[Support/UNIX] posix_fallocate() can fail with EINVAL.
According to the docs on opegroup.org, the function can return
EINVAL if:
The len argument is less than zero, or the offset argument is less
than zero, or the underlying file system does not support this
operation.
I'd say it's a peculiar choice (when EONOTSUPP is right there), but
let's keep POSIX happy for now. This was independently discovered
by Mark Millard (on FreeBSD/ZFS).
Quickly ack'ed by Rui on IRC.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317535
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