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/8.4/sys/geom/geom_dev.c 234912 2012-05-02 06:52:00Z 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 76 static struct g_class g_dev_class = { 77 .name = "DEV", 78 .version = G_VERSION, 79 .taste = g_dev_taste, 80 .orphan = g_dev_orphan, 81 }; 82 83 void 84 g_dev_print(void) 85 { 86 struct g_geom *gp; 87 char const *p = ""; 88 89 LIST_FOREACH(gp, &g_dev_class.geom, geom) { 90 printf("%s%s", p, gp->name); 91 p = " "; 92 } 93 printf("\n"); 94 } 95 96 struct g_provider * 97 g_dev_getprovider(struct cdev *dev) 98 { 99 struct g_consumer *cp; 100 101 g_topology_assert(); 102 if (dev == NULL) 103 return (NULL); 104 if (dev->si_devsw != &g_dev_cdevsw) 105 return (NULL); 106 cp = dev->si_drv2; 107 return (cp->provider); 108 } 109 110 111 static struct g_geom * 112 g_dev_taste(struct g_class *mp, struct g_provider *pp, int insist __unused) 113 { 114 struct g_geom *gp; 115 struct g_consumer *cp; 116 int error, len; 117 struct cdev *dev, *adev; 118 char buf[64], *val; 119 120 g_trace(G_T_TOPOLOGY, "dev_taste(%s,%s)", mp->name, pp->name); 121 g_topology_assert(); 122 LIST_FOREACH(cp, &pp->consumers, consumers) 123 if (cp->geom->class == mp) 124 return (NULL); 125 gp = g_new_geomf(mp, pp->name); 126 cp = g_new_consumer(gp); 127 error = g_attach(cp, pp); 128 KASSERT(error == 0, 129 ("g_dev_taste(%s) failed to g_attach, err=%d", pp->name, error)); 130 dev = make_dev(&g_dev_cdevsw, 0, 131 UID_ROOT, GID_OPERATOR, 0640, "%s", gp->name); 132 133 /* Search for device alias name and create it if found. */ 134 adev = NULL; 135 for (len = MIN(strlen(gp->name), sizeof(buf) - 15); len > 0; len--) { 136 snprintf(buf, sizeof(buf), "kern.devalias.%s", gp->name); 137 buf[14 + len] = 0; 138 val = getenv(buf); 139 if (val != NULL) { 140 snprintf(buf, sizeof(buf), "%s%s", 141 val, gp->name + len); 142 freeenv(val); 143 adev = make_dev_alias(dev, buf); 144 break; 145 } 146 } 147 148 if (pp->flags & G_PF_CANDELETE) 149 dev->si_flags |= SI_CANDELETE; 150 dev->si_iosize_max = MAXPHYS; 151 gp->softc = dev; 152 dev->si_drv1 = gp; 153 dev->si_drv2 = cp; 154 if (adev != NULL) { 155 if (pp->flags & G_PF_CANDELETE) 156 adev->si_flags |= SI_CANDELETE; 157 adev->si_iosize_max = MAXPHYS; 158 adev->si_drv1 = gp; 159 adev->si_drv2 = cp; 160 } 161 return (gp); 162 } 163 164 static int 165 g_dev_open(struct cdev *dev, int flags, int fmt, struct thread *td) 166 { 167 struct g_geom *gp; 168 struct g_consumer *cp; 169 int error, r, w, e; 170 171 gp = dev->si_drv1; 172 cp = dev->si_drv2; 173 if (gp == NULL || cp == NULL || gp->softc != dev) 174 return(ENXIO); /* g_dev_taste() not done yet */ 175 176 g_trace(G_T_ACCESS, "g_dev_open(%s, %d, %d, %p)", 177 gp->name, flags, fmt, td); 178 179 r = flags & FREAD ? 1 : 0; 180 w = flags & FWRITE ? 1 : 0; 181 #ifdef notyet 182 e = flags & O_EXCL ? 1 : 0; 183 #else 184 e = 0; 185 #endif 186 if (w) { 187 /* 188 * When running in very secure mode, do not allow 189 * opens for writing of any disks. 190 */ 191 error = securelevel_ge(td->td_ucred, 2); 192 if (error) 193 return (error); 194 } 195 g_topology_lock(); 196 if (dev->si_devsw == NULL) 197 error = ENXIO; /* We were orphaned */ 198 else 199 error = g_access(cp, r, w, e); 200 g_topology_unlock(); 201 return(error); 202 } 203 204 static int 205 g_dev_close(struct cdev *dev, int flags, int fmt, struct thread *td) 206 { 207 struct g_geom *gp; 208 struct g_consumer *cp; 209 int error, r, w, e, i; 210 211 gp = dev->si_drv1; 212 cp = dev->si_drv2; 213 if (gp == NULL || cp == NULL) 214 return(ENXIO); 215 g_trace(G_T_ACCESS, "g_dev_close(%s, %d, %d, %p)", 216 gp->name, flags, fmt, td); 