->imp_connection);
975
976         /*
977          * client from recovery don't have a handle so we need to take from
978          * request. it may produce situation when wrong client connected
979          * to recovery as we trust a client uuid
980          */
981         lh = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
982         revimp->imp_remote_handle = *lh;
983
984         /*
985          * unknown versions will be caught in
986          * ptlrpc_handle_server_req_in->lustre_unpack_msg()
987          */
988         revimp->imp_msg_magic = req->rq_reqmsg->lm_magic;
989
990         revimp->imp_connection = ptlrpc_connection_addref(exp->exp_connection);
991
992         rc = rev_import_flags_update(revimp, req);
993         if (rc != 0) {
994                 /*
995                  * it is safe to still be in RECOVERY phase as we are not able
996                  * to setup correct security flavor so requests are not able to
997                  * be delivered correctly
998                  */
999                 return rc;
1000         }
1001
1002         /* resend all rpc's via new connection */
1003         return ptlrpc_import_recovery_state_machine(revimp);
1004 }
1005
1006 int target_handle_connect(struct ptlrpc_request *req)
1007 {
1008         struct obd_device *target = NULL;
1009         struct obd_export *export = NULL;
1010         /*
1011          * connect handle - filled from target_handle_reconnect in
1012          * reconnect case
1013          */
1014         struct lustre_handle conn;
1015         struct lustre_handle *tmp;
1016         struct obd_uuid cluuid;
1017         char *str;
1018         int rc = 0;
1019         char *target_start;
1020         int target_len;
1021         bool mds_conn = false, lw_client = false, initial_conn = false;
1022         bool mds_mds_conn = false;
1023         bool new_mds_mds_conn = false;
1024         struct obd_connect_data *data, *tmpdata;
1025         int size, tmpsize;
1026         lnet_nid_t *client_nid = NULL;
1027
1028         ENTRY;
1029
1030         OBD_RACE(OBD_FAIL_TGT_CONN_RACE);
1031
1032         str = req_capsule_client_get(&req->rq_pill, &RMF_TGTUUID);
1033         if (str == NULL) {
1034                 DEBUG_REQ(D_ERROR, req, "bad target UUID for connect");
1035                 GOTO(out, rc = -EINVAL);
1036         }
1037
1038         target = class_dev_by_str(str);
1039         if (!target) {
1040                 deuuidify(str, NULL, &target_start, &target_len);
1041                 LCONSOLE_ERROR_MSG(0x137,
1042                                    "%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",
1043                                    str, libcfs_nid2str(req->rq_peer.nid));
1044                 GOTO(out, rc = -ENODEV);
1045         }
1046
1047         spin_lock(&target->obd_dev_lock);
1048
1049         target->obd_conn_inprogress++;
1050
1051         if (target->obd_stopping || !target->obd_set_up) {
1052                 spin_unlock(&target->obd_dev_lock);
1053
1054                 deuuidify(str, NULL, &target_start, &target_len);
1055                 LCONSOLE_INFO("%.*s: Not available for connect from %s (%s)\n",
1056                               target_len, target_start,
1057                               libcfs_nid2str(req->rq_peer.nid),
1058                               (target->obd_stopping ?
1059                                "stopping" : "not set up"));
1060                 GOTO(out, rc = -ENODEV);
1061         }
1062
1063         if (target->obd_no_conn) {
1064                 spin_unlock(&target->obd_dev_lock);
1065
1066                 CDEBUG(D_INFO,
1067                        "%s: Temporarily refusing client connection from %s\n",
1068                        target->obd_name, libcfs_nid2str(req->rq_peer.nid));
1069                 GOTO(out, rc = -EAGAIN);
1070         }
1071
1072         spin_unlock(&target->obd_dev_lock);
1073
1074         str = req_capsule_client_get(&req->rq_pill, &RMF_CLUUID);
1075         if (str == NULL) {
1076                 DEBUG_REQ(D_ERROR, req, "bad client UUID for connect");
1077                 GOTO(out, rc = -EINVAL);
1078         }
1079
1080         obd_str2uuid(&cluuid, str);
1081
1082         tmp = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
1083         if (tmp == NULL)
1084                 GOTO(out, rc = -EPROTO);
1085
1086         conn = *tmp;
1087
1088         size = req_capsule_get_size(&req->rq_pill, &RMF_CONNECT_DATA,
1089                                     RCL_CLIENT);
1090         if (size < 0 || size > 8 * sizeof(struct obd_connect_data))
1091                 GOTO(out, rc = -EPROTO);
1092         data = req_capsule_client_get(&req->rq_pill, &RMF_CONNECT_DATA);
1093         if (!data)
1094                 GOTO(out, rc = -EPROTO);
1095
1096         rc = req_capsule_server_pack(&req->rq_pill);
1097         if (rc)
1098                 GOTO(out, rc);
1099
1100 #if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(3, 0, 53, 0)
1101         /*
1102          * Don't allow clients to connect that are using old 1.8 format
1103          * protocol conventions (LUSTRE_MSG_MAGIC_v1, !MSGHDR_CKSUM_INCOMPAT18,
1104          * ldlm_flock_policy_wire format, MDT_ATTR_xTIME_SET, etc).  The
1105          * FULL20 flag should be set on all connections since 2.0, but no
1106          * longer affects behaviour.
1107          *
1108          * Later this check will be disabled and the flag can be retired
1109          * completely once interop with 3.0 is no longer needed.
1110          */
1111         if (!(data->ocd_connect_flags & OBD_CONNECT_FULL20))
1112                 GOTO(out, rc = -EPROTO);
1113
1114         /*
1115          * Don't allow liblustre clients to connect.
1116          * - testing was disabled in v2_2_50_0-61-g6a75d65
1117          * - building was disabled in v2_5_58_0-28-g7277179
1118          * - client code was deleted in v2_6_50_0-101-gcdfbc72,
1119          * - clients were refused connect for version difference > 0.0.1.32
1120          */
1121         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
1122                 DEBUG_REQ(D_WARNING, req, "Refusing libclient connection");
1123                 GOTO(out, rc = -EPROTO);
1124         }
1125 #endif
1126
1127         /*
1128          * Note: lw_client is needed in MDS-MDS failover during update log
1129          * processing, so we needs to allow lw_client to be connected at
1130          * anytime, instead of only the initial connection
1131          */
1132         lw_client = (data->ocd_connect_flags & OBD_CONNECT_LIGHTWEIGHT) != 0;
1133
1134         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_INITIAL) {
1135                 initial_conn = true;
1136                 mds_conn = (data->ocd_connect_flags & OBD_CONNECT_MDS) != 0;
1137                 mds_mds_conn = (data->ocd_connect_flags &
1138                                 OBD_CONNECT_MDS_MDS) != 0;
1139
1140                 /*
1141                  * OBD_CONNECT_MNE_SWAB is defined as OBD_CONNECT_MDS_MDS
1142                  * for Imperative Recovery connection from MGC to MGS.
1143                  *
1144                  * Via check OBD_CONNECT_FID, we can distinguish whether
1145                  * the OBD_CONNECT_MDS_MDS/OBD_CONNECT_MNE_SWAB is from
1146                  * MGC or MDT, since MGC does not use OBD_CONNECT_FID.
1147                  */
1148                 if (!lw_client &&
1149                     (data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) &&
1150                     (data->ocd_connect_flags & OBD_CONNECT_FID) &&
1151                     (data->ocd_connect_flags & OBD_CONNECT_VERSION)) {
1152                         __u32 major = OBD_OCD_VERSION_MAJOR(data->ocd_version);
1153                         __u32 minor = OBD_OCD_VERSION_MINOR(data->ocd_version);
1154                         __u32 patch = OBD_OCD_VERSION_PATCH(data->ocd_version);
1155
1156                         /*
1157                          * We do not support the MDT-MDT interoperations with
1158                          * different version MDT because of protocol changes.
1159                          */
1160                         if (unlikely(major != LUSTRE_MAJOR ||
1161                                      minor != LUSTRE_MINOR ||
1162                                      abs(patch - LUSTRE_PATCH) > 3)) {
1163                                 LCONSOLE_WARN("%s (%u.%u.%u.%u) refused the connection from different version MDT (%d.%d.%d.%d) %s %s\n",
1164                                               target->obd_name, LUSTRE_MAJOR,
1165                                               LUSTRE_MINOR, LUSTRE_PATCH,
1166                                               LUSTRE_FIX, major, minor, patch,
1167                                               OBD_OCD_VERSION_FIX(data->ocd_version),
1168                                               libcfs_nid2str(req->rq_peer.nid),
1169                                               str);
1170                                 GOTO(out, rc = -EPROTO);
1171                         }
1172                 }
1173         }
1174
1175         /* lctl gets a backstage, all-access pass. */
1176         if (obd_uuid_equals(&cluuid, &target->obd_uuid))
1177                 goto dont_check_exports;
1178
1179         export = obd_uuid_lookup(target, &cluuid);
1180         if (!export)
1181                 goto no_export;
1182
1183         /* We've found an export in the hash. */
1184
1185         spin_lock(&export->exp_lock);
1186
1187         if (export->exp_connecting) { /* b=9635, et. al. */
1188                 spin_unlock(&export->exp_lock);
1189                 LCONSOLE_WARN("%s: Export %p already connecting from %s\n",
1190                               export->exp_obd->obd_name, export,
1191                               libcfs_nid2str(req->rq_peer.nid));
1192                 class_export_put(export);
1193                 export = NULL;
1194                 rc = -EALREADY;
1195         } else if ((mds_conn || (lw_client && initial_conn) ||
1196                    data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) &&
1197                    export->exp_connection != NULL) {
1198                 spin_unlock(&export->exp_lock);
1199                 if (req->rq_peer.nid != export->exp_connection->c_peer.nid) {
1200                         /* MDS or LWP reconnected after failover. */
1201                         LCONSOLE_WARN("%s: Received %s connection from %s, removing former export from %s\n",
1202                                       target->obd_name,
1203                                       mds_conn ? "MDS" : "LWP",
1204                                       libcfs_nid2str(req->rq_peer.nid),
1205                                       libcfs_nid2str(export->exp_connection->c_peer.nid));
1206                 } else {
1207                         /* New MDS connection from the same NID. */
1208                         LCONSOLE_WARN("%s: Received new %s connection from %s, removing former export from same NID\n",
1209                                       target->obd_name,
1210                                       mds_conn ? "MDS" : "LWP",
1211                                       libcfs_nid2str(req->rq_peer.nid));
1212                 }
1213
1214                 if (req->rq_peer.nid == export->exp_connection->c_peer.nid &&
1215                     data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) {
1216                         /*
1217                          * Because exports between MDTs will always be
1218                          * kept, let's do not fail such export if they
1219                          * come from the same NID, otherwise it might
1220                          * cause eviction between MDTs, which might
1221                          * cause namespace inconsistency
1222                          */
1223                         spin_lock(&export->exp_lock);
1224                         export->exp_connecting = 1;
1225                         export->exp_conn_cnt = 0;
1226                         spin_unlock(&export->exp_lock);
1227                         conn.cookie = export->exp_handle.h_cookie;
1228                         rc = EALREADY;
1229                 } else {
1230                         class_fail_export(export);
1231                         class_export_put(export);
1232                         export = NULL;
1233                         rc = 0;
1234                 }
1235         } else if (export->exp_connection != NULL && initial_conn &&
1236                    req->rq_peer.nid != export->exp_connection->c_peer.nid) {
1237                 spin_unlock(&export->exp_lock);
1238                 /* In MDS failover we have static UUID but NID can change. */
1239                 LCONSOLE_WARN("%s: Client %s seen on new nid %s when existing nid %s is already connected\n",
1240                               target->obd_name, cluuid.uuid,
1241                               libcfs_nid2str(req->rq_peer.nid),
1242                               libcfs_nid2str(
1243                                         export->exp_connection->c_peer.nid));
1244                 rc = -EALREADY;
1245                 class_export_put(export);
1246                 export = NULL;
1247         } else if (OBD_FAIL_PRECHECK(OBD_FAIL_TGT_RECOVERY_CONNECT) &&
1248                    !lw_client) {
1249                 spin_unlock(&export->exp_lock);
1250                 rc = -EAGAIN;
1251         } else {
1252                 export->exp_connecting = 1;
1253                 spin_unlock(&export->exp_lock);
1254                 LASSERT(export->exp_obd == target);
1255
1256                 rc = target_handle_reconnect(&conn, export, &cluuid);
1257         }
1258
1259         /* If we found an export, we already unlocked. */
1260         if (!export) {
1261 no_export:
1262                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_CONNECT, 2 * obd_timeout);
1263         } else if (req->rq_export == NULL &&
1264                    atomic_read(&export->exp_rpc_count) > 0) {
1265                 LCONSOLE_WARN("%s: Client %s (at %s) refused connection, still busy with %d references\n",
1266                               target->obd_name, cluuid.uuid,
1267                               libcfs_nid2str(req->rq_peer.nid),
1268                               refcount_read(&export->exp_handle.h_ref));
1269                         GOTO(out, rc = -EBUSY);
1270         } else if (lustre_msg_get_conn_cnt(req->rq_reqmsg) == 1 &&
1271                    rc != EALREADY) {
1272                 if (!strstr(cluuid.uuid, "mdt"))
1273                         LCONSOLE_WARN("%s: Rejecting reconnect from the known client %s (at %s) because it is indicating it is a new client",
1274                                       target->obd_name, cluuid.uuid,
1275                                       libcfs_nid2str(req->rq_peer.nid));
1276                 GOTO(out, rc = -EALREADY);
1277         } else {
1278                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_RECONNECT, 2 * obd_timeout);
1279         }
1280
1281         if (rc < 0)
1282                 GOTO(out, rc);
1283
1284         CDEBUG(D_HA, "%s: connection from %s@%s %st%llu exp %p cur %lld last %lld\n",
1285                target->obd_name, cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
1286                target->obd_recovering ? "recovering/" : "", data->ocd_transno,
1287                export, ktime_get_seconds(),
1288                export ? export->exp_last_request_time : 0);
1289
1290         /*
1291          * If this is the first time a client connects, reset the recovery
1292          * timer. Discard lightweight connections which might be local.
