test_os fails on FreeBSD 15 with zfs filesystem

[neek78]

Bug report

Bug description:

fallocate() fails with EOPNOTSUPP, rather than EINVAL on FreeBSD 15 with zfs.

 ======================================================================
    ERROR: test_posix_fallocate (test.test_os.test_posix.PosixTester.test_posix_fallocate)
    ----------------------------------------------------------------------
    Traceback (most recent call last):
      File "/home/nick/src/cpython-fixes/Lib/test/test_os/test_posix.py", line 409, in test_posix_fallocate
        posix.posix_fallocate(fd, 0, 10)
        ~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^
    OSError: [Errno 45] Operation not supported

CPython versions tested on:

CPython main branch

Operating systems tested on:

Other - FreeBSD

% uname -a
FreeBSD lappy-freebsd 15.0-RELEASE FreeBSD 15.0-RELEASE releng/15.0-n280995-7aedc8de6446 GENERIC arm64

Linked PRs

• gh-148841: Fix test_posix on FreeBSD 15 with zfs filesys #148844