2 * bitmap.c two-level bitmap (C) Peter T. Breuer (ptb@ot.uc3m.es) 2003
4 * bitmap_create - sets up the bitmap structure
5 * bitmap_destroy - destroys the bitmap structure
7 * additions, Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.:
8 * - added disk storage for bitmap
9 * - changes to allow various bitmap chunk sizes
15 * flush after percent set rather than just time based. (maybe both).
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 <trace/events/block.h>
34 static inline char *bmname(struct bitmap *bitmap)
36 return bitmap->mddev ? mdname(bitmap->mddev) : "mdX";
40 * check a page and, if necessary, allocate it (or hijack it if the alloc fails)
42 * 1) check to see if this page is allocated, if it's not then try to alloc
43 * 2) if the alloc fails, set the page's hijacked flag so we'll use the
44 * page pointer directly as a counter
46 * if we find our page, we increment the page's refcount so that it stays
47 * allocated while we're using it
49 static int bitmap_checkpage(struct bitmap_counts *bitmap,
50 unsigned long page, int create, int no_hijack)
51 __releases(bitmap->lock)
52 __acquires(bitmap->lock)
54 unsigned char *mappage;
56 if (page >= bitmap->pages) {
57 /* This can happen if bitmap_start_sync goes beyond
58 * End-of-device while looking for a whole page.
64 if (bitmap->bp[page].hijacked) /* it's hijacked, don't try to alloc */
67 if (bitmap->bp[page].map) /* page is already allocated, just return */
73 /* this page has not been allocated yet */
75 spin_unlock_irq(&bitmap->lock);
76 /* It is possible that this is being called inside a
77 * prepare_to_wait/finish_wait loop from raid5c:make_request().
78 * In general it is not permitted to sleep in that context as it
79 * can cause the loop to spin freely.
80 * That doesn't apply here as we can only reach this point
82 * When this function completes, either bp[page].map or
83 * bp[page].hijacked. In either case, this function will
84 * abort before getting to this point again. So there is
85 * no risk of a free-spin, and so it is safe to assert
86 * that sleeping here is allowed.
88 sched_annotate_sleep();
89 mappage = kzalloc(PAGE_SIZE, GFP_NOIO);
90 spin_lock_irq(&bitmap->lock);
92 if (mappage == NULL) {
93 pr_debug("md/bitmap: map page allocation failed, hijacking\n");
94 /* We don't support hijack for cluster raid */
97 /* failed - set the hijacked flag so that we can use the
98 * pointer as a counter */
99 if (!bitmap->bp[page].map)
100 bitmap->bp[page].hijacked = 1;
101 } else if (bitmap->bp[page].map ||
102 bitmap->bp[page].hijacked) {
103 /* somebody beat us to getting the page */
107 /* no page was in place and we have one, so install it */
109 bitmap->bp[page].map = mappage;
110 bitmap->missing_pages--;
115 /* if page is completely empty, put it back on the free list, or dealloc it */
116 /* if page was hijacked, unmark the flag so it might get alloced next time */
117 /* Note: lock should be held when calling this */
118 static void bitmap_checkfree(struct bitmap_counts *bitmap, unsigned long page)
122 if (bitmap->bp[page].count) /* page is still busy */
125 /* page is no longer in use, it can be released */
127 if (bitmap->bp[page].hijacked) { /* page was hijacked, undo this now */
128 bitmap->bp[page].hijacked = 0;
129 bitmap->bp[page].map = NULL;
131 /* normal case, free the page */
132 ptr = bitmap->bp[page].map;
133 bitmap->bp[page].map = NULL;
134 bitmap->missing_pages++;
140 * bitmap file handling - read and write the bitmap file and its superblock
144 * basic page I/O operations
147 /* IO operations when bitmap is stored near all superblocks */
148 static int read_sb_page(struct mddev *mddev, loff_t offset,
150 unsigned long index, int size)
152 /* choose a good rdev and read the page from there */
154 struct md_rdev *rdev;
157 rdev_for_each(rdev, mddev) {
158 if (! test_bit(In_sync, &rdev->flags)
159 || test_bit(Faulty, &rdev->flags)
160 || test_bit(Bitmap_sync, &rdev->flags))
163 target = offset + index * (PAGE_SIZE/512);
165 if (sync_page_io(rdev, target,
166 roundup(size, bdev_logical_block_size(rdev->bdev)),
167 page, REQ_OP_READ, 0, true)) {
175 static struct md_rdev *next_active_rdev(struct md_rdev *rdev, struct mddev *mddev)
177 /* Iterate the disks of an mddev, using rcu to protect access to the
178 * linked list, and raising the refcount of devices we return to ensure
179 * they don't disappear while in use.
180 * As devices are only added or removed when raid_disk is < 0 and
181 * nr_pending is 0 and In_sync is clear, the entries we return will
182 * still be in the same position on the list when we re-enter
183 * list_for_each_entry_continue_rcu.
185 * Note that if entered with 'rdev == NULL' to start at the
186 * beginning, we temporarily assign 'rdev' to an address which
187 * isn't really an rdev, but which can be used by
188 * list_for_each_entry_continue_rcu() to find the first entry.
192 /* start at the beginning */
193 rdev = list_entry(&mddev->disks, struct md_rdev, same_set);
195 /* release the previous rdev and start from there. */
196 rdev_dec_pending(rdev, mddev);
198 list_for_each_entry_continue_rcu(rdev, &mddev->disks, same_set) {
199 if (rdev->raid_disk >= 0 &&
200 !test_bit(Faulty, &rdev->flags)) {
201 /* this is a usable devices */
202 atomic_inc(&rdev->nr_pending);
211 static int write_sb_page(struct bitmap *bitmap, struct page *page, int wait)
213 struct md_rdev *rdev;
214 struct block_device *bdev;
215 struct mddev *mddev = bitmap->mddev;
216 struct bitmap_storage *store = &bitmap->storage;
220 while ((rdev = next_active_rdev(rdev, mddev)) != NULL) {
221 int size = PAGE_SIZE;
222 loff_t offset = mddev->bitmap_info.offset;
224 bdev = (rdev->meta_bdev) ? rdev->meta_bdev : rdev->bdev;
226 if (page->index == store->file_pages-1) {
227 int last_page_size = store->bytes & (PAGE_SIZE-1);
228 if (last_page_size == 0)
229 last_page_size = PAGE_SIZE;
230 size = roundup(last_page_size,
231 bdev_logical_block_size(bdev));
233 /* Just make sure we aren't corrupting data or
236 if (mddev->external) {
237 /* Bitmap could be anywhere. */
238 if (rdev->sb_start + offset + (page->index
242 rdev->sb_start + offset
243 < (rdev->data_offset + mddev->dev_sectors
246 } else if (offset < 0) {
247 /* DATA BITMAP METADATA */
249 + (long)(page->index * (PAGE_SIZE/512))
251 /* bitmap runs in to metadata */
253 if (rdev->data_offset + mddev->dev_sectors
254 > rdev->sb_start + offset)
255 /* data runs in to bitmap */
257 } else if (rdev->sb_start < rdev->data_offset) {
258 /* METADATA BITMAP DATA */
261 + page->index*(PAGE_SIZE/512) + size/512
263 /* bitmap runs in to data */
266 /* DATA METADATA BITMAP - no problems */
268 md_super_write(mddev, rdev,
269 rdev->sb_start + offset
270 + page->index * (PAGE_SIZE/512),
275 if (wait && md_super_wait(mddev) < 0)
283 static void bitmap_file_kick(struct bitmap *bitmap);
285 * write out a page to a file
287 static void write_page(struct bitmap *bitmap, struct page *page, int wait)
289 struct buffer_head *bh;
291 if (bitmap->storage.file == NULL) {
292 switch (write_sb_page(bitmap, page, wait)) {
294 set_bit(BITMAP_WRITE_ERROR, &bitmap->flags);
298 bh = page_buffers(page);
300 while (bh && bh->b_blocknr) {
301 atomic_inc(&bitmap->pending_writes);
302 set_buffer_locked(bh);
303 set_buffer_mapped(bh);
304 submit_bh(REQ_OP_WRITE, REQ_SYNC, bh);
305 bh = bh->b_this_page;
309 wait_event(bitmap->write_wait,
310 atomic_read(&bitmap->pending_writes)==0);
312 if (test_bit(BITMAP_WRITE_ERROR, &bitmap->flags))
313 bitmap_file_kick(bitmap);
316 static void end_bitmap_write(struct buffer_head *bh, int uptodate)
318 struct bitmap *bitmap = bh->b_private;
321 set_bit(BITMAP_WRITE_ERROR, &bitmap->flags);
322 if (atomic_dec_and_test(&bitmap->pending_writes))
323 wake_up(&bitmap->write_wait);
326 /* copied from buffer.c */
328 __clear_page_buffers(struct page *page)
330 ClearPagePrivate(page);
331 set_page_private(page, 0);
334 static void free_buffers(struct page *page)
336 struct buffer_head *bh;
338 if (!PagePrivate(page))
341 bh = page_buffers(page);
343 struct buffer_head *next = bh->b_this_page;
344 free_buffer_head(bh);
347 __clear_page_buffers(page);
351 /* read a page from a file.
352 * We both read the page, and attach buffers to the page to record the
353 * address of each block (using bmap). These addresses will be used
354 * to write the block later, completely bypassing the filesystem.
355 * This usage is similar to how swap files are handled, and allows us
356 * to write to a file with no concerns of memory allocation failing.
358 static int read_page(struct file *file, unsigned long index,
359 struct bitmap *bitmap,
364 struct inode *inode = file_inode(file);
365 struct buffer_head *bh;
368 pr_debug("read bitmap file (%dB @ %llu)\n", (int)PAGE_SIZE,
369 (unsigned long long)index << PAGE_SHIFT);
371 bh = alloc_page_buffers(page, 1<<inode->i_blkbits, 0);
376 attach_page_buffers(page, bh);
377 block = index << (PAGE_SHIFT - inode->i_blkbits);
382 bh->b_blocknr = bmap(inode, block);
383 if (bh->b_blocknr == 0) {
384 /* Cannot use this file! */
388 bh->b_bdev = inode->i_sb->s_bdev;
389 if (count < (1<<inode->i_blkbits))
392 count -= (1<<inode->i_blkbits);
394 bh->b_end_io = end_bitmap_write;
395 bh->b_private = bitmap;
396 atomic_inc(&bitmap->pending_writes);
397 set_buffer_locked(bh);
398 set_buffer_mapped(bh);
399 submit_bh(REQ_OP_READ, 0, bh);
402 bh = bh->b_this_page;
406 wait_event(bitmap->write_wait,
407 atomic_read(&bitmap->pending_writes)==0);
408 if (test_bit(BITMAP_WRITE_ERROR, &bitmap->flags))
412 pr_err("md: bitmap read error: (%dB @ %llu): %d\n",
414 (unsigned long long)index << PAGE_SHIFT,
420 * bitmap file superblock operations
424 * bitmap_wait_writes() should be called before writing any bitmap
425 * blocks, to ensure previous writes, particularly from
426 * bitmap_daemon_work(), have completed.
428 static void bitmap_wait_writes(struct bitmap *bitmap)
430 if (bitmap->storage.file)
431 wait_event(bitmap->write_wait,
432 atomic_read(&bitmap->pending_writes)==0);
434 /* Note that we ignore the return value. The writes
435 * might have failed, but that would just mean that
436 * some bits which should be cleared haven't been,
437 * which is safe. The relevant bitmap blocks will
438 * probably get written again, but there is no great
439 * loss if they aren't.
441 md_super_wait(bitmap->mddev);
445 /* update the event counter and sync the superblock to disk */
446 void bitmap_update_sb(struct bitmap *bitmap)
450 if (!bitmap || !bitmap->mddev) /* no bitmap for this array */
452 if (bitmap->mddev->bitmap_info.external)
454 if (!bitmap->storage.sb_page) /* no superblock */
456 sb = kmap_atomic(bitmap->storage.sb_page);
457 sb->events = cpu_to_le64(bitmap->mddev->events);
458 if (bitmap->mddev->events < bitmap->events_cleared)
459 /* rocking back to read-only */
460 bitmap->events_cleared = bitmap->mddev->events;
461 sb->events_cleared = cpu_to_le64(bitmap->events_cleared);
462 sb->state = cpu_to_le32(bitmap->flags);
463 /* Just in case these have been changed via sysfs: */
464 sb->daemon_sleep = cpu_to_le32(bitmap->mddev->bitmap_info.daemon_sleep/HZ);
465 sb->write_behind = cpu_to_le32(bitmap->mddev->bitmap_info.max_write_behind);
466 /* This might have been changed by a reshape */
467 sb->sync_size = cpu_to_le64(bitmap->mddev->resync_max_sectors);
468 sb->chunksize = cpu_to_le32(bitmap->mddev->bitmap_info.chunksize);
469 sb->nodes = cpu_to_le32(bitmap->mddev->bitmap_info.nodes);
470 sb->sectors_reserved = cpu_to_le32(bitmap->mddev->
473 write_page(bitmap, bitmap->storage.sb_page, 1);
475 EXPORT_SYMBOL(bitmap_update_sb);
477 /* print out the bitmap file superblock */
478 void bitmap_print_sb(struct bitmap *bitmap)
482 if (!bitmap || !bitmap->storage.sb_page)
484 sb = kmap_atomic(bitmap->storage.sb_page);
485 pr_debug("%s: bitmap file superblock:\n", bmname(bitmap));
486 pr_debug(" magic: %08x\n", le32_to_cpu(sb->magic));
487 pr_debug(" version: %d\n", le32_to_cpu(sb->version));
488 pr_debug(" uuid: %08x.%08x.%08x.%08x\n",
489 le32_to_cpu(*(__u32 *)(sb->uuid+0)),
490 le32_to_cpu(*(__u32 *)(sb->uuid+4)),
491 le32_to_cpu(*(__u32 *)(sb->uuid+8)),
492 le32_to_cpu(*(__u32 *)(sb->uuid+12)));
493 pr_debug(" events: %llu\n",
494 (unsigned long long) le64_to_cpu(sb->events));
495 pr_debug("events cleared: %llu\n",
496 (unsigned long long) le64_to_cpu(sb->events_cleared));
497 pr_debug(" state: %08x\n", le32_to_cpu(sb->state));
498 pr_debug(" chunksize: %d B\n", le32_to_cpu(sb->chunksize));
499 pr_debug(" daemon sleep: %ds\n", le32_to_cpu(sb->daemon_sleep));
500 pr_debug(" sync size: %llu KB\n",
501 (unsigned long long)le64_to_cpu(sb->sync_size)/2);
502 pr_debug("max write behind: %d\n", le32_to_cpu(sb->write_behind));
510 * This function is somewhat the reverse of bitmap_read_sb. bitmap_read_sb
511 * reads and verifies the on-disk bitmap superblock and populates bitmap_info.
512 * This function verifies 'bitmap_info' and populates the on-disk bitmap
513 * structure, which is to be written to disk.
515 * Returns: 0 on success, -Exxx on error
517 static int bitmap_new_disk_sb(struct bitmap *bitmap)
520 unsigned long chunksize, daemon_sleep, write_behind;
522 bitmap->storage.sb_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
523 if (bitmap->storage.sb_page == NULL)
525 bitmap->storage.sb_page->index = 0;
527 sb = kmap_atomic(bitmap->storage.sb_page);
529 sb->magic = cpu_to_le32(BITMAP_MAGIC);
530 sb->version = cpu_to_le32(BITMAP_MAJOR_HI);
532 chunksize = bitmap->mddev->bitmap_info.chunksize;
534 if (!is_power_of_2(chunksize)) {
536 pr_warn("bitmap chunksize not a power of 2\n");
539 sb->chunksize = cpu_to_le32(chunksize);
541 daemon_sleep = bitmap->mddev->bitmap_info.daemon_sleep;
542 if (!daemon_sleep || (daemon_sleep > MAX_SCHEDULE_TIMEOUT)) {
543 pr_debug("Choosing daemon_sleep default (5 sec)\n");
544 daemon_sleep = 5 * HZ;
546 sb->daemon_sleep = cpu_to_le32(daemon_sleep);
547 bitmap->mddev->bitmap_info.daemon_sleep = daemon_sleep;
550 * FIXME: write_behind for RAID1. If not specified, what
551 * is a good choice? We choose COUNTER_MAX / 2 arbitrarily.
553 write_behind = bitmap->mddev->bitmap_info.max_write_behind;
554 if (write_behind > COUNTER_MAX)
555 write_behind = COUNTER_MAX / 2;
556 sb->write_behind = cpu_to_le32(write_behind);
557 bitmap->mddev->bitmap_info.max_write_behind = write_behind;
559 /* keep the array size field of the bitmap superblock up to date */
560 sb->sync_size = cpu_to_le64(bitmap->mddev->resync_max_sectors);
562 memcpy(sb->uuid, bitmap->mddev->uuid, 16);
564 set_bit(BITMAP_STALE, &bitmap->flags);
565 sb->state = cpu_to_le32(bitmap->flags);
566 bitmap->events_cleared = bitmap->mddev->events;
567 sb->events_cleared = cpu_to_le64(bitmap->mddev->events);
568 bitmap->mddev->bitmap_info.nodes = 0;
575 /* read the superblock from the bitmap file and initialize some bitmap fields */
576 static int bitmap_read_sb(struct bitmap *bitmap)
580 unsigned long chunksize, daemon_sleep, write_behind;
581 unsigned long long events;
583 unsigned long sectors_reserved = 0;
585 struct page *sb_page;
586 loff_t offset = bitmap->mddev->bitmap_info.offset;
588 if (!bitmap->storage.file && !bitmap->mddev->bitmap_info.offset) {
589 chunksize = 128 * 1024 * 1024;
590 daemon_sleep = 5 * HZ;
592 set_bit(BITMAP_STALE, &bitmap->flags);
596 /* page 0 is the superblock, read it... */
597 sb_page = alloc_page(GFP_KERNEL);
600 bitmap->storage.sb_page = sb_page;
603 /* If cluster_slot is set, the cluster is setup */
604 if (bitmap->cluster_slot >= 0) {
605 sector_t bm_blocks = bitmap->mddev->resync_max_sectors;
