geom_disk.c revision 93248
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 93248 2002-03-26 21:40:06Z 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 g_disk_access, 63 NULL, 64 NULL, 65 { 0, 0 }, 66 { 0 } 67}; 68 69static int 70g_disk_access(struct g_provider *pp, int r, int w, int e) 71{ 72 struct disk *dp; 73 dev_t dev; 74 int error; 75 76 g_trace(G_T_ACCESS, "g_disk_access(%s, %d, %d, %d)", 77 pp->name, r, w, e); 78 g_topology_assert(); 79 r += pp->acr; 80 w += pp->acw; 81 e += pp->ace; 82 dp = pp->geom->softc; 83 dev = dp->d_dev; 84 if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) { 85 mtx_lock(&Giant); 86 error = devsw(dev)->d_open(dev, 3, 0, NULL); 87 if (error != 0) 88 printf("Opened disk %s -> %d\n", pp->name, error); 89 mtx_unlock(&Giant); 90 } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) { 91 mtx_lock(&Giant); 92 error = devsw(dev)->d_close(dev, 3, 0, NULL); 93 if (error != 0) 94 printf("Closed disk %s -> %d\n", pp->name, error); 95 mtx_unlock(&Giant); 96 } else { 97 error = 0; 98 } 99 return (error); 100} 101 102static void 103g_disk_done(struct bio *bp) 104{ 105 106 mtx_unlock(&Giant); 107 bp->bio_completed = bp->bio_length - bp->bio_resid; 108 g_std_done(bp); 109 mtx_lock(&Giant); 110} 111 112static void 113g_disk_start(struct bio *bp) 114{ 115 struct bio *bp2; 116 dev_t dev; 117 struct disk *dp; 118 struct g_ioctl *gio; 119 int error; 120 121 dp = bp->bio_to->geom->softc; 122 dev = dp->d_dev; 123 error = 0; 124 switch(bp->bio_cmd) { 125 case BIO_READ: 126 case BIO_WRITE: 127 bp2 = g_clone_bio(bp); 128 bp2->bio_done = g_disk_done; 129 bp2->bio_blkno = bp2->bio_offset >> DEV_BSHIFT; 130 bp2->bio_pblkno = bp2->bio_blkno; 131 bp2->bio_bcount = bp2->bio_length; 132 bp2->bio_dev = dev; 133 mtx_lock(&Giant); 134 devsw(dev)->d_strategy(bp2); 135 mtx_unlock(&Giant); 136 break; 137 case BIO_GETATTR: 138 if (g_haveattr_int(bp, "GEOM::sectorsize", 139 dp->d_label.d_secsize)) 140 break; 141 else if (g_haveattr_int(bp, "GEOM::fwsectors", 142 dp->d_label.d_nsectors)) 143 break; 144 else if (g_haveattr_int(bp, "GEOM::fwheads", 145 dp->d_label.d_ntracks)) 146 break; 147 else if (g_haveattr_int(bp, "GEOM::fwcylinders", 148 dp->d_label.d_ncylinders)) 149 break; 150 else if (g_haveattr_off_t(bp, "GEOM::mediasize", 151 dp->d_label.d_secsize * (off_t)dp->d_label.d_secperunit)) 152 break; 153 else if (!strcmp(bp->bio_attribute, "GEOM::ioctl") && 154 bp->bio_length == sizeof *gio) { 155 gio = (struct g_ioctl *)bp->bio_data; 156 mtx_lock(&Giant); 157 error = devsw(dev)->d_ioctl(dev, gio->cmd, 158 gio->data, gio->fflag, gio->td); 159 mtx_unlock(&Giant); 160 } else 161 error = ENOIOCTL; 162 break; 163 default: 164 error = EOPNOTSUPP; 165 break; 166 } 167 if (error) { 168 bp->bio_error = error; 169 g_io_deliver(bp); 170 } 171 return; 172} 173 174dev_t 175disk_create(int unit, struct disk *dp, int flags, struct cdevsw *cdevsw, struct cdevsw *proto) 176{ 177 static int once; 178 struct g_geom *gp; 179 struct g_provider *pp; 180 dev_t dev; 181 182 mtx_unlock(&Giant); 183 if (!once) { 184 g_add_class(&g_disk_class); 185 once++; 186 } 187 dev = g_malloc(sizeof *dev, M_WAITOK | M_ZERO); 188 dp->d_dev = dev; 189 dev->si_devsw = cdevsw; 190 dev->si_disk = dp; 191 dev->si_udev = dkmakeminor(unit, WHOLE_DISK_SLICE, RAW_PART); 192 g_topology_lock(); 193 gp = g_new_geomf(&g_disk_class, "%s%d", cdevsw->d_name, unit); 194 gp->start = g_disk_start; 195 gp->softc = dp; 196 dp->d_softc = gp; 197 pp = g_new_providerf(gp, "%s", gp->name); 198 g_error_provider(pp, 0); 199 g_topology_unlock(); 200 mtx_lock(&Giant); 201 return (dev); 202} 203 204void disk_dev_synth(dev_t dev); 205 206void 207disk_dev_synth(dev_t dev) 208{ 209 210 return; 211} 212 213void 214disk_destroy(dev_t dev) 215{ 216 struct disk *dp; 217 struct g_geom *gp; 218 219 dp = dev->si_disk; 220 gp = dp->d_softc; 221 g_free(dev); 222 gp->flags |= G_GEOM_WITHER; 223 g_orphan_provider(LIST_FIRST(&gp->provider), ENXIO); 224} 225 226void 227disk_invalidate (struct disk *disk) 228{ 229} 230 231int 232disk_dumpcheck(dev_t dev, u_int *count, u_int *blkno, u_int *secsize) 233{ 234 235 return (ENXIO); 236} 237 238 239SYSCTL_INT(_debug_sizeof, OID_AUTO, disklabel, CTLFLAG_RD, 240 0, sizeof(struct disklabel), "sizeof(struct disklabel)"); 241 242SYSCTL_INT(_debug_sizeof, OID_AUTO, diskslices, CTLFLAG_RD, 243 0, sizeof(struct diskslices), "sizeof(struct diskslices)"); 244 245SYSCTL_INT(_debug_sizeof, OID_AUTO, disk, CTLFLAG_RD, 246 0, sizeof(struct disk), "sizeof(struct disk)"); 247