XFS filesystem claims to be mounted after a disconnect

[Martin Papik <mp6058@gmail.com>]

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I ran into a problem using XFS. The USB device on which I have an XFS
file system got disconnected and xfs_repair and xfs_check fail with a
message saying the file system is mounted writable. There is no entry
in /etc/mtab or /proc/mounts. However I see messages in the kernel log
(dmesg) about write failures to the disconnected drive.


Please let me know what I can do short of zeroing the log, which I
believe would result in some data loss.

Martin


# xfs_repair /dev/sdd104
xfs_repair: /dev/sdd104 contains a mounted filesystem

fatal error -- couldn't initialize XFS library
# xfs_check /dev/sdd104
xfs_check: /dev/sdd104 contains a mounted and writable filesystem

fatal error -- couldn't initialize XFS library


partial dmesg output:

[346220.652432] Buffer I/O error on device sdb104, logical block
3906961152
[346220.652440] Buffer I/O error on device sdb104, logical block
3906961153
[346220.652443] Buffer I/O error on device sdb104, logical block
3906961154
[346220.652446] Buffer I/O error on device sdb104, logical block
3906961155
[346220.652449] Buffer I/O error on device sdb104, logical block
3906961156
[346220.652452] Buffer I/O error on device sdb104, logical block
3906961157
[346220.652455] Buffer I/O error on device sdb104, logical block
3906961158
[346220.652459] Buffer I/O error on device sdb104, logical block
3906961159
[346220.652473] Buffer I/O error on device sdb104, logical block
3906961352
[346220.652476] Buffer I/O error on device sdb104, logical block
3906961353
[346554.917502] quiet_error: 1924 callbacks suppressed
[346554.917510] Buffer I/O error on device sdb104, logical block 0
[346554.917518] Buffer I/O error on device sdb104, logical block 1
[346554.917522] Buffer I/O error on device sdb104, logical block 2
[346554.917525] Buffer I/O error on device sdb104, logical block 3
[346554.917529] Buffer I/O error on device sdb104, logical block 4
[346554.917532] Buffer I/O error on device sdb104, logical block 5
[346554.917536] Buffer I/O error on device sdb104, logical block 6
[346554.917539] Buffer I/O error on device sdb104, logical block 7
[346554.951030] Buffer I/O error on device sdb104, logical block
3906961152
[346554.951051] Buffer I/O error on device sdb104, logical block
3906961153

The current disk is /dev/sdd104 and sdb104 doesn't appear anywhere in
the kernel, despite the messages in dmesg.

# cat /proc/partitions
major minor  #blocks  name

   7        0     131072 loop0
   8        0  488386584 sda
   8        1     204800 sda1
   8        2  104384512 sda2
   8        3          1 sda3
   8        4   15471640 sda4
   8        5   30403584 sda5
   8        6     104391 sda6
   8        7  117187584 sda7
  11        0    1048575 sr0
   8       64 1953481728 sde
   8       75 1953480687 sde11
   8       80  312571224 sdf
   8       48 1953481728 sdd
 259        0 1953480687 sdd104


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