From owner-freebsd-libh  Mon Oct  8 21:39:28 2001
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Date: Tue, 9 Oct 2001 00:40:01 -0400
From: The Anarcat <anarcat@anarcat.dyndns.org>
To: Libh <freebsd-libh@freebsd.org>
Subject: adding Disk::freespace to lib[h]disk
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Hi.

I'm now placed in front of a design decision, i think. :)

Either I hack Disk to make a freespace() routine there or make it part
of diskedit.

Of course I think it should belong to Disk, but it's not so obvious.
First, all the calculations can be done in TCL, from what I understand.

Second, this should be available in libdisk. :)

Indeed, the algorithm is shamefully simple (again stolen form
sysinstall):

static int
space_free(struct chunk *c)
{
    struct chunk *c1;
    int sz =3D c->size;

    for (c1 =3D c->part; c1; c1 =3D c1->next) {
	if (c1->type !=3D unused)
	    sz -=3D c1->size;
    }
    if (sz < 0)
	msgFatal("Partitions are larger than actual chunk??");
    return sz;
}

Integrating this into libdisk should be easy (?).

Another thought about "freespace": freespace is not a magical pool of
bytes. It's made of *chunks* of unused partitions. And to make things
worse, there are 2 different "layers" of freespace: the slice (dos vs
fbsd) and partition (inside fbsd parts) layers.

I will therefore make 2 different "labels" or kind of displays about
this.=20

Ideally, I'll be able to make a nice colored bar of the sections of the
disk used [uh yes... drool, drool... :)]

For now, I'll just stick to freespace() and a simple text-like GUI
display. :)

A.

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