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b=23289 grained lock for ptlrpc service
[fs/lustre-release.git] / lustre / ldlm / ldlm_lib.c
1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2  * vim:expandtab:shiftwidth=8:tabstop=8:
3  *
4  * GPL HEADER START
5  *
6  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License version 2 only,
10  * as published by the Free Software Foundation.
11  *
12  * This program is distributed in the hope that it will be useful, but
13  * WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15  * General Public License version 2 for more details (a copy is included
16  * in the LICENSE file that accompanied this code).
17  *
18  * You should have received a copy of the GNU General Public License
19  * version 2 along with this program; If not, see
20  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
21  *
22  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
23  * CA 95054 USA or visit www.sun.com if you need additional information or
24  * have any questions.
25  *
26  * GPL HEADER END
27  */
28 /*
29  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
30  * Use is subject to license terms.
31  */
32 /*
33  * This file is part of Lustre, http://www.lustre.org/
34  * Lustre is a trademark of Sun Microsystems, Inc.
35  */
36
37 #ifndef EXPORT_SYMTAB
38 # define EXPORT_SYMTAB
39 #endif
40 #define DEBUG_SUBSYSTEM S_LDLM
41
42 #ifdef __KERNEL__
43 # include <libcfs/libcfs.h>
44 #else
45 # include <liblustre.h>
46 #endif
47 #include <obd.h>
48 #include <lustre_mds.h>
49 #include <lustre_dlm.h>
50 #include <lustre_net.h>
51 #include <lustre_sec.h>
52 #include "ldlm_internal.h"
53
54 /* @priority: if non-zero, move the selected to the list head
55  * @create: if zero, only search in existed connections
56  */
57 static int import_set_conn(struct obd_import *imp, struct obd_uuid *uuid,
58                            int priority, int create)
59 {
60         struct ptlrpc_connection *ptlrpc_conn;
61         struct obd_import_conn *imp_conn = NULL, *item;
62         int rc = 0;
63         ENTRY;
64
65         if (!create && !priority) {
66                 CDEBUG(D_HA, "Nothing to do\n");
67                 RETURN(-EINVAL);
68         }
69
70         ptlrpc_conn = ptlrpc_uuid_to_connection(uuid);
71         if (!ptlrpc_conn) {
72                 CDEBUG(D_HA, "can't find connection %s\n", uuid->uuid);
73                 RETURN (-ENOENT);
74         }
75
76         if (create) {
77                 OBD_ALLOC(imp_conn, sizeof(*imp_conn));
78                 if (!imp_conn) {
79                         GOTO(out_put, rc = -ENOMEM);
80                 }
81         }
82
83         cfs_spin_lock(&imp->imp_lock);
84         cfs_list_for_each_entry(item, &imp->imp_conn_list, oic_item) {
85                 if (obd_uuid_equals(uuid, &item->oic_uuid)) {
86                         if (priority) {
87                                 cfs_list_del(&item->oic_item);
88                                 cfs_list_add(&item->oic_item,
89                                              &imp->imp_conn_list);
90                                 item->oic_last_attempt = 0;
91                         }
92                         CDEBUG(D_HA, "imp %p@%s: found existing conn %s%s\n",
93                                imp, imp->imp_obd->obd_name, uuid->uuid,
94                                (priority ? ", moved to head" : ""));
95                         cfs_spin_unlock(&imp->imp_lock);
96                         GOTO(out_free, rc = 0);
97                 }
98         }
99         /* not found */
100         if (create) {
101                 imp_conn->oic_conn = ptlrpc_conn;
102                 imp_conn->oic_uuid = *uuid;
103                 imp_conn->oic_last_attempt = 0;
104                 if (priority)
105                         cfs_list_add(&imp_conn->oic_item, &imp->imp_conn_list);
106                 else
107                         cfs_list_add_tail(&imp_conn->oic_item,
108                                           &imp->imp_conn_list);
109                 CDEBUG(D_HA, "imp %p@%s: add connection %s at %s\n",
110                        imp, imp->imp_obd->obd_name, uuid->uuid,
111                        (priority ? "head" : "tail"));
112         } else {
113                 cfs_spin_unlock(&imp->imp_lock);
114                 GOTO(out_free, rc = -ENOENT);
115         }
116
117         cfs_spin_unlock(&imp->imp_lock);
118         RETURN(0);
119 out_free:
120         if (imp_conn)
121                 OBD_FREE(imp_conn, sizeof(*imp_conn));
122 out_put:
123         ptlrpc_connection_put(ptlrpc_conn);
124         RETURN(rc);
125 }
126
127 int import_set_conn_priority(struct obd_import *imp, struct obd_uuid *uuid)
128 {
129         return import_set_conn(imp, uuid, 1, 0);
130 }
131
132 int client_import_add_conn(struct obd_import *imp, struct obd_uuid *uuid,
133                            int priority)
134 {
135         return import_set_conn(imp, uuid, priority, 1);
136 }
137
138 int client_import_del_conn(struct obd_import *imp, struct obd_uuid *uuid)
139 {
140         struct obd_import_conn *imp_conn;
141         struct obd_export *dlmexp;
142         int rc = -ENOENT;
143         ENTRY;
144
145         cfs_spin_lock(&imp->imp_lock);
146         if (cfs_list_empty(&imp->imp_conn_list)) {
147                 LASSERT(!imp->imp_connection);
148                 GOTO(out, rc);
149         }
150
151         cfs_list_for_each_entry(imp_conn, &imp->imp_conn_list, oic_item) {
152                 if (!obd_uuid_equals(uuid, &imp_conn->oic_uuid))
153                         continue;
154                 LASSERT(imp_conn->oic_conn);
155
156                 /* is current conn? */
157                 if (imp_conn == imp->imp_conn_current) {
158                         LASSERT(imp_conn->oic_conn == imp->imp_connection);
159
160                         if (imp->imp_state != LUSTRE_IMP_CLOSED &&
161                             imp->imp_state != LUSTRE_IMP_DISCON) {
162                                 CERROR("can't remove current connection\n");
163                                 GOTO(out, rc = -EBUSY);
164                         }
165
166                         ptlrpc_connection_put(imp->imp_connection);
167                         imp->imp_connection = NULL;
168
169                         dlmexp = class_conn2export(&imp->imp_dlm_handle);
170                         if (dlmexp && dlmexp->exp_connection) {
171                                 LASSERT(dlmexp->exp_connection ==
172                                         imp_conn->oic_conn);
173                                 ptlrpc_connection_put(dlmexp->exp_connection);
174                                 dlmexp->exp_connection = NULL;
175                         }
176                 }
177
178                 cfs_list_del(&imp_conn->oic_item);
179                 ptlrpc_connection_put(imp_conn->oic_conn);
180                 OBD_FREE(imp_conn, sizeof(*imp_conn));
181                 CDEBUG(D_HA, "imp %p@%s: remove connection %s\n",
182                        imp, imp->imp_obd->obd_name, uuid->uuid);
183                 rc = 0;
184                 break;
185         }
186 out:
187         cfs_spin_unlock(&imp->imp_lock);
188         if (rc == -ENOENT)
189                 CERROR("connection %s not found\n", uuid->uuid);
190         RETURN(rc);
191 }
192
193 void client_destroy_import(struct obd_import *imp)
194 {
195         /* drop security policy instance after all rpc finished/aborted
196          * to let all busy contexts be released. */
197         class_import_get(imp);
198         class_destroy_import(imp);
199         sptlrpc_import_sec_put(imp);
200         class_import_put(imp);
201 }
202
203 /* configure an RPC client OBD device
204  *
205  * lcfg parameters:
206  * 1 - client UUID
207  * 2 - server UUID
208  * 3 - inactive-on-startup
209  */
210 int client_obd_setup(struct obd_device *obddev, struct lustre_cfg *lcfg)
211 {
212         struct client_obd *cli = &obddev->u.cli;
213         struct obd_import *imp;
214         struct obd_uuid server_uuid;
215         int rq_portal, rp_portal, connect_op;
216         char *name = obddev->obd_type->typ_name;
217         int rc;
218         ENTRY;
219
220         /* In a more perfect world, we would hang a ptlrpc_client off of
221          * obd_type and just use the values from there. */
222         if (!strcmp(name, LUSTRE_OSC_NAME)) {
223                 rq_portal = OST_REQUEST_PORTAL;
224                 rp_portal = OSC_REPLY_PORTAL;
225                 connect_op = OST_CONNECT;
226                 cli->cl_sp_me = LUSTRE_SP_CLI;
227                 cli->cl_sp_to = LUSTRE_SP_OST;
228         } else if (!strcmp(name, LUSTRE_MDC_NAME)) {
229                 rq_portal = MDS_REQUEST_PORTAL;
230                 rp_portal = MDC_REPLY_PORTAL;
231                 connect_op = MDS_CONNECT;
232                 cli->cl_sp_me = LUSTRE_SP_CLI;
233                 cli->cl_sp_to = LUSTRE_SP_MDT;
234         } else if (!strcmp(name, LUSTRE_MGC_NAME)) {
235                 rq_portal = MGS_REQUEST_PORTAL;
236                 rp_portal = MGC_REPLY_PORTAL;
237                 connect_op = MGS_CONNECT;
238                 cli->cl_sp_me = LUSTRE_SP_MGC;
239                 cli->cl_sp_to = LUSTRE_SP_MGS;
240                 cli->cl_flvr_mgc.sf_rpc = SPTLRPC_FLVR_INVALID;
241         } else {
242                 CERROR("unknown client OBD type \"%s\", can't setup\n",
243                        name);
244                 RETURN(-EINVAL);
245         }
246
247         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
248                 CERROR("requires a TARGET UUID\n");
249                 RETURN(-EINVAL);
250         }
251
252         if (LUSTRE_CFG_BUFLEN(lcfg, 1) > 37) {
253                 CERROR("client UUID must be less than 38 characters\n");
254                 RETURN(-EINVAL);
255         }
256
257         if (LUSTRE_CFG_BUFLEN(lcfg, 2) < 1) {
258                 CERROR("setup requires a SERVER UUID\n");
259                 RETURN(-EINVAL);
260         }
261
262         if (LUSTRE_CFG_BUFLEN(lcfg, 2) > 37) {
263                 CERROR("target UUID must be less than 38 characters\n");
264                 RETURN(-EINVAL);
265         }
266
267         cfs_init_rwsem(&cli->cl_sem);
268         cfs_sema_init(&cli->cl_mgc_sem, 1);
269         cli->cl_conn_count = 0;
270         memcpy(server_uuid.uuid, lustre_cfg_buf(lcfg, 2),
271                min_t(unsigned int, LUSTRE_CFG_BUFLEN(lcfg, 2),
272                      sizeof(server_uuid)));
273
274         cli->cl_dirty = 0;
275         cli->cl_avail_grant = 0;
276         /* FIXME: should limit this for the sum of all cl_dirty_max */
277         cli->cl_dirty_max = OSC_MAX_DIRTY_DEFAULT * 1024 * 1024;
278         if (cli->cl_dirty_max >> CFS_PAGE_SHIFT > cfs_num_physpages / 8)
279                 cli->cl_dirty_max = cfs_num_physpages << (CFS_PAGE_SHIFT - 3);
280         CFS_INIT_LIST_HEAD(&cli->cl_cache_waiters);
281         CFS_INIT_LIST_HEAD(&cli->cl_loi_ready_list);
282         CFS_INIT_LIST_HEAD(&cli->cl_loi_hp_ready_list);
283         CFS_INIT_LIST_HEAD(&cli->cl_loi_write_list);
284         CFS_INIT_LIST_HEAD(&cli->cl_loi_read_list);
285         client_obd_list_lock_init(&cli->cl_loi_list_lock);
286         cli->cl_r_in_flight = 0;
287         cli->cl_w_in_flight = 0;
288
289         cfs_spin_lock_init(&cli->cl_read_rpc_hist.oh_lock);
290         cfs_spin_lock_init(&cli->cl_write_rpc_hist.oh_lock);
291         cfs_spin_lock_init(&cli->cl_read_page_hist.oh_lock);
292         cfs_spin_lock_init(&cli->cl_write_page_hist.oh_lock);
293         cfs_spin_lock_init(&cli->cl_read_offset_hist.oh_lock);
294         cfs_spin_lock_init(&cli->cl_write_offset_hist.oh_lock);
295         cfs_waitq_init(&cli->cl_destroy_waitq);
296         cfs_atomic_set(&cli->cl_destroy_in_flight, 0);
297 #ifdef ENABLE_CHECKSUM
298         /* Turn on checksumming by default. */
299         cli->cl_checksum = 1;
300         /*
301          * The supported checksum types will be worked out at connect time
302          * Set cl_chksum* to CRC32 for now to avoid returning screwed info
303          * through procfs.
