On Fri, 2005-03-11 at 19:04 -0500, Jeff Kinz wrote:
> On Fri, Mar 11, 2005 at 09:05:43PM +0000, Paul Howarth wrote:
> > On Fri, 2005-03-11 at 15:07 -0500, Jeff Kinz wrote:
> > > On Fri, Mar 11, 2005 at 10:02:05PM +0200, Pasha R wrote:
> > > > It appears that mkswap does have a -L option, though undocumented in man
> > > > page. Using it fixed my problem.
> > > >
> > > > BTW, how do you set label in fdisk? I tried that, but could not find an
> > > > appropriate option.
> > >
> > > from the "m" command ("m" for "help" :-) )
> > > "t" change a partition's system id
> > >
> > > The type for linux swap is "82"
> >
> > That's setting the partition type in the partition table, which is not
> > the same as the filesystem label, which lives "inside" the filesystem on
> > each partition.
>
> <Hesitantly>
> ummm - but a swap partition has no "filesystem" per se. Just a chunk of
> addressable bytes, nicht?
>
> I have to assume that Pasha is talking about the partition type ID
> since you (might, probably?) have to know what the type of filesystem,
> if any, a partition contains, before you can "read it" to retrieve any
> label?
>
> </Hesitantly>
If you look at the bugzilla entry I referenced earlier in the thread,
there's a description there of the "swap header":
> Here's what the swap header looks like:
>
> At offset 0, the structure:
> struct swap_header_v1_1 {
> char uuid[16];
> char volume_name[16];
> char bootbits[1024-32]; /* Space for disklabel */
> unsigned int version;
> unsigned int last_page;
> unsigned int nr_badpages;
> unsigned int padding[125];
> unsigned int badpages[1];
> };
>
> At offset getpagesize()-10, the characters "SWAPSPACE2".
>
> mkswap will have a -L label, and swapon will start accepting UUID= and
> LABEL=, and that should about be it.
So the "bootbits" field of the header is being used as the label.
Perhaps not a regular filesystem, but able to be labelled anyway.
Paul.
--
Paul Howarth <paul@xxxxxxxxxxxx>
