Re: Finding who is using an NFS mount?

[Jim Oberholtzer <midrangel@xxxxxxxxxxxxxxxxx>]

I doubt there is a way to really know who is using a preset mount.  They
just use the GID/UID from the mount command.

I set up a mount for /home/anyone using profile anyone (UID 21567/GID
21999).  Then other folks access the files in that mounted directory.  They
are going to do it as profile anyone, not their own profile.  The target
must have UID/GID that is the same as anyuser, but it could be any other
profile, as long as the GID/UID are the same.

--
Jim Oberholtzer
Chief Technical Architect
Agile Technology Architects


On Wed, Nov 3, 2021 at 12:08 PM Rob Berendt <rob@xxxxxxxxx> wrote:

> I have a sandbox lpar (GDI) exporting a directory for testing this issue.
> EXPORTFS OPTIONS('-I -O') DIR('/tmp')
> strNFSSVR SERVER(*ALL)
>
> I have another lpar mounting over this
> md '/gdi'
> md '/gdi/tmp'
> MOUNT TYPE(*NFS) MFS('gdi:/tmp')          MNTOVRDIR('/gdi/tmp')
>       OPTIONS('rw,suid,retry=5,rsize=32768,wsize=32768,timeo=20,retrans=5,
>                acregmin=30,acregmax=60,acdirmin=30,acdirmax=60,soft,async,
>                sec=sys,vers=3:2,nocache')
> Then I use it with:
> edtf   '/gdi/tmp/test.txt'
>
> From another session I am trying to see if I can tell who is using that
> mount.
>
> The following returns nothing:
> SELECT * FROM TABLE(QSYS2.IFS_OBJECT_LOCK_INFO(PATH_NAME => '/gdi/tmp'));
>
> The following returns data, but I may not know the exact file they are
> working on:
> SELECT * FROM TABLE(QSYS2.IFS_OBJECT_LOCK_INFO(PATH_NAME =>
> '/gdi/tmp/test.txt'));
>
> This doesn't return a hit:
> SELECT * FROM QSYS2.NETSTAT_INFO
>   WHERE REMOTE_ADDRESS = '10.10.6.144';
> unless I start some other communication to that lpar.
>
> The old Navigator has this:
>
> https://www.ibm.com/docs/en/i/7.4?topic=i-working-dynamically-mounted-file-systems
> But the new Navigator does not so I'm guessing there's currently no sql
> service for this information.
> The information from the old Navigator does list the mount but does not
> say whether or not it is in use or by whom.
>
> The problem is that if I go to unmount that, it pitches a fit because it
> is in use.  I'm trying to figure out who is using it.
>
>
> Rob Berendt
> --
> IBM Certified System Administrator - IBM i 6.1
> Group Dekko
> Dept 1600
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