1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * dlmlock.c |
4 | * |
5 | * underlying calls for lock creation |
6 | * |
7 | * Copyright (C) 2004 Oracle. All rights reserved. |
8 | */ |
9 | |
10 | |
11 | #include <linux/module.h> |
12 | #include <linux/fs.h> |
13 | #include <linux/types.h> |
14 | #include <linux/slab.h> |
15 | #include <linux/highmem.h> |
16 | #include <linux/init.h> |
17 | #include <linux/sysctl.h> |
18 | #include <linux/random.h> |
19 | #include <linux/blkdev.h> |
20 | #include <linux/socket.h> |
21 | #include <linux/inet.h> |
22 | #include <linux/spinlock.h> |
23 | #include <linux/delay.h> |
24 | |
25 | |
26 | #include "../cluster/heartbeat.h" |
27 | #include "../cluster/nodemanager.h" |
28 | #include "../cluster/tcp.h" |
29 | |
30 | #include "dlmapi.h" |
31 | #include "dlmcommon.h" |
32 | |
33 | #include "dlmconvert.h" |
34 | |
35 | #define MLOG_MASK_PREFIX ML_DLM |
36 | #include "../cluster/masklog.h" |
37 | |
38 | static struct kmem_cache *dlm_lock_cache; |
39 | |
40 | static DEFINE_SPINLOCK(dlm_cookie_lock); |
41 | static u64 dlm_next_cookie = 1; |
42 | |
43 | static enum dlm_status dlm_send_remote_lock_request(struct dlm_ctxt *dlm, |
44 | struct dlm_lock_resource *res, |
45 | struct dlm_lock *lock, int flags); |
46 | static void dlm_init_lock(struct dlm_lock *newlock, int type, |
47 | u8 node, u64 cookie); |
48 | static void dlm_lock_release(struct kref *kref); |
49 | static void dlm_lock_detach_lockres(struct dlm_lock *lock); |
50 | |
51 | int dlm_init_lock_cache(void) |
52 | { |
53 | dlm_lock_cache = kmem_cache_create(name: "o2dlm_lock" , |
54 | size: sizeof(struct dlm_lock), |
55 | align: 0, SLAB_HWCACHE_ALIGN, NULL); |
56 | if (dlm_lock_cache == NULL) |
57 | return -ENOMEM; |
58 | return 0; |
59 | } |
60 | |
61 | void dlm_destroy_lock_cache(void) |
62 | { |
63 | kmem_cache_destroy(s: dlm_lock_cache); |
64 | } |
65 | |
66 | /* Tell us whether we can grant a new lock request. |
67 | * locking: |
68 | * caller needs: res->spinlock |
69 | * taken: none |
70 | * held on exit: none |
71 | * returns: 1 if the lock can be granted, 0 otherwise. |
72 | */ |
73 | static int dlm_can_grant_new_lock(struct dlm_lock_resource *res, |
74 | struct dlm_lock *lock) |
75 | { |
76 | struct dlm_lock *tmplock; |
77 | |
78 | list_for_each_entry(tmplock, &res->granted, list) { |
79 | if (!dlm_lock_compatible(existing: tmplock->ml.type, request: lock->ml.type)) |
80 | return 0; |
81 | } |
82 | |
83 | list_for_each_entry(tmplock, &res->converting, list) { |
84 | if (!dlm_lock_compatible(existing: tmplock->ml.type, request: lock->ml.type)) |
85 | return 0; |
86 | if (!dlm_lock_compatible(existing: tmplock->ml.convert_type, |
87 | request: lock->ml.type)) |
88 | return 0; |
89 | } |
90 | |
91 | return 1; |
92 | } |
93 | |
94 | /* performs lock creation at the lockres master site |
95 | * locking: |
96 | * caller needs: none |
97 | * taken: takes and drops res->spinlock |
98 | * held on exit: none |
99 | * returns: DLM_NORMAL, DLM_NOTQUEUED |
