linux-kernel - Re: Question about nfs_page_async

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Date:	Thu, 18 Nov 2010 10:27:43 -0500
From:	Trond Myklebust <trond.myklebust@....uio.no>
To:	Peng Tao <lkml.bergwolf@...il.com>
Cc:	linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: Question about nfs_page_async_flush assertion

On Thu, 2010-11-18 at 18:53 +0800, Peng Tao wrote:
> Hi, all,
> 
> nfs_writepages calls into
> write_cache_pages()->nfs_writepages_callback()->nfs_do_writepage()->nfs_page_async_flush(),
> where it asserts BUG_ON(test_bit(PG_CLEAN, &req->wb_flags)).
> My question is: how do we guarantee the request has PG_CLEAN flag set?

We don't. We guarantee that the request has PG_CLEAN cleared, and that
is done when we dirty the page (see nfs_try_to_update_request()).

Cheers
  Trond

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