1
2
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4
5
6
7#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
8
9#include <linux/sched.h>
10#include <linux/slab.h>
11#include <linux/spinlock.h>
12#include <linux/buffer_head.h>
13#include <linux/delay.h>
14#include <linux/sort.h>
15#include <linux/hash.h>
16#include <linux/jhash.h>
17#include <linux/kallsyms.h>
18#include <linux/gfs2_ondisk.h>
19#include <linux/list.h>
20#include <linux/wait.h>
21#include <linux/module.h>
22#include <linux/uaccess.h>
23#include <linux/seq_file.h>
24#include <linux/debugfs.h>
25#include <linux/kthread.h>
26#include <linux/freezer.h>
27#include <linux/workqueue.h>
28#include <linux/jiffies.h>
29#include <linux/rcupdate.h>
30#include <linux/rculist_bl.h>
31#include <linux/bit_spinlock.h>
32#include <linux/percpu.h>
33#include <linux/list_sort.h>
34#include <linux/lockref.h>
35#include <linux/rhashtable.h>
36
37#include "gfs2.h"
38#include "incore.h"
39#include "glock.h"
40#include "glops.h"
41#include "inode.h"
42#include "lops.h"
43#include "meta_io.h"
44#include "quota.h"
45#include "super.h"
46#include "util.h"
47#include "bmap.h"
48#define CREATE_TRACE_POINTS
49#include "trace_gfs2.h"
50
51struct gfs2_glock_iter {
52 struct gfs2_sbd *sdp;
53 struct rhashtable_iter hti;
54 struct gfs2_glock *gl;
55 loff_t last_pos;
56};
57
58typedef void (*glock_examiner) (struct gfs2_glock * gl);
59
60static void do_xmote(struct gfs2_glock *gl, struct gfs2_holder *gh, unsigned int target);
61
62static struct dentry *gfs2_root;
63static struct workqueue_struct *glock_workqueue;
64struct workqueue_struct *gfs2_delete_workqueue;
65static LIST_HEAD(lru_list);
66static atomic_t lru_count = ATOMIC_INIT(0);
67static DEFINE_SPINLOCK(lru_lock);
68
69#define GFS2_GL_HASH_SHIFT 15
70#define GFS2_GL_HASH_SIZE BIT(GFS2_GL_HASH_SHIFT)
71
72static const struct rhashtable_params ht_parms = {
73 .nelem_hint = GFS2_GL_HASH_SIZE * 3 / 4,
74 .key_len = offsetofend(struct lm_lockname, ln_type),
75 .key_offset = offsetof(struct gfs2_glock, gl_name),
76 .head_offset = offsetof(struct gfs2_glock, gl_node),
77};
78
79static struct rhashtable gl_hash_table;
80
81#define GLOCK_WAIT_TABLE_BITS 12
82#define GLOCK_WAIT_TABLE_SIZE (1 << GLOCK_WAIT_TABLE_BITS)
83static wait_queue_head_t glock_wait_table[GLOCK_WAIT_TABLE_SIZE] __cacheline_aligned;
84
85struct wait_glock_queue {
86 struct lm_lockname *name;
87 wait_queue_entry_t wait;
88};
89
90static int glock_wake_function(wait_queue_entry_t *wait, unsigned int mode,
91 int sync, void *key)
92{
93 struct wait_glock_queue *wait_glock =
94 container_of(wait, struct wait_glock_queue, wait);
95 struct lm_lockname *wait_name = wait_glock->name;
96 struct lm_lockname *wake_name = key;
97
98 if (wake_name->ln_sbd != wait_name->ln_sbd ||
99 wake_name->ln_number != wait_name->ln_number ||
100 wake_name->ln_type != wait_name->ln_type)
101 return 0;
102 return autoremove_wake_function(wait, mode, sync, key);
103}
104
105static wait_queue_head_t *glock_waitqueue(struct lm_lockname *name)
106{
107 u32 hash = jhash2((u32 *)name, ht_parms.key_len / 4, 0);
108
109 return glock_wait_table + hash_32(hash, GLOCK_WAIT_TABLE_BITS);
110}
111
112
113
114
115
116static void wake_up_glock(struct gfs2_glock *gl)
117{
118 wait_queue_head_t *wq = glock_waitqueue(&gl->gl_name);
119
120 if (waitqueue_active(wq))
121 __wake_up(wq, TASK_NORMAL, 1, &gl->gl_name);
122}
123
124static void gfs2_glock_dealloc(struct rcu_head *rcu)
125{
126 struct gfs2_glock *gl = container_of(rcu, struct gfs2_glock, gl_rcu);
127
128 kfree(gl->gl_lksb.sb_lvbptr);
129 if (gl->gl_ops->go_flags & GLOF_ASPACE)
130 kmem_cache_free(gfs2_glock_aspace_cachep, gl);
131 else
132 kmem_cache_free(gfs2_glock_cachep, gl);
133}
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148static bool glock_blocked_by_withdraw(struct gfs2_glock *gl)
149{
150 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
151
152 if (likely(!gfs2_withdrawn(sdp)))
153 return false;
154 if (gl->gl_ops->go_flags & GLOF_NONDISK)
155 return false;
156 if (!sdp->sd_jdesc ||
157 gl->gl_name.ln_number == sdp->sd_jdesc->jd_no_addr)
158 return false;
159 return true;
160}
161
162void gfs2_glock_free(struct gfs2_glock *gl)
163{
164 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
165
166 gfs2_glock_assert_withdraw(gl, atomic_read(&gl->gl_revokes) == 0);
167 rhashtable_remove_fast(&gl_hash_table, &gl->gl_node, ht_parms);
168 smp_mb();
169 wake_up_glock(gl);
170 call_rcu(&gl->gl_rcu, gfs2_glock_dealloc);
171 if (atomic_dec_and_test(&sdp->sd_glock_disposal))
172 wake_up(&sdp->sd_glock_wait);
173}
174
175
176
177
178
179
180
181void gfs2_glock_hold(struct gfs2_glock *gl)
182{
183 GLOCK_BUG_ON(gl, __lockref_is_dead(&gl->gl_lockref));
184 lockref_get(&gl->gl_lockref);
185}
186
187
188
189
190
191
192
193
194static int demote_ok(const struct gfs2_glock *gl)
195{
196 const struct gfs2_glock_operations *glops = gl->gl_ops;
197
198 if (gl->gl_state == LM_ST_UNLOCKED)
199 return 0;
200 if (!list_empty(&gl->gl_holders))
201 return 0;
202 if (glops->go_demote_ok)
203 return glops->go_demote_ok(gl);
204 return 1;
205}
206
207
208void gfs2_glock_add_to_lru(struct gfs2_glock *gl)
209{
210 if (!(gl->gl_ops->go_flags & GLOF_LRU))
211 return;
212
213 spin_lock(&lru_lock);
214
215 list_move_tail(&gl->gl_lru, &lru_list);
216
217 if (!test_bit(GLF_LRU, &gl->gl_flags)) {
218 set_bit(GLF_LRU, &gl->gl_flags);
219 atomic_inc(&lru_count);
220 }
221
222 spin_unlock(&lru_lock);
223}
224
225static void gfs2_glock_remove_from_lru(struct gfs2_glock *gl)
226{
227 if (!(gl->gl_ops->go_flags & GLOF_LRU))
228 return;
229
230 spin_lock(&lru_lock);
231 if (test_bit(GLF_LRU, &gl->gl_flags)) {
232 list_del_init(&gl->gl_lru);
233 atomic_dec(&lru_count);
234 clear_bit(GLF_LRU, &gl->gl_flags);
235 }
236 spin_unlock(&lru_lock);
237}
238
239
240
241
242
243static void __gfs2_glock_queue_work(struct gfs2_glock *gl, unsigned long delay) {
244 if (!queue_delayed_work(glock_workqueue, &gl->gl_work, delay)) {
245
246
247
248
249
250
251 GLOCK_BUG_ON(gl, gl->gl_lockref.count < 2);
252 gl->gl_lockref.count--;
253 }
254}
255
256static void gfs2_glock_queue_work(struct gfs2_glock *gl, unsigned long delay) {
257 spin_lock(&gl->gl_lockref.lock);
258 __gfs2_glock_queue_work(gl, delay);
259 spin_unlock(&gl->gl_lockref.lock);
260}
261
262static void __gfs2_glock_put(struct gfs2_glock *gl)
263{
264 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
265 struct address_space *mapping = gfs2_glock2aspace(gl);
266
267 lockref_mark_dead(&gl->gl_lockref);
268
269 gfs2_glock_remove_from_lru(gl);
270 spin_unlock(&gl->gl_lockref.lock);
271 GLOCK_BUG_ON(gl, !list_empty(&gl->gl_holders));
272 if (mapping) {
273 truncate_inode_pages_final(mapping);
274 if (!gfs2_withdrawn(sdp))
275 GLOCK_BUG_ON(gl, !mapping_empty(mapping));
276 }
277 trace_gfs2_glock_put(gl);
278 sdp->sd_lockstruct.ls_ops->lm_put_lock(gl);
279}
280
281
282
283
284void gfs2_glock_queue_put(struct gfs2_glock *gl)
285{
286 gfs2_glock_queue_work(gl, 0);
287}
288
289
290
291
292
293
294
295void gfs2_glock_put(struct gfs2_glock *gl)
296{
297 if (lockref_put_or_lock(&gl->gl_lockref))
298 return;
299
300 __gfs2_glock_put(gl);
301}
302
303
304
305
306
307
308
309
310
311static inline int may_grant(const struct gfs2_glock *gl, const struct gfs2_holder *gh)
312{
313 const struct gfs2_holder *gh_head = list_first_entry(&gl->gl_holders, const struct gfs2_holder, gh_list);
314
