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Date:	Thu, 3 Jan 2013 13:19:29 -0500
From:	Christoph Hellwig <hch@...radead.org>
To:	Sergei Trofimovich <slyfox@...too.org>
Cc:	xfs@....sgi.com, Alex Elder <elder@...nel.org>,
	Dave Chinner <dchinner@...hat.com>,
	linux-kernel@...r.kernel.org, Ben Myers <bpm@....com>,
	Phil White <pwhite@....com>
Subject: Re: [PATCH] xfs: return -EINVAL instead of -EUCLEAN when mounting
 non-xfs

On Sun, Dec 30, 2012 at 02:16:50AM +0300, Sergei Trofimovich wrote:
> It fixes boot panic when trying to boot from btrfs filesystem.
> kernel tries to mount as xfs and gets fatal -EUCLEAN:
> 
> [    0.170000] VFS: Cannot open root device "ubda" or unknown-block(98,0): error -117
> [    0.170000] Please append a correct "root=" boot option; here are the available partitions:
> [    0.170000] 6200         1048576 ubda  driver: uml-blkdev
> [    0.170000] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(98,0)
> 
> init/do_mounts.c expects only -EINVAL as 'retry another' option.
> Fixes regression introduced by commit 98021821a502db347bd9c7671beeee6e8ce07ea6

Looks reasonable, but  think xfs_readsb should simply be changed to
turn all EFSCORRUPTED returns into EINVAL if loud is not set.  The
place that changes the errno value would also be a perfect place to
comment why we are doing this in the code so that this knowledge doesn't
get lost.

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