geom_disk.c revision 104195
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 104195 2002-09-30 08:54:46Z phk $ 36 */ 37 38#include <sys/param.h> 39#include <sys/systm.h> 40#include <sys/kernel.h> 41#include <sys/sysctl.h> 42#include <sys/bio.h> 43#include <sys/conf.h> 44#include <sys/disk.h> 45#include <sys/diskslice.h> 46#include <sys/disklabel.h> 47#include <sys/malloc.h> 48#include <sys/sysctl.h> 49#include <sys/stdint.h> 50#include <machine/md_var.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", 61 NULL, 62 NULL, 63 G_CLASS_INITIALIZER 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 pp->mediasize = dp->d_mediasize; 97 return (error); 98} 99 100static void 101g_disk_kerneldump(struct bio *bp, struct disk *dp) 102{ 103 int error; 104 struct g_kerneldump *gkd; 105 struct dumperinfo di; 106 107 gkd = (struct g_kerneldump*)bp->bio_data; 108 printf("Kerneldump off=%jd len=%jd\n", (intmax_t)gkd->offset, (intmax_t)gkd->length); 109 di.dumper = (dumper_t *)dp->d_devsw->d_dump; 110 di.priv = dp->d_dev; 111 di.blocksize = dp->d_sectorsize; 112 di.mediaoffset = gkd->offset; 113 di.mediasize = gkd->length; 114 error = set_dumper(&di); 115 g_io_deliver(bp, error); 116} 117 118static void 119g_disk_done(struct bio *bp) 120{ 121 122 mtx_unlock(&Giant); 123 bp->bio_completed = bp->bio_length - bp->bio_resid; 124 g_std_done(bp); 125 mtx_lock(&Giant); 126} 127 128static void 129g_disk_start(struct bio *bp) 130{ 131 struct bio *bp2; 132 dev_t dev; 133 struct disk *dp; 134 struct g_ioctl *gio; 135 int error; 136 137 dp = bp->bio_to->geom->softc; 138 dev = dp->d_dev; 139 error = 0; 140 switch(bp->bio_cmd) { 141 case BIO_READ: 142 case BIO_WRITE: 143 bp2 = g_clone_bio(bp); 144 bp2->bio_done = g_disk_done; 145 bp2->bio_blkno = bp2->bio_offset >> DEV_BSHIFT; 146 bp2->bio_pblkno = bp2->bio_blkno; 147 bp2->bio_bcount = bp2->bio_length; 148 bp2->bio_dev = dev; 149 mtx_lock(&Giant); 150 devsw(dev)->d_strategy(bp2); 151 mtx_unlock(&Giant); 152 break; 153 case BIO_GETATTR: 154 if (g_handleattr_int(bp, "GEOM::sectorsize", dp->d_sectorsize)) 155 break; 156 else if (g_handleattr_int(bp, "GEOM::fwsectors", dp->d_fwsectors)) 157 break; 158 else if (g_handleattr_int(bp, "GEOM::fwheads", dp->d_fwheads)) 159 break; 160 else if (g_handleattr_off_t(bp, "GEOM::mediasize", dp->d_mediasize)) 161 break; 162 else if (g_handleattr_off_t(bp, "GEOM::frontstuff", 0)) 163 break; 164 else if (!strcmp(bp->bio_attribute, "GEOM::kerneldump")) 165 g_disk_kerneldump(bp, dp); 166 else if (!strcmp(bp->bio_attribute, "GEOM::ioctl") && 167 bp->bio_length == sizeof *gio) { 168 gio = (struct g_ioctl *)bp->bio_data; 169 mtx_lock(&Giant); 170 error = devsw(dev)->d_ioctl(dev, gio->cmd, 171 gio->data, gio->fflag, gio->td); 172 mtx_unlock(&Giant); 173 } else 174 error = ENOIOCTL; 175 break; 176 default: 177 error = EOPNOTSUPP; 178 break; 179 } 180 if (error) { 181 g_io_deliver(bp, error); 182 } 183 return; 184} 185 186dev_t 187disk_create(int unit, struct disk *dp, int flags, struct cdevsw *cdevsw, struct cdevsw *proto) 188{ 189 static int once; 190 struct g_geom *gp; 191 struct g_provider *pp; 192 dev_t dev; 193 194 mtx_unlock(&Giant); 195 if (!once) { 196 g_add_class(&g_disk_class); 197 once++; 198 } 199 dev = g_malloc(sizeof *dev, M_WAITOK | M_ZERO); 200 dp->d_dev = dev; 201 dp->d_devsw = cdevsw; 202 dev->si_devsw = cdevsw; 203 dev->si_disk = dp; 204 dev->si_udev = dkmakeminor(unit, WHOLE_DISK_SLICE, RAW_PART); 205 g_topology_lock(); 206 gp = g_new_geomf(&g_disk_class, "%s%d", cdevsw->d_name, unit); 207 strcpy(dev->si_name, gp->name); 208 gp->start = g_disk_start; 209 gp->access = g_disk_access; 210 gp->softc = dp; 211 dp->d_softc = gp; 212 pp = g_new_providerf(gp, "%s", gp->name); 213 g_error_provider(pp, 0); 214 g_topology_unlock(); 215 mtx_lock(&Giant); 216 return (dev); 217} 218 219void disk_dev_synth(dev_t dev); 220 221void 222disk_dev_synth(dev_t dev) 223{ 224 225 return; 226} 227 228void 229disk_destroy(dev_t dev) 230{ 231 struct disk *dp; 232 struct g_geom *gp; 233 234 dp = dev->si_disk; 235 gp = dp->d_softc; 236 g_free(dev); 237 gp->flags |= G_GEOM_WITHER; 238 g_orphan_provider(LIST_FIRST(&gp->provider), ENXIO); 239} 240 241void 242disk_invalidate (struct disk *disk) 243{ 244} 245 246 247SYSCTL_INT(_debug_sizeof, OID_AUTO, disklabel, CTLFLAG_RD, 248 0, sizeof(struct disklabel), "sizeof(struct disklabel)"); 249 250SYSCTL_INT(_debug_sizeof, OID_AUTO, diskslices, CTLFLAG_RD, 251 0, sizeof(struct diskslices), "sizeof(struct diskslices)"); 252 253SYSCTL_INT(_debug_sizeof, OID_AUTO, disk, CTLFLAG_RD, 254 0, sizeof(struct disk), "sizeof(struct disk)"); 255