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6714d8e8 KH |
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> | |
6714d8e8 KH |
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 | ||
724bdca9 SM |
55 | static struct kmem_cache *dlm_lock_cache = NULL; |
56 | ||
34af946a | 57 | static DEFINE_SPINLOCK(dlm_cookie_lock); |
6714d8e8 KH |
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 | ||
724bdca9 SM |
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 | ||
78 | void dlm_destroy_lock_cache(void) | |
79 | { | |
80 | if (dlm_lock_cache) | |
81 | kmem_cache_destroy(dlm_lock_cache); | |
82 | } | |
83 | ||
6714d8e8 KH |
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 | */ | |
91 | static int dlm_can_grant_new_lock(struct dlm_lock_resource *res, | |
92 | struct dlm_lock *lock) | |
93 | { | |
6714d8e8 KH |
94 | struct dlm_lock *tmplock; |
95 | ||
df53cd3b | 96 | list_for_each_entry(tmplock, &res->granted, list) { |
6714d8e8 KH |
97 | if (!dlm_lock_compatible(tmplock->ml.type, lock->ml.type)) |
98 | return 0; | |
99 | } | |
100 | ||
df53cd3b | 101 | list_for_each_entry(tmplock, &res->converting, list) { |
6714d8e8 KH |
102 | if (!dlm_lock_compatible(tmplock->ml.type, lock->ml.type)) |
103 | return 0; | |
66f45005 WW |
104 | if (!dlm_lock_compatible(tmplock->ml.convert_type, |
105 | lock->ml.type)) | |
106 | return 0; | |
6714d8e8 KH |
107 | } |
108 | ||
109 | return 1; | |
110 | } | |
111 | ||
112 | /* performs lock creation at the lockres master site | |
113 | * locking: | |
114 | * caller needs: none | |
115 | * taken: takes and drops res->spinlock | |
116 | * held on exit: none | |
117 | * returns: DLM_NORMAL, DLM_NOTQUEUED | |
118 | */ | |
119 | static enum dlm_status dlmlock_master(struct dlm_ctxt *dlm, | |
120 | struct dlm_lock_resource *res, | |
121 | struct dlm_lock *lock, int flags) | |
122 | { | |
123 | int call_ast = 0, kick_thread = 0; | |
124 | enum dlm_status status = DLM_NORMAL; | |
125 | ||
ef6b689b | 126 | mlog(0, "type=%d\n", lock->ml.type); |
6714d8e8 KH |
127 | |
128 | spin_lock(&res->spinlock); | |
129 | /* if called from dlm_create_lock_handler, need to | |
130 | * ensure it will not sleep in dlm_wait_on_lockres */ | |
131 | status = __dlm_lockres_state_to_status(res); | |
132 | if (status != DLM_NORMAL && | |
133 | lock->ml.node != dlm->node_num) { | |
134 | /* erf. state changed after lock was dropped. */ | |
135 | spin_unlock(&res->spinlock); | |
136 | dlm_error(status); | |
137 | return status; | |
138 | } | |
139 | __dlm_wait_on_lockres(res); | |
140 | __dlm_lockres_reserve_ast(res); | |
141 | ||
142 | if (dlm_can_grant_new_lock(res, lock)) { | |
143 | mlog(0, "I can grant this lock right away\n"); | |
144 | /* got it right away */ | |
145 | lock->lksb->status = DLM_NORMAL; | |
146 | status = DLM_NORMAL; | |
147 | dlm_lock_get(lock); | |
148 | list_add_tail(&lock->list, &res->granted); | |
149 | ||
150 | /* for the recovery lock, we can't allow the ast | |
151 | * to be queued since the dlmthread is already | |
