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LU-6179 llite: Implement ladvise lockahead
[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, 2016, 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/kthread.h>
43 #include <libcfs/libcfs.h>
44 #include <obd.h>
45 #include <obd_class.h>
46 #include <lustre_dlm.h>
47 #include <lustre_net.h>
48 #include <lustre_sec.h>
49 #include "ldlm_internal.h"
50
51 /* @priority: If non-zero, move the selected connection to the list head.
52  * @create: If zero, only search in existing connections.
53  */
54 static int import_set_conn(struct obd_import *imp, struct obd_uuid *uuid,
55                            int priority, int create)
56 {
57         struct ptlrpc_connection *ptlrpc_conn;
58         struct obd_import_conn *imp_conn = NULL, *item;
59         lnet_nid_t nid4refnet = LNET_NID_ANY;
60         int rc = 0;
61         ENTRY;
62
63         if (!create && !priority) {
64                 CDEBUG(D_HA, "Nothing to do\n");
65                 RETURN(-EINVAL);
66         }
67
68         if (imp->imp_connection &&
69             imp->imp_connection->c_remote_uuid.uuid[0] == 0)
70                 /* nid4refnet is used to restrict network connections */
71                 nid4refnet = imp->imp_connection->c_self;
72         ptlrpc_conn = ptlrpc_uuid_to_connection(uuid, nid4refnet);
73         if (!ptlrpc_conn) {
74                 CDEBUG(D_HA, "can't find connection %s\n", uuid->uuid);
75                 RETURN(-ENOENT);
76         }
77
78         if (create) {
79                 OBD_ALLOC(imp_conn, sizeof(*imp_conn));
80                 if (!imp_conn)
81                         GOTO(out_put, rc = -ENOMEM);
82         }
83
84         spin_lock(&imp->imp_lock);
85         list_for_each_entry(item, &imp->imp_conn_list, oic_item) {
86                 if (obd_uuid_equals(uuid, &item->oic_uuid)) {
87                         if (priority) {
88                                 list_del(&item->oic_item);
89                                 list_add(&item->oic_item,
90                                          &imp->imp_conn_list);
91                                 item->oic_last_attempt = 0;
92                         }
93                         CDEBUG(D_HA, "imp %p@%s: found existing conn %s%s\n",
94                                imp, imp->imp_obd->obd_name, uuid->uuid,
95                                (priority ? ", moved to head" : ""));
96                         spin_unlock(&imp->imp_lock);
97                         GOTO(out_free, rc = 0);
98                 }
99         }
100         /* No existing import connection found for \a uuid. */
101         if (create) {
102                 imp_conn->oic_conn = ptlrpc_conn;
103                 imp_conn->oic_uuid = *uuid;
104                 imp_conn->oic_last_attempt = 0;
105                 if (priority)
106                         list_add(&imp_conn->oic_item, &imp->imp_conn_list);
107                 else
108                         list_add_tail(&imp_conn->oic_item,
109                                       &imp->imp_conn_list);
110                 CDEBUG(D_HA, "imp %p@%s: add connection %s at %s\n",
111                        imp, imp->imp_obd->obd_name, uuid->uuid,
112                        (priority ? "head" : "tail"));
113         } else {
114                 spin_unlock(&imp->imp_lock);
115                 GOTO(out_free, rc = -ENOENT);
116         }
117
118         spin_unlock(&imp->imp_lock);
119         RETURN(0);
120 out_free:
121         if (imp_conn)
122                 OBD_FREE(imp_conn, sizeof(*imp_conn));
123 out_put:
124         ptlrpc_connection_put(ptlrpc_conn);
125         RETURN(rc);
126 }
127
128 int import_set_conn_priority(struct obd_import *imp, struct obd_uuid *uuid)
129 {
130         return import_set_conn(imp, uuid, 1, 0);
131 }
132
133 int client_import_add_conn(struct obd_import *imp, struct obd_uuid *uuid,
134                            int priority)
135 {
136         return import_set_conn(imp, uuid, priority, 1);
137 }
138 EXPORT_SYMBOL(client_import_add_conn);
139
140 int client_import_del_conn(struct obd_import *imp, struct obd_uuid *uuid)
141 {
142         struct obd_import_conn *imp_conn;
143         struct obd_export *dlmexp;
144         int rc = -ENOENT;
145         ENTRY;
146
147         spin_lock(&imp->imp_lock);
148         if (list_empty(&imp->imp_conn_list)) {
149                 LASSERT(!imp->imp_connection);
150                 GOTO(out, rc);
151         }
152
153         list_for_each_entry(imp_conn, &imp->imp_conn_list, oic_item) {
154                 if (!obd_uuid_equals(uuid, &imp_conn->oic_uuid))
155                         continue;
156                 LASSERT(imp_conn->oic_conn);
157
158                 if (imp_conn == imp->imp_conn_current) {
159                         LASSERT(imp_conn->oic_conn == imp->imp_connection);
160
161                         if (imp->imp_state != LUSTRE_IMP_CLOSED &&
162                             imp->imp_state != LUSTRE_IMP_DISCON) {
163                                 CERROR("can't remove current connection\n");
164                                 GOTO(out, rc = -EBUSY);
165                         }
166
167                         ptlrpc_connection_put(imp->imp_connection);
168                         imp->imp_connection = NULL;
169
170                         dlmexp = class_conn2export(&imp->imp_dlm_handle);
171                         if (dlmexp && dlmexp->exp_connection) {
172                                 LASSERT(dlmexp->exp_connection ==
173                                         imp_conn->oic_conn);
174                                 ptlrpc_connection_put(dlmexp->exp_connection);
175                                 dlmexp->exp_connection = NULL;
176                         }
177
178                         if (dlmexp != NULL)
179                                 class_export_put(dlmexp);
180                 }
181
182                 list_del(&imp_conn->oic_item);
183                 ptlrpc_connection_put(imp_conn->oic_conn);
184                 OBD_FREE(imp_conn, sizeof(*imp_conn));
185                 CDEBUG(D_HA, "imp %p@%s: remove connection %s\n",
186                        imp, imp->imp_obd->obd_name, uuid->uuid);
187                 rc = 0;
188                 break;
189         }
190 out:
191         spin_unlock(&imp->imp_lock);
192         if (rc == -ENOENT)
193                 CERROR("connection %s not found\n", uuid->uuid);
194         RETURN(rc);
195 }
196 EXPORT_SYMBOL(client_import_del_conn);
197
198 /**
199  * Find conn UUID by peer NID. \a peer is a server NID. This function is used
200  * to find a conn uuid of \a imp which can reach \a peer.
201  */
202 int client_import_find_conn(struct obd_import *imp, lnet_nid_t peer,
203                             struct obd_uuid *uuid)
204 {
205         struct obd_import_conn *conn;
206         int rc = -ENOENT;
207         ENTRY;
208
209         spin_lock(&imp->imp_lock);
210         list_for_each_entry(conn, &imp->imp_conn_list, oic_item) {
211                 /* Check if conn UUID does have this peer NID. */
212                 if (class_check_uuid(&conn->oic_uuid, peer)) {
213                         *uuid = conn->oic_uuid;
214                         rc = 0;
215                         break;
216                 }
217         }
218         spin_unlock(&imp->imp_lock);
219         RETURN(rc);
220 }
221 EXPORT_SYMBOL(client_import_find_conn);
222
223 void client_destroy_import(struct obd_import *imp)
224 {
225         /* Drop security policy instance after all RPCs have finished/aborted
226          * to let all busy contexts be released. */
227         class_import_get(imp);
228         class_destroy_import(imp);
229         sptlrpc_import_sec_put(imp);
230         class_import_put(imp);
231 }
232 EXPORT_SYMBOL(client_destroy_import);
233
234 /**
235  * Check whether or not the OSC is on MDT.
236  * In the config log,
237  * osc on MDT
238  *      setup 0:{fsname}-OSTxxxx-osc[-MDTxxxx] 1:lustre-OST0000_UUID 2:NID
239  * osc on client
240  *      setup 0:{fsname}-OSTxxxx-osc 1:lustre-OST0000_UUID 2:NID
241  *
242  **/
243 static int osc_on_mdt(char *obdname)
244 {
245         char *ptr;
246
247         ptr = strrchr(obdname, '-');
248         if (ptr == NULL)
249                 return 0;
250
251         if (strncmp(ptr + 1, "MDT", 3) == 0)
252                 return 1;
253
254         return 0;
255 }
256
257 /* Configure an RPC client OBD device.
258  *
259  * lcfg parameters:
260  * 1 - client UUID
261  * 2 - server UUID
262  * 3 - inactive-on-startup
263  * 4 - restrictive net
264  */
265 int client_obd_setup(struct obd_device *obddev, struct lustre_cfg *lcfg)
266 {
267         struct client_obd *cli = &obddev->u.cli;
268         struct obd_import *imp;
269         struct obd_uuid server_uuid;
270         int rq_portal, rp_portal, connect_op;
271         char *name = obddev->obd_type->typ_name;
272         enum ldlm_ns_type ns_type = LDLM_NS_TYPE_UNKNOWN;
273         char *cli_name = lustre_cfg_buf(lcfg, 0);
274         struct ptlrpc_connection fake_conn = { .c_self = 0,
275                                                .c_remote_uuid.uuid[0] = 0 };
276         int rc;
277         ENTRY;
278
279         /* In a more perfect world, we would hang a ptlrpc_client off of
280          * obd_type and just use the values from there. */
281         if (!strcmp(name, LUSTRE_OSC_NAME)) {
282                 rq_portal = OST_REQUEST_PORTAL;
283                 rp_portal = OSC_REPLY_PORTAL;
284                 connect_op = OST_CONNECT;
285                 cli->cl_sp_me = LUSTRE_SP_CLI;
286                 cli->cl_sp_to = LUSTRE_SP_OST;
287                 ns_type = LDLM_NS_TYPE_OSC;
288         } else if (!strcmp(name, LUSTRE_MDC_NAME) ||
289                    !strcmp(name, LUSTRE_LWP_NAME)) {
290                 rq_portal = MDS_REQUEST_PORTAL;
291                 rp_portal = MDC_REPLY_PORTAL;
292                 connect_op = MDS_CONNECT;
293                 if (is_lwp_on_ost(cli_name))
294                         cli->cl_sp_me = LUSTRE_SP_OST;
295                 else if (is_lwp_on_mdt(cli_name))
296                         cli->cl_sp_me = LUSTRE_SP_MDT;
297                 else
298                         cli->cl_sp_me = LUSTRE_SP_CLI;
299                 cli->cl_sp_to = LUSTRE_SP_MDT;
300                 ns_type = LDLM_NS_TYPE_MDC;
301         } else if (!strcmp(name, LUSTRE_OSP_NAME)) {
302                 if (strstr(lustre_cfg_buf(lcfg, 1), "OST") == NULL) {
303                         /* OSP_on_MDT for other MDTs */
304                         connect_op = MDS_CONNECT;
305                         cli->cl_sp_to = LUSTRE_SP_MDT;
306                         ns_type = LDLM_NS_TYPE_MDC;
307                         rq_portal = OUT_PORTAL;
308                 } else {
309                         /* OSP on MDT for OST */
310                         connect_op = OST_CONNECT;
311                         cli->cl_sp_to = LUSTRE_SP_OST;
312                         ns_type = LDLM_NS_TYPE_OSC;
313                         rq_portal = OST_REQUEST_PORTAL;
314                 }
315                 rp_portal = OSC_REPLY_PORTAL;
316                 cli->cl_sp_me = LUSTRE_SP_MDT;
317         } else if (!strcmp(name, LUSTRE_MGC_NAME)) {
318                 rq_portal = MGS_REQUEST_PORTAL;
319                 rp_portal = MGC_REPLY_PORTAL;
320                 connect_op = MGS_CONNECT;
321                 cli->cl_sp_me = LUSTRE_SP_MGC;
322                 cli->cl_sp_to = LUSTRE_SP_MGS;
323                 cli->cl_flvr_mgc.sf_rpc = SPTLRPC_FLVR_INVALID;
324                 ns_type = LDLM_NS_TYPE_MGC;
325         } else {
326                 CERROR("unknown client OBD type \"%s\", can't setup\n",
327                        name);
328                 RETURN(-EINVAL);
329         }
330
331         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
332                 CERROR("requires a TARGET UUID\n");
333                 RETURN(-EINVAL);
334         }
335
336         if (LUSTRE_CFG_BUFLEN(lcfg, 1) > 37) {
337                 CERROR("client UUID must be less than 38 characters\n");
338                 RETURN(-EINVAL);
339         }
340
341         if (LUSTRE_CFG_BUFLEN(lcfg, 2) < 1) {
342                 CERROR("setup requires a SERVER UUID\n");
343                 RETURN(-EINVAL);
344         }
345
346         if (LUSTRE_CFG_BUFLEN(lcfg, 2) > 37) {
347                 CERROR("target UUID must be less than 38 characters\n");
348                 RETURN(-EINVAL);
349         }
350
351         init_rwsem(&cli->cl_sem);
352         mutex_init(&cli->cl_mgc_mutex);
353         cli->cl_seq = NULL;
354         init_rwsem(&cli->cl_seq_rwsem);
355         cli->cl_conn_count = 0;
356         memcpy(server_uuid.uuid, lustre_cfg_buf(lcfg, 2),
357                min_t(unsigned int, LUSTRE_CFG_BUFLEN(lcfg, 2),
358                      sizeof(server_uuid)));
359
360         cli->cl_dirty_pages = 0;
361         cli->cl_avail_grant = 0;
362         /* FIXME: Should limit this for the sum of all cl_dirty_max_pages. */
363         /* cl_dirty_max_pages may be changed at connect time in
364          * ptlrpc_connect_interpret(). */
365         client_adjust_max_dirty(cli);
366         INIT_LIST_HEAD(&cli->cl_cache_waiters);
367         INIT_LIST_HEAD(&cli->cl_loi_ready_list);
368         INIT_LIST_HEAD(&cli->cl_loi_hp_ready_list);
369         INIT_LIST_HEAD(&cli->cl_loi_write_list);
370         INIT_LIST_HEAD(&cli->cl_loi_read_list);
371         spin_lock_init(&cli->cl_loi_list_lock);
372         atomic_set(&cli->cl_pending_w_pages, 0);
373         atomic_set(&cli->cl_pending_r_pages, 0);
374         cli->cl_r_in_flight = 0;
375         cli->cl_w_in_flight = 0;
376
377         spin_lock_init(&cli->cl_read_rpc_hist.oh_lock);
378         spin_lock_init(&cli->cl_write_rpc_hist.oh_lock);
379         spin_lock_init(&cli->cl_read_page_hist.oh_lock);
380         spin_lock_init(&cli->cl_write_page_hist.oh_lock);
381         spin_lock_init(&cli->cl_read_offset_hist.oh_lock);
382         spin_lock_init(&cli->cl_write_offset_hist.oh_lock);
383
384         /* lru for osc. */
385         INIT_LIST_HEAD(&cli->cl_lru_osc);
386         atomic_set(&cli->cl_lru_shrinkers, 0);
387         atomic_long_set(&cli->cl_lru_busy, 0);
388         atomic_long_set(&cli->cl_lru_in_list, 0);
389         INIT_LIST_HEAD(&cli->cl_lru_list);
390         spin_lock_init(&cli->cl_lru_list_lock);
391         atomic_long_set(&cli->cl_unstable_count, 0);
392         INIT_LIST_HEAD(&cli->cl_shrink_list);
393
394         init_waitqueue_head(&cli->cl_destroy_waitq);
395         atomic_set(&cli->cl_destroy_in_flight, 0);
396 #ifdef ENABLE_CHECKSUM
397         /* Turn on checksumming by default. */
398         cli->cl_checksum = 1;
399         /*
400          * The supported checksum types will be worked out at connect time
401          * Set cl_chksum* to CRC32 for now to avoid returning screwed info
402          * through procfs.
