[Bug 238197] [FUSEFS] fusefs supports neither chflags(2) not stat.st_birthtim

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=238197

            Bug ID: 238197
           Summary: [FUSEFS] fusefs supports neither chflags(2) not
                    stat.st_birthtim
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: asomers at FreeBSD.org

Created attachment 204675
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=204675&action=edit
Add st_birthtime support to FUSEFS backwards-incompatibly

The FUSE protocol does not support chflags(2) at all, and the FUSE_GETATTR and
FUSE_SETATTR messages have no fields for st_birthtime.  This is a direct result
of its Linux-only origins.  OSXFuse extended the protocol to add those features
(and others), but they had to fork libfuse to do it.  FreeBSD has thus far had
a policy of no changes to libfuse.  Even if we were to abandon that policy, we
can't add chflags and st_birthtime support without bumping the FUSE kernel API
version past the most recently published version in libfuse.  The reason is
because libfuse includes its own copy of the kernel API header.  Changing the
FUSE protocol without reving the kernel API past what is already published by
libfuse would thus break existing binaries.

Attached is a patch that adds st_birthtime support to fusefs(5).  However, it
adds it at protocol version 7.9, so it breaks compatibility with existing
binaries.  The patch also includes some OSX definitions.  I thought that
including them would make it easier to update libfuse.

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