Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/geom/geom_dev.c
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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 36 #include <sys/cdefs.h> 37 __FBSDID("$FreeBSD: releng/7.4/sys/geom/geom_dev.c 212879 2010-09-19 20:02:31Z mav $"); 38 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/malloc.h> 42 #include <sys/kernel.h> 43 #include <sys/conf.h> 44 #include <sys/bio.h> 45 #include <sys/lock.h> 46 #include <sys/mutex.h> 47 #include <sys/proc.h> 48 #include <sys/errno.h> 49 #include <sys/time.h> 50 #include <sys/disk.h> 51 #include <sys/fcntl.h> 52 #include <sys/limits.h> 53 #include <geom/geom.h> 54 #include <geom/geom_int.h> 55 56 static d_open_t g_dev_open; 57 static d_close_t g_dev_close; 58 static d_strategy_t g_dev_strategy; 59 static d_ioctl_t g_dev_ioctl; 60 61 static struct cdevsw g_dev_cdevsw = { 62 .d_version = D_VERSION, 63 .d_open = g_dev_open, 64 .d_close = g_dev_close, 65 .d_read = physread, 66 .d_write = physwrite, 67 .d_ioctl = g_dev_ioctl, 68 .d_strategy = g_dev_strategy, 69 .d_name = "g_dev", 70 .d_flags = D_DISK | D_TRACKCLOSE, 71 }; 72 73 static g_taste_t g_dev_taste; 74 static g_orphan_t g_dev_orphan; 75 static g_init_t g_dev_init; 76 77 static struct g_class g_dev_class = { 78 .name = "DEV", 79 .version = G_VERSION, 80 .taste = g_dev_taste, 81 .orphan = g_dev_orphan, 82 .init = g_dev_init, 83 }; 84 85 static struct unrhdr *unithdr; /* Locked by topology */ 86 87 static void 88 g_dev_init(struct g_class *mp) 89 { 90 91 unithdr = new_unrhdr(0, minor2unit(MAXMINOR), NULL); 92 } 93 94 void 95 g_dev_print(void) 96 { 97 struct g_geom *gp; 98 char const *p = ""; 99 100 LIST_FOREACH(gp, &g_dev_class.geom, geom) { 101 printf("%s%s", p, gp->name); 102 p = " "; 103 } 104 printf("\n"); 105 } 106 107 struct g_provider * 108 g_dev_getprovider(struct cdev *dev) 109 { 110 struct g_consumer *cp; 111 112 g_topology_assert(); 113 if (dev == NULL) 114 return (NULL); 115 if (dev->si_devsw != &g_dev_cdevsw) 116 return (NULL); 117 cp = dev->si_drv2; 118 return (cp->provider); 119 } 120 121 122 static struct g_geom * 123 g_dev_taste(struct g_class *mp, struct g_provider *pp, int insist __unused) 124 { 125 struct g_geom *gp; 126 struct g_consumer *cp; 127 char *alias; 128 int error; 129 struct cdev *dev; 130 u_int unit; 131 132 g_trace(G_T_TOPOLOGY, "dev_taste(%s,%s)", mp->name, pp->name); 133 g_topology_assert(); 134 LIST_FOREACH(cp, &pp->consumers, consumers) 135 if (cp->geom->class == mp) 136 return (NULL); 137 gp = g_new_geomf(mp, pp->name); 138 cp = g_new_consumer(gp); 139 error = g_attach(cp, pp); 140 KASSERT(error == 0, 141 ("g_dev_taste(%s) failed to g_attach, err=%d", pp->name, error)); 142 unit = alloc_unr(unithdr); 143 dev = make_dev(&g_dev_cdevsw, unit2minor(unit), 144 UID_ROOT, GID_OPERATOR, 0640, gp->name); 145 if (pp->flags & G_PF_CANDELETE) 146 dev->si_flags |= SI_CANDELETE; 147 dev->si_iosize_max = MAXPHYS; 148 gp->softc = dev; 149 dev->si_drv1 = gp; 150 dev->si_drv2 = cp; 151 152 g_topology_unlock(); 153 154 alias = g_malloc(MAXPATHLEN, M_WAITOK | M_ZERO); 155 error = (pp->geom->ioctl == NULL) ? ENODEV : 156 pp->geom->ioctl(pp, DIOCGPROVIDERALIAS, alias, 0, curthread); 157 if (!error && alias[0] != '\0') 158 make_dev_alias(dev, "%s", alias); 159 g_free(alias); 160 161 g_topology_lock(); 162 return (gp); 163 } 164 165 static int 166 g_dev_open(struct cdev *dev, int flags, int fmt, struct thread *td) 167 { 168 struct g_geom *gp; 169 struct g_consumer *cp; 170 int error, r, w, e; 171 172 gp = dev->si_drv1; 173 cp = dev->si_drv2; 174 if (gp == NULL || cp == NULL || gp->softc != dev) 175 return(ENXIO); /* g_dev_taste() not done yet */ 176 177 g_trace(G_T_ACCESS, "g_dev_open(%s, %d, %d, %p)", 178 gp->name, flags, fmt, td); 179 180 r = flags & FREAD ? 