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ocfs2: Remove fs dependency on ocfs2_heartbeat module
[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>
ccd979bd
MF		 30#include <linux/crc32.h>
31#include <linux/kthread.h>
32#include <linux/pagemap.h>
33#include <linux/debugfs.h>
34#include <linux/seq_file.h>
35
36#include <cluster/heartbeat.h>
37#include <cluster/nodemanager.h>
38#include <cluster/tcp.h>
39
40#include <dlm/dlmapi.h>
41
42#define MLOG_MASK_PREFIX ML_DLM_GLUE
43#include <cluster/masklog.h>
44
45#include "ocfs2.h"
46
47#include "alloc.h"
d680efe9 48#include "dcache.h"
ccd979bd
MF		 49#include "dlmglue.h"
50#include "extent_map.h"
7f1a37e3 51#include "file.h"
ccd979bd
MF		 52#include "heartbeat.h"
53#include "inode.h"
54#include "journal.h"
55#include "slot_map.h"
56#include "super.h"
57#include "uptodate.h"
58#include "vote.h"
59
60#include "buffer_head_io.h"
61
62struct ocfs2_mask_waiter {
63 struct list_head mw_item;
64 int mw_status;
65 struct completion mw_complete;
66 unsigned long mw_mask;
67 unsigned long mw_goal;
68};
69
54a7e755
MF		 70static struct ocfs2_super *ocfs2_get_dentry_osb(struct ocfs2_lock_res *lockres);
71static struct ocfs2_super *ocfs2_get_inode_osb(struct ocfs2_lock_res *lockres);
ccd979bd 72
d680efe9 73/*
cc567d89 74 * Return value from ->downconvert_worker functions.
d680efe9 75 *
b5e500e2 76 * These control the precise actions of ocfs2_unblock_lock()
d680efe9
MF		 77 * and ocfs2_process_blocked_lock()
78 *
79 */
80enum ocfs2_unblock_action {
81 UNBLOCK_CONTINUE = 0, /* Continue downconvert */
82 UNBLOCK_CONTINUE_POST = 1, /* Continue downconvert, fire
83 * ->post_unlock callback */
84 UNBLOCK_STOP_POST = 2, /* Do not downconvert, fire
85 * ->post_unlock() callback. */
86};
87
88struct ocfs2_unblock_ctl {
89 int requeue;
90 enum ocfs2_unblock_action unblock_action;
91};
92
810d5aeb
MF		 93static int ocfs2_check_meta_downconvert(struct ocfs2_lock_res *lockres,
94 int new_level);
95static void ocfs2_set_meta_lvb(struct ocfs2_lock_res *lockres);
96
cc567d89
MF		 97static int ocfs2_data_convert_worker(struct ocfs2_lock_res *lockres,
98 int blocking);
99
cc567d89
MF		 100static int ocfs2_dentry_convert_worker(struct ocfs2_lock_res *lockres,
101 int blocking);
d680efe9
MF		 102
103static void ocfs2_dentry_post_unlock(struct ocfs2_super *osb,
104 struct ocfs2_lock_res *lockres);
ccd979bd 105
6cb129f5
AB		 106
107#define mlog_meta_lvb(__level, __lockres) ocfs2_dump_meta_lvb_info(__level, __PRETTY_FUNCTION__, __LINE__, __lockres)
108
109/* This aids in debugging situations where a bad LVB might be involved. */
110static void ocfs2_dump_meta_lvb_info(u64 level,
111 const char *function,
112 unsigned int line,
113 struct ocfs2_lock_res *lockres)
114{
115 struct ocfs2_meta_lvb *lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb;
116
117 mlog(level, "LVB information for %s (called from %s:%u):\n",
118 lockres->l_name, function, line);
119 mlog(level, "version: %u, clusters: %u, generation: 0x%x\n",
120 lvb->lvb_version, be32_to_cpu(lvb->lvb_iclusters),
121 be32_to_cpu(lvb->lvb_igeneration));
122 mlog(level, "size: %llu, uid %u, gid %u, mode 0x%x\n",
123 (unsigned long long)be64_to_cpu(lvb->lvb_isize),
124 be32_to_cpu(lvb->lvb_iuid), be32_to_cpu(lvb->lvb_igid),
125 be16_to_cpu(lvb->lvb_imode));
126 mlog(level, "nlink %u, atime_packed 0x%llx, ctime_packed 0x%llx, "
127 "mtime_packed 0x%llx iattr 0x%x\n", be16_to_cpu(lvb->lvb_inlink),
128 (long long)be64_to_cpu(lvb->lvb_iatime_packed),
129 (long long)be64_to_cpu(lvb->lvb_ictime_packed),
130 (long long)be64_to_cpu(lvb->lvb_imtime_packed),
131 be32_to_cpu(lvb->lvb_iattr));
132}
133
134
f625c979
MF		 135/*
136 * OCFS2 Lock Resource Operations
137 *
138 * These fine tune the behavior of the generic dlmglue locking infrastructure.
0d5dc6c2
MF		 139 *
140 * The most basic of lock types can point ->l_priv to their respective
141 * struct ocfs2_super and allow the default actions to manage things.
142 *
143 * Right now, each lock type also needs to implement an init function,
144 * and trivial lock/unlock wrappers. ocfs2_simple_drop_lockres()
145 * should be called when the lock is no longer needed (i.e., object
146 * destruction time).
f625c979 147 */
ccd979bd 148struct ocfs2_lock_res_ops {
54a7e755
MF		 149 /*
150 * Translate an ocfs2_lock_res * into an ocfs2_super *. Define
151 * this callback if ->l_priv is not an ocfs2_super pointer
152 */
153 struct ocfs2_super * (*get_osb)(struct ocfs2_lock_res *);
b5e500e2 154
0d5dc6c2
MF		 155 /*
156 * Optionally called in the downconvert (or "vote") thread
157 * after a successful downconvert. The lockres will not be
158 * referenced after this callback is called, so it is safe to
159 * free memory, etc.
160 *
161 * The exact semantics of when this is called are controlled
162 * by ->downconvert_worker()
163 */
d680efe9 164 void (*post_unlock)(struct ocfs2_super *, struct ocfs2_lock_res *);
f625c979 165
16d5b956
MF		 166 /*
167 * Allow a lock type to add checks to determine whether it is
168 * safe to downconvert a lock. Return 0 to re-queue the
169 * downconvert at a later time, nonzero to continue.
170 *
171 * For most locks, the default checks that there are no
172 * incompatible holders are sufficient.
173 *
174 * Called with the lockres spinlock held.
175 */
176 int (*check_downconvert)(struct ocfs2_lock_res *, int);
177
5ef0d4ea
MF		 178 /*
179 * Allows a lock type to populate the lock value block. This
180 * is called on downconvert, and when we drop a lock.
181 *
182 * Locks that want to use this should set LOCK_TYPE_USES_LVB
183 * in the flags field.
184 *
185 * Called with the lockres spinlock held.
186 */
187 void (*set_lvb)(struct ocfs2_lock_res *);
188
cc567d89
MF		 189 /*
190 * Called from the downconvert thread when it is determined
191 * that a lock will be downconverted. This is called without
192 * any locks held so the function can do work that might
193 * schedule (syncing out data, etc).
194 *
195 * This should return any one of the ocfs2_unblock_action
196 * values, depending on what it wants the thread to do.
197 */
198 int (*downconvert_worker)(struct ocfs2_lock_res *, int);
199
f625c979
MF		 200 /*
201 * LOCK_TYPE_* flags which describe the specific requirements
202 * of a lock type. Descriptions of each individual flag follow.
203 */
204 int flags;
ccd979bd
MF		 205};
206
f625c979
MF		 207/*
208 * Some locks want to "refresh" potentially stale data when a
209 * meaningful (PRMODE or EXMODE) lock level is first obtained. If this
210 * flag is set, the OCFS2_LOCK_NEEDS_REFRESH flag will be set on the
211 * individual lockres l_flags member from the ast function. It is
212 * expected that the locking wrapper will clear the
213 * OCFS2_LOCK_NEEDS_REFRESH flag when done.
214 */
215#define LOCK_TYPE_REQUIRES_REFRESH 0x1
216
b80fc012 217/*
5ef0d4ea
MF		 218 * Indicate that a lock type makes use of the lock value block. The
219 * ->set_lvb lock type callback must be defined.
b80fc012
MF		 220 */
221#define LOCK_TYPE_USES_LVB 0x2
222
ccd979bd 223static struct ocfs2_lock_res_ops ocfs2_inode_rw_lops = {
54a7e755 224 .get_osb = ocfs2_get_inode_osb,
f625c979 225 .flags = 0,
ccd979bd
MF		 226};
227
228static struct ocfs2_lock_res_ops ocfs2_inode_meta_lops = {
54a7e755 229 .get_osb = ocfs2_get_inode_osb,
810d5aeb
MF		 230 .check_downconvert = ocfs2_check_meta_downconvert,
231 .set_lvb = ocfs2_set_meta_lvb,
b80fc012 232 .flags = LOCK_TYPE_REQUIRES_REFRESH|LOCK_TYPE_USES_LVB,
ccd979bd
MF		 233};
234
ccd979bd 235static struct ocfs2_lock_res_ops ocfs2_inode_data_lops = {
54a7e755 236 .get_osb = ocfs2_get_inode_osb,
cc567d89 237 .downconvert_worker = ocfs2_data_convert_worker,
f625c979 238 .flags = 0,
ccd979bd
MF		 239};
240
241static struct ocfs2_lock_res_ops ocfs2_super_lops = {
f625c979 242 .flags = LOCK_TYPE_REQUIRES_REFRESH,
ccd979bd
MF		 243};
244
245static struct ocfs2_lock_res_ops ocfs2_rename_lops = {
f625c979 246 .flags = 0,
ccd979bd
MF		 247};
248
d680efe9 249static struct ocfs2_lock_res_ops ocfs2_dentry_lops = {
54a7e755 250 .get_osb = ocfs2_get_dentry_osb,
d680efe9 251 .post_unlock = ocfs2_dentry_post_unlock,
cc567d89 252 .downconvert_worker = ocfs2_dentry_convert_worker,
f625c979 253 .flags = 0,
d680efe9
MF		 254};
255
50008630
TY		 256static struct ocfs2_lock_res_ops ocfs2_inode_open_lops = {
257 .get_osb = ocfs2_get_inode_osb,
258 .flags = 0,
259};
260
ccd979bd
MF		 261static inline int ocfs2_is_inode_lock(struct ocfs2_lock_res *lockres)
262{
263 return lockres->l_type == OCFS2_LOCK_TYPE_META ||
264 lockres->l_type == OCFS2_LOCK_TYPE_DATA ||
50008630
TY		 265 lockres->l_type == OCFS2_LOCK_TYPE_RW ||
266 lockres->l_type == OCFS2_LOCK_TYPE_OPEN;
ccd979bd
MF		 267}
268
ccd979bd
MF		 269static inline struct inode *ocfs2_lock_res_inode(struct ocfs2_lock_res *lockres)
270{
271 BUG_ON(!ocfs2_is_inode_lock(lockres));
272
273 return (struct inode *) lockres->l_priv;
274}
275
d680efe9
MF		 276static inline struct ocfs2_dentry_lock *ocfs2_lock_res_dl(struct ocfs2_lock_res *lockres)
277{
278 BUG_ON(lockres->l_type != OCFS2_LOCK_TYPE_DENTRY);
279
280 return (struct ocfs2_dentry_lock *)lockres->l_priv;
281}
282
54a7e755
MF		 283static inline struct ocfs2_super *ocfs2_get_lockres_osb(struct ocfs2_lock_res *lockres)
284{
285 if (lockres->l_ops->get_osb)
286 return lockres->l_ops->get_osb(lockres);
287
288 return (struct ocfs2_super *)lockres->l_priv;
289}
290
ccd979bd
MF		 291static int ocfs2_lock_create(struct ocfs2_super *osb,
292 struct ocfs2_lock_res *lockres,
293 int level,
294 int dlm_flags);
295static inline int ocfs2_may_continue_on_blocked_lock(struct ocfs2_lock_res *lockres,
296 int wanted);
297static void ocfs2_cluster_unlock(struct ocfs2_super *osb,
298 struct ocfs2_lock_res *lockres,
299 int level);
300static inline void ocfs2_generic_handle_downconvert_action(struct ocfs2_lock_res *lockres);
301static inline void ocfs2_generic_handle_convert_action(struct ocfs2_lock_res *lockres);
302static inline void ocfs2_generic_handle_attach_action(struct ocfs2_lock_res *lockres);
303static int ocfs2_generic_handle_bast(struct ocfs2_lock_res *lockres, int level);
304static void ocfs2_schedule_blocked_lock(struct ocfs2_super *osb,
305 struct ocfs2_lock_res *lockres);
306static inline void ocfs2_recover_from_dlm_error(struct ocfs2_lock_res *lockres,
307 int convert);
308#define ocfs2_log_dlm_error(_func, _stat, _lockres) do { \
309 mlog(ML_ERROR, "Dlm error \"%s\" while calling %s on " \
310 "resource %s: %s\n", dlm_errname(_stat), _func, \
311 _lockres->l_name, dlm_errmsg(_stat)); \
312} while (0)
313static void ocfs2_vote_on_unlock(struct ocfs2_super *osb,
314 struct ocfs2_lock_res *lockres);
315static int ocfs2_meta_lock_update(struct inode *inode,
316 struct buffer_head **bh);
317static void ocfs2_drop_osb_locks(struct ocfs2_super *osb);
318static inline int ocfs2_highest_compat_lock_level(int level);
ccd979bd 319
ccd979bd
MF		 320static void ocfs2_build_lock_name(enum ocfs2_lock_type type,
321 u64 blkno,
322 u32 generation,
323 char *name)
324{
325 int len;
326
327 mlog_entry_void();
328
329 BUG_ON(type >= OCFS2_NUM_LOCK_TYPES);
330
b0697053
MF		 331 len = snprintf(name, OCFS2_LOCK_ID_MAX_LEN, "%c%s%016llx%08x",
332 ocfs2_lock_type_char(type), OCFS2_LOCK_ID_PAD,
333 (long long)blkno, generation);
ccd979bd
MF		 334
335 BUG_ON(len != (OCFS2_LOCK_ID_MAX_LEN - 1));
336
337 mlog(0, "built lock resource with name: %s\n", name);
338
339 mlog_exit_void();
340}
341
34af946a 342static DEFINE_SPINLOCK(ocfs2_dlm_tracking_lock);
ccd979bd
MF		 343
344static void ocfs2_add_lockres_tracking(struct ocfs2_lock_res *res,
345 struct ocfs2_dlm_debug *dlm_debug)
346{
347 mlog(0, "Add tracking for lockres %s\n", res->l_name);
348
349 spin_lock(&ocfs2_dlm_tracking_lock);
350 list_add(&res->l_debug_list, &dlm_debug->d_lockres_tracking);
351 spin_unlock(&ocfs2_dlm_tracking_lock);
352}
353
354static void ocfs2_remove_lockres_tracking(struct ocfs2_lock_res *res)
355{
356 spin_lock(&ocfs2_dlm_tracking_lock);
357 if (!list_empty(&res->l_debug_list))
358 list_del_init(&res->l_debug_list);
359 spin_unlock(&ocfs2_dlm_tracking_lock);
360}
361
362static void ocfs2_lock_res_init_common(struct ocfs2_super *osb,
363 struct ocfs2_lock_res *res,
364 enum ocfs2_lock_type type,
ccd979bd
MF		 365 struct ocfs2_lock_res_ops *ops,
366 void *priv)
367{
ccd979bd
MF		 368 res->l_type = type;
369 res->l_ops = ops;
370 res->l_priv = priv;
371
372 res->l_level = LKM_IVMODE;
373 res->l_requested = LKM_IVMODE;
374 res->l_blocking = LKM_IVMODE;
375 res->l_action = OCFS2_AST_INVALID;
376 res->l_unlock_action = OCFS2_UNLOCK_INVALID;
377
378 res->l_flags = OCFS2_LOCK_INITIALIZED;
379
380 ocfs2_add_lockres_tracking(res, osb->osb_dlm_debug);
381}
382
383void ocfs2_lock_res_init_once(struct ocfs2_lock_res *res)
384{
385 /* This also clears out the lock status block */
386 memset(res, 0, sizeof(struct ocfs2_lock_res));
387 spin_lock_init(&res->l_lock);
388 init_waitqueue_head(&res->l_event);
389 INIT_LIST_HEAD(&res->l_blocked_list);
390 INIT_LIST_HEAD(&res->l_mask_waiters);
391}
392
393void ocfs2_inode_lock_res_init(struct ocfs2_lock_res *res,
394 enum ocfs2_lock_type type,
24c19ef4 395 unsigned int generation,
ccd979bd
MF		 396 struct inode *inode)
397{
398 struct ocfs2_lock_res_ops *ops;
399
400 switch(type) {
401 case OCFS2_LOCK_TYPE_RW:
402 ops = &ocfs2_inode_rw_lops;
403 break;
404 case OCFS2_LOCK_TYPE_META:
405 ops = &ocfs2_inode_meta_lops;
406 break;
407 case OCFS2_LOCK_TYPE_DATA:
408 ops = &ocfs2_inode_data_lops;
409 break;
50008630
TY		 410 case OCFS2_LOCK_TYPE_OPEN:
411 ops = &ocfs2_inode_open_lops;
412 break;
ccd979bd
MF		 413 default:
414 mlog_bug_on_msg(1, "type: %d\n", type);
415 ops = NULL; /* thanks, gcc */
416 break;
417 };
418
d680efe9 419 ocfs2_build_lock_name(type, OCFS2_I(inode)->ip_blkno,
24c19ef4 420 generation, res->l_name);
d680efe9
MF		 421 ocfs2_lock_res_init_common(OCFS2_SB(inode->i_sb), res, type, ops, inode);
422}
423
54a7e755
MF		 424static struct ocfs2_super *ocfs2_get_inode_osb(struct ocfs2_lock_res *lockres)
425{
426 struct inode *inode = ocfs2_lock_res_inode(lockres);
427
428 return OCFS2_SB(inode->i_sb);
429}
430
d680efe9
MF		 431static __u64 ocfs2_get_dentry_lock_ino(struct ocfs2_lock_res *lockres)
432{
433 __be64 inode_blkno_be;
434
435 memcpy(&inode_blkno_be, &lockres->l_name[OCFS2_DENTRY_LOCK_INO_START],
436 sizeof(__be64));
437
438 return be64_to_cpu(inode_blkno_be);
439}
440
54a7e755
MF		 441static struct ocfs2_super *ocfs2_get_dentry_osb(struct ocfs2_lock_res *lockres)
442{
443 struct ocfs2_dentry_lock *dl = lockres->l_priv;
444
445 return OCFS2_SB(dl->dl_inode->i_sb);
446}
447
d680efe9
MF		 448void ocfs2_dentry_lock_res_init(struct ocfs2_dentry_lock *dl,
449 u64 parent, struct inode *inode)
450{
451 int len;
452 u64 inode_blkno = OCFS2_I(inode)->ip_blkno;
453 __be64 inode_blkno_be = cpu_to_be64(inode_blkno);
454 struct ocfs2_lock_res *lockres = &dl->dl_lockres;
455
456 ocfs2_lock_res_init_once(lockres);
457
458 /*
459 * Unfortunately, the standard lock naming scheme won't work
460 * here because we have two 16 byte values to use. Instead,
461 * we'll stuff the inode number as a binary value. We still
462 * want error prints to show something without garbling the
463 * display, so drop a null byte in there before the inode
464 * number. A future version of OCFS2 will likely use all
465 * binary lock names. The stringified names have been a
466 * tremendous aid in debugging, but now that the debugfs
467 * interface exists, we can mangle things there if need be.