315 if (gh != gh_head) {
316
317
318
319
320
321
322 if (gh_head->gh_state == LM_ST_EXCLUSIVE &&
323 (gh_head->gh_flags & LM_FLAG_NODE_SCOPE) &&
324 gh->gh_state == LM_ST_EXCLUSIVE &&
325 (gh->gh_flags & LM_FLAG_NODE_SCOPE))
326 return 1;
327 if ((gh->gh_state == LM_ST_EXCLUSIVE ||
328 gh_head->gh_state == LM_ST_EXCLUSIVE))
329 return 0;
330 }
331 if (gl->gl_state == gh->gh_state)
332 return 1;
333 if (gh->gh_flags & GL_EXACT)
334 return 0;
335 if (gl->gl_state == LM_ST_EXCLUSIVE) {
336 if (gh->gh_state == LM_ST_SHARED && gh_head->gh_state == LM_ST_SHARED)
337 return 1;
338 if (gh->gh_state == LM_ST_DEFERRED && gh_head->gh_state == LM_ST_DEFERRED)
339 return 1;
340 }
341 if (gl->gl_state != LM_ST_UNLOCKED && (gh->gh_flags & LM_FLAG_ANY))
342 return 1;
343 return 0;
344}
345
346static void gfs2_holder_wake(struct gfs2_holder *gh)
347{
348 clear_bit(HIF_WAIT, &gh->gh_iflags);
349 smp_mb__after_atomic();
350 wake_up_bit(&gh->gh_iflags, HIF_WAIT);
351 if (gh->gh_flags & GL_ASYNC) {
352 struct gfs2_sbd *sdp = gh->gh_gl->gl_name.ln_sbd;
353
354 wake_up(&sdp->sd_async_glock_wait);
355 }
356}
357
358
359
360
361
362
363
364static void do_error(struct gfs2_glock *gl, const int ret)
365{
366 struct gfs2_holder *gh, *tmp;
367
368 list_for_each_entry_safe(gh, tmp, &gl->gl_holders, gh_list) {
369 if (test_bit(HIF_HOLDER, &gh->gh_iflags))
370 continue;
371 if (ret & LM_OUT_ERROR)
372 gh->gh_error = -EIO;
373 else if (gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB))
374 gh->gh_error = GLR_TRYFAILED;
375 else
376 continue;
377 list_del_init(&gh->gh_list);
378 trace_gfs2_glock_queue(gh, 0);
379 gfs2_holder_wake(gh);
380 }
381}
382
383
384
385
386
387
388
389
390
391static int do_promote(struct gfs2_glock *gl)
392__releases(&gl->gl_lockref.lock)
393__acquires(&gl->gl_lockref.lock)
394{
395 const struct gfs2_glock_operations *glops = gl->gl_ops;
396 struct gfs2_holder *gh, *tmp;
397 int ret;
398
399restart:
400 list_for_each_entry_safe(gh, tmp, &gl->gl_holders, gh_list) {
401 if (test_bit(HIF_HOLDER, &gh->gh_iflags))
402 continue;
403 if (may_grant(gl, gh)) {
404 if (gh->gh_list.prev == &gl->gl_holders &&
405 glops->go_lock) {
406 spin_unlock(&gl->gl_lockref.lock);
407
408 ret = glops->go_lock(gh);
409 spin_lock(&gl->gl_lockref.lock);
410 if (ret) {
411 if (ret == 1)
412 return 2;
413 gh->gh_error = ret;
414 list_del_init(&gh->gh_list);
415 trace_gfs2_glock_queue(gh, 0);
416 gfs2_holder_wake(gh);
417 goto restart;
418 }
419 set_bit(HIF_HOLDER, &gh->gh_iflags);
420 trace_gfs2_promote(gh, 1);
421 gfs2_holder_wake(gh);
422 goto restart;
423 }
424 set_bit(HIF_HOLDER, &gh->gh_iflags);
425 trace_gfs2_promote(gh, 0);
426 gfs2_holder_wake(gh);
427 continue;
428 }
429 if (gh->gh_list.prev == &gl->gl_holders)
430 return 1;
431 do_error(gl, 0);
432 break;
433 }
434 return 0;
435}
436
437
438
439
440
441
442static inline struct gfs2_holder *find_first_waiter(const struct gfs2_glock *gl)
443{
444 struct gfs2_holder *gh;
445
446 list_for_each_entry(gh, &gl->gl_holders, gh_list) {
447 if (!test_bit(HIF_HOLDER, &gh->gh_iflags))
448 return gh;
449 }
450 return NULL;
451}
452
453
454
455
456
457
458
459static void state_change(struct gfs2_glock *gl, unsigned int new_state)
460{
461 int held1, held2;
462
463 held1 = (gl->gl_state != LM_ST_UNLOCKED);
464 held2 = (new_state != LM_ST_UNLOCKED);
465
466 if (held1 != held2) {
467 GLOCK_BUG_ON(gl, __lockref_is_dead(&gl->gl_lockref));
468 if (held2)
469 gl->gl_lockref.count++;
470 else
471 gl->gl_lockref.count--;
472 }
473 if (new_state != gl->gl_target)
474
475 gl->gl_hold_time = max(gl->gl_hold_time - GL_GLOCK_HOLD_DECR,
476 GL_GLOCK_MIN_HOLD);
477 gl->gl_state = new_state;
478 gl->gl_tchange = jiffies;
479}
480
481static void gfs2_set_demote(struct gfs2_glock *gl)
482{
483 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
484
485 set_bit(GLF_DEMOTE, &gl->gl_flags);
486 smp_mb();
487 wake_up(&sdp->sd_async_glock_wait);
488}
489
490static void gfs2_demote_wake(struct gfs2_glock *gl)
491{
492 gl->gl_demote_state = LM_ST_EXCLUSIVE;
493 clear_bit(GLF_DEMOTE, &gl->gl_flags);
494 smp_mb__after_atomic();
495 wake_up_bit(&gl->gl_flags, GLF_DEMOTE);
496}
497
498
499
500
501
502
503
504
505static void finish_xmote(struct gfs2_glock *gl, unsigned int ret)
506{
507 const struct gfs2_glock_operations *glops = gl->gl_ops;
508 struct gfs2_holder *gh;
509 unsigned state = ret & LM_OUT_ST_MASK;
510 int rv;
511
512 spin_lock(&gl->gl_lockref.lock);
513 trace_gfs2_glock_state_change(gl, state);
514 state_change(gl, state);
515 gh = find_first_waiter(gl);
516
517
518 if (test_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags) &&
519 state != LM_ST_UNLOCKED && gl->gl_demote_state == LM_ST_UNLOCKED)
520 gl->gl_target = LM_ST_UNLOCKED;
521
522
523 if (unlikely(state != gl->gl_target)) {
524 if (gh && !test_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags)) {
525
526 if (ret & LM_OUT_CANCELED) {
527 if ((gh->gh_flags & LM_FLAG_PRIORITY) == 0)
528 list_move_tail(&gh->gh_list, &gl->gl_holders);
529 gh = find_first_waiter(gl);
530 gl->gl_target = gh->gh_state;
531 goto retry;
532 }
533
534 if ((ret & LM_OUT_ERROR) ||
535 (gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB))) {
536 gl->gl_target = gl->gl_state;
537 do_error(gl, ret);
538 goto out;
539 }
540 }
541 switch(state) {
542
543 case LM_ST_UNLOCKED:
544retry:
545 do_xmote(gl, gh, gl->gl_target);
546 break;
547
548 case LM_ST_SHARED:
549 case LM_ST_DEFERRED:
550 do_xmote(gl, gh, LM_ST_UNLOCKED);
551 break;
552 default:
553 fs_err(gl->gl_name.ln_sbd, "wanted %u got %u\n",
554 gl->gl_target, state);
555 GLOCK_BUG_ON(gl, 1);
556 }
557 spin_unlock(&gl->gl_lockref.lock);
558 return;
559 }
560
561
562 if (test_and_clear_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags))
563 gfs2_demote_wake(gl);
564 if (state != LM_ST_UNLOCKED) {
565 if (glops->go_xmote_bh) {
566 spin_unlock(&gl->gl_lockref.lock);
567 rv = glops->go_xmote_bh(gl);
568 spin_lock(&gl->gl_lockref.lock);
569 if (rv) {
570 do_error(gl, rv);
571 goto out;
572 }
573 }
574 rv = do_promote(gl);
575 if (rv == 2)
576 goto out_locked;
577 }
578out:
579 clear_bit(GLF_LOCK, &gl->gl_flags);
580out_locked:
581 spin_unlock(&gl->gl_lockref.lock);
582}
583
584static bool is_system_glock(struct gfs2_glock *gl)
585{
586 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
587 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
588
589 if (gl == m_ip->i_gl)
590 return true;
591 return false;
592}
593
594
595
596
597
598
599
600
601
602static void do_xmote(struct gfs2_glock *gl, struct gfs2_holder *gh, unsigned int target)
603__releases(&gl->gl_lockref.lock)
604__acquires(&gl->gl_lockref.lock)
605{
606 const struct gfs2_glock_operations *glops = gl->gl_ops;
607 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
608 unsigned int lck_flags = (unsigned int)(gh ? gh->gh_flags : 0);
609 int ret;
610
611 if (target != LM_ST_UNLOCKED && glock_blocked_by_withdraw(gl) &&
612 gh && !(gh->gh_flags & LM_FLAG_NOEXP))
613 return;
614 lck_flags &= (LM_FLAG_TRY | LM_FLAG_TRY_1CB | LM_FLAG_NOEXP |
615 LM_FLAG_PRIORITY);
616 GLOCK_BUG_ON(gl, gl->gl_state == target);
617 GLOCK_BUG_ON(gl, gl->gl_state == gl->gl_target);
618 if ((target == LM_ST_UNLOCKED || target == LM_ST_DEFERRED) &&
619 glops->go_inval) {
620
621
622
623
624
625 if (test_and_set_bit(GLF_INVALIDATE_IN_PROGRESS,
626 &gl->gl_flags))
627 return;
628 do_error(gl, 0);
629 }
630 gl->gl_req = target;
