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328970de | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
fa60ce2c | 2 | /* |
6714d8e8 KH |
3 | * dlmconvert.c |
4 | * | |
5 | * underlying calls for lock conversion | |
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> | |
6714d8e8 | 14 | #include <linux/highmem.h> |
6714d8e8 KH |
15 | #include <linux/init.h> |
16 | #include <linux/sysctl.h> | |
17 | #include <linux/random.h> | |
18 | #include <linux/blkdev.h> | |
19 | #include <linux/socket.h> | |
20 | #include <linux/inet.h> | |
21 | #include <linux/spinlock.h> | |
22 | ||
23 | ||
ca322fb6 MY |
24 | #include "../cluster/heartbeat.h" |
25 | #include "../cluster/nodemanager.h" | |
26 | #include "../cluster/tcp.h" | |
6714d8e8 KH |
27 | |
28 | #include "dlmapi.h" | |
29 | #include "dlmcommon.h" | |
30 | ||
31 | #include "dlmconvert.h" | |
32 | ||
33 | #define MLOG_MASK_PREFIX ML_DLM | |
ca322fb6 | 34 | #include "../cluster/masklog.h" |
6714d8e8 KH |
35 | |
36 | /* NOTE: __dlmconvert_master is the only function in here that | |
37 | * needs a spinlock held on entry (res->spinlock) and it is the | |
38 | * only one that holds a lock on exit (res->spinlock). | |
39 | * All other functions in here need no locks and drop all of | |
40 | * the locks that they acquire. */ | |
41 | static enum dlm_status __dlmconvert_master(struct dlm_ctxt *dlm, | |
42 | struct dlm_lock_resource *res, | |
43 | struct dlm_lock *lock, int flags, | |
44 | int type, int *call_ast, | |
45 | int *kick_thread); | |
46 | static enum dlm_status dlm_send_remote_convert_request(struct dlm_ctxt *dlm, | |
47 | struct dlm_lock_resource *res, | |
48 | struct dlm_lock *lock, int flags, int type); | |
49 | ||
50 | /* | |
51 | * this is only called directly by dlmlock(), and only when the | |
52 | * local node is the owner of the lockres | |
53 | * locking: | |
54 | * caller needs: none | |
55 | * taken: takes and drops res->spinlock | |
56 | * held on exit: none | |
57 | * returns: see __dlmconvert_master | |
58 | */ | |
59 | enum dlm_status dlmconvert_master(struct dlm_ctxt *dlm, | |
60 | struct dlm_lock_resource *res, | |
61 | struct dlm_lock *lock, int flags, int type) | |
62 | { | |
63 | int call_ast = 0, kick_thread = 0; | |
64 | enum dlm_status status; | |
65 | ||
66 | spin_lock(&res->spinlock); | |
67 | /* we are not in a network handler, this is fine */ | |
68 | __dlm_wait_on_lockres(res); | |
69 | __dlm_lockres_reserve_ast(res); | |
70 | res->state |= DLM_LOCK_RES_IN_PROGRESS; | |
71 | ||
72 | status = __dlmconvert_master(dlm, res, lock, flags, type, | |
73 | &call_ast, &kick_thread); | |
74 | ||
75 | res->state &= ~DLM_LOCK_RES_IN_PROGRESS; | |
76 | spin_unlock(&res->spinlock); | |
77 | wake_up(&res->wq); | |
78 | if (status != DLM_NORMAL && status != DLM_NOTQUEUED) | |
79 | dlm_error(status); | |
80 | ||
81 | /* either queue the ast or release it */ | |
82 | if (call_ast) | |
83 | dlm_queue_ast(dlm, lock); | |
84 | else | |
