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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);
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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
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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 if (inode)
362 iput(inode);
363
364 trace_ocfs2_load_local_alloc(osb->local_alloc_bits);
365
366 if (status)
367 mlog_errno(status);
368 return status;
369}
370
371
372
373
374
375
376
377
378void ocfs2_shutdown_local_alloc(struct ocfs2_super *osb)
379{
380 int status;
381 handle_t *handle;
382 struct inode *local_alloc_inode = NULL;
383 struct buffer_head *bh = NULL;
384 struct buffer_head *main_bm_bh = NULL;
385 struct inode *main_bm_inode = NULL;
386 struct ocfs2_dinode *alloc_copy = NULL;
387 struct ocfs2_dinode *alloc = NULL;
388
389 cancel_delayed_work(&osb->la_enable_wq);
390 flush_workqueue(ocfs2_wq);
391
392 if (osb->local_alloc_state == OCFS2_LA_UNUSED)
393 goto out;
394
395 local_alloc_inode =
396 ocfs2_get_system_file_inode(osb,
397 LOCAL_ALLOC_SYSTEM_INODE,
398 osb->slot_num);
399 if (!local_alloc_inode) {
400 status = -ENOENT;
401 mlog_errno(status);
402 goto out;
403 }
404
405 osb->local_alloc_state = OCFS2_LA_DISABLED;
406
407 ocfs2_resmap_uninit(&osb->osb_la_resmap);
408
409 main_bm_inode = ocfs2_get_system_file_inode(osb,
410 GLOBAL_BITMAP_SYSTEM_INODE,
411 OCFS2_INVALID_SLOT);
412 if (!main_bm_inode) {
413 status = -EINVAL;
414 mlog_errno(status);
415 goto out;
416 }
417
418 mutex_lock(&main_bm_inode->i_mutex);
419
420 status = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
421 if (status < 0) {
422 mlog_errno(status);
423 goto out_mutex;
424 }
425
426
427 handle = ocfs2_start_trans(osb, OCFS2_WINDOW_MOVE_CREDITS);
428 if (IS_ERR(handle)) {
429 mlog_errno(PTR_ERR(handle));
430 handle = NULL;
431 goto out_unlock;
432 }
433
434 bh = osb->local_alloc_bh;
435 alloc = (struct ocfs2_dinode *) bh->b_data;
436
437 alloc_copy = kmalloc(bh->b_size, GFP_NOFS);
438 if (!alloc_copy) {
439 status = -ENOMEM;
440 goto out_commit;
441 }
442 memcpy(alloc_copy, alloc, bh->b_size);
443
444 status = ocfs2_journal_access_di(handle, INODE_CACHE(local_alloc_inode),
445 bh, OCFS2_JOURNAL_ACCESS_WRITE);
446 if (status < 0) {
447 mlog_errno(status);
448 goto out_commit;
449 }
450
451 ocfs2_clear_local_alloc(alloc);
452 ocfs2_journal_dirty(handle, bh);
453
454 brelse(bh);
455 osb->local_alloc_bh = NULL;
456 osb->local_alloc_state = OCFS2_LA_UNUSED;
457
458 status = ocfs2_sync_local_to_main(osb, handle, alloc_copy,
459 main_bm_inode, main_bm_bh);
460 if (status < 0)
461 mlog_errno(status);
462
463out_commit:
464 ocfs2_commit_trans(osb, handle);
465
466out_unlock:
467 brelse(main_bm_bh);
468
469 ocfs2_inode_unlock(main_bm_inode, 1);
470
471out_mutex:
472 mutex_unlock(&main_bm_inode->i_mutex);
473 iput(main_bm_inode);
474
475out:
476 if (local_alloc_inode)
477 iput(local_alloc_inode);
478
479 kfree(alloc_copy);
480}
481
482
483
484
485
486
487
488
489int ocfs2_begin_local_alloc_recovery(struct ocfs2_super *osb,
490 int slot_num,
491 struct ocfs2_dinode **alloc_copy)
