[Bug 253500] fusefs: F_SETLKW fcntl gets corrupted by kern_fcntl()

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253500

--- Comment #2 from Alan Somers <asomers at FreeBSD.org> ---
Kib's right.  The VOP_ADVLOCK interface isn't exactly the same as fcntl.  It's
not legal for op to be F_SETLKW.  Instead, it should be F_SETLK and the flags
field should contain F_WAIT.  You can fix this in fuse_vnop_advlock .  The
second problem is also likely caused by fuse_vnop_advlock, but I don't have
time to debug it right now.

If you're planning to submit a fix, could you please also fix and/or extend the
tests in tests/sys/fs/fusefs/locks.cc ?

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