1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26#include <linux/fs.h>
27#include <linux/types.h>
28#include <linux/slab.h>
29#include <linux/highmem.h>
30#include <linux/bitops.h>
31
32#include <cluster/masklog.h>
33
34#include "ocfs2.h"
35
36#include "alloc.h"
37#include "blockcheck.h"
38#include "dlmglue.h"
39#include "inode.h"
40#include "journal.h"
41#include "localalloc.h"
42#include "suballoc.h"
43#include "super.h"
44#include "sysfile.h"
45#include "ocfs2_trace.h"
46
47#include "buffer_head_io.h"
48
49#define OCFS2_LOCAL_ALLOC(dinode) (&((dinode)->id2.i_lab))
50
51static u32 ocfs2_local_alloc_count_bits(struct ocfs2_dinode *alloc);
52
53static int ocfs2_local_alloc_find_clear_bits(struct ocfs2_super *osb,
54 struct ocfs2_dinode *alloc,
55 u32 *numbits,
56 struct ocfs2_alloc_reservation *resv);
57
58static void ocfs2_clear_local_alloc(struct ocfs2_dinode *alloc);
59
60static int ocfs2_sync_local_to_main(struct ocfs2_super *osb,
61 handle_t *handle,
62 struct ocfs2_dinode *alloc,
63 struct inode *main_bm_inode,
64 struct buffer_head *main_bm_bh);
65
66static int ocfs2_local_alloc_reserve_for_window(struct ocfs2_super *osb,
67 struct ocfs2_alloc_context **ac,
68 struct inode **bitmap_inode,
69 struct buffer_head **bitmap_bh);
70
71static int ocfs2_local_alloc_new_window(struct ocfs2_super *osb,
72 handle_t *handle,
73 struct ocfs2_alloc_context *ac);
74
75static int ocfs2_local_alloc_slide_window(struct ocfs2_super *osb,
76 struct inode *local_alloc_inode);
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115#define OCFS2_LA_MAX_DEFAULT_MB 256
116#define OCFS2_LA_OLD_DEFAULT 8
117unsigned int ocfs2_la_default_mb(struct ocfs2_super *osb)
118{
119 unsigned int la_mb;
120 unsigned int gd_mb;
121 unsigned int la_max_mb;
122 unsigned int megs_per_slot;
123 struct super_block *sb = osb->sb;
124
125 gd_mb = ocfs2_clusters_to_megabytes(osb->sb,
126 8 * ocfs2_group_bitmap_size(sb, 0, osb->s_feature_incompat));
127
128
129
130
131
132
133 if ((sb->s_blocksize == 512 && osb->s_clustersize <= 8192)
134 || (sb->s_blocksize == 1024 && osb->s_clustersize == 4096))
135 return OCFS2_LA_OLD_DEFAULT;
136
137
138
139
140
141 gd_mb -= 16;
142 gd_mb &= 0xFFFFFFFB;
143
144 la_mb = gd_mb;
145
146
147
148
149 if (la_mb > OCFS2_LA_MAX_DEFAULT_MB) {
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168 if (gd_mb > (2 * OCFS2_LA_MAX_DEFAULT_MB))
169 la_mb = 256;
170 else {
171 unsigned int gd_mult = gd_mb;
172
173 while (gd_mult > 256)
174 gd_mult = gd_mult >> 1;
175
176 la_mb = gd_mult;
177 }
178 }
179
180 megs_per_slot = osb->osb_clusters_at_boot / osb->max_slots;
181 megs_per_slot = ocfs2_clusters_to_megabytes(osb->sb, megs_per_slot);
182
183 if (megs_per_slot < la_mb)
184 la_mb = megs_per_slot;
185
186
187 la_max_mb = ocfs2_clusters_to_megabytes(osb->sb,
188 ocfs2_local_alloc_size(sb) * 8);
189 if (la_mb > la_max_mb)
190 la_mb = la_max_mb;
191
192 return la_mb;
193}
194
195void ocfs2_la_set_sizes(struct ocfs2_super *osb, int requested_mb)
196{
197 struct super_block *sb = osb->sb;
198 unsigned int la_default_mb = ocfs2_la_default_mb(osb);
199 unsigned int la_max_mb;
200
201 la_max_mb = ocfs2_clusters_to_megabytes(sb,
202 ocfs2_local_alloc_size(sb) * 8);
203
204 trace_ocfs2_la_set_sizes(requested_mb, la_max_mb, la_default_mb);
205
206 if (requested_mb == -1) {
207
208 osb->local_alloc_default_bits =
209 ocfs2_megabytes_to_clusters(sb, la_default_mb);
210 } else if (requested_mb > la_max_mb) {
211
212 osb->local_alloc_default_bits =
213 ocfs2_megabytes_to_clusters(sb, la_max_mb);
214 } else {
215 osb->local_alloc_default_bits =
