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>
32 #include "md-bitmap.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 md_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 md_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 md_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 md_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, false);
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 * md_bitmap_wait_writes() should be called before writing any bitmap
425 * blocks, to ensure previous writes, particularly from
426 * md_bitmap_daemon_work(), have completed.
428 static void md_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 md_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);
463 * clear BITMAP_WRITE_ERROR bit to protect against the case that
464 * a bitmap write error occurred but the later writes succeeded.
466 sb->state = cpu_to_le32(bitmap->flags & ~BIT(BITMAP_WRITE_ERROR));
467 /* Just in case these have been changed via sysfs: */
468 sb->daemon_sleep = cpu_to_le32(bitmap->mddev->bitmap_info.daemon_sleep/HZ);
469 sb->write_behind = cpu_to_le32(bitmap->mddev->bitmap_info.max_write_behind);
470 /* This might have been changed by a reshape */
471 sb->sync_size = cpu_to_le64(bitmap->mddev->resync_max_sectors);
472 sb->chunksize = cpu_to_le32(bitmap->mddev->bitmap_info.chunksize);
473 sb->nodes = cpu_to_le32(bitmap->mddev->bitmap_info.nodes);
474 sb->sectors_reserved = cpu_to_le32(bitmap->mddev->
477 write_page(bitmap, bitmap->storage.sb_page, 1);
479 EXPORT_SYMBOL(md_bitmap_update_sb);
481 /* print out the bitmap file superblock */
482 void md_bitmap_print_sb(struct bitmap *bitmap)
486 if (!bitmap || !bitmap->storage.sb_page)
488 sb = kmap_atomic(bitmap->storage.sb_page);
489 pr_debug("%s: bitmap file superblock:\n", bmname(bitmap));
490 pr_debug(" magic: %08x\n", le32_to_cpu(sb->magic));
491 pr_debug(" version: %d\n", le32_to_cpu(sb->version));
492 pr_debug(" uuid: %08x.%08x.%08x.%08x\n",
493 le32_to_cpu(*(__u32 *)(sb->uuid+0)),
494 le32_to_cpu(*(__u32 *)(sb->uuid+4)),
495 le32_to_cpu(*(__u32 *)(sb->uuid+8)),
496 le32_to_cpu(*(__u32 *)(sb->uuid+12)));
497 pr_debug(" events: %llu\n",
498 (unsigned long long) le64_to_cpu(sb->events));
499 pr_debug("events cleared: %llu\n",
500 (unsigned long long) le64_to_cpu(sb->events_cleared));
501 pr_debug(" state: %08x\n", le32_to_cpu(sb->state));
502 pr_debug(" chunksize: %d B\n", le32_to_cpu(sb->chunksize));
503 pr_debug(" daemon sleep: %ds\n", le32_to_cpu(sb->daemon_sleep));
504 pr_debug(" sync size: %llu KB\n",
505 (unsigned long long)le64_to_cpu(sb->sync_size)/2);
506 pr_debug("max write behind: %d\n", le32_to_cpu(sb->write_behind));
514 * This function is somewhat the reverse of bitmap_read_sb. bitmap_read_sb
515 * reads and verifies the on-disk bitmap superblock and populates bitmap_info.
516 * This function verifies 'bitmap_info' and populates the on-disk bitmap
517 * structure, which is to be written to disk.
519 * Returns: 0 on success, -Exxx on error
521 static int md_bitmap_new_disk_sb(struct bitmap *bitmap)
524 unsigned long chunksize, daemon_sleep, write_behind;
526 bitmap->storage.sb_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
527 if (bitmap->storage.sb_page == NULL)
529 bitmap->storage.sb_page->index = 0;
531 sb = kmap_atomic(bitmap->storage.sb_page);
533 sb->magic = cpu_to_le32(BITMAP_MAGIC);
534 sb->version = cpu_to_le32(BITMAP_MAJOR_HI);
536 chunksize = bitmap->mddev->bitmap_info.chunksize;
538 if (!is_power_of_2(chunksize)) {
540 pr_warn("bitmap chunksize not a power of 2\n");
543 sb->chunksize = cpu_to_le32(chunksize);
545 daemon_sleep = bitmap->mddev->bitmap_info.daemon_sleep;
546 if (!daemon_sleep || (daemon_sleep > MAX_SCHEDULE_TIMEOUT)) {
547 pr_debug("Choosing daemon_sleep default (5 sec)\n");
548 daemon_sleep = 5 * HZ;
550 sb->daemon_sleep = cpu_to_le32(daemon_sleep);
551 bitmap->mddev->bitmap_info.daemon_sleep = daemon_sleep;
554 * FIXME: write_behind for RAID1. If not specified, what
555 * is a good choice? We choose COUNTER_MAX / 2 arbitrarily.
557 write_behind = bitmap->mddev->bitmap_info.max_write_behind;
558 if (write_behind > COUNTER_MAX)
559 write_behind = COUNTER_MAX / 2;
560 sb->write_behind = cpu_to_le32(write_behind);
561 bitmap->mddev->bitmap_info.max_write_behind = write_behind;
563 /* keep the array size field of the bitmap superblock up to date */
564 sb->sync_size = cpu_to_le64(bitmap->mddev->resync_max_sectors);
566 memcpy(sb->uuid, bitmap->mddev->uuid, 16);
568 set_bit(BITMAP_STALE, &bitmap->flags);
569 sb->state = cpu_to_le32(bitmap->flags);
570 bitmap->events_cleared = bitmap->mddev->events;
571 sb->events_cleared = cpu_to_le64(bitmap->mddev->events);
572 bitmap->mddev->bitmap_info.nodes = 0;
579 /* read the superblock from the bitmap file and initialize some bitmap fields */
580 static int md_bitmap_read_sb(struct bitmap *bitmap)
584 unsigned long chunksize, daemon_sleep, write_behind;
585 unsigned long long events;
587 unsigned long sectors_reserved = 0;
589 struct page *sb_page;
590 loff_t offset = bitmap->mddev->bitmap_info.offset;
592 if (!bitmap->storage.file && !bitmap->mddev->bitmap_info.offset) {
593 chunksize = 128 * 1024 * 1024;
594 daemon_sleep = 5 * HZ;
596 set_bit(BITMAP_STALE, &bitmap->flags);
600 /* page 0 is the superblock, read it... */
601 sb_page = alloc_page(GFP_KERNEL);
604 bitmap->storage.sb_page = sb_page;
607 /* If cluster_slot is set, the cluster is setup */
608 if (bitmap->cluster_slot >= 0) {
609 sector_t bm_blocks = bitmap->mddev->resync_max_sectors;
611 sector_div(bm_blocks,
612 bitmap->mddev->bitmap_info.chunksize >> 9);
614 bm_blocks = ((bm_blocks+7) >> 3) + sizeof(bitmap_super_t);
616 bm_blocks = DIV_ROUND_UP_SECTOR_T(bm_blocks, 4096);
617 offset = bitmap->mddev->bitmap_info.offset + (bitmap->cluster_slot * (bm_blocks << 3));
618 pr_debug("%s:%d bm slot: %d offset: %llu\n", __func__, __LINE__,
619 bitmap->cluster_slot, offset);
622 if (bitmap->storage.file) {
623 loff_t isize = i_size_read(bitmap->storage.file->f_mapping->host);
624 int bytes = isize > PAGE_SIZE ? PAGE_SIZE : isize;
626 err = read_page(bitmap->storage.file, 0,
627 bitmap, bytes, sb_page);
629 err = read_sb_page(bitmap->mddev,
632 0, sizeof(bitmap_super_t));
638 sb = kmap_atomic(sb_page);
