geom_slice.c revision 107953
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_slice.c 107953 2002-12-16 22:33:27Z phk $ 36 */ 37 38 39#include <sys/param.h> 40#include <sys/stdint.h> 41#ifndef _KERNEL 42#include <stdio.h> 43#include <unistd.h> 44#include <stdlib.h> 45#include <signal.h> 46#include <string.h> 47#include <err.h> 48#else 49#include <sys/systm.h> 50#include <sys/kernel.h> 51#include <sys/malloc.h> 52#include <sys/bio.h> 53#include <sys/sysctl.h> 54#include <sys/proc.h> 55#include <sys/kthread.h> 56#include <sys/lock.h> 57#include <sys/mutex.h> 58#endif 59#include <sys/errno.h> 60#include <sys/sbuf.h> 61#include <geom/geom.h> 62#include <geom/geom_slice.h> 63#include <machine/stdarg.h> 64 65static g_orphan_t g_slice_orphan; 66static g_access_t g_slice_access; 67static g_start_t g_slice_start; 68 69static struct g_slicer * 70g_slice_init(unsigned nslice, unsigned scsize) 71{ 72 struct g_slicer *gsp; 73 74 gsp = g_malloc(sizeof *gsp, M_WAITOK | M_ZERO); 75 gsp->softc = g_malloc(scsize, M_WAITOK | M_ZERO); 76 gsp->slices = g_malloc(nslice * sizeof(struct g_slice), 77 M_WAITOK | M_ZERO); 78 gsp->nslice = nslice; 79 return (gsp); 80} 81 82static int 83g_slice_access(struct g_provider *pp, int dr, int dw, int de) 84{ 85 int error; 86 u_int u; 87 struct g_geom *gp; 88 struct g_consumer *cp; 89 struct g_provider *pp2; 90 struct g_slicer *gsp; 91 struct g_slice *gsl, *gsl2; 92 93 gp = pp->geom; 94 cp = LIST_FIRST(&gp->consumer); 95 KASSERT (cp != NULL, ("g_slice_access but no consumer")); 96 gsp = gp->softc; 97 gsl = &gsp->slices[pp->index]; 98 for (u = 0; u < gsp->nslice; u++) { 99 gsl2 = &gsp->slices[u]; 100 if (gsl2->length == 0) 101 continue; 102 if (u == pp->index) 103 continue; 104 if (gsl->offset + gsl->length <= gsl2->offset) 105 continue; 106 if (gsl2->offset + gsl2->length <= gsl->offset) 107 continue; 108 /* overlap */ 109 pp2 = gsl2->provider; 110 if ((pp->acw + dw) > 0 && pp2->ace > 0) 111 return (EPERM); 112 if ((pp->ace + de) > 0 && pp2->acw > 0) 113 return (EPERM); 114 } 115 /* On first open, grab an extra "exclusive" bit */ 116 if (cp->acr == 0 && cp->acw == 0 && cp->ace == 0) 117 de++; 118 /* ... and let go of it on last close */ 119 if ((cp->acr + dr) == 0 && (cp->acw + dw) == 0 && (cp->ace + de) == 1) 120 de--; 121 error = g_access_rel(cp, dr, dw, de); 122 return (error); 123} 124 125void 126g_slice_finish_hot(struct bio *bp) 127{ 128 struct bio *bp2; 129 struct g_geom *gp; 130 struct g_consumer *cp; 131 struct g_slicer *gsp; 132 struct g_slice *gsl; 133 int idx; 134 135 KASSERT(bp->bio_to != NULL, ("NULL bio_to in g_slice_finish_hot(%p)", bp)); 136 KASSERT(bp->bio_from != NULL, ("NULL bio_from in g_slice_finish_hot(%p)", bp)); 137 gp = bp->bio_to->geom; 138 gsp = gp->softc; 139 cp = LIST_FIRST(&gp->consumer); 140 KASSERT(cp != NULL, ("NULL consumer in g_slice_finish_hot(%p)", bp)); 141 idx = bp->bio_to->index; 142 gsl = &gsp->slices[idx]; 143 144 bp2 = g_clone_bio(bp); 145 if (bp2 == NULL) { 146 g_io_deliver(bp, ENOMEM); 147 return; 148 } 149 if (bp2->bio_offset + bp2->bio_length > gsl->length) 150 bp2->bio_length = gsl->length - bp2->bio_offset; 151 bp2->bio_done = g_std_done; 152 bp2->bio_offset += gsl->offset; 153 g_io_request(bp2, cp); 154 return; 155} 156 157static void 158g_slice_start(struct bio *bp) 159{ 160 struct bio *bp2; 161 struct g_provider *pp; 162 struct g_geom *gp; 163 struct g_consumer *cp; 164 struct g_slicer *gsp; 165 struct g_slice *gsl, *gmp; 166 int idx, error; 167 u_int m_index; 168 off_t t; 169 170 pp = bp->bio_to; 171 gp = pp->geom; 172 gsp = gp->softc; 173 cp = LIST_FIRST(&gp->consumer); 174 idx = pp->index; 175 gsl = &gsp->slices[idx]; 176 switch(bp->bio_cmd) { 177 case BIO_READ: 178 case BIO_WRITE: 179 case BIO_DELETE: 180 if (bp->bio_offset > gsl->length) { 181 g_io_deliver(bp, EINVAL); /* XXX: EWHAT ? */ 182 return; 183 } 184 /* 185 * Check if we collide with any hot spaces, and call the 186 * method once if so. 187 */ 188 t = bp->bio_offset + gsl->offset; 189 for (m_index = 0; m_index < gsp->nhot; m_index++) { 190 gmp = &gsp->hot[m_index]; 191 if (t >= gmp->offset + gmp->length) 192 continue; 193 if (t + bp->bio_length <= gmp->offset) 194 continue; 195 error = gsp->start(bp); 196 if (error == EJUSTRETURN) 197 return; 198 else if (error) { 199 g_io_deliver(bp, error); 200 return; 201 } 202 break; 203 } 204 bp2 = g_clone_bio(bp); 205 if (bp2 == NULL) { 206 g_io_deliver(bp, ENOMEM); 207 return; 208 } 209 if (bp2->bio_offset + bp2->bio_length > gsl->length) 210 bp2->bio_length = gsl->length - bp2->bio_offset; 211 bp2->bio_done = g_std_done; 212 bp2->bio_offset += gsl->offset; 213 g_io_request(bp2, cp); 214 return; 215 case BIO_GETATTR: 216 case BIO_SETATTR: 217 /* Give the real method a chance to override */ 218 if (gsp->start(bp)) 219 return; 220 if (!strcmp("GEOM::frontstuff", bp->bio_attribute)) { 221 t = gsp->cfrontstuff; 222 if (gsp->frontstuff > t) 223 t = gsp->frontstuff; 224 t -= gsl->offset; 225 if (t < 0) 226 t = 0; 227 if (t > gsl->length) 228 t = gsl->length; 229 g_handleattr_off_t(bp, "GEOM::frontstuff", t); 230 return; 231 } 232#ifdef _KERNEL 233 if (!strcmp("GEOM::kerneldump", bp->bio_attribute)) { 234 struct g_kerneldump *gkd; 235 236 gkd = (struct g_kerneldump *)bp->bio_data; 237 gkd->offset += gsp->slices[idx].offset; 238 if (gkd->length > gsp->slices[idx].length) 239 gkd->length = gsp->slices[idx].length; 240 /* now, pass it on downwards... */ 241 } 242#endif 243 bp2 = g_clone_bio(bp); 244 if (bp2 == NULL) { 245 g_io_deliver(bp, ENOMEM); 246 return; 247 } 248 bp2->bio_done = g_std_done; 249 g_io_request(bp2, cp); 250 break; 251 default: 252 g_io_deliver(bp, EOPNOTSUPP); 253 return; 254 } 255} 256 257void 258g_slice_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp) 259{ 260 struct g_slicer *gsp; 261 262 gsp = gp->softc; 263 if (indent == NULL) { 264 sbuf_printf(sb, " i %u", pp->index); 265 sbuf_printf(sb, " o %ju", 266 (uintmax_t)gsp->slices[pp->index].offset); 267 return; 268 } 269 if (gp != NULL && (pp == NULL && cp == NULL)) { 270 sbuf_printf(sb, "%s<frontstuff>%ju</frontstuff>\n", 271 indent, (intmax_t)gsp->frontstuff); 272 } 273 if (pp != NULL) { 274 sbuf_printf(sb, "%s<index>%u</index>\n", indent, pp->index); 275 sbuf_printf(sb, "%s<length>%ju</length>\n", 276 indent, (uintmax_t)gsp->slices[pp->index].length); 277 sbuf_printf(sb, "%s<seclength>%ju</seclength>\n", indent, 278 (uintmax_t)gsp->slices[pp->index].length / 512); 279 sbuf_printf(sb, "%s<offset>%ju</offset>\n", indent, 280 (uintmax_t)gsp->slices[pp->index].offset); 281 sbuf_printf(sb, "%s<secoffset>%ju</secoffset>\n", indent, 282 (uintmax_t)gsp->slices[pp->index].offset / 512); 283 } 284} 285 286int 287g_slice_config(struct g_geom *gp, u_int idx, int how, off_t offset, off_t length, u_int sectorsize, const char *fmt, ...) 288{ 289 struct g_provider *pp; 290 struct g_slicer *gsp; 291 struct g_slice *gsl; 292 va_list ap; 293 struct sbuf *sb; 294 int error, acc; 295 296 g_trace(G_T_TOPOLOGY, "g_slice_config(%s, %d, %d)", 297 gp->name, idx, how); 298 g_topology_assert(); 299 gsp = gp->softc; 300 error = 0; 301 if (idx >= gsp->nslice) 302 return(EINVAL); 303 gsl = &gsp->slices[idx]; 304 pp = gsl->provider; 305 if (pp != NULL) 306 acc = pp->acr + pp->acw + pp->ace; 307 else 308 acc = 0; 309 if (acc != 0 && how != G_SLICE_CONFIG_FORCE) { 310 if (length < gsl->length) 311 return(EBUSY); 312 if (offset != gsl->offset) 313 return(EBUSY); 314 } 315 /* XXX: check offset + length <= MEDIASIZE */ 316 if (how == G_SLICE_CONFIG_CHECK) 317 return (0); 318 gsl->length = length; 319 gsl->offset = offset; 320 gsl->sectorsize = sectorsize; 321 if (length == 0) { 322 if (pp == NULL) 323 return (0); 324 if (bootverbose) 325 printf("GEOM: Deconfigure %s\n", pp->name); 326 g_orphan_provider(pp, ENXIO); 327 gsl->provider = NULL; 328 gsp->nprovider--; 329 return (0); 330 } 331 if (pp != NULL) { 332 if (bootverbose) 333 printf("GEOM: Reconfigure %s, start %jd length %jd end %jd\n", 334 pp->name, (intmax_t)offset, (intmax_t)length, 335 (intmax_t)(offset + length - 1)); 336 pp->mediasize = gsl->length; 337 return (0); 338 } 339 va_start(ap, fmt); 340 sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND); 341 sbuf_vprintf(sb, fmt, ap); 342 sbuf_finish(sb); 343 pp = g_new_providerf(gp, sbuf_data(sb)); 344 if (bootverbose) 345 printf("GEOM: Configure %s, start %jd length %jd end %jd\n", 346 pp->name, (intmax_t)offset, (intmax_t)length, 347 (intmax_t)(offset + length - 1)); 348 pp->index = idx; 349 pp->mediasize = gsl->length; 350 pp->sectorsize = gsl->sectorsize; 351 gsl->provider = pp; 352 gsp->nprovider++; 353 g_error_provider(pp, 0); 354 sbuf_delete(sb); 355 return(0); 356} 357 358int 359g_slice_conf_hot(struct g_geom *gp, u_int idx, off_t offset, off_t length) 360{ 361 struct g_slicer *gsp; 362 struct g_slice *gsl, *gsl2; 363 364 g_trace(G_T_TOPOLOGY, "g_slice_conf_hot()"); 365 g_topology_assert(); 366 gsp = gp->softc; 367 gsl = gsp->hot; 368 if(idx >= gsp->nhot) { 369 gsl2 = g_malloc((idx + 1) * sizeof *gsl2, M_WAITOK | M_ZERO); 370 if (gsp->hot != NULL) 371 bcopy(gsp->hot, gsl2, gsp->nhot * sizeof *gsl2); 372 gsp->hot = gsl2; 373 if (gsp->hot != NULL) 374 g_free(gsl); 375 gsl = gsl2; 376 gsp->nhot = idx + 1; 377 } 378 if (bootverbose) 379 printf("GEOM: Add %s hot[%d] start %jd length %jd end %jd\n", 380 gp->name, idx, (intmax_t)offset, (intmax_t)length, 381 (intmax_t)(offset + length - 1)); 382 gsl[idx].offset = offset; 383 gsl[idx].length = length; 384 return (0); 385} 386 387struct g_provider * 388g_slice_addslice(struct g_geom *gp, int idx, off_t offset, off_t length, u_int sectorsize, const char *fmt, ...) 