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10#include <linux/sched.h>
11#include <linux/slab.h>
12#include <linux/spinlock.h>
13#include <linux/completion.h>
14#include <linux/buffer_head.h>
15#include <linux/gfs2_ondisk.h>
16#include <linux/crc32.h>
17#include <linux/delay.h>
18#include <linux/kthread.h>
19#include <linux/freezer.h>
20#include <linux/bio.h>
21#include <linux/writeback.h>
22#include <linux/list_sort.h>
23
24#include "gfs2.h"
25#include "incore.h"
26#include "bmap.h"
27#include "glock.h"
28#include "log.h"
29#include "lops.h"
30#include "meta_io.h"
31#include "util.h"
32#include "dir.h"
33#include "trace_gfs2.h"
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44
45
46
47unsigned int gfs2_struct2blk(struct gfs2_sbd *sdp, unsigned int nstruct,
48 unsigned int ssize)
49{
50 unsigned int blks;
51 unsigned int first, second;
52
53 blks = 1;
54 first = (sdp->sd_sb.sb_bsize - sizeof(struct gfs2_log_descriptor)) / ssize;
55
56 if (nstruct > first) {
57 second = (sdp->sd_sb.sb_bsize -
58 sizeof(struct gfs2_meta_header)) / ssize;
59 blks += DIV_ROUND_UP(nstruct - first, second);
60 }
61
62 return blks;
63}
64
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72
73
74void gfs2_remove_from_ail(struct gfs2_bufdata *bd)
75{
76 bd->bd_tr = NULL;
77 list_del_init(&bd->bd_ail_st_list);
78 list_del_init(&bd->bd_ail_gl_list);
79 atomic_dec(&bd->bd_gl->gl_ail_count);
80 brelse(bd->bd_bh);
81}
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90
91static int gfs2_ail1_start_one(struct gfs2_sbd *sdp,
92 struct writeback_control *wbc,
93 struct gfs2_trans *tr)
94__releases(&sdp->sd_ail_lock)
95__acquires(&sdp->sd_ail_lock)
96{
97 struct gfs2_glock *gl = NULL;
98 struct address_space *mapping;
99 struct gfs2_bufdata *bd, *s;
100 struct buffer_head *bh;
101
102 list_for_each_entry_safe_reverse(bd, s, &tr->tr_ail1_list, bd_ail_st_list) {
103 bh = bd->bd_bh;
104
105 gfs2_assert(sdp, bd->bd_tr == tr);
106
107 if (!buffer_busy(bh)) {
108 if (!buffer_uptodate(bh))
109 gfs2_io_error_bh(sdp, bh);
110 list_move(&bd->bd_ail_st_list, &tr->tr_ail2_list);
111 continue;
112 }
113
114 if (!buffer_dirty(bh))
115 continue;
116 if (gl == bd->bd_gl)
117 continue;
118 gl = bd->bd_gl;
119 list_move(&bd->bd_ail_st_list, &tr->tr_ail1_list);
120 mapping = bh->b_page->mapping;
121 if (!mapping)
122 continue;
123 spin_unlock(&sdp->sd_ail_lock);
124 generic_writepages(mapping, wbc);
125 spin_lock(&sdp->sd_ail_lock);
126 if (wbc->nr_to_write <= 0)
127 break;
128 return 1;
129 }
130
131 return 0;
132}
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143
144void gfs2_ail1_flush(struct gfs2_sbd *sdp, struct writeback_control *wbc)
145{
146 struct list_head *head = &sdp->sd_ail1_list;
147 struct gfs2_trans *tr;
148
149 trace_gfs2_ail_flush(sdp, wbc, 1);
150 spin_lock(&sdp->sd_ail_lock);
151restart:
152 list_for_each_entry_reverse(tr, head, tr_list) {
153 if (wbc->nr_to_write <= 0)
154 break;
155 if (gfs2_ail1_start_one(sdp, wbc, tr))
156 goto restart;
157 }
158 spin_unlock(&sdp->sd_ail_lock);
