Re: disk devices vs. wedges and wrong FS type

["John D. Baker" <jdbaker%mylinuxisp.com@localhost>]

On Thu, 22 Jan 2015 19:25:54 +0000 (UTC), christos%astron.com@localhost
(Christos Zoulas) wrote:

> Perhaps there is a check that the type of the device is swap...

On Thu, 22 Jan 2015, John D. Baker wrote:

> The only problem that remains is that I cannot seem to configure the
> swap partition:
> 
> $ pdisk -l /dev/rwd0c
> 
> Partition map (with 512 byte blocks) on '/dev/rwd0c'
>  #:                type name      length   base      ( size )
[...]
>  4:     Apple_UNIX_SVR2 Swap     4195296 @ 20993617  (  2.0G) S1  SFS k0  (swap)
[...]

The "bzb flags" (as they are called in the partitioning HOWTO referenced
in the macppc INSTALL document) says this partition is the swap partition.

'disklabel' agrees with this:

$ disklabel wd0
[...]
7 partitions:
#        size    offset     fstype [fsize bsize cpg/sgs]
 a:  20972448     21169     4.2BSD      0     0     0  # (Cyl.     21*-  20827*)
 b:   4195296  20993617       swap                     # (Cyl.  20827*-  24989*)
 c: 156301488         0     unused      0     0        # (Cyl.      0 - 155060)
 d:     21105        64        HFS                     # (Cyl.      0*-     21*)
 e:   8389584  27286561     4.2BSD      0     0     0  # (Cyl.  27070*-  35393*)
 f: 120625343  35676145     4.2BSD      0     0     0  # (Cyl.  35393*- 155060)
 g:   2097648  25188913     4.2BSD      0     0     0  # (Cyl.  24989*-  27070*)
disklabel: boot block size 0
disklabel: super block size 0

It seems the DKWEDGE_AUTODISCOVER code for parsing Apple Partition Map
doesn't look at the flags, but only the type:

> dk2 at wd0: Swap
> dk2: 4195296 blocks at 20993617, type: sysv
> [...]

I can fill "/dev/rdk2" with data ('dd' from /dev/zero) and read it back,
so obviously the device IS configured.  I just can't tell the machine to
use it as swap--'swapctl' claims "/dev/dk2: Device not configured".

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