geom_slice.c revision 106101
1183370Simp/*- 2183370Simp * Copyright (c) 2002 Poul-Henning Kamp 3183370Simp * Copyright (c) 2002 Networks Associates Technology, Inc. 4183370Simp * All rights reserved. 5183370Simp * 6183370Simp * This software was developed for the FreeBSD Project by Poul-Henning Kamp 7183370Simp * and NAI Labs, the Security Research Division of Network Associates, Inc. 8183370Simp * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the 9183370Simp * DARPA CHATS research program. 10183370Simp * 11183370Simp * Redistribution and use in source and binary forms, with or without 12183370Simp * modification, are permitted provided that the following conditions 13183370Simp * are met: 14183370Simp * 1. Redistributions of source code must retain the above copyright 15183370Simp * notice, this list of conditions and the following disclaimer. 16183370Simp * 2. Redistributions in binary form must reproduce the above copyright 17183370Simp * notice, this list of conditions and the following disclaimer in the 18183370Simp * documentation and/or other materials provided with the distribution. 19183370Simp * 3. The names of the authors may not be used to endorse or promote 20183370Simp * products derived from this software without specific prior written 21183370Simp * permission. 22183370Simp * 23183370Simp * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 24183370Simp * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25183370Simp * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26183370Simp * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 27183370Simp * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28183370Simp * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29183370Simp * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30183370Simp * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31183370Simp * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32183370Simp * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33183370Simp * SUCH DAMAGE. 34183370Simp * 35183370Simp * $FreeBSD: head/sys/geom/geom_slice.c 106101 2002-10-28 22:43:54Z phk $ 36183370Simp */ 37183370Simp 38183370Simp 39183370Simp#include <sys/param.h> 40183370Simp#include <sys/stdint.h> 41183370Simp#ifndef _KERNEL 42183370Simp#include <stdio.h> 43183370Simp#include <unistd.h> 44183370Simp#include <stdlib.h> 45183370Simp#include <signal.h> 46183370Simp#include <string.h> 47183370Simp#include <err.h> 48183370Simp#else 49183370Simp#include <sys/systm.h> 50183370Simp#include <sys/kernel.h> 51183370Simp#include <sys/malloc.h> 52183370Simp#include <sys/bio.h> 53183370Simp#include <sys/sysctl.h> 54183370Simp#include <sys/proc.h> 55183370Simp#include <sys/kthread.h> 56183370Simp#include <sys/lock.h> 57183370Simp#include <sys/mutex.h> 58183370Simp#endif 59183370Simp#include <sys/errno.h> 60183370Simp#include <sys/sbuf.h> 61183370Simp#include <geom/geom.h> 62183370Simp#include <geom/geom_slice.h> 63183370Simp#include <machine/stdarg.h> 64183370Simp 65183370Simpstatic g_orphan_t g_slice_orphan; 66183370Simpstatic g_access_t g_slice_access; 67183370Simpstatic g_start_t g_slice_start; 68183370Simp 69183370Simpstatic