Re: Can't scan new disk

[Mark Allums <mark@allums.email>]

On 2/20/19 3:20 AM, Alexander V. Makartsev wrote:
> 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 <mark@allums.email> 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


The disk is not mounted.