Inside of `openat2`, we are assuming that if we are passed
`AT_SYMLINK_NOFOLLOW` that we are also passed a symlink. This is simply
not the case, as POSIX defines the flag to only have a noticable effect
if the resolved path is a symlink. Therefore, we cannot assume that we
have a symlink if we see `AT_SYMLINK_NOFOLLOW`. The previous behavior
caused an `EINVAL` in redoxfs because we do a consistency check to
error out if we are passed `O_SYMLINK` (which was added because
`AT_SYMLINK_NOFOLLOW` was observed) and aren't a symlink.
Hmm, maybe a special errno like `ENOTLNK` should be deployed for this? It's
specific enough that it could possibly be added to a future POSIX.
Connor-GH
76d801f7cd