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ocfs2: Add ->get_osb() dlmglue locking operation
[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
ccd979bd
MF		 70static void ocfs2_inode_bast_func(void *opaque,
71 int level);
d680efe9
MF		 72static void ocfs2_dentry_bast_func(void *opaque,
73 int level);
ccd979bd
MF		 74static void ocfs2_super_bast_func(void *opaque,
75 int level);
ccd979bd
MF		 76static void ocfs2_rename_bast_func(void *opaque,
77 int level);
54a7e755
MF		 78static struct ocfs2_super *ocfs2_get_dentry_osb(struct ocfs2_lock_res *lockres);
79static struct ocfs2_super *ocfs2_get_inode_osb(struct ocfs2_lock_res *lockres);
ccd979bd 80
d680efe9
MF		 81/*
82 * Return value from ocfs2_convert_worker_t functions.
83 *
84 * These control the precise actions of ocfs2_generic_unblock_lock()
85 * and ocfs2_process_blocked_lock()
86 *
87 */
88enum ocfs2_unblock_action {
89 UNBLOCK_CONTINUE = 0, /* Continue downconvert */
90 UNBLOCK_CONTINUE_POST = 1, /* Continue downconvert, fire
91 * ->post_unlock callback */
92 UNBLOCK_STOP_POST = 2, /* Do not downconvert, fire
93 * ->post_unlock() callback. */
94};
95
96struct ocfs2_unblock_ctl {
97 int requeue;
98 enum ocfs2_unblock_action unblock_action;
99};
100
ccd979bd 101static int ocfs2_unblock_meta(struct ocfs2_lock_res *lockres,
d680efe9 102 struct ocfs2_unblock_ctl *ctl);
ccd979bd 103static int ocfs2_unblock_data(struct ocfs2_lock_res *lockres,
d680efe9 104 struct ocfs2_unblock_ctl *ctl);
ccd979bd 105static int ocfs2_unblock_inode_lock(struct ocfs2_lock_res *lockres,
d680efe9
MF		 106 struct ocfs2_unblock_ctl *ctl);
107static int ocfs2_unblock_dentry_lock(struct ocfs2_lock_res *lockres,
108 struct ocfs2_unblock_ctl *ctl);
ccd979bd 109static int ocfs2_unblock_osb_lock(struct ocfs2_lock_res *lockres,
d680efe9
MF		 110 struct ocfs2_unblock_ctl *ctl);
111
112static void ocfs2_dentry_post_unlock(struct ocfs2_super *osb,
113 struct ocfs2_lock_res *lockres);
ccd979bd 114
f625c979
MF		 115/*
116 * OCFS2 Lock Resource Operations
117 *
118 * These fine tune the behavior of the generic dlmglue locking infrastructure.
119 */
ccd979bd 120struct ocfs2_lock_res_ops {
54a7e755
MF		 121 /*
122 * Translate an ocfs2_lock_res * into an ocfs2_super *. Define
123 * this callback if ->l_priv is not an ocfs2_super pointer
124 */
125 struct ocfs2_super * (*get_osb)(struct ocfs2_lock_res *);
ccd979bd 126 void (*bast)(void *, int);
d680efe9
MF		 127 int (*unblock)(struct ocfs2_lock_res *, struct ocfs2_unblock_ctl *);
128 void (*post_unlock)(struct ocfs2_super *, struct ocfs2_lock_res *);
f625c979
MF		 129
130 /*
131 * LOCK_TYPE_* flags which describe the specific requirements
132 * of a lock type. Descriptions of each individual flag follow.
133 */
134 int flags;
ccd979bd
MF		 135};
136
f625c979
MF		 137/*
138 * Some locks want to "refresh" potentially stale data when a
139 * meaningful (PRMODE or EXMODE) lock level is first obtained. If this
140 * flag is set, the OCFS2_LOCK_NEEDS_REFRESH flag will be set on the
141 * individual lockres l_flags member from the ast function. It is
142 * expected that the locking wrapper will clear the
143 * OCFS2_LOCK_NEEDS_REFRESH flag when done.
144 */
145#define LOCK_TYPE_REQUIRES_REFRESH 0x1
146
d680efe9
MF		 147typedef int (ocfs2_convert_worker_t)(struct ocfs2_lock_res *, int);
148static int ocfs2_generic_unblock_lock(struct ocfs2_super *osb,
149 struct ocfs2_lock_res *lockres,
150 struct ocfs2_unblock_ctl *ctl,
151 ocfs2_convert_worker_t *worker);
152
ccd979bd 153static struct ocfs2_lock_res_ops ocfs2_inode_rw_lops = {
54a7e755 154 .get_osb = ocfs2_get_inode_osb,
ccd979bd 155 .bast = ocfs2_inode_bast_func,
ccd979bd 156 .unblock = ocfs2_unblock_inode_lock,
f625c979 157 .flags = 0,
ccd979bd
MF		 158};
159
160static struct ocfs2_lock_res_ops ocfs2_inode_meta_lops = {
54a7e755 161 .get_osb = ocfs2_get_inode_osb,
ccd979bd 162 .bast = ocfs2_inode_bast_func,
ccd979bd 163 .unblock = ocfs2_unblock_meta,
f625c979 164 .flags = LOCK_TYPE_REQUIRES_REFRESH,
ccd979bd
MF		 165};
166
ccd979bd 167static struct ocfs2_lock_res_ops ocfs2_inode_data_lops = {
54a7e755 168 .get_osb = ocfs2_get_inode_osb,
ccd979bd 169 .bast = ocfs2_inode_bast_func,
ccd979bd 170 .unblock = ocfs2_unblock_data,
f625c979 171 .flags = 0,
ccd979bd
MF		 172};
173
174static struct ocfs2_lock_res_ops ocfs2_super_lops = {
ccd979bd 175 .bast = ocfs2_super_bast_func,
ccd979bd 176 .unblock = ocfs2_unblock_osb_lock,
f625c979 177 .flags = LOCK_TYPE_REQUIRES_REFRESH,
ccd979bd
MF		 178};
179
180static struct ocfs2_lock_res_ops ocfs2_rename_lops = {
ccd979bd 181 .bast = ocfs2_rename_bast_func,
ccd979bd 182 .unblock = ocfs2_unblock_osb_lock,
f625c979 183 .flags = 0,
ccd979bd
MF		 184};
185
d680efe9 186static struct ocfs2_lock_res_ops ocfs2_dentry_lops = {
54a7e755 187 .get_osb = ocfs2_get_dentry_osb,
d680efe9 188 .bast = ocfs2_dentry_bast_func,
d680efe9
MF		 189 .unblock = ocfs2_unblock_dentry_lock,
190 .post_unlock = ocfs2_dentry_post_unlock,
f625c979 191 .flags = 0,
d680efe9
MF		 192};
193
ccd979bd
MF		 194static inline int ocfs2_is_inode_lock(struct ocfs2_lock_res *lockres)
195{
196 return lockres->l_type == OCFS2_LOCK_TYPE_META ||
197 lockres->l_type == OCFS2_LOCK_TYPE_DATA ||
198 lockres->l_type == OCFS2_LOCK_TYPE_RW;
199}
200
201static inline int ocfs2_is_super_lock(struct ocfs2_lock_res *lockres)
202{
203 return lockres->l_type == OCFS2_LOCK_TYPE_SUPER;
204}
205
206static inline int ocfs2_is_rename_lock(struct ocfs2_lock_res *lockres)
207{
208 return lockres->l_type == OCFS2_LOCK_TYPE_RENAME;
209}
210
211static inline struct ocfs2_super *ocfs2_lock_res_super(struct ocfs2_lock_res *lockres)
212{
213 BUG_ON(!ocfs2_is_super_lock(lockres)
214 && !ocfs2_is_rename_lock(lockres));
215
216 return (struct ocfs2_super *) lockres->l_priv;
217}
218
219static inline struct inode *ocfs2_lock_res_inode(struct ocfs2_lock_res *lockres)
220{
221 BUG_ON(!ocfs2_is_inode_lock(lockres));
222
223 return (struct inode *) lockres->l_priv;
224}
225
d680efe9
MF		 226static inline struct ocfs2_dentry_lock *ocfs2_lock_res_dl(struct ocfs2_lock_res *lockres)
227{
228 BUG_ON(lockres->l_type != OCFS2_LOCK_TYPE_DENTRY);
229
230 return (struct ocfs2_dentry_lock *)lockres->l_priv;
231}
232
54a7e755
MF		 233static inline struct ocfs2_super *ocfs2_get_lockres_osb(struct ocfs2_lock_res *lockres)
234{
235 if (lockres->l_ops->get_osb)
236 return lockres->l_ops->get_osb(lockres);
237
238 return (struct ocfs2_super *)lockres->l_priv;
239}
240
ccd979bd
MF		 241static int ocfs2_lock_create(struct ocfs2_super *osb,
242 struct ocfs2_lock_res *lockres,
243 int level,
244 int dlm_flags);
245static inline int ocfs2_may_continue_on_blocked_lock(struct ocfs2_lock_res *lockres,
246 int wanted);
247static void ocfs2_cluster_unlock(struct ocfs2_super *osb,
248 struct ocfs2_lock_res *lockres,
249 int level);
250static inline void ocfs2_generic_handle_downconvert_action(struct ocfs2_lock_res *lockres);
251static inline void ocfs2_generic_handle_convert_action(struct ocfs2_lock_res *lockres);
252static inline void ocfs2_generic_handle_attach_action(struct ocfs2_lock_res *lockres);
253static int ocfs2_generic_handle_bast(struct ocfs2_lock_res *lockres, int level);
254static void ocfs2_schedule_blocked_lock(struct ocfs2_super *osb,
255 struct ocfs2_lock_res *lockres);
256static inline void ocfs2_recover_from_dlm_error(struct ocfs2_lock_res *lockres,
257 int convert);
258#define ocfs2_log_dlm_error(_func, _stat, _lockres) do { \
259 mlog(ML_ERROR, "Dlm error \"%s\" while calling %s on " \
260 "resource %s: %s\n", dlm_errname(_stat), _func, \
261 _lockres->l_name, dlm_errmsg(_stat)); \
262} while (0)
263static void ocfs2_vote_on_unlock(struct ocfs2_super *osb,
264 struct ocfs2_lock_res *lockres);
265static int ocfs2_meta_lock_update(struct inode *inode,
266 struct buffer_head **bh);
267static void ocfs2_drop_osb_locks(struct ocfs2_super *osb);
268static inline int ocfs2_highest_compat_lock_level(int level);
269static inline int ocfs2_can_downconvert_meta_lock(struct inode *inode,
270 struct ocfs2_lock_res *lockres,
271 int new_level);
272
ccd979bd
MF		 273static void ocfs2_build_lock_name(enum ocfs2_lock_type type,
274 u64 blkno,
275 u32 generation,
276 char *name)
277{
278 int len;
279
280 mlog_entry_void();
281
282 BUG_ON(type >= OCFS2_NUM_LOCK_TYPES);
283
b0697053
MF		 284 len = snprintf(name, OCFS2_LOCK_ID_MAX_LEN, "%c%s%016llx%08x",
285 ocfs2_lock_type_char(type), OCFS2_LOCK_ID_PAD,
286 (long long)blkno, generation);
ccd979bd
MF		 287
288 BUG_ON(len != (OCFS2_LOCK_ID_MAX_LEN - 1));
289
290 mlog(0, "built lock resource with name: %s\n", name);
291
292 mlog_exit_void();
293}
294
34af946a 295static DEFINE_SPINLOCK(ocfs2_dlm_tracking_lock);
ccd979bd
MF		 296
297static void ocfs2_add_lockres_tracking(struct ocfs2_lock_res *res,
298 struct ocfs2_dlm_debug *dlm_debug)
299{
300 mlog(0, "Add tracking for lockres %s\n", res->l_name);
301
302 spin_lock(&ocfs2_dlm_tracking_lock);
303 list_add(&res->l_debug_list, &dlm_debug->d_lockres_tracking);
304 spin_unlock(&ocfs2_dlm_tracking_lock);
305}
306
307static void ocfs2_remove_lockres_tracking(struct ocfs2_lock_res *res)
308{
309 spin_lock(&ocfs2_dlm_tracking_lock);
310 if (!list_empty(&res->l_debug_list))
311 list_del_init(&res->l_debug_list);
312 spin_unlock(&ocfs2_dlm_tracking_lock);
313}
314
315static void ocfs2_lock_res_init_common(struct ocfs2_super *osb,
316 struct ocfs2_lock_res *res,
317 enum ocfs2_lock_type type,
ccd979bd
MF		 318 struct ocfs2_lock_res_ops *ops,
319 void *priv)
320{
ccd979bd
MF		 321 res->l_type = type;
322 res->l_ops = ops;
323 res->l_priv = priv;
324
325 res->l_level = LKM_IVMODE;
326 res->l_requested = LKM_IVMODE;
327 res->l_blocking = LKM_IVMODE;
328 res->l_action = OCFS2_AST_INVALID;
329 res->l_unlock_action = OCFS2_UNLOCK_INVALID;
330
331 res->l_flags = OCFS2_LOCK_INITIALIZED;
332
333 ocfs2_add_lockres_tracking(res, osb->osb_dlm_debug);
334}
335
336void ocfs2_lock_res_init_once(struct ocfs2_lock_res *res)
337{
338 /* This also clears out the lock status block */
339 memset(res, 0, sizeof(struct ocfs2_lock_res));
340 spin_lock_init(&res->l_lock);
341 init_waitqueue_head(&res->l_event);
342 INIT_LIST_HEAD(&res->l_blocked_list);
343 INIT_LIST_HEAD(&res->l_mask_waiters);
344}
345
346void ocfs2_inode_lock_res_init(struct ocfs2_lock_res *res,
347 enum ocfs2_lock_type type,
24c19ef4 348 unsigned int generation,
ccd979bd
MF		 349 struct inode *inode)
350{
351 struct ocfs2_lock_res_ops *ops;
352
353 switch(type) {
354 case OCFS2_LOCK_TYPE_RW:
355 ops = &ocfs2_inode_rw_lops;
356 break;
357 case OCFS2_LOCK_TYPE_META:
358 ops = &ocfs2_inode_meta_lops;
359 break;
360 case OCFS2_LOCK_TYPE_DATA:
361 ops = &ocfs2_inode_data_lops;
362 break;
363 default:
364 mlog_bug_on_msg(1, "type: %d\n", type);
365 ops = NULL; /* thanks, gcc */
366 break;
367 };
368
d680efe9 369 ocfs2_build_lock_name(type, OCFS2_I(inode)->ip_blkno,
24c19ef4 370 generation, res->l_name);
d680efe9
MF		 371 ocfs2_lock_res_init_common(OCFS2_SB(inode->i_sb), res, type, ops, inode);
372}
373
54a7e755
MF		 374static struct ocfs2_super *ocfs2_get_inode_osb(struct ocfs2_lock_res *lockres)
375{
376 struct inode *inode = ocfs2_lock_res_inode(lockres);
377
378 return OCFS2_SB(inode->i_sb);
379}
380
d680efe9
MF		 381static __u64 ocfs2_get_dentry_lock_ino(struct ocfs2_lock_res *lockres)
382{
383 __be64 inode_blkno_be;
384
385 memcpy(&inode_blkno_be, &lockres->l_name[OCFS2_DENTRY_LOCK_INO_START],
386 sizeof(__be64));
387
388 return be64_to_cpu(inode_blkno_be);
389}
390
54a7e755
MF		 391static struct ocfs2_super *ocfs2_get_dentry_osb(struct ocfs2_lock_res *lockres)
392{
393 struct ocfs2_dentry_lock *dl = lockres->l_priv;
394
395 return OCFS2_SB(dl->dl_inode->i_sb);
396}
397
d680efe9
MF		 398void ocfs2_dentry_lock_res_init(struct ocfs2_dentry_lock *dl,
399 u64 parent, struct inode *inode)
400{
401 int len;
402 u64 inode_blkno = OCFS2_I(inode)->ip_blkno;
403 __be64 inode_blkno_be = cpu_to_be64(inode_blkno);
404 struct ocfs2_lock_res *lockres = &dl->dl_lockres;
405
406 ocfs2_lock_res_init_once(lockres);
407
408 /*
409 * Unfortunately, the standard lock naming scheme won't work
410 * here because we have two 16 byte values to use. Instead,
411 * we'll stuff the inode number as a binary value. We still
412 * want error prints to show something without garbling the
413 * display, so drop a null byte in there before the inode
414 * number. A future version of OCFS2 will likely use all
415 * binary lock names. The stringified names have been a
416 * tremendous aid in debugging, but now that the debugfs
417 * interface exists, we can mangle things there if need be.
