dksubr.c revision 1.9
1 /* $NetBSD: dksubr.c,v 1.9 2003/06/29 22:29:58 fvdl Exp $ */ 2 3 /*- 4 * Copyright (c) 1996, 1997, 1998, 1999, 2002 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jason R. Thorpe and Roland C. Dowdeswell. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/stat.h> 42 #include <sys/proc.h> 43 #include <sys/ioctl.h> 44 #include <sys/device.h> 45 #include <sys/disk.h> 46 #include <sys/disklabel.h> 47 #include <sys/vnode.h> 48 #include <sys/fcntl.h> 49 #include <sys/namei.h> 50 51 #include <dev/dkvar.h> 52 53 int dkdebug = 0; 54 55 #ifdef DEBUG 56 #define DKDB_FOLLOW 0x1 57 #define DKDB_INIT 0x2 58 #define DKDB_VNODE 0x4 59 60 #define IFDEBUG(x,y) if (dkdebug & (x)) y 61 #define DPRINTF(x,y) IFDEBUG(x, printf y) 62 #define DPRINTF_FOLLOW(y) DPRINTF(DKDB_FOLLOW, y) 63 #else 64 #define IFDEBUG(x,y) 65 #define DPRINTF(x,y) 66 #define DPRINTF_FOLLOW(y) 67 #endif 68 69 #define DKLABELDEV(dev) \ 70 (MAKEDISKDEV(major((dev)), DISKUNIT((dev)), RAW_PART)) 71 72 void dk_makedisklabel(struct dk_intf *, struct dk_softc *); 73 74 void 75 dk_sc_init(struct dk_softc *dksc, void *osc, char *xname) 76 { 77 78 memset(dksc, 0x0, sizeof(*dksc)); 79 dksc->sc_osc = osc; 80 strncpy(dksc->sc_xname, xname, DK_XNAME_SIZE); 81 dksc->sc_dkdev.dk_name = dksc->sc_xname; 82 lockinit(&dksc->sc_lock, PRIBIO, "dklk", 0, 0); 83 } 84 85 /* ARGSUSED */ 86 int 87 dk_open(struct dk_intf *di, struct dk_softc *dksc, dev_t dev, 88 int flags, int fmt, struct proc *p) 89 { 90 struct disklabel *lp = dksc->sc_dkdev.dk_label; 91 int part = DISKPART(dev); 92 int pmask = 1 << part; 93 int ret = 0; 94 95 DPRINTF_FOLLOW(("dk_open(%s, %p, 0x%x, 0x%x)\n", 96 di->di_dkname, dksc, dev, flags)); 97 98 if ((ret = lockmgr(&dksc->sc_lock, LK_EXCLUSIVE, NULL)) != 0) 99 return ret; 100 101 part = DISKPART(dev); 102 pmask = 1 << part; 103 104 /* 105 * If we're init'ed and there are no other open partitions then 106 * update the in-core disklabel. 107 */ 108 if ((dksc->sc_flags & DKF_INITED) && dksc->sc_dkdev.dk_openmask == 0) 109 dk_getdisklabel(di, dksc, dev); 110 111 /* Fail if we can't find the partition. */ 112 if ((part != RAW_PART) && 113 (((dksc->sc_flags & DKF_INITED) == 0) || 114 ((part >= lp->d_npartitions) || 115 (lp->d_partitions[part].p_fstype == FS_UNUSED)))) { 116 ret = ENXIO; 117 goto done; 118 } 119 120 /* Mark our unit as open. */ 121 switch (fmt) { 122 case S_IFCHR: 123 dksc->sc_dkdev.dk_copenmask |= pmask; 124 break; 125 case S_IFBLK: 126 dksc->sc_dkdev.dk_bopenmask |= pmask; 127 break; 128 } 129 130 dksc->sc_dkdev.dk_openmask = 131 dksc->sc_dkdev.dk_copenmask | dksc->sc_dkdev.dk_bopenmask; 132 133 done: 134 lockmgr(&dksc->sc_lock, LK_RELEASE, NULL); 