607 sector_div(bm_blocks,
608 bitmap->mddev->bitmap_info.chunksize >> 9);
610 bm_blocks = ((bm_blocks+7) >> 3) + sizeof(bitmap_super_t);
612 bm_blocks = DIV_ROUND_UP_SECTOR_T(bm_blocks, 4096);
613 offset = bitmap->mddev->bitmap_info.offset + (bitmap->cluster_slot * (bm_blocks << 3));
614 pr_debug("%s:%d bm slot: %d offset: %llu\n", __func__, __LINE__,
615 bitmap->cluster_slot, offset);
618 if (bitmap->storage.file) {
619 loff_t isize = i_size_read(bitmap->storage.file->f_mapping->host);
620 int bytes = isize > PAGE_SIZE ? PAGE_SIZE : isize;
622 err = read_page(bitmap->storage.file, 0,
623 bitmap, bytes, sb_page);
625 err = read_sb_page(bitmap->mddev,
634 sb = kmap_atomic(sb_page);
636 chunksize = le32_to_cpu(sb->chunksize);
637 daemon_sleep = le32_to_cpu(sb->daemon_sleep) * HZ;
638 write_behind = le32_to_cpu(sb->write_behind);
639 sectors_reserved = le32_to_cpu(sb->sectors_reserved);
640 /* Setup nodes/clustername only if bitmap version is
643 if (sb->version == cpu_to_le32(BITMAP_MAJOR_CLUSTERED)) {
644 nodes = le32_to_cpu(sb->nodes);
645 strlcpy(bitmap->mddev->bitmap_info.cluster_name,
646 sb->cluster_name, 64);
649 /* verify that the bitmap-specific fields are valid */
650 if (sb->magic != cpu_to_le32(BITMAP_MAGIC))
651 reason = "bad magic";
652 else if (le32_to_cpu(sb->version) < BITMAP_MAJOR_LO ||
653 le32_to_cpu(sb->version) > BITMAP_MAJOR_CLUSTERED)
654 reason = "unrecognized superblock version";
655 else if (chunksize < 512)
656 reason = "bitmap chunksize too small";
657 else if (!is_power_of_2(chunksize))
658 reason = "bitmap chunksize not a power of 2";
659 else if (daemon_sleep < 1 || daemon_sleep > MAX_SCHEDULE_TIMEOUT)
660 reason = "daemon sleep period out of range";
661 else if (write_behind > COUNTER_MAX)
662 reason = "write-behind limit out of range (0 - 16383)";
664 pr_warn("%s: invalid bitmap file superblock: %s\n",
665 bmname(bitmap), reason);
669 /* keep the array size field of the bitmap superblock up to date */
670 sb->sync_size = cpu_to_le64(bitmap->mddev->resync_max_sectors);
672 if (bitmap->mddev->persistent) {
674 * We have a persistent array superblock, so compare the
675 * bitmap's UUID and event counter to the mddev's
677 if (memcmp(sb->uuid, bitmap->mddev->uuid, 16)) {
678 pr_warn("%s: bitmap superblock UUID mismatch\n",
682 events = le64_to_cpu(sb->events);
683 if (!nodes && (events < bitmap->mddev->events)) {
684 pr_warn("%s: bitmap file is out of date (%llu < %llu) -- forcing full recovery\n",
685 bmname(bitmap), events,
686 (unsigned long long) bitmap->mddev->events);
687 set_bit(BITMAP_STALE, &bitmap->flags);
691 /* assign fields using values from superblock */
692 bitmap->flags |= le32_to_cpu(sb->state);
693 if (le32_to_cpu(sb->version) == BITMAP_MAJOR_HOSTENDIAN)
694 set_bit(BITMAP_HOSTENDIAN, &bitmap->flags);
695 bitmap->events_cleared = le64_to_cpu(sb->events_cleared);
696 strlcpy(bitmap->mddev->bitmap_info.cluster_name, sb->cluster_name, 64);
701 /* Assigning chunksize is required for "re_read" */
702 bitmap->mddev->bitmap_info.chunksize = chunksize;
703 if (err == 0 && nodes && (bitmap->cluster_slot < 0)) {
704 err = md_setup_cluster(bitmap->mddev, nodes);
706 pr_warn("%s: Could not setup cluster service (%d)\n",
707 bmname(bitmap), err);
710 bitmap->cluster_slot = md_cluster_ops->slot_number(bitmap->mddev);
716 if (test_bit(BITMAP_STALE, &bitmap->flags))
717 bitmap->events_cleared = bitmap->mddev->events;
718 bitmap->mddev->bitmap_info.chunksize = chunksize;
719 bitmap->mddev->bitmap_info.daemon_sleep = daemon_sleep;
720 bitmap->mddev->bitmap_info.max_write_behind = write_behind;
721 bitmap->mddev->bitmap_info.nodes = nodes;
722 if (bitmap->mddev->bitmap_info.space == 0 ||
723 bitmap->mddev->bitmap_info.space > sectors_reserved)
724 bitmap->mddev->bitmap_info.space = sectors_reserved;
726 bitmap_print_sb(bitmap);
727 if (bitmap->cluster_slot < 0)
728 md_cluster_stop(bitmap->mddev);
734 * general bitmap file operations
740 * Use one bit per "chunk" (block set). We do the disk I/O on the bitmap
741 * file a page at a time. There's a superblock at the start of the file.
743 /* calculate the index of the page that contains this bit */
744 static inline unsigned long file_page_index(struct bitmap_storage *store,
748 chunk += sizeof(bitmap_super_t) << 3;
749 return chunk >> PAGE_BIT_SHIFT;
752 /* calculate the (bit) offset of this bit within a page */
753 static inline unsigned long file_page_offset(struct bitmap_storage *store,
757 chunk += sizeof(bitmap_super_t) << 3;
758 return chunk & (PAGE_BITS - 1);
762 * return a pointer to the page in the filemap that contains the given bit
765 static inline struct page *filemap_get_page(struct bitmap_storage *store,
768 if (file_page_index(store, chunk) >= store->file_pages)
770 return store->filemap[file_page_index(store, chunk)];
773 static int bitmap_storage_alloc(struct bitmap_storage *store,
774 unsigned long chunks, int with_super,
777 int pnum, offset = 0;
778 unsigned long num_pages;
781 bytes = DIV_ROUND_UP(chunks, 8);
783 bytes += sizeof(bitmap_super_t);
785 num_pages = DIV_ROUND_UP(bytes, PAGE_SIZE);
786 offset = slot_number * num_pages;
788 store->filemap = kmalloc(sizeof(struct page *)
789 * num_pages, GFP_KERNEL);
793 if (with_super && !store->sb_page) {
794 store->sb_page = alloc_page(GFP_KERNEL|__GFP_ZERO);
795 if (store->sb_page == NULL)
800 if (store->sb_page) {
801 store->filemap[0] = store->sb_page;
803 store->sb_page->index = offset;
806 for ( ; pnum < num_pages; pnum++) {
807 store->filemap[pnum] = alloc_page(GFP_KERNEL|__GFP_ZERO);
808 if (!store->filemap[pnum]) {
809 store->file_pages = pnum;
812 store->filemap[pnum]->index = pnum + offset;
814 store->file_pages = pnum;
816 /* We need 4 bits per page, rounded up to a multiple
817 * of sizeof(unsigned long) */
818 store->filemap_attr = kzalloc(
819 roundup(DIV_ROUND_UP(num_pages*4, 8), sizeof(unsigned long)),
821 if (!store->filemap_attr)
824 store->bytes = bytes;
829 static void bitmap_file_unmap(struct bitmap_storage *store)
831 struct page **map, *sb_page;
836 map = store->filemap;
837 pages = store->file_pages;
838 sb_page = store->sb_page;
841 if (map[pages] != sb_page) /* 0 is sb_page, release it below */
842 free_buffers(map[pages]);
844 kfree(store->filemap_attr);
847 free_buffers(sb_page);
850 struct inode *inode = file_inode(file);
851 invalidate_mapping_pages(inode->i_mapping, 0, -1);
857 * bitmap_file_kick - if an error occurs while manipulating the bitmap file
858 * then it is no longer reliable, so we stop using it and we mark the file
859 * as failed in the superblock
861 static void bitmap_file_kick(struct bitmap *bitmap)
863 char *path, *ptr = NULL;
865 if (!test_and_set_bit(BITMAP_STALE, &bitmap->flags)) {
866 bitmap_update_sb(bitmap);
868 if (bitmap->storage.file) {
869 path = kmalloc(PAGE_SIZE, GFP_KERNEL);
871 ptr = file_path(bitmap->storage.file,
874 pr_warn("%s: kicking failed bitmap file %s from array!\n",
875 bmname(bitmap), IS_ERR(ptr) ? "" : ptr);