492{
493 int status = 0;
494 struct buffer_head *alloc_bh = NULL;
495 struct inode *inode = NULL;
496 struct ocfs2_dinode *alloc;
497
498 trace_ocfs2_begin_local_alloc_recovery(slot_num);
499
500 *alloc_copy = NULL;
501
502 inode = ocfs2_get_system_file_inode(osb,
503 LOCAL_ALLOC_SYSTEM_INODE,
504 slot_num);
505 if (!inode) {
506 status = -EINVAL;
507 mlog_errno(status);
508 goto bail;
509 }
510
511 mutex_lock(&inode->i_mutex);
512
513 status = ocfs2_read_inode_block_full(inode, &alloc_bh,
514 OCFS2_BH_IGNORE_CACHE);
515 if (status < 0) {
516 mlog_errno(status);
517 goto bail;
518 }
519
520 *alloc_copy = kmalloc(alloc_bh->b_size, GFP_KERNEL);
521 if (!(*alloc_copy)) {
522 status = -ENOMEM;
523 goto bail;
524 }
525 memcpy((*alloc_copy), alloc_bh->b_data, alloc_bh->b_size);
526
527 alloc = (struct ocfs2_dinode *) alloc_bh->b_data;
528 ocfs2_clear_local_alloc(alloc);
529
530 ocfs2_compute_meta_ecc(osb->sb, alloc_bh->b_data, &alloc->i_check);
531 status = ocfs2_write_block(osb, alloc_bh, INODE_CACHE(inode));
532 if (status < 0)
533 mlog_errno(status);
534
535bail:
536 if (status < 0) {
537 kfree(*alloc_copy);
538 *alloc_copy = NULL;
539 }
540
541 brelse(alloc_bh);
542
543 if (inode) {
544 mutex_unlock(&inode->i_mutex);
545 iput(inode);
546 }
547
548 if (status)
549 mlog_errno(status);
550 return status;
551}
552
553
554
555
556
557
558
559int ocfs2_complete_local_alloc_recovery(struct ocfs2_super *osb,
560 struct ocfs2_dinode *alloc)
561{
562 int status;
563 handle_t *handle;
564 struct buffer_head *main_bm_bh = NULL;
565 struct inode *main_bm_inode;
566
567 main_bm_inode = ocfs2_get_system_file_inode(osb,
568 GLOBAL_BITMAP_SYSTEM_INODE,
569 OCFS2_INVALID_SLOT);
570 if (!main_bm_inode) {
571 status = -EINVAL;
572 mlog_errno(status);
573 goto out;
574 }
575
576 mutex_lock(&main_bm_inode->i_mutex);
577
578 status = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 1);
579 if (status < 0) {
580 mlog_errno(status);
581 goto out_mutex;
582 }
583
584 handle = ocfs2_start_trans(osb, OCFS2_WINDOW_MOVE_CREDITS);
585 if (IS_ERR(handle)) {
586 status = PTR_ERR(handle);
587 handle = NULL;
588 mlog_errno(status);
589 goto out_unlock;
590 }
591
592
593 handle->h_sync = 1;
594
595 status = ocfs2_sync_local_to_main(osb, handle, alloc,
596 main_bm_inode, main_bm_bh);
597 if (status < 0)
598 mlog_errno(status);
599
600 ocfs2_commit_trans(osb, handle);
601
602out_unlock:
603 ocfs2_inode_unlock(main_bm_inode, 1);
604
605out_mutex:
606 mutex_unlock(&main_bm_inode->i_mutex);
607
608 brelse(main_bm_bh);
609
610 iput(main_bm_inode);
611
612out:
613 if (!status)
614 ocfs2_init_steal_slots(osb);
615 if (status)
616 mlog_errno(status);
617 return status;
618}
619
620
621
622
623
624
625
626
627int ocfs2_reserve_local_alloc_bits(struct ocfs2_super *osb,
628 u32 bits_wanted,
629 struct ocfs2_alloc_context *ac)
630{
631 int status;
632 struct ocfs2_dinode *alloc;
633 struct inode *local_alloc_inode;
634 unsigned int free_bits;
635
636 BUG_ON(!ac);
637
638 local_alloc_inode =
639 ocfs2_get_system_file_inode(osb,
640 LOCAL_ALLOC_SYSTEM_INODE,
641 osb->slot_num);
642 if (!local_alloc_inode) {
