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/5.3/sys/geom/geom_dev.c 136588 2004-10-16 08:43:07Z cvs2svn $"); 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_maj = GEOM_MAJOR, 71 .d_flags = D_DISK | D_TRACKCLOSE, 72 }; 73 74 static g_taste_t g_dev_taste; 75 static g_orphan_t g_dev_orphan; 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 }; 83 84 void 85 g_dev_print(void) 86 { 87 struct g_geom *gp; 88 char const *p = ""; 89 90 LIST_FOREACH(gp, &g_dev_class.geom, geom) { 91 printf("%s%s", p, gp->name); 92 p = " "; 93 } 94 printf("\n"); 95 } 96 97 struct g_provider * 98 g_dev_getprovider(struct cdev *dev) 99 { 100 struct g_consumer *cp; 101 102 if (dev == NULL) 103 return (NULL); 104 if (devsw(dev) != &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 static int unit = GEOM_MINOR_PROVIDERS; 117 int error; 118 struct cdev *dev; 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 /* 131 * XXX: I'm not 100% sure we can call make_dev(9) without Giant 132 * yet. Once we can, we don't need to drop topology here either. 133 */ 134 g_topology_unlock(); 135 mtx_lock(&Giant); 136 dev = make_dev(&g_dev_cdevsw, unit2minor(unit++), 137 UID_ROOT, GID_OPERATOR, 0640, gp->name); 138 if (pp->flags & G_PF_CANDELETE) 139 dev->si_flags |= SI_CANDELETE; 140 mtx_unlock(&Giant); 141 g_topology_lock(); 142 dev->si_iosize_max = MAXPHYS; 143 dev->si_stripesize = pp->stripesize; 144 dev->si_stripeoffset = pp->stripeoffset; 145 gp->softc = dev; 146 dev->si_drv1 = gp; 147 dev->si_drv2 = cp; 148 return (gp); 149 } 150 151 static int 152 g_dev_open(struct cdev *dev, int flags, int fmt, struct thread *td) 153 { 154 struct g_geom *gp; 155 struct g_consumer *cp; 156 int error, r, w, e; 157 158 gp = dev->si_drv1; 159 cp = dev->si_drv2; 160 if (gp == NULL || cp == NULL || gp->softc != dev) 161 return(ENXIO); /* g_dev_taste() not done yet */ 162 163 g_trace(G_T_ACCESS, "g_dev_open(%s, %d, %d, %p)", 164 gp->name, flags, fmt, td); 165 166 r = flags & FREAD ? 1 : 0; 167 w = flags & FWRITE ? 1 : 0; 168 #ifdef notyet 169 e = flags & O_EXCL ? 1 : 0; 170 #else 171 e = 0; 172 #endif 173 if (w) { 174 /* 175 * When running in very secure mode, do not allow 176 * opens for writing of any disks. 177 */ 178 error = securelevel_ge(td->td_ucred, 2); 179 if (error) 180 return (error); 181 } 182 g_topology_lock(); 183 if (dev->si_devsw == NULL) 184 error = ENXIO; /* We were orphaned */ 185 else 186 error = g_access(cp, r, w, e); 187 g_topology_unlock(); 188 g_waitidle(); 189 if (!error) 190 dev->si_bsize_phys = cp->provider->sectorsize; 191 return(error); 192 } 193 194 static int 195 g_dev_close(struct cdev *dev, int flags, int fmt, struct thread *td) 196 { 197 struct g_geom *gp; 198 struct g_consumer *cp; 199 int error, r, w, e, i; 200 201 gp = dev->si_drv1; 202 cp = dev->si_drv2; 203 if (gp == NULL || cp == NULL) 204 return(ENXIO); 205 g_trace(G_T_ACCESS, "g_dev_close(%s, %d, %d, %p)", 206 gp->name, flags, fmt, td); 207 r = flags & FREAD ? -1 : 0; 208 w = flags & FWRITE ? -1 : 0; 209 #ifdef notyet 210 e = flags & O_EXCL ? -1 : 0; 211 #else 212 e = 0; 213 #endif 214 g_topology_lock(); 215 if (dev->si_devsw == NULL) 216 error = ENXIO; /* We were orphaned */ 217 else 218 error = g_access(cp, r, w, e); 219 for (i = 0; i < 10 * hz;) { 220 if (cp->acr != 0 || cp->acw != 0) 221 break; 222 if (cp->nstart == cp->nend) 223 break; 224 tsleep(&i, PRIBIO, "gdevwclose", hz / 10); 225 i += hz / 10; 226 } 227 if (cp->acr == 0 && cp->acw == 0 && cp->nstart != cp->nend) { 228 printf("WARNING: Final close of geom_dev(%s) %s %s\n", 229 gp->name, 230 "still has outstanding I/O after 10 seconds.", 231 "Completing close anyway, panic may happen later."); 232 } 233 g_topology_unlock(); 234 g_waitidle(); 235 return (error); 236 } 237 238 /* 239 * XXX: Until we have unmessed the ioctl situation, there is a race against 240 * XXX: a concurrent orphanization. We cannot close it by holding topology 241 * XXX: since that would prevent us from doing our job, and stalling events 242 * XXX: will break (actually: stall) the BSD disklabel hacks. 243 */ 244 static int 245 g_dev_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td) 246 { 247 struct g_geom *gp; 248 struct g_consumer *cp; 249 struct g_kerneldump kd; 250 int i, error; 251 u_int u; 252 253 gp = dev->si_drv1; 254 cp = dev->si_drv2; 255 256 error = 0; 257 KASSERT(cp->acr || cp->acw, 258 ("Consumer with zero access count in g_dev_ioctl")); 259 260 i = IOCPARM_LEN(cmd); 261 switch (cmd) { 262 case DIOCGSECTORSIZE: 263 *(u_int *)data = cp->provider->sectorsize; 264 if (*(u_int *)data == 0) 265 error = ENOENT; 266 break; 267 case DIOCGMEDIASIZE: 268 *(off_t *)data = cp->provider->mediasize; 269 if (*(off_t *)data == 0) 270 error = ENOENT; 271 break; 272 case DIOCGFWSECTORS: 273 error = g_io_getattr("GEOM::fwsectors", cp, &i, data); 274 if (error == 0 && *(u_int *)data == 0) 275 error = ENOENT; 276 break; 277 case DIOCGFWHEADS: 278 error = g_io_getattr("GEOM::fwheads", cp, &i, data); 279 if (error == 0 && *(u_int *)data == 0) 280 error = ENOENT; 281 break; 282 case DIOCGFRONTSTUFF: 283 error = g_io_getattr("GEOM::frontstuff", cp, &i, data); 284 break; 285 case DIOCSKERNELDUMP: 286 u = *((u_int *)data); 287 if (!u) { 288 set_dumper(NULL); 289 error = 0; 290 break; 291 } 292 kd.offset = 0; 293 kd.length = OFF_MAX; 294 i = sizeof kd; 295 error = g_io_getattr("GEOM::kerneldump", cp, &i, &kd); 296 if (!error) 297 dev->si_flags |= SI_DUMPDEV; 298 break; 299 300 default: 301 if (cp->provider->geom->ioctl != NULL) { 302 error = cp->provider->geom->ioctl(cp->provider, cmd, data, td); 303 } else { 304 error = ENOIOCTL; 305 } 306 } 307 308 g_waitidle(); 309 return (error); 310 } 311 312 static void 313 g_dev_done(struct bio *bp2) 314 { 315 struct bio *bp; 316 317 bp = bp2->bio_parent; 318 bp->bio_error = bp2->bio_error; 319 if (bp->bio_error != 0) { 320 g_trace(G_T_BIO, "g_dev_done(%p) had error %d", 321 