631 set_bit(GLF_BLOCKING, &gl->gl_flags);
632 if ((gl->gl_req == LM_ST_UNLOCKED) ||
633 (gl->gl_state == LM_ST_EXCLUSIVE) ||
634 (lck_flags & (LM_FLAG_TRY|LM_FLAG_TRY_1CB)))
635 clear_bit(GLF_BLOCKING, &gl->gl_flags);
636 spin_unlock(&gl->gl_lockref.lock);
637 if (glops->go_sync) {
638 ret = glops->go_sync(gl);
639
640
641
642
643 if (ret) {
644 if (cmpxchg(&sdp->sd_log_error, 0, ret)) {
645 fs_err(sdp, "Error %d syncing glock \n", ret);
646 gfs2_dump_glock(NULL, gl, true);
647 }
648 goto skip_inval;
649 }
650 }
651 if (test_bit(GLF_INVALIDATE_IN_PROGRESS, &gl->gl_flags)) {
652
653
654
655
656
657
658
659 if ((atomic_read(&gl->gl_ail_count) != 0) &&
660 (!cmpxchg(&sdp->sd_log_error, 0, -EIO))) {
661 gfs2_glock_assert_warn(gl,
662 !atomic_read(&gl->gl_ail_count));
663 gfs2_dump_glock(NULL, gl, true);
664 }
665 glops->go_inval(gl, target == LM_ST_DEFERRED ? 0 : DIO_METADATA);
666 clear_bit(GLF_INVALIDATE_IN_PROGRESS, &gl->gl_flags);
667 }
668
669skip_inval:
670 gfs2_glock_hold(gl);
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692 if (unlikely(sdp->sd_log_error && !gfs2_withdrawn(sdp)))
693 gfs2_withdraw_delayed(sdp);
694 if (glock_blocked_by_withdraw(gl) &&
695 (target != LM_ST_UNLOCKED ||
696 test_bit(SDF_WITHDRAW_RECOVERY, &sdp->sd_flags))) {
697 if (!is_system_glock(gl)) {
698 gfs2_glock_queue_work(gl, GL_GLOCK_DFT_HOLD);
699 goto out;
700 } else {
701 clear_bit(GLF_INVALIDATE_IN_PROGRESS, &gl->gl_flags);
702 }
703 }
704
705 if (sdp->sd_lockstruct.ls_ops->lm_lock) {
706
707 ret = sdp->sd_lockstruct.ls_ops->lm_lock(gl, target, lck_flags);
708 if (ret == -EINVAL && gl->gl_target == LM_ST_UNLOCKED &&
709 target == LM_ST_UNLOCKED &&
710 test_bit(SDF_SKIP_DLM_UNLOCK, &sdp->sd_flags)) {
711 finish_xmote(gl, target);
712 gfs2_glock_queue_work(gl, 0);
713 } else if (ret) {
714 fs_err(sdp, "lm_lock ret %d\n", ret);
715 GLOCK_BUG_ON(gl, !gfs2_withdrawn(sdp));
716 }
717 } else {
718 finish_xmote(gl, target);
719 gfs2_glock_queue_work(gl, 0);
720 }
721out:
722 spin_lock(&gl->gl_lockref.lock);
723}
724
725
726
727
728
729
730static inline struct gfs2_holder *find_first_holder(const struct gfs2_glock *gl)
731{
732 struct gfs2_holder *gh;
733
734 if (!list_empty(&gl->gl_holders)) {
735 gh = list_first_entry(&gl->gl_holders, struct gfs2_holder, gh_list);
736 if (test_bit(HIF_HOLDER, &gh->gh_iflags))
737 return gh;
738 }
739 return NULL;
740}
741
742
743
744
745
746
747
748
749static void run_queue(struct gfs2_glock *gl, const int nonblock)
750__releases(&gl->gl_lockref.lock)
751__acquires(&gl->gl_lockref.lock)
752{
753 struct gfs2_holder *gh = NULL;
754 int ret;
755
756 if (test_and_set_bit(GLF_LOCK, &gl->gl_flags))
757 return;
758
759 GLOCK_BUG_ON(gl, test_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags));
760
761 if (test_bit(GLF_DEMOTE, &gl->gl_flags) &&
762 gl->gl_demote_state != gl->gl_state) {
763 if (find_first_holder(gl))
764 goto out_unlock;
765 if (nonblock)
766 goto out_sched;
767 set_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags);
768 GLOCK_BUG_ON(gl, gl->gl_demote_state == LM_ST_EXCLUSIVE);
769 gl->gl_target = gl->gl_demote_state;
770 } else {
771 if (test_bit(GLF_DEMOTE, &gl->gl_flags))
772 gfs2_demote_wake(gl);
773 ret = do_promote(gl);
774 if (ret == 0)
775 goto out_unlock;
776 if (ret == 2)
777 goto out;
778 gh = find_first_waiter(gl);
779 gl->gl_target = gh->gh_state;
780 if (!(gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB)))
781 do_error(gl, 0);
782 }
783 do_xmote(gl, gh, gl->gl_target);
784out:
785 return;
786
787out_sched:
788 clear_bit(GLF_LOCK, &gl->gl_flags);
789 smp_mb__after_atomic();
790 gl->gl_lockref.count++;
791 __gfs2_glock_queue_work(gl, 0);
792 return;
793
794out_unlock:
795 clear_bit(GLF_LOCK, &gl->gl_flags);
796 smp_mb__after_atomic();
797 return;
798}
799
800void gfs2_inode_remember_delete(struct gfs2_glock *gl, u64 generation)
801{
802 struct gfs2_inode_lvb *ri = (void *)gl->gl_lksb.sb_lvbptr;
803
804 if (ri->ri_magic == 0)
805 ri->ri_magic = cpu_to_be32(GFS2_MAGIC);
806 if (ri->ri_magic == cpu_to_be32(GFS2_MAGIC))
807 ri->ri_generation_deleted = cpu_to_be64(generation);
808}
809
810bool gfs2_inode_already_deleted(struct gfs2_glock *gl, u64 generation)
811{
812 struct gfs2_inode_lvb *ri = (void *)gl->gl_lksb.sb_lvbptr;
813
814 if (ri->ri_magic != cpu_to_be32(GFS2_MAGIC))
815 return false;
816 return generation <= be64_to_cpu(ri->ri_generation_deleted);
817}
818
819static void gfs2_glock_poke(struct gfs2_glock *gl)
820{
821 int flags = LM_FLAG_TRY_1CB | LM_FLAG_ANY | GL_SKIP;
822 struct gfs2_holder gh;
823 int error;
824
825 gfs2_holder_init(gl, LM_ST_SHARED, flags, &gh);
826 error = gfs2_glock_nq(&gh);
827 if (!error)
828 gfs2_glock_dq(&gh);
829 gfs2_holder_uninit(&gh);
830}
831
832static bool gfs2_try_evict(struct gfs2_glock *gl)
833{
834 struct gfs2_inode *ip;
835 bool evicted = false;
836
837
838
839
840
841
842
843
844
845
846
847 spin_lock(&gl->gl_lockref.lock);
848 ip = gl->gl_object;
849 if (ip && !igrab(&ip->i_inode))
850 ip = NULL;
851 spin_unlock(&gl->gl_lockref.lock);
852 if (ip) {
853 struct gfs2_glock *inode_gl = NULL;
854
855 gl->gl_no_formal_ino = ip->i_no_formal_ino;
856 set_bit(GIF_DEFERRED_DELETE, &ip->i_flags);
857 d_prune_aliases(&ip->i_inode);
858 iput(&ip->i_inode);
859
860
861 spin_lock(&gl->gl_lockref.lock);
862 ip = gl->gl_object;
863 if (ip) {
864 inode_gl = ip->i_gl;
865 lockref_get(&inode_gl->gl_lockref);
866 clear_bit(GIF_DEFERRED_DELETE, &ip->i_flags);
867 }
868 spin_unlock(&gl->gl_lockref.lock);
869 if (inode_gl) {
870 gfs2_glock_poke(inode_gl);
871 gfs2_glock_put(inode_gl);
872 }
873 evicted = !ip;
874 }
875 return evicted;
876}
877
878static void delete_work_func(struct work_struct *work)
879{
880 struct delayed_work *dwork = to_delayed_work(work);
881 struct gfs2_glock *gl = container_of(dwork, struct gfs2_glock, gl_delete);
882 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
883 struct inode *inode;
884 u64 no_addr = gl->gl_name.ln_number;
885
886 spin_lock(&gl->gl_lockref.lock);
887 clear_bit(GLF_PENDING_DELETE, &gl->gl_flags);
888 spin_unlock(&gl->gl_lockref.lock);
889
890 if (test_bit(GLF_DEMOTE, &gl->gl_flags)) {
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908 if (gfs2_try_evict(gl)) {
909 if (gfs2_queue_delete_work(gl, 5 * HZ))
910 return;
911 }
912 goto out;
913 }
914
915 inode = gfs2_lookup_by_inum(sdp, no_addr, gl->gl_no_formal_ino,
916 GFS2_BLKST_UNLINKED);
917 if (!IS_ERR_OR_NULL(inode)) {
918 d_prune_aliases(inode);
919 iput(inode);
920 }
921out:
922 gfs2_glock_put(gl);
923}
924
925static void glock_work_func(struct work_struct *work)
926{
927 unsigned long delay = 0;
928 struct gfs2_glock *gl = container_of(work, struct gfs2_glock, gl_work.work);
929 unsigned int drop_refs = 1;
930
931 if (test_and_clear_bit(GLF_REPLY_PENDING, &gl->gl_flags)) {
932 finish_xmote(gl, gl->gl_reply);
933 drop_refs++;
934 }
935 spin_lock(&gl->gl_lockref.lock);
936 if (test_bit(GLF_PENDING_DEMOTE, &gl->gl_flags) &&
937 gl->gl_state != LM_ST_UNLOCKED &&
938 gl->gl_demote_state != LM_ST_EXCLUSIVE) {
939 unsigned long holdtime, now = jiffies;
940
941 holdtime = gl->gl_tchange + gl->gl_hold_time;
942 if (time_before(now, holdtime))
943 delay = holdtime - now;
944
945 if (!delay) {
946 clear_bit(GLF_PENDING_DEMOTE, &gl->gl_flags);
947 gfs2_set_demote(gl);
948 }
949 }
950 run_queue(gl, 0);
951 if (delay) {
952
953 drop_refs--;
954 if (gl->gl_name.ln_type != LM_TYPE_INODE)