643 status = -ENOENT;
644 mlog_errno(status);
645 goto bail;
646 }
647
648 mutex_lock(&local_alloc_inode->i_mutex);
649
650
651
652
653
654 spin_lock(&osb->osb_lock);
655 if (!ocfs2_la_state_enabled(osb) ||
656 (bits_wanted > osb->local_alloc_bits)) {
657 spin_unlock(&osb->osb_lock);
658 status = -ENOSPC;
659 goto bail;
660 }
661 spin_unlock(&osb->osb_lock);
662
663 alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
664
665#ifdef CONFIG_OCFS2_DEBUG_FS
666 if (le32_to_cpu(alloc->id1.bitmap1.i_used) !=
667 ocfs2_local_alloc_count_bits(alloc)) {
668 ocfs2_error(osb->sb, "local alloc inode %llu says it has "
669 "%u free bits, but a count shows %u",
670 (unsigned long long)le64_to_cpu(alloc->i_blkno),
671 le32_to_cpu(alloc->id1.bitmap1.i_used),
672 ocfs2_local_alloc_count_bits(alloc));
673 status = -EIO;
674 goto bail;
675 }
676#endif
677
678 free_bits = le32_to_cpu(alloc->id1.bitmap1.i_total) -
679 le32_to_cpu(alloc->id1.bitmap1.i_used);
680 if (bits_wanted > free_bits) {
681
682 status =
683 ocfs2_local_alloc_slide_window(osb, local_alloc_inode);
684 if (status < 0) {
685 if (status != -ENOSPC)
686 mlog_errno(status);
687 goto bail;
688 }
689
690
691
692
693
694
695
696 status = -ENOSPC;
697 if (!ocfs2_la_state_enabled(osb))
698 goto bail;
699
700 free_bits = le32_to_cpu(alloc->id1.bitmap1.i_total) -
701 le32_to_cpu(alloc->id1.bitmap1.i_used);
702 if (bits_wanted > free_bits)
703 goto bail;
704 }
705
706 ac->ac_inode = local_alloc_inode;
707
708 ac->ac_alloc_slot = osb->slot_num;
709 ac->ac_which = OCFS2_AC_USE_LOCAL;
710 get_bh(osb->local_alloc_bh);
711 ac->ac_bh = osb->local_alloc_bh;
712 status = 0;
713bail:
714 if (status < 0 && local_alloc_inode) {
715 mutex_unlock(&local_alloc_inode->i_mutex);
716 iput(local_alloc_inode);
717 }
718
719 trace_ocfs2_reserve_local_alloc_bits(
720 (unsigned long long)ac->ac_max_block,
721 bits_wanted, osb->slot_num, status);
722
723 if (status)
724 mlog_errno(status);
725 return status;
726}
727
728int ocfs2_claim_local_alloc_bits(struct ocfs2_super *osb,
729 handle_t *handle,
730 struct ocfs2_alloc_context *ac,
731 u32 bits_wanted,
732 u32 *bit_off,
733 u32 *num_bits)
734{
735 int status, start;
736 struct inode *local_alloc_inode;
737 void *bitmap;
738 struct ocfs2_dinode *alloc;
739 struct ocfs2_local_alloc *la;
740
741 BUG_ON(ac->ac_which != OCFS2_AC_USE_LOCAL);
742
743 local_alloc_inode = ac->ac_inode;
744 alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
745 la = OCFS2_LOCAL_ALLOC(alloc);
746
747 start = ocfs2_local_alloc_find_clear_bits(osb, alloc, &bits_wanted,
748 ac->ac_resv);
749 if (start == -1) {
750
751 status = -ENOSPC;
752 mlog_errno(status);
753 goto bail;
754 }
755
756 bitmap = la->la_bitmap;
757 *bit_off = le32_to_cpu(la->la_bm_off) + start;
758 *num_bits = bits_wanted;
759
760 status = ocfs2_journal_access_di(handle,
761 INODE_CACHE(local_alloc_inode),
762 osb->local_alloc_bh,
763 OCFS2_JOURNAL_ACCESS_WRITE);
764 if (status < 0) {
765 mlog_errno(status);
766 goto bail;
767 }
768
769 ocfs2_resmap_claimed_bits(&osb->osb_la_resmap, ac->ac_resv, start,
770 bits_wanted);
771
772 while(bits_wanted--)
773 ocfs2_set_bit(start++, bitmap);