100 | */ |
101 | static enum dlm_status dlmlock_master(struct dlm_ctxt *dlm, |
102 | struct dlm_lock_resource *res, |
103 | struct dlm_lock *lock, int flags) |
104 | { |
105 | int call_ast = 0, kick_thread = 0; |
106 | enum dlm_status status = DLM_NORMAL; |
107 | |
108 | mlog(0, "type=%d\n" , lock->ml.type); |
109 | |
110 | spin_lock(lock: &res->spinlock); |
111 | /* if called from dlm_create_lock_handler, need to |
112 | * ensure it will not sleep in dlm_wait_on_lockres */ |
113 | status = __dlm_lockres_state_to_status(res); |
114 | if (status != DLM_NORMAL && |
115 | lock->ml.node != dlm->node_num) { |
116 | /* erf. state changed after lock was dropped. */ |
117 | spin_unlock(lock: &res->spinlock); |
118 | dlm_error(status); |
119 | return status; |
120 | } |
121 | __dlm_wait_on_lockres(res); |
122 | __dlm_lockres_reserve_ast(res); |
123 | |
124 | if (dlm_can_grant_new_lock(res, lock)) { |
125 | mlog(0, "I can grant this lock right away\n" ); |
126 | /* got it right away */ |
127 | lock->lksb->status = DLM_NORMAL; |
128 | status = DLM_NORMAL; |
129 | dlm_lock_get(lock); |
130 | list_add_tail(new: &lock->list, head: &res->granted); |
131 | |
132 | /* for the recovery lock, we can't allow the ast |
133 | * to be queued since the dlmthread is already |
134 | * frozen. but the recovery lock is always locked |
135 | * with LKM_NOQUEUE so we do not need the ast in |
136 | * this special case */ |
137 | if (!dlm_is_recovery_lock(lock_name: res->lockname.name, |
138 | name_len: res->lockname.len)) { |
139 | kick_thread = 1; |
140 | call_ast = 1; |
141 | } else { |
142 | mlog(0, "%s: returning DLM_NORMAL to " |
143 | "node %u for reco lock\n" , dlm->name, |
144 | lock->ml.node); |
145 | } |
146 | } else { |
147 | /* for NOQUEUE request, unless we get the |
148 | * lock right away, return DLM_NOTQUEUED */ |
149 | if (flags & LKM_NOQUEUE) { |
150 | status = DLM_NOTQUEUED; |
151 | if (dlm_is_recovery_lock(lock_name: res->lockname.name, |
152 | name_len: res->lockname.len)) { |
153 | mlog(0, "%s: returning NOTQUEUED to " |
154 | "node %u for reco lock\n" , dlm->name, |
155 | lock->ml.node); |
156 | } |
157 | } else { |
158 | status = DLM_NORMAL; |
159 | dlm_lock_get(lock); |
160 | list_add_tail(new: &lock->list, head: &res->blocked); |
161 | kick_thread = 1; |
162 | } |
163 | } |
164 | |
165 | spin_unlock(lock: &res->spinlock); |
166 | wake_up(&res->wq); |
167 | |
168 | /* either queue the ast or release it */ |
169 | if (call_ast) |
170 | dlm_queue_ast(dlm, lock); |
171 | else |
172 | dlm_lockres_release_ast(dlm, res); |
173 | |
174 | dlm_lockres_calc_usage(dlm, res); |
175 | if (kick_thread) |
176 | dlm_kick_thread(dlm, res); |
177 | |
178 | return status; |
179 | } |
180 | |
181 | void dlm_revert_pending_lock(struct dlm_lock_resource *res, |
182 | struct dlm_lock *lock) |
183 | { |
184 | /* remove from local queue if it failed */ |
185 | list_del_init(entry: &lock->list); |
186 | lock->lksb->flags &= ~DLM_LKSB_GET_LVB; |
187 | } |
188 | |
189 | |
190 | /* |