struct g_slicer * 70183370Simpg_slice_init(unsigned nslice, unsigned scsize) 71183370Simp{ 72183370Simp struct g_slicer *gsp; 73183370Simp 74183370Simp gsp = g_malloc(sizeof *gsp, M_WAITOK | M_ZERO); 75183370Simp gsp->softc = g_malloc(scsize, M_WAITOK | M_ZERO); 76183370Simp gsp->slices = g_malloc(nslice * sizeof(struct g_slice), 77183370Simp M_WAITOK | M_ZERO); 78183370Simp gsp->nslice = nslice; 79183370Simp return (gsp); 80183370Simp} 81183370Simp 82183370Simpstatic int 83183370Simpg_slice_access(struct g_provider *pp, int dr, int dw, int de) 84183370Simp{ 85183370Simp int error, i; 86183370Simp struct g_geom *gp; 87183370Simp struct g_consumer *cp; 88183370Simp struct g_provider *pp2; 89183370Simp struct g_slicer *gsp; 90183370Simp struct g_slice *gsl, *gsl2; 91183370Simp 92183370Simp gp = pp->geom; 93183370Simp cp = LIST_FIRST(&gp->consumer); 94183370Simp KASSERT (cp != NULL, ("g_slice_access but no consumer")); 95183370Simp gsp = gp->softc; 96183370Simp gsl = &gsp->slices[pp->index]; 97183370Simp for (i = 0; i < gsp->nslice; i++) { 98183370Simp gsl2 = &gsp->slices[i]; 99183370Simp if (gsl2->length == 0) 100183370Simp continue; 101183370Simp if (i == pp->index) 102183370Simp continue; 103183370Simp if (gsl->offset + gsl->length <= gsl2->offset) 104183370Simp continue; 105 if (gsl2->offset + gsl2->length <= gsl->offset) 106 continue; 107 /* overlap */ 108 pp2 = gsl2->provider; 109 if ((pp->acw + dw) > 0 && pp2->ace > 0) 110 return (EPERM); 111 if ((pp->ace + de) > 0 && pp2->acw > 0) 112 return (EPERM); 113 } 114 /* On first open, grab an extra "exclusive" bit */ 115 if (cp->acr == 0 && cp->acw == 0 && cp->ace == 0) 116 de++; 117 /* ... and let go of it on last close */ 118 if ((cp->acr + dr) == 0 && (cp->acw + dw) == 0 && (cp->ace + de) == 1) 119 de--; 120 error = g_access_rel(cp, dr, dw, de); 121 return (error); 122} 123 124static void 125g_slice_start(struct bio *bp) 126{ 127 struct bio *bp2; 128 struct g_provider *pp; 129 struct g_geom *gp; 130 struct g_consumer *cp; 131 struct g_slicer *gsp; 132 struct g_slice *gsl; 133 int index; 134 off_t t; 135 136 pp = bp->bio_to; 137 gp = pp->geom; 138 gsp = gp->softc; 139 cp = LIST_FIRST(&gp->consumer); 140 index = pp->index; 141 gsl = &gsp->slices[index]; 142 switch(bp->bio_cmd) { 143 case BIO_READ: 144 case BIO_WRITE: 145 case BIO_DELETE: 146 if (bp->bio_offset > gsl->length) { 147 g_io_deliver(bp, EINVAL); /* XXX: EWHAT ? */ 148 return; 149 } 150 bp2 = g_clone_bio(bp); 151 if (bp2 == NULL) { 152 g_io_deliver(bp, ENOMEM); 153 return; 154 } 155 if (bp2->bio_offset + bp2->bio_length > gsl->length) 156 bp2->bio_length = gsl->length - bp2->bio_offset; 157 bp2->bio_done = g_std_done; 158 bp2->bio_offset += gsl->offset; 159 g_io_request(bp2, cp); 160 return; 161 case BIO_GETATTR: 162 case BIO_SETATTR: 163 /* Give the real method a chance to override */ 164 if (gsp->start(bp)) 165 return; 166 if (!strcmp("GEOM::frontstuff", bp->bio_attribute)) { 167 t = gsp->cfrontstuff; 168 if (gsp->frontstuff > t) 169 t = gsp->frontstuff; 170 t -= gsl->offset; 171 if (t < 0) 172 t = 0; 173 if (t > gsl->length) 174 t = gsl->length; 175 g_handleattr_off_t(bp, "GEOM::frontstuff", t); 