403          */
404         cli->cl_cksum_type = cli->cl_supp_cksum_types = OBD_CKSUM_CRC32;
405 #endif
406         atomic_set(&cli->cl_resends, OSC_DEFAULT_RESENDS);
407
408         /* Set it to possible maximum size. It may be reduced by ocd_brw_size
409          * from OFD after connecting. */
410         cli->cl_max_pages_per_rpc = PTLRPC_MAX_BRW_PAGES;
411
412         /* set cl_chunkbits default value to PAGE_SHIFT,
413          * it will be updated at OSC connection time. */
414         cli->cl_chunkbits = PAGE_SHIFT;
415
416         if (!strcmp(name, LUSTRE_MDC_NAME)) {
417                 cli->cl_max_rpcs_in_flight = OBD_MAX_RIF_DEFAULT;
418         } else if (totalram_pages >> (20 - PAGE_SHIFT) <= 128 /* MB */) {
419                 cli->cl_max_rpcs_in_flight = 2;
420         } else if (totalram_pages >> (20 - PAGE_SHIFT) <= 256 /* MB */) {
421                 cli->cl_max_rpcs_in_flight = 3;
422         } else if (totalram_pages >> (20 - PAGE_SHIFT) <= 512 /* MB */) {
423                 cli->cl_max_rpcs_in_flight = 4;
424         } else {
425                 if (osc_on_mdt(obddev->obd_name))
426                         cli->cl_max_rpcs_in_flight = OBD_MAX_RIF_MAX;
427                 else
428                         cli->cl_max_rpcs_in_flight = OBD_MAX_RIF_DEFAULT;
429         }
430
431         spin_lock_init(&cli->cl_mod_rpcs_lock);
432         spin_lock_init(&cli->cl_mod_rpcs_hist.oh_lock);
433         cli->cl_max_mod_rpcs_in_flight = 0;
434         cli->cl_mod_rpcs_in_flight = 0;
435         cli->cl_close_rpcs_in_flight = 0;
436         init_waitqueue_head(&cli->cl_mod_rpcs_waitq);
437         cli->cl_mod_tag_bitmap = NULL;
438
439         INIT_LIST_HEAD(&cli->cl_chg_dev_linkage);
440
441         if (connect_op == MDS_CONNECT) {
442                 cli->cl_max_mod_rpcs_in_flight = cli->cl_max_rpcs_in_flight - 1;
443                 OBD_ALLOC(cli->cl_mod_tag_bitmap,
444                           BITS_TO_LONGS(OBD_MAX_RIF_MAX) * sizeof(long));
445                 if (cli->cl_mod_tag_bitmap == NULL)
446                         GOTO(err, rc = -ENOMEM);
447         }
448
449         rc = ldlm_get_ref();
450         if (rc) {
451                 CERROR("ldlm_get_ref failed: %d\n", rc);
452                 GOTO(err, rc);
453         }
454
455         ptlrpc_init_client(rq_portal, rp_portal, name,
456                            &obddev->obd_ldlm_client);
457
458         imp = class_new_import(obddev);
459         if (imp == NULL)
460                 GOTO(err_ldlm, rc = -ENOENT);
461         imp->imp_client = &obddev->obd_ldlm_client;
462         imp->imp_connect_op = connect_op;
463         memcpy(cli->cl_target_uuid.uuid, lustre_cfg_buf(lcfg, 1),
464                LUSTRE_CFG_BUFLEN(lcfg, 1));
465         class_import_put(imp);
466
467         if (lustre_cfg_buf(lcfg, 4)) {
468                 __u32 refnet = libcfs_str2net(lustre_cfg_string(lcfg, 4));
469
470                 if (refnet == LNET_NIDNET(LNET_NID_ANY)) {
471                         rc = -EINVAL;
472                         CERROR("%s: bad mount option 'network=%s': rc = %d\n",
473                                obddev->obd_name, lustre_cfg_string(lcfg, 4),
474                                rc);
475                         GOTO(err_import, rc);
476                 }
477                 fake_conn.c_self = LNET_MKNID(refnet, 0);
478                 imp->imp_connection = &fake_conn;
479         }
480
481         rc = client_import_add_conn(imp, &server_uuid, 1);
482         if (rc) {
483                 CERROR("can't add initial connection\n");
484                 GOTO(err_import, rc);
485         }
486         imp->imp_connection = NULL;
487
488         cli->cl_import = imp;
489         /* cli->cl_max_mds_easize updated by mdc_init_ea_size() */
490         cli->cl_max_mds_easize = sizeof(struct lov_mds_md_v3);
491
492         if (LUSTRE_CFG_BUFLEN(lcfg, 3) > 0) {
493                 if (!strcmp(lustre_cfg_string(lcfg, 3), "inactive")) {
494                         CDEBUG(D_HA, "marking %s %s->%s as inactive\n",
495                                name, obddev->obd_name,
496                                cli->cl_target_uuid.uuid);
497                         spin_lock(&imp->imp_lock);
498                         imp->imp_deactive = 1;
499                         spin_unlock(&imp->imp_lock);
500                 }
501         }
502
503         obddev->obd_namespace = ldlm_namespace_new(obddev, obddev->obd_name,
504                                                    LDLM_NAMESPACE_CLIENT,
505                                                    LDLM_NAMESPACE_GREEDY,
506                                                    ns_type);
507         if (obddev->obd_namespace == NULL) {
508                 CERROR("Unable to create client namespace - %s\n",
509                        obddev->obd_name);
510                 GOTO(err_import, rc = -ENOMEM);
511         }
512
513         RETURN(rc);
514
515 err_import:
516         class_destroy_import(imp);
517 err_ldlm:
518         ldlm_put_ref();
519 err:
520         if (cli->cl_mod_tag_bitmap != NULL)
521                 OBD_FREE(cli->cl_mod_tag_bitmap,
522                          BITS_TO_LONGS(OBD_MAX_RIF_MAX) * sizeof(long));
523         cli->cl_mod_tag_bitmap = NULL;
524         RETURN(rc);
525
526 }
527 EXPORT_SYMBOL(client_obd_setup);
528
529 int client_obd_cleanup(struct obd_device *obddev)
530 {
531         struct client_obd *cli = &obddev->u.cli;
532         ENTRY;
533
534         ldlm_namespace_free_post(obddev->obd_namespace);
535         obddev->obd_namespace = NULL;
536
537         obd_cleanup_client_import(obddev);
538         LASSERT(obddev->u.cli.cl_import == NULL);
539
540         ldlm_put_ref();
541
542         if (cli->cl_mod_tag_bitmap != NULL)
543                 OBD_FREE(cli->cl_mod_tag_bitmap,
544                          BITS_TO_LONGS(OBD_MAX_RIF_MAX) * sizeof(long));
545         cli->cl_mod_tag_bitmap = NULL;
546
547         RETURN(0);
548 }
549 EXPORT_SYMBOL(client_obd_cleanup);
550
551 /* ->o_connect() method for client side (OSC and MDC and MGC) */
552 int client_connect_import(const struct lu_env *env,
553                           struct obd_export **exp,
554                           struct obd_device *obd, struct obd_uuid *cluuid,
555                           struct obd_connect_data *data, void *localdata)
556 {
557         struct client_obd       *cli    = &obd->u.cli;
558         struct obd_import       *imp    = cli->cl_import;
559         struct obd_connect_data *ocd;
560         struct lustre_handle    conn    = { 0 };
561         int                     rc;
562         ENTRY;
563
564         *exp = NULL;
565         down_write(&cli->cl_sem);
566         if (cli->cl_conn_count > 0)
567                 GOTO(out_sem, rc = -EALREADY);
568
569         rc = class_connect(&conn, obd, cluuid);
570         if (rc)
571                 GOTO(out_sem, rc);
572
573         cli->cl_conn_count++;
574         *exp = class_conn2export(&conn);
575
576         LASSERT(obd->obd_namespace);
577
578         imp->imp_dlm_handle = conn;
579         rc = ptlrpc_init_import(imp);
580         if (rc != 0)
581                 GOTO(out_ldlm, rc);
582
583         ocd = &imp->imp_connect_data;
584         if (data) {
585                 *ocd = *data;
586                 imp->imp_connect_flags_orig = data->ocd_connect_flags;
587                 imp->imp_connect_flags2_orig = data->ocd_connect_flags2;
588         }
589
590         rc = ptlrpc_connect_import(imp);
591         if (rc != 0) {
592                 LASSERT(imp->imp_state == LUSTRE_IMP_DISCON);
593                 GOTO(out_ldlm, rc);
594         }
595         LASSERT(*exp != NULL && (*exp)->exp_connection);
596
597         if (data) {
598                 LASSERTF((ocd->ocd_connect_flags & data->ocd_connect_flags) ==
599                          ocd->ocd_connect_flags, "old %#llx, new %#llx\n",
600                          data->ocd_connect_flags, ocd->ocd_connect_flags);
601                 data->ocd_connect_flags = ocd->ocd_connect_flags;
602                 data->ocd_connect_flags2 = ocd->ocd_connect_flags2;
603         }
604
605         ptlrpc_pinger_add_import(imp);
606
607         EXIT;
608
609         if (rc) {
610 out_ldlm:
611                 cli->cl_conn_count--;
612                 class_disconnect(*exp);
613                 *exp = NULL;
614         }
615 out_sem:
616         up_write(&cli->cl_sem);
617
618         return rc;
619 }
620 EXPORT_SYMBOL(client_connect_import);
621
622 int client_disconnect_export(struct obd_export *exp)
623 {
624         struct obd_device *obd = class_exp2obd(exp);
625         struct client_obd *cli;
626         struct obd_import *imp;
627         int rc = 0, err;
628         ENTRY;
629
630         if (!obd) {
631                 CERROR("invalid export for disconnect: exp %p cookie %#llx\n",
632                        exp, exp ? exp->exp_handle.h_cookie : -1);
633                 RETURN(-EINVAL);
634         }
635
636         cli = &obd->u.cli;
637         imp = cli->cl_import;
638
639         down_write(&cli->cl_sem);
640         CDEBUG(D_INFO, "disconnect %s - %zu\n", obd->obd_name,
641                 cli->cl_conn_count);
642
643         if (cli->cl_conn_count == 0) {
644                 CERROR("disconnecting disconnected device (%s)\n",
645                        obd->obd_name);
646                 GOTO(out_disconnect, rc = -EINVAL);
647         }
648
649         cli->cl_conn_count--;
650         if (cli->cl_conn_count != 0)
651                 GOTO(out_disconnect, rc = 0);
652
653         /* Mark import deactivated now, so we don't try to reconnect if any
654          * of the cleanup RPCs fails (e.g. LDLM cancel, etc).  We don't
655          * fully deactivate the import, or that would drop all requests. */
656         spin_lock(&imp->imp_lock);
657         imp->imp_deactive = 1;
658         spin_unlock(&imp->imp_lock);
659
660         /* Some non-replayable imports (MDS's OSCs) are pinged, so just
661          * delete it regardless.  (It's safe to delete an import that was
662          * never added.) */
663         (void)ptlrpc_pinger_del_import(imp);
664
665         if (obd->obd_namespace != NULL) {
666                 /* obd_force == local only */
667                 ldlm_cli_cancel_unused(obd->obd_namespace, NULL,
668                                        obd->obd_force ? LCF_LOCAL : 0, NULL);
669                 ldlm_namespace_free_prior(obd->obd_namespace, imp, obd->obd_force);
670         }
671
672         /* There's no need to hold sem while disconnecting an import,
673          * and it may actually cause deadlock in GSS. */
674         up_write(&cli->cl_sem);
675         rc = ptlrpc_disconnect_import(imp, 0);
676         down_write(&cli->cl_sem);
677
678         ptlrpc_invalidate_import(imp);
679
680         EXIT;
681
682 out_disconnect:
683         /* Use server style - class_disconnect should be always called for
684          * o_disconnect. */
685         err = class_disconnect(exp);
686         if (!rc && err)
687                 rc = err;
688
689         up_write(&cli->cl_sem);
690
691         RETURN(rc);
692 }
693 EXPORT_SYMBOL(client_disconnect_export);
694
695 #ifdef HAVE_SERVER_SUPPORT
696 int server_disconnect_export(struct obd_export *exp)
697 {
698         int rc;
699         ENTRY;
700
701         /* Disconnect early so that clients can't keep using export. */
702         rc = class_disconnect(exp);
703         /* Close import to avoid sending any requests. */
704         if (exp->exp_imp_reverse)
705                 ptlrpc_cleanup_imp(exp->exp_imp_reverse);
706
707         ldlm_bl_thread_wakeup();
708
709         /* complete all outstanding replies */
710         spin_lock(&exp->exp_lock);
711         while (!list_empty(&exp->exp_outstanding_replies)) {
712                 struct ptlrpc_reply_state *rs =
713                         list_entry(exp->exp_outstanding_replies.next,
714                                        struct ptlrpc_reply_state, rs_exp_list);
715                 struct ptlrpc_service_part *svcpt = rs->rs_svcpt;
716
717                 spin_lock(&svcpt->scp_rep_lock);
718
719                 list_del_init(&rs->rs_exp_list);
720
721                 spin_lock(&rs->rs_lock);
722                 /* clear rs_convert_lock to make sure rs is handled and put */
723                 rs->rs_convert_lock = 0;
724                 ptlrpc_schedule_difficult_reply(rs);
725                 spin_unlock(&rs->rs_lock);
726
727                 spin_unlock(&svcpt->scp_rep_lock);
728         }
729         spin_unlock(&exp->exp_lock);
730
731         RETURN(rc);
732 }
733 EXPORT_SYMBOL(server_disconnect_export);
734
735 /* --------------------------------------------------------------------------
736  * from old lib/target.c
737  * -------------------------------------------------------------------------- */
738
739 static int target_handle_reconnect(struct lustre_handle *conn,
740                                    struct obd_export *exp,
741                                    struct obd_uuid *cluuid)
742 {
743         struct obd_device *target;
744         struct lustre_handle *hdl;
745         cfs_time_t now;
746         cfs_time_t deadline;
747         int timeout;
748         int rc = 0;
749         ENTRY;
750
751         hdl = &exp->exp_imp_reverse->imp_remote_handle;
752         if (!exp->exp_connection || !lustre_handle_is_used(hdl)) {
753                 conn->cookie = exp->exp_handle.h_cookie;
754                 CDEBUG(D_HA, "connect export for UUID '%s' at %p,"
755                        " cookie %#llx\n", cluuid->uuid, exp, conn->cookie);
756                 RETURN(0);
757         }
758
759         target = exp->exp_obd;
760
761         /* Might be a re-connect after a partition. */
762         if (memcmp(&conn->cookie, &hdl->cookie, sizeof conn->cookie)) {
763                 LCONSOLE_WARN("%s: already connected client %s (at %s) "
764                               "with handle %#llx. Rejecting client "
765                               "with the same UUID trying to reconnect "
766                               "with handle %#llx\n", target->obd_name,
767                               obd_uuid2str(&exp->exp_client_uuid),
768                               obd_export_nid2str(exp),
769                               hdl->cookie, conn->cookie);
770                 memset(conn, 0, sizeof *conn);
771                 /* target_handle_connect() treats EALREADY and
772                  * -EALREADY differently.  -EALREADY is an error
773                  * (same UUID, different handle). */
774                 RETURN(-EALREADY);
775         }
776
777         if (!target->obd_recovering) {
778                 LCONSOLE_WARN("%s: Client %s (at %s) reconnecting\n",
779                         target->obd_name, obd_uuid2str(&exp->exp_client_uuid),
780                         obd_export_nid2str(exp));
781                 GOTO(out_already, rc);
782         }
783
784         now = cfs_time_current();
785         deadline = target->obd_recovery_timer.expires;
786         if (cfs_time_before(now, deadline)) {
787                 struct target_distribute_txn_data *tdtd =
788                                         class_exp2tgt(exp)->lut_tdtd;
789                 int size = 0;
790                 int count = 0;
791                 char *buf = NULL;
792
793                 timeout = cfs_duration_sec(cfs_time_sub(deadline, now));
794                 if (tdtd && tdtd->tdtd_show_update_logs_retrievers)
795                         buf = tdtd->tdtd_show_update_logs_retrievers(
796                                 tdtd->tdtd_show_retrievers_cbdata,
797                                 &size, &count);
798
799                 if (count > 0)
800                         LCONSOLE_WARN("%s: Recovery already passed deadline "
801                                       "%d:%.02d. It is due to DNE recovery "
802                                       "failed/stuck on the %d MDT(s):%s. "
803                                       "Please wait until all MDTs recovered "
804                                       "or abort the recovery by force.\n",
805                                       target->obd_name, timeout / 60,
806                                       timeout % 60, count,
807                                       buf ? buf : "unknown (not enough RAM)");
808                 else
809                         LCONSOLE_WARN("%s: Recovery already passed deadline "
810                                       "%d:%.02d. If you do not want to wait "
811                                       "more, please abort the recovery by "
812                                       "force.\n", target->obd_name,
813                                       timeout / 60, timeout % 60);
814
815                 if (buf != NULL)
816                         OBD_FREE(buf, size);
817         } else {
818                 timeout = cfs_duration_sec(cfs_time_sub(now, deadline));
819                 LCONSOLE_WARN("%s: Recovery already passed deadline"
820                         " %d:%.02d, It is most likely due to DNE"
821                         " recovery is failed or stuck, please wait a"
822                         " few more minutes or abort the recovery.\n",
823                         target->obd_name, timeout / 60, timeout % 60);
824         }
825
826 out_already:
827         conn->cookie = exp->exp_handle.h_cookie;
828         /* target_handle_connect() treats EALREADY and
829          * -EALREADY differently.  EALREADY means we are
830          * doing a valid reconnect from the same client. */
831         RETURN(EALREADY);
832 }
833
834 static void
835 check_and_start_recovery_timer(struct obd_device *obd,
836                                struct ptlrpc_request *req, int new_client);
837
838 /**
839  * update flags for import during reconnect process
840  */
841 static int rev_import_flags_update(struct obd_import *revimp,
842                                    struct ptlrpc_request *req)
843 {
844         int rc;
845         struct obd_connect_data *data;
846
847         data = req_capsule_client_get(&req->rq_pill, &RMF_CONNECT_DATA);
848
849         if (data->ocd_connect_flags & OBD_CONNECT_AT)
850                 revimp->imp_msghdr_flags |= MSGHDR_AT_SUPPORT;
851         else
852                 revimp->imp_msghdr_flags &= ~MSGHDR_AT_SUPPORT;
853
854         revimp->imp_msghdr_flags |= MSGHDR_CKSUM_INCOMPAT18;
855
856         rc = sptlrpc_import_sec_adapt(revimp, req->rq_svc_ctx, &req->rq_flvr);
857         if (rc) {
858                 CERROR("%s: cannot get reverse import %s security: rc = %d\n",
859                         revimp->imp_client->cli_name,
860                         libcfs_id2str(req->rq_peer), rc);
861                 return rc;
862         }
863
864         return 0;
865 }
866
867 /**
868  * Allocate a new reverse import for an export.
