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1 | /* -*- mode: c; c-basic-offset: 8; -*- |
2 | * vim: noexpandtab sw=8 ts=8 sts=0: | |
3 | * | |
4 | * dlmconvert.c | |
5 | * | |
6 | * underlying calls for lock conversion | |
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> | |
33 | #include <linux/utsname.h> | |
34 | #include <linux/init.h> | |
35 | #include <linux/sysctl.h> | |
36 | #include <linux/random.h> | |
37 | #include <linux/blkdev.h> | |
38 | #include <linux/socket.h> | |
39 | #include <linux/inet.h> | |
40 | #include <linux/spinlock.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 | ||
55 | /* NOTE: __dlmconvert_master is the only function in here that | |
56 | * needs a spinlock held on entry (res->spinlock) and it is the | |
57 | * only one that holds a lock on exit (res->spinlock). | |
58 | * All other functions in here need no locks and drop all of | |
59 | * the locks that they acquire. */ | |
60 | static enum dlm_status __dlmconvert_master(struct dlm_ctxt *dlm, | |
61 | struct dlm_lock_resource *res, | |
62 | struct dlm_lock *lock, int flags, | |
63 | int type, int *call_ast, | |
64 | int *kick_thread); | |
65 | static enum dlm_status dlm_send_remote_convert_request(struct dlm_ctxt *dlm, | |
66 | struct dlm_lock_resource *res, | |
67 | struct dlm_lock *lock, int flags, int type); | |
68 | ||
69 | /* | |
70 | * this is only called directly by dlmlock(), and only when the | |
71 | * local node is the owner of the lockres | |
72 | * locking: | |
73 | * caller needs: none | |
74 | * taken: takes and drops res->spinlock | |
75 | * held on exit: none | |
76 | * returns: see __dlmconvert_master | |
77 | */ | |
78 | enum dlm_status dlmconvert_master(struct dlm_ctxt *dlm, | |
79 | struct dlm_lock_resource *res, | |
80 | struct dlm_lock *lock, int flags, int type) | |
81 | { | |
82 | int call_ast = 0, kick_thread = 0; | |
83 | enum dlm_status status; | |
84 | ||
85 | spin_lock(&res->spinlock); | |
86 | /* we are not in a network handler, this is fine */ | |
87 | __dlm_wait_on_lockres(res); | |
88 | __dlm_lockres_reserve_ast(res); | |
89 | res->state |= DLM_LOCK_RES_IN_PROGRESS; | |
90 | ||
91 | status = __dlmconvert_master(dlm, res, lock, flags, type, | |
92 | &call_ast, &kick_thread); | |
93 | ||
94 | res->state &= ~DLM_LOCK_RES_IN_PROGRESS; | |
95 | spin_unlock(&res->spinlock); | |
96 | wake_up(&res->wq); | |
97 | if (status != DLM_NORMAL && status != DLM_NOTQUEUED) | |
98 | dlm_error(status); | |
99 | ||
100 | /* either queue the ast or release it */ | |
101 | if (call_ast) | |
102 | dlm_queue_ast(dlm, lock); | |
103 | else | |
104 | dlm_lockres_release_ast(dlm, res); | |
105 | ||
106 | if (kick_thread) | |
107 | dlm_kick_thread(dlm, res); | |
108 | ||
109 | return status; | |
110 | } | |
111 | ||
112 | /* performs lock conversion at the lockres master site | |
113 | * locking: | |
114 | * caller needs: res->spinlock | |
115 | * taken: takes and drops lock->spinlock | |
