linux-ext4 - Re: [PATCH 1/4] vfs: vfs-level fiemap interface

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Message-ID: <20080920153633.GA6061@shareable.org>
Date:	Sat, 20 Sep 2008 16:36:34 +0100
From:	Jamie Lokier <jamie@...reable.org>
To:	Chris Mason <chris.mason@...cle.com>
Cc:	Jörn Engel <joern@...fs.org>,
	Theodore Tso <tytso@....edu>, Andreas Dilger <adilger@....com>,
	Christoph Hellwig <hch@...radead.org>,
	linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
	akpm@...uxfoundation.org, Mark Fasheh <mfasheh@...e.com>,
	mtk.manpages@...il.com
Subject: Re: [PATCH 1/4] vfs: vfs-level fiemap interface

Chris Mason wrote:
> > > > For the journal case at least, grub can walk through the log of the FS
> > > > looking for up to date copies of things.  It does this already for
> > > > reiserfs because the btree can't be trusted at all without a log replay.
> > OMFG.
> 
> Shrug, either we force the user to do something to get the blocks on
> disk in a stable location or we have a bootloader that can parse the
> disk format.  It's either pain on the developers (patching grub) or pain
> on every user, and the support people who have to remind them to rerun
> grub-find-the-disk-blocks-just-like-lilo

I think this thread may be confusing /usr/bin/grub with grub the bootloader.

One of the useful features of grub the bootloader is that it can boot
from a real filesystem without needing "run lilo before it's safe to
boot - or you'll regret shutting down".

That feature needs to use some kind of bleeding-eyes filesystem code,
or it will be as large as the filesystem code in Linux.

On the other hand, any dodgy direct access done by /usr/bin/grub has
no justification and is fair game for deletion, imho.

-- Jamie
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