85 | dlm_lockres_release_ast(dlm, res); | |
86 | ||
87 | if (kick_thread) | |
88 | dlm_kick_thread(dlm, res); | |
89 | ||
90 | return status; | |
91 | } | |
92 | ||
93 | /* performs lock conversion at the lockres master site | |
94 | * locking: | |
95 | * caller needs: res->spinlock | |
96 | * taken: takes and drops lock->spinlock | |
97 | * held on exit: res->spinlock | |
98 | * returns: DLM_NORMAL, DLM_NOTQUEUED, DLM_DENIED | |
99 | * call_ast: whether ast should be called for this lock | |
100 | * kick_thread: whether dlm_kick_thread should be called | |
101 | */ | |
102 | static enum dlm_status __dlmconvert_master(struct dlm_ctxt *dlm, | |
103 | struct dlm_lock_resource *res, | |
104 | struct dlm_lock *lock, int flags, | |
105 | int type, int *call_ast, | |
106 | int *kick_thread) | |
107 | { | |
108 | enum dlm_status status = DLM_NORMAL; | |
6714d8e8 KH |
109 | struct dlm_lock *tmplock=NULL; |
110 | ||
111 | assert_spin_locked(&res->spinlock); | |
112 | ||
ef6b689b TM |
113 | mlog(0, "type=%d, convert_type=%d, new convert_type=%d\n", |
114 | lock->ml.type, lock->ml.convert_type, type); | |
6714d8e8 KH |
115 | |
116 | spin_lock(&lock->spinlock); | |
117 | ||
118 | /* already converting? */ | |
119 | if (lock->ml.convert_type != LKM_IVMODE) { | |
120 | mlog(ML_ERROR, "attempted to convert a lock with a lock " | |
121 | "conversion pending\n"); | |
122 | status = DLM_DENIED; | |
123 | goto unlock_exit; | |
124 | } | |
125 | ||
126 | /* must be on grant queue to convert */ | |
127 | if (!dlm_lock_on_list(&res->granted, lock)) { | |
128 | mlog(ML_ERROR, "attempted to convert a lock not on grant " | |
129 | "queue\n"); | |
130 | status = DLM_DENIED; | |
131 | goto unlock_exit; | |
132 | } | |
133 | ||
134 | if (flags & LKM_VALBLK) { | |
135 | switch (lock->ml.type) { | |
136 | case LKM_EXMODE: | |
137 | /* EX + LKM_VALBLK + convert == set lvb */ | |
138 | mlog(0, "will set lvb: converting %s->%s\n", | |
139 | dlm_lock_mode_name(lock->ml.type), | |
140 | dlm_lock_mode_name(type)); | |
141 | lock->lksb->flags |= DLM_LKSB_PUT_LVB; | |
142 | break; | |
143 | case LKM_PRMODE: | |
144 | case LKM_NLMODE: | |
145 | /* refetch if new level is not NL */ | |
146 | if (type > LKM_NLMODE) { | |
147 | mlog(0, "will fetch new value into " | |
148 | "lvb: converting %s->%s\n", | |
149 | dlm_lock_mode_name(lock->ml.type), | |
150 | dlm_lock_mode_name(type)); | |
151 | lock->lksb->flags |= DLM_LKSB_GET_LVB; | |
152 | } else { | |
153 | mlog(0, "will NOT fetch new value " | |
154 | "into lvb: converting %s->%s\n", | |
155 | dlm_lock_mode_name(lock->ml.type), | |
156 | dlm_lock_mode_name(type)); | |
157 | flags &= ~(LKM_VALBLK); | |
158 | } | |
159 | break; | |
160 | } | |
161 | } | |
162 | ||
163 | ||
164 | /* in-place downconvert? */ | |
165 | if (type <= lock->ml.type) | |
166 | goto grant; | |
167 | ||
168 | /* upconvert from here on */ | |
169 | status = DLM_NORMAL; | |
df53cd3b | 170 | list_for_each_entry(tmplock, &res->granted, list) { |
