Date: Tue, 15 Sep 2009 15:18:41 -0700 (PDT) From: Nate Eldredge <nate@thatsmathematics.com> To: Giulio Ferro <auryn@zirakzigil.org> Cc: freebsd-hackers@freebsd.org Subject: Re: ZFS group ownership Message-ID: <Pine.GSO.4.64.0909151507080.8152@zeno.ucsd.edu> In-Reply-To: <4AAB8AD0.5010302@zirakzigil.org> References: <4AAB8AD0.5010302@zirakzigil.org>
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On Sat, 12 Sep 2009, Giulio Ferro wrote: > I don't know if this is the correct list to discuss this matter, if not > I apologize in advance. freebsd-questions might have been better, but I don't think you're too far off. It wasn't necessary to post three times though :) [On UFS, files are created with the same group as the directory that contains them. On ZFS, they are created with the primary group of the user who creates them.] > What I ask now is: is this a bug or a feature? Both, I think :) The behavior you describe on UFS (group comes from the directory) is standard for BSD-based systems like FreeBSD. On SysV-based systems, however, the default is that the group comes from the user, as you describe on ZFS. ZFS was originally developed for Solaris, a descendent of SysV, so it's not surprising that it also has this behavior. However, this is at least a documentation bug, since the open(2) man page describes the BSD behavior without mentioning exceptions. > How can I achieve my goal in ZFS, that is allowing members of the same > group to operate with the files / dirs they create? On SysV, you can get BSD-type behavior by setting the sgid bit on the directory in question, e.g. "chmod g+s dir". Then new files will inherit their group from the directory. I suspect this will work on FreeBSD/ZFS too even though "chmod g+s" on a directory is undocumented. -- Nate Eldredge nate@thatsmathematics.com
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