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1c65d98672
readv() and writev() should _not_ ignore all but the first ->iov_len, among other things. Really weird abuse of those syscalls - it expects a vector element per channel, with identical lengths (it actually assumes them to be identical - no checking is done). readv() and writev() are really bad match for that. Unfortunately, userland API is userland API and we can't do anything about them. Converted to ->read_iter/->write_iter. Please, _please_ don't do anything of that kind when designing new interfaces. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>