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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  2008 Sun Microsystems, Inc. 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         cfs_atomic_set(&cli->cl_quota_resends, CLIENT_QUOTA_DEFAULT_RESENDS);
309
310         /* This value may be changed at connect time in
311            ptlrpc_connect_interpret. */
312         cli->cl_max_pages_per_rpc = min((int)PTLRPC_MAX_BRW_PAGES,
313                                         (int)(1024 * 1024 >> CFS_PAGE_SHIFT));
314
315         if (!strcmp(name, LUSTRE_MDC_NAME)) {
316                 cli->cl_max_rpcs_in_flight = MDC_MAX_RIF_DEFAULT;
317         } else if (cfs_num_physpages >> (20 - CFS_PAGE_SHIFT) <= 128 /* MB */) {
318                 cli->cl_max_rpcs_in_flight = 2;
319         } else if (cfs_num_physpages >> (20 - CFS_PAGE_SHIFT) <= 256 /* MB */) {
320                 cli->cl_max_rpcs_in_flight = 3;
321         } else if (cfs_num_physpages >> (20 - CFS_PAGE_SHIFT) <= 512 /* MB */) {
322                 cli->cl_max_rpcs_in_flight = 4;
323         } else {
324                 cli->cl_max_rpcs_in_flight = OSC_MAX_RIF_DEFAULT;
325         }
326
327         rc = ldlm_get_ref();
328         if (rc) {
329                 CERROR("ldlm_get_ref failed: %d\n", rc);
330                 GOTO(err, rc);
331         }
332
333         ptlrpc_init_client(rq_portal, rp_portal, name,
334                            &obddev->obd_ldlm_client);
335
336         imp = class_new_import(obddev);
337         if (imp == NULL)
338                 GOTO(err_ldlm, rc = -ENOENT);
339         imp->imp_client = &obddev->obd_ldlm_client;
340         imp->imp_connect_op = connect_op;
341         imp->imp_initial_recov = 1;
342         imp->imp_initial_recov_bk = 0;
343         CFS_INIT_LIST_HEAD(&imp->imp_pinger_chain);
344         memcpy(cli->cl_target_uuid.uuid, lustre_cfg_buf(lcfg, 1),
345                LUSTRE_CFG_BUFLEN(lcfg, 1));
346         class_import_put(imp);
347
348         rc = client_import_add_conn(imp, &server_uuid, 1);
349         if (rc) {
350                 CERROR("can't add initial connection\n");
351                 GOTO(err_import, rc);
352         }
353
354         cli->cl_import = imp;
355         /* cli->cl_max_mds_{easize,cookiesize} updated by mdc_init_ea_size() */
356         cli->cl_max_mds_easize = sizeof(struct lov_mds_md_v3);
357         cli->cl_max_mds_cookiesize = sizeof(struct llog_cookie);
358
359         if (LUSTRE_CFG_BUFLEN(lcfg, 3) > 0) {
360                 if (!strcmp(lustre_cfg_string(lcfg, 3), "inactive")) {
361                         CDEBUG(D_HA, "marking %s %s->%s as inactive\n",
362                                name, obddev->obd_name,
363                                cli->cl_target_uuid.uuid);
364                         cfs_spin_lock(&imp->imp_lock);
365                         imp->imp_deactive = 1;
366                         cfs_spin_unlock(&imp->imp_lock);
367                 }
368         }
369
370         obddev->obd_namespace = ldlm_namespace_new(obddev, obddev->obd_name,
371                                                    LDLM_NAMESPACE_CLIENT,
372                                                    LDLM_NAMESPACE_GREEDY);
373         if (obddev->obd_namespace == NULL) {
374                 CERROR("Unable to create client namespace - %s\n",
375                        obddev->obd_name);
376                 GOTO(err_import, rc = -ENOMEM);
377         }
378
379         cli->cl_qchk_stat = CL_NOT_QUOTACHECKED;
380
381         RETURN(rc);
382
383 err_import:
384         class_destroy_import(imp);
385 err_ldlm:
386         ldlm_put_ref();
387 err:
388         RETURN(rc);
389
390 }
391
392 int client_obd_cleanup(struct obd_device *obddev)
393 {
394         ENTRY;
395
396         ldlm_namespace_free_post(obddev->obd_namespace);
397         obddev->obd_namespace = NULL;
398
399         ldlm_put_ref();
400         RETURN(0);
401 }
402
403 /* ->o_connect() method for client side (OSC and MDC and MGC) */
404 int client_connect_import(const struct lu_env *env,
405                           struct obd_export **exp,
406                           struct obd_device *obd, struct obd_uuid *cluuid,
407                           struct obd_connect_data *data, void *localdata)
408 {
409         struct client_obd *cli = &obd->u.cli;
410         struct obd_import *imp = cli->cl_import;
411         struct obd_connect_data *ocd;
412         struct lustre_handle conn = { 0 };
413         int rc;
414         ENTRY;
415
416         *exp = NULL;
417         cfs_down_write(&cli->cl_sem);
418         if (cli->cl_conn_count > 0 )
419                 GOTO(out_sem, rc = -EALREADY);
420
421         rc = class_connect(&conn, obd, cluuid);
422         if (rc)
423                 GOTO(out_sem, rc);
424
425         cli->cl_conn_count++;
426         *exp = class_conn2export(&conn);
427
428         LASSERT(obd->obd_namespace);
429
430         imp->imp_dlm_handle = conn;
431         rc = ptlrpc_init_import(imp);
432         if (rc != 0)
433                 GOTO(out_ldlm, rc);
434
435         ocd = &imp->imp_connect_data;
436         if (data) {
437                 *ocd = *data;
438                 imp->imp_connect_flags_orig = data->ocd_connect_flags;
439         }
440
441         rc = ptlrpc_connect_import(imp, NULL);
442         if (rc != 0) {
443                 LASSERT (imp->imp_state == LUSTRE_IMP_DISCON);
444                 GOTO(out_ldlm, rc);
445         }
446         LASSERT((*exp)->exp_connection);
447
448         if (data) {
449                 LASSERTF((ocd->ocd_connect_flags & data->ocd_connect_flags) ==
450                          ocd->ocd_connect_flags, "old "LPX64", new "LPX64"\n",
451                          data->ocd_connect_flags, ocd->ocd_connect_flags);
452                 data->ocd_connect_flags = ocd->ocd_connect_flags;
453         }
454
455         ptlrpc_pinger_add_import(imp);
456
457         EXIT;
458
459         if (rc) {
460 out_ldlm:
461                 cli->cl_conn_count--;
462                 class_disconnect(*exp);
463                 *exp = NULL;
464         }
465 out_sem:
466         cfs_up_write(&cli->cl_sem);
467
468         return rc;
469 }
470
471 int client_disconnect_export(struct obd_export *exp)
472 {
473         struct obd_device *obd = class_exp2obd(exp);
474         struct client_obd *cli;
475         struct obd_import *imp;
476         int rc = 0, err;
477         ENTRY;
478
479         if (!obd) {
480                 CERROR("invalid export for disconnect: exp %p cookie "LPX64"\n",
481                        exp, exp ? exp->exp_handle.h_cookie : -1);
482                 RETURN(-EINVAL);
483         }
484
485         cli = &obd->u.cli;
486         imp = cli->cl_import;
487
488         cfs_down_write(&cli->cl_sem);
489         CDEBUG(D_INFO, "disconnect %s - %d\n", obd->obd_name,
490                cli->cl_conn_count);
491
492         if (!cli->cl_conn_count) {
493                 CERROR("disconnecting disconnected device (%s)\n",
494                        obd->obd_name);
495                 GOTO(out_disconnect, rc = -EINVAL);
496         }
497
498         cli->cl_conn_count--;
499         if (cli->cl_conn_count)
500                 GOTO(out_disconnect, rc = 0);
501
502         /* Mark import deactivated now, so we don't try to reconnect if any
503          * of the cleanup RPCs fails (e.g. ldlm cancel, etc).  We don't
504          * fully deactivate the import, or that would drop all requests. */
505         cfs_spin_lock(&imp->imp_lock);
506         imp->imp_deactive = 1;
507         cfs_spin_unlock(&imp->imp_lock);
508
509         /* Some non-replayable imports (MDS's OSCs) are pinged, so just
510          * delete it regardless.  (It's safe to delete an import that was
511          * never added.) */
512         (void)ptlrpc_pinger_del_import(imp);
513
514         if (obd->obd_namespace != NULL) {
515                 /* obd_force == local only */
516                 ldlm_cli_cancel_unused(obd->obd_namespace, NULL,
517                                        obd->obd_force ? LDLM_FL_LOCAL_ONLY:0,
518                                        NULL);
519                 ldlm_namespace_free_prior(obd->obd_namespace, imp, obd->obd_force);
520         }
521
522         /*
523          * there's no need to hold sem during disconnecting an import,
524          * and actually it may cause deadlock in gss.
