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[Kyle Peterson <kyle.peterson1@xxxxxxxxx>]

Proposed kernel did fix the issue.

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https://bugs.launchpad.net/bugs/1574801

Title:
  zfs posix default permissions lost on reboot or unmount

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
  Fix Committed
Status in linux source package in Yakkety:
  Fix Released

Bug description:
  [SRU Justification][XENIAL]
  Commit 4967a3e introduced a typo that caused the ZPL to store the
  intended default ACL as an access ACL. Due to caching this problem
  may not become visible until the filesystem is remounted or the inode
  is evicted from the cache. 

  [FIX]
  https://github.com/zfsonlinux/zfs/commit/98f03691a4c08f38ca4538c468e9523f8e6b24be

  [TESTCASE]
  from https://github.com/zfsonlinux/zfs/issues/4520:

  [root@localhost ~]# cd /mnt/data/
  [root@localhost data]# mkdir test_dir
  [root@localhost data]# setfacl -R --mask -m u:uadm:rwX test_dir/
  [root@localhost data]# setfacl -R -d --mask -m u:uadm:rwX test_dir/
  [root@localhost data]# getfacl test_dir/
  # file: test_dir/
  # owner: root
  # group: root
  user::rwx
  user:uadm:rwx
  group::r-x
  mask::rwx
  other::r-x
  default:user::rwx
  default:user:uadm:rwx
  default:group::r-x
  default:mask::rwx
  default:other::r-x

  [root@localhost data]# reboot

  After a reboot without the fix one gets the following ACLs:

  [root@localhost ~]# cd /mnt/data/
  [root@localhost data]# getfacl test_dir/
  # file: test_dir/
  # owner: root
  # group: root
  user::rwx
  user:uadm:rwx
  group::r-x
  mask::rwx
  other::r-x

  With the fix:

  [root@localhost data]# getfacl test_dir/
  # file: test_dir/
  # owner: root
  # group: root
  user::rwx
  user:uadm:rwx
  group::r-x
  mask::rwx
  other::r-x
  default:user::rwx
  default:user:uadm:rwx
  default:group::r-x
  default:mask::rwx
  default:other::r-x

  [REGRESSION POTENTAL]
  Minimal ZFS only and touches just acl setting. This corrects just the ACL_TYPE_DEFAULT case for the ACL setting for ZFS, and sets it to the *correct* name. It is a trivial one line fix.

  ----------------------------------------------

  Ubuntu 16.04 server

  Problem: Posix default permissions on zfs datasets are lost after
  rebooting the server or unmounting/remount.

  See here for details and fix:
  https://github.com/zfsonlinux/zfs/issues/4520

  ---
  AlsaDevices:
   total 0
   crw-rw----+ 1 root audio 116,  1 Apr 24 22:44 seq
   crw-rw----+ 1 root audio 116, 33 Apr 24 22:44 timer
  AplayDevices: Error: [Errno 2] No such file or directory
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  DistroRelease: Ubuntu 16.04
  HibernationDevice: RESUME=/dev/mapper/ubuntu--vg-swap_1
  IwConfig: Error: [Errno 2] No such file or directory
  MachineType: To be filled by O.E.M. To be filled by O.E.M.
  NonfreeKernelModules: zfs zunicode zcommon znvpair zavl
  Package: linux (not installed)
  PciMultimedia:

  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB:
   0 nouveaufb
   1 astdrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-21-generic root=/dev/mapper/hostname--vg-root ro
  ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-21-generic N/A
   linux-backports-modules-4.4.0-21-generic  N/A
   linux-firmware                            1.157
  RfKill: Error: [Errno 2] No such file or directory
  Tags:  xenial
  Uname: Linux 4.4.0-21-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:

  _MarkForUpload: True
  dmi.bios.date: 07/23/2013
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 6702
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: P8B-X series
  dmi.board.vendor: ASUSTeK Computer INC.
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 17
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr6702:bd07/23/2013:svnTobefilledbyO.E.M.:pnTobefilledbyO.E.M.:pvrTobefilledbyO.E.M.:rvnASUSTeKComputerINC.:rnP8B-Xseries:rvr:cvnToBeFilledByO.E.M.:ct17:cvrToBeFilledByO.E.M.:
  dmi.product.name: To be filled by O.E.M.
  dmi.product.version: To be filled by O.E.M.
  dmi.sys.vendor: To be filled by O.E.M.

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