fs/affs: return f_fsid for statfs(2)

Make affs return f_fsid info for statfs(2).
Signed-off-by: NColy Li <coly.li@suse.de>
Cc: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

fs/affs/super.c

@@ -533,6 +533,7 @@ affs_statfs(struct dentry *dentry, struct kstatfs *buf)
 {
 	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);
@@ -543,6 +544,9 @@ affs_statfs(struct dentry *dentry, struct kstatfs *buf)
 	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;
 }