1 /*
2 * GPL HEADER START
3 *
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
19 *
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
22 * have any questions.
23 *
24 * GPL HEADER END
25 */
26 /*
27 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
29 *
30 * Copyright (c) 2011, 2012, Intel Corporation.
31 */
32 /*
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
35 *
36 * lustre/mgc/mgc_request.c
37 *
38 * Author: Nathan Rutman <nathan@clusterfs.com>
39 */
40
41 #define DEBUG_SUBSYSTEM S_MGC
42 #define D_MGC D_CONFIG /*|D_WARNING*/
43
44 #include <linux/module.h>
45 #include "../include/obd_class.h"
46 #include "../include/lustre_dlm.h"
47 #include "../include/lprocfs_status.h"
48 #include "../include/lustre_log.h"
49 #include "../include/lustre_disk.h"
50
51 #include "mgc_internal.h"
52
mgc_name2resid(char * name,int len,struct ldlm_res_id * res_id,int type)53 static int mgc_name2resid(char *name, int len, struct ldlm_res_id *res_id,
54 int type)
55 {
56 __u64 resname = 0;
57
58 if (len > sizeof(resname)) {
59 CERROR("name too long: %s\n", name);
60 return -EINVAL;
61 }
62 if (len <= 0) {
63 CERROR("missing name: %s\n", name);
64 return -EINVAL;
65 }
66 memcpy(&resname, name, len);
67
68 /* Always use the same endianness for the resid */
69 memset(res_id, 0, sizeof(*res_id));
70 res_id->name[0] = cpu_to_le64(resname);
71 /* XXX: unfortunately, sptlprc and config llog share one lock */
72 switch (type) {
73 case CONFIG_T_CONFIG:
74 case CONFIG_T_SPTLRPC:
75 resname = 0;
76 break;
77 case CONFIG_T_RECOVER:
78 case CONFIG_T_PARAMS:
79 resname = type;
80 break;
81 default:
82 LBUG();
83 }
84 res_id->name[1] = cpu_to_le64(resname);
85 CDEBUG(D_MGC, "log %s to resid %#llx/%#llx (%.8s)\n", name,
86 res_id->name[0], res_id->name[1], (char *)&res_id->name[0]);
87 return 0;
88 }
89
mgc_fsname2resid(char * fsname,struct ldlm_res_id * res_id,int type)90 int mgc_fsname2resid(char *fsname, struct ldlm_res_id *res_id, int type)
91 {
92 /* fsname is at most 8 chars long, maybe contain "-".
93 * e.g. "lustre", "SUN-000" */
94 return mgc_name2resid(fsname, strlen(fsname), res_id, type);
95 }
96 EXPORT_SYMBOL(mgc_fsname2resid);
97
mgc_logname2resid(char * logname,struct ldlm_res_id * res_id,int type)98 int mgc_logname2resid(char *logname, struct ldlm_res_id *res_id, int type)
99 {
100 char *name_end;
101 int len;
102
103 /* logname consists of "fsname-nodetype".
104 * e.g. "lustre-MDT0001", "SUN-000-client"
105 * there is an exception: llog "params" */
106 name_end = strrchr(logname, '-');
107 if (!name_end)
108 len = strlen(logname);
109 else
110 len = name_end - logname;
111 return mgc_name2resid(logname, len, res_id, type);
112 }
113
114 /********************** config llog list **********************/
115 static LIST_HEAD(config_llog_list);
116 static DEFINE_SPINLOCK(config_list_lock);
117
118 /* Take a reference to a config log */
config_log_get(struct config_llog_data * cld)119 static int config_log_get(struct config_llog_data *cld)
120 {
121 atomic_inc(&cld->cld_refcount);
122 CDEBUG(D_INFO, "log %s refs %d\n", cld->cld_logname,
123 atomic_read(&cld->cld_refcount));
124 return 0;
125 }
126
127 /* Drop a reference to a config log. When no longer referenced,
128 we can free the config log data */
config_log_put(struct config_llog_data * cld)129 static void config_log_put(struct config_llog_data *cld)
130 {
131 CDEBUG(D_INFO, "log %s refs %d\n", cld->cld_logname,
132 atomic_read(&cld->cld_refcount));
133 LASSERT(atomic_read(&cld->cld_refcount) > 0);
134
135 /* spinlock to make sure no item with 0 refcount in the list */
136 if (atomic_dec_and_lock(&cld->cld_refcount, &config_list_lock)) {
137 list_del(&cld->cld_list_chain);
138 spin_unlock(&config_list_lock);
139
140 CDEBUG(D_MGC, "dropping config log %s\n", cld->cld_logname);
141
142 if (cld->cld_recover)
143 config_log_put(cld->cld_recover);
144 if (cld->cld_sptlrpc)
145 config_log_put(cld->cld_sptlrpc);
146 if (cld->cld_params)
147 config_log_put(cld->cld_params);
148 if (cld_is_sptlrpc(cld))
149 sptlrpc_conf_log_stop(cld->cld_logname);
150
151 class_export_put(cld->cld_mgcexp);
152 OBD_FREE(cld, sizeof(*cld) + strlen(cld->cld_logname) + 1);
153 }
154 }
155
156 /* Find a config log by name */
157 static
config_log_find(char * logname,struct config_llog_instance * cfg)158 struct config_llog_data *config_log_find(char *logname,
159 struct config_llog_instance *cfg)
160 {
161 struct config_llog_data *cld;
162 struct config_llog_data *found = NULL;
163 void * instance;
164
165 LASSERT(logname != NULL);
166
167 instance = cfg ? cfg->cfg_instance : NULL;
168 spin_lock(&config_list_lock);
169 list_for_each_entry(cld, &config_llog_list, cld_list_chain) {
170 /* check if instance equals */
171 if (instance != cld->cld_cfg.cfg_instance)
172 continue;
173
174 /* instance may be NULL, should check name */
175 if (strcmp(logname, cld->cld_logname) == 0) {
176 found = cld;
177 break;
178 }
179 }
180 if (found) {
181 atomic_inc(&found->cld_refcount);
182 LASSERT(found->cld_stopping == 0 || cld_is_sptlrpc(found) == 0);
183 }
184 spin_unlock(&config_list_lock);
185 return found;
186 }
187
188 static
do_config_log_add(struct obd_device * obd,char * logname,int type,struct config_llog_instance * cfg,struct super_block * sb)189 struct config_llog_data *do_config_log_add(struct obd_device *obd,
190 char *logname,
191 int type,
192 struct config_llog_instance *cfg,
193 struct super_block *sb)
194 {
195 struct config_llog_data *cld;
196 int rc;
197
198 CDEBUG(D_MGC, "do adding config log %s:%p\n", logname,
199 cfg ? cfg->cfg_instance : NULL);
200
201 OBD_ALLOC(cld, sizeof(*cld) + strlen(logname) + 1);
202 if (!cld)
203 return ERR_PTR(-ENOMEM);
204
205 strcpy(cld->cld_logname, logname);
206 if (cfg)
207 cld->cld_cfg = *cfg;
208 else
209 cld->cld_cfg.cfg_callback = class_config_llog_handler;
210 mutex_init(&cld->cld_lock);
211 cld->cld_cfg.cfg_last_idx = 0;
212 cld->cld_cfg.cfg_flags = 0;
213 cld->cld_cfg.cfg_sb = sb;
214 cld->cld_type = type;
215 atomic_set(&cld->cld_refcount, 1);
216
217 /* Keep the mgc around until we are done */
218 cld->cld_mgcexp = class_export_get(obd->obd_self_export);
219
220 if (cld_is_sptlrpc(cld)) {
221 sptlrpc_conf_log_start(logname);
222 cld->cld_cfg.cfg_obdname = obd->obd_name;
223 }
224
225 rc = mgc_logname2resid(logname, &cld->cld_resid, type);
226
227 spin_lock(&config_list_lock);
228 list_add(&cld->cld_list_chain, &config_llog_list);
229 spin_unlock(&config_list_lock);
230
231 if (rc) {
232 config_log_put(cld);
233 return ERR_PTR(rc);
234 }
235
236 if (cld_is_sptlrpc(cld)) {
237 rc = mgc_process_log(obd, cld);
238 if (rc && rc != -ENOENT)
239 CERROR("failed processing sptlrpc log: %d\n", rc);
240 }
241
242 return cld;
243 }
244
config_recover_log_add(struct obd_device * obd,char * fsname,struct config_llog_instance * cfg,struct super_block * sb)245 static struct config_llog_data *config_recover_log_add(struct obd_device *obd,
246 char *fsname,
247 struct config_llog_instance *cfg,
248 struct super_block *sb)
249 {
250 struct config_llog_instance lcfg = *cfg;
251 struct lustre_sb_info *lsi = s2lsi(sb);
252 struct config_llog_data *cld;
253 char logname[32];
254
255 if (IS_OST(lsi))
256 return NULL;
257
258 /* for osp-on-ost, see lustre_start_osp() */
259 if (IS_MDT(lsi) && lcfg.cfg_instance)
260 return NULL;
261
262 /* we have to use different llog for clients and mdts for cmd
263 * where only clients are notified if one of cmd server restarts */
264 LASSERT(strlen(fsname) < sizeof(logname) / 2);
265 strcpy(logname, fsname);
266 if (IS_SERVER(lsi)) { /* mdt */
267 LASSERT(lcfg.cfg_instance == NULL);
268 lcfg.cfg_instance = sb;
269 strcat(logname, "-mdtir");
270 } else {
271 LASSERT(lcfg.cfg_instance != NULL);
272 strcat(logname, "-cliir");
273 }
274
275 cld = do_config_log_add(obd, logname, CONFIG_T_RECOVER, &lcfg, sb);
276 return cld;
277 }
278
config_params_log_add(struct obd_device * obd,struct config_llog_instance * cfg,struct super_block * sb)279 static struct config_llog_data *config_params_log_add(struct obd_device *obd,
280 struct config_llog_instance *cfg, struct super_block *sb)
281 {
282 struct config_llog_instance lcfg = *cfg;
283 struct config_llog_data *cld;
284
285 lcfg.cfg_instance = sb;
286
287 cld = do_config_log_add(obd, PARAMS_FILENAME, CONFIG_T_PARAMS,
288 &lcfg, sb);
289
290 return cld;
291 }
292
293 /** Add this log to the list of active logs watched by an MGC.
