1 /* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
6 * Code which implements an OCFS2 specific interface to our DLM.
8 * Copyright (C) 2003, 2004 Oracle. All rights reserved.
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.
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.
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.
26 #include <linux/types.h>
27 #include <linux/slab.h>
28 #include <linux/highmem.h>
30 #include <linux/kthread.h>
31 #include <linux/pagemap.h>
32 #include <linux/debugfs.h>
33 #include <linux/seq_file.h>
34 #include <linux/time.h>
35 #include <linux/quotaops.h>
37 #define MLOG_MASK_PREFIX ML_DLM_GLUE
38 #include <cluster/masklog.h>
41 #include "ocfs2_lockingver.h"
46 #include "extent_map.h"
48 #include "heartbeat.h"
51 #include "stackglue.h"
56 #include "refcounttree.h"
58 #include "buffer_head_io.h"
60 struct ocfs2_mask_waiter
{
61 struct list_head mw_item
;
63 struct completion mw_complete
;
64 unsigned long mw_mask
;
65 unsigned long mw_goal
;
66 #ifdef CONFIG_OCFS2_FS_STATS
67 unsigned long long mw_lock_start
;
71 static struct ocfs2_super
*ocfs2_get_dentry_osb(struct ocfs2_lock_res
*lockres
);
72 static struct ocfs2_super
*ocfs2_get_inode_osb(struct ocfs2_lock_res
*lockres
);
73 static struct ocfs2_super
*ocfs2_get_file_osb(struct ocfs2_lock_res
*lockres
);
74 static struct ocfs2_super
*ocfs2_get_qinfo_osb(struct ocfs2_lock_res
*lockres
);
77 * Return value from ->downconvert_worker functions.
79 * These control the precise actions of ocfs2_unblock_lock()
80 * and ocfs2_process_blocked_lock()
83 enum ocfs2_unblock_action
{
84 UNBLOCK_CONTINUE
= 0, /* Continue downconvert */
85 UNBLOCK_CONTINUE_POST
= 1, /* Continue downconvert, fire
86 * ->post_unlock callback */
87 UNBLOCK_STOP_POST
= 2, /* Do not downconvert, fire
88 * ->post_unlock() callback. */
91 struct ocfs2_unblock_ctl
{
93 enum ocfs2_unblock_action unblock_action
;
96 /* Lockdep class keys */
97 struct lock_class_key lockdep_keys
[OCFS2_NUM_LOCK_TYPES
];
99 static int ocfs2_check_meta_downconvert(struct ocfs2_lock_res
*lockres
,
101 static void ocfs2_set_meta_lvb(struct ocfs2_lock_res
*lockres
);
103 static int ocfs2_data_convert_worker(struct ocfs2_lock_res
*lockres
,
106 static int ocfs2_dentry_convert_worker(struct ocfs2_lock_res
*lockres
,
109 static void ocfs2_dentry_post_unlock(struct ocfs2_super
*osb
,
110 struct ocfs2_lock_res
*lockres
);
112 static void ocfs2_set_qinfo_lvb(struct ocfs2_lock_res
*lockres
);
114 static int ocfs2_check_refcount_downconvert(struct ocfs2_lock_res
*lockres
,
116 static int ocfs2_refcount_convert_worker(struct ocfs2_lock_res
*lockres
,
119 #define mlog_meta_lvb(__level, __lockres) ocfs2_dump_meta_lvb_info(__level, __PRETTY_FUNCTION__, __LINE__, __lockres)
121 /* This aids in debugging situations where a bad LVB might be involved. */
122 static void ocfs2_dump_meta_lvb_info(u64 level
,
123 const char *function
,
125 struct ocfs2_lock_res
*lockres
)
127 struct ocfs2_meta_lvb
*lvb
= ocfs2_dlm_lvb(&lockres
->l_lksb
);
129 mlog(level
, "LVB information for %s (called from %s:%u):\n",
130 lockres
->l_name
, function
, line
);
131 mlog(level
, "version: %u, clusters: %u, generation: 0x%x\n",
132 lvb
->lvb_version
, be32_to_cpu(lvb
->lvb_iclusters
),
133 be32_to_cpu(lvb
->lvb_igeneration
));
134 mlog(level
, "size: %llu, uid %u, gid %u, mode 0x%x\n",
135 (unsigned long long)be64_to_cpu(lvb
->lvb_isize
),
136 be32_to_cpu(lvb
->lvb_iuid
), be32_to_cpu(lvb
->lvb_igid
),
137 be16_to_cpu(lvb
->lvb_imode
));
138 mlog(level
, "nlink %u, atime_packed 0x%llx, ctime_packed 0x%llx, "
139 "mtime_packed 0x%llx iattr 0x%x\n", be16_to_cpu(lvb
->lvb_inlink
),
140 (long long)be64_to_cpu(lvb
->lvb_iatime_packed
),
141 (long long)be64_to_cpu(lvb
->lvb_ictime_packed
),
142 (long long)be64_to_cpu(lvb
->lvb_imtime_packed
),
143 be32_to_cpu(lvb
->lvb_iattr
));
148 * OCFS2 Lock Resource Operations
150 * These fine tune the behavior of the generic dlmglue locking infrastructure.
152 * The most basic of lock types can point ->l_priv to their respective
153 * struct ocfs2_super and allow the default actions to manage things.
155 * Right now, each lock type also needs to implement an init function,
156 * and trivial lock/unlock wrappers. ocfs2_simple_drop_lockres()
157 * should be called when the lock is no longer needed (i.e., object
160 struct ocfs2_lock_res_ops
{
162 * Translate an ocfs2_lock_res * into an ocfs2_super *. Define
163 * this callback if ->l_priv is not an ocfs2_super pointer
165 struct ocfs2_super
* (*get_osb
)(struct ocfs2_lock_res
*);
168 * Optionally called in the downconvert thread after a
169 * successful downconvert. The lockres will not be referenced
170 * after this callback is called, so it is safe to free
173 * The exact semantics of when this is called are controlled
174 * by ->downconvert_worker()
176 void (*post_unlock
)(struct ocfs2_super
*, struct ocfs2_lock_res
*);
179 * Allow a lock type to add checks to determine whether it is
180 * safe to downconvert a lock. Return 0 to re-queue the
181 * downconvert at a later time, nonzero to continue.
183 * For most locks, the default checks that there are no
184 * incompatible holders are sufficient.
186 * Called with the lockres spinlock held.
188 int (*check_downconvert
)(struct ocfs2_lock_res
*, int);
191 * Allows a lock type to populate the lock value block. This
192 * is called on downconvert, and when we drop a lock.
194 * Locks that want to use this should set LOCK_TYPE_USES_LVB
195 * in the flags field.
197 * Called with the lockres spinlock held.
199 void (*set_lvb
)(struct ocfs2_lock_res
*);
202 * Called from the downconvert thread when it is determined
203 * that a lock will be downconverted. This is called without
204 * any locks held so the function can do work that might
205 * schedule (syncing out data, etc).
207 * This should return any one of the ocfs2_unblock_action
208 * values, depending on what it wants the thread to do.
210 int (*downconvert_worker
)(struct ocfs2_lock_res
*, int);
213 * LOCK_TYPE_* flags which describe the specific requirements
214 * of a lock type. Descriptions of each individual flag follow.
220 * Some locks want to "refresh" potentially stale data when a
221 * meaningful (PRMODE or EXMODE) lock level is first obtained. If this
222 * flag is set, the OCFS2_LOCK_NEEDS_REFRESH flag will be set on the
223 * individual lockres l_flags member from the ast function. It is
224 * expected that the locking wrapper will clear the
225 * OCFS2_LOCK_NEEDS_REFRESH flag when done.
227 #define LOCK_TYPE_REQUIRES_REFRESH 0x1
230 * Indicate that a lock type makes use of the lock value block. The
231 * ->set_lvb lock type callback must be defined.
233 #define LOCK_TYPE_USES_LVB 0x2
235 static struct ocfs2_lock_res_ops ocfs2_inode_rw_lops
= {
236 .get_osb
= ocfs2_get_inode_osb
,
240 static struct ocfs2_lock_res_ops ocfs2_inode_inode_lops
= {
241 .get_osb
= ocfs2_get_inode_osb
,
242 .check_downconvert
= ocfs2_check_meta_downconvert
,
243 .set_lvb
= ocfs2_set_meta_lvb
,
244 .downconvert_worker
= ocfs2_data_convert_worker
,
245 .flags
= LOCK_TYPE_REQUIRES_REFRESH
|LOCK_TYPE_USES_LVB
,
248 static struct ocfs2_lock_res_ops ocfs2_super_lops
= {
249 .flags
= LOCK_TYPE_REQUIRES_REFRESH
,
252 static struct ocfs2_lock_res_ops ocfs2_rename_lops
= {
256 static struct ocfs2_lock_res_ops ocfs2_nfs_sync_lops
= {
260 static struct ocfs2_lock_res_ops ocfs2_orphan_scan_lops
= {
261 .flags
= LOCK_TYPE_REQUIRES_REFRESH
|LOCK_TYPE_USES_LVB
,
264 static struct ocfs2_lock_res_ops ocfs2_dentry_lops
= {
265 .get_osb
= ocfs2_get_dentry_osb
,
266 .post_unlock
= ocfs2_dentry_post_unlock
,
267 .downconvert_worker
= ocfs2_dentry_convert_worker
,
271 static struct ocfs2_lock_res_ops ocfs2_inode_open_lops
= {
272 .get_osb
= ocfs2_get_inode_osb
,
276 static struct ocfs2_lock_res_ops ocfs2_flock_lops
= {
277 .get_osb
= ocfs2_get_file_osb
,
281 static struct ocfs2_lock_res_ops ocfs2_qinfo_lops
= {
282 .set_lvb
= ocfs2_set_qinfo_lvb
,
283 .get_osb
= ocfs2_get_qinfo_osb
,
284 .flags
= LOCK_TYPE_REQUIRES_REFRESH
| LOCK_TYPE_USES_LVB
,
287 static struct ocfs2_lock_res_ops ocfs2_refcount_block_lops
= {
288 .check_downconvert
= ocfs2_check_refcount_downconvert
,
289 .downconvert_worker
= ocfs2_refcount_convert_worker
,
293 static inline int ocfs2_is_inode_lock(struct ocfs2_lock_res
*lockres
)
295 return lockres
->l_type
== OCFS2_LOCK_TYPE_META
||
296 lockres
->l_type
== OCFS2_LOCK_TYPE_RW
||
297 lockres
->l_type
== OCFS2_LOCK_TYPE_OPEN
;
300 static inline struct inode
*ocfs2_lock_res_inode(struct ocfs2_lock_res
*lockres
)
302 BUG_ON(!ocfs2_is_inode_lock(lockres
));
304 return (struct inode
*) lockres
->l_priv
;
307 static inline struct ocfs2_dentry_lock
*ocfs2_lock_res_dl(struct ocfs2_lock_res
*lockres
)
309 BUG_ON(lockres
->l_type
!= OCFS2_LOCK_TYPE_DENTRY
);
311 return (struct ocfs2_dentry_lock
*)lockres
->l_priv
;
314 static inline struct ocfs2_mem_dqinfo
*ocfs2_lock_res_qinfo(struct ocfs2_lock_res
*lockres
)
316 BUG_ON(lockres
->l_type
!= OCFS2_LOCK_TYPE_QINFO
);
318 return (struct ocfs2_mem_dqinfo
*)lockres
->l_priv
;
321 static inline struct ocfs2_refcount_tree
*
322 ocfs2_lock_res_refcount_tree(struct ocfs2_lock_res
*res
)
324 return container_of(res
, struct ocfs2_refcount_tree
, rf_lockres
);
327 static inline struct ocfs2_super
*ocfs2_get_lockres_osb(struct ocfs2_lock_res
*lockres
)
329 if (lockres
->l_ops
->get_osb
)
330 return lockres
->l_ops
->get_osb(lockres
);
332 return (struct ocfs2_super
*)lockres
->l_priv
;
335 static int ocfs2_lock_create(struct ocfs2_super
*osb
,
336 struct ocfs2_lock_res
*lockres
,
339 static inline int ocfs2_may_continue_on_blocked_lock(struct ocfs2_lock_res
*lockres
,
341 static void __ocfs2_cluster_unlock(struct ocfs2_super
*osb
,
342 struct ocfs2_lock_res
*lockres
,
343 int level
, unsigned long caller_ip
);
344 static inline void ocfs2_cluster_unlock(struct ocfs2_super
*osb
,
345 struct ocfs2_lock_res
*lockres
,
348 __ocfs2_cluster_unlock(osb
, lockres
, level
, _RET_IP_
);
351 static inline void ocfs2_generic_handle_downconvert_action(struct ocfs2_lock_res
*lockres
);
352 static inline void ocfs2_generic_handle_convert_action(struct ocfs2_lock_res
*lockres
);
353 static inline void ocfs2_generic_handle_attach_action(struct ocfs2_lock_res
*lockres
);
354 static int ocfs2_generic_handle_bast(struct ocfs2_lock_res
*lockres
, int level
);
355 static void ocfs2_schedule_blocked_lock(struct ocfs2_super
*osb
,
356 struct ocfs2_lock_res
*lockres
);
357 static inline void ocfs2_recover_from_dlm_error(struct ocfs2_lock_res
*lockres
,
359 #define ocfs2_log_dlm_error(_func, _err, _lockres) do { \
360 if ((_lockres)->l_type != OCFS2_LOCK_TYPE_DENTRY) \
361 mlog(ML_ERROR, "DLM error %d while calling %s on resource %s\n", \
362 _err, _func, _lockres->l_name); \
364 mlog(ML_ERROR, "DLM error %d while calling %s on resource %.*s%08x\n", \
365 _err, _func, OCFS2_DENTRY_LOCK_INO_START - 1, (_lockres)->l_name, \
366 (unsigned int)ocfs2_get_dentry_lock_ino(_lockres)); \
368 static int ocfs2_downconvert_thread(void *arg
);
369 static void ocfs2_downconvert_on_unlock(struct ocfs2_super
*osb
,
370 struct ocfs2_lock_res
*lockres
);
371 static int ocfs2_inode_lock_update(struct inode
*inode
,
372 struct buffer_head
**bh
);
373 static void ocfs2_drop_osb_locks(struct ocfs2_super
*osb
);
374 static inline int ocfs2_highest_compat_lock_level(int level
);
375 static unsigned int ocfs2_prepare_downconvert(struct ocfs2_lock_res
*lockres
,
377 static int ocfs2_downconvert_lock(struct ocfs2_super
*osb
,
378 struct ocfs2_lock_res
*lockres
,
381 unsigned int generation
);
382 static int ocfs2_prepare_cancel_convert(struct ocfs2_super
*osb
,
383 struct ocfs2_lock_res
*lockres
);
384 static int ocfs2_cancel_convert(struct ocfs2_super
*osb
,
385 struct ocfs2_lock_res
*lockres
);
388 static void ocfs2_build_lock_name(enum ocfs2_lock_type type
,
397 BUG_ON(type
>= OCFS2_NUM_LOCK_TYPES
);
399 len
= snprintf(name
, OCFS2_LOCK_ID_MAX_LEN
, "%c%s%016llx%08x",
400 ocfs2_lock_type_char(type
), OCFS2_LOCK_ID_PAD
,
401 (long long)blkno
, generation
);
403 BUG_ON(len
!= (OCFS2_LOCK_ID_MAX_LEN
- 1));
405 mlog(0, "built lock resource with name: %s\n", name
);
410 static DEFINE_SPINLOCK(ocfs2_dlm_tracking_lock
);
412 static void ocfs2_add_lockres_tracking(struct ocfs2_lock_res
*res
,
413 struct ocfs2_dlm_debug
*dlm_debug
)
415 mlog(0, "Add tracking for lockres %s\n", res
->l_name
);
417 spin_lock(&ocfs2_dlm_tracking_lock
);
418 list_add(&res
->l_debug_list
, &dlm_debug
->d_lockres_tracking
);
419 spin_unlock(&ocfs2_dlm_tracking_lock
);
422 static void ocfs2_remove_lockres_tracking(struct ocfs2_lock_res
*res
)
424 spin_lock(&ocfs2_dlm_tracking_lock
);
425 if (!list_empty(&res
->l_debug_list
))
426 list_del_init(&res
->l_debug_list
);
427 spin_unlock(&ocfs2_dlm_tracking_lock
);
430 #ifdef CONFIG_OCFS2_FS_STATS
431 static void ocfs2_init_lock_stats(struct ocfs2_lock_res
*res
)
433 res
->l_lock_num_prmode
= 0;
434 res
->l_lock_num_prmode_failed
= 0;
435 res
->l_lock_total_prmode
= 0;
436 res
->l_lock_max_prmode
= 0;
437 res
->l_lock_num_exmode
= 0;
438 res
->l_lock_num_exmode_failed
= 0;
439 res
->l_lock_total_exmode
