[Bug 1310792] Re: dfree command is not working anymore in samba

[Peter de Kraker]

My workaround for now is to allow zfs module access to all users from the zfs group, instead of only root.
This way the zfs command can be run by by users from that group. 

/etc/udev/rules.d/91-zfs-permissions.rules
#Use this to add a group and more permissive permissions for zfs
#so that you don't always need run it as root.  beware, users not root
#can do nearly EVERYTHING, including, but not limited to destroying
#volumes and deleting datasets.  they CANNOT mount datasets or create new
#volumes, export datasets via NFS, or other things that require root
#permissions outside of ZFS.
ACTION=="add", KERNEL=="zfs", MODE="0660", GROUP="zfs"

Note that you need to add the zfs group and add the users to it. This is
also a bit risky, because every user of that group can now modify zfs
stuff. (But on your own homeserver this is not really a problem)

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https://bugs.launchpad.net/bugs/1310792

Title:
  dfree command is not working anymore in samba

Status in “samba” package in Ubuntu:
  New

Bug description:
  I have a ZFS On Linux setup as my main backup/fileserver that uses
  RaidZ1 (similar to raid 5: 3 disks, 1 parity).  Because Linux doesn't
  show the free space correctly for the complete disk/mount point, the
  disk space indicator on my Windows machine for this share gives the
  wrong info. The solution in Samba 3 / Ubuntu 13.10 was to add a "dfree
  command = scriptname" configuration option to smb.cnf that knew how to
  figure out the correct disk space/usage. This was all working and the
  total disk space was displayed correctly in Windows Explorer on the
  client.

  However, now after upgrading to 14.04, the diskspace suddenly gets
  displayed all wrong again.  I checked the script (it worked ok) and
  even let it output "0 0" to see if it actually gets called by samba,
  but nothing changed on the indicator of my windows machine. I did
  reboots of the server, and the client, and nothing changed. I also
  changed the "dfree command" to a invalid scriptname, and moved it from
  global to a share section. Nothing worked.

  Testparm gives no errors, so it looks like samba somehow just ignores
  this parameter. Manpage for smb.conf shows that the "dfree command"
  option is available.

  Looks like a regression to me, and is frustrating, because I can't see
  how much space I am using on my fileserver.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: samba 2:4.1.6+dfsg-1ubuntu2
  ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
  Uname: Linux 3.13.0-24-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl zcommon znvpair
  ApportVersion: 2.14.1-0ubuntu3
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Mon Apr 21 22:43:53 2014
  InstallationDate: Installed on 2013-09-29 (204 days ago)
  InstallationMedia: Ubuntu-Server 13.04 "Raring Ringtail" - Release amd64 (20130423.1)
  NmbdLog:
   
  OtherFailedConnect: Yes
  SambaServerRegression: Yes
  SmbConfIncluded: Yes
  SourcePackage: samba
  UpgradeStatus: Upgraded to trusty on 2014-04-21 (0 days ago)

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