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[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_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_lock);
577         }
578         cfs_spin_unlock(&exp->exp_lock);
579
580         /* release nid stat refererence */
581         lprocfs_exp_cleanup(exp);
582
583         RETURN(rc);
584 }
585
586 /* --------------------------------------------------------------------------
587  * from old lib/target.c
588  * -------------------------------------------------------------------------- */
589
590 static int target_handle_reconnect(struct lustre_handle *conn,
591                                    struct obd_export *exp,
592                                    struct obd_uuid *cluuid)
593 {
594         ENTRY;
595         if (exp->exp_connection && exp->exp_imp_reverse) {
596                 struct lustre_handle *hdl;
597                 hdl = &exp->exp_imp_reverse->imp_remote_handle;
598                 /* Might be a re-connect after a partition. */
599                 if (!memcmp(&conn->cookie, &hdl->cookie, sizeof conn->cookie)) {
600                         CWARN("%s: %s reconnecting\n", exp->exp_obd->obd_name,
601                               cluuid->uuid);
602                         conn->cookie = exp->exp_handle.h_cookie;
603                         /* target_handle_connect() treats EALREADY and
604                          * -EALREADY differently.  EALREADY means we are
605                          * doing a valid reconnect from the same client. */
606                         RETURN(EALREADY);
607                 } else {
608                         CERROR("%s reconnecting from %s, "
609                                "handle mismatch (ours "LPX64", theirs "
610                                LPX64")\n", cluuid->uuid,
611                                exp->exp_connection->c_remote_uuid.uuid,
612                                hdl->cookie, conn->cookie);
613                         memset(conn, 0, sizeof *conn);
614                         /* target_handle_connect() treats EALREADY and
615                          * -EALREADY differently.  -EALREADY is an error
616                          * (same UUID, different handle). */
617                         RETURN(-EALREADY);
618                 }
619         }
620
621         conn->cookie = exp->exp_handle.h_cookie;
622         CDEBUG(D_HA, "connect export for UUID '%s' at %p, cookie "LPX64"\n",
623                cluuid->uuid, exp, conn->cookie);
624         RETURN(0);
625 }
626
627 void target_client_add_cb(struct obd_device *obd, __u64 transno, void *cb_data,
628                           int error)
629 {
630         struct obd_export *exp = cb_data;
631
632         CDEBUG(D_RPCTRACE, "%s: committing for initial connect of %s\n",
633                obd->obd_name, exp->exp_client_uuid.uuid);
634
635         cfs_spin_lock(&exp->exp_lock);
636         exp->exp_need_sync = 0;
637         cfs_spin_unlock(&exp->exp_lock);
638         class_export_cb_put(exp);
639 }
640 EXPORT_SYMBOL(target_client_add_cb);
641
642 static void
643 target_start_and_reset_recovery_timer(struct obd_device *obd,
644                                       struct ptlrpc_request *req,
645                                       int new_client);
646
647 int target_handle_connect(struct ptlrpc_request *req)
648 {
649         struct obd_device *target, *targref = NULL;
650         struct obd_export *export = NULL;
651         struct obd_import *revimp;
652         struct lustre_handle conn;
653         struct lustre_handle *tmp;
654         struct obd_uuid tgtuuid;
655         struct obd_uuid cluuid;
656         struct obd_uuid remote_uuid;
657         char *str;
658         int rc = 0;
659         int mds_conn = 0;
660         struct obd_connect_data *data, *tmpdata;
661         lnet_nid_t *client_nid = NULL;
662         ENTRY;
663
664         OBD_RACE(OBD_FAIL_TGT_CONN_RACE);
665
666         str = req_capsule_client_get(&req->rq_pill, &RMF_TGTUUID);
667         if (str == NULL) {
668                 DEBUG_REQ(D_ERROR, req, "bad target UUID for connect");
669                 GOTO(out, rc = -EINVAL);
670         }
671
672         obd_str2uuid(&tgtuuid, str);
673         target = class_uuid2obd(&tgtuuid);
674         if (!target)
675                 target = class_name2obd(str);
676
677         if (!target || target->obd_stopping || !target->obd_set_up) {
678                 LCONSOLE_ERROR_MSG(0x137, "UUID '%s' is not available "
679                                    " for connect (%s)\n", str,
680                                    !target ? "no target" :
681                                    (target->obd_stopping ? "stopping" :
682                                    "not set up"));
683                 GOTO(out, rc = -ENODEV);
684         }
685
686         if (target->obd_no_conn) {
687                 LCONSOLE_WARN("%s: temporarily refusing client connection "
688                               "from %s\n", target->obd_name,
689                               libcfs_nid2str(req->rq_peer.nid));
690                 GOTO(out, rc = -EAGAIN);
691         }
692
693         /* Make sure the target isn't cleaned up while we're here. Yes,
694            there's still a race between the above check and our incref here.
695            Really, class_uuid2obd should take the ref. */
696         targref = class_incref(target, __FUNCTION__, cfs_current());
697
698
699         str = req_capsule_client_get(&req->rq_pill, &RMF_CLUUID);
700         if (str == NULL) {
701                 DEBUG_REQ(D_ERROR, req, "bad client UUID for connect");
702                 GOTO(out, rc = -EINVAL);
703         }
704
705         obd_str2uuid(&cluuid, str);
706
707         /* XXX extract a nettype and format accordingly */
708         switch (sizeof(lnet_nid_t)) {
709                 /* NB the casts only avoid compiler warnings */
710         case 8:
711                 snprintf(remote_uuid.uuid, sizeof remote_uuid,
712                          "NET_"LPX64"_UUID", (__u64)req->rq_peer.nid);
713                 break;
714         case 4:
715                 snprintf(remote_uuid.uuid, sizeof remote_uuid,
716                          "NET_%x_UUID", (__u32)req->rq_peer.nid);
717                 break;
718         default:
719                 LBUG();
720         }
721
722         tmp = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
723         if (tmp == NULL)
724                 GOTO(out, rc = -EPROTO);
725
726         conn = *tmp;
727
728         data = req_capsule_client_get(&req->rq_pill, &RMF_CONNECT_DATA);
729         if (!data)
730                 GOTO(out, rc = -EPROTO);
731
732         rc = req_capsule_server_pack(&req->rq_pill);
733         if (rc)
734                 GOTO(out, rc);
735
736         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
737                 if (!data) {
738                         DEBUG_REQ(D_WARNING, req, "Refusing old (unversioned) "
739                                   "libclient connection attempt");
740                         GOTO(out, rc = -EPROTO);
741                 } else if (data->ocd_version < LUSTRE_VERSION_CODE -
742                                                LUSTRE_VERSION_ALLOWED_OFFSET ||
743                            data->ocd_version > LUSTRE_VERSION_CODE +
744                                                LUSTRE_VERSION_ALLOWED_OFFSET) {
745                         DEBUG_REQ(D_WARNING, req, "Refusing %s (%d.%d.%d.%d) "
746                                   "libclient connection attempt",
747                                   data->ocd_version < LUSTRE_VERSION_CODE ?
748                                   "old" : "new",
749                                   OBD_OCD_VERSION_MAJOR(data->ocd_version),
750                                   OBD_OCD_VERSION_MINOR(data->ocd_version),
751                                   OBD_OCD_VERSION_PATCH(data->ocd_version),
752                                   OBD_OCD_VERSION_FIX(data->ocd_version));
753                         data = req_capsule_server_sized_get(&req->rq_pill,
754                                                         &RMF_CONNECT_DATA,
755                                     offsetof(typeof(*data), ocd_version) +
756                                              sizeof(data->ocd_version));
757                         if (data) {
758                                 data->ocd_connect_flags = OBD_CONNECT_VERSION;
759                                 data->ocd_version = LUSTRE_VERSION_CODE;
760                         }
761                         GOTO(out, rc = -EPROTO);
762                 }
763         }
764
765         if ((lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_INITIAL) &&
766             (data->ocd_connect_flags & OBD_CONNECT_MDS))
767                 mds_conn = 1;
768
769         /* lctl gets a backstage, all-access pass. */
770         if (obd_uuid_equals(&cluuid, &target->obd_uuid))
771                 goto dont_check_exports;
772
773         export = cfs_hash_lookup(target->obd_uuid_hash, &cluuid);
774         if (!export)
775                 goto no_export;
776
777         /* we've found an export in the hash */
778         if (export->exp_connecting) { /* bug 9635, et. al. */
779                 CWARN("%s: exp %p already connecting\n",
780                       export->exp_obd->obd_name, export);
781                 class_export_put(export);
782                 export = NULL;
783                 rc = -EALREADY;
784         } else if (mds_conn && export->exp_connection) {
785                 if (req->rq_peer.nid != export->exp_connection->c_peer.nid)
786                         /* mds reconnected after failover */
787                         CWARN("%s: received MDS connection from NID %s,"
788                               " removing former export from NID %s\n",
789                             target->obd_name, libcfs_nid2str(req->rq_peer.nid),
790                             libcfs_nid2str(export->exp_connection->c_peer.nid));
791                 else
792                         /* new mds connection from the same nid */
793                         CWARN("%s: received new MDS connection from NID %s,"
794                               " removing former export from same NID\n",
795                             target->obd_name, libcfs_nid2str(req->rq_peer.nid));
796                 class_fail_export(export);
797                 class_export_put(export);
798                 export = NULL;
799                 rc = 0;
800         } else if (export->exp_connection != NULL &&
801                    req->rq_peer.nid != export->exp_connection->c_peer.nid &&
802                    (lustre_msg_get_op_flags(req->rq_reqmsg) &
803                     MSG_CONNECT_INITIAL)) {
804                 /* in mds failover we have static uuid but nid can be
805                  * changed*/
806                 CWARN("%s: cookie %s seen on new NID %s when "
807                       "existing NID %s is already connected\n",
808                       target->obd_name, cluuid.uuid,
809                       libcfs_nid2str(req->rq_peer.nid),
810                       libcfs_nid2str(export->exp_connection->c_peer.nid));