= 0;
440 res
->l_lock_max_exmode
= 0;
441 res
->l_lock_refresh
= 0;
444 static void ocfs2_update_lock_stats(struct ocfs2_lock_res
*res
, int level
,
445 struct ocfs2_mask_waiter
*mw
, int ret
)
447 unsigned long long *num
, *sum
;
448 unsigned int *max
, *failed
;
449 struct timespec ts
= current_kernel_time();
450 unsigned long long time
= timespec_to_ns(&ts
) - mw
->mw_lock_start
;
452 if (level
== LKM_PRMODE
) {
453 num
= &res
->l_lock_num_prmode
;
454 sum
= &res
->l_lock_total_prmode
;
455 max
= &res
->l_lock_max_prmode
;
456 failed
= &res
->l_lock_num_prmode_failed
;
457 } else if (level
== LKM_EXMODE
) {
458 num
= &res
->l_lock_num_exmode
;
459 sum
= &res
->l_lock_total_exmode
;
460 max
= &res
->l_lock_max_exmode
;
461 failed
= &res
->l_lock_num_exmode_failed
;
473 static inline void ocfs2_track_lock_refresh(struct ocfs2_lock_res
*lockres
)
475 lockres
->l_lock_refresh
++;
478 static inline void ocfs2_init_start_time(struct ocfs2_mask_waiter
*mw
)
480 struct timespec ts
= current_kernel_time();
481 mw
->mw_lock_start
= timespec_to_ns(&ts
);
484 static inline void ocfs2_init_lock_stats(struct ocfs2_lock_res
*res
)
487 static inline void ocfs2_update_lock_stats(struct ocfs2_lock_res
*res
,
488 int level
, struct ocfs2_mask_waiter
*mw
, int ret
)
491 static inline void ocfs2_track_lock_refresh(struct ocfs2_lock_res
*lockres
)
494 static inline void ocfs2_init_start_time(struct ocfs2_mask_waiter
*mw
)
499 static void ocfs2_lock_res_init_common(struct ocfs2_super
*osb
,
500 struct ocfs2_lock_res
*res
,
501 enum ocfs2_lock_type type
,
502 struct ocfs2_lock_res_ops
*ops
,
509 res
->l_level
= DLM_LOCK_IV
;
510 res
->l_requested
= DLM_LOCK_IV
;
511 res
->l_blocking
= DLM_LOCK_IV
;
512 res
->l_action
= OCFS2_AST_INVALID
;
513 res
->l_unlock_action
= OCFS2_UNLOCK_INVALID
;
515 res
->l_flags
= OCFS2_LOCK_INITIALIZED
;
517 ocfs2_add_lockres_tracking(res
, osb
->osb_dlm_debug
);
519 ocfs2_init_lock_stats(res
);
520 #ifdef CONFIG_DEBUG_LOCK_ALLOC
521 if (type
!= OCFS2_LOCK_TYPE_OPEN
)
522 lockdep_init_map(&res
->l_lockdep_map
, ocfs2_lock_type_strings
[type
],
523 &lockdep_keys
[type
], 0);
525 res
->l_lockdep_map
.key
= NULL
;
529 void ocfs2_lock_res_init_once(struct ocfs2_lock_res
*res
)
531 /* This also clears out the lock status block */
532 memset(res
, 0, sizeof(struct ocfs2_lock_res
));
533 spin_lock_init(&res
->l_lock
);
534 init_waitqueue_head(&res
->l_event
);
535 INIT_LIST_HEAD(&res
->l_blocked_list
);
536 INIT_LIST_HEAD(&res
->l_mask_waiters
);
539 void ocfs2_inode_lock_res_init(struct ocfs2_lock_res
*res
,
540 enum ocfs2_lock_type type
,
541 unsigned int generation
,
544 struct ocfs2_lock_res_ops
*ops
;
547 case OCFS2_LOCK_TYPE_RW
:
548 ops
= &ocfs2_inode_rw_lops
;
550 case OCFS2_LOCK_TYPE_META
:
551 ops
= &ocfs2_inode_inode_lops
;
553 case OCFS2_LOCK_TYPE_OPEN
:
554 ops
= &ocfs2_inode_open_lops
;
557 mlog_bug_on_msg(1, "type: %d\n", type
);
558 ops
= NULL
; /* thanks, gcc */
562 ocfs2_build_lock_name(type
, OCFS2_I(inode
)->ip_blkno
,
563 generation
, res
->l_name
);
564 ocfs2_lock_res_init_common(OCFS2_SB(inode
->i_sb
), res
, type
, ops
, inode
);
567 static struct ocfs2_super
*ocfs2_get_inode_osb(struct ocfs2_lock_res
*lockres
)
569 struct inode
*inode
= ocfs2_lock_res_inode(lockres
);
571 return OCFS2_SB(inode
->i_sb
);
574 static struct ocfs2_super
*ocfs2_get_qinfo_osb(struct ocfs2_lock_res
*lockres
)
576 struct ocfs2_mem_dqinfo
*info
= lockres
->l_priv
;
578 return OCFS2_SB(info
->dqi_gi
.dqi_sb
);
581 static struct ocfs2_super
*ocfs2_get_file_osb(struct ocfs2_lock_res
*lockres
)
583 struct ocfs2_file_private
*fp
= lockres
->l_priv
;
585 return OCFS2_SB(fp
->fp_file
->f_mapping
->host
->i_sb
);
588 static __u64
ocfs2_get_dentry_lock_ino(struct ocfs2_lock_res
*lockres
)
590 __be64 inode_blkno_be
;
592 memcpy(&inode_blkno_be
, &lockres
->l_name
[OCFS2_DENTRY_LOCK_INO_START
],
595 return be64_to_cpu(inode_blkno_be
);
598 static struct ocfs2_super
*ocfs2_get_dentry_osb(struct ocfs2_lock_res
*lockres
)
600 struct ocfs2_dentry_lock
*dl
= lockres
->l_priv
;
602 return OCFS2_SB(dl
->dl_inode
->i_sb
);
605 void ocfs2_dentry_lock_res_init(struct ocfs2_dentry_lock
*dl
,
606 u64 parent
, struct inode
*inode
)
609 u64 inode_blkno
= OCFS2_I(inode
)->ip_blkno
;
610 __be64 inode_blkno_be
= cpu_to_be64(inode_blkno
);
611 struct ocfs2_lock_res
*lockres
= &dl
->dl_lockres
;
613 ocfs2_lock_res_init_once(lockres
);
616 * Unfortunately, the standard lock naming scheme won't work
617 * here because we have two 16 byte values to use. Instead,
618 * we'll stuff the inode number as a binary value. We still
619 * want error prints to show something without garbling the
620 * display, so drop a null byte in there before the inode
621 * number. A future version of OCFS2 will likely use all
622 * binary lock names. The stringified names have been a
623 * tremendous aid in debugging, but now that the debugfs
624 * interface exists, we can mangle things there if need be.
626 * NOTE: We also drop the standard "pad" value (the total lock
627 * name size stays the same though - the last part is all
628 * zeros due to the memset in ocfs2_lock_res_init_once()
630 len
= snprintf(lockres
->l_name
, OCFS2_DENTRY_LOCK_INO_START
,
632 ocfs2_lock_type_char(OCFS2_LOCK_TYPE_DENTRY
),
635 BUG_ON(len
!= (OCFS2_DENTRY_LOCK_INO_START
- 1));
637 memcpy(&lockres
->l_name
[OCFS2_DENTRY_LOCK_INO_START
], &inode_blkno_be
,
640 ocfs2_lock_res_init_common(OCFS2_SB(inode
->i_sb
), lockres
,
641 OCFS2_LOCK_TYPE_DENTRY
, &ocfs2_dentry_lops
,
645 static void ocfs2_super_lock_res_init(struct ocfs2_lock_res
*res
,
646 struct ocfs2_super
*osb
)
648 /* Superblock lockres doesn't come from a slab so we call init
649 * once on it manually. */
650 ocfs2_lock_res_init_once(res
);
651 ocfs2_build_lock_name(OCFS2_LOCK_TYPE_SUPER
, OCFS2_SUPER_BLOCK_BLKNO
,
653 ocfs2_lock_res_init_common(osb
, res
, OCFS2_LOCK_TYPE_SUPER
,
654 &ocfs2_super_lops
, osb
);
657 static void ocfs2_rename_lock_res_init(struct ocfs2_lock_res
*res
,
658 struct ocfs2_super
*osb
)
660 /* Rename lockres doesn't come from a slab so we call init
661 * once on it manually. */
662 ocfs2_lock_res_init_once(res
);
663 ocfs2_build_lock_name(OCFS2_LOCK_TYPE_RENAME
, 0, 0, res
->l_name
);
664 ocfs2_lock_res_init_common(osb
, res
, OCFS2_LOCK_TYPE_RENAME
,
665 &ocfs2_rename_lops
, osb
);
668 static void ocfs2_nfs_sync_lock_res_init(struct ocfs2_lock_res
*res
,
669 struct ocfs2_super
*osb
)
671 /* nfs_sync lockres doesn't come from a slab so we call init
672 * once on it manually. */
673 ocfs2_lock_res_init_once(res
);
674 ocfs2_build_lock_name(OCFS2_LOCK_TYPE_NFS_SYNC
, 0, 0, res
->l_name
);
675 ocfs2_lock_res_init_common(osb
, res
, OCFS2_LOCK_TYPE_NFS_SYNC
,
676 &ocfs2_nfs_sync_lops
, osb
);
679 static void ocfs2_orphan_scan_lock_res_init(struct ocfs2_lock_res
*res
,
680 struct ocfs2_super
*osb
)
682 ocfs2_lock_res_init_once(res
);
683 ocfs2_build_lock_name(OCFS2_LOCK_TYPE_ORPHAN_SCAN
, 0, 0, res
->l_name
);
684 ocfs2_lock_res_init_common(osb
, res
, OCFS2_LOCK_TYPE_ORPHAN_SCAN
,
685 &ocfs2_orphan_scan_lops
, osb
);
688 void ocfs2_file_lock_res_init(struct ocfs2_lock_res
*lockres
,
689 struct ocfs2_file_private
*fp
)
691 struct inode
*inode
= fp
->fp_file
->f_mapping
->host
;
692 struct ocfs2_inode_info
*oi
= OCFS2_I(inode
);
694 ocfs2_lock_res_init_once(lockres
);
695 ocfs2_build_lock_name(OCFS2_LOCK_TYPE_FLOCK
, oi
->ip_blkno
,
696 inode
->i_generation
, lockres
->l_name
);
697 ocfs2_lock_res_init_common(OCFS2_SB(inode
->i_sb
), lockres
,
698 OCFS2_LOCK_TYPE_FLOCK
, &ocfs2_flock_lops
,
700 lockres
->l_flags
|= OCFS2_LOCK_NOCACHE
;
703 void ocfs2_qinfo_lock_res_init(struct ocfs2_lock_res
*lockres
,
704 struct ocfs2_mem_dqinfo
*info
)
706 ocfs2_lock_res_init_once(lockres
);
707 ocfs2_build_lock_name(OCFS2_LOCK_TYPE_QINFO
, info
->dqi_gi
.dqi_type
,
709 ocfs2_lock_res_init_common(OCFS2_SB(info
->dqi_gi
.dqi_sb
), lockres
,
710 OCFS2_LOCK_TYPE_QINFO
, &ocfs2_qinfo_lops
,
714 void ocfs2_refcount_lock_res_init(struct ocfs2_lock_res
*lockres
,
715 struct ocfs2_super
*osb
, u64 ref_blkno
,
716 unsigned int generation
)
718 ocfs2_lock_res_init_once(lockres
);
719 ocfs2_build_lock_name(OCFS2_LOCK_TYPE_REFCOUNT
, ref_blkno
,
720 generation
, lockres
->l_name
);
721 ocfs2_lock_res_init_common(osb
, lockres
, OCFS2_LOCK_TYPE_REFCOUNT
,
722 &ocfs2_refcount_block_lops
, osb
);
725 void ocfs2_lock_res_free(struct ocfs2_lock_res
*res
)
729 if (!(res
->l_flags
& OCFS2_LOCK_INITIALIZED
))
732 ocfs2_remove_lockres_tracking(res
);
734 mlog_bug_on_msg(!list_empty(&res
->l_blocked_list
),
735 "Lockres %s is on the blocked list\n",
737 mlog_bug_on_msg(!list_empty(&res
->l_mask_waiters
),
738 "Lockres %s has mask waiters pending\n",
740 mlog_bug_on_msg(spin_is_locked(&res
->l_lock
),
741 "Lockres %s is locked\n",
743 mlog_bug_on_msg(res
->l_ro_holders
,
744 "Lockres %s has %u ro holders\n",
745 res
->l_name
, res
->l_ro_holders
);
746 mlog_bug_on_msg(res
->l_ex_holders
,
747 "Lockres %s has %u ex holders\n",
748 res
->l_name
, res
->l_ex_holders
);
750 /* Need to clear out the lock status block for the dlm */
751 memset(&res
->l_lksb
, 0, sizeof(res
->l_lksb
));
757 static inline void ocfs2_inc_holders(struct ocfs2_lock_res
*lockres
,
766 lockres
->l_ex_holders
++;
769 lockres
->l_ro_holders
++;
778 static inline void ocfs2_dec_holders(struct ocfs2_lock_res
*lockres
,
787 BUG_ON(!lockres
->l_ex_holders
);
788 lockres
->l_ex_holders
--;
791 BUG_ON(!lockres
->l_ro_holders
);
792 lockres
->l_ro_holders
--;
800 /* WARNING: This function lives in a world where the only three lock
801 * levels are EX, PR, and NL. It *will* have to be adjusted when more
802 * lock types are added. */
803 static inline int ocfs2_highest_compat_lock_level(int level
)
805 int new_level
= DLM_LOCK_EX
;
807 if (level
== DLM_LOCK_EX
)
808 new_level
= DLM_LOCK_NL
;
809 else if (level
== DLM_LOCK_PR
)
810 new_level
= DLM_LOCK_PR
;
814 static void lockres_set_flags(struct ocfs2_lock_res
*lockres
,
815 unsigned long newflags
)
817 struct ocfs2_mask_waiter
*mw
, *tmp
;
819 assert_spin_locked(&lockres
->l_lock
);
821 lockres
->l_flags
= newflags
;
823 list_for_each_entry_safe(mw
, tmp
, &lockres
->l_mask_waiters
, mw_item
) {
824 if ((lockres
->l_flags
& mw
->mw_mask
) != mw
->mw_goal
)
827 list_del_init(&mw
->mw_item
);
829 complete(&mw
->mw_complete
);
832 static void lockres_or_flags(struct ocfs2_lock_res
*lockres
, unsigned long or)
834 lockres_set_flags(lockres
, lockres
->l_flags
| or);
836 static void lockres_clear_flags(struct ocfs2_lock_res
*lockres
,
839 lockres_set_flags(lockres
, lockres
->l_flags
& ~clear
);
842 static inline void ocfs2_generic_handle_downconvert_action(struct ocfs2_lock_res
*lockres
)
846 BUG_ON(!(lockres
->l_flags
& OCFS2_LOCK_BUSY
));
847 BUG_ON(!(lockres
->l_flags
& OCFS2_LOCK_ATTACHED
));
848 BUG_ON(!(lockres
->l_flags
& OCFS2_LOCK_BLOCKED
));
849 BUG_ON(lockres
->l_blocking
<= DLM_LOCK_NL
);
851 lockres
->l_level
= lockres
->l_requested
;
852 if (lockres
->l_level
<=
853 ocfs2_highest_compat_lock_level(lockres
->l_blocking
)) {
854 lockres
->l_blocking
= DLM_LOCK_NL
;
855 lockres_clear_flags(lockres
, OCFS2_LOCK_BLOCKED
);
857 lockres_clear_flags(lockres
, OCFS2_LOCK_BUSY
);
862 static inline void ocfs2_generic_handle_convert_action(struct ocfs2_lock_res
*lockres
)
866 BUG_ON(!(lockres
->l_flags
& OCFS2_LOCK_BUSY
));
867 BUG_ON(!(lockres
->l_flags
& OCFS2_LOCK_ATTACHED
));
869 /* Convert from RO to EX doesn't really need anything as our
870 * information is already up to data. Convert from NL to
871 * *anything* however should mark ourselves as needing an
873 if (lockres
->l_level
== DLM_LOCK_NL
&&
874 lockres
->l_ops
->flags
& LOCK_TYPE_REQUIRES_REFRESH
)
875 lockres_or_flags(lockres
, OCFS2_LOCK_NEEDS_REFRESH
);
877 lockres
->l_level
= lockres
->l_requested
;
878 lockres_clear_flags(lockres
, OCFS2_LOCK_BUSY
);
883 static inline void ocfs2_generic_handle_attach_action(struct ocfs2_lock_res
*lockres
)
887 BUG_ON((!(lockres
->l_flags
& OCFS2_LOCK_BUSY
)));
888 BUG_ON(lockres
->l_flags
& OCFS2_LOCK_ATTACHED
);
890 if (lockres
->l_requested
> DLM_LOCK_NL
&&
891 !(lockres
->l_flags
& OCFS2_LOCK_LOCAL
) &&
892 lockres
->l_ops
->flags
& LOCK_TYPE_REQUIRES_REFRESH
)
893 lockres_or_flags(lockres
, OCFS2_LOCK_NEEDS_REFRESH
);
895 lockres
->l_level
= lockres
->l_requested
;
896 lockres_or_flags(lockres
, OCFS2_LOCK_ATTACHED
);
897 lockres_clear_flags(lockres
, OCFS2_LOCK_BUSY
);
902 static int ocfs2_generic_handle_bast(struct ocfs2_lock_res
*lockres
,
905 int needs_downconvert
= 0;
908 assert_spin_locked(&lockres
->l_lock
);
910 lockres_or_flags(lockres
, OCFS2_LOCK_BLOCKED
);
912 if (level
> lockres
->l_blocking
) {
913 /* only schedule a downconvert if we haven't already scheduled
914 * one that goes low enough to satisfy the level we're
915 * blocking. this also catches the case where we get
917 if (ocfs2_highest_compat_lock_level(level
) <
918 ocfs2_highest_compat_lock_level(lockres
->l_blocking
))
919 needs_downconvert
= 1;
921 lockres
->l_blocking
= level
;
924 mlog_exit(needs_downconvert
);
925 return needs_downconvert
;
929 * OCFS2_LOCK_PENDING and l_pending_gen.
