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LU-11599 ldlm: printing negative time on logs for recovery
[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 <linux/jiffies.h>
43 #include <linux/kthread.h>
44 #include <libcfs/libcfs.h>
45 #include <obd.h>
46 #include <obd_class.h>
47 #include <lustre_dlm.h>
48 #include <lustre_net.h>
49 #include <lustre_sec.h>
50 #include "ldlm_internal.h"
51
52 /* @priority: If non-zero, move the selected connection to the list head.
53  * @create: If zero, only search in existing connections.
54  */
55 static int import_set_conn(struct obd_import *imp, struct obd_uuid *uuid,
56                            int priority, int create)
57 {
58         struct ptlrpc_connection *ptlrpc_conn;
59         struct obd_import_conn *imp_conn = NULL, *item;
60         lnet_nid_t nid4refnet = LNET_NID_ANY;
61         int rc = 0;
62         ENTRY;
63
64         if (!create && !priority) {
65                 CDEBUG(D_HA, "Nothing to do\n");
66                 RETURN(-EINVAL);
67         }
68
69         if (imp->imp_connection &&
70             imp->imp_connection->c_remote_uuid.uuid[0] == 0)
71                 /* nid4refnet is used to restrict network connections */
72                 nid4refnet = imp->imp_connection->c_self;
73         ptlrpc_conn = ptlrpc_uuid_to_connection(uuid, nid4refnet);
74         if (!ptlrpc_conn) {
75                 CDEBUG(D_HA, "can't find connection %s\n", uuid->uuid);
76                 RETURN(-ENOENT);
77         }
78
79         if (create) {
80                 OBD_ALLOC(imp_conn, sizeof(*imp_conn));
81                 if (!imp_conn)
82                         GOTO(out_put, rc = -ENOMEM);
83         }
84
85         spin_lock(&imp->imp_lock);
86         list_for_each_entry(item, &imp->imp_conn_list, oic_item) {
87                 if (obd_uuid_equals(uuid, &item->oic_uuid)) {
88                         if (priority) {
89                                 list_del(&item->oic_item);
90                                 list_add(&item->oic_item,
91                                          &imp->imp_conn_list);
92                                 item->oic_last_attempt = 0;
93                         }
94                         CDEBUG(D_HA, "imp %p@%s: found existing conn %s%s\n",
95                                imp, imp->imp_obd->obd_name, uuid->uuid,
96                                (priority ? ", moved to head" : ""));
97                         spin_unlock(&imp->imp_lock);
98                         GOTO(out_free, rc = 0);
99                 }
100         }
101         /* No existing import connection found for \a uuid. */
102         if (create) {
103                 imp_conn->oic_conn = ptlrpc_conn;
104                 imp_conn->oic_uuid = *uuid;
105                 imp_conn->oic_last_attempt = 0;
106                 if (priority)
107                         list_add(&imp_conn->oic_item, &imp->imp_conn_list);
108                 else
109                         list_add_tail(&imp_conn->oic_item,
110                                       &imp->imp_conn_list);
111                 CDEBUG(D_HA, "imp %p@%s: add connection %s at %s\n",
112                        imp, imp->imp_obd->obd_name, uuid->uuid,
113                        (priority ? "head" : "tail"));
114         } else {
115                 spin_unlock(&imp->imp_lock);
116                 GOTO(out_free, rc = -ENOENT);
117         }
118
119         spin_unlock(&imp->imp_lock);
120         RETURN(0);
121 out_free:
122         if (imp_conn)
123                 OBD_FREE(imp_conn, sizeof(*imp_conn));
124 out_put:
125         ptlrpc_connection_put(ptlrpc_conn);
126         RETURN(rc);
127 }
128
129 int import_set_conn_priority(struct obd_import *imp, struct obd_uuid *uuid)
130 {
131         return import_set_conn(imp, uuid, 1, 0);
132 }
133
134 int client_import_add_conn(struct obd_import *imp, struct obd_uuid *uuid,
135                            int priority)
136 {
137         return import_set_conn(imp, uuid, priority, 1);
138 }
139 EXPORT_SYMBOL(client_import_add_conn);
140
141 int client_import_del_conn(struct obd_import *imp, struct obd_uuid *uuid)
142 {
143         struct obd_import_conn *imp_conn;
144         struct obd_export *dlmexp;
145         int rc = -ENOENT;
146         ENTRY;
147
148         spin_lock(&imp->imp_lock);
149         if (list_empty(&imp->imp_conn_list)) {
150                 LASSERT(!imp->imp_connection);
151                 GOTO(out, rc);
152         }
153
154         list_for_each_entry(imp_conn, &imp->imp_conn_list, oic_item) {
155                 if (!obd_uuid_equals(uuid, &imp_conn->oic_uuid))
156                         continue;
157                 LASSERT(imp_conn->oic_conn);
158
159                 if (imp_conn == imp->imp_conn_current) {
160                         LASSERT(imp_conn->oic_conn == imp->imp_connection);
161
162                         if (imp->imp_state != LUSTRE_IMP_CLOSED &&
163                             imp->imp_state != LUSTRE_IMP_DISCON) {
164                                 CERROR("can't remove current connection\n");
165                                 GOTO(out, rc = -EBUSY);
166                         }
167
168                         ptlrpc_connection_put(imp->imp_connection);
169                         imp->imp_connection = NULL;
170
171                         dlmexp = class_conn2export(&imp->imp_dlm_handle);
172                         if (dlmexp && dlmexp->exp_connection) {
173                                 LASSERT(dlmexp->exp_connection ==
174                                         imp_conn->oic_conn);
175                                 ptlrpc_connection_put(dlmexp->exp_connection);
176                                 dlmexp->exp_connection = NULL;
177                         }
178
179                         if (dlmexp != NULL)
180                                 class_export_put(dlmexp);
181                 }
182
183                 list_del(&imp_conn->oic_item);
184                 ptlrpc_connection_put(imp_conn->oic_conn);
185                 OBD_FREE(imp_conn, sizeof(*imp_conn));
186                 CDEBUG(D_HA, "imp %p@%s: remove connection %s\n",
187                        imp, imp->imp_obd->obd_name, uuid->uuid);
188                 rc = 0;
189                 break;
190         }
191 out:
192         spin_unlock(&imp->imp_lock);
193         if (rc == -ENOENT)
194                 CERROR("connection %s not found\n", uuid->uuid);
195         RETURN(rc);
196 }
197 EXPORT_SYMBOL(client_import_del_conn);
198
199 /**
200  * Find conn UUID by peer NID. \a peer is a server NID. This function is used
201  * to find a conn uuid of \a imp which can reach \a peer.
202  */
203 int client_import_find_conn(struct obd_import *imp, lnet_nid_t peer,
204                             struct obd_uuid *uuid)
205 {
206         struct obd_import_conn *conn;
207         int rc = -ENOENT;
208         ENTRY;
209
210         spin_lock(&imp->imp_lock);
211         list_for_each_entry(conn, &imp->imp_conn_list, oic_item) {
212                 /* Check if conn UUID does have this peer NID. */
213                 if (class_check_uuid(&conn->oic_uuid, peer)) {
214                         *uuid = conn->oic_uuid;
215                         rc = 0;
216                         break;
217                 }
218         }
219         spin_unlock(&imp->imp_lock);
220         RETURN(rc);
221 }
222 EXPORT_SYMBOL(client_import_find_conn);
223
224 void client_destroy_import(struct obd_import *imp)
225 {
226         /* Drop security policy instance after all RPCs have finished/aborted
227          * to let all busy contexts be released. */
228         class_import_get(imp);
229         class_destroy_import(imp);
230         sptlrpc_import_sec_put(imp);
231         class_import_put(imp);
232 }
233 EXPORT_SYMBOL(client_destroy_import);
234
235 /**
236  * Check whether or not the OSC is on MDT.
237  * In the config log,
238  * osc on MDT
239  *      setup 0:{fsname}-OSTxxxx-osc[-MDTxxxx] 1:lustre-OST0000_UUID 2:NID
240  * osc on client
241  *      setup 0:{fsname}-OSTxxxx-osc 1:lustre-OST0000_UUID 2:NID
242  *
243  **/
244 static int osc_on_mdt(char *obdname)
245 {
246         char *ptr;
247
248         ptr = strrchr(obdname, '-');
249         if (ptr == NULL)
250                 return 0;
251
252         if (strncmp(ptr + 1, "MDT", 3) == 0)
253                 return 1;
254
255         return 0;
256 }
257
258 /* Configure an RPC client OBD device.
259  *
260  * lcfg parameters:
261  * 1 - client UUID
262  * 2 - server UUID
263  * 3 - inactive-on-startup
264  * 4 - restrictive net
265  */
266 int client_obd_setup(struct obd_device *obddev, struct lustre_cfg *lcfg)
267 {
268         struct client_obd *cli = &obddev->u.cli;
269         struct obd_import *imp;
270         struct obd_uuid server_uuid;
271         int rq_portal, rp_portal, connect_op;
272         char *name = obddev->obd_type->typ_name;
273         enum ldlm_ns_type ns_type = LDLM_NS_TYPE_UNKNOWN;
274         char *cli_name = lustre_cfg_buf(lcfg, 0);
275         struct ptlrpc_connection fake_conn = { .c_self = 0,
276                                                .c_remote_uuid.uuid[0] = 0 };
277         int rc;
278         ENTRY;
279
280         /* In a more perfect world, we would hang a ptlrpc_client off of
281          * obd_type and just use the values from there. */
282         if (!strcmp(name, LUSTRE_OSC_NAME)) {
283                 rq_portal = OST_REQUEST_PORTAL;
284                 rp_portal = OSC_REPLY_PORTAL;
285                 connect_op = OST_CONNECT;
286                 cli->cl_sp_me = LUSTRE_SP_CLI;
287                 cli->cl_sp_to = LUSTRE_SP_OST;
288                 ns_type = LDLM_NS_TYPE_OSC;
289         } else if (!strcmp(name, LUSTRE_MDC_NAME) ||
290                    !strcmp(name, LUSTRE_LWP_NAME)) {
291                 rq_portal = MDS_REQUEST_PORTAL;
292                 rp_portal = MDC_REPLY_PORTAL;
293                 connect_op = MDS_CONNECT;
294                 if (is_lwp_on_ost(cli_name))
295                         cli->cl_sp_me = LUSTRE_SP_OST;
296                 else if (is_lwp_on_mdt(cli_name))
297                         cli->cl_sp_me = LUSTRE_SP_MDT;
298                 else
299                         cli->cl_sp_me = LUSTRE_SP_CLI;
300                 cli->cl_sp_to = LUSTRE_SP_MDT;
301                 ns_type = LDLM_NS_TYPE_MDC;
302         } else if (!strcmp(name, LUSTRE_OSP_NAME)) {
303                 if (strstr(lustre_cfg_buf(lcfg, 1), "OST") == NULL) {
304                         /* OSP_on_MDT for other MDTs */
305                         connect_op = MDS_CONNECT;
306                         cli->cl_sp_to = LUSTRE_SP_MDT;
307                         ns_type = LDLM_NS_TYPE_MDC;
308                         rq_portal = OUT_PORTAL;
309                 } else {
310                         /* OSP on MDT for OST */
311                         connect_op = OST_CONNECT;
312                         cli->cl_sp_to = LUSTRE_SP_OST;
313                         ns_type = LDLM_NS_TYPE_OSC;
314                         rq_portal = OST_REQUEST_PORTAL;
315                 }
316                 rp_portal = OSC_REPLY_PORTAL;
317                 cli->cl_sp_me = LUSTRE_SP_MDT;
318         } else if (!strcmp(name, LUSTRE_MGC_NAME)) {
319                 rq_portal = MGS_REQUEST_PORTAL;
320                 rp_portal = MGC_REPLY_PORTAL;
321                 connect_op = MGS_CONNECT;
322                 cli->cl_sp_me = LUSTRE_SP_MGC;
323                 cli->cl_sp_to = LUSTRE_SP_MGS;
324                 cli->cl_flvr_mgc.sf_rpc = SPTLRPC_FLVR_INVALID;
325                 ns_type = LDLM_NS_TYPE_MGC;
326         } else {
327                 CERROR("unknown client OBD type \"%s\", can't setup\n",
328                        name);
329                 RETURN(-EINVAL);
330         }
331
332         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
333                 CERROR("requires a TARGET UUID\n");
334                 RETURN(-EINVAL);
335         }
336
337         if (LUSTRE_CFG_BUFLEN(lcfg, 1) > 37) {
338                 CERROR("client UUID must be less than 38 characters\n");
339                 RETURN(-EINVAL);
340         }
341
342         if (LUSTRE_CFG_BUFLEN(lcfg, 2) < 1) {
343                 CERROR("setup requires a SERVER UUID\n");
344                 RETURN(-EINVAL);
345         }
346
347         if (LUSTRE_CFG_BUFLEN(lcfg, 2) > 37) {
348                 CERROR("target UUID must be less than 38 characters\n");
349                 RETURN(-EINVAL);
350         }
351
352         init_rwsem(&cli->cl_sem);
353         mutex_init(&cli->cl_mgc_mutex);
354         cli->cl_seq = NULL;
355         init_rwsem(&cli->cl_seq_rwsem);
356         cli->cl_conn_count = 0;
357         memcpy(server_uuid.uuid, lustre_cfg_buf(lcfg, 2),
358                min_t(unsigned int, LUSTRE_CFG_BUFLEN(lcfg, 2),
359                      sizeof(server_uuid)));
360
361         cli->cl_dirty_pages = 0;
362         cli->cl_avail_grant = 0;
363         /* FIXME: Should limit this for the sum of all cl_dirty_max_pages. */
364         /* cl_dirty_max_pages may be changed at connect time in
365          * ptlrpc_connect_interpret(). */
366         client_adjust_max_dirty(cli);
367         INIT_LIST_HEAD(&cli->cl_cache_waiters);
368         INIT_LIST_HEAD(&cli->cl_loi_ready_list);
369         INIT_LIST_HEAD(&cli->cl_loi_hp_ready_list);
370         INIT_LIST_HEAD(&cli->cl_loi_write_list);
371         INIT_LIST_HEAD(&cli->cl_loi_read_list);
372         spin_lock_init(&cli->cl_loi_list_lock);
373         atomic_set(&cli->cl_pending_w_pages, 0);
374         atomic_set(&cli->cl_pending_r_pages, 0);
375         cli->cl_r_in_flight = 0;
376         cli->cl_w_in_flight = 0;
377
378         spin_lock_init(&cli->cl_read_rpc_hist.oh_lock);
379         spin_lock_init(&cli->cl_write_rpc_hist.oh_lock);
380         spin_lock_init(&cli->cl_read_page_hist.oh_lock);
381         spin_lock_init(&cli->cl_write_page_hist.oh_lock);
382         spin_lock_init(&cli->cl_read_offset_hist.oh_lock);
383         spin_lock_init(&cli->cl_write_offset_hist.oh_lock);
384
385         /* lru for osc. */
386         INIT_LIST_HEAD(&cli->cl_lru_osc);
387         atomic_set(&cli->cl_lru_shrinkers, 0);
388         atomic_long_set(&cli->cl_lru_busy, 0);
389         atomic_long_set(&cli->cl_lru_in_list, 0);
390         INIT_LIST_HEAD(&cli->cl_lru_list);
391         spin_lock_init(&cli->cl_lru_list_lock);
392         atomic_long_set(&cli->cl_unstable_count, 0);
393         INIT_LIST_HEAD(&cli->cl_shrink_list);
394         INIT_LIST_HEAD(&cli->cl_grant_chain);
395
396         INIT_LIST_HEAD(&cli->cl_flight_waiters);
397         cli->cl_rpcs_in_flight = 0;
398
399         init_waitqueue_head(&cli->cl_destroy_waitq);
400         atomic_set(&cli->cl_destroy_in_flight, 0);
401
402         cli->cl_supp_cksum_types = OBD_CKSUM_CRC32;
403 #ifdef ENABLE_CHECKSUM
404         /* Turn on checksumming by default. */
405         cli->cl_checksum = 1;
406         /*
407          * The supported checksum types will be worked out at connect time
408          * Set cl_chksum* to CRC32 for now to avoid returning screwed info
409          * through procfs.