1293          */
1294         if (!lw_client && rc == 0 && target->obd_recovering)
1295                 check_and_start_recovery_timer(target, req, export == NULL);
1296
1297         /*
1298          * We want to handle EALREADY but *not* -EALREADY from
1299          * target_handle_reconnect(), return reconnection state in a flag.
1300          */
1301         if (rc == EALREADY) {
1302                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECONNECT);
1303                 rc = 0;
1304         } else {
1305                 LASSERT(rc == 0);
1306         }
1307
1308         /* Tell the client if we support replayable requests. */
1309         if (target->obd_replayable)
1310                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_REPLAYABLE);
1311         client_nid = &req->rq_peer.nid;
1312
1313         if (export == NULL) {
1314                 /* allow lightweight connections during recovery */
1315                 /*
1316                  * allow "new" MDT to be connected during recovery, since we
1317                  * need retrieve recovery update records from it
1318                  */
1319                 if (target->obd_recovering && !lw_client && !mds_mds_conn) {
1320                         struct hrtimer *timer = &target->obd_recovery_timer;
1321                         ktime_t remaining;
1322                         s64 timeout, left;
1323                         int in_progress;
1324                         int connected;
1325                         int known;
1326                         int stale;
1327                         char *msg;
1328
1329                         connected = atomic_read(&target->obd_connected_clients);
1330                         in_progress = atomic_read(&target->obd_lock_replay_clients);
1331                         known =
1332                            atomic_read(&target->obd_max_recoverable_clients);
1333                         stale = target->obd_stale_clients;
1334                         remaining = hrtimer_expires_remaining(timer);
1335                         left = ktime_divns(remaining, NSEC_PER_SEC);
1336
1337                         if (ktime_to_ns(remaining) > 0) {
1338                                 msg = "to recover in";
1339                                 timeout = left;
1340                         } else {
1341                                 msg = "already passed deadline";
1342                                 timeout = -left;
1343                         }
1344
1345                         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",
1346                                       target->obd_name, cluuid.uuid,
1347                                       libcfs_nid2str(req->rq_peer.nid), known,
1348                                       connected - in_progress, in_progress,
1349                                       stale, msg, timeout / 60, timeout % 60);
1350                         rc = -EBUSY;
1351                 } else {
1352 dont_check_exports:
1353                         rc = obd_connect(req->rq_svc_thread->t_env,
1354                                          &export, target, &cluuid, data,
1355                                          client_nid);
1356                         if (mds_conn && OBD_FAIL_CHECK(OBD_FAIL_TGT_RCVG_FLAG))
1357                                 lustre_msg_add_op_flags(req->rq_repmsg,
1358                                                         MSG_CONNECT_RECOVERING);
1359                         if (rc == 0) {
1360                                 conn.cookie = export->exp_handle.h_cookie;
1361                                 rc = rev_import_init(export);
1362                         }
1363
1364                         if (mds_mds_conn)
1365                                 new_mds_mds_conn = true;
1366                 }
1367         } else {
1368                 rc = obd_reconnect(req->rq_svc_thread->t_env,
1369                                    export, target, &cluuid, data, client_nid);
1370         }
1371         if (rc)
1372                 GOTO(out, rc);
1373
1374         LASSERT(target->u.obt.obt_magic == OBT_MAGIC);
1375         data->ocd_instance = target->u.obt.obt_instance;
1376
1377         /*
1378          * Return only the parts of obd_connect_data that we understand, so the
1379          * client knows that we don't understand the rest.
1380          */
1381         if (data) {
1382                 tmpsize = req_capsule_get_size(&req->rq_pill, &RMF_CONNECT_DATA,
1383                                                RCL_SERVER);
1384                 tmpdata = req_capsule_server_get(&req->rq_pill,
1385                                                  &RMF_CONNECT_DATA);
1386                 /*
1387                  * Don't use struct assignment here, because the client reply
1388                  * buffer may be smaller/larger than the local struct
1389                  * obd_connect_data.
1390                  */
1391                 memcpy(tmpdata, data, min(tmpsize, size));
1392         }
1393
1394         /*
1395          * If the client and the server are the same node, we will already
1396          * have an export that really points to the client's DLM export,
1397          * because we have a shared handles table.
1398          *
1399          * XXX this will go away when shaver stops sending the "connect" handle
1400          * in the real "remote handle" field of the request --phik 24 Apr 2003
1401          */
1402         ptlrpc_request_change_export(req, export);
1403
1404         spin_lock(&export->exp_lock);
1405         if (export->exp_conn_cnt >= lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
1406                 spin_unlock(&export->exp_lock);
1407                 CDEBUG(D_RPCTRACE,
1408                        "%s: %s already connected at greater or equal conn_cnt: %d >= %d\n",
1409                        cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
1410                        export->exp_conn_cnt,
1411                        lustre_msg_get_conn_cnt(req->rq_reqmsg));
1412
1413                 GOTO(out, rc = -EALREADY);
1414         }
1415         LASSERT(lustre_msg_get_conn_cnt(req->rq_reqmsg) > 0);
1416         export->exp_conn_cnt = lustre_msg_get_conn_cnt(req->rq_reqmsg);
1417         spin_unlock(&export->exp_lock);
1418
1419         if (export->exp_connection != NULL) {
1420                 /* Check to see if connection came from another NID. */
1421                 if ((export->exp_connection->c_peer.nid != req->rq_peer.nid) &&
1422                     !hlist_unhashed(&export->exp_nid_hash))
1423                         cfs_hash_del(export->exp_obd->obd_nid_hash,
1424                                      &export->exp_connection->c_peer.nid,
1425                                      &export->exp_nid_hash);
1426
1427                 ptlrpc_connection_put(export->exp_connection);
1428         }
1429
1430         export->exp_connection = ptlrpc_connection_get(req->rq_peer,
1431                                                        req->rq_self,
1432                                                        &cluuid);
1433         if (hlist_unhashed(&export->exp_nid_hash))
1434                 cfs_hash_add(export->exp_obd->obd_nid_hash,
1435                              &export->exp_connection->c_peer.nid,
1436                              &export->exp_nid_hash);
1437
1438         lustre_msg_set_handle(req->rq_repmsg, &conn);
1439
1440         rc = rev_import_reconnect(export, req);
1441         if (rc != 0)
1442                 GOTO(out, rc);
1443
1444         if (target->obd_recovering && !export->exp_in_recovery && !lw_client) {
1445                 int has_transno;
1446                 __u64 transno = data->ocd_transno;
1447
1448                 spin_lock(&export->exp_lock);
1449                 /*
1450                  * possible race with class_disconnect_stale_exports,
1451                  * export may be already in the eviction process
1452                  */
1453                 if (export->exp_failed) {
1454                         spin_unlock(&export->exp_lock);
1455                         GOTO(out, rc = -ENODEV);
1456                 }
1457                 export->exp_in_recovery = 1;
1458                 export->exp_req_replay_needed = 1;
1459                 export->exp_lock_replay_needed = 1;
1460                 spin_unlock(&export->exp_lock);
1461
1462                 has_transno = !!(lustre_msg_get_op_flags(req->rq_reqmsg) &
1463                                  MSG_CONNECT_TRANSNO);
1464                 if (has_transno && transno == 0)
1465                         CWARN("Connect with zero transno!\n");
1466
1467                 if (has_transno && transno > 0 &&
1468                     transno < target->obd_next_recovery_transno &&
1469                     transno > target->obd_last_committed) {
1470                         /* Another way is to use cmpxchg() to be lock-free. */
1471                         spin_lock(&target->obd_recovery_task_lock);
1472                         if (transno < target->obd_next_recovery_transno)
1473                                 target->obd_next_recovery_transno = transno;
1474                         spin_unlock(&target->obd_recovery_task_lock);
1475                 }
1476
1477                 atomic_inc(&target->obd_req_replay_clients);
1478                 atomic_inc(&target->obd_lock_replay_clients);
1479                 /*
1480                  * Note: MDS-MDS connection is allowed to be connected during
1481                  * recovery, no matter if the exports needs to be recoveried.
1482                  * Because we need retrieve updates logs from all other MDTs.
1483                  * So if the MDS-MDS export is new, obd_max_recoverable_clients
1484                  * also needs to be increased to match other recovery checking
1485                  * condition.