468 *
469 * NOTE: We also drop the standard "pad" value (the total lock
470 * name size stays the same though - the last part is all
471 * zeros due to the memset in ocfs2_lock_res_init_once()
472 */
473 len = snprintf(lockres->l_name, OCFS2_DENTRY_LOCK_INO_START,
474 "%c%016llx",
475 ocfs2_lock_type_char(OCFS2_LOCK_TYPE_DENTRY),
476 (long long)parent);
477
478 BUG_ON(len != (OCFS2_DENTRY_LOCK_INO_START - 1));
479
480 memcpy(&lockres->l_name[OCFS2_DENTRY_LOCK_INO_START], &inode_blkno_be,
481 sizeof(__be64));
482
483 ocfs2_lock_res_init_common(OCFS2_SB(inode->i_sb), lockres,
484 OCFS2_LOCK_TYPE_DENTRY, &ocfs2_dentry_lops,
485 dl);
ccd979bd
MF		 486}
487
488static void ocfs2_super_lock_res_init(struct ocfs2_lock_res *res,
489 struct ocfs2_super *osb)
490{
491 /* Superblock lockres doesn't come from a slab so we call init
492 * once on it manually. */
493 ocfs2_lock_res_init_once(res);
d680efe9
MF		 494 ocfs2_build_lock_name(OCFS2_LOCK_TYPE_SUPER, OCFS2_SUPER_BLOCK_BLKNO,
495 0, res->l_name);
ccd979bd 496 ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_SUPER,
ccd979bd
MF		 497 &ocfs2_super_lops, osb);
498}
499
500static void ocfs2_rename_lock_res_init(struct ocfs2_lock_res *res,
501 struct ocfs2_super *osb)
502{
503 /* Rename lockres doesn't come from a slab so we call init
504 * once on it manually. */
505 ocfs2_lock_res_init_once(res);
d680efe9
MF		 506 ocfs2_build_lock_name(OCFS2_LOCK_TYPE_RENAME, 0, 0, res->l_name);
507 ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_RENAME,
ccd979bd
MF		 508 &ocfs2_rename_lops, osb);
509}
510
511void ocfs2_lock_res_free(struct ocfs2_lock_res *res)
512{
513 mlog_entry_void();
514
515 if (!(res->l_flags & OCFS2_LOCK_INITIALIZED))
516 return;
517
518 ocfs2_remove_lockres_tracking(res);
519
520 mlog_bug_on_msg(!list_empty(&res->l_blocked_list),
521 "Lockres %s is on the blocked list\n",
522 res->l_name);
523 mlog_bug_on_msg(!list_empty(&res->l_mask_waiters),
524 "Lockres %s has mask waiters pending\n",
525 res->l_name);
526 mlog_bug_on_msg(spin_is_locked(&res->l_lock),
527 "Lockres %s is locked\n",
528 res->l_name);
529 mlog_bug_on_msg(res->l_ro_holders,
530 "Lockres %s has %u ro holders\n",
531 res->l_name, res->l_ro_holders);
532 mlog_bug_on_msg(res->l_ex_holders,
533 "Lockres %s has %u ex holders\n",
534 res->l_name, res->l_ex_holders);
535
536 /* Need to clear out the lock status block for the dlm */
537 memset(&res->l_lksb, 0, sizeof(res->l_lksb));
538
539 res->l_flags = 0UL;
540 mlog_exit_void();
541}
542
543static inline void ocfs2_inc_holders(struct ocfs2_lock_res *lockres,
544 int level)
545{
546 mlog_entry_void();
547
548 BUG_ON(!lockres);
549
550 switch(level) {
551 case LKM_EXMODE:
552 lockres->l_ex_holders++;
553 break;
554 case LKM_PRMODE:
555 lockres->l_ro_holders++;
556 break;
557 default:
558 BUG();
559 }
560
561 mlog_exit_void();
562}
563
564static inline void ocfs2_dec_holders(struct ocfs2_lock_res *lockres,
565 int level)
566{
567 mlog_entry_void();
568
569 BUG_ON(!lockres);
570
571 switch(level) {
572 case LKM_EXMODE:
573 BUG_ON(!lockres->l_ex_holders);
574 lockres->l_ex_holders--;
575 break;
576 case LKM_PRMODE:
577 BUG_ON(!lockres->l_ro_holders);
578 lockres->l_ro_holders--;
579 break;
580 default:
581 BUG();
582 }
583 mlog_exit_void();
584}
585
586/* WARNING: This function lives in a world where the only three lock
587 * levels are EX, PR, and NL. It *will* have to be adjusted when more
588 * lock types are added. */
589static inline int ocfs2_highest_compat_lock_level(int level)
590{
591 int new_level = LKM_EXMODE;
592
593 if (level == LKM_EXMODE)
594 new_level = LKM_NLMODE;
595 else if (level == LKM_PRMODE)
596 new_level = LKM_PRMODE;
597 return new_level;
598}
599
600static void lockres_set_flags(struct ocfs2_lock_res *lockres,
601 unsigned long newflags)
602{
800deef3 603 struct ocfs2_mask_waiter *mw, *tmp;
ccd979bd
MF		 604
605 assert_spin_locked(&lockres->l_lock);
606
607 lockres->l_flags = newflags;
608
800deef3 609 list_for_each_entry_safe(mw, tmp, &lockres->l_mask_waiters, mw_item) {
ccd979bd
MF		 610 if ((lockres->l_flags & mw->mw_mask) != mw->mw_goal)
611 continue;
612
613 list_del_init(&mw->mw_item);
614 mw->mw_status = 0;
615 complete(&mw->mw_complete);
616 }
617}
618static void lockres_or_flags(struct ocfs2_lock_res *lockres, unsigned long or)
619{
620 lockres_set_flags(lockres, lockres->l_flags | or);
621}
622static void lockres_clear_flags(struct ocfs2_lock_res *lockres,
623 unsigned long clear)
624{
625 lockres_set_flags(lockres, lockres->l_flags & ~clear);
626}
627
628static inline void ocfs2_generic_handle_downconvert_action(struct ocfs2_lock_res *lockres)
629{
630 mlog_entry_void();
631
632 BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY));
633 BUG_ON(!(lockres->l_flags & OCFS2_LOCK_ATTACHED));
634 BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED));
635 BUG_ON(lockres->l_blocking <= LKM_NLMODE);
636
637 lockres->l_level = lockres->l_requested;
638 if (lockres->l_level <=
639 ocfs2_highest_compat_lock_level(lockres->l_blocking)) {
640 lockres->l_blocking = LKM_NLMODE;
641 lockres_clear_flags(lockres, OCFS2_LOCK_BLOCKED);
642 }
643 lockres_clear_flags(lockres, OCFS2_LOCK_BUSY);
644
645 mlog_exit_void();
646}
647
648static inline void ocfs2_generic_handle_convert_action(struct ocfs2_lock_res *lockres)
649{
650 mlog_entry_void();
651
652 BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY));
653 BUG_ON(!(lockres->l_flags & OCFS2_LOCK_ATTACHED));
654
655 /* Convert from RO to EX doesn't really need anything as our
656 * information is already up to data. Convert from NL to
657 * *anything* however should mark ourselves as needing an
658 * update */
f625c979
MF		 659 if (lockres->l_level == LKM_NLMODE &&
660 lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH)
ccd979bd
MF		 661 lockres_or_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH);
662
663 lockres->l_level = lockres->l_requested;
664 lockres_clear_flags(lockres, OCFS2_LOCK_BUSY);
665
666 mlog_exit_void();
667}
668
669static inline void ocfs2_generic_handle_attach_action(struct ocfs2_lock_res *lockres)
670{
671 mlog_entry_void();
672
3cf0c507 673 BUG_ON((!(lockres->l_flags & OCFS2_LOCK_BUSY)));
ccd979bd
MF		 674 BUG_ON(lockres->l_flags & OCFS2_LOCK_ATTACHED);
675
676 if (lockres->l_requested > LKM_NLMODE &&
f625c979
MF		 677 !(lockres->l_flags & OCFS2_LOCK_LOCAL) &&
678 lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH)
ccd979bd
MF		 679 lockres_or_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH);
680
681 lockres->l_level = lockres->l_requested;
682 lockres_or_flags(lockres, OCFS2_LOCK_ATTACHED);
683 lockres_clear_flags(lockres, OCFS2_LOCK_BUSY);
684
685 mlog_exit_void();
686}
687
ccd979bd
MF		 688static int ocfs2_generic_handle_bast(struct ocfs2_lock_res *lockres,
689 int level)
690{
691 int needs_downconvert = 0;
692 mlog_entry_void();
693
694 assert_spin_locked(&lockres->l_lock);
695
696 lockres_or_flags(lockres, OCFS2_LOCK_BLOCKED);
697
698 if (level > lockres->l_blocking) {
699 /* only schedule a downconvert if we haven't already scheduled
700 * one that goes low enough to satisfy the level we're
701 * blocking. this also catches the case where we get
702 * duplicate BASTs */
703 if (ocfs2_highest_compat_lock_level(level) <
704 ocfs2_highest_compat_lock_level(lockres->l_blocking))
705 needs_downconvert = 1;
706
707 lockres->l_blocking = level;
708 }
709
710 mlog_exit(needs_downconvert);
711 return needs_downconvert;
712}
713
aa2623ad 714static void ocfs2_blocking_ast(void *opaque, int level)
ccd979bd 715{
aa2623ad
MF		 716 struct ocfs2_lock_res *lockres = opaque;
717 struct ocfs2_super *osb = ocfs2_get_lockres_osb(lockres);
ccd979bd
MF		 718 int needs_downconvert;
719 unsigned long flags;
720
ccd979bd
MF		 721 BUG_ON(level <= LKM_NLMODE);
722
aa2623ad
MF		 723 mlog(0, "BAST fired for lockres %s, blocking %d, level %d type %s\n",
724 lockres->l_name, level, lockres->l_level,
725 ocfs2_lock_type_string(lockres->l_type));
726
ccd979bd
MF		 727 spin_lock_irqsave(&lockres->l_lock, flags);
728 needs_downconvert = ocfs2_generic_handle_bast(lockres, level);
729 if (needs_downconvert)
730 ocfs2_schedule_blocked_lock(osb, lockres);
731 spin_unlock_irqrestore(&lockres->l_lock, flags);
732
d680efe9
MF		 733 wake_up(&lockres->l_event);
734
ccd979bd 735 ocfs2_kick_vote_thread(osb);
ccd979bd
MF		 736}
737
e92d57df 738static void ocfs2_locking_ast(void *opaque)
ccd979bd 739{
e92d57df 740 struct ocfs2_lock_res *lockres = opaque;
ccd979bd
MF		 741 struct dlm_lockstatus *lksb = &lockres->l_lksb;
742 unsigned long flags;
743
744 spin_lock_irqsave(&lockres->l_lock, flags);
745
746 if (lksb->status != DLM_NORMAL) {
747 mlog(ML_ERROR, "lockres %s: lksb status value of %u!\n",
748 lockres->l_name, lksb->status);
749 spin_unlock_irqrestore(&lockres->l_lock, flags);
750 return;
751 }
752
753 switch(lockres->l_action) {
754 case OCFS2_AST_ATTACH:
755 ocfs2_generic_handle_attach_action(lockres);
e92d57df 756 lockres_clear_flags(lockres, OCFS2_LOCK_LOCAL);
ccd979bd
MF		 757 break;
758 case OCFS2_AST_CONVERT:
759 ocfs2_generic_handle_convert_action(lockres);
760 break;
761 case OCFS2_AST_DOWNCONVERT:
762 ocfs2_generic_handle_downconvert_action(lockres);
763 break;
764 default:
e92d57df
MF		 765 mlog(ML_ERROR, "lockres %s: ast fired with invalid action: %u "
766 "lockres flags = 0x%lx, unlock action: %u\n",
767 lockres->l_name, lockres->l_action, lockres->l_flags,
768 lockres->l_unlock_action);
ccd979bd
MF		 769 BUG();
770 }
771
ccd979bd
MF		 772 /* set it to something invalid so if we get called again we
773 * can catch it. */
774 lockres->l_action = OCFS2_AST_INVALID;
ccd979bd
MF		 775
776 wake_up(&lockres->l_event);
d680efe9 777 spin_unlock_irqrestore(&lockres->l_lock, flags);
ccd979bd
MF		 778}
779
ccd979bd
MF		 780static inline void ocfs2_recover_from_dlm_error(struct ocfs2_lock_res *lockres,
781 int convert)
782{
783 unsigned long flags;
784
785 mlog_entry_void();
786 spin_lock_irqsave(&lockres->l_lock, flags);
787 lockres_clear_flags(lockres, OCFS2_LOCK_BUSY);
788 if (convert)
789 lockres->l_action = OCFS2_AST_INVALID;
790 else
791 lockres->l_unlock_action = OCFS2_UNLOCK_INVALID;
792 spin_unlock_irqrestore(&lockres->l_lock, flags);
793
794 wake_up(&lockres->l_event);
795 mlog_exit_void();
796}
797
798/* Note: If we detect another process working on the lock (i.e.,
799 * OCFS2_LOCK_BUSY), we'll bail out returning 0. It's up to the caller
800 * to do the right thing in that case.