116 | * held on exit: res->spinlock | |
117 | * returns: DLM_NORMAL, DLM_NOTQUEUED, DLM_DENIED | |
118 | * call_ast: whether ast should be called for this lock | |
119 | * kick_thread: whether dlm_kick_thread should be called | |
120 | */ | |
121 | static enum dlm_status __dlmconvert_master(struct dlm_ctxt *dlm, | |
122 | struct dlm_lock_resource *res, | |
123 | struct dlm_lock *lock, int flags, | |
124 | int type, int *call_ast, | |
125 | int *kick_thread) | |
126 | { | |
127 | enum dlm_status status = DLM_NORMAL; | |
128 | struct list_head *iter; | |
129 | struct dlm_lock *tmplock=NULL; | |
130 | ||
131 | assert_spin_locked(&res->spinlock); | |
132 | ||
133 | mlog_entry("type=%d, convert_type=%d, new convert_type=%d\n", | |
134 | lock->ml.type, lock->ml.convert_type, type); | |
135 | ||
136 | spin_lock(&lock->spinlock); | |
137 | ||
138 | /* already converting? */ | |
139 | if (lock->ml.convert_type != LKM_IVMODE) { | |
140 | mlog(ML_ERROR, "attempted to convert a lock with a lock " | |
141 | "conversion pending\n"); | |
142 | status = DLM_DENIED; | |
143 | goto unlock_exit; | |
144 | } | |
145 | ||
146 | /* must be on grant queue to convert */ | |
147 | if (!dlm_lock_on_list(&res->granted, lock)) { | |
148 | mlog(ML_ERROR, "attempted to convert a lock not on grant " | |
149 | "queue\n"); | |
150 | status = DLM_DENIED; | |
151 | goto unlock_exit; | |
152 | } | |
153 | ||
154 | if (flags & LKM_VALBLK) { | |
155 | switch (lock->ml.type) { | |
156 | case LKM_EXMODE: | |
157 | /* EX + LKM_VALBLK + convert == set lvb */ | |
158 | mlog(0, "will set lvb: converting %s->%s\n", | |
159 | dlm_lock_mode_name(lock->ml.type), | |
160 | dlm_lock_mode_name(type)); | |
161 | lock->lksb->flags |= DLM_LKSB_PUT_LVB; | |
162 | break; | |
163 | case LKM_PRMODE: | |
164 | case LKM_NLMODE: | |
165 | /* refetch if new level is not NL */ | |
166 | if (type > LKM_NLMODE) { | |
167 | mlog(0, "will fetch new value into " | |
168 | "lvb: converting %s->%s\n", | |
169 | dlm_lock_mode_name(lock->ml.type), | |
170 | dlm_lock_mode_name(type)); | |
171 | lock->lksb->flags |= DLM_LKSB_GET_LVB; | |
172 | } else { | |
173 | mlog(0, "will NOT fetch new value " | |
174 | "into lvb: converting %s->%s\n", | |
175 | dlm_lock_mode_name(lock->ml.type), | |
176 | dlm_lock_mode_name(type)); | |
177 | flags &= ~(LKM_VALBLK); | |
178 | } | |
179 | break; | |
180 | } | |
181 | } | |
182 | ||
183 | ||
184 | /* in-place downconvert? */ | |
185 | if (type <= lock->ml.type) | |
186 | goto grant; | |
187 | ||
188 | /* upconvert from here on */ | |
189 | status = DLM_NORMAL; | |
190 | list_for_each(iter, &res->granted) { | |
191 | tmplock = list_entry(iter, struct dlm_lock, list); | |
192 | if (tmplock == lock) | |
193 | continue; | |
194 | if (!dlm_lock_compatible(tmplock->ml.type, type)) | |
195 | goto switch_queues; | |
196 | } | |
197 | ||
198 | list_for_each(iter, &res->converting) { | |