418 *
419 * NOTE: We also drop the standard "pad" value (the total lock
420 * name size stays the same though - the last part is all
421 * zeros due to the memset in ocfs2_lock_res_init_once()
422 */
423 len = snprintf(lockres->l_name, OCFS2_DENTRY_LOCK_INO_START,
424 "%c%016llx",
425 ocfs2_lock_type_char(OCFS2_LOCK_TYPE_DENTRY),
426 (long long)parent);
427
428 BUG_ON(len != (OCFS2_DENTRY_LOCK_INO_START - 1));
429
430 memcpy(&lockres->l_name[OCFS2_DENTRY_LOCK_INO_START], &inode_blkno_be,
431 sizeof(__be64));
432
433 ocfs2_lock_res_init_common(OCFS2_SB(inode->i_sb), lockres,
434 OCFS2_LOCK_TYPE_DENTRY, &ocfs2_dentry_lops,
435 dl);
ccd979bd
MF		 436}
437
438static void ocfs2_super_lock_res_init(struct ocfs2_lock_res *res,
439 struct ocfs2_super *osb)
440{
441 /* Superblock lockres doesn't come from a slab so we call init
442 * once on it manually. */
443 ocfs2_lock_res_init_once(res);
d680efe9
MF		 444 ocfs2_build_lock_name(OCFS2_LOCK_TYPE_SUPER, OCFS2_SUPER_BLOCK_BLKNO,
445 0, res->l_name);
ccd979bd 446 ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_SUPER,
ccd979bd
MF		 447 &ocfs2_super_lops, osb);
448}
449
450static void ocfs2_rename_lock_res_init(struct ocfs2_lock_res *res,
451 struct ocfs2_super *osb)
452{
453 /* Rename lockres doesn't come from a slab so we call init
454 * once on it manually. */
455 ocfs2_lock_res_init_once(res);
d680efe9
MF		 456 ocfs2_build_lock_name(OCFS2_LOCK_TYPE_RENAME, 0, 0, res->l_name);
457 ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_RENAME,
ccd979bd
MF		 458 &ocfs2_rename_lops, osb);
459}
460
461void ocfs2_lock_res_free(struct ocfs2_lock_res *res)
462{
463 mlog_entry_void();
464
465 if (!(res->l_flags & OCFS2_LOCK_INITIALIZED))
466 return;
467
468 ocfs2_remove_lockres_tracking(res);
469
470 mlog_bug_on_msg(!list_empty(&res->l_blocked_list),
471 "Lockres %s is on the blocked list\n",
472 res->l_name);
473 mlog_bug_on_msg(!list_empty(&res->l_mask_waiters),
474 "Lockres %s has mask waiters pending\n",
475 res->l_name);
476 mlog_bug_on_msg(spin_is_locked(&res->l_lock),
477 "Lockres %s is locked\n",
478 res->l_name);
479 mlog_bug_on_msg(res->l_ro_holders,
480 "Lockres %s has %u ro holders\n",
481 res->l_name, res->l_ro_holders);
482 mlog_bug_on_msg(res->l_ex_holders,
483 "Lockres %s has %u ex holders\n",
484 res->l_name, res->l_ex_holders);
485
486 /* Need to clear out the lock status block for the dlm */
487 memset(&res->l_lksb, 0, sizeof(res->l_lksb));
488
489 res->l_flags = 0UL;
490 mlog_exit_void();
491}
492
493static inline void ocfs2_inc_holders(struct ocfs2_lock_res *lockres,
494 int level)
495{
496 mlog_entry_void();
497
498 BUG_ON(!lockres);
499
500 switch(level) {
501 case LKM_EXMODE:
502 lockres->l_ex_holders++;
503 break;
504 case LKM_PRMODE:
505 lockres->l_ro_holders++;
506 break;
507 default:
508 BUG();
509 }
510
511 mlog_exit_void();
512}
513
514static inline void ocfs2_dec_holders(struct ocfs2_lock_res *lockres,
515 int level)
516{
517 mlog_entry_void();
518
519 BUG_ON(!lockres);
520
521 switch(level) {
522 case LKM_EXMODE:
523 BUG_ON(!lockres->l_ex_holders);
524 lockres->l_ex_holders--;
525 break;
526 case LKM_PRMODE:
527 BUG_ON(!lockres->l_ro_holders);
528 lockres->l_ro_holders--;
529 break;
530 default:
531 BUG();
532 }
533 mlog_exit_void();
534}
535
536/* WARNING: This function lives in a world where the only three lock
537 * levels are EX, PR, and NL. It *will* have to be adjusted when more
538 * lock types are added. */
539static inline int ocfs2_highest_compat_lock_level(int level)
540{
541 int new_level = LKM_EXMODE;
542
543 if (level == LKM_EXMODE)
544 new_level = LKM_NLMODE;
545 else if (level == LKM_PRMODE)
546 new_level = LKM_PRMODE;
547 return new_level;
548}
549
550static void lockres_set_flags(struct ocfs2_lock_res *lockres,
551 unsigned long newflags)
552{
553 struct list_head *pos, *tmp;
554 struct ocfs2_mask_waiter *mw;
555
556 assert_spin_locked(&lockres->l_lock);
557
558 lockres->l_flags = newflags;
559
560 list_for_each_safe(pos, tmp, &lockres->l_mask_waiters) {
561 mw = list_entry(pos, struct ocfs2_mask_waiter, mw_item);
562 if ((lockres->l_flags & mw->mw_mask) != mw->mw_goal)
563 continue;
564
565 list_del_init(&mw->mw_item);
566 mw->mw_status = 0;
567 complete(&mw->mw_complete);
568 }
569}
570static void lockres_or_flags(struct ocfs2_lock_res *lockres, unsigned long or)
571{
572 lockres_set_flags(lockres, lockres->l_flags | or);
573}
574static void lockres_clear_flags(struct ocfs2_lock_res *lockres,
575 unsigned long clear)
576{
577 lockres_set_flags(lockres, lockres->l_flags & ~clear);
578}
579
580static inline void ocfs2_generic_handle_downconvert_action(struct ocfs2_lock_res *lockres)
581{
582 mlog_entry_void();
583
584 BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY));
585 BUG_ON(!(lockres->l_flags & OCFS2_LOCK_ATTACHED));
586 BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED));
587 BUG_ON(lockres->l_blocking <= LKM_NLMODE);
588
589 lockres->l_level = lockres->l_requested;
590 if (lockres->l_level <=
591 ocfs2_highest_compat_lock_level(lockres->l_blocking)) {
592 lockres->l_blocking = LKM_NLMODE;
593 lockres_clear_flags(lockres, OCFS2_LOCK_BLOCKED);
594 }
595 lockres_clear_flags(lockres, OCFS2_LOCK_BUSY);
596
597 mlog_exit_void();
598}
599
600static inline void ocfs2_generic_handle_convert_action(struct ocfs2_lock_res *lockres)
601{
602 mlog_entry_void();
603
604 BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY));
605 BUG_ON(!(lockres->l_flags & OCFS2_LOCK_ATTACHED));
606
607 /* Convert from RO to EX doesn't really need anything as our
608 * information is already up to data. Convert from NL to
609 * *anything* however should mark ourselves as needing an
610 * update */
f625c979
MF		 611 if (lockres->l_level == LKM_NLMODE &&
612 lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH)
ccd979bd
MF		 613 lockres_or_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH);
614
615 lockres->l_level = lockres->l_requested;
616 lockres_clear_flags(lockres, OCFS2_LOCK_BUSY);
617
618 mlog_exit_void();
619}
620
621static inline void ocfs2_generic_handle_attach_action(struct ocfs2_lock_res *lockres)
622{
623 mlog_entry_void();
624
625 BUG_ON((!lockres->l_flags & OCFS2_LOCK_BUSY));
626 BUG_ON(lockres->l_flags & OCFS2_LOCK_ATTACHED);
627
628 if (lockres->l_requested > LKM_NLMODE &&
f625c979
MF		 629 !(lockres->l_flags & OCFS2_LOCK_LOCAL) &&
630 lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH)
ccd979bd
MF		 631 lockres_or_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH);
632
633 lockres->l_level = lockres->l_requested;
634 lockres_or_flags(lockres, OCFS2_LOCK_ATTACHED);
635 lockres_clear_flags(lockres, OCFS2_LOCK_BUSY);
636
637 mlog_exit_void();
638}
639
ccd979bd
MF		 640static int ocfs2_generic_handle_bast(struct ocfs2_lock_res *lockres,
641 int level)
642{
643 int needs_downconvert = 0;
644 mlog_entry_void();
645
646 assert_spin_locked(&lockres->l_lock);
647
648 lockres_or_flags(lockres, OCFS2_LOCK_BLOCKED);
649
650 if (level > lockres->l_blocking) {
651 /* only schedule a downconvert if we haven't already scheduled
652 * one that goes low enough to satisfy the level we're
653 * blocking. this also catches the case where we get
654 * duplicate BASTs */
655 if (ocfs2_highest_compat_lock_level(level) <
656 ocfs2_highest_compat_lock_level(lockres->l_blocking))
657 needs_downconvert = 1;
658
659 lockres->l_blocking = level;
660 }
661
662 mlog_exit(needs_downconvert);
663 return needs_downconvert;
664}
665
666static void ocfs2_generic_bast_func(struct ocfs2_super *osb,
667 struct ocfs2_lock_res *lockres,
668 int level)
669{
670 int needs_downconvert;
671 unsigned long flags;
672
673 mlog_entry_void();
674
675 BUG_ON(level <= LKM_NLMODE);
676
677 spin_lock_irqsave(&lockres->l_lock, flags);
678 needs_downconvert = ocfs2_generic_handle_bast(lockres, level);
679 if (needs_downconvert)
680 ocfs2_schedule_blocked_lock(osb, lockres);
681 spin_unlock_irqrestore(&lockres->l_lock, flags);
682
d680efe9
MF		 683 wake_up(&lockres->l_event);
684
ccd979bd
MF		 685 ocfs2_kick_vote_thread(osb);
686
ccd979bd
MF		 687 mlog_exit_void();
688}
689
690static void ocfs2_inode_bast_func(void *opaque, int level)
691{
692 struct ocfs2_lock_res *lockres = opaque;
693 struct inode *inode;
694 struct ocfs2_super *osb;
695
696 mlog_entry_void();
697
698 BUG_ON(!ocfs2_is_inode_lock(lockres));
699
700 inode = ocfs2_lock_res_inode(lockres);
701 osb = OCFS2_SB(inode->i_sb);
702
b0697053
MF		 703 mlog(0, "BAST fired for inode %llu, blocking %d, level %d type %s\n",
704 (unsigned long long)OCFS2_I(inode)->ip_blkno, level,
705 lockres->l_level, ocfs2_lock_type_string(lockres->l_type));
ccd979bd
MF		 706
707 ocfs2_generic_bast_func(osb, lockres, level);
708
709 mlog_exit_void();
710}
711
e92d57df 712static void ocfs2_locking_ast(void *opaque)
ccd979bd 713{
e92d57df 714 struct ocfs2_lock_res *lockres = opaque;
ccd979bd
MF		 715 struct dlm_lockstatus *lksb = &lockres->l_lksb;
716 unsigned long flags;
717
718 spin_lock_irqsave(&lockres->l_lock, flags);
719
720 if (lksb->status != DLM_NORMAL) {
721 mlog(ML_ERROR, "lockres %s: lksb status value of %u!\n",
722 lockres->l_name, lksb->status);
723 spin_unlock_irqrestore(&lockres->l_lock, flags);
724 return;
725 }
726
727 switch(lockres->l_action) {
728 case OCFS2_AST_ATTACH:
729 ocfs2_generic_handle_attach_action(lockres);
e92d57df 730 lockres_clear_flags(lockres, OCFS2_LOCK_LOCAL);
ccd979bd
MF		 731 break;
732 case OCFS2_AST_CONVERT:
733 ocfs2_generic_handle_convert_action(lockres);
734 break;
735 case OCFS2_AST_DOWNCONVERT:
736 ocfs2_generic_handle_downconvert_action(lockres);
737 break;
738 default:
e92d57df
MF		 739 mlog(ML_ERROR, "lockres %s: ast fired with invalid action: %u "
740 "lockres flags = 0x%lx, unlock action: %u\n",
741 lockres->l_name, lockres->l_action, lockres->l_flags,
742 lockres->l_unlock_action);
ccd979bd
MF		 743 BUG();
744 }
745
ccd979bd
MF		 746 /* set it to something invalid so if we get called again we
747 * can catch it. */
748 lockres->l_action = OCFS2_AST_INVALID;
ccd979bd
MF		 749
750 wake_up(&lockres->l_event);
d680efe9 751 spin_unlock_irqrestore(&lockres->l_lock, flags);
ccd979bd
MF		 752}
753
ccd979bd
MF		 754static void ocfs2_super_bast_func(void *opaque,
755 int level)
756{
757 struct ocfs2_lock_res *lockres = opaque;
758 struct ocfs2_super *osb;
759
760 mlog_entry_void();
761 mlog(0, "Superblock BAST fired\n");
762
763 BUG_ON(!ocfs2_is_super_lock(lockres));
764 osb = ocfs2_lock_res_super(lockres);
765 ocfs2_generic_bast_func(osb, lockres, level);
766
767 mlog_exit_void();
768}
769
ccd979bd
MF		 770static void ocfs2_rename_bast_func(void *opaque,
771 int level)
772{
773 struct ocfs2_lock_res *lockres = opaque;
774 struct ocfs2_super *osb;
775
776 mlog_entry_void();
777
778 mlog(0, "Rename BAST fired\n");
779
780 BUG_ON(!ocfs2_is_rename_lock(lockres));
781
782 osb = ocfs2_lock_res_super(lockres);
783 ocfs2_generic_bast_func(osb, lockres, level);
784
785 mlog_exit_void();
786}
787
d680efe9
MF		 788static void ocfs2_dentry_bast_func(void *opaque, int level)
789{
790 struct ocfs2_lock_res *lockres = opaque;
791 struct ocfs2_dentry_lock *dl = lockres->l_priv;
792 struct ocfs2_super *osb = OCFS2_SB(dl->dl_inode->i_sb);
793
794 mlog(0, "Dentry bast: level: %d, name: %s\n", level,
795 lockres->l_name);
796
797 ocfs2_generic_bast_func(osb, lockres, level);
798}
799
ccd979bd
MF		 800static inline void ocfs2_recover_from_dlm_error(struct ocfs2_lock_res *lockres,
801 int convert)
802{
803 unsigned long flags;
804
805 mlog_entry_void();
806 spin_lock_irqsave(&lockres->l_lock, flags);
807 lockres_clear_flags(lockres, OCFS2_LOCK_BUSY);
808 if (convert)
809 lockres->l_action = OCFS2_AST_INVALID;
810 else
811 lockres->l_unlock_action = OCFS2_UNLOCK_INVALID;
812 spin_unlock_irqrestore(&lockres->l_lock, flags);
813
814 wake_up(&lockres->l_event);
815 mlog_exit_void();
816}
817
818/* Note: If we detect another process working on the lock (i.e.,
819 * OCFS2_LOCK_BUSY), we'll bail out returning 0. It's up to the caller
820 * to do the right thing in that case.