191 | * locking: |
192 | * caller needs: none |
193 | * taken: takes and drops res->spinlock |
194 | * held on exit: none |
195 | * returns: DLM_DENIED, DLM_RECOVERING, or net status |
196 | */ |
197 | static enum dlm_status dlmlock_remote(struct dlm_ctxt *dlm, |
198 | struct dlm_lock_resource *res, |
199 | struct dlm_lock *lock, int flags) |
200 | { |
201 | enum dlm_status status = DLM_DENIED; |
202 | int lockres_changed = 1; |
203 | |
204 | mlog(0, "type=%d, lockres %.*s, flags = 0x%x\n" , |
205 | lock->ml.type, res->lockname.len, |
206 | res->lockname.name, flags); |
207 | |
208 | /* |
209 | * Wait if resource is getting recovered, remastered, etc. |
210 | * If the resource was remastered and new owner is self, then exit. |
211 | */ |
212 | spin_lock(lock: &res->spinlock); |
213 | __dlm_wait_on_lockres(res); |
214 | if (res->owner == dlm->node_num) { |
215 | spin_unlock(lock: &res->spinlock); |
216 | return DLM_RECOVERING; |
217 | } |
218 | res->state |= DLM_LOCK_RES_IN_PROGRESS; |
219 | |
220 | /* add lock to local (secondary) queue */ |
221 | dlm_lock_get(lock); |
222 | list_add_tail(new: &lock->list, head: &res->blocked); |
223 | lock->lock_pending = 1; |
224 | spin_unlock(lock: &res->spinlock); |
225 | |
226 | /* spec seems to say that you will get DLM_NORMAL when the lock |
227 | * has been queued, meaning we need to wait for a reply here. */ |
228 | status = dlm_send_remote_lock_request(dlm, res, lock, flags); |
229 | |
230 | spin_lock(lock: &res->spinlock); |
231 | res->state &= ~DLM_LOCK_RES_IN_PROGRESS; |
232 | lock->lock_pending = 0; |
233 | if (status != DLM_NORMAL) { |
234 | if (status == DLM_RECOVERING && |
235 | dlm_is_recovery_lock(lock_name: res->lockname.name, |
236 | name_len: res->lockname.len)) { |
237 | /* recovery lock was mastered by dead node. |
238 | * we need to have calc_usage shoot down this |
239 | * lockres and completely remaster it. */ |
240 | mlog(0, "%s: recovery lock was owned by " |
241 | "dead node %u, remaster it now.\n" , |
242 | dlm->name, res->owner); |
243 | } else if (status != DLM_NOTQUEUED) { |
244 | /* |
245 | * DO NOT call calc_usage, as this would unhash |
246 | * the remote lockres before we ever get to use |
247 | * it. treat as if we never made any change to |
248 | * the lockres. |
249 | */ |
250 | lockres_changed = 0; |
251 | dlm_error(status); |
252 | } |
253 | dlm_revert_pending_lock(res, lock); |
254 | dlm_lock_put(lock); |
255 | } else if (dlm_is_recovery_lock(lock_name: res->lockname.name, |
256 | name_len: res->lockname.len)) { |
257 | /* special case for the $RECOVERY lock. |
258 | * there will never be an AST delivered to put |
259 | * this lock on the proper secondary queue |
260 | * (granted), so do it manually. */ |
261 | mlog(0, "%s: $RECOVERY lock for this node (%u) is " |
262 | "mastered by %u; got lock, manually granting (no ast)\n" , |
263 | dlm->name, dlm->node_num, res->owner); |
264 | list_move_tail(list: &lock->list, head: &res->granted); |
265 | } |
266 | spin_unlock(lock: &res->spinlock); |