640 chunksize = le32_to_cpu(sb->chunksize);
641 daemon_sleep = le32_to_cpu(sb->daemon_sleep) * HZ;
642 write_behind = le32_to_cpu(sb->write_behind);
643 sectors_reserved = le32_to_cpu(sb->sectors_reserved);
645 /* verify that the bitmap-specific fields are valid */
646 if (sb->magic != cpu_to_le32(BITMAP_MAGIC))
647 reason = "bad magic";
648 else if (le32_to_cpu(sb->version) < BITMAP_MAJOR_LO ||
649 le32_to_cpu(sb->version) > BITMAP_MAJOR_CLUSTERED)
650 reason = "unrecognized superblock version";
651 else if (chunksize < 512)
652 reason = "bitmap chunksize too small";
653 else if (!is_power_of_2(chunksize))
654 reason = "bitmap chunksize not a power of 2";
655 else if (daemon_sleep < 1 || daemon_sleep > MAX_SCHEDULE_TIMEOUT)
656 reason = "daemon sleep period out of range";
657 else if (write_behind > COUNTER_MAX)
658 reason = "write-behind limit out of range (0 - 16383)";
660 pr_warn("%s: invalid bitmap file superblock: %s\n",
661 bmname(bitmap), reason);
666 * Setup nodes/clustername only if bitmap version is
669 if (sb->version == cpu_to_le32(BITMAP_MAJOR_CLUSTERED)) {
670 nodes = le32_to_cpu(sb->nodes);
671 strlcpy(bitmap->mddev->bitmap_info.cluster_name,
672 sb->cluster_name, 64);
675 /* keep the array size field of the bitmap superblock up to date */
676 sb->sync_size = cpu_to_le64(bitmap->mddev->resync_max_sectors);
678 if (bitmap->mddev->persistent) {
680 * We have a persistent array superblock, so compare the
681 * bitmap's UUID and event counter to the mddev's
683 if (memcmp(sb->uuid, bitmap->mddev->uuid, 16)) {
684 pr_warn("%s: bitmap superblock UUID mismatch\n",
688 events = le64_to_cpu(sb->events);
689 if (!nodes && (events < bitmap->mddev->events)) {
690 pr_warn("%s: bitmap file is out of date (%llu < %llu) -- forcing full recovery\n",
691 bmname(bitmap), events,
692 (unsigned long long) bitmap->mddev->events);
693 set_bit(BITMAP_STALE, &bitmap->flags);
697 /* assign fields using values from superblock */
698 bitmap->flags |= le32_to_cpu(sb->state);
699 if (le32_to_cpu(sb->version) == BITMAP_MAJOR_HOSTENDIAN)
700 set_bit(BITMAP_HOSTENDIAN, &bitmap->flags);
701 bitmap->events_cleared = le64_to_cpu(sb->events_cleared);
702 strlcpy(bitmap->mddev->bitmap_info.cluster_name, sb->cluster_name, 64);
707 if (err == 0 && nodes && (bitmap->cluster_slot < 0)) {
708 /* Assigning chunksize is required for "re_read" */
709 bitmap->mddev->bitmap_info.chunksize = chunksize;
710 err = md_setup_cluster(bitmap->mddev, nodes);
712 pr_warn("%s: Could not setup cluster service (%d)\n",
713 bmname(bitmap), err);
716 bitmap->cluster_slot = md_cluster_ops->slot_number(bitmap->mddev);
722 if (test_bit(BITMAP_STALE, &bitmap->flags))
723 bitmap->events_cleared = bitmap->mddev->events;
724 bitmap->mddev->bitmap_info.chunksize = chunksize;
725 bitmap->mddev->bitmap_info.daemon_sleep = daemon_sleep;
726 bitmap->mddev->bitmap_info.max_write_behind = write_behind;
727 bitmap->mddev->bitmap_info.nodes = nodes;
728 if (bitmap->mddev->bitmap_info.space == 0 ||
729 bitmap->mddev->bitmap_info.space > sectors_reserved)
730 bitmap->mddev->bitmap_info.space = sectors_reserved;
732 md_bitmap_print_sb(bitmap);
733 if (bitmap->cluster_slot < 0)
734 md_cluster_stop(bitmap->mddev);
740 * general bitmap file operations
746 * Use one bit per "chunk" (block set). We do the disk I/O on the bitmap
747 * file a page at a time. There's a superblock at the start of the file.
749 /* calculate the index of the page that contains this bit */
750 static inline unsigned long file_page_index(struct bitmap_storage *store,
754 chunk += sizeof(bitmap_super_t) << 3;
755 return chunk >> PAGE_BIT_SHIFT;
758 /* calculate the (bit) offset of this bit within a page */
759 static inline unsigned long file_page_offset(struct bitmap_storage *store,
763 chunk += sizeof(bitmap_super_t) << 3;
764 return chunk & (PAGE_BITS - 1);
768 * return a pointer to the page in the filemap that contains the given bit
771 static inline struct page *filemap_get_page(struct bitmap_storage *store,
774 if (file_page_index(store, chunk) >= store->file_pages)
776 return store->filemap[file_page_index(store, chunk)];
779 static int md_bitmap_storage_alloc(struct bitmap_storage *store,
780 unsigned long chunks, int with_super,
783 int pnum, offset = 0;
784 unsigned long num_pages;
787 bytes = DIV_ROUND_UP(chunks, 8);
789 bytes += sizeof(bitmap_super_t);
791 num_pages = DIV_ROUND_UP(bytes, PAGE_SIZE);
792 offset = slot_number * num_pages;
794 store->filemap = kmalloc_array(num_pages, sizeof(struct page *),
799 if (with_super && !store->sb_page) {
800 store->sb_page = alloc_page(GFP_KERNEL|__GFP_ZERO);
801 if (store->sb_page == NULL)
806 if (store->sb_page) {
807 store->filemap[0] = store->sb_page;
809 store->sb_page->index = offset;
812 for ( ; pnum < num_pages; pnum++) {
813 store->filemap[pnum] = alloc_page(GFP_KERNEL|__GFP_ZERO);
814 if (!store->filemap[pnum]) {
815 store->file_pages = pnum;
818 store->filemap[pnum]->index = pnum + offset;
820 store->file_pages = pnum;
822 /* We need 4 bits per page, rounded up to a multiple
823 * of sizeof(unsigned long) */
824 store->filemap_attr = kzalloc(
825 roundup(DIV_ROUND_UP(num_pages*4, 8), sizeof(unsigned long)),
827 if (!store->filemap_attr)
830 store->bytes = bytes;
835 static void md_bitmap_file_unmap(struct bitmap_storage *store)
837 struct page **map, *sb_page;
842 map = store->filemap;
843 pages = store->file_pages;
844 sb_page = store->sb_page;
847 if (map[pages] != sb_page) /* 0 is sb_page, release it below */
848 free_buffers(map[pages]);
850 kfree(store->filemap_attr);
853 free_buffers(sb_page);
856 struct inode *inode = file_inode(file);
857 invalidate_mapping_pages(inode->i_mapping, 0, -1);
863 * bitmap_file_kick - if an error occurs while manipulating the bitmap file
864 * then it is no longer reliable, so we stop using it and we mark the file
865 * as failed in the superblock
867 static void md_bitmap_file_kick(struct bitmap *bitmap)
869 char *path, *ptr = NULL;
871 if (!test_and_set_bit(BITMAP_STALE, &bitmap->flags)) {
872 md_bitmap_update_sb(bitmap);
874 if (bitmap->storage.file) {
875 path = kmalloc(PAGE_SIZE, GFP_KERNEL);
877 ptr = file_path(bitmap->storage.file,
880 pr_warn("%s: kicking failed bitmap file %s from array!\n",
881 bmname(bitmap), IS_ERR(ptr) ? "" : ptr);
