1 // SPDX-License-Identifier: GPL-2.0-only
3 * bitmap.c two-level bitmap (C) Peter T. Breuer (ptb@ot.uc3m.es) 2003
5 * bitmap_create - sets up the bitmap structure
6 * bitmap_destroy - destroys the bitmap structure
8 * additions, Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.:
9 * - added disk storage for bitmap
10 * - changes to allow various bitmap chunk sizes
16 * flush after percent set rather than just time based. (maybe both).
19 #include <linux/blkdev.h>
20 #include <linux/module.h>
21 #include <linux/errno.h>
22 #include <linux/slab.h>
23 #include <linux/init.h>
24 #include <linux/timer.h>
25 #include <linux/sched.h>
26 #include <linux/list.h>
27 #include <linux/file.h>
28 #include <linux/mount.h>
29 #include <linux/buffer_head.h>
30 #include <linux/seq_file.h>
31 #include <trace/events/block.h>
33 #include "md-bitmap.h"
35 static inline char *bmname(struct bitmap *bitmap)
37 return bitmap->mddev ? mdname(bitmap->mddev) : "mdX";
41 * check a page and, if necessary, allocate it (or hijack it if the alloc fails)
43 * 1) check to see if this page is allocated, if it's not then try to alloc
44 * 2) if the alloc fails, set the page's hijacked flag so we'll use the
45 * page pointer directly as a counter
47 * if we find our page, we increment the page's refcount so that it stays
48 * allocated while we're using it
50 static int md_bitmap_checkpage(struct bitmap_counts *bitmap,
51 unsigned long page, int create, int no_hijack)
52 __releases(bitmap->lock)
53 __acquires(bitmap->lock)
55 unsigned char *mappage;
57 if (page >= bitmap->pages) {
58 /* This can happen if bitmap_start_sync goes beyond
59 * End-of-device while looking for a whole page.
65 if (bitmap->bp[page].hijacked) /* it's hijacked, don't try to alloc */
68 if (bitmap->bp[page].map) /* page is already allocated, just return */
74 /* this page has not been allocated yet */
76 spin_unlock_irq(&bitmap->lock);
77 /* It is possible that this is being called inside a
78 * prepare_to_wait/finish_wait loop from raid5c:make_request().
79 * In general it is not permitted to sleep in that context as it
80 * can cause the loop to spin freely.
81 * That doesn't apply here as we can only reach this point
83 * When this function completes, either bp[page].map or
84 * bp[page].hijacked. In either case, this function will
85 * abort before getting to this point again. So there is
86 * no risk of a free-spin, and so it is safe to assert
87 * that sleeping here is allowed.
89 sched_annotate_sleep();
90 mappage = kzalloc(PAGE_SIZE, GFP_NOIO);
91 spin_lock_irq(&bitmap->lock);
93 if (mappage == NULL) {
94 pr_debug("md/bitmap: map page allocation failed, hijacking\n");
95 /* We don't support hijack for cluster raid */
98 /* failed - set the hijacked flag so that we can use the
99 * pointer as a counter */
100 if (!bitmap->bp[page].map)
101 bitmap->bp[page].hijacked = 1;
102 } else if (bitmap->bp[page].map ||
103 bitmap->bp[page].hijacked) {
104 /* somebody beat us to getting the page */
108 /* no page was in place and we have one, so install it */
110 bitmap->bp[page].map = mappage;
111 bitmap->missing_pages--;
116 /* if page is completely empty, put it back on the free list, or dealloc it */
117 /* if page was hijacked, unmark the flag so it might get alloced next time */
118 /* Note: lock should be held when calling this */
119 static void md_bitmap_checkfree(struct bitmap_counts *bitmap, unsigned long page)
123 if (bitmap->bp[page].count) /* page is still busy */
126 /* page is no longer in use, it can be released */
128 if (bitmap->bp[page].hijacked) { /* page was hijacked, undo this now */
129 bitmap->bp[page].hijacked = 0;
130 bitmap->bp[page].map = NULL;
132 /* normal case, free the page */
133 ptr = bitmap->bp[page].map;
134 bitmap->bp[page].map = NULL;
135 bitmap->missing_pages++;
141 * bitmap file handling - read and write the bitmap file and its superblock
145 * basic page I/O operations
148 /* IO operations when bitmap is stored near all superblocks */
149 static int read_sb_page(struct mddev *mddev, loff_t offset,
151 unsigned long index, int size)
153 /* choose a good rdev and read the page from there */
155 struct md_rdev *rdev;
158 rdev_for_each(rdev, mddev) {
159 if (! test_bit(In_sync, &rdev->flags)
160 || test_bit(Faulty, &rdev->flags)
161 || test_bit(Bitmap_sync, &rdev->flags))
164 target = offset + index * (PAGE_SIZE/512);
166 if (sync_page_io(rdev, target,
167 roundup(size, bdev_logical_block_size(rdev->bdev)),
168 page, REQ_OP_READ, 0, true)) {
176 static struct md_rdev *next_active_rdev(struct md_rdev *rdev, struct mddev *mddev)
178 /* Iterate the disks of an mddev, using rcu to protect access to the
179 * linked list, and raising the refcount of devices we return to ensure
180 * they don't disappear while in use.
181 * As devices are only added or removed when raid_disk is < 0 and
182 * nr_pending is 0 and In_sync is clear, the entries we return will
183 * still be in the same position on the list when we re-enter
184 * list_for_each_entry_continue_rcu.
186 * Note that if entered with 'rdev == NULL' to start at the
187 * beginning, we temporarily assign 'rdev' to an address which
188 * isn't really an rdev, but which can be used by
189 * list_for_each_entry_continue_rcu() to find the first entry.
193 /* start at the beginning */
194 rdev = list_entry(&mddev->disks, struct md_rdev, same_set);
196 /* release the previous rdev and start from there. */
197 rdev_dec_pending(rdev, mddev);
199 list_for_each_entry_continue_rcu(rdev, &mddev->disks, same_set) {
200 if (rdev->raid_disk >= 0 &&
201 !test_bit(Faulty, &rdev->flags)) {
202 /* this is a usable devices */
203 atomic_inc(&rdev->nr_pending);
212 static int write_sb_page(struct bitmap *bitmap, struct page *page, int wait)
214 struct md_rdev *rdev;
215 struct block_device *bdev;
216 struct mddev *mddev = bitmap->mddev;
217 struct bitmap_storage *store = &bitmap->storage;
221 while ((rdev = next_active_rdev(rdev, mddev)) != NULL) {
222 int size = PAGE_SIZE;
223 loff_t offset = mddev->bitmap_info.offset;
225 bdev = (rdev->meta_bdev) ? rdev->meta_bdev : rdev->bdev;
227 if (page->index == store->file_pages-1) {
228 int last_page_size = store->bytes & (PAGE_SIZE-1);
229 if (last_page_size == 0)
230 last_page_size = PAGE_SIZE;
231 size = roundup(last_page_size,
232 bdev_logical_block_size(bdev));
234 /* Just make sure we aren't corrupting data or
237 if (mddev->external) {
238 /* Bitmap could be anywhere. */
239 if (rdev->sb_start + offset + (page->index
243 rdev->sb_start + offset
244 < (rdev->data_offset + mddev->dev_sectors
247 } else if (offset < 0) {
248 /* DATA BITMAP METADATA */
250 + (long)(page->index * (PAGE_SIZE/512))
252 /* bitmap runs in to metadata */
254 if (rdev->data_offset + mddev->dev_sectors
255 > rdev->sb_start + offset)
256 /* data runs in to bitmap */
258 } else if (rdev->sb_start < rdev->data_offset) {
259 /* METADATA BITMAP DATA */
262 + page->index*(PAGE_SIZE/512) + size/512
264 /* bitmap runs in to data */
267 /* DATA METADATA BITMAP - no problems */
269 md_super_write(mddev, rdev,
270 rdev->sb_start + offset
271 + page->index * (PAGE_SIZE/512),
276 if (wait && md_super_wait(mddev) < 0)
284 static void md_bitmap_file_kick(struct bitmap *bitmap);
286 * write out a page to a file
288 static void write_page(struct bitmap *bitmap, struct page *page, int wait)
290 struct buffer_head *bh;
292 if (bitmap->storage.file == NULL) {
293 switch (write_sb_page(bitmap, page, wait)) {
295 set_bit(BITMAP_WRITE_ERROR, &bitmap->flags);
299 bh = page_buffers(page);
301 while (bh && bh->b_blocknr) {
302 atomic_inc(&bitmap->pending_writes);
303 set_buffer_locked(bh);
304 set_buffer_mapped(bh);
305 submit_bh(REQ_OP_WRITE, REQ_SYNC, bh);
306 bh = bh->b_this_page;
310 wait_event(bitmap->write_wait,
311 atomic_read(&bitmap->pending_writes)==0);
313 if (test_bit(BITMAP_WRITE_ERROR, &bitmap->flags))
314 md_bitmap_file_kick(bitmap);
317 static void end_bitmap_write(struct buffer_head *bh, int uptodate)
319 struct bitmap *bitmap = bh->b_private;
322 set_bit(BITMAP_WRITE_ERROR, &bitmap->flags);
323 if (atomic_dec_and_test(&bitmap->pending_writes))
324 wake_up(&bitmap->write_wait);
327 /* copied from buffer.c */
329 __clear_page_buffers(struct page *page)
331 ClearPagePrivate(page);
332 set_page_private(page, 0);
335 static void free_buffers(struct page *page)
337 struct buffer_head *bh;
339 if (!PagePrivate(page))
342 bh = page_buffers(page);
344 struct buffer_head *next = bh->b_this_page;
345 free_buffer_head(bh);
348 __clear_page_buffers(page);
352 /* read a page from a file.
353 * We both read the page, and attach buffers to the page to record the
354 * address of each block (using bmap). These addresses will be used
355 * to write the block later, completely bypassing the filesystem.
356 * This usage is similar to how swap files are handled, and allows us
357 * to write to a file with no concerns of memory allocation failing.
