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iostat.h revision 1.2 
      1 /*	$NetBSD: iostat.h,v 1.2 2006/04/20 12:13:53 blymn Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1996, 1997, 2004 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  * 3. All advertising materials mentioning features or use of this software
     20  *    must display the following acknowledgement:
     21  *	This product includes software developed by the NetBSD
     22  *	Foundation, Inc. and its contributors.
     23  * 4. Neither the name of The NetBSD Foundation nor the names of its
     24  *    contributors may be used to endorse or promote products derived
     25  *    from this software without specific prior written permission.
     26  *
     27  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     28  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     29  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     30  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     31  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     32  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     33  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     34  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     35  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     36  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     37  * POSSIBILITY OF SUCH DAMAGE.
     38  */
     39 
     40 #ifndef _SYS_IOSTAT_H_
     41 #define _SYS_IOSTAT_H_
     42 
     43 /*
     44  * Disk device structures.
     45  */
     46 
     47 #include <sys/time.h>
     48 #include <sys/queue.h>
     49 #include <sys/lock.h>
     50 
     51 #define	IOSTATNAMELEN	16
     52 
     53 /* types of drives we can have */
     54 #define IOSTAT_DISK	0
     55 #define IOSTAT_TAPE	1
     56 #define IOSTAT_NFS	2
     57 
     58 /* The following structure is 64-bit alignment safe */
     59 struct io_sysctl {
     60 	char		name[IOSTATNAMELEN];
     61 	int32_t		busy;
     62 	int32_t		type;
     63 	u_int64_t	xfer;
     64 	u_int64_t	seek;
     65 	u_int64_t	bytes;
     66 	u_int32_t	attachtime_sec;
     67 	u_int32_t	attachtime_usec;
     68 	u_int32_t	timestamp_sec;
     69 	u_int32_t	timestamp_usec;
     70 	u_int32_t	time_sec;
     71 	u_int32_t	time_usec;
     72 	/* New separate read/write stats */
     73 	u_int64_t	rxfer;
     74 	u_int64_t	rbytes;
     75 	u_int64_t	wxfer;
     76 	u_int64_t	wbytes;
     77 };
     78 
     79 /*
     80  * Structure for keeping the in-kernel drive stats - these are linked
     81  * together in drivelist.
     82  */
     83 
     84 struct io_stats
     85 {
     86 	char		*io_name;  /* device name */
     87 	void		*io_parent; /* pointer to what we are attached to */
     88 	int		io_type;   /* type of device the state belong to */
     89 	int		io_busy;	/* busy counter */
     90 	u_int64_t	io_rxfer;	/* total number of read transfers */
     91 	u_int64_t	io_wxfer;	/* total number of write transfers */
     92 	u_int64_t	io_seek;	/* total independent seek operations */
     93 	u_int64_t	io_rbytes;	/* total bytes read */
     94 	u_int64_t	io_wbytes;	/* total bytes written */
     95 	struct timeval	io_attachtime;	/* time disk was attached */
     96 	struct timeval	io_timestamp;	/* timestamp of last unbusy */
     97 	struct timeval	io_time;	/* total time spent busy */
     98 	TAILQ_ENTRY(io_stats) io_link;
     99 };
    100 
    101 /*
    102  * drivelist_head is defined here so that user-land has access to it.
    103  */
    104 TAILQ_HEAD(iostatlist_head, io_stats);	/* the iostatlist is a TAILQ */
    105 
    106 #ifdef _KERNEL
    107 void	iostat_busy(struct io_stats *);
    108 void	iostat_unbusy(struct io_stats *, long, int);
    109 struct	io_stats *iostat_find(char *);
    110 struct  io_stats *iostat_alloc(int32_t);
    111 void	iostat_free(struct io_stats *);
    112 void	iostat_seek(struct io_stats *);
    113 #endif
    114 
    115 #endif /* _SYS_IOSTAT_H_ */
    116