294 * Active means we're watching for updates.
295 * We have one active log per "mount" - client instance or servername.
296 * Each instance may be at a different point in the log.
297 */
config_log_add(struct obd_device * obd,char * logname,struct config_llog_instance * cfg,struct super_block * sb)298 static int config_log_add(struct obd_device *obd, char *logname,
299 struct config_llog_instance *cfg,
300 struct super_block *sb)
301 {
302 struct lustre_sb_info *lsi = s2lsi(sb);
303 struct config_llog_data *cld;
304 struct config_llog_data *sptlrpc_cld;
305 struct config_llog_data *params_cld;
306 char seclogname[32];
307 char *ptr;
308 int rc;
309
310 CDEBUG(D_MGC, "adding config log %s:%p\n", logname, cfg->cfg_instance);
311
312 /*
313 * for each regular log, the depended sptlrpc log name is
314 * <fsname>-sptlrpc. multiple regular logs may share one sptlrpc log.
315 */
316 ptr = strrchr(logname, '-');
317 if (ptr == NULL || ptr - logname > 8) {
318 CERROR("logname %s is too long\n", logname);
319 return -EINVAL;
320 }
321
322 memcpy(seclogname, logname, ptr - logname);
323 strcpy(seclogname + (ptr - logname), "-sptlrpc");
324
325 sptlrpc_cld = config_log_find(seclogname, NULL);
326 if (sptlrpc_cld == NULL) {
327 sptlrpc_cld = do_config_log_add(obd, seclogname,
328 CONFIG_T_SPTLRPC, NULL, NULL);
329 if (IS_ERR(sptlrpc_cld)) {
330 CERROR("can't create sptlrpc log: %s\n", seclogname);
331 rc = PTR_ERR(sptlrpc_cld);
332 goto out_err;
333 }
334 }
335 params_cld = config_params_log_add(obd, cfg, sb);
336 if (IS_ERR(params_cld)) {
337 rc = PTR_ERR(params_cld);
338 CERROR("%s: can't create params log: rc = %d\n",
339 obd->obd_name, rc);
340 goto out_err1;
341 }
342
343 cld = do_config_log_add(obd, logname, CONFIG_T_CONFIG, cfg, sb);
344 if (IS_ERR(cld)) {
345 CERROR("can't create log: %s\n", logname);
346 rc = PTR_ERR(cld);
347 goto out_err2;
348 }
349
350 cld->cld_sptlrpc = sptlrpc_cld;
351 cld->cld_params = params_cld;
352
353 LASSERT(lsi->lsi_lmd);
354 if (!(lsi->lsi_lmd->lmd_flags & LMD_FLG_NOIR)) {
355 struct config_llog_data *recover_cld;
356 *strrchr(seclogname, '-') = 0;
357 recover_cld = config_recover_log_add(obd, seclogname, cfg, sb);
358 if (IS_ERR(recover_cld)) {
359 rc = PTR_ERR(recover_cld);
360 goto out_err3;
361 }
362 cld->cld_recover = recover_cld;
363 }
364
365 return 0;
366
367 out_err3:
368 config_log_put(cld);
369
370 out_err2:
371 config_log_put(params_cld);
372
373 out_err1:
374 config_log_put(sptlrpc_cld);
375
376 out_err:
377 return rc;
378 }
379
380 DEFINE_MUTEX(llog_process_lock);
381
382 /** Stop watching for updates on this log.
383 */
config_log_end(char * logname,struct config_llog_instance * cfg)384 static int config_log_end(char *logname, struct config_llog_instance *cfg)
385 {
386 struct config_llog_data *cld;
387 struct config_llog_data *cld_sptlrpc = NULL;
388 struct config_llog_data *cld_params = NULL;
389 struct config_llog_data *cld_recover = NULL;
390 int rc = 0;
391
392 cld = config_log_find(logname, cfg);
393 if (cld == NULL)
394 return -ENOENT;
395
396 mutex_lock(&cld->cld_lock);
397 /*
398 * if cld_stopping is set, it means we didn't start the log thus
399 * not owning the start ref. this can happen after previous umount:
400 * the cld still hanging there waiting for lock cancel, and we
401 * remount again but failed in the middle and call log_end without
402 * calling start_log.
403 */
404 if (unlikely(cld->cld_stopping)) {
405 mutex_unlock(&cld->cld_lock);
406 /* drop the ref from the find */
407 config_log_put(cld);
408 return rc;
409 }
410
411 cld->cld_stopping = 1;
412
413 cld_recover = cld->cld_recover;
414 cld->cld_recover = NULL;
415 mutex_unlock(&cld->cld_lock);
416
417 if (cld_recover) {
418 mutex_lock(&cld_recover->cld_lock);
419 cld_recover->cld_stopping = 1;
420 mutex_unlock(&cld_recover->cld_lock);
421 config_log_put(cld_recover);
422 }
423
424 spin_lock(&config_list_lock);
425 cld_sptlrpc = cld->cld_sptlrpc;
426 cld->cld_sptlrpc = NULL;
427 cld_params = cld->cld_params;
428 cld->cld_params = NULL;
429 spin_unlock(&config_list_lock);
430
431 if (cld_sptlrpc)
432 config_log_put(cld_sptlrpc);
433
434 if (cld_params) {
435 mutex_lock(&cld_params->cld_lock);
436 cld_params->cld_stopping = 1;
437 mutex_unlock(&cld_params->cld_lock);
438 config_log_put(cld_params);
439 }
440
441 /* drop the ref from the find */
442 config_log_put(cld);
443 /* drop the start ref */
444 config_log_put(cld);
445
446 CDEBUG(D_MGC, "end config log %s (%d)\n", logname ? logname : "client",
447 rc);
448 return rc;
449 }
450
451 #if defined (CONFIG_PROC_FS)
lprocfs_mgc_rd_ir_state(struct seq_file * m,void * data)452 int lprocfs_mgc_rd_ir_state(struct seq_file *m, void *data)
453 {
454 struct obd_device *obd = data;
455 struct obd_import *imp = obd->u.cli.cl_import;
456 struct obd_connect_data *ocd = &imp->imp_connect_data;
457 struct config_llog_data *cld;
458
459 seq_printf(m, "imperative_recovery: %s\n",
460 OCD_HAS_FLAG(ocd, IMP_RECOV) ? "ENABLED" : "DISABLED");
461 seq_printf(m, "client_state:\n");
462
463 spin_lock(&config_list_lock);
464 list_for_each_entry(cld, &config_llog_list, cld_list_chain) {
465 if (cld->cld_recover == NULL)
466 continue;
467 seq_printf(m, " - { client: %s, nidtbl_version: %u }\n",
468 cld->cld_logname,
469 cld->cld_recover->cld_cfg.cfg_last_idx);
470 }
471 spin_unlock(&config_list_lock);
472
473 return 0;
474 }
475 #endif
476
477 /* reenqueue any lost locks */
478 #define RQ_RUNNING 0x1
479 #define RQ_NOW 0x2
480 #define RQ_LATER 0x4
481 #define RQ_STOP 0x8
482 static int rq_state = 0;
483 static wait_queue_head_t rq_waitq;
484 static DECLARE_COMPLETION(rq_exit);
485
do_requeue(struct config_llog_data * cld)486 static void do_requeue(struct config_llog_data *cld)
487 {
488 LASSERT(atomic_read(&cld->cld_refcount) > 0);
489
490 /* Do not run mgc_process_log on a disconnected export or an
491 export which is being disconnected. Take the client
492 semaphore to make the check non-racy. */
493 down_read(&cld->cld_mgcexp->exp_obd->u.cli.cl_sem);
494 if (cld->cld_mgcexp->exp_obd->u.cli.cl_conn_count != 0) {
495 CDEBUG(D_MGC, "updating log %s\n", cld->cld_logname);
496 mgc_process_log(cld->cld_mgcexp->exp_obd, cld);
497 } else {
498 CDEBUG(D_MGC, "disconnecting, won't update log %s\n",
499 cld->cld_logname);
500 }
501 up_read(&cld->cld_mgcexp->exp_obd->u.cli.cl_sem);
502 }
503
504 /* this timeout represents how many seconds MGC should wait before
505 * requeue config and recover lock to the MGS. We need to randomize this
506 * in order to not flood the MGS.
