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/crc32.h>
31 #include <linux/kthread.h>
32 #include <linux/pagemap.h>
33 #include <linux/debugfs.h>
34 #include <linux/seq_file.h>
36 #include <cluster/heartbeat.h>
37 #include <cluster/nodemanager.h>
38 #include <cluster/tcp.h>
40 #include <dlm/dlmapi.h>
42 #define MLOG_MASK_PREFIX ML_DLM_GLUE
43 #include <cluster/masklog.h>
50 #include "extent_map.h"
52 #include "heartbeat.h"
59 #include "buffer_head_io.h"
61 struct ocfs2_mask_waiter
{
62 struct list_head mw_item
;
64 struct completion mw_complete
;
65 unsigned long mw_mask
;
66 unsigned long mw_goal
;
69 static struct ocfs2_super
*ocfs2_get_dentry_osb(struct ocfs2_lock_res
*lockres
);
70 static struct ocfs2_super
*ocfs2_get_inode_osb(struct ocfs2_lock_res
*lockres
);
73 * Return value from ->downconvert_worker functions.
75 * These control the precise actions of ocfs2_unblock_lock()
76 * and ocfs2_process_blocked_lock()
79 enum ocfs2_unblock_action
{
80 UNBLOCK_CONTINUE
= 0, /* Continue downconvert */
81 UNBLOCK_CONTINUE_POST
= 1, /* Continue downconvert, fire
82 * ->post_unlock callback */
83 UNBLOCK_STOP_POST
= 2, /* Do not downconvert, fire
84 * ->post_unlock() callback. */
87 struct ocfs2_unblock_ctl
{
89 enum ocfs2_unblock_action unblock_action
;
92 static int ocfs2_check_meta_downconvert(struct ocfs2_lock_res
*lockres
,
94 static void ocfs2_set_meta_lvb(struct ocfs2_lock_res
*lockres
);
96 static int ocfs2_data_convert_worker(struct ocfs2_lock_res
*lockres
,
99 static int ocfs2_dentry_convert_worker(struct ocfs2_lock_res
*lockres
,
102 static void ocfs2_dentry_post_unlock(struct ocfs2_super
*osb
,
103 struct ocfs2_lock_res
*lockres
);
106 #define mlog_meta_lvb(__level, __lockres) ocfs2_dump_meta_lvb_info(__level, __PRETTY_FUNCTION__, __LINE__, __lockres)
108 /* This aids in debugging situations where a bad LVB might be involved. */
109 static void ocfs2_dump_meta_lvb_info(u64 level
,
110 const char *function
,
112 struct ocfs2_lock_res
*lockres
)
114 struct ocfs2_meta_lvb
*lvb
= (struct ocfs2_meta_lvb
*) lockres
->l_lksb
.lvb
;
116 mlog(level
, "LVB information for %s (called from %s:%u):\n",
117 lockres
->l_name
, function
, line
);
118 mlog(level
, "version: %u, clusters: %u, generation: 0x%x\n",
119 lvb
->lvb_version
, be32_to_cpu(lvb
->lvb_iclusters
),
120 be32_to_cpu(lvb
->lvb_igeneration
));
121 mlog(level
, "size: %llu, uid %u, gid %u, mode 0x%x\n",
122 (unsigned long long)be64_to_cpu(lvb
->lvb_isize
),
123 be32_to_cpu(lvb
->lvb_iuid
), be32_to_cpu(lvb
->lvb_igid
),
124 be16_to_cpu(lvb
->lvb_imode
));
125 mlog(level
, "nlink %u, atime_packed 0x%llx, ctime_packed 0x%llx, "
126 "mtime_packed 0x%llx iattr 0x%x\n", be16_to_cpu(lvb
->lvb_inlink
),
127 (long long)be64_to_cpu(lvb
->lvb_iatime_packed
),
128 (long long)be64_to_cpu(lvb
->lvb_ictime_packed
),
129 (long long)be64_to_cpu(lvb
->lvb_imtime_packed
),
130 be32_to_cpu(lvb
->lvb_iattr
));
135 * OCFS2 Lock Resource Operations
137 * These fine tune the behavior of the generic dlmglue locking infrastructure.
139 * The most basic of lock types can point ->l_priv to their respective
140 * struct ocfs2_super and allow the default actions to manage things.
142 * Right now, each lock type also needs to implement an init function,
143 * and trivial lock/unlock wrappers. ocfs2_simple_drop_lockres()
144 * should be called when the lock is no longer needed (i.e., object
147 struct ocfs2_lock_res_ops
{
149 * Translate an ocfs2_lock_res * into an ocfs2_super *. Define
150 * this callback if ->l_priv is not an ocfs2_super pointer
152 struct ocfs2_super
* (*get_osb
)(struct ocfs2_lock_res
*);
155 * Optionally called in the downconvert thread after a
156 * successful downconvert. The lockres will not be referenced
157 * after this callback is called, so it is safe to free
160 * The exact semantics of when this is called are controlled
161 * by ->downconvert_worker()
163 void (*post_unlock
)(struct ocfs2_super
*, struct ocfs2_lock_res
*);
166 * Allow a lock type to add checks to determine whether it is
167 * safe to downconvert a lock. Return 0 to re-queue the
168 * downconvert at a later time, nonzero to continue.
170 * For most locks, the default checks that there are no
171 * incompatible holders are sufficient.
173 * Called with the lockres spinlock held.
175 int (*check_downconvert
)(struct ocfs2_lock_res
*, int);
178 * Allows a lock type to populate the lock value block. This
179 * is called on downconvert, and when we drop a lock.
181 * Locks that want to use this should set LOCK_TYPE_USES_LVB
182 * in the flags field.
184 * Called with the lockres spinlock held.
186 void (*set_lvb
)(struct ocfs2_lock_res
*);
189 * Called from the downconvert thread when it is determined
190 * that a lock will be downconverted. This is called without
191 * any locks held so the function can do work that might
192 * schedule (syncing out data, etc).
194 * This should return any one of the ocfs2_unblock_action
195 * values, depending on what it wants the thread to do.
197 int (*downconvert_worker
)(struct ocfs2_lock_res
*, int);
200 * LOCK_TYPE_* flags which describe the specific requirements
201 * of a lock type. Descriptions of each individual flag follow.
207 * Some locks want to "refresh" potentially stale data when a
208 * meaningful (PRMODE or EXMODE) lock level is first obtained. If this
209 * flag is set, the OCFS2_LOCK_NEEDS_REFRESH flag will be set on the
210 * individual lockres l_flags member from the ast function. It is
211 * expected that the locking wrapper will clear the
212 * OCFS2_LOCK_NEEDS_REFRESH flag when done.
214 #define LOCK_TYPE_REQUIRES_REFRESH 0x1
217 * Indicate that a lock type makes use of the lock value block. The
218 * ->set_lvb lock type callback must be defined.
220 #define LOCK_TYPE_USES_LVB 0x2
222 static struct ocfs2_lock_res_ops ocfs2_inode_rw_lops
= {
223 .get_osb
= ocfs2_get_inode_osb
,
227 static struct ocfs2_lock_res_ops ocfs2_inode_inode_lops
= {
228 .get_osb
= ocfs2_get_inode_osb
,
229 .check_downconvert
= ocfs2_check_meta_downconvert
,
230 .set_lvb
= ocfs2_set_meta_lvb
,
231 .downconvert_worker
= ocfs2_data_convert_worker
,
232 .flags
= LOCK_TYPE_REQUIRES_REFRESH
|LOCK_TYPE_USES_LVB
,
235 static struct ocfs2_lock_res_ops ocfs2_super_lops
= {
236 .flags
= LOCK_TYPE_REQUIRES_REFRESH
,
239 static struct ocfs2_lock_res_ops ocfs2_rename_lops
= {
243 static struct ocfs2_lock_res_ops ocfs2_dentry_lops
= {
244 .get_osb
= ocfs2_get_dentry_osb
,
245 .post_unlock
= ocfs2_dentry_post_unlock
,
246 .downconvert_worker
= ocfs2_dentry_convert_worker
,
250 static struct ocfs2_lock_res_ops ocfs2_inode_open_lops
= {
251 .get_osb
= ocfs2_get_inode_osb
,
255 static inline int ocfs2_is_inode_lock(struct ocfs2_lock_res
*lockres
)
257 return lockres
->l_type
== OCFS2_LOCK_TYPE_META
||
258 lockres
->l_type
== OCFS2_LOCK_TYPE_RW
||
259 lockres
->l_type
== OCFS2_LOCK_TYPE_OPEN
;
262 static inline struct inode
*ocfs2_lock_res_inode(struct ocfs2_lock_res
*lockres
)
264 BUG_ON(!ocfs2_is_inode_lock(lockres
));
266 return (struct inode
*) lockres
->l_priv
;
269 static inline struct ocfs2_dentry_lock
*ocfs2_lock_res_dl(struct ocfs2_lock_res
*lockres
)
271 BUG_ON(lockres
->l_type
!= OCFS2_LOCK_TYPE_DENTRY
);
273 return (struct ocfs2_dentry_lock
*)lockres
->l_priv
;
276 static inline struct ocfs2_super
*ocfs2_get_lockres_osb(struct ocfs2_lock_res
*lockres
)
278 if (lockres
->l_ops
->get_osb
)
279 return lockres
->l_ops
->get_osb(lockres
);
281 return (struct ocfs2_super
*)lockres
->l_priv
;
284 static int ocfs2_lock_create(struct ocfs2_super
*osb
,
285 struct ocfs2_lock_res
*lockres
,
288 static inline int ocfs2_may_continue_on_blocked_lock(struct ocfs2_lock_res
*lockres
,
290 static void ocfs2_cluster_unlock(struct ocfs2_super
*osb
,
291 struct ocfs2_lock_res
*lockres
,
293 static inline void ocfs2_generic_handle_downconvert_action(struct ocfs2_lock_res
*lockres
);
294 static inline void ocfs2_generic_handle_convert_action(struct ocfs2_lock_res
*lockres
);
295 static inline void ocfs2_generic_handle_attach_action(struct ocfs2_lock_res
*lockres
);
296 static int ocfs2_generic_handle_bast(struct ocfs2_lock_res
*lockres
, int level
);
297 static void ocfs2_schedule_blocked_lock(struct ocfs2_super
*osb
,
298 struct ocfs2_lock_res
*lockres
);
299 static inline void ocfs2_recover_from_dlm_error(struct ocfs2_lock_res
*lockres
,
301 #define ocfs2_log_dlm_error(_func, _stat, _lockres) do { \
302 mlog(ML_ERROR, "Dlm error \"%s\" while calling %s on " \
303 "resource %s: %s\n", dlm_errname(_stat), _func, \
304 _lockres->l_name, dlm_errmsg(_stat)); \
306 static int ocfs2_downconvert_thread(void *arg
);
307 static void ocfs2_downconvert_on_unlock(struct ocfs2_super
*osb
,
308 struct ocfs2_lock_res
*lockres
);
309 static int ocfs2_inode_lock_update(struct inode
*inode
,
310 struct buffer_head
**bh
);
311 static void ocfs2_drop_osb_locks(struct ocfs2_super
*osb
);
312 static inline int ocfs2_highest_compat_lock_level(int level
);
314 static void ocfs2_build_lock_name(enum ocfs2_lock_type type
,
323 BUG_ON(type
>= OCFS2_NUM_LOCK_TYPES
);
325 len
= snprintf(name
, OCFS2_LOCK_ID_MAX_LEN
, "%c%s%016llx%08x",
326 ocfs2_lock_type_char(type
), OCFS2_LOCK_ID_PAD
,
327 (long long)blkno
, generation
);
329 BUG_ON(len
!= (OCFS2_LOCK_ID_MAX_LEN
- 1));
331 mlog(0, "built lock resource with name: %s\n", name
);
336 static DEFINE_SPINLOCK(ocfs2_dlm_tracking_lock
);
338 static void ocfs2_add_lockres_tracking(struct ocfs2_lock_res
*res
,
339 struct ocfs2_dlm_debug
*dlm_debug
)
341 mlog(0, "Add tracking for lockres %s\n", res
->l_name
);
343 spin_lock(&ocfs2_dlm_tracking_lock
);
344 list_add(&res
->l_debug_list
, &dlm_debug
->d_lockres_tracking
);
345 spin_unlock(&ocfs2_dlm_tracking_lock
);
348 static void ocfs2_remove_lockres_tracking(struct ocfs2_lock_res
*res
)
350 spin_lock(&ocfs2_dlm_tracking_lock
);
351 if (!list_empty(&res
->l_debug_list
))
352 list_del_init(&res
->l_debug_list
);
353 spin_unlock(&ocfs2_dlm_tracking_lock
);
356 static void ocfs2_lock_res_init_common(struct ocfs2_super
*osb
,
357 struct ocfs2_lock_res
*res
,
358 enum ocfs2_lock_type type
,
359 struct ocfs2_lock_res_ops
*ops
,
366 res
->l_level
= LKM_IVMODE
;
367 res
->l_requested
= LKM_IVMODE
;
368 res
->l_blocking
= LKM_IVMODE
;
369 res
->l_action
= OCFS2_AST_INVALID
;
370 res
->l_unlock_action
= OCFS2_UNLOCK_INVALID
;
372 res
->l_flags
= OCFS2_LOCK_INITIALIZED
;
374 ocfs2_add_lockres_tracking(res
, osb
->osb_dlm_debug
);
377 void ocfs2_lock_res_init_once(struct ocfs2_lock_res
*res
)
379 /* This also clears out the lock status block */
380 memset(res
, 0, sizeof(struct ocfs2_lock_res
));
381 spin_lock_init(&res
->l_lock
);
382 init_waitqueue_head(&res
->l_event
);
383 INIT_LIST_HEAD(&res
