From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262683AbVG2Rxf (ORCPT ); Fri, 29 Jul 2005 13:53:35 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262684AbVG2Rxe (ORCPT ); Fri, 29 Jul 2005 13:53:34 -0400 Received: from smtp.osdl.org ([65.172.181.4]:30863 "EHLO smtp.osdl.org") by vger.kernel.org with ESMTP id S262683AbVG2Rx2 (ORCPT ); Fri, 29 Jul 2005 13:53:28 -0400 Date: Fri, 29 Jul 2005 10:52:20 -0700 From: Andrew Morton To: Andrey Borzenkov Cc: linux-kernel@vger.kernel.org Subject: Re: Syncing single filesystem (slow USB writing) Message-Id: <20050729105220.4004e794.akpm@osdl.org> In-Reply-To: <200507291544.23545.arvidjaar@mail.ru> References: <200507290731.32694.arvidjaar@mail.ru> <200507291428.06903.arvidjaar@mail.ru> <20050729042000.48c40272.akpm@osdl.org> <200507291544.23545.arvidjaar@mail.ru> X-Mailer: Sylpheed version 1.0.4 (GTK+ 1.2.10; i386-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Andrey Borzenkov wrote: > > On Friday 29 July 2005 15:20, Andrew Morton wrote: > > Andrey Borzenkov wrote: > > > On Friday 29 July 2005 07:50, Andrew Morton wrote: > > > > > One idea how to improve situation - continue to mount with dsync > > > > > (having basically old case) and do frequent sync of filesystem (this > > > > > culd be started as HAL callout or whatever). Unfortunately, I could > > > > > not find a way to request a sync (flush) of single mount point or > > > > > block device. Have I missed something? > > > > > > > > It's trivial to do in-kernel but no, I'm afraid there isn't a userspace > > > > interface for this. > > > > > > apparently one should not ask such a question at 7 am. Any reason why > > > BLKFLSBUF does not suite? > > > > That'll only write back data associated with /dev/hdXX (ie: filesystem > > metadata) and not the data associated with all the files in the filesystem > > which is mounted on /dev/hdXX. > > I am confused. BKLFLSBUF boils down to sync_inodes_sb for mounted device, and > that appears to write out direty inode pages? Oh, you're right. How cunning. Yes, `blockdev --flushbufs /dev/hda1' would indeed appear to sync all data associated with that device.