869  *
870  * \retval -errno in case error hit
871  * \retval 0 if reverse import correctly init
872  **/
873 int rev_import_init(struct obd_export *export)
874 {
875         struct obd_device *obd = export->exp_obd;
876         struct obd_import *revimp;
877
878         LASSERT(export->exp_imp_reverse == NULL);
879
880         revimp = class_new_import(obd);
881         if (revimp == NULL)
882                 return -ENOMEM;
883
884         revimp->imp_remote_handle.cookie = 0ULL;
885         revimp->imp_client = &obd->obd_ldlm_client;
886         revimp->imp_dlm_fake = 1;
887
888         /* it is safe to connect import in new state as no sends possible */
889         spin_lock(&export->exp_lock);
890         export->exp_imp_reverse = revimp;
891         spin_unlock(&export->exp_lock);
892         class_import_put(revimp);
893
894         return 0;
895 }
896 EXPORT_SYMBOL(rev_import_init);
897
898 /**
899  * Handle reconnect for an export.
900  *
901  * \param exp export to handle reconnect process
902  * \param req client reconnect request
903  *
904  * \retval -rc in case securitfy flavor can't be changed
905  * \retval 0 in case none problems
906  */
907 static int rev_import_reconnect(struct obd_export *exp,
908                                 struct ptlrpc_request *req)
909 {
910         struct obd_import *revimp = exp->exp_imp_reverse;
911         struct lustre_handle *lh;
912         int rc;
913
914         /* avoid sending a request until import flags are changed */
915         ptlrpc_import_enter_resend(revimp);
916
917         if (revimp->imp_connection != NULL)
918                 ptlrpc_connection_put(revimp->imp_connection);
919
920         /*
921          * client from recovery don't have a handle so we need to take from
922          * request. it may produce situation when wrong client connected
923          * to recovery as we trust a client uuid
924          */
925         lh = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
926         revimp->imp_remote_handle = *lh;
927
928         /* unknown versions will be caught in
929          * ptlrpc_handle_server_req_in->lustre_unpack_msg() */
930         revimp->imp_msg_magic = req->rq_reqmsg->lm_magic;
931
932         revimp->imp_connection = ptlrpc_connection_addref(exp->exp_connection);
933
934         rc = rev_import_flags_update(revimp, req);
935         if (rc != 0) {
936                 /* it is safe to still be in RECOVERY phase as we are not able
937                  * to setup correct security flavor so requests are not able to
938                  * be delivered correctly */
939                 return rc;
940         }
941
942         /* resend all rpc's via new connection */
943         return ptlrpc_import_recovery_state_machine(revimp);
944 }
945
946 int target_handle_connect(struct ptlrpc_request *req)
947 {
948         struct obd_device *target = NULL;
949         struct obd_export *export = NULL;
950         /* connect handle - filled from target_handle_reconnect in
951          * reconnect case */
952         struct lustre_handle conn;
953         struct lustre_handle *tmp;
954         struct obd_uuid tgtuuid;
955         struct obd_uuid cluuid;
956         char *str;
957         int rc = 0;
958         char *target_start;
959         int target_len;
960         bool     mds_conn = false, lw_client = false, initial_conn = false;
961         bool     mds_mds_conn = false;
962         bool     new_mds_mds_conn = false;
963         bool     target_referenced = false;
964         struct obd_connect_data *data, *tmpdata;
965         int size, tmpsize;
966         lnet_nid_t *client_nid = NULL;
967         ENTRY;
968
969         OBD_RACE(OBD_FAIL_TGT_CONN_RACE);
970
971         str = req_capsule_client_get(&req->rq_pill, &RMF_TGTUUID);
972         if (str == NULL) {
973                 DEBUG_REQ(D_ERROR, req, "bad target UUID for connect");
974                 GOTO(out, rc = -EINVAL);
975         }
976
977         obd_str2uuid(&tgtuuid, str);
978         target = class_uuid2obd(&tgtuuid);
979         if (!target)
980                 target = class_name2obd(str);
981
982         if (!target) {
983                 deuuidify(str, NULL, &target_start, &target_len);
984                 LCONSOLE_ERROR_MSG(0x137, "%s: not available for connect "
985                                    "from %s (no target). If you are running "
986                                    "an HA pair check that the target is "
987                                    "mounted on the other server.\n", str,
988                                    libcfs_nid2str(req->rq_peer.nid));
989                 GOTO(out, rc = -ENODEV);
990         }
991
992         spin_lock(&target->obd_dev_lock);
993         if (target->obd_stopping || !target->obd_set_up) {
994                 spin_unlock(&target->obd_dev_lock);
995
996                 deuuidify(str, NULL, &target_start, &target_len);
997                 LCONSOLE_INFO("%.*s: Not available for connect from %s (%s)\n",
998                               target_len, target_start,
999                               libcfs_nid2str(req->rq_peer.nid),
1000                               (target->obd_stopping ?
1001                                "stopping" : "not set up"));
1002                 GOTO(out, rc = -ENODEV);
1003         }
1004
1005         if (target->obd_no_conn) {
1006                 spin_unlock(&target->obd_dev_lock);
1007
1008                 CDEBUG(D_INFO, "%s: Temporarily refusing client connection "
1009                                "from %s\n", target->obd_name,
1010                                libcfs_nid2str(req->rq_peer.nid));
1011                 GOTO(out, rc = -EAGAIN);
1012         }
1013
1014         /* Make sure the target isn't cleaned up while we're here. Yes,
1015          * there's still a race between the above check and our incref here.
1016          * Really, class_uuid2obd should take the ref. */
1017         class_incref(target, __func__, current);
1018         target_referenced = true;
1019
1020         target->obd_conn_inprogress++;
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 #endif
1060
1061         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
1062                 if (data->ocd_version < LUSTRE_VERSION_CODE -
1063                                                LUSTRE_VERSION_ALLOWED_OFFSET ||
1064                     data->ocd_version > LUSTRE_VERSION_CODE +
1065                                                LUSTRE_VERSION_ALLOWED_OFFSET) {
1066                         DEBUG_REQ(D_WARNING, req, "Refusing %s (%d.%d.%d.%d) "
1067                                   "libclient connection attempt",
1068                                   data->ocd_version < LUSTRE_VERSION_CODE ?
1069                                   "old" : "new",
1070                                   OBD_OCD_VERSION_MAJOR(data->ocd_version),
1071                                   OBD_OCD_VERSION_MINOR(data->ocd_version),
1072                                   OBD_OCD_VERSION_PATCH(data->ocd_version),
1073                                   OBD_OCD_VERSION_FIX(data->ocd_version));
1074                         data = req_capsule_server_sized_get(&req->rq_pill,
1075                                                             &RMF_CONNECT_DATA,
1076                                     offsetof(typeof(*data), ocd_version) +
1077                                              sizeof(data->ocd_version));
1078                         if (data) {
1079                                 data->ocd_connect_flags = OBD_CONNECT_VERSION;
1080                                 data->ocd_version = LUSTRE_VERSION_CODE;
1081                         }
1082                         GOTO(out, rc = -EPROTO);
1083                 }
1084         }
1085
1086         /* Note: lw_client is needed in MDS-MDS failover during update log
1087          * processing, so we needs to allow lw_client to be connected at
1088          * anytime, instead of only the initial connection */
1089         lw_client = (data->ocd_connect_flags & OBD_CONNECT_LIGHTWEIGHT) != 0;
1090
1091         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_INITIAL) {
1092                 initial_conn = true;
1093                 mds_conn = (data->ocd_connect_flags & OBD_CONNECT_MDS) != 0;
1094                 mds_mds_conn = (data->ocd_connect_flags &
1095                                 OBD_CONNECT_MDS_MDS) != 0;
1096
1097                 /* OBD_CONNECT_MNE_SWAB is defined as OBD_CONNECT_MDS_MDS
1098                  * for Imperative Recovery connection from MGC to MGS.
1099                  *
1100                  * Via check OBD_CONNECT_FID, we can distinguish whether
1101                  * the OBD_CONNECT_MDS_MDS/OBD_CONNECT_MNE_SWAB is from
1102                  * MGC or MDT. */
1103                 if (!lw_client &&
1104                     (data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) &&
1105                     (data->ocd_connect_flags & OBD_CONNECT_FID) &&
1106                     (data->ocd_connect_flags & OBD_CONNECT_VERSION)) {
1107                         __u32 major = OBD_OCD_VERSION_MAJOR(data->ocd_version);
1108                         __u32 minor = OBD_OCD_VERSION_MINOR(data->ocd_version);
1109                         __u32 patch = OBD_OCD_VERSION_PATCH(data->ocd_version);
1110
1111                         /* We do not support the MDT-MDT interoperations with
1112                          * different version MDT because of protocol changes. */
1113                         if (unlikely(major != LUSTRE_MAJOR ||
1114                                      minor != LUSTRE_MINOR ||
1115                                      abs(patch - LUSTRE_PATCH) > 3)) {
1116                                 LCONSOLE_WARN("%s (%u.%u.%u.%u) refused the "
1117                                         "connection from different version MDT "
1118                                         "(%d.%d.%d.%d) %s %s\n",
1119                                         target->obd_name, LUSTRE_MAJOR,
1120                                         LUSTRE_MINOR, LUSTRE_PATCH, LUSTRE_FIX,
1121                                         major, minor, patch,
1122                                         OBD_OCD_VERSION_FIX(data->ocd_version),
1123                                         libcfs_nid2str(req->rq_peer.nid), str);
1124
1125                                 GOTO(out, rc = -EPROTO);
1126                         }
1127                 }
1128         }
1129
1130         /* lctl gets a backstage, all-access pass. */
1131         if (obd_uuid_equals(&cluuid, &target->obd_uuid))
1132                 goto dont_check_exports;
1133
1134         export = cfs_hash_lookup(target->obd_uuid_hash, &cluuid);
1135         if (!export)
1136                 goto no_export;
1137
1138         /* We've found an export in the hash. */
1139
1140         spin_lock(&export->exp_lock);
1141
1142         if (export->exp_connecting) { /* bug 9635, et. al. */
1143                 spin_unlock(&export->exp_lock);
1144                 LCONSOLE_WARN("%s: Export %p already connecting from %s\n",
1145                               export->exp_obd->obd_name, export,
1146                               libcfs_nid2str(req->rq_peer.nid));
1147                 class_export_put(export);
1148                 export = NULL;
1149                 rc = -EALREADY;
1150         } else if ((mds_conn || (lw_client && initial_conn) ||
1151                    data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) &&
1152                    export->exp_connection != NULL) {
1153                 spin_unlock(&export->exp_lock);
1154                 if (req->rq_peer.nid != export->exp_connection->c_peer.nid) {
1155                         /* MDS or LWP reconnected after failover. */
1156                         LCONSOLE_WARN("%s: Received %s connection from "
1157                             "%s, removing former export from %s\n",
1158                             target->obd_name, mds_conn ? "MDS" : "LWP",
1159                             libcfs_nid2str(req->rq_peer.nid),
1160                             libcfs_nid2str(export->exp_connection->c_peer.nid));
1161                 } else {
1162                         /* New MDS connection from the same NID. */
1163                         LCONSOLE_WARN("%s: Received new %s connection from "
1164                                 "%s, removing former export from same NID\n",
1165                                 target->obd_name, mds_conn ? "MDS" : "LWP",
1166                                 libcfs_nid2str(req->rq_peer.nid));
1167                 }
1168
1169                 if (req->rq_peer.nid == export->exp_connection->c_peer.nid &&
1170                     data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) {
1171                         /* Because exports between MDTs will always be
1172                          * kept, let's do not fail such export if they
1173                          * come from the same NID, otherwise it might
1174                          * cause eviction between MDTs, which might
1175                          * cause namespace inconsistency */
1176                         spin_lock(&export->exp_lock);
1177                         export->exp_connecting = 1;
1178                         spin_unlock(&export->exp_lock);
1179                         conn.cookie = export->exp_handle.h_cookie;
1180                         rc = EALREADY;
1181                 } else {
1182                         class_fail_export(export);
1183                         class_export_put(export);
1184                         export = NULL;
1185                         rc = 0;
1186                 }
1187         } else if (export->exp_connection != NULL && initial_conn &&
1188                    req->rq_peer.nid != export->exp_connection->c_peer.nid) {
1189                 spin_unlock(&export->exp_lock);
1190                 /* In MDS failover we have static UUID but NID can change. */
1191                 LCONSOLE_WARN("%s: Client %s seen on new nid %s when "
1192                               "existing nid %s is already connected\n",
1193                               target->obd_name, cluuid.uuid,
1194                               libcfs_nid2str(req->rq_peer.nid),
1195                               libcfs_nid2str(
1196                                       export->exp_connection->c_peer.nid));
1197                 rc = -EALREADY;
1198                 class_export_put(export);
1199                 export = NULL;
1200         } else {
1201                 export->exp_connecting = 1;
1202                 spin_unlock(&export->exp_lock);
1203                 LASSERT(export->exp_obd == target);
1204
1205                 rc = target_handle_reconnect(&conn, export, &cluuid);
1206         }
1207
1208         /* If we found an export, we already unlocked. */
1209         if (!export) {
1210 no_export:
1211                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_CONNECT, 2 * obd_timeout);
1212         } else if (req->rq_export == NULL &&
1213                    atomic_read(&export->exp_rpc_count) > 0) {
1214                 LCONSOLE_WARN("%s: Client %s (at %s) refused connection, "
1215                               "still busy with %d references\n",
1216                               target->obd_name, cluuid.uuid,
1217                               libcfs_nid2str(req->rq_peer.nid),
1218                               atomic_read(&export->exp_refcount));
1219                 GOTO(out, rc = -EBUSY);
1220         } else if (lustre_msg_get_conn_cnt(req->rq_reqmsg) == 1) {
1221                 if (!strstr(cluuid.uuid, "mdt"))
1222                         LCONSOLE_WARN("%s: Rejecting reconnect from the "
1223                                       "known client %s (at %s) because it "
1224                                       "is indicating it is a new client",
1225                                       target->obd_name, cluuid.uuid,
1226                                       libcfs_nid2str(req->rq_peer.nid));
1227                 GOTO(out, rc = -EALREADY);
1228         } else {
1229                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_RECONNECT, 2 * obd_timeout);
1230         }
1231
1232         if (rc < 0) {
1233                 GOTO(out, rc);
1234         }
1235
1236         CDEBUG(D_HA, "%s: connection from %s@%s %st%llu exp %p cur %ld last %ld\n",
1237                target->obd_name, cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
1238               target->obd_recovering ? "recovering/" : "", data->ocd_transno,
1239               export, (long)cfs_time_current_sec(),
1240               export ? (long)export->exp_last_request_time : 0);
1241
1242         /* If this is the first time a client connects, reset the recovery
1243          * timer. Discard lightweight connections which might be local. */
1244         if (!lw_client && rc == 0 && target->obd_recovering)
1245                 check_and_start_recovery_timer(target, req, export == NULL);
1246
1247         /* We want to handle EALREADY but *not* -EALREADY from
1248          * target_handle_reconnect(), return reconnection state in a flag. */
1249         if (rc == EALREADY) {
1250                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECONNECT);
1251                 rc = 0;
1252         } else {
1253                 LASSERT(rc == 0);
1254         }
1255
1256         /* Tell the client if we support replayable requests. */
1257         if (target->obd_replayable)
1258                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_REPLAYABLE);
1259         client_nid = &req->rq_peer.nid;
1260
1261         if (export == NULL) {
1262                 /* allow lightweight connections during recovery */
1263                 /* allow "new" MDT to be connected during recovery, since we
1264                  * need retrieve recovery update records from it */
1265                 if (target->obd_recovering && !lw_client && !mds_mds_conn) {
1266                         cfs_time_t t;
1267                         int     c; /* connected */
1268                         int     i; /* in progress */
1269                         int     k; /* known */
1270                         int     s; /* stale/evicted */
1271
1272                         c = atomic_read(&target->obd_connected_clients);
1273                         i = atomic_read(&target->obd_lock_replay_clients);
1274                         k = target->obd_max_recoverable_clients;
1275                         s = target->obd_stale_clients;
1276                         t = target->obd_recovery_timer.expires;
1277                         t = cfs_time_sub(t, cfs_time_current());
1278                         t = cfs_duration_sec(t);
1279                         LCONSOLE_WARN("%s: Denying connection for new client %s"
1280                                       "(at %s), waiting for %d known clients "
1281                                       "(%d recovered, %d in progress, and %d "
1282                                       "evicted) to recover in %d:%.02d\n",
1283                                       target->obd_name, cluuid.uuid,
1284                                       libcfs_nid2str(req->rq_peer.nid), k,
1285                                       c - i, i, s, (int)t / 60,
1286                                       (int)t % 60);
1287                         rc = -EBUSY;
1288                 } else {
1289 dont_check_exports:
1290                         rc = obd_connect(req->rq_svc_thread->t_env,
1291                                          &export, target, &cluuid, data,
1292                                          client_nid);
1293                         if (mds_conn && OBD_FAIL_CHECK(OBD_FAIL_TGT_RCVG_FLAG))
1294                                 lustre_msg_add_op_flags(req->rq_repmsg,
1295                                                         MSG_CONNECT_RECOVERING);
1296                         if (rc == 0) {
1297                                 conn.cookie = export->exp_handle.h_cookie;
1298                                 rc = rev_import_init(export);
1299                         }
1300
1301                         if (mds_mds_conn)
1302                                 new_mds_mds_conn = true;
1303                 }
1304         } else {
1305                 rc = obd_reconnect(req->rq_svc_thread->t_env,
1306                                    export, target, &cluuid, data, client_nid);
1307         }
1308         if (rc)
1309                 GOTO(out, rc);
1310
1311         LASSERT(target->u.obt.obt_magic == OBT_MAGIC);
1312         data->ocd_instance = target->u.obt.obt_instance;
1313
1314         /* Return only the parts of obd_connect_data that we understand, so the
1315          * client knows that we don't understand the rest. */
1316         if (data) {
1317                 tmpsize = req_capsule_get_size(&req->rq_pill, &RMF_CONNECT_DATA,
1318                                                RCL_SERVER);
1319                 tmpdata = req_capsule_server_get(&req->rq_pill,
1320                                                  &RMF_CONNECT_DATA);
1321                 /* Don't use struct assignment here, because the client reply
1322                  * buffer may be smaller/larger than the local struct
1323                  * obd_connect_data. */
1324                 memcpy(tmpdata, data, min(tmpsize, size));
1325         }
1326
1327         /* If the client and the server are the same node, we will already
1328          * have an export that really points to the client's DLM export,
1329          * because we have a shared handles table.
1330          *
1331          * XXX this will go away when shaver stops sending the "connect" handle
1332          * in the real "remote handle" field of the request --phik 24 Apr 2003
1333          */
1334         ptlrpc_request_change_export(req, export);
1335
1336         spin_lock(&export->exp_lock);
1337         if (export->exp_conn_cnt >= lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
1338                 spin_unlock(&export->exp_lock);
1339                 CDEBUG(D_RPCTRACE, "%s: %s already connected at greater "
1340                        "or equal conn_cnt: %d >= %d\n",
1341                        cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
1342                        export->exp_conn_cnt,
1343                        lustre_msg_get_conn_cnt(req->rq_reqmsg));
1344
1345                 GOTO(out, rc = -EALREADY);
1346         }
1347         LASSERT(lustre_msg_get_conn_cnt(req->rq_reqmsg) > 0);
1348         export->exp_conn_cnt = lustre_msg_get_conn_cnt(req->rq_reqmsg);
1349
1350         /* Don't evict liblustre clients for not pinging. */
1351         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
1352                 export->exp_libclient = 1;
1353                 spin_unlock(&export->exp_lock);
1354
1355                 spin_lock(&target->obd_dev_lock);
1356                 list_del_init(&export->exp_obd_chain_timed);
1357                 spin_unlock(&target->obd_dev_lock);
1358         } else {
1359                 spin_unlock(&export->exp_lock);
1360         }
1361
1362         if (export->exp_connection != NULL) {
1363                 /* Check to see if connection came from another NID. */
1364                 if ((export->exp_connection->c_peer.nid != req->rq_peer.nid) &&
1365                     !hlist_unhashed(&export->exp_nid_hash))
1366                         cfs_hash_del(export->exp_obd->obd_nid_hash,
1367                                      &export->exp_connection->c_peer.nid,
1368                                      &export->exp_nid_hash);
1369
1370                 ptlrpc_connection_put(export->exp_connection);
1371         }
1372
1373         export->exp_connection = ptlrpc_connection_get(req->rq_peer,
1374                                                        req->rq_self,
1375                                                        &cluuid);
1376         if (hlist_unhashed(&export->exp_nid_hash))
1377                 cfs_hash_add(export->exp_obd->obd_nid_hash,
1378                              &export->exp_connection->c_peer.nid,
1379                              &export->exp_nid_hash);
1380
1381         lustre_msg_set_handle(req->rq_repmsg, &conn);
1382
1383         rc = rev_import_reconnect(export, req);
1384         if (rc != 0)
1385                 GOTO(out, rc);
1386
1387         if (target->obd_recovering && !export->exp_in_recovery && !lw_client) {
1388                 int has_transno;
1389                 __u64 transno = data->ocd_transno;
1390
1391                 spin_lock(&export->exp_lock);
1392                 /* possible race with class_disconnect_stale_exports,
1393                  * export may be already in the eviction process */
1394                 if (export->exp_failed) {
1395                         spin_unlock(&export->exp_lock);
1396                         GOTO(out, rc = -ENODEV);
1397                 }
1398                 export->exp_in_recovery = 1;
1399                 export->exp_req_replay_needed = 1;
1400                 export->exp_lock_replay_needed = 1;
1401                 spin_unlock(&export->exp_lock);
1402
1403                 has_transno = !!(lustre_msg_get_op_flags(req->rq_reqmsg) &
1404                                  MSG_CONNECT_TRANSNO);
1405                 if (has_transno && transno == 0)
1406                         CWARN("Connect with zero transno!\n");
1407
1408                 if (has_transno && transno > 0 &&
1409                     transno < target->obd_next_recovery_transno &&
1410                     transno > target->obd_last_committed) {
1411                         /* Another way is to use cmpxchg() to be lock-free. */
1412                         spin_lock(&target->obd_recovery_task_lock);
1413                         if (transno < target->obd_next_recovery_transno)
1414                                 target->obd_next_recovery_transno = transno;
1415                         spin_unlock(&target->obd_recovery_task_lock);
1416                 }
1417
1418                 atomic_inc(&target->obd_req_replay_clients);
1419                 atomic_inc(&target->obd_lock_replay_clients);
1420                 /* Note: MDS-MDS connection is allowed to be connected during
1421                  * recovery, no matter if the exports needs to be recoveried.
1422                  * Because we need retrieve updates logs from all other MDTs.
1423                  * So if the MDS-MDS export is new, obd_max_recoverable_clients
1424                  * also needs to be increased to match other recovery checking
1425                  * condition. */
1426                 if (new_mds_mds_conn)
1427                         target->obd_max_recoverable_clients++;
1428                 if (atomic_inc_return(&target->obd_connected_clients) ==
1429                     target->obd_max_recoverable_clients)
1430                         wake_up(&target->obd_next_transno_waitq);
1431         }
1432
1433         /* Tell the client we're in recovery, when client is involved in it. */
1434         if (target->obd_recovering && !lw_client)
1435                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECOVERING);
1436
1437 out:
1438         if (export) {
1439                 spin_lock(&export->exp_lock);
1440                 export->exp_connecting = 0;
1441                 spin_unlock(&export->exp_lock);
1442
1443                 class_export_put(export);
1444         }
1445         if (target_referenced == true && target != NULL) {
1446                 spin_lock(&target->obd_dev_lock);
1447                 target->obd_conn_inprogress--;
1448                 spin_unlock(&target->obd_dev_lock);
1449
1450                 class_decref(target, __func__, current);
1451         }
1452         req->rq_status = rc;
1453         RETURN(rc);
1454 }
1455
1456 int target_handle_disconnect(struct ptlrpc_request *req)
1457 {
1458         int rc;
1459         ENTRY;
1460
1461         rc = req_capsule_server_pack(&req->rq_pill);
1462         if (rc)
1463                 RETURN(rc);
1464
1465         /* Keep the rq_export around so we can send the reply. */
1466         req->rq_status = obd_disconnect(class_export_get(req->rq_export));
1467
1468         RETURN(0);
1469 }
1470
1471 void target_destroy_export(struct obd_export *exp)
1472 {
1473         struct obd_import       *imp = NULL;
1474         /* exports created from last_rcvd data, and "fake"
1475            exports created by lctl don't have an import */
1476         spin_lock(&exp->exp_lock);
1477         if (exp->exp_imp_reverse != NULL) {
1478                 imp = exp->exp_imp_reverse;
1479                 exp->exp_imp_reverse = NULL;
1480         }
1481         spin_unlock(&exp->exp_lock);
1482         if (imp != NULL)
1483                 client_destroy_import(imp);
1484
1485         LASSERT_ATOMIC_ZERO(&exp->exp_locks_count);
1486         LASSERT_ATOMIC_ZERO(&exp->exp_rpc_count);
1487         LASSERT_ATOMIC_ZERO(&exp->exp_cb_count);
1488         LASSERT_ATOMIC_ZERO(&exp->exp_replay_count);
1489 }
1490 EXPORT_SYMBOL(target_destroy_export);
1491
1492 /*
1493  * Recovery functions
1494  */
1495 static void target_request_copy_get(struct ptlrpc_request *req)
1496 {
1497         class_export_rpc_inc(req->rq_export);
1498         LASSERT(list_empty(&req->rq_list));
1499         INIT_LIST_HEAD(&req->rq_replay_list);
1500
1501         /* Increase refcount to keep request in queue. */
1502         atomic_inc(&req->rq_refcount);
1503         /* Let export know it has replays to be handled. */
1504         atomic_inc(&req->rq_export->exp_replay_count);
1505 }
1506
1507 static void target_request_copy_put(struct ptlrpc_request *req)
1508 {
1509         LASSERT(list_empty(&req->rq_replay_list));
1510         LASSERT_ATOMIC_POS(&req->rq_export->exp_replay_count);
1511
1512         atomic_dec(&req->rq_export->exp_replay_count);
1513         class_export_rpc_dec(req->rq_export);
1514         ptlrpc_server_drop_request(req);
1515 }
1516
1517 static int target_exp_enqueue_req_replay(struct ptlrpc_request *req)
1518 {
1519         __u64                  transno = lustre_msg_get_transno(req->rq_reqmsg);
1520         struct obd_export     *exp = req->rq_export;
1521         struct ptlrpc_request *reqiter;
1522         struct ptlrpc_request *dup_req = NULL;
1523         int                    dup = 0;
1524
1525         LASSERT(exp);
1526
1527         spin_lock(&exp->exp_lock);
1528         list_for_each_entry(reqiter, &exp->exp_req_replay_queue,
1529                                 rq_replay_list) {
1530                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) == transno) {
1531                         dup_req = reqiter;
1532                         dup = 1;
1533                         break;
1534                 }
1535         }
1536
1537         if (dup) {
1538                 /* We expect it with RESENT and REPLAY flags. */
1539                 if ((lustre_msg_get_flags(req->rq_reqmsg) &
1540                      (MSG_RESENT | MSG_REPLAY)) != (MSG_RESENT | MSG_REPLAY))
1541                         CERROR("invalid flags %x of resent replay\n",
1542                                lustre_msg_get_flags(req->rq_reqmsg));
1543
1544                 if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY) {
1545                         __u32 new_conn;
1546
1547                         new_conn = lustre_msg_get_conn_cnt(req->rq_reqmsg);
1548                         if (new_conn >
1549                             lustre_msg_get_conn_cnt(dup_req->rq_reqmsg))
1550                                 lustre_msg_set_conn_cnt(dup_req->rq_reqmsg,
1551                                                         new_conn);
1552                 }
1553         } else {
1554                 list_add_tail(&req->rq_replay_list,
1555                                   &exp->exp_req_replay_queue);
1556         }
1557
1558         spin_unlock(&exp->exp_lock);
1559         return dup;
1560 }
1561
1562 static void target_exp_dequeue_req_replay(struct ptlrpc_request *req)
1563 {
1564         LASSERT(!list_empty(&req->rq_replay_list));
1565         LASSERT(req->rq_export);
1566
1567         spin_lock(&req->rq_export->exp_lock);
1568         list_del_init(&req->rq_replay_list);
1569         spin_unlock(&req->rq_export->exp_lock);
1570 }
1571
1572 static void target_finish_recovery(struct lu_target *lut)
1573 {
1574         struct obd_device *obd = lut->lut_obd;
1575         ENTRY;
1576
1577         /* Only log a recovery message when recovery has occurred. */
1578         if (obd->obd_recovery_start) {
1579                 time64_t now = ktime_get_real_seconds();
1580                 time64_t elapsed_time;
1581
1582                 elapsed_time = max_t(time64_t, now - obd->obd_recovery_start, 1);
1583                 LCONSOLE_INFO("%s: Recovery over after %lld:%.02lld, of %d clients "
1584                         "%d recovered and %d %s evicted.\n", obd->obd_name,
1585                         (s64)elapsed_time / 60, (s64)elapsed_time % 60,
1586                         obd->obd_max_recoverable_clients,
1587                         atomic_read(&obd->obd_connected_clients),
1588                         obd->obd_stale_clients,
1589                         obd->obd_stale_clients == 1 ? "was" : "were");
1590         }
1591
1592         ldlm_reprocess_recovery_done(obd->obd_namespace);
1593         spin_lock(&obd->obd_recovery_task_lock);
1594         if (!list_empty(&obd->obd_req_replay_queue) ||
1595             !list_empty(&obd->obd_lock_replay_queue) ||
1596             !list_empty(&obd->obd_final_req_queue)) {
1597                 CERROR("%s: Recovery queues ( %s%s%s) are not empty\n",
1598                        obd->obd_name,
1599                        list_empty(&obd->obd_req_replay_queue) ? "" : "req ",
1600                        list_empty(&obd->obd_lock_replay_queue) ? \
1601                                "" : "lock ",
1602                        list_empty(&obd->obd_final_req_queue) ? \
1603                                "" : "final ");
1604                 spin_unlock(&obd->obd_recovery_task_lock);
1605                 LBUG();
1606         }
1607         spin_unlock(&obd->obd_recovery_task_lock);
1608
1609         obd->obd_recovery_end = ktime_get_real_seconds();
1610
1611         /* When recovery finished, cleanup orphans on MDS and OST. */
1612         if (OBT(obd) && OBP(obd, postrecov)) {
1613                 int rc = OBP(obd, postrecov)(obd);
1614                 if (rc < 0)
1615                         LCONSOLE_WARN("%s: Post recovery failed, rc %d\n",
1616                                       obd->obd_name, rc);
1617         }
1618         EXIT;
1619 }
1620
1621 static void abort_req_replay_queue(struct obd_device *obd)
1622 {
1623         struct ptlrpc_request *req, *n;
1624         struct list_head abort_list;
1625
1626         INIT_LIST_HEAD(&abort_list);
1627         spin_lock(&obd->obd_recovery_task_lock);
1628         list_splice_init(&obd->obd_req_replay_queue, &abort_list);
1629         spin_unlock(&obd->obd_recovery_task_lock);
1630         list_for_each_entry_safe(req, n, &abort_list, rq_list) {
1631                 DEBUG_REQ(D_WARNING, req, "aborted:");
1632                 req->rq_status = -ENOTCONN;
1633                 if (ptlrpc_error(req)) {
1634                         DEBUG_REQ(D_ERROR, req,
1635                                   "failed abort_req_reply; skipping");
1636                 }
1637                 target_exp_dequeue_req_replay(req);
1638                 target_request_copy_put(req);
1639         }
1640 }
1641
1642 static void abort_lock_replay_queue(struct obd_device *obd)
1643 {
1644         struct ptlrpc_request *req, *n;
1645         struct list_head abort_list;
1646
1647         INIT_LIST_HEAD(&abort_list);
1648         spin_lock(&obd->obd_recovery_task_lock);
1649         list_splice_init(&obd->obd_lock_replay_queue, &abort_list);
1650         spin_unlock(&obd->obd_recovery_task_lock);
1651         list_for_each_entry_safe(req, n, &abort_list, rq_list) {
1652                 DEBUG_REQ(D_ERROR, req, "aborted:");
1653                 req->rq_status = -ENOTCONN;
1654                 if (ptlrpc_error(req)) {
1655                         DEBUG_REQ(D_ERROR, req,
1656                                   "failed abort_lock_reply; skipping");
1657                 }
1658                 target_request_copy_put(req);