152 | * frozen. but the recovery lock is always locked | |
153 | * with LKM_NOQUEUE so we do not need the ast in | |
154 | * this special case */ | |
155 | if (!dlm_is_recovery_lock(res->lockname.name, | |
156 | res->lockname.len)) { | |
157 | kick_thread = 1; | |
158 | call_ast = 1; | |
c03872f5 KH |
159 | } else { |
160 | mlog(0, "%s: returning DLM_NORMAL to " | |
161 | "node %u for reco lock\n", dlm->name, | |
162 | lock->ml.node); | |
6714d8e8 KH |
163 | } |
164 | } else { | |
165 | /* for NOQUEUE request, unless we get the | |
166 | * lock right away, return DLM_NOTQUEUED */ | |
c03872f5 | 167 | if (flags & LKM_NOQUEUE) { |
6714d8e8 | 168 | status = DLM_NOTQUEUED; |
c03872f5 KH |
169 | if (dlm_is_recovery_lock(res->lockname.name, |
170 | res->lockname.len)) { | |
171 | mlog(0, "%s: returning NOTQUEUED to " | |
172 | "node %u for reco lock\n", dlm->name, | |
173 | lock->ml.node); | |
174 | } | |
175 | } else { | |
096b2ef8 | 176 | status = DLM_NORMAL; |
6714d8e8 KH |
177 | dlm_lock_get(lock); |
178 | list_add_tail(&lock->list, &res->blocked); | |
179 | kick_thread = 1; | |
180 | } | |
181 | } | |
182 | ||
183 | spin_unlock(&res->spinlock); | |
184 | wake_up(&res->wq); | |
185 | ||
186 | /* either queue the ast or release it */ | |
187 | if (call_ast) | |
188 | dlm_queue_ast(dlm, lock); | |
189 | else | |
190 | dlm_lockres_release_ast(dlm, res); | |
191 | ||
192 | dlm_lockres_calc_usage(dlm, res); | |
193 | if (kick_thread) | |
194 | dlm_kick_thread(dlm, res); | |
195 | ||
196 | return status; | |
197 | } | |
198 | ||
199 | void dlm_revert_pending_lock(struct dlm_lock_resource *res, | |
200 | struct dlm_lock *lock) | |
201 | { | |
202 | /* remove from local queue if it failed */ | |
203 | list_del_init(&lock->list); | |
204 | lock->lksb->flags &= ~DLM_LKSB_GET_LVB; | |
205 | } | |
206 | ||
207 | ||
208 | /* | |
209 | * locking: | |
210 | * caller needs: none | |
211 | * taken: takes and drops res->spinlock | |
212 | * held on exit: none | |
213 | * returns: DLM_DENIED, DLM_RECOVERING, or net status | |
214 | */ | |
215 | static enum dlm_status dlmlock_remote(struct dlm_ctxt *dlm, | |
216 | struct dlm_lock_resource *res, | |
217 | struct dlm_lock *lock, int flags) | |
218 | { | |
219 | enum dlm_status status = DLM_DENIED; | |
2abaf97e | 220 | int lockres_changed = 1; |
6714d8e8 | 221 | |
ef6b689b TM |
222 | mlog(0, "type=%d, lockres %.*s, flags = 0x%x\n", |
223 | lock->ml.type, res->lockname.len, | |
6714d8e8 KH |
224 | res->lockname.name, flags); |
225 | ||
a2c0cc15 SM |
226 | /* |
227 | * Wait if resource is getting recovered, remastered, etc. | |
228 | * If the resource was remastered and new owner is self, then exit. | |
229 | */ | |
6714d8e8 | 230 | spin_lock(&res->spinlock); |
6714d8e8 | 231 | __dlm_wait_on_lockres(res); |
a2c0cc15 SM |
232 | if (res->owner == dlm->node_num) { |
233 | spin_unlock(&res->spinlock); | |
234 | return DLM_RECOVERING; | |
235 | } | |
6714d8e8 KH |
236 | res->state |= DLM_LOCK_RES_IN_PROGRESS; |
237 | ||
238 | /* add lock to local (secondary) queue */ | |