159 trace_gfs2_ail_flush(sdp, wbc, 0);
160}
161
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166
167static void gfs2_ail1_start(struct gfs2_sbd *sdp)
168{
169 struct writeback_control wbc = {
170 .sync_mode = WB_SYNC_NONE,
171 .nr_to_write = LONG_MAX,
172 .range_start = 0,
173 .range_end = LLONG_MAX,
174 };
175
176 return gfs2_ail1_flush(sdp, &wbc);
177}
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184
185
186static void gfs2_ail1_empty_one(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
187{
188 struct gfs2_bufdata *bd, *s;
189 struct buffer_head *bh;
190
191 list_for_each_entry_safe_reverse(bd, s, &tr->tr_ail1_list,
192 bd_ail_st_list) {
193 bh = bd->bd_bh;
194 gfs2_assert(sdp, bd->bd_tr == tr);
195 if (buffer_busy(bh))
196 continue;
197 if (!buffer_uptodate(bh))
198 gfs2_io_error_bh(sdp, bh);
199 list_move(&bd->bd_ail_st_list, &tr->tr_ail2_list);
200 }
201
202}
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210
211static int gfs2_ail1_empty(struct gfs2_sbd *sdp)
212{
213 struct gfs2_trans *tr, *s;
214 int oldest_tr = 1;
215 int ret;
216
217 spin_lock(&sdp->sd_ail_lock);
218 list_for_each_entry_safe_reverse(tr, s, &sdp->sd_ail1_list, tr_list) {
219 gfs2_ail1_empty_one(sdp, tr);
220 if (list_empty(&tr->tr_ail1_list) && oldest_tr)
221 list_move(&tr->tr_list, &sdp->sd_ail2_list);
222 else
223 oldest_tr = 0;
224 }
225 ret = list_empty(&sdp->sd_ail1_list);
226 spin_unlock(&sdp->sd_ail_lock);
227
228 return ret;
229}
230
231static void gfs2_ail1_wait(struct gfs2_sbd *sdp)
232{
233 struct gfs2_trans *tr;
234 struct gfs2_bufdata *bd;
235 struct buffer_head *bh;
236
237 spin_lock(&sdp->sd_ail_lock);
238 list_for_each_entry_reverse(tr, &sdp->sd_ail1_list, tr_list) {
239 list_for_each_entry(bd, &tr->tr_ail1_list, bd_ail_st_list) {
240 bh = bd->bd_bh;
241 if (!buffer_locked(bh))
242 continue;
243 get_bh(bh);
244 spin_unlock(&sdp->sd_ail_lock);
245 wait_on_buffer(bh);
246 brelse(bh);
247 return;
248 }
249 }
250 spin_unlock(&sdp->sd_ail_lock);
251}
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258
259
260static void gfs2_ail2_empty_one(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
261{
262 struct list_head *head = &tr->tr_ail2_list;
263 struct gfs2_bufdata *bd;
264
265 while (!list_empty(head)) {
266 bd = list_entry(head->prev, struct gfs2_bufdata,
267 bd_ail_st_list);
268 gfs2_assert(sdp, bd->bd_tr == tr);
269 gfs2_remove_from_ail(bd);
270 }
271}
272
273static void ail2_empty(struct gfs2_sbd *sdp, unsigned int new_tail)
274{
275 struct gfs2_trans *tr, *safe;
276 unsigned int old_tail = sdp->sd_log_tail;
277 int wrap = (new_tail < old_tail);
278 int a, b, rm;
279
280 spin_lock(&sdp->sd_ail_lock);
281
282 list_for_each_entry_safe(tr, safe, &sdp->sd_ail2_list, tr_list) {
283 a = (old_tail <= tr->tr_first);
284 b = (tr->tr_first < new_tail);
285 rm = (wrap) ? (a || b) : (a && b);
286 if (!rm)
287 continue;
288
289 gfs2_ail2_empty_one(sdp, tr);
290 list_del(&tr->tr_list);
291 gfs2_assert_warn(sdp, list_empty(&tr->tr_ail1_list));
292 gfs2_assert_warn(sdp, list_empty(&tr->tr_ail2_list));