1486                  */
1487                 if (new_mds_mds_conn)
1488                         atomic_inc(&target->obd_max_recoverable_clients);
1489
1490                 if (atomic_inc_return(&target->obd_connected_clients) ==
1491                     atomic_read(&target->obd_max_recoverable_clients))
1492                         wake_up(&target->obd_next_transno_waitq);
1493         }
1494
1495         /* Tell the client we're in recovery, when client is involved in it. */
1496         if (target->obd_recovering && !lw_client)
1497                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECOVERING);
1498
1499 out:
1500         if (export) {
1501                 spin_lock(&export->exp_lock);
1502                 export->exp_connecting = 0;
1503                 spin_unlock(&export->exp_lock);
1504
1505                 class_export_put(export);
1506         }
1507         if (target != NULL) {
1508                 spin_lock(&target->obd_dev_lock);
1509                 target->obd_conn_inprogress--;
1510                 spin_unlock(&target->obd_dev_lock);
1511                 class_decref(target, "find", current);
1512         }
1513         req->rq_status = rc;
1514         RETURN(rc);
1515 }
1516
1517 int target_handle_disconnect(struct ptlrpc_request *req)
1518 {
1519         int rc;
1520
1521         ENTRY;
1522
1523         rc = req_capsule_server_pack(&req->rq_pill);
1524         if (rc)
1525                 RETURN(rc);
1526
1527         /* Keep the rq_export around so we can send the reply. */
1528         req->rq_status = obd_disconnect(class_export_get(req->rq_export));
1529
1530         RETURN(0);
1531 }
1532
1533 void target_destroy_export(struct obd_export *exp)
1534 {
1535         struct obd_import *imp = NULL;
1536         /*
1537          * exports created from last_rcvd data, and "fake"
1538          * exports created by lctl don't have an import
1539          */
1540         spin_lock(&exp->exp_lock);
1541         if (exp->exp_imp_reverse != NULL) {
1542                 imp = exp->exp_imp_reverse;
1543                 exp->exp_imp_reverse = NULL;
1544         }
1545         spin_unlock(&exp->exp_lock);
1546         if (imp != NULL)
1547                 client_destroy_import(imp);
1548
1549         LASSERT_ATOMIC_ZERO(&exp->exp_locks_count);
1550         LASSERT_ATOMIC_ZERO(&exp->exp_rpc_count);
1551         LASSERT_ATOMIC_ZERO(&exp->exp_cb_count);
1552         LASSERT_ATOMIC_ZERO(&exp->exp_replay_count);
1553 }
1554 EXPORT_SYMBOL(target_destroy_export);
1555
1556 /*
1557  * Recovery functions
1558  */
1559 static void target_request_copy_get(struct ptlrpc_request *req)
1560 {
1561         class_export_rpc_inc(req->rq_export);
1562         LASSERT(list_empty(&req->rq_list));
1563         INIT_LIST_HEAD(&req->rq_replay_list);
1564
1565         /* Increase refcount to keep request in queue. */
1566         atomic_inc(&req->rq_refcount);
1567         /* Let export know it has replays to be handled. */
1568         atomic_inc(&req->rq_export->exp_replay_count);
1569 }
1570
1571 static void target_request_copy_put(struct ptlrpc_request *req)
1572 {
1573         LASSERT(list_empty(&req->rq_replay_list));
1574         LASSERT_ATOMIC_POS(&req->rq_export->exp_replay_count);
1575
1576         atomic_dec(&req->rq_export->exp_replay_count);
1577         class_export_rpc_dec(req->rq_export);
1578         ptlrpc_server_drop_request(req);
1579 }
1580
1581 static int target_exp_enqueue_req_replay(struct ptlrpc_request *req)
1582 {
1583         __u64 transno = lustre_msg_get_transno(req->rq_reqmsg);
1584         struct obd_export *exp = req->rq_export;
1585         struct ptlrpc_request *reqiter;
1586         struct ptlrpc_request *dup_req = NULL;
1587         int dup = 0;
1588
1589         LASSERT(exp);
1590
1591         spin_lock(&exp->exp_lock);
1592         list_for_each_entry(reqiter, &exp->exp_req_replay_queue,
1593                             rq_replay_list) {
1594                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) == transno) {
1595                         dup_req = reqiter;
1596                         dup = 1;
1597                         break;
1598                 }
1599         }
1600
1601         if (dup) {
1602                 /* We expect it with RESENT and REPLAY flags. */
1603                 if ((lustre_msg_get_flags(req->rq_reqmsg) &
1604                     (MSG_RESENT | MSG_REPLAY)) != (MSG_RESENT | MSG_REPLAY))
1605                         CERROR("invalid flags %x of resent replay\n",
1606                                lustre_msg_get_flags(req->rq_reqmsg));
1607
1608                 if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY) {
1609                         __u32 new_conn;
1610
1611                         new_conn = lustre_msg_get_conn_cnt(req->rq_reqmsg);
1612                         if (new_conn >
1613                             lustre_msg_get_conn_cnt(dup_req->rq_reqmsg))
1614                                 lustre_msg_set_conn_cnt(dup_req->rq_reqmsg,
1615                                                         new_conn);
1616                 }
1617         } else {
1618                 list_add_tail(&req->rq_replay_list,
1619                               &exp->exp_req_replay_queue);
1620         }
1621
1622         spin_unlock(&exp->exp_lock);
1623         return dup;
1624 }
1625
1626 static void target_exp_dequeue_req_replay(struct ptlrpc_request *req)
1627 {
1628         LASSERT(!list_empty(&req->rq_replay_list));
1629         LASSERT(req->rq_export);
1630
1631         spin_lock(&req->rq_export->exp_lock);
1632         list_del_init(&req->rq_replay_list);
1633         spin_unlock(&req->rq_export->exp_lock);
1634 }
1635
1636 static void target_finish_recovery(struct lu_target *lut)
1637 {
1638         struct obd_device *obd = lut->lut_obd;
1639
1640         ENTRY;
1641
1642         /* Only log a recovery message when recovery has occurred. */
1643         if (obd->obd_recovery_start) {
1644                 time64_t now = ktime_get_seconds();
1645                 time64_t elapsed_time;
1646
1647                 elapsed_time = max_t(time64_t, now - obd->obd_recovery_start,
1648                                      1);
1649                 LCONSOLE_INFO("%s: Recovery over after %lld:%.02lld, of %d clients %d recovered and %d %s evicted.\n",
1650                               obd->obd_name, (s64)elapsed_time / 60,
1651                               (s64)elapsed_time % 60,
1652                               atomic_read(&obd->obd_max_recoverable_clients),
1653                               atomic_read(&obd->obd_connected_clients),
1654                               obd->obd_stale_clients,
1655                               obd->obd_stale_clients == 1 ? "was" : "were");
1656         }
1657
1658         ldlm_reprocess_recovery_done(obd->obd_namespace);
1659         spin_lock(&obd->obd_recovery_task_lock);
1660         if (!list_empty(&obd->obd_req_replay_queue) ||
1661             !list_empty(&obd->obd_lock_replay_queue) ||
1662             !list_empty(&obd->obd_final_req_queue)) {
1663                 CERROR("%s: Recovery queues ( %s%s%s) are not empty\n",
1664                        obd->obd_name,
1665                        list_empty(&obd->obd_req_replay_queue) ? "" : "req ",
1666                        list_empty(&obd->obd_lock_replay_queue) ? \
1667                                   "" : "lock ",
1668                        list_empty(&obd->obd_final_req_queue) ? \
1669                                   "" : "final ");
1670                 spin_unlock(&obd->obd_recovery_task_lock);
1671                 LBUG();
1672         }
1673         spin_unlock(&obd->obd_recovery_task_lock);
1674
1675         obd->obd_recovery_end = ktime_get_seconds();
1676
1677         /* When recovery finished, cleanup orphans on MDS and OST. */
1678         if (obd->obd_type && OBP(obd, postrecov)) {
1679                 int rc = OBP(obd, postrecov)(obd);
1680
1681                 if (rc < 0)
1682                         LCONSOLE_WARN("%s: Post recovery failed, rc %d\n",
1683                                       obd->obd_name, rc);
1684         }
1685         EXIT;
1686 }
1687
1688 static void abort_req_replay_queue(struct obd_device *obd)
1689 {
1690         struct ptlrpc_request *req, *n;
1691         struct list_head abort_list;
1692
1693         INIT_LIST_HEAD(&abort_list);
1694         spin_lock(&obd->obd_recovery_task_lock);
1695         list_splice_init(&obd->obd_req_replay_queue, &abort_list);
1696         spin_unlock(&obd->obd_recovery_task_lock);
1697         list_for_each_entry_safe(req, n, &abort_list, rq_list) {
1698                 DEBUG_REQ(D_WARNING, req, "aborted:");
1699                 req->rq_status = -ENOTCONN;
1700                 if (ptlrpc_error(req)) {
1701                         DEBUG_REQ(D_ERROR, req,
1702                                   "failed abort_req_reply; skipping");
1703                 }
1704                 target_exp_dequeue_req_replay(req);
1705                 target_request_copy_put(req);
1706         }
1707 }
1708
1709 static void abort_lock_replay_queue(struct obd_device *obd)
1710 {
1711         struct ptlrpc_request *req, *n;
1712         struct list_head abort_list;
1713
1714         INIT_LIST_HEAD(&abort_list);
1715         spin_lock(&obd->obd_recovery_task_lock);
1716         list_splice_init(&obd->obd_lock_replay_queue, &abort_list);
1717         spin_unlock(&obd->obd_recovery_task_lock);
1718         list_for_each_entry_safe(req, n, &abort_list, rq_list) {
1719                 DEBUG_REQ(D_ERROR, req, "aborted:");
1720                 req->rq_status = -ENOTCONN;
1721                 if (ptlrpc_error(req)) {
1722                         DEBUG_REQ(D_ERROR, req,
1723                                   "failed abort_lock_reply; skipping");
1724                 }
1725                 target_request_copy_put(req);
1726         }
1727 }
1728
1729 /*
1730  * Called from a cleanup function if the device is being cleaned up
1731  * forcefully.  The exports should all have been disconnected already,
1732  * the only thing left to do is
1733  * - clear the recovery flags
1734  * - cancel the timer
1735  * - free queued requests and replies, but don't send replies
1736  * Because the obd_stopping flag is set, no new requests should be received.
1737  */
1738 void target_cleanup_recovery(struct obd_device *obd)
1739 {
1740         struct ptlrpc_request *req, *n;
1741         struct list_head clean_list;
1742
1743         INIT_LIST_HEAD(&clean_list);
1744         spin_lock(&obd->obd_dev_lock);
1745         if (!obd->obd_recovering) {
1746                 spin_unlock(&obd->obd_dev_lock);
1747                 EXIT;
1748                 return;
1749         }
1750         obd->obd_recovering = obd->obd_abort_recovery = 0;
1751         spin_unlock(&obd->obd_dev_lock);
1752
1753         spin_lock(&obd->obd_recovery_task_lock);
1754         target_cancel_recovery_timer(obd);
1755         list_splice_init(&obd->obd_req_replay_queue, &clean_list);
1756         spin_unlock(&obd->obd_recovery_task_lock);
1757
1758         list_for_each_entry_safe(req, n, &clean_list, rq_list) {
1759                 LASSERT(req->rq_reply_state == NULL);
1760                 target_exp_dequeue_req_replay(req);
1761                 target_request_copy_put(req);
1762         }
1763
1764         spin_lock(&obd->obd_recovery_task_lock);
1765         list_splice_init(&obd->obd_lock_replay_queue, &clean_list);
1766         list_splice_init(&obd->obd_final_req_queue, &clean_list);
1767         spin_unlock(&obd->obd_recovery_task_lock);
1768
1769         list_for_each_entry_safe(req, n, &clean_list, rq_list) {
1770                 LASSERT(req->rq_reply_state == NULL);
1771                 target_request_copy_put(req);
1772         }
1773
1774         EXIT;
1775 }
1776 EXPORT_SYMBOL(target_cleanup_recovery);
1777
1778 /* obd_recovery_task_lock should be held */
1779 void target_cancel_recovery_timer(struct obd_device *obd)
1780 {
1781         CDEBUG(D_HA, "%s: cancel recovery timer\n", obd->obd_name);
1782         hrtimer_cancel(&obd->obd_recovery_timer);
1783 }
1784
1785 static void target_start_recovery_timer(struct obd_device *obd)
1786 {
1787         ktime_t delay;
1788
1789         if (obd->obd_recovery_start != 0)
1790                 return;
1791
1792         spin_lock(&obd->obd_dev_lock);
1793         if (!obd->obd_recovering || obd->obd_abort_recovery) {
1794                 spin_unlock(&obd->obd_dev_lock);
1795                 return;
1796         }
1797
1798         LASSERT(obd->obd_recovery_timeout != 0);
1799
1800         if (obd->obd_recovery_start != 0) {
1801                 spin_unlock(&obd->obd_dev_lock);
1802                 return;
1803         }
1804
1805         obd->obd_recovery_start = ktime_get_seconds();
1806         delay = ktime_set(obd->obd_recovery_start +
1807                           obd->obd_recovery_timeout, 0);
1808         hrtimer_start(&obd->obd_recovery_timer, delay, HRTIMER_MODE_ABS);
1809         spin_unlock(&obd->obd_dev_lock);
1810
1811         LCONSOLE_WARN("%s: Will be in recovery for at least %lu:%02lu, or until %d client%s reconnect%s\n",
1812                       obd->obd_name,
1813                       obd->obd_recovery_timeout / 60,
1814                       obd->obd_recovery_timeout % 60,
1815                       atomic_read(&obd->obd_max_recoverable_clients),
1816                       (atomic_read(&obd->obd_max_recoverable_clients) == 1) ?
