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#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.

 */

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

/*

 * 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