I no longer have easy access to a system with CMS disks either, but I do
remember that Rick Troth wrote cmsfs for Linux in the first place and I
think his tool set included a couple of CMS disk images to test
against. That might be helpful--although since none of them were images
of CMS RESERVED disks maybe not.
I think that CMS disks can have a different logical block size than the
underlying DASD, but I also suspect that case is vary rare. At any
rate, the logical block size is in the CMS volume label, and might need
to be scaled according to what the disk says to make parted happy.
DIAG250 cares about the CMS block size; directly talking to the disk
with CCWs doesn't. I think. It's been a while since I had to know this.
Anyway, if the patch didn't break anything for existing users it's
definitely an improvement.
Adam
Jonathan Nieder wrote:
Hi,
The inimitable Stephen Powell sent something like the two patches
below to <http://bugs.debian.org/578097>. It seems that they teach
the dasd driver in parted to handle CMS-labeled partitions, which are
a little more flexible and probably more common than the LDL format
libparted already supports.
Unfortunately, I do not have a specimen to experiment with, so I
cannot say if my whitespace tweaks and so on broke the patch.
Stephen, would it be possible to put up an image of a tiny partition
to try this out with?
The support is for reading only because that is what is most needed.
I don’t imagine there would be any major technical obstacles to
teaching parted to write these partitions, too.
Thoughts?
Jonathan
Stephen Powell (2):
dasd: take sector size into account when calculating starting block
dasd: add read-only support for CMS labeled minidisks
NEWS | 7 +++++++
include/parted/vtoc.h | 43 +++++++++++++++++++++++++++++++++++++++++++
libparted/labels/dasd.c | 24 ++++++++++++++++++++----
libparted/labels/fdasd.c | 15 ++++++++-------
4 files changed, 78 insertions(+), 11 deletions(-)
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