On 20.02.2019 11:16, Mark Allums wrote: > On 2/17/19 10:59 PM, Alexander V. Makartsev wrote: >> On 17.02.2019 1:21, Mark Allums wrote: >>> On 2/16/19 2:41 AM, Curt wrote: >>>> On 2019-02-15, Mark Allums <[email protected]> wrote: >>>>> I just bought a new backup disk, and I want to check it. It's >>>>> mounted in >>>>> a USB dock. >>>>> >>>>> Running the following gives an error: >>>>> >>>>> root@martha:~# umount /dev/sdb1 >>>>> root@martha:~# e2fsck -c -c -C 0 -f -F -k -p /dev/sdb1 >>>>> /dev/sdb1 is in use. >>>>> e2fsck: Cannot continue, aborting. >>>>> >>>>> What's causing this and how do I fix it? It's not MATE; I tried >>>>> rebooting to rescue mode, but that didn't help. >>>>> >>>>> Mark >>>> >>>> People sometimes recommend 'fuser' in cases like these in order to >>>> identify processes that might be accessing the drive. >>>> >>>> I mean, the message says '/dev/sdb1 is in use.' Perhaps it is indeed. >>>> >>>> fuser -v -m /dev/sdb1 >>>> >>>> Worth a try, maybe, as no one else seems to have suggested it. >>> >>> root@martha:~# fuser -v -m /dev/sdb1 >>> root@martha:~# >>> >>> No results. Thanks. >>> >>> Mark >>> >> Maybe something simple like "lsof" command can shed some light on >> this problem? >> $ sudo lsof /dev/sdb >> $ sudo lsof /dev/sdb1 > > root@martha:~# lsof /dev/sdb > lsof: WARNING: can't stat() fuse.gvfsd-fuse file system > /run/user/1001/gvfs > Output information may be incomplete. > root@martha:~# lsof /dev/sdb1 > lsof: WARNING: can't stat() fuse.gvfsd-fuse file system > /run/user/1001/gvfs > Output information may be incomplete. > root@martha:~# > There you have it. "lsof" command should not output anything if examined object is not in use. I assume that "/dev/sdb1" gets auto-mounted by gvfsd [1] for user with UID 1001. AFAIK GIO and company implements different mounting scheme without involving traditional kernel mounting and allow to restrict mounted devices only for user who mounted them. So even root user can't access them if they are mounted by other user. Try to use gio [2] utility to check status and unmount "/dev/sdb1" device.
[1] man gvfsd [2] man gio -- With kindest regards, Alexander. ⢀⣴⠾⠻⢶⣦⠀ ⣾⠁⢠⠒⠀⣿⡁ Debian - The universal operating system ⢿⡄⠘⠷⠚⠋⠀ https://www.debian.org ⠈⠳⣄⠀⠀⠀⠀
