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ocfs2: Check for refreshing locks in generic unblock function
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / ocfs2 / dlmglue.c
CommitLineData
ccd979bd
MF		 1/* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
3 *
4 * dlmglue.c
5 *
6 * Code which implements an OCFS2 specific interface to our DLM.
7 *
8 * Copyright (C) 2003, 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#include <linux/types.h>
27#include <linux/slab.h>
28#include <linux/highmem.h>
29#include <linux/mm.h>
30#include <linux/smp_lock.h>
31#include <linux/crc32.h>
32#include <linux/kthread.h>
33#include <linux/pagemap.h>
34#include <linux/debugfs.h>
35#include <linux/seq_file.h>
36
37#include <cluster/heartbeat.h>
38#include <cluster/nodemanager.h>
39#include <cluster/tcp.h>
40
41#include <dlm/dlmapi.h>
42
43#define MLOG_MASK_PREFIX ML_DLM_GLUE
44#include <cluster/masklog.h>
45
46#include "ocfs2.h"
47
48#include "alloc.h"
d680efe9 49#include "dcache.h"
ccd979bd
MF		 50#include "dlmglue.h"
51#include "extent_map.h"
52#include "heartbeat.h"
53#include "inode.h"
54#include "journal.h"
55#include "slot_map.h"
56#include "super.h"
57#include "uptodate.h"
58#include "vote.h"
59
60#include "buffer_head_io.h"
61
62struct ocfs2_mask_waiter {
63 struct list_head mw_item;
64 int mw_status;
65 struct completion mw_complete;
66 unsigned long mw_mask;
67 unsigned long mw_goal;
68};
69
54a7e755
MF		 70static struct ocfs2_super *ocfs2_get_dentry_osb(struct ocfs2_lock_res *lockres);
71static struct ocfs2_super *ocfs2_get_inode_osb(struct ocfs2_lock_res *lockres);
ccd979bd 72
d680efe9
MF		 73/*
74 * Return value from ocfs2_convert_worker_t functions.
75 *
76 * These control the precise actions of ocfs2_generic_unblock_lock()
77 * and ocfs2_process_blocked_lock()
78 *
79 */
80enum ocfs2_unblock_action {
81 UNBLOCK_CONTINUE = 0, /* Continue downconvert */
82 UNBLOCK_CONTINUE_POST = 1, /* Continue downconvert, fire
83 * ->post_unlock callback */
84 UNBLOCK_STOP_POST = 2, /* Do not downconvert, fire
85 * ->post_unlock() callback. */
86};
87
88struct ocfs2_unblock_ctl {
89 int requeue;
90 enum ocfs2_unblock_action unblock_action;
91};
92
ccd979bd 93static int ocfs2_unblock_meta(struct ocfs2_lock_res *lockres,
d680efe9 94 struct ocfs2_unblock_ctl *ctl);
ccd979bd 95static int ocfs2_unblock_data(struct ocfs2_lock_res *lockres,
d680efe9 96 struct ocfs2_unblock_ctl *ctl);
ccd979bd 97static int ocfs2_unblock_inode_lock(struct ocfs2_lock_res *lockres,
d680efe9
MF		 98 struct ocfs2_unblock_ctl *ctl);
99static int ocfs2_unblock_dentry_lock(struct ocfs2_lock_res *lockres,
100 struct ocfs2_unblock_ctl *ctl);
ccd979bd 101static int ocfs2_unblock_osb_lock(struct ocfs2_lock_res *lockres,
d680efe9
MF		 102 struct ocfs2_unblock_ctl *ctl);
103
104static void ocfs2_dentry_post_unlock(struct ocfs2_super *osb,
105 struct ocfs2_lock_res *lockres);
ccd979bd 106
f625c979
MF		 107/*
108 * OCFS2 Lock Resource Operations
109 *
110 * These fine tune the behavior of the generic dlmglue locking infrastructure.
111 */
ccd979bd 112struct ocfs2_lock_res_ops {
54a7e755
MF		 113 /*
114 * Translate an ocfs2_lock_res * into an ocfs2_super *. Define
115 * this callback if ->l_priv is not an ocfs2_super pointer
116 */
117 struct ocfs2_super * (*get_osb)(struct ocfs2_lock_res *);
d680efe9
MF		 118 int (*unblock)(struct ocfs2_lock_res *, struct ocfs2_unblock_ctl *);
119 void (*post_unlock)(struct ocfs2_super *, struct ocfs2_lock_res *);
f625c979
MF		 120
121 /*
122 * LOCK_TYPE_* flags which describe the specific requirements
123 * of a lock type. Descriptions of each individual flag follow.
124 */
125 int flags;
ccd979bd
MF		 126};
127
f625c979
MF		 128/*
129 * Some locks want to "refresh" potentially stale data when a
130 * meaningful (PRMODE or EXMODE) lock level is first obtained. If this
131 * flag is set, the OCFS2_LOCK_NEEDS_REFRESH flag will be set on the
132 * individual lockres l_flags member from the ast function. It is
133 * expected that the locking wrapper will clear the
134 * OCFS2_LOCK_NEEDS_REFRESH flag when done.
135 */
136#define LOCK_TYPE_REQUIRES_REFRESH 0x1
137
b80fc012
MF		 138/*
139 * Indicate that a lock type makes use of the lock value block.
140 */
141#define LOCK_TYPE_USES_LVB 0x2
142
d680efe9
MF		 143typedef int (ocfs2_convert_worker_t)(struct ocfs2_lock_res *, int);
144static int ocfs2_generic_unblock_lock(struct ocfs2_super *osb,
145 struct ocfs2_lock_res *lockres,
146 struct ocfs2_unblock_ctl *ctl,
147 ocfs2_convert_worker_t *worker);
148
ccd979bd 149static struct ocfs2_lock_res_ops ocfs2_inode_rw_lops = {
54a7e755 150 .get_osb = ocfs2_get_inode_osb,
ccd979bd 151 .unblock = ocfs2_unblock_inode_lock,
f625c979 152 .flags = 0,
ccd979bd
MF		 153};
154
155static struct ocfs2_lock_res_ops ocfs2_inode_meta_lops = {
54a7e755 156 .get_osb = ocfs2_get_inode_osb,
ccd979bd 157 .unblock = ocfs2_unblock_meta,
b80fc012 158 .flags = LOCK_TYPE_REQUIRES_REFRESH|LOCK_TYPE_USES_LVB,
ccd979bd
MF		 159};
160
ccd979bd 161static struct ocfs2_lock_res_ops ocfs2_inode_data_lops = {
54a7e755 162 .get_osb = ocfs2_get_inode_osb,
ccd979bd 163 .unblock = ocfs2_unblock_data,
f625c979 164 .flags = 0,
ccd979bd
MF		 165};
166
167static struct ocfs2_lock_res_ops ocfs2_super_lops = {
ccd979bd 168 .unblock = ocfs2_unblock_osb_lock,
f625c979 169 .flags = LOCK_TYPE_REQUIRES_REFRESH,
ccd979bd
MF		 170};
171
172static struct ocfs2_lock_res_ops ocfs2_rename_lops = {
ccd979bd 173 .unblock = ocfs2_unblock_osb_lock,
f625c979 174 .flags = 0,
ccd979bd
MF		 175};
176
d680efe9 177static struct ocfs2_lock_res_ops ocfs2_dentry_lops = {
54a7e755 178 .get_osb = ocfs2_get_dentry_osb,
d680efe9
MF		 179 .unblock = ocfs2_unblock_dentry_lock,
180 .post_unlock = ocfs2_dentry_post_unlock,
f625c979 181 .flags = 0,
d680efe9
MF		 182};
183
ccd979bd
MF		 184static inline int ocfs2_is_inode_lock(struct ocfs2_lock_res *lockres)
185{
186 return lockres->l_type == OCFS2_LOCK_TYPE_META ||
187 lockres->l_type == OCFS2_LOCK_TYPE_DATA ||
188 lockres->l_type == OCFS2_LOCK_TYPE_RW;
189}
190
ccd979bd
MF		 191static inline struct inode *ocfs2_lock_res_inode(struct ocfs2_lock_res *lockres)
192{
193 BUG_ON(!ocfs2_is_inode_lock(lockres));
194
195 return (struct inode *) lockres->l_priv;
196}
197
d680efe9
MF		 198static inline struct ocfs2_dentry_lock *ocfs2_lock_res_dl(struct ocfs2_lock_res *lockres)
199{
200 BUG_ON(lockres->l_type != OCFS2_LOCK_TYPE_DENTRY);
201
202 return (struct ocfs2_dentry_lock *)lockres->l_priv;
203}
204
54a7e755
MF		 205static inline struct ocfs2_super *ocfs2_get_lockres_osb(struct ocfs2_lock_res *lockres)
206{
207 if (lockres->l_ops->get_osb)
208 return lockres->l_ops->get_osb(lockres);
209
210 return (struct ocfs2_super *)lockres->l_priv;
211}
212
ccd979bd
MF		 213static int ocfs2_lock_create(struct ocfs2_super *osb,
214 struct ocfs2_lock_res *lockres,
215 int level,
216 int dlm_flags);
217static inline int ocfs2_may_continue_on_blocked_lock(struct ocfs2_lock_res *lockres,
218 int wanted);
219static void ocfs2_cluster_unlock(struct ocfs2_super *osb,
220 struct ocfs2_lock_res *lockres,
221 int level);
222static inline void ocfs2_generic_handle_downconvert_action(struct ocfs2_lock_res *lockres);
223static inline void ocfs2_generic_handle_convert_action(struct ocfs2_lock_res *lockres);
224static inline void ocfs2_generic_handle_attach_action(struct ocfs2_lock_res *lockres);
225static int ocfs2_generic_handle_bast(struct ocfs2_lock_res *lockres, int level);
226static void ocfs2_schedule_blocked_lock(struct ocfs2_super *osb,
227 struct ocfs2_lock_res *lockres);
228static inline void ocfs2_recover_from_dlm_error(struct ocfs2_lock_res *lockres,
229 int convert);
230#define ocfs2_log_dlm_error(_func, _stat, _lockres) do { \
231 mlog(ML_ERROR, "Dlm error \"%s\" while calling %s on " \
232 "resource %s: %s\n", dlm_errname(_stat), _func, \
233 _lockres->l_name, dlm_errmsg(_stat)); \
234} while (0)
235static void ocfs2_vote_on_unlock(struct ocfs2_super *osb,
236 struct ocfs2_lock_res *lockres);
237static int ocfs2_meta_lock_update(struct inode *inode,
238 struct buffer_head **bh);
239static void ocfs2_drop_osb_locks(struct ocfs2_super *osb);
240static inline int ocfs2_highest_compat_lock_level(int level);
241static inline int ocfs2_can_downconvert_meta_lock(struct inode *inode,
242 struct ocfs2_lock_res *lockres,
243 int new_level);
244
ccd979bd
MF		 245static void ocfs2_build_lock_name(enum ocfs2_lock_type type,
246 u64 blkno,
247 u32 generation,
248 char *name)
249{
250 int len;
251
252 mlog_entry_void();
253
254 BUG_ON(type >= OCFS2_NUM_LOCK_TYPES);
255
b0697053
MF		 256 len = snprintf(name, OCFS2_LOCK_ID_MAX_LEN, "%c%s%016llx%08x",
257 ocfs2_lock_type_char(type), OCFS2_LOCK_ID_PAD,
258 (long long)blkno, generation);
ccd979bd
MF		 259
260 BUG_ON(len != (OCFS2_LOCK_ID_MAX_LEN - 1));
261
262 mlog(0, "built lock resource with name: %s\n", name);
263
264 mlog_exit_void();
265}
266
34af946a 267static DEFINE_SPINLOCK(ocfs2_dlm_tracking_lock);
ccd979bd
MF		 268
269static void ocfs2_add_lockres_tracking(struct ocfs2_lock_res *res,
270 struct ocfs2_dlm_debug *dlm_debug)
271{
272 mlog(0, "Add tracking for lockres %s\n", res->l_name);
273
274 spin_lock(&ocfs2_dlm_tracking_lock);
275 list_add(&res->l_debug_list, &dlm_debug->d_lockres_tracking);
276 spin_unlock(&ocfs2_dlm_tracking_lock);
277}
278
279static void ocfs2_remove_lockres_tracking(struct ocfs2_lock_res *res)
280{
281 spin_lock(&ocfs2_dlm_tracking_lock);
282 if (!list_empty(&res->l_debug_list))
283 list_del_init(&res->l_debug_list);
284 spin_unlock(&ocfs2_dlm_tracking_lock);
285}
286
287static void ocfs2_lock_res_init_common(struct ocfs2_super *osb,
288 struct ocfs2_lock_res *res,
289 enum ocfs2_lock_type type,
ccd979bd
MF		 290 struct ocfs2_lock_res_ops *ops,
291 void *priv)
292{
ccd979bd
MF		 293 res->l_type = type;
294 res->l_ops = ops;
295 res->l_priv = priv;
296
297 res->l_level = LKM_IVMODE;
298 res->l_requested = LKM_IVMODE;
299 res->l_blocking = LKM_IVMODE;
300 res->l_action = OCFS2_AST_INVALID;
301 res->l_unlock_action = OCFS2_UNLOCK_INVALID;
302
303 res->l_flags = OCFS2_LOCK_INITIALIZED;
304
305 ocfs2_add_lockres_tracking(res, osb->osb_dlm_debug);
306}
307
308void ocfs2_lock_res_init_once(struct ocfs2_lock_res *res)
309{
310 /* This also clears out the lock status block */
311 memset(res, 0, sizeof(struct ocfs2_lock_res));
312 spin_lock_init(&res->l_lock);
313 init_waitqueue_head(&res->l_event);
314 INIT_LIST_HEAD(&res->l_blocked_list);
315 INIT_LIST_HEAD(&res->l_mask_waiters);
316}
317
318void ocfs2_inode_lock_res_init(struct ocfs2_lock_res *res,
319 enum ocfs2_lock_type type,
24c19ef4 320 unsigned int generation,
ccd979bd
MF		 321 struct inode *inode)
322{
323 struct ocfs2_lock_res_ops *ops;
324
325 switch(type) {
326 case OCFS2_LOCK_TYPE_RW:
327 ops = &ocfs2_inode_rw_lops;
328 break;
329 case OCFS2_LOCK_TYPE_META:
330 ops = &ocfs2_inode_meta_lops;
331 break;
332 case OCFS2_LOCK_TYPE_DATA:
333 ops = &ocfs2_inode_data_lops;
334 break;
335 default:
336 mlog_bug_on_msg(1, "type: %d\n", type);
337 ops = NULL; /* thanks, gcc */
338 break;
339 };
340
d680efe9 341 ocfs2_build_lock_name(type, OCFS2_I(inode)->ip_blkno,
24c19ef4 342 generation, res->l_name);
d680efe9
MF		 343 ocfs2_lock_res_init_common(OCFS2_SB(inode->i_sb), res, type, ops, inode);
344}
345
54a7e755
MF		 346static struct ocfs2_super *ocfs2_get_inode_osb(struct ocfs2_lock_res *lockres)
347{
348 struct inode *inode = ocfs2_lock_res_inode(lockres);
349
350 return OCFS2_SB(inode->i_sb);
351}
352
d680efe9
MF		 353static __u64 ocfs2_get_dentry_lock_ino(struct ocfs2_lock_res *lockres)
354{
355 __be64 inode_blkno_be;
356
357 memcpy(&inode_blkno_be, &lockres->l_name[OCFS2_DENTRY_LOCK_INO_START],
358 sizeof(__be64));
359
360 return be64_to_cpu(inode_blkno_be);
361}
362
54a7e755
MF		 363static struct ocfs2_super *ocfs2_get_dentry_osb(struct ocfs2_lock_res *lockres)
364{
365 struct ocfs2_dentry_lock *dl = lockres->l_priv;
366
367 return OCFS2_SB(dl->dl_inode->i_sb);
368}
369
d680efe9
MF		 370void ocfs2_dentry_lock_res_init(struct ocfs2_dentry_lock *dl,
371 u64 parent, struct inode *inode)
372{
373 int len;
374 u64 inode_blkno = OCFS2_I(inode)->ip_blkno;
375 __be64 inode_blkno_be = cpu_to_be64(inode_blkno);
376 struct ocfs2_lock_res *lockres = &dl->dl_lockres;
377
378 ocfs2_lock_res_init_once(lockres);
379
380 /*
381 * Unfortunately, the standard lock naming scheme won't work
382 * here because we have two 16 byte values to use. Instead,
383 * we'll stuff the inode number as a binary value. We still
384 * want error prints to show something without garbling the
385 * display, so drop a null byte in there before the inode
386 * number. A future version of OCFS2 will likely use all
387 * binary lock names. The stringified names have been a
388 * tremendous aid in debugging, but now that the debugfs
389 * interface exists, we can mangle things there if need be.
