geom_disk.c revision 104312
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 104312 2002-10-01 18:42:32Z 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_ioctl(void *arg) 130{ 131 struct bio *bp; 132 dev_t dev; 133 struct disk *dp; 134 struct g_ioctl *gio; 135 int error; 136 137 bp = arg; 138 dp = bp->bio_to->geom->softc; 139 dev = dp->d_dev; 140 gio = (struct g_ioctl *)bp->bio_data; 141 mtx_lock(&Giant); 142 error = devsw(dev)->d_ioctl(dev, gio->cmd, 143 gio->data, gio->fflag, gio->td); 144 mtx_unlock(&Giant); 145 g_io_deliver(bp, error); 146} 147 148static void 149g_disk_start(struct bio *bp) 150{ 151 struct bio *bp2; 152 dev_t dev; 153 struct disk *dp; 154 struct g_ioctl *gio; 155 int error; 156 157 dp = bp->bio_to->geom->softc; 158 dev = dp->d_dev; 159 error = 0; 160 switch(bp->bio_cmd) { 161 case BIO_READ: 162 case BIO_WRITE: 163 bp2 = g_clone_bio(bp); 164 bp2->bio_done = g_disk_done; 165 bp2->bio_blkno = bp2->bio_offset >> DEV_BSHIFT; 166 bp2->bio_pblkno = bp2->bio_blkno; 167 bp2->bio_bcount = bp2->bio_length; 168 bp2->bio_dev = dev; 169 mtx_lock(&Giant); 170 devsw(dev)->d_strategy(bp2); 171 mtx_unlock(&Giant); 172 break; 173 case BIO_GETATTR: 174 if (g_handleattr_int(bp, "GEOM::sectorsize", dp->d_sectorsize)) 175 break; 176 else if (g_handleattr_int(bp, "GEOM::fwsectors", dp->d_fwsectors)) 177 break; 178 else if (g_handleattr_int(bp, "GEOM::fwheads", dp->d_fwheads)) 179 break; 180 else if (g_handleattr_off_t(bp, "GEOM::mediasize", dp->d_mediasize)) 181 break; 182 else if (g_handleattr_off_t(bp, "GEOM::frontstuff", 0)) 183 break; 184 else if (!strcmp(bp->bio_attribute, "GEOM::kerneldump")) 185 g_disk_kerneldump(bp, dp); 186 else if (!strcmp(bp->bio_attribute, "GEOM::ioctl") && 187 bp->bio_length == sizeof *gio) { 188 g_call_me(g_disk_ioctl, bp); 189 return; 190 } else 191 error = ENOIOCTL; 192 break; 193 default: 194 error = EOPNOTSUPP; 195 break; 196 } 197 if (error) { 198 g_io_deliver(bp, error); 199 } 200 return; 201} 202 203dev_t 204disk_create(int unit, struct disk *dp, int flags, struct cdevsw *cdevsw, struct cdevsw *proto) 205{ 206 static int once; 207 struct g_geom *gp; 208 struct g_provider *pp; 209 dev_t dev; 210 211 mtx_unlock(&Giant); 212 if (!once) { 213 g_add_class(&g_disk_class); 214 once++; 215 } 216 dev = g_malloc(sizeof *dev, M_WAITOK | M_ZERO); 217 dp->d_dev = dev; 218 dp->d_devsw = cdevsw; 219 dev->si_devsw = cdevsw; 220 dev->si_disk = dp; 221 dev->si_udev = dkmakeminor(unit, WHOLE_DISK_SLICE, RAW_PART); 222 g_topology_lock(); 223 gp = g_new_geomf(&g_disk_class, "%s%d", cdevsw->d_name, unit); 224 strcpy(dev->si_name, gp->name); 225 gp->start = g_disk_start; 226 gp->access = g_disk_access; 227 gp->softc = dp; 228 dp->d_softc = gp; 229 pp = g_new_providerf(gp, "%s", gp->name); 230 g_error_provider(pp, 0); 231 g_topology_unlock(); 232 mtx_lock(&Giant); 233 return (dev); 234} 235 236void disk_dev_synth(dev_t dev); 237 238void 239disk_dev_synth(dev_t dev) 240{ 241 242 return; 243} 244 245void 246disk_destroy(dev_t dev) 247{ 248 struct disk *dp; 249 struct g_geom *gp; 250 251 dp = dev->si_disk; 252 gp = dp->d_softc; 253 g_free(dev); 254 gp->flags |= G_GEOM_WITHER; 255 g_orphan_provider(LIST_FIRST(&gp->provider), ENXIO); 256} 257 258void 259disk_invalidate (struct disk *disk) 260{ 261} 262 263 264SYSCTL_INT(_debug_sizeof, OID_AUTO, disklabel, CTLFLAG_RD, 265 0, sizeof(struct disklabel), "sizeof(struct disklabel)"); 266 267SYSCTL_INT(_debug_sizeof, OID_AUTO, diskslices, CTLFLAG_RD, 268 0, sizeof(struct diskslices), "sizeof(struct diskslices)"); 269 270SYSCTL_INT(_debug_sizeof, OID_AUTO, disk, CTLFLAG_RD, 271 0, sizeof(struct disk), "sizeof(struct disk)"); 272