821 */
822static int ocfs2_lock_create(struct ocfs2_super *osb,
823 struct ocfs2_lock_res *lockres,
824 int level,
825 int dlm_flags)
826{
827 int ret = 0;
828 enum dlm_status status;
829 unsigned long flags;
830
831 mlog_entry_void();
832
833 mlog(0, "lock %s, level = %d, flags = %d\n", lockres->l_name, level,
834 dlm_flags);
835
836 spin_lock_irqsave(&lockres->l_lock, flags);
837 if ((lockres->l_flags & OCFS2_LOCK_ATTACHED) ||
838 (lockres->l_flags & OCFS2_LOCK_BUSY)) {
839 spin_unlock_irqrestore(&lockres->l_lock, flags);
840 goto bail;
841 }
842
843 lockres->l_action = OCFS2_AST_ATTACH;
844 lockres->l_requested = level;
845 lockres_or_flags(lockres, OCFS2_LOCK_BUSY);
846 spin_unlock_irqrestore(&lockres->l_lock, flags);
847
848 status = dlmlock(osb->dlm,
849 level,
850 &lockres->l_lksb,
851 dlm_flags,
852 lockres->l_name,
f0681062 853 OCFS2_LOCK_ID_MAX_LEN - 1,
e92d57df 854 ocfs2_locking_ast,
ccd979bd
MF		 855 lockres,
856 lockres->l_ops->bast);
857 if (status != DLM_NORMAL) {
858 ocfs2_log_dlm_error("dlmlock", status, lockres);
859 ret = -EINVAL;
860 ocfs2_recover_from_dlm_error(lockres, 1);
861 }
862
863 mlog(0, "lock %s, successfull return from dlmlock\n", lockres->l_name);
864
865bail:
866 mlog_exit(ret);
867 return ret;
868}
869
870static inline int ocfs2_check_wait_flag(struct ocfs2_lock_res *lockres,
871 int flag)
872{
873 unsigned long flags;
874 int ret;
875
876 spin_lock_irqsave(&lockres->l_lock, flags);
877 ret = lockres->l_flags & flag;
878 spin_unlock_irqrestore(&lockres->l_lock, flags);
879
880 return ret;
881}
882
883static inline void ocfs2_wait_on_busy_lock(struct ocfs2_lock_res *lockres)
884
885{
886 wait_event(lockres->l_event,
887 !ocfs2_check_wait_flag(lockres, OCFS2_LOCK_BUSY));
888}
889
890static inline void ocfs2_wait_on_refreshing_lock(struct ocfs2_lock_res *lockres)
891
892{
893 wait_event(lockres->l_event,
894 !ocfs2_check_wait_flag(lockres, OCFS2_LOCK_REFRESHING));
895}
896
897/* predict what lock level we'll be dropping down to on behalf
898 * of another node, and return true if the currently wanted
899 * level will be compatible with it. */
900static inline int ocfs2_may_continue_on_blocked_lock(struct ocfs2_lock_res *lockres,
901 int wanted)
902{
903 BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED));
904
905 return wanted <= ocfs2_highest_compat_lock_level(lockres->l_blocking);
906}
907
908static void ocfs2_init_mask_waiter(struct ocfs2_mask_waiter *mw)
909{
910 INIT_LIST_HEAD(&mw->mw_item);
911 init_completion(&mw->mw_complete);
912}
913
914static int ocfs2_wait_for_mask(struct ocfs2_mask_waiter *mw)
915{
916 wait_for_completion(&mw->mw_complete);
917 /* Re-arm the completion in case we want to wait on it again */
918 INIT_COMPLETION(mw->mw_complete);
919 return mw->mw_status;
920}
921
922static void lockres_add_mask_waiter(struct ocfs2_lock_res *lockres,
923 struct ocfs2_mask_waiter *mw,
924 unsigned long mask,
925 unsigned long goal)
926{
927 BUG_ON(!list_empty(&mw->mw_item));
928
929 assert_spin_locked(&lockres->l_lock);
930
931 list_add_tail(&mw->mw_item, &lockres->l_mask_waiters);
932 mw->mw_mask = mask;
933 mw->mw_goal = goal;
934}
935
936/* returns 0 if the mw that was removed was already satisfied, -EBUSY
937 * if the mask still hadn't reached its goal */
938static int lockres_remove_mask_waiter(struct ocfs2_lock_res *lockres,
939 struct ocfs2_mask_waiter *mw)
940{
941 unsigned long flags;
942 int ret = 0;
943
944 spin_lock_irqsave(&lockres->l_lock, flags);
945 if (!list_empty(&mw->mw_item)) {
946 if ((lockres->l_flags & mw->mw_mask) != mw->mw_goal)
947 ret = -EBUSY;
948
949 list_del_init(&mw->mw_item);
950 init_completion(&mw->mw_complete);
951 }
952 spin_unlock_irqrestore(&lockres->l_lock, flags);
953
954 return ret;
955
956}
957
958static int ocfs2_cluster_lock(struct ocfs2_super *osb,
959 struct ocfs2_lock_res *lockres,
960 int level,
961 int lkm_flags,
962 int arg_flags)
963{
964 struct ocfs2_mask_waiter mw;
965 enum dlm_status status;
966 int wait, catch_signals = !(osb->s_mount_opt & OCFS2_MOUNT_NOINTR);
967 int ret = 0; /* gcc doesn't realize wait = 1 guarantees ret is set */
968 unsigned long flags;
969
970 mlog_entry_void();
971
972 ocfs2_init_mask_waiter(&mw);
973
974again:
975 wait = 0;
976
977 if (catch_signals && signal_pending(current)) {
978 ret = -ERESTARTSYS;
979 goto out;
980 }
981
982 spin_lock_irqsave(&lockres->l_lock, flags);
983
984 mlog_bug_on_msg(lockres->l_flags & OCFS2_LOCK_FREEING,
985 "Cluster lock called on freeing lockres %s! flags "
986 "0x%lx\n", lockres->l_name, lockres->l_flags);
987
988 /* We only compare against the currently granted level
989 * here. If the lock is blocked waiting on a downconvert,
990 * we'll get caught below. */
991 if (lockres->l_flags & OCFS2_LOCK_BUSY &&
992 level > lockres->l_level) {
993 /* is someone sitting in dlm_lock? If so, wait on
994 * them. */
995 lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0);
996 wait = 1;
997 goto unlock;
998 }
999
1000 if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) {
1001 /* lock has not been created yet. */
1002 spin_unlock_irqrestore(&lockres->l_lock, flags);
1003
1004 ret = ocfs2_lock_create(osb, lockres, LKM_NLMODE, 0);
1005 if (ret < 0) {
1006 mlog_errno(ret);
1007 goto out;
1008 }
1009 goto again;
1010 }
1011
1012 if (lockres->l_flags & OCFS2_LOCK_BLOCKED &&
1013 !ocfs2_may_continue_on_blocked_lock(lockres, level)) {
1014 /* is the lock is currently blocked on behalf of
1015 * another node */
1016 lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BLOCKED, 0);
1017 wait = 1;
1018 goto unlock;
1019 }
1020
1021 if (level > lockres->l_level) {
1022 if (lockres->l_action != OCFS2_AST_INVALID)
1023 mlog(ML_ERROR, "lockres %s has action %u pending\n",
1024 lockres->l_name, lockres->l_action);
1025
1026 lockres->l_action = OCFS2_AST_CONVERT;
1027 lockres->l_requested = level;
1028 lockres_or_flags(lockres, OCFS2_LOCK_BUSY);
1029 spin_unlock_irqrestore(&lockres->l_lock, flags);
1030
1031 BUG_ON(level == LKM_IVMODE);
1032 BUG_ON(level == LKM_NLMODE);
1033
1034 mlog(0, "lock %s, convert from %d to level = %d\n",
1035 lockres->l_name, lockres->l_level, level);
1036
1037 /* call dlm_lock to upgrade lock now */
1038 status = dlmlock(osb->dlm,
1039 level,
1040 &lockres->l_lksb,
1041 lkm_flags|LKM_CONVERT|LKM_VALBLK,
1042 lockres->l_name,
f0681062 1043 OCFS2_LOCK_ID_MAX_LEN - 1,
e92d57df 1044 ocfs2_locking_ast,
ccd979bd
MF		 1045 lockres,
1046 lockres->l_ops->bast);
1047 if (status != DLM_NORMAL) {
1048 if ((lkm_flags & LKM_NOQUEUE) &&
1049 (status == DLM_NOTQUEUED))
1050 ret = -EAGAIN;
1051 else {
1052 ocfs2_log_dlm_error("dlmlock", status,
1053 lockres);
1054 ret = -EINVAL;
1055 }
1056 ocfs2_recover_from_dlm_error(lockres, 1);
1057 goto out;
1058 }
1059
1060 mlog(0, "lock %s, successfull return from dlmlock\n",
1061 lockres->l_name);
1062
1063 /* At this point we've gone inside the dlm and need to
1064 * complete our work regardless. */
1065 catch_signals = 0;
1066
1067 /* wait for busy to clear and carry on */
1068 goto again;
1069 }
1070
1071 /* Ok, if we get here then we're good to go. */
1072 ocfs2_inc_holders(lockres, level);
1073
1074 ret = 0;
1075unlock:
1076 spin_unlock_irqrestore(&lockres->l_lock, flags);
1077out:
1078 /*
1079 * This is helping work around a lock inversion between the page lock
1080 * and dlm locks. One path holds the page lock while calling aops
1081 * which block acquiring dlm locks. The voting thread holds dlm
1082 * locks while acquiring page locks while down converting data locks.
1083 * This block is helping an aop path notice the inversion and back
1084 * off to unlock its page lock before trying the dlm lock again.
1085 */
1086 if (wait && arg_flags & OCFS2_LOCK_NONBLOCK &&
1087 mw.mw_mask & (OCFS2_LOCK_BUSY|OCFS2_LOCK_BLOCKED)) {
1088 wait = 0;
1089 if (lockres_remove_mask_waiter(lockres, &mw))
1090 ret = -EAGAIN;
1091 else
1092 goto again;
1093 }
1094 if (wait) {
1095 ret = ocfs2_wait_for_mask(&mw);
1096 if (ret == 0)
1097 goto again;
1098 mlog_errno(ret);
1099 }
1100
1101 mlog_exit(ret);
1102 return ret;
1103}
1104
1105static void ocfs2_cluster_unlock(struct ocfs2_super *osb,
1106 struct ocfs2_lock_res *lockres,
1107 int level)
1108{
1109 unsigned long flags;
1110
1111 mlog_entry_void();
1112 spin_lock_irqsave(&lockres->l_lock, flags);
1113 ocfs2_dec_holders(lockres, level);
1114 ocfs2_vote_on_unlock(osb, lockres);
1115 spin_unlock_irqrestore(&lockres->l_lock, flags);
1116 mlog_exit_void();
1117}
1118
d680efe9
MF		 1119int ocfs2_create_new_lock(struct ocfs2_super *osb,
1120 struct ocfs2_lock_res *lockres,
24c19ef4
MF		 1121 int ex,
1122 int local)
ccd979bd 1123{
d680efe9 1124 int level = ex ? LKM_EXMODE : LKM_PRMODE;
ccd979bd 1125 unsigned long flags;
24c19ef4 1126 int lkm_flags = local ? LKM_LOCAL : 0;
ccd979bd
MF		 1127
1128 spin_lock_irqsave(&lockres->l_lock, flags);
1129 BUG_ON(lockres->l_flags & OCFS2_LOCK_ATTACHED);
1130 lockres_or_flags(lockres, OCFS2_LOCK_LOCAL);
1131 spin_unlock_irqrestore(&lockres->l_lock, flags);
1132
24c19ef4 1133 return ocfs2_lock_create(osb, lockres, level, lkm_flags);
ccd979bd
MF		 1134}
1135
1136/* Grants us an EX lock on the data and metadata resources, skipping
1137 * the normal cluster directory lookup. Use this ONLY on newly created
1138 * inodes which other nodes can't possibly see, and which haven't been
1139 * hashed in the inode hash yet. This can give us a good performance
1140 * increase as it'll skip the network broadcast normally associated
1141 * with creating a new lock resource. */
1142int ocfs2_create_new_inode_locks(struct inode *inode)
1143{
1144 int ret;
d680efe9 1145 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
ccd979bd
MF		 1146
1147 BUG_ON(!inode);
1148 BUG_ON(!ocfs2_inode_is_new(inode));
1149
1150 mlog_entry_void();
1151
b0697053 1152 mlog(0, "Inode %llu\n", (unsigned long long)OCFS2_I(inode)->ip_blkno);
ccd979bd
MF		 1153
1154 /* NOTE: That we don't increment any of the holder counts, nor
1155 * do we add anything to a journal handle. Since this is
1156 * supposed to be a new inode which the cluster doesn't know
1157 * about yet, there is no need to. As far as the LVB handling
1158 * is concerned, this is basically like acquiring an EX lock
1159 * on a resource which has an invalid one -- we'll set it
1160 * valid when we release the EX. */
1161
24c19ef4 1162 ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_rw_lockres, 1, 1);
ccd979bd
MF		 1163 if (ret) {
1164 mlog_errno(ret);
1165 goto bail;
1166 }
1167
24c19ef4
MF		 1168 /*
1169 * We don't want to use LKM_LOCAL on a meta data lock as they
1170 * don't use a generation in their lock names.