267 | |
268 | if (lockres_changed) |
269 | dlm_lockres_calc_usage(dlm, res); |
270 | |
271 | wake_up(&res->wq); |
272 | return status; |
273 | } |
274 | |
275 | |
276 | /* for remote lock creation. |
277 | * locking: |
278 | * caller needs: none, but need res->state & DLM_LOCK_RES_IN_PROGRESS |
279 | * taken: none |
280 | * held on exit: none |
281 | * returns: DLM_NOLOCKMGR, or net status |
282 | */ |
283 | static enum dlm_status dlm_send_remote_lock_request(struct dlm_ctxt *dlm, |
284 | struct dlm_lock_resource *res, |
285 | struct dlm_lock *lock, int flags) |
286 | { |
287 | struct dlm_create_lock create; |
288 | int tmpret, status = 0; |
289 | enum dlm_status ret; |
290 | |
291 | memset(&create, 0, sizeof(create)); |
292 | create.node_idx = dlm->node_num; |
293 | create.requested_type = lock->ml.type; |
294 | create.cookie = lock->ml.cookie; |
295 | create.namelen = res->lockname.len; |
296 | create.flags = cpu_to_be32(flags); |
297 | memcpy(create.name, res->lockname.name, create.namelen); |
298 | |
299 | tmpret = o2net_send_message(msg_type: DLM_CREATE_LOCK_MSG, key: dlm->key, data: &create, |
300 | len: sizeof(create), target_node: res->owner, status: &status); |
301 | if (tmpret >= 0) { |
302 | ret = status; |
303 | if (ret == DLM_REJECTED) { |
304 | mlog(ML_ERROR, "%s: res %.*s, Stale lockres no longer " |
305 | "owned by node %u. That node is coming back up " |
306 | "currently.\n" , dlm->name, create.namelen, |
307 | create.name, res->owner); |
308 | dlm_print_one_lock_resource(res); |
309 | BUG(); |
310 | } |
311 | } else { |
312 | mlog(ML_ERROR, "%s: res %.*s, Error %d send CREATE LOCK to " |
313 | "node %u\n" , dlm->name, create.namelen, create.name, |
314 | tmpret, res->owner); |
315 | if (dlm_is_host_down(errno: tmpret)) |
316 | ret = DLM_RECOVERING; |
317 | else |
318 | ret = dlm_err_to_dlm_status(err: tmpret); |
319 | } |
320 | |
321 | return ret; |
322 | } |
323 | |
324 | void dlm_lock_get(struct dlm_lock *lock) |
325 | { |
326 | kref_get(kref: &lock->lock_refs); |
327 | } |
328 | |
329 | void dlm_lock_put(struct dlm_lock *lock) |
330 | { |
331 | kref_put(kref: &lock->lock_refs, release: dlm_lock_release); |
332 | } |
333 | |
334 | static void dlm_lock_release(struct kref *kref) |
335 | { |
336 | struct dlm_lock *lock; |
337 | |
338 | lock = container_of(kref, struct dlm_lock, lock_refs); |
339 | |
340 | BUG_ON(!list_empty(&lock->list)); |
341 | BUG_ON(!list_empty(&lock->ast_list)); |
342 | BUG_ON(!list_empty(&lock->bast_list)); |
343 | BUG_ON(lock->ast_pending); |
344 | BUG_ON(lock->bast_pending); |
345 | |
346 | dlm_lock_detach_lockres(lock); |
347 | |
348 | if (lock->lksb_kernel_allocated) { |
349 | mlog(0, "freeing kernel-allocated lksb\n" ); |
350 | kfree(objp: lock->lksb); |
351 | } |
352 | kmem_cache_free(s: dlm_lock_cache, objp: lock); |
353 | } |
354 | |
355 | /* associate a lock with it's lockres, getting a ref on the lockres */ |
356 | void dlm_lock_attach_lockres(struct dlm_lock *lock, |
