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ocfs2: Use -errno instead of dlm_status for ocfs2_dlm_lock/unlock() API.
[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
ccd979bd
MF		 40#define MLOG_MASK_PREFIX ML_DLM_GLUE
41#include <cluster/masklog.h>
42
43#include "ocfs2.h"
d24fbcda 44#include "ocfs2_lockingver.h"
ccd979bd
MF		 45
46#include "alloc.h"
d680efe9 47#include "dcache.h"
ccd979bd
MF		 48#include "dlmglue.h"
49#include "extent_map.h"
7f1a37e3 50#include "file.h"
ccd979bd
MF		 51#include "heartbeat.h"
52#include "inode.h"
53#include "journal.h"
24ef1815 54#include "stackglue.h"
ccd979bd
MF		 55#include "slot_map.h"
56#include "super.h"
57#include "uptodate.h"
ccd979bd
MF		 58
59#include "buffer_head_io.h"
60
61struct ocfs2_mask_waiter {
62 struct list_head mw_item;
63 int mw_status;
64 struct completion mw_complete;
65 unsigned long mw_mask;
66 unsigned long mw_goal;
67};
68
54a7e755
MF		 69static struct ocfs2_super *ocfs2_get_dentry_osb(struct ocfs2_lock_res *lockres);
70static struct ocfs2_super *ocfs2_get_inode_osb(struct ocfs2_lock_res *lockres);
cf8e06f1 71static struct ocfs2_super *ocfs2_get_file_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 155 /*
34d024f8
MF		 156 * Optionally called in the downconvert thread after a
157 * successful downconvert. The lockres will not be referenced
158 * after this callback is called, so it is safe to free
159 * memory, etc.
0d5dc6c2
MF		 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
e63aecb6 228static struct ocfs2_lock_res_ops ocfs2_inode_inode_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,
f1f54068 232 .downconvert_worker = ocfs2_data_convert_worker,
b80fc012 233 .flags = LOCK_TYPE_REQUIRES_REFRESH|LOCK_TYPE_USES_LVB,
ccd979bd
MF		 234};
235
ccd979bd 236static struct ocfs2_lock_res_ops ocfs2_super_lops = {
f625c979 237 .flags = LOCK_TYPE_REQUIRES_REFRESH,
ccd979bd
MF		 238};
239
240static struct ocfs2_lock_res_ops ocfs2_rename_lops = {
f625c979 241 .flags = 0,
ccd979bd
MF		 242};
243
d680efe9 244static struct ocfs2_lock_res_ops ocfs2_dentry_lops = {
54a7e755 245 .get_osb = ocfs2_get_dentry_osb,
d680efe9 246 .post_unlock = ocfs2_dentry_post_unlock,
cc567d89 247 .downconvert_worker = ocfs2_dentry_convert_worker,
f625c979 248 .flags = 0,
d680efe9
MF		 249};
250
50008630
TY		 251static struct ocfs2_lock_res_ops ocfs2_inode_open_lops = {
252 .get_osb = ocfs2_get_inode_osb,
253 .flags = 0,
254};
255
cf8e06f1
MF		 256static struct ocfs2_lock_res_ops ocfs2_flock_lops = {
257 .get_osb = ocfs2_get_file_osb,
258 .flags = 0,
259};
260
d24fbcda
JB		 261/*
262 * This is the filesystem locking protocol version.
263 *
264 * Whenever the filesystem does new things with locks (adds or removes a
265 * lock, orders them differently, does different things underneath a lock),
266 * the version must be changed. The protocol is negotiated when joining
267 * the dlm domain. A node may join the domain if its major version is
268 * identical to all other nodes and its minor version is greater than
269 * or equal to all other nodes. When its minor version is greater than
270 * the other nodes, it will run at the minor version specified by the
271 * other nodes.
272 *
273 * If a locking change is made that will not be compatible with older
274 * versions, the major number must be increased and the minor version set
275 * to zero. If a change merely adds a behavior that can be disabled when
276 * speaking to older versions, the minor version must be increased. If a
277 * change adds a fully backwards compatible change (eg, LVB changes that
278 * are just ignored by older versions), the version does not need to be
279 * updated.
280 */
281const struct dlm_protocol_version ocfs2_locking_protocol = {
282 .pv_major = OCFS2_LOCKING_PROTOCOL_MAJOR,
283 .pv_minor = OCFS2_LOCKING_PROTOCOL_MINOR,
284};
285
ccd979bd
MF		 286static inline int ocfs2_is_inode_lock(struct ocfs2_lock_res *lockres)
287{
288 return lockres->l_type == OCFS2_LOCK_TYPE_META ||
50008630
TY		 289 lockres->l_type == OCFS2_LOCK_TYPE_RW ||
290 lockres->l_type == OCFS2_LOCK_TYPE_OPEN;
ccd979bd
MF		 291}
292
ccd979bd
MF		 293static inline struct inode *ocfs2_lock_res_inode(struct ocfs2_lock_res *lockres)
294{
295 BUG_ON(!ocfs2_is_inode_lock(lockres));
296
297 return (struct inode *) lockres->l_priv;
298}
299
d680efe9
MF		 300static inline struct ocfs2_dentry_lock *ocfs2_lock_res_dl(struct ocfs2_lock_res *lockres)
301{
302 BUG_ON(lockres->l_type != OCFS2_LOCK_TYPE_DENTRY);
303
304 return (struct ocfs2_dentry_lock *)lockres->l_priv;
305}
306
54a7e755
MF		 307static inline struct ocfs2_super *ocfs2_get_lockres_osb(struct ocfs2_lock_res *lockres)
308{
309 if (lockres->l_ops->get_osb)
310 return lockres->l_ops->get_osb(lockres);
311
312 return (struct ocfs2_super *)lockres->l_priv;
313}
314
ccd979bd
MF		 315static int ocfs2_lock_create(struct ocfs2_super *osb,
316 struct ocfs2_lock_res *lockres,
317 int level,
bd3e7610 318 u32 dlm_flags);
ccd979bd
MF		 319static inline int ocfs2_may_continue_on_blocked_lock(struct ocfs2_lock_res *lockres,
320 int wanted);
321static void ocfs2_cluster_unlock(struct ocfs2_super *osb,
322 struct ocfs2_lock_res *lockres,
323 int level);
324static inline void ocfs2_generic_handle_downconvert_action(struct ocfs2_lock_res *lockres);
325static inline void ocfs2_generic_handle_convert_action(struct ocfs2_lock_res *lockres);
326static inline void ocfs2_generic_handle_attach_action(struct ocfs2_lock_res *lockres);
327static int ocfs2_generic_handle_bast(struct ocfs2_lock_res *lockres, int level);
328static void ocfs2_schedule_blocked_lock(struct ocfs2_super *osb,
329 struct ocfs2_lock_res *lockres);
330static inline void ocfs2_recover_from_dlm_error(struct ocfs2_lock_res *lockres,
331 int convert);
7431cd7e
JB		 332#define ocfs2_log_dlm_error(_func, _err, _lockres) do { \
333 mlog(ML_ERROR, "DLM error %d while calling %s on resource %s\n", \
334 _err, _func, _lockres->l_name); \
ccd979bd 335} while (0)
34d024f8
MF		 336static int ocfs2_downconvert_thread(void *arg);
337static void ocfs2_downconvert_on_unlock(struct ocfs2_super *osb,
338 struct ocfs2_lock_res *lockres);
e63aecb6 339static int ocfs2_inode_lock_update(struct inode *inode,
ccd979bd
MF		 340 struct buffer_head **bh);
341static void ocfs2_drop_osb_locks(struct ocfs2_super *osb);
342static inline int ocfs2_highest_compat_lock_level(int level);
cf8e06f1
MF		 343static void ocfs2_prepare_downconvert(struct ocfs2_lock_res *lockres,
344 int new_level);
345static int ocfs2_downconvert_lock(struct ocfs2_super *osb,
346 struct ocfs2_lock_res *lockres,
347 int new_level,
348 int lvb);
349static int ocfs2_prepare_cancel_convert(struct ocfs2_super *osb,
350 struct ocfs2_lock_res *lockres);
351static int ocfs2_cancel_convert(struct ocfs2_super *osb,
352 struct ocfs2_lock_res *lockres);
353
ccd979bd 354
ccd979bd
MF		 355static void ocfs2_build_lock_name(enum ocfs2_lock_type type,
356 u64 blkno,
357 u32 generation,
358 char *name)
359{
360 int len;
361
362 mlog_entry_void();
363
364 BUG_ON(type >= OCFS2_NUM_LOCK_TYPES);
365
b0697053
MF		 366 len = snprintf(name, OCFS2_LOCK_ID_MAX_LEN, "%c%s%016llx%08x",
367 ocfs2_lock_type_char(type), OCFS2_LOCK_ID_PAD,
368 (long long)blkno, generation);
ccd979bd
MF		 369
370 BUG_ON(len != (OCFS2_LOCK_ID_MAX_LEN - 1));
371
372 mlog(0, "built lock resource with name: %s\n", name);
373
374 mlog_exit_void();
375}
376
34af946a 377static DEFINE_SPINLOCK(ocfs2_dlm_tracking_lock);
ccd979bd
MF		 378
379static void ocfs2_add_lockres_tracking(struct ocfs2_lock_res *res,
380 struct ocfs2_dlm_debug *dlm_debug)
381{
382 mlog(0, "Add tracking for lockres %s\n", res->l_name);
383
384 spin_lock(&ocfs2_dlm_tracking_lock);
385 list_add(&res->l_debug_list, &dlm_debug->d_lockres_tracking);
386 spin_unlock(&ocfs2_dlm_tracking_lock);
387}
388
389static void ocfs2_remove_lockres_tracking(struct ocfs2_lock_res *res)
390{
391 spin_lock(&ocfs2_dlm_tracking_lock);
392 if (!list_empty(&res->l_debug_list))
393 list_del_init(&res->l_debug_list);
394 spin_unlock(&ocfs2_dlm_tracking_lock);
395}
396
397static void ocfs2_lock_res_init_common(struct ocfs2_super *osb,
398 struct ocfs2_lock_res *res,
399 enum ocfs2_lock_type type,
ccd979bd
MF		 400 struct ocfs2_lock_res_ops *ops,
401 void *priv)
402{
ccd979bd
MF		 403 res->l_type = type;
404 res->l_ops = ops;
405 res->l_priv = priv;
406
bd3e7610
JB		 407 res->l_level = DLM_LOCK_IV;
408 res->l_requested = DLM_LOCK_IV;
409 res->l_blocking = DLM_LOCK_IV;
ccd979bd
MF		 410 res->l_action = OCFS2_AST_INVALID;
411 res->l_unlock_action = OCFS2_UNLOCK_INVALID;
412
413 res->l_flags = OCFS2_LOCK_INITIALIZED;
414
415 ocfs2_add_lockres_tracking(res, osb->osb_dlm_debug);
416}
417
418void ocfs2_lock_res_init_once(struct ocfs2_lock_res *res)
419{
420 /* This also clears out the lock status block */
421 memset(res, 0, sizeof(struct ocfs2_lock_res));
422 spin_lock_init(&res->l_lock);
423 init_waitqueue_head(&res->l_event);
424 INIT_LIST_HEAD(&res->l_blocked_list);
425 INIT_LIST_HEAD(&res->l_mask_waiters);
426}
427
428void ocfs2_inode_lock_res_init(struct ocfs2_lock_res *res,
429 enum ocfs2_lock_type type,
24c19ef4 430 unsigned int generation,
ccd979bd
MF		 431 struct inode *inode)
432{
433 struct ocfs2_lock_res_ops *ops;
434
435 switch(type) {
436 case OCFS2_LOCK_TYPE_RW:
437 ops = &ocfs2_inode_rw_lops;
438 break;
439 case OCFS2_LOCK_TYPE_META:
e63aecb6 440 ops = &ocfs2_inode_inode_lops;
ccd979bd 441 break;
50008630
TY		 442 case OCFS2_LOCK_TYPE_OPEN:
443 ops = &ocfs2_inode_open_lops;
444 break;
ccd979bd
MF		 445 default:
446 mlog_bug_on_msg(1, "type: %d\n", type);
447 ops = NULL; /* thanks, gcc */
448 break;
449 };
450
d680efe9 451 ocfs2_build_lock_name(type, OCFS2_I(inode)->ip_blkno,
24c19ef4 452 generation, res->l_name);
d680efe9
MF		 453 ocfs2_lock_res_init_common(OCFS2_SB(inode->i_sb), res, type, ops, inode);
454}
455
54a7e755
MF		 456static struct ocfs2_super *ocfs2_get_inode_osb(struct ocfs2_lock_res *lockres)
457{
458 struct inode *inode = ocfs2_lock_res_inode(lockres);
459
460 return OCFS2_SB(inode->i_sb);
461}
462
cf8e06f1
MF		 463static struct ocfs2_super *ocfs2_get_file_osb(struct ocfs2_lock_res *lockres)
464{
465 struct ocfs2_file_private *fp = lockres->l_priv;
466
467 return OCFS2_SB(fp->fp_file->f_mapping->host->i_sb);
468}
469
d680efe9
MF		 470static __u64 ocfs2_get_dentry_lock_ino(struct ocfs2_lock_res *lockres)
471{
472 __be64 inode_blkno_be;
473
474 memcpy(&inode_blkno_be, &lockres->l_name[OCFS2_DENTRY_LOCK_INO_START],
475 sizeof(__be64));
476
477 return be64_to_cpu(inode_blkno_be);
478}
479
54a7e755
MF		 480static struct ocfs2_super *ocfs2_get_dentry_osb(struct ocfs2_lock_res *lockres)
481{
482 struct ocfs2_dentry_lock *dl = lockres->l_priv;
483
484 return OCFS2_SB(dl->dl_inode->i_sb);
485}
486
d680efe9
MF		 487void ocfs2_dentry_lock_res_init(struct ocfs2_dentry_lock *dl,
488 u64 parent, struct inode *inode)
489{
490 int len;
491 u64 inode_blkno = OCFS2_I(inode)->ip_blkno;
492 __be64 inode_blkno_be = cpu_to_be64(inode_blkno);
493 struct ocfs2_lock_res *lockres = &dl->dl_lockres;
494
495 ocfs2_lock_res_init_once(lockres);
496
497 /*
498 * Unfortunately, the standard lock naming scheme won't work
499 * here because we have two 16 byte values to use. Instead,
500 * we'll stuff the inode number as a binary value. We still
501 * want error prints to show something without garbling the
502 * display, so drop a null byte in there before the inode
503 * number. A future version of OCFS2 will likely use all
504 * binary lock names. The stringified names have been a
505 * tremendous aid in debugging, but now that the debugfs
506 * interface exists, we can mangle things there if need be.