199 | tmplock = list_entry(iter, struct dlm_lock, list); | |
200 | if (!dlm_lock_compatible(tmplock->ml.type, type)) | |
201 | goto switch_queues; | |
202 | /* existing conversion requests take precedence */ | |
203 | if (!dlm_lock_compatible(tmplock->ml.convert_type, type)) | |
204 | goto switch_queues; | |
205 | } | |
206 | ||
207 | /* fall thru to grant */ | |
208 | ||
209 | grant: | |
210 | mlog(0, "res %.*s, granting %s lock\n", res->lockname.len, | |
211 | res->lockname.name, dlm_lock_mode_name(type)); | |
212 | /* immediately grant the new lock type */ | |
213 | lock->lksb->status = DLM_NORMAL; | |
214 | if (lock->ml.node == dlm->node_num) | |
215 | mlog(0, "doing in-place convert for nonlocal lock\n"); | |
216 | lock->ml.type = type; | |
217 | status = DLM_NORMAL; | |
218 | *call_ast = 1; | |
219 | goto unlock_exit; | |
220 | ||
221 | switch_queues: | |
222 | if (flags & LKM_NOQUEUE) { | |
223 | mlog(0, "failed to convert NOQUEUE lock %.*s from " | |
224 | "%d to %d...\n", res->lockname.len, res->lockname.name, | |
225 | lock->ml.type, type); | |
226 | status = DLM_NOTQUEUED; | |
227 | goto unlock_exit; | |
228 | } | |
229 | mlog(0, "res %.*s, queueing...\n", res->lockname.len, | |
230 | res->lockname.name); | |
231 | ||
232 | lock->ml.convert_type = type; | |
233 | /* do not alter lock refcount. switching lists. */ | |
234 | list_del_init(&lock->list); | |
235 | list_add_tail(&lock->list, &res->converting); | |
236 | ||
237 | unlock_exit: | |
238 | spin_unlock(&lock->spinlock); | |
239 | if (status == DLM_DENIED) { | |
240 | __dlm_print_one_lock_resource(res); | |
241 | } | |
242 | if (status == DLM_NORMAL) | |
243 | *kick_thread = 1; | |
244 | return status; | |
245 | } | |
246 | ||
247 | void dlm_revert_pending_convert(struct dlm_lock_resource *res, | |
248 | struct dlm_lock *lock) | |
249 | { | |
250 | /* do not alter lock refcount. switching lists. */ | |
251 | list_del_init(&lock->list); | |
252 | list_add_tail(&lock->list, &res->granted); | |
253 | lock->ml.convert_type = LKM_IVMODE; | |
254 | lock->lksb->flags &= ~(DLM_LKSB_GET_LVB|DLM_LKSB_PUT_LVB); | |
255 | } | |
256 | ||
257 | /* messages the master site to do lock conversion | |
258 | * locking: | |
259 | * caller needs: none | |
260 | * taken: takes and drops res->spinlock, uses DLM_LOCK_RES_IN_PROGRESS | |
261 | * held on exit: none | |
262 | * returns: DLM_NORMAL, DLM_RECOVERING, status from remote node | |
263 | */ | |
264 | enum dlm_status dlmconvert_remote(struct dlm_ctxt *dlm, | |
265 | struct dlm_lock_resource *res, | |
266 | struct dlm_lock *lock, int flags, int type) | |
267 | { | |
268 | enum dlm_status status; | |
269 | ||
270 | mlog(0, "type=%d, convert_type=%d, busy=%d\n", lock->ml.type, | |
271 | lock->ml.convert_type, res->state & DLM_LOCK_RES_IN_PROGRESS); | |
272 | ||
273 | spin_lock(&res->spinlock); | |
274 | if (res->state & DLM_LOCK_RES_RECOVERING) { | |
275 | mlog(0, "bailing out early since res is RECOVERING " | |
