2 * Copyright (c) 2007 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
17 * 3. Neither the name of The DragonFly Project nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * Virtual CDROM driver
39 #include <sys/types.h>
40 #include <sys/param.h>
41 #include <sys/systm.h>
42 #include <sys/kernel.h>
43 #include <sys/malloc.h>
46 #include <sys/devicestat.h>
48 #include <machine/md_var.h>
56 struct bio_queue_head bio_queue;
64 static d_strategy_t vcdstrategy;
65 static d_open_t vcdopen;
67 static struct dev_ops vcd_ops = {
73 .d_strategy = vcdstrategy,
77 vcdinit(void *dummy __unused)
79 struct vkdisk_info *dsk;
84 for (i = 0; i < DiskNum; i++) {
85 /* check that the 'bus device' has been initialized */
87 if (dsk == NULL || dsk->type != VKD_CD)
89 if (dsk->fd < 0 || fstat(dsk->fd, &st) < 0)
92 /* and create a new device */
93 sc = kmalloc(sizeof(*sc), M_DEVBUF, M_WAITOK | M_ZERO);
96 bioq_init(&sc->bio_queue);
97 devstat_add_entry(&sc->stats, "vcd", sc->unit, 2048,
98 DEVSTAT_NO_ORDERED_TAGS,
99 DEVSTAT_TYPE_DIRECT | DEVSTAT_TYPE_IF_OTHER,
100 DEVSTAT_PRIORITY_DISK);
101 sc->dev = disk_create(sc->unit, &sc->disk, &vcd_ops);
102 sc->dev->si_drv1 = sc;
103 sc->dev->si_iosize_max = 256 * 1024;
107 SYSINIT(vcdisk, SI_SUB_DRIVERS, SI_ORDER_FIRST, vcdinit, NULL);
110 vcdopen(struct dev_open_args *ap)
112 struct vcd_softc *sc;
113 struct disk_info info;
117 dev = ap->a_head.a_dev;
119 if (fstat(sc->fd, &st) < 0 || st.st_size == 0)
122 bzero(&info, sizeof(info));
123 info.d_media_blksize = 2048;
124 info.d_media_blocks = st.st_size / info.d_media_blksize;
125 info.d_dsflags = DSO_ONESLICE | DSO_COMPATLABEL | DSO_COMPATPARTA |
128 info.d_ncylinders = 1;
129 info.d_secpertrack = info.d_media_blocks;
130 info.d_secpercyl = info.d_secpertrack * info.d_nheads;
132 disk_setdiskinfo(&sc->disk, &info);
137 vcdstrategy(struct dev_strategy_args *ap)
139 struct bio *bio = ap->a_bio;
141 struct vcd_softc *sc;
145 dev = ap->a_head.a_dev;
148 bioqdisksort(&sc->bio_queue, bio);
149 while ((bio = bioq_first(&sc->bio_queue)) != NULL) {
150 bioq_remove(&sc->bio_queue, bio);
153 devstat_start_transaction(&sc->stats);
157 n = pread(sc->fd, bp->b_data,
158 bp->b_bcount, bio->bio_offset);
161 /* XXX HANDLE SHORT WRITE XXX */
162 n = pwrite(sc->fd, bp->b_data,
163 bp->b_bcount, bio->bio_offset);
166 panic("vcd: bad b_cmd %d", bp->b_cmd);
167 break; /* not reached */
169 if (n != bp->b_bcount) {
171 bp->b_flags |= B_ERROR;
174 bp->b_resid = bp->b_bcount - n;
175 devstat_end_transaction_buf(&sc->stats, bp);