507 */
508 #define MGC_TIMEOUT_MIN_SECONDS 5
509 #define MGC_TIMEOUT_RAND_CENTISEC 0x1ff /* ~500 */
510
mgc_requeue_thread(void * data)511 static int mgc_requeue_thread(void *data)
512 {
513 int rc = 0;
514
515 CDEBUG(D_MGC, "Starting requeue thread\n");
516
517 /* Keep trying failed locks periodically */
518 spin_lock(&config_list_lock);
519 rq_state |= RQ_RUNNING;
520 while (1) {
521 struct l_wait_info lwi;
522 struct config_llog_data *cld, *cld_prev;
523 int rand = cfs_rand() & MGC_TIMEOUT_RAND_CENTISEC;
524 int stopped = !!(rq_state & RQ_STOP);
525 int to;
526
527 /* Any new or requeued lostlocks will change the state */
528 rq_state &= ~(RQ_NOW | RQ_LATER);
529 spin_unlock(&config_list_lock);
530
531 /* Always wait a few seconds to allow the server who
532 caused the lock revocation to finish its setup, plus some
533 random so everyone doesn't try to reconnect at once. */
534 to = MGC_TIMEOUT_MIN_SECONDS * HZ;
535 to += rand * HZ / 100; /* rand is centi-seconds */
536 lwi = LWI_TIMEOUT(to, NULL, NULL);
537 l_wait_event(rq_waitq, rq_state & RQ_STOP, &lwi);
538
539 /*
540 * iterate & processing through the list. for each cld, process
541 * its depending sptlrpc cld firstly (if any) and then itself.
542 *
543 * it's guaranteed any item in the list must have
544 * reference > 0; and if cld_lostlock is set, at
545 * least one reference is taken by the previous enqueue.
546 */
547 cld_prev = NULL;
548
549 spin_lock(&config_list_lock);
550 list_for_each_entry(cld, &config_llog_list,
551 cld_list_chain) {
552 if (!cld->cld_lostlock)
553 continue;
554
555 spin_unlock(&config_list_lock);
556
557 LASSERT(atomic_read(&cld->cld_refcount) > 0);
558
559 /* Whether we enqueued again or not in mgc_process_log,
560 * we're done with the ref from the old enqueue */
561 if (cld_prev)
562 config_log_put(cld_prev);
563 cld_prev = cld;
564
565 cld->cld_lostlock = 0;
566 if (likely(!stopped))
567 do_requeue(cld);
568
569 spin_lock(&config_list_lock);
570 }
571 spin_unlock(&config_list_lock);
572 if (cld_prev)
573 config_log_put(cld_prev);
574
575 /* break after scanning the list so that we can drop
576 * refcount to losing lock clds */
577 if (unlikely(stopped)) {
578 spin_lock(&config_list_lock);
579 break;
580 }
581
582 /* Wait a bit to see if anyone else needs a requeue */
583 lwi = (struct l_wait_info) { 0 };
584 l_wait_event(rq_waitq, rq_state & (RQ_NOW | RQ_STOP),
585 &lwi);
586 spin_lock(&config_list_lock);
587 }
588 /* spinlock and while guarantee RQ_NOW and RQ_LATER are not set */
589 rq_state &= ~RQ_RUNNING;
590 spin_unlock(&config_list_lock);
591
592 complete(&rq_exit);
593
594 CDEBUG(D_MGC, "Ending requeue thread\n");
595 return rc;
596 }
597
598 /* Add a cld to the list to requeue. Start the requeue thread if needed.
599 We are responsible for dropping the config log reference from here on out. */
mgc_requeue_add(struct config_llog_data * cld)600 static void mgc_requeue_add(struct config_llog_data *cld)
601 {
602 CDEBUG(D_INFO, "log %s: requeue (r=%d sp=%d st=%x)\n",
603 cld->cld_logname, atomic_read(&cld->cld_refcount),
604 cld->cld_stopping, rq_state);
605 LASSERT(atomic_read(&cld->cld_refcount) > 0);
606
607 mutex_lock(&cld->cld_lock);
608 if (cld->cld_stopping || cld->cld_lostlock) {
609 mutex_unlock(&cld->cld_lock);
610 return;
611 }
612 /* this refcount will be released in mgc_requeue_thread. */
613 config_log_get(cld);
614 cld->cld_lostlock = 1;
615 mutex_unlock(&cld->cld_lock);
616
617 /* Hold lock for rq_state */
618 spin_lock(&config_list_lock);
619 if (rq_state & RQ_STOP) {
620 spin_unlock(&config_list_lock);
621 cld->cld_lostlock = 0;
622 config_log_put(cld);
623 } else {
624 rq_state |= RQ_NOW;
625 spin_unlock(&config_list_lock);
626 wake_up(&rq_waitq);
627 }
628 }
629
mgc_llog_init(const struct lu_env * env,struct obd_device * obd)630 static int mgc_llog_init(const struct lu_env *env, struct obd_device *obd)
631 {
632 struct llog_ctxt *ctxt;
633 int rc;
634
635 /* setup only remote ctxt, the local disk context is switched per each
636 * filesystem during mgc_fs_setup() */
637 rc = llog_setup(env, obd, &obd->obd_olg, LLOG_CONFIG_REPL_CTXT, obd,
638 &llog_client_ops);
639 if (rc)
640 return rc;
641
642 ctxt = llog_get_context(obd, LLOG_CONFIG_REPL_CTXT);
643 LASSERT(ctxt);
644
645 llog_initiator_connect(ctxt);
646 llog_ctxt_put(ctxt);
647
648 return 0;
649 }
650
mgc_llog_fini(const struct lu_env * env,struct obd_device * obd)651 static int mgc_llog_fini(const struct lu_env *env, struct obd_device *obd)
652 {
653 struct llog_ctxt *ctxt;
654
655 ctxt = llog_get_context(obd, LLOG_CONFIG_REPL_CTXT);
656 if (ctxt)
657 llog_cleanup(env, ctxt);
658
659 return 0;
660 }
661
662 static atomic_t mgc_count = ATOMIC_INIT(0);
mgc_precleanup(struct obd_device * obd,enum obd_cleanup_stage stage)663 static int mgc_precleanup(struct obd_device *obd, enum obd_cleanup_stage stage)
664 {
665 int rc = 0;
666
667 switch (stage) {
668 case OBD_CLEANUP_EARLY:
669 break;
670 case OBD_CLEANUP_EXPORTS:
671 if (atomic_dec_and_test(&mgc_count)) {
672 int running;
673 /* stop requeue thread */
674 spin_lock(&config_list_lock);
675 running = rq_state & RQ_RUNNING;
676 if (running)
677 rq_state |= RQ_STOP;
678 spin_unlock(&config_list_lock);
679 if (running) {
680 wake_up(&rq_waitq);
681 wait_for_completion(&rq_exit);
682 }
683 }
684 obd_cleanup_client_import(obd);
685 rc = mgc_llog_fini(NULL, obd);
686 if (rc != 0)
687 CERROR("failed to cleanup llogging subsystems\n");
688 break;
689 }
690 return rc;
691 }
692
mgc_cleanup(struct obd_device * obd)693 static int mgc_cleanup(struct obd_device *obd)
694 {
695 int rc;
696
697 /* COMPAT_146 - old config logs may have added profiles we don't
698 know about */
699 if (obd->obd_type->typ_refcnt <= 1)
700 /* Only for the last mgc */
701 class_del_profiles();
702
703 lprocfs_obd_cleanup(obd);
704 ptlrpcd_decref();
705
706 rc = client_obd_cleanup(obd);
707 return rc;
708 }
709
mgc_setup(struct obd_device * obd,struct lustre_cfg * lcfg)710 static int mgc_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
711 {
712 struct lprocfs_static_vars lvars;
713 int rc;
714
715 ptlrpcd_addref();
716