304          */
305         cli->cl_cksum_type = cli->cl_supp_cksum_types = OBD_CKSUM_CRC32;
306 #endif
307         cfs_atomic_set(&cli->cl_resends, OSC_DEFAULT_RESENDS);
308
309         /* This value may be changed at connect time in
310            ptlrpc_connect_interpret. */
311         cli->cl_max_pages_per_rpc = min((int)PTLRPC_MAX_BRW_PAGES,
312                                         (int)(1024 * 1024 >> CFS_PAGE_SHIFT));
313
314         if (!strcmp(name, LUSTRE_MDC_NAME)) {
315                 cli->cl_max_rpcs_in_flight = MDC_MAX_RIF_DEFAULT;
316         } else if (cfs_num_physpages >> (20 - CFS_PAGE_SHIFT) <= 128 /* MB */) {
317                 cli->cl_max_rpcs_in_flight = 2;
318         } else if (cfs_num_physpages >> (20 - CFS_PAGE_SHIFT) <= 256 /* MB */) {
319                 cli->cl_max_rpcs_in_flight = 3;
320         } else if (cfs_num_physpages >> (20 - CFS_PAGE_SHIFT) <= 512 /* MB */) {
321                 cli->cl_max_rpcs_in_flight = 4;
322         } else {
323                 cli->cl_max_rpcs_in_flight = OSC_MAX_RIF_DEFAULT;
324         }
325
326         rc = ldlm_get_ref();
327         if (rc) {
328                 CERROR("ldlm_get_ref failed: %d\n", rc);
329                 GOTO(err, rc);
330         }
331
332         ptlrpc_init_client(rq_portal, rp_portal, name,
333                            &obddev->obd_ldlm_client);
334
335         imp = class_new_import(obddev);
336         if (imp == NULL)
337                 GOTO(err_ldlm, rc = -ENOENT);
338         imp->imp_client = &obddev->obd_ldlm_client;
339         imp->imp_connect_op = connect_op;
340         CFS_INIT_LIST_HEAD(&imp->imp_pinger_chain);
341         memcpy(cli->cl_target_uuid.uuid, lustre_cfg_buf(lcfg, 1),
342                LUSTRE_CFG_BUFLEN(lcfg, 1));
343         class_import_put(imp);
344
345         rc = client_import_add_conn(imp, &server_uuid, 1);
346         if (rc) {
347                 CERROR("can't add initial connection\n");
348                 GOTO(err_import, rc);
349         }
350
351         cli->cl_import = imp;
352         /* cli->cl_max_mds_{easize,cookiesize} updated by mdc_init_ea_size() */
353         cli->cl_max_mds_easize = sizeof(struct lov_mds_md_v3);
354         cli->cl_max_mds_cookiesize = sizeof(struct llog_cookie);
355
356         if (LUSTRE_CFG_BUFLEN(lcfg, 3) > 0) {
357                 if (!strcmp(lustre_cfg_string(lcfg, 3), "inactive")) {
358                         CDEBUG(D_HA, "marking %s %s->%s as inactive\n",
359                                name, obddev->obd_name,
360                                cli->cl_target_uuid.uuid);
361                         cfs_spin_lock(&imp->imp_lock);
362                         imp->imp_deactive = 1;
363                         cfs_spin_unlock(&imp->imp_lock);
364                 }
365         }
366
367         obddev->obd_namespace = ldlm_namespace_new(obddev, obddev->obd_name,
368                                                    LDLM_NAMESPACE_CLIENT,
369                                                    LDLM_NAMESPACE_GREEDY);
370         if (obddev->obd_namespace == NULL) {
371                 CERROR("Unable to create client namespace - %s\n",
372                        obddev->obd_name);
373                 GOTO(err_import, rc = -ENOMEM);
374         }
375
376         cli->cl_qchk_stat = CL_NOT_QUOTACHECKED;
377
378         RETURN(rc);
379
380 err_import:
381         class_destroy_import(imp);
382 err_ldlm:
383         ldlm_put_ref();
384 err:
385         RETURN(rc);
386
387 }
388
389 int client_obd_cleanup(struct obd_device *obddev)
390 {
391         ENTRY;
392
393         ldlm_namespace_free_post(obddev->obd_namespace);
394         obddev->obd_namespace = NULL;
395
396         ldlm_put_ref();
397         RETURN(0);
398 }
399
400 /* ->o_connect() method for client side (OSC and MDC and MGC) */
401 int client_connect_import(const struct lu_env *env,
402                           struct obd_export **exp,
403                           struct obd_device *obd, struct obd_uuid *cluuid,
404                           struct obd_connect_data *data, void *localdata)
405 {
406         struct client_obd *cli = &obd->u.cli;
407         struct obd_import *imp = cli->cl_import;
408         struct obd_connect_data *ocd;
409         struct lustre_handle conn = { 0 };
410         int rc;
411         ENTRY;
412
413         *exp = NULL;
414         cfs_down_write(&cli->cl_sem);
415         if (cli->cl_conn_count > 0 )
416                 GOTO(out_sem, rc = -EALREADY);
417
418         rc = class_connect(&conn, obd, cluuid);
419         if (rc)
420                 GOTO(out_sem, rc);
421
422         cli->cl_conn_count++;
423         *exp = class_conn2export(&conn);
424
425         LASSERT(obd->obd_namespace);
426
427         imp->imp_dlm_handle = conn;
428         rc = ptlrpc_init_import(imp);
429         if (rc != 0)
430                 GOTO(out_ldlm, rc);
431
432         ocd = &imp->imp_connect_data;
433         if (data) {
434                 *ocd = *data;
435                 imp->imp_connect_flags_orig = data->ocd_connect_flags;
436         }
437
438         rc = ptlrpc_connect_import(imp, NULL);
439         if (rc != 0) {
440                 LASSERT (imp->imp_state == LUSTRE_IMP_DISCON);
441                 GOTO(out_ldlm, rc);
442         }
443         LASSERT((*exp)->exp_connection);
444
445         if (data) {
446                 LASSERTF((ocd->ocd_connect_flags & data->ocd_connect_flags) ==
447                          ocd->ocd_connect_flags, "old "LPX64", new "LPX64"\n",
448                          data->ocd_connect_flags, ocd->ocd_connect_flags);
449                 data->ocd_connect_flags = ocd->ocd_connect_flags;
450         }
451
452         ptlrpc_pinger_add_import(imp);
453
454         EXIT;
455
456         if (rc) {
457 out_ldlm:
458                 cli->cl_conn_count--;
459                 class_disconnect(*exp);
460                 *exp = NULL;
461         }
462 out_sem:
463         cfs_up_write(&cli->cl_sem);
464
465         return rc;
466 }
467
468 int client_disconnect_export(struct obd_export *exp)
469 {
470         struct obd_device *obd = class_exp2obd(exp);
471         struct client_obd *cli;
472         struct obd_import *imp;
473         int rc = 0, err;
474         ENTRY;
475
476         if (!obd) {
477                 CERROR("invalid export for disconnect: exp %p cookie "LPX64"\n",
478                        exp, exp ? exp->exp_handle.h_cookie : -1);
479                 RETURN(-EINVAL);
480         }
481
482         cli = &obd->u.cli;
483         imp = cli->cl_import;
484
485         cfs_down_write(&cli->cl_sem);
486         CDEBUG(D_INFO, "disconnect %s - %d\n", obd->obd_name,
487                cli->cl_conn_count);
488
489         if (!cli->cl_conn_count) {
490                 CERROR("disconnecting disconnected device (%s)\n",
491                        obd->obd_name);
492                 GOTO(out_disconnect, rc = -EINVAL);
493         }
494
495         cli->cl_conn_count--;
496         if (cli->cl_conn_count)
497                 GOTO(out_disconnect, rc = 0);
498
499         /* Mark import deactivated now, so we don't try to reconnect if any
500          * of the cleanup RPCs fails (e.g. ldlm cancel, etc).  We don't
501          * fully deactivate the import, or that would drop all requests. */
502         cfs_spin_lock(&imp->imp_lock);
503         imp->imp_deactive = 1;
504         cfs_spin_unlock(&imp->imp_lock);
505
506         /* Some non-replayable imports (MDS's OSCs) are pinged, so just
507          * delete it regardless.  (It's safe to delete an import that was
508          * never added.) */
509         (void)ptlrpc_pinger_del_import(imp);
510
511         if (obd->obd_namespace != NULL) {
512                 /* obd_force == local only */
513                 ldlm_cli_cancel_unused(obd->obd_namespace, NULL,
514                                        obd->obd_force ? LCF_LOCAL : 0, NULL);
515                 ldlm_namespace_free_prior(obd->obd_namespace, imp, obd->obd_force);
516         }
517
518         /*
519          * there's no need to hold sem during disconnecting an import,
520          * and actually it may cause deadlock in gss.
521          */
522         cfs_up_write(&cli->cl_sem);
523         rc = ptlrpc_disconnect_import(imp, 0);
524         cfs_down_write(&cli->cl_sem);
525
526         ptlrpc_invalidate_import(imp);
527
528         if (imp->imp_rq_pool) {
529                 ptlrpc_free_rq_pool(imp->imp_rq_pool);
530                 imp->imp_rq_pool = NULL;
531         }
532         client_destroy_import(imp);
533         cli->cl_import = NULL;
534
535         EXIT;
536
537  out_disconnect:
538         /* use server style - class_disconnect should be always called for
539          * o_disconnect */
540         err = class_disconnect(exp);
541         if (!rc && err)
542                 rc = err;
543
544         cfs_up_write(&cli->cl_sem);
545
546         RETURN(rc);
547 }
548
549 int server_disconnect_export(struct obd_export *exp)
550 {
551         int rc;
552         ENTRY;
553
554         /* Disconnect early so that clients can't keep using export */
555         rc = class_disconnect(exp);
556         /* close import for avoid sending any requests */
557         if (exp->exp_imp_reverse)
558                 ptlrpc_cleanup_imp(exp->exp_imp_reverse);
559
560         if (exp->exp_obd->obd_namespace != NULL)
561                 ldlm_cancel_locks_for_export(exp);
562
563         /* complete all outstanding replies */
564         cfs_spin_lock(&exp->exp_lock);
565         while (!cfs_list_empty(&exp->exp_outstanding_replies)) {
566                 struct ptlrpc_reply_state *rs =
567                         cfs_list_entry(exp->exp_outstanding_replies.next,
568                                        struct ptlrpc_reply_state, rs_exp_list);
569                 struct ptlrpc_service *svc = rs->rs_service;
570
571                 cfs_spin_lock(&svc->srv_rs_lock);
572                 cfs_list_del_init(&rs->rs_exp_list);
573                 cfs_spin_lock(&rs->rs_lock);
574                 ptlrpc_schedule_difficult_reply(rs);
575                 cfs_spin_unlock(&rs->rs_lock);
576                 cfs_spin_unlock(&svc->srv_rs_lock);
577         }
578         cfs_spin_unlock(&exp->exp_lock);
579
580         RETURN(rc);
581 }
582
583 /* --------------------------------------------------------------------------
584  * from old lib/target.c
585  * -------------------------------------------------------------------------- */
586
587 static int target_handle_reconnect(struct lustre_handle *conn,
588                                    struct obd_export *exp,
589                                    struct obd_uuid *cluuid)
590 {
591         ENTRY;
592         if (exp->exp_connection && exp->exp_imp_reverse) {
593                 struct lustre_handle *hdl;
594                 hdl = &exp->exp_imp_reverse->imp_remote_handle;
595                 /* Might be a re-connect after a partition. */
596                 if (!memcmp(&conn->cookie, &hdl->cookie, sizeof conn->cookie)) {
597                         CWARN("%s: %s reconnecting\n", exp->exp_obd->obd_name,
598                               cluuid->uuid);
599                         conn->cookie = exp->exp_handle.h_cookie;
600                         /* target_handle_connect() treats EALREADY and
601                          * -EALREADY differently.  EALREADY means we are
602                          * doing a valid reconnect from the same client. */
603                         RETURN(EALREADY);
604                 } else {
605                         CERROR("%s reconnecting from %s, "
606                                "handle mismatch (ours "LPX64", theirs "
607                                LPX64")\n", cluuid->uuid,
608                                exp->exp_connection->c_remote_uuid.uuid,
609                                hdl->cookie, conn->cookie);
610                         memset(conn, 0, sizeof *conn);
611                         /* target_handle_connect() treats EALREADY and
612                          * -EALREADY differently.  -EALREADY is an error
613                          * (same UUID, different handle). */
614                         RETURN(-EALREADY);
615                 }
616         }
617
618         conn->cookie = exp->exp_handle.h_cookie;
619         CDEBUG(D_HA, "connect export for UUID '%s' at %p, cookie "LPX64"\n",
620                cluuid->uuid, exp, conn->cookie);
621         RETURN(0);
622 }
623
624 void target_client_add_cb(struct obd_device *obd, __u64 transno, void *cb_data,
625                           int error)
626 {
627         struct obd_export *exp = cb_data;
628
629         CDEBUG(D_RPCTRACE, "%s: committing for initial connect of %s\n",
630                obd->obd_name, exp->exp_client_uuid.uuid);
631
632         cfs_spin_lock(&exp->exp_lock);
633         exp->exp_need_sync = 0;
634         cfs_spin_unlock(&exp->exp_lock);
635         class_export_cb_put(exp);
636 }
637 EXPORT_SYMBOL(target_client_add_cb);
638
639 static void
640 target_start_and_reset_recovery_timer(struct obd_device *obd,
641                                       struct ptlrpc_request *req,
642                                       int new_client);
643
644 int target_handle_connect(struct ptlrpc_request *req)
645 {
646         struct obd_device *target, *targref = NULL;
647         struct obd_export *export = NULL;
648         struct obd_import *revimp;
649         struct lustre_handle conn;
650         struct lustre_handle *tmp;
651         struct obd_uuid tgtuuid;
652         struct obd_uuid cluuid;
653         struct obd_uuid remote_uuid;
654         char *str;
655         int rc = 0;
656         int mds_conn = 0;
657         struct obd_connect_data *data, *tmpdata;
658         lnet_nid_t *client_nid = NULL;
659         ENTRY;
660
661         OBD_RACE(OBD_FAIL_TGT_CONN_RACE);
662
663         str = req_capsule_client_get(&req->rq_pill, &RMF_TGTUUID);
664         if (str == NULL) {
665                 DEBUG_REQ(D_ERROR, req, "bad target UUID for connect");
666                 GOTO(out, rc = -EINVAL);
667         }
668
669         obd_str2uuid(&tgtuuid, str);
670         target = class_uuid2obd(&tgtuuid);
671         if (!target)
672                 target = class_name2obd(str);
673
674         if (!target || target->obd_stopping || !target->obd_set_up) {
675                 LCONSOLE_ERROR_MSG(0x137, "UUID '%s' is not available "
676                                    " for connect (%s)\n", str,
677                                    !target ? "no target" :
678                                    (target->obd_stopping ? "stopping" :
679                                    "not set up"));
680                 GOTO(out, rc = -ENODEV);
681         }
682
683         if (target->obd_no_conn) {
684                 LCONSOLE_WARN("%s: temporarily refusing client connection "
685                               "from %s\n", target->obd_name,
686                               libcfs_nid2str(req->rq_peer.nid));
687                 GOTO(out, rc = -EAGAIN);
688         }
689
690         /* Make sure the target isn't cleaned up while we're here. Yes,
691            there's still a race between the above check and our incref here.