135 return ret; 136 } 137 138 /* ARGSUSED */ 139 int 140 dk_close(struct dk_intf *di, struct dk_softc *dksc, dev_t dev, 141 int flags, int fmt, struct proc *p) 142 { 143 int part = DISKPART(dev); 144 int pmask = 1 << part; 145 int ret; 146 147 DPRINTF_FOLLOW(("dk_close(%s, %p, 0x%x, 0x%x)\n", 148 di->di_dkname, dksc, dev, flags)); 149 150 if ((ret = lockmgr(&dksc->sc_lock, LK_EXCLUSIVE, NULL)) != 0) 151 return ret; 152 153 switch (fmt) { 154 case S_IFCHR: 155 dksc->sc_dkdev.dk_copenmask &= ~pmask; 156 break; 157 case S_IFBLK: 158 dksc->sc_dkdev.dk_bopenmask &= ~pmask; 159 break; 160 } 161 dksc->sc_dkdev.dk_openmask = 162 dksc->sc_dkdev.dk_copenmask | dksc->sc_dkdev.dk_bopenmask; 163 164 lockmgr(&dksc->sc_lock, LK_RELEASE, NULL); 165 return 0; 166 } 167 168 void 169 dk_strategy(struct dk_intf *di, struct dk_softc *dksc, struct buf *bp) 170 { 171 int s; 172 int wlabel; 173 174 DPRINTF_FOLLOW(("dk_strategy(%s, %p, %p)\n", 175 di->di_dkname, dksc, bp)); 176 177 if (!(dksc->sc_flags & DKF_INITED)) { 178 DPRINTF_FOLLOW(("dk_stragy: not inited\n")); 179 bp->b_error = ENXIO; 180 bp->b_flags |= B_ERROR; 181 biodone(bp); 182 return; 183 } 184 185 /* XXX look for some more errors, c.f. ld.c */ 186 187 bp->b_resid = bp->b_bcount; 188 189 /* If there is nothing to do, then we are done */ 190 if (bp->b_bcount == 0) { 191 biodone(bp); 192 return; 193 } 194 195 wlabel = dksc->sc_flags & (DKF_WLABEL|DKF_LABELLING); 196 if (DISKPART(bp->b_dev) != RAW_PART && 197 bounds_check_with_label(&dksc->sc_dkdev, bp, wlabel) <= 0) { 198 biodone(bp); 199 return; 200 } 201 202 /* 203 * Start the unit by calling the start routine 204 * provided by the individual driver. 205 */ 206 s = splbio(); 207 di->di_diskstart(dksc, bp); 208 splx(s); 209 return; 210 } 211 212 int 213 dk_size(struct dk_intf *di, struct dk_softc *dksc, dev_t dev) 214 { 215 struct disklabel *lp; 216 int is_open; 217 int part; 218 int size; 219 220 if ((dksc->sc_flags & DKF_INITED) == 0) 221 return -1; 222 223 part = DISKPART(dev); 224 is_open = dksc->sc_dkdev.dk_openmask & (1 << part); 225 226 if (!is_open && di->di_open(dev, 0, S_IFBLK, curproc)) 227 return -1; 228 229 lp = dksc->sc_dkdev.dk_label; 230 if (lp->d_partitions[part].p_fstype != FS_SWAP) 231 size = -1; 232 else 233 size = lp->d_partitions[part].p_size * 234 (lp->d_secsize / DEV_BSIZE); 235 236 if (!is_open && di->di_close(dev, 0, S_IFBLK, curproc)) 237 return 1; 238 239 return size; 240 } 241 242 int 243 dk_ioctl(struct dk_intf *di, struct dk_softc *dksc, dev_t dev, 244 u_long cmd, caddr_t data, int flag, struct proc *p) 245 { 246 struct disklabel *lp; 247 #ifdef __HAVE_OLD_DISKLABEL 248 struct disklabel newlabel; 249 #endif 