chflags (uappnd) on ZFS

[Jeremy Chadwick]

On Tue, Feb 08, 2011 at 10:18:55AM +0100, Damien Fleuriot wrote:
> Getting the very same error on 8.2-RC3 amd64
> 
> FreeBSD mybsd 8.2-RC3 FreeBSD 8.2-RC3 #1: Thu Feb  3 11:03:48 CET 2011
>    root at mybsd:/usr/obj/usr/src/sys/DAM  amd64
> 
> mybsd# zpool get version data
> NAME  PROPERTY  VALUE    SOURCE
> data  version   15       default
> 
> mybsd# zfs get version
> NAME  PROPERTY  VALUE    SOURCE
> data  version   4
> 
> 
> On 2/7/11 8:52 PM, Michael wrote:
> > Hello,
> > 
> > Is uappnd flag supported on ZFS? I'm using 8.1-R and when I try to:
> >   chflags uappnd file.txt
> > then I get:
> >   chflags: file.txt: Operation not supported

It looks like the implemented/translated chflags(2) bits are:

SF_IMMUTABLE ("chflags schg")    <-->  ZFS_IMMUTABLE
SF_APPEND    ("chflags sappnd")  <-->  ZFS_APPENDONLY
SF_NOUNLINK  ("chflags sunlnk")  <-->  ZFS_NOUNLINK
UF_NODUMP    ("chflags nodump")  <-->  ZFS_NODUMP

This is based on "grep -r FLAG_CHANGE /usr/src/sys/cddl", and reading
src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/zfs_znode.h.  I
assume that one can use the inverse operations (clearing bits) as well.

Please see the chflags(2) man page (don't skim please) for details of
what the difference is between SF_xxx and UF_xxx flags.

-- 
| Jeremy Chadwick                                   jdc at parodius.com |
| Parodius Networking                       http://www.parodius.com/ |
| UNIX Systems Administrator                  Mountain View, CA, USA |
| Making life hard for others since 1977.               PGP 4BD6C0CB |