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 X-Spam-Level: X-Spam-Status: No, score=-3.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 16274C433B4 for ; Sun, 11 Apr 2021 07:10:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id AE2D8611CE for ; Sun, 11 Apr 2021 07:10:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231356AbhDKHKw (ORCPT ); Sun, 11 Apr 2021 03:10:52 -0400 Received: from rin.romanrm.net ([51.158.148.128]:60648 "EHLO rin.romanrm.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229792AbhDKHKv (ORCPT ); Sun, 11 Apr 2021 03:10:51 -0400 Received: from natsu (natsu2.home.romanrm.net [IPv6:fd39::e99e:8f1b:cfc9:ccb8]) by rin.romanrm.net (Postfix) with SMTP id 6F7B444; Sun, 11 Apr 2021 07:10:34 +0000 (UTC) Date: Sun, 11 Apr 2021 12:10:34 +0500 From: Roman Mamedov To: Chris Murphy Cc: Paul Leiber , "linux-btrfs@vger.kernel.org" Subject: Re: Parent transid verify failed (and more): BTRFS for data storage in Xen VM setup Message-ID: <20210411121034.373468ac@natsu> In-Reply-To: References: <20210410194842.71f49059@natsu> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org On Sat, 10 Apr 2021 17:06:22 -0600 Chris Murphy wrote: > Right. The block device (partition containing the Btrfs file system) > must be exclusively used by one kernel, host or guest. Dom0 or DomU. > Can't be both. > > The only exception I'm aware of is virtiofs or virtio-9p, but I > haven't messed with that stuff yet. If you want an FS that allows a block device to be mounted by multiple machines at the same time, there are a few: https://en.wikipedia.org/wiki/Clustered_file_system#Shared-disk_file_system -- With respect, Roman