811                 rc = -EALREADY;
812                 class_export_put(export);
813                 export = NULL;
814         } else {
815                 cfs_spin_lock(&export->exp_lock);
816                 export->exp_connecting = 1;
817                 cfs_spin_unlock(&export->exp_lock);
818                 class_export_put(export);
819                 LASSERT(export->exp_obd == target);
820
821                 rc = target_handle_reconnect(&conn, export, &cluuid);
822         }
823
824         /* If we found an export, we already unlocked. */
825         if (!export) {
826 no_export:
827                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_CONNECT, 2 * obd_timeout);
828         } else if (req->rq_export == NULL &&
829                    cfs_atomic_read(&export->exp_rpc_count) > 0) {
830                 CWARN("%s: refuse connection from %s/%s to 0x%p/%d\n",
831                       target->obd_name, cluuid.uuid,
832                       libcfs_nid2str(req->rq_peer.nid),
833                       export, cfs_atomic_read(&export->exp_refcount));
834                 GOTO(out, rc = -EBUSY);
835         } else if (req->rq_export != NULL &&
836                    (cfs_atomic_read(&export->exp_rpc_count) > 1)) {
837                 /* the current connect rpc has increased exp_rpc_count */
838                 CWARN("%s: refuse reconnection from %s@%s to 0x%p/%d\n",
839                       target->obd_name, cluuid.uuid,
840                       libcfs_nid2str(req->rq_peer.nid),
841                       export, cfs_atomic_read(&export->exp_rpc_count) - 1);
842                 cfs_spin_lock(&export->exp_lock);
843                 if (req->rq_export->exp_conn_cnt <
844                     lustre_msg_get_conn_cnt(req->rq_reqmsg))
845                         /* try to abort active requests */
846                         req->rq_export->exp_abort_active_req = 1;
847                 cfs_spin_unlock(&export->exp_lock);
848                 GOTO(out, rc = -EBUSY);
849         } else if (lustre_msg_get_conn_cnt(req->rq_reqmsg) == 1) {
850                 CERROR("%s: NID %s (%s) reconnected with 1 conn_cnt; "
851                        "cookies not random?\n", target->obd_name,
852                        libcfs_nid2str(req->rq_peer.nid), cluuid.uuid);
853                 GOTO(out, rc = -EALREADY);
854         } else {
855                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_RECONNECT, 2 * obd_timeout);
856         }
857
858         if (rc < 0) {
859                 GOTO(out, rc);
860         }
861
862         CWARN("%s: connection from %s@%s %st"LPU64" exp %p cur %ld last %ld\n",
863                target->obd_name, cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
864               target->obd_recovering ? "recovering/" : "", data->ocd_transno,
865               export, (long)cfs_time_current_sec(),
866               export ? (long)export->exp_last_request_time : 0);
867
868         /* Tell the client if we're in recovery. */
869         if (target->obd_recovering) {
870                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECOVERING);
871                 /* If this is the first time a client connects,
872                    reset the recovery timer */
873                 if (rc == 0)
874                         target_start_and_reset_recovery_timer(target, req,
875                                                               !export);
876         }
877
878         /* We want to handle EALREADY but *not* -EALREADY from
879          * target_handle_reconnect(), return reconnection state in a flag */
880         if (rc == EALREADY) {
881                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECONNECT);
882                 rc = 0;
883         } else {
884                 LASSERT(rc == 0);
885         }
886
887         /* Tell the client if we support replayable requests */
888         if (target->obd_replayable)
889                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_REPLAYABLE);
890         client_nid = &req->rq_peer.nid;
891
892         if (export == NULL) {
893                 if (target->obd_recovering) {
894                         cfs_time_t t;
895
896                         t = cfs_timer_deadline(&target->obd_recovery_timer);
897                         t = cfs_time_sub(t, cfs_time_current());
898                         CERROR("%s: denying connection for new client %s (%s): "
899                                "%d clients in recovery for "CFS_TIME_T"s\n",
900                                target->obd_name,
901                                libcfs_nid2str(req->rq_peer.nid), cluuid.uuid,
902                                cfs_atomic_read(&target-> \
903                                                obd_lock_replay_clients),
904                                cfs_duration_sec(t));
905                         rc = -EBUSY;
906                 } else {
907 dont_check_exports:
908                         rc = obd_connect(req->rq_svc_thread->t_env,
909                                          &export, target, &cluuid, data,
910                                          client_nid);
911                         if (rc == 0)
912                                 conn.cookie = export->exp_handle.h_cookie;
913                 }
914         } else {
915                 rc = obd_reconnect(req->rq_svc_thread->t_env,
916                                    export, target, &cluuid, data, client_nid);
917                 if (rc == 0)
918                         /* prevous done via class_conn2export */
919                         class_export_get(export);
920         }
921         if (rc)
922                 GOTO(out, rc);
923         /* Return only the parts of obd_connect_data that we understand, so the
924          * client knows that we don't understand the rest. */
925         if (data) {
926                  tmpdata = req_capsule_server_get(&req->rq_pill,
927                                                   &RMF_CONNECT_DATA);
928                   //data->ocd_connect_flags &= OBD_CONNECT_SUPPORTED;
929                  *tmpdata = *data;
930         }
931
932         /* If all else goes well, this is our RPC return code. */
933         req->rq_status = 0;
934
935         lustre_msg_set_handle(req->rq_repmsg, &conn);
936
937         /* If the client and the server are the same node, we will already
938          * have an export that really points to the client's DLM export,
939          * because we have a shared handles table.
940          *
941          * XXX this will go away when shaver stops sending the "connect" handle
942          * in the real "remote handle" field of the request --phik 24 Apr 2003
943          */
944         if (req->rq_export != NULL)
945                 class_export_put(req->rq_export);
946
947         req->rq_export = export;
948
949         cfs_spin_lock(&export->exp_lock);
950         if (export->exp_conn_cnt >= lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
951                 cfs_spin_unlock(&export->exp_lock);
952                 CERROR("%s: %s already connected at higher conn_cnt: %d > %d\n",
953                        cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
954                        export->exp_conn_cnt,
955                        lustre_msg_get_conn_cnt(req->rq_reqmsg));
956
957                 GOTO(out, rc = -EALREADY);
958         }
959         LASSERT(lustre_msg_get_conn_cnt(req->rq_reqmsg) > 0);
960         export->exp_conn_cnt = lustre_msg_get_conn_cnt(req->rq_reqmsg);
961         export->exp_abort_active_req = 0;
962
963         /* request from liblustre?  Don't evict it for not pinging. */
964         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
965                 export->exp_libclient = 1;
966                 cfs_spin_unlock(&export->exp_lock);
967
968                 cfs_spin_lock(&target->obd_dev_lock);
969                 cfs_list_del_init(&export->exp_obd_chain_timed);
970                 cfs_spin_unlock(&target->obd_dev_lock);
971         } else {
972                 cfs_spin_unlock(&export->exp_lock);
973         }
974
975         if (export->exp_connection != NULL) {
976                 /* Check to see if connection came from another NID */
977                 if ((export->exp_connection->c_peer.nid != req->rq_peer.nid) &&
978                     !cfs_hlist_unhashed(&export->exp_nid_hash))
979                         cfs_hash_del(export->exp_obd->obd_nid_hash,
980                                      &export->exp_connection->c_peer.nid,
981                                      &export->exp_nid_hash);
982
983                 ptlrpc_connection_put(export->exp_connection);
984         }
985
986         export->exp_connection = ptlrpc_connection_get(req->rq_peer,
987                                                        req->rq_self,
988                                                        &remote_uuid);
989         if (cfs_hlist_unhashed(&export->exp_nid_hash)) {
990                 cfs_hash_add(export->exp_obd->obd_nid_hash,
991                              &export->exp_connection->c_peer.nid,
992                              &export->exp_nid_hash);
993         }
994
995         cfs_spin_lock(&target->obd_recovery_task_lock);
996         if (target->obd_recovering && !export->exp_in_recovery) {
997                 cfs_spin_lock(&export->exp_lock);
998                 export->exp_in_recovery = 1;
999                 export->exp_req_replay_needed = 1;
1000                 export->exp_lock_replay_needed = 1;
1001                 cfs_spin_unlock(&export->exp_lock);
1002                 if ((lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_TRANSNO)
1003                      && (data->ocd_transno == 0))
1004                         CWARN("Connect with zero transno!\n");
1005
1006                 if ((lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_TRANSNO)
1007                      && data->ocd_transno < target->obd_next_recovery_transno)
1008                         target->obd_next_recovery_transno = data->ocd_transno;
1009                 target->obd_connected_clients++;
1010                 cfs_atomic_inc(&target->obd_req_replay_clients);
1011                 cfs_atomic_inc(&target->obd_lock_replay_clients);
1012                 if (target->obd_connected_clients ==
1013                     target->obd_max_recoverable_clients)
1014                         cfs_waitq_signal(&target->obd_next_transno_waitq);
1015         }
1016         cfs_spin_unlock(&target->obd_recovery_task_lock);
1017         tmp = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
1018         conn = *tmp;
1019
1020         if (export->exp_imp_reverse != NULL) {
1021                 /* destroyed import can be still referenced in ctxt */
1022                 obd_set_info_async(export, sizeof(KEY_REVIMP_UPD),
1023                                    KEY_REVIMP_UPD, 0, NULL, NULL);
1024
1025                 client_destroy_import(export->exp_imp_reverse);
1026         }
1027
1028         /* for the rest part, we return -ENOTCONN in case of errors
1029          * in order to let client initialize connection again.
