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328970de | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
6714d8e8 KH |
2 | /* -*- mode: c; c-basic-offset: 8; -*- |
3 | * vim: noexpandtab sw=8 ts=8 sts=0: | |
4 | * | |
5 | * dlmlock.c | |
6 | * | |
7 | * underlying calls for lock creation | |
8 | * | |
9 | * Copyright (C) 2004 Oracle. All rights reserved. | |
6714d8e8 KH |
10 | */ |
11 | ||
12 | ||
13 | #include <linux/module.h> | |
14 | #include <linux/fs.h> | |
15 | #include <linux/types.h> | |
16 | #include <linux/slab.h> | |
17 | #include <linux/highmem.h> | |
6714d8e8 KH |
18 | #include <linux/init.h> |
19 | #include <linux/sysctl.h> | |
20 | #include <linux/random.h> | |
21 | #include <linux/blkdev.h> | |
22 | #include <linux/socket.h> | |
23 | #include <linux/inet.h> | |
24 | #include <linux/spinlock.h> | |
25 | #include <linux/delay.h> | |
26 | ||
27 | ||
ca322fb6 MY |
28 | #include "../cluster/heartbeat.h" |
29 | #include "../cluster/nodemanager.h" | |
30 | #include "../cluster/tcp.h" | |
6714d8e8 KH |
31 | |
32 | #include "dlmapi.h" | |
33 | #include "dlmcommon.h" | |
34 | ||
35 | #include "dlmconvert.h" | |
36 | ||
37 | #define MLOG_MASK_PREFIX ML_DLM | |
ca322fb6 | 38 | #include "../cluster/masklog.h" |
6714d8e8 | 39 | |
1a5c4e2a | 40 | static struct kmem_cache *dlm_lock_cache; |
724bdca9 | 41 | |
34af946a | 42 | static DEFINE_SPINLOCK(dlm_cookie_lock); |
6714d8e8 KH |
43 | static u64 dlm_next_cookie = 1; |
44 | ||
45 | static enum dlm_status dlm_send_remote_lock_request(struct dlm_ctxt *dlm, | |
46 | struct dlm_lock_resource *res, | |
47 | struct dlm_lock *lock, int flags); | |
48 | static void dlm_init_lock(struct dlm_lock *newlock, int type, | |
49 | u8 node, u64 cookie); | |
50 | static void dlm_lock_release(struct kref *kref); | |
51 | static void dlm_lock_detach_lockres(struct dlm_lock *lock); | |
52 | ||
724bdca9 SM |
53 | int dlm_init_lock_cache(void) |
54 | { | |
55 | dlm_lock_cache = kmem_cache_create("o2dlm_lock", | |
56 | sizeof(struct dlm_lock), | |
57 | 0, SLAB_HWCACHE_ALIGN, NULL); | |
58 | if (dlm_lock_cache == NULL) | |
59 | return -ENOMEM; | |
60 | return 0; | |
61 | } | |
62 | ||
63 | void dlm_destroy_lock_cache(void) | |
64 | { | |
a17b485a | 65 | kmem_cache_destroy(dlm_lock_cache); |
724bdca9 SM |
66 | } |
67 | ||
6714d8e8 KH |
68 | /* Tell us whether we can grant a new lock request. |
69 | * locking: | |
70 | * caller needs: res->spinlock | |
71 | * taken: none | |
72 | * held on exit: none | |
73 | * returns: 1 if the lock can be granted, 0 otherwise. | |
74 | */ | |
75 | static int dlm_can_grant_new_lock(struct dlm_lock_resource *res, | |
76 | struct dlm_lock *lock) | |
77 | { | |
6714d8e8 KH |
78 | struct dlm_lock *tmplock; |
79 | ||
df53cd3b | 80 | list_for_each_entry(tmplock, &res->granted, list) { |
6714d8e8 KH |
81 | if (!dlm_lock_compatible(tmplock->ml.type, lock->ml.type)) |
82 | return 0; | |
83 | } | |
84 | ||
df53cd3b | 85 | list_for_each_entry(tmplock, &res->converting, list) { |
6714d8e8 KH |
86 | if (!dlm_lock_compatible(tmplock->ml.type, lock->ml.type)) |
87 | return 0; | |
66f45005 WW |
88 | if (!dlm_lock_compatible(tmplock->ml.convert_type, |
89 | lock->ml.type)) | |
90 | return 0; | |
6714d8e8 KH |
91 | } |
92 | ||
93 | return 1; | |
