[1036] in Moira
Re: chowning a volume to a gid
daemon@ATHENA.MIT.EDU (Greg Hudson)
Thu Dec 12 06:22:08 1996
Date: Wed, 11 Dec 1996 04:15:09 -0500
From: Greg Hudson <ghudson@MIT.EDU>
To: Jonathon Weiss <jweiss@MIT.EDU>
Cc: afsdev@MIT.EDU, moiradev@MIT.EDU
In-Reply-To: "[531] in AFS-developers"
Well, I didn't wait for an answer before going off and implementing
what I proposed. I hope you don't mind too much; I figured a
four-hour response time was worth the lack of communication,
especially since I didn't know how to write Solaris kernel modules
before you sent your mail. :)
In /afs/dev.mit.edu/user/ghudson/uchown, you will find sources for a
kernel module and a userland program which implement an unrestricted
version of the chown system call. I borrowed nine lines of code from
the Solaris kernel (the body of the "uchown" system call with a few
lines deleted), so you cannot distribute the kernel module source
outside of MIT. jweiss and dkk have access to the directory; I didn't
give danw access because he's not full-time staff. (This is a piddly
amount of Solaris source code to be worrying about, but I don't want
to cause any problems.)
To build the module and program, copy the sources and type "make" on a
Solaris machine. You can install them on a machine with "make
install", although I assume what you really want to do is add stuff to
"mkserv moira". (Otherwise the additions to /etc/rc2.d will be blown
away on the next update, and the addition you must make to
/etc/name_to_sysnum will be blown away by the update to the 8.1
release.) What needs to happen on a machine for this to work is:
* The module (uchown_mod) needs to be installed somewhere; I
recommend /kernel/sys/uchown.
* The userland program (uchown) needs to be installed
somewhere.
* /etc/name_to_sysnum needs an entry for "uchown" with the
number 201.
* You need to "modload /kernel/sys/uchown" at some point
before the userland program will work. The uchown.rc script
will handle this; the install target in the Makefile shows
how to install it in /etc/init.d/uchown and make symlinks in
/etc/rc0.d and /etc/rc2.d.
I've tested the kernel module and uchown program; I haven't tested the
uchown.rc script particularly, but it's really simple.
