geom_disk.c revision 93776
1/*- 2 * Copyright (c) 2002 Poul-Henning Kamp 3 * Copyright (c) 2002 Networks Associates Technology, Inc. 4 * All rights reserved. 5 * 6 * This software was developed for the FreeBSD Project by Poul-Henning Kamp 7 * and NAI Labs, the Security Research Division of Network Associates, Inc. 8 * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the 9 * DARPA CHATS research program. 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. The names of the authors may not be used to endorse or promote 20 * products derived from this software without specific prior written 21 * permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * $FreeBSD: head/sys/geom/geom_disk.c 93776 2002-04-04 09:54:13Z phk $ 36 */ 37 38#include "opt_geom.h" 39 40#include <sys/param.h> 41#include <sys/systm.h> 42#include <sys/kernel.h> 43#include <sys/sysctl.h> 44#include <sys/bio.h> 45#include <sys/conf.h> 46#include <sys/disk.h> 47#include <sys/malloc.h> 48#include <sys/sysctl.h> 49#include <machine/md_var.h> 50#include <sys/ctype.h> 51 52 53#include <sys/lock.h> 54#include <sys/mutex.h> 55#include <geom/geom.h> 56 57static g_access_t g_disk_access; 58 59struct g_class g_disk_class = { 60 "DISK-class", 61 NULL, 62 NULL, 63 G_CLASS_INITSTUFF 64}; 65 66static int 67g_disk_access(struct g_provider *pp, int r, int w, int e) 68{ 69 struct disk *dp; 70 dev_t dev; 71 int error; 72 73 g_trace(G_T_ACCESS, "g_disk_access(%s, %d, %d, %d)", 74 pp->name, r, w, e); 75 g_topology_assert(); 76 r += pp->acr; 77 w += pp->acw; 78 e += pp->ace; 79 dp = pp->geom->softc; 80 dev = dp->d_dev; 81 if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) { 82 mtx_lock(&Giant); 83 error = devsw(dev)->d_open(dev, 3, 0, NULL); 84 if (error != 0) 85 printf("Opened disk %s -> %d\n", pp->name, error); 86 mtx_unlock(&Giant); 87 } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) { 88 mtx_lock(&Giant); 89 error = devsw(dev)->d_close(dev, 3, 0, NULL); 90 if (error != 0) 91 printf("Closed disk %s -> %d\n", pp->name, error); 92 mtx_unlock(&Giant); 93 } else { 94 error = 0; 95 } 96 return (error); 97} 98 99static void 100g_disk_done(struct bio *bp) 101{ 102 103 mtx_unlock(&Giant); 104 bp->bio_completed = bp->bio_length - bp->bio_resid; 105 g_std_done(bp); 106 mtx_lock(&Giant); 107} 108 109static void 110g_disk_start(struct bio *bp) 111{ 112 struct bio *bp2; 113 dev_t dev; 114 struct disk *dp; 115 struct g_ioctl *gio; 116 int error; 117 118 dp = bp->bio_to->geom->softc; 119 dev = dp->d_dev; 120 error = 0; 121 switch(bp->bio_cmd) { 122 case BIO_READ: 123 case BIO_WRITE: 124 bp2 = g_clone_bio(bp); 125 bp2->bio_done = g_disk_done; 126 bp2->bio_blkno = bp2->bio_offset >> DEV_BSHIFT; 127 bp2->bio_pblkno = bp2->bio_blkno; 128 bp2->bio_bcount = bp2->bio_length; 129 bp2->bio_dev = dev; 130 mtx_lock(&Giant); 131 devsw(dev)->d_strategy(bp2); 132 mtx_unlock(&Giant); 133 break; 134 case BIO_GETATTR: 135 if (g_haveattr_int(bp, "GEOM::sectorsize", 136 dp->d_label.d_secsize)) 137 break; 138 else if (g_haveattr_int(bp, "GEOM::fwsectors", 139 dp->d_label.d_nsectors)) 140 break; 141 else if (g_haveattr_int(bp, "GEOM::fwheads", 142 dp->d_label.d_ntracks)) 143 break; 144 else if (g_haveattr_int(bp, "GEOM::fwcylinders", 145 dp->d_label.d_ncylinders)) 146 break; 147 else if (g_haveattr_off_t(bp, "GEOM::mediasize", 148 dp->d_label.d_secsize * (off_t)dp->d_label.d_secperunit)) 149 break; 150 else if (!strcmp(bp->bio_attribute, "GEOM::ioctl") && 151 bp->bio_length == sizeof *gio) { 152 gio = (struct g_ioctl *)bp->bio_data; 153 mtx_lock(&Giant); 154 error = devsw(dev)->d_ioctl(dev, gio->cmd, 155 gio->data, gio->fflag, gio->td); 156 mtx_unlock(&Giant); 157 } else 158 error = ENOIOCTL; 159 break; 160 default: 161 error = EOPNOTSUPP; 162 break; 163 } 164 if (error) { 165 bp->bio_error = error; 166 g_io_deliver(bp); 167 } 168 return; 169} 170 171dev_t 172disk_create(int unit, struct disk *dp, int flags, struct cdevsw *cdevsw, struct cdevsw *proto) 173{ 174 static int once; 175 struct g_geom *gp; 176 struct g_provider *pp; 177 dev_t dev; 178 179 mtx_unlock(&Giant); 180 if (!once) { 181 g_add_class(&g_disk_class); 182 once++; 183 } 184 dev = g_malloc(sizeof *dev, M_WAITOK | M_ZERO); 185 dp->d_dev = dev; 186 dp->d_devsw = cdevsw; 187 dev->si_devsw = cdevsw; 188 dev->si_disk = dp; 189 dev->si_udev = dkmakeminor(unit, WHOLE_DISK_SLICE, RAW_PART); 190 g_topology_lock(); 191 gp = g_new_geomf(&g_disk_class, "%s%d", cdevsw->d_name, unit); 192 gp->start = g_disk_start; 193 gp->access = g_disk_access; 194 gp->softc = dp; 195 dp->d_softc = gp; 196 pp = g_new_providerf(gp, "%s", gp->name); 197 g_error_provider(pp, 0); 198 g_topology_unlock(); 199 mtx_lock(&Giant); 200 return (dev); 201} 202 203void disk_dev_synth(dev_t dev); 204 205void 206disk_dev_synth(dev_t dev) 207{ 208 209 return; 210} 211 212void 213disk_destroy(dev_t dev) 214{ 215 struct disk *dp; 216 struct g_geom *gp; 217 218 dp = dev->si_disk; 219 gp = dp->d_softc; 220 g_free(dev); 221 gp->flags |= G_GEOM_WITHER; 222 g_orphan_provider(LIST_FIRST(&gp->provider), ENXIO); 223} 224 225void 226disk_invalidate (struct disk *disk) 227{ 228} 229 230 231SYSCTL_INT(_debug_sizeof, OID_AUTO, disklabel, CTLFLAG_RD, 232 0, sizeof(struct disklabel), "sizeof(struct disklabel)"); 233 234SYSCTL_INT(_debug_sizeof, OID_AUTO, diskslices, CTLFLAG_RD, 235 0, sizeof(struct diskslices), "sizeof(struct diskslices)"); 236 237SYSCTL_INT(_debug_sizeof, OID_AUTO, disk, CTLFLAG_RD, 238 0, sizeof(struct disk), "sizeof(struct disk)"); 239