276 | "on secondary queue\n"); | |
277 | /* __dlm_print_one_lock_resource(res); */ | |
278 | status = DLM_RECOVERING; | |
279 | goto bail; | |
280 | } | |
281 | /* will exit this call with spinlock held */ | |
282 | __dlm_wait_on_lockres(res); | |
283 | ||
284 | if (lock->ml.convert_type != LKM_IVMODE) { | |
285 | __dlm_print_one_lock_resource(res); | |
286 | mlog(ML_ERROR, "converting a remote lock that is already " | |
287 | "converting! (cookie=%"MLFu64", conv=%d)\n", | |
288 | lock->ml.cookie, lock->ml.convert_type); | |
289 | status = DLM_DENIED; | |
290 | goto bail; | |
291 | } | |
292 | res->state |= DLM_LOCK_RES_IN_PROGRESS; | |
293 | /* move lock to local convert queue */ | |
294 | /* do not alter lock refcount. switching lists. */ | |
295 | list_del_init(&lock->list); | |
296 | list_add_tail(&lock->list, &res->converting); | |
297 | lock->convert_pending = 1; | |
298 | lock->ml.convert_type = type; | |
299 | ||
300 | if (flags & LKM_VALBLK) { | |
301 | if (lock->ml.type == LKM_EXMODE) { | |
302 | flags |= LKM_PUT_LVB; | |
303 | lock->lksb->flags |= DLM_LKSB_PUT_LVB; | |
304 | } else { | |
305 | if (lock->ml.convert_type == LKM_NLMODE) | |
306 | flags &= ~LKM_VALBLK; | |
307 | else { | |
308 | flags |= LKM_GET_LVB; | |
309 | lock->lksb->flags |= DLM_LKSB_GET_LVB; | |
310 | } | |
311 | } | |
312 | } | |
313 | spin_unlock(&res->spinlock); | |
314 | ||
315 | /* no locks held here. | |
316 | * need to wait for a reply as to whether it got queued or not. */ | |
317 | status = dlm_send_remote_convert_request(dlm, res, lock, flags, type); | |
318 | ||
319 | spin_lock(&res->spinlock); | |
320 | res->state &= ~DLM_LOCK_RES_IN_PROGRESS; | |
321 | lock->convert_pending = 0; | |
322 | /* if it failed, move it back to granted queue */ | |
323 | if (status != DLM_NORMAL) { | |
324 | if (status != DLM_NOTQUEUED) | |
325 | dlm_error(status); | |
326 | dlm_revert_pending_convert(res, lock); | |
327 | } | |
328 | bail: | |
329 | spin_unlock(&res->spinlock); | |
330 | ||
331 | /* TODO: should this be a wake_one? */ | |
332 | /* wake up any IN_PROGRESS waiters */ | |
333 | wake_up(&res->wq); | |
334 | ||
335 | return status; | |
336 | } | |
337 | ||
338 | /* sends DLM_CONVERT_LOCK_MSG to master site | |
339 | * locking: | |
340 | * caller needs: none | |
341 | * taken: none | |
342 | * held on exit: none | |
343 | * returns: DLM_NOLOCKMGR, status from remote node | |
344 | */ | |
345 | static enum dlm_status dlm_send_remote_convert_request(struct dlm_ctxt *dlm, | |
346 | struct dlm_lock_resource *res, | |
347 | struct dlm_lock *lock, int flags, int type) | |
348 | { | |
349 | struct dlm_convert_lock convert; | |
350 | int tmpret; | |
351 | enum dlm_status ret; | |
352 | int status = 0; | |
353 | struct kvec vec[2]; | |
354 | size_t veclen = 1; | |
355 | ||
356 | mlog_entry("%.*s\n", res->lockname.len, res->lockname.name); | |
357 | ||
358 | memset(&convert, 0, sizeof(struct dlm_convert_lock)); | |