->l_blocked_list
);
384 INIT_LIST_HEAD(&res
->l_mask_waiters
);
387 void ocfs2_inode_lock_res_init(struct ocfs2_lock_res
*res
,
388 enum ocfs2_lock_type type
,
389 unsigned int generation
,
392 struct ocfs2_lock_res_ops
*ops
;
395 case OCFS2_LOCK_TYPE_RW
:
396 ops
= &ocfs2_inode_rw_lops
;
398 case OCFS2_LOCK_TYPE_META
:
399 ops
= &ocfs2_inode_inode_lops
;
401 case OCFS2_LOCK_TYPE_OPEN
:
402 ops
= &ocfs2_inode_open_lops
;
405 mlog_bug_on_msg(1, "type: %d\n", type
);
406 ops
= NULL
; /* thanks, gcc */
410 ocfs2_build_lock_name(type
, OCFS2_I(inode
)->ip_blkno
,
411 generation
, res
->l_name
);
412 ocfs2_lock_res_init_common(OCFS2_SB(inode
->i_sb
), res
, type
, ops
, inode
);
415 static struct ocfs2_super
*ocfs2_get_inode_osb(struct ocfs2_lock_res
*lockres
)
417 struct inode
*inode
= ocfs2_lock_res_inode(lockres
);
419 return OCFS2_SB(inode
->i_sb
);
422 static __u64
ocfs2_get_dentry_lock_ino(struct ocfs2_lock_res
*lockres
)
424 __be64 inode_blkno_be
;
426 memcpy(&inode_blkno_be
, &lockres
->l_name
[OCFS2_DENTRY_LOCK_INO_START
],
429 return be64_to_cpu(inode_blkno_be
);
432 static struct ocfs2_super
*ocfs2_get_dentry_osb(struct ocfs2_lock_res
*lockres
)
434 struct ocfs2_dentry_lock
*dl
= lockres
->l_priv
;
436 return OCFS2_SB(dl
->dl_inode
->i_sb
);
439 void ocfs2_dentry_lock_res_init(struct ocfs2_dentry_lock
*dl
,
440 u64 parent
, struct inode
*inode
)
443 u64 inode_blkno
= OCFS2_I(inode
)->ip_blkno
;
444 __be64 inode_blkno_be
= cpu_to_be64(inode_blkno
);
445 struct ocfs2_lock_res
*lockres
= &dl
->dl_lockres
;
447 ocfs2_lock_res_init_once(lockres
);
450 * Unfortunately, the standard lock naming scheme won't work
451 * here because we have two 16 byte values to use. Instead,
452 * we'll stuff the inode number as a binary value. We still
453 * want error prints to show something without garbling the
454 * display, so drop a null byte in there before the inode
455 * number. A future version of OCFS2 will likely use all
456 * binary lock names. The stringified names have been a
457 * tremendous aid in debugging, but now that the debugfs
458 * interface exists, we can mangle things there if need be.
460 * NOTE: We also drop the standard "pad" value (the total lock
461 * name size stays the same though - the last part is all
462 * zeros due to the memset in ocfs2_lock_res_init_once()
464 len
= snprintf(lockres
->l_name
, OCFS2_DENTRY_LOCK_INO_START
,
466 ocfs2_lock_type_char(OCFS2_LOCK_TYPE_DENTRY
),
469 BUG_ON(len
!= (OCFS2_DENTRY_LOCK_INO_START
- 1));
471 memcpy(&lockres
->l_name
[OCFS2_DENTRY_LOCK_INO_START
], &inode_blkno_be
,
474 ocfs2_lock_res_init_common(OCFS2_SB(inode
->i_sb
), lockres
,
475 OCFS2_LOCK_TYPE_DENTRY
, &ocfs2_dentry_lops
,
479 static void ocfs2_super_lock_res_init(struct ocfs2_lock_res
*res
,
480 struct ocfs2_super
*osb
)
482 /* Superblock lockres doesn't come from a slab so we call init
483 * once on it manually. */
484 ocfs2_lock_res_init_once(res
);
485 ocfs2_build_lock_name(OCFS2_LOCK_TYPE_SUPER
, OCFS2_SUPER_BLOCK_BLKNO
,
487 ocfs2_lock_res_init_common(osb
, res
, OCFS2_LOCK_TYPE_SUPER
,
488 &ocfs2_super_lops
, osb
);
491 static void ocfs2_rename_lock_res_init(struct ocfs2_lock_res
*res
,
492 struct ocfs2_super
*osb
)
494 /* Rename lockres doesn't come from a slab so we call init
495 * once on it manually. */
496 ocfs2_lock_res_init_once(res
);
497 ocfs2_build_lock_name(OCFS2_LOCK_TYPE_RENAME
, 0, 0, res
->l_name
);
498 ocfs2_lock_res_init_common(osb
, res
, OCFS2_LOCK_TYPE_RENAME
,
499 &ocfs2_rename_lops
, osb
);
502 void ocfs2_lock_res_free(struct ocfs2_lock_res
*res
)
506 if (!(res
->l_flags
& OCFS2_LOCK_INITIALIZED
))
509 ocfs2_remove_lockres_tracking(res
);
511 mlog_bug_on_msg(!list_empty(&res
->l_blocked_list
),
512 "Lockres %s is on the blocked list\n",
514 mlog_bug_on_msg(!list_empty(&res
->l_mask_waiters
),
515 "Lockres %s has mask waiters pending\n",
517 mlog_bug_on_msg(spin_is_locked(&res
->l_lock
),
518 "Lockres %s is locked\n",
520 mlog_bug_on_msg(res
->l_ro_holders
,
521 "Lockres %s has %u ro holders\n",
522 res
->l_name
, res
->l_ro_holders
);
523 mlog_bug_on_msg(res
->l_ex_holders
,
524 "Lockres %s has %u ex holders\n",
525 res
->l_name
, res
->l_ex_holders
);
527 /* Need to clear out the lock status block for the dlm */
528 memset(&res
->l_lksb
, 0, sizeof(res
->l_lksb
));
534 static inline void ocfs2_inc_holders(struct ocfs2_lock_res
*lockres
,
543 lockres
->l_ex_holders
++;
546 lockres
->l_ro_holders
++;
555 static inline void ocfs2_dec_holders(struct ocfs2_lock_res
*lockres
,
564 BUG_ON(!lockres
->l_ex_holders
);
565 lockres
->l_ex_holders
--;
568 BUG_ON(!lockres
->l_ro_holders
);
569 lockres
->l_ro_holders
--;
577 /* WARNING: This function lives in a world where the only three lock
578 * levels are EX, PR, and NL. It *will* have to be adjusted when more
579 * lock types are added. */
580 static inline int ocfs2_highest_compat_lock_level(int level
)
582 int new_level
= LKM_EXMODE
;
584 if (level
== LKM_EXMODE
)
585 new_level
= LKM_NLMODE
;
586 else if (level
== LKM_PRMODE
)
587 new_level
= LKM_PRMODE
;
591 static void lockres_set_flags(struct ocfs2_lock_res
*lockres
,
592 unsigned long newflags
)
594 struct ocfs2_mask_waiter
*mw
, *tmp
;
596 assert_spin_locked(&lockres
->l_lock
);
598 lockres
->l_flags
= newflags
;
600 list_for_each_entry_safe(mw
, tmp
, &lockres
->l_mask_waiters
, mw_item
) {
601 if ((lockres
->l_flags
& mw
->mw_mask
) != mw
->mw_goal
)
604 list_del_init(&mw
->mw_item
);
606 complete(&mw
->mw_complete
);
609 static void lockres_or_flags(struct ocfs2_lock_res
*lockres
, unsigned long or)
611 lockres_set_flags(lockres
, lockres
->l_flags
| or);
613 static void lockres_clear_flags(struct ocfs2_lock_res
*lockres
,
616 lockres_set_flags(lockres
, lockres
->l_flags
& ~clear
);
619 static inline void ocfs2_generic_handle_downconvert_action(struct ocfs2_lock_res
*lockres
)
623 BUG_ON(!(lockres
->l_flags
& OCFS2_LOCK_BUSY
));
624 BUG_ON(!(lockres
->l_flags
& OCFS2_LOCK_ATTACHED
));
625 BUG_ON(!(lockres
->l_flags
& OCFS2_LOCK_BLOCKED
));
626 BUG_ON(lockres
->l_blocking
<= LKM_NLMODE
);
628 lockres
->l_level
= lockres
->l_requested
;
629 if (lockres
->l_level
<=
630 ocfs2_highest_compat_lock_level(lockres
->l_blocking
)) {
631 lockres
->l_blocking
= LKM_NLMODE
;
632 lockres_clear_flags(lockres
, OCFS2_LOCK_BLOCKED
);
634 lockres_clear_flags(lockres
, OCFS2_LOCK_BUSY
);
639 static inline void ocfs2_generic_handle_convert_action(struct ocfs2_lock_res
*lockres
)
643 BUG_ON(!(lockres
->l_flags
& OCFS2_LOCK_BUSY
));
644 BUG_ON(!(lockres
->l_flags
& OCFS2_LOCK_ATTACHED
));
646 /* Convert from RO to EX doesn't really need anything as our
647 * information is already up to data. Convert from NL to
648 * *anything* however should mark ourselves as needing an
650 if (lockres
->l_level
== LKM_NLMODE
&&
651 lockres
->l_ops
->flags
& LOCK_TYPE_REQUIRES_REFRESH
)
652 lockres_or_flags(lockres
, OCFS2_LOCK_NEEDS_REFRESH
);
654 lockres
->l_level
= lockres
->l_requested
;
655 lockres_clear_flags(lockres
, OCFS2_LOCK_BUSY
);
660 static inline void ocfs2_generic_handle_attach_action(struct ocfs2_lock_res
*lockres
)
664 BUG_ON((!(lockres
->l_flags
& OCFS2_LOCK_BUSY
)));
665 BUG_ON(lockres
->l_flags
& OCFS2_LOCK_ATTACHED
);
667 if (lockres
->l_requested
> LKM_NLMODE
&&
668 !(lockres
->l_flags
& OCFS2_LOCK_LOCAL
) &&
669 lockres
->l_ops
->flags
& LOCK_TYPE_REQUIRES_REFRESH
)
670 lockres_or_flags(lockres
, OCFS2_LOCK_NEEDS_REFRESH
);
672 lockres
->l_level
= lockres
->l_requested
;
673 lockres_or_flags(lockres
, OCFS2_LOCK_ATTACHED
);
674 lockres_clear_flags(lockres
, OCFS2_LOCK_BUSY
);
679 static int ocfs2_generic_handle_bast(struct ocfs2_lock_res
*lockres
,
682 int needs_downconvert
= 0;
685 assert_spin_locked(&lockres
->l_lock
);
687 lockres_or_flags(lockres
, OCFS2_LOCK_BLOCKED
);
689 if (level
> lockres
->l_blocking
) {
690 /* only schedule a downconvert if we haven't already scheduled
691 * one that goes low enough to satisfy the level we're
692 * blocking. this also catches the case where we get
694 if (ocfs2_highest_compat_lock_level(level
) <
695 ocfs2_highest_compat_lock_level(lockres
->l_blocking
))
696 needs_downconvert
= 1;
698 lockres
->l_blocking
= level
;
701 mlog_exit(needs_downconvert
);
702 return needs_downconvert
;
705 static void ocfs2_blocking_ast(void *opaque
, int level
)
707 struct ocfs2_lock_res
*lockres
= opaque
;
708 struct ocfs2_super
*osb
= ocfs2_get_lockres_osb(lockres
);
709 int needs_downconvert
;
712 BUG_ON(level
<= LKM_NLMODE
);
714 mlog(0, "BAST fired for lockres %s, blocking %d, level %d type %s\n",
715 lockres
->l_name
, level
, lockres
->l_level
,
716 ocfs2_lock_type_string(lockres
->l_type
));
718 spin_lock_irqsave(&lockres
->l_lock
, flags
);
719 needs_downconvert
= ocfs2_generic_handle_bast(lockres
, level
);
720 if (needs_downconvert
)
721 ocfs2_schedule_blocked_lock(osb
, lockres
);
722 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
724 wake_up(&lockres
->l_event
);
726 ocfs2_wake_downconvert_thread(osb
);
729 static void ocfs2_locking_ast(void *opaque
)
731 struct ocfs2_lock_res
*lockres
= opaque
;
732 struct dlm_lockstatus
*lksb
= &lockres
->l_lksb
;
735 spin_lock_irqsave(&lockres
->l_lock
, flags
);
737 if (lksb
->status
!= DLM_NORMAL
) {
738 mlog(ML_ERROR
, "lockres %s: lksb status value of %u!\n",
739 lockres
->l_name
, lksb
->status
);
740 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
744 switch(lockres
->l_action
) {
745 case OCFS2_AST_ATTACH
:
746 ocfs2_generic_handle_attach_action(lockres
);
747 lockres_clear_flags(lockres
, OCFS2_LOCK_LOCAL
);
749 case OCFS2_AST_CONVERT
:
750 ocfs2_generic_handle_convert_action(lockres
);
752 case OCFS2_AST_DOWNCONVERT
:
753 ocfs2_generic_handle_downconvert_action(lockres
);
756 mlog(ML_ERROR
, "lockres %s: ast fired with invalid action: %u "
757 "lockres flags = 0x%lx, unlock action: %u\n",
758 lockres
->l_name
, lockres
->l_action
, lockres
->l_flags
,
759 lockres
->l_unlock_action
);
763 /* set it to something invalid so if we get called again we
765 lockres
->l_action
= OCFS2_AST_INVALID
;
767 wake_up(&lockres
->l_event
);
768 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
771 static inline void ocfs2_recover_from_dlm_error(struct ocfs2_lock_res
*lockres
,
777 spin_lock_irqsave(&lockres
->l_lock
, flags
);
778 lockres_clear_flags(lockres
, OCFS2_LOCK_BUSY
);
780 lockres
->l_action
= OCFS2_AST_INVALID
;
782 lockres
->l_unlock_action
= OCFS2_UNLOCK_INVALID
;
783 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
785 wake_up(&lockres
->l_event
);
789 /* Note: If we detect another process working on the lock (i.e.,
790 * OCFS2_LOCK_BUSY), we'll bail out returning 0. It's up to the caller
791 * to do the right thing in that case.