250 int error = 0; 251 252 DPRINTF_FOLLOW(("dk_ioctl(%s, %p, 0x%x, 0x%lx)\n", 253 di->di_dkname, dksc, dev, cmd)); 254 255 /* ensure that the pseudo disk is open for writes for these commands */ 256 switch (cmd) { 257 case DIOCSDINFO: 258 case DIOCWDINFO: 259 #ifdef __HAVE_OLD_DISKLABEL 260 case ODIOCSDINFO: 261 case ODIOCWDINFO: 262 #endif 263 case DIOCWLABEL: 264 if ((flag & FWRITE) == 0) 265 return EBADF; 266 } 267 268 /* ensure that the pseudo-disk is initialized for these */ 269 switch (cmd) { 270 case DIOCGDINFO: 271 case DIOCSDINFO: 272 case DIOCWDINFO: 273 case DIOCGPART: 274 case DIOCWLABEL: 275 case DIOCGDEFLABEL: 276 #ifdef __HAVE_OLD_DISKLABEL 277 case ODIOCGDINFO: 278 case ODIOCSDINFO: 279 case ODIOCWDINFO: 280 case ODIOCGDEFLABEL: 281 #endif 282 if ((dksc->sc_flags & DKF_INITED) == 0) 283 return ENXIO; 284 } 285 286 switch (cmd) { 287 case DIOCGDINFO: 288 *(struct disklabel *)data = *(dksc->sc_dkdev.dk_label); 289 break; 290 291 #ifdef __HAVE_OLD_DISKLABEL 292 case ODIOCGDINFO: 293 newlabel = *(dksc->sc_dkdev.dk_label); 294 if (newlabel.d_npartitions > OLDMAXPARTITIONS) 295 return ENOTTY; 296 memcpy(data, &newlabel, sizeof (struct olddisklabel)); 297 break; 298 #endif 299 300 case DIOCGPART: 301 ((struct partinfo *)data)->disklab = dksc->sc_dkdev.dk_label; 302 ((struct partinfo *)data)->part = 303 &dksc->sc_dkdev.dk_label->d_partitions[DISKPART(dev)]; 304 break; 305 306 case DIOCWDINFO: 307 case DIOCSDINFO: 308 #ifdef __HAVE_OLD_DISKLABEL 309 case ODIOCWDINFO: 310 case ODIOCSDINFO: 311 #endif 312 #ifdef __HAVE_OLD_DISKLABEL 313 if (cmd == ODIOCSDINFO || cmd == ODIOCWDINFO) { 314 memset(&newlabel, 0, sizeof newlabel); 315 memcpy(&newlabel, data, sizeof (struct olddisklabel)); 316 lp = &newlabel; 317 } else 318 #endif 319 lp = (struct disklabel *)data; 320 321 dksc->sc_flags |= DKF_LABELLING; 322 323 error = setdisklabel(dksc->sc_dkdev.dk_label, 324 lp, 0, dksc->sc_dkdev.dk_cpulabel); 325 if (error == 0) { 326 if (cmd == DIOCWDINFO 327 #ifdef __HAVE_OLD_DISKLABEL 328 || cmd == ODIOCWDINFO 329 #endif 330 ) 331 error = writedisklabel(DKLABELDEV(dev), 332 di->di_strategy, dksc->sc_dkdev.dk_label, 333 dksc->sc_dkdev.dk_cpulabel); 334 } 335 336 dksc->sc_flags &= ~DKF_LABELLING; 337 break; 338 339 case DIOCWLABEL: 340 if (*(int *)data != 0) 341 dksc->sc_flags |= DKF_WLABEL; 342 else 343 dksc->sc_flags &= ~DKF_WLABEL; 344 break; 345 346 case DIOCGDEFLABEL: 347 dk_getdefaultlabel(di, dksc, (struct disklabel *)data); 348 break; 349 350 #ifdef __HAVE_OLD_DISKLABEL 351 case ODIOCGDEFLABEL: 352 dk_getdefaultlabel(di, dksc, &newlabel); 353 if (newlabel.d_npartitions > OLDMAXPARTITIONS) 354 return ENOTTY; 355 memcpy(data, &newlabel, sizeof (struct olddisklabel)); 356 break; 357 #endif 358 359 default: 360 error = ENOTTY; 361 } 362 363 return error; 364 } 365 366 /* 367 * dk_dump dumps all of physical memory into the partition specified. 