692            Really, class_uuid2obd should take the ref. */
693         targref = class_incref(target, __FUNCTION__, cfs_current());
694
695
696         str = req_capsule_client_get(&req->rq_pill, &RMF_CLUUID);
697         if (str == NULL) {
698                 DEBUG_REQ(D_ERROR, req, "bad client UUID for connect");
699                 GOTO(out, rc = -EINVAL);
700         }
701
702         obd_str2uuid(&cluuid, str);
703
704         /* XXX extract a nettype and format accordingly */
705         switch (sizeof(lnet_nid_t)) {
706                 /* NB the casts only avoid compiler warnings */
707         case 8:
708                 snprintf(remote_uuid.uuid, sizeof remote_uuid,
709                          "NET_"LPX64"_UUID", (__u64)req->rq_peer.nid);
710                 break;
711         case 4:
712                 snprintf(remote_uuid.uuid, sizeof remote_uuid,
713                          "NET_%x_UUID", (__u32)req->rq_peer.nid);
714                 break;
715         default:
716                 LBUG();
717         }
718
719         tmp = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
720         if (tmp == NULL)
721                 GOTO(out, rc = -EPROTO);
722
723         conn = *tmp;
724
725         data = req_capsule_client_get(&req->rq_pill, &RMF_CONNECT_DATA);
726         if (!data)
727                 GOTO(out, rc = -EPROTO);
728
729         rc = req_capsule_server_pack(&req->rq_pill);
730         if (rc)
731                 GOTO(out, rc);
732
733         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
734                 if (!data) {
735                         DEBUG_REQ(D_WARNING, req, "Refusing old (unversioned) "
736                                   "libclient connection attempt");
737                         GOTO(out, rc = -EPROTO);
738                 } else if (data->ocd_version < LUSTRE_VERSION_CODE -
739                                                LUSTRE_VERSION_ALLOWED_OFFSET ||
740                            data->ocd_version > LUSTRE_VERSION_CODE +
741                                                LUSTRE_VERSION_ALLOWED_OFFSET) {
742                         DEBUG_REQ(D_WARNING, req, "Refusing %s (%d.%d.%d.%d) "
743                                   "libclient connection attempt",
744                                   data->ocd_version < LUSTRE_VERSION_CODE ?
745                                   "old" : "new",
746                                   OBD_OCD_VERSION_MAJOR(data->ocd_version),
747                                   OBD_OCD_VERSION_MINOR(data->ocd_version),
748                                   OBD_OCD_VERSION_PATCH(data->ocd_version),
749                                   OBD_OCD_VERSION_FIX(data->ocd_version));
750                         data = req_capsule_server_sized_get(&req->rq_pill,
751                                                         &RMF_CONNECT_DATA,
752                                     offsetof(typeof(*data), ocd_version) +
753                                              sizeof(data->ocd_version));
754                         if (data) {
755                                 data->ocd_connect_flags = OBD_CONNECT_VERSION;
756                                 data->ocd_version = LUSTRE_VERSION_CODE;
757                         }
758                         GOTO(out, rc = -EPROTO);
759                 }
760         }
761
762         if ((lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_INITIAL) &&
763             (data->ocd_connect_flags & OBD_CONNECT_MDS))
764                 mds_conn = 1;
765
766         /* lctl gets a backstage, all-access pass. */
767         if (obd_uuid_equals(&cluuid, &target->obd_uuid))
768                 goto dont_check_exports;
769
770         export = cfs_hash_lookup(target->obd_uuid_hash, &cluuid);
771         if (!export)
772                 goto no_export;
773
774         /* we've found an export in the hash */
775         if (export->exp_connecting) { /* bug 9635, et. al. */
776                 CWARN("%s: exp %p already connecting\n",
777                       export->exp_obd->obd_name, export);
778                 class_export_put(export);
779                 export = NULL;
780                 rc = -EALREADY;
781         } else if (mds_conn && export->exp_connection) {
782                 if (req->rq_peer.nid != export->exp_connection->c_peer.nid)
783                         /* mds reconnected after failover */
784                         CWARN("%s: received MDS connection from NID %s,"
785                               " removing former export from NID %s\n",
786                             target->obd_name, libcfs_nid2str(req->rq_peer.nid),
787                             libcfs_nid2str(export->exp_connection->c_peer.nid));
788                 else
789                         /* new mds connection from the same nid */
790                         CWARN("%s: received new MDS connection from NID %s,"
791                               " removing former export from same NID\n",
792                             target->obd_name, libcfs_nid2str(req->rq_peer.nid));
793                 class_fail_export(export);
794                 class_export_put(export);
795                 export = NULL;
796                 rc = 0;
797         } else if (export->exp_connection != NULL &&
798                    req->rq_peer.nid != export->exp_connection->c_peer.nid &&
799                    (lustre_msg_get_op_flags(req->rq_reqmsg) &
800                     MSG_CONNECT_INITIAL)) {
801                 /* in mds failover we have static uuid but nid can be
802                  * changed*/
803                 CWARN("%s: cookie %s seen on new NID %s when "
804                       "existing NID %s is already connected\n",
805                       target->obd_name, cluuid.uuid,
806                       libcfs_nid2str(req->rq_peer.nid),
807                       libcfs_nid2str(export->exp_connection->c_peer.nid));
808                 rc = -EALREADY;
809                 class_export_put(export);
810                 export = NULL;
811         } else {
812                 cfs_spin_lock(&export->exp_lock);
813                 export->exp_connecting = 1;
814                 cfs_spin_unlock(&export->exp_lock);
815                 class_export_put(export);
816                 LASSERT(export->exp_obd == target);
817
818                 rc = target_handle_reconnect(&conn, export, &cluuid);
819         }
820
821         /* If we found an export, we already unlocked. */
822         if (!export) {
823 no_export:
824                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_CONNECT, 2 * obd_timeout);
825         } else if (req->rq_export == NULL &&
826                    cfs_atomic_read(&export->exp_rpc_count) > 0) {
827                 CWARN("%s: refuse connection from %s/%s to 0x%p/%d\n",
828                       target->obd_name, cluuid.uuid,
829                       libcfs_nid2str(req->rq_peer.nid),
830                       export, cfs_atomic_read(&export->exp_refcount));
831                 GOTO(out, rc = -EBUSY);
832         } else if (req->rq_export != NULL &&
833                    (cfs_atomic_read(&export->exp_rpc_count) > 1)) {
834                 /* the current connect rpc has increased exp_rpc_count */
835                 CWARN("%s: refuse reconnection from %s@%s to 0x%p/%d\n",
836                       target->obd_name, cluuid.uuid,
837                       libcfs_nid2str(req->rq_peer.nid),
838                       export, cfs_atomic_read(&export->exp_rpc_count) - 1);
839                 cfs_spin_lock(&export->exp_lock);
840                 if (req->rq_export->exp_conn_cnt <
841                     lustre_msg_get_conn_cnt(req->rq_reqmsg))
842                         /* try to abort active requests */
843                         req->rq_export->exp_abort_active_req = 1;
844                 cfs_spin_unlock(&export->exp_lock);
845                 GOTO(out, rc = -EBUSY);
846         } else if (lustre_msg_get_conn_cnt(req->rq_reqmsg) == 1) {
847                 CERROR("%s: NID %s (%s) reconnected with 1 conn_cnt; "
848                        "cookies not random?\n", target->obd_name,
849                        libcfs_nid2str(req->rq_peer.nid), cluuid.uuid);
850                 GOTO(out, rc = -EALREADY);
851         } else {
852                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_RECONNECT, 2 * obd_timeout);
853         }
854
855         if (rc < 0) {
856                 GOTO(out, rc);
857         }
858
859         CWARN("%s: connection from %s@%s %st"LPU64" exp %p cur %ld last %ld\n",
860                target->obd_name, cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
861               target->obd_recovering ? "recovering/" : "", data->ocd_transno,
862               export, (long)cfs_time_current_sec(),
863               export ? (long)export->exp_last_request_time : 0);
864
865         /* Tell the client if we're in recovery. */
866         if (target->obd_recovering) {
867                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECOVERING);
868                 /* If this is the first time a client connects,
869                    reset the recovery timer */
870                 if (rc == 0)
871                         target_start_and_reset_recovery_timer(target, req,
872                                                               !export);
873         }
874
875         /* We want to handle EALREADY but *not* -EALREADY from
876          * target_handle_reconnect(), return reconnection state in a flag */
877         if (rc == EALREADY) {
878                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECONNECT);
879                 rc = 0;
880         } else {
881                 LASSERT(rc == 0);
882         }
883
884         /* Tell the client if we support replayable requests */
885         if (target->obd_replayable)
886                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_REPLAYABLE);
887         client_nid = &req->rq_peer.nid;
888
889         if (export == NULL) {
890                 if (target->obd_recovering) {
891                         cfs_time_t t;
892
893                         t = cfs_timer_deadline(&target->obd_recovery_timer);
894                         t = cfs_time_sub(t, cfs_time_current());
895                         CERROR("%s: denying connection for new client %s (%s): "
896                                "%d clients in recovery for "CFS_TIME_T"s\n",
897                                target->obd_name,
898                                libcfs_nid2str(req->rq_peer.nid), cluuid.uuid,
899                                cfs_atomic_read(&target-> \
900                                                obd_lock_replay_clients),
901                                cfs_duration_sec(t));
902                         rc = -EBUSY;
903                 } else {
904 dont_check_exports:
905                         rc = obd_connect(req->rq_svc_thread->t_env,
906                                          &export, target, &cluuid, data,
907                                          client_nid);
908                         if (rc == 0)
909                                 conn.cookie = export->exp_handle.h_cookie;
910                 }
911         } else {
912                 rc = obd_reconnect(req->rq_svc_thread->t_env,
913                                    export, target, &cluuid, data, client_nid);
914                 if (rc == 0)
915                         /* prevous done via class_conn2export */
916                         class_export_get(export);
917         }
918         if (rc)
919                 GOTO(out, rc);
920         /* Return only the parts of obd_connect_data that we understand, so the
921          * client knows that we don't understand the rest. */
922         if (data) {
923                  tmpdata = req_capsule_server_get(&req->rq_pill,
924                                                   &RMF_CONNECT_DATA);
925                   //data->ocd_connect_flags &= OBD_CONNECT_SUPPORTED;
926                  *tmpdata = *data;
927         }
928
929         /* If all else goes well, this is our RPC return code. */
930         req->rq_status = 0;
931
932         lustre_msg_set_handle(req->rq_repmsg, &conn);
933
934         /* If the client and the server are the same node, we will already
935          * have an export that really points to the client's DLM export,
936          * because we have a shared handles table.
