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TOMOYO Linux Cross Reference
Linux/fs/ocfs2/dlm/dlmconvert.c

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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/highmem.h>
 32 #include <linux/init.h>
 33 #include <linux/sysctl.h>
 34 #include <linux/random.h>
 35 #include <linux/blkdev.h>
 36 #include <linux/socket.h>
 37 #include <linux/inet.h>
 38 #include <linux/spinlock.h>
 39 
 40 
 41 #include "cluster/heartbeat.h"
 42 #include "cluster/nodemanager.h"
 43 #include "cluster/tcp.h"
 44 
 45 #include "dlmapi.h"
 46 #include "dlmcommon.h"
 47 
 48 #include "dlmconvert.h"
 49 
 50 #define MLOG_MASK_PREFIX ML_DLM
 51 #include "cluster/masklog.h"
 52 
 53 /* NOTE: __dlmconvert_master is the only function in here that
 54  * needs a spinlock held on entry (res->spinlock) and it is the
 55  * only one that holds a lock on exit (res->spinlock).
 56  * All other functions in here need no locks and drop all of
 57  * the locks that they acquire. */
 58 static enum dlm_status __dlmconvert_master(struct dlm_ctxt *dlm,
 59                                            struct dlm_lock_resource *res,
 60                                            struct dlm_lock *lock, int flags,
 61                                            int type, int *call_ast,
 62                                            int *kick_thread);
 63 static enum dlm_status dlm_send_remote_convert_request(struct dlm_ctxt *dlm,
 64                                            struct dlm_lock_resource *res,
 65                                            struct dlm_lock *lock, int flags, int type);
 66 
 67 /*
 68  * this is only called directly by dlmlock(), and only when the
 69  * local node is the owner of the lockres
 70  * locking:
 71  *   caller needs:  none
 72  *   taken:         takes and drops res->spinlock
 73  *   held on exit:  none
 74  * returns: see __dlmconvert_master
 75  */
 76 enum dlm_status dlmconvert_master(struct dlm_ctxt *dlm,
 77                                   struct dlm_lock_resource *res,
 78                                   struct dlm_lock *lock, int flags, int type)
 79 {
 80         int call_ast = 0, kick_thread = 0;
 81         enum dlm_status status;
 82 
 83         spin_lock(&res->spinlock);
 84         /* we are not in a network handler, this is fine */
 85         __dlm_wait_on_lockres(res);
 86         __dlm_lockres_reserve_ast(res);
 87         res->state |= DLM_LOCK_RES_IN_PROGRESS;
 88 
 89         status = __dlmconvert_master(dlm, res, lock, flags, type,
 90                                      &call_ast, &kick_thread);
 91 
 92         res->state &= ~DLM_LOCK_RES_IN_PROGRESS;
 93         spin_unlock(&res->spinlock);
 94         wake_up(&res->wq);
 95         if (status != DLM_NORMAL && status != DLM_NOTQUEUED)
 96                 dlm_error(status);
 97 
 98         /* either queue the ast or release it */
 99         if (call_ast)
100                 dlm_queue_ast(dlm, lock);
101         else
102                 dlm_lockres_release_ast(dlm, res);
103 
104         if (kick_thread)
105                 dlm_kick_thread(dlm, res);
106 
107         return status;
108 }
109 
110 /* performs lock conversion at the lockres master site
111  * locking:
112  *   caller needs:  res->spinlock
113  *   taken:         takes and drops lock->spinlock
114  *   held on exit:  res->spinlock
115  * returns: DLM_NORMAL, DLM_NOTQUEUED, DLM_DENIED
116  *   call_ast: whether ast should be called for this lock
117  *   kick_thread: whether dlm_kick_thread should be called
118  */
119 static enum dlm_status __dlmconvert_master(struct dlm_ctxt *dlm,
120                                            struct dlm_lock_resource *res,
121                                            struct dlm_lock *lock, int flags,
122                                            int type, int *call_ast,
123                                            int *kick_thread)
124 {
125         enum dlm_status status = DLM_NORMAL;
126         struct dlm_lock *tmplock=NULL;
127 
128         assert_spin_locked(&res->spinlock);
129 