217 r = flags & FREAD ? -1 : 0; 218 w = flags & FWRITE ? -1 : 0; 219 #ifdef notyet 220 e = flags & O_EXCL ? -1 : 0; 221 #else 222 e = 0; 223 #endif 224 g_topology_lock(); 225 if (dev->si_devsw == NULL) 226 error = ENXIO; /* We were orphaned */ 227 else 228 error = g_access(cp, r, w, e); 229 for (i = 0; i < 10 * hz;) { 230 if (cp->acr != 0 || cp->acw != 0) 231 break; 232 if (cp->nstart == cp->nend) 233 break; 234 pause("gdevwclose", hz / 10); 235 i += hz / 10; 236 } 237 if (cp->acr == 0 && cp->acw == 0 && cp->nstart != cp->nend) { 238 printf("WARNING: Final close of geom_dev(%s) %s %s\n", 239 gp->name, 240 "still has outstanding I/O after 10 seconds.", 241 "Completing close anyway, panic may happen later."); 242 } 243 g_topology_unlock(); 244 return (error); 245 } 246 247 /* 248 * XXX: Until we have unmessed the ioctl situation, there is a race against 249 * XXX: a concurrent orphanization. We cannot close it by holding topology 250 * XXX: since that would prevent us from doing our job, and stalling events 251 * XXX: will break (actually: stall) the BSD disklabel hacks. 252 */ 253 static int 254 g_dev_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td) 255 { 256 struct g_geom *gp; 257 struct g_consumer *cp; 258 struct g_provider *pp; 259 struct g_kerneldump kd; 260 off_t offset, length, chunk; 261 int i, error; 262 u_int u; 263 264 gp = dev->si_drv1; 265 cp = dev->si_drv2; 266 pp = cp->provider; 267 268 error = 0; 269 KASSERT(cp->acr || cp->acw, 270 ("Consumer with zero access count in g_dev_ioctl")); 271 272 i = IOCPARM_LEN(cmd); 273 switch (cmd) { 274 case DIOCGSECTORSIZE: 275 *(u_int *)data = cp->provider->sectorsize; 276 if (*(u_int *)data == 0) 277 error = ENOENT; 278 break; 279 case DIOCGMEDIASIZE: 280 *(off_t *)data = cp->provider->mediasize; 281 if (*(off_t *)data == 0) 282 error = ENOENT; 283 break; 284 case DIOCGFWSECTORS: 285 error = g_io_getattr("GEOM::fwsectors", cp, &i, data); 286 if (error == 0 && *(u_int *)data == 0) 287 error = ENOENT; 288 break; 289 case DIOCGFWHEADS: 290 error = g_io_getattr("GEOM::fwheads", cp, &i, data); 291 if (error == 0 && *(u_int *)data == 0) 292 error = ENOENT; 293 break; 294 case DIOCGFRONTSTUFF: 295 error = g_io_getattr("GEOM::frontstuff", cp, &i, data); 296 break; 297 case DIOCSKERNELDUMP: 298 u = *((u_int *)data); 299 if (!u) { 300 set_dumper(NULL); 301 error = 0; 302 break; 303 } 304 kd.offset = 0; 305 kd.length = OFF_MAX; 306 i = sizeof kd; 307 error = g_io_getattr("GEOM::kerneldump", cp, &i, &kd); 308 if (!error) { 309 error = set_dumper(&kd.di); 310 if (!error) 311 dev->si_flags |= SI_DUMPDEV; 312 } 313 break; 314 case DIOCGFLUSH: 315 error = g_io_flush(cp); 316 break; 317 case DIOCGDELETE: 318 offset = ((off_t *)data)[0]; 319 length = ((off_t *)data)[1]; 320 if ((offset % cp->provider->sectorsize) != 0 || 321 (length % cp->provider->sectorsize) != 0 || length <= 0) { 322 printf("%s: offset=%jd length=%jd\n", __func__, offset, 323 length); 324 error = EINVAL; 325 break; 326 } 327 while (length > 0) { 328 chunk = length; 329 if (chunk > 65536 * cp->provider->sectorsize) 330 chunk = 65536 * cp->provider->sectorsize; 331 error = g_delete_data(cp, offset, chunk); 332 length -= chunk; 333 offset += chunk; 334 if (error) 335 break; 336 /* 337 * Since the request size is unbounded, the service 338 * time is likewise. We make this ioctl interruptible 339 * by checking for signals for each bio. 340 */ 341 if (SIGPENDING(td)) 342 break; 343 } 344 break; 345 case DIOCGIDENT: 346 error = g_io_getattr("GEOM::ident", cp, &i, data); 347 break; 348 case DIOCGPROVIDERNAME: 349 if (pp == NULL) 350 return (ENOENT); 351 