410          */
411         cli->cl_cksum_type = cli->cl_supp_cksum_types;
412 #endif
413         atomic_set(&cli->cl_resends, OSC_DEFAULT_RESENDS);
414
415         /* Set it to possible maximum size. It may be reduced by ocd_brw_size
416          * from OFD after connecting. */
417         cli->cl_max_pages_per_rpc = PTLRPC_MAX_BRW_PAGES;
418
419         cli->cl_max_short_io_bytes = OBD_MAX_SHORT_IO_BYTES;
420
421         /* set cl_chunkbits default value to PAGE_SHIFT,
422          * it will be updated at OSC connection time. */
423         cli->cl_chunkbits = PAGE_SHIFT;
424
425         if (!strcmp(name, LUSTRE_MDC_NAME)) {
426                 cli->cl_max_rpcs_in_flight = OBD_MAX_RIF_DEFAULT;
427         } else if (totalram_pages >> (20 - PAGE_SHIFT) <= 128 /* MB */) {
428                 cli->cl_max_rpcs_in_flight = 2;
429         } else if (totalram_pages >> (20 - PAGE_SHIFT) <= 256 /* MB */) {
430                 cli->cl_max_rpcs_in_flight = 3;
431         } else if (totalram_pages >> (20 - PAGE_SHIFT) <= 512 /* MB */) {
432                 cli->cl_max_rpcs_in_flight = 4;
433         } else {
434                 if (osc_on_mdt(obddev->obd_name))
435                         cli->cl_max_rpcs_in_flight = OBD_MAX_RIF_MAX;
436                 else
437                         cli->cl_max_rpcs_in_flight = OBD_MAX_RIF_DEFAULT;
438         }
439
440         spin_lock_init(&cli->cl_mod_rpcs_lock);
441         spin_lock_init(&cli->cl_mod_rpcs_hist.oh_lock);
442         cli->cl_max_mod_rpcs_in_flight = 0;
443         cli->cl_mod_rpcs_in_flight = 0;
444         cli->cl_close_rpcs_in_flight = 0;
445         init_waitqueue_head(&cli->cl_mod_rpcs_waitq);
446         cli->cl_mod_tag_bitmap = NULL;
447
448         INIT_LIST_HEAD(&cli->cl_chg_dev_linkage);
449
450         if (connect_op == MDS_CONNECT) {
451                 cli->cl_max_mod_rpcs_in_flight = cli->cl_max_rpcs_in_flight - 1;
452                 OBD_ALLOC(cli->cl_mod_tag_bitmap,
453                           BITS_TO_LONGS(OBD_MAX_RIF_MAX) * sizeof(long));
454                 if (cli->cl_mod_tag_bitmap == NULL)
455                         GOTO(err, rc = -ENOMEM);
456         }
457
458         rc = ldlm_get_ref();
459         if (rc) {
460                 CERROR("ldlm_get_ref failed: %d\n", rc);
461                 GOTO(err, rc);
462         }
463
464         ptlrpc_init_client(rq_portal, rp_portal, name,
465                            &obddev->obd_ldlm_client);
466
467         imp = class_new_import(obddev);
468         if (imp == NULL)
469                 GOTO(err_ldlm, rc = -ENOENT);
470         imp->imp_client = &obddev->obd_ldlm_client;
471         imp->imp_connect_op = connect_op;
472         memcpy(cli->cl_target_uuid.uuid, lustre_cfg_buf(lcfg, 1),
473                LUSTRE_CFG_BUFLEN(lcfg, 1));
474         class_import_put(imp);
475
476         if (lustre_cfg_buf(lcfg, 4)) {
477                 __u32 refnet = libcfs_str2net(lustre_cfg_string(lcfg, 4));
478
479                 if (refnet == LNET_NIDNET(LNET_NID_ANY)) {
480                         rc = -EINVAL;
481                         CERROR("%s: bad mount option 'network=%s': rc = %d\n",
482                                obddev->obd_name, lustre_cfg_string(lcfg, 4),
483                                rc);
484                         GOTO(err_import, rc);
485                 }
486                 fake_conn.c_self = LNET_MKNID(refnet, 0);
487                 imp->imp_connection = &fake_conn;
488         }
489
490         rc = client_import_add_conn(imp, &server_uuid, 1);
491         if (rc) {
492                 CERROR("can't add initial connection\n");
493                 GOTO(err_import, rc);
494         }
495         imp->imp_connection = NULL;
496
497         cli->cl_import = imp;
498         /* cli->cl_max_mds_easize updated by mdc_init_ea_size() */
499         cli->cl_max_mds_easize = sizeof(struct lov_mds_md_v3);
500
501         if (LUSTRE_CFG_BUFLEN(lcfg, 3) > 0) {
502                 if (!strcmp(lustre_cfg_string(lcfg, 3), "inactive")) {
503                         CDEBUG(D_HA, "marking %s %s->%s as inactive\n",
504                                name, obddev->obd_name,
505                                cli->cl_target_uuid.uuid);
506                         spin_lock(&imp->imp_lock);
507                         imp->imp_deactive = 1;
508                         spin_unlock(&imp->imp_lock);
509                 }
510         }
511
512         obddev->obd_namespace = ldlm_namespace_new(obddev, obddev->obd_name,
513                                                    LDLM_NAMESPACE_CLIENT,
514                                                    LDLM_NAMESPACE_GREEDY,
515                                                    ns_type);
516         if (obddev->obd_namespace == NULL) {
517                 CERROR("Unable to create client namespace - %s\n",
518                        obddev->obd_name);
519                 GOTO(err_import, rc = -ENOMEM);
520         }
521
522         RETURN(rc);
523
524 err_import:
525         class_destroy_import(imp);
526 err_ldlm:
527         ldlm_put_ref();
528 err:
529         if (cli->cl_mod_tag_bitmap != NULL)
530                 OBD_FREE(cli->cl_mod_tag_bitmap,
531                          BITS_TO_LONGS(OBD_MAX_RIF_MAX) * sizeof(long));
532         cli->cl_mod_tag_bitmap = NULL;
533         RETURN(rc);
534
535 }
536 EXPORT_SYMBOL(client_obd_setup);
537
538 int client_obd_cleanup(struct obd_device *obddev)
539 {
540         struct client_obd *cli = &obddev->u.cli;
541         ENTRY;
542
543         ldlm_namespace_free_post(obddev->obd_namespace);
544         obddev->obd_namespace = NULL;
545
546         obd_cleanup_client_import(obddev);
547         LASSERT(obddev->u.cli.cl_import == NULL);
548
549         ldlm_put_ref();
550
551         if (cli->cl_mod_tag_bitmap != NULL)
552                 OBD_FREE(cli->cl_mod_tag_bitmap,
553                          BITS_TO_LONGS(OBD_MAX_RIF_MAX) * sizeof(long));
554         cli->cl_mod_tag_bitmap = NULL;
555
556         RETURN(0);
557 }
558 EXPORT_SYMBOL(client_obd_cleanup);
559
560 /* ->o_connect() method for client side (OSC and MDC and MGC) */
561 int client_connect_import(const struct lu_env *env,
562                           struct obd_export **exp,
563                           struct obd_device *obd, struct obd_uuid *cluuid,
564                           struct obd_connect_data *data, void *localdata)
565 {
566         struct client_obd       *cli    = &obd->u.cli;
567         struct obd_import       *imp    = cli->cl_import;
568         struct obd_connect_data *ocd;
569         struct lustre_handle    conn    = { 0 };
570         int                     rc;
571         ENTRY;
572
573         *exp = NULL;
574         down_write(&cli->cl_sem);
575         if (cli->cl_conn_count > 0)
576                 GOTO(out_sem, rc = -EALREADY);
577
578         rc = class_connect(&conn, obd, cluuid);
579         if (rc)
580                 GOTO(out_sem, rc);
581
582         cli->cl_conn_count++;
583         *exp = class_conn2export(&conn);
584
585         LASSERT(obd->obd_namespace);
586
587         imp->imp_dlm_handle = conn;
588         rc = ptlrpc_init_import(imp);
589         if (rc != 0)
590                 GOTO(out_ldlm, rc);
591
592         ocd = &imp->imp_connect_data;
593         if (data) {
594                 *ocd = *data;
595                 imp->imp_connect_flags_orig = data->ocd_connect_flags;
596                 imp->imp_connect_flags2_orig = data->ocd_connect_flags2;
597         }
598
599         rc = ptlrpc_connect_import(imp);
600         if (rc != 0) {
601                 LASSERT(imp->imp_state == LUSTRE_IMP_DISCON);
602                 GOTO(out_ldlm, rc);
603         }
604         LASSERT(*exp != NULL && (*exp)->exp_connection);
605
606         if (data) {
607                 LASSERTF((ocd->ocd_connect_flags & data->ocd_connect_flags) ==
608                          ocd->ocd_connect_flags, "old %#llx, new %#llx\n",
609                          data->ocd_connect_flags, ocd->ocd_connect_flags);
610                 data->ocd_connect_flags = ocd->ocd_connect_flags;
611                 data->ocd_connect_flags2 = ocd->ocd_connect_flags2;
612         }
613
614         ptlrpc_pinger_add_import(imp);
615
616         EXIT;
617
618         if (rc) {
619 out_ldlm:
620                 cli->cl_conn_count--;
621                 class_disconnect(*exp);
622                 *exp = NULL;
623         }
624 out_sem:
625         up_write(&cli->cl_sem);
626
627         return rc;
628 }
629 EXPORT_SYMBOL(client_connect_import);
630
631 int client_disconnect_export(struct obd_export *exp)
632 {
633         struct obd_device *obd = class_exp2obd(exp);
634         struct client_obd *cli;
635         struct obd_import *imp;
636         int rc = 0, err;
637         ENTRY;
638
639         if (!obd) {
640                 CERROR("invalid export for disconnect: exp %p cookie %#llx\n",
641                        exp, exp ? exp->exp_handle.h_cookie : -1);
642                 RETURN(-EINVAL);
643         }
644
645         cli = &obd->u.cli;
646         imp = cli->cl_import;
647
648         down_write(&cli->cl_sem);
649         CDEBUG(D_INFO, "disconnect %s - %zu\n", obd->obd_name,
650                 cli->cl_conn_count);
651
652         if (cli->cl_conn_count == 0) {
653                 CERROR("disconnecting disconnected device (%s)\n",
654                        obd->obd_name);
655                 GOTO(out_disconnect, rc = -EINVAL);
656         }
657
658         cli->cl_conn_count--;
659         if (cli->cl_conn_count != 0)
660                 GOTO(out_disconnect, rc = 0);
661
662         /* Mark import deactivated now, so we don't try to reconnect if any
663          * of the cleanup RPCs fails (e.g. LDLM cancel, etc).  We don't
664          * fully deactivate the import, or that would drop all requests. */
665         spin_lock(&imp->imp_lock);
666         imp->imp_deactive = 1;
667         spin_unlock(&imp->imp_lock);
668
669         /* Some non-replayable imports (MDS's OSCs) are pinged, so just
670          * delete it regardless.  (It's safe to delete an import that was
671          * never added.) */
672         (void)ptlrpc_pinger_del_import(imp);
673
674         if (obd->obd_namespace != NULL) {
675                 /* obd_force == local only */
676                 ldlm_cli_cancel_unused(obd->obd_namespace, NULL,
677                                        obd->obd_force ? LCF_LOCAL : 0, NULL);
678                 ldlm_namespace_free_prior(obd->obd_namespace, imp, obd->obd_force);
679         }
680
681         /* There's no need to hold sem while disconnecting an import,
682          * and it may actually cause deadlock in GSS. */
683         up_write(&cli->cl_sem);
684         rc = ptlrpc_disconnect_import(imp, 0);
685         down_write(&cli->cl_sem);
686
687         ptlrpc_invalidate_import(imp);
688
689         EXIT;
690
691 out_disconnect:
692         /* Use server style - class_disconnect should be always called for
693          * o_disconnect. */
694         err = class_disconnect(exp);
695         if (!rc && err)
696                 rc = err;
697
698         up_write(&cli->cl_sem);
699
700         RETURN(rc);
701 }
702 EXPORT_SYMBOL(client_disconnect_export);
703
704 #ifdef HAVE_SERVER_SUPPORT
705 int server_disconnect_export(struct obd_export *exp)
706 {
707         int rc;
708         ENTRY;
709
710         /* Disconnect early so that clients can't keep using export. */
711         rc = class_disconnect(exp);
712         /* Close import to avoid sending any requests. */
713         if (exp->exp_imp_reverse)
714                 ptlrpc_cleanup_imp(exp->exp_imp_reverse);
715
716         ldlm_bl_thread_wakeup();
717
718         /* complete all outstanding replies */
719         spin_lock(&exp->exp_lock);
720         while (!list_empty(&exp->exp_outstanding_replies)) {
721                 struct ptlrpc_reply_state *rs =
722                         list_entry(exp->exp_outstanding_replies.next,
723                                        struct ptlrpc_reply_state, rs_exp_list);
724                 struct ptlrpc_service_part *svcpt = rs->rs_svcpt;
725
726                 spin_lock(&svcpt->scp_rep_lock);
727
728                 list_del_init(&rs->rs_exp_list);
729
730                 spin_lock(&rs->rs_lock);
731                 /* clear rs_convert_lock to make sure rs is handled and put */
732                 rs->rs_convert_lock = 0;
733                 ptlrpc_schedule_difficult_reply(rs);
734                 spin_unlock(&rs->rs_lock);
735
736                 spin_unlock(&svcpt->scp_rep_lock);
737         }
738         spin_unlock(&exp->exp_lock);
739
740         RETURN(rc);
741 }
742 EXPORT_SYMBOL(server_disconnect_export);
743
744 /* --------------------------------------------------------------------------
745  * from old lib/target.c
746  * -------------------------------------------------------------------------- */
747
748 static int target_handle_reconnect(struct lustre_handle *conn,
749                                    struct obd_export *exp,
750                                    struct obd_uuid *cluuid)
751 {
752         struct obd_device *target;
753         struct lustre_handle *hdl;
754         time64_t deadline;
755         time64_t timeout;
756         time64_t now;
757         int rc = 0;
758
759         ENTRY;
760         hdl = &exp->exp_imp_reverse->imp_remote_handle;
761         if (!exp->exp_connection || !lustre_handle_is_used(hdl)) {
762                 conn->cookie = exp->exp_handle.h_cookie;
763                 CDEBUG(D_HA, "connect export for UUID '%s' at %p,"
764                        " cookie %#llx\n", cluuid->uuid, exp, conn->cookie);
765                 RETURN(0);
766         }
767
768         target = exp->exp_obd;
769
770         /* Might be a re-connect after a partition. */
771         if (memcmp(&conn->cookie, &hdl->cookie, sizeof conn->cookie)) {
772                 LCONSOLE_WARN("%s: already connected client %s (at %s) "
773                               "with handle %#llx. Rejecting client "
774                               "with the same UUID trying to reconnect "
775                               "with handle %#llx\n", target->obd_name,
776                               obd_uuid2str(&exp->exp_client_uuid),
777                               obd_export_nid2str(exp),
778                               hdl->cookie, conn->cookie);
779                 memset(conn, 0, sizeof *conn);
780                 /* target_handle_connect() treats EALREADY and
781                  * -EALREADY differently.  -EALREADY is an error
782                  * (same UUID, different handle). */
783                 RETURN(-EALREADY);
784         }
785
786         if (!target->obd_recovering) {
787                 LCONSOLE_WARN("%s: Client %s (at %s) reconnecting\n",
788                         target->obd_name, obd_uuid2str(&exp->exp_client_uuid),
789                         obd_export_nid2str(exp));
790                 GOTO(out_already, rc);
791         }
792
793         now = ktime_get_seconds();
794         deadline = jiffies_to_msecs(target->obd_recovery_timer.expires) /
795                    MSEC_PER_SEC;
796         if (now < deadline) {
797                 struct target_distribute_txn_data *tdtd;
798                 int size = 0;
799                 int count = 0;
800                 char *buf = NULL;
801
802                 timeout = deadline - now;
803                 tdtd = class_exp2tgt(exp)->lut_tdtd;
804                 if (tdtd && tdtd->tdtd_show_update_logs_retrievers)
805                         buf = tdtd->tdtd_show_update_logs_retrievers(
806                                 tdtd->tdtd_show_retrievers_cbdata,
807                                 &size, &count);
808
809                 if (count > 0)
810                         LCONSOLE_WARN("%s: Recovery already passed deadline "
811                                       "%lld:%.02lld. It is due to DNE recovery "
812                                       "failed/stuck on the %d MDT(s):%s. "
813                                       "Please wait until all MDTs recovered "
814                                       "or abort the recovery by force.\n",
815                                       target->obd_name, timeout / 60,
816                                       timeout % 60, count,
817                                       buf ? buf : "unknown (not enough RAM)");
818                 else
819                         LCONSOLE_WARN("%s: Recovery already passed deadline "
820                                       "%lld:%.02lld. If you do not want to wait "
821                                       "more, please abort the recovery by "
822                                       "force.\n", target->obd_name,
823                                       timeout / 60, timeout % 60);
824
825                 if (buf != NULL)
826                         OBD_FREE(buf, size);
827         } else {
828                 timeout = now - deadline;
829                 LCONSOLE_WARN("%s: Recovery already passed deadline"
830                         " %lld:%.02lld, It is most likely due to DNE"
831                         " recovery is failed or stuck, please wait a"
832                         " few more minutes or abort the recovery.\n",
833                         target->obd_name, timeout / 60, timeout % 60);
834         }
835
836 out_already:
837         conn->cookie = exp->exp_handle.h_cookie;
838         /* target_handle_connect() treats EALREADY and
839          * -EALREADY differently.  EALREADY means we are
840          * doing a valid reconnect from the same client. */
841         RETURN(EALREADY);
842 }
843
844 static void
845 check_and_start_recovery_timer(struct obd_device *obd,
846                                struct ptlrpc_request *req, int new_client);
847
848 /**
849  * update flags for import during reconnect process
850  */
851 static int rev_import_flags_update(struct obd_import *revimp,
852                                    struct ptlrpc_request *req)
853 {
854         int rc;
855         struct obd_connect_data *data;
856
857         data = req_capsule_client_get(&req->rq_pill, &RMF_CONNECT_DATA);
858
859         if (data->ocd_connect_flags & OBD_CONNECT_AT)
860                 revimp->imp_msghdr_flags |= MSGHDR_AT_SUPPORT;
861         else
862                 revimp->imp_msghdr_flags &= ~MSGHDR_AT_SUPPORT;
863
864         revimp->imp_msghdr_flags |= MSGHDR_CKSUM_INCOMPAT18;
865
866         rc = sptlrpc_import_sec_adapt(revimp, req->rq_svc_ctx, &req->rq_flvr);
867         if (rc) {
868                 CERROR("%s: cannot get reverse import %s security: rc = %d\n",
869                         revimp->imp_client->cli_name,
870                         libcfs_id2str(req->rq_peer), rc);
871                 return rc;
872         }
873
874         return 0;
875 }
876
877 /**
878  * Allocate a new reverse import for an export.
