FreeBSD/Linux Kernel Cross Reference
sys/sys/iostat.h

     /*      $NetBSD: iostat.h,v 1.9.10.1 2009/04/04 17:49:21 snj 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_ */

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