525          */
526         cfs_up_write(&cli->cl_sem);
527         rc = ptlrpc_disconnect_import(imp, 0);
528         cfs_down_write(&cli->cl_sem);
529
530         ptlrpc_invalidate_import(imp);
531
532         if (imp->imp_rq_pool) {
533                 ptlrpc_free_rq_pool(imp->imp_rq_pool);
534                 imp->imp_rq_pool = NULL;
535         }
536         client_destroy_import(imp);
537         cli->cl_import = NULL;
538
539         EXIT;
540
541  out_disconnect:
542         /* use server style - class_disconnect should be always called for
543          * o_disconnect */
544         err = class_disconnect(exp);
545         if (!rc && err)
546                 rc = err;
547
548         cfs_up_write(&cli->cl_sem);
549
550         RETURN(rc);
551 }
552
553 int server_disconnect_export(struct obd_export *exp)
554 {
555         int rc;
556         ENTRY;
557
558         /* Disconnect early so that clients can't keep using export */
559         rc = class_disconnect(exp);
560         /* close import for avoid sending any requests */
561         if (exp->exp_imp_reverse)
562                 ptlrpc_cleanup_imp(exp->exp_imp_reverse);
563
564         if (exp->exp_obd->obd_namespace != NULL)
565                 ldlm_cancel_locks_for_export(exp);
566
567         /* complete all outstanding replies */
568         cfs_spin_lock(&exp->exp_lock);
569         while (!cfs_list_empty(&exp->exp_outstanding_replies)) {
570                 struct ptlrpc_reply_state *rs =
571                         cfs_list_entry(exp->exp_outstanding_replies.next,
572                                        struct ptlrpc_reply_state, rs_exp_list);
573                 struct ptlrpc_service *svc = rs->rs_service;
574
575                 cfs_spin_lock(&svc->srv_lock);
576                 cfs_list_del_init(&rs->rs_exp_list);
577                 cfs_spin_lock(&rs->rs_lock);
578                 ptlrpc_schedule_difficult_reply(rs);
579                 cfs_spin_unlock(&rs->rs_lock);
580                 cfs_spin_unlock(&svc->srv_lock);
581         }
582         cfs_spin_unlock(&exp->exp_lock);
583
584         /* release nid stat refererence */
585         lprocfs_exp_cleanup(exp);
586
587         RETURN(rc);
588 }
589
590 /* --------------------------------------------------------------------------
591  * from old lib/target.c
592  * -------------------------------------------------------------------------- */
593
594 static int target_handle_reconnect(struct lustre_handle *conn,
595                                    struct obd_export *exp,
596                                    struct obd_uuid *cluuid)
597 {
598         ENTRY;
599         if (exp->exp_connection && exp->exp_imp_reverse) {
600                 struct lustre_handle *hdl;
601                 hdl = &exp->exp_imp_reverse->imp_remote_handle;
602                 /* Might be a re-connect after a partition. */
603                 if (!memcmp(&conn->cookie, &hdl->cookie, sizeof conn->cookie)) {
604                         CWARN("%s: %s reconnecting\n", exp->exp_obd->obd_name,
605                               cluuid->uuid);
606                         conn->cookie = exp->exp_handle.h_cookie;
607                         /* target_handle_connect() treats EALREADY and
608                          * -EALREADY differently.  EALREADY means we are
609                          * doing a valid reconnect from the same client. */
610                         RETURN(EALREADY);
611                 } else {
612                         CERROR("%s reconnecting from %s, "
613                                "handle mismatch (ours "LPX64", theirs "
614                                LPX64")\n", cluuid->uuid,
615                                exp->exp_connection->c_remote_uuid.uuid,
616                                hdl->cookie, conn->cookie);
617                         memset(conn, 0, sizeof *conn);
618                         /* target_handle_connect() treats EALREADY and
619                          * -EALREADY differently.  -EALREADY is an error
620                          * (same UUID, different handle). */
621                         RETURN(-EALREADY);
622                 }
623         }
624
625         conn->cookie = exp->exp_handle.h_cookie;
626         CDEBUG(D_HA, "connect export for UUID '%s' at %p, cookie "LPX64"\n",
627                cluuid->uuid, exp, conn->cookie);
628         RETURN(0);
629 }
630
631 void target_client_add_cb(struct obd_device *obd, __u64 transno, void *cb_data,
632                           int error)
633 {
634         struct obd_export *exp = cb_data;
635
636         CDEBUG(D_RPCTRACE, "%s: committing for initial connect of %s\n",
637                obd->obd_name, exp->exp_client_uuid.uuid);
638
639         cfs_spin_lock(&exp->exp_lock);
640         exp->exp_need_sync = 0;
641         cfs_spin_unlock(&exp->exp_lock);
642         class_export_cb_put(exp);
643 }
644 EXPORT_SYMBOL(target_client_add_cb);
645
646 static void
647 target_start_and_reset_recovery_timer(struct obd_device *obd,
648                                       struct ptlrpc_request *req,
649                                       int new_client);
650
651 int target_handle_connect(struct ptlrpc_request *req)
652 {
653         struct obd_device *target, *targref = NULL;
654         struct obd_export *export = NULL;
655         struct obd_import *revimp;
656         struct lustre_handle conn;
657         struct lustre_handle *tmp;
658         struct obd_uuid tgtuuid;
659         struct obd_uuid cluuid;
660         struct obd_uuid remote_uuid;
661         char *str;
662         int rc = 0;
663         int mds_conn = 0;
664         struct obd_connect_data *data, *tmpdata;
665         lnet_nid_t *client_nid = NULL;
666         ENTRY;
667
668         OBD_RACE(OBD_FAIL_TGT_CONN_RACE);
669
670         str = req_capsule_client_get(&req->rq_pill, &RMF_TGTUUID);
671         if (str == NULL) {
672                 DEBUG_REQ(D_ERROR, req, "bad target UUID for connect");
673                 GOTO(out, rc = -EINVAL);
674         }
675
676         obd_str2uuid(&tgtuuid, str);
677         target = class_uuid2obd(&tgtuuid);
678         if (!target)
679                 target = class_name2obd(str);
680
681         if (!target || target->obd_stopping || !target->obd_set_up) {
682                 LCONSOLE_ERROR_MSG(0x137, "UUID '%s' is not available "
683                                    " for connect (%s)\n", str,
684                                    !target ? "no target" :
685                                    (target->obd_stopping ? "stopping" :
686                                    "not set up"));
687                 GOTO(out, rc = -ENODEV);
688         }
689
690         if (target->obd_no_conn) {
691                 LCONSOLE_WARN("%s: temporarily refusing client connection "
692                               "from %s\n", target->obd_name,
693                               libcfs_nid2str(req->rq_peer.nid));
694                 GOTO(out, rc = -EAGAIN);
695         }
696
697         /* Make sure the target isn't cleaned up while we're here. Yes,
698            there's still a race between the above check and our incref here.
699            Really, class_uuid2obd should take the ref. */
700         targref = class_incref(target, __FUNCTION__, cfs_current());
701
702
703         str = req_capsule_client_get(&req->rq_pill, &RMF_CLUUID);
704         if (str == NULL) {
705                 DEBUG_REQ(D_ERROR, req, "bad client UUID for connect");
706                 GOTO(out, rc = -EINVAL);
707         }
708
709         obd_str2uuid(&cluuid, str);
710
711         /* XXX extract a nettype and format accordingly */
712         switch (sizeof(lnet_nid_t)) {
713                 /* NB the casts only avoid compiler warnings */
714         case 8:
715                 snprintf(remote_uuid.uuid, sizeof remote_uuid,
716                          "NET_"LPX64"_UUID", (__u64)req->rq_peer.nid);
717                 break;
718         case 4:
719                 snprintf(remote_uuid.uuid, sizeof remote_uuid,
720                          "NET_%x_UUID", (__u32)req->rq_peer.nid);
721                 break;
722         default:
723                 LBUG();
724         }
725
726         tmp = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
727         if (tmp == NULL)
728                 GOTO(out, rc = -EPROTO);
729
730         conn = *tmp;
731
732         data = req_capsule_client_get(&req->rq_pill, &RMF_CONNECT_DATA);
733         if (!data)
734                 GOTO(out, rc = -EPROTO);
735
736         rc = req_capsule_server_pack(&req->rq_pill);
737         if (rc)
738                 GOTO(out, rc);
739
740         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
741                 if (!data) {
742                         DEBUG_REQ(D_WARNING, req, "Refusing old (unversioned) "
743                                   "libclient connection attempt");
744                         GOTO(out, rc = -EPROTO);
745                 } else if (data->ocd_version < LUSTRE_VERSION_CODE -
746                                                LUSTRE_VERSION_ALLOWED_OFFSET ||
747                            data->ocd_version > LUSTRE_VERSION_CODE +
748                                                LUSTRE_VERSION_ALLOWED_OFFSET) {
749                         DEBUG_REQ(D_WARNING, req, "Refusing %s (%d.%d.%d.%d) "
750                                   "libclient connection attempt",
751                                   data->ocd_version < LUSTRE_VERSION_CODE ?
752                                   "old" : "new",
753                                   OBD_OCD_VERSION_MAJOR(data->ocd_version),
754                                   OBD_OCD_VERSION_MINOR(data->ocd_version),
755                                   OBD_OCD_VERSION_PATCH(data->ocd_version),
756                                   OBD_OCD_VERSION_FIX(data->ocd_version));
757                         data = req_capsule_server_sized_get(&req->rq_pill,
758                                                         &RMF_CONNECT_DATA,
759                                     offsetof(typeof(*data), ocd_version) +
760                                              sizeof(data->ocd_version));
761                         if (data) {
762                                 data->ocd_connect_flags = OBD_CONNECT_VERSION;
763                                 data->ocd_version = LUSTRE_VERSION_CODE;
764                         }
765                         GOTO(out, rc = -EPROTO);
766                 }
767         }
768
769         if ((lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_INITIAL) &&
770             (data->ocd_connect_flags & OBD_CONNECT_MDS))
771                 mds_conn = 1;
772
773         /* lctl gets a backstage, all-access pass. */
774         if (obd_uuid_equals(&cluuid, &target->obd_uuid))
775                 goto dont_check_exports;
776
777         export = cfs_hash_lookup(target->obd_uuid_hash, &cluuid);
778         if (!export)
779                 goto no_export;
780
781         /* we've found an export in the hash */
782         if (export->exp_connecting) { /* bug 9635, et. al. */
783                 CWARN("%s: exp %p already connecting\n",
784                       export->exp_obd->obd_name, export);
785                 class_export_put(export);
786                 export = NULL;
787                 rc = -EALREADY;
788         } else if (mds_conn && export->exp_connection) {
789                 if (req->rq_peer.nid != export->exp_connection->c_peer.nid)
790                         /* mds reconnected after failover */
791                         CWARN("%s: received MDS connection from NID %s,"
792                               " removing former export from NID %s\n",
793                             target->obd_name, libcfs_nid2str(req->rq_peer.nid),
794                             libcfs_nid2str(export->exp_connection->c_peer.nid));
795                 else
796                         /* new mds connection from the same nid */
797                         CWARN("%s: received new MDS connection from NID %s,"
798                               " removing former export from same NID\n",
799                             target->obd_name, libcfs_nid2str(req->rq_peer.nid));
800                 class_fail_export(export);
801                 class_export_put(export);
802                 export = NULL;
803                 rc = 0;
804         } else if (export->exp_connection != NULL &&
805                    req->rq_peer.nid != export->exp_connection->c_peer.nid &&
806                    (lustre_msg_get_op_flags(req->rq_reqmsg) &
807                     MSG_CONNECT_INITIAL)) {
808                 /* in mds failover we have static uuid but nid can be
809                  * changed*/
810                 CWARN("%s: cookie %s seen on new NID %s when "
811                       "existing NID %s is already connected\n",
812                       target->obd_name, cluuid.uuid,
813                       libcfs_nid2str(req->rq_peer.nid),
814                       libcfs_nid2str(export->exp_connection->c_peer.nid));
815                 rc = -EALREADY;
816                 class_export_put(export);
817                 export = NULL;
818         } else {
819                 cfs_spin_lock(&export->exp_lock);
820                 export->exp_connecting = 1;
821                 cfs_spin_unlock(&export->exp_lock);
822                 class_export_put(export);
823                 LASSERT(export->exp_obd == target);
824
825                 rc = target_handle_reconnect(&conn, export, &cluuid);
826         }
827
828         /* If we found an export, we already unlocked. */
829         if (!export) {
830 no_export:
831                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_CONNECT, 2 * obd_timeout);
832         } else if (req->rq_export == NULL &&
833                    cfs_atomic_read(&export->exp_rpc_count) > 0) {
834                 CWARN("%s: refuse connection from %s/%s to 0x%p/%d\n",
835                       target->obd_name, cluuid.uuid,
836                       libcfs_nid2str(req->rq_peer.nid),
837                       export, cfs_atomic_read(&export->exp_refcount));
838                 GOTO(out, rc = -EBUSY);
839         } else if (req->rq_export != NULL &&
840                    (cfs_atomic_read(&export->exp_rpc_count) > 1)) {
841                 /* the current connect rpc has increased exp_rpc_count */
842                 CWARN("%s: refuse reconnection from %s@%s to 0x%p/%d\n",
843                       target->obd_name, cluuid.uuid,
844                       libcfs_nid2str(req->rq_peer.nid),
845                       export, cfs_atomic_read(&export->exp_rpc_count) - 1);
846                 cfs_spin_lock(&export->exp_lock);
847                 if (req->rq_export->exp_conn_cnt <
848                     lustre_msg_get_conn_cnt(req->rq_reqmsg))
849                         /* try to abort active requests */
850                         req->rq_export->exp_abort_active_req = 1;
851                 cfs_spin_unlock(&export->exp_lock);
852                 GOTO(out, rc = -EBUSY);
853         } else if (lustre_msg_get_conn_cnt(req->rq_reqmsg) == 1) {
854                 CERROR("%s: NID %s (%s) reconnected with 1 conn_cnt; "
855                        "cookies not random?\n", target->obd_name,
856                        libcfs_nid2str(req->rq_peer.nid), cluuid.uuid);
857                 GOTO(out, rc = -EALREADY);
858         } else {
859                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_RECONNECT, 2 * obd_timeout);
860         }
861
862         if (rc < 0) {
863                 GOTO(out, rc);
864         }
865
866         CWARN("%s: connection from %s@%s %st"LPU64" exp %p cur %ld last %ld\n",
867                target->obd_name, cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
868               target->obd_recovering ? "recovering/" : "", data->ocd_transno,
869               export, (long)cfs_time_current_sec(),
870               export ? (long)export->exp_last_request_time : 0);
871
872         /* Tell the client if we're in recovery. */
873         if (target->obd_recovering) {
874                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECOVERING);
875                 /* If this is the first time a client connects,
876                    reset the recovery timer */
877                 if (rc == 0)
878                         target_start_and_reset_recovery_timer(target, req,
879                                                               !export);
880         }
881
882         /* We want to handle EALREADY but *not* -EALREADY from
883          * target_handle_reconnect(), return reconnection state in a flag */
884         if (rc == EALREADY) {
885                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECONNECT);
886                 rc = 0;
887         } else {
888                 LASSERT(rc == 0);
889         }
890
891         /* Tell the client if we support replayable requests */
892         if (target->obd_replayable)
893                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_REPLAYABLE);
894         client_nid = &req->rq_peer.nid;
895
896         if (export == NULL) {
897                 if (target->obd_recovering) {
898                         cfs_time_t t;
899
900                         t = cfs_timer_deadline(&target->obd_recovery_timer);
901                         t = cfs_time_sub(t, cfs_time_current());
902                         CERROR("%s: denying connection for new client %s (%s): "
903                                "%d clients in recovery for "CFS_TIME_T"s\n",
904                                target->obd_name,
905                                libcfs_nid2str(req->rq_peer.nid), cluuid.uuid,
906                                cfs_atomic_read(&target-> \
907                                                obd_lock_replay_clients),
908                                cfs_duration_sec(t));
909                         rc = -EBUSY;
910                 } else {
911 dont_check_exports:
912                         rc = obd_connect(req->rq_svc_thread->t_env,
913                                          &export, target, &cluuid, data,
914                                          client_nid);
915                         if (rc == 0)
916                                 conn.cookie = export->exp_handle.h_cookie;
917                 }
918         } else {
919                 rc = obd_reconnect(req->rq_svc_thread->t_env,
920                                    export, target, &cluuid, data, client_nid);
921                 if (rc == 0)
922                         /* prevous done via class_conn2export */
923                         class_export_get(export);
924         }
925         if (rc)
926                 GOTO(out, rc);
927         /* Return only the parts of obd_connect_data that we understand, so the
928          * client knows that we don't understand the rest. */
929         if (data) {
930                  tmpdata = req_capsule_server_get(&req->rq_pill,
931                                                   &RMF_CONNECT_DATA);
932                   //data->ocd_connect_flags &= OBD_CONNECT_SUPPORTED;
933                  *tmpdata = *data;
934         }
935
936         /* If all else goes well, this is our RPC return code. */
937         req->rq_status = 0;
938
939         lustre_msg_set_handle(req->rq_repmsg, &conn);
940
941         /* If the client and the server are the same node, we will already
942          * have an export that really points to the client's DLM export,
943          * because we have a shared handles table.
