1 /* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
3 *
4 * dlmlock.c
5 *
6 * underlying calls for lock creation
7 *
8 * Copyright (C) 2004 Oracle. All rights reserved.
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public
12 * License as published by the Free Software Foundation; either
13 * version 2 of the License, or (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public
21 * License along with this program; if not, write to the
22 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
23 * Boston, MA 021110-1307, USA.
24 *
25 */
26
27
28 #include <linux/module.h>
29 #include <linux/fs.h>
30 #include <linux/types.h>
31 #include <linux/slab.h>
32 #include <linux/highmem.h>
33 #include <linux/init.h>
34 #include <linux/sysctl.h>
35 #include <linux/random.h>
36 #include <linux/blkdev.h>
37 #include <linux/socket.h>
38 #include <linux/inet.h>
39 #include <linux/spinlock.h>
40 #include <linux/delay.h>
41
42
43 #include "cluster/heartbeat.h"
44 #include "cluster/nodemanager.h"
45 #include "cluster/tcp.h"
46
47 #include "dlmapi.h"
48 #include "dlmcommon.h"
49
50 #include "dlmconvert.h"
51
52 #define MLOG_MASK_PREFIX ML_DLM
53 #include "cluster/masklog.h"
54
55 static struct kmem_cache *dlm_lock_cache = NULL;
56
57 static DEFINE_SPINLOCK(dlm_cookie_lock);
58 static u64 dlm_next_cookie = 1;
59
60 static enum dlm_status dlm_send_remote_lock_request(struct dlm_ctxt *dlm,
61 struct dlm_lock_resource *res,
62 struct dlm_lock *lock, int flags);
63 static void dlm_init_lock(struct dlm_lock *newlock, int type,
64 u8 node, u64 cookie);
65 static void dlm_lock_release(struct kref *kref);
66 static void dlm_lock_detach_lockres(struct dlm_lock *lock);
67
dlm_init_lock_cache(void)68 int dlm_init_lock_cache(void)
69 {
70 dlm_lock_cache = kmem_cache_create("o2dlm_lock",
71 sizeof(struct dlm_lock),
72 0, SLAB_HWCACHE_ALIGN, NULL);
73 if (dlm_lock_cache == NULL)
74 return -ENOMEM;
75 return 0;
76 }
77
dlm_destroy_lock_cache(void)78 void dlm_destroy_lock_cache(void)
79 {
80 if (dlm_lock_cache)
81 kmem_cache_destroy(dlm_lock_cache);
82 }
83
84 /* Tell us whether we can grant a new lock request.
85 * locking:
86 * caller needs: res->spinlock
87 * taken: none
88 * held on exit: none
89 * returns: 1 if the lock can be granted, 0 otherwise.
90 */
dlm_can_grant_new_lock(struct dlm_lock_resource * res,struct dlm_lock * lock)91 static int dlm_can_grant_new_lock(struct dlm_lock_resource *res,
92 struct dlm_lock *lock)
93 {
94 struct list_head *iter;
95 struct dlm_lock *tmplock;
96
97 list_for_each(iter, &res->granted) {
98 tmplock = list_entry(iter, struct dlm_lock, list);
99
100 if (!dlm_lock_compatible(tmplock->ml.type, lock->ml.type))
101 return 0;
102 }
103
104 list_for_each(iter, &res->converting) {
105 tmplock = list_entry(iter, struct dlm_lock, list);
106
107 if (!dlm_lock_compatible(tmplock->ml.type, lock->ml.type))
108 return 0;
109 if (!dlm_lock_compatible(tmplock->ml.convert_type,
110 lock->ml.type))
111 return 0;
112 }
113
114 return 1;
115 }
116
117 /* performs lock creation at the lockres master site
118 * locking:
119 * caller needs: none
120 * taken: takes and drops res->spinlock
121 * held on exit: none
122 * returns: DLM_NORMAL, DLM_NOTQUEUED
123 */
dlmlock_master(struct dlm_ctxt * dlm,struct dlm_lock_resource * res,struct dlm_lock * lock,int flags)124 static enum dlm_status dlmlock_master(struct dlm_ctxt *dlm,