955 delay = 0;
956 __gfs2_glock_queue_work(gl, delay);
957 }
958
959
960
961
962
963
964 gl->gl_lockref.count -= drop_refs;
965 if (!gl->gl_lockref.count) {
966 __gfs2_glock_put(gl);
967 return;
968 }
969 spin_unlock(&gl->gl_lockref.lock);
970}
971
972static struct gfs2_glock *find_insert_glock(struct lm_lockname *name,
973 struct gfs2_glock *new)
974{
975 struct wait_glock_queue wait;
976 wait_queue_head_t *wq = glock_waitqueue(name);
977 struct gfs2_glock *gl;
978
979 wait.name = name;
980 init_wait(&wait.wait);
981 wait.wait.func = glock_wake_function;
982
983again:
984 prepare_to_wait(wq, &wait.wait, TASK_UNINTERRUPTIBLE);
985 rcu_read_lock();
986 if (new) {
987 gl = rhashtable_lookup_get_insert_fast(&gl_hash_table,
988 &new->gl_node, ht_parms);
989 if (IS_ERR(gl))
990 goto out;
991 } else {
992 gl = rhashtable_lookup_fast(&gl_hash_table,
993 name, ht_parms);
994 }
995 if (gl && !lockref_get_not_dead(&gl->gl_lockref)) {
996 rcu_read_unlock();
997 schedule();
998 goto again;
999 }
1000out:
1001 rcu_read_unlock();
1002 finish_wait(wq, &wait.wait);
1003 return gl;
1004}
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019int gfs2_glock_get(struct gfs2_sbd *sdp, u64 number,
1020 const struct gfs2_glock_operations *glops, int create,
1021 struct gfs2_glock **glp)
1022{
1023 struct super_block *s = sdp->sd_vfs;
1024 struct lm_lockname name = { .ln_number = number,
1025 .ln_type = glops->go_type,
1026 .ln_sbd = sdp };
1027 struct gfs2_glock *gl, *tmp;
1028 struct address_space *mapping;
1029 struct kmem_cache *cachep;
1030 int ret = 0;
1031
1032 gl = find_insert_glock(&name, NULL);
1033 if (gl) {
1034 *glp = gl;
1035 return 0;
1036 }
1037 if (!create)
1038 return -ENOENT;
1039
1040 if (glops->go_flags & GLOF_ASPACE)
1041 cachep = gfs2_glock_aspace_cachep;
1042 else
1043 cachep = gfs2_glock_cachep;
1044 gl = kmem_cache_alloc(cachep, GFP_NOFS);
1045 if (!gl)
1046 return -ENOMEM;
1047
1048 memset(&gl->gl_lksb, 0, sizeof(struct dlm_lksb));
1049
1050 if (glops->go_flags & GLOF_LVB) {
1051 gl->gl_lksb.sb_lvbptr = kzalloc(GDLM_LVB_SIZE, GFP_NOFS);
1052 if (!gl->gl_lksb.sb_lvbptr) {
1053 kmem_cache_free(cachep, gl);
1054 return -ENOMEM;
1055 }
1056 }
1057
1058 atomic_inc(&sdp->sd_glock_disposal);
1059 gl->gl_node.next = NULL;
1060 gl->gl_flags = 0;
1061 gl->gl_name = name;
1062 lockdep_set_subclass(&gl->gl_lockref.lock, glops->go_subclass);
1063 gl->gl_lockref.count = 1;
1064 gl->gl_state = LM_ST_UNLOCKED;
1065 gl->gl_target = LM_ST_UNLOCKED;
1066 gl->gl_demote_state = LM_ST_EXCLUSIVE;
1067 gl->gl_ops = glops;
1068 gl->gl_dstamp = 0;
1069 preempt_disable();
1070
1071 gl->gl_stats = this_cpu_ptr(sdp->sd_lkstats)->lkstats[glops->go_type];
1072 preempt_enable();
1073 gl->gl_stats.stats[GFS2_LKS_DCOUNT] = 0;
1074 gl->gl_stats.stats[GFS2_LKS_QCOUNT] = 0;
1075 gl->gl_tchange = jiffies;
1076 gl->gl_object = NULL;
1077 gl->gl_hold_time = GL_GLOCK_DFT_HOLD;
1078 INIT_DELAYED_WORK(&gl->gl_work, glock_work_func);
1079 if (gl->gl_name.ln_type == LM_TYPE_IOPEN)
1080 INIT_DELAYED_WORK(&gl->gl_delete, delete_work_func);
1081
1082 mapping = gfs2_glock2aspace(gl);
1083 if (mapping) {
1084 mapping->a_ops = &gfs2_meta_aops;
1085 mapping->host = s->s_bdev->bd_inode;
1086 mapping->flags = 0;
1087 mapping_set_gfp_mask(mapping, GFP_NOFS);
1088 mapping->private_data = NULL;
1089 mapping->writeback_index = 0;
1090 }
1091
1092 tmp = find_insert_glock(&name, gl);
1093 if (!tmp) {
1094 *glp = gl;
1095 goto out;
1096 }
1097 if (IS_ERR(tmp)) {
1098 ret = PTR_ERR(tmp);
1099 goto out_free;
1100 }
1101 *glp = tmp;
1102
1103out_free:
1104 kfree(gl->gl_lksb.sb_lvbptr);
1105 kmem_cache_free(cachep, gl);
1106 if (atomic_dec_and_test(&sdp->sd_glock_disposal))
1107 wake_up(&sdp->sd_glock_wait);
1108
1109out:
1110 return ret;
1111}
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state, u16 flags,
1123 struct gfs2_holder *gh)
1124{
1125 INIT_LIST_HEAD(&gh->gh_list);
1126 gh->gh_gl = gl;
1127 gh->gh_ip = _RET_IP_;
1128 gh->gh_owner_pid = get_pid(task_pid(current));
1129 gh->gh_state = state;
1130 gh->gh_flags = flags;
1131 gh->gh_error = 0;
1132 gh->gh_iflags = 0;
1133 gfs2_glock_hold(gl);
1134}
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146void gfs2_holder_reinit(unsigned int state, u16 flags, struct gfs2_holder *gh)
1147{
1148 gh->gh_state = state;
1149 gh->gh_flags = flags;
1150 gh->gh_iflags = 0;
1151 gh->gh_ip = _RET_IP_;
1152 put_pid(gh->gh_owner_pid);
1153 gh->gh_owner_pid = get_pid(task_pid(current));
1154}
1155
1156
1157
1158
1159
1160
1161
1162void gfs2_holder_uninit(struct gfs2_holder *gh)
1163{
1164 put_pid(gh->gh_owner_pid);
1165 gfs2_glock_put(gh->gh_gl);
1166 gfs2_holder_mark_uninitialized(gh);
1167 gh->gh_ip = 0;
1168}
1169
1170static void gfs2_glock_update_hold_time(struct gfs2_glock *gl,
1171 unsigned long start_time)
1172{
1173
1174 if (time_after(jiffies, start_time + HZ)) {
1175
1176 gl->gl_hold_time = min(gl->gl_hold_time + GL_GLOCK_HOLD_INCR,
1177 GL_GLOCK_MAX_HOLD);
1178 }
1179}
1180
1181
1182
1183
1184
1185
1186
1187
1188int gfs2_glock_wait(struct gfs2_holder *gh)
1189{
1190 unsigned long start_time = jiffies;
1191
1192 might_sleep();
1193 wait_on_bit(&gh->gh_iflags, HIF_WAIT, TASK_UNINTERRUPTIBLE);
1194 gfs2_glock_update_hold_time(gh->gh_gl, start_time);
1195 return gh->gh_error;
1196}
1197
1198static int glocks_pending(unsigned int num_gh, struct gfs2_holder *ghs)
1199{
1200 int i;
1201
1202 for (i = 0; i < num_gh; i++)
1203 if (test_bit(HIF_WAIT, &ghs[i].gh_iflags))
1204 return 1;
1205 return 0;
1206}
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218int gfs2_glock_async_wait(unsigned int num_gh, struct gfs2_holder *ghs)
1219{
1220 struct gfs2_sbd *sdp = ghs[0].gh_gl->gl_name.ln_sbd;
1221 int i, ret = 0, timeout = 0;
1222 unsigned long start_time = jiffies;
1223 bool keep_waiting;
1224
1225 might_sleep();
1226
1227
1228
1229
1230 for (i = 0; i < num_gh; i++)
1231 timeout += ghs[i].gh_gl->gl_hold_time << 1;
1232
1233wait_for_dlm:
1234 if (!wait_event_timeout(sdp->sd_async_glock_wait,
1235 !glocks_pending(num_gh, ghs), timeout))
1236 ret = -ESTALE;
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252 keep_waiting = false;
1253 for (i = 0; i < num_gh; i++) {
1254
1255 if (!gfs2_holder_queued(&ghs[i]))
1256 continue;
1257
1258 if (test_bit(HIF_WAIT, &ghs[i].gh_iflags)) {
1259 keep_waiting = true;
1260 continue;
1261 }
1262
1263 if (test_bit(HIF_HOLDER, &ghs[i].gh_iflags)) {
1264 if (ret == -ESTALE)
1265 gfs2_glock_dq(&ghs[i]);
1266 else
1267 gfs2_glock_update_hold_time(ghs[i].gh_gl,
1268 start_time);
1269 }
1270 if (!ret)
1271 ret = ghs[i].gh_error;
1272 }
1273
1274 if (keep_waiting)
1275 goto wait_for_dlm;
1276
1277
1278
1279
1280 return ret;
1281}
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294static void handle_callback(struct gfs2_glock *gl, unsigned int state,
1295 unsigned long delay, bool remote)
1296{
1297 if (delay)
1298 set_bit(GLF_PENDING_DEMOTE, &gl->gl_flags);
1299 else
1300 gfs2_set_demote(gl);
1301 if (gl->gl_demote_state == LM_ST_EXCLUSIVE) {
1302 gl->gl_demote_state = state;
1303 gl->gl_demote_time = jiffies;
1304 } else if (gl->gl_demote_state != LM_ST_UNLOCKED &&
1305 gl->gl_demote_state != state) {
1306 gl->gl_demote_state = LM_ST_UNLOCKED;
1307 }
1308 if (gl->gl_ops->go_callback)
1309 gl->gl_ops->go_callback(gl, remote);
1310 trace_gfs2_demote_rq(gl, remote);
1311}
1312
1313void gfs2_print_dbg(struct seq_file *seq, const char *fmt, ...)
