Commit | Line | Data |
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328970de | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
fa60ce2c | 2 | /* |
6714d8e8 KH |
3 | * dlmlock.c |
4 | * | |
5 | * underlying calls for lock creation | |
6 | * | |
7 | * Copyright (C) 2004 Oracle. All rights reserved. | |
6714d8e8 KH |
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> | |
6714d8e8 KH |
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 | ||
ca322fb6 MY |
26 | #include "../cluster/heartbeat.h" |
27 | #include "../cluster/nodemanager.h" | |
28 | #include "../cluster/tcp.h" | |
6714d8e8 KH |
29 | |
30 | #include "dlmapi.h" | |
31 | #include "dlmcommon.h" | |
32 | ||
33 | #include "dlmconvert.h" | |
34 | ||
35 | #define MLOG_MASK_PREFIX ML_DLM | |
ca322fb6 | 36 | #include "../cluster/masklog.h" |
6714d8e8 | 37 | |
1a5c4e2a | 38 | static struct kmem_cache *dlm_lock_cache; |
724bdca9 | 39 | |
34af946a | 40 | static DEFINE_SPINLOCK(dlm_cookie_lock); |
6714d8e8 KH |
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 | ||
724bdca9 SM |
51 | int dlm_init_lock_cache(void) |
52 | { | |
53 | dlm_lock_cache = kmem_cache_create("o2dlm_lock", | |
54 | sizeof(struct dlm_lock), | |
55 | 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 | { | |
a17b485a | 63 | kmem_cache_destroy(dlm_lock_cache); |
724bdca9 SM |
64 | } |
65 | ||
6714d8e8 KH |
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 | { | |
6714d8e8 KH |
76 | struct dlm_lock *tmplock; |
77 | ||
df53cd3b | 78 | list_for_each_entry(tmplock, &res->granted, list) { |
6714d8e8 KH |
79 | if (!dlm_lock_compatible(tmplock->ml.type, lock->ml.type)) |
80 | return 0; | |
81 | } | |
82 | ||
df53cd3b | 83 | list_for_each_entry(tmplock, &res->converting, list) { |
6714d8e8 KH |
84 | if (!dlm_lock_compatible(tmplock->ml.type, lock->ml.type)) |
85 | return 0; | |
66f45005 WW |
86 | if (!dlm_lock_compatible(tmplock->ml.convert_type, |
87 | lock->ml.type)) | |
88 | return 0; | |
6714d8e8 KH |
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 | ||
ef6b689b | 108 | mlog(0, "type=%d\n", lock->ml.type); |
6714d8e8 KH |
109 | |
110 | spin_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(&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(&lock->list, &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(res->lockname.name, | |
138 | res->lockname.len)) { | |
139 | kick_thread = 1; | |
140 | call_ast = 1; | |
c03872f5 KH |
141 | } else { |
142 | mlog(0, "%s: returning DLM_NORMAL to " | |
143 | "node %u for reco lock\n", dlm->name, | |
144 | lock->ml.node); | |
6714d8e8 KH |
145 | } |
146 | } else { | |
147 | /* for NOQUEUE request, unless we get the | |
148 | * lock right away, return DLM_NOTQUEUED */ | |
c03872f5 | 149 | if (flags & LKM_NOQUEUE) { |
6714d8e8 | 150 | status = DLM_NOTQUEUED; |
c03872f5 KH |
151 | if (dlm_is_recovery_lock(res->lockname.name, |
152 | 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 { | |
096b2ef8 | 158 | status = DLM_NORMAL; |
6714d8e8 KH |
159 | dlm_lock_get(lock); |
160 | list_add_tail(&lock->list, &res->blocked); | |
161 | kick_thread = 1; | |
162 | } | |
163 | } | |
164 | ||
165 | spin_unlock(&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(&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; | |
2abaf97e | 202 | int lockres_changed = 1; |
6714d8e8 | 203 | |
ef6b689b TM |
204 | mlog(0, "type=%d, lockres %.*s, flags = 0x%x\n", |