125 struct dlm_lock_resource *res,
126 struct dlm_lock *lock, int flags)
127 {
128 int call_ast = 0, kick_thread = 0;
129 enum dlm_status status = DLM_NORMAL;
130
131 mlog(0, "type=%d\n", lock->ml.type);
132
133 spin_lock(&res->spinlock);
134 /* if called from dlm_create_lock_handler, need to
135 * ensure it will not sleep in dlm_wait_on_lockres */
136 status = __dlm_lockres_state_to_status(res);
137 if (status != DLM_NORMAL &&
138 lock->ml.node != dlm->node_num) {
139 /* erf. state changed after lock was dropped. */
140 spin_unlock(&res->spinlock);
141 dlm_error(status);
142 return status;
143 }
144 __dlm_wait_on_lockres(res);
145 __dlm_lockres_reserve_ast(res);
146
147 if (dlm_can_grant_new_lock(res, lock)) {
148 mlog(0, "I can grant this lock right away\n");
149 /* got it right away */
150 lock->lksb->status = DLM_NORMAL;
151 status = DLM_NORMAL;
152 dlm_lock_get(lock);
153 list_add_tail(&lock->list, &res->granted);
154
155 /* for the recovery lock, we can't allow the ast
156 * to be queued since the dlmthread is already
157 * frozen. but the recovery lock is always locked
158 * with LKM_NOQUEUE so we do not need the ast in
159 * this special case */
160 if (!dlm_is_recovery_lock(res->lockname.name,
161 res->lockname.len)) {
162 kick_thread = 1;
163 call_ast = 1;
164 } else {
165 mlog(0, "%s: returning DLM_NORMAL to "
166 "node %u for reco lock\n", dlm->name,
167 lock->ml.node);
168 }
169 } else {
170 /* for NOQUEUE request, unless we get the
171 * lock right away, return DLM_NOTQUEUED */
172 if (flags & LKM_NOQUEUE) {
173 status = DLM_NOTQUEUED;
174 if (dlm_is_recovery_lock(res->lockname.name,
175 res->lockname.len)) {
176 mlog(0, "%s: returning NOTQUEUED to "
177 "node %u for reco lock\n", dlm->name,
178 lock->ml.node);
179 }
180 } else {
181 dlm_lock_get(lock);
182 list_add_tail(&lock->list, &res->blocked);
183 kick_thread = 1;
184 }
185 }
186
187 spin_unlock(&res->spinlock);
188 wake_up(&res->wq);
189
190 /* either queue the ast or release it */
191 if (call_ast)
192 dlm_queue_ast(dlm, lock);
193 else
194 dlm_lockres_release_ast(dlm, res);
195
196 dlm_lockres_calc_usage(dlm, res);
197 if (kick_thread)
198 dlm_kick_thread(dlm, res);
199
200 return status;
201 }
202
dlm_revert_pending_lock(struct dlm_lock_resource * res,struct dlm_lock * lock)203 void dlm_revert_pending_lock(struct dlm_lock_resource *res,
204 struct dlm_lock *lock)
205 {
206 /* remove from local queue if it failed */
207 list_del_init(&lock->list);
208 lock->lksb->flags &= ~DLM_LKSB_GET_LVB;
209 }
210
211
212 /*
213 * locking:
214 * caller needs: none
215 * taken: takes and drops res->spinlock
216 * held on exit: none
217 * returns: DLM_DENIED, DLM_RECOVERING, or net status
218 */
dlmlock_remote(struct dlm_ctxt * dlm,struct dlm_lock_resource * res,struct dlm_lock * lock,int flags)219 static enum dlm_status dlmlock_remote(struct dlm_ctxt *dlm,
220 struct dlm_lock_resource *res,
221 struct dlm_lock *lock, int flags)
222 {
223 enum dlm_status status = DLM_DENIED;
224 int lockres_changed = 1;
225
226 mlog(0, "type=%d, lockres %.*s, flags = 0x%x\n",
227 lock->ml.type, res->lockname.len,
228 res->lockname.name, flags);
229
230 /*
231 * Wait if resource is getting recovered, remastered, etc.