6714d8e8 KH |
171 | if (tmplock == lock) |
172 | continue; | |
173 | if (!dlm_lock_compatible(tmplock->ml.type, type)) | |
174 | goto switch_queues; | |
175 | } | |
176 | ||
df53cd3b | 177 | list_for_each_entry(tmplock, &res->converting, list) { |
6714d8e8 KH |
178 | if (!dlm_lock_compatible(tmplock->ml.type, type)) |
179 | goto switch_queues; | |
180 | /* existing conversion requests take precedence */ | |
181 | if (!dlm_lock_compatible(tmplock->ml.convert_type, type)) | |
182 | goto switch_queues; | |
183 | } | |
184 | ||
185 | /* fall thru to grant */ | |
186 | ||
187 | grant: | |
188 | mlog(0, "res %.*s, granting %s lock\n", res->lockname.len, | |
189 | res->lockname.name, dlm_lock_mode_name(type)); | |
190 | /* immediately grant the new lock type */ | |
191 | lock->lksb->status = DLM_NORMAL; | |
192 | if (lock->ml.node == dlm->node_num) | |
193 | mlog(0, "doing in-place convert for nonlocal lock\n"); | |
194 | lock->ml.type = type; | |
c0a8520c MF |
195 | if (lock->lksb->flags & DLM_LKSB_PUT_LVB) |
196 | memcpy(res->lvb, lock->lksb->lvb, DLM_LVB_LEN); | |
197 | ||
e5054c9a | 198 | /* |
199 | * Move the lock to the tail because it may be the only lock which has | |
200 | * an invalid lvb. | |
201 | */ | |
202 | list_move_tail(&lock->list, &res->granted); | |
203 | ||
6714d8e8 KH |
204 | status = DLM_NORMAL; |
205 | *call_ast = 1; | |
206 | goto unlock_exit; | |
207 | ||
208 | switch_queues: | |
209 | if (flags & LKM_NOQUEUE) { | |
210 | mlog(0, "failed to convert NOQUEUE lock %.*s from " | |
211 | "%d to %d...\n", res->lockname.len, res->lockname.name, | |
212 | lock->ml.type, type); | |
213 | status = DLM_NOTQUEUED; | |
214 | goto unlock_exit; | |
215 | } | |
216 | mlog(0, "res %.*s, queueing...\n", res->lockname.len, | |
217 | res->lockname.name); | |
218 | ||
219 | lock->ml.convert_type = type; | |
220 | /* do not alter lock refcount. switching lists. */ | |
f116629d | 221 | list_move_tail(&lock->list, &res->converting); |
6714d8e8 KH |
222 | |
223 | unlock_exit: | |
224 | spin_unlock(&lock->spinlock); | |
225 | if (status == DLM_DENIED) { | |
226 | __dlm_print_one_lock_resource(res); | |
227 | } | |
228 | if (status == DLM_NORMAL) | |
229 | *kick_thread = 1; | |
230 | return status; | |
231 | } | |
232 | ||
233 | void dlm_revert_pending_convert(struct dlm_lock_resource *res, | |
234 | struct dlm_lock *lock) | |
235 | { | |
236 | /* do not alter lock refcount. switching lists. */ | |
f116629d | 237 | list_move_tail(&lock->list, &res->granted); |
6714d8e8 KH |
238 | lock->ml.convert_type = LKM_IVMODE; |
239 | lock->lksb->flags &= ~(DLM_LKSB_GET_LVB|DLM_LKSB_PUT_LVB); | |
240 | } | |
241 | ||
242 | /* messages the master site to do lock conversion | |
243 | * locking: | |
244 | * caller needs: none | |
245 | * taken: takes and drops res->spinlock, uses DLM_LOCK_RES_IN_PROGRESS | |
246 | * held on exit: none | |
247 | * returns: DLM_NORMAL, DLM_RECOVERING, status from remote node | |