239 | dlm_lock_get(lock); | |
240 | list_add_tail(&lock->list, &res->blocked); | |
241 | lock->lock_pending = 1; | |
242 | spin_unlock(&res->spinlock); | |
243 | ||
244 | /* spec seems to say that you will get DLM_NORMAL when the lock | |
245 | * has been queued, meaning we need to wait for a reply here. */ | |
246 | status = dlm_send_remote_lock_request(dlm, res, lock, flags); | |
247 | ||
248 | spin_lock(&res->spinlock); | |
249 | res->state &= ~DLM_LOCK_RES_IN_PROGRESS; | |
250 | lock->lock_pending = 0; | |
251 | if (status != DLM_NORMAL) { | |
c8df412e KH |
252 | if (status == DLM_RECOVERING && |
253 | dlm_is_recovery_lock(res->lockname.name, | |
254 | res->lockname.len)) { | |
255 | /* recovery lock was mastered by dead node. | |
256 | * we need to have calc_usage shoot down this | |
257 | * lockres and completely remaster it. */ | |
258 | mlog(0, "%s: recovery lock was owned by " | |
259 | "dead node %u, remaster it now.\n", | |
260 | dlm->name, res->owner); | |
261 | } else if (status != DLM_NOTQUEUED) { | |
c87a9ae7 KH |
262 | /* |
263 | * DO NOT call calc_usage, as this would unhash | |
264 | * the remote lockres before we ever get to use | |
265 | * it. treat as if we never made any change to | |
266 | * the lockres. | |
267 | */ | |
268 | lockres_changed = 0; | |
6714d8e8 | 269 | dlm_error(status); |
c87a9ae7 | 270 | } |
6714d8e8 KH |
271 | dlm_revert_pending_lock(res, lock); |
272 | dlm_lock_put(lock); | |
2bd63216 | 273 | } else if (dlm_is_recovery_lock(res->lockname.name, |
558c70c5 KH |
274 | res->lockname.len)) { |
275 | /* special case for the $RECOVERY lock. | |
276 | * there will never be an AST delivered to put | |
277 | * this lock on the proper secondary queue | |
278 | * (granted), so do it manually. */ | |
279 | mlog(0, "%s: $RECOVERY lock for this node (%u) is " | |
280 | "mastered by %u; got lock, manually granting (no ast)\n", | |
281 | dlm->name, dlm->node_num, res->owner); | |
f116629d | 282 | list_move_tail(&lock->list, &res->granted); |
6714d8e8 KH |
283 | } |
284 | spin_unlock(&res->spinlock); | |
285 | ||
2abaf97e KH |
286 | if (lockres_changed) |
287 | dlm_lockres_calc_usage(dlm, res); | |
6714d8e8 KH |
288 | |
289 | wake_up(&res->wq); | |
290 | return status; | |
291 | } | |
292 | ||
293 | ||
294 | /* for remote lock creation. | |
295 | * locking: | |
296 | * caller needs: none, but need res->state & DLM_LOCK_RES_IN_PROGRESS | |
297 | * taken: none | |
298 | * held on exit: none | |
299 | * returns: DLM_NOLOCKMGR, or net status | |
300 | */ | |
301 | static enum dlm_status dlm_send_remote_lock_request(struct dlm_ctxt *dlm, | |
302 | struct dlm_lock_resource *res, | |
303 | struct dlm_lock *lock, int flags) | |
304 | { | |
305 | struct dlm_create_lock create; | |
306 | int tmpret, status = 0; | |
307 | enum dlm_status ret; | |
308 | ||
6714d8e8 KH |
309 | memset(&create, 0, sizeof(create)); |
310 | create.node_idx = dlm->node_num; | |
311 | create.requested_type = lock->ml.type; | |
312 | create.cookie = lock->ml.cookie; | |
