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AFS Techologies Workshop

OpenAFS Newsletter, Issue 1, May 2009

This is the first issue of what will hopefully be a monthly summary of the activity that's happening in the OpenAFS community.

As always, volunteers, patches, bug reports, or any other type of help is greatly appreciated.

Feedback on this newsletter is welcome. The goal is to summarize the various development efforts and news of OpenAFS for the community. Please let Jason know what you would like to see out of this newsletter.

Upcoming Events

The Sixth Annual International AFS & Kerberos Best Practices Workshop will be held at Stanford University on June 1-5, 2009.



Disconnected AFS support

Project Contacts:

Support for disconnection operation on Unix has been integrated into the 1.5.x branch. There are no currently known data loss bugs, and further testing would be greatly appreciated. Currently, files written whilst disconnected do not persist across restarts, and there is no user interface to specify which files should be pinned in the cache to ensure they're available whilst disconnected. Simon Wilkinson and Dragos Tatulea (respectively) are working to resolve these.

Security Releases

Security Officer:

OpenAFS 1.4.9, 1.4.10 and 1.5.59 were a security release to resolve two independent issues in the OpenAFS cache manager for Unix, one of which is a potential remote root exploit. All Unix platforms, excluding Mac OS X 10.4 and 10.5 are affected, and upgrading is strongly recommended.

Fedora 11 and Linux 2.6.29 support

Project Contact:

OpenAFS 1.4.10 does not build on Fedora 11, and crashes in some situations when running on a 2.6.29 kernel. Fixes will be available shortly.


Project Contact:

Derrick Brashear, Jason Edgecombe, Jeff Altman, and Simon Wilkinson discussed the issue of keeping the community better informed by the web and a monthly email newsletter. Jason volunteered to write the newsletter. This document is the result.


Google Summer of Code 2009

OpenAFS received 4 slots for the 2009 Google Summer of Code.

Go to for more information about the GSoC projects.

The student projects are:

OpenAFS server preference based on network conditions

Student Developer: Jake Thebault-Spieker <>

Mentor: Derrick Brashear <>

This is Jake's second year with GSoC for OpenAFS.


The OpenAFS cache manager keeps two lists of which servers host the files required. Currently, these lists are ordered based on antiquated network architecture assumptions that no longer apply to current network architectures. This project seeks to change the way these lists are ordered by taking into account network conditions that can be estimated based on the Rx peer statistics gathering functionality built into OpenAFS.


OpenAFS Management Console on Windows

Student Developer: Brant Gurganus <>

Mentor: Jeffrey Altman <>


I propose creating a Microsoft Management Console snap-in for Windows. This will better integrate OpenAFS with existing Windows management technology and fits in an overall strategy of improved Windows integration.


Implementing OpenAFS features into RedHat's kafs kernel module.

Student Developer: Wang Lei <>

Mentor: David Howells


My project is to implement some OpenAFS features into the Linux kafs kernel module. The first feature is DNS AFSDB Support which may be implemented by sharing the mechanism used by CIFS as my mentor's design at present. The second is implement more functions of the pioctl system-call on the work of the student of GSoC last year. And the other two are to implement some OpenAFS fs commonds that were not implemented in kafs and Keyring compatibility which can work well with both OpenAFS client and kafs. I have began to read the documatations of pioctl/ioctl of the OpenAFS, and I will start my work with the implement of this system call. There are a lot of pioctls to implement and I think that can help me to understand OpenAFS well.


Adding Searching and Indexing Searching Features

Student Developer: Reeni Kaushik <>

Mentor: Dave Botsch


My interest lies in the area of File Systems and I am especially interested in working on the project ``AFS as a Data Driven File System''.


Kerberos v5 and multiple encryption types

Project Contacts:

We are finalizing work to bring the rxk5 change set to parity with openafs-devel-1_5_x, at which time we will pull the rxk5-devel and probably rxk5 branch tags forward. (This may take place in the next day or so, in fact, thanks to a bunch of merge work by Marcus over the weekend.) Our intention is to have rxk5 ready to merge with 1.5 in the near future. In addition, we are working on a draft description of 'rxk5ng', a superset of rxk5 addressing authorization of currently unsecured call channels (anonymous file accesses, callbacks), cache poisoning, and departmental servers. --Matt

(Ed: This was received on May 10)

*BSD Support

Project Contacts:

The OpenBSD port has been updated to support OpenBSD 4.4 and 4.5. I have added a userland port (no client) to DragonflyBSD, supporting releases 2.2 and 2.3. Updates for client support of recent versions of FreeBSD 8.0 current and NetBSD 4.x and 5.x are in progress. --Matt

Extended Callback Information

Project Contacts:

I am preparing a public release of the full extended callback information draft implementation, including a reduced version of Tom Keiser's libosi work. (The xcb mechanism makes the callback interface extensible, and provides atop this new notifications including range invalidation on files and metadata change notifications.) This will be ready for review some time before the afsbpw. --Matt

Rx OSD integration

Project Contacts:

Felix Frank is working on integrating the Rx OSD changes back into the mainline OpenAFS code.


Better Documentation

Project Contacts:

Marcus Watts updated the pts_interactive.pod, pts_sleep.pod, pts_source.pod, and NoAuth.pod man pages in the rxk5 branch on May 3. Jason clarified fake address support in netinfo.pod on April 27. Jason has started working on the Admin Quickstart guide. The man pages still need work, but Jason is tired of seeing new users set up OpenAFS with the deprecated kaserver. Appendix A of the Unix Quickstart Guide has been rewritten to show the use of configure and make to compile OpenAFS from source.

CVS statistics

  Month     Lines Added     Lines Removed  Net Lines Changed
  2009/01   +    1289     -    1128           161
  2009/02   +    2274     -    2152           122
  2009/03   +    4276     -    4466          -190
  2009/04   +     394     -     361            33

  2009/01   +    5794     -    7476         -1682
  2009/02   +  133623     -  128267          5356
  2009/03   +    8252     -    7838           414
  2009/04   +    1145     -     777           368

  2009/01   +     389     -     251           138
  2009/02   +     869     -     612           257
  2009/03   +    1503     -     710           793
  2009/04   +     544     -     436           108

  2009/01   +     247     -     177            70
  2009/02   +    1959     -    1135           824
  2009/03   +     316     -      74           242

  none in 2009 until May 2009