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18#include <linux/blkdev.h>
19#include <linux/module.h>
20#include <linux/errno.h>
21#include <linux/slab.h>
22#include <linux/init.h>
23#include <linux/timer.h>
24#include <linux/sched.h>
25#include <linux/list.h>
26#include <linux/file.h>
27#include <linux/mount.h>
28#include <linux/buffer_head.h>
29#include <linux/seq_file.h>
30#include "md.h"
31#include "bitmap.h"
32
33static inline char *bmname(struct bitmap *bitmap)
34{
35 return bitmap->mddev ? mdname(bitmap->mddev) : "mdX";
36}
37
38
39
40
41
42
43
44
45
46
47
48static int bitmap_checkpage(struct bitmap_counts *bitmap,
49 unsigned long page, int create)
50__releases(bitmap->lock)
51__acquires(bitmap->lock)
52{
53 unsigned char *mappage;
54
55 if (page >= bitmap->pages) {
56
57
58
59
60 return -EINVAL;
61 }
62
63 if (bitmap->bp[page].hijacked)
64 return 0;
65
66 if (bitmap->bp[page].map)
67 return 0;
68
69 if (!create)
70 return -ENOENT;
71
72
73
74 spin_unlock_irq(&bitmap->lock);
75
76
77
78
79
80
81
82
83
84
85
86
87 sched_annotate_sleep();
88 mappage = kzalloc(PAGE_SIZE, GFP_NOIO);
89 spin_lock_irq(&bitmap->lock);
90
91 if (mappage == NULL) {
92 pr_debug("md/bitmap: map page allocation failed, hijacking\n");
93
94
95 if (!bitmap->bp[page].map)
96 bitmap->bp[page].hijacked = 1;
97 } else if (bitmap->bp[page].map ||
98 bitmap->bp[page].hijacked) {
99
100 kfree(mappage);
101 return 0;
102 } else {
103
104
105
106 bitmap->bp[page].map = mappage;
107 bitmap->missing_pages--;
108 }
109 return 0;
110}
111
112
113
114
115static void bitmap_checkfree(struct bitmap_counts *bitmap, unsigned long page)
116{
117 char *ptr;
118
119 if (bitmap->bp[page].count)
120 return;
121
122
123
124 if (bitmap->bp[page].hijacked) {
125 bitmap->bp[page].hijacked = 0;
126 bitmap->bp[page].map = NULL;
127 } else {
128
129 ptr = bitmap->bp[page].map;
130 bitmap->bp[page].map = NULL;
131 bitmap->missing_pages++;
132 kfree(ptr);
133 }
134}
135
136
137
138
139
140
141
142
143
144
145static int read_sb_page(struct mddev *mddev, loff_t offset,
146 struct page *page,
147 unsigned long index, int size)
148{
149
150
151 struct md_rdev *rdev;
152 sector_t target;
153
154 rdev_for_each(rdev, mddev) {
155 if (! test_bit(In_sync, &rdev->flags)
156 || test_bit(Faulty, &rdev->flags))
157 continue;
158
159 target = offset + index * (PAGE_SIZE/512);
160
161 if (sync_page_io(rdev, target,
162 roundup(size, bdev_logical_block_size(rdev->bdev)),
163 page, READ, true)) {
164 page->index = index;
165 return 0;
166 }
167 }
168 return -EIO;
169}
170
171static struct md_rdev *next_active_rdev(struct md_rdev *rdev, struct mddev *mddev)
172{
173
174
175
176
177
178
179
180
181
182
183
184
185
186 rcu_read_lock();
187 if (rdev == NULL)
188
189 rdev = list_entry(&mddev->disks, struct md_rdev, same_set);
190 else {
191
192 rdev_dec_pending(rdev, mddev);
193 }
194 list_for_each_entry_continue_rcu(rdev, &mddev->disks, same_set) {
195 if (rdev->raid_disk >= 0 &&
196 !test_bit(Faulty, &rdev->flags)) {
197
198 atomic_inc(&rdev->nr_pending);
199 rcu_read_unlock();
200 return rdev;
201 }
202 }
203 rcu_read_unlock();
204 return NULL;
205}
206
207static int write_sb_page(struct bitmap *bitmap, struct page *page, int wait)
208{
209 struct md_rdev *rdev = NULL;
210 struct block_device *bdev;
211 struct mddev *mddev = bitmap->mddev;
212 struct bitmap_storage *store = &bitmap->storage;
213 int node_offset = 0;
214
215 if (mddev_is_clustered(bitmap->mddev))
216 node_offset = bitmap->cluster_slot * store->file_pages;
217
218 while ((rdev = next_active_rdev(rdev, mddev)) != NULL) {
219 int size = PAGE_SIZE;
220 loff_t offset = mddev->bitmap_info.offset;
221
222 bdev = (rdev->meta_bdev) ? rdev->meta_bdev : rdev->bdev;
223
224 if (page->index == store->file_pages-1) {
225 int last_page_size = store->bytes & (PAGE_SIZE-1);
226 if (last_page_size == 0)
227 last_page_size = PAGE_SIZE;
228 size = roundup(last_page_size,
229 bdev_logical_block_size(bdev));
230 }
231
232
233
234 if (mddev->external) {
235
236 if (rdev->sb_start + offset + (page->index
237 * (PAGE_SIZE/512))
238 > rdev->data_offset
239 &&
240 rdev->sb_start + offset
241 < (rdev->data_offset + mddev->dev_sectors
242 + (PAGE_SIZE/512)))
243 goto bad_alignment;
244 } else if (offset < 0) {
245
246 if (offset
247 + (long)(page->index * (PAGE_SIZE/512))
248 + size/512 > 0)
249
250 goto bad_alignment;
251 if (rdev->data_offset + mddev->dev_sectors
252 > rdev->sb_start + offset)
253
254 goto bad_alignment;
255 } else if (rdev->sb_start < rdev->data_offset) {
256
257 if (rdev->sb_start
258 + offset
259 + page->index*(PAGE_SIZE/512) + size/512
260 > rdev->data_offset)
261
262 goto bad_alignment;
263 } else {
264
265 }
266 md_super_write(mddev, rdev,
267 rdev->sb_start + offset
268 + page->index * (PAGE_SIZE/512),
269 size,
270 page);
271 }
272
273 if (wait)
274 md_super_wait(mddev);
275 return 0;
276
277 bad_alignment:
278 return -EINVAL;
279}
280
281static void bitmap_file_kick(struct bitmap *bitmap);
282
283
284
285static void write_page(struct bitmap *bitmap, struct page *page, int wait)
286{
287 struct buffer_head *bh;
288
289 if (bitmap->storage.file == NULL) {
290 switch (write_sb_page(bitmap, page, wait)) {
291 case -EINVAL:
292 set_bit(BITMAP_WRITE_ERROR, &bitmap->flags);
293 }
294 } else {
295
296 bh = page_buffers(page);
297
298 while (bh && bh->b_blocknr) {
299 atomic_inc(&bitmap->pending_writes);
300 set_buffer_locked(bh);
301 set_buffer_mapped(bh);
302 submit_bh(WRITE | REQ_SYNC, bh);
303 bh = bh->b_this_page;
304 }
305
306 if (wait)
307 wait_event(bitmap->write_wait,
308 atomic_read(&bitmap->pending_writes)==0);
309 }
310 if (test_bit(BITMAP_WRITE_ERROR, &bitmap->flags))
311 bitmap_file_kick(bitmap);
312}
313
314static void end_bitmap_write(struct buffer_head *bh, int uptodate)
315{
316 struct bitmap *bitmap = bh->b_private;
317
318 if (!uptodate)
319 set_bit(BITMAP_WRITE_ERROR, &bitmap->flags);
320 if (atomic_dec_and_test(&bitmap->pending_writes))
321 wake_up(&bitmap->write_wait);
322}
323
324
325static void
326__clear_page_buffers(struct page *page)
327{
328 ClearPagePrivate(page);
329 set_page_private(page, 0);
330 page_cache_release(page);
331}
332static void free_buffers(struct page *page)
333{
334 struct buffer_head *bh;
335
336 if (!PagePrivate(page))
337 return;
338
339 bh = page_buffers(page);
340 while (bh) {
341 struct buffer_head *next = bh->b_this_page;
342 free_buffer_head(bh);
343 bh = next;
344 }
345 __clear_page_buffers(page);
346 put_page(page);
347}
348
349
350
351
352
353
354
355
356static int read_page(struct file *file, unsigned long index,
357 struct bitmap *bitmap,
358 unsigned long count,
359 struct page *page)
360{
361 int ret = 0;
362 struct inode *inode = file_inode(file);
363 struct buffer_head *bh;
364 sector_t block;
365
366 pr_debug("read bitmap file (%dB @ %llu)\n", (int)PAGE_SIZE,
367 (unsigned long long)index << PAGE_SHIFT);
368
369 bh = alloc_page_buffers(page, 1<<inode->i_blkbits, 0);
370 if (!bh) {
371 ret = -ENOMEM;
372 goto out;
373 }
374 attach_page_buffers(page, bh);
375 block = index << (PAGE_SHIFT - inode->i_blkbits);
376 while (bh) {
377 if (count == 0)
378 bh->b_blocknr = 0;
379 else {
380 bh->b_blocknr = bmap(inode, block);
381 if (bh->b_blocknr == 0) {
382
383 ret = -EINVAL;
384 goto out;
385 }
386 bh->b_bdev = inode->i_sb->s_bdev;
387 if (count < (1<<inode->i_blkbits))
388 count = 0;