359 static int read_page(struct file *file, unsigned long index,
360 struct bitmap *bitmap,
365 struct inode *inode = file_inode(file);
366 struct buffer_head *bh;
369 pr_debug("read bitmap file (%dB @ %llu)\n", (int)PAGE_SIZE,
370 (unsigned long long)index << PAGE_SHIFT);
372 bh = alloc_page_buffers(page, 1<<inode->i_blkbits, false);
377 attach_page_buffers(page, bh);
378 block = index << (PAGE_SHIFT - inode->i_blkbits);
383 bh->b_blocknr = bmap(inode, block);
384 if (bh->b_blocknr == 0) {
385 /* Cannot use this file! */
389 bh->b_bdev = inode->i_sb->s_bdev;
390 if (count < (1<<inode->i_blkbits))
393 count -= (1<<inode->i_blkbits);
395 bh->b_end_io = end_bitmap_write;
396 bh->b_private = bitmap;
397 atomic_inc(&bitmap->pending_writes);
398 set_buffer_locked(bh);
399 set_buffer_mapped(bh);
400 submit_bh(REQ_OP_READ, 0, bh);
403 bh = bh->b_this_page;
407 wait_event(bitmap->write_wait,
408 atomic_read(&bitmap->pending_writes)==0);
409 if (test_bit(BITMAP_WRITE_ERROR, &bitmap->flags))
413 pr_err("md: bitmap read error: (%dB @ %llu): %d\n",
415 (unsigned long long)index << PAGE_SHIFT,
421 * bitmap file superblock operations
425 * md_bitmap_wait_writes() should be called before writing any bitmap
426 * blocks, to ensure previous writes, particularly from
427 * md_bitmap_daemon_work(), have completed.
429 static void md_bitmap_wait_writes(struct bitmap *bitmap)
431 if (bitmap->storage.file)
432 wait_event(bitmap->write_wait,
433 atomic_read(&bitmap->pending_writes)==0);
435 /* Note that we ignore the return value. The writes
436 * might have failed, but that would just mean that
437 * some bits which should be cleared haven't been,
438 * which is safe. The relevant bitmap blocks will
439 * probably get written again, but there is no great
440 * loss if they aren't.
442 md_super_wait(bitmap->mddev);
446 /* update the event counter and sync the superblock to disk */
447 void md_bitmap_update_sb(struct bitmap *bitmap)
451 if (!bitmap || !bitmap->mddev) /* no bitmap for this array */
453 if (bitmap->mddev->bitmap_info.external)
455 if (!bitmap->storage.sb_page) /* no superblock */
457 sb = kmap_atomic(bitmap->storage.sb_page);
458 sb->events = cpu_to_le64(bitmap->mddev->events);
459 if (bitmap->mddev->events < bitmap->events_cleared)
460 /* rocking back to read-only */
461 bitmap->events_cleared = bitmap->mddev->events;
462 sb->events_cleared = cpu_to_le64(bitmap->events_cleared);
464 * clear BITMAP_WRITE_ERROR bit to protect against the case that
465 * a bitmap write error occurred but the later writes succeeded.
467 sb->state = cpu_to_le32(bitmap->flags & ~BIT(BITMAP_WRITE_ERROR));
468 /* Just in case these have been changed via sysfs: */
469 sb->daemon_sleep = cpu_to_le32(bitmap->mddev->bitmap_info.daemon_sleep/HZ);
470 sb->write_behind = cpu_to_le32(bitmap->mddev->bitmap_info.max_write_behind);
471 /* This might have been changed by a reshape */
472 sb->sync_size = cpu_to_le64(bitmap->mddev->resync_max_sectors);
473 sb->chunksize = cpu_to_le32(bitmap->mddev->bitmap_info.chunksize);
474 sb->nodes = cpu_to_le32(bitmap->mddev->bitmap_info.nodes);
475 sb->sectors_reserved = cpu_to_le32(bitmap->mddev->
478 write_page(bitmap, bitmap->storage.sb_page, 1);
480 EXPORT_SYMBOL(md_bitmap_update_sb);
482 /* print out the bitmap file superblock */
483 void md_bitmap_print_sb(struct bitmap *bitmap)
487 if (!bitmap || !bitmap->storage.sb_page)
489 sb = kmap_atomic(bitmap->storage.sb_page);
490 pr_debug("%s: bitmap file superblock:\n", bmname(bitmap));
491 pr_debug(" magic: %08x\n", le32_to_cpu(sb->magic));
492 pr_debug(" version: %d\n", le32_to_cpu(sb->version));
493 pr_debug(" uuid: %08x.%08x.%08x.%08x\n",
494 le32_to_cpu(*(__le32 *)(sb->uuid+0)),
495 le32_to_cpu(*(__le32 *)(sb->uuid+4)),
496 le32_to_cpu(*(__le32 *)(sb->uuid+8)),
497 le32_to_cpu(*(__le32 *)(sb->uuid+12)));
498 pr_debug(" events: %llu\n",
499 (unsigned long long) le64_to_cpu(sb->events));
500 pr_debug("events cleared: %llu\n",
501 (unsigned long long) le64_to_cpu(sb->events_cleared));
502 pr_debug(" state: %08x\n", le32_to_cpu(sb->state));
503 pr_debug(" chunksize: %d B\n", le32_to_cpu(sb->chunksize));
504 pr_debug(" daemon sleep: %ds\n", le32_to_cpu(sb->daemon_sleep));
505 pr_debug(" sync size: %llu KB\n",
506 (unsigned long long)le64_to_cpu(sb->sync_size)/2);
507 pr_debug("max write behind: %d\n", le32_to_cpu(sb->write_behind));
515 * This function is somewhat the reverse of bitmap_read_sb. bitmap_read_sb
516 * reads and verifies the on-disk bitmap superblock and populates bitmap_info.
517 * This function verifies 'bitmap_info' and populates the on-disk bitmap
518 * structure, which is to be written to disk.
520 * Returns: 0 on success, -Exxx on error
522 static int md_bitmap_new_disk_sb(struct bitmap *bitmap)
525 unsigned long chunksize, daemon_sleep, write_behind;
527 bitmap->storage.sb_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
528 if (bitmap->storage.sb_page == NULL)
530 bitmap->storage.sb_page->index = 0;
532 sb = kmap_atomic(bitmap->storage.sb_page);
534 sb->magic = cpu_to_le32(BITMAP_MAGIC);
535 sb->version = cpu_to_le32(BITMAP_MAJOR_HI);
537 chunksize = bitmap->mddev->bitmap_info.chunksize;
539 if (!is_power_of_2(chunksize)) {
541 pr_warn("bitmap chunksize not a power of 2\n");
544 sb->chunksize = cpu_to_le32(chunksize);
546 daemon_sleep = bitmap->mddev->bitmap_info.daemon_sleep;
547 if (!daemon_sleep || (daemon_sleep > MAX_SCHEDULE_TIMEOUT)) {
548 pr_debug("Choosing daemon_sleep default (5 sec)\n");
549 daemon_sleep = 5 * HZ;
551 sb->daemon_sleep = cpu_to_le32(daemon_sleep);
552 bitmap->mddev->bitmap_info.daemon_sleep = daemon_sleep;
555 * FIXME: write_behind for RAID1. If not specified, what
556 * is a good choice? We choose COUNTER_MAX / 2 arbitrarily.
558 write_behind = bitmap->mddev->bitmap_info.max_write_behind;
559 if (write_behind > COUNTER_MAX)
560 write_behind = COUNTER_MAX / 2;
561 sb->write_behind = cpu_to_le32(write_behind);
562 bitmap->mddev->bitmap_info.max_write_behind = write_behind;
564 /* keep the array size field of the bitmap superblock up to date */
565 sb->sync_size = cpu_to_le64(bitmap->mddev->resync_max_sectors);
567 memcpy(sb->uuid, bitmap->mddev->uuid, 16);
569 set_bit(BITMAP_STALE, &bitmap->flags);
570 sb->state = cpu_to_le32(bitmap->flags);
571 bitmap->events_cleared = bitmap->mddev->events;
572 sb->events_cleared = cpu_to_le64(bitmap->mddev->events);
573 bitmap->mddev->bitmap_info.nodes = 0;
580 /* read the superblock from the bitmap file and initialize some bitmap fields */
581 static int md_bitmap_read_sb(struct bitmap *bitmap)
585 unsigned long chunksize, daemon_sleep, write_behind;
586 unsigned long long events;
588 unsigned long sectors_reserved = 0;
590 struct page *sb_page;
591 loff_t offset = bitmap->mddev->bitmap_info.offset;
593 if (!bitmap->storage.file && !bitmap->mddev->bitmap_info.offset) {
594 chunksize = 128 * 1024 * 1024;
595 daemon_sleep = 5 * HZ;
597 set_bit(BITMAP_STALE, &bitmap->flags);
601 /* page 0 is the superblock, read it... */
602 sb_page = alloc_page(GFP_KERNEL);
605 bitmap->storage.sb_page = sb_page;
608 /* If cluster_slot is set, the cluster is setup */