357 | struct dlm_lock_resource *res) |
358 | { |
359 | dlm_lockres_get(res); |
360 | lock->lockres = res; |
361 | } |
362 | |
363 | /* drop ref on lockres, if there is still one associated with lock */ |
364 | static void dlm_lock_detach_lockres(struct dlm_lock *lock) |
365 | { |
366 | struct dlm_lock_resource *res; |
367 | |
368 | res = lock->lockres; |
369 | if (res) { |
370 | lock->lockres = NULL; |
371 | mlog(0, "removing lock's lockres reference\n" ); |
372 | dlm_lockres_put(res); |
373 | } |
374 | } |
375 | |
376 | static void dlm_init_lock(struct dlm_lock *newlock, int type, |
377 | u8 node, u64 cookie) |
378 | { |
379 | INIT_LIST_HEAD(list: &newlock->list); |
380 | INIT_LIST_HEAD(list: &newlock->ast_list); |
381 | INIT_LIST_HEAD(list: &newlock->bast_list); |
382 | spin_lock_init(&newlock->spinlock); |
383 | newlock->ml.type = type; |
384 | newlock->ml.convert_type = LKM_IVMODE; |
385 | newlock->ml.highest_blocked = LKM_IVMODE; |
386 | newlock->ml.node = node; |
387 | newlock->ml.pad1 = 0; |
388 | newlock->ml.list = 0; |
389 | newlock->ml.flags = 0; |
390 | newlock->ast = NULL; |
391 | newlock->bast = NULL; |
392 | newlock->astdata = NULL; |
393 | newlock->ml.cookie = cpu_to_be64(cookie); |
394 | newlock->ast_pending = 0; |
395 | newlock->bast_pending = 0; |
396 | newlock->convert_pending = 0; |
397 | newlock->lock_pending = 0; |
398 | newlock->unlock_pending = 0; |
399 | newlock->cancel_pending = 0; |
400 | newlock->lksb_kernel_allocated = 0; |
401 | |
402 | kref_init(kref: &newlock->lock_refs); |
403 | } |
404 | |
405 | struct dlm_lock * dlm_new_lock(int type, u8 node, u64 cookie, |
406 | struct dlm_lockstatus *lksb) |
407 | { |
408 | struct dlm_lock *lock; |
409 | int kernel_allocated = 0; |
410 | |
411 | lock = kmem_cache_zalloc(k: dlm_lock_cache, GFP_NOFS); |
412 | if (!lock) |
413 | return NULL; |
414 | |
415 | if (!lksb) { |
416 | /* zero memory only if kernel-allocated */ |
417 | lksb = kzalloc(size: sizeof(*lksb), GFP_NOFS); |
418 | if (!lksb) { |
419 | kmem_cache_free(s: dlm_lock_cache, objp: lock); |
420 | return NULL; |
421 | } |
422 | kernel_allocated = 1; |
423 | } |
424 | |
425 | dlm_init_lock(newlock: lock, type, node, cookie); |
426 | if (kernel_allocated) |
427 | lock->lksb_kernel_allocated = 1; |
428 | lock->lksb = lksb; |
429 | lksb->lockid = lock; |
430 | return lock; |
431 | } |
432 | |
433 | /* handler for lock creation net message |
434 | * locking: |
435 | * caller needs: none |
436 | * taken: takes and drops res->spinlock |
437 | * held on exit: none |
438 | * returns: DLM_NORMAL, DLM_SYSERR, DLM_IVLOCKID, DLM_NOTQUEUED |
439 | */ |
440 | int dlm_create_lock_handler(struct o2net_msg *msg, u32 len, void *data, |
441 | void **ret_data) |
442 | { |
443 | struct dlm_ctxt *dlm = data; |
444 | struct dlm_create_lock *create = (struct dlm_create_lock *)msg->buf; |
445 | struct dlm_lock_resource *res = NULL; |
446 | struct dlm_lock *newlock = NULL; |
447 | struct dlm_lockstatus *lksb = NULL; |
448 | enum dlm_status status = DLM_NORMAL; |