130         mlog(0, "type=%d, convert_type=%d, new convert_type=%d\n",
131              lock->ml.type, lock->ml.convert_type, type);
132 
133         spin_lock(&lock->spinlock);
134 
135         /* already converting? */
136         if (lock->ml.convert_type != LKM_IVMODE) {
137                 mlog(ML_ERROR, "attempted to convert a lock with a lock "
138                      "conversion pending\n");
139                 status = DLM_DENIED;
140                 goto unlock_exit;
141         }
142 
143         /* must be on grant queue to convert */
144         if (!dlm_lock_on_list(&res->granted, lock)) {
145                 mlog(ML_ERROR, "attempted to convert a lock not on grant "
146                      "queue\n");
147                 status = DLM_DENIED;
148                 goto unlock_exit;
149         }
150 
151         if (flags & LKM_VALBLK) {
152                 switch (lock->ml.type) {
153                         case LKM_EXMODE:
154                                 /* EX + LKM_VALBLK + convert == set lvb */
155                                 mlog(0, "will set lvb: converting %s->%s\n",
156                                      dlm_lock_mode_name(lock->ml.type),
157                                      dlm_lock_mode_name(type));
158                                 lock->lksb->flags |= DLM_LKSB_PUT_LVB;
159                                 break;
160                         case LKM_PRMODE:
161                         case LKM_NLMODE:
162                                 /* refetch if new level is not NL */
163                                 if (type > LKM_NLMODE) {
164                                         mlog(0, "will fetch new value into "
165                                              "lvb: converting %s->%s\n",
166                                              dlm_lock_mode_name(lock->ml.type),
167                                              dlm_lock_mode_name(type));
168                                         lock->lksb->flags |= DLM_LKSB_GET_LVB;
169                                 } else {
170                                         mlog(0, "will NOT fetch new value "
171                                              "into lvb: converting %s->%s\n",
172                                              dlm_lock_mode_name(lock->ml.type),
173                                              dlm_lock_mode_name(type));
174                                         flags &= ~(LKM_VALBLK);
175                                 }
176                                 break;
177                 }
178         }
179 
180 
181         /* in-place downconvert? */
182         if (type <= lock->ml.type)
183                 goto grant;
184 
185         /* upconvert from here on */
186         status = DLM_NORMAL;
187         list_for_each_entry(tmplock, &res->granted, list) {
188                 if (tmplock == lock)
189                         continue;
190                 if (!dlm_lock_compatible(tmplock->ml.type, type))
191                         goto switch_queues;
192         }
193 
194         list_for_each_entry(tmplock, &res->converting, list) {
195                 if (!dlm_lock_compatible(tmplock->ml.type, type))
196                         goto switch_queues;
197                 /* existing conversion requests take precedence */
198                 if (!dlm_lock_compatible(tmplock->ml.convert_type, type))
199                         goto switch_queues;
200         }
201 
202         /* fall thru to grant */
203 
204 grant:
205         mlog(0, "res %.*s, granting %s lock\n", res->lockname.len,
206              res->lockname.name, dlm_lock_mode_name(type));
207         /* immediately grant the new lock type */
208         lock->lksb->status = DLM_NORMAL;
209         if (lock->ml.node == dlm->node_num)
210                 mlog(0, "doing in-place convert for nonlocal lock\n");
211         lock->ml.type = type;
212         if (lock->lksb->flags & DLM_LKSB_PUT_LVB)
213                 memcpy(res->lvb, lock->lksb->lvb, DLM_LVB_LEN);
214 
215         /*
216          * Move the lock to the tail because it may be the only lock which has
217          * an invalid lvb.