609 if (bitmap->cluster_slot >= 0) {
610 sector_t bm_blocks = bitmap->mddev->resync_max_sectors;
612 sector_div(bm_blocks,
613 bitmap->mddev->bitmap_info.chunksize >> 9);
615 bm_blocks = ((bm_blocks+7) >> 3) + sizeof(bitmap_super_t);
617 bm_blocks = DIV_ROUND_UP_SECTOR_T(bm_blocks, 4096);
618 offset = bitmap->mddev->bitmap_info.offset + (bitmap->cluster_slot * (bm_blocks << 3));
619 pr_debug("%s:%d bm slot: %d offset: %llu\n", __func__, __LINE__,
620 bitmap->cluster_slot, offset);
623 if (bitmap->storage.file) {
624 loff_t isize = i_size_read(bitmap->storage.file->f_mapping->host);
625 int bytes = isize > PAGE_SIZE ? PAGE_SIZE : isize;
627 err = read_page(bitmap->storage.file, 0,
628 bitmap, bytes, sb_page);
630 err = read_sb_page(bitmap->mddev,
633 0, sizeof(bitmap_super_t));
639 sb = kmap_atomic(sb_page);
641 chunksize = le32_to_cpu(sb->chunksize);
642 daemon_sleep = le32_to_cpu(sb->daemon_sleep) * HZ;
643 write_behind = le32_to_cpu(sb->write_behind);
644 sectors_reserved = le32_to_cpu(sb->sectors_reserved);
645 /* Setup nodes/clustername only if bitmap version is
648 if (sb->version == cpu_to_le32(BITMAP_MAJOR_CLUSTERED)) {
649 nodes = le32_to_cpu(sb->nodes);
650 strlcpy(bitmap->mddev->bitmap_info.cluster_name,
651 sb->cluster_name, 64);
654 /* verify that the bitmap-specific fields are valid */
655 if (sb->magic != cpu_to_le32(BITMAP_MAGIC))
656 reason = "bad magic";
657 else if (le32_to_cpu(sb->version) < BITMAP_MAJOR_LO ||
658 le32_to_cpu(sb->version) > BITMAP_MAJOR_CLUSTERED)
659 reason = "unrecognized superblock version";
660 else if (chunksize < 512)
661 reason = "bitmap chunksize too small";
662 else if (!is_power_of_2(chunksize))
663 reason = "bitmap chunksize not a power of 2";
664 else if (daemon_sleep < 1 || daemon_sleep > MAX_SCHEDULE_TIMEOUT)
665 reason = "daemon sleep period out of range";
666 else if (write_behind > COUNTER_MAX)
667 reason = "write-behind limit out of range (0 - 16383)";
669 pr_warn("%s: invalid bitmap file superblock: %s\n",
670 bmname(bitmap), reason);
674 /* keep the array size field of the bitmap superblock up to date */
675 sb->sync_size = cpu_to_le64(bitmap->mddev->resync_max_sectors);
677 if (bitmap->mddev->persistent) {
679 * We have a persistent array superblock, so compare the
680 * bitmap's UUID and event counter to the mddev's
682 if (memcmp(sb->uuid, bitmap->mddev->uuid, 16)) {
683 pr_warn("%s: bitmap superblock UUID mismatch\n",
687 events = le64_to_cpu(sb->events);
688 if (!nodes && (events < bitmap->mddev->events)) {
689 pr_warn("%s: bitmap file is out of date (%llu < %llu) -- forcing full recovery\n",
690 bmname(bitmap), events,
691 (unsigned long long) bitmap->mddev->events);
692 set_bit(BITMAP_STALE, &bitmap->flags);
696 /* assign fields using values from superblock */
697 bitmap->flags |= le32_to_cpu(sb->state);
698 if (le32_to_cpu(sb->version) == BITMAP_MAJOR_HOSTENDIAN)
699 set_bit(BITMAP_HOSTENDIAN, &bitmap->flags);
700 bitmap->events_cleared = le64_to_cpu(sb->events_cleared);
701 strlcpy(bitmap->mddev->bitmap_info.cluster_name, sb->cluster_name, 64);
706 /* Assigning chunksize is required for "re_read" */
707 bitmap->mddev->bitmap_info.chunksize = chunksize;
708 if (err == 0 && nodes && (bitmap->cluster_slot < 0)) {
709 err = md_setup_cluster(bitmap->mddev, nodes);
711 pr_warn("%s: Could not setup cluster service (%d)\n",
712 bmname(bitmap), err);
715 bitmap->cluster_slot = md_cluster_ops->slot_number(bitmap->mddev);
721 if (test_bit(BITMAP_STALE, &bitmap->flags))
722 bitmap->events_cleared = bitmap->mddev->events;
723 bitmap->mddev->bitmap_info.chunksize = chunksize;
724 bitmap->mddev->bitmap_info.daemon_sleep = daemon_sleep;
725 bitmap->mddev->bitmap_info.max_write_behind = write_behind;
726 bitmap->mddev->bitmap_info.nodes = nodes;
727 if (bitmap->mddev->bitmap_info.space == 0 ||
728 bitmap->mddev->bitmap_info.space > sectors_reserved)
729 bitmap->mddev->bitmap_info.space = sectors_reserved;
731 md_bitmap_print_sb(bitmap);
732 if (bitmap->cluster_slot < 0)
733 md_cluster_stop(bitmap->mddev);
739 * general bitmap file operations
745 * Use one bit per "chunk" (block set). We do the disk I/O on the bitmap
746 * file a page at a time. There's a superblock at the start of the file.
748 /* calculate the index of the page that contains this bit */
749 static inline unsigned long file_page_index(struct bitmap_storage *store,
753 chunk += sizeof(bitmap_super_t) << 3;
754 return chunk >> PAGE_BIT_SHIFT;
757 /* calculate the (bit) offset of this bit within a page */
758 static inline unsigned long file_page_offset(struct bitmap_storage *store,
762 chunk += sizeof(bitmap_super_t) << 3;
763 return chunk & (PAGE_BITS - 1);
767 * return a pointer to the page in the filemap that contains the given bit
770 static inline struct page *filemap_get_page(struct bitmap_storage *store,
773 if (file_page_index(store, chunk) >= store->file_pages)
775 return store->filemap[file_page_index(store, chunk)];
778 static int md_bitmap_storage_alloc(struct bitmap_storage *store,
779 unsigned long chunks, int with_super,
782 int pnum, offset = 0;
783 unsigned long num_pages;
786 bytes = DIV_ROUND_UP(chunks, 8);
788 bytes += sizeof(bitmap_super_t);
790 num_pages = DIV_ROUND_UP(bytes, PAGE_SIZE);
791 offset = slot_number * num_pages;
793 store->filemap = kmalloc_array(num_pages, sizeof(struct page *),
798 if (with_super && !store->sb_page) {
799 store->sb_page = alloc_page(GFP_KERNEL|__GFP_ZERO);
800 if (store->sb_page == NULL)
805 if (store->sb_page) {
806 store->filemap[0] = store->sb_page;
808 store->sb_page->index = offset;
811 for ( ; pnum < num_pages; pnum++) {
812 store->filemap[pnum] = alloc_page(GFP_KERNEL|__GFP_ZERO);
813 if (!store->filemap[pnum]) {
814 store->file_pages = pnum;
817 store->filemap[pnum]->index = pnum + offset;
819 store->file_pages = pnum;
821 /* We need 4 bits per page, rounded up to a multiple
822 * of sizeof(unsigned long) */
823 store->filemap_attr = kzalloc(
824 roundup(DIV_ROUND_UP(num_pages*4, 8), sizeof(unsigned long)),
826 if (!store->filemap_attr)
829 store->bytes = bytes;
834 static void md_bitmap_file_unmap(struct bitmap_storage *store)
836 struct page **map, *sb_page;
841 map = store->filemap;
842 pages = store->file_pages;
843 sb_page = store->sb_page;
846 if (map[pages] != sb_page) /* 0 is sb_page, release it below */
847 free_buffers(map[pages]);
849 kfree(store->filemap_attr);
852 free_buffers(sb_page);
855 struct inode *inode = file_inode(file);
856 invalidate_mapping_pages(inode->i_mapping, 0, -1);
862 * bitmap_file_kick - if an error occurs while manipulating the bitmap file
863 * then it is no longer reliable, so we stop using it and we mark the file
864 * as failed in the superblock
866 static void md_bitmap_file_kick(struct bitmap *bitmap)
868 char *path, *ptr = NULL;
870 if (!test_and_set_bit(BITMAP_STALE, &bitmap->flags)) {
871 md_bitmap_update_sb(bitmap);
873 if (bitmap->storage.file) {
874 path = kmalloc(PAGE_SIZE, GFP_KERNEL);
876 ptr = file_path(bitmap->storage.file,
879 pr_warn("%s: kicking failed bitmap file %s from array!\n",
880 bmname(bitmap), IS_ERR(ptr) ? "" : ptr);