389 else
390 count -= (1<<inode->i_blkbits);
391
392 bh->b_end_io = end_bitmap_write;
393 bh->b_private = bitmap;
394 atomic_inc(&bitmap->pending_writes);
395 set_buffer_locked(bh);
396 set_buffer_mapped(bh);
397 submit_bh(READ, bh);
398 }
399 block++;
400 bh = bh->b_this_page;
401 }
402 page->index = index;
403
404 wait_event(bitmap->write_wait,
405 atomic_read(&bitmap->pending_writes)==0);
406 if (test_bit(BITMAP_WRITE_ERROR, &bitmap->flags))
407 ret = -EIO;
408out:
409 if (ret)
410 printk(KERN_ALERT "md: bitmap read error: (%dB @ %llu): %d\n",
411 (int)PAGE_SIZE,
412 (unsigned long long)index << PAGE_SHIFT,
413 ret);
414 return ret;
415}
416
417
418
419
420
421
422void bitmap_update_sb(struct bitmap *bitmap)
423{
424 bitmap_super_t *sb;
425
426 if (!bitmap || !bitmap->mddev)
427 return;
428 if (bitmap->mddev->bitmap_info.external)
429 return;
430 if (!bitmap->storage.sb_page)
431 return;
432 sb = kmap_atomic(bitmap->storage.sb_page);
433 sb->events = cpu_to_le64(bitmap->mddev->events);
434 if (bitmap->mddev->events < bitmap->events_cleared)
435
436 bitmap->events_cleared = bitmap->mddev->events;
437 sb->events_cleared = cpu_to_le64(bitmap->events_cleared);
438 sb->state = cpu_to_le32(bitmap->flags);
439
440 sb->daemon_sleep = cpu_to_le32(bitmap->mddev->bitmap_info.daemon_sleep/HZ);
441 sb->write_behind = cpu_to_le32(bitmap->mddev->bitmap_info.max_write_behind);
442
443 sb->sync_size = cpu_to_le64(bitmap->mddev->resync_max_sectors);
444 sb->chunksize = cpu_to_le32(bitmap->mddev->bitmap_info.chunksize);
445 sb->nodes = cpu_to_le32(bitmap->mddev->bitmap_info.nodes);
446 sb->sectors_reserved = cpu_to_le32(bitmap->mddev->
447 bitmap_info.space);
448 kunmap_atomic(sb);
449 write_page(bitmap, bitmap->storage.sb_page, 1);
450}
451
452
453void bitmap_print_sb(struct bitmap *bitmap)
454{
455 bitmap_super_t *sb;
456
457 if (!bitmap || !bitmap->storage.sb_page)
458 return;
459 sb = kmap_atomic(bitmap->storage.sb_page);
460 printk(KERN_DEBUG "%s: bitmap file superblock:\n", bmname(bitmap));
461 printk(KERN_DEBUG " magic: %08x\n", le32_to_cpu(sb->magic));
462 printk(KERN_DEBUG " version: %d\n", le32_to_cpu(sb->version));
463 printk(KERN_DEBUG " uuid: %08x.%08x.%08x.%08x\n",
464 *(__u32 *)(sb->uuid+0),
465 *(__u32 *)(sb->uuid+4),
466 *(__u32 *)(sb->uuid+8),
467 *(__u32 *)(sb->uuid+12));
468 printk(KERN_DEBUG " events: %llu\n",
469 (unsigned long long) le64_to_cpu(sb->events));
470 printk(KERN_DEBUG "events cleared: %llu\n",
471 (unsigned long long) le64_to_cpu(sb->events_cleared));
472 printk(KERN_DEBUG " state: %08x\n", le32_to_cpu(sb->state));
473 printk(KERN_DEBUG " chunksize: %d B\n", le32_to_cpu(sb->chunksize));
474 printk(KERN_DEBUG " daemon sleep: %ds\n", le32_to_cpu(sb->daemon_sleep));
475 printk(KERN_DEBUG " sync size: %llu KB\n",
476 (unsigned long long)le64_to_cpu(sb->sync_size)/2);
477 printk(KERN_DEBUG "max write behind: %d\n", le32_to_cpu(sb->write_behind));
478 kunmap_atomic(sb);
479}
480
481
482
483
484
485
486
487
488
489
490
491
492static int bitmap_new_disk_sb(struct bitmap *bitmap)
493{
494 bitmap_super_t *sb;
495 unsigned long chunksize, daemon_sleep, write_behind;
496
497 bitmap->storage.sb_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
498 if (bitmap->storage.sb_page == NULL)
499 return -ENOMEM;
500 bitmap->storage.sb_page->index = 0;
501
502 sb = kmap_atomic(bitmap->storage.sb_page);
503
504 sb->magic = cpu_to_le32(BITMAP_MAGIC);
505 sb->version = cpu_to_le32(BITMAP_MAJOR_HI);
506
507 chunksize = bitmap->mddev->bitmap_info.chunksize;
508 BUG_ON(!chunksize);
509 if (!is_power_of_2(chunksize)) {
510 kunmap_atomic(sb);
511 printk(KERN_ERR "bitmap chunksize not a power of 2\n");
512 return -EINVAL;
513 }
514 sb->chunksize = cpu_to_le32(chunksize);
515
516 daemon_sleep = bitmap->mddev->bitmap_info.daemon_sleep;
517 if (!daemon_sleep ||
518 (daemon_sleep < 1) || (daemon_sleep > MAX_SCHEDULE_TIMEOUT)) {
519 printk(KERN_INFO "Choosing daemon_sleep default (5 sec)\n");
520 daemon_sleep = 5 * HZ;
521 }
522 sb->daemon_sleep = cpu_to_le32(daemon_sleep);
523 bitmap->mddev->bitmap_info.daemon_sleep = daemon_sleep;
524
525
526
527
528
529 write_behind = bitmap->mddev->bitmap_info.max_write_behind;
530 if (write_behind > COUNTER_MAX)
531 write_behind = COUNTER_MAX / 2;
532 sb->write_behind = cpu_to_le32(write_behind);
533 bitmap->mddev->bitmap_info.max_write_behind = write_behind;
534
535
536 sb->sync_size = cpu_to_le64(bitmap->mddev->resync_max_sectors);
537
538 memcpy(sb->uuid, bitmap->mddev->uuid, 16);
539
540 set_bit(BITMAP_STALE, &bitmap->flags);
541 sb->state = cpu_to_le32(bitmap->flags);
542 bitmap->events_cleared = bitmap->mddev->events;
543 sb->events_cleared = cpu_to_le64(bitmap->mddev->events);
544 bitmap->mddev->bitmap_info.nodes = 0;
545
546 kunmap_atomic(sb);
547
548 return 0;
549}
550
551
552static int bitmap_read_sb(struct bitmap *bitmap)
553{
554 char *reason = NULL;
555 bitmap_super_t *sb;
556 unsigned long chunksize, daemon_sleep, write_behind;
557 unsigned long long events;
558 int nodes = 0;
559 unsigned long sectors_reserved = 0;
560 int err = -EINVAL;
561 struct page *sb_page;
562 loff_t offset = bitmap->mddev->bitmap_info.offset;
563
564 if (!bitmap->storage.file && !bitmap->mddev->bitmap_info.offset) {
565 chunksize = 128 * 1024 * 1024;
566 daemon_sleep = 5 * HZ;
567 write_behind = 0;
568 set_bit(BITMAP_STALE, &bitmap->flags);
569 err = 0;
570 goto out_no_sb;
571 }
572
573 sb_page = alloc_page(GFP_KERNEL);
574 if (!sb_page)
575 return -ENOMEM;
576 bitmap->storage.sb_page = sb_page;
577
578re_read:
579
580 if (bitmap->cluster_slot >= 0) {
581 sector_t bm_blocks = bitmap->mddev->resync_max_sectors;
582
583 sector_div(bm_blocks,
584 bitmap->mddev->bitmap_info.chunksize >> 9);
585
586 bm_blocks = ((bm_blocks+7) >> 3) + sizeof(bitmap_super_t);
587
588 bm_blocks = DIV_ROUND_UP_SECTOR_T(bm_blocks, 4096);
589 offset = bitmap->mddev->bitmap_info.offset + (bitmap->cluster_slot * (bm_blocks << 3));
590 pr_info("%s:%d bm slot: %d offset: %llu\n", __func__, __LINE__,
591 bitmap->cluster_slot, offset);
592 }
593
594 if (bitmap->storage.file) {
595 loff_t isize = i_size_read(bitmap->storage.file->f_mapping->host);
596 int bytes = isize > PAGE_SIZE ? PAGE_SIZE : isize;
597
598 err = read_page(bitmap->storage.file, 0,
599 bitmap, bytes, sb_page);
600 } else {
601 err = read_sb_page(bitmap->mddev,
602 offset,
603 sb_page,
604 0, sizeof(bitmap_super_t));
605 }
606 if (err)
607 return err;
608
609 err = -EINVAL;
610 sb = kmap_atomic(sb_page);
611
612 chunksize = le32_to_cpu(sb->chunksize);
613 daemon_sleep = le32_to_cpu(sb->daemon_sleep) * HZ;
614 write_behind = le32_to_cpu(sb->write_behind);
615 sectors_reserved = le32_to_cpu(sb->sectors_reserved);
616
617
618
619
620
621 if (!bitmap->mddev->sync_super) {
622 nodes = le32_to_cpu(sb->nodes);
623 strlcpy(bitmap->mddev->bitmap_info.cluster_name,
624 sb->cluster_name, 64);
625 }
626
627
628 if (sb->magic != cpu_to_le32(BITMAP_MAGIC))
629 reason = "bad magic";
630 else if (le32_to_cpu(sb->version) < BITMAP_MAJOR_LO ||
631 le32_to_cpu(sb->version) > BITMAP_MAJOR_HI)
632 reason = "unrecognized superblock version";
633 else if (chunksize < 512)
634 reason = "bitmap chunksize too small";
635 else if (!is_power_of_2(chunksize))
636 reason = "bitmap chunksize not a power of 2";
637 else if (daemon_sleep < 1 || daemon_sleep > MAX_SCHEDULE_TIMEOUT)
638 reason = "daemon sleep period out of range";
