37 	return bitmap->mddev ? mdname(bitmap->mddev) : "mdX";  in bmname()
149 static int read_sb_page(struct mddev *mddev, loff_t offset,  in read_sb_page()  argument
158 	rdev_for_each(rdev, mddev) {  in read_sb_page()
176 static struct md_rdev *next_active_rdev(struct md_rdev *rdev, struct mddev *mddev)  in next_active_rdev()  argument
194 		rdev = list_entry(&mddev->disks, struct md_rdev, same_set);  in next_active_rdev()
197 		rdev_dec_pending(rdev, mddev);  in next_active_rdev()
199 	list_for_each_entry_continue_rcu(rdev, &mddev->disks, same_set) {  in next_active_rdev()
216 	struct mddev *mddev = bitmap->mddev;  in write_sb_page()  local
221 	while ((rdev = next_active_rdev(rdev, mddev)) != NULL) {  in write_sb_page()
223 		loff_t offset = mddev->bitmap_info.offset;  in write_sb_page()
237 		if (mddev->external) {  in write_sb_page()
244 			    < (rdev->data_offset + mddev->dev_sectors  in write_sb_page()
254 			if (rdev->data_offset + mddev->dev_sectors  in write_sb_page()
269 		md_super_write(mddev, rdev,  in write_sb_page()
276 	if (wait && md_super_wait(mddev) < 0)  in write_sb_page()
439 		md_super_wait(bitmap->mddev);  in md_bitmap_wait_writes()
448 	if (!bitmap || !bitmap->mddev) /* no bitmap for this array */  in md_bitmap_update_sb()
450 	if (bitmap->mddev->bitmap_info.external)  in md_bitmap_update_sb()
455 	sb->events = cpu_to_le64(bitmap->mddev->events);  in md_bitmap_update_sb()
456 	if (bitmap->mddev->events < bitmap->events_cleared)  in md_bitmap_update_sb()
458 		bitmap->events_cleared = bitmap->mddev->events;  in md_bitmap_update_sb()
466 	sb->daemon_sleep = cpu_to_le32(bitmap->mddev->bitmap_info.daemon_sleep/HZ);  in md_bitmap_update_sb()
467 	sb->write_behind = cpu_to_le32(bitmap->mddev->bitmap_info.max_write_behind);  in md_bitmap_update_sb()
469 	sb->sync_size = cpu_to_le64(bitmap->mddev->resync_max_sectors);  in md_bitmap_update_sb()
470 	sb->chunksize = cpu_to_le32(bitmap->mddev->bitmap_info.chunksize);  in md_bitmap_update_sb()
471 	sb->nodes = cpu_to_le32(bitmap->mddev->bitmap_info.nodes);  in md_bitmap_update_sb()
472 	sb->sectors_reserved = cpu_to_le32(bitmap->mddev->  in md_bitmap_update_sb()
534 	chunksize = bitmap->mddev->bitmap_info.chunksize;  in md_bitmap_new_disk_sb()
543 	daemon_sleep = bitmap->mddev->bitmap_info.daemon_sleep;  in md_bitmap_new_disk_sb()
549 	bitmap->mddev->bitmap_info.daemon_sleep = daemon_sleep;  in md_bitmap_new_disk_sb()
555 	write_behind = bitmap->mddev->bitmap_info.max_write_behind;  in md_bitmap_new_disk_sb()
559 	bitmap->mddev->bitmap_info.max_write_behind = write_behind;  in md_bitmap_new_disk_sb()
562 	sb->sync_size = cpu_to_le64(bitmap->mddev->resync_max_sectors);  in md_bitmap_new_disk_sb()
564 	memcpy(sb->uuid, bitmap->mddev->uuid, 16);  in md_bitmap_new_disk_sb()
568 	bitmap->events_cleared = bitmap->mddev->events;  in md_bitmap_new_disk_sb()
569 	sb->events_cleared = cpu_to_le64(bitmap->mddev->events);  in md_bitmap_new_disk_sb()
570 	bitmap->mddev->bitmap_info.nodes = 0;  in md_bitmap_new_disk_sb()
588 	loff_t offset = bitmap->mddev->bitmap_info.offset;  in md_bitmap_read_sb()
590 	if (!bitmap->storage.file && !bitmap->mddev->bitmap_info.offset) {  in md_bitmap_read_sb()
607 		sector_t bm_blocks = bitmap->mddev->resync_max_sectors;  in md_bitmap_read_sb()
610 			   (bitmap->mddev->bitmap_info.chunksize >> 9));  in md_bitmap_read_sb()