801 */
802static int ocfs2_lock_create(struct ocfs2_super *osb,
803 struct ocfs2_lock_res *lockres,
804 int level,
805 int dlm_flags)
806{
807 int ret = 0;
c271c5c2 808 enum dlm_status status = DLM_NORMAL;
ccd979bd
MF		 809 unsigned long flags;
810
811 mlog_entry_void();
812
813 mlog(0, "lock %s, level = %d, flags = %d\n", lockres->l_name, level,
814 dlm_flags);
815
816 spin_lock_irqsave(&lockres->l_lock, flags);
817 if ((lockres->l_flags & OCFS2_LOCK_ATTACHED) ||
818 (lockres->l_flags & OCFS2_LOCK_BUSY)) {
819 spin_unlock_irqrestore(&lockres->l_lock, flags);
820 goto bail;
821 }
822
823 lockres->l_action = OCFS2_AST_ATTACH;
824 lockres->l_requested = level;
825 lockres_or_flags(lockres, OCFS2_LOCK_BUSY);
826 spin_unlock_irqrestore(&lockres->l_lock, flags);
827
828 status = dlmlock(osb->dlm,
829 level,
830 &lockres->l_lksb,
831 dlm_flags,
832 lockres->l_name,
f0681062 833 OCFS2_LOCK_ID_MAX_LEN - 1,
e92d57df 834 ocfs2_locking_ast,
ccd979bd 835 lockres,
aa2623ad 836 ocfs2_blocking_ast);
ccd979bd
MF		 837 if (status != DLM_NORMAL) {
838 ocfs2_log_dlm_error("dlmlock", status, lockres);
839 ret = -EINVAL;
840 ocfs2_recover_from_dlm_error(lockres, 1);
841 }
842
843 mlog(0, "lock %s, successfull return from dlmlock\n", lockres->l_name);
844
845bail:
846 mlog_exit(ret);
847 return ret;
848}
849
850static inline int ocfs2_check_wait_flag(struct ocfs2_lock_res *lockres,
851 int flag)
852{
853 unsigned long flags;
854 int ret;
855
856 spin_lock_irqsave(&lockres->l_lock, flags);
857 ret = lockres->l_flags & flag;
858 spin_unlock_irqrestore(&lockres->l_lock, flags);
859
860 return ret;
861}
862
863static inline void ocfs2_wait_on_busy_lock(struct ocfs2_lock_res *lockres)
864
865{
866 wait_event(lockres->l_event,
867 !ocfs2_check_wait_flag(lockres, OCFS2_LOCK_BUSY));
868}
869
870static inline void ocfs2_wait_on_refreshing_lock(struct ocfs2_lock_res *lockres)
871
872{
873 wait_event(lockres->l_event,
874 !ocfs2_check_wait_flag(lockres, OCFS2_LOCK_REFRESHING));
875}
876
877/* predict what lock level we'll be dropping down to on behalf
878 * of another node, and return true if the currently wanted
879 * level will be compatible with it. */
880static inline int ocfs2_may_continue_on_blocked_lock(struct ocfs2_lock_res *lockres,
881 int wanted)
882{
883 BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED));
884
885 return wanted <= ocfs2_highest_compat_lock_level(lockres->l_blocking);
886}
887
888static void ocfs2_init_mask_waiter(struct ocfs2_mask_waiter *mw)
889{
890 INIT_LIST_HEAD(&mw->mw_item);
891 init_completion(&mw->mw_complete);
892}
893
894static int ocfs2_wait_for_mask(struct ocfs2_mask_waiter *mw)
895{
896 wait_for_completion(&mw->mw_complete);
897 /* Re-arm the completion in case we want to wait on it again */
898 INIT_COMPLETION(mw->mw_complete);
899 return mw->mw_status;
900}
901
902static void lockres_add_mask_waiter(struct ocfs2_lock_res *lockres,
903 struct ocfs2_mask_waiter *mw,
904 unsigned long mask,
905 unsigned long goal)
906{
907 BUG_ON(!list_empty(&mw->mw_item));
908
909 assert_spin_locked(&lockres->l_lock);
910
911 list_add_tail(&mw->mw_item, &lockres->l_mask_waiters);
912 mw->mw_mask = mask;
913 mw->mw_goal = goal;
914}
915
916/* returns 0 if the mw that was removed was already satisfied, -EBUSY
917 * if the mask still hadn't reached its goal */
918static int lockres_remove_mask_waiter(struct ocfs2_lock_res *lockres,
919 struct ocfs2_mask_waiter *mw)
920{
921 unsigned long flags;
922 int ret = 0;
923
924 spin_lock_irqsave(&lockres->l_lock, flags);
925 if (!list_empty(&mw->mw_item)) {
926 if ((lockres->l_flags & mw->mw_mask) != mw->mw_goal)
927 ret = -EBUSY;
928
929 list_del_init(&mw->mw_item);
930 init_completion(&mw->mw_complete);
931 }
932 spin_unlock_irqrestore(&lockres->l_lock, flags);
933
934 return ret;
935
936}
937
938static int ocfs2_cluster_lock(struct ocfs2_super *osb,
939 struct ocfs2_lock_res *lockres,
940 int level,
941 int lkm_flags,
942 int arg_flags)
943{
944 struct ocfs2_mask_waiter mw;
945 enum dlm_status status;
946 int wait, catch_signals = !(osb->s_mount_opt & OCFS2_MOUNT_NOINTR);
947 int ret = 0; /* gcc doesn't realize wait = 1 guarantees ret is set */
948 unsigned long flags;
949
950 mlog_entry_void();
951
952 ocfs2_init_mask_waiter(&mw);
953
b80fc012
MF		 954 if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB)
955 lkm_flags |= LKM_VALBLK;
956
ccd979bd
MF		 957again:
958 wait = 0;
959
960 if (catch_signals && signal_pending(current)) {
961 ret = -ERESTARTSYS;
962 goto out;
963 }
964
965 spin_lock_irqsave(&lockres->l_lock, flags);
966
967 mlog_bug_on_msg(lockres->l_flags & OCFS2_LOCK_FREEING,
968 "Cluster lock called on freeing lockres %s! flags "
969 "0x%lx\n", lockres->l_name, lockres->l_flags);
970
971 /* We only compare against the currently granted level
972 * here. If the lock is blocked waiting on a downconvert,
973 * we'll get caught below. */
974 if (lockres->l_flags & OCFS2_LOCK_BUSY &&
975 level > lockres->l_level) {
976 /* is someone sitting in dlm_lock? If so, wait on
977 * them. */
978 lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0);
979 wait = 1;
980 goto unlock;
981 }
982
ccd979bd
MF		 983 if (lockres->l_flags & OCFS2_LOCK_BLOCKED &&
984 !ocfs2_may_continue_on_blocked_lock(lockres, level)) {
985 /* is the lock is currently blocked on behalf of
986 * another node */
987 lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BLOCKED, 0);
988 wait = 1;
989 goto unlock;
990 }
991
992 if (level > lockres->l_level) {
993 if (lockres->l_action != OCFS2_AST_INVALID)
994 mlog(ML_ERROR, "lockres %s has action %u pending\n",
995 lockres->l_name, lockres->l_action);
996
019d1b22
MF		 997 if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) {
998 lockres->l_action = OCFS2_AST_ATTACH;
999 lkm_flags &= ~LKM_CONVERT;
1000 } else {
1001 lockres->l_action = OCFS2_AST_CONVERT;
1002 lkm_flags |= LKM_CONVERT;
1003 }
1004
ccd979bd
MF		 1005 lockres->l_requested = level;
1006 lockres_or_flags(lockres, OCFS2_LOCK_BUSY);
1007 spin_unlock_irqrestore(&lockres->l_lock, flags);
1008
1009 BUG_ON(level == LKM_IVMODE);
1010 BUG_ON(level == LKM_NLMODE);
1011
1012 mlog(0, "lock %s, convert from %d to level = %d\n",
1013 lockres->l_name, lockres->l_level, level);
1014
1015 /* call dlm_lock to upgrade lock now */
1016 status = dlmlock(osb->dlm,
1017 level,
1018 &lockres->l_lksb,
019d1b22 1019 lkm_flags,
ccd979bd 1020 lockres->l_name,
f0681062 1021 OCFS2_LOCK_ID_MAX_LEN - 1,
e92d57df 1022 ocfs2_locking_ast,
ccd979bd 1023 lockres,
aa2623ad 1024 ocfs2_blocking_ast);
ccd979bd
MF		 1025 if (status != DLM_NORMAL) {
1026 if ((lkm_flags & LKM_NOQUEUE) &&
1027 (status == DLM_NOTQUEUED))
1028 ret = -EAGAIN;
1029 else {
1030 ocfs2_log_dlm_error("dlmlock", status,
1031 lockres);
1032 ret = -EINVAL;
1033 }
1034 ocfs2_recover_from_dlm_error(lockres, 1);
1035 goto out;
1036 }
1037
1038 mlog(0, "lock %s, successfull return from dlmlock\n",
1039 lockres->l_name);
1040
1041 /* At this point we've gone inside the dlm and need to
1042 * complete our work regardless. */
1043 catch_signals = 0;
1044
1045 /* wait for busy to clear and carry on */
1046 goto again;
1047 }
1048
1049 /* Ok, if we get here then we're good to go. */
1050 ocfs2_inc_holders(lockres, level);
1051
1052 ret = 0;
1053unlock:
1054 spin_unlock_irqrestore(&lockres->l_lock, flags);
1055out:
1056 /*
1057 * This is helping work around a lock inversion between the page lock
1058 * and dlm locks. One path holds the page lock while calling aops
1059 * which block acquiring dlm locks. The voting thread holds dlm
1060 * locks while acquiring page locks while down converting data locks.
1061 * This block is helping an aop path notice the inversion and back
1062 * off to unlock its page lock before trying the dlm lock again.
1063 */
1064 if (wait && arg_flags & OCFS2_LOCK_NONBLOCK &&
1065 mw.mw_mask & (OCFS2_LOCK_BUSY|OCFS2_LOCK_BLOCKED)) {
1066 wait = 0;
1067 if (lockres_remove_mask_waiter(lockres, &mw))
1068 ret = -EAGAIN;
1069 else
1070 goto again;
1071 }
1072 if (wait) {
1073 ret = ocfs2_wait_for_mask(&mw);
1074 if (ret == 0)
1075 goto again;
1076 mlog_errno(ret);
1077 }
1078
1079 mlog_exit(ret);
1080 return ret;
1081}
1082
1083static void ocfs2_cluster_unlock(struct ocfs2_super *osb,
1084 struct ocfs2_lock_res *lockres,
1085 int level)
1086{
1087 unsigned long flags;
1088
1089 mlog_entry_void();
1090 spin_lock_irqsave(&lockres->l_lock, flags);
1091 ocfs2_dec_holders(lockres, level);
1092 ocfs2_vote_on_unlock(osb, lockres);
1093 spin_unlock_irqrestore(&lockres->l_lock, flags);
1094 mlog_exit_void();
1095}
1096
da66116e
AB		 1097static int ocfs2_create_new_lock(struct ocfs2_super *osb,
1098 struct ocfs2_lock_res *lockres,
1099 int ex,
1100 int local)
ccd979bd 1101{
d680efe9 1102 int level = ex ? LKM_EXMODE : LKM_PRMODE;
ccd979bd 1103 unsigned long flags;
24c19ef4 1104 int lkm_flags = local ? LKM_LOCAL : 0;
ccd979bd
MF		 1105
1106 spin_lock_irqsave(&lockres->l_lock, flags);
1107 BUG_ON(lockres->l_flags & OCFS2_LOCK_ATTACHED);
1108 lockres_or_flags(lockres, OCFS2_LOCK_LOCAL);
1109 spin_unlock_irqrestore(&lockres->l_lock, flags);
1110
24c19ef4 1111 return ocfs2_lock_create(osb, lockres, level, lkm_flags);
ccd979bd
MF		 1112}
1113
1114/* Grants us an EX lock on the data and metadata resources, skipping
1115 * the normal cluster directory lookup. Use this ONLY on newly created
1116 * inodes which other nodes can't possibly see, and which haven't been
1117 * hashed in the inode hash yet. This can give us a good performance
1118 * increase as it'll skip the network broadcast normally associated
1119 * with creating a new lock resource. */
1120int ocfs2_create_new_inode_locks(struct inode *inode)
1121{
1122 int ret;
d680efe9 1123 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
ccd979bd
MF		 1124
1125 BUG_ON(!inode);
1126 BUG_ON(!ocfs2_inode_is_new(inode));
1127
1128 mlog_entry_void();
1129
b0697053 1130 mlog(0, "Inode %llu\n", (unsigned long long)OCFS2_I(inode)->ip_blkno);
ccd979bd
MF		 1131
1132 /* NOTE: That we don't increment any of the holder counts, nor
1133 * do we add anything to a journal handle. Since this is
1134 * supposed to be a new inode which the cluster doesn't know
1135 * about yet, there is no need to. As far as the LVB handling
1136 * is concerned, this is basically like acquiring an EX lock
1137 * on a resource which has an invalid one -- we'll set it
1138 * valid when we release the EX. */
1139
24c19ef4 1140 ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_rw_lockres, 1, 1);
ccd979bd
MF		 1141 if (ret) {
1142 mlog_errno(ret);
1143 goto bail;
1144 }
1145
24c19ef4
MF		 1146 /*
1147 * We don't want to use LKM_LOCAL on a meta data lock as they
1148 * don't use a generation in their lock names.
