From owner-freebsd-bugs@freebsd.org Tue Jul 31 19:02:55 2018 Return-Path: Delivered-To: freebsd-bugs@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 487A01061F8E for ; Tue, 31 Jul 2018 19:02:55 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mailman.ysv.freebsd.org (mailman.ysv.freebsd.org [IPv6:2001:1900:2254:206a::50:5]) by mx1.freebsd.org (Postfix) with ESMTP id D868277B53 for ; Tue, 31 Jul 2018 19:02:54 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: by mailman.ysv.freebsd.org (Postfix) id 9D1191061F8D; Tue, 31 Jul 2018 19:02:54 +0000 (UTC) Delivered-To: bugs@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 605F81061F8C for ; Tue, 31 Jul 2018 19:02:54 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mxrelay.ysv.freebsd.org (mxrelay.ysv.freebsd.org [IPv6:2001:1900:2254:206a::19:3]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "mxrelay.ysv.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id E8BF477B4B for ; Tue, 31 Jul 2018 19:02:53 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2001:1900:2254:206a::16:76]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.ysv.freebsd.org (Postfix) with ESMTPS id 50E3F12391 for ; Tue, 31 Jul 2018 19:02:53 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org ([127.0.1.118]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id w6VJ2r5Q016029 for ; Tue, 31 Jul 2018 19:02:53 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id w6VJ2rUP016028 for bugs@FreeBSD.org; Tue, 31 Jul 2018 19:02:53 GMT (envelope-from bugzilla-noreply@freebsd.org) X-Authentication-Warning: kenobi.freebsd.org: www set sender to bugzilla-noreply@freebsd.org using -f From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 230220] UFS: the freezing ioctl (i.e.UFSSUSPEND) causes panic or EBUSY Date: Tue, 31 Jul 2018 19:02:53 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: kern X-Bugzilla-Version: CURRENT X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Some People X-Bugzilla-Who: decui@microsoft.com X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: bugs@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: freebsd-bugs@freebsd.org X-Mailman-Version: 2.1.27 Precedence: list List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 31 Jul 2018 19:02:55 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D230220 --- Comment #9 from Dexuan Cui --- Thanks for the patch that removes the KASSERT for the panic! I still don't know how to correctly freeze all the mounted file systems. Can you please elaborate it? I do have multiple mounted file systems. My purpos= e is that:=20 1. Freeze all the mounted file systems, so any write access is suspended; 2. The host (i.e. Hyper-V) can take a quick snapshot of the guest image. The snapshot is file system consistent. 3. The guest can thaw the file systems, so any suspended write can resume. Assuming I have these 3 mounted file systems, should I freeze (and then tha= w) all of them? What order should I use -- freezing /mnt and /opt before / ? /dev/da0s1a on / (ufs, local, journaled soft-updates) /dev/da2p1 on /mnt (ufs, local, soft-updates) /dev/da2p2 on /opt (ufs, local, soft-updates) What' the correct way to thaw all the file systems -- by just closing the /dev/ufssuspend file descriptor, or callling ioctl(g_ufs_suspend_handle, UFSRESUME, ...) for every mounted file systems I froze by ioctl(g_ufs_suspend_handle, UFSSUSPEND, ...) ? According to https://lists.freebsd.org/pipermail/freebsd-fs/2015-February/020805.html, it looks I should use ioctl with UFSSUSPEND and UFSRESUME, but I need to figure out why contrib/hyperv/tools/hv_vss_daemon.c didn't do that in the first place. It looks there is no good document about how the UFSSUSPEND/UFSRESUME ioctl should be correctly used.=20 Linux has a utility fsfreeze: https://linux.die.net/man/8/fsfreeze, but it looks the equivalent utility doesn't exist in FreeBSD. --=20 You are receiving this mail because: You are the assignee for the bug.=