937          *
938          * XXX this will go away when shaver stops sending the "connect" handle
939          * in the real "remote handle" field of the request --phik 24 Apr 2003
940          */
941         if (req->rq_export != NULL)
942                 class_export_put(req->rq_export);
943
944         req->rq_export = export;
945
946         cfs_spin_lock(&export->exp_lock);
947         if (export->exp_conn_cnt >= lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
948                 cfs_spin_unlock(&export->exp_lock);
949                 CERROR("%s: %s already connected at higher conn_cnt: %d > %d\n",
950                        cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
951                        export->exp_conn_cnt,
952                        lustre_msg_get_conn_cnt(req->rq_reqmsg));
953
954                 GOTO(out, rc = -EALREADY);
955         }
956         LASSERT(lustre_msg_get_conn_cnt(req->rq_reqmsg) > 0);
957         export->exp_conn_cnt = lustre_msg_get_conn_cnt(req->rq_reqmsg);
958         export->exp_abort_active_req = 0;
959
960         /* request from liblustre?  Don't evict it for not pinging. */
961         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
962                 export->exp_libclient = 1;
963                 cfs_spin_unlock(&export->exp_lock);
964
965                 cfs_spin_lock(&target->obd_dev_lock);
966                 cfs_list_del_init(&export->exp_obd_chain_timed);
967                 cfs_spin_unlock(&target->obd_dev_lock);
968         } else {
969                 cfs_spin_unlock(&export->exp_lock);
970         }
971
972         if (export->exp_connection != NULL) {
973                 /* Check to see if connection came from another NID */
974                 if ((export->exp_connection->c_peer.nid != req->rq_peer.nid) &&
975                     !cfs_hlist_unhashed(&export->exp_nid_hash))
976                         cfs_hash_del(export->exp_obd->obd_nid_hash,
977                                      &export->exp_connection->c_peer.nid,
978                                      &export->exp_nid_hash);
979
980                 ptlrpc_connection_put(export->exp_connection);
981         }
982
983         export->exp_connection = ptlrpc_connection_get(req->rq_peer,
984                                                        req->rq_self,
985                                                        &remote_uuid);
986         if (cfs_hlist_unhashed(&export->exp_nid_hash)) {
987                 cfs_hash_add(export->exp_obd->obd_nid_hash,
988                              &export->exp_connection->c_peer.nid,
989                              &export->exp_nid_hash);
990         }
991
992         cfs_spin_lock(&target->obd_recovery_task_lock);
993         if (target->obd_recovering && !export->exp_in_recovery) {
994                 cfs_spin_lock(&export->exp_lock);
995                 export->exp_in_recovery = 1;
996                 export->exp_req_replay_needed = 1;
997                 export->exp_lock_replay_needed = 1;
998                 cfs_spin_unlock(&export->exp_lock);
999                 if ((lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_TRANSNO)
1000                      && (data->ocd_transno == 0))
1001                         CWARN("Connect with zero transno!\n");
1002
1003                 if ((lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_TRANSNO)
1004                      && data->ocd_transno < target->obd_next_recovery_transno)
1005                         target->obd_next_recovery_transno = data->ocd_transno;
1006                 target->obd_connected_clients++;
1007                 cfs_atomic_inc(&target->obd_req_replay_clients);
1008                 cfs_atomic_inc(&target->obd_lock_replay_clients);
1009                 if (target->obd_connected_clients ==
1010                     target->obd_max_recoverable_clients)
1011                         cfs_waitq_signal(&target->obd_next_transno_waitq);
1012         }
1013         cfs_spin_unlock(&target->obd_recovery_task_lock);
1014         tmp = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
1015         conn = *tmp;
1016
1017         if (export->exp_imp_reverse != NULL) {
1018                 /* destroyed import can be still referenced in ctxt */
1019                 obd_set_info_async(export, sizeof(KEY_REVIMP_UPD),
1020                                    KEY_REVIMP_UPD, 0, NULL, NULL);
1021
1022                 client_destroy_import(export->exp_imp_reverse);
1023         }
1024
1025         /* for the rest part, we return -ENOTCONN in case of errors
1026          * in order to let client initialize connection again.
1027          */
1028         revimp = export->exp_imp_reverse = class_new_import(target);
1029         if (!revimp) {
1030                 CERROR("fail to alloc new reverse import.\n");
1031                 GOTO(out, rc = -ENOTCONN);
1032         }
1033
1034         revimp->imp_connection = ptlrpc_connection_addref(export->exp_connection);
1035         revimp->imp_client = &export->exp_obd->obd_ldlm_client;
1036         revimp->imp_remote_handle = conn;
1037         revimp->imp_dlm_fake = 1;
1038         revimp->imp_state = LUSTRE_IMP_FULL;
1039
1040         /* unknown versions will be caught in
1041          * ptlrpc_handle_server_req_in->lustre_unpack_msg() */
1042         revimp->imp_msg_magic = req->rq_reqmsg->lm_magic;
1043
1044         if ((export->exp_connect_flags & OBD_CONNECT_AT) &&
1045             (revimp->imp_msg_magic != LUSTRE_MSG_MAGIC_V1))
1046                 revimp->imp_msghdr_flags |= MSGHDR_AT_SUPPORT;
1047         else
1048                 revimp->imp_msghdr_flags &= ~MSGHDR_AT_SUPPORT;
1049
1050         if ((export->exp_connect_flags & OBD_CONNECT_FULL20) &&
1051             (revimp->imp_msg_magic != LUSTRE_MSG_MAGIC_V1))
1052                 revimp->imp_msghdr_flags |= MSGHDR_CKSUM_INCOMPAT18;
1053         else
1054                 revimp->imp_msghdr_flags &= ~MSGHDR_CKSUM_INCOMPAT18;
1055
1056         rc = sptlrpc_import_sec_adapt(revimp, req->rq_svc_ctx, &req->rq_flvr);
1057         if (rc) {
1058                 CERROR("Failed to get sec for reverse import: %d\n", rc);
1059                 export->exp_imp_reverse = NULL;
1060                 class_destroy_import(revimp);
1061         }
1062
1063         class_import_put(revimp);
1064 out:
1065         if (export) {
1066                 cfs_spin_lock(&export->exp_lock);
1067                 export->exp_connecting = 0;
1068                 cfs_spin_unlock(&export->exp_lock);
1069         }
1070         if (targref)
1071                 class_decref(targref, __FUNCTION__, cfs_current());
1072         if (rc)
1073                 req->rq_status = rc;
1074         RETURN(rc);
1075 }
1076
1077 int target_handle_disconnect(struct ptlrpc_request *req)
1078 {
1079         int rc;
1080         ENTRY;
1081
1082         rc = req_capsule_server_pack(&req->rq_pill);
1083         if (rc)
1084                 RETURN(rc);
1085
1086         /* keep the rq_export around so we can send the reply */
1087         req->rq_status = obd_disconnect(class_export_get(req->rq_export));
1088
1089         RETURN(0);
1090 }
1091
1092 void target_destroy_export(struct obd_export *exp)
1093 {
1094         /* exports created from last_rcvd data, and "fake"
1095            exports created by lctl don't have an import */
1096         if (exp->exp_imp_reverse != NULL)
1097                 client_destroy_import(exp->exp_imp_reverse);
1098
1099         LASSERT(cfs_atomic_read(&exp->exp_locks_count) == 0);
1100         LASSERT(cfs_atomic_read(&exp->exp_rpc_count) == 0);
1101         LASSERT(cfs_atomic_read(&exp->exp_cb_count) == 0);
1102         LASSERT(cfs_atomic_read(&exp->exp_replay_count) == 0);
1103 }
1104
1105 /*
1106  * Recovery functions
1107  */
1108 static void target_request_copy_get(struct ptlrpc_request *req)
1109 {
1110         class_export_rpc_get(req->rq_export);
1111         LASSERT(cfs_list_empty(&req->rq_list));
1112         CFS_INIT_LIST_HEAD(&req->rq_replay_list);
1113         /* increase refcount to keep request in queue */
1114         LASSERT(cfs_atomic_read(&req->rq_refcount));
1115         cfs_atomic_inc(&req->rq_refcount);
1116         /** let export know it has replays to be handled */
1117         cfs_atomic_inc(&req->rq_export->exp_replay_count);
1118         /* release service thread while request is queued 
1119          * we are moving the request from active processing
1120          * to waiting on the replay queue */
1121         ptlrpc_server_active_request_dec(req);
1122 }
1123
1124 static void target_request_copy_put(struct ptlrpc_request *req)
1125 {
1126         LASSERT(cfs_list_empty(&req->rq_replay_list));
1127         LASSERT(cfs_atomic_read(&req->rq_export->exp_replay_count) > 0);
1128         cfs_atomic_dec(&req->rq_export->exp_replay_count);
1129         class_export_rpc_put(req->rq_export);
1130         /* ptlrpc_server_drop_request() assumes the request is active */
1131         ptlrpc_server_active_request_inc(req);
1132         ptlrpc_server_drop_request(req);
1133 }
1134
1135 static int target_exp_enqueue_req_replay(struct ptlrpc_request *req)
1136 {
1137         __u64                  transno = lustre_msg_get_transno(req->rq_reqmsg);
1138         struct obd_export     *exp = req->rq_export;
1139         struct ptlrpc_request *reqiter;
1140         int                    dup = 0;
1141
1142         LASSERT(exp);
1143
1144         cfs_spin_lock(&exp->exp_lock);
1145         cfs_list_for_each_entry(reqiter, &exp->exp_req_replay_queue,
1146                                 rq_replay_list) {
1147                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) == transno) {
1148                         dup = 1;
1149                         break;
1150                 }
1151         }
1152
1153         if (dup) {
1154                 /* we expect it with RESENT and REPLAY flags */
1155                 if ((lustre_msg_get_flags(req->rq_reqmsg) &
1156                      (MSG_RESENT | MSG_REPLAY)) != (MSG_RESENT | MSG_REPLAY))
1157                         CERROR("invalid flags %x of resent replay\n",
1158                                lustre_msg_get_flags(req->rq_reqmsg));
1159         } else {
1160                 cfs_list_add_tail(&req->rq_replay_list,
1161                                   &exp->exp_req_replay_queue);
1162         }
1163
1164         cfs_spin_unlock(&exp->exp_lock);
1165         return dup;
1166 }
1167
1168 static void target_exp_dequeue_req_replay(struct ptlrpc_request *req)
1169 {
1170         LASSERT(!cfs_list_empty(&req->rq_replay_list));
1171         LASSERT(req->rq_export);
1172
1173         cfs_spin_lock(&req->rq_export->exp_lock);
1174         cfs_list_del_init(&req->rq_replay_list);
1175         cfs_spin_unlock(&req->rq_export->exp_lock);
1176 }
1177
1178 #ifdef __KERNEL__
1179 static void target_finish_recovery(struct obd_device *obd)
1180 {
1181         ENTRY;
1182         LCONSOLE_INFO("%s: sending delayed replies to recovered clients\n",
1183                       obd->obd_name);
1184
1185         ldlm_reprocess_all_ns(obd->obd_namespace);
1186         cfs_spin_lock(&obd->obd_recovery_task_lock);
1187         if (!cfs_list_empty(&obd->obd_req_replay_queue) ||
1188             !cfs_list_empty(&obd->obd_lock_replay_queue) ||
1189             !cfs_list_empty(&obd->obd_final_req_queue)) {
1190                 CERROR("%s: Recovery queues ( %s%s%s) are not empty\n",
1191                        obd->obd_name,
1192                        cfs_list_empty(&obd->obd_req_replay_queue) ? "" : "req ",
1193                        cfs_list_empty(&obd->obd_lock_replay_queue) ? \
1194                                "" : "lock ",
1195                        cfs_list_empty(&obd->obd_final_req_queue) ? \
1196                                "" : "final ");
1197                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
1198                 LBUG();
1199         }
1200         cfs_spin_unlock(&obd->obd_recovery_task_lock);
1201
1202         obd->obd_recovery_end = cfs_time_current_sec();
1203
1204         /* when recovery finished, cleanup orphans on mds and ost */
1205         if (OBT(obd) && OBP(obd, postrecov)) {
1206                 int rc = OBP(obd, postrecov)(obd);
1207                 if (rc < 0)
1208                         LCONSOLE_WARN("%s: Post recovery failed, rc %d\n",
1209                                       obd->obd_name, rc);
1210         }
1211         EXIT;
1212 }
1213
1214 static void abort_req_replay_queue(struct obd_device *obd)
1215 {
1216         struct ptlrpc_request *req, *n;
1217         cfs_list_t abort_list;
1218
1219         CFS_INIT_LIST_HEAD(&abort_list);
1220         cfs_spin_lock(&obd->obd_recovery_task_lock);
1221         cfs_list_splice_init(&obd->obd_req_replay_queue, &abort_list);
1222         cfs_spin_unlock(&obd->obd_recovery_task_lock);
1223         cfs_list_for_each_entry_safe(req, n, &abort_list, rq_list) {
1224                 DEBUG_REQ(D_WARNING, req, "aborted:");
1225                 req->rq_status = -ENOTCONN;
1226                 if (ptlrpc_error(req)) {
1227                         DEBUG_REQ(D_ERROR, req,
1228                                   "failed abort_req_reply; skipping");
1229                 }
1230                 target_exp_dequeue_req_replay(req);
1231                 target_request_copy_put(req);
1232         }
1233 }
1234
1235 static void abort_lock_replay_queue(struct obd_device *obd)
1236 {
1237         struct ptlrpc_request *req, *n;
1238         cfs_list_t abort_list;
1239
1240         CFS_INIT_LIST_HEAD(&abort_list);
1241         cfs_spin_lock(&obd->obd_recovery_task_lock);
1242         cfs_list_splice_init(&obd->obd_lock_replay_queue, &abort_list);
1243         cfs_spin_unlock(&obd->obd_recovery_task_lock);
1244         cfs_list_for_each_entry_safe(req, n, &abort_list, rq_list){
1245                 DEBUG_REQ(D_ERROR, req, "aborted:");
1246                 req->rq_status = -ENOTCONN;
1247                 if (ptlrpc_error(req)) {
1248                         DEBUG_REQ(D_ERROR, req,
1249                                   "failed abort_lock_reply; skipping");
1250                 }
1251                 target_request_copy_put(req);