885 pr_warn("%s: disabling internal bitmap due to errors\n",
890 enum bitmap_page_attr {
891 BITMAP_PAGE_DIRTY = 0, /* there are set bits that need to be synced */
892 BITMAP_PAGE_PENDING = 1, /* there are bits that are being cleaned.
893 * i.e. counter is 1 or 2. */
894 BITMAP_PAGE_NEEDWRITE = 2, /* there are cleared bits that need to be synced */
897 static inline void set_page_attr(struct bitmap *bitmap, int pnum,
898 enum bitmap_page_attr attr)
900 set_bit((pnum<<2) + attr, bitmap->storage.filemap_attr);
903 static inline void clear_page_attr(struct bitmap *bitmap, int pnum,
904 enum bitmap_page_attr attr)
906 clear_bit((pnum<<2) + attr, bitmap->storage.filemap_attr);
909 static inline int test_page_attr(struct bitmap *bitmap, int pnum,
910 enum bitmap_page_attr attr)
912 return test_bit((pnum<<2) + attr, bitmap->storage.filemap_attr);
915 static inline int test_and_clear_page_attr(struct bitmap *bitmap, int pnum,
916 enum bitmap_page_attr attr)
918 return test_and_clear_bit((pnum<<2) + attr,
919 bitmap->storage.filemap_attr);
922 * bitmap_file_set_bit -- called before performing a write to the md device
923 * to set (and eventually sync) a particular bit in the bitmap file
925 * we set the bit immediately, then we record the page number so that
926 * when an unplug occurs, we can flush the dirty pages out to disk
928 static void md_bitmap_file_set_bit(struct bitmap *bitmap, sector_t block)
933 unsigned long chunk = block >> bitmap->counts.chunkshift;
934 struct bitmap_storage *store = &bitmap->storage;
935 unsigned long node_offset = 0;
937 if (mddev_is_clustered(bitmap->mddev))
938 node_offset = bitmap->cluster_slot * store->file_pages;
940 page = filemap_get_page(&bitmap->storage, chunk);
943 bit = file_page_offset(&bitmap->storage, chunk);
946 kaddr = kmap_atomic(page);
947 if (test_bit(BITMAP_HOSTENDIAN, &bitmap->flags))
950 set_bit_le(bit, kaddr);
951 kunmap_atomic(kaddr);
952 pr_debug("set file bit %lu page %lu\n", bit, page->index);
953 /* record page number so it gets flushed to disk when unplug occurs */
954 set_page_attr(bitmap, page->index - node_offset, BITMAP_PAGE_DIRTY);
957 static void md_bitmap_file_clear_bit(struct bitmap *bitmap, sector_t block)
962 unsigned long chunk = block >> bitmap->counts.chunkshift;
963 struct bitmap_storage *store = &bitmap->storage;
964 unsigned long node_offset = 0;
966 if (mddev_is_clustered(bitmap->mddev))
967 node_offset = bitmap->cluster_slot * store->file_pages;
969 page = filemap_get_page(&bitmap->storage, chunk);
972 bit = file_page_offset(&bitmap->storage, chunk);
973 paddr = kmap_atomic(page);
974 if (test_bit(BITMAP_HOSTENDIAN, &bitmap->flags))
975 clear_bit(bit, paddr);
977 clear_bit_le(bit, paddr);
978 kunmap_atomic(paddr);
979 if (!test_page_attr(bitmap, page->index - node_offset, BITMAP_PAGE_NEEDWRITE)) {
980 set_page_attr(bitmap, page->index - node_offset, BITMAP_PAGE_PENDING);
981 bitmap->allclean = 0;
985 static int md_bitmap_file_test_bit(struct bitmap *bitmap, sector_t block)
990 unsigned long chunk = block >> bitmap->counts.chunkshift;
993 page = filemap_get_page(&bitmap->storage, chunk);
996 bit = file_page_offset(&bitmap->storage, chunk);
997 paddr = kmap_atomic(page);
998 if (test_bit(BITMAP_HOSTENDIAN, &bitmap->flags))
999 set = test_bit(bit, paddr);
1001 set = test_bit_le(bit, paddr);
1002 kunmap_atomic(paddr);
1007 /* this gets called when the md device is ready to unplug its underlying
1008 * (slave) device queues -- before we let any writes go down, we need to
1009 * sync the dirty pages of the bitmap file to disk */
1010 void md_bitmap_unplug(struct bitmap *bitmap)
1013 int dirty, need_write;
1016 if (!bitmap || !bitmap->storage.filemap ||
1017 test_bit(BITMAP_STALE, &bitmap->flags))
1020 /* look at each page to see if there are any set bits that need to be
1021 * flushed out to disk */
1022 for (i = 0; i < bitmap->storage.file_pages; i++) {
1023 if (!bitmap->storage.filemap)
1025 dirty = test_and_clear_page_attr(bitmap, i, BITMAP_PAGE_DIRTY);
1026 need_write = test_and_clear_page_attr(bitmap, i,
1027 BITMAP_PAGE_NEEDWRITE);
1028 if (dirty || need_write) {
1030 md_bitmap_wait_writes(bitmap);
1031 if (bitmap->mddev->queue)
1032 blk_add_trace_msg(bitmap->mddev->queue,
1033 "md bitmap_unplug");
1035 clear_page_attr(bitmap, i, BITMAP_PAGE_PENDING);
1036 write_page(bitmap, bitmap->storage.filemap[i], 0);
1041 md_bitmap_wait_writes(bitmap);
1043 if (test_bit(BITMAP_WRITE_ERROR, &bitmap->flags))
1044 md_bitmap_file_kick(bitmap);
1046 EXPORT_SYMBOL(md_bitmap_unplug);
1048 static void md_bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset, int needed);
1049 /* * bitmap_init_from_disk -- called at bitmap_create time to initialize
1050 * the in-memory bitmap from the on-disk bitmap -- also, sets up the
1051 * memory mapping of the bitmap file
1053 * if there's no bitmap file, or if the bitmap file had been
1054 * previously kicked from the array, we mark all the bits as
1055 * 1's in order to cause a full resync.
1057 * We ignore all bits for sectors that end earlier than 'start'.
1058 * This is used when reading an out-of-date bitmap...
1060 static int md_bitmap_init_from_disk(struct bitmap *bitmap, sector_t start)
1062 unsigned long i, chunks, index, oldindex, bit, node_offset = 0;
1063 struct page *page = NULL;
1064 unsigned long bit_cnt = 0;
1066 unsigned long offset;
1070 struct bitmap_storage *store = &bitmap->storage;
1072 chunks = bitmap->counts.chunks;
1075 if (!file && !bitmap->mddev->bitmap_info.offset) {
1076 /* No permanent bitmap - fill with '1s'. */
1077 store->filemap = NULL;
1078 store->file_pages = 0;
1079 for (i = 0; i < chunks ; i++) {
1080 /* if the disk bit is set, set the memory bit */
1081 int needed = ((sector_t)(i+1) << (bitmap->counts.chunkshift)
1083 md_bitmap_set_memory_bits(bitmap,
1084 (sector_t)i << bitmap->counts.chunkshift,
1090 outofdate = test_bit(BITMAP_STALE, &bitmap->flags);
1092 pr_warn("%s: bitmap file is out of date, doing full recovery\n", bmname(bitmap));
1094 if (file && i_size_read(file->f_mapping->host) < store->bytes) {
1095 pr_warn("%s: bitmap file too short %lu < %lu\n",
1097 (unsigned long) i_size_read(file->f_mapping->host),
1104 if (!bitmap->mddev->bitmap_info.external)
1105 offset = sizeof(bitmap_super_t);
1107 if (mddev_is_clustered(bitmap->mddev))
1108 node_offset = bitmap->cluster_slot * (DIV_ROUND_UP(store->bytes, PAGE_SIZE));
1110 for (i = 0; i < chunks; i++) {
1112 index = file_page_index(&bitmap->storage, i);
1113 bit = file_page_offset(&bitmap->storage, i);
1114 if (index != oldindex) { /* this is a new page, read it in */
1116 /* unmap the old page, we're done with it */
1117 if (index == store->file_pages-1)
1118 count = store->bytes - index * PAGE_SIZE;
1121 page = store->filemap[index];
1123 ret = read_page(file, index, bitmap,
1128 bitmap->mddev->bitmap_info.offset,
1130 index + node_offset, count);
1139 * if bitmap is out of date, dirty the
1140 * whole page and write it out
1142 paddr = kmap_atomic(page);
1143 memset(paddr + offset, 0xff,
1144 PAGE_SIZE - offset);
1145 kunmap_atomic(paddr);
1146 write_page(bitmap, page, 1);
1149 if (test_bit(BITMAP_WRITE_ERROR,
1154 paddr = kmap_atomic(page);
1155 if (test_bit(BITMAP_HOSTENDIAN, &bitmap->flags))
1156 b = test_bit(bit, paddr);
1158 b = test_bit_le(bit, paddr);
1159 kunmap_atomic(paddr);
1161 /* if the disk bit is set, set the memory bit */
1162 int needed = ((sector_t)(i+1) << bitmap->counts.chunkshift
1164 md_bitmap_set_memory_bits(bitmap,
1165 (sector_t)i << bitmap->counts.chunkshift,
1172 pr_debug("%s: bitmap initialized from disk: read %lu pages, set %lu of %lu bits\n",
1173 bmname(bitmap), store->file_pages,
1179 pr_warn("%s: bitmap initialisation failed: %d\n",
1180 bmname(bitmap), ret);
1184 void md_bitmap_write_all(struct bitmap *bitmap)
1186 /* We don't actually write all bitmap blocks here,
1187 * just flag them as needing to be written
1191 if (!bitmap || !bitmap->storage.filemap)
1193 if (bitmap->storage.file)
1194 /* Only one copy, so nothing needed */
1197 for (i = 0; i < bitmap->storage.file_pages; i++)
1198 set_page_attr(bitmap, i,
1199 BITMAP_PAGE_NEEDWRITE);
1200 bitmap->allclean = 0;
1203 static void md_bitmap_count_page(struct bitmap_counts *bitmap,
1204 sector_t offset, int inc)
1206 sector_t chunk = offset >> bitmap->chunkshift;
1207 unsigned long page = chunk >> PAGE_COUNTER_SHIFT;
1208 bitmap->bp[page].count += inc;
1209 md_bitmap_checkfree(bitmap, page);
1212 static void md_bitmap_set_pending(struct bitmap_counts *bitmap, sector_t offset)
1214 sector_t chunk = offset >> bitmap->chunkshift;
1215 unsigned long page = chunk >> PAGE_COUNTER_SHIFT;
1216 struct bitmap_page *bp = &bitmap->bp[page];
1222 static bitmap_counter_t *md_bitmap_get_counter(struct bitmap_counts *bitmap,
1223 sector_t offset, sector_t *blocks,
1227 * bitmap daemon -- periodically wakes up to clean bits and flush pages
1231 void md_bitmap_daemon_work(struct mddev *mddev)
1233 struct bitmap *bitmap;
1235 unsigned long nextpage;
1237 struct bitmap_counts *counts;
1239 /* Use a mutex to guard daemon_work against
1242 mutex_lock(&mddev->bitmap_info.mutex);
1243 bitmap = mddev->bitmap;
1244 if (bitmap == NULL) {
1245 mutex_unlock(&mddev->bitmap_info.mutex);
1248 if (time_before(jiffies, bitmap->daemon_lastrun
1249 + mddev->bitmap_info.daemon_sleep))
1252 bitmap->daemon_lastrun = jiffies;
1253 if (bitmap->allclean) {
1254 mddev->thread->timeout = MAX_SCHEDULE_TIMEOUT;
1257 bitmap->allclean = 1;
1259 if (bitmap->mddev->queue)
1260 blk_add_trace_msg(bitmap->mddev->queue,
1261 "md bitmap_daemon_work");
1263 /* Any file-page which is PENDING now needs to be written.