639 else if (write_behind > COUNTER_MAX)
640 reason = "write-behind limit out of range (0 - 16383)";
641 if (reason) {
642 printk(KERN_INFO "%s: invalid bitmap file superblock: %s\n",
643 bmname(bitmap), reason);
644 goto out;
645 }
646
647
648 sb->sync_size = cpu_to_le64(bitmap->mddev->resync_max_sectors);
649
650 if (bitmap->mddev->persistent) {
651
652
653
654
655 if (memcmp(sb->uuid, bitmap->mddev->uuid, 16)) {
656 printk(KERN_INFO
657 "%s: bitmap superblock UUID mismatch\n",
658 bmname(bitmap));
659 goto out;
660 }
661 events = le64_to_cpu(sb->events);
662 if (!nodes && (events < bitmap->mddev->events)) {
663 printk(KERN_INFO
664 "%s: bitmap file is out of date (%llu < %llu) "
665 "-- forcing full recovery\n",
666 bmname(bitmap), events,
667 (unsigned long long) bitmap->mddev->events);
668 set_bit(BITMAP_STALE, &bitmap->flags);
669 }
670 }
671
672
673 bitmap->flags |= le32_to_cpu(sb->state);
674 if (le32_to_cpu(sb->version) == BITMAP_MAJOR_HOSTENDIAN)
675 set_bit(BITMAP_HOSTENDIAN, &bitmap->flags);
676 bitmap->events_cleared = le64_to_cpu(sb->events_cleared);
677 strlcpy(bitmap->mddev->bitmap_info.cluster_name, sb->cluster_name, 64);
678 err = 0;
679
680out:
681 kunmap_atomic(sb);
682
683 bitmap->mddev->bitmap_info.chunksize = chunksize;
684 if (err == 0 && nodes && (bitmap->cluster_slot < 0)) {
685 err = md_setup_cluster(bitmap->mddev, nodes);
686 if (err) {
687 pr_err("%s: Could not setup cluster service (%d)\n",
688 bmname(bitmap), err);
689 goto out_no_sb;
690 }
691 bitmap->cluster_slot = md_cluster_ops->slot_number(bitmap->mddev);
692 goto re_read;
693 }
694
695
696out_no_sb:
697 if (test_bit(BITMAP_STALE, &bitmap->flags))
698 bitmap->events_cleared = bitmap->mddev->events;
699 bitmap->mddev->bitmap_info.chunksize = chunksize;
700 bitmap->mddev->bitmap_info.daemon_sleep = daemon_sleep;
701 bitmap->mddev->bitmap_info.max_write_behind = write_behind;
702 bitmap->mddev->bitmap_info.nodes = nodes;
703 if (bitmap->mddev->bitmap_info.space == 0 ||
704 bitmap->mddev->bitmap_info.space > sectors_reserved)
705 bitmap->mddev->bitmap_info.space = sectors_reserved;
706 if (err) {
707 bitmap_print_sb(bitmap);
708 if (bitmap->cluster_slot < 0)
709 md_cluster_stop(bitmap->mddev);
710 }
711 return err;
712}
713
714
715
716
717
718
719
720
721
722
723
724
725static inline unsigned long file_page_index(struct bitmap_storage *store,
726 unsigned long chunk)
727{
728 if (store->sb_page)
729 chunk += sizeof(bitmap_super_t) << 3;
730 return chunk >> PAGE_BIT_SHIFT;
731}
732
733
734static inline unsigned long file_page_offset(struct bitmap_storage *store,
735 unsigned long chunk)
736{
737 if (store->sb_page)
738 chunk += sizeof(bitmap_super_t) << 3;
739 return chunk & (PAGE_BITS - 1);
740}
741
742
743
744
745
746static inline struct page *filemap_get_page(struct bitmap_storage *store,
747 unsigned long chunk)
748{
749 if (file_page_index(store, chunk) >= store->file_pages)
750 return NULL;
751 return store->filemap[file_page_index(store, chunk)];
752}
753
754static int bitmap_storage_alloc(struct bitmap_storage *store,
755 unsigned long chunks, int with_super,
756 int slot_number)
757{
758 int pnum, offset = 0;
759 unsigned long num_pages;
760 unsigned long bytes;
761
762 bytes = DIV_ROUND_UP(chunks, 8);
763 if (with_super)
764 bytes += sizeof(bitmap_super_t);
765
766 num_pages = DIV_ROUND_UP(bytes, PAGE_SIZE);
767 offset = slot_number * (num_pages - 1);
768
769 store->filemap = kmalloc(sizeof(struct page *)
770 * num_pages, GFP_KERNEL);
771 if (!store->filemap)
772 return -ENOMEM;
773
774 if (with_super && !store->sb_page) {
775 store->sb_page = alloc_page(GFP_KERNEL|__GFP_ZERO);
776 if (store->sb_page == NULL)
777 return -ENOMEM;
778 }
779
780 pnum = 0;
781 if (store->sb_page) {
782 store->filemap[0] = store->sb_page;
783 pnum = 1;
784 store->sb_page->index = offset;
785 }
786
787 for ( ; pnum < num_pages; pnum++) {
788 store->filemap[pnum] = alloc_page(GFP_KERNEL|__GFP_ZERO);
789 if (!store->filemap[pnum]) {
790 store->file_pages = pnum;
791 return -ENOMEM;
792 }
793 store->filemap[pnum]->index = pnum + offset;
794 }
795 store->file_pages = pnum;
796
797
798
799 store->filemap_attr = kzalloc(
800 roundup(DIV_ROUND_UP(num_pages*4, 8), sizeof(unsigned long)),
801 GFP_KERNEL);
802 if (!store->filemap_attr)
803 return -ENOMEM;
804
805 store->bytes = bytes;
806
807 return 0;
808}
809
810static void bitmap_file_unmap(struct bitmap_storage *store)
811{
812 struct page **map, *sb_page;
813 int pages;
814 struct file *file;
815
816 file = store->file;
817 map = store->filemap;
818 pages = store->file_pages;
819 sb_page = store->sb_page;
820
821 while (pages--)
822 if (map[pages] != sb_page)
823 free_buffers(map[pages]);
824 kfree(map);
825 kfree(store->filemap_attr);
826
827 if (sb_page)
828 free_buffers(sb_page);
829
830 if (file) {
831 struct inode *inode = file_inode(file);
832 invalidate_mapping_pages(inode->i_mapping, 0, -1);
833 fput(file);
834 }
835}
836
837
838
839
840
841
842static void bitmap_file_kick(struct bitmap *bitmap)
843{
844 char *path, *ptr = NULL;
845
846 if (!test_and_set_bit(BITMAP_STALE, &bitmap->flags)) {
847 bitmap_update_sb(bitmap);
848
849 if (bitmap->storage.file) {
850 path = kmalloc(PAGE_SIZE, GFP_KERNEL);
851 if (path)
852 ptr = file_path(bitmap->storage.file,
853 path, PAGE_SIZE);
854
855 printk(KERN_ALERT
856 "%s: kicking failed bitmap file %s from array!\n",
857 bmname(bitmap), IS_ERR(ptr) ? "" : ptr);
858
859 kfree(path);
860 } else
861 printk(KERN_ALERT
862 "%s: disabling internal bitmap due to errors\n",
863 bmname(bitmap));
864 }
865}
866
867enum bitmap_page_attr {
868 BITMAP_PAGE_DIRTY = 0,
869 BITMAP_PAGE_PENDING = 1,
870
871 BITMAP_PAGE_NEEDWRITE = 2,
872};
873
874static inline void set_page_attr(struct bitmap *bitmap, int pnum,
875 enum bitmap_page_attr attr)
876{
877 set_bit((pnum<<2) + attr, bitmap->storage.filemap_attr);
878}
879
880static inline void clear_page_attr(struct bitmap *bitmap, int pnum,
881 enum bitmap_page_attr attr)
882{
883 clear_bit((pnum<<2) + attr, bitmap->storage.filemap_attr);
884}
885
886static inline int test_page_attr(struct bitmap *bitmap, int pnum,
887 enum bitmap_page_attr attr)
888{
889 return test_bit((pnum<<2) + attr, bitmap->storage.filemap_attr);
890}
891
892static inline int test_and_clear_page_attr(struct bitmap *bitmap, int pnum,
893 enum bitmap_page_attr attr)
894{
895 return test_and_clear_bit((pnum<<2) + attr,
896 bitmap->storage.filemap_attr);
897}
898
899
900
901
902
903
904
905static void bitmap_file_set_bit(struct bitmap *bitmap, sector_t block)
906{
907 unsigned long bit;
908 struct page *page;
909 void *kaddr;
910 unsigned long chunk = block >> bitmap->counts.chunkshift;
911
912 page = filemap_get_page(&bitmap->storage, chunk);
913 if (!page)
914 return;
915 bit = file_page_offset(&bitmap->storage, chunk);
916
917
918 kaddr = kmap_atomic(page);
919 if (test_bit(BITMAP_HOSTENDIAN, &bitmap->flags))
920 set_bit(bit, kaddr);
921 else
922 set_bit_le(bit, kaddr);
923 kunmap_atomic(kaddr);
924 pr_debug("set file bit %lu page %lu\n", bit, page->index);
925
926 set_page_attr(bitmap, page->index, BITMAP_PAGE_DIRTY);
927}
928
929static void bitmap_file_clear_bit(struct bitmap *bitmap, sector_t block)
930{
931 unsigned long bit;
932 struct page *page;
933 void *paddr;
934 unsigned long chunk = block >> bitmap->counts.chunkshift;
935
936 page = filemap_get_page(&bitmap->storage, chunk);