944          *
945          * XXX this will go away when shaver stops sending the "connect" handle
946          * in the real "remote handle" field of the request --phik 24 Apr 2003
947          */
948         if (req->rq_export != NULL)
949                 class_export_put(req->rq_export);
950
951         req->rq_export = export;
952
953         cfs_spin_lock(&export->exp_lock);
954         if (export->exp_conn_cnt >= lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
955                 cfs_spin_unlock(&export->exp_lock);
956                 CERROR("%s: %s already connected at higher conn_cnt: %d > %d\n",
957                        cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
958                        export->exp_conn_cnt,
959                        lustre_msg_get_conn_cnt(req->rq_reqmsg));
960
961                 GOTO(out, rc = -EALREADY);
962         }
963         LASSERT(lustre_msg_get_conn_cnt(req->rq_reqmsg) > 0);
964         export->exp_conn_cnt = lustre_msg_get_conn_cnt(req->rq_reqmsg);
965         export->exp_abort_active_req = 0;
966
967         /* request from liblustre?  Don't evict it for not pinging. */
968         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
969                 export->exp_libclient = 1;
970                 cfs_spin_unlock(&export->exp_lock);
971
972                 cfs_spin_lock(&target->obd_dev_lock);
973                 cfs_list_del_init(&export->exp_obd_chain_timed);
974                 cfs_spin_unlock(&target->obd_dev_lock);
975         } else {
976                 cfs_spin_unlock(&export->exp_lock);
977         }
978
979         if (export->exp_connection != NULL) {
980                 /* Check to see if connection came from another NID */
981                 if ((export->exp_connection->c_peer.nid != req->rq_peer.nid) &&
982                     !cfs_hlist_unhashed(&export->exp_nid_hash))
983                         cfs_hash_del(export->exp_obd->obd_nid_hash,
984                                      &export->exp_connection->c_peer.nid,
985                                      &export->exp_nid_hash);
986
987                 ptlrpc_connection_put(export->exp_connection);
988         }
989
990         export->exp_connection = ptlrpc_connection_get(req->rq_peer,
991                                                        req->rq_self,
992                                                        &remote_uuid);
993         if (cfs_hlist_unhashed(&export->exp_nid_hash)) {
994                 cfs_hash_add_unique(export->exp_obd->obd_nid_hash,
995                                     &export->exp_connection->c_peer.nid,
996                                     &export->exp_nid_hash);
997         }
998
999         cfs_spin_lock_bh(&target->obd_processing_task_lock);
1000         if (target->obd_recovering && !export->exp_in_recovery) {
1001                 cfs_spin_lock(&export->exp_lock);
1002                 export->exp_in_recovery = 1;
1003                 export->exp_req_replay_needed = 1;
1004                 export->exp_lock_replay_needed = 1;
1005                 cfs_spin_unlock(&export->exp_lock);
1006                 if ((lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_TRANSNO)
1007                      && (data->ocd_transno == 0))
1008                         CWARN("Connect with zero transno!\n");
1009
1010                 if ((lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_TRANSNO)
1011                      && data->ocd_transno < target->obd_next_recovery_transno)
1012                         target->obd_next_recovery_transno = data->ocd_transno;
1013                 target->obd_connected_clients++;
1014                 cfs_atomic_inc(&target->obd_req_replay_clients);
1015                 cfs_atomic_inc(&target->obd_lock_replay_clients);
1016                 if (target->obd_connected_clients ==
1017                     target->obd_max_recoverable_clients)
1018                         cfs_waitq_signal(&target->obd_next_transno_waitq);
1019         }
1020         cfs_spin_unlock_bh(&target->obd_processing_task_lock);
1021         tmp = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
1022         conn = *tmp;
1023
1024         if (export->exp_imp_reverse != NULL) {
1025                 /* destroyed import can be still referenced in ctxt */
1026                 obd_set_info_async(export, sizeof(KEY_REVIMP_UPD),
1027                                    KEY_REVIMP_UPD, 0, NULL, NULL);
1028
1029                 client_destroy_import(export->exp_imp_reverse);
1030         }
1031
1032         /* for the rest part, we return -ENOTCONN in case of errors
1033          * in order to let client initialize connection again.
1034          */
1035         revimp = export->exp_imp_reverse = class_new_import(target);
1036         if (!revimp) {
1037                 CERROR("fail to alloc new reverse import.\n");
1038                 GOTO(out, rc = -ENOTCONN);
1039         }
1040
1041         revimp->imp_connection = ptlrpc_connection_addref(export->exp_connection);
1042         revimp->imp_client = &export->exp_obd->obd_ldlm_client;
1043         revimp->imp_remote_handle = conn;
1044         revimp->imp_dlm_fake = 1;
1045         revimp->imp_state = LUSTRE_IMP_FULL;
1046
1047         /* unknown versions will be caught in
1048          * ptlrpc_handle_server_req_in->lustre_unpack_msg() */
1049         revimp->imp_msg_magic = req->rq_reqmsg->lm_magic;
1050
1051         if ((export->exp_connect_flags & OBD_CONNECT_AT) &&
1052             (revimp->imp_msg_magic != LUSTRE_MSG_MAGIC_V1))
1053                 revimp->imp_msghdr_flags |= MSGHDR_AT_SUPPORT;
1054         else
1055                 revimp->imp_msghdr_flags &= ~MSGHDR_AT_SUPPORT;
1056
1057         rc = sptlrpc_import_sec_adapt(revimp, req->rq_svc_ctx, &req->rq_flvr);
1058         if (rc) {
1059                 CERROR("Failed to get sec for reverse import: %d\n", rc);
1060                 export->exp_imp_reverse = NULL;
1061                 class_destroy_import(revimp);
1062         }
1063
1064         class_import_put(revimp);
1065 out:
1066         if (export) {
1067                 cfs_spin_lock(&export->exp_lock);
1068                 export->exp_connecting = 0;
1069                 cfs_spin_unlock(&export->exp_lock);
1070         }
1071         if (targref)
1072                 class_decref(targref, __FUNCTION__, cfs_current());
1073         if (rc)
1074                 req->rq_status = rc;
1075         RETURN(rc);
1076 }
1077
1078 int target_handle_disconnect(struct ptlrpc_request *req)
1079 {
1080         int rc;
1081         ENTRY;
1082
1083         rc = req_capsule_server_pack(&req->rq_pill);
1084         if (rc)
1085                 RETURN(rc);
1086
1087         /* keep the rq_export around so we can send the reply */
1088         req->rq_status = obd_disconnect(class_export_get(req->rq_export));
1089
1090         RETURN(0);
1091 }
1092
1093 void target_destroy_export(struct obd_export *exp)
1094 {
1095         /* exports created from last_rcvd data, and "fake"
1096            exports created by lctl don't have an import */
1097         if (exp->exp_imp_reverse != NULL)
1098                 client_destroy_import(exp->exp_imp_reverse);
1099
1100         LASSERT(cfs_atomic_read(&exp->exp_locks_count) == 0);
1101         LASSERT(cfs_atomic_read(&exp->exp_rpc_count) == 0);
1102         LASSERT(cfs_atomic_read(&exp->exp_cb_count) == 0);
1103         LASSERT(cfs_atomic_read(&exp->exp_replay_count) == 0);
1104 }
1105
1106 /*
1107  * Recovery functions
1108  */
1109 static void target_request_copy_get(struct ptlrpc_request *req)
1110 {
1111         class_export_rpc_get(req->rq_export);
1112         LASSERT(cfs_list_empty(&req->rq_list));
1113         CFS_INIT_LIST_HEAD(&req->rq_replay_list);
1114         /* increase refcount to keep request in queue */
1115         LASSERT(cfs_atomic_read(&req->rq_refcount));
1116         cfs_atomic_inc(&req->rq_refcount);
1117         /** let export know it has replays to be handled */
1118         cfs_atomic_inc(&req->rq_export->exp_replay_count);
1119         /* release service thread while request is queued 
1120          * we are moving the request from active processing
1121          * to waiting on the replay queue */
1122         ptlrpc_server_active_request_dec(req);
1123 }
1124
1125 static void target_request_copy_put(struct ptlrpc_request *req)
1126 {
1127         LASSERT(cfs_list_empty(&req->rq_replay_list));
1128         LASSERT(cfs_atomic_read(&req->rq_export->exp_replay_count) > 0);
1129         cfs_atomic_dec(&req->rq_export->exp_replay_count);
1130         class_export_rpc_put(req->rq_export);
1131         /* ptlrpc_server_drop_request() assumes the request is active */
1132         ptlrpc_server_active_request_inc(req);
1133         ptlrpc_server_drop_request(req);
1134 }
1135
1136 static int target_exp_enqueue_req_replay(struct ptlrpc_request *req)
1137 {
1138         __u64                  transno = lustre_msg_get_transno(req->rq_reqmsg);
1139         struct obd_export     *exp = req->rq_export;
1140         struct ptlrpc_request *reqiter;
1141         int                    dup = 0;
1142
1143         LASSERT(exp);
1144
1145         cfs_spin_lock(&exp->exp_lock);
1146         cfs_list_for_each_entry(reqiter, &exp->exp_req_replay_queue,
1147                                 rq_replay_list) {
1148                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) == transno) {