248 | */ | |
249 | enum dlm_status dlmconvert_remote(struct dlm_ctxt *dlm, | |
250 | struct dlm_lock_resource *res, | |
251 | struct dlm_lock *lock, int flags, int type) | |
252 | { | |
253 | enum dlm_status status; | |
254 | ||
255 | mlog(0, "type=%d, convert_type=%d, busy=%d\n", lock->ml.type, | |
256 | lock->ml.convert_type, res->state & DLM_LOCK_RES_IN_PROGRESS); | |
257 | ||
258 | spin_lock(&res->spinlock); | |
259 | if (res->state & DLM_LOCK_RES_RECOVERING) { | |
260 | mlog(0, "bailing out early since res is RECOVERING " | |
261 | "on secondary queue\n"); | |
262 | /* __dlm_print_one_lock_resource(res); */ | |
263 | status = DLM_RECOVERING; | |
264 | goto bail; | |
265 | } | |
266 | /* will exit this call with spinlock held */ | |
267 | __dlm_wait_on_lockres(res); | |
268 | ||
269 | if (lock->ml.convert_type != LKM_IVMODE) { | |
270 | __dlm_print_one_lock_resource(res); | |
271 | mlog(ML_ERROR, "converting a remote lock that is already " | |
29004858 | 272 | "converting! (cookie=%u:%llu, conv=%d)\n", |
74aa2585 KH |
273 | dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)), |
274 | dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)), | |
29004858 | 275 | lock->ml.convert_type); |
6714d8e8 KH |
276 | status = DLM_DENIED; |
277 | goto bail; | |
278 | } | |
be12b299 JQ |
279 | |
280 | if (lock->ml.type == type && lock->ml.convert_type == LKM_IVMODE) { | |
281 | mlog(0, "last convert request returned DLM_RECOVERING, but " | |
282 | "owner has already queued and sent ast to me. res %.*s, " | |
283 | "(cookie=%u:%llu, type=%d, conv=%d)\n", | |
284 | res->lockname.len, res->lockname.name, | |
285 | dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)), | |
286 | dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)), | |
287 | lock->ml.type, lock->ml.convert_type); | |
288 | status = DLM_NORMAL; | |
289 | goto bail; | |
290 | } | |
291 | ||
6714d8e8 KH |
292 | res->state |= DLM_LOCK_RES_IN_PROGRESS; |
293 | /* move lock to local convert queue */ | |
294 | /* do not alter lock refcount. switching lists. */ | |
f116629d | 295 | list_move_tail(&lock->list, &res->converting); |
6714d8e8 KH |
296 | lock->convert_pending = 1; |
297 | lock->ml.convert_type = type; | |
298 | ||
299 | if (flags & LKM_VALBLK) { | |
300 | if (lock->ml.type == LKM_EXMODE) { | |
301 | flags |= LKM_PUT_LVB; | |
302 | lock->lksb->flags |= DLM_LKSB_PUT_LVB; | |
303 | } else { | |
304 | if (lock->ml.convert_type == LKM_NLMODE) | |
305 | flags &= ~LKM_VALBLK; | |
306 | else { | |
307 | flags |= LKM_GET_LVB; | |
308 | lock->lksb->flags |= DLM_LKSB_GET_LVB; | |
309 | } | |
310 | } | |
311 | } | |
312 | spin_unlock(&res->spinlock); | |
313 | ||
314 | /* no locks held here. | |
315 | * need to wait for a reply as to whether it got queued or not. */ | |
316 | status = dlm_send_remote_convert_request(dlm, res, lock, flags, type); | |
317 | ||
318 | spin_lock(&res->spinlock); | |
319 | res->state &= ~DLM_LOCK_RES_IN_PROGRESS; | |
