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List:       intermezzo-devel
Subject:    Re: progress report
From:       Peter Braam <braam () clusterfs ! com>
Date:       2003-01-23 19:40:14
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Chen Yang, 

Getting it running is pretty critical.  Following the events that
happen during startup with user mode linux will be very important. 

After module is inserted you can intercept the "read_super" command
and that should help you see what is happening.  A LOT is happening in
the beginning, even before intersync is started.

Intersync opens a device file /dev/intermezzo.  It listens to that
using select to receive commands from the kernel.  It also writes
replies to command to that device.  Further more it makes ioctls to
the mount point directory, which are handled in the directory ioctl
function in the kernel code.

If intersync dies the kernel only sees a close on the intermezzo
device.  That shold clean stuff up. 

- Peter -




On Fri, Jan 24, 2003 at 01:12:29AM +0800, Chen Yang wrote:
> Hi,All:
>    After some days prepairations, I think I'm
> now ready for the intermezzo related work.
>    (1) Read papers and HOWTO's on intermezzo,this
> is a require part for my work in this area.I think
> I have done this part.
>    (2) Test InterMezzo as the HOWTO wrote. I
> suscribed the Intermezzo Discussion/Develop/Announce
> Mailling list. I will take care the problems they
> met and try to solve them.
>    (3)Merge the proposed patches other posted in the
> mailling list. I have finished the part but haven't
> tried it.
> 
>    To the Bugs related to InterMezzo,
>     I) Some guy reported that the httpd.conf is overwritten
> every time, I have proposed the patch for it.[Bugzilla 614#]
>     II) Some guy reported that if kill intersync and then
> remove the intermezzo module will cause the Oops. At present,
> I haven't proposed patch for it.I suspect it is due to the
> Intermezzo's upcall scheme, the unexpected killing will make
> problems.I can't get the confirmation from others.I will study
> the code for more information.[Bugzilla 624#]
>     III) Some guy in mailling list reported a strange problem,
> and Radhika has registered on sourceforge as a bug[666827].
> 
>     My experiment on InterMezzo:
>     I'm disappointed here to say that I haven't made it run
> even now. I have two systems. One is RedHat 8.0 installed
> in VMWARE on my laptop, the other is RedHat 7.1 on a Celeron
> 733/128M RAM system. The RH8 is with 2.4.18-4 kernel,and
> RH7.1 is with official 2.4.18 kernel with some ipv6 patch,
> both with the izo fromCVS.I have no problem to build the modules
> and binary utilities.But When I try to run as the HOWTO said,
> it refuse to run correctly. On my RH7.1 2.4.18 kernel, after installing
> the module try to mount the newly added partition as intermezzo, it will
> print error message as segment fault.I will try a clean 2.4.19 tomorrow.
> On my RH8, I referenced the HOWTO in doc directory, and added the "-o
> data=journal" to the mount command line, it mount it correctly, but the
> file system is mounted READONLY.
>     Any good ideas? I will try to solve them.
> --
>    Chen Yang
- Peter -


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