From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from cuda.sgi.com (cuda3.sgi.com [192.48.176.15]) by oss.sgi.com (8.14.3/8.14.3/SuSE Linux 0.8) with ESMTP id p5THTg3U125658 for ; Wed, 29 Jun 2011 12:29:42 -0500 Received: from rcsinet10.oracle.com (localhost [127.0.0.1]) by cuda.sgi.com (Spam Firewall) with ESMTP id 8AA521E56152 for ; Wed, 29 Jun 2011 10:29:42 -0700 (PDT) Received: from rcsinet10.oracle.com (rcsinet10.oracle.com [148.87.113.121]) by cuda.sgi.com with ESMTP id j3e6Zlr49QcQBl0b for ; Wed, 29 Jun 2011 10:29:42 -0700 (PDT) Message-ID: <4E0B60DE.50908@oracle.com> Date: Wed, 29 Jun 2011 10:29:02 -0700 From: Sunil Mushran MIME-Version: 1.0 Subject: Re: [PATCH] xfstests 255: add a seek_data/seek_hole tester References: <1309275199-10801-1-git-send-email-josef@redhat.com> <1309275199-10801-5-git-send-email-josef@redhat.com> <20110629065306.GC1026@dastard> <20110629074021.GA26086@infradead.org> <4E0B019E.8080800@draigBrady.com> In-Reply-To: <4E0B019E.8080800@draigBrady.com> List-Id: XFS Filesystem from SGI List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="iso-8859-1"; Format="flowed" Sender: xfs-bounces@oss.sgi.com Errors-To: xfs-bounces@oss.sgi.com To: =?ISO-8859-1?Q?P=E1draig_Brady?= Cc: linux-btrfs@vger.kernel.org, linux-kernel@vger.kernel.org, xfs@oss.sgi.com, Christoph Hellwig , viro@ZenIV.linux.org.uk, linux-fsdevel@vger.kernel.org, Josef Bacik On 06/29/2011 03:42 AM, P=E1draig Brady wrote: > There is the argument, that if this interface can distinguish > these dirty unwritten extents, then why can't the fiemap interface too? > The advantage of the fiemap interface is that it can distinguish > empty extents vs holes. Empty extents will become increasingly common > I think, given the fragmentation and space guarantee benefits they give. > It would be cool for cp for example to be able to efficiently copy > empty extents from source to dest. I'm not too sure about that. Atleast not enabled by default. Most users use cp to backup data. Not empty space. In this case, this empty extent may not even be de-dupable. Frankly I'd be happier of cp started to exploited fallocate() to create lar= ger extents before copying data into them. Atleast for the large files. _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs