iov_iter: sanity checks for copy to/from page primitives
for now - just that we don't attempt to cross out of compound page
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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for now - just that we don't attempt to cross out of compound page
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>