216 ocfs2_megabytes_to_clusters(sb, requested_mb);
217 }
218
219 osb->local_alloc_bits = osb->local_alloc_default_bits;
220}
221
222static inline int ocfs2_la_state_enabled(struct ocfs2_super *osb)
223{
224 return (osb->local_alloc_state == OCFS2_LA_THROTTLED ||
225 osb->local_alloc_state == OCFS2_LA_ENABLED);
226}
227
228void ocfs2_local_alloc_seen_free_bits(struct ocfs2_super *osb,
229 unsigned int num_clusters)
230{
231 spin_lock(&osb->osb_lock);
232 if (osb->local_alloc_state == OCFS2_LA_DISABLED ||
233 osb->local_alloc_state == OCFS2_LA_THROTTLED)
234 if (num_clusters >= osb->local_alloc_default_bits) {
235 cancel_delayed_work(&osb->la_enable_wq);
236 osb->local_alloc_state = OCFS2_LA_ENABLED;
237 }
238 spin_unlock(&osb->osb_lock);
239}
240
241void ocfs2_la_enable_worker(struct work_struct *work)
242{
243 struct ocfs2_super *osb =
244 container_of(work, struct ocfs2_super,
245 la_enable_wq.work);
246 spin_lock(&osb->osb_lock);
247 osb->local_alloc_state = OCFS2_LA_ENABLED;
248 spin_unlock(&osb->osb_lock);
249}
250
251
252
253
254
255
256
257
258int ocfs2_alloc_should_use_local(struct ocfs2_super *osb, u64 bits)
259{
260 int ret = 0;
261 int la_bits;
262
263 spin_lock(&osb->osb_lock);
264 la_bits = osb->local_alloc_bits;
265
266 if (!ocfs2_la_state_enabled(osb))
267 goto bail;
268
269
270
271
272
273 if (bits > (la_bits / 2))
274 goto bail;
275
276 ret = 1;
277bail:
278 trace_ocfs2_alloc_should_use_local(
279 (unsigned long long)bits, osb->local_alloc_state, la_bits, ret);
280 spin_unlock(&osb->osb_lock);
281 return ret;
282}
283
284int ocfs2_load_local_alloc(struct ocfs2_super *osb)
285{
286 int status = 0;
287 struct ocfs2_dinode *alloc = NULL;
288 struct buffer_head *alloc_bh = NULL;
289 u32 num_used;
290 struct inode *inode = NULL;
291 struct ocfs2_local_alloc *la;
292
293 if (osb->local_alloc_bits == 0)
294 goto bail;
295
296 if (osb->local_alloc_bits >= osb->bitmap_cpg) {
297 mlog(ML_NOTICE, "Requested local alloc window %d is larger "
298 "than max possible %u. Using defaults.\n",
299 osb->local_alloc_bits, (osb->bitmap_cpg - 1));
300 osb->local_alloc_bits =
301 ocfs2_megabytes_to_clusters(osb->sb,
302 ocfs2_la_default_mb(osb));
303 }
304
305
306 inode = ocfs2_get_system_file_inode(osb, LOCAL_ALLOC_SYSTEM_INODE,
307 osb->slot_num);
308 if (!inode) {
309 status = -EINVAL;
310 mlog_errno(status);
311 goto bail;
312 }
313
314 status = ocfs2_read_inode_block_full(inode, &alloc_bh,
315 OCFS2_BH_IGNORE_CACHE);
316 if (status < 0) {
317 mlog_errno(status);
318 goto bail;
319 }
320
321 alloc = (struct ocfs2_dinode *) alloc_bh->b_data;
322 la = OCFS2_LOCAL_ALLOC(alloc);
323
324 if (!(le32_to_cpu(alloc->i_flags) &
325 (OCFS2_LOCAL_ALLOC_FL|OCFS2_BITMAP_FL))) {
326 mlog(ML_ERROR, "Invalid local alloc inode, %llu\n",
327 (unsigned long long)OCFS2_I(inode)->ip_blkno);
328 status = -EINVAL;
329 goto bail;
330 }
331
332 if ((la->la_size == 0) ||
333 (le16_to_cpu(la->la_size) > ocfs2_local_alloc_size(inode->i_sb))) {
334 mlog(ML_ERROR, "Local alloc size is invalid (la_size = %u)\n",
335 le16_to_cpu(la->la_size));
336 status = -EINVAL;
337 goto bail;
338 }
339
340
341 num_used = ocfs2_local_alloc_count_bits(alloc);
342
343
344
345 if (num_used
346 || alloc->id1.bitmap1.i_used
347 || alloc->id1.bitmap1.i_total
348 || la->la_bm_off)
349 mlog(ML_ERROR, "Local alloc hasn't been recovered!\n"
350 "found = %u, set = %u, taken = %u, off = %u\n",
351 num_used, le32_to_cpu(alloc->id1.bitmap1.i_used),
352 le32_to_cpu(alloc->id1.bitmap1.i_total),
353 OCFS2_LOCAL_ALLOC(alloc)->la_bm_off);
354
355 osb->local_alloc_bh = alloc_bh;
