[PATCH] VFS cleanup - remove chmod_acl and fchmod_acl

[Jeremy Allison]

On Thu, May 17, 2018 at 02:37:15PM -0700, Jeremy Allison wrote:
> Hi all,
> 
> After a conversation with Volker, I realized it's
> time (for 4.9.0) to remove the hideous VFS
> calls SMB_VFS_CHMOD_ACL() and SMB_VFS_FCHMOD_ACL().
> 
> They exist because I utterly misunderstood the
> meaning of the ACL_MASK ace entry in POSIX
> ACLs when I was first writing an ACL backend
> for Samba.
> 
> I assumed that for ACL mapping from Windows
> we would always have to set the ACL_MASK to
> "rwx", so hand-implemented the copying of
> u/g/o bits on a mode change to individual
> ACE entries in a POSIX ACL (see the code
> in chmod_acl_internals() in source3/smbd/posix_acls.c
> for details).
> 
> This is just silly - doing a [f]chmod
> implements exactly the same effect
> by changing the mask bits (and is
> correctly read and applied in canonicalise_acl(),
> also in source3/smbd/posix_acls.c).
> 
> So this patchset removes the two
> VFS calls SMB_VFS_CHMOD_ACL() and SMB_VFS_FCHMOD_ACL()
> and replaces their use with simple SMB_VFS_CHMOD()
> and SMB_VFS_FCHMOD() instead.
> 
> This change should only be visible to
> unix extensions POSIX clients doing
> direct chmod and posix ACL get/set calls,
> and it will cause Samba to be closer
> to expected POSIX behavior.

Ha, don't push yet ! It seems to have
found a bug in the torture_samba3_hide()
test (which does do direct POSIX chmod
calls :-). I think that bug was hidden
before this patchset (and that's why
the samba3checkfsp test was being
marked flakey, a dead file is being
left behind that should be there... :-).

More when I've figured out the problem
with the test :-).

Jeremy.