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 * $FreeBSD$ 36 */ 37 38 #include "opt_geom.h" 39 40 #include <sys/param.h> 41 #include <sys/systm.h> 42 #include <sys/kernel.h> 43 #include <sys/sysctl.h> 44 #include <sys/bio.h> 45 #include <sys/conf.h> 46 #include <sys/disk.h> 47 #include <sys/fcntl.h> 48 #include <sys/malloc.h> 49 #include <sys/sysctl.h> 50 #include <sys/stdint.h> 51 #include <machine/md_var.h> 52 53 #include <sys/lock.h> 54 #include <sys/mutex.h> 55 #include <geom/geom.h> 56 57 static struct mtx g_disk_done_mtx; 58 59 static g_access_t g_disk_access; 60 61 struct g_class g_disk_class = { 62 "DISK", 63 NULL, 64 NULL, 65 G_CLASS_INITIALIZER 66 }; 67 68 static void 69 g_disk_init(void) 70 { 71 mtx_unlock(&Giant); 72 g_add_class(&g_disk_class); 73 mtx_init(&g_disk_done_mtx, "g_disk_done", MTX_DEF, 0); 74 mtx_lock(&Giant); 75 } 76 77 DECLARE_GEOM_CLASS_INIT(g_disk_class, g_disk, g_disk_init); 78 79 static void __inline 80 g_disk_lock_giant(struct disk *dp) 81 { 82 if (dp->d_flags & DISKFLAG_NOGIANT) 83 return; 84 mtx_lock(&Giant); 85 } 86 87 static void __inline 88 g_disk_unlock_giant(struct disk *dp) 89 { 90 if (dp->d_flags & DISKFLAG_NOGIANT) 91 return; 92 mtx_unlock(&Giant); 93 } 94 95 static int 96 g_disk_access(struct g_provider *pp, int r, int w, int e) 97 { 98 struct disk *dp; 99 int error; 100 101 g_trace(G_T_ACCESS, "g_disk_access(%s, %d, %d, %d)", 102 pp->name, r, w, e); 103 g_topology_assert(); 104 r += pp->acr; 105 w += pp->acw; 106 e += pp->ace; 107 dp = pp->geom->softc; 108 error = 0; 109 if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) { 110 if (dp->d_open != NULL) { 111 g_disk_lock_giant(dp); 112 error = dp->d_open(dp); 113 if (error != 0) 114 printf("Opened disk %s -> %d\n", 115 pp->name, error); 116 g_disk_unlock_giant(dp); 117 } 118 pp->mediasize = dp->d_mediasize; 119 pp->sectorsize = dp->d_sectorsize; 120 dp->d_flags |= DISKFLAG_OPEN; 121 if (dp->d_maxsize == 0) { 122 printf("WARNING: Disk drive %s%d has no d_maxsize\n", 123 dp->d_name, dp->d_unit); 124 dp->d_maxsize = DFLTPHYS; 125 } 126 } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) { 127 if (dp->d_close != NULL) { 128 g_disk_lock_giant(dp); 129 error = dp->d_close(dp); 130 if (error != 0) 131 printf("Closed disk %s -> %d\n", 132 pp->name, error); 133 g_disk_unlock_giant(dp); 134 } 135 dp->d_flags &= ~DISKFLAG_OPEN; 136 } 137 return (error); 138 } 139 140 static void 141 g_disk_kerneldump(struct bio *bp, struct disk *dp) 142 { 143 int error; 144 struct g_kerneldump *gkd; 145 struct dumperinfo di; 146 struct g_geom *gp; 147 148 gkd = (struct g_kerneldump*)bp->bio_data; 149 gp = bp->bio_to->geom; 150 g_trace(G_T_TOPOLOGY, "g_disk_kernedump(%s, %jd, %jd)", 151 gp->name, (intmax_t)gkd->offset, (intmax_t)gkd->length); 152 