OpenAFS Master Repository branch, master, updated. openafs-devel-1_9_0-129-g1bd6850

[Gerrit Code Review]

The following commit has been merged in the master branch:
commit 1bd68506be3243c5670aaf53798b2e4e715d4c8b
Author: Cheyenne Wills <cwills@sinenomine.net>
Date:   Fri Mar 5 16:31:03 2021 -0700

    Linux 5.12: Add user_namespace param to inode ops
    
    The Linux commits:
    "fs: make helpers idmap mount aware" (549c72977) and
    "attr: handle idmapped mounts" (2f221d6f7) that were merged into
    Linux-5.12-rc1 cause a build failure when creating the kernel module.
    
    Several functions within the inode_operations structure had their
    signature updated to include a user_namespace parameter.  This allows
    a filesystem to support idmapped mounts.
    
    OpenAFS only implements some of the changed functions.
    
       LINUX/vnodeops function inode_operation
       =====================   ===============
       afs_notify_change       setattr
       afs_linux_getattr       getattr
       afs_linux_create        create
       afs_linux_symlink       symlink
       afs_linux_mkdir         mkdir
       afs_linux_rename        rename
       afs_linux_permission    permission
    
    Update the autoconf tests to determine if the Linux kernel requires
    the user_namespace structure for inode_operations functions. If so,
    define a generic "IOP_TAKES_USER_NAMESPACE" macro.
    
    Update the above vnodeops functions to accept a 'struct user_namespace'
    parameter.
    
    When using the 'setattr_prepare' function a user namespace must be
    now provided. In order to provide compatibility as a non-idmapped mount
    filesystem the initial user namespace can be used. With OpenAFS, the
    initial user namespace obtained at kernel module load time is stored in
    a global variable 'afs_ns'.
    
    Update the call to setattr_prepare to pass the user namespace pointed
    to by the 'afs_ns' global variable.
    
    Update calls to setattr to pass the user namespace pointed to by
    the 'afs_ns' global variable.
    
    Notes:
    
    The changes introduced with Linux 5.12 allow a filesystem to support
    idmapped mounts if desired. This commit does not implement support for
    idmapped mounts, but will continue to use the same initial user
    namespace as prior to Linux 5.12.
    
    With Linux 5.12 the following autoconf checks fail:
    
     HAVE_LINUX_INODE_OPERATIONS_RENAME_TAKES_FLAGS
     HAVE_LINUX_SETATTR_PREPARE
     IOP_CREATE_TAKES_BOOL
     IOP_GETATTR_TAKES_PATH_STRUCT
     IOP_MKDIR_TAKES_UMODE_T
    
    The new macro 'IOP_TAKES_USER_NAMESPACE' covers the cases where these
    macros where used.
    
    Change-Id: Id450d5c716137340ed20af5531c0cd756e4435cd
    Reviewed-on: https://gerrit.openafs.org/14549
    Reviewed-by: Andrew Deason <adeason@sinenomine.net>
    Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>
    Tested-by: BuildBot <buildbot@rampaginggeek.com>

 src/afs/LINUX/osi_compat.h   |    8 ++++-
 src/afs/LINUX/osi_vnodeops.c |   69 ++++++++++++++++++++++++++++++++++++-----
 src/cf/linux-kernel-sig.m4   |   16 +++++++++-
 3 files changed, 81 insertions(+), 12 deletions(-)

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