[OpenAFS-win32-devel] IMPORTANT: Byte Range Locking Installers available

[Jeffrey Altman]

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Starting today a new set of installers built off of the 1_4_x branch
including support for the Byte Range Locking code are now available for
testing.   These installers are the first release on the road to 1.4.1.
They can be found at:

  http://web.mit.edu/user/j/a/jaltman/Public/OpenAFS/ByteRangeLocks/
  \\afs\athena.mit.edu\user\j\a\jaltman\Public/OpenAFS\ByteRangeLocks\
  /afs/athena.mit.edu/user/j/a/jaltman/Public/OpenAFS/ByteRangeLocks/

As a user of these builds you are going to notice some fairly
significant changes in behavior.   Windows relies on a mandatory locking
model whereas AFS relies on an advisory locking model.   Windows
applications in most cases attempt to obtain a lock or check to see if
there is a lock when opening files.   Windows itself always checks for
locks when attempting to execute files.   One of the side effects is
that if a user attempts to execute/open a file in a non-readonly volume
from a directory in which they do not have locking 'k' privileges, the
attempt to open the file is going to fail with an "access denied" error.

Organizations that wish to allow "system:anyuser" or "system:authuser"
to execute applications must add the 'k' privilege to all directories
containing publicly available files.  A failure to do so will result in
significant numbers of support calls as end users are inconvenienced by
"access denied" errors.

This change is going to be a major backward compatibility issue and I
am not entirely sure how we are going to get the word out prior to the
release of 1.4.1.

Jeffrey Altman






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