1817                       "" : "s",
1818                       (atomic_read(&obd->obd_max_recoverable_clients) == 1) ?
1819                       "s" : "");
1820 }
1821
1822 /**
1823  * extend recovery window.
1824  *
1825  * if @extend is true, extend recovery window to have @dr_timeout remaining
1826  * at least; otherwise, make sure the recovery timeout value is not less
1827  * than @dr_timeout.
1828  */
1829 static void extend_recovery_timer(struct obd_device *obd, time_t dr_timeout,
1830                                   bool extend)
1831 {
1832         ktime_t left_ns;
1833         time_t timeout;
1834         time_t left;
1835
1836         spin_lock(&obd->obd_dev_lock);
1837         if (!obd->obd_recovering || obd->obd_abort_recovery ||
1838             obd->obd_stopping) {
1839                 spin_unlock(&obd->obd_dev_lock);
1840                 return;
1841         }
1842         LASSERT(obd->obd_recovery_start != 0);
1843
1844         left_ns = hrtimer_expires_remaining(&obd->obd_recovery_timer);
1845         left = ktime_divns(left_ns, NSEC_PER_SEC);
1846
1847         if (extend) {
1848                 timeout = obd->obd_recovery_timeout;
1849                 /* dr_timeout will happen after the hrtimer has expired.
1850                  * Add the excess time to the soft recovery timeout without
1851                  * exceeding the hard recovery timeout.
1852                  */
1853                 if (dr_timeout > left) {
1854                         timeout += dr_timeout - left;
1855                         timeout = min_t(time_t, obd->obd_recovery_time_hard,
1856                                         timeout);
1857                 }
1858         } else {
1859                 timeout = clamp_t(time_t, dr_timeout, obd->obd_recovery_timeout,
1860                                   obd->obd_recovery_time_hard);
1861         }
1862
1863         if (timeout == obd->obd_recovery_time_hard)
1864                 CWARN("%s: extended recovery timer reached hard limit: %ld, extend: %d\n",
1865                       obd->obd_name, timeout, extend);
1866
1867         if (obd->obd_recovery_timeout < timeout) {
1868                 ktime_t end, now;
1869
1870                 obd->obd_recovery_timeout = timeout;
1871                 end = ktime_set(obd->obd_recovery_start + timeout, 0);
1872                 now = ktime_set(ktime_get_seconds(), 0);
1873                 left_ns = ktime_sub(end, now);
1874                 hrtimer_start(&obd->obd_recovery_timer, end, HRTIMER_MODE_ABS);
1875                 left = ktime_divns(left_ns, NSEC_PER_SEC);
1876         }
1877         spin_unlock(&obd->obd_dev_lock);
1878
1879         CDEBUG(D_HA, "%s: recovery timer will expire in %ld seconds\n",
1880                 obd->obd_name, left);
1881 }
1882
1883 /* Reset the timer with each new client connection */
1884 /*
1885  * This timer is actually reconnect_timer, which is for making sure
1886  * the total recovery window is at least as big as my reconnect
1887  * attempt timing. So the initial recovery time_out will be set to
1888  * OBD_RECOVERY_FACTOR * obd_timeout. If the timeout coming
1889  * from client is bigger than this, then the recovery time_out will
1890  * be extended to make sure the client could be reconnected, in the
1891  * process, the timeout from the new client should be ignored.
1892  */
1893 static void
1894 check_and_start_recovery_timer(struct obd_device *obd,
1895                                struct ptlrpc_request *req,
1896                                int new_client)
1897 {
1898         time_t service_time = lustre_msg_get_service_time(req->rq_reqmsg);
1899         struct obd_device_target *obt = &obd->u.obt;
1900
1901         if (!new_client && service_time)
1902                 /*
1903                  * Teach server about old server's estimates, as first guess
1904                  * at how long new requests will take.
1905                  */
1906                 at_measured(&req->rq_rqbd->rqbd_svcpt->scp_at_estimate,
1907                             service_time);
1908
1909         target_start_recovery_timer(obd);
1910
1911         /*
1912          * Convert the service time to RPC timeout,
1913          * and reuse service_time to limit stack usage.
1914          */
1915         service_time = at_est2timeout(service_time);
1916
1917         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_SLUGGISH_NET) &&
1918             service_time < at_extra)
1919                 service_time = at_extra;
1920
1921         /*
1922          * We expect other clients to timeout within service_time, then try
1923          * to reconnect, then try the failover server.  The max delay between
1924          * connect attempts is SWITCH_MAX + SWITCH_INC + INITIAL.
1925          */
1926         service_time += 2 * INITIAL_CONNECT_TIMEOUT;
1927
1928         LASSERT(obt->obt_magic == OBT_MAGIC);
1929         service_time += 2 * (CONNECTION_SWITCH_MAX + CONNECTION_SWITCH_INC);
1930         if (service_time > obd->obd_recovery_timeout && !new_client)
1931                 extend_recovery_timer(obd, service_time, false);
1932 }
1933
1934 /** Health checking routines */
1935 static inline int exp_connect_healthy(struct obd_export *exp)
1936 {
1937         return exp->exp_in_recovery;
1938 }
1939
1940 /** if export done req_replay or has replay in queue */
1941 static inline int exp_req_replay_healthy(struct obd_export *exp)
1942 {
1943         return (!exp->exp_req_replay_needed ||
1944                 atomic_read(&exp->exp_replay_count) > 0);
1945 }
1946
1947
1948 static inline int exp_req_replay_healthy_or_from_mdt(struct obd_export *exp)
1949 {
1950         return (exp_connect_flags(exp) & OBD_CONNECT_MDS_MDS) ||
1951                exp_req_replay_healthy(exp);
1952 }
1953
1954 /** if export done lock_replay or has replay in queue */
1955 static inline int exp_lock_replay_healthy(struct obd_export *exp)
1956 {
1957         return (!exp->exp_lock_replay_needed ||
1958                 atomic_read(&exp->exp_replay_count) > 0);
1959 }
1960
1961 static inline int exp_vbr_healthy(struct obd_export *exp)
1962 {
1963         return !exp->exp_vbr_failed;
1964 }
1965
1966 static inline int exp_finished(struct obd_export *exp)
1967 {
1968         return exp->exp_in_recovery && !exp->exp_lock_replay_needed;
1969 }
1970
1971 static inline int exp_finished_or_from_mdt(struct obd_export *exp)
1972 {
1973         return (exp_connect_flags(exp) & OBD_CONNECT_MDS_MDS) ||
1974                 exp_finished(exp);
1975 }
1976
1977 static int check_for_next_transno(struct lu_target *lut)
1978 {
1979         struct ptlrpc_request *req = NULL;
1980         struct obd_device *obd = lut->lut_obd;
1981         struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
1982         int wake_up = 0, connected, completed, queue_len;
1983         __u64 req_transno = 0;
1984         __u64 update_transno = 0;
1985         __u64 next_transno = 0;
1986
1987         ENTRY;
1988
1989         spin_lock(&obd->obd_recovery_task_lock);
1990         if (!list_empty(&obd->obd_req_replay_queue)) {
1991                 req = list_entry(obd->obd_req_replay_queue.next,
1992                                      struct ptlrpc_request, rq_list);
1993                 req_transno = lustre_msg_get_transno(req->rq_reqmsg);
1994         }
1995
1996         if (tdtd != NULL)
1997                 update_transno = distribute_txn_get_next_transno(tdtd);
1998
1999         connected = atomic_read(&obd->obd_connected_clients);
2000         completed = connected - atomic_read(&obd->obd_req_replay_clients);
2001         queue_len = obd->obd_requests_queued_for_recovery;
2002         next_transno = obd->obd_next_recovery_transno;
2003
2004         CDEBUG(D_HA,
2005                "max: %d, connected: %d, completed: %d, queue_len: %d, req_transno: %llu, next_transno: %llu\n",
2006                atomic_read(&obd->obd_max_recoverable_clients),
2007                connected, completed,
2008                queue_len, req_transno, next_transno);
2009
2010         if (obd->obd_abort_recovery) {
2011                 CDEBUG(D_HA, "waking for aborted recovery\n");
2012                 wake_up = 1;
2013         } else if (obd->obd_recovery_expired) {
2014                 CDEBUG(D_HA, "waking for expired recovery\n");
2015                 wake_up = 1;
2016         } else if (tdtd != NULL && req != NULL &&
2017                    is_req_replayed_by_update(req)) {
2018                 LASSERTF(req_transno < next_transno,
2019                          "req_transno %llu next_transno%llu\n", req_transno,
2020                          next_transno);
2021                 CDEBUG(D_HA, "waking for duplicate req (%llu)\n",
2022                        req_transno);
2023                 wake_up = 1;
2024         } else if (req_transno == next_transno ||
2025                    (update_transno != 0 && update_transno <= next_transno)) {
2026                 CDEBUG(D_HA, "waking for next (%lld)\n", next_transno);
2027                 wake_up = 1;
2028         } else if (queue_len > 0 &&
2029                    queue_len == atomic_read(&obd->obd_req_replay_clients)) {
2030                 /** handle gaps occured due to lost reply or VBR */
2031                 LASSERTF(req_transno >= next_transno,
2032                          "req_transno: %llu, next_transno: %llu\n",
2033                          req_transno, next_transno);
2034                 CDEBUG(D_HA,
2035                        "%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",
2036                        obd->obd_name, obd->obd_version_recov ? "ON" : "OFF",
2037                        next_transno, queue_len, completed, connected,
2038                        req_transno, update_transno, obd->obd_last_committed);
2039                 obd->obd_next_recovery_transno = req_transno;
2040                 wake_up = 1;
2041         } else if (atomic_read(&obd->obd_req_replay_clients) == 0) {
2042                 CDEBUG(D_HA, "waking for completed recovery\n");
2043                 wake_up = 1;
2044         } else if (OBD_FAIL_CHECK(OBD_FAIL_MDS_RECOVERY_ACCEPTS_GAPS)) {
2045                 CDEBUG(D_HA,
2046                        "accepting transno gaps is explicitly allowed by fail_lock, waking up (%lld)\n",
2047                        next_transno);
2048                 obd->obd_next_recovery_transno = req_transno;
2049                 wake_up = 1;
2050         }
2051         spin_unlock(&obd->obd_recovery_task_lock);
2052         return wake_up;
2053 }
2054
2055 static int check_for_next_lock(struct lu_target *lut)
2056 {
2057         struct obd_device *obd = lut->lut_obd;
2058         int wake_up = 0;
2059
2060         spin_lock(&obd->obd_recovery_task_lock);
2061         if (!list_empty(&obd->obd_lock_replay_queue)) {
2062                 CDEBUG(D_HA, "waking for next lock\n");
2063                 wake_up = 1;
2064         } else if (atomic_read(&obd->obd_lock_replay_clients) == 0) {
2065                 CDEBUG(D_HA, "waking for completed lock replay\n");
2066                 wake_up = 1;
2067         } else if (obd->obd_abort_recovery) {
2068                 CDEBUG(D_HA, "waking for aborted recovery\n");
2069                 wake_up = 1;
2070         } else if (obd->obd_recovery_expired) {
2071                 CDEBUG(D_HA, "waking for expired recovery\n");
2072                 wake_up = 1;
2073         }
2074         spin_unlock(&obd->obd_recovery_task_lock);
2075
2076         return wake_up;
2077 }
2078
2079 /**
2080  * wait for recovery events,
2081  * check its status with help of check_routine
2082  * evict dead clients via health_check
2083  */
2084 static int target_recovery_overseer(struct lu_target *lut,
2085                                     int (*check_routine)(struct lu_target *),
2086                                     int (*health_check)(struct obd_export *))
2087 {
2088         struct obd_device *obd = lut->lut_obd;
2089         struct target_distribute_txn_data *tdtd;
2090         time64_t last = 0;
2091         time64_t now;
2092 repeat:
2093         if (obd->obd_recovering && obd->obd_recovery_start == 0) {
2094                 now = ktime_get_seconds();
2095                 if (now - last > 600) {
2096                         LCONSOLE_INFO("%s: in recovery but waiting for the first client to connect\n",
2097                                       obd->obd_name);
2098                         last = now;
2099                 }
2100         }
2101         if (obd->obd_recovery_start != 0 && ktime_get_seconds() >=
2102               (obd->obd_recovery_start + obd->obd_recovery_time_hard)) {
2103                 __u64 next_update_transno = 0;
2104
2105                 /*
2106                  * Only abort the recovery if there are no update recovery
2107                  * left in the queue
2108                  */
2109                 spin_lock(&obd->obd_recovery_task_lock);
2110                 if (lut->lut_tdtd != NULL) {
2111                         next_update_transno =
2112                                 distribute_txn_get_next_transno(lut->lut_tdtd);
2113
2114                         tdtd = lut->lut_tdtd;
2115                         /*
2116                          * If next_update_transno == 0, it probably because
2117                          * updatelog retrieve threads did not get any records