1149 */
1150 ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_meta_lockres, 1, 0);
ccd979bd
MF		 1151 if (ret) {
1152 mlog_errno(ret);
1153 goto bail;
1154 }
1155
24c19ef4 1156 ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_data_lockres, 1, 1);
ccd979bd
MF		 1157 if (ret) {
1158 mlog_errno(ret);
1159 goto bail;
1160 }
1161
50008630
TY		 1162 ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_open_lockres, 0, 0);
1163 if (ret) {
1164 mlog_errno(ret);
1165 goto bail;
1166 }
1167
ccd979bd
MF		 1168bail:
1169 mlog_exit(ret);
1170 return ret;
1171}
1172
1173int ocfs2_rw_lock(struct inode *inode, int write)
1174{
1175 int status, level;
1176 struct ocfs2_lock_res *lockres;
c271c5c2 1177 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
ccd979bd
MF		 1178
1179 BUG_ON(!inode);
1180
1181 mlog_entry_void();
1182
b0697053
MF		 1183 mlog(0, "inode %llu take %s RW lock\n",
1184 (unsigned long long)OCFS2_I(inode)->ip_blkno,
ccd979bd
MF		 1185 write ? "EXMODE" : "PRMODE");
1186
c271c5c2
SM		 1187 if (ocfs2_mount_local(osb))
1188 return 0;
1189
ccd979bd
MF		 1190 lockres = &OCFS2_I(inode)->ip_rw_lockres;
1191
1192 level = write ? LKM_EXMODE : LKM_PRMODE;
1193
1194 status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres, level, 0,
1195 0);
1196 if (status < 0)
1197 mlog_errno(status);
1198
1199 mlog_exit(status);
1200 return status;
1201}
1202
1203void ocfs2_rw_unlock(struct inode *inode, int write)
1204{
1205 int level = write ? LKM_EXMODE : LKM_PRMODE;
1206 struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_rw_lockres;
c271c5c2 1207 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
ccd979bd
MF		 1208
1209 mlog_entry_void();
1210
b0697053
MF		 1211 mlog(0, "inode %llu drop %s RW lock\n",
1212 (unsigned long long)OCFS2_I(inode)->ip_blkno,
ccd979bd
MF		 1213 write ? "EXMODE" : "PRMODE");
1214
c271c5c2
SM		 1215 if (!ocfs2_mount_local(osb))
1216 ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level);
ccd979bd
MF		 1217
1218 mlog_exit_void();
1219}
1220
50008630
TY		 1221/*
1222 * ocfs2_open_lock always get PR mode lock.
1223 */
1224int ocfs2_open_lock(struct inode *inode)
1225{
1226 int status = 0;
1227 struct ocfs2_lock_res *lockres;
1228 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1229
1230 BUG_ON(!inode);
1231
1232 mlog_entry_void();
1233
1234 mlog(0, "inode %llu take PRMODE open lock\n",
1235 (unsigned long long)OCFS2_I(inode)->ip_blkno);
1236
1237 if (ocfs2_mount_local(osb))
1238 goto out;
1239
1240 lockres = &OCFS2_I(inode)->ip_open_lockres;
1241
1242 status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres,
1243 LKM_PRMODE, 0, 0);
1244 if (status < 0)
1245 mlog_errno(status);
1246
1247out:
1248 mlog_exit(status);
1249 return status;
1250}
1251
1252int ocfs2_try_open_lock(struct inode *inode, int write)
1253{
1254 int status = 0, level;
1255 struct ocfs2_lock_res *lockres;
1256 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1257
1258 BUG_ON(!inode);
1259
1260 mlog_entry_void();
1261
1262 mlog(0, "inode %llu try to take %s open lock\n",
1263 (unsigned long long)OCFS2_I(inode)->ip_blkno,
1264 write ? "EXMODE" : "PRMODE");
1265
1266 if (ocfs2_mount_local(osb))
1267 goto out;
1268
1269 lockres = &OCFS2_I(inode)->ip_open_lockres;
1270
1271 level = write ? LKM_EXMODE : LKM_PRMODE;
1272
1273 /*
1274 * The file system may already holding a PRMODE/EXMODE open lock.
1275 * Since we pass LKM_NOQUEUE, the request won't block waiting on
1276 * other nodes and the -EAGAIN will indicate to the caller that
1277 * this inode is still in use.
1278 */
1279 status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres,
1280 level, LKM_NOQUEUE, 0);
1281
1282out:
1283 mlog_exit(status);
1284 return status;
1285}
1286
1287/*
1288 * ocfs2_open_unlock unlock PR and EX mode open locks.
1289 */
1290void ocfs2_open_unlock(struct inode *inode)
1291{
1292 struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_open_lockres;
1293 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1294
1295 mlog_entry_void();
1296
1297 mlog(0, "inode %llu drop open lock\n",
1298 (unsigned long long)OCFS2_I(inode)->ip_blkno);
1299
1300 if (ocfs2_mount_local(osb))
1301 goto out;
1302
1303 if(lockres->l_ro_holders)
1304 ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres,
1305 LKM_PRMODE);
1306 if(lockres->l_ex_holders)
1307 ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres,
1308 LKM_EXMODE);
1309
1310out:
1311 mlog_exit_void();
1312}
1313
ccd979bd
MF		 1314int ocfs2_data_lock_full(struct inode *inode,
1315 int write,
1316 int arg_flags)
1317{
1318 int status = 0, level;
1319 struct ocfs2_lock_res *lockres;
c271c5c2 1320 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
ccd979bd
MF		 1321
1322 BUG_ON(!inode);
1323
1324 mlog_entry_void();
1325
b0697053
MF		 1326 mlog(0, "inode %llu take %s DATA lock\n",
1327 (unsigned long long)OCFS2_I(inode)->ip_blkno,
ccd979bd
MF		 1328 write ? "EXMODE" : "PRMODE");
1329
1330 /* We'll allow faking a readonly data lock for
1331 * rodevices. */
1332 if (ocfs2_is_hard_readonly(OCFS2_SB(inode->i_sb))) {
1333 if (write) {
1334 status = -EROFS;
1335 mlog_errno(status);
1336 }
1337 goto out;
1338 }
1339
c271c5c2
SM		 1340 if (ocfs2_mount_local(osb))
1341 goto out;
1342
ccd979bd
MF		 1343 lockres = &OCFS2_I(inode)->ip_data_lockres;
1344
1345 level = write ? LKM_EXMODE : LKM_PRMODE;
1346
1347 status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres, level,
1348 0, arg_flags);
1349 if (status < 0 && status != -EAGAIN)
1350 mlog_errno(status);
1351
1352out:
1353 mlog_exit(status);
1354 return status;
1355}
1356
1357/* see ocfs2_meta_lock_with_page() */
1358int ocfs2_data_lock_with_page(struct inode *inode,
1359 int write,
1360 struct page *page)
1361{
1362 int ret;
1363
1364 ret = ocfs2_data_lock_full(inode, write, OCFS2_LOCK_NONBLOCK);
1365 if (ret == -EAGAIN) {
1366 unlock_page(page);
1367 if (ocfs2_data_lock(inode, write) == 0)
1368 ocfs2_data_unlock(inode, write);
1369 ret = AOP_TRUNCATED_PAGE;
1370 }
1371
1372 return ret;
1373}
1374
1375static void ocfs2_vote_on_unlock(struct ocfs2_super *osb,
1376 struct ocfs2_lock_res *lockres)
1377{
1378 int kick = 0;
1379
1380 mlog_entry_void();
1381
1382 /* If we know that another node is waiting on our lock, kick
1383 * the vote thread * pre-emptively when we reach a release
1384 * condition. */
1385 if (lockres->l_flags & OCFS2_LOCK_BLOCKED) {
1386 switch(lockres->l_blocking) {
1387 case LKM_EXMODE:
1388 if (!lockres->l_ex_holders && !lockres->l_ro_holders)
1389 kick = 1;
1390 break;
1391 case LKM_PRMODE:
1392 if (!lockres->l_ex_holders)
1393 kick = 1;
1394 break;
1395 default:
1396 BUG();
1397 }
1398 }
1399
1400 if (kick)
1401 ocfs2_kick_vote_thread(osb);
1402
1403 mlog_exit_void();
1404}
1405
1406void ocfs2_data_unlock(struct inode *inode,
1407 int write)
1408{
1409 int level = write ? LKM_EXMODE : LKM_PRMODE;
1410 struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_data_lockres;
c271c5c2 1411 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
ccd979bd
MF		 1412
1413 mlog_entry_void();
1414
b0697053
MF		 1415 mlog(0, "inode %llu drop %s DATA lock\n",
1416 (unsigned long long)OCFS2_I(inode)->ip_blkno,
ccd979bd
MF		 1417 write ? "EXMODE" : "PRMODE");
1418
c271c5c2
SM		 1419 if (!ocfs2_is_hard_readonly(OCFS2_SB(inode->i_sb)) &&
1420 !ocfs2_mount_local(osb))
ccd979bd
MF		 1421 ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level);
1422
1423 mlog_exit_void();
1424}
1425
1426#define OCFS2_SEC_BITS 34
1427#define OCFS2_SEC_SHIFT (64 - 34)
1428#define OCFS2_NSEC_MASK ((1ULL << OCFS2_SEC_SHIFT) - 1)
1429
1430/* LVB only has room for 64 bits of time here so we pack it for
1431 * now. */
1432static u64 ocfs2_pack_timespec(struct timespec *spec)
1433{
1434 u64 res;
1435 u64 sec = spec->tv_sec;
1436 u32 nsec = spec->tv_nsec;
1437
1438 res = (sec << OCFS2_SEC_SHIFT) | (nsec & OCFS2_NSEC_MASK);
1439
1440 return res;
1441}
1442
1443/* Call this with the lockres locked. I am reasonably sure we don't
1444 * need ip_lock in this function as anyone who would be changing those
1445 * values is supposed to be blocked in ocfs2_meta_lock right now. */
1446static void __ocfs2_stuff_meta_lvb(struct inode *inode)
1447{
1448 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1449 struct ocfs2_lock_res *lockres = &oi->ip_meta_lockres;
1450 struct ocfs2_meta_lvb *lvb;
1451
1452 mlog_entry_void();
1453
1454 lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb;
1455
24c19ef4
MF		 1456 /*
1457 * Invalidate the LVB of a deleted inode - this way other
1458 * nodes are forced to go to disk and discover the new inode
1459 * status.
1460 */
1461 if (oi->ip_flags & OCFS2_INODE_DELETED) {
1462 lvb->lvb_version = 0;
1463 goto out;
1464 }
1465
4d3b83f7 1466 lvb->lvb_version = OCFS2_LVB_VERSION;
ccd979bd
MF		 1467 lvb->lvb_isize = cpu_to_be64(i_size_read(inode));
1468 lvb->lvb_iclusters = cpu_to_be32(oi->ip_clusters);
1469 lvb->lvb_iuid = cpu_to_be32(inode->i_uid);
1470 lvb->lvb_igid = cpu_to_be32(inode->i_gid);
1471 lvb->lvb_imode = cpu_to_be16(inode->i_mode);
1472 lvb->lvb_inlink = cpu_to_be16(inode->i_nlink);
1473 lvb->lvb_iatime_packed =
1474 cpu_to_be64(ocfs2_pack_timespec(&inode->i_atime));
1475 lvb->lvb_ictime_packed =
1476 cpu_to_be64(ocfs2_pack_timespec(&inode->i_ctime));
1477 lvb->lvb_imtime_packed =
1478 cpu_to_be64(ocfs2_pack_timespec(&inode->i_mtime));
ca4d147e 1479 lvb->lvb_iattr = cpu_to_be32(oi->ip_attr);
15b1e36b 1480 lvb->lvb_idynfeatures = cpu_to_be16(oi->ip_dyn_features);
f9e2d82e 1481 lvb->lvb_igeneration = cpu_to_be32(inode->i_generation);
ccd979bd 1482
24c19ef4 1483out:
ccd979bd
MF		 1484 mlog_meta_lvb(0, lockres);
1485
1486 mlog_exit_void();
1487}
1488
1489static void ocfs2_unpack_timespec(struct timespec *spec,
1490 u64 packed_time)
1491{
1492 spec->tv_sec = packed_time >> OCFS2_SEC_SHIFT;
1493 spec->tv_nsec = packed_time & OCFS2_NSEC_MASK;
1494}
1495
1496static void ocfs2_refresh_inode_from_lvb(struct inode *inode)
1497{
1498 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1499 struct ocfs2_lock_res *lockres = &oi->ip_meta_lockres;
1500 struct ocfs2_meta_lvb *lvb;
1501
1502 mlog_entry_void();
1503
1504 mlog_meta_lvb(0, lockres);
1505
1506 lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb;
1507
1508 /* We're safe here without the lockres lock... */
1509 spin_lock(&oi->ip_lock);
1510 oi->ip_clusters = be32_to_cpu(lvb->lvb_iclusters);
1511 i_size_write(inode, be64_to_cpu(lvb->lvb_isize));
1512
ca4d147e 1513 oi->ip_attr = be32_to_cpu(lvb->lvb_iattr);
15b1e36b 1514 oi->ip_dyn_features = be16_to_cpu(lvb->lvb_idynfeatures);
ca4d147e
HP		 1515 ocfs2_set_inode_flags(inode);
1516
ccd979bd
MF		 1517 /* fast-symlinks are a special case */
1518 if (S_ISLNK(inode->i_mode) && !oi->ip_clusters)
1519 inode->i_blocks = 0;
1520 else
8110b073 1521 inode->i_blocks = ocfs2_inode_sector_count(inode);
ccd979bd
MF		 1522
1523 inode->i_uid = be32_to_cpu(lvb->lvb_iuid);
1524 inode->i_gid = be32_to_cpu(lvb->lvb_igid);
1525 inode->i_mode = be16_to_cpu(lvb->lvb_imode);
1526 inode->i_nlink = be16_to_cpu(lvb->lvb_inlink);
1527 ocfs2_unpack_timespec(&inode->i_atime,
1528 be64_to_cpu(lvb->lvb_iatime_packed));
1529 ocfs2_unpack_timespec(&inode->i_mtime,
1530 be64_to_cpu(lvb->lvb_imtime_packed));
1531 ocfs2_unpack_timespec(&inode->i_ctime,
1532 be64_to_cpu(lvb->lvb_ictime_packed));
1533 spin_unlock(&oi->ip_lock);
1534
1535 mlog_exit_void();
1536}
1537
f9e2d82e
MF		 1538static inline int ocfs2_meta_lvb_is_trustable(struct inode *inode,
1539 struct ocfs2_lock_res *lockres)
ccd979bd
MF		 1540{
1541 struct ocfs2_meta_lvb *lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb;
1542
f9e2d82e
MF		 1543 if (lvb->lvb_version == OCFS2_LVB_VERSION
1544 && be32_to_cpu(lvb->lvb_igeneration) == inode->i_generation)
ccd979bd
MF		 1545 return 1;
1546 return 0;
1547}
1548
1549/* Determine whether a lock resource needs to be refreshed, and
1550 * arbitrate who gets to refresh it.
1551 *
1552 * 0 means no refresh needed.