884 pr_warn("%s: disabling internal bitmap due to errors\n",
889 enum bitmap_page_attr {
890 BITMAP_PAGE_DIRTY = 0, /* there are set bits that need to be synced */
891 BITMAP_PAGE_PENDING = 1, /* there are bits that are being cleaned.
892 * i.e. counter is 1 or 2. */
893 BITMAP_PAGE_NEEDWRITE = 2, /* there are cleared bits that need to be synced */
896 static inline void set_page_attr(struct bitmap *bitmap, int pnum,
897 enum bitmap_page_attr attr)
899 set_bit((pnum<<2) + attr, bitmap->storage.filemap_attr);
902 static inline void clear_page_attr(struct bitmap *bitmap, int pnum,
903 enum bitmap_page_attr attr)
905 clear_bit((pnum<<2) + attr, bitmap->storage.filemap_attr);
908 static inline int test_page_attr(struct bitmap *bitmap, int pnum,
909 enum bitmap_page_attr attr)
911 return test_bit((pnum<<2) + attr, bitmap->storage.filemap_attr);
914 static inline int test_and_clear_page_attr(struct bitmap *bitmap, int pnum,
915 enum bitmap_page_attr attr)
917 return test_and_clear_bit((pnum<<2) + attr,
918 bitmap->storage.filemap_attr);
921 * bitmap_file_set_bit -- called before performing a write to the md device
922 * to set (and eventually sync) a particular bit in the bitmap file
924 * we set the bit immediately, then we record the page number so that
925 * when an unplug occurs, we can flush the dirty pages out to disk
927 static void md_bitmap_file_set_bit(struct bitmap *bitmap, sector_t block)
932 unsigned long chunk = block >> bitmap->counts.chunkshift;
933 struct bitmap_storage *store = &bitmap->storage;
934 unsigned long node_offset = 0;
936 if (mddev_is_clustered(bitmap->mddev))
937 node_offset = bitmap->cluster_slot * store->file_pages;
939 page = filemap_get_page(&bitmap->storage, chunk);
942 bit = file_page_offset(&bitmap->storage, chunk);
945 kaddr = kmap_atomic(page);
946 if (test_bit(BITMAP_HOSTENDIAN, &bitmap->flags))
949 set_bit_le(bit, kaddr);
950 kunmap_atomic(kaddr);
951 pr_debug("set file bit %lu page %lu\n", bit, page->index);
952 /* record page number so it gets flushed to disk when unplug occurs */
953 set_page_attr(bitmap, page->index - node_offset, BITMAP_PAGE_DIRTY);
956 static void md_bitmap_file_clear_bit(struct bitmap *bitmap, sector_t block)
961 unsigned long chunk = block >> bitmap->counts.chunkshift;
962 struct bitmap_storage *store = &bitmap->storage;
963 unsigned long node_offset = 0;
965 if (mddev_is_clustered(bitmap->mddev))
966 node_offset = bitmap->cluster_slot * store->file_pages;
968 page = filemap_get_page(&bitmap->storage, chunk);
971 bit = file_page_offset(&bitmap->storage, chunk);
972 paddr = kmap_atomic(page);
973 if (test_bit(BITMAP_HOSTENDIAN, &bitmap->flags))
974 clear_bit(bit, paddr);
976 clear_bit_le(bit, paddr);
977 kunmap_atomic(paddr);
978 if (!test_page_attr(bitmap, page->index - node_offset, BITMAP_PAGE_NEEDWRITE)) {
979 set_page_attr(bitmap, page->index - node_offset, BITMAP_PAGE_PENDING);
980 bitmap->allclean = 0;
984 static int md_bitmap_file_test_bit(struct bitmap *bitmap, sector_t block)
989 unsigned long chunk = block >> bitmap->counts.chunkshift;
992 page = filemap_get_page(&bitmap->storage, chunk);
995 bit = file_page_offset(&bitmap->storage, chunk);
996 paddr = kmap_atomic(page);
997 if (test_bit(BITMAP_HOSTENDIAN, &bitmap->flags))
998 set = test_bit(bit, paddr);
1000 set = test_bit_le(bit, paddr);
1001 kunmap_atomic(paddr);
1006 /* this gets called when the md device is ready to unplug its underlying
1007 * (slave) device queues -- before we let any writes go down, we need to
1008 * sync the dirty pages of the bitmap file to disk */
1009 void md_bitmap_unplug(struct bitmap *bitmap)
1012 int dirty, need_write;
1015 if (!bitmap || !bitmap->storage.filemap ||
1016 test_bit(BITMAP_STALE, &bitmap->flags))
1019 /* look at each page to see if there are any set bits that need to be
1020 * flushed out to disk */
1021 for (i = 0; i < bitmap->storage.file_pages; i++) {
1022 if (!bitmap->storage.filemap)
1024 dirty = test_and_clear_page_attr(bitmap, i, BITMAP_PAGE_DIRTY);
1025 need_write = test_and_clear_page_attr(bitmap, i,
1026 BITMAP_PAGE_NEEDWRITE);
1027 if (dirty || need_write) {
1029 md_bitmap_wait_writes(bitmap);
1030 if (bitmap->mddev->queue)
1031 blk_add_trace_msg(bitmap->mddev->queue,
1032 "md bitmap_unplug");
1034 clear_page_attr(bitmap, i, BITMAP_PAGE_PENDING);
1035 write_page(bitmap, bitmap->storage.filemap[i], 0);
1040 md_bitmap_wait_writes(bitmap);
1042 if (test_bit(BITMAP_WRITE_ERROR, &bitmap->flags))
1043 md_bitmap_file_kick(bitmap);
1045 EXPORT_SYMBOL(md_bitmap_unplug);
1047 static void md_bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset, int needed);
1048 /* * bitmap_init_from_disk -- called at bitmap_create time to initialize
1049 * the in-memory bitmap from the on-disk bitmap -- also, sets up the
1050 * memory mapping of the bitmap file
1052 * if there's no bitmap file, or if the bitmap file had been
1053 * previously kicked from the array, we mark all the bits as
1054 * 1's in order to cause a full resync.
1056 * We ignore all bits for sectors that end earlier than 'start'.
1057 * This is used when reading an out-of-date bitmap...
1059 static int md_bitmap_init_from_disk(struct bitmap *bitmap, sector_t start)
1061 unsigned long i, chunks, index, oldindex, bit, node_offset = 0;
1062 struct page *page = NULL;
1063 unsigned long bit_cnt = 0;
1065 unsigned long offset;
1069 struct bitmap_storage *store = &bitmap->storage;
1071 chunks = bitmap->counts.chunks;
1074 if (!file && !bitmap->mddev->bitmap_info.offset) {
1075 /* No permanent bitmap - fill with '1s'. */
1076 store->filemap = NULL;
1077 store->file_pages = 0;
1078 for (i = 0; i < chunks ; i++) {
1079 /* if the disk bit is set, set the memory bit */
1080 int needed = ((sector_t)(i+1) << (bitmap->counts.chunkshift)
1082 md_bitmap_set_memory_bits(bitmap,
1083 (sector_t)i << bitmap->counts.chunkshift,
1089 outofdate = test_bit(BITMAP_STALE, &bitmap->flags);
1091 pr_warn("%s: bitmap file is out of date, doing full recovery\n", bmname(bitmap));
1093 if (file && i_size_read(file->f_mapping->host) < store->bytes) {
1094 pr_warn("%s: bitmap file too short %lu < %lu\n",
1096 (unsigned long) i_size_read(file->f_mapping->host),
1103 if (!bitmap->mddev->bitmap_info.external)
1104 offset = sizeof(bitmap_super_t);
1106 if (mddev_is_clustered(bitmap->mddev))
1107 node_offset = bitmap->cluster_slot * (DIV_ROUND_UP(store->bytes, PAGE_SIZE));
1109 for (i = 0; i < chunks; i++) {
1111 index = file_page_index(&bitmap->storage, i);
1112 bit = file_page_offset(&bitmap->storage, i);
1113 if (index != oldindex) { /* this is a new page, read it in */
1115 /* unmap the old page, we're done with it */
1116 if (index == store->file_pages-1)
1117 count = store->bytes - index * PAGE_SIZE;
1120 page = store->filemap[index];
1122 ret = read_page(file, index, bitmap,
1127 bitmap->mddev->bitmap_info.offset,
1129 index + node_offset, count);
1138 * if bitmap is out of date, dirty the
1139 * whole page and write it out
1141 paddr = kmap_atomic(page);
1142 memset(paddr + offset, 0xff,
1143 PAGE_SIZE - offset);
1144 kunmap_atomic(paddr);
1145 write_page(bitmap, page, 1);
1148 if (test_bit(BITMAP_WRITE_ERROR,
1153 paddr = kmap_atomic(page);
1154 if (test_bit(BITMAP_HOSTENDIAN, &bitmap->flags))
1155 b = test_bit(bit, paddr);
1157 b = test_bit_le(bit, paddr);
1158 kunmap_atomic(paddr);
1160 /* if the disk bit is set, set the memory bit */
1161 int needed = ((sector_t)(i+1) << bitmap->counts.chunkshift
1163 md_bitmap_set_memory_bits(bitmap,
1164 (sector_t)i << bitmap->counts.chunkshift,
1171 pr_debug("%s: bitmap initialized from disk: read %lu pages, set %lu of %lu bits\n",
1172 bmname(bitmap), store->file_pages,
1178 pr_warn("%s: bitmap initialisation failed: %d\n",
1179 bmname(bitmap), ret);
1183 void md_bitmap_write_all(struct bitmap *bitmap)
1185 /* We don't actually write all bitmap blocks here,
1186 * just flag them as needing to be written
1190 if (!bitmap || !bitmap->storage.filemap)
1192 if (bitmap->storage.file)
1193 /* Only one copy, so nothing needed */
1196 for (i = 0; i < bitmap->storage.file_pages; i++)
1197 set_page_attr(bitmap, i,
1198 BITMAP_PAGE_NEEDWRITE);
1199 bitmap->allclean = 0;
1202 static void md_bitmap_count_page(struct bitmap_counts *bitmap,
1203 sector_t offset, int inc)
1205 sector_t chunk = offset >> bitmap->chunkshift;
1206 unsigned long page = chunk >> PAGE_COUNTER_SHIFT;
1207 bitmap->bp[page].count += inc;
1208 md_bitmap_checkfree(bitmap, page);
1211 static void md_bitmap_set_pending(struct bitmap_counts *bitmap, sector_t offset)
1213 sector_t chunk = offset >> bitmap->chunkshift;
1214 unsigned long page = chunk >> PAGE_COUNTER_SHIFT;
1215 struct bitmap_page *bp = &bitmap->bp[page];
1221 static bitmap_counter_t *md_bitmap_get_counter(struct bitmap_counts *bitmap,
1222 sector_t offset, sector_t *blocks,
1226 * bitmap daemon -- periodically wakes up to clean bits and flush pages
1230 void md_bitmap_daemon_work(struct mddev *mddev)
1232 struct bitmap *bitmap;
1234 unsigned long nextpage;
1236 struct bitmap_counts *counts;
1238 /* Use a mutex to guard daemon_work against
1241 mutex_lock(&mddev->bitmap_info.mutex);
1242 bitmap = mddev->bitmap;
1243 if (bitmap == NULL) {
1244 mutex_unlock(&mddev->bitmap_info.mutex);
1247 if (time_before(jiffies, bitmap->daemon_lastrun
1248 + mddev->bitmap_info.daemon_sleep))
1251 bitmap->daemon_lastrun = jiffies;
1252 if (bitmap->allclean) {
1253 mddev->thread->timeout = MAX_SCHEDULE_TIMEOUT;
1256 bitmap->allclean = 1;
1258 if (bitmap->mddev->queue)
1259 blk_add_trace_msg(bitmap->mddev->queue,
1260 "md bitmap_daemon_work");
1262 /* Any file-page which is PENDING now needs to be written.
1263 * So set NEEDWRITE now, then after we make any last-minute changes
1266 for (j = 0; j < bitmap->storage.file_pages; j++)
1267 if (test_and_clear_page_attr(bitmap, j,
1268 BITMAP_PAGE_PENDING))
1269 set_page_attr(bitmap, j,
1270 BITMAP_PAGE_NEEDWRITE);
1272 if (bitmap->need_sync &&
1273 mddev->bitmap_info.external == 0) {
1274 /* Arrange for superblock update as well as
1277 bitmap->need_sync = 0;
1278 if (bitmap->storage.filemap) {
1279 sb = kmap_atomic(bitmap->storage.sb_page);
1280 sb->events_cleared =
1281 cpu_to_le64(bitmap->events_cleared);
1283 set_page_attr(bitmap, 0,
1284 BITMAP_PAGE_NEEDWRITE);
1287 /* Now look at the bitmap counters and if any are '2' or '1',
1288 * decrement and handle accordingly.
