F9 (bug?) Superblock features different from backup

[Ahmed Kamal]

Just out of curiosity, could you let me know what kind of changes the kernel
makes to the superblock without asking first! That sounds interesting

On Sun, May 11, 2008 at 12:59 AM, Eric Sandeen <sandeen at redhat.com> wrote:

> Ahmed Kamal wrote:
> > Hi,
> > Just installed F9 preview and updated to latest. Rebooted everything was
> > fine. Today, I booted the system again, played with it for a few hours,
> > then I rebooted to test the "i915.modeset" (which is hyper cool thanks:)
> > Now when the machine came up, I got:
> > Primary superblock features different from backup: Check forced
> > This was on the root filesystem. It checked the FS, and finally said "**
> > Rebooting Linux **", at this stage I was fairly scared .. it looked like
> > a serious problem!
> > However, Fedora rebooted and it came up just fine!
> >
> > Well, I have no idea what just happened
>
> It should be fine.
>
> Most recent e2fsprogs enforces that feature flags in backups match those
> on the primary.
>
> Problem is, the kernel sets things on the fly, but does not update the
> backups.  This is ... annoying... because then it causes the full fsck.
>
> I'm a little surprised that it did check though, because for now I have
> F9 carrying a patch to actually *disable* this test, because otherwise
> any F8->F9 upgrade would cause a full fsck just for this reason, which I
> think is overly aggressive.
>
> But, anyway, you should be fine now, and it shouldn't happen again.  :)
>
> -Eric
>
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