449 | char *name; |
450 | unsigned int namelen; |
451 | |
452 | BUG_ON(!dlm); |
453 | |
454 | if (!dlm_grab(dlm)) |
455 | return DLM_REJECTED; |
456 | |
457 | name = create->name; |
458 | namelen = create->namelen; |
459 | status = DLM_REJECTED; |
460 | if (!dlm_domain_fully_joined(dlm)) { |
461 | mlog(ML_ERROR, "Domain %s not fully joined, but node %u is " |
462 | "sending a create_lock message for lock %.*s!\n" , |
463 | dlm->name, create->node_idx, namelen, name); |
464 | dlm_error(status); |
465 | goto leave; |
466 | } |
467 | |
468 | status = DLM_IVBUFLEN; |
469 | if (namelen > DLM_LOCKID_NAME_MAX) { |
470 | dlm_error(status); |
471 | goto leave; |
472 | } |
473 | |
474 | status = DLM_SYSERR; |
475 | newlock = dlm_new_lock(type: create->requested_type, |
476 | node: create->node_idx, |
477 | be64_to_cpu(create->cookie), NULL); |
478 | if (!newlock) { |
479 | dlm_error(status); |
480 | goto leave; |
481 | } |
482 | |
483 | lksb = newlock->lksb; |
484 | |
485 | if (be32_to_cpu(create->flags) & LKM_GET_LVB) { |
486 | lksb->flags |= DLM_LKSB_GET_LVB; |
487 | mlog(0, "set DLM_LKSB_GET_LVB flag\n" ); |
488 | } |
489 | |
490 | status = DLM_IVLOCKID; |
491 | res = dlm_lookup_lockres(dlm, name, len: namelen); |
492 | if (!res) { |
493 | dlm_error(status); |
494 | goto leave; |
495 | } |
496 | |
497 | spin_lock(lock: &res->spinlock); |
498 | status = __dlm_lockres_state_to_status(res); |
499 | spin_unlock(lock: &res->spinlock); |
500 | |
501 | if (status != DLM_NORMAL) { |
502 | mlog(0, "lockres recovering/migrating/in-progress\n" ); |
503 | goto leave; |
504 | } |
505 | |
506 | dlm_lock_attach_lockres(lock: newlock, res); |
507 | |
508 | status = dlmlock_master(dlm, res, lock: newlock, be32_to_cpu(create->flags)); |
509 | leave: |
510 | if (status != DLM_NORMAL) |
511 | if (newlock) |
512 | dlm_lock_put(lock: newlock); |
513 | |
514 | if (res) |
515 | dlm_lockres_put(res); |
516 | |
517 | dlm_put(dlm); |
518 | |
519 | return status; |
520 | } |
521 | |
522 | |
523 | /* fetch next node-local (u8 nodenum + u56 cookie) into u64 */ |
524 | static inline void dlm_get_next_cookie(u8 node_num, u64 *cookie) |
525 | { |
526 | u64 tmpnode = node_num; |
527 | |
528 | /* shift single byte of node num into top 8 bits */ |
529 | tmpnode <<= 56; |
530 | |
531 | spin_lock(lock: &dlm_cookie_lock); |
532 | *cookie = (dlm_next_cookie | tmpnode); |
533 | if (++dlm_next_cookie & 0xff00000000000000ull) { |
534 | mlog(0, "This node's cookie will now wrap!\n" ); |
535 | dlm_next_cookie = 1; |
536 | } |
537 | spin_unlock(lock: &dlm_cookie_lock); |
538 | } |
539 | |
540 | enum dlm_status dlmlock(struct dlm_ctxt *dlm, int mode, |
541 | struct dlm_lockstatus *lksb, int flags, |
542 | const char *name, int namelen, dlm_astlockfunc_t *ast, |
543 | void *data, dlm_bastlockfunc_t *bast) |
544 | { |
545 | enum dlm_status status; |
546 | struct dlm_lock_resource *res = NULL; |
547 | struct dlm_lock *lock = NULL; |
548 | int convert = 0, recovery = 0; |
549 | |
550 | /* yes this function is a mess. |