793 static int ocfs2_lock_create(struct ocfs2_super
*osb
,
794 struct ocfs2_lock_res
*lockres
,
799 enum dlm_status status
= DLM_NORMAL
;
804 mlog(0, "lock %s, level = %d, flags = %d\n", lockres
->l_name
, level
,
807 spin_lock_irqsave(&lockres
->l_lock
, flags
);
808 if ((lockres
->l_flags
& OCFS2_LOCK_ATTACHED
) ||
809 (lockres
->l_flags
& OCFS2_LOCK_BUSY
)) {
810 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
814 lockres
->l_action
= OCFS2_AST_ATTACH
;
815 lockres
->l_requested
= level
;
816 lockres_or_flags(lockres
, OCFS2_LOCK_BUSY
);
817 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
819 status
= dlmlock(osb
->dlm
,
824 OCFS2_LOCK_ID_MAX_LEN
- 1,
828 if (status
!= DLM_NORMAL
) {
829 ocfs2_log_dlm_error("dlmlock", status
, lockres
);
831 ocfs2_recover_from_dlm_error(lockres
, 1);
834 mlog(0, "lock %s, successfull return from dlmlock\n", lockres
->l_name
);
841 static inline int ocfs2_check_wait_flag(struct ocfs2_lock_res
*lockres
,
847 spin_lock_irqsave(&lockres
->l_lock
, flags
);
848 ret
= lockres
->l_flags
& flag
;
849 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
854 static inline void ocfs2_wait_on_busy_lock(struct ocfs2_lock_res
*lockres
)
857 wait_event(lockres
->l_event
,
858 !ocfs2_check_wait_flag(lockres
, OCFS2_LOCK_BUSY
));
861 static inline void ocfs2_wait_on_refreshing_lock(struct ocfs2_lock_res
*lockres
)
864 wait_event(lockres
->l_event
,
865 !ocfs2_check_wait_flag(lockres
, OCFS2_LOCK_REFRESHING
));
868 /* predict what lock level we'll be dropping down to on behalf
869 * of another node, and return true if the currently wanted
870 * level will be compatible with it. */
871 static inline int ocfs2_may_continue_on_blocked_lock(struct ocfs2_lock_res
*lockres
,
874 BUG_ON(!(lockres
->l_flags
& OCFS2_LOCK_BLOCKED
));
876 return wanted
<= ocfs2_highest_compat_lock_level(lockres
->l_blocking
);
879 static void ocfs2_init_mask_waiter(struct ocfs2_mask_waiter
*mw
)
881 INIT_LIST_HEAD(&mw
->mw_item
);
882 init_completion(&mw
->mw_complete
);
885 static int ocfs2_wait_for_mask(struct ocfs2_mask_waiter
*mw
)
887 wait_for_completion(&mw
->mw_complete
);
888 /* Re-arm the completion in case we want to wait on it again */
889 INIT_COMPLETION(mw
->mw_complete
);
890 return mw
->mw_status
;
893 static void lockres_add_mask_waiter(struct ocfs2_lock_res
*lockres
,
894 struct ocfs2_mask_waiter
*mw
,
898 BUG_ON(!list_empty(&mw
->mw_item
));
900 assert_spin_locked(&lockres
->l_lock
);
902 list_add_tail(&mw
->mw_item
, &lockres
->l_mask_waiters
);
907 /* returns 0 if the mw that was removed was already satisfied, -EBUSY
908 * if the mask still hadn't reached its goal */
909 static int lockres_remove_mask_waiter(struct ocfs2_lock_res
*lockres
,
910 struct ocfs2_mask_waiter
*mw
)
915 spin_lock_irqsave(&lockres
->l_lock
, flags
);
916 if (!list_empty(&mw
->mw_item
)) {
917 if ((lockres
->l_flags
& mw
->mw_mask
) != mw
->mw_goal
)
920 list_del_init(&mw
->mw_item
);
921 init_completion(&mw
->mw_complete
);
923 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
929 static int ocfs2_cluster_lock(struct ocfs2_super
*osb
,
930 struct ocfs2_lock_res
*lockres
,
935 struct ocfs2_mask_waiter mw
;
936 enum dlm_status status
;
937 int wait
, catch_signals
= !(osb
->s_mount_opt
& OCFS2_MOUNT_NOINTR
);
938 int ret
= 0; /* gcc doesn't realize wait = 1 guarantees ret is set */
943 ocfs2_init_mask_waiter(&mw
);
945 if (lockres
->l_ops
->flags
& LOCK_TYPE_USES_LVB
)
946 lkm_flags
|= LKM_VALBLK
;
951 if (catch_signals
&& signal_pending(current
)) {
956 spin_lock_irqsave(&lockres
->l_lock
, flags
);
958 mlog_bug_on_msg(lockres
->l_flags
& OCFS2_LOCK_FREEING
,
959 "Cluster lock called on freeing lockres %s! flags "
960 "0x%lx\n", lockres
->l_name
, lockres
->l_flags
);
962 /* We only compare against the currently granted level
963 * here. If the lock is blocked waiting on a downconvert,
964 * we'll get caught below. */
965 if (lockres
->l_flags
& OCFS2_LOCK_BUSY
&&
966 level
> lockres
->l_level
) {
967 /* is someone sitting in dlm_lock? If so, wait on
969 lockres_add_mask_waiter(lockres
, &mw
, OCFS2_LOCK_BUSY
, 0);
974 if (lockres
->l_flags
& OCFS2_LOCK_BLOCKED
&&
975 !ocfs2_may_continue_on_blocked_lock(lockres
, level
)) {
976 /* is the lock is currently blocked on behalf of
978 lockres_add_mask_waiter(lockres
, &mw
, OCFS2_LOCK_BLOCKED
, 0);
983 if (level
> lockres
->l_level
) {
984 if (lockres
->l_action
!= OCFS2_AST_INVALID
)
985 mlog(ML_ERROR
, "lockres %s has action %u pending\n",
986 lockres
->l_name
, lockres
->l_action
);
988 if (!(lockres
->l_flags
& OCFS2_LOCK_ATTACHED
)) {
989 lockres
->l_action
= OCFS2_AST_ATTACH
;
990 lkm_flags
&= ~LKM_CONVERT
;
992 lockres
->l_action
= OCFS2_AST_CONVERT
;
993 lkm_flags
|= LKM_CONVERT
;
996 lockres
->l_requested
= level
;
997 lockres_or_flags(lockres
, OCFS2_LOCK_BUSY
);
998 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
1000 BUG_ON(level
== LKM_IVMODE
);
1001 BUG_ON(level
== LKM_NLMODE
);
1003 mlog(0, "lock %s, convert from %d to level = %d\n",
1004 lockres
->l_name
, lockres
->l_level
, level
);
1006 /* call dlm_lock to upgrade lock now */
1007 status
= dlmlock(osb
->dlm
,
1012 OCFS2_LOCK_ID_MAX_LEN
- 1,
1015 ocfs2_blocking_ast
);
1016 if (status
!= DLM_NORMAL
) {
1017 if ((lkm_flags
& LKM_NOQUEUE
) &&
1018 (status
== DLM_NOTQUEUED
))
1021 ocfs2_log_dlm_error("dlmlock", status
,
1025 ocfs2_recover_from_dlm_error(lockres
, 1);
1029 mlog(0, "lock %s, successfull return from dlmlock\n",
1032 /* At this point we've gone inside the dlm and need to
1033 * complete our work regardless. */
1036 /* wait for busy to clear and carry on */
1040 /* Ok, if we get here then we're good to go. */
1041 ocfs2_inc_holders(lockres
, level
);
1045 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
1048 * This is helping work around a lock inversion between the page lock
1049 * and dlm locks. One path holds the page lock while calling aops
1050 * which block acquiring dlm locks. The voting thread holds dlm
1051 * locks while acquiring page locks while down converting data locks.
1052 * This block is helping an aop path notice the inversion and back
1053 * off to unlock its page lock before trying the dlm lock again.
1055 if (wait
&& arg_flags
& OCFS2_LOCK_NONBLOCK
&&
1056 mw
.mw_mask
& (OCFS2_LOCK_BUSY
|OCFS2_LOCK_BLOCKED
)) {
1058 if (lockres_remove_mask_waiter(lockres
, &mw
))
1064 ret
= ocfs2_wait_for_mask(&mw
);
1074 static void ocfs2_cluster_unlock(struct ocfs2_super
*osb
,
1075 struct ocfs2_lock_res
*lockres
,
1078 unsigned long flags
;
1081 spin_lock_irqsave(&lockres
->l_lock
, flags
);
1082 ocfs2_dec_holders(lockres
, level
);
1083 ocfs2_downconvert_on_unlock(osb
, lockres
);
1084 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
1088 static int ocfs2_create_new_lock(struct ocfs2_super
*osb
,
1089 struct ocfs2_lock_res
*lockres
,
1093 int level
= ex
? LKM_EXMODE
: LKM_PRMODE
;
1094 unsigned long flags
;
1095 int lkm_flags
= local
? LKM_LOCAL
: 0;
1097 spin_lock_irqsave(&lockres
->l_lock
, flags
);
1098 BUG_ON(lockres
->l_flags
& OCFS2_LOCK_ATTACHED
);
1099 lockres_or_flags(lockres
, OCFS2_LOCK_LOCAL
);
1100 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
1102 return ocfs2_lock_create(osb
, lockres
, level
, lkm_flags
);
1105 /* Grants us an EX lock on the data and metadata resources, skipping
1106 * the normal cluster directory lookup. Use this ONLY on newly created
1107 * inodes which other nodes can't possibly see, and which haven't been
1108 * hashed in the inode hash yet. This can give us a good performance
1109 * increase as it'll skip the network broadcast normally associated
1110 * with creating a new lock resource. */
1111 int ocfs2_create_new_inode_locks(struct inode
*inode
)
1114 struct ocfs2_super
*osb
= OCFS2_SB(inode
->i_sb
);
1117 BUG_ON(!ocfs2_inode_is_new(inode
));
1121 mlog(0, "Inode %llu\n", (unsigned long long)OCFS2_I(inode
)->ip_blkno
);
1123 /* NOTE: That we don't increment any of the holder counts, nor
1124 * do we add anything to a journal handle. Since this is
1125 * supposed to be a new inode which the cluster doesn't know
1126 * about yet, there is no need to. As far as the LVB handling
1127 * is concerned, this is basically like acquiring an EX lock
1128 * on a resource which has an invalid one -- we'll set it
1129 * valid when we release the EX. */
1131 ret
= ocfs2_create_new_lock(osb
, &OCFS2_I(inode
)->ip_rw_lockres
, 1, 1);
1138 * We don't want to use LKM_LOCAL on a meta data lock as they
1139 * don't use a generation in their lock names.