507 *
508 * NOTE: We also drop the standard "pad" value (the total lock
509 * name size stays the same though - the last part is all
510 * zeros due to the memset in ocfs2_lock_res_init_once()
511 */
512 len = snprintf(lockres->l_name, OCFS2_DENTRY_LOCK_INO_START,
513 "%c%016llx",
514 ocfs2_lock_type_char(OCFS2_LOCK_TYPE_DENTRY),
515 (long long)parent);
516
517 BUG_ON(len != (OCFS2_DENTRY_LOCK_INO_START - 1));
518
519 memcpy(&lockres->l_name[OCFS2_DENTRY_LOCK_INO_START], &inode_blkno_be,
520 sizeof(__be64));
521
522 ocfs2_lock_res_init_common(OCFS2_SB(inode->i_sb), lockres,
523 OCFS2_LOCK_TYPE_DENTRY, &ocfs2_dentry_lops,
524 dl);
ccd979bd
MF		 525}
526
527static void ocfs2_super_lock_res_init(struct ocfs2_lock_res *res,
528 struct ocfs2_super *osb)
529{
530 /* Superblock lockres doesn't come from a slab so we call init
531 * once on it manually. */
532 ocfs2_lock_res_init_once(res);
d680efe9
MF		 533 ocfs2_build_lock_name(OCFS2_LOCK_TYPE_SUPER, OCFS2_SUPER_BLOCK_BLKNO,
534 0, res->l_name);
ccd979bd 535 ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_SUPER,
ccd979bd
MF		 536 &ocfs2_super_lops, osb);
537}
538
539static void ocfs2_rename_lock_res_init(struct ocfs2_lock_res *res,
540 struct ocfs2_super *osb)
541{
542 /* Rename lockres doesn't come from a slab so we call init
543 * once on it manually. */
544 ocfs2_lock_res_init_once(res);
d680efe9
MF		 545 ocfs2_build_lock_name(OCFS2_LOCK_TYPE_RENAME, 0, 0, res->l_name);
546 ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_RENAME,
ccd979bd
MF		 547 &ocfs2_rename_lops, osb);
548}
549
cf8e06f1
MF		 550void ocfs2_file_lock_res_init(struct ocfs2_lock_res *lockres,
551 struct ocfs2_file_private *fp)
552{
553 struct inode *inode = fp->fp_file->f_mapping->host;
554 struct ocfs2_inode_info *oi = OCFS2_I(inode);
555
556 ocfs2_lock_res_init_once(lockres);
557 ocfs2_build_lock_name(OCFS2_LOCK_TYPE_FLOCK, oi->ip_blkno,
558 inode->i_generation, lockres->l_name);
559 ocfs2_lock_res_init_common(OCFS2_SB(inode->i_sb), lockres,
560 OCFS2_LOCK_TYPE_FLOCK, &ocfs2_flock_lops,
561 fp);
562 lockres->l_flags |= OCFS2_LOCK_NOCACHE;
563}
564
ccd979bd
MF		 565void ocfs2_lock_res_free(struct ocfs2_lock_res *res)
566{
567 mlog_entry_void();
568
569 if (!(res->l_flags & OCFS2_LOCK_INITIALIZED))
570 return;
571
572 ocfs2_remove_lockres_tracking(res);
573
574 mlog_bug_on_msg(!list_empty(&res->l_blocked_list),
575 "Lockres %s is on the blocked list\n",
576 res->l_name);
577 mlog_bug_on_msg(!list_empty(&res->l_mask_waiters),
578 "Lockres %s has mask waiters pending\n",
579 res->l_name);
580 mlog_bug_on_msg(spin_is_locked(&res->l_lock),
581 "Lockres %s is locked\n",
582 res->l_name);
583 mlog_bug_on_msg(res->l_ro_holders,
584 "Lockres %s has %u ro holders\n",
585 res->l_name, res->l_ro_holders);
586 mlog_bug_on_msg(res->l_ex_holders,
587 "Lockres %s has %u ex holders\n",
588 res->l_name, res->l_ex_holders);
589
590 /* Need to clear out the lock status block for the dlm */
591 memset(&res->l_lksb, 0, sizeof(res->l_lksb));
592
593 res->l_flags = 0UL;
594 mlog_exit_void();
595}
596
597static inline void ocfs2_inc_holders(struct ocfs2_lock_res *lockres,
598 int level)
599{
600 mlog_entry_void();
601
602 BUG_ON(!lockres);
603
604 switch(level) {
bd3e7610 605 case DLM_LOCK_EX:
ccd979bd
MF		 606 lockres->l_ex_holders++;
607 break;
bd3e7610 608 case DLM_LOCK_PR:
ccd979bd
MF		 609 lockres->l_ro_holders++;
610 break;
611 default:
612 BUG();
613 }
614
615 mlog_exit_void();
616}
617
618static inline void ocfs2_dec_holders(struct ocfs2_lock_res *lockres,
619 int level)
620{
621 mlog_entry_void();
622
623 BUG_ON(!lockres);
624
625 switch(level) {
bd3e7610 626 case DLM_LOCK_EX:
ccd979bd
MF		 627 BUG_ON(!lockres->l_ex_holders);
628 lockres->l_ex_holders--;
629 break;
bd3e7610 630 case DLM_LOCK_PR:
ccd979bd
MF		 631 BUG_ON(!lockres->l_ro_holders);
632 lockres->l_ro_holders--;
633 break;
634 default:
635 BUG();
636 }
637 mlog_exit_void();
638}
639
640/* WARNING: This function lives in a world where the only three lock
641 * levels are EX, PR, and NL. It *will* have to be adjusted when more
642 * lock types are added. */
643static inline int ocfs2_highest_compat_lock_level(int level)
644{
bd3e7610 645 int new_level = DLM_LOCK_EX;
ccd979bd 646
bd3e7610
JB		 647 if (level == DLM_LOCK_EX)
648 new_level = DLM_LOCK_NL;
649 else if (level == DLM_LOCK_PR)
650 new_level = DLM_LOCK_PR;
ccd979bd
MF		 651 return new_level;
652}
653
654static void lockres_set_flags(struct ocfs2_lock_res *lockres,
655 unsigned long newflags)
656{
800deef3 657 struct ocfs2_mask_waiter *mw, *tmp;
ccd979bd
MF		 658
659 assert_spin_locked(&lockres->l_lock);
660
661 lockres->l_flags = newflags;
662
800deef3 663 list_for_each_entry_safe(mw, tmp, &lockres->l_mask_waiters, mw_item) {
ccd979bd
MF		 664 if ((lockres->l_flags & mw->mw_mask) != mw->mw_goal)
665 continue;
666
667 list_del_init(&mw->mw_item);
668 mw->mw_status = 0;
669 complete(&mw->mw_complete);
670 }
671}
672static void lockres_or_flags(struct ocfs2_lock_res *lockres, unsigned long or)
673{
674 lockres_set_flags(lockres, lockres->l_flags | or);
675}
676static void lockres_clear_flags(struct ocfs2_lock_res *lockres,
677 unsigned long clear)
678{
679 lockres_set_flags(lockres, lockres->l_flags & ~clear);
680}
681
682static inline void ocfs2_generic_handle_downconvert_action(struct ocfs2_lock_res *lockres)
683{
684 mlog_entry_void();
685
686 BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY));
687 BUG_ON(!(lockres->l_flags & OCFS2_LOCK_ATTACHED));
688 BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED));
bd3e7610 689 BUG_ON(lockres->l_blocking <= DLM_LOCK_NL);
ccd979bd
MF		 690
691 lockres->l_level = lockres->l_requested;
692 if (lockres->l_level <=
693 ocfs2_highest_compat_lock_level(lockres->l_blocking)) {
bd3e7610 694 lockres->l_blocking = DLM_LOCK_NL;
ccd979bd
MF		 695 lockres_clear_flags(lockres, OCFS2_LOCK_BLOCKED);
696 }
697 lockres_clear_flags(lockres, OCFS2_LOCK_BUSY);
698
699 mlog_exit_void();
700}
701
702static inline void ocfs2_generic_handle_convert_action(struct ocfs2_lock_res *lockres)
703{
704 mlog_entry_void();
705
706 BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY));
707 BUG_ON(!(lockres->l_flags & OCFS2_LOCK_ATTACHED));
708
709 /* Convert from RO to EX doesn't really need anything as our
710 * information is already up to data. Convert from NL to
711 * *anything* however should mark ourselves as needing an
712 * update */
bd3e7610 713 if (lockres->l_level == DLM_LOCK_NL &&
f625c979 714 lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH)
ccd979bd
MF		 715 lockres_or_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH);
716
717 lockres->l_level = lockres->l_requested;
718 lockres_clear_flags(lockres, OCFS2_LOCK_BUSY);
719
720 mlog_exit_void();
721}
722
723static inline void ocfs2_generic_handle_attach_action(struct ocfs2_lock_res *lockres)
724{
725 mlog_entry_void();
726
3cf0c507 727 BUG_ON((!(lockres->l_flags & OCFS2_LOCK_BUSY)));
ccd979bd
MF		 728 BUG_ON(lockres->l_flags & OCFS2_LOCK_ATTACHED);
729
bd3e7610 730 if (lockres->l_requested > DLM_LOCK_NL &&
f625c979
MF		 731 !(lockres->l_flags & OCFS2_LOCK_LOCAL) &&
732 lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH)
ccd979bd
MF		 733 lockres_or_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH);
734
735 lockres->l_level = lockres->l_requested;
736 lockres_or_flags(lockres, OCFS2_LOCK_ATTACHED);
737 lockres_clear_flags(lockres, OCFS2_LOCK_BUSY);
738
739 mlog_exit_void();
740}
741
ccd979bd
MF		 742static int ocfs2_generic_handle_bast(struct ocfs2_lock_res *lockres,
743 int level)
744{
745 int needs_downconvert = 0;
746 mlog_entry_void();
747
748 assert_spin_locked(&lockres->l_lock);
749
750 lockres_or_flags(lockres, OCFS2_LOCK_BLOCKED);
751
752 if (level > lockres->l_blocking) {
753 /* only schedule a downconvert if we haven't already scheduled
754 * one that goes low enough to satisfy the level we're
755 * blocking. this also catches the case where we get
756 * duplicate BASTs */
757 if (ocfs2_highest_compat_lock_level(level) <
758 ocfs2_highest_compat_lock_level(lockres->l_blocking))
759 needs_downconvert = 1;
760
761 lockres->l_blocking = level;
762 }
763
764 mlog_exit(needs_downconvert);
765 return needs_downconvert;
766}
767
aa2623ad 768static void ocfs2_blocking_ast(void *opaque, int level)
ccd979bd 769{
aa2623ad
MF		 770 struct ocfs2_lock_res *lockres = opaque;
771 struct ocfs2_super *osb = ocfs2_get_lockres_osb(lockres);
ccd979bd
MF		 772 int needs_downconvert;
773 unsigned long flags;
774
bd3e7610 775 BUG_ON(level <= DLM_LOCK_NL);
ccd979bd 776
aa2623ad
MF		 777 mlog(0, "BAST fired for lockres %s, blocking %d, level %d type %s\n",
778 lockres->l_name, level, lockres->l_level,
779 ocfs2_lock_type_string(lockres->l_type));
780
cf8e06f1
MF		 781 /*
782 * We can skip the bast for locks which don't enable caching -
783 * they'll be dropped at the earliest possible time anyway.
784 */
785 if (lockres->l_flags & OCFS2_LOCK_NOCACHE)
786 return;
787
ccd979bd
MF		 788 spin_lock_irqsave(&lockres->l_lock, flags);
789 needs_downconvert = ocfs2_generic_handle_bast(lockres, level);
790 if (needs_downconvert)
791 ocfs2_schedule_blocked_lock(osb, lockres);
792 spin_unlock_irqrestore(&lockres->l_lock, flags);
793
d680efe9
MF		 794 wake_up(&lockres->l_event);
795
34d024f8 796 ocfs2_wake_downconvert_thread(osb);
ccd979bd
MF		 797}
798
e92d57df 799static void ocfs2_locking_ast(void *opaque)
ccd979bd 800{
e92d57df 801 struct ocfs2_lock_res *lockres = opaque;
ccd979bd
MF		 802 struct dlm_lockstatus *lksb = &lockres->l_lksb;
803 unsigned long flags;
804
805 spin_lock_irqsave(&lockres->l_lock, flags);
806
807 if (lksb->status != DLM_NORMAL) {
808 mlog(ML_ERROR, "lockres %s: lksb status value of %u!\n",
809 lockres->l_name, lksb->status);
810 spin_unlock_irqrestore(&lockres->l_lock, flags);
811 return;
812 }
813
814 switch(lockres->l_action) {
815 case OCFS2_AST_ATTACH:
816 ocfs2_generic_handle_attach_action(lockres);
e92d57df 817 lockres_clear_flags(lockres, OCFS2_LOCK_LOCAL);
ccd979bd
MF		 818 break;
819 case OCFS2_AST_CONVERT:
820 ocfs2_generic_handle_convert_action(lockres);
821 break;
822 case OCFS2_AST_DOWNCONVERT:
823 ocfs2_generic_handle_downconvert_action(lockres);
824 break;
825 default:
e92d57df
MF		 826 mlog(ML_ERROR, "lockres %s: ast fired with invalid action: %u "
827 "lockres flags = 0x%lx, unlock action: %u\n",
828 lockres->l_name, lockres->l_action, lockres->l_flags,
829 lockres->l_unlock_action);
ccd979bd
MF		 830 BUG();
831 }
832
ccd979bd
MF		 833 /* set it to something invalid so if we get called again we
834 * can catch it. */
835 lockres->l_action = OCFS2_AST_INVALID;
ccd979bd
MF		 836
837 wake_up(&lockres->l_event);
d680efe9 838 spin_unlock_irqrestore(&lockres->l_lock, flags);
ccd979bd
MF		 839}
840
ccd979bd
MF		 841static inline void ocfs2_recover_from_dlm_error(struct ocfs2_lock_res *lockres,
842 int convert)
843{
844 unsigned long flags;
845
846 mlog_entry_void();
847 spin_lock_irqsave(&lockres->l_lock, flags);
848 lockres_clear_flags(lockres, OCFS2_LOCK_BUSY);
849 if (convert)
850 lockres->l_action = OCFS2_AST_INVALID;
851 else
852 lockres->l_unlock_action = OCFS2_UNLOCK_INVALID;
853 spin_unlock_irqrestore(&lockres->l_lock, flags);
854
855 wake_up(&lockres->l_event);
856 mlog_exit_void();
857}
858
859/* Note: If we detect another process working on the lock (i.e.,
860 * OCFS2_LOCK_BUSY), we'll bail out returning 0. It's up to the caller
861 * to do the right thing in that case.