218          */
219         list_move_tail(&lock->list, &res->granted);
220 
221         status = DLM_NORMAL;
222         *call_ast = 1;
223         goto unlock_exit;
224 
225 switch_queues:
226         if (flags & LKM_NOQUEUE) {
227                 mlog(0, "failed to convert NOQUEUE lock %.*s from "
228                      "%d to %d...\n", res->lockname.len, res->lockname.name,
229                      lock->ml.type, type);
230                 status = DLM_NOTQUEUED;
231                 goto unlock_exit;
232         }
233         mlog(0, "res %.*s, queueing...\n", res->lockname.len,
234              res->lockname.name);
235 
236         lock->ml.convert_type = type;
237         /* do not alter lock refcount.  switching lists. */
238         list_move_tail(&lock->list, &res->converting);
239 
240 unlock_exit:
241         spin_unlock(&lock->spinlock);
242         if (status == DLM_DENIED) {
243                 __dlm_print_one_lock_resource(res);
244         }
245         if (status == DLM_NORMAL)
246                 *kick_thread = 1;
247         return status;
248 }
249 
250 void dlm_revert_pending_convert(struct dlm_lock_resource *res,
251                                 struct dlm_lock *lock)
252 {
253         /* do not alter lock refcount.  switching lists. */
254         list_move_tail(&lock->list, &res->granted);
255         lock->ml.convert_type = LKM_IVMODE;
256         lock->lksb->flags &= ~(DLM_LKSB_GET_LVB|DLM_LKSB_PUT_LVB);
257 }
258 
259 /* messages the master site to do lock conversion
260  * locking:
261  *   caller needs:  none
262  *   taken:         takes and drops res->spinlock, uses DLM_LOCK_RES_IN_PROGRESS
263  *   held on exit:  none
264  * returns: DLM_NORMAL, DLM_RECOVERING, status from remote node
265  */
266 enum dlm_status dlmconvert_remote(struct dlm_ctxt *dlm,
267                                   struct dlm_lock_resource *res,
268                                   struct dlm_lock *lock, int flags, int type)
269 {
270         enum dlm_status status;
271 
272         mlog(0, "type=%d, convert_type=%d, busy=%d\n", lock->ml.type,
273              lock->ml.convert_type, res->state & DLM_LOCK_RES_IN_PROGRESS);
274 
275         spin_lock(&res->spinlock);
276         if (res->state & DLM_LOCK_RES_RECOVERING) {
277                 mlog(0, "bailing out early since res is RECOVERING "
278                      "on secondary queue\n");
279                 /* __dlm_print_one_lock_resource(res); */
280                 status = DLM_RECOVERING;
281                 goto bail;
282         }
283         /* will exit this call with spinlock held */
284         __dlm_wait_on_lockres(res);
285 
286         if (lock->ml.convert_type != LKM_IVMODE) {
287                 __dlm_print_one_lock_resource(res);
288                 mlog(ML_ERROR, "converting a remote lock that is already "
289                      "converting! (cookie=%u:%llu, conv=%d)\n",
290                      dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)),
291                      dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)),
292                      lock->ml.convert_type);
293                 status = DLM_DENIED;
294                 goto bail;
295         }
296 
297         if (lock->ml.type == type && lock->ml.convert_type == LKM_IVMODE) {
298                 mlog(0, "last convert request returned DLM_RECOVERING, but "
299                      "owner has already queued and sent ast to me. res %.*s, "
300                      "(cookie=%u:%llu, type=%d, conv=%d)\n",
301                      res->lockname.len, res->lockname.name,
302                      dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)),
303                      dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)),
304                      lock->ml.type, lock->ml.convert_type);
305                 status = DLM_NORMAL;
306                 goto bail;
307         }
308 
309         res->state |= DLM_LOCK_RES_IN_PROGRESS;
310         /* move lock to local convert queue */
311         /* do not alter lock refcount.  switching lists. */
312         list_move_tail(&lock->list, &res->converting);
313         lock->convert_pending = 1;
314         lock->ml.convert_type = type;
315 
316         if (flags & LKM_VALBLK) {
317                 if (lock->ml.type == LKM_EXMODE) {
318                         flags |= LKM_PUT_LVB;
319                         lock->lksb->flags |= DLM_LKSB_PUT_LVB;
320                 } else {
321                         if (lock->ml.convert_type == LKM_NLMODE)
322                                 flags &= ~LKM_VALBLK;
323                         else {
324                                 flags |= LKM_GET_LVB;
325                                 lock->lksb->flags |= DLM_LKSB_GET_LVB;
326                         }
327                 }
328         }
329         spin_unlock(&res->spinlock);
330 
331         /* no locks held here.
332          * need to wait for a reply as to whether it got queued or not. */
333         status = dlm_send_remote_convert_request(dlm, res, lock, flags, type);
334 
335         spin_lock(&res->spinlock);
336         res->state &= ~DLM_LOCK_RES_IN_PROGRESS;
337         /* if it failed, move it back to granted queue.
