userfaultfd: uapi: fix UFFDIO_CONTINUE ioctl request definition
This ioctl request reads from uffdio_continue structure written by userspace which justifies _IOC_WRITE flag. It also writes back to that structure which justifies _IOC_READ flag. See NOTEs in include/uapi/asm-generic/ioctl.h for more information. Fixes: f6191471 ("userfaultfd: add UFFDIO_CONTINUE ioctl") Signed-off-by: NGleb Fotengauer-Malinovskiy <glebfm@altlinux.org> Acked-by: NPeter Xu <peterx@redhat.com> Reviewed-by: NAxel Rasmussen <axelrasmussen@google.com> Reviewed-by: NDmitry V. Levin <ldv@altlinux.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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