390 *
391 * NOTE: We also drop the standard "pad" value (the total lock
392 * name size stays the same though - the last part is all
393 * zeros due to the memset in ocfs2_lock_res_init_once()
394 */
395 len = snprintf(lockres->l_name, OCFS2_DENTRY_LOCK_INO_START,
396 "%c%016llx",
397 ocfs2_lock_type_char(OCFS2_LOCK_TYPE_DENTRY),
398 (long long)parent);
399
400 BUG_ON(len != (OCFS2_DENTRY_LOCK_INO_START - 1));
401
402 memcpy(&lockres->l_name[OCFS2_DENTRY_LOCK_INO_START], &inode_blkno_be,
403 sizeof(__be64));
404
405 ocfs2_lock_res_init_common(OCFS2_SB(inode->i_sb), lockres,
406 OCFS2_LOCK_TYPE_DENTRY, &ocfs2_dentry_lops,
407 dl);
ccd979bd
MF		 408}
409
410static void ocfs2_super_lock_res_init(struct ocfs2_lock_res *res,
411 struct ocfs2_super *osb)
412{
413 /* Superblock lockres doesn't come from a slab so we call init
414 * once on it manually. */
415 ocfs2_lock_res_init_once(res);
d680efe9
MF		 416 ocfs2_build_lock_name(OCFS2_LOCK_TYPE_SUPER, OCFS2_SUPER_BLOCK_BLKNO,
417 0, res->l_name);
ccd979bd 418 ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_SUPER,
ccd979bd
MF		 419 &ocfs2_super_lops, osb);
420}
421
422static void ocfs2_rename_lock_res_init(struct ocfs2_lock_res *res,
423 struct ocfs2_super *osb)
424{
425 /* Rename lockres doesn't come from a slab so we call init
426 * once on it manually. */
427 ocfs2_lock_res_init_once(res);
d680efe9
MF		 428 ocfs2_build_lock_name(OCFS2_LOCK_TYPE_RENAME, 0, 0, res->l_name);
429 ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_RENAME,
ccd979bd
MF		 430 &ocfs2_rename_lops, osb);
431}
432
433void ocfs2_lock_res_free(struct ocfs2_lock_res *res)
434{
435 mlog_entry_void();
436
437 if (!(res->l_flags & OCFS2_LOCK_INITIALIZED))
438 return;
439
440 ocfs2_remove_lockres_tracking(res);
441
442 mlog_bug_on_msg(!list_empty(&res->l_blocked_list),
443 "Lockres %s is on the blocked list\n",
444 res->l_name);
445 mlog_bug_on_msg(!list_empty(&res->l_mask_waiters),
446 "Lockres %s has mask waiters pending\n",
447 res->l_name);
448 mlog_bug_on_msg(spin_is_locked(&res->l_lock),
449 "Lockres %s is locked\n",
450 res->l_name);
451 mlog_bug_on_msg(res->l_ro_holders,
452 "Lockres %s has %u ro holders\n",
453 res->l_name, res->l_ro_holders);
454 mlog_bug_on_msg(res->l_ex_holders,
455 "Lockres %s has %u ex holders\n",
456 res->l_name, res->l_ex_holders);
457
458 /* Need to clear out the lock status block for the dlm */
459 memset(&res->l_lksb, 0, sizeof(res->l_lksb));
460
461 res->l_flags = 0UL;
462 mlog_exit_void();
463}
464
465static inline void ocfs2_inc_holders(struct ocfs2_lock_res *lockres,
466 int level)
467{
468 mlog_entry_void();
469
470 BUG_ON(!lockres);
471
472 switch(level) {
473 case LKM_EXMODE:
474 lockres->l_ex_holders++;
475 break;
476 case LKM_PRMODE:
477 lockres->l_ro_holders++;
478 break;
479 default:
480 BUG();
481 }
482
483 mlog_exit_void();
484}
485
486static inline void ocfs2_dec_holders(struct ocfs2_lock_res *lockres,
487 int level)
488{
489 mlog_entry_void();
490
491 BUG_ON(!lockres);
492
493 switch(level) {
494 case LKM_EXMODE:
495 BUG_ON(!lockres->l_ex_holders);
496 lockres->l_ex_holders--;
497 break;
498 case LKM_PRMODE:
499 BUG_ON(!lockres->l_ro_holders);
500 lockres->l_ro_holders--;
501 break;
502 default:
503 BUG();
504 }
505 mlog_exit_void();
506}
507
508/* WARNING: This function lives in a world where the only three lock
509 * levels are EX, PR, and NL. It *will* have to be adjusted when more
510 * lock types are added. */
511static inline int ocfs2_highest_compat_lock_level(int level)
512{
513 int new_level = LKM_EXMODE;
514
515 if (level == LKM_EXMODE)
516 new_level = LKM_NLMODE;
517 else if (level == LKM_PRMODE)
518 new_level = LKM_PRMODE;
519 return new_level;
520}
521
522static void lockres_set_flags(struct ocfs2_lock_res *lockres,
523 unsigned long newflags)
524{
525 struct list_head *pos, *tmp;
526 struct ocfs2_mask_waiter *mw;
527
528 assert_spin_locked(&lockres->l_lock);
529
530 lockres->l_flags = newflags;
531
532 list_for_each_safe(pos, tmp, &lockres->l_mask_waiters) {
533 mw = list_entry(pos, struct ocfs2_mask_waiter, mw_item);
534 if ((lockres->l_flags & mw->mw_mask) != mw->mw_goal)
535 continue;
536
537 list_del_init(&mw->mw_item);
538 mw->mw_status = 0;
539 complete(&mw->mw_complete);
540 }
541}
542static void lockres_or_flags(struct ocfs2_lock_res *lockres, unsigned long or)
543{
544 lockres_set_flags(lockres, lockres->l_flags | or);
545}
546static void lockres_clear_flags(struct ocfs2_lock_res *lockres,
547 unsigned long clear)
548{
549 lockres_set_flags(lockres, lockres->l_flags & ~clear);
550}
551
552static inline void ocfs2_generic_handle_downconvert_action(struct ocfs2_lock_res *lockres)
553{
554 mlog_entry_void();
555
556 BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY));
557 BUG_ON(!(lockres->l_flags & OCFS2_LOCK_ATTACHED));
558 BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED));
559 BUG_ON(lockres->l_blocking <= LKM_NLMODE);
560
561 lockres->l_level = lockres->l_requested;
562 if (lockres->l_level <=
563 ocfs2_highest_compat_lock_level(lockres->l_blocking)) {
564 lockres->l_blocking = LKM_NLMODE;
565 lockres_clear_flags(lockres, OCFS2_LOCK_BLOCKED);
566 }
567 lockres_clear_flags(lockres, OCFS2_LOCK_BUSY);
568
569 mlog_exit_void();
570}
571
572static inline void ocfs2_generic_handle_convert_action(struct ocfs2_lock_res *lockres)
573{
574 mlog_entry_void();
575
576 BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY));
577 BUG_ON(!(lockres->l_flags & OCFS2_LOCK_ATTACHED));
578
579 /* Convert from RO to EX doesn't really need anything as our
580 * information is already up to data. Convert from NL to
581 * *anything* however should mark ourselves as needing an
582 * update */
f625c979
MF		 583 if (lockres->l_level == LKM_NLMODE &&
584 lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH)
ccd979bd
MF		 585 lockres_or_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH);
586
587 lockres->l_level = lockres->l_requested;
588 lockres_clear_flags(lockres, OCFS2_LOCK_BUSY);
589
590 mlog_exit_void();
591}
592
593static inline void ocfs2_generic_handle_attach_action(struct ocfs2_lock_res *lockres)
594{
595 mlog_entry_void();
596
597 BUG_ON((!lockres->l_flags & OCFS2_LOCK_BUSY));
598 BUG_ON(lockres->l_flags & OCFS2_LOCK_ATTACHED);
599
600 if (lockres->l_requested > LKM_NLMODE &&
f625c979
MF		 601 !(lockres->l_flags & OCFS2_LOCK_LOCAL) &&
602 lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH)
ccd979bd
MF		 603 lockres_or_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH);
604
605 lockres->l_level = lockres->l_requested;
606 lockres_or_flags(lockres, OCFS2_LOCK_ATTACHED);
607 lockres_clear_flags(lockres, OCFS2_LOCK_BUSY);
608
609 mlog_exit_void();
610}
611
ccd979bd
MF		 612static int ocfs2_generic_handle_bast(struct ocfs2_lock_res *lockres,
613 int level)
614{
615 int needs_downconvert = 0;
616 mlog_entry_void();
617
618 assert_spin_locked(&lockres->l_lock);
619
620 lockres_or_flags(lockres, OCFS2_LOCK_BLOCKED);
621
622 if (level > lockres->l_blocking) {
623 /* only schedule a downconvert if we haven't already scheduled
624 * one that goes low enough to satisfy the level we're
625 * blocking. this also catches the case where we get
626 * duplicate BASTs */
627 if (ocfs2_highest_compat_lock_level(level) <
628 ocfs2_highest_compat_lock_level(lockres->l_blocking))
629 needs_downconvert = 1;
630
631 lockres->l_blocking = level;
632 }
633
634 mlog_exit(needs_downconvert);
635 return needs_downconvert;
636}
637
aa2623ad 638static void ocfs2_blocking_ast(void *opaque, int level)
ccd979bd 639{
aa2623ad
MF		 640 struct ocfs2_lock_res *lockres = opaque;
641 struct ocfs2_super *osb = ocfs2_get_lockres_osb(lockres);
ccd979bd
MF		 642 int needs_downconvert;
643 unsigned long flags;
644
ccd979bd
MF		 645 BUG_ON(level <= LKM_NLMODE);
646
aa2623ad
MF		 647 mlog(0, "BAST fired for lockres %s, blocking %d, level %d type %s\n",
648 lockres->l_name, level, lockres->l_level,
649 ocfs2_lock_type_string(lockres->l_type));
650
ccd979bd
MF		 651 spin_lock_irqsave(&lockres->l_lock, flags);
652 needs_downconvert = ocfs2_generic_handle_bast(lockres, level);
653 if (needs_downconvert)
654 ocfs2_schedule_blocked_lock(osb, lockres);
655 spin_unlock_irqrestore(&lockres->l_lock, flags);
656
d680efe9
MF		 657 wake_up(&lockres->l_event);
658
ccd979bd 659 ocfs2_kick_vote_thread(osb);
ccd979bd
MF		 660}
661
e92d57df 662static void ocfs2_locking_ast(void *opaque)
ccd979bd 663{
e92d57df 664 struct ocfs2_lock_res *lockres = opaque;
ccd979bd
MF		 665 struct dlm_lockstatus *lksb = &lockres->l_lksb;
666 unsigned long flags;
667
668 spin_lock_irqsave(&lockres->l_lock, flags);
669
670 if (lksb->status != DLM_NORMAL) {
671 mlog(ML_ERROR, "lockres %s: lksb status value of %u!\n",
672 lockres->l_name, lksb->status);
673 spin_unlock_irqrestore(&lockres->l_lock, flags);
674 return;
675 }
676
677 switch(lockres->l_action) {
678 case OCFS2_AST_ATTACH:
679 ocfs2_generic_handle_attach_action(lockres);
e92d57df 680 lockres_clear_flags(lockres, OCFS2_LOCK_LOCAL);
ccd979bd
MF		 681 break;
682 case OCFS2_AST_CONVERT:
683 ocfs2_generic_handle_convert_action(lockres);
684 break;
685 case OCFS2_AST_DOWNCONVERT:
686 ocfs2_generic_handle_downconvert_action(lockres);
687 break;
688 default:
e92d57df
MF		 689 mlog(ML_ERROR, "lockres %s: ast fired with invalid action: %u "
690 "lockres flags = 0x%lx, unlock action: %u\n",
691 lockres->l_name, lockres->l_action, lockres->l_flags,
692 lockres->l_unlock_action);
ccd979bd
MF		 693 BUG();
694 }
695
ccd979bd
MF		 696 /* set it to something invalid so if we get called again we
697 * can catch it. */
698 lockres->l_action = OCFS2_AST_INVALID;
ccd979bd
MF		 699
700 wake_up(&lockres->l_event);
d680efe9 701 spin_unlock_irqrestore(&lockres->l_lock, flags);
ccd979bd
MF		 702}
703
ccd979bd
MF		 704static inline void ocfs2_recover_from_dlm_error(struct ocfs2_lock_res *lockres,
705 int convert)
706{
707 unsigned long flags;
708
709 mlog_entry_void();
710 spin_lock_irqsave(&lockres->l_lock, flags);
711 lockres_clear_flags(lockres, OCFS2_LOCK_BUSY);
712 if (convert)
713 lockres->l_action = OCFS2_AST_INVALID;
714 else
715 lockres->l_unlock_action = OCFS2_UNLOCK_INVALID;
716 spin_unlock_irqrestore(&lockres->l_lock, flags);
717
718 wake_up(&lockres->l_event);
719 mlog_exit_void();
720}
721
722/* Note: If we detect another process working on the lock (i.e.,
723 * OCFS2_LOCK_BUSY), we'll bail out returning 0. It's up to the caller
724 * to do the right thing in that case.