ac7cf246 JQ |
320 | /* if it failed, move it back to granted queue. |
321 | * if master returns DLM_NORMAL and then down before sending ast, | |
322 | * it may have already been moved to granted queue, reset to | |
323 | * DLM_RECOVERING and retry convert */ | |
6714d8e8 KH |
324 | if (status != DLM_NORMAL) { |
325 | if (status != DLM_NOTQUEUED) | |
326 | dlm_error(status); | |
327 | dlm_revert_pending_convert(res, lock); | |
e6f0c6e6 JQ |
328 | } else if (!lock->convert_pending) { |
329 | mlog(0, "%s: res %.*s, owner died and lock has been moved back " | |
330 | "to granted list, retry convert.\n", | |
331 | dlm->name, res->lockname.len, res->lockname.name); | |
ac7cf246 | 332 | status = DLM_RECOVERING; |
6714d8e8 | 333 | } |
e6f0c6e6 JQ |
334 | |
335 | lock->convert_pending = 0; | |
6714d8e8 KH |
336 | bail: |
337 | spin_unlock(&res->spinlock); | |
338 | ||
339 | /* TODO: should this be a wake_one? */ | |
340 | /* wake up any IN_PROGRESS waiters */ | |
341 | wake_up(&res->wq); | |
342 | ||
343 | return status; | |
344 | } | |
345 | ||
346 | /* sends DLM_CONVERT_LOCK_MSG to master site | |
347 | * locking: | |
348 | * caller needs: none | |
349 | * taken: none | |
350 | * held on exit: none | |
351 | * returns: DLM_NOLOCKMGR, status from remote node | |
352 | */ | |
353 | static enum dlm_status dlm_send_remote_convert_request(struct dlm_ctxt *dlm, | |
354 | struct dlm_lock_resource *res, | |
355 | struct dlm_lock *lock, int flags, int type) | |
356 | { | |
357 | struct dlm_convert_lock convert; | |
358 | int tmpret; | |
359 | enum dlm_status ret; | |
360 | int status = 0; | |
361 | struct kvec vec[2]; | |
362 | size_t veclen = 1; | |
363 | ||
ef6b689b | 364 | mlog(0, "%.*s\n", res->lockname.len, res->lockname.name); |
6714d8e8 KH |
365 | |
366 | memset(&convert, 0, sizeof(struct dlm_convert_lock)); | |
367 | convert.node_idx = dlm->node_num; | |
368 | convert.requested_type = type; | |
369 | convert.cookie = lock->ml.cookie; | |
370 | convert.namelen = res->lockname.len; | |
371 | convert.flags = cpu_to_be32(flags); | |
372 | memcpy(convert.name, res->lockname.name, convert.namelen); | |
373 | ||
374 | vec[0].iov_len = sizeof(struct dlm_convert_lock); | |
375 | vec[0].iov_base = &convert; | |
376 | ||
377 | if (flags & LKM_PUT_LVB) { | |
378 | /* extra data to send if we are updating lvb */ | |
379 | vec[1].iov_len = DLM_LVB_LEN; | |
380 | vec[1].iov_base = lock->lksb->lvb; | |
381 | veclen++; | |
382 | } | |
383 | ||
384 | tmpret = o2net_send_message_vec(DLM_CONVERT_LOCK_MSG, dlm->key, | |
385 | vec, veclen, res->owner, &status); | |
386 | if (tmpret >= 0) { | |
387 | // successfully sent and received | |
388 | ret = status; // this is already a dlm_status | |
389 | if (ret == DLM_RECOVERING) { | |
390 | mlog(0, "node %u returned DLM_RECOVERING from convert " | |
391 | "message!\n", res->owner); | |
392 | } else if (ret == DLM_MIGRATING) { | |
393 | mlog(0, "node %u returned DLM_MIGRATING from convert " | |
