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dksubr.c revision 1.64 
      1 /* $NetBSD: dksubr.c,v 1.64 2015/07/11 09:45:16 mlelstv Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 1996, 1997, 1998, 1999, 2002, 2008 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  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 __KERNEL_RCSID(0, "$NetBSD: dksubr.c,v 1.64 2015/07/11 09:45:16 mlelstv Exp $");
     34 
     35 #include <sys/param.h>
     36 #include <sys/systm.h>
     37 #include <sys/stat.h>
     38 #include <sys/proc.h>
     39 #include <sys/ioctl.h>
     40 #include <sys/device.h>
     41 #include <sys/disk.h>
     42 #include <sys/disklabel.h>
     43 #include <sys/buf.h>
     44 #include <sys/bufq.h>
     45 #include <sys/vnode.h>
     46 #include <sys/fcntl.h>
     47 #include <sys/namei.h>
     48 #include <sys/module.h>
     49 #include <sys/syslog.h>
     50 
     51 #include <dev/dkvar.h>
     52 #include <miscfs/specfs/specdev.h> /* for v_rdev */
     53 
     54 int	dkdebug = 0;
     55 
     56 #ifdef DEBUG
     57 #define DKDB_FOLLOW	0x1
     58 #define DKDB_INIT	0x2
     59 #define DKDB_VNODE	0x4
     60 
     61 #define IFDEBUG(x,y)		if (dkdebug & (x)) y
     62 #define DPRINTF(x,y)		IFDEBUG(x, printf y)
     63 #define DPRINTF_FOLLOW(y)	DPRINTF(DKDB_FOLLOW, y)
     64 #else
     65 #define IFDEBUG(x,y)
     66 #define DPRINTF(x,y)
     67 #define DPRINTF_FOLLOW(y)
     68 #endif
     69 
     70 static int dk_subr_modcmd(modcmd_t, void *);
     71 
     72 #define DKLABELDEV(dev)	\
     73 	(MAKEDISKDEV(major((dev)), DISKUNIT((dev)), RAW_PART))
     74 
     75 static void	dk_makedisklabel(struct dk_softc *);
     76 
     77 void
     78 dk_init(struct dk_softc *dksc, device_t dev, int dtype)
     79 {
     80 
     81 	memset(dksc, 0x0, sizeof(*dksc));
     82 	dksc->sc_dtype = dtype;
     83 	dksc->sc_dev = dev;
     84 
     85 	strlcpy(dksc->sc_xname, device_xname(dev), DK_XNAME_SIZE);
     86 	dksc->sc_dkdev.dk_name = dksc->sc_xname;
     87 }
     88 
     89 void
     90 dk_attach(struct dk_softc *dksc)
     91 {
     92 	dksc->sc_flags |= DKF_INITED;
     93 #ifdef DIAGNOSTIC
     94 	dksc->sc_flags |= DKF_WARNLABEL | DKF_LABELSANITY;
     95 #endif
     96 }
     97 
     98 void
     99 dk_detach(struct dk_softc *dksc)
    100 {
    101 	dksc->sc_flags &= ~DKF_INITED;
    102 }
    103 
    104 /* ARGSUSED */
    105 int
    106 dk_open(struct dk_softc *dksc, dev_t dev,
    107     int flags, int fmt, struct lwp *l)
    108 {
    109 	struct	disklabel *lp = dksc->sc_dkdev.dk_label;
    110 	int	part = DISKPART(dev);
    111 	int	pmask = 1 << part;
    112 	int	ret = 0;
    113 	struct disk *dk = &dksc->sc_dkdev;
    114 
    115 	DPRINTF_FOLLOW(("dk_open(%s, %p, 0x%"PRIx64", 0x%x)\n",
    116 	    dksc->sc_xname, dksc, dev, flags));
    117 
    118 	mutex_enter(&dk->dk_openlock);
    119 	part = DISKPART(dev);
    120 
    121 	/*
    122 	 * If there are wedges, and this is not RAW_PART, then we
    123 	 * need to fail.
    124 	 */
    125 	if (dk->dk_nwedges != 0 && part != RAW_PART) {
    126 		ret = EBUSY;
    127 		goto done;
    128 	}
    129 
    130 	pmask = 1 << part;
    131 
    132 	/*
    133 	 * If we're init'ed and there are no other open partitions then
    134 	 * update the in-core disklabel.
