geom_dev.c revision 94175
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 94175 2002-04-08 08:00:40Z 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_CLASS_INITSTUFF 84}; 85 86static void 87g_dev_clone(void *arg, char *name, int namelen, dev_t *dev) 88{ 89 struct g_geom *gp; 90 91 if (*dev != NODEV) 92 return; 93 94 g_trace(G_T_TOPOLOGY, "g_dev_clone(%s)", name); 95 g_rattle(); 96 97 /* XXX: can I drop Giant here ??? */ 98 /* g_topology_lock(); */ 99 LIST_FOREACH(gp, &g_dev_class.geom, geom) { 100 if (strcmp(gp->name, name)) 101 continue; 102 *dev = gp->softc; 103 g_trace(G_T_TOPOLOGY, "g_dev_clone(%s) = %p", name, *dev); 104 return; 105 } 106 /* g_topology_unlock(); */ 107 return; 108} 109 110static void 111g_dev_register_cloner(void *foo __unused) 112{ 113 static int once; 114 115 if (!once) { 116 if (!once) 117 EVENTHANDLER_REGISTER(dev_clone, g_dev_clone, 0, 1000); 118 once++; 119 } 120} 121 122SYSINIT(geomdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE,g_dev_register_cloner,NULL); 123 124static struct g_geom * 125g_dev_taste(struct g_class *mp, struct g_provider *pp, int insist __unused) 126{ 127 struct g_geom *gp; 128 struct g_consumer *cp; 129 static int unit; 130 u_int secsize; 131 off_t mediasize; 132 int error, j; 133 dev_t dev; 134 135 g_trace(G_T_TOPOLOGY, "dev_taste(%s,%s)", mp->name, pp->name); 136 g_topology_assert(); 137 LIST_FOREACH(cp, &pp->consumers, consumers) 138 if (cp->geom->class == mp) 139 return (NULL); 140 gp = g_new_geomf(mp, pp->name); 141 gp->orphan = g_dev_orphan; 142 cp = g_new_consumer(gp); 143 g_attach(cp, pp); 144 error = g_access_rel(cp, 1, 0, 0); 145 g_topology_unlock(); 146 if (!error) { 147 j = sizeof secsize; 148 error = g_io_getattr("GEOM::sectorsize", cp, &j, &secsize); 149 if (error) { 150 secsize = 512; 151 printf("g_bsd_taste: error %d Sectors are %d bytes\n", 152 error, secsize); 153 } 154 j = sizeof mediasize; 155 error = g_io_getattr("GEOM::mediasize", cp, &j, &mediasize); 156 if (error) { 157 mediasize = 0; 158 printf("g_error %d Mediasize is %lld bytes\n", 159 error, (long long)mediasize); 160 } 161 g_topology_lock(); 162 g_access_rel(cp, -1, 0, 0); 163 g_topology_unlock(); 164 } else { 165 secsize = 512; 166 mediasize = 0; 167 } 168 mtx_lock(&Giant); 169 if (mediasize != 0) 170 printf("GEOM: \"%s\" %lld bytes in %lld sectors of %u bytes\n", 171 pp->name, (long long)mediasize, 172 (long long)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 default: 266 gio = g_malloc(sizeof *gio, M_WAITOK); 267 gio->cmd = cmd; 268 gio->data = data; 269 gio->fflag = fflag; 270 gio->td = td; 271 i = sizeof *gio; 272 if (cmd & IOC_IN) 273 error = g_io_setattr("GEOM::ioctl", cp, i, gio); 274 else 275 error = g_io_getattr("GEOM::ioctl", cp, &i, gio); 276 g_free(gio); 277 break; 278 } 279 280 if (error != 0 && cmd == DIOCGDVIRGIN) { 281 g_topology_lock(); 282 gp = g_create_geomf("BSD-class", cp->provider, NULL); 283 g_topology_unlock(); 284 } 285 PICKUP_GIANT(); 286 g_rattle(); 287 if (error == ENOIOCTL) { 288 i = IOCGROUP(cmd); 289 printf("IOCTL(0x%lx) \"%s\"", cmd, gp->name); 290 if (i > ' ' && i <= '~') 291 printf(" '%c'", (int)IOCGROUP(cmd)); 292 else 293 printf(" 0x%lx", IOCGROUP(cmd)); 294 printf("/%ld ", cmd & 0xff); 295 if (cmd & IOC_IN) 296 printf("I"); 297 if (cmd & IOC_OUT) 298 printf("O"); 299 printf("(%ld) = ENOIOCTL\n", IOCPARM_LEN(cmd)); 300 error = ENOTTY; 301 } 302 return (error); 303} 304 305static int 306g_dev_psize(dev_t dev) 307{ 308 struct g_consumer *cp; 309 int i, error; 310 off_t mediasize; 311 312 cp = dev->si_drv2; 313 314 i = sizeof mediasize; 315 error = g_io_getattr("GEOM::mediasize", cp, &i, &mediasize); 316 if (error) 317 return (-1); 318 return (mediasize >> DEV_BSHIFT); 319} 320 321static void 322g_dev_done(struct bio *bp2) 323{ 324 struct bio *bp; 325 326 bp = bp2->bio_linkage; 327 bp->bio_error = bp2->bio_error; 328 if (bp->bio_error != 0) { 329 g_trace(G_T_BIO, "g_dev_done(%p) had error %d", 330 bp2, bp->bio_error); 331 bp->bio_flags |= BIO_ERROR; 332 } else { 333 g_trace(G_T_BIO, "g_dev_done(%p/%p) resid %ld completed %lld", 334 bp2, bp, bp->bio_resid, bp2->bio_completed); 335 } 336 bp->bio_resid = bp->bio_bcount - bp2->bio_completed; 337 g_destroy_bio(bp2); 338 mtx_lock(&Giant); 339 biodone(bp); 340 mtx_unlock(&Giant); 341} 342 343static void 344g_dev_strategy(struct bio *bp) 345{ 346 struct g_geom *gp; 347 struct g_consumer *cp; 348 struct bio *bp2; 349 dev_t dev; 350 351 dev = bp->bio_dev; 352 gp = dev->si_drv1; 353 cp = dev->si_drv2; 354 bp2 = g_clone_bio(bp); 355 bp2->bio_offset = (off_t)bp->bio_blkno << DEV_BSHIFT; 356 bp2->bio_length = (off_t)bp->bio_bcount; 357 bp2->bio_done = g_dev_done; 358 g_trace(G_T_BIO, 359 "g_dev_strategy(%p/%p) offset %lld length %lld data %p cmd %d", 360 bp, bp2, bp->bio_offset, bp2->bio_length, bp2->bio_data, 361 bp2->bio_cmd); 362 g_io_request(bp2, cp); 363} 364 365 366static void 367g_dev_orphan(struct g_consumer *cp) 368{ 369 struct g_geom *gp; 370 dev_t dev; 371 372 gp = cp->geom; 373 g_trace(G_T_TOPOLOGY, "g_dev_orphan(%p(%s))", cp, gp->name); 374 g_topology_assert(); 375 if (cp->biocount > 0) 376 return; 377 dev = gp->softc; 378 destroy_dev(dev); 379 if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0) 380 g_access_rel(cp, -cp->acr, -cp->acw, -cp->ace); 381 g_dettach(cp); 382 g_destroy_consumer(cp); 383 g_destroy_geom(gp); 384} 385 386DECLARE_GEOM_CLASS(g_dev_class, g_dev) 387 388