1149                         dup = 1;
1150                         break;
1151                 }
1152         }
1153
1154         if (dup) {
1155                 /* we expect it with RESENT and REPLAY flags */
1156                 if ((lustre_msg_get_flags(req->rq_reqmsg) &
1157                      (MSG_RESENT | MSG_REPLAY)) != (MSG_RESENT | MSG_REPLAY))
1158                         CERROR("invalid flags %x of resent replay\n",
1159                                lustre_msg_get_flags(req->rq_reqmsg));
1160         } else {
1161                 cfs_list_add_tail(&req->rq_replay_list,
1162                                   &exp->exp_req_replay_queue);
1163         }
1164
1165         cfs_spin_unlock(&exp->exp_lock);
1166         return dup;
1167 }
1168
1169 static void target_exp_dequeue_req_replay(struct ptlrpc_request *req)
1170 {
1171         LASSERT(!cfs_list_empty(&req->rq_replay_list));
1172         LASSERT(req->rq_export);
1173
1174         cfs_spin_lock(&req->rq_export->exp_lock);
1175         cfs_list_del_init(&req->rq_replay_list);
1176         cfs_spin_unlock(&req->rq_export->exp_lock);
1177 }
1178
1179 #ifdef __KERNEL__
1180 static void target_finish_recovery(struct obd_device *obd)
1181 {
1182         ENTRY;
1183         LCONSOLE_INFO("%s: sending delayed replies to recovered clients\n",
1184                       obd->obd_name);
1185
1186         ldlm_reprocess_all_ns(obd->obd_namespace);
1187         cfs_spin_lock_bh(&obd->obd_processing_task_lock);
1188         if (!cfs_list_empty(&obd->obd_req_replay_queue) ||
1189             !cfs_list_empty(&obd->obd_lock_replay_queue) ||
1190             !cfs_list_empty(&obd->obd_final_req_queue)) {
1191                 CERROR("%s: Recovery queues ( %s%s%s) are not empty\n",
1192                        obd->obd_name,
1193                        cfs_list_empty(&obd->obd_req_replay_queue) ? "" : "req ",
1194                        cfs_list_empty(&obd->obd_lock_replay_queue) ? \
1195                                "" : "lock ",
1196                        cfs_list_empty(&obd->obd_final_req_queue) ? \
1197                                "" : "final ");
1198                 cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
1199                 LBUG();
1200         }
1201         cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
1202
1203         obd->obd_recovery_end = cfs_time_current_sec();
1204
1205         /* when recovery finished, cleanup orphans on mds and ost */
1206         if (OBT(obd) && OBP(obd, postrecov)) {
1207                 int rc = OBP(obd, postrecov)(obd);
1208                 if (rc < 0)
1209                         LCONSOLE_WARN("%s: Post recovery failed, rc %d\n",
1210                                       obd->obd_name, rc);
1211         }
1212         EXIT;
1213 }
1214
1215 static void abort_req_replay_queue(struct obd_device *obd)
1216 {
1217         struct ptlrpc_request *req, *n;
1218         cfs_list_t abort_list;
1219
1220         CFS_INIT_LIST_HEAD(&abort_list);
1221         cfs_spin_lock_bh(&obd->obd_processing_task_lock);
1222         cfs_list_splice_init(&obd->obd_req_replay_queue, &abort_list);
1223         cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
1224         cfs_list_for_each_entry_safe(req, n, &abort_list, rq_list) {
1225                 DEBUG_REQ(D_WARNING, req, "aborted:");
1226                 req->rq_status = -ENOTCONN;
1227                 if (ptlrpc_error(req)) {
1228                         DEBUG_REQ(D_ERROR, req,
1229                                   "failed abort_req_reply; skipping");
1230                 }
1231                 target_exp_dequeue_req_replay(req);
1232                 target_request_copy_put(req);
1233         }
1234 }
1235
1236 static void abort_lock_replay_queue(struct obd_device *obd)
1237 {
1238         struct ptlrpc_request *req, *n;
1239         cfs_list_t abort_list;
1240
1241         CFS_INIT_LIST_HEAD(&abort_list);
1242         cfs_spin_lock_bh(&obd->obd_processing_task_lock);
1243         cfs_list_splice_init(&obd->obd_lock_replay_queue, &abort_list);
1244         cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
1245         cfs_list_for_each_entry_safe(req, n, &abort_list, rq_list){
1246                 DEBUG_REQ(D_ERROR, req, "aborted:");
1247                 req->rq_status = -ENOTCONN;
1248                 if (ptlrpc_error(req)) {
1249                         DEBUG_REQ(D_ERROR, req,
1250                                   "failed abort_lock_reply; skipping");
1251                 }
1252                 target_request_copy_put(req);
1253         }
1254 }
1255 #endif
1256
1257 /* Called from a cleanup function if the device is being cleaned up
1258    forcefully.  The exports should all have been disconnected already,
1259    the only thing left to do is
1260      - clear the recovery flags
1261      - cancel the timer
1262      - free queued requests and replies, but don't send replies
1263    Because the obd_stopping flag is set, no new requests should be received.
1264
1265 */
1266 void target_cleanup_recovery(struct obd_device *obd)
1267 {
1268         struct ptlrpc_request *req, *n;
1269         cfs_list_t clean_list;
1270         ENTRY;
1271
1272         CFS_INIT_LIST_HEAD(&clean_list);
1273         cfs_spin_lock_bh(&obd->obd_processing_task_lock);
1274         if (!obd->obd_recovering) {
1275                 cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
1276                 EXIT;
1277                 return;
1278         }
1279         obd->obd_recovering = obd->obd_abort_recovery = 0;
1280         target_cancel_recovery_timer(obd);
1281
1282         cfs_list_splice_init(&obd->obd_req_replay_queue, &clean_list);
1283         cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
1284
1285         cfs_list_for_each_entry_safe(req, n, &clean_list, rq_list) {
1286                 LASSERT(req->rq_reply_state == 0);
1287                 target_exp_dequeue_req_replay(req);
1288                 target_request_copy_put(req);
1289         }
1290
1291         cfs_spin_lock_bh(&obd->obd_processing_task_lock);
1292         cfs_list_splice_init(&obd->obd_lock_replay_queue, &clean_list);
1293         cfs_list_splice_init(&obd->obd_final_req_queue, &clean_list);
1294         cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
1295
1296         cfs_list_for_each_entry_safe(req, n, &clean_list, rq_list){
1297                 LASSERT(req->rq_reply_state == 0);
1298                 target_request_copy_put(req);
1299         }
1300
1301         EXIT;
1302 }
1303
1304 /* obd_processing_task_lock should be held */
1305 void target_cancel_recovery_timer(struct obd_device *obd)
1306 {
1307         CDEBUG(D_HA, "%s: cancel recovery timer\n", obd->obd_name);
1308         cfs_timer_disarm(&obd->obd_recovery_timer);
1309 }
1310
1311 /* extend = 1 means require at least "duration" seconds left in the timer,
1312    extend = 0 means set the total duration (start_recovery_timer) */
1313 static void reset_recovery_timer(struct obd_device *obd, int duration,
1314                                  int extend)
1315 {
1316         cfs_time_t now = cfs_time_current_sec();
1317         cfs_duration_t left;
1318
1319         cfs_spin_lock_bh(&obd->obd_processing_task_lock);
1320         if (!obd->obd_recovering || obd->obd_abort_recovery) {
1321                 cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
1322                 return;
1323         }
1324
1325         left = cfs_time_sub(obd->obd_recovery_end, now);
1326
1327         if (extend && (duration > left))
1328                 obd->obd_recovery_timeout += duration - left;
1329         else if (!extend && (duration > obd->obd_recovery_timeout))
1330                 /* Track the client's largest expected replay time */
1331                 obd->obd_recovery_timeout = duration;
1332 #ifdef CRAY_XT3
1333         /*
1334          * If total recovery time already exceed the
1335          * obd_recovery_max_time, then CRAY XT3 will
1336          * abort the recovery
1337          */
1338         if(obd->obd_recovery_timeout > obd->obd_recovery_max_time)
1339                 obd->obd_recovery_timeout = obd->obd_recovery_max_time;
1340 #endif
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_bh(&obd->obd_processing_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_bh(&obd->obd_processing_task_lock);
1356         if (cfs_timer_is_armed(&obd->obd_recovery_timer)) {
1357                 cfs_spin_unlock_bh(&obd->obd_processing_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         /* minimum */
1363         obd->obd_recovery_timeout = OBD_RECOVERY_FACTOR * obd_timeout;
1364         cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
1365
1366         reset_recovery_timer(obd, obd->obd_recovery_timeout, 0);
1367 }
1368
1369 /* Reset the timer with each new client connection */
1370 /*
1371  * This timer is actually reconnect_timer, which is for making sure
1372  * the total recovery window is at least as big as my reconnect
1373  * attempt timing. So the initial recovery time_out will be set to
1374  * OBD_RECOVERY_FACTOR * obd_timeout. If the timeout coming
1375  * from client is bigger than this, then the recovery time_out will
1376  * be extended to make sure the client could be reconnected, in the
1377  * process, the timeout from the new client should be ignored.