394 | "message!\n", res->owner); | |
395 | } else if (ret == DLM_FORWARD) { | |
396 | mlog(0, "node %u returned DLM_FORWARD from convert " | |
397 | "message!\n", res->owner); | |
398 | } else if (ret != DLM_NORMAL && ret != DLM_NOTQUEUED) | |
399 | dlm_error(ret); | |
400 | } else { | |
a5196ec5 WW |
401 | mlog(ML_ERROR, "Error %d when sending message %u (key 0x%x) to " |
402 | "node %u\n", tmpret, DLM_CONVERT_LOCK_MSG, dlm->key, | |
403 | res->owner); | |
6714d8e8 | 404 | if (dlm_is_host_down(tmpret)) { |
44465a7d KH |
405 | /* instead of logging the same network error over |
406 | * and over, sleep here and wait for the heartbeat | |
407 | * to notice the node is dead. times out after 5s. */ | |
2bd63216 | 408 | dlm_wait_for_node_death(dlm, res->owner, |
44465a7d | 409 | DLM_NODE_DEATH_WAIT_MAX); |
6714d8e8 KH |
410 | ret = DLM_RECOVERING; |
411 | mlog(0, "node %u died so returning DLM_RECOVERING " | |
412 | "from convert message!\n", res->owner); | |
413 | } else { | |
414 | ret = dlm_err_to_dlm_status(tmpret); | |
415 | } | |
416 | } | |
417 | ||
418 | return ret; | |
419 | } | |
420 | ||
421 | /* handler for DLM_CONVERT_LOCK_MSG on master site | |
422 | * locking: | |
423 | * caller needs: none | |
424 | * taken: takes and drop res->spinlock | |
425 | * held on exit: none | |
426 | * returns: DLM_NORMAL, DLM_IVLOCKID, DLM_BADARGS, | |
427 | * status from __dlmconvert_master | |
428 | */ | |
d74c9803 KH |
429 | int dlm_convert_lock_handler(struct o2net_msg *msg, u32 len, void *data, |
430 | void **ret_data) | |
6714d8e8 KH |
431 | { |
432 | struct dlm_ctxt *dlm = data; | |
433 | struct dlm_convert_lock *cnv = (struct dlm_convert_lock *)msg->buf; | |
434 | struct dlm_lock_resource *res = NULL; | |
6714d8e8 | 435 | struct dlm_lock *lock = NULL; |
df53cd3b | 436 | struct dlm_lock *tmp_lock; |
6714d8e8 KH |
437 | struct dlm_lockstatus *lksb; |
438 | enum dlm_status status = DLM_NORMAL; | |
439 | u32 flags; | |
a6fa3640 | 440 | int call_ast = 0, kick_thread = 0, ast_reserved = 0, wake = 0; |
6714d8e8 KH |
441 | |
442 | if (!dlm_grab(dlm)) { | |
443 | dlm_error(DLM_REJECTED); | |
444 | return DLM_REJECTED; | |
445 | } | |
446 | ||
447 | mlog_bug_on_msg(!dlm_domain_fully_joined(dlm), | |
448 | "Domain %s not fully joined!\n", dlm->name); | |
449 | ||
450 | if (cnv->namelen > DLM_LOCKID_NAME_MAX) { | |
451 | status = DLM_IVBUFLEN; | |
452 | dlm_error(status); | |
453 | goto leave; | |
454 | } | |
455 | ||
456 | flags = be32_to_cpu(cnv->flags); | |
457 | ||
458 | if ((flags & (LKM_PUT_LVB|LKM_GET_LVB)) == | |
459 | (LKM_PUT_LVB|LKM_GET_LVB)) { | |
460 | mlog(ML_ERROR, "both PUT and GET lvb specified\n"); | |
461 | status = DLM_BADARGS; | |
462 | goto leave; | |
463 | } | |
464 | ||
465 | mlog(0, "lvb: %s\n", flags & LKM_PUT_LVB ? "put lvb" : | |
466 | (flags & LKM_GET_LVB ? "get lvb" : "none")); | |
467 | ||
468 | status = DLM_IVLOCKID; | |
469 | res = dlm_lookup_lockres(dlm, cnv->name, cnv->namelen); | |