1030          */
1031         revimp = export->exp_imp_reverse = class_new_import(target);
1032         if (!revimp) {
1033                 CERROR("fail to alloc new reverse import.\n");
1034                 GOTO(out, rc = -ENOTCONN);
1035         }
1036
1037         revimp->imp_connection = ptlrpc_connection_addref(export->exp_connection);
1038         revimp->imp_client = &export->exp_obd->obd_ldlm_client;
1039         revimp->imp_remote_handle = conn;
1040         revimp->imp_dlm_fake = 1;
1041         revimp->imp_state = LUSTRE_IMP_FULL;
1042
1043         /* unknown versions will be caught in
1044          * ptlrpc_handle_server_req_in->lustre_unpack_msg() */
1045         revimp->imp_msg_magic = req->rq_reqmsg->lm_magic;
1046
1047         if ((export->exp_connect_flags & OBD_CONNECT_AT) &&
1048             (revimp->imp_msg_magic != LUSTRE_MSG_MAGIC_V1))
1049                 revimp->imp_msghdr_flags |= MSGHDR_AT_SUPPORT;
1050         else
1051                 revimp->imp_msghdr_flags &= ~MSGHDR_AT_SUPPORT;
1052
1053         if ((export->exp_connect_flags & OBD_CONNECT_FULL20) &&
1054             (revimp->imp_msg_magic != LUSTRE_MSG_MAGIC_V1))
1055                 revimp->imp_msghdr_flags |= MSGHDR_CKSUM_INCOMPAT18;
1056         else
1057                 revimp->imp_msghdr_flags &= ~MSGHDR_CKSUM_INCOMPAT18;
1058
1059         rc = sptlrpc_import_sec_adapt(revimp, req->rq_svc_ctx, &req->rq_flvr);
1060         if (rc) {
1061                 CERROR("Failed to get sec for reverse import: %d\n", rc);
1062                 export->exp_imp_reverse = NULL;
1063                 class_destroy_import(revimp);
1064         }
1065
1066         class_import_put(revimp);
1067 out:
1068         if (export) {
1069                 cfs_spin_lock(&export->exp_lock);
1070                 export->exp_connecting = 0;
1071                 cfs_spin_unlock(&export->exp_lock);
1072         }
1073         if (targref)
1074                 class_decref(targref, __FUNCTION__, cfs_current());
1075         if (rc)
1076                 req->rq_status = rc;
1077         RETURN(rc);
1078 }
1079
1080 int target_handle_disconnect(struct ptlrpc_request *req)
1081 {
1082         int rc;
1083         ENTRY;
1084
1085         rc = req_capsule_server_pack(&req->rq_pill);
1086         if (rc)
1087                 RETURN(rc);
1088
1089         /* keep the rq_export around so we can send the reply */
1090         req->rq_status = obd_disconnect(class_export_get(req->rq_export));
1091
1092         RETURN(0);
1093 }
1094
1095 void target_destroy_export(struct obd_export *exp)
1096 {
1097         /* exports created from last_rcvd data, and "fake"
1098            exports created by lctl don't have an import */
1099         if (exp->exp_imp_reverse != NULL)
1100                 client_destroy_import(exp->exp_imp_reverse);
1101
1102         LASSERT(cfs_atomic_read(&exp->exp_locks_count) == 0);
1103         LASSERT(cfs_atomic_read(&exp->exp_rpc_count) == 0);
1104         LASSERT(cfs_atomic_read(&exp->exp_cb_count) == 0);
1105         LASSERT(cfs_atomic_read(&exp->exp_replay_count) == 0);
1106 }
1107
1108 /*
1109  * Recovery functions
1110  */
1111 static void target_request_copy_get(struct ptlrpc_request *req)
1112 {
1113         class_export_rpc_get(req->rq_export);
1114         LASSERT(cfs_list_empty(&req->rq_list));
1115         CFS_INIT_LIST_HEAD(&req->rq_replay_list);
1116         /* increase refcount to keep request in queue */
1117         LASSERT(cfs_atomic_read(&req->rq_refcount));
1118         cfs_atomic_inc(&req->rq_refcount);
1119         /** let export know it has replays to be handled */
1120         cfs_atomic_inc(&req->rq_export->exp_replay_count);
1121         /* release service thread while request is queued 
1122          * we are moving the request from active processing
1123          * to waiting on the replay queue */
1124         ptlrpc_server_active_request_dec(req);
1125 }
1126
1127 static void target_request_copy_put(struct ptlrpc_request *req)
1128 {
1129         LASSERT(cfs_list_empty(&req->rq_replay_list));
1130         LASSERT(cfs_atomic_read(&req->rq_export->exp_replay_count) > 0);
1131         cfs_atomic_dec(&req->rq_export->exp_replay_count);
1132         class_export_rpc_put(req->rq_export);
1133         /* ptlrpc_server_drop_request() assumes the request is active */
1134         ptlrpc_server_active_request_inc(req);
1135         ptlrpc_server_drop_request(req);
1136 }
1137
1138 static int target_exp_enqueue_req_replay(struct ptlrpc_request *req)
1139 {
1140         __u64                  transno = lustre_msg_get_transno(req->rq_reqmsg);
1141         struct obd_export     *exp = req->rq_export;
1142         struct ptlrpc_request *reqiter;
1143         int                    dup = 0;
1144
1145         LASSERT(exp);
1146
1147         cfs_spin_lock(&exp->exp_lock);
1148         cfs_list_for_each_entry(reqiter, &exp->exp_req_replay_queue,
1149                                 rq_replay_list) {
1150                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) == transno) {
1151                         dup = 1;
1152                         break;
1153                 }
1154         }
1155
1156         if (dup) {
1157                 /* we expect it with RESENT and REPLAY flags */
1158                 if ((lustre_msg_get_flags(req->rq_reqmsg) &
1159                      (MSG_RESENT | MSG_REPLAY)) != (MSG_RESENT | MSG_REPLAY))
1160                         CERROR("invalid flags %x of resent replay\n",
1161                                lustre_msg_get_flags(req->rq_reqmsg));
1162         } else {
1163                 cfs_list_add_tail(&req->rq_replay_list,
1164                                   &exp->exp_req_replay_queue);
1165         }
1166
1167         cfs_spin_unlock(&exp->exp_lock);
1168         return dup;
1169 }
1170
1171 static void target_exp_dequeue_req_replay(struct ptlrpc_request *req)
1172 {
1173         LASSERT(!cfs_list_empty(&req->rq_replay_list));
1174         LASSERT(req->rq_export);
1175
1176         cfs_spin_lock(&req->rq_export->exp_lock);
1177         cfs_list_del_init(&req->rq_replay_list);
1178         cfs_spin_unlock(&req->rq_export->exp_lock);
1179 }
1180
1181 #ifdef __KERNEL__
1182 static void target_finish_recovery(struct obd_device *obd)
1183 {
1184         ENTRY;
1185         LCONSOLE_INFO("%s: sending delayed replies to recovered clients\n",
1186                       obd->obd_name);
1187
1188         ldlm_reprocess_all_ns(obd->obd_namespace);
1189         cfs_spin_lock(&obd->obd_recovery_task_lock);
1190         if (!cfs_list_empty(&obd->obd_req_replay_queue) ||
1191             !cfs_list_empty(&obd->obd_lock_replay_queue) ||
1192             !cfs_list_empty(&obd->obd_final_req_queue)) {
1193                 CERROR("%s: Recovery queues ( %s%s%s) are not empty\n",
1194                        obd->obd_name,
1195                        cfs_list_empty(&obd->obd_req_replay_queue) ? "" : "req ",
1196                        cfs_list_empty(&obd->obd_lock_replay_queue) ? \
1197                                "" : "lock ",
1198                        cfs_list_empty(&obd->obd_final_req_queue) ? \
1199                                "" : "final ");
1200                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
1201                 LBUG();
1202         }
1203         cfs_spin_unlock(&obd->obd_recovery_task_lock);
1204
1205         obd->obd_recovery_end = cfs_time_current_sec();
1206
1207         /* when recovery finished, cleanup orphans on mds and ost */
1208         if (OBT(obd) && OBP(obd, postrecov)) {
1209                 int rc = OBP(obd, postrecov)(obd);
1210                 if (rc < 0)
1211                         LCONSOLE_WARN("%s: Post recovery failed, rc %d\n",
1212                                       obd->obd_name, rc);
1213         }
1214         EXIT;
1215 }
1216
1217 static void abort_req_replay_queue(struct obd_device *obd)
1218 {
1219         struct ptlrpc_request *req, *n;
1220         cfs_list_t abort_list;
1221
1222         CFS_INIT_LIST_HEAD(&abort_list);
1223         cfs_spin_lock(&obd->obd_recovery_task_lock);
1224         cfs_list_splice_init(&obd->obd_req_replay_queue, &abort_list);
1225         cfs_spin_unlock(&obd->obd_recovery_task_lock);
1226         cfs_list_for_each_entry_safe(req, n, &abort_list, rq_list) {
1227                 DEBUG_REQ(D_WARNING, req, "aborted:");
1228                 req->rq_status = -ENOTCONN;
1229                 if (ptlrpc_error(req)) {
1230                         DEBUG_REQ(D_ERROR, req,
1231                                   "failed abort_req_reply; skipping");
1232                 }
1233                 target_exp_dequeue_req_replay(req);
1234                 target_request_copy_put(req);
1235         }
1236 }
1237
1238 static void abort_lock_replay_queue(struct obd_device *obd)
1239 {
1240         struct ptlrpc_request *req, *n;
1241         cfs_list_t abort_list;
1242
1243         CFS_INIT_LIST_HEAD(&abort_list);
1244         cfs_spin_lock(&obd->obd_recovery_task_lock);
1245         cfs_list_splice_init(&obd->obd_lock_replay_queue, &abort_list);
1246         cfs_spin_unlock(&obd->obd_recovery_task_lock);
1247         cfs_list_for_each_entry_safe(req, n, &abort_list, rq_list){
1248                 DEBUG_REQ(D_ERROR, req, "aborted:");
1249                 req->rq_status = -ENOTCONN;
1250                 if (ptlrpc_error(req)) {
1251                         DEBUG_REQ(D_ERROR, req,
1252                                   "failed abort_lock_reply; skipping");
1253                 }
1254                 target_request_copy_put(req);