1171 */
1172 ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_meta_lockres, 1, 0);
ccd979bd
MF		 1173 if (ret) {
1174 mlog_errno(ret);
1175 goto bail;
1176 }
1177
24c19ef4 1178 ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_data_lockres, 1, 1);
ccd979bd
MF		 1179 if (ret) {
1180 mlog_errno(ret);
1181 goto bail;
1182 }
1183
1184bail:
1185 mlog_exit(ret);
1186 return ret;
1187}
1188
1189int ocfs2_rw_lock(struct inode *inode, int write)
1190{
1191 int status, level;
1192 struct ocfs2_lock_res *lockres;
1193
1194 BUG_ON(!inode);
1195
1196 mlog_entry_void();
1197
b0697053
MF		 1198 mlog(0, "inode %llu take %s RW lock\n",
1199 (unsigned long long)OCFS2_I(inode)->ip_blkno,
ccd979bd
MF		 1200 write ? "EXMODE" : "PRMODE");
1201
1202 lockres = &OCFS2_I(inode)->ip_rw_lockres;
1203
1204 level = write ? LKM_EXMODE : LKM_PRMODE;
1205
1206 status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres, level, 0,
1207 0);
1208 if (status < 0)
1209 mlog_errno(status);
1210
1211 mlog_exit(status);
1212 return status;
1213}
1214
1215void ocfs2_rw_unlock(struct inode *inode, int write)
1216{
1217 int level = write ? LKM_EXMODE : LKM_PRMODE;
1218 struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_rw_lockres;
1219
1220 mlog_entry_void();
1221
b0697053
MF		 1222 mlog(0, "inode %llu drop %s RW lock\n",
1223 (unsigned long long)OCFS2_I(inode)->ip_blkno,
ccd979bd
MF		 1224 write ? "EXMODE" : "PRMODE");
1225
1226 ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level);
1227
1228 mlog_exit_void();
1229}
1230
1231int ocfs2_data_lock_full(struct inode *inode,
1232 int write,
1233 int arg_flags)
1234{
1235 int status = 0, level;
1236 struct ocfs2_lock_res *lockres;
1237
1238 BUG_ON(!inode);
1239
1240 mlog_entry_void();
1241
b0697053
MF		 1242 mlog(0, "inode %llu take %s DATA lock\n",
1243 (unsigned long long)OCFS2_I(inode)->ip_blkno,
ccd979bd
MF		 1244 write ? "EXMODE" : "PRMODE");
1245
1246 /* We'll allow faking a readonly data lock for
1247 * rodevices. */
1248 if (ocfs2_is_hard_readonly(OCFS2_SB(inode->i_sb))) {
1249 if (write) {
1250 status = -EROFS;
1251 mlog_errno(status);
1252 }
1253 goto out;
1254 }
1255
1256 lockres = &OCFS2_I(inode)->ip_data_lockres;
1257
1258 level = write ? LKM_EXMODE : LKM_PRMODE;
1259
1260 status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres, level,
1261 0, arg_flags);
1262 if (status < 0 && status != -EAGAIN)
1263 mlog_errno(status);
1264
1265out:
1266 mlog_exit(status);
1267 return status;
1268}
1269
1270/* see ocfs2_meta_lock_with_page() */
1271int ocfs2_data_lock_with_page(struct inode *inode,
1272 int write,
1273 struct page *page)
1274{
1275 int ret;
1276
1277 ret = ocfs2_data_lock_full(inode, write, OCFS2_LOCK_NONBLOCK);
1278 if (ret == -EAGAIN) {
1279 unlock_page(page);
1280 if (ocfs2_data_lock(inode, write) == 0)
1281 ocfs2_data_unlock(inode, write);
1282 ret = AOP_TRUNCATED_PAGE;
1283 }
1284
1285 return ret;
1286}
1287
1288static void ocfs2_vote_on_unlock(struct ocfs2_super *osb,
1289 struct ocfs2_lock_res *lockres)
1290{
1291 int kick = 0;
1292
1293 mlog_entry_void();
1294
1295 /* If we know that another node is waiting on our lock, kick
1296 * the vote thread * pre-emptively when we reach a release
1297 * condition. */
1298 if (lockres->l_flags & OCFS2_LOCK_BLOCKED) {
1299 switch(lockres->l_blocking) {
1300 case LKM_EXMODE:
1301 if (!lockres->l_ex_holders && !lockres->l_ro_holders)
1302 kick = 1;
1303 break;
1304 case LKM_PRMODE:
1305 if (!lockres->l_ex_holders)
1306 kick = 1;
1307 break;
1308 default:
1309 BUG();
1310 }
1311 }
1312
1313 if (kick)
1314 ocfs2_kick_vote_thread(osb);
1315
1316 mlog_exit_void();
1317}
1318
1319void ocfs2_data_unlock(struct inode *inode,
1320 int write)
1321{
1322 int level = write ? LKM_EXMODE : LKM_PRMODE;
1323 struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_data_lockres;
1324
1325 mlog_entry_void();
1326
b0697053
MF		 1327 mlog(0, "inode %llu drop %s DATA lock\n",
1328 (unsigned long long)OCFS2_I(inode)->ip_blkno,
ccd979bd
MF		 1329 write ? "EXMODE" : "PRMODE");
1330
1331 if (!ocfs2_is_hard_readonly(OCFS2_SB(inode->i_sb)))
1332 ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level);
1333
1334 mlog_exit_void();
1335}
1336
1337#define OCFS2_SEC_BITS 34
1338#define OCFS2_SEC_SHIFT (64 - 34)
1339#define OCFS2_NSEC_MASK ((1ULL << OCFS2_SEC_SHIFT) - 1)
1340
1341/* LVB only has room for 64 bits of time here so we pack it for
1342 * now. */
1343static u64 ocfs2_pack_timespec(struct timespec *spec)
1344{
1345 u64 res;
1346 u64 sec = spec->tv_sec;
1347 u32 nsec = spec->tv_nsec;
1348
1349 res = (sec << OCFS2_SEC_SHIFT) | (nsec & OCFS2_NSEC_MASK);
1350
1351 return res;
1352}
1353
1354/* Call this with the lockres locked. I am reasonably sure we don't
1355 * need ip_lock in this function as anyone who would be changing those
1356 * values is supposed to be blocked in ocfs2_meta_lock right now. */
1357static void __ocfs2_stuff_meta_lvb(struct inode *inode)
1358{
1359 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1360 struct ocfs2_lock_res *lockres = &oi->ip_meta_lockres;
1361 struct ocfs2_meta_lvb *lvb;
1362
1363 mlog_entry_void();
1364
1365 lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb;
1366
24c19ef4
MF		 1367 /*
1368 * Invalidate the LVB of a deleted inode - this way other
1369 * nodes are forced to go to disk and discover the new inode
1370 * status.
1371 */
1372 if (oi->ip_flags & OCFS2_INODE_DELETED) {
1373 lvb->lvb_version = 0;
1374 goto out;
1375 }
1376
4d3b83f7 1377 lvb->lvb_version = OCFS2_LVB_VERSION;
ccd979bd
MF		 1378 lvb->lvb_isize = cpu_to_be64(i_size_read(inode));
1379 lvb->lvb_iclusters = cpu_to_be32(oi->ip_clusters);
1380 lvb->lvb_iuid = cpu_to_be32(inode->i_uid);
1381 lvb->lvb_igid = cpu_to_be32(inode->i_gid);
1382 lvb->lvb_imode = cpu_to_be16(inode->i_mode);
1383 lvb->lvb_inlink = cpu_to_be16(inode->i_nlink);
1384 lvb->lvb_iatime_packed =
1385 cpu_to_be64(ocfs2_pack_timespec(&inode->i_atime));
1386 lvb->lvb_ictime_packed =
1387 cpu_to_be64(ocfs2_pack_timespec(&inode->i_ctime));
1388 lvb->lvb_imtime_packed =
1389 cpu_to_be64(ocfs2_pack_timespec(&inode->i_mtime));
ca4d147e 1390 lvb->lvb_iattr = cpu_to_be32(oi->ip_attr);
f9e2d82e 1391 lvb->lvb_igeneration = cpu_to_be32(inode->i_generation);
ccd979bd 1392
24c19ef4 1393out:
ccd979bd
MF		 1394 mlog_meta_lvb(0, lockres);
1395
1396 mlog_exit_void();
1397}
1398
1399static void ocfs2_unpack_timespec(struct timespec *spec,
1400 u64 packed_time)
1401{
1402 spec->tv_sec = packed_time >> OCFS2_SEC_SHIFT;
1403 spec->tv_nsec = packed_time & OCFS2_NSEC_MASK;
1404}
1405
1406static void ocfs2_refresh_inode_from_lvb(struct inode *inode)
1407{
1408 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1409 struct ocfs2_lock_res *lockres = &oi->ip_meta_lockres;
1410 struct ocfs2_meta_lvb *lvb;
1411
1412 mlog_entry_void();
1413
1414 mlog_meta_lvb(0, lockres);
1415
1416 lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb;
1417
1418 /* We're safe here without the lockres lock... */
1419 spin_lock(&oi->ip_lock);
1420 oi->ip_clusters = be32_to_cpu(lvb->lvb_iclusters);
1421 i_size_write(inode, be64_to_cpu(lvb->lvb_isize));
1422
ca4d147e
HP		 1423 oi->ip_attr = be32_to_cpu(lvb->lvb_iattr);
1424 ocfs2_set_inode_flags(inode);
1425
ccd979bd
MF		 1426 /* fast-symlinks are a special case */
1427 if (S_ISLNK(inode->i_mode) && !oi->ip_clusters)
1428 inode->i_blocks = 0;
1429 else
1430 inode->i_blocks =
1431 ocfs2_align_bytes_to_sectors(i_size_read(inode));
1432
1433 inode->i_uid = be32_to_cpu(lvb->lvb_iuid);
1434 inode->i_gid = be32_to_cpu(lvb->lvb_igid);
1435 inode->i_mode = be16_to_cpu(lvb->lvb_imode);
1436 inode->i_nlink = be16_to_cpu(lvb->lvb_inlink);
1437 ocfs2_unpack_timespec(&inode->i_atime,
1438 be64_to_cpu(lvb->lvb_iatime_packed));
1439 ocfs2_unpack_timespec(&inode->i_mtime,
1440 be64_to_cpu(lvb->lvb_imtime_packed));
1441 ocfs2_unpack_timespec(&inode->i_ctime,
1442 be64_to_cpu(lvb->lvb_ictime_packed));
1443 spin_unlock(&oi->ip_lock);
1444
1445 mlog_exit_void();
1446}
1447
f9e2d82e
MF		 1448static inline int ocfs2_meta_lvb_is_trustable(struct inode *inode,
1449 struct ocfs2_lock_res *lockres)
ccd979bd
MF		 1450{
1451 struct ocfs2_meta_lvb *lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb;
1452
f9e2d82e
MF		 1453 if (lvb->lvb_version == OCFS2_LVB_VERSION
1454 && be32_to_cpu(lvb->lvb_igeneration) == inode->i_generation)
ccd979bd
MF		 1455 return 1;
1456 return 0;
1457}
1458
1459/* Determine whether a lock resource needs to be refreshed, and
1460 * arbitrate who gets to refresh it.
1461 *
1462 * 0 means no refresh needed.
1463 *
1464 * > 0 means you need to refresh this and you MUST call
1465 * ocfs2_complete_lock_res_refresh afterwards. */
1466static int ocfs2_should_refresh_lock_res(struct ocfs2_lock_res *lockres)
1467{
1468 unsigned long flags;
1469 int status = 0;
1470
1471 mlog_entry_void();
1472
1473refresh_check:
1474 spin_lock_irqsave(&lockres->l_lock, flags);
1475 if (!(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) {
1476 spin_unlock_irqrestore(&lockres->l_lock, flags);
1477 goto bail;
1478 }
1479
1480 if (lockres->l_flags & OCFS2_LOCK_REFRESHING) {
1481 spin_unlock_irqrestore(&lockres->l_lock, flags);
1482
1483 ocfs2_wait_on_refreshing_lock(lockres);
1484 goto refresh_check;
1485 }
1486
1487 /* Ok, I'll be the one to refresh this lock. */
1488 lockres_or_flags(lockres, OCFS2_LOCK_REFRESHING);
1489 spin_unlock_irqrestore(&lockres->l_lock, flags);
1490
1491 status = 1;
1492bail:
1493 mlog_exit(status);
1494 return status;
1495}
1496
1497/* If status is non zero, I'll mark it as not being in refresh
1498 * anymroe, but i won't clear the needs refresh flag. */
1499static inline void ocfs2_complete_lock_res_refresh(struct ocfs2_lock_res *lockres,
1500 int status)
1501{
1502 unsigned long flags;
1503 mlog_entry_void();
1504
1505 spin_lock_irqsave(&lockres->l_lock, flags);
1506 lockres_clear_flags(lockres, OCFS2_LOCK_REFRESHING);
1507 if (!status)
1508 lockres_clear_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH);
1509 spin_unlock_irqrestore(&lockres->l_lock, flags);
1510
1511 wake_up(&lockres->l_event);
1512
1513 mlog_exit_void();
1514}
1515
1516/* may or may not return a bh if it went to disk. */
1517static int ocfs2_meta_lock_update(struct inode *inode,
1518 struct buffer_head **bh)
1519{
1520 int status = 0;
1521 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1522 struct ocfs2_lock_res *lockres;
1523 struct ocfs2_dinode *fe;
1524
1525 mlog_entry_void();
1526
1527 spin_lock(&oi->ip_lock);
1528 if (oi->ip_flags & OCFS2_INODE_DELETED) {
b0697053 1529 mlog(0, "Orphaned inode %llu was deleted while we "
ccd979bd 1530 "were waiting on a lock. ip_flags = 0x%x\n",
b0697053 1531 (unsigned long long)oi->ip_blkno, oi->ip_flags);
ccd979bd
MF		 1532 spin_unlock(&oi->ip_lock);
1533 status = -ENOENT;
1534 goto bail;
1535 }
1536 spin_unlock(&oi->ip_lock);
1537
1538 lockres = &oi->ip_meta_lockres;
1539
1540 if (!ocfs2_should_refresh_lock_res(lockres))
1541 goto bail;
1542
1543 /* This will discard any caching information we might have had
1544 * for the inode metadata. */
1545 ocfs2_metadata_cache_purge(inode);
1546
1547 /* will do nothing for inode types that don't use the extent
1548 * map (directories, bitmap files, etc) */
1549 ocfs2_extent_map_trunc(inode, 0);
1550
f9e2d82e 1551 if (ocfs2_meta_lvb_is_trustable(inode, lockres)) {
b0697053
MF		 1552 mlog(0, "Trusting LVB on inode %llu\n",
1553 (unsigned long long)oi->ip_blkno);
ccd979bd
MF		 1554 ocfs2_refresh_inode_from_lvb(inode);
1555 } else {
1556 /* Boo, we have to go to disk. */
1557 /* read bh, cast, ocfs2_refresh_inode */
1558 status = ocfs2_read_block(OCFS2_SB(inode->i_sb), oi->ip_blkno,
1559 bh, OCFS2_BH_CACHED, inode);
1560 if (status < 0) {
1561 mlog_errno(status);
1562 goto bail_refresh;
1563 }
1564 fe = (struct ocfs2_dinode *) (*bh)->b_data;
1565
1566 /* This is a good chance to make sure we're not
1567 * locking an invalid object.
1568 *
1569 * We bug on a stale inode here because we checked
1570 * above whether it was wiped from disk. The wiping
1571 * node provides a guarantee that we receive that
1572 * message and can mark the inode before dropping any
1573 * locks associated with it. */
1574 if (!OCFS2_IS_VALID_DINODE(fe)) {
1575 OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe);
1576 status = -EIO;
1577 goto bail_refresh;
1578 }
1579 mlog_bug_on_msg(inode->i_generation !=
1580 le32_to_cpu(fe->i_generation),
b0697053 1581 "Invalid dinode %llu disk generation: %u "
ccd979bd 1582 "inode->i_generation: %u\n",
b0697053
MF		 1583 (unsigned long long)oi->ip_blkno,
1584 le32_to_cpu(fe->i_generation),
ccd979bd
MF		 1585 inode->i_generation);
1586 mlog_bug_on_msg(le64_to_cpu(fe->i_dtime) ||
1587 !(fe->i_flags & cpu_to_le32(OCFS2_VALID_FL)),
b0697053
MF		 1588 "Stale dinode %llu dtime: %llu flags: 0x%x\n",
1589 (unsigned long long)oi->ip_blkno,
1590 (unsigned long long)le64_to_cpu(fe->i_dtime),
ccd979bd
MF		 1591 le32_to_cpu(fe->i_flags));
1592
1593 ocfs2_refresh_inode(inode, fe);
1594 }
1595
1596 status = 0;
1597bail_refresh:
1598 ocfs2_complete_lock_res_refresh(lockres, status);
1599bail:
1600 mlog_exit(status);
1601 return status;
1602}
1603
1604static int ocfs2_assign_bh(struct inode *inode,
1605 struct buffer_head **ret_bh,
1606 struct buffer_head *passed_bh)
1607{
1608 int status;
1609
1610 if (passed_bh) {
1611 /* Ok, the update went to disk for us, use the
1612 * returned bh. */
1613 *ret_bh = passed_bh;
1614 get_bh(*ret_bh);
1615
1616 return 0;
1617 }
1618
1619 status = ocfs2_read_block(OCFS2_SB(inode->i_sb),
1620 OCFS2_I(inode)->ip_blkno,
1621 ret_bh,
1622 OCFS2_BH_CACHED,
1623 inode);
1624 if (status < 0)
1625 mlog_errno(status);
1626
1627 return status;
1628}
1629
1630/*
1631 * returns < 0 error if the callback will never be called, otherwise
1632 * the result of the lock will be communicated via the callback.
