blob: 70888b31e751cd73cfaf8e416be56dc9329d0fe7 [file] [log] [blame]
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001/* -*- 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. */
60static 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);
65static 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 */
78enum 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 */
121static 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
209grant:
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
221switch_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. */
Akinobu Mitaf1166292006-06-26 00:24:46 -0700234 list_move_tail(&lock->list, &res->converting);
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800235
236unlock_exit:
237 spin_unlock(&lock->spinlock);
238 if (status == DLM_DENIED) {
239 __dlm_print_one_lock_resource(res);
240 }
241 if (status == DLM_NORMAL)
242 *kick_thread = 1;
243 return status;
244}
245
246void dlm_revert_pending_convert(struct dlm_lock_resource *res,
247 struct dlm_lock *lock)
248{
249 /* do not alter lock refcount. switching lists. */
Akinobu Mitaf1166292006-06-26 00:24:46 -0700250 list_move_tail(&lock->list, &res->granted);
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800251 lock->ml.convert_type = LKM_IVMODE;
252 lock->lksb->flags &= ~(DLM_LKSB_GET_LVB|DLM_LKSB_PUT_LVB);
253}
254
255/* messages the master site to do lock conversion
256 * locking:
257 * caller needs: none
258 * taken: takes and drops res->spinlock, uses DLM_LOCK_RES_IN_PROGRESS
259 * held on exit: none
260 * returns: DLM_NORMAL, DLM_RECOVERING, status from remote node
261 */
262enum dlm_status dlmconvert_remote(struct dlm_ctxt *dlm,
263 struct dlm_lock_resource *res,
264 struct dlm_lock *lock, int flags, int type)
265{
266 enum dlm_status status;
267
268 mlog(0, "type=%d, convert_type=%d, busy=%d\n", lock->ml.type,
269 lock->ml.convert_type, res->state & DLM_LOCK_RES_IN_PROGRESS);
270
271 spin_lock(&res->spinlock);
272 if (res->state & DLM_LOCK_RES_RECOVERING) {
273 mlog(0, "bailing out early since res is RECOVERING "
274 "on secondary queue\n");
275 /* __dlm_print_one_lock_resource(res); */
276 status = DLM_RECOVERING;
277 goto bail;
278 }
279 /* will exit this call with spinlock held */
280 __dlm_wait_on_lockres(res);
281
282 if (lock->ml.convert_type != LKM_IVMODE) {
283 __dlm_print_one_lock_resource(res);
284 mlog(ML_ERROR, "converting a remote lock that is already "
Kurt Hackel29004852006-03-02 16:43:36 -0800285 "converting! (cookie=%u:%llu, conv=%d)\n",
286 dlm_get_lock_cookie_node(lock->ml.cookie),
287 dlm_get_lock_cookie_seq(lock->ml.cookie),
288 lock->ml.convert_type);
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800289 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. */
Akinobu Mitaf1166292006-06-26 00:24:46 -0700295 list_move_tail(&lock->list, &res->converting);
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800296 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;
320 lock->convert_pending = 0;
321 /* if it failed, move it back to granted queue */
322 if (status != DLM_NORMAL) {
323 if (status != DLM_NOTQUEUED)
324 dlm_error(status);
325 dlm_revert_pending_convert(res, lock);
326 }
327bail:
328 spin_unlock(&res->spinlock);
329
330 /* TODO: should this be a wake_one? */
