fs/affs: return f_fsid for statfs(2)

Make affs return f_fsid info for statfs(2).

Signed-off-by: Coly Li <[e-mail]>
Cc: Roman Zippel <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

fs/affs/super.c

···
 {
 	struct super_block *sb = dentry->d_sb;
 	int		 free;
+	u64		 id = huge_encode_dev(sb->s_bdev->bd_dev);
 
 	pr_debug("AFFS: statfs() partsize=%d, reserved=%d\n",AFFS_SB(sb)->s_partition_size,
 	     AFFS_SB(sb)->s_reserved);
···
 	buf->f_blocks  = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved;
 	buf->f_bfree   = free;
 	buf->f_bavail  = free;
+	buf->f_fsid.val[0] = (u32)id;
+	buf->f_fsid.val[1] = (u32)(id >> 32);
+	buf->f_namelen = 30;
 	return 0;
 }