Re: XFS filesystem claims to be mounted after a disconnect

[Eric Sandeen <sandeen@sandeen.net>]

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On 5/2/14, 8:47 AM, Martin Papik wrote:
> 
> 
> 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.
> 

platform_check_iswritable() and platform_check_ismounted() in xfsprogs check
these things.

platform_check_ismounted() does a ustat() of the block device,
"ustat() returns  information  about  a mounted file system"
and it knows if it's mounted or not,
"EINVAL: dev does not refer to a device containing a mounted file system."

so something, somewhere thinks it's mounted.  Check /proc/mounts?

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

Hate to say it, but a reboot may be simplest.  Zeroing the log won't
help.

- -Eric

> 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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