717 rc = client_obd_setup(obd, lcfg);
718 if (rc)
719 goto err_decref;
720
721 rc = mgc_llog_init(NULL, obd);
722 if (rc) {
723 CERROR("failed to setup llogging subsystems\n");
724 goto err_cleanup;
725 }
726
727 lprocfs_mgc_init_vars(&lvars);
728 lprocfs_obd_setup(obd, lvars.obd_vars);
729 sptlrpc_lprocfs_cliobd_attach(obd);
730
731 if (atomic_inc_return(&mgc_count) == 1) {
732 rq_state = 0;
733 init_waitqueue_head(&rq_waitq);
734
735 /* start requeue thread */
736 rc = PTR_ERR(kthread_run(mgc_requeue_thread, NULL,
737 "ll_cfg_requeue"));
738 if (IS_ERR_VALUE(rc)) {
739 CERROR("%s: Cannot start requeue thread (%d),"
740 "no more log updates!\n",
741 obd->obd_name, rc);
742 goto err_cleanup;
743 }
744 /* rc is the task_struct pointer of mgc_requeue_thread. */
745 rc = 0;
746 }
747
748 return rc;
749
750 err_cleanup:
751 client_obd_cleanup(obd);
752 err_decref:
753 ptlrpcd_decref();
754 return rc;
755 }
756
757 /* based on ll_mdc_blocking_ast */
mgc_blocking_ast(struct ldlm_lock * lock,struct ldlm_lock_desc * desc,void * data,int flag)758 static int mgc_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
759 void *data, int flag)
760 {
761 struct lustre_handle lockh;
762 struct config_llog_data *cld = (struct config_llog_data *)data;
763 int rc = 0;
764
765 switch (flag) {
766 case LDLM_CB_BLOCKING:
767 /* mgs wants the lock, give it up... */
768 LDLM_DEBUG(lock, "MGC blocking CB");
769 ldlm_lock2handle(lock, &lockh);
770 rc = ldlm_cli_cancel(&lockh, LCF_ASYNC);
771 break;
772 case LDLM_CB_CANCELING:
773 /* We've given up the lock, prepare ourselves to update. */
774 LDLM_DEBUG(lock, "MGC cancel CB");
775
776 CDEBUG(D_MGC, "Lock res "DLDLMRES" (%.8s)\n",
777 PLDLMRES(lock->l_resource),
778 (char *)&lock->l_resource->lr_name.name[0]);
779
780 if (!cld) {
781 CDEBUG(D_INFO, "missing data, won't requeue\n");
782 break;
783 }
784
785 /* held at mgc_process_log(). */
786 LASSERT(atomic_read(&cld->cld_refcount) > 0);
787 /* Are we done with this log? */
788 if (cld->cld_stopping) {
789 CDEBUG(D_MGC, "log %s: stopping, won't requeue\n",
790 cld->cld_logname);
791 config_log_put(cld);
792 break;
793 }
794 /* Make sure not to re-enqueue when the mgc is stopping
795 (we get called from client_disconnect_export) */
796 if (!lock->l_conn_export ||
797 !lock->l_conn_export->exp_obd->u.cli.cl_conn_count) {
798 CDEBUG(D_MGC, "log %.8s: disconnecting, won't requeue\n",
799 cld->cld_logname);
800 config_log_put(cld);
801 break;
802 }
803
804 /* Re-enqueue now */
805 mgc_requeue_add(cld);
806 config_log_put(cld);
807 break;
808 default:
809 LBUG();
810 }
811
812 return rc;
813 }
814
815 /* Not sure where this should go... */
816 /* This is the timeout value for MGS_CONNECT request plus a ping interval, such
817 * that we can have a chance to try the secondary MGS if any. */
818 #define MGC_ENQUEUE_LIMIT (INITIAL_CONNECT_TIMEOUT + (AT_OFF ? 0 : at_min) \
819 + PING_INTERVAL)
820 #define MGC_TARGET_REG_LIMIT 10
821 #define MGC_SEND_PARAM_LIMIT 10
822
823 /* Send parameter to MGS*/
mgc_set_mgs_param(struct obd_export * exp,struct mgs_send_param * msp)824 static int mgc_set_mgs_param(struct obd_export *exp,
825 struct mgs_send_param *msp)
826 {
827 struct ptlrpc_request *req;
828 struct mgs_send_param *req_msp, *rep_msp;
829 int rc;
830
831 req = ptlrpc_request_alloc_pack(class_exp2cliimp(exp),
832 &RQF_MGS_SET_INFO, LUSTRE_MGS_VERSION,
833 MGS_SET_INFO);
834 if (!req)
835 return -ENOMEM;
836
837 req_msp = req_capsule_client_get(&req->rq_pill, &RMF_MGS_SEND_PARAM);
838 if (!req_msp) {
839 ptlrpc_req_finished(req);
840 return -ENOMEM;
841 }
842
843 memcpy(req_msp, msp, sizeof(*req_msp));
844 ptlrpc_request_set_replen(req);
845
846 /* Limit how long we will wait for the enqueue to complete */
847 req->rq_delay_limit = MGC_SEND_PARAM_LIMIT;
848 rc = ptlrpc_queue_wait(req);
849 if (!rc) {
850 rep_msp = req_capsule_server_get(&req->rq_pill, &RMF_MGS_SEND_PARAM);
851 memcpy(msp, rep_msp, sizeof(*rep_msp));
852 }
853
854 ptlrpc_req_finished(req);
855
856 return rc;
857 }
858
859 /* Take a config lock so we can get cancel notifications */
mgc_enqueue(struct obd_export * exp,struct lov_stripe_md * lsm,__u32 type,ldlm_policy_data_t * policy,__u32 mode,__u64 * flags,void * bl_cb,void * cp_cb,void * gl_cb,void * data,__u32 lvb_len,void * lvb_swabber,struct lustre_handle * lockh)860 static int mgc_enqueue(struct obd_export *exp, struct lov_stripe_md *lsm,
861 __u32 type, ldlm_policy_data_t *policy, __u32 mode,
862 __u64 *flags, void *bl_cb, void *cp_cb, void *gl_cb,
863 void *data, __u32 lvb_len, void *lvb_swabber,
864 struct lustre_handle *lockh)
865 {
866 struct config_llog_data *cld = (struct config_llog_data *)data;
867 struct ldlm_enqueue_info einfo = {
868 .ei_type = type,
869 .ei_mode = mode,
870 .ei_cb_bl = mgc_blocking_ast,
871 .ei_cb_cp = ldlm_completion_ast,
872 };
873 struct ptlrpc_request *req;
874 int short_limit = cld_is_sptlrpc(cld);
875 int rc;
876
877 CDEBUG(D_MGC, "Enqueue for %s (res %#llx)\n", cld->cld_logname,
878 cld->cld_resid.name[0]);
879
880 /* We need a callback for every lockholder, so don't try to
881 ldlm_lock_match (see rev 1.1.2.11.2.47) */
882 req = ptlrpc_request_alloc_pack(class_exp2cliimp(exp),
883 &RQF_LDLM_ENQUEUE, LUSTRE_DLM_VERSION,
884 LDLM_ENQUEUE);
885 if (req == NULL)
886 return -ENOMEM;
887
888 req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB, RCL_SERVER, 0);
889 ptlrpc_request_set_replen(req);
890
891 /* check if this is server or client */
892 if (cld->cld_cfg.cfg_sb) {
893 struct lustre_sb_info *lsi = s2lsi(cld->cld_cfg.cfg_sb);
894 if (lsi && IS_SERVER(lsi))
895 short_limit = 1;
896 }
897 /* Limit how long we will wait for the enqueue to complete */
898 req->rq_delay_limit = short_limit ? 5 : MGC_ENQUEUE_LIMIT;
899 rc = ldlm_cli_enqueue(exp, &req, &einfo, &cld->cld_resid, NULL, flags,
900 NULL, 0, LVB_T_NONE, lockh, 0);
901 /* A failed enqueue should still call the mgc_blocking_ast,
902 where it will be requeued if needed ("grant failed"). */
903 ptlrpc_req_finished(req);
904 return rc;
905 }
906
mgc_notify_active(struct obd_device * unused)907 static void mgc_notify_active(struct obd_device *unused)
908 {
