md/bitmap: make sure reshape request are reflected in superblock.
As a reshape may change the sync_size and/or chunk_size, we need
to update these whenever we write out the bitmap superblock.
Signed-off-by: NeilBrown <neilb@suse.de>
diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c
index a35561f..8f681da 100644
--- a/drivers/md/bitmap.c
+++ b/drivers/md/bitmap.c
@@ -420,6 +420,9 @@
/* Just in case these have been changed via sysfs: */
sb->daemon_sleep = cpu_to_le32(bitmap->mddev->bitmap_info.daemon_sleep/HZ);
sb->write_behind = cpu_to_le32(bitmap->mddev->bitmap_info.max_write_behind);
+ /* This might have been changed by a reshape */
+ sb->sync_size = cpu_to_le64(bitmap->mddev->resync_max_sectors);
+ sb->chunksize = cpu_to_le32(bitmap->mddev->bitmap_info.chunksize);
kunmap_atomic(sb);
write_page(bitmap, bitmap->storage.sb_page, 1);
}