94 | } | |
95 | ||
96 | /* performs lock creation at the lockres master site | |
97 | * locking: | |
98 | * caller needs: none | |
99 | * taken: takes and drops res->spinlock | |
100 | * held on exit: none | |
101 | * returns: DLM_NORMAL, DLM_NOTQUEUED | |
102 | */ | |
103 | static enum dlm_status dlmlock_master(struct dlm_ctxt *dlm, | |
104 | struct dlm_lock_resource *res, | |
105 | struct dlm_lock *lock, int flags) | |
106 | { | |
107 | int call_ast = 0, kick_thread = 0; | |
108 | enum dlm_status status = DLM_NORMAL; | |
109 | ||
ef6b689b | 110 | mlog(0, "type=%d\n", lock->ml.type); |
6714d8e8 KH |
111 | |
112 | spin_lock(&res->spinlock); | |
113 | /* if called from dlm_create_lock_handler, need to | |
114 | * ensure it will not sleep in dlm_wait_on_lockres */ | |
115 | status = __dlm_lockres_state_to_status(res); | |
116 | if (status != DLM_NORMAL && | |
117 | lock->ml.node != dlm->node_num) { | |
118 | /* erf. state changed after lock was dropped. */ | |
119 | spin_unlock(&res->spinlock); | |
120 | dlm_error(status); | |
121 | return status; | |
122 | } | |
123 | __dlm_wait_on_lockres(res); | |
124 | __dlm_lockres_reserve_ast(res); | |
125 | ||
126 | if (dlm_can_grant_new_lock(res, lock)) { | |
127 | mlog(0, "I can grant this lock right away\n"); | |
128 | /* got it right away */ | |
129 | lock->lksb->status = DLM_NORMAL; | |
130 | status = DLM_NORMAL; | |
131 | dlm_lock_get(lock); | |
132 | list_add_tail(&lock->list, &res->granted); | |
133 | ||
134 | /* for the recovery lock, we can't allow the ast | |
135 | * to be queued since the dlmthread is already | |
136 | * frozen. but the recovery lock is always locked | |
137 | * with LKM_NOQUEUE so we do not need the ast in | |
138 | * this special case */ | |
139 | if (!dlm_is_recovery_lock(res->lockname.name, | |
140 | res->lockname.len)) { | |
141 | kick_thread = 1; | |
142 | call_ast = 1; | |
c03872f5 KH |
143 | } else { |
144 | mlog(0, "%s: returning DLM_NORMAL to " | |
145 | "node %u for reco lock\n", dlm->name, | |
146 | lock->ml.node); | |
6714d8e8 KH |
147 | } |
148 | } else { | |
149 | /* for NOQUEUE request, unless we get the | |
150 | * lock right away, return DLM_NOTQUEUED */ | |
c03872f5 | 151 | if (flags & LKM_NOQUEUE) { |
6714d8e8 | 152 | status = DLM_NOTQUEUED; |
c03872f5 KH |
153 | if (dlm_is_recovery_lock(res->lockname.name, |
154 | res->lockname.len)) { | |
155 | mlog(0, "%s: returning NOTQUEUED to " | |
156 | "node %u for reco lock\n", dlm->name, | |
157 | lock->ml.node); | |
158 | } | |
159 | } else { | |
096b2ef8 | 160 | status = DLM_NORMAL; |
6714d8e8 KH |
161 | dlm_lock_get(lock); |
162 | list_add_tail(&lock->list, &res->blocked); | |
163 | kick_thread = 1; | |
164 | } | |
165 | } | |
166 | ||
167 | spin_unlock(&res->spinlock); | |
168 | wake_up(&res->wq); | |
169 | ||
170 | /* either queue the ast or release it */ | |
171 | if (call_ast) | |
172 | dlm_queue_ast(dlm, lock); | |
173 | else | |
174 | dlm_lockres_release_ast(dlm, res); | |
175 | ||
176 | dlm_lockres_calc_usage(dlm, res); | |
177 | if (kick_thread) | |
178 | dlm_kick_thread(dlm, res); | |
179 | ||
180 | return status; | |
181 | } | |
182 | ||
183 | void dlm_revert_pending_lock(struct dlm_lock_resource *res, | |
184 | struct dlm_lock *lock) | |