1659         }
1660 }
1661
1662 /* Called from a cleanup function if the device is being cleaned up
1663    forcefully.  The exports should all have been disconnected already,
1664    the only thing left to do is
1665      - clear the recovery flags
1666      - cancel the timer
1667      - free queued requests and replies, but don't send replies
1668    Because the obd_stopping flag is set, no new requests should be received.
1669
1670 */
1671 void target_cleanup_recovery(struct obd_device *obd)
1672 {
1673         struct ptlrpc_request *req, *n;
1674         struct list_head clean_list;
1675
1676         INIT_LIST_HEAD(&clean_list);
1677         spin_lock(&obd->obd_dev_lock);
1678         if (!obd->obd_recovering) {
1679                 spin_unlock(&obd->obd_dev_lock);
1680                 EXIT;
1681                 return;
1682         }
1683         obd->obd_recovering = obd->obd_abort_recovery = 0;
1684         spin_unlock(&obd->obd_dev_lock);
1685
1686         spin_lock(&obd->obd_recovery_task_lock);
1687         target_cancel_recovery_timer(obd);
1688         list_splice_init(&obd->obd_req_replay_queue, &clean_list);
1689         spin_unlock(&obd->obd_recovery_task_lock);
1690
1691         list_for_each_entry_safe(req, n, &clean_list, rq_list) {
1692                 LASSERT(req->rq_reply_state == NULL);
1693                 target_exp_dequeue_req_replay(req);
1694                 target_request_copy_put(req);
1695         }
1696
1697         spin_lock(&obd->obd_recovery_task_lock);
1698         list_splice_init(&obd->obd_lock_replay_queue, &clean_list);
1699         list_splice_init(&obd->obd_final_req_queue, &clean_list);
1700         spin_unlock(&obd->obd_recovery_task_lock);
1701
1702         list_for_each_entry_safe(req, n, &clean_list, rq_list) {
1703                 LASSERT(req->rq_reply_state == NULL);
1704                 target_request_copy_put(req);
1705         }
1706
1707         EXIT;
1708 }
1709 EXPORT_SYMBOL(target_cleanup_recovery);
1710
1711 /* obd_recovery_task_lock should be held */
1712 void target_cancel_recovery_timer(struct obd_device *obd)
1713 {
1714         CDEBUG(D_HA, "%s: cancel recovery timer\n", obd->obd_name);
1715         del_timer(&obd->obd_recovery_timer);
1716 }
1717
1718 static void target_start_recovery_timer(struct obd_device *obd)
1719 {
1720         if (obd->obd_recovery_start != 0)
1721                 return;
1722
1723         spin_lock(&obd->obd_dev_lock);
1724         if (!obd->obd_recovering || obd->obd_abort_recovery) {
1725                 spin_unlock(&obd->obd_dev_lock);
1726                 return;
1727         }
1728
1729         LASSERT(obd->obd_recovery_timeout != 0);
1730
1731         if (obd->obd_recovery_start != 0) {
1732                 spin_unlock(&obd->obd_dev_lock);
1733                 return;
1734         }
1735
1736         mod_timer(&obd->obd_recovery_timer,
1737                   cfs_time_shift(obd->obd_recovery_timeout));
1738         obd->obd_recovery_start = ktime_get_real_seconds();
1739         spin_unlock(&obd->obd_dev_lock);
1740
1741         LCONSOLE_WARN("%s: Will be in recovery for at least %llu:%02llu, or until %d client%s reconnect%s\n",
1742                       obd->obd_name,
1743                       obd->obd_recovery_timeout / 60,
1744                       obd->obd_recovery_timeout % 60,
1745                       obd->obd_max_recoverable_clients,
1746                       (obd->obd_max_recoverable_clients == 1) ? "" : "s",
1747                       (obd->obd_max_recoverable_clients == 1) ? "s": "");
1748 }
1749
1750 /**
1751  * extend recovery window.
1752  *
1753  * if @extend is true, extend recovery window to have @drt remaining at least;
1754  * otherwise, make sure the recovery timeout value is not less than @drt.
1755  */
1756 static void extend_recovery_timer(struct obd_device *obd, int drt,
1757                                   bool extend)
1758 {
1759         time64_t now;
1760         time64_t end;
1761         time64_t left;
1762         time64_t to;
1763
1764         spin_lock(&obd->obd_dev_lock);
1765         if (!obd->obd_recovering || obd->obd_abort_recovery) {
1766                 spin_unlock(&obd->obd_dev_lock);
1767                 return;
1768         }
1769         LASSERT(obd->obd_recovery_start != 0);
1770
1771         now = ktime_get_real_seconds();
1772         to = obd->obd_recovery_timeout;
1773         end = obd->obd_recovery_start + to;
1774         left = end - now;
1775
1776         if (extend && (drt > left)) {
1777                 to += drt - left;
1778         } else if (!extend && (drt > to)) {
1779                 to = drt;
1780         }
1781
1782         if (to > obd->obd_recovery_time_hard) {
1783                 to = obd->obd_recovery_time_hard;
1784                 CWARN("%s: extended recovery timer reaching hard limit: %lld, extend: %d\n",
1785                       obd->obd_name, to, extend);
1786         }
1787
1788         if (obd->obd_recovery_timeout < to) {
1789                 obd->obd_recovery_timeout = to;
1790                 end = obd->obd_recovery_start + to;
1791                 mod_timer(&obd->obd_recovery_timer,
1792                           cfs_time_shift(end - now));
1793         }
1794         spin_unlock(&obd->obd_dev_lock);
1795
1796         CDEBUG(D_HA, "%s: recovery timer will expire in %lld seconds\n",
1797                 obd->obd_name, (s64)(end - now));
1798 }
1799
1800 /* Reset the timer with each new client connection */
1801 /*
1802  * This timer is actually reconnect_timer, which is for making sure
1803  * the total recovery window is at least as big as my reconnect
1804  * attempt timing. So the initial recovery time_out will be set to
1805  * OBD_RECOVERY_FACTOR * obd_timeout. If the timeout coming
1806  * from client is bigger than this, then the recovery time_out will
1807  * be extended to make sure the client could be reconnected, in the
1808  * process, the timeout from the new client should be ignored.
1809  */
1810
1811 static void
1812 check_and_start_recovery_timer(struct obd_device *obd,
1813                                struct ptlrpc_request *req,
1814                                int new_client)
1815 {
1816         int service_time = lustre_msg_get_service_time(req->rq_reqmsg);
1817         struct obd_device_target *obt = &obd->u.obt;
1818
1819         if (!new_client && service_time)
1820                 /* Teach server about old server's estimates, as first guess
1821                  * at how long new requests will take. */
1822                 at_measured(&req->rq_rqbd->rqbd_svcpt->scp_at_estimate,
1823                             service_time);
1824
1825         target_start_recovery_timer(obd);
1826
1827         /* Convert the service time to RPC timeout,
1828          * and reuse service_time to limit stack usage. */
1829         service_time = at_est2timeout(service_time);
1830
1831         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_SLUGGISH_NET) &&
1832             service_time < at_extra)
1833                 service_time = at_extra;
1834
1835         /* We expect other clients to timeout within service_time, then try
1836          * to reconnect, then try the failover server.  The max delay between
1837          * connect attempts is SWITCH_MAX + SWITCH_INC + INITIAL. */
1838         service_time += 2 * INITIAL_CONNECT_TIMEOUT;
1839
1840         LASSERT(obt->obt_magic == OBT_MAGIC);
1841         service_time += 2 * (CONNECTION_SWITCH_MAX + CONNECTION_SWITCH_INC);
1842         if (service_time > obd->obd_recovery_timeout && !new_client)
1843                 extend_recovery_timer(obd, service_time, false);
1844 }
1845
1846 /** Health checking routines */
1847 static inline int exp_connect_healthy(struct obd_export *exp)
1848 {
1849         return (exp->exp_in_recovery);
1850 }
1851
1852 /** if export done req_replay or has replay in queue */
1853 static inline int exp_req_replay_healthy(struct obd_export *exp)
1854 {
1855         return (!exp->exp_req_replay_needed ||
1856                 atomic_read(&exp->exp_replay_count) > 0);
1857 }
1858
1859
1860 static inline int exp_req_replay_healthy_or_from_mdt(struct obd_export *exp)
1861 {
1862         return (exp_connect_flags(exp) & OBD_CONNECT_MDS_MDS) ||
1863                exp_req_replay_healthy(exp);
1864 }
1865
1866 /** if export done lock_replay or has replay in queue */
1867 static inline int exp_lock_replay_healthy(struct obd_export *exp)
1868 {
1869         return (!exp->exp_lock_replay_needed ||
1870                 atomic_read(&exp->exp_replay_count) > 0);
1871 }
1872
1873 static inline int exp_vbr_healthy(struct obd_export *exp)
1874 {
1875         return (!exp->exp_vbr_failed);
1876 }
1877
1878 static inline int exp_finished(struct obd_export *exp)
1879 {
1880         return (exp->exp_in_recovery && !exp->exp_lock_replay_needed);
1881 }
1882
1883 static inline int exp_finished_or_from_mdt(struct obd_export *exp)
1884 {
1885         return (exp_connect_flags(exp) & OBD_CONNECT_MDS_MDS) ||
1886                 exp_finished(exp);
1887 }
1888
1889 static int check_for_next_transno(struct lu_target *lut)
1890 {
1891         struct ptlrpc_request *req = NULL;
1892         struct obd_device *obd = lut->lut_obd;
1893         struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
1894         int wake_up = 0, connected, completed, queue_len;
1895         __u64 req_transno = 0;
1896         __u64 update_transno = 0;
1897         __u64 next_transno = 0;
1898         ENTRY;
1899
1900         spin_lock(&obd->obd_recovery_task_lock);
1901         if (!list_empty(&obd->obd_req_replay_queue)) {
1902                 req = list_entry(obd->obd_req_replay_queue.next,
1903                                      struct ptlrpc_request, rq_list);
1904                 req_transno = lustre_msg_get_transno(req->rq_reqmsg);
1905         }
1906
1907         if (tdtd != NULL)
1908                 update_transno = distribute_txn_get_next_transno(tdtd);
1909
1910         connected = atomic_read(&obd->obd_connected_clients);
1911         completed = connected - atomic_read(&obd->obd_req_replay_clients);
1912         queue_len = obd->obd_requests_queued_for_recovery;
1913         next_transno = obd->obd_next_recovery_transno;
1914
1915         CDEBUG(D_HA, "max: %d, connected: %d, completed: %d, queue_len: %d, "
1916                "req_transno: %llu, next_transno: %llu\n",
1917                obd->obd_max_recoverable_clients, connected, completed,
1918                queue_len, req_transno, next_transno);
1919
1920         if (obd->obd_abort_recovery) {
1921                 CDEBUG(D_HA, "waking for aborted recovery\n");
1922                 wake_up = 1;
1923         } else if (obd->obd_recovery_expired) {
1924                 CDEBUG(D_HA, "waking for expired recovery\n");
1925                 wake_up = 1;
1926         } else if (tdtd != NULL && req != NULL &&
1927                    is_req_replayed_by_update(req)) {
1928                 LASSERTF(req_transno < next_transno, "req_transno %llu"
1929                          "next_transno%llu\n", req_transno, next_transno);
1930                 CDEBUG(D_HA, "waking for duplicate req (%llu)\n",
1931                        req_transno);
1932                 wake_up = 1;
1933         } else if (req_transno == next_transno ||
1934                    (update_transno != 0 && update_transno <= next_transno)) {
1935                 CDEBUG(D_HA, "waking for next (%lld)\n", next_transno);
1936                 wake_up = 1;
1937         } else if (queue_len > 0 &&
1938                    queue_len == atomic_read(&obd->obd_req_replay_clients)) {
1939                 /** handle gaps occured due to lost reply or VBR */
1940                 LASSERTF(req_transno >= next_transno,
1941                          "req_transno: %llu, next_transno: %llu\n",
1942                          req_transno, next_transno);
1943                 CDEBUG(D_HA,
1944                        "%s: waking for gap in transno, VBR is %s (skip: "
1945                        "%lld, ql: %d, comp: %d, conn: %d, next: %lld"
1946                        ", next_update %lld last_committed: %lld)\n",
1947                        obd->obd_name, obd->obd_version_recov ? "ON" : "OFF",
1948                        next_transno, queue_len, completed, connected,
1949                        req_transno, update_transno, obd->obd_last_committed);
1950                 obd->obd_next_recovery_transno = req_transno;
1951                 wake_up = 1;
1952         } else if (atomic_read(&obd->obd_req_replay_clients) == 0) {
1953                 CDEBUG(D_HA, "waking for completed recovery\n");
1954                 wake_up = 1;
1955         } else if (OBD_FAIL_CHECK(OBD_FAIL_MDS_RECOVERY_ACCEPTS_GAPS)) {
1956                 CDEBUG(D_HA, "accepting transno gaps is explicitly allowed"
1957                        " by fail_lock, waking up (%lld)\n", next_transno);
1958                 obd->obd_next_recovery_transno = req_transno;
1959                 wake_up = 1;
1960         }
1961         spin_unlock(&obd->obd_recovery_task_lock);
1962         return wake_up;
1963 }
1964
1965 static int check_for_next_lock(struct lu_target *lut)
1966 {
1967         struct obd_device *obd = lut->lut_obd;
1968         int wake_up = 0;
1969
1970         spin_lock(&obd->obd_recovery_task_lock);
1971         if (!list_empty(&obd->obd_lock_replay_queue)) {
1972                 CDEBUG(D_HA, "waking for next lock\n");
1973                 wake_up = 1;
1974         } else if (atomic_read(&obd->obd_lock_replay_clients) == 0) {
1975                 CDEBUG(D_HA, "waking for completed lock replay\n");
1976                 wake_up = 1;
1977         } else if (obd->obd_abort_recovery) {
1978                 CDEBUG(D_HA, "waking for aborted recovery\n");
1979                 wake_up = 1;
1980         } else if (obd->obd_recovery_expired) {
1981                 CDEBUG(D_HA, "waking for expired recovery\n");
1982                 wake_up = 1;
1983         }
1984         spin_unlock(&obd->obd_recovery_task_lock);
1985
1986         return wake_up;
1987 }
1988
1989 /**
1990  * wait for recovery events,
1991  * check its status with help of check_routine
1992  * evict dead clients via health_check
1993  */
1994 static int target_recovery_overseer(struct lu_target *lut,
1995                                     int (*check_routine)(struct lu_target *),
1996                                     int (*health_check)(struct obd_export *))
1997 {
1998         struct obd_device       *obd = lut->lut_obd;
1999         struct target_distribute_txn_data *tdtd;
2000 repeat:
2001         if (obd->obd_recovery_start != 0 && ktime_get_real_seconds() >=
2002               (obd->obd_recovery_start + obd->obd_recovery_time_hard)) {
2003                 __u64 next_update_transno = 0;
2004
2005                 /* Only abort the recovery if there are no update recovery
2006                  * left in the queue */
2007                 spin_lock(&obd->obd_recovery_task_lock);
2008                 if (lut->lut_tdtd != NULL) {
2009                         next_update_transno =
2010                                 distribute_txn_get_next_transno(lut->lut_tdtd);
2011
2012                         tdtd = lut->lut_tdtd;
2013                         /* If next_update_transno == 0, it probably because
2014                          * updatelog retrieve threads did not get any records
