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=-8.1 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=ham 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 731CBC83007 for ; Tue, 28 Apr 2020 08:55:05 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 40A55206C0 for ; Tue, 28 Apr 2020 08:55:05 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="SRk+X0CL" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 40A55206C0 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:47450 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jTM1A-00068q-CU for qemu-devel@archiver.kernel.org; Tue, 28 Apr 2020 04:55:04 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:52574) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jTLvI-0001PI-Jk for qemu-devel@nongnu.org; Tue, 28 Apr 2020 04:49:52 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.90_1) (envelope-from ) id 1jTLtg-0003H1-0g for qemu-devel@nongnu.org; Tue, 28 Apr 2020 04:48:59 -0400 Received: from us-smtp-delivery-1.mimecast.com ([205.139.110.120]:53739 helo=us-smtp-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1jTLtf-0003Fb-E6 for qemu-devel@nongnu.org; Tue, 28 Apr 2020 04:47:19 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1588063638; h=from:from:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=gdtSg4sFElGKRHB93bsvKygAyZunxV2v1pnxI4HTBJU=; b=SRk+X0CLj5NdufiNWN/VKd1DlD0+JWtJQLkxYXkhhU94gV/yqhMy740qyYxbHulnR1w9EW 9maahhupH8TawnF565i2GS5ZWlS6+M1ZkSzVjkJ9D2oFFVZ1xel3X6gafe5qL1nFhNOM/X 9/GS8e8cBJgGLkxIzQhF58AImwZR+N4= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-386-Gs5ZvrnTMBq6VXyprtVkYw-1; Tue, 28 Apr 2020 04:47:10 -0400 X-MC-Unique: Gs5ZvrnTMBq6VXyprtVkYw-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 5FF628AB3AB for ; Tue, 28 Apr 2020 08:47:09 +0000 (UTC) Received: from redhat.com (unknown [10.36.110.58]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 7D81F5D9E2; Tue, 28 Apr 2020 08:47:02 +0000 (UTC) Date: Tue, 28 Apr 2020 09:46:58 +0100 From: Daniel =?utf-8?B?UC4gQmVycmFuZ8Op?= To: "Dr. David Alan Gilbert" Subject: Re: [PATCH] virtiofsd: Show submounts Message-ID: <20200428084658.GA1374620@redhat.com> References: <20200424133516.73077-1-mreitz@redhat.com> <20200427175902.GM2923@work-vm> MIME-Version: 1.0 In-Reply-To: <20200427175902.GM2923@work-vm> User-Agent: Mutt/1.13.3 (2020-01-12) X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Content-Disposition: inline Received-SPF: pass client-ip=205.139.110.120; envelope-from=berrange@redhat.com; helo=us-smtp-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/04/28 02:16:38 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] X-Received-From: 205.139.110.120 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Daniel =?utf-8?B?UC4gQmVycmFuZ8Op?= Cc: virtio-fs@redhat.com, qemu-devel@nongnu.org, Stefan Hajnoczi , Max Reitz Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Mon, Apr 27, 2020 at 06:59:02PM +0100, Dr. David Alan Gilbert wrote: > * Max Reitz (mreitz@redhat.com) wrote: > > Currently, setup_mounts() bind-mounts the shared directory without > > MS_REC. This makes all submounts disappear. > >=20 > > Pass MS_REC so that the guest can see submounts again. >=20 > Thanks! >=20 > > Fixes: 3ca8a2b1c83eb185c232a4e87abbb65495263756 >=20 > Should this actually be 5baa3b8e95064c2434bd9e2f312edd5e9ae275dc ? >=20 > > Signed-off-by: Max Reitz > > --- > > tools/virtiofsd/passthrough_ll.c | 2 +- > > 1 file changed, 1 insertion(+), 1 deletion(-) > >=20 > > diff --git a/tools/virtiofsd/passthrough_ll.c b/tools/virtiofsd/passthr= ough_ll.c > > index 4c35c95b25..9d7f863e66 100644 > > --- a/tools/virtiofsd/passthrough_ll.c > > +++ b/tools/virtiofsd/passthrough_ll.c > > @@ -2643,7 +2643,7 @@ static void setup_mounts(const char *source) > > int oldroot; > > int newroot; > > =20 > > - if (mount(source, source, NULL, MS_BIND, NULL) < 0) { > > + if (mount(source, source, NULL, MS_BIND | MS_REC, NULL) < 0) { > > fuse_log(FUSE_LOG_ERR, "mount(%s, %s, MS_BIND): %m\n", source,= source); > > exit(1); > > } >=20 > Do we want MS_SLAVE to pick up future mounts that might happenf rom the > host? I think that probably makes sense to have MS_SLAVE by default, as that means the set of files exposed to the guest is consistent across a QEMU restart. Without MS_SLAVE new mounts aren't visible until after QEMU is restarted which is likely surprising/undesirable to admins. Regards, Daniel --=20 |: https://berrange.com -o- https://www.flickr.com/photos/dberrange= :| |: https://libvirt.org -o- https://fstop138.berrange.com= :| |: https://entangle-photo.org -o- https://www.instagram.com/dberrange= :|