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>
|
38 39#include "opt_geom.h" 40 41#include <sys/param.h> 42#include <sys/systm.h> 43#include <sys/kernel.h> 44#include <sys/sysctl.h> 45#include <sys/bio.h> 46#include <sys/conf.h> 47#include <sys/fcntl.h> 48#include <sys/malloc.h> 49#include <sys/sysctl.h> 50#include <sys/devicestat.h> 51#include <machine/md_var.h> 52 53#include <sys/lock.h> 54#include <sys/mutex.h> 55#include <geom/geom.h> 56#include <geom/geom_disk.h> 57#include <geom/geom_int.h> 58 59static struct mtx g_disk_done_mtx; 60 61static g_access_t g_disk_access; 62static g_init_t g_disk_init; 63static g_fini_t g_disk_fini; 64 65struct g_class g_disk_class = { 66 .name = "DISK", 67 .init = g_disk_init, 68 .fini = g_disk_fini, 69}; 70 71static void 72g_disk_init(struct g_class *mp __unused) 73{ 74 75 mtx_init(&g_disk_done_mtx, "g_disk_done", MTX_DEF, 0); 76} 77 78static void 79g_disk_fini(struct g_class *mp __unused) 80{ 81 82 mtx_destroy(&g_disk_done_mtx); 83} 84 85DECLARE_GEOM_CLASS(g_disk_class, g_disk); 86 87static void __inline 88g_disk_lock_giant(struct disk *dp) 89{ 90 if (dp->d_flags & DISKFLAG_NOGIANT) 91 return; 92 mtx_lock(&Giant); 93} 94 95static void __inline 96g_disk_unlock_giant(struct disk *dp) 97{ 98 if (dp->d_flags & DISKFLAG_NOGIANT) 99 return; 100 mtx_unlock(&Giant); 101} 102 103static int 104g_disk_access(struct g_provider *pp, int r, int w, int e) 105{ 106 struct disk *dp; 107 int error; 108 109 g_trace(G_T_ACCESS, "g_disk_access(%s, %d, %d, %d)", 110 pp->name, r, w, e); 111 g_topology_assert(); 112 r += pp->acr; 113 w += pp->acw; 114 e += pp->ace; 115 dp = pp->geom->softc; 116 if (dp == NULL) 117 return (ENXIO); 118 error = 0; 119 if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) { 120 if (dp->d_open != NULL) { 121 g_disk_lock_giant(dp); 122 error = dp->d_open(dp); 123 if (error != 0) 124 printf("Opened disk %s -> %d\n", 125 pp->name, error); 126 g_disk_unlock_giant(dp); 127 } 128 pp->mediasize = dp->d_mediasize; 129 pp->sectorsize = dp->d_sectorsize; 130 dp->d_flags |= DISKFLAG_OPEN; 131 if (dp->d_maxsize == 0) { 132 printf("WARNING: Disk drive %s%d has no d_maxsize\n", 133 dp->d_name, dp->d_unit); 134 dp->d_maxsize = DFLTPHYS; 135 } 136 } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) { 137 if (dp->d_close != NULL) { 138 g_disk_lock_giant(dp); 139 error = dp->d_close(dp); 140 if (error != 0) 141 printf("Closed disk %s -> %d\n", 142 pp->name, error); 143 g_disk_unlock_giant(dp); 144 } 145 dp->d_flags &= ~DISKFLAG_OPEN; 146 } 147 return (error); 148} 149 150static void 151g_disk_kerneldump(struct bio *bp, struct disk *dp) 152{ 153 int error; 154 struct g_kerneldump *gkd; 155 struct dumperinfo di; 156 struct g_geom *gp; 157 158 gkd = (struct g_kerneldump*)bp->bio_data; 159 gp = bp->bio_to->geom; 160 g_trace(G_T_TOPOLOGY, "g_disk_kernedump(%s, %jd, %jd)", 161 gp->name, (intmax_t)gkd->offset, (intmax_t)gkd->length);
|