313 | create.namelen = res->lockname.len; | |
314 | create.flags = cpu_to_be32(flags); | |
315 | memcpy(create.name, res->lockname.name, create.namelen); | |
316 | ||
317 | tmpret = o2net_send_message(DLM_CREATE_LOCK_MSG, dlm->key, &create, | |
318 | sizeof(create), res->owner, &status); | |
319 | if (tmpret >= 0) { | |
8decab3c | 320 | ret = status; |
495ac96e | 321 | if (ret == DLM_REJECTED) { |
8decab3c SM |
322 | mlog(ML_ERROR, "%s: res %.*s, Stale lockres no longer " |
323 | "owned by node %u. That node is coming back up " | |
324 | "currently.\n", dlm->name, create.namelen, | |
e4eb0368 KH |
325 | create.name, res->owner); |
326 | dlm_print_one_lock_resource(res); | |
327 | BUG(); | |
328 | } | |
6714d8e8 | 329 | } else { |
8decab3c SM |
330 | mlog(ML_ERROR, "%s: res %.*s, Error %d send CREATE LOCK to " |
331 | "node %u\n", dlm->name, create.namelen, create.name, | |
332 | tmpret, res->owner); | |
333 | if (dlm_is_host_down(tmpret)) | |
6714d8e8 | 334 | ret = DLM_RECOVERING; |
8decab3c | 335 | else |
6714d8e8 | 336 | ret = dlm_err_to_dlm_status(tmpret); |
6714d8e8 KH |
337 | } |
338 | ||
339 | return ret; | |
340 | } | |
341 | ||
342 | void dlm_lock_get(struct dlm_lock *lock) | |
343 | { | |
344 | kref_get(&lock->lock_refs); | |
345 | } | |
346 | ||
347 | void dlm_lock_put(struct dlm_lock *lock) | |
348 | { | |
349 | kref_put(&lock->lock_refs, dlm_lock_release); | |
350 | } | |
351 | ||
352 | static void dlm_lock_release(struct kref *kref) | |
353 | { | |
354 | struct dlm_lock *lock; | |
355 | ||
356 | lock = container_of(kref, struct dlm_lock, lock_refs); | |
357 | ||
358 | BUG_ON(!list_empty(&lock->list)); | |
359 | BUG_ON(!list_empty(&lock->ast_list)); | |
360 | BUG_ON(!list_empty(&lock->bast_list)); | |
361 | BUG_ON(lock->ast_pending); | |
362 | BUG_ON(lock->bast_pending); | |
363 | ||
364 | dlm_lock_detach_lockres(lock); | |
365 | ||
366 | if (lock->lksb_kernel_allocated) { | |
367 | mlog(0, "freeing kernel-allocated lksb\n"); | |
368 | kfree(lock->lksb); | |
369 | } | |
724bdca9 | 370 | kmem_cache_free(dlm_lock_cache, lock); |
6714d8e8 KH |
371 | } |
372 | ||
373 | /* associate a lock with it's lockres, getting a ref on the lockres */ | |
374 | void dlm_lock_attach_lockres(struct dlm_lock *lock, | |
375 | struct dlm_lock_resource *res) | |
376 | { | |
377 | dlm_lockres_get(res); | |
378 | lock->lockres = res; | |
379 | } | |
380 | ||
381 | /* drop ref on lockres, if there is still one associated with lock */ | |
382 | static void dlm_lock_detach_lockres(struct dlm_lock *lock) | |
383 | { | |
384 | struct dlm_lock_resource *res; | |
385 | ||
386 | res = lock->lockres; | |
387 | if (res) { | |
388 | lock->lockres = NULL; | |
389 | mlog(0, "removing lock's lockres reference\n"); | |
390 | dlm_lockres_put(res); | |
391 | } | |
392 | } | |
393 | ||
394 | static void dlm_init_lock(struct dlm_lock *newlock, int type, | |
395 | u8 node, u64 cookie) | |
396 | { | |
397 | INIT_LIST_HEAD(&newlock->list); | |
398 | INIT_LIST_HEAD(&newlock->ast_list); | |
