dksubr.c revision 1.10
1 /* $NetBSD: dksubr.c,v 1.10 2003/07/14 15:47:03 lukem 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/cdefs.h> 40 __KERNEL_RCSID(0, "$NetBSD: dksubr.c,v 1.10 2003/07/14 15:47:03 lukem Exp $"); 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/stat.h> 45 #include <sys/proc.h> 46 #include <sys/ioctl.h> 47 #include <sys/device.h> 48 #include <sys/disk.h> 49 #include <sys/disklabel.h> 50 #include <sys/vnode.h> 51 #include <sys/fcntl.h> 52 #include <sys/namei.h> 53 54 #include <dev/dkvar.h> 55 56 int dkdebug = 0; 57 58 #ifdef DEBUG 59 #define DKDB_FOLLOW 0x1 60 #define DKDB_INIT 0x2 61 #define DKDB_VNODE 0x4 62 63 #define IFDEBUG(x,y) if (dkdebug & (x)) y 64 #define DPRINTF(x,y) IFDEBUG(x, printf y) 65 #define DPRINTF_FOLLOW(y) DPRINTF(DKDB_FOLLOW, y) 66 #else 67 #define IFDEBUG(x,y) 68 #define DPRINTF(x,y) 69 #define DPRINTF_FOLLOW(y) 70 #endif 71 72 #define DKLABELDEV(dev) \ 73 (MAKEDISKDEV(major((dev)), DISKUNIT((dev)), RAW_PART)) 74 75 void dk_makedisklabel(struct dk_intf *, struct dk_softc *); 76 77 void 78 dk_sc_init(struct dk_softc *dksc, void *osc, char *xname) 79 { 80 81 memset(dksc, 0x0, sizeof(*dksc)); 82 dksc->sc_osc = osc; 83 strncpy(dksc->sc_xname, xname, DK_XNAME_SIZE); 84 dksc->sc_dkdev.dk_name = dksc->sc_xname; 85 lockinit(&dksc->sc_lock, PRIBIO, "dklk", 0, 0); 86 } 87 88 /* ARGSUSED */ 89 int 90 dk_open(struct dk_intf *di, struct dk_softc *dksc, dev_t dev, 91 int flags, int fmt, struct proc *p) 92 { 93 struct disklabel *lp = dksc->sc_dkdev.dk_label; 94 int part = DISKPART(dev); 95 int pmask = 1 << part; 96 int ret = 0; 97 98 DPRINTF_FOLLOW(("dk_open(%s, %p, 0x%x, 0x%x)\n", 99 di->di_dkname, dksc, dev, flags)); 100 101 if ((ret = lockmgr(&dksc->sc_lock, LK_EXCLUSIVE, NULL)) != 0) 102 return ret; 103 104 part = DISKPART(dev); 105 pmask = 1 << part; 106 107 /* 108 * If we're init'ed and there are no other open partitions then 109 * update the in-core disklabel. 110 */ 111 if ((dksc->sc_flags & DKF_INITED) && dksc->sc_dkdev.dk_openmask == 0) 112 dk_getdisklabel(di, dksc, dev); 113 114 /* Fail if we can't find the partition. */ 115 if ((part != RAW_PART) && 116 (((dksc->sc_flags & DKF_INITED) == 0) || 117 ((part >= lp->d_npartitions) || 118 (lp->d_partitions[part].p_fstype == FS_UNUSED)))) { 119 ret = ENXIO; 120 goto done; 121 } 122 123 /* Mark our unit as open. */ 124 switch (fmt) { 125 case S_IFCHR: 126 dksc->sc_dkdev.dk_copenmask |= pmask; 127 break; 128 case S_IFBLK: 129 dksc->sc_dkdev.dk_bopenmask |= pmask; 130 break; 131 } 132 133 dksc->sc_dkdev.dk_openmask = 134 dksc->sc_dkdev.dk_copenmask | dksc->sc_dkdev.dk_bopenmask; 135 136 done: 137 lockmgr(&dksc->sc_lock, LK_RELEASE, NULL); 