1264 * So set NEEDWRITE now, then after we make any last-minute changes
1267 for (j = 0; j < bitmap->storage.file_pages; j++)
1268 if (test_and_clear_page_attr(bitmap, j,
1269 BITMAP_PAGE_PENDING))
1270 set_page_attr(bitmap, j,
1271 BITMAP_PAGE_NEEDWRITE);
1273 if (bitmap->need_sync &&
1274 mddev->bitmap_info.external == 0) {
1275 /* Arrange for superblock update as well as
1278 bitmap->need_sync = 0;
1279 if (bitmap->storage.filemap) {
1280 sb = kmap_atomic(bitmap->storage.sb_page);
1281 sb->events_cleared =
1282 cpu_to_le64(bitmap->events_cleared);
1284 set_page_attr(bitmap, 0,
1285 BITMAP_PAGE_NEEDWRITE);
1288 /* Now look at the bitmap counters and if any are '2' or '1',
1289 * decrement and handle accordingly.
1291 counts = &bitmap->counts;
1292 spin_lock_irq(&counts->lock);
1294 for (j = 0; j < counts->chunks; j++) {
1295 bitmap_counter_t *bmc;
1296 sector_t block = (sector_t)j << counts->chunkshift;
1298 if (j == nextpage) {
1299 nextpage += PAGE_COUNTER_RATIO;
1300 if (!counts->bp[j >> PAGE_COUNTER_SHIFT].pending) {
1301 j |= PAGE_COUNTER_MASK;
1304 counts->bp[j >> PAGE_COUNTER_SHIFT].pending = 0;
1307 bmc = md_bitmap_get_counter(counts, block, &blocks, 0);
1309 j |= PAGE_COUNTER_MASK;
1312 if (*bmc == 1 && !bitmap->need_sync) {
1313 /* We can clear the bit */
1315 md_bitmap_count_page(counts, block, -1);
1316 md_bitmap_file_clear_bit(bitmap, block);
1317 } else if (*bmc && *bmc <= 2) {
1319 md_bitmap_set_pending(counts, block);
1320 bitmap->allclean = 0;
1323 spin_unlock_irq(&counts->lock);
1325 md_bitmap_wait_writes(bitmap);
1326 /* Now start writeout on any page in NEEDWRITE that isn't DIRTY.
1327 * DIRTY pages need to be written by bitmap_unplug so it can wait
1329 * If we find any DIRTY page we stop there and let bitmap_unplug
1330 * handle all the rest. This is important in the case where
1331 * the first blocking holds the superblock and it has been updated.
1332 * We mustn't write any other blocks before the superblock.
1335 j < bitmap->storage.file_pages
1336 && !test_bit(BITMAP_STALE, &bitmap->flags);
1338 if (test_page_attr(bitmap, j,
1340 /* bitmap_unplug will handle the rest */
1342 if (test_and_clear_page_attr(bitmap, j,
1343 BITMAP_PAGE_NEEDWRITE)) {
1344 write_page(bitmap, bitmap->storage.filemap[j], 0);
1349 if (bitmap->allclean == 0)
1350 mddev->thread->timeout =
1351 mddev->bitmap_info.daemon_sleep;
1352 mutex_unlock(&mddev->bitmap_info.mutex);
1355 static bitmap_counter_t *md_bitmap_get_counter(struct bitmap_counts *bitmap,
1356 sector_t offset, sector_t *blocks,
1358 __releases(bitmap->lock)
1359 __acquires(bitmap->lock)
1361 /* If 'create', we might release the lock and reclaim it.
1362 * The lock must have been taken with interrupts enabled.
1363 * If !create, we don't release the lock.
1365 sector_t chunk = offset >> bitmap->chunkshift;
1366 unsigned long page = chunk >> PAGE_COUNTER_SHIFT;
1367 unsigned long pageoff = (chunk & PAGE_COUNTER_MASK) << COUNTER_BYTE_SHIFT;
1371 err = md_bitmap_checkpage(bitmap, page, create, 0);
1373 if (bitmap->bp[page].hijacked ||
1374 bitmap->bp[page].map == NULL)
1375 csize = ((sector_t)1) << (bitmap->chunkshift +
1376 PAGE_COUNTER_SHIFT);
1378 csize = ((sector_t)1) << bitmap->chunkshift;
1379 *blocks = csize - (offset & (csize - 1));
1384 /* now locked ... */
1386 if (bitmap->bp[page].hijacked) { /* hijacked pointer */
1387 /* should we use the first or second counter field
1388 * of the hijacked pointer? */
1389 int hi = (pageoff > PAGE_COUNTER_MASK);
1390 return &((bitmap_counter_t *)
1391 &bitmap->bp[page].map)[hi];
1392 } else /* page is allocated */
1393 return (bitmap_counter_t *)
1394 &(bitmap->bp[page].map[pageoff]);
1397 int md_bitmap_startwrite(struct bitmap *bitmap, sector_t offset, unsigned long sectors, int behind)
1404 atomic_inc(&bitmap->behind_writes);
1405 bw = atomic_read(&bitmap->behind_writes);
1406 if (bw > bitmap->behind_writes_used)
1407 bitmap->behind_writes_used = bw;
1409 pr_debug("inc write-behind count %d/%lu\n",
1410 bw, bitmap->mddev->bitmap_info.max_write_behind);
1415 bitmap_counter_t *bmc;
1417 spin_lock_irq(&bitmap->counts.lock);
1418 bmc = md_bitmap_get_counter(&bitmap->counts, offset, &blocks, 1);
1420 spin_unlock_irq(&bitmap->counts.lock);
1424 if (unlikely(COUNTER(*bmc) == COUNTER_MAX)) {
1425 DEFINE_WAIT(__wait);
1426 /* note that it is safe to do the prepare_to_wait
1427 * after the test as long as we do it before dropping
1430 prepare_to_wait(&bitmap->overflow_wait, &__wait,
1431 TASK_UNINTERRUPTIBLE);
1432 spin_unlock_irq(&bitmap->counts.lock);
1434 finish_wait(&bitmap->overflow_wait, &__wait);
1440 md_bitmap_file_set_bit(bitmap, offset);
1441 md_bitmap_count_page(&bitmap->counts, offset, 1);
1449 spin_unlock_irq(&bitmap->counts.lock);
1452 if (sectors > blocks)
1459 EXPORT_SYMBOL(md_bitmap_startwrite);
1461 void md_bitmap_endwrite(struct bitmap *bitmap, sector_t offset,
1462 unsigned long sectors, int success, int behind)
1467 if (atomic_dec_and_test(&bitmap->behind_writes))
1468 wake_up(&bitmap->behind_wait);
1469 pr_debug("dec write-behind count %d/%lu\n",
1470 atomic_read(&bitmap->behind_writes),
1471 bitmap->mddev->bitmap_info.max_write_behind);
1476 unsigned long flags;
1477 bitmap_counter_t *bmc;
1479 spin_lock_irqsave(&bitmap->counts.lock, flags);
1480 bmc = md_bitmap_get_counter(&bitmap->counts, offset, &blocks, 0);
1482 spin_unlock_irqrestore(&bitmap->counts.lock, flags);
1486 if (success && !bitmap->mddev->degraded &&
1487 bitmap->events_cleared < bitmap->mddev->events) {
1488 bitmap->events_cleared = bitmap->mddev->events;
1489 bitmap->need_sync = 1;
1490 sysfs_notify_dirent_safe(bitmap->sysfs_can_clear);
1493 if (!success && !NEEDED(*bmc))
1494 *bmc |= NEEDED_MASK;
1496 if (COUNTER(*bmc) == COUNTER_MAX)
1497 wake_up(&bitmap->overflow_wait);
1501 md_bitmap_set_pending(&bitmap->counts, offset);
1502 bitmap->allclean = 0;
1504 spin_unlock_irqrestore(&bitmap->counts.lock, flags);
1506 if (sectors > blocks)
1512 EXPORT_SYMBOL(md_bitmap_endwrite);
1514 static int __bitmap_start_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks,
1517 bitmap_counter_t *bmc;
1519 if (bitmap == NULL) {/* FIXME or bitmap set as 'failed' */
1521 return 1; /* always resync if no bitmap */
1523 spin_lock_irq(&bitmap->counts.lock);
1524 bmc = md_bitmap_get_counter(&bitmap->counts, offset, blocks, 0);
1530 else if (NEEDED(*bmc)) {
1532 if (!degraded) { /* don't set/clear bits if degraded */
1533 *bmc |= RESYNC_MASK;
1534 *bmc &= ~NEEDED_MASK;
1538 spin_unlock_irq(&bitmap->counts.lock);
1542 int md_bitmap_start_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks,
1545 /* bitmap_start_sync must always report on multiples of whole
1546 * pages, otherwise resync (which is very PAGE_SIZE based) will
1548 * So call __bitmap_start_sync repeatedly (if needed) until
1549 * At least PAGE_SIZE>>9 blocks are covered.