774
775 le32_add_cpu(&alloc->id1.bitmap1.i_used, *num_bits);
776 ocfs2_journal_dirty(handle, osb->local_alloc_bh);
777
778bail:
779 if (status)
780 mlog_errno(status);
781 return status;
782}
783
784int ocfs2_free_local_alloc_bits(struct ocfs2_super *osb,
785 handle_t *handle,
786 struct ocfs2_alloc_context *ac,
787 u32 bit_off,
788 u32 num_bits)
789{
790 int status, start;
791 u32 clear_bits;
792 struct inode *local_alloc_inode;
793 void *bitmap;
794 struct ocfs2_dinode *alloc;
795 struct ocfs2_local_alloc *la;
796
797 BUG_ON(ac->ac_which != OCFS2_AC_USE_LOCAL);
798
799 local_alloc_inode = ac->ac_inode;
800 alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
801 la = OCFS2_LOCAL_ALLOC(alloc);
802
803 bitmap = la->la_bitmap;
804 start = bit_off - le32_to_cpu(la->la_bm_off);
805 clear_bits = num_bits;
806
807 status = ocfs2_journal_access_di(handle,
808 INODE_CACHE(local_alloc_inode),
809 osb->local_alloc_bh,
810 OCFS2_JOURNAL_ACCESS_WRITE);
811 if (status < 0) {
812 mlog_errno(status);
813 goto bail;
814 }
815
816 while (clear_bits--)
817 ocfs2_clear_bit(start++, bitmap);
818
819 le32_add_cpu(&alloc->id1.bitmap1.i_used, -num_bits);
820 ocfs2_journal_dirty(handle, osb->local_alloc_bh);
821
822bail:
823 return status;
824}
825
826static u32 ocfs2_local_alloc_count_bits(struct ocfs2_dinode *alloc)
827{
828 u32 count;
829 struct ocfs2_local_alloc *la = OCFS2_LOCAL_ALLOC(alloc);
830
831 count = memweight(la->la_bitmap, le16_to_cpu(la->la_size));
832
833 trace_ocfs2_local_alloc_count_bits(count);
834 return count;
835}
836
837static int ocfs2_local_alloc_find_clear_bits(struct ocfs2_super *osb,
838 struct ocfs2_dinode *alloc,
839 u32 *numbits,
840 struct ocfs2_alloc_reservation *resv)
841{
842 int numfound, bitoff, left, startoff, lastzero;
843 int local_resv = 0;
844 struct ocfs2_alloc_reservation r;
845 void *bitmap = NULL;
846 struct ocfs2_reservation_map *resmap = &osb->osb_la_resmap;
847
848 if (!alloc->id1.bitmap1.i_total) {
849 bitoff = -1;
850 goto bail;
851 }
852
853 if (!resv) {
854 local_resv = 1;
855 ocfs2_resv_init_once(&r);
856 ocfs2_resv_set_type(&r, OCFS2_RESV_FLAG_TMP);
857 resv = &r;
858 }
859
860 numfound = *numbits;
861 if (ocfs2_resmap_resv_bits(resmap, resv, &bitoff, &numfound) == 0) {
862 if (numfound < *numbits)
863 *numbits = numfound;
864 goto bail;
865 }
866
867
868
869
870
871 BUG_ON(osb->osb_resv_level != 0);
872
873
874
875
876
877 bitmap = OCFS2_LOCAL_ALLOC(alloc)->la_bitmap;
878
879 numfound = bitoff = startoff = 0;
880 lastzero = -1;
881 left = le32_to_cpu(alloc->id1.bitmap1.i_total);
882 while ((bitoff = ocfs2_find_next_zero_bit(bitmap, left, startoff)) != -1) {
883 if (bitoff == left) {
884
885 break;
886 }
887
888
889
890
891
892 if (bitoff == startoff) {
893
894 numfound++;
895 startoff++;
896 } else {
897
898 numfound = 1;
899 startoff = bitoff+1;
900 }
901
902 if (numfound == *numbits) {
903
904 break;
905 }
906 }
907
908 trace_ocfs2_local_alloc_find_clear_bits_search_bitmap(bitoff, numfound);
909
910 if (numfound == *numbits)
911 bitoff = startoff - numfound;
912 else
913 bitoff = -1;
914
915bail:
916 if (local_resv)