138 return ret; 139 } 140 141 /* ARGSUSED */ 142 int 143 dk_close(struct dk_intf *di, struct dk_softc *dksc, dev_t dev, 144 int flags, int fmt, struct proc *p) 145 { 146 int part = DISKPART(dev); 147 int pmask = 1 << part; 148 int ret; 149 150 DPRINTF_FOLLOW(("dk_close(%s, %p, 0x%x, 0x%x)\n", 151 di->di_dkname, dksc, dev, flags)); 152 153 if ((ret = lockmgr(&dksc->sc_lock, LK_EXCLUSIVE, NULL)) != 0) 154 return ret; 155 156 switch (fmt) { 157 case S_IFCHR: 158 dksc->sc_dkdev.dk_copenmask &= ~pmask; 159 break; 160 case S_IFBLK: 161 dksc->sc_dkdev.dk_bopenmask &= ~pmask; 162 break; 163 } 164 dksc->sc_dkdev.dk_openmask = 165 dksc->sc_dkdev.dk_copenmask | dksc->sc_dkdev.dk_bopenmask; 166 167 lockmgr(&dksc->sc_lock, LK_RELEASE, NULL); 168 return 0; 169 } 170 171 void 172 dk_strategy(struct dk_intf *di, struct dk_softc *dksc, struct buf *bp) 173 { 174 int s; 175 int wlabel; 176 177 DPRINTF_FOLLOW(("dk_strategy(%s, %p, %p)\n", 178 di->di_dkname, dksc, bp)); 179 180 if (!(dksc->sc_flags & DKF_INITED)) { 181 DPRINTF_FOLLOW(("dk_stragy: not inited\n")); 182 bp->b_error = ENXIO; 183 bp->b_flags |= B_ERROR; 184 biodone(bp); 185 return; 186 } 187 188 /* XXX look for some more errors, c.f. ld.c */ 189 190 bp->b_resid = bp->b_bcount; 191 192 /* If there is nothing to do, then we are done */ 193 if (bp->b_bcount == 0) { 194 biodone(bp); 195 return; 196 } 197 198 wlabel = dksc->sc_flags & (DKF_WLABEL|DKF_LABELLING); 199 if (DISKPART(bp->b_dev) != RAW_PART && 200 bounds_check_with_label(&dksc->sc_dkdev, bp, wlabel) <= 0) { 201 biodone(bp); 202 return; 203 } 204 205 /* 206 * Start the unit by calling the start routine 207 * provided by the individual driver. 208 */ 209 s = splbio(); 210 di->di_diskstart(dksc, bp); 211 splx(s); 212 return; 213 } 214 215 int 216 dk_size(struct dk_intf *di, struct dk_softc *dksc, dev_t dev) 217 { 218 struct disklabel *lp; 219 int is_open; 220 int part; 221 int size; 222 223 if ((dksc->sc_flags & DKF_INITED) == 0) 224 return -1; 225 226 part = DISKPART(dev); 227 is_open = dksc->sc_dkdev.dk_openmask & (1 << part); 228 229 if (!is_open && di->di_open(dev, 0, S_IFBLK, curproc)) 230 return -1; 231 232 lp = dksc->sc_dkdev.dk_label; 233 if (lp->d_partitions[part].p_fstype != FS_SWAP) 234 size = -1; 235 else 236 size = lp->d_partitions[part].p_size * 237 (lp->d_secsize / DEV_BSIZE); 238 239 if (!is_open && di->di_close(dev, 0, S_IFBLK, curproc)) 240 return 1; 241 242 return size; 243 } 244 245 int 246 dk_ioctl(struct dk_intf *di, struct dk_softc *dksc, dev_t dev, 247 u_long cmd, caddr_t data, int flag, struct proc *p) 248 { 249 struct disklabel *lp; 250 #ifdef __HAVE_OLD_DISKLABEL 251 struct disklabel newlabel; 252 #endif 253 