205 | lock->ml.type, res->lockname.len, | |
6714d8e8 KH |
206 | res->lockname.name, flags); |
207 | ||
a2c0cc15 SM |
208 | /* |
209 | * Wait if resource is getting recovered, remastered, etc. | |
210 | * If the resource was remastered and new owner is self, then exit. | |
211 | */ | |
6714d8e8 | 212 | spin_lock(&res->spinlock); |
6714d8e8 | 213 | __dlm_wait_on_lockres(res); |
a2c0cc15 SM |
214 | if (res->owner == dlm->node_num) { |
215 | spin_unlock(&res->spinlock); | |
216 | return DLM_RECOVERING; | |
217 | } | |
6714d8e8 KH |
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(&lock->list, &res->blocked); | |
223 | lock->lock_pending = 1; | |
224 | spin_unlock(&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(&res->spinlock); | |
231 | res->state &= ~DLM_LOCK_RES_IN_PROGRESS; | |
232 | lock->lock_pending = 0; | |
233 | if (status != DLM_NORMAL) { | |
c8df412e KH |
234 | if (status == DLM_RECOVERING && |
235 | dlm_is_recovery_lock(res->lockname.name, | |
236 | 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) { | |
c87a9ae7 KH |
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; | |
6714d8e8 | 251 | dlm_error(status); |
c87a9ae7 | 252 | } |
6714d8e8 KH |
253 | dlm_revert_pending_lock(res, lock); |
254 | dlm_lock_put(lock); | |
2bd63216 | 255 | } else if (dlm_is_recovery_lock(res->lockname.name, |
558c70c5 KH |
256 | 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); | |
f116629d | 264 | list_move_tail(&lock->list, &res->granted); |
6714d8e8 KH |
265 | } |
266 | spin_unlock(&res->spinlock); | |
267 | ||
2abaf97e KH |
268 | if (lockres_changed) |
269 | dlm_lockres_calc_usage(dlm, res); | |
6714d8e8 KH |
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 | ||
6714d8e8 KH |
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(DLM_CREATE_LOCK_MSG, dlm->key, &create, | |
300 | sizeof(create), res->owner, &status); | |
301 | if (tmpret >= 0) { | |
8decab3c | 302 | ret = status; |
495ac96e | 303 | if (ret == DLM_REJECTED) { |
8decab3c SM |
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, | |
e4eb0368 KH |
307 | create.name, res->owner); |
308 | dlm_print_one_lock_resource(res); | |
309 | BUG(); | |
310 | } | |
6714d8e8 | 311 | } else { |
8decab3c SM |
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(tmpret)) | |
6714d8e8 | 316 | ret = DLM_RECOVERING; |
8decab3c | 317 | else |
6714d8e8 | 318 | ret = dlm_err_to_dlm_status(tmpret); |
6714d8e8 KH |
319 | } |
320 | ||
321 | return ret; | |
322 | } | |
323 | ||
324 | void dlm_lock_get(struct dlm_lock *lock) | |
325 | { | |
326 | kref_get(&lock->lock_refs); | |
327 | } | |
328 | ||
329 | void dlm_lock_put(struct dlm_lock *lock) | |
330 | { | |
331 | kref_put(&lock->lock_refs, 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(lock->lksb); | |
351 | } | |
724bdca9 | 352 | kmem_cache_free(dlm_lock_cache, lock); |
6714d8e8 KH |
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(&newlock->list); | |
380 | INIT_LIST_HEAD(&newlock->ast_list); | |
381 | INIT_LIST_HEAD(&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(&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 | ||
3914ed0c | 411 | lock = kmem_cache_zalloc(dlm_lock_cache, GFP_NOFS); |
6714d8e8 KH |
412 | if (!lock) |
413 | return NULL; | |
414 | ||
415 | if (!lksb) { | |
416 | /* zero memory only if kernel-allocated */ | |
cd861280 | 417 | lksb = kzalloc(sizeof(*lksb), GFP_NOFS); |
6714d8e8 | 418 | if (!lksb) { |