293 kfree(tr);
294 }
295
296 spin_unlock(&sdp->sd_ail_lock);
297}
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319int gfs2_log_reserve(struct gfs2_sbd *sdp, unsigned int blks)
320{
321 unsigned reserved_blks = 7 * (4096 / sdp->sd_vfs->s_blocksize);
322 unsigned wanted = blks + reserved_blks;
323 DEFINE_WAIT(wait);
324 int did_wait = 0;
325 unsigned int free_blocks;
326
327 if (gfs2_assert_warn(sdp, blks) ||
328 gfs2_assert_warn(sdp, blks <= sdp->sd_jdesc->jd_blocks))
329 return -EINVAL;
330retry:
331 free_blocks = atomic_read(&sdp->sd_log_blks_free);
332 if (unlikely(free_blocks <= wanted)) {
333 do {
334 prepare_to_wait_exclusive(&sdp->sd_log_waitq, &wait,
335 TASK_UNINTERRUPTIBLE);
336 wake_up(&sdp->sd_logd_waitq);
337 did_wait = 1;
338 if (atomic_read(&sdp->sd_log_blks_free) <= wanted)
339 io_schedule();
340 free_blocks = atomic_read(&sdp->sd_log_blks_free);
341 } while(free_blocks <= wanted);
342 finish_wait(&sdp->sd_log_waitq, &wait);
343 }
344 if (atomic_cmpxchg(&sdp->sd_log_blks_free, free_blocks,
345 free_blocks - blks) != free_blocks)
346 goto retry;
347 trace_gfs2_log_blocks(sdp, -blks);
348
349
350
351
352
353 if (unlikely(did_wait))
354 wake_up(&sdp->sd_log_waitq);
355
356 down_read(&sdp->sd_log_flush_lock);
357
358 return 0;
359}
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372
373static inline unsigned int log_distance(struct gfs2_sbd *sdp, unsigned int newer,
374 unsigned int older)
375{
376 int dist;
377
378 dist = newer - older;
379 if (dist < 0)
380 dist += sdp->sd_jdesc->jd_blocks;
381
382 return dist;
383}
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410static unsigned int calc_reserved(struct gfs2_sbd *sdp)
411{
412 unsigned int reserved = 0;
413 unsigned int mbuf_limit, metabufhdrs_needed;
414 unsigned int dbuf_limit, databufhdrs_needed;
415 unsigned int revokes = 0;
416
417 mbuf_limit = buf_limit(sdp);
418 metabufhdrs_needed = (sdp->sd_log_commited_buf +
419 (mbuf_limit - 1)) / mbuf_limit;
420 dbuf_limit = databuf_limit(sdp);
421 databufhdrs_needed = (sdp->sd_log_commited_databuf +
422 (dbuf_limit - 1)) / dbuf_limit;
423
424 if (sdp->sd_log_commited_revoke > 0)
425 revokes = gfs2_struct2blk(sdp, sdp->sd_log_commited_revoke,
426 sizeof(u64));
427
428 reserved = sdp->sd_log_commited_buf + metabufhdrs_needed +
429 sdp->sd_log_commited_databuf + databufhdrs_needed +
430 revokes;
431
432 if (reserved)
433 reserved++;
434 return reserved;
435}
436
437static unsigned int current_tail(struct gfs2_sbd *sdp)
438{
439 struct gfs2_trans *tr;
440 unsigned int tail;
441
442 spin_lock(&sdp->sd_ail_lock);
443
444 if (list_empty(&sdp->sd_ail1_list)) {
445 tail = sdp->sd_log_head;
446 } else {
447 tr = list_entry(sdp->sd_ail1_list.prev, struct gfs2_trans,
448 tr_list);
449 tail = tr->tr_first;
450 }
451
452 spin_unlock(&sdp->sd_ail_lock);
453
454 return tail;
455}
456
457static void log_pull_tail(struct gfs2_sbd *sdp, unsigned int new_tail)
458{
459 unsigned int dist = log_distance(sdp, new_tail, sdp->sd_log_tail);
460
461 ail2_empty(sdp, new_tail);
462