1290 counts = &bitmap->counts;
1291 spin_lock_irq(&counts->lock);
1293 for (j = 0; j < counts->chunks; j++) {
1294 bitmap_counter_t *bmc;
1295 sector_t block = (sector_t)j << counts->chunkshift;
1297 if (j == nextpage) {
1298 nextpage += PAGE_COUNTER_RATIO;
1299 if (!counts->bp[j >> PAGE_COUNTER_SHIFT].pending) {
1300 j |= PAGE_COUNTER_MASK;
1303 counts->bp[j >> PAGE_COUNTER_SHIFT].pending = 0;
1306 bmc = md_bitmap_get_counter(counts, block, &blocks, 0);
1308 j |= PAGE_COUNTER_MASK;
1311 if (*bmc == 1 && !bitmap->need_sync) {
1312 /* We can clear the bit */
1314 md_bitmap_count_page(counts, block, -1);
1315 md_bitmap_file_clear_bit(bitmap, block);
1316 } else if (*bmc && *bmc <= 2) {
1318 md_bitmap_set_pending(counts, block);
1319 bitmap->allclean = 0;
1322 spin_unlock_irq(&counts->lock);
1324 md_bitmap_wait_writes(bitmap);
1325 /* Now start writeout on any page in NEEDWRITE that isn't DIRTY.
1326 * DIRTY pages need to be written by bitmap_unplug so it can wait
1328 * If we find any DIRTY page we stop there and let bitmap_unplug
1329 * handle all the rest. This is important in the case where
1330 * the first blocking holds the superblock and it has been updated.
1331 * We mustn't write any other blocks before the superblock.
1334 j < bitmap->storage.file_pages
1335 && !test_bit(BITMAP_STALE, &bitmap->flags);
1337 if (test_page_attr(bitmap, j,
1339 /* bitmap_unplug will handle the rest */
1341 if (test_and_clear_page_attr(bitmap, j,
1342 BITMAP_PAGE_NEEDWRITE)) {
1343 write_page(bitmap, bitmap->storage.filemap[j], 0);
1348 if (bitmap->allclean == 0)
1349 mddev->thread->timeout =
1350 mddev->bitmap_info.daemon_sleep;
1351 mutex_unlock(&mddev->bitmap_info.mutex);
1354 static bitmap_counter_t *md_bitmap_get_counter(struct bitmap_counts *bitmap,
1355 sector_t offset, sector_t *blocks,
1357 __releases(bitmap->lock)
1358 __acquires(bitmap->lock)
1360 /* If 'create', we might release the lock and reclaim it.
1361 * The lock must have been taken with interrupts enabled.
1362 * If !create, we don't release the lock.
1364 sector_t chunk = offset >> bitmap->chunkshift;
1365 unsigned long page = chunk >> PAGE_COUNTER_SHIFT;
1366 unsigned long pageoff = (chunk & PAGE_COUNTER_MASK) << COUNTER_BYTE_SHIFT;
1370 err = md_bitmap_checkpage(bitmap, page, create, 0);
1372 if (bitmap->bp[page].hijacked ||
1373 bitmap->bp[page].map == NULL)
1374 csize = ((sector_t)1) << (bitmap->chunkshift +
1375 PAGE_COUNTER_SHIFT - 1);
1377 csize = ((sector_t)1) << bitmap->chunkshift;
1378 *blocks = csize - (offset & (csize - 1));
1383 /* now locked ... */
1385 if (bitmap->bp[page].hijacked) { /* hijacked pointer */
1386 /* should we use the first or second counter field
1387 * of the hijacked pointer? */
1388 int hi = (pageoff > PAGE_COUNTER_MASK);
1389 return &((bitmap_counter_t *)
1390 &bitmap->bp[page].map)[hi];
1391 } else /* page is allocated */
1392 return (bitmap_counter_t *)
1393 &(bitmap->bp[page].map[pageoff]);
1396 int md_bitmap_startwrite(struct bitmap *bitmap, sector_t offset, unsigned long sectors, int behind)
1403 atomic_inc(&bitmap->behind_writes);
1404 bw = atomic_read(&bitmap->behind_writes);
1405 if (bw > bitmap->behind_writes_used)
1406 bitmap->behind_writes_used = bw;
1408 pr_debug("inc write-behind count %d/%lu\n",
1409 bw, bitmap->mddev->bitmap_info.max_write_behind);
1414 bitmap_counter_t *bmc;
1416 spin_lock_irq(&bitmap->counts.lock);
1417 bmc = md_bitmap_get_counter(&bitmap->counts, offset, &blocks, 1);
1419 spin_unlock_irq(&bitmap->counts.lock);
1423 if (unlikely(COUNTER(*bmc) == COUNTER_MAX)) {
1424 DEFINE_WAIT(__wait);
1425 /* note that it is safe to do the prepare_to_wait
1426 * after the test as long as we do it before dropping
1429 prepare_to_wait(&bitmap->overflow_wait, &__wait,
1430 TASK_UNINTERRUPTIBLE);
1431 spin_unlock_irq(&bitmap->counts.lock);
1433 finish_wait(&bitmap->overflow_wait, &__wait);
1439 md_bitmap_file_set_bit(bitmap, offset);
1440 md_bitmap_count_page(&bitmap->counts, offset, 1);
1448 spin_unlock_irq(&bitmap->counts.lock);
1451 if (sectors > blocks)
1458 EXPORT_SYMBOL(md_bitmap_startwrite);
1460 void md_bitmap_endwrite(struct bitmap *bitmap, sector_t offset,
1461 unsigned long sectors, int success, int behind)
1466 if (atomic_dec_and_test(&bitmap->behind_writes))
1467 wake_up(&bitmap->behind_wait);
1468 pr_debug("dec write-behind count %d/%lu\n",
1469 atomic_read(&bitmap->behind_writes),
1470 bitmap->mddev->bitmap_info.max_write_behind);
1475 unsigned long flags;
1476 bitmap_counter_t *bmc;
1478 spin_lock_irqsave(&bitmap->counts.lock, flags);
1479 bmc = md_bitmap_get_counter(&bitmap->counts, offset, &blocks, 0);
1481 spin_unlock_irqrestore(&bitmap->counts.lock, flags);
1485 if (success && !bitmap->mddev->degraded &&
1486 bitmap->events_cleared < bitmap->mddev->events) {
1487 bitmap->events_cleared = bitmap->mddev->events;
1488 bitmap->need_sync = 1;
1489 sysfs_notify_dirent_safe(bitmap->sysfs_can_clear);
1492 if (!success && !NEEDED(*bmc))
1493 *bmc |= NEEDED_MASK;
1495 if (COUNTER(*bmc) == COUNTER_MAX)
1496 wake_up(&bitmap->overflow_wait);
1500 md_bitmap_set_pending(&bitmap->counts, offset);
1501 bitmap->allclean = 0;
1503 spin_unlock_irqrestore(&bitmap->counts.lock, flags);
1505 if (sectors > blocks)
1511 EXPORT_SYMBOL(md_bitmap_endwrite);
1513 static int __bitmap_start_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks,
1516 bitmap_counter_t *bmc;
1518 if (bitmap == NULL) {/* FIXME or bitmap set as 'failed' */
1520 return 1; /* always resync if no bitmap */
1522 spin_lock_irq(&bitmap->counts.lock);
1523 bmc = md_bitmap_get_counter(&bitmap->counts, offset, blocks, 0);
1529 else if (NEEDED(*bmc)) {
1531 if (!degraded) { /* don't set/clear bits if degraded */
1532 *bmc |= RESYNC_MASK;
1533 *bmc &= ~NEEDED_MASK;
1537 spin_unlock_irq(&bitmap->counts.lock);
1541 int md_bitmap_start_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks,
1544 /* bitmap_start_sync must always report on multiples of whole
1545 * pages, otherwise resync (which is very PAGE_SIZE based) will
1547 * So call __bitmap_start_sync repeatedly (if needed) until
1548 * At least PAGE_SIZE>>9 blocks are covered.
1549 * Return the 'or' of the result.