1633 */
1634int ocfs2_meta_lock_full(struct inode *inode,
1635 struct ocfs2_journal_handle *handle,
1636 struct buffer_head **ret_bh,
1637 int ex,
1638 int arg_flags)
1639{
1640 int status, level, dlm_flags, acquired;
1641 struct ocfs2_lock_res *lockres;
1642 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1643 struct buffer_head *local_bh = NULL;
1644
1645 BUG_ON(!inode);
1646
1647 mlog_entry_void();
1648
b0697053
MF		 1649 mlog(0, "inode %llu, take %s META lock\n",
1650 (unsigned long long)OCFS2_I(inode)->ip_blkno,
ccd979bd
MF		 1651 ex ? "EXMODE" : "PRMODE");
1652
1653 status = 0;
1654 acquired = 0;
1655 /* We'll allow faking a readonly metadata lock for
1656 * rodevices. */
1657 if (ocfs2_is_hard_readonly(osb)) {
1658 if (ex)
1659 status = -EROFS;
1660 goto bail;
1661 }
1662
1663 if (!(arg_flags & OCFS2_META_LOCK_RECOVERY))
1664 wait_event(osb->recovery_event,
1665 ocfs2_node_map_is_empty(osb, &osb->recovery_map));
1666
1667 acquired = 0;
1668 lockres = &OCFS2_I(inode)->ip_meta_lockres;
1669 level = ex ? LKM_EXMODE : LKM_PRMODE;
1670 dlm_flags = 0;
1671 if (arg_flags & OCFS2_META_LOCK_NOQUEUE)
1672 dlm_flags |= LKM_NOQUEUE;
1673
1674 status = ocfs2_cluster_lock(osb, lockres, level, dlm_flags, arg_flags);
1675 if (status < 0) {
1676 if (status != -EAGAIN && status != -EIOCBRETRY)
1677 mlog_errno(status);
1678 goto bail;
1679 }
1680
1681 /* Notify the error cleanup path to drop the cluster lock. */
1682 acquired = 1;
1683
1684 /* We wait twice because a node may have died while we were in
1685 * the lower dlm layers. The second time though, we've
1686 * committed to owning this lock so we don't allow signals to
1687 * abort the operation. */
1688 if (!(arg_flags & OCFS2_META_LOCK_RECOVERY))
1689 wait_event(osb->recovery_event,
1690 ocfs2_node_map_is_empty(osb, &osb->recovery_map));
1691
24c19ef4
MF		 1692 /*
1693 * We only see this flag if we're being called from
1694 * ocfs2_read_locked_inode(). It means we're locking an inode
1695 * which hasn't been populated yet, so clear the refresh flag
1696 * and let the caller handle it.
1697 */
1698 if (inode->i_state & I_NEW) {
1699 status = 0;
1700 ocfs2_complete_lock_res_refresh(lockres, 0);
1701 goto bail;
1702 }
1703
ccd979bd
MF		 1704 /* This is fun. The caller may want a bh back, or it may
1705 * not. ocfs2_meta_lock_update definitely wants one in, but
1706 * may or may not read one, depending on what's in the
1707 * LVB. The result of all of this is that we've *only* gone to
1708 * disk if we have to, so the complexity is worthwhile. */
1709 status = ocfs2_meta_lock_update(inode, &local_bh);
1710 if (status < 0) {
1711 if (status != -ENOENT)
1712 mlog_errno(status);
1713 goto bail;
1714 }
1715
1716 if (ret_bh) {
1717 status = ocfs2_assign_bh(inode, ret_bh, local_bh);
1718 if (status < 0) {
1719 mlog_errno(status);
1720 goto bail;
1721 }
1722 }
1723
1724 if (handle) {
1725 status = ocfs2_handle_add_lock(handle, inode);
1726 if (status < 0)
1727 mlog_errno(status);
1728 }
1729
1730bail:
1731 if (status < 0) {
1732 if (ret_bh && (*ret_bh)) {
1733 brelse(*ret_bh);
1734 *ret_bh = NULL;
1735 }
1736 if (acquired)
1737 ocfs2_meta_unlock(inode, ex);
1738 }
1739
1740 if (local_bh)
1741 brelse(local_bh);
1742
1743 mlog_exit(status);
1744 return status;
1745}
1746
1747/*
1748 * This is working around a lock inversion between tasks acquiring DLM locks
1749 * while holding a page lock and the vote thread which blocks dlm lock acquiry
1750 * while acquiring page locks.
1751 *
1752 * ** These _with_page variantes are only intended to be called from aop
1753 * methods that hold page locks and return a very specific *positive* error
1754 * code that aop methods pass up to the VFS -- test for errors with != 0. **
1755 *
1756 * The DLM is called such that it returns -EAGAIN if it would have blocked
1757 * waiting for the vote thread. In that case we unlock our page so the vote
1758 * thread can make progress. Once we've done this we have to return
1759 * AOP_TRUNCATED_PAGE so the aop method that called us can bubble that back up
1760 * into the VFS who will then immediately retry the aop call.
1761 *
1762 * We do a blocking lock and immediate unlock before returning, though, so that
1763 * the lock has a great chance of being cached on this node by the time the VFS
1764 * calls back to retry the aop. This has a potential to livelock as nodes
1765 * ping locks back and forth, but that's a risk we're willing to take to avoid
1766 * the lock inversion simply.
1767 */
1768int ocfs2_meta_lock_with_page(struct inode *inode,
1769 struct ocfs2_journal_handle *handle,
1770 struct buffer_head **ret_bh,
1771 int ex,
1772 struct page *page)
1773{
1774 int ret;
1775
1776 ret = ocfs2_meta_lock_full(inode, handle, ret_bh, ex,
1777 OCFS2_LOCK_NONBLOCK);
1778 if (ret == -EAGAIN) {
1779 unlock_page(page);
1780 if (ocfs2_meta_lock(inode, handle, ret_bh, ex) == 0)
1781 ocfs2_meta_unlock(inode, ex);
1782 ret = AOP_TRUNCATED_PAGE;
1783 }
1784
1785 return ret;
1786}
1787
1788void ocfs2_meta_unlock(struct inode *inode,
1789 int ex)
1790{
1791 int level = ex ? LKM_EXMODE : LKM_PRMODE;
1792 struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_meta_lockres;
1793
1794 mlog_entry_void();
1795
b0697053
MF		 1796 mlog(0, "inode %llu drop %s META lock\n",
1797 (unsigned long long)OCFS2_I(inode)->ip_blkno,
ccd979bd
MF		 1798 ex ? "EXMODE" : "PRMODE");
1799
1800 if (!ocfs2_is_hard_readonly(OCFS2_SB(inode->i_sb)))
1801 ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level);
1802
1803 mlog_exit_void();
1804}
1805
1806int ocfs2_super_lock(struct ocfs2_super *osb,
1807 int ex)
1808{
1809 int status;
1810 int level = ex ? LKM_EXMODE : LKM_PRMODE;
1811 struct ocfs2_lock_res *lockres = &osb->osb_super_lockres;
1812 struct buffer_head *bh;
1813 struct ocfs2_slot_info *si = osb->slot_info;
1814
1815 mlog_entry_void();
1816
1817 if (ocfs2_is_hard_readonly(osb))
1818 return -EROFS;
1819
1820 status = ocfs2_cluster_lock(osb, lockres, level, 0, 0);
1821 if (status < 0) {
1822 mlog_errno(status);
1823 goto bail;
1824 }
1825
1826 /* The super block lock path is really in the best position to
1827 * know when resources covered by the lock need to be
1828 * refreshed, so we do it here. Of course, making sense of
1829 * everything is up to the caller :) */
1830 status = ocfs2_should_refresh_lock_res(lockres);
1831 if (status < 0) {
1832 mlog_errno(status);
1833 goto bail;
1834 }
1835 if (status) {
1836 bh = si->si_bh;
1837 status = ocfs2_read_block(osb, bh->b_blocknr, &bh, 0,
1838 si->si_inode);
1839 if (status == 0)
1840 ocfs2_update_slot_info(si);
1841
1842 ocfs2_complete_lock_res_refresh(lockres, status);
1843
1844 if (status < 0)
1845 mlog_errno(status);
1846 }
1847bail:
1848 mlog_exit(status);
1849 return status;
1850}
1851
1852void ocfs2_super_unlock(struct ocfs2_super *osb,
1853 int ex)
1854{
1855 int level = ex ? LKM_EXMODE : LKM_PRMODE;
1856 struct ocfs2_lock_res *lockres = &osb->osb_super_lockres;
1857
1858 ocfs2_cluster_unlock(osb, lockres, level);
1859}
1860
1861int ocfs2_rename_lock(struct ocfs2_super *osb)
1862{
1863 int status;
1864 struct ocfs2_lock_res *lockres = &osb->osb_rename_lockres;
1865
1866 if (ocfs2_is_hard_readonly(osb))
1867 return -EROFS;
1868
1869 status = ocfs2_cluster_lock(osb, lockres, LKM_EXMODE, 0, 0);
1870 if (status < 0)
1871 mlog_errno(status);
1872
1873 return status;
1874}
1875
1876void ocfs2_rename_unlock(struct ocfs2_super *osb)
1877{
1878 struct ocfs2_lock_res *lockres = &osb->osb_rename_lockres;
1879
1880 ocfs2_cluster_unlock(osb, lockres, LKM_EXMODE);
1881}
1882
d680efe9
MF		 1883int ocfs2_dentry_lock(struct dentry *dentry, int ex)
1884{
1885 int ret;
1886 int level = ex ? LKM_EXMODE : LKM_PRMODE;
1887 struct ocfs2_dentry_lock *dl = dentry->d_fsdata;
1888 struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
1889
1890 BUG_ON(!dl);
1891
1892 if (ocfs2_is_hard_readonly(osb))
1893 return -EROFS;
1894
1895 ret = ocfs2_cluster_lock(osb, &dl->dl_lockres, level, 0, 0);
1896 if (ret < 0)
1897 mlog_errno(ret);
1898
1899 return ret;
1900}
1901
1902void ocfs2_dentry_unlock(struct dentry *dentry, int ex)
1903{
1904 int level = ex ? LKM_EXMODE : LKM_PRMODE;
1905 struct ocfs2_dentry_lock *dl = dentry->d_fsdata;
1906 struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
1907
1908 ocfs2_cluster_unlock(osb, &dl->dl_lockres, level);
1909}
1910
ccd979bd
MF		 1911/* Reference counting of the dlm debug structure. We want this because
1912 * open references on the debug inodes can live on after a mount, so
1913 * we can't rely on the ocfs2_super to always exist. */
1914static void ocfs2_dlm_debug_free(struct kref *kref)
1915{
1916 struct ocfs2_dlm_debug *dlm_debug;
1917
1918 dlm_debug = container_of(kref, struct ocfs2_dlm_debug, d_refcnt);
1919
1920 kfree(dlm_debug);
1921}
1922
1923void ocfs2_put_dlm_debug(struct ocfs2_dlm_debug *dlm_debug)
1924{
1925 if (dlm_debug)
1926 kref_put(&dlm_debug->d_refcnt, ocfs2_dlm_debug_free);
1927}
1928
1929static void ocfs2_get_dlm_debug(struct ocfs2_dlm_debug *debug)
1930{
1931 kref_get(&debug->d_refcnt);
1932}
1933
1934struct ocfs2_dlm_debug *ocfs2_new_dlm_debug(void)
1935{
1936 struct ocfs2_dlm_debug *dlm_debug;
1937
1938 dlm_debug = kmalloc(sizeof(struct ocfs2_dlm_debug), GFP_KERNEL);
1939 if (!dlm_debug) {
1940 mlog_errno(-ENOMEM);
1941 goto out;
1942 }
1943
1944 kref_init(&dlm_debug->d_refcnt);
1945 INIT_LIST_HEAD(&dlm_debug->d_lockres_tracking);
1946 dlm_debug->d_locking_state = NULL;
1947out:
1948 return dlm_debug;
1949}
1950
1951/* Access to this is arbitrated for us via seq_file->sem. */
1952struct ocfs2_dlm_seq_priv {
1953 struct ocfs2_dlm_debug *p_dlm_debug;
1954 struct ocfs2_lock_res p_iter_res;
1955 struct ocfs2_lock_res p_tmp_res;
1956};
1957
1958static struct ocfs2_lock_res *ocfs2_dlm_next_res(struct ocfs2_lock_res *start,
1959 struct ocfs2_dlm_seq_priv *priv)
1960{
1961 struct ocfs2_lock_res *iter, *ret = NULL;
1962 struct ocfs2_dlm_debug *dlm_debug = priv->p_dlm_debug;
1963
1964 assert_spin_locked(&ocfs2_dlm_tracking_lock);
1965
1966 list_for_each_entry(iter, &start->l_debug_list, l_debug_list) {
1967 /* discover the head of the list */
1968 if (&iter->l_debug_list == &dlm_debug->d_lockres_tracking) {
1969 mlog(0, "End of list found, %p\n", ret);
1970 break;
1971 }
1972
1973 /* We track our "dummy" iteration lockres' by a NULL
1974 * l_ops field. */
1975 if (iter->l_ops != NULL) {
1976 ret = iter;
1977 break;
1978 }
1979 }
1980
1981 return ret;
1982}
1983
1984static void *ocfs2_dlm_seq_start(struct seq_file *m, loff_t *pos)
1985{
1986 struct ocfs2_dlm_seq_priv *priv = m->private;
1987 struct ocfs2_lock_res *iter;
1988
1989 spin_lock(&ocfs2_dlm_tracking_lock);
1990 iter = ocfs2_dlm_next_res(&priv->p_iter_res, priv);
1991 if (iter) {
1992 /* Since lockres' have the lifetime of their container
1993 * (which can be inodes, ocfs2_supers, etc) we want to
1994 * copy this out to a temporary lockres while still
1995 * under the spinlock. Obviously after this we can't
1996 * trust any pointers on the copy returned, but that's
1997 * ok as the information we want isn't typically held
1998 * in them. */
1999 priv->p_tmp_res = *iter;
