From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754303AbbDUKXy (ORCPT ); Tue, 21 Apr 2015 06:23:54 -0400 Received: from mail-pd0-f181.google.com ([209.85.192.181]:34821 "EHLO mail-pd0-f181.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751297AbbDUKXw (ORCPT ); Tue, 21 Apr 2015 06:23:52 -0400 Date: Tue, 21 Apr 2015 03:23:42 -0700 (PDT) From: Hugh Dickins X-X-Sender: hugh@eggly.anvils To: NeilBrown cc: Christoph Hellwig , Al Viro , David Howells , Chris Mason , Josef Bacik , David Sterba , Dave Chinner , linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-btrfs@vger.kernel.org Subject: Re: [PATCH 3/3] btrfs: set FS_SUPPORTS_SEEK_HOLE flag. In-Reply-To: <20150421084312.GA1088@infradead.org> Message-ID: References: <20150420193347.29378d69@notabene.brown> <20150420052752.26554.13596.stgit@notabene.brown> <20150420052558.26554.97143.stgit@notabene.brown> <30419.1429519662@warthog.procyon.org.uk> <31824.1429523209@warthog.procyon.org.uk> <20150420094855.GA21116@infradead.org> <20150420125835.GJ889@ZenIV.linux.org.uk> <20150421084312.GA1088@infradead.org> User-Agent: Alpine 2.11 (LSU 23 2013-08-11) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 21 Apr 2015, Christoph Hellwig wrote: > On Mon, Apr 20, 2015 at 01:58:35PM +0100, Al Viro wrote: > > > > Do ext4 and xfs support this, do you know? > > > > > > Yes. As do f2fs, ocfs2, gfs2, ceph and NFSv4.2 > > > > Er... Nominally, gfs2 supports it. By treating all files as "there's a > > hole starting at EOF". Same as ext2 or even minix... > > Yeah remove gfs2 from the list. But please add tmpfs to the list - though I doubt you're interested in caching its files. Hugh