1553 *
1554 * > 0 means you need to refresh this and you MUST call
1555 * ocfs2_complete_lock_res_refresh afterwards. */
1556static int ocfs2_should_refresh_lock_res(struct ocfs2_lock_res *lockres)
1557{
1558 unsigned long flags;
1559 int status = 0;
1560
1561 mlog_entry_void();
1562
1563refresh_check:
1564 spin_lock_irqsave(&lockres->l_lock, flags);
1565 if (!(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) {
1566 spin_unlock_irqrestore(&lockres->l_lock, flags);
1567 goto bail;
1568 }
1569
1570 if (lockres->l_flags & OCFS2_LOCK_REFRESHING) {
1571 spin_unlock_irqrestore(&lockres->l_lock, flags);
1572
1573 ocfs2_wait_on_refreshing_lock(lockres);
1574 goto refresh_check;
1575 }
1576
1577 /* Ok, I'll be the one to refresh this lock. */
1578 lockres_or_flags(lockres, OCFS2_LOCK_REFRESHING);
1579 spin_unlock_irqrestore(&lockres->l_lock, flags);
1580
1581 status = 1;
1582bail:
1583 mlog_exit(status);
1584 return status;
1585}
1586
1587/* If status is non zero, I'll mark it as not being in refresh
1588 * anymroe, but i won't clear the needs refresh flag. */
1589static inline void ocfs2_complete_lock_res_refresh(struct ocfs2_lock_res *lockres,
1590 int status)
1591{
1592 unsigned long flags;
1593 mlog_entry_void();
1594
1595 spin_lock_irqsave(&lockres->l_lock, flags);
1596 lockres_clear_flags(lockres, OCFS2_LOCK_REFRESHING);
1597 if (!status)
1598 lockres_clear_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH);
1599 spin_unlock_irqrestore(&lockres->l_lock, flags);
1600
1601 wake_up(&lockres->l_event);
1602
1603 mlog_exit_void();
1604}
1605
1606/* may or may not return a bh if it went to disk. */
1607static int ocfs2_meta_lock_update(struct inode *inode,
1608 struct buffer_head **bh)
1609{
1610 int status = 0;
1611 struct ocfs2_inode_info *oi = OCFS2_I(inode);
be9e986b 1612 struct ocfs2_lock_res *lockres = &oi->ip_meta_lockres;
ccd979bd 1613 struct ocfs2_dinode *fe;
c271c5c2 1614 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
ccd979bd
MF		 1615
1616 mlog_entry_void();
1617
be9e986b
MF		 1618 if (ocfs2_mount_local(osb))
1619 goto bail;
1620
ccd979bd
MF		 1621 spin_lock(&oi->ip_lock);
1622 if (oi->ip_flags & OCFS2_INODE_DELETED) {
b0697053 1623 mlog(0, "Orphaned inode %llu was deleted while we "
ccd979bd 1624 "were waiting on a lock. ip_flags = 0x%x\n",
b0697053 1625 (unsigned long long)oi->ip_blkno, oi->ip_flags);
ccd979bd
MF		 1626 spin_unlock(&oi->ip_lock);
1627 status = -ENOENT;
1628 goto bail;
1629 }
1630 spin_unlock(&oi->ip_lock);
1631
be9e986b
MF		 1632 if (!ocfs2_should_refresh_lock_res(lockres))
1633 goto bail;
ccd979bd
MF		 1634
1635 /* This will discard any caching information we might have had
1636 * for the inode metadata. */
1637 ocfs2_metadata_cache_purge(inode);
1638
83418978
MF		 1639 ocfs2_extent_map_trunc(inode, 0);
1640
be9e986b 1641 if (ocfs2_meta_lvb_is_trustable(inode, lockres)) {
b0697053
MF		 1642 mlog(0, "Trusting LVB on inode %llu\n",
1643 (unsigned long long)oi->ip_blkno);
ccd979bd
MF		 1644 ocfs2_refresh_inode_from_lvb(inode);
1645 } else {
1646 /* Boo, we have to go to disk. */
1647 /* read bh, cast, ocfs2_refresh_inode */
1648 status = ocfs2_read_block(OCFS2_SB(inode->i_sb), oi->ip_blkno,
1649 bh, OCFS2_BH_CACHED, inode);
1650 if (status < 0) {
1651 mlog_errno(status);
1652 goto bail_refresh;
1653 }
1654 fe = (struct ocfs2_dinode *) (*bh)->b_data;
1655
1656 /* This is a good chance to make sure we're not
1657 * locking an invalid object.
1658 *
1659 * We bug on a stale inode here because we checked
1660 * above whether it was wiped from disk. The wiping
1661 * node provides a guarantee that we receive that
1662 * message and can mark the inode before dropping any
1663 * locks associated with it. */
1664 if (!OCFS2_IS_VALID_DINODE(fe)) {
1665 OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe);
1666 status = -EIO;
1667 goto bail_refresh;
1668 }
1669 mlog_bug_on_msg(inode->i_generation !=
1670 le32_to_cpu(fe->i_generation),
b0697053 1671 "Invalid dinode %llu disk generation: %u "
ccd979bd 1672 "inode->i_generation: %u\n",
b0697053
MF		 1673 (unsigned long long)oi->ip_blkno,
1674 le32_to_cpu(fe->i_generation),
ccd979bd
MF		 1675 inode->i_generation);
1676 mlog_bug_on_msg(le64_to_cpu(fe->i_dtime) ||
1677 !(fe->i_flags & cpu_to_le32(OCFS2_VALID_FL)),
b0697053
MF		 1678 "Stale dinode %llu dtime: %llu flags: 0x%x\n",
1679 (unsigned long long)oi->ip_blkno,
1680 (unsigned long long)le64_to_cpu(fe->i_dtime),
ccd979bd
MF		 1681 le32_to_cpu(fe->i_flags));
1682
1683 ocfs2_refresh_inode(inode, fe);
1684 }
1685
1686 status = 0;
1687bail_refresh:
be9e986b 1688 ocfs2_complete_lock_res_refresh(lockres, status);
ccd979bd
MF		 1689bail:
1690 mlog_exit(status);
1691 return status;
1692}
1693
1694static int ocfs2_assign_bh(struct inode *inode,
1695 struct buffer_head **ret_bh,
1696 struct buffer_head *passed_bh)
1697{
1698 int status;
1699
1700 if (passed_bh) {
1701 /* Ok, the update went to disk for us, use the
1702 * returned bh. */
1703 *ret_bh = passed_bh;
1704 get_bh(*ret_bh);
1705
1706 return 0;
1707 }
1708
1709 status = ocfs2_read_block(OCFS2_SB(inode->i_sb),
1710 OCFS2_I(inode)->ip_blkno,
1711 ret_bh,
1712 OCFS2_BH_CACHED,
1713 inode);
1714 if (status < 0)
1715 mlog_errno(status);
1716
1717 return status;
1718}
1719
1720/*
1721 * returns < 0 error if the callback will never be called, otherwise
1722 * the result of the lock will be communicated via the callback.
1723 */
1724int ocfs2_meta_lock_full(struct inode *inode,
ccd979bd
MF		 1725 struct buffer_head **ret_bh,
1726 int ex,
1727 int arg_flags)
1728{
1729 int status, level, dlm_flags, acquired;
c271c5c2 1730 struct ocfs2_lock_res *lockres = NULL;
ccd979bd
MF		 1731 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1732 struct buffer_head *local_bh = NULL;
1733
1734 BUG_ON(!inode);
1735
1736 mlog_entry_void();
1737
b0697053
MF		 1738 mlog(0, "inode %llu, take %s META lock\n",
1739 (unsigned long long)OCFS2_I(inode)->ip_blkno,
ccd979bd
MF		 1740 ex ? "EXMODE" : "PRMODE");
1741
1742 status = 0;
1743 acquired = 0;
1744 /* We'll allow faking a readonly metadata lock for
1745 * rodevices. */
1746 if (ocfs2_is_hard_readonly(osb)) {
1747 if (ex)
1748 status = -EROFS;
1749 goto bail;
1750 }
1751
c271c5c2
SM		 1752 if (ocfs2_mount_local(osb))
1753 goto local;
1754
ccd979bd
MF		 1755 if (!(arg_flags & OCFS2_META_LOCK_RECOVERY))
1756 wait_event(osb->recovery_event,
1757 ocfs2_node_map_is_empty(osb, &osb->recovery_map));
1758
ccd979bd
MF		 1759 lockres = &OCFS2_I(inode)->ip_meta_lockres;
1760 level = ex ? LKM_EXMODE : LKM_PRMODE;
1761 dlm_flags = 0;
1762 if (arg_flags & OCFS2_META_LOCK_NOQUEUE)
1763 dlm_flags |= LKM_NOQUEUE;
1764
1765 status = ocfs2_cluster_lock(osb, lockres, level, dlm_flags, arg_flags);
1766 if (status < 0) {
1767 if (status != -EAGAIN && status != -EIOCBRETRY)
1768 mlog_errno(status);
1769 goto bail;
1770 }
1771
1772 /* Notify the error cleanup path to drop the cluster lock. */
1773 acquired = 1;
1774
1775 /* We wait twice because a node may have died while we were in
1776 * the lower dlm layers. The second time though, we've
1777 * committed to owning this lock so we don't allow signals to
1778 * abort the operation. */
1779 if (!(arg_flags & OCFS2_META_LOCK_RECOVERY))
1780 wait_event(osb->recovery_event,
1781 ocfs2_node_map_is_empty(osb, &osb->recovery_map));
1782
c271c5c2 1783local:
24c19ef4
MF		 1784 /*
1785 * We only see this flag if we're being called from
1786 * ocfs2_read_locked_inode(). It means we're locking an inode
1787 * which hasn't been populated yet, so clear the refresh flag
1788 * and let the caller handle it.
1789 */
1790 if (inode->i_state & I_NEW) {
1791 status = 0;
c271c5c2
SM		 1792 if (lockres)
1793 ocfs2_complete_lock_res_refresh(lockres, 0);
24c19ef4
MF		 1794 goto bail;
1795 }
1796
ccd979bd
MF		 1797 /* This is fun. The caller may want a bh back, or it may
1798 * not. ocfs2_meta_lock_update definitely wants one in, but
1799 * may or may not read one, depending on what's in the
1800 * LVB. The result of all of this is that we've *only* gone to
1801 * disk if we have to, so the complexity is worthwhile. */
1802 status = ocfs2_meta_lock_update(inode, &local_bh);
1803 if (status < 0) {
1804 if (status != -ENOENT)
1805 mlog_errno(status);
1806 goto bail;
1807 }
1808
1809 if (ret_bh) {
1810 status = ocfs2_assign_bh(inode, ret_bh, local_bh);
1811 if (status < 0) {
1812 mlog_errno(status);
1813 goto bail;
1814 }
1815 }
1816
ccd979bd
MF		 1817bail:
1818 if (status < 0) {
1819 if (ret_bh && (*ret_bh)) {
1820 brelse(*ret_bh);
1821 *ret_bh = NULL;
1822 }
1823 if (acquired)
1824 ocfs2_meta_unlock(inode, ex);
1825 }
1826
1827 if (local_bh)
1828 brelse(local_bh);
1829
1830 mlog_exit(status);
1831 return status;
1832}
1833
1834/*
1835 * This is working around a lock inversion between tasks acquiring DLM locks
1836 * while holding a page lock and the vote thread which blocks dlm lock acquiry
1837 * while acquiring page locks.
1838 *
1839 * ** These _with_page variantes are only intended to be called from aop
1840 * methods that hold page locks and return a very specific *positive* error
1841 * code that aop methods pass up to the VFS -- test for errors with != 0. **
1842 *
1843 * The DLM is called such that it returns -EAGAIN if it would have blocked
1844 * waiting for the vote thread. In that case we unlock our page so the vote
1845 * thread can make progress. Once we've done this we have to return
1846 * AOP_TRUNCATED_PAGE so the aop method that called us can bubble that back up
1847 * into the VFS who will then immediately retry the aop call.
1848 *
1849 * We do a blocking lock and immediate unlock before returning, though, so that
1850 * the lock has a great chance of being cached on this node by the time the VFS
1851 * calls back to retry the aop. This has a potential to livelock as nodes
1852 * ping locks back and forth, but that's a risk we're willing to take to avoid
1853 * the lock inversion simply.
1854 */
1855int ocfs2_meta_lock_with_page(struct inode *inode,
ccd979bd
MF		 1856 struct buffer_head **ret_bh,
1857 int ex,
1858 struct page *page)
1859{
1860 int ret;
1861
4bcec184 1862 ret = ocfs2_meta_lock_full(inode, ret_bh, ex, OCFS2_LOCK_NONBLOCK);
ccd979bd
MF		 1863 if (ret == -EAGAIN) {
1864 unlock_page(page);
4bcec184 1865 if (ocfs2_meta_lock(inode, ret_bh, ex) == 0)
ccd979bd
MF		 1866 ocfs2_meta_unlock(inode, ex);
1867 ret = AOP_TRUNCATED_PAGE;
1868 }
1869
1870 return ret;
1871}
1872
7f1a37e3
TY		 1873int ocfs2_meta_lock_atime(struct inode *inode,
1874 struct vfsmount *vfsmnt,
1875 int *level)
1876{
1877 int ret;
1878
1879 mlog_entry_void();
1880 ret = ocfs2_meta_lock(inode, NULL, 0);
1881 if (ret < 0) {
1882 mlog_errno(ret);
1883 return ret;
1884 }
1885
1886 /*
1887 * If we should update atime, we will get EX lock,
1888 * otherwise we just get PR lock.
