usesuper::*;/// Mounts an ext4 filesystem from the given block device.
pubfnfs_mount<B: BlockDevice>(dev:&mutJbd2Dev<B>)->Ext4Result<Ext4FileSystem>{ext4::mount(dev)}/// Unmounts a previously mounted ext4 filesystem.
pubfnfs_umount<B: BlockDevice>(fs: Ext4FileSystem, dev:&mutJbd2Dev<B>)->Ext4Result<()>{ext4::umount(fs, dev)}