1550 * Return the 'or' of the result.
1556 while (*blocks < (PAGE_SIZE>>9)) {
1557 rv |= __bitmap_start_sync(bitmap, offset,
1558 &blocks1, degraded);
1564 EXPORT_SYMBOL(md_bitmap_start_sync);
1566 void md_bitmap_end_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks, int aborted)
1568 bitmap_counter_t *bmc;
1569 unsigned long flags;
1571 if (bitmap == NULL) {
1575 spin_lock_irqsave(&bitmap->counts.lock, flags);
1576 bmc = md_bitmap_get_counter(&bitmap->counts, offset, blocks, 0);
1581 *bmc &= ~RESYNC_MASK;
1583 if (!NEEDED(*bmc) && aborted)
1584 *bmc |= NEEDED_MASK;
1587 md_bitmap_set_pending(&bitmap->counts, offset);
1588 bitmap->allclean = 0;
1593 spin_unlock_irqrestore(&bitmap->counts.lock, flags);
1595 EXPORT_SYMBOL(md_bitmap_end_sync);
1597 void md_bitmap_close_sync(struct bitmap *bitmap)
1599 /* Sync has finished, and any bitmap chunks that weren't synced
1600 * properly have been aborted. It remains to us to clear the
1601 * RESYNC bit wherever it is still on
1603 sector_t sector = 0;
1607 while (sector < bitmap->mddev->resync_max_sectors) {
1608 md_bitmap_end_sync(bitmap, sector, &blocks, 0);
1612 EXPORT_SYMBOL(md_bitmap_close_sync);
1614 void md_bitmap_cond_end_sync(struct bitmap *bitmap, sector_t sector, bool force)
1622 bitmap->last_end_sync = jiffies;
1625 if (!force && time_before(jiffies, (bitmap->last_end_sync
1626 + bitmap->mddev->bitmap_info.daemon_sleep)))
1628 wait_event(bitmap->mddev->recovery_wait,
1629 atomic_read(&bitmap->mddev->recovery_active) == 0);
1631 bitmap->mddev->curr_resync_completed = sector;
1632 set_bit(MD_SB_CHANGE_CLEAN, &bitmap->mddev->sb_flags);
1633 sector &= ~((1ULL << bitmap->counts.chunkshift) - 1);
1635 while (s < sector && s < bitmap->mddev->resync_max_sectors) {
1636 md_bitmap_end_sync(bitmap, s, &blocks, 0);
1639 bitmap->last_end_sync = jiffies;
1640 sysfs_notify(&bitmap->mddev->kobj, NULL, "sync_completed");
1642 EXPORT_SYMBOL(md_bitmap_cond_end_sync);
1644 void md_bitmap_sync_with_cluster(struct mddev *mddev,
1645 sector_t old_lo, sector_t old_hi,
1646 sector_t new_lo, sector_t new_hi)
1648 struct bitmap *bitmap = mddev->bitmap;
1649 sector_t sector, blocks = 0;
1651 for (sector = old_lo; sector < new_lo; ) {
1652 md_bitmap_end_sync(bitmap, sector, &blocks, 0);
1655 WARN((blocks > new_lo) && old_lo, "alignment is not correct for lo\n");
1657 for (sector = old_hi; sector < new_hi; ) {
1658 md_bitmap_start_sync(bitmap, sector, &blocks, 0);
1661 WARN((blocks > new_hi) && old_hi, "alignment is not correct for hi\n");
1663 EXPORT_SYMBOL(md_bitmap_sync_with_cluster);
1665 static void md_bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset, int needed)
1667 /* For each chunk covered by any of these sectors, set the
1668 * counter to 2 and possibly set resync_needed. They should all
1669 * be 0 at this point
1673 bitmap_counter_t *bmc;
1674 spin_lock_irq(&bitmap->counts.lock);
1675 bmc = md_bitmap_get_counter(&bitmap->counts, offset, &secs, 1);
1677 spin_unlock_irq(&bitmap->counts.lock);
1682 md_bitmap_count_page(&bitmap->counts, offset, 1);
1683 md_bitmap_set_pending(&bitmap->counts, offset);
1684 bitmap->allclean = 0;
1687 *bmc |= NEEDED_MASK;
1688 spin_unlock_irq(&bitmap->counts.lock);
1691 /* dirty the memory and file bits for bitmap chunks "s" to "e" */
1692 void md_bitmap_dirty_bits(struct bitmap *bitmap, unsigned long s, unsigned long e)
1694 unsigned long chunk;
1696 for (chunk = s; chunk <= e; chunk++) {
1697 sector_t sec = (sector_t)chunk << bitmap->counts.chunkshift;
1698 md_bitmap_set_memory_bits(bitmap, sec, 1);
1699 md_bitmap_file_set_bit(bitmap, sec);
1700 if (sec < bitmap->mddev->recovery_cp)
1701 /* We are asserting that the array is dirty,
1702 * so move the recovery_cp address back so
1703 * that it is obvious that it is dirty
1705 bitmap->mddev->recovery_cp = sec;
1710 * flush out any pending updates
1712 void md_bitmap_flush(struct mddev *mddev)
1714 struct bitmap *bitmap = mddev->bitmap;
1717 if (!bitmap) /* there was no bitmap */
1720 /* run the daemon_work three time to ensure everything is flushed
1723 sleep = mddev->bitmap_info.daemon_sleep * 2;
1724 bitmap->daemon_lastrun -= sleep;
1725 md_bitmap_daemon_work(mddev);
1726 bitmap->daemon_lastrun -= sleep;
1727 md_bitmap_daemon_work(mddev);
1728 bitmap->daemon_lastrun -= sleep;
1729 md_bitmap_daemon_work(mddev);
1730 if (mddev->bitmap_info.external)
1731 md_super_wait(mddev);
1732 md_bitmap_update_sb(bitmap);
1736 * free memory that was allocated
1738 void md_bitmap_free(struct bitmap *bitmap)
1740 unsigned long k, pages;
1741 struct bitmap_page *bp;
1743 if (!bitmap) /* there was no bitmap */
1746 if (bitmap->sysfs_can_clear)
1747 sysfs_put(bitmap->sysfs_can_clear);
1749 if (mddev_is_clustered(bitmap->mddev) && bitmap->mddev->cluster_info &&
1750 bitmap->cluster_slot == md_cluster_ops->slot_number(bitmap->mddev))
1751 md_cluster_stop(bitmap->mddev);
1753 /* Shouldn't be needed - but just in case.... */
1754 wait_event(bitmap->write_wait,
1755 atomic_read(&bitmap->pending_writes) == 0);
1757 /* release the bitmap file */
1758 md_bitmap_file_unmap(&bitmap->storage);
1760 bp = bitmap->counts.bp;
1761 pages = bitmap->counts.pages;
1763 /* free all allocated memory */
1765 if (bp) /* deallocate the page memory */
1766 for (k = 0; k < pages; k++)
1767 if (bp[k].map && !bp[k].hijacked)
1772 EXPORT_SYMBOL(md_bitmap_free);
1774 void md_bitmap_wait_behind_writes(struct mddev *mddev)
1776 struct bitmap *bitmap = mddev->bitmap;
1778 /* wait for behind writes to complete */
1779 if (bitmap && atomic_read(&bitmap->behind_writes) > 0) {
1780 pr_debug("md:%s: behind writes in progress - waiting to stop.\n",
1782 /* need to kick something here to make sure I/O goes? */
1783 wait_event(bitmap->behind_wait,
1784 atomic_read(&bitmap->behind_writes) == 0);
1788 void md_bitmap_destroy(struct mddev *mddev)
1790 struct bitmap *bitmap = mddev->bitmap;
1792 if (!bitmap) /* there was no bitmap */
1795 md_bitmap_wait_behind_writes(mddev);
1797 mutex_lock(&mddev->bitmap_info.mutex);
1798 spin_lock(&mddev->lock);
