bdev_thaw
EXPORT_SYMBOL(bdev_thaw);
bdev_thaw(md->disk->part0);
bdev_thaw(sb->s_bdev);
bdev_thaw(sb->s_bdev);
bdev_thaw(sb->s_bdev);
bdev_thaw(sb->s_bdev);
while (sb->s_bdev && !bdev_thaw(sb->s_bdev))
bdev_thaw(mp->m_super->s_bdev);
int bdev_thaw(struct block_device *bdev);