166 di.dumper = dp->d_dump; 167 di.priv = dp; 168 di.blocksize = dp->d_sectorsize; 169 di.mediaoffset = gkd->offset; 170 di.mediasize = gkd->length; 171 error = set_dumper(&di); 172 g_io_deliver(bp, error); 173} 174 175static void 176g_disk_done(struct bio *bp) 177{ 178 struct bio *bp2; 179 struct disk *dp; 180 181 /* See "notes" for why we need a mutex here */ 182 /* XXX: will witness accept a mix of Giant/unGiant drivers here ? */ 183 mtx_lock(&g_disk_done_mtx); 184 bp->bio_completed = bp->bio_length - bp->bio_resid; 185 186 bp2 = bp->bio_parent; 187 dp = bp2->bio_to->geom->softc; 188 if (bp2->bio_error == 0) 189 bp2->bio_error = bp->bio_error; 190 bp2->bio_completed += bp->bio_completed; 191 g_destroy_bio(bp); 192 bp2->bio_inbed++; 193 if (bp2->bio_children == bp2->bio_inbed) { 194 bp2->bio_resid = bp2->bio_bcount - bp2->bio_completed; 195 devstat_end_transaction_bio(dp->d_devstat, bp2); 196 g_io_deliver(bp2, bp2->bio_error); 197 } 198 mtx_unlock(&g_disk_done_mtx); 199} 200 201static int 202g_disk_ioctl(struct g_provider *pp, u_long cmd, void * data, struct thread *td) 203{ 204 struct g_geom *gp; 205 struct disk *dp; 206 int error; 207 208 gp = pp->geom; 209 dp = gp->softc; 210 211 if (dp->d_ioctl == NULL) 212 return (ENOIOCTL); 213 g_disk_lock_giant(dp); 214 error = dp->d_ioctl(dp, cmd, data, 0, td); 215 g_disk_unlock_giant(dp); 216 return(error); 217} 218 219static void 220g_disk_start(struct bio *bp) 221{ 222 struct bio *bp2, *bp3; 223 struct disk *dp; 224 int error; 225 off_t off; 226 227 dp = bp->bio_to->geom->softc; 228 if (dp == NULL) 229 g_io_deliver(bp, ENXIO); 230 error = EJUSTRETURN; 231 switch(bp->bio_cmd) { 232 case BIO_DELETE: 233 if (!(dp->d_flags & DISKFLAG_CANDELETE)) { 234 error = 0; 235 break; 236 } 237 /* fall-through */ 238 case BIO_READ: 239 case BIO_WRITE: 240 off = 0; 241 bp3 = NULL; 242 bp2 = g_clone_bio(bp); 243 if (bp2 == NULL) { 244 error = ENOMEM; 245 break; 246 } 247 devstat_start_transaction_bio(dp->d_devstat, bp); 248 do { 249 bp2->bio_offset += off; 250 bp2->bio_length -= off; 251 bp2->bio_data += off; 252 if (bp2->bio_length > dp->d_maxsize) { 253 /* 254 * XXX: If we have a stripesize we should really 255 * use it here. 256 */ 257 bp2->bio_length = dp->d_maxsize; 258 off += dp->d_maxsize; 259 /* 260 * To avoid a race, we need to grab the next bio 261 * before we schedule this one. See "notes". 262 */ 263 bp3 = g_clone_bio(bp); 264 if (bp3 == NULL) 265 bp->bio_error = ENOMEM; 266 } 267 bp2->bio_done = g_disk_done; 268 bp2->bio_blkno = bp2->bio_offset >> DEV_BSHIFT; 269 bp2->bio_pblkno = bp2->bio_offset / dp->d_sectorsize; 270 bp2->bio_bcount = bp2->bio_length; 271 bp2->bio_disk = dp; 272 g_disk_lock_giant(dp); 273 dp->d_strategy(bp2); 274 g_disk_unlock_giant(dp); 275 bp2 = bp3; 276 bp3 = NULL; 277 } while (bp2 != NULL); 278 break; 279 case BIO_GETATTR: 280 if (g_handleattr_int(bp, "GEOM::fwsectors", dp->d_fwsectors)) 281 break; 282 else if (g_handleattr_int(bp, "GEOM::fwheads", dp->d_fwheads)) 283 break; 284 else if (g_handleattr_off_t(bp, "GEOM::frontstuff", 0)) 285 break; 286 else if (!strcmp(bp->bio_attribute, "GEOM::kerneldump")) 287 g_disk_kerneldump(bp, dp); 288 else 289 error = ENOIOCTL; 290 break; 291 default: 292 error = EOPNOTSUPP; 293 break; 294 } 295 if (error != EJUSTRETURN) 296 g_io_deliver(bp, error); 297 return; 298} 299 300static void 301g_disk_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp) 302{ 303 struct disk *dp; 304 305 dp = gp->softc; 306 if (dp == NULL) 307 return; 308 if (indent == NULL) { 309 sbuf_printf(sb, " hd %u", dp->d_fwheads); 310 sbuf_printf(sb, " sc %u", dp->d_fwsectors); 311 return; 312 } 313 