2015                          * yet, let's wait those threads stopped */
2016                         if (next_update_transno == 0) {
2017                                 struct l_wait_info lwi = { 0 };
2018
2019                                 l_wait_event(tdtd->tdtd_recovery_threads_waitq,
2020                                        atomic_read(
2021                                        &tdtd->tdtd_recovery_threads_count) == 0,
2022                                        &lwi);
2023
2024                                 next_update_transno =
2025                                         distribute_txn_get_next_transno(
2026                                                                 lut->lut_tdtd);
2027                         }
2028                 }
2029
2030                 if (next_update_transno != 0 && !obd->obd_abort_recovery) {
2031                         obd->obd_next_recovery_transno = next_update_transno;
2032                         spin_unlock(&obd->obd_recovery_task_lock);
2033                         /* Disconnect unfinished exports from clients, and
2034                          * keep connection from MDT to make sure the update
2035                          * recovery will still keep trying until some one
2036                          * manually abort the recovery */
2037                         class_disconnect_stale_exports(obd,
2038                                                 exp_finished_or_from_mdt);
2039                         /* Abort all of replay and replay lock req from
2040                          * clients */
2041                         abort_req_replay_queue(obd);
2042                         abort_lock_replay_queue(obd);
2043                         CDEBUG(D_HA, "%s: there are still update replay (%#llx"
2044                                ")in the queue.\n", obd->obd_name,
2045                                next_update_transno);
2046                 } else {
2047                         obd->obd_abort_recovery = 1;
2048                         spin_unlock(&obd->obd_recovery_task_lock);
2049                         CWARN("%s recovery is aborted by hard timeout\n",
2050                               obd->obd_name);
2051                 }
2052         }
2053
2054         while (wait_event_timeout(obd->obd_next_transno_waitq,
2055                                   check_routine(lut),
2056                                   msecs_to_jiffies(60 * MSEC_PER_SEC)) == 0)
2057                 /* wait indefinitely for event, but don't trigger watchdog */;
2058
2059         if (obd->obd_abort_recovery) {
2060                 CWARN("recovery is aborted, evict exports in recovery\n");
2061                 if (lut->lut_tdtd != NULL) {
2062                         struct l_wait_info lwi = { 0 };
2063
2064                         tdtd = lut->lut_tdtd;
2065                         /* Let's wait all of the update log recovery thread
2066                          * finished */
2067                         l_wait_event(tdtd->tdtd_recovery_threads_waitq,
2068                          atomic_read(&tdtd->tdtd_recovery_threads_count) == 0,
2069                              &lwi);
2070                         /* Then abort the update recovery list */
2071                         dtrq_list_destroy(lut->lut_tdtd);
2072                 }
2073
2074                 /** evict exports which didn't finish recovery yet */
2075                 class_disconnect_stale_exports(obd, exp_finished);
2076                 return 1;
2077         } else if (obd->obd_recovery_expired) {
2078                 obd->obd_recovery_expired = 0;
2079                 /** If some clients died being recovered, evict them */
2080                 LCONSOLE_WARN("%s: recovery is timed out, "
2081                               "evict stale exports\n", obd->obd_name);
2082                 /** evict cexports with no replay in queue, they are stalled */
2083                 class_disconnect_stale_exports(obd, health_check);
2084
2085                 /** continue with VBR */
2086                 spin_lock(&obd->obd_dev_lock);
2087                 obd->obd_version_recov = 1;
2088                 spin_unlock(&obd->obd_dev_lock);
2089                 /**
2090                  * reset timer, recovery will proceed with versions now,
2091                  * timeout is set just to handle reconnection delays
2092                  */
2093                 extend_recovery_timer(obd, RECONNECT_DELAY_MAX, true);
2094                 /** Wait for recovery events again, after evicting bad clients */
2095                 goto repeat;
2096         }
2097         return 0;
2098 }
2099
2100 static struct ptlrpc_request *target_next_replay_lock(struct lu_target *lut)
2101 {
2102         struct obd_device       *obd = lut->lut_obd;
2103         struct ptlrpc_request *req = NULL;
2104
2105         CDEBUG(D_HA, "Waiting for lock\n");
2106         if (target_recovery_overseer(lut, check_for_next_lock,
2107                                      exp_lock_replay_healthy))
2108                 abort_lock_replay_queue(obd);
2109
2110         spin_lock(&obd->obd_recovery_task_lock);
2111         if (!list_empty(&obd->obd_lock_replay_queue)) {
2112                 req = list_entry(obd->obd_lock_replay_queue.next,
2113                                      struct ptlrpc_request, rq_list);
2114                 list_del_init(&req->rq_list);
2115                 spin_unlock(&obd->obd_recovery_task_lock);
2116         } else {
2117                 spin_unlock(&obd->obd_recovery_task_lock);
2118                 LASSERT(list_empty(&obd->obd_lock_replay_queue));
2119                 LASSERT(atomic_read(&obd->obd_lock_replay_clients) == 0);
2120                 /** evict exports failed VBR */
2121                 class_disconnect_stale_exports(obd, exp_vbr_healthy);
2122         }
2123         return req;
2124 }
2125
2126 static struct ptlrpc_request *target_next_final_ping(struct obd_device *obd)
2127 {
2128         struct ptlrpc_request *req = NULL;
2129
2130         spin_lock(&obd->obd_recovery_task_lock);
2131         if (!list_empty(&obd->obd_final_req_queue)) {
2132                 req = list_entry(obd->obd_final_req_queue.next,
2133                                      struct ptlrpc_request, rq_list);
2134                 list_del_init(&req->rq_list);
2135                 spin_unlock(&obd->obd_recovery_task_lock);
2136                 if (req->rq_export->exp_in_recovery) {
2137                         spin_lock(&req->rq_export->exp_lock);
2138                         req->rq_export->exp_in_recovery = 0;
2139                         spin_unlock(&req->rq_export->exp_lock);
2140                 }
2141         } else {
2142                 spin_unlock(&obd->obd_recovery_task_lock);
2143         }
2144         return req;
2145 }
2146
2147 static void handle_recovery_req(struct ptlrpc_thread *thread,
2148                                 struct ptlrpc_request *req,
2149                                 svc_handler_t handler)
2150 {
2151         ENTRY;
2152
2153         /**
2154          * export can be evicted during recovery, no need to handle replays for
2155          * it after that, discard such request silently
2156          */
2157         if (req->rq_export->exp_disconnected)
2158                 RETURN_EXIT;
2159
2160         req->rq_session.lc_thread = thread;
2161         req->rq_svc_thread = thread;
2162         req->rq_svc_thread->t_env->le_ses = &req->rq_session;
2163
2164         /* thread context */
2165         lu_context_enter(&thread->t_env->le_ctx);
2166         (void)handler(req);
2167         lu_context_exit(&thread->t_env->le_ctx);
2168
2169         /* don't reset timer for final stage */
2170         if (!exp_finished(req->rq_export)) {
2171                 int to = obd_timeout;
2172
2173                 /**
2174                  * Add request timeout to the recovery time so next request from
2175                  * this client may come in recovery time
2176                  */
2177                 if (!AT_OFF) {
2178                         struct ptlrpc_service_part *svcpt;
2179
2180                         svcpt = req->rq_rqbd->rqbd_svcpt;
2181                         /* If the server sent early reply for this request,
2182                          * the client will recalculate the timeout according to
2183                          * current server estimate service time, so we will
2184                          * use the maxium timeout here for waiting the client
2185                          * sending the next req */
2186                         to = max((int)at_est2timeout(
2187                                  at_get(&svcpt->scp_at_estimate)),
2188                                  (int)lustre_msg_get_timeout(req->rq_reqmsg));
2189                         /* Add 2 net_latency, one for balance rq_deadline
2190                          * (see ptl_send_rpc), one for resend the req to server,
2191                          * Note: client will pack net_latency in replay req
2192                          * (see ptlrpc_replay_req) */
2193                         to += 2 * lustre_msg_get_service_time(req->rq_reqmsg);
2194                 }
2195                 extend_recovery_timer(class_exp2obd(req->rq_export), to, true);
2196         }
2197         EXIT;
2198 }
2199
2200 /** Checking routines for recovery */
2201 static int check_for_recovery_ready(struct lu_target *lut)
2202 {
2203         struct obd_device *obd = lut->lut_obd;
2204         unsigned int clnts = atomic_read(&obd->obd_connected_clients);
2205
2206         CDEBUG(D_HA, "connected %d stale %d max_recoverable_clients %d"
2207                " abort %d expired %d\n", clnts, obd->obd_stale_clients,
2208                obd->obd_max_recoverable_clients, obd->obd_abort_recovery,
2209                obd->obd_recovery_expired);
2210
2211         if (!obd->obd_abort_recovery && !obd->obd_recovery_expired) {
2212                 LASSERT(clnts <= obd->obd_max_recoverable_clients);
2213                 if (clnts + obd->obd_stale_clients <
2214                     obd->obd_max_recoverable_clients)
2215                         return 0;
2216         }
2217
2218         if (lut->lut_tdtd != NULL) {
2219                 if (!lut->lut_tdtd->tdtd_replay_ready &&
2220                     !obd->obd_abort_recovery) {
2221                         /* Let's extend recovery timer, in case the recovery
2222                          * timer expired, and some clients got evicted */
2223                         extend_recovery_timer(obd, obd->obd_recovery_timeout,
2224                                               true);
2225                         CDEBUG(D_HA, "%s update recovery is not ready, extend recovery %llu\n",
2226                                obd->obd_name, obd->obd_recovery_timeout);
2227                         return 0;
2228                 }
2229         }
2230
2231         return 1;
2232 }
2233
2234 enum {
2235         REQUEST_RECOVERY = 1,
2236         UPDATE_RECOVERY = 2,
2237 };
2238
2239 static __u64 get_next_replay_req_transno(struct obd_device *obd)
2240 {
2241         __u64 transno = 0;
2242
2243         if (!list_empty(&obd->obd_req_replay_queue)) {
2244                 struct ptlrpc_request *req;
2245
2246                 req = list_entry(obd->obd_req_replay_queue.next,
2247                                  struct ptlrpc_request, rq_list);
2248                 transno = lustre_msg_get_transno(req->rq_reqmsg);
2249         }
2250
2251         return transno;
2252 }
2253
2254 static __u64 get_next_transno(struct lu_target *lut, int *type)
2255 {
2256         struct obd_device *obd = lut->lut_obd;
2257         struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
2258         __u64 transno = 0;
2259         __u64 update_transno;
2260         ENTRY;
2261
2262         transno = get_next_replay_req_transno(obd);
2263         if (type != NULL)
2264                 *type = REQUEST_RECOVERY;
2265
2266         if (tdtd == NULL)
2267                 RETURN(transno);
2268
2269         update_transno = distribute_txn_get_next_transno(tdtd);
2270         if (transno == 0 || (transno >= update_transno &&
2271                              update_transno != 0)) {
2272                 transno = update_transno;
2273                 if (type != NULL)
2274                         *type = UPDATE_RECOVERY;
2275         }
2276
2277         RETURN(transno);
2278 }
2279
2280 /**
2281  * drop duplicate replay request
2282  *
2283  * Because the operation has been replayed by update recovery, the request
2284  * with the same transno will be dropped and also notify the client to send
2285  * next replay request.
2286  *
2287  * \param[in] env       execution environment
2288  * \param[in] obd       failover obd device
2289  * \param[in] req       request to be dropped
2290  */
2291 static void drop_duplicate_replay_req(struct lu_env *env,
2292                                       struct obd_device *obd,
2293                                       struct ptlrpc_request *req)
2294 {
2295         DEBUG_REQ(D_HA, req, "remove t%lld from %s because of duplicate"
2296                   " update records are found.\n",
2297                   lustre_msg_get_transno(req->rq_reqmsg),
2298                   libcfs_nid2str(req->rq_peer.nid));
2299
2300         /* Right now, only for MDS reint operation update replay and
2301          * normal request replay can have the same transno */
2302         if (lustre_msg_get_opc(req->rq_reqmsg) == MDS_REINT) {
2303                 req_capsule_set(&req->rq_pill, &RQF_MDS_REINT);
2304                 req->rq_status = req_capsule_server_pack(&req->rq_pill);
2305                 if (likely(req->rq_export))
2306                         target_committed_to_req(req);
2307                 lustre_msg_set_transno(req->rq_repmsg, req->rq_transno);
2308                 target_send_reply(req, req->rq_status, 0);
2309         } else {
2310                 DEBUG_REQ(D_ERROR, req, "wrong opc" "from %s\n",
2311                 libcfs_nid2str(req->rq_peer.nid));
2312         }
2313         target_exp_dequeue_req_replay(req);
2314         target_request_copy_put(req);
2315         obd->obd_replayed_requests++;
2316 }
2317
2318 static void replay_request_or_update(struct lu_env *env,
2319                                      struct lu_target *lut,
2320                                      struct target_recovery_data *trd,
2321                                      struct ptlrpc_thread *thread)
2322 {
2323         struct obd_device *obd = lut->lut_obd;
2324         struct ptlrpc_request *req = NULL;
2325         int                     type;
2326         __u64                   transno;
2327         ENTRY;
2328
2329         CDEBUG(D_HA, "Waiting for transno %lld\n",
2330                obd->obd_next_recovery_transno);
2331
2332         /* Replay all of request and update by transno */
2333         do {
2334                 struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
2335
2336                 CFS_FAIL_TIMEOUT(OBD_FAIL_TGT_REPLAY_DELAY2, cfs_fail_val);
2337
2338                 /** It is needed to extend recovery window above
2339                  *  recovery_time_soft. Extending is possible only in the
2340                  *  end of recovery window (see more details in
2341                  *  handle_recovery_req()).
