The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)

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FreeBSD/Linux Kernel Cross Reference

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    1 $FreeBSD$
    3                 Announcing the Availability of the
    4                         Coda Distributed
    5                            Filesystem
    6                               for
    7                          BSD Unix Systems
    9         Coda is a distributed filesystem like NFS and AFS.  It is
   10 freely available, like NFS.  But it functions much like AFS in being a
   11 "stateful" filesystem.  Coda and AFS cache files on your local
   12 machine to improve performance.  But Coda goes a step further than AFS
   13 by letting you access the cached files when there is no available
   14 network, viz. disconnected laptops and network outages.  In Coda, both
   15 the client and server are outside the kernel which makes them easier
   16 to experiment with.
   18 To get more information on Coda, I would like to refer people to
   20 There is a wealth of documents, papers, and theses there.  There is
   21 also a good introduction to the Coda File System in
   24 Coda was originally developed as an academic prototype/testbed.  It is
   25 being polished and rewritten where necessary.  Coda is a work in
   26 progress and does have bugs.  It is, though, very usable.  Our
   27 interest is in making Coda available to as many people as possible and
   28 to have Coda evolve and flourish.
   30 The bulk of the Coda filesystem code supports the Coda client
   31 program, the Coda server program and the utilities needed by both.
   32 All these programs are unix programs and can run equally well on any
   33 Unix platform.  Our main development thrust is improving these
   34 programs.  There is a small part of Coda that deals with the kernel to
   35 filesystem interface.  This code is OS specific (but should not be
   36 platform specific).
   38 Coda is currently available for several OS's and platforms:
   39         Freebsd-2.2.5: i386
   40         Freebsd-2.2.6: i386
   41         Freebsd -current: i386
   42         linux 2.0: i386 & sparc
   43         linux 2.1: i386 & sparc
   44         NetBSD 1.3: i386
   45         NetBSD -current: i386
   46 The relevant sources, binaries, and docs can be found in
   49 We intend to come out with new Coda releases often, not daily.  We
   50 don't want to slight any OS/platform not mentioned above.  We are just
   51 limited in our resources as to what we can support internally.  We
   52 will be happy to integrate OpenBSD support as well as other OS
   53 support.  Also, adding platform support should be relatively easy and
   54 we can discuss this.  The only difficulty is that Coda has a light weight
   55 process package.  It does some manipulations in assembler which would
   56 have to be redone for a different platform.
   58 There are several mailing lists that discuss coda:
   59 coda-announce and linux-coda.  We are going to revise linux-coda to be
   60 OS neutral, since it is mainly Coda we want to discuss.  We appreciate
   61 comments, feedback, bug reports, bug fixes, enhancements, etc.

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