1 files changed, 66 insertions, 0 deletions
diff --git a/include/linux/uio.h b/include/linux/uio.h
new file mode 100644
index 000000000000..9af8bbcd8963
--- /dev/null
+++ b/include/linux/uio.h
@@ -0,0 +1,66 @@
+#ifndef __LINUX_UIO_H
+#define __LINUX_UIO_H
+
+#include <linux/compiler.h>
+#include <linux/types.h>
+
+/*
+ *	Berkeley style UIO structures	-	Alan Cox 1994.
+ *
+ *		This program is free software; you can redistribute it and/or
+ *		modify it under the terms of the GNU General Public License
+ *		as published by the Free Software Foundation; either version
+ *		2 of the License, or (at your option) any later version.
+ */
+
+
+/* A word of warning: Our uio structure will clash with the C library one (which is now obsolete). Remove the C
+   library one from sys/uio.h if you have a very old library set */
+
+struct iovec
+{
+	void __user *iov_base;	/* BSD uses caddr_t (1003.1g requires void *) */
+	__kernel_size_t iov_len; /* Must be size_t (1003.1g) */
+};
+
+#ifdef __KERNEL__
+
+struct kvec {
+	void *iov_base; /* and that should *never* hold a userland pointer */
+	size_t iov_len;
+};
+
+#endif
+
+/*
+ *	UIO_MAXIOV shall be at least 16 1003.1g (5.4.1.1)
+ */
+ 
+#define UIO_FASTIOV	8
+#define UIO_MAXIOV	1024
+#if 0
+#define UIO_MAXIOV	16	/* Maximum iovec's in one operation 
+				   16 matches BSD */
+                                /* Beg pardon: BSD has 1024 --ANK */
+#endif
+
+/*
+ * Total number of bytes covered by an iovec.
+ *
+ * NOTE that it is not safe to use this function until all the iovec's
+ * segment lengths have been validated.  Because the individual lengths can
+ * overflow a size_t when added together.
+ */
+static inline size_t iov_length(const struct iovec *iov, unsigned long nr_segs)
+{
+	unsigned long seg;
+	size_t ret = 0;
+
+	for (seg = 0; seg < nr_segs; seg++)
+		ret += iov[seg].iov_len;
+	return ret;
+}
+
+unsigned long iov_shorten(struct iovec *iov, unsigned long nr_segs, size_t to);
+
+#endif