937 if (!page)
938 return;
939 bit = file_page_offset(&bitmap->storage, chunk);
940 paddr = kmap_atomic(page);
941 if (test_bit(BITMAP_HOSTENDIAN, &bitmap->flags))
942 clear_bit(bit, paddr);
943 else
944 clear_bit_le(bit, paddr);
945 kunmap_atomic(paddr);
946 if (!test_page_attr(bitmap, page->index, BITMAP_PAGE_NEEDWRITE)) {
947 set_page_attr(bitmap, page->index, BITMAP_PAGE_PENDING);
948 bitmap->allclean = 0;
949 }
950}
951
952static int bitmap_file_test_bit(struct bitmap *bitmap, sector_t block)
953{
954 unsigned long bit;
955 struct page *page;
956 void *paddr;
957 unsigned long chunk = block >> bitmap->counts.chunkshift;
958 int set = 0;
959
960 page = filemap_get_page(&bitmap->storage, chunk);
961 if (!page)
962 return -EINVAL;
963 bit = file_page_offset(&bitmap->storage, chunk);
964 paddr = kmap_atomic(page);
965 if (test_bit(BITMAP_HOSTENDIAN, &bitmap->flags))
966 set = test_bit(bit, paddr);
967 else
968 set = test_bit_le(bit, paddr);
969 kunmap_atomic(paddr);
970 return set;
971}
972
973
974
975
976
977void bitmap_unplug(struct bitmap *bitmap)
978{
979 unsigned long i;
980 int dirty, need_write;
981
982 if (!bitmap || !bitmap->storage.filemap ||
983 test_bit(BITMAP_STALE, &bitmap->flags))
984 return;
985
986
987
988 for (i = 0; i < bitmap->storage.file_pages; i++) {
989 if (!bitmap->storage.filemap)
990 return;
991 dirty = test_and_clear_page_attr(bitmap, i, BITMAP_PAGE_DIRTY);
992 need_write = test_and_clear_page_attr(bitmap, i,
993 BITMAP_PAGE_NEEDWRITE);
994 if (dirty || need_write) {
995 clear_page_attr(bitmap, i, BITMAP_PAGE_PENDING);
996 write_page(bitmap, bitmap->storage.filemap[i], 0);
997 }
998 }
999 if (bitmap->storage.file)
1000 wait_event(bitmap->write_wait,
1001 atomic_read(&bitmap->pending_writes)==0);
1002 else
1003 md_super_wait(bitmap->mddev);
1004
1005 if (test_bit(BITMAP_WRITE_ERROR, &bitmap->flags))
1006 bitmap_file_kick(bitmap);
1007}
1008EXPORT_SYMBOL(bitmap_unplug);
1009
1010static void bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset, int needed);
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022static int bitmap_init_from_disk(struct bitmap *bitmap, sector_t start)
1023{
1024 unsigned long i, chunks, index, oldindex, bit, node_offset = 0;
1025 struct page *page = NULL;
1026 unsigned long bit_cnt = 0;
1027 struct file *file;
1028 unsigned long offset;
1029 int outofdate;
1030 int ret = -ENOSPC;
1031 void *paddr;
1032 struct bitmap_storage *store = &bitmap->storage;
1033
1034 chunks = bitmap->counts.chunks;
1035 file = store->file;
1036
1037 if (!file && !bitmap->mddev->bitmap_info.offset) {
1038
1039 store->filemap = NULL;
1040 store->file_pages = 0;
1041 for (i = 0; i < chunks ; i++) {
1042
1043 int needed = ((sector_t)(i+1) << (bitmap->counts.chunkshift)
1044 >= start);
1045 bitmap_set_memory_bits(bitmap,
1046 (sector_t)i << bitmap->counts.chunkshift,
1047 needed);
1048 }
1049 return 0;
1050 }
1051
1052 outofdate = test_bit(BITMAP_STALE, &bitmap->flags);
1053 if (outofdate)
1054 printk(KERN_INFO "%s: bitmap file is out of date, doing full "
1055 "recovery\n", bmname(bitmap));
1056
1057 if (file && i_size_read(file->f_mapping->host) < store->bytes) {
1058 printk(KERN_INFO "%s: bitmap file too short %lu < %lu\n",
1059 bmname(bitmap),
1060 (unsigned long) i_size_read(file->f_mapping->host),
1061 store->bytes);
1062 goto err;
1063 }
1064
1065 oldindex = ~0L;
1066 offset = 0;
1067 if (!bitmap->mddev->bitmap_info.external)
1068 offset = sizeof(bitmap_super_t);
1069
1070 if (mddev_is_clustered(bitmap->mddev))
1071 node_offset = bitmap->cluster_slot * (DIV_ROUND_UP(store->bytes, PAGE_SIZE));
1072
1073 for (i = 0; i < chunks; i++) {
1074 int b;
1075 index = file_page_index(&bitmap->storage, i);
1076 bit = file_page_offset(&bitmap->storage, i);
1077 if (index != oldindex) {
1078 int count;
1079
1080 if (index == store->file_pages-1)
1081 count = store->bytes - index * PAGE_SIZE;
1082 else
1083 count = PAGE_SIZE;
1084 page = store->filemap[index];
1085 if (file)
1086 ret = read_page(file, index, bitmap,
1087 count, page);
1088 else
1089 ret = read_sb_page(
1090 bitmap->mddev,
1091 bitmap->mddev->bitmap_info.offset,
1092 page,
1093 index + node_offset, count);
1094
1095 if (ret)
1096 goto err;
1097
1098 oldindex = index;
1099
1100 if (outofdate) {
1101
1102
1103
1104
1105 paddr = kmap_atomic(page);
1106 memset(paddr + offset, 0xff,
1107 PAGE_SIZE - offset);
1108 kunmap_atomic(paddr);
1109 write_page(bitmap, page, 1);
1110
1111 ret = -EIO;
1112 if (test_bit(BITMAP_WRITE_ERROR,
1113 &bitmap->flags))
1114 goto err;
1115 }
1116 }
1117 paddr = kmap_atomic(page);
1118 if (test_bit(BITMAP_HOSTENDIAN, &bitmap->flags))
1119 b = test_bit(bit, paddr);
1120 else
1121 b = test_bit_le(bit, paddr);
1122 kunmap_atomic(paddr);
1123 if (b) {
1124
1125 int needed = ((sector_t)(i+1) << bitmap->counts.chunkshift
1126 >= start);
1127 bitmap_set_memory_bits(bitmap,
1128 (sector_t)i << bitmap->counts.chunkshift,
1129 needed);
1130 bit_cnt++;
1131 }
1132 offset = 0;
1133 }
1134
1135 printk(KERN_INFO "%s: bitmap initialized from disk: "
1136 "read %lu pages, set %lu of %lu bits\n",
1137 bmname(bitmap), store->file_pages,
1138 bit_cnt, chunks);
1139
1140 return 0;
1141
1142 err:
1143 printk(KERN_INFO "%s: bitmap initialisation failed: %d\n",
1144 bmname(bitmap), ret);
1145 return ret;
1146}
1147
1148void bitmap_write_all(struct bitmap *bitmap)
1149{
1150
1151
1152
1153 int i;
1154
1155 if (!bitmap || !bitmap->storage.filemap)
1156 return;
1157 if (bitmap->storage.file)
1158
1159 return;
1160
1161 for (i = 0; i < bitmap->storage.file_pages; i++)
1162 set_page_attr(bitmap, i,
1163 BITMAP_PAGE_NEEDWRITE);
1164 bitmap->allclean = 0;
1165}
1166
1167static void bitmap_count_page(struct bitmap_counts *bitmap,
1168 sector_t offset, int inc)
1169{
1170 sector_t chunk = offset >> bitmap->chunkshift;
1171 unsigned long page = chunk >> PAGE_COUNTER_SHIFT;
1172 bitmap->bp[page].count += inc;
1173 bitmap_checkfree(bitmap, page);
1174}
1175
1176static void bitmap_set_pending(struct bitmap_counts *bitmap, sector_t offset)
1177{
1178 sector_t chunk = offset >> bitmap->chunkshift;
1179 unsigned long page = chunk >> PAGE_COUNTER_SHIFT;
1180 struct bitmap_page *bp = &bitmap->bp[page];
1181
1182 if (!bp->pending)
1183 bp->pending = 1;
1184}
1185
1186static bitmap_counter_t *bitmap_get_counter(struct bitmap_counts *bitmap,
1187 sector_t offset, sector_t *blocks,
1188 int create);
1189
1190
1191
1192
1193
1194
1195void bitmap_daemon_work(struct mddev *mddev)
1196{
1197 struct bitmap *bitmap;
1198 unsigned long j;
1199 unsigned long nextpage;
1200 sector_t blocks;
1201 struct bitmap_counts *counts;
1202
1203
1204
1205
1206 mutex_lock(&mddev->bitmap_info.mutex);
1207 bitmap = mddev->bitmap;
1208 if (bitmap == NULL) {
1209 mutex_unlock(&mddev->bitmap_info.mutex);
1210 return;
1211 }
1212 if (time_before(jiffies, bitmap->daemon_lastrun
1213 + mddev->bitmap_info.daemon_sleep))
1214 goto done;
1215
1216 bitmap->daemon_lastrun = jiffies;
1217 if (bitmap->allclean) {
1218 mddev->thread->timeout = MAX_SCHEDULE_TIMEOUT;
1219 goto done;
1220 }
1221 bitmap->allclean = 1;
1222
1223
1224
1225
1226
1227 for (j = 0; j < bitmap->storage.file_pages; j++)
1228 if (test_and_clear_page_attr(bitmap, j,
1229 BITMAP_PAGE_PENDING))
1230 set_page_attr(bitmap, j,
1231 BITMAP_PAGE_NEEDWRITE);
1232
1233 if (bitmap->need_sync &&
1234 mddev->bitmap_info.external == 0) {