185 | { | |
186 | /* remove from local queue if it failed */ | |
187 | list_del_init(&lock->list); | |
188 | lock->lksb->flags &= ~DLM_LKSB_GET_LVB; | |
189 | } | |
190 | ||
191 | ||
192 | /* | |
193 | * locking: | |
194 | * caller needs: none | |
195 | * taken: takes and drops res->spinlock | |
196 | * held on exit: none | |
197 | * returns: DLM_DENIED, DLM_RECOVERING, or net status | |
198 | */ | |
199 | static enum dlm_status dlmlock_remote(struct dlm_ctxt *dlm, | |
200 | struct dlm_lock_resource *res, | |
201 | struct dlm_lock *lock, int flags) | |
202 | { | |
203 | enum dlm_status status = DLM_DENIED; | |
2abaf97e | 204 | int lockres_changed = 1; |
6714d8e8 | 205 | |
ef6b689b TM |
206 | mlog(0, "type=%d, lockres %.*s, flags = 0x%x\n", |
207 | lock->ml.type, res->lockname.len, | |
6714d8e8 KH |
208 | res->lockname.name, flags); |
209 | ||
a2c0cc15 SM |
210 | /* |
211 | * Wait if resource is getting recovered, remastered, etc. | |
212 | * If the resource was remastered and new owner is self, then exit. | |
213 | */ | |
6714d8e8 | 214 | spin_lock(&res->spinlock); |
6714d8e8 | 215 | __dlm_wait_on_lockres(res); |
a2c0cc15 SM |
216 | if (res->owner == dlm->node_num) { |
217 | spin_unlock(&res->spinlock); | |
218 | return DLM_RECOVERING; | |
219 | } | |
6714d8e8 KH |
220 | res->state |= DLM_LOCK_RES_IN_PROGRESS; |
221 | ||
222 | /* add lock to local (secondary) queue */ | |
223 | dlm_lock_get(lock); | |
224 | list_add_tail(&lock->list, &res->blocked); | |
225 | lock->lock_pending = 1; | |
226 | spin_unlock(&res->spinlock); | |
227 | ||
228 | /* spec seems to say that you will get DLM_NORMAL when the lock | |
229 | * has been queued, meaning we need to wait for a reply here. */ | |
230 | status = dlm_send_remote_lock_request(dlm, res, lock, flags); | |
231 | ||
232 | spin_lock(&res->spinlock); | |
233 | res->state &= ~DLM_LOCK_RES_IN_PROGRESS; | |
234 | lock->lock_pending = 0; | |
235 | if (status != DLM_NORMAL) { | |
c8df412e KH |
236 | if (status == DLM_RECOVERING && |
237 | dlm_is_recovery_lock(res->lockname.name, | |
238 | res->lockname.len)) { | |
239 | /* recovery lock was mastered by dead node. | |
240 | * we need to have calc_usage shoot down this | |
241 | * lockres and completely remaster it. */ | |
242 | mlog(0, "%s: recovery lock was owned by " | |
243 | "dead node %u, remaster it now.\n", | |
244 | dlm->name, res->owner); | |
245 | } else if (status != DLM_NOTQUEUED) { | |
c87a9ae7 KH |
246 | /* |
247 | * DO NOT call calc_usage, as this would unhash | |
248 | * the remote lockres before we ever get to use | |
249 | * it. treat as if we never made any change to | |
250 | * the lockres. | |
251 | */ | |
252 | lockres_changed = 0; | |
6714d8e8 | 253 | dlm_error(status); |
c87a9ae7 | 254 | } |
6714d8e8 KH |
255 | dlm_revert_pending_lock(res, lock); |
256 | dlm_lock_put(lock); | |
2bd63216 | 257 | } else if (dlm_is_recovery_lock(res->lockname.name, |
558c70c5 KH |
258 | res->lockname.len)) { |
259 | /* special case for the $RECOVERY lock. | |
260 | * there will never be an AST delivered to put | |
261 | * this lock on the proper secondary queue | |
262 | * (granted), so do it manually. */ | |
263 | mlog(0, "%s: $RECOVERY lock for this node (%u) is " | |