2118                          * yet, let's wait those threads stopped
2119                          */
2120                         if (next_update_transno == 0) {
2121                                 spin_unlock(&obd->obd_recovery_task_lock);
2122                                 wait_event_idle(
2123                                         tdtd->tdtd_recovery_threads_waitq,
2124                                         atomic_read(&tdtd->tdtd_recovery_threads_count)
2125                                         == 0);
2126
2127                                 spin_lock(&obd->obd_recovery_task_lock);
2128                                 next_update_transno =
2129                                         distribute_txn_get_next_transno(
2130                                                                 lut->lut_tdtd);
2131                         }
2132                 }
2133
2134                 if (next_update_transno != 0 && !obd->obd_abort_recovery) {
2135                         obd->obd_next_recovery_transno = next_update_transno;
2136                         spin_unlock(&obd->obd_recovery_task_lock);
2137                         /*
2138                          * Disconnect unfinished exports from clients, and
2139                          * keep connection from MDT to make sure the update
2140                          * recovery will still keep trying until some one
2141                          * manually abort the recovery
2142                          */
2143                         class_disconnect_stale_exports(obd,
2144                                                 exp_finished_or_from_mdt);
2145                         /* Abort all of replay & replay lock req from clients */
2146                         abort_req_replay_queue(obd);
2147                         abort_lock_replay_queue(obd);
2148                         CDEBUG(D_HA,
2149                                "%s: there are still update replay (%#llx)in the queue.\n",
2150                                obd->obd_name, next_update_transno);
2151                 } else {
2152                         obd->obd_abort_recovery = 1;
2153                         spin_unlock(&obd->obd_recovery_task_lock);
2154                         CWARN("%s recovery is aborted by hard timeout\n",
2155                               obd->obd_name);
2156                 }
2157         }
2158
2159         while (wait_event_timeout(obd->obd_next_transno_waitq,
2160                                   check_routine(lut),
2161                                   cfs_time_seconds(60)) == 0)
2162                 ; /* wait indefinitely for event, but don't trigger watchdog */
2163
2164         if (obd->obd_abort_recovery) {
2165                 CWARN("recovery is aborted, evict exports in recovery\n");
2166                 if (lut->lut_tdtd != NULL) {
2167                         tdtd = lut->lut_tdtd;
2168                         /*
2169                          * Let's wait all of the update log recovery thread
2170                          * finished
2171                          */
2172                         wait_event_idle(
2173                                 tdtd->tdtd_recovery_threads_waitq,
2174                                 atomic_read(&tdtd->tdtd_recovery_threads_count)
2175                                 == 0);
2176                         /* Then abort the update recovery list */
2177                         dtrq_list_destroy(lut->lut_tdtd);
2178                 }
2179
2180                 /** evict exports which didn't finish recovery yet */
2181                 class_disconnect_stale_exports(obd, exp_finished);
2182                 return 1;
2183         } else if (obd->obd_recovery_expired &&
2184                    obd->obd_recovery_timeout < obd->obd_recovery_time_hard) {
2185                 obd->obd_recovery_expired = 0;
2186
2187                 /** If some clients died being recovered, evict them */
2188                 LCONSOLE_WARN("%s: recovery is timed out, evict stale exports\n",
2189                               obd->obd_name);
2190                 /** evict cexports with no replay in queue, they are stalled */
2191                 class_disconnect_stale_exports(obd, health_check);
2192
2193                 /** continue with VBR */
2194                 spin_lock(&obd->obd_dev_lock);
2195                 obd->obd_version_recov = 1;
2196                 spin_unlock(&obd->obd_dev_lock);
2197                 /**
2198                  * reset timer, recovery will proceed with versions now,
2199                  * timeout is set just to handle reconnection delays
2200                  */
2201                 extend_recovery_timer(obd, RECONNECT_DELAY_MAX, true);
2202                 /**
2203                  * Wait for recovery events again, after evicting bad clients
2204                  */
2205                 goto repeat;
2206         }
2207         return 0;
2208 }
2209
2210 static struct ptlrpc_request *target_next_replay_lock(struct lu_target *lut)
2211 {
2212         struct obd_device *obd = lut->lut_obd;
2213         struct ptlrpc_request *req = NULL;
2214
2215         CDEBUG(D_HA, "Waiting for lock\n");
2216         if (target_recovery_overseer(lut, check_for_next_lock,
2217                                      exp_lock_replay_healthy))
2218                 abort_lock_replay_queue(obd);
2219
2220         spin_lock(&obd->obd_recovery_task_lock);
2221         if (!list_empty(&obd->obd_lock_replay_queue)) {
2222                 req = list_entry(obd->obd_lock_replay_queue.next,
2223                                      struct ptlrpc_request, rq_list);
2224                 list_del_init(&req->rq_list);
2225                 spin_unlock(&obd->obd_recovery_task_lock);
2226         } else {
2227                 spin_unlock(&obd->obd_recovery_task_lock);
2228                 LASSERT(list_empty(&obd->obd_lock_replay_queue));
2229                 LASSERT(atomic_read(&obd->obd_lock_replay_clients) == 0);
2230                 /** evict exports failed VBR */
2231                 class_disconnect_stale_exports(obd, exp_vbr_healthy);
2232         }
2233         return req;
2234 }
2235
2236 static struct ptlrpc_request *target_next_final_ping(struct obd_device *obd)
2237 {
2238         struct ptlrpc_request *req = NULL;
2239
2240         spin_lock(&obd->obd_recovery_task_lock);
2241         if (!list_empty(&obd->obd_final_req_queue)) {
2242                 req = list_entry(obd->obd_final_req_queue.next,
2243                                      struct ptlrpc_request, rq_list);
2244                 list_del_init(&req->rq_list);
2245                 spin_unlock(&obd->obd_recovery_task_lock);
2246                 if (req->rq_export->exp_in_recovery) {
2247                         spin_lock(&req->rq_export->exp_lock);
2248                         req->rq_export->exp_in_recovery = 0;
2249                         spin_unlock(&req->rq_export->exp_lock);
2250                 }
2251         } else {
2252                 spin_unlock(&obd->obd_recovery_task_lock);
2253         }
2254         return req;
2255 }
2256
2257 static void handle_recovery_req(struct ptlrpc_thread *thread,
2258                                 struct ptlrpc_request *req,
2259                                 svc_handler_t handler)
2260 {
2261         ENTRY;
2262
2263         /**
2264          * export can be evicted during recovery, no need to handle replays for
2265          * it after that, discard such request silently
2266          */
2267         if (req->rq_export->exp_disconnected)
2268                 RETURN_EXIT;
2269
2270         req->rq_session.lc_thread = thread;
2271         req->rq_svc_thread = thread;
2272         req->rq_svc_thread->t_env->le_ses = &req->rq_session;
2273
2274         /* thread context */
2275         lu_context_enter(&thread->t_env->le_ctx);
2276         (void)handler(req);
2277         lu_context_exit(&thread->t_env->le_ctx);
2278
2279         req->rq_svc_thread->t_env->le_ses = NULL;
2280
2281         /* don't reset timer for final stage */
2282         if (!exp_finished(req->rq_export)) {
2283                 time_t to = obd_timeout;
2284
2285                 /**
2286                  * Add request timeout to the recovery time so next request from
2287                  * this client may come in recovery time
2288                  */
2289                 if (!AT_OFF) {
2290                         struct ptlrpc_service_part *svcpt;
2291
2292                         svcpt = req->rq_rqbd->rqbd_svcpt;
2293                         /*
2294                          * If the server sent early reply for this request,
2295                          * the client will recalculate the timeout according to
2296                          * current server estimate service time, so we will
2297                          * use the maxium timeout here for waiting the client
2298                          * sending the next req
2299                          */
2300                         to = max_t(time_t,
2301                                    at_est2timeout(at_get(&svcpt->scp_at_estimate)),
2302                                    lustre_msg_get_timeout(req->rq_reqmsg));
2303                         /*
2304                          * Add 2 net_latency, one for balance rq_deadline
2305                          * (see ptl_send_rpc), one for resend the req to server,
2306                          * Note: client will pack net_latency in replay req
2307                          * (see ptlrpc_replay_req)
2308                          */
2309                         to += 2 * lustre_msg_get_service_time(req->rq_reqmsg);
2310                 }
2311                 extend_recovery_timer(class_exp2obd(req->rq_export), to, true);
2312         }
2313         EXIT;
2314 }
2315
2316 /** Checking routines for recovery */
2317 static int check_for_recovery_ready(struct lu_target *lut)
2318 {
2319         struct obd_device *obd = lut->lut_obd;
2320         unsigned int clnts = atomic_read(&obd->obd_connected_clients);
2321
2322         CDEBUG(D_HA,
2323                "connected %d stale %d max_recoverable_clients %d abort %d expired %d\n",
2324                clnts, obd->obd_stale_clients,
2325                atomic_read(&obd->obd_max_recoverable_clients),
2326                obd->obd_abort_recovery, obd->obd_recovery_expired);
2327
2328         if (!obd->obd_abort_recovery && !obd->obd_recovery_expired) {
2329                 LASSERT(clnts <=
2330                         atomic_read(&obd->obd_max_recoverable_clients));
2331                 if (clnts + obd->obd_stale_clients <
2332                     atomic_read(&obd->obd_max_recoverable_clients))
2333                         return 0;
2334         }
2335
2336         if (lut->lut_tdtd != NULL) {
2337                 if (!lut->lut_tdtd->tdtd_replay_ready &&
2338                     !obd->obd_abort_recovery && !obd->obd_stopping) {
2339                         /*
2340                          * Let's extend recovery timer, in case the recovery
2341                          * timer expired, and some clients got evicted
2342                          */
2343                         extend_recovery_timer(obd, obd->obd_recovery_timeout,
2344                                               true);
2345                         CDEBUG(D_HA,
2346                                "%s update recovery is not ready, extend recovery %lu\n",
2347                                obd->obd_name, obd->obd_recovery_timeout);
2348                         return 0;
2349                 }
2350         }
2351
2352         return 1;
2353 }
2354
2355 enum {
2356         REQUEST_RECOVERY = 1,
2357         UPDATE_RECOVERY = 2,
2358 };
2359
2360 static __u64 get_next_replay_req_transno(struct obd_device *obd)
2361 {
2362         __u64 transno = 0;
2363
2364         if (!list_empty(&obd->obd_req_replay_queue)) {
2365                 struct ptlrpc_request *req;
2366
2367                 req = list_entry(obd->obd_req_replay_queue.next,
2368                                  struct ptlrpc_request, rq_list);
2369                 transno = lustre_msg_get_transno(req->rq_reqmsg);
2370         }
2371
2372         return transno;
2373 }
2374
2375 static __u64 get_next_transno(struct lu_target *lut, int *type)
2376 {
2377         struct obd_device *obd = lut->lut_obd;
2378         struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
2379         __u64 transno = 0;
2380         __u64 update_transno;
2381
2382         ENTRY;
2383
2384         transno = get_next_replay_req_transno(obd);
2385         if (type != NULL)
2386                 *type = REQUEST_RECOVERY;
2387
2388         if (tdtd == NULL)
2389                 RETURN(transno);
2390
2391         update_transno = distribute_txn_get_next_transno(tdtd);
2392         if (transno == 0 || (transno >= update_transno &&
2393                              update_transno != 0)) {
2394                 transno = update_transno;
2395                 if (type != NULL)
2396                         *type = UPDATE_RECOVERY;
2397         }
2398
2399         RETURN(transno);
2400 }
2401
2402 /**
2403  * drop duplicate replay request
2404  *
2405  * Because the operation has been replayed by update recovery, the request
2406  * with the same transno will be dropped and also notify the client to send
2407  * next replay request.