1255         }
1256 }
1257 #endif
1258
1259 /* Called from a cleanup function if the device is being cleaned up
1260    forcefully.  The exports should all have been disconnected already,
1261    the only thing left to do is
1262      - clear the recovery flags
1263      - cancel the timer
1264      - free queued requests and replies, but don't send replies
1265    Because the obd_stopping flag is set, no new requests should be received.
1266
1267 */
1268 void target_cleanup_recovery(struct obd_device *obd)
1269 {
1270         struct ptlrpc_request *req, *n;
1271         cfs_list_t clean_list;
1272         ENTRY;
1273
1274         CFS_INIT_LIST_HEAD(&clean_list);
1275         cfs_spin_lock(&obd->obd_dev_lock);
1276         if (!obd->obd_recovering) {
1277                 cfs_spin_unlock(&obd->obd_dev_lock);
1278                 EXIT;
1279                 return;
1280         }
1281         obd->obd_recovering = obd->obd_abort_recovery = 0;
1282         cfs_spin_unlock(&obd->obd_dev_lock);
1283
1284         cfs_spin_lock(&obd->obd_recovery_task_lock);
1285         target_cancel_recovery_timer(obd);
1286         cfs_list_splice_init(&obd->obd_req_replay_queue, &clean_list);
1287         cfs_spin_unlock(&obd->obd_recovery_task_lock);
1288
1289         cfs_list_for_each_entry_safe(req, n, &clean_list, rq_list) {
1290                 LASSERT(req->rq_reply_state == 0);
1291                 target_exp_dequeue_req_replay(req);
1292                 target_request_copy_put(req);
1293         }
1294
1295         cfs_spin_lock(&obd->obd_recovery_task_lock);
1296         cfs_list_splice_init(&obd->obd_lock_replay_queue, &clean_list);
1297         cfs_list_splice_init(&obd->obd_final_req_queue, &clean_list);
1298         cfs_spin_unlock(&obd->obd_recovery_task_lock);
1299
1300         cfs_list_for_each_entry_safe(req, n, &clean_list, rq_list){
1301                 LASSERT(req->rq_reply_state == 0);
1302                 target_request_copy_put(req);
1303         }
1304
1305         EXIT;
1306 }
1307
1308 /* obd_recovery_task_lock should be held */
1309 void target_cancel_recovery_timer(struct obd_device *obd)
1310 {
1311         CDEBUG(D_HA, "%s: cancel recovery timer\n", obd->obd_name);
1312         cfs_timer_disarm(&obd->obd_recovery_timer);
1313 }
1314
1315 /* extend = 1 means require at least "duration" seconds left in the timer,
1316    extend = 0 means set the total duration (start_recovery_timer) */
1317 static void reset_recovery_timer(struct obd_device *obd, int duration,
1318                                  int extend)
1319 {
1320         cfs_time_t now = cfs_time_current_sec();
1321         cfs_duration_t left;
1322
1323         cfs_spin_lock(&obd->obd_recovery_task_lock);
1324         if (!obd->obd_recovering || obd->obd_abort_recovery) {
1325                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
1326                 return;
1327         }
1328
1329         left = cfs_time_sub(obd->obd_recovery_end, now);
1330
1331         if (extend && (duration > left))
1332                 obd->obd_recovery_timeout += duration - left;
1333         else if (!extend && (duration > obd->obd_recovery_timeout))
1334                 /* Track the client's largest expected replay time */
1335                 obd->obd_recovery_timeout = duration;
1336
1337         /* Hard limit of obd_recovery_time_hard which should not happen */
1338         if (obd->obd_recovery_timeout > obd->obd_recovery_time_hard)
1339                 obd->obd_recovery_timeout = obd->obd_recovery_time_hard;
1340
1341         obd->obd_recovery_end = obd->obd_recovery_start +
1342                                 obd->obd_recovery_timeout;
1343         if (!cfs_timer_is_armed(&obd->obd_recovery_timer) ||
1344             cfs_time_before(now, obd->obd_recovery_end)) {
1345                 left = cfs_time_sub(obd->obd_recovery_end, now);
1346                 cfs_timer_arm(&obd->obd_recovery_timer, cfs_time_shift(left));
1347         }
1348         cfs_spin_unlock(&obd->obd_recovery_task_lock);
1349         CDEBUG(D_HA, "%s: recovery timer will expire in %u seconds\n",
1350                obd->obd_name, (unsigned)left);
1351 }
1352
1353 static void check_and_start_recovery_timer(struct obd_device *obd)
1354 {
1355         cfs_spin_lock(&obd->obd_recovery_task_lock);
1356         if (cfs_timer_is_armed(&obd->obd_recovery_timer)) {
1357                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
1358                 return;
1359         }
1360         CDEBUG(D_HA, "%s: starting recovery timer\n", obd->obd_name);
1361         obd->obd_recovery_start = cfs_time_current_sec();
1362         cfs_spin_unlock(&obd->obd_recovery_task_lock);
1363
1364         reset_recovery_timer(obd, obd->obd_recovery_timeout, 0);
1365 }
1366
1367 /* Reset the timer with each new client connection */
1368 /*
1369  * This timer is actually reconnect_timer, which is for making sure
1370  * the total recovery window is at least as big as my reconnect
1371  * attempt timing. So the initial recovery time_out will be set to
1372  * OBD_RECOVERY_FACTOR * obd_timeout. If the timeout coming
1373  * from client is bigger than this, then the recovery time_out will
1374  * be extended to make sure the client could be reconnected, in the
1375  * process, the timeout from the new client should be ignored.
1376  */
1377
1378 static void
1379 target_start_and_reset_recovery_timer(struct obd_device *obd,
1380                                       struct ptlrpc_request *req,
1381                                       int new_client)
1382 {
1383         int service_time = lustre_msg_get_service_time(req->rq_reqmsg);
1384
1385         if (!new_client && service_time)
1386                 /* Teach server about old server's estimates, as first guess
1387                  * at how long new requests will take. */
1388                 at_measured(&req->rq_rqbd->rqbd_service->srv_at_estimate,
1389                             service_time);
1390
1391         check_and_start_recovery_timer(obd);
1392
1393         /* convert the service time to rpc timeout,
1394          * reuse service_time to limit stack usage */
1395         service_time = at_est2timeout(service_time);
1396
1397         /* We expect other clients to timeout within service_time, then try
1398          * to reconnect, then try the failover server.  The max delay between
1399          * connect attempts is SWITCH_MAX + SWITCH_INC + INITIAL */
1400         service_time += 2 * (CONNECTION_SWITCH_MAX + CONNECTION_SWITCH_INC +
1401                              INITIAL_CONNECT_TIMEOUT);
1402         if (service_time > obd->obd_recovery_timeout && !new_client)
1403                 reset_recovery_timer(obd, service_time, 0);
1404 }
1405
1406 #ifdef __KERNEL__
1407
1408 /** Health checking routines */
1409 static inline int exp_connect_healthy(struct obd_export *exp)
1410 {
1411         return (exp->exp_in_recovery);
1412 }
1413
1414 /** if export done req_replay or has replay in queue */
1415 static inline int exp_req_replay_healthy(struct obd_export *exp)
1416 {
1417         return (!exp->exp_req_replay_needed ||
1418                 cfs_atomic_read(&exp->exp_replay_count) > 0);
1419 }
1420 /** if export done lock_replay or has replay in queue */
1421 static inline int exp_lock_replay_healthy(struct obd_export *exp)
1422 {
1423         return (!exp->exp_lock_replay_needed ||
1424                 cfs_atomic_read(&exp->exp_replay_count) > 0);
1425 }
1426
1427 static inline int exp_vbr_healthy(struct obd_export *exp)
1428 {
1429         return (!exp->exp_vbr_failed);
1430 }
1431
1432 static inline int exp_finished(struct obd_export *exp)
1433 {
1434         return (exp->exp_in_recovery && !exp->exp_lock_replay_needed);
1435 }
1436
1437 /** Checking routines for recovery */
1438 static int check_for_clients(struct obd_device *obd)
1439 {
1440         if (obd->obd_abort_recovery || obd->obd_recovery_expired)
1441                 return 1;
1442         LASSERT(obd->obd_connected_clients <= obd->obd_max_recoverable_clients);
1443         if (obd->obd_no_conn == 0 &&
1444             obd->obd_connected_clients + obd->obd_stale_clients ==
1445             obd->obd_max_recoverable_clients)
1446                 return 1;
1447         return 0;
1448 }
1449
1450 static int check_for_next_transno(struct obd_device *obd)
1451 {
1452         struct ptlrpc_request *req = NULL;
1453         int wake_up = 0, connected, completed, queue_len;
1454         __u64 next_transno, req_transno;
1455         ENTRY;
1456
1457         cfs_spin_lock(&obd->obd_recovery_task_lock);
1458         if (!cfs_list_empty(&obd->obd_req_replay_queue)) {
1459                 req = cfs_list_entry(obd->obd_req_replay_queue.next,
1460                                      struct ptlrpc_request, rq_list);
1461                 req_transno = lustre_msg_get_transno(req->rq_reqmsg);
1462         } else {
1463                 req_transno = 0;
1464         }
1465
1466         connected = obd->obd_connected_clients;
1467         completed = connected - cfs_atomic_read(&obd->obd_req_replay_clients);
1468         queue_len = obd->obd_requests_queued_for_recovery;
1469         next_transno = obd->obd_next_recovery_transno;
1470
1471         CDEBUG(D_HA, "max: %d, connected: %d, completed: %d, queue_len: %d, "
1472                "req_transno: "LPU64", next_transno: "LPU64"\n",
1473                obd->obd_max_recoverable_clients, connected, completed,
1474                queue_len, req_transno, next_transno);
1475
1476         if (obd->obd_abort_recovery) {
1477                 CDEBUG(D_HA, "waking for aborted recovery\n");
1478                 wake_up = 1;
1479         } else if (obd->obd_recovery_expired) {
1480                 CDEBUG(D_HA, "waking for expired recovery\n");
1481                 wake_up = 1;
1482         } else if (cfs_atomic_read(&obd->obd_req_replay_clients) == 0) {
1483                 CDEBUG(D_HA, "waking for completed recovery\n");
1484                 wake_up = 1;
1485         } else if (req_transno == next_transno) {
1486                 CDEBUG(D_HA, "waking for next ("LPD64")\n", next_transno);
1487                 wake_up = 1;
1488         } else if (queue_len == cfs_atomic_read(&obd->obd_req_replay_clients)) {
1489                 int d_lvl = D_HA;
1490                 /** handle gaps occured due to lost reply or VBR */
1491                 LASSERTF(req_transno >= next_transno,
1492                          "req_transno: "LPU64", next_transno: "LPU64"\n",
1493                          req_transno, next_transno);
1494                 if (req_transno > obd->obd_last_committed &&
1495                     !obd->obd_version_recov)
1496                         d_lvl = D_ERROR;
1497                 CDEBUG(d_lvl,
1498                        "%s: waking for gap in transno, VBR is %s (skip: "
1499                        LPD64", ql: %d, comp: %d, conn: %d, next: "LPD64
1500                        ", last_committed: "LPD64")\n",
1501                        obd->obd_name, obd->obd_version_recov ? "ON" : "OFF",
1502                        next_transno, queue_len, completed, connected,
1503                        req_transno, obd->obd_last_committed);
1504                 obd->obd_next_recovery_transno = req_transno;
1505                 wake_up = 1;
1506         } else if (OBD_FAIL_CHECK(OBD_FAIL_MDS_RECOVERY_ACCEPTS_GAPS)) {