1555 while (*blocks < (PAGE_SIZE>>9)) {
1556 rv |= __bitmap_start_sync(bitmap, offset,
1557 &blocks1, degraded);
1563 EXPORT_SYMBOL(md_bitmap_start_sync);
1565 void md_bitmap_end_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks, int aborted)
1567 bitmap_counter_t *bmc;
1568 unsigned long flags;
1570 if (bitmap == NULL) {
1574 spin_lock_irqsave(&bitmap->counts.lock, flags);
1575 bmc = md_bitmap_get_counter(&bitmap->counts, offset, blocks, 0);
1580 *bmc &= ~RESYNC_MASK;
1582 if (!NEEDED(*bmc) && aborted)
1583 *bmc |= NEEDED_MASK;
1586 md_bitmap_set_pending(&bitmap->counts, offset);
1587 bitmap->allclean = 0;
1592 spin_unlock_irqrestore(&bitmap->counts.lock, flags);
1594 EXPORT_SYMBOL(md_bitmap_end_sync);
1596 void md_bitmap_close_sync(struct bitmap *bitmap)
1598 /* Sync has finished, and any bitmap chunks that weren't synced
1599 * properly have been aborted. It remains to us to clear the
1600 * RESYNC bit wherever it is still on
1602 sector_t sector = 0;
1606 while (sector < bitmap->mddev->resync_max_sectors) {
1607 md_bitmap_end_sync(bitmap, sector, &blocks, 0);
1611 EXPORT_SYMBOL(md_bitmap_close_sync);
1613 void md_bitmap_cond_end_sync(struct bitmap *bitmap, sector_t sector, bool force)
1621 bitmap->last_end_sync = jiffies;
1624 if (!force && time_before(jiffies, (bitmap->last_end_sync
1625 + bitmap->mddev->bitmap_info.daemon_sleep)))
1627 wait_event(bitmap->mddev->recovery_wait,
1628 atomic_read(&bitmap->mddev->recovery_active) == 0);
1630 bitmap->mddev->curr_resync_completed = sector;
1631 set_bit(MD_SB_CHANGE_CLEAN, &bitmap->mddev->sb_flags);
1632 sector &= ~((1ULL << bitmap->counts.chunkshift) - 1);
1634 while (s < sector && s < bitmap->mddev->resync_max_sectors) {
1635 md_bitmap_end_sync(bitmap, s, &blocks, 0);
1638 bitmap->last_end_sync = jiffies;
1639 sysfs_notify(&bitmap->mddev->kobj, NULL, "sync_completed");
1641 EXPORT_SYMBOL(md_bitmap_cond_end_sync);
1643 void md_bitmap_sync_with_cluster(struct mddev *mddev,
1644 sector_t old_lo, sector_t old_hi,
1645 sector_t new_lo, sector_t new_hi)
1647 struct bitmap *bitmap = mddev->bitmap;
1648 sector_t sector, blocks = 0;
1650 for (sector = old_lo; sector < new_lo; ) {
1651 md_bitmap_end_sync(bitmap, sector, &blocks, 0);
1654 WARN((blocks > new_lo) && old_lo, "alignment is not correct for lo\n");
1656 for (sector = old_hi; sector < new_hi; ) {
1657 md_bitmap_start_sync(bitmap, sector, &blocks, 0);
1660 WARN((blocks > new_hi) && old_hi, "alignment is not correct for hi\n");
1662 EXPORT_SYMBOL(md_bitmap_sync_with_cluster);
1664 static void md_bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset, int needed)
1666 /* For each chunk covered by any of these sectors, set the
1667 * counter to 2 and possibly set resync_needed. They should all
1668 * be 0 at this point
1672 bitmap_counter_t *bmc;
1673 spin_lock_irq(&bitmap->counts.lock);
1674 bmc = md_bitmap_get_counter(&bitmap->counts, offset, &secs, 1);
1676 spin_unlock_irq(&bitmap->counts.lock);
1681 md_bitmap_count_page(&bitmap->counts, offset, 1);
1682 md_bitmap_set_pending(&bitmap->counts, offset);
1683 bitmap->allclean = 0;
1686 *bmc |= NEEDED_MASK;
1687 spin_unlock_irq(&bitmap->counts.lock);
1690 /* dirty the memory and file bits for bitmap chunks "s" to "e" */
1691 void md_bitmap_dirty_bits(struct bitmap *bitmap, unsigned long s, unsigned long e)
1693 unsigned long chunk;
1695 for (chunk = s; chunk <= e; chunk++) {
1696 sector_t sec = (sector_t)chunk << bitmap->counts.chunkshift;
1697 md_bitmap_set_memory_bits(bitmap, sec, 1);
1698 md_bitmap_file_set_bit(bitmap, sec);
1699 if (sec < bitmap->mddev->recovery_cp)
1700 /* We are asserting that the array is dirty,
1701 * so move the recovery_cp address back so
1702 * that it is obvious that it is dirty
1704 bitmap->mddev->recovery_cp = sec;
1709 * flush out any pending updates
1711 void md_bitmap_flush(struct mddev *mddev)
1713 struct bitmap *bitmap = mddev->bitmap;
1716 if (!bitmap) /* there was no bitmap */
1719 /* run the daemon_work three time to ensure everything is flushed
1722 sleep = mddev->bitmap_info.daemon_sleep * 2;
1723 bitmap->daemon_lastrun -= sleep;
1724 md_bitmap_daemon_work(mddev);
1725 bitmap->daemon_lastrun -= sleep;
1726 md_bitmap_daemon_work(mddev);
1727 bitmap->daemon_lastrun -= sleep;
1728 md_bitmap_daemon_work(mddev);
1729 md_bitmap_update_sb(bitmap);
1733 * free memory that was allocated
1735 void md_bitmap_free(struct bitmap *bitmap)
1737 unsigned long k, pages;
1738 struct bitmap_page *bp;
1740 if (!bitmap) /* there was no bitmap */
1743 if (bitmap->sysfs_can_clear)
1744 sysfs_put(bitmap->sysfs_can_clear);
1746 if (mddev_is_clustered(bitmap->mddev) && bitmap->mddev->cluster_info &&
1747 bitmap->cluster_slot == md_cluster_ops->slot_number(bitmap->mddev))
1748 md_cluster_stop(bitmap->mddev);
1750 /* Shouldn't be needed - but just in case.... */
1751 wait_event(bitmap->write_wait,
1752 atomic_read(&bitmap->pending_writes) == 0);
1754 /* release the bitmap file */
1755 md_bitmap_file_unmap(&bitmap->storage);
1757 bp = bitmap->counts.bp;
1758 pages = bitmap->counts.pages;
1760 /* free all allocated memory */
1762 if (bp) /* deallocate the page memory */
1763 for (k = 0; k < pages; k++)
1764 if (bp[k].map && !bp[k].hijacked)
1769 EXPORT_SYMBOL(md_bitmap_free);
1771 void md_bitmap_wait_behind_writes(struct mddev *mddev)
1773 struct bitmap *bitmap = mddev->bitmap;
1775 /* wait for behind writes to complete */
1776 if (bitmap && atomic_read(&bitmap->behind_writes) > 0) {
1777 pr_debug("md:%s: behind writes in progress - waiting to stop.\n",
1779 /* need to kick something here to make sure I/O goes? */
1780 wait_event(bitmap->behind_wait,
1781 atomic_read(&bitmap->behind_writes) == 0);
1785 void md_bitmap_destroy(struct mddev *mddev)
1787 struct bitmap *bitmap = mddev->bitmap;
1789 if (!bitmap) /* there was no bitmap */
1792 md_bitmap_wait_behind_writes(mddev);
1793 mempool_destroy(mddev->wb_info_pool);
1794 mddev->wb_info_pool = NULL;
1796 mutex_lock(&mddev->bitmap_info.mutex);
1797 spin_lock(&mddev->lock);
1798 mddev->bitmap = NULL; /* disconnect from the md device */
1799 spin_unlock(&mddev->lock);
1800 mutex_unlock(&mddev->bitmap_info.mutex);
1802 mddev->thread->timeout = MAX_SCHEDULE_TIMEOUT;
1804 md_bitmap_free(bitmap);
1808 * initialize the bitmap structure
1809 * if this returns an error, bitmap_destroy must be called to do clean up
1810 * once mddev->bitmap is set
1812 struct bitmap *md_bitmap_create(struct mddev *mddev, int slot)
1814 struct bitmap *bitmap;
1815 sector_t blocks = mddev->resync_max_sectors;
1816 struct file *file = mddev->bitmap_info.file;
1818 struct kernfs_node *bm = NULL;
1820 BUILD_BUG_ON(sizeof(bitmap_super_t) != 256);
1822 BUG_ON(file && mddev->bitmap_info.offset);
1824 if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) {
1825 pr_notice("md/raid:%s: array with journal cannot have bitmap\n",
1827 return ERR_PTR(-EBUSY);
1830 bitmap = kzalloc(sizeof(*bitmap), GFP_KERNEL);
1832 return ERR_PTR(-ENOMEM);
1834 spin_lock_init(&bitmap->counts.lock);
1835 atomic_set(&bitmap->pending_writes, 0);
1836 init_waitqueue_head(&bitmap->write_wait);
1837 init_waitqueue_head(&bitmap->overflow_wait);
1838 init_waitqueue_head(&bitmap->behind_wait);
1840 bitmap->mddev = mddev;
1841 bitmap->cluster_slot = slot;
1844 bm = sysfs_get_dirent(mddev->kobj.sd, "bitmap");
1846 bitmap->sysfs_can_clear = sysfs_get_dirent(bm, "can_clear");
1849 bitmap->sysfs_can_clear = NULL;
1851 bitmap->storage.file = file;
1854 /* As future accesses to this file will use bmap,
1855 * and bypass the page cache, we must sync the file
1860 /* read superblock from bitmap file (this sets mddev->bitmap_info.chunksize) */
1861 if (!mddev->bitmap_info.external) {
1863 * If 'MD_ARRAY_FIRST_USE' is set, then device-mapper is
1864 * instructing us to create a new on-disk bitmap instance.
1866 if (test_and_clear_bit(MD_ARRAY_FIRST_USE, &mddev->flags))
1867 err = md_bitmap_new_disk_sb(bitmap);
1869 err = md_bitmap_read_sb(bitmap);
1872 if (mddev->bitmap_info.chunksize == 0 ||
1873 mddev->bitmap_info.daemon_sleep == 0)
1874 /* chunksize and time_base need to be
1881 bitmap->daemon_lastrun = jiffies;
1882 err = md_bitmap_resize(bitmap, blocks, mddev->bitmap_info.chunksize, 1);
1886 pr_debug("created bitmap (%lu pages) for device %s\n",
1887 bitmap->counts.pages, bmname(bitmap));
1889 err = test_bit(BITMAP_WRITE_ERROR, &bitmap->flags) ? -EIO : 0;
1895 md_bitmap_free(bitmap);
1896 return ERR_PTR(err);
1899 int md_bitmap_load(struct mddev *mddev)
1903 sector_t sector = 0;
1904 struct bitmap *bitmap = mddev->bitmap;
1905 struct md_rdev *rdev;
1910 rdev_for_each(rdev, mddev)
1911 mddev_create_wb_pool(mddev, rdev, true);
1913 if (mddev_is_clustered(mddev))
1914 md_cluster_ops->load_bitmaps(mddev, mddev->bitmap_info.nodes);
1916 /* Clear out old bitmap info first: Either there is none, or we
1917 * are resuming after someone else has possibly changed things,
1918 * so we should forget old cached info.
1919 * All chunks should be clean, but some might need_sync.