615 		offset = bitmap->mddev->bitmap_info.offset + (bitmap->cluster_slot * (bm_blocks << 3));  in md_bitmap_read_sb()
627 		err = read_sb_page(bitmap->mddev,  in md_bitmap_read_sb()
647 		strlcpy(bitmap->mddev->bitmap_info.cluster_name,  in md_bitmap_read_sb()
672 	sb->sync_size = cpu_to_le64(bitmap->mddev->resync_max_sectors);  in md_bitmap_read_sb()
674 	if (bitmap->mddev->persistent) {  in md_bitmap_read_sb()
679 		if (memcmp(sb->uuid, bitmap->mddev->uuid, 16)) {  in md_bitmap_read_sb()
685 		if (!nodes && (events < bitmap->mddev->events)) {  in md_bitmap_read_sb()
688 				(unsigned long long) bitmap->mddev->events);  in md_bitmap_read_sb()
698 	strlcpy(bitmap->mddev->bitmap_info.cluster_name, sb->cluster_name, 64);  in md_bitmap_read_sb()
704 	bitmap->mddev->bitmap_info.chunksize = chunksize;  in md_bitmap_read_sb()
706 		err = md_setup_cluster(bitmap->mddev, nodes);  in md_bitmap_read_sb()
712 		bitmap->cluster_slot = md_cluster_ops->slot_number(bitmap->mddev);  in md_bitmap_read_sb()
719 		bitmap->events_cleared = bitmap->mddev->events;  in md_bitmap_read_sb()
720 	bitmap->mddev->bitmap_info.chunksize = chunksize;  in md_bitmap_read_sb()
721 	bitmap->mddev->bitmap_info.daemon_sleep = daemon_sleep;  in md_bitmap_read_sb()
722 	bitmap->mddev->bitmap_info.max_write_behind = write_behind;  in md_bitmap_read_sb()
723 	bitmap->mddev->bitmap_info.nodes = nodes;  in md_bitmap_read_sb()
724 	if (bitmap->mddev->bitmap_info.space == 0 ||  in md_bitmap_read_sb()
725 	    bitmap->mddev->bitmap_info.space > sectors_reserved)  in md_bitmap_read_sb()
726 		bitmap->mddev->bitmap_info.space = sectors_reserved;  in md_bitmap_read_sb()
730 			md_cluster_stop(bitmap->mddev);  in md_bitmap_read_sb()
933 	if (mddev_is_clustered(bitmap->mddev))  in md_bitmap_file_set_bit()
962 	if (mddev_is_clustered(bitmap->mddev))  in md_bitmap_file_clear_bit()
1025 				if (bitmap->mddev->queue)  in md_bitmap_unplug()
1026 					blk_add_trace_msg(bitmap->mddev->queue,  in md_bitmap_unplug()
1069 	if (!file && !bitmap->mddev->bitmap_info.offset) {  in md_bitmap_init_from_disk()
1098 	if (!bitmap->mddev->bitmap_info.external)  in md_bitmap_init_from_disk()
1101 	if (mddev_is_clustered(bitmap->mddev))  in md_bitmap_init_from_disk()
1121 					bitmap->mddev,  in md_bitmap_init_from_disk()
1122 					bitmap->mddev->bitmap_info.offset,  in md_bitmap_init_from_disk()
1225 void md_bitmap_daemon_work(struct mddev *mddev)  in md_bitmap_daemon_work()  argument
1236 	mutex_lock(&mddev->bitmap_info.mutex);  in md_bitmap_daemon_work()
1237 	bitmap = mddev->bitmap;  in md_bitmap_daemon_work()
1239 		mutex_unlock(&mddev->bitmap_info.mutex);  in md_bitmap_daemon_work()
1243 			+ mddev->bitmap_info.daemon_sleep))  in md_bitmap_daemon_work()
1248 		mddev->thread->timeout = MAX_SCHEDULE_TIMEOUT;  in md_bitmap_daemon_work()
1253 	if (bitmap->mddev->queue)  in md_bitmap_daemon_work()
1254 		blk_add_trace_msg(bitmap->mddev->queue,  in md_bitmap_daemon_work()
1268 	    mddev->bitmap_info.external == 0) {  in md_bitmap_daemon_work()
1345 		mddev->thread->timeout =  in md_bitmap_daemon_work()
1346 			mddev->bitmap_info.daemon_sleep;  in md_bitmap_daemon_work()
1347 	mutex_unlock(&mddev->bitmap_info.mutex);  in md_bitmap_daemon_work()
1405 			 bw, bitmap->mddev->bitmap_info.max_write_behind);  in md_bitmap_startwrite()
