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Date:      Tue, 9 Apr 2013 13:16:32 -0600
From:      "Kenneth D. Merry" <ken@FreeBSD.org>
To:        Pawel Jakub Dawidek <pjd@FreeBSD.org>
Cc:        arch@FreeBSD.org, fs@FreeBSD.org
Subject:   Re: patches to add new stat(2) file flags
Message-ID:  <20130409191632.GA4480@nargothrond.kdm.org>
In-Reply-To: <20130314232449.GC1446@garage.freebsd.pl>
References:  <20130307000533.GA38950@nargothrond.kdm.org> <20130307214649.X981@besplex.bde.org> <20130314232449.GC1446@garage.freebsd.pl>

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On Fri, Mar 15, 2013 at 00:24:50 +0100, Pawel Jakub Dawidek wrote:
> 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.

Do we know whether the change to disable enforcement of the ZFS readonly
attribute actually went into Illumos?

I'm fine with creating a new flag, say UF_READONLY, and mapping it to a
disabled ZFS readonly attribute.  We can let the CIFS servers enforce it,
as Gordon Ross proposed for the Illumos CIFS server.

Ken
-- 
Kenneth Merry
ken@FreeBSD.ORG



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