common/include/sys/iostat.h

   1 /*      $NetBSD: iostat.h,v 1.10 2009/04/04 07:30:09 ad Exp $   */
   2
   3 /*-
   4  * Copyright (c) 1996, 1997, 2004, 2009 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
   9  * NASA Ames Research Center.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  21  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  22  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  23  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  24  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  30  * POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 #ifndef _SYS_IOSTAT_H_
  34 #define _SYS_IOSTAT_H_
  35
  36 /*
  37  * Disk device structures.
  38  */
  39
  40 #include <sys/time.h>
  41 #include <sys/queue.h>
  42
  43 #define IOSTATNAMELEN   16
  44
  45 /* types of drives we can have */
  46 #define IOSTAT_DISK     0
  47 #define IOSTAT_TAPE     1
  48 #define IOSTAT_NFS      2
  49
  50 /* The following structure is 64-bit alignment safe */
  51 struct io_sysctl {
  52         char            name[IOSTATNAMELEN];
  53         int32_t         busy;
  54         int32_t         type;
  55         u_int64_t       xfer;
  56         u_int64_t       seek;
  57         u_int64_t       bytes;
  58         u_int32_t       attachtime_sec;
  59         u_int32_t       attachtime_usec;
  60         u_int32_t       timestamp_sec;
  61         u_int32_t       timestamp_usec;
  62         u_int32_t       time_sec;
  63         u_int32_t       time_usec;
  64         /* New separate read/write stats */
  65         u_int64_t       rxfer;
  66         u_int64_t       rbytes;
  67         u_int64_t       wxfer;
  68         u_int64_t       wbytes;
  69 };
  70
  71 /*
  72  * Structure for keeping the in-kernel drive stats - these are linked
  73  * together in drivelist.
  74  */
  75
  76 struct io_stats {
  77         char            io_name[IOSTATNAMELEN];  /* device name */
  78         void            *io_parent; /* pointer to what we are attached to */
  79         int             io_type;   /* type of device the state belong to */
  80         int             io_busy;        /* busy counter */
  81         u_int64_t       io_rxfer;       /* total number of read transfers */
  82         u_int64_t       io_wxfer;       /* total number of write transfers */
  83         u_int64_t       io_seek;        /* total independent seek operations */
  84         u_int64_t       io_rbytes;      /* total bytes read */
  85         u_int64_t       io_wbytes;      /* total bytes written */
  86         struct timeval  io_attachtime;  /* time disk was attached */
  87         struct timeval  io_timestamp;   /* timestamp of last unbusy */
  88         struct timeval  io_time;        /* total time spent busy */
  89         TAILQ_ENTRY(io_stats) io_link;
  90 };
  91
  92 /*
  93  * drivelist_head is defined here so that user-land has access to it.
  94  */
  95 TAILQ_HEAD(iostatlist_head, io_stats);  /* the iostatlist is a TAILQ */
  96
  97 #ifdef _KERNEL
  98 void    iostat_init(void);
  99 void    iostat_busy(struct io_stats *);
 100 void    iostat_unbusy(struct io_stats *, long, int);
 101 bool    iostat_isbusy(struct io_stats *);
 102 struct io_stats *iostat_find(const char *);
 103 struct io_stats *iostat_alloc(int32_t, void *, const char *);
 104 void    iostat_free(struct io_stats *);
 105 void    iostat_seek(struct io_stats *);
 106 #endif
 107
 108 #endif /* _SYS_IOSTAT_H_ */