From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from magic.merlins.org ([209.81.13.136]:41064 "EHLO mail1.merlins.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752542AbeGAXEA (ORCPT ); Sun, 1 Jul 2018 19:04:00 -0400 Date: Sun, 1 Jul 2018 16:03:53 -0700 From: Marc MERLIN To: Chris Murphy Cc: Btrfs BTRFS Message-ID: <20180701230353.sc3ftm6p4hocdaxa@merlins.org> References: <20180701162722.mnm5wjgxc7weymiz@merlins.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii In-Reply-To: Subject: Re: btrfs check of a raid0? Sender: linux-btrfs-owner@vger.kernel.org List-ID: On Sun, Jul 01, 2018 at 01:15:09PM -0600, Chris Murphy wrote: > > How is it supposed to work when you have multiple devices for a btrfs > > filesystem? > > > > gargamel:~# btrfs check --repair -p /dev/bcache2 > > enabling repair mode > > ERROR: mount check: cannot open /dev/bcache2: No such device or address > > ERROR: could not check mount status: No such device or address > > gargamel:~# btrfs check --repair -p /dev/bcache3 > > enabling repair mode > > ERROR: cannot open device '/dev/bcache3': Device or resource busy > > ERROR: cannot open file system > > > > [205248.299528] BTRFS info (device bcache3): disk space caching is enabled > > [205248.320335] BTRFS error (device bcache3): Remounting read-write after error is not allowed > > If it's successfully unmounted, I don't understand the error messages > that it can't be opened. Is umount hung? Sounds to me like btrfs check > thinks it's still mounted. I spent more time on this and apparently because the underlying device had a hardware fault (fell off the bus), its dmcrpyt device is still there but not working. In turn, I can't dmsetup rm it because it's in use by bcache which didn't free it, but bcache won't let me free it because it got removed. So, I'm stuck with a reboot in the end, oh well... Marc -- "A mouse is a device used to point at the xterm you want to type in" - A.S.R. Microsoft is to operating systems .... .... what McDonalds is to gourmet cooking Home page: http://marc.merlins.org/ | PGP 7F55D5F27AAF9D08