368 * This requires substantially more framework than {s,w}ddump, and hence 369 * is probably much more fragile. 370 * 371 * XXX: we currently do not implement this. 372 */ 373 374 #define DKF_READYFORDUMP (DKF_INITED|DKF_TAKEDUMP) 375 #define DKFF_READYFORDUMP(x) (((x) & DKF_READYFORDUMP) == DKF_READYFORDUMP) 376 static volatile int dk_dumping = 0; 377 378 /* ARGSUSED */ 379 int 380 dk_dump(struct dk_intf *di, struct dk_softc *dksc, dev_t dev, 381 daddr_t blkno, caddr_t va, size_t size) 382 { 383 384 /* 385 * ensure that we consider this device to be safe for dumping, 386 * and that the device is configured. 387 */ 388 if (!DKFF_READYFORDUMP(dksc->sc_flags)) 389 return ENXIO; 390 391 /* ensure that we are not already dumping */ 392 if (dk_dumping) 393 return EFAULT; 394 dk_dumping = 1; 395 396 /* XXX: unimplemented */ 397 398 dk_dumping = 0; 399 400 /* XXX: actually for now, we are going to leave this alone */ 401 return ENXIO; 402 } 403 404 /* ARGSUSED */ 405 void 406 dk_getdefaultlabel(struct dk_intf *di, struct dk_softc *dksc, 407 struct disklabel *lp) 408 { 409 struct dk_geom *pdg = &dksc->sc_geom; 410 411 memset(lp, 0, sizeof(*lp)); 412 413 lp->d_secperunit = dksc->sc_size; 414 lp->d_secsize = pdg->pdg_secsize; 415 lp->d_nsectors = pdg->pdg_nsectors; 416 lp->d_ntracks = pdg->pdg_ntracks; 417 lp->d_ncylinders = pdg->pdg_ncylinders; 418 lp->d_secpercyl = lp->d_ntracks * lp->d_nsectors; 419 420 strncpy(lp->d_typename, di->di_dkname, sizeof(lp->d_typename)); 421 lp->d_type = di->di_dtype; 422 strncpy(lp->d_packname, "fictitious", sizeof(lp->d_packname)); 423 lp->d_rpm = 3600; 424 lp->d_interleave = 1; 425 lp->d_flags = 0; 426 427 lp->d_partitions[RAW_PART].p_offset = 0; 428 lp->d_partitions[RAW_PART].p_size = dksc->sc_size; 429 lp->d_partitions[RAW_PART].p_fstype = FS_UNUSED; 430 lp->d_npartitions = RAW_PART + 1; 431 432 lp->d_magic = DISKMAGIC; 433 lp->d_magic2 = DISKMAGIC; 434 lp->d_checksum = dkcksum(dksc->sc_dkdev.dk_label); 435 } 436 437 /* ARGSUSED */ 438 void 439 dk_getdisklabel(struct dk_intf *di, struct dk_softc *dksc, dev_t dev) 440 { 441 struct disklabel *lp = dksc->sc_dkdev.dk_label; 442 struct cpu_disklabel *clp = dksc->sc_dkdev.dk_cpulabel; 443 struct partition *pp; 444 int i; 445 const char *errstring; 446 447 memset(clp, 0x0, sizeof(*clp)); 448 dk_getdefaultlabel(di, dksc, lp); 449 errstring = readdisklabel(DKLABELDEV(dev), di->di_strategy, 450 dksc->sc_dkdev.dk_label, dksc->sc_dkdev.dk_cpulabel); 451 if (errstring) { 452 dk_makedisklabel(di, dksc); 453 if (dksc->sc_flags & DKF_WARNLABEL) 454 printf("%s: %s\n", dksc->sc_xname, errstring); 455 return; 456 } 457 458 if ((dksc->sc_flags & DKF_LABELSANITY) == 0) 459 return; 460 461 /* Sanity check */ 462 if (lp->d_secperunit != dksc->sc_size) 463 printf("WARNING: %s: total sector size in disklabel (%d) " 464 "!