1141 ret
= ocfs2_create_new_lock(osb
, &OCFS2_I(inode
)->ip_inode_lockres
, 1, 0);
1147 ret
= ocfs2_create_new_lock(osb
, &OCFS2_I(inode
)->ip_open_lockres
, 0, 0);
1158 int ocfs2_rw_lock(struct inode
*inode
, int write
)
1161 struct ocfs2_lock_res
*lockres
;
1162 struct ocfs2_super
*osb
= OCFS2_SB(inode
->i_sb
);
1168 mlog(0, "inode %llu take %s RW lock\n",
1169 (unsigned long long)OCFS2_I(inode
)->ip_blkno
,
1170 write
? "EXMODE" : "PRMODE");
1172 if (ocfs2_mount_local(osb
))
1175 lockres
= &OCFS2_I(inode
)->ip_rw_lockres
;
1177 level
= write
? LKM_EXMODE
: LKM_PRMODE
;
1179 status
= ocfs2_cluster_lock(OCFS2_SB(inode
->i_sb
), lockres
, level
, 0,
1188 void ocfs2_rw_unlock(struct inode
*inode
, int write
)
1190 int level
= write
? LKM_EXMODE
: LKM_PRMODE
;
1191 struct ocfs2_lock_res
*lockres
= &OCFS2_I(inode
)->ip_rw_lockres
;
1192 struct ocfs2_super
*osb
= OCFS2_SB(inode
->i_sb
);
1196 mlog(0, "inode %llu drop %s RW lock\n",
1197 (unsigned long long)OCFS2_I(inode
)->ip_blkno
,
1198 write
? "EXMODE" : "PRMODE");
1200 if (!ocfs2_mount_local(osb
))
1201 ocfs2_cluster_unlock(OCFS2_SB(inode
->i_sb
), lockres
, level
);
1207 * ocfs2_open_lock always get PR mode lock.
1209 int ocfs2_open_lock(struct inode
*inode
)
1212 struct ocfs2_lock_res
*lockres
;
1213 struct ocfs2_super
*osb
= OCFS2_SB(inode
->i_sb
);
1219 mlog(0, "inode %llu take PRMODE open lock\n",
1220 (unsigned long long)OCFS2_I(inode
)->ip_blkno
);
1222 if (ocfs2_mount_local(osb
))
1225 lockres
= &OCFS2_I(inode
)->ip_open_lockres
;
1227 status
= ocfs2_cluster_lock(OCFS2_SB(inode
->i_sb
), lockres
,
1237 int ocfs2_try_open_lock(struct inode
*inode
, int write
)
1239 int status
= 0, level
;
1240 struct ocfs2_lock_res
*lockres
;
1241 struct ocfs2_super
*osb
= OCFS2_SB(inode
->i_sb
);
1247 mlog(0, "inode %llu try to take %s open lock\n",
1248 (unsigned long long)OCFS2_I(inode
)->ip_blkno
,
1249 write
? "EXMODE" : "PRMODE");
1251 if (ocfs2_mount_local(osb
))
1254 lockres
= &OCFS2_I(inode
)->ip_open_lockres
;
1256 level
= write
? LKM_EXMODE
: LKM_PRMODE
;
1259 * The file system may already holding a PRMODE/EXMODE open lock.
1260 * Since we pass LKM_NOQUEUE, the request won't block waiting on
1261 * other nodes and the -EAGAIN will indicate to the caller that
1262 * this inode is still in use.
1264 status
= ocfs2_cluster_lock(OCFS2_SB(inode
->i_sb
), lockres
,
1265 level
, LKM_NOQUEUE
, 0);
1273 * ocfs2_open_unlock unlock PR and EX mode open locks.
1275 void ocfs2_open_unlock(struct inode
*inode
)
1277 struct ocfs2_lock_res
*lockres
= &OCFS2_I(inode
)->ip_open_lockres
;
1278 struct ocfs2_super
*osb
= OCFS2_SB(inode
->i_sb
);
1282 mlog(0, "inode %llu drop open lock\n",
1283 (unsigned long long)OCFS2_I(inode
)->ip_blkno
);
1285 if (ocfs2_mount_local(osb
))
1288 if(lockres
->l_ro_holders
)
1289 ocfs2_cluster_unlock(OCFS2_SB(inode
->i_sb
), lockres
,
1291 if(lockres
->l_ex_holders
)
1292 ocfs2_cluster_unlock(OCFS2_SB(inode
->i_sb
), lockres
,
1299 static void ocfs2_downconvert_on_unlock(struct ocfs2_super
*osb
,
1300 struct ocfs2_lock_res
*lockres
)
1306 /* If we know that another node is waiting on our lock, kick
1307 * the downconvert thread * pre-emptively when we reach a release
1309 if (lockres
->l_flags
& OCFS2_LOCK_BLOCKED
) {
1310 switch(lockres
->l_blocking
) {
1312 if (!lockres
->l_ex_holders
&& !lockres
->l_ro_holders
)
1316 if (!lockres
->l_ex_holders
)
1325 ocfs2_wake_downconvert_thread(osb
);
1330 #define OCFS2_SEC_BITS 34
1331 #define OCFS2_SEC_SHIFT (64 - 34)
1332 #define OCFS2_NSEC_MASK ((1ULL << OCFS2_SEC_SHIFT) - 1)
1334 /* LVB only has room for 64 bits of time here so we pack it for
1336 static u64
ocfs2_pack_timespec(struct timespec
*spec
)
1339 u64 sec
= spec
->tv_sec
;
1340 u32 nsec
= spec
->tv_nsec
;
1342 res
= (sec
<< OCFS2_SEC_SHIFT
) | (nsec
& OCFS2_NSEC_MASK
);
1347 /* Call this with the lockres locked. I am reasonably sure we don't
1348 * need ip_lock in this function as anyone who would be changing those
1349 * values is supposed to be blocked in ocfs2_inode_lock right now. */
1350 static void __ocfs2_stuff_meta_lvb(struct inode
*inode
)
1352 struct ocfs2_inode_info
*oi
= OCFS2_I(inode
);
1353 struct ocfs2_lock_res
*lockres
= &oi
->ip_inode_lockres
;
1354 struct ocfs2_meta_lvb
*lvb
;
1358 lvb
= (struct ocfs2_meta_lvb
*) lockres
->l_lksb
.lvb
;
1361 * Invalidate the LVB of a deleted inode - this way other
1362 * nodes are forced to go to disk and discover the new inode
1365 if (oi
->ip_flags
& OCFS2_INODE_DELETED
) {
1366 lvb
->lvb_version
= 0;
1370 lvb
->lvb_version
= OCFS2_LVB_VERSION
;
1371 lvb
->lvb_isize
= cpu_to_be64(i_size_read(inode
));
1372 lvb
->lvb_iclusters
= cpu_to_be32(oi
->ip_clusters
);
1373 lvb
->lvb_iuid
= cpu_to_be32(inode
->i_uid
);
1374 lvb
->lvb_igid
= cpu_to_be32(inode
->i_gid
);
1375 lvb
->lvb_imode
= cpu_to_be16(inode
->i_mode
);
1376 lvb
->lvb_inlink
= cpu_to_be16(inode
->i_nlink
);
1377 lvb
->lvb_iatime_packed
=
1378 cpu_to_be64(ocfs2_pack_timespec(&inode
->i_atime
));
1379 lvb
->lvb_ictime_packed
=
1380 cpu_to_be64(ocfs2_pack_timespec(&inode
->i_ctime
));
1381 lvb
->lvb_imtime_packed
=
1382 cpu_to_be64(ocfs2_pack_timespec(&inode
->i_mtime
));
1383 lvb
->lvb_iattr
= cpu_to_be32(oi
->ip_attr
);
1384 lvb
->lvb_idynfeatures
= cpu_to_be16(oi
->ip_dyn_features
);
1385 lvb
->lvb_igeneration
= cpu_to_be32(inode
->i_generation
);
1388 mlog_meta_lvb(0, lockres
);
1393 static void ocfs2_unpack_timespec(struct timespec
*spec
,
1396 spec
->tv_sec
= packed_time
>> OCFS2_SEC_SHIFT
;
1397 spec
->tv_nsec
= packed_time
& OCFS2_NSEC_MASK
;
1400 static void ocfs2_refresh_inode_from_lvb(struct inode
*inode
)
1402 struct ocfs2_inode_info
*oi
= OCFS2_I(inode
);
1403 struct ocfs2_lock_res
*lockres
= &oi
->ip_inode_lockres
;
1404 struct ocfs2_meta_lvb
*lvb
;
1408 mlog_meta_lvb(0, lockres
);
1410 lvb
= (struct ocfs2_meta_lvb
*) lockres
->l_lksb
.lvb
;
1412 /* We're safe here without the lockres lock... */
1413 spin_lock(&oi
->ip_lock
);
1414 oi
->ip_clusters
= be32_to_cpu(lvb
->lvb_iclusters
);
1415 i_size_write(inode
, be64_to_cpu(lvb
->lvb_isize
));
1417 oi
->ip_attr
= be32_to_cpu(lvb
->lvb_iattr
);
1418 oi
->ip_dyn_features
= be16_to_cpu(lvb
->lvb_idynfeatures
);
1419 ocfs2_set_inode_flags(inode
);
1421 /* fast-symlinks are a special case */
1422 if (S_ISLNK(inode
->i_mode
) && !oi
->ip_clusters
)
1423 inode
->i_blocks
= 0;
1425 inode
->i_blocks
= ocfs2_inode_sector_count(inode
);
1427 inode
->i_uid
= be32_to_cpu(lvb
->lvb_iuid
);
1428 inode
->i_gid
= be32_to_cpu(lvb
->lvb_igid
);
1429 inode
->i_mode
= be16_to_cpu(lvb
->lvb_imode
);
1430 inode
->i_nlink
= be16_to_cpu(lvb
->lvb_inlink
);
1431 ocfs2_unpack_timespec(&inode
->i_atime
,
1432 be64_to_cpu(lvb
->lvb_iatime_packed
));
1433 ocfs2_unpack_timespec(&inode
->i_mtime
,
1434 be64_to_cpu(lvb
->lvb_imtime_packed
));
1435 ocfs2_unpack_timespec(&inode
->i_ctime
,
1436 be64_to_cpu(lvb
->lvb_ictime_packed
));
1437 spin_unlock(&oi
->ip_lock
);
1442 static inline int ocfs2_meta_lvb_is_trustable(struct inode
*inode
,
1443 struct ocfs2_lock_res
*lockres
)
1445 struct ocfs2_meta_lvb
*lvb
= (struct ocfs2_meta_lvb
*) lockres
->l_lksb
.lvb
;
1447 if (lvb
->lvb_version
== OCFS2_LVB_VERSION
1448 && be32_to_cpu(lvb
->lvb_igeneration
) == inode
->i_generation
)
1453 /* Determine whether a lock resource needs to be refreshed, and
1454 * arbitrate who gets to refresh it.
1456 * 0 means no refresh needed.
