From: Andrew Morton Subject: booked-page-flag.patch Date: Thu, 15 Feb 2007 00:45:04 -0800 Message-ID: <20070215004504.023a90f0.akpm@linux-foundation.org> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Cc: "linux-ext4@vger.kernel.org" To: "Theodore Ts'o" , Alex Tomas Return-path: Received: from smtp.osdl.org ([65.172.181.24]:39814 "EHLO smtp.osdl.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965331AbXBOIpk (ORCPT ); Thu, 15 Feb 2007 03:45:40 -0500 Sender: linux-ext4-owner@vger.kernel.org List-Id: linux-ext4.vger.kernel.org Sorry, we're seriously, seriously, seriously short on flags in the page struct and this patch is going to need one heck of a good case for it to be acceptable. Even then, we should put a lot of effort into finding some way of avoiding adding that page flag. One option might be to add a new radix-tree tag, and defining it as "for filesytem usage". Or use PG_checked (which should be renamed to to PG_fs_misc) (if that doesn't conflict with ext4's existing use of PG_checked). Or use !PageMappedToDisk()? These patches seem to have a number of issues - we should get them properly commented and properly changelogged then get them on the wire for decent review before investing too much in them, please.