int error = 0; 254 255 DPRINTF_FOLLOW(("dk_ioctl(%s, %p, 0x%x, 0x%lx)\n", 256 di->di_dkname, dksc, dev, cmd)); 257 258 /* ensure that the pseudo disk is open for writes for these commands */ 259 switch (cmd) { 260 case DIOCSDINFO: 261 case DIOCWDINFO: 262 #ifdef __HAVE_OLD_DISKLABEL 263 case ODIOCSDINFO: 264 case ODIOCWDINFO: 265 #endif 266 case DIOCWLABEL: 267 if ((flag & FWRITE) == 0) 268 return EBADF; 269 } 270 271 /* ensure that the pseudo-disk is initialized for these */ 272 switch (cmd) { 273 case DIOCGDINFO: 274 case DIOCSDINFO: 275 case DIOCWDINFO: 276 case DIOCGPART: 277 case DIOCWLABEL: 278 case DIOCGDEFLABEL: 279 #ifdef __HAVE_OLD_DISKLABEL 280 case ODIOCGDINFO: 281 case ODIOCSDINFO: 282 case ODIOCWDINFO: 283 case ODIOCGDEFLABEL: 284 #endif 285 if ((dksc->sc_flags & DKF_INITED) == 0) 286 return ENXIO; 287 } 288 289 switch (cmd) { 290 case DIOCGDINFO: 291 *(struct disklabel *)data = *(dksc->sc_dkdev.dk_label); 292 break; 293 294 #ifdef __HAVE_OLD_DISKLABEL 295 case ODIOCGDINFO: 296 newlabel = *(dksc->sc_dkdev.dk_label); 297 if (newlabel.d_npartitions > OLDMAXPARTITIONS) 298 return ENOTTY; 299 memcpy(data, &newlabel, sizeof (struct olddisklabel)); 300 break; 301 #endif 302 303 case DIOCGPART: 304 ((struct partinfo *)data)->disklab = dksc->sc_dkdev.dk_label; 305 ((struct partinfo *)data)->part = 306 &dksc->sc_dkdev.dk_label->d_partitions[DISKPART(dev)]; 307 break; 308 309 case DIOCWDINFO: 310 case DIOCSDINFO: 311 #ifdef __HAVE_OLD_DISKLABEL 312 case ODIOCWDINFO: 313 case ODIOCSDINFO: 314 #endif 315 #ifdef __HAVE_OLD_DISKLABEL 316 if (cmd == ODIOCSDINFO || cmd == ODIOCWDINFO) { 317 memset(&newlabel, 0, sizeof newlabel); 318 memcpy(&newlabel, data, sizeof (struct olddisklabel)); 319 lp = &newlabel; 320 } else 321 #endif 322 lp = (struct disklabel *)data; 323 324 dksc->sc_flags |= DKF_LABELLING; 325 326 error = setdisklabel(dksc->sc_dkdev.dk_label, 327 lp, 0, dksc->sc_dkdev.dk_cpulabel); 328 if (error == 0) { 329 if (cmd == DIOCWDINFO 330 #ifdef __HAVE_OLD_DISKLABEL 331 || cmd == ODIOCWDINFO 332 #endif 333 ) 334 error = writedisklabel(DKLABELDEV(dev), 335 di->di_strategy, dksc->sc_dkdev.dk_label, 336 dksc->sc_dkdev.dk_cpulabel); 337 } 338 339 dksc->sc_flags &= ~DKF_LABELLING; 340 break; 341 342 case DIOCWLABEL: 343 if (*(int *)data != 0) 344 dksc->sc_flags |= DKF_WLABEL; 345 else 346 dksc->sc_flags &= ~DKF_WLABEL; 347 break; 348 349 case DIOCGDEFLABEL: 350 dk_getdefaultlabel(di, dksc, (struct disklabel *)data); 351 break; 352 353 #ifdef __HAVE_OLD_DISKLABEL 354 case ODIOCGDEFLABEL: 355 dk_getdefaultlabel(di, dksc, &newlabel); 356 if (newlabel.d_npartitions > OLDMAXPARTITIONS) 357 return ENOTTY; 358 memcpy(data, &newlabel, sizeof (struct olddisklabel)); 359 break; 360 #endif 361 362 default: 363 error = ENOTTY; 364 } 365 366 return error; 367 } 368 369 /* 370 * dk_dump dumps all of physical memory into the partition specified. 