356 osb->local_alloc_state = OCFS2_LA_ENABLED;
357
358bail:
359 if (status < 0)
360 brelse(alloc_bh);
361 iput(inode);
362
363 trace_ocfs2_load_local_alloc(osb->local_alloc_bits);
364
365 if (status)
366 mlog_errno(status);
367 return status;
368}
369
370
371
372
373
374
375
376
377void ocfs2_shutdown_local_alloc(struct ocfs2_super *osb)
378{
379 int status;
380 handle_t *handle;
381 struct inode *local_alloc_inode = NULL;
382 struct buffer_head *bh = NULL;
383 struct buffer_head *main_bm_bh = NULL;
384 struct inode *main_bm_inode = NULL;
385 struct ocfs2_dinode *alloc_copy = NULL;
386 struct ocfs2_dinode *alloc = NULL;
387
388 cancel_delayed_work(&osb->la_enable_wq);
389 flush_workqueue(ocfs2_wq);
390
391 if (osb->local_alloc_state == OCFS2_LA_UNUSED)
392 goto out;
393
394 local_alloc_inode =
395 ocfs2_get_system_file_inode(osb,
396 LOCAL_ALLOC_SYSTEM_INODE,
397 osb->slot_num);
398 if (!local_alloc_inode) {
399 status = -ENOENT;
400 mlog_errno(status);
401 goto out;
402 }
403
404 osb->local_alloc_state = OCFS2_LA_DISABLED;
405
406 ocfs2_resmap_uninit(&osb->osb_la_resmap);
407
408 main_bm_inode = ocfs2_get_system_file_inode(osb,
409 GLOBAL_BITMAP_SYSTEM_INODE,
410 OCFS2_INVALID_SLOT);
411 if (!main_bm_inode) {
412 status = -EINVAL;
413 mlog_errno(status);
414 goto out;
415 }
416
417 inode_lock(main_bm_inode);
418
419 status = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
420 if (status < 0) {
421 mlog_errno(status);
422 goto out_mutex;
423 }
424
425
426 handle = ocfs2_start_trans(osb, OCFS2_WINDOW_MOVE_CREDITS);
427 if (IS_ERR(handle)) {
428 mlog_errno(PTR_ERR(handle));
429 handle = NULL;
430 goto out_unlock;
431 }
432
433 bh = osb->local_alloc_bh;
434 alloc = (struct ocfs2_dinode *) bh->b_data;
435
436 alloc_copy = kmalloc(bh->b_size, GFP_NOFS);
437 if (!alloc_copy) {
438 status = -ENOMEM;
439 goto out_commit;
440 }
441 memcpy(alloc_copy, alloc, bh->b_size);
442
443 status = ocfs2_journal_access_di(handle, INODE_CACHE(local_alloc_inode),
444 bh, OCFS2_JOURNAL_ACCESS_WRITE);
445 if (status < 0) {
446 mlog_errno(status);
447 goto out_commit;
448 }
449
450 ocfs2_clear_local_alloc(alloc);
451 ocfs2_journal_dirty(handle, bh);
452
453 brelse(bh);
454 osb->local_alloc_bh = NULL;
455 osb->local_alloc_state = OCFS2_LA_UNUSED;
456
457 status = ocfs2_sync_local_to_main(osb, handle, alloc_copy,
458 main_bm_inode, main_bm_bh);
459 if (status < 0)
460 mlog_errno(status);
461
462out_commit:
463 ocfs2_commit_trans(osb, handle);
464
465out_unlock:
466 brelse(main_bm_bh);
467
468 ocfs2_inode_unlock(main_bm_inode, 1);
469
470out_mutex:
471 inode_unlock(main_bm_inode);
472 iput(main_bm_inode);
473
474out:
475 iput(local_alloc_inode);
476
477 kfree(alloc_copy);
478}
479
480
481
482
483
484
485
486
487int ocfs2_begin_local_alloc_recovery(struct ocfs2_super *osb,
488 int slot_num,
489 struct ocfs2_dinode **alloc_copy)
490{
491 int status = 0;
492 struct buffer_head *alloc_bh = NULL;
493 struct inode *inode = NULL;
494 struct ocfs2_dinode *alloc;
495
496 trace_ocfs2_begin_local_alloc_recovery(slot_num);
497
498 *alloc_copy = NULL;
499
500 inode = ocfs2_get_system_file_inode(osb,
501 LOCAL_ALLOC_SYSTEM_INODE,
502 slot_num);
503 if (!inode) {
504 status = -EINVAL;
505 mlog_errno(status);
506 goto bail;
507 }
508
509 inode_lock(inode);
510
511 status = ocfs2_read_inode_block_full(inode, &alloc_bh,
512 OCFS2_BH_IGNORE_CACHE);
513 if (status < 0) {
514 mlog_errno(status);
515 goto bail;
516 }
517
518 *alloc_copy = kmalloc(alloc_bh->b_size, GFP_KERNEL);
519 if (!(*alloc_copy)) {
520 status = -ENOMEM;
521 goto bail;
522 }
523 memcpy((*alloc_copy), alloc_bh->b_data, alloc_bh->b_size);