1235
1236
1237 bitmap_super_t *sb;
1238 bitmap->need_sync = 0;
1239 if (bitmap->storage.filemap) {
1240 sb = kmap_atomic(bitmap->storage.sb_page);
1241 sb->events_cleared =
1242 cpu_to_le64(bitmap->events_cleared);
1243 kunmap_atomic(sb);
1244 set_page_attr(bitmap, 0,
1245 BITMAP_PAGE_NEEDWRITE);
1246 }
1247 }
1248
1249
1250
1251 counts = &bitmap->counts;
1252 spin_lock_irq(&counts->lock);
1253 nextpage = 0;
1254 for (j = 0; j < counts->chunks; j++) {
1255 bitmap_counter_t *bmc;
1256 sector_t block = (sector_t)j << counts->chunkshift;
1257
1258 if (j == nextpage) {
1259 nextpage += PAGE_COUNTER_RATIO;
1260 if (!counts->bp[j >> PAGE_COUNTER_SHIFT].pending) {
1261 j |= PAGE_COUNTER_MASK;
1262 continue;
1263 }
1264 counts->bp[j >> PAGE_COUNTER_SHIFT].pending = 0;
1265 }
1266 bmc = bitmap_get_counter(counts,
1267 block,
1268 &blocks, 0);
1269
1270 if (!bmc) {
1271 j |= PAGE_COUNTER_MASK;
1272 continue;
1273 }
1274 if (*bmc == 1 && !bitmap->need_sync) {
1275
1276 *bmc = 0;
1277 bitmap_count_page(counts, block, -1);
1278 bitmap_file_clear_bit(bitmap, block);
1279 } else if (*bmc && *bmc <= 2) {
1280 *bmc = 1;
1281 bitmap_set_pending(counts, block);
1282 bitmap->allclean = 0;
1283 }
1284 }
1285 spin_unlock_irq(&counts->lock);
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295 for (j = 0;
1296 j < bitmap->storage.file_pages
1297 && !test_bit(BITMAP_STALE, &bitmap->flags);
1298 j++) {
1299 if (test_page_attr(bitmap, j,
1300 BITMAP_PAGE_DIRTY))
1301
1302 break;
1303 if (test_and_clear_page_attr(bitmap, j,
1304 BITMAP_PAGE_NEEDWRITE)) {
1305 write_page(bitmap, bitmap->storage.filemap[j], 0);
1306 }
1307 }
1308
1309 done:
1310 if (bitmap->allclean == 0)
1311 mddev->thread->timeout =
1312 mddev->bitmap_info.daemon_sleep;
1313 mutex_unlock(&mddev->bitmap_info.mutex);
1314}
1315
1316static bitmap_counter_t *bitmap_get_counter(struct bitmap_counts *bitmap,
1317 sector_t offset, sector_t *blocks,
1318 int create)
1319__releases(bitmap->lock)
1320__acquires(bitmap->lock)
1321{
1322
1323
1324
1325
1326 sector_t chunk = offset >> bitmap->chunkshift;
1327 unsigned long page = chunk >> PAGE_COUNTER_SHIFT;
1328 unsigned long pageoff = (chunk & PAGE_COUNTER_MASK) << COUNTER_BYTE_SHIFT;
1329 sector_t csize;
1330 int err;
1331
1332 err = bitmap_checkpage(bitmap, page, create);
1333
1334 if (bitmap->bp[page].hijacked ||
1335 bitmap->bp[page].map == NULL)
1336 csize = ((sector_t)1) << (bitmap->chunkshift +
1337 PAGE_COUNTER_SHIFT - 1);
1338 else
1339 csize = ((sector_t)1) << bitmap->chunkshift;
1340 *blocks = csize - (offset & (csize - 1));
1341
1342 if (err < 0)
1343 return NULL;
1344
1345
1346
1347 if (bitmap->bp[page].hijacked) {
1348
1349
1350 int hi = (pageoff > PAGE_COUNTER_MASK);
1351 return &((bitmap_counter_t *)
1352 &bitmap->bp[page].map)[hi];
1353 } else
1354 return (bitmap_counter_t *)
1355 &(bitmap->bp[page].map[pageoff]);
1356}
1357
1358int bitmap_startwrite(struct bitmap *bitmap, sector_t offset, unsigned long sectors, int behind)
1359{
1360 if (!bitmap)
1361 return 0;
1362
1363 if (behind) {
1364 int bw;
1365 atomic_inc(&bitmap->behind_writes);
1366 bw = atomic_read(&bitmap->behind_writes);
1367 if (bw > bitmap->behind_writes_used)
1368 bitmap->behind_writes_used = bw;
1369
1370 pr_debug("inc write-behind count %d/%lu\n",
1371 bw, bitmap->mddev->bitmap_info.max_write_behind);
1372 }
1373
1374 while (sectors) {
1375 sector_t blocks;
1376 bitmap_counter_t *bmc;
1377
1378 spin_lock_irq(&bitmap->counts.lock);
1379 bmc = bitmap_get_counter(&bitmap->counts, offset, &blocks, 1);
1380 if (!bmc) {
1381 spin_unlock_irq(&bitmap->counts.lock);
1382 return 0;
1383 }
1384
1385 if (unlikely(COUNTER(*bmc) == COUNTER_MAX)) {
1386 DEFINE_WAIT(__wait);
1387
1388
1389
1390
1391 prepare_to_wait(&bitmap->overflow_wait, &__wait,
1392 TASK_UNINTERRUPTIBLE);
1393 spin_unlock_irq(&bitmap->counts.lock);
1394 schedule();
1395 finish_wait(&bitmap->overflow_wait, &__wait);
1396 continue;
1397 }
1398
1399 switch (*bmc) {
1400 case 0:
1401 bitmap_file_set_bit(bitmap, offset);
1402 bitmap_count_page(&bitmap->counts, offset, 1);
1403
1404 case 1:
1405 *bmc = 2;
1406 }
1407
1408 (*bmc)++;
1409
1410 spin_unlock_irq(&bitmap->counts.lock);
1411
1412 offset += blocks;
1413 if (sectors > blocks)
1414 sectors -= blocks;
1415 else
1416 sectors = 0;
1417 }
1418 return 0;
1419}
1420EXPORT_SYMBOL(bitmap_startwrite);
1421
1422void bitmap_endwrite(struct bitmap *bitmap, sector_t offset, unsigned long sectors,
1423 int success, int behind)
1424{
1425 if (!bitmap)
1426 return;
1427 if (behind) {
1428 if (atomic_dec_and_test(&bitmap->behind_writes))
1429 wake_up(&bitmap->behind_wait);
1430 pr_debug("dec write-behind count %d/%lu\n",
1431 atomic_read(&bitmap->behind_writes),
1432 bitmap->mddev->bitmap_info.max_write_behind);
1433 }
1434
1435 while (sectors) {
1436 sector_t blocks;
1437 unsigned long flags;
1438 bitmap_counter_t *bmc;
1439
1440 spin_lock_irqsave(&bitmap->counts.lock, flags);
1441 bmc = bitmap_get_counter(&bitmap->counts, offset, &blocks, 0);
1442 if (!bmc) {
1443 spin_unlock_irqrestore(&bitmap->counts.lock, flags);
1444 return;
1445 }
1446
1447 if (success && !bitmap->mddev->degraded &&
1448 bitmap->events_cleared < bitmap->mddev->events) {
1449 bitmap->events_cleared = bitmap->mddev->events;
1450 bitmap->need_sync = 1;
1451 sysfs_notify_dirent_safe(bitmap->sysfs_can_clear);
1452 }
1453
1454 if (!success && !NEEDED(*bmc))
1455 *bmc |= NEEDED_MASK;
1456
1457 if (COUNTER(*bmc) == COUNTER_MAX)
1458 wake_up(&bitmap->overflow_wait);
1459
1460 (*bmc)--;
1461 if (*bmc <= 2) {
1462 bitmap_set_pending(&bitmap->counts, offset);
1463 bitmap->allclean = 0;
1464 }
1465 spin_unlock_irqrestore(&bitmap->counts.lock, flags);
1466 offset += blocks;
1467 if (sectors > blocks)
1468 sectors -= blocks;
1469 else
1470 sectors = 0;
1471 }
1472}
1473EXPORT_SYMBOL(bitmap_endwrite);
1474
1475static int __bitmap_start_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks,
1476 int degraded)
1477{
1478 bitmap_counter_t *bmc;
1479 int rv;
1480 if (bitmap == NULL) {
1481 *blocks = 1024;
1482 return 1;
1483 }
1484 spin_lock_irq(&bitmap->counts.lock);
1485 bmc = bitmap_get_counter(&bitmap->counts, offset, blocks, 0);
1486 rv = 0;
1487 if (bmc) {
1488
1489 if (RESYNC(*bmc))
1490 rv = 1;
1491 else if (NEEDED(*bmc)) {
1492 rv = 1;
1493 if (!degraded) {
1494 *bmc |= RESYNC_MASK;
1495 *bmc &= ~NEEDED_MASK;
1496 }
1497 }
1498 }
1499 spin_unlock_irq(&bitmap->counts.lock);
1500 return rv;
1501}
1502
1503int bitmap_start_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks,
1504 int degraded)
1505{
1506
1507
1508
1509
1510
1511
1512
1513 int rv = 0;
1514 sector_t blocks1;
1515
1516 *blocks = 0;
1517 while (*blocks < (PAGE_SIZE>>9)) {
1518 rv |= __bitmap_start_sync(bitmap, offset,
1519 &blocks1, degraded);
1520 offset += blocks1;
1521 *blocks += blocks1;
1522 }
1523 return rv;
1524}
1525EXPORT_SYMBOL(bitmap_start_sync);
1526
1527void bitmap_end_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks, int aborted)
1528{
1529 bitmap_counter_t *bmc;
1530 unsigned long flags;
1531
1532 if (bitmap == NULL) {
1533 *blocks = 1024;
1534 return;
1535 }
1536 spin_lock_irqsave(&bitmap->counts.lock, flags);
1537 bmc = bitmap_get_counter(&bitmap->counts, offset, blocks, 0);
1538 if (bmc == NULL)
1539 goto unlock;
1540
1541 if (RESYNC(*bmc)) {
1542 *bmc &= ~RESYNC_MASK;
1543
1544 if (!NEEDED(*bmc) && aborted)