1466 			 bitmap->mddev->bitmap_info.max_write_behind);  in md_bitmap_endwrite()
1481 		if (success && !bitmap->mddev->degraded &&  in md_bitmap_endwrite()
1482 		    bitmap->events_cleared < bitmap->mddev->events) {  in md_bitmap_endwrite()
1483 			bitmap->events_cleared = bitmap->mddev->events;  in md_bitmap_endwrite()
1602 	while (sector < bitmap->mddev->resync_max_sectors) {  in md_bitmap_close_sync()
1621 				  + bitmap->mddev->bitmap_info.daemon_sleep)))  in md_bitmap_cond_end_sync()
1623 	wait_event(bitmap->mddev->recovery_wait,  in md_bitmap_cond_end_sync()
1624 		   atomic_read(&bitmap->mddev->recovery_active) == 0);  in md_bitmap_cond_end_sync()
1626 	bitmap->mddev->curr_resync_completed = sector;  in md_bitmap_cond_end_sync()
1627 	set_bit(MD_SB_CHANGE_CLEAN, &bitmap->mddev->sb_flags);  in md_bitmap_cond_end_sync()
1630 	while (s < sector && s < bitmap->mddev->resync_max_sectors) {  in md_bitmap_cond_end_sync()
1635 	sysfs_notify_dirent_safe(bitmap->mddev->sysfs_completed);  in md_bitmap_cond_end_sync()
1639 void md_bitmap_sync_with_cluster(struct mddev *mddev,  in md_bitmap_sync_with_cluster()  argument
1643 	struct bitmap *bitmap = mddev->bitmap;  in md_bitmap_sync_with_cluster()
1695 		if (sec < bitmap->mddev->recovery_cp)  in md_bitmap_dirty_bits()
1700 			bitmap->mddev->recovery_cp = sec;  in md_bitmap_dirty_bits()
1707 void md_bitmap_flush(struct mddev *mddev)  in md_bitmap_flush()  argument
1709 	struct bitmap *bitmap = mddev->bitmap;  in md_bitmap_flush()
1718 	sleep = mddev->bitmap_info.daemon_sleep * 2;  in md_bitmap_flush()
1720 	md_bitmap_daemon_work(mddev);  in md_bitmap_flush()
1722 	md_bitmap_daemon_work(mddev);  in md_bitmap_flush()
1724 	md_bitmap_daemon_work(mddev);  in md_bitmap_flush()
1742 	if (mddev_is_clustered(bitmap->mddev) && bitmap->mddev->cluster_info &&  in md_bitmap_free()
1743 		bitmap->cluster_slot == md_cluster_ops->slot_number(bitmap->mddev))  in md_bitmap_free()
1744 		md_cluster_stop(bitmap->mddev);  in md_bitmap_free()
1767 void md_bitmap_wait_behind_writes(struct mddev *mddev)  in md_bitmap_wait_behind_writes()  argument
1769 	struct bitmap *bitmap = mddev->bitmap;  in md_bitmap_wait_behind_writes()
1774 			 mdname(mddev));  in md_bitmap_wait_behind_writes()
1781 void md_bitmap_destroy(struct mddev *mddev)  in md_bitmap_destroy()  argument
1783 	struct bitmap *bitmap = mddev->bitmap;  in md_bitmap_destroy()
1788 	md_bitmap_wait_behind_writes(mddev);  in md_bitmap_destroy()
1789 	if (!mddev->serialize_policy)  in md_bitmap_destroy()
1790 		mddev_destroy_serial_pool(mddev, NULL, true);  in md_bitmap_destroy()
1792 	mutex_lock(&mddev->bitmap_info.mutex);  in md_bitmap_destroy()
1793 	spin_lock(&mddev->lock);  in md_bitmap_destroy()
1794 	mddev->bitmap = NULL; /* disconnect from the md device */  in md_bitmap_destroy()
1795 	spin_unlock(&mddev->lock);  in md_bitmap_destroy()
1796 	mutex_unlock(&mddev->bitmap_info.mutex);  in md_bitmap_destroy()
1797 	if (mddev->thread)  in md_bitmap_destroy()
1798 		mddev->thread->timeout = MAX_SCHEDULE_TIMEOUT;  in md_bitmap_destroy()
1808 struct bitmap *md_bitmap_create(struct mddev *mddev, int slot)  in md_bitmap_create()  argument
1811 	sector_t blocks = mddev->resync_max_sectors;  in md_bitmap_create()
1812 	struct file *file = mddev->bitmap_info.file;  in md_bitmap_create()
1818 	BUG_ON(file && mddev->bitmap_info.offset);  in md_bitmap_create()