2408  *
2409  * \param[in] env       execution environment
2410  * \param[in] obd       failover obd device
2411  * \param[in] req       request to be dropped
2412  */
2413 static void drop_duplicate_replay_req(struct lu_env *env,
2414                                       struct obd_device *obd,
2415                                       struct ptlrpc_request *req)
2416 {
2417         DEBUG_REQ(D_HA, req,
2418                   "remove t%lld from %s because duplicate update records found",
2419                   lustre_msg_get_transno(req->rq_reqmsg),
2420                   libcfs_nid2str(req->rq_peer.nid));
2421
2422         /*
2423          * Right now, only for MDS reint operation update replay and
2424          * normal request replay can have the same transno
2425          */
2426         if (lustre_msg_get_opc(req->rq_reqmsg) == MDS_REINT) {
2427                 req_capsule_set(&req->rq_pill, &RQF_MDS_REINT);
2428                 req->rq_status = req_capsule_server_pack(&req->rq_pill);
2429                 if (likely(req->rq_export))
2430                         target_committed_to_req(req);
2431                 lustre_msg_set_transno(req->rq_repmsg, req->rq_transno);
2432                 target_send_reply(req, req->rq_status, 0);
2433         } else {
2434                 DEBUG_REQ(D_ERROR, req, "wrong opc from %s",
2435                 libcfs_nid2str(req->rq_peer.nid));
2436         }
2437         target_exp_dequeue_req_replay(req);
2438         target_request_copy_put(req);
2439         obd->obd_replayed_requests++;
2440 }
2441
2442 static void replay_request_or_update(struct lu_env *env,
2443                                      struct lu_target *lut,
2444                                      struct target_recovery_data *trd,
2445                                      struct ptlrpc_thread *thread)
2446 {
2447         struct obd_device *obd = lut->lut_obd;
2448         struct ptlrpc_request *req = NULL;
2449         int type;
2450         __u64 transno;
2451
2452         ENTRY;
2453
2454         CDEBUG(D_HA, "Waiting for transno %lld\n",
2455                obd->obd_next_recovery_transno);
2456
2457         /* Replay all of request and update by transno */
2458         do {
2459                 struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
2460
2461                 CFS_FAIL_TIMEOUT(OBD_FAIL_TGT_REPLAY_DELAY2, cfs_fail_val);
2462
2463                 /**
2464                  * It is needed to extend recovery window above
2465                  *  recovery_time_soft. Extending is possible only in the
2466                  *  end of recovery window (see more details in
2467                  *  handle_recovery_req()).
2468                  */
2469                 CFS_FAIL_TIMEOUT_MS(OBD_FAIL_TGT_REPLAY_DELAY, 300);
2470
2471                 if (target_recovery_overseer(lut, check_for_next_transno,
2472                                         exp_req_replay_healthy_or_from_mdt)) {
2473                         abort_req_replay_queue(obd);
2474                         abort_lock_replay_queue(obd);
2475                         goto abort;
2476                 }
2477
2478                 spin_lock(&obd->obd_recovery_task_lock);
2479                 transno = get_next_transno(lut, &type);
2480                 if (type == REQUEST_RECOVERY && transno != 0) {
2481                         /*
2482                          * Drop replay request from client side, if the
2483                          * replay has been executed by update with the
2484                          * same transno
2485                          */
2486                         req = list_entry(obd->obd_req_replay_queue.next,
2487                                         struct ptlrpc_request, rq_list);
2488
2489                         list_del_init(&req->rq_list);
2490                         obd->obd_requests_queued_for_recovery--;
2491                         spin_unlock(&obd->obd_recovery_task_lock);
2492
2493                         /*
2494                          * Let's check if the request has been redone by
2495                          * update replay
2496                          */
2497                         if (is_req_replayed_by_update(req)) {
2498                                 struct distribute_txn_replay_req *dtrq;
2499
2500                                 dtrq = distribute_txn_lookup_finish_list(tdtd,
2501                                                                       transno);
2502                                 LASSERT(dtrq != NULL);
2503                                 spin_lock(&tdtd->tdtd_replay_list_lock);
2504                                 list_del_init(&dtrq->dtrq_list);
2505                                 spin_unlock(&tdtd->tdtd_replay_list_lock);
2506                                 dtrq_destroy(dtrq);
2507
2508                                 drop_duplicate_replay_req(env, obd, req);
2509
2510                                 continue;
2511                         }
2512
2513                         LASSERT(trd->trd_processing_task == current_pid());
2514                         DEBUG_REQ(D_HA, req, "processing x%llu t%lld from %s",
2515                                   req->rq_xid,
2516                                   lustre_msg_get_transno(req->rq_reqmsg),
2517                                   libcfs_nid2str(req->rq_peer.nid));
2518
2519                         handle_recovery_req(thread, req,
2520                                             trd->trd_recovery_handler);
2521                         /**
2522                          * bz18031: increase next_recovery_transno before
2523                          * target_request_copy_put() will drop exp_rpc reference
2524                          */
2525                         spin_lock(&obd->obd_recovery_task_lock);
2526                         obd->obd_next_recovery_transno++;
2527                         spin_unlock(&obd->obd_recovery_task_lock);
2528                         target_exp_dequeue_req_replay(req);
2529                         target_request_copy_put(req);
2530                         obd->obd_replayed_requests++;
2531                 } else if (type == UPDATE_RECOVERY && transno != 0) {
2532                         struct distribute_txn_replay_req *dtrq;
2533                         int rc;
2534
2535                         spin_unlock(&obd->obd_recovery_task_lock);
2536
2537                         LASSERT(tdtd != NULL);
2538                         dtrq = distribute_txn_get_next_req(tdtd);
2539                         lu_context_enter(&thread->t_env->le_ctx);
2540                         rc = tdtd->tdtd_replay_handler(env, tdtd, dtrq);
2541                         lu_context_exit(&thread->t_env->le_ctx);
2542                         extend_recovery_timer(obd, obd_timeout, true);
2543
2544                         if (rc == 0 && dtrq->dtrq_xid != 0) {
2545                                 CDEBUG(D_HA,
2546                                        "Move x%llu t%llu to finish list\n",
2547                                        dtrq->dtrq_xid,
2548                                        dtrq->dtrq_master_transno);
2549
2550                                 /* Add it to the replay finish list */
2551                                 spin_lock(&tdtd->tdtd_replay_list_lock);
2552                                 list_add(&dtrq->dtrq_list,
2553                                          &tdtd->tdtd_replay_finish_list);
2554                                 spin_unlock(&tdtd->tdtd_replay_list_lock);
2555
2556                                 spin_lock(&obd->obd_recovery_task_lock);
2557                                 if (transno == obd->obd_next_recovery_transno)
2558                                         obd->obd_next_recovery_transno++;
2559                                 else if (transno >
2560                                          obd->obd_next_recovery_transno)
2561                                         obd->obd_next_recovery_transno =
2562                                                                 transno + 1;
2563                                 spin_unlock(&obd->obd_recovery_task_lock);
2564                         } else {
2565                                 dtrq_destroy(dtrq);
2566                         }
2567                 } else {
2568                         spin_unlock(&obd->obd_recovery_task_lock);
2569 abort:
2570                         LASSERT(list_empty(&obd->obd_req_replay_queue));
2571                         LASSERT(atomic_read(&obd->obd_req_replay_clients) == 0);
2572                         /** evict exports failed VBR */
2573                         class_disconnect_stale_exports(obd, exp_vbr_healthy);
2574                         break;
2575                 }
2576         } while (1);
2577 }
2578
2579 static int target_recovery_thread(void *arg)
2580 {
2581         struct lu_target *lut = arg;
2582         struct obd_device *obd = lut->lut_obd;
2583         struct ptlrpc_request *req;
2584         struct target_recovery_data *trd = &obd->obd_recovery_data;
2585         unsigned long delta;
2586         struct lu_env *env;
2587         struct ptlrpc_thread *thread = NULL;
2588         int rc = 0;
2589
2590         ENTRY;
2591
2592         unshare_fs_struct();
2593         OBD_ALLOC_PTR(thread);
2594         if (thread == NULL)
2595                 RETURN(-ENOMEM);
2596
2597         OBD_ALLOC_PTR(env);
2598         if (env == NULL)
2599                 GOTO(out_thread, rc = -ENOMEM);
2600         rc = lu_env_add(env);
2601         if (rc)
2602                 GOTO(out_env, rc);
2603
2604         rc = lu_context_init(&env->le_ctx, LCT_MD_THREAD | LCT_DT_THREAD);
2605         if (rc)
2606                 GOTO(out_env_remove, rc);
2607
2608         thread->t_env = env;
2609         thread->t_id = -1; /* force filter_iobuf_get/put to use local buffers */
2610         env->le_ctx.lc_thread = thread;
2611         tgt_io_thread_init(thread); /* init thread_big_cache for IO requests */
2612
2613         CDEBUG(D_HA, "%s: started recovery thread pid %d\n", obd->obd_name,
2614                current_pid());
2615         trd->trd_processing_task = current_pid();
2616
2617         spin_lock(&obd->obd_dev_lock);
2618         obd->obd_recovering = 1;
2619         spin_unlock(&obd->obd_dev_lock);
2620         complete(&trd->trd_starting);
2621
2622         /* first of all, we have to know the first transno to replay */
2623         if (target_recovery_overseer(lut, check_for_recovery_ready,
2624                                      exp_connect_healthy)) {
2625                 abort_req_replay_queue(obd);
2626                 abort_lock_replay_queue(obd);
2627                 if (lut->lut_tdtd != NULL)
2628                         dtrq_list_destroy(lut->lut_tdtd);
2629         }
2630
2631         /* next stage: replay requests or update */
2632         delta = jiffies;
2633         CDEBUG(D_INFO, "1: request replay stage - %d clients from t%llu\n",
2634                atomic_read(&obd->obd_req_replay_clients),
2635                obd->obd_next_recovery_transno);
2636         replay_request_or_update(env, lut, trd, thread);
2637
2638         /**
2639          * The second stage: replay locks
2640          */
2641         CDEBUG(D_INFO, "2: lock replay stage - %d clients\n",
2642                atomic_read(&obd->obd_lock_replay_clients));
2643         while ((req = target_next_replay_lock(lut))) {
2644                 LASSERT(trd->trd_processing_task == current_pid());
2645                 DEBUG_REQ(D_HA, req, "processing lock from %s:",
2646                           libcfs_nid2str(req->rq_peer.nid));
2647                 handle_recovery_req(thread, req,
2648                                     trd->trd_recovery_handler);
2649                 target_request_copy_put(req);
2650                 obd->obd_replayed_locks++;
2651         }
2652
2653         /**
2654          * The third stage: reply on final pings, at this moment all clients
2655          * must have request in final queue
2656          */
2657         CFS_FAIL_TIMEOUT(OBD_FAIL_TGT_REPLAY_RECONNECT, cfs_fail_val);
2658         CDEBUG(D_INFO, "3: final stage - process recovery completion pings\n");
2659         /** Update server last boot epoch */
2660         tgt_boot_epoch_update(lut);
2661         /*
2662          * We drop recoverying flag to forward all new requests
2663          * to regular mds_handle() since now
2664          */
2665         spin_lock(&obd->obd_dev_lock);
2666         obd->obd_recovering = obd->obd_abort_recovery = 0;
2667         spin_unlock(&obd->obd_dev_lock);
2668         spin_lock(&obd->obd_recovery_task_lock);