= the size of %s (%lu)\n", dksc->sc_xname, 465 lp->d_secperunit, di->di_dkname, (u_long)dksc->sc_size); 466 467 for (i=0; i < lp->d_npartitions; i++) { 468 pp = &lp->d_partitions[i]; 469 if (pp->p_offset + pp->p_size > dksc->sc_size) 470 printf("WARNING: %s: end of partition `%c' exceeds " 471 "the size of %s (%lu)\n", dksc->sc_xname, 472 'a' + i, di->di_dkname, (u_long)dksc->sc_size); 473 } 474 } 475 476 /* ARGSUSED */ 477 void 478 dk_makedisklabel(struct dk_intf *di, struct dk_softc *dksc) 479 { 480 struct disklabel *lp = dksc->sc_dkdev.dk_label; 481 482 lp->d_partitions[RAW_PART].p_fstype = FS_BSDFFS; 483 strncpy(lp->d_packname, "default label", sizeof(lp->d_packname)); 484 lp->d_checksum = dkcksum(lp); 485 } 486 487 /* This function is taken from ccd.c:1.76 --rcd */ 488 489 /* 490 * XXX this function looks too generic for dksubr.c, shouldn't we 491 * put it somewhere better? 492 */ 493 494 /* 495 * Lookup the provided name in the filesystem. If the file exists, 496 * is a valid block device, and isn't being used by anyone else, 497 * set *vpp to the file's vnode. 498 */ 499 int 500 dk_lookup(path, p, vpp) 501 char *path; 502 struct proc *p; 503 struct vnode **vpp; /* result */ 504 { 505 struct nameidata nd; 506 struct vnode *vp; 507 struct vattr va; 508 int error; 509 510 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, path, p); 511 if ((error = vn_open(&nd, FREAD|FWRITE, 0)) != 0) { 512 DPRINTF((DKDB_FOLLOW|DKDB_INIT), 513 ("dk_lookup: vn_open error = %d\n", error)); 514 return (error); 515 } 516 vp = nd.ni_vp; 517 518 if (vp->v_usecount > 1) { 519 VOP_UNLOCK(vp, 0); 520 (void)vn_close(vp, FREAD|FWRITE, p->p_ucred, p); 521 return (EBUSY); 522 } 523 524 if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p)) != 0) { 525 DPRINTF((DKDB_FOLLOW|DKDB_INIT), 526 ("dk_lookup: getattr error = %d\n", error)); 527 VOP_UNLOCK(vp, 0); 528 (void)vn_close(vp, FREAD|FWRITE, p->p_ucred, p); 529 return (error); 530 } 531 532 /* XXX: eventually we should handle VREG, too. */ 533 if (va.va_type != VBLK) { 534 VOP_UNLOCK(vp, 0); 535 (void)vn_close(vp, FREAD|FWRITE, p->p_ucred, p); 536 return (ENOTBLK); 537 } 538 539 IFDEBUG(DKDB_VNODE, vprint("dk_lookup: vnode info", vp)); 540 541 VOP_UNLOCK(vp, 0); 542 *vpp = vp; 543 return (0); 544 } 545
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