399 | INIT_LIST_HEAD(&newlock->bast_list); | |
400 | spin_lock_init(&newlock->spinlock); | |
401 | newlock->ml.type = type; | |
402 | newlock->ml.convert_type = LKM_IVMODE; | |
403 | newlock->ml.highest_blocked = LKM_IVMODE; | |
404 | newlock->ml.node = node; | |
405 | newlock->ml.pad1 = 0; | |
406 | newlock->ml.list = 0; | |
407 | newlock->ml.flags = 0; | |
408 | newlock->ast = NULL; | |
409 | newlock->bast = NULL; | |
410 | newlock->astdata = NULL; | |
411 | newlock->ml.cookie = cpu_to_be64(cookie); | |
412 | newlock->ast_pending = 0; | |
413 | newlock->bast_pending = 0; | |
414 | newlock->convert_pending = 0; | |
415 | newlock->lock_pending = 0; | |
416 | newlock->unlock_pending = 0; | |
417 | newlock->cancel_pending = 0; | |
418 | newlock->lksb_kernel_allocated = 0; | |
419 | ||
420 | kref_init(&newlock->lock_refs); | |
421 | } | |
422 | ||
423 | struct dlm_lock * dlm_new_lock(int type, u8 node, u64 cookie, | |
424 | struct dlm_lockstatus *lksb) | |
425 | { | |
426 | struct dlm_lock *lock; | |
427 | int kernel_allocated = 0; | |
428 | ||
3914ed0c | 429 | lock = kmem_cache_zalloc(dlm_lock_cache, GFP_NOFS); |
6714d8e8 KH |
430 | if (!lock) |
431 | return NULL; | |
432 | ||
433 | if (!lksb) { | |
434 | /* zero memory only if kernel-allocated */ | |
cd861280 | 435 | lksb = kzalloc(sizeof(*lksb), GFP_NOFS); |
6714d8e8 | 436 | if (!lksb) { |
fc9f8994 | 437 | kmem_cache_free(dlm_lock_cache, lock); |
6714d8e8 KH |
438 | return NULL; |
439 | } | |
440 | kernel_allocated = 1; | |
441 | } | |
442 | ||
443 | dlm_init_lock(lock, type, node, cookie); | |
444 | if (kernel_allocated) | |
445 | lock->lksb_kernel_allocated = 1; | |
446 | lock->lksb = lksb; | |
447 | lksb->lockid = lock; | |
448 | return lock; | |
449 | } | |
450 | ||
451 | /* handler for lock creation net message | |
452 | * locking: | |
453 | * caller needs: none | |
454 | * taken: takes and drops res->spinlock | |
455 | * held on exit: none | |
456 | * returns: DLM_NORMAL, DLM_SYSERR, DLM_IVLOCKID, DLM_NOTQUEUED | |
457 | */ | |
d74c9803 KH |
458 | int dlm_create_lock_handler(struct o2net_msg *msg, u32 len, void *data, |
459 | void **ret_data) | |
6714d8e8 KH |
460 | { |
461 | struct dlm_ctxt *dlm = data; | |
462 | struct dlm_create_lock *create = (struct dlm_create_lock *)msg->buf; | |
463 | struct dlm_lock_resource *res = NULL; | |
464 | struct dlm_lock *newlock = NULL; | |
465 | struct dlm_lockstatus *lksb = NULL; | |
466 | enum dlm_status status = DLM_NORMAL; | |
467 | char *name; | |
468 | unsigned int namelen; | |
469 | ||
470 | BUG_ON(!dlm); | |
471 | ||
6714d8e8 KH |
472 | if (!dlm_grab(dlm)) |
473 | return DLM_REJECTED; | |
474 | ||
6714d8e8 KH |
475 | name = create->name; |
476 | namelen = create->namelen; | |
495ac96e | 477 | status = DLM_REJECTED; |
e4eb0368 KH |
478 | if (!dlm_domain_fully_joined(dlm)) { |
479 | mlog(ML_ERROR, "Domain %s not fully joined, but node %u is " | |
480 | "sending a create_lock message for lock %.*s!\n", | |
481 | dlm->name, create->node_idx, namelen, name); | |
