geom_disk.c revision 110419
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 110419 2003-02-05 21:13:08Z 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/fcntl.h> 48#include <sys/malloc.h> 49#include <sys/sysctl.h> 50#include <sys/stdint.h> 51#include <machine/md_var.h> 52 53 54#include <sys/lock.h> 55#include <sys/mutex.h> 56#include <geom/geom.h> 57 58static g_access_t g_disk_access; 59 60struct g_class g_disk_class = { 61 "DISK", 62 NULL, 63 NULL, 64 G_CLASS_INITIALIZER 65}; 66 67DECLARE_GEOM_CLASS(g_disk_class, g_disk); 68 69static void __inline 70g_disk_lock_giant(struct disk *dp) 71{ 72 if (dp->d_flags & DISKFLAG_NOGIANT) 73 return; 74 mtx_lock(&Giant); 75} 76 77static void __inline 78g_disk_unlock_giant(struct disk *dp) 79{ 80 if (dp->d_flags & DISKFLAG_NOGIANT) 81 return; 82 mtx_unlock(&Giant); 83} 84 85static int 86g_disk_access(struct g_provider *pp, int r, int w, int e) 87{ 88 struct disk *dp; 89 dev_t dev; 90 int error; 91 92 g_trace(G_T_ACCESS, "g_disk_access(%s, %d, %d, %d)", 93 pp->name, r, w, e); 94 g_topology_assert(); 95 r += pp->acr; 96 w += pp->acw; 97 e += pp->ace; 98 dp = pp->geom->softc; 99 dev = dp->d_dev; 100 error = 0; 101 if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) { 102 if (dp->d_open != NULL || dp->d_copen != NULL) { 103 g_disk_lock_giant(dp); 104 if (dp->d_open != NULL) 105 error = dp->d_open(dp); 106 else 107 error = dp->d_copen(dev, FREAD|FWRITE, 0, NULL); 108 if (error != 0) 109 printf("Opened disk %s -> %d\n", 110 pp->name, error); 111 g_disk_unlock_giant(dp); 112 } 113 pp->mediasize = dp->d_mediasize; 114 pp->sectorsize = dp->d_sectorsize; 115 dp->d_flags |= DISKFLAG_OPEN; 116 } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) { 117 if (dp->d_close != NULL || dp->d_cclose != NULL) { 118 g_disk_lock_giant(dp); 119 if (dp->d_close != NULL) 120 error = dp->d_close(dp); 121 else 122 error = dp->d_cclose(dev, FREAD|FWRITE, 0, NULL); 123 if (error != 0) 124 printf("Closed disk %s -> %d\n", 125 pp->name, error); 126 g_disk_unlock_giant(dp); 127 } 128 dp->d_flags &= ~DISKFLAG_OPEN; 129 } 130 return (error); 131} 132 133static void 134g_disk_kerneldump(struct bio *bp, struct disk *dp) 135{ 136 int error; 137 struct g_kerneldump *gkd; 138 struct dumperinfo di; 139 struct g_geom *gp; 140 141 gkd = (struct g_kerneldump*)bp->bio_data; 142 gp = bp->bio_to->geom; 143 g_trace(G_T_TOPOLOGY, "g_disk_kernedump(%s, %jd, %jd)", 144 gp->name, (intmax_t)gkd->offset, (intmax_t)gkd->length); 145 di.dumper = dp->d_dump; 146 di.priv = dp->d_dev; 147 di.blocksize = dp->d_sectorsize; 148 di.mediaoffset = gkd->offset; 149 di.mediasize = gkd->length; 150 error = set_dumper(&di); 151 g_io_deliver(bp, error); 152} 153 154static void 155g_disk_done(struct bio *bp) 156{ 157 struct disk *dp; 158 159 dp = bp->bio_disk; 160 bp->bio_completed = bp->bio_length - bp->bio_resid; 161 if (!(dp->d_flags & DISKFLAG_NOGIANT)) { 162 DROP_GIANT(); 163 g_std_done(bp); 164 PICKUP_GIANT(); 165 } else { 166 g_std_done(bp); 167 } 168} 169 170static void 171g_disk_start(struct bio *bp) 172{ 173 struct bio *bp2; 174 dev_t dev; 175 struct disk *dp; 176 struct g_ioctl *gio; 177 int error; 178 179 dp = bp->bio_to->geom->softc; 180 dev = dp->d_dev; 181 error = EJUSTRETURN; 182 switch(bp->bio_cmd) { 183 case BIO_DELETE: 184 if (!(dp->d_flags & DISKFLAG_CANDELETE)) { 185 error = 0; 186 break; 187 } 188 /* fall-through */ 189 case BIO_READ: 190 case BIO_WRITE: 191 bp2 = g_clone_bio(bp); 192 bp2->bio_done = g_disk_done; 193 bp2->bio_blkno = bp2->bio_offset >> DEV_BSHIFT; 194 bp2->bio_pblkno = bp2->bio_offset / dp->d_sectorsize; 195 bp2->bio_bcount = bp2->bio_length; 196 bp2->bio_dev = dev; 197 bp2->bio_disk = dp; 198 g_disk_lock_giant(dp); 199 dp->d_strategy(bp2); 200 g_disk_unlock_giant(dp); 201 break; 202 case BIO_GETATTR: 203 if (g_handleattr_int(bp, "GEOM::fwsectors", dp->d_fwsectors)) 204 break; 205 else if (g_handleattr_int(bp, "GEOM::fwheads", dp->d_fwheads)) 206 break; 207 else if (g_handleattr_off_t(bp, "GEOM::frontstuff", 0)) 208 break; 209 else if (!strcmp(bp->bio_attribute, "GEOM::kerneldump")) 210 g_disk_kerneldump(bp, dp); 