232 * If the resource was remastered and new owner is self, then exit.
233 */
234 spin_lock(&res->spinlock);
235 __dlm_wait_on_lockres(res);
236 if (res->owner == dlm->node_num) {
237 spin_unlock(&res->spinlock);
238 return DLM_RECOVERING;
239 }
240 res->state |= DLM_LOCK_RES_IN_PROGRESS;
241
242 /* add lock to local (secondary) queue */
243 dlm_lock_get(lock);
244 list_add_tail(&lock->list, &res->blocked);
245 lock->lock_pending = 1;
246 spin_unlock(&res->spinlock);
247
248 /* spec seems to say that you will get DLM_NORMAL when the lock
249 * has been queued, meaning we need to wait for a reply here. */
250 status = dlm_send_remote_lock_request(dlm, res, lock, flags);
251
252 spin_lock(&res->spinlock);
253 res->state &= ~DLM_LOCK_RES_IN_PROGRESS;
254 lock->lock_pending = 0;
255 if (status != DLM_NORMAL) {
256 if (status == DLM_RECOVERING &&
257 dlm_is_recovery_lock(res->lockname.name,
258 res->lockname.len)) {
259 /* recovery lock was mastered by dead node.
260 * we need to have calc_usage shoot down this
261 * lockres and completely remaster it. */
262 mlog(0, "%s: recovery lock was owned by "
263 "dead node %u, remaster it now.\n",
264 dlm->name, res->owner);
265 } else if (status != DLM_NOTQUEUED) {
266 /*
267 * DO NOT call calc_usage, as this would unhash
268 * the remote lockres before we ever get to use
269 * it. treat as if we never made any change to
270 * the lockres.
271 */
272 lockres_changed = 0;
273 dlm_error(status);
274 }
275 dlm_revert_pending_lock(res, lock);
276 dlm_lock_put(lock);
277 } else if (dlm_is_recovery_lock(res->lockname.name,
278 res->lockname.len)) {
279 /* special case for the $RECOVERY lock.
280 * there will never be an AST delivered to put
281 * this lock on the proper secondary queue
282 * (granted), so do it manually. */
283 mlog(0, "%s: $RECOVERY lock for this node (%u) is "
284 "mastered by %u; got lock, manually granting (no ast)\n",
285 dlm->name, dlm->node_num, res->owner);
286 list_move_tail(&lock->list, &res->granted);
287 }
288 spin_unlock(&res->spinlock);
289
290 if (lockres_changed)
291 dlm_lockres_calc_usage(dlm, res);
292
293 wake_up(&res->wq);
294 return status;
295 }
296
297
298 /* for remote lock creation.
299 * locking:
300 * caller needs: none, but need res->state & DLM_LOCK_RES_IN_PROGRESS
301 * taken: none
302 * held on exit: none
303 * returns: DLM_NOLOCKMGR, or net status
304 */
dlm_send_remote_lock_request(struct dlm_ctxt * dlm,struct dlm_lock_resource * res,struct dlm_lock * lock,int flags)305 static enum dlm_status dlm_send_remote_lock_request(struct dlm_ctxt *dlm,
306 struct dlm_lock_resource *res,
307 struct dlm_lock *lock, int flags)
308 {
309 struct dlm_create_lock create;
310 int tmpret, status = 0;
311 enum dlm_status ret;
312
313 memset(&create, 0, sizeof(create));
314 create.node_idx = dlm->node_num;
315 create.requested_type = lock->ml.type;
316 create.cookie = lock->ml.cookie;
317 create.namelen = res->lockname.len;
318 create.flags = cpu_to_be32(flags);