879 pr_warn("%s: disabling internal bitmap due to errors\n",
884 enum bitmap_page_attr {
885 BITMAP_PAGE_DIRTY = 0, /* there are set bits that need to be synced */
886 BITMAP_PAGE_PENDING = 1, /* there are bits that are being cleaned.
887 * i.e. counter is 1 or 2. */
888 BITMAP_PAGE_NEEDWRITE = 2, /* there are cleared bits that need to be synced */
891 static inline void set_page_attr(struct bitmap *bitmap, int pnum,
892 enum bitmap_page_attr attr)
894 set_bit((pnum<<2) + attr, bitmap->storage.filemap_attr);
897 static inline void clear_page_attr(struct bitmap *bitmap, int pnum,
898 enum bitmap_page_attr attr)
900 clear_bit((pnum<<2) + attr, bitmap->storage.filemap_attr);
903 static inline int test_page_attr(struct bitmap *bitmap, int pnum,
904 enum bitmap_page_attr attr)
906 return test_bit((pnum<<2) + attr, bitmap->storage.filemap_attr);
909 static inline int test_and_clear_page_attr(struct bitmap *bitmap, int pnum,
910 enum bitmap_page_attr attr)
912 return test_and_clear_bit((pnum<<2) + attr,
913 bitmap->storage.filemap_attr);
916 * bitmap_file_set_bit -- called before performing a write to the md device
917 * to set (and eventually sync) a particular bit in the bitmap file
919 * we set the bit immediately, then we record the page number so that
920 * when an unplug occurs, we can flush the dirty pages out to disk
922 static void bitmap_file_set_bit(struct bitmap *bitmap, sector_t block)
927 unsigned long chunk = block >> bitmap->counts.chunkshift;
928 struct bitmap_storage *store = &bitmap->storage;
929 unsigned long node_offset = 0;
931 if (mddev_is_clustered(bitmap->mddev))
932 node_offset = bitmap->cluster_slot * store->file_pages;
934 page = filemap_get_page(&bitmap->storage, chunk);
937 bit = file_page_offset(&bitmap->storage, chunk);
940 kaddr = kmap_atomic(page);
941 if (test_bit(BITMAP_HOSTENDIAN, &bitmap->flags))
944 set_bit_le(bit, kaddr);
945 kunmap_atomic(kaddr);
946 pr_debug("set file bit %lu page %lu\n", bit, page->index);
947 /* record page number so it gets flushed to disk when unplug occurs */
948 set_page_attr(bitmap, page->index - node_offset, BITMAP_PAGE_DIRTY);
951 static void bitmap_file_clear_bit(struct bitmap *bitmap, sector_t block)
956 unsigned long chunk = block >> bitmap->counts.chunkshift;
957 struct bitmap_storage *store = &bitmap->storage;
958 unsigned long node_offset = 0;
960 if (mddev_is_clustered(bitmap->mddev))
961 node_offset = bitmap->cluster_slot * store->file_pages;
963 page = filemap_get_page(&bitmap->storage, chunk);
966 bit = file_page_offset(&bitmap->storage, chunk);
967 paddr = kmap_atomic(page);
968 if (test_bit(BITMAP_HOSTENDIAN, &bitmap->flags))
969 clear_bit(bit, paddr);
971 clear_bit_le(bit, paddr);
972 kunmap_atomic(paddr);
973 if (!test_page_attr(bitmap, page->index - node_offset, BITMAP_PAGE_NEEDWRITE)) {
974 set_page_attr(bitmap, page->index - node_offset, BITMAP_PAGE_PENDING);
975 bitmap->allclean = 0;
979 static int bitmap_file_test_bit(struct bitmap *bitmap, sector_t block)
984 unsigned long chunk = block >> bitmap->counts.chunkshift;
987 page = filemap_get_page(&bitmap->storage, chunk);
990 bit = file_page_offset(&bitmap->storage, chunk);
991 paddr = kmap_atomic(page);
992 if (test_bit(BITMAP_HOSTENDIAN, &bitmap->flags))
993 set = test_bit(bit, paddr);
995 set = test_bit_le(bit, paddr);
996 kunmap_atomic(paddr);
1001 /* this gets called when the md device is ready to unplug its underlying
1002 * (slave) device queues -- before we let any writes go down, we need to
1003 * sync the dirty pages of the bitmap file to disk */
1004 void bitmap_unplug(struct bitmap *bitmap)
1007 int dirty, need_write;
1010 if (!bitmap || !bitmap->storage.filemap ||
1011 test_bit(BITMAP_STALE, &bitmap->flags))
1014 /* look at each page to see if there are any set bits that need to be
1015 * flushed out to disk */
1016 for (i = 0; i < bitmap->storage.file_pages; i++) {
1017 if (!bitmap->storage.filemap)
1019 dirty = test_and_clear_page_attr(bitmap, i, BITMAP_PAGE_DIRTY);
1020 need_write = test_and_clear_page_attr(bitmap, i,
1021 BITMAP_PAGE_NEEDWRITE);
1022 if (dirty || need_write) {
1024 bitmap_wait_writes(bitmap);
1025 if (bitmap->mddev->queue)
1026 blk_add_trace_msg(bitmap->mddev->queue,
1027 "md bitmap_unplug");
1029 clear_page_attr(bitmap, i, BITMAP_PAGE_PENDING);
1030 write_page(bitmap, bitmap->storage.filemap[i], 0);
1035 bitmap_wait_writes(bitmap);
1037 if (test_bit(BITMAP_WRITE_ERROR, &bitmap->flags))
1038 bitmap_file_kick(bitmap);
1040 EXPORT_SYMBOL(bitmap_unplug);
1042 static void bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset, int needed);
1043 /* * bitmap_init_from_disk -- called at bitmap_create time to initialize
1044 * the in-memory bitmap from the on-disk bitmap -- also, sets up the
1045 * memory mapping of the bitmap file
1047 * if there's no bitmap file, or if the bitmap file had been
1048 * previously kicked from the array, we mark all the bits as
1049 * 1's in order to cause a full resync.
1051 * We ignore all bits for sectors that end earlier than 'start'.
1052 * This is used when reading an out-of-date bitmap...
1054 static int bitmap_init_from_disk(struct bitmap *bitmap, sector_t start)
1056 unsigned long i, chunks, index, oldindex, bit, node_offset = 0;
1057 struct page *page = NULL;
1058 unsigned long bit_cnt = 0;
1060 unsigned long offset;
1064 struct bitmap_storage *store = &bitmap->storage;
1066 chunks = bitmap->counts.chunks;
1069 if (!file && !bitmap->mddev->bitmap_info.offset) {
1070 /* No permanent bitmap - fill with '1s'. */
1071 store->filemap = NULL;
1072 store->file_pages = 0;
1073 for (i = 0; i < chunks ; i++) {
1074 /* if the disk bit is set, set the memory bit */
1075 int needed = ((sector_t)(i+1) << (bitmap->counts.chunkshift)
1077 bitmap_set_memory_bits(bitmap,
1078 (sector_t)i << bitmap->counts.chunkshift,
1084 outofdate = test_bit(BITMAP_STALE, &bitmap->flags);
1086 pr_warn("%s: bitmap file is out of date, doing full recovery\n", bmname(bitmap));
1088 if (file && i_size_read(file->f_mapping->host) < store->bytes) {
1089 pr_warn("%s: bitmap file too short %lu < %lu\n",
1091 (unsigned long) i_size_read(file->f_mapping->host),
1098 if (!bitmap->mddev->bitmap_info.external)
1099 offset = sizeof(bitmap_super_t);
1101 if (mddev_is_clustered(bitmap->mddev))
1102 node_offset = bitmap->cluster_slot * (DIV_ROUND_UP(store->bytes, PAGE_SIZE));
1104 for (i = 0; i < chunks; i++) {
1106 index = file_page_index(&bitmap->storage, i);
1107 bit = file_page_offset(&bitmap->storage, i);
1108 if (index != oldindex) { /* this is a new page, read it in */
1110 /* unmap the old page, we're done with it */
1111 if (index == store->file_pages-1)
1112 count = store->bytes - index * PAGE_SIZE;
1115 page = store->filemap[index];
1117 ret = read_page(file, index, bitmap,
1122 bitmap->mddev->bitmap_info.offset,
1124 index + node_offset, count);
1133 * if bitmap is out of date, dirty the
1134 * whole page and write it out
1136 paddr = kmap_atomic(page);
1137 memset(paddr + offset, 0xff,
1138 PAGE_SIZE - offset);
1139 kunmap_atomic(paddr);
1140 write_page(bitmap, page, 1);
1143 if (test_bit(BITMAP_WRITE_ERROR,
1148 paddr = kmap_atomic(page);
1149 if (test_bit(BITMAP_HOSTENDIAN, &bitmap->flags))
1150 b = test_bit(bit, paddr);
1152 b = test_bit_le(bit, paddr);
1153 kunmap_atomic(paddr);
1155 /* if the disk bit is set, set the memory bit */
1156 int needed = ((sector_t)(i+1) << bitmap->counts.chunkshift
1158 bitmap_set_memory_bits(bitmap,
1159 (sector_t)i << bitmap->counts.chunkshift,
1166 pr_debug("%s: bitmap initialized from disk: read %lu pages, set %lu of %lu bits\n",
1167 bmname(bitmap), store->file_pages,
1173 pr_warn("%s: bitmap initialisation failed: %d\n",
1174 bmname(bitmap), ret);
1178 void bitmap_write_all(struct bitmap *bitmap)
1180 /* We don't actually write all bitmap blocks here,
1181 * just flag them as needing to be written
1185 if (!bitmap || !bitmap->storage.filemap)
1187 if (bitmap->storage.file)
1188 /* Only one copy, so nothing needed */
1191 for (i = 0; i < bitmap->storage.file_pages; i++)
1192 set_page_attr(bitmap, i,
1193 BITMAP_PAGE_NEEDWRITE);
1194 bitmap->allclean = 0;
1197 static void bitmap_count_page(struct bitmap_counts *bitmap,
1198 sector_t offset, int inc)
1200 sector_t chunk = offset >> bitmap->chunkshift;
1201 unsigned long page = chunk >> PAGE_COUNTER_SHIFT;
1202 bitmap->bp[page].count += inc;
1203 bitmap_checkfree(bitmap, page);
1206 static void bitmap_set_pending(struct bitmap_counts *bitmap, sector_t offset)
1208 sector_t chunk = offset >> bitmap->chunkshift;
1209 unsigned long page = chunk >> PAGE_COUNTER_SHIFT;
1210 struct bitmap_page *bp = &bitmap->bp[page];
1216 static bitmap_counter_t *bitmap_get_counter(struct bitmap_counts *bitmap,
1217 sector_t offset, sector_t *blocks,
1221 * bitmap daemon -- periodically wakes up to clean bits and flush pages
1225 void bitmap_daemon_work(struct mddev *mddev)
1227 struct bitmap *bitmap;
1229 unsigned long nextpage;
1231 struct bitmap_counts *counts;
1233 /* Use a mutex to guard daemon_work against
1236 mutex_lock(&mddev->bitmap_info.mutex);
1237 bitmap = mddev->bitmap;
1238 if (bitmap == NULL) {
1239 mutex_unlock(&mddev->bitmap_info.mutex);
1242 if (time_before(jiffies, bitmap->daemon_lastrun
1243 + mddev->bitmap_info.daemon_sleep))
1246 bitmap->daemon_lastrun = jiffies;
1247 if (bitmap->allclean) {
1248 mddev->thread->timeout = MAX_SCHEDULE_TIMEOUT;
1251 bitmap->allclean = 1;
1253 if (bitmap->mddev->queue)
1254 blk_add_trace_msg(bitmap->mddev->queue,
1255 "md bitmap_daemon_work");
1257 /* Any file-page which is PENDING now needs to be written.
1258 * So set NEEDWRITE now, then after we make any last-minute changes
1261 for (j = 0; j < bitmap->storage.file_pages; j++)
1262 if (test_and_clear_page_attr(bitmap, j,
1263 BITMAP_PAGE_PENDING))
1264 set_page_attr(bitmap, j,
1265 BITMAP_PAGE_NEEDWRITE);
1267 if (bitmap->need_sync &&
1268 mddev->bitmap_info.external == 0) {
1269 /* Arrange for superblock update as well as
1272 bitmap->need_sync = 0;
1273 if (bitmap->storage.filemap) {
1274 sb = kmap_atomic(bitmap->storage.sb_page);
1275 sb->events_cleared =
1276 cpu_to_le64(bitmap->events_cleared);
1278 set_page_attr(bitmap, 0,
1279 BITMAP_PAGE_NEEDWRITE);
1282 /* Now look at the bitmap counters and if any are '2' or '1',
1283 * decrement and handle accordingly.