1252         }
1253 }
1254 #endif
1255
1256 /* Called from a cleanup function if the device is being cleaned up
1257    forcefully.  The exports should all have been disconnected already,
1258    the only thing left to do is
1259      - clear the recovery flags
1260      - cancel the timer
1261      - free queued requests and replies, but don't send replies
1262    Because the obd_stopping flag is set, no new requests should be received.
1263
1264 */
1265 void target_cleanup_recovery(struct obd_device *obd)
1266 {
1267         struct ptlrpc_request *req, *n;
1268         cfs_list_t clean_list;
1269         ENTRY;
1270
1271         CFS_INIT_LIST_HEAD(&clean_list);
1272         cfs_spin_lock(&obd->obd_dev_lock);
1273         if (!obd->obd_recovering) {
1274                 cfs_spin_unlock(&obd->obd_dev_lock);
1275                 EXIT;
1276                 return;
1277         }
1278         obd->obd_recovering = obd->obd_abort_recovery = 0;
1279         cfs_spin_unlock(&obd->obd_dev_lock);
1280
1281         cfs_spin_lock(&obd->obd_recovery_task_lock);
1282         target_cancel_recovery_timer(obd);
1283         cfs_list_splice_init(&obd->obd_req_replay_queue, &clean_list);
1284         cfs_spin_unlock(&obd->obd_recovery_task_lock);
1285
1286         cfs_list_for_each_entry_safe(req, n, &clean_list, rq_list) {
1287                 LASSERT(req->rq_reply_state == 0);
1288                 target_exp_dequeue_req_replay(req);
1289                 target_request_copy_put(req);
1290         }
1291
1292         cfs_spin_lock(&obd->obd_recovery_task_lock);
1293         cfs_list_splice_init(&obd->obd_lock_replay_queue, &clean_list);
1294         cfs_list_splice_init(&obd->obd_final_req_queue, &clean_list);
1295         cfs_spin_unlock(&obd->obd_recovery_task_lock);
1296
1297         cfs_list_for_each_entry_safe(req, n, &clean_list, rq_list){
1298                 LASSERT(req->rq_reply_state == 0);
1299                 target_request_copy_put(req);
1300         }
1301
1302         EXIT;
1303 }
1304
1305 /* obd_recovery_task_lock should be held */
1306 void target_cancel_recovery_timer(struct obd_device *obd)
1307 {
1308         CDEBUG(D_HA, "%s: cancel recovery timer\n", obd->obd_name);
1309         cfs_timer_disarm(&obd->obd_recovery_timer);
1310 }
1311
1312 /* extend = 1 means require at least "duration" seconds left in the timer,
1313    extend = 0 means set the total duration (start_recovery_timer) */
1314 static void reset_recovery_timer(struct obd_device *obd, int duration,
1315                                  int extend)
1316 {
1317         cfs_time_t now = cfs_time_current_sec();
1318         cfs_duration_t left;
1319
1320         cfs_spin_lock(&obd->obd_recovery_task_lock);
1321         if (!obd->obd_recovering || obd->obd_abort_recovery) {
1322                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
1323                 return;
1324         }
1325
1326         left = cfs_time_sub(obd->obd_recovery_end, now);
1327
1328         if (extend && (duration > left))
1329                 obd->obd_recovery_timeout += duration - left;
1330         else if (!extend && (duration > obd->obd_recovery_timeout))
1331                 /* Track the client's largest expected replay time */
1332                 obd->obd_recovery_timeout = duration;
1333
1334         /* Hard limit of obd_recovery_time_hard which should not happen */
1335         if (obd->obd_recovery_timeout > obd->obd_recovery_time_hard)
1336                 obd->obd_recovery_timeout = obd->obd_recovery_time_hard;
1337
1338         obd->obd_recovery_end = obd->obd_recovery_start +
1339                                 obd->obd_recovery_timeout;
1340         if (!cfs_timer_is_armed(&obd->obd_recovery_timer) ||
1341             cfs_time_before(now, obd->obd_recovery_end)) {
1342                 left = cfs_time_sub(obd->obd_recovery_end, now);
1343                 cfs_timer_arm(&obd->obd_recovery_timer, cfs_time_shift(left));
1344         }
1345         cfs_spin_unlock(&obd->obd_recovery_task_lock);
1346         CDEBUG(D_HA, "%s: recovery timer will expire in %u seconds\n",
1347                obd->obd_name, (unsigned)left);
1348 }
1349
1350 static void check_and_start_recovery_timer(struct obd_device *obd)
1351 {
1352         cfs_spin_lock(&obd->obd_recovery_task_lock);
1353         if (cfs_timer_is_armed(&obd->obd_recovery_timer)) {
1354                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
1355                 return;
1356         }
1357         CDEBUG(D_HA, "%s: starting recovery timer\n", obd->obd_name);
1358         obd->obd_recovery_start = cfs_time_current_sec();
1359         cfs_spin_unlock(&obd->obd_recovery_task_lock);
1360
1361         reset_recovery_timer(obd, obd->obd_recovery_timeout, 0);
1362 }
1363
1364 /* Reset the timer with each new client connection */
1365 /*
1366  * This timer is actually reconnect_timer, which is for making sure
1367  * the total recovery window is at least as big as my reconnect
1368  * attempt timing. So the initial recovery time_out will be set to
1369  * OBD_RECOVERY_FACTOR * obd_timeout. If the timeout coming
1370  * from client is bigger than this, then the recovery time_out will
1371  * be extended to make sure the client could be reconnected, in the
1372  * process, the timeout from the new client should be ignored.
1373  */
1374
1375 static void
1376 target_start_and_reset_recovery_timer(struct obd_device *obd,
1377                                       struct ptlrpc_request *req,
1378                                       int new_client)
1379 {
1380         int service_time = lustre_msg_get_service_time(req->rq_reqmsg);
1381
1382         if (!new_client && service_time)
1383                 /* Teach server about old server's estimates, as first guess
1384                  * at how long new requests will take. */
1385                 at_measured(&req->rq_rqbd->rqbd_service->srv_at_estimate,
1386                             service_time);
1387
1388         check_and_start_recovery_timer(obd);
1389
1390         /* convert the service time to rpc timeout,
1391          * reuse service_time to limit stack usage */
1392         service_time = at_est2timeout(service_time);
1393
1394         /* We expect other clients to timeout within service_time, then try
1395          * to reconnect, then try the failover server.  The max delay between
1396          * connect attempts is SWITCH_MAX + SWITCH_INC + INITIAL */
1397         service_time += 2 * (CONNECTION_SWITCH_MAX + CONNECTION_SWITCH_INC +
1398                              INITIAL_CONNECT_TIMEOUT);
1399         if (service_time > obd->obd_recovery_timeout && !new_client)
1400                 reset_recovery_timer(obd, service_time, 0);
1401 }
1402
1403 #ifdef __KERNEL__
1404
1405 /** Health checking routines */
1406 static inline int exp_connect_healthy(struct obd_export *exp)
1407 {
1408         return (exp->exp_in_recovery);
1409 }
1410
1411 /** if export done req_replay or has replay in queue */
1412 static inline int exp_req_replay_healthy(struct obd_export *exp)
1413 {
1414         return (!exp->exp_req_replay_needed ||
1415                 cfs_atomic_read(&exp->exp_replay_count) > 0);
1416 }
1417 /** if export done lock_replay or has replay in queue */
1418 static inline int exp_lock_replay_healthy(struct obd_export *exp)
1419 {
1420         return (!exp->exp_lock_replay_needed ||
1421                 cfs_atomic_read(&exp->exp_replay_count) > 0);
1422 }
1423
1424 static inline int exp_vbr_healthy(struct obd_export *exp)
1425 {
1426         return (!exp->exp_vbr_failed);
1427 }
1428
1429 static inline int exp_finished(struct obd_export *exp)
1430 {
1431         return (exp->exp_in_recovery && !exp->exp_lock_replay_needed);
1432 }
1433
1434 /** Checking routines for recovery */
1435 static int check_for_clients(struct obd_device *obd)
1436 {
1437         if (obd->obd_abort_recovery || obd->obd_recovery_expired)
1438                 return 1;
1439         LASSERT(obd->obd_connected_clients <= obd->obd_max_recoverable_clients);
1440         if (obd->obd_no_conn == 0 &&
1441             obd->obd_connected_clients + obd->obd_stale_clients ==
1442             obd->obd_max_recoverable_clients)
1443                 return 1;
1444         return 0;
1445 }
1446
1447 static int check_for_next_transno(struct obd_device *obd)
1448 {
1449         struct ptlrpc_request *req = NULL;
1450         int wake_up = 0, connected, completed, queue_len;
1451         __u64 next_transno, req_transno;
1452         ENTRY;
1453
1454         cfs_spin_lock(&obd->obd_recovery_task_lock);
1455         if (!cfs_list_empty(&obd->obd_req_replay_queue)) {
1456                 req = cfs_list_entry(obd->obd_req_replay_queue.next,
1457                                      struct ptlrpc_request, rq_list);
1458                 req_transno = lustre_msg_get_transno(req->rq_reqmsg);
1459         } else {
1460                 req_transno = 0;
1461         }
1462
1463         connected = obd->obd_connected_clients;
1464         completed = connected - cfs_atomic_read(&obd->obd_req_replay_clients);
1465         queue_len = obd->obd_requests_queued_for_recovery;
1466         next_transno = obd->obd_next_recovery_transno;
1467
1468         CDEBUG(D_HA, "max: %d, connected: %d, completed: %d, queue_len: %d, "
1469                "req_transno: "LPU64", next_transno: "LPU64"\n",
1470                obd->obd_max_recoverable_clients, connected, completed,
1471                queue_len, req_transno, next_transno);
1472
1473         if (obd->obd_abort_recovery) {
1474                 CDEBUG(D_HA, "waking for aborted recovery\n");
1475                 wake_up = 1;
1476         } else if (obd->obd_recovery_expired) {
1477                 CDEBUG(D_HA, "waking for expired recovery\n");
1478                 wake_up = 1;
1479         } else if (cfs_atomic_read(&obd->obd_req_replay_clients) == 0) {
1480                 CDEBUG(D_HA, "waking for completed recovery\n");
1481                 wake_up = 1;
1482         } else if (req_transno == next_transno) {
1483                 CDEBUG(D_HA, "waking for next ("LPD64")\n", next_transno);
1484                 wake_up = 1;
1485         } else if (queue_len == cfs_atomic_read(&obd->obd_req_replay_clients)) {
1486                 int d_lvl = D_HA;
1487                 /** handle gaps occured due to lost reply or VBR */
1488                 LASSERTF(req_transno >= next_transno,
1489                          "req_transno: "LPU64", next_transno: "LPU64"\n",
1490                          req_transno, next_transno);
1491                 if (req_transno > obd->obd_last_committed &&
1492                     !obd->obd_version_recov)
1493                         d_lvl = D_ERROR;
1494                 CDEBUG(d_lvl,
1495                        "%s: waking for gap in transno, VBR is %s (skip: "
1496                        LPD64", ql: %d, comp: %d, conn: %d, next: "LPD64
1497                        ", last_committed: "LPD64")\n",
1498                        obd->obd_name, obd->obd_version_recov ? "ON" : "OFF",
1499                        next_transno, queue_len, completed, connected,
1500                        req_transno, obd->obd_last_committed);
1501                 obd->obd_next_recovery_transno = req_transno;
1502                 wake_up = 1;
1503         } else if (OBD_FAIL_CHECK(OBD_FAIL_MDS_RECOVERY_ACCEPTS_GAPS)) {
1504                 CDEBUG(D_HA, "accepting transno gaps is explicitly allowed"
1505                        " by fail_lock, waking up ("LPD64")\n", next_transno);
1506                 obd->obd_next_recovery_transno = req_transno;
1507                 wake_up = 1;
1508         }
1509         cfs_spin_unlock(&obd->obd_recovery_task_lock);
1510         return wake_up;
1511 }
1512
1513 static int check_for_next_lock(struct obd_device *obd)
1514 {
1515         int wake_up = 0;
1516
1517         cfs_spin_lock(&obd->obd_recovery_task_lock);
1518         if (!cfs_list_empty(&obd->obd_lock_replay_queue)) {
1519                 CDEBUG(D_HA, "waking for next lock\n");
1520                 wake_up = 1;
1521         } else if (cfs_atomic_read(&obd->obd_lock_replay_clients) == 0) {
1522                 CDEBUG(D_HA, "waking for completed lock replay\n");
1523                 wake_up = 1;
1524         } else if (obd->obd_abort_recovery) {
1525                 CDEBUG(D_HA, "waking for aborted recovery\n");
1526                 wake_up = 1;
1527         } else if (obd->obd_recovery_expired) {
1528                 CDEBUG(D_HA, "waking for expired recovery\n");
1529                 wake_up = 1;
1530         }
1531         cfs_spin_unlock(&obd->obd_recovery_task_lock);
1532
1533         return wake_up;
1534 }
1535
1536 /**
1537  * wait for recovery events,