bp2, bp->bio_error); 322 bp->bio_flags |= BIO_ERROR; 323 } else { 324 g_trace(G_T_BIO, "g_dev_done(%p/%p) resid %ld completed %jd", 325 bp2, bp, bp->bio_resid, (intmax_t)bp2->bio_completed); 326 } 327 bp->bio_resid = bp->bio_bcount - bp2->bio_completed; 328 g_destroy_bio(bp2); 329 biodone(bp); 330 } 331 332 static void 333 g_dev_strategy(struct bio *bp) 334 { 335 struct g_consumer *cp; 336 struct bio *bp2; 337 struct cdev *dev; 338 339 KASSERT(bp->bio_cmd == BIO_READ || 340 bp->bio_cmd == BIO_WRITE || 341 bp->bio_cmd == BIO_DELETE, 342 ("Wrong bio_cmd bio=%p cmd=%d", bp, bp->bio_cmd)); 343 dev = bp->bio_dev; 344 cp = dev->si_drv2; 345 KASSERT(cp->acr || cp->acw, 346 ("Consumer with zero access count in g_dev_strategy")); 347 348 if ((bp->bio_offset % cp->provider->sectorsize) != 0 || 349 (bp->bio_bcount % cp->provider->sectorsize) != 0) { 350 biofinish(bp, NULL, EINVAL); 351 return; 352 } 353 354 for (;;) { 355 /* 356 * XXX: This is not an ideal solution, but I belive it to 357 * XXX: deadlock safe, all things considered. 358 */ 359 bp2 = g_clone_bio(bp); 360 if (bp2 != NULL) 361 break; 362 tsleep(&bp, PRIBIO, "gdstrat", hz / 10); 363 } 364 KASSERT(bp2 != NULL, ("XXX: ENOMEM in a bad place")); 365 bp2->bio_length = (off_t)bp->bio_bcount; 366 bp2->bio_done = g_dev_done; 367 g_trace(G_T_BIO, 368 "g_dev_strategy(%p/%p) offset %jd length %jd data %p cmd %d", 369 bp, bp2, (intmax_t)bp->bio_offset, (intmax_t)bp2->bio_length, 370 bp2->bio_data, bp2->bio_cmd); 371 g_io_request(bp2, cp); 372 KASSERT(cp->acr || cp->acw, 373 ("g_dev_strategy raced with g_dev_close and lost")); 374 375 } 376 377 /* 378 * g_dev_orphan() 379 * 380 * Called from below when the provider orphaned us. 381 * - Clear any dump settings. 382 * - Destroy the struct cdev *to prevent any more request from coming in. The 383 * provider is already marked with an error, so anything which comes in 384 * in the interrim will be returned immediately. 385 * - Wait for any outstanding I/O to finish. 386 * - Set our access counts to zero, whatever they were. 387 * - Detach and self-destruct. 388 */ 389 390 static void 391 g_dev_orphan(struct g_consumer *cp) 392 { 393 struct g_geom *gp; 394 struct cdev *dev; 395 396 g_topology_assert(); 397 gp = cp->geom; 398 dev = gp->softc; 399 g_trace(G_T_TOPOLOGY, "g_dev_orphan(%p(%s))", cp, gp->name); 400 401 /* Reset any dump-area set on this device */ 402 if (dev->si_flags & SI_DUMPDEV) 403 set_dumper(NULL); 404 405 /* Destroy the struct cdev *so we get no more requests */ 406 destroy_dev(dev); 407 408 /* Wait for the cows to come home */ 409 while (cp->nstart != cp->nend) 410 msleep(&dev, NULL, PRIBIO, "gdevorphan", hz / 10); 411 412 if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0) 413 g_access(cp, -cp->acr, -cp->acw, -cp->ace); 414 415 g_detach(cp); 416 g_destroy_consumer(cp); 417 g_destroy_geom(gp); 418 } 419 420 DECLARE_GEOM_CLASS(g_dev_class, g_dev);
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