725 */
726static int ocfs2_lock_create(struct ocfs2_super *osb,
727 struct ocfs2_lock_res *lockres,
728 int level,
729 int dlm_flags)
730{
731 int ret = 0;
732 enum dlm_status status;
733 unsigned long flags;
734
735 mlog_entry_void();
736
737 mlog(0, "lock %s, level = %d, flags = %d\n", lockres->l_name, level,
738 dlm_flags);
739
740 spin_lock_irqsave(&lockres->l_lock, flags);
741 if ((lockres->l_flags & OCFS2_LOCK_ATTACHED) ||
742 (lockres->l_flags & OCFS2_LOCK_BUSY)) {
743 spin_unlock_irqrestore(&lockres->l_lock, flags);
744 goto bail;
745 }
746
747 lockres->l_action = OCFS2_AST_ATTACH;
748 lockres->l_requested = level;
749 lockres_or_flags(lockres, OCFS2_LOCK_BUSY);
750 spin_unlock_irqrestore(&lockres->l_lock, flags);
751
752 status = dlmlock(osb->dlm,
753 level,
754 &lockres->l_lksb,
755 dlm_flags,
756 lockres->l_name,
f0681062 757 OCFS2_LOCK_ID_MAX_LEN - 1,
e92d57df 758 ocfs2_locking_ast,
ccd979bd 759 lockres,
aa2623ad 760 ocfs2_blocking_ast);
ccd979bd
MF		 761 if (status != DLM_NORMAL) {
762 ocfs2_log_dlm_error("dlmlock", status, lockres);
763 ret = -EINVAL;
764 ocfs2_recover_from_dlm_error(lockres, 1);
765 }
766
767 mlog(0, "lock %s, successfull return from dlmlock\n", lockres->l_name);
768
769bail:
770 mlog_exit(ret);
771 return ret;
772}
773
774static inline int ocfs2_check_wait_flag(struct ocfs2_lock_res *lockres,
775 int flag)
776{
777 unsigned long flags;
778 int ret;
779
780 spin_lock_irqsave(&lockres->l_lock, flags);
781 ret = lockres->l_flags & flag;
782 spin_unlock_irqrestore(&lockres->l_lock, flags);
783
784 return ret;
785}
786
787static inline void ocfs2_wait_on_busy_lock(struct ocfs2_lock_res *lockres)
788
789{
790 wait_event(lockres->l_event,
791 !ocfs2_check_wait_flag(lockres, OCFS2_LOCK_BUSY));
792}
793
794static inline void ocfs2_wait_on_refreshing_lock(struct ocfs2_lock_res *lockres)
795
796{
797 wait_event(lockres->l_event,
798 !ocfs2_check_wait_flag(lockres, OCFS2_LOCK_REFRESHING));
799}
800
801/* predict what lock level we'll be dropping down to on behalf
802 * of another node, and return true if the currently wanted
803 * level will be compatible with it. */
804static inline int ocfs2_may_continue_on_blocked_lock(struct ocfs2_lock_res *lockres,
805 int wanted)
806{
807 BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED));
808
809 return wanted <= ocfs2_highest_compat_lock_level(lockres->l_blocking);
810}
811
812static void ocfs2_init_mask_waiter(struct ocfs2_mask_waiter *mw)
813{
814 INIT_LIST_HEAD(&mw->mw_item);
815 init_completion(&mw->mw_complete);
816}
817
818static int ocfs2_wait_for_mask(struct ocfs2_mask_waiter *mw)
819{
820 wait_for_completion(&mw->mw_complete);
821 /* Re-arm the completion in case we want to wait on it again */
822 INIT_COMPLETION(mw->mw_complete);
823 return mw->mw_status;
824}
825
826static void lockres_add_mask_waiter(struct ocfs2_lock_res *lockres,
827 struct ocfs2_mask_waiter *mw,
828 unsigned long mask,
829 unsigned long goal)
830{
831 BUG_ON(!list_empty(&mw->mw_item));
832
833 assert_spin_locked(&lockres->l_lock);
834
835 list_add_tail(&mw->mw_item, &lockres->l_mask_waiters);
836 mw->mw_mask = mask;
837 mw->mw_goal = goal;
838}
839
840/* returns 0 if the mw that was removed was already satisfied, -EBUSY
841 * if the mask still hadn't reached its goal */
842static int lockres_remove_mask_waiter(struct ocfs2_lock_res *lockres,
843 struct ocfs2_mask_waiter *mw)
844{
845 unsigned long flags;
846 int ret = 0;
847
848 spin_lock_irqsave(&lockres->l_lock, flags);
849 if (!list_empty(&mw->mw_item)) {
850 if ((lockres->l_flags & mw->mw_mask) != mw->mw_goal)
851 ret = -EBUSY;
852
853 list_del_init(&mw->mw_item);
854 init_completion(&mw->mw_complete);
855 }
856 spin_unlock_irqrestore(&lockres->l_lock, flags);
857
858 return ret;
859
860}
861
862static int ocfs2_cluster_lock(struct ocfs2_super *osb,
863 struct ocfs2_lock_res *lockres,
864 int level,
865 int lkm_flags,
866 int arg_flags)
867{
868 struct ocfs2_mask_waiter mw;
869 enum dlm_status status;
870 int wait, catch_signals = !(osb->s_mount_opt & OCFS2_MOUNT_NOINTR);
871 int ret = 0; /* gcc doesn't realize wait = 1 guarantees ret is set */
872 unsigned long flags;
873
874 mlog_entry_void();
875
876 ocfs2_init_mask_waiter(&mw);
877
b80fc012
MF		 878 if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB)
879 lkm_flags |= LKM_VALBLK;
880
ccd979bd
MF		 881again:
882 wait = 0;
883
884 if (catch_signals && signal_pending(current)) {
885 ret = -ERESTARTSYS;
886 goto out;
887 }
888
889 spin_lock_irqsave(&lockres->l_lock, flags);
890
891 mlog_bug_on_msg(lockres->l_flags & OCFS2_LOCK_FREEING,
892 "Cluster lock called on freeing lockres %s! flags "
893 "0x%lx\n", lockres->l_name, lockres->l_flags);
894
895 /* We only compare against the currently granted level
896 * here. If the lock is blocked waiting on a downconvert,
897 * we'll get caught below. */
898 if (lockres->l_flags & OCFS2_LOCK_BUSY &&
899 level > lockres->l_level) {
900 /* is someone sitting in dlm_lock? If so, wait on
901 * them. */
902 lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0);
903 wait = 1;
904 goto unlock;
905 }
906
907 if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) {
908 /* lock has not been created yet. */
909 spin_unlock_irqrestore(&lockres->l_lock, flags);
910
911 ret = ocfs2_lock_create(osb, lockres, LKM_NLMODE, 0);
912 if (ret < 0) {
913 mlog_errno(ret);
914 goto out;
915 }
916 goto again;
917 }
918
919 if (lockres->l_flags & OCFS2_LOCK_BLOCKED &&
920 !ocfs2_may_continue_on_blocked_lock(lockres, level)) {
921 /* is the lock is currently blocked on behalf of
922 * another node */
923 lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BLOCKED, 0);
924 wait = 1;
925 goto unlock;
926 }
927
928 if (level > lockres->l_level) {
929 if (lockres->l_action != OCFS2_AST_INVALID)
930 mlog(ML_ERROR, "lockres %s has action %u pending\n",
931 lockres->l_name, lockres->l_action);
932
933 lockres->l_action = OCFS2_AST_CONVERT;
934 lockres->l_requested = level;
935 lockres_or_flags(lockres, OCFS2_LOCK_BUSY);
936 spin_unlock_irqrestore(&lockres->l_lock, flags);
937
938 BUG_ON(level == LKM_IVMODE);
939 BUG_ON(level == LKM_NLMODE);
940
941 mlog(0, "lock %s, convert from %d to level = %d\n",
942 lockres->l_name, lockres->l_level, level);
943
944 /* call dlm_lock to upgrade lock now */
945 status = dlmlock(osb->dlm,
946 level,
947 &lockres->l_lksb,
b80fc012 948 lkm_flags|LKM_CONVERT,
ccd979bd 949 lockres->l_name,
f0681062 950 OCFS2_LOCK_ID_MAX_LEN - 1,
e92d57df 951 ocfs2_locking_ast,
ccd979bd 952 lockres,
aa2623ad 953 ocfs2_blocking_ast);
ccd979bd
MF		 954 if (status != DLM_NORMAL) {
955 if ((lkm_flags & LKM_NOQUEUE) &&
956 (status == DLM_NOTQUEUED))
957 ret = -EAGAIN;
958 else {
959 ocfs2_log_dlm_error("dlmlock", status,
960 lockres);
961 ret = -EINVAL;
962 }
963 ocfs2_recover_from_dlm_error(lockres, 1);
964 goto out;
965 }
966
967 mlog(0, "lock %s, successfull return from dlmlock\n",
968 lockres->l_name);
969
970 /* At this point we've gone inside the dlm and need to
971 * complete our work regardless. */
972 catch_signals = 0;
973
974 /* wait for busy to clear and carry on */
975 goto again;
976 }
977
978 /* Ok, if we get here then we're good to go. */
979 ocfs2_inc_holders(lockres, level);
980
981 ret = 0;
982unlock:
983 spin_unlock_irqrestore(&lockres->l_lock, flags);
984out:
985 /*
986 * This is helping work around a lock inversion between the page lock
987 * and dlm locks. One path holds the page lock while calling aops
988 * which block acquiring dlm locks. The voting thread holds dlm
989 * locks while acquiring page locks while down converting data locks.
990 * This block is helping an aop path notice the inversion and back
991 * off to unlock its page lock before trying the dlm lock again.
992 */
993 if (wait && arg_flags & OCFS2_LOCK_NONBLOCK &&
994 mw.mw_mask & (OCFS2_LOCK_BUSY|OCFS2_LOCK_BLOCKED)) {
995 wait = 0;
996 if (lockres_remove_mask_waiter(lockres, &mw))
997 ret = -EAGAIN;
998 else
999 goto again;
1000 }
1001 if (wait) {
1002 ret = ocfs2_wait_for_mask(&mw);
1003 if (ret == 0)
1004 goto again;
1005 mlog_errno(ret);
1006 }
1007
1008 mlog_exit(ret);
1009 return ret;
1010}
1011
1012static void ocfs2_cluster_unlock(struct ocfs2_super *osb,
1013 struct ocfs2_lock_res *lockres,
1014 int level)
1015{
1016 unsigned long flags;
1017
1018 mlog_entry_void();
1019 spin_lock_irqsave(&lockres->l_lock, flags);
1020 ocfs2_dec_holders(lockres, level);
1021 ocfs2_vote_on_unlock(osb, lockres);
1022 spin_unlock_irqrestore(&lockres->l_lock, flags);
1023 mlog_exit_void();
1024}
1025
d680efe9
MF		 1026int ocfs2_create_new_lock(struct ocfs2_super *osb,
1027 struct ocfs2_lock_res *lockres,
24c19ef4
MF		 1028 int ex,
1029 int local)
ccd979bd 1030{
d680efe9 1031 int level = ex ? LKM_EXMODE : LKM_PRMODE;
ccd979bd 1032 unsigned long flags;
24c19ef4 1033 int lkm_flags = local ? LKM_LOCAL : 0;
ccd979bd
MF		 1034
1035 spin_lock_irqsave(&lockres->l_lock, flags);
1036 BUG_ON(lockres->l_flags & OCFS2_LOCK_ATTACHED);
1037 lockres_or_flags(lockres, OCFS2_LOCK_LOCAL);
1038 spin_unlock_irqrestore(&lockres->l_lock, flags);
1039
24c19ef4 1040 return ocfs2_lock_create(osb, lockres, level, lkm_flags);
ccd979bd
MF		 1041}
1042
1043/* Grants us an EX lock on the data and metadata resources, skipping
1044 * the normal cluster directory lookup. Use this ONLY on newly created
1045 * inodes which other nodes can't possibly see, and which haven't been
1046 * hashed in the inode hash yet. This can give us a good performance
1047 * increase as it'll skip the network broadcast normally associated
1048 * with creating a new lock resource. */
1049int ocfs2_create_new_inode_locks(struct inode *inode)
1050{
1051 int ret;
d680efe9 1052 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
ccd979bd
MF		 1053
1054 BUG_ON(!inode);
1055 BUG_ON(!ocfs2_inode_is_new(inode));
1056
1057 mlog_entry_void();
1058
b0697053 1059 mlog(0, "Inode %llu\n", (unsigned long long)OCFS2_I(inode)->ip_blkno);
ccd979bd
MF		 1060
1061 /* NOTE: That we don't increment any of the holder counts, nor
1062 * do we add anything to a journal handle. Since this is
1063 * supposed to be a new inode which the cluster doesn't know
1064 * about yet, there is no need to. As far as the LVB handling
1065 * is concerned, this is basically like acquiring an EX lock
1066 * on a resource which has an invalid one -- we'll set it
1067 * valid when we release the EX. */
1068
24c19ef4 1069 ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_rw_lockres, 1, 1);
ccd979bd
MF		 1070 if (ret) {
1071 mlog_errno(ret);
1072 goto bail;
1073 }
1074
24c19ef4
MF		 1075 /*
1076 * We don't want to use LKM_LOCAL on a meta data lock as they
1077 * don't use a generation in their lock names.
