freebsd-skq

History

iedowse dafd513732 Change the second argument of vflush() to an integer that specifies the number of references on the filesystem root vnode to be both expected and released. Many filesystems hold an extra reference on the filesystem root vnode, which must be accounted for when determining if the filesystem is busy and then released if it isn't busy. The old `skipvp' approach required individual filesystem xxx_unmount functions to re-implement much of vflush()'s logic to deal with the root vnode. All 9 filesystems that hold an extra reference on the root vnode got the logic wrong in the case of forced unmounts, so `umount -f' would always fail if there were any extra root vnode references. Fix this issue centrally in vflush(), now that we can. This commit also fixes a vnode reference leak in devfs, which could result in idle devfs filesystems that refuse to unmount. Reviewed by: phk, bp		2001-05-16 18:04:37 +00:00
..
00READ	Update	1998-10-28 19:39:12 +00:00
cnode.h	$Id$ -> $FreeBSD$	1999-08-28 01:08:13 +00:00
coda_fbsd.c	Implement vop_std{get\|put}pages() and add them to the default vop[].	2001-05-01 08:34:45 +00:00
coda_io.h	$Id$ -> $FreeBSD$	1999-08-28 01:08:13 +00:00
coda_kernel.h	$Id$ -> $FreeBSD$	1999-08-28 01:08:13 +00:00
coda_namecache.c	Undo part of the tangle of having sys/lock.h and sys/mutex.h included in	2001-05-01 08:13:21 +00:00
coda_namecache.h	$Id$ -> $FreeBSD$	1999-08-28 01:08:13 +00:00
coda_opstats.h	$Id$ -> $FreeBSD$	1999-08-28 01:08:13 +00:00
coda_pioctl.h	$Id$ -> $FreeBSD$	1999-08-28 01:08:13 +00:00
coda_psdev.c	Undo part of the tangle of having sys/lock.h and sys/mutex.h included in	2001-05-01 08:13:21 +00:00
coda_psdev.h	$Id$ -> $FreeBSD$	1999-08-28 01:08:13 +00:00
coda_subr.c	Undo part of the tangle of having sys/lock.h and sys/mutex.h included in	2001-05-01 08:13:21 +00:00
coda_subr.h	$Id$ -> $FreeBSD$	1999-08-28 01:08:13 +00:00
coda_venus.c	Undo part of the tangle of having sys/lock.h and sys/mutex.h included in	2001-05-01 08:13:21 +00:00
coda_venus.h	$Id$ -> $FreeBSD$	1999-08-28 01:08:13 +00:00
coda_vfsops.c	Change the second argument of vflush() to an integer that specifies	2001-05-16 18:04:37 +00:00
coda_vfsops.h	Forward-declare struct mbuf so that this file is less self-insufficient	2000-10-05 11:58:22 +00:00
coda_vnops.c	Implement vop_std{get\|put}pages() and add them to the default vop[].	2001-05-01 08:34:45 +00:00
coda_vnops.h	Implement vop_std{get\|put}pages() and add them to the default vop[].	2001-05-01 08:34:45 +00:00
coda.h	Change #ifdef KERNEL to #ifdef _KERNEL in the public headers. "KERNEL"	1999-12-29 05:07:58 +00:00
README	Pass2 complete	1998-09-02 19:09:53 +00:00
TODO	Pass2 complete	1998-09-02 19:09:53 +00:00

README

                Announcing the Availability of the
                        Coda Distributed
                           Filesystem
                              for
                         BSD Unix Systems

        Coda is a distributed file system like NFS and AFS.  It is
freely available, like NFS.  But it functions much like AFS in being a
"stateful" file system.  Coda and AFS cache files on your local
machine to improve performance.  But Coda goes a step further than AFS
by letting you access the cached files when there is no available
network, viz. disconnected laptops and network outages.  In Coda, both
the client and server are outside the kernel which makes them easier
to experiment with.

To get more information on Coda, I would like to refer people to
        http://www.coda.cs.cmu.edu
There is a wealth of documents, papers, and theses there.  There is
also a good introduction to the Coda File System in
        http://www.coda.cs.cmu.edu/ljpaper/lj.html

Coda was originally developed as an academic prototype/testbed.  It is
being polished and rewritten where necessary.  Coda is a work in
progress and does have bugs.  It is, though, very usable.  Our
interest is in making Coda available to as many people as possible and
to have Coda evolve and flourish.

The bulk of the Coda file system code supports the Coda client
program, the Coda server program and the utilities needed by both.
All these programs are unix programs and can run equally well on any
Unix platform.  Our main development thrust is improving these
programs.  There is a small part of Coda that deals with the kernel to
file system interface.  This code is OS specific (but should not be
platform specific).

Coda is currently available for several OS's and platforms:
        Freebsd-2.2.5: i386
        Freebsd-2.2.6: i386
	Freebsd -current: i386
        linux 2.0: i386 & sparc
        linux 2.1: i386 & sparc
        NetBSD 1.3: i386
	NetBSD -current: i386
The relevant sources, binaries, and docs can be found in
        ftp://ftp.coda.cs.cmu.edu/pub/coda/

We intend to come out with new Coda releases often, not daily.  We
don't want to slight any OS/platform not mentioned above.  We are just
limited in our resources as to what we can support internally.  We
will be happy to integrate OpenBSD support as well as other OS
support.  Also, adding platform support should be relatively easy and
we can discuss this.  The only difficulty is that Coda has a light weight
process package.  It does some manipulations in assembler which would
have to be redone for a different platform.

There are several mailing lists @coda.cs.cmu.edu that discuss coda:
coda-announce and linux-coda.  We are going to revise linux-coda to be
OS neutral, since it is mainly Coda we want to discuss.  We appreciate
comments, feedback, bug reports, bug fixes, enhancements, etc.