879  *
880  * \retval -errno in case error hit
881  * \retval 0 if reverse import correctly init
882  **/
883 int rev_import_init(struct obd_export *export)
884 {
885         struct obd_device *obd = export->exp_obd;
886         struct obd_import *revimp;
887
888         LASSERT(export->exp_imp_reverse == NULL);
889
890         revimp = class_new_import(obd);
891         if (revimp == NULL)
892                 return -ENOMEM;
893
894         revimp->imp_remote_handle.cookie = 0ULL;
895         revimp->imp_client = &obd->obd_ldlm_client;
896         revimp->imp_dlm_fake = 1;
897
898         /* it is safe to connect import in new state as no sends possible */
899         spin_lock(&export->exp_lock);
900         export->exp_imp_reverse = revimp;
901         spin_unlock(&export->exp_lock);
902         class_import_put(revimp);
903
904         return 0;
905 }
906 EXPORT_SYMBOL(rev_import_init);
907
908 /**
909  * Handle reconnect for an export.
910  *
911  * \param exp export to handle reconnect process
912  * \param req client reconnect request
913  *
914  * \retval -rc in case securitfy flavor can't be changed
915  * \retval 0 in case none problems
916  */
917 static int rev_import_reconnect(struct obd_export *exp,
918                                 struct ptlrpc_request *req)
919 {
920         struct obd_import *revimp = exp->exp_imp_reverse;
921         struct lustre_handle *lh;
922         int rc;
923
924         /* avoid sending a request until import flags are changed */
925         ptlrpc_import_enter_resend(revimp);
926
927         if (revimp->imp_connection != NULL)
928                 ptlrpc_connection_put(revimp->imp_connection);
929
930         /*
931          * client from recovery don't have a handle so we need to take from
932          * request. it may produce situation when wrong client connected
933          * to recovery as we trust a client uuid
934          */
935         lh = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
936         revimp->imp_remote_handle = *lh;
937
938         /* unknown versions will be caught in
939          * ptlrpc_handle_server_req_in->lustre_unpack_msg() */
940         revimp->imp_msg_magic = req->rq_reqmsg->lm_magic;
941
942         revimp->imp_connection = ptlrpc_connection_addref(exp->exp_connection);
943
944         rc = rev_import_flags_update(revimp, req);
945         if (rc != 0) {
946                 /* it is safe to still be in RECOVERY phase as we are not able
947                  * to setup correct security flavor so requests are not able to
948                  * be delivered correctly */
949                 return rc;
950         }
951
952         /* resend all rpc's via new connection */
953         return ptlrpc_import_recovery_state_machine(revimp);
954 }
955
956 int target_handle_connect(struct ptlrpc_request *req)
957 {
958         struct obd_device *target = NULL;
959         struct obd_export *export = NULL;
960         /* connect handle - filled from target_handle_reconnect in
961          * reconnect case */
962         struct lustre_handle conn;
963         struct lustre_handle *tmp;
964         struct obd_uuid cluuid;
965         char *str;
966         int rc = 0;
967         char *target_start;
968         int target_len;
969         bool     mds_conn = false, lw_client = false, initial_conn = false;
970         bool     mds_mds_conn = false;
971         bool     new_mds_mds_conn = false;
972         struct obd_connect_data *data, *tmpdata;
973         int size, tmpsize;
974         lnet_nid_t *client_nid = NULL;
975         ENTRY;
976
977         OBD_RACE(OBD_FAIL_TGT_CONN_RACE);
978
979         str = req_capsule_client_get(&req->rq_pill, &RMF_TGTUUID);
980         if (str == NULL) {
981                 DEBUG_REQ(D_ERROR, req, "bad target UUID for connect");
982                 GOTO(out, rc = -EINVAL);
983         }
984
985         target = class_dev_by_str(str);
986         if (!target) {
987                 deuuidify(str, NULL, &target_start, &target_len);
988                 LCONSOLE_ERROR_MSG(0x137, "%s: not available for connect "
989                                    "from %s (no target). If you are running "
990                                    "an HA pair check that the target is "
991                                    "mounted on the other server.\n", str,
992                                    libcfs_nid2str(req->rq_peer.nid));
993                 GOTO(out, rc = -ENODEV);
994         }
995
996         spin_lock(&target->obd_dev_lock);
997
998         target->obd_conn_inprogress++;
999
1000         if (target->obd_stopping || !target->obd_set_up) {
1001                 spin_unlock(&target->obd_dev_lock);
1002
1003                 deuuidify(str, NULL, &target_start, &target_len);
1004                 LCONSOLE_INFO("%.*s: Not available for connect from %s (%s)\n",
1005                               target_len, target_start,
1006                               libcfs_nid2str(req->rq_peer.nid),
1007                               (target->obd_stopping ?
1008                                "stopping" : "not set up"));
1009                 GOTO(out, rc = -ENODEV);
1010         }
1011
1012         if (target->obd_no_conn) {
1013                 spin_unlock(&target->obd_dev_lock);
1014
1015                 CDEBUG(D_INFO, "%s: Temporarily refusing client connection "
1016                                "from %s\n", target->obd_name,
1017                                libcfs_nid2str(req->rq_peer.nid));
1018                 GOTO(out, rc = -EAGAIN);
1019         }
1020
1021         spin_unlock(&target->obd_dev_lock);
1022
1023         str = req_capsule_client_get(&req->rq_pill, &RMF_CLUUID);
1024         if (str == NULL) {
1025                 DEBUG_REQ(D_ERROR, req, "bad client UUID for connect");
1026                 GOTO(out, rc = -EINVAL);
1027         }
1028
1029         obd_str2uuid(&cluuid, str);
1030
1031         tmp = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
1032         if (tmp == NULL)
1033                 GOTO(out, rc = -EPROTO);
1034
1035         conn = *tmp;
1036
1037         size = req_capsule_get_size(&req->rq_pill, &RMF_CONNECT_DATA,
1038                                     RCL_CLIENT);
1039         data = req_capsule_client_get(&req->rq_pill, &RMF_CONNECT_DATA);
1040         if (!data)
1041                 GOTO(out, rc = -EPROTO);
1042
1043         rc = req_capsule_server_pack(&req->rq_pill);
1044         if (rc)
1045                 GOTO(out, rc);
1046
1047 #if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(3, 0, 53, 0)
1048         /* Don't allow clients to connect that are using old 1.8 format
1049          * protocol conventions (LUSTRE_MSG_MAGIC_v1, !MSGHDR_CKSUM_INCOMPAT18,
1050          * ldlm_flock_policy_wire format, MDT_ATTR_xTIME_SET, etc).  The
1051          * FULL20 flag should be set on all connections since 2.0, but no
1052          * longer affects behaviour.
1053          *
1054          * Later this check will be disabled and the flag can be retired
1055          * completely once interop with 3.0 is no longer needed.
1056          */
1057         if (!(data->ocd_connect_flags & OBD_CONNECT_FULL20))
1058                 GOTO(out, rc = -EPROTO);
1059
1060         /* Don't allow liblustre clients to connect.
1061          * - testing was disabled in v2_2_50_0-61-g6a75d65
1062          * - building was disabled in v2_5_58_0-28-g7277179
1063          * - client code was deleted in v2_6_50_0-101-gcdfbc72,
1064          * - clients were refused connect for version difference > 0.0.1.32  */
1065         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
1066                 DEBUG_REQ(D_WARNING, req, "Refusing libclient connection");
1067                 GOTO(out, rc = -EPROTO);
1068         }
1069 #endif
1070
1071         /* Note: lw_client is needed in MDS-MDS failover during update log
1072          * processing, so we needs to allow lw_client to be connected at
1073          * anytime, instead of only the initial connection */
1074         lw_client = (data->ocd_connect_flags & OBD_CONNECT_LIGHTWEIGHT) != 0;
1075
1076         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_INITIAL) {
1077                 initial_conn = true;
1078                 mds_conn = (data->ocd_connect_flags & OBD_CONNECT_MDS) != 0;
1079                 mds_mds_conn = (data->ocd_connect_flags &
1080                                 OBD_CONNECT_MDS_MDS) != 0;
1081
1082                 /* OBD_CONNECT_MNE_SWAB is defined as OBD_CONNECT_MDS_MDS
1083                  * for Imperative Recovery connection from MGC to MGS.
1084                  *
1085                  * Via check OBD_CONNECT_FID, we can distinguish whether
1086                  * the OBD_CONNECT_MDS_MDS/OBD_CONNECT_MNE_SWAB is from
1087                  * MGC or MDT, since MGC does not use OBD_CONNECT_FID.
1088                  */
1089                 if (!lw_client &&
1090                     (data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) &&
1091                     (data->ocd_connect_flags & OBD_CONNECT_FID) &&
1092                     (data->ocd_connect_flags & OBD_CONNECT_VERSION)) {
1093                         __u32 major = OBD_OCD_VERSION_MAJOR(data->ocd_version);
1094                         __u32 minor = OBD_OCD_VERSION_MINOR(data->ocd_version);
1095                         __u32 patch = OBD_OCD_VERSION_PATCH(data->ocd_version);
1096
1097                         /* We do not support the MDT-MDT interoperations with
1098                          * different version MDT because of protocol changes. */
1099                         if (unlikely(major != LUSTRE_MAJOR ||
1100                                      minor != LUSTRE_MINOR ||
1101                                      abs(patch - LUSTRE_PATCH) > 3)) {
1102                                 LCONSOLE_WARN("%s (%u.%u.%u.%u) refused the "
1103                                         "connection from different version MDT "
1104                                         "(%d.%d.%d.%d) %s %s\n",
1105                                         target->obd_name, LUSTRE_MAJOR,
1106                                         LUSTRE_MINOR, LUSTRE_PATCH, LUSTRE_FIX,
1107                                         major, minor, patch,
1108                                         OBD_OCD_VERSION_FIX(data->ocd_version),
1109                                         libcfs_nid2str(req->rq_peer.nid), str);
1110
1111                                 GOTO(out, rc = -EPROTO);
1112                         }
1113                 }
1114         }
1115
1116         /* lctl gets a backstage, all-access pass. */
1117         if (obd_uuid_equals(&cluuid, &target->obd_uuid))
1118                 goto dont_check_exports;
1119
1120         export = cfs_hash_lookup(target->obd_uuid_hash, &cluuid);
1121         if (!export)
1122                 goto no_export;
1123
1124         /* We've found an export in the hash. */
1125
1126         spin_lock(&export->exp_lock);
1127
1128         if (export->exp_connecting) { /* bug 9635, et. al. */
1129                 spin_unlock(&export->exp_lock);
1130                 LCONSOLE_WARN("%s: Export %p already connecting from %s\n",
1131                               export->exp_obd->obd_name, export,
1132                               libcfs_nid2str(req->rq_peer.nid));
1133                 class_export_put(export);
1134                 export = NULL;
1135                 rc = -EALREADY;
1136         } else if ((mds_conn || (lw_client && initial_conn) ||
1137                    data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) &&
1138                    export->exp_connection != NULL) {
1139                 spin_unlock(&export->exp_lock);
1140                 if (req->rq_peer.nid != export->exp_connection->c_peer.nid) {
1141                         /* MDS or LWP reconnected after failover. */
1142                         LCONSOLE_WARN("%s: Received %s connection from "
1143                             "%s, removing former export from %s\n",
1144                             target->obd_name, mds_conn ? "MDS" : "LWP",
1145                             libcfs_nid2str(req->rq_peer.nid),
1146                             libcfs_nid2str(export->exp_connection->c_peer.nid));
1147                 } else {
1148                         /* New MDS connection from the same NID. */
1149                         LCONSOLE_WARN("%s: Received new %s connection from "
1150                                 "%s, removing former export from same NID\n",
1151                                 target->obd_name, mds_conn ? "MDS" : "LWP",
1152                                 libcfs_nid2str(req->rq_peer.nid));
1153                 }
1154
1155                 if (req->rq_peer.nid == export->exp_connection->c_peer.nid &&
1156                     data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) {
1157                         /* Because exports between MDTs will always be
1158                          * kept, let's do not fail such export if they
1159                          * come from the same NID, otherwise it might
1160                          * cause eviction between MDTs, which might
1161                          * cause namespace inconsistency */
1162                         spin_lock(&export->exp_lock);
1163                         export->exp_connecting = 1;
1164                         export->exp_conn_cnt = 0;
1165                         spin_unlock(&export->exp_lock);
1166                         conn.cookie = export->exp_handle.h_cookie;
1167                         rc = EALREADY;
1168                 } else {
1169                         class_fail_export(export);
1170                         class_export_put(export);
1171                         export = NULL;
1172                         rc = 0;
1173                 }
1174         } else if (export->exp_connection != NULL && initial_conn &&
1175                    req->rq_peer.nid != export->exp_connection->c_peer.nid) {
1176                 spin_unlock(&export->exp_lock);
1177                 /* In MDS failover we have static UUID but NID can change. */
1178                 LCONSOLE_WARN("%s: Client %s seen on new nid %s when "
1179                               "existing nid %s is already connected\n",
1180                               target->obd_name, cluuid.uuid,
1181                               libcfs_nid2str(req->rq_peer.nid),
1182                               libcfs_nid2str(
1183                                       export->exp_connection->c_peer.nid));
1184                 rc = -EALREADY;
1185                 class_export_put(export);
1186                 export = NULL;
1187         } else {
1188                 export->exp_connecting = 1;
1189                 spin_unlock(&export->exp_lock);
1190                 LASSERT(export->exp_obd == target);
1191
1192                 rc = target_handle_reconnect(&conn, export, &cluuid);
1193         }
1194
1195         /* If we found an export, we already unlocked. */
1196         if (!export) {
1197 no_export:
1198                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_CONNECT, 2 * obd_timeout);
1199         } else if (req->rq_export == NULL &&
1200                    atomic_read(&export->exp_rpc_count) > 0) {
1201                 LCONSOLE_WARN("%s: Client %s (at %s) refused connection, "
1202                               "still busy with %d references\n",
1203                               target->obd_name, cluuid.uuid,
1204                               libcfs_nid2str(req->rq_peer.nid),
1205                               atomic_read(&export->exp_refcount));
1206                         GOTO(out, rc = -EBUSY);
1207         } else if (lustre_msg_get_conn_cnt(req->rq_reqmsg) == 1 &&
1208                    rc != EALREADY) {
1209                 if (!strstr(cluuid.uuid, "mdt"))
1210                         LCONSOLE_WARN("%s: Rejecting reconnect from the "
1211                                       "known client %s (at %s) because it "
1212                                       "is indicating it is a new client",
1213                                       target->obd_name, cluuid.uuid,
1214                                       libcfs_nid2str(req->rq_peer.nid));
1215                 GOTO(out, rc = -EALREADY);
1216         } else {
1217                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_RECONNECT, 2 * obd_timeout);
1218         }
1219
1220         if (rc < 0) {
1221                 GOTO(out, rc);
1222         }
1223
1224         CDEBUG(D_HA, "%s: connection from %s@%s %st%llu exp %p cur %lld last %lld\n",
1225                target->obd_name, cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
1226                target->obd_recovering ? "recovering/" : "", data->ocd_transno,
1227                export, ktime_get_real_seconds(),
1228                export ? export->exp_last_request_time : 0);
1229
1230         /* If this is the first time a client connects, reset the recovery
1231          * timer. Discard lightweight connections which might be local. */
1232         if (!lw_client && rc == 0 && target->obd_recovering)
1233                 check_and_start_recovery_timer(target, req, export == NULL);
1234
1235         /* We want to handle EALREADY but *not* -EALREADY from
1236          * target_handle_reconnect(), return reconnection state in a flag. */
1237         if (rc == EALREADY) {
1238                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECONNECT);
1239                 rc = 0;
1240         } else {
1241                 LASSERT(rc == 0);
1242         }
1243
1244         /* Tell the client if we support replayable requests. */
1245         if (target->obd_replayable)
1246                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_REPLAYABLE);
1247         client_nid = &req->rq_peer.nid;
1248
1249         if (export == NULL) {
1250                 /* allow lightweight connections during recovery */
1251                 /* allow "new" MDT to be connected during recovery, since we
1252                  * need retrieve recovery update records from it */
1253                 if (target->obd_recovering && !lw_client && !mds_mds_conn) {
1254                         time64_t now;
1255                         time64_t t;
1256                         char *msg;
1257                         int c; /* connected */
1258                         int i; /* in progress */
1259                         int k; /* known */
1260                         int s; /* stale/evicted */
1261
1262                         c = atomic_read(&target->obd_connected_clients);
1263                         i = atomic_read(&target->obd_lock_replay_clients);
1264                         k = target->obd_max_recoverable_clients;
1265                         s = target->obd_stale_clients;
1266                         t = jiffies_to_msecs(target->obd_recovery_timer.expires);
1267                         t /= MSEC_PER_SEC;
1268                         now = ktime_get_seconds();
1269                         if (now > t) {
1270                                 t = now - t;
1271                                 msg = "already passed deadline";
1272                         } else {
1273                                 t -= now;
1274                                 msg = "to recover in";
1275                         }
1276
1277                         LCONSOLE_WARN("%s: Denying connection for new client %s"
1278                                       "(at %s), waiting for %d known clients "
1279                                       "(%d recovered, %d in progress, and %d "
1280                                       "evicted) %s %lld:%.02lld\n",
1281                                       target->obd_name, cluuid.uuid,
1282                                       libcfs_nid2str(req->rq_peer.nid), k,
1283                                       c - i, i, s, msg, t / 60, t % 60);
1284                         rc = -EBUSY;
1285                 } else {
1286 dont_check_exports:
1287                         rc = obd_connect(req->rq_svc_thread->t_env,
1288                                          &export, target, &cluuid, data,
1289                                          client_nid);
1290                         if (mds_conn && OBD_FAIL_CHECK(OBD_FAIL_TGT_RCVG_FLAG))
1291                                 lustre_msg_add_op_flags(req->rq_repmsg,
1292                                                         MSG_CONNECT_RECOVERING);
1293                         if (rc == 0) {
1294                                 conn.cookie = export->exp_handle.h_cookie;
1295                                 rc = rev_import_init(export);
1296                         }
1297
1298                         if (mds_mds_conn)
1299                                 new_mds_mds_conn = true;
1300                 }
1301         } else {
1302                 rc = obd_reconnect(req->rq_svc_thread->t_env,
1303                                    export, target, &cluuid, data, client_nid);
1304         }
1305         if (rc)
1306                 GOTO(out, rc);
1307
1308         LASSERT(target->u.obt.obt_magic == OBT_MAGIC);
1309         data->ocd_instance = target->u.obt.obt_instance;
1310
1311         /* Return only the parts of obd_connect_data that we understand, so the
1312          * client knows that we don't understand the rest. */
1313         if (data) {
1314                 tmpsize = req_capsule_get_size(&req->rq_pill, &RMF_CONNECT_DATA,
1315                                                RCL_SERVER);
1316                 tmpdata = req_capsule_server_get(&req->rq_pill,
1317                                                  &RMF_CONNECT_DATA);
1318                 /* Don't use struct assignment here, because the client reply
1319                  * buffer may be smaller/larger than the local struct
1320                  * obd_connect_data. */
1321                 memcpy(tmpdata, data, min(tmpsize, size));
1322         }
1323
1324         /* If the client and the server are the same node, we will already
1325          * have an export that really points to the client's DLM export,
1326          * because we have a shared handles table.