1078 */
1079 ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_meta_lockres, 1, 0);
ccd979bd
MF		 1080 if (ret) {
1081 mlog_errno(ret);
1082 goto bail;
1083 }
1084
24c19ef4 1085 ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_data_lockres, 1, 1);
ccd979bd
MF		 1086 if (ret) {
1087 mlog_errno(ret);
1088 goto bail;
1089 }
1090
1091bail:
1092 mlog_exit(ret);
1093 return ret;
1094}
1095
1096int ocfs2_rw_lock(struct inode *inode, int write)
1097{
1098 int status, level;
1099 struct ocfs2_lock_res *lockres;
1100
1101 BUG_ON(!inode);
1102
1103 mlog_entry_void();
1104
b0697053
MF		 1105 mlog(0, "inode %llu take %s RW lock\n",
1106 (unsigned long long)OCFS2_I(inode)->ip_blkno,
ccd979bd
MF		 1107 write ? "EXMODE" : "PRMODE");
1108
1109 lockres = &OCFS2_I(inode)->ip_rw_lockres;
1110
1111 level = write ? LKM_EXMODE : LKM_PRMODE;
1112
1113 status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres, level, 0,
1114 0);
1115 if (status < 0)
1116 mlog_errno(status);
1117
1118 mlog_exit(status);
1119 return status;
1120}
1121
1122void ocfs2_rw_unlock(struct inode *inode, int write)
1123{
1124 int level = write ? LKM_EXMODE : LKM_PRMODE;
1125 struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_rw_lockres;
1126
1127 mlog_entry_void();
1128
b0697053
MF		 1129 mlog(0, "inode %llu drop %s RW lock\n",
1130 (unsigned long long)OCFS2_I(inode)->ip_blkno,
ccd979bd
MF		 1131 write ? "EXMODE" : "PRMODE");
1132
1133 ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level);
1134
1135 mlog_exit_void();
1136}
1137
1138int ocfs2_data_lock_full(struct inode *inode,
1139 int write,
1140 int arg_flags)
1141{
1142 int status = 0, level;
1143 struct ocfs2_lock_res *lockres;
1144
1145 BUG_ON(!inode);
1146
1147 mlog_entry_void();
1148
b0697053
MF		 1149 mlog(0, "inode %llu take %s DATA lock\n",
1150 (unsigned long long)OCFS2_I(inode)->ip_blkno,
ccd979bd
MF		 1151 write ? "EXMODE" : "PRMODE");
1152
1153 /* We'll allow faking a readonly data lock for
1154 * rodevices. */
1155 if (ocfs2_is_hard_readonly(OCFS2_SB(inode->i_sb))) {
1156 if (write) {
1157 status = -EROFS;
1158 mlog_errno(status);
1159 }
1160 goto out;
1161 }
1162
1163 lockres = &OCFS2_I(inode)->ip_data_lockres;
1164
1165 level = write ? LKM_EXMODE : LKM_PRMODE;
1166
1167 status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres, level,
1168 0, arg_flags);
1169 if (status < 0 && status != -EAGAIN)
1170 mlog_errno(status);
1171
1172out:
1173 mlog_exit(status);
1174 return status;
1175}
1176
1177/* see ocfs2_meta_lock_with_page() */
1178int ocfs2_data_lock_with_page(struct inode *inode,
1179 int write,
1180 struct page *page)
1181{
1182 int ret;
1183
1184 ret = ocfs2_data_lock_full(inode, write, OCFS2_LOCK_NONBLOCK);
1185 if (ret == -EAGAIN) {
1186 unlock_page(page);
1187 if (ocfs2_data_lock(inode, write) == 0)
1188 ocfs2_data_unlock(inode, write);
1189 ret = AOP_TRUNCATED_PAGE;
1190 }
1191
1192 return ret;
1193}
1194
1195static void ocfs2_vote_on_unlock(struct ocfs2_super *osb,
1196 struct ocfs2_lock_res *lockres)
1197{
1198 int kick = 0;
1199
1200 mlog_entry_void();
1201
1202 /* If we know that another node is waiting on our lock, kick
1203 * the vote thread * pre-emptively when we reach a release
1204 * condition. */
1205 if (lockres->l_flags & OCFS2_LOCK_BLOCKED) {
1206 switch(lockres->l_blocking) {
1207 case LKM_EXMODE:
1208 if (!lockres->l_ex_holders && !lockres->l_ro_holders)
1209 kick = 1;
1210 break;
1211 case LKM_PRMODE:
1212 if (!lockres->l_ex_holders)
1213 kick = 1;
1214 break;
1215 default:
1216 BUG();
1217 }
1218 }
1219
1220 if (kick)
1221 ocfs2_kick_vote_thread(osb);
1222
1223 mlog_exit_void();
1224}
1225
1226void ocfs2_data_unlock(struct inode *inode,
1227 int write)
1228{
1229 int level = write ? LKM_EXMODE : LKM_PRMODE;
1230 struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_data_lockres;
1231
1232 mlog_entry_void();
1233
b0697053
MF		 1234 mlog(0, "inode %llu drop %s DATA lock\n",
1235 (unsigned long long)OCFS2_I(inode)->ip_blkno,
ccd979bd
MF		 1236 write ? "EXMODE" : "PRMODE");
1237
1238 if (!ocfs2_is_hard_readonly(OCFS2_SB(inode->i_sb)))
1239 ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level);
1240
1241 mlog_exit_void();
1242}
1243
1244#define OCFS2_SEC_BITS 34
1245#define OCFS2_SEC_SHIFT (64 - 34)
1246#define OCFS2_NSEC_MASK ((1ULL << OCFS2_SEC_SHIFT) - 1)
1247
1248/* LVB only has room for 64 bits of time here so we pack it for
1249 * now. */
1250static u64 ocfs2_pack_timespec(struct timespec *spec)
1251{
1252 u64 res;
1253 u64 sec = spec->tv_sec;
1254 u32 nsec = spec->tv_nsec;
1255
1256 res = (sec << OCFS2_SEC_SHIFT) | (nsec & OCFS2_NSEC_MASK);
1257
1258 return res;
1259}
1260
1261/* Call this with the lockres locked. I am reasonably sure we don't
1262 * need ip_lock in this function as anyone who would be changing those
1263 * values is supposed to be blocked in ocfs2_meta_lock right now. */
1264static void __ocfs2_stuff_meta_lvb(struct inode *inode)
1265{
1266 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1267 struct ocfs2_lock_res *lockres = &oi->ip_meta_lockres;
1268 struct ocfs2_meta_lvb *lvb;
1269
1270 mlog_entry_void();
1271
1272 lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb;
1273
24c19ef4
MF		 1274 /*
1275 * Invalidate the LVB of a deleted inode - this way other
1276 * nodes are forced to go to disk and discover the new inode
1277 * status.
1278 */
1279 if (oi->ip_flags & OCFS2_INODE_DELETED) {
1280 lvb->lvb_version = 0;
1281 goto out;
1282 }
1283
4d3b83f7 1284 lvb->lvb_version = OCFS2_LVB_VERSION;
ccd979bd
MF		 1285 lvb->lvb_isize = cpu_to_be64(i_size_read(inode));
1286 lvb->lvb_iclusters = cpu_to_be32(oi->ip_clusters);
1287 lvb->lvb_iuid = cpu_to_be32(inode->i_uid);
1288 lvb->lvb_igid = cpu_to_be32(inode->i_gid);
1289 lvb->lvb_imode = cpu_to_be16(inode->i_mode);
1290 lvb->lvb_inlink = cpu_to_be16(inode->i_nlink);
1291 lvb->lvb_iatime_packed =
1292 cpu_to_be64(ocfs2_pack_timespec(&inode->i_atime));
1293 lvb->lvb_ictime_packed =
1294 cpu_to_be64(ocfs2_pack_timespec(&inode->i_ctime));
1295 lvb->lvb_imtime_packed =
1296 cpu_to_be64(ocfs2_pack_timespec(&inode->i_mtime));
ca4d147e 1297 lvb->lvb_iattr = cpu_to_be32(oi->ip_attr);
f9e2d82e 1298 lvb->lvb_igeneration = cpu_to_be32(inode->i_generation);
ccd979bd 1299
24c19ef4 1300out:
ccd979bd
MF		 1301 mlog_meta_lvb(0, lockres);
1302
1303 mlog_exit_void();
1304}
1305
1306static void ocfs2_unpack_timespec(struct timespec *spec,
1307 u64 packed_time)
1308{
1309 spec->tv_sec = packed_time >> OCFS2_SEC_SHIFT;
1310 spec->tv_nsec = packed_time & OCFS2_NSEC_MASK;
1311}
1312
1313static void ocfs2_refresh_inode_from_lvb(struct inode *inode)
1314{
1315 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1316 struct ocfs2_lock_res *lockres = &oi->ip_meta_lockres;
1317 struct ocfs2_meta_lvb *lvb;
1318
1319 mlog_entry_void();
1320
1321 mlog_meta_lvb(0, lockres);
1322
1323 lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb;
1324
1325 /* We're safe here without the lockres lock... */
1326 spin_lock(&oi->ip_lock);
1327 oi->ip_clusters = be32_to_cpu(lvb->lvb_iclusters);
1328 i_size_write(inode, be64_to_cpu(lvb->lvb_isize));
1329
ca4d147e
HP		 1330 oi->ip_attr = be32_to_cpu(lvb->lvb_iattr);
1331 ocfs2_set_inode_flags(inode);
1332
ccd979bd
MF		 1333 /* fast-symlinks are a special case */
1334 if (S_ISLNK(inode->i_mode) && !oi->ip_clusters)
1335 inode->i_blocks = 0;
1336 else
1337 inode->i_blocks =
1338 ocfs2_align_bytes_to_sectors(i_size_read(inode));
1339
1340 inode->i_uid = be32_to_cpu(lvb->lvb_iuid);
1341 inode->i_gid = be32_to_cpu(lvb->lvb_igid);
1342 inode->i_mode = be16_to_cpu(lvb->lvb_imode);
1343 inode->i_nlink = be16_to_cpu(lvb->lvb_inlink);
1344 ocfs2_unpack_timespec(&inode->i_atime,
1345 be64_to_cpu(lvb->lvb_iatime_packed));
1346 ocfs2_unpack_timespec(&inode->i_mtime,
1347 be64_to_cpu(lvb->lvb_imtime_packed));
1348 ocfs2_unpack_timespec(&inode->i_ctime,
1349 be64_to_cpu(lvb->lvb_ictime_packed));
1350 spin_unlock(&oi->ip_lock);
1351
1352 mlog_exit_void();
1353}
1354
f9e2d82e
MF		 1355static inline int ocfs2_meta_lvb_is_trustable(struct inode *inode,
1356 struct ocfs2_lock_res *lockres)
ccd979bd
MF		 1357{
1358 struct ocfs2_meta_lvb *lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb;
1359
f9e2d82e
MF		 1360 if (lvb->lvb_version == OCFS2_LVB_VERSION
1361 && be32_to_cpu(lvb->lvb_igeneration) == inode->i_generation)
ccd979bd
MF		 1362 return 1;
1363 return 0;
1364}
1365
1366/* Determine whether a lock resource needs to be refreshed, and
1367 * arbitrate who gets to refresh it.
1368 *
1369 * 0 means no refresh needed.
1370 *
1371 * > 0 means you need to refresh this and you MUST call
1372 * ocfs2_complete_lock_res_refresh afterwards. */
1373static int ocfs2_should_refresh_lock_res(struct ocfs2_lock_res *lockres)
1374{
1375 unsigned long flags;
1376 int status = 0;
1377
1378 mlog_entry_void();
1379
1380refresh_check:
1381 spin_lock_irqsave(&lockres->l_lock, flags);
1382 if (!(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) {
1383 spin_unlock_irqrestore(&lockres->l_lock, flags);
1384 goto bail;
1385 }
1386
1387 if (lockres->l_flags & OCFS2_LOCK_REFRESHING) {
1388 spin_unlock_irqrestore(&lockres->l_lock, flags);
1389
1390 ocfs2_wait_on_refreshing_lock(lockres);
1391 goto refresh_check;
1392 }
1393
1394 /* Ok, I'll be the one to refresh this lock. */
1395 lockres_or_flags(lockres, OCFS2_LOCK_REFRESHING);
1396 spin_unlock_irqrestore(&lockres->l_lock, flags);
1397
1398 status = 1;
1399bail:
1400 mlog_exit(status);
1401 return status;
1402}
1403
1404/* If status is non zero, I'll mark it as not being in refresh
1405 * anymroe, but i won't clear the needs refresh flag. */
1406static inline void ocfs2_complete_lock_res_refresh(struct ocfs2_lock_res *lockres,
1407 int status)
1408{
1409 unsigned long flags;
1410 mlog_entry_void();
1411
1412 spin_lock_irqsave(&lockres->l_lock, flags);
1413 lockres_clear_flags(lockres, OCFS2_LOCK_REFRESHING);
1414 if (!status)
1415 lockres_clear_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH);
1416 spin_unlock_irqrestore(&lockres->l_lock, flags);
1417
1418 wake_up(&lockres->l_event);
1419
1420 mlog_exit_void();
1421}
1422
1423/* may or may not return a bh if it went to disk. */
1424static int ocfs2_meta_lock_update(struct inode *inode,
1425 struct buffer_head **bh)
1426{
1427 int status = 0;
1428 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1429 struct ocfs2_lock_res *lockres;
1430 struct ocfs2_dinode *fe;
1431
1432 mlog_entry_void();
1433
1434 spin_lock(&oi->ip_lock);
1435 if (oi->ip_flags & OCFS2_INODE_DELETED) {
b0697053 1436 mlog(0, "Orphaned inode %llu was deleted while we "
ccd979bd 1437 "were waiting on a lock. ip_flags = 0x%x\n",
b0697053 1438 (unsigned long long)oi->ip_blkno, oi->ip_flags);
ccd979bd
MF		 1439 spin_unlock(&oi->ip_lock);
1440 status = -ENOENT;
1441 goto bail;
1442 }
1443 spin_unlock(&oi->ip_lock);
1444
1445 lockres = &oi->ip_meta_lockres;
1446
1447 if (!ocfs2_should_refresh_lock_res(lockres))
1448 goto bail;
1449
1450 /* This will discard any caching information we might have had
1451 * for the inode metadata. */
1452 ocfs2_metadata_cache_purge(inode);
1453
1454 /* will do nothing for inode types that don't use the extent
1455 * map (directories, bitmap files, etc) */
1456 ocfs2_extent_map_trunc(inode, 0);
1457
f9e2d82e 1458 if (ocfs2_meta_lvb_is_trustable(inode, lockres)) {
b0697053
MF		 1459 mlog(0, "Trusting LVB on inode %llu\n",
1460 (unsigned long long)oi->ip_blkno);
ccd979bd
MF		 1461 ocfs2_refresh_inode_from_lvb(inode);
1462 } else {
1463 /* Boo, we have to go to disk. */
1464 /* read bh, cast, ocfs2_refresh_inode */
1465 status = ocfs2_read_block(OCFS2_SB(inode->i_sb), oi->ip_blkno,
1466 bh, OCFS2_BH_CACHED, inode);
1467 if (status < 0) {
1468 mlog_errno(status);
1469 goto bail_refresh;
1470 }
1471 fe = (struct ocfs2_dinode *) (*bh)->b_data;
1472
1473 /* This is a good chance to make sure we're not
1474 * locking an invalid object.
1475 *
1476 * We bug on a stale inode here because we checked
1477 * above whether it was wiped from disk. The wiping
1478 * node provides a guarantee that we receive that
1479 * message and can mark the inode before dropping any
1480 * locks associated with it. */
1481 if (!OCFS2_IS_VALID_DINODE(fe)) {
1482 OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe);
1483 status = -EIO;
1484 goto bail_refresh;
1485 }
1486 mlog_bug_on_msg(inode->i_generation !=
1487 le32_to_cpu(fe->i_generation),
b0697053 1488 "Invalid dinode %llu disk generation: %u "
ccd979bd 1489 "inode->i_generation: %u\n",
b0697053
MF		 1490 (unsigned long long)oi->ip_blkno,
1491 le32_to_cpu(fe->i_generation),
ccd979bd
MF		 1492 inode->i_generation);
1493 mlog_bug_on_msg(le64_to_cpu(fe->i_dtime) ||
1494 !(fe->i_flags & cpu_to_le32(OCFS2_VALID_FL)),
b0697053
MF		 1495 "Stale dinode %llu dtime: %llu flags: 0x%x\n",
1496 (unsigned long long)oi->ip_blkno,
1497 (unsigned long long)le64_to_cpu(fe->i_dtime),
ccd979bd
MF		 1498 le32_to_cpu(fe->i_flags));
1499
1500 ocfs2_refresh_inode(inode, fe);
1501 }
1502
1503 status = 0;
1504bail_refresh:
1505 ocfs2_complete_lock_res_refresh(lockres, status);
1506bail:
1507 mlog_exit(status);
1508 return status;
1509}
1510
1511static int ocfs2_assign_bh(struct inode *inode,
1512 struct buffer_head **ret_bh,
1513 struct buffer_head *passed_bh)
1514{
1515 int status;
1516
1517 if (passed_bh) {
1518 /* Ok, the update went to disk for us, use the
1519 * returned bh. */
1520 *ret_bh = passed_bh;
1521 get_bh(*ret_bh);
1522
1523 return 0;
1524 }
1525
1526 status = ocfs2_read_block(OCFS2_SB(inode->i_sb),
1527 OCFS2_I(inode)->ip_blkno,
1528 ret_bh,
1529 OCFS2_BH_CACHED,
1530 inode);
1531 if (status < 0)
1532 mlog_errno(status);
1533
1534 return status;
1535}
1536
1537/*
1538 * returns < 0 error if the callback will never be called, otherwise
1539 * the result of the lock will be communicated via the callback.