1538  * check its status with help of check_routine
1539  * evict dead clients via health_check
1540  */
1541 static int target_recovery_overseer(struct obd_device *obd,
1542                                     int (*check_routine)(struct obd_device *),
1543                                     int (*health_check)(struct obd_export *))
1544 {
1545 repeat:
1546         cfs_wait_event(obd->obd_next_transno_waitq, check_routine(obd));
1547         if (obd->obd_abort_recovery) {
1548                 CWARN("recovery is aborted, evict exports in recovery\n");
1549                 /** evict exports which didn't finish recovery yet */
1550                 class_disconnect_stale_exports(obd, exp_finished);
1551                 return 1;
1552         } else if (obd->obd_recovery_expired) {
1553                 obd->obd_recovery_expired = 0;
1554                 /** If some clients died being recovered, evict them */
1555                 CDEBUG(D_WARNING,
1556                        "recovery is timed out, evict stale exports\n");
1557                 /** evict cexports with no replay in queue, they are stalled */
1558                 class_disconnect_stale_exports(obd, health_check);
1559                 /** continue with VBR */
1560                 cfs_spin_lock(&obd->obd_dev_lock);
1561                 obd->obd_version_recov = 1;
1562                 cfs_spin_unlock(&obd->obd_dev_lock);
1563                 /**
1564                  * reset timer, recovery will proceed with versions now,
1565                  * timeout is set just to handle reconnection delays
1566                  */
1567                 reset_recovery_timer(obd, RECONNECT_DELAY_MAX, 1);
1568                 /** Wait for recovery events again, after evicting bad clients */
1569                 goto repeat;
1570         }
1571         return 0;
1572 }
1573
1574 static struct ptlrpc_request *target_next_replay_req(struct obd_device *obd)
1575 {
1576         struct ptlrpc_request *req = NULL;
1577         ENTRY;
1578
1579         CDEBUG(D_HA, "Waiting for transno "LPD64"\n",
1580                obd->obd_next_recovery_transno);
1581
1582         if (target_recovery_overseer(obd, check_for_next_transno,
1583                                      exp_req_replay_healthy)) {
1584                 abort_req_replay_queue(obd);
1585                 abort_lock_replay_queue(obd);
1586         }
1587
1588         cfs_spin_lock(&obd->obd_recovery_task_lock);
1589         if (!cfs_list_empty(&obd->obd_req_replay_queue)) {
1590                 req = cfs_list_entry(obd->obd_req_replay_queue.next,
1591                                      struct ptlrpc_request, rq_list);
1592                 cfs_list_del_init(&req->rq_list);
1593                 obd->obd_requests_queued_for_recovery--;
1594                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
1595         } else {
1596                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
1597                 LASSERT(cfs_list_empty(&obd->obd_req_replay_queue));
1598                 LASSERT(cfs_atomic_read(&obd->obd_req_replay_clients) == 0);
1599                 /** evict exports failed VBR */
1600                 class_disconnect_stale_exports(obd, exp_vbr_healthy);
1601         }
1602         RETURN(req);
1603 }
1604
1605 static struct ptlrpc_request *target_next_replay_lock(struct obd_device *obd)
1606 {
1607         struct ptlrpc_request *req = NULL;
1608
1609         CDEBUG(D_HA, "Waiting for lock\n");
1610         if (target_recovery_overseer(obd, check_for_next_lock,
1611                                      exp_lock_replay_healthy))
1612                 abort_lock_replay_queue(obd);
1613
1614         cfs_spin_lock(&obd->obd_recovery_task_lock);
1615         if (!cfs_list_empty(&obd->obd_lock_replay_queue)) {
1616                 req = cfs_list_entry(obd->obd_lock_replay_queue.next,
1617                                      struct ptlrpc_request, rq_list);
1618                 cfs_list_del_init(&req->rq_list);
1619                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
1620         } else {
1621                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
1622                 LASSERT(cfs_list_empty(&obd->obd_lock_replay_queue));
1623                 LASSERT(cfs_atomic_read(&obd->obd_lock_replay_clients) == 0);
1624                 /** evict exports failed VBR */
1625                 class_disconnect_stale_exports(obd, exp_vbr_healthy);
1626         }
1627         return req;
1628 }
1629
1630 static struct ptlrpc_request *target_next_final_ping(struct obd_device *obd)
1631 {
1632         struct ptlrpc_request *req = NULL;
1633
1634         cfs_spin_lock(&obd->obd_recovery_task_lock);
1635         if (!cfs_list_empty(&obd->obd_final_req_queue)) {
1636                 req = cfs_list_entry(obd->obd_final_req_queue.next,
1637                                      struct ptlrpc_request, rq_list);
1638                 cfs_list_del_init(&req->rq_list);
1639                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
1640                 if (req->rq_export->exp_in_recovery) {
1641                         cfs_spin_lock(&req->rq_export->exp_lock);
1642                         req->rq_export->exp_in_recovery = 0;
1643                         cfs_spin_unlock(&req->rq_export->exp_lock);
1644                 }
1645         } else {
1646                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
1647         }
1648         return req;
1649 }
1650
1651 static int handle_recovery_req(struct ptlrpc_thread *thread,
1652                                struct ptlrpc_request *req,
1653                                svc_handler_t handler)
1654 {
1655         int rc;
1656         ENTRY;
1657
1658         /**
1659          * export can be evicted during recovery, no need to handle replays for
1660          * it after that, discard such request silently
1661          */
1662         if (req->rq_export->exp_disconnected)
1663                 GOTO(reqcopy_put, rc = 0);
1664
1665         rc = lu_context_init(&req->rq_recov_session, LCT_SESSION);
1666         if (rc) {
1667                 CERROR("Failure to initialize session: %d\n", rc);
1668                 GOTO(reqcopy_put, rc);
1669         }
1670
1671         req->rq_recov_session.lc_thread = thread;
1672         lu_context_enter(&req->rq_recov_session);
1673         req->rq_svc_thread = thread;
1674         req->rq_svc_thread->t_env->le_ses = &req->rq_recov_session;
1675
1676         /* thread context */
1677         lu_context_enter(&thread->t_env->le_ctx);
1678         (void)handler(req);
1679         lu_context_exit(&thread->t_env->le_ctx);
1680
1681         lu_context_exit(&req->rq_recov_session);
1682         lu_context_fini(&req->rq_recov_session);
1683         /* don't reset timer for final stage */
1684         if (!exp_finished(req->rq_export)) {
1685                 /**
1686                  * Add request timeout to the recovery time so next request from
1687                  * this client may come in recovery time
1688                  */
1689                  reset_recovery_timer(class_exp2obd(req->rq_export),
1690                                       AT_OFF ? obd_timeout :
1691                                       lustre_msg_get_timeout(req->rq_reqmsg), 1);
1692         }
1693 reqcopy_put:
1694         RETURN(rc);
1695 }
1696
1697 static int target_recovery_thread(void *arg)
1698 {
1699         struct lu_target *lut = arg;
1700         struct obd_device *obd = lut->lut_obd;
1701         struct ptlrpc_request *req;
1702         struct target_recovery_data *trd = &obd->obd_recovery_data;
1703         unsigned long delta;
1704         unsigned long flags;
1705         struct lu_env env;
1706         struct ptlrpc_thread fake_svc_thread, *thread = &fake_svc_thread;
1707         int rc = 0;
1708         ENTRY;
1709
1710         cfs_daemonize_ctxt("tgt_recov");
1711
1712         SIGNAL_MASK_LOCK(current, flags);
1713         sigfillset(&current->blocked);
1714         RECALC_SIGPENDING;
1715         SIGNAL_MASK_UNLOCK(current, flags);
1716
1717         rc = lu_context_init(&env.le_ctx, LCT_MD_THREAD);
1718         if (rc)
1719                 RETURN(rc);
1720
1721         thread->t_env = &env;
1722         thread->t_id = -1; /* force filter_iobuf_get/put to use local buffers */
1723         env.le_ctx.lc_thread = thread;
1724         thread->t_data = NULL;
1725
1726         CERROR("%s: started recovery thread pid %d\n", obd->obd_name,
1727                cfs_curproc_pid());
1728         trd->trd_processing_task = cfs_curproc_pid();
1729
1730         cfs_spin_lock(&obd->obd_dev_lock);
1731         obd->obd_recovering = 1;
1732         cfs_spin_unlock(&obd->obd_dev_lock);
1733         cfs_complete(&trd->trd_starting);
1734
1735         /* first of all, we have to know the first transno to replay */
1736         if (target_recovery_overseer(obd, check_for_clients,
1737                                      exp_connect_healthy)) {
1738                 abort_req_replay_queue(obd);
1739                 abort_lock_replay_queue(obd);
1740         }
1741
1742         /* next stage: replay requests */
1743         delta = jiffies;
1744         CDEBUG(D_INFO, "1: request replay stage - %d clients from t"LPU64"\n",
1745                cfs_atomic_read(&obd->obd_req_replay_clients),
1746                obd->obd_next_recovery_transno);
1747         while ((req = target_next_replay_req(obd))) {
1748                 LASSERT(trd->trd_processing_task == cfs_curproc_pid());
1749                 DEBUG_REQ(D_HA, req, "processing t"LPD64" from %s",
1750                           lustre_msg_get_transno(req->rq_reqmsg),
1751                           libcfs_nid2str(req->rq_peer.nid));
1752                 handle_recovery_req(thread, req,
1753                                     trd->trd_recovery_handler);
1754                 /**
1755                  * bz18031: increase next_recovery_transno before
1756                  * target_request_copy_put() will drop exp_rpc reference
1757                  */
1758                 cfs_spin_lock(&obd->obd_recovery_task_lock);
1759                 obd->obd_next_recovery_transno++;
1760                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
1761                 target_exp_dequeue_req_replay(req);
1762                 target_request_copy_put(req);
1763                 obd->obd_replayed_requests++;
1764         }
1765
1766         /**
1767          * The second stage: replay locks
1768          */
1769         CDEBUG(D_INFO, "2: lock replay stage - %d clients\n",
1770                cfs_atomic_read(&obd->obd_lock_replay_clients));
1771         while ((req = target_next_replay_lock(obd))) {
1772                 LASSERT(trd->trd_processing_task == cfs_curproc_pid());
1773                 DEBUG_REQ(D_HA, req, "processing lock from %s: ",
1774                           libcfs_nid2str(req->rq_peer.nid));
1775                 handle_recovery_req(thread, req,
1776                                     trd->trd_recovery_handler);
1777                 target_request_copy_put(req);
1778                 obd->obd_replayed_locks++;
1779         }
1780
1781         /**
1782          * The third stage: reply on final pings, at this moment all clients
1783          * must have request in final queue
1784          */
1785         CDEBUG(D_INFO, "3: final stage - process recovery completion pings\n");
1786         /** Update server last boot epoch */
1787         lut_boot_epoch_update(lut);
1788         /* We drop recoverying flag to forward all new requests
1789          * to regular mds_handle() since now */
1790         cfs_spin_lock(&obd->obd_dev_lock);
1791         obd->obd_recovering = obd->obd_abort_recovery = 0;
1792         cfs_spin_unlock(&obd->obd_dev_lock);
1793         cfs_spin_lock(&obd->obd_recovery_task_lock);
1794         target_cancel_recovery_timer(obd);
1795         cfs_spin_unlock(&obd->obd_recovery_task_lock);
1796         while ((req = target_next_final_ping(obd))) {
1797                 LASSERT(trd->trd_processing_task == cfs_curproc_pid());
1798                 DEBUG_REQ(D_HA, req, "processing final ping from %s: ",
1799                           libcfs_nid2str(req->rq_peer.nid));
1800                 handle_recovery_req(thread, req,
1801                                     trd->trd_recovery_handler);
1802                 target_request_copy_put(req);
1803         }
1804
1805         delta = (jiffies - delta) / CFS_HZ;
1806         CDEBUG(D_INFO,"4: recovery completed in %lus - %d/%d reqs/locks\n",
1807               delta, obd->obd_replayed_requests, obd->obd_replayed_locks);
1808         if (delta > OBD_RECOVERY_TIME_SOFT) {
1809                 CWARN("too long recovery - read logs\n");