1378  */
1379
1380 static void
1381 target_start_and_reset_recovery_timer(struct obd_device *obd,
1382                                       struct ptlrpc_request *req,
1383                                       int new_client)
1384 {
1385         int service_time = lustre_msg_get_service_time(req->rq_reqmsg);
1386
1387         if (!new_client && service_time)
1388                 /* Teach server about old server's estimates, as first guess
1389                  * at how long new requests will take. */
1390                 at_add(&req->rq_rqbd->rqbd_service->srv_at_estimate,
1391                        service_time);
1392
1393         check_and_start_recovery_timer(obd);
1394
1395         /* convert the service time to rpc timeout,
1396          * reuse service_time to limit stack usage */
1397         service_time = at_est2timeout(service_time);
1398
1399         /* We expect other clients to timeout within service_time, then try
1400          * to reconnect, then try the failover server.  The max delay between
1401          * connect attempts is SWITCH_MAX + SWITCH_INC + INITIAL */
1402         service_time += 2 * (CONNECTION_SWITCH_MAX + CONNECTION_SWITCH_INC +
1403                              INITIAL_CONNECT_TIMEOUT);
1404         if (service_time > obd->obd_recovery_timeout && !new_client)
1405                 reset_recovery_timer(obd, service_time, 0);
1406 }
1407
1408 #ifdef __KERNEL__
1409
1410 /** Health checking routines */
1411 static inline int exp_connect_healthy(struct obd_export *exp)
1412 {
1413         return (exp->exp_in_recovery);
1414 }
1415
1416 /** if export done req_replay or has replay in queue */
1417 static inline int exp_req_replay_healthy(struct obd_export *exp)
1418 {
1419         return (!exp->exp_req_replay_needed ||
1420                 cfs_atomic_read(&exp->exp_replay_count) > 0);
1421 }
1422 /** if export done lock_replay or has replay in queue */
1423 static inline int exp_lock_replay_healthy(struct obd_export *exp)
1424 {
1425         return (!exp->exp_lock_replay_needed ||
1426                 cfs_atomic_read(&exp->exp_replay_count) > 0);
1427 }
1428
1429 static inline int exp_vbr_healthy(struct obd_export *exp)
1430 {
1431         return (!exp->exp_vbr_failed);
1432 }
1433
1434 static inline int exp_finished(struct obd_export *exp)
1435 {
1436         return (exp->exp_in_recovery && !exp->exp_lock_replay_needed);
1437 }
1438
1439 /** Checking routines for recovery */
1440 static int check_for_clients(struct obd_device *obd)
1441 {
1442         if (obd->obd_abort_recovery || obd->obd_recovery_expired)
1443                 return 1;
1444         LASSERT(obd->obd_connected_clients <= obd->obd_max_recoverable_clients);
1445         if (obd->obd_no_conn == 0 &&
1446             obd->obd_connected_clients + obd->obd_stale_clients ==
1447             obd->obd_max_recoverable_clients)
1448                 return 1;
1449         return 0;
1450 }
1451
1452 static int check_for_next_transno(struct obd_device *obd)
1453 {
1454         struct ptlrpc_request *req = NULL;
1455         int wake_up = 0, connected, completed, queue_len;
1456         __u64 next_transno, req_transno;
1457         ENTRY;
1458         cfs_spin_lock_bh(&obd->obd_processing_task_lock);
1459
1460         if (!cfs_list_empty(&obd->obd_req_replay_queue)) {
1461                 req = cfs_list_entry(obd->obd_req_replay_queue.next,
1462                                      struct ptlrpc_request, rq_list);
1463                 req_transno = lustre_msg_get_transno(req->rq_reqmsg);
1464         } else {
1465                 req_transno = 0;
1466         }
1467
1468         connected = obd->obd_connected_clients;
1469         completed = connected - cfs_atomic_read(&obd->obd_req_replay_clients);
1470         queue_len = obd->obd_requests_queued_for_recovery;
1471         next_transno = obd->obd_next_recovery_transno;
1472
1473         CDEBUG(D_HA, "max: %d, connected: %d, completed: %d, queue_len: %d, "
1474                "req_transno: "LPU64", next_transno: "LPU64"\n",
1475                obd->obd_max_recoverable_clients, connected, completed,
1476                queue_len, req_transno, next_transno);
1477
1478         if (obd->obd_abort_recovery) {
1479                 CDEBUG(D_HA, "waking for aborted recovery\n");
1480                 wake_up = 1;
1481         } else if (obd->obd_recovery_expired) {
1482                 CDEBUG(D_HA, "waking for expired recovery\n");
1483                 wake_up = 1;
1484         } else if (cfs_atomic_read(&obd->obd_req_replay_clients) == 0) {
1485                 CDEBUG(D_HA, "waking for completed recovery\n");
1486                 wake_up = 1;
1487         } else if (req_transno == next_transno) {
1488                 CDEBUG(D_HA, "waking for next ("LPD64")\n", next_transno);
1489                 wake_up = 1;
1490         } else if (queue_len == cfs_atomic_read(&obd->obd_req_replay_clients)) {
1491                 int d_lvl = D_HA;
1492                 /** handle gaps occured due to lost reply or VBR */
1493                 LASSERTF(req_transno >= next_transno,
1494                          "req_transno: "LPU64", next_transno: "LPU64"\n",
1495                          req_transno, next_transno);
1496                 if (req_transno > obd->obd_last_committed &&
1497                     !obd->obd_version_recov)
1498                         d_lvl = D_ERROR;
1499                 CDEBUG(d_lvl,
1500                        "%s: waking for gap in transno, VBR is %s (skip: "
1501                        LPD64", ql: %d, comp: %d, conn: %d, next: "LPD64
1502                        ", last_committed: "LPD64")\n",
1503                        obd->obd_name, obd->obd_version_recov ? "ON" : "OFF",
1504                        next_transno, queue_len, completed, connected,
1505                        req_transno, obd->obd_last_committed);
1506                 obd->obd_next_recovery_transno = req_transno;
1507                 wake_up = 1;
1508         } else if (OBD_FAIL_CHECK(OBD_FAIL_MDS_RECOVERY_ACCEPTS_GAPS)) {
1509                 CDEBUG(D_HA, "accepting transno gaps is explicitly allowed"
1510                        " by fail_lock, waking up ("LPD64")\n", next_transno);
1511                 obd->obd_next_recovery_transno = req_transno;
1512                 wake_up = 1;
1513         }
1514         cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
1515         return wake_up;
1516 }
1517
1518 static int check_for_next_lock(struct obd_device *obd)
1519 {
1520         int wake_up = 0;
1521
1522         cfs_spin_lock_bh(&obd->obd_processing_task_lock);
1523         if (!cfs_list_empty(&obd->obd_lock_replay_queue)) {
1524                 CDEBUG(D_HA, "waking for next lock\n");
1525                 wake_up = 1;
1526         } else if (cfs_atomic_read(&obd->obd_lock_replay_clients) == 0) {
1527                 CDEBUG(D_HA, "waking for completed lock replay\n");
1528                 wake_up = 1;
1529         } else if (obd->obd_abort_recovery) {
1530                 CDEBUG(D_HA, "waking for aborted recovery\n");
1531                 wake_up = 1;
1532         } else if (obd->obd_recovery_expired) {
1533                 CDEBUG(D_HA, "waking for expired recovery\n");
1534                 wake_up = 1;
1535         }
1536         cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
1537
1538         return wake_up;
1539 }
1540
1541 /**
1542  * wait for recovery events,
1543  * check its status with help of check_routine
1544  * evict dead clients via health_check
1545  */
1546 static int target_recovery_overseer(struct obd_device *obd,
1547                                     int (*check_routine)(struct obd_device *),
1548                                     int (*health_check)(struct obd_export *))
1549 {
1550         int abort = 0, expired = 1;
1551
1552         do {
1553                 cfs_wait_event(obd->obd_next_transno_waitq, check_routine(obd));
1554                 cfs_spin_lock_bh(&obd->obd_processing_task_lock);
1555                 abort = obd->obd_abort_recovery;
1556                 expired = obd->obd_recovery_expired;
1557                 obd->obd_recovery_expired = 0;
1558                 cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
1559                 if (abort) {
1560                         CWARN("recovery is aborted, evict exports in recovery\n");
1561                         /** evict exports which didn't finish recovery yet */
1562                         class_disconnect_stale_exports(obd, exp_finished);
1563                 } else if (expired) {
1564                         /** If some clients died being recovered, evict them */
1565                         CDEBUG(D_WARNING, "recovery is timed out, evict stale exports\n");
1566                         /** evict cexports with no replay in queue, they are stalled */
1567                         class_disconnect_stale_exports(obd, health_check);
1568                         /** continue with VBR */
1569                         cfs_spin_lock_bh(&obd->obd_processing_task_lock);
1570                         obd->obd_version_recov = 1;
1571                         cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
1572                         /**
1573                          * reset timer, recovery will proceed with versions now,
1574                          * timeout is set just to handle reconnection delays
1575                          */
1576                         reset_recovery_timer(obd, RECONNECT_DELAY_MAX, 1);
1577                         /** Wait for recovery events again, after evicting bad clients */
1578                 }
1579         } while (!abort && expired);
1580
1581         return abort;
1582 }
1583
1584 static struct ptlrpc_request *target_next_replay_req(struct obd_device *obd)
1585 {
1586         struct ptlrpc_request *req = NULL;
1587         ENTRY;
1588
1589         CDEBUG(D_HA, "Waiting for transno "LPD64"\n",
1590                obd->obd_next_recovery_transno);
1591
1592         if (target_recovery_overseer(obd, check_for_next_transno,
1593                                      exp_req_replay_healthy)) {
1594                 abort_req_replay_queue(obd);
1595                 abort_lock_replay_queue(obd);
1596         }
1597
1598         cfs_spin_lock_bh(&obd->obd_processing_task_lock);
1599         if (!cfs_list_empty(&obd->obd_req_replay_queue)) {
1600                 req = cfs_list_entry(obd->obd_req_replay_queue.next,
1601                                      struct ptlrpc_request, rq_list);
1602                 cfs_list_del_init(&req->rq_list);
1603                 obd->obd_requests_queued_for_recovery--;
1604                 cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
1605         } else {
1606                 cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
1607                 LASSERT(cfs_list_empty(&obd->obd_req_replay_queue));
1608                 LASSERT(cfs_atomic_read(&obd->obd_req_replay_clients) == 0);
1609                 /** evict exports failed VBR */
1610                 class_disconnect_stale_exports(obd, exp_vbr_healthy);
1611         }
1612         RETURN(req);
1613 }
1614
1615 static struct ptlrpc_request *target_next_replay_lock(struct obd_device *obd)
1616 {
1617         struct ptlrpc_request *req = NULL;
1618
1619         CDEBUG(D_HA, "Waiting for lock\n");
1620         if (target_recovery_overseer(obd, check_for_next_lock,
1621                                      exp_lock_replay_healthy))
1622                 abort_lock_replay_queue(obd);
1623
1624         cfs_spin_lock_bh(&obd->obd_processing_task_lock);
1625         if (!cfs_list_empty(&obd->obd_lock_replay_queue)) {
1626                 req = cfs_list_entry(obd->obd_lock_replay_queue.next,
1627                                      struct ptlrpc_request, rq_list);
1628                 cfs_list_del_init(&req->rq_list);
1629                 cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
1630         } else {
1631                 cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
1632                 LASSERT(cfs_list_empty(&obd->obd_lock_replay_queue));
1633                 LASSERT(cfs_atomic_read(&obd->obd_lock_replay_clients) == 0);
1634                 /** evict exports failed VBR */
1635                 class_disconnect_stale_exports(obd, exp_vbr_healthy);
1636         }
1637         return req;
1638 }
1639
1640 static struct ptlrpc_request *target_next_final_ping(struct obd_device *obd)
1641 {
1642         struct ptlrpc_request *req = NULL;
1643
1644         cfs_spin_lock_bh(&obd->obd_processing_task_lock);
1645         if (!cfs_list_empty(&obd->obd_final_req_queue)) {
1646                 req = cfs_list_entry(obd->obd_final_req_queue.next,
1647                                      struct ptlrpc_request, rq_list);
1648                 cfs_list_del_init(&req->rq_list);
1649                 if (req->rq_export->exp_in_recovery) {
1650                         cfs_spin_lock(&req->rq_export->exp_lock);
1651                         req->rq_export->exp_in_recovery = 0;
1652                         cfs_spin_unlock(&req->rq_export->exp_lock);
1653                 }
1654         }
1655         cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
1656         return req;
1657 }
1658
1659 static int handle_recovery_req(struct ptlrpc_thread *thread,
1660                                struct ptlrpc_request *req,
1661                                svc_handler_t handler)
1662 {
1663         int rc;
1664         ENTRY;
1665
1666         rc = lu_context_init(&req->rq_recov_session, LCT_SESSION);
1667         if (rc) {
1668                 CERROR("Failure to initialize session: %d\n", rc);
1669                 GOTO(reqcopy_put, rc);
1670         }
1671         /**
1672          * export can be evicted during recovery, no need to handle replays for
1673          * it after that, discard such request silently
1674          */
1675         if (req->rq_export->exp_disconnected)
1676                 GOTO(reqcopy_put, rc);
1677
1678         req->rq_recov_session.lc_thread = thread;
1679         lu_context_enter(&req->rq_recov_session);
1680         req->rq_svc_thread = thread;
1681         req->rq_svc_thread->t_env->le_ses = &req->rq_recov_session;
1682
