Change sendfile() to use the new m_ext callback scheme for cleaning up after
[dragonfly.git] / sys / sys / ccdvar.h
CommitLineData
984263bc 1/* $FreeBSD: src/sys/sys/ccdvar.h,v 1.11.2.1 2001/09/11 09:49:54 kris Exp $ */
1de703da 2/* $DragonFly: src/sys/sys/ccdvar.h,v 1.2 2003/06/17 04:28:58 dillon Exp $ */
984263bc
MD
3
4/* $NetBSD: ccdvar.h,v 1.7.2.1 1995/10/12 21:30:18 thorpej Exp $ */
5
6/*
7 * Copyright (c) 1995 Jason R. Thorpe.
8 * All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed for the NetBSD Project
21 * by Jason R. Thorpe.
22 * 4. The name of the author may not be used to endorse or promote products
23 * derived from this software without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
26 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
27 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
28 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
29 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
30 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
31 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
32 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
33 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 */
37
38/*
39 * Copyright (c) 1988 University of Utah.
40 * Copyright (c) 1990, 1993
41 * The Regents of the University of California. All rights reserved.
42 *
43 * This code is derived from software contributed to Berkeley by
44 * the Systems Programming Group of the University of Utah Computer
45 * Science Department.
46 *
47 * Redistribution and use in source and binary forms, with or without
48 * modification, are permitted provided that the following conditions
49 * are met:
50 * 1. Redistributions of source code must retain the above copyright
51 * notice, this list of conditions and the following disclaimer.
52 * 2. Redistributions in binary form must reproduce the above copyright
53 * notice, this list of conditions and the following disclaimer in the
54 * documentation and/or other materials provided with the distribution.
55 * 3. All advertising materials mentioning features or use of this software
56 * must display the following acknowledgement:
57 * This product includes software developed by the University of
58 * California, Berkeley and its contributors.
59 * 4. Neither the name of the University nor the names of its contributors
60 * may be used to endorse or promote products derived from this software
61 * without specific prior written permission.
62 *
63 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
64 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
65 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
66 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
67 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
68 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
69 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
70 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
71 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
72 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
73 * SUCH DAMAGE.
74 *
75 * from: Utah $Hdr: cdvar.h 1.1 90/07/09$
76 *
77 * @(#)cdvar.h 8.1 (Berkeley) 6/10/93
78 */
79
80/*
81 * Dynamic configuration and disklabel support by:
82 * Jason R. Thorpe <thorpej@nas.nasa.gov>
83 * Numerical Aerodynamic Simulation Facility
84 * Mail Stop 258-6
85 * NASA Ames Research Center
86 * Moffett Field, CA 94035
87 */
88
89/*
90 * A concatenated disk is described at initialization time by this structure.
91 */
92struct ccddevice {
93 int ccd_unit; /* logical unit of this ccd */
94 int ccd_interleave; /* interleave (DEV_BSIZE blocks) */
95 int ccd_flags; /* misc. information */
96 int ccd_dk; /* disk number */
97 struct vnode **ccd_vpp; /* array of component vnodes */
98 char **ccd_cpp; /* array of component pathnames */
99 int ccd_ndev; /* number of component devices */
100};
101
102/*
103 * This structure is used to configure a ccd via ioctl(2).
104 */
105struct ccd_ioctl {
106 char **ccio_disks; /* pointer to component paths */
107 u_int ccio_ndisks; /* number of disks to concatenate */
108 int ccio_ileave; /* interleave (DEV_BSIZE blocks) */
109 int ccio_flags; /* misc. information */
110 int ccio_unit; /* unit number: use varies */
111 size_t ccio_size; /* (returned) size of ccd */
112};
113
114/* ccd_flags */
115#define CCDF_SWAP 0x01 /* interleave should be dmmax */
116#define CCDF_UNIFORM 0x02 /* use LCCD of sizes for uniform interleave */
117#define CCDF_MIRROR 0x04 /* use mirroring */
118#define CCDF_PARITY 0x08 /* use parity (RAID level 5) */
119
120/* Mask of user-settable ccd flags. */
121#define CCDF_USERMASK (CCDF_SWAP|CCDF_UNIFORM|CCDF_MIRROR|CCDF_PARITY)
122
123/*
124 * Component info table.
