Re: mount & umount read-only floppy: unmount failed: Input/output error ??

From: Rob (listone_at_deathbeforedecaf.net)
Date: 06/30/03

  • Next message: Rob Lahaye: "Re: mount & umount read-only floppy: unmount failed: Input/output error ??" 
    To: "Rob Lahaye" <lahaye@users.sourceforge.net>, <freebsd-questions@freebsd.org>
Date: Mon, 30 Jun 2003 20:30:06 +0930

    I think I've figured it out - here's a script(1) of trying to mount a
    write-protected floppy:

      root@goo # uname -sr
      FreeBSD 4.8-RELEASE
      root@goo # mount /dev/fd0 /mnt
      root@goo # ll /mnt
      total 3
      drwxr-xr-x 2 root wheel 512 Jun 28 14:04 .
      drwxr-xr-x 21 root wheel 512 May 19 18:57 ..
      root@goo # umount /mnt
      umount: unmount of /mnt failed: Input/output error

    However, here's the vidcontrol(1) dump of the same commands:

      root@goo # uname -sr
      FreeBSD 4.8-RELEASE
      root@goo # mount /dev/fd0 /mnt
      fd0c: hard error writing fsbn 240 (ST0 40<abnrml> ST1 2<write_protect>
    ST2 0 cyl 6 hd 1 sec 7)
      root@goo # ll /mnt
      total 3
      drwxr-xr-x 2 root wheel 512 Jun 28 14:04 .
      drwxr-xr-x 21 root wheel 512 May 19 18:57 ..
      root@goo # umount /mnt
      fd0c: hard error writing fsbn 56 of 56-63 (ST0 40<abnrml> ST1
    2<write_protect> ST2 0 cyl 1 hd 1 sec 3)
      fd0c: hard error writing fsbn 240 (ST0 40<abnrml> ST1 2<write_protect>
    ST2 0 cyl 6 hd 1 sec 7)
      fd0c: hard error writing fsbn 240 (ST0 40<abnrml> ST1 2<write_protect>
    ST2 0 cyl 6 hd 1 sec 7)
      fd0c: hard error writing fsbn 16 of 16-18 (ST0 40<abnrml> ST1
    2<write_protect> ST2 0 cyl 0 hd 0 sec 17)
      fd0c: hard error writing fsbn 56 of 56-63 (ST0 40<abnrml> ST1
    2<write_protect> ST2 0 cyl 1 hd 1 sec 3)
      fd0c: hard error writing fsbn 16 of 16-18 (ST0 40<abnrml> ST1
    2<write_protect> ST2 0 cyl 0 hd 0 sec 17)
      fd0c: hard error writing fsbn 56 of 56-63 (ST0 40<abnrml> ST1
    2<write_protect> ST2 0 cyl 1 hd 1 sec 3)
      fd0c: hard error writing fsbn 240 (ST0 40<abnrml> ST1 2<write_protect>
    ST2 0 cyl 6 hd 1 sec 7)
      fd0c: hard error writing fsbn 16 of 16-18 (ST0 40<abnrml> ST1
    2<write_protect> ST2 0 cyl 0 hd 0 sec 17)
      fd0c: hard error writing fsbn 56 of 56-63 (ST0 40<abnrml> ST1
    2<write_protect> ST2 0 cyl 1 hd 1 sec 3)
      fd0c: hard error writing fsbn 240 (ST0 40<abnrml> ST1 2<write_protect>
    ST2 0 cyl 6 hd 1 sec 7)
      fd0c: hard error writing fsbn 16 of 16-18 (ST0 40<abnrml> ST1
    2<write_protect> ST2 0 cyl 0 hd 0 sec 17)
      fd0c: hard error writing fsbn 56 of 56-63 (ST0 40<abnrml> ST1
    2<write_protect> ST2 0 cyl 1 hd 1 sec 3)
      fd0c: hard error writing fsbn 240 (ST0 40<abnrml> ST1 2<write_protect>
    ST2 0 cyl 6 hd 1 sec 7)
      fd0c: hard error writing fsbn 16 of 16-18 (ST0 40<abnrml> ST1
    2<write_protect> ST2 0 cyl 0 hd 0 sec 17)
      umount: unmount of /mnt failed: Input/output error

    Since I'm doing this on ttyv0, I see the errors on the console - but
    they don't appear in the typescript.

    I'm guessing that you're doing this in a non-console shell, and the
    errors are appearing elsewhere - maybe /var/log/messages?

    ----- Original Message -----
    From: "Rob Lahaye" <lahaye@users.sourceforge.net>
    Subject: Re: mount & umount read-only floppy: unmount failed:
    Input/output error ??

    >
    > Rob wrote:
    > > That's strange - I get errors as soon as I try and do this, before
    the
    > > filesystem is even available.
    > >
    > > Perhaps the updates from mounting the floppy aren't being written
    out to
    > > the actual media until you try to unmount it - some kind of caching
    > > issue?
    > >
    > > What happens if you try to touch a file on the (incorrectly)
    writeable
    > > floppy?
    >
    > Are you also using FreeBSD 4.8?
    >
    > I have created the installation floppy from the kern.flp file.
    > I then made this floppy readonly. I put that into my floppy drive
    > and...
    >
    > # mount -t ufs /dev/fd0 /mnt
    > # ls -lo /mnt
    > total 1301
    > drwxr-xr-x 2 root wheel - 512 Apr 3 20:06 boot
    > -r-xr-xr-x 1 root wheel - 1324900 Apr 3 20:06 kernel.gz
    > # touch /mnt/kernel.gz
    > # ls -lo /mnt
    > total 1301
    > drwxr-xr-x 2 root wheel - 512 Apr 3 20:06 boot
    > -r-xr-xr-x 1 root wheel - 1324900 Jun 30 19:17 kernel.gz
    > # umount /mnt
    > umount: unmount of /mnt failed: Input/output error
    > #
    >
    > Notice that the time has changed due to the 'touch' of the file
    > despite being readonly!!
    >
    > The very little I know about filesystems, I guess the 'touch' has
    > been applied to the cache, not to the actual floppy.
    > The umount forces a sync, which can't be done due to readonly.
    >
    > Something is fishy here, isn't it?
    >
    > Rob.
    >
    > _______________________________________________
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  • Next message: Rob Lahaye: "Re: mount & umount read-only floppy: unmount failed: Input/output error ??"

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