176 return; 177 } 178#ifdef _KERNEL 179 if (!strcmp("GEOM::kerneldump", bp->bio_attribute)) { 180 struct g_kerneldump *gkd; 181 182 gkd = (struct g_kerneldump *)bp->bio_data; 183 gkd->offset += gsp->slices[index].offset; 184 if (gkd->length > gsp->slices[index].length) 185 gkd->length = gsp->slices[index].length; 186 /* now, pass it on downwards... */ 187 } 188#endif 189 bp2 = g_clone_bio(bp); 190 if (bp2 == NULL) { 191 g_io_deliver(bp, ENOMEM); 192 return; 193 } 194 bp2->bio_done = g_std_done; 195 g_io_request(bp2, cp); 196 break; 197 default: 198 g_io_deliver(bp, EOPNOTSUPP); 199 return; 200 } 201} 202 203void 204g_slice_dumpconf(struct sbuf *sb, char *indent, struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp) 205{ 206 struct g_slicer *gsp; 207 208 gsp = gp->softc; 209 if (indent == NULL) { 210 sbuf_printf(sb, " i %u", pp->index); 211 sbuf_printf(sb, " o %ju", 212 (uintmax_t)gsp->slices[pp->index].offset); 213 return; 214 } 215 if (gp != NULL && (pp == NULL && cp == NULL)) { 216 sbuf_printf(sb, "%s<frontstuff>%ju</frontstuff>\n", 217 indent, (intmax_t)gsp->frontstuff); 218 } 219 if (pp != NULL) { 220 sbuf_printf(sb, "%s<index>%u</index>\n", indent, pp->index); 221 sbuf_printf(sb, "%s<length>%ju</length>\n", 222 indent, (uintmax_t)gsp->slices[pp->index].length); 223 sbuf_printf(sb, "%s<seclength>%ju</seclength>\n", indent, 224 (uintmax_t)gsp->slices[pp->index].length / 512); 225 sbuf_printf(sb, "%s<offset>%ju</offset>\n", indent, 226 (uintmax_t)gsp->slices[pp->index].offset); 227 sbuf_printf(sb, "%s<secoffset>%ju</secoffset>\n", indent, 228 (uintmax_t)gsp->slices[pp->index].offset / 512); 229 } 230} 231 232int 233g_slice_config(struct g_geom *gp, int index, int how, off_t offset, off_t length, u_int sectorsize, char *fmt, ...) 234{ 235 struct g_provider *pp; 236 struct g_slicer *gsp; 237 struct g_slice *gsl; 238 va_list ap; 239 struct sbuf *sb; 240 int error, acc; 241 242 g_trace(G_T_TOPOLOGY, "g_slice_config(%s, %d, %d)", 243 gp->name, index, how); 244 g_topology_assert(); 245 gsp = gp->softc; 246 error = 0; 247 if (index >= gsp->nslice) 248 return(EINVAL); 249 gsl = &gsp->slices[index]; 250 pp = gsl->provider; 251 if (pp != NULL) 252 acc = pp->acr + pp->acw + pp->ace; 253 else 254 acc = 0; 255 if (acc != 0 && how != G_SLICE_CONFIG_FORCE) { 256 if (length < gsl->length) 257 return(EBUSY); 258 if (offset != gsl->offset) 259 return(EBUSY); 260 } 261 /* XXX: check offset + length <= MEDIASIZE */ 262 if (how == G_SLICE_CONFIG_CHECK) 263 return (0); 264 gsl->length = length; 265 gsl->offset = offset; 266 gsl->sectorsize = sectorsize; 267 if (length == 0) { 268 if (pp == NULL) 269 return (0); 270 if (bootverbose) 271 printf("GEOM: Deconfigure %s\n", pp->name); 272 g_orphan_provider(pp, ENXIO); 273 gsl->provider = NULL; 274 gsp->nprovider--; 275 return (0); 276 } 277 if (pp != NULL) { 278 if (bootverbose) 279 printf("GEOM: Reconfigure %s, start %jd length %jd end %jd\n", 280 pp->name, (intmax_t)offset, (intmax_t)length, 281 (intmax_t)(offset + length - 1)); 282 return (0); 283 } 284 va_start(ap, fmt); 285 sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND); 286 sbuf_vprintf(sb, fmt, ap); 287 