2 * Copyright (c) 2006 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
34 * $DragonFly: src/sys/dev/virtual/disk/vdisk.c,v 1.3 2007/03/16 13:41:40 swildner Exp $
40 #include <sys/types.h>
41 #include <sys/param.h>
42 #include <sys/systm.h>
43 #include <sys/kernel.h>
44 #include <sys/malloc.h>
47 #include <sys/devicestat.h>
48 #include <sys/disklabel.h>
50 #include <machine/md_var.h>
58 struct bio_queue_head bio_queue;
68 static d_strategy_t vkdstrategy;
69 static d_open_t vkdopen;
71 static struct dev_ops vkd_ops = {
72 { "vkd", CDEV_MAJOR, D_DISK },
77 .d_strategy = vkdstrategy,
81 vkdinit(void *dummy __unused)
83 struct vkdisk_info *dsk;
88 KASSERT(DiskNum <= VKDISK_MAX, ("too many disks: %d\n", DiskNum));
90 for (i = 0; i < DiskNum; i++) {
92 /* check that the 'bus device' has been initialized */
96 if (dsk->fd < 0 || fstat(dsk->fd, &st) < 0)
99 /* and create a new device */
100 sc = kmalloc(sizeof(*sc), M_DEVBUF, M_WAITOK | M_ZERO);
101 sc->unit = dsk->unit;
103 bioq_init(&sc->bio_queue);
104 devstat_add_entry(&sc->stats, "vkd", sc->unit, DEV_BSIZE,
105 DEVSTAT_NO_ORDERED_TAGS,
106 DEVSTAT_TYPE_DIRECT | DEVSTAT_TYPE_IF_OTHER,
107 DEVSTAT_PRIORITY_DISK);
108 sc->dev = disk_create(sc->unit, &sc->disk, 0, &vkd_ops);
109 sc->dev->si_drv1 = sc;
110 sc->dev->si_iosize_max = 256 * 1024;
113 dl = &sc->disk.d_label;
114 bzero(dl, sizeof(*dl));
115 dl->d_secsize = DEV_BSIZE;
116 dl->d_nsectors = st.st_size / dl->d_secsize;
118 dl->d_secpercyl = dl->d_nsectors;
119 dl->d_ncylinders = 1;
125 SYSINIT(vkdisk, SI_SUB_DRIVERS, SI_ORDER_FIRST, vkdinit, NULL);
128 vkdopen(struct dev_open_args *ap)
130 struct vkd_softc *sc;
131 struct disklabel *dl;
135 dev = ap->a_head.a_dev;
137 if (fstat(sc->fd, &st) < 0 || st.st_size == 0)
140 dl = &sc->disk.d_label;
141 bzero(dl, sizeof(*dl));
142 dl->d_secsize = DEV_BSIZE;
143 dl->d_nsectors = st.st_size / dl->d_secsize;
145 dl->d_secpercyl = dl->d_nsectors;
146 dl->d_ncylinders = 1;
147 dl->d_secperunit = dl->d_nsectors;
152 vkdstrategy(struct dev_strategy_args *ap)
154 struct bio *bio = ap->a_bio;
156 struct vkd_softc *sc;
160 dev = ap->a_head.a_dev;
163 bioqdisksort(&sc->bio_queue, bio);
164 while ((bio = bioq_first(&sc->bio_queue)) != NULL) {
165 bioq_remove(&sc->bio_queue, bio);
168 devstat_start_transaction(&sc->stats);
172 lseek(sc->fd, bio->bio_offset, 0);
173 n = read(sc->fd, bp->b_data, bp->b_bcount);
176 /* XXX HANDLE SHORT WRITE XXX */
177 lseek(sc->fd, bio->bio_offset, 0);
178 n = write(sc->fd, bp->b_data, bp->b_bcount);
181 panic("vkd: bad b_cmd %d", bp->b_cmd);
182 break; /* not reached */
184 if (n != bp->b_bcount) {
186 bp->b_flags |= B_ERROR;
189 bp->b_resid = bp->b_bcount - n;
190 devstat_end_transaction_buf(&sc->stats, bp);