2669         target_cancel_recovery_timer(obd);
2670         spin_unlock(&obd->obd_recovery_task_lock);
2671         while ((req = target_next_final_ping(obd))) {
2672                 LASSERT(trd->trd_processing_task == current_pid());
2673                 DEBUG_REQ(D_HA, req, "processing final ping from %s:",
2674                           libcfs_nid2str(req->rq_peer.nid));
2675                 handle_recovery_req(thread, req,
2676                                     trd->trd_recovery_handler);
2677                 /*
2678                  * Because the waiting client can not send ping to server,
2679                  * so we need refresh the last_request_time, to avoid the
2680                  * export is being evicted
2681                  */
2682                 ptlrpc_update_export_timer(req->rq_export, 0);
2683                 target_request_copy_put(req);
2684         }
2685
2686         delta = jiffies_to_msecs(jiffies - delta) / MSEC_PER_SEC;
2687         CDEBUG(D_INFO, "4: recovery completed in %lus - %d/%d reqs/locks\n",
2688                delta, obd->obd_replayed_requests, obd->obd_replayed_locks);
2689         if (delta > OBD_RECOVERY_TIME_SOFT) {
2690                 CWARN("too long recovery - read logs\n");
2691                 libcfs_debug_dumplog();
2692         }
2693
2694         target_finish_recovery(lut);
2695         lu_context_fini(&env->le_ctx);
2696         trd->trd_processing_task = 0;
2697         complete_all(&trd->trd_finishing);
2698         tgt_io_thread_done(thread);
2699 out_env_remove:
2700         lu_env_remove(env);
2701 out_env:
2702         OBD_FREE_PTR(env);
2703 out_thread:
2704         OBD_FREE_PTR(thread);
2705         RETURN(rc);
2706 }
2707
2708 static int target_start_recovery_thread(struct lu_target *lut,
2709                                         svc_handler_t handler)
2710 {
2711         struct obd_device *obd = lut->lut_obd;
2712         int rc = 0;
2713         struct target_recovery_data *trd = &obd->obd_recovery_data;
2714         int index;
2715
2716         memset(trd, 0, sizeof(*trd));
2717         init_completion(&trd->trd_starting);
2718         init_completion(&trd->trd_finishing);
2719         trd->trd_recovery_handler = handler;
2720
2721         rc = server_name2index(obd->obd_name, &index, NULL);
2722         if (rc < 0)
2723                 return rc;
2724
2725         if (!IS_ERR(kthread_run(target_recovery_thread,
2726                                 lut, "tgt_recover_%d", index))) {
2727                 wait_for_completion(&trd->trd_starting);
2728                 LASSERT(obd->obd_recovering != 0);
2729         } else {
2730                 rc = -ECHILD;
2731         }
2732
2733         return rc;
2734 }
2735
2736 void target_stop_recovery_thread(struct obd_device *obd)
2737 {
2738         if (obd->obd_recovery_data.trd_processing_task > 0) {
2739                 struct target_recovery_data *trd = &obd->obd_recovery_data;
2740                 /** recovery can be done but postrecovery is not yet */
2741                 spin_lock(&obd->obd_dev_lock);
2742                 if (obd->obd_recovering) {
2743                         CERROR("%s: Aborting recovery\n", obd->obd_name);
2744                         obd->obd_abort_recovery = 1;
2745                         wake_up(&obd->obd_next_transno_waitq);
2746                 }
2747                 spin_unlock(&obd->obd_dev_lock);
2748                 wait_for_completion(&trd->trd_finishing);
2749         }
2750 }
2751 EXPORT_SYMBOL(target_stop_recovery_thread);
2752
2753 void target_recovery_fini(struct obd_device *obd)
2754 {
2755         class_disconnect_exports(obd);
2756         target_stop_recovery_thread(obd);
2757         target_cleanup_recovery(obd);
2758 }
2759 EXPORT_SYMBOL(target_recovery_fini);
2760
2761 static enum hrtimer_restart target_recovery_expired(struct hrtimer *timer)
2762 {
2763         struct obd_device *obd = container_of(timer, struct obd_device,
2764                                               obd_recovery_timer);
2765
2766         CDEBUG(D_HA,
2767                "%s: recovery timed out; %d clients are still in recovery after %llu seconds (%d clients connected)\n",
2768                obd->obd_name, atomic_read(&obd->obd_lock_replay_clients),
2769                ktime_get_real_seconds() - obd->obd_recovery_start,
2770                atomic_read(&obd->obd_connected_clients));
2771
2772         obd->obd_recovery_expired = 1;
2773         wake_up(&obd->obd_next_transno_waitq);
2774         return HRTIMER_NORESTART;
2775 }
2776
2777 void target_recovery_init(struct lu_target *lut, svc_handler_t handler)
2778 {
2779         struct obd_device *obd = lut->lut_obd;
2780
2781         if (lut->lut_bottom->dd_rdonly)
2782                 return;
2783
2784         if (atomic_read(&obd->obd_max_recoverable_clients) == 0) {
2785                 /** Update server last boot epoch */
2786                 tgt_boot_epoch_update(lut);
2787                 return;
2788         }
2789
2790         CDEBUG(D_HA, "RECOVERY: service %s, %d recoverable clients, "
2791                "last_transno %llu\n", obd->obd_name,
2792                atomic_read(&obd->obd_max_recoverable_clients),
2793                obd->obd_last_committed);
2794         LASSERT(obd->obd_stopping == 0);
2795         obd->obd_next_recovery_transno = obd->obd_last_committed + 1;
2796         obd->obd_recovery_start = 0;
2797         obd->obd_recovery_end = 0;
2798
2799         hrtimer_init(&obd->obd_recovery_timer, CLOCK_MONOTONIC,
2800                      HRTIMER_MODE_ABS);
2801         obd->obd_recovery_timer.function = &target_recovery_expired;
2802         target_start_recovery_thread(lut, handler);
2803 }
2804 EXPORT_SYMBOL(target_recovery_init);
2805
2806 static int target_process_req_flags(struct obd_device *obd,
2807                                     struct ptlrpc_request *req)
2808 {
2809         struct obd_export *exp = req->rq_export;
2810
2811         LASSERT(exp != NULL);
2812         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
2813                 /* client declares he's ready to replay locks */
2814                 spin_lock(&exp->exp_lock);
2815                 if (exp->exp_req_replay_needed) {
2816                         exp->exp_req_replay_needed = 0;
2817                         spin_unlock(&exp->exp_lock);
2818
2819                         LASSERT_ATOMIC_POS(&obd->obd_req_replay_clients);
2820                         atomic_dec(&obd->obd_req_replay_clients);
2821                 } else {
2822                         spin_unlock(&exp->exp_lock);
2823                 }
2824         }
2825         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
2826                 /*
2827                  * client declares he's ready to complete recovery
2828                  * so, we put the request on th final queue
2829                  */
2830                 spin_lock(&exp->exp_lock);
2831                 if (exp->exp_lock_replay_needed) {
2832                         exp->exp_lock_replay_needed = 0;
2833                         spin_unlock(&exp->exp_lock);
2834
2835                         LASSERT_ATOMIC_POS(&obd->obd_lock_replay_clients);
2836                         atomic_dec(&obd->obd_lock_replay_clients);
2837                 } else {
2838                         spin_unlock(&exp->exp_lock);
2839                 }
2840         }
2841         return 0;
2842 }
2843
2844 int target_queue_recovery_request(struct ptlrpc_request *req,
2845                                   struct obd_device *obd)
2846 {
2847         __u64 transno = lustre_msg_get_transno(req->rq_reqmsg);
2848         struct ptlrpc_request *reqiter;
2849         int inserted = 0;
2850
2851         ENTRY;
2852
2853         if (obd->obd_recovery_data.trd_processing_task == current_pid()) {
2854                 /* Processing the queue right now, don't re-add. */
2855                 RETURN(1);
2856         }
2857
2858         target_process_req_flags(obd, req);
2859
2860         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
2861                 if (unlikely(OBD_FAIL_CHECK(OBD_FAIL_TGT_RECOVERY_REQ_RACE))) {
2862                         if (cfs_fail_val == 1) {
2863                                 cfs_race_state = 1;
2864                                 cfs_fail_val = 0;
2865                                 wake_up(&cfs_race_waitq);
2866
2867                                 set_current_state(TASK_INTERRUPTIBLE);
2868                                 schedule_timeout(cfs_time_seconds(1));
2869                         }
2870                 }
2871
2872                 /*
2873                  * client declares he's ready to complete recovery
2874                  * so, we put the request on th final queue
2875                  */
2876                 target_request_copy_get(req);
2877                 DEBUG_REQ(D_HA, req, "queue final req");
2878                 wake_up(&obd->obd_next_transno_waitq);
2879                 spin_lock(&obd->obd_recovery_task_lock);
2880                 if (obd->obd_recovering) {
2881                         struct ptlrpc_request *tmp;
2882                         struct ptlrpc_request *duplicate = NULL;
2883
2884                         if (likely(!req->rq_export->exp_replay_done)) {
2885                                 req->rq_export->exp_replay_done = 1;
2886                                 list_add_tail(&req->rq_list,
2887                                               &obd->obd_final_req_queue);
2888                                 spin_unlock(&obd->obd_recovery_task_lock);
2889                                 RETURN(0);
2890                         }
2891
2892                         /*
2893                          * XXX O(n), but only happens if final ping is
2894                          * timed out, probably reorganize the list as
2895                          * a hash list later
2896                          */
2897                         list_for_each_entry_safe(reqiter, tmp,
2898                                                  &obd->obd_final_req_queue,
2899                                                  rq_list) {
2900                                 if (reqiter->rq_export == req->rq_export) {
2901                                         list_del_init(&reqiter->rq_list);
2902                                         duplicate = reqiter;
2903                                         break;
2904                                 }
2905                         }
2906
2907                         list_add_tail(&req->rq_list,
2908                                       &obd->obd_final_req_queue);
2909                         req->rq_export->exp_replay_done = 1;
2910                         spin_unlock(&obd->obd_recovery_task_lock);
2911
2912                         if (duplicate != NULL) {
2913                                 DEBUG_REQ(D_HA, duplicate,
2914                                           "put prev final req");
2915                                 target_request_copy_put(duplicate);
2916                         }
2917                         RETURN(0);
2918                 } else {
2919                         spin_unlock(&obd->obd_recovery_task_lock);
2920                         target_request_copy_put(req);
2921                         RETURN(obd->obd_stopping ? -ENOTCONN : 1);
2922                 }
2923         }
2924         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
2925                 /* client declares he's ready to replay locks */
2926                 target_request_copy_get(req);
2927                 DEBUG_REQ(D_HA, req, "queue lock replay req");
2928                 wake_up(&obd->obd_next_transno_waitq);
2929                 spin_lock(&obd->obd_recovery_task_lock);
2930                 LASSERT(obd->obd_recovering);
2931                 /* usually due to recovery abort */
2932                 if (!req->rq_export->exp_in_recovery) {
2933                         spin_unlock(&obd->obd_recovery_task_lock);
2934                         target_request_copy_put(req);
2935                         RETURN(-ENOTCONN);
2936                 }
2937                 LASSERT(req->rq_export->exp_lock_replay_needed);
2938                 list_add_tail(&req->rq_list, &obd->obd_lock_replay_queue);
2939                 spin_unlock(&obd->obd_recovery_task_lock);
2940                 RETURN(0);
2941         }
2942
2943         /*
2944          * CAVEAT EMPTOR: The incoming request message has been swabbed
2945          * (i.e. buflens etc are in my own byte order), but type-dependent
2946          * buffers (eg mdt_body, ost_body etc) have NOT been swabbed.
