geom_disk.c revision 104602
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 104602 2002-10-07 06:25:26Z phk $ 36 */ 37 38#include "opt_geom.h" 39#ifndef NO_GEOM 40 41#include <sys/param.h> 42#include <sys/systm.h> 43#include <sys/kernel.h> 44#include <sys/sysctl.h> 45#include <sys/bio.h> 46#include <sys/conf.h> 47#include <sys/disk.h> 48#include <sys/diskslice.h> 49#include <sys/disklabel.h> 50#include <sys/malloc.h> 51#include <sys/sysctl.h> 52#include <sys/stdint.h> 53#include <machine/md_var.h> 54 55 56#include <sys/lock.h> 57#include <sys/mutex.h> 58#include <geom/geom.h> 59 60static g_access_t g_disk_access; 61 62struct g_class g_disk_class = { 63 "DISK", 64 NULL, 65 NULL, 66 G_CLASS_INITIALIZER 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 pp->mediasize = dp->d_mediasize; 100 return (error); 101} 102 103static void 104g_disk_kerneldump(struct bio *bp, struct disk *dp) 105{ 106 int error; 107 struct g_kerneldump *gkd; 108 struct dumperinfo di; 109 struct g_geom *gp; 110 111 gkd = (struct g_kerneldump*)bp->bio_data; 112 gp = bp->bio_to->geom; 113 g_trace(G_T_TOPOLOGY, "g_disk_kernedump(%s, %jd, %jd)", 114 gp->name, (intmax_t)gkd->offset, (intmax_t)gkd->length); 115 di.dumper = (dumper_t *)dp->d_devsw->d_dump; 116 di.priv = dp->d_dev; 117 di.blocksize = dp->d_sectorsize; 118 di.mediaoffset = gkd->offset; 119 di.mediasize = gkd->length; 120 error = set_dumper(&di); 121 g_io_deliver(bp, error); 122} 123 124static void 125g_disk_done(struct bio *bp) 126{ 127 128 mtx_unlock(&Giant); 129 bp->bio_completed = bp->bio_length - bp->bio_resid; 130 g_std_done(bp); 131 mtx_lock(&Giant); 132} 133 134static void 135g_disk_start(struct bio *bp) 136{ 137 struct bio *bp2; 138 dev_t dev; 139 struct disk *dp; 140 struct g_ioctl *gio; 141 int error; 142 143 dp = bp->bio_to->geom->softc; 144 dev = dp->d_dev; 145 error = 0; 146 switch(bp->bio_cmd) { 147 case BIO_READ: 148 case BIO_WRITE: 149 bp2 = g_clone_bio(bp); 150 bp2->bio_done = g_disk_done; 151 bp2->bio_blkno = bp2->bio_offset >> DEV_BSHIFT; 152 bp2->bio_pblkno = bp2->bio_blkno; 153 bp2->bio_bcount = bp2->bio_length; 154 bp2->bio_dev = dev; 155 mtx_lock(&Giant); 156 devsw(dev)->d_strategy(bp2); 157 mtx_unlock(&Giant); 158 break; 159 case BIO_GETATTR: 160 if (g_handleattr_int(bp, "GEOM::sectorsize", dp->d_sectorsize)) 161 break; 162 else if (g_handleattr_int(bp, "GEOM::fwsectors", dp->d_fwsectors)) 163 break; 164 else if (g_handleattr_int(bp, "GEOM::fwheads", dp->d_fwheads)) 165 break; 166 else if (g_handleattr_off_t(bp, "GEOM::mediasize", dp->d_mediasize)) 167 break; 168 else if (g_handleattr_off_t(bp, "GEOM::frontstuff", 0)) 169 break; 170 else if (!strcmp(bp->bio_attribute, "GEOM::kerneldump")) 171 g_disk_kerneldump(bp, dp); 172 else if (!strcmp(bp->bio_attribute, "GEOM::ioctl") && 173 bp->bio_length == sizeof *gio) { 174 gio = (struct g_ioctl *)bp->bio_data; 175 gio->func = devsw(dp->d_dev)->d_ioctl; 176 gio->dev = dp->d_dev; 177 error = EDIRIOCTL; 178 } else 179 error = ENOIOCTL; 180 break; 181 case BIO_SETATTR: 182 if (!strcmp(bp->bio_attribute, "GEOM::ioctl") && 183 bp->bio_length == sizeof *gio) { 184 gio = (struct g_ioctl *)bp->bio_data; 185 gio->func = devsw(dp->d_dev)->d_ioctl; 186 gio->dev = dp->d_dev; 187 error = EDIRIOCTL; 188 } else 189 error = ENOIOCTL; 190 break; 191 default: 192 error = EOPNOTSUPP; 193 break; 194 } 195 if (error) { 196 g_io_deliver(bp, error); 197 } 198 return; 199} 200 201dev_t 202disk_create(int unit, struct disk *dp, int flags, struct cdevsw *cdevsw, struct cdevsw *proto) 203{ 204 static int once; 205 struct g_geom *gp; 206 struct g_provider *pp; 207 dev_t dev; 208 209 mtx_unlock(&Giant); 210 if (!once) { 211 g_add_class(&g_disk_class); 212 once++; 213 } 214 dev = g_malloc(sizeof *dev, M_WAITOK | M_ZERO); 215 dp->d_dev = dev; 216 dp->d_devsw = cdevsw; 217 dev->si_devsw = cdevsw; 218 dev->si_disk = dp; 219 dev->si_udev = dkmakeminor(unit, WHOLE_DISK_SLICE, RAW_PART); 220 g_topology_lock(); 221 gp = g_new_geomf(&g_disk_class, "%s%d", cdevsw->d_name, unit); 222 strcpy(dev->si_name, gp->name); 223 gp->start = g_disk_start; 224 gp->access = g_disk_access; 225 gp->softc = dp; 226 dp->d_softc = gp; 227 pp = g_new_providerf(gp, "%s", gp->name); 228 g_error_provider(pp, 0); 229 g_topology_unlock(); 230 mtx_lock(&Giant); 231 return (dev); 232} 233 234void disk_dev_synth(dev_t dev); 235 236void 237disk_dev_synth(dev_t dev) 238{ 239 240 return; 241} 242 243void 244disk_destroy(dev_t dev) 245{ 246 struct disk *dp; 247 struct g_geom *gp; 248 249 dp = dev->si_disk; 250 gp = dp->d_softc; 251 g_free(dev); 252 gp->flags |= G_GEOM_WITHER; 253 g_orphan_provider(LIST_FIRST(&gp->provider), ENXIO); 254} 255 256void 257disk_invalidate (struct disk *disk) 258{ 259} 260 261static void 262g_kern_disks(void *p) 263{ 264 struct sbuf *sb; 265 struct g_geom *gp; 266 char *sp; 267 268 sb = p; 269 sp = ""; 270 g_topology_assert(); 271 LIST_FOREACH(gp, &g_disk_class.geom, geom) { 272 sbuf_printf(sb, "%s%s", sp, gp->name); 273 sp = " "; 274 } 275 sbuf_finish(sb); 276 wakeup(sb); 277} 278 279static int 280sysctl_disks(SYSCTL_HANDLER_ARGS) 281{ 282 int error; 283 struct sbuf *sb; 284 285 sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND); 286 sbuf_clear(sb); 287 g_call_me(g_kern_disks, sb); 288 do { 289 tsleep(sb, PZERO, "kern.disks", hz); 290 } while(!sbuf_done(sb)); 291 error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb)); 292 sbuf_delete(sb); 293 return error; 294} 295 296SYSCTL_PROC(_kern, OID_AUTO, disks, CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_NOLOCK, 0, 0, 297 sysctl_disks, "A", "names of available disks"); 298 299#endif 300