1314{
1315 struct va_format vaf;
1316 va_list args;
1317
1318 va_start(args, fmt);
1319
1320 if (seq) {
1321 seq_vprintf(seq, fmt, args);
1322 } else {
1323 vaf.fmt = fmt;
1324 vaf.va = &args;
1325
1326 pr_err("%pV", &vaf);
1327 }
1328
1329 va_end(args);
1330}
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342static inline void add_to_queue(struct gfs2_holder *gh)
1343__releases(&gl->gl_lockref.lock)
1344__acquires(&gl->gl_lockref.lock)
1345{
1346 struct gfs2_glock *gl = gh->gh_gl;
1347 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
1348 struct list_head *insert_pt = NULL;
1349 struct gfs2_holder *gh2;
1350 int try_futile = 0;
1351
1352 GLOCK_BUG_ON(gl, gh->gh_owner_pid == NULL);
1353 if (test_and_set_bit(HIF_WAIT, &gh->gh_iflags))
1354 GLOCK_BUG_ON(gl, true);
1355
1356 if (gh->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB)) {
1357 if (test_bit(GLF_LOCK, &gl->gl_flags))
1358 try_futile = !may_grant(gl, gh);
1359 if (test_bit(GLF_INVALIDATE_IN_PROGRESS, &gl->gl_flags))
1360 goto fail;
1361 }
1362
1363 list_for_each_entry(gh2, &gl->gl_holders, gh_list) {
1364 if (unlikely(gh2->gh_owner_pid == gh->gh_owner_pid &&
1365 (gh->gh_gl->gl_ops->go_type != LM_TYPE_FLOCK)))
1366 goto trap_recursive;
1367 if (try_futile &&
1368 !(gh2->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB))) {
1369fail:
1370 gh->gh_error = GLR_TRYFAILED;
1371 gfs2_holder_wake(gh);
1372 return;
1373 }
1374 if (test_bit(HIF_HOLDER, &gh2->gh_iflags))
1375 continue;
1376 if (unlikely((gh->gh_flags & LM_FLAG_PRIORITY) && !insert_pt))
1377 insert_pt = &gh2->gh_list;
1378 }
1379 trace_gfs2_glock_queue(gh, 1);
1380 gfs2_glstats_inc(gl, GFS2_LKS_QCOUNT);
1381 gfs2_sbstats_inc(gl, GFS2_LKS_QCOUNT);
1382 if (likely(insert_pt == NULL)) {
1383 list_add_tail(&gh->gh_list, &gl->gl_holders);
1384 if (unlikely(gh->gh_flags & LM_FLAG_PRIORITY))
1385 goto do_cancel;
1386 return;
1387 }
1388 list_add_tail(&gh->gh_list, insert_pt);
1389do_cancel:
1390 gh = list_first_entry(&gl->gl_holders, struct gfs2_holder, gh_list);
1391 if (!(gh->gh_flags & LM_FLAG_PRIORITY)) {
1392 spin_unlock(&gl->gl_lockref.lock);
1393 if (sdp->sd_lockstruct.ls_ops->lm_cancel)
1394 sdp->sd_lockstruct.ls_ops->lm_cancel(gl);
1395 spin_lock(&gl->gl_lockref.lock);
1396 }
1397 return;
1398
1399trap_recursive:
1400 fs_err(sdp, "original: %pSR\n", (void *)gh2->gh_ip);
1401 fs_err(sdp, "pid: %d\n", pid_nr(gh2->gh_owner_pid));
1402 fs_err(sdp, "lock type: %d req lock state : %d\n",
1403 gh2->gh_gl->gl_name.ln_type, gh2->gh_state);
1404 fs_err(sdp, "new: %pSR\n", (void *)gh->gh_ip);
1405 fs_err(sdp, "pid: %d\n", pid_nr(gh->gh_owner_pid));
1406 fs_err(sdp, "lock type: %d req lock state : %d\n",
1407 gh->gh_gl->gl_name.ln_type, gh->gh_state);
1408 gfs2_dump_glock(NULL, gl, true);
1409 BUG();
1410}
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421int gfs2_glock_nq(struct gfs2_holder *gh)
1422{
1423 struct gfs2_glock *gl = gh->gh_gl;
1424 int error = 0;
1425
1426 if (glock_blocked_by_withdraw(gl) && !(gh->gh_flags & LM_FLAG_NOEXP))
1427 return -EIO;
1428
1429 if (test_bit(GLF_LRU, &gl->gl_flags))
1430 gfs2_glock_remove_from_lru(gl);
1431
1432 spin_lock(&gl->gl_lockref.lock);
1433 add_to_queue(gh);
1434 if (unlikely((LM_FLAG_NOEXP & gh->gh_flags) &&
1435 test_and_clear_bit(GLF_FROZEN, &gl->gl_flags))) {
1436 set_bit(GLF_REPLY_PENDING, &gl->gl_flags);
1437 gl->gl_lockref.count++;
1438 __gfs2_glock_queue_work(gl, 0);
1439 }
1440 run_queue(gl, 1);
1441 spin_unlock(&gl->gl_lockref.lock);
1442
1443 if (!(gh->gh_flags & GL_ASYNC))
1444 error = gfs2_glock_wait(gh);
1445
1446 return error;
1447}
1448
1449
1450
1451
1452
1453
1454
1455
1456int gfs2_glock_poll(struct gfs2_holder *gh)
1457{
1458 return test_bit(HIF_WAIT, &gh->gh_iflags) ? 0 : 1;
1459}
1460
1461
1462
1463
1464
1465
1466
1467void gfs2_glock_dq(struct gfs2_holder *gh)
1468{
1469 struct gfs2_glock *gl = gh->gh_gl;
1470 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
1471 unsigned delay = 0;
1472 int fast_path = 0;
1473
1474 spin_lock(&gl->gl_lockref.lock);
1475
1476
1477
1478
1479
1480
1481
1482 if (test_bit(SDF_WITHDRAW_RECOVERY, &sdp->sd_flags) &&
1483 glock_blocked_by_withdraw(gl) &&
1484 gh->gh_gl != sdp->sd_jinode_gl) {
1485 sdp->sd_glock_dqs_held++;
1486 spin_unlock(&gl->gl_lockref.lock);
1487 might_sleep();
1488 wait_on_bit(&sdp->sd_flags, SDF_WITHDRAW_RECOVERY,
1489 TASK_UNINTERRUPTIBLE);
1490 spin_lock(&gl->gl_lockref.lock);
1491 }
1492 if (gh->gh_flags & GL_NOCACHE)
1493 handle_callback(gl, LM_ST_UNLOCKED, 0, false);
1494
1495 list_del_init(&gh->gh_list);
1496 clear_bit(HIF_HOLDER, &gh->gh_iflags);
1497 if (find_first_holder(gl) == NULL) {
1498 if (list_empty(&gl->gl_holders) &&
1499 !test_bit(GLF_PENDING_DEMOTE, &gl->gl_flags) &&
1500 !test_bit(GLF_DEMOTE, &gl->gl_flags))
1501 fast_path = 1;
1502 }
1503 if (!test_bit(GLF_LFLUSH, &gl->gl_flags) && demote_ok(gl))
1504 gfs2_glock_add_to_lru(gl);
1505
1506 trace_gfs2_glock_queue(gh, 0);
1507 if (unlikely(!fast_path)) {
1508 gl->gl_lockref.count++;
1509 if (test_bit(GLF_PENDING_DEMOTE, &gl->gl_flags) &&
1510 !test_bit(GLF_DEMOTE, &gl->gl_flags) &&
1511 gl->gl_name.ln_type == LM_TYPE_INODE)
1512 delay = gl->gl_hold_time;
1513 __gfs2_glock_queue_work(gl, delay);
1514 }
1515 spin_unlock(&gl->gl_lockref.lock);
1516}
1517
1518void gfs2_glock_dq_wait(struct gfs2_holder *gh)
1519{
1520 struct gfs2_glock *gl = gh->gh_gl;
1521 gfs2_glock_dq(gh);
1522 might_sleep();
1523 wait_on_bit(&gl->gl_flags, GLF_DEMOTE, TASK_UNINTERRUPTIBLE);
1524}
1525
1526
1527
1528
1529
1530
1531
1532void gfs2_glock_dq_uninit(struct gfs2_holder *gh)
1533{
1534 gfs2_glock_dq(gh);
1535 gfs2_holder_uninit(gh);
1536}
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550int gfs2_glock_nq_num(struct gfs2_sbd *sdp, u64 number,
1551 const struct gfs2_glock_operations *glops,
1552 unsigned int state, u16 flags, struct gfs2_holder *gh)
1553{
1554 struct gfs2_glock *gl;
1555 int error;
1556
1557 error = gfs2_glock_get(sdp, number, glops, CREATE, &gl);
1558 if (!error) {
1559 error = gfs2_glock_nq_init(gl, state, flags, gh);
1560 gfs2_glock_put(gl);
1561 }
1562
1563 return error;
1564}
1565
1566
1567
1568
1569
1570
1571
1572
1573static int glock_compare(const void *arg_a, const void *arg_b)
1574{
1575 const struct gfs2_holder *gh_a = *(const struct gfs2_holder **)arg_a;
1576 const struct gfs2_holder *gh_b = *(const struct gfs2_holder **)arg_b;
1577 const struct lm_lockname *a = &gh_a->gh_gl->gl_name;
1578 const struct lm_lockname *b = &gh_b->gh_gl->gl_name;
1579
1580 if (a->ln_number > b->ln_number)
1581 return 1;
1582 if (a->ln_number < b->ln_number)
1583 return -1;
1584 BUG_ON(gh_a->gh_gl->gl_ops->go_type == gh_b->gh_gl->gl_ops->go_type);
1585 return 0;
1586}
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598static int nq_m_sync(unsigned int num_gh, struct gfs2_holder *ghs,
1599 struct gfs2_holder **p)
1600{
1601 unsigned int x;
1602 int error = 0;
1603
1604 for (x = 0; x < num_gh; x++)
1605 p[x] = &ghs[x];
1606
1607 sort(p, num_gh, sizeof(struct gfs2_holder *), glock_compare, NULL);
1608
1609 for (x = 0; x < num_gh; x++) {
1610 p[x]->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC);
1611
1612 error = gfs2_glock_nq(p[x]);
1613 if (error) {
1614 while (x--)
1615 gfs2_glock_dq(p[x]);
1616 break;
1617 }
1618 }
1619
1620 return error;
1621}
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633int gfs2_glock_nq_m(unsigned int num_gh, struct gfs2_holder *ghs)
1634{
1635 struct gfs2_holder *tmp[4];