264 | "mastered by %u; got lock, manually granting (no ast)\n", | |
265 | dlm->name, dlm->node_num, res->owner); | |
f116629d | 266 | list_move_tail(&lock->list, &res->granted); |
6714d8e8 KH |
267 | } |
268 | spin_unlock(&res->spinlock); | |
269 | ||
2abaf97e KH |
270 | if (lockres_changed) |
271 | dlm_lockres_calc_usage(dlm, res); | |
6714d8e8 KH |
272 | |
273 | wake_up(&res->wq); | |
274 | return status; | |
275 | } | |
276 | ||
277 | ||
278 | /* for remote lock creation. | |
279 | * locking: | |
280 | * caller needs: none, but need res->state & DLM_LOCK_RES_IN_PROGRESS | |
281 | * taken: none | |
282 | * held on exit: none | |
283 | * returns: DLM_NOLOCKMGR, or net status | |
284 | */ | |
285 | static enum dlm_status dlm_send_remote_lock_request(struct dlm_ctxt *dlm, | |
286 | struct dlm_lock_resource *res, | |
287 | struct dlm_lock *lock, int flags) | |
288 | { | |
289 | struct dlm_create_lock create; | |
290 | int tmpret, status = 0; | |
291 | enum dlm_status ret; | |
292 | ||
6714d8e8 KH |
293 | memset(&create, 0, sizeof(create)); |
294 | create.node_idx = dlm->node_num; | |
295 | create.requested_type = lock->ml.type; | |
296 | create.cookie = lock->ml.cookie; | |
297 | create.namelen = res->lockname.len; | |
298 | create.flags = cpu_to_be32(flags); | |
299 | memcpy(create.name, res->lockname.name, create.namelen); | |
300 | ||
301 | tmpret = o2net_send_message(DLM_CREATE_LOCK_MSG, dlm->key, &create, | |
302 | sizeof(create), res->owner, &status); | |
303 | if (tmpret >= 0) { | |
8decab3c | 304 | ret = status; |
495ac96e | 305 | if (ret == DLM_REJECTED) { |
8decab3c SM |
306 | mlog(ML_ERROR, "%s: res %.*s, Stale lockres no longer " |
307 | "owned by node %u. That node is coming back up " | |
308 | "currently.\n", dlm->name, create.namelen, | |
e4eb0368 KH |
309 | create.name, res->owner); |
310 | dlm_print_one_lock_resource(res); | |
311 | BUG(); | |
312 | } | |
6714d8e8 | 313 | } else { |
8decab3c SM |
314 | mlog(ML_ERROR, "%s: res %.*s, Error %d send CREATE LOCK to " |
315 | "node %u\n", dlm->name, create.namelen, create.name, | |
316 | tmpret, res->owner); | |
317 | if (dlm_is_host_down(tmpret)) | |
6714d8e8 | 318 | ret = DLM_RECOVERING; |
8decab3c | 319 | else |
6714d8e8 | 320 | ret = dlm_err_to_dlm_status(tmpret); |
6714d8e8 KH |
321 | } |
322 | ||
323 | return ret; | |
324 | } | |
325 | ||
326 | void dlm_lock_get(struct dlm_lock *lock) | |
327 | { | |
328 | kref_get(&lock->lock_refs); | |
329 | } | |
330 | ||
331 | void dlm_lock_put(struct dlm_lock *lock) | |
332 | { | |
333 | kref_put(&lock->lock_refs, dlm_lock_release); | |
334 | } | |
335 | ||
336 | static void dlm_lock_release(struct kref *kref) | |
337 | { | |
338 | struct dlm_lock *lock; | |
339 | ||
340 | lock = container_of(kref, struct dlm_lock, lock_refs); | |
341 | ||
342 | BUG_ON(!list_empty(&lock->list)); | |
343 | BUG_ON(!list_empty(&lock->ast_list)); | |
344 | BUG_ON(!list_empty(&lock->bast_list)); | |
345 | BUG_ON(lock->ast_pending); | |
346 | BUG_ON(lock->bast_pending); | |
347 | ||
348 | dlm_lock_detach_lockres(lock); | |
349 | ||
350 | if (lock->lksb_kernel_allocated) { | |
351 | mlog(0, "freeing kernel-allocated lksb\n"); | |
352 | kfree(lock->lksb); | |
353 | } | |
724bdca9 | 354 | kmem_cache_free(dlm_lock_cache, lock); |
6714d8e8 KH |