931 * Why does OCFS2_LOCK_PENDING exist? To close a race between setting
932 * OCFS2_LOCK_BUSY and calling ocfs2_dlm_lock(). See ocfs2_unblock_lock()
933 * for more details on the race.
935 * OCFS2_LOCK_PENDING closes the race quite nicely. However, it introduces
936 * a race on itself. In o2dlm, we can get the ast before ocfs2_dlm_lock()
937 * returns. The ast clears OCFS2_LOCK_BUSY, and must therefore clear
938 * OCFS2_LOCK_PENDING at the same time. When ocfs2_dlm_lock() returns,
939 * the caller is going to try to clear PENDING again. If nothing else is
940 * happening, __lockres_clear_pending() sees PENDING is unset and does
943 * But what if another path (eg downconvert thread) has just started a
944 * new locking action? The other path has re-set PENDING. Our path
945 * cannot clear PENDING, because that will re-open the original race
951 * ocfs2_cluster_lock()
956 * ocfs2_locking_ast() ocfs2_downconvert_thread()
957 * clear PENDING ocfs2_unblock_lock()
960 * ocfs2_prepare_downconvert()
970 * So as you can see, we now have a window where l_lock is not held,
971 * PENDING is not set, and ocfs2_dlm_lock() has not been called.
973 * The core problem is that ocfs2_cluster_lock() has cleared the PENDING
974 * set by ocfs2_prepare_downconvert(). That wasn't nice.
976 * To solve this we introduce l_pending_gen. A call to
977 * lockres_clear_pending() will only do so when it is passed a generation
978 * number that matches the lockres. lockres_set_pending() will return the
979 * current generation number. When ocfs2_cluster_lock() goes to clear
980 * PENDING, it passes the generation it got from set_pending(). In our
981 * example above, the generation numbers will *not* match. Thus,
982 * ocfs2_cluster_lock() will not clear the PENDING set by
983 * ocfs2_prepare_downconvert().
986 /* Unlocked version for ocfs2_locking_ast() */
987 static void __lockres_clear_pending(struct ocfs2_lock_res
*lockres
,
988 unsigned int generation
,
989 struct ocfs2_super
*osb
)
991 assert_spin_locked(&lockres
->l_lock
);
994 * The ast and locking functions can race us here. The winner
995 * will clear pending, the loser will not.
997 if (!(lockres
->l_flags
& OCFS2_LOCK_PENDING
) ||
998 (lockres
->l_pending_gen
!= generation
))
1001 lockres_clear_flags(lockres
, OCFS2_LOCK_PENDING
);
1002 lockres
->l_pending_gen
++;
1005 * The downconvert thread may have skipped us because we
1006 * were PENDING. Wake it up.
1008 if (lockres
->l_flags
& OCFS2_LOCK_BLOCKED
)
1009 ocfs2_wake_downconvert_thread(osb
);
1012 /* Locked version for callers of ocfs2_dlm_lock() */
1013 static void lockres_clear_pending(struct ocfs2_lock_res
*lockres
,
1014 unsigned int generation
,
1015 struct ocfs2_super
*osb
)
1017 unsigned long flags
;
1019 spin_lock_irqsave(&lockres
->l_lock
, flags
);
1020 __lockres_clear_pending(lockres
, generation
, osb
);
1021 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
1024 static unsigned int lockres_set_pending(struct ocfs2_lock_res
*lockres
)
1026 assert_spin_locked(&lockres
->l_lock
);
1027 BUG_ON(!(lockres
->l_flags
& OCFS2_LOCK_BUSY
));
1029 lockres_or_flags(lockres
, OCFS2_LOCK_PENDING
);
1031 return lockres
->l_pending_gen
;
1035 static void ocfs2_blocking_ast(void *opaque
, int level
)
1037 struct ocfs2_lock_res
*lockres
= opaque
;
1038 struct ocfs2_super
*osb
= ocfs2_get_lockres_osb(lockres
);
1039 int needs_downconvert
;
1040 unsigned long flags
;
1042 BUG_ON(level
<= DLM_LOCK_NL
);
1044 mlog(0, "BAST fired for lockres %s, blocking %d, level %d type %s\n",
1045 lockres
->l_name
, level
, lockres
->l_level
,
1046 ocfs2_lock_type_string(lockres
->l_type
));
1049 * We can skip the bast for locks which don't enable caching -
1050 * they'll be dropped at the earliest possible time anyway.
1052 if (lockres
->l_flags
& OCFS2_LOCK_NOCACHE
)
1055 spin_lock_irqsave(&lockres
->l_lock
, flags
);
1056 needs_downconvert
= ocfs2_generic_handle_bast(lockres
, level
);
1057 if (needs_downconvert
)
1058 ocfs2_schedule_blocked_lock(osb
, lockres
);
1059 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
1061 wake_up(&lockres
->l_event
);
1063 ocfs2_wake_downconvert_thread(osb
);
1066 static void ocfs2_locking_ast(void *opaque
)
1068 struct ocfs2_lock_res
*lockres
= opaque
;
1069 struct ocfs2_super
*osb
= ocfs2_get_lockres_osb(lockres
);
1070 unsigned long flags
;
1073 spin_lock_irqsave(&lockres
->l_lock
, flags
);
1075 status
= ocfs2_dlm_lock_status(&lockres
->l_lksb
);
1077 if (status
== -EAGAIN
) {
1078 lockres_clear_flags(lockres
, OCFS2_LOCK_BUSY
);
1083 mlog(ML_ERROR
, "lockres %s: lksb status value of %d!\n",
1084 lockres
->l_name
, status
);
1085 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
1089 switch(lockres
->l_action
) {
1090 case OCFS2_AST_ATTACH
:
1091 ocfs2_generic_handle_attach_action(lockres
);
1092 lockres_clear_flags(lockres
, OCFS2_LOCK_LOCAL
);
1094 case OCFS2_AST_CONVERT
:
1095 ocfs2_generic_handle_convert_action(lockres
);
1097 case OCFS2_AST_DOWNCONVERT
:
1098 ocfs2_generic_handle_downconvert_action(lockres
);
1101 mlog(ML_ERROR
, "lockres %s: ast fired with invalid action: %u "
1102 "lockres flags = 0x%lx, unlock action: %u\n",
1103 lockres
->l_name
, lockres
->l_action
, lockres
->l_flags
,
1104 lockres
->l_unlock_action
);
1108 /* set it to something invalid so if we get called again we
1110 lockres
->l_action
= OCFS2_AST_INVALID
;
1112 /* Did we try to cancel this lock? Clear that state */
1113 if (lockres
->l_unlock_action
== OCFS2_UNLOCK_CANCEL_CONVERT
)
1114 lockres
->l_unlock_action
= OCFS2_UNLOCK_INVALID
;
1117 * We may have beaten the locking functions here. We certainly
1118 * know that dlm_lock() has been called :-)
1119 * Because we can't have two lock calls in flight at once, we
1120 * can use lockres->l_pending_gen.
1122 __lockres_clear_pending(lockres
, lockres
->l_pending_gen
, osb
);
1124 wake_up(&lockres
->l_event
);
1125 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
1128 static inline void ocfs2_recover_from_dlm_error(struct ocfs2_lock_res
*lockres
,
1131 unsigned long flags
;
1134 spin_lock_irqsave(&lockres
->l_lock
, flags
);
1135 lockres_clear_flags(lockres
, OCFS2_LOCK_BUSY
);
1137 lockres
->l_action
= OCFS2_AST_INVALID
;
1139 lockres
->l_unlock_action
= OCFS2_UNLOCK_INVALID
;
1140 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
1142 wake_up(&lockres
->l_event
);
1146 /* Note: If we detect another process working on the lock (i.e.,
1147 * OCFS2_LOCK_BUSY), we'll bail out returning 0. It's up to the caller
1148 * to do the right thing in that case.
1150 static int ocfs2_lock_create(struct ocfs2_super
*osb
,
1151 struct ocfs2_lock_res
*lockres
,
1156 unsigned long flags
;
1161 mlog(0, "lock %s, level = %d, flags = %u\n", lockres
->l_name
, level
,
1164 spin_lock_irqsave(&lockres
->l_lock
, flags
);
1165 if ((lockres
->l_flags
& OCFS2_LOCK_ATTACHED
) ||
1166 (lockres
->l_flags
& OCFS2_LOCK_BUSY
)) {
1167 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
1171 lockres
->l_action
= OCFS2_AST_ATTACH
;
1172 lockres
->l_requested
= level
;
1173 lockres_or_flags(lockres
, OCFS2_LOCK_BUSY
);
1174 gen
= lockres_set_pending(lockres
);
1175 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
1177 ret
= ocfs2_dlm_lock(osb
->cconn
,
1182 OCFS2_LOCK_ID_MAX_LEN
- 1,
1184 lockres_clear_pending(lockres
, gen
, osb
);
1186 ocfs2_log_dlm_error("ocfs2_dlm_lock", ret
, lockres
);
1187 ocfs2_recover_from_dlm_error(lockres
, 1);
1190 mlog(0, "lock %s, return from ocfs2_dlm_lock\n", lockres
->l_name
);
1197 static inline int ocfs2_check_wait_flag(struct ocfs2_lock_res
*lockres
,
1200 unsigned long flags
;
1203 spin_lock_irqsave(&lockres
->l_lock
, flags
);
1204 ret
= lockres
->l_flags
& flag
;
1205 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
1210 static inline void ocfs2_wait_on_busy_lock(struct ocfs2_lock_res
*lockres
)
1213 wait_event(lockres
->l_event
,
1214 !ocfs2_check_wait_flag(lockres
, OCFS2_LOCK_BUSY
));
1217 static inline void ocfs2_wait_on_refreshing_lock(struct ocfs2_lock_res
*lockres
)
1220 wait_event(lockres
->l_event
,
1221 !ocfs2_check_wait_flag(lockres
, OCFS2_LOCK_REFRESHING
));
1224 /* predict what lock level we'll be dropping down to on behalf
1225 * of another node, and return true if the currently wanted
1226 * level will be compatible with it. */
1227 static inline int ocfs2_may_continue_on_blocked_lock(struct ocfs2_lock_res
*lockres
,
1230 BUG_ON(!(lockres
->l_flags
& OCFS2_LOCK_BLOCKED
));
1232 return wanted
<= ocfs2_highest_compat_lock_level(lockres
->l_blocking
);
1235 static void ocfs2_init_mask_waiter(struct ocfs2_mask_waiter
*mw
)
1237 INIT_LIST_HEAD(&mw
->mw_item
);
1238 init_completion(&mw
->mw_complete
);
1239 ocfs2_init_start_time(mw
);
1242 static int ocfs2_wait_for_mask(struct ocfs2_mask_waiter
*mw
)
1244 wait_for_completion(&mw
->mw_complete
);
1245 /* Re-arm the completion in case we want to wait on it again */
1246 INIT_COMPLETION(mw
->mw_complete
);
1247 return mw
->mw_status
;
1250 static void lockres_add_mask_waiter(struct ocfs2_lock_res
*lockres
,
1251 struct ocfs2_mask_waiter
*mw
,
1255 BUG_ON(!list_empty(&mw
->mw_item
));
1257 assert_spin_locked(&lockres
->l_lock
);
1259 list_add_tail(&mw
->mw_item
, &lockres
->l_mask_waiters
);
1264 /* returns 0 if the mw that was removed was already satisfied, -EBUSY
1265 * if the mask still hadn't reached its goal */
1266 static int lockres_remove_mask_waiter(struct ocfs2_lock_res
*lockres
,
1267 struct ocfs2_mask_waiter
*mw
)
1269 unsigned long flags
;
1272 spin_lock_irqsave(&lockres
->l_lock
, flags
);
1273 if (!list_empty(&mw
->mw_item
)) {
1274 if ((lockres
->l_flags
& mw
->mw_mask
) != mw
->mw_goal
)
1277 list_del_init(&mw
->mw_item
);
1278 init_completion(&mw
->mw_complete
);
1280 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
1286 static int ocfs2_wait_for_mask_interruptible(struct ocfs2_mask_waiter
*mw
,
1287 struct ocfs2_lock_res
*lockres
)
1291 ret
= wait_for_completion_interruptible(&mw
->mw_complete
);
1293 lockres_remove_mask_waiter(lockres
, mw
);
1295 ret
= mw
->mw_status
;
1296 /* Re-arm the completion in case we want to wait on it again */
1297 INIT_COMPLETION(mw
->mw_complete
);
1301 static int __ocfs2_cluster_lock(struct ocfs2_super
*osb
,
1302 struct ocfs2_lock_res
*lockres
,
1307 unsigned long caller_ip
)
1309 struct ocfs2_mask_waiter mw
;
1310 int wait
, catch_signals
= !(osb
->s_mount_opt
& OCFS2_MOUNT_NOINTR
);
1311 int ret
= 0; /* gcc doesn't realize wait = 1 guarantees ret is set */
1312 unsigned long flags
;
1314 int noqueue_attempted
= 0;
1318 ocfs2_init_mask_waiter(&mw
);
1320 if (lockres
->l_ops
->flags
& LOCK_TYPE_USES_LVB
)
1321 lkm_flags
|= DLM_LKF_VALBLK
;
1326 if (catch_signals
&& signal_pending(current
)) {
1331 spin_lock_irqsave(&lockres
->l_lock
, flags
);
1333 mlog_bug_on_msg(lockres
->l_flags
& OCFS2_LOCK_FREEING
,
1334 "Cluster lock called on freeing lockres %s! flags "
1335 "0x%lx\n", lockres
->l_name
, lockres
->l_flags
);
1337 /* We only compare against the currently granted level
1338 * here. If the lock is blocked waiting on a downconvert,
1339 * we'll get caught below. */
1340 if (lockres
->l_flags
& OCFS2_LOCK_BUSY
&&
1341 level
> lockres
->l_level
) {
1342 /* is someone sitting in dlm_lock? If so, wait on
1344 lockres_add_mask_waiter(lockres
, &mw
, OCFS2_LOCK_BUSY
, 0);
1349 if (lockres
->l_flags
& OCFS2_LOCK_BLOCKED
&&
1350 !ocfs2_may_continue_on_blocked_lock(lockres
, level
)) {
1351 /* is the lock is currently blocked on behalf of
1353 lockres_add_mask_waiter(lockres
, &mw
, OCFS2_LOCK_BLOCKED
, 0);
1358 if (level
> lockres
->l_level
) {
1359 if (noqueue_attempted
> 0) {
1363 if (lkm_flags
& DLM_LKF_NOQUEUE
)
1364 noqueue_attempted
= 1;
1366 if (lockres
->l_action
!= OCFS2_AST_INVALID
)
1367 mlog(ML_ERROR
, "lockres %s has action %u pending\n",
1368 lockres
->l_name
, lockres
->l_action
);
1370 if (!(lockres
->l_flags
& OCFS2_LOCK_ATTACHED
)) {
1371 lockres
->l_action
= OCFS2_AST_ATTACH
;
1372 lkm_flags
&= ~DLM_LKF_CONVERT
;
1374 lockres
->l_action
= OCFS2_AST_CONVERT
;
1375 lkm_flags
|= DLM_LKF_CONVERT
;
1378 lockres
->l_requested
= level
;
1379 lockres_or_flags(lockres
, OCFS2_LOCK_BUSY
);
1380 gen
= lockres_set_pending(lockres
);
1381 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
1383 BUG_ON(level
== DLM_LOCK_IV
);
1384 BUG_ON(level
== DLM_LOCK_NL
);
1386 mlog(0, "lock %s, convert from %d to level = %d\n",
1387 lockres
->l_name
, lockres
->l_level
, level
);
1389 /* call dlm_lock to upgrade lock now */
1390 ret
= ocfs2_dlm_lock(osb
->cconn
,
1395 OCFS2_LOCK_ID_MAX_LEN
- 1,
1397 lockres_clear_pending(lockres
, gen
, osb
);
1399 if (!(lkm_flags
& DLM_LKF_NOQUEUE
) ||
1401 ocfs2_log_dlm_error("ocfs2_dlm_lock",
1404 ocfs2_recover_from_dlm_error(lockres
, 1);
1408 mlog(0, "lock %s, successful return from ocfs2_dlm_lock\n",
1411 /* At this point we've gone inside the dlm and need to
1412 * complete our work regardless. */
1415 /* wait for busy to clear and carry on */
1419 /* Ok, if we get here then we're good to go. */
1420 ocfs2_inc_holders(lockres
, level
);
1424 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
1427 * This is helping work around a lock inversion between the page lock
1428 * and dlm locks. One path holds the page lock while calling aops
1429 * which block acquiring dlm locks. The voting thread holds dlm
1430 * locks while acquiring page locks while down converting data locks.
1431 * This block is helping an aop path notice the inversion and back
1432 * off to unlock its page lock before trying the dlm lock again.