125 * Describes a single component of a concatenated disk.
126 */
127struct ccdcinfo {
128 struct vnode *ci_vp; /* device's vnode */
129 dev_t ci_dev; /* XXX: device's dev_t */
130 size_t ci_size; /* size */
131 char *ci_path; /* path to component */
132 size_t ci_pathlen; /* length of component path */
133};
134
135/*
136 * Interleave description table.
137 * Computed at boot time to speed irregular-interleave lookups.
138 * The idea is that we interleave in "groups". First we interleave
139 * evenly over all component disks up to the size of the smallest
140 * component (the first group), then we interleave evenly over all
141 * remaining disks up to the size of the next-smallest (second group),
142 * and so on.
143 *
144 * Each table entry describes the interleave characteristics of one
145 * of these groups. For example if a concatenated disk consisted of
146 * three components of 5, 3, and 7 DEV_BSIZE blocks interleaved at
147 * DEV_BSIZE (1), the table would have three entries:
148 *
149 * ndisk startblk startoff dev
150 * 3 0 0 0, 1, 2
151 * 2 9 3 0, 2
152 * 1 13 5 2
153 * 0 - - -
154 *
155 * which says that the first nine blocks (0-8) are interleaved over
156 * 3 disks (0, 1, 2) starting at block offset 0 on any component disk,
157 * the next 4 blocks (9-12) are interleaved over 2 disks (0, 2) starting
158 * at component block 3, and the remaining blocks (13-14) are on disk
159 * 2 starting at offset 5.
160 */
161struct ccdiinfo {
162 int ii_ndisk; /* # of disks range is interleaved over */
163 daddr_t ii_startblk; /* starting scaled block # for range */
164 daddr_t ii_startoff; /* starting component offset (block #) */
165 int *ii_index; /* ordered list of components in range */
166};
167
168/*
169 * Concatenated disk pseudo-geometry information.
170 */
171struct ccdgeom {
172 u_int32_t ccg_secsize; /* # bytes per sector */
173 u_int32_t ccg_nsectors; /* # data sectors per track */
174 u_int32_t ccg_ntracks; /* # tracks per cylinder */
175 u_int32_t ccg_ncylinders; /* # cylinders per unit */
176};
177
178/*
179 * A concatenated disk is described after initialization by this structure.
180 */
181struct ccd_softc {
182 int sc_unit; /* logical unit number */
183 int sc_flags; /* flags */
184 int sc_cflags; /* configuration flags */
185 size_t sc_size; /* size of ccd */
186 int sc_ileave; /* interleave */
187 u_int sc_nccdisks; /* number of components */
188#define CCD_MAXNDISKS 65536
189 struct ccdcinfo *sc_cinfo; /* component info */
190 struct ccdiinfo *sc_itable; /* interleave table */
191 struct devstat device_stats; /* device statistics */
192 struct ccdgeom sc_geom; /* pseudo geometry info */
193 struct disklabel sc_label; /* generic disk device info */
194 int sc_openmask;
195 int sc_pick; /* side of mirror picked */
196 daddr_t sc_blk[2]; /* mirror localization */
197};
198
199/* sc_flags */
200#define CCDF_INITED 0x01 /* unit has been initialized */
201#define CCDF_WLABEL 0x02 /* label area is writable */
202#define CCDF_LABELLING 0x04 /* unit is currently being labelled */
203#define CCDF_WANTED 0x40 /* someone is waiting to obtain a lock */
204#define CCDF_LOCKED 0x80 /* unit is locked */
205
206/*
207 * Before you can use a unit, it must be configured with CCDIOCSET.
208 * The configuration persists across opens and closes of the device;
209 * a CCDIOCCLR must be used to reset a configuration. An attempt to
210 * CCDIOCSET an already active unit will return EBUSY. Attempts to
211 * CCDIOCCLR an inactive unit will return ENXIO.
212 */
213#define CCDIOCSET _IOWR('F', 16, struct ccd_ioctl) /* enable ccd */
214#define CCDIOCCLR _IOW('F', 17, struct ccd_ioctl) /* disable ccd */