524
525 alloc = (struct ocfs2_dinode *) alloc_bh->b_data;
526 ocfs2_clear_local_alloc(alloc);
527
528 ocfs2_compute_meta_ecc(osb->sb, alloc_bh->b_data, &alloc->i_check);
529 status = ocfs2_write_block(osb, alloc_bh, INODE_CACHE(inode));
530 if (status < 0)
531 mlog_errno(status);
532
533bail:
534 if (status < 0) {
535 kfree(*alloc_copy);
536 *alloc_copy = NULL;
537 }
538
539 brelse(alloc_bh);
540
541 if (inode) {
542 inode_unlock(inode);
543 iput(inode);
544 }
545
546 if (status)
547 mlog_errno(status);
548 return status;
549}
550
551
552
553
554
555
556
557int ocfs2_complete_local_alloc_recovery(struct ocfs2_super *osb,
558 struct ocfs2_dinode *alloc)
559{
560 int status;
561 handle_t *handle;
562 struct buffer_head *main_bm_bh = NULL;
563 struct inode *main_bm_inode;
564
565 main_bm_inode = ocfs2_get_system_file_inode(osb,
566 GLOBAL_BITMAP_SYSTEM_INODE,
567 OCFS2_INVALID_SLOT);
568 if (!main_bm_inode) {
569 status = -EINVAL;
570 mlog_errno(status);
571 goto out;
572 }
573
574 inode_lock(main_bm_inode);
575
576 status = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
577 if (status < 0) {
578 mlog_errno(status);
579 goto out_mutex;
580 }
581
582 handle = ocfs2_start_trans(osb, OCFS2_WINDOW_MOVE_CREDITS);
583 if (IS_ERR(handle)) {
584 status = PTR_ERR(handle);
585 handle = NULL;
586 mlog_errno(status);
587 goto out_unlock;
588 }
589
590
591 handle->h_sync = 1;
592
593 status = ocfs2_sync_local_to_main(osb, handle, alloc,
594 main_bm_inode, main_bm_bh);
595 if (status < 0)
596 mlog_errno(status);
597
598 ocfs2_commit_trans(osb, handle);
599
600out_unlock:
601 ocfs2_inode_unlock(main_bm_inode, 1);
602
603out_mutex:
604 inode_unlock(main_bm_inode);
605
606 brelse(main_bm_bh);
607
608 iput(main_bm_inode);
609
610out:
611 if (!status)
612 ocfs2_init_steal_slots(osb);
613 if (status)
614 mlog_errno(status);
615 return status;
616}
617
618
619
620
621
622
623
624
625int ocfs2_reserve_local_alloc_bits(struct ocfs2_super *osb,
626 u32 bits_wanted,
627 struct ocfs2_alloc_context *ac)
628{
629 int status;
630 struct ocfs2_dinode *alloc;
631 struct inode *local_alloc_inode;
632 unsigned int free_bits;
633
634 BUG_ON(!ac);
635
636 local_alloc_inode =
637 ocfs2_get_system_file_inode(osb,
638 LOCAL_ALLOC_SYSTEM_INODE,
639 osb->slot_num);
640 if (!local_alloc_inode) {
641 status = -ENOENT;
642 mlog_errno(status);
643 goto bail;
644 }
645
646 inode_lock(local_alloc_inode);
647
648
649
650
651
652 spin_lock(&osb->osb_lock);
653 if (!ocfs2_la_state_enabled(osb) ||
654 (bits_wanted > osb->local_alloc_bits)) {
655 spin_unlock(&osb->osb_lock);
656 status = -ENOSPC;
657 goto bail;
658 }
659 spin_unlock(&osb->osb_lock);
660
661 alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
662
663#ifdef CONFIG_OCFS2_DEBUG_FS
664 if (le32_to_cpu(alloc->id1.bitmap1.i_used) !=
665 ocfs2_local_alloc_count_bits(alloc)) {
666 ocfs2_error(osb->sb, "local alloc inode %llu says it has %u used bits, but a count shows %u\n",
667 (unsigned long long)le64_to_cpu(alloc->i_blkno),
668 le32_to_cpu(alloc->id1.bitmap1.i_used),
669 ocfs2_local_alloc_count_bits(alloc));
670 status = -EIO;
671 goto bail;
672 }
673#endif
674
675 free_bits = le32_to_cpu(alloc->id1.bitmap1.i_total) -
676 le32_to_cpu(alloc->id1.bitmap1.i_used);
677 if (bits_wanted > free_bits) {
678
679 status =
680 ocfs2_local_alloc_slide_window(osb, local_alloc_inode);
681 if (status < 0) {
682 if (status != -ENOSPC)
683 mlog_errno(status);
684 goto bail;
685 }
686
687
688
689
690
691
692
693 status = -ENOSPC;
694 if (!ocfs2_la_state_enabled(osb))
695 goto bail;
696