2000 iter = &priv->p_tmp_res;
2001 }
2002 spin_unlock(&ocfs2_dlm_tracking_lock);
2003
2004 return iter;
2005}
2006
2007static void ocfs2_dlm_seq_stop(struct seq_file *m, void *v)
2008{
2009}
2010
2011static void *ocfs2_dlm_seq_next(struct seq_file *m, void *v, loff_t *pos)
2012{
2013 struct ocfs2_dlm_seq_priv *priv = m->private;
2014 struct ocfs2_lock_res *iter = v;
2015 struct ocfs2_lock_res *dummy = &priv->p_iter_res;
2016
2017 spin_lock(&ocfs2_dlm_tracking_lock);
2018 iter = ocfs2_dlm_next_res(iter, priv);
2019 list_del_init(&dummy->l_debug_list);
2020 if (iter) {
2021 list_add(&dummy->l_debug_list, &iter->l_debug_list);
2022 priv->p_tmp_res = *iter;
2023 iter = &priv->p_tmp_res;
2024 }
2025 spin_unlock(&ocfs2_dlm_tracking_lock);
2026
2027 return iter;
2028}
2029
2030/* So that debugfs.ocfs2 can determine which format is being used */
2031#define OCFS2_DLM_DEBUG_STR_VERSION 1
2032static int ocfs2_dlm_seq_show(struct seq_file *m, void *v)
2033{
2034 int i;
2035 char *lvb;
2036 struct ocfs2_lock_res *lockres = v;
2037
2038 if (!lockres)
2039 return -EINVAL;
2040
d680efe9
MF		 2041 seq_printf(m, "0x%x\t", OCFS2_DLM_DEBUG_STR_VERSION);
2042
2043 if (lockres->l_type == OCFS2_LOCK_TYPE_DENTRY)
2044 seq_printf(m, "%.*s%08x\t", OCFS2_DENTRY_LOCK_INO_START - 1,
2045 lockres->l_name,
2046 (unsigned int)ocfs2_get_dentry_lock_ino(lockres));
2047 else
2048 seq_printf(m, "%.*s\t", OCFS2_LOCK_ID_MAX_LEN, lockres->l_name);
2049
2050 seq_printf(m, "%d\t"
ccd979bd
MF		 2051 "0x%lx\t"
2052 "0x%x\t"
2053 "0x%x\t"
2054 "%u\t"
2055 "%u\t"
2056 "%d\t"
2057 "%d\t",
ccd979bd
MF		 2058 lockres->l_level,
2059 lockres->l_flags,
2060 lockres->l_action,
2061 lockres->l_unlock_action,
2062 lockres->l_ro_holders,
2063 lockres->l_ex_holders,
2064 lockres->l_requested,
2065 lockres->l_blocking);
2066
2067 /* Dump the raw LVB */
2068 lvb = lockres->l_lksb.lvb;
2069 for(i = 0; i < DLM_LVB_LEN; i++)
2070 seq_printf(m, "0x%x\t", lvb[i]);
2071
2072 /* End the line */
2073 seq_printf(m, "\n");
2074 return 0;
2075}
2076
2077static struct seq_operations ocfs2_dlm_seq_ops = {
2078 .start = ocfs2_dlm_seq_start,
2079 .stop = ocfs2_dlm_seq_stop,
2080 .next = ocfs2_dlm_seq_next,
2081 .show = ocfs2_dlm_seq_show,
2082};
2083
2084static int ocfs2_dlm_debug_release(struct inode *inode, struct file *file)
2085{
2086 struct seq_file *seq = (struct seq_file *) file->private_data;
2087 struct ocfs2_dlm_seq_priv *priv = seq->private;
2088 struct ocfs2_lock_res *res = &priv->p_iter_res;
2089
2090 ocfs2_remove_lockres_tracking(res);
2091 ocfs2_put_dlm_debug(priv->p_dlm_debug);
2092 return seq_release_private(inode, file);
2093}
2094
2095static int ocfs2_dlm_debug_open(struct inode *inode, struct file *file)
2096{
2097 int ret;
2098 struct ocfs2_dlm_seq_priv *priv;
2099 struct seq_file *seq;
2100 struct ocfs2_super *osb;
2101
2102 priv = kzalloc(sizeof(struct ocfs2_dlm_seq_priv), GFP_KERNEL);
2103 if (!priv) {
2104 ret = -ENOMEM;
2105 mlog_errno(ret);
2106 goto out;
2107 }
2108 osb = (struct ocfs2_super *) inode->u.generic_ip;
2109 ocfs2_get_dlm_debug(osb->osb_dlm_debug);
2110 priv->p_dlm_debug = osb->osb_dlm_debug;
2111 INIT_LIST_HEAD(&priv->p_iter_res.l_debug_list);
2112
2113 ret = seq_open(file, &ocfs2_dlm_seq_ops);
2114 if (ret) {
2115 kfree(priv);
2116 mlog_errno(ret);
2117 goto out;
2118 }
2119
2120 seq = (struct seq_file *) file->private_data;
2121 seq->private = priv;
2122
2123 ocfs2_add_lockres_tracking(&priv->p_iter_res,
2124 priv->p_dlm_debug);
2125
2126out:
2127 return ret;
2128}
2129
4b6f5d20 2130static const struct file_operations ocfs2_dlm_debug_fops = {
ccd979bd
MF		 2131 .open = ocfs2_dlm_debug_open,
2132 .release = ocfs2_dlm_debug_release,
2133 .read = seq_read,
2134 .llseek = seq_lseek,
2135};
2136
2137static int ocfs2_dlm_init_debug(struct ocfs2_super *osb)
2138{
2139 int ret = 0;
2140 struct ocfs2_dlm_debug *dlm_debug = osb->osb_dlm_debug;
2141
2142 dlm_debug->d_locking_state = debugfs_create_file("locking_state",
2143 S_IFREG|S_IRUSR,
2144 osb->osb_debug_root,
2145 osb,
2146 &ocfs2_dlm_debug_fops);
2147 if (!dlm_debug->d_locking_state) {
2148 ret = -EINVAL;
2149 mlog(ML_ERROR,
2150 "Unable to create locking state debugfs file.\n");
2151 goto out;
2152 }
2153
2154 ocfs2_get_dlm_debug(dlm_debug);
2155out:
2156 return ret;
2157}
2158
2159static void ocfs2_dlm_shutdown_debug(struct ocfs2_super *osb)
2160{
2161 struct ocfs2_dlm_debug *dlm_debug = osb->osb_dlm_debug;
2162
2163 if (dlm_debug) {
2164 debugfs_remove(dlm_debug->d_locking_state);
2165 ocfs2_put_dlm_debug(dlm_debug);
2166 }
2167}
2168
2169int ocfs2_dlm_init(struct ocfs2_super *osb)
2170{
2171 int status;
2172 u32 dlm_key;
2173 struct dlm_ctxt *dlm;
2174
2175 mlog_entry_void();
2176
2177 status = ocfs2_dlm_init_debug(osb);
2178 if (status < 0) {
2179 mlog_errno(status);
2180 goto bail;
2181 }
2182
2183 /* launch vote thread */
78427043 2184 osb->vote_task = kthread_run(ocfs2_vote_thread, osb, "ocfs2vote");
ccd979bd
MF		 2185 if (IS_ERR(osb->vote_task)) {
2186 status = PTR_ERR(osb->vote_task);
2187 osb->vote_task = NULL;
2188 mlog_errno(status);
2189 goto bail;
2190 }
2191
2192 /* used by the dlm code to make message headers unique, each
2193 * node in this domain must agree on this. */
2194 dlm_key = crc32_le(0, osb->uuid_str, strlen(osb->uuid_str));
2195
2196 /* for now, uuid == domain */
2197 dlm = dlm_register_domain(osb->uuid_str, dlm_key);
2198 if (IS_ERR(dlm)) {
2199 status = PTR_ERR(dlm);
2200 mlog_errno(status);
2201 goto bail;
2202 }
2203
2204 ocfs2_super_lock_res_init(&osb->osb_super_lockres, osb);
2205 ocfs2_rename_lock_res_init(&osb->osb_rename_lockres, osb);
2206
2207 dlm_register_eviction_cb(dlm, &osb->osb_eviction_cb);
2208
2209 osb->dlm = dlm;
2210
2211 status = 0;
2212bail:
2213 if (status < 0) {
2214 ocfs2_dlm_shutdown_debug(osb);
2215 if (osb->vote_task)
2216 kthread_stop(osb->vote_task);
2217 }
2218
2219 mlog_exit(status);
2220 return status;
2221}
2222
2223void ocfs2_dlm_shutdown(struct ocfs2_super *osb)
2224{
2225 mlog_entry_void();
2226
2227 dlm_unregister_eviction_cb(&osb->osb_eviction_cb);
2228
2229 ocfs2_drop_osb_locks(osb);
2230
2231 if (osb->vote_task) {
2232 kthread_stop(osb->vote_task);
2233 osb->vote_task = NULL;
2234 }
2235
2236 ocfs2_lock_res_free(&osb->osb_super_lockres);
2237 ocfs2_lock_res_free(&osb->osb_rename_lockres);
2238
2239 dlm_unregister_domain(osb->dlm);
2240 osb->dlm = NULL;
2241
2242 ocfs2_dlm_shutdown_debug(osb);
2243
2244 mlog_exit_void();
2245}
2246
2a45f2d1 2247static void ocfs2_unlock_ast(void *opaque, enum dlm_status status)
ccd979bd
MF		 2248{
2249 struct ocfs2_lock_res *lockres = opaque;
2250 unsigned long flags;
2251
2252 mlog_entry_void();
2253
2254 mlog(0, "UNLOCK AST called on lock %s, action = %d\n", lockres->l_name,
2255 lockres->l_unlock_action);
2256
2257 spin_lock_irqsave(&lockres->l_lock, flags);
2258 /* We tried to cancel a convert request, but it was already
2259 * granted. All we want to do here is clear our unlock
2260 * state. The wake_up call done at the bottom is redundant
2261 * (ocfs2_prepare_cancel_convert doesn't sleep on this) but doesn't
2262 * hurt anything anyway */
2263 if (status == DLM_CANCELGRANT &&
2264 lockres->l_unlock_action == OCFS2_UNLOCK_CANCEL_CONVERT) {
2265 mlog(0, "Got cancelgrant for %s\n", lockres->l_name);
2266
2267 /* We don't clear the busy flag in this case as it
2268 * should have been cleared by the ast which the dlm
2269 * has called. */
2270 goto complete_unlock;
2271 }
2272
2273 if (status != DLM_NORMAL) {
2274 mlog(ML_ERROR, "Dlm passes status %d for lock %s, "
2275 "unlock_action %d\n", status, lockres->l_name,
2276 lockres->l_unlock_action);
2277 spin_unlock_irqrestore(&lockres->l_lock, flags);
2278 return;
2279 }
2280
2281 switch(lockres->l_unlock_action) {
2282 case OCFS2_UNLOCK_CANCEL_CONVERT:
2283 mlog(0, "Cancel convert success for %s\n", lockres->l_name);
2284 lockres->l_action = OCFS2_AST_INVALID;
2285 break;
2286 case OCFS2_UNLOCK_DROP_LOCK:
2287 lockres->l_level = LKM_IVMODE;
2288 break;
2289 default:
2290 BUG();
2291 }
2292
2293 lockres_clear_flags(lockres, OCFS2_LOCK_BUSY);
2294complete_unlock:
2295 lockres->l_unlock_action = OCFS2_UNLOCK_INVALID;
2296 spin_unlock_irqrestore(&lockres->l_lock, flags);
2297
2298 wake_up(&lockres->l_event);
2299
2300 mlog_exit_void();
2301}
2302
2303typedef void (ocfs2_pre_drop_cb_t)(struct ocfs2_lock_res *, void *);
2304
2305struct drop_lock_cb {
2306 ocfs2_pre_drop_cb_t *drop_func;
2307 void *drop_data;
2308};
2309
2310static int ocfs2_drop_lock(struct ocfs2_super *osb,
2311 struct ocfs2_lock_res *lockres,
2312 struct drop_lock_cb *dcb)
2313{
2314 enum dlm_status status;
2315 unsigned long flags;
2316
2317 /* We didn't get anywhere near actually using this lockres. */
2318 if (!(lockres->l_flags & OCFS2_LOCK_INITIALIZED))
2319 goto out;
2320
2321 spin_lock_irqsave(&lockres->l_lock, flags);
2322
2323 mlog_bug_on_msg(!(lockres->l_flags & OCFS2_LOCK_FREEING),
2324 "lockres %s, flags 0x%lx\n",
2325 lockres->l_name, lockres->l_flags);
2326
2327 while (lockres->l_flags & OCFS2_LOCK_BUSY) {
2328 mlog(0, "waiting on busy lock \"%s\": flags = %lx, action = "
2329 "%u, unlock_action = %u\n",
2330 lockres->l_name, lockres->l_flags, lockres->l_action,
2331 lockres->l_unlock_action);
2332
2333 spin_unlock_irqrestore(&lockres->l_lock, flags);
2334
2335 /* XXX: Today we just wait on any busy
2336 * locks... Perhaps we need to cancel converts in the
2337 * future? */
2338 ocfs2_wait_on_busy_lock(lockres);
2339
2340 spin_lock_irqsave(&lockres->l_lock, flags);
2341 }
2342
2343 if (dcb)
2344 dcb->drop_func(lockres, dcb->drop_data);
2345
2346 if (lockres->l_flags & OCFS2_LOCK_BUSY)
2347 mlog(ML_ERROR, "destroying busy lock: \"%s\"\n",
2348 lockres->l_name);
2349 if (lockres->l_flags & OCFS2_LOCK_BLOCKED)
2350 mlog(0, "destroying blocked lock: \"%s\"\n", lockres->l_name);
2351
2352 if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) {
2353 spin_unlock_irqrestore(&lockres->l_lock, flags);
2354 goto out;
2355 }
2356
2357 lockres_clear_flags(lockres, OCFS2_LOCK_ATTACHED);
2358
2359 /* make sure we never get here while waiting for an ast to
2360 * fire. */
2361 BUG_ON(lockres->l_action != OCFS2_AST_INVALID);
2362
2363 /* is this necessary? */
2364 lockres_or_flags(lockres, OCFS2_LOCK_BUSY);
2365 lockres->l_unlock_action = OCFS2_UNLOCK_DROP_LOCK;
2366 spin_unlock_irqrestore(&lockres->l_lock, flags);
2367
2368 mlog(0, "lock %s\n", lockres->l_name);
2369
2370 status = dlmunlock(osb->dlm, &lockres->l_lksb, LKM_VALBLK,
2a45f2d1 2371 ocfs2_unlock_ast, lockres);
ccd979bd
MF		 2372 if (status != DLM_NORMAL) {
2373 ocfs2_log_dlm_error("dlmunlock", status, lockres);
2374 mlog(ML_ERROR, "lockres flags: %lu\n", lockres->l_flags);
2375 dlm_print_one_lock(lockres->l_lksb.lockid);
2376 BUG();
2377 }
2378 mlog(0, "lock %s, successfull return from dlmunlock\n",
2379 lockres->l_name);
2380
2381 ocfs2_wait_on_busy_lock(lockres);
2382out:
2383 mlog_exit(0);
2384 return 0;
2385}
2386
2387/* Mark the lockres as being dropped. It will no longer be
2388 * queued if blocking, but we still may have to wait on it
2389 * being dequeued from the vote thread before we can consider
2390 * it safe to drop.
