linux-ext4 - Re: [PATCH] Make some ext3 kernel messages useful by showing device

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Date:	Mon, 09 Jun 2008 16:08:02 -0600
From:	Andreas Dilger <adilger@....com>
To:	Eric Sandeen <esandeen@...hat.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, lkml@...anurb.dk,
	linux-kernel@...r.kernel.org, linux-ext4@...r.kernel.org
Subject: Re: [PATCH] Make some ext3 kernel messages useful by showing device

Eric Sandeen <sandeen@...hat.com> wrote:
> The patch itself looks fine to me, and is a good idea.  I recently saw a
> confused user on another fs where successful mount messages were
> followed by failure mount messages with no indication of which fs had
> the trouble...
> 
> There probably are more spots in extX which could use this treatment...
> should we maybe just be using ext3_warning in more places, which
> automatically prints the sb, function name, etc?

Most of the messages in ext[234]_fill_super() should really be ext3_error(),
but because the superblock isn't properly set up calling ext3_error() is a
way to oops the kernel.

Probably the cleanest solution is to split ext3_error() into a helper function
ext3_error_msg() that can be called from ext3_fill_super(), and the rest
of the code that now lives in ext3_handle_error().

Alternately, a flag could be set in the superblock ("EXT3_SETUP_DONE")
once everything is initialized, and then ext3_error() calls
ext3_handle_error(), and otherwise just prints the message and the
mount will fail by itself.  This has the benefit that we can use
ext3_error() everywhere there is a fatal problem, but the drawback that
it may become confusing due to the added "errors=*" semantics that will
not behave as they do in other functions.

Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.

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