1327          *
1328          * XXX this will go away when shaver stops sending the "connect" handle
1329          * in the real "remote handle" field of the request --phik 24 Apr 2003
1330          */
1331         ptlrpc_request_change_export(req, export);
1332
1333         spin_lock(&export->exp_lock);
1334         if (export->exp_conn_cnt >= lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
1335                 spin_unlock(&export->exp_lock);
1336                 CDEBUG(D_RPCTRACE, "%s: %s already connected at greater "
1337                        "or equal conn_cnt: %d >= %d\n",
1338                        cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
1339                        export->exp_conn_cnt,
1340                        lustre_msg_get_conn_cnt(req->rq_reqmsg));
1341
1342                 GOTO(out, rc = -EALREADY);
1343         }
1344         LASSERT(lustre_msg_get_conn_cnt(req->rq_reqmsg) > 0);
1345         export->exp_conn_cnt = lustre_msg_get_conn_cnt(req->rq_reqmsg);
1346         spin_unlock(&export->exp_lock);
1347
1348         if (export->exp_connection != NULL) {
1349                 /* Check to see if connection came from another NID. */
1350                 if ((export->exp_connection->c_peer.nid != req->rq_peer.nid) &&
1351                     !hlist_unhashed(&export->exp_nid_hash))
1352                         cfs_hash_del(export->exp_obd->obd_nid_hash,
1353                                      &export->exp_connection->c_peer.nid,
1354                                      &export->exp_nid_hash);
1355
1356                 ptlrpc_connection_put(export->exp_connection);
1357         }
1358
1359         export->exp_connection = ptlrpc_connection_get(req->rq_peer,
1360                                                        req->rq_self,
1361                                                        &cluuid);
1362         if (hlist_unhashed(&export->exp_nid_hash))
1363                 cfs_hash_add(export->exp_obd->obd_nid_hash,
1364                              &export->exp_connection->c_peer.nid,
1365                              &export->exp_nid_hash);
1366
1367         lustre_msg_set_handle(req->rq_repmsg, &conn);
1368
1369         rc = rev_import_reconnect(export, req);
1370         if (rc != 0)
1371                 GOTO(out, rc);
1372
1373         if (target->obd_recovering && !export->exp_in_recovery && !lw_client) {
1374                 int has_transno;
1375                 __u64 transno = data->ocd_transno;
1376
1377                 spin_lock(&export->exp_lock);
1378                 /* possible race with class_disconnect_stale_exports,
1379                  * export may be already in the eviction process */
1380                 if (export->exp_failed) {
1381                         spin_unlock(&export->exp_lock);
1382                         GOTO(out, rc = -ENODEV);
1383                 }
1384                 export->exp_in_recovery = 1;
1385                 export->exp_req_replay_needed = 1;
1386                 export->exp_lock_replay_needed = 1;
1387                 spin_unlock(&export->exp_lock);
1388
1389                 has_transno = !!(lustre_msg_get_op_flags(req->rq_reqmsg) &
1390                                  MSG_CONNECT_TRANSNO);
1391                 if (has_transno && transno == 0)
1392                         CWARN("Connect with zero transno!\n");
1393
1394                 if (has_transno && transno > 0 &&
1395                     transno < target->obd_next_recovery_transno &&
1396                     transno > target->obd_last_committed) {
1397                         /* Another way is to use cmpxchg() to be lock-free. */
1398                         spin_lock(&target->obd_recovery_task_lock);
1399                         if (transno < target->obd_next_recovery_transno)
1400                                 target->obd_next_recovery_transno = transno;
1401                         spin_unlock(&target->obd_recovery_task_lock);
1402                 }
1403
1404                 atomic_inc(&target->obd_req_replay_clients);
1405                 atomic_inc(&target->obd_lock_replay_clients);
1406                 /* Note: MDS-MDS connection is allowed to be connected during
1407                  * recovery, no matter if the exports needs to be recoveried.
1408                  * Because we need retrieve updates logs from all other MDTs.
1409                  * So if the MDS-MDS export is new, obd_max_recoverable_clients
1410                  * also needs to be increased to match other recovery checking
1411                  * condition. */
1412                 if (new_mds_mds_conn)
1413                         target->obd_max_recoverable_clients++;
1414                 if (atomic_inc_return(&target->obd_connected_clients) ==
1415                     target->obd_max_recoverable_clients)
1416                         wake_up(&target->obd_next_transno_waitq);
1417         }
1418
1419         /* Tell the client we're in recovery, when client is involved in it. */
1420         if (target->obd_recovering && !lw_client)
1421                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECOVERING);
1422
1423 out:
1424         if (export) {
1425                 spin_lock(&export->exp_lock);
1426                 export->exp_connecting = 0;
1427                 spin_unlock(&export->exp_lock);
1428
1429                 class_export_put(export);
1430         }
1431         if (target != NULL) {
1432                 spin_lock(&target->obd_dev_lock);
1433                 target->obd_conn_inprogress--;
1434                 spin_unlock(&target->obd_dev_lock);
1435                 class_decref(target, "find", current);
1436         }
1437         req->rq_status = rc;
1438         RETURN(rc);
1439 }
1440
1441 int target_handle_disconnect(struct ptlrpc_request *req)
1442 {
1443         int rc;
1444         ENTRY;
1445
1446         rc = req_capsule_server_pack(&req->rq_pill);
1447         if (rc)
1448                 RETURN(rc);
1449
1450         /* Keep the rq_export around so we can send the reply. */
1451         req->rq_status = obd_disconnect(class_export_get(req->rq_export));
1452
1453         RETURN(0);
1454 }
1455
1456 void target_destroy_export(struct obd_export *exp)
1457 {
1458         struct obd_import       *imp = NULL;
1459         /* exports created from last_rcvd data, and "fake"
1460            exports created by lctl don't have an import */
1461         spin_lock(&exp->exp_lock);
1462         if (exp->exp_imp_reverse != NULL) {
1463                 imp = exp->exp_imp_reverse;
1464                 exp->exp_imp_reverse = NULL;
1465         }
1466         spin_unlock(&exp->exp_lock);
1467         if (imp != NULL)
1468                 client_destroy_import(imp);
1469
1470         LASSERT_ATOMIC_ZERO(&exp->exp_locks_count);
1471         LASSERT_ATOMIC_ZERO(&exp->exp_rpc_count);
1472         LASSERT_ATOMIC_ZERO(&exp->exp_cb_count);
1473         LASSERT_ATOMIC_ZERO(&exp->exp_replay_count);
1474 }
1475 EXPORT_SYMBOL(target_destroy_export);
1476
1477 /*
1478  * Recovery functions
1479  */
1480 static void target_request_copy_get(struct ptlrpc_request *req)
1481 {
1482         class_export_rpc_inc(req->rq_export);
1483         LASSERT(list_empty(&req->rq_list));
1484         INIT_LIST_HEAD(&req->rq_replay_list);
1485
1486         /* Increase refcount to keep request in queue. */
1487         atomic_inc(&req->rq_refcount);
1488         /* Let export know it has replays to be handled. */
1489         atomic_inc(&req->rq_export->exp_replay_count);
1490 }
1491
1492 static void target_request_copy_put(struct ptlrpc_request *req)
1493 {
1494         LASSERT(list_empty(&req->rq_replay_list));
1495         LASSERT_ATOMIC_POS(&req->rq_export->exp_replay_count);
1496
1497         atomic_dec(&req->rq_export->exp_replay_count);
1498         class_export_rpc_dec(req->rq_export);
1499         ptlrpc_server_drop_request(req);
1500 }
1501
1502 static int target_exp_enqueue_req_replay(struct ptlrpc_request *req)
1503 {
1504         __u64                  transno = lustre_msg_get_transno(req->rq_reqmsg);
1505         struct obd_export     *exp = req->rq_export;
1506         struct ptlrpc_request *reqiter;
1507         struct ptlrpc_request *dup_req = NULL;
1508         int                    dup = 0;
1509
1510         LASSERT(exp);
1511
1512         spin_lock(&exp->exp_lock);
1513         list_for_each_entry(reqiter, &exp->exp_req_replay_queue,
1514                                 rq_replay_list) {
1515                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) == transno) {
1516                         dup_req = reqiter;
1517                         dup = 1;
1518                         break;
1519                 }
1520         }
1521
1522         if (dup) {
1523                 /* We expect it with RESENT and REPLAY flags. */
1524                 if ((lustre_msg_get_flags(req->rq_reqmsg) &
1525                      (MSG_RESENT | MSG_REPLAY)) != (MSG_RESENT | MSG_REPLAY))
1526                         CERROR("invalid flags %x of resent replay\n",
1527                                lustre_msg_get_flags(req->rq_reqmsg));
1528
1529                 if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY) {
1530                         __u32 new_conn;
1531
1532                         new_conn = lustre_msg_get_conn_cnt(req->rq_reqmsg);
1533                         if (new_conn >
1534                             lustre_msg_get_conn_cnt(dup_req->rq_reqmsg))
1535                                 lustre_msg_set_conn_cnt(dup_req->rq_reqmsg,
1536                                                         new_conn);
1537                 }
1538         } else {
1539                 list_add_tail(&req->rq_replay_list,
1540                                   &exp->exp_req_replay_queue);
1541         }
1542
1543         spin_unlock(&exp->exp_lock);
1544         return dup;
1545 }
1546
1547 static void target_exp_dequeue_req_replay(struct ptlrpc_request *req)
1548 {
1549         LASSERT(!list_empty(&req->rq_replay_list));
1550         LASSERT(req->rq_export);
1551
1552         spin_lock(&req->rq_export->exp_lock);
1553         list_del_init(&req->rq_replay_list);
1554         spin_unlock(&req->rq_export->exp_lock);
1555 }
1556
1557 static void target_finish_recovery(struct lu_target *lut)
1558 {
1559         struct obd_device *obd = lut->lut_obd;
1560         ENTRY;
1561
1562         /* Only log a recovery message when recovery has occurred. */
1563         if (obd->obd_recovery_start) {
1564                 time64_t now = ktime_get_real_seconds();
1565                 time64_t elapsed_time;
1566
1567                 elapsed_time = max_t(time64_t, now - obd->obd_recovery_start, 1);
1568                 LCONSOLE_INFO("%s: Recovery over after %lld:%.02lld, of %d clients "
1569                         "%d recovered and %d %s evicted.\n", obd->obd_name,
1570                         (s64)elapsed_time / 60, (s64)elapsed_time % 60,
1571                         obd->obd_max_recoverable_clients,
1572                         atomic_read(&obd->obd_connected_clients),
1573                         obd->obd_stale_clients,
1574                         obd->obd_stale_clients == 1 ? "was" : "were");
1575         }
1576
1577         ldlm_reprocess_recovery_done(obd->obd_namespace);
1578         spin_lock(&obd->obd_recovery_task_lock);
1579         if (!list_empty(&obd->obd_req_replay_queue) ||
1580             !list_empty(&obd->obd_lock_replay_queue) ||
1581             !list_empty(&obd->obd_final_req_queue)) {
1582                 CERROR("%s: Recovery queues ( %s%s%s) are not empty\n",
1583                        obd->obd_name,
1584                        list_empty(&obd->obd_req_replay_queue) ? "" : "req ",
1585                        list_empty(&obd->obd_lock_replay_queue) ? \
1586                                "" : "lock ",
1587                        list_empty(&obd->obd_final_req_queue) ? \
1588                                "" : "final ");
1589                 spin_unlock(&obd->obd_recovery_task_lock);
1590                 LBUG();
1591         }
1592         spin_unlock(&obd->obd_recovery_task_lock);
1593
1594         obd->obd_recovery_end = ktime_get_real_seconds();
1595
1596         /* When recovery finished, cleanup orphans on MDS and OST. */
1597         if (obd->obd_type && OBP(obd, postrecov)) {
1598                 int rc = OBP(obd, postrecov)(obd);
1599
1600                 if (rc < 0)
1601                         LCONSOLE_WARN("%s: Post recovery failed, rc %d\n",
1602                                       obd->obd_name, rc);
1603         }
1604         EXIT;
1605 }
1606
1607 static void abort_req_replay_queue(struct obd_device *obd)
1608 {
1609         struct ptlrpc_request *req, *n;
1610         struct list_head abort_list;
1611
1612         INIT_LIST_HEAD(&abort_list);
1613         spin_lock(&obd->obd_recovery_task_lock);
1614         list_splice_init(&obd->obd_req_replay_queue, &abort_list);
1615         spin_unlock(&obd->obd_recovery_task_lock);
1616         list_for_each_entry_safe(req, n, &abort_list, rq_list) {
1617                 DEBUG_REQ(D_WARNING, req, "aborted:");
1618                 req->rq_status = -ENOTCONN;
1619                 if (ptlrpc_error(req)) {
1620                         DEBUG_REQ(D_ERROR, req,
1621                                   "failed abort_req_reply; skipping");
1622                 }
1623                 target_exp_dequeue_req_replay(req);
1624                 target_request_copy_put(req);
1625         }
1626 }
1627
1628 static void abort_lock_replay_queue(struct obd_device *obd)
1629 {
1630         struct ptlrpc_request *req, *n;
1631         struct list_head abort_list;
1632
1633         INIT_LIST_HEAD(&abort_list);
1634         spin_lock(&obd->obd_recovery_task_lock);
1635         list_splice_init(&obd->obd_lock_replay_queue, &abort_list);
1636         spin_unlock(&obd->obd_recovery_task_lock);
1637         list_for_each_entry_safe(req, n, &abort_list, rq_list) {
1638                 DEBUG_REQ(D_ERROR, req, "aborted:");
1639                 req->rq_status = -ENOTCONN;
1640                 if (ptlrpc_error(req)) {
1641                         DEBUG_REQ(D_ERROR, req,
1642                                   "failed abort_lock_reply; skipping");
1643                 }
1644                 target_request_copy_put(req);