1507                 CDEBUG(D_HA, "accepting transno gaps is explicitly allowed"
1508                        " by fail_lock, waking up ("LPD64")\n", next_transno);
1509                 obd->obd_next_recovery_transno = req_transno;
1510                 wake_up = 1;
1511         }
1512         cfs_spin_unlock(&obd->obd_recovery_task_lock);
1513         return wake_up;
1514 }
1515
1516 static int check_for_next_lock(struct obd_device *obd)
1517 {
1518         int wake_up = 0;
1519
1520         cfs_spin_lock(&obd->obd_recovery_task_lock);
1521         if (!cfs_list_empty(&obd->obd_lock_replay_queue)) {
1522                 CDEBUG(D_HA, "waking for next lock\n");
1523                 wake_up = 1;
1524         } else if (cfs_atomic_read(&obd->obd_lock_replay_clients) == 0) {
1525                 CDEBUG(D_HA, "waking for completed lock replay\n");
1526                 wake_up = 1;
1527         } else if (obd->obd_abort_recovery) {
1528                 CDEBUG(D_HA, "waking for aborted recovery\n");
1529                 wake_up = 1;
1530         } else if (obd->obd_recovery_expired) {
1531                 CDEBUG(D_HA, "waking for expired recovery\n");
1532                 wake_up = 1;
1533         }
1534         cfs_spin_unlock(&obd->obd_recovery_task_lock);
1535
1536         return wake_up;
1537 }
1538
1539 /**
1540  * wait for recovery events,
1541  * check its status with help of check_routine
1542  * evict dead clients via health_check
1543  */
1544 static int target_recovery_overseer(struct obd_device *obd,
1545                                     int (*check_routine)(struct obd_device *),
1546                                     int (*health_check)(struct obd_export *))
1547 {
1548 repeat:
1549         cfs_wait_event(obd->obd_next_transno_waitq, check_routine(obd));
1550         if (obd->obd_abort_recovery) {
1551                 CWARN("recovery is aborted, evict exports in recovery\n");
1552                 /** evict exports which didn't finish recovery yet */
1553                 class_disconnect_stale_exports(obd, exp_finished);
1554                 return 1;
1555         } else if (obd->obd_recovery_expired) {
1556                 obd->obd_recovery_expired = 0;
1557                 /** If some clients died being recovered, evict them */
1558                 CDEBUG(D_WARNING,
1559                        "recovery is timed out, evict stale exports\n");
1560                 /** evict cexports with no replay in queue, they are stalled */
1561                 class_disconnect_stale_exports(obd, health_check);
1562                 /** continue with VBR */
1563                 cfs_spin_lock(&obd->obd_dev_lock);
1564                 obd->obd_version_recov = 1;
1565                 cfs_spin_unlock(&obd->obd_dev_lock);
1566                 /**
1567                  * reset timer, recovery will proceed with versions now,
1568                  * timeout is set just to handle reconnection delays
1569                  */
1570                 reset_recovery_timer(obd, RECONNECT_DELAY_MAX, 1);
1571                 /** Wait for recovery events again, after evicting bad clients */
1572                 goto repeat;
1573         }
1574         return 0;
1575 }
1576
1577 static struct ptlrpc_request *target_next_replay_req(struct obd_device *obd)
1578 {
1579         struct ptlrpc_request *req = NULL;
1580         ENTRY;
1581
1582         CDEBUG(D_HA, "Waiting for transno "LPD64"\n",
1583                obd->obd_next_recovery_transno);
1584
1585         if (target_recovery_overseer(obd, check_for_next_transno,
1586                                      exp_req_replay_healthy)) {
1587                 abort_req_replay_queue(obd);
1588                 abort_lock_replay_queue(obd);
1589         }
1590
1591         cfs_spin_lock(&obd->obd_recovery_task_lock);
1592         if (!cfs_list_empty(&obd->obd_req_replay_queue)) {
1593                 req = cfs_list_entry(obd->obd_req_replay_queue.next,
1594                                      struct ptlrpc_request, rq_list);
1595                 cfs_list_del_init(&req->rq_list);
1596                 obd->obd_requests_queued_for_recovery--;
1597                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
1598         } else {
1599                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
1600                 LASSERT(cfs_list_empty(&obd->obd_req_replay_queue));
1601                 LASSERT(cfs_atomic_read(&obd->obd_req_replay_clients) == 0);
1602                 /** evict exports failed VBR */
1603                 class_disconnect_stale_exports(obd, exp_vbr_healthy);
1604         }
1605         RETURN(req);
1606 }
1607
1608 static struct ptlrpc_request *target_next_replay_lock(struct obd_device *obd)
1609 {
1610         struct ptlrpc_request *req = NULL;
1611
1612         CDEBUG(D_HA, "Waiting for lock\n");
1613         if (target_recovery_overseer(obd, check_for_next_lock,
1614                                      exp_lock_replay_healthy))
1615                 abort_lock_replay_queue(obd);
1616
1617         cfs_spin_lock(&obd->obd_recovery_task_lock);
1618         if (!cfs_list_empty(&obd->obd_lock_replay_queue)) {
1619                 req = cfs_list_entry(obd->obd_lock_replay_queue.next,
1620                                      struct ptlrpc_request, rq_list);
1621                 cfs_list_del_init(&req->rq_list);
1622                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
1623         } else {
1624                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
1625                 LASSERT(cfs_list_empty(&obd->obd_lock_replay_queue));
1626                 LASSERT(cfs_atomic_read(&obd->obd_lock_replay_clients) == 0);
1627                 /** evict exports failed VBR */
1628                 class_disconnect_stale_exports(obd, exp_vbr_healthy);
1629         }
1630         return req;
1631 }
1632
1633 static struct ptlrpc_request *target_next_final_ping(struct obd_device *obd)
1634 {
1635         struct ptlrpc_request *req = NULL;
1636
1637         cfs_spin_lock(&obd->obd_recovery_task_lock);
1638         if (!cfs_list_empty(&obd->obd_final_req_queue)) {
1639                 req = cfs_list_entry(obd->obd_final_req_queue.next,
1640                                      struct ptlrpc_request, rq_list);
1641                 cfs_list_del_init(&req->rq_list);
1642                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
1643                 if (req->rq_export->exp_in_recovery) {
1644                         cfs_spin_lock(&req->rq_export->exp_lock);
1645                         req->rq_export->exp_in_recovery = 0;
1646                         cfs_spin_unlock(&req->rq_export->exp_lock);
1647                 }
1648         } else {
1649                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
1650         }
1651         return req;
1652 }
1653
1654 static int handle_recovery_req(struct ptlrpc_thread *thread,
1655                                struct ptlrpc_request *req,
1656                                svc_handler_t handler)
1657 {
1658         int rc;
1659         ENTRY;
1660
1661         /**
1662          * export can be evicted during recovery, no need to handle replays for
1663          * it after that, discard such request silently
1664          */
1665         if (req->rq_export->exp_disconnected)
1666                 GOTO(reqcopy_put, rc = 0);
1667
1668         rc = lu_context_init(&req->rq_recov_session, LCT_SESSION);
1669         if (rc) {
1670                 CERROR("Failure to initialize session: %d\n", rc);
1671                 GOTO(reqcopy_put, rc);
1672         }
1673
1674         req->rq_recov_session.lc_thread = thread;
1675         lu_context_enter(&req->rq_recov_session);
1676         req->rq_svc_thread = thread;
1677         req->rq_svc_thread->t_env->le_ses = &req->rq_recov_session;
1678
1679         /* thread context */
1680         lu_context_enter(&thread->t_env->le_ctx);
1681         (void)handler(req);
1682         lu_context_exit(&thread->t_env->le_ctx);
1683
1684         lu_context_exit(&req->rq_recov_session);
1685         lu_context_fini(&req->rq_recov_session);
1686         /* don't reset timer for final stage */
1687         if (!exp_finished(req->rq_export)) {
1688                 /**
1689                  * Add request timeout to the recovery time so next request from
1690                  * this client may come in recovery time
1691                  */
1692                  reset_recovery_timer(class_exp2obd(req->rq_export),
1693                                       AT_OFF ? obd_timeout :
1694                                       lustre_msg_get_timeout(req->rq_reqmsg), 1);
1695         }
1696 reqcopy_put:
1697         RETURN(rc);
1698 }
1699
1700 static int target_recovery_thread(void *arg)
1701 {
1702         struct lu_target *lut = arg;
1703         struct obd_device *obd = lut->lut_obd;
1704         struct ptlrpc_request *req;
1705         struct target_recovery_data *trd = &obd->obd_recovery_data;
1706         unsigned long delta;
1707         unsigned long flags;
1708         struct lu_env env;
1709         struct ptlrpc_thread fake_svc_thread, *thread = &fake_svc_thread;
1710         int rc = 0;
1711         ENTRY;
1712
1713         cfs_daemonize_ctxt("tgt_recov");
1714
1715         SIGNAL_MASK_LOCK(current, flags);
1716         sigfillset(&current->blocked);
1717         RECALC_SIGPENDING;
1718         SIGNAL_MASK_UNLOCK(current, flags);
1719
1720         rc = lu_context_init(&env.le_ctx, LCT_MD_THREAD);
1721         if (rc)
1722                 RETURN(rc);
1723
1724         thread->t_env = &env;
1725         thread->t_id = -1; /* force filter_iobuf_get/put to use local buffers */
1726         env.le_ctx.lc_thread = thread;
1727         thread->t_data = NULL;
1728
1729         CERROR("%s: started recovery thread pid %d\n", obd->obd_name,
1730                cfs_curproc_pid());
1731         trd->trd_processing_task = cfs_curproc_pid();
1732
1733         cfs_spin_lock(&obd->obd_dev_lock);
1734         obd->obd_recovering = 1;
1735         cfs_spin_unlock(&obd->obd_dev_lock);
1736         cfs_complete(&trd->trd_starting);
1737
1738         /* first of all, we have to know the first transno to replay */
1739         if (target_recovery_overseer(obd, check_for_clients,
1740                                      exp_connect_healthy)) {
1741                 abort_req_replay_queue(obd);
1742                 abort_lock_replay_queue(obd);
1743         }
1744
1745         /* next stage: replay requests */
1746         delta = jiffies;
1747         CDEBUG(D_INFO, "1: request replay stage - %d clients from t"LPU64"\n",
1748                cfs_atomic_read(&obd->obd_req_replay_clients),
1749                obd->obd_next_recovery_transno);
1750         while ((req = target_next_replay_req(obd))) {
1751                 LASSERT(trd->trd_processing_task == cfs_curproc_pid());
1752                 DEBUG_REQ(D_HA, req, "processing t"LPD64" from %s",
1753                           lustre_msg_get_transno(req->rq_reqmsg),
1754                           libcfs_nid2str(req->rq_peer.nid));
1755                 handle_recovery_req(thread, req,
1756                                     trd->trd_recovery_handler);
1757                 /**
1758                  * bz18031: increase next_recovery_transno before
1759                  * target_request_copy_put() will drop exp_rpc reference
1760                  */
1761                 cfs_spin_lock(&obd->obd_recovery_task_lock);