1540 */
1541int ocfs2_meta_lock_full(struct inode *inode,
1542 struct ocfs2_journal_handle *handle,
1543 struct buffer_head **ret_bh,
1544 int ex,
1545 int arg_flags)
1546{
1547 int status, level, dlm_flags, acquired;
1548 struct ocfs2_lock_res *lockres;
1549 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1550 struct buffer_head *local_bh = NULL;
1551
1552 BUG_ON(!inode);
1553
1554 mlog_entry_void();
1555
b0697053
MF		 1556 mlog(0, "inode %llu, take %s META lock\n",
1557 (unsigned long long)OCFS2_I(inode)->ip_blkno,
ccd979bd
MF		 1558 ex ? "EXMODE" : "PRMODE");
1559
1560 status = 0;
1561 acquired = 0;
1562 /* We'll allow faking a readonly metadata lock for
1563 * rodevices. */
1564 if (ocfs2_is_hard_readonly(osb)) {
1565 if (ex)
1566 status = -EROFS;
1567 goto bail;
1568 }
1569
1570 if (!(arg_flags & OCFS2_META_LOCK_RECOVERY))
1571 wait_event(osb->recovery_event,
1572 ocfs2_node_map_is_empty(osb, &osb->recovery_map));
1573
1574 acquired = 0;
1575 lockres = &OCFS2_I(inode)->ip_meta_lockres;
1576 level = ex ? LKM_EXMODE : LKM_PRMODE;
1577 dlm_flags = 0;
1578 if (arg_flags & OCFS2_META_LOCK_NOQUEUE)
1579 dlm_flags |= LKM_NOQUEUE;
1580
1581 status = ocfs2_cluster_lock(osb, lockres, level, dlm_flags, arg_flags);
1582 if (status < 0) {
1583 if (status != -EAGAIN && status != -EIOCBRETRY)
1584 mlog_errno(status);
1585 goto bail;
1586 }
1587
1588 /* Notify the error cleanup path to drop the cluster lock. */
1589 acquired = 1;
1590
1591 /* We wait twice because a node may have died while we were in
1592 * the lower dlm layers. The second time though, we've
1593 * committed to owning this lock so we don't allow signals to
1594 * abort the operation. */
1595 if (!(arg_flags & OCFS2_META_LOCK_RECOVERY))
1596 wait_event(osb->recovery_event,
1597 ocfs2_node_map_is_empty(osb, &osb->recovery_map));
1598
24c19ef4
MF		 1599 /*
1600 * We only see this flag if we're being called from
1601 * ocfs2_read_locked_inode(). It means we're locking an inode
1602 * which hasn't been populated yet, so clear the refresh flag
1603 * and let the caller handle it.
1604 */
1605 if (inode->i_state & I_NEW) {
1606 status = 0;
1607 ocfs2_complete_lock_res_refresh(lockres, 0);
1608 goto bail;
1609 }
1610
ccd979bd
MF		 1611 /* This is fun. The caller may want a bh back, or it may
1612 * not. ocfs2_meta_lock_update definitely wants one in, but
1613 * may or may not read one, depending on what's in the
1614 * LVB. The result of all of this is that we've *only* gone to
1615 * disk if we have to, so the complexity is worthwhile. */
1616 status = ocfs2_meta_lock_update(inode, &local_bh);
1617 if (status < 0) {
1618 if (status != -ENOENT)
1619 mlog_errno(status);
1620 goto bail;
1621 }
1622
1623 if (ret_bh) {
1624 status = ocfs2_assign_bh(inode, ret_bh, local_bh);
1625 if (status < 0) {
1626 mlog_errno(status);
1627 goto bail;
1628 }
1629 }
1630
1631 if (handle) {
1632 status = ocfs2_handle_add_lock(handle, inode);
1633 if (status < 0)
1634 mlog_errno(status);
1635 }
1636
1637bail:
1638 if (status < 0) {
1639 if (ret_bh && (*ret_bh)) {
1640 brelse(*ret_bh);
1641 *ret_bh = NULL;
1642 }
1643 if (acquired)
1644 ocfs2_meta_unlock(inode, ex);
1645 }
1646
1647 if (local_bh)
1648 brelse(local_bh);
1649
1650 mlog_exit(status);
1651 return status;
1652}
1653
1654/*
1655 * This is working around a lock inversion between tasks acquiring DLM locks
1656 * while holding a page lock and the vote thread which blocks dlm lock acquiry
1657 * while acquiring page locks.
1658 *
1659 * ** These _with_page variantes are only intended to be called from aop
1660 * methods that hold page locks and return a very specific *positive* error
1661 * code that aop methods pass up to the VFS -- test for errors with != 0. **
1662 *
1663 * The DLM is called such that it returns -EAGAIN if it would have blocked
1664 * waiting for the vote thread. In that case we unlock our page so the vote
1665 * thread can make progress. Once we've done this we have to return
1666 * AOP_TRUNCATED_PAGE so the aop method that called us can bubble that back up
1667 * into the VFS who will then immediately retry the aop call.
1668 *
1669 * We do a blocking lock and immediate unlock before returning, though, so that
1670 * the lock has a great chance of being cached on this node by the time the VFS
1671 * calls back to retry the aop. This has a potential to livelock as nodes
1672 * ping locks back and forth, but that's a risk we're willing to take to avoid
1673 * the lock inversion simply.
1674 */
1675int ocfs2_meta_lock_with_page(struct inode *inode,
1676 struct ocfs2_journal_handle *handle,
1677 struct buffer_head **ret_bh,
1678 int ex,
1679 struct page *page)
1680{
1681 int ret;
1682
1683 ret = ocfs2_meta_lock_full(inode, handle, ret_bh, ex,
1684 OCFS2_LOCK_NONBLOCK);
1685 if (ret == -EAGAIN) {
1686 unlock_page(page);
1687 if (ocfs2_meta_lock(inode, handle, ret_bh, ex) == 0)
1688 ocfs2_meta_unlock(inode, ex);
1689 ret = AOP_TRUNCATED_PAGE;
1690 }
1691
1692 return ret;
1693}
1694
1695void ocfs2_meta_unlock(struct inode *inode,
1696 int ex)
1697{
1698 int level = ex ? LKM_EXMODE : LKM_PRMODE;
1699 struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_meta_lockres;
1700
1701 mlog_entry_void();
1702
b0697053
MF		 1703 mlog(0, "inode %llu drop %s META lock\n",
1704 (unsigned long long)OCFS2_I(inode)->ip_blkno,
ccd979bd
MF		 1705 ex ? "EXMODE" : "PRMODE");
1706
1707 if (!ocfs2_is_hard_readonly(OCFS2_SB(inode->i_sb)))
1708 ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level);
1709
1710 mlog_exit_void();
1711}
1712
1713int ocfs2_super_lock(struct ocfs2_super *osb,
1714 int ex)
1715{
1716 int status;
1717 int level = ex ? LKM_EXMODE : LKM_PRMODE;
1718 struct ocfs2_lock_res *lockres = &osb->osb_super_lockres;
1719 struct buffer_head *bh;
1720 struct ocfs2_slot_info *si = osb->slot_info;
1721
1722 mlog_entry_void();
1723
1724 if (ocfs2_is_hard_readonly(osb))
1725 return -EROFS;
1726
1727 status = ocfs2_cluster_lock(osb, lockres, level, 0, 0);
1728 if (status < 0) {
1729 mlog_errno(status);
1730 goto bail;
1731 }
1732
1733 /* The super block lock path is really in the best position to
1734 * know when resources covered by the lock need to be
1735 * refreshed, so we do it here. Of course, making sense of
1736 * everything is up to the caller :) */
1737 status = ocfs2_should_refresh_lock_res(lockres);
1738 if (status < 0) {
1739 mlog_errno(status);
1740 goto bail;
1741 }
1742 if (status) {
1743 bh = si->si_bh;
1744 status = ocfs2_read_block(osb, bh->b_blocknr, &bh, 0,
1745 si->si_inode);
1746 if (status == 0)
1747 ocfs2_update_slot_info(si);
1748
1749 ocfs2_complete_lock_res_refresh(lockres, status);
1750
1751 if (status < 0)
1752 mlog_errno(status);
1753 }
1754bail:
1755 mlog_exit(status);
1756 return status;
1757}
1758
1759void ocfs2_super_unlock(struct ocfs2_super *osb,
1760 int ex)
1761{
1762 int level = ex ? LKM_EXMODE : LKM_PRMODE;
1763 struct ocfs2_lock_res *lockres = &osb->osb_super_lockres;
1764
1765 ocfs2_cluster_unlock(osb, lockres, level);
1766}
1767
1768int ocfs2_rename_lock(struct ocfs2_super *osb)
1769{
1770 int status;
1771 struct ocfs2_lock_res *lockres = &osb->osb_rename_lockres;
1772
1773 if (ocfs2_is_hard_readonly(osb))
1774 return -EROFS;
1775
1776 status = ocfs2_cluster_lock(osb, lockres, LKM_EXMODE, 0, 0);
1777 if (status < 0)
1778 mlog_errno(status);
1779
1780 return status;
1781}
1782
1783void ocfs2_rename_unlock(struct ocfs2_super *osb)
1784{
1785 struct ocfs2_lock_res *lockres = &osb->osb_rename_lockres;
1786
1787 ocfs2_cluster_unlock(osb, lockres, LKM_EXMODE);
1788}
1789
d680efe9
MF		 1790int ocfs2_dentry_lock(struct dentry *dentry, int ex)
1791{
1792 int ret;
1793 int level = ex ? LKM_EXMODE : LKM_PRMODE;
1794 struct ocfs2_dentry_lock *dl = dentry->d_fsdata;
1795 struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
1796
1797 BUG_ON(!dl);
1798
1799 if (ocfs2_is_hard_readonly(osb))
1800 return -EROFS;
1801
1802 ret = ocfs2_cluster_lock(osb, &dl->dl_lockres, level, 0, 0);
1803 if (ret < 0)
1804 mlog_errno(ret);
1805
1806 return ret;
1807}
1808
1809void ocfs2_dentry_unlock(struct dentry *dentry, int ex)
1810{
1811 int level = ex ? LKM_EXMODE : LKM_PRMODE;
1812 struct ocfs2_dentry_lock *dl = dentry->d_fsdata;
1813 struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
1814
1815 ocfs2_cluster_unlock(osb, &dl->dl_lockres, level);
1816}
1817
ccd979bd
MF		 1818/* Reference counting of the dlm debug structure. We want this because
1819 * open references on the debug inodes can live on after a mount, so
1820 * we can't rely on the ocfs2_super to always exist. */
1821static void ocfs2_dlm_debug_free(struct kref *kref)
1822{
1823 struct ocfs2_dlm_debug *dlm_debug;
1824
1825 dlm_debug = container_of(kref, struct ocfs2_dlm_debug, d_refcnt);
1826
1827 kfree(dlm_debug);
1828}
1829
1830void ocfs2_put_dlm_debug(struct ocfs2_dlm_debug *dlm_debug)
1831{
1832 if (dlm_debug)
1833 kref_put(&dlm_debug->d_refcnt, ocfs2_dlm_debug_free);
1834}
1835
1836static void ocfs2_get_dlm_debug(struct ocfs2_dlm_debug *debug)
1837{
1838 kref_get(&debug->d_refcnt);
1839}
1840
1841struct ocfs2_dlm_debug *ocfs2_new_dlm_debug(void)
1842{
1843 struct ocfs2_dlm_debug *dlm_debug;
1844
1845 dlm_debug = kmalloc(sizeof(struct ocfs2_dlm_debug), GFP_KERNEL);
1846 if (!dlm_debug) {
1847 mlog_errno(-ENOMEM);
1848 goto out;
1849 }
1850
1851 kref_init(&dlm_debug->d_refcnt);
1852 INIT_LIST_HEAD(&dlm_debug->d_lockres_tracking);
1853 dlm_debug->d_locking_state = NULL;
1854out:
1855 return dlm_debug;
1856}
1857
1858/* Access to this is arbitrated for us via seq_file->sem. */
1859struct ocfs2_dlm_seq_priv {
1860 struct ocfs2_dlm_debug *p_dlm_debug;
1861 struct ocfs2_lock_res p_iter_res;
1862 struct ocfs2_lock_res p_tmp_res;
1863};
1864
1865static struct ocfs2_lock_res *ocfs2_dlm_next_res(struct ocfs2_lock_res *start,
1866 struct ocfs2_dlm_seq_priv *priv)
1867{
1868 struct ocfs2_lock_res *iter, *ret = NULL;
1869 struct ocfs2_dlm_debug *dlm_debug = priv->p_dlm_debug;
1870
1871 assert_spin_locked(&ocfs2_dlm_tracking_lock);
1872
1873 list_for_each_entry(iter, &start->l_debug_list, l_debug_list) {
1874 /* discover the head of the list */
1875 if (&iter->l_debug_list == &dlm_debug->d_lockres_tracking) {
1876 mlog(0, "End of list found, %p\n", ret);
1877 break;
1878 }
1879
1880 /* We track our "dummy" iteration lockres' by a NULL
1881 * l_ops field. */
1882 if (iter->l_ops != NULL) {
1883 ret = iter;
1884 break;
1885 }
1886 }
1887
1888 return ret;
1889}
1890
1891static void *ocfs2_dlm_seq_start(struct seq_file *m, loff_t *pos)
1892{
1893 struct ocfs2_dlm_seq_priv *priv = m->private;
1894 struct ocfs2_lock_res *iter;
1895
1896 spin_lock(&ocfs2_dlm_tracking_lock);
1897 iter = ocfs2_dlm_next_res(&priv->p_iter_res, priv);
1898 if (iter) {
1899 /* Since lockres' have the lifetime of their container
1900 * (which can be inodes, ocfs2_supers, etc) we want to
1901 * copy this out to a temporary lockres while still
1902 * under the spinlock. Obviously after this we can't
1903 * trust any pointers on the copy returned, but that's
1904 * ok as the information we want isn't typically held
1905 * in them. */
1906 priv->p_tmp_res = *iter;
1907 iter = &priv->p_tmp_res;
1908 }
1909 spin_unlock(&ocfs2_dlm_tracking_lock);
1910
1911 return iter;
