OpenAFS Master Repository branch, master, updated. BP-openafs-stable-1_8_x-400-g397199a

[Gerrit Code Review]

The following commit has been merged in the master branch:
commit 397199a1992d74d8b7e693a2d76df836f7a70080
Author: Andrew Deason <adeason@sinenomine.net>
Date:   Tue Aug 14 15:53:20 2018 -0500

    afs: Add AFS_USPC_SHUTDOWN bkg request
    
    When AFS_NEW_BKG was added, the kernel module indicated to the
    relevant afsd process that it's time to shutdown by returning -2. This
    works on DARWIN, but it's difficult to make this work on all
    platforms, because of the different way that platforms handle error
    codes from our pioctls and other AFS syscalls.
    
    Specifically, on LINUX, negative error codes are assumed to be
    negative errno codes, and so returning -2 from the syscall handler
    means we return -1 to userspace, with errno set to 2 (ENOENT).
    
    Getting this to work consistently across platforms is probably more
    trouble than its worth, so instead of relying on specific return codes
    from the syscall, just add a new background daemon operation called
    AFS_USPC_SHUTDOWN, which just tells the background daemon to exit.
    
    Change-Id: I00b245c8f734dc9e49d6b4268cd0f6a4f1896894
    Reviewed-on: https://gerrit.openafs.org/13281
    Tested-by: BuildBot <buildbot@rampaginggeek.com>
    Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>

 src/afs/afs_daemons.c |    4 +++-
 src/afsd/afsd.c       |   15 +++++++++++++--
 src/config/afs_args.h |    1 +
 3 files changed, 17 insertions(+), 3 deletions(-)

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