697 free_bits = le32_to_cpu(alloc->id1.bitmap1.i_total) -
698 le32_to_cpu(alloc->id1.bitmap1.i_used);
699 if (bits_wanted > free_bits)
700 goto bail;
701 }
702
703 ac->ac_inode = local_alloc_inode;
704
705 ac->ac_alloc_slot = osb->slot_num;
706 ac->ac_which = OCFS2_AC_USE_LOCAL;
707 get_bh(osb->local_alloc_bh);
708 ac->ac_bh = osb->local_alloc_bh;
709 status = 0;
710bail:
711 if (status < 0 && local_alloc_inode) {
712 inode_unlock(local_alloc_inode);
713 iput(local_alloc_inode);
714 }
715
716 trace_ocfs2_reserve_local_alloc_bits(
717 (unsigned long long)ac->ac_max_block,
718 bits_wanted, osb->slot_num, status);
719
720 if (status)
721 mlog_errno(status);
722 return status;
723}
724
725int ocfs2_claim_local_alloc_bits(struct ocfs2_super *osb,
726 handle_t *handle,
727 struct ocfs2_alloc_context *ac,
728 u32 bits_wanted,
729 u32 *bit_off,
730 u32 *num_bits)
731{
732 int status, start;
733 struct inode *local_alloc_inode;
734 void *bitmap;
735 struct ocfs2_dinode *alloc;
736 struct ocfs2_local_alloc *la;
737
738 BUG_ON(ac->ac_which != OCFS2_AC_USE_LOCAL);
739
740 local_alloc_inode = ac->ac_inode;
741 alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
742 la = OCFS2_LOCAL_ALLOC(alloc);
743
744 start = ocfs2_local_alloc_find_clear_bits(osb, alloc, &bits_wanted,
745 ac->ac_resv);
746 if (start == -1) {
747
748 status = -ENOSPC;
749 mlog_errno(status);
750 goto bail;
751 }
752
753 bitmap = la->la_bitmap;
754 *bit_off = le32_to_cpu(la->la_bm_off) + start;
755 *num_bits = bits_wanted;
756
757 status = ocfs2_journal_access_di(handle,
758 INODE_CACHE(local_alloc_inode),
759 osb->local_alloc_bh,
760 OCFS2_JOURNAL_ACCESS_WRITE);
761 if (status < 0) {
762 mlog_errno(status);
763 goto bail;
764 }
765
766 ocfs2_resmap_claimed_bits(&osb->osb_la_resmap, ac->ac_resv, start,
767 bits_wanted);
768
769 while(bits_wanted--)
770 ocfs2_set_bit(start++, bitmap);
771
772 le32_add_cpu(&alloc->id1.bitmap1.i_used, *num_bits);
773 ocfs2_journal_dirty(handle, osb->local_alloc_bh);
774
775bail:
776 if (status)
777 mlog_errno(status);
778 return status;
779}
780
781int ocfs2_free_local_alloc_bits(struct ocfs2_super *osb,
782 handle_t *handle,
783 struct ocfs2_alloc_context *ac,
784 u32 bit_off,
785 u32 num_bits)
786{
787 int status, start;
788 u32 clear_bits;
789 struct inode *local_alloc_inode;
790 void *bitmap;
791 struct ocfs2_dinode *alloc;
792 struct ocfs2_local_alloc *la;
793
794 BUG_ON(ac->ac_which != OCFS2_AC_USE_LOCAL);
795
796 local_alloc_inode = ac->ac_inode;
797 alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
798 la = OCFS2_LOCAL_ALLOC(alloc);
799
800 bitmap = la->la_bitmap;
801 start = bit_off - le32_to_cpu(la->la_bm_off);
802 clear_bits = num_bits;
803
804 status = ocfs2_journal_access_di(handle,
805 INODE_CACHE(local_alloc_inode),
806 osb->local_alloc_bh,
807 OCFS2_JOURNAL_ACCESS_WRITE);
808 if (status < 0) {
809 mlog_errno(status);
810 goto bail;
811 }
812
813 while (clear_bits--)
814 ocfs2_clear_bit(start++, bitmap);
815
816 le32_add_cpu(&alloc->id1.bitmap1.i_used, -num_bits);
817 ocfs2_journal_dirty(handle, osb->local_alloc_bh);
818
819bail:
820 return status;
821}
822
823static u32 ocfs2_local_alloc_count_bits(struct ocfs2_dinode *alloc)
824{
825 u32 count;
826 struct ocfs2_local_alloc *la = OCFS2_LOCAL_ALLOC(alloc);
827
828 count = memweight(la->la_bitmap, le16_to_cpu(la->la_size));
829
830 trace_ocfs2_local_alloc_count_bits(count);
831 return count;
832}
833
834static int ocfs2_local_alloc_find_clear_bits(struct ocfs2_super *osb,
835 struct ocfs2_dinode *alloc,
836 u32 *numbits,
837 struct ocfs2_alloc_reservation *resv)
838{