di.dumper = dp->d_dump; 153 di.priv = dp; 154 di.blocksize = dp->d_sectorsize; 155 di.mediaoffset = gkd->offset; 156 di.mediasize = gkd->length; 157 error = set_dumper(&di); 158 g_io_deliver(bp, error); 159 } 160 161 static void 162 g_disk_done(struct bio *bp) 163 { 164 165 /* See "notes" for why we need a mutex here */ 166 /* XXX: will witness accept a mix of Giant/unGiant drivers here ? */ 167 mtx_lock(&g_disk_done_mtx); 168 bp->bio_completed = bp->bio_length - bp->bio_resid; 169 g_std_done(bp); 170 mtx_unlock(&g_disk_done_mtx); 171 } 172 173 static void 174 g_disk_start(struct bio *bp) 175 { 176 struct bio *bp2, *bp3; 177 struct disk *dp; 178 struct g_ioctl *gio; 179 int error; 180 off_t off; 181 182 dp = bp->bio_to->geom->softc; 183 error = EJUSTRETURN; 184 switch(bp->bio_cmd) { 185 case BIO_DELETE: 186 if (!(dp->d_flags & DISKFLAG_CANDELETE)) { 187 error = 0; 188 break; 189 } 190 /* fall-through */ 191 case BIO_READ: 192 case BIO_WRITE: 193 off = 0; 194 bp3 = NULL; 195 bp2 = g_clone_bio(bp); 196 if (bp2 == NULL) { 197 error = ENOMEM; 198 break; 199 } 200 do { 201 bp2->bio_offset += off; 202 bp2->bio_length -= off; 203 bp2->bio_data += off; 204 if (bp2->bio_length > dp->d_maxsize) { 205 /* 206 * XXX: If we have a stripesize we should really 207 * use it here. 208 */ 209 bp2->bio_length = dp->d_maxsize; 210 off += dp->d_maxsize; 211 /* 212 * To avoid a race, we need to grab the next bio 213 * before we schedule this one. See "notes". 214 */ 215 bp3 = g_clone_bio(bp); 216 if (bp3 == NULL) 217 bp->bio_error = ENOMEM; 218 } 219 bp2->bio_done = g_disk_done; 220 bp2->bio_blkno = bp2->bio_offset >> DEV_BSHIFT; 221 bp2->bio_pblkno = bp2->bio_offset / dp->d_sectorsize; 222 bp2->bio_bcount = bp2->bio_length; 223 bp2->bio_disk = dp; 224 g_disk_lock_giant(dp); 225 dp->d_strategy(bp2); 226 g_disk_unlock_giant(dp); 227 bp2 = bp3; 228 bp3 = NULL; 229 } while (bp2 != NULL); 230 break; 231 case BIO_GETATTR: 232 if (g_handleattr_int(bp, "GEOM::fwsectors", dp->d_fwsectors)) 233 break; 234 else if (g_handleattr_int(bp, "GEOM::fwheads", dp->d_fwheads)) 235 break; 236 else if (g_handleattr_off_t(bp, "GEOM::frontstuff", 0)) 237 break; 238 else if (!strcmp(bp->bio_attribute, "GEOM::kerneldump")) 239 g_disk_kerneldump(bp, dp); 240 else if ((dp->d_ioctl != NULL) && 241 !strcmp(bp->bio_attribute, "GEOM::ioctl") && 242 bp->bio_length == sizeof *gio) { 243 gio = (struct g_ioctl *)bp->bio_data; 244 gio->dev = dp; 245 gio->func = (d_ioctl_t *)(dp->d_ioctl); 246 error = EDIRIOCTL; 247 } else 248 error = ENOIOCTL; 249 break; 250 case BIO_SETATTR: 251 error = ENOIOCTL; 252 break; 253 default: 254 error = EOPNOTSUPP; 255 break; 256 } 257 if (error != EJUSTRETURN) 258 g_io_deliver(bp, error); 259 return; 260 } 261 262 static void 263 