338          * if master returns DLM_NORMAL and then down before sending ast,
339          * it may have already been moved to granted queue, reset to
340          * DLM_RECOVERING and retry convert */
341         if (status != DLM_NORMAL) {
342                 if (status != DLM_NOTQUEUED)
343                         dlm_error(status);
344                 dlm_revert_pending_convert(res, lock);
345         } else if (!lock->convert_pending) {
346                 mlog(0, "%s: res %.*s, owner died and lock has been moved back "
347                                 "to granted list, retry convert.\n",
348                                 dlm->name, res->lockname.len, res->lockname.name);
349                 status = DLM_RECOVERING;
350         }
351 
352         lock->convert_pending = 0;
353 bail:
354         spin_unlock(&res->spinlock);
355 
356         /* TODO: should this be a wake_one? */
357         /* wake up any IN_PROGRESS waiters */
358         wake_up(&res->wq);
359 
360         return status;
361 }
362 
363 /* sends DLM_CONVERT_LOCK_MSG to master site
364  * locking:
365  *   caller needs:  none
366  *   taken:         none
367  *   held on exit:  none
368  * returns: DLM_NOLOCKMGR, status from remote node
369  */
370 static enum dlm_status dlm_send_remote_convert_request(struct dlm_ctxt *dlm,
371                                            struct dlm_lock_resource *res,
372                                            struct dlm_lock *lock, int flags, int type)
373 {
374         struct dlm_convert_lock convert;
375         int tmpret;
376         enum dlm_status ret;
377         int status = 0;
378         struct kvec vec[2];
379         size_t veclen = 1;
380 
381         mlog(0, "%.*s\n", res->lockname.len, res->lockname.name);
382 
383         memset(&convert, 0, sizeof(struct dlm_convert_lock));
384         convert.node_idx = dlm->node_num;
385         convert.requested_type = type;
386         convert.cookie = lock->ml.cookie;
387         convert.namelen = res->lockname.len;
388         convert.flags = cpu_to_be32(flags);
389         memcpy(convert.name, res->lockname.name, convert.namelen);
390 
391         vec[0].iov_len = sizeof(struct dlm_convert_lock);
392         vec[0].iov_base = &convert;
393 
394         if (flags & LKM_PUT_LVB) {
395                 /* extra data to send if we are updating lvb */
396                 vec[1].iov_len = DLM_LVB_LEN;
397                 vec[1].iov_base = lock->lksb->lvb;
398                 veclen++;
399         }
400 
401         tmpret = o2net_send_message_vec(DLM_CONVERT_LOCK_MSG, dlm->key,
402                                         vec, veclen, res->owner, &status);
403         if (tmpret >= 0) {
404                 // successfully sent and received
405                 ret = status;  // this is already a dlm_status
406                 if (ret == DLM_RECOVERING) {
407                         mlog(0, "node %u returned DLM_RECOVERING from convert "
408                              "message!\n", res->owner);
409                 } else if (ret == DLM_MIGRATING) {
410                         mlog(0, "node %u returned DLM_MIGRATING from convert "
411                              "message!\n", res->owner);
412                 } else if (ret == DLM_FORWARD) {
413                         mlog(0, "node %u returned DLM_FORWARD from convert "
414                              "message!\n", res->owner);
415                 } else if (ret != DLM_NORMAL && ret != DLM_NOTQUEUED)
416                         dlm_error(ret);
417         } else {
418                 mlog(ML_ERROR, "Error %d when sending message %u (key 0x%x) to "
419                      "node %u\n", tmpret, DLM_CONVERT_LOCK_MSG, dlm->key,
420                      res->owner);
421                 if (dlm_is_host_down(tmpret)) {
422                         /* instead of logging the same network error over
423                          * and over, sleep here and wait for the heartbeat
424                          * to notice the node is dead.  times out after 5s. */
425                         dlm_wait_for_node_death(dlm, res->owner,
426                                                 DLM_NODE_DEATH_WAIT_MAX);
427                         ret = DLM_RECOVERING;
428                         mlog(0, "node %u died so returning DLM_RECOVERING "
429                              "from convert message!\n", res->owner);
430                 } else {
431                         ret = dlm_err_to_dlm_status(tmpret);
432                 }
433         }
434 
435         return ret;
436 }
437 
438 /* handler for DLM_CONVERT_LOCK_MSG on master site
439  * locking:
440  *   caller needs:  none
441  *   taken:         takes and drop res->spinlock
442  *   held on exit:  none
443  * returns: DLM_NORMAL, DLM_IVLOCKID, DLM_BADARGS,
444  *          status from __dlmconvert_master
445  */