1912}
1913
1914static void ocfs2_dlm_seq_stop(struct seq_file *m, void *v)
1915{
1916}
1917
1918static void *ocfs2_dlm_seq_next(struct seq_file *m, void *v, loff_t *pos)
1919{
1920 struct ocfs2_dlm_seq_priv *priv = m->private;
1921 struct ocfs2_lock_res *iter = v;
1922 struct ocfs2_lock_res *dummy = &priv->p_iter_res;
1923
1924 spin_lock(&ocfs2_dlm_tracking_lock);
1925 iter = ocfs2_dlm_next_res(iter, priv);
1926 list_del_init(&dummy->l_debug_list);
1927 if (iter) {
1928 list_add(&dummy->l_debug_list, &iter->l_debug_list);
1929 priv->p_tmp_res = *iter;
1930 iter = &priv->p_tmp_res;
1931 }
1932 spin_unlock(&ocfs2_dlm_tracking_lock);
1933
1934 return iter;
1935}
1936
1937/* So that debugfs.ocfs2 can determine which format is being used */
1938#define OCFS2_DLM_DEBUG_STR_VERSION 1
1939static int ocfs2_dlm_seq_show(struct seq_file *m, void *v)
1940{
1941 int i;
1942 char *lvb;
1943 struct ocfs2_lock_res *lockres = v;
1944
1945 if (!lockres)
1946 return -EINVAL;
1947
d680efe9
MF		 1948 seq_printf(m, "0x%x\t", OCFS2_DLM_DEBUG_STR_VERSION);
1949
1950 if (lockres->l_type == OCFS2_LOCK_TYPE_DENTRY)
1951 seq_printf(m, "%.*s%08x\t", OCFS2_DENTRY_LOCK_INO_START - 1,
1952 lockres->l_name,
1953 (unsigned int)ocfs2_get_dentry_lock_ino(lockres));
1954 else
1955 seq_printf(m, "%.*s\t", OCFS2_LOCK_ID_MAX_LEN, lockres->l_name);
1956
1957 seq_printf(m, "%d\t"
ccd979bd
MF		 1958 "0x%lx\t"
1959 "0x%x\t"
1960 "0x%x\t"
1961 "%u\t"
1962 "%u\t"
1963 "%d\t"
1964 "%d\t",
ccd979bd
MF		 1965 lockres->l_level,
1966 lockres->l_flags,
1967 lockres->l_action,
1968 lockres->l_unlock_action,
1969 lockres->l_ro_holders,
1970 lockres->l_ex_holders,
1971 lockres->l_requested,
1972 lockres->l_blocking);
1973
1974 /* Dump the raw LVB */
1975 lvb = lockres->l_lksb.lvb;
1976 for(i = 0; i < DLM_LVB_LEN; i++)
1977 seq_printf(m, "0x%x\t", lvb[i]);
1978
1979 /* End the line */
1980 seq_printf(m, "\n");
1981 return 0;
1982}
1983
1984static struct seq_operations ocfs2_dlm_seq_ops = {
1985 .start = ocfs2_dlm_seq_start,
1986 .stop = ocfs2_dlm_seq_stop,
1987 .next = ocfs2_dlm_seq_next,
1988 .show = ocfs2_dlm_seq_show,
1989};
1990
1991static int ocfs2_dlm_debug_release(struct inode *inode, struct file *file)
1992{
1993 struct seq_file *seq = (struct seq_file *) file->private_data;
1994 struct ocfs2_dlm_seq_priv *priv = seq->private;
1995 struct ocfs2_lock_res *res = &priv->p_iter_res;
1996
1997 ocfs2_remove_lockres_tracking(res);
1998 ocfs2_put_dlm_debug(priv->p_dlm_debug);
1999 return seq_release_private(inode, file);
2000}
2001
2002static int ocfs2_dlm_debug_open(struct inode *inode, struct file *file)
2003{
2004 int ret;
2005 struct ocfs2_dlm_seq_priv *priv;
2006 struct seq_file *seq;
2007 struct ocfs2_super *osb;
2008
2009 priv = kzalloc(sizeof(struct ocfs2_dlm_seq_priv), GFP_KERNEL);
2010 if (!priv) {
2011 ret = -ENOMEM;
2012 mlog_errno(ret);
2013 goto out;
2014 }
2015 osb = (struct ocfs2_super *) inode->u.generic_ip;
2016 ocfs2_get_dlm_debug(osb->osb_dlm_debug);
2017 priv->p_dlm_debug = osb->osb_dlm_debug;
2018 INIT_LIST_HEAD(&priv->p_iter_res.l_debug_list);
2019
2020 ret = seq_open(file, &ocfs2_dlm_seq_ops);
2021 if (ret) {
2022 kfree(priv);
2023 mlog_errno(ret);
2024 goto out;
2025 }
2026
2027 seq = (struct seq_file *) file->private_data;
2028 seq->private = priv;
2029
2030 ocfs2_add_lockres_tracking(&priv->p_iter_res,
2031 priv->p_dlm_debug);
2032
2033out:
2034 return ret;
2035}
2036
4b6f5d20 2037static const struct file_operations ocfs2_dlm_debug_fops = {
ccd979bd
MF		 2038 .open = ocfs2_dlm_debug_open,
2039 .release = ocfs2_dlm_debug_release,
2040 .read = seq_read,
2041 .llseek = seq_lseek,
2042};
2043
2044static int ocfs2_dlm_init_debug(struct ocfs2_super *osb)
2045{
2046 int ret = 0;
2047 struct ocfs2_dlm_debug *dlm_debug = osb->osb_dlm_debug;
2048
2049 dlm_debug->d_locking_state = debugfs_create_file("locking_state",
2050 S_IFREG|S_IRUSR,
2051 osb->osb_debug_root,
2052 osb,
2053 &ocfs2_dlm_debug_fops);
2054 if (!dlm_debug->d_locking_state) {
2055 ret = -EINVAL;
2056 mlog(ML_ERROR,
2057 "Unable to create locking state debugfs file.\n");
2058 goto out;
2059 }
2060
2061 ocfs2_get_dlm_debug(dlm_debug);
2062out:
2063 return ret;
2064}
2065
2066static void ocfs2_dlm_shutdown_debug(struct ocfs2_super *osb)
2067{
2068 struct ocfs2_dlm_debug *dlm_debug = osb->osb_dlm_debug;
2069
2070 if (dlm_debug) {
2071 debugfs_remove(dlm_debug->d_locking_state);
2072 ocfs2_put_dlm_debug(dlm_debug);
2073 }
2074}
2075
2076int ocfs2_dlm_init(struct ocfs2_super *osb)
2077{
2078 int status;
2079 u32 dlm_key;
2080 struct dlm_ctxt *dlm;
2081
2082 mlog_entry_void();
2083
2084 status = ocfs2_dlm_init_debug(osb);
2085 if (status < 0) {
2086 mlog_errno(status);
2087 goto bail;
2088 }
2089
2090 /* launch vote thread */
78427043 2091 osb->vote_task = kthread_run(ocfs2_vote_thread, osb, "ocfs2vote");
ccd979bd
MF		 2092 if (IS_ERR(osb->vote_task)) {
2093 status = PTR_ERR(osb->vote_task);
2094 osb->vote_task = NULL;
2095 mlog_errno(status);
2096 goto bail;
2097 }
2098
2099 /* used by the dlm code to make message headers unique, each
2100 * node in this domain must agree on this. */
2101 dlm_key = crc32_le(0, osb->uuid_str, strlen(osb->uuid_str));
2102
2103 /* for now, uuid == domain */
2104 dlm = dlm_register_domain(osb->uuid_str, dlm_key);
2105 if (IS_ERR(dlm)) {
2106 status = PTR_ERR(dlm);
2107 mlog_errno(status);
2108 goto bail;
2109 }
2110
2111 ocfs2_super_lock_res_init(&osb->osb_super_lockres, osb);
2112 ocfs2_rename_lock_res_init(&osb->osb_rename_lockres, osb);
2113
2114 dlm_register_eviction_cb(dlm, &osb->osb_eviction_cb);
2115
2116 osb->dlm = dlm;
2117
2118 status = 0;
2119bail:
2120 if (status < 0) {
2121 ocfs2_dlm_shutdown_debug(osb);
2122 if (osb->vote_task)
2123 kthread_stop(osb->vote_task);
2124 }
2125
2126 mlog_exit(status);
2127 return status;
2128}
2129
2130void ocfs2_dlm_shutdown(struct ocfs2_super *osb)
2131{
2132 mlog_entry_void();
2133
2134 dlm_unregister_eviction_cb(&osb->osb_eviction_cb);
2135
2136 ocfs2_drop_osb_locks(osb);
2137
2138 if (osb->vote_task) {
2139 kthread_stop(osb->vote_task);
2140 osb->vote_task = NULL;
2141 }
2142
2143 ocfs2_lock_res_free(&osb->osb_super_lockres);
2144 ocfs2_lock_res_free(&osb->osb_rename_lockres);
2145
2146 dlm_unregister_domain(osb->dlm);
2147 osb->dlm = NULL;
2148
2149 ocfs2_dlm_shutdown_debug(osb);
2150
2151 mlog_exit_void();
2152}
2153
2a45f2d1 2154static void ocfs2_unlock_ast(void *opaque, enum dlm_status status)
ccd979bd
MF		 2155{
2156 struct ocfs2_lock_res *lockres = opaque;
2157 unsigned long flags;
2158
2159 mlog_entry_void();
2160
2161 mlog(0, "UNLOCK AST called on lock %s, action = %d\n", lockres->l_name,
2162 lockres->l_unlock_action);
2163
2164 spin_lock_irqsave(&lockres->l_lock, flags);
2165 /* We tried to cancel a convert request, but it was already
2166 * granted. All we want to do here is clear our unlock
2167 * state. The wake_up call done at the bottom is redundant
2168 * (ocfs2_prepare_cancel_convert doesn't sleep on this) but doesn't
2169 * hurt anything anyway */
2170 if (status == DLM_CANCELGRANT &&
2171 lockres->l_unlock_action == OCFS2_UNLOCK_CANCEL_CONVERT) {
2172 mlog(0, "Got cancelgrant for %s\n", lockres->l_name);
2173
2174 /* We don't clear the busy flag in this case as it
2175 * should have been cleared by the ast which the dlm
2176 * has called. */
2177 goto complete_unlock;
2178 }
2179
2180 if (status != DLM_NORMAL) {
2181 mlog(ML_ERROR, "Dlm passes status %d for lock %s, "
2182 "unlock_action %d\n", status, lockres->l_name,
2183 lockres->l_unlock_action);
2184 spin_unlock_irqrestore(&lockres->l_lock, flags);
2185 return;
2186 }
2187
2188 switch(lockres->l_unlock_action) {
2189 case OCFS2_UNLOCK_CANCEL_CONVERT:
2190 mlog(0, "Cancel convert success for %s\n", lockres->l_name);
2191 lockres->l_action = OCFS2_AST_INVALID;
2192 break;
2193 case OCFS2_UNLOCK_DROP_LOCK:
2194 lockres->l_level = LKM_IVMODE;
2195 break;
2196 default:
2197 BUG();
2198 }
2199
2200 lockres_clear_flags(lockres, OCFS2_LOCK_BUSY);
2201complete_unlock:
2202 lockres->l_unlock_action = OCFS2_UNLOCK_INVALID;
2203 spin_unlock_irqrestore(&lockres->l_lock, flags);
2204
2205 wake_up(&lockres->l_event);
2206
2207 mlog_exit_void();
2208}
2209
2210typedef void (ocfs2_pre_drop_cb_t)(struct ocfs2_lock_res *, void *);
2211
2212struct drop_lock_cb {
2213 ocfs2_pre_drop_cb_t *drop_func;
2214 void *drop_data;
2215};
2216
2217static int ocfs2_drop_lock(struct ocfs2_super *osb,
2218 struct ocfs2_lock_res *lockres,
2219 struct drop_lock_cb *dcb)
2220{
2221 enum dlm_status status;
2222 unsigned long flags;
b80fc012 2223 int lkm_flags = 0;
ccd979bd
MF		 2224
2225 /* We didn't get anywhere near actually using this lockres. */
2226 if (!(lockres->l_flags & OCFS2_LOCK_INITIALIZED))
2227 goto out;
2228
b80fc012
MF		 2229 if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB)
2230 lkm_flags |= LKM_VALBLK;
2231
ccd979bd
MF		 2232 spin_lock_irqsave(&lockres->l_lock, flags);
2233
2234 mlog_bug_on_msg(!(lockres->l_flags & OCFS2_LOCK_FREEING),
2235 "lockres %s, flags 0x%lx\n",
2236 lockres->l_name, lockres->l_flags);
2237
2238 while (lockres->l_flags & OCFS2_LOCK_BUSY) {
2239 mlog(0, "waiting on busy lock \"%s\": flags = %lx, action = "
2240 "%u, unlock_action = %u\n",
2241 lockres->l_name, lockres->l_flags, lockres->l_action,
2242 lockres->l_unlock_action);
2243
2244 spin_unlock_irqrestore(&lockres->l_lock, flags);
2245
2246 /* XXX: Today we just wait on any busy
2247 * locks... Perhaps we need to cancel converts in the
2248 * future? */
2249 ocfs2_wait_on_busy_lock(lockres);
2250
2251 spin_lock_irqsave(&lockres->l_lock, flags);
2252 }
2253
2254 if (dcb)
2255 dcb->drop_func(lockres, dcb->drop_data);
2256
2257 if (lockres->l_flags & OCFS2_LOCK_BUSY)
2258 mlog(ML_ERROR, "destroying busy lock: \"%s\"\n",
2259 lockres->l_name);
2260 if (lockres->l_flags & OCFS2_LOCK_BLOCKED)
2261 mlog(0, "destroying blocked lock: \"%s\"\n", lockres->l_name);
2262
2263 if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) {
2264 spin_unlock_irqrestore(&lockres->l_lock, flags);
2265 goto out;
2266 }
2267
2268 lockres_clear_flags(lockres, OCFS2_LOCK_ATTACHED);
2269
2270 /* make sure we never get here while waiting for an ast to
2271 * fire. */
2272 BUG_ON(lockres->l_action != OCFS2_AST_INVALID);
2273
2274 /* is this necessary? */
2275 lockres_or_flags(lockres, OCFS2_LOCK_BUSY);
2276 lockres->l_unlock_action = OCFS2_UNLOCK_DROP_LOCK;
2277 spin_unlock_irqrestore(&lockres->l_lock, flags);
2278
2279 mlog(0, "lock %s\n", lockres->l_name);
2280
b80fc012 2281 status = dlmunlock(osb->dlm, &lockres->l_lksb, lkm_flags,
2a45f2d1 2282 ocfs2_unlock_ast, lockres);
ccd979bd
MF		 2283 if (status != DLM_NORMAL) {
2284 ocfs2_log_dlm_error("dlmunlock", status, lockres);
2285 mlog(ML_ERROR, "lockres flags: %lu\n", lockres->l_flags);
2286 dlm_print_one_lock(lockres->l_lksb.lockid);
2287 BUG();
2288 }
2289 mlog(0, "lock %s, successfull return from dlmunlock\n",
2290 lockres->l_name);
2291
2292 ocfs2_wait_on_busy_lock(lockres);
2293out:
2294 mlog_exit(0);
2295 return 0;
2296}
2297
2298/* Mark the lockres as being dropped. It will no longer be
2299 * queued if blocking, but we still may have to wait on it
2300 * being dequeued from the vote thread before we can consider
2301 * it safe to drop.
