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SubjectRe: [klibc] Exporting which partitions to md-configure
On Mon, Jan 30, 2006 at 07:21:33PM -0800, Greg KH wrote:
> On Mon, Jan 30, 2006 at 04:52:08PM -0800, H. Peter Anvin wrote:
> > I'm putting the final touches on kinit, which is the user-space
> > replacement (based on klibc) for the whole in-kernel root-mount complex.
> > Pretty much the one thing remaining -- other than lots of testing --
> > is to handle automatically mounted md devices. In order to do that,
> > without adding userspace versions of all the paritition code (which may
> > be a future change, but a pretty big one) it would be good if the
> > partition flag to auto-configure RAID was available in userspace,
> > presumably through sysfs.
>
> What are you looking for exactly? udev has a great helper program,
> volume_id, that identifies any type of filesystem that Linux knows about
> (it was based on the ext2 lib code, but smaller, and much more sane, and
> works better.)
>
> Would that help out here?

Oh, an example of it working:
# vol_id /dev/sda3
ID_FS_USAGE=filesystem
ID_FS_TYPE=ext3
ID_FS_VERSION=1.0
ID_FS_UUID=9d2efd53-6b5a-4f84-86cc-def71269b7ca
ID_FS_LABEL=
ID_FS_LABEL_SAFE=
# vol_id -t /dev/sda3
ext3
# vol_id -u /dev/sda3
9d2efd53-6b5a-4f84-86cc-def71269b7ca

It also shows just the label if you have one set (I don't on this
disk...)

thanks,

greg k-h
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