sbuf_finish(sb); 288 pp = g_new_providerf(gp, sbuf_data(sb)); 289 if (bootverbose) 290 printf("GEOM: Configure %s, start %jd length %jd end %jd\n", 291 pp->name, (intmax_t)offset, (intmax_t)length, 292 (intmax_t)(offset + length - 1)); 293 pp->index = index; 294 pp->mediasize = gsl->length; 295 pp->sectorsize = gsl->sectorsize; 296 gsl->provider = pp; 297 gsp->nprovider++; 298 g_error_provider(pp, 0); 299 sbuf_delete(sb); 300 return(0); 301} 302 303struct g_provider * 304g_slice_addslice(struct g_geom *gp, int index, off_t offset, off_t length, u_int sectorsize, char *fmt, ...) 305{ 306 struct g_provider *pp; 307 struct g_slicer *gsp; 308 va_list ap; 309 struct sbuf *sb; 310 311 g_trace(G_T_TOPOLOGY, "g_slice_addslice()"); 312 g_topology_assert(); 313 gsp = gp->softc; 314 va_start(ap, fmt); 315 sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND); 316 sbuf_vprintf(sb, fmt, ap); 317 sbuf_finish(sb); 318 pp = g_new_providerf(gp, sbuf_data(sb)); 319 320 pp->index = index; 321 gsp->slices[index].length = length; 322 gsp->slices[index].offset = offset; 323 gsp->slices[index].provider = pp; 324 gsp->slices[index].sectorsize = sectorsize; 325 pp->mediasize = gsp->slices[index].length; 326 pp->sectorsize = gsp->slices[index].sectorsize; 327 sbuf_delete(sb); 328 if (bootverbose) 329 printf("GEOM: Add %s, start %jd length %jd end %jd\n", 330 pp->name, (intmax_t)offset, (intmax_t)length, 331 (intmax_t)(offset + length - 1)); 332 return(pp); 333} 334 335struct g_geom * 336g_slice_new(struct g_class *mp, int slices, struct g_provider *pp, struct g_consumer **cpp, void *extrap, int extra, g_slice_start_t *start) 337{ 338 struct g_geom *gp; 339 struct g_slicer *gsp; 340 struct g_consumer *cp; 341 void **vp; 342 int error, i; 343 344 g_topology_assert(); 345 vp = (void **)extrap; 346 gp = g_new_geomf(mp, "%s", pp->name); 347 gsp = g_slice_init(slices, extra); 348 gsp->start = start; 349 gp->access = g_slice_access; 350 gp->orphan = g_slice_orphan; 351 gp->softc = gsp; 352 gp->start = g_slice_start; 353 gp->spoiled = g_std_spoiled; 354 gp->dumpconf = g_slice_dumpconf; 355 cp = g_new_consumer(gp); 356 error = g_attach(cp, pp); 357 if (error == 0) 358 error = g_access_rel(cp, 1, 0, 0); 359 if (error) { 360 if (cp->provider != NULL) 361 g_detach(cp); 362 g_destroy_consumer(cp); 363 g_free(gsp->slices); 364 g_free(gp->softc); 365 g_destroy_geom(gp); 366 return (NULL); 367 } 368 /* Find out if there are any magic bytes on the consumer */ 369 i = sizeof gsp->cfrontstuff; 370 error = g_io_getattr("GEOM::frontstuff", cp, &i, &gsp->cfrontstuff); 371 if (error) 372 gsp->cfrontstuff = 0; 373 *vp = gsp->softc; 374 *cpp = cp; 375 return (gp); 376} 377 378static void 379g_slice_orphan(struct g_consumer *cp) 380{ 381 struct g_geom *gp; 382 struct g_provider *pp; 383 int error; 384 385 g_trace(G_T_TOPOLOGY, "g_slice_orphan(%p/%s)", cp, cp->provider->name); 386 g_topology_assert(); 387 KASSERT(cp->provider->error != 0, 388 ("g_slice_orphan with error == 0")); 389 390 gp = cp->geom; 391 gp->flags |= G_GEOM_WITHER; 392 error = cp->provider->error; 393 LIST_FOREACH(pp, &gp->provider, provider) 394 g_orphan_provider(pp, error); 395 return; 396} 397