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+/* $OpenBSD: disk.h,v 1.36 2017/05/04 22:47:27 deraadt Exp $ */
+/* $NetBSD: disk.h,v 1.11 1996/04/28 20:22:50 thorpej Exp $ */
+
+/*
+ * Copyright (c) 1995 Jason R. Thorpe. All rights reserved.
+ * Copyright (c) 1992, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This software was developed by the Computer Systems Engineering group
+ * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
+ * contributed to Berkeley.
+ *
+ * All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Lawrence Berkeley Laboratory.
+ *
+ * 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.
+ * 3. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
+ *
+ * from: Header: disk.h,v 1.5 92/11/19 04:33:03 torek Exp (LBL)
+ *
+ * @(#)disk.h 8.1 (Berkeley) 6/2/93
+ */
+
+/*
+ * Disk device structures.
+ */
+
+#include <sys/device.h>
+#include <sys/time.h>
+#include <sys/queue.h>
+#include <sys/rwlock.h>
+#include <sys/mutex.h>
+
+struct buf;
+struct disklabel;
+
+#define DS_DISKNAMELEN 16
+
+struct diskstats {
+ char ds_name[DS_DISKNAMELEN];
+ int ds_busy; /* busy counter */
+ u_int64_t ds_rxfer; /* total number of read transfers */
+ u_int64_t ds_wxfer; /* total number of write transfers */
+ u_int64_t ds_seek; /* total independent seek operations */
+ u_int64_t ds_rbytes; /* total bytes read */
+ u_int64_t ds_wbytes; /* total bytes written */
+ struct timeval ds_attachtime; /* time disk was attached */
+ struct timeval ds_timestamp; /* time of first busy or any unbusy */
+ struct timeval ds_time; /* total time spent busy */
+};
+
+struct disk {
+ TAILQ_ENTRY(disk) dk_link; /* link in global disklist */
+ struct rwlock dk_lock; /* disk lock */
+ struct mutex dk_mtx; /* busy/unbusy mtx */
+ char *dk_name; /* disk name */
+ struct device *dk_device; /* disk device structure. */
+ dev_t dk_devno; /* disk device number. */
+ int dk_flags; /* disk flags */
+#define DKF_CONSTRUCTED 0x0001
+#define DKF_OPENED 0x0002
+#define DKF_NOLABELREAD 0x0004
+#define DKF_LABELVALID 0x0008
+
+ /*
+ * Metrics data; note that some metrics may have no meaning
+ * on certain types of disks.
+ */
+ int dk_busy; /* busy counter */
+ u_int64_t dk_rxfer; /* total number of read transfers */
+ u_int64_t dk_wxfer; /* total number of write transfers */
+ u_int64_t dk_seek; /* total independent seek operations */
+ u_int64_t dk_rbytes; /* total bytes read */
+ u_int64_t dk_wbytes; /* total bytes written */
+ struct timeval dk_attachtime; /* time disk was attached */
+ struct timeval dk_timestamp; /* time of first busy or any unbusy */
+ struct timeval dk_time; /* total time spent busy */
+
+ int dk_bopenmask; /* block devices open */
+ int dk_copenmask; /* character devices open */
+ int dk_openmask; /* composite (bopen|copen) */
+ int dk_state; /* label state ### */
+ int dk_blkshift; /* shift to convert DEV_BSIZE to blks*/
+ int dk_byteshift; /* shift to convert bytes to blks */
+
+ /*
+ * Disk label information. Storage for the in-core disk label
+ * must be dynamically allocated, otherwise the size of this
+ * structure becomes machine-dependent.
+ */
+ struct disklabel *dk_label;
+};
+
+/* states */
+#define DK_CLOSED 0 /* drive is closed */
+#define DK_WANTOPEN 1 /* drive being opened */
+#define DK_WANTOPENRAW 2 /* drive being opened */
+#define DK_RDLABEL 3 /* label being read */
+#define DK_OPEN 4 /* label read, drive open */
+#define DK_OPENRAW 5 /* open without label */
+
+/* Disk map flags. */
+#define DM_OPENPART 0x1 /* Open raw partition. */
+#define DM_OPENBLCK 0x2 /* Open block device. */
+
+/*
+ * disklist_head is defined here so that user-land has access to it.
+ */
+TAILQ_HEAD(disklist_head, disk); /* the disklist is a TAILQ */
+
+#ifdef _KERNEL
+extern struct disklist_head disklist; /* list of disks attached to system */
+extern int disk_count; /* number of disks in global disklist */
+extern int disk_change; /* disk attached/detached */
+
+void disk_init(void);
+int disk_construct(struct disk *);
+void disk_attach(struct device *, struct disk *);
+void disk_detach(struct disk *);
+int disk_openpart(struct disk *, int, int, int);
+void disk_closepart(struct disk *, int, int);
+void disk_gone(int (*)(dev_t, int, int, struct proc *), int);
+void disk_busy(struct disk *);
+void disk_unbusy(struct disk *, long, daddr_t, int);
+
+int disk_lock(struct disk *);
+void disk_lock_nointr(struct disk *);
+void disk_unlock(struct disk *);
+struct device *disk_lookup(struct cfdriver *, int);
+
+char *disk_readlabel(struct disklabel *, dev_t, char *, size_t);
+
+int disk_map(char *, char *, int, int);
+
+int duid_iszero(u_char *);
+const char *duid_format(u_char *);
+#endif