909 /* wakeup mgc_requeue_thread to requeue mgc lock */
910 spin_lock(&config_list_lock);
911 rq_state |= RQ_NOW;
912 spin_unlock(&config_list_lock);
913 wake_up(&rq_waitq);
914
915 /* TODO: Help the MGS rebuild nidtbl. -jay */
916 }
917
918 /* Send target_reg message to MGS */
mgc_target_register(struct obd_export * exp,struct mgs_target_info * mti)919 static int mgc_target_register(struct obd_export *exp,
920 struct mgs_target_info *mti)
921 {
922 struct ptlrpc_request *req;
923 struct mgs_target_info *req_mti, *rep_mti;
924 int rc;
925
926 req = ptlrpc_request_alloc_pack(class_exp2cliimp(exp),
927 &RQF_MGS_TARGET_REG, LUSTRE_MGS_VERSION,
928 MGS_TARGET_REG);
929 if (req == NULL)
930 return -ENOMEM;
931
932 req_mti = req_capsule_client_get(&req->rq_pill, &RMF_MGS_TARGET_INFO);
933 if (!req_mti) {
934 ptlrpc_req_finished(req);
935 return -ENOMEM;
936 }
937
938 memcpy(req_mti, mti, sizeof(*req_mti));
939 ptlrpc_request_set_replen(req);
940 CDEBUG(D_MGC, "register %s\n", mti->mti_svname);
941 /* Limit how long we will wait for the enqueue to complete */
942 req->rq_delay_limit = MGC_TARGET_REG_LIMIT;
943
944 rc = ptlrpc_queue_wait(req);
945 if (!rc) {
946 rep_mti = req_capsule_server_get(&req->rq_pill,
947 &RMF_MGS_TARGET_INFO);
948 memcpy(mti, rep_mti, sizeof(*rep_mti));
949 CDEBUG(D_MGC, "register %s got index = %d\n",
950 mti->mti_svname, mti->mti_stripe_index);
951 }
952 ptlrpc_req_finished(req);
953
954 return rc;
955 }
956
mgc_set_info_async(const struct lu_env * env,struct obd_export * exp,u32 keylen,void * key,u32 vallen,void * val,struct ptlrpc_request_set * set)957 int mgc_set_info_async(const struct lu_env *env, struct obd_export *exp,
958 u32 keylen, void *key, u32 vallen,
959 void *val, struct ptlrpc_request_set *set)
960 {
961 int rc = -EINVAL;
962
963 /* Turn off initial_recov after we try all backup servers once */
964 if (KEY_IS(KEY_INIT_RECOV_BACKUP)) {
965 struct obd_import *imp = class_exp2cliimp(exp);
966 int value;
967 if (vallen != sizeof(int))
968 return -EINVAL;
969 value = *(int *)val;
970 CDEBUG(D_MGC, "InitRecov %s %d/d%d:i%d:r%d:or%d:%s\n",
971 imp->imp_obd->obd_name, value,
972 imp->imp_deactive, imp->imp_invalid,
973 imp->imp_replayable, imp->imp_obd->obd_replayable,
974 ptlrpc_import_state_name(imp->imp_state));
975 /* Resurrect if we previously died */
976 if ((imp->imp_state != LUSTRE_IMP_FULL &&
977 imp->imp_state != LUSTRE_IMP_NEW) || value > 1)
978 ptlrpc_reconnect_import(imp);
979 return 0;
980 }
981 if (KEY_IS(KEY_SET_INFO)) {
982 struct mgs_send_param *msp;
983
984 msp = (struct mgs_send_param *)val;
985 rc = mgc_set_mgs_param(exp, msp);
986 return rc;
987 }
988 if (KEY_IS(KEY_MGSSEC)) {
989 struct client_obd *cli = &exp->exp_obd->u.cli;
990 struct sptlrpc_flavor flvr;
991
992 /*
993 * empty string means using current flavor, if which haven't
994 * been set yet, set it as null.
995 *
996 * if flavor has been set previously, check the asking flavor
997 * must match the existing one.
998 */
999 if (vallen == 0) {
1000 if (cli->cl_flvr_mgc.sf_rpc != SPTLRPC_FLVR_INVALID)
1001 return 0;
1002 val = "null";
1003 vallen = 4;
1004 }
1005
1006 rc = sptlrpc_parse_flavor(val, &flvr);
1007 if (rc) {
1008 CERROR("invalid sptlrpc flavor %s to MGS\n",
1009 (char *) val);
1010 return rc;
1011 }
1012
1013 /*
1014 * caller already hold a mutex
1015 */
1016 if (cli->cl_flvr_mgc.sf_rpc == SPTLRPC_FLVR_INVALID) {
1017 cli->cl_flvr_mgc = flvr;
1018 } else if (memcmp(&cli->cl_flvr_mgc, &flvr,
1019 sizeof(flvr)) != 0) {
1020 char str[20];
1021
1022 sptlrpc_flavor2name(&cli->cl_flvr_mgc,
1023 str, sizeof(str));
1024 LCONSOLE_ERROR("asking sptlrpc flavor %s to MGS but "
1025 "currently %s is in use\n",
1026 (char *) val, str);
1027 rc = -EPERM;
1028 }
1029 return rc;
1030 }
1031
1032 return rc;
1033 }
1034
mgc_get_info(const struct lu_env * env,struct obd_export * exp,__u32 keylen,void * key,__u32 * vallen,void * val,struct lov_stripe_md * unused)1035 static int mgc_get_info(const struct lu_env *env, struct obd_export *exp,
1036 __u32 keylen, void *key, __u32 *vallen, void *val,
1037 struct lov_stripe_md *unused)
1038 {
1039 int rc = -EINVAL;
1040
1041 if (KEY_IS(KEY_CONN_DATA)) {
1042 struct obd_import *imp = class_exp2cliimp(exp);
1043 struct obd_connect_data *data = val;
1044
1045 if (*vallen == sizeof(*data)) {
1046 *data = imp->imp_connect_data;
1047 rc = 0;
1048 }
1049 }
1050
1051 return rc;
1052 }
1053
mgc_import_event(struct obd_device * obd,struct obd_import * imp,enum obd_import_event event)1054 static int mgc_import_event(struct obd_device *obd,
1055 struct obd_import *imp,
1056 enum obd_import_event event)
1057 {
1058 int rc = 0;
1059
1060 LASSERT(imp->imp_obd == obd);
1061 CDEBUG(D_MGC, "import event %#x\n", event);
1062
1063 switch (event) {
1064 case IMP_EVENT_DISCON:
1065 /* MGC imports should not wait for recovery */
1066 if (OCD_HAS_FLAG(&imp->imp_connect_data, IMP_RECOV))
1067 ptlrpc_pinger_ir_down();
1068 break;
1069 case IMP_EVENT_INACTIVE:
1070 break;
1071 case IMP_EVENT_INVALIDATE: {
1072 struct ldlm_namespace *ns = obd->obd_namespace;
1073 ldlm_namespace_cleanup(ns, LDLM_FL_LOCAL_ONLY);
1074 break;
1075 }
1076 case IMP_EVENT_ACTIVE:
1077 CDEBUG(D_INFO, "%s: Reactivating import\n", obd->obd_name);
1078 /* Clearing obd_no_recov allows us to continue pinging */
1079 obd->obd_no_recov = 0;
1080 mgc_notify_active(obd);
1081 if (OCD_HAS_FLAG(&imp->imp_connect_data, IMP_RECOV))
1082 ptlrpc_pinger_ir_up();
1083 break;
1084 case IMP_EVENT_OCD:
1085 break;
1086 case IMP_EVENT_DEACTIVATE:
1087 case IMP_EVENT_ACTIVATE:
1088 break;
1089 default:
1090 CERROR("Unknown import event %#x\n", event);
1091 LBUG();
1092 }
1093 return rc;
1094 }
1095
1096 enum {
1097 CONFIG_READ_NRPAGES_INIT = 1 << (20 - PAGE_CACHE_SHIFT),
1098 CONFIG_READ_NRPAGES = 4
1099 };
1100
mgc_apply_recover_logs(struct obd_device * mgc,struct config_llog_data * cld,__u64 max_version,void * data,int datalen,bool mne_swab)1101 static int mgc_apply_recover_logs(struct obd_device *mgc,
1102 struct config_llog_data *cld,
1103 __u64 max_version,
1104 void *data, int datalen, bool mne_swab)
1105 {
1106 struct config_llog_instance *cfg = &cld->cld_cfg;