if (pp != NULL) { 314 sbuf_printf(sb, "%s<fwheads>%u</fwheads>\n", 315 indent, dp->d_fwheads); 316 sbuf_printf(sb, "%s<fwsectors>%u</fwsectors>\n", 317 indent, dp->d_fwsectors); 318 } 319} 320 321static void 322g_disk_create(void *arg, int flag) 323{ 324 struct g_geom *gp; 325 struct g_provider *pp; 326 struct disk *dp; 327 328 if (flag == EV_CANCEL) 329 return; 330 g_topology_assert(); 331 dp = arg; 332 gp = g_new_geomf(&g_disk_class, "%s%d", dp->d_name, dp->d_unit); 333 gp->start = g_disk_start; 334 gp->access = g_disk_access; 335 gp->ioctl = g_disk_ioctl; 336 gp->softc = dp; 337 gp->dumpconf = g_disk_dumpconf; 338 pp = g_new_providerf(gp, "%s", gp->name); 339 pp->mediasize = dp->d_mediasize; 340 pp->sectorsize = dp->d_sectorsize; 341 if (dp->d_flags & DISKFLAG_CANDELETE) 342 pp->flags |= G_PF_CANDELETE; 343 pp->stripeoffset = dp->d_stripeoffset; 344 pp->stripesize = dp->d_stripesize; 345 if (bootverbose) 346 printf("GEOM: new disk %s\n", gp->name); 347 dp->d_geom = gp; 348 g_error_provider(pp, 0); 349} 350 351static void 352g_disk_destroy(void *ptr, int flag) 353{ 354 struct g_geom *gp; 355 356 g_topology_assert(); 357 gp = ptr; 358 gp->softc = NULL; 359 g_wither_geom(gp, ENXIO); 360} 361 362void 363disk_create(int unit, struct disk *dp, int flags, void *unused __unused, void * unused2 __unused) 364{ 365 366 dp->d_unit = unit; 367 dp->d_flags = flags; 368 KASSERT(dp->d_strategy != NULL, ("disk_create need d_strategy")); 369 KASSERT(dp->d_name != NULL, ("disk_create need d_name")); 370 KASSERT(*dp->d_name != 0, ("disk_create need d_name")); 371 KASSERT(strlen(dp->d_name) < SPECNAMELEN - 4, ("disk name too long")); 372 if (bootverbose || 1) 373 printf("GEOM: create disk %s%d dp=%p\n", 374 dp->d_name, dp->d_unit, dp); 375 if (dp->d_devstat == NULL) 376 dp->d_devstat = devstat_new_entry(dp->d_name, dp->d_unit, 377 dp->d_sectorsize, DEVSTAT_ALL_SUPPORTED, 378 DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX); 379 dp->d_geom = NULL; 380 g_post_event(g_disk_create, dp, M_WAITOK, dp, NULL); 381} 382 383void 384disk_destroy(struct disk *dp) 385{ 386 struct g_geom *gp; 387 388 if (bootverbose || 1) 389 printf("GEOM: destroy disk %s%d dp=%p\n", 390 dp->d_name, dp->d_unit, dp); 391 g_cancel_event(dp); 392 gp = dp->d_geom; 393 if (gp == NULL) 394 return; 395 gp->softc = NULL; 396 devstat_remove_entry(dp->d_devstat); 397 g_waitfor_event(g_disk_destroy, gp, M_WAITOK, NULL, NULL); 398 dp->d_geom = NULL; 399} 400 401static void 402g_kern_disks(void *p, int flag __unused) 403{ 404 struct sbuf *sb; 405 struct g_geom *gp; 406 char *sp; 407 408 sb = p; 409 sp = ""; 410 g_topology_assert(); 411 LIST_FOREACH(gp, &g_disk_class.geom, geom) { 412 sbuf_printf(sb, "%s%s", sp, gp->name); 413 sp = " "; 414 } 415 sbuf_finish(sb); 416} 417 418static int 419sysctl_disks(SYSCTL_HANDLER_ARGS) 420{ 421 int error; 422 struct sbuf *sb; 423 424 sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND); 425 sbuf_clear(sb); 426 g_waitfor_event(g_kern_disks, sb, M_WAITOK, NULL); 427 error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1); 428 sbuf_delete(sb); 429 return error; 430} 431 432SYSCTL_PROC(_kern, OID_AUTO, disks, CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_NOLOCK, 0, 0, 433 sysctl_disks, "A", "names of available disks"); 434
|