1810                 libcfs_debug_dumplog();
1811         }
1812
1813         target_finish_recovery(obd);
1814
1815         lu_context_fini(&env.le_ctx);
1816         trd->trd_processing_task = 0;
1817         cfs_complete(&trd->trd_finishing);
1818         RETURN(rc);
1819 }
1820
1821 static int target_start_recovery_thread(struct lu_target *lut,
1822                                         svc_handler_t handler)
1823 {
1824         struct obd_device *obd = lut->lut_obd;
1825         int rc = 0;
1826         struct target_recovery_data *trd = &obd->obd_recovery_data;
1827
1828         memset(trd, 0, sizeof(*trd));
1829         cfs_init_completion(&trd->trd_starting);
1830         cfs_init_completion(&trd->trd_finishing);
1831         trd->trd_recovery_handler = handler;
1832
1833         if (cfs_kernel_thread(target_recovery_thread, lut, 0) > 0) {
1834                 cfs_wait_for_completion(&trd->trd_starting);
1835                 LASSERT(obd->obd_recovering != 0);
1836         } else
1837                 rc = -ECHILD;
1838
1839         return rc;
1840 }
1841
1842 void target_stop_recovery_thread(struct obd_device *obd)
1843 {
1844         if (obd->obd_recovery_data.trd_processing_task > 0) {
1845                 struct target_recovery_data *trd = &obd->obd_recovery_data;
1846                 /** recovery can be done but postrecovery is not yet */
1847                 cfs_spin_lock(&obd->obd_dev_lock);
1848                 if (obd->obd_recovering) {
1849                         CERROR("%s: Aborting recovery\n", obd->obd_name);
1850                         obd->obd_abort_recovery = 1;
1851                         cfs_waitq_signal(&obd->obd_next_transno_waitq);
1852                 }
1853                 cfs_spin_unlock(&obd->obd_dev_lock);
1854                 cfs_wait_for_completion(&trd->trd_finishing);
1855         }
1856 }
1857
1858 void target_recovery_fini(struct obd_device *obd)
1859 {
1860         class_disconnect_exports(obd);
1861         target_stop_recovery_thread(obd);
1862         target_cleanup_recovery(obd);
1863 }
1864 EXPORT_SYMBOL(target_recovery_fini);
1865
1866 static void target_recovery_expired(unsigned long castmeharder)
1867 {
1868         struct obd_device *obd = (struct obd_device *)castmeharder;
1869         CDEBUG(D_HA, "%s: recovery timed out; %d clients are still in recovery"
1870                " after %lds (%d clients connected)\n",
1871                obd->obd_name, cfs_atomic_read(&obd->obd_lock_replay_clients),
1872                cfs_time_current_sec()- obd->obd_recovery_start,
1873                obd->obd_connected_clients);
1874
1875         obd->obd_recovery_expired = 1;
1876         cfs_waitq_signal(&obd->obd_next_transno_waitq);
1877 }
1878
1879 void target_recovery_init(struct lu_target *lut, svc_handler_t handler)
1880 {
1881         struct obd_device *obd = lut->lut_obd;
1882         if (obd->obd_max_recoverable_clients == 0) {
1883                 /** Update server last boot epoch */
1884                 lut_boot_epoch_update(lut);
1885                 return;
1886         }
1887
1888         CWARN("RECOVERY: service %s, %d recoverable clients, "
1889               "last_transno "LPU64"\n", obd->obd_name,
1890               obd->obd_max_recoverable_clients, obd->obd_last_committed);
1891         LASSERT(obd->obd_stopping == 0);
1892         obd->obd_next_recovery_transno = obd->obd_last_committed + 1;
1893         obd->obd_recovery_start = 0;
1894         obd->obd_recovery_end = 0;
1895
1896         /* both values can be get from mount data already */
1897         if (obd->obd_recovery_timeout == 0)
1898                 obd->obd_recovery_timeout = OBD_RECOVERY_TIME_SOFT;
1899         if (obd->obd_recovery_time_hard == 0)
1900                 obd->obd_recovery_time_hard = OBD_RECOVERY_TIME_HARD;
1901         cfs_timer_init(&obd->obd_recovery_timer, target_recovery_expired, obd);
1902         target_start_recovery_thread(lut, handler);
1903 }
1904 EXPORT_SYMBOL(target_recovery_init);
1905
1906 #endif
1907
1908 static int target_process_req_flags(struct obd_device *obd,
1909                                     struct ptlrpc_request *req)
1910 {
1911         struct obd_export *exp = req->rq_export;
1912         LASSERT(exp != NULL);
1913         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
1914                 /* client declares he's ready to replay locks */
1915                 cfs_spin_lock(&exp->exp_lock);
1916                 if (exp->exp_req_replay_needed) {
1917                         exp->exp_req_replay_needed = 0;
1918                         cfs_spin_unlock(&exp->exp_lock);
1919                         LASSERT(cfs_atomic_read(&obd->obd_req_replay_clients));
1920                         cfs_atomic_dec(&obd->obd_req_replay_clients);
1921                 } else {
1922                         cfs_spin_unlock(&exp->exp_lock);
1923                 }
1924         }
1925         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
1926                 /* client declares he's ready to complete recovery
1927                  * so, we put the request on th final queue */
1928                 cfs_spin_lock(&exp->exp_lock);
1929                 if (exp->exp_lock_replay_needed) {
1930                         exp->exp_lock_replay_needed = 0;
1931                         cfs_spin_unlock(&exp->exp_lock);
1932                         LASSERT(cfs_atomic_read(&obd->obd_lock_replay_clients));
1933                         cfs_atomic_dec(&obd->obd_lock_replay_clients);
1934                 } else {
1935                         cfs_spin_unlock(&exp->exp_lock);
1936                 }
1937         }
1938         return 0;
1939 }
1940
1941 int target_queue_recovery_request(struct ptlrpc_request *req,
1942                                   struct obd_device *obd)
1943 {
1944         cfs_list_t *tmp;
1945         int inserted = 0;
1946         __u64 transno = lustre_msg_get_transno(req->rq_reqmsg);
1947         ENTRY;
1948
1949         if (obd->obd_recovery_data.trd_processing_task == cfs_curproc_pid()) {
1950                 /* Processing the queue right now, don't re-add. */
1951                 RETURN(1);
1952         }
1953
1954         target_process_req_flags(obd, req);
1955
1956         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
1957                 /* client declares he's ready to complete recovery
1958                  * so, we put the request on th final queue */
1959                 target_request_copy_get(req);
1960                 DEBUG_REQ(D_HA, req, "queue final req");
1961                 cfs_waitq_signal(&obd->obd_next_transno_waitq);
1962                 cfs_spin_lock(&obd->obd_recovery_task_lock);
1963                 if (obd->obd_recovering) {
1964                         cfs_list_add_tail(&req->rq_list,
1965                                           &obd->obd_final_req_queue);
1966                 } else {
1967                         cfs_spin_unlock(&obd->obd_recovery_task_lock);
1968                         target_request_copy_put(req);
1969                         RETURN(obd->obd_stopping ? -ENOTCONN : 1);
1970                 }
1971                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
1972                 RETURN(0);
1973         }
1974         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
1975                 /* client declares he's ready to replay locks */
1976                 target_request_copy_get(req);
1977                 DEBUG_REQ(D_HA, req, "queue lock replay req");
1978                 cfs_waitq_signal(&obd->obd_next_transno_waitq);
1979                 cfs_spin_lock(&obd->obd_recovery_task_lock);
1980                 LASSERT(obd->obd_recovering);
1981                 /* usually due to recovery abort */
1982                 if (!req->rq_export->exp_in_recovery) {
1983                         cfs_spin_unlock(&obd->obd_recovery_task_lock);
1984                         target_request_copy_put(req);
1985                         RETURN(-ENOTCONN);
1986                 }
1987                 LASSERT(req->rq_export->exp_lock_replay_needed);
1988                 cfs_list_add_tail(&req->rq_list, &obd->obd_lock_replay_queue);
1989                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
1990                 RETURN(0);
1991         }
1992
1993         /* CAVEAT EMPTOR: The incoming request message has been swabbed
1994          * (i.e. buflens etc are in my own byte order), but type-dependent
1995          * buffers (eg mds_body, ost_body etc) have NOT been swabbed. */
1996
1997         if (!transno) {
1998                 CFS_INIT_LIST_HEAD(&req->rq_list);
1999                 DEBUG_REQ(D_HA, req, "not queueing");
2000                 RETURN(1);
2001         }
2002
2003         /* If we're processing the queue, we want don't want to queue this
2004          * message.
2005          *
2006          * Also, if this request has a transno less than the one we're waiting
2007          * for, we should process it now.  It could (and currently always will)
2008          * be an open request for a descriptor that was opened some time ago.
2009          *
2010          * Also, a resent, replayed request that has already been
2011          * handled will pass through here and be processed immediately.
2012          */
2013         CWARN("Next recovery transno: "LPU64", current: "LPU64", replaying\n",
2014               obd->obd_next_recovery_transno, transno);
2015         cfs_spin_lock(&obd->obd_recovery_task_lock);
2016         if (transno < obd->obd_next_recovery_transno) {
2017                 /* Processing the queue right now, don't re-add. */
2018                 LASSERT(cfs_list_empty(&req->rq_list));
2019                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
2020                 RETURN(1);
2021         }
2022         cfs_spin_unlock(&obd->obd_recovery_task_lock);
2023
2024         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_REPLAY_DROP))
2025                 RETURN(0);
2026
2027         target_request_copy_get(req);
2028         if (!req->rq_export->exp_in_recovery) {
2029                 target_request_copy_put(req);
2030                 RETURN(-ENOTCONN);
2031         }
2032         LASSERT(req->rq_export->exp_req_replay_needed);
2033
2034         if (target_exp_enqueue_req_replay(req)) {
2035                 DEBUG_REQ(D_ERROR, req, "dropping resent queued req");
2036                 target_request_copy_put(req);
2037                 RETURN(0);
2038         }
2039
2040         /* XXX O(n^2) */
2041         cfs_spin_lock(&obd->obd_recovery_task_lock);
2042         LASSERT(obd->obd_recovering);
2043         cfs_list_for_each(tmp, &obd->obd_req_replay_queue) {
2044                 struct ptlrpc_request *reqiter =
2045                         cfs_list_entry(tmp, struct ptlrpc_request, rq_list);
2046
2047                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) > transno) {
2048                         cfs_list_add_tail(&req->rq_list, &reqiter->rq_list);
2049                         inserted = 1;
2050                         break;
2051                 }
2052
2053                 if (unlikely(lustre_msg_get_transno(reqiter->rq_reqmsg) ==
2054                              transno)) {
2055                         DEBUG_REQ(D_ERROR, req, "dropping replay: transno "
2056                                   "has been claimed by another client");
2057                         cfs_spin_unlock(&obd->obd_recovery_task_lock);
2058                         target_exp_dequeue_req_replay(req);
2059                         target_request_copy_put(req);
2060                         RETURN(0);
2061                 }
2062         }
2063
2064         if (!inserted)
2065                 cfs_list_add_tail(&req->rq_list, &obd->obd_req_replay_queue);
2066
2067         obd->obd_requests_queued_for_recovery++;
2068         cfs_spin_unlock(&obd->obd_recovery_task_lock);
2069         cfs_waitq_signal(&obd->obd_next_transno_waitq);
2070         RETURN(0);
2071 }
2072
2073 /**
2074  * Packs current SLV and Limit into \a req.
2075  */
2076 int target_pack_pool_reply(struct ptlrpc_request *req)
2077 {
2078         struct obd_device *obd;
2079         ENTRY;
2080
2081         /*
2082          * Check that we still have all structures alive as this may
2083          * be some late rpc in shutdown time.
2084          */
2085         if (unlikely(!req->rq_export || !req->rq_export->exp_obd ||
2086                      !exp_connect_lru_resize(req->rq_export))) {
2087                 lustre_msg_set_slv(req->rq_repmsg, 0);
2088                 lustre_msg_set_limit(req->rq_repmsg, 0);
2089                 RETURN(0);
2090         }
2091
2092         /*
2093          * OBD is alive here as export is alive, which we checked above.