1762                 obd->obd_next_recovery_transno++;
1763                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
1764                 target_exp_dequeue_req_replay(req);
1765                 target_request_copy_put(req);
1766                 obd->obd_replayed_requests++;
1767         }
1768
1769         /**
1770          * The second stage: replay locks
1771          */
1772         CDEBUG(D_INFO, "2: lock replay stage - %d clients\n",
1773                cfs_atomic_read(&obd->obd_lock_replay_clients));
1774         while ((req = target_next_replay_lock(obd))) {
1775                 LASSERT(trd->trd_processing_task == cfs_curproc_pid());
1776                 DEBUG_REQ(D_HA, req, "processing lock from %s: ",
1777                           libcfs_nid2str(req->rq_peer.nid));
1778                 handle_recovery_req(thread, req,
1779                                     trd->trd_recovery_handler);
1780                 target_request_copy_put(req);
1781                 obd->obd_replayed_locks++;
1782         }
1783
1784         /**
1785          * The third stage: reply on final pings, at this moment all clients
1786          * must have request in final queue
1787          */
1788         CDEBUG(D_INFO, "3: final stage - process recovery completion pings\n");
1789         /** Update server last boot epoch */
1790         lut_boot_epoch_update(lut);
1791         /* We drop recoverying flag to forward all new requests
1792          * to regular mds_handle() since now */
1793         cfs_spin_lock(&obd->obd_dev_lock);
1794         obd->obd_recovering = obd->obd_abort_recovery = 0;
1795         cfs_spin_unlock(&obd->obd_dev_lock);
1796         cfs_spin_lock(&obd->obd_recovery_task_lock);
1797         target_cancel_recovery_timer(obd);
1798         cfs_spin_unlock(&obd->obd_recovery_task_lock);
1799         while ((req = target_next_final_ping(obd))) {
1800                 LASSERT(trd->trd_processing_task == cfs_curproc_pid());
1801                 DEBUG_REQ(D_HA, req, "processing final ping from %s: ",
1802                           libcfs_nid2str(req->rq_peer.nid));
1803                 handle_recovery_req(thread, req,
1804                                     trd->trd_recovery_handler);
1805                 target_request_copy_put(req);
1806         }
1807
1808         delta = (jiffies - delta) / CFS_HZ;
1809         CDEBUG(D_INFO,"4: recovery completed in %lus - %d/%d reqs/locks\n",
1810               delta, obd->obd_replayed_requests, obd->obd_replayed_locks);
1811         if (delta > OBD_RECOVERY_TIME_SOFT) {
1812                 CWARN("too long recovery - read logs\n");
1813                 libcfs_debug_dumplog();
1814         }
1815
1816         target_finish_recovery(obd);
1817
1818         lu_context_fini(&env.le_ctx);
1819         trd->trd_processing_task = 0;
1820         cfs_complete(&trd->trd_finishing);
1821         RETURN(rc);
1822 }
1823
1824 static int target_start_recovery_thread(struct lu_target *lut,
1825                                         svc_handler_t handler)
1826 {
1827         struct obd_device *obd = lut->lut_obd;
1828         int rc = 0;
1829         struct target_recovery_data *trd = &obd->obd_recovery_data;
1830
1831         memset(trd, 0, sizeof(*trd));
1832         cfs_init_completion(&trd->trd_starting);
1833         cfs_init_completion(&trd->trd_finishing);
1834         trd->trd_recovery_handler = handler;
1835
1836         if (cfs_kernel_thread(target_recovery_thread, lut, 0) > 0) {
1837                 cfs_wait_for_completion(&trd->trd_starting);
1838                 LASSERT(obd->obd_recovering != 0);
1839         } else
1840                 rc = -ECHILD;
1841
1842         return rc;
1843 }
1844
1845 void target_stop_recovery_thread(struct obd_device *obd)
1846 {
1847         if (obd->obd_recovery_data.trd_processing_task > 0) {
1848                 struct target_recovery_data *trd = &obd->obd_recovery_data;
1849                 /** recovery can be done but postrecovery is not yet */
1850                 cfs_spin_lock(&obd->obd_dev_lock);
1851                 if (obd->obd_recovering) {
1852                         CERROR("%s: Aborting recovery\n", obd->obd_name);
1853                         obd->obd_abort_recovery = 1;
1854                         cfs_waitq_signal(&obd->obd_next_transno_waitq);
1855                 }
1856                 cfs_spin_unlock(&obd->obd_dev_lock);
1857                 cfs_wait_for_completion(&trd->trd_finishing);
1858         }
1859 }
1860
1861 void target_recovery_fini(struct obd_device *obd)
1862 {
1863         class_disconnect_exports(obd);
1864         target_stop_recovery_thread(obd);
1865         target_cleanup_recovery(obd);
1866 }
1867 EXPORT_SYMBOL(target_recovery_fini);
1868
1869 static void target_recovery_expired(unsigned long castmeharder)
1870 {
1871         struct obd_device *obd = (struct obd_device *)castmeharder;
1872         CDEBUG(D_HA, "%s: recovery timed out; %d clients are still in recovery"
1873                " after %lds (%d clients connected)\n",
1874                obd->obd_name, cfs_atomic_read(&obd->obd_lock_replay_clients),
1875                cfs_time_current_sec()- obd->obd_recovery_start,
1876                obd->obd_connected_clients);
1877
1878         obd->obd_recovery_expired = 1;
1879         cfs_waitq_signal(&obd->obd_next_transno_waitq);
1880 }
1881
1882 void target_recovery_init(struct lu_target *lut, svc_handler_t handler)
1883 {
1884         struct obd_device *obd = lut->lut_obd;
1885         if (obd->obd_max_recoverable_clients == 0) {
1886                 /** Update server last boot epoch */
1887                 lut_boot_epoch_update(lut);
1888                 return;
1889         }
1890
1891         CWARN("RECOVERY: service %s, %d recoverable clients, "
1892               "last_transno "LPU64"\n", obd->obd_name,
1893               obd->obd_max_recoverable_clients, obd->obd_last_committed);
1894         LASSERT(obd->obd_stopping == 0);
1895         obd->obd_next_recovery_transno = obd->obd_last_committed + 1;
1896         obd->obd_recovery_start = 0;
1897         obd->obd_recovery_end = 0;
1898
1899         /* both values can be get from mount data already */
1900         if (obd->obd_recovery_timeout == 0)
1901                 obd->obd_recovery_timeout = OBD_RECOVERY_TIME_SOFT;
1902         if (obd->obd_recovery_time_hard == 0)
1903                 obd->obd_recovery_time_hard = OBD_RECOVERY_TIME_HARD;
1904         cfs_timer_init(&obd->obd_recovery_timer, target_recovery_expired, obd);
1905         target_start_recovery_thread(lut, handler);
1906 }
1907 EXPORT_SYMBOL(target_recovery_init);
1908
1909 #endif
1910
1911 static int target_process_req_flags(struct obd_device *obd,
1912                                     struct ptlrpc_request *req)
1913 {
1914         struct obd_export *exp = req->rq_export;
1915         LASSERT(exp != NULL);
1916         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
1917                 /* client declares he's ready to replay locks */
1918                 if (exp->exp_req_replay_needed) {
1919                         LASSERT(cfs_atomic_read(&obd->obd_req_replay_clients) >
1920                                 0);
1921                         cfs_spin_lock(&exp->exp_lock);
1922                         exp->exp_req_replay_needed = 0;
1923                         cfs_spin_unlock(&exp->exp_lock);
1924                         cfs_atomic_dec(&obd->obd_req_replay_clients);
1925                 }
1926         }
1927         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
1928                 /* client declares he's ready to complete recovery
1929                  * so, we put the request on th final queue */
1930                 if (exp->exp_lock_replay_needed) {
1931                         LASSERT(cfs_atomic_read(&obd->obd_lock_replay_clients) >
1932                                 0);
1933                         cfs_spin_lock(&exp->exp_lock);
1934                         exp->exp_lock_replay_needed = 0;
1935                         cfs_spin_unlock(&exp->exp_lock);
1936                         cfs_atomic_dec(&obd->obd_lock_replay_clients);
1937                 }
1938         }
1939         return 0;
1940 }
1941
1942 int target_queue_recovery_request(struct ptlrpc_request *req,
1943                                   struct obd_device *obd)
1944 {
1945         cfs_list_t *tmp;
1946         int inserted = 0;
1947         __u64 transno = lustre_msg_get_transno(req->rq_reqmsg);
1948         ENTRY;
1949
1950         if (obd->obd_recovery_data.trd_processing_task == cfs_curproc_pid()) {
1951                 /* Processing the queue right now, don't re-add. */
1952                 RETURN(1);
1953         }
1954
1955         target_process_req_flags(obd, req);
1956
1957         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
1958                 /* client declares he's ready to complete recovery
1959                  * so, we put the request on th final queue */
1960                 target_request_copy_get(req);
1961                 DEBUG_REQ(D_HA, req, "queue final req");
1962                 cfs_waitq_signal(&obd->obd_next_transno_waitq);
1963                 cfs_spin_lock(&obd->obd_recovery_task_lock);
1964                 if (obd->obd_recovering) {
1965                         cfs_list_add_tail(&req->rq_list,
1966                                           &obd->obd_final_req_queue);
1967                 } else {
1968                         cfs_spin_unlock(&obd->obd_recovery_task_lock);
1969                         target_request_copy_put(req);
1970                         RETURN(obd->obd_stopping ? -ENOTCONN : 1);
1971                 }
1972                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
1973                 RETURN(0);
1974         }
1975         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
1976                 /* client declares he's ready to replay locks */
1977                 target_request_copy_get(req);
1978                 DEBUG_REQ(D_HA, req, "queue lock replay req");
1979                 cfs_waitq_signal(&obd->obd_next_transno_waitq);
1980                 cfs_spin_lock(&obd->obd_recovery_task_lock);
1981                 LASSERT(obd->obd_recovering);
1982                 /* usually due to recovery abort */
1983                 if (!req->rq_export->exp_in_recovery) {
1984                         cfs_spin_unlock(&obd->obd_recovery_task_lock);
1985                         target_request_copy_put(req);
1986                         RETURN(-ENOTCONN);
1987                 }
1988                 LASSERT(req->rq_export->exp_lock_replay_needed);
1989                 cfs_list_add_tail(&req->rq_list, &obd->obd_lock_replay_queue);
1990                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
1991                 RETURN(0);
1992         }
1993
1994         /* CAVEAT EMPTOR: The incoming request message has been swabbed
1995          * (i.e. buflens etc are in my own byte order), but type-dependent
1996          * buffers (eg mds_body, ost_body etc) have NOT been swabbed. */
1997
1998         if (!transno) {
1999                 CFS_INIT_LIST_HEAD(&req->rq_list);
2000                 DEBUG_REQ(D_HA, req, "not queueing");
2001                 RETURN(1);
2002         }
2003
2004         /* If we're processing the queue, we want don't want to queue this
2005          * message.