1889 */
1890 if (ocfs2_should_update_atime(inode, vfsmnt)) {
1891 struct buffer_head *bh = NULL;
1892
1893 ocfs2_meta_unlock(inode, 0);
1894 ret = ocfs2_meta_lock(inode, &bh, 1);
1895 if (ret < 0) {
1896 mlog_errno(ret);
1897 return ret;
1898 }
1899 *level = 1;
1900 if (ocfs2_should_update_atime(inode, vfsmnt))
1901 ocfs2_update_inode_atime(inode, bh);
1902 if (bh)
1903 brelse(bh);
1904 } else
1905 *level = 0;
1906
1907 mlog_exit(ret);
1908 return ret;
1909}
1910
ccd979bd
MF		 1911void ocfs2_meta_unlock(struct inode *inode,
1912 int ex)
1913{
1914 int level = ex ? LKM_EXMODE : LKM_PRMODE;
1915 struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_meta_lockres;
c271c5c2 1916 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
ccd979bd
MF		 1917
1918 mlog_entry_void();
1919
b0697053
MF		 1920 mlog(0, "inode %llu drop %s META lock\n",
1921 (unsigned long long)OCFS2_I(inode)->ip_blkno,
ccd979bd
MF		 1922 ex ? "EXMODE" : "PRMODE");
1923
c271c5c2
SM		 1924 if (!ocfs2_is_hard_readonly(OCFS2_SB(inode->i_sb)) &&
1925 !ocfs2_mount_local(osb))
ccd979bd
MF		 1926 ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level);
1927
1928 mlog_exit_void();
1929}
1930
1931int ocfs2_super_lock(struct ocfs2_super *osb,
1932 int ex)
1933{
c271c5c2 1934 int status = 0;
ccd979bd
MF		 1935 int level = ex ? LKM_EXMODE : LKM_PRMODE;
1936 struct ocfs2_lock_res *lockres = &osb->osb_super_lockres;
1937 struct buffer_head *bh;
1938 struct ocfs2_slot_info *si = osb->slot_info;
1939
1940 mlog_entry_void();
1941
1942 if (ocfs2_is_hard_readonly(osb))
1943 return -EROFS;
1944
c271c5c2
SM		 1945 if (ocfs2_mount_local(osb))
1946 goto bail;
1947
ccd979bd
MF		 1948 status = ocfs2_cluster_lock(osb, lockres, level, 0, 0);
1949 if (status < 0) {
1950 mlog_errno(status);
1951 goto bail;
1952 }
1953
1954 /* The super block lock path is really in the best position to
1955 * know when resources covered by the lock need to be
1956 * refreshed, so we do it here. Of course, making sense of
1957 * everything is up to the caller :) */
1958 status = ocfs2_should_refresh_lock_res(lockres);
1959 if (status < 0) {
1960 mlog_errno(status);
1961 goto bail;
1962 }
1963 if (status) {
1964 bh = si->si_bh;
1965 status = ocfs2_read_block(osb, bh->b_blocknr, &bh, 0,
1966 si->si_inode);
1967 if (status == 0)
1968 ocfs2_update_slot_info(si);
1969
1970 ocfs2_complete_lock_res_refresh(lockres, status);
1971
1972 if (status < 0)
1973 mlog_errno(status);
1974 }
1975bail:
1976 mlog_exit(status);
1977 return status;
1978}
1979
1980void ocfs2_super_unlock(struct ocfs2_super *osb,
1981 int ex)
1982{
1983 int level = ex ? LKM_EXMODE : LKM_PRMODE;
1984 struct ocfs2_lock_res *lockres = &osb->osb_super_lockres;
1985
c271c5c2
SM		 1986 if (!ocfs2_mount_local(osb))
1987 ocfs2_cluster_unlock(osb, lockres, level);
ccd979bd
MF		 1988}
1989
1990int ocfs2_rename_lock(struct ocfs2_super *osb)
1991{
1992 int status;
1993 struct ocfs2_lock_res *lockres = &osb->osb_rename_lockres;
1994
1995 if (ocfs2_is_hard_readonly(osb))
1996 return -EROFS;
1997
c271c5c2
SM		 1998 if (ocfs2_mount_local(osb))
1999 return 0;
2000
ccd979bd
MF		 2001 status = ocfs2_cluster_lock(osb, lockres, LKM_EXMODE, 0, 0);
2002 if (status < 0)
2003 mlog_errno(status);
2004
2005 return status;
2006}
2007
2008void ocfs2_rename_unlock(struct ocfs2_super *osb)
2009{
2010 struct ocfs2_lock_res *lockres = &osb->osb_rename_lockres;
2011
c271c5c2
SM		 2012 if (!ocfs2_mount_local(osb))
2013 ocfs2_cluster_unlock(osb, lockres, LKM_EXMODE);
ccd979bd
MF		 2014}
2015
d680efe9
MF		 2016int ocfs2_dentry_lock(struct dentry *dentry, int ex)
2017{
2018 int ret;
2019 int level = ex ? LKM_EXMODE : LKM_PRMODE;
2020 struct ocfs2_dentry_lock *dl = dentry->d_fsdata;
2021 struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
2022
2023 BUG_ON(!dl);
2024
2025 if (ocfs2_is_hard_readonly(osb))
2026 return -EROFS;
2027
c271c5c2
SM		 2028 if (ocfs2_mount_local(osb))
2029 return 0;
2030
d680efe9
MF		 2031 ret = ocfs2_cluster_lock(osb, &dl->dl_lockres, level, 0, 0);
2032 if (ret < 0)
2033 mlog_errno(ret);
2034
2035 return ret;
2036}
2037
2038void ocfs2_dentry_unlock(struct dentry *dentry, int ex)
2039{
2040 int level = ex ? LKM_EXMODE : LKM_PRMODE;
2041 struct ocfs2_dentry_lock *dl = dentry->d_fsdata;
2042 struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
2043
c271c5c2
SM		 2044 if (!ocfs2_mount_local(osb))
2045 ocfs2_cluster_unlock(osb, &dl->dl_lockres, level);
d680efe9
MF		 2046}
2047
ccd979bd
MF		 2048/* Reference counting of the dlm debug structure. We want this because
2049 * open references on the debug inodes can live on after a mount, so
2050 * we can't rely on the ocfs2_super to always exist. */
2051static void ocfs2_dlm_debug_free(struct kref *kref)
2052{
2053 struct ocfs2_dlm_debug *dlm_debug;
2054
2055 dlm_debug = container_of(kref, struct ocfs2_dlm_debug, d_refcnt);
2056
2057 kfree(dlm_debug);
2058}
2059
2060void ocfs2_put_dlm_debug(struct ocfs2_dlm_debug *dlm_debug)
2061{
2062 if (dlm_debug)
2063 kref_put(&dlm_debug->d_refcnt, ocfs2_dlm_debug_free);
2064}
2065
2066static void ocfs2_get_dlm_debug(struct ocfs2_dlm_debug *debug)
2067{
2068 kref_get(&debug->d_refcnt);
2069}
2070
2071struct ocfs2_dlm_debug *ocfs2_new_dlm_debug(void)
2072{
2073 struct ocfs2_dlm_debug *dlm_debug;
2074
2075 dlm_debug = kmalloc(sizeof(struct ocfs2_dlm_debug), GFP_KERNEL);
2076 if (!dlm_debug) {
2077 mlog_errno(-ENOMEM);
2078 goto out;
2079 }
2080
2081 kref_init(&dlm_debug->d_refcnt);
2082 INIT_LIST_HEAD(&dlm_debug->d_lockres_tracking);
2083 dlm_debug->d_locking_state = NULL;
2084out:
2085 return dlm_debug;
2086}
2087
2088/* Access to this is arbitrated for us via seq_file->sem. */
2089struct ocfs2_dlm_seq_priv {
2090 struct ocfs2_dlm_debug *p_dlm_debug;
2091 struct ocfs2_lock_res p_iter_res;
2092 struct ocfs2_lock_res p_tmp_res;
2093};
2094
2095static struct ocfs2_lock_res *ocfs2_dlm_next_res(struct ocfs2_lock_res *start,
2096 struct ocfs2_dlm_seq_priv *priv)
2097{
2098 struct ocfs2_lock_res *iter, *ret = NULL;
2099 struct ocfs2_dlm_debug *dlm_debug = priv->p_dlm_debug;
2100
2101 assert_spin_locked(&ocfs2_dlm_tracking_lock);
2102
2103 list_for_each_entry(iter, &start->l_debug_list, l_debug_list) {
2104 /* discover the head of the list */
2105 if (&iter->l_debug_list == &dlm_debug->d_lockres_tracking) {
2106 mlog(0, "End of list found, %p\n", ret);
2107 break;
2108 }
2109
2110 /* We track our "dummy" iteration lockres' by a NULL
2111 * l_ops field. */
2112 if (iter->l_ops != NULL) {
2113 ret = iter;
2114 break;
2115 }
2116 }
2117
2118 return ret;
2119}
2120
2121static void *ocfs2_dlm_seq_start(struct seq_file *m, loff_t *pos)
2122{
2123 struct ocfs2_dlm_seq_priv *priv = m->private;
2124 struct ocfs2_lock_res *iter;
2125
2126 spin_lock(&ocfs2_dlm_tracking_lock);
2127 iter = ocfs2_dlm_next_res(&priv->p_iter_res, priv);
2128 if (iter) {
2129 /* Since lockres' have the lifetime of their container
2130 * (which can be inodes, ocfs2_supers, etc) we want to
2131 * copy this out to a temporary lockres while still
2132 * under the spinlock. Obviously after this we can't
2133 * trust any pointers on the copy returned, but that's
2134 * ok as the information we want isn't typically held
2135 * in them. */
2136 priv->p_tmp_res = *iter;
2137 iter = &priv->p_tmp_res;
2138 }
2139 spin_unlock(&ocfs2_dlm_tracking_lock);
2140
2141 return iter;
2142}
2143
2144static void ocfs2_dlm_seq_stop(struct seq_file *m, void *v)
2145{
2146}
2147
2148static void *ocfs2_dlm_seq_next(struct seq_file *m, void *v, loff_t *pos)
2149{
2150 struct ocfs2_dlm_seq_priv *priv = m->private;
2151 struct ocfs2_lock_res *iter = v;
2152 struct ocfs2_lock_res *dummy = &priv->p_iter_res;
2153
2154 spin_lock(&ocfs2_dlm_tracking_lock);
2155 iter = ocfs2_dlm_next_res(iter, priv);
2156 list_del_init(&dummy->l_debug_list);
2157 if (iter) {
2158 list_add(&dummy->l_debug_list, &iter->l_debug_list);
2159 priv->p_tmp_res = *iter;
2160 iter = &priv->p_tmp_res;
2161 }
2162 spin_unlock(&ocfs2_dlm_tracking_lock);
2163
2164 return iter;
2165}
2166
2167/* So that debugfs.ocfs2 can determine which format is being used */
2168#define OCFS2_DLM_DEBUG_STR_VERSION 1
2169static int ocfs2_dlm_seq_show(struct seq_file *m, void *v)
2170{
2171 int i;
2172 char *lvb;
2173 struct ocfs2_lock_res *lockres = v;
2174
2175 if (!lockres)
2176 return -EINVAL;
2177
d680efe9
MF		 2178 seq_printf(m, "0x%x\t", OCFS2_DLM_DEBUG_STR_VERSION);
2179
2180 if (lockres->l_type == OCFS2_LOCK_TYPE_DENTRY)
2181 seq_printf(m, "%.*s%08x\t", OCFS2_DENTRY_LOCK_INO_START - 1,
2182 lockres->l_name,
2183 (unsigned int)ocfs2_get_dentry_lock_ino(lockres));
2184 else
2185 seq_printf(m, "%.*s\t", OCFS2_LOCK_ID_MAX_LEN, lockres->l_name);
2186
2187 seq_printf(m, "%d\t"
ccd979bd
MF		 2188 "0x%lx\t"
2189 "0x%x\t"
2190 "0x%x\t"
2191 "%u\t"
2192 "%u\t"
2193 "%d\t"
2194 "%d\t",
ccd979bd
MF		 2195 lockres->l_level,
2196 lockres->l_flags,
2197 lockres->l_action,
2198 lockres->l_unlock_action,
2199 lockres->l_ro_holders,
2200 lockres->l_ex_holders,
2201 lockres->l_requested,
2202 lockres->l_blocking);
2203
2204 /* Dump the raw LVB */
2205 lvb = lockres->l_lksb.lvb;
2206 for(i = 0; i < DLM_LVB_LEN; i++)
2207 seq_printf(m, "0x%x\t", lvb[i]);
2208
2209 /* End the line */
2210 seq_printf(m, "\n");
2211 return 0;
2212}
2213
2214static struct seq_operations ocfs2_dlm_seq_ops = {
2215 .start = ocfs2_dlm_seq_start,
2216 .stop = ocfs2_dlm_seq_stop,
2217 .next = ocfs2_dlm_seq_next,
2218 .show = ocfs2_dlm_seq_show,
2219};
2220
2221static int ocfs2_dlm_debug_release(struct inode *inode, struct file *file)
2222{
2223 struct seq_file *seq = (struct seq_file *) file->private_data;
2224 struct ocfs2_dlm_seq_priv *priv = seq->private;
2225 struct ocfs2_lock_res *res = &priv->p_iter_res;
2226
2227 ocfs2_remove_lockres_tracking(res);
2228 ocfs2_put_dlm_debug(priv->p_dlm_debug);
2229 return seq_release_private(inode, file);
2230}
2231
2232static int ocfs2_dlm_debug_open(struct inode *inode, struct file *file)
2233{
2234 int ret;
2235 struct ocfs2_dlm_seq_priv *priv;
2236 struct seq_file *seq;
2237 struct ocfs2_super *osb;
2238
2239 priv = kzalloc(sizeof(struct ocfs2_dlm_seq_priv), GFP_KERNEL);
2240 if (!priv) {
2241 ret = -ENOMEM;
2242 mlog_errno(ret);
2243 goto out;
2244 }
8e18e294 2245 osb = inode->i_private;
ccd979bd
MF		 2246 ocfs2_get_dlm_debug(osb->osb_dlm_debug);
2247 priv->p_dlm_debug = osb->osb_dlm_debug;
2248 INIT_LIST_HEAD(&priv->p_iter_res.l_debug_list);
2249
2250 ret = seq_open(file, &ocfs2_dlm_seq_ops);
2251 if (ret) {
2252 kfree(priv);
2253 mlog_errno(ret);
2254 goto out;
2255 }
2256
2257 seq = (struct seq_file *) file->private_data;
2258 seq->private = priv;
2259
2260 ocfs2_add_lockres_tracking(&priv->p_iter_res,
2261 priv->p_dlm_debug);
2262
2263out:
2264 return ret;
2265}
2266
4b6f5d20 2267static const struct file_operations ocfs2_dlm_debug_fops = {
ccd979bd
MF		 2268 .open = ocfs2_dlm_debug_open,
2269 .release = ocfs2_dlm_debug_release,
2270 .read = seq_read,
2271 .llseek = seq_lseek,
2272};
2273
2274static int ocfs2_dlm_init_debug(struct ocfs2_super *osb)
2275{
2276 int ret = 0;
2277 struct ocfs2_dlm_debug *dlm_debug = osb->osb_dlm_debug;
2278
2279 dlm_debug->d_locking_state = debugfs_create_file("locking_state",
2280 S_IFREG|S_IRUSR,
2281 osb->osb_debug_root,
2282 osb,
2283 &ocfs2_dlm_debug_fops);
2284 if (!dlm_debug->d_locking_state) {
2285 ret = -EINVAL;
2286 mlog(ML_ERROR,
2287 "Unable to create locking state debugfs file.\n");
2288 goto out;
2289 }
2290
2291 ocfs2_get_dlm_debug(dlm_debug);
2292out:
2293 return ret;
2294}
2295
2296static void ocfs2_dlm_shutdown_debug(struct ocfs2_super *osb)
2297{
2298 struct ocfs2_dlm_debug *dlm_debug = osb->osb_dlm_debug;
2299
2300 if (dlm_debug) {
2301 debugfs_remove(dlm_debug->d_locking_state);
2302 ocfs2_put_dlm_debug(dlm_debug);
2303 }
2304}
2305
2306int ocfs2_dlm_init(struct ocfs2_super *osb)
2307{
c271c5c2 2308 int status = 0;
ccd979bd 2309 u32 dlm_key;
c271c5c2 2310 struct dlm_ctxt *dlm = NULL;
ccd979bd
MF		 2311
2312 mlog_entry_void();
2313
c271c5c2
SM		 2314 if (ocfs2_mount_local(osb))
2315 goto local;
2316
ccd979bd
MF		 2317 status = ocfs2_dlm_init_debug(osb);
2318 if (status < 0) {
2319 mlog_errno(status);
2320 goto bail;
2321 }
2322
2323 /* launch vote thread */
78427043 2324 osb->vote_task = kthread_run(ocfs2_vote_thread, osb, "ocfs2vote");
ccd979bd
MF		 2325 if (IS_ERR(osb->vote_task)) {
2326 status = PTR_ERR(osb->vote_task);
2327 osb->vote_task = NULL;
2328 mlog_errno(status);
2329 goto bail;
2330 }
2331
2332 /* used by the dlm code to make message headers unique, each
2333 * node in this domain must agree on this. */
2334 dlm_key = crc32_le(0, osb->uuid_str, strlen(osb->uuid_str));
2335
2336 /* for now, uuid == domain */
2337 dlm = dlm_register_domain(osb->uuid_str, dlm_key);
2338 if (IS_ERR(dlm)) {
2339 status = PTR_ERR(dlm);
2340 mlog_errno(status);
2341 goto bail;
2342 }
2343
c271c5c2
SM		 2344 dlm_register_eviction_cb(dlm, &osb->osb_eviction_cb);
2345
2346local:
ccd979bd
MF		 2347 ocfs2_super_lock_res_init(&osb->osb_super_lockres, osb);