862 */
863static int ocfs2_lock_create(struct ocfs2_super *osb,
864 struct ocfs2_lock_res *lockres,
865 int level,
bd3e7610 866 u32 dlm_flags)
ccd979bd
MF		 867{
868 int ret = 0;
ccd979bd
MF		 869 unsigned long flags;
870
871 mlog_entry_void();
872
bd3e7610 873 mlog(0, "lock %s, level = %d, flags = %u\n", lockres->l_name, level,
ccd979bd
MF		 874 dlm_flags);
875
876 spin_lock_irqsave(&lockres->l_lock, flags);
877 if ((lockres->l_flags & OCFS2_LOCK_ATTACHED) ||
878 (lockres->l_flags & OCFS2_LOCK_BUSY)) {
879 spin_unlock_irqrestore(&lockres->l_lock, flags);
880 goto bail;
881 }
882
883 lockres->l_action = OCFS2_AST_ATTACH;
884 lockres->l_requested = level;
885 lockres_or_flags(lockres, OCFS2_LOCK_BUSY);
886 spin_unlock_irqrestore(&lockres->l_lock, flags);
887
7431cd7e
JB		 888 ret = ocfs2_dlm_lock(osb->dlm,
889 level,
890 &lockres->l_lksb,
891 dlm_flags,
892 lockres->l_name,
893 OCFS2_LOCK_ID_MAX_LEN - 1,
894 lockres);
895 if (ret) {
896 ocfs2_log_dlm_error("ocfs2_dlm_lock", ret, lockres);
ccd979bd
MF		 897 ocfs2_recover_from_dlm_error(lockres, 1);
898 }
899
7431cd7e 900 mlog(0, "lock %s, return from ocfs2_dlm_lock\n", lockres->l_name);
ccd979bd
MF		 901
902bail:
903 mlog_exit(ret);
904 return ret;
905}
906
907static inline int ocfs2_check_wait_flag(struct ocfs2_lock_res *lockres,
908 int flag)
909{
910 unsigned long flags;
911 int ret;
912
913 spin_lock_irqsave(&lockres->l_lock, flags);
914 ret = lockres->l_flags & flag;
915 spin_unlock_irqrestore(&lockres->l_lock, flags);
916
917 return ret;
918}
919
920static inline void ocfs2_wait_on_busy_lock(struct ocfs2_lock_res *lockres)
921
922{
923 wait_event(lockres->l_event,
924 !ocfs2_check_wait_flag(lockres, OCFS2_LOCK_BUSY));
925}
926
927static inline void ocfs2_wait_on_refreshing_lock(struct ocfs2_lock_res *lockres)
928
929{
930 wait_event(lockres->l_event,
931 !ocfs2_check_wait_flag(lockres, OCFS2_LOCK_REFRESHING));
932}
933
934/* predict what lock level we'll be dropping down to on behalf
935 * of another node, and return true if the currently wanted
936 * level will be compatible with it. */
937static inline int ocfs2_may_continue_on_blocked_lock(struct ocfs2_lock_res *lockres,
938 int wanted)
939{
940 BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED));
941
942 return wanted <= ocfs2_highest_compat_lock_level(lockres->l_blocking);
943}
944
945static void ocfs2_init_mask_waiter(struct ocfs2_mask_waiter *mw)
946{
947 INIT_LIST_HEAD(&mw->mw_item);
948 init_completion(&mw->mw_complete);
949}
950
951static int ocfs2_wait_for_mask(struct ocfs2_mask_waiter *mw)
952{
953 wait_for_completion(&mw->mw_complete);
954 /* Re-arm the completion in case we want to wait on it again */
955 INIT_COMPLETION(mw->mw_complete);
956 return mw->mw_status;
957}
958
959static void lockres_add_mask_waiter(struct ocfs2_lock_res *lockres,
960 struct ocfs2_mask_waiter *mw,
961 unsigned long mask,
962 unsigned long goal)
963{
964 BUG_ON(!list_empty(&mw->mw_item));
965
966 assert_spin_locked(&lockres->l_lock);
967
968 list_add_tail(&mw->mw_item, &lockres->l_mask_waiters);
969 mw->mw_mask = mask;
970 mw->mw_goal = goal;
971}
972
973/* returns 0 if the mw that was removed was already satisfied, -EBUSY
974 * if the mask still hadn't reached its goal */
975static int lockres_remove_mask_waiter(struct ocfs2_lock_res *lockres,
976 struct ocfs2_mask_waiter *mw)
977{
978 unsigned long flags;
979 int ret = 0;
980
981 spin_lock_irqsave(&lockres->l_lock, flags);
982 if (!list_empty(&mw->mw_item)) {
983 if ((lockres->l_flags & mw->mw_mask) != mw->mw_goal)
984 ret = -EBUSY;
985
986 list_del_init(&mw->mw_item);
987 init_completion(&mw->mw_complete);
988 }
989 spin_unlock_irqrestore(&lockres->l_lock, flags);
990
991 return ret;
992
993}
994
cf8e06f1
MF		 995static int ocfs2_wait_for_mask_interruptible(struct ocfs2_mask_waiter *mw,
996 struct ocfs2_lock_res *lockres)
997{
998 int ret;
999
1000 ret = wait_for_completion_interruptible(&mw->mw_complete);
1001 if (ret)
1002 lockres_remove_mask_waiter(lockres, mw);
1003 else
1004 ret = mw->mw_status;
1005 /* Re-arm the completion in case we want to wait on it again */
1006 INIT_COMPLETION(mw->mw_complete);
1007 return ret;
1008}
1009
ccd979bd
MF		 1010static int ocfs2_cluster_lock(struct ocfs2_super *osb,
1011 struct ocfs2_lock_res *lockres,
1012 int level,
bd3e7610 1013 u32 lkm_flags,
ccd979bd
MF		 1014 int arg_flags)
1015{
1016 struct ocfs2_mask_waiter mw;
ccd979bd
MF		 1017 int wait, catch_signals = !(osb->s_mount_opt & OCFS2_MOUNT_NOINTR);
1018 int ret = 0; /* gcc doesn't realize wait = 1 guarantees ret is set */
1019 unsigned long flags;
1020
1021 mlog_entry_void();
1022
1023 ocfs2_init_mask_waiter(&mw);
1024
b80fc012 1025 if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB)
bd3e7610 1026 lkm_flags |= DLM_LKF_VALBLK;
b80fc012 1027
ccd979bd
MF		 1028again:
1029 wait = 0;
1030
1031 if (catch_signals && signal_pending(current)) {
1032 ret = -ERESTARTSYS;
1033 goto out;
1034 }
1035
1036 spin_lock_irqsave(&lockres->l_lock, flags);
1037
1038 mlog_bug_on_msg(lockres->l_flags & OCFS2_LOCK_FREEING,
1039 "Cluster lock called on freeing lockres %s! flags "
1040 "0x%lx\n", lockres->l_name, lockres->l_flags);
1041
1042 /* We only compare against the currently granted level
1043 * here. If the lock is blocked waiting on a downconvert,
1044 * we'll get caught below. */
1045 if (lockres->l_flags & OCFS2_LOCK_BUSY &&
1046 level > lockres->l_level) {
1047 /* is someone sitting in dlm_lock? If so, wait on
1048 * them. */
1049 lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0);
1050 wait = 1;
1051 goto unlock;
1052 }
1053
ccd979bd
MF		 1054 if (lockres->l_flags & OCFS2_LOCK_BLOCKED &&
1055 !ocfs2_may_continue_on_blocked_lock(lockres, level)) {
1056 /* is the lock is currently blocked on behalf of
1057 * another node */
1058 lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BLOCKED, 0);
1059 wait = 1;
1060 goto unlock;
1061 }
1062
1063 if (level > lockres->l_level) {
1064 if (lockres->l_action != OCFS2_AST_INVALID)
1065 mlog(ML_ERROR, "lockres %s has action %u pending\n",
1066 lockres->l_name, lockres->l_action);
1067
019d1b22
MF		 1068 if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) {
1069 lockres->l_action = OCFS2_AST_ATTACH;
bd3e7610 1070 lkm_flags &= ~DLM_LKF_CONVERT;
019d1b22
MF		 1071 } else {
1072 lockres->l_action = OCFS2_AST_CONVERT;
bd3e7610 1073 lkm_flags |= DLM_LKF_CONVERT;
019d1b22
MF		 1074 }
1075
ccd979bd
MF		 1076 lockres->l_requested = level;
1077 lockres_or_flags(lockres, OCFS2_LOCK_BUSY);
1078 spin_unlock_irqrestore(&lockres->l_lock, flags);
1079
bd3e7610
JB		 1080 BUG_ON(level == DLM_LOCK_IV);
1081 BUG_ON(level == DLM_LOCK_NL);
ccd979bd
MF		 1082
1083 mlog(0, "lock %s, convert from %d to level = %d\n",
1084 lockres->l_name, lockres->l_level, level);
1085
1086 /* call dlm_lock to upgrade lock now */
7431cd7e
JB		 1087 ret = ocfs2_dlm_lock(osb->dlm,
1088 level,
1089 &lockres->l_lksb,
1090 lkm_flags,
1091 lockres->l_name,
1092 OCFS2_LOCK_ID_MAX_LEN - 1,
1093 lockres);
1094 if (ret) {
1095 if (!(lkm_flags & DLM_LKF_NOQUEUE) ||
1096 (ret != -EAGAIN)) {
24ef1815 1097 ocfs2_log_dlm_error("ocfs2_dlm_lock",
7431cd7e 1098 ret, lockres);
ccd979bd
MF		 1099 }
1100 ocfs2_recover_from_dlm_error(lockres, 1);
1101 goto out;
1102 }
1103
24ef1815 1104 mlog(0, "lock %s, successfull return from ocfs2_dlm_lock\n",
ccd979bd
MF		 1105 lockres->l_name);
1106
1107 /* At this point we've gone inside the dlm and need to
1108 * complete our work regardless. */
1109 catch_signals = 0;
1110
1111 /* wait for busy to clear and carry on */
1112 goto again;
1113 }
1114
1115 /* Ok, if we get here then we're good to go. */
1116 ocfs2_inc_holders(lockres, level);
1117
1118 ret = 0;
1119unlock:
1120 spin_unlock_irqrestore(&lockres->l_lock, flags);
1121out:
1122 /*
1123 * This is helping work around a lock inversion between the page lock
1124 * and dlm locks. One path holds the page lock while calling aops
1125 * which block acquiring dlm locks. The voting thread holds dlm
1126 * locks while acquiring page locks while down converting data locks.
1127 * This block is helping an aop path notice the inversion and back
1128 * off to unlock its page lock before trying the dlm lock again.
1129 */
1130 if (wait && arg_flags & OCFS2_LOCK_NONBLOCK &&
1131 mw.mw_mask & (OCFS2_LOCK_BUSY|OCFS2_LOCK_BLOCKED)) {
1132 wait = 0;
1133 if (lockres_remove_mask_waiter(lockres, &mw))
1134 ret = -EAGAIN;
1135 else
1136 goto again;
1137 }
1138 if (wait) {
1139 ret = ocfs2_wait_for_mask(&mw);
1140 if (ret == 0)
1141 goto again;
1142 mlog_errno(ret);
1143 }
1144
1145 mlog_exit(ret);
1146 return ret;
1147}
1148
1149static void ocfs2_cluster_unlock(struct ocfs2_super *osb,
1150 struct ocfs2_lock_res *lockres,
1151 int level)
1152{
1153 unsigned long flags;
1154
1155 mlog_entry_void();
1156 spin_lock_irqsave(&lockres->l_lock, flags);
1157 ocfs2_dec_holders(lockres, level);
34d024f8 1158 ocfs2_downconvert_on_unlock(osb, lockres);
ccd979bd
MF		 1159 spin_unlock_irqrestore(&lockres->l_lock, flags);
1160 mlog_exit_void();
1161}
1162
da66116e
AB		 1163static int ocfs2_create_new_lock(struct ocfs2_super *osb,
1164 struct ocfs2_lock_res *lockres,
1165 int ex,
1166 int local)
ccd979bd 1167{
bd3e7610 1168 int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR;
ccd979bd 1169 unsigned long flags;
bd3e7610 1170 u32 lkm_flags = local ? DLM_LKF_LOCAL : 0;
ccd979bd
MF		 1171
1172 spin_lock_irqsave(&lockres->l_lock, flags);
1173 BUG_ON(lockres->l_flags & OCFS2_LOCK_ATTACHED);
1174 lockres_or_flags(lockres, OCFS2_LOCK_LOCAL);
1175 spin_unlock_irqrestore(&lockres->l_lock, flags);
1176
24c19ef4 1177 return ocfs2_lock_create(osb, lockres, level, lkm_flags);
ccd979bd
MF		 1178}
1179
1180/* Grants us an EX lock on the data and metadata resources, skipping
1181 * the normal cluster directory lookup. Use this ONLY on newly created
1182 * inodes which other nodes can't possibly see, and which haven't been
1183 * hashed in the inode hash yet. This can give us a good performance
1184 * increase as it'll skip the network broadcast normally associated
1185 * with creating a new lock resource. */
1186int ocfs2_create_new_inode_locks(struct inode *inode)
1187{
1188 int ret;
d680efe9 1189 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
ccd979bd
MF		 1190
1191 BUG_ON(!inode);
1192 BUG_ON(!ocfs2_inode_is_new(inode));
1193
1194 mlog_entry_void();
1195
b0697053 1196 mlog(0, "Inode %llu\n", (unsigned long long)OCFS2_I(inode)->ip_blkno);
ccd979bd
MF		 1197
1198 /* NOTE: That we don't increment any of the holder counts, nor
1199 * do we add anything to a journal handle. Since this is
1200 * supposed to be a new inode which the cluster doesn't know
1201 * about yet, there is no need to. As far as the LVB handling
1202 * is concerned, this is basically like acquiring an EX lock
1203 * on a resource which has an invalid one -- we'll set it
1204 * valid when we release the EX. */
1205
24c19ef4 1206 ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_rw_lockres, 1, 1);
ccd979bd
MF		 1207 if (ret) {
1208 mlog_errno(ret);
1209 goto bail;
1210 }
1211
24c19ef4 1212 /*
bd3e7610 1213 * We don't want to use DLM_LKF_LOCAL on a meta data lock as they
24c19ef4
MF		 1214 * don't use a generation in their lock names.
1215 */
e63aecb6 1216 ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_inode_lockres, 1, 0);
ccd979bd
MF		 1217 if (ret) {
1218 mlog_errno(ret);
1219 goto bail;
1220 }
1221
50008630
TY		 1222 ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_open_lockres, 0, 0);
1223 if (ret) {
1224 mlog_errno(ret);
1225 goto bail;
1226 }
1227
ccd979bd
MF		 1228bail:
1229 mlog_exit(ret);
1230 return ret;
1231}
1232
1233int ocfs2_rw_lock(struct inode *inode, int write)
1234{
1235 int status, level;
1236 struct ocfs2_lock_res *lockres;
c271c5c2 1237 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
ccd979bd
MF		 1238
1239 BUG_ON(!inode);
1240
1241 mlog_entry_void();
1242
b0697053
MF		 1243 mlog(0, "inode %llu take %s RW lock\n",
1244 (unsigned long long)OCFS2_I(inode)->ip_blkno,
ccd979bd
MF		 1245 write ? "EXMODE" : "PRMODE");
1246
c271c5c2
SM		 1247 if (ocfs2_mount_local(osb))
1248 return 0;
1249
ccd979bd
MF		 1250 lockres = &OCFS2_I(inode)->ip_rw_lockres;
1251
bd3e7610 1252 level = write ? DLM_LOCK_EX : DLM_LOCK_PR;
ccd979bd
MF		 1253
1254 status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres, level, 0,
1255 0);
1256 if (status < 0)
1257 mlog_errno(status);
1258
1259 mlog_exit(status);
1260 return status;
1261}
1262
1263void ocfs2_rw_unlock(struct inode *inode, int write)
1264{
bd3e7610 1265 int level = write ? DLM_LOCK_EX : DLM_LOCK_PR;
ccd979bd 1266 struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_rw_lockres;
c271c5c2 1267 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
ccd979bd
MF		 1268
1269 mlog_entry_void();
1270
b0697053
MF		 1271 mlog(0, "inode %llu drop %s RW lock\n",
1272 (unsigned long long)OCFS2_I(inode)->ip_blkno,
ccd979bd
MF		 1273 write ? "EXMODE" : "PRMODE");
1274
c271c5c2
SM		 1275 if (!ocfs2_mount_local(osb))
1276 ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level);
ccd979bd
MF		 1277
1278 mlog_exit_void();
1279}
1280
50008630
TY		 1281/*
1282 * ocfs2_open_lock always get PR mode lock.
1283 */
1284int ocfs2_open_lock(struct inode *inode)
1285{
1286 int status = 0;
1287 struct ocfs2_lock_res *lockres;
1288 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1289
1290 BUG_ON(!inode);
1291
1292 mlog_entry_void();
1293
1294 mlog(0, "inode %llu take PRMODE open lock\n",
1295 (unsigned long long)OCFS2_I(inode)->ip_blkno);
1296
1297 if (ocfs2_mount_local(osb))
1298 goto out;
1299
1300 lockres = &OCFS2_I(inode)->ip_open_lockres;
1301
1302 status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres,
bd3e7610 1303 DLM_LOCK_PR, 0, 0);
50008630
TY		 1304 if (status < 0)
1305 mlog_errno(status);
1306
1307out:
1308 mlog_exit(status);
1309 return status;
1310}
1311
1312int ocfs2_try_open_lock(struct inode *inode, int write)
1313{
1314 int status = 0, level;
1315 struct ocfs2_lock_res *lockres;
1316 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1317
1318 BUG_ON(!inode);
1319
1320 mlog_entry_void();
1321
1322 mlog(0, "inode %llu try to take %s open lock\n",
1323 (unsigned long long)OCFS2_I(inode)->ip_blkno,
1324 write ? "EXMODE" : "PRMODE");
1325
1326 if (ocfs2_mount_local(osb))
1327 goto out;
1328
1329 lockres = &OCFS2_I(inode)->ip_open_lockres;
1330
bd3e7610 1331 level = write ? DLM_LOCK_EX : DLM_LOCK_PR;
50008630
TY		 1332
1333 /*
1334 * The file system may already holding a PRMODE/EXMODE open lock.
bd3e7610 1335 * Since we pass DLM_LKF_NOQUEUE, the request won't block waiting on
50008630
TY		 1336 * other nodes and the -EAGAIN will indicate to the caller that
1337 * this inode is still in use.
1338 */
1339 status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres,
bd3e7610 1340 level, DLM_LKF_NOQUEUE, 0);
50008630
TY		 1341
1342out:
1343 mlog_exit(status);
1344 return status;
1345}
1346
1347/*
1348 * ocfs2_open_unlock unlock PR and EX mode open locks.
1349 */
1350void ocfs2_open_unlock(struct inode *inode)
1351{
1352 struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_open_lockres;
1353 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1354
1355 mlog_entry_void();
1356
1357 mlog(0, "inode %llu drop open lock\n",
1358 (unsigned long long)OCFS2_I(inode)->ip_blkno);
1359
1360 if (ocfs2_mount_local(osb))
1361 goto out;
1362
1363 if(lockres->l_ro_holders)
1364 ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres,
bd3e7610 1365 DLM_LOCK_PR);
50008630
TY		 1366 if(lockres->l_ex_holders)
1367 ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres,
bd3e7610 1368 DLM_LOCK_EX);
50008630
TY		 1369
1370out:
1371 mlog_exit_void();
1372}
1373
cf8e06f1
MF		 1374static int ocfs2_flock_handle_signal(struct ocfs2_lock_res *lockres,
1375 int level)
1376{
1377 int ret;
1378 struct ocfs2_super *osb = ocfs2_get_lockres_osb(lockres);
1379 unsigned long flags;
1380 struct ocfs2_mask_waiter mw;
1381
1382 ocfs2_init_mask_waiter(&mw);
1383
1384retry_cancel:
1385 spin_lock_irqsave(&lockres->l_lock, flags);
1386 if (lockres->l_flags & OCFS2_LOCK_BUSY) {
1387 ret = ocfs2_prepare_cancel_convert(osb, lockres);
1388 if (ret) {
1389 spin_unlock_irqrestore(&lockres->l_lock, flags);
1390 ret = ocfs2_cancel_convert(osb, lockres);
1391 if (ret < 0) {
1392 mlog_errno(ret);
1393 goto out;
1394 }
1395 goto retry_cancel;
1396 }
1397 lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0);
1398 spin_unlock_irqrestore(&lockres->l_lock, flags);
1399
1400 ocfs2_wait_for_mask(&mw);
1401 goto retry_cancel;
1402 }
1403
1404 ret = -ERESTARTSYS;
1405 /*
1406 * We may still have gotten the lock, in which case there's no
1407 * point to restarting the syscall.