917 ocfs2_resv_discard(resmap, resv);
918
919 trace_ocfs2_local_alloc_find_clear_bits(*numbits,
920 le32_to_cpu(alloc->id1.bitmap1.i_total),
921 bitoff, numfound);
922
923 return bitoff;
924}
925
926static void ocfs2_clear_local_alloc(struct ocfs2_dinode *alloc)
927{
928 struct ocfs2_local_alloc *la = OCFS2_LOCAL_ALLOC(alloc);
929 int i;
930
931 alloc->id1.bitmap1.i_total = 0;
932 alloc->id1.bitmap1.i_used = 0;
933 la->la_bm_off = 0;
934 for(i = 0; i < le16_to_cpu(la->la_size); i++)
935 la->la_bitmap[i] = 0;
936}
937
938#if 0
939
940static void ocfs2_verify_zero_bits(unsigned long *bitmap,
941 unsigned int start,
942 unsigned int count)
943{
944 unsigned int tmp = count;
945 while(tmp--) {
946 if (ocfs2_test_bit(start + tmp, bitmap)) {
947 printk("ocfs2_verify_zero_bits: start = %u, count = "
948 "%u\n", start, count);
949 printk("ocfs2_verify_zero_bits: bit %u is set!",
950 start + tmp);
951 BUG();
952 }
953 }
954}
955#endif
956
957
958
959
960
961
962
963static int ocfs2_sync_local_to_main(struct ocfs2_super *osb,
964 handle_t *handle,
965 struct ocfs2_dinode *alloc,
966 struct inode *main_bm_inode,
967 struct buffer_head *main_bm_bh)
968{
969 int status = 0;
970 int bit_off, left, count, start;
971 u64 la_start_blk;
972 u64 blkno;
973 void *bitmap;
974 struct ocfs2_local_alloc *la = OCFS2_LOCAL_ALLOC(alloc);
975
976 trace_ocfs2_sync_local_to_main(
977 le32_to_cpu(alloc->id1.bitmap1.i_total),
978 le32_to_cpu(alloc->id1.bitmap1.i_used));
979
980 if (!alloc->id1.bitmap1.i_total) {
981 goto bail;
982 }
983
984 if (le32_to_cpu(alloc->id1.bitmap1.i_used) ==
985 le32_to_cpu(alloc->id1.bitmap1.i_total)) {
986 goto bail;
987 }
988
989 la_start_blk = ocfs2_clusters_to_blocks(osb->sb,
990 le32_to_cpu(la->la_bm_off));
991 bitmap = la->la_bitmap;
992 start = count = bit_off = 0;
993 left = le32_to_cpu(alloc->id1.bitmap1.i_total);
994
995 while ((bit_off = ocfs2_find_next_zero_bit(bitmap, left, start))
996 != -1) {
997 if ((bit_off < left) && (bit_off == start)) {
998 count++;
999 start++;
1000 continue;
1001 }
1002 if (count) {
1003 blkno = la_start_blk +
1004 ocfs2_clusters_to_blocks(osb->sb,
1005 start - count);
1006
1007 trace_ocfs2_sync_local_to_main_free(
1008 count, start - count,
1009 (unsigned long long)la_start_blk,
1010 (unsigned long long)blkno);
1011
1012 status = ocfs2_release_clusters(handle,
1013 main_bm_inode,
1014 main_bm_bh, blkno,
1015 count);
1016 if (status < 0) {
1017 mlog_errno(status);
1018 goto bail;
1019 }
1020 }
1021 if (bit_off >= left)
1022 break;
1023 count = 1;
1024 start = bit_off + 1;
1025 }
1026
1027bail:
1028 if (status)
1029 mlog_errno(status);
1030 return status;
1031}
1032
1033enum ocfs2_la_event {
1034 OCFS2_LA_EVENT_SLIDE,
1035 OCFS2_LA_EVENT_FRAGMENTED,
1036
1037
1038
1039
1040 OCFS2_LA_EVENT_ENOSPC,
1041
1042
1043};
1044#define OCFS2_LA_ENABLE_INTERVAL (30 * HZ)
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055static int ocfs2_recalc_la_window(struct ocfs2_super *osb,
1056 enum ocfs2_la_event event)
1057{
1058 unsigned int bits;
1059 int state;
1060
1061 spin_lock(&osb->osb_lock);
1062 if (osb->local_alloc_state == OCFS2_LA_DISABLED) {