2348 ocfs2_rename_lock_res_init(&osb->osb_rename_lockres, osb);
2349
ccd979bd
MF		 2350 osb->dlm = dlm;
2351
2352 status = 0;
2353bail:
2354 if (status < 0) {
2355 ocfs2_dlm_shutdown_debug(osb);
2356 if (osb->vote_task)
2357 kthread_stop(osb->vote_task);
2358 }
2359
2360 mlog_exit(status);
2361 return status;
2362}
2363
2364void ocfs2_dlm_shutdown(struct ocfs2_super *osb)
2365{
2366 mlog_entry_void();
2367
2368 dlm_unregister_eviction_cb(&osb->osb_eviction_cb);
2369
2370 ocfs2_drop_osb_locks(osb);
2371
2372 if (osb->vote_task) {
2373 kthread_stop(osb->vote_task);
2374 osb->vote_task = NULL;
2375 }
2376
2377 ocfs2_lock_res_free(&osb->osb_super_lockres);
2378 ocfs2_lock_res_free(&osb->osb_rename_lockres);
2379
2380 dlm_unregister_domain(osb->dlm);
2381 osb->dlm = NULL;
2382
2383 ocfs2_dlm_shutdown_debug(osb);
2384
2385 mlog_exit_void();
2386}
2387
2a45f2d1 2388static void ocfs2_unlock_ast(void *opaque, enum dlm_status status)
ccd979bd
MF		 2389{
2390 struct ocfs2_lock_res *lockres = opaque;
2391 unsigned long flags;
2392
2393 mlog_entry_void();
2394
2395 mlog(0, "UNLOCK AST called on lock %s, action = %d\n", lockres->l_name,
2396 lockres->l_unlock_action);
2397
2398 spin_lock_irqsave(&lockres->l_lock, flags);
2399 /* We tried to cancel a convert request, but it was already
2400 * granted. All we want to do here is clear our unlock
2401 * state. The wake_up call done at the bottom is redundant
2402 * (ocfs2_prepare_cancel_convert doesn't sleep on this) but doesn't
2403 * hurt anything anyway */
2404 if (status == DLM_CANCELGRANT &&
2405 lockres->l_unlock_action == OCFS2_UNLOCK_CANCEL_CONVERT) {
2406 mlog(0, "Got cancelgrant for %s\n", lockres->l_name);
2407
2408 /* We don't clear the busy flag in this case as it
2409 * should have been cleared by the ast which the dlm
2410 * has called. */
2411 goto complete_unlock;
2412 }
2413
2414 if (status != DLM_NORMAL) {
2415 mlog(ML_ERROR, "Dlm passes status %d for lock %s, "
2416 "unlock_action %d\n", status, lockres->l_name,
2417 lockres->l_unlock_action);
2418 spin_unlock_irqrestore(&lockres->l_lock, flags);
2419 return;
2420 }
2421
2422 switch(lockres->l_unlock_action) {
2423 case OCFS2_UNLOCK_CANCEL_CONVERT:
2424 mlog(0, "Cancel convert success for %s\n", lockres->l_name);
2425 lockres->l_action = OCFS2_AST_INVALID;
2426 break;
2427 case OCFS2_UNLOCK_DROP_LOCK:
2428 lockres->l_level = LKM_IVMODE;
2429 break;
2430 default:
2431 BUG();
2432 }
2433
2434 lockres_clear_flags(lockres, OCFS2_LOCK_BUSY);
2435complete_unlock:
2436 lockres->l_unlock_action = OCFS2_UNLOCK_INVALID;
2437 spin_unlock_irqrestore(&lockres->l_lock, flags);
2438
2439 wake_up(&lockres->l_event);
2440
2441 mlog_exit_void();
2442}
2443
ccd979bd 2444static int ocfs2_drop_lock(struct ocfs2_super *osb,
0d5dc6c2 2445 struct ocfs2_lock_res *lockres)
ccd979bd
MF		 2446{
2447 enum dlm_status status;
2448 unsigned long flags;
b80fc012 2449 int lkm_flags = 0;
ccd979bd
MF		 2450
2451 /* We didn't get anywhere near actually using this lockres. */
2452 if (!(lockres->l_flags & OCFS2_LOCK_INITIALIZED))
2453 goto out;
2454
b80fc012
MF		 2455 if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB)
2456 lkm_flags |= LKM_VALBLK;
2457
ccd979bd
MF		 2458 spin_lock_irqsave(&lockres->l_lock, flags);
2459
2460 mlog_bug_on_msg(!(lockres->l_flags & OCFS2_LOCK_FREEING),
2461 "lockres %s, flags 0x%lx\n",
2462 lockres->l_name, lockres->l_flags);
2463
2464 while (lockres->l_flags & OCFS2_LOCK_BUSY) {
2465 mlog(0, "waiting on busy lock \"%s\": flags = %lx, action = "
2466 "%u, unlock_action = %u\n",
2467 lockres->l_name, lockres->l_flags, lockres->l_action,
2468 lockres->l_unlock_action);
2469
2470 spin_unlock_irqrestore(&lockres->l_lock, flags);
2471
2472 /* XXX: Today we just wait on any busy
2473 * locks... Perhaps we need to cancel converts in the
2474 * future? */
2475 ocfs2_wait_on_busy_lock(lockres);
2476
2477 spin_lock_irqsave(&lockres->l_lock, flags);
2478 }
2479
0d5dc6c2
MF		 2480 if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) {
2481 if (lockres->l_flags & OCFS2_LOCK_ATTACHED &&
2482 lockres->l_level == LKM_EXMODE &&
2483 !(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH))
2484 lockres->l_ops->set_lvb(lockres);
2485 }
ccd979bd
MF		 2486
2487 if (lockres->l_flags & OCFS2_LOCK_BUSY)
2488 mlog(ML_ERROR, "destroying busy lock: \"%s\"\n",
2489 lockres->l_name);
2490 if (lockres->l_flags & OCFS2_LOCK_BLOCKED)
2491 mlog(0, "destroying blocked lock: \"%s\"\n", lockres->l_name);
2492
2493 if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) {
2494 spin_unlock_irqrestore(&lockres->l_lock, flags);
2495 goto out;
2496 }
2497
2498 lockres_clear_flags(lockres, OCFS2_LOCK_ATTACHED);
2499
2500 /* make sure we never get here while waiting for an ast to
2501 * fire. */
2502 BUG_ON(lockres->l_action != OCFS2_AST_INVALID);
2503
2504 /* is this necessary? */
2505 lockres_or_flags(lockres, OCFS2_LOCK_BUSY);
2506 lockres->l_unlock_action = OCFS2_UNLOCK_DROP_LOCK;
2507 spin_unlock_irqrestore(&lockres->l_lock, flags);
2508
2509 mlog(0, "lock %s\n", lockres->l_name);
2510
b80fc012 2511 status = dlmunlock(osb->dlm, &lockres->l_lksb, lkm_flags,
2a45f2d1 2512 ocfs2_unlock_ast, lockres);
ccd979bd
MF		 2513 if (status != DLM_NORMAL) {
2514 ocfs2_log_dlm_error("dlmunlock", status, lockres);
2515 mlog(ML_ERROR, "lockres flags: %lu\n", lockres->l_flags);
2516 dlm_print_one_lock(lockres->l_lksb.lockid);
2517 BUG();
2518 }
2519 mlog(0, "lock %s, successfull return from dlmunlock\n",
2520 lockres->l_name);
2521
2522 ocfs2_wait_on_busy_lock(lockres);
2523out:
2524 mlog_exit(0);
2525 return 0;
2526}
2527
2528/* Mark the lockres as being dropped. It will no longer be
2529 * queued if blocking, but we still may have to wait on it
2530 * being dequeued from the vote thread before we can consider
2531 * it safe to drop.
2532 *
2533 * You can *not* attempt to call cluster_lock on this lockres anymore. */
2534void ocfs2_mark_lockres_freeing(struct ocfs2_lock_res *lockres)
2535{
2536 int status;
2537 struct ocfs2_mask_waiter mw;
2538 unsigned long flags;
2539
2540 ocfs2_init_mask_waiter(&mw);
2541
2542 spin_lock_irqsave(&lockres->l_lock, flags);
2543 lockres->l_flags |= OCFS2_LOCK_FREEING;
2544 while (lockres->l_flags & OCFS2_LOCK_QUEUED) {
2545 lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_QUEUED, 0);
2546 spin_unlock_irqrestore(&lockres->l_lock, flags);
2547
2548 mlog(0, "Waiting on lockres %s\n", lockres->l_name);
2549
2550 status = ocfs2_wait_for_mask(&mw);
2551 if (status)
2552 mlog_errno(status);
2553
2554 spin_lock_irqsave(&lockres->l_lock, flags);
2555 }
2556 spin_unlock_irqrestore(&lockres->l_lock, flags);
2557}
2558
d680efe9
MF		 2559void ocfs2_simple_drop_lockres(struct ocfs2_super *osb,
2560 struct ocfs2_lock_res *lockres)
ccd979bd 2561{
d680efe9 2562 int ret;
ccd979bd 2563
d680efe9 2564 ocfs2_mark_lockres_freeing(lockres);
0d5dc6c2 2565 ret = ocfs2_drop_lock(osb, lockres);
d680efe9
MF		 2566 if (ret)
2567 mlog_errno(ret);
2568}
ccd979bd 2569
d680efe9
MF		 2570static void ocfs2_drop_osb_locks(struct ocfs2_super *osb)
2571{
2572 ocfs2_simple_drop_lockres(osb, &osb->osb_super_lockres);
2573 ocfs2_simple_drop_lockres(osb, &osb->osb_rename_lockres);
ccd979bd
MF		 2574}
2575
ccd979bd
MF		 2576int ocfs2_drop_inode_locks(struct inode *inode)
2577{
2578 int status, err;
ccd979bd
MF		 2579
2580 mlog_entry_void();
2581
2582 /* No need to call ocfs2_mark_lockres_freeing here -
2583 * ocfs2_clear_inode has done it for us. */
2584
2585 err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb),
50008630 2586 &OCFS2_I(inode)->ip_open_lockres);
ccd979bd
MF		 2587 if (err < 0)
2588 mlog_errno(err);
2589
2590 status = err;
2591
50008630
TY		 2592 err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb),
2593 &OCFS2_I(inode)->ip_data_lockres);
2594 if (err < 0)
2595 mlog_errno(err);
2596 if (err < 0 && !status)
2597 status = err;
2598
ccd979bd 2599 err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb),
0d5dc6c2 2600 &OCFS2_I(inode)->ip_meta_lockres);
ccd979bd
MF		 2601 if (err < 0)
2602 mlog_errno(err);
2603 if (err < 0 && !status)
2604 status = err;
2605
2606 err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb),
0d5dc6c2 2607 &OCFS2_I(inode)->ip_rw_lockres);
ccd979bd
MF		 2608 if (err < 0)
2609 mlog_errno(err);
2610 if (err < 0 && !status)
2611 status = err;
2612
2613 mlog_exit(status);
2614 return status;
2615}
2616
2617static void ocfs2_prepare_downconvert(struct ocfs2_lock_res *lockres,
2618 int new_level)
2619{
2620 assert_spin_locked(&lockres->l_lock);
2621
2622 BUG_ON(lockres->l_blocking <= LKM_NLMODE);
2623
2624 if (lockres->l_level <= new_level) {
2625 mlog(ML_ERROR, "lockres->l_level (%u) <= new_level (%u)\n",
2626 lockres->l_level, new_level);
2627 BUG();
2628 }
2629
2630 mlog(0, "lock %s, new_level = %d, l_blocking = %d\n",
2631 lockres->l_name, new_level, lockres->l_blocking);
2632
2633 lockres->l_action = OCFS2_AST_DOWNCONVERT;
2634 lockres->l_requested = new_level;
2635 lockres_or_flags(lockres, OCFS2_LOCK_BUSY);
2636}
2637
2638static int ocfs2_downconvert_lock(struct ocfs2_super *osb,
2639 struct ocfs2_lock_res *lockres,
2640 int new_level,
2641 int lvb)
2642{
2643 int ret, dlm_flags = LKM_CONVERT;
2644 enum dlm_status status;
2645
2646 mlog_entry_void();
2647
2648 if (lvb)
2649 dlm_flags |= LKM_VALBLK;
2650
2651 status = dlmlock(osb->dlm,
2652 new_level,
2653 &lockres->l_lksb,
2654 dlm_flags,
2655 lockres->l_name,
f0681062 2656 OCFS2_LOCK_ID_MAX_LEN - 1,
e92d57df 2657 ocfs2_locking_ast,
ccd979bd 2658 lockres,
aa2623ad 2659 ocfs2_blocking_ast);
ccd979bd
MF		 2660 if (status != DLM_NORMAL) {
2661 ocfs2_log_dlm_error("dlmlock", status, lockres);
2662 ret = -EINVAL;
2663 ocfs2_recover_from_dlm_error(lockres, 1);
2664 goto bail;
2665 }
2666
2667 ret = 0;
2668bail:
2669 mlog_exit(ret);
2670 return ret;
2671}
2672
2673/* returns 1 when the caller should unlock and call dlmunlock */
2674static int ocfs2_prepare_cancel_convert(struct ocfs2_super *osb,
2675 struct ocfs2_lock_res *lockres)
2676{
2677 assert_spin_locked(&lockres->l_lock);
2678
2679 mlog_entry_void();
2680 mlog(0, "lock %s\n", lockres->l_name);
2681
2682 if (lockres->l_unlock_action == OCFS2_UNLOCK_CANCEL_CONVERT) {
2683 /* If we're already trying to cancel a lock conversion
2684 * then just drop the spinlock and allow the caller to
2685 * requeue this lock. */
2686
2687 mlog(0, "Lockres %s, skip convert\n", lockres->l_name);
2688 return 0;
2689 }
2690
2691 /* were we in a convert when we got the bast fire? */
2692 BUG_ON(lockres->l_action != OCFS2_AST_CONVERT &&
2693 lockres->l_action != OCFS2_AST_DOWNCONVERT);
2694 /* set things up for the unlockast to know to just
2695 * clear out the ast_action and unset busy, etc. */
2696 lockres->l_unlock_action = OCFS2_UNLOCK_CANCEL_CONVERT;
2697
2698 mlog_bug_on_msg(!(lockres->l_flags & OCFS2_LOCK_BUSY),
2699 "lock %s, invalid flags: 0x%lx\n",
2700 lockres->l_name, lockres->l_flags);
2701
2702 return 1;
2703}
2704
2705static int ocfs2_cancel_convert(struct ocfs2_super *osb,
2706 struct ocfs2_lock_res *lockres)
2707{
2708 int ret;
2709 enum dlm_status status;
2710
2711 mlog_entry_void();
2712 mlog(0, "lock %s\n", lockres->l_name);
2713
2714 ret = 0;
2715 status = dlmunlock(osb->dlm,
2716 &lockres->l_lksb,
2717 LKM_CANCEL,
2a45f2d1 2718 ocfs2_unlock_ast,
ccd979bd
MF		 2719 lockres);
2720 if (status != DLM_NORMAL) {
2721 ocfs2_log_dlm_error("dlmunlock", status, lockres);
2722 ret = -EINVAL;
2723 ocfs2_recover_from_dlm_error(lockres, 0);
2724 }
2725
2726 mlog(0, "lock %s return from dlmunlock\n", lockres->l_name);
2727
ccd979bd
MF		 2728 mlog_exit(ret);
2729 return ret;
2730}
2731
b5e500e2
MF		 2732static int ocfs2_unblock_lock(struct ocfs2_super *osb,
2733 struct ocfs2_lock_res *lockres,
2734 struct ocfs2_unblock_ctl *ctl)
ccd979bd
MF		 2735{
2736 unsigned long flags;
2737 int blocking;
2738 int new_level;
2739 int ret = 0;
5ef0d4ea 2740 int set_lvb = 0;
ccd979bd
MF		 2741
2742 mlog_entry_void();
2743
2744 spin_lock_irqsave(&lockres->l_lock, flags);
2745
2746 BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED));
2747
2748recheck:
2749 if (lockres->l_flags & OCFS2_LOCK_BUSY) {
d680efe9 2750 ctl->requeue = 1;
ccd979bd
MF		 2751 ret = ocfs2_prepare_cancel_convert(osb, lockres);
2752 spin_unlock_irqrestore(&lockres->l_lock, flags);
2753 if (ret) {
2754 ret = ocfs2_cancel_convert(osb, lockres);
2755 if (ret < 0)
2756 mlog_errno(ret);
2757 }
2758 goto leave;
2759 }
2760
2761 /* if we're blocking an exclusive and we have *any* holders,
2762 * then requeue. */
2763 if ((lockres->l_blocking == LKM_EXMODE)
f7fbfdd1
MF		 2764 && (lockres->l_ex_holders || lockres->l_ro_holders))
2765 goto leave_requeue;
ccd979bd
MF		 2766
2767 /* If it's a PR we're blocking, then only
2768 * requeue if we've got any EX holders */
2769 if (lockres->l_blocking == LKM_PRMODE &&
f7fbfdd1
MF		 2770 lockres->l_ex_holders)
2771 goto leave_requeue;
2772
2773 /*
2774 * Can we get a lock in this state if the holder counts are
2775 * zero? The meta data unblock code used to check this.
