[Bug 194117] New: libprocstat incorrectly extracts some ZFS information

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

            Bug ID: 194117
           Summary: libprocstat incorrectly extracts some ZFS information
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: Needs Triage
          Severity: Affects Many People
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: avg at FreeBSD.org

lib/libprocstat/zfs.c uses old ZFS znode_t layout that is not compatible with
what is currently in kernel when it extracts vn_mode and vn_size.  In
particular, the code assumes that znode_t contains a pointer to a znode_phys_t
object, which is not the case.

I think that the required information can be extracted from z_size and z_mode
fields in znode_t.

While here, there is a comment in zfs_filestat() that talks about two byte
offsets, while in reality the offsets are 2 * sizeof(pointer), e.g. 16 bytes on
64-bit systems.  The code itself is correct.

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