From mboxrd@z Thu Jan  1 00:00:00 1970
From: Shaya Potter <spotter@cs.columbia.edu>
Subject: Re: up/down semaphores in writepage()?
Date: Fri, 30 Apr 2004 09:36:13 -0400
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To: Matthew Wilcox <willy@debian.org>
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On Fri, 2004-04-30 at 12:42 +0100, Matthew Wilcox wrote:
> On Thu, Apr 29, 2004 at 05:13:18PM -0400, Shaya Potter wrote:
> > Is that allowed?  My guess is yes, but sort of gut without any firm
> > belief.
> 
> see Documentation/filesystems/Locking ...
> 
> locking rules:
>         All except set_page_dirty may block
> 
>                         BKL     PageLocked(page)
> writepage:              no      yes, unlocks (see below)

thanks! needed that!