359 | convert.node_idx = dlm->node_num; | |
360 | convert.requested_type = type; | |
361 | convert.cookie = lock->ml.cookie; | |
362 | convert.namelen = res->lockname.len; | |
363 | convert.flags = cpu_to_be32(flags); | |
364 | memcpy(convert.name, res->lockname.name, convert.namelen); | |
365 | ||
366 | vec[0].iov_len = sizeof(struct dlm_convert_lock); | |
367 | vec[0].iov_base = &convert; | |
368 | ||
369 | if (flags & LKM_PUT_LVB) { | |
370 | /* extra data to send if we are updating lvb */ | |
371 | vec[1].iov_len = DLM_LVB_LEN; | |
372 | vec[1].iov_base = lock->lksb->lvb; | |
373 | veclen++; | |
374 | } | |
375 | ||
376 | tmpret = o2net_send_message_vec(DLM_CONVERT_LOCK_MSG, dlm->key, | |
377 | vec, veclen, res->owner, &status); | |
378 | if (tmpret >= 0) { | |
379 | // successfully sent and received | |
380 | ret = status; // this is already a dlm_status | |
381 | if (ret == DLM_RECOVERING) { | |
382 | mlog(0, "node %u returned DLM_RECOVERING from convert " | |
383 | "message!\n", res->owner); | |
384 | } else if (ret == DLM_MIGRATING) { | |
385 | mlog(0, "node %u returned DLM_MIGRATING from convert " | |
386 | "message!\n", res->owner); | |
387 | } else if (ret == DLM_FORWARD) { | |
388 | mlog(0, "node %u returned DLM_FORWARD from convert " | |
389 | "message!\n", res->owner); | |
390 | } else if (ret != DLM_NORMAL && ret != DLM_NOTQUEUED) | |
391 | dlm_error(ret); | |
392 | } else { | |
393 | mlog_errno(tmpret); | |
394 | if (dlm_is_host_down(tmpret)) { | |
395 | ret = DLM_RECOVERING; | |
396 | mlog(0, "node %u died so returning DLM_RECOVERING " | |
397 | "from convert message!\n", res->owner); | |
398 | } else { | |
399 | ret = dlm_err_to_dlm_status(tmpret); | |
400 | } | |
401 | } | |
402 | ||
403 | return ret; | |
404 | } | |
405 | ||
406 | /* handler for DLM_CONVERT_LOCK_MSG on master site | |
407 | * locking: | |
408 | * caller needs: none | |
409 | * taken: takes and drop res->spinlock | |
410 | * held on exit: none | |
411 | * returns: DLM_NORMAL, DLM_IVLOCKID, DLM_BADARGS, | |
412 | * status from __dlmconvert_master | |
413 | */ | |
414 | int dlm_convert_lock_handler(struct o2net_msg *msg, u32 len, void *data) | |
415 | { | |
416 | struct dlm_ctxt *dlm = data; | |
417 | struct dlm_convert_lock *cnv = (struct dlm_convert_lock *)msg->buf; | |
418 | struct dlm_lock_resource *res = NULL; | |
419 | struct list_head *iter; | |
420 | struct dlm_lock *lock = NULL; | |
421 | struct dlm_lockstatus *lksb; | |
422 | enum dlm_status status = DLM_NORMAL; | |
423 | u32 flags; | |
424 | int call_ast = 0, kick_thread = 0; | |
425 | ||
426 | if (!dlm_grab(dlm)) { | |
427 | dlm_error(DLM_REJECTED); | |
428 | return DLM_REJECTED; | |
429 | } | |
430 | ||
431 | mlog_bug_on_msg(!dlm_domain_fully_joined(dlm), | |
432 | "Domain %s not fully joined!\n", dlm->name); | |
433 | ||
434 | if (cnv->namelen > DLM_LOCKID_NAME_MAX) { | |
435 | status = DLM_IVBUFLEN; | |