2342                  */
2343                 CFS_FAIL_TIMEOUT_MS(OBD_FAIL_TGT_REPLAY_DELAY, 300);
2344
2345                 if (target_recovery_overseer(lut, check_for_next_transno,
2346                                         exp_req_replay_healthy_or_from_mdt)) {
2347                         abort_req_replay_queue(obd);
2348                         abort_lock_replay_queue(obd);
2349                         goto abort;
2350                 }
2351
2352                 spin_lock(&obd->obd_recovery_task_lock);
2353                 transno = get_next_transno(lut, &type);
2354                 if (type == REQUEST_RECOVERY && transno != 0) {
2355                         /* Drop replay request from client side, if the
2356                          * replay has been executed by update with the
2357                          * same transno */
2358                         req = list_entry(obd->obd_req_replay_queue.next,
2359                                         struct ptlrpc_request, rq_list);
2360
2361                         list_del_init(&req->rq_list);
2362                         obd->obd_requests_queued_for_recovery--;
2363                         spin_unlock(&obd->obd_recovery_task_lock);
2364
2365                         /* Let's check if the request has been redone by
2366                          * update replay */
2367                         if (is_req_replayed_by_update(req)) {
2368                                 struct distribute_txn_replay_req *dtrq;
2369
2370                                 dtrq = distribute_txn_lookup_finish_list(tdtd,
2371                                                                    req->rq_xid);
2372                                 LASSERT(dtrq != NULL);
2373                                 spin_lock(&tdtd->tdtd_replay_list_lock);
2374                                 list_del_init(&dtrq->dtrq_list);
2375                                 spin_unlock(&tdtd->tdtd_replay_list_lock);
2376                                 dtrq_destroy(dtrq);
2377
2378                                 drop_duplicate_replay_req(env, obd, req);
2379
2380                                 continue;
2381                         }
2382
2383                         LASSERT(trd->trd_processing_task == current_pid());
2384                         DEBUG_REQ(D_HA, req, "processing t%lld from %s",
2385                                   lustre_msg_get_transno(req->rq_reqmsg),
2386                                   libcfs_nid2str(req->rq_peer.nid));
2387
2388                         handle_recovery_req(thread, req,
2389                                             trd->trd_recovery_handler);
2390                         /**
2391                          * bz18031: increase next_recovery_transno before
2392                          * target_request_copy_put() will drop exp_rpc reference
2393                          */
2394                         spin_lock(&obd->obd_recovery_task_lock);
2395                         obd->obd_next_recovery_transno++;
2396                         spin_unlock(&obd->obd_recovery_task_lock);
2397                         target_exp_dequeue_req_replay(req);
2398                         target_request_copy_put(req);
2399                         obd->obd_replayed_requests++;
2400                 } else if (type == UPDATE_RECOVERY && transno != 0) {
2401                         struct distribute_txn_replay_req *dtrq;
2402                         int rc;
2403
2404                         spin_unlock(&obd->obd_recovery_task_lock);
2405
2406                         LASSERT(tdtd != NULL);
2407                         dtrq = distribute_txn_get_next_req(tdtd);
2408                         lu_context_enter(&thread->t_env->le_ctx);
2409                         rc = tdtd->tdtd_replay_handler(env, tdtd, dtrq);
2410                         lu_context_exit(&thread->t_env->le_ctx);
2411                         extend_recovery_timer(obd, obd_timeout, true);
2412
2413                         if (rc == 0 && dtrq->dtrq_xid != 0) {
2414                                 CDEBUG(D_HA, "Move x%llu t%llu"
2415                                        " to finish list\n", dtrq->dtrq_xid,
2416                                        dtrq->dtrq_master_transno);
2417
2418                                 /* Add it to the replay finish list */
2419                                 spin_lock(&tdtd->tdtd_replay_list_lock);
2420                                 list_add(&dtrq->dtrq_list,
2421                                          &tdtd->tdtd_replay_finish_list);
2422                                 spin_unlock(&tdtd->tdtd_replay_list_lock);
2423
2424                                 spin_lock(&obd->obd_recovery_task_lock);
2425                                 if (transno == obd->obd_next_recovery_transno)
2426                                         obd->obd_next_recovery_transno++;
2427                                 else if (transno >
2428                                          obd->obd_next_recovery_transno)
2429                                         obd->obd_next_recovery_transno =
2430                                                                 transno + 1;
2431                                 spin_unlock(&obd->obd_recovery_task_lock);
2432                         } else {
2433                                 dtrq_destroy(dtrq);
2434                         }
2435                 } else {
2436                         spin_unlock(&obd->obd_recovery_task_lock);
2437 abort:
2438                         LASSERT(list_empty(&obd->obd_req_replay_queue));
2439                         LASSERT(atomic_read(&obd->obd_req_replay_clients) == 0);
2440                         /** evict exports failed VBR */
2441                         class_disconnect_stale_exports(obd, exp_vbr_healthy);
2442                         break;
2443                 }
2444         } while (1);
2445 }
2446
2447 static int target_recovery_thread(void *arg)
2448 {
2449         struct lu_target *lut = arg;
2450         struct obd_device *obd = lut->lut_obd;
2451         struct ptlrpc_request *req;
2452         struct target_recovery_data *trd = &obd->obd_recovery_data;
2453         unsigned long delta;
2454         struct lu_env *env;
2455         struct ptlrpc_thread *thread = NULL;
2456         int rc = 0;
2457         ENTRY;
2458
2459         unshare_fs_struct();
2460         OBD_ALLOC_PTR(thread);
2461         if (thread == NULL)
2462                 RETURN(-ENOMEM);
2463
2464         OBD_ALLOC_PTR(env);
2465         if (env == NULL) {
2466                 OBD_FREE_PTR(thread);
2467                 RETURN(-ENOMEM);
2468         }
2469
2470         rc = lu_context_init(&env->le_ctx, LCT_MD_THREAD | LCT_DT_THREAD);
2471         if (rc) {
2472                 OBD_FREE_PTR(thread);
2473                 OBD_FREE_PTR(env);
2474                 RETURN(rc);
2475         }
2476
2477         thread->t_env = env;
2478         thread->t_id = -1; /* force filter_iobuf_get/put to use local buffers */
2479         env->le_ctx.lc_thread = thread;
2480         tgt_io_thread_init(thread); /* init thread_big_cache for IO requests */
2481         thread->t_watchdog = NULL;
2482
2483         CDEBUG(D_HA, "%s: started recovery thread pid %d\n", obd->obd_name,
2484                current_pid());
2485         trd->trd_processing_task = current_pid();
2486
2487         spin_lock(&obd->obd_dev_lock);
2488         obd->obd_recovering = 1;
2489         spin_unlock(&obd->obd_dev_lock);
2490         complete(&trd->trd_starting);
2491
2492         /* first of all, we have to know the first transno to replay */
2493         if (target_recovery_overseer(lut, check_for_recovery_ready,
2494                                      exp_connect_healthy)) {
2495                 abort_req_replay_queue(obd);
2496                 abort_lock_replay_queue(obd);
2497                 if (lut->lut_tdtd != NULL)
2498                         dtrq_list_destroy(lut->lut_tdtd);
2499         }
2500
2501         /* next stage: replay requests or update */
2502         delta = jiffies;
2503         CDEBUG(D_INFO, "1: request replay stage - %d clients from t%llu\n",
2504                atomic_read(&obd->obd_req_replay_clients),
2505                obd->obd_next_recovery_transno);
2506         replay_request_or_update(env, lut, trd, thread);
2507
2508         /**
2509          * The second stage: replay locks
2510          */
2511         CDEBUG(D_INFO, "2: lock replay stage - %d clients\n",
2512                atomic_read(&obd->obd_lock_replay_clients));
2513         while ((req = target_next_replay_lock(lut))) {
2514                 LASSERT(trd->trd_processing_task == current_pid());
2515                 DEBUG_REQ(D_HA, req, "processing lock from %s: ",
2516                           libcfs_nid2str(req->rq_peer.nid));
2517                 handle_recovery_req(thread, req,
2518                                     trd->trd_recovery_handler);
2519                 target_request_copy_put(req);
2520                 obd->obd_replayed_locks++;
2521         }
2522
2523         /**
2524          * The third stage: reply on final pings, at this moment all clients
2525          * must have request in final queue
2526          */
2527         CFS_FAIL_TIMEOUT(OBD_FAIL_TGT_REPLAY_RECONNECT, cfs_fail_val);
2528         CDEBUG(D_INFO, "3: final stage - process recovery completion pings\n");
2529         /** Update server last boot epoch */
2530         tgt_boot_epoch_update(lut);
2531         /* We drop recoverying flag to forward all new requests
2532          * to regular mds_handle() since now */
2533         spin_lock(&obd->obd_dev_lock);
2534         obd->obd_recovering = obd->obd_abort_recovery = 0;
2535         spin_unlock(&obd->obd_dev_lock);
2536         spin_lock(&obd->obd_recovery_task_lock);
2537         target_cancel_recovery_timer(obd);
2538         spin_unlock(&obd->obd_recovery_task_lock);
2539         while ((req = target_next_final_ping(obd))) {
2540                 LASSERT(trd->trd_processing_task == current_pid());
2541                 DEBUG_REQ(D_HA, req, "processing final ping from %s: ",
2542                           libcfs_nid2str(req->rq_peer.nid));
2543                 handle_recovery_req(thread, req,
2544                                     trd->trd_recovery_handler);
2545                 /* Because the waiting client can not send ping to server,
2546                  * so we need refresh the last_request_time, to avoid the
2547                  * export is being evicted */
2548                 ptlrpc_update_export_timer(req->rq_export, 0);
2549                 target_request_copy_put(req);
2550         }
2551
2552         delta = jiffies_to_msecs(jiffies - delta) / MSEC_PER_SEC;
2553         CDEBUG(D_INFO,"4: recovery completed in %lus - %d/%d reqs/locks\n",
2554               delta, obd->obd_replayed_requests, obd->obd_replayed_locks);
2555         if (delta > OBD_RECOVERY_TIME_SOFT) {
2556                 CWARN("too long recovery - read logs\n");
2557                 libcfs_debug_dumplog();
2558         }
2559
2560         target_finish_recovery(lut);
2561
2562         lu_context_fini(&env->le_ctx);
2563         trd->trd_processing_task = 0;
2564         complete(&trd->trd_finishing);
2565
2566         tgt_io_thread_done(thread);
2567         OBD_FREE_PTR(thread);
2568         OBD_FREE_PTR(env);
2569         RETURN(rc);
2570 }
2571
2572 static int target_start_recovery_thread(struct lu_target *lut,
2573                                         svc_handler_t handler)
2574 {
2575         struct obd_device *obd = lut->lut_obd;
2576         int rc = 0;
2577         struct target_recovery_data *trd = &obd->obd_recovery_data;
2578         int index;
2579
2580         memset(trd, 0, sizeof(*trd));
2581         init_completion(&trd->trd_starting);
2582         init_completion(&trd->trd_finishing);
2583         trd->trd_recovery_handler = handler;
2584
2585         rc = server_name2index(obd->obd_name, &index, NULL);
2586         if (rc < 0)
2587                 return rc;
2588
2589         if (!IS_ERR(kthread_run(target_recovery_thread,
2590                                 lut, "tgt_recover_%d", index))) {
2591                 wait_for_completion(&trd->trd_starting);
2592                 LASSERT(obd->obd_recovering != 0);
2593         } else {
2594                 rc = -ECHILD;
2595         }
2596
2597         return rc;
2598 }
2599
2600 void target_stop_recovery_thread(struct obd_device *obd)
2601 {
2602         if (obd->obd_recovery_data.trd_processing_task > 0) {
2603                 struct target_recovery_data *trd = &obd->obd_recovery_data;
2604                 /** recovery can be done but postrecovery is not yet */
2605                 spin_lock(&obd->obd_dev_lock);
2606                 if (obd->obd_recovering) {
2607                         CERROR("%s: Aborting recovery\n", obd->obd_name);
2608                         obd->obd_abort_recovery = 1;
2609                         wake_up(&obd->obd_next_transno_waitq);
2610                 }
2611                 spin_unlock(&obd->obd_dev_lock);
2612                 wait_for_completion(&trd->trd_finishing);
2613         }
2614 }
2615 EXPORT_SYMBOL(target_stop_recovery_thread);
2616
2617 void target_recovery_fini(struct obd_device *obd)
2618 {
2619         class_disconnect_exports(obd);
2620         target_stop_recovery_thread(obd);
2621         target_cleanup_recovery(obd);
2622 }
2623 EXPORT_SYMBOL(target_recovery_fini);
2624
2625 static void target_recovery_expired(unsigned long castmeharder)
2626 {
2627         struct obd_device *obd = (struct obd_device *)castmeharder;
2628         CDEBUG(D_HA, "%s: recovery timed out; %d clients are still in recovery"
2629                " after %llus (%d clients connected)\n",
2630                obd->obd_name, atomic_read(&obd->obd_lock_replay_clients),
2631                (s64)(ktime_get_real_seconds() - obd->obd_recovery_start),
2632                atomic_read(&obd->obd_connected_clients));
2633
2634         obd->obd_recovery_expired = 1;
2635         wake_up(&obd->obd_next_transno_waitq);
2636 }
2637
2638 void target_recovery_init(struct lu_target *lut, svc_handler_t handler)
2639 {
2640         struct obd_device *obd = lut->lut_obd;
2641
2642         if (lut->lut_bottom->dd_rdonly)
2643                 return;
2644
2645         if (obd->obd_max_recoverable_clients == 0) {
2646                 /** Update server last boot epoch */
2647                 tgt_boot_epoch_update(lut);
2648                 return;
2649         }
2650
2651         CDEBUG(D_HA, "RECOVERY: service %s, %d recoverable clients, "
2652                "last_transno %llu\n", obd->obd_name,
2653                obd->obd_max_recoverable_clients, obd->obd_last_committed);
2654         LASSERT(obd->obd_stopping == 0);
2655         obd->obd_next_recovery_transno = obd->obd_last_committed + 1;
2656         obd->obd_recovery_start = 0;
2657         obd->obd_recovery_end = 0;
2658
2659         setup_timer(&obd->obd_recovery_timer, target_recovery_expired,
2660                     (unsigned long)obd);
2661         target_start_recovery_thread(lut, handler);
2662 }
2663 EXPORT_SYMBOL(target_recovery_init);
2664
2665 static int target_process_req_flags(struct obd_device *obd,
2666                                     struct ptlrpc_request *req)
2667 {
2668         struct obd_export *exp = req->rq_export;
2669         LASSERT(exp != NULL);
2670         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
2671                 /* client declares he's ready to replay locks */
2672                 spin_lock(&exp->exp_lock);
2673                 if (exp->exp_req_replay_needed) {
2674                         exp->exp_req_replay_needed = 0;
2675                         spin_unlock(&exp->exp_lock);
2676
2677                         LASSERT_ATOMIC_POS(&obd->obd_req_replay_clients);
2678                         atomic_dec(&obd->obd_req_replay_clients);
2679                 } else {
2680                         spin_unlock(&exp->exp_lock);
2681                 }
2682         }
2683         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
2684                 /* client declares he's ready to complete recovery
2685                  * so, we put the request on th final queue */
2686                 spin_lock(&exp->exp_lock);
2687                 if (exp->exp_lock_replay_needed) {
2688                         exp->exp_lock_replay_needed = 0;
2689                         spin_unlock(&exp->exp_lock);
2690
2691                         LASSERT_ATOMIC_POS(&obd->obd_lock_replay_clients);
2692                         atomic_dec(&obd->obd_lock_replay_clients);
2693                 } else {
2694                         spin_unlock(&exp->exp_lock);
2695                 }
2696         }
2697         return 0;
2698 }
2699
2700 int target_queue_recovery_request(struct ptlrpc_request *req,
2701                                   struct obd_device *obd)
2702 {
2703         __u64 transno = lustre_msg_get_transno(req->rq_reqmsg);
2704         struct ptlrpc_request *reqiter;
2705         int inserted = 0;
2706         ENTRY;
2707
2708         if (obd->obd_recovery_data.trd_processing_task == current_pid()) {
2709                 /* Processing the queue right now, don't re-add. */
2710                 RETURN(1);
2711         }
2712
2713         target_process_req_flags(obd, req);
2714
2715         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
2716                 /* client declares he's ready to complete recovery
2717                  * so, we put the request on th final queue */
2718                 target_request_copy_get(req);
2719                 DEBUG_REQ(D_HA, req, "queue final req");
2720                 wake_up(&obd->obd_next_transno_waitq);
2721                 spin_lock(&obd->obd_recovery_task_lock);
2722                 if (obd->obd_recovering) {
2723                         struct ptlrpc_request *tmp;
2724                         struct ptlrpc_request *duplicate = NULL;
2725
2726                         if (likely(!req->rq_export->exp_replay_done)) {
2727                                 req->rq_export->exp_replay_done = 1;
2728                                 list_add_tail(&req->rq_list,
2729                                               &obd->obd_final_req_queue);
2730                                 spin_unlock(&obd->obd_recovery_task_lock);
2731                                 RETURN(0);
2732                         }
2733
2734                         /* XXX O(n), but only happens if final ping is
2735                          * timed out, probably reorganize the list as
2736                          * a hash list later */
2737                         list_for_each_entry_safe(reqiter, tmp,
2738                                                  &obd->obd_final_req_queue,
2739                                                  rq_list) {
2740                                 if (reqiter->rq_export == req->rq_export) {
2741                                         list_del_init(&reqiter->rq_list);
2742                                         duplicate = reqiter;
2743                                         break;
2744                                 }
2745                         }
2746
2747                         list_add_tail(&req->rq_list,
2748                                       &obd->obd_final_req_queue);
2749                         req->rq_export->exp_replay_done = 1;
2750                         spin_unlock(&obd->obd_recovery_task_lock);
2751
2752                         if (duplicate != NULL) {
2753                                 DEBUG_REQ(D_HA, duplicate,
2754                                           "put prev final req\n");
2755                                 target_request_copy_put(duplicate);
2756                         }
2757                         RETURN(0);
2758                 } else {
2759                         spin_unlock(&obd->obd_recovery_task_lock);
2760                         target_request_copy_put(req);
2761                         RETURN(obd->obd_stopping ? -ENOTCONN : 1);
2762                 }
2763         }
2764         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
2765                 /* client declares he's ready to replay locks */
2766                 target_request_copy_get(req);
2767                 DEBUG_REQ(D_HA, req, "queue lock replay req");
2768                 wake_up(&obd->obd_next_transno_waitq);
2769                 spin_lock(&obd->obd_recovery_task_lock);
2770                 LASSERT(obd->obd_recovering);
2771                 /* usually due to recovery abort */
2772                 if (!req->rq_export->exp_in_recovery) {
2773                         spin_unlock(&obd->obd_recovery_task_lock);
2774                         target_request_copy_put(req);
2775                         RETURN(-ENOTCONN);
2776                 }
2777                 LASSERT(req->rq_export->exp_lock_replay_needed);
2778                 list_add_tail(&req->rq_list, &obd->obd_lock_replay_queue);
2779                 spin_unlock(&obd->obd_recovery_task_lock);
2780                 RETURN(0);
2781         }
2782
2783         /* CAVEAT EMPTOR: The incoming request message has been swabbed
2784          * (i.e. buflens etc are in my own byte order), but type-dependent
2785          * buffers (eg mdt_body, ost_body etc) have NOT been swabbed. */
2786
2787         if (!transno) {
2788                 INIT_LIST_HEAD(&req->rq_list);
2789                 DEBUG_REQ(D_HA, req, "not queueing");
2790                 RETURN(1);
2791         }
2792
2793         /* If we're processing the queue, we want don't want to queue this
2794          * message.