1107 struct lustre_sb_info *lsi = s2lsi(cfg->cfg_sb);
1108 struct mgs_nidtbl_entry *entry;
1109 struct lustre_cfg *lcfg;
1110 struct lustre_cfg_bufs bufs;
1111 u64 prev_version = 0;
1112 char *inst;
1113 char *buf;
1114 int bufsz;
1115 int pos;
1116 int rc = 0;
1117 int off = 0;
1118
1119 LASSERT(cfg->cfg_instance != NULL);
1120 LASSERT(cfg->cfg_sb == cfg->cfg_instance);
1121
1122 OBD_ALLOC(inst, PAGE_CACHE_SIZE);
1123 if (inst == NULL)
1124 return -ENOMEM;
1125
1126 if (!IS_SERVER(lsi)) {
1127 pos = snprintf(inst, PAGE_CACHE_SIZE, "%p", cfg->cfg_instance);
1128 if (pos >= PAGE_CACHE_SIZE) {
1129 OBD_FREE(inst, PAGE_CACHE_SIZE);
1130 return -E2BIG;
1131 }
1132 } else {
1133 LASSERT(IS_MDT(lsi));
1134 rc = server_name2svname(lsi->lsi_svname, inst, NULL,
1135 PAGE_CACHE_SIZE);
1136 if (rc) {
1137 OBD_FREE(inst, PAGE_CACHE_SIZE);
1138 return -EINVAL;
1139 }
1140 pos = strlen(inst);
1141 }
1142
1143 ++pos;
1144 buf = inst + pos;
1145 bufsz = PAGE_CACHE_SIZE - pos;
1146
1147 while (datalen > 0) {
1148 int entry_len = sizeof(*entry);
1149 int is_ost;
1150 struct obd_device *obd;
1151 char *obdname;
1152 char *cname;
1153 char *params;
1154 char *uuid;
1155
1156 rc = -EINVAL;
1157 if (datalen < sizeof(*entry))
1158 break;
1159
1160 entry = (typeof(entry))(data + off);
1161
1162 /* sanity check */
1163 if (entry->mne_nid_type != 0) /* only support type 0 for ipv4 */
1164 break;
1165 if (entry->mne_nid_count == 0) /* at least one nid entry */
1166 break;
1167 if (entry->mne_nid_size != sizeof(lnet_nid_t))
1168 break;
1169
1170 entry_len += entry->mne_nid_count * entry->mne_nid_size;
1171 if (datalen < entry_len) /* must have entry_len at least */
1172 break;
1173
1174 /* Keep this swab for normal mixed endian handling. LU-1644 */
1175 if (mne_swab)
1176 lustre_swab_mgs_nidtbl_entry(entry);
1177 if (entry->mne_length > PAGE_CACHE_SIZE) {
1178 CERROR("MNE too large (%u)\n", entry->mne_length);
1179 break;
1180 }
1181
1182 if (entry->mne_length < entry_len)
1183 break;
1184
1185 off += entry->mne_length;
1186 datalen -= entry->mne_length;
1187 if (datalen < 0)
1188 break;
1189
1190 if (entry->mne_version > max_version) {
1191 CERROR("entry index(%lld) is over max_index(%lld)\n",
1192 entry->mne_version, max_version);
1193 break;
1194 }
1195
1196 if (prev_version >= entry->mne_version) {
1197 CERROR("index unsorted, prev %lld, now %lld\n",
1198 prev_version, entry->mne_version);
1199 break;
1200 }
1201 prev_version = entry->mne_version;
1202
1203 /*
1204 * Write a string with format "nid::instance" to
1205 * lustre/<osc|mdc>/<target>-<osc|mdc>-<instance>/import.
1206 */
1207
1208 is_ost = entry->mne_type == LDD_F_SV_TYPE_OST;
1209 memset(buf, 0, bufsz);
1210 obdname = buf;
1211 pos = 0;
1212
1213 /* lustre-OST0001-osc-<instance #> */
1214 strcpy(obdname, cld->cld_logname);
1215 cname = strrchr(obdname, '-');
1216 if (cname == NULL) {
1217 CERROR("mgc %s: invalid logname %s\n",
1218 mgc->obd_name, obdname);
1219 break;
1220 }
1221
1222 pos = cname - obdname;
1223 obdname[pos] = 0;
1224 pos += sprintf(obdname + pos, "-%s%04x",
1225 is_ost ? "OST" : "MDT", entry->mne_index);
1226
1227 cname = is_ost ? "osc" : "mdc",
1228 pos += sprintf(obdname + pos, "-%s-%s", cname, inst);
1229 lustre_cfg_bufs_reset(&bufs, obdname);
1230
1231 /* find the obd by obdname */
1232 obd = class_name2obd(obdname);
1233 if (obd == NULL) {
1234 CDEBUG(D_INFO, "mgc %s: cannot find obdname %s\n",
1235 mgc->obd_name, obdname);
1236 rc = 0;
1237 /* this is a safe race, when the ost is starting up...*/
1238 continue;
1239 }
1240
1241 /* osc.import = "connection=<Conn UUID>::<target instance>" */
1242 ++pos;
1243 params = buf + pos;
1244 pos += sprintf(params, "%s.import=%s", cname, "connection=");
1245 uuid = buf + pos;
1246
1247 down_read(&obd->u.cli.cl_sem);
1248 if (obd->u.cli.cl_import == NULL) {
1249 /* client does not connect to the OST yet */
1250 up_read(&obd->u.cli.cl_sem);
1251 rc = 0;
1252 continue;
1253 }
1254
1255 /* TODO: iterate all nids to find one */
1256 /* find uuid by nid */
1257 rc = client_import_find_conn(obd->u.cli.cl_import,
1258 entry->u.nids[0],
1259 (struct obd_uuid *)uuid);
1260 up_read(&obd->u.cli.cl_sem);
1261 if (rc < 0) {
1262 CERROR("mgc: cannot find uuid by nid %s\n",
1263 libcfs_nid2str(entry->u.nids[0]));
1264 break;
1265 }
1266
1267 CDEBUG(D_INFO, "Find uuid %s by nid %s\n",
1268 uuid, libcfs_nid2str(entry->u.nids[0]));
1269
1270 pos += strlen(uuid);
1271 pos += sprintf(buf + pos, "::%u", entry->mne_instance);
1272 LASSERT(pos < bufsz);
1273
1274 lustre_cfg_bufs_set_string(&bufs, 1, params);
1275
1276 rc = -ENOMEM;
1277 lcfg = lustre_cfg_new(LCFG_PARAM, &bufs);
1278 if (lcfg == NULL) {
1279 CERROR("mgc: cannot allocate memory\n");
1280 break;
1281 }
1282
1283 CDEBUG(D_INFO, "ir apply logs %lld/%lld for %s -> %s\n",
1284 prev_version, max_version, obdname, params);
1285
1286 rc = class_process_config(lcfg);
1287 lustre_cfg_free(lcfg);
1288 if (rc)
1289 CDEBUG(D_INFO, "process config for %s error %d\n",
1290 obdname, rc);
1291
1292 /* continue, even one with error */
1293 }
1294
1295 OBD_FREE(inst, PAGE_CACHE_SIZE);
1296 return rc;
1297 }
1298
1299 /**
1300 * This function is called if this client was notified for target restarting
1301 * by the MGS. A CONFIG_READ RPC is going to send to fetch recovery logs.
1302 */
mgc_process_recover_log(struct obd_device * obd,struct config_llog_data * cld)1303 static int mgc_process_recover_log(struct obd_device *obd,
1304 struct config_llog_data *cld)
1305 {
1306 struct ptlrpc_request *req = NULL;
1307 struct config_llog_instance *cfg = &cld->cld_cfg;
1308 struct mgs_config_body *body;
1309 struct mgs_config_res *res;
1310 struct ptlrpc_bulk_desc *desc;
1311 struct page **pages;
1312 int nrpages;
1313 bool eof = true;
1314 bool mne_swab = false;
1315 int i;
1316 int ealen;
1317 int rc;
1318
1319 /* allocate buffer for bulk transfer.
1320 * if this is the first time for this mgs to read logs,
1321 * CONFIG_READ_NRPAGES_INIT will be used since it will read all logs
1322 * once; otherwise, it only reads increment of logs, this should be
1323 * small and CONFIG_READ_NRPAGES will be used.