fc9f8994 | 419 | kmem_cache_free(dlm_lock_cache, lock); |
6714d8e8 KH |
420 | return NULL; |
421 | } | |
422 | kernel_allocated = 1; | |
423 | } | |
424 | ||
425 | dlm_init_lock(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 | */ | |
d74c9803 KH |
440 | int dlm_create_lock_handler(struct o2net_msg *msg, u32 len, void *data, |
441 | void **ret_data) | |
6714d8e8 KH |
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 | ||
6714d8e8 KH |
454 | if (!dlm_grab(dlm)) |
455 | return DLM_REJECTED; | |
456 | ||
6714d8e8 KH |
457 | name = create->name; |
458 | namelen = create->namelen; | |
495ac96e | 459 | status = DLM_REJECTED; |
e4eb0368 KH |
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 | } | |
6714d8e8 KH |
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(create->requested_type, | |
476 | 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, namelen); | |
492 | if (!res) { | |
493 | dlm_error(status); | |
494 | goto leave; | |
495 | } | |
496 | ||
497 | spin_lock(&res->spinlock); | |
498 | status = __dlm_lockres_state_to_status(res); | |
499 | spin_unlock(&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(newlock, res); | |
507 | ||
508 | status = dlmlock_master(dlm, res, newlock, be32_to_cpu(create->flags)); | |
509 | leave: | |
510 | if (status != DLM_NORMAL) | |
511 | if (newlock) | |
512 | dlm_lock_put(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(&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(&dlm_cookie_lock); | |
538 | } | |
539 | ||
540 | enum dlm_status dlmlock(struct dlm_ctxt *dlm, int mode, | |
541 | struct dlm_lockstatus *lksb, int flags, | |
3384f3df MF |
542 | const char *name, int namelen, dlm_astlockfunc_t *ast, |
543 | void *data, dlm_bastlockfunc_t *bast) | |
6714d8e8 KH |
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 && | |
3384f3df | 573 | (!dlm_is_recovery_lock(name, namelen) || convert) ) { |
6714d8e8 KH |
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, mode); | |
621 | else | |
622 | status = dlmconvert_remote(dlm, res, lock, flags, 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(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; | |
3384f3df | 645 | if (namelen > DLM_LOCKID_NAME_MAX || namelen < 1) { |
6714d8e8 KH |
646 | dlm_error(status); |
647 | goto error; | |
648 | } | |
649 | ||
650 | dlm_get_next_cookie(dlm->node_num, &tmpcookie); | |
651 | lock = dlm_new_lock(mode, dlm->node_num, 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 */ | |
3384f3df | 661 | res = dlm_get_lock_resource(dlm, name, namelen, flags); |
6714d8e8 KH |
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) { | |
6714d8e8 | 697 | msleep(100); |
44465a7d | 698 | if (recovery) { |
c8df412e KH |
699 | if (status != DLM_RECOVERING) |
700 | goto retry_lock; | |
c8df412e KH |
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, res->owner, | |
705 | DLM_NODE_DEATH_WAIT_MAX); | |
44465a7d KH |
706 | } else { |
707 | dlm_wait_for_recovery(dlm); | |
c8df412e | 708 | goto retry_lock; |
44465a7d | 709 | } |
6714d8e8 KH |
710 | } |
711 | ||
ff0a522e SM |
712 | /* Inflight taken in dlm_get_lock_resource() is dropped here */ |
713 | spin_lock(&res->spinlock); | |
714 | dlm_lockres_drop_inflight_ref(dlm, res); | |
715 | spin_unlock(&res->spinlock); | |
716 | ||
717 | dlm_lockres_calc_usage(dlm, res); | |
718 | dlm_kick_thread(dlm, res); | |
719 | ||
6714d8e8 KH |
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); |