463 atomic_add(dist, &sdp->sd_log_blks_free);
464 trace_gfs2_log_blocks(sdp, dist);
465 gfs2_assert_withdraw(sdp, atomic_read(&sdp->sd_log_blks_free) <=
466 sdp->sd_jdesc->jd_blocks);
467
468 sdp->sd_log_tail = new_tail;
469}
470
471
472static void log_flush_wait(struct gfs2_sbd *sdp)
473{
474 DEFINE_WAIT(wait);
475
476 if (atomic_read(&sdp->sd_log_in_flight)) {
477 do {
478 prepare_to_wait(&sdp->sd_log_flush_wait, &wait,
479 TASK_UNINTERRUPTIBLE);
480 if (atomic_read(&sdp->sd_log_in_flight))
481 io_schedule();
482 } while(atomic_read(&sdp->sd_log_in_flight));
483 finish_wait(&sdp->sd_log_flush_wait, &wait);
484 }
485}
486
487static int ip_cmp(void *priv, struct list_head *a, struct list_head *b)
488{
489 struct gfs2_inode *ipa, *ipb;
490
491 ipa = list_entry(a, struct gfs2_inode, i_ordered);
492 ipb = list_entry(b, struct gfs2_inode, i_ordered);
493
494 if (ipa->i_no_addr < ipb->i_no_addr)
495 return -1;
496 if (ipa->i_no_addr > ipb->i_no_addr)
497 return 1;
498 return 0;
499}
500
501static void gfs2_ordered_write(struct gfs2_sbd *sdp)
502{
503 struct gfs2_inode *ip;
504 LIST_HEAD(written);
505
506 spin_lock(&sdp->sd_ordered_lock);
507 list_sort(NULL, &sdp->sd_log_le_ordered, &ip_cmp);
508 while (!list_empty(&sdp->sd_log_le_ordered)) {
509 ip = list_entry(sdp->sd_log_le_ordered.next, struct gfs2_inode, i_ordered);
510 list_move(&ip->i_ordered, &written);
511 if (ip->i_inode.i_mapping->nrpages == 0)
512 continue;
513 spin_unlock(&sdp->sd_ordered_lock);
514 filemap_fdatawrite(ip->i_inode.i_mapping);
515 spin_lock(&sdp->sd_ordered_lock);
516 }
517 list_splice(&written, &sdp->sd_log_le_ordered);
518 spin_unlock(&sdp->sd_ordered_lock);
519}
520
521static void gfs2_ordered_wait(struct gfs2_sbd *sdp)
522{
523 struct gfs2_inode *ip;
524
525 spin_lock(&sdp->sd_ordered_lock);
526 while (!list_empty(&sdp->sd_log_le_ordered)) {
527 ip = list_entry(sdp->sd_log_le_ordered.next, struct gfs2_inode, i_ordered);
528 list_del(&ip->i_ordered);
529 WARN_ON(!test_and_clear_bit(GIF_ORDERED, &ip->i_flags));
530 if (ip->i_inode.i_mapping->nrpages == 0)
531 continue;
532 spin_unlock(&sdp->sd_ordered_lock);
533 filemap_fdatawait(ip->i_inode.i_mapping);
534 spin_lock(&sdp->sd_ordered_lock);
535 }
536 spin_unlock(&sdp->sd_ordered_lock);
537}
538
539void gfs2_ordered_del_inode(struct gfs2_inode *ip)
540{
541 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
542
543 spin_lock(&sdp->sd_ordered_lock);
544 if (test_and_clear_bit(GIF_ORDERED, &ip->i_flags))
545 list_del(&ip->i_ordered);
546 spin_unlock(&sdp->sd_ordered_lock);
547}
548
549void gfs2_add_revoke(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd)
550{
551 struct buffer_head *bh = bd->bd_bh;
552 struct gfs2_glock *gl = bd->bd_gl;
553
554 gfs2_remove_from_ail(bd);
555 bd->bd_bh = NULL;
556 bh->b_private = NULL;
557 bd->bd_blkno = bh->b_blocknr;
558 bd->bd_ops = &gfs2_revoke_lops;
559 sdp->sd_log_num_revoke++;
560 atomic_inc(&gl->gl_revokes);
561 set_bit(GLF_LFLUSH, &gl->gl_flags);
562 list_add(&bd->bd_list, &sdp->sd_log_le_revoke);
563}
564
565void gfs2_write_revokes(struct gfs2_sbd *sdp)
