LCOM1920-T02G10

/*        $NetBSD: iostat.h,v 1.10 2009/04/04 07:30:09 ad Exp $        */

/*-

 * Copyright (c) 1996, 1997, 2004, 2009 The NetBSD Foundation, Inc.

 * All rights reserved.

 *

 * This code is derived from software contributed to The NetBSD Foundation

 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,

 * NASA Ames Research Center.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 *

 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS

 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED

 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS

 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

 * POSSIBILITY OF SUCH DAMAGE.

 */

#ifndef _SYS_IOSTAT_H_

#define _SYS_IOSTAT_H_

/*

 * Disk device structures.

 */

#include <sys/time.h>

#include <sys/queue.h>

#define        IOSTATNAMELEN        16

/* types of drives we can have */

#define IOSTAT_DISK        0

#define IOSTAT_TAPE        1

#define IOSTAT_NFS        2

/* The following structure is 64-bit alignment safe */

struct io_sysctl {

        char                name[IOSTATNAMELEN];

        int32_t                busy;

        int32_t                type;

        u_int64_t        xfer;

        u_int64_t        seek;

        u_int64_t        bytes;

        u_int32_t        attachtime_sec;

        u_int32_t        attachtime_usec;

        u_int32_t        timestamp_sec;

        u_int32_t        timestamp_usec;

        u_int32_t        time_sec;

        u_int32_t        time_usec;

        /* New separate read/write stats */

        u_int64_t        rxfer;

        u_int64_t        rbytes;

        u_int64_t        wxfer;

        u_int64_t        wbytes;

};

/*

 * Structure for keeping the in-kernel drive stats - these are linked

 * together in drivelist.

 */

struct io_stats {

        char                io_name[IOSTATNAMELEN];  /* device name */

        void                *io_parent; /* pointer to what we are attached to */

        int                io_type;   /* type of device the state belong to */

        int                io_busy;        /* busy counter */

        u_int64_t        io_rxfer;        /* total number of read transfers */

        u_int64_t        io_wxfer;        /* total number of write transfers */

        u_int64_t        io_seek;        /* total independent seek operations */

        u_int64_t        io_rbytes;        /* total bytes read */

        u_int64_t        io_wbytes;        /* total bytes written */

        struct timeval        io_attachtime;        /* time disk was attached */

        struct timeval        io_timestamp;        /* timestamp of last unbusy */

        struct timeval        io_time;        /* total time spent busy */

        TAILQ_ENTRY(io_stats) io_link;

};

/*

 * drivelist_head is defined here so that user-land has access to it.

 */

TAILQ_HEAD(iostatlist_head, io_stats);        /* the iostatlist is a TAILQ */

#ifdef _KERNEL

void        iostat_init(void);

void        iostat_busy(struct io_stats *);

void        iostat_unbusy(struct io_stats *, long, int);

bool        iostat_isbusy(struct io_stats *);

struct io_stats *iostat_find(const char *);

struct io_stats *iostat_alloc(int32_t, void *, const char *);

void        iostat_free(struct io_stats *);

void        iostat_seek(struct io_stats *);

#endif

#endif /* _SYS_IOSTAT_H_ */