From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dave Chinner Subject: Re: [patch][rfc] mm: hold page lock over page_mkwrite Date: Sun, 1 Mar 2009 19:17:44 +1100 Message-ID: <20090301081744.GI26138@disturbed> References: <20090225093629.GD22785@wotan.suse.de> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: linux-fsdevel@vger.kernel.org, Linux Memory Management List To: Nick Piggin Return-path: Content-Disposition: inline In-Reply-To: <20090225093629.GD22785@wotan.suse.de> Sender: owner-linux-mm@kvack.org List-Id: linux-fsdevel.vger.kernel.org On Wed, Feb 25, 2009 at 10:36:29AM +0100, Nick Piggin wrote: > I need this in fsblock because I am working to ensure filesystem metadata > can be correctly allocated and refcounted. This means that page cleaning > should not require memory allocation (to be really robust). Which, unfortunately, is just a dream for any filesystem that uses delayed allocation. i.e. they have to walk the free space trees which may need to be read from disk and therefore require memory to succeed.... Cheers, Dave. -- Dave Chinner david@fromorbit.com -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org