2302 *
2303 * You can *not* attempt to call cluster_lock on this lockres anymore. */
2304void ocfs2_mark_lockres_freeing(struct ocfs2_lock_res *lockres)
2305{
2306 int status;
2307 struct ocfs2_mask_waiter mw;
2308 unsigned long flags;
2309
2310 ocfs2_init_mask_waiter(&mw);
2311
2312 spin_lock_irqsave(&lockres->l_lock, flags);
2313 lockres->l_flags |= OCFS2_LOCK_FREEING;
2314 while (lockres->l_flags & OCFS2_LOCK_QUEUED) {
2315 lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_QUEUED, 0);
2316 spin_unlock_irqrestore(&lockres->l_lock, flags);
2317
2318 mlog(0, "Waiting on lockres %s\n", lockres->l_name);
2319
2320 status = ocfs2_wait_for_mask(&mw);
2321 if (status)
2322 mlog_errno(status);
2323
2324 spin_lock_irqsave(&lockres->l_lock, flags);
2325 }
2326 spin_unlock_irqrestore(&lockres->l_lock, flags);
2327}
2328
d680efe9
MF		 2329void ocfs2_simple_drop_lockres(struct ocfs2_super *osb,
2330 struct ocfs2_lock_res *lockres)
ccd979bd 2331{
d680efe9 2332 int ret;
ccd979bd 2333
d680efe9
MF		 2334 ocfs2_mark_lockres_freeing(lockres);
2335 ret = ocfs2_drop_lock(osb, lockres, NULL);
2336 if (ret)
2337 mlog_errno(ret);
2338}
ccd979bd 2339
d680efe9
MF		 2340static void ocfs2_drop_osb_locks(struct ocfs2_super *osb)
2341{
2342 ocfs2_simple_drop_lockres(osb, &osb->osb_super_lockres);
2343 ocfs2_simple_drop_lockres(osb, &osb->osb_rename_lockres);
ccd979bd
MF		 2344}
2345
2346static void ocfs2_meta_pre_drop(struct ocfs2_lock_res *lockres, void *data)
2347{
2348 struct inode *inode = data;
2349
2350 /* the metadata lock requires a bit more work as we have an
2351 * LVB to worry about. */
2352 if (lockres->l_flags & OCFS2_LOCK_ATTACHED &&
2353 lockres->l_level == LKM_EXMODE &&
2354 !(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH))
2355 __ocfs2_stuff_meta_lvb(inode);
2356}
2357
2358int ocfs2_drop_inode_locks(struct inode *inode)
2359{
2360 int status, err;
2361 struct drop_lock_cb meta_dcb = { ocfs2_meta_pre_drop, inode, };
2362
2363 mlog_entry_void();
2364
2365 /* No need to call ocfs2_mark_lockres_freeing here -
2366 * ocfs2_clear_inode has done it for us. */
2367
2368 err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb),
2369 &OCFS2_I(inode)->ip_data_lockres,
2370 NULL);
2371 if (err < 0)
2372 mlog_errno(err);
2373
2374 status = err;
2375
2376 err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb),
2377 &OCFS2_I(inode)->ip_meta_lockres,
2378 &meta_dcb);
2379 if (err < 0)
2380 mlog_errno(err);
2381 if (err < 0 && !status)
2382 status = err;
2383
2384 err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb),
2385 &OCFS2_I(inode)->ip_rw_lockres,
2386 NULL);
2387 if (err < 0)
2388 mlog_errno(err);
2389 if (err < 0 && !status)
2390 status = err;
2391
2392 mlog_exit(status);
2393 return status;
2394}
2395
2396static void ocfs2_prepare_downconvert(struct ocfs2_lock_res *lockres,
2397 int new_level)
2398{
2399 assert_spin_locked(&lockres->l_lock);
2400
2401 BUG_ON(lockres->l_blocking <= LKM_NLMODE);
2402
2403 if (lockres->l_level <= new_level) {
2404 mlog(ML_ERROR, "lockres->l_level (%u) <= new_level (%u)\n",
2405 lockres->l_level, new_level);
2406 BUG();
2407 }
2408
2409 mlog(0, "lock %s, new_level = %d, l_blocking = %d\n",
2410 lockres->l_name, new_level, lockres->l_blocking);
2411
2412 lockres->l_action = OCFS2_AST_DOWNCONVERT;
2413 lockres->l_requested = new_level;
2414 lockres_or_flags(lockres, OCFS2_LOCK_BUSY);
2415}
2416
2417static int ocfs2_downconvert_lock(struct ocfs2_super *osb,
2418 struct ocfs2_lock_res *lockres,
2419 int new_level,
2420 int lvb)
2421{
2422 int ret, dlm_flags = LKM_CONVERT;
2423 enum dlm_status status;
2424
2425 mlog_entry_void();
2426
2427 if (lvb)
2428 dlm_flags |= LKM_VALBLK;
2429
2430 status = dlmlock(osb->dlm,
2431 new_level,
2432 &lockres->l_lksb,
2433 dlm_flags,
2434 lockres->l_name,
f0681062 2435 OCFS2_LOCK_ID_MAX_LEN - 1,
e92d57df 2436 ocfs2_locking_ast,
ccd979bd 2437 lockres,
aa2623ad 2438 ocfs2_blocking_ast);
ccd979bd
MF		 2439 if (status != DLM_NORMAL) {
2440 ocfs2_log_dlm_error("dlmlock", status, lockres);
2441 ret = -EINVAL;
2442 ocfs2_recover_from_dlm_error(lockres, 1);
2443 goto bail;
2444 }
2445
2446 ret = 0;
2447bail:
2448 mlog_exit(ret);
2449 return ret;
2450}
2451
2452/* returns 1 when the caller should unlock and call dlmunlock */
2453static int ocfs2_prepare_cancel_convert(struct ocfs2_super *osb,
2454 struct ocfs2_lock_res *lockres)
2455{
2456 assert_spin_locked(&lockres->l_lock);
2457
2458 mlog_entry_void();
2459 mlog(0, "lock %s\n", lockres->l_name);
2460
2461 if (lockres->l_unlock_action == OCFS2_UNLOCK_CANCEL_CONVERT) {
2462 /* If we're already trying to cancel a lock conversion
2463 * then just drop the spinlock and allow the caller to
2464 * requeue this lock. */
2465
2466 mlog(0, "Lockres %s, skip convert\n", lockres->l_name);
2467 return 0;
2468 }
2469
2470 /* were we in a convert when we got the bast fire? */
2471 BUG_ON(lockres->l_action != OCFS2_AST_CONVERT &&
2472 lockres->l_action != OCFS2_AST_DOWNCONVERT);
2473 /* set things up for the unlockast to know to just
2474 * clear out the ast_action and unset busy, etc. */
2475 lockres->l_unlock_action = OCFS2_UNLOCK_CANCEL_CONVERT;
2476
2477 mlog_bug_on_msg(!(lockres->l_flags & OCFS2_LOCK_BUSY),
2478 "lock %s, invalid flags: 0x%lx\n",
2479 lockres->l_name, lockres->l_flags);
2480
2481 return 1;
2482}
2483
2484static int ocfs2_cancel_convert(struct ocfs2_super *osb,
2485 struct ocfs2_lock_res *lockres)
2486{
2487 int ret;
2488 enum dlm_status status;
2489
2490 mlog_entry_void();
2491 mlog(0, "lock %s\n", lockres->l_name);
2492
2493 ret = 0;
2494 status = dlmunlock(osb->dlm,
2495 &lockres->l_lksb,
2496 LKM_CANCEL,
2a45f2d1 2497 ocfs2_unlock_ast,
ccd979bd
MF		 2498 lockres);
2499 if (status != DLM_NORMAL) {
2500 ocfs2_log_dlm_error("dlmunlock", status, lockres);
2501 ret = -EINVAL;
2502 ocfs2_recover_from_dlm_error(lockres, 0);
2503 }
2504
2505 mlog(0, "lock %s return from dlmunlock\n", lockres->l_name);
2506
2507 mlog_exit(ret);
2508 return ret;
2509}
2510
2511static inline int ocfs2_can_downconvert_meta_lock(struct inode *inode,
2512 struct ocfs2_lock_res *lockres,
2513 int new_level)
2514{
2515 int ret;
2516
2517 mlog_entry_void();
2518
2519 BUG_ON(new_level != LKM_NLMODE && new_level != LKM_PRMODE);
2520
2521 if (lockres->l_flags & OCFS2_LOCK_REFRESHING) {
2522 ret = 0;
2523 mlog(0, "lockres %s currently being refreshed -- backing "
2524 "off!\n", lockres->l_name);
2525 } else if (new_level == LKM_PRMODE)
2526 ret = !lockres->l_ex_holders &&
2527 ocfs2_inode_fully_checkpointed(inode);
2528 else /* Must be NLMODE we're converting to. */
2529 ret = !lockres->l_ro_holders && !lockres->l_ex_holders &&
2530 ocfs2_inode_fully_checkpointed(inode);
2531
2532 mlog_exit(ret);
2533 return ret;
2534}
2535
2536static int ocfs2_do_unblock_meta(struct inode *inode,
2537 int *requeue)
2538{
2539 int new_level;
2540 int set_lvb = 0;
2541 int ret = 0;
2542 struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_meta_lockres;
2543 unsigned long flags;
2544
2545 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2546
2547 mlog_entry_void();
2548
2549 spin_lock_irqsave(&lockres->l_lock, flags);
2550
2551 BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED));
2552
2553 mlog(0, "l_level=%d, l_blocking=%d\n", lockres->l_level,
2554 lockres->l_blocking);
2555
2556 BUG_ON(lockres->l_level != LKM_EXMODE &&
2557 lockres->l_level != LKM_PRMODE);
2558
2559 if (lockres->l_flags & OCFS2_LOCK_BUSY) {
2560 *requeue = 1;
2561 ret = ocfs2_prepare_cancel_convert(osb, lockres);
2562 spin_unlock_irqrestore(&lockres->l_lock, flags);
2563 if (ret) {
2564 ret = ocfs2_cancel_convert(osb, lockres);
2565 if (ret < 0)
2566 mlog_errno(ret);
2567 }
2568 goto leave;
2569 }
2570
2571 new_level = ocfs2_highest_compat_lock_level(lockres->l_blocking);
2572
2573 mlog(0, "l_level=%d, l_blocking=%d, new_level=%d\n",
2574 lockres->l_level, lockres->l_blocking, new_level);
2575
2576 if (ocfs2_can_downconvert_meta_lock(inode, lockres, new_level)) {
2577 if (lockres->l_level == LKM_EXMODE)
2578 set_lvb = 1;
2579
2580 /* If the lock hasn't been refreshed yet (rare), then
2581 * our memory inode values are old and we skip
2582 * stuffing the lvb. There's no need to actually clear
2583 * out the lvb here as it's value is still valid. */
2584 if (!(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) {
2585 if (set_lvb)
2586 __ocfs2_stuff_meta_lvb(inode);
2587 } else
2588 mlog(0, "lockres %s: downconverting stale lock!\n",
2589 lockres->l_name);
2590
2591 mlog(0, "calling ocfs2_downconvert_lock with l_level=%d, "
2592 "l_blocking=%d, new_level=%d\n",
2593 lockres->l_level, lockres->l_blocking, new_level);
2594
2595 ocfs2_prepare_downconvert(lockres, new_level);
2596 spin_unlock_irqrestore(&lockres->l_lock, flags);
2597 ret = ocfs2_downconvert_lock(osb, lockres, new_level, set_lvb);
2598 goto leave;
2599 }
2600 if (!ocfs2_inode_fully_checkpointed(inode))
2601 ocfs2_start_checkpoint(osb);
2602
2603 *requeue = 1;
2604 spin_unlock_irqrestore(&lockres->l_lock, flags);
2605 ret = 0;
2606leave:
2607 mlog_exit(ret);
2608 return ret;
2609}
2610
2611static int ocfs2_generic_unblock_lock(struct ocfs2_super *osb,
2612 struct ocfs2_lock_res *lockres,
d680efe9 2613 struct ocfs2_unblock_ctl *ctl,
ccd979bd
MF		 2614 ocfs2_convert_worker_t *worker)
2615{
2616 unsigned long flags;
2617 int blocking;
2618 int new_level;
2619 int ret = 0;
2620
2621 mlog_entry_void();
2622
2623 spin_lock_irqsave(&lockres->l_lock, flags);
2624
2625 BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED));
2626
2627recheck:
2628 if (lockres->l_flags & OCFS2_LOCK_BUSY) {
d680efe9 2629 ctl->requeue = 1;
ccd979bd
MF		 2630 ret = ocfs2_prepare_cancel_convert(osb, lockres);
2631 spin_unlock_irqrestore(&lockres->l_lock, flags);
2632 if (ret) {
2633 ret = ocfs2_cancel_convert(osb, lockres);
2634 if (ret < 0)
2635 mlog_errno(ret);
2636 }
2637 goto leave;
2638 }
2639
2640 /* if we're blocking an exclusive and we have *any* holders,
2641 * then requeue. */
2642 if ((lockres->l_blocking == LKM_EXMODE)
f7fbfdd1
MF		 2643 && (lockres->l_ex_holders || lockres->l_ro_holders))
2644 goto leave_requeue;
ccd979bd
MF		 2645
2646 /* If it's a PR we're blocking, then only
2647 * requeue if we've got any EX holders */
2648 if (lockres->l_blocking == LKM_PRMODE &&
f7fbfdd1
MF		 2649 lockres->l_ex_holders)
2650 goto leave_requeue;
2651
2652 /*
2653 * Can we get a lock in this state if the holder counts are
2654 * zero? The meta data unblock code used to check this.