1545 *bmc |= NEEDED_MASK;
1546 else {
1547 if (*bmc <= 2) {
1548 bitmap_set_pending(&bitmap->counts, offset);
1549 bitmap->allclean = 0;
1550 }
1551 }
1552 }
1553 unlock:
1554 spin_unlock_irqrestore(&bitmap->counts.lock, flags);
1555}
1556EXPORT_SYMBOL(bitmap_end_sync);
1557
1558void bitmap_close_sync(struct bitmap *bitmap)
1559{
1560
1561
1562
1563
1564 sector_t sector = 0;
1565 sector_t blocks;
1566 if (!bitmap)
1567 return;
1568 while (sector < bitmap->mddev->resync_max_sectors) {
1569 bitmap_end_sync(bitmap, sector, &blocks, 0);
1570 sector += blocks;
1571 }
1572}
1573EXPORT_SYMBOL(bitmap_close_sync);
1574
1575void bitmap_cond_end_sync(struct bitmap *bitmap, sector_t sector)
1576{
1577 sector_t s = 0;
1578 sector_t blocks;
1579
1580 if (!bitmap)
1581 return;
1582 if (sector == 0) {
1583 bitmap->last_end_sync = jiffies;
1584 return;
1585 }
1586 if (time_before(jiffies, (bitmap->last_end_sync
1587 + bitmap->mddev->bitmap_info.daemon_sleep)))
1588 return;
1589 wait_event(bitmap->mddev->recovery_wait,
1590 atomic_read(&bitmap->mddev->recovery_active) == 0);
1591
1592 bitmap->mddev->curr_resync_completed = sector;
1593 set_bit(MD_CHANGE_CLEAN, &bitmap->mddev->flags);
1594 sector &= ~((1ULL << bitmap->counts.chunkshift) - 1);
1595 s = 0;
1596 while (s < sector && s < bitmap->mddev->resync_max_sectors) {
1597 bitmap_end_sync(bitmap, s, &blocks, 0);
1598 s += blocks;
1599 }
1600 bitmap->last_end_sync = jiffies;
1601 sysfs_notify(&bitmap->mddev->kobj, NULL, "sync_completed");
1602}
1603EXPORT_SYMBOL(bitmap_cond_end_sync);
1604
1605static void bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset, int needed)
1606{
1607
1608
1609
1610
1611
1612 sector_t secs;
1613 bitmap_counter_t *bmc;
1614 spin_lock_irq(&bitmap->counts.lock);
1615 bmc = bitmap_get_counter(&bitmap->counts, offset, &secs, 1);
1616 if (!bmc) {
1617 spin_unlock_irq(&bitmap->counts.lock);
1618 return;
1619 }
1620 if (!*bmc) {
1621 *bmc = 2;
1622 bitmap_count_page(&bitmap->counts, offset, 1);
1623 bitmap_set_pending(&bitmap->counts, offset);
1624 bitmap->allclean = 0;
1625 }
1626 if (needed)
1627 *bmc |= NEEDED_MASK;
1628 spin_unlock_irq(&bitmap->counts.lock);
1629}
1630
1631
1632void bitmap_dirty_bits(struct bitmap *bitmap, unsigned long s, unsigned long e)
1633{
1634 unsigned long chunk;
1635
1636 for (chunk = s; chunk <= e; chunk++) {
1637 sector_t sec = (sector_t)chunk << bitmap->counts.chunkshift;
1638 bitmap_set_memory_bits(bitmap, sec, 1);
1639 bitmap_file_set_bit(bitmap, sec);
1640 if (sec < bitmap->mddev->recovery_cp)
1641
1642
1643
1644
1645 bitmap->mddev->recovery_cp = sec;
1646 }
1647}
1648
1649
1650
1651
1652void bitmap_flush(struct mddev *mddev)
1653{
1654 struct bitmap *bitmap = mddev->bitmap;
1655 long sleep;
1656
1657 if (!bitmap)
1658 return;
1659
1660
1661
1662
1663 sleep = mddev->bitmap_info.daemon_sleep * 2;
1664 bitmap->daemon_lastrun -= sleep;
1665 bitmap_daemon_work(mddev);
1666 bitmap->daemon_lastrun -= sleep;
1667 bitmap_daemon_work(mddev);
1668 bitmap->daemon_lastrun -= sleep;
1669 bitmap_daemon_work(mddev);
1670 bitmap_update_sb(bitmap);
1671}
1672
1673
1674
1675
1676static void bitmap_free(struct bitmap *bitmap)
1677{
1678 unsigned long k, pages;
1679 struct bitmap_page *bp;
1680
1681 if (!bitmap)
1682 return;
1683
1684 if (mddev_is_clustered(bitmap->mddev) && bitmap->mddev->cluster_info &&
1685 bitmap->cluster_slot == md_cluster_ops->slot_number(bitmap->mddev))
1686 md_cluster_stop(bitmap->mddev);
1687
1688
1689 wait_event(bitmap->write_wait,
1690 atomic_read(&bitmap->pending_writes) == 0);
1691
1692
1693 bitmap_file_unmap(&bitmap->storage);
1694
1695 bp = bitmap->counts.bp;
1696 pages = bitmap->counts.pages;
1697
1698
1699
1700 if (bp)
1701 for (k = 0; k < pages; k++)
1702 if (bp[k].map && !bp[k].hijacked)
1703 kfree(bp[k].map);
1704 kfree(bp);
1705 kfree(bitmap);
1706}
1707
1708void bitmap_destroy(struct mddev *mddev)
1709{
1710 struct bitmap *bitmap = mddev->bitmap;
1711
1712 if (!bitmap)
1713 return;
1714
1715 mutex_lock(&mddev->bitmap_info.mutex);
1716 spin_lock(&mddev->lock);
1717 mddev->bitmap = NULL;
1718 spin_unlock(&mddev->lock);
1719 mutex_unlock(&mddev->bitmap_info.mutex);
1720 if (mddev->thread)
1721 mddev->thread->timeout = MAX_SCHEDULE_TIMEOUT;
1722
1723 if (bitmap->sysfs_can_clear)
1724 sysfs_put(bitmap->sysfs_can_clear);
1725
1726 bitmap_free(bitmap);
1727}
1728
1729
1730
1731
1732
1733struct bitmap *bitmap_create(struct mddev *mddev, int slot)
1734{
1735 struct bitmap *bitmap;
1736 sector_t blocks = mddev->resync_max_sectors;
1737 struct file *file = mddev->bitmap_info.file;
1738 int err;
1739 struct kernfs_node *bm = NULL;
1740
1741 BUILD_BUG_ON(sizeof(bitmap_super_t) != 256);
1742
1743 BUG_ON(file && mddev->bitmap_info.offset);
1744
1745 bitmap = kzalloc(sizeof(*bitmap), GFP_KERNEL);
1746 if (!bitmap)
1747 return ERR_PTR(-ENOMEM);
1748
1749 spin_lock_init(&bitmap->counts.lock);
1750 atomic_set(&bitmap->pending_writes, 0);
1751 init_waitqueue_head(&bitmap->write_wait);
1752 init_waitqueue_head(&bitmap->overflow_wait);
1753 init_waitqueue_head(&bitmap->behind_wait);
1754
1755 bitmap->mddev = mddev;
1756 bitmap->cluster_slot = slot;
1757
1758 if (mddev->kobj.sd)
1759 bm = sysfs_get_dirent(mddev->kobj.sd, "bitmap");
1760 if (bm) {
1761 bitmap->sysfs_can_clear = sysfs_get_dirent(bm, "can_clear");
1762 sysfs_put(bm);
1763 } else
1764 bitmap->sysfs_can_clear = NULL;
1765
1766 bitmap->storage.file = file;
1767 if (file) {
1768 get_file(file);
1769
1770
1771
1772
1773 vfs_fsync(file, 1);
1774 }
1775
1776 if (!mddev->bitmap_info.external) {
1777
1778
1779
1780
1781 if (test_and_clear_bit(MD_ARRAY_FIRST_USE, &mddev->flags))
1782 err = bitmap_new_disk_sb(bitmap);
1783 else
1784 err = bitmap_read_sb(bitmap);
1785 } else {
1786 err = 0;
1787 if (mddev->bitmap_info.chunksize == 0 ||
1788 mddev->bitmap_info.daemon_sleep == 0)
1789
1790
1791 err = -EINVAL;
1792 }
1793 if (err)
1794 goto error;
1795
1796 bitmap->daemon_lastrun = jiffies;
1797 err = bitmap_resize(bitmap, blocks, mddev->bitmap_info.chunksize, 1);
1798 if (err)
1799 goto error;
1800
1801 printk(KERN_INFO "created bitmap (%lu pages) for device %s\n",
1802 bitmap->counts.pages, bmname(bitmap));
1803
1804 err = test_bit(BITMAP_WRITE_ERROR, &bitmap->flags) ? -EIO : 0;
1805 if (err)
1806 goto error;
1807
1808 return bitmap;
1809 error:
1810 bitmap_free(bitmap);
1811 return ERR_PTR(err);
1812}
1813
1814int bitmap_load(struct mddev *mddev)
1815{
1816 int err = 0;
1817 sector_t start = 0;
1818 sector_t sector = 0;
1819 struct bitmap *bitmap = mddev->bitmap;
1820
1821 if (!bitmap)
1822 goto out;
1823
1824
1825
1826
1827
1828
1829 while (sector < mddev->resync_max_sectors) {
1830 sector_t blocks;
1831 bitmap_start_sync(bitmap, sector, &blocks, 0);
1832 sector += blocks;
1833 }
1834 bitmap_close_sync(bitmap);
1835
1836 if (mddev->degraded == 0
1837 || bitmap->events_cleared == mddev->events)
1838
1839
1840 start = mddev->recovery_cp;
1841
1842 mutex_lock(&mddev->bitmap_info.mutex);
1843 err = bitmap_init_from_disk(bitmap, start);
1844 mutex_unlock(&mddev->bitmap_info.mutex);
1845
1846 if (err)
1847 goto out;
1848 clear_bit(BITMAP_STALE, &bitmap->flags);
1849
1850
1851 set_bit(MD_RECOVERY_NEEDED, &bitmap->mddev->recovery);
1852
1853 mddev->thread->timeout = mddev->bitmap_info.daemon_sleep;
1854 md_wakeup_thread(mddev->thread);
1855
1856 bitmap_update_sb(bitmap);
1857
1858 if (test_bit(BITMAP_WRITE_ERROR, &bitmap->flags))