1458 * > 0 means you need to refresh this and you MUST call
1459 * ocfs2_complete_lock_res_refresh afterwards. */
1460 static int ocfs2_should_refresh_lock_res(struct ocfs2_lock_res
*lockres
)
1462 unsigned long flags
;
1468 spin_lock_irqsave(&lockres
->l_lock
, flags
);
1469 if (!(lockres
->l_flags
& OCFS2_LOCK_NEEDS_REFRESH
)) {
1470 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
1474 if (lockres
->l_flags
& OCFS2_LOCK_REFRESHING
) {
1475 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
1477 ocfs2_wait_on_refreshing_lock(lockres
);
1481 /* Ok, I'll be the one to refresh this lock. */
1482 lockres_or_flags(lockres
, OCFS2_LOCK_REFRESHING
);
1483 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
1491 /* If status is non zero, I'll mark it as not being in refresh
1492 * anymroe, but i won't clear the needs refresh flag. */
1493 static inline void ocfs2_complete_lock_res_refresh(struct ocfs2_lock_res
*lockres
,
1496 unsigned long flags
;
1499 spin_lock_irqsave(&lockres
->l_lock
, flags
);
1500 lockres_clear_flags(lockres
, OCFS2_LOCK_REFRESHING
);
1502 lockres_clear_flags(lockres
, OCFS2_LOCK_NEEDS_REFRESH
);
1503 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
1505 wake_up(&lockres
->l_event
);
1510 /* may or may not return a bh if it went to disk. */
1511 static int ocfs2_inode_lock_update(struct inode
*inode
,
1512 struct buffer_head
**bh
)
1515 struct ocfs2_inode_info
*oi
= OCFS2_I(inode
);
1516 struct ocfs2_lock_res
*lockres
= &oi
->ip_inode_lockres
;
1517 struct ocfs2_dinode
*fe
;
1518 struct ocfs2_super
*osb
= OCFS2_SB(inode
->i_sb
);
1522 if (ocfs2_mount_local(osb
))
1525 spin_lock(&oi
->ip_lock
);
1526 if (oi
->ip_flags
& OCFS2_INODE_DELETED
) {
1527 mlog(0, "Orphaned inode %llu was deleted while we "
1528 "were waiting on a lock. ip_flags = 0x%x\n",
1529 (unsigned long long)oi
->ip_blkno
, oi
->ip_flags
);
1530 spin_unlock(&oi
->ip_lock
);
1534 spin_unlock(&oi
->ip_lock
);
1536 if (!ocfs2_should_refresh_lock_res(lockres
))
1539 /* This will discard any caching information we might have had
1540 * for the inode metadata. */
1541 ocfs2_metadata_cache_purge(inode
);
1543 ocfs2_extent_map_trunc(inode
, 0);
1545 if (ocfs2_meta_lvb_is_trustable(inode
, lockres
)) {
1546 mlog(0, "Trusting LVB on inode %llu\n",
1547 (unsigned long long)oi
->ip_blkno
);
1548 ocfs2_refresh_inode_from_lvb(inode
);
1550 /* Boo, we have to go to disk. */
1551 /* read bh, cast, ocfs2_refresh_inode */
1552 status
= ocfs2_read_block(OCFS2_SB(inode
->i_sb
), oi
->ip_blkno
,
1553 bh
, OCFS2_BH_CACHED
, inode
);
1558 fe
= (struct ocfs2_dinode
*) (*bh
)->b_data
;
1560 /* This is a good chance to make sure we're not
1561 * locking an invalid object.
1563 * We bug on a stale inode here because we checked
1564 * above whether it was wiped from disk. The wiping
1565 * node provides a guarantee that we receive that
1566 * message and can mark the inode before dropping any
1567 * locks associated with it. */
1568 if (!OCFS2_IS_VALID_DINODE(fe
)) {
1569 OCFS2_RO_ON_INVALID_DINODE(inode
->i_sb
, fe
);
1573 mlog_bug_on_msg(inode
->i_generation
!=
1574 le32_to_cpu(fe
->i_generation
),
1575 "Invalid dinode %llu disk generation: %u "
1576 "inode->i_generation: %u\n",
1577 (unsigned long long)oi
->ip_blkno
,
1578 le32_to_cpu(fe
->i_generation
),
1579 inode
->i_generation
);
1580 mlog_bug_on_msg(le64_to_cpu(fe
->i_dtime
) ||
1581 !(fe
->i_flags
& cpu_to_le32(OCFS2_VALID_FL
)),
1582 "Stale dinode %llu dtime: %llu flags: 0x%x\n",
1583 (unsigned long long)oi
->ip_blkno
,
1584 (unsigned long long)le64_to_cpu(fe
->i_dtime
),
1585 le32_to_cpu(fe
->i_flags
));
1587 ocfs2_refresh_inode(inode
, fe
);
1592 ocfs2_complete_lock_res_refresh(lockres
, status
);
1598 static int ocfs2_assign_bh(struct inode
*inode
,
1599 struct buffer_head
**ret_bh
,
1600 struct buffer_head
*passed_bh
)
1605 /* Ok, the update went to disk for us, use the
1607 *ret_bh
= passed_bh
;
1613 status
= ocfs2_read_block(OCFS2_SB(inode
->i_sb
),
1614 OCFS2_I(inode
)->ip_blkno
,
1625 * returns < 0 error if the callback will never be called, otherwise
1626 * the result of the lock will be communicated via the callback.
1628 int ocfs2_inode_lock_full(struct inode
*inode
,
1629 struct buffer_head
**ret_bh
,
1633 int status
, level
, dlm_flags
, acquired
;
1634 struct ocfs2_lock_res
*lockres
= NULL
;
1635 struct ocfs2_super
*osb
= OCFS2_SB(inode
->i_sb
);
1636 struct buffer_head
*local_bh
= NULL
;
1642 mlog(0, "inode %llu, take %s META lock\n",
1643 (unsigned long long)OCFS2_I(inode
)->ip_blkno
,
1644 ex
? "EXMODE" : "PRMODE");
1648 /* We'll allow faking a readonly metadata lock for
1650 if (ocfs2_is_hard_readonly(osb
)) {
1656 if (ocfs2_mount_local(osb
))
1659 if (!(arg_flags
& OCFS2_META_LOCK_RECOVERY
))
1660 wait_event(osb
->recovery_event
,
1661 ocfs2_node_map_is_empty(osb
, &osb
->recovery_map
));
1663 lockres
= &OCFS2_I(inode
)->ip_inode_lockres
;
1664 level
= ex
? LKM_EXMODE
: LKM_PRMODE
;
1666 if (arg_flags
& OCFS2_META_LOCK_NOQUEUE
)
1667 dlm_flags
|= LKM_NOQUEUE
;
1669 status
= ocfs2_cluster_lock(osb
, lockres
, level
, dlm_flags
, arg_flags
);
1671 if (status
!= -EAGAIN
&& status
!= -EIOCBRETRY
)
1676 /* Notify the error cleanup path to drop the cluster lock. */
1679 /* We wait twice because a node may have died while we were in
1680 * the lower dlm layers. The second time though, we've
1681 * committed to owning this lock so we don't allow signals to
1682 * abort the operation. */
1683 if (!(arg_flags
& OCFS2_META_LOCK_RECOVERY
))
1684 wait_event(osb
->recovery_event
,
1685 ocfs2_node_map_is_empty(osb
, &osb
->recovery_map
));
1689 * We only see this flag if we're being called from
1690 * ocfs2_read_locked_inode(). It means we're locking an inode
1691 * which hasn't been populated yet, so clear the refresh flag
1692 * and let the caller handle it.
1694 if (inode
->i_state
& I_NEW
) {
1697 ocfs2_complete_lock_res_refresh(lockres
, 0);
1701 /* This is fun. The caller may want a bh back, or it may
1702 * not. ocfs2_inode_lock_update definitely wants one in, but
1703 * may or may not read one, depending on what's in the
1704 * LVB. The result of all of this is that we've *only* gone to
1705 * disk if we have to, so the complexity is worthwhile. */
1706 status
= ocfs2_inode_lock_update(inode
, &local_bh
);
1708 if (status
!= -ENOENT
)
1714 status
= ocfs2_assign_bh(inode
, ret_bh
, local_bh
);
1723 if (ret_bh
&& (*ret_bh
)) {
1728 ocfs2_inode_unlock(inode
, ex
);
1739 * This is working around a lock inversion between tasks acquiring DLM
1740 * locks while holding a page lock and the downconvert thread which
1741 * blocks dlm lock acquiry while acquiring page locks.
1743 * ** These _with_page variantes are only intended to be called from aop
1744 * methods that hold page locks and return a very specific *positive* error
1745 * code that aop methods pass up to the VFS -- test for errors with != 0. **
1747 * The DLM is called such that it returns -EAGAIN if it would have
1748 * blocked waiting for the downconvert thread. In that case we unlock
1749 * our page so the downconvert thread can make progress. Once we've
1750 * done this we have to return AOP_TRUNCATED_PAGE so the aop method
1751 * that called us can bubble that back up into the VFS who will then
1752 * immediately retry the aop call.
1754 * We do a blocking lock and immediate unlock before returning, though, so that
1755 * the lock has a great chance of being cached on this node by the time the VFS
1756 * calls back to retry the aop. This has a potential to livelock as nodes
1757 * ping locks back and forth, but that's a risk we're willing to take to avoid
1758 * the lock inversion simply.
1760 int ocfs2_inode_lock_with_page(struct inode
*inode
,
1761 struct buffer_head
**ret_bh
,
1767 ret
= ocfs2_inode_lock_full(inode
, ret_bh
, ex
, OCFS2_LOCK_NONBLOCK
);
1768 if (ret
== -EAGAIN
) {
1770 if (ocfs2_inode_lock(inode
, ret_bh
, ex
) == 0)
1771 ocfs2_inode_unlock(inode
, ex
);
1772 ret
= AOP_TRUNCATED_PAGE
;
1778 int ocfs2_inode_lock_atime(struct inode
*inode
,
1779 struct vfsmount
*vfsmnt
,
1785 ret
= ocfs2_inode_lock(inode
, NULL
, 0);
1792 * If we should update atime, we will get EX lock,
1793 * otherwise we just get PR lock.