1434 if (wait
&& arg_flags
& OCFS2_LOCK_NONBLOCK
&&
1435 mw
.mw_mask
& (OCFS2_LOCK_BUSY
|OCFS2_LOCK_BLOCKED
)) {
1437 if (lockres_remove_mask_waiter(lockres
, &mw
))
1443 ret
= ocfs2_wait_for_mask(&mw
);
1448 ocfs2_update_lock_stats(lockres
, level
, &mw
, ret
);
1450 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1451 if (!ret
&& lockres
->l_lockdep_map
.key
!= NULL
) {
1452 if (level
== DLM_LOCK_PR
)
1453 rwsem_acquire_read(&lockres
->l_lockdep_map
, l_subclass
,
1454 !!(arg_flags
& OCFS2_META_LOCK_NOQUEUE
),
1457 rwsem_acquire(&lockres
->l_lockdep_map
, l_subclass
,
1458 !!(arg_flags
& OCFS2_META_LOCK_NOQUEUE
),
1466 static inline int ocfs2_cluster_lock(struct ocfs2_super
*osb
,
1467 struct ocfs2_lock_res
*lockres
,
1472 return __ocfs2_cluster_lock(osb
, lockres
, level
, lkm_flags
, arg_flags
,
1477 static void __ocfs2_cluster_unlock(struct ocfs2_super
*osb
,
1478 struct ocfs2_lock_res
*lockres
,
1480 unsigned long caller_ip
)
1482 unsigned long flags
;
1485 spin_lock_irqsave(&lockres
->l_lock
, flags
);
1486 ocfs2_dec_holders(lockres
, level
);
1487 ocfs2_downconvert_on_unlock(osb
, lockres
);
1488 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
1489 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1490 if (lockres
->l_lockdep_map
.key
!= NULL
)
1491 rwsem_release(&lockres
->l_lockdep_map
, 1, caller_ip
);
1496 static int ocfs2_create_new_lock(struct ocfs2_super
*osb
,
1497 struct ocfs2_lock_res
*lockres
,
1501 int level
= ex
? DLM_LOCK_EX
: DLM_LOCK_PR
;
1502 unsigned long flags
;
1503 u32 lkm_flags
= local
? DLM_LKF_LOCAL
: 0;
1505 spin_lock_irqsave(&lockres
->l_lock
, flags
);
1506 BUG_ON(lockres
->l_flags
& OCFS2_LOCK_ATTACHED
);
1507 lockres_or_flags(lockres
, OCFS2_LOCK_LOCAL
);
1508 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
1510 return ocfs2_lock_create(osb
, lockres
, level
, lkm_flags
);
1513 /* Grants us an EX lock on the data and metadata resources, skipping
1514 * the normal cluster directory lookup. Use this ONLY on newly created
1515 * inodes which other nodes can't possibly see, and which haven't been
1516 * hashed in the inode hash yet. This can give us a good performance
1517 * increase as it'll skip the network broadcast normally associated
1518 * with creating a new lock resource. */
1519 int ocfs2_create_new_inode_locks(struct inode
*inode
)
1522 struct ocfs2_super
*osb
= OCFS2_SB(inode
->i_sb
);
1525 BUG_ON(!ocfs2_inode_is_new(inode
));
1529 mlog(0, "Inode %llu\n", (unsigned long long)OCFS2_I(inode
)->ip_blkno
);
1531 /* NOTE: That we don't increment any of the holder counts, nor
1532 * do we add anything to a journal handle. Since this is
1533 * supposed to be a new inode which the cluster doesn't know
1534 * about yet, there is no need to. As far as the LVB handling
1535 * is concerned, this is basically like acquiring an EX lock
1536 * on a resource which has an invalid one -- we'll set it
1537 * valid when we release the EX. */
1539 ret
= ocfs2_create_new_lock(osb
, &OCFS2_I(inode
)->ip_rw_lockres
, 1, 1);
1546 * We don't want to use DLM_LKF_LOCAL on a meta data lock as they
1547 * don't use a generation in their lock names.
1549 ret
= ocfs2_create_new_lock(osb
, &OCFS2_I(inode
)->ip_inode_lockres
, 1, 0);
1555 ret
= ocfs2_create_new_lock(osb
, &OCFS2_I(inode
)->ip_open_lockres
, 0, 0);
1566 int ocfs2_rw_lock(struct inode
*inode
, int write
)
1569 struct ocfs2_lock_res
*lockres
;
1570 struct ocfs2_super
*osb
= OCFS2_SB(inode
->i_sb
);
1576 mlog(0, "inode %llu take %s RW lock\n",
1577 (unsigned long long)OCFS2_I(inode
)->ip_blkno
,
1578 write
? "EXMODE" : "PRMODE");
1580 if (ocfs2_mount_local(osb
))
1583 lockres
= &OCFS2_I(inode
)->ip_rw_lockres
;
1585 level
= write
? DLM_LOCK_EX
: DLM_LOCK_PR
;
1587 status
= ocfs2_cluster_lock(OCFS2_SB(inode
->i_sb
), lockres
, level
, 0,
1596 void ocfs2_rw_unlock(struct inode
*inode
, int write
)
1598 int level
= write
? DLM_LOCK_EX
: DLM_LOCK_PR
;
1599 struct ocfs2_lock_res
*lockres
= &OCFS2_I(inode
)->ip_rw_lockres
;
1600 struct ocfs2_super
*osb
= OCFS2_SB(inode
->i_sb
);
1604 mlog(0, "inode %llu drop %s RW lock\n",
1605 (unsigned long long)OCFS2_I(inode
)->ip_blkno
,
1606 write
? "EXMODE" : "PRMODE");
1608 if (!ocfs2_mount_local(osb
))
1609 ocfs2_cluster_unlock(OCFS2_SB(inode
->i_sb
), lockres
, level
);
1615 * ocfs2_open_lock always get PR mode lock.
1617 int ocfs2_open_lock(struct inode
*inode
)
1620 struct ocfs2_lock_res
*lockres
;
1621 struct ocfs2_super
*osb
= OCFS2_SB(inode
->i_sb
);
1627 mlog(0, "inode %llu take PRMODE open lock\n",
1628 (unsigned long long)OCFS2_I(inode
)->ip_blkno
);
1630 if (ocfs2_mount_local(osb
))
1633 lockres
= &OCFS2_I(inode
)->ip_open_lockres
;
1635 status
= ocfs2_cluster_lock(OCFS2_SB(inode
->i_sb
), lockres
,
1645 int ocfs2_try_open_lock(struct inode
*inode
, int write
)
1647 int status
= 0, level
;
1648 struct ocfs2_lock_res
*lockres
;
1649 struct ocfs2_super
*osb
= OCFS2_SB(inode
->i_sb
);
1655 mlog(0, "inode %llu try to take %s open lock\n",
1656 (unsigned long long)OCFS2_I(inode
)->ip_blkno
,
1657 write
? "EXMODE" : "PRMODE");
1659 if (ocfs2_mount_local(osb
))
1662 lockres
= &OCFS2_I(inode
)->ip_open_lockres
;
1664 level
= write
? DLM_LOCK_EX
: DLM_LOCK_PR
;
1667 * The file system may already holding a PRMODE/EXMODE open lock.
1668 * Since we pass DLM_LKF_NOQUEUE, the request won't block waiting on
1669 * other nodes and the -EAGAIN will indicate to the caller that
1670 * this inode is still in use.
1672 status
= ocfs2_cluster_lock(OCFS2_SB(inode
->i_sb
), lockres
,
1673 level
, DLM_LKF_NOQUEUE
, 0);
1681 * ocfs2_open_unlock unlock PR and EX mode open locks.
1683 void ocfs2_open_unlock(struct inode
*inode
)
1685 struct ocfs2_lock_res
*lockres
= &OCFS2_I(inode
)->ip_open_lockres
;
1686 struct ocfs2_super
*osb
= OCFS2_SB(inode
->i_sb
);
1690 mlog(0, "inode %llu drop open lock\n",
1691 (unsigned long long)OCFS2_I(inode
)->ip_blkno
);
1693 if (ocfs2_mount_local(osb
))
1696 if(lockres
->l_ro_holders
)
1697 ocfs2_cluster_unlock(OCFS2_SB(inode
->i_sb
), lockres
,
1699 if(lockres
->l_ex_holders
)
1700 ocfs2_cluster_unlock(OCFS2_SB(inode
->i_sb
), lockres
,
1707 static int ocfs2_flock_handle_signal(struct ocfs2_lock_res
*lockres
,
1711 struct ocfs2_super
*osb
= ocfs2_get_lockres_osb(lockres
);
1712 unsigned long flags
;
1713 struct ocfs2_mask_waiter mw
;
1715 ocfs2_init_mask_waiter(&mw
);
1718 spin_lock_irqsave(&lockres
->l_lock
, flags
);
1719 if (lockres
->l_flags
& OCFS2_LOCK_BUSY
) {
1720 ret
= ocfs2_prepare_cancel_convert(osb
, lockres
);
1722 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
1723 ret
= ocfs2_cancel_convert(osb
, lockres
);
1730 lockres_add_mask_waiter(lockres
, &mw
, OCFS2_LOCK_BUSY
, 0);
1731 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
1733 ocfs2_wait_for_mask(&mw
);
1739 * We may still have gotten the lock, in which case there's no
1740 * point to restarting the syscall.
1742 if (lockres
->l_level
== level
)
1745 mlog(0, "Cancel returning %d. flags: 0x%lx, level: %d, act: %d\n", ret
,
1746 lockres
->l_flags
, lockres
->l_level
, lockres
->l_action
);
1748 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
1755 * ocfs2_file_lock() and ocfs2_file_unlock() map to a single pair of
1756 * flock() calls. The locking approach this requires is sufficiently
1757 * different from all other cluster lock types that we implement a
1758 * seperate path to the "low-level" dlm calls. In particular:
1760 * - No optimization of lock levels is done - we take at exactly
1761 * what's been requested.
1763 * - No lock caching is employed. We immediately downconvert to
1764 * no-lock at unlock time. This also means flock locks never go on
1765 * the blocking list).
1767 * - Since userspace can trivially deadlock itself with flock, we make
1768 * sure to allow cancellation of a misbehaving applications flock()
1771 * - Access to any flock lockres doesn't require concurrency, so we
1772 * can simplify the code by requiring the caller to guarantee
1773 * serialization of dlmglue flock calls.
1775 int ocfs2_file_lock(struct file
*file
, int ex
, int trylock
)
1777 int ret
, level
= ex
? DLM_LOCK_EX
: DLM_LOCK_PR
;
1778 unsigned int lkm_flags
= trylock
? DLM_LKF_NOQUEUE
: 0;
1779 unsigned long flags
;
1780 struct ocfs2_file_private
*fp
= file
->private_data
;
1781 struct ocfs2_lock_res
*lockres
= &fp
->fp_flock
;
1782 struct ocfs2_super
*osb
= OCFS2_SB(file
->f_mapping
->host
->i_sb
);
1783 struct ocfs2_mask_waiter mw
;
1785 ocfs2_init_mask_waiter(&mw
);
1787 if ((lockres
->l_flags
& OCFS2_LOCK_BUSY
) ||
1788 (lockres
->l_level
> DLM_LOCK_NL
)) {
1790 "File lock \"%s\" has busy or locked state: flags: 0x%lx, "
1791 "level: %u\n", lockres
->l_name
, lockres
->l_flags
,
1796 spin_lock_irqsave(&lockres
->l_lock
, flags
);
1797 if (!(lockres
->l_flags
& OCFS2_LOCK_ATTACHED
)) {
1798 lockres_add_mask_waiter(lockres
, &mw
, OCFS2_LOCK_BUSY
, 0);
1799 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
1802 * Get the lock at NLMODE to start - that way we
1803 * can cancel the upconvert request if need be.
1805 ret
= ocfs2_lock_create(osb
, lockres
, DLM_LOCK_NL
, 0);
1811 ret
= ocfs2_wait_for_mask(&mw
);
1816 spin_lock_irqsave(&lockres
->l_lock
, flags
);
1819 lockres
->l_action
= OCFS2_AST_CONVERT
;
1820 lkm_flags
|= DLM_LKF_CONVERT
;
1821 lockres
->l_requested
= level
;
1822 lockres_or_flags(lockres
, OCFS2_LOCK_BUSY
);
1824 lockres_add_mask_waiter(lockres
, &mw
, OCFS2_LOCK_BUSY
, 0);
1825 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
1827 ret
= ocfs2_dlm_lock(osb
->cconn
, level
, &lockres
->l_lksb
, lkm_flags
,
1828 lockres
->l_name
, OCFS2_LOCK_ID_MAX_LEN
- 1,
1831 if (!trylock
|| (ret
!= -EAGAIN
)) {
1832 ocfs2_log_dlm_error("ocfs2_dlm_lock", ret
, lockres
);
1836 ocfs2_recover_from_dlm_error(lockres
, 1);
1837 lockres_remove_mask_waiter(lockres
, &mw
);
1841 ret
= ocfs2_wait_for_mask_interruptible(&mw
, lockres
);
1842 if (ret
== -ERESTARTSYS
) {
1844 * Userspace can cause deadlock itself with
1845 * flock(). Current behavior locally is to allow the
1846 * deadlock, but abort the system call if a signal is
1847 * received. We follow this example, otherwise a
1848 * poorly written program could sit in kernel until
1851 * Handling this is a bit more complicated for Ocfs2
1852 * though. We can't exit this function with an
1853 * outstanding lock request, so a cancel convert is
1854 * required. We intentionally overwrite 'ret' - if the
1855 * cancel fails and the lock was granted, it's easier
1856 * to just bubble sucess back up to the user.
1858 ret
= ocfs2_flock_handle_signal(lockres
, level
);
1859 } else if (!ret
&& (level
> lockres
->l_level
)) {
1860 /* Trylock failed asynchronously */
1867 mlog(0, "Lock: \"%s\" ex: %d, trylock: %d, returns: %d\n",
1868 lockres
->l_name
, ex
, trylock
, ret
);
1872 void ocfs2_file_unlock(struct file
*file
)
1876 unsigned long flags
;
1877 struct ocfs2_file_private
*fp
= file
->private_data
;
1878 struct ocfs2_lock_res
*lockres
= &fp
->fp_flock
;
1879 struct ocfs2_super
*osb
= OCFS2_SB(file
->f_mapping
->host
->i_sb
);
1880 struct ocfs2_mask_waiter mw
;
1882 ocfs2_init_mask_waiter(&mw
);
1884 if (!(lockres
->l_flags
& OCFS2_LOCK_ATTACHED
))
1887 if (lockres
->l_level
== DLM_LOCK_NL
)
1890 mlog(0, "Unlock: \"%s\" flags: 0x%lx, level: %d, act: %d\n",
1891 lockres
->l_name
, lockres
->l_flags
, lockres
->l_level
,
1894 spin_lock_irqsave(&lockres
->l_lock
, flags
);
1896 * Fake a blocking ast for the downconvert code.