1408 */
1409 if (lockres->l_level == level)
1410 ret = 0;
1411
1412 mlog(0, "Cancel returning %d. flags: 0x%lx, level: %d, act: %d\n", ret,
1413 lockres->l_flags, lockres->l_level, lockres->l_action);
1414
1415 spin_unlock_irqrestore(&lockres->l_lock, flags);
1416
1417out:
1418 return ret;
1419}
1420
1421/*
1422 * ocfs2_file_lock() and ocfs2_file_unlock() map to a single pair of
1423 * flock() calls. The locking approach this requires is sufficiently
1424 * different from all other cluster lock types that we implement a
1425 * seperate path to the "low-level" dlm calls. In particular:
1426 *
1427 * - No optimization of lock levels is done - we take at exactly
1428 * what's been requested.
1429 *
1430 * - No lock caching is employed. We immediately downconvert to
1431 * no-lock at unlock time. This also means flock locks never go on
1432 * the blocking list).
1433 *
1434 * - Since userspace can trivially deadlock itself with flock, we make
1435 * sure to allow cancellation of a misbehaving applications flock()
1436 * request.
1437 *
1438 * - Access to any flock lockres doesn't require concurrency, so we
1439 * can simplify the code by requiring the caller to guarantee
1440 * serialization of dlmglue flock calls.
1441 */
1442int ocfs2_file_lock(struct file *file, int ex, int trylock)
1443{
1444 int ret, level = ex ? LKM_EXMODE : LKM_PRMODE;
1445 unsigned int lkm_flags = trylock ? LKM_NOQUEUE : 0;
1446 unsigned long flags;
1447 struct ocfs2_file_private *fp = file->private_data;
1448 struct ocfs2_lock_res *lockres = &fp->fp_flock;
1449 struct ocfs2_super *osb = OCFS2_SB(file->f_mapping->host->i_sb);
1450 struct ocfs2_mask_waiter mw;
1451
1452 ocfs2_init_mask_waiter(&mw);
1453
1454 if ((lockres->l_flags & OCFS2_LOCK_BUSY) ||
bd3e7610 1455 (lockres->l_level > DLM_LOCK_NL)) {
cf8e06f1
MF		 1456 mlog(ML_ERROR,
1457 "File lock \"%s\" has busy or locked state: flags: 0x%lx, "
1458 "level: %u\n", lockres->l_name, lockres->l_flags,
1459 lockres->l_level);
1460 return -EINVAL;
1461 }
1462
1463 spin_lock_irqsave(&lockres->l_lock, flags);
1464 if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) {
1465 lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0);
1466 spin_unlock_irqrestore(&lockres->l_lock, flags);
1467
1468 /*
1469 * Get the lock at NLMODE to start - that way we
1470 * can cancel the upconvert request if need be.
1471 */
1472 ret = ocfs2_lock_create(osb, lockres, LKM_NLMODE, 0);
1473 if (ret < 0) {
1474 mlog_errno(ret);
1475 goto out;
1476 }
1477
1478 ret = ocfs2_wait_for_mask(&mw);
1479 if (ret) {
1480 mlog_errno(ret);
1481 goto out;
1482 }
1483 spin_lock_irqsave(&lockres->l_lock, flags);
1484 }
1485
1486 lockres->l_action = OCFS2_AST_CONVERT;
1487 lkm_flags |= LKM_CONVERT;
1488 lockres->l_requested = level;
1489 lockres_or_flags(lockres, OCFS2_LOCK_BUSY);
1490
1491 lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0);
1492 spin_unlock_irqrestore(&lockres->l_lock, flags);
1493
24ef1815
JB		 1494 ret = ocfs2_dlm_lock(osb->dlm, level, &lockres->l_lksb, lkm_flags,
1495 lockres->l_name, OCFS2_LOCK_ID_MAX_LEN - 1,
1496 lockres);
7431cd7e
JB		 1497 if (ret) {
1498 if (!trylock || (ret != -EAGAIN)) {
24ef1815 1499 ocfs2_log_dlm_error("ocfs2_dlm_lock", ret, lockres);
cf8e06f1
MF		 1500 ret = -EINVAL;
1501 }
1502
1503 ocfs2_recover_from_dlm_error(lockres, 1);
1504 lockres_remove_mask_waiter(lockres, &mw);
1505 goto out;
1506 }
1507
1508 ret = ocfs2_wait_for_mask_interruptible(&mw, lockres);
1509 if (ret == -ERESTARTSYS) {
1510 /*
1511 * Userspace can cause deadlock itself with
1512 * flock(). Current behavior locally is to allow the
1513 * deadlock, but abort the system call if a signal is
1514 * received. We follow this example, otherwise a
1515 * poorly written program could sit in kernel until
1516 * reboot.
1517 *
1518 * Handling this is a bit more complicated for Ocfs2
1519 * though. We can't exit this function with an
1520 * outstanding lock request, so a cancel convert is
1521 * required. We intentionally overwrite 'ret' - if the
1522 * cancel fails and the lock was granted, it's easier
1523 * to just bubble sucess back up to the user.
1524 */
1525 ret = ocfs2_flock_handle_signal(lockres, level);
1526 }
1527
1528out:
1529
1530 mlog(0, "Lock: \"%s\" ex: %d, trylock: %d, returns: %d\n",
1531 lockres->l_name, ex, trylock, ret);
1532 return ret;
1533}
1534
1535void ocfs2_file_unlock(struct file *file)
1536{
1537 int ret;
1538 unsigned long flags;
1539 struct ocfs2_file_private *fp = file->private_data;
1540 struct ocfs2_lock_res *lockres = &fp->fp_flock;
1541 struct ocfs2_super *osb = OCFS2_SB(file->f_mapping->host->i_sb);
1542 struct ocfs2_mask_waiter mw;
1543
1544 ocfs2_init_mask_waiter(&mw);
1545
1546 if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED))
1547 return;
1548
1549 if (lockres->l_level == LKM_NLMODE)
1550 return;
1551
1552 mlog(0, "Unlock: \"%s\" flags: 0x%lx, level: %d, act: %d\n",
1553 lockres->l_name, lockres->l_flags, lockres->l_level,
1554 lockres->l_action);
1555
1556 spin_lock_irqsave(&lockres->l_lock, flags);
1557 /*
1558 * Fake a blocking ast for the downconvert code.
1559 */
1560 lockres_or_flags(lockres, OCFS2_LOCK_BLOCKED);
bd3e7610 1561 lockres->l_blocking = DLM_LOCK_EX;
cf8e06f1
MF		 1562
1563 ocfs2_prepare_downconvert(lockres, LKM_NLMODE);
1564 lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0);
1565 spin_unlock_irqrestore(&lockres->l_lock, flags);
1566
1567 ret = ocfs2_downconvert_lock(osb, lockres, LKM_NLMODE, 0);
1568 if (ret) {
1569 mlog_errno(ret);
1570 return;
1571 }
1572
1573 ret = ocfs2_wait_for_mask(&mw);
1574 if (ret)
1575 mlog_errno(ret);
1576}
1577
34d024f8
MF		 1578static void ocfs2_downconvert_on_unlock(struct ocfs2_super *osb,
1579 struct ocfs2_lock_res *lockres)
ccd979bd
MF		 1580{
1581 int kick = 0;
1582
1583 mlog_entry_void();
1584
1585 /* If we know that another node is waiting on our lock, kick
34d024f8 1586 * the downconvert thread * pre-emptively when we reach a release
ccd979bd
MF		 1587 * condition. */
1588 if (lockres->l_flags & OCFS2_LOCK_BLOCKED) {
1589 switch(lockres->l_blocking) {
bd3e7610 1590 case DLM_LOCK_EX:
ccd979bd
MF		 1591 if (!lockres->l_ex_holders && !lockres->l_ro_holders)
1592 kick = 1;
1593 break;
bd3e7610 1594 case DLM_LOCK_PR:
ccd979bd
MF		 1595 if (!lockres->l_ex_holders)
1596 kick = 1;
1597 break;
1598 default:
1599 BUG();
1600 }
1601 }
1602
1603 if (kick)
34d024f8 1604 ocfs2_wake_downconvert_thread(osb);
ccd979bd
MF		 1605
1606 mlog_exit_void();
1607}
1608
ccd979bd
MF		 1609#define OCFS2_SEC_BITS 34
1610#define OCFS2_SEC_SHIFT (64 - 34)
1611#define OCFS2_NSEC_MASK ((1ULL << OCFS2_SEC_SHIFT) - 1)
1612
1613/* LVB only has room for 64 bits of time here so we pack it for
1614 * now. */
1615static u64 ocfs2_pack_timespec(struct timespec *spec)
1616{
1617 u64 res;
1618 u64 sec = spec->tv_sec;
1619 u32 nsec = spec->tv_nsec;
1620
1621 res = (sec << OCFS2_SEC_SHIFT) | (nsec & OCFS2_NSEC_MASK);
1622
1623 return res;
1624}
1625
1626/* Call this with the lockres locked. I am reasonably sure we don't
1627 * need ip_lock in this function as anyone who would be changing those
e63aecb6 1628 * values is supposed to be blocked in ocfs2_inode_lock right now. */
ccd979bd
MF		 1629static void __ocfs2_stuff_meta_lvb(struct inode *inode)
1630{
1631 struct ocfs2_inode_info *oi = OCFS2_I(inode);
e63aecb6 1632 struct ocfs2_lock_res *lockres = &oi->ip_inode_lockres;
ccd979bd
MF		 1633 struct ocfs2_meta_lvb *lvb;
1634
1635 mlog_entry_void();
1636
1637 lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb;
1638
24c19ef4
MF		 1639 /*
1640 * Invalidate the LVB of a deleted inode - this way other
1641 * nodes are forced to go to disk and discover the new inode
1642 * status.
1643 */
1644 if (oi->ip_flags & OCFS2_INODE_DELETED) {
1645 lvb->lvb_version = 0;
1646 goto out;
1647 }
1648
4d3b83f7 1649 lvb->lvb_version = OCFS2_LVB_VERSION;
ccd979bd
MF		 1650 lvb->lvb_isize = cpu_to_be64(i_size_read(inode));
1651 lvb->lvb_iclusters = cpu_to_be32(oi->ip_clusters);
1652 lvb->lvb_iuid = cpu_to_be32(inode->i_uid);
1653 lvb->lvb_igid = cpu_to_be32(inode->i_gid);
1654 lvb->lvb_imode = cpu_to_be16(inode->i_mode);
1655 lvb->lvb_inlink = cpu_to_be16(inode->i_nlink);
1656 lvb->lvb_iatime_packed =
1657 cpu_to_be64(ocfs2_pack_timespec(&inode->i_atime));
1658 lvb->lvb_ictime_packed =
1659 cpu_to_be64(ocfs2_pack_timespec(&inode->i_ctime));
1660 lvb->lvb_imtime_packed =
1661 cpu_to_be64(ocfs2_pack_timespec(&inode->i_mtime));
ca4d147e 1662 lvb->lvb_iattr = cpu_to_be32(oi->ip_attr);
15b1e36b 1663 lvb->lvb_idynfeatures = cpu_to_be16(oi->ip_dyn_features);
f9e2d82e 1664 lvb->lvb_igeneration = cpu_to_be32(inode->i_generation);
ccd979bd 1665
24c19ef4 1666out:
ccd979bd
MF		 1667 mlog_meta_lvb(0, lockres);
1668
1669 mlog_exit_void();
1670}
1671
1672static void ocfs2_unpack_timespec(struct timespec *spec,
1673 u64 packed_time)
1674{
1675 spec->tv_sec = packed_time >> OCFS2_SEC_SHIFT;
1676 spec->tv_nsec = packed_time & OCFS2_NSEC_MASK;
1677}
1678
1679static void ocfs2_refresh_inode_from_lvb(struct inode *inode)
1680{
1681 struct ocfs2_inode_info *oi = OCFS2_I(inode);
e63aecb6 1682 struct ocfs2_lock_res *lockres = &oi->ip_inode_lockres;
ccd979bd
MF		 1683 struct ocfs2_meta_lvb *lvb;
1684
1685 mlog_entry_void();
1686
1687 mlog_meta_lvb(0, lockres);
1688
1689 lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb;
1690
1691 /* We're safe here without the lockres lock... */
1692 spin_lock(&oi->ip_lock);
1693 oi->ip_clusters = be32_to_cpu(lvb->lvb_iclusters);
1694 i_size_write(inode, be64_to_cpu(lvb->lvb_isize));
1695
ca4d147e 1696 oi->ip_attr = be32_to_cpu(lvb->lvb_iattr);
15b1e36b 1697 oi->ip_dyn_features = be16_to_cpu(lvb->lvb_idynfeatures);
ca4d147e
HP		 1698 ocfs2_set_inode_flags(inode);
1699
ccd979bd
MF		 1700 /* fast-symlinks are a special case */
1701 if (S_ISLNK(inode->i_mode) && !oi->ip_clusters)
1702 inode->i_blocks = 0;
1703 else
8110b073 1704 inode->i_blocks = ocfs2_inode_sector_count(inode);
ccd979bd
MF		 1705
1706 inode->i_uid = be32_to_cpu(lvb->lvb_iuid);
1707 inode->i_gid = be32_to_cpu(lvb->lvb_igid);
1708 inode->i_mode = be16_to_cpu(lvb->lvb_imode);
1709 inode->i_nlink = be16_to_cpu(lvb->lvb_inlink);
1710 ocfs2_unpack_timespec(&inode->i_atime,
1711 be64_to_cpu(lvb->lvb_iatime_packed));
1712 ocfs2_unpack_timespec(&inode->i_mtime,
1713 be64_to_cpu(lvb->lvb_imtime_packed));
1714 ocfs2_unpack_timespec(&inode->i_ctime,
1715 be64_to_cpu(lvb->lvb_ictime_packed));
1716 spin_unlock(&oi->ip_lock);
1717
1718 mlog_exit_void();
1719}
1720
f9e2d82e
MF		 1721static inline int ocfs2_meta_lvb_is_trustable(struct inode *inode,
1722 struct ocfs2_lock_res *lockres)
ccd979bd
MF		 1723{
1724 struct ocfs2_meta_lvb *lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb;
1725
f9e2d82e
MF		 1726 if (lvb->lvb_version == OCFS2_LVB_VERSION
1727 && be32_to_cpu(lvb->lvb_igeneration) == inode->i_generation)
ccd979bd
MF		 1728 return 1;
1729 return 0;
1730}
1731
1732/* Determine whether a lock resource needs to be refreshed, and
1733 * arbitrate who gets to refresh it.
1734 *
1735 * 0 means no refresh needed.