1063 WARN_ON_ONCE(osb->local_alloc_state == OCFS2_LA_DISABLED);
1064 goto out_unlock;
1065 }
1066
1067
1068
1069
1070 if (event == OCFS2_LA_EVENT_ENOSPC ||
1071 event == OCFS2_LA_EVENT_FRAGMENTED) {
1072
1073
1074
1075
1076
1077 bits = osb->local_alloc_bits >> 1;
1078 if (bits > ocfs2_megabytes_to_clusters(osb->sb, 1)) {
1079
1080
1081
1082
1083
1084
1085
1086 osb->local_alloc_state = OCFS2_LA_THROTTLED;
1087 osb->local_alloc_bits = bits;
1088 } else {
1089 osb->local_alloc_state = OCFS2_LA_DISABLED;
1090 }
1091 queue_delayed_work(ocfs2_wq, &osb->la_enable_wq,
1092 OCFS2_LA_ENABLE_INTERVAL);
1093 goto out_unlock;
1094 }
1095
1096
1097
1098
1099
1100
1101
1102 if (osb->local_alloc_state != OCFS2_LA_THROTTLED)
1103 osb->local_alloc_bits = osb->local_alloc_default_bits;
1104
1105out_unlock:
1106 state = osb->local_alloc_state;
1107 spin_unlock(&osb->osb_lock);
1108
1109 return state;
1110}
1111
1112static int ocfs2_local_alloc_reserve_for_window(struct ocfs2_super *osb,
1113 struct ocfs2_alloc_context **ac,
1114 struct inode **bitmap_inode,
1115 struct buffer_head **bitmap_bh)
1116{
1117 int status;
1118
1119 *ac = kzalloc(sizeof(struct ocfs2_alloc_context), GFP_KERNEL);
1120 if (!(*ac)) {
1121 status = -ENOMEM;
1122 mlog_errno(status);
1123 goto bail;
1124 }
1125
1126retry_enospc:
1127 (*ac)->ac_bits_wanted = osb->local_alloc_bits;
1128 status = ocfs2_reserve_cluster_bitmap_bits(osb, *ac);
1129 if (status == -ENOSPC) {
1130 if (ocfs2_recalc_la_window(osb, OCFS2_LA_EVENT_ENOSPC) ==
1131 OCFS2_LA_DISABLED)
1132 goto bail;
1133
1134 ocfs2_free_ac_resource(*ac);
1135 memset(*ac, 0, sizeof(struct ocfs2_alloc_context));
1136 goto retry_enospc;
1137 }
1138 if (status < 0) {
1139 mlog_errno(status);
1140 goto bail;
1141 }
1142
1143 *bitmap_inode = (*ac)->ac_inode;
1144 igrab(*bitmap_inode);
1145 *bitmap_bh = (*ac)->ac_bh;
1146 get_bh(*bitmap_bh);
1147 status = 0;
1148bail:
1149 if ((status < 0) && *ac) {
1150 ocfs2_free_alloc_context(*ac);
1151 *ac = NULL;
1152 }
1153
1154 if (status)
1155 mlog_errno(status);
1156 return status;
1157}
1158
1159
1160
1161
1162static int ocfs2_local_alloc_new_window(struct ocfs2_super *osb,
1163 handle_t *handle,
1164 struct ocfs2_alloc_context *ac)
1165{
1166 int status = 0;
1167 u32 cluster_off, cluster_count;
1168 struct ocfs2_dinode *alloc = NULL;
1169 struct ocfs2_local_alloc *la;
1170
1171 alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
1172 la = OCFS2_LOCAL_ALLOC(alloc);
1173
1174 trace_ocfs2_local_alloc_new_window(
1175 le32_to_cpu(alloc->id1.bitmap1.i_total),
1176 osb->local_alloc_bits);
1177
1178
1179
1180
1181 ac->ac_last_group = osb->la_last_gd;
1182
1183
1184
1185
1186 status = ocfs2_claim_clusters(handle, ac, osb->local_alloc_bits,
1187 &cluster_off, &cluster_count);
1188 if (status == -ENOSPC) {
1189retry_enospc:
1190
1191
1192
1193
1194
1195 if (ocfs2_recalc_la_window(osb, OCFS2_LA_EVENT_FRAGMENTED) ==
1196 OCFS2_LA_DISABLED)
1197 goto bail;
1198
1199 ac->ac_bits_wanted = osb->local_alloc_bits;
1200 status = ocfs2_claim_clusters(handle, ac,
1201 osb->local_alloc_bits,
1202 &cluster_off,
1203 &cluster_count);
1204 if (status == -ENOSPC)
