linux-kernel - Re: [PATCH 1/1] hostfs: fix UML crash

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Message-ID: <20101019011125.GA3905@lst.de>
Date:	Tue, 19 Oct 2010 03:11:25 +0200
From:	Christoph Hellwig <hch@....de>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Richard Weinberger <richard@....at>, linux-kernel@...r.kernel.org,
	jdike@...toit.com, user-mode-linux-devel@...ts.sourceforge.net,
	viro@...iv.linux.org.uk, toralf.foerster@....de,
	Christoph Hellwig <hch@....de>, Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH 1/1] hostfs: fix UML crash

On Mon, Oct 18, 2010 at 01:02:08PM -0700, Andrew Morton wrote:
> > > 
> > > Is there any reason for hostfs to be playing with the f_spare field at all?

No, there is no reason at all.  do_statfs is only called by
hostfs_statfs, which is the hostfs implementation of ->statfs.  zeroing
of the spare fields is done by common code (vfs_statfs_native).

Can you submit a patch to just remove the spare_out argument to do_statfs?

> 365b1818 added f_flags to `struct statfs' but didn't carry that over to
> `struct compat_statfs' and hence didn't copy f_flags over into
> compat_statfs.  Deliberate, or oversight?

Oversight.
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