319 memcpy(create.name, res->lockname.name, create.namelen);
320
321 tmpret = o2net_send_message(DLM_CREATE_LOCK_MSG, dlm->key, &create,
322 sizeof(create), res->owner, &status);
323 if (tmpret >= 0) {
324 ret = status;
325 if (ret == DLM_REJECTED) {
326 mlog(ML_ERROR, "%s: res %.*s, Stale lockres no longer "
327 "owned by node %u. That node is coming back up "
328 "currently.\n", dlm->name, create.namelen,
329 create.name, res->owner);
330 dlm_print_one_lock_resource(res);
331 BUG();
332 }
333 } else {
334 mlog(ML_ERROR, "%s: res %.*s, Error %d send CREATE LOCK to "
335 "node %u\n", dlm->name, create.namelen, create.name,
336 tmpret, res->owner);
337 if (dlm_is_host_down(tmpret))
338 ret = DLM_RECOVERING;
339 else
340 ret = dlm_err_to_dlm_status(tmpret);
341 }
342
343 return ret;
344 }
345
dlm_lock_get(struct dlm_lock * lock)346 void dlm_lock_get(struct dlm_lock *lock)
347 {
348 kref_get(&lock->lock_refs);
349 }
350
dlm_lock_put(struct dlm_lock * lock)351 void dlm_lock_put(struct dlm_lock *lock)
352 {
353 kref_put(&lock->lock_refs, dlm_lock_release);
354 }
355
dlm_lock_release(struct kref * kref)356 static void dlm_lock_release(struct kref *kref)
357 {
358 struct dlm_lock *lock;
359
360 lock = container_of(kref, struct dlm_lock, lock_refs);
361
362 BUG_ON(!list_empty(&lock->list));
363 BUG_ON(!list_empty(&lock->ast_list));
364 BUG_ON(!list_empty(&lock->bast_list));
365 BUG_ON(lock->ast_pending);
366 BUG_ON(lock->bast_pending);
367
368 dlm_lock_detach_lockres(lock);
369
370 if (lock->lksb_kernel_allocated) {
371 mlog(0, "freeing kernel-allocated lksb\n");
372 kfree(lock->lksb);
373 }
374 kmem_cache_free(dlm_lock_cache, lock);
375 }
376
377 /* associate a lock with it's lockres, getting a ref on the lockres */
dlm_lock_attach_lockres(struct dlm_lock * lock,struct dlm_lock_resource * res)378 void dlm_lock_attach_lockres(struct dlm_lock *lock,
379 struct dlm_lock_resource *res)
380 {
381 dlm_lockres_get(res);
382 lock->lockres = res;
383 }
384
385 /* drop ref on lockres, if there is still one associated with lock */
dlm_lock_detach_lockres(struct dlm_lock * lock)386 static void dlm_lock_detach_lockres(struct dlm_lock *lock)
387 {
388 struct dlm_lock_resource *res;
389
390 res = lock->lockres;
391 if (res) {
392 lock->lockres = NULL;
393 mlog(0, "removing lock's lockres reference\n");
394 dlm_lockres_put(res);
395 }
396 }
397
dlm_init_lock(struct dlm_lock * newlock,int type,u8 node,u64 cookie)398 static void dlm_init_lock(struct dlm_lock *newlock, int type,
399 u8 node, u64 cookie)
400 {
401 INIT_LIST_HEAD(&newlock->list);
402 INIT_LIST_HEAD(&newlock->ast_list);
403 INIT_LIST_HEAD(&newlock->bast_list);
404 spin_lock_init(&newlock->spinlock);
405 newlock->ml.type = type;
406 newlock->ml.convert_type = LKM_IVMODE;
407 newlock->ml.highest_blocked = LKM_IVMODE;
408 newlock->ml.node = node;
409 newlock->ml.pad1 = 0;
410 newlock->ml.list = 0;
411 newlock->ml.flags = 0;
412 newlock->ast = NULL;
413 newlock->bast = NULL;
