geom_dev.c revision 93250
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_dev.c 93250 2002-03-26 22:07:38Z phk $ 36 */ 37 38#include <sys/param.h> 39#include <sys/systm.h> 40#include <sys/malloc.h> 41#include <sys/kernel.h> 42#include <sys/conf.h> 43#include <sys/bio.h> 44#include <sys/lock.h> 45#include <sys/mutex.h> 46#include <sys/errno.h> 47#include <sys/time.h> 48#include <sys/disk.h> 49#include <sys/fcntl.h> 50#include <geom/geom.h> 51 52#define CDEV_MAJOR 4 53 54static d_open_t g_dev_open; 55static d_close_t g_dev_close; 56static d_strategy_t g_dev_strategy; 57static d_ioctl_t g_dev_ioctl; 58static d_psize_t g_dev_psize; 59 60static struct cdevsw g_dev_cdevsw = { 61 /* open */ g_dev_open, 62 /* close */ g_dev_close, 63 /* read */ physread, 64 /* write */ physwrite, 65 /* ioctl */ g_dev_ioctl, 66 /* poll */ nopoll, 67 /* mmap */ nommap, 68 /* strategy */ g_dev_strategy, 69 /* name */ "g_dev", 70 /* maj */ CDEV_MAJOR, 71 /* dump */ nodump, 72 /* psize */ g_dev_psize, 73 /* flags */ D_DISK | D_CANFREE | D_TRACKCLOSE, 74}; 75 76static g_taste_t g_dev_taste; 77static g_orphan_t g_dev_orphan; 78 79static struct g_class g_dev_class = { 80 "DEV-class", 81 g_dev_taste, 82 NULL, 83 g_dev_orphan, 84 NULL, 85 G_CLASS_INITSTUFF 86}; 87 88static void 89g_dev_clone(void *arg, char *name, int namelen, dev_t *dev) 90{ 91 struct g_geom *gp; 92 93 if (*dev != NODEV) 94 return; 95 96 g_trace(G_T_TOPOLOGY, "g_dev_clone(%s)", name); 97 g_rattle(); 98 99 /* XXX: can I drop Giant here ??? */ 100 /* g_topology_lock(); */ 101 LIST_FOREACH(gp, &g_dev_class.geom, geom) { 102 if (strcmp(gp->name, name)) 103 continue; 104 *dev = gp->softc; 105 g_trace(G_T_TOPOLOGY, "g_dev_clone(%s) = %p", name, *dev); 106 return; 107 } 108 /* g_topology_unlock(); */ 109 return; 110} 111 112static void 113g_dev_register_cloner(void *foo __unused) 114{ 115 static int once; 116 117 if (!once) { 118 if (!once) 119 EVENTHANDLER_REGISTER(dev_clone, g_dev_clone, 0, 1000); 120 once++; 121 } 122} 123 124SYSINIT(geomdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE,g_dev_register_cloner,NULL); 125 126static struct g_geom * 127g_dev_taste(struct g_class *mp, struct g_provider *pp, int insist __unused) 128{ 129 struct g_geom *gp; 130 struct g_consumer *cp; 131 static int unit; 132 u_int secsize; 133 off_t mediasize; 134 int error, j; 135 dev_t dev; 136 137 g_trace(G_T_TOPOLOGY, "dev_taste(%s,%s)", mp->name, pp->name); 138 g_topology_assert(); 139 LIST_FOREACH(cp, &pp->consumers, consumers) 140 if (cp->geom->class == mp) 141 return (NULL); 142 gp = g_new_geomf(mp, pp->name); 143 cp = g_new_consumer(gp); 144 g_attach(cp, pp); 145 error = g_access_rel(cp, 1, 0, 0); 146 g_topology_unlock(); 147 if (!error) { 148 j = sizeof secsize; 149 error = g_io_getattr("GEOM::sectorsize", cp, &j, &secsize); 150 if (error) { 151 secsize = 512; 152 printf("g_bsd_taste: error %d Sectors are %d bytes\n", 153 error, secsize); 