From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 13811C433EF for ; Mon, 27 Sep 2021 16:48:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EAFEA60EFD for ; Mon, 27 Sep 2021 16:48:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235510AbhI0QuC (ORCPT ); Mon, 27 Sep 2021 12:50:02 -0400 Received: from mta-201a.oxsus-vadesecure.net ([51.81.229.180]:45787 "EHLO mta-201a.oxsus-vadesecure.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235285AbhI0QuC (ORCPT ); Mon, 27 Sep 2021 12:50:02 -0400 X-Greylist: delayed 304 seconds by postgrey-1.27 at vger.kernel.org; Mon, 27 Sep 2021 12:50:01 EDT DKIM-Signature: v=1; a=rsa-sha256; bh=D095d71dBQW78/giudMG5ZpKsgPW3hOVnZbqSX nWmZk=; c=relaxed/relaxed; d=earthlink.net; h=from:reply-to:subject: date:to:cc:resent-date:resent-from:resent-to:resent-cc:in-reply-to: references:list-id:list-help:list-unsubscribe:list-subscribe:list-post: list-owner:list-archive; q=dns/txt; s=dk12062016; t=1632760999; x=1633365799; b=OdCaG/b5iLIYPcAmFYFClUEZjcBBVHHydAC7Aae0EVscDQMQ6MXOljS ay6DzX3i0UUmIeCUHld6c46tSe/JIIEozQ48xd2hPkF0LR14/UxrlWJh6WLPKT577QnUBx5 rCHCpatUSZgYMAWPrXl7YguAWM8mohzKozk9LK2thr6PAD+1CMkEMUQEPma3KfrMEtQaTVB KGs8ix1Q1yeHP1E4yQaL2i3zZ1LGs9iEJnnElyL9gEE7d3bZATbHbd43A/iRpryEpEX2jbh XQPA1jnssmeU9jkNdbQGZJ8PDckXvjGq8OYPm0h1qefB47nXNYbwhUPc2clpBUlRrWw+WoB +CA== Received: from FRANKSTHINKPAD ([76.105.143.216]) by smtp.oxsus-vadesecure.net ESMTP oxsus2nmtao01p with ngmta id 617a60f5-16a8bb7a5559963b; Mon, 27 Sep 2021 16:43:19 +0000 From: "Frank Filz" To: "'Bernd Schubert'" , "'Kent Overstreet'" , , , References: In-Reply-To: Subject: RE: bcachefs - snapshots Date: Mon, 27 Sep 2021 09:43:19 -0700 Message-ID: <000901d7b3be$c7783120$56689360$@mindspring.com> MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Mailer: Microsoft Outlook 15.0 Content-Language: en-us Thread-Index: AQHCRnh4jFWeawLJluj8xr2TSBBLCwJ/DqcMq873OMA= Precedence: bulk List-ID: X-Mailing-List: linux-bcachefs@vger.kernel.org > On 9/27/21 3:49 AM, Kent Overstreet wrote: > > Snapshots have been merged! 9 months of work and 3k lines of new = code, > > finally released. Some highlights: > > > > - btrfs style subvolumes & snapshots interface > > - snapshots are writeable > > - highly scalable: number of snapshots is limited only by your disk > > space > > - highly space efficient: no internal fragmentation issues > > > > Design doc here: https://bcachefs.org/Snapshots/ > > > > The core functionality is complete - snapshot creation and deletion > > works, fsck changes are done (most of the complexity was in making > > fsck work without O(number of snapshots) performance - tricky). = Everything > else is a todo item: > > > > - still need to export different st_dev for files in different = subvolumes > > (we'll never allocate a new inode with an inode number that = collides with an > > inode inother subvolume - but snapshots will naturally result in = colliding > > inode numbers) >=20 > With my limited high level view on it - shouldn't you discuss with = Neil about a > solution and to avoid going the btrfs route for colliding inode = numbers? I was going to ask that also having been watching the btrfs subvolume = saga. As maintainer of the Ganesha user space NFS server I have an = interest in this also though we haven't had anyone talk about bcachefs = yet. Frank