566{
567 struct gfs2_trans *tr;
568 struct gfs2_bufdata *bd, *tmp;
569 int have_revokes = 0;
570 int max_revokes = (sdp->sd_sb.sb_bsize - sizeof(struct gfs2_log_descriptor)) / sizeof(u64);
571
572 gfs2_ail1_empty(sdp);
573 spin_lock(&sdp->sd_ail_lock);
574 list_for_each_entry(tr, &sdp->sd_ail1_list, tr_list) {
575 list_for_each_entry(bd, &tr->tr_ail2_list, bd_ail_st_list) {
576 if (list_empty(&bd->bd_list)) {
577 have_revokes = 1;
578 goto done;
579 }
580 }
581 }
582done:
583 spin_unlock(&sdp->sd_ail_lock);
584 if (have_revokes == 0)
585 return;
586 while (sdp->sd_log_num_revoke > max_revokes)
587 max_revokes += (sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header)) / sizeof(u64);
588 max_revokes -= sdp->sd_log_num_revoke;
589 if (!sdp->sd_log_num_revoke) {
590 atomic_dec(&sdp->sd_log_blks_free);
591
592
593 if (!sdp->sd_log_blks_reserved)
594 atomic_dec(&sdp->sd_log_blks_free);
595 }
596 gfs2_log_lock(sdp);
597 spin_lock(&sdp->sd_ail_lock);
598 list_for_each_entry(tr, &sdp->sd_ail1_list, tr_list) {
599 list_for_each_entry_safe(bd, tmp, &tr->tr_ail2_list, bd_ail_st_list) {
600 if (max_revokes == 0)
601 goto out_of_blocks;
602 if (!list_empty(&bd->bd_list))
603 continue;
604 gfs2_add_revoke(sdp, bd);
605 max_revokes--;
606 }
607 }
608out_of_blocks:
609 spin_unlock(&sdp->sd_ail_lock);
610 gfs2_log_unlock(sdp);
611
612 if (!sdp->sd_log_num_revoke) {
613 atomic_inc(&sdp->sd_log_blks_free);
614 if (!sdp->sd_log_blks_reserved)
615 atomic_inc(&sdp->sd_log_blks_free);
616 }
617}
618
619
620
621
622
623
624
625
626static void log_write_header(struct gfs2_sbd *sdp, u32 flags)
627{
628 struct gfs2_log_header *lh;
629 unsigned int tail;
630 u32 hash;
631 int rw = WRITE_FLUSH_FUA | REQ_META;
632 struct page *page = mempool_alloc(gfs2_page_pool, GFP_NOIO);
633 lh = page_address(page);
634 clear_page(lh);
635
636 tail = current_tail(sdp);
637
638 lh->lh_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
639 lh->lh_header.mh_type = cpu_to_be32(GFS2_METATYPE_LH);
640 lh->lh_header.__pad0 = cpu_to_be64(0);
641 lh->lh_header.mh_format = cpu_to_be32(GFS2_FORMAT_LH);
642 lh->lh_header.mh_jid = cpu_to_be32(sdp->sd_jdesc->jd_jid);
643 lh->lh_sequence = cpu_to_be64(sdp->sd_log_sequence++);
644 lh->lh_flags = cpu_to_be32(flags);
645 lh->lh_tail = cpu_to_be32(tail);
646 lh->lh_blkno = cpu_to_be32(sdp->sd_log_flush_head);
647 hash = gfs2_disk_hash(page_address(page), sizeof(struct gfs2_log_header));
648 lh->lh_hash = cpu_to_be32(hash);
649
650 if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags)) {
651 gfs2_ordered_wait(sdp);
652 log_flush_wait(sdp);
653 rw = WRITE_SYNC | REQ_META | REQ_PRIO;
654 }
655
656 sdp->sd_log_idle = (tail == sdp->sd_log_flush_head);
657 gfs2_log_write_page(sdp, page);
658 gfs2_log_flush_bio(sdp, rw);
659 log_flush_wait(sdp);
660
661 if (sdp->sd_log_tail != tail)
662 log_pull_tail(sdp, tail);
663}
664
665
666
667
668
669
670
671
672void gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl)
673{
674 struct gfs2_trans *tr;
675
676 down_write(&sdp->sd_log_flush_lock);