1683         /* thread context */
1684         lu_context_enter(&thread->t_env->le_ctx);
1685         (void)handler(req);
1686         lu_context_exit(&thread->t_env->le_ctx);
1687
1688         lu_context_exit(&req->rq_recov_session);
1689         lu_context_fini(&req->rq_recov_session);
1690         /* don't reset timer for final stage */
1691         if (!exp_finished(req->rq_export)) {
1692                 /**
1693                  * Add request timeout to the recovery time so next request from
1694                  * this client may come in recovery time
1695                  */
1696                  reset_recovery_timer(class_exp2obd(req->rq_export),
1697                                       AT_OFF ? obd_timeout :
1698                                       lustre_msg_get_timeout(req->rq_reqmsg), 1);
1699         }
1700 reqcopy_put:
1701         RETURN(rc);
1702 }
1703
1704 static int target_recovery_thread(void *arg)
1705 {
1706         struct lu_target *lut = arg;
1707         struct obd_device *obd = lut->lut_obd;
1708         struct ptlrpc_request *req;
1709         struct target_recovery_data *trd = &obd->obd_recovery_data;
1710         unsigned long delta;
1711         unsigned long flags;
1712         struct lu_env env;
1713         struct ptlrpc_thread fake_svc_thread, *thread = &fake_svc_thread;
1714         int rc = 0;
1715         ENTRY;
1716
1717         cfs_daemonize("tgt_recov");
1718
1719         SIGNAL_MASK_LOCK(current, flags);
1720         sigfillset(&current->blocked);
1721         RECALC_SIGPENDING;
1722         SIGNAL_MASK_UNLOCK(current, flags);
1723
1724         rc = lu_context_init(&env.le_ctx, LCT_MD_THREAD);
1725         if (rc)
1726                 RETURN(rc);
1727
1728         thread->t_env = &env;
1729         env.le_ctx.lc_thread = thread;
1730
1731         CERROR("%s: started recovery thread pid %d\n", obd->obd_name,
1732                cfs_curproc_pid());
1733         trd->trd_processing_task = cfs_curproc_pid();
1734
1735         obd->obd_recovering = 1;
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         obd->obd_req_replaying = 1;
1748         CDEBUG(D_INFO, "1: request replay stage - %d clients from t"LPU64"\n",
1749                cfs_atomic_read(&obd->obd_req_replay_clients),
1750                obd->obd_next_recovery_transno);
1751         while ((req = target_next_replay_req(obd))) {
1752                 LASSERT(trd->trd_processing_task == cfs_curproc_pid());
1753                 DEBUG_REQ(D_HA, req, "processing t"LPD64" from %s",
1754                           lustre_msg_get_transno(req->rq_reqmsg),
1755                           libcfs_nid2str(req->rq_peer.nid));
1756                 handle_recovery_req(thread, req,
1757                                     trd->trd_recovery_handler);
1758                 /**
1759                  * bz18031: increase next_recovery_transno before
1760                  * target_request_copy_put() will drop exp_rpc reference
1761                  */
1762                 cfs_spin_lock_bh(&obd->obd_processing_task_lock);
1763                 obd->obd_next_recovery_transno++;
1764                 cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
1765                 target_exp_dequeue_req_replay(req);
1766                 target_request_copy_put(req);
1767                 obd->obd_replayed_requests++;
1768         }
1769
1770         /**
1771          * The second stage: replay locks
1772          */
1773         CDEBUG(D_INFO, "2: lock replay stage - %d clients\n",
1774                cfs_atomic_read(&obd->obd_lock_replay_clients));
1775         while ((req = target_next_replay_lock(obd))) {
1776                 LASSERT(trd->trd_processing_task == cfs_curproc_pid());
1777                 DEBUG_REQ(D_HA, req, "processing lock from %s: ",
1778                           libcfs_nid2str(req->rq_peer.nid));
1779                 handle_recovery_req(thread, req,
1780                                     trd->trd_recovery_handler);
1781                 target_request_copy_put(req);
1782                 obd->obd_replayed_locks++;
1783         }
1784
1785         /**
1786          * The third stage: reply on final pings, at this moment all clients
1787          * must have request in final queue
1788          */
1789         CDEBUG(D_INFO, "3: final stage - process recovery completion pings\n");
1790         /** Update server last boot epoch */
1791         lut_boot_epoch_update(lut);
1792         /* We drop recoverying flag to forward all new requests
1793          * to regular mds_handle() since now */
1794         cfs_spin_lock_bh(&obd->obd_processing_task_lock);
1795         obd->obd_recovering = obd->obd_abort_recovery = 0;
1796         target_cancel_recovery_timer(obd);
1797         cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
1798         while ((req = target_next_final_ping(obd))) {
1799                 LASSERT(trd->trd_processing_task == cfs_curproc_pid());
1800                 DEBUG_REQ(D_HA, req, "processing final ping from %s: ",
1801                           libcfs_nid2str(req->rq_peer.nid));
1802                 handle_recovery_req(thread, req,
1803                                     trd->trd_recovery_handler);
1804                 target_request_copy_put(req);
1805         }
1806
1807         delta = (jiffies - delta) / CFS_HZ;
1808         CDEBUG(D_INFO,"4: recovery completed in %lus - %d/%d reqs/locks\n",
1809               delta, obd->obd_replayed_requests, obd->obd_replayed_locks);
1810         if (delta > obd_timeout * OBD_RECOVERY_FACTOR) {
1811                 CWARN("too long recovery - read logs\n");
1812                 libcfs_debug_dumplog();
1813         }
1814
1815         target_finish_recovery(obd);
1816
1817         lu_context_fini(&env.le_ctx);
1818         trd->trd_processing_task = 0;
1819         cfs_complete(&trd->trd_finishing);
1820         RETURN(rc);
1821 }
1822
1823 static int target_start_recovery_thread(struct lu_target *lut,
1824                                         svc_handler_t handler)
1825 {
1826         struct obd_device *obd = lut->lut_obd;
1827         int rc = 0;
1828         struct target_recovery_data *trd = &obd->obd_recovery_data;
1829
1830         memset(trd, 0, sizeof(*trd));
1831         cfs_init_completion(&trd->trd_starting);
1832         cfs_init_completion(&trd->trd_finishing);
1833         trd->trd_recovery_handler = handler;
1834
1835         if (cfs_kernel_thread(target_recovery_thread, lut, 0) > 0) {
1836                 cfs_wait_for_completion(&trd->trd_starting);
1837                 LASSERT(obd->obd_recovering != 0);
1838         } else
1839                 rc = -ECHILD;
1840
1841         return rc;
1842 }
1843
1844 void target_stop_recovery_thread(struct obd_device *obd)
1845 {
1846         cfs_spin_lock_bh(&obd->obd_processing_task_lock);
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                 if (obd->obd_recovering) {
1851                         CERROR("%s: Aborting recovery\n", obd->obd_name);
1852                         obd->obd_abort_recovery = 1;
1853                         cfs_waitq_signal(&obd->obd_next_transno_waitq);
1854                 }
1855                 cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
1856                 cfs_wait_for_completion(&trd->trd_finishing);
1857         } else {
1858                 cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
1859         }
1860 }
1861
1862 void target_recovery_fini(struct obd_device *obd)
1863 {
1864         class_disconnect_exports(obd);
1865         target_stop_recovery_thread(obd);
1866         target_cleanup_recovery(obd);
1867 }
1868 EXPORT_SYMBOL(target_recovery_fini);
1869
1870 static void target_recovery_expired(unsigned long castmeharder)
1871 {
1872         struct obd_device *obd = (struct obd_device *)castmeharder;
1873         CDEBUG(D_HA, "%s: recovery timed out; %d clients are still in recovery"
1874                " after %lds (%d clients connected)\n",
1875                obd->obd_name, cfs_atomic_read(&obd->obd_lock_replay_clients),
1876                cfs_time_current_sec()- obd->obd_recovery_start,
1877                obd->obd_connected_clients);
1878
1879         cfs_spin_lock_bh(&obd->obd_processing_task_lock);
1880         obd->obd_recovery_expired = 1;
1881         cfs_waitq_signal(&obd->obd_next_transno_waitq);
1882         cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
1883 }
1884
1885 void target_recovery_init(struct lu_target *lut, svc_handler_t handler)
1886 {
1887         struct obd_device *obd = lut->lut_obd;
1888         if (obd->obd_max_recoverable_clients == 0) {
1889                 /** Update server last boot epoch */
1890                 lut_boot_epoch_update(lut);
1891                 return;
1892         }
1893
1894         CWARN("RECOVERY: service %s, %d recoverable clients, "
1895               "last_transno "LPU64"\n", obd->obd_name,
1896               obd->obd_max_recoverable_clients, obd->obd_last_committed);
1897         LASSERT(obd->obd_stopping == 0);
1898         obd->obd_next_recovery_transno = obd->obd_last_committed + 1;
1899         obd->obd_recovery_start = 0;
1900         obd->obd_recovery_end = 0;
1901         obd->obd_recovery_timeout = OBD_RECOVERY_FACTOR * obd_timeout;
1902         /* bz13079: this should be set to desired value for ost but not for mds */
1903         obd->obd_recovery_max_time = OBD_RECOVERY_MAX_TIME;
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                 cfs_spin_lock_bh(&obd->obd_processing_task_lock);
1919                 if (exp->exp_req_replay_needed) {
1920                         LASSERT(cfs_atomic_read(&obd->obd_req_replay_clients) >
1921                                 0);
1922                         cfs_spin_lock(&exp->exp_lock);
1923                         exp->exp_req_replay_needed = 0;
1924                         cfs_spin_unlock(&exp->exp_lock);
1925                         cfs_atomic_dec(&obd->obd_req_replay_clients);
1926                 }
1927                 cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
1928         }
1929         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
1930                 /* client declares he's ready to complete recovery
1931                  * so, we put the request on th final queue */
1932                 cfs_spin_lock_bh(&obd->obd_processing_task_lock);
1933                 if (exp->exp_lock_replay_needed) {
1934                         LASSERT(cfs_atomic_read(&obd->obd_lock_replay_clients) >
1935                                 0);
1936                         cfs_spin_lock(&exp->exp_lock);
1937                         exp->exp_lock_replay_needed = 0;
1938                         cfs_spin_unlock(&exp->exp_lock);
1939                         cfs_atomic_dec(&obd->obd_lock_replay_clients);
1940                 }
1941                 cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
1942         }
1943
1944         return 0;
1945 }
1946
1947 int target_queue_recovery_request(struct ptlrpc_request *req,
1948                                   struct obd_device *obd)
1949 {
1950         cfs_list_t *tmp;
1951         int inserted = 0;
1952         __u64 transno = lustre_msg_get_transno(req->rq_reqmsg);
1953         ENTRY;
1954
1955         if (obd->obd_recovery_data.trd_processing_task == cfs_curproc_pid()) {
1956                 /* Processing the queue right now, don't re-add. */
1957                 RETURN(1);
1958         }
1959
1960         target_process_req_flags(obd, req);
1961
1962         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
1963                 /* client declares he's ready to complete recovery
1964                  * so, we put the request on th final queue */
1965                 target_request_copy_get(req);
1966                 DEBUG_REQ(D_HA, req, "queue final req");
1967                 cfs_spin_lock_bh(&obd->obd_processing_task_lock);
1968                 cfs_waitq_signal(&obd->obd_next_transno_waitq);
1969                 if (obd->obd_recovering) {
1970                         cfs_list_add_tail(&req->rq_list,
1971                                           &obd->obd_final_req_queue);
1972                 } else {
1973                         cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
1974                         target_request_copy_put(req);
1975                         RETURN(obd->obd_stopping ? -ENOTCONN : 1);
1976                 }
1977                 cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
1978                 RETURN(0);
1979         }
1980         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
1981                 /* client declares he's ready to replay locks */
1982                 target_request_copy_get(req);
1983                 DEBUG_REQ(D_HA, req, "queue lock replay req");
1984                 cfs_spin_lock_bh(&obd->obd_processing_task_lock);
1985                 cfs_waitq_signal(&obd->obd_next_transno_waitq);
1986                 LASSERT(obd->obd_recovering);
1987                 /* usually due to recovery abort */
1988                 if (!req->rq_export->exp_in_recovery) {
1989                         cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
1990                         target_request_copy_put(req);
1991                         RETURN(-ENOTCONN);
1992                 }
1993                 LASSERT(req->rq_export->exp_lock_replay_needed);
1994                 cfs_list_add_tail(&req->rq_list, &obd->obd_lock_replay_queue);
1995                 cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
1996                 RETURN(0);
1997         }
1998
1999         /* CAVEAT EMPTOR: The incoming request message has been swabbed
2000          * (i.e. buflens etc are in my own byte order), but type-dependent
2001          * buffers (eg mds_body, ost_body etc) have NOT been swabbed. */
2002
2003         if (!transno) {
2004                 CFS_INIT_LIST_HEAD(&req->rq_list);
2005                 DEBUG_REQ(D_HA, req, "not queueing");
2006                 RETURN(1);
2007         }
2008
2009         cfs_spin_lock_bh(&obd->obd_processing_task_lock);
2010
2011         /* If we're processing the queue, we want don't want to queue this
2012          * message.