1921 while (sector < mddev->resync_max_sectors) {
1923 md_bitmap_start_sync(bitmap, sector, &blocks, 0);
1926 md_bitmap_close_sync(bitmap);
1928 if (mddev->degraded == 0
1929 || bitmap->events_cleared == mddev->events)
1930 /* no need to keep dirty bits to optimise a
1931 * re-add of a missing device */
1932 start = mddev->recovery_cp;
1934 mutex_lock(&mddev->bitmap_info.mutex);
1935 err = md_bitmap_init_from_disk(bitmap, start);
1936 mutex_unlock(&mddev->bitmap_info.mutex);
1940 clear_bit(BITMAP_STALE, &bitmap->flags);
1942 /* Kick recovery in case any bits were set */
1943 set_bit(MD_RECOVERY_NEEDED, &bitmap->mddev->recovery);
1945 mddev->thread->timeout = mddev->bitmap_info.daemon_sleep;
1946 md_wakeup_thread(mddev->thread);
1948 md_bitmap_update_sb(bitmap);
1950 if (test_bit(BITMAP_WRITE_ERROR, &bitmap->flags))
1955 EXPORT_SYMBOL_GPL(md_bitmap_load);
1957 struct bitmap *get_bitmap_from_slot(struct mddev *mddev, int slot)
1960 struct bitmap *bitmap;
1962 bitmap = md_bitmap_create(mddev, slot);
1963 if (IS_ERR(bitmap)) {
1964 rv = PTR_ERR(bitmap);
1968 rv = md_bitmap_init_from_disk(bitmap, 0);
1970 md_bitmap_free(bitmap);
1976 EXPORT_SYMBOL(get_bitmap_from_slot);
1978 /* Loads the bitmap associated with slot and copies the resync information
1981 int md_bitmap_copy_from_slot(struct mddev *mddev, int slot,
1982 sector_t *low, sector_t *high, bool clear_bits)
1985 sector_t block, lo = 0, hi = 0;
1986 struct bitmap_counts *counts;
1987 struct bitmap *bitmap;
1989 bitmap = get_bitmap_from_slot(mddev, slot);
1990 if (IS_ERR(bitmap)) {
1991 pr_err("%s can't get bitmap from slot %d\n", __func__, slot);
1995 counts = &bitmap->counts;
1996 for (j = 0; j < counts->chunks; j++) {
1997 block = (sector_t)j << counts->chunkshift;
1998 if (md_bitmap_file_test_bit(bitmap, block)) {
2002 md_bitmap_file_clear_bit(bitmap, block);
2003 md_bitmap_set_memory_bits(mddev->bitmap, block, 1);
2004 md_bitmap_file_set_bit(mddev->bitmap, block);
2009 md_bitmap_update_sb(bitmap);
2010 /* BITMAP_PAGE_PENDING is set, but bitmap_unplug needs
2011 * BITMAP_PAGE_DIRTY or _NEEDWRITE to write ... */
2012 for (i = 0; i < bitmap->storage.file_pages; i++)
2013 if (test_page_attr(bitmap, i, BITMAP_PAGE_PENDING))
2014 set_page_attr(bitmap, i, BITMAP_PAGE_NEEDWRITE);
2015 md_bitmap_unplug(bitmap);
2017 md_bitmap_unplug(mddev->bitmap);
2023 EXPORT_SYMBOL_GPL(md_bitmap_copy_from_slot);
2026 void md_bitmap_status(struct seq_file *seq, struct bitmap *bitmap)
2028 unsigned long chunk_kb;
2029 struct bitmap_counts *counts;
2034 counts = &bitmap->counts;
2036 chunk_kb = bitmap->mddev->bitmap_info.chunksize >> 10;
2037 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
2039 counts->pages - counts->missing_pages,
2041 (counts->pages - counts->missing_pages)
2042 << (PAGE_SHIFT - 10),
2043 chunk_kb ? chunk_kb : bitmap->mddev->bitmap_info.chunksize,
2044 chunk_kb ? "KB" : "B");
2045 if (bitmap->storage.file) {
2046 seq_printf(seq, ", file: ");
2047 seq_file_path(seq, bitmap->storage.file, " \t\n");
2050 seq_printf(seq, "\n");
2053 int md_bitmap_resize(struct bitmap *bitmap, sector_t blocks,
2054 int chunksize, int init)
2056 /* If chunk_size is 0, choose an appropriate chunk size.
2057 * Then possibly allocate new storage space.
2058 * Then quiesce, copy bits, replace bitmap, and re-start
2060 * This function is called both to set up the initial bitmap
2061 * and to resize the bitmap while the array is active.
2062 * If this happens as a result of the array being resized,
2063 * chunksize will be zero, and we need to choose a suitable
2064 * chunksize, otherwise we use what we are given.
2066 struct bitmap_storage store;
2067 struct bitmap_counts old_counts;
2068 unsigned long chunks;
2070 sector_t old_blocks, new_blocks;
2074 struct bitmap_page *new_bp;
2076 if (bitmap->storage.file && !init) {
2077 pr_info("md: cannot resize file-based bitmap\n");
2081 if (chunksize == 0) {
2082 /* If there is enough space, leave the chunk size unchanged,
2083 * else increase by factor of two until there is enough space.
2086 long space = bitmap->mddev->bitmap_info.space;
2089 /* We don't know how much space there is, so limit
2090 * to current size - in sectors.
2092 bytes = DIV_ROUND_UP(bitmap->counts.chunks, 8);
2093 if (!bitmap->mddev->bitmap_info.external)
2094 bytes += sizeof(bitmap_super_t);
2095 space = DIV_ROUND_UP(bytes, 512);
2096 bitmap->mddev->bitmap_info.space = space;
2098 chunkshift = bitmap->counts.chunkshift;
2101 /* 'chunkshift' is shift from block size to chunk size */
2103 chunks = DIV_ROUND_UP_SECTOR_T(blocks, 1 << chunkshift);
2104 bytes = DIV_ROUND_UP(chunks, 8);
2105 if (!bitmap->mddev->bitmap_info.external)
2106 bytes += sizeof(bitmap_super_t);
2107 } while (bytes > (space << 9));
2109 chunkshift = ffz(~chunksize) - BITMAP_BLOCK_SHIFT;
2111 chunks = DIV_ROUND_UP_SECTOR_T(blocks, 1 << chunkshift);
2112 memset(&store, 0, sizeof(store));
2113 if (bitmap->mddev->bitmap_info.offset || bitmap->mddev->bitmap_info.file)
2114 ret = md_bitmap_storage_alloc(&store, chunks,
2115 !bitmap->mddev->bitmap_info.external,
2116 mddev_is_clustered(bitmap->mddev)
2117 ? bitmap->cluster_slot : 0);
2119 md_bitmap_file_unmap(&store);
2123 pages = DIV_ROUND_UP(chunks, PAGE_COUNTER_RATIO);
2125 new_bp = kcalloc(pages, sizeof(*new_bp), GFP_KERNEL);
2128 md_bitmap_file_unmap(&store);
2133 bitmap->mddev->pers->quiesce(bitmap->mddev, 1);
2135 store.file = bitmap->storage.file;
2136 bitmap->storage.file = NULL;
2138 if (store.sb_page && bitmap->storage.sb_page)
2139 memcpy(page_address(store.sb_page),
2140 page_address(bitmap->storage.sb_page),
2141 sizeof(bitmap_super_t));
2142 spin_lock_irq(&bitmap->counts.lock);
2143 md_bitmap_file_unmap(&bitmap->storage);
2144 bitmap->storage = store;
2146 old_counts = bitmap->counts;
2147 bitmap->counts.bp = new_bp;
2148 bitmap->counts.pages = pages;
2149 bitmap->counts.missing_pages = pages;
2150 bitmap->counts.chunkshift = chunkshift;
2151 bitmap->counts.chunks = chunks;
2152 bitmap->mddev->bitmap_info.chunksize = 1 << (chunkshift +
2153 BITMAP_BLOCK_SHIFT);
2155 blocks = min(old_counts.chunks << old_counts.chunkshift,
2156 chunks << chunkshift);
2158 /* For cluster raid, need to pre-allocate bitmap */
2159 if (mddev_is_clustered(bitmap->mddev)) {
2161 for (page = 0; page < pages; page++) {
2162 ret = md_bitmap_checkpage(&bitmap->counts, page, 1, 1);
2166 /* deallocate the page memory */
2167 for (k = 0; k < page; k++) {
2168 kfree(new_bp[k].map);
2172 /* restore some fields from old_counts */
2173 bitmap->counts.bp = old_counts.bp;
2174 bitmap->counts.pages = old_counts.pages;
2175 bitmap->counts.missing_pages = old_counts.pages;
2176 bitmap->counts.chunkshift = old_counts.chunkshift;
2177 bitmap->counts.chunks = old_counts.chunks;
2178 bitmap->mddev->bitmap_info.chunksize = 1 << (old_counts.chunkshift +
2179 BITMAP_BLOCK_SHIFT);
2180 blocks = old_counts.chunks << old_counts.chunkshift;
2181 pr_warn("Could not pre-allocate in-memory bitmap for cluster raid\n");
2184 bitmap->counts.bp[page].count += 1;
2188 for (block = 0; block < blocks; ) {
2189 bitmap_counter_t *bmc_old, *bmc_new;
2192 bmc_old = md_bitmap_get_counter(&old_counts, block, &old_blocks, 0);
2193 set = bmc_old && NEEDED(*bmc_old);
2196 bmc_new = md_bitmap_get_counter(&bitmap->counts, block, &new_blocks, 1);
2197 if (*bmc_new == 0) {
2198 /* need to set on-disk bits too. */
2199 sector_t end = block + new_blocks;
2200 sector_t start = block >> chunkshift;
2201 start <<= chunkshift;
2202 while (start < end) {
2203 md_bitmap_file_set_bit(bitmap, block);
2204 start += 1 << chunkshift;
2207 md_bitmap_count_page(&bitmap->counts, block, 1);
2208 md_bitmap_set_pending(&bitmap->counts, block);
2210 *bmc_new |= NEEDED_MASK;
2211 if (new_blocks < old_blocks)
2212 old_blocks = new_blocks;
2214 block += old_blocks;
2217 if (bitmap->counts.bp != old_counts.bp) {
2219 for (k = 0; k < old_counts.pages; k++)
2220 if (!old_counts.bp[k].hijacked)
2221 kfree(old_counts.bp[k].map);
2222 kfree(old_counts.bp);
2227 while (block < (chunks << chunkshift)) {
2228 bitmap_counter_t *bmc;
2229 bmc = md_bitmap_get_counter(&bitmap->counts, block, &new_blocks, 1);
2231 /* new space. It needs to be resynced, so
2232 * we set NEEDED_MASK.