2094          */
2095         obd = req->rq_export->exp_obd;
2096
2097         cfs_read_lock(&obd->obd_pool_lock);
2098         lustre_msg_set_slv(req->rq_repmsg, obd->obd_pool_slv);
2099         lustre_msg_set_limit(req->rq_repmsg, obd->obd_pool_limit);
2100         cfs_read_unlock(&obd->obd_pool_lock);
2101
2102         RETURN(0);
2103 }
2104
2105 int target_send_reply_msg(struct ptlrpc_request *req, int rc, int fail_id)
2106 {
2107         if (OBD_FAIL_CHECK_ORSET(fail_id & ~OBD_FAIL_ONCE, OBD_FAIL_ONCE)) {
2108                 DEBUG_REQ(D_ERROR, req, "dropping reply");
2109                 return (-ECOMM);
2110         }
2111
2112         if (unlikely(rc)) {
2113                 DEBUG_REQ(D_ERROR, req, "processing error (%d)", rc);
2114                 req->rq_status = rc;
2115                 return (ptlrpc_send_error(req, 1));
2116         } else {
2117                 DEBUG_REQ(D_NET, req, "sending reply");
2118         }
2119
2120         return (ptlrpc_send_reply(req, PTLRPC_REPLY_MAYBE_DIFFICULT));
2121 }
2122
2123 void target_send_reply(struct ptlrpc_request *req, int rc, int fail_id)
2124 {
2125         int                        netrc;
2126         struct ptlrpc_reply_state *rs;
2127         struct obd_device         *obd;
2128         struct obd_export         *exp;
2129         struct ptlrpc_service     *svc;
2130         ENTRY;
2131
2132         if (req->rq_no_reply) {
2133                 EXIT;
2134                 return;
2135         }
2136
2137         svc = req->rq_rqbd->rqbd_service;
2138         rs = req->rq_reply_state;
2139         if (rs == NULL || !rs->rs_difficult) {
2140                 /* no notifiers */
2141                 target_send_reply_msg (req, rc, fail_id);
2142                 EXIT;
2143                 return;
2144         }
2145
2146         /* must be an export if locks saved */
2147         LASSERT (req->rq_export != NULL);
2148         /* req/reply consistent */
2149         LASSERT (rs->rs_service == svc);
2150
2151         /* "fresh" reply */
2152         LASSERT (!rs->rs_scheduled);
2153         LASSERT (!rs->rs_scheduled_ever);
2154         LASSERT (!rs->rs_handled);
2155         LASSERT (!rs->rs_on_net);
2156         LASSERT (rs->rs_export == NULL);
2157         LASSERT (cfs_list_empty(&rs->rs_obd_list));
2158         LASSERT (cfs_list_empty(&rs->rs_exp_list));
2159
2160         exp = class_export_get (req->rq_export);
2161         obd = exp->exp_obd;
2162
2163         /* disable reply scheduling while I'm setting up */
2164         rs->rs_scheduled = 1;
2165         rs->rs_on_net    = 1;
2166         rs->rs_xid       = req->rq_xid;
2167         rs->rs_transno   = req->rq_transno;
2168         rs->rs_export    = exp;
2169         rs->rs_opc       = lustre_msg_get_opc(rs->rs_msg);
2170
2171         cfs_spin_lock(&exp->exp_uncommitted_replies_lock);
2172         CDEBUG(D_NET, "rs transno = "LPU64", last committed = "LPU64"\n",
2173                rs->rs_transno, exp->exp_last_committed);
2174         if (rs->rs_transno > exp->exp_last_committed) {
2175                 /* not committed already */
2176                 cfs_list_add_tail(&rs->rs_obd_list,
2177                                   &exp->exp_uncommitted_replies);
2178         }
2179         cfs_spin_unlock (&exp->exp_uncommitted_replies_lock);
2180
2181         cfs_spin_lock(&exp->exp_lock);
2182         cfs_list_add_tail(&rs->rs_exp_list, &exp->exp_outstanding_replies);
2183         cfs_spin_unlock(&exp->exp_lock);
2184
2185         netrc = target_send_reply_msg (req, rc, fail_id);
2186
2187         cfs_spin_lock(&svc->srv_rs_lock);
2188
2189         cfs_atomic_inc(&svc->srv_n_difficult_replies);
2190
2191         if (netrc != 0) {
2192                 /* error sending: reply is off the net.  Also we need +1
2193                  * reply ref until ptlrpc_handle_rs() is done
2194                  * with the reply state (if the send was successful, there
2195                  * would have been +1 ref for the net, which
2196                  * reply_out_callback leaves alone) */
2197                 rs->rs_on_net = 0;
2198                 ptlrpc_rs_addref(rs);
2199         }
2200
2201         cfs_spin_lock(&rs->rs_lock);
2202         if (rs->rs_transno <= exp->exp_last_committed ||
2203             (!rs->rs_on_net && !rs->rs_no_ack) ||
2204              cfs_list_empty(&rs->rs_exp_list) ||     /* completed already */
2205              cfs_list_empty(&rs->rs_obd_list)) {
2206                 CDEBUG(D_HA, "Schedule reply immediately\n");
2207                 ptlrpc_dispatch_difficult_reply(rs);
2208         } else {
2209                 cfs_list_add (&rs->rs_list, &svc->srv_active_replies);
2210                 rs->rs_scheduled = 0;           /* allow notifier to schedule */
2211         }
2212         cfs_spin_unlock(&rs->rs_lock);
2213         cfs_spin_unlock(&svc->srv_rs_lock);
2214         EXIT;
2215 }
2216
2217 int target_handle_ping(struct ptlrpc_request *req)
2218 {
2219         obd_ping(req->rq_export);
2220         return req_capsule_server_pack(&req->rq_pill);
2221 }
2222
2223 void target_committed_to_req(struct ptlrpc_request *req)
2224 {
2225         struct obd_export *exp = req->rq_export;
2226
2227         if (!exp->exp_obd->obd_no_transno && req->rq_repmsg != NULL)
2228                 lustre_msg_set_last_committed(req->rq_repmsg,
2229                                               exp->exp_last_committed);
2230         else
2231                 DEBUG_REQ(D_IOCTL, req, "not sending last_committed update (%d/"
2232                           "%d)", exp->exp_obd->obd_no_transno,
2233                           req->rq_repmsg == NULL);
2234
2235         CDEBUG(D_INFO, "last_committed "LPU64", transno "LPU64", xid "LPU64"\n",
2236                exp->exp_last_committed, req->rq_transno, req->rq_xid);
2237 }
2238 EXPORT_SYMBOL(target_committed_to_req);
2239
2240 int target_handle_qc_callback(struct ptlrpc_request *req)
2241 {
2242         struct obd_quotactl *oqctl;
2243         struct client_obd *cli = &req->rq_export->exp_obd->u.cli;
2244
2245         oqctl = req_capsule_client_get(&req->rq_pill, &RMF_OBD_QUOTACTL);
2246         if (oqctl == NULL) {
2247                 CERROR("Can't unpack obd_quotactl\n");
2248                 RETURN(-EPROTO);
2249         }
2250
2251         cli->cl_qchk_stat = oqctl->qc_stat;
2252
2253         return 0;
2254 }
2255
2256 #ifdef HAVE_QUOTA_SUPPORT
2257 int target_handle_dqacq_callback(struct ptlrpc_request *req)
2258 {
2259 #ifdef __KERNEL__
2260         struct obd_device *obd = req->rq_export->exp_obd;
2261         struct obd_device *master_obd = NULL, *lov_obd = NULL;
2262         struct obd_device_target *obt;
2263         struct lustre_quota_ctxt *qctxt;
2264         struct qunit_data *qdata = NULL;
2265         int rc = 0;
2266         ENTRY;
2267
2268         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_DROP_QUOTA_REQ))
2269                 RETURN(rc);
2270
2271         rc = req_capsule_server_pack(&req->rq_pill);
2272         if (rc) {
2273                 CERROR("packing reply failed!: rc = %d\n", rc);
2274                 RETURN(rc);
2275         }
2276
2277         LASSERT(req->rq_export);
2278
2279         qdata = quota_get_qdata(req, QUOTA_REQUEST, QUOTA_EXPORT);
2280         if (IS_ERR(qdata)) {
2281                 rc = PTR_ERR(qdata);
2282                 CDEBUG(D_ERROR, "Can't unpack qunit_data(rc: %d)\n", rc);
2283                 req->rq_status = rc;
2284                 GOTO(out, rc);
2285         }
2286
2287         /* we use the observer */
2288         if (obd_pin_observer(obd, &lov_obd) ||
2289             obd_pin_observer(lov_obd, &master_obd)) {
2290                 CERROR("Can't find the observer, it is recovering\n");
2291                 req->rq_status = -EAGAIN;
2292                 GOTO(out, rc);
2293         }
2294
2295         obt = &master_obd->u.obt;
2296         qctxt = &obt->obt_qctxt;
2297
2298         if (!qctxt->lqc_setup || !qctxt->lqc_valid) {
2299                 /* quota_type has not been processed yet, return EAGAIN
2300                  * until we know whether or not quotas are supposed to
2301                  * be enabled */
2302                 CDEBUG(D_QUOTA, "quota_type not processed yet, return "
2303                        "-EAGAIN\n");
2304                 req->rq_status = -EAGAIN;
2305                 GOTO(out, rc);
2306         }
2307
2308         cfs_down_read(&obt->obt_rwsem);
2309         if (qctxt->lqc_lqs_hash == NULL) {
2310                 cfs_up_read(&obt->obt_rwsem);
2311                 /* quota_type has not been processed yet, return EAGAIN
2312                  * until we know whether or not quotas are supposed to
2313                  * be enabled */
2314                 CDEBUG(D_QUOTA, "quota_ctxt is not ready yet, return "
2315                        "-EAGAIN\n");
2316                 req->rq_status = -EAGAIN;
2317                 GOTO(out, rc);
2318         }
2319
2320         LASSERT(qctxt->lqc_handler);
2321         rc = qctxt->lqc_handler(master_obd, qdata,
2322                                 lustre_msg_get_opc(req->rq_reqmsg));
2323         cfs_up_read(&obt->obt_rwsem);
2324         if (rc && rc != -EDQUOT)
2325                 CDEBUG(rc == -EBUSY  ? D_QUOTA : D_ERROR,
2326                        "dqacq/dqrel failed! (rc:%d)\n", rc);
2327         req->rq_status = rc;
2328
2329         rc = quota_copy_qdata(req, qdata, QUOTA_REPLY, QUOTA_EXPORT);
2330         if (rc < 0) {
2331                 CERROR("Can't pack qunit_data(rc: %d)\n", rc);
2332                 GOTO(out, rc);
2333         }
2334
2335         /* Block the quota req. b=14840 */
2336         OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_BLOCK_QUOTA_REQ, obd_timeout);
2337         EXIT;
2338
2339 out:
2340         if (master_obd)
2341                 obd_unpin_observer(lov_obd);
2342         if (lov_obd)
2343                 obd_unpin_observer(obd);
2344
2345         rc = ptlrpc_reply(req);
2346         return rc;
2347 #else
2348         return 0;
2349 #endif /* !__KERNEL__ */
2350 }
2351 #endif /* HAVE_QUOTA_SUPPORT */
2352
2353 ldlm_mode_t lck_compat_array[] = {
2354         [LCK_EX] LCK_COMPAT_EX,
2355         [LCK_PW] LCK_COMPAT_PW,
2356         [LCK_PR] LCK_COMPAT_PR,
2357         [LCK_CW] LCK_COMPAT_CW,
2358         [LCK_CR] LCK_COMPAT_CR,
2359         [LCK_NL] LCK_COMPAT_NL,
2360         [LCK_GROUP] LCK_COMPAT_GROUP,
2361         [LCK_COS] LCK_COMPAT_COS,
2362 };
2363
2364 /**
2365  * Rather arbitrary mapping from LDLM error codes to errno values. This should
2366  * not escape to the user level.
2367  */
2368 int ldlm_error2errno(ldlm_error_t error)
2369 {
2370         int result;
2371
2372         switch (error) {
2373         case ELDLM_OK:
2374                 result = 0;
2375                 break;
2376         case ELDLM_LOCK_CHANGED:
2377                 result = -ESTALE;
2378                 break;
2379         case ELDLM_LOCK_ABORTED:
2380                 result = -ENAVAIL;
2381                 break;
2382         case ELDLM_LOCK_REPLACED:
2383                 result = -ESRCH;
2384                 break;
2385         case ELDLM_NO_LOCK_DATA:
2386                 result = -ENOENT;
2387                 break;
2388         case ELDLM_NAMESPACE_EXISTS:
2389                 result = -EEXIST;
2390                 break;
2391         case ELDLM_BAD_NAMESPACE:
2392                 result = -EBADF;
2393                 break;
2394         default:
2395                 if (((int)error) < 0)  /* cast to signed type */
2396                         result = error; /* as ldlm_error_t can be unsigned */
2397                 else {
2398                         CERROR("Invalid DLM result code: %d\n", error);
2399                         result = -EPROTO;
2400                 }
2401         }
2402         return result;
2403 }
2404 EXPORT_SYMBOL(ldlm_error2errno);
2405
2406 /**
2407  * Dual to ldlm_error2errno(): maps errno values back to ldlm_error_t.
2408  */
2409 ldlm_error_t ldlm_errno2error(int err_no)
2410 {
2411         int error;
2412
2413         switch (err_no) {
2414         case 0:
2415                 error = ELDLM_OK;
2416                 break;
2417         case -ESTALE:
2418                 error = ELDLM_LOCK_CHANGED;
2419                 break;
2420         case -ENAVAIL:
2421                 error = ELDLM_LOCK_ABORTED;
2422                 break;
2423         case -ESRCH:
2424                 error = ELDLM_LOCK_REPLACED;
2425                 break;
2426         case -ENOENT:
2427                 error = ELDLM_NO_LOCK_DATA;
2428                 break;
2429         case -EEXIST:
2430                 error = ELDLM_NAMESPACE_EXISTS;
2431                 break;
2432         case -EBADF:
2433                 error = ELDLM_BAD_NAMESPACE;
2434                 break;
2435         default:
2436                 error = err_no;
2437         }
2438         return error;
2439 }
2440 EXPORT_SYMBOL(ldlm_errno2error);
2441
2442 #if LUSTRE_TRACKS_LOCK_EXP_REFS
2443 void ldlm_dump_export_locks(struct obd_export *exp)
2444 {
2445         cfs_spin_lock(&exp->exp_locks_list_guard);
2446         if (!cfs_list_empty(&exp->exp_locks_list)) {
2447             struct ldlm_lock *lock;
2448
2449             CERROR("dumping locks for export %p,"
2450                    "ignore if the unmount doesn't hang\n", exp);
2451             cfs_list_for_each_entry(lock, &exp->exp_locks_list, l_exp_refs_link)
2452                 ldlm_lock_dump(D_ERROR, lock, 0);
2453         }
2454         cfs_spin_unlock(&exp->exp_locks_list_guard);
2455 }
2456 #endif