1645         }
1646 }
1647
1648 /* Called from a cleanup function if the device is being cleaned up
1649    forcefully.  The exports should all have been disconnected already,
1650    the only thing left to do is
1651      - clear the recovery flags
1652      - cancel the timer
1653      - free queued requests and replies, but don't send replies
1654    Because the obd_stopping flag is set, no new requests should be received.
1655
1656 */
1657 void target_cleanup_recovery(struct obd_device *obd)
1658 {
1659         struct ptlrpc_request *req, *n;
1660         struct list_head clean_list;
1661
1662         INIT_LIST_HEAD(&clean_list);
1663         spin_lock(&obd->obd_dev_lock);
1664         if (!obd->obd_recovering) {
1665                 spin_unlock(&obd->obd_dev_lock);
1666                 EXIT;
1667                 return;
1668         }
1669         obd->obd_recovering = obd->obd_abort_recovery = 0;
1670         spin_unlock(&obd->obd_dev_lock);
1671
1672         spin_lock(&obd->obd_recovery_task_lock);
1673         target_cancel_recovery_timer(obd);
1674         list_splice_init(&obd->obd_req_replay_queue, &clean_list);
1675         spin_unlock(&obd->obd_recovery_task_lock);
1676
1677         list_for_each_entry_safe(req, n, &clean_list, rq_list) {
1678                 LASSERT(req->rq_reply_state == NULL);
1679                 target_exp_dequeue_req_replay(req);
1680                 target_request_copy_put(req);
1681         }
1682
1683         spin_lock(&obd->obd_recovery_task_lock);
1684         list_splice_init(&obd->obd_lock_replay_queue, &clean_list);
1685         list_splice_init(&obd->obd_final_req_queue, &clean_list);
1686         spin_unlock(&obd->obd_recovery_task_lock);
1687
1688         list_for_each_entry_safe(req, n, &clean_list, rq_list) {
1689                 LASSERT(req->rq_reply_state == NULL);
1690                 target_request_copy_put(req);
1691         }
1692
1693         EXIT;
1694 }
1695 EXPORT_SYMBOL(target_cleanup_recovery);
1696
1697 /* obd_recovery_task_lock should be held */
1698 void target_cancel_recovery_timer(struct obd_device *obd)
1699 {
1700         CDEBUG(D_HA, "%s: cancel recovery timer\n", obd->obd_name);
1701         del_timer(&obd->obd_recovery_timer);
1702 }
1703
1704 static void target_start_recovery_timer(struct obd_device *obd)
1705 {
1706         if (obd->obd_recovery_start != 0)
1707                 return;
1708
1709         spin_lock(&obd->obd_dev_lock);
1710         if (!obd->obd_recovering || obd->obd_abort_recovery) {
1711                 spin_unlock(&obd->obd_dev_lock);
1712                 return;
1713         }
1714
1715         LASSERT(obd->obd_recovery_timeout != 0);
1716
1717         if (obd->obd_recovery_start != 0) {
1718                 spin_unlock(&obd->obd_dev_lock);
1719                 return;
1720         }
1721
1722         mod_timer(&obd->obd_recovery_timer,
1723                   jiffies + cfs_time_seconds(obd->obd_recovery_timeout));
1724         obd->obd_recovery_start = ktime_get_real_seconds();
1725         spin_unlock(&obd->obd_dev_lock);
1726
1727         LCONSOLE_WARN("%s: Will be in recovery for at least %llu:%02llu, or until %d client%s reconnect%s\n",
1728                       obd->obd_name,
1729                       obd->obd_recovery_timeout / 60,
1730                       obd->obd_recovery_timeout % 60,
1731                       obd->obd_max_recoverable_clients,
1732                       (obd->obd_max_recoverable_clients == 1) ? "" : "s",
1733                       (obd->obd_max_recoverable_clients == 1) ? "s": "");
1734 }
1735
1736 /**
1737  * extend recovery window.
1738  *
1739  * if @extend is true, extend recovery window to have @drt remaining at least;
1740  * otherwise, make sure the recovery timeout value is not less than @drt.
1741  */
1742 static void extend_recovery_timer(struct obd_device *obd, time64_t drt,
1743                                   bool extend)
1744 {
1745         time64_t now;
1746         time64_t end;
1747         time64_t left;
1748         time64_t to;
1749
1750         spin_lock(&obd->obd_dev_lock);
1751         if (!obd->obd_recovering || obd->obd_abort_recovery) {
1752                 spin_unlock(&obd->obd_dev_lock);
1753                 return;
1754         }
1755         LASSERT(obd->obd_recovery_start != 0);
1756
1757         now = ktime_get_real_seconds();
1758         to = obd->obd_recovery_timeout;
1759         end = obd->obd_recovery_start + to;
1760         left = end - now;
1761
1762         if (extend && (drt > left)) {
1763                 to += drt - left;
1764         } else if (!extend && (drt > to)) {
1765                 to = drt;
1766         }
1767
1768         if (to > obd->obd_recovery_time_hard) {
1769                 to = obd->obd_recovery_time_hard;
1770                 CWARN("%s: extended recovery timer reaching hard limit: %lld, extend: %d\n",
1771                       obd->obd_name, to, extend);
1772         }
1773
1774         if (obd->obd_recovery_timeout < to) {
1775                 obd->obd_recovery_timeout = to;
1776                 end = obd->obd_recovery_start + to;
1777                 mod_timer(&obd->obd_recovery_timer,
1778                           jiffies + cfs_time_seconds(end - now));
1779         }
1780         spin_unlock(&obd->obd_dev_lock);
1781
1782         CDEBUG(D_HA, "%s: recovery timer will expire in %lld seconds\n",
1783                 obd->obd_name, (s64)(end - now));
1784 }
1785
1786 /* Reset the timer with each new client connection */
1787 /*
1788  * This timer is actually reconnect_timer, which is for making sure
1789  * the total recovery window is at least as big as my reconnect
1790  * attempt timing. So the initial recovery time_out will be set to
1791  * OBD_RECOVERY_FACTOR * obd_timeout. If the timeout coming
1792  * from client is bigger than this, then the recovery time_out will
1793  * be extended to make sure the client could be reconnected, in the
1794  * process, the timeout from the new client should be ignored.
1795  */
1796
1797 static void
1798 check_and_start_recovery_timer(struct obd_device *obd,
1799                                struct ptlrpc_request *req,
1800                                int new_client)
1801 {
1802         time64_t service_time = lustre_msg_get_service_time(req->rq_reqmsg);
1803         struct obd_device_target *obt = &obd->u.obt;
1804
1805         if (!new_client && service_time)
1806                 /* Teach server about old server's estimates, as first guess
1807                  * at how long new requests will take. */
1808                 at_measured(&req->rq_rqbd->rqbd_svcpt->scp_at_estimate,
1809                             service_time);
1810
1811         target_start_recovery_timer(obd);
1812
1813         /* Convert the service time to RPC timeout,
1814          * and reuse service_time to limit stack usage.
1815          */
1816         service_time = at_est2timeout(service_time);
1817
1818         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_SLUGGISH_NET) &&
1819             service_time < at_extra)
1820                 service_time = at_extra;
1821
1822         /* We expect other clients to timeout within service_time, then try
1823          * to reconnect, then try the failover server.  The max delay between
1824          * connect attempts is SWITCH_MAX + SWITCH_INC + INITIAL. */
1825         service_time += 2 * INITIAL_CONNECT_TIMEOUT;
1826
1827         LASSERT(obt->obt_magic == OBT_MAGIC);
1828         service_time += 2 * (CONNECTION_SWITCH_MAX + CONNECTION_SWITCH_INC);
1829         if (service_time > obd->obd_recovery_timeout && !new_client)
1830                 extend_recovery_timer(obd, service_time, false);
1831 }
1832
1833 /** Health checking routines */
1834 static inline int exp_connect_healthy(struct obd_export *exp)
1835 {
1836         return (exp->exp_in_recovery);
1837 }
1838
1839 /** if export done req_replay or has replay in queue */
1840 static inline int exp_req_replay_healthy(struct obd_export *exp)
1841 {
1842         return (!exp->exp_req_replay_needed ||
1843                 atomic_read(&exp->exp_replay_count) > 0);
1844 }
1845
1846
1847 static inline int exp_req_replay_healthy_or_from_mdt(struct obd_export *exp)
1848 {
1849         return (exp_connect_flags(exp) & OBD_CONNECT_MDS_MDS) ||
1850                exp_req_replay_healthy(exp);
1851 }
1852
1853 /** if export done lock_replay or has replay in queue */
1854 static inline int exp_lock_replay_healthy(struct obd_export *exp)
1855 {
1856         return (!exp->exp_lock_replay_needed ||
1857                 atomic_read(&exp->exp_replay_count) > 0);
1858 }
1859
1860 static inline int exp_vbr_healthy(struct obd_export *exp)
1861 {
1862         return (!exp->exp_vbr_failed);
1863 }
1864
1865 static inline int exp_finished(struct obd_export *exp)
1866 {
1867         return (exp->exp_in_recovery && !exp->exp_lock_replay_needed);
1868 }
1869
1870 static inline int exp_finished_or_from_mdt(struct obd_export *exp)
1871 {
1872         return (exp_connect_flags(exp) & OBD_CONNECT_MDS_MDS) ||
1873                 exp_finished(exp);
1874 }
1875
1876 static int check_for_next_transno(struct lu_target *lut)
1877 {
1878         struct ptlrpc_request *req = NULL;
1879         struct obd_device *obd = lut->lut_obd;
1880         struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
1881         int wake_up = 0, connected, completed, queue_len;
1882         __u64 req_transno = 0;
1883         __u64 update_transno = 0;
1884         __u64 next_transno = 0;
1885         ENTRY;
1886
1887         spin_lock(&obd->obd_recovery_task_lock);
1888         if (!list_empty(&obd->obd_req_replay_queue)) {
1889                 req = list_entry(obd->obd_req_replay_queue.next,
1890                                      struct ptlrpc_request, rq_list);
1891                 req_transno = lustre_msg_get_transno(req->rq_reqmsg);
1892         }
1893
1894         if (tdtd != NULL)
1895                 update_transno = distribute_txn_get_next_transno(tdtd);
1896
1897         connected = atomic_read(&obd->obd_connected_clients);
1898         completed = connected - atomic_read(&obd->obd_req_replay_clients);
1899         queue_len = obd->obd_requests_queued_for_recovery;
1900         next_transno = obd->obd_next_recovery_transno;
1901
1902         CDEBUG(D_HA, "max: %d, connected: %d, completed: %d, queue_len: %d, "
1903                "req_transno: %llu, next_transno: %llu\n",
1904                obd->obd_max_recoverable_clients, connected, completed,
1905                queue_len, req_transno, next_transno);
1906
1907         if (obd->obd_abort_recovery) {
1908                 CDEBUG(D_HA, "waking for aborted recovery\n");
1909                 wake_up = 1;
1910         } else if (obd->obd_recovery_expired) {
1911                 CDEBUG(D_HA, "waking for expired recovery\n");
1912                 wake_up = 1;
1913         } else if (tdtd != NULL && req != NULL &&
1914                    is_req_replayed_by_update(req)) {
1915                 LASSERTF(req_transno < next_transno, "req_transno %llu"
1916                          "next_transno%llu\n", req_transno, next_transno);
1917                 CDEBUG(D_HA, "waking for duplicate req (%llu)\n",
1918                        req_transno);
1919                 wake_up = 1;
1920         } else if (req_transno == next_transno ||
1921                    (update_transno != 0 && update_transno <= next_transno)) {
1922                 CDEBUG(D_HA, "waking for next (%lld)\n", next_transno);
1923                 wake_up = 1;
1924         } else if (queue_len > 0 &&
1925                    queue_len == atomic_read(&obd->obd_req_replay_clients)) {
1926                 /** handle gaps occured due to lost reply or VBR */
1927                 LASSERTF(req_transno >= next_transno,
1928                          "req_transno: %llu, next_transno: %llu\n",
1929                          req_transno, next_transno);
1930                 CDEBUG(D_HA,
1931                        "%s: waking for gap in transno, VBR is %s (skip: "
1932                        "%lld, ql: %d, comp: %d, conn: %d, next: %lld"
1933                        ", next_update %lld last_committed: %lld)\n",
1934                        obd->obd_name, obd->obd_version_recov ? "ON" : "OFF",
1935                        next_transno, queue_len, completed, connected,
1936                        req_transno, update_transno, obd->obd_last_committed);
1937                 obd->obd_next_recovery_transno = req_transno;
1938                 wake_up = 1;
1939         } else if (atomic_read(&obd->obd_req_replay_clients) == 0) {
1940                 CDEBUG(D_HA, "waking for completed recovery\n");
1941                 wake_up = 1;
1942         } else if (OBD_FAIL_CHECK(OBD_FAIL_MDS_RECOVERY_ACCEPTS_GAPS)) {
1943                 CDEBUG(D_HA, "accepting transno gaps is explicitly allowed"
1944                        " by fail_lock, waking up (%lld)\n", next_transno);
1945                 obd->obd_next_recovery_transno = req_transno;
1946                 wake_up = 1;
1947         }
1948         spin_unlock(&obd->obd_recovery_task_lock);
1949         return wake_up;
1950 }
1951
1952 static int check_for_next_lock(struct lu_target *lut)
1953 {
1954         struct obd_device *obd = lut->lut_obd;
1955         int wake_up = 0;
1956
1957         spin_lock(&obd->obd_recovery_task_lock);
1958         if (!list_empty(&obd->obd_lock_replay_queue)) {
1959                 CDEBUG(D_HA, "waking for next lock\n");
1960                 wake_up = 1;
1961         } else if (atomic_read(&obd->obd_lock_replay_clients) == 0) {
1962                 CDEBUG(D_HA, "waking for completed lock replay\n");
1963                 wake_up = 1;
1964         } else if (obd->obd_abort_recovery) {
1965                 CDEBUG(D_HA, "waking for aborted recovery\n");
1966                 wake_up = 1;
1967         } else if (obd->obd_recovery_expired) {
1968                 CDEBUG(D_HA, "waking for expired recovery\n");
1969                 wake_up = 1;
1970         }
1971         spin_unlock(&obd->obd_recovery_task_lock);
1972
1973         return wake_up;
1974 }
1975
1976 /**
1977  * wait for recovery events,
1978  * check its status with help of check_routine
1979  * evict dead clients via health_check
1980  */
1981 static int target_recovery_overseer(struct lu_target *lut,
1982                                     int (*check_routine)(struct lu_target *),
1983                                     int (*health_check)(struct obd_export *))
1984 {
1985         struct obd_device       *obd = lut->lut_obd;
1986         struct target_distribute_txn_data *tdtd;
1987         time64_t last = 0;
1988         time64_t now;
1989 repeat:
1990         if (obd->obd_recovering && obd->obd_recovery_start == 0) {
1991                 now = ktime_get_seconds();
1992                 if (now - last > 600) {
1993                         LCONSOLE_INFO("%s: in recovery but waiting for "
1994                                       "the first client to connect\n",
1995                                       obd->obd_name);
1996                         last = now;
1997                 }
1998         }
1999         if (obd->obd_recovery_start != 0 && ktime_get_real_seconds() >=
2000               (obd->obd_recovery_start + obd->obd_recovery_time_hard)) {
2001                 __u64 next_update_transno = 0;
2002
2003                 /* Only abort the recovery if there are no update recovery
2004                  * left in the queue */
2005                 spin_lock(&obd->obd_recovery_task_lock);
2006                 if (lut->lut_tdtd != NULL) {
2007                         next_update_transno =