1898 lockres_or_flags(lockres
, OCFS2_LOCK_BLOCKED
);
1899 lockres
->l_blocking
= DLM_LOCK_EX
;
1901 gen
= ocfs2_prepare_downconvert(lockres
, DLM_LOCK_NL
);
1902 lockres_add_mask_waiter(lockres
, &mw
, OCFS2_LOCK_BUSY
, 0);
1903 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
1905 ret
= ocfs2_downconvert_lock(osb
, lockres
, DLM_LOCK_NL
, 0, gen
);
1911 ret
= ocfs2_wait_for_mask(&mw
);
1916 static void ocfs2_downconvert_on_unlock(struct ocfs2_super
*osb
,
1917 struct ocfs2_lock_res
*lockres
)
1923 /* If we know that another node is waiting on our lock, kick
1924 * the downconvert thread * pre-emptively when we reach a release
1926 if (lockres
->l_flags
& OCFS2_LOCK_BLOCKED
) {
1927 switch(lockres
->l_blocking
) {
1929 if (!lockres
->l_ex_holders
&& !lockres
->l_ro_holders
)
1933 if (!lockres
->l_ex_holders
)
1942 ocfs2_wake_downconvert_thread(osb
);
1947 #define OCFS2_SEC_BITS 34
1948 #define OCFS2_SEC_SHIFT (64 - 34)
1949 #define OCFS2_NSEC_MASK ((1ULL << OCFS2_SEC_SHIFT) - 1)
1951 /* LVB only has room for 64 bits of time here so we pack it for
1953 static u64
ocfs2_pack_timespec(struct timespec
*spec
)
1956 u64 sec
= spec
->tv_sec
;
1957 u32 nsec
= spec
->tv_nsec
;
1959 res
= (sec
<< OCFS2_SEC_SHIFT
) | (nsec
& OCFS2_NSEC_MASK
);
1964 /* Call this with the lockres locked. I am reasonably sure we don't
1965 * need ip_lock in this function as anyone who would be changing those
1966 * values is supposed to be blocked in ocfs2_inode_lock right now. */
1967 static void __ocfs2_stuff_meta_lvb(struct inode
*inode
)
1969 struct ocfs2_inode_info
*oi
= OCFS2_I(inode
);
1970 struct ocfs2_lock_res
*lockres
= &oi
->ip_inode_lockres
;
1971 struct ocfs2_meta_lvb
*lvb
;
1975 lvb
= ocfs2_dlm_lvb(&lockres
->l_lksb
);
1978 * Invalidate the LVB of a deleted inode - this way other
1979 * nodes are forced to go to disk and discover the new inode
1982 if (oi
->ip_flags
& OCFS2_INODE_DELETED
) {
1983 lvb
->lvb_version
= 0;
1987 lvb
->lvb_version
= OCFS2_LVB_VERSION
;
1988 lvb
->lvb_isize
= cpu_to_be64(i_size_read(inode
));
1989 lvb
->lvb_iclusters
= cpu_to_be32(oi
->ip_clusters
);
1990 lvb
->lvb_iuid
= cpu_to_be32(inode
->i_uid
);
1991 lvb
->lvb_igid
= cpu_to_be32(inode
->i_gid
);
1992 lvb
->lvb_imode
= cpu_to_be16(inode
->i_mode
);
1993 lvb
->lvb_inlink
= cpu_to_be16(inode
->i_nlink
);
1994 lvb
->lvb_iatime_packed
=
1995 cpu_to_be64(ocfs2_pack_timespec(&inode
->i_atime
));
1996 lvb
->lvb_ictime_packed
=
1997 cpu_to_be64(ocfs2_pack_timespec(&inode
->i_ctime
));
1998 lvb
->lvb_imtime_packed
=
1999 cpu_to_be64(ocfs2_pack_timespec(&inode
->i_mtime
));
2000 lvb
->lvb_iattr
= cpu_to_be32(oi
->ip_attr
);
2001 lvb
->lvb_idynfeatures
= cpu_to_be16(oi
->ip_dyn_features
);
2002 lvb
->lvb_igeneration
= cpu_to_be32(inode
->i_generation
);
2005 mlog_meta_lvb(0, lockres
);
2010 static void ocfs2_unpack_timespec(struct timespec
*spec
,
2013 spec
->tv_sec
= packed_time
>> OCFS2_SEC_SHIFT
;
2014 spec
->tv_nsec
= packed_time
& OCFS2_NSEC_MASK
;
2017 static void ocfs2_refresh_inode_from_lvb(struct inode
*inode
)
2019 struct ocfs2_inode_info
*oi
= OCFS2_I(inode
);
2020 struct ocfs2_lock_res
*lockres
= &oi
->ip_inode_lockres
;
2021 struct ocfs2_meta_lvb
*lvb
;
2025 mlog_meta_lvb(0, lockres
);
2027 lvb
= ocfs2_dlm_lvb(&lockres
->l_lksb
);
2029 /* We're safe here without the lockres lock... */
2030 spin_lock(&oi
->ip_lock
);
2031 oi
->ip_clusters
= be32_to_cpu(lvb
->lvb_iclusters
);
2032 i_size_write(inode
, be64_to_cpu(lvb
->lvb_isize
));
2034 oi
->ip_attr
= be32_to_cpu(lvb
->lvb_iattr
);
2035 oi
->ip_dyn_features
= be16_to_cpu(lvb
->lvb_idynfeatures
);
2036 ocfs2_set_inode_flags(inode
);
2038 /* fast-symlinks are a special case */
2039 if (S_ISLNK(inode
->i_mode
) && !oi
->ip_clusters
)
2040 inode
->i_blocks
= 0;
2042 inode
->i_blocks
= ocfs2_inode_sector_count(inode
);
2044 inode
->i_uid
= be32_to_cpu(lvb
->lvb_iuid
);
2045 inode
->i_gid
= be32_to_cpu(lvb
->lvb_igid
);
2046 inode
->i_mode
= be16_to_cpu(lvb
->lvb_imode
);
2047 inode
->i_nlink
= be16_to_cpu(lvb
->lvb_inlink
);
2048 ocfs2_unpack_timespec(&inode
->i_atime
,
2049 be64_to_cpu(lvb
->lvb_iatime_packed
));
2050 ocfs2_unpack_timespec(&inode
->i_mtime
,
2051 be64_to_cpu(lvb
->lvb_imtime_packed
));
2052 ocfs2_unpack_timespec(&inode
->i_ctime
,
2053 be64_to_cpu(lvb
->lvb_ictime_packed
));
2054 spin_unlock(&oi
->ip_lock
);
2059 static inline int ocfs2_meta_lvb_is_trustable(struct inode
*inode
,
2060 struct ocfs2_lock_res
*lockres
)
2062 struct ocfs2_meta_lvb
*lvb
= ocfs2_dlm_lvb(&lockres
->l_lksb
);
2064 if (ocfs2_dlm_lvb_valid(&lockres
->l_lksb
)
2065 && lvb
->lvb_version
== OCFS2_LVB_VERSION
2066 && be32_to_cpu(lvb
->lvb_igeneration
) == inode
->i_generation
)
2071 /* Determine whether a lock resource needs to be refreshed, and
2072 * arbitrate who gets to refresh it.
2074 * 0 means no refresh needed.
2076 * > 0 means you need to refresh this and you MUST call
2077 * ocfs2_complete_lock_res_refresh afterwards. */
2078 static int ocfs2_should_refresh_lock_res(struct ocfs2_lock_res
*lockres
)
2080 unsigned long flags
;
2086 spin_lock_irqsave(&lockres
->l_lock
, flags
);
2087 if (!(lockres
->l_flags
& OCFS2_LOCK_NEEDS_REFRESH
)) {
2088 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
2092 if (lockres
->l_flags
& OCFS2_LOCK_REFRESHING
) {
2093 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
2095 ocfs2_wait_on_refreshing_lock(lockres
);
2099 /* Ok, I'll be the one to refresh this lock. */
2100 lockres_or_flags(lockres
, OCFS2_LOCK_REFRESHING
);
2101 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
2109 /* If status is non zero, I'll mark it as not being in refresh
2110 * anymroe, but i won't clear the needs refresh flag. */
2111 static inline void ocfs2_complete_lock_res_refresh(struct ocfs2_lock_res
*lockres
,
2114 unsigned long flags
;
2117 spin_lock_irqsave(&lockres
->l_lock
, flags
);
2118 lockres_clear_flags(lockres
, OCFS2_LOCK_REFRESHING
);
2120 lockres_clear_flags(lockres
, OCFS2_LOCK_NEEDS_REFRESH
);
2121 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
2123 wake_up(&lockres
->l_event
);
2128 /* may or may not return a bh if it went to disk. */
2129 static int ocfs2_inode_lock_update(struct inode
*inode
,
2130 struct buffer_head
**bh
)
2133 struct ocfs2_inode_info
*oi
= OCFS2_I(inode
);
2134 struct ocfs2_lock_res
*lockres
= &oi
->ip_inode_lockres
;
2135 struct ocfs2_dinode
*fe
;
2136 struct ocfs2_super
*osb
= OCFS2_SB(inode
->i_sb
);
2140 if (ocfs2_mount_local(osb
))
2143 spin_lock(&oi
->ip_lock
);
2144 if (oi
->ip_flags
& OCFS2_INODE_DELETED
) {
2145 mlog(0, "Orphaned inode %llu was deleted while we "
2146 "were waiting on a lock. ip_flags = 0x%x\n",
2147 (unsigned long long)oi
->ip_blkno
, oi
->ip_flags
);
2148 spin_unlock(&oi
->ip_lock
);
2152 spin_unlock(&oi
->ip_lock
);
2154 if (!ocfs2_should_refresh_lock_res(lockres
))
2157 /* This will discard any caching information we might have had
2158 * for the inode metadata. */
2159 ocfs2_metadata_cache_purge(INODE_CACHE(inode
));
2161 ocfs2_extent_map_trunc(inode
, 0);
2163 if (ocfs2_meta_lvb_is_trustable(inode
, lockres
)) {
2164 mlog(0, "Trusting LVB on inode %llu\n",
2165 (unsigned long long)oi
->ip_blkno
);
2166 ocfs2_refresh_inode_from_lvb(inode
);
2168 /* Boo, we have to go to disk. */
2169 /* read bh, cast, ocfs2_refresh_inode */
2170 status
= ocfs2_read_inode_block(inode
, bh
);
2175 fe
= (struct ocfs2_dinode
*) (*bh
)->b_data
;
2177 /* This is a good chance to make sure we're not
2178 * locking an invalid object. ocfs2_read_inode_block()
2179 * already checked that the inode block is sane.
2181 * We bug on a stale inode here because we checked
2182 * above whether it was wiped from disk. The wiping
2183 * node provides a guarantee that we receive that
2184 * message and can mark the inode before dropping any
2185 * locks associated with it. */
2186 mlog_bug_on_msg(inode
->i_generation
!=
2187 le32_to_cpu(fe
->i_generation
),
2188 "Invalid dinode %llu disk generation: %u "
2189 "inode->i_generation: %u\n",
2190 (unsigned long long)oi
->ip_blkno
,
2191 le32_to_cpu(fe
->i_generation
),
2192 inode
->i_generation
);
2193 mlog_bug_on_msg(le64_to_cpu(fe
->i_dtime
) ||
2194 !(fe
->i_flags
& cpu_to_le32(OCFS2_VALID_FL
)),
2195 "Stale dinode %llu dtime: %llu flags: 0x%x\n",
2196 (unsigned long long)oi
->ip_blkno
,
2197 (unsigned long long)le64_to_cpu(fe
->i_dtime
),
2198 le32_to_cpu(fe
->i_flags
));
2200 ocfs2_refresh_inode(inode
, fe
);
2201 ocfs2_track_lock_refresh(lockres
);
2206 ocfs2_complete_lock_res_refresh(lockres
, status
);
2212 static int ocfs2_assign_bh(struct inode
*inode
,
2213 struct buffer_head
**ret_bh
,
2214 struct buffer_head
*passed_bh
)
2219 /* Ok, the update went to disk for us, use the
2221 *ret_bh
= passed_bh
;
2227 status
= ocfs2_read_inode_block(inode
, ret_bh
);
2235 * returns < 0 error if the callback will never be called, otherwise
2236 * the result of the lock will be communicated via the callback.
2238 int ocfs2_inode_lock_full_nested(struct inode
*inode
,
2239 struct buffer_head
**ret_bh
,
2244 int status
, level
, acquired
;
2246 struct ocfs2_lock_res
*lockres
= NULL
;
2247 struct ocfs2_super
*osb
= OCFS2_SB(inode
->i_sb
);
2248 struct buffer_head
*local_bh
= NULL
;
2254 mlog(0, "inode %llu, take %s META lock\n",
2255 (unsigned long long)OCFS2_I(inode
)->ip_blkno
,
2256 ex
? "EXMODE" : "PRMODE");
2260 /* We'll allow faking a readonly metadata lock for
2262 if (ocfs2_is_hard_readonly(osb
)) {
2268 if (ocfs2_mount_local(osb
))
2271 if (!(arg_flags
& OCFS2_META_LOCK_RECOVERY
))
2272 ocfs2_wait_for_recovery(osb
);
2274 lockres
= &OCFS2_I(inode
)->ip_inode_lockres
;
2275 level
= ex
? DLM_LOCK_EX
: DLM_LOCK_PR
;
2277 if (arg_flags
& OCFS2_META_LOCK_NOQUEUE
)
2278 dlm_flags
|= DLM_LKF_NOQUEUE
;
2280 status
= __ocfs2_cluster_lock(osb
, lockres
, level
, dlm_flags
,
2281 arg_flags
, subclass
, _RET_IP_
);
2283 if (status
!= -EAGAIN
&& status
!= -EIOCBRETRY
)
2288 /* Notify the error cleanup path to drop the cluster lock. */
2291 /* We wait twice because a node may have died while we were in
2292 * the lower dlm layers. The second time though, we've
2293 * committed to owning this lock so we don't allow signals to
2294 * abort the operation. */
2295 if (!(arg_flags
& OCFS2_META_LOCK_RECOVERY
))
2296 ocfs2_wait_for_recovery(osb
);
2300 * We only see this flag if we're being called from
2301 * ocfs2_read_locked_inode(). It means we're locking an inode
2302 * which hasn't been populated yet, so clear the refresh flag
2303 * and let the caller handle it.
2305 if (inode
->i_state
& I_NEW
) {
2308 ocfs2_complete_lock_res_refresh(lockres
, 0);
2312 /* This is fun. The caller may want a bh back, or it may
2313 * not. ocfs2_inode_lock_update definitely wants one in, but
2314 * may or may not read one, depending on what's in the
2315 * LVB. The result of all of this is that we've *only* gone to
2316 * disk if we have to, so the complexity is worthwhile. */
2317 status
= ocfs2_inode_lock_update(inode
, &local_bh
);
2319 if (status
!= -ENOENT
)
2325 status
= ocfs2_assign_bh(inode
, ret_bh
, local_bh
);
2334 if (ret_bh
&& (*ret_bh
)) {
2339 ocfs2_inode_unlock(inode
, ex
);
2350 * This is working around a lock inversion between tasks acquiring DLM
2351 * locks while holding a page lock and the downconvert thread which
2352 * blocks dlm lock acquiry while acquiring page locks.
2354 * ** These _with_page variantes are only intended to be called from aop
2355 * methods that hold page locks and return a very specific *positive* error
2356 * code that aop methods pass up to the VFS -- test for errors with != 0. **
2358 * The DLM is called such that it returns -EAGAIN if it would have
2359 * blocked waiting for the downconvert thread. In that case we unlock
2360 * our page so the downconvert thread can make progress. Once we've
2361 * done this we have to return AOP_TRUNCATED_PAGE so the aop method
2362 * that called us can bubble that back up into the VFS who will then
2363 * immediately retry the aop call.
2365 * We do a blocking lock and immediate unlock before returning, though, so that
2366 * the lock has a great chance of being cached on this node by the time the VFS
2367 * calls back to retry the aop. This has a potential to livelock as nodes
2368 * ping locks back and forth, but that's a risk we're willing to take to avoid
2369 * the lock inversion simply.
2371 int ocfs2_inode_lock_with_page(struct inode
*inode
,
2372 struct buffer_head
**ret_bh
,
2378 ret
= ocfs2_inode_lock_full(inode
, ret_bh
, ex
, OCFS2_LOCK_NONBLOCK
);
2379 if (ret
== -EAGAIN
) {
2381 if (ocfs2_inode_lock(inode
, ret_bh
, ex
) == 0)
2382 ocfs2_inode_unlock(inode
, ex
);
2383 ret
= AOP_TRUNCATED_PAGE
;
2389 int ocfs2_inode_lock_atime(struct inode
*inode
,
2390 struct vfsmount
*vfsmnt
,
2396 ret
= ocfs2_inode_lock(inode
, NULL
, 0);
2403 * If we should update atime, we will get EX lock,
2404 * otherwise we just get PR lock.