1799 mddev->bitmap = NULL; /* disconnect from the md device */
1800 spin_unlock(&mddev->lock);
1801 mutex_unlock(&mddev->bitmap_info.mutex);
1803 mddev->thread->timeout = MAX_SCHEDULE_TIMEOUT;
1805 md_bitmap_free(bitmap);
1809 * initialize the bitmap structure
1810 * if this returns an error, bitmap_destroy must be called to do clean up
1811 * once mddev->bitmap is set
1813 struct bitmap *md_bitmap_create(struct mddev *mddev, int slot)
1815 struct bitmap *bitmap;
1816 sector_t blocks = mddev->resync_max_sectors;
1817 struct file *file = mddev->bitmap_info.file;
1819 struct kernfs_node *bm = NULL;
1821 BUILD_BUG_ON(sizeof(bitmap_super_t) != 256);
1823 BUG_ON(file && mddev->bitmap_info.offset);
1825 if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) {
1826 pr_notice("md/raid:%s: array with journal cannot have bitmap\n",
1828 return ERR_PTR(-EBUSY);
1831 bitmap = kzalloc(sizeof(*bitmap), GFP_KERNEL);
1833 return ERR_PTR(-ENOMEM);
1835 spin_lock_init(&bitmap->counts.lock);
1836 atomic_set(&bitmap->pending_writes, 0);
1837 init_waitqueue_head(&bitmap->write_wait);
1838 init_waitqueue_head(&bitmap->overflow_wait);
1839 init_waitqueue_head(&bitmap->behind_wait);
1841 bitmap->mddev = mddev;
1842 bitmap->cluster_slot = slot;
1845 bm = sysfs_get_dirent(mddev->kobj.sd, "bitmap");
1847 bitmap->sysfs_can_clear = sysfs_get_dirent(bm, "can_clear");
1850 bitmap->sysfs_can_clear = NULL;
1852 bitmap->storage.file = file;
1855 /* As future accesses to this file will use bmap,
1856 * and bypass the page cache, we must sync the file
1861 /* read superblock from bitmap file (this sets mddev->bitmap_info.chunksize) */
1862 if (!mddev->bitmap_info.external) {
1864 * If 'MD_ARRAY_FIRST_USE' is set, then device-mapper is
1865 * instructing us to create a new on-disk bitmap instance.
1867 if (test_and_clear_bit(MD_ARRAY_FIRST_USE, &mddev->flags))
1868 err = md_bitmap_new_disk_sb(bitmap);
1870 err = md_bitmap_read_sb(bitmap);
1873 if (mddev->bitmap_info.chunksize == 0 ||
1874 mddev->bitmap_info.daemon_sleep == 0)
1875 /* chunksize and time_base need to be
1882 bitmap->daemon_lastrun = jiffies;
1883 err = md_bitmap_resize(bitmap, blocks, mddev->bitmap_info.chunksize, 1);
1887 pr_debug("created bitmap (%lu pages) for device %s\n",
1888 bitmap->counts.pages, bmname(bitmap));
1890 err = test_bit(BITMAP_WRITE_ERROR, &bitmap->flags) ? -EIO : 0;
1896 md_bitmap_free(bitmap);
1897 return ERR_PTR(err);
1900 int md_bitmap_load(struct mddev *mddev)
1904 sector_t sector = 0;
1905 struct bitmap *bitmap = mddev->bitmap;
1910 if (mddev_is_clustered(mddev))
1911 md_cluster_ops->load_bitmaps(mddev, mddev->bitmap_info.nodes);
1913 /* Clear out old bitmap info first: Either there is none, or we
1914 * are resuming after someone else has possibly changed things,
1915 * so we should forget old cached info.
1916 * All chunks should be clean, but some might need_sync.
1918 while (sector < mddev->resync_max_sectors) {
1920 md_bitmap_start_sync(bitmap, sector, &blocks, 0);
1923 md_bitmap_close_sync(bitmap);
1925 if (mddev->degraded == 0
1926 || bitmap->events_cleared == mddev->events)
1927 /* no need to keep dirty bits to optimise a
1928 * re-add of a missing device */
1929 start = mddev->recovery_cp;
1931 mutex_lock(&mddev->bitmap_info.mutex);
1932 err = md_bitmap_init_from_disk(bitmap, start);
1933 mutex_unlock(&mddev->bitmap_info.mutex);
1937 clear_bit(BITMAP_STALE, &bitmap->flags);
1939 /* Kick recovery in case any bits were set */
1940 set_bit(MD_RECOVERY_NEEDED, &bitmap->mddev->recovery);
1942 mddev->thread->timeout = mddev->bitmap_info.daemon_sleep;
1943 md_wakeup_thread(mddev->thread);
1945 md_bitmap_update_sb(bitmap);
1947 if (test_bit(BITMAP_WRITE_ERROR, &bitmap->flags))
1952 EXPORT_SYMBOL_GPL(md_bitmap_load);
1954 struct bitmap *get_bitmap_from_slot(struct mddev *mddev, int slot)
1957 struct bitmap *bitmap;
1959 bitmap = md_bitmap_create(mddev, slot);
1960 if (IS_ERR(bitmap)) {
1961 rv = PTR_ERR(bitmap);
1965 rv = md_bitmap_init_from_disk(bitmap, 0);
1967 md_bitmap_free(bitmap);
1973 EXPORT_SYMBOL(get_bitmap_from_slot);
1975 /* Loads the bitmap associated with slot and copies the resync information
1978 int md_bitmap_copy_from_slot(struct mddev *mddev, int slot,
1979 sector_t *low, sector_t *high, bool clear_bits)
1982 sector_t block, lo = 0, hi = 0;
1983 struct bitmap_counts *counts;
1984 struct bitmap *bitmap;
1986 bitmap = get_bitmap_from_slot(mddev, slot);
1987 if (IS_ERR(bitmap)) {
1988 pr_err("%s can't get bitmap from slot %d\n", __func__, slot);
1992 counts = &bitmap->counts;
1993 for (j = 0; j < counts->chunks; j++) {
1994 block = (sector_t)j << counts->chunkshift;
1995 if (md_bitmap_file_test_bit(bitmap, block)) {
1999 md_bitmap_file_clear_bit(bitmap, block);
2000 md_bitmap_set_memory_bits(mddev->bitmap, block, 1);
2001 md_bitmap_file_set_bit(mddev->bitmap, block);
2006 md_bitmap_update_sb(bitmap);
2007 /* BITMAP_PAGE_PENDING is set, but bitmap_unplug needs
2008 * BITMAP_PAGE_DIRTY or _NEEDWRITE to write ... */
2009 for (i = 0; i < bitmap->storage.file_pages; i++)
2010 if (test_page_attr(bitmap, i, BITMAP_PAGE_PENDING))
2011 set_page_attr(bitmap, i, BITMAP_PAGE_NEEDWRITE);
2012 md_bitmap_unplug(bitmap);
2014 md_bitmap_unplug(mddev->bitmap);
2020 EXPORT_SYMBOL_GPL(md_bitmap_copy_from_slot);
2023 void md_bitmap_status(struct seq_file *seq, struct bitmap *bitmap)
2025 unsigned long chunk_kb;
2026 struct bitmap_counts *counts;
2031 counts = &bitmap->counts;
2033 chunk_kb = bitmap->mddev->bitmap_info.chunksize >> 10;
2034 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
2036 counts->pages - counts->missing_pages,
2038 (counts->pages - counts->missing_pages)
2039 << (PAGE_SHIFT - 10),
2040 chunk_kb ? chunk_kb : bitmap->mddev->bitmap_info.chunksize,
2041 chunk_kb ? "KB" : "B");
2042 if (bitmap->storage.file) {
2043 seq_printf(seq, ", file: ");
2044 seq_file_path(seq, bitmap->storage.file, " \t\n");
2047 seq_printf(seq, "\n");
2050 int md_bitmap_resize(struct bitmap *bitmap, sector_t blocks,
2051 int chunksize, int init)
2053 /* If chunk_size is 0, choose an appropriate chunk size.