1736 *
1737 * > 0 means you need to refresh this and you MUST call
1738 * ocfs2_complete_lock_res_refresh afterwards. */
1739static int ocfs2_should_refresh_lock_res(struct ocfs2_lock_res *lockres)
1740{
1741 unsigned long flags;
1742 int status = 0;
1743
1744 mlog_entry_void();
1745
1746refresh_check:
1747 spin_lock_irqsave(&lockres->l_lock, flags);
1748 if (!(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) {
1749 spin_unlock_irqrestore(&lockres->l_lock, flags);
1750 goto bail;
1751 }
1752
1753 if (lockres->l_flags & OCFS2_LOCK_REFRESHING) {
1754 spin_unlock_irqrestore(&lockres->l_lock, flags);
1755
1756 ocfs2_wait_on_refreshing_lock(lockres);
1757 goto refresh_check;
1758 }
1759
1760 /* Ok, I'll be the one to refresh this lock. */
1761 lockres_or_flags(lockres, OCFS2_LOCK_REFRESHING);
1762 spin_unlock_irqrestore(&lockres->l_lock, flags);
1763
1764 status = 1;
1765bail:
1766 mlog_exit(status);
1767 return status;
1768}
1769
1770/* If status is non zero, I'll mark it as not being in refresh
1771 * anymroe, but i won't clear the needs refresh flag. */
1772static inline void ocfs2_complete_lock_res_refresh(struct ocfs2_lock_res *lockres,
1773 int status)
1774{
1775 unsigned long flags;
1776 mlog_entry_void();
1777
1778 spin_lock_irqsave(&lockres->l_lock, flags);
1779 lockres_clear_flags(lockres, OCFS2_LOCK_REFRESHING);
1780 if (!status)
1781 lockres_clear_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH);
1782 spin_unlock_irqrestore(&lockres->l_lock, flags);
1783
1784 wake_up(&lockres->l_event);
1785
1786 mlog_exit_void();
1787}
1788
1789/* may or may not return a bh if it went to disk. */
e63aecb6 1790static int ocfs2_inode_lock_update(struct inode *inode,
ccd979bd
MF		 1791 struct buffer_head **bh)
1792{
1793 int status = 0;
1794 struct ocfs2_inode_info *oi = OCFS2_I(inode);
e63aecb6 1795 struct ocfs2_lock_res *lockres = &oi->ip_inode_lockres;
ccd979bd 1796 struct ocfs2_dinode *fe;
c271c5c2 1797 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
ccd979bd
MF		 1798
1799 mlog_entry_void();
1800
be9e986b
MF		 1801 if (ocfs2_mount_local(osb))
1802 goto bail;
1803
ccd979bd
MF		 1804 spin_lock(&oi->ip_lock);
1805 if (oi->ip_flags & OCFS2_INODE_DELETED) {
b0697053 1806 mlog(0, "Orphaned inode %llu was deleted while we "
ccd979bd 1807 "were waiting on a lock. ip_flags = 0x%x\n",
b0697053 1808 (unsigned long long)oi->ip_blkno, oi->ip_flags);
ccd979bd
MF		 1809 spin_unlock(&oi->ip_lock);
1810 status = -ENOENT;
1811 goto bail;
1812 }
1813 spin_unlock(&oi->ip_lock);
1814
be9e986b
MF		 1815 if (!ocfs2_should_refresh_lock_res(lockres))
1816 goto bail;
ccd979bd
MF		 1817
1818 /* This will discard any caching information we might have had
1819 * for the inode metadata. */
1820 ocfs2_metadata_cache_purge(inode);
1821
83418978
MF		 1822 ocfs2_extent_map_trunc(inode, 0);
1823
be9e986b 1824 if (ocfs2_meta_lvb_is_trustable(inode, lockres)) {
b0697053
MF		 1825 mlog(0, "Trusting LVB on inode %llu\n",
1826 (unsigned long long)oi->ip_blkno);
ccd979bd
MF		 1827 ocfs2_refresh_inode_from_lvb(inode);
1828 } else {
1829 /* Boo, we have to go to disk. */
1830 /* read bh, cast, ocfs2_refresh_inode */
1831 status = ocfs2_read_block(OCFS2_SB(inode->i_sb), oi->ip_blkno,
1832 bh, OCFS2_BH_CACHED, inode);
1833 if (status < 0) {
1834 mlog_errno(status);
1835 goto bail_refresh;
1836 }
1837 fe = (struct ocfs2_dinode *) (*bh)->b_data;
1838
1839 /* This is a good chance to make sure we're not
1840 * locking an invalid object.
1841 *
1842 * We bug on a stale inode here because we checked
1843 * above whether it was wiped from disk. The wiping
1844 * node provides a guarantee that we receive that
1845 * message and can mark the inode before dropping any
1846 * locks associated with it. */
1847 if (!OCFS2_IS_VALID_DINODE(fe)) {
1848 OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe);
1849 status = -EIO;
1850 goto bail_refresh;
1851 }
1852 mlog_bug_on_msg(inode->i_generation !=
1853 le32_to_cpu(fe->i_generation),
b0697053 1854 "Invalid dinode %llu disk generation: %u "
ccd979bd 1855 "inode->i_generation: %u\n",
b0697053
MF		 1856 (unsigned long long)oi->ip_blkno,
1857 le32_to_cpu(fe->i_generation),
ccd979bd
MF		 1858 inode->i_generation);
1859 mlog_bug_on_msg(le64_to_cpu(fe->i_dtime) ||
1860 !(fe->i_flags & cpu_to_le32(OCFS2_VALID_FL)),
b0697053
MF		 1861 "Stale dinode %llu dtime: %llu flags: 0x%x\n",
1862 (unsigned long long)oi->ip_blkno,
1863 (unsigned long long)le64_to_cpu(fe->i_dtime),
ccd979bd
MF		 1864 le32_to_cpu(fe->i_flags));
1865
1866 ocfs2_refresh_inode(inode, fe);
1867 }
1868
1869 status = 0;
1870bail_refresh:
be9e986b 1871 ocfs2_complete_lock_res_refresh(lockres, status);
ccd979bd
MF		 1872bail:
1873 mlog_exit(status);
1874 return status;
1875}
1876
1877static int ocfs2_assign_bh(struct inode *inode,
1878 struct buffer_head **ret_bh,
1879 struct buffer_head *passed_bh)
1880{
1881 int status;
1882
1883 if (passed_bh) {
1884 /* Ok, the update went to disk for us, use the
1885 * returned bh. */
1886 *ret_bh = passed_bh;
1887 get_bh(*ret_bh);
1888
1889 return 0;
1890 }
1891
1892 status = ocfs2_read_block(OCFS2_SB(inode->i_sb),
1893 OCFS2_I(inode)->ip_blkno,
1894 ret_bh,
1895 OCFS2_BH_CACHED,
1896 inode);
1897 if (status < 0)
1898 mlog_errno(status);
1899
1900 return status;
1901}
1902
1903/*
1904 * returns < 0 error if the callback will never be called, otherwise
1905 * the result of the lock will be communicated via the callback.
1906 */
e63aecb6 1907int ocfs2_inode_lock_full(struct inode *inode,
ccd979bd
MF		 1908 struct buffer_head **ret_bh,
1909 int ex,
1910 int arg_flags)
1911{
bd3e7610
JB		 1912 int status, level, acquired;
1913 u32 dlm_flags;
c271c5c2 1914 struct ocfs2_lock_res *lockres = NULL;
ccd979bd
MF		 1915 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1916 struct buffer_head *local_bh = NULL;
1917
1918 BUG_ON(!inode);
1919
1920 mlog_entry_void();
1921
b0697053
MF		 1922 mlog(0, "inode %llu, take %s META lock\n",
1923 (unsigned long long)OCFS2_I(inode)->ip_blkno,
ccd979bd
MF		 1924 ex ? "EXMODE" : "PRMODE");
1925
1926 status = 0;
1927 acquired = 0;
1928 /* We'll allow faking a readonly metadata lock for
1929 * rodevices. */
1930 if (ocfs2_is_hard_readonly(osb)) {
1931 if (ex)
1932 status = -EROFS;
1933 goto bail;
1934 }
1935
c271c5c2
SM		 1936 if (ocfs2_mount_local(osb))
1937 goto local;
1938
ccd979bd 1939 if (!(arg_flags & OCFS2_META_LOCK_RECOVERY))
553abd04 1940 ocfs2_wait_for_recovery(osb);
ccd979bd 1941
e63aecb6 1942 lockres = &OCFS2_I(inode)->ip_inode_lockres;
bd3e7610 1943 level = ex ? DLM_LOCK_EX : DLM_LOCK_PR;
ccd979bd
MF		 1944 dlm_flags = 0;
1945 if (arg_flags & OCFS2_META_LOCK_NOQUEUE)
bd3e7610 1946 dlm_flags |= DLM_LKF_NOQUEUE;
ccd979bd
MF		 1947
1948 status = ocfs2_cluster_lock(osb, lockres, level, dlm_flags, arg_flags);
1949 if (status < 0) {
1950 if (status != -EAGAIN && status != -EIOCBRETRY)
1951 mlog_errno(status);
1952 goto bail;
1953 }
1954
1955 /* Notify the error cleanup path to drop the cluster lock. */
1956 acquired = 1;
1957
1958 /* We wait twice because a node may have died while we were in
1959 * the lower dlm layers. The second time though, we've
1960 * committed to owning this lock so we don't allow signals to
1961 * abort the operation. */
1962 if (!(arg_flags & OCFS2_META_LOCK_RECOVERY))
553abd04 1963 ocfs2_wait_for_recovery(osb);
ccd979bd 1964
c271c5c2 1965local:
24c19ef4
MF		 1966 /*
1967 * We only see this flag if we're being called from
1968 * ocfs2_read_locked_inode(). It means we're locking an inode
1969 * which hasn't been populated yet, so clear the refresh flag
1970 * and let the caller handle it.
1971 */
1972 if (inode->i_state & I_NEW) {
1973 status = 0;
c271c5c2
SM		 1974 if (lockres)
1975 ocfs2_complete_lock_res_refresh(lockres, 0);
24c19ef4
MF		 1976 goto bail;
1977 }
1978
ccd979bd 1979 /* This is fun. The caller may want a bh back, or it may
e63aecb6 1980 * not. ocfs2_inode_lock_update definitely wants one in, but
ccd979bd
MF		 1981 * may or may not read one, depending on what's in the
1982 * LVB. The result of all of this is that we've *only* gone to
1983 * disk if we have to, so the complexity is worthwhile. */
e63aecb6 1984 status = ocfs2_inode_lock_update(inode, &local_bh);
ccd979bd
MF		 1985 if (status < 0) {
1986 if (status != -ENOENT)
1987 mlog_errno(status);
1988 goto bail;
1989 }
1990
1991 if (ret_bh) {
1992 status = ocfs2_assign_bh(inode, ret_bh, local_bh);
1993 if (status < 0) {
1994 mlog_errno(status);
1995 goto bail;
1996 }
1997 }
1998
ccd979bd
MF		 1999bail:
2000 if (status < 0) {
2001 if (ret_bh && (*ret_bh)) {
2002 brelse(*ret_bh);
2003 *ret_bh = NULL;
2004 }
2005 if (acquired)
e63aecb6 2006 ocfs2_inode_unlock(inode, ex);
ccd979bd
MF		 2007 }
2008
2009 if (local_bh)
2010 brelse(local_bh);
2011
2012 mlog_exit(status);
2013 return status;
2014}
2015
2016/*
34d024f8
MF		 2017 * This is working around a lock inversion between tasks acquiring DLM
2018 * locks while holding a page lock and the downconvert thread which
2019 * blocks dlm lock acquiry while acquiring page locks.
ccd979bd
MF		 2020 *
2021 * ** These _with_page variantes are only intended to be called from aop
2022 * methods that hold page locks and return a very specific *positive* error
2023 * code that aop methods pass up to the VFS -- test for errors with != 0. **
2024 *
34d024f8
MF		 2025 * The DLM is called such that it returns -EAGAIN if it would have
2026 * blocked waiting for the downconvert thread. In that case we unlock
2027 * our page so the downconvert thread can make progress. Once we've
2028 * done this we have to return AOP_TRUNCATED_PAGE so the aop method
2029 * that called us can bubble that back up into the VFS who will then
2030 * immediately retry the aop call.
ccd979bd
MF		 2031 *
2032 * We do a blocking lock and immediate unlock before returning, though, so that
2033 * the lock has a great chance of being cached on this node by the time the VFS
2034 * calls back to retry the aop. This has a potential to livelock as nodes
2035 * ping locks back and forth, but that's a risk we're willing to take to avoid
2036 * the lock inversion simply.
2037 */
e63aecb6 2038int ocfs2_inode_lock_with_page(struct inode *inode,
ccd979bd
MF		 2039 struct buffer_head **ret_bh,
2040 int ex,
2041 struct page *page)
2042{
2043 int ret;
2044
e63aecb6 2045 ret = ocfs2_inode_lock_full(inode, ret_bh, ex, OCFS2_LOCK_NONBLOCK);
ccd979bd
MF		 2046 if (ret == -EAGAIN) {
2047 unlock_page(page);
e63aecb6
MF		 2048 if (ocfs2_inode_lock(inode, ret_bh, ex) == 0)
2049 ocfs2_inode_unlock(inode, ex);
ccd979bd
MF		 2050 ret = AOP_TRUNCATED_PAGE;
2051 }
2052
2053 return ret;
2054}
2055
e63aecb6 2056int ocfs2_inode_lock_atime(struct inode *inode,
7f1a37e3
TY		 2057 struct vfsmount *vfsmnt,
2058 int *level)
2059{
2060 int ret;
2061
2062 mlog_entry_void();
e63aecb6 2063 ret = ocfs2_inode_lock(inode, NULL, 0);
7f1a37e3
TY		 2064 if (ret < 0) {
2065 mlog_errno(ret);
2066 return ret;
2067 }
2068
2069 /*
2070 * If we should update atime, we will get EX lock,
2071 * otherwise we just get PR lock.