1795 if (ocfs2_should_update_atime(inode
, vfsmnt
)) {
1796 struct buffer_head
*bh
= NULL
;
1798 ocfs2_inode_unlock(inode
, 0);
1799 ret
= ocfs2_inode_lock(inode
, &bh
, 1);
1805 if (ocfs2_should_update_atime(inode
, vfsmnt
))
1806 ocfs2_update_inode_atime(inode
, bh
);
1816 void ocfs2_inode_unlock(struct inode
*inode
,
1819 int level
= ex
? LKM_EXMODE
: LKM_PRMODE
;
1820 struct ocfs2_lock_res
*lockres
= &OCFS2_I(inode
)->ip_inode_lockres
;
1821 struct ocfs2_super
*osb
= OCFS2_SB(inode
->i_sb
);
1825 mlog(0, "inode %llu drop %s META lock\n",
1826 (unsigned long long)OCFS2_I(inode
)->ip_blkno
,
1827 ex
? "EXMODE" : "PRMODE");
1829 if (!ocfs2_is_hard_readonly(OCFS2_SB(inode
->i_sb
)) &&
1830 !ocfs2_mount_local(osb
))
1831 ocfs2_cluster_unlock(OCFS2_SB(inode
->i_sb
), lockres
, level
);
1836 int ocfs2_super_lock(struct ocfs2_super
*osb
,
1840 int level
= ex
? LKM_EXMODE
: LKM_PRMODE
;
1841 struct ocfs2_lock_res
*lockres
= &osb
->osb_super_lockres
;
1842 struct buffer_head
*bh
;
1843 struct ocfs2_slot_info
*si
= osb
->slot_info
;
1847 if (ocfs2_is_hard_readonly(osb
))
1850 if (ocfs2_mount_local(osb
))
1853 status
= ocfs2_cluster_lock(osb
, lockres
, level
, 0, 0);
1859 /* The super block lock path is really in the best position to
1860 * know when resources covered by the lock need to be
1861 * refreshed, so we do it here. Of course, making sense of
1862 * everything is up to the caller :) */
1863 status
= ocfs2_should_refresh_lock_res(lockres
);
1870 status
= ocfs2_read_block(osb
, bh
->b_blocknr
, &bh
, 0,
1873 ocfs2_update_slot_info(si
);
1875 ocfs2_complete_lock_res_refresh(lockres
, status
);
1885 void ocfs2_super_unlock(struct ocfs2_super
*osb
,
1888 int level
= ex
? LKM_EXMODE
: LKM_PRMODE
;
1889 struct ocfs2_lock_res
*lockres
= &osb
->osb_super_lockres
;
1891 if (!ocfs2_mount_local(osb
))
1892 ocfs2_cluster_unlock(osb
, lockres
, level
);
1895 int ocfs2_rename_lock(struct ocfs2_super
*osb
)
1898 struct ocfs2_lock_res
*lockres
= &osb
->osb_rename_lockres
;
1900 if (ocfs2_is_hard_readonly(osb
))
1903 if (ocfs2_mount_local(osb
))
1906 status
= ocfs2_cluster_lock(osb
, lockres
, LKM_EXMODE
, 0, 0);
1913 void ocfs2_rename_unlock(struct ocfs2_super
*osb
)
1915 struct ocfs2_lock_res
*lockres
= &osb
->osb_rename_lockres
;
1917 if (!ocfs2_mount_local(osb
))
1918 ocfs2_cluster_unlock(osb
, lockres
, LKM_EXMODE
);
1921 int ocfs2_dentry_lock(struct dentry
*dentry
, int ex
)
1924 int level
= ex
? LKM_EXMODE
: LKM_PRMODE
;
1925 struct ocfs2_dentry_lock
*dl
= dentry
->d_fsdata
;
1926 struct ocfs2_super
*osb
= OCFS2_SB(dentry
->d_sb
);
1930 if (ocfs2_is_hard_readonly(osb
))
1933 if (ocfs2_mount_local(osb
))
1936 ret
= ocfs2_cluster_lock(osb
, &dl
->dl_lockres
, level
, 0, 0);
1943 void ocfs2_dentry_unlock(struct dentry
*dentry
, int ex
)
1945 int level
= ex
? LKM_EXMODE
: LKM_PRMODE
;
1946 struct ocfs2_dentry_lock
*dl
= dentry
->d_fsdata
;
1947 struct ocfs2_super
*osb
= OCFS2_SB(dentry
->d_sb
);
1949 if (!ocfs2_mount_local(osb
))
1950 ocfs2_cluster_unlock(osb
, &dl
->dl_lockres
, level
);
1953 /* Reference counting of the dlm debug structure. We want this because
1954 * open references on the debug inodes can live on after a mount, so
1955 * we can't rely on the ocfs2_super to always exist. */
1956 static void ocfs2_dlm_debug_free(struct kref
*kref
)
1958 struct ocfs2_dlm_debug
*dlm_debug
;
1960 dlm_debug
= container_of(kref
, struct ocfs2_dlm_debug
, d_refcnt
);
1965 void ocfs2_put_dlm_debug(struct ocfs2_dlm_debug
*dlm_debug
)
1968 kref_put(&dlm_debug
->d_refcnt
, ocfs2_dlm_debug_free
);
1971 static void ocfs2_get_dlm_debug(struct ocfs2_dlm_debug
*debug
)
1973 kref_get(&debug
->d_refcnt
);
1976 struct ocfs2_dlm_debug
*ocfs2_new_dlm_debug(void)
1978 struct ocfs2_dlm_debug
*dlm_debug
;
1980 dlm_debug
= kmalloc(sizeof(struct ocfs2_dlm_debug
), GFP_KERNEL
);
1982 mlog_errno(-ENOMEM
);
1986 kref_init(&dlm_debug
->d_refcnt
);
1987 INIT_LIST_HEAD(&dlm_debug
->d_lockres_tracking
);
1988 dlm_debug
->d_locking_state
= NULL
;
1993 /* Access to this is arbitrated for us via seq_file->sem. */
1994 struct ocfs2_dlm_seq_priv
{
1995 struct ocfs2_dlm_debug
*p_dlm_debug
;
1996 struct ocfs2_lock_res p_iter_res
;
1997 struct ocfs2_lock_res p_tmp_res
;
2000 static struct ocfs2_lock_res
*ocfs2_dlm_next_res(struct ocfs2_lock_res
*start
,
2001 struct ocfs2_dlm_seq_priv
*priv
)
2003 struct ocfs2_lock_res
*iter
, *ret
= NULL
;
2004 struct ocfs2_dlm_debug
*dlm_debug
= priv
->p_dlm_debug
;
2006 assert_spin_locked(&ocfs2_dlm_tracking_lock
);
2008 list_for_each_entry(iter
, &start
->l_debug_list
, l_debug_list
) {
2009 /* discover the head of the list */
2010 if (&iter
->l_debug_list
== &dlm_debug
->d_lockres_tracking
) {
2011 mlog(0, "End of list found, %p\n", ret
);
2015 /* We track our "dummy" iteration lockres' by a NULL
2017 if (iter
->l_ops
!= NULL
) {
2026 static void *ocfs2_dlm_seq_start(struct seq_file
*m
, loff_t
*pos
)
2028 struct ocfs2_dlm_seq_priv
*priv
= m
->private;
2029 struct ocfs2_lock_res
*iter
;
2031 spin_lock(&ocfs2_dlm_tracking_lock
);
2032 iter
= ocfs2_dlm_next_res(&priv
->p_iter_res
, priv
);
2034 /* Since lockres' have the lifetime of their container
2035 * (which can be inodes, ocfs2_supers, etc) we want to
2036 * copy this out to a temporary lockres while still
2037 * under the spinlock. Obviously after this we can't
2038 * trust any pointers on the copy returned, but that's
2039 * ok as the information we want isn't typically held
2041 priv
->p_tmp_res
= *iter
;
2042 iter
= &priv
->p_tmp_res
;
2044 spin_unlock(&ocfs2_dlm_tracking_lock
);
2049 static void ocfs2_dlm_seq_stop(struct seq_file
*m
, void *v
)
2053 static void *ocfs2_dlm_seq_next(struct seq_file
*m
, void *v
, loff_t
*pos
)
2055 struct ocfs2_dlm_seq_priv
*priv
= m
->private;
2056 struct ocfs2_lock_res
*iter
= v
;
2057 struct ocfs2_lock_res
*dummy
= &priv
->p_iter_res
;
2059 spin_lock(&ocfs2_dlm_tracking_lock
);
2060 iter
= ocfs2_dlm_next_res(iter
, priv
);
2061 list_del_init(&dummy
->l_debug_list
);
2063 list_add(&dummy
->l_debug_list
, &iter
->l_debug_list
);
2064 priv
->p_tmp_res
= *iter
;
2065 iter
= &priv
->p_tmp_res
;
2067 spin_unlock(&ocfs2_dlm_tracking_lock
);
2072 /* So that debugfs.ocfs2 can determine which format is being used */
2073 #define OCFS2_DLM_DEBUG_STR_VERSION 1
2074 static int ocfs2_dlm_seq_show(struct seq_file
*m
, void *v
)
2078 struct ocfs2_lock_res
*lockres
= v
;
2083 seq_printf(m
, "0x%x\t", OCFS2_DLM_DEBUG_STR_VERSION
);
2085 if (lockres
->l_type
== OCFS2_LOCK_TYPE_DENTRY
)
2086 seq_printf(m
, "%.*s%08x\t", OCFS2_DENTRY_LOCK_INO_START
- 1,
2088 (unsigned int)ocfs2_get_dentry_lock_ino(lockres
));
2090 seq_printf(m
, "%.*s\t", OCFS2_LOCK_ID_MAX_LEN
, lockres
->l_name
);
2092 seq_printf(m
, "%d\t"
2103 lockres
->l_unlock_action
,
2104 lockres
->l_ro_holders
,
2105 lockres
->l_ex_holders
,
2106 lockres
->l_requested
,
2107 lockres
->l_blocking
);
2109 /* Dump the raw LVB */
2110 lvb
= lockres
->l_lksb
.lvb
;
2111 for(i
= 0; i
< DLM_LVB_LEN
; i
++)
2112 seq_printf(m
, "0x%x\t", lvb
[i
]);
2115 seq_printf(m
, "\n");
2119 static struct seq_operations ocfs2_dlm_seq_ops
= {
2120 .start
= ocfs2_dlm_seq_start
,
2121 .stop
= ocfs2_dlm_seq_stop
,
2122 .next
= ocfs2_dlm_seq_next
,
2123 .show
= ocfs2_dlm_seq_show
,
2126 static int ocfs2_dlm_debug_release(struct inode
*inode
, struct file
*file
)
2128 struct seq_file
*seq
= (struct seq_file
*) file
->private_data
;
2129 struct ocfs2_dlm_seq_priv
*priv
= seq
->private;
2130 struct ocfs2_lock_res
*res
= &priv
->p_iter_res
;
2132 ocfs2_remove_lockres_tracking(res
);
2133 ocfs2_put_dlm_debug(priv
->p_dlm_debug
);
2134 return seq_release_private(inode
, file
);
2137 static int ocfs2_dlm_debug_open(struct inode
*inode
, struct file
*file
)
2140 struct ocfs2_dlm_seq_priv
*priv
;
2141 struct seq_file
*seq
;
2142 struct ocfs2_super
*osb
;
2144 priv
= kzalloc(sizeof(struct ocfs2_dlm_seq_priv
), GFP_KERNEL
);
2150 osb
= inode
->i_private
;
2151 ocfs2_get_dlm_debug(osb
->osb_dlm_debug
);
2152 priv
->p_dlm_debug
= osb
->osb_dlm_debug
;
2153 INIT_LIST_HEAD(&priv
->p_iter_res
.l_debug_list
);
2155 ret
= seq_open(file
, &ocfs2_dlm_seq_ops
);
2162 seq
= (struct seq_file
*) file
->private_data
;
2163 seq
->private = priv
;
2165 ocfs2_add_lockres_tracking(&priv
->p_iter_res
,
2172 static const struct file_operations ocfs2_dlm_debug_fops
= {
2173 .open
= ocfs2_dlm_debug_open
,
2174 .release
= ocfs2_dlm_debug_release
,
2176 .llseek
= seq_lseek
,
2179 static int ocfs2_dlm_init_debug(struct ocfs2_super
*osb
)
2182 struct ocfs2_dlm_debug
*dlm_debug
= osb
->osb_dlm_debug
;
2184 dlm_debug
->d_locking_state
= debugfs_create_file("locking_state",
2186 osb
->osb_debug_root
,
2188 &ocfs2_dlm_debug_fops
);
2189 if (!dlm_debug
->d_locking_state
) {
2192 "Unable to create locking state debugfs file.\n");
2196 ocfs2_get_dlm_debug(dlm_debug
);
2201 static void ocfs2_dlm_shutdown_debug(struct ocfs2_super
*osb
)
2203 struct ocfs2_dlm_debug
*dlm_debug
= osb
->osb_dlm_debug
;
2206 debugfs_remove(dlm_debug
->d_locking_state
);
2207 ocfs2_put_dlm_debug(dlm_debug
);
2211 int ocfs2_dlm_init(struct ocfs2_super
*osb
)
2215 struct dlm_ctxt
*dlm
= NULL
;
2219 if (ocfs2_mount_local(osb
))
2222 status
= ocfs2_dlm_init_debug(osb
);
2228 /* launch downconvert thread */
2229 osb
->dc_task
= kthread_run(ocfs2_downconvert_thread
, osb
, "ocfs2dc");
2230 if (IS_ERR(osb
->dc_task
)) {
2231 status
= PTR_ERR(osb
->dc_task
);
2232 osb
->dc_task
= NULL
;
2237 /* used by the dlm code to make message headers unique, each
2238 * node in this domain must agree on this. */
2239 dlm_key
= crc32_le(0, osb
->uuid_str
, strlen(osb
->uuid_str
));
2241 /* for now, uuid == domain */
2242 dlm
= dlm_register_domain(osb
->uuid_str
, dlm_key
);
2244 status
= PTR_ERR(dlm
);
2249 dlm_register_eviction_cb(dlm
, &osb
->osb_eviction_cb
);
2252 ocfs2_super_lock_res_init(&osb
->osb_super_lockres
, osb
);
2253 ocfs2_rename_lock_res_init(&osb
->osb_rename_lockres
, osb
);
2260 ocfs2_dlm_shutdown_debug(osb
);
2262 kthread_stop(osb
->dc_task
);
2269 void ocfs2_dlm_shutdown(struct ocfs2_super
*osb
)
2273 dlm_unregister_eviction_cb(&osb
->osb_eviction_cb
);
2275 ocfs2_drop_osb_locks(osb
);
2278 kthread_stop(osb
->dc_task
);
2279 osb
->dc_task
= NULL
;
2282 ocfs2_lock_res_free(&osb
->osb_super_lockres
);
2283 ocfs2_lock_res_free(&osb
->osb_rename_lockres
);
2285 dlm_unregister_domain(osb
->dlm
);
2288 ocfs2_dlm_shutdown_debug(osb
);
2293 static void ocfs2_unlock_ast(void *opaque
, enum dlm_status status
)
2295 struct ocfs2_lock_res
*lockres
= opaque
;
2296 unsigned long flags
;
2300 mlog(0, "UNLOCK AST called on lock %s, action = %d\n", lockres
->l_name
,
2301 lockres
->l_unlock_action
