Extending zfsboot.c to allow selecting filesystem from boot.config

[Florian Wagner]

On Sat, 26 Nov 2011 13:39:37 +0200
Andriy Gapon <avg at FreeBSD.org> wrote:

> on 25/11/2011 23:47 Florian Wagner said the following:
> > No more memory corruptions with the patch, but booting now stops
> > with "ZFS: zfs_alloc()/zfs_free() mismatch".
> 
> This happens only with real boot, not with zfsboottest?

Yes, zfsboottest works without issues.


> > If I comment out lines 145-148 in the zfsboottest.c you linked, I
> > can successfully read files from the pool by doing ./zfsboottest
> > <FILENAME>
> 
> Ah, right, those lines were left there by mistake during merge.
> 
> > <LIST-OF-VDEVS>. This also works correctly when omitting up to two
> > vdevs of my RAID-Z2 pool:
> > 
> >   # ./zfsboottest /boot/zfsloader /dev/da{0,1,2}p2 2>/dev/null | md5
> >   336c56a04c8d6d432df999b35ce459f7
> >   # md5 /boot/zfsloader
> >   MD5 (/boot/zfsloader) = 336c56a04c8d6d432df999b35ce459f7
> > 
> > 
> > After applying the patch from [1] (the thread references the same
> > output I get, even if the conclusion doesn't fit) I can sometimes
> > boot my VM. This seems to correlate with how much is written to the
> > pool. Quickly rebooting after the system comes up works, but
> > waiting a few minutes always results in getting the mismatch error
> > on the reboot. After that only booting with unpatched gptzfsboot
> > works (whereafter the patched one works again for one reboot or so).
> 
> Oh, strangeness...

Yeah.

I'll try applying your patches to head instead of stable/8 in the next
days and test that. To make matters easier, can you tell me which
revision of head they are based on?


Regards
Florian
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