strlcpy(data, pp->name, i); 352 break; 353 case DIOCGSTRIPESIZE: 354 *(off_t *)data = cp->provider->stripesize; 355 break; 356 case DIOCGSTRIPEOFFSET: 357 *(off_t *)data = cp->provider->stripeoffset; 358 break; 359 default: 360 if (cp->provider->geom->ioctl != NULL) { 361 error = cp->provider->geom->ioctl(cp->provider, cmd, data, fflag, td); 362 } else { 363 error = ENOIOCTL; 364 } 365 } 366 367 return (error); 368 } 369 370 static void 371 g_dev_done(struct bio *bp2) 372 { 373 struct bio *bp; 374 375 bp = bp2->bio_parent; 376 bp->bio_error = bp2->bio_error; 377 if (bp->bio_error != 0) { 378 g_trace(G_T_BIO, "g_dev_done(%p) had error %d", 379 bp2, bp->bio_error); 380 bp->bio_flags |= BIO_ERROR; 381 } else { 382 g_trace(G_T_BIO, "g_dev_done(%p/%p) resid %ld completed %jd", 383 bp2, bp, bp->bio_resid, (intmax_t)bp2->bio_completed); 384 } 385 bp->bio_resid = bp->bio_length - bp2->bio_completed; 386 bp->bio_completed = bp2->bio_completed; 387 g_destroy_bio(bp2); 388 biodone(bp); 389 } 390 391 static void 392 g_dev_strategy(struct bio *bp) 393 { 394 struct g_consumer *cp; 395 struct bio *bp2; 396 struct cdev *dev; 397 398 KASSERT(bp->bio_cmd == BIO_READ || 399 bp->bio_cmd == BIO_WRITE || 400 bp->bio_cmd == BIO_DELETE, 401 ("Wrong bio_cmd bio=%p cmd=%d", bp, bp->bio_cmd)); 402 dev = bp->bio_dev; 403 cp = dev->si_drv2; 404 KASSERT(cp->acr || cp->acw, 405 ("Consumer with zero access count in g_dev_strategy")); 406 #ifdef INVARIANTS 407 if ((bp->bio_offset % cp->provider->sectorsize) != 0 || 408 (bp->bio_bcount % cp->provider->sectorsize) != 0) { 409 bp->bio_resid = bp->bio_bcount; 410 biofinish(bp, NULL, EINVAL); 411 return; 412 } 413 #endif 414 for (;;) { 415 /* 416 * XXX: This is not an ideal solution, but I belive it to 417 * XXX: deadlock safe, all things considered. 418 */ 419 bp2 = g_clone_bio(bp); 420 if (bp2 != NULL) 421 break; 422 pause("gdstrat", hz / 10); 423 } 424 KASSERT(bp2 != NULL, ("XXX: ENOMEM in a bad place")); 425 bp2->bio_done = g_dev_done; 426 g_trace(G_T_BIO, 427 "g_dev_strategy(%p/%p) offset %jd length %jd data %p cmd %d", 428 bp, bp2, (intmax_t)bp->bio_offset, (intmax_t)bp2->bio_length, 429 bp2->bio_data, bp2->bio_cmd); 430 g_io_request(bp2, cp); 431 KASSERT(cp->acr || cp->acw, 432 ("g_dev_strategy raced with g_dev_close and lost")); 433 434 } 435 436 /* 437 * g_dev_orphan() 438 * 439 * Called from below when the provider orphaned us. 440 * - Clear any dump settings. 441 * - Destroy the struct cdev *to prevent any more request from coming in. The 442 * provider is already marked with an error, so anything which comes in 443 * in the interrim will be returned immediately. 444 * - Wait for any outstanding I/O to finish. 445 * - Set our access counts to zero, whatever they were. 446 * - Detach and self-destruct. 447 */ 448 449 static void 450 g_dev_orphan(struct g_consumer *cp) 451 { 452 struct g_geom *gp; 453 struct cdev *dev; 454 455 g_topology_assert(); 456 gp = cp->geom; 457 dev = gp->softc; 458 g_trace(G_T_TOPOLOGY, "g_dev_orphan(%p(%s))", cp, gp->name); 459 460 /* Reset any dump-area set on this device */ 461 if (dev->si_flags & SI_DUMPDEV) 462 set_dumper(NULL); 463 464 /* Destroy the struct cdev *so we get no more requests */ 465 destroy_dev(dev); 466 467 /* Wait for the cows to come home */ 468 while (cp->nstart != cp->nend) 469 pause("gdevorphan", hz / 10); 470 471 if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0) 472 g_access(cp, -cp->acr, -cp->acw, -cp->ace); 473 474 g_detach(cp); 475 g_destroy_consumer(cp); 476 g_destroy_geom(gp); 477 } 478 479 DECLARE_GEOM_CLASS(g_dev_class, g_dev);
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