2072 */
2073 if (ocfs2_should_update_atime(inode, vfsmnt)) {
2074 struct buffer_head *bh = NULL;
2075
e63aecb6
MF		 2076 ocfs2_inode_unlock(inode, 0);
2077 ret = ocfs2_inode_lock(inode, &bh, 1);
7f1a37e3
TY		 2078 if (ret < 0) {
2079 mlog_errno(ret);
2080 return ret;
2081 }
2082 *level = 1;
2083 if (ocfs2_should_update_atime(inode, vfsmnt))
2084 ocfs2_update_inode_atime(inode, bh);
2085 if (bh)
2086 brelse(bh);
2087 } else
2088 *level = 0;
2089
2090 mlog_exit(ret);
2091 return ret;
2092}
2093
e63aecb6 2094void ocfs2_inode_unlock(struct inode *inode,
ccd979bd
MF		 2095 int ex)
2096{
bd3e7610 2097 int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR;
e63aecb6 2098 struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_inode_lockres;
c271c5c2 2099 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
ccd979bd
MF		 2100
2101 mlog_entry_void();
2102
b0697053
MF		 2103 mlog(0, "inode %llu drop %s META lock\n",
2104 (unsigned long long)OCFS2_I(inode)->ip_blkno,
ccd979bd
MF		 2105 ex ? "EXMODE" : "PRMODE");
2106
c271c5c2
SM		 2107 if (!ocfs2_is_hard_readonly(OCFS2_SB(inode->i_sb)) &&
2108 !ocfs2_mount_local(osb))
ccd979bd
MF		 2109 ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level);
2110
2111 mlog_exit_void();
2112}
2113
2114int ocfs2_super_lock(struct ocfs2_super *osb,
2115 int ex)
2116{
c271c5c2 2117 int status = 0;
bd3e7610 2118 int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR;
ccd979bd 2119 struct ocfs2_lock_res *lockres = &osb->osb_super_lockres;
ccd979bd
MF		 2120
2121 mlog_entry_void();
2122
2123 if (ocfs2_is_hard_readonly(osb))
2124 return -EROFS;
2125
c271c5c2
SM		 2126 if (ocfs2_mount_local(osb))
2127 goto bail;
2128
ccd979bd
MF		 2129 status = ocfs2_cluster_lock(osb, lockres, level, 0, 0);
2130 if (status < 0) {
2131 mlog_errno(status);
2132 goto bail;
2133 }
2134
2135 /* The super block lock path is really in the best position to
2136 * know when resources covered by the lock need to be
2137 * refreshed, so we do it here. Of course, making sense of
2138 * everything is up to the caller :) */
2139 status = ocfs2_should_refresh_lock_res(lockres);
2140 if (status < 0) {
2141 mlog_errno(status);
2142 goto bail;
2143 }
2144 if (status) {
8e8a4603 2145 status = ocfs2_refresh_slot_info(osb);
ccd979bd
MF		 2146
2147 ocfs2_complete_lock_res_refresh(lockres, status);
2148
2149 if (status < 0)
2150 mlog_errno(status);
2151 }
2152bail:
2153 mlog_exit(status);
2154 return status;
2155}
2156
2157void ocfs2_super_unlock(struct ocfs2_super *osb,
2158 int ex)
2159{
bd3e7610 2160 int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR;
ccd979bd
MF		 2161 struct ocfs2_lock_res *lockres = &osb->osb_super_lockres;
2162
c271c5c2
SM		 2163 if (!ocfs2_mount_local(osb))
2164 ocfs2_cluster_unlock(osb, lockres, level);
ccd979bd
MF		 2165}
2166
2167int ocfs2_rename_lock(struct ocfs2_super *osb)
2168{
2169 int status;
2170 struct ocfs2_lock_res *lockres = &osb->osb_rename_lockres;
2171
2172 if (ocfs2_is_hard_readonly(osb))
2173 return -EROFS;
2174
c271c5c2
SM		 2175 if (ocfs2_mount_local(osb))
2176 return 0;
2177
bd3e7610 2178 status = ocfs2_cluster_lock(osb, lockres, DLM_LOCK_EX, 0, 0);
ccd979bd
MF		 2179 if (status < 0)
2180 mlog_errno(status);
2181
2182 return status;
2183}
2184
2185void ocfs2_rename_unlock(struct ocfs2_super *osb)
2186{
2187 struct ocfs2_lock_res *lockres = &osb->osb_rename_lockres;
2188
c271c5c2 2189 if (!ocfs2_mount_local(osb))
bd3e7610 2190 ocfs2_cluster_unlock(osb, lockres, DLM_LOCK_EX);
ccd979bd
MF		 2191}
2192
d680efe9
MF		 2193int ocfs2_dentry_lock(struct dentry *dentry, int ex)
2194{
2195 int ret;
bd3e7610 2196 int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR;
d680efe9
MF		 2197 struct ocfs2_dentry_lock *dl = dentry->d_fsdata;
2198 struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
2199
2200 BUG_ON(!dl);
2201
2202 if (ocfs2_is_hard_readonly(osb))
2203 return -EROFS;
2204
c271c5c2
SM		 2205 if (ocfs2_mount_local(osb))
2206 return 0;
2207
d680efe9
MF		 2208 ret = ocfs2_cluster_lock(osb, &dl->dl_lockres, level, 0, 0);
2209 if (ret < 0)
2210 mlog_errno(ret);
2211
2212 return ret;
2213}
2214
2215void ocfs2_dentry_unlock(struct dentry *dentry, int ex)
2216{
bd3e7610 2217 int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR;
d680efe9
MF		 2218 struct ocfs2_dentry_lock *dl = dentry->d_fsdata;
2219 struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
2220
c271c5c2
SM		 2221 if (!ocfs2_mount_local(osb))
2222 ocfs2_cluster_unlock(osb, &dl->dl_lockres, level);
d680efe9
MF		 2223}
2224
ccd979bd
MF		 2225/* Reference counting of the dlm debug structure. We want this because
2226 * open references on the debug inodes can live on after a mount, so
2227 * we can't rely on the ocfs2_super to always exist. */
2228static void ocfs2_dlm_debug_free(struct kref *kref)
2229{
2230 struct ocfs2_dlm_debug *dlm_debug;
2231
2232 dlm_debug = container_of(kref, struct ocfs2_dlm_debug, d_refcnt);
2233
2234 kfree(dlm_debug);
2235}
2236
2237void ocfs2_put_dlm_debug(struct ocfs2_dlm_debug *dlm_debug)
2238{
2239 if (dlm_debug)
2240 kref_put(&dlm_debug->d_refcnt, ocfs2_dlm_debug_free);
2241}
2242
2243static void ocfs2_get_dlm_debug(struct ocfs2_dlm_debug *debug)
2244{
2245 kref_get(&debug->d_refcnt);
2246}
2247
2248struct ocfs2_dlm_debug *ocfs2_new_dlm_debug(void)
2249{
2250 struct ocfs2_dlm_debug *dlm_debug;
2251
2252 dlm_debug = kmalloc(sizeof(struct ocfs2_dlm_debug), GFP_KERNEL);
2253 if (!dlm_debug) {
2254 mlog_errno(-ENOMEM);
2255 goto out;
2256 }
2257
2258 kref_init(&dlm_debug->d_refcnt);
2259 INIT_LIST_HEAD(&dlm_debug->d_lockres_tracking);
2260 dlm_debug->d_locking_state = NULL;
2261out:
2262 return dlm_debug;
2263}
2264
2265/* Access to this is arbitrated for us via seq_file->sem. */
2266struct ocfs2_dlm_seq_priv {
2267 struct ocfs2_dlm_debug *p_dlm_debug;
2268 struct ocfs2_lock_res p_iter_res;
2269 struct ocfs2_lock_res p_tmp_res;
2270};
2271
2272static struct ocfs2_lock_res *ocfs2_dlm_next_res(struct ocfs2_lock_res *start,
2273 struct ocfs2_dlm_seq_priv *priv)
2274{
2275 struct ocfs2_lock_res *iter, *ret = NULL;
2276 struct ocfs2_dlm_debug *dlm_debug = priv->p_dlm_debug;
2277
2278 assert_spin_locked(&ocfs2_dlm_tracking_lock);
2279
2280 list_for_each_entry(iter, &start->l_debug_list, l_debug_list) {
2281 /* discover the head of the list */
2282 if (&iter->l_debug_list == &dlm_debug->d_lockres_tracking) {
2283 mlog(0, "End of list found, %p\n", ret);
2284 break;
2285 }
2286
2287 /* We track our "dummy" iteration lockres' by a NULL
2288 * l_ops field. */
2289 if (iter->l_ops != NULL) {
2290 ret = iter;
2291 break;
2292 }
2293 }
2294
2295 return ret;
2296}
2297
2298static void *ocfs2_dlm_seq_start(struct seq_file *m, loff_t *pos)
2299{
2300 struct ocfs2_dlm_seq_priv *priv = m->private;
2301 struct ocfs2_lock_res *iter;
2302
2303 spin_lock(&ocfs2_dlm_tracking_lock);
2304 iter = ocfs2_dlm_next_res(&priv->p_iter_res, priv);
2305 if (iter) {
2306 /* Since lockres' have the lifetime of their container
2307 * (which can be inodes, ocfs2_supers, etc) we want to
2308 * copy this out to a temporary lockres while still
2309 * under the spinlock. Obviously after this we can't
2310 * trust any pointers on the copy returned, but that's
2311 * ok as the information we want isn't typically held
2312 * in them. */
2313 priv->p_tmp_res = *iter;
2314 iter = &priv->p_tmp_res;
2315 }
2316 spin_unlock(&ocfs2_dlm_tracking_lock);
2317
2318 return iter;
2319}
2320
2321static void ocfs2_dlm_seq_stop(struct seq_file *m, void *v)
2322{
2323}
2324
2325static void *ocfs2_dlm_seq_next(struct seq_file *m, void *v, loff_t *pos)
2326{
2327 struct ocfs2_dlm_seq_priv *priv = m->private;
2328 struct ocfs2_lock_res *iter = v;
2329 struct ocfs2_lock_res *dummy = &priv->p_iter_res;
2330
2331 spin_lock(&ocfs2_dlm_tracking_lock);
2332 iter = ocfs2_dlm_next_res(iter, priv);
2333 list_del_init(&dummy->l_debug_list);
2334 if (iter) {
2335 list_add(&dummy->l_debug_list, &iter->l_debug_list);
2336 priv->p_tmp_res = *iter;
2337 iter = &priv->p_tmp_res;
2338 }
2339 spin_unlock(&ocfs2_dlm_tracking_lock);
2340
2341 return iter;
2342}
2343
2344/* So that debugfs.ocfs2 can determine which format is being used */
2345#define OCFS2_DLM_DEBUG_STR_VERSION 1
2346static int ocfs2_dlm_seq_show(struct seq_file *m, void *v)
2347{
2348 int i;
2349 char *lvb;
2350 struct ocfs2_lock_res *lockres = v;
2351
2352 if (!lockres)
2353 return -EINVAL;
2354
d680efe9
MF		 2355 seq_printf(m, "0x%x\t", OCFS2_DLM_DEBUG_STR_VERSION);
2356
2357 if (lockres->l_type == OCFS2_LOCK_TYPE_DENTRY)
2358 seq_printf(m, "%.*s%08x\t", OCFS2_DENTRY_LOCK_INO_START - 1,
2359 lockres->l_name,
2360 (unsigned int)ocfs2_get_dentry_lock_ino(lockres));
2361 else
2362 seq_printf(m, "%.*s\t", OCFS2_LOCK_ID_MAX_LEN, lockres->l_name);
2363
2364 seq_printf(m, "%d\t"
ccd979bd
MF		 2365 "0x%lx\t"
2366 "0x%x\t"
2367 "0x%x\t"
2368 "%u\t"
2369 "%u\t"
2370 "%d\t"
2371 "%d\t",
ccd979bd
MF		 2372 lockres->l_level,
2373 lockres->l_flags,
2374 lockres->l_action,
2375 lockres->l_unlock_action,
2376 lockres->l_ro_holders,
2377 lockres->l_ex_holders,
2378 lockres->l_requested,
2379 lockres->l_blocking);
2380
2381 /* Dump the raw LVB */
2382 lvb = lockres->l_lksb.lvb;
2383 for(i = 0; i < DLM_LVB_LEN; i++)
2384 seq_printf(m, "0x%x\t", lvb[i]);
2385
2386 /* End the line */
2387 seq_printf(m, "\n");
2388 return 0;
2389}
2390
90d99779 2391static const struct seq_operations ocfs2_dlm_seq_ops = {
ccd979bd
MF		 2392 .start = ocfs2_dlm_seq_start,
2393 .stop = ocfs2_dlm_seq_stop,
2394 .next = ocfs2_dlm_seq_next,
2395 .show = ocfs2_dlm_seq_show,
2396};
2397
2398static int ocfs2_dlm_debug_release(struct inode *inode, struct file *file)
2399{
2400 struct seq_file *seq = (struct seq_file *) file->private_data;
2401 struct ocfs2_dlm_seq_priv *priv = seq->private;
2402 struct ocfs2_lock_res *res = &priv->p_iter_res;
2403
2404 ocfs2_remove_lockres_tracking(res);
2405 ocfs2_put_dlm_debug(priv->p_dlm_debug);
2406 return seq_release_private(inode, file);
2407}
2408
2409static int ocfs2_dlm_debug_open(struct inode *inode, struct file *file)
2410{
2411 int ret;
2412 struct ocfs2_dlm_seq_priv *priv;
2413 struct seq_file *seq;
2414 struct ocfs2_super *osb;
2415
2416 priv = kzalloc(sizeof(struct ocfs2_dlm_seq_priv), GFP_KERNEL);
2417 if (!priv) {
2418 ret = -ENOMEM;
2419 mlog_errno(ret);
2420 goto out;
2421 }
8e18e294 2422 osb = inode->i_private;
ccd979bd
MF		 2423 ocfs2_get_dlm_debug(osb->osb_dlm_debug);
2424 priv->p_dlm_debug = osb->osb_dlm_debug;
2425 INIT_LIST_HEAD(&priv->p_iter_res.l_debug_list);
2426
2427 ret = seq_open(file, &ocfs2_dlm_seq_ops);
2428 if (ret) {
2429 kfree(priv);
2430 mlog_errno(ret);
2431 goto out;
2432 }
2433
2434 seq = (struct seq_file *) file->private_data;
2435 seq->private = priv;
2436
2437 ocfs2_add_lockres_tracking(&priv->p_iter_res,
2438 priv->p_dlm_debug);
2439
2440out:
2441 return ret;
2442}
2443
4b6f5d20 2444static const struct file_operations ocfs2_dlm_debug_fops = {
ccd979bd
MF		 2445 .open = ocfs2_dlm_debug_open,
2446 .release = ocfs2_dlm_debug_release,
2447 .read = seq_read,
2448 .llseek = seq_lseek,
2449};
2450
2451static int ocfs2_dlm_init_debug(struct ocfs2_super *osb)
2452{
2453 int ret = 0;
2454 struct ocfs2_dlm_debug *dlm_debug = osb->osb_dlm_debug;
2455
2456 dlm_debug->d_locking_state = debugfs_create_file("locking_state",
2457 S_IFREG|S_IRUSR,
2458 osb->osb_debug_root,
2459 osb,
2460 &ocfs2_dlm_debug_fops);
2461 if (!dlm_debug->d_locking_state) {
2462 ret = -EINVAL;
2463 mlog(ML_ERROR,
2464 "Unable to create locking state debugfs file.\n");
2465 goto out;
2466 }
2467
2468 ocfs2_get_dlm_debug(dlm_debug);
2469out:
2470 return ret;
2471}
2472
2473static void ocfs2_dlm_shutdown_debug(struct ocfs2_super *osb)
2474{
2475 struct ocfs2_dlm_debug *dlm_debug = osb->osb_dlm_debug;
2476
2477 if (dlm_debug) {
2478 debugfs_remove(dlm_debug->d_locking_state);
2479 ocfs2_put_dlm_debug(dlm_debug);
2480 }
2481}
2482
2483int ocfs2_dlm_init(struct ocfs2_super *osb)
2484{
c271c5c2 2485 int status = 0;
ccd979bd 2486 u32 dlm_key;
c271c5c2 2487 struct dlm_ctxt *dlm = NULL;
ccd979bd
MF		 2488
2489 mlog_entry_void();
2490
c271c5c2
SM		 2491 if (ocfs2_mount_local(osb))
2492 goto local;
2493
ccd979bd
MF		 2494 status = ocfs2_dlm_init_debug(osb);
2495 if (status < 0) {
2496 mlog_errno(status);
2497 goto bail;
2498 }
2499
34d024f8
MF		 2500 /* launch downconvert thread */
2501 osb->dc_task = kthread_run(ocfs2_downconvert_thread, osb, "ocfs2dc");
2502 if (IS_ERR(osb->dc_task)) {
2503 status = PTR_ERR(osb->dc_task);
2504 osb->dc_task = NULL;
ccd979bd
MF		 2505 mlog_errno(status);
2506 goto bail;
2507 }
2508
2509 /* used by the dlm code to make message headers unique, each
2510 * node in this domain must agree on this. */
2511 dlm_key = crc32_le(0, osb->uuid_str, strlen(osb->uuid_str));
2512
2513 /* for now, uuid == domain */
d24fbcda
JB		 2514 dlm = dlm_register_domain(osb->uuid_str, dlm_key,
2515 &osb->osb_locking_proto);
ccd979bd
MF		 2516 if (IS_ERR(dlm)) {
2517 status = PTR_ERR(dlm);
2518 mlog_errno(status);
2519 goto bail;
2520 }
2521
c271c5c2
SM		 2522 dlm_register_eviction_cb(dlm, &osb->osb_eviction_cb);
2523
2524local:
ccd979bd
MF		 2525 ocfs2_super_lock_res_init(&osb->osb_super_lockres, osb);
2526 ocfs2_rename_lock_res_init(&osb->osb_rename_lockres, osb);
2527
ccd979bd
MF		 2528 osb->dlm = dlm;
2529
2530 status = 0;
2531bail:
2532 if (status < 0) {
2533 ocfs2_dlm_shutdown_debug(osb);
34d024f8
MF		 2534 if (osb->dc_task)
2535 kthread_stop(osb->dc_task);
ccd979bd
MF		 2536 }
2537
2538 mlog_exit(status);
2539 return status;
2540}
2541
2542void ocfs2_dlm_shutdown(struct ocfs2_super *osb)
2543{
2544 mlog_entry_void();
2545
2546 dlm_unregister_eviction_cb(&osb->osb_eviction_cb);
2547
2548 ocfs2_drop_osb_locks(osb);
2549
34d024f8
MF		 2550 if (osb->dc_task) {
2551 kthread_stop(osb->dc_task);
2552 osb->dc_task = NULL;
ccd979bd
MF		 2553 }
2554
2555 ocfs2_lock_res_free(&osb->osb_super_lockres);
2556 ocfs2_lock_res_free(&osb->osb_rename_lockres);
2557
2558 dlm_unregister_domain(osb->dlm);
2559 osb->dlm = NULL;
2560
2561 ocfs2_dlm_shutdown_debug(osb);