1 : 0; 181 w = flags & FWRITE ? 1 : 0; 182 #ifdef notyet 183 e = flags & O_EXCL ? 1 : 0; 184 #else 185 e = 0; 186 #endif 187 if (w) { 188 /* 189 * When running in very secure mode, do not allow 190 * opens for writing of any disks. 191 */ 192 error = securelevel_ge(td->td_ucred, 2); 193 if (error) 194 return (error); 195 } 196 g_topology_lock(); 197 if (dev->si_devsw == NULL) 198 error = ENXIO; /* We were orphaned */ 199 else 200 error = g_access(cp, r, w, e); 201 g_topology_unlock(); 202 return(error); 203 } 204 205 static int 206 g_dev_close(struct cdev *dev, int flags, int fmt, struct thread *td) 207 { 208 struct g_geom *gp; 209 struct g_consumer *cp; 210 int error, r, w, e, i; 211 212 gp = dev->si_drv1; 213 cp = dev->si_drv2; 214 if (gp == NULL || cp == NULL) 215 return(ENXIO); 216 g_trace(G_T_ACCESS, "g_dev_close(%s, %d, %d, %p)", 217 gp->name, flags, fmt, td); 218 r = flags & FREAD ? -1 : 0; 219 w = flags & FWRITE ? -1 : 0; 220 #ifdef notyet 221 e = flags & O_EXCL ? -1 : 0; 222 #else 223 e = 0; 224 #endif 225 g_topology_lock(); 226 if (dev->si_devsw == NULL) 227 error = ENXIO; /* We were orphaned */ 228 else 229 error = g_access(cp, r, w, e); 230 for (i = 0; i < 10 * hz;) { 231 if (cp->acr != 0 || cp->acw != 0) 232 break; 233 if (cp->nstart == cp->nend) 234 break; 235 pause("gdevwclose", hz / 10); 236 i += hz / 10; 237 } 238 if (cp->acr == 0 && cp->acw == 0 && cp->nstart != cp->nend) { 239 printf("WARNING: Final close of geom_dev(%s) %s %s\n", 240 gp->name, 241 "still has outstanding I/O after 10 seconds.", 242 "Completing close anyway, panic may happen later."); 243 } 244 g_topology_unlock(); 245 return (error); 246 } 247 248 /* 249 * XXX: Until we have unmessed the ioctl situation, there is a race against 250 * XXX: a concurrent orphanization. We cannot close it by holding topology 251 * XXX: since that would prevent us from doing our job, and stalling events 252 * XXX: will break (actually: stall) the BSD disklabel hacks. 253 */ 254 static int 255 g_dev_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td) 256 { 257 struct g_geom *gp; 258 struct g_consumer *cp; 259 struct g_kerneldump kd; 260 off_t offset, length; 261 int i, error; 262 u_int u; 263 264 gp = dev->si_drv1; 265 cp = dev->si_drv2; 266 267 error = 0; 268 KASSERT(cp->acr || cp->acw, 269 ("Consumer with zero access count in g_dev_ioctl")); 270 271 i = IOCPARM_LEN(cmd); 272 switch (cmd) { 273 case DIOCGSECTORSIZE: 274 *(u_int *)data = cp->provider->sectorsize; 275 if (*(u_int *)data == 0) 276 error = ENOENT; 277 break; 278 case DIOCGMEDIASIZE: 279 *(off_t *)data = cp->provider->mediasize; 280 if (*(off_t *)data == 0) 281 error = ENOENT; 282 break; 283 case DIOCGFWSECTORS: 284 error = g_io_getattr("GEOM::fwsectors", cp, &i, data); 285 if (error == 0 && *(u_int *)data == 0) 286 error = ENOENT; 287 break; 288 case DIOCGFWHEADS: 289 error = g_io_getattr("GEOM::fwheads", cp, &i, data); 290 if (error == 0 && *(u_int *)data == 0) 291 error = ENOENT; 292 break; 293 case DIOCGFRONTSTUFF: 294 error = g_io_getattr("GEOM::frontstuff", cp, &i, data); 295 break; 296 case DIOCSKERNELDUMP: 297 u = *((u_int *)data); 298 if (!u) { 299 set_dumper(NULL); 300 error = 0; 301 break; 302 } 303 kd.offset = 0; 304 kd.length = OFF_MAX; 305 i = sizeof kd; 306 error = g_io_getattr("GEOM::kerneldump", cp, &i, &kd); 307 if (!error) 308 dev->si_flags |= SI_DUMPDEV; 309 break; 310 case DIOCGFLUSH: 311 error = g_io_flush(cp); 312 break; 313 case DIOCGDELETE: 314 offset = ((off_t *)data)[0]; 315 length = ((off_t *)data)[1]; 316 if ((offset % cp->provider->sectorsize) != 0 || 317 (length % cp->provider->sectorsize) != 0 || length <= 0) { 318 printf("%s: offset=%jd