linux-kernel - Re: msync(2) bug(?), returns AOP_WRITEPAGE

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Message-ID: <84144f020710080418r37639efcx495bdb199f7540c2@mail.gmail.com>
Date:	Mon, 8 Oct 2007 14:18:39 +0300
From:	"Pekka Enberg" <penberg@...helsinki.fi>
To:	"Ryan Finnie" <ryan@...nie.org>
Cc:	"Erez Zadok" <ezk@...sunysb.edu>, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, "Colin Watson" <cjwatson@...ntu.com>
Subject: Re: msync(2) bug(?), returns AOP_WRITEPAGE_ACTIVATE to userland

Hi Ryan,

On 10/8/07, Ryan Finnie <ryan@...nie.org> wrote:
> Doesn't appear to be enough.  I can't figure out why (since it appears
> write_cache_pages bubbles up directly to sys_msync), but with that
> patch applied, in my test case[1], msync returns -1 EIO.  However,
> with the exact same kernel without that patch applied, msync returns
> 524288 (AOP_WRITEPAGE_ACTIVATE).  But as your patch specifically flips
> 524288 to 0, I can't figure out how it eventually returns  -1 EIO.
>
> [1] "apt-get check" on a unionfs2 mount backed by tmpfs over cdrom,
> standard livecd setup

You have swap device disabled, right? If so, I can't see any reason
why msync(2) on tmpfs would return -EIO. Can you please send a strace
log for your test case?

                                       Pekka
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