2008                                 distribute_txn_get_next_transno(lut->lut_tdtd);
2009
2010                         tdtd = lut->lut_tdtd;
2011                         /* If next_update_transno == 0, it probably because
2012                          * updatelog retrieve threads did not get any records
2013                          * yet, let's wait those threads stopped */
2014                         if (next_update_transno == 0) {
2015                                 struct l_wait_info lwi = { 0 };
2016
2017                                 l_wait_event(tdtd->tdtd_recovery_threads_waitq,
2018                                        atomic_read(
2019                                        &tdtd->tdtd_recovery_threads_count) == 0,
2020                                        &lwi);
2021
2022                                 next_update_transno =
2023                                         distribute_txn_get_next_transno(
2024                                                                 lut->lut_tdtd);
2025                         }
2026                 }
2027
2028                 if (next_update_transno != 0 && !obd->obd_abort_recovery) {
2029                         obd->obd_next_recovery_transno = next_update_transno;
2030                         spin_unlock(&obd->obd_recovery_task_lock);
2031                         /* Disconnect unfinished exports from clients, and
2032                          * keep connection from MDT to make sure the update
2033                          * recovery will still keep trying until some one
2034                          * manually abort the recovery */
2035                         class_disconnect_stale_exports(obd,
2036                                                 exp_finished_or_from_mdt);
2037                         /* Abort all of replay and replay lock req from
2038                          * clients */
2039                         abort_req_replay_queue(obd);
2040                         abort_lock_replay_queue(obd);
2041                         CDEBUG(D_HA, "%s: there are still update replay (%#llx"
2042                                ")in the queue.\n", obd->obd_name,
2043                                next_update_transno);
2044                 } else {
2045                         obd->obd_abort_recovery = 1;
2046                         spin_unlock(&obd->obd_recovery_task_lock);
2047                         CWARN("%s recovery is aborted by hard timeout\n",
2048                               obd->obd_name);
2049                 }
2050         }
2051
2052         while (wait_event_timeout(obd->obd_next_transno_waitq,
2053                                   check_routine(lut),
2054                                   msecs_to_jiffies(60 * MSEC_PER_SEC)) == 0)
2055                 /* wait indefinitely for event, but don't trigger watchdog */;
2056
2057         if (obd->obd_abort_recovery) {
2058                 CWARN("recovery is aborted, evict exports in recovery\n");
2059                 if (lut->lut_tdtd != NULL) {
2060                         struct l_wait_info lwi = { 0 };
2061
2062                         tdtd = lut->lut_tdtd;
2063                         /* Let's wait all of the update log recovery thread
2064                          * finished */
2065                         l_wait_event(tdtd->tdtd_recovery_threads_waitq,
2066                          atomic_read(&tdtd->tdtd_recovery_threads_count) == 0,
2067                              &lwi);
2068                         /* Then abort the update recovery list */
2069                         dtrq_list_destroy(lut->lut_tdtd);
2070                 }
2071
2072                 /** evict exports which didn't finish recovery yet */
2073                 class_disconnect_stale_exports(obd, exp_finished);
2074                 return 1;
2075         } else if (obd->obd_recovery_expired) {
2076                 obd->obd_recovery_expired = 0;
2077                 /** If some clients died being recovered, evict them */
2078                 LCONSOLE_WARN("%s: recovery is timed out, "
2079                               "evict stale exports\n", obd->obd_name);
2080                 /** evict cexports with no replay in queue, they are stalled */
2081                 class_disconnect_stale_exports(obd, health_check);
2082
2083                 /** continue with VBR */
2084                 spin_lock(&obd->obd_dev_lock);
2085                 obd->obd_version_recov = 1;
2086                 spin_unlock(&obd->obd_dev_lock);
2087                 /**
2088                  * reset timer, recovery will proceed with versions now,
2089                  * timeout is set just to handle reconnection delays
2090                  */
2091                 extend_recovery_timer(obd, RECONNECT_DELAY_MAX, true);
2092                 /** Wait for recovery events again, after evicting bad clients */
2093                 goto repeat;
2094         }
2095         return 0;
2096 }
2097
2098 static struct ptlrpc_request *target_next_replay_lock(struct lu_target *lut)
2099 {
2100         struct obd_device       *obd = lut->lut_obd;
2101         struct ptlrpc_request *req = NULL;
2102
2103         CDEBUG(D_HA, "Waiting for lock\n");
2104         if (target_recovery_overseer(lut, check_for_next_lock,
2105                                      exp_lock_replay_healthy))
2106                 abort_lock_replay_queue(obd);
2107
2108         spin_lock(&obd->obd_recovery_task_lock);
2109         if (!list_empty(&obd->obd_lock_replay_queue)) {
2110                 req = list_entry(obd->obd_lock_replay_queue.next,
2111                                      struct ptlrpc_request, rq_list);
2112                 list_del_init(&req->rq_list);
2113                 spin_unlock(&obd->obd_recovery_task_lock);
2114         } else {
2115                 spin_unlock(&obd->obd_recovery_task_lock);
2116                 LASSERT(list_empty(&obd->obd_lock_replay_queue));
2117                 LASSERT(atomic_read(&obd->obd_lock_replay_clients) == 0);
2118                 /** evict exports failed VBR */
2119                 class_disconnect_stale_exports(obd, exp_vbr_healthy);
2120         }
2121         return req;
2122 }
2123
2124 static struct ptlrpc_request *target_next_final_ping(struct obd_device *obd)
2125 {
2126         struct ptlrpc_request *req = NULL;
2127
2128         spin_lock(&obd->obd_recovery_task_lock);
2129         if (!list_empty(&obd->obd_final_req_queue)) {
2130                 req = list_entry(obd->obd_final_req_queue.next,
2131                                      struct ptlrpc_request, rq_list);
2132                 list_del_init(&req->rq_list);
2133                 spin_unlock(&obd->obd_recovery_task_lock);
2134                 if (req->rq_export->exp_in_recovery) {
2135                         spin_lock(&req->rq_export->exp_lock);
2136                         req->rq_export->exp_in_recovery = 0;
2137                         spin_unlock(&req->rq_export->exp_lock);
2138                 }
2139         } else {
2140                 spin_unlock(&obd->obd_recovery_task_lock);
2141         }
2142         return req;
2143 }
2144
2145 static void handle_recovery_req(struct ptlrpc_thread *thread,
2146                                 struct ptlrpc_request *req,
2147                                 svc_handler_t handler)
2148 {
2149         ENTRY;
2150
2151         /**
2152          * export can be evicted during recovery, no need to handle replays for
2153          * it after that, discard such request silently
2154          */
2155         if (req->rq_export->exp_disconnected)
2156                 RETURN_EXIT;
2157
2158         req->rq_session.lc_thread = thread;
2159         req->rq_svc_thread = thread;
2160         req->rq_svc_thread->t_env->le_ses = &req->rq_session;
2161
2162         /* thread context */
2163         lu_context_enter(&thread->t_env->le_ctx);
2164         (void)handler(req);
2165         lu_context_exit(&thread->t_env->le_ctx);
2166
2167         /* don't reset timer for final stage */
2168         if (!exp_finished(req->rq_export)) {
2169                 time64_t to = obd_timeout;
2170
2171                 /**
2172                  * Add request timeout to the recovery time so next request from
2173                  * this client may come in recovery time
2174                  */
2175                 if (!AT_OFF) {
2176                         struct ptlrpc_service_part *svcpt;
2177
2178                         svcpt = req->rq_rqbd->rqbd_svcpt;
2179                         /* If the server sent early reply for this request,
2180                          * the client will recalculate the timeout according to
2181                          * current server estimate service time, so we will
2182                          * use the maxium timeout here for waiting the client
2183                          * sending the next req */
2184                         to = max((int)at_est2timeout(
2185                                  at_get(&svcpt->scp_at_estimate)),
2186                                  (int)lustre_msg_get_timeout(req->rq_reqmsg));
2187                         /* Add 2 net_latency, one for balance rq_deadline
2188                          * (see ptl_send_rpc), one for resend the req to server,
2189                          * Note: client will pack net_latency in replay req
2190                          * (see ptlrpc_replay_req) */
2191                         to += 2 * lustre_msg_get_service_time(req->rq_reqmsg);
2192                 }
2193                 extend_recovery_timer(class_exp2obd(req->rq_export), to, true);
2194         }
2195         EXIT;
2196 }
2197
2198 /** Checking routines for recovery */
2199 static int check_for_recovery_ready(struct lu_target *lut)
2200 {
2201         struct obd_device *obd = lut->lut_obd;
2202         unsigned int clnts = atomic_read(&obd->obd_connected_clients);
2203
2204         CDEBUG(D_HA, "connected %d stale %d max_recoverable_clients %d"
2205                " abort %d expired %d\n", clnts, obd->obd_stale_clients,
2206                obd->obd_max_recoverable_clients, obd->obd_abort_recovery,
2207                obd->obd_recovery_expired);
2208
2209         if (!obd->obd_abort_recovery && !obd->obd_recovery_expired) {
2210                 LASSERT(clnts <= obd->obd_max_recoverable_clients);
2211                 if (clnts + obd->obd_stale_clients <
2212                     obd->obd_max_recoverable_clients)
2213                         return 0;
2214         }
2215
2216         if (lut->lut_tdtd != NULL) {
2217                 if (!lut->lut_tdtd->tdtd_replay_ready &&
2218                     !obd->obd_abort_recovery) {
2219                         /* Let's extend recovery timer, in case the recovery
2220                          * timer expired, and some clients got evicted */
2221                         extend_recovery_timer(obd, obd->obd_recovery_timeout,
2222                                               true);
2223                         CDEBUG(D_HA, "%s update recovery is not ready, extend recovery %llu\n",
2224                                obd->obd_name, obd->obd_recovery_timeout);
2225                         return 0;
2226                 }
2227         }
2228
2229         return 1;
2230 }
2231
2232 enum {
2233         REQUEST_RECOVERY = 1,
2234         UPDATE_RECOVERY = 2,
2235 };
2236
2237 static __u64 get_next_replay_req_transno(struct obd_device *obd)
2238 {
2239         __u64 transno = 0;
2240
2241         if (!list_empty(&obd->obd_req_replay_queue)) {
2242                 struct ptlrpc_request *req;
2243
2244                 req = list_entry(obd->obd_req_replay_queue.next,
2245                                  struct ptlrpc_request, rq_list);
2246                 transno = lustre_msg_get_transno(req->rq_reqmsg);
2247         }
2248
2249         return transno;
2250 }
2251
2252 static __u64 get_next_transno(struct lu_target *lut, int *type)
2253 {
2254         struct obd_device *obd = lut->lut_obd;
2255         struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
2256         __u64 transno = 0;
2257         __u64 update_transno;
2258         ENTRY;
2259
2260         transno = get_next_replay_req_transno(obd);
2261         if (type != NULL)
2262                 *type = REQUEST_RECOVERY;
2263
2264         if (tdtd == NULL)
2265                 RETURN(transno);
2266
2267         update_transno = distribute_txn_get_next_transno(tdtd);
2268         if (transno == 0 || (transno >= update_transno &&
2269                              update_transno != 0)) {
2270                 transno = update_transno;
2271                 if (type != NULL)
2272                         *type = UPDATE_RECOVERY;
2273         }
2274
2275         RETURN(transno);
2276 }
2277
2278 /**
2279  * drop duplicate replay request
2280  *
2281  * Because the operation has been replayed by update recovery, the request
2282  * with the same transno will be dropped and also notify the client to send
2283  * next replay request.
2284  *
2285  * \param[in] env       execution environment
2286  * \param[in] obd       failover obd device
2287  * \param[in] req       request to be dropped
2288  */
2289 static void drop_duplicate_replay_req(struct lu_env *env,
2290                                       struct obd_device *obd,
2291                                       struct ptlrpc_request *req)
2292 {
2293         DEBUG_REQ(D_HA, req, "remove t%lld from %s because of duplicate"
2294                   " update records are found.\n",
2295                   lustre_msg_get_transno(req->rq_reqmsg),
2296                   libcfs_nid2str(req->rq_peer.nid));
2297
2298         /* Right now, only for MDS reint operation update replay and
2299          * normal request replay can have the same transno */
2300         if (lustre_msg_get_opc(req->rq_reqmsg) == MDS_REINT) {
2301                 req_capsule_set(&req->rq_pill, &RQF_MDS_REINT);
2302                 req->rq_status = req_capsule_server_pack(&req->rq_pill);
2303                 if (likely(req->rq_export))
2304                         target_committed_to_req(req);
2305                 lustre_msg_set_transno(req->rq_repmsg, req->rq_transno);
2306                 target_send_reply(req, req->rq_status, 0);
2307         } else {
2308                 DEBUG_REQ(D_ERROR, req, "wrong opc" "from %s\n",
2309                 libcfs_nid2str(req->rq_peer.nid));
2310         }
2311         target_exp_dequeue_req_replay(req);
2312         target_request_copy_put(req);
2313         obd->obd_replayed_requests++;
2314 }
2315
2316 static void replay_request_or_update(struct lu_env *env,
2317                                      struct lu_target *lut,
2318                                      struct target_recovery_data *trd,
2319                                      struct ptlrpc_thread *thread)
2320 {
2321         struct obd_device *obd = lut->lut_obd;
2322         struct ptlrpc_request *req = NULL;
2323         int                     type;
2324         __u64                   transno;
2325         ENTRY;
2326
2327         CDEBUG(D_HA, "Waiting for transno %lld\n",
2328                obd->obd_next_recovery_transno);
2329
2330         /* Replay all of request and update by transno */
2331         do {
2332                 struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
2333
2334                 CFS_FAIL_TIMEOUT(OBD_FAIL_TGT_REPLAY_DELAY2, cfs_fail_val);
2335
2336                 /** It is needed to extend recovery window above
2337                  *  recovery_time_soft. Extending is possible only in the
2338                  *  end of recovery window (see more details in
2339                  *  handle_recovery_req()).