482 | dlm_error(status); | |
483 | goto leave; | |
484 | } | |
6714d8e8 KH |
485 | |
486 | status = DLM_IVBUFLEN; | |
487 | if (namelen > DLM_LOCKID_NAME_MAX) { | |
488 | dlm_error(status); | |
489 | goto leave; | |
490 | } | |
491 | ||
492 | status = DLM_SYSERR; | |
493 | newlock = dlm_new_lock(create->requested_type, | |
494 | create->node_idx, | |
495 | be64_to_cpu(create->cookie), NULL); | |
496 | if (!newlock) { | |
497 | dlm_error(status); | |
498 | goto leave; | |
499 | } | |
500 | ||
501 | lksb = newlock->lksb; | |
502 | ||
503 | if (be32_to_cpu(create->flags) & LKM_GET_LVB) { | |
504 | lksb->flags |= DLM_LKSB_GET_LVB; | |
505 | mlog(0, "set DLM_LKSB_GET_LVB flag\n"); | |
506 | } | |
507 | ||
508 | status = DLM_IVLOCKID; | |
509 | res = dlm_lookup_lockres(dlm, name, namelen); | |
510 | if (!res) { | |
511 | dlm_error(status); | |
512 | goto leave; | |
513 | } | |
514 | ||
515 | spin_lock(&res->spinlock); | |
516 | status = __dlm_lockres_state_to_status(res); | |
517 | spin_unlock(&res->spinlock); | |
518 | ||
519 | if (status != DLM_NORMAL) { | |
520 | mlog(0, "lockres recovering/migrating/in-progress\n"); | |
521 | goto leave; | |
522 | } | |
523 | ||
524 | dlm_lock_attach_lockres(newlock, res); | |
525 | ||
526 | status = dlmlock_master(dlm, res, newlock, be32_to_cpu(create->flags)); | |
527 | leave: | |
528 | if (status != DLM_NORMAL) | |
529 | if (newlock) | |
530 | dlm_lock_put(newlock); | |
531 | ||
532 | if (res) | |
533 | dlm_lockres_put(res); | |
534 | ||
535 | dlm_put(dlm); | |
536 | ||
537 | return status; | |
538 | } | |
539 | ||
540 | ||
541 | /* fetch next node-local (u8 nodenum + u56 cookie) into u64 */ | |
542 | static inline void dlm_get_next_cookie(u8 node_num, u64 *cookie) | |
543 | { | |
544 | u64 tmpnode = node_num; | |
545 | ||
546 | /* shift single byte of node num into top 8 bits */ | |
547 | tmpnode <<= 56; | |
548 | ||
549 | spin_lock(&dlm_cookie_lock); | |
550 | *cookie = (dlm_next_cookie | tmpnode); | |
551 | if (++dlm_next_cookie & 0xff00000000000000ull) { | |
552 | mlog(0, "This node's cookie will now wrap!\n"); | |
553 | dlm_next_cookie = 1; | |
554 | } | |
555 | spin_unlock(&dlm_cookie_lock); | |
556 | } | |
557 | ||
558 | enum dlm_status dlmlock(struct dlm_ctxt *dlm, int mode, | |
559 | struct dlm_lockstatus *lksb, int flags, | |
3384f3df MF |
560 | const char *name, int namelen, dlm_astlockfunc_t *ast, |
561 | void *data, dlm_bastlockfunc_t *bast) | |
6714d8e8 KH |
562 | { |
563 | enum dlm_status status; | |
564 | struct dlm_lock_resource *res = NULL; | |
565 | struct dlm_lock *lock = NULL; | |
566 | int convert = 0, recovery = 0; | |
567 | ||
568 | /* yes this function is a mess. | |
569 | * TODO: clean this up. lots of common code in the | |
570 | * lock and convert paths, especially in the retry blocks */ | |
571 | if (!lksb) { | |
572 | dlm_error(DLM_BADARGS); | |
573 | return DLM_BADARGS; | |
574 | } | |
575 | ||
576 | status = DLM_BADPARAM; | |
577 | if (mode != LKM_EXMODE && mode != LKM_PRMODE && mode != LKM_NLMODE) { | |
