GEOM and moving to CURRENT from 7.1

[Dimitry Andric]

On 2009-01-15 20:55, Marcel Moolenaar wrote:
> Thanks *very* much for testing! It's important that we
> get the details right, so that we can consider adding
> code to help in the migration and fix whatever is broken.

In sysinstall, a standard installation writes the disks like so:

usr.sbin/sysinstall/install.c:  installStandard()
usr.sbin/sysinstall/install.c:  installCommit()
usr.sbin/sysinstall/install.c:  installInitial()
usr.sbin/sysinstall/label.c:    diskLabelCommit()
usr.sbin/sysinstall/disks.c:    diskPartitionWrite()
lib/libdisk/write_i386_disk.c:  Write_Disk()

It looks like Write_Disk() always writes a partition table:

int
Write_Disk(const struct disk *d1)
{
[...]
	struct dos_partition *dp,work[NDOSPART];

[...]
	for (c1 = d1->chunks->part; c1; c1 = c1->next) {
[... fills dp here ...]
	}

[...]
	memcpy(mbrblk + DOSPARTOFF, dp, sizeof *dp * NDOSPART);
	mbrblk[512-2] = 0x55;
	mbrblk[512-1] = 0xaa;
	write_block(fd, 0, mbrblk, d1->sector_size);
[...]