2054 * Then possibly allocate new storage space.
2055 * Then quiesce, copy bits, replace bitmap, and re-start
2057 * This function is called both to set up the initial bitmap
2058 * and to resize the bitmap while the array is active.
2059 * If this happens as a result of the array being resized,
2060 * chunksize will be zero, and we need to choose a suitable
2061 * chunksize, otherwise we use what we are given.
2063 struct bitmap_storage store;
2064 struct bitmap_counts old_counts;
2065 unsigned long chunks;
2067 sector_t old_blocks, new_blocks;
2071 struct bitmap_page *new_bp;
2073 if (bitmap->storage.file && !init) {
2074 pr_info("md: cannot resize file-based bitmap\n");
2078 if (chunksize == 0) {
2079 /* If there is enough space, leave the chunk size unchanged,
2080 * else increase by factor of two until there is enough space.
2083 long space = bitmap->mddev->bitmap_info.space;
2086 /* We don't know how much space there is, so limit
2087 * to current size - in sectors.
2089 bytes = DIV_ROUND_UP(bitmap->counts.chunks, 8);
2090 if (!bitmap->mddev->bitmap_info.external)
2091 bytes += sizeof(bitmap_super_t);
2092 space = DIV_ROUND_UP(bytes, 512);
2093 bitmap->mddev->bitmap_info.space = space;
2095 chunkshift = bitmap->counts.chunkshift;
2098 /* 'chunkshift' is shift from block size to chunk size */
2100 chunks = DIV_ROUND_UP_SECTOR_T(blocks, 1 << chunkshift);
2101 bytes = DIV_ROUND_UP(chunks, 8);
2102 if (!bitmap->mddev->bitmap_info.external)
2103 bytes += sizeof(bitmap_super_t);
2104 } while (bytes > (space << 9));
2106 chunkshift = ffz(~chunksize) - BITMAP_BLOCK_SHIFT;
2108 chunks = DIV_ROUND_UP_SECTOR_T(blocks, 1 << chunkshift);
2109 memset(&store, 0, sizeof(store));
2110 if (bitmap->mddev->bitmap_info.offset || bitmap->mddev->bitmap_info.file)
2111 ret = md_bitmap_storage_alloc(&store, chunks,
2112 !bitmap->mddev->bitmap_info.external,
2113 mddev_is_clustered(bitmap->mddev)
2114 ? bitmap->cluster_slot : 0);
2116 md_bitmap_file_unmap(&store);
2120 pages = DIV_ROUND_UP(chunks, PAGE_COUNTER_RATIO);
2122 new_bp = kcalloc(pages, sizeof(*new_bp), GFP_KERNEL);
2125 md_bitmap_file_unmap(&store);
2130 bitmap->mddev->pers->quiesce(bitmap->mddev, 1);
2132 store.file = bitmap->storage.file;
2133 bitmap->storage.file = NULL;
2135 if (store.sb_page && bitmap->storage.sb_page)
2136 memcpy(page_address(store.sb_page),
2137 page_address(bitmap->storage.sb_page),
2138 sizeof(bitmap_super_t));
2139 spin_lock_irq(&bitmap->counts.lock);
2140 md_bitmap_file_unmap(&bitmap->storage);
2141 bitmap->storage = store;
2143 old_counts = bitmap->counts;
2144 bitmap->counts.bp = new_bp;
2145 bitmap->counts.pages = pages;
2146 bitmap->counts.missing_pages = pages;
2147 bitmap->counts.chunkshift = chunkshift;
2148 bitmap->counts.chunks = chunks;
2149 bitmap->mddev->bitmap_info.chunksize = 1 << (chunkshift +
2150 BITMAP_BLOCK_SHIFT);
2152 blocks = min(old_counts.chunks << old_counts.chunkshift,
2153 chunks << chunkshift);
2155 /* For cluster raid, need to pre-allocate bitmap */
2156 if (mddev_is_clustered(bitmap->mddev)) {
2158 for (page = 0; page < pages; page++) {
2159 ret = md_bitmap_checkpage(&bitmap->counts, page, 1, 1);
2163 /* deallocate the page memory */
2164 for (k = 0; k < page; k++) {
2165 kfree(new_bp[k].map);
2169 /* restore some fields from old_counts */
2170 bitmap->counts.bp = old_counts.bp;
2171 bitmap->counts.pages = old_counts.pages;
2172 bitmap->counts.missing_pages = old_counts.pages;
2173 bitmap->counts.chunkshift = old_counts.chunkshift;
2174 bitmap->counts.chunks = old_counts.chunks;
2175 bitmap->mddev->bitmap_info.chunksize = 1 << (old_counts.chunkshift +
2176 BITMAP_BLOCK_SHIFT);
2177 blocks = old_counts.chunks << old_counts.chunkshift;
2178 pr_warn("Could not pre-allocate in-memory bitmap for cluster raid\n");
2181 bitmap->counts.bp[page].count += 1;
2185 for (block = 0; block < blocks; ) {
2186 bitmap_counter_t *bmc_old, *bmc_new;
2189 bmc_old = md_bitmap_get_counter(&old_counts, block, &old_blocks, 0);
2190 set = bmc_old && NEEDED(*bmc_old);
2193 bmc_new = md_bitmap_get_counter(&bitmap->counts, block, &new_blocks, 1);
2194 if (*bmc_new == 0) {
2195 /* need to set on-disk bits too. */
2196 sector_t end = block + new_blocks;
2197 sector_t start = block >> chunkshift;
2198 start <<= chunkshift;
2199 while (start < end) {
2200 md_bitmap_file_set_bit(bitmap, block);
2201 start += 1 << chunkshift;
2204 md_bitmap_count_page(&bitmap->counts, block, 1);
2205 md_bitmap_set_pending(&bitmap->counts, block);
2207 *bmc_new |= NEEDED_MASK;
2208 if (new_blocks < old_blocks)
2209 old_blocks = new_blocks;
2211 block += old_blocks;
2214 if (bitmap->counts.bp != old_counts.bp) {
2216 for (k = 0; k < old_counts.pages; k++)
2217 if (!old_counts.bp[k].hijacked)
2218 kfree(old_counts.bp[k].map);
2219 kfree(old_counts.bp);
2224 while (block < (chunks << chunkshift)) {
2225 bitmap_counter_t *bmc;
2226 bmc = md_bitmap_get_counter(&bitmap->counts, block, &new_blocks, 1);
2228 /* new space. It needs to be resynced, so
2229 * we set NEEDED_MASK.