2013          *
2014          * Also, if this request has a transno less than the one we're waiting
2015          * for, we should process it now.  It could (and currently always will)
2016          * be an open request for a descriptor that was opened some time ago.
2017          *
2018          * Also, a resent, replayed request that has already been
2019          * handled will pass through here and be processed immediately.
2020          */
2021         CWARN("Next recovery transno: "LPU64", current: "LPU64", replaying: %i\n",
2022               obd->obd_next_recovery_transno, transno, obd->obd_req_replaying);
2023         if (transno < obd->obd_next_recovery_transno && obd->obd_req_replaying) {
2024                 /* Processing the queue right now, don't re-add. */
2025                 LASSERT(cfs_list_empty(&req->rq_list));
2026                 cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
2027                 RETURN(1);
2028         }
2029         cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
2030
2031         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_REPLAY_DROP))
2032                 RETURN(0);
2033
2034         target_request_copy_get(req);
2035         cfs_spin_lock_bh(&obd->obd_processing_task_lock);
2036         LASSERT(obd->obd_recovering);
2037         if (!req->rq_export->exp_in_recovery) {
2038                 cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
2039                 target_request_copy_put(req);
2040                 RETURN(-ENOTCONN);
2041         }
2042         LASSERT(req->rq_export->exp_req_replay_needed);
2043
2044         if (target_exp_enqueue_req_replay(req)) {
2045                 cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
2046                 DEBUG_REQ(D_ERROR, req, "dropping resent queued req");
2047                 target_request_copy_put(req);
2048                 RETURN(0);
2049         }
2050
2051         /* XXX O(n^2) */
2052         cfs_list_for_each(tmp, &obd->obd_req_replay_queue) {
2053                 struct ptlrpc_request *reqiter =
2054                         cfs_list_entry(tmp, struct ptlrpc_request, rq_list);
2055
2056                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) > transno) {
2057                         cfs_list_add_tail(&req->rq_list, &reqiter->rq_list);
2058                         inserted = 1;
2059                         break;
2060                 }
2061
2062                 if (unlikely(lustre_msg_get_transno(reqiter->rq_reqmsg) ==
2063                              transno)) {
2064                         DEBUG_REQ(D_ERROR, req, "dropping replay: transno "
2065                                   "has been claimed by another client");
2066                         cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
2067                         target_exp_dequeue_req_replay(req);
2068                         target_request_copy_put(req);
2069                         RETURN(0);
2070                 }
2071         }
2072
2073         if (!inserted)
2074                 cfs_list_add_tail(&req->rq_list, &obd->obd_req_replay_queue);
2075
2076         obd->obd_requests_queued_for_recovery++;
2077         cfs_waitq_signal(&obd->obd_next_transno_waitq);
2078         cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
2079         RETURN(0);
2080 }
2081
2082 /**
2083  * Packs current SLV and Limit into \a req.
2084  */
2085 int target_pack_pool_reply(struct ptlrpc_request *req)
2086 {
2087         struct obd_device *obd;
2088         ENTRY;
2089
2090         /*
2091          * Check that we still have all structures alive as this may
2092          * be some late rpc in shutdown time.
2093          */
2094         if (unlikely(!req->rq_export || !req->rq_export->exp_obd ||
2095                      !exp_connect_lru_resize(req->rq_export))) {
2096                 lustre_msg_set_slv(req->rq_repmsg, 0);
2097                 lustre_msg_set_limit(req->rq_repmsg, 0);
2098                 RETURN(0);
2099         }
2100
2101         /*
2102          * OBD is alive here as export is alive, which we checked above.
2103          */
2104         obd = req->rq_export->exp_obd;
2105
2106         cfs_read_lock(&obd->obd_pool_lock);
2107         lustre_msg_set_slv(req->rq_repmsg, obd->obd_pool_slv);
2108         lustre_msg_set_limit(req->rq_repmsg, obd->obd_pool_limit);
2109         cfs_read_unlock(&obd->obd_pool_lock);
2110
2111         RETURN(0);
2112 }
2113
2114 int target_send_reply_msg(struct ptlrpc_request *req, int rc, int fail_id)
2115 {
2116         if (OBD_FAIL_CHECK_ORSET(fail_id & ~OBD_FAIL_ONCE, OBD_FAIL_ONCE)) {
2117                 DEBUG_REQ(D_ERROR, req, "dropping reply");
2118                 return (-ECOMM);
2119         }
2120
2121         if (unlikely(rc)) {
2122                 DEBUG_REQ(D_ERROR, req, "processing error (%d)", rc);
2123                 req->rq_status = rc;
2124                 return (ptlrpc_send_error(req, 1));
2125         } else {
2126                 DEBUG_REQ(D_NET, req, "sending reply");
2127         }
2128
2129         return (ptlrpc_send_reply(req, PTLRPC_REPLY_MAYBE_DIFFICULT));
2130 }
2131
2132 void target_send_reply(struct ptlrpc_request *req, int rc, int fail_id)
2133 {
2134         int                        netrc;
2135         struct ptlrpc_reply_state *rs;
2136         struct obd_device         *obd;
2137         struct obd_export         *exp;
2138         struct ptlrpc_service     *svc;
2139         ENTRY;
2140
2141         if (req->rq_no_reply) {
2142                 EXIT;
2143                 return;
2144         }
2145
2146         svc = req->rq_rqbd->rqbd_service;
2147         rs = req->rq_reply_state;
2148         if (rs == NULL || !rs->rs_difficult) {
2149                 /* no notifiers */
2150                 target_send_reply_msg (req, rc, fail_id);
2151                 EXIT;
2152                 return;
2153         }
2154
2155         /* must be an export if locks saved */
2156         LASSERT (req->rq_export != NULL);
2157         /* req/reply consistent */
2158         LASSERT (rs->rs_service == svc);
2159
2160         /* "fresh" reply */
2161         LASSERT (!rs->rs_scheduled);
2162         LASSERT (!rs->rs_scheduled_ever);
2163         LASSERT (!rs->rs_handled);
2164         LASSERT (!rs->rs_on_net);
2165         LASSERT (rs->rs_export == NULL);
2166         LASSERT (cfs_list_empty(&rs->rs_obd_list));
2167         LASSERT (cfs_list_empty(&rs->rs_exp_list));
2168
2169         exp = class_export_get (req->rq_export);
2170         obd = exp->exp_obd;
2171
2172         /* disable reply scheduling while I'm setting up */
2173         rs->rs_scheduled = 1;
2174         rs->rs_on_net    = 1;
2175         rs->rs_xid       = req->rq_xid;
2176         rs->rs_transno   = req->rq_transno;
2177         rs->rs_export    = exp;
2178         rs->rs_opc       = lustre_msg_get_opc(rs->rs_msg);
2179
2180         cfs_spin_lock(&exp->exp_uncommitted_replies_lock);
2181         CDEBUG(D_NET, "rs transno = "LPU64", last committed = "LPU64"\n",
2182                rs->rs_transno, exp->exp_last_committed);
2183         if (rs->rs_transno > exp->exp_last_committed) {
2184                 /* not committed already */
2185                 cfs_list_add_tail(&rs->rs_obd_list,
2186                                   &exp->exp_uncommitted_replies);
2187         }
2188         cfs_spin_unlock (&exp->exp_uncommitted_replies_lock);
2189
2190         cfs_spin_lock(&exp->exp_lock);
2191         cfs_list_add_tail(&rs->rs_exp_list, &exp->exp_outstanding_replies);
2192         cfs_spin_unlock(&exp->exp_lock);
2193
2194         netrc = target_send_reply_msg (req, rc, fail_id);
2195
2196         cfs_spin_lock(&svc->srv_lock);
2197
2198         cfs_atomic_inc(&svc->srv_n_difficult_replies);
2199
2200         if (netrc != 0) {
2201                 /* error sending: reply is off the net.  Also we need +1
2202                  * reply ref until ptlrpc_handle_rs() is done
2203                  * with the reply state (if the send was successful, there
2204                  * would have been +1 ref for the net, which
2205                  * reply_out_callback leaves alone) */
2206                 rs->rs_on_net = 0;
2207                 ptlrpc_rs_addref(rs);
2208                 cfs_atomic_inc (&svc->srv_outstanding_replies);
2209         }
2210
2211         cfs_spin_lock(&rs->rs_lock);
2212         if (rs->rs_transno <= exp->exp_last_committed ||
2213             (!rs->rs_on_net && !rs->rs_no_ack) ||
2214              cfs_list_empty(&rs->rs_exp_list) ||     /* completed already */
2215              cfs_list_empty(&rs->rs_obd_list)) {
2216                 CDEBUG(D_HA, "Schedule reply immediately\n");
2217                 ptlrpc_dispatch_difficult_reply(rs);
2218         } else {
2219                 cfs_list_add (&rs->rs_list, &svc->srv_active_replies);
2220                 rs->rs_scheduled = 0;           /* allow notifier to schedule */
2221         }
2222         cfs_spin_unlock(&rs->rs_lock);
2223         cfs_spin_unlock(&svc->srv_lock);
2224         EXIT;
2225 }
2226
2227 int target_handle_ping(struct ptlrpc_request *req)
2228 {
2229         obd_ping(req->rq_export);
2230         return req_capsule_server_pack(&req->rq_pill);
2231 }
2232
2233 void target_committed_to_req(struct ptlrpc_request *req)
2234 {
2235         struct obd_export *exp = req->rq_export;
2236
2237         if (!exp->exp_obd->obd_no_transno && req->rq_repmsg != NULL)
2238                 lustre_msg_set_last_committed(req->rq_repmsg,
2239                                               exp->exp_last_committed);
2240         else
2241                 DEBUG_REQ(D_IOCTL, req, "not sending last_committed update (%d/"
2242                           "%d)", exp->exp_obd->obd_no_transno,