211 else if ((dp->d_ioctl != NULL || dp->d_cioctl != NULL) && 212 !strcmp(bp->bio_attribute, "GEOM::ioctl") && 213 bp->bio_length == sizeof *gio) { 214 gio = (struct g_ioctl *)bp->bio_data; 215 if (dp->d_ioctl != NULL) { 216 gio->func = (d_ioctl_t *)(dp->d_ioctl); 217 gio->dev = dp; 218 } else { 219 gio->func = dp->d_cioctl; 220 gio->dev = dp->d_dev; 221 } 222 error = EDIRIOCTL; 223 } else 224 error = ENOIOCTL; 225 break; 226 case BIO_SETATTR: 227 if (!strcmp(bp->bio_attribute, "GEOM::ioctl") && 228 bp->bio_length == sizeof *gio) { 229 gio = (struct g_ioctl *)bp->bio_data; 230 gio->func = devsw(dp->d_dev)->d_ioctl; 231 gio->dev = dp->d_dev; 232 error = EDIRIOCTL; 233 } else 234 error = ENOIOCTL; 235 break; 236 default: 237 error = EOPNOTSUPP; 238 break; 239 } 240 if (error != EJUSTRETURN) 241 g_io_deliver(bp, error); 242 return; 243} 244 245static void 246g_disk_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp) 247{ 248 struct disk *dp; 249 250 dp = gp->softc; 251 if (indent == NULL) { 252 sbuf_printf(sb, " hd %u", dp->d_fwheads); 253 sbuf_printf(sb, " sc %u", dp->d_fwsectors); 254 return; 255 } 256 if (pp != NULL) { 257 sbuf_printf(sb, "%s<fwheads>%u</fwheads>\n", 258 indent, dp->d_fwheads); 259 sbuf_printf(sb, "%s<fwsectors>%u</fwsectors>\n", 260 indent, dp->d_fwsectors); 261 } 262} 263 264static void 265g_disk_create(void *arg) 266{ 267 struct g_geom *gp; 268 struct g_provider *pp; 269 dev_t dev; 270 271 g_topology_assert(); 272 dev = arg; 273 gp = g_new_geomf(&g_disk_class, dev->si_name); 274 gp->start = g_disk_start; 275 gp->access = g_disk_access; 276 gp->softc = dev->si_disk; 277 gp->dumpconf = g_disk_dumpconf; 278 dev->si_disk->d_geom = gp; 279 pp = g_new_providerf(gp, "%s", gp->name); 280 pp->mediasize = dev->si_disk->d_mediasize; 281 pp->sectorsize = dev->si_disk->d_sectorsize; 282 g_error_provider(pp, 0); 283 if (bootverbose) 284 printf("GEOM: new disk %s\n", gp->name); 285} 286 287 288 289dev_t 290disk_create(int unit, struct disk *dp, int flags, struct cdevsw *cdevsw, void * unused __unused) 291{ 292 dev_t dev; 293 294 dev = g_malloc(sizeof *dev, M_ZERO); 295 dp->d_dev = dev; 296 dp->d_flags = flags; 297 dp->d_devsw = cdevsw; 298 dev->si_devsw = cdevsw; 299 if (cdevsw != NULL) { 300 dp->d_copen = cdevsw->d_open; 301 dp->d_cclose = cdevsw->d_close; 302 dp->d_cioctl = cdevsw->d_ioctl; 303 dp->d_strategy = cdevsw->d_strategy; 304 dp->d_dump = (dumper_t *)cdevsw->d_dump; 305 dp->d_name = cdevsw->d_name; 306 } 307 KASSERT(dp->d_strategy != NULL, ("disk_create need d_strategy")); 308 KASSERT(dp->d_name != NULL, ("disk_create need d_name")); 309 KASSERT(*dp->d_name != 0, ("disk_create need d_name")); 310 KASSERT(strlen(dp->d_name) < SPECNAMELEN - 4, ("disk name too long")); 311 dev->si_disk = dp; 312 dev->si_udev = 0x10002; /* XXX: Needed ? */ 313 dev->si_name = dev->__si_namebuf; 314 sprintf(dev->si_name, "%s%d", dp->d_name, unit); 315 g_call_me(g_disk_create, dev); 316 return (dev); 317} 318 319void 320disk_destroy(dev_t dev) 321{ 322 struct disk *dp; 323 struct g_geom *gp; 324 325 dp = dev->si_disk; 326 gp = dp->d_geom; 327 g_free(dev); 328 gp->flags |= G_GEOM_WITHER; 329 gp->softc = NULL; 330 g_orphan_provider(LIST_FIRST(&gp->provider), ENXIO); 331} 332 333static void 334g_kern_disks(void *p) 335{ 336 struct sbuf *sb; 337 struct g_geom *gp; 338 char *sp; 339 340 sb = p; 341 sp = ""; 342 g_topology_assert(); 343 LIST_FOREACH(gp, &g_disk_class.geom, geom) { 344 sbuf_printf(sb, "%s%s", sp, gp->name); 345 sp = " "; 346 } 347 sbuf_finish(sb); 348 wakeup(sb); 349} 350 351static int 352sysctl_disks(SYSCTL_HANDLER_ARGS) 353{ 354 int error; 355 struct sbuf *sb; 356 357 sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND); 358 sbuf_clear(sb); 359 g_call_me(g_kern_disks, sb); 360 do { 361 tsleep(sb, PZERO, "kern.disks", hz); 362 } while(!sbuf_done(sb)); 363 error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1); 364 sbuf_delete(sb); 365 return error; 366} 367 368SYSCTL_PROC(_kern, OID_AUTO, disks, CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_NOLOCK, 0, 0, 369 sysctl_disks, "A", "names of available disks"); 370 371