1285 counts = &bitmap->counts;
1286 spin_lock_irq(&counts->lock);
1288 for (j = 0; j < counts->chunks; j++) {
1289 bitmap_counter_t *bmc;
1290 sector_t block = (sector_t)j << counts->chunkshift;
1292 if (j == nextpage) {
1293 nextpage += PAGE_COUNTER_RATIO;
1294 if (!counts->bp[j >> PAGE_COUNTER_SHIFT].pending) {
1295 j |= PAGE_COUNTER_MASK;
1298 counts->bp[j >> PAGE_COUNTER_SHIFT].pending = 0;
1300 bmc = bitmap_get_counter(counts,
1305 j |= PAGE_COUNTER_MASK;
1308 if (*bmc == 1 && !bitmap->need_sync) {
1309 /* We can clear the bit */
1311 bitmap_count_page(counts, block, -1);
1312 bitmap_file_clear_bit(bitmap, block);
1313 } else if (*bmc && *bmc <= 2) {
1315 bitmap_set_pending(counts, block);
1316 bitmap->allclean = 0;
1319 spin_unlock_irq(&counts->lock);
1321 bitmap_wait_writes(bitmap);
1322 /* Now start writeout on any page in NEEDWRITE that isn't DIRTY.
1323 * DIRTY pages need to be written by bitmap_unplug so it can wait
1325 * If we find any DIRTY page we stop there and let bitmap_unplug
1326 * handle all the rest. This is important in the case where
1327 * the first blocking holds the superblock and it has been updated.
1328 * We mustn't write any other blocks before the superblock.
1331 j < bitmap->storage.file_pages
1332 && !test_bit(BITMAP_STALE, &bitmap->flags);
1334 if (test_page_attr(bitmap, j,
1336 /* bitmap_unplug will handle the rest */
1338 if (test_and_clear_page_attr(bitmap, j,
1339 BITMAP_PAGE_NEEDWRITE)) {
1340 write_page(bitmap, bitmap->storage.filemap[j], 0);
1345 if (bitmap->allclean == 0)
1346 mddev->thread->timeout =
1347 mddev->bitmap_info.daemon_sleep;
1348 mutex_unlock(&mddev->bitmap_info.mutex);
1351 static bitmap_counter_t *bitmap_get_counter(struct bitmap_counts *bitmap,
1352 sector_t offset, sector_t *blocks,
1354 __releases(bitmap->lock)
1355 __acquires(bitmap->lock)
1357 /* If 'create', we might release the lock and reclaim it.
1358 * The lock must have been taken with interrupts enabled.
1359 * If !create, we don't release the lock.
1361 sector_t chunk = offset >> bitmap->chunkshift;
1362 unsigned long page = chunk >> PAGE_COUNTER_SHIFT;
1363 unsigned long pageoff = (chunk & PAGE_COUNTER_MASK) << COUNTER_BYTE_SHIFT;
1367 err = bitmap_checkpage(bitmap, page, create, 0);
1369 if (bitmap->bp[page].hijacked ||
1370 bitmap->bp[page].map == NULL)
1371 csize = ((sector_t)1) << (bitmap->chunkshift +
1372 PAGE_COUNTER_SHIFT - 1);
1374 csize = ((sector_t)1) << bitmap->chunkshift;
1375 *blocks = csize - (offset & (csize - 1));
1380 /* now locked ... */
1382 if (bitmap->bp[page].hijacked) { /* hijacked pointer */
1383 /* should we use the first or second counter field
1384 * of the hijacked pointer? */
1385 int hi = (pageoff > PAGE_COUNTER_MASK);
1386 return &((bitmap_counter_t *)
1387 &bitmap->bp[page].map)[hi];
1388 } else /* page is allocated */
1389 return (bitmap_counter_t *)
1390 &(bitmap->bp[page].map[pageoff]);
1393 int bitmap_startwrite(struct bitmap *bitmap, sector_t offset, unsigned long sectors, int behind)
1400 atomic_inc(&bitmap->behind_writes);
1401 bw = atomic_read(&bitmap->behind_writes);
1402 if (bw > bitmap->behind_writes_used)
1403 bitmap->behind_writes_used = bw;
1405 pr_debug("inc write-behind count %d/%lu\n",
1406 bw, bitmap->mddev->bitmap_info.max_write_behind);
1411 bitmap_counter_t *bmc;
1413 spin_lock_irq(&bitmap->counts.lock);
1414 bmc = bitmap_get_counter(&bitmap->counts, offset, &blocks, 1);
1416 spin_unlock_irq(&bitmap->counts.lock);
1420 if (unlikely(COUNTER(*bmc) == COUNTER_MAX)) {
1421 DEFINE_WAIT(__wait);
1422 /* note that it is safe to do the prepare_to_wait
1423 * after the test as long as we do it before dropping
1426 prepare_to_wait(&bitmap->overflow_wait, &__wait,
1427 TASK_UNINTERRUPTIBLE);
1428 spin_unlock_irq(&bitmap->counts.lock);
1430 finish_wait(&bitmap->overflow_wait, &__wait);
1436 bitmap_file_set_bit(bitmap, offset);
1437 bitmap_count_page(&bitmap->counts, offset, 1);
1445 spin_unlock_irq(&bitmap->counts.lock);
1448 if (sectors > blocks)
1455 EXPORT_SYMBOL(bitmap_startwrite);
1457 void bitmap_endwrite(struct bitmap *bitmap, sector_t offset, unsigned long sectors,
1458 int success, int behind)
1463 if (atomic_dec_and_test(&bitmap->behind_writes))
1464 wake_up(&bitmap->behind_wait);
1465 pr_debug("dec write-behind count %d/%lu\n",
1466 atomic_read(&bitmap->behind_writes),
1467 bitmap->mddev->bitmap_info.max_write_behind);
1472 unsigned long flags;
1473 bitmap_counter_t *bmc;
1475 spin_lock_irqsave(&bitmap->counts.lock, flags);
1476 bmc = bitmap_get_counter(&bitmap->counts, offset, &blocks, 0);
1478 spin_unlock_irqrestore(&bitmap->counts.lock, flags);
1482 if (success && !bitmap->mddev->degraded &&
1483 bitmap->events_cleared < bitmap->mddev->events) {
1484 bitmap->events_cleared = bitmap->mddev->events;
1485 bitmap->need_sync = 1;
1486 sysfs_notify_dirent_safe(bitmap->sysfs_can_clear);
1489 if (!success && !NEEDED(*bmc))
1490 *bmc |= NEEDED_MASK;
1492 if (COUNTER(*bmc) == COUNTER_MAX)
1493 wake_up(&bitmap->overflow_wait);
1497 bitmap_set_pending(&bitmap->counts, offset);
1498 bitmap->allclean = 0;
1500 spin_unlock_irqrestore(&bitmap->counts.lock, flags);
1502 if (sectors > blocks)
1508 EXPORT_SYMBOL(bitmap_endwrite);
1510 static int __bitmap_start_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks,
1513 bitmap_counter_t *bmc;
1515 if (bitmap == NULL) {/* FIXME or bitmap set as 'failed' */
1517 return 1; /* always resync if no bitmap */
1519 spin_lock_irq(&bitmap->counts.lock);
1520 bmc = bitmap_get_counter(&bitmap->counts, offset, blocks, 0);
1526 else if (NEEDED(*bmc)) {
1528 if (!degraded) { /* don't set/clear bits if degraded */
1529 *bmc |= RESYNC_MASK;
1530 *bmc &= ~NEEDED_MASK;
1534 spin_unlock_irq(&bitmap->counts.lock);
1538 int bitmap_start_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks,
1541 /* bitmap_start_sync must always report on multiples of whole
1542 * pages, otherwise resync (which is very PAGE_SIZE based) will
1544 * So call __bitmap_start_sync repeatedly (if needed) until
1545 * At least PAGE_SIZE>>9 blocks are covered.
1546 * Return the 'or' of the result.
