patches to add new stat(2) file flags

[Pawel Jakub Dawidek]

On Thu, Mar 07, 2013 at 10:21:38PM +1100, Bruce Evans wrote:
> On Wed, 6 Mar 2013, Kenneth D. Merry wrote:
> 
> > I have attached diffs against head for some additional stat(2) file flags.
> >
> > The primary purpose of these flags is to improve compatibility with CIFS,
> > both from the client and the server side.
> > ...
> > 	UF_IMMUTABLE:	Command line name: "uchg", "uimmutable"
> > 			ZFS name: XAT_READONLY, ZFS_READONLY
> > 			Windows: FILE_ATTRIBUTE_READONLY
> >
> > 			This flag means that the file may not be modified.
> > 			This is not a new flag, but where applicable it is
> > 			mapped to the Windows readonly bit.  ZFS and UFS
> > 			now both support the flag and enforce it.
> >
> > 			The behavior of this flag is compatible with MacOS X.
> 
> This is incompatible with mapping the DOS read-only attribute to the
> non-writeable file permission in msdosfs.  msdosfs does this mainly to
> get at least one useful file permission, but the semantics are subtly
> different from all of file permissions, UF_IMMUTABLE and SF_IMMUTABLE.
> I think it should be a new flag.

I agree, especially that I saw some discussion recently on Illumos
mailing lists to not enforce this flag in ZFS, which would be confusing
to FreeBSD users if we forget to _not_ merge that change.

-- 
Pawel Jakub Dawidek                       http://www.wheelsystems.com
FreeBSD committer                         http://www.FreeBSD.org
Am I Evil? Yes, I Am!                     http://tupytaj.pl
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