389{ 390 struct g_provider *pp; 391 struct g_slicer *gsp; 392 va_list ap; 393 struct sbuf *sb; 394 395 g_trace(G_T_TOPOLOGY, "g_slice_addslice()"); 396 g_topology_assert(); 397 gsp = gp->softc; 398 va_start(ap, fmt); 399 sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND); 400 sbuf_vprintf(sb, fmt, ap); 401 sbuf_finish(sb); 402 pp = g_new_providerf(gp, sbuf_data(sb)); 403 404 pp->index = idx; 405 gsp->slices[idx].length = length; 406 gsp->slices[idx].offset = offset; 407 gsp->slices[idx].provider = pp; 408 gsp->slices[idx].sectorsize = sectorsize; 409 pp->mediasize = gsp->slices[idx].length; 410 pp->sectorsize = gsp->slices[idx].sectorsize; 411 sbuf_delete(sb); 412 if (bootverbose) 413 printf("GEOM: Add %s, start %jd length %jd end %jd\n", 414 pp->name, (intmax_t)offset, (intmax_t)length, 415 (intmax_t)(offset + length - 1)); 416 return(pp); 417} 418 419struct g_geom * 420g_slice_new(struct g_class *mp, u_int slices, struct g_provider *pp, struct g_consumer **cpp, void *extrap, int extra, g_slice_start_t *start) 421{ 422 struct g_geom *gp; 423 struct g_slicer *gsp; 424 struct g_consumer *cp; 425 void **vp; 426 int error, i; 427 428 g_topology_assert(); 429 vp = (void **)extrap; 430 gp = g_new_geomf(mp, "%s", pp->name); 431 gsp = g_slice_init(slices, extra); 432 gsp->start = start; 433 gp->access = g_slice_access; 434 gp->orphan = g_slice_orphan; 435 gp->softc = gsp; 436 gp->start = g_slice_start; 437 gp->spoiled = g_std_spoiled; 438 gp->dumpconf = g_slice_dumpconf; 439 cp = g_new_consumer(gp); 440 error = g_attach(cp, pp); 441 if (error == 0) 442 error = g_access_rel(cp, 1, 0, 0); 443 if (error) { 444 if (cp->provider != NULL) 445 g_detach(cp); 446 g_destroy_consumer(cp); 447 g_free(gsp->slices); 448 g_free(gp->softc); 449 g_destroy_geom(gp); 450 return (NULL); 451 } 452 /* Find out if there are any magic bytes on the consumer */ 453 i = sizeof gsp->cfrontstuff; 454 error = g_io_getattr("GEOM::frontstuff", cp, &i, &gsp->cfrontstuff); 455 if (error) 456 gsp->cfrontstuff = 0; 457 *vp = gsp->softc; 458 *cpp = cp; 459 return (gp); 460} 461 462static void 463g_slice_orphan(struct g_consumer *cp) 464{ 465 struct g_geom *gp; 466 struct g_provider *pp; 467 int error; 468 469 g_trace(G_T_TOPOLOGY, "g_slice_orphan(%p/%s)", cp, cp->provider->name); 470 g_topology_assert(); 471 KASSERT(cp->provider->error != 0, 472 ("g_slice_orphan with error == 0")); 473 474 gp = cp->geom; 475 /* XXX: Not good enough we leak the softc and its suballocations */ 476 gp->flags |= G_GEOM_WITHER; 477 error = cp->provider->error; 478 LIST_FOREACH(pp, &gp->provider, provider) 479 g_orphan_provider(pp, error); 480 return; 481} 482