1552 while (*blocks < (PAGE_SIZE>>9)) {
1553 rv |= __bitmap_start_sync(bitmap, offset,
1554 &blocks1, degraded);
1560 EXPORT_SYMBOL(bitmap_start_sync);
1562 void bitmap_end_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks, int aborted)
1564 bitmap_counter_t *bmc;
1565 unsigned long flags;
1567 if (bitmap == NULL) {
1571 spin_lock_irqsave(&bitmap->counts.lock, flags);
1572 bmc = bitmap_get_counter(&bitmap->counts, offset, blocks, 0);
1577 *bmc &= ~RESYNC_MASK;
1579 if (!NEEDED(*bmc) && aborted)
1580 *bmc |= NEEDED_MASK;
1583 bitmap_set_pending(&bitmap->counts, offset);
1584 bitmap->allclean = 0;
1589 spin_unlock_irqrestore(&bitmap->counts.lock, flags);
1591 EXPORT_SYMBOL(bitmap_end_sync);
1593 void bitmap_close_sync(struct bitmap *bitmap)
1595 /* Sync has finished, and any bitmap chunks that weren't synced
1596 * properly have been aborted. It remains to us to clear the
1597 * RESYNC bit wherever it is still on
1599 sector_t sector = 0;
1603 while (sector < bitmap->mddev->resync_max_sectors) {
1604 bitmap_end_sync(bitmap, sector, &blocks, 0);
1608 EXPORT_SYMBOL(bitmap_close_sync);
1610 void bitmap_cond_end_sync(struct bitmap *bitmap, sector_t sector, bool force)
1618 bitmap->last_end_sync = jiffies;
1621 if (!force && time_before(jiffies, (bitmap->last_end_sync
1622 + bitmap->mddev->bitmap_info.daemon_sleep)))
1624 wait_event(bitmap->mddev->recovery_wait,
1625 atomic_read(&bitmap->mddev->recovery_active) == 0);
1627 bitmap->mddev->curr_resync_completed = sector;
1628 set_bit(MD_SB_CHANGE_CLEAN, &bitmap->mddev->sb_flags);
1629 sector &= ~((1ULL << bitmap->counts.chunkshift) - 1);
1631 while (s < sector && s < bitmap->mddev->resync_max_sectors) {
1632 bitmap_end_sync(bitmap, s, &blocks, 0);
1635 bitmap->last_end_sync = jiffies;
1636 sysfs_notify(&bitmap->mddev->kobj, NULL, "sync_completed");
1638 EXPORT_SYMBOL(bitmap_cond_end_sync);
1640 void bitmap_sync_with_cluster(struct mddev *mddev,
1641 sector_t old_lo, sector_t old_hi,
1642 sector_t new_lo, sector_t new_hi)
1644 struct bitmap *bitmap = mddev->bitmap;
1645 sector_t sector, blocks = 0;
1647 for (sector = old_lo; sector < new_lo; ) {
1648 bitmap_end_sync(bitmap, sector, &blocks, 0);
1651 WARN((blocks > new_lo) && old_lo, "alignment is not correct for lo\n");
1653 for (sector = old_hi; sector < new_hi; ) {
1654 bitmap_start_sync(bitmap, sector, &blocks, 0);
1657 WARN((blocks > new_hi) && old_hi, "alignment is not correct for hi\n");
1659 EXPORT_SYMBOL(bitmap_sync_with_cluster);
1661 static void bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset, int needed)
1663 /* For each chunk covered by any of these sectors, set the
1664 * counter to 2 and possibly set resync_needed. They should all
1665 * be 0 at this point
1669 bitmap_counter_t *bmc;
1670 spin_lock_irq(&bitmap->counts.lock);
1671 bmc = bitmap_get_counter(&bitmap->counts, offset, &secs, 1);
1673 spin_unlock_irq(&bitmap->counts.lock);
1678 bitmap_count_page(&bitmap->counts, offset, 1);
1679 bitmap_set_pending(&bitmap->counts, offset);
1680 bitmap->allclean = 0;
1683 *bmc |= NEEDED_MASK;
1684 spin_unlock_irq(&bitmap->counts.lock);
1687 /* dirty the memory and file bits for bitmap chunks "s" to "e" */
1688 void bitmap_dirty_bits(struct bitmap *bitmap, unsigned long s, unsigned long e)
1690 unsigned long chunk;
1692 for (chunk = s; chunk <= e; chunk++) {
1693 sector_t sec = (sector_t)chunk << bitmap->counts.chunkshift;
1694 bitmap_set_memory_bits(bitmap, sec, 1);
1695 bitmap_file_set_bit(bitmap, sec);
1696 if (sec < bitmap->mddev->recovery_cp)
1697 /* We are asserting that the array is dirty,
1698 * so move the recovery_cp address back so
1699 * that it is obvious that it is dirty
1701 bitmap->mddev->recovery_cp = sec;
1706 * flush out any pending updates
1708 void bitmap_flush(struct mddev *mddev)
1710 struct bitmap *bitmap = mddev->bitmap;
1713 if (!bitmap) /* there was no bitmap */
1716 /* run the daemon_work three time to ensure everything is flushed
1719 sleep = mddev->bitmap_info.daemon_sleep * 2;
1720 bitmap->daemon_lastrun -= sleep;
1721 bitmap_daemon_work(mddev);
1722 bitmap->daemon_lastrun -= sleep;
1723 bitmap_daemon_work(mddev);
1724 bitmap->daemon_lastrun -= sleep;
1725 bitmap_daemon_work(mddev);
1726 bitmap_update_sb(bitmap);
1730 * free memory that was allocated
1732 void bitmap_free(struct bitmap *bitmap)
1734 unsigned long k, pages;
1735 struct bitmap_page *bp;
1737 if (!bitmap) /* there was no bitmap */
1740 if (bitmap->sysfs_can_clear)
1741 sysfs_put(bitmap->sysfs_can_clear);
1743 if (mddev_is_clustered(bitmap->mddev) && bitmap->mddev->cluster_info &&
1744 bitmap->cluster_slot == md_cluster_ops->slot_number(bitmap->mddev))
1745 md_cluster_stop(bitmap->mddev);
1747 /* Shouldn't be needed - but just in case.... */
1748 wait_event(bitmap->write_wait,
1749 atomic_read(&bitmap->pending_writes) == 0);
1751 /* release the bitmap file */
1752 bitmap_file_unmap(&bitmap->storage);
1754 bp = bitmap->counts.bp;
1755 pages = bitmap->counts.pages;
1757 /* free all allocated memory */
1759 if (bp) /* deallocate the page memory */
1760 for (k = 0; k < pages; k++)
1761 if (bp[k].map && !bp[k].hijacked)
1766 EXPORT_SYMBOL(bitmap_free);
1768 void bitmap_wait_behind_writes(struct mddev *mddev)
1770 struct bitmap *bitmap = mddev->bitmap;
1772 /* wait for behind writes to complete */
1773 if (bitmap && atomic_read(&bitmap->behind_writes) > 0) {
1774 pr_debug("md:%s: behind writes in progress - waiting to stop.\n",
1776 /* need to kick something here to make sure I/O goes? */
1777 wait_event(bitmap->behind_wait,
1778 atomic_read(&bitmap->behind_writes) == 0);
1782 void bitmap_destroy(struct mddev *mddev)
1784 struct bitmap *bitmap = mddev->bitmap;
1786 if (!bitmap) /* there was no bitmap */
1789 bitmap_wait_behind_writes(mddev);
1791 mutex_lock(&mddev->bitmap_info.mutex);
1792 spin_lock(&mddev->lock);
1793 mddev->bitmap = NULL; /* disconnect from the md device */
1794 spin_unlock(&mddev->lock);
1795 mutex_unlock(&mddev->bitmap_info.mutex);
1797 mddev->thread->timeout = MAX_SCHEDULE_TIMEOUT;
1799 bitmap_free(bitmap);
1803 * initialize the bitmap structure
1804 * if this returns an error, bitmap_destroy must be called to do clean up
1805 * once mddev->bitmap is set
1807 struct bitmap *bitmap_create(struct mddev *mddev, int slot)
1809 struct bitmap *bitmap;
1810 sector_t blocks = mddev->resync_max_sectors;
1811 struct file *file = mddev->bitmap_info.file;
1813 struct kernfs_node *bm = NULL;
1815 BUILD_BUG_ON(sizeof(bitmap_super_t) != 256);
1817 BUG_ON(file && mddev->bitmap_info.offset);
1819 bitmap = kzalloc(sizeof(*bitmap), GFP_KERNEL);
1821 return ERR_PTR(-ENOMEM);
1823 spin_lock_init(&bitmap->counts.lock);
1824 atomic_set(&bitmap->pending_writes, 0);
1825 init_waitqueue_head(&bitmap->write_wait);
1826 init_waitqueue_head(&bitmap->overflow_wait);
1827 init_waitqueue_head(&bitmap->behind_wait);
1829 bitmap->mddev = mddev;
1830 bitmap->cluster_slot = slot;
1833 bm = sysfs_get_dirent(mddev->kobj.sd, "bitmap");
1835 bitmap->sysfs_can_clear = sysfs_get_dirent(bm, "can_clear");
1838 bitmap->sysfs_can_clear = NULL;
1840 bitmap->storage.file = file;
1843 /* As future accesses to this file will use bmap,
1844 * and bypass the page cache, we must sync the file
1849 /* read superblock from bitmap file (this sets mddev->bitmap_info.chunksize) */
1850 if (!mddev->bitmap_info.external) {
1852 * If 'MD_ARRAY_FIRST_USE' is set, then device-mapper is
1853 * instructing us to create a new on-disk bitmap instance.
1855 if (test_and_clear_bit(MD_ARRAY_FIRST_USE, &mddev->flags))
1856 err = bitmap_new_disk_sb(bitmap);
1858 err = bitmap_read_sb(bitmap);
1861 if (mddev->bitmap_info.chunksize == 0 ||
1862 mddev->bitmap_info.daemon_sleep == 0)
1863 /* chunksize and time_base need to be
1870 bitmap->daemon_lastrun = jiffies;
1871 err = bitmap_resize(bitmap, blocks, mddev->bitmap_info.chunksize, 1);
1875 pr_debug("created bitmap (%lu pages) for device %s\n",
1876 bitmap->counts.pages, bmname(bitmap));
1878 err = test_bit(BITMAP_WRITE_ERROR, &bitmap->flags) ? -EIO : 0;
1884 bitmap_free(bitmap);
1885 return ERR_PTR(err);
1888 int bitmap_load(struct mddev *mddev)
1892 sector_t sector = 0;
1893 struct bitmap *bitmap = mddev->bitmap;
1898 if (mddev_is_clustered(mddev))
1899 md_cluster_ops->load_bitmaps(mddev, mddev->bitmap_info.nodes);
1901 /* Clear out old bitmap info first: Either there is none, or we
1902 * are resuming after someone else has possibly changed things,
1903 * so we should forget old cached info.
1904 * All chunks should be clean, but some might need_sync.