839 int numfound = 0, bitoff, left, startoff, lastzero;
840 int local_resv = 0;
841 struct ocfs2_alloc_reservation r;
842 void *bitmap = NULL;
843 struct ocfs2_reservation_map *resmap = &osb->osb_la_resmap;
844
845 if (!alloc->id1.bitmap1.i_total) {
846 bitoff = -1;
847 goto bail;
848 }
849
850 if (!resv) {
851 local_resv = 1;
852 ocfs2_resv_init_once(&r);
853 ocfs2_resv_set_type(&r, OCFS2_RESV_FLAG_TMP);
854 resv = &r;
855 }
856
857 numfound = *numbits;
858 if (ocfs2_resmap_resv_bits(resmap, resv, &bitoff, &numfound) == 0) {
859 if (numfound < *numbits)
860 *numbits = numfound;
861 goto bail;
862 }
863
864
865
866
867
868 BUG_ON(osb->osb_resv_level != 0);
869
870
871
872
873
874 bitmap = OCFS2_LOCAL_ALLOC(alloc)->la_bitmap;
875
876 numfound = bitoff = startoff = 0;
877 lastzero = -1;
878 left = le32_to_cpu(alloc->id1.bitmap1.i_total);
879 while ((bitoff = ocfs2_find_next_zero_bit(bitmap, left, startoff)) != -1) {
880 if (bitoff == left) {
881
882 break;
883 }
884
885
886
887
888
889 if (bitoff == startoff) {
890
891 numfound++;
892 startoff++;
893 } else {
894
895 numfound = 1;
896 startoff = bitoff+1;
897 }
898
899 if (numfound == *numbits) {
900
901 break;
902 }
903 }
904
905 trace_ocfs2_local_alloc_find_clear_bits_search_bitmap(bitoff, numfound);
906
907 if (numfound == *numbits)
908 bitoff = startoff - numfound;
909 else
910 bitoff = -1;
911
912bail:
913 if (local_resv)
914 ocfs2_resv_discard(resmap, resv);
915
916 trace_ocfs2_local_alloc_find_clear_bits(*numbits,
917 le32_to_cpu(alloc->id1.bitmap1.i_total),
918 bitoff, numfound);
919
920 return bitoff;
921}
922
923static void ocfs2_clear_local_alloc(struct ocfs2_dinode *alloc)
924{
925 struct ocfs2_local_alloc *la = OCFS2_LOCAL_ALLOC(alloc);
926 int i;
927
928 alloc->id1.bitmap1.i_total = 0;
929 alloc->id1.bitmap1.i_used = 0;
930 la->la_bm_off = 0;
931 for(i = 0; i < le16_to_cpu(la->la_size); i++)
932 la->la_bitmap[i] = 0;
933}
934
935#if 0
936
937static void ocfs2_verify_zero_bits(unsigned long *bitmap,
938 unsigned int start,
939 unsigned int count)
940{
941 unsigned int tmp = count;
942 while(tmp--) {
943 if (ocfs2_test_bit(start + tmp, bitmap)) {
944 printk("ocfs2_verify_zero_bits: start = %u, count = "
945 "%u\n", start, count);
946 printk("ocfs2_verify_zero_bits: bit %u is set!",
947 start + tmp);
948 BUG();
949 }
950 }
951}
952#endif
953
954
955
956
957
958
959
960static int ocfs2_sync_local_to_main(struct ocfs2_super *osb,
961 handle_t *handle,
962 struct ocfs2_dinode *alloc,
963 struct inode *main_bm_inode,
964 struct buffer_head *main_bm_bh)
965{
966 int status = 0;
967 int bit_off, left, count, start;
968 u64 la_start_blk;
969 u64 blkno;
970 void *bitmap;
971 struct ocfs2_local_alloc *la = OCFS2_LOCAL_ALLOC(alloc);
972
973 trace_ocfs2_sync_local_to_main(
974 le32_to_cpu(alloc->id1.bitmap1.i_total),
975 le32_to_cpu(alloc->id1.bitmap1.i_used));
976
977 if (!alloc->id1.bitmap1.i_total) {
978 goto bail;
979 }
980
981 if (le32_to_cpu(alloc->id1.bitmap1.i_used) ==
982 le32_to_cpu(alloc->id1.bitmap1.i_total)) {
983 goto bail;
984 }
985
986 la_start_blk = ocfs2_clusters_to_blocks(osb->sb,
987 le32_to_cpu(la->la_bm_off));
988 bitmap = la->la_bitmap;
989 start = count = bit_off = 0;
990 left = le32_to_cpu(alloc->id1.bitmap1.i_total);
991
992 while ((bit_off = ocfs2_find_next_zero_bit(bitmap, left, start))
993 != -1) {
994 if ((bit_off < left) && (bit_off == start)) {
995 count++;
996 start++;
997 continue;
998 }
999 if (count) {
1000 blkno = la_start_blk +
1001 ocfs2_clusters_to_blocks(osb->sb,
1002 start - count);
1003
1004 trace_ocfs2_sync_local_to_main_free(
