Q's about IBM TSM (was Re: HEADSUP: ibcs2 and svr4 comp at headed for history)

Thyer, Matthew Matthew.Thyer at dsto.defence.gov.au
Tue Jun 29 21:52:22 PDT 2004

I would love to have this automatic generation/maintenance of /compat/linux/etc/mtab.

This would help me greatly for backup of systems using Linux backup software.

Currently the software (HP OpenView DataProtector) will fail to backup the system if the file does not contain lines regarding the file systems I want to backup.

Ideally this would need some kernel support to handle updating of the file whenever file systems are manually mounted and unmounted.  Remember that Linux's etc/mtab file is to record what is currently mounted.  A simple translation of FreeBSD's /etc/fstab at module load time or system boot time is not really adequate.

-----Original Message-----
From: owner-freebsd-current at freebsd.org
[mailto:owner-freebsd-current at freebsd.org]On Behalf Of Daniel O'Connor
Sent: Wednesday, 30 June 2004 12:11 PM
To: freebsd-current at freebsd.org
Cc: Carl Makin; Paul Mather; Paul Seniura
Subject: Re: Q's about IBM TSM (was Re: HEADSUP: ibcs2 and svr4 compat
headed for history)

Hash: SHA1

On Wed, 30 Jun 2004 01:11, Paul Mather wrote:
> I'm using the Linux TSM client on a FreeBSD 5.2.1-RELEASE-p8
> system.  (See previous message in this thread.)  It was a bit finicky to
> get going.  I found I had better luck using emulators/linux_base-8 than
> emulators/linux_base, though I did get it running under both.  One
> hurdle for most people is that the client aborts with an out of memory
> error during file activities.  I discovered that this is caused by
> having an empty or missing /compat/linux/etc/mtab file.  Creating a
> proper mtab file solves these problems.  One way to do this is via
> something like the following:
> 	sed 's/ufs/ext2/' < /etc/fstab > /compat/linux/etc/mtab
> That way, the Linux TSM "sees" your UFS partitions and will
> backup/restore to them.

I wonder if it could work with an LD_PRELOAD or some other linker trickery..

ie replace open()/read()/write() with something that looks for /etc/mtab and 
instead opens /etc/fstab and translates it on the fly..

I don't use TSM though so I couldn't test it :)

(BTW linux_devtools can be used to make something like this, I wrote one for 
the TeamSpeak port to hide an unimplemented sound ioctl)

- -- 
Daniel O'Connor software and network engineer
for Genesis Software - http://www.gsoft.com.au
"The nice thing about standards is that there
are so many of them to choose from."
  -- Andrew Tanenbaum
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