2947          */
2948
2949         if (!transno) {
2950                 INIT_LIST_HEAD(&req->rq_list);
2951                 DEBUG_REQ(D_HA, req, "not queueing");
2952                 RETURN(1);
2953         }
2954
2955         /*
2956          * If we're processing the queue, we want don't want to queue this
2957          * message.
2958          *
2959          * Also, if this request has a transno less than the one we're waiting
2960          * for, we should process it now.  It could (and currently always will)
2961          * be an open request for a descriptor that was opened some time ago.
2962          *
2963          * Also, a resent, replayed request that has already been
2964          * handled will pass through here and be processed immediately.
2965          */
2966         CDEBUG(D_HA,
2967                "Next recovery transno: %llu, current: %llu, replaying\n",
2968                obd->obd_next_recovery_transno, transno);
2969
2970         /*
2971          * If the request has been replayed by update replay, then sends this
2972          * request to the recovery thread (replay_request_or_update()), where
2973          * it will be handled
2974          */
2975         spin_lock(&obd->obd_recovery_task_lock);
2976         if (transno < obd->obd_next_recovery_transno &&
2977             !is_req_replayed_by_update(req)) {
2978                 /* Processing the queue right now, don't re-add. */
2979                 LASSERT(list_empty(&req->rq_list));
2980                 spin_unlock(&obd->obd_recovery_task_lock);
2981                 RETURN(1);
2982         }
2983         spin_unlock(&obd->obd_recovery_task_lock);
2984
2985         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_REPLAY_DROP))
2986                 RETURN(0);
2987
2988         target_request_copy_get(req);
2989         if (!req->rq_export->exp_in_recovery) {
2990                 target_request_copy_put(req);
2991                 RETURN(-ENOTCONN);
2992         }
2993         LASSERT(req->rq_export->exp_req_replay_needed);
2994
2995         if (target_exp_enqueue_req_replay(req)) {
2996                 DEBUG_REQ(D_ERROR, req, "dropping resent queued req");
2997                 target_request_copy_put(req);
2998                 RETURN(0);
2999         }
3000
3001         /* XXX O(n^2) */
3002         spin_lock(&obd->obd_recovery_task_lock);
3003         LASSERT(obd->obd_recovering);
3004         list_for_each_entry(reqiter, &obd->obd_req_replay_queue, rq_list) {
3005                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) > transno) {
3006                         list_add_tail(&req->rq_list, &reqiter->rq_list);
3007                         inserted = 1;
3008                         goto added;
3009                 }
3010
3011                 if (unlikely(lustre_msg_get_transno(reqiter->rq_reqmsg) ==
3012                              transno)) {
3013                         DEBUG_REQ(D_ERROR, req,
3014                                   "dropping replay: transno has been claimed by another client");
3015                         spin_unlock(&obd->obd_recovery_task_lock);
3016                         target_exp_dequeue_req_replay(req);
3017                         target_request_copy_put(req);
3018                         RETURN(0);
3019                 }
3020         }
3021 added:
3022         if (!inserted)
3023                 list_add_tail(&req->rq_list, &obd->obd_req_replay_queue);
3024
3025         obd->obd_requests_queued_for_recovery++;
3026         spin_unlock(&obd->obd_recovery_task_lock);
3027         wake_up(&obd->obd_next_transno_waitq);
3028         RETURN(0);
3029 }
3030
3031 void target_committed_to_req(struct ptlrpc_request *req)
3032 {
3033         struct obd_export *exp = req->rq_export;
3034
3035         if (!exp->exp_obd->obd_no_transno && req->rq_repmsg != NULL)
3036                 lustre_msg_set_last_committed(req->rq_repmsg,
3037                                               exp->exp_last_committed);
3038         else
3039                 DEBUG_REQ(D_IOCTL, req,
3040                           "not sending last_committed update (%d/%d)",
3041                           exp->exp_obd->obd_no_transno,
3042                           req->rq_repmsg == NULL);
3043
3044         CDEBUG(D_INFO, "last_committed %llu, transno %llu, xid %llu\n",
3045                exp->exp_last_committed, req->rq_transno, req->rq_xid);
3046 }
3047
3048 #endif /* HAVE_SERVER_SUPPORT */
3049
3050 /**
3051  * Packs current SLV and Limit into \a req.
3052  */
3053 int target_pack_pool_reply(struct ptlrpc_request *req)
3054 {
3055         struct obd_device *obd;
3056
3057         ENTRY;
3058
3059         /*
3060          * Check that we still have all structures alive as this may
3061          * be some late RPC at shutdown time.
3062          */
3063         if (unlikely(!req->rq_export || !req->rq_export->exp_obd ||
3064                      !exp_connect_lru_resize(req->rq_export))) {
3065                 lustre_msg_set_slv(req->rq_repmsg, 0);
3066                 lustre_msg_set_limit(req->rq_repmsg, 0);
3067                 RETURN(0);
3068         }
3069
3070         /* OBD is alive here as export is alive, which we checked above. */
3071         obd = req->rq_export->exp_obd;
3072
3073         read_lock(&obd->obd_pool_lock);
3074         lustre_msg_set_slv(req->rq_repmsg, obd->obd_pool_slv);
3075         lustre_msg_set_limit(req->rq_repmsg, obd->obd_pool_limit);
3076         read_unlock(&obd->obd_pool_lock);
3077
3078         RETURN(0);
3079 }
3080
3081 static int target_send_reply_msg(struct ptlrpc_request *req,
3082                                  int rc, int fail_id)
3083 {
3084         if (OBD_FAIL_CHECK_ORSET(fail_id & ~OBD_FAIL_ONCE, OBD_FAIL_ONCE)) {
3085                 DEBUG_REQ(D_ERROR, req, "dropping reply");
3086                 return -ECOMM;
3087         }
3088         /*
3089          * We can have a null rq_reqmsg in the event of bad signature or
3090          * no context when unwrapping
3091          */
3092         if (req->rq_reqmsg &&
3093             unlikely(lustre_msg_get_opc(req->rq_reqmsg) == MDS_REINT &&
3094             OBD_FAIL_CHECK(OBD_FAIL_MDS_REINT_MULTI_NET_REP)))
3095                 return -ECOMM;
3096
3097         if (unlikely(rc)) {
3098                 DEBUG_REQ(D_NET, req, "processing error (%d)", rc);
3099                 req->rq_status = rc;
3100                 return ptlrpc_send_error(req, 1);
3101         }
3102         DEBUG_REQ(D_NET, req, "sending reply");
3103
3104         return ptlrpc_send_reply(req, PTLRPC_REPLY_MAYBE_DIFFICULT);
3105 }
3106
3107 void target_send_reply(struct ptlrpc_request *req, int rc, int fail_id)
3108 {
3109         struct ptlrpc_service_part *svcpt;
3110         int netrc;
3111         struct ptlrpc_reply_state *rs;
3112         struct obd_export *exp;
3113
3114         ENTRY;
3115
3116         if (req->rq_no_reply) {
3117                 EXIT;
3118                 return;
3119         }
3120
3121         svcpt = req->rq_rqbd->rqbd_svcpt;
3122         rs = req->rq_reply_state;
3123         if (rs == NULL || !rs->rs_difficult) {
3124                 /* no notifiers */
3125                 target_send_reply_msg(req, rc, fail_id);
3126                 EXIT;
3127                 return;
3128         }
3129
3130         /* must be an export if locks saved */
3131         LASSERT(req->rq_export != NULL);
3132         /* req/reply consistent */
3133         LASSERT(rs->rs_svcpt == svcpt);
3134
3135         /* "fresh" reply */
3136         LASSERT(!rs->rs_scheduled);
3137         LASSERT(!rs->rs_scheduled_ever);
3138         LASSERT(!rs->rs_handled);
3139         LASSERT(!rs->rs_on_net);
3140         LASSERT(rs->rs_export == NULL);
3141         LASSERT(list_empty(&rs->rs_obd_list));
3142         LASSERT(list_empty(&rs->rs_exp_list));
3143
3144         exp = class_export_get(req->rq_export);
3145
3146         /* disable reply scheduling while I'm setting up */
3147         rs->rs_scheduled = 1;
3148         rs->rs_on_net    = 1;
3149         rs->rs_xid       = req->rq_xid;
3150         rs->rs_transno   = req->rq_transno;
3151         rs->rs_export    = exp;
3152         rs->rs_opc       = lustre_msg_get_opc(req->rq_reqmsg);
3153
3154         spin_lock(&exp->exp_uncommitted_replies_lock);
3155         CDEBUG(D_NET, "rs transno = %llu, last committed = %llu\n",
3156                rs->rs_transno, exp->exp_last_committed);
3157         if (rs->rs_transno > exp->exp_last_committed) {
3158                 /* not committed already */
3159                 list_add_tail(&rs->rs_obd_list,
3160                                   &exp->exp_uncommitted_replies);
3161         }
3162         spin_unlock(&exp->exp_uncommitted_replies_lock);
3163
3164         spin_lock(&exp->exp_lock);
3165         list_add_tail(&rs->rs_exp_list, &exp->exp_outstanding_replies);
3166         spin_unlock(&exp->exp_lock);
3167
3168         netrc = target_send_reply_msg(req, rc, fail_id);
3169
3170         spin_lock(&svcpt->scp_rep_lock);
3171
3172         atomic_inc(&svcpt->scp_nreps_difficult);
3173
3174         if (netrc != 0) {
3175                 /*
3176  &nb