1859 err = -EIO;
1860out:
1861 return err;
1862}
1863EXPORT_SYMBOL_GPL(bitmap_load);
1864
1865
1866
1867
1868int bitmap_copy_from_slot(struct mddev *mddev, int slot,
1869 sector_t *low, sector_t *high, bool clear_bits)
1870{
1871 int rv = 0, i, j;
1872 sector_t block, lo = 0, hi = 0;
1873 struct bitmap_counts *counts;
1874 struct bitmap *bitmap = bitmap_create(mddev, slot);
1875
1876 if (IS_ERR(bitmap))
1877 return PTR_ERR(bitmap);
1878
1879 rv = bitmap_init_from_disk(bitmap, 0);
1880 if (rv)
1881 goto err;
1882
1883 counts = &bitmap->counts;
1884 for (j = 0; j < counts->chunks; j++) {
1885 block = (sector_t)j << counts->chunkshift;
1886 if (bitmap_file_test_bit(bitmap, block)) {
1887 if (!lo)
1888 lo = block;
1889 hi = block;
1890 bitmap_file_clear_bit(bitmap, block);
1891 bitmap_set_memory_bits(mddev->bitmap, block, 1);
1892 bitmap_file_set_bit(mddev->bitmap, block);
1893 }
1894 }
1895
1896 if (clear_bits) {
1897 bitmap_update_sb(bitmap);
1898
1899
1900
1901 for (i = 0; i < bitmap->storage.file_pages; i++)
1902 set_page_attr(bitmap, i, BITMAP_PAGE_DIRTY);
1903 bitmap_write_all(bitmap);
1904 bitmap_unplug(bitmap);
1905 }
1906 *low = lo;
1907 *high = hi;
1908err:
1909 bitmap_free(bitmap);
1910 return rv;
1911}
1912EXPORT_SYMBOL_GPL(bitmap_copy_from_slot);
1913
1914
1915void bitmap_status(struct seq_file *seq, struct bitmap *bitmap)
1916{
1917 unsigned long chunk_kb;
1918 struct bitmap_counts *counts;
1919
1920 if (!bitmap)
1921 return;
1922
1923 counts = &bitmap->counts;
1924
1925 chunk_kb = bitmap->mddev->bitmap_info.chunksize >> 10;
1926 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
1927 "%lu%s chunk",
1928 counts->pages - counts->missing_pages,
1929 counts->pages,
1930 (counts->pages - counts->missing_pages)
1931 << (PAGE_SHIFT - 10),
1932 chunk_kb ? chunk_kb : bitmap->mddev->bitmap_info.chunksize,
1933 chunk_kb ? "KB" : "B");
1934 if (bitmap->storage.file) {
1935 seq_printf(seq, ", file: ");
1936 seq_file_path(seq, bitmap->storage.file, " \t\n");
1937 }
1938
1939 seq_printf(seq, "\n");
1940}
1941
1942int bitmap_resize(struct bitmap *bitmap, sector_t blocks,
1943 int chunksize, int init)
1944{
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955 struct bitmap_storage store;
1956 struct bitmap_counts old_counts;
1957 unsigned long chunks;
1958 sector_t block;
1959 sector_t old_blocks, new_blocks;
1960 int chunkshift;
1961 int ret = 0;
1962 long pages;
1963 struct bitmap_page *new_bp;
1964
1965 if (chunksize == 0) {
1966
1967
1968
1969 long bytes;
1970 long space = bitmap->mddev->bitmap_info.space;
1971
1972 if (space == 0) {
1973
1974
1975
1976 bytes = DIV_ROUND_UP(bitmap->counts.chunks, 8);
1977 if (!bitmap->mddev->bitmap_info.external)
1978 bytes += sizeof(bitmap_super_t);
1979 space = DIV_ROUND_UP(bytes, 512);
1980 bitmap->mddev->bitmap_info.space = space;
1981 }
1982 chunkshift = bitmap->counts.chunkshift;
1983 chunkshift--;
1984 do {
1985
1986 chunkshift++;
1987 chunks = DIV_ROUND_UP_SECTOR_T(blocks, 1 << chunkshift);
1988 bytes = DIV_ROUND_UP(chunks, 8);
1989 if (!bitmap->mddev->bitmap_info.external)
1990 bytes += sizeof(bitmap_super_t);
1991 } while (bytes > (space << 9));
1992 } else
1993 chunkshift = ffz(~chunksize) - BITMAP_BLOCK_SHIFT;
1994
1995 chunks = DIV_ROUND_UP_SECTOR_T(blocks, 1 << chunkshift);
1996 memset(&store, 0, sizeof(store));
1997 if (bitmap->mddev->bitmap_info.offset || bitmap->mddev->bitmap_info.file)
1998 ret = bitmap_storage_alloc(&store, chunks,
1999 !bitmap->mddev->bitmap_info.external,
2000 bitmap->cluster_slot);
2001 if (ret)
2002 goto err;
2003
2004 pages = DIV_ROUND_UP(chunks, PAGE_COUNTER_RATIO);
2005
2006 new_bp = kzalloc(pages * sizeof(*new_bp), GFP_KERNEL);
2007 ret = -ENOMEM;
2008 if (!new_bp) {
2009 bitmap_file_unmap(&store);
2010 goto err;
2011 }
2012
2013 if (!init)
2014 bitmap->mddev->pers->quiesce(bitmap->mddev, 1);
2015
2016 store.file = bitmap->storage.file;
2017 bitmap->storage.file = NULL;
2018
2019 if (store.sb_page && bitmap->storage.sb_page)
2020 memcpy(page_address(store.sb_page),
2021 page_address(bitmap->storage.sb_page),
2022 sizeof(bitmap_super_t));
2023 bitmap_file_unmap(&bitmap->storage);
2024 bitmap->storage = store;
2025
2026 old_counts = bitmap->counts;
2027 bitmap->counts.bp = new_bp;
2028 bitmap->counts.pages = pages;
2029 bitmap->counts.missing_pages = pages;
2030 bitmap->counts.chunkshift = chunkshift;
2031 bitmap->counts.chunks = chunks;
2032 bitmap->mddev->bitmap_info.chunksize = 1 << (chunkshift +
2033 BITMAP_BLOCK_SHIFT);
2034
2035 blocks = min(old_counts.chunks << old_counts.chunkshift,
2036 chunks << chunkshift);
2037
2038 spin_lock_irq(&bitmap->counts.lock);
2039 for (block = 0; block < blocks; ) {
2040 bitmap_counter_t *bmc_old, *bmc_new;
2041 int set;
2042
2043 bmc_old = bitmap_get_counter(&old_counts, block,
2044 &old_blocks, 0);
2045 set = bmc_old && NEEDED(*bmc_old);
2046
2047 if (set) {
2048 bmc_new = bitmap_get_counter(&bitmap->counts, block,
2049 &new_blocks, 1);
2050 if (*bmc_new == 0) {
2051
2052 sector_t end = block + new_blocks;
2053 sector_t start = block >> chunkshift;
2054 start <<= chunkshift;
2055 while (start < end) {
2056 bitmap_file_set_bit(bitmap, block);
2057 start += 1 << chunkshift;
2058 }
2059 *bmc_new = 2;
2060 bitmap_count_page(&bitmap->counts,
2061 block, 1);
2062 bitmap_set_pending(&bitmap->counts,
2063 block);
2064 }
2065 *bmc_new |= NEEDED_MASK;
2066 if (new_blocks < old_blocks)
2067 old_blocks = new_blocks;
2068 }
2069 block += old_blocks;
2070 }
2071
2072 if (!init) {
2073 int i;
2074 while (block < (chunks << chunkshift)) {
2075 bitmap_counter_t *bmc;
2076 bmc = bitmap_get_counter(&bitmap->counts, block,
2077 &new_blocks, 1);
2078 if (bmc) {
2079
2080
2081
2082 if (*bmc == 0) {
2083 *bmc = NEEDED_MASK | 2;
2084 bitmap_count_page(&bitmap->counts,
2085 block, 1);
2086 bitmap_set_pending(&bitmap->counts,
2087 block);
2088 }
2089 }
2090 block += new_blocks;
2091 }
2092 for (i = 0; i < bitmap->storage.file_pages; i++)
2093 set_page_attr(bitmap, i, BITMAP_PAGE_DIRTY);
2094 }
2095 spin_unlock_irq(&bitmap->counts.lock);
2096
2097 if (!init) {
2098 bitmap_unplug(bitmap);
2099 bitmap->mddev->pers->quiesce(bitmap->mddev, 0);
2100 }
2101 ret = 0;
2102err:
2103 return ret;
2104}
2105EXPORT_SYMBOL_GPL(bitmap_resize);
2106
2107static ssize_t
2108location_show(struct mddev *mddev, char *page)
2109{
2110 ssize_t len;
2111 if (mddev->bitmap_info.file)
2112 len = sprintf(page, "file");
2113 else if (mddev->bitmap_info.offset)
2114 len = sprintf(page, "%+lld", (long long)mddev->bitmap_info.offset);
2115 else
2116 len = sprintf(page, "none");
2117 len += sprintf(page+len, "\n");
2118 return len;
2119}
2120
2121static ssize_t
2122location_store(struct mddev *mddev, const char *buf, size_t len)
2123{
2124
2125 if (mddev->pers) {
2126 if (!mddev->pers->quiesce)
2127 return -EBUSY;
2128 if (mddev->recovery || mddev->sync_thread)
2129 return -EBUSY;
2130 }
2131
2132 if (mddev->bitmap || mddev->bitmap_info.file ||
2133 mddev->bitmap_info.offset) {
2134
2135 if (strncmp(buf, "none", 4) != 0)
2136 return -EBUSY;
2137 if (mddev->pers) {
2138 mddev->pers->quiesce(mddev, 1);
2139 bitmap_destroy(mddev);
2140 mddev->pers->quiesce(mddev, 0);
2141 }
2142 mddev->bitmap_info.offset = 0;
2143 if (mddev->bitmap_info.file) {
2144 struct file *f = mddev->bitmap_info.file;
2145 mddev->bitmap_info.file = NULL;
2146 fput(f);
2147 }
2148 } else {