1820 	if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) {  in md_bitmap_create()
1822 			  mdname(mddev));  in md_bitmap_create()
1836 	bitmap->mddev = mddev;  in md_bitmap_create()
1839 	if (mddev->kobj.sd)  in md_bitmap_create()
1840 		bm = sysfs_get_dirent(mddev->kobj.sd, "bitmap");  in md_bitmap_create()
1857 	if (!mddev->bitmap_info.external) {  in md_bitmap_create()
1862 		if (test_and_clear_bit(MD_ARRAY_FIRST_USE, &mddev->flags))  in md_bitmap_create()
1868 		if (mddev->bitmap_info.chunksize == 0 ||  in md_bitmap_create()
1869 		    mddev->bitmap_info.daemon_sleep == 0)  in md_bitmap_create()
1878 	err = md_bitmap_resize(bitmap, blocks, mddev->bitmap_info.chunksize, 1);  in md_bitmap_create()
1895 int md_bitmap_load(struct mddev *mddev)  in md_bitmap_load()  argument
1900 	struct bitmap *bitmap = mddev->bitmap;  in md_bitmap_load()
1906 	rdev_for_each(rdev, mddev)  in md_bitmap_load()
1907 		mddev_create_serial_pool(mddev, rdev, true);  in md_bitmap_load()
1909 	if (mddev_is_clustered(mddev))  in md_bitmap_load()
1910 		md_cluster_ops->load_bitmaps(mddev, mddev->bitmap_info.nodes);  in md_bitmap_load()
1917 	while (sector < mddev->resync_max_sectors) {  in md_bitmap_load()
1924 	if (mddev->degraded == 0  in md_bitmap_load()
1925 	    || bitmap->events_cleared == mddev->events)  in md_bitmap_load()
1928 		start = mddev->recovery_cp;  in md_bitmap_load()
1930 	mutex_lock(&mddev->bitmap_info.mutex);  in md_bitmap_load()
1932 	mutex_unlock(&mddev->bitmap_info.mutex);  in md_bitmap_load()
1939 	set_bit(MD_RECOVERY_NEEDED, &bitmap->mddev->recovery);  in md_bitmap_load()
1941 	mddev->thread->timeout = mddev->bitmap_info.daemon_sleep;  in md_bitmap_load()
1942 	md_wakeup_thread(mddev->thread);  in md_bitmap_load()
1954 struct bitmap *get_bitmap_from_slot(struct mddev *mddev, int slot)  in get_bitmap_from_slot()  argument
1959 	bitmap = md_bitmap_create(mddev, slot);  in get_bitmap_from_slot()
1978 int md_bitmap_copy_from_slot(struct mddev *mddev, int slot,  in md_bitmap_copy_from_slot()  argument
1986 	bitmap = get_bitmap_from_slot(mddev, slot);  in md_bitmap_copy_from_slot()
2000 			md_bitmap_set_memory_bits(mddev->bitmap, block, 1);  in md_bitmap_copy_from_slot()
2001 			md_bitmap_file_set_bit(mddev->bitmap, block);  in md_bitmap_copy_from_slot()
2014 	md_bitmap_unplug(mddev->bitmap);  in md_bitmap_copy_from_slot()
2034 	chunk_kb = bitmap->mddev->bitmap_info.chunksize >> 10;  in md_bitmap_status()
2041 		   chunk_kb ? chunk_kb : bitmap->mddev->bitmap_info.chunksize,  in md_bitmap_status()
2084 		long space = bitmap->mddev->bitmap_info.space;  in md_bitmap_resize()
2091 			if (!bitmap->mddev->bitmap_info.external)  in md_bitmap_resize()
2094 			bitmap->mddev->bitmap_info.space = space;  in md_bitmap_resize()
2103 			if (!bitmap->mddev->bitmap_info.external)  in md_bitmap_resize()
2111 	if (bitmap->mddev->bitmap_info.offset || bitmap->mddev->bitmap_info.file)  in md_bitmap_resize()
2113 					      !bitmap->mddev->bitmap_info.external,  in md_bitmap_resize()
2114 					      mddev_is_clustered(bitmap->mddev)  in md_bitmap_resize()
2131 		bitmap->mddev->pers->quiesce(bitmap->mddev, 1);  in md_bitmap_resize()
2150 	bitmap->mddev->bitmap_info.chunksize = 1 << (chunkshift +  in md_bitmap_resize()
2157 	if (mddev_is_clustered(bitmap->mddev)) {  in md_bitmap_resize()
