OpenAFS Master Repository branch, master, updated. BP-openafs-stable-1_8_x-636-gf9d20c6

[Gerrit Code Review]

The following commit has been merged in the master branch:
commit af73b9a3b1fc625694807287c0897391feaad52d
Author: Cheyenne Wills <cwills@sinenomine.net>
Date:   Thu Jul 2 13:39:27 2020 -0600

    LINUX: Don't panic on some file open errors
    
    Commit 'LINUX: Return NULL for afs_linux_raw_open error' (f6af4a155)
    updated afs_linux_raw_open to return NULL on some errors, but still
    panics if obtaining the dentry fails.
    
    Commit 'afs: Verify osi_UFSOpen worked' (c6b61a451) updated callers of
    osi_UFSOpen to verify whether or not the open was successful.  This
    meant osi_UFSOpen (and routines it calls) could pass back an error
    indication rather than panic when an error is encountered.
    
    Update afs_linux_raw_open to return a failure instead of panic if unable
    to obtain a dentry.
    
    Update osi_UFSOpen to return a NULL instead of panic if unable to obtain
    memory or fails to open the file. All callers of osi_UFSOpen handle a
    fail return, though some will still issue a panic.
    
    Update afs_linux_readpage_fastpath and afs_linux_readpages to not panic
    if afs_linux_raw_open fails.  Instead of panic, return an error.
    
    For testing, an error can be forced by removing a file from the
    cache directory.
    
    Note this work is based on a commit by pruiter@sinenomine.net
    
    Change-Id: Ic47e4868b4f81d99fbe3b2e4958778508ae4851f
    Reviewed-on: https://gerrit.openafs.org/14242
    Reviewed-by: Andrew Deason <adeason@sinenomine.net>
    Reviewed-by: Mark Vitale <mvitale@sinenomine.net>
    Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>
    Tested-by: BuildBot <buildbot@rampaginggeek.com>

 src/afs/LINUX/osi_file.c     |   15 +++++++++++----
 src/afs/LINUX/osi_vnodeops.c |   17 +++++++++++++----
 2 files changed, 24 insertions(+), 8 deletions(-)

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