1005 count, start - count,
1006 (unsigned long long)la_start_blk,
1007 (unsigned long long)blkno);
1008
1009 status = ocfs2_release_clusters(handle,
1010 main_bm_inode,
1011 main_bm_bh, blkno,
1012 count);
1013 if (status < 0) {
1014 mlog_errno(status);
1015 goto bail;
1016 }
1017 }
1018 if (bit_off >= left)
1019 break;
1020 count = 1;
1021 start = bit_off + 1;
1022 }
1023
1024bail:
1025 if (status)
1026 mlog_errno(status);
1027 return status;
1028}
1029
1030enum ocfs2_la_event {
1031 OCFS2_LA_EVENT_SLIDE,
1032 OCFS2_LA_EVENT_FRAGMENTED,
1033
1034
1035
1036
1037 OCFS2_LA_EVENT_ENOSPC,
1038
1039
1040};
1041#define OCFS2_LA_ENABLE_INTERVAL (30 * HZ)
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052static int ocfs2_recalc_la_window(struct ocfs2_super *osb,
1053 enum ocfs2_la_event event)
1054{
1055 unsigned int bits;
1056 int state;
1057
1058 spin_lock(&osb->osb_lock);
1059 if (osb->local_alloc_state == OCFS2_LA_DISABLED) {
1060 WARN_ON_ONCE(osb->local_alloc_state == OCFS2_LA_DISABLED);
1061 goto out_unlock;
1062 }
1063
1064
1065
1066
1067 if (event == OCFS2_LA_EVENT_ENOSPC ||
1068 event == OCFS2_LA_EVENT_FRAGMENTED) {
1069
1070
1071
1072
1073
1074 bits = osb->local_alloc_bits >> 1;
1075 if (bits > ocfs2_megabytes_to_clusters(osb->sb, 1)) {
1076
1077
1078
1079
1080
1081
1082
1083 osb->local_alloc_state = OCFS2_LA_THROTTLED;
1084 osb->local_alloc_bits = bits;
1085 } else {
1086 osb->local_alloc_state = OCFS2_LA_DISABLED;
1087 }
1088 queue_delayed_work(ocfs2_wq, &osb->la_enable_wq,
1089 OCFS2_LA_ENABLE_INTERVAL);
1090 goto out_unlock;
1091 }
1092
1093
1094
1095
1096
1097
1098
1099 if (osb->local_alloc_state != OCFS2_LA_THROTTLED)
1100 osb->local_alloc_bits = osb->local_alloc_default_bits;
1101
1102out_unlock:
1103 state = osb->local_alloc_state;
1104 spin_unlock(&osb->osb_lock);
1105
1106 return state;
1107}
1108
1109static int ocfs2_local_alloc_reserve_for_window(struct ocfs2_super *osb,
1110 struct ocfs2_alloc_context **ac,
1111 struct inode **bitmap_inode,
1112 struct buffer_head **bitmap_bh)
1113{
1114 int status;
1115
1116 *ac = kzalloc(sizeof(struct ocfs2_alloc_context), GFP_KERNEL);
1117 if (!(*ac)) {
1118 status = -ENOMEM;
1119 mlog_errno(status);
1120 goto bail;
1121 }
1122
1123retry_enospc:
1124 (*ac)->ac_bits_wanted = osb->local_alloc_bits;
1125 status = ocfs2_reserve_cluster_bitmap_bits(osb, *ac);
1126 if (status == -ENOSPC) {
1127 if (ocfs2_recalc_la_window(osb, OCFS2_LA_EVENT_ENOSPC) ==
1128 OCFS2_LA_DISABLED)
1129 goto bail;
1130
1131 ocfs2_free_ac_resource(*ac);
1132 memset(*ac, 0, sizeof(struct ocfs2_alloc_context));
1133 goto retry_enospc;
1134 }
1135 if (status < 0) {
1136 mlog_errno(status);
1137 goto bail;
1138 }
1139
1140 *bitmap_inode = (*ac)->ac_inode;
1141 igrab(*bitmap_inode);
1142 *bitmap_bh = (*ac)->ac_bh;
1143 get_bh(*bitmap_bh);
1144 status = 0;
1145bail:
1146 if ((status < 0) && *ac) {
1147 ocfs2_free_alloc_context(*ac);
1148 *ac = NULL;
1149 }
1150
1151 if (status)
1152 mlog_errno(status);
1153 return status;
1154}
1155
1156
1157
1158
1159static int ocfs2_local_alloc_new_window(struct ocfs2_super *osb,
1160 handle_t *handle,
1161 struct ocfs2_alloc_context *ac)
1162{
1163 int status = 0;
1164 u32 cluster_off, cluster_count;
1165 struct ocfs2_dinode *alloc = NULL;
1166 struct ocfs2_local_alloc *la;
1167
1168 alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
1169 la = OCFS2_LOCAL_ALLOC(alloc);
1170
1171 trace_ocfs2_local_alloc_new_window(
1172 le32_to_cpu(alloc->id1.bitmap1.i_total),
1173 osb->local_alloc_bits);
1174
1175
1176
1177
1178 ac->ac_last_group = osb->la_last_gd;
1179
1180
1181
1182