470 | if (!res) { | |
471 | dlm_error(status); | |
472 | goto leave; | |
473 | } | |
474 | ||
475 | spin_lock(&res->spinlock); | |
b220532a KH |
476 | status = __dlm_lockres_state_to_status(res); |
477 | if (status != DLM_NORMAL) { | |
478 | spin_unlock(&res->spinlock); | |
479 | dlm_error(status); | |
480 | goto leave; | |
481 | } | |
df53cd3b DF |
482 | list_for_each_entry(tmp_lock, &res->granted, list) { |
483 | if (tmp_lock->ml.cookie == cnv->cookie && | |
484 | tmp_lock->ml.node == cnv->node_idx) { | |
485 | lock = tmp_lock; | |
6714d8e8 KH |
486 | dlm_lock_get(lock); |
487 | break; | |
488 | } | |
6714d8e8 KH |
489 | } |
490 | spin_unlock(&res->spinlock); | |
491 | if (!lock) { | |
492 | status = DLM_IVLOCKID; | |
90aaaf1c KH |
493 | mlog(ML_ERROR, "did not find lock to convert on grant queue! " |
494 | "cookie=%u:%llu\n", | |
74aa2585 KH |
495 | dlm_get_lock_cookie_node(be64_to_cpu(cnv->cookie)), |
496 | dlm_get_lock_cookie_seq(be64_to_cpu(cnv->cookie))); | |
2af37ce8 | 497 | dlm_print_one_lock_resource(res); |
6714d8e8 KH |
498 | goto leave; |
499 | } | |
500 | ||
501 | /* found the lock */ | |
502 | lksb = lock->lksb; | |
503 | ||
504 | /* see if caller needed to get/put lvb */ | |
505 | if (flags & LKM_PUT_LVB) { | |
506 | BUG_ON(lksb->flags & (DLM_LKSB_PUT_LVB|DLM_LKSB_GET_LVB)); | |
507 | lksb->flags |= DLM_LKSB_PUT_LVB; | |
508 | memcpy(&lksb->lvb[0], &cnv->lvb[0], DLM_LVB_LEN); | |
509 | } else if (flags & LKM_GET_LVB) { | |
510 | BUG_ON(lksb->flags & (DLM_LKSB_PUT_LVB|DLM_LKSB_GET_LVB)); | |
511 | lksb->flags |= DLM_LKSB_GET_LVB; | |
512 | } | |
513 | ||
514 | spin_lock(&res->spinlock); | |
515 | status = __dlm_lockres_state_to_status(res); | |
516 | if (status == DLM_NORMAL) { | |
517 | __dlm_lockres_reserve_ast(res); | |
e2b5e450 | 518 | ast_reserved = 1; |
6714d8e8 KH |
519 | res->state |= DLM_LOCK_RES_IN_PROGRESS; |
520 | status = __dlmconvert_master(dlm, res, lock, flags, | |
521 | cnv->requested_type, | |
522 | &call_ast, &kick_thread); | |
523 | res->state &= ~DLM_LOCK_RES_IN_PROGRESS; | |
a6fa3640 | 524 | wake = 1; |
6714d8e8 KH |
525 | } |
526 | spin_unlock(&res->spinlock); | |
a6fa3640 KH |
527 | if (wake) |
528 | wake_up(&res->wq); | |
6714d8e8 KH |
529 | |
530 | if (status != DLM_NORMAL) { | |
531 | if (status != DLM_NOTQUEUED) | |
532 | dlm_error(status); | |
533 | lksb->flags &= ~(DLM_LKSB_GET_LVB|DLM_LKSB_PUT_LVB); | |
534 | } | |
535 | ||
536 | leave: | |
90aaaf1c | 537 | if (lock) |
6714d8e8 KH |
538 | dlm_lock_put(lock); |
539 | ||
e2b5e450 | 540 | /* either queue the ast or release it, if reserved */ |
6714d8e8 KH |
541 | if (call_ast) |
542 | dlm_queue_ast(dlm, lock); | |
e2b5e450 | 543 | else if (ast_reserved) |
6714d8e8 KH |
544 | dlm_lockres_release_ast(dlm, res); |
545 | ||
546 | if (kick_thread) | |
547 | dlm_kick_thread(dlm, res); | |
548 | ||
549 | if (res) | |
550 | dlm_lockres_put(res); | |
551 | ||
552 | dlm_put(dlm); | |
553 | ||
554 | return status; | |
555 | } |