2340                  */
2341                 CFS_FAIL_TIMEOUT_MS(OBD_FAIL_TGT_REPLAY_DELAY, 300);
2342
2343                 if (target_recovery_overseer(lut, check_for_next_transno,
2344                                         exp_req_replay_healthy_or_from_mdt)) {
2345                         abort_req_replay_queue(obd);
2346                         abort_lock_replay_queue(obd);
2347                         goto abort;
2348                 }
2349
2350                 spin_lock(&obd->obd_recovery_task_lock);
2351                 transno = get_next_transno(lut, &type);
2352                 if (type == REQUEST_RECOVERY && transno != 0) {
2353                         /* Drop replay request from client side, if the
2354                          * replay has been executed by update with the
2355                          * same transno */
2356                         req = list_entry(obd->obd_req_replay_queue.next,
2357                                         struct ptlrpc_request, rq_list);
2358
2359                         list_del_init(&req->rq_list);
2360                         obd->obd_requests_queued_for_recovery--;
2361                         spin_unlock(&obd->obd_recovery_task_lock);
2362
2363                         /* Let's check if the request has been redone by
2364                          * update replay */
2365                         if (is_req_replayed_by_update(req)) {
2366                                 struct distribute_txn_replay_req *dtrq;
2367
2368                                 dtrq = distribute_txn_lookup_finish_list(tdtd,
2369                                                                    req->rq_xid);
2370                                 LASSERT(dtrq != NULL);
2371                                 spin_lock(&tdtd->tdtd_replay_list_lock);
2372                                 list_del_init(&dtrq->dtrq_list);
2373                                 spin_unlock(&tdtd->tdtd_replay_list_lock);
2374                                 dtrq_destroy(dtrq);
2375
2376                                 drop_duplicate_replay_req(env, obd, req);
2377
2378                                 continue;
2379                         }
2380
2381                         LASSERT(trd->trd_processing_task == current_pid());
2382                         DEBUG_REQ(D_HA, req, "processing t%lld from %s",
2383                                   lustre_msg_get_transno(req->rq_reqmsg),
2384                                   libcfs_nid2str(req->rq_peer.nid));
2385
2386                         handle_recovery_req(thread, req,
2387                                             trd->trd_recovery_handler);
2388                         /**
2389                          * bz18031: increase next_recovery_transno before
2390                          * target_request_copy_put() will drop exp_rpc reference
2391                          */
2392                         spin_lock(&obd->obd_recovery_task_lock);
2393                         obd->obd_next_recovery_transno++;
2394                         spin_unlock(&obd->obd_recovery_task_lock);
2395                         target_exp_dequeue_req_replay(req);
2396                         target_request_copy_put(req);
2397                         obd->obd_replayed_requests++;
2398                 } else if (type == UPDATE_RECOVERY && transno != 0) {
2399                         struct distribute_txn_replay_req *dtrq;
2400                         int rc;
2401
2402                         spin_unlock(&obd->obd_recovery_task_lock);
2403
2404                         LASSERT(tdtd != NULL);
2405                         dtrq = distribute_txn_get_next_req(tdtd);
2406                         lu_context_enter(&thread->t_env->le_ctx);
2407                         rc = tdtd->tdtd_replay_handler(env, tdtd, dtrq);
2408                         lu_context_exit(&thread->t_env->le_ctx);
2409                         extend_recovery_timer(obd, obd_timeout, true);
2410
2411                         if (rc == 0 && dtrq->dtrq_xid != 0) {
2412                                 CDEBUG(D_HA, "Move x%llu t%llu"
2413                                        " to finish list\n", dtrq->dtrq_xid,
2414                                        dtrq->dtrq_master_transno);
2415
2416                                 /* Add it to the replay finish list */
2417                                 spin_lock(&tdtd->tdtd_replay_list_lock);
2418                                 list_add(&dtrq->dtrq_list,
2419                                          &tdtd->tdtd_replay_finish_list);
2420                                 spin_unlock(&tdtd->tdtd_replay_list_lock);
2421
2422                                 spin_lock(&obd->obd_recovery_task_lock);
2423                                 if (transno == obd->obd_next_recovery_transno)
2424                                         obd->obd_next_recovery_transno++;
2425                                 else if (transno >
2426                                          obd->obd_next_recovery_transno)
2427                                         obd->obd_next_recovery_transno =
2428                                                                 transno + 1;
2429                                 spin_unlock(&obd->obd_recovery_task_lock);
2430                         } else {
2431                                 dtrq_destroy(dtrq);
2432                         }
2433                 } else {
2434                         spin_unlock(&obd->obd_recovery_task_lock);
2435 abort:
2436                         LASSERT(list_empty(&obd->obd_req_replay_queue));
2437                         LASSERT(atomic_read(&obd->obd_req_replay_clients) == 0);
2438                         /** evict exports failed VBR */
2439                         class_disconnect_stale_exports(obd, exp_vbr_healthy);
2440                         break;
2441                 }
2442         } while (1);
2443 }
2444
2445 static int target_recovery_thread(void *arg)
2446 {
2447         struct lu_target *lut = arg;
2448         struct obd_device *obd = lut->lut_obd;
2449         struct ptlrpc_request *req;
2450         struct target_recovery_data *trd = &obd->obd_recovery_data;
2451         unsigned long delta;
2452         struct lu_env *env;
2453         struct ptlrpc_thread *thread = NULL;
2454         int rc = 0;
2455         ENTRY;
2456
2457         unshare_fs_struct();
2458         OBD_ALLOC_PTR(thread);
2459         if (thread == NULL)
2460                 RETURN(-ENOMEM);
2461
2462         OBD_ALLOC_PTR(env);
2463         if (env == NULL) {
2464                 OBD_FREE_PTR(thread);
2465                 RETURN(-ENOMEM);
2466         }
2467
2468         rc = lu_context_init(&env->le_ctx, LCT_MD_THREAD | LCT_DT_THREAD);
2469         if (rc) {
2470                 OBD_FREE_PTR(thread);
2471                 OBD_FREE_PTR(env);
2472                 RETURN(rc);
2473         }
2474
2475         thread->t_env = env;
2476         thread->t_id = -1; /* force filter_iobuf_get/put to use local buffers */
2477         env->le_ctx.lc_thread = thread;
2478         tgt_io_thread_init(thread); /* init thread_big_cache for IO requests */
2479         thread->t_watchdog = NULL;
2480
2481         CDEBUG(D_HA, "%s: started recovery thread pid %d\n", obd->obd_name,
2482                current_pid());
2483         trd->trd_processing_task = current_pid();
2484
2485         spin_lock(&obd->obd_dev_lock);
2486         obd->obd_recovering = 1;
2487         spin_unlock(&obd->obd_dev_lock);
2488         complete(&trd->trd_starting);
2489
2490         /* first of all, we have to know the first transno to replay */
2491         if (target_recovery_overseer(lut, check_for_recovery_ready,
2492                                      exp_connect_healthy)) {
2493                 abort_req_replay_queue(obd);
2494                 abort_lock_replay_queue(obd);
2495                 if (lut->lut_tdtd != NULL)
2496                         dtrq_list_destroy(lut->lut_tdtd);
2497         }
2498
2499         /* next stage: replay requests or update */
2500         delta = jiffies;
2501         CDEBUG(D_INFO, "1: request replay stage - %d clients from t%llu\n",
2502                atomic_read(&obd->obd_req_replay_clients),
2503                obd->obd_next_recovery_transno);
2504         replay_request_or_update(env, lut, trd, thread);
2505
2506         /**
2507          * The second stage: replay locks
2508          */
2509         CDEBUG(D_INFO, "2: lock replay stage - %d clients\n",
2510                atomic_read(&obd->obd_lock_replay_clients));
2511         while ((req = target_next_replay_lock(lut))) {
2512                 LASSERT(trd->trd_processing_task == current_pid());
2513                 DEBUG_REQ(D_HA, req, "processing lock from %s: ",
2514                           libcfs_nid2str(req->rq_peer.nid));
2515                 handle_recovery_req(thread, req,
2516                                     trd->trd_recovery_handler);
2517                 target_request_copy_put(req);
2518                 obd->obd_replayed_locks++;
2519         }
2520
2521         /**
2522          * The third stage: reply on final pings, at this moment all clients
2523          * must have request in final queue
2524          */
2525         CFS_FAIL_TIMEOUT(OBD_FAIL_TGT_REPLAY_RECONNECT, cfs_fail_val);
2526         CDEBUG(D_INFO, "3: final stage - process recovery completion pings\n");
2527         /** Update server last boot epoch */
2528         tgt_boot_epoch_update(lut);
2529         /* We drop recoverying flag to forward all new requests
2530          * to regular mds_handle() since now */
2531         spin_lock(&obd->obd_dev_lock);
2532         obd->obd_recovering = obd->obd_abort_recovery = 0;
2533         spin_unlock(&obd->obd_dev_lock);
2534         spin_lock(&obd->obd_recovery_task_lock);
2535         target_cancel_recovery_timer(obd);
2536         spin_unlock(&obd->obd_recovery_task_lock);
2537         while ((req = target_next_final_ping(obd))) {
2538                 LASSERT(trd->trd_processing_task == current_pid());
2539                 DEBUG_REQ(D_HA, req, "processing final ping from %s: ",
2540                           libcfs_nid2str(req->rq_peer.nid));
2541                 handle_recovery_req(thread, req,
2542                                     trd->trd_recovery_handler);
2543                 /* Because the waiting client can not send ping to server,
2544                  * so we need refresh the last_request_time, to avoid the
2545                  * export is being evicted */
2546                 ptlrpc_update_export_timer(req->rq_export, 0);
2547                 target_request_copy_put(req);
2548         }
2549
2550         delta = jiffies_to_msecs(jiffies - delta) / MSEC_PER_SEC;
2551         CDEBUG(D_INFO,"4: recovery completed in %lus - %d/%d reqs/locks\n",
2552               delta, obd->obd_replayed_requests, obd->obd_replayed_locks);
2553         if (delta > OBD_RECOVERY_TIME_SOFT) {
2554                 CWARN("too long recovery - read logs\n");
2555                 libcfs_debug_dumplog();
2556         }
2557
2558         target_finish_recovery(lut);
2559
2560         lu_context_fini(&env->le_ctx);
2561         trd->trd_processing_task = 0;
2562         complete(&trd->trd_finishing);
2563
2564         tgt_io_thread_done(thread);
2565         OBD_FREE_PTR(thread);
2566         OBD_FREE_PTR(env);
2567         RETURN(rc);
2568 }
2569
2570 static int target_start_recovery_thread(struct lu_target *lut,
2571                                         svc_handler_t handler)
2572 {
2573         struct obd_device *obd = lut->lut_obd;
2574         int rc = 0;
2575         struct target_recovery_data *trd = &obd->obd_recovery_data;
2576         int index;
2577
2578         memset(trd, 0, sizeof(*trd));
2579         init_completion(&trd->trd_starting);
2580         init_completion(&trd->trd_finishing);
2581         trd->trd_recovery_handler = handler;
2582
2583         rc = server_name2index(obd->obd_name, &index, NULL);
2584         if (rc < 0)
2585                 return rc;
2586
2587         if (!IS_ERR(kthread_run(target_recovery_thread,
2588                                 lut, "tgt_recover_%d", index))) {
2589                 wait_for_completion(&trd->trd_starting);
2590                 LASSERT(obd->obd_recovering != 0);
2591         } else {
2592                 rc = -ECHILD;
2593         }
2594
2595         return rc;
2596 }
2597
2598 void target_stop_recovery_thread(struct obd_device *obd)
2599 {
2600         if (obd->obd_recovery_data.trd_processing_task > 0) {
2601                 struct target_recovery_data *trd = &obd->obd_recovery_data;
2602                 /** recovery can be done but postrecovery is not yet */
2603                 spin_lock(&obd->obd_dev_lock);
2604                 if (obd->obd_recovering) {
2605                         CERROR("%s: Aborting recovery\n", obd->obd_name);
2606                         obd->obd_abort_recovery = 1;
2607                         wake_up(&obd->obd_next_transno_waitq);
2608                 }
2609                 spin_unlock(&obd->obd_dev_lock);
2610                 wait_for_completion(&trd->trd_finishing);
2611         }
2612 }
2613 EXPORT_SYMBOL(target_stop_recovery_thread);
2614
2615 void target_recovery_fini(struct obd_device *obd)
2616 {
2617         class_disconnect_exports(obd);
2618         target_stop_recovery_thread(obd);
2619         target_cleanup_recovery(obd);
2620 }
2621 EXPORT_SYMBOL(target_recovery_fini);
2622
2623 static void target_recovery_expired(cfs_timer_cb_arg_t data)
2624 {
2625         struct obd_device *obd = cfs_from_timer(obd, data, obd_recovery_timer);
2626         CDEBUG(D_HA, "%s: recovery timed out; %d clients are still in recovery"
2627                " after %llus (%d clients connected)\n",
2628                obd->obd_name, atomic_read(&obd->obd_lock_replay_clients),
2629                (s64)(ktime_get_real_seconds() - obd->obd_recovery_start),
2630                atomic_read(&obd->obd_connected_clients));
2631
2632         obd->obd_recovery_expired = 1;
2633         wake_up(&obd->obd_next_transno_waitq);
2634 }
2635
2636 void target_recovery_init(struct lu_target *lut, svc_handler_t handler)
2637 {
2638         struct obd_device *obd = lut->lut_obd;
2639
2640         if (lut->lut_bottom->dd_rdonly)
2641                 return;
2642
2643         if (obd->obd_max_recoverable_clients == 0) {
2644                 /** Update server last boot epoch */
2645                 tgt_boot_epoch_update(lut);
2646                 return;
2647         }
2648
2649         CDEBUG(D_HA, "RECOVERY: service %s, %d recoverable clients, "
2650                "last_transno %llu\n", obd->obd_name,
2651                obd->obd_max_recoverable_clients, obd->obd_last_committed);
2652         LASSERT(obd->obd_stopping == 0);
2653         obd->obd_next_recovery_transno = obd->obd_last_committed + 1;
2654         obd->obd_recovery_start = 0;
2655         obd->obd_recovery_end = 0;
2656
2657         cfs_timer_setup(&obd->obd_recovery_timer, target_recovery_expired,
2658                         (unsigned long)obd, 0);
2659         target_start_recovery_thread(lut, handler);
2660 }
2661 EXPORT_SYMBOL(target_recovery_init);
2662
2663 static int target_process_req_flags(struct obd_device *obd,
2664                                     struct ptlrpc_request *req)
2665 {
2666         struct obd_export *exp = req->rq_export;
2667         LASSERT(exp != NULL);
2668         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
2669                 /* client declares he's ready to replay locks */
2670                 spin_lock(&exp->exp_lock);
2671                 if (exp->exp_req_replay_needed) {
2672                         exp->exp_req_replay_needed = 0;
2673                         spin_unlock(&exp->exp_lock);
2674
2675                         LASSERT_ATOMIC_POS(&obd->obd_req_replay_clients);
2676                         atomic_dec(&obd->obd_req_replay_clients);
2677                 } else {
2678                         spin_unlock(&exp->exp_lock);
2679                 }
2680         }
2681         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
2682                 /* client declares he's ready to complete recovery
2683                  * so, we put the request on th final queue */
2684                 spin_lock(&exp->exp_lock);
2685                 if (exp->exp_lock_replay_needed) {
2686                         exp->exp_lock_replay_needed = 0;
2687                         spin_unlock(&exp->exp_lock);
2688
2689                         LASSERT_ATOMIC_POS(&obd->obd_lock_replay_clients);
2690                         atomic_dec(&obd->obd_lock_replay_clients);
2691                 } else {
2692                         spin_unlock(&exp->exp_lock);
2693                 }
2694         }
2695         return 0;
2696 }
2697
2698 int target_queue_recovery_request(struct ptlrpc_request *req,
2699                                   struct obd_device *obd)
2700 {
2701         __u64 transno = lustre_msg_get_transno(req->rq_reqmsg);
2702         struct ptlrpc_request *reqiter;
2703         int inserted = 0;
2704         ENTRY;
2705
2706         if (obd->obd_recovery_data.trd_processing_task == current_pid()) {
2707                 /* Processing the queue right now, don't re-add. */
2708                 RETURN(1);
2709         }
2710
2711         target_process_req_flags(obd, req);
2712
2713         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
2714                 if (unlikely(OBD_FAIL_CHECK(OBD_FAIL_TGT_RECOVERY_REQ_RACE))) {
2715                         if (cfs_fail_val == 1) {
2716                                 cfs_race_state = 1;
2717                                 cfs_fail_val = 0;
2718                                 wake_up(&cfs_race_waitq);
2719
2720                                 set_current_state(TASK_INTERRUPTIBLE);
2721                                 schedule_timeout(cfs_time_seconds(1));
2722                         }
2723                 }
2724
2725                 /* client declares he's ready to complete recovery
2726                  * so, we put the request on th final queue */
2727                 target_request_copy_get(req);
2728                 DEBUG_REQ(D_HA, req, "queue final req");
2729                 wake_up(&obd->obd_next_transno_waitq);
2730                 spin_lock(&obd->obd_recovery_task_lock);
2731                 if (obd->obd_recovering) {
2732                         struct ptlrpc_request *tmp;
2733                         struct ptlrpc_request *duplicate = NULL;
2734
2735                         if (likely(!req->rq_export->exp_replay_done)) {
2736                                 req->rq_export->exp_replay_done = 1;
2737                                 list_add_tail(&req->rq_list,
2738                                               &obd->obd_final_req_queue);
2739                                 spin_unlock(&obd->obd_recovery_task_lock);
2740                                 RETURN(0);
2741                         }
2742
2743                         /* XXX O(n), but only happens if final ping is
2744                          * timed out, probably reorganize the list as
2745                          * a hash list later */
2746                         list_for_each_entry_safe(reqiter, tmp,
2747                                                  &obd->obd_final_req_queue,
2748                                                  rq_list) {
2749                                 if (reqiter->rq_export == req->rq_export) {
2750                                         list_del_init(&reqiter->rq_list);
2751                                         duplicate = reqiter;
2752                                         break;
2753                                 }
2754                         }
2755
2756                         list_add_tail(&req->rq_list,
2757                                       &obd->obd_final_req_queue);
2758                         req->rq_export->exp_replay_done = 1;
2759                         spin_unlock(&obd->obd_recovery_task_lock);
2760
2761                         if (duplicate != NULL) {
2762                                 DEBUG_REQ(D_HA, duplicate,
2763                                           "put prev final req\n");
2764                                 target_request_copy_put(duplicate);
2765                         }
2766                         RETURN(0);
2767                 } else {
2768                         spin_unlock(&obd->obd_recovery_task_lock);
2769                         target_request_copy_put(req);
2770                         RETURN(obd->obd_stopping ? -ENOTCONN : 1);
2771                 }
2772         }
2773         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
2774                 /* client declares he's ready to replay locks */
2775                 target_request_copy_get(req);
2776                 DEBUG_REQ(D_HA, req, "queue lock replay req");
2777                 wake_up(&obd->obd_next_transno_waitq);
2778                 spin_lock(&obd->obd_recovery_task_lock);
2779                 LASSERT(obd->obd_recovering);
2780                 /* usually due to recovery abort */
2781                 if (!req->rq_export->exp_in_recovery) {
2782                         spin_unlock(&obd->obd_recovery_task_lock);
2783                         target_request_copy_put(req);
2784                         RETURN(-ENOTCONN);
2785                 }
2786                 LASSERT(req->rq_export->exp_lock_replay_needed);
2787                 list_add_tail(&req->rq_list, &obd->obd_lock_replay_queue);
2788                 spin_unlock(&obd->obd_recovery_task_lock);
2789                 RETURN(0);
2790         }
2791
2792         /* CAVEAT EMPTOR: The incoming request message has been swabbed
2793          * (i.e. buflens etc are in my own byte order), but type-dependent
2794          * buffers (eg mdt_body, ost_body etc) have NOT been swabbed. */
2795
2796         if (!transno) {
2797                 INIT_LIST_HEAD(&req->rq_list);
2798                 DEBUG_REQ(D_HA, req, "not queueing");
2799                 RETURN(1);
2800         }
2801
2802         /* If we're processing the queue, we want don't want to queue this
2803          * message.