length=%jd\n", __func__, offset, 319 length); 320 error = EINVAL; 321 break; 322 } 323 error = g_delete_data(cp, offset, length); 324 break; 325 case DIOCGIDENT: 326 error = g_io_getattr("GEOM::ident", cp, &i, data); 327 break; 328 329 default: 330 if (cp->provider->geom->ioctl != NULL) { 331 error = cp->provider->geom->ioctl(cp->provider, cmd, data, fflag, td); 332 } else { 333 error = ENOIOCTL; 334 } 335 } 336 337 return (error); 338 } 339 340 static void 341 g_dev_done(struct bio *bp2) 342 { 343 struct bio *bp; 344 345 bp = bp2->bio_parent; 346 bp->bio_error = bp2->bio_error; 347 if (bp->bio_error != 0) { 348 g_trace(G_T_BIO, "g_dev_done(%p) had error %d", 349 bp2, bp->bio_error); 350 bp->bio_flags |= BIO_ERROR; 351 } else { 352 g_trace(G_T_BIO, "g_dev_done(%p/%p) resid %ld completed %jd", 353 bp2, bp, bp->bio_resid, (intmax_t)bp2->bio_completed); 354 } 355 bp->bio_resid = bp->bio_length - bp2->bio_completed; 356 bp->bio_completed = bp2->bio_completed; 357 g_destroy_bio(bp2); 358 biodone(bp); 359 } 360 361 static void 362 g_dev_strategy(struct bio *bp) 363 { 364 struct g_consumer *cp; 365 struct bio *bp2; 366 struct cdev *dev; 367 368 KASSERT(bp->bio_cmd == BIO_READ || 369 bp->bio_cmd == BIO_WRITE || 370 bp->bio_cmd == BIO_DELETE, 371 ("Wrong bio_cmd bio=%p cmd=%d", bp, bp->bio_cmd)); 372 dev = bp->bio_dev; 373 cp = dev->si_drv2; 374 KASSERT(cp->acr || cp->acw, 375 ("Consumer with zero access count in g_dev_strategy")); 376 #ifdef INVARIANTS 377 if ((bp->bio_offset % cp->provider->sectorsize) != 0 || 378 (bp->bio_bcount % cp->provider->sectorsize) != 0) { 379 bp->bio_resid = bp->bio_bcount; 380 biofinish(bp, NULL, EINVAL); 381 return; 382 } 383 #endif 384 for (;;) { 385 /* 386 * XXX: This is not an ideal solution, but I belive it to 387 * XXX: deadlock safe, all things considered. 388 */ 389 bp2 = g_clone_bio(bp); 390 if (bp2 != NULL) 391 break; 392 pause("gdstrat", hz / 10); 393 } 394 KASSERT(bp2 != NULL, ("XXX: ENOMEM in a bad place")); 395 bp2->bio_done = g_dev_done; 396 g_trace(G_T_BIO, 397 "g_dev_strategy(%p/%p) offset %jd length %jd data %p cmd %d", 398 bp, bp2, (intmax_t)bp->bio_offset, (intmax_t)bp2->bio_length, 399 bp2->bio_data, bp2->bio_cmd); 400 g_io_request(bp2, cp); 401 KASSERT(cp->acr || cp->acw, 402 ("g_dev_strategy raced with g_dev_close and lost")); 403 404 } 405 406 /* 407 * g_dev_orphan() 408 * 409 * Called from below when the provider orphaned us. 410 * - Clear any dump settings. 411 * - Destroy the struct cdev *to prevent any more request from coming in. The 412 * provider is already marked with an error, so anything which comes in 413 * in the interrim will be returned immediately. 414 * - Wait for any outstanding I/O to finish. 415 * - Set our access counts to zero, whatever they were. 416 * - Detach and self-destruct. 417 */ 418 419 static void 420 g_dev_orphan(struct g_consumer *cp) 421 { 422 struct g_geom *gp; 423 struct cdev *dev; 424 u_int unit; 425 426 g_topology_assert(); 427 gp = cp->geom; 428 dev = gp->softc; 429 g_trace(G_T_TOPOLOGY, "g_dev_orphan(%p(%s))", cp, gp->name); 430 431 /* Reset any dump-area set on this device */ 432 if (dev->si_flags & SI_DUMPDEV) 433 set_dumper(NULL); 434 435 /* Destroy the struct cdev *so we get no more requests */ 436 unit = dev2unit(dev); 437 destroy_dev(dev); 438 free_unr(unithdr, unit); 439 440 /* Wait for the cows to come home */ 441 while (cp->nstart != cp->nend) 442 pause("gdevorphan", hz / 10); 443 444 if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0) 445 g_access(cp, -cp->acr, -cp->acw, -cp->ace); 446 447 g_detach(cp); 448 g_destroy_consumer(cp); 449 g_destroy_geom(gp); 450 } 451 452 DECLARE_GEOM_CLASS(g_dev_class, g_dev);
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