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In mainline, by the commit
	549c7297717c3 2021-01-24 fs: make helpers idmap mount aware
and its series, a new parameter 'user_ns' was added to some inode
operations.  Aufs simply follows it, but it is still testing.
Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>

SELinux's d_instantiate hook calls __vfs_getxattr() BEFORE d_inode is
set.  Aufs should not rely upon d_inode and should use the parameter
inode instead.
Reported-by: "jon bird" <news@onasticksoftware.co.uk>
Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>
(cherry picked from commit 5777718fd657e1cfdf006cd16b524c65cf2fe09b)

Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>
(cherry picked from commit 56b4b776c84f364384971c4cdfd66b4a2f0696d4)

Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>

Support for XATTR and ACL including several branch attributes to ignore
the copy error around XATTR and ACL.

NFS always sets MS_POSIXACL regardless its mount option 'noacl.'
When MS_POSIXACL is set, generic_permission() calls check_acl() (via
acl_permission_check()) and gets -EOPNOTSUPP because the NFS branch is
mounted as 'noacl.'
In aufs, h_permission() should not call generic_permission() in this
case.
The similar thing happens in coping-up XATTR. vfs_getxattr_alloc()
returns -EOPNOTSUPP.

See also the document in this commit.
Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>