OpenAFS Master Repository branch, master, updated. openafs-devel-1_5_76-4569-gb9647ac

[Gerrit Code Review]

The following commit has been merged in the master branch:
commit b9647ac1062509d6a3997ca575ab1542d04677a2
Author: Andrew Deason <adeason@sinenomine.net>
Date:   Fri Jan 30 13:08:19 2015 -0600

    SOLARIS: Avoid uninitialized caller_context_t
    
    Currently we pass a caller_context_t* to some of Solaris' VFS
    functions (VOP_SETATTR, VOP_READ, VOP_WRITE, VOP_RWLOCK,
    VOP_RWUNLOCK), but the pointer we pass is to uninitialized memory.
    
    This code was added in commit 51d76681, and this particular argument
    is mentioned in
    <https://lists.openafs.org/pipermail/openafs-info/2004-March/012657.html>,
    where the author doesn't really know what the argument is for.
    
    Over 10 years later, it's still not obvious what this argument does,
    since I cannot find any documentation for it. However, browsing
    publicly-available Illumos/OpenSolaris source suggests this is used
    for things like non-blocking operations for network filesystems, and
    is only interpreted by certain filesystems in certain codepaths.
    
    In any case, it's clear that we're not supposed to be passing in an
    uninitialized structure, since the struct has actual members that are
    sometimes interpreted by lower levels. Other callers in
    Illumos/OpenSolaris source seem to just pass NULL here if they don't
    need any special behavior. So, just pass NULL.
    
    I am not aware of any issues caused by passing in this uninitialized
    struct, and browsing Illumos source and discussing the issue with
    Oracle engineers suggest there would currently not be any issues with
    the cache filesystems we would be using.
    
    However, it's always possible that issues could arise from this in the
    future, or there are issues we don't know about. Any such issues would
    almost certainly appear to be non-deterministic and be a nightmare to
    track down. So just pass NULL, to avoid the potential issues.
    
    Change-Id: I41babe520530ba886d1877de99eb1644c1b9f699
    Reviewed-on: http://gerrit.openafs.org/11704
    Reviewed-by: Perry Ruiter <pruiter@sinenomine.net>
    Tested-by: BuildBot <buildbot@rampaginggeek.com>
    Reviewed-by: Daria Brashear <shadow@your-file-system.com>

 src/afs/SOLARIS/osi_file.c     |    6 +-----
 src/afs/VNOPS/afs_vnop_read.c  |    9 +++------
 src/afs/VNOPS/afs_vnop_write.c |   10 +++-------
 3 files changed, 7 insertions(+), 18 deletions(-)

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