2176 				bitmap->mddev->bitmap_info.chunksize = 1 << (old_counts.chunkshift +  in md_bitmap_resize()
2247 		bitmap->mddev->pers->quiesce(bitmap->mddev, 0);  in md_bitmap_resize()
2256 location_show(struct mddev *mddev, char *page)  in location_show()  argument
2259 	if (mddev->bitmap_info.file)  in location_show()
2261 	else if (mddev->bitmap_info.offset)  in location_show()
2262 		len = sprintf(page, "%+lld", (long long)mddev->bitmap_info.offset);  in location_show()
2270 location_store(struct mddev *mddev, const char *buf, size_t len)  in location_store()  argument
2274 	rv = mddev_lock(mddev);  in location_store()
2277 	if (mddev->pers) {  in location_store()
2278 		if (!mddev->pers->quiesce) {  in location_store()
2282 		if (mddev->recovery || mddev->sync_thread) {  in location_store()
2288 	if (mddev->bitmap || mddev->bitmap_info.file ||  in location_store()
2289 	    mddev->bitmap_info.offset) {  in location_store()
2295 		if (mddev->pers) {  in location_store()
2296 			mddev_suspend(mddev);  in location_store()
2297 			md_bitmap_destroy(mddev);  in location_store()
2298 			mddev_resume(mddev);  in location_store()
2300 		mddev->bitmap_info.offset = 0;  in location_store()
2301 		if (mddev->bitmap_info.file) {  in location_store()
2302 			struct file *f = mddev->bitmap_info.file;  in location_store()
2303 			mddev->bitmap_info.file = NULL;  in location_store()
2326 			if (mddev->bitmap_info.external == 0 &&  in location_store()
2327 			    mddev->major_version == 0 &&  in location_store()
2328 			    offset != mddev->bitmap_info.default_offset) {  in location_store()
2332 			mddev->bitmap_info.offset = offset;  in location_store()
2333 			if (mddev->pers) {  in location_store()
2335 				bitmap = md_bitmap_create(mddev, -1);  in location_store()
2336 				mddev_suspend(mddev);  in location_store()
2340 					mddev->bitmap = bitmap;  in location_store()
2341 					rv = md_bitmap_load(mddev);  in location_store()
2343 						mddev->bitmap_info.offset = 0;  in location_store()
2346 					md_bitmap_destroy(mddev);  in location_store()
2347 					mddev_resume(mddev);  in location_store()
2350 				mddev_resume(mddev);  in location_store()
2354 	if (!mddev->external) {  in location_store()
2358 		set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);  in location_store()
2359 		md_wakeup_thread(mddev->thread);  in location_store()
2363 	mddev_unlock(mddev);  in location_store()
2377 space_show(struct mddev *mddev, char *page)  in space_show()  argument
2379 	return sprintf(page, "%lu\n", mddev->bitmap_info.space);  in space_show()
2383 space_store(struct mddev *mddev, const char *buf, size_t len)  in space_store()  argument
2395 	if (mddev->bitmap &&  in space_store()
2396 	    sectors < (mddev->bitmap->storage.bytes + 511) >> 9)  in space_store()
2402 	mddev->bitmap_info.space = sectors;  in space_store()
2410 timeout_show(struct mddev *mddev, char *page)  in timeout_show()  argument
2413 	unsigned long secs = mddev->bitmap_info.daemon_sleep / HZ;  in timeout_show()
2414 	unsigned long jifs = mddev->bitmap_info.daemon_sleep % HZ;  in timeout_show()
2424 timeout_store(struct mddev *mddev, const char *buf, size_t len)  in timeout_store()  argument
2442 	mddev->bitmap_info.daemon_sleep = timeout;  in timeout_store()
2443 	if (mddev->thread) {  in timeout_store()
2448 		if (mddev->thread->timeout < MAX_SCHEDULE_TIMEOUT) {  in timeout_store()