g_disk_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp) 264 { 265 struct disk *dp; 266 267 dp = gp->softc; 268 if (indent == NULL) { 269 sbuf_printf(sb, " hd %u", dp->d_fwheads); 270 sbuf_printf(sb, " sc %u", dp->d_fwsectors); 271 return; 272 } 273 if (pp != NULL) { 274 sbuf_printf(sb, "%s<fwheads>%u</fwheads>\n", 275 indent, dp->d_fwheads); 276 sbuf_printf(sb, "%s<fwsectors>%u</fwsectors>\n", 277 indent, dp->d_fwsectors); 278 } 279 } 280 281 static void 282 g_disk_create(void *arg) 283 { 284 struct g_geom *gp; 285 struct g_provider *pp; 286 struct disk *dp; 287 288 g_topology_assert(); 289 dp = arg; 290 gp = g_new_geomf(&g_disk_class, "%s%d", dp->d_name, dp->d_unit); 291 gp->start = g_disk_start; 292 gp->access = g_disk_access; 293 gp->softc = dp; 294 gp->dumpconf = g_disk_dumpconf; 295 dp->d_geom = gp; 296 pp = g_new_providerf(gp, "%s", gp->name); 297 pp->mediasize = dp->d_mediasize; 298 pp->sectorsize = dp->d_sectorsize; 299 if (dp->d_flags & DISKFLAG_CANDELETE) 300 pp->flags |= G_PF_CANDELETE; 301 pp->stripeoffset = dp->d_stripeoffset; 302 pp->stripesize = dp->d_stripesize; 303 g_error_provider(pp, 0); 304 if (bootverbose) 305 printf("GEOM: new disk %s\n", gp->name); 306 } 307 308 309 310 void 311 disk_create(int unit, struct disk *dp, int flags, void *unused __unused, void * unused2 __unused) 312 { 313 314 dp->d_unit = unit; 315 dp->d_flags = flags; 316 KASSERT(dp->d_strategy != NULL, ("disk_create need d_strategy")); 317 KASSERT(dp->d_name != NULL, ("disk_create need d_name")); 318 KASSERT(*dp->d_name != 0, ("disk_create need d_name")); 319 KASSERT(strlen(dp->d_name) < SPECNAMELEN - 4, ("disk name too long")); 320 g_call_me(g_disk_create, dp); 321 } 322 323 void 324 disk_destroy(struct disk *dp) 325 { 326 struct g_geom *gp; 327 328 gp = dp->d_geom; 329 gp->flags |= G_GEOM_WITHER; 330 gp->softc = NULL; 331 g_orphan_provider(LIST_FIRST(&gp->provider), ENXIO); 332 } 333 334 static void 335 g_kern_disks(void *p) 336 { 337 struct sbuf *sb; 338 struct g_geom *gp; 339 char *sp; 340 341 sb = p; 342 sp = ""; 343 g_topology_assert(); 344 LIST_FOREACH(gp, &g_disk_class.geom, geom) { 345 sbuf_printf(sb, "%s%s", sp, gp->name); 346 sp = " "; 347 } 348 sbuf_finish(sb); 349 wakeup(sb); 350 } 351 352 static int 353 sysctl_disks(SYSCTL_HANDLER_ARGS) 354 { 355 int error; 356 struct sbuf *sb; 357 358 sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND); 359 sbuf_clear(sb); 360 g_call_me(g_kern_disks, sb); 361 do { 362 tsleep(sb, PZERO, "kern.disks", hz); 363 } while(!sbuf_done(sb)); 364 error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1); 365 sbuf_delete(sb); 366 return error; 367 } 368 369 SYSCTL_PROC(_kern, OID_AUTO, disks, CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_NOLOCK, 0, 0, 370 sysctl_disks, "A", "names of available disks"); 371 372