331 /* wake up any IN_PROGRESS waiters */
332 wake_up(&res->wq);
333
334 return status;
335}
336
337/* sends DLM_CONVERT_LOCK_MSG to master site
338 * locking:
339 * caller needs: none
340 * taken: none
341 * held on exit: none
342 * returns: DLM_NOLOCKMGR, status from remote node
343 */
344static enum dlm_status dlm_send_remote_convert_request(struct dlm_ctxt *dlm,
345 struct dlm_lock_resource *res,
346 struct dlm_lock *lock, int flags, int type)
347{
348 struct dlm_convert_lock convert;
349 int tmpret;
350 enum dlm_status ret;
351 int status = 0;
352 struct kvec vec[2];
353 size_t veclen = 1;
354
355 mlog_entry("%.*s\n", res->lockname.len, res->lockname.name);
356
357 memset(&convert, 0, sizeof(struct dlm_convert_lock));
358 convert.node_idx = dlm->node_num;
359 convert.requested_type = type;
360 convert.cookie = lock->ml.cookie;
361 convert.namelen = res->lockname.len;
362 convert.flags = cpu_to_be32(flags);
363 memcpy(convert.name, res->lockname.name, convert.namelen);
364
365 vec[0].iov_len = sizeof(struct dlm_convert_lock);
366 vec[0].iov_base = &convert;
367
368 if (flags & LKM_PUT_LVB) {
369 /* extra data to send if we are updating lvb */
370 vec[1].iov_len = DLM_LVB_LEN;
371 vec[1].iov_base = lock->lksb->lvb;
372 veclen++;
373 }
374
375 tmpret = o2net_send_message_vec(DLM_CONVERT_LOCK_MSG, dlm->key,
376 vec, veclen, res->owner, &status);
377 if (tmpret >= 0) {
378 // successfully sent and received
379 ret = status; // this is already a dlm_status
380 if (ret == DLM_RECOVERING) {
381 mlog(0, "node %u returned DLM_RECOVERING from convert "
382 "message!\n", res->owner);
383 } else if (ret == DLM_MIGRATING) {
384 mlog(0, "node %u returned DLM_MIGRATING from convert "
385 "message!\n", res->owner);
386 } else if (ret == DLM_FORWARD) {
387 mlog(0, "node %u returned DLM_FORWARD from convert "
388 "message!\n", res->owner);
389 } else if (ret != DLM_NORMAL && ret != DLM_NOTQUEUED)
390 dlm_error(ret);
391 } else {
392 mlog_errno(tmpret);
393 if (dlm_is_host_down(tmpret)) {
Kurt Hackel44465a72006-01-18 17:05:38 -0800394 /* instead of logging the same network error over
395 * and over, sleep here and wait for the heartbeat
396 * to notice the node is dead. times out after 5s. */
397 dlm_wait_for_node_death(dlm, res->owner,
398 DLM_NODE_DEATH_WAIT_MAX);
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800399 ret = DLM_RECOVERING;
400 mlog(0, "node %u died so returning DLM_RECOVERING "
401 "from convert message!\n", res->owner);
402 } else {
403 ret = dlm_err_to_dlm_status(tmpret);
404 }
405 }
406
407 return ret;
408}
409
410/* handler for DLM_CONVERT_LOCK_MSG on master site
411 * locking:
412 * caller needs: none
413 * taken: takes and drop res->spinlock
414 * held on exit: none
415 * returns: DLM_NORMAL, DLM_IVLOCKID, DLM_BADARGS,
416 * status from __dlmconvert_master
417 */
418int dlm_convert_lock_handler(struct o2net_msg *msg, u32 len, void *data)
419{
420 struct dlm_ctxt *dlm = data;
421 struct dlm_convert_lock *cnv = (struct dlm_convert_lock *)msg->buf;
422 struct dlm_lock_resource *res = NULL;
423 struct list_head *iter;
424 struct dlm_lock *lock = NULL;
425 struct dlm_lockstatus *lksb;
426 enum dlm_status status = DLM_NORMAL;
427 u32 flags;