355 | } |
356 | ||
357 | /* associate a lock with it's lockres, getting a ref on the lockres */ | |
358 | void dlm_lock_attach_lockres(struct dlm_lock *lock, | |
359 | struct dlm_lock_resource *res) | |
360 | { | |
361 | dlm_lockres_get(res); | |
362 | lock->lockres = res; | |
363 | } | |
364 | ||
365 | /* drop ref on lockres, if there is still one associated with lock */ | |
366 | static void dlm_lock_detach_lockres(struct dlm_lock *lock) | |
367 | { | |
368 | struct dlm_lock_resource *res; | |
369 | ||
370 | res = lock->lockres; | |
371 | if (res) { | |
372 | lock->lockres = NULL; | |
373 | mlog(0, "removing lock's lockres reference\n"); | |
374 | dlm_lockres_put(res); | |
375 | } | |
376 | } | |
377 | ||
378 | static void dlm_init_lock(struct dlm_lock *newlock, int type, | |
379 | u8 node, u64 cookie) | |
380 | { | |
381 | INIT_LIST_HEAD(&newlock->list); | |
382 | INIT_LIST_HEAD(&newlock->ast_list); | |
383 | INIT_LIST_HEAD(&newlock->bast_list); | |
384 | spin_lock_init(&newlock->spinlock); | |
385 | newlock->ml.type = type; | |
386 | newlock->ml.convert_type = LKM_IVMODE; | |
387 | newlock->ml.highest_blocked = LKM_IVMODE; | |
388 | newlock->ml.node = node; | |
389 | newlock->ml.pad1 = 0; | |
390 | newlock->ml.list = 0; | |
391 | newlock->ml.flags = 0; | |
392 | newlock->ast = NULL; | |
393 | newlock->bast = NULL; | |
394 | newlock->astdata = NULL; | |
395 | newlock->ml.cookie = cpu_to_be64(cookie); | |
396 | newlock->ast_pending = 0; | |
397 | newlock->bast_pending = 0; | |
398 | newlock->convert_pending = 0; | |
399 | newlock->lock_pending = 0; | |
400 | newlock->unlock_pending = 0; | |
401 | newlock->cancel_pending = 0; | |
402 | newlock->lksb_kernel_allocated = 0; | |
403 | ||
404 | kref_init(&newlock->lock_refs); | |
405 | } | |
406 | ||
407 | struct dlm_lock * dlm_new_lock(int type, u8 node, u64 cookie, | |
408 | struct dlm_lockstatus *lksb) | |
409 | { | |
410 | struct dlm_lock *lock; | |
411 | int kernel_allocated = 0; | |
412 | ||
3914ed0c | 413 | lock = kmem_cache_zalloc(dlm_lock_cache, GFP_NOFS); |
6714d8e8 KH |
414 | if (!lock) |
415 | return NULL; | |
416 | ||
417 | if (!lksb) { | |
418 | /* zero memory only if kernel-allocated */ | |
cd861280 | 419 | lksb = kzalloc(sizeof(*lksb), GFP_NOFS); |
6714d8e8 | 420 | if (!lksb) { |
fc9f8994 | 421 | kmem_cache_free(dlm_lock_cache, lock); |
6714d8e8 KH |
422 | return NULL; |
423 | } | |
424 | kernel_allocated = 1; | |
425 | } | |
426 | ||
427 | dlm_init_lock(lock, type, node, cookie); | |
428 | if (kernel_allocated) | |
429 | lock->lksb_kernel_allocated = 1; | |
430 | lock->lksb = lksb; | |
431 | lksb->lockid = lock; | |
432 | return lock; | |
433 | } | |
434 | ||
435 | /* handler for lock creation net message | |
436 | * locking: | |
437 | * caller needs: none | |
438 | * taken: takes and drops res->spinlock | |
439 | * held on exit: none | |
440 | * returns: DLM_NORMAL, DLM_SYSERR, DLM_IVLOCKID, DLM_NOTQUEUED | |
441 | */ | |
d74c9803 KH |
442 | int dlm_create_lock_handler(struct o2net_msg *msg, u32 len, void *data, |
443 | void **ret_data) | |
6714d8e8 KH |
444 | { |
445 | struct dlm_ctxt *dlm = data; | |
446 | struct dlm_create_lock *create = (struct dlm_create_lock *)msg->buf; | |
447 | struct dlm_lock_resource *res = NULL; | |