446 int dlm_convert_lock_handler(struct o2net_msg *msg, u32 len, void *data,
447                              void **ret_data)
448 {
449         struct dlm_ctxt *dlm = data;
450         struct dlm_convert_lock *cnv = (struct dlm_convert_lock *)msg->buf;
451         struct dlm_lock_resource *res = NULL;
452         struct dlm_lock *lock = NULL;
453         struct dlm_lock *tmp_lock;
454         struct dlm_lockstatus *lksb;
455         enum dlm_status status = DLM_NORMAL;
456         u32 flags;
457         int call_ast = 0, kick_thread = 0, ast_reserved = 0, wake = 0;
458 
459         if (!dlm_grab(dlm)) {
460                 dlm_error(DLM_REJECTED);
461                 return DLM_REJECTED;
462         }
463 
464         mlog_bug_on_msg(!dlm_domain_fully_joined(dlm),
465                         "Domain %s not fully joined!\n", dlm->name);
466 
467         if (cnv->namelen > DLM_LOCKID_NAME_MAX) {
468                 status = DLM_IVBUFLEN;
469                 dlm_error(status);
470                 goto leave;
471         }
472 
473         flags = be32_to_cpu(cnv->flags);
474 
475         if ((flags & (LKM_PUT_LVB|LKM_GET_LVB)) ==
476              (LKM_PUT_LVB|LKM_GET_LVB)) {
477                 mlog(ML_ERROR, "both PUT and GET lvb specified\n");
478                 status = DLM_BADARGS;
479                 goto leave;
480         }
481 
482         mlog(0, "lvb: %s\n", flags & LKM_PUT_LVB ? "put lvb" :
483              (flags & LKM_GET_LVB ? "get lvb" : "none"));
484 
485         status = DLM_IVLOCKID;
486         res = dlm_lookup_lockres(dlm, cnv->name, cnv->namelen);
487         if (!res) {
488                 dlm_error(status);
489                 goto leave;
490         }
491 
492         spin_lock(&res->spinlock);
493         status = __dlm_lockres_state_to_status(res);
494         if (status != DLM_NORMAL) {
495                 spin_unlock(&res->spinlock);
496                 dlm_error(status);
497                 goto leave;
498         }
499         list_for_each_entry(tmp_lock, &res->granted, list) {
500                 if (tmp_lock->ml.cookie == cnv->cookie &&
501                     tmp_lock->ml.node == cnv->node_idx) {
502                         lock = tmp_lock;
503                         dlm_lock_get(lock);
504                         break;
505                 }
506         }
507         spin_unlock(&res->spinlock);
508         if (!lock) {
509                 status = DLM_IVLOCKID;
510                 mlog(ML_ERROR, "did not find lock to convert on grant queue! "
511                                "cookie=%u:%llu\n",
512                      dlm_get_lock_cookie_node(be64_to_cpu(cnv->cookie)),
513                      dlm_get_lock_cookie_seq(be64_to_cpu(cnv->cookie)));
514                 dlm_print_one_lock_resource(res);
515                 goto leave;
516         }
517 
518         /* found the lock */
519         lksb = lock->lksb;
520 
521         /* see if caller needed to get/put lvb */
522         if (flags & LKM_PUT_LVB) {
523                 BUG_ON(lksb->flags & (DLM_LKSB_PUT_LVB|DLM_LKSB_GET_LVB));
524                 lksb->flags |= DLM_LKSB_PUT_LVB;
525                 memcpy(&lksb->lvb[0], &cnv->lvb[0], DLM_LVB_LEN);
526         } else if (flags & LKM_GET_LVB) {
527                 BUG_ON(lksb->flags & (DLM_LKSB_PUT_LVB|DLM_LKSB_GET_LVB));
528                 lksb->flags |= DLM_LKSB_GET_LVB;
529         }
530 
531         spin_lock(&res->spinlock);
532         status = __dlm_lockres_state_to_status(res);
533         if (status == DLM_NORMAL) {
534                 __dlm_lockres_reserve_ast(res);
535                 ast_reserved = 1;
536                 res->state |= DLM_LOCK_RES_IN_PROGRESS;
537                 status = __dlmconvert_master(dlm, res, lock, flags,
538                                              cnv->requested_type,
539                                              &call_ast, &kick_thread);
540                 res->state &= ~DLM_LOCK_RES_IN_PROGRESS;
541                 wake = 1;
542         }
543         spin_unlock(&res->spinlock);
544         if (wake)
545                 wake_up(&res->wq);
546 
547         if (status != DLM_NORMAL) {
548                 if (status != DLM_NOTQUEUED)
549                         dlm_error(status);
550                 lksb->flags &= ~(DLM_LKSB_GET_LVB|DLM_LKSB_PUT_LVB);
551         }
552 
553 leave:
554         if (lock)
555                 dlm_lock_put(lock);
556 
557         /* either queue the ast or release it, if reserved */
558         if (call_ast)
559                 dlm_queue_ast(dlm, lock);
560         else if (ast_reserved)
561                 dlm_lockres_release_ast(dlm, res);
562 
563         if (kick_thread)
564                 dlm_kick_thread(dlm, res);
565 
566         if (res)
567                 dlm_lockres_put(res);
568 
569         dlm_put(dlm);
570 
571         return status;
572 }
573 

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