2795          *
2796          * Also, if this request has a transno less than the one we're waiting
2797          * for, we should process it now.  It could (and currently always will)
2798          * be an open request for a descriptor that was opened some time ago.
2799          *
2800          * Also, a resent, replayed request that has already been
2801          * handled will pass through here and be processed immediately.
2802          */
2803         CDEBUG(D_HA, "Next recovery transno: %llu"
2804                ", current: %llu, replaying\n",
2805                obd->obd_next_recovery_transno, transno);
2806
2807         /* If the request has been replayed by update replay, then sends this
2808          * request to the recovery thread (replay_request_or_update()), where
2809          * it will be handled */
2810         spin_lock(&obd->obd_recovery_task_lock);
2811         if (transno < obd->obd_next_recovery_transno &&
2812             !is_req_replayed_by_update(req)) {
2813                 /* Processing the queue right now, don't re-add. */
2814                 LASSERT(list_empty(&req->rq_list));
2815                 spin_unlock(&obd->obd_recovery_task_lock);
2816                 RETURN(1);
2817         }
2818         spin_unlock(&obd->obd_recovery_task_lock);
2819
2820         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_REPLAY_DROP))
2821                 RETURN(0);
2822
2823         target_request_copy_get(req);
2824         if (!req->rq_export->exp_in_recovery) {
2825                 target_request_copy_put(req);
2826                 RETURN(-ENOTCONN);
2827         }
2828         LASSERT(req->rq_export->exp_req_replay_needed);
2829
2830         if (target_exp_enqueue_req_replay(req)) {
2831                 DEBUG_REQ(D_ERROR, req, "dropping resent queued req");
2832                 target_request_copy_put(req);
2833                 RETURN(0);
2834         }
2835
2836         /* XXX O(n^2) */
2837         spin_lock(&obd->obd_recovery_task_lock);
2838         LASSERT(obd->obd_recovering);
2839         list_for_each_entry(reqiter, &obd->obd_req_replay_queue, rq_list) {
2840                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) > transno) {
2841                         list_add_tail(&req->rq_list, &reqiter->rq_list);
2842                         inserted = 1;
2843                         goto added;
2844                 }
2845
2846                 if (unlikely(lustre_msg_get_transno(reqiter->rq_reqmsg) ==
2847                              transno)) {
2848                         DEBUG_REQ(D_ERROR, req, "dropping replay: transno "
2849                                   "has been claimed by another client");
2850                         spin_unlock(&obd->obd_recovery_task_lock);
2851                         target_exp_dequeue_req_replay(req);
2852                         target_request_copy_put(req);
2853                         RETURN(0);
2854                 }
2855         }
2856 added:
2857         if (!inserted)
2858                 list_add_tail(&req->rq_list, &obd->obd_req_replay_queue);
2859
2860         obd->obd_requests_queued_for_recovery++;
2861         spin_unlock(&obd->obd_recovery_task_lock);
2862         wake_up(&obd->obd_next_transno_waitq);
2863         RETURN(0);
2864 }
2865
2866 int target_handle_ping(struct ptlrpc_request *req)
2867 {
2868         obd_ping(req->rq_svc_thread->t_env, req->rq_export);
2869         return req_capsule_server_pack(&req->rq_pill);
2870 }
2871
2872 void target_committed_to_req(struct ptlrpc_request *req)
2873 {
2874         struct obd_export *exp = req->rq_export;
2875
2876         if (!exp->exp_obd->obd_no_transno && req->rq_repmsg != NULL)
2877                 lustre_msg_set_last_committed(req->rq_repmsg,
2878                                               exp->exp_last_committed);
2879         else
2880                 DEBUG_REQ(D_IOCTL, req, "not sending last_committed update (%d/"
2881                           "%d)", exp->exp_obd->obd_no_transno,
2882                           req->rq_repmsg == NULL);
2883
2884         CDEBUG(D_INFO, "last_committed %llu, transno %llu, xid %llu\n",
2885                exp->exp_last_committed, req->rq_transno, req->rq_xid);
2886 }
2887
2888 #endif /* HAVE_SERVER_SUPPORT */
2889
2890 /**
2891  * Packs current SLV and Limit into \a req.
2892  */
2893 int target_pack_pool_reply(struct ptlrpc_request *req)
2894 {
2895         struct obd_device *obd;
2896         ENTRY;
2897
2898         /* Check that we still have all structures alive as this may
2899          * be some late RPC at shutdown time. */
2900         if (unlikely(!req->rq_export || !req->rq_export->exp_obd ||
2901                      !exp_connect_lru_resize(req->rq_export))) {
2902                 lustre_msg_set_slv(req->rq_repmsg, 0);
2903                 lustre_msg_set_limit(req->rq_repmsg, 0);
2904                 RETURN(0);
2905         }
2906
2907         /* OBD is alive here as export is alive, which we checked above. */
2908         obd = req->rq_export->exp_obd;
2909
2910         read_lock(&obd->obd_pool_lock);
2911         lustre_msg_set_slv(req->rq_repmsg, obd->obd_pool_slv);
2912         lustre_msg_set_limit(req->rq_repmsg, obd->obd_pool_limit);
2913         read_unlock(&obd->obd_pool_lock);
2914
2915         RETURN(0);
2916 }
2917
2918 static int target_send_reply_msg(struct ptlrpc_request *req,
2919                                  int rc, int fail_id)
2920 {
2921         if (OBD_FAIL_CHECK_ORSET(fail_id & ~OBD_FAIL_ONCE, OBD_FAIL_ONCE)) {
2922                 DEBUG_REQ(D_ERROR, req, "dropping reply");
2923                 return -ECOMM;
2924         }
2925         /* We can have a null rq_reqmsg in the event of bad signature or
2926          * no context when unwrapping */
2927         if (req->rq_reqmsg &&
2928             unlikely(lustre_msg_get_opc(req->rq_reqmsg) == MDS_REINT &&
2929             OBD_FAIL_CHECK(OBD_FAIL_MDS_REINT_MULTI_NET_REP)))
2930                 return -ECOMM;
2931
2932         if (unlikely(rc)) {
2933                 DEBUG_REQ(D_NET, req, "processing error (%d)", rc);
2934                 req->rq_status = rc;
2935                 return ptlrpc_send_error(req, 1);
2936         } else {
2937                 DEBUG_REQ(D_NET, req, "sending reply");
2938         }
2939
2940         return ptlrpc_send_reply(req, PTLRPC_REPLY_MAYBE_DIFFICULT);
2941 }
2942
2943 void target_send_reply(struct ptlrpc_request *req, int rc, int fail_id)
2944 {
2945         struct ptlrpc_service_part *svcpt;
2946         int                        netrc;
2947         struct ptlrpc_reply_state *rs;
2948         struct obd_export         *exp;
2949         ENTRY;
2950
2951         if (req->rq_no_reply) {
2952                 EXIT;
2953                 return;
2954         }
2955
2956         svcpt = req->rq_rqbd->rqbd_svcpt;
2957         rs = req->rq_reply_state;
2958         if (rs == NULL || !rs->rs_difficult) {
2959                 /* no notifiers */
2960                 target_send_reply_msg (req, rc, fail_id);
2961                 EXIT;
2962                 return;
2963         }
2964
2965         /* must be an export if locks saved */
2966         LASSERT(req->rq_export != NULL);
2967         /* req/reply consistent */
2968         LASSERT(rs->rs_svcpt == svcpt);
2969
2970         /* "fresh" reply */
2971         LASSERT(!rs->rs_scheduled);
2972         LASSERT(!rs->rs_scheduled_ever);
2973         LASSERT(!rs->rs_handled);
2974         LASSERT(!rs->rs_on_net);
2975         LASSERT(rs->rs_export == NULL);
2976         LASSERT(list_empty(&rs->rs_obd_list));
2977         LASSERT(list_empty(&rs->rs_exp_list));
2978
2979         exp = class_export_get(req->rq_export);
2980
2981         /* disable reply scheduling while I'm setting up */
2982         rs->rs_scheduled = 1;
2983         rs->rs_on_net    = 1;
2984         rs->rs_xid       = req->rq_xid;
2985         rs->rs_transno   = req->rq_transno;
2986         rs->rs_export    = exp;
2987         rs->rs_opc       = lustre_msg_get_opc(req->rq_reqmsg);
2988
2989         spin_lock(&exp->exp_uncommitted_replies_lock);
2990         CDEBUG(D_NET, "rs transno = %llu, last committed = %llu\n",
2991                rs->rs_transno, exp->exp_last_committed);
2992         if (rs->rs_transno > exp->exp_last_committed) {
2993                 /* not committed already */
2994                 list_add_tail(&rs->rs_obd_list,
2995                                   &exp->exp_uncommitted_replies);
2996         }
2997         spin_unlock(&exp->exp_uncommitted_replies_lock);
2998
2999         spin_lock(&exp->exp_lock);
3000         list_add_tail(&rs->rs_exp_list, &exp->exp_outstanding_replies);
3001         spin_unlock(&exp->exp_lock);
3002
3003         netrc = target_send_reply_msg(req, rc, fail_id);
3004
3005         spin_lock(&svcpt->scp_rep_lock);
3006
3007         atomic_inc(&svcpt->scp_nreps_difficult);
3008
3009         if (netrc != 0) {
3010                 /* error sending: reply is off the net.  Also we need +1
3011                  * reply ref until ptlrpc_handle_rs() is done
3012                  * with the reply state (if the send was successful, there
3013                  * would have been +1 ref for the net, which
3014                  * reply_out_callback leaves alone) */
3015                 rs->rs_on_net = 0;
3016                 ptlrpc_rs_addref(rs);
3017         }
3018
3019         spin_lock(&rs->rs_lock);
3020         if (rs->rs_transno <= exp->exp_last_committed ||
3021             (!rs->rs_on_net && !rs->rs_no_ack) ||
3022             list_empty(&rs->rs_exp_list) ||     /* completed already */
3023             list_empty(&rs->rs_obd_list)) {
3024                 CDEBUG(D_HA, "Schedule reply immediately\n");
3025                 ptlrpc_dispatch_difficult_reply(rs);
3026         } else {
3027                 list_add(&rs->rs_list, &svcpt->scp_rep_active);
3028                 rs->rs_scheduled = 0;   /* allow notifier to schedule */
3029         }
3030         spin_unlock(&rs->rs_lock);
3031         spin_unlock(&svcpt->scp_rep_lock);
3032         EXIT;
3033 }
3034
3035 enum ldlm_mode lck_compat_array[] = {
3036         [LCK_EX]    = LCK_COMPAT_EX,
3037         [LCK_PW]    = LCK_COMPAT_PW,
3038         [LCK_PR]    = LCK_COMPAT_PR,
3039         [LCK_CW]    = LCK_COMPAT_CW,
3040         [LCK_CR]    = LCK_COMPAT_CR,
3041         [LCK_NL]    = LCK_COMPAT_NL,
3042         [LCK_GROUP] = LCK_COMPAT_GROUP,
3043         [LCK_COS]   = LCK_COMPAT_COS,
3044 };
3045
3046 /**
3047  * Rather arbitrary mapping from LDLM error codes to errno values. This should
3048  * not escape to the user level.
3049  */
3050 int ldlm_error2errno(enum ldlm_error error)
3051 {
3052         int result;
3053
3054         switch (error) {
3055         case ELDLM_OK:
3056         case ELDLM_LOCK_MATCHED:
3057                 result = 0;
3058                 break;
3059         case ELDLM_LOCK_CHANGED:
3060                 result = -ESTALE;
3061                 break;
3062         case ELDLM_LOCK_ABORTED:
3063                 result = -ENAVAIL;
3064                 break;
3065         case ELDLM_LOCK_REPLACED:
3066                 result = -ESRCH;
3067                 break;
3068         case ELDLM_NO_LOCK_DATA:
3069                 result = -ENOENT;
3070                 break;
3071         case ELDLM_NAMESPACE_EXISTS:
3072                 result = -EEXIST;
3073                 break;
3074         case ELDLM_BAD_NAMESPACE:
3075                 result = -EBADF;
3076                 break;
3077         default:
3078                 if (((int)error) < 0) { /* cast to signed type */
3079                         result = error; /* as ldlm_error can be unsigned */
3080                 } else {
3081                         CERROR("Invalid DLM result code: %d\n", error);
3082                         result = -EPROTO;
3083                 }
3084         }
3085         return result;
3086 }
3087 EXPORT_SYMBOL(ldlm_error2errno);
3088
3089 /**
3090  * Dual to ldlm_error2errno(): maps errno values back to enum ldlm_error.
3091  */
3092 enum ldlm_error ldlm_errno2error(int err_no)
3093 {
3094         int error;
3095
3096         switch (err_no) {
3097         case 0:
3098                 error = ELDLM_OK;
3099                 break;
3100         case -ESTALE:
3101                 error = ELDLM_LOCK_CHANGED;
3102                 break;
3103         case -ENAVAIL:
3104                 error = ELDLM_LOCK_ABORTED;
3105                 break;
3106         case -ESRCH:
3107                 error = ELDLM_LOCK_REPLACED;
3108                 break;
3109         case -ENOENT:
3110                 error = ELDLM_NO_LOCK_DATA;
3111                 break;
3112         case -EEXIST:
3113                 error = ELDLM_NAMESPACE_EXISTS;
3114                 break;
3115         case -EBADF:
3116                 error = ELDLM_BAD_NAMESPACE;
3117                 break;
3118         default:
3119                 error = err_no;
3120         }
3121         return error;
3122 }
3123
3124 #if LUSTRE_TRACKS_LOCK_EXP_REFS
3125 void ldlm_dump_export_locks(struct obd_export *exp)
3126 {
3127         spin_lock(&exp->exp_locks_list_guard);
3128         if (!list_empty(&exp->exp_locks_list)) {
3129                 struct ldlm_lock *lock;
3130
3131                 CERROR("dumping locks for export %p,"
3132                        "ignore if the unmount doesn't hang\n", exp);
3133                 list_for_each_entry(lock, &exp->exp_locks_list,
3134                                         l_exp_refs_link)
3135                         LDLM_ERROR(lock, "lock:");
3136         }
3137         spin_unlock(&exp->exp_locks_list_guard);
3138 }
3139 #endif
3140
3141 #ifdef HAVE_SERVER_SUPPORT
3142 static int target_bulk_timeout(void *data)
3143 {
3144         ENTRY;
3145         /* We don't fail the connection here, because having the export
3146          * killed makes the (vital) call to commitrw very sad.
3147          */
3148         RETURN(1);
3149 }
3150
3151 static inline const char *bulk2type(struct ptlrpc_request *req)
3152 {
3153         if (req->rq_bulk_read)
3154                 return "READ";
3155         if (req->rq_bulk_write)
3156                 return "WRITE";
3157         return "UNKNOWN";
3158 }
3159
3160 int target_bulk_io(struct obd_export *exp, struct ptlrpc_bulk_desc *desc,
3161                    struct l_wait_info *lwi)
3162 {
3163         struct ptlrpc_request   *req = desc->bd_req;
3164         time_t                   start = cfs_time_current_sec();
3165         time_t                   deadline;