2562
2563 mlog_exit_void();
2564}
2565
7431cd7e 2566static void ocfs2_unlock_ast(void *opaque, int error)
ccd979bd
MF		 2567{
2568 struct ocfs2_lock_res *lockres = opaque;
2569 unsigned long flags;
2570
2571 mlog_entry_void();
2572
2573 mlog(0, "UNLOCK AST called on lock %s, action = %d\n", lockres->l_name,
2574 lockres->l_unlock_action);
2575
2576 spin_lock_irqsave(&lockres->l_lock, flags);
2577 /* We tried to cancel a convert request, but it was already
2578 * granted. All we want to do here is clear our unlock
2579 * state. The wake_up call done at the bottom is redundant
2580 * (ocfs2_prepare_cancel_convert doesn't sleep on this) but doesn't
2581 * hurt anything anyway */
7431cd7e 2582 if (error == -DLM_ECANCEL &&
ccd979bd
MF		 2583 lockres->l_unlock_action == OCFS2_UNLOCK_CANCEL_CONVERT) {
2584 mlog(0, "Got cancelgrant for %s\n", lockres->l_name);
2585
2586 /* We don't clear the busy flag in this case as it
2587 * should have been cleared by the ast which the dlm
2588 * has called. */
2589 goto complete_unlock;
2590 }
2591
7431cd7e
JB		 2592 /* DLM_EUNLOCK is the success code for unlock */
2593 if (error != -DLM_EUNLOCK) {
2594 mlog(ML_ERROR, "Dlm passes error %d for lock %s, "
2595 "unlock_action %d\n", error, lockres->l_name,
ccd979bd
MF		 2596 lockres->l_unlock_action);
2597 spin_unlock_irqrestore(&lockres->l_lock, flags);
2598 return;
2599 }
2600
2601 switch(lockres->l_unlock_action) {
2602 case OCFS2_UNLOCK_CANCEL_CONVERT:
2603 mlog(0, "Cancel convert success for %s\n", lockres->l_name);
2604 lockres->l_action = OCFS2_AST_INVALID;
2605 break;
2606 case OCFS2_UNLOCK_DROP_LOCK:
bd3e7610 2607 lockres->l_level = DLM_LOCK_IV;
ccd979bd
MF		 2608 break;
2609 default:
2610 BUG();
2611 }
2612
2613 lockres_clear_flags(lockres, OCFS2_LOCK_BUSY);
2614complete_unlock:
2615 lockres->l_unlock_action = OCFS2_UNLOCK_INVALID;
2616 spin_unlock_irqrestore(&lockres->l_lock, flags);
2617
2618 wake_up(&lockres->l_event);
2619
2620 mlog_exit_void();
2621}
2622
ccd979bd 2623static int ocfs2_drop_lock(struct ocfs2_super *osb,
0d5dc6c2 2624 struct ocfs2_lock_res *lockres)
ccd979bd 2625{
7431cd7e 2626 int ret;
ccd979bd 2627 unsigned long flags;
bd3e7610 2628 u32 lkm_flags = 0;
ccd979bd
MF		 2629
2630 /* We didn't get anywhere near actually using this lockres. */
2631 if (!(lockres->l_flags & OCFS2_LOCK_INITIALIZED))
2632 goto out;
2633
b80fc012 2634 if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB)
bd3e7610 2635 lkm_flags |= DLM_LKF_VALBLK;
b80fc012 2636
ccd979bd
MF		 2637 spin_lock_irqsave(&lockres->l_lock, flags);
2638
2639 mlog_bug_on_msg(!(lockres->l_flags & OCFS2_LOCK_FREEING),
2640 "lockres %s, flags 0x%lx\n",
2641 lockres->l_name, lockres->l_flags);
2642
2643 while (lockres->l_flags & OCFS2_LOCK_BUSY) {
2644 mlog(0, "waiting on busy lock \"%s\": flags = %lx, action = "
2645 "%u, unlock_action = %u\n",
2646 lockres->l_name, lockres->l_flags, lockres->l_action,
2647 lockres->l_unlock_action);
2648
2649 spin_unlock_irqrestore(&lockres->l_lock, flags);
2650
2651 /* XXX: Today we just wait on any busy
2652 * locks... Perhaps we need to cancel converts in the
2653 * future? */
2654 ocfs2_wait_on_busy_lock(lockres);
2655
2656 spin_lock_irqsave(&lockres->l_lock, flags);
2657 }
2658
0d5dc6c2
MF		 2659 if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) {
2660 if (lockres->l_flags & OCFS2_LOCK_ATTACHED &&
bd3e7610 2661 lockres->l_level == DLM_LOCK_EX &&
0d5dc6c2
MF		 2662 !(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH))
2663 lockres->l_ops->set_lvb(lockres);
2664 }
ccd979bd
MF		 2665
2666 if (lockres->l_flags & OCFS2_LOCK_BUSY)
2667 mlog(ML_ERROR, "destroying busy lock: \"%s\"\n",
2668 lockres->l_name);
2669 if (lockres->l_flags & OCFS2_LOCK_BLOCKED)
2670 mlog(0, "destroying blocked lock: \"%s\"\n", lockres->l_name);
2671
2672 if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) {
2673 spin_unlock_irqrestore(&lockres->l_lock, flags);
2674 goto out;
2675 }
2676
2677 lockres_clear_flags(lockres, OCFS2_LOCK_ATTACHED);
2678
2679 /* make sure we never get here while waiting for an ast to
2680 * fire. */
2681 BUG_ON(lockres->l_action != OCFS2_AST_INVALID);
2682
2683 /* is this necessary? */
2684 lockres_or_flags(lockres, OCFS2_LOCK_BUSY);
2685 lockres->l_unlock_action = OCFS2_UNLOCK_DROP_LOCK;
2686 spin_unlock_irqrestore(&lockres->l_lock, flags);
2687
2688 mlog(0, "lock %s\n", lockres->l_name);
2689
7431cd7e
JB		 2690 ret = ocfs2_dlm_unlock(osb->dlm, &lockres->l_lksb, lkm_flags,
2691 lockres);
2692 if (ret) {
2693 ocfs2_log_dlm_error("ocfs2_dlm_unlock", ret, lockres);
ccd979bd
MF		 2694 mlog(ML_ERROR, "lockres flags: %lu\n", lockres->l_flags);
2695 dlm_print_one_lock(lockres->l_lksb.lockid);
2696 BUG();
2697 }
24ef1815 2698 mlog(0, "lock %s, successfull return from ocfs2_dlm_unlock\n",
ccd979bd
MF		 2699 lockres->l_name);
2700
2701 ocfs2_wait_on_busy_lock(lockres);
2702out:
2703 mlog_exit(0);
2704 return 0;
2705}
2706
2707/* Mark the lockres as being dropped. It will no longer be
2708 * queued if blocking, but we still may have to wait on it
34d024f8 2709 * being dequeued from the downconvert thread before we can consider
ccd979bd
MF		 2710 * it safe to drop.
2711 *
2712 * You can *not* attempt to call cluster_lock on this lockres anymore. */
2713void ocfs2_mark_lockres_freeing(struct ocfs2_lock_res *lockres)
2714{
2715 int status;
2716 struct ocfs2_mask_waiter mw;
2717 unsigned long flags;
2718
2719 ocfs2_init_mask_waiter(&mw);
2720
2721 spin_lock_irqsave(&lockres->l_lock, flags);
2722 lockres->l_flags |= OCFS2_LOCK_FREEING;
2723 while (lockres->l_flags & OCFS2_LOCK_QUEUED) {
2724 lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_QUEUED, 0);
2725 spin_unlock_irqrestore(&lockres->l_lock, flags);
2726
2727 mlog(0, "Waiting on lockres %s\n", lockres->l_name);
2728
2729 status = ocfs2_wait_for_mask(&mw);
2730 if (status)
2731 mlog_errno(status);
2732
2733 spin_lock_irqsave(&lockres->l_lock, flags);
2734 }
2735 spin_unlock_irqrestore(&lockres->l_lock, flags);
2736}
2737
d680efe9
MF		 2738void ocfs2_simple_drop_lockres(struct ocfs2_super *osb,
2739 struct ocfs2_lock_res *lockres)
ccd979bd 2740{
d680efe9 2741 int ret;
ccd979bd 2742
d680efe9 2743 ocfs2_mark_lockres_freeing(lockres);
0d5dc6c2 2744 ret = ocfs2_drop_lock(osb, lockres);
d680efe9
MF		 2745 if (ret)
2746 mlog_errno(ret);
2747}
ccd979bd 2748
d680efe9
MF		 2749static void ocfs2_drop_osb_locks(struct ocfs2_super *osb)
2750{
2751 ocfs2_simple_drop_lockres(osb, &osb->osb_super_lockres);
2752 ocfs2_simple_drop_lockres(osb, &osb->osb_rename_lockres);
ccd979bd
MF		 2753}
2754
ccd979bd
MF		 2755int ocfs2_drop_inode_locks(struct inode *inode)
2756{
2757 int status, err;
ccd979bd
MF		 2758
2759 mlog_entry_void();
2760
2761 /* No need to call ocfs2_mark_lockres_freeing here -
2762 * ocfs2_clear_inode has done it for us. */
2763
2764 err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb),
50008630 2765 &OCFS2_I(inode)->ip_open_lockres);
ccd979bd
MF		 2766 if (err < 0)
2767 mlog_errno(err);
2768
2769 status = err;
2770
2771 err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb),
e63aecb6 2772 &OCFS2_I(inode)->ip_inode_lockres);
ccd979bd
MF		 2773 if (err < 0)
2774 mlog_errno(err);
2775 if (err < 0 && !status)
2776 status = err;
2777
2778 err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb),
0d5dc6c2 2779 &OCFS2_I(inode)->ip_rw_lockres);
ccd979bd
MF		 2780 if (err < 0)
2781 mlog_errno(err);
2782 if (err < 0 && !status)
2783 status = err;
2784
2785 mlog_exit(status);
2786 return status;
2787}
2788
2789static void ocfs2_prepare_downconvert(struct ocfs2_lock_res *lockres,
2790 int new_level)
2791{
2792 assert_spin_locked(&lockres->l_lock);
2793
bd3e7610 2794 BUG_ON(lockres->l_blocking <= DLM_LOCK_NL);
ccd979bd
MF		 2795
2796 if (lockres->l_level <= new_level) {
bd3e7610 2797 mlog(ML_ERROR, "lockres->l_level (%d) <= new_level (%d)\n",
ccd979bd
MF		 2798 lockres->l_level, new_level);
2799 BUG();
2800 }
2801
2802 mlog(0, "lock %s, new_level = %d, l_blocking = %d\n",
2803 lockres->l_name, new_level, lockres->l_blocking);
2804
2805 lockres->l_action = OCFS2_AST_DOWNCONVERT;
2806 lockres->l_requested = new_level;
2807 lockres_or_flags(lockres, OCFS2_LOCK_BUSY);
2808}
2809
2810static int ocfs2_downconvert_lock(struct ocfs2_super *osb,
2811 struct ocfs2_lock_res *lockres,
2812 int new_level,
2813 int lvb)
2814{
bd3e7610
JB		 2815 int ret;
2816 u32 dlm_flags = DLM_LKF_CONVERT;
ccd979bd
MF		 2817
2818 mlog_entry_void();
2819
2820 if (lvb)
bd3e7610 2821 dlm_flags |= DLM_LKF_VALBLK;
ccd979bd 2822
7431cd7e
JB		 2823 ret = ocfs2_dlm_lock(osb->dlm,
2824 new_level,
2825 &lockres->l_lksb,
2826 dlm_flags,
2827 lockres->l_name,
2828 OCFS2_LOCK_ID_MAX_LEN - 1,
2829 lockres);
2830 if (ret) {
2831 ocfs2_log_dlm_error("ocfs2_dlm_lock", ret, lockres);
ccd979bd
MF		 2832 ocfs2_recover_from_dlm_error(lockres, 1);
2833 goto bail;
2834 }
2835
2836 ret = 0;
2837bail:
2838 mlog_exit(ret);
2839 return ret;
2840}
2841
24ef1815 2842/* returns 1 when the caller should unlock and call ocfs2_dlm_unlock */
ccd979bd
MF		 2843static int ocfs2_prepare_cancel_convert(struct ocfs2_super *osb,
2844 struct ocfs2_lock_res *lockres)
2845{
2846 assert_spin_locked(&lockres->l_lock);
2847
2848 mlog_entry_void();
2849 mlog(0, "lock %s\n", lockres->l_name);
2850
2851 if (lockres->l_unlock_action == OCFS2_UNLOCK_CANCEL_CONVERT) {
2852 /* If we're already trying to cancel a lock conversion
2853 * then just drop the spinlock and allow the caller to
2854 * requeue this lock. */
2855
2856 mlog(0, "Lockres %s, skip convert\n", lockres->l_name);
2857 return 0;
2858 }
2859
2860 /* were we in a convert when we got the bast fire? */
2861 BUG_ON(lockres->l_action != OCFS2_AST_CONVERT &&
2862 lockres->l_action != OCFS2_AST_DOWNCONVERT);
2863 /* set things up for the unlockast to know to just
2864 * clear out the ast_action and unset busy, etc. */
2865 lockres->l_unlock_action = OCFS2_UNLOCK_CANCEL_CONVERT;
2866
2867 mlog_bug_on_msg(!(lockres->l_flags & OCFS2_LOCK_BUSY),
2868 "lock %s, invalid flags: 0x%lx\n",
2869 lockres->l_name, lockres->l_flags);
2870
2871 return 1;
2872}
2873
2874static int ocfs2_cancel_convert(struct ocfs2_super *osb,
2875 struct ocfs2_lock_res *lockres)
2876{
2877 int ret;
ccd979bd
MF		 2878
2879 mlog_entry_void();
2880 mlog(0, "lock %s\n", lockres->l_name);
2881
7431cd7e
JB		 2882 ret = ocfs2_dlm_unlock(osb->dlm, &lockres->l_lksb,
2883 DLM_LKF_CANCEL, lockres);
2884 if (ret) {
2885 ocfs2_log_dlm_error("ocfs2_dlm_unlock", ret, lockres);
ccd979bd
MF		 2886 ocfs2_recover_from_dlm_error(lockres, 0);
2887 }
2888
24ef1815 2889 mlog(0, "lock %s return from ocfs2_dlm_unlock\n", lockres->l_name);
ccd979bd 2890
ccd979bd
MF		 2891 mlog_exit(ret);
2892 return ret;
2893}
2894
b5e500e2
MF		 2895static int ocfs2_unblock_lock(struct ocfs2_super *osb,
2896 struct ocfs2_lock_res *lockres,
2897 struct ocfs2_unblock_ctl *ctl)
ccd979bd
MF		 2898{
2899 unsigned long flags;
2900 int blocking;
2901 int new_level;
2902 int ret = 0;
5ef0d4ea 2903 int set_lvb = 0;
ccd979bd
MF		 2904
2905 mlog_entry_void();
2906
2907 spin_lock_irqsave(&lockres->l_lock, flags);
2908
2909 BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED));
2910
2911recheck:
2912 if (lockres->l_flags & OCFS2_LOCK_BUSY) {
d680efe9 2913 ctl->requeue = 1;
ccd979bd
MF		 2914 ret = ocfs2_prepare_cancel_convert(osb, lockres);
2915 spin_unlock_irqrestore(&lockres->l_lock, flags);
2916 if (ret) {
2917 ret = ocfs2_cancel_convert(osb, lockres);
2918 if (ret < 0)
2919 mlog_errno(ret);
2920 }
2921 goto leave;
2922 }
2923
2924 /* if we're blocking an exclusive and we have *any* holders,
2925 * then requeue. */
bd3e7610 2926 if ((lockres->l_blocking == DLM_LOCK_EX)
f7fbfdd1
MF		 2927 && (lockres->l_ex_holders || lockres->l_ro_holders))
2928 goto leave_requeue;
ccd979bd
MF		 2929
2930 /* If it's a PR we're blocking, then only
2931 * requeue if we've got any EX holders */
bd3e7610 2932 if (lockres->l_blocking == DLM_LOCK_PR &&
f7fbfdd1
MF		 2933 lockres->l_ex_holders)
2934 goto leave_requeue;
2935
2936 /*
2937 * Can we get a lock in this state if the holder counts are
2938 * zero? The meta data unblock code used to check this.
2939 */
2940 if ((lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH)
2941 && (lockres->l_flags & OCFS2_LOCK_REFRESHING))
2942 goto leave_requeue;
ccd979bd 2943
16d5b956
MF		 2944 new_level = ocfs2_highest_compat_lock_level(lockres->l_blocking);
2945
2946 if (lockres->l_ops->check_downconvert
2947 && !lockres->l_ops->check_downconvert(lockres, new_level))
2948 goto leave_requeue;
2949
ccd979bd
MF		 2950 /* If we get here, then we know that there are no more
2951 * incompatible holders (and anyone asking for an incompatible
2952 * lock is blocked). We can now downconvert the lock */
cc567d89 2953 if (!lockres->l_ops->downconvert_worker)
ccd979bd
MF		 2954 goto downconvert;
2955
2956 /* Some lockres types want to do a bit of work before
2957 * downconverting a lock. Allow that here. The worker function
2958 * may sleep, so we save off a copy of what we're blocking as
2959 * it may change while we're not holding the spin lock. */
2960 blocking = lockres->l_blocking;
2961 spin_unlock_irqrestore(&lockres->l_lock, flags);
2962
cc567d89 2963 ctl->unblock_action = lockres->l_ops->downconvert_worker(lockres, blocking);
d680efe9
MF		 2964
2965 if (ctl->unblock_action == UNBLOCK_STOP_POST)
2966 goto leave;
ccd979bd
MF		 2967
2968 spin_lock_irqsave(&lockres->l_lock, flags);
2969 if (blocking != lockres->l_blocking) {
2970 /* If this changed underneath us, then we can't drop
2971 * it just yet. */
2972 goto recheck;
2973 }
2974
2975downconvert:
d680efe9 2976 ctl->requeue = 0;
ccd979bd 2977
5ef0d4ea 2978 if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) {
bd3e7610 2979 if (lockres->l_level == DLM_LOCK_EX)
5ef0d4ea
MF		 2980 set_lvb = 1;
2981
2982 /*
2983 * We only set the lvb if the lock has been fully
2984 * refreshed - otherwise we risk setting stale
2985 * data. Otherwise, there's no need to actually clear
2986 * out the lvb here as it's value is still valid.