551 | * TODO: clean this up. lots of common code in the |
552 | * lock and convert paths, especially in the retry blocks */ |
553 | if (!lksb) { |
554 | dlm_error(DLM_BADARGS); |
555 | return DLM_BADARGS; |
556 | } |
557 | |
558 | status = DLM_BADPARAM; |
559 | if (mode != LKM_EXMODE && mode != LKM_PRMODE && mode != LKM_NLMODE) { |
560 | dlm_error(status); |
561 | goto error; |
562 | } |
563 | |
564 | if (flags & ~LKM_VALID_FLAGS) { |
565 | dlm_error(status); |
566 | goto error; |
567 | } |
568 | |
569 | convert = (flags & LKM_CONVERT); |
570 | recovery = (flags & LKM_RECOVERY); |
571 | |
572 | if (recovery && |
573 | (!dlm_is_recovery_lock(lock_name: name, name_len: namelen) || convert) ) { |
574 | dlm_error(status); |
575 | goto error; |
576 | } |
577 | if (convert && (flags & LKM_LOCAL)) { |
578 | mlog(ML_ERROR, "strange LOCAL convert request!\n" ); |
579 | goto error; |
580 | } |
581 | |
582 | if (convert) { |
583 | /* CONVERT request */ |
584 | |
585 | /* if converting, must pass in a valid dlm_lock */ |
586 | lock = lksb->lockid; |
587 | if (!lock) { |
588 | mlog(ML_ERROR, "NULL lock pointer in convert " |
589 | "request\n" ); |
590 | goto error; |
591 | } |
592 | |
593 | res = lock->lockres; |
594 | if (!res) { |
595 | mlog(ML_ERROR, "NULL lockres pointer in convert " |
596 | "request\n" ); |
597 | goto error; |
598 | } |
599 | dlm_lockres_get(res); |
600 | |
601 | /* XXX: for ocfs2 purposes, the ast/bast/astdata/lksb are |
602 | * static after the original lock call. convert requests will |
603 | * ensure that everything is the same, or return DLM_BADARGS. |
604 | * this means that DLM_DENIED_NOASTS will never be returned. |
605 | */ |
606 | if (lock->lksb != lksb || lock->ast != ast || |
607 | lock->bast != bast || lock->astdata != data) { |
608 | status = DLM_BADARGS; |
609 | mlog(ML_ERROR, "new args: lksb=%p, ast=%p, bast=%p, " |
610 | "astdata=%p\n" , lksb, ast, bast, data); |
611 | mlog(ML_ERROR, "orig args: lksb=%p, ast=%p, bast=%p, " |
612 | "astdata=%p\n" , lock->lksb, lock->ast, |
613 | lock->bast, lock->astdata); |
614 | goto error; |
615 | } |
616 | retry_convert: |
617 | dlm_wait_for_recovery(dlm); |
618 | |
619 | if (res->owner == dlm->node_num) |
620 | status = dlmconvert_master(dlm, res, lock, flags, type: mode); |
621 | else |
622 | status = dlmconvert_remote(dlm, res, lock, flags, type: mode); |
623 | if (status == DLM_RECOVERING || status == DLM_MIGRATING || |
624 | status == DLM_FORWARD) { |
625 | /* for now, see how this works without sleeping |
626 | * and just retry right away. I suspect the reco |
627 | * or migration will complete fast enough that |
628 | * no waiting will be necessary */ |
629 | mlog(0, "retrying convert with migration/recovery/" |
630 | "in-progress\n" ); |
631 | msleep(msecs: 100); |
632 | goto retry_convert; |
633 | } |
634 | } else { |
635 | u64 tmpcookie; |
636 | |
637 | /* LOCK request */ |
638 | status = DLM_BADARGS; |
639 | if (!name) { |
640 | dlm_error(status); |
641 | goto error; |
