On Fri, 2020-04-17 at 15:03 -0700, Samuel Sieb wrote:
> On 4/17/20 2:42 PM, Patrick O'Callaghan wrote:
> > On Fri, 2020-04-17 at 14:25 -0700, Samuel Sieb wrote:
> > > On 4/17/20 2:11 PM, Roger Heflin wrote:
> > > > For the vg/offset to work the file must be contiguous (only 1
> > > > section/extent in the file).   I don't see that mentioned in
> > > > archlinux.
> > > 
> > > I tried to find out the on-disk format for swap files, but wasn't able
> > > to.  But from the doc at
> > > https://www.kernel.org/doc/html/latest/power/swsusp-and-swap-files.html
> > 
> > That does give some interesting insights. In particular, it explains
> > why the file has to be treated specially (because during resume, the
> > filesystem may not be mounted, which is what I was trying to get at
> > earlier). This clears up some confusion for me at least.
> 
> During resume, the filesystem *can't* be mounted.  All the filesystem 
> state is in the hibernation image which you are trying to load.  It's 
> one of those fun chicken and egg challenges.  That's why there has to be 
> enough info in the swap file to locate the data without relying on 
> anything else.

Yes, that's exactly my point. However it does mean that the filesystem
has to be one that the initial system understands.

poc
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