1906 while (sector < mddev->resync_max_sectors) {
1908 bitmap_start_sync(bitmap, sector, &blocks, 0);
1911 bitmap_close_sync(bitmap);
1913 if (mddev->degraded == 0
1914 || bitmap->events_cleared == mddev->events)
1915 /* no need to keep dirty bits to optimise a
1916 * re-add of a missing device */
1917 start = mddev->recovery_cp;
1919 mutex_lock(&mddev->bitmap_info.mutex);
1920 err = bitmap_init_from_disk(bitmap, start);
1921 mutex_unlock(&mddev->bitmap_info.mutex);
1925 clear_bit(BITMAP_STALE, &bitmap->flags);
1927 /* Kick recovery in case any bits were set */
1928 set_bit(MD_RECOVERY_NEEDED, &bitmap->mddev->recovery);
1930 mddev->thread->timeout = mddev->bitmap_info.daemon_sleep;
1931 md_wakeup_thread(mddev->thread);
1933 bitmap_update_sb(bitmap);
1935 if (test_bit(BITMAP_WRITE_ERROR, &bitmap->flags))
1940 EXPORT_SYMBOL_GPL(bitmap_load);
1942 struct bitmap *get_bitmap_from_slot(struct mddev *mddev, int slot)
1945 struct bitmap *bitmap;
1947 bitmap = bitmap_create(mddev, slot);
1948 if (IS_ERR(bitmap)) {
1949 rv = PTR_ERR(bitmap);
1953 rv = bitmap_init_from_disk(bitmap, 0);
1955 bitmap_free(bitmap);
1961 EXPORT_SYMBOL(get_bitmap_from_slot);
1963 /* Loads the bitmap associated with slot and copies the resync information
1966 int bitmap_copy_from_slot(struct mddev *mddev, int slot,
1967 sector_t *low, sector_t *high, bool clear_bits)
1970 sector_t block, lo = 0, hi = 0;
1971 struct bitmap_counts *counts;
1972 struct bitmap *bitmap;
1974 bitmap = get_bitmap_from_slot(mddev, slot);
1975 if (IS_ERR(bitmap)) {
1976 pr_err("%s can't get bitmap from slot %d\n", __func__, slot);
1980 counts = &bitmap->counts;
1981 for (j = 0; j < counts->chunks; j++) {
1982 block = (sector_t)j << counts->chunkshift;
1983 if (bitmap_file_test_bit(bitmap, block)) {
1987 bitmap_file_clear_bit(bitmap, block);
1988 bitmap_set_memory_bits(mddev->bitmap, block, 1);
1989 bitmap_file_set_bit(mddev->bitmap, block);
1994 bitmap_update_sb(bitmap);
1995 /* BITMAP_PAGE_PENDING is set, but bitmap_unplug needs
1996 * BITMAP_PAGE_DIRTY or _NEEDWRITE to write ... */
1997 for (i = 0; i < bitmap->storage.file_pages; i++)
1998 if (test_page_attr(bitmap, i, BITMAP_PAGE_PENDING))
1999 set_page_attr(bitmap, i, BITMAP_PAGE_NEEDWRITE);
2000 bitmap_unplug(bitmap);
2002 bitmap_unplug(mddev->bitmap);
2008 EXPORT_SYMBOL_GPL(bitmap_copy_from_slot);
2011 void bitmap_status(struct seq_file *seq, struct bitmap *bitmap)
2013 unsigned long chunk_kb;
2014 struct bitmap_counts *counts;
2019 counts = &bitmap->counts;
2021 chunk_kb = bitmap->mddev->bitmap_info.chunksize >> 10;
2022 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
2024 counts->pages - counts->missing_pages,
2026 (counts->pages - counts->missing_pages)
2027 << (PAGE_SHIFT - 10),
2028 chunk_kb ? chunk_kb : bitmap->mddev->bitmap_info.chunksize,
2029 chunk_kb ? "KB" : "B");
2030 if (bitmap->storage.file) {
2031 seq_printf(seq, ", file: ");
2032 seq_file_path(seq, bitmap->storage.file, " \t\n");
2035 seq_printf(seq, "\n");
2038 int bitmap_resize(struct bitmap *bitmap, sector_t blocks,
2039 int chunksize, int init)
2041 /* If chunk_size is 0, choose an appropriate chunk size.
2042 * Then possibly allocate new storage space.
2043 * Then quiesce, copy bits, replace bitmap, and re-start
2045 * This function is called both to set up the initial bitmap
2046 * and to resize the bitmap while the array is active.
2047 * If this happens as a result of the array being resized,
2048 * chunksize will be zero, and we need to choose a suitable
2049 * chunksize, otherwise we use what we are given.
2051 struct bitmap_storage store;
2052 struct bitmap_counts old_counts;
2053 unsigned long chunks;
2055 sector_t old_blocks, new_blocks;
2059 struct bitmap_page *new_bp;
2061 if (bitmap->storage.file && !init) {
2062 pr_info("md: cannot resize file-based bitmap\n");
2066 if (chunksize == 0) {
2067 /* If there is enough space, leave the chunk size unchanged,
2068 * else increase by factor of two until there is enough space.
2071 long space = bitmap->mddev->bitmap_info.space;
2074 /* We don't know how much space there is, so limit
2075 * to current size - in sectors.
2077 bytes = DIV_ROUND_UP(bitmap->counts.chunks, 8);
2078 if (!bitmap->mddev->bitmap_info.external)
2079 bytes += sizeof(bitmap_super_t);
2080 space = DIV_ROUND_UP(bytes, 512);
2081 bitmap->mddev->bitmap_info.space = space;
2083 chunkshift = bitmap->counts.chunkshift;
2086 /* 'chunkshift' is shift from block size to chunk size */
2088 chunks = DIV_ROUND_UP_SECTOR_T(blocks, 1 << chunkshift);
2089 bytes = DIV_ROUND_UP(chunks, 8);
2090 if (!bitmap->mddev->bitmap_info.external)
2091 bytes += sizeof(bitmap_super_t);
2092 } while (bytes > (space << 9));
2094 chunkshift = ffz(~chunksize) - BITMAP_BLOCK_SHIFT;
2096 chunks = DIV_ROUND_UP_SECTOR_T(blocks, 1 << chunkshift);
2097 memset(&store, 0, sizeof(store));
2098 if (bitmap->mddev->bitmap_info.offset || bitmap->mddev->bitmap_info.file)
2099 ret = bitmap_storage_alloc(&store, chunks,
2100 !bitmap->mddev->bitmap_info.external,
2101 mddev_is_clustered(bitmap->mddev)
2102 ? bitmap->cluster_slot : 0);
2104 bitmap_file_unmap(&store);
2108 pages = DIV_ROUND_UP(chunks, PAGE_COUNTER_RATIO);
2110 new_bp = kzalloc(pages * sizeof(*new_bp), GFP_KERNEL);
2113 bitmap_file_unmap(&store);
2118 bitmap->mddev->pers->quiesce(bitmap->mddev, 1);
2120 store.file = bitmap->storage.file;
2121 bitmap->storage.file = NULL;
2123 if (store.sb_page && bitmap->storage.sb_page)
2124 memcpy(page_address(store.sb_page),
2125 page_address(bitmap->storage.sb_page),
2127 bitmap_file_unmap(&bitmap->storage);
2128 bitmap->storage = store;
2130 old_counts = bitmap->counts;
2131 bitmap->counts.bp = new_bp;
2132 bitmap->counts.pages = pages;
2133 bitmap->counts.missing_pages = pages;
2134 bitmap->counts.chunkshift = chunkshift;
2135 bitmap->counts.chunks = chunks;
2136 bitmap->mddev->bitmap_info.chunksize = 1 << (chunkshift +
2137 BITMAP_BLOCK_SHIFT);
2139 blocks = min(old_counts.chunks << old_counts.chunkshift,
2140 chunks << chunkshift);
2142 spin_lock_irq(&bitmap->counts.lock);
2143 /* For cluster raid, need to pre-allocate bitmap */
2144 if (mddev_is_clustered(bitmap->mddev)) {
2146 for (page = 0; page < pages; page++) {
2147 ret = bitmap_checkpage(&bitmap->counts, page, 1, 1);
2151 /* deallocate the page memory */
2152 for (k = 0; k < page; k++) {
2153 kfree(new_bp[k].map);
2156 /* restore some fields from old_counts */
2157 bitmap->counts.bp = old_counts.bp;
2158 bitmap->counts.pages = old_counts.pages;
2159 bitmap->counts.missing_pages = old_counts.pages;
2160 bitmap->counts.chunkshift = old_counts.chunkshift;
2161 bitmap->counts.chunks = old_counts.chunks;
2162 bitmap->mddev->bitmap_info.chunksize = 1 << (old_counts.chunkshift +
2163 BITMAP_BLOCK_SHIFT);
2164 blocks = old_counts.chunks << old_counts.chunkshift;
2165 pr_warn("Could not pre-allocate in-memory bitmap for cluster raid\n");
2168 bitmap->counts.bp[page].count += 1;
2172 for (block = 0; block < blocks; ) {
2173 bitmap_counter_t *bmc_old, *bmc_new;
2176 bmc_old = bitmap_get_counter(&old_counts, block,
2178 set = bmc_old && NEEDED(*bmc_old);
2181 bmc_new = bitmap_get_counter(&bitmap->counts, block,
2183 if (*bmc_new == 0) {
2184 /* need to set on-disk bits too. */
2185 sector_t end = block + new_blocks;
2186 sector_t start = block >> chunkshift;
2187 start <<= chunkshift;
2188 while (start < end) {
2189 bitmap_file_set_bit(bitmap, block);
2190 start += 1 << chunkshift;
2193 bitmap_count_page(&bitmap->counts,
2195 bitmap_set_pending(&bitmap->counts,
2198 *bmc_new |= NEEDED_MASK;
2199 if (new_blocks < old_blocks)
2200 old_blocks = new_blocks;
2202 block += old_blocks;
2207 while (block < (chunks << chunkshift)) {
2208 bitmap_counter_t *bmc;
2209 bmc = bitmap_get_counter(&bitmap->counts, block,
2212 /* new space. It needs to be resynced, so
2213 * we set NEEDED_MASK.