2776 */
2777 if ((lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH)
2778 && (lockres->l_flags & OCFS2_LOCK_REFRESHING))
2779 goto leave_requeue;
ccd979bd 2780
16d5b956
MF		 2781 new_level = ocfs2_highest_compat_lock_level(lockres->l_blocking);
2782
2783 if (lockres->l_ops->check_downconvert
2784 && !lockres->l_ops->check_downconvert(lockres, new_level))
2785 goto leave_requeue;
2786
ccd979bd
MF		 2787 /* If we get here, then we know that there are no more
2788 * incompatible holders (and anyone asking for an incompatible
2789 * lock is blocked). We can now downconvert the lock */
cc567d89 2790 if (!lockres->l_ops->downconvert_worker)
ccd979bd
MF		 2791 goto downconvert;
2792
2793 /* Some lockres types want to do a bit of work before
2794 * downconverting a lock. Allow that here. The worker function
2795 * may sleep, so we save off a copy of what we're blocking as
2796 * it may change while we're not holding the spin lock. */
2797 blocking = lockres->l_blocking;
2798 spin_unlock_irqrestore(&lockres->l_lock, flags);
2799
cc567d89 2800 ctl->unblock_action = lockres->l_ops->downconvert_worker(lockres, blocking);
d680efe9
MF		 2801
2802 if (ctl->unblock_action == UNBLOCK_STOP_POST)
2803 goto leave;
ccd979bd
MF		 2804
2805 spin_lock_irqsave(&lockres->l_lock, flags);
2806 if (blocking != lockres->l_blocking) {
2807 /* If this changed underneath us, then we can't drop
2808 * it just yet. */
2809 goto recheck;
2810 }
2811
2812downconvert:
d680efe9 2813 ctl->requeue = 0;
ccd979bd 2814
5ef0d4ea
MF		 2815 if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) {
2816 if (lockres->l_level == LKM_EXMODE)
2817 set_lvb = 1;
2818
2819 /*
2820 * We only set the lvb if the lock has been fully
2821 * refreshed - otherwise we risk setting stale
2822 * data. Otherwise, there's no need to actually clear
2823 * out the lvb here as it's value is still valid.
2824 */
2825 if (set_lvb && !(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH))
2826 lockres->l_ops->set_lvb(lockres);
2827 }
2828
ccd979bd
MF		 2829 ocfs2_prepare_downconvert(lockres, new_level);
2830 spin_unlock_irqrestore(&lockres->l_lock, flags);
5ef0d4ea 2831 ret = ocfs2_downconvert_lock(osb, lockres, new_level, set_lvb);
ccd979bd
MF		 2832leave:
2833 mlog_exit(ret);
2834 return ret;
f7fbfdd1
MF		 2835
2836leave_requeue:
2837 spin_unlock_irqrestore(&lockres->l_lock, flags);
2838 ctl->requeue = 1;
2839
2840 mlog_exit(0);
2841 return 0;
ccd979bd
MF		 2842}
2843
d680efe9
MF		 2844static int ocfs2_data_convert_worker(struct ocfs2_lock_res *lockres,
2845 int blocking)
ccd979bd
MF		 2846{
2847 struct inode *inode;
2848 struct address_space *mapping;
2849
ccd979bd
MF		 2850 inode = ocfs2_lock_res_inode(lockres);
2851 mapping = inode->i_mapping;
2852
7f4a2a97
MF		 2853 /*
2854 * We need this before the filemap_fdatawrite() so that it can
2855 * transfer the dirty bit from the PTE to the
2856 * page. Unfortunately this means that even for EX->PR
2857 * downconverts, we'll lose our mappings and have to build
2858 * them up again.
2859 */
2860 unmap_mapping_range(mapping, 0, 0, 0);
2861
ccd979bd 2862 if (filemap_fdatawrite(mapping)) {
b0697053
MF		 2863 mlog(ML_ERROR, "Could not sync inode %llu for downconvert!",
2864 (unsigned long long)OCFS2_I(inode)->ip_blkno);
ccd979bd
MF		 2865 }
2866 sync_mapping_buffers(mapping);
2867 if (blocking == LKM_EXMODE) {
2868 truncate_inode_pages(mapping, 0);
ccd979bd
MF		 2869 } else {
2870 /* We only need to wait on the I/O if we're not also
2871 * truncating pages because truncate_inode_pages waits
2872 * for us above. We don't truncate pages if we're
2873 * blocking anything < EXMODE because we want to keep
2874 * them around in that case. */
2875 filemap_fdatawait(mapping);
2876 }
2877
d680efe9 2878 return UNBLOCK_CONTINUE;
ccd979bd
MF		 2879}
2880
810d5aeb
MF		 2881static int ocfs2_check_meta_downconvert(struct ocfs2_lock_res *lockres,
2882 int new_level)
2883{
2884 struct inode *inode = ocfs2_lock_res_inode(lockres);
2885 int checkpointed = ocfs2_inode_fully_checkpointed(inode);
2886
2887 BUG_ON(new_level != LKM_NLMODE && new_level != LKM_PRMODE);
2888 BUG_ON(lockres->l_level != LKM_EXMODE && !checkpointed);
2889
2890 if (checkpointed)
2891 return 1;
2892
2893 ocfs2_start_checkpoint(OCFS2_SB(inode->i_sb));
2894 return 0;
2895}
2896
2897static void ocfs2_set_meta_lvb(struct ocfs2_lock_res *lockres)
2898{
2899 struct inode *inode = ocfs2_lock_res_inode(lockres);
2900
2901 __ocfs2_stuff_meta_lvb(inode);
2902}
2903
d680efe9
MF		 2904/*
2905 * Does the final reference drop on our dentry lock. Right now this
2906 * happens in the vote thread, but we could choose to simplify the
2907 * dlmglue API and push these off to the ocfs2_wq in the future.
2908 */
2909static void ocfs2_dentry_post_unlock(struct ocfs2_super *osb,
2910 struct ocfs2_lock_res *lockres)
2911{
2912 struct ocfs2_dentry_lock *dl = ocfs2_lock_res_dl(lockres);
2913 ocfs2_dentry_lock_put(osb, dl);
2914}
2915
2916/*
2917 * d_delete() matching dentries before the lock downconvert.
2918 *
2919 * At this point, any process waiting to destroy the
2920 * dentry_lock due to last ref count is stopped by the
2921 * OCFS2_LOCK_QUEUED flag.
2922 *
2923 * We have two potential problems
2924 *
2925 * 1) If we do the last reference drop on our dentry_lock (via dput)
2926 * we'll wind up in ocfs2_release_dentry_lock(), waiting on
2927 * the downconvert to finish. Instead we take an elevated
2928 * reference and push the drop until after we've completed our
2929 * unblock processing.
2930 *
2931 * 2) There might be another process with a final reference,
2932 * waiting on us to finish processing. If this is the case, we
2933 * detect it and exit out - there's no more dentries anyway.
2934 */
2935static int ocfs2_dentry_convert_worker(struct ocfs2_lock_res *lockres,
2936 int blocking)
2937{
2938 struct ocfs2_dentry_lock *dl = ocfs2_lock_res_dl(lockres);
2939 struct ocfs2_inode_info *oi = OCFS2_I(dl->dl_inode);
2940 struct dentry *dentry;
2941 unsigned long flags;
2942 int extra_ref = 0;
2943
2944 /*
2945 * This node is blocking another node from getting a read
2946 * lock. This happens when we've renamed within a
2947 * directory. We've forced the other nodes to d_delete(), but
2948 * we never actually dropped our lock because it's still
2949 * valid. The downconvert code will retain a PR for this node,
2950 * so there's no further work to do.
2951 */
2952 if (blocking == LKM_PRMODE)
2953 return UNBLOCK_CONTINUE;
2954
2955 /*
2956 * Mark this inode as potentially orphaned. The code in
2957 * ocfs2_delete_inode() will figure out whether it actually
2958 * needs to be freed or not.
2959 */
2960 spin_lock(&oi->ip_lock);
2961 oi->ip_flags |= OCFS2_INODE_MAYBE_ORPHANED;
2962 spin_unlock(&oi->ip_lock);
2963
2964 /*
2965 * Yuck. We need to make sure however that the check of
2966 * OCFS2_LOCK_FREEING and the extra reference are atomic with
2967 * respect to a reference decrement or the setting of that
2968 * flag.
2969 */
2970 spin_lock_irqsave(&lockres->l_lock, flags);
2971 spin_lock(&dentry_attach_lock);
2972 if (!(lockres->l_flags & OCFS2_LOCK_FREEING)
2973 && dl->dl_count) {
2974 dl->dl_count++;
2975 extra_ref = 1;
2976 }
2977 spin_unlock(&dentry_attach_lock);
2978 spin_unlock_irqrestore(&lockres->l_lock, flags);
2979
2980 mlog(0, "extra_ref = %d\n", extra_ref);
2981
2982 /*
2983 * We have a process waiting on us in ocfs2_dentry_iput(),
2984 * which means we can't have any more outstanding
2985 * aliases. There's no need to do any more work.
2986 */
2987 if (!extra_ref)
2988 return UNBLOCK_CONTINUE;
2989
2990 spin_lock(&dentry_attach_lock);
2991 while (1) {
2992 dentry = ocfs2_find_local_alias(dl->dl_inode,
2993 dl->dl_parent_blkno, 1);
2994 if (!dentry)
2995 break;
2996 spin_unlock(&dentry_attach_lock);
2997
2998 mlog(0, "d_delete(%.*s);\n", dentry->d_name.len,
2999 dentry->d_name.name);
3000
3001 /*
3002 * The following dcache calls may do an
3003 * iput(). Normally we don't want that from the
3004 * downconverting thread, but in this case it's ok
3005 * because the requesting node already has an
3006 * exclusive lock on the inode, so it can't be queued
3007 * for a downconvert.
3008 */
3009 d_delete(dentry);
3010 dput(dentry);
3011
3012 spin_lock(&dentry_attach_lock);
3013 }
3014 spin_unlock(&dentry_attach_lock);
3015
3016 /*
3017 * If we are the last holder of this dentry lock, there is no
3018 * reason to downconvert so skip straight to the unlock.
3019 */
3020 if (dl->dl_count == 1)
3021 return UNBLOCK_STOP_POST;
3022
3023 return UNBLOCK_CONTINUE_POST;
3024}
3025
ccd979bd
MF		 3026void ocfs2_process_blocked_lock(struct ocfs2_super *osb,
3027 struct ocfs2_lock_res *lockres)
3028{
3029 int status;
d680efe9 3030 struct ocfs2_unblock_ctl ctl = {0, 0,};
ccd979bd
MF		 3031 unsigned long flags;
3032
3033 /* Our reference to the lockres in this function can be
3034 * considered valid until we remove the OCFS2_LOCK_QUEUED
3035 * flag. */
3036
3037 mlog_entry_void();
3038
3039 BUG_ON(!lockres);
3040 BUG_ON(!lockres->l_ops);
ccd979bd
MF		 3041
3042 mlog(0, "lockres %s blocked.\n", lockres->l_name);
3043
3044 /* Detect whether a lock has been marked as going away while
3045 * the vote thread was processing other things. A lock can
3046 * still be marked with OCFS2_LOCK_FREEING after this check,
3047 * but short circuiting here will still save us some
3048 * performance. */
3049 spin_lock_irqsave(&lockres->l_lock, flags);
3050 if (lockres->l_flags & OCFS2_LOCK_FREEING)
3051 goto unqueue;
3052 spin_unlock_irqrestore(&lockres->l_lock, flags);
3053
b5e500e2 3054 status = ocfs2_unblock_lock(osb, lockres, &ctl);
ccd979bd
MF		 3055 if (status < 0)
3056 mlog_errno(status);
3057
3058 spin_lock_irqsave(&lockres->l_lock, flags);
3059unqueue:
d680efe9 3060 if (lockres->l_flags & OCFS2_LOCK_FREEING || !ctl.requeue) {
ccd979bd
MF		 3061 lockres_clear_flags(lockres, OCFS2_LOCK_QUEUED);
3062 } else
3063 ocfs2_schedule_blocked_lock(osb, lockres);
3064
3065 mlog(0, "lockres %s, requeue = %s.\n", lockres->l_name,
d680efe9 3066 ctl.requeue ? "yes" : "no");
ccd979bd
MF		 3067 spin_unlock_irqrestore(&lockres->l_lock, flags);
3068
d680efe9
MF		 3069 if (ctl.unblock_action != UNBLOCK_CONTINUE
3070 && lockres->l_ops->post_unlock)
3071 lockres->l_ops->post_unlock(osb, lockres);
3072
ccd979bd
MF		 3073 mlog_exit_void();
3074}
3075
3076static void ocfs2_schedule_blocked_lock(struct ocfs2_super *osb,
3077 struct ocfs2_lock_res *lockres)
3078{
3079 mlog_entry_void();
3080
3081 assert_spin_locked(&lockres->l_lock);
3082
3083 if (lockres->l_flags & OCFS2_LOCK_FREEING) {
3084 /* Do not schedule a lock for downconvert when it's on
3085 * the way to destruction - any nodes wanting access
3086 * to the resource will get it soon. */
3087 mlog(0, "Lockres %s won't be scheduled: flags 0x%lx\n",
3088 lockres->l_name, lockres->l_flags);
3089 return;
3090 }
3091
3092 lockres_or_flags(lockres, OCFS2_LOCK_QUEUED);
3093
3094 spin_lock(&osb->vote_task_lock);
3095 if (list_empty(&lockres->l_blocked_list)) {
3096 list_add_tail(&lockres->l_blocked_list,
3097 &osb->blocked_lock_list);
3098 osb->blocked_lock_count++;
3099 }
3100 spin_unlock(&osb->vote_task_lock);
3101
3102 mlog_exit_void();
3103}
kernel source for telekom puls (alcatel/mediatek)