2391 *
2392 * You can *not* attempt to call cluster_lock on this lockres anymore. */
2393void ocfs2_mark_lockres_freeing(struct ocfs2_lock_res *lockres)
2394{
2395 int status;
2396 struct ocfs2_mask_waiter mw;
2397 unsigned long flags;
2398
2399 ocfs2_init_mask_waiter(&mw);
2400
2401 spin_lock_irqsave(&lockres->l_lock, flags);
2402 lockres->l_flags |= OCFS2_LOCK_FREEING;
2403 while (lockres->l_flags & OCFS2_LOCK_QUEUED) {
2404 lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_QUEUED, 0);
2405 spin_unlock_irqrestore(&lockres->l_lock, flags);
2406
2407 mlog(0, "Waiting on lockres %s\n", lockres->l_name);
2408
2409 status = ocfs2_wait_for_mask(&mw);
2410 if (status)
2411 mlog_errno(status);
2412
2413 spin_lock_irqsave(&lockres->l_lock, flags);
2414 }
2415 spin_unlock_irqrestore(&lockres->l_lock, flags);
2416}
2417
d680efe9
MF		 2418void ocfs2_simple_drop_lockres(struct ocfs2_super *osb,
2419 struct ocfs2_lock_res *lockres)
ccd979bd 2420{
d680efe9 2421 int ret;
ccd979bd 2422
d680efe9
MF		 2423 ocfs2_mark_lockres_freeing(lockres);
2424 ret = ocfs2_drop_lock(osb, lockres, NULL);
2425 if (ret)
2426 mlog_errno(ret);
2427}
ccd979bd 2428
d680efe9
MF		 2429static void ocfs2_drop_osb_locks(struct ocfs2_super *osb)
2430{
2431 ocfs2_simple_drop_lockres(osb, &osb->osb_super_lockres);
2432 ocfs2_simple_drop_lockres(osb, &osb->osb_rename_lockres);
ccd979bd
MF		 2433}
2434
2435static void ocfs2_meta_pre_drop(struct ocfs2_lock_res *lockres, void *data)
2436{
2437 struct inode *inode = data;
2438
2439 /* the metadata lock requires a bit more work as we have an
2440 * LVB to worry about. */
2441 if (lockres->l_flags & OCFS2_LOCK_ATTACHED &&
2442 lockres->l_level == LKM_EXMODE &&
2443 !(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH))
2444 __ocfs2_stuff_meta_lvb(inode);
2445}
2446
2447int ocfs2_drop_inode_locks(struct inode *inode)
2448{
2449 int status, err;
2450 struct drop_lock_cb meta_dcb = { ocfs2_meta_pre_drop, inode, };
2451
2452 mlog_entry_void();
2453
2454 /* No need to call ocfs2_mark_lockres_freeing here -
2455 * ocfs2_clear_inode has done it for us. */
2456
2457 err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb),
2458 &OCFS2_I(inode)->ip_data_lockres,
2459 NULL);
2460 if (err < 0)
2461 mlog_errno(err);
2462
2463 status = err;
2464
2465 err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb),
2466 &OCFS2_I(inode)->ip_meta_lockres,
2467 &meta_dcb);
2468 if (err < 0)
2469 mlog_errno(err);
2470 if (err < 0 && !status)
2471 status = err;
2472
2473 err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb),
2474 &OCFS2_I(inode)->ip_rw_lockres,
2475 NULL);
2476 if (err < 0)
2477 mlog_errno(err);
2478 if (err < 0 && !status)
2479 status = err;
2480
2481 mlog_exit(status);
2482 return status;
2483}
2484
2485static void ocfs2_prepare_downconvert(struct ocfs2_lock_res *lockres,
2486 int new_level)
2487{
2488 assert_spin_locked(&lockres->l_lock);
2489
2490 BUG_ON(lockres->l_blocking <= LKM_NLMODE);
2491
2492 if (lockres->l_level <= new_level) {
2493 mlog(ML_ERROR, "lockres->l_level (%u) <= new_level (%u)\n",
2494 lockres->l_level, new_level);
2495 BUG();
2496 }
2497
2498 mlog(0, "lock %s, new_level = %d, l_blocking = %d\n",
2499 lockres->l_name, new_level, lockres->l_blocking);
2500
2501 lockres->l_action = OCFS2_AST_DOWNCONVERT;
2502 lockres->l_requested = new_level;
2503 lockres_or_flags(lockres, OCFS2_LOCK_BUSY);
2504}
2505
2506static int ocfs2_downconvert_lock(struct ocfs2_super *osb,
2507 struct ocfs2_lock_res *lockres,
2508 int new_level,
2509 int lvb)
2510{
2511 int ret, dlm_flags = LKM_CONVERT;
2512 enum dlm_status status;
2513
2514 mlog_entry_void();
2515
2516 if (lvb)
2517 dlm_flags |= LKM_VALBLK;
2518
2519 status = dlmlock(osb->dlm,
2520 new_level,
2521 &lockres->l_lksb,
2522 dlm_flags,
2523 lockres->l_name,
f0681062 2524 OCFS2_LOCK_ID_MAX_LEN - 1,
e92d57df 2525 ocfs2_locking_ast,
ccd979bd
MF		 2526 lockres,
2527 lockres->l_ops->bast);
2528 if (status != DLM_NORMAL) {
2529 ocfs2_log_dlm_error("dlmlock", status, lockres);
2530 ret = -EINVAL;
2531 ocfs2_recover_from_dlm_error(lockres, 1);
2532 goto bail;
2533 }
2534
2535 ret = 0;
2536bail:
2537 mlog_exit(ret);
2538 return ret;
2539}
2540
2541/* returns 1 when the caller should unlock and call dlmunlock */
2542static int ocfs2_prepare_cancel_convert(struct ocfs2_super *osb,
2543 struct ocfs2_lock_res *lockres)
2544{
2545 assert_spin_locked(&lockres->l_lock);
2546
2547 mlog_entry_void();
2548 mlog(0, "lock %s\n", lockres->l_name);
2549
2550 if (lockres->l_unlock_action == OCFS2_UNLOCK_CANCEL_CONVERT) {
2551 /* If we're already trying to cancel a lock conversion
2552 * then just drop the spinlock and allow the caller to
2553 * requeue this lock. */
2554
2555 mlog(0, "Lockres %s, skip convert\n", lockres->l_name);
2556 return 0;
2557 }
2558
2559 /* were we in a convert when we got the bast fire? */
2560 BUG_ON(lockres->l_action != OCFS2_AST_CONVERT &&
2561 lockres->l_action != OCFS2_AST_DOWNCONVERT);
2562 /* set things up for the unlockast to know to just
2563 * clear out the ast_action and unset busy, etc. */
2564 lockres->l_unlock_action = OCFS2_UNLOCK_CANCEL_CONVERT;
2565
2566 mlog_bug_on_msg(!(lockres->l_flags & OCFS2_LOCK_BUSY),
2567 "lock %s, invalid flags: 0x%lx\n",
2568 lockres->l_name, lockres->l_flags);
2569
2570 return 1;
2571}
2572
2573static int ocfs2_cancel_convert(struct ocfs2_super *osb,
2574 struct ocfs2_lock_res *lockres)
2575{
2576 int ret;
2577 enum dlm_status status;
2578
2579 mlog_entry_void();
2580 mlog(0, "lock %s\n", lockres->l_name);
2581
2582 ret = 0;
2583 status = dlmunlock(osb->dlm,
2584 &lockres->l_lksb,
2585 LKM_CANCEL,
2a45f2d1 2586 ocfs2_unlock_ast,
ccd979bd
MF		 2587 lockres);
2588 if (status != DLM_NORMAL) {
2589 ocfs2_log_dlm_error("dlmunlock", status, lockres);
2590 ret = -EINVAL;
2591 ocfs2_recover_from_dlm_error(lockres, 0);
2592 }
2593
2594 mlog(0, "lock %s return from dlmunlock\n", lockres->l_name);
2595
2596 mlog_exit(ret);
2597 return ret;
2598}
2599
2600static inline int ocfs2_can_downconvert_meta_lock(struct inode *inode,
2601 struct ocfs2_lock_res *lockres,
2602 int new_level)
2603{
2604 int ret;
2605
2606 mlog_entry_void();
2607
2608 BUG_ON(new_level != LKM_NLMODE && new_level != LKM_PRMODE);
2609
2610 if (lockres->l_flags & OCFS2_LOCK_REFRESHING) {
2611 ret = 0;
2612 mlog(0, "lockres %s currently being refreshed -- backing "
2613 "off!\n", lockres->l_name);
2614 } else if (new_level == LKM_PRMODE)
2615 ret = !lockres->l_ex_holders &&
2616 ocfs2_inode_fully_checkpointed(inode);
2617 else /* Must be NLMODE we're converting to. */
2618 ret = !lockres->l_ro_holders && !lockres->l_ex_holders &&
2619 ocfs2_inode_fully_checkpointed(inode);
2620
2621 mlog_exit(ret);
2622 return ret;
2623}
2624
2625static int ocfs2_do_unblock_meta(struct inode *inode,
2626 int *requeue)
2627{
2628 int new_level;
2629 int set_lvb = 0;
2630 int ret = 0;
2631 struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_meta_lockres;
2632 unsigned long flags;
2633
2634 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2635
2636 mlog_entry_void();
2637
2638 spin_lock_irqsave(&lockres->l_lock, flags);
2639
2640 BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED));
2641
2642 mlog(0, "l_level=%d, l_blocking=%d\n", lockres->l_level,
2643 lockres->l_blocking);
2644
2645 BUG_ON(lockres->l_level != LKM_EXMODE &&
2646 lockres->l_level != LKM_PRMODE);
2647
2648 if (lockres->l_flags & OCFS2_LOCK_BUSY) {
2649 *requeue = 1;
2650 ret = ocfs2_prepare_cancel_convert(osb, lockres);
2651 spin_unlock_irqrestore(&lockres->l_lock, flags);
2652 if (ret) {
2653 ret = ocfs2_cancel_convert(osb, lockres);
2654 if (ret < 0)
2655 mlog_errno(ret);
2656 }
2657 goto leave;
2658 }
2659
2660 new_level = ocfs2_highest_compat_lock_level(lockres->l_blocking);
2661
2662 mlog(0, "l_level=%d, l_blocking=%d, new_level=%d\n",
2663 lockres->l_level, lockres->l_blocking, new_level);
2664
2665 if (ocfs2_can_downconvert_meta_lock(inode, lockres, new_level)) {
2666 if (lockres->l_level == LKM_EXMODE)
2667 set_lvb = 1;
2668
2669 /* If the lock hasn't been refreshed yet (rare), then
2670 * our memory inode values are old and we skip
2671 * stuffing the lvb. There's no need to actually clear
2672 * out the lvb here as it's value is still valid. */
2673 if (!(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) {
2674 if (set_lvb)
2675 __ocfs2_stuff_meta_lvb(inode);
2676 } else
2677 mlog(0, "lockres %s: downconverting stale lock!\n",
2678 lockres->l_name);
2679
2680 mlog(0, "calling ocfs2_downconvert_lock with l_level=%d, "
2681 "l_blocking=%d, new_level=%d\n",
2682 lockres->l_level, lockres->l_blocking, new_level);
2683
2684 ocfs2_prepare_downconvert(lockres, new_level);
2685 spin_unlock_irqrestore(&lockres->l_lock, flags);
2686 ret = ocfs2_downconvert_lock(osb, lockres, new_level, set_lvb);
2687 goto leave;
2688 }
2689 if (!ocfs2_inode_fully_checkpointed(inode))
2690 ocfs2_start_checkpoint(osb);
2691
2692 *requeue = 1;
2693 spin_unlock_irqrestore(&lockres->l_lock, flags);
2694 ret = 0;
2695leave:
2696 mlog_exit(ret);
2697 return ret;
2698}
2699
2700static int ocfs2_generic_unblock_lock(struct ocfs2_super *osb,
2701 struct ocfs2_lock_res *lockres,
d680efe9 2702 struct ocfs2_unblock_ctl *ctl,
ccd979bd
MF		 2703 ocfs2_convert_worker_t *worker)
2704{
2705 unsigned long flags;
2706 int blocking;
2707 int new_level;
2708 int ret = 0;
2709
2710 mlog_entry_void();
2711
2712 spin_lock_irqsave(&lockres->l_lock, flags);
2713
2714 BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED));
2715
2716recheck:
2717 if (lockres->l_flags & OCFS2_LOCK_BUSY) {
d680efe9 2718 ctl->requeue = 1;
ccd979bd
MF		 2719 ret = ocfs2_prepare_cancel_convert(osb, lockres);
2720 spin_unlock_irqrestore(&lockres->l_lock, flags);
2721 if (ret) {
2722 ret = ocfs2_cancel_convert(osb, lockres);
2723 if (ret < 0)
2724 mlog_errno(ret);
2725 }
2726 goto leave;
2727 }
2728
2729 /* if we're blocking an exclusive and we have *any* holders,
2730 * then requeue. */
2731 if ((lockres->l_blocking == LKM_EXMODE)
2732 && (lockres->l_ex_holders || lockres->l_ro_holders)) {
2733 spin_unlock_irqrestore(&lockres->l_lock, flags);
d680efe9 2734 ctl->requeue = 1;
ccd979bd
MF		 2735 ret = 0;
2736 goto leave;
2737 }
2738
2739 /* If it's a PR we're blocking, then only
2740 * requeue if we've got any EX holders */
2741 if (lockres->l_blocking == LKM_PRMODE &&
2742 lockres->l_ex_holders) {
2743 spin_unlock_irqrestore(&lockres->l_lock, flags);
d680efe9 2744 ctl->requeue = 1;
ccd979bd
MF		 2745 ret = 0;
2746 goto leave;
2747 }
2748
2749 /* If we get here, then we know that there are no more
2750 * incompatible holders (and anyone asking for an incompatible
2751 * lock is blocked). We can now downconvert the lock */
2752 if (!worker)
2753 goto downconvert;
2754
2755 /* Some lockres types want to do a bit of work before
2756 * downconverting a lock. Allow that here. The worker function
2757 * may sleep, so we save off a copy of what we're blocking as
2758 * it may change while we're not holding the spin lock. */
2759 blocking = lockres->l_blocking;
2760 spin_unlock_irqrestore(&lockres->l_lock, flags);
2761
d680efe9
MF		 2762 ctl->unblock_action = worker(lockres, blocking);
2763
2764 if (ctl->unblock_action == UNBLOCK_STOP_POST)
2765 goto leave;
ccd979bd
MF		 2766
2767 spin_lock_irqsave(&lockres->l_lock, flags);
2768 if (blocking != lockres->l_blocking) {
2769 /* If this changed underneath us, then we can't drop
2770 * it just yet. */
2771 goto recheck;
2772 }
2773
2774downconvert:
d680efe9 2775 ctl->requeue = 0;
ccd979bd
MF		 2776 new_level = ocfs2_highest_compat_lock_level(lockres->l_blocking);
2777
2778 ocfs2_prepare_downconvert(lockres, new_level);
2779 spin_unlock_irqrestore(&lockres->l_lock, flags);
2780 ret = ocfs2_downconvert_lock(osb, lockres, new_level, 0);
2781leave:
2782 mlog_exit(ret);
2783 return ret;
2784}
2785
d680efe9
MF		 2786static int ocfs2_data_convert_worker(struct ocfs2_lock_res *lockres,
2787 int blocking)
ccd979bd
MF		 2788{
2789 struct inode *inode;
2790 struct address_space *mapping;
2791
ccd979bd
MF		 2792 inode = ocfs2_lock_res_inode(lockres);
2793 mapping = inode->i_mapping;
2794
2795 if (filemap_fdatawrite(mapping)) {
b0697053
MF		 2796 mlog(ML_ERROR, "Could not sync inode %llu for downconvert!",
2797 (unsigned long long)OCFS2_I(inode)->ip_blkno);
ccd979bd
MF		 2798 }
2799 sync_mapping_buffers(mapping);
2800 if (blocking == LKM_EXMODE) {
2801 truncate_inode_pages(mapping, 0);
2802 unmap_mapping_range(mapping, 0, 0, 0);
2803 } else {
2804 /* We only need to wait on the I/O if we're not also
2805 * truncating pages because truncate_inode_pages waits
2806 * for us above. We don't truncate pages if we're
2807 * blocking anything < EXMODE because we want to keep
2808 * them around in that case. */
2809 filemap_fdatawait(mapping);
2810 }
2811
d680efe9 2812 return UNBLOCK_CONTINUE;
ccd979bd
MF		 2813}
2814
2815int ocfs2_unblock_data(struct ocfs2_lock_res *lockres,
d680efe9 2816 struct ocfs2_unblock_ctl *ctl)
ccd979bd
MF		 2817{
2818 int status;
2819 struct inode *inode;
2820 struct ocfs2_super *osb;
2821
2822 mlog_entry_void();
2823
2824 inode = ocfs2_lock_res_inode(lockres);
2825 osb = OCFS2_SB(inode->i_sb);
2826
b0697053
MF		 2827 mlog(0, "unblock inode %llu\n",
2828 (unsigned long long)OCFS2_I(inode)->ip_blkno);
ccd979bd 2829
d680efe9 2830 status = ocfs2_generic_unblock_lock(osb, lockres, ctl,
ccd979bd
MF		 2831 ocfs2_data_convert_worker);
2832 if (status < 0)
2833 mlog_errno(status);
2834
b0697053 2835 mlog(0, "inode %llu, requeue = %d\n",
d680efe9 2836 (unsigned long long)OCFS2_I(inode)->ip_blkno, ctl->requeue);
ccd979bd
MF		 2837
2838 mlog_exit(status);
2839 return status;
2840}
2841
2842static int ocfs2_unblock_inode_lock(struct ocfs2_lock_res *lockres,
d680efe9 2843 struct ocfs2_unblock_ctl *ctl)
ccd979bd
MF		 2844{
2845 int status;
2846 struct inode *inode;
2847
2848 mlog_entry_void();
2849
2850 mlog(0, "Unblock lockres %s\n", lockres->l_name);
2851
2852 inode = ocfs2_lock_res_inode(lockres);
2853
2854 status = ocfs2_generic_unblock_lock(OCFS2_SB(inode->i_sb),
d680efe9 2855 lockres, ctl, NULL);
ccd979bd
MF		 2856 if (status < 0)
2857 mlog_errno(status);
2858
2859 mlog_exit(status);
2860 return status;
2861}
2862
d680efe9
MF		 2863static int ocfs2_unblock_meta(struct ocfs2_lock_res *lockres,
2864 struct ocfs2_unblock_ctl *ctl)
ccd979bd
MF		 2865{
2866 int status;
2867 struct inode *inode;
2868
2869 mlog_entry_void();
2870
2871 inode = ocfs2_lock_res_inode(lockres);
2872
b0697053
MF		 2873 mlog(0, "unblock inode %llu\n",
2874 (unsigned long long)OCFS2_I(inode)->ip_blkno);
ccd979bd 2875
d680efe9 2876 status = ocfs2_do_unblock_meta(inode, &ctl->requeue);
ccd979bd
MF		 2877 if (status < 0)
2878 mlog_errno(status);
2879
b0697053 2880 mlog(0, "inode %llu, requeue = %d\n",
d680efe9 2881 (unsigned long long)OCFS2_I(inode)->ip_blkno, ctl->requeue);
ccd979bd
MF		 2882
2883 mlog_exit(status);
2884 return status;
2885}
2886
d680efe9
MF		 2887/*
2888 * Does the final reference drop on our dentry lock. Right now this
2889 * happens in the vote thread, but we could choose to simplify the
2890 * dlmglue API and push these off to the ocfs2_wq in the future.