2987 */
2988 if (set_lvb && !(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH))
2989 lockres->l_ops->set_lvb(lockres);
2990 }
2991
ccd979bd
MF		 2992 ocfs2_prepare_downconvert(lockres, new_level);
2993 spin_unlock_irqrestore(&lockres->l_lock, flags);
5ef0d4ea 2994 ret = ocfs2_downconvert_lock(osb, lockres, new_level, set_lvb);
ccd979bd
MF		 2995leave:
2996 mlog_exit(ret);
2997 return ret;
f7fbfdd1
MF		 2998
2999leave_requeue:
3000 spin_unlock_irqrestore(&lockres->l_lock, flags);
3001 ctl->requeue = 1;
3002
3003 mlog_exit(0);
3004 return 0;
ccd979bd
MF		 3005}
3006
d680efe9
MF		 3007static int ocfs2_data_convert_worker(struct ocfs2_lock_res *lockres,
3008 int blocking)
ccd979bd
MF		 3009{
3010 struct inode *inode;
3011 struct address_space *mapping;
3012
ccd979bd
MF		 3013 inode = ocfs2_lock_res_inode(lockres);
3014 mapping = inode->i_mapping;
3015
1044e401 3016 if (!S_ISREG(inode->i_mode))
f1f54068
MF		 3017 goto out;
3018
7f4a2a97
MF		 3019 /*
3020 * We need this before the filemap_fdatawrite() so that it can
3021 * transfer the dirty bit from the PTE to the
3022 * page. Unfortunately this means that even for EX->PR
3023 * downconverts, we'll lose our mappings and have to build
3024 * them up again.
3025 */
3026 unmap_mapping_range(mapping, 0, 0, 0);
3027
ccd979bd 3028 if (filemap_fdatawrite(mapping)) {
b0697053
MF		 3029 mlog(ML_ERROR, "Could not sync inode %llu for downconvert!",
3030 (unsigned long long)OCFS2_I(inode)->ip_blkno);
ccd979bd
MF		 3031 }
3032 sync_mapping_buffers(mapping);
bd3e7610 3033 if (blocking == DLM_LOCK_EX) {
ccd979bd 3034 truncate_inode_pages(mapping, 0);
ccd979bd
MF		 3035 } else {
3036 /* We only need to wait on the I/O if we're not also
3037 * truncating pages because truncate_inode_pages waits
3038 * for us above. We don't truncate pages if we're
3039 * blocking anything < EXMODE because we want to keep
3040 * them around in that case. */
3041 filemap_fdatawait(mapping);
3042 }
3043
f1f54068 3044out:
d680efe9 3045 return UNBLOCK_CONTINUE;
ccd979bd
MF		 3046}
3047
810d5aeb
MF		 3048static int ocfs2_check_meta_downconvert(struct ocfs2_lock_res *lockres,
3049 int new_level)
3050{
3051 struct inode *inode = ocfs2_lock_res_inode(lockres);
3052 int checkpointed = ocfs2_inode_fully_checkpointed(inode);
3053
bd3e7610
JB		 3054 BUG_ON(new_level != DLM_LOCK_NL && new_level != DLM_LOCK_PR);
3055 BUG_ON(lockres->l_level != DLM_LOCK_EX && !checkpointed);
810d5aeb
MF		 3056
3057 if (checkpointed)
3058 return 1;
3059
3060 ocfs2_start_checkpoint(OCFS2_SB(inode->i_sb));
3061 return 0;
3062}
3063
3064static void ocfs2_set_meta_lvb(struct ocfs2_lock_res *lockres)
3065{
3066 struct inode *inode = ocfs2_lock_res_inode(lockres);
3067
3068 __ocfs2_stuff_meta_lvb(inode);
3069}
3070
d680efe9
MF		 3071/*
3072 * Does the final reference drop on our dentry lock. Right now this
34d024f8 3073 * happens in the downconvert thread, but we could choose to simplify the
d680efe9
MF		 3074 * dlmglue API and push these off to the ocfs2_wq in the future.
3075 */
3076static void ocfs2_dentry_post_unlock(struct ocfs2_super *osb,
3077 struct ocfs2_lock_res *lockres)
3078{
3079 struct ocfs2_dentry_lock *dl = ocfs2_lock_res_dl(lockres);
3080 ocfs2_dentry_lock_put(osb, dl);
3081}
3082
3083/*
3084 * d_delete() matching dentries before the lock downconvert.
3085 *
3086 * At this point, any process waiting to destroy the
3087 * dentry_lock due to last ref count is stopped by the
3088 * OCFS2_LOCK_QUEUED flag.
3089 *
3090 * We have two potential problems
3091 *
3092 * 1) If we do the last reference drop on our dentry_lock (via dput)
3093 * we'll wind up in ocfs2_release_dentry_lock(), waiting on
3094 * the downconvert to finish. Instead we take an elevated
3095 * reference and push the drop until after we've completed our
3096 * unblock processing.
3097 *
3098 * 2) There might be another process with a final reference,
3099 * waiting on us to finish processing. If this is the case, we
3100 * detect it and exit out - there's no more dentries anyway.
3101 */
3102static int ocfs2_dentry_convert_worker(struct ocfs2_lock_res *lockres,
3103 int blocking)
3104{
3105 struct ocfs2_dentry_lock *dl = ocfs2_lock_res_dl(lockres);
3106 struct ocfs2_inode_info *oi = OCFS2_I(dl->dl_inode);
3107 struct dentry *dentry;
3108 unsigned long flags;
3109 int extra_ref = 0;
3110
3111 /*
3112 * This node is blocking another node from getting a read
3113 * lock. This happens when we've renamed within a
3114 * directory. We've forced the other nodes to d_delete(), but
3115 * we never actually dropped our lock because it's still
3116 * valid. The downconvert code will retain a PR for this node,
3117 * so there's no further work to do.
3118 */
bd3e7610 3119 if (blocking == DLM_LOCK_PR)
d680efe9
MF		 3120 return UNBLOCK_CONTINUE;
3121
3122 /*
3123 * Mark this inode as potentially orphaned. The code in
3124 * ocfs2_delete_inode() will figure out whether it actually
3125 * needs to be freed or not.
3126 */
3127 spin_lock(&oi->ip_lock);
3128 oi->ip_flags |= OCFS2_INODE_MAYBE_ORPHANED;
3129 spin_unlock(&oi->ip_lock);
3130
3131 /*
3132 * Yuck. We need to make sure however that the check of
3133 * OCFS2_LOCK_FREEING and the extra reference are atomic with
3134 * respect to a reference decrement or the setting of that
3135 * flag.
3136 */
3137 spin_lock_irqsave(&lockres->l_lock, flags);
3138 spin_lock(&dentry_attach_lock);
3139 if (!(lockres->l_flags & OCFS2_LOCK_FREEING)
3140 && dl->dl_count) {
3141 dl->dl_count++;
3142 extra_ref = 1;
3143 }
3144 spin_unlock(&dentry_attach_lock);
3145 spin_unlock_irqrestore(&lockres->l_lock, flags);
3146
3147 mlog(0, "extra_ref = %d\n", extra_ref);
3148
3149 /*
3150 * We have a process waiting on us in ocfs2_dentry_iput(),
3151 * which means we can't have any more outstanding
3152 * aliases. There's no need to do any more work.
3153 */
3154 if (!extra_ref)
3155 return UNBLOCK_CONTINUE;
3156
3157 spin_lock(&dentry_attach_lock);
3158 while (1) {
3159 dentry = ocfs2_find_local_alias(dl->dl_inode,
3160 dl->dl_parent_blkno, 1);
3161 if (!dentry)
3162 break;
3163 spin_unlock(&dentry_attach_lock);
3164
3165 mlog(0, "d_delete(%.*s);\n", dentry->d_name.len,
3166 dentry->d_name.name);
3167
3168 /*
3169 * The following dcache calls may do an
3170 * iput(). Normally we don't want that from the
3171 * downconverting thread, but in this case it's ok
3172 * because the requesting node already has an
3173 * exclusive lock on the inode, so it can't be queued
3174 * for a downconvert.
3175 */
3176 d_delete(dentry);
3177 dput(dentry);
3178
3179 spin_lock(&dentry_attach_lock);
3180 }
3181 spin_unlock(&dentry_attach_lock);
3182
3183 /*
3184 * If we are the last holder of this dentry lock, there is no
3185 * reason to downconvert so skip straight to the unlock.
3186 */
3187 if (dl->dl_count == 1)
3188 return UNBLOCK_STOP_POST;
3189
3190 return UNBLOCK_CONTINUE_POST;
3191}
3192
24ef1815
JB		 3193static struct ocfs2_locking_protocol lproto = {
3194 .lp_lock_ast = ocfs2_locking_ast,
3195 .lp_blocking_ast = ocfs2_blocking_ast,
3196 .lp_unlock_ast = ocfs2_unlock_ast,
3197};
3198
3199/* This interface isn't the final one, hence the less-than-perfect names */
3200void dlmglue_init_stack(void)
3201{
3202 o2cb_get_stack(&lproto);
3203}
3204
3205void dlmglue_exit_stack(void)
3206{
3207 o2cb_put_stack();
3208}
3209
00600056
AB		 3210static void ocfs2_process_blocked_lock(struct ocfs2_super *osb,
3211 struct ocfs2_lock_res *lockres)
ccd979bd
MF		 3212{
3213 int status;
d680efe9 3214 struct ocfs2_unblock_ctl ctl = {0, 0,};
ccd979bd
MF		 3215 unsigned long flags;
3216
3217 /* Our reference to the lockres in this function can be
3218 * considered valid until we remove the OCFS2_LOCK_QUEUED
3219 * flag. */
3220
3221 mlog_entry_void();
3222
3223 BUG_ON(!lockres);
3224 BUG_ON(!lockres->l_ops);
ccd979bd
MF		 3225
3226 mlog(0, "lockres %s blocked.\n", lockres->l_name);
3227
3228 /* Detect whether a lock has been marked as going away while
34d024f8 3229 * the downconvert thread was processing other things. A lock can
ccd979bd
MF		 3230 * still be marked with OCFS2_LOCK_FREEING after this check,
3231 * but short circuiting here will still save us some
3232 * performance. */
3233 spin_lock_irqsave(&lockres->l_lock, flags);
3234 if (lockres->l_flags & OCFS2_LOCK_FREEING)
3235 goto unqueue;
3236 spin_unlock_irqrestore(&lockres->l_lock, flags);
3237
b5e500e2 3238 status = ocfs2_unblock_lock(osb, lockres, &ctl);
ccd979bd
MF		 3239 if (status < 0)
3240 mlog_errno(status);
3241
3242 spin_lock_irqsave(&lockres->l_lock, flags);
3243unqueue:
d680efe9 3244 if (lockres->l_flags & OCFS2_LOCK_FREEING || !ctl.requeue) {
ccd979bd
MF		 3245 lockres_clear_flags(lockres, OCFS2_LOCK_QUEUED);
3246 } else
3247 ocfs2_schedule_blocked_lock(osb, lockres);
3248
3249 mlog(0, "lockres %s, requeue = %s.\n", lockres->l_name,
d680efe9 3250 ctl.requeue ? "yes" : "no");
ccd979bd
MF		 3251 spin_unlock_irqrestore(&lockres->l_lock, flags);
3252
d680efe9
MF		 3253 if (ctl.unblock_action != UNBLOCK_CONTINUE
3254 && lockres->l_ops->post_unlock)
3255 lockres->l_ops->post_unlock(osb, lockres);
3256
ccd979bd
MF		 3257 mlog_exit_void();
3258}
3259
3260static void ocfs2_schedule_blocked_lock(struct ocfs2_super *osb,
3261 struct ocfs2_lock_res *lockres)
3262{
3263 mlog_entry_void();
3264
3265 assert_spin_locked(&lockres->l_lock);
3266
3267 if (lockres->l_flags & OCFS2_LOCK_FREEING) {
3268 /* Do not schedule a lock for downconvert when it's on
3269 * the way to destruction - any nodes wanting access
3270 * to the resource will get it soon. */
3271 mlog(0, "Lockres %s won't be scheduled: flags 0x%lx\n",
3272 lockres->l_name, lockres->l_flags);
3273 return;
3274 }
3275
3276 lockres_or_flags(lockres, OCFS2_LOCK_QUEUED);
3277
34d024f8 3278 spin_lock(&osb->dc_task_lock);
ccd979bd
MF		 3279 if (list_empty(&lockres->l_blocked_list)) {
3280 list_add_tail(&lockres->l_blocked_list,
3281 &osb->blocked_lock_list);
3282 osb->blocked_lock_count++;
3283 }
34d024f8 3284 spin_unlock(&osb->dc_task_lock);
ccd979bd
MF		 3285
3286 mlog_exit_void();
3287}
34d024f8
MF		 3288
3289static void ocfs2_downconvert_thread_do_work(struct ocfs2_super *osb)
3290{
3291 unsigned long processed;
3292 struct ocfs2_lock_res *lockres;
3293
3294 mlog_entry_void();
3295
3296 spin_lock(&osb->dc_task_lock);
3297 /* grab this early so we know to try again if a state change and
3298 * wake happens part-way through our work */
3299 osb->dc_work_sequence = osb->dc_wake_sequence;
3300
3301 processed = osb->blocked_lock_count;
3302 while (processed) {
3303 BUG_ON(list_empty(&osb->blocked_lock_list));
3304
3305 lockres = list_entry(osb->blocked_lock_list.next,
3306 struct ocfs2_lock_res, l_blocked_list);
3307 list_del_init(&lockres->l_blocked_list);
3308 osb->blocked_lock_count--;
3309 spin_unlock(&osb->dc_task_lock);
3310
3311 BUG_ON(!processed);
3312 processed--;
3313
3314 ocfs2_process_blocked_lock(osb, lockres);
3315
3316 spin_lock(&osb->dc_task_lock);
3317 }
3318 spin_unlock(&osb->dc_task_lock);
3319
3320 mlog_exit_void();
3321}
3322
3323static int ocfs2_downconvert_thread_lists_empty(struct ocfs2_super *osb)
3324{
3325 int empty = 0;
3326
3327 spin_lock(&osb->dc_task_lock);
3328 if (list_empty(&osb->blocked_lock_list))
3329 empty = 1;
3330
3331 spin_unlock(&osb->dc_task_lock);
3332 return empty;
3333}
3334
3335static int ocfs2_downconvert_thread_should_wake(struct ocfs2_super *osb)
3336{
3337 int should_wake = 0;
3338
3339 spin_lock(&osb->dc_task_lock);
3340 if (osb->dc_work_sequence != osb->dc_wake_sequence)
3341 should_wake = 1;
3342 spin_unlock(&osb->dc_task_lock);
3343
3344 return should_wake;
3345}
3346
200bfae3 3347static int ocfs2_downconvert_thread(void *arg)
34d024f8
MF		 3348{
3349 int status = 0;
3350 struct ocfs2_super *osb = arg;
3351
3352 /* only quit once we've been asked to stop and there is no more
3353 * work available */
3354 while (!(kthread_should_stop() &&
3355 ocfs2_downconvert_thread_lists_empty(osb))) {
3356
3357 wait_event_interruptible(osb->dc_event,
3358 ocfs2_downconvert_thread_should_wake(osb) ||
3359 kthread_should_stop());
3360
3361 mlog(0, "downconvert_thread: awoken\n");
3362
3363 ocfs2_downconvert_thread_do_work(osb);
3364 }
3365
3366 osb->dc_task = NULL;
3367 return status;
3368}
3369
3370void ocfs2_wake_downconvert_thread(struct ocfs2_super *osb)
3371{
3372 spin_lock(&osb->dc_task_lock);
3373 /* make sure the voting thread gets a swipe at whatever changes
3374 * the caller may have made to the voting state */
3375 osb->dc_wake_sequence++;
3376 spin_unlock(&osb->dc_task_lock);
3377 wake_up(&osb->dc_event);
3378}
kernel source for telekom puls (alcatel/mediatek)