642 | } |
643 | |
644 | status = DLM_IVBUFLEN; |
645 | if (namelen > DLM_LOCKID_NAME_MAX || namelen < 1) { |
646 | dlm_error(status); |
647 | goto error; |
648 | } |
649 | |
650 | dlm_get_next_cookie(node_num: dlm->node_num, cookie: &tmpcookie); |
651 | lock = dlm_new_lock(type: mode, node: dlm->node_num, cookie: tmpcookie, lksb); |
652 | if (!lock) { |
653 | dlm_error(status); |
654 | goto error; |
655 | } |
656 | |
657 | if (!recovery) |
658 | dlm_wait_for_recovery(dlm); |
659 | |
660 | /* find or create the lock resource */ |
661 | res = dlm_get_lock_resource(dlm, lockid: name, namelen, flags); |
662 | if (!res) { |
663 | status = DLM_IVLOCKID; |
664 | dlm_error(status); |
665 | goto error; |
666 | } |
667 | |
668 | mlog(0, "type=%d, flags = 0x%x\n" , mode, flags); |
669 | mlog(0, "creating lock: lock=%p res=%p\n" , lock, res); |
670 | |
671 | dlm_lock_attach_lockres(lock, res); |
672 | lock->ast = ast; |
673 | lock->bast = bast; |
674 | lock->astdata = data; |
675 | |
676 | retry_lock: |
677 | if (flags & LKM_VALBLK) { |
678 | mlog(0, "LKM_VALBLK passed by caller\n" ); |
679 | |
680 | /* LVB requests for non PR, PW or EX locks are |
681 | * ignored. */ |
682 | if (mode < LKM_PRMODE) |
683 | flags &= ~LKM_VALBLK; |
684 | else { |
685 | flags |= LKM_GET_LVB; |
686 | lock->lksb->flags |= DLM_LKSB_GET_LVB; |
687 | } |
688 | } |
689 | |
690 | if (res->owner == dlm->node_num) |
691 | status = dlmlock_master(dlm, res, lock, flags); |
692 | else |
693 | status = dlmlock_remote(dlm, res, lock, flags); |
694 | |
695 | if (status == DLM_RECOVERING || status == DLM_MIGRATING || |
696 | status == DLM_FORWARD) { |
697 | msleep(msecs: 100); |
698 | if (recovery) { |
699 | if (status != DLM_RECOVERING) |
700 | goto retry_lock; |
701 | /* wait to see the node go down, then |
702 | * drop down and allow the lockres to |
703 | * get cleaned up. need to remaster. */ |
704 | dlm_wait_for_node_death(dlm, node: res->owner, |
705 | DLM_NODE_DEATH_WAIT_MAX); |
706 | } else { |
707 | dlm_wait_for_recovery(dlm); |
708 | goto retry_lock; |
709 | } |
710 | } |
711 | |
712 | /* Inflight taken in dlm_get_lock_resource() is dropped here */ |
713 | spin_lock(lock: &res->spinlock); |
714 | dlm_lockres_drop_inflight_ref(dlm, res); |
715 | spin_unlock(lock: &res->spinlock); |
716 | |
717 | dlm_lockres_calc_usage(dlm, res); |
718 | dlm_kick_thread(dlm, res); |
719 | |
720 | if (status != DLM_NORMAL) { |
721 | lock->lksb->flags &= ~DLM_LKSB_GET_LVB; |
722 | if (status != DLM_NOTQUEUED) |
723 | dlm_error(status); |
724 | goto error; |
725 | } |
726 | } |
727 | |
728 | error: |
729 | if (status != DLM_NORMAL) { |
730 | if (lock && !convert) |
731 | dlm_lock_put(lock); |
732 | // this is kind of unnecessary |
733 | lksb->status = status; |
734 | } |
735 | |
736 | /* put lockres ref from the convert path |
737 | * or from dlm_get_lock_resource */ |
738 | if (res) |
739 | dlm_lockres_put(res); |
740 | |
741 | return status; |
742 | } |
743 | EXPORT_SYMBOL_GPL(dlmlock); |
744 | |