1183 status = ocfs2_claim_clusters(handle, ac, osb->local_alloc_bits,
1184 &cluster_off, &cluster_count);
1185 if (status == -ENOSPC) {
1186retry_enospc:
1187
1188
1189
1190
1191
1192 if (ocfs2_recalc_la_window(osb, OCFS2_LA_EVENT_FRAGMENTED) ==
1193 OCFS2_LA_DISABLED)
1194 goto bail;
1195
1196 ac->ac_bits_wanted = osb->local_alloc_bits;
1197 status = ocfs2_claim_clusters(handle, ac,
1198 osb->local_alloc_bits,
1199 &cluster_off,
1200 &cluster_count);
1201 if (status == -ENOSPC)
1202 goto retry_enospc;
1203
1204
1205
1206
1207
1208 if (status == 0) {
1209 spin_lock(&osb->osb_lock);
1210 osb->local_alloc_bits = cluster_count;
1211 spin_unlock(&osb->osb_lock);
1212 }
1213 }
1214 if (status < 0) {
1215 if (status != -ENOSPC)
1216 mlog_errno(status);
1217 goto bail;
1218 }
1219
1220 osb->la_last_gd = ac->ac_last_group;
1221
1222 la->la_bm_off = cpu_to_le32(cluster_off);
1223 alloc->id1.bitmap1.i_total = cpu_to_le32(cluster_count);
1224
1225
1226
1227
1228 alloc->id1.bitmap1.i_used = 0;
1229 memset(OCFS2_LOCAL_ALLOC(alloc)->la_bitmap, 0,
1230 le16_to_cpu(la->la_size));
1231
1232 ocfs2_resmap_restart(&osb->osb_la_resmap, cluster_count,
1233 OCFS2_LOCAL_ALLOC(alloc)->la_bitmap);
1234
1235 trace_ocfs2_local_alloc_new_window_result(
1236 OCFS2_LOCAL_ALLOC(alloc)->la_bm_off,
1237 le32_to_cpu(alloc->id1.bitmap1.i_total));
1238
1239bail:
1240 if (status)
1241 mlog_errno(status);
1242 return status;
1243}
1244
1245
1246
1247static int ocfs2_local_alloc_slide_window(struct ocfs2_super *osb,
1248 struct inode *local_alloc_inode)
1249{
1250 int status = 0;
1251 struct buffer_head *main_bm_bh = NULL;
1252 struct inode *main_bm_inode = NULL;
1253 handle_t *handle = NULL;
1254 struct ocfs2_dinode *alloc;
1255 struct ocfs2_dinode *alloc_copy = NULL;
1256 struct ocfs2_alloc_context *ac = NULL;
1257
1258 ocfs2_recalc_la_window(osb, OCFS2_LA_EVENT_SLIDE);
1259
1260
1261 status = ocfs2_local_alloc_reserve_for_window(osb,
1262 &ac,
1263 &main_bm_inode,
1264 &main_bm_bh);
1265 if (status < 0) {
1266 if (status != -ENOSPC)
1267 mlog_errno(status);
1268 goto bail;
1269 }
1270
1271 handle = ocfs2_start_trans(osb, OCFS2_WINDOW_MOVE_CREDITS);
1272 if (IS_ERR(handle)) {
1273 status = PTR_ERR(handle);
1274 handle = NULL;
1275 mlog_errno(status);
1276 goto bail;
1277 }
1278
1279 alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
1280
1281
1282
1283
1284
1285
1286 alloc_copy = kmalloc(osb->local_alloc_bh->b_size, GFP_NOFS);
1287 if (!alloc_copy) {
1288 status = -ENOMEM;
1289 mlog_errno(status);
1290 goto bail;
1291 }
1292 memcpy(alloc_copy, alloc, osb->local_alloc_bh->b_size);
1293
1294 status = ocfs2_journal_access_di(handle,
1295 INODE_CACHE(local_alloc_inode),
1296 osb->local_alloc_bh,
1297 OCFS2_JOURNAL_ACCESS_WRITE);
1298 if (status < 0) {
1299 mlog_errno(status);
1300 goto bail;
1301 }
1302
1303 ocfs2_clear_local_alloc(alloc);
1304 ocfs2_journal_dirty(handle, osb->local_alloc_bh);
1305
1306 status = ocfs2_sync_local_to_main(osb, handle, alloc_copy,
1307 main_bm_inode, main_bm_bh);
1308 if (status < 0) {
1309 mlog_errno(status);
1310 goto bail;
1311 }
1312
1313 status = ocfs2_local_alloc_new_window(osb, handle, ac);
1314 if (status < 0) {
1315 if (status != -ENOSPC)
1316 mlog_errno(status);
1317 goto bail;
1318 }
1319
1320 atomic_inc(&osb->alloc_stats.moves);
1321
1322bail:
1323 if (handle)
1324 ocfs2_commit_trans(osb, handle);
1325
1326 brelse(main_bm_bh);
1327
1328 iput(main_bm_inode);
1329 kfree(alloc_copy);
1330
1331 if (ac)
1332 ocfs2_free_alloc_context(ac);
1333
1334 if (status)
1335 mlog_errno(status);
1336 return status;
1337}
1338
1339