2406 if (ocfs2_should_update_atime(inode
, vfsmnt
)) {
2407 struct buffer_head
*bh
= NULL
;
2409 ocfs2_inode_unlock(inode
, 0);
2410 ret
= ocfs2_inode_lock(inode
, &bh
, 1);
2416 if (ocfs2_should_update_atime(inode
, vfsmnt
))
2417 ocfs2_update_inode_atime(inode
, bh
);
2427 void ocfs2_inode_unlock(struct inode
*inode
,
2430 int level
= ex
? DLM_LOCK_EX
: DLM_LOCK_PR
;
2431 struct ocfs2_lock_res
*lockres
= &OCFS2_I(inode
)->ip_inode_lockres
;
2432 struct ocfs2_super
*osb
= OCFS2_SB(inode
->i_sb
);
2436 mlog(0, "inode %llu drop %s META lock\n",
2437 (unsigned long long)OCFS2_I(inode
)->ip_blkno
,
2438 ex
? "EXMODE" : "PRMODE");
2440 if (!ocfs2_is_hard_readonly(OCFS2_SB(inode
->i_sb
)) &&
2441 !ocfs2_mount_local(osb
))
2442 ocfs2_cluster_unlock(OCFS2_SB(inode
->i_sb
), lockres
, level
);
2447 int ocfs2_orphan_scan_lock(struct ocfs2_super
*osb
, u32
*seqno
)
2449 struct ocfs2_lock_res
*lockres
;
2450 struct ocfs2_orphan_scan_lvb
*lvb
;
2453 if (ocfs2_is_hard_readonly(osb
))
2456 if (ocfs2_mount_local(osb
))
2459 lockres
= &osb
->osb_orphan_scan
.os_lockres
;
2460 status
= ocfs2_cluster_lock(osb
, lockres
, DLM_LOCK_EX
, 0, 0);
2464 lvb
= ocfs2_dlm_lvb(&lockres
->l_lksb
);
2465 if (ocfs2_dlm_lvb_valid(&lockres
->l_lksb
) &&
2466 lvb
->lvb_version
== OCFS2_ORPHAN_LVB_VERSION
)
2467 *seqno
= be32_to_cpu(lvb
->lvb_os_seqno
);
2469 *seqno
= osb
->osb_orphan_scan
.os_seqno
+ 1;
2474 void ocfs2_orphan_scan_unlock(struct ocfs2_super
*osb
, u32 seqno
)
2476 struct ocfs2_lock_res
*lockres
;
2477 struct ocfs2_orphan_scan_lvb
*lvb
;
2479 if (!ocfs2_is_hard_readonly(osb
) && !ocfs2_mount_local(osb
)) {
2480 lockres
= &osb
->osb_orphan_scan
.os_lockres
;
2481 lvb
= ocfs2_dlm_lvb(&lockres
->l_lksb
);
2482 lvb
->lvb_version
= OCFS2_ORPHAN_LVB_VERSION
;
2483 lvb
->lvb_os_seqno
= cpu_to_be32(seqno
);
2484 ocfs2_cluster_unlock(osb
, lockres
, DLM_LOCK_EX
);
2488 int ocfs2_super_lock(struct ocfs2_super
*osb
,
2492 int level
= ex
? DLM_LOCK_EX
: DLM_LOCK_PR
;
2493 struct ocfs2_lock_res
*lockres
= &osb
->osb_super_lockres
;
2497 if (ocfs2_is_hard_readonly(osb
))
2500 if (ocfs2_mount_local(osb
))
2503 status
= ocfs2_cluster_lock(osb
, lockres
, level
, 0, 0);
2509 /* The super block lock path is really in the best position to
2510 * know when resources covered by the lock need to be
2511 * refreshed, so we do it here. Of course, making sense of
2512 * everything is up to the caller :) */
2513 status
= ocfs2_should_refresh_lock_res(lockres
);
2519 status
= ocfs2_refresh_slot_info(osb
);
2521 ocfs2_complete_lock_res_refresh(lockres
, status
);
2525 ocfs2_track_lock_refresh(lockres
);
2532 void ocfs2_super_unlock(struct ocfs2_super
*osb
,
2535 int level
= ex
? DLM_LOCK_EX
: DLM_LOCK_PR
;
2536 struct ocfs2_lock_res
*lockres
= &osb
->osb_super_lockres
;
2538 if (!ocfs2_mount_local(osb
))
2539 ocfs2_cluster_unlock(osb
, lockres
, level
);
2542 int ocfs2_rename_lock(struct ocfs2_super
*osb
)
2545 struct ocfs2_lock_res
*lockres
= &osb
->osb_rename_lockres
;
2547 if (ocfs2_is_hard_readonly(osb
))
2550 if (ocfs2_mount_local(osb
))
2553 status
= ocfs2_cluster_lock(osb
, lockres
, DLM_LOCK_EX
, 0, 0);
2560 void ocfs2_rename_unlock(struct ocfs2_super
*osb
)
2562 struct ocfs2_lock_res
*lockres
= &osb
->osb_rename_lockres
;
2564 if (!ocfs2_mount_local(osb
))
2565 ocfs2_cluster_unlock(osb
, lockres
, DLM_LOCK_EX
);
2568 int ocfs2_nfs_sync_lock(struct ocfs2_super
*osb
, int ex
)
2571 struct ocfs2_lock_res
*lockres
= &osb
->osb_nfs_sync_lockres
;
2573 if (ocfs2_is_hard_readonly(osb
))
2576 if (ocfs2_mount_local(osb
))
2579 status
= ocfs2_cluster_lock(osb
, lockres
, ex
? LKM_EXMODE
: LKM_PRMODE
,
2582 mlog(ML_ERROR
, "lock on nfs sync lock failed %d\n", status
);
2587 void ocfs2_nfs_sync_unlock(struct ocfs2_super
*osb
, int ex
)
2589 struct ocfs2_lock_res
*lockres
= &osb
->osb_nfs_sync_lockres
;
2591 if (!ocfs2_mount_local(osb
))
2592 ocfs2_cluster_unlock(osb
, lockres
,
2593 ex
? LKM_EXMODE
: LKM_PRMODE
);
2596 int ocfs2_dentry_lock(struct dentry
*dentry
, int ex
)
2599 int level
= ex
? DLM_LOCK_EX
: DLM_LOCK_PR
;
2600 struct ocfs2_dentry_lock
*dl
= dentry
->d_fsdata
;
2601 struct ocfs2_super
*osb
= OCFS2_SB(dentry
->d_sb
);
2605 if (ocfs2_is_hard_readonly(osb
))
2608 if (ocfs2_mount_local(osb
))
2611 ret
= ocfs2_cluster_lock(osb
, &dl
->dl_lockres
, level
, 0, 0);
2618 void ocfs2_dentry_unlock(struct dentry
*dentry
, int ex
)
2620 int level
= ex
? DLM_LOCK_EX
: DLM_LOCK_PR
;
2621 struct ocfs2_dentry_lock
*dl
= dentry
->d_fsdata
;
2622 struct ocfs2_super
*osb
= OCFS2_SB(dentry
->d_sb
);
2624 if (!ocfs2_mount_local(osb
))
2625 ocfs2_cluster_unlock(osb
, &dl
->dl_lockres
, level
);
2628 /* Reference counting of the dlm debug structure. We want this because
2629 * open references on the debug inodes can live on after a mount, so
2630 * we can't rely on the ocfs2_super to always exist. */
2631 static void ocfs2_dlm_debug_free(struct kref
*kref
)
2633 struct ocfs2_dlm_debug
*dlm_debug
;
2635 dlm_debug
= container_of(kref
, struct ocfs2_dlm_debug
, d_refcnt
);
2640 void ocfs2_put_dlm_debug(struct ocfs2_dlm_debug
*dlm_debug
)
2643 kref_put(&dlm_debug
->d_refcnt
, ocfs2_dlm_debug_free
);
2646 static void ocfs2_get_dlm_debug(struct ocfs2_dlm_debug
*debug
)
2648 kref_get(&debug
->d_refcnt
);
2651 struct ocfs2_dlm_debug
*ocfs2_new_dlm_debug(void)
2653 struct ocfs2_dlm_debug
*dlm_debug
;
2655 dlm_debug
= kmalloc(sizeof(struct ocfs2_dlm_debug
), GFP_KERNEL
);
2657 mlog_errno(-ENOMEM
);
2661 kref_init(&dlm_debug
->d_refcnt
);
2662 INIT_LIST_HEAD(&dlm_debug
->d_lockres_tracking
);
2663 dlm_debug
->d_locking_state
= NULL
;
2668 /* Access to this is arbitrated for us via seq_file->sem. */
2669 struct ocfs2_dlm_seq_priv
{
2670 struct ocfs2_dlm_debug
*p_dlm_debug
;
2671 struct ocfs2_lock_res p_iter_res
;
2672 struct ocfs2_lock_res p_tmp_res
;
2675 static struct ocfs2_lock_res
*ocfs2_dlm_next_res(struct ocfs2_lock_res
*start
,
2676 struct ocfs2_dlm_seq_priv
*priv
)
2678 struct ocfs2_lock_res
*iter
, *ret
= NULL
;
2679 struct ocfs2_dlm_debug
*dlm_debug
= priv
->p_dlm_debug
;
2681 assert_spin_locked(&ocfs2_dlm_tracking_lock
);
2683 list_for_each_entry(iter
, &start
->l_debug_list
, l_debug_list
) {
2684 /* discover the head of the list */
2685 if (&iter
->l_debug_list
== &dlm_debug
->d_lockres_tracking
) {
2686 mlog(0, "End of list found, %p\n", ret
);
2690 /* We track our "dummy" iteration lockres' by a NULL
2692 if (iter
->l_ops
!= NULL
) {
2701 static void *ocfs2_dlm_seq_start(struct seq_file
*m
, loff_t
*pos
)
2703 struct ocfs2_dlm_seq_priv
*priv
= m
->private;
2704 struct ocfs2_lock_res
*iter
;
2706 spin_lock(&ocfs2_dlm_tracking_lock
);
2707 iter
= ocfs2_dlm_next_res(&priv
->p_iter_res
, priv
);
2709 /* Since lockres' have the lifetime of their container
2710 * (which can be inodes, ocfs2_supers, etc) we want to
2711 * copy this out to a temporary lockres while still
2712 * under the spinlock. Obviously after this we can't
2713 * trust any pointers on the copy returned, but that's
2714 * ok as the information we want isn't typically held
2716 priv
->p_tmp_res
= *iter
;
2717 iter
= &priv
->p_tmp_res
;
2719 spin_unlock(&ocfs2_dlm_tracking_lock
);
2724 static void ocfs2_dlm_seq_stop(struct seq_file
*m
, void *v
)
2728 static void *ocfs2_dlm_seq_next(struct seq_file
*m
, void *v
, loff_t
*pos
)
2730 struct ocfs2_dlm_seq_priv
*priv
= m
->private;
2731 struct ocfs2_lock_res
*iter
= v
;
2732 struct ocfs2_lock_res
*dummy
= &priv
->p_iter_res
;
2734 spin_lock(&ocfs2_dlm_tracking_lock
);
2735 iter
= ocfs2_dlm_next_res(iter
, priv
);
2736 list_del_init(&dummy
->l_debug_list
);
2738 list_add(&dummy
->l_debug_list
, &iter
->l_debug_list
);
2739 priv
->p_tmp_res
= *iter
;
2740 iter
= &priv
->p_tmp_res
;
2742 spin_unlock(&ocfs2_dlm_tracking_lock
);
2747 /* So that debugfs.ocfs2 can determine which format is being used */
2748 #define OCFS2_DLM_DEBUG_STR_VERSION 2
2749 static int ocfs2_dlm_seq_show(struct seq_file
*m
, void *v
)
2753 struct ocfs2_lock_res
*lockres
= v
;
2758 seq_printf(m
, "0x%x\t", OCFS2_DLM_DEBUG_STR_VERSION
);
2760 if (lockres
->l_type
== OCFS2_LOCK_TYPE_DENTRY
)
2761 seq_printf(m
, "%.*s%08x\t", OCFS2_DENTRY_LOCK_INO_START
- 1,
2763 (unsigned int)ocfs2_get_dentry_lock_ino(lockres
));
2765 seq_printf(m
, "%.*s\t", OCFS2_LOCK_ID_MAX_LEN
, lockres
->l_name
);
2767 seq_printf(m
, "%d\t"
2778 lockres
->l_unlock_action
,
2779 lockres
->l_ro_holders
,
2780 lockres
->l_ex_holders
,
2781 lockres
->l_requested
,
2782 lockres
->l_blocking
);
2784 /* Dump the raw LVB */
2785 lvb
= ocfs2_dlm_lvb(&lockres
->l_lksb
);
2786 for(i
= 0; i
< DLM_LVB_LEN
; i
++)
2787 seq_printf(m
, "0x%x\t", lvb
[i
]);
2789 #ifdef CONFIG_OCFS2_FS_STATS
2790 # define lock_num_prmode(_l) (_l)->l_lock_num_prmode
2791 # define lock_num_exmode(_l) (_l)->l_lock_num_exmode
2792 # define lock_num_prmode_failed(_l) (_l)->l_lock_num_prmode_failed
2793 # define lock_num_exmode_failed(_l) (_l)->l_lock_num_exmode_failed
2794 # define lock_total_prmode(_l) (_l)->l_lock_total_prmode
2795 # define lock_total_exmode(_l) (_l)->l_lock_total_exmode
2796 # define lock_max_prmode(_l) (_l)->l_lock_max_prmode
2797 # define lock_max_exmode(_l) (_l)->l_lock_max_exmode
2798 # define lock_refresh(_l) (_l)->l_lock_refresh
2800 # define lock_num_prmode(_l) (0ULL)
2801 # define lock_num_exmode(_l) (0ULL)
2802 # define lock_num_prmode_failed(_l) (0)
2803 # define lock_num_exmode_failed(_l) (0)
2804 # define lock_total_prmode(_l) (0ULL)
2805 # define lock_total_exmode(_l) (0ULL)
2806 # define lock_max_prmode(_l) (0)
2807 # define lock_max_exmode(_l) (0)
2808 # define lock_refresh(_l) (0)
2810 /* The following seq_print was added in version 2 of this output */
2811 seq_printf(m
, "%llu\t"
2820 lock_num_prmode(lockres
),
2821 lock_num_exmode(lockres
),
2822 lock_num_prmode_failed(lockres
),
2823 lock_num_exmode_failed(lockres
),
2824 lock_total_prmode(lockres
),
2825 lock_total_exmode(lockres
),
2826 lock_max_prmode(lockres
),
2827 lock_max_exmode(lockres
),
2828 lock_refresh(lockres
));
2831 seq_printf(m
, "\n");
2835 static const struct seq_operations ocfs2_dlm_seq_ops
= {
2836 .start
= ocfs2_dlm_seq_start
,
2837 .stop
= ocfs2_dlm_seq_stop
,
2838 .next
= ocfs2_dlm_seq_next
,
2839 .show
= ocfs2_dlm_seq_show
,
2842 static int ocfs2_dlm_debug_release(struct inode
*inode
, struct file
*file
)
2844 struct seq_file
*seq
= (struct seq_file
*) file
->private_data
;
2845 struct ocfs2_dlm_seq_priv
*priv
= seq
->private;
2846 struct ocfs2_lock_res
*res
= &priv
->p_iter_res
;
2848 ocfs2_remove_lockres_tracking(res
);
2849 ocfs2_put_dlm_debug(priv
->p_dlm_debug
);
2850 return seq_release_private(inode
, file
);
2853 static int ocfs2_dlm_debug_open(struct inode
*inode
, struct file
*file
)
2856 struct ocfs2_dlm_seq_priv
*priv
;
2857 struct seq_file
*seq
;
2858 struct ocfs2_super
*osb
;
2860 priv
= kzalloc(sizeof(struct ocfs2_dlm_seq_priv
), GFP_KERNEL
);
2866 osb
= inode
->i_private
;
2867 ocfs2_get_dlm_debug(osb
->osb_dlm_debug
);
2868 priv
->p_dlm_debug
= osb
->osb_dlm_debug
;
2869 INIT_LIST_HEAD(&priv
->p_iter_res
.l_debug_list
);
2871 ret
= seq_open(file
, &ocfs2_dlm_seq_ops
);
2878 seq
= (struct seq_file
*) file
->private_data
;
2879 seq
->private = priv
;
2881 ocfs2_add_lockres_tracking(&priv
->p_iter_res
,
2888 static const struct file_operations ocfs2_dlm_debug_fops
= {
2889 .open
= ocfs2_dlm_debug_open
,
2890 .release
= ocfs2_dlm_debug_release
,
2892 .llseek
= seq_lseek
,
2895 static int ocfs2_dlm_init_debug(struct ocfs2_super
*osb
)
2898 struct ocfs2_dlm_debug
*dlm_debug
= osb
->osb_dlm_debug
;
2900 dlm_debug
->d_locking_state
= debugfs_create_file("locking_state",
2902 osb
->osb_debug_root
,
2904 &ocfs2_dlm_debug_fops
);
2905 if (!dlm_debug
->d_locking_state
) {
2908 "Unable to create locking state debugfs file.\n");
2912 ocfs2_get_dlm_debug(dlm_debug
);
2917 static void ocfs2_dlm_shutdown_debug(struct ocfs2_super
*osb
)
2919 struct ocfs2_dlm_debug
*dlm_debug
= osb
->osb_dlm_debug
;
2922 debugfs_remove(dlm_debug
->d_locking_state
);
2923 ocfs2_put_dlm_debug(dlm_debug
);
2927 int ocfs2_dlm_init(struct ocfs2_super
*osb
)
2930 struct ocfs2_cluster_connection
*conn
= NULL
;
2934 if (ocfs2_mount_local(osb
)) {
2939 status
= ocfs2_dlm_init_debug(osb
);
2945 /* launch downconvert thread */
2946 osb
->dc_task
= kthread_run(ocfs2_downconvert_thread
, osb
, "ocfs2dc");
2947 if (IS_ERR(osb
->dc_task
)) {
2948 status
= PTR_ERR(osb
->dc_task
);
2949 osb
->dc_task
= NULL
;
2954 /* for now, uuid == domain */
2955 status
= ocfs2_cluster_connect(osb
->osb_cluster_stack
,
2957 strlen(osb
->uuid_str
),
2958 ocfs2_do_node_down
, osb
,
2965 status
= ocfs2_cluster_this_node(&osb
->node_num
);
2969 "could not find this host's node number\n");
2970 ocfs2_cluster_disconnect(conn
, 0);
2975 ocfs2_super_lock_res_init(&osb
->osb_super_lockres
, osb
);
2976 ocfs2_rename_lock_res_init(&osb
->osb_rename_lockres
, osb
);
2977 ocfs2_nfs_sync_lock_res_init(&osb
->osb_nfs_sync_lockres
, osb
);
2978 ocfs2_orphan_scan_lock_res_init(&osb
->osb_orphan_scan
.os_lockres
, osb
);
2985 ocfs2_dlm_shutdown_debug(osb
);
2987 kthread_stop(osb
->dc_task
);
2994 void ocfs2_dlm_shutdown(struct ocfs2_super
*osb
,
2999 ocfs2_drop_osb_locks(osb
);
3002 * Now that we have dropped all locks and ocfs2_dismount_volume()
3003 * has disabled recovery, the DLM won't be talking to us. It's
3004 * safe to tear things down before disconnecting the cluster.
