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Re: grub-probe detects ext4 wronly as ext2

From: Bean
Subject: Re: grub-probe detects ext4 wronly as ext2
Date: Mon, 30 Jun 2008 20:27:50 +0800

On Mon, Jun 30, 2008 at 8:12 PM, Javier Martín <address@hidden> wrote:
> El lun, 30-06-2008 a las 07:14 -0400, Isaac Dupree escribió:
>> > +#define EXT3_FEATURE_INCOMPAT_RECOVER              0x0004 /* Needs 
>> > recovery */
>> I suspect this will mean that journalled ext3 when the system crashed
>> (so the filesystem "needs recovery" from the journal) won't load.  (Of
>> course, properly speaking that would load grub's code to replay the
>> journal...)  But I think that (without other changes) that would make
>> the system unbootable every time there was a power outage?  (Of course
>> it was not guaranteed to load correctly when ignoring the journal when
>> it needed recovery, but it was likely to work, IIUC.)
>> -Isaac
> As I said, I didn't add it because I didn't know whether recovery was
> supported or not. _Theoretically_ we should focus on correctness and
> refuse to read such a filesystem, but here goes a workaround for
> incompatible features that we do not support but still willingly want to
> ignore for the sake of "compatibility". This new version of the patch
> adds another macro, EXT2_DRIVER_IGNORED_INCOMPAT where we can put
> features that we don't fully support, but still want a filesystem with
> them to be mounted, like the needs_recover flag.
> Of course, this is risky: INCOMPAT_* features are so for a reason, but
> it will allow dirty ext3 filesystems to be mounted until we have a
> working journal implementation. I had thought of adding some kind of
> warning, but since GRUB mounts and umounts filesystems constantly, it
> just cluttered the screen and I removed it.


We must not quit if the journal flag is set, even if we don't handle
it. grub-setup runs in a active system, the journal wouldn't be empty.
If we just quit, we can't even install.


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