    135 	 */
    136 	if ((dksc->sc_flags & DKF_INITED)) {
    137 		if ((dksc->sc_flags & DKF_VLABEL) == 0) {
    138 			dksc->sc_flags |= DKF_VLABEL;
    139 			dk_getdisklabel(dksc, dev);
    140 		}
    141 	}
    142 
    143 	/* Fail if we can't find the partition. */
    144 	if (part != RAW_PART &&
    145 	    ((dksc->sc_flags & DKF_VLABEL) == 0 ||
    146 	     part >= lp->d_npartitions ||
    147 	     lp->d_partitions[part].p_fstype == FS_UNUSED)) {
    148 		ret = ENXIO;
    149 		goto done;
    150 	}
    151 
    152 	/* Mark our unit as open. */
    153 	switch (fmt) {
    154 	case S_IFCHR:
    155 		dk->dk_copenmask |= pmask;
    156 		break;
    157 	case S_IFBLK:
    158 		dk->dk_bopenmask |= pmask;
    159 		break;
    160 	}
    161 
    162 	dk->dk_openmask = dk->dk_copenmask | dk->dk_bopenmask;
    163 
    164 done:
    165 	mutex_exit(&dk->dk_openlock);
    166 	return ret;
    167 }
    168 
    169 /* ARGSUSED */
    170 int
    171 dk_close(struct dk_softc *dksc, dev_t dev,
    172     int flags, int fmt, struct lwp *l)
    173 {
    174 	const struct dkdriver *dkd = dksc->sc_dkdev.dk_driver;
    175 	int	part = DISKPART(dev);
    176 	int	pmask = 1 << part;
    177 	struct disk *dk = &dksc->sc_dkdev;
    178 
    179 	DPRINTF_FOLLOW(("dk_close(%s, %p, 0x%"PRIx64", 0x%x)\n",
    180 	    dksc->sc_xname, dksc, dev, flags));
    181 
    182 	mutex_enter(&dk->dk_openlock);
    183 
    184 	switch (fmt) {
    185 	case S_IFCHR:
    186 		dk->dk_copenmask &= ~pmask;
    187 		break;
    188 	case S_IFBLK:
    189 		dk->dk_bopenmask &= ~pmask;
    190 		break;
    191 	}
    192 	dk->dk_openmask = dk->dk_copenmask | dk->dk_bopenmask;
    193 
    194 	if (dk->dk_openmask == 0) {
    195 		if (dkd->d_lastclose != NULL)
    196 			(*dkd->d_lastclose)(dksc->sc_dev);
    197 		if ((dksc->sc_flags & DKF_KLABEL) == 0)
    198 			dksc->sc_flags &= ~DKF_VLABEL;
    199 	}
    200 
    201 	mutex_exit(&dk->dk_openlock);
    202 	return 0;
    203 }
    204 
    205 void
    206 dk_strategy(struct dk_softc *dksc, struct buf *bp)
    207 {
    208 	const struct dkdriver *dkd = dksc->sc_dkdev.dk_driver;
    209 	int	s, part;
    210 	int	wlabel;
    211 	daddr_t	blkno;
    212 	struct disklabel *lp;
    213 	struct disk *dk;
    214 	uint64_t numsecs;
    215 	unsigned secsize;
    216 
    217 	DPRINTF_FOLLOW(("dk_strategy(%s, %p, %p)\n",
    218 	    dksc->sc_xname, dksc, bp));
    219 
    220 	if (!(dksc->sc_flags & DKF_INITED)) {
    221 		DPRINTF_FOLLOW(("dk_strategy: not inited\n"));
    222 		bp->b_error  = ENXIO;
    223 		biodone(bp);
    224 		return;
    225 	}
    226 
    227 	lp = dksc->sc_dkdev.dk_label;
    228 	dk = &dksc->sc_dkdev;
    229 
    230 	part = DISKPART(bp->b_dev);
    231 	numsecs = dk->dk_geom.dg_secperunit;
    232 	secsize = dk->dk_geom.dg_secsize;
    233 
    234 	bp->b_resid = bp->b_bcount;
    235 
    236 	/*
    237 	 * The transfer must be a whole number of blocks and the offset must
    238 	 * not be negative.