436 | dlm_error(status); | |
437 | goto leave; | |
438 | } | |
439 | ||
440 | flags = be32_to_cpu(cnv->flags); | |
441 | ||
442 | if ((flags & (LKM_PUT_LVB|LKM_GET_LVB)) == | |
443 | (LKM_PUT_LVB|LKM_GET_LVB)) { | |
444 | mlog(ML_ERROR, "both PUT and GET lvb specified\n"); | |
445 | status = DLM_BADARGS; | |
446 | goto leave; | |
447 | } | |
448 | ||
449 | mlog(0, "lvb: %s\n", flags & LKM_PUT_LVB ? "put lvb" : | |
450 | (flags & LKM_GET_LVB ? "get lvb" : "none")); | |
451 | ||
452 | status = DLM_IVLOCKID; | |
453 | res = dlm_lookup_lockres(dlm, cnv->name, cnv->namelen); | |
454 | if (!res) { | |
455 | dlm_error(status); | |
456 | goto leave; | |
457 | } | |
458 | ||
459 | spin_lock(&res->spinlock); | |
460 | list_for_each(iter, &res->granted) { | |
461 | lock = list_entry(iter, struct dlm_lock, list); | |
462 | if (lock->ml.cookie == cnv->cookie && | |
463 | lock->ml.node == cnv->node_idx) { | |
464 | dlm_lock_get(lock); | |
465 | break; | |
466 | } | |
467 | lock = NULL; | |
468 | } | |
469 | spin_unlock(&res->spinlock); | |
470 | if (!lock) { | |
471 | status = DLM_IVLOCKID; | |
472 | dlm_error(status); | |
473 | goto leave; | |
474 | } | |
475 | ||
476 | /* found the lock */ | |
477 | lksb = lock->lksb; | |
478 | ||
479 | /* see if caller needed to get/put lvb */ | |
480 | if (flags & LKM_PUT_LVB) { | |
481 | BUG_ON(lksb->flags & (DLM_LKSB_PUT_LVB|DLM_LKSB_GET_LVB)); | |
482 | lksb->flags |= DLM_LKSB_PUT_LVB; | |
483 | memcpy(&lksb->lvb[0], &cnv->lvb[0], DLM_LVB_LEN); | |
484 | } else if (flags & LKM_GET_LVB) { | |
485 | BUG_ON(lksb->flags & (DLM_LKSB_PUT_LVB|DLM_LKSB_GET_LVB)); | |
486 | lksb->flags |= DLM_LKSB_GET_LVB; | |
487 | } | |
488 | ||
489 | spin_lock(&res->spinlock); | |
490 | status = __dlm_lockres_state_to_status(res); | |
491 | if (status == DLM_NORMAL) { | |
492 | __dlm_lockres_reserve_ast(res); | |
493 | res->state |= DLM_LOCK_RES_IN_PROGRESS; | |
494 | status = __dlmconvert_master(dlm, res, lock, flags, | |
495 | cnv->requested_type, | |
496 | &call_ast, &kick_thread); | |
497 | res->state &= ~DLM_LOCK_RES_IN_PROGRESS; | |
498 | } | |
499 | spin_unlock(&res->spinlock); | |
500 | ||
501 | if (status != DLM_NORMAL) { | |
502 | if (status != DLM_NOTQUEUED) | |
503 | dlm_error(status); | |
504 | lksb->flags &= ~(DLM_LKSB_GET_LVB|DLM_LKSB_PUT_LVB); | |
505 | } | |
506 | ||
507 | leave: | |
508 | if (!lock) | |
509 | mlog(ML_ERROR, "did not find lock to convert on grant queue! " | |
510 | "cookie=%"MLFu64"\n", | |
511 | cnv->cookie); | |
512 | else | |
513 | dlm_lock_put(lock); | |
514 | ||
515 | /* either queue the ast or release it */ | |
516 | if (call_ast) | |
517 | dlm_queue_ast(dlm, lock); | |
518 | else | |
519 | dlm_lockres_release_ast(dlm, res); | |
520 | ||
521 | if (kick_thread) | |
522 | dlm_kick_thread(dlm, res); | |
523 | ||
524 | if (res) | |
525 | dlm_lockres_put(res); | |
526 | ||
527 | dlm_put(dlm); | |
528 | ||
529 | return status; | |
530 | } |