2804          *
2805          * Also, if this request has a transno less than the one we're waiting
2806          * for, we should process it now.  It could (and currently always will)
2807          * be an open request for a descriptor that was opened some time ago.
2808          *
2809          * Also, a resent, replayed request that has already been
2810          * handled will pass through here and be processed immediately.
2811          */
2812         CDEBUG(D_HA, "Next recovery transno: %llu"
2813                ", current: %llu, replaying\n",
2814                obd->obd_next_recovery_transno, transno);
2815
2816         /* If the request has been replayed by update replay, then sends this
2817          * request to the recovery thread (replay_request_or_update()), where
2818          * it will be handled */
2819         spin_lock(&obd->obd_recovery_task_lock);
2820         if (transno < obd->obd_next_recovery_transno &&
2821             !is_req_replayed_by_update(req)) {
2822                 /* Processing the queue right now, don't re-add. */
2823                 LASSERT(list_empty(&req->rq_list));
2824                 spin_unlock(&obd->obd_recovery_task_lock);
2825                 RETURN(1);
2826         }
2827         spin_unlock(&obd->obd_recovery_task_lock);
2828
2829         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_REPLAY_DROP))
2830                 RETURN(0);
2831
2832         target_request_copy_get(req);
2833         if (!req->rq_export->exp_in_recovery) {
2834                 target_request_copy_put(req);
2835                 RETURN(-ENOTCONN);
2836         }
2837         LASSERT(req->rq_export->exp_req_replay_needed);
2838
2839         if (target_exp_enqueue_req_replay(req)) {
2840                 DEBUG_REQ(D_ERROR, req, "dropping resent queued req");
2841                 target_request_copy_put(req);
2842                 RETURN(0);
2843         }
2844
2845         /* XXX O(n^2) */
2846         spin_lock(&obd->obd_recovery_task_lock);
2847         LASSERT(obd->obd_recovering);
2848         list_for_each_entry(reqiter, &obd->obd_req_replay_queue, rq_list) {
2849                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) > transno) {
2850                         list_add_tail(&req->rq_list, &reqiter->rq_list);
2851                         inserted = 1;
2852                         goto added;
2853                 }
2854
2855                 if (unlikely(lustre_msg_get_transno(reqiter->rq_reqmsg) ==
2856                              transno)) {
2857                         DEBUG_REQ(D_ERROR, req, "dropping replay: transno "
2858                                   "has been claimed by another client");
2859                         spin_unlock(&obd->obd_recovery_task_lock);
2860                         target_exp_dequeue_req_replay(req);
2861                         target_request_copy_put(req);
2862                         RETURN(0);
2863                 }
2864         }
2865 added:
2866         if (!inserted)
2867                 list_add_tail(&req->rq_list, &obd->obd_req_replay_queue);
2868
2869         obd->obd_requests_queued_for_recovery++;
2870         spin_unlock(&obd->obd_recovery_task_lock);
2871         wake_up(&obd->obd_next_transno_waitq);
2872         RETURN(0);
2873 }
2874
2875 int target_handle_ping(struct ptlrpc_request *req)
2876 {
2877         obd_ping(req->rq_svc_thread->t_env, req->rq_export);
2878         return req_capsule_server_pack(&req->rq_pill);
2879 }
2880
2881 void target_committed_to_req(struct ptlrpc_request *req)
2882 {
2883         struct obd_export *exp = req->rq_export;
2884
2885         if (!exp->exp_obd->obd_no_transno && req->rq_repmsg != NULL)
2886                 lustre_msg_set_last_committed(req->rq_repmsg,
2887                                               exp->exp_last_committed);
2888         else
2889                 DEBUG_REQ(D_IOCTL, req, "not sending last_committed update (%d/"
2890                           "%d)", exp->exp_obd->obd_no_transno,
2891                           req->rq_repmsg == NULL);
2892
2893         CDEBUG(D_INFO, "last_committed %llu, transno %llu, xid %llu\n",
2894                exp->exp_last_committed, req->rq_transno, req->rq_xid);
2895 }
2896
2897 #endif /* HAVE_SERVER_SUPPORT */
2898
2899 /**
2900  * Packs current SLV and Limit into \a req.
2901  */
2902 int target_pack_pool_reply(struct ptlrpc_request *req)
2903 {
2904         struct obd_device *obd;
2905         ENTRY;
2906
2907         /* Check that we still have all structures alive as this may
2908          * be some late RPC at shutdown time. */
2909         if (unlikely(!req->rq_export || !req->rq_export->exp_obd ||
2910                      !exp_connect_lru_resize(req->rq_export))) {
2911                 lustre_msg_set_slv(req->rq_repmsg, 0);
2912                 lustre_msg_set_limit(req->rq_repmsg, 0);
2913                 RETURN(0);
2914         }
2915
2916         /* OBD is alive here as export is alive, which we checked above. */
2917         obd = req->rq_export->exp_obd;
2918
2919         read_lock(&obd->obd_pool_lock);
2920         lustre_msg_set_slv(req->rq_repmsg, obd->obd_pool_slv);
2921         lustre_msg_set_limit(req->rq_repmsg, obd->obd_pool_limit);
2922         read_unlock(&obd->obd_pool_lock);
2923
2924         RETURN(0);
2925 }
2926
2927 static int target_send_reply_msg(struct ptlrpc_request *req,
2928                                  int rc, int fail_id)
2929 {
2930         if (OBD_FAIL_CHECK_ORSET(fail_id & ~OBD_FAIL_ONCE, OBD_FAIL_ONCE)) {
2931                 DEBUG_REQ(D_ERROR, req, "dropping reply");
2932                 return -ECOMM;
2933         }
2934         /* We can have a null rq_reqmsg in the event of bad signature or
2935          * no context when unwrapping */
2936         if (req->rq_reqmsg &&
2937             unlikely(lustre_msg_get_opc(req->rq_reqmsg) == MDS_REINT &&
2938             OBD_FAIL_CHECK(OBD_FAIL_MDS_REINT_MULTI_NET_REP)))
2939                 return -ECOMM;
2940
2941         if (unlikely(rc)) {
2942                 DEBUG_REQ(D_NET, req, "processing error (%d)", rc);
2943                 req->rq_status = rc;
2944                 return ptlrpc_send_error(req, 1);
2945         } else {
2946                 DEBUG_REQ(D_NET, req, "sending reply");
2947         }
2948
2949         return ptlrpc_send_reply(req, PTLRPC_REPLY_MAYBE_DIFFICULT);
2950 }
2951
2952 void target_send_reply(struct ptlrpc_request *req, int rc, int fail_id)
2953 {
2954         struct ptlrpc_service_part *svcpt;
2955         int                        netrc;
2956         struct ptlrpc_reply_state *rs;
2957         struct obd_export         *exp;
2958         ENTRY;
2959
2960         if (req->rq_no_reply) {
2961                 EXIT;
2962                 return;
2963         }
2964
2965         svcpt = req->rq_rqbd->rqbd_svcpt;
2966         rs = req->rq_reply_state;
2967         if (rs == NULL || !rs->rs_difficult) {
2968                 /* no notifiers */
2969                 target_send_reply_msg (req, rc, fail_id);
2970                 EXIT;
2971                 return;
2972         }
2973
2974         /* must be an export if locks saved */
2975         LASSERT(req->rq_export != NULL);
2976         /* req/reply consistent */
2977         LASSERT(rs->rs_svcpt == svcpt);
2978
2979         /* "fresh" reply */
2980         LASSERT(!rs->rs_scheduled);
2981         LASSERT(!rs->rs_scheduled_ever);
2982         LASSERT(!rs->rs_handled);
2983         LASSERT(!rs->rs_on_net);
2984         LASSERT(rs->rs_export == NULL);
2985         LASSERT(list_empty(&rs->rs_obd_list));
2986         LASSERT(list_empty(&rs->rs_exp_list));
2987
2988         exp = class_export_get(req->rq_export);
2989
2990         /* disable reply scheduling while I'm setting up */
2991         rs->rs_scheduled = 1;
2992         rs->rs_on_net    = 1;
2993         rs->rs_xid       = req->rq_xid;
2994         rs->rs_transno   = req->rq_transno;
2995         rs->rs_export    = exp;
2996         rs->rs_opc       = lustre_msg_get_opc(req->rq_reqmsg);
2997
2998         spin_lock(&exp->exp_uncommitted_replies_lock);
2999         CDEBUG(D_NET, "rs transno = %llu, last committed = %llu\n",
3000                rs->rs_transno, exp->exp_last_committed);
3001         if (rs->rs_transno > exp->exp_last_committed) {
3002                 /* not committed already */
3003                 list_add_tail(&rs->rs_obd_list,
3004                                   &exp->exp_uncommitted_replies);
3005         }
3006         spin_unlock(&exp->exp_uncommitted_replies_lock);
3007
3008         spin_lock(&exp->exp_lock);
3009         list_add_tail(&rs->rs_exp_list, &exp->exp_outstanding_replies);
3010         spin_unlock(&exp->exp_lock);
3011
3012         netrc = target_send_reply_msg(req, rc, fail_id);
3013
3014         spin_lock(&svcpt->scp_rep_lock);
3015
3016         atomic_inc(&svcpt->scp_nreps_difficult);
3017
3018         if (netrc != 0) {
3019                 /* error sending: reply is off the net.  Also we need +1
3020                  * reply ref until ptlrpc_handle_rs() is done
3021                  * with the reply state (if the send was successful, there
3022                  * would have been +1 ref for the net, which
3023                  * reply_out_callback leaves alone) */
3024                 rs->rs_on_net = 0;
3025                 ptlrpc_rs_addref(rs);
3026         }
3027
3028         spin_lock(&rs->rs_lock);
3029         if (rs->rs_transno <= exp->exp_last_committed ||
3030             (!rs->rs_on_net && !rs->rs_no_ack) ||
3031             list_empty(&rs->rs_exp_list) ||     /* completed already */
3032             list_empty(&rs->rs_obd_list)) {
3033                 CDEBUG(D_HA, "Schedule reply immediately\n");
3034                 ptlrpc_dispatch_difficult_reply(rs);
3035         } else {
3036                 list_add(&rs->rs_list, &svcpt->scp_rep_active);
3037                 rs->rs_scheduled = 0;   /* allow notifier to schedule */
3038         }
3039         spin_unlock(&rs->rs_lock);
3040         spin_unlock(&svcpt->scp_rep_lock);
3041         EXIT;
3042 }
3043
3044 enum ldlm_mode lck_compat_array[] = {
3045         [LCK_EX]    = LCK_COMPAT_EX,
3046         [LCK_PW]    = LCK_COMPAT_PW,
3047         [LCK_PR]    = LCK_COMPAT_PR,
3048         [LCK_CW]    = LCK_COMPAT_CW,
3049         [LCK_CR]    = LCK_COMPAT_CR,
3050         [LCK_NL]    = LCK_COMPAT_NL,
3051         [LCK_GROUP] = LCK_COMPAT_GROUP,
3052         [LCK_COS]   = LCK_COMPAT_COS,
3053 };
3054
3055 /**
3056  * Rather arbitrary mapping from LDLM error codes to errno values. This should
3057  * not escape to the user level.
3058  */
3059 int ldlm_error2errno(enum ldlm_error error)
3060 {
3061         int result;
3062
3063         switch (error) {
3064         case ELDLM_OK:
3065         case ELDLM_LOCK_MATCHED:
3066                 result = 0;
3067                 break;
3068         case ELDLM_LOCK_CHANGED:
3069                 result = -ESTALE;
3070                 break;
3071         case ELDLM_LOCK_ABORTED:
3072                 result = -ENAVAIL;
3073                 break;
3074         case ELDLM_LOCK_REPLACED:
3075                 result = -ESRCH;
3076                 break;
3077         case ELDLM_NO_LOCK_DATA:
3078                 result = -ENOENT;
3079                 break;
3080         case ELDLM_NAMESPACE_EXISTS:
3081                 result = -EEXIST;
3082                 break;
3083         case ELDLM_BAD_NAMESPACE:
3084                 result = -EBADF;
3085                 break;
3086         default:
3087                 if (((int)error) < 0) { /* cast to signed type */
3088                         result = error; /* as ldlm_error can be unsigned */
3089                 } else {
3090                         CERROR("Invalid DLM result code: %d\n", error);
3091                         result = -EPROTO;
3092                 }
3093         }
3094         return result;
3095 }
3096 EXPORT_SYMBOL(ldlm_error2errno);
3097
3098 /**
3099  * Dual to ldlm_error2errno(): maps errno values back to enum ldlm_error.
3100  */
3101 enum ldlm_error ldlm_errno2error(int err_no)
3102 {
3103         int error;
3104
3105         switch (err_no) {
3106         case 0:
3107                 error = ELDLM_OK;
3108                 break;
3109         case -ESTALE:
3110                 error = ELDLM_LOCK_CHANGED;
3111                 break;
3112         case -ENAVAIL:
3113                 error = ELDLM_LOCK_ABORTED;
3114                 break;
3115         case -ESRCH:
3116                 error = ELDLM_LOCK_REPLACED;
3117                 break;
3118         case -ENOENT:
3119                 error = ELDLM_NO_LOCK_DATA;
3120                 break;
3121         case -EEXIST:
3122                 error = ELDLM_NAMESPACE_EXISTS;
3123                 break;
3124         case -EBADF:
3125                 error = ELDLM_BAD_NAMESPACE;
3126                 break;
3127         default:
3128                 error = err_no;
3129         }
3130         return error;
3131 }
3132
3133 #if LUSTRE_TRACKS_LOCK_EXP_REFS
3134 void ldlm_dump_export_locks(struct obd_export *exp)
3135 {
3136         spin_lock(&exp->exp_locks_list_guard);
3137         if (!list_empty(&exp->exp_locks_list)) {
3138                 struct ldlm_lock *lock;
3139
3140                 CERROR("dumping locks for export %p,"
3141                        "ignore if the unmount doesn't hang\n", exp);
3142                 list_for_each_entry(lock, &exp->exp_locks_list,
3143                                         l_exp_refs_link)
3144                         LDLM_ERROR(lock, "lock:");
3145         }
3146         spin_unlock(&exp->exp_locks_list_guard);
3147 }
3148 #endif
3149
3150 #ifdef HAVE_SERVER_SUPPORT
3151 static int target_bulk_timeout(void *data)
3152 {
3153         ENTRY;
3154         /* We don't fail the connection here, because having the export
3155          * killed makes the (vital) call to commitrw very sad.
3156          */
3157         RETURN(1);
3158 }
3159
3160 static inline const char *bulk2type(struct ptlrpc_request *req)
3161 {
3162         if (req->rq_bulk_read)
3163                 return "READ";
3164         if (req->rq_bulk_write)
3165                 return "WRITE";
3166         return "UNKNOWN";
3167 }
3168
3169 int target_bulk_io(struct obd_export *exp, struct ptlrpc_bulk_desc *desc,
3170                    struct l_wait_info *lwi)