578 | dlm_error(status); | |
579 | goto error; | |
580 | } | |
581 | ||
582 | if (flags & ~LKM_VALID_FLAGS) { | |
583 | dlm_error(status); | |
584 | goto error; | |
585 | } | |
586 | ||
587 | convert = (flags & LKM_CONVERT); | |
588 | recovery = (flags & LKM_RECOVERY); | |
589 | ||
590 | if (recovery && | |
3384f3df | 591 | (!dlm_is_recovery_lock(name, namelen) || convert) ) { |
6714d8e8 KH |
592 | dlm_error(status); |
593 | goto error; | |
594 | } | |
595 | if (convert && (flags & LKM_LOCAL)) { | |
596 | mlog(ML_ERROR, "strange LOCAL convert request!\n"); | |
597 | goto error; | |
598 | } | |
599 | ||
600 | if (convert) { | |
601 | /* CONVERT request */ | |
602 | ||
603 | /* if converting, must pass in a valid dlm_lock */ | |
604 | lock = lksb->lockid; | |
605 | if (!lock) { | |
606 | mlog(ML_ERROR, "NULL lock pointer in convert " | |
607 | "request\n"); | |
608 | goto error; | |
609 | } | |
610 | ||
611 | res = lock->lockres; | |
612 | if (!res) { | |
613 | mlog(ML_ERROR, "NULL lockres pointer in convert " | |
614 | "request\n"); | |
615 | goto error; | |
616 | } | |
617 | dlm_lockres_get(res); | |
618 | ||
619 | /* XXX: for ocfs2 purposes, the ast/bast/astdata/lksb are | |
620 | * static after the original lock call. convert requests will | |
621 | * ensure that everything is the same, or return DLM_BADARGS. | |
622 | * this means that DLM_DENIED_NOASTS will never be returned. | |
623 | */ | |
624 | if (lock->lksb != lksb || lock->ast != ast || | |
625 | lock->bast != bast || lock->astdata != data) { | |
626 | status = DLM_BADARGS; | |
627 | mlog(ML_ERROR, "new args: lksb=%p, ast=%p, bast=%p, " | |
628 | "astdata=%p\n", lksb, ast, bast, data); | |
629 | mlog(ML_ERROR, "orig args: lksb=%p, ast=%p, bast=%p, " | |
630 | "astdata=%p\n", lock->lksb, lock->ast, | |
631 | lock->bast, lock->astdata); | |
632 | goto error; | |
633 | } | |
634 | retry_convert: | |
635 | dlm_wait_for_recovery(dlm); | |
636 | ||
637 | if (res->owner == dlm->node_num) | |
638 | status = dlmconvert_master(dlm, res, lock, flags, mode); | |
639 | else | |
640 | status = dlmconvert_remote(dlm, res, lock, flags, mode); | |
641 | if (status == DLM_RECOVERING || status == DLM_MIGRATING || | |
642 | status == DLM_FORWARD) { | |
643 | /* for now, see how this works without sleeping | |
644 | * and just retry right away. I suspect the reco | |
645 | * or migration will complete fast enough that | |
646 | * no waiting will be necessary */ | |
647 | mlog(0, "retrying convert with migration/recovery/" | |
648 | "in-progress\n"); | |
649 | msleep(100); | |
650 | goto retry_convert; | |
651 | } | |
652 | } else { | |
653 | u64 tmpcookie; | |
654 | ||
655 | /* LOCK request */ | |
656 | status = DLM_BADARGS; | |
657 | if (!name) { | |
658 | dlm_error(status); | |
659 | goto error; | |
660 | } | |
661 | ||
662 | status = DLM_IVBUFLEN; | |
3384f3df | 663 | if (namelen > DLM_LOCKID_NAME_MAX || namelen < 1) { |
6714d8e8 KH |
664 | dlm_error(status); |
665 | goto error; | |
666 | } | |
667 | ||
