[Bug 194117] libprocstat incorrectly extracts some ZFS information

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=194117

--- Comment #1 from commit-hook at freebsd.org ---
A commit references this bug:

Author: avg
Date: Fri May 22 11:20:25 UTC 2020
New revision: 361363
URL: https://svnweb.freebsd.org/changeset/base/361363

Log:
  libprocstat: fix ZFS support

  First of all, znode_phys_t hasn't been used for storing file attributes
  for a long time now.  Modern ZFS versions use a System Attribute table
  with a flexible layout.  But more importantly all the required
  information is available in znode_t itself.

  It's not easy to include zfs_znode.h in userland without breaking code
  because the most interesting parts of the header are kernel-only. And
  hardcoding field offsets is too fragile.  So, I created a new
  compilation unit that includes zfs_znode.h using some mild kludges to
  get it and its dependencies to compile in userland.  The compilation
  unit exports interesting field offsets and does not have any other code.

  PR:           194117
  Reviewed by:  markj
  MFC after:    2 weeks
  Sponsored by: Panzura
  Differential Revision: https://reviews.freebsd.org/D24941

Changes:
  head/lib/libprocstat/Makefile
  head/lib/libprocstat/zfs/Makefile
  head/lib/libprocstat/zfs.c
  head/lib/libprocstat/zfs_defs.c
  head/lib/libprocstat/zfs_defs.h

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