2006          *
2007          * Also, if this request has a transno less than the one we're waiting
2008          * for, we should process it now.  It could (and currently always will)
2009          * be an open request for a descriptor that was opened some time ago.
2010          *
2011          * Also, a resent, replayed request that has already been
2012          * handled will pass through here and be processed immediately.
2013          */
2014         CWARN("Next recovery transno: "LPU64", current: "LPU64", replaying\n",
2015               obd->obd_next_recovery_transno, transno);
2016         cfs_spin_lock(&obd->obd_recovery_task_lock);
2017         if (transno < obd->obd_next_recovery_transno) {
2018                 /* Processing the queue right now, don't re-add. */
2019                 LASSERT(cfs_list_empty(&req->rq_list));
2020                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
2021                 RETURN(1);
2022         }
2023         cfs_spin_unlock(&obd->obd_recovery_task_lock);
2024
2025         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_REPLAY_DROP))
2026                 RETURN(0);
2027
2028         target_request_copy_get(req);
2029         if (!req->rq_export->exp_in_recovery) {
2030                 target_request_copy_put(req);
2031                 RETURN(-ENOTCONN);
2032         }
2033         LASSERT(req->rq_export->exp_req_replay_needed);
2034
2035         if (target_exp_enqueue_req_replay(req)) {
2036                 DEBUG_REQ(D_ERROR, req, "dropping resent queued req");
2037                 target_request_copy_put(req);
2038                 RETURN(0);
2039         }
2040
2041         /* XXX O(n^2) */
2042         cfs_spin_lock(&obd->obd_recovery_task_lock);
2043         LASSERT(obd->obd_recovering);
2044         cfs_list_for_each(tmp, &obd->obd_req_replay_queue) {
2045                 struct ptlrpc_request *reqiter =
2046                         cfs_list_entry(tmp, struct ptlrpc_request, rq_list);
2047
2048                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) > transno) {
2049                         cfs_list_add_tail(&req->rq_list, &reqiter->rq_list);
2050                         inserted = 1;
2051                         break;
2052                 }
2053
2054                 if (unlikely(lustre_msg_get_transno(reqiter->rq_reqmsg) ==
2055                              transno)) {
2056                         DEBUG_REQ(D_ERROR, req, "dropping replay: transno "
2057                                   "has been claimed by another client");
2058                         cfs_spin_unlock(&obd->obd_recovery_task_lock);
2059                         target_exp_dequeue_req_replay(req);
2060                         target_request_copy_put(req);
2061                         RETURN(0);
2062                 }
2063         }
2064
2065         if (!inserted)
2066                 cfs_list_add_tail(&req->rq_list, &obd->obd_req_replay_queue);
2067
2068         obd->obd_requests_queued_for_recovery++;
2069         cfs_spin_unlock(&obd->obd_recovery_task_lock);
2070         cfs_waitq_signal(&obd->obd_next_transno_waitq);
2071         RETURN(0);
2072 }
2073
2074 /**
2075  * Packs current SLV and Limit into \a req.
2076  */
2077 int target_pack_pool_reply(struct ptlrpc_request *req)
2078 {
2079         struct obd_device *obd;
2080         ENTRY;
2081
2082         /*
2083          * Check that we still have all structures alive as this may
2084          * be some late rpc in shutdown time.
2085          */
2086         if (unlikely(!req->rq_export || !req->rq_export->exp_obd ||
2087                      !exp_connect_lru_resize(req->rq_export))) {
2088                 lustre_msg_set_slv(req->rq_repmsg, 0);
2089                 lustre_msg_set_limit(req->rq_repmsg, 0);
2090                 RETURN(0);
2091         }
2092
2093         /*
2094          * OBD is alive here as export is alive, which we checked above.
2095          */
2096         obd = req->rq_export->exp_obd;
2097
2098         cfs_read_lock(&obd->obd_pool_lock);
2099         lustre_msg_set_slv(req->rq_repmsg, obd->obd_pool_slv);
2100         lustre_msg_set_limit(req->rq_repmsg, obd->obd_pool_limit);
2101         cfs_read_unlock(&obd->obd_pool_lock);
2102
2103         RETURN(0);
2104 }
2105
2106 int target_send_reply_msg(struct ptlrpc_request *req, int rc, int fail_id)
2107 {
2108         if (OBD_FAIL_CHECK_ORSET(fail_id & ~OBD_FAIL_ONCE, OBD_FAIL_ONCE)) {
2109                 DEBUG_REQ(D_ERROR, req, "dropping reply");
2110                 return (-ECOMM);
2111         }
2112
2113         if (unlikely(rc)) {
2114                 DEBUG_REQ(D_ERROR, req, "processing error (%d)", rc);
2115                 req->rq_status = rc;
2116                 return (ptlrpc_send_error(req, 1));
2117         } else {
2118                 DEBUG_REQ(D_NET, req, "sending reply");
2119         }
2120
2121         return (ptlrpc_send_reply(req, PTLRPC_REPLY_MAYBE_DIFFICULT));
2122 }
2123
2124 void target_send_reply(struct ptlrpc_request *req, int rc, int fail_id)
2125 {
2126         int                        netrc;
2127         struct ptlrpc_reply_state *rs;
2128         struct obd_device         *obd;
2129         struct obd_export         *exp;
2130         struct ptlrpc_service     *svc;
2131         ENTRY;
2132
2133         if (req->rq_no_reply) {
2134                 EXIT;
2135                 return;
2136         }
2137
2138         svc = req->rq_rqbd->rqbd_service;
2139         rs = req->rq_reply_state;
2140         if (rs == NULL || !rs->rs_difficult) {
2141                 /* no notifiers */
2142                 target_send_reply_msg (req, rc, fail_id);
2143                 EXIT;
2144                 return;
2145         }
2146
2147         /* must be an export if locks saved */
2148         LASSERT (req->rq_export != NULL);
2149         /* req/reply consistent */
2150         LASSERT (rs->rs_service == svc);
2151
2152         /* "fresh" reply */
2153         LASSERT (!rs->rs_scheduled);
2154         LASSERT (!rs->rs_scheduled_ever);
2155         LASSERT (!rs->rs_handled);
2156         LASSERT (!rs->rs_on_net);
2157         LASSERT (rs->rs_export == NULL);
2158         LASSERT (cfs_list_empty(&rs->rs_obd_list));
2159         LASSERT (cfs_list_empty(&rs->rs_exp_list));
2160
2161         exp = class_export_get (req->rq_export);
2162         obd = exp->exp_obd;
2163
2164         /* disable reply scheduling while I'm setting up */
2165         rs->rs_scheduled = 1;
2166         rs->rs_on_net    = 1;
2167         rs->rs_xid       = req->rq_xid;
2168         rs->rs_transno   = req->rq_transno;
2169         rs->rs_export    = exp;
2170         rs->rs_opc       = lustre_msg_get_opc(rs->rs_msg);
2171
2172         cfs_spin_lock(&exp->exp_uncommitted_replies_lock);
2173         CDEBUG(D_NET, "rs transno = "LPU64", last committed = "LPU64"\n",
2174                rs->rs_transno, exp->exp_last_committed);
2175         if (rs->rs_transno > exp->exp_last_committed) {
2176                 /* not committed already */
2177                 cfs_list_add_tail(&rs->rs_obd_list,
2178                                   &exp->exp_uncommitted_replies);
2179         }
2180         cfs_spin_unlock (&exp->exp_uncommitted_replies_lock);
2181
2182         cfs_spin_lock(&exp->exp_lock);
2183         cfs_list_add_tail(&rs->rs_exp_list, &exp->exp_outstanding_replies);
2184         cfs_spin_unlock(&exp->exp_lock);
2185
2186         netrc = target_send_reply_msg (req, rc, fail_id);
2187
2188         cfs_spin_lock(&svc->srv_lock);
2189
2190         cfs_atomic_inc(&svc->srv_n_difficult_replies);
2191
2192         if (netrc != 0) {
2193                 /* error sending: reply is off the net.  Also we need +1
2194                  * reply ref until ptlrpc_handle_rs() is done
2195                  * with the reply state (if the send was successful, there
2196                  * would have been +1 ref for the net, which
2197                  * reply_out_callback leaves alone) */
2198                 rs->rs_on_net = 0;
2199                 ptlrpc_rs_addref(rs);
2200                 cfs_atomic_inc (&svc->srv_outstanding_replies);
2201         }
2202
2203         cfs_spin_lock(&rs->rs_lock);
2204         if (rs->rs_transno <= exp->exp_last_committed ||
2205             (!rs->rs_on_net && !rs->rs_no_ack) ||
2206              cfs_list_empty(&rs->rs_exp_list) ||     /* completed already */
2207              cfs_list_empty(&rs->rs_obd_list)) {
2208                 CDEBUG(D_HA, "Schedule reply immediately\n");
2209                 ptlrpc_dispatch_difficult_reply(rs);
2210         } else {
2211                 cfs_list_add (&rs->rs_list, &svc->srv_active_replies);
2212                 rs->rs_scheduled = 0;           /* allow notifier to schedule */
2213         }