448 | struct dlm_lock *newlock = NULL; | |
449 | struct dlm_lockstatus *lksb = NULL; | |
450 | enum dlm_status status = DLM_NORMAL; | |
451 | char *name; | |
452 | unsigned int namelen; | |
453 | ||
454 | BUG_ON(!dlm); | |
455 | ||
6714d8e8 KH |
456 | if (!dlm_grab(dlm)) |
457 | return DLM_REJECTED; | |
458 | ||
6714d8e8 KH |
459 | name = create->name; |
460 | namelen = create->namelen; | |
495ac96e | 461 | status = DLM_REJECTED; |
e4eb0368 KH |
462 | if (!dlm_domain_fully_joined(dlm)) { |
463 | mlog(ML_ERROR, "Domain %s not fully joined, but node %u is " | |
464 | "sending a create_lock message for lock %.*s!\n", | |
465 | dlm->name, create->node_idx, namelen, name); | |
466 | dlm_error(status); | |
467 | goto leave; | |
468 | } | |
6714d8e8 KH |
469 | |
470 | status = DLM_IVBUFLEN; | |
471 | if (namelen > DLM_LOCKID_NAME_MAX) { | |
472 | dlm_error(status); | |
473 | goto leave; | |
474 | } | |
475 | ||
476 | status = DLM_SYSERR; | |
477 | newlock = dlm_new_lock(create->requested_type, | |
478 | create->node_idx, | |
479 | be64_to_cpu(create->cookie), NULL); | |
480 | if (!newlock) { | |
481 | dlm_error(status); | |
482 | goto leave; | |
483 | } | |
484 | ||
485 | lksb = newlock->lksb; | |
486 | ||
487 | if (be32_to_cpu(create->flags) & LKM_GET_LVB) { | |
488 | lksb->flags |= DLM_LKSB_GET_LVB; | |
489 | mlog(0, "set DLM_LKSB_GET_LVB flag\n"); | |
490 | } | |
491 | ||
492 | status = DLM_IVLOCKID; | |
493 | res = dlm_lookup_lockres(dlm, name, namelen); | |
494 | if (!res) { | |
495 | dlm_error(status); | |
496 | goto leave; | |
497 | } | |
498 | ||
499 | spin_lock(&res->spinlock); | |
500 | status = __dlm_lockres_state_to_status(res); | |
501 | spin_unlock(&res->spinlock); | |
502 | ||
503 | if (status != DLM_NORMAL) { | |
504 | mlog(0, "lockres recovering/migrating/in-progress\n"); | |
505 | goto leave; | |
506 | } | |
507 | ||
508 | dlm_lock_attach_lockres(newlock, res); | |
509 | ||
510 | status = dlmlock_master(dlm, res, newlock, be32_to_cpu(create->flags)); | |
511 | leave: | |
512 | if (status != DLM_NORMAL) | |
513 | if (newlock) | |
514 | dlm_lock_put(newlock); | |
515 | ||
516 | if (res) | |
517 | dlm_lockres_put(res); | |
518 | ||
519 | dlm_put(dlm); | |
520 | ||
521 | return status; | |
522 | } | |
523 | ||
524 | ||
525 | /* fetch next node-local (u8 nodenum + u56 cookie) into u64 */ | |
526 | static inline void dlm_get_next_cookie(u8 node_num, u64 *cookie) | |
527 | { | |
528 | u64 tmpnode = node_num; | |
529 | ||
530 | /* shift single byte of node num into top 8 bits */ | |
531 | tmpnode <<= 56; | |
532 | ||
533 | spin_lock(&dlm_cookie_lock); | |
534 | *cookie = (dlm_next_cookie | tmpnode); | |
535 | if (++dlm_next_cookie & 0xff00000000000000ull) { | |
536 | mlog(0, "This node's cookie will now wrap!\n"); | |
537 | dlm_next_cookie = 1; | |
538 | } | |
539 | spin_unlock(&dlm_cookie_lock); | |
540 | } | |
541 | ||
542 | enum dlm_status dlmlock(struct dlm_ctxt *dlm, int mode, | |
543 | struct dlm_lockstatus *lksb, int flags, | |
3384f3df MF |
544 | const char *name, int namelen, dlm_astlockfunc_t *ast, |
545 | void *data, dlm_bastlockfunc_t *bast) | |
6714d8e8 KH |
546 | { |
547 | enum dlm_status status; | |
548 | struct dlm_lock_resource *res = NULL; | |
549 | struct dlm_lock *lock = NULL; | |