2235 *bmc = NEEDED_MASK | 2;
2236 md_bitmap_count_page(&bitmap->counts, block, 1);
2237 md_bitmap_set_pending(&bitmap->counts, block);
2240 block += new_blocks;
2242 for (i = 0; i < bitmap->storage.file_pages; i++)
2243 set_page_attr(bitmap, i, BITMAP_PAGE_DIRTY);
2245 spin_unlock_irq(&bitmap->counts.lock);
2248 md_bitmap_unplug(bitmap);
2249 bitmap->mddev->pers->quiesce(bitmap->mddev, 0);
2255 EXPORT_SYMBOL_GPL(md_bitmap_resize);
2258 location_show(struct mddev *mddev, char *page)
2261 if (mddev->bitmap_info.file)
2262 len = sprintf(page, "file");
2263 else if (mddev->bitmap_info.offset)
2264 len = sprintf(page, "%+lld", (long long)mddev->bitmap_info.offset);
2266 len = sprintf(page, "none");
2267 len += sprintf(page+len, "\n");
2272 location_store(struct mddev *mddev, const char *buf, size_t len)
2276 rv = mddev_lock(mddev);
2280 if (!mddev->pers->quiesce) {
2284 if (mddev->recovery || mddev->sync_thread) {
2290 if (mddev->bitmap || mddev->bitmap_info.file ||
2291 mddev->bitmap_info.offset) {
2292 /* bitmap already configured. Only option is to clear it */
2293 if (strncmp(buf, "none", 4) != 0) {
2298 mddev_suspend(mddev);
2299 md_bitmap_destroy(mddev);
2300 mddev_resume(mddev);
2302 mddev->bitmap_info.offset = 0;
2303 if (mddev->bitmap_info.file) {
2304 struct file *f = mddev->bitmap_info.file;
2305 mddev->bitmap_info.file = NULL;
2309 /* No bitmap, OK to set a location */
2311 if (strncmp(buf, "none", 4) == 0)
2312 /* nothing to be done */;
2313 else if (strncmp(buf, "file:", 5) == 0) {
2314 /* Not supported yet */
2319 rv = kstrtoll(buf+1, 10, &offset);
2321 rv = kstrtoll(buf, 10, &offset);
2328 if (mddev->bitmap_info.external == 0 &&
2329 mddev->major_version == 0 &&
2330 offset != mddev->bitmap_info.default_offset) {
2334 mddev->bitmap_info.offset = offset;
2336 struct bitmap *bitmap;
2337 bitmap = md_bitmap_create(mddev, -1);
2338 mddev_suspend(mddev);
2340 rv = PTR_ERR(bitmap);
2342 mddev->bitmap = bitmap;
2343 rv = md_bitmap_load(mddev);
2345 mddev->bitmap_info.offset = 0;
2348 md_bitmap_destroy(mddev);
2349 mddev_resume(mddev);
2352 mddev_resume(mddev);
2356 if (!mddev->external) {
2357 /* Ensure new bitmap info is stored in
2358 * metadata promptly.
2360 set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
2361 md_wakeup_thread(mddev->thread);
2365 mddev_unlock(mddev);
2371 static struct md_sysfs_entry bitmap_location =
2372 __ATTR(location, S_IRUGO|S_IWUSR, location_show, location_store);
2374 /* 'bitmap/space' is the space available at 'location' for the
2375 * bitmap. This allows the kernel to know when it is safe to
2376 * resize the bitmap to match a resized array.
2379 space_show(struct mddev *mddev, char *page)
2381 return sprintf(page, "%lu\n", mddev->bitmap_info.space);
2385 space_store(struct mddev *mddev, const char *buf, size_t len)
2387 unsigned long sectors;
2390 rv = kstrtoul(buf, 10, §ors);
2397 if (mddev->bitmap &&
2398 sectors < (mddev->bitmap->storage.bytes + 511) >> 9)
2399 return -EFBIG; /* Bitmap is too big for this small space */
2401 /* could make sure it isn't too big, but that isn't really
2402 * needed - user-space should be careful.
2404 mddev->bitmap_info.space = sectors;
2408 static struct md_sysfs_entry bitmap_space =
2409 __ATTR(space, S_IRUGO|S_IWUSR, space_show, space_store);
2412 timeout_show(struct mddev *mddev, char *page)
2415 unsigned long secs = mddev->bitmap_info.daemon_sleep / HZ;
2416 unsigned long jifs = mddev->bitmap_info.daemon_sleep % HZ;
2418 len = sprintf(page, "%lu", secs);
2420 len += sprintf(page+len, ".%03u", jiffies_to_msecs(jifs));
2421 len += sprintf(page+len, "\n");
2426 timeout_store(struct mddev *mddev, const char *buf, size_t len)
2428 /* timeout can be set at any time */
2429 unsigned long timeout;
2430 int rv = strict_strtoul_scaled(buf, &timeout, 4);
2434 /* just to make sure we don't overflow... */
2435 if (timeout >= LONG_MAX / HZ)
2438 timeout = timeout * HZ / 10000;
2440 if (timeout >= MAX_SCHEDULE_TIMEOUT)
2441 timeout = MAX_SCHEDULE_TIMEOUT-1;
2444 mddev->bitmap_info.daemon_sleep = timeout;
2445 if (mddev->thread) {
2446 /* if thread->timeout is MAX_SCHEDULE_TIMEOUT, then
2447 * the bitmap is all clean and we don't need to
2448 * adjust the timeout right now
2450 if (mddev->thread->timeout < MAX_SCHEDULE_TIMEOUT) {
2451 mddev->thread->timeout = timeout;
2452 md_wakeup_thread(mddev->thread);
2458 static struct md_sysfs_entry bitmap_timeout =
2459 __ATTR(time_base, S_IRUGO|S_IWUSR, timeout_show, timeout_store);
2462 backlog_show(struct mddev *mddev, char *page)
2464 return sprintf(page, "%lu\n", mddev->bitmap_info.max_write_behind);
2468 backlog_store(struct mddev *mddev, const char *buf, size_t len)
2470 unsigned long backlog;
2471 unsigned long old_mwb = mddev->bitmap_info.max_write_behind;
2472 int rv = kstrtoul(buf, 10, &backlog);
2475 if (backlog > COUNTER_MAX)
2477 mddev->bitmap_info.max_write_behind = backlog;
2478 if (!backlog && mddev->wb_info_pool) {
2479 /* wb_info_pool is not needed if backlog is zero */
2480 mempool_destroy(mddev->wb_info_pool);
2481 mddev->wb_info_pool = NULL;
2482 } else if (backlog && !mddev->wb_info_pool) {
2483 /* wb_info_pool is needed since backlog is not zero */
2484 struct md_rdev *rdev;
2486 rdev_for_each(rdev, mddev)
2487 mddev_create_wb_pool(mddev, rdev, false);
2489 if (old_mwb != backlog)
2490 md_bitmap_update_sb(mddev->bitmap);
2494 static struct md_sysfs_entry bitmap_backlog =
2495 __ATTR(backlog, S_IRUGO|S_IWUSR, backlog_show, backlog_store);
2498 chunksize_show(struct mddev *mddev, char *page)
2500 return sprintf(page, "%lu\n", mddev->bitmap_info.chunksize);
2504 chunksize_store(struct mddev *mddev, const char *buf, size_t len)
2506 /* Can only be changed when no bitmap is active */
2508 unsigned long csize;
2511 rv = kstrtoul(buf, 10, &csize);
2515 !is_power_of_2(csize))
2517 mddev->bitmap_info.chunksize = csize;
2521 static struct md_sysfs_entry bitmap_chunksize =
2522 __ATTR(chunksize, S_IRUGO|S_IWUSR, chunksize_show, chunksize_store);
2524 static ssize_t metadata_show(struct mddev *mddev, char *page)
2526 if (mddev_is_clustered(mddev))
2527 return sprintf(page, "clustered\n");
2528 return sprintf(page, "%s\n", (mddev->bitmap_info.external
2529 ? "external" : "internal"));
2532 static ssize_t metadata_store(struct mddev *mddev, const char *buf, size_t len)
2534 if (mddev->bitmap ||
2535 mddev->bitmap_info.file ||
2536 mddev->bitmap_info.offset)
2538 if (strncmp(buf, "external", 8) == 0)
2539 mddev->bitmap_info.external = 1;
2540 else if ((strncmp(buf, "internal", 8) == 0) ||
2541 (strncmp(buf, "clustered", 9) == 0))
2542 mddev->bitmap_info.external = 0;
2548 static struct md_sysfs_entry bitmap_metadata =
2549 __ATTR(metadata, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
2551 static ssize_t can_clear_show(struct mddev *mddev, char *page)
2554 spin_lock(&mddev->lock);
2556 len = sprintf(page, "%s\n", (mddev->bitmap->need_sync ?
2559 len = sprintf(page, "\n");
2560 spin_unlock(&mddev->lock);
2564 static ssize_t can_clear_store(struct mddev *mddev, const char *buf, size_t len)
2566 if (mddev->bitmap == NULL)
2568 if (strncmp(buf, "false", 5) == 0)
2569 mddev->bitmap->need_sync = 1;
2570 else if (strncmp(buf, "true", 4) == 0) {
2571 if (mddev->degraded)
2573 mddev->bitmap->need_sync = 0;
2579 static struct md_sysfs_entry bitmap_can_clear =
2580 __ATTR(can_clear, S_IRUGO|S_IWUSR, can_clear_show, can_clear_store);
2583 behind_writes_used_show(struct mddev *mddev, char *page)
2586 spin_lock(&mddev->lock);
2587 if (mddev->bitmap == NULL)
2588 ret = sprintf(page, "0\n");
2590 ret = sprintf(page, "%lu\n",
2591 mddev->bitmap->behind_writes_used);
2592 spin_unlock(&mddev->lock);
2597 behind_writes_used_reset(struct mddev *mddev, const char *buf, size_t len)
2600 mddev->bitmap->behind_writes_used = 0;
2604 static struct md_sysfs_entry max_backlog_used =
2605 __ATTR(max_backlog_used, S_IRUGO | S_IWUSR,
2606 behind_writes_used_show, behind_writes_used_reset);
2608 static struct attribute *md_bitmap_attrs[] = {
2609 &bitmap_location.attr,
2611 &bitmap_timeout.attr,
2612 &bitmap_backlog.attr,
2613 &bitmap_chunksize.attr,
2614 &bitmap_metadata.attr,
2615 &bitmap_can_clear.attr,
2616 &max_backlog_used.attr,
2619 struct attribute_group md_bitmap_group = {
2621 .attrs = md_bitmap_attrs,