371 * This requires substantially more framework than {s,w}ddump, and hence 372 * is probably much more fragile. 373 * 374 * XXX: we currently do not implement this. 375 */ 376 377 #define DKF_READYFORDUMP (DKF_INITED|DKF_TAKEDUMP) 378 #define DKFF_READYFORDUMP(x) (((x) & DKF_READYFORDUMP) == DKF_READYFORDUMP) 379 static volatile int dk_dumping = 0; 380 381 /* ARGSUSED */ 382 int 383 dk_dump(struct dk_intf *di, struct dk_softc *dksc, dev_t dev, 384 daddr_t blkno, caddr_t va, size_t size) 385 { 386 387 /* 388 * ensure that we consider this device to be safe for dumping, 389 * and that the device is configured. 390 */ 391 if (!DKFF_READYFORDUMP(dksc->sc_flags)) 392 return ENXIO; 393 394 /* ensure that we are not already dumping */ 395 if (dk_dumping) 396 return EFAULT; 397 dk_dumping = 1; 398 399 /* XXX: unimplemented */ 400 401 dk_dumping = 0; 402 403 /* XXX: actually for now, we are going to leave this alone */ 404 return ENXIO; 405 } 406 407 /* ARGSUSED */ 408 void 409 dk_getdefaultlabel(struct dk_intf *di, struct dk_softc *dksc, 410 struct disklabel *lp) 411 { 412 struct dk_geom *pdg = &dksc->sc_geom; 413 414 memset(lp, 0, sizeof(*lp)); 415 416 lp->d_secperunit = dksc->sc_size; 417 lp->d_secsize = pdg->pdg_secsize; 418 lp->d_nsectors = pdg->pdg_nsectors; 419 lp->d_ntracks = pdg->pdg_ntracks; 420 lp->d_ncylinders = pdg->pdg_ncylinders; 421 lp->d_secpercyl = lp->d_ntracks * lp->d_nsectors; 422 423 strncpy(lp->d_typename, di->di_dkname, sizeof(lp->d_typename)); 424 lp->d_type = di->di_dtype; 425 strncpy(lp->d_packname, "fictitious", sizeof(lp->d_packname)); 426 lp->d_rpm = 3600; 427 lp->d_interleave = 1; 428 lp->d_flags = 0; 429 430 lp->d_partitions[RAW_PART].p_offset = 0; 431 lp->d_partitions[RAW_PART].p_size = dksc->sc_size; 432 lp->d_partitions[RAW_PART].p_fstype = FS_UNUSED; 433 lp->d_npartitions = RAW_PART + 1; 434 435 lp->d_magic = DISKMAGIC; 436 lp->d_magic2 = DISKMAGIC; 437 lp->d_checksum = dkcksum(dksc->sc_dkdev.dk_label); 438 } 439 440 /* ARGSUSED */ 441 void 442 dk_getdisklabel(struct dk_intf *di, struct dk_softc *dksc, dev_t dev) 443 { 444 struct disklabel *lp = dksc->sc_dkdev.dk_label; 445 struct cpu_disklabel *clp = dksc->sc_dkdev.dk_cpulabel; 446 struct partition *pp; 447 int i; 448 const char *errstring; 449 450 memset(clp, 0x0, sizeof(*clp)); 451 dk_getdefaultlabel(di, dksc, lp); 452 errstring = readdisklabel(DKLABELDEV(dev), di->di_strategy, 453 dksc->sc_dkdev.dk_label, dksc->sc_dkdev.dk_cpulabel); 454 if (errstring) { 455 dk_makedisklabel(di, dksc); 456 if (dksc->sc_flags & DKF_WARNLABEL) 457 printf("%s: %s\n", dksc->sc_xname, errstring); 458 return; 459 } 460 461 if ((dksc->sc_flags & DKF_LABELSANITY) == 0) 462 return; 463 464 /* Sanity check */ 465 if (lp->d_secperunit != dksc->sc_size) 466 printf("WARNING: %s: total sector size in disklabel (%d) " 467 "!