154 } 155 j = sizeof mediasize; 156 error = g_io_getattr("GEOM::mediasize", cp, &j, &mediasize); 157 if (error) { 158 mediasize = 0; 159 printf("g_error %d Mediasize is %lld bytes\n", 160 error, mediasize); 161 } 162 g_topology_lock(); 163 g_access_rel(cp, -1, 0, 0); 164 g_topology_unlock(); 165 } else { 166 secsize = 512; 167 mediasize = 0; 168 } 169 mtx_lock(&Giant); 170 if (mediasize != 0) 171 printf("GEOM: \"%s\" %lld bytes in %lld sectors of %u bytes\n", 172 pp->name, mediasize, mediasize / secsize, secsize); 173 else 174 printf("GEOM: \"%s\" (size unavailable)\n", pp->name); 175 dev = make_dev(&g_dev_cdevsw, unit++, 176 UID_ROOT, GID_WHEEL, 0600, gp->name); 177 gp->softc = dev; 178 dev->si_drv1 = gp; 179 dev->si_drv2 = cp; 180 mtx_unlock(&Giant); 181 g_topology_lock(); 182 return (gp); 183} 184 185static int 186g_dev_open(dev_t dev, int flags, int fmt, struct thread *td) 187{ 188 struct g_geom *gp; 189 struct g_consumer *cp; 190 int error, r, w, e; 191 192 gp = dev->si_drv1; 193 cp = dev->si_drv2; 194 if (gp == NULL || cp == NULL) 195 return(ENXIO); 196 g_trace(G_T_ACCESS, "g_dev_open(%s, %d, %d, %p)", 197 gp->name, flags, fmt, td); 198 DROP_GIANT(); 199 g_topology_lock(); 200 g_silence(); 201 r = flags & FREAD ? 1 : 0; 202 w = flags & FWRITE ? 1 : 0; 203 e = flags & O_EXCL ? 1 : 0; 204 error = g_access_rel(cp, r, w, e); 205 g_topology_unlock(); 206 PICKUP_GIANT(); 207 g_rattle(); 208 return(error); 209} 210 211static int 212g_dev_close(dev_t dev, int flags, int fmt, struct thread *td) 213{ 214 struct g_geom *gp; 215 struct g_consumer *cp; 216 int error, r, w, e; 217 218 gp = dev->si_drv1; 219 cp = dev->si_drv2; 220 if (gp == NULL || cp == NULL) 221 return(ENXIO); 222 g_trace(G_T_ACCESS, "g_dev_close(%s, %d, %d, %p)", 223 gp->name, flags, fmt, td); 224 DROP_GIANT(); 225 g_topology_lock(); 226 g_silence(); 227 r = flags & FREAD ? -1 : 0; 228 w = flags & FWRITE ? -1 : 0; 229 e = flags & O_EXCL ? -1 : 0; 230 error = g_access_rel(cp, r, w, e); 231 g_topology_unlock(); 232 PICKUP_GIANT(); 233 g_rattle(); 234 return (error); 235} 236 237static int 238g_dev_ioctl(dev_t dev, u_long cmd, caddr_t data, int fflag, struct thread *td) 239{ 240 struct g_geom *gp; 241 struct g_consumer *cp; 242 int i, error; 243 struct g_ioctl *gio; 244 245 gp = dev->si_drv1; 246 cp = dev->si_drv2; 247 248 error = 0; 249 DROP_GIANT(); 250 251 i = IOCPARM_LEN(cmd); 252 switch (cmd) { 253 case DIOCGSECTORSIZE: 254 error = g_io_getattr("GEOM::sectorsize", cp, &i, data); 255 break; 256 case DIOCGMEDIASIZE: 257 error = g_io_getattr("GEOM::mediasize", cp, &i, data); 258 break; 259 case DIOCGFWSECTORS: 260 error = g_io_getattr("GEOM::fwsectors", cp, &i, data); 261 break; 262 case DIOCGFWHEADS: 263 error = g_io_getattr("GEOM::fwheads", cp, &i, data); 264 break; 265 case DIOCGFWCYLINDERS: 266 error = g_io_getattr("GEOM::fwcylinders", cp, &i, data); 267 break; 268 default: 269 gio = g_malloc(sizeof *gio, M_WAITOK); 270 gio->cmd = cmd; 271 gio->data = data; 272 gio->fflag = fflag; 273 gio->td = td; 274 i = sizeof *gio; 275 if (cmd & IOC_IN) 276 error = g_io_setattr("GEOM::ioctl", cp, i, gio); 277 else 278 error = g_io_getattr("GEOM::ioctl", cp, &i, gio); 279 g_free(gio); 280 break; 281 } 282 283 if (error != 0 && cmd == DIOCGDVIRGIN) { 284 g_topology_lock(); 285 gp = g_create_geomf("BSD-class", cp->provider, NULL); 286 g_topology_unlock(); 287 } 288 PICKUP_GIANT(); 289 g_rattle(); 290 if (error == ENOIOCTL) { 291 i = IOCGROUP(cmd); 292 printf("IOCTL(0x%lx) \"%s\"", cmd, gp->name); 293 if (i > ' ' && i <= '~') 294 printf(" '%c'", (int)IOCGROUP(cmd)); 295 else 296 printf(" 0x%lx", IOCGROUP(cmd)); 297 printf("/%ld ", cmd & 0xff); 298 if (cmd & IOC_IN) 299 printf("I"); 300 if (cmd & IOC_OUT) 301 printf("O"); 302 printf("(%ld) = ENOIOCTL\n", IOCPARM_LEN(cmd)); 303 error = ENOTTY; 304 } 305 return (error); 306} 307 308static int 309g_dev_psize(dev_t dev) 310{ 311 struct g_consumer *cp; 312 int i, error; 313 off_t mediasize; 314 315 cp = dev->si_drv2; 316 317 i = sizeof mediasize; 318 error = g_io_getattr("GEOM::mediasize", cp, &i, &mediasize); 319 if (error) 320 return (-1); 321 return (mediasize >> DEV_BSHIFT); 322} 323 324static void 325g_dev_done(struct bio *bp2) 326{ 327 struct bio *bp; 328 329 bp = bp2->bio_linkage; 330 bp->bio_error = bp2->bio_error; 331 if (bp->bio_error != 0) { 332 g_trace(G_T_BIO, "g_dev_done(%p) had error %d", 333 bp2, bp->bio_error); 334 bp->bio_flags |= BIO_ERROR; 335 } else { 336 g_trace(G_T_BIO, "g_dev_done(%p/%p) resid %ld completed %lld", 337 bp2, bp, bp->bio_resid, bp2->bio_completed); 338 } 339 bp->bio_resid = bp->bio_bcount - bp2->bio_completed; 340 g_destroy_bio(bp2); 341 mtx_lock(&Giant); 342 biodone(bp); 343 mtx_unlock(&Giant); 344} 345 346static void 347g_dev_strategy(struct bio *bp) 348{ 349 struct g_geom *gp; 350 struct g_consumer *cp; 351 struct bio *bp2; 352 dev_t dev; 353 354 dev = bp->bio_dev; 355 gp = dev->si_drv1; 356 cp = dev->si_drv2; 357 bp2 = g_clone_bio(bp); 358 bp2->bio_offset = (off_t)bp->bio_blkno << DEV_BSHIFT; 359 bp2->bio_length = (off_t)bp->bio_bcount; 360 bp2->bio_done = g_dev_done; 361 g_trace(G_T_BIO, 362 "g_dev_strategy(%p/%p) offset %lld length %lld data %p cmd %d", 363 bp, bp2, bp->bio_offset, bp2->bio_length, bp2->bio_data, 364 bp2->bio_cmd); 365 g_io_request(bp2, cp); 366} 367 368 369static void 370g_dev_orphan(struct g_consumer *cp) 371{ 372 struct g_geom *gp; 373 dev_t dev; 374 375 gp = cp->geom; 376 g_trace(G_T_TOPOLOGY, "g_dev_orphan(%p(%s))", cp, gp->name); 377 g_topology_assert(); 378 if (cp->biocount > 0) 379 return; 380 dev = gp->softc; 381 destroy_dev(dev); 382 if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0) 383 g_access_rel(cp, -cp->acr, -cp->acw, -cp->ace); 384 g_dettach(cp); 385 g_destroy_consumer(cp); 386 g_destroy_geom(gp); 387} 388 389DECLARE_GEOM_CLASS(g_dev_class, g_dev) 390 391