414 newlock->astdata = NULL;
415 newlock->ml.cookie = cpu_to_be64(cookie);
416 newlock->ast_pending = 0;
417 newlock->bast_pending = 0;
418 newlock->convert_pending = 0;
419 newlock->lock_pending = 0;
420 newlock->unlock_pending = 0;
421 newlock->cancel_pending = 0;
422 newlock->lksb_kernel_allocated = 0;
423
424 kref_init(&newlock->lock_refs);
425 }
426
dlm_new_lock(int type,u8 node,u64 cookie,struct dlm_lockstatus * lksb)427 struct dlm_lock * dlm_new_lock(int type, u8 node, u64 cookie,
428 struct dlm_lockstatus *lksb)
429 {
430 struct dlm_lock *lock;
431 int kernel_allocated = 0;
432
433 lock = kmem_cache_zalloc(dlm_lock_cache, GFP_NOFS);
434 if (!lock)
435 return NULL;
436
437 if (!lksb) {
438 /* zero memory only if kernel-allocated */
439 lksb = kzalloc(sizeof(*lksb), GFP_NOFS);
440 if (!lksb) {
441 kmem_cache_free(dlm_lock_cache, lock);
442 return NULL;
443 }
444 kernel_allocated = 1;
445 }
446
447 dlm_init_lock(lock, type, node, cookie);
448 if (kernel_allocated)
449 lock->lksb_kernel_allocated = 1;
450 lock->lksb = lksb;
451 lksb->lockid = lock;
452 return lock;
453 }
454
455 /* handler for lock creation net message
456 * locking:
457 * caller needs: none
458 * taken: takes and drops res->spinlock
459 * held on exit: none
460 * returns: DLM_NORMAL, DLM_SYSERR, DLM_IVLOCKID, DLM_NOTQUEUED
461 */
dlm_create_lock_handler(struct o2net_msg * msg,u32 len,void * data,void ** ret_data)462 int dlm_create_lock_handler(struct o2net_msg *msg, u32 len, void *data,
463 void **ret_data)
464 {
465 struct dlm_ctxt *dlm = data;
466 struct dlm_create_lock *create = (struct dlm_create_lock *)msg->buf;
467 struct dlm_lock_resource *res = NULL;
468 struct dlm_lock *newlock = NULL;
469 struct dlm_lockstatus *lksb = NULL;
470 enum dlm_status status = DLM_NORMAL;
471 char *name;
472 unsigned int namelen;
473
474 BUG_ON(!dlm);
475
476 if (!dlm_grab(dlm))
477 return DLM_REJECTED;
478
479 name = create->name;
480 namelen = create->namelen;
481 status = DLM_REJECTED;
482 if (!dlm_domain_fully_joined(dlm)) {
483 mlog(ML_ERROR, "Domain %s not fully joined, but node %u is "
484 "sending a create_lock message for lock %.*s!\n",
485 dlm->name, create->node_idx, namelen, name);
486 dlm_error(status);
487 goto leave;
488 }
489
490 status = DLM_IVBUFLEN;
491 if (namelen > DLM_LOCKID_NAME_MAX) {
492 dlm_error(status);
493 goto leave;
494 }
495
496 status = DLM_SYSERR;
497 newlock = dlm_new_lock(create->requested_type,
498 create->node_idx,
499 be64_to_cpu(create->cookie), NULL);
500 if (!newlock) {
501 dlm_error(status);
502 goto leave;
503 }
504
505 lksb = newlock->lksb;
506
507 if (be32_to_cpu(create->flags) & LKM_GET_LVB) {
508 lksb->flags |= DLM_LKSB_GET_LVB;
509 mlog(0, "set DLM_LKSB_GET_LVB flag\n");
510 }
511
512 status = DLM_IVLOCKID;
513 res = dlm_lookup_lockres(dlm, name, namelen);
514 if (!res) {
515 dlm_error(status);
516 goto leave;
517 }
518
519 spin_lock(&res->spinlock);
520 status = __dlm_lockres_state_to_status(res);
521 spin_unlock(&res->spinlock);