= the size of %s (%lu)\n", dksc->sc_xname, 468 lp->d_secperunit, di->di_dkname, (u_long)dksc->sc_size); 469 470 for (i=0; i < lp->d_npartitions; i++) { 471 pp = &lp->d_partitions[i]; 472 if (pp->p_offset + pp->p_size > dksc->sc_size) 473 printf("WARNING: %s: end of partition `%c' exceeds " 474 "the size of %s (%lu)\n", dksc->sc_xname, 475 'a' + i, di->di_dkname, (u_long)dksc->sc_size); 476 } 477 } 478 479 /* ARGSUSED */ 480 void 481 dk_makedisklabel(struct dk_intf *di, struct dk_softc *dksc) 482 { 483 struct disklabel *lp = dksc->sc_dkdev.dk_label; 484 485 lp->d_partitions[RAW_PART].p_fstype = FS_BSDFFS; 486 strncpy(lp->d_packname, "default label", sizeof(lp->d_packname)); 487 lp->d_checksum = dkcksum(lp); 488 } 489 490 /* This function is taken from ccd.c:1.76 --rcd */ 491 492 /* 493 * XXX this function looks too generic for dksubr.c, shouldn't we 494 * put it somewhere better? 495 */ 496 497 /* 498 * Lookup the provided name in the filesystem. If the file exists, 499 * is a valid block device, and isn't being used by anyone else, 500 * set *vpp to the file's vnode. 501 */ 502 int 503 dk_lookup(path, p, vpp) 504 char *path; 505 struct proc *p; 506 struct vnode **vpp; /* result */ 507 { 508 struct nameidata nd; 509 struct vnode *vp; 510 struct vattr va; 511 int error; 512 513 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, path, p); 514 if ((error = vn_open(&nd, FREAD|FWRITE, 0)) != 0) { 515 DPRINTF((DKDB_FOLLOW|DKDB_INIT), 516 ("dk_lookup: vn_open error = %d\n", error)); 517 return (error); 518 } 519 vp = nd.ni_vp; 520 521 if (vp->v_usecount > 1) { 522 VOP_UNLOCK(vp, 0); 523 (void)vn_close(vp, FREAD|FWRITE, p->p_ucred, p); 524 return (EBUSY); 525 } 526 527 if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p)) != 0) { 528 DPRINTF((DKDB_FOLLOW|DKDB_INIT), 529 ("dk_lookup: getattr error = %d\n", error)); 530 VOP_UNLOCK(vp, 0); 531 (void)vn_close(vp, FREAD|FWRITE, p->p_ucred, p); 532 return (error); 533 } 534 535 /* XXX: eventually we should handle VREG, too. */ 536 if (va.va_type != VBLK) { 537 VOP_UNLOCK(vp, 0); 538 (void)vn_close(vp, FREAD|FWRITE, p->p_ucred, p); 539 return (ENOTBLK); 540 } 541 542 IFDEBUG(DKDB_VNODE, vprint("dk_lookup: vnode info", vp)); 543 544 VOP_UNLOCK(vp, 0); 545 *vpp = vp; 546 return (0); 547 } 548
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