1205 goto retry_enospc;
1206
1207
1208
1209
1210
1211 if (status == 0) {
1212 spin_lock(&osb->osb_lock);
1213 osb->local_alloc_bits = cluster_count;
1214 spin_unlock(&osb->osb_lock);
1215 }
1216 }
1217 if (status < 0) {
1218 if (status != -ENOSPC)
1219 mlog_errno(status);
1220 goto bail;
1221 }
1222
1223 osb->la_last_gd = ac->ac_last_group;
1224
1225 la->la_bm_off = cpu_to_le32(cluster_off);
1226 alloc->id1.bitmap1.i_total = cpu_to_le32(cluster_count);
1227
1228
1229
1230
1231 alloc->id1.bitmap1.i_used = 0;
1232 memset(OCFS2_LOCAL_ALLOC(alloc)->la_bitmap, 0,
1233 le16_to_cpu(la->la_size));
1234
1235 ocfs2_resmap_restart(&osb->osb_la_resmap, cluster_count,
1236 OCFS2_LOCAL_ALLOC(alloc)->la_bitmap);
1237
1238 trace_ocfs2_local_alloc_new_window_result(
1239 OCFS2_LOCAL_ALLOC(alloc)->la_bm_off,
1240 le32_to_cpu(alloc->id1.bitmap1.i_total));
1241
1242bail:
1243 if (status)
1244 mlog_errno(status);
1245 return status;
1246}
1247
1248
1249
1250static int ocfs2_local_alloc_slide_window(struct ocfs2_super *osb,
1251 struct inode *local_alloc_inode)
1252{
1253 int status = 0;
1254 struct buffer_head *main_bm_bh = NULL;
1255 struct inode *main_bm_inode = NULL;
1256 handle_t *handle = NULL;
1257 struct ocfs2_dinode *alloc;
1258 struct ocfs2_dinode *alloc_copy = NULL;
1259 struct ocfs2_alloc_context *ac = NULL;
1260
1261 ocfs2_recalc_la_window(osb, OCFS2_LA_EVENT_SLIDE);
1262
1263
1264 status = ocfs2_local_alloc_reserve_for_window(osb,
1265 &ac,
1266 &main_bm_inode,
1267 &main_bm_bh);
1268 if (status < 0) {
1269 if (status != -ENOSPC)
1270 mlog_errno(status);
1271 goto bail;
1272 }
1273
1274 handle = ocfs2_start_trans(osb, OCFS2_WINDOW_MOVE_CREDITS);
1275 if (IS_ERR(handle)) {
1276 status = PTR_ERR(handle);
1277 handle = NULL;
1278 mlog_errno(status);
1279 goto bail;
1280 }
1281
1282 alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
1283
1284
1285
1286
1287
1288
1289 alloc_copy = kmalloc(osb->local_alloc_bh->b_size, GFP_NOFS);
1290 if (!alloc_copy) {
1291 status = -ENOMEM;
1292 mlog_errno(status);
1293 goto bail;
1294 }
1295 memcpy(alloc_copy, alloc, osb->local_alloc_bh->b_size);
1296
1297 status = ocfs2_journal_access_di(handle,
1298 INODE_CACHE(local_alloc_inode),
1299 osb->local_alloc_bh,
1300 OCFS2_JOURNAL_ACCESS_WRITE);
1301 if (status < 0) {
1302 mlog_errno(status);
1303 goto bail;
1304 }
1305
1306 ocfs2_clear_local_alloc(alloc);
1307 ocfs2_journal_dirty(handle, osb->local_alloc_bh);
1308
1309 status = ocfs2_sync_local_to_main(osb, handle, alloc_copy,
1310 main_bm_inode, main_bm_bh);
1311 if (status < 0) {
1312 mlog_errno(status);
1313 goto bail;
1314 }
1315
1316 status = ocfs2_local_alloc_new_window(osb, handle, ac);
1317 if (status < 0) {
1318 if (status != -ENOSPC)
1319 mlog_errno(status);
1320 goto bail;
1321 }
1322
1323 atomic_inc(&osb->alloc_stats.moves);
1324
1325bail:
1326 if (handle)
1327 ocfs2_commit_trans(osb, handle);
1328
1329 brelse(main_bm_bh);
1330
1331 if (main_bm_inode)
1332 iput(main_bm_inode);
1333
1334 kfree(alloc_copy);
1335
1336 if (ac)
1337 ocfs2_free_alloc_context(ac);
1338
1339 if (status)
1340 mlog_errno(status);
1341 return status;
1342}
1343
1344