[Bug 1893010] Re: qemu linux-user doesn't support OFD fcntl locks

[Mike Gelfand]

The attached patch fixes the issue for me.

** Patch added: "qemu-5.0.0-ofd-fcntl.patch"
   
https://bugs.launchpad.net/qemu/+bug/1893010/+attachment/5405131/+files/qemu-5.0.0-ofd-fcntl.patch

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https://bugs.launchpad.net/bugs/1893010

Title:
  qemu linux-user doesn't support OFD fcntl locks

Status in QEMU:
  New

Bug description:
  "Open file description locks (non-POSIX)", as they are described in
  fcntl(2) man page, aren't supported by qemu-user  and attempting to
  use those results in EINVAL. I'm on Gentoo with latest QEMU version
  currently available (5.0.0-r2), and trying to emulate ppc64 and s390x
  on x86_64.

  Looking at linux-user/syscall.c, I'm guessing the issue is in (at
  least) `target_to_host_fcntl_cmd` where switch reaches the default
  clause as there're no cases for F_OFD_SETLK / F_OFD_SETLKW /
  F_OFD_GETLK.

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