[Ocfs2-users] Unable to umount a filesystem - OCFS still thinks it has it mounted?‏

[Sunil Mushran]

Check /proc/mounts. That's the kernels view of the mounts.

mount looks at /etc/mtab. And ocfs2 1.2 adds and removes
entries /proc/fs/ocfs2 during mount/umount.

Also, see if there are relevant errors in dmesg.

On 06/16/2011 07:16 PM, Neil Campbell wrote:
>
> Hi all,
>
> Not sure what has happened but I am trying to remove a directory that 
> I thought was copied from an OCFS filesystem.
>
> When I try and remove it I get the typical Device or resource busy error.
>
> This is on RHEL 4 update 8 kernel 2.6.9-89.0.26.ELsmp   running OCFS2 
> version OCFS2 1.2.9 Mon Jan 17 07:38:31 EST 2011 (build 
> 5e8325ec7f66b5189c65c7a8710fe8cb)
>
> Running lsof (as root) on the directory returns nothing.
>
> If I do a mount | grep ocfs I get the following (which is what I expect)
>
>  # mount | grep ocfs
> ocfs2_dlmfs on /dlm type ocfs2_dlmfs (rw)
> /dev/emcpowerq1 on /d00/cfs type ocfs2 (rw,_netdev,heartbeat=local)
> /dev/emcpowere1 on /d00/html type ocfs2 (rw,_netdev,heartbeat=local)
>
>
> However, under cat /proc/fs/ocfs2 there are 3 device entries
>
> ls -l /proc/fs/ocfs2/
>
> dr-xr-xr-x  2 root root 0 Jun  9 15:51 120_257
> dr-xr-xr-x  2 root root 0 Jun  9 15:51 120_65
> dr-xr-xr-x  2 root root 0 Jun  9 15:51 120_66
> -r--r--r--  1 root root 0 Jun  9 15:51 nodename
> -r--r--r--  1 root root 0 Jun  9 15:51 version
>
>
> But on the other 3 servers in this cluster there are only 2
>
> If I look at /dev for those devices they are as follows
>
> [root at dc-c02b01-app01 log]# ls -l /dev | grep 120 | egrep '257|65|66'
> brw-------  1 root root 120,  65 Feb  2 08:16 emcpowere1
> brw-------  1 root root 120,  66 Feb  2 08:16 emcpowere2
> brw-------  1 root root 120, 257 Feb  2 08:16 emcpowerq1
>
>
> emcpowere2 should be umounted and doesn't show up when running mount, 
> but it seems OCFS still thinks it is mounted.
>
> So what can I do to release this ?
>
> Many thanks
> Neil
>

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