522
523 if (status != DLM_NORMAL) {
524 mlog(0, "lockres recovering/migrating/in-progress\n");
525 goto leave;
526 }
527
528 dlm_lock_attach_lockres(newlock, res);
529
530 status = dlmlock_master(dlm, res, newlock, be32_to_cpu(create->flags));
531 leave:
532 if (status != DLM_NORMAL)
533 if (newlock)
534 dlm_lock_put(newlock);
535
536 if (res)
537 dlm_lockres_put(res);
538
539 dlm_put(dlm);
540
541 return status;
542 }
543
544
545 /* fetch next node-local (u8 nodenum + u56 cookie) into u64 */
dlm_get_next_cookie(u8 node_num,u64 * cookie)546 static inline void dlm_get_next_cookie(u8 node_num, u64 *cookie)
547 {
548 u64 tmpnode = node_num;
549
550 /* shift single byte of node num into top 8 bits */
551 tmpnode <<= 56;
552
553 spin_lock(&dlm_cookie_lock);
554 *cookie = (dlm_next_cookie | tmpnode);
555 if (++dlm_next_cookie & 0xff00000000000000ull) {
556 mlog(0, "This node's cookie will now wrap!\n");
557 dlm_next_cookie = 1;
558 }
559 spin_unlock(&dlm_cookie_lock);
560 }
561
dlmlock(struct dlm_ctxt * dlm,int mode,struct dlm_lockstatus * lksb,int flags,const char * name,int namelen,dlm_astlockfunc_t * ast,void * data,dlm_bastlockfunc_t * bast)562 enum dlm_status dlmlock(struct dlm_ctxt *dlm, int mode,
563 struct dlm_lockstatus *lksb, int flags,
564 const char *name, int namelen, dlm_astlockfunc_t *ast,
565 void *data, dlm_bastlockfunc_t *bast)
566 {
567 enum dlm_status status;
568 struct dlm_lock_resource *res = NULL;
569 struct dlm_lock *lock = NULL;
570 int convert = 0, recovery = 0;
571
572 /* yes this function is a mess.
573 * TODO: clean this up. lots of common code in the
574 * lock and convert paths, especially in the retry blocks */
575 if (!lksb) {
576 dlm_error(DLM_BADARGS);
577 return DLM_BADARGS;
578 }
579
580 status = DLM_BADPARAM;
581 if (mode != LKM_EXMODE && mode != LKM_PRMODE && mode != LKM_NLMODE) {
582 dlm_error(status);
583 goto error;
584 }
585
586 if (flags & ~LKM_VALID_FLAGS) {
587 dlm_error(status);
588 goto error;
589 }
590
591 convert = (flags & LKM_CONVERT);
592 recovery = (flags & LKM_RECOVERY);
593
594 if (recovery &&
595 (!dlm_is_recovery_lock(name, namelen) || convert) ) {
596 dlm_error(status);
597 goto error;
598 }
599 if (convert && (flags & LKM_LOCAL)) {
600 mlog(ML_ERROR, "strange LOCAL convert request!\n");
601 goto error;
602 }
603
604 if (convert) {
605 /* CONVERT request */
606
607 /* if converting, must pass in a valid dlm_lock */
608 lock = lksb->lockid;
609 if (!lock) {
610 mlog(ML_ERROR, "NULL lock pointer in convert "
611 "request\n");
612 goto error;
613 }
614
615 res = lock->lockres;
616 if (!res) {
617 mlog(ML_ERROR, "NULL lockres pointer in convert "
618 "request\n");
619 goto error;
620 }
621 dlm_lockres_get(res);
622
623 /* XXX: for ocfs2 purposes, the ast/bast/astdata/lksb are
624 * static after the original lock call. convert requests will
625 * ensure that everything is the same, or return DLM_BADARGS.
626 * this means that DLM_DENIED_NOASTS will never be returned.
