kill iov_shorten()

Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

fs/read_write.c

@@ -634,27 +634,6 @@ SYSCALL_DEFINE4(pwrite64, unsigned int, fd, const char __user *, buf,
 	return ret;
 }
 
-/*
- * Reduce an iovec's length in-place.  Return the resulting number of segments
- */
-unsigned long iov_shorten(struct iovec *iov, unsigned long nr_segs, size_t to)
-{
-	unsigned long seg = 0;
-	size_t len = 0;
-
-	while (seg < nr_segs) {
-		seg++;
-		if (len + iov->iov_len >= to) {
-			iov->iov_len = to - len;
-			break;
-		}
-		len += iov->iov_len;
-		iov++;
-	}
-	return seg;
-}
-EXPORT_SYMBOL(iov_shorten);
-
 static ssize_t do_iter_readv_writev(struct file *filp, struct iov_iter *iter,
 		loff_t *ppos, int type, rwf_t flags)
 {

include/linux/uio.h

@@ -80,8 +80,6 @@ static inline struct iovec iov_iter_iovec(const struct iov_iter *iter)
 	     ((iov = iov_iter_iovec(&(iter))), 1);		\
 	     iov_iter_advance(&(iter), (iov).iov_len))
 
-unsigned long iov_shorten(struct iovec *iov, unsigned long nr_segs, size_t to);
-
 size_t iov_iter_copy_from_user_atomic(struct page *page,
 		struct iov_iter *i, unsigned long offset, size_t bytes);
 void iov_iter_advance(struct iov_iter *i, size_t bytes);