2216 *bmc = NEEDED_MASK | 2;
2217 bitmap_count_page(&bitmap->counts,
2219 bitmap_set_pending(&bitmap->counts,
2223 block += new_blocks;
2225 for (i = 0; i < bitmap->storage.file_pages; i++)
2226 set_page_attr(bitmap, i, BITMAP_PAGE_DIRTY);
2228 spin_unlock_irq(&bitmap->counts.lock);
2231 bitmap_unplug(bitmap);
2232 bitmap->mddev->pers->quiesce(bitmap->mddev, 0);
2238 EXPORT_SYMBOL_GPL(bitmap_resize);
2241 location_show(struct mddev *mddev, char *page)
2244 if (mddev->bitmap_info.file)
2245 len = sprintf(page, "file");
2246 else if (mddev->bitmap_info.offset)
2247 len = sprintf(page, "%+lld", (long long)mddev->bitmap_info.offset);
2249 len = sprintf(page, "none");
2250 len += sprintf(page+len, "\n");
2255 location_store(struct mddev *mddev, const char *buf, size_t len)
2259 rv = mddev_lock(mddev);
2263 if (!mddev->pers->quiesce) {
2267 if (mddev->recovery || mddev->sync_thread) {
2273 if (mddev->bitmap || mddev->bitmap_info.file ||
2274 mddev->bitmap_info.offset) {
2275 /* bitmap already configured. Only option is to clear it */
2276 if (strncmp(buf, "none", 4) != 0) {
2281 mddev->pers->quiesce(mddev, 1);
2282 bitmap_destroy(mddev);
2283 mddev->pers->quiesce(mddev, 0);
2285 mddev->bitmap_info.offset = 0;
2286 if (mddev->bitmap_info.file) {
2287 struct file *f = mddev->bitmap_info.file;
2288 mddev->bitmap_info.file = NULL;
2292 /* No bitmap, OK to set a location */
2294 if (strncmp(buf, "none", 4) == 0)
2295 /* nothing to be done */;
2296 else if (strncmp(buf, "file:", 5) == 0) {
2297 /* Not supported yet */
2302 rv = kstrtoll(buf+1, 10, &offset);
2304 rv = kstrtoll(buf, 10, &offset);
2311 if (mddev->bitmap_info.external == 0 &&
2312 mddev->major_version == 0 &&
2313 offset != mddev->bitmap_info.default_offset) {
2317 mddev->bitmap_info.offset = offset;
2319 struct bitmap *bitmap;
2320 mddev->pers->quiesce(mddev, 1);
2321 bitmap = bitmap_create(mddev, -1);
2323 rv = PTR_ERR(bitmap);
2325 mddev->bitmap = bitmap;
2326 rv = bitmap_load(mddev);
2328 mddev->bitmap_info.offset = 0;
2330 mddev->pers->quiesce(mddev, 0);
2332 bitmap_destroy(mddev);
2338 if (!mddev->external) {
2339 /* Ensure new bitmap info is stored in
2340 * metadata promptly.
2342 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2343 md_wakeup_thread(mddev->thread);
2347 mddev_unlock(mddev);
2353 static struct md_sysfs_entry bitmap_location =
2354 __ATTR(location, S_IRUGO|S_IWUSR, location_show, location_store);
2356 /* 'bitmap/space' is the space available at 'location' for the
2357 * bitmap. This allows the kernel to know when it is safe to
2358 * resize the bitmap to match a resized array.
2361 space_show(struct mddev *mddev, char *page)
2363 return sprintf(page, "%lu\n", mddev->bitmap_info.space);
2367 space_store(struct mddev *mddev, const char *buf, size_t len)
2369 unsigned long sectors;
2372 rv = kstrtoul(buf, 10, §ors);
2379 if (mddev->bitmap &&
2380 sectors < (mddev->bitmap->storage.bytes + 511) >> 9)
2381 return -EFBIG; /* Bitmap is too big for this small space */
2383 /* could make sure it isn't too big, but that isn't really
2384 * needed - user-space should be careful.
2386 mddev->bitmap_info.space = sectors;
2390 static struct md_sysfs_entry bitmap_space =
2391 __ATTR(space, S_IRUGO|S_IWUSR, space_show, space_store);
2394 timeout_show(struct mddev *mddev, char *page)
2397 unsigned long secs = mddev->bitmap_info.daemon_sleep / HZ;
2398 unsigned long jifs = mddev->bitmap_info.daemon_sleep % HZ;
2400 len = sprintf(page, "%lu", secs);
2402 len += sprintf(page+len, ".%03u", jiffies_to_msecs(jifs));
2403 len += sprintf(page+len, "\n");
2408 timeout_store(struct mddev *mddev, const char *buf, size_t len)
2410 /* timeout can be set at any time */
2411 unsigned long timeout;
2412 int rv = strict_strtoul_scaled(buf, &timeout, 4);
2416 /* just to make sure we don't overflow... */
2417 if (timeout >= LONG_MAX / HZ)
2420 timeout = timeout * HZ / 10000;
2422 if (timeout >= MAX_SCHEDULE_TIMEOUT)
2423 timeout = MAX_SCHEDULE_TIMEOUT-1;
2426 mddev->bitmap_info.daemon_sleep = timeout;
2427 if (mddev->thread) {
2428 /* if thread->timeout is MAX_SCHEDULE_TIMEOUT, then
2429 * the bitmap is all clean and we don't need to
2430 * adjust the timeout right now
2432 if (mddev->thread->timeout < MAX_SCHEDULE_TIMEOUT) {
2433 mddev->thread->timeout = timeout;
2434 md_wakeup_thread(mddev->thread);
2440 static struct md_sysfs_entry bitmap_timeout =
2441 __ATTR(time_base, S_IRUGO|S_IWUSR, timeout_show, timeout_store);
2444 backlog_show(struct mddev *mddev, char *page)
2446 return sprintf(page, "%lu\n", mddev->bitmap_info.max_write_behind);
2450 backlog_store(struct mddev *mddev, const char *buf, size_t len)
2452 unsigned long backlog;
2453 int rv = kstrtoul(buf, 10, &backlog);
2456 if (backlog > COUNTER_MAX)
2458 mddev->bitmap_info.max_write_behind = backlog;
2462 static struct md_sysfs_entry bitmap_backlog =
2463 __ATTR(backlog, S_IRUGO|S_IWUSR, backlog_show, backlog_store);
2466 chunksize_show(struct mddev *mddev, char *page)
2468 return sprintf(page, "%lu\n", mddev->bitmap_info.chunksize);
2472 chunksize_store(struct mddev *mddev, const char *buf, size_t len)
2474 /* Can only be changed when no bitmap is active */
2476 unsigned long csize;
2479 rv = kstrtoul(buf, 10, &csize);
2483 !is_power_of_2(csize))
2485 mddev->bitmap_info.chunksize = csize;
2489 static struct md_sysfs_entry bitmap_chunksize =
2490 __ATTR(chunksize, S_IRUGO|S_IWUSR, chunksize_show, chunksize_store);
2492 static ssize_t metadata_show(struct mddev *mddev, char *page)
2494 if (mddev_is_clustered(mddev))
2495 return sprintf(page, "clustered\n");
2496 return sprintf(page, "%s\n", (mddev->bitmap_info.external
2497 ? "external" : "internal"));
2500 static ssize_t metadata_store(struct mddev *mddev, const char *buf, size_t len)
2502 if (mddev->bitmap ||
2503 mddev->bitmap_info.file ||
2504 mddev->bitmap_info.offset)
2506 if (strncmp(buf, "external", 8) == 0)
2507 mddev->bitmap_info.external = 1;
2508 else if ((strncmp(buf, "internal", 8) == 0) ||
2509 (strncmp(buf, "clustered", 9) == 0))
2510 mddev->bitmap_info.external = 0;
2516 static struct md_sysfs_entry bitmap_metadata =
2517 __ATTR(metadata, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
2519 static ssize_t can_clear_show(struct mddev *mddev, char *page)
2522 spin_lock(&mddev->lock);
2524 len = sprintf(page, "%s\n", (mddev->bitmap->need_sync ?
2527 len = sprintf(page, "\n");
2528 spin_unlock(&mddev->lock);
2532 static ssize_t can_clear_store(struct mddev *mddev, const char *buf, size_t len)
2534 if (mddev->bitmap == NULL)
2536 if (strncmp(buf, "false", 5) == 0)
2537 mddev->bitmap->need_sync = 1;
2538 else if (strncmp(buf, "true", 4) == 0) {
2539 if (mddev->degraded)
2541 mddev->bitmap->need_sync = 0;
2547 static struct md_sysfs_entry bitmap_can_clear =
2548 __ATTR(can_clear, S_IRUGO|S_IWUSR, can_clear_show, can_clear_store);
2551 behind_writes_used_show(struct mddev *mddev, char *page)
2554 spin_lock(&mddev->lock);
2555 if (mddev->bitmap == NULL)
2556 ret = sprintf(page, "0\n");
2558 ret = sprintf(page, "%lu\n",
2559 mddev->bitmap->behind_writes_used);
2560 spin_unlock(&mddev->lock);
2565 behind_writes_used_reset(struct mddev *mddev, const char *buf, size_t len)
2568 mddev->bitmap->behind_writes_used = 0;
2572 static struct md_sysfs_entry max_backlog_used =
2573 __ATTR(max_backlog_used, S_IRUGO | S_IWUSR,
2574 behind_writes_used_show, behind_writes_used_reset);
2576 static struct attribute *md_bitmap_attrs[] = {
2577 &bitmap_location.attr,
2579 &bitmap_timeout.attr,
2580 &bitmap_backlog.attr,
2581 &bitmap_chunksize.attr,
2582 &bitmap_metadata.attr,
2583 &bitmap_can_clear.attr,
2584 &max_backlog_used.attr,
2587 struct attribute_group md_bitmap_group = {
2589 .attrs = md_bitmap_attrs,