From mboxrd@z Thu Jan 1 00:00:00 1970 From: Eric Sandeen Subject: Re: [RFC] Ext3 online defrag Date: Fri, 27 Oct 2006 08:53:58 -0500 Message-ID: <45420F76.90106@redhat.com> References: <20061027162326sho@rifu.tnes.nec.co.jp> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: sho@tnes.nec.co.jp, tytso@mit.edu, jack@suse.cz, linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org Return-path: Received: from mx1.redhat.com ([66.187.233.31]:29094 "EHLO mx1.redhat.com") by vger.kernel.org with ESMTP id S1752192AbWJ0NyS (ORCPT ); Fri, 27 Oct 2006 09:54:18 -0400 To: Alex Tomas In-Reply-To: Sender: linux-fsdevel-owner@vger.kernel.org List-Id: linux-fsdevel.vger.kernel.org Alex Tomas wrote: > 3) scalable reservation > required for delayed allocation to avoid -ENOSPC at flush time. > current version uses per-sb spinlock. Can you elaborate on this issue? Shouldn't delayed allocation decrement free space immediately, and only the actual block location choice is delayed? Or is this due to potential extra metadata space required as blocks are allocated? Thanks, -Eric