Kurt Hackele2b5e452006-01-18 17:02:56 -0800428 int call_ast = 0, kick_thread = 0, ast_reserved = 0;
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800429
430 if (!dlm_grab(dlm)) {
431 dlm_error(DLM_REJECTED);
432 return DLM_REJECTED;
433 }
434
435 mlog_bug_on_msg(!dlm_domain_fully_joined(dlm),
436 "Domain %s not fully joined!\n", dlm->name);
437
438 if (cnv->namelen > DLM_LOCKID_NAME_MAX) {
439 status = DLM_IVBUFLEN;
440 dlm_error(status);
441 goto leave;
442 }
443
444 flags = be32_to_cpu(cnv->flags);
445
446 if ((flags & (LKM_PUT_LVB|LKM_GET_LVB)) ==
447 (LKM_PUT_LVB|LKM_GET_LVB)) {
448 mlog(ML_ERROR, "both PUT and GET lvb specified\n");
449 status = DLM_BADARGS;
450 goto leave;
451 }
452
453 mlog(0, "lvb: %s\n", flags & LKM_PUT_LVB ? "put lvb" :
454 (flags & LKM_GET_LVB ? "get lvb" : "none"));
455
456 status = DLM_IVLOCKID;
457 res = dlm_lookup_lockres(dlm, cnv->name, cnv->namelen);
458 if (!res) {
459 dlm_error(status);
460 goto leave;
461 }
462
463 spin_lock(&res->spinlock);
464 list_for_each(iter, &res->granted) {
465 lock = list_entry(iter, struct dlm_lock, list);
466 if (lock->ml.cookie == cnv->cookie &&
467 lock->ml.node == cnv->node_idx) {
468 dlm_lock_get(lock);
469 break;
470 }
471 lock = NULL;
472 }
473 spin_unlock(&res->spinlock);
474 if (!lock) {
475 status = DLM_IVLOCKID;
476 dlm_error(status);
477 goto leave;
478 }
479
480 /* found the lock */
481 lksb = lock->lksb;
482
483 /* see if caller needed to get/put lvb */
484 if (flags & LKM_PUT_LVB) {
485 BUG_ON(lksb->flags & (DLM_LKSB_PUT_LVB|DLM_LKSB_GET_LVB));
486 lksb->flags |= DLM_LKSB_PUT_LVB;
487 memcpy(&lksb->lvb[0], &cnv->lvb[0], DLM_LVB_LEN);
488 } else if (flags & LKM_GET_LVB) {
489 BUG_ON(lksb->flags & (DLM_LKSB_PUT_LVB|DLM_LKSB_GET_LVB));
490 lksb->flags |= DLM_LKSB_GET_LVB;
491 }
492
493 spin_lock(&res->spinlock);
494 status = __dlm_lockres_state_to_status(res);
495 if (status == DLM_NORMAL) {
496 __dlm_lockres_reserve_ast(res);
Kurt Hackele2b5e452006-01-18 17:02:56 -0800497 ast_reserved = 1;
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800498 res->state |= DLM_LOCK_RES_IN_PROGRESS;
499 status = __dlmconvert_master(dlm, res, lock, flags,
500 cnv->requested_type,
501 &call_ast, &kick_thread);
502 res->state &= ~DLM_LOCK_RES_IN_PROGRESS;
503 }
504 spin_unlock(&res->spinlock);
505
506 if (status != DLM_NORMAL) {
507 if (status != DLM_NOTQUEUED)
508 dlm_error(status);
509 lksb->flags &= ~(DLM_LKSB_GET_LVB|DLM_LKSB_PUT_LVB);
510 }
511
512leave:
513 if (!lock)
514 mlog(ML_ERROR, "did not find lock to convert on grant queue! "
Kurt Hackel29004852006-03-02 16:43:36 -0800515 "cookie=%u:%llu\n",
516 dlm_get_lock_cookie_node(cnv->cookie),
517 dlm_get_lock_cookie_seq(cnv->cookie));
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800518 else
519 dlm_lock_put(lock);
520
Kurt Hackele2b5e452006-01-18 17:02:56 -0800521 /* either queue the ast or release it, if reserved */
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800522 if (call_ast)
523 dlm_queue_ast(dlm, lock);
Kurt Hackele2b5e452006-01-18 17:02:56 -0800524 else if (ast_reserved)
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800525 dlm_lockres_release_ast(dlm, res);
526
527 if (kick_thread)
528 dlm_kick_thread(dlm, res);
529
530 if (res)
531 dlm_lockres_put(res);
532
533 dlm_put(dlm);
534
535 return status;
536}