1636 struct gfs2_holder **pph = tmp;
1637 int error = 0;
1638
1639 switch(num_gh) {
1640 case 0:
1641 return 0;
1642 case 1:
1643 ghs->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC);
1644 return gfs2_glock_nq(ghs);
1645 default:
1646 if (num_gh <= 4)
1647 break;
1648 pph = kmalloc_array(num_gh, sizeof(struct gfs2_holder *),
1649 GFP_NOFS);
1650 if (!pph)
1651 return -ENOMEM;
1652 }
1653
1654 error = nq_m_sync(num_gh, ghs, pph);
1655
1656 if (pph != tmp)
1657 kfree(pph);
1658
1659 return error;
1660}
1661
1662
1663
1664
1665
1666
1667
1668
1669void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs)
1670{
1671 while (num_gh--)
1672 gfs2_glock_dq(&ghs[num_gh]);
1673}
1674
1675void gfs2_glock_cb(struct gfs2_glock *gl, unsigned int state)
1676{
1677 unsigned long delay = 0;
1678 unsigned long holdtime;
1679 unsigned long now = jiffies;
1680
1681 gfs2_glock_hold(gl);
1682 spin_lock(&gl->gl_lockref.lock);
1683 holdtime = gl->gl_tchange + gl->gl_hold_time;
1684 if (!list_empty(&gl->gl_holders) &&
1685 gl->gl_name.ln_type == LM_TYPE_INODE) {
1686 if (time_before(now, holdtime))
1687 delay = holdtime - now;
1688 if (test_bit(GLF_REPLY_PENDING, &gl->gl_flags))
1689 delay = gl->gl_hold_time;
1690 }
1691 handle_callback(gl, state, delay, true);
1692 __gfs2_glock_queue_work(gl, delay);
1693 spin_unlock(&gl->gl_lockref.lock);
1694}
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707static int gfs2_should_freeze(const struct gfs2_glock *gl)
1708{
1709 const struct gfs2_holder *gh;
1710
1711 if (gl->gl_reply & ~LM_OUT_ST_MASK)
1712 return 0;
1713 if (gl->gl_target == LM_ST_UNLOCKED)
1714 return 0;
1715
1716 list_for_each_entry(gh, &gl->gl_holders, gh_list) {
1717 if (test_bit(HIF_HOLDER, &gh->gh_iflags))
1718 continue;
1719 if (LM_FLAG_NOEXP & gh->gh_flags)
1720 return 0;
1721 }
1722
1723 return 1;
1724}
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735void gfs2_glock_complete(struct gfs2_glock *gl, int ret)
1736{
1737 struct lm_lockstruct *ls = &gl->gl_name.ln_sbd->sd_lockstruct;
1738
1739 spin_lock(&gl->gl_lockref.lock);
1740 gl->gl_reply = ret;
1741
1742 if (unlikely(test_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags))) {
1743 if (gfs2_should_freeze(gl)) {
1744 set_bit(GLF_FROZEN, &gl->gl_flags);
1745 spin_unlock(&gl->gl_lockref.lock);
1746 return;
1747 }
1748 }
1749
1750 gl->gl_lockref.count++;
1751 set_bit(GLF_REPLY_PENDING, &gl->gl_flags);
1752 __gfs2_glock_queue_work(gl, 0);
1753 spin_unlock(&gl->gl_lockref.lock);
1754}
1755
1756static int glock_cmp(void *priv, const struct list_head *a,
1757 const struct list_head *b)
1758{
1759 struct gfs2_glock *gla, *glb;
1760
1761 gla = list_entry(a, struct gfs2_glock, gl_lru);
1762 glb = list_entry(b, struct gfs2_glock, gl_lru);
1763
1764 if (gla->gl_name.ln_number > glb->gl_name.ln_number)
1765 return 1;
1766 if (gla->gl_name.ln_number < glb->gl_name.ln_number)
1767 return -1;
1768
1769 return 0;
1770}
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786static void gfs2_dispose_glock_lru(struct list_head *list)
1787__releases(&lru_lock)
1788__acquires(&lru_lock)
1789{
1790 struct gfs2_glock *gl;
1791
1792 list_sort(NULL, list, glock_cmp);
1793
1794 while(!list_empty(list)) {
1795 gl = list_first_entry(list, struct gfs2_glock, gl_lru);
1796 list_del_init(&gl->gl_lru);
1797 clear_bit(GLF_LRU, &gl->gl_flags);
1798 if (!spin_trylock(&gl->gl_lockref.lock)) {
1799add_back_to_lru:
1800 list_add(&gl->gl_lru, &lru_list);
1801 set_bit(GLF_LRU, &gl->gl_flags);
1802 atomic_inc(&lru_count);
1803 continue;
1804 }
1805 if (test_and_set_bit(GLF_LOCK, &gl->gl_flags)) {
1806 spin_unlock(&gl->gl_lockref.lock);
1807 goto add_back_to_lru;
1808 }
1809 gl->gl_lockref.count++;
1810 if (demote_ok(gl))
1811 handle_callback(gl, LM_ST_UNLOCKED, 0, false);
1812 WARN_ON(!test_and_clear_bit(GLF_LOCK, &gl->gl_flags));
1813 __gfs2_glock_queue_work(gl, 0);
1814 spin_unlock(&gl->gl_lockref.lock);
1815 cond_resched_lock(&lru_lock);
1816 }
1817}
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828static long gfs2_scan_glock_lru(int nr)
1829{
1830 struct gfs2_glock *gl;
1831 LIST_HEAD(skipped);
1832 LIST_HEAD(dispose);
1833 long freed = 0;
1834
1835 spin_lock(&lru_lock);
1836 while ((nr-- >= 0) && !list_empty(&lru_list)) {
1837 gl = list_first_entry(&lru_list, struct gfs2_glock, gl_lru);
1838
1839
1840 if (!test_bit(GLF_LOCK, &gl->gl_flags)) {
1841 list_move(&gl->gl_lru, &dispose);
1842 atomic_dec(&lru_count);
1843 freed++;
1844 continue;
1845 }
1846
1847 list_move(&gl->gl_lru, &skipped);
1848 }
1849 list_splice(&skipped, &lru_list);
1850 if (!list_empty(&dispose))
1851 gfs2_dispose_glock_lru(&dispose);
1852 spin_unlock(&lru_lock);
1853
1854 return freed;
1855}
1856
1857static unsigned long gfs2_glock_shrink_scan(struct shrinker *shrink,
1858 struct shrink_control *sc)
1859{
1860 if (!(sc->gfp_mask & __GFP_FS))
1861 return SHRINK_STOP;
1862 return gfs2_scan_glock_lru(sc->nr_to_scan);
1863}
1864
1865static unsigned long gfs2_glock_shrink_count(struct shrinker *shrink,
1866 struct shrink_control *sc)
1867{
1868 return vfs_pressure_ratio(atomic_read(&lru_count));
1869}
1870
1871static struct shrinker glock_shrinker = {
1872 .seeks = DEFAULT_SEEKS,
1873 .count_objects = gfs2_glock_shrink_count,
1874 .scan_objects = gfs2_glock_shrink_scan,
1875};
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887static void glock_hash_walk(glock_examiner examiner, const struct gfs2_sbd *sdp)
1888{
1889 struct gfs2_glock *gl;
1890 struct rhashtable_iter iter;
1891
1892 rhashtable_walk_enter(&gl_hash_table, &iter);
1893
1894 do {
1895 rhashtable_walk_start(&iter);
1896
1897 while ((gl = rhashtable_walk_next(&iter)) && !IS_ERR(gl))
1898 if (gl->gl_name.ln_sbd == sdp &&
1899 lockref_get_not_dead(&gl->gl_lockref))
1900 examiner(gl);
1901
1902 rhashtable_walk_stop(&iter);
1903 } while (cond_resched(), gl == ERR_PTR(-EAGAIN));
1904
1905 rhashtable_walk_exit(&iter);
1906}
1907
1908bool gfs2_queue_delete_work(struct gfs2_glock *gl, unsigned long delay)
1909{
1910 bool queued;
1911
1912 spin_lock(&gl->gl_lockref.lock);
1913 queued = queue_delayed_work(gfs2_delete_workqueue,
1914 &gl->gl_delete, delay);
1915 if (queued)
1916 set_bit(GLF_PENDING_DELETE, &gl->gl_flags);
1917 spin_unlock(&gl->gl_lockref.lock);
1918 return queued;
1919}
1920
1921void gfs2_cancel_delete_work(struct gfs2_glock *gl)
1922{
1923 if (cancel_delayed_work_sync(&gl->gl_delete)) {
1924 clear_bit(GLF_PENDING_DELETE, &gl->gl_flags);
1925 gfs2_glock_put(gl);
1926 }
1927}
1928
1929bool gfs2_delete_work_queued(const struct gfs2_glock *gl)
1930{
1931 return test_bit(GLF_PENDING_DELETE, &gl->gl_flags);
1932}
1933
1934static void flush_delete_work(struct gfs2_glock *gl)
1935{
1936 if (gl->gl_name.ln_type == LM_TYPE_IOPEN) {
1937 if (cancel_delayed_work(&gl->gl_delete)) {
1938 queue_delayed_work(gfs2_delete_workqueue,
1939 &gl->gl_delete, 0);
1940 }
1941 }
1942 gfs2_glock_queue_work(gl, 0);
1943}
1944
1945void gfs2_flush_delete_work(struct gfs2_sbd *sdp)
1946{
1947 glock_hash_walk(flush_delete_work, sdp);
1948 flush_workqueue(gfs2_delete_workqueue);
1949}
1950
1951
1952
1953
1954
1955
1956
1957static void thaw_glock(struct gfs2_glock *gl)
1958{
1959 if (!test_and_clear_bit(GLF_FROZEN, &gl->gl_flags)) {
1960 gfs2_glock_put(gl);
1961 return;
1962 }
1963 set_bit(GLF_REPLY_PENDING, &gl->gl_flags);
1964 gfs2_glock_queue_work(gl, 0);
1965}
1966
1967
1968
1969
1970
1971
1972
1973static void clear_glock(struct gfs2_glock *gl)
1974{
1975 gfs2_glock_remove_from_lru(gl);