);
2303 spin_lock_irqsave(&lockres
->l_lock
, flags
);
2304 /* We tried to cancel a convert request, but it was already
2305 * granted. All we want to do here is clear our unlock
2306 * state. The wake_up call done at the bottom is redundant
2307 * (ocfs2_prepare_cancel_convert doesn't sleep on this) but doesn't
2308 * hurt anything anyway */
2309 if (status
== DLM_CANCELGRANT
&&
2310 lockres
->l_unlock_action
== OCFS2_UNLOCK_CANCEL_CONVERT
) {
2311 mlog(0, "Got cancelgrant for %s\n", lockres
->l_name
);
2313 /* We don't clear the busy flag in this case as it
2314 * should have been cleared by the ast which the dlm
2316 goto complete_unlock
;
2319 if (status
!= DLM_NORMAL
) {
2320 mlog(ML_ERROR
, "Dlm passes status %d for lock %s, "
2321 "unlock_action %d\n", status
, lockres
->l_name
,
2322 lockres
->l_unlock_action
);
2323 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
2327 switch(lockres
->l_unlock_action
) {
2328 case OCFS2_UNLOCK_CANCEL_CONVERT
:
2329 mlog(0, "Cancel convert success for %s\n", lockres
->l_name
);
2330 lockres
->l_action
= OCFS2_AST_INVALID
;
2332 case OCFS2_UNLOCK_DROP_LOCK
:
2333 lockres
->l_level
= LKM_IVMODE
;
2339 lockres_clear_flags(lockres
, OCFS2_LOCK_BUSY
);
2341 lockres
->l_unlock_action
= OCFS2_UNLOCK_INVALID
;
2342 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
2344 wake_up(&lockres
->l_event
);
2349 static int ocfs2_drop_lock(struct ocfs2_super
*osb
,
2350 struct ocfs2_lock_res
*lockres
)
2352 enum dlm_status status
;
2353 unsigned long flags
;
2356 /* We didn't get anywhere near actually using this lockres. */
2357 if (!(lockres
->l_flags
& OCFS2_LOCK_INITIALIZED
))
2360 if (lockres
->l_ops
->flags
& LOCK_TYPE_USES_LVB
)
2361 lkm_flags
|= LKM_VALBLK
;
2363 spin_lock_irqsave(&lockres
->l_lock
, flags
);
2365 mlog_bug_on_msg(!(lockres
->l_flags
& OCFS2_LOCK_FREEING
),
2366 "lockres %s, flags 0x%lx\n",
2367 lockres
->l_name
, lockres
->l_flags
);
2369 while (lockres
->l_flags
& OCFS2_LOCK_BUSY
) {
2370 mlog(0, "waiting on busy lock \"%s\": flags = %lx, action = "
2371 "%u, unlock_action = %u\n",
2372 lockres
->l_name
, lockres
->l_flags
, lockres
->l_action
,
2373 lockres
->l_unlock_action
);
2375 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
2377 /* XXX: Today we just wait on any busy
2378 * locks... Perhaps we need to cancel converts in the
2380 ocfs2_wait_on_busy_lock(lockres
);
2382 spin_lock_irqsave(&lockres
->l_lock
, flags
);
2385 if (lockres
->l_ops
->flags
& LOCK_TYPE_USES_LVB
) {
2386 if (lockres
->l_flags
& OCFS2_LOCK_ATTACHED
&&
2387 lockres
->l_level
== LKM_EXMODE
&&
2388 !(lockres
->l_flags
& OCFS2_LOCK_NEEDS_REFRESH
))
2389 lockres
->l_ops
->set_lvb(lockres
);
2392 if (lockres
->l_flags
& OCFS2_LOCK_BUSY
)
2393 mlog(ML_ERROR
, "destroying busy lock: \"%s\"\n",
2395 if (lockres
->l_flags
& OCFS2_LOCK_BLOCKED
)
2396 mlog(0, "destroying blocked lock: \"%s\"\n", lockres
->l_name
);
2398 if (!(lockres
->l_flags
& OCFS2_LOCK_ATTACHED
)) {
2399 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
2403 lockres_clear_flags(lockres
, OCFS2_LOCK_ATTACHED
);
2405 /* make sure we never get here while waiting for an ast to
2407 BUG_ON(lockres
->l_action
!= OCFS2_AST_INVALID
);
2409 /* is this necessary? */
2410 lockres_or_flags(lockres
, OCFS2_LOCK_BUSY
);
2411 lockres
->l_unlock_action
= OCFS2_UNLOCK_DROP_LOCK
;
2412 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
2414 mlog(0, "lock %s\n", lockres
->l_name
);
2416 status
= dlmunlock(osb
->dlm
, &lockres
->l_lksb
, lkm_flags
,
2417 ocfs2_unlock_ast
, lockres
);
2418 if (status
!= DLM_NORMAL
) {
2419 ocfs2_log_dlm_error("dlmunlock", status
, lockres
);
2420 mlog(ML_ERROR
, "lockres flags: %lu\n", lockres
->l_flags
);
2421 dlm_print_one_lock(lockres
->l_lksb
.lockid
);
2424 mlog(0, "lock %s, successfull return from dlmunlock\n",
2427 ocfs2_wait_on_busy_lock(lockres
);
2433 /* Mark the lockres as being dropped. It will no longer be
2434 * queued if blocking, but we still may have to wait on it
2435 * being dequeued from the downconvert thread before we can consider
2438 * You can *not* attempt to call cluster_lock on this lockres anymore. */
2439 void ocfs2_mark_lockres_freeing(struct ocfs2_lock_res
*lockres
)
2442 struct ocfs2_mask_waiter mw
;
2443 unsigned long flags
;
2445 ocfs2_init_mask_waiter(&mw
);
2447 spin_lock_irqsave(&lockres
->l_lock
, flags
);
2448 lockres
->l_flags
|= OCFS2_LOCK_FREEING
;
2449 while (lockres
->l_flags
& OCFS2_LOCK_QUEUED
) {
2450 lockres_add_mask_waiter(lockres
, &mw
, OCFS2_LOCK_QUEUED
, 0);
2451 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
2453 mlog(0, "Waiting on lockres %s\n", lockres
->l_name
);
2455 status
= ocfs2_wait_for_mask(&mw
);
2459 spin_lock_irqsave(&lockres
->l_lock
, flags
);
2461 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
2464 void ocfs2_simple_drop_lockres(struct ocfs2_super
*osb
,
2465 struct ocfs2_lock_res
*lockres
)
2469 ocfs2_mark_lockres_freeing(lockres
);
2470 ret
= ocfs2_drop_lock(osb
, lockres
);
2475 static void ocfs2_drop_osb_locks(struct ocfs2_super
*osb
)
2477 ocfs2_simple_drop_lockres(osb
, &osb
->osb_super_lockres
);
2478 ocfs2_simple_drop_lockres(osb
, &osb
->osb_rename_lockres
);
2481 int ocfs2_drop_inode_locks(struct inode
*inode
)
2487 /* No need to call ocfs2_mark_lockres_freeing here -
2488 * ocfs2_clear_inode has done it for us. */
2490 err
= ocfs2_drop_lock(OCFS2_SB(inode
->i_sb
),
2491 &OCFS2_I(inode
)->ip_open_lockres
);
2497 err
= ocfs2_drop_lock(OCFS2_SB(inode
->i_sb
),
2498 &OCFS2_I(inode
)->ip_inode_lockres
);
2501 if (err
< 0 && !status
)
2504 err
= ocfs2_drop_lock(OCFS2_SB(inode
->i_sb
),
2505 &OCFS2_I(inode
)->ip_rw_lockres
);
2508 if (err
< 0 && !status
)
2515 static void ocfs2_prepare_downconvert(struct ocfs2_lock_res
*lockres
,
2518 assert_spin_locked(&lockres
->l_lock
);
2520 BUG_ON(lockres
->l_blocking
<= LKM_NLMODE
);
2522 if (lockres
->l_level
<= new_level
) {
2523 mlog(ML_ERROR
, "lockres->l_level (%u) <= new_level (%u)\n",
2524 lockres
->l_level
, new_level
);
2528 mlog(0, "lock %s, new_level = %d, l_blocking = %d\n",
2529 lockres
->l_name
, new_level
, lockres
->l_blocking
);
2531 lockres
->l_action
= OCFS2_AST_DOWNCONVERT
;
2532 lockres
->l_requested
= new_level
;
2533 lockres_or_flags(lockres
, OCFS2_LOCK_BUSY
);
2536 static int ocfs2_downconvert_lock(struct ocfs2_super
*osb
,
2537 struct ocfs2_lock_res
*lockres
,
2541 int ret
, dlm_flags
= LKM_CONVERT
;
2542 enum dlm_status status
;
2547 dlm_flags
|= LKM_VALBLK
;
2549 status
= dlmlock(osb
->dlm
,
2554 OCFS2_LOCK_ID_MAX_LEN
- 1,
2557 ocfs2_blocking_ast
);
2558 if (status
!= DLM_NORMAL
) {
2559 ocfs2_log_dlm_error("dlmlock", status
, lockres
);
2561 ocfs2_recover_from_dlm_error(lockres
, 1);
2571 /* returns 1 when the caller should unlock and call dlmunlock */
2572 static int ocfs2_prepare_cancel_convert(struct ocfs2_super
*osb
,
2573 struct ocfs2_lock_res
*lockres
)
2575 assert_spin_locked(&lockres
->l_lock
);
2578 mlog(0, "lock %s\n", lockres
->l_name
);
2580 if (lockres
->l_unlock_action
== OCFS2_UNLOCK_CANCEL_CONVERT
) {
2581 /* If we're already trying to cancel a lock conversion
2582 * then just drop the spinlock and allow the caller to
2583 * requeue this lock. */
2585 mlog(0, "Lockres %s, skip convert\n", lockres
->l_name
);
2589 /* were we in a convert when we got the bast fire? */
2590 BUG_ON(lockres
->l_action
!= OCFS2_AST_CONVERT
&&
2591 lockres
->l_action
!= OCFS2_AST_DOWNCONVERT
);
2592 /* set things up for the unlockast to know to just
2593 * clear out the ast_action and unset busy, etc. */
2594 lockres
->l_unlock_action
= OCFS2_UNLOCK_CANCEL_CONVERT
;
2596 mlog_bug_on_msg(!(lockres
->l_flags
& OCFS2_LOCK_BUSY
),
2597 "lock %s, invalid flags: 0x%lx\n",
2598 lockres
->l_name
, lockres
->l_flags
);
2603 static int ocfs2_cancel_convert(struct ocfs2_super
*osb
,
2604 struct ocfs2_lock_res
*lockres
)
2607 enum dlm_status status
;
2610 mlog(0, "lock %s\n", lockres
->l_name
);
2613 status
= dlmunlock(osb
->dlm
,
2618 if (status
!= DLM_NORMAL
) {
2619 ocfs2_log_dlm_error("dlmunlock", status
, lockres
);
2621 ocfs2_recover_from_dlm_error(lockres
, 0);
2624 mlog(0, "lock %s return from dlmunlock\n", lockres
->l_name
);
2630 static int ocfs2_unblock_lock(struct ocfs2_super
*osb
,
2631 struct ocfs2_lock_res
*lockres
,
2632 struct ocfs2_unblock_ctl
*ctl
)
2634 unsigned long flags
;
2642 spin_lock_irqsave(&lockres
->l_lock
, flags
);
2644 BUG_ON(!(lockres
->l_flags
& OCFS2_LOCK_BLOCKED
));
2647 if (lockres
->l_flags
& OCFS2_LOCK_BUSY
) {
2649 ret
= ocfs2_prepare_cancel_convert(osb
, lockres
);
2650 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
2652 ret
= ocfs2_cancel_convert(osb
, lockres
);
2659 /* if we're blocking an exclusive and we have *any* holders,
2661 if ((lockres
->l_blocking
== LKM_EXMODE
)
2662 && (lockres
->l_ex_holders
|| lockres
->l_ro_holders
))
2665 /* If it's a PR we're blocking, then only
2666 * requeue if we've got any EX holders */
2667 if (lockres
->l_blocking
== LKM_PRMODE
&&
2668 lockres
->l_ex_holders
)
2672 * Can we get a lock in this state if the holder counts are
2673 * zero? The meta data unblock code used to check this.
2675 if ((lockres
->l_ops
->flags
& LOCK_TYPE_REQUIRES_REFRESH
)
2676 && (lockres
->l_flags
& OCFS2_LOCK_REFRESHING
))
2679 new_level
= ocfs2_highest_compat_lock_level(lockres
->l_blocking
);
2681 if (lockres
->l_ops
->check_downconvert
2682 && !lockres
->l_ops
->check_downconvert(lockres
, new_level
))
2685 /* If we get here, then we know that there are no more
2686 * incompatible holders (and anyone asking for an incompatible
2687 * lock is blocked). We can now downconvert the lock */
2688 if (!lockres
->l_ops
->downconvert_worker
)
2691 /* Some lockres types want to do a bit of work before
2692 * downconverting a lock. Allow that here. The worker function
2693 * may sleep, so we save off a copy of what we're blocking as
2694 * it may change while we're not holding the spin lock. */
2695 blocking
= lockres
->l_blocking
;
2696 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
2698 ctl
->unblock_action
= lockres
->l_ops
->downconvert_worker(lockres
, blocking
);
2700 if (ctl
->unblock_action
== UNBLOCK_STOP_POST
)
2703 spin_lock_irqsave(&lockres
->l_lock
, flags
);
2704 if (blocking
!= lockres
->l_blocking
) {
2705 /* If this changed underneath us, then we can't drop
2713 if (lockres
->l_ops
->flags
& LOCK_TYPE_USES_LVB
) {
2714 if (lockres
->l_level
== LKM_EXMODE
)
2718 * We only set the lvb if the lock has been fully
2719 * refreshed - otherwise we risk setting stale
2720 * data. Otherwise, there's no need to actually clear
2721 * out the lvb here as it's value is still valid.