3008 kthread_stop(osb
->dc_task
);
3009 osb
->dc_task
= NULL
;
3012 ocfs2_lock_res_free(&osb
->osb_super_lockres
);
3013 ocfs2_lock_res_free(&osb
->osb_rename_lockres
);
3014 ocfs2_lock_res_free(&osb
->osb_nfs_sync_lockres
);
3015 ocfs2_lock_res_free(&osb
->osb_orphan_scan
.os_lockres
);
3017 ocfs2_cluster_disconnect(osb
->cconn
, hangup_pending
);
3020 ocfs2_dlm_shutdown_debug(osb
);
3025 static void ocfs2_unlock_ast(void *opaque
, int error
)
3027 struct ocfs2_lock_res
*lockres
= opaque
;
3028 unsigned long flags
;
3032 mlog(0, "UNLOCK AST called on lock %s, action = %d\n", lockres
->l_name
,
3033 lockres
->l_unlock_action
);
3035 spin_lock_irqsave(&lockres
->l_lock
, flags
);
3037 mlog(ML_ERROR
, "Dlm passes error %d for lock %s, "
3038 "unlock_action %d\n", error
, lockres
->l_name
,
3039 lockres
->l_unlock_action
);
3040 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
3044 switch(lockres
->l_unlock_action
) {
3045 case OCFS2_UNLOCK_CANCEL_CONVERT
:
3046 mlog(0, "Cancel convert success for %s\n", lockres
->l_name
);
3047 lockres
->l_action
= OCFS2_AST_INVALID
;
3048 /* Downconvert thread may have requeued this lock, we
3049 * need to wake it. */
3050 if (lockres
->l_flags
& OCFS2_LOCK_BLOCKED
)
3051 ocfs2_wake_downconvert_thread(ocfs2_get_lockres_osb(lockres
));
3053 case OCFS2_UNLOCK_DROP_LOCK
:
3054 lockres
->l_level
= DLM_LOCK_IV
;
3060 lockres_clear_flags(lockres
, OCFS2_LOCK_BUSY
);
3061 lockres
->l_unlock_action
= OCFS2_UNLOCK_INVALID
;
3062 wake_up(&lockres
->l_event
);
3063 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
3068 static int ocfs2_drop_lock(struct ocfs2_super
*osb
,
3069 struct ocfs2_lock_res
*lockres
)
3072 unsigned long flags
;
3075 /* We didn't get anywhere near actually using this lockres. */
3076 if (!(lockres
->l_flags
& OCFS2_LOCK_INITIALIZED
))
3079 if (lockres
->l_ops
->flags
& LOCK_TYPE_USES_LVB
)
3080 lkm_flags
|= DLM_LKF_VALBLK
;
3082 spin_lock_irqsave(&lockres
->l_lock
, flags
);
3084 mlog_bug_on_msg(!(lockres
->l_flags
& OCFS2_LOCK_FREEING
),
3085 "lockres %s, flags 0x%lx\n",
3086 lockres
->l_name
, lockres
->l_flags
);
3088 while (lockres
->l_flags
& OCFS2_LOCK_BUSY
) {
3089 mlog(0, "waiting on busy lock \"%s\": flags = %lx, action = "
3090 "%u, unlock_action = %u\n",
3091 lockres
->l_name
, lockres
->l_flags
, lockres
->l_action
,
3092 lockres
->l_unlock_action
);
3094 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
3096 /* XXX: Today we just wait on any busy
3097 * locks... Perhaps we need to cancel converts in the
3099 ocfs2_wait_on_busy_lock(lockres
);
3101 spin_lock_irqsave(&lockres
->l_lock
, flags
);
3104 if (lockres
->l_ops
->flags
& LOCK_TYPE_USES_LVB
) {
3105 if (lockres
->l_flags
& OCFS2_LOCK_ATTACHED
&&
3106 lockres
->l_level
== DLM_LOCK_EX
&&
3107 !(lockres
->l_flags
& OCFS2_LOCK_NEEDS_REFRESH
))
3108 lockres
->l_ops
->set_lvb(lockres
);
3111 if (lockres
->l_flags
& OCFS2_LOCK_BUSY
)
3112 mlog(ML_ERROR
, "destroying busy lock: \"%s\"\n",
3114 if (lockres
->l_flags
& OCFS2_LOCK_BLOCKED
)
3115 mlog(0, "destroying blocked lock: \"%s\"\n", lockres
->l_name
);
3117 if (!(lockres
->l_flags
& OCFS2_LOCK_ATTACHED
)) {
3118 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
3122 lockres_clear_flags(lockres
, OCFS2_LOCK_ATTACHED
);
3124 /* make sure we never get here while waiting for an ast to
3126 BUG_ON(lockres
->l_action
!= OCFS2_AST_INVALID
);
3128 /* is this necessary? */
3129 lockres_or_flags(lockres
, OCFS2_LOCK_BUSY
);
3130 lockres
->l_unlock_action
= OCFS2_UNLOCK_DROP_LOCK
;
3131 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
3133 mlog(0, "lock %s\n", lockres
->l_name
);
3135 ret
= ocfs2_dlm_unlock(osb
->cconn
, &lockres
->l_lksb
, lkm_flags
,
3138 ocfs2_log_dlm_error("ocfs2_dlm_unlock", ret
, lockres
);
3139 mlog(ML_ERROR
, "lockres flags: %lu\n", lockres
->l_flags
);
3140 ocfs2_dlm_dump_lksb(&lockres
->l_lksb
);
3143 mlog(0, "lock %s, successful return from ocfs2_dlm_unlock\n",
3146 ocfs2_wait_on_busy_lock(lockres
);
3152 /* Mark the lockres as being dropped. It will no longer be
3153 * queued if blocking, but we still may have to wait on it
3154 * being dequeued from the downconvert thread before we can consider
3157 * You can *not* attempt to call cluster_lock on this lockres anymore. */
3158 void ocfs2_mark_lockres_freeing(struct ocfs2_lock_res
*lockres
)
3161 struct ocfs2_mask_waiter mw
;
3162 unsigned long flags
;
3164 ocfs2_init_mask_waiter(&mw
);
3166 spin_lock_irqsave(&lockres
->l_lock
, flags
);
3167 lockres
->l_flags
|= OCFS2_LOCK_FREEING
;
3168 while (lockres
->l_flags
& OCFS2_LOCK_QUEUED
) {
3169 lockres_add_mask_waiter(lockres
, &mw
, OCFS2_LOCK_QUEUED
, 0);
3170 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
3172 mlog(0, "Waiting on lockres %s\n", lockres
->l_name
);
3174 status
= ocfs2_wait_for_mask(&mw
);
3178 spin_lock_irqsave(&lockres
->l_lock
, flags
);
3180 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
3183 void ocfs2_simple_drop_lockres(struct ocfs2_super
*osb
,
3184 struct ocfs2_lock_res
*lockres
)
3188 ocfs2_mark_lockres_freeing(lockres
);
3189 ret
= ocfs2_drop_lock(osb
, lockres
);
3194 static void ocfs2_drop_osb_locks(struct ocfs2_super
*osb
)
3196 ocfs2_simple_drop_lockres(osb
, &osb
->osb_super_lockres
);
3197 ocfs2_simple_drop_lockres(osb
, &osb
->osb_rename_lockres
);
3198 ocfs2_simple_drop_lockres(osb
, &osb
->osb_nfs_sync_lockres
);
3199 ocfs2_simple_drop_lockres(osb
, &osb
->osb_orphan_scan
.os_lockres
);
3202 int ocfs2_drop_inode_locks(struct inode
*inode
)
3208 /* No need to call ocfs2_mark_lockres_freeing here -
3209 * ocfs2_clear_inode has done it for us. */
3211 err
= ocfs2_drop_lock(OCFS2_SB(inode
->i_sb
),
3212 &OCFS2_I(inode
)->ip_open_lockres
);
3218 err
= ocfs2_drop_lock(OCFS2_SB(inode
->i_sb
),
3219 &OCFS2_I(inode
)->ip_inode_lockres
);
3222 if (err
< 0 && !status
)
3225 err
= ocfs2_drop_lock(OCFS2_SB(inode
->i_sb
),
3226 &OCFS2_I(inode
)->ip_rw_lockres
);
3229 if (err
< 0 && !status
)
3236 static unsigned int ocfs2_prepare_downconvert(struct ocfs2_lock_res
*lockres
,
3239 assert_spin_locked(&lockres
->l_lock
);
3241 BUG_ON(lockres
->l_blocking
<= DLM_LOCK_NL
);
3243 if (lockres
->l_level
<= new_level
) {
3244 mlog(ML_ERROR
, "lockres->l_level (%d) <= new_level (%d)\n",
3245 lockres
->l_level
, new_level
);
3249 mlog(0, "lock %s, new_level = %d, l_blocking = %d\n",
3250 lockres
->l_name
, new_level
, lockres
->l_blocking
);
3252 lockres
->l_action
= OCFS2_AST_DOWNCONVERT
;
3253 lockres
->l_requested
= new_level
;
3254 lockres_or_flags(lockres
, OCFS2_LOCK_BUSY
);
3255 return lockres_set_pending(lockres
);
3258 static int ocfs2_downconvert_lock(struct ocfs2_super
*osb
,
3259 struct ocfs2_lock_res
*lockres
,
3262 unsigned int generation
)
3265 u32 dlm_flags
= DLM_LKF_CONVERT
;
3270 dlm_flags
|= DLM_LKF_VALBLK
;
3272 ret
= ocfs2_dlm_lock(osb
->cconn
,
3277 OCFS2_LOCK_ID_MAX_LEN
- 1,
3279 lockres_clear_pending(lockres
, generation
, osb
);
3281 ocfs2_log_dlm_error("ocfs2_dlm_lock", ret
, lockres
);
3282 ocfs2_recover_from_dlm_error(lockres
, 1);
3292 /* returns 1 when the caller should unlock and call ocfs2_dlm_unlock */
3293 static int ocfs2_prepare_cancel_convert(struct ocfs2_super
*osb
,
3294 struct ocfs2_lock_res
*lockres
)
3296 assert_spin_locked(&lockres
->l_lock
);
3299 mlog(0, "lock %s\n", lockres
->l_name
);
3301 if (lockres
->l_unlock_action
== OCFS2_UNLOCK_CANCEL_CONVERT
) {
3302 /* If we're already trying to cancel a lock conversion
3303 * then just drop the spinlock and allow the caller to
3304 * requeue this lock. */
3306 mlog(0, "Lockres %s, skip convert\n", lockres
->l_name
);
3310 /* were we in a convert when we got the bast fire? */
3311 BUG_ON(lockres
->l_action
!= OCFS2_AST_CONVERT
&&
3312 lockres
->l_action
!= OCFS2_AST_DOWNCONVERT
);
3313 /* set things up for the unlockast to know to just
3314 * clear out the ast_action and unset busy, etc. */
3315 lockres
->l_unlock_action
= OCFS2_UNLOCK_CANCEL_CONVERT
;
3317 mlog_bug_on_msg(!(lockres
->l_flags
& OCFS2_LOCK_BUSY
),
3318 "lock %s, invalid flags: 0x%lx\n",
3319 lockres
->l_name
, lockres
->l_flags
);
3324 static int ocfs2_cancel_convert(struct ocfs2_super
*osb
,
3325 struct ocfs2_lock_res
*lockres
)
3330 mlog(0, "lock %s\n", lockres
->l_name
);
3332 ret
= ocfs2_dlm_unlock(osb
->cconn
, &lockres
->l_lksb
,
3333 DLM_LKF_CANCEL
, lockres
);
3335 ocfs2_log_dlm_error("ocfs2_dlm_unlock", ret
, lockres
);
3336 ocfs2_recover_from_dlm_error(lockres
, 0);
3339 mlog(0, "lock %s return from ocfs2_dlm_unlock\n", lockres
->l_name
);
3345 static int ocfs2_unblock_lock(struct ocfs2_super
*osb
,
3346 struct ocfs2_lock_res
*lockres
,
3347 struct ocfs2_unblock_ctl
*ctl
)
3349 unsigned long flags
;
3358 spin_lock_irqsave(&lockres
->l_lock
, flags
);
3360 BUG_ON(!(lockres
->l_flags
& OCFS2_LOCK_BLOCKED
));
3363 if (lockres
->l_flags
& OCFS2_LOCK_BUSY
) {
3365 * This is a *big* race. The OCFS2_LOCK_PENDING flag
3366 * exists entirely for one reason - another thread has set
3367 * OCFS2_LOCK_BUSY, but has *NOT* yet called dlm_lock().
3369 * If we do ocfs2_cancel_convert() before the other thread
3370 * calls dlm_lock(), our cancel will do nothing. We will
3371 * get no ast, and we will have no way of knowing the
3372 * cancel failed. Meanwhile, the other thread will call
3373 * into dlm_lock() and wait...forever.
3375 * Why forever? Because another node has asked for the
3376 * lock first; that's why we're here in unblock_lock().
3378 * The solution is OCFS2_LOCK_PENDING. When PENDING is
3379 * set, we just requeue the unblock. Only when the other
3380 * thread has called dlm_lock() and cleared PENDING will
3381 * we then cancel their request.
3383 * All callers of dlm_lock() must set OCFS2_DLM_PENDING
3384 * at the same time they set OCFS2_DLM_BUSY. They must
3385 * clear OCFS2_DLM_PENDING after dlm_lock() returns.
3387 if (lockres
->l_flags
& OCFS2_LOCK_PENDING
)
3391 ret
= ocfs2_prepare_cancel_convert(osb
, lockres
);
3392 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
3394 ret
= ocfs2_cancel_convert(osb
, lockres
);
3401 /* if we're blocking an exclusive and we have *any* holders,
3403 if ((lockres
->l_blocking
== DLM_LOCK_EX
)
3404 && (lockres
->l_ex_holders
|| lockres
->l_ro_holders
))
3407 /* If it's a PR we're blocking, then only
3408 * requeue if we've got any EX holders */
3409 if (lockres
->l_blocking
== DLM_LOCK_PR
&&
3410 lockres
->l_ex_holders
)
3414 * Can we get a lock in this state if the holder counts are
3415 * zero? The meta data unblock code used to check this.
3417 if ((lockres
->l_ops
->flags
& LOCK_TYPE_REQUIRES_REFRESH
)
3418 && (lockres
->l_flags
& OCFS2_LOCK_REFRESHING
))
3421 new_level
= ocfs2_highest_compat_lock_level(lockres
->l_blocking
);
3423 if (lockres
->l_ops
->check_downconvert
3424 && !lockres
->l_ops
->check_downconvert(lockres
, new_level
))
3427 /* If we get here, then we know that there are no more
3428 * incompatible holders (and anyone asking for an incompatible
3429 * lock is blocked). We can now downconvert the lock */
3430 if (!lockres
->l_ops
->downconvert_worker
)
3433 /* Some lockres types want to do a bit of work before
3434 * downconverting a lock. Allow that here. The worker function
3435 * may sleep, so we save off a copy of what we're blocking as
3436 * it may change while we're not holding the spin lock. */
3437 blocking
= lockres
->l_blocking
;
3438 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
3440 ctl
->unblock_action
= lockres
->l_ops
->downconvert_worker(lockres
, blocking
);
3442 if (ctl
->unblock_action
== UNBLOCK_STOP_POST
)
3445 spin_lock_irqsave(&lockres
->l_lock
, flags
);
3446 if (blocking
!= lockres
->l_blocking
) {
3447 /* If this changed underneath us, then we can't drop
3455 if (lockres
->l_ops
->flags
& LOCK_TYPE_USES_LVB
) {
3456 if (lockres
->l_level
== DLM_LOCK_EX
)
3460 * We only set the lvb if the lock has been fully
3461 * refreshed - otherwise we risk setting stale
3462 * data. Otherwise, there's no need to actually clear
3463 * out the lvb here as it's value is still valid.
3465 if (set_lvb
&& !(lockres
->l_flags
& OCFS2_LOCK_NEEDS_REFRESH
))
3466 lockres
->l_ops
->set_lvb(lockres
);
3469 gen
= ocfs2_prepare_downconvert(lockres
, new_level
);
3470 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
3471 ret
= ocfs2_downconvert_lock(osb
, lockres
, new_level
, set_lvb
,
3479 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
3486 static int ocfs2_data_convert_worker(struct ocfs2_lock_res
*lockres
,
3489 struct inode
*inode
;
3490 struct address_space
*mapping
;
3492 inode
= ocfs2_lock_res_inode(lockres
);
3493 mapping
= inode
->i_mapping
;
3495 if (!S_ISREG(inode
->i_mode
))
3499 * We need this before the filemap_fdatawrite() so that it can
3500 * transfer the dirty bit from the PTE to the
3501 * page. Unfortunately this means that even for EX->PR
3502 * downconverts, we'll lose our mappings and have to build
3505 unmap_mapping_range(mapping
, 0, 0, 0);
3507 if (filemap_fdatawrite(mapping
)) {
3508 mlog(ML_ERROR
, "Could not sync inode %llu for downconvert!",
3509 (unsigned long long)OCFS2_I(inode
)->ip_blkno
);
3511 sync_mapping_buffers(mapping
);
3512 if (blocking
== DLM_LOCK_EX
) {
3513 truncate_inode_pages(mapping
, 0);
3515 /* We only need to wait on the I/O if we're not also
3516 * truncating pages because truncate_inode_pages waits
3517 * for us above. We don't truncate pages if we're
3518 * blocking anything < EXMODE because we want to keep
3519 * them around in that case. */
3520 filemap_fdatawait(mapping
);
3524 return UNBLOCK_CONTINUE
;
3527 static int ocfs2_ci_checkpointed(struct ocfs2_caching_info
*ci
,
3528 struct ocfs2_lock_res
*lockres
,
3531 int checkpointed
= ocfs2_ci_fully_checkpointed(ci
);
3533 BUG_ON(new_level
!= DLM_LOCK_NL
&& new_level
!= DLM_LOCK_PR
);
3534 BUG_ON(lockres
->l_level
!= DLM_LOCK_EX
&& !checkpointed
);
3539 ocfs2_start_checkpoint(OCFS2_SB(ocfs2_metadata_cache_get_super(ci
)));
3543 static int ocfs2_check_meta_downconvert(struct ocfs2_lock_res
*lockres
,
3546 struct inode
*inode
= ocfs2_lock_res_inode(lockres
);
3548 return ocfs2_ci_checkpointed(INODE_CACHE(inode
), lockres
, new_level
);
3551 static void ocfs2_set_meta_lvb(struct ocfs2_lock_res
*lockres
)
3553 struct inode
*inode
= ocfs2_lock_res_inode(lockres
);
3555 __ocfs2_stuff_meta_lvb(inode
);
3559 * Does the final reference drop on our dentry lock. Right now this
3560 * happens in the downconvert thread, but we could choose to simplify the
3561 * dlmglue API and push these off to the ocfs2_wq in the future.
3563 static void ocfs2_dentry_post_unlock(struct ocfs2_super
*osb
,
3564 struct ocfs2_lock_res
*lockres
)
3566 struct ocfs2_dentry_lock
*dl
= ocfs2_lock_res_dl(lockres
);
3567 ocfs2_dentry_lock_put(osb
, dl
);
3571 * d_delete() matching dentries before the lock downconvert.
3573 * At this point, any process waiting to destroy the
3574 * dentry_lock due to last ref count is stopped by the
3575 * OCFS2_LOCK_QUEUED flag.
3577 * We have two potential problems
3579 * 1) If we do the last reference drop on our dentry_lock (via dput)
3580 * we'll wind up in ocfs2_release_dentry_lock(), waiting on
3581 * the downconvert to finish. Instead we take an elevated
3582 * reference and push the drop until after we've completed our
3583 * unblock processing.