1324 */
1325 nrpages = CONFIG_READ_NRPAGES;
1326 if (cfg->cfg_last_idx == 0) /* the first time */
1327 nrpages = CONFIG_READ_NRPAGES_INIT;
1328
1329 OBD_ALLOC(pages, sizeof(*pages) * nrpages);
1330 if (pages == NULL) {
1331 rc = -ENOMEM;
1332 goto out;
1333 }
1334
1335 for (i = 0; i < nrpages; i++) {
1336 pages[i] = alloc_page(GFP_IOFS);
1337 if (pages[i] == NULL) {
1338 rc = -ENOMEM;
1339 goto out;
1340 }
1341 }
1342
1343 again:
1344 LASSERT(cld_is_recover(cld));
1345 LASSERT(mutex_is_locked(&cld->cld_lock));
1346 req = ptlrpc_request_alloc(class_exp2cliimp(cld->cld_mgcexp),
1347 &RQF_MGS_CONFIG_READ);
1348 if (req == NULL) {
1349 rc = -ENOMEM;
1350 goto out;
1351 }
1352
1353 rc = ptlrpc_request_pack(req, LUSTRE_MGS_VERSION, MGS_CONFIG_READ);
1354 if (rc)
1355 goto out;
1356
1357 /* pack request */
1358 body = req_capsule_client_get(&req->rq_pill, &RMF_MGS_CONFIG_BODY);
1359 LASSERT(body != NULL);
1360 LASSERT(sizeof(body->mcb_name) > strlen(cld->cld_logname));
1361 if (strlcpy(body->mcb_name, cld->cld_logname, sizeof(body->mcb_name))
1362 >= sizeof(body->mcb_name)) {
1363 rc = -E2BIG;
1364 goto out;
1365 }
1366 body->mcb_offset = cfg->cfg_last_idx + 1;
1367 body->mcb_type = cld->cld_type;
1368 body->mcb_bits = PAGE_CACHE_SHIFT;
1369 body->mcb_units = nrpages;
1370
1371 /* allocate bulk transfer descriptor */
1372 desc = ptlrpc_prep_bulk_imp(req, nrpages, 1, BULK_PUT_SINK,
1373 MGS_BULK_PORTAL);
1374 if (desc == NULL) {
1375 rc = -ENOMEM;
1376 goto out;
1377 }
1378
1379 for (i = 0; i < nrpages; i++)
1380 ptlrpc_prep_bulk_page_pin(desc, pages[i], 0, PAGE_CACHE_SIZE);
1381
1382 ptlrpc_request_set_replen(req);
1383 rc = ptlrpc_queue_wait(req);
1384 if (rc)
1385 goto out;
1386
1387 res = req_capsule_server_get(&req->rq_pill, &RMF_MGS_CONFIG_RES);
1388 if (res->mcr_size < res->mcr_offset) {
1389 rc = -EINVAL;
1390 goto out;
1391 }
1392
1393 /* always update the index even though it might have errors with
1394 * handling the recover logs */
1395 cfg->cfg_last_idx = res->mcr_offset;
1396 eof = res->mcr_offset == res->mcr_size;
1397
1398 CDEBUG(D_INFO, "Latest version %lld, more %d.\n",
1399 res->mcr_offset, eof == false);
1400
1401 ealen = sptlrpc_cli_unwrap_bulk_read(req, req->rq_bulk, 0);
1402 if (ealen < 0) {
1403 rc = ealen;
1404 goto out;
1405 }
1406
1407 if (ealen > nrpages << PAGE_CACHE_SHIFT) {
1408 rc = -EINVAL;
1409 goto out;
1410 }
1411
1412 if (ealen == 0) { /* no logs transferred */
1413 if (!eof)
1414 rc = -EINVAL;
1415 goto out;
1416 }
1417
1418 mne_swab = !!ptlrpc_rep_need_swab(req);
1419 #if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(3, 2, 50, 0)
1420 /* This import flag means the server did an extra swab of IR MNE
1421 * records (fixed in LU-1252), reverse it here if needed. LU-1644 */
1422 if (unlikely(req->rq_import->imp_need_mne_swab))
1423 mne_swab = !mne_swab;
1424 #else
1425 #warning "LU-1644: Remove old OBD_CONNECT_MNE_SWAB fixup and imp_need_mne_swab"
1426 #endif
1427
1428 for (i = 0; i < nrpages && ealen > 0; i++) {
1429 int rc2;
1430 void *ptr;
1431
1432 ptr = kmap(pages[i]);
1433 rc2 = mgc_apply_recover_logs(obd, cld, res->mcr_offset, ptr,
1434 min_t(int, ealen, PAGE_CACHE_SIZE),
1435 mne_swab);
1436 kunmap(pages[i]);
1437 if (rc2 < 0) {
1438 CWARN("Process recover log %s error %d\n",
1439 cld->cld_logname, rc2);
1440 break;
1441 }
1442
1443 ealen -= PAGE_CACHE_SIZE;
1444 }
1445
1446 out:
1447 if (req)
1448 ptlrpc_req_finished(req);
1449
1450 if (rc == 0 && !eof)
1451 goto again;
1452
1453 if (pages) {
1454 for (i = 0; i < nrpages; i++) {
1455 if (pages[i] == NULL)
1456 break;
1457 __free_page(pages[i]);
1458 }
1459 OBD_FREE(pages, sizeof(*pages) * nrpages);
1460 }
1461 return rc;
1462 }
1463
1464 /* local_only means it cannot get remote llogs */
mgc_process_cfg_log(struct obd_device * mgc,struct config_llog_data * cld,int local_only)1465 static int mgc_process_cfg_log(struct obd_device *mgc,
1466 struct config_llog_data *cld, int local_only)
1467 {
1468 struct llog_ctxt *ctxt;
1469 struct lustre_sb_info *lsi = NULL;
1470 int rc = 0;
1471 bool sptlrpc_started = false;
1472 struct lu_env *env;
1473
1474 LASSERT(cld);
1475 LASSERT(mutex_is_locked(&cld->cld_lock));
1476
1477 /*
1478 * local copy of sptlrpc log is controlled elsewhere, don't try to
1479 * read it up here.
1480 */
1481 if (cld_is_sptlrpc(cld) && local_only)
1482 return 0;
1483
1484 if (cld->cld_cfg.cfg_sb)
1485 lsi = s2lsi(cld->cld_cfg.cfg_sb);
1486
1487 OBD_ALLOC_PTR(env);
1488 if (env == NULL)
1489 return -ENOMEM;
1490
1491 rc = lu_env_init(env, LCT_MG_THREAD);
1492 if (rc)
1493 goto out_free;
1494
1495 ctxt = llog_get_context(mgc, LLOG_CONFIG_REPL_CTXT);
1496 LASSERT(ctxt);
1497
1498 if (local_only) /* no local log at client side */ {
1499 rc = -EIO;
1500 goto out_pop;
1501 }
1502
1503 if (cld_is_sptlrpc(cld)) {
1504 sptlrpc_conf_log_update_begin(cld->cld_logname);
1505 sptlrpc_started = true;
1506 }
1507
1508 /* logname and instance info should be the same, so use our
1509 * copy of the instance for the update. The cfg_last_idx will
1510 * be updated here. */
1511 rc = class_config_parse_llog(env, ctxt, cld->cld_logname,
1512 &cld->cld_cfg);
1513
1514 out_pop:
1515 __llog_ctxt_put(env, ctxt);
1516
1517 /*
1518 * update settings on existing OBDs. doing it inside
1519 * of llog_process_lock so no device is attaching/detaching
1520 * in parallel.
1521 * the logname must be <fsname>-sptlrpc
1522 */
1523 if (sptlrpc_started) {
1524 LASSERT(cld_is_sptlrpc(cld));
1525 sptlrpc_conf_log_update_end(cld->cld_logname);
1526 class_notify_sptlrpc_conf(cld->cld_logname,
1527 strlen(cld->cld_logname) -
1528 strlen("-sptlrpc"));
1529 }
1530
1531 lu_env_fini(env);
1532 out_free:
1533 OBD_FREE_PTR(env);
1534 return rc;
1535 }
1536
1537 /** Get a config log from the MGS and process it.
1538 * This func is called for both clients and servers.