2723 if (set_lvb
&& !(lockres
->l_flags
& OCFS2_LOCK_NEEDS_REFRESH
))
2724 lockres
->l_ops
->set_lvb(lockres
);
2727 ocfs2_prepare_downconvert(lockres
, new_level
);
2728 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
2729 ret
= ocfs2_downconvert_lock(osb
, lockres
, new_level
, set_lvb
);
2735 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
2742 static int ocfs2_data_convert_worker(struct ocfs2_lock_res
*lockres
,
2745 struct inode
*inode
;
2746 struct address_space
*mapping
;
2748 inode
= ocfs2_lock_res_inode(lockres
);
2749 mapping
= inode
->i_mapping
;
2751 if (S_ISREG(inode
->i_mode
))
2755 * We need this before the filemap_fdatawrite() so that it can
2756 * transfer the dirty bit from the PTE to the
2757 * page. Unfortunately this means that even for EX->PR
2758 * downconverts, we'll lose our mappings and have to build
2761 unmap_mapping_range(mapping
, 0, 0, 0);
2763 if (filemap_fdatawrite(mapping
)) {
2764 mlog(ML_ERROR
, "Could not sync inode %llu for downconvert!",
2765 (unsigned long long)OCFS2_I(inode
)->ip_blkno
);
2767 sync_mapping_buffers(mapping
);
2768 if (blocking
== LKM_EXMODE
) {
2769 truncate_inode_pages(mapping
, 0);
2771 /* We only need to wait on the I/O if we're not also
2772 * truncating pages because truncate_inode_pages waits
2773 * for us above. We don't truncate pages if we're
2774 * blocking anything < EXMODE because we want to keep
2775 * them around in that case. */
2776 filemap_fdatawait(mapping
);
2780 return UNBLOCK_CONTINUE
;
2783 static int ocfs2_check_meta_downconvert(struct ocfs2_lock_res
*lockres
,
2786 struct inode
*inode
= ocfs2_lock_res_inode(lockres
);
2787 int checkpointed
= ocfs2_inode_fully_checkpointed(inode
);
2789 BUG_ON(new_level
!= LKM_NLMODE
&& new_level
!= LKM_PRMODE
);
2790 BUG_ON(lockres
->l_level
!= LKM_EXMODE
&& !checkpointed
);
2795 ocfs2_start_checkpoint(OCFS2_SB(inode
->i_sb
));
2799 static void ocfs2_set_meta_lvb(struct ocfs2_lock_res
*lockres
)
2801 struct inode
*inode
= ocfs2_lock_res_inode(lockres
);
2803 __ocfs2_stuff_meta_lvb(inode
);
2807 * Does the final reference drop on our dentry lock. Right now this
2808 * happens in the downconvert thread, but we could choose to simplify the
2809 * dlmglue API and push these off to the ocfs2_wq in the future.
2811 static void ocfs2_dentry_post_unlock(struct ocfs2_super
*osb
,
2812 struct ocfs2_lock_res
*lockres
)
2814 struct ocfs2_dentry_lock
*dl
= ocfs2_lock_res_dl(lockres
);
2815 ocfs2_dentry_lock_put(osb
, dl
);
2819 * d_delete() matching dentries before the lock downconvert.
2821 * At this point, any process waiting to destroy the
2822 * dentry_lock due to last ref count is stopped by the
2823 * OCFS2_LOCK_QUEUED flag.
2825 * We have two potential problems
2827 * 1) If we do the last reference drop on our dentry_lock (via dput)
2828 * we'll wind up in ocfs2_release_dentry_lock(), waiting on
2829 * the downconvert to finish. Instead we take an elevated
2830 * reference and push the drop until after we've completed our
2831 * unblock processing.
2833 * 2) There might be another process with a final reference,
2834 * waiting on us to finish processing. If this is the case, we
2835 * detect it and exit out - there's no more dentries anyway.
2837 static int ocfs2_dentry_convert_worker(struct ocfs2_lock_res
*lockres
,
2840 struct ocfs2_dentry_lock
*dl
= ocfs2_lock_res_dl(lockres
);
2841 struct ocfs2_inode_info
*oi
= OCFS2_I(dl
->dl_inode
);
2842 struct dentry
*dentry
;
2843 unsigned long flags
;
2847 * This node is blocking another node from getting a read
2848 * lock. This happens when we've renamed within a
2849 * directory. We've forced the other nodes to d_delete(), but
2850 * we never actually dropped our lock because it's still
2851 * valid. The downconvert code will retain a PR for this node,
2852 * so there's no further work to do.
2854 if (blocking
== LKM_PRMODE
)
2855 return UNBLOCK_CONTINUE
;
2858 * Mark this inode as potentially orphaned. The code in
2859 * ocfs2_delete_inode() will figure out whether it actually
2860 * needs to be freed or not.
2862 spin_lock(&oi
->ip_lock
);
2863 oi
->ip_flags
|= OCFS2_INODE_MAYBE_ORPHANED
;
2864 spin_unlock(&oi
->ip_lock
);
2867 * Yuck. We need to make sure however that the check of
2868 * OCFS2_LOCK_FREEING and the extra reference are atomic with
2869 * respect to a reference decrement or the setting of that
2872 spin_lock_irqsave(&lockres
->l_lock
, flags
);
2873 spin_lock(&dentry_attach_lock
);
2874 if (!(lockres
->l_flags
& OCFS2_LOCK_FREEING
)
2879 spin_unlock(&dentry_attach_lock
);
2880 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
2882 mlog(0, "extra_ref = %d\n", extra_ref
);
2885 * We have a process waiting on us in ocfs2_dentry_iput(),
2886 * which means we can't have any more outstanding
2887 * aliases. There's no need to do any more work.
2890 return UNBLOCK_CONTINUE
;
2892 spin_lock(&dentry_attach_lock
);
2894 dentry
= ocfs2_find_local_alias(dl
->dl_inode
,
2895 dl
->dl_parent_blkno
, 1);
2898 spin_unlock(&dentry_attach_lock
);
2900 mlog(0, "d_delete(%.*s);\n", dentry
->d_name
.len
,
2901 dentry
->d_name
.name
);
2904 * The following dcache calls may do an
2905 * iput(). Normally we don't want that from the
2906 * downconverting thread, but in this case it's ok
2907 * because the requesting node already has an
2908 * exclusive lock on the inode, so it can't be queued
2909 * for a downconvert.
2914 spin_lock(&dentry_attach_lock
);
2916 spin_unlock(&dentry_attach_lock
);
2919 * If we are the last holder of this dentry lock, there is no
2920 * reason to downconvert so skip straight to the unlock.
2922 if (dl
->dl_count
== 1)
2923 return UNBLOCK_STOP_POST
;
2925 return UNBLOCK_CONTINUE_POST
;
2928 void ocfs2_process_blocked_lock(struct ocfs2_super
*osb
,
2929 struct ocfs2_lock_res
*lockres
)
2932 struct ocfs2_unblock_ctl ctl
= {0, 0,};
2933 unsigned long flags
;
2935 /* Our reference to the lockres in this function can be
2936 * considered valid until we remove the OCFS2_LOCK_QUEUED
2942 BUG_ON(!lockres
->l_ops
);
2944 mlog(0, "lockres %s blocked.\n", lockres
->l_name
);
2946 /* Detect whether a lock has been marked as going away while
2947 * the downconvert thread was processing other things. A lock can
2948 * still be marked with OCFS2_LOCK_FREEING after this check,
2949 * but short circuiting here will still save us some
2951 spin_lock_irqsave(&lockres
->l_lock
, flags
);
2952 if (lockres
->l_flags
& OCFS2_LOCK_FREEING
)
2954 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
2956 status
= ocfs2_unblock_lock(osb
, lockres
, &ctl
);
2960 spin_lock_irqsave(&lockres
->l_lock
, flags
);
2962 if (lockres
->l_flags
& OCFS2_LOCK_FREEING
|| !ctl
.requeue
) {
2963 lockres_clear_flags(lockres
, OCFS2_LOCK_QUEUED
);
2965 ocfs2_schedule_blocked_lock(osb
, lockres
);
2967 mlog(0, "lockres %s, requeue = %s.\n", lockres
->l_name
,
2968 ctl
.requeue
? "yes" : "no");
2969 spin_unlock_irqrestore(&lockres
->l_lock
, flags
);
2971 if (ctl
.unblock_action
!= UNBLOCK_CONTINUE
2972 && lockres
->l_ops
->post_unlock
)
2973 lockres
->l_ops
->post_unlock(osb
, lockres
);
2978 static void ocfs2_schedule_blocked_lock(struct ocfs2_super
*osb
,
2979 struct ocfs2_lock_res
*lockres
)
2983 assert_spin_locked(&lockres
->l_lock
);
2985 if (lockres
->l_flags
& OCFS2_LOCK_FREEING
) {
2986 /* Do not schedule a lock for downconvert when it's on
2987 * the way to destruction - any nodes wanting access
2988 * to the resource will get it soon. */
2989 mlog(0, "Lockres %s won't be scheduled: flags 0x%lx\n",
2990 lockres
->l_name
, lockres
->l_flags
);
2994 lockres_or_flags(lockres
, OCFS2_LOCK_QUEUED
);
2996 spin_lock(&osb
->dc_task_lock
);
2997 if (list_empty(&lockres
->l_blocked_list
)) {
2998 list_add_tail(&lockres
->l_blocked_list
,
2999 &osb
->blocked_lock_list
);
3000 osb
->blocked_lock_count
++;
3002 spin_unlock(&osb
->dc_task_lock
);
3007 static void ocfs2_downconvert_thread_do_work(struct ocfs2_super
*osb
)
3009 unsigned long processed
;
3010 struct ocfs2_lock_res
*lockres
;
3014 spin_lock(&osb
->dc_task_lock
);
3015 /* grab this early so we know to try again if a state change and
3016 * wake happens part-way through our work */
3017 osb
->dc_work_sequence
= osb
->dc_wake_sequence
;
3019 processed
= osb
->blocked_lock_count
;
3021 BUG_ON(list_empty(&osb
->blocked_lock_list
));
3023 lockres
= list_entry(osb
->blocked_lock_list
.next
,
3024 struct ocfs2_lock_res
, l_blocked_list
);
3025 list_del_init(&lockres
->l_blocked_list
);
3026 osb
->blocked_lock_count
--;
3027 spin_unlock(&osb
->dc_task_lock
);
3032 ocfs2_process_blocked_lock(osb
, lockres
);
3034 spin_lock(&osb
->dc_task_lock
);
3036 spin_unlock(&osb
->dc_task_lock
);
3041 static int ocfs2_downconvert_thread_lists_empty(struct ocfs2_super
*osb
)
3045 spin_lock(&osb
->dc_task_lock
);
3046 if (list_empty(&osb
->blocked_lock_list
))
3049 spin_unlock(&osb
->dc_task_lock
);
3053 static int ocfs2_downconvert_thread_should_wake(struct ocfs2_super
*osb
)
3055 int should_wake
= 0;
3057 spin_lock(&osb
->dc_task_lock
);
3058 if (osb
->dc_work_sequence
!= osb
->dc_wake_sequence
)
3060 spin_unlock(&osb
->dc_task_lock
);
3065 int ocfs2_downconvert_thread(void *arg
)
3068 struct ocfs2_super
*osb
= arg
;
3070 /* only quit once we've been asked to stop and there is no more
3072 while (!(kthread_should_stop() &&
3073 ocfs2_downconvert_thread_lists_empty(osb
))) {
3075 wait_event_interruptible(osb
->dc_event
,
3076 ocfs2_downconvert_thread_should_wake(osb
) ||
3077 kthread_should_stop());
3079 mlog(0, "downconvert_thread: awoken\n");
3081 ocfs2_downconvert_thread_do_work(osb
);
3084 osb
->dc_task
= NULL
;
3088 void ocfs2_wake_downconvert_thread(struct ocfs2_super
*osb
)
3090 spin_lock(&osb
->dc_task_lock
);
3091 /* make sure the voting thread gets a swipe at whatever changes
3092 * the caller may have made to the voting state */
3093 osb
->dc_wake_sequence
++;
3094 spin_unlock(&osb
->dc_task_lock
);
3095 wake_up(&osb
->dc_event
);