1976
1977 spin_lock(&gl->gl_lockref.lock);
1978 if (gl->gl_state != LM_ST_UNLOCKED)
1979 handle_callback(gl, LM_ST_UNLOCKED, 0, false);
1980 __gfs2_glock_queue_work(gl, 0);
1981 spin_unlock(&gl->gl_lockref.lock);
1982}
1983
1984
1985
1986
1987
1988
1989
1990void gfs2_glock_thaw(struct gfs2_sbd *sdp)
1991{
1992 glock_hash_walk(thaw_glock, sdp);
1993}
1994
1995static void dump_glock(struct seq_file *seq, struct gfs2_glock *gl, bool fsid)
1996{
1997 spin_lock(&gl->gl_lockref.lock);
1998 gfs2_dump_glock(seq, gl, fsid);
1999 spin_unlock(&gl->gl_lockref.lock);
2000}
2001
2002static void dump_glock_func(struct gfs2_glock *gl)
2003{
2004 dump_glock(NULL, gl, true);
2005}
2006
2007
2008
2009
2010
2011
2012
2013
2014void gfs2_gl_hash_clear(struct gfs2_sbd *sdp)
2015{
2016 set_bit(SDF_SKIP_DLM_UNLOCK, &sdp->sd_flags);
2017 flush_workqueue(glock_workqueue);
2018 glock_hash_walk(clear_glock, sdp);
2019 flush_workqueue(glock_workqueue);
2020 wait_event_timeout(sdp->sd_glock_wait,
2021 atomic_read(&sdp->sd_glock_disposal) == 0,
2022 HZ * 600);
2023 glock_hash_walk(dump_glock_func, sdp);
2024}
2025
2026void gfs2_glock_finish_truncate(struct gfs2_inode *ip)
2027{
2028 struct gfs2_glock *gl = ip->i_gl;
2029 int ret;
2030
2031 ret = gfs2_truncatei_resume(ip);
2032 gfs2_glock_assert_withdraw(gl, ret == 0);
2033
2034 spin_lock(&gl->gl_lockref.lock);
2035 clear_bit(GLF_LOCK, &gl->gl_flags);
2036 run_queue(gl, 1);
2037 spin_unlock(&gl->gl_lockref.lock);
2038}
2039
2040static const char *state2str(unsigned state)
2041{
2042 switch(state) {
2043 case LM_ST_UNLOCKED:
2044 return "UN";
2045 case LM_ST_SHARED:
2046 return "SH";
2047 case LM_ST_DEFERRED:
2048 return "DF";
2049 case LM_ST_EXCLUSIVE:
2050 return "EX";
2051 }
2052 return "??";
2053}
2054
2055static const char *hflags2str(char *buf, u16 flags, unsigned long iflags)
2056{
2057 char *p = buf;
2058 if (flags & LM_FLAG_TRY)
2059 *p++ = 't';
2060 if (flags & LM_FLAG_TRY_1CB)
2061 *p++ = 'T';
2062 if (flags & LM_FLAG_NOEXP)
2063 *p++ = 'e';
2064 if (flags & LM_FLAG_ANY)
2065 *p++ = 'A';
2066 if (flags & LM_FLAG_PRIORITY)
2067 *p++ = 'p';
2068 if (flags & LM_FLAG_NODE_SCOPE)
2069 *p++ = 'n';
2070 if (flags & GL_ASYNC)
2071 *p++ = 'a';
2072 if (flags & GL_EXACT)
2073 *p++ = 'E';
2074 if (flags & GL_NOCACHE)
2075 *p++ = 'c';
2076 if (test_bit(HIF_HOLDER, &iflags))
2077 *p++ = 'H';
2078 if (test_bit(HIF_WAIT, &iflags))
2079 *p++ = 'W';
2080 if (test_bit(HIF_FIRST, &iflags))
2081 *p++ = 'F';
2082 *p = 0;
2083 return buf;
2084}
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094static void dump_holder(struct seq_file *seq, const struct gfs2_holder *gh,
2095 const char *fs_id_buf)
2096{
2097 struct task_struct *gh_owner = NULL;
2098 char flags_buf[32];
2099
2100 rcu_read_lock();
2101 if (gh->gh_owner_pid)
2102 gh_owner = pid_task(gh->gh_owner_pid, PIDTYPE_PID);
2103 gfs2_print_dbg(seq, "%s H: s:%s f:%s e:%d p:%ld [%s] %pS\n",
2104 fs_id_buf, state2str(gh->gh_state),
2105 hflags2str(flags_buf, gh->gh_flags, gh->gh_iflags),
2106 gh->gh_error,
2107 gh->gh_owner_pid ? (long)pid_nr(gh->gh_owner_pid) : -1,
2108 gh_owner ? gh_owner->comm : "(ended)",
2109 (void *)gh->gh_ip);
2110 rcu_read_unlock();
2111}
2112
2113static const char *gflags2str(char *buf, const struct gfs2_glock *gl)
2114{
2115 const unsigned long *gflags = &gl->gl_flags;
2116 char *p = buf;
2117
2118 if (test_bit(GLF_LOCK, gflags))
2119 *p++ = 'l';
2120 if (test_bit(GLF_DEMOTE, gflags))
2121 *p++ = 'D';
2122 if (test_bit(GLF_PENDING_DEMOTE, gflags))
2123 *p++ = 'd';
2124 if (test_bit(GLF_DEMOTE_IN_PROGRESS, gflags))
2125 *p++ = 'p';
2126 if (test_bit(GLF_DIRTY, gflags))
2127 *p++ = 'y';
2128 if (test_bit(GLF_LFLUSH, gflags))
2129 *p++ = 'f';
2130 if (test_bit(GLF_INVALIDATE_IN_PROGRESS, gflags))
2131 *p++ = 'i';
2132 if (test_bit(GLF_REPLY_PENDING, gflags))
2133 *p++ = 'r';
2134 if (test_bit(GLF_INITIAL, gflags))
2135 *p++ = 'I';
2136 if (test_bit(GLF_FROZEN, gflags))
2137 *p++ = 'F';
2138 if (!list_empty(&gl->gl_holders))
2139 *p++ = 'q';
2140 if (test_bit(GLF_LRU, gflags))
2141 *p++ = 'L';
2142 if (gl->gl_object)
2143 *p++ = 'o';
2144 if (test_bit(GLF_BLOCKING, gflags))
2145 *p++ = 'b';
2146 if (test_bit(GLF_PENDING_DELETE, gflags))
2147 *p++ = 'P';
2148 if (test_bit(GLF_FREEING, gflags))
2149 *p++ = 'x';
2150 *p = 0;
2151 return buf;
2152}
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172void gfs2_dump_glock(struct seq_file *seq, struct gfs2_glock *gl, bool fsid)
2173{
2174 const struct gfs2_glock_operations *glops = gl->gl_ops;
2175 unsigned long long dtime;
2176 const struct gfs2_holder *gh;
2177 char gflags_buf[32];
2178 struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
2179 char fs_id_buf[sizeof(sdp->sd_fsname) + 7];
2180 unsigned long nrpages = 0;
2181
2182 if (gl->gl_ops->go_flags & GLOF_ASPACE) {
2183 struct address_space *mapping = gfs2_glock2aspace(gl);
2184
2185 nrpages = mapping->nrpages;
2186 }
2187 memset(fs_id_buf, 0, sizeof(fs_id_buf));
2188 if (fsid && sdp)
2189 sprintf(fs_id_buf, "fsid=%s: ", sdp->sd_fsname);
2190 dtime = jiffies - gl->gl_demote_time;
2191 dtime *= 1000000/HZ;
2192 if (!test_bit(GLF_DEMOTE, &gl->gl_flags))
2193 dtime = 0;
2194 gfs2_print_dbg(seq, "%sG: s:%s n:%u/%llx f:%s t:%s d:%s/%llu a:%d "
2195 "v:%d r:%d m:%ld p:%lu\n",
2196 fs_id_buf, state2str(gl->gl_state),
2197 gl->gl_name.ln_type,
2198 (unsigned long long)gl->gl_name.ln_number,
2199 gflags2str(gflags_buf, gl),
2200 state2str(gl->gl_target),
2201 state2str(gl->gl_demote_state), dtime,
2202 atomic_read(&gl->gl_ail_count),
2203 atomic_read(&gl->gl_revokes),
2204 (int)gl->gl_lockref.count, gl->gl_hold_time, nrpages);
2205
2206 list_for_each_entry(gh, &gl->gl_holders, gh_list)
2207 dump_holder(seq, gh, fs_id_buf);
2208
2209 if (gl->gl_state != LM_ST_UNLOCKED && glops->go_dump)
2210 glops->go_dump(seq, gl, fs_id_buf);
2211}
2212
2213static int gfs2_glstats_seq_show(struct seq_file *seq, void *iter_ptr)
2214{
2215 struct gfs2_glock *gl = iter_ptr;
2216
2217 seq_printf(seq, "G: n:%u/%llx rtt:%llu/%llu rttb:%llu/%llu irt:%llu/%llu dcnt: %llu qcnt: %llu\n",
2218 gl->gl_name.ln_type,
2219 (unsigned long long)gl->gl_name.ln_number,
2220 (unsigned long long)gl->gl_stats.stats[GFS2_LKS_SRTT],
2221 (unsigned long long)gl->gl_stats.stats[GFS2_LKS_SRTTVAR],
2222 (unsigned long long)gl->gl_stats.stats[GFS2_LKS_SRTTB],
2223 (unsigned long long)gl->gl_stats.stats[GFS2_LKS_SRTTVARB],
2224 (unsigned long long)gl->gl_stats.stats[GFS2_LKS_SIRT],
2225 (unsigned long long)gl->gl_stats.stats[GFS2_LKS_SIRTVAR],
2226 (unsigned long long)gl->gl_stats.stats[GFS2_LKS_DCOUNT],
2227 (unsigned long long)gl->gl_stats.stats[GFS2_LKS_QCOUNT]);
2228 return 0;
2229}
2230
2231static const char *gfs2_gltype[] = {
2232 "type",
2233 "reserved",
2234 "nondisk",
2235 "inode",
2236 "rgrp",
2237 "meta",
2238 "iopen",
2239 "flock",
2240 "plock",
2241 "quota",
2242 "journal",
2243};
2244
2245static const char *gfs2_stype[] = {
2246 [GFS2_LKS_SRTT] = "srtt",
2247 [GFS2_LKS_SRTTVAR] = "srttvar",
2248 [GFS2_LKS_SRTTB] = "srttb",
2249 [GFS2_LKS_SRTTVARB] = "srttvarb",
2250 [GFS2_LKS_SIRT] = "sirt",
2251 [GFS2_LKS_SIRTVAR] = "sirtvar",
2252 [GFS2_LKS_DCOUNT] = "dlm",
2253 [GFS2_LKS_QCOUNT] = "queue",
2254};
2255
2256#define GFS2_NR_SBSTATS (ARRAY_SIZE(gfs2_gltype) * ARRAY_SIZE(gfs2_stype))
2257
2258static int gfs2_sbstats_seq_show(struct seq_file *seq, void *iter_ptr)
2259{
2260 struct gfs2_sbd *sdp = seq->private;
2261 loff_t pos = *(loff_t *)iter_ptr;
2262 unsigned index = pos >> 3;
2263 unsigned subindex = pos & 0x07;
2264 int i;
2265
2266 if (index == 0 && subindex != 0)
2267 return 0;
2268
2269 seq_printf(seq, "%-10s %8s:", gfs2_gltype[index],
2270 (index == 0) ? "cpu": gfs2_stype[subindex]);
2271
2272 for_each_possible_cpu(i) {
2273 const struct gfs2_pcpu_lkstats *lkstats = per_cpu_ptr(sdp->sd_lkstats, i);
2274
2275 if (index == 0)
2276 seq_printf(seq, " %15u", i);
2277 else
2278 seq_printf(seq, " %15llu", (unsigned long long)lkstats->
2279 lkstats[index - 1].stats[subindex]);
2280 }
2281 seq_putc(seq, '\n');
2282 return 0;
2283}
2284
2285int __init gfs2_glock_init(void)
2286{
2287 int i, ret;
2288
2289 ret = rhashtable_init(&gl_hash_table, &ht_parms);
2290 if (ret < 0)
2291 return ret;
2292
2293 glock_workqueue = alloc_workqueue("glock_workqueue", WQ_MEM_RECLAIM |
2294 WQ_HIGHPRI | WQ_FREEZABLE, 0);
2295 if (!glock_workqueue) {
2296 rhashtable_destroy(&gl_hash_table);
2297 return -ENOMEM;
2298 }
2299 gfs2_delete_workqueue = alloc_workqueue("delete_workqueue",
2300 WQ_MEM_RECLAIM | WQ_FREEZABLE,
2301 0);
2302 if (!gfs2_delete_workqueue) {
2303 destroy_workqueue(glock_workqueue);
2304 rhashtable_destroy(&gl_hash_table);
2305 return -ENOMEM;
2306 }
2307
2308 ret = register_shrinker(&glock_shrinker);
2309 if (ret) {
2310 destroy_workqueue(gfs2_delete_workqueue);
2311 destroy_workqueue(glock_workqueue);
2312 rhashtable_destroy(&gl_hash_table);
2313 return ret;
2314 }
2315
2316 for (i = 0; i < GLOCK_WAIT_TABLE_SIZE; i++)
2317 init_waitqueue_head(glock_wait_table + i);
2318
2319 return 0;
2320}
2321
2322void gfs2_glock_exit(void)
2323{
2324 unregister_shrinker(&glock_shrinker);
2325 rhashtable_destroy(&gl_hash_table);
2326 destroy_workqueue(glock_workqueue);
2327 destroy_workqueue(gfs2_delete_workqueue);
2328}
2329
2330static void gfs2_glock_iter_next(struct gfs2_glock_iter *gi, loff_t n)
2331{
2332 struct gfs2_glock *gl = gi->gl;
2333
2334 if (gl) {
2335 if (n == 0)
2336 return;
2337 if (!lockref_put_not_zero(&gl->gl_lockref))
2338 gfs2_glock_queue_put(gl);
2339 }
2340 for (;;) {
2341 gl = rhashtable_walk_next(&gi->hti);
2342 if (IS_ERR_OR_NULL(gl)) {
2343 if (gl == ERR_PTR(-EAGAIN)) {
2344 n = 1;
2345 continue;
2346 }
2347 gl = NULL;
2348 break;
2349 }
2350 if (gl->gl_name.ln_sbd != gi->sdp)
2351 continue;
2352 if (n <= 1) {
2353 if (!lockref_get_not_dead(&gl->gl_lockref))
2354 continue;
2355 break;
2356 } else {
2357 if (__lockref_is_dead(&gl->gl_lockref))
2358 continue;
2359 n--;
2360 }
2361 }
2362 gi->gl = gl;
2363}
2364
2365static void *gfs2_glock_seq_start(struct seq_file *seq, loff_t *pos)
2366 __acquires(RCU)
2367{
2368 struct gfs2_glock_iter *gi = seq->private;
2369 loff_t n;
2370
2371
2372
2373
2374
2375 if (*pos < gi->last_pos) {
2376 rhashtable_walk_exit(&gi->hti);
2377 rhashtable_walk_enter(&gl_hash_table, &gi->hti);
2378 n = *pos + 1;
2379 } else {
2380 n = *pos - gi->last_pos;
2381 }
2382
2383 rhashtable_walk_start(&gi->hti);
2384
2385 gfs2_glock_iter_next(gi, n);
2386 gi->last_pos = *pos;
2387 return gi->gl;
2388}
2389
2390static void *gfs2_glock_seq_next(struct seq_file *seq, void *iter_ptr,
2391 loff_t *pos)
2392{
2393 struct gfs2_glock_iter *gi = seq->private;
2394
2395 (*pos)++;
2396 gi->last_pos = *pos;
2397 gfs2_glock_iter_next(gi, 1);
2398 return gi->gl;
2399}
2400
2401static void gfs2_glock_seq_stop(struct seq_file *seq, void *iter_ptr)
2402 __releases(RCU)
2403{
2404 struct gfs2_glock_iter *gi = seq->private;
2405
2406 rhashtable_walk_stop(&gi->hti);
2407}
2408
2409static int gfs2_glock_seq_show(struct seq_file *seq, void *iter_ptr)
2410{
2411 dump_glock(seq, iter_ptr, false);
2412 return 0;
2413}
2414
2415static void *gfs2_sbstats_seq_start(struct seq_file *seq, loff_t *pos)
2416{
2417 preempt_disable();
2418 if (*pos >= GFS2_NR_SBSTATS)
2419 return NULL;
2420 return pos;
2421}
2422
2423static void *gfs2_sbstats_seq_next(struct seq_file *seq, void *iter_ptr,
2424 loff_t *pos)
2425{
2426 (*pos)++;
2427 if (*pos >= GFS2_NR_SBSTATS)
2428 return NULL;
2429 return pos;
2430}
2431
2432static void gfs2_sbstats_seq_stop(struct seq_file *seq, void *iter_ptr)
2433{
2434 preempt_enable();
2435}
2436
2437static const struct seq_operations gfs2_glock_seq_ops = {
2438 .start = gfs2_glock_seq_start,
2439 .next = gfs2_glock_seq_next,
2440 .stop = gfs2_glock_seq_stop,
2441 .show = gfs2_glock_seq_show,
2442};
2443
2444static const struct seq_operations gfs2_glstats_seq_ops = {
2445 .start = gfs2_glock_seq_start,
2446 .next = gfs2_glock_seq_next,
2447 .stop = gfs2_glock_seq_stop,
2448 .show = gfs2_glstats_seq_show,
2449};
2450
2451static const struct seq_operations gfs2_sbstats_sops = {
2452 .start = gfs2_sbstats_seq_start,
2453 .next = gfs2_sbstats_seq_next,
2454 .stop = gfs2_sbstats_seq_stop,
2455 .show = gfs2_sbstats_seq_show,
2456};
2457
2458#define GFS2_SEQ_GOODSIZE min(PAGE_SIZE << PAGE_ALLOC_COSTLY_ORDER, 65536UL)
2459
2460static int __gfs2_glocks_open(struct inode *inode, struct file *file,
2461 const struct seq_operations *ops)
2462{
2463 int ret = seq_open_private(file, ops, sizeof(struct gfs2_glock_iter));
2464 if (ret == 0) {
2465 struct seq_file *seq = file->private_data;
2466 struct gfs2_glock_iter *gi = seq->private;
2467
2468 gi->sdp = inode->i_private;
2469 seq->buf = kmalloc(GFS2_SEQ_GOODSIZE, GFP_KERNEL | __GFP_NOWARN);
2470 if (seq->buf)
2471 seq->size = GFS2_SEQ_GOODSIZE;
2472
2473
2474
2475
2476 gi->last_pos = -1;
2477 gi->gl = NULL;
2478 rhashtable_walk_enter(&gl_hash_table, &gi->hti);
2479 }
2480 return ret;
2481}
2482
2483static int gfs2_glocks_open(struct inode *inode, struct file *file)
2484{
2485 return __gfs2_glocks_open(inode, file, &gfs2_glock_seq_ops);
2486}
2487
2488static int gfs2_glocks_release(struct inode *inode, struct file *file)
2489{
2490 struct seq_file *seq = file->private_data;
2491 struct gfs2_glock_iter *gi = seq->private;
2492
2493 if (gi->gl)
2494 gfs2_glock_put(gi->gl);
2495 rhashtable_walk_exit(&gi->hti);
2496 return seq_release_private(inode, file);
2497}
2498
2499static int gfs2_glstats_open(struct inode *inode, struct file *file)
2500{
2501 return __gfs2_glocks_open(inode, file, &gfs2_glstats_seq_ops);
2502}
2503
2504static const struct file_operations gfs2_glocks_fops = {
2505 .owner = THIS_MODULE,
2506 .open = gfs2_glocks_open,
2507 .read = seq_read,
2508 .llseek = seq_lseek,
2509 .release = gfs2_glocks_release,
2510};
2511
2512static const struct file_operations gfs2_glstats_fops = {
2513 .owner = THIS_MODULE,
2514 .open = gfs2_glstats_open,
2515 .read = seq_read,
2516 .llseek = seq_lseek,
2517 .release = gfs2_glocks_release,
2518};
2519
2520DEFINE_SEQ_ATTRIBUTE(gfs2_sbstats);
2521
2522void gfs2_create_debugfs_file(struct gfs2_sbd *sdp)
2523{
2524 sdp->debugfs_dir = debugfs_create_dir(sdp->sd_table_name, gfs2_root);
2525
2526 debugfs_create_file("glocks", S_IFREG | S_IRUGO, sdp->debugfs_dir, sdp,
2527 &gfs2_glocks_fops);
2528
2529 debugfs_create_file("glstats", S_IFREG | S_IRUGO, sdp->debugfs_dir, sdp,
2530 &gfs2_glstats_fops);
2531
2532 debugfs_create_file("sbstats", S_IFREG | S_IRUGO, sdp->debugfs_dir, sdp,
2533 &gfs2_sbstats_fops);
2534}
2535
2536void gfs2_delete_debugfs_file(struct gfs2_sbd *sdp)
2537{
2538 debugfs_remove_recursive(sdp->debugfs_dir);
2539 sdp->debugfs_dir = NULL;
2540}
2541
2542void gfs2_register_debugfs(void)
2543{
2544 gfs2_root = debugfs_create_dir("gfs2", NULL);
2545}
2546
2547void gfs2_unregister_debugfs(void)
2548{
2549 debugfs_remove(gfs2_root);
2550 gfs2_root = NULL;
2551}
2552