3585 * 2) There might be another process with a final reference,
3586 * waiting on us to finish processing. If this is the case, we
3587 * detect it and exit out - there's no more dentries anyway.
3589 static int ocfs2_dentry_convert_worker(struct ocfs2_lock_res
*lockres
,
3592 struct ocfs2_dentry_lock
*dl
= ocfs2_lock_res_dl(lockres
);
3593 struct ocfs2_inode_info
*oi
= OCFS2_I(dl
->dl_inode
);
3594 struct dentry
*dentry
;
3595 unsigned long flags
;
3599 * This node is blocking another node from getting a read
3600 * lock. This happens when we've renamed within a
3601 * directory. We've forced the other nodes to d_delete(), but
3602 * we never actually dropped our lock because it's still
3603 * valid. The downconvert code will retain a PR for this node,
3604 * so there's no further work to do.
3606 if (blocking
== DLM_LOCK_PR
)
3607 return UNBLOCK_CONTINUE
;
3610 * Mark this inode as potentially orphaned. The code in
3611 * ocfs2_delete_inode() will figure out whether it actually
3612 * needs to be freed or not.
3614 spin_lock(&oi
->ip_lock
);
3615 oi
->ip_flags
|= OCFS2_INODE_MAYBE_ORPHANED
;
3616 spin_unlock(&oi
->ip_lock
);
3619 * Yuck. We need to make sure however that the check of
3620 * OCFS2_LOCK_FREEING and the extra reference are atomic with
3621 * respect to a reference decrement or the setting of that
3624 spin_lock_irqsave(&lockres
->l_lock
, flags
);
3625 spin_lock(&dentry_attach_lock
);
3626 if (!(lockres
->l_flags
& OCFS2_LOCK_FREEING
)
3631 spin_unlock(&dentry_attach_lock
);
3632 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
3634 mlog(0, "extra_ref = %d\n", extra_ref
);
3637 * We have a process waiting on us in ocfs2_dentry_iput(),
3638 * which means we can't have any more outstanding
3639 * aliases. There's no need to do any more work.
3642 return UNBLOCK_CONTINUE
;
3644 spin_lock(&dentry_attach_lock
);
3646 dentry
= ocfs2_find_local_alias(dl
->dl_inode
,
3647 dl
->dl_parent_blkno
, 1);
3650 spin_unlock(&dentry_attach_lock
);
3652 mlog(0, "d_delete(%.*s);\n", dentry
->d_name
.len
,
3653 dentry
->d_name
.name
);
3656 * The following dcache calls may do an
3657 * iput(). Normally we don't want that from the
3658 * downconverting thread, but in this case it's ok
3659 * because the requesting node already has an
3660 * exclusive lock on the inode, so it can't be queued
3661 * for a downconvert.
3666 spin_lock(&dentry_attach_lock
);
3668 spin_unlock(&dentry_attach_lock
);
3671 * If we are the last holder of this dentry lock, there is no
3672 * reason to downconvert so skip straight to the unlock.
3674 if (dl
->dl_count
== 1)
3675 return UNBLOCK_STOP_POST
;
3677 return UNBLOCK_CONTINUE_POST
;
3680 static int ocfs2_check_refcount_downconvert(struct ocfs2_lock_res
*lockres
,
3683 struct ocfs2_refcount_tree
*tree
=
3684 ocfs2_lock_res_refcount_tree(lockres
);
3686 return ocfs2_ci_checkpointed(&tree
->rf_ci
, lockres
, new_level
);
3689 static int ocfs2_refcount_convert_worker(struct ocfs2_lock_res
*lockres
,
3692 struct ocfs2_refcount_tree
*tree
=
3693 ocfs2_lock_res_refcount_tree(lockres
);
3695 ocfs2_metadata_cache_purge(&tree
->rf_ci
);
3697 return UNBLOCK_CONTINUE
;
3700 static void ocfs2_set_qinfo_lvb(struct ocfs2_lock_res
*lockres
)
3702 struct ocfs2_qinfo_lvb
*lvb
;
3703 struct ocfs2_mem_dqinfo
*oinfo
= ocfs2_lock_res_qinfo(lockres
);
3704 struct mem_dqinfo
*info
= sb_dqinfo(oinfo
->dqi_gi
.dqi_sb
,
3705 oinfo
->dqi_gi
.dqi_type
);
3709 lvb
= ocfs2_dlm_lvb(&lockres
->l_lksb
);
3710 lvb
->lvb_version
= OCFS2_QINFO_LVB_VERSION
;
3711 lvb
->lvb_bgrace
= cpu_to_be32(info
->dqi_bgrace
);
3712 lvb
->lvb_igrace
= cpu_to_be32(info
->dqi_igrace
);
3713 lvb
->lvb_syncms
= cpu_to_be32(oinfo
->dqi_syncms
);
3714 lvb
->lvb_blocks
= cpu_to_be32(oinfo
->dqi_gi
.dqi_blocks
);
3715 lvb
->lvb_free_blk
= cpu_to_be32(oinfo
->dqi_gi
.dqi_free_blk
);
3716 lvb
->lvb_free_entry
= cpu_to_be32(oinfo
->dqi_gi
.dqi_free_entry
);
3721 void ocfs2_qinfo_unlock(struct ocfs2_mem_dqinfo
*oinfo
, int ex
)
3723 struct ocfs2_lock_res
*lockres
= &oinfo
->dqi_gqlock
;
3724 struct ocfs2_super
*osb
= OCFS2_SB(oinfo
->dqi_gi
.dqi_sb
);
3725 int level
= ex
? DLM_LOCK_EX
: DLM_LOCK_PR
;
3728 if (!ocfs2_is_hard_readonly(osb
) && !ocfs2_mount_local(osb
))
3729 ocfs2_cluster_unlock(osb
, lockres
, level
);
3733 static int ocfs2_refresh_qinfo(struct ocfs2_mem_dqinfo
*oinfo
)
3735 struct mem_dqinfo
*info
= sb_dqinfo(oinfo
->dqi_gi
.dqi_sb
,
3736 oinfo
->dqi_gi
.dqi_type
);
3737 struct ocfs2_lock_res
*lockres
= &oinfo
->dqi_gqlock
;
3738 struct ocfs2_qinfo_lvb
*lvb
= ocfs2_dlm_lvb(&lockres
->l_lksb
);
3739 struct buffer_head
*bh
= NULL
;
3740 struct ocfs2_global_disk_dqinfo
*gdinfo
;
3743 if (ocfs2_dlm_lvb_valid(&lockres
->l_lksb
) &&
3744 lvb
->lvb_version
== OCFS2_QINFO_LVB_VERSION
) {
3745 info
->dqi_bgrace
= be32_to_cpu(lvb
->lvb_bgrace
);
3746 info
->dqi_igrace
= be32_to_cpu(lvb
->lvb_igrace
);
3747 oinfo
->dqi_syncms
= be32_to_cpu(lvb
->lvb_syncms
);
3748 oinfo
->dqi_gi
.dqi_blocks
= be32_to_cpu(lvb
->lvb_blocks
);
3749 oinfo
->dqi_gi
.dqi_free_blk
= be32_to_cpu(lvb
->lvb_free_blk
);
3750 oinfo
->dqi_gi
.dqi_free_entry
=
3751 be32_to_cpu(lvb
->lvb_free_entry
);
3753 status
= ocfs2_read_quota_block(oinfo
->dqi_gqinode
, 0, &bh
);
3758 gdinfo
= (struct ocfs2_global_disk_dqinfo
*)
3759 (bh
->b_data
+ OCFS2_GLOBAL_INFO_OFF
);
3760 info
->dqi_bgrace
= le32_to_cpu(gdinfo
->dqi_bgrace
);
3761 info
->dqi_igrace
= le32_to_cpu(gdinfo
->dqi_igrace
);
3762 oinfo
->dqi_syncms
= le32_to_cpu(gdinfo
->dqi_syncms
);
3763 oinfo
->dqi_gi
.dqi_blocks
= le32_to_cpu(gdinfo
->dqi_blocks
);
3764 oinfo
->dqi_gi
.dqi_free_blk
= le32_to_cpu(gdinfo
->dqi_free_blk
);
3765 oinfo
->dqi_gi
.dqi_free_entry
=
3766 le32_to_cpu(gdinfo
->dqi_free_entry
);
3768 ocfs2_track_lock_refresh(lockres
);
3775 /* Lock quota info, this function expects at least shared lock on the quota file
3776 * so that we can safely refresh quota info from disk. */
3777 int ocfs2_qinfo_lock(struct ocfs2_mem_dqinfo
*oinfo
, int ex
)
3779 struct ocfs2_lock_res
*lockres
= &oinfo
->dqi_gqlock
;
3780 struct ocfs2_super
*osb
= OCFS2_SB(oinfo
->dqi_gi
.dqi_sb
);
3781 int level
= ex
? DLM_LOCK_EX
: DLM_LOCK_PR
;
3786 /* On RO devices, locking really isn't needed... */
3787 if (ocfs2_is_hard_readonly(osb
)) {
3792 if (ocfs2_mount_local(osb
))
3795 status
= ocfs2_cluster_lock(osb
, lockres
, level
, 0, 0);
3800 if (!ocfs2_should_refresh_lock_res(lockres
))
3802 /* OK, we have the lock but we need to refresh the quota info */
3803 status
= ocfs2_refresh_qinfo(oinfo
);
3805 ocfs2_qinfo_unlock(oinfo
, ex
);
3806 ocfs2_complete_lock_res_refresh(lockres
, status
);
3812 int ocfs2_refcount_lock(struct ocfs2_refcount_tree
*ref_tree
, int ex
)
3815 int level
= ex
? DLM_LOCK_EX
: DLM_LOCK_PR
;
3816 struct ocfs2_lock_res
*lockres
= &ref_tree
->rf_lockres
;
3817 struct ocfs2_super
*osb
= lockres
->l_priv
;
3820 if (ocfs2_is_hard_readonly(osb
))
3823 if (ocfs2_mount_local(osb
))
3826 status
= ocfs2_cluster_lock(osb
, lockres
, level
, 0, 0);
3833 void ocfs2_refcount_unlock(struct ocfs2_refcount_tree
*ref_tree
, int ex
)
3835 int level
= ex
? DLM_LOCK_EX
: DLM_LOCK_PR
;
3836 struct ocfs2_lock_res
*lockres
= &ref_tree
->rf_lockres
;
3837 struct ocfs2_super
*osb
= lockres
->l_priv
;
3839 if (!ocfs2_mount_local(osb
))
3840 ocfs2_cluster_unlock(osb
, lockres
, level
);
3844 * This is the filesystem locking protocol. It provides the lock handling
3845 * hooks for the underlying DLM. It has a maximum version number.
3846 * The version number allows interoperability with systems running at
3847 * the same major number and an equal or smaller minor number.
3849 * Whenever the filesystem does new things with locks (adds or removes a
3850 * lock, orders them differently, does different things underneath a lock),
3851 * the version must be changed. The protocol is negotiated when joining
3852 * the dlm domain. A node may join the domain if its major version is
3853 * identical to all other nodes and its minor version is greater than
3854 * or equal to all other nodes. When its minor version is greater than
3855 * the other nodes, it will run at the minor version specified by the
3858 * If a locking change is made that will not be compatible with older
3859 * versions, the major number must be increased and the minor version set
3860 * to zero. If a change merely adds a behavior that can be disabled when
3861 * speaking to older versions, the minor version must be increased. If a
3862 * change adds a fully backwards compatible change (eg, LVB changes that
3863 * are just ignored by older versions), the version does not need to be
3866 static struct ocfs2_locking_protocol lproto
= {
3868 .pv_major
= OCFS2_LOCKING_PROTOCOL_MAJOR
,
3869 .pv_minor
= OCFS2_LOCKING_PROTOCOL_MINOR
,
3871 .lp_lock_ast
= ocfs2_locking_ast
,
3872 .lp_blocking_ast
= ocfs2_blocking_ast
,
3873 .lp_unlock_ast
= ocfs2_unlock_ast
,
3876 void ocfs2_set_locking_protocol(void)
3878 ocfs2_stack_glue_set_locking_protocol(&lproto
);
3882 static void ocfs2_process_blocked_lock(struct ocfs2_super
*osb
,
3883 struct ocfs2_lock_res
*lockres
)
3886 struct ocfs2_unblock_ctl ctl
= {0, 0,};
3887 unsigned long flags
;
3889 /* Our reference to the lockres in this function can be
3890 * considered valid until we remove the OCFS2_LOCK_QUEUED
3896 BUG_ON(!lockres
->l_ops
);
3898 mlog(0, "lockres %s blocked.\n", lockres
->l_name
);
3900 /* Detect whether a lock has been marked as going away while
3901 * the downconvert thread was processing other things. A lock can
3902 * still be marked with OCFS2_LOCK_FREEING after this check,
3903 * but short circuiting here will still save us some
3905 spin_lock_irqsave(&lockres
->l_lock
, flags
);
3906 if (lockres
->l_flags
& OCFS2_LOCK_FREEING
)
3908 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
3910 status
= ocfs2_unblock_lock(osb
, lockres
, &ctl
);
3914 spin_lock_irqsave(&lockres
->l_lock
, flags
);
3916 if (lockres
->l_flags
& OCFS2_LOCK_FREEING
|| !ctl
.requeue
) {
3917 lockres_clear_flags(lockres
, OCFS2_LOCK_QUEUED
);
3919 ocfs2_schedule_blocked_lock(osb
, lockres
);
3921 mlog(0, "lockres %s, requeue = %s.\n", lockres
->l_name
,
3922 ctl
.requeue
? "yes" : "no");
3923 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
3925 if (ctl
.unblock_action
!= UNBLOCK_CONTINUE
3926 && lockres
->l_ops
->post_unlock
)
3927 lockres
->l_ops
->post_unlock(osb
, lockres
);
3932 static void ocfs2_schedule_blocked_lock(struct ocfs2_super
*osb
,
3933 struct ocfs2_lock_res
*lockres
)
3937 assert_spin_locked(&lockres
->l_lock
);
3939 if (lockres
->l_flags
& OCFS2_LOCK_FREEING
) {
3940 /* Do not schedule a lock for downconvert when it's on
3941 * the way to destruction - any nodes wanting access
3942 * to the resource will get it soon. */
3943 mlog(0, "Lockres %s won't be scheduled: flags 0x%lx\n",
3944 lockres
->l_name
, lockres
->l_flags
);
3948 lockres_or_flags(lockres
, OCFS2_LOCK_QUEUED
);
3950 spin_lock(&osb
->dc_task_lock
);
3951 if (list_empty(&lockres
->l_blocked_list
)) {
3952 list_add_tail(&lockres
->l_blocked_list
,
3953 &osb
->blocked_lock_list
);
3954 osb
->blocked_lock_count
++;
3956 spin_unlock(&osb
->dc_task_lock
);
3961 static void ocfs2_downconvert_thread_do_work(struct ocfs2_super
*osb
)
3963 unsigned long processed
;
3964 struct ocfs2_lock_res
*lockres
;
3968 spin_lock(&osb
->dc_task_lock
);
3969 /* grab this early so we know to try again if a state change and
3970 * wake happens part-way through our work */
3971 osb
->dc_work_sequence
= osb
->dc_wake_sequence
;
3973 processed
= osb
->blocked_lock_count
;
3975 BUG_ON(list_empty(&osb
->blocked_lock_list
));
3977 lockres
= list_entry(osb
->blocked_lock_list
.next
,
3978 struct ocfs2_lock_res
, l_blocked_list
);
3979 list_del_init(&lockres
->l_blocked_list
);
3980 osb
->blocked_lock_count
--;
3981 spin_unlock(&osb
->dc_task_lock
);
3986 ocfs2_process_blocked_lock(osb
, lockres
);
3988 spin_lock(&osb
->dc_task_lock
);
3990 spin_unlock(&osb
->dc_task_lock
);
3995 static int ocfs2_downconvert_thread_lists_empty(struct ocfs2_super
*osb
)
3999 spin_lock(&osb
->dc_task_lock
);
4000 if (list_empty(&osb
->blocked_lock_list
))
4003 spin_unlock(&osb
->dc_task_lock
);
4007 static int ocfs2_downconvert_thread_should_wake(struct ocfs2_super
*osb
)
4009 int should_wake
= 0;
4011 spin_lock(&osb
->dc_task_lock
);
4012 if (osb
->dc_work_sequence
!= osb
->dc_wake_sequence
)
4014 spin_unlock(&osb
->dc_task_lock
);
4019 static int ocfs2_downconvert_thread(void *arg
)
4022 struct ocfs2_super
*osb
= arg
;
4024 /* only quit once we've been asked to stop and there is no more
4026 while (!(kthread_should_stop() &&
4027 ocfs2_downconvert_thread_lists_empty(osb
))) {
4029 wait_event_interruptible(osb
->dc_event
,
4030 ocfs2_downconvert_thread_should_wake(osb
) ||
4031 kthread_should_stop());
4033 mlog(0, "downconvert_thread: awoken\n");
4035 ocfs2_downconvert_thread_do_work(osb
);
4038 osb
->dc_task
= NULL
;
4042 void ocfs2_wake_downconvert_thread(struct ocfs2_super
*osb
)
4044 spin_lock(&osb
->dc_task_lock
);
4045 /* make sure the voting thread gets a swipe at whatever changes
4046 * the caller may have made to the voting state */
4047 osb
->dc_wake_sequence
++;
4048 spin_unlock(&osb
->dc_task_lock
);
4049 wake_up(&osb
->dc_event
);