2243                           req->rq_repmsg == NULL);
2244
2245         CDEBUG(D_INFO, "last_committed "LPU64", transno "LPU64", xid "LPU64"\n",
2246                exp->exp_last_committed, req->rq_transno, req->rq_xid);
2247 }
2248 EXPORT_SYMBOL(target_committed_to_req);
2249
2250 int target_handle_qc_callback(struct ptlrpc_request *req)
2251 {
2252         struct obd_quotactl *oqctl;
2253         struct client_obd *cli = &req->rq_export->exp_obd->u.cli;
2254
2255         oqctl = req_capsule_client_get(&req->rq_pill, &RMF_OBD_QUOTACTL);
2256         if (oqctl == NULL) {
2257                 CERROR("Can't unpack obd_quotactl\n");
2258                 RETURN(-EPROTO);
2259         }
2260
2261         cli->cl_qchk_stat = oqctl->qc_stat;
2262
2263         return 0;
2264 }
2265
2266 #ifdef HAVE_QUOTA_SUPPORT
2267 int target_handle_dqacq_callback(struct ptlrpc_request *req)
2268 {
2269 #ifdef __KERNEL__
2270         struct obd_device *obd = req->rq_export->exp_obd;
2271         struct obd_device *master_obd = NULL, *lov_obd = NULL;
2272         struct obd_device_target *obt;
2273         struct lustre_quota_ctxt *qctxt;
2274         struct qunit_data *qdata = NULL;
2275         int rc = 0;
2276         ENTRY;
2277
2278         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_DROP_QUOTA_REQ))
2279                 RETURN(rc);
2280
2281         rc = req_capsule_server_pack(&req->rq_pill);
2282         if (rc) {
2283                 CERROR("packing reply failed!: rc = %d\n", rc);
2284                 RETURN(rc);
2285         }
2286
2287         LASSERT(req->rq_export);
2288
2289         qdata = quota_get_qdata(req, QUOTA_REQUEST, QUOTA_EXPORT);
2290         if (IS_ERR(qdata)) {
2291                 rc = PTR_ERR(qdata);
2292                 CDEBUG(D_ERROR, "Can't unpack qunit_data(rc: %d)\n", rc);
2293                 req->rq_status = rc;
2294                 GOTO(out, rc);
2295         }
2296
2297         /* we use the observer */
2298         if (obd_pin_observer(obd, &lov_obd) ||
2299             obd_pin_observer(lov_obd, &master_obd)) {
2300                 CERROR("Can't find the observer, it is recovering\n");
2301                 req->rq_status = -EAGAIN;
2302                 GOTO(out, rc);
2303         }
2304
2305         obt = &master_obd->u.obt;
2306         qctxt = &obt->obt_qctxt;
2307
2308         if (!qctxt->lqc_setup || !qctxt->lqc_valid) {
2309                 /* quota_type has not been processed yet, return EAGAIN
2310                  * until we know whether or not quotas are supposed to
2311                  * be enabled */
2312                 CDEBUG(D_QUOTA, "quota_type not processed yet, return "
2313                        "-EAGAIN\n");
2314                 req->rq_status = -EAGAIN;
2315                 GOTO(out, rc);
2316         }
2317
2318         cfs_down_read(&obt->obt_rwsem);
2319         if (qctxt->lqc_lqs_hash == NULL) {
2320                 cfs_up_read(&obt->obt_rwsem);
2321                 /* quota_type has not been processed yet, return EAGAIN
2322                  * until we know whether or not quotas are supposed to
2323                  * be enabled */
2324                 CDEBUG(D_QUOTA, "quota_ctxt is not ready yet, return "
2325                        "-EAGAIN\n");
2326                 req->rq_status = -EAGAIN;
2327                 GOTO(out, rc);
2328         }
2329
2330         LASSERT(qctxt->lqc_handler);
2331         rc = qctxt->lqc_handler(master_obd, qdata,
2332                                 lustre_msg_get_opc(req->rq_reqmsg));
2333         cfs_up_read(&obt->obt_rwsem);
2334         if (rc && rc != -EDQUOT)
2335                 CDEBUG(rc == -EBUSY  ? D_QUOTA : D_ERROR,
2336                        "dqacq/dqrel failed! (rc:%d)\n", rc);
2337         req->rq_status = rc;
2338
2339         rc = quota_copy_qdata(req, qdata, QUOTA_REPLY, QUOTA_EXPORT);
2340         if (rc < 0) {
2341                 CERROR("Can't pack qunit_data(rc: %d)\n", rc);
2342                 GOTO(out, rc);
2343         }
2344
2345         /* Block the quota req. b=14840 */
2346         OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_BLOCK_QUOTA_REQ, obd_timeout);
2347         EXIT;
2348
2349 out:
2350         if (master_obd)
2351                 obd_unpin_observer(lov_obd);
2352         if (lov_obd)
2353                 obd_unpin_observer(obd);
2354
2355         rc = ptlrpc_reply(req);
2356         return rc;
2357 #else
2358         return 0;
2359 #endif /* !__KERNEL__ */
2360 }
2361 #endif /* HAVE_QUOTA_SUPPORT */
2362
2363 /* Send a remote set_info_async.
2364  * This may go from client to server or server to client
2365  */
2366 int target_set_info_rpc(struct obd_import *imp, int opcode,
2367                         obd_count keylen, void *key,
2368                         obd_count vallen, void *val,
2369                         struct ptlrpc_request_set *set)
2370 {
2371         struct ptlrpc_request *req;
2372         char                  *tmp;
2373         int                    rc;
2374         ENTRY;
2375
2376         req = ptlrpc_request_alloc(imp, &RQF_OBD_SET_INFO);
2377         if (req == NULL)
2378                 RETURN(-ENOMEM);
2379
2380         req_capsule_set_size(&req->rq_pill, &RMF_SETINFO_KEY,
2381                              RCL_CLIENT, keylen);
2382         req_capsule_set_size(&req->rq_pill, &RMF_SETINFO_VAL,
2383                              RCL_CLIENT, vallen);
2384         rc = ptlrpc_request_pack(req, LUSTRE_OBD_VERSION, opcode);
2385         if (rc) {
2386                 ptlrpc_request_free(req);
2387                 RETURN(rc);
2388         }
2389
2390         tmp = req_capsule_client_get(&req->rq_pill, &RMF_SETINFO_KEY);
2391         memcpy(tmp, key, keylen);
2392         tmp = req_capsule_client_get(&req->rq_pill, &RMF_SETINFO_VAL);
2393         memcpy(tmp, val, vallen);
2394
2395         ptlrpc_request_set_replen(req);
2396
2397         if (set) {
2398                 ptlrpc_set_add_req(set, req);
2399                 ptlrpc_check_set(NULL, set);
2400         } else {
2401                 rc = ptlrpc_queue_wait(req);
2402                 ptlrpc_req_finished(req);
2403         }
2404
2405         RETURN(rc);
2406 }
2407 EXPORT_SYMBOL(target_set_info_rpc);
2408
2409
2410 ldlm_mode_t lck_compat_array[] = {
2411         [LCK_EX] LCK_COMPAT_EX,
2412         [LCK_PW] LCK_COMPAT_PW,
2413         [LCK_PR] LCK_COMPAT_PR,
2414         [LCK_CW] LCK_COMPAT_CW,
2415         [LCK_CR] LCK_COMPAT_CR,
2416         [LCK_NL] LCK_COMPAT_NL,
2417         [LCK_GROUP] LCK_COMPAT_GROUP,
2418         [LCK_COS] LCK_COMPAT_COS,
2419 };
2420
2421 /**
2422  * Rather arbitrary mapping from LDLM error codes to errno values. This should
2423  * not escape to the user level.
2424  */
2425 int ldlm_error2errno(ldlm_error_t error)
2426 {
2427         int result;
2428
2429         switch (error) {
2430         case ELDLM_OK:
2431                 result = 0;
2432                 break;
2433         case ELDLM_LOCK_CHANGED:
2434                 result = -ESTALE;
2435                 break;
2436         case ELDLM_LOCK_ABORTED:
2437                 result = -ENAVAIL;
2438                 break;
2439         case ELDLM_LOCK_REPLACED:
2440                 result = -ESRCH;
2441                 break;
2442         case ELDLM_NO_LOCK_DATA:
2443                 result = -ENOENT;
2444                 break;
2445         case ELDLM_NAMESPACE_EXISTS:
2446                 result = -EEXIST;
2447                 break;
2448         case ELDLM_BAD_NAMESPACE:
2449                 result = -EBADF;
2450                 break;
2451         default:
2452                 if (((int)error) < 0)  /* cast to signed type */
2453                         result = error; /* as ldlm_error_t can be unsigned */
2454                 else {
2455                         CERROR("Invalid DLM result code: %i\n", error);
2456                         result = -EPROTO;
2457                 }
2458         }
2459         return result;
2460 }
2461 EXPORT_SYMBOL(ldlm_error2errno);
2462
2463 /**
2464  * Dual to ldlm_error2errno(): maps errno values back to ldlm_error_t.
2465  */
2466 ldlm_error_t ldlm_errno2error(int err_no)
2467 {
2468         int error;
2469
2470         switch (err_no) {
2471         case 0:
2472                 error = ELDLM_OK;
2473                 break;
2474         case -ESTALE:
2475                 error = ELDLM_LOCK_CHANGED;
2476                 break;
2477         case -ENAVAIL:
2478                 error = ELDLM_LOCK_ABORTED;
2479                 break;
2480         case -ESRCH:
2481                 error = ELDLM_LOCK_REPLACED;
2482                 break;
2483         case -ENOENT:
2484                 error = ELDLM_NO_LOCK_DATA;
2485                 break;
2486         case -EEXIST:
2487                 error = ELDLM_NAMESPACE_EXISTS;
2488                 break;
2489         case -EBADF:
2490                 error = ELDLM_BAD_NAMESPACE;
2491                 break;
2492         default:
2493                 error = err_no;
2494         }
2495         return error;
2496 }
2497 EXPORT_SYMBOL(ldlm_errno2error);
2498
2499 #if LUSTRE_TRACKS_LOCK_EXP_REFS
2500 void ldlm_dump_export_locks(struct obd_export *exp)
2501 {
2502         cfs_spin_lock(&exp->exp_locks_list_guard);
2503         if (!cfs_list_empty(&exp->exp_locks_list)) {
2504             struct ldlm_lock *lock;
2505
2506             CERROR("dumping locks for export %p,"
2507                    "ignore if the unmount doesn't hang\n", exp);
2508             cfs_list_for_each_entry(lock, &exp->exp_locks_list, l_exp_refs_link)
2509                 ldlm_lock_dump(D_ERROR, lock, 0);
2510         }
2511         cfs_spin_unlock(&exp->exp_locks_list_guard);
2512 }
2513 #endif