    239 	 */
    240 	if ((bp->b_bcount % secsize) != 0 || bp->b_blkno < 0) {
    241 		bp->b_error = EINVAL;
    242 		biodone(bp);
    243 		return;
    244 	}
    245 
    246 	/* If there is nothing to do, then we are done */
    247 	if (bp->b_bcount == 0) {
    248 		biodone(bp);
    249 		return;
    250 	}
    251 
    252 	wlabel = dksc->sc_flags & (DKF_WLABEL|DKF_LABELLING);
    253 	if (part == RAW_PART) {
    254 		if (bounds_check_with_mediasize(bp, DEV_BSIZE, numsecs) <= 0) {
    255 			biodone(bp);
    256 			return;
    257 		}
    258 	} else {
    259 		if (bounds_check_with_label(&dksc->sc_dkdev, bp, wlabel) <= 0) {
    260 			biodone(bp);
    261 			return;
    262 		}
    263 	}
    264 
    265 	blkno = bp->b_blkno;
    266 	if (part != RAW_PART)
    267 		blkno += lp->d_partitions[DISKPART(bp->b_dev)].p_offset;
    268 	bp->b_rawblkno = blkno;
    269 
    270 	/*
    271 	 * Start the unit by calling the start routine
    272 	 * provided by the individual driver.
    273 	 */
    274 	s = splbio();
    275 	bufq_put(dksc->sc_bufq, bp);
    276 	dkd->d_diskstart(dksc->sc_dev);
    277 	splx(s);
    278 	return;
    279 }
    280 
    281 void
    282 dk_done(struct dk_softc *dksc, struct buf *bp)
    283 {
    284 	struct disk *dk = &dksc->sc_dkdev;
    285 
    286 	if (bp->b_error != 0) {
    287 		diskerr(bp, dksc->sc_xname, "error", LOG_PRINTF, 0,
    288 			dk->dk_label);
    289 		printf("\n");
    290 	}
    291 
    292 	disk_unbusy(dk, bp->b_bcount - bp->b_resid, (bp->b_flags & B_READ));
    293 #ifdef notyet
    294 	rnd_add_uint(&dksc->sc_rnd_source, bp->b_rawblkno);
    295 #endif
    296 	biodone(bp);
    297 }
    298 
    299 int
    300 dk_size(struct dk_softc *dksc, dev_t dev)
    301 {
    302 	const struct dkdriver *dkd = dksc->sc_dkdev.dk_driver;
    303 	struct	disklabel *lp;
    304 	int	is_open;
    305 	int	part;
    306 	int	size;
    307 
    308 	if ((dksc->sc_flags & DKF_INITED) == 0)
    309 		return -1;
    310 
    311 	part = DISKPART(dev);
    312 	is_open = dksc->sc_dkdev.dk_openmask & (1 << part);
    313 
    314 	if (!is_open && dkd->d_open(dev, 0, S_IFBLK, curlwp))
    315 		return -1;
    316 
    317 	lp = dksc->sc_dkdev.dk_label;
    318 	if (lp->d_partitions[part].p_fstype != FS_SWAP)
    319 		size = -1;
    320 	else
    321 		size = lp->d_partitions[part].p_size *
    322 		    (lp->d_secsize / DEV_BSIZE);
    323 
    324 	if (!is_open && dkd->d_close(dev, 0, S_IFBLK, curlwp))
    325 		return -1;
    326 
    327 	return size;
    328 }
    329 
    330 int
    331 dk_ioctl(struct dk_softc *dksc, dev_t dev,
    332 	    u_long cmd, void *data, int flag, struct lwp *l)
    333 {
    334 	const struct dkdriver *dkd = dksc->sc_dkdev.dk_driver;
    335 	struct	disklabel *lp;
    336 	struct	disk *dk = &dksc->sc_dkdev;
    337 #ifdef __HAVE_OLD_DISKLABEL
    338 	struct	disklabel newlabel;
    339 #endif
    340 	int	error;
    341 
    342 	DPRINTF_FOLLOW(("dk_ioctl(%s, %p, 0x%"PRIx64", 0x%lx)\n",
    343 	    dksc->sc_xname, dksc, dev, cmd));
    344 
    345 	/* ensure that the pseudo disk is open for writes for these commands */
    346 	switch (cmd) {
    347 	case DIOCSDINFO:
    348 	case DIOCWDINFO:
    349 #ifdef __HAVE_OLD_DISKLABEL
    350 	case ODIOCSDINFO:
    351 	case ODIOCWDINFO:
    352 #endif
    353 	case DIOCWLABEL:
    354 	case DIOCAWEDGE:
