[Bug 201498] tar cannot archive some files on ZFS with compression.

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=201498

            Bug ID: 201498
           Summary: tar cannot archive some files on ZFS with compression.
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: ki at hh.iij4u.or.jp

When I archive VirtualBox's VM directory on ZFS with compression,
tar seems to create incorrect archive.

I create plain Linux VM and archive on ZFS, but archive size is
very small and incorrect.

 % ls -l Linux/
 total 43
 -rw-------  1 kit  wheel        6883 Jul 12 21:11 Linux.vbox
 -rw-------  1 kit  wheel        6602 Jul 12 21:11 Linux.vbox-prev
 -rw-------  1 kit  wheel  8592031744 Jul 12 21:11 Linux.vdi
 % tar -cf Linux.tar Linux/
 a Linux
 a Linux/Linux.vdi
 a Linux/Linux.vbox
 a Linux/Linux.vbox-prev
 % ls -l Linux.tar
 -rw-r--r--  1 kit  wheel  280576 Jul 12 21:28 Linux.tar
 % tar tvf Linux.tar
 drwxr-xr-x  0 kit    wheel       0 Jul 12 21:11 Linux/
 -rw-------  0 kit    wheel 8592031744 Jul 12 21:11 Linux/Linux.vdi

I found GNU tar works fine, and bsdtar works correctly on UFS or
ZFS without compression.

I suppose that bsdtar uses compressed size to process, but I cannot
find what function has problem.

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