Date: Thu, 16 Sep 2004 00:08:19 +0200
From: Andrea Arcangeli <andrea@novell.com>
To: William Lee Irwin III <wli@holomorphy.com>
Cc: Andrew Morton <akpm@osdl.org>, linux-kernel@vger.kernel.org,
       an.li.wang@intel.com
Subject: Re: truncate shows non zero data beyond the end of the inode with MAP_SHARED
Message-ID: <20040915220819.GF15426@dualathlon.random>
References: <20040915122920.GA4454@dualathlon.random> <20040915210106.GX9106@holomorphy.com> <20040915145524.079a8694.akpm@osdl.org> <20040915220016.GC9106@holomorphy.com>
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On Wed, Sep 15, 2004 at 03:00:16PM -0700, William Lee Irwin III wrote:
> William Lee Irwin III <wli@holomorphy.com> wrote:
> >> Zeroing the final partial page during expanding truncate (flushing TLB)
> >> sounds like a reasonable half measure; we don't do anything at the moment.
> 
> On Wed, Sep 15, 2004 at 02:55:24PM -0700, Andrew Morton wrote:
> > Sure about that?  block_truncate_page() gets called.
> 
> So it does; then the hard parts are what's biting aa.

block_truncate_page is unrelated with this issue, it's called on the
_new_ partial page generated by truncate, not on the _old_ partial page
that is being extended to be a _full_ page (with garbage inside between
the old_i_size and PAGE_ALIGN(old_i_size)).

(again s/page/softblock/)
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