linux-kernel - Re: Question about invalidate_inode_pages2

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Message-Id: <1256171635.6809.6.camel@heimdal.trondhjem.org>
Date:	Wed, 21 Oct 2009 20:33:55 -0400
From:	Trond Myklebust <trond.myklebust@....uio.no>
To:	Peng Tao <lkml.bergwolf@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Question about invalidate_inode_pages2_range()

On Wed, 2009-10-21 at 12:08 +0800, Peng Tao wrote:
> On Tue, Oct 20, 2009 at 1:25 PM, Trond Myklebust
> <trond.myklebust@....uio.no> wrote:
> > On Mon, 2009-10-19 at 16:38 +0800, Peng Tao wrote:
> >> 2. Is there any interface in the mm subsystem forces discarding a page cache?
> >
> > You mean that also discards dirty pages? Yes. That is what
> > truncate_inode_pages() does...
> But truncate_inode_pages() truncates all pages beyond lstart.
> Is there any way to discard a single page?
> truncate_inode_page() seems to be able to do the magic. But it is not exported.

truncate_inode_pages_range() is your friend...

Cheers
  Trond

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