550 | int convert = 0, recovery = 0; | |
551 | ||
552 | /* yes this function is a mess. | |
553 | * TODO: clean this up. lots of common code in the | |
554 | * lock and convert paths, especially in the retry blocks */ | |
555 | if (!lksb) { | |
556 | dlm_error(DLM_BADARGS); | |
557 | return DLM_BADARGS; | |
558 | } | |
559 | ||
560 | status = DLM_BADPARAM; | |
561 | if (mode != LKM_EXMODE && mode != LKM_PRMODE && mode != LKM_NLMODE) { | |
562 | dlm_error(status); | |
563 | goto error; | |
564 | } | |
565 | ||
566 | if (flags & ~LKM_VALID_FLAGS) { | |
567 | dlm_error(status); | |
568 | goto error; | |
569 | } | |
570 | ||
571 | convert = (flags & LKM_CONVERT); | |
572 | recovery = (flags & LKM_RECOVERY); | |
573 | ||
574 | if (recovery && | |
3384f3df | 575 | (!dlm_is_recovery_lock(name, namelen) || convert) ) { |
6714d8e8 KH |
576 | dlm_error(status); |
577 | goto error; | |
578 | } | |
579 | if (convert && (flags & LKM_LOCAL)) { | |
580 | mlog(ML_ERROR, "strange LOCAL convert request!\n"); | |
581 | goto error; | |
582 | } | |
583 | ||
584 | if (convert) { | |
585 | /* CONVERT request */ | |
586 | ||
587 | /* if converting, must pass in a valid dlm_lock */ | |
588 | lock = lksb->lockid; | |
589 | if (!lock) { | |
590 | mlog(ML_ERROR, "NULL lock pointer in convert " | |
591 | "request\n"); | |
592 | goto error; | |
593 | } | |
594 | ||
595 | res = lock->lockres; | |
596 | if (!res) { | |
597 | mlog(ML_ERROR, "NULL lockres pointer in convert " | |
598 | "request\n"); | |
599 | goto error; | |
600 | } | |
601 | dlm_lockres_get(res); | |
602 | ||
603 | /* XXX: for ocfs2 purposes, the ast/bast/astdata/lksb are | |
604 | * static after the original lock call. convert requests will | |
605 | * ensure that everything is the same, or return DLM_BADARGS. | |
606 | * this means that DLM_DENIED_NOASTS will never be returned. | |
607 | */ | |
608 | if (lock->lksb != lksb || lock->ast != ast || | |
609 | lock->bast != bast || lock->astdata != data) { | |
610 | status = DLM_BADARGS; | |
611 | mlog(ML_ERROR, "new args: lksb=%p, ast=%p, bast=%p, " | |
612 | "astdata=%p\n", lksb, ast, bast, data); | |
613 | mlog(ML_ERROR, "orig args: lksb=%p, ast=%p, bast=%p, " | |
614 | "astdata=%p\n", lock->lksb, lock->ast, | |
615 | lock->bast, lock->astdata); | |
616 | goto error; | |
617 | } | |
618 | retry_convert: | |
619 | dlm_wait_for_recovery(dlm); | |
620 | ||
621 | if (res->owner == dlm->node_num) | |
622 | status = dlmconvert_master(dlm, res, lock, flags, mode); | |
623 | else | |
624 | status = dlmconvert_remote(dlm, res, lock, flags, mode); | |
625 | if (status == DLM_RECOVERING || status == DLM_MIGRATING || | |
626 | status == DLM_FORWARD) { | |
627 | /* for now, see how this works without sleeping | |
628 | * and just retry right away. I suspect the reco | |
629 | * or migration will complete fast enough that | |
630 | * no waiting will be necessary */ | |
631 | mlog(0, "retrying convert with migration/recovery/" | |
632 | "in-progress\n"); | |
633 | msleep(100); | |
634 | goto retry_convert; | |
635 | } | |
636 | } else { | |
637 | u64 tmpcookie; | |
638 | ||
639 | /* LOCK request */ | |
640 | status = DLM_BADARGS; | |
641 | if (!name) { | |
642 | dlm_error(status); | |
643 | goto error; | |