2891 */
2892static void ocfs2_dentry_post_unlock(struct ocfs2_super *osb,
2893 struct ocfs2_lock_res *lockres)
2894{
2895 struct ocfs2_dentry_lock *dl = ocfs2_lock_res_dl(lockres);
2896 ocfs2_dentry_lock_put(osb, dl);
2897}
2898
2899/*
2900 * d_delete() matching dentries before the lock downconvert.
2901 *
2902 * At this point, any process waiting to destroy the
2903 * dentry_lock due to last ref count is stopped by the
2904 * OCFS2_LOCK_QUEUED flag.
2905 *
2906 * We have two potential problems
2907 *
2908 * 1) If we do the last reference drop on our dentry_lock (via dput)
2909 * we'll wind up in ocfs2_release_dentry_lock(), waiting on
2910 * the downconvert to finish. Instead we take an elevated
2911 * reference and push the drop until after we've completed our
2912 * unblock processing.
2913 *
2914 * 2) There might be another process with a final reference,
2915 * waiting on us to finish processing. If this is the case, we
2916 * detect it and exit out - there's no more dentries anyway.
2917 */
2918static int ocfs2_dentry_convert_worker(struct ocfs2_lock_res *lockres,
2919 int blocking)
2920{
2921 struct ocfs2_dentry_lock *dl = ocfs2_lock_res_dl(lockres);
2922 struct ocfs2_inode_info *oi = OCFS2_I(dl->dl_inode);
2923 struct dentry *dentry;
2924 unsigned long flags;
2925 int extra_ref = 0;
2926
2927 /*
2928 * This node is blocking another node from getting a read
2929 * lock. This happens when we've renamed within a
2930 * directory. We've forced the other nodes to d_delete(), but
2931 * we never actually dropped our lock because it's still
2932 * valid. The downconvert code will retain a PR for this node,
2933 * so there's no further work to do.
2934 */
2935 if (blocking == LKM_PRMODE)
2936 return UNBLOCK_CONTINUE;
2937
2938 /*
2939 * Mark this inode as potentially orphaned. The code in
2940 * ocfs2_delete_inode() will figure out whether it actually
2941 * needs to be freed or not.
2942 */
2943 spin_lock(&oi->ip_lock);
2944 oi->ip_flags |= OCFS2_INODE_MAYBE_ORPHANED;
2945 spin_unlock(&oi->ip_lock);
2946
2947 /*
2948 * Yuck. We need to make sure however that the check of
2949 * OCFS2_LOCK_FREEING and the extra reference are atomic with
2950 * respect to a reference decrement or the setting of that
2951 * flag.
2952 */
2953 spin_lock_irqsave(&lockres->l_lock, flags);
2954 spin_lock(&dentry_attach_lock);
2955 if (!(lockres->l_flags & OCFS2_LOCK_FREEING)
2956 && dl->dl_count) {
2957 dl->dl_count++;
2958 extra_ref = 1;
2959 }
2960 spin_unlock(&dentry_attach_lock);
2961 spin_unlock_irqrestore(&lockres->l_lock, flags);
2962
2963 mlog(0, "extra_ref = %d\n", extra_ref);
2964
2965 /*
2966 * We have a process waiting on us in ocfs2_dentry_iput(),
2967 * which means we can't have any more outstanding
2968 * aliases. There's no need to do any more work.
2969 */
2970 if (!extra_ref)
2971 return UNBLOCK_CONTINUE;
2972
2973 spin_lock(&dentry_attach_lock);
2974 while (1) {
2975 dentry = ocfs2_find_local_alias(dl->dl_inode,
2976 dl->dl_parent_blkno, 1);
2977 if (!dentry)
2978 break;
2979 spin_unlock(&dentry_attach_lock);
2980
2981 mlog(0, "d_delete(%.*s);\n", dentry->d_name.len,
2982 dentry->d_name.name);
2983
2984 /*
2985 * The following dcache calls may do an
2986 * iput(). Normally we don't want that from the
2987 * downconverting thread, but in this case it's ok
2988 * because the requesting node already has an
2989 * exclusive lock on the inode, so it can't be queued
2990 * for a downconvert.
2991 */
2992 d_delete(dentry);
2993 dput(dentry);
2994
2995 spin_lock(&dentry_attach_lock);
2996 }
2997 spin_unlock(&dentry_attach_lock);
2998
2999 /*
3000 * If we are the last holder of this dentry lock, there is no
3001 * reason to downconvert so skip straight to the unlock.
3002 */
3003 if (dl->dl_count == 1)
3004 return UNBLOCK_STOP_POST;
3005
3006 return UNBLOCK_CONTINUE_POST;
3007}
3008
3009static int ocfs2_unblock_dentry_lock(struct ocfs2_lock_res *lockres,
3010 struct ocfs2_unblock_ctl *ctl)
3011{
3012 int ret;
3013 struct ocfs2_dentry_lock *dl = ocfs2_lock_res_dl(lockres);
3014 struct ocfs2_super *osb = OCFS2_SB(dl->dl_inode->i_sb);
3015
3016 mlog(0, "unblock dentry lock: %llu\n",
3017 (unsigned long long)OCFS2_I(dl->dl_inode)->ip_blkno);
3018
3019 ret = ocfs2_generic_unblock_lock(osb,
3020 lockres,
3021 ctl,
3022 ocfs2_dentry_convert_worker);
3023 if (ret < 0)
3024 mlog_errno(ret);
3025
3026 mlog(0, "requeue = %d, post = %d\n", ctl->requeue, ctl->unblock_action);
3027
3028 return ret;
3029}
3030
ccd979bd
MF		 3031/* Generic unblock function for any lockres whose private data is an
3032 * ocfs2_super pointer. */
3033static int ocfs2_unblock_osb_lock(struct ocfs2_lock_res *lockres,
d680efe9 3034 struct ocfs2_unblock_ctl *ctl)
ccd979bd
MF		 3035{
3036 int status;
3037 struct ocfs2_super *osb;
3038
3039 mlog_entry_void();
3040
3041 mlog(0, "Unblock lockres %s\n", lockres->l_name);
3042
3043 osb = ocfs2_lock_res_super(lockres);
3044
3045 status = ocfs2_generic_unblock_lock(osb,
3046 lockres,
d680efe9 3047 ctl,
ccd979bd
MF		 3048 NULL);
3049 if (status < 0)
3050 mlog_errno(status);
3051
3052 mlog_exit(status);
3053 return status;
3054}
3055
3056void ocfs2_process_blocked_lock(struct ocfs2_super *osb,
3057 struct ocfs2_lock_res *lockres)
3058{
3059 int status;
d680efe9 3060 struct ocfs2_unblock_ctl ctl = {0, 0,};
ccd979bd
MF		 3061 unsigned long flags;
3062
3063 /* Our reference to the lockres in this function can be
3064 * considered valid until we remove the OCFS2_LOCK_QUEUED
3065 * flag. */
3066
3067 mlog_entry_void();
3068
3069 BUG_ON(!lockres);
3070 BUG_ON(!lockres->l_ops);
3071 BUG_ON(!lockres->l_ops->unblock);
3072
3073 mlog(0, "lockres %s blocked.\n", lockres->l_name);
3074
3075 /* Detect whether a lock has been marked as going away while
3076 * the vote thread was processing other things. A lock can
3077 * still be marked with OCFS2_LOCK_FREEING after this check,
3078 * but short circuiting here will still save us some
3079 * performance. */
3080 spin_lock_irqsave(&lockres->l_lock, flags);
3081 if (lockres->l_flags & OCFS2_LOCK_FREEING)
3082 goto unqueue;
3083 spin_unlock_irqrestore(&lockres->l_lock, flags);
3084
d680efe9 3085 status = lockres->l_ops->unblock(lockres, &ctl);
ccd979bd
MF		 3086 if (status < 0)
3087 mlog_errno(status);
3088
3089 spin_lock_irqsave(&lockres->l_lock, flags);
3090unqueue:
d680efe9 3091 if (lockres->l_flags & OCFS2_LOCK_FREEING || !ctl.requeue) {
ccd979bd
MF		 3092 lockres_clear_flags(lockres, OCFS2_LOCK_QUEUED);
3093 } else
3094 ocfs2_schedule_blocked_lock(osb, lockres);
3095
3096 mlog(0, "lockres %s, requeue = %s.\n", lockres->l_name,
d680efe9 3097 ctl.requeue ? "yes" : "no");
ccd979bd
MF		 3098 spin_unlock_irqrestore(&lockres->l_lock, flags);
3099
d680efe9
MF		 3100 if (ctl.unblock_action != UNBLOCK_CONTINUE
3101 && lockres->l_ops->post_unlock)
3102 lockres->l_ops->post_unlock(osb, lockres);
3103
ccd979bd
MF		 3104 mlog_exit_void();
3105}
3106
3107static void ocfs2_schedule_blocked_lock(struct ocfs2_super *osb,
3108 struct ocfs2_lock_res *lockres)
3109{
3110 mlog_entry_void();
3111
3112 assert_spin_locked(&lockres->l_lock);
3113
3114 if (lockres->l_flags & OCFS2_LOCK_FREEING) {
3115 /* Do not schedule a lock for downconvert when it's on
3116 * the way to destruction - any nodes wanting access
3117 * to the resource will get it soon. */
3118 mlog(0, "Lockres %s won't be scheduled: flags 0x%lx\n",
3119 lockres->l_name, lockres->l_flags);
3120 return;
3121 }
3122
3123 lockres_or_flags(lockres, OCFS2_LOCK_QUEUED);
3124
3125 spin_lock(&osb->vote_task_lock);
3126 if (list_empty(&lockres->l_blocked_list)) {
3127 list_add_tail(&lockres->l_blocked_list,
3128 &osb->blocked_lock_list);
3129 osb->blocked_lock_count++;
3130 }
3131 spin_unlock(&osb->vote_task_lock);
3132
3133 mlog_exit_void();
3134}
3135
3136/* This aids in debugging situations where a bad LVB might be involved. */
3137void ocfs2_dump_meta_lvb_info(u64 level,
3138 const char *function,
3139 unsigned int line,
3140 struct ocfs2_lock_res *lockres)
3141{
3142 struct ocfs2_meta_lvb *lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb;
3143
3144 mlog(level, "LVB information for %s (called from %s:%u):\n",
3145 lockres->l_name, function, line);
f9e2d82e
MF		 3146 mlog(level, "version: %u, clusters: %u, generation: 0x%x\n",
3147 lvb->lvb_version, be32_to_cpu(lvb->lvb_iclusters),
3148 be32_to_cpu(lvb->lvb_igeneration));
b0697053
MF		 3149 mlog(level, "size: %llu, uid %u, gid %u, mode 0x%x\n",
3150 (unsigned long long)be64_to_cpu(lvb->lvb_isize),
3151 be32_to_cpu(lvb->lvb_iuid), be32_to_cpu(lvb->lvb_igid),
3152 be16_to_cpu(lvb->lvb_imode));
3153 mlog(level, "nlink %u, atime_packed 0x%llx, ctime_packed 0x%llx, "
ca4d147e 3154 "mtime_packed 0x%llx iattr 0x%x\n", be16_to_cpu(lvb->lvb_inlink),
b0697053
MF		 3155 (long long)be64_to_cpu(lvb->lvb_iatime_packed),
3156 (long long)be64_to_cpu(lvb->lvb_ictime_packed),
ca4d147e
HP		 3157 (long long)be64_to_cpu(lvb->lvb_imtime_packed),
3158 be32_to_cpu(lvb->lvb_iattr));
ccd979bd 3159}
kernel source for telekom puls (alcatel/mediatek)