1539 * Copy the log locally before parsing it if appropriate (non-MGS server)
1540 */
mgc_process_log(struct obd_device * mgc,struct config_llog_data * cld)1541 int mgc_process_log(struct obd_device *mgc, struct config_llog_data *cld)
1542 {
1543 struct lustre_handle lockh = { 0 };
1544 __u64 flags = LDLM_FL_NO_LRU;
1545 int rc = 0, rcl;
1546
1547 LASSERT(cld);
1548
1549 /* I don't want multiple processes running process_log at once --
1550 sounds like badness. It actually might be fine, as long as
1551 we're not trying to update from the same log
1552 simultaneously (in which case we should use a per-log sem.) */
1553 mutex_lock(&cld->cld_lock);
1554 if (cld->cld_stopping) {
1555 mutex_unlock(&cld->cld_lock);
1556 return 0;
1557 }
1558
1559 OBD_FAIL_TIMEOUT(OBD_FAIL_MGC_PAUSE_PROCESS_LOG, 20);
1560
1561 CDEBUG(D_MGC, "Process log %s:%p from %d\n", cld->cld_logname,
1562 cld->cld_cfg.cfg_instance, cld->cld_cfg.cfg_last_idx + 1);
1563
1564 /* Get the cfg lock on the llog */
1565 rcl = mgc_enqueue(mgc->u.cli.cl_mgc_mgsexp, NULL, LDLM_PLAIN, NULL,
1566 LCK_CR, &flags, NULL, NULL, NULL,
1567 cld, 0, NULL, &lockh);
1568 if (rcl == 0) {
1569 /* Get the cld, it will be released in mgc_blocking_ast. */
1570 config_log_get(cld);
1571 rc = ldlm_lock_set_data(&lockh, (void *)cld);
1572 LASSERT(rc == 0);
1573 } else {
1574 CDEBUG(D_MGC, "Can't get cfg lock: %d\n", rcl);
1575
1576 /* mark cld_lostlock so that it will requeue
1577 * after MGC becomes available. */
1578 cld->cld_lostlock = 1;
1579 /* Get extra reference, it will be put in requeue thread */
1580 config_log_get(cld);
1581 }
1582
1583
1584 if (cld_is_recover(cld)) {
1585 rc = 0; /* this is not a fatal error for recover log */
1586 if (rcl == 0)
1587 rc = mgc_process_recover_log(mgc, cld);
1588 } else {
1589 rc = mgc_process_cfg_log(mgc, cld, rcl != 0);
1590 }
1591
1592 CDEBUG(D_MGC, "%s: configuration from log '%s' %sed (%d).\n",
1593 mgc->obd_name, cld->cld_logname, rc ? "fail" : "succeed", rc);
1594
1595 mutex_unlock(&cld->cld_lock);
1596
1597 /* Now drop the lock so MGS can revoke it */
1598 if (!rcl)
1599 ldlm_lock_decref(&lockh, LCK_CR);
1600
1601 return rc;
1602 }
1603
1604
1605 /** Called from lustre_process_log.
1606 * LCFG_LOG_START gets the config log from the MGS, processes it to start
1607 * any services, and adds it to the list logs to watch (follow).
1608 */
mgc_process_config(struct obd_device * obd,u32 len,void * buf)1609 static int mgc_process_config(struct obd_device *obd, u32 len, void *buf)
1610 {
1611 struct lustre_cfg *lcfg = buf;
1612 struct config_llog_instance *cfg = NULL;
1613 char *logname;
1614 int rc = 0;
1615
1616 switch (lcfg->lcfg_command) {
1617 case LCFG_LOV_ADD_OBD: {
1618 /* Overloading this cfg command: register a new target */
1619 struct mgs_target_info *mti;
1620
1621 if (LUSTRE_CFG_BUFLEN(lcfg, 1) !=
1622 sizeof(struct mgs_target_info)) {
1623 rc = -EINVAL;
1624 goto out;
1625 }
1626
1627 mti = (struct mgs_target_info *)lustre_cfg_buf(lcfg, 1);
1628 CDEBUG(D_MGC, "add_target %s %#x\n",
1629 mti->mti_svname, mti->mti_flags);
1630 rc = mgc_target_register(obd->u.cli.cl_mgc_mgsexp, mti);
1631 break;
1632 }
1633 case LCFG_LOV_DEL_OBD:
1634 /* Unregister has no meaning at the moment. */
1635 CERROR("lov_del_obd unimplemented\n");
1636 rc = -ENOSYS;
1637 break;
1638 case LCFG_SPTLRPC_CONF: {
1639 rc = sptlrpc_process_config(lcfg);
1640 break;
1641 }
1642 case LCFG_LOG_START: {
1643 struct config_llog_data *cld;
1644 struct super_block *sb;
1645
1646 logname = lustre_cfg_string(lcfg, 1);
1647 cfg = (struct config_llog_instance *)lustre_cfg_buf(lcfg, 2);
1648 sb = *(struct super_block **)lustre_cfg_buf(lcfg, 3);
1649
1650 CDEBUG(D_MGC, "parse_log %s from %d\n", logname,
1651 cfg->cfg_last_idx);
1652
1653 /* We're only called through here on the initial mount */
1654 rc = config_log_add(obd, logname, cfg, sb);
1655 if (rc)
1656 break;
1657 cld = config_log_find(logname, cfg);
1658 if (cld == NULL) {
1659 rc = -ENOENT;
1660 break;
1661 }
1662
1663 /* COMPAT_146 */
1664 /* FIXME only set this for old logs! Right now this forces
1665 us to always skip the "inside markers" check */
1666 cld->cld_cfg.cfg_flags |= CFG_F_COMPAT146;
1667
1668 rc = mgc_process_log(obd, cld);
1669 if (rc == 0 && cld->cld_recover != NULL) {
1670 if (OCD_HAS_FLAG(&obd->u.cli.cl_import->
1671 imp_connect_data, IMP_RECOV)) {
1672 rc = mgc_process_log(obd, cld->cld_recover);
1673 } else {
1674 struct config_llog_data *cir = cld->cld_recover;
1675 cld->cld_recover = NULL;
1676 config_log_put(cir);
1677 }
1678 if (rc)
1679 CERROR("Cannot process recover llog %d\n", rc);
1680 }
1681
1682 if (rc == 0 && cld->cld_params != NULL) {
1683 rc = mgc_process_log(obd, cld->cld_params);
1684 if (rc == -ENOENT) {
1685 CDEBUG(D_MGC,
1686 "There is no params config file yet\n");
1687 rc = 0;
1688 }
1689 /* params log is optional */
1690 if (rc)
1691 CERROR(
1692 "%s: can't process params llog: rc = %d\n",
1693 obd->obd_name, rc);
1694 }
1695 config_log_put(cld);
1696
1697 break;
1698 }
1699 case LCFG_LOG_END: {
1700 logname = lustre_cfg_string(lcfg, 1);
1701
1702 if (lcfg->lcfg_bufcount >= 2)
1703 cfg = (struct config_llog_instance *)lustre_cfg_buf(
1704 lcfg, 2);
1705 rc = config_log_end(logname, cfg);
1706 break;
1707 }
1708 default: {
1709 CERROR("Unknown command: %d\n", lcfg->lcfg_command);
1710 rc = -EINVAL;
1711 goto out;
1712
1713 }
1714 }
1715 out:
1716 return rc;
1717 }
1718
1719 struct obd_ops mgc_obd_ops = {
1720 .o_owner = THIS_MODULE,
1721 .o_setup = mgc_setup,
1722 .o_precleanup = mgc_precleanup,
1723 .o_cleanup = mgc_cleanup,
1724 .o_add_conn = client_import_add_conn,
1725 .o_del_conn = client_import_del_conn,
1726 .o_connect = client_connect_import,
1727 .o_disconnect = client_disconnect_export,
1728 /* .o_enqueue = mgc_enqueue, */
1729 /* .o_iocontrol = mgc_iocontrol, */
1730 .o_set_info_async = mgc_set_info_async,
1731 .o_get_info = mgc_get_info,
1732 .o_import_event = mgc_import_event,
1733 .o_process_config = mgc_process_config,
1734 };
1735
mgc_init(void)1736 int __init mgc_init(void)
1737 {
1738 return class_register_type(&mgc_obd_ops, NULL, NULL,
1739 LUSTRE_MGC_NAME, NULL);
1740 }
1741
mgc_exit(void)1742 static void /*__exit*/ mgc_exit(void)
1743 {
1744 class_unregister_type(LUSTRE_MGC_NAME);
1745 }
1746
1747 MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
1748 MODULE_DESCRIPTION("Lustre Management Client");
1749 MODULE_LICENSE("GPL");
1750
1751 module_init(mgc_init);
1752 module_exit(mgc_exit);
1753