644 | } | |
645 | ||
646 | status = DLM_IVBUFLEN; | |
3384f3df | 647 | if (namelen > DLM_LOCKID_NAME_MAX || namelen < 1) { |
6714d8e8 KH |
648 | dlm_error(status); |
649 | goto error; | |
650 | } | |
651 | ||
652 | dlm_get_next_cookie(dlm->node_num, &tmpcookie); | |
653 | lock = dlm_new_lock(mode, dlm->node_num, tmpcookie, lksb); | |
654 | if (!lock) { | |
655 | dlm_error(status); | |
656 | goto error; | |
657 | } | |
658 | ||
659 | if (!recovery) | |
660 | dlm_wait_for_recovery(dlm); | |
661 | ||
662 | /* find or create the lock resource */ | |
3384f3df | 663 | res = dlm_get_lock_resource(dlm, name, namelen, flags); |
6714d8e8 KH |
664 | if (!res) { |
665 | status = DLM_IVLOCKID; | |
666 | dlm_error(status); | |
667 | goto error; | |
668 | } | |
669 | ||
670 | mlog(0, "type=%d, flags = 0x%x\n", mode, flags); | |
671 | mlog(0, "creating lock: lock=%p res=%p\n", lock, res); | |
672 | ||
673 | dlm_lock_attach_lockres(lock, res); | |
674 | lock->ast = ast; | |
675 | lock->bast = bast; | |
676 | lock->astdata = data; | |
677 | ||
678 | retry_lock: | |
679 | if (flags & LKM_VALBLK) { | |
680 | mlog(0, "LKM_VALBLK passed by caller\n"); | |
681 | ||
682 | /* LVB requests for non PR, PW or EX locks are | |
683 | * ignored. */ | |
684 | if (mode < LKM_PRMODE) | |
685 | flags &= ~LKM_VALBLK; | |
686 | else { | |
687 | flags |= LKM_GET_LVB; | |
688 | lock->lksb->flags |= DLM_LKSB_GET_LVB; | |
689 | } | |
690 | } | |
691 | ||
692 | if (res->owner == dlm->node_num) | |
693 | status = dlmlock_master(dlm, res, lock, flags); | |
694 | else | |
695 | status = dlmlock_remote(dlm, res, lock, flags); | |
696 | ||
697 | if (status == DLM_RECOVERING || status == DLM_MIGRATING || | |
698 | status == DLM_FORWARD) { | |
6714d8e8 | 699 | msleep(100); |
44465a7d | 700 | if (recovery) { |
c8df412e KH |
701 | if (status != DLM_RECOVERING) |
702 | goto retry_lock; | |
c8df412e KH |
703 | /* wait to see the node go down, then |
704 | * drop down and allow the lockres to | |
705 | * get cleaned up. need to remaster. */ | |
706 | dlm_wait_for_node_death(dlm, res->owner, | |
707 | DLM_NODE_DEATH_WAIT_MAX); | |
44465a7d KH |
708 | } else { |
709 | dlm_wait_for_recovery(dlm); | |
c8df412e | 710 | goto retry_lock; |
44465a7d | 711 | } |
6714d8e8 KH |
712 | } |
713 | ||
ff0a522e SM |
714 | /* Inflight taken in dlm_get_lock_resource() is dropped here */ |
715 | spin_lock(&res->spinlock); | |
716 | dlm_lockres_drop_inflight_ref(dlm, res); | |
717 | spin_unlock(&res->spinlock); | |
718 | ||
719 | dlm_lockres_calc_usage(dlm, res); | |
720 | dlm_kick_thread(dlm, res); | |
721 | ||
6714d8e8 KH |
722 | if (status != DLM_NORMAL) { |
723 | lock->lksb->flags &= ~DLM_LKSB_GET_LVB; | |
724 | if (status != DLM_NOTQUEUED) | |
725 | dlm_error(status); | |
726 | goto error; | |
727 | } | |
728 | } | |
729 | ||
730 | error: | |
731 | if (status != DLM_NORMAL) { | |
732 | if (lock && !convert) | |
733 | dlm_lock_put(lock); | |
734 | // this is kind of unnecessary | |
735 | lksb->status = status; | |
736 | } | |
737 | ||
738 | /* put lockres ref from the convert path | |
739 | * or from dlm_get_lock_resource */ | |
740 | if (res) | |
741 | dlm_lockres_put(res); | |
742 | ||
743 | return status; | |
744 | } | |
745 | EXPORT_SYMBOL_GPL(dlmlock); |