2232 *bmc = NEEDED_MASK | 2;
2233 md_bitmap_count_page(&bitmap->counts, block, 1);
2234 md_bitmap_set_pending(&bitmap->counts, block);
2237 block += new_blocks;
2239 for (i = 0; i < bitmap->storage.file_pages; i++)
2240 set_page_attr(bitmap, i, BITMAP_PAGE_DIRTY);
2242 spin_unlock_irq(&bitmap->counts.lock);
2245 md_bitmap_unplug(bitmap);
2246 bitmap->mddev->pers->quiesce(bitmap->mddev, 0);
2252 EXPORT_SYMBOL_GPL(md_bitmap_resize);
2255 location_show(struct mddev *mddev, char *page)
2258 if (mddev->bitmap_info.file)
2259 len = sprintf(page, "file");
2260 else if (mddev->bitmap_info.offset)
2261 len = sprintf(page, "%+lld", (long long)mddev->bitmap_info.offset);
2263 len = sprintf(page, "none");
2264 len += sprintf(page+len, "\n");
2269 location_store(struct mddev *mddev, const char *buf, size_t len)
2273 rv = mddev_lock(mddev);
2277 if (!mddev->pers->quiesce) {
2281 if (mddev->recovery || mddev->sync_thread) {
2287 if (mddev->bitmap || mddev->bitmap_info.file ||
2288 mddev->bitmap_info.offset) {
2289 /* bitmap already configured. Only option is to clear it */
2290 if (strncmp(buf, "none", 4) != 0) {
2295 mddev->pers->quiesce(mddev, 1);
2296 md_bitmap_destroy(mddev);
2297 mddev->pers->quiesce(mddev, 0);
2299 mddev->bitmap_info.offset = 0;
2300 if (mddev->bitmap_info.file) {
2301 struct file *f = mddev->bitmap_info.file;
2302 mddev->bitmap_info.file = NULL;
2306 /* No bitmap, OK to set a location */
2308 if (strncmp(buf, "none", 4) == 0)
2309 /* nothing to be done */;
2310 else if (strncmp(buf, "file:", 5) == 0) {
2311 /* Not supported yet */
2316 rv = kstrtoll(buf+1, 10, &offset);
2318 rv = kstrtoll(buf, 10, &offset);
2325 if (mddev->bitmap_info.external == 0 &&
2326 mddev->major_version == 0 &&
2327 offset != mddev->bitmap_info.default_offset) {
2331 mddev->bitmap_info.offset = offset;
2333 struct bitmap *bitmap;
2334 mddev->pers->quiesce(mddev, 1);
2335 bitmap = md_bitmap_create(mddev, -1);
2337 rv = PTR_ERR(bitmap);
2339 mddev->bitmap = bitmap;
2340 rv = md_bitmap_load(mddev);
2342 mddev->bitmap_info.offset = 0;
2344 mddev->pers->quiesce(mddev, 0);
2346 md_bitmap_destroy(mddev);
2352 if (!mddev->external) {
2353 /* Ensure new bitmap info is stored in
2354 * metadata promptly.
2356 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2357 md_wakeup_thread(mddev->thread);
2361 mddev_unlock(mddev);
2367 static struct md_sysfs_entry bitmap_location =
2368 __ATTR(location, S_IRUGO|S_IWUSR, location_show, location_store);
2370 /* 'bitmap/space' is the space available at 'location' for the
2371 * bitmap. This allows the kernel to know when it is safe to
2372 * resize the bitmap to match a resized array.
2375 space_show(struct mddev *mddev, char *page)
2377 return sprintf(page, "%lu\n", mddev->bitmap_info.space);
2381 space_store(struct mddev *mddev, const char *buf, size_t len)
2383 unsigned long sectors;
2386 rv = kstrtoul(buf, 10, §ors);
2393 if (mddev->bitmap &&
2394 sectors < (mddev->bitmap->storage.bytes + 511) >> 9)
2395 return -EFBIG; /* Bitmap is too big for this small space */
2397 /* could make sure it isn't too big, but that isn't really
2398 * needed - user-space should be careful.
2400 mddev->bitmap_info.space = sectors;
2404 static struct md_sysfs_entry bitmap_space =
2405 __ATTR(space, S_IRUGO|S_IWUSR, space_show, space_store);
2408 timeout_show(struct mddev *mddev, char *page)
2411 unsigned long secs = mddev->bitmap_info.daemon_sleep / HZ;
2412 unsigned long jifs = mddev->bitmap_info.daemon_sleep % HZ;
2414 len = sprintf(page, "%lu", secs);
2416 len += sprintf(page+len, ".%03u", jiffies_to_msecs(jifs));
2417 len += sprintf(page+len, "\n");
2422 timeout_store(struct mddev *mddev, const char *buf, size_t len)
2424 /* timeout can be set at any time */
2425 unsigned long timeout;
2426 int rv = strict_strtoul_scaled(buf, &timeout, 4);
2430 /* just to make sure we don't overflow... */
2431 if (timeout >= LONG_MAX / HZ)
2434 timeout = timeout * HZ / 10000;
2436 if (timeout >= MAX_SCHEDULE_TIMEOUT)
2437 timeout = MAX_SCHEDULE_TIMEOUT-1;
2440 mddev->bitmap_info.daemon_sleep = timeout;
2441 if (mddev->thread) {
2442 /* if thread->timeout is MAX_SCHEDULE_TIMEOUT, then
2443 * the bitmap is all clean and we don't need to
2444 * adjust the timeout right now
2446 if (mddev->thread->timeout < MAX_SCHEDULE_TIMEOUT) {
2447 mddev->thread->timeout = timeout;
2448 md_wakeup_thread(mddev->thread);
2454 static struct md_sysfs_entry bitmap_timeout =
2455 __ATTR(time_base, S_IRUGO|S_IWUSR, timeout_show, timeout_store);
2458 backlog_show(struct mddev *mddev, char *page)
2460 return sprintf(page, "%lu\n", mddev->bitmap_info.max_write_behind);
2464 backlog_store(struct mddev *mddev, const char *buf, size_t len)
2466 unsigned long backlog;
2467 int rv = kstrtoul(buf, 10, &backlog);
2470 if (backlog > COUNTER_MAX)
2472 mddev->bitmap_info.max_write_behind = backlog;
2476 static struct md_sysfs_entry bitmap_backlog =
2477 __ATTR(backlog, S_IRUGO|S_IWUSR, backlog_show, backlog_store);
2480 chunksize_show(struct mddev *mddev, char *page)
2482 return sprintf(page, "%lu\n", mddev->bitmap_info.chunksize);
2486 chunksize_store(struct mddev *mddev, const char *buf, size_t len)
2488 /* Can only be changed when no bitmap is active */
2490 unsigned long csize;
2493 rv = kstrtoul(buf, 10, &csize);
2497 !is_power_of_2(csize))
2499 mddev->bitmap_info.chunksize = csize;
2503 static struct md_sysfs_entry bitmap_chunksize =
2504 __ATTR(chunksize, S_IRUGO|S_IWUSR, chunksize_show, chunksize_store);
2506 static ssize_t metadata_show(struct mddev *mddev, char *page)
2508 if (mddev_is_clustered(mddev))
2509 return sprintf(page, "clustered\n");
2510 return sprintf(page, "%s\n", (mddev->bitmap_info.external
2511 ? "external" : "internal"));
2514 static ssize_t metadata_store(struct mddev *mddev, const char *buf, size_t len)
2516 if (mddev->bitmap ||
2517 mddev->bitmap_info.file ||
2518 mddev->bitmap_info.offset)
2520 if (strncmp(buf, "external", 8) == 0)
2521 mddev->bitmap_info.external = 1;
2522 else if ((strncmp(buf, "internal", 8) == 0) ||
2523 (strncmp(buf, "clustered", 9) == 0))
2524 mddev->bitmap_info.external = 0;
2530 static struct md_sysfs_entry bitmap_metadata =
2531 __ATTR(metadata, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
2533 static ssize_t can_clear_show(struct mddev *mddev, char *page)
2536 spin_lock(&mddev->lock);
2538 len = sprintf(page, "%s\n", (mddev->bitmap->need_sync ?
2541 len = sprintf(page, "\n");
2542 spin_unlock(&mddev->lock);
2546 static ssize_t can_clear_store(struct mddev *mddev, const char *buf, size_t len)
2548 if (mddev->bitmap == NULL)
2550 if (strncmp(buf, "false", 5) == 0)
2551 mddev->bitmap->need_sync = 1;
2552 else if (strncmp(buf, "true", 4) == 0) {
2553 if (mddev->degraded)
2555 mddev->bitmap->need_sync = 0;
2561 static struct md_sysfs_entry bitmap_can_clear =
2562 __ATTR(can_clear, S_IRUGO|S_IWUSR, can_clear_show, can_clear_store);
2565 behind_writes_used_show(struct mddev *mddev, char *page)
2568 spin_lock(&mddev->lock);
2569 if (mddev->bitmap == NULL)
2570 ret = sprintf(page, "0\n");
2572 ret = sprintf(page, "%lu\n",
2573 mddev->bitmap->behind_writes_used);
2574 spin_unlock(&mddev->lock);
2579 behind_writes_used_reset(struct mddev *mddev, const char *buf, size_t len)
2582 mddev->bitmap->behind_writes_used = 0;
2586 static struct md_sysfs_entry max_backlog_used =
2587 __ATTR(max_backlog_used, S_IRUGO | S_IWUSR,
2588 behind_writes_used_show, behind_writes_used_reset);
2590 static struct attribute *md_bitmap_attrs[] = {
2591 &bitmap_location.attr,
2593 &bitmap_timeout.attr,
2594 &bitmap_backlog.attr,
2595 &bitmap_chunksize.attr,
2596 &bitmap_metadata.attr,
2597 &bitmap_can_clear.attr,
2598 &max_backlog_used.attr,
2601 struct attribute_group md_bitmap_group = {
2603 .attrs = md_bitmap_attrs,