668 | dlm_get_next_cookie(dlm->node_num, &tmpcookie); | |
669 | lock = dlm_new_lock(mode, dlm->node_num, tmpcookie, lksb); | |
670 | if (!lock) { | |
671 | dlm_error(status); | |
672 | goto error; | |
673 | } | |
674 | ||
675 | if (!recovery) | |
676 | dlm_wait_for_recovery(dlm); | |
677 | ||
678 | /* find or create the lock resource */ | |
3384f3df | 679 | res = dlm_get_lock_resource(dlm, name, namelen, flags); |
6714d8e8 KH |
680 | if (!res) { |
681 | status = DLM_IVLOCKID; | |
682 | dlm_error(status); | |
683 | goto error; | |
684 | } | |
685 | ||
686 | mlog(0, "type=%d, flags = 0x%x\n", mode, flags); | |
687 | mlog(0, "creating lock: lock=%p res=%p\n", lock, res); | |
688 | ||
689 | dlm_lock_attach_lockres(lock, res); | |
690 | lock->ast = ast; | |
691 | lock->bast = bast; | |
692 | lock->astdata = data; | |
693 | ||
694 | retry_lock: | |
695 | if (flags & LKM_VALBLK) { | |
696 | mlog(0, "LKM_VALBLK passed by caller\n"); | |
697 | ||
698 | /* LVB requests for non PR, PW or EX locks are | |
699 | * ignored. */ | |
700 | if (mode < LKM_PRMODE) | |
701 | flags &= ~LKM_VALBLK; | |
702 | else { | |
703 | flags |= LKM_GET_LVB; | |
704 | lock->lksb->flags |= DLM_LKSB_GET_LVB; | |
705 | } | |
706 | } | |
707 | ||
708 | if (res->owner == dlm->node_num) | |
709 | status = dlmlock_master(dlm, res, lock, flags); | |
710 | else | |
711 | status = dlmlock_remote(dlm, res, lock, flags); | |
712 | ||
713 | if (status == DLM_RECOVERING || status == DLM_MIGRATING || | |
714 | status == DLM_FORWARD) { | |
6714d8e8 | 715 | msleep(100); |
44465a7d | 716 | if (recovery) { |
c8df412e KH |
717 | if (status != DLM_RECOVERING) |
718 | goto retry_lock; | |
c8df412e KH |
719 | /* wait to see the node go down, then |
720 | * drop down and allow the lockres to | |
721 | * get cleaned up. need to remaster. */ | |
722 | dlm_wait_for_node_death(dlm, res->owner, | |
723 | DLM_NODE_DEATH_WAIT_MAX); | |
44465a7d KH |
724 | } else { |
725 | dlm_wait_for_recovery(dlm); | |
c8df412e | 726 | goto retry_lock; |
44465a7d | 727 | } |
6714d8e8 KH |
728 | } |
729 | ||
ff0a522e SM |
730 | /* Inflight taken in dlm_get_lock_resource() is dropped here */ |
731 | spin_lock(&res->spinlock); | |
732 | dlm_lockres_drop_inflight_ref(dlm, res); | |
733 | spin_unlock(&res->spinlock); | |
734 | ||
735 | dlm_lockres_calc_usage(dlm, res); | |
736 | dlm_kick_thread(dlm, res); | |
737 | ||
6714d8e8 KH |
738 | if (status != DLM_NORMAL) { |
739 | lock->lksb->flags &= ~DLM_LKSB_GET_LVB; | |
740 | if (status != DLM_NOTQUEUED) | |
741 | dlm_error(status); | |
742 | goto error; | |
743 | } | |
744 | } | |
745 | ||
746 | error: | |
747 | if (status != DLM_NORMAL) { | |
748 | if (lock && !convert) | |
749 | dlm_lock_put(lock); | |
750 | // this is kind of unnecessary | |
751 | lksb->status = status; | |
752 | } | |
753 | ||
754 | /* put lockres ref from the convert path | |
755 | * or from dlm_get_lock_resource */ | |
756 | if (res) | |
757 | dlm_lockres_put(res); | |
758 | ||
759 | return status; | |
760 | } | |
761 | EXPORT_SYMBOL_GPL(dlmlock); |