From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from bombadil.infradead.org ([198.137.202.9]:38687 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751827AbcI3HIu (ORCPT ); Fri, 30 Sep 2016 03:08:50 -0400 Date: Fri, 30 Sep 2016 00:08:49 -0700 From: Christoph Hellwig To: "Darrick J. Wong" Cc: david@fromorbit.com, linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: Re: [PATCH 02/63] vfs: add a FALLOC_FL_UNSHARE mode to fallocate to unshare a range of blocks Message-ID: <20160930070849.GD18305@infradead.org> References: <147520472904.29434.15518629624221621056.stgit@birch.djwong.org> <147520474825.29434.11791614565389664342.stgit@birch.djwong.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <147520474825.29434.11791614565389664342.stgit@birch.djwong.org> Sender: linux-fsdevel-owner@vger.kernel.org List-ID: On Thu, Sep 29, 2016 at 08:05:48PM -0700, Darrick J. Wong wrote: > Add a new fallocate mode flag that explicitly unshares blocks on > filesystems that support such features. The new flag can only > be used with an allocate-mode fallocate call. We will also need a manpage addition for this. And while we're at it an explanation of fallocate on COW files for btrfs, ocfs2 and XFS as I don't think we are very coherent or obvious at the moment. Well, maybe that's just future work. For now: Reviewed-by: Christoph Hellwig