677
678
679 if (gl && !test_bit(GLF_LFLUSH, &gl->gl_flags)) {
680 up_write(&sdp->sd_log_flush_lock);
681 return;
682 }
683 trace_gfs2_log_flush(sdp, 1);
684
685 tr = sdp->sd_log_tr;
686 if (tr) {
687 sdp->sd_log_tr = NULL;
688 INIT_LIST_HEAD(&tr->tr_ail1_list);
689 INIT_LIST_HEAD(&tr->tr_ail2_list);
690 }
691
692 if (sdp->sd_log_num_buf != sdp->sd_log_commited_buf) {
693 printk(KERN_INFO "GFS2: log buf %u %u\n", sdp->sd_log_num_buf,
694 sdp->sd_log_commited_buf);
695 gfs2_assert_withdraw(sdp, 0);
696 }
697 if (sdp->sd_log_num_databuf != sdp->sd_log_commited_databuf) {
698 printk(KERN_INFO "GFS2: log databuf %u %u\n",
699 sdp->sd_log_num_databuf, sdp->sd_log_commited_databuf);
700 gfs2_assert_withdraw(sdp, 0);
701 }
702 gfs2_assert_withdraw(sdp,
703 sdp->sd_log_num_revoke == sdp->sd_log_commited_revoke);
704
705 sdp->sd_log_flush_head = sdp->sd_log_head;
706 sdp->sd_log_flush_wrapped = 0;
707 if (tr)
708 tr->tr_first = sdp->sd_log_flush_head;
709
710 gfs2_ordered_write(sdp);
711 lops_before_commit(sdp);
712 gfs2_log_flush_bio(sdp, WRITE);
713
714 if (sdp->sd_log_head != sdp->sd_log_flush_head) {
715 log_write_header(sdp, 0);
716 } else if (sdp->sd_log_tail != current_tail(sdp) && !sdp->sd_log_idle){
717 atomic_dec(&sdp->sd_log_blks_free);
718 trace_gfs2_log_blocks(sdp, -1);
719 log_write_header(sdp, 0);
720 }
721 lops_after_commit(sdp, tr);
722
723 gfs2_log_lock(sdp);
724 sdp->sd_log_head = sdp->sd_log_flush_head;
725 sdp->sd_log_blks_reserved = 0;
726 sdp->sd_log_commited_buf = 0;
727 sdp->sd_log_commited_databuf = 0;
728 sdp->sd_log_commited_revoke = 0;
729
730 spin_lock(&sdp->sd_ail_lock);
731 if (tr && !list_empty(&tr->tr_ail1_list)) {
732 list_add(&tr->tr_list, &sdp->sd_ail1_list);
733 tr = NULL;
734 }
735 spin_unlock(&sdp->sd_ail_lock);
736 gfs2_log_unlock(sdp);
737 trace_gfs2_log_flush(sdp, 0);
738 up_write(&sdp->sd_log_flush_lock);
739
740 kfree(tr);
741}
742
743static void log_refund(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
744{
745 unsigned int reserved;
746 unsigned int unused;
747
748 gfs2_log_lock(sdp);
749
750 sdp->sd_log_commited_buf += tr->tr_num_buf_new - tr->tr_num_buf_rm;
751 sdp->sd_log_commited_databuf += tr->tr_num_databuf_new -
752 tr->tr_num_databuf_rm;
753 gfs2_assert_withdraw(sdp, (((int)sdp->sd_log_commited_buf) >= 0) ||
754 (((int)sdp->sd_log_commited_databuf) >= 0));
755 sdp->sd_log_commited_revoke += tr->tr_num_revoke - tr->tr_num_revoke_rm;
756 reserved = calc_reserved(sdp);
757 gfs2_assert_withdraw(sdp, sdp->sd_log_blks_reserved + tr->tr_reserved >= reserved);
758 unused = sdp->sd_log_blks_reserved - reserved + tr->tr_reserved;
759 atomic_add(unused, &sdp->sd_log_blks_free);
760 trace_gfs2_log_blocks(sdp, unused);
761 gfs2_assert_withdraw(sdp, atomic_read(&sdp->sd_log_blks_free) <=
762 sdp->sd_jdesc->jd_blocks);
763 sdp->sd_log_blks_reserved = reserved;
764
765 if (sdp->sd_log_tr == NULL &&
766 (tr->tr_num_buf_new || tr->tr_num_databuf_new)) {
767 gfs2_assert_withdraw(sdp, tr->tr_t_gh.gh_gl);
768 sdp->sd_log_tr = tr;
769 tr->tr_attached = 1;
770 }