2655 */
2656 if ((lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH)
2657 && (lockres->l_flags & OCFS2_LOCK_REFRESHING))
2658 goto leave_requeue;
ccd979bd
MF		 2659
2660 /* If we get here, then we know that there are no more
2661 * incompatible holders (and anyone asking for an incompatible
2662 * lock is blocked). We can now downconvert the lock */
2663 if (!worker)
2664 goto downconvert;
2665
2666 /* Some lockres types want to do a bit of work before
2667 * downconverting a lock. Allow that here. The worker function
2668 * may sleep, so we save off a copy of what we're blocking as
2669 * it may change while we're not holding the spin lock. */
2670 blocking = lockres->l_blocking;
2671 spin_unlock_irqrestore(&lockres->l_lock, flags);
2672
d680efe9
MF		 2673 ctl->unblock_action = worker(lockres, blocking);
2674
2675 if (ctl->unblock_action == UNBLOCK_STOP_POST)
2676 goto leave;
ccd979bd
MF		 2677
2678 spin_lock_irqsave(&lockres->l_lock, flags);
2679 if (blocking != lockres->l_blocking) {
2680 /* If this changed underneath us, then we can't drop
2681 * it just yet. */
2682 goto recheck;
2683 }
2684
2685downconvert:
d680efe9 2686 ctl->requeue = 0;
ccd979bd
MF		 2687 new_level = ocfs2_highest_compat_lock_level(lockres->l_blocking);
2688
2689 ocfs2_prepare_downconvert(lockres, new_level);
2690 spin_unlock_irqrestore(&lockres->l_lock, flags);
2691 ret = ocfs2_downconvert_lock(osb, lockres, new_level, 0);
2692leave:
2693 mlog_exit(ret);
2694 return ret;
f7fbfdd1
MF		 2695
2696leave_requeue:
2697 spin_unlock_irqrestore(&lockres->l_lock, flags);
2698 ctl->requeue = 1;
2699
2700 mlog_exit(0);
2701 return 0;
ccd979bd
MF		 2702}
2703
d680efe9
MF		 2704static int ocfs2_data_convert_worker(struct ocfs2_lock_res *lockres,
2705 int blocking)
ccd979bd
MF		 2706{
2707 struct inode *inode;
2708 struct address_space *mapping;
2709
ccd979bd
MF		 2710 inode = ocfs2_lock_res_inode(lockres);
2711 mapping = inode->i_mapping;
2712
2713 if (filemap_fdatawrite(mapping)) {
b0697053
MF		 2714 mlog(ML_ERROR, "Could not sync inode %llu for downconvert!",
2715 (unsigned long long)OCFS2_I(inode)->ip_blkno);
ccd979bd
MF		 2716 }
2717 sync_mapping_buffers(mapping);
2718 if (blocking == LKM_EXMODE) {
2719 truncate_inode_pages(mapping, 0);
2720 unmap_mapping_range(mapping, 0, 0, 0);
2721 } else {
2722 /* We only need to wait on the I/O if we're not also
2723 * truncating pages because truncate_inode_pages waits
2724 * for us above. We don't truncate pages if we're
2725 * blocking anything < EXMODE because we want to keep
2726 * them around in that case. */
2727 filemap_fdatawait(mapping);
2728 }
2729
d680efe9 2730 return UNBLOCK_CONTINUE;
ccd979bd
MF		 2731}
2732
2733int ocfs2_unblock_data(struct ocfs2_lock_res *lockres,
d680efe9 2734 struct ocfs2_unblock_ctl *ctl)
ccd979bd
MF		 2735{
2736 int status;
2737 struct inode *inode;
2738 struct ocfs2_super *osb;
2739
2740 mlog_entry_void();
2741
2742 inode = ocfs2_lock_res_inode(lockres);
2743 osb = OCFS2_SB(inode->i_sb);
2744
b0697053
MF		 2745 mlog(0, "unblock inode %llu\n",
2746 (unsigned long long)OCFS2_I(inode)->ip_blkno);
ccd979bd 2747
d680efe9 2748 status = ocfs2_generic_unblock_lock(osb, lockres, ctl,
ccd979bd
MF		 2749 ocfs2_data_convert_worker);
2750 if (status < 0)
2751 mlog_errno(status);
2752
b0697053 2753 mlog(0, "inode %llu, requeue = %d\n",
d680efe9 2754 (unsigned long long)OCFS2_I(inode)->ip_blkno, ctl->requeue);
ccd979bd
MF		 2755
2756 mlog_exit(status);
2757 return status;
2758}
2759
2760static int ocfs2_unblock_inode_lock(struct ocfs2_lock_res *lockres,
d680efe9 2761 struct ocfs2_unblock_ctl *ctl)
ccd979bd
MF		 2762{
2763 int status;
2764 struct inode *inode;
2765
2766 mlog_entry_void();
2767
2768 mlog(0, "Unblock lockres %s\n", lockres->l_name);
2769
2770 inode = ocfs2_lock_res_inode(lockres);
2771
2772 status = ocfs2_generic_unblock_lock(OCFS2_SB(inode->i_sb),
d680efe9 2773 lockres, ctl, NULL);
ccd979bd
MF		 2774 if (status < 0)
2775 mlog_errno(status);
2776
2777 mlog_exit(status);
2778 return status;
2779}
2780
d680efe9
MF		 2781static int ocfs2_unblock_meta(struct ocfs2_lock_res *lockres,
2782 struct ocfs2_unblock_ctl *ctl)
ccd979bd
MF		 2783{
2784 int status;
2785 struct inode *inode;
2786
2787 mlog_entry_void();
2788
2789 inode = ocfs2_lock_res_inode(lockres);
2790
b0697053
MF		 2791 mlog(0, "unblock inode %llu\n",
2792 (unsigned long long)OCFS2_I(inode)->ip_blkno);
ccd979bd 2793
d680efe9 2794 status = ocfs2_do_unblock_meta(inode, &ctl->requeue);
ccd979bd
MF		 2795 if (status < 0)
2796 mlog_errno(status);
2797
b0697053 2798 mlog(0, "inode %llu, requeue = %d\n",
d680efe9 2799 (unsigned long long)OCFS2_I(inode)->ip_blkno, ctl->requeue);
ccd979bd
MF		 2800
2801 mlog_exit(status);
2802 return status;
2803}
2804
d680efe9
MF		 2805/*
2806 * Does the final reference drop on our dentry lock. Right now this
2807 * happens in the vote thread, but we could choose to simplify the
2808 * dlmglue API and push these off to the ocfs2_wq in the future.
2809 */
2810static void ocfs2_dentry_post_unlock(struct ocfs2_super *osb,
2811 struct ocfs2_lock_res *lockres)
2812{
2813 struct ocfs2_dentry_lock *dl = ocfs2_lock_res_dl(lockres);
2814 ocfs2_dentry_lock_put(osb, dl);
2815}
2816
2817/*
2818 * d_delete() matching dentries before the lock downconvert.
2819 *
2820 * At this point, any process waiting to destroy the
2821 * dentry_lock due to last ref count is stopped by the
2822 * OCFS2_LOCK_QUEUED flag.
2823 *
2824 * We have two potential problems
2825 *
2826 * 1) If we do the last reference drop on our dentry_lock (via dput)
2827 * we'll wind up in ocfs2_release_dentry_lock(), waiting on
2828 * the downconvert to finish. Instead we take an elevated
2829 * reference and push the drop until after we've completed our
2830 * unblock processing.
2831 *
2832 * 2) There might be another process with a final reference,
2833 * waiting on us to finish processing. If this is the case, we
2834 * detect it and exit out - there's no more dentries anyway.
2835 */
2836static int ocfs2_dentry_convert_worker(struct ocfs2_lock_res *lockres,
2837 int blocking)
2838{
2839 struct ocfs2_dentry_lock *dl = ocfs2_lock_res_dl(lockres);
2840 struct ocfs2_inode_info *oi = OCFS2_I(dl->dl_inode);
2841 struct dentry *dentry;
2842 unsigned long flags;
2843 int extra_ref = 0;
2844
2845 /*
2846 * This node is blocking another node from getting a read
2847 * lock. This happens when we've renamed within a
2848 * directory. We've forced the other nodes to d_delete(), but
2849 * we never actually dropped our lock because it's still
2850 * valid. The downconvert code will retain a PR for this node,
2851 * so there's no further work to do.
2852 */
2853 if (blocking == LKM_PRMODE)
2854 return UNBLOCK_CONTINUE;
2855
2856 /*
2857 * Mark this inode as potentially orphaned. The code in
2858 * ocfs2_delete_inode() will figure out whether it actually
2859 * needs to be freed or not.
2860 */
2861 spin_lock(&oi->ip_lock);
2862 oi->ip_flags |= OCFS2_INODE_MAYBE_ORPHANED;
2863 spin_unlock(&oi->ip_lock);
2864
2865 /*
2866 * Yuck. We need to make sure however that the check of
2867 * OCFS2_LOCK_FREEING and the extra reference are atomic with
2868 * respect to a reference decrement or the setting of that
2869 * flag.
2870 */
2871 spin_lock_irqsave(&lockres->l_lock, flags);
2872 spin_lock(&dentry_attach_lock);
2873 if (!(lockres->l_flags & OCFS2_LOCK_FREEING)
2874 && dl->dl_count) {
2875 dl->dl_count++;
2876 extra_ref = 1;
2877 }
2878 spin_unlock(&dentry_attach_lock);
2879 spin_unlock_irqrestore(&lockres->l_lock, flags);
2880
2881 mlog(0, "extra_ref = %d\n", extra_ref);
2882
2883 /*
2884 * We have a process waiting on us in ocfs2_dentry_iput(),
2885 * which means we can't have any more outstanding
2886 * aliases. There's no need to do any more work.
2887 */
2888 if (!extra_ref)
2889 return UNBLOCK_CONTINUE;
2890
2891 spin_lock(&dentry_attach_lock);
2892 while (1) {
2893 dentry = ocfs2_find_local_alias(dl->dl_inode,
2894 dl->dl_parent_blkno, 1);
2895 if (!dentry)
2896 break;
2897 spin_unlock(&dentry_attach_lock);
2898
2899 mlog(0, "d_delete(%.*s);\n", dentry->d_name.len,
2900 dentry->d_name.name);
2901
2902 /*
2903 * The following dcache calls may do an
2904 * iput(). Normally we don't want that from the
2905 * downconverting thread, but in this case it's ok
2906 * because the requesting node already has an
2907 * exclusive lock on the inode, so it can't be queued
2908 * for a downconvert.
2909 */
2910 d_delete(dentry);
2911 dput(dentry);
2912
2913 spin_lock(&dentry_attach_lock);
2914 }
2915 spin_unlock(&dentry_attach_lock);
2916
2917 /*
2918 * If we are the last holder of this dentry lock, there is no
2919 * reason to downconvert so skip straight to the unlock.
2920 */
2921 if (dl->dl_count == 1)
2922 return UNBLOCK_STOP_POST;
2923
2924 return UNBLOCK_CONTINUE_POST;
2925}
2926
2927static int ocfs2_unblock_dentry_lock(struct ocfs2_lock_res *lockres,
2928 struct ocfs2_unblock_ctl *ctl)
2929{
2930 int ret;
2931 struct ocfs2_dentry_lock *dl = ocfs2_lock_res_dl(lockres);
2932 struct ocfs2_super *osb = OCFS2_SB(dl->dl_inode->i_sb);
2933
2934 mlog(0, "unblock dentry lock: %llu\n",
2935 (unsigned long long)OCFS2_I(dl->dl_inode)->ip_blkno);
2936
2937 ret = ocfs2_generic_unblock_lock(osb,
2938 lockres,
2939 ctl,
2940 ocfs2_dentry_convert_worker);
2941 if (ret < 0)
2942 mlog_errno(ret);
2943
2944 mlog(0, "requeue = %d, post = %d\n", ctl->requeue, ctl->unblock_action);
2945
2946 return ret;
2947}
2948
ccd979bd
MF		 2949/* Generic unblock function for any lockres whose private data is an
2950 * ocfs2_super pointer. */
2951static int ocfs2_unblock_osb_lock(struct ocfs2_lock_res *lockres,
d680efe9 2952 struct ocfs2_unblock_ctl *ctl)
ccd979bd
MF		 2953{
2954 int status;
2955 struct ocfs2_super *osb;
2956
2957 mlog_entry_void();
2958
2959 mlog(0, "Unblock lockres %s\n", lockres->l_name);
2960
aa2623ad 2961 osb = ocfs2_get_lockres_osb(lockres);
ccd979bd
MF		 2962
2963 status = ocfs2_generic_unblock_lock(osb,
2964 lockres,
d680efe9 2965 ctl,
ccd979bd
MF		 2966 NULL);
2967 if (status < 0)
2968 mlog_errno(status);
2969
2970 mlog_exit(status);
2971 return status;
2972}
2973
2974void ocfs2_process_blocked_lock(struct ocfs2_super *osb,
2975 struct ocfs2_lock_res *lockres)
2976{
2977 int status;
d680efe9 2978 struct ocfs2_unblock_ctl ctl = {0, 0,};
ccd979bd
MF		 2979 unsigned long flags;
2980
2981 /* Our reference to the lockres in this function can be
2982 * considered valid until we remove the OCFS2_LOCK_QUEUED
2983 * flag. */
2984
2985 mlog_entry_void();
2986
2987 BUG_ON(!lockres);
2988 BUG_ON(!lockres->l_ops);
2989 BUG_ON(!lockres->l_ops->unblock);
2990
2991 mlog(0, "lockres %s blocked.\n", lockres->l_name);
2992
2993 /* Detect whether a lock has been marked as going away while
2994 * the vote thread was processing other things. A lock can
2995 * still be marked with OCFS2_LOCK_FREEING after this check,
2996 * but short circuiting here will still save us some
2997 * performance. */
2998 spin_lock_irqsave(&lockres->l_lock, flags);
2999 if (lockres->l_flags & OCFS2_LOCK_FREEING)
3000 goto unqueue;
3001 spin_unlock_irqrestore(&lockres->l_lock, flags);
3002
d680efe9 3003 status = lockres->l_ops->unblock(lockres, &ctl);
ccd979bd
MF		 3004 if (status < 0)
3005 mlog_errno(status);
3006
3007 spin_lock_irqsave(&lockres->l_lock, flags);
3008unqueue:
d680efe9 3009 if (lockres->l_flags & OCFS2_LOCK_FREEING || !ctl.requeue) {
ccd979bd
MF		 3010 lockres_clear_flags(lockres, OCFS2_LOCK_QUEUED);
3011 } else
3012 ocfs2_schedule_blocked_lock(osb, lockres);
3013
3014 mlog(0, "lockres %s, requeue = %s.\n", lockres->l_name,
d680efe9 3015 ctl.requeue ? "yes" : "no");
ccd979bd
MF		 3016 spin_unlock_irqrestore(&lockres->l_lock, flags);
3017
d680efe9
MF		 3018 if (ctl.unblock_action != UNBLOCK_CONTINUE
3019 && lockres->l_ops->post_unlock)
3020 lockres->l_ops->post_unlock(osb, lockres);
3021
ccd979bd
MF		 3022 mlog_exit_void();
3023}
3024
3025static void ocfs2_schedule_blocked_lock(struct ocfs2_super *osb,
3026 struct ocfs2_lock_res *lockres)
3027{
3028 mlog_entry_void();
3029
3030 assert_spin_locked(&lockres->l_lock);
3031
3032 if (lockres->l_flags & OCFS2_LOCK_FREEING) {
3033 /* Do not schedule a lock for downconvert when it's on
3034 * the way to destruction - any nodes wanting access
3035 * to the resource will get it soon. */
3036 mlog(0, "Lockres %s won't be scheduled: flags 0x%lx\n",
3037 lockres->l_name, lockres->l_flags);
3038 return;
3039 }
3040
3041 lockres_or_flags(lockres, OCFS2_LOCK_QUEUED);
3042
3043 spin_lock(&osb->vote_task_lock);
3044 if (list_empty(&lockres->l_blocked_list)) {
3045 list_add_tail(&lockres->l_blocked_list,
3046 &osb->blocked_lock_list);
3047 osb->blocked_lock_count++;
3048 }
3049 spin_unlock(&osb->vote_task_lock);
3050
3051 mlog_exit_void();
3052}
3053
3054/* This aids in debugging situations where a bad LVB might be involved. */
3055void ocfs2_dump_meta_lvb_info(u64 level,
3056 const char *function,
3057 unsigned int line,
3058 struct ocfs2_lock_res *lockres)
3059{
3060 struct ocfs2_meta_lvb *lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb;
3061
3062 mlog(level, "LVB information for %s (called from %s:%u):\n",
3063 lockres->l_name, function, line);
f9e2d82e
MF		 3064 mlog(level, "version: %u, clusters: %u, generation: 0x%x\n",
3065 lvb->lvb_version, be32_to_cpu(lvb->lvb_iclusters),
3066 be32_to_cpu(lvb->lvb_igeneration));
b0697053
MF		 3067 mlog(level, "size: %llu, uid %u, gid %u, mode 0x%x\n",
3068 (unsigned long long)be64_to_cpu(lvb->lvb_isize),
3069 be32_to_cpu(lvb->lvb_iuid), be32_to_cpu(lvb->lvb_igid),
3070 be16_to_cpu(lvb->lvb_imode));
3071 mlog(level, "nlink %u, atime_packed 0x%llx, ctime_packed 0x%llx, "
ca4d147e 3072 "mtime_packed 0x%llx iattr 0x%x\n", be16_to_cpu(lvb->lvb_inlink),
b0697053
MF		 3073 (long long)be64_to_cpu(lvb->lvb_iatime_packed),
3074 (long long)be64_to_cpu(lvb->lvb_ictime_packed),
ca4d147e
HP		 3075 (long long)be64_to_cpu(lvb->lvb_imtime_packed),
3076 be32_to_cpu(lvb->lvb_iattr));
ccd979bd 3077}
kernel source for telekom puls (alcatel/mediatek)