2149
2150 long long offset;
2151 if (strncmp(buf, "none", 4) == 0)
2152 ;
2153 else if (strncmp(buf, "file:", 5) == 0) {
2154
2155 return -EINVAL;
2156 } else {
2157 int rv;
2158 if (buf[0] == '+')
2159 rv = kstrtoll(buf+1, 10, &offset);
2160 else
2161 rv = kstrtoll(buf, 10, &offset);
2162 if (rv)
2163 return rv;
2164 if (offset == 0)
2165 return -EINVAL;
2166 if (mddev->bitmap_info.external == 0 &&
2167 mddev->major_version == 0 &&
2168 offset != mddev->bitmap_info.default_offset)
2169 return -EINVAL;
2170 mddev->bitmap_info.offset = offset;
2171 if (mddev->pers) {
2172 struct bitmap *bitmap;
2173 mddev->pers->quiesce(mddev, 1);
2174 bitmap = bitmap_create(mddev, -1);
2175 if (IS_ERR(bitmap))
2176 rv = PTR_ERR(bitmap);
2177 else {
2178 mddev->bitmap = bitmap;
2179 rv = bitmap_load(mddev);
2180 if (rv) {
2181 bitmap_destroy(mddev);
2182 mddev->bitmap_info.offset = 0;
2183 }
2184 }
2185 mddev->pers->quiesce(mddev, 0);
2186 if (rv)
2187 return rv;
2188 }
2189 }
2190 }
2191 if (!mddev->external) {
2192
2193
2194
2195 set_bit(MD_CHANGE_DEVS, &mddev->flags);
2196 md_wakeup_thread(mddev->thread);
2197 }
2198 return len;
2199}
2200
2201static struct md_sysfs_entry bitmap_location =
2202__ATTR(location, S_IRUGO|S_IWUSR, location_show, location_store);
2203
2204
2205
2206
2207
2208static ssize_t
2209space_show(struct mddev *mddev, char *page)
2210{
2211 return sprintf(page, "%lu\n", mddev->bitmap_info.space);
2212}
2213
2214static ssize_t
2215space_store(struct mddev *mddev, const char *buf, size_t len)
2216{
2217 unsigned long sectors;
2218 int rv;
2219
2220 rv = kstrtoul(buf, 10, §ors);
2221 if (rv)
2222 return rv;
2223
2224 if (sectors == 0)
2225 return -EINVAL;
2226
2227 if (mddev->bitmap &&
2228 sectors < (mddev->bitmap->storage.bytes + 511) >> 9)
2229 return -EFBIG;
2230
2231
2232
2233
2234 mddev->bitmap_info.space = sectors;
2235 return len;
2236}
2237
2238static struct md_sysfs_entry bitmap_space =
2239__ATTR(space, S_IRUGO|S_IWUSR, space_show, space_store);
2240
2241static ssize_t
2242timeout_show(struct mddev *mddev, char *page)
2243{
2244 ssize_t len;
2245 unsigned long secs = mddev->bitmap_info.daemon_sleep / HZ;
2246 unsigned long jifs = mddev->bitmap_info.daemon_sleep % HZ;
2247
2248 len = sprintf(page, "%lu", secs);
2249 if (jifs)
2250 len += sprintf(page+len, ".%03u", jiffies_to_msecs(jifs));
2251 len += sprintf(page+len, "\n");
2252 return len;
2253}
2254
2255static ssize_t
2256timeout_store(struct mddev *mddev, const char *buf, size_t len)
2257{
2258
2259 unsigned long timeout;
2260 int rv = strict_strtoul_scaled(buf, &timeout, 4);
2261 if (rv)
2262 return rv;
2263
2264
2265 if (timeout >= LONG_MAX / HZ)
2266 return -EINVAL;
2267
2268 timeout = timeout * HZ / 10000;
2269
2270 if (timeout >= MAX_SCHEDULE_TIMEOUT)
2271 timeout = MAX_SCHEDULE_TIMEOUT-1;
2272 if (timeout < 1)
2273 timeout = 1;
2274 mddev->bitmap_info.daemon_sleep = timeout;
2275 if (mddev->thread) {
2276
2277
2278
2279
2280 if (mddev->thread->timeout < MAX_SCHEDULE_TIMEOUT) {
2281 mddev->thread->timeout = timeout;
2282 md_wakeup_thread(mddev->thread);
2283 }
2284 }
2285 return len;
2286}
2287
2288static struct md_sysfs_entry bitmap_timeout =
2289__ATTR(time_base, S_IRUGO|S_IWUSR, timeout_show, timeout_store);
2290
2291static ssize_t
2292backlog_show(struct mddev *mddev, char *page)
2293{
2294 return sprintf(page, "%lu\n", mddev->bitmap_info.max_write_behind);
2295}
2296
2297static ssize_t
2298backlog_store(struct mddev *mddev, const char *buf, size_t len)
2299{
2300 unsigned long backlog;
2301 int rv = kstrtoul(buf, 10, &backlog);
2302 if (rv)
2303 return rv;
2304 if (backlog > COUNTER_MAX)
2305 return -EINVAL;
2306 mddev->bitmap_info.max_write_behind = backlog;
2307 return len;
2308}
2309
2310static struct md_sysfs_entry bitmap_backlog =
2311__ATTR(backlog, S_IRUGO|S_IWUSR, backlog_show, backlog_store);
2312
2313static ssize_t
2314chunksize_show(struct mddev *mddev, char *page)
2315{
2316 return sprintf(page, "%lu\n", mddev->bitmap_info.chunksize);
2317}
2318
2319static ssize_t
2320chunksize_store(struct mddev *mddev, const char *buf, size_t len)
2321{
2322
2323 int rv;
2324 unsigned long csize;
2325 if (mddev->bitmap)
2326 return -EBUSY;
2327 rv = kstrtoul(buf, 10, &csize);
2328 if (rv)
2329 return rv;
2330 if (csize < 512 ||
2331 !is_power_of_2(csize))
2332 return -EINVAL;
2333 mddev->bitmap_info.chunksize = csize;
2334 return len;
2335}
2336
2337static struct md_sysfs_entry bitmap_chunksize =
2338__ATTR(chunksize, S_IRUGO|S_IWUSR, chunksize_show, chunksize_store);
2339
2340static ssize_t metadata_show(struct mddev *mddev, char *page)
2341{
2342 if (mddev_is_clustered(mddev))
2343 return sprintf(page, "clustered\n");
2344 return sprintf(page, "%s\n", (mddev->bitmap_info.external
2345 ? "external" : "internal"));
2346}
2347
2348static ssize_t metadata_store(struct mddev *mddev, const char *buf, size_t len)
2349{
2350 if (mddev->bitmap ||
2351 mddev->bitmap_info.file ||
2352 mddev->bitmap_info.offset)
2353 return -EBUSY;
2354 if (strncmp(buf, "external", 8) == 0)
2355 mddev->bitmap_info.external = 1;
2356 else if ((strncmp(buf, "internal", 8) == 0) ||
2357 (strncmp(buf, "clustered", 9) == 0))
2358 mddev->bitmap_info.external = 0;
2359 else
2360 return -EINVAL;
2361 return len;
2362}
2363
2364static struct md_sysfs_entry bitmap_metadata =
2365__ATTR(metadata, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
2366
2367static ssize_t can_clear_show(struct mddev *mddev, char *page)
2368{
2369 int len;
2370 spin_lock(&mddev->lock);
2371 if (mddev->bitmap)
2372 len = sprintf(page, "%s\n", (mddev->bitmap->need_sync ?
2373 "false" : "true"));
2374 else
2375 len = sprintf(page, "\n");
2376 spin_unlock(&mddev->lock);
2377 return len;
2378}
2379
2380static ssize_t can_clear_store(struct mddev *mddev, const char *buf, size_t len)
2381{
2382 if (mddev->bitmap == NULL)
2383 return -ENOENT;
2384 if (strncmp(buf, "false", 5) == 0)
2385 mddev->bitmap->need_sync = 1;
2386 else if (strncmp(buf, "true", 4) == 0) {
2387 if (mddev->degraded)
2388 return -EBUSY;
2389 mddev->bitmap->need_sync = 0;
2390 } else
2391 return -EINVAL;
2392 return len;
2393}
2394
2395static struct md_sysfs_entry bitmap_can_clear =
2396__ATTR(can_clear, S_IRUGO|S_IWUSR, can_clear_show, can_clear_store);
2397
2398static ssize_t
2399behind_writes_used_show(struct mddev *mddev, char *page)
2400{
2401 ssize_t ret;
2402 spin_lock(&mddev->lock);
2403 if (mddev->bitmap == NULL)
2404 ret = sprintf(page, "0\n");
2405 else
2406 ret = sprintf(page, "%lu\n",
2407 mddev->bitmap->behind_writes_used);
2408 spin_unlock(&mddev->lock);
2409 return ret;
2410}
2411
2412static ssize_t
2413behind_writes_used_reset(struct mddev *mddev, const char *buf, size_t len)
2414{
2415 if (mddev->bitmap)
2416 mddev->bitmap->behind_writes_used = 0;
2417 return len;
2418}
2419
2420static struct md_sysfs_entry max_backlog_used =
2421__ATTR(max_backlog_used, S_IRUGO | S_IWUSR,
2422 behind_writes_used_show, behind_writes_used_reset);
2423
2424static struct attribute *md_bitmap_attrs[] = {
2425 &bitmap_location.attr,
2426 &bitmap_space.attr,
2427 &bitmap_timeout.attr,
2428 &bitmap_backlog.attr,
2429 &bitmap_chunksize.attr,
2430 &bitmap_metadata.attr,
2431 &bitmap_can_clear.attr,
2432 &max_backlog_used.attr,
2433 NULL
2434};
2435struct attribute_group md_bitmap_group = {
2436 .name = "bitmap",
2437 .attrs = md_bitmap_attrs,
2438};
2439
2440