771 gfs2_log_unlock(sdp);
772}
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789void gfs2_log_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
790{
791 log_refund(sdp, tr);
792
793 if (atomic_read(&sdp->sd_log_pinned) > atomic_read(&sdp->sd_log_thresh1) ||
794 ((sdp->sd_jdesc->jd_blocks - atomic_read(&sdp->sd_log_blks_free)) >
795 atomic_read(&sdp->sd_log_thresh2)))
796 wake_up(&sdp->sd_logd_waitq);
797}
798
799
800
801
802
803
804
805void gfs2_log_shutdown(struct gfs2_sbd *sdp)
806{
807 down_write(&sdp->sd_log_flush_lock);
808
809 gfs2_assert_withdraw(sdp, !sdp->sd_log_blks_reserved);
810 gfs2_assert_withdraw(sdp, !sdp->sd_log_num_buf);
811 gfs2_assert_withdraw(sdp, !sdp->sd_log_num_revoke);
812 gfs2_assert_withdraw(sdp, !sdp->sd_log_num_rg);
813 gfs2_assert_withdraw(sdp, !sdp->sd_log_num_databuf);
814 gfs2_assert_withdraw(sdp, list_empty(&sdp->sd_ail1_list));
815
816 sdp->sd_log_flush_head = sdp->sd_log_head;
817 sdp->sd_log_flush_wrapped = 0;
818
819 log_write_header(sdp, GFS2_LOG_HEAD_UNMOUNT);
820
821 gfs2_assert_warn(sdp, atomic_read(&sdp->sd_log_blks_free) == sdp->sd_jdesc->jd_blocks);
822 gfs2_assert_warn(sdp, sdp->sd_log_head == sdp->sd_log_tail);
823 gfs2_assert_warn(sdp, list_empty(&sdp->sd_ail2_list));
824
825 sdp->sd_log_head = sdp->sd_log_flush_head;
826 sdp->sd_log_tail = sdp->sd_log_head;
827
828 up_write(&sdp->sd_log_flush_lock);
829}
830
831
832
833
834
835
836
837
838void gfs2_meta_syncfs(struct gfs2_sbd *sdp)
839{
840 gfs2_log_flush(sdp, NULL);
841 for (;;) {
842 gfs2_ail1_start(sdp);
843 gfs2_ail1_wait(sdp);
844 if (gfs2_ail1_empty(sdp))
845 break;
846 }
847 gfs2_log_flush(sdp, NULL);
848}
849
850static inline int gfs2_jrnl_flush_reqd(struct gfs2_sbd *sdp)
851{
852 return (atomic_read(&sdp->sd_log_pinned) >= atomic_read(&sdp->sd_log_thresh1));
853}
854
855static inline int gfs2_ail_flush_reqd(struct gfs2_sbd *sdp)
856{
857 unsigned int used_blocks = sdp->sd_jdesc->jd_blocks - atomic_read(&sdp->sd_log_blks_free);
858 return used_blocks >= atomic_read(&sdp->sd_log_thresh2);
859}
860
861
862
863
864
865
866
867
868
869int gfs2_logd(void *data)
870{
871 struct gfs2_sbd *sdp = data;
872 unsigned long t = 1;
873 DEFINE_WAIT(wait);
874
875 while (!kthread_should_stop()) {
876
877 if (gfs2_jrnl_flush_reqd(sdp) || t == 0) {
878 gfs2_ail1_empty(sdp);
879 gfs2_log_flush(sdp, NULL);
880 }
881
882 if (gfs2_ail_flush_reqd(sdp)) {
883 gfs2_ail1_start(sdp);
884 gfs2_ail1_wait(sdp);
885 gfs2_ail1_empty(sdp);
886 gfs2_log_flush(sdp, NULL);
887 }
888
889 if (!gfs2_ail_flush_reqd(sdp))
890 wake_up(&sdp->sd_log_waitq);
891
892 t = gfs2_tune_get(sdp, gt_logd_secs) * HZ;
893
894 try_to_freeze();
895
896 do {
897 prepare_to_wait(&sdp->sd_logd_waitq, &wait,
898 TASK_INTERRUPTIBLE);
899 if (!gfs2_ail_flush_reqd(sdp) &&
900 !gfs2_jrnl_flush_reqd(sdp) &&
901 !kthread_should_stop())
902 t = schedule_timeout(t);
903 } while(t && !gfs2_ail_flush_reqd(sdp) &&
904 !gfs2_jrnl_flush_reqd(sdp) &&
905 !kthread_should_stop());
906 finish_wait(&sdp->sd_logd_waitq, &wait);
907 }
908
909 return 0;
910}
911
912