627 */
628 if (lock->lksb != lksb || lock->ast != ast ||
629 lock->bast != bast || lock->astdata != data) {
630 status = DLM_BADARGS;
631 mlog(ML_ERROR, "new args: lksb=%p, ast=%p, bast=%p, "
632 "astdata=%p\n", lksb, ast, bast, data);
633 mlog(ML_ERROR, "orig args: lksb=%p, ast=%p, bast=%p, "
634 "astdata=%p\n", lock->lksb, lock->ast,
635 lock->bast, lock->astdata);
636 goto error;
637 }
638 retry_convert:
639 dlm_wait_for_recovery(dlm);
640
641 if (res->owner == dlm->node_num)
642 status = dlmconvert_master(dlm, res, lock, flags, mode);
643 else
644 status = dlmconvert_remote(dlm, res, lock, flags, mode);
645 if (status == DLM_RECOVERING || status == DLM_MIGRATING ||
646 status == DLM_FORWARD) {
647 /* for now, see how this works without sleeping
648 * and just retry right away. I suspect the reco
649 * or migration will complete fast enough that
650 * no waiting will be necessary */
651 mlog(0, "retrying convert with migration/recovery/"
652 "in-progress\n");
653 msleep(100);
654 goto retry_convert;
655 }
656 } else {
657 u64 tmpcookie;
658
659 /* LOCK request */
660 status = DLM_BADARGS;
661 if (!name) {
662 dlm_error(status);
663 goto error;
664 }
665
666 status = DLM_IVBUFLEN;
667 if (namelen > DLM_LOCKID_NAME_MAX || namelen < 1) {
668 dlm_error(status);
669 goto error;
670 }
671
672 dlm_get_next_cookie(dlm->node_num, &tmpcookie);
673 lock = dlm_new_lock(mode, dlm->node_num, tmpcookie, lksb);
674 if (!lock) {
675 dlm_error(status);
676 goto error;
677 }
678
679 if (!recovery)
680 dlm_wait_for_recovery(dlm);
681
682 /* find or create the lock resource */
683 res = dlm_get_lock_resource(dlm, name, namelen, flags);
684 if (!res) {
685 status = DLM_IVLOCKID;
686 dlm_error(status);
687 goto error;
688 }
689
690 mlog(0, "type=%d, flags = 0x%x\n", mode, flags);
691 mlog(0, "creating lock: lock=%p res=%p\n", lock, res);
692
693 dlm_lock_attach_lockres(lock, res);
694 lock->ast = ast;
695 lock->bast = bast;
696 lock->astdata = data;
697
698 retry_lock:
699 if (flags & LKM_VALBLK) {
700 mlog(0, "LKM_VALBLK passed by caller\n");
701
702 /* LVB requests for non PR, PW or EX locks are
703 * ignored. */
704 if (mode < LKM_PRMODE)
705 flags &= ~LKM_VALBLK;
706 else {
707 flags |= LKM_GET_LVB;
708 lock->lksb->flags |= DLM_LKSB_GET_LVB;
709 }
710 }
711
712 if (res->owner == dlm->node_num)
713 status = dlmlock_master(dlm, res, lock, flags);
714 else
715 status = dlmlock_remote(dlm, res, lock, flags);
716
717 if (status == DLM_RECOVERING || status == DLM_MIGRATING ||
718 status == DLM_FORWARD) {
719 msleep(100);
720 if (recovery) {
721 if (status != DLM_RECOVERING)
722 goto retry_lock;
723 /* wait to see the node go down, then
724 * drop down and allow the lockres to
725 * get cleaned up. need to remaster. */
726 dlm_wait_for_node_death(dlm, res->owner,
727 DLM_NODE_DEATH_WAIT_MAX);
728 } else {
729 dlm_wait_for_recovery(dlm);
730 goto retry_lock;
731 }
732 }
733
734 /* Inflight taken in dlm_get_lock_resource() is dropped here */
735 spin_lock(&res->spinlock);
736 dlm_lockres_drop_inflight_ref(dlm, res);
737 spin_unlock(&res->spinlock);
738
739 dlm_lockres_calc_usage(dlm, res);
740 dlm_kick_thread(dlm, res);
741
742 if (status != DLM_NORMAL) {
743 lock->lksb->flags &= ~DLM_LKSB_GET_LVB;
744 if (status != DLM_NOTQUEUED)
745 dlm_error(status);
746 goto error;
747 }
748 }
749
750 error:
751 if (status != DLM_NORMAL) {
752 if (lock && !convert)
753 dlm_lock_put(lock);
754 // this is kind of unnecessary
755 lksb->status = status;
756 }
757
758 /* put lockres ref from the convert path
759 * or from dlm_get_lock_resource */
760 if (res)
761 dlm_lockres_put(res);
762
763 return status;
764 }
765 EXPORT_SYMBOL_GPL(dlmlock);
766