2449 			mddev->thread->timeout = timeout;  in timeout_store()
2450 			md_wakeup_thread(mddev->thread);  in timeout_store()
2460 backlog_show(struct mddev *mddev, char *page)  in backlog_show()  argument
2462 	return sprintf(page, "%lu\n", mddev->bitmap_info.max_write_behind);  in backlog_show()
2466 backlog_store(struct mddev *mddev, const char *buf, size_t len)  in backlog_store()  argument
2469 	unsigned long old_mwb = mddev->bitmap_info.max_write_behind;  in backlog_store()
2475 	mddev->bitmap_info.max_write_behind = backlog;  in backlog_store()
2476 	if (!backlog && mddev->serial_info_pool) {  in backlog_store()
2478 		if (!mddev->serialize_policy)  in backlog_store()
2479 			mddev_destroy_serial_pool(mddev, NULL, false);  in backlog_store()
2480 	} else if (backlog && !mddev->serial_info_pool) {  in backlog_store()
2484 		rdev_for_each(rdev, mddev)  in backlog_store()
2485 			mddev_create_serial_pool(mddev, rdev, false);  in backlog_store()
2488 		md_bitmap_update_sb(mddev->bitmap);  in backlog_store()
2496 chunksize_show(struct mddev *mddev, char *page)  in chunksize_show()  argument
2498 	return sprintf(page, "%lu\n", mddev->bitmap_info.chunksize);  in chunksize_show()
2502 chunksize_store(struct mddev *mddev, const char *buf, size_t len)  in chunksize_store()  argument
2507 	if (mddev->bitmap)  in chunksize_store()
2515 	mddev->bitmap_info.chunksize = csize;  in chunksize_store()
2522 static ssize_t metadata_show(struct mddev *mddev, char *page)  in metadata_show()  argument
2524 	if (mddev_is_clustered(mddev))  in metadata_show()
2526 	return sprintf(page, "%s\n", (mddev->bitmap_info.external  in metadata_show()
2530 static ssize_t metadata_store(struct mddev *mddev, const char *buf, size_t len)  in metadata_store()  argument
2532 	if (mddev->bitmap ||  in metadata_store()
2533 	    mddev->bitmap_info.file ||  in metadata_store()
2534 	    mddev->bitmap_info.offset)  in metadata_store()
2537 		mddev->bitmap_info.external = 1;  in metadata_store()
2540 		mddev->bitmap_info.external = 0;  in metadata_store()
2549 static ssize_t can_clear_show(struct mddev *mddev, char *page)  in can_clear_show()  argument
2552 	spin_lock(&mddev->lock);  in can_clear_show()
2553 	if (mddev->bitmap)  in can_clear_show()
2554 		len = sprintf(page, "%s\n", (mddev->bitmap->need_sync ?  in can_clear_show()
2558 	spin_unlock(&mddev->lock);  in can_clear_show()
2562 static ssize_t can_clear_store(struct mddev *mddev, const char *buf, size_t len)  in can_clear_store()  argument
2564 	if (mddev->bitmap == NULL)  in can_clear_store()
2567 		mddev->bitmap->need_sync = 1;  in can_clear_store()
2569 		if (mddev->degraded)  in can_clear_store()
2571 		mddev->bitmap->need_sync = 0;  in can_clear_store()
2581 behind_writes_used_show(struct mddev *mddev, char *page)  in behind_writes_used_show()  argument
2584 	spin_lock(&mddev->lock);  in behind_writes_used_show()
2585 	if (mddev->bitmap == NULL)  in behind_writes_used_show()
2589 			      mddev->bitmap->behind_writes_used);  in behind_writes_used_show()
2590 	spin_unlock(&mddev->lock);  in behind_writes_used_show()
2595 behind_writes_used_reset(struct mddev *mddev, const char *buf, size_t len)  in behind_writes_used_reset()  argument
2597 	if (mddev->bitmap)  in behind_writes_used_reset()
2598 		mddev->bitmap->behind_writes_used = 0;  in behind_writes_used_reset()