2214         cfs_spin_unlock(&rs->rs_lock);
2215         cfs_spin_unlock(&svc->srv_lock);
2216         EXIT;
2217 }
2218
2219 int target_handle_ping(struct ptlrpc_request *req)
2220 {
2221         obd_ping(req->rq_export);
2222         return req_capsule_server_pack(&req->rq_pill);
2223 }
2224
2225 void target_committed_to_req(struct ptlrpc_request *req)
2226 {
2227         struct obd_export *exp = req->rq_export;
2228
2229         if (!exp->exp_obd->obd_no_transno && req->rq_repmsg != NULL)
2230                 lustre_msg_set_last_committed(req->rq_repmsg,
2231                                               exp->exp_last_committed);
2232         else
2233                 DEBUG_REQ(D_IOCTL, req, "not sending last_committed update (%d/"
2234                           "%d)", exp->exp_obd->obd_no_transno,
2235                           req->rq_repmsg == NULL);
2236
2237         CDEBUG(D_INFO, "last_committed "LPU64", transno "LPU64", xid "LPU64"\n",
2238                exp->exp_last_committed, req->rq_transno, req->rq_xid);
2239 }
2240 EXPORT_SYMBOL(target_committed_to_req);
2241
2242 int target_handle_qc_callback(struct ptlrpc_request *req)
2243 {
2244         struct obd_quotactl *oqctl;
2245         struct client_obd *cli = &req->rq_export->exp_obd->u.cli;
2246
2247         oqctl = req_capsule_client_get(&req->rq_pill, &RMF_OBD_QUOTACTL);
2248         if (oqctl == NULL) {
2249                 CERROR("Can't unpack obd_quotactl\n");
2250                 RETURN(-EPROTO);
2251         }
2252
2253         cli->cl_qchk_stat = oqctl->qc_stat;
2254
2255         return 0;
2256 }
2257
2258 #ifdef HAVE_QUOTA_SUPPORT
2259 int target_handle_dqacq_callback(struct ptlrpc_request *req)
2260 {
2261 #ifdef __KERNEL__
2262         struct obd_device *obd = req->rq_export->exp_obd;
2263         struct obd_device *master_obd = NULL, *lov_obd = NULL;
2264         struct obd_device_target *obt;
2265         struct lustre_quota_ctxt *qctxt;
2266         struct qunit_data *qdata = NULL;
2267         int rc = 0;
2268         ENTRY;
2269
2270         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_DROP_QUOTA_REQ))
2271                 RETURN(rc);
2272
2273         rc = req_capsule_server_pack(&req->rq_pill);
2274         if (rc) {
2275                 CERROR("packing reply failed!: rc = %d\n", rc);
2276                 RETURN(rc);
2277         }
2278
2279         LASSERT(req->rq_export);
2280
2281         qdata = quota_get_qdata(req, QUOTA_REQUEST, QUOTA_EXPORT);
2282         if (IS_ERR(qdata)) {
2283                 rc = PTR_ERR(qdata);
2284                 CDEBUG(D_ERROR, "Can't unpack qunit_data(rc: %d)\n", rc);
2285                 req->rq_status = rc;
2286                 GOTO(out, rc);
2287         }
2288
2289         /* we use the observer */
2290         if (obd_pin_observer(obd, &lov_obd) ||
2291             obd_pin_observer(lov_obd, &master_obd)) {
2292                 CERROR("Can't find the observer, it is recovering\n");
2293                 req->rq_status = -EAGAIN;
2294                 GOTO(out, rc);
2295         }
2296
2297         obt = &master_obd->u.obt;
2298         qctxt = &obt->obt_qctxt;
2299
2300         if (!qctxt->lqc_setup || !qctxt->lqc_valid) {
2301                 /* quota_type has not been processed yet, return EAGAIN
2302                  * until we know whether or not quotas are supposed to
2303                  * be enabled */
2304                 CDEBUG(D_QUOTA, "quota_type not processed yet, return "
2305                        "-EAGAIN\n");
2306                 req->rq_status = -EAGAIN;
2307                 GOTO(out, rc);
2308         }
2309
2310         cfs_down_read(&obt->obt_rwsem);
2311         if (qctxt->lqc_lqs_hash == NULL) {
2312                 cfs_up_read(&obt->obt_rwsem);
2313                 /* quota_type has not been processed yet, return EAGAIN
2314                  * until we know whether or not quotas are supposed to
2315                  * be enabled */
2316                 CDEBUG(D_QUOTA, "quota_ctxt is not ready yet, return "
2317                        "-EAGAIN\n");
2318                 req->rq_status = -EAGAIN;
2319                 GOTO(out, rc);
2320         }
2321
2322         LASSERT(qctxt->lqc_handler);
2323         rc = qctxt->lqc_handler(master_obd, qdata,
2324                                 lustre_msg_get_opc(req->rq_reqmsg));
2325         cfs_up_read(&obt->obt_rwsem);
2326         if (rc && rc != -EDQUOT)
2327                 CDEBUG(rc == -EBUSY  ? D_QUOTA : D_ERROR,
2328                        "dqacq/dqrel failed! (rc:%d)\n", rc);
2329         req->rq_status = rc;
2330
2331         rc = quota_copy_qdata(req, qdata, QUOTA_REPLY, QUOTA_EXPORT);
2332         if (rc < 0) {
2333                 CERROR("Can't pack qunit_data(rc: %d)\n", rc);
2334                 GOTO(out, rc);
2335         }
2336
2337         /* Block the quota req. b=14840 */
2338         OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_BLOCK_QUOTA_REQ, obd_timeout);
2339         EXIT;
2340
2341 out:
2342         if (master_obd)
2343                 obd_unpin_observer(lov_obd);
2344         if (lov_obd)
2345                 obd_unpin_observer(obd);
2346
2347         rc = ptlrpc_reply(req);
2348         return rc;
2349 #else
2350         return 0;
2351 #endif /* !__KERNEL__ */
2352 }
2353 #endif /* HAVE_QUOTA_SUPPORT */
2354
2355 ldlm_mode_t lck_compat_array[] = {
2356         [LCK_EX] LCK_COMPAT_EX,
2357         [LCK_PW] LCK_COMPAT_PW,
2358         [LCK_PR] LCK_COMPAT_PR,
2359         [LCK_CW] LCK_COMPAT_CW,
2360         [LCK_CR] LCK_COMPAT_CR,
2361         [LCK_NL] LCK_COMPAT_NL,
2362         [LCK_GROUP] LCK_COMPAT_GROUP,
2363         [LCK_COS] LCK_COMPAT_COS,
2364 };
2365
2366 /**
2367  * Rather arbitrary mapping from LDLM error codes to errno values. This should
2368  * not escape to the user level.
2369  */
2370 int ldlm_error2errno(ldlm_error_t error)
2371 {
2372         int result;
2373
2374         switch (error) {
2375         case ELDLM_OK:
2376                 result = 0;
2377                 break;
2378         case ELDLM_LOCK_CHANGED:
2379                 result = -ESTALE;
2380                 break;
2381         case ELDLM_LOCK_ABORTED:
2382                 result = -ENAVAIL;
2383                 break;
2384         case ELDLM_LOCK_REPLACED:
2385                 result = -ESRCH;
2386                 break;
2387         case ELDLM_NO_LOCK_DATA:
2388                 result = -ENOENT;
2389                 break;
2390         case ELDLM_NAMESPACE_EXISTS:
2391                 result = -EEXIST;
2392                 break;
2393         case ELDLM_BAD_NAMESPACE:
2394                 result = -EBADF;
2395                 break;
2396         default:
2397                 if (((int)error) < 0)  /* cast to signed type */
2398                         result = error; /* as ldlm_error_t can be unsigned */
2399                 else {
2400                         CERROR("Invalid DLM result code: %d\n", error);
2401                         result = -EPROTO;
2402                 }
2403         }
2404         return result;
2405 }
2406 EXPORT_SYMBOL(ldlm_error2errno);
2407
2408 /**
2409  * Dual to ldlm_error2errno(): maps errno values back to ldlm_error_t.
2410  */
2411 ldlm_error_t ldlm_errno2error(int err_no)
2412 {
2413         int error;
2414
2415         switch (err_no) {
2416         case 0:
2417                 error = ELDLM_OK;
2418                 break;
2419         case -ESTALE:
2420                 error = ELDLM_LOCK_CHANGED;
2421                 break;
2422         case -ENAVAIL:
2423                 error = ELDLM_LOCK_ABORTED;
2424                 break;
2425         case -ESRCH:
2426                 error = ELDLM_LOCK_REPLACED;
2427                 break;
2428         case -ENOENT:
2429                 error = ELDLM_NO_LOCK_DATA;
2430                 break;
2431         case -EEXIST:
2432                 error = ELDLM_NAMESPACE_EXISTS;
2433                 break;
2434         case -EBADF:
2435                 error = ELDLM_BAD_NAMESPACE;
2436                 break;
2437         default:
2438                 error = err_no;
2439         }
2440         return error;
2441 }
2442 EXPORT_SYMBOL(ldlm_errno2error);
2443
2444 #if LUSTRE_TRACKS_LOCK_EXP_REFS
2445 void ldlm_dump_export_locks(struct obd_export *exp)
2446 {
2447         cfs_spin_lock(&exp->exp_locks_list_guard);
2448         if (!cfs_list_empty(&exp->exp_locks_list)) {
2449             struct ldlm_lock *lock;
2450
2451             CERROR("dumping locks for export %p,"
2452                    "ignore if the unmount doesn't hang\n", exp);
2453             cfs_list_for_each_entry(lock, &exp->exp_locks_list, l_exp_refs_link)
2454                 ldlm_lock_dump(D_ERROR, lock, 0);
2455         }
2456         cfs_spin_unlock(&exp->exp_locks_list_guard);
2457 }
2458 #endif