    355 	case DIOCDWEDGE:
    356 		if ((flag & FWRITE) == 0)
    357 			return EBADF;
    358 	}
    359 
    360 	/* ensure that the pseudo-disk is initialized for these */
    361 	switch (cmd) {
    362 	case DIOCGDINFO:
    363 	case DIOCSDINFO:
    364 	case DIOCWDINFO:
    365 	case DIOCGPART:
    366 	case DIOCKLABEL:
    367 	case DIOCWLABEL:
    368 	case DIOCGDEFLABEL:
    369 	case DIOCAWEDGE:
    370 	case DIOCDWEDGE:
    371 	case DIOCLWEDGES:
    372 	case DIOCMWEDGES:
    373 	case DIOCCACHESYNC:
    374 #ifdef __HAVE_OLD_DISKLABEL
    375 	case ODIOCGDINFO:
    376 	case ODIOCSDINFO:
    377 	case ODIOCWDINFO:
    378 	case ODIOCGDEFLABEL:
    379 #endif
    380 		if ((dksc->sc_flags & DKF_INITED) == 0)
    381 			return ENXIO;
    382 	}
    383 
    384 	error = disk_ioctl(dk, dev, cmd, data, flag, l);
    385 	if (error != EPASSTHROUGH)
    386 		return error;
    387 	else
    388 		error = 0;
    389 
    390 	switch (cmd) {
    391 	case DIOCWDINFO:
    392 	case DIOCSDINFO:
    393 #ifdef __HAVE_OLD_DISKLABEL
    394 	case ODIOCWDINFO:
    395 	case ODIOCSDINFO:
    396 #endif
    397 #ifdef __HAVE_OLD_DISKLABEL
    398 		if (cmd == ODIOCSDINFO || cmd == ODIOCWDINFO) {
    399 			memset(&newlabel, 0, sizeof newlabel);
    400 			memcpy(&newlabel, data, sizeof (struct olddisklabel));
    401 			lp = &newlabel;
    402 		} else
    403 #endif
    404 		lp = (struct disklabel *)data;
    405 
    406 		mutex_enter(&dk->dk_openlock);
    407 		dksc->sc_flags |= DKF_LABELLING;
    408 
    409 		error = setdisklabel(dksc->sc_dkdev.dk_label,
    410 		    lp, 0, dksc->sc_dkdev.dk_cpulabel);
    411 		if (error == 0) {
    412 			if (cmd == DIOCWDINFO
    413 #ifdef __HAVE_OLD_DISKLABEL
    414 			    || cmd == ODIOCWDINFO
    415 #endif
    416 			   )
    417 				error = writedisklabel(DKLABELDEV(dev),
    418 				    dkd->d_strategy, dksc->sc_dkdev.dk_label,
    419 				    dksc->sc_dkdev.dk_cpulabel);
    420 		}
    421 
    422 		dksc->sc_flags &= ~DKF_LABELLING;
    423 		mutex_exit(&dk->dk_openlock);
    424 		break;
    425 
    426 	case DIOCKLABEL:
    427 		if ((flag & FWRITE) == 0)
    428 			return (EBADF);
    429 		if (*(int *)data != 0)
    430 			dksc->sc_flags |= DKF_KLABEL;
    431 		else
    432 			dksc->sc_flags &= ~DKF_KLABEL;
    433 		break;
    434 
    435 	case DIOCWLABEL:
    436 		if (*(int *)data != 0)
    437 			dksc->sc_flags |= DKF_WLABEL;
    438 		else
    439 			dksc->sc_flags &= ~DKF_WLABEL;
    440 		break;
    441 
    442 	case DIOCGDEFLABEL:
    443 		dk_getdefaultlabel(dksc, (struct disklabel *)data);
    444 		break;
    445 
    446 #ifdef __HAVE_OLD_DISKLABEL
    447 	case ODIOCGDEFLABEL:
    448 		dk_getdefaultlabel(dksc, &newlabel);
    449 		if (newlabel.d_npartitions > OLDMAXPARTITIONS)
    450 			return ENOTTY;
    451 		memcpy(data, &newlabel, sizeof (struct olddisklabel));
    452 		break;
    453 #endif
    454 
    455 	case DIOCGSTRATEGY:
    456 	    {
    457 		struct disk_strategy *dks = (void *)data;
    458 		int s;
    459 
    460 		s = splbio();
    461 		strlcpy(dks->dks_name, bufq_getstrategyname(dksc->sc_bufq),
    462 		    sizeof(dks->dks_name));
    463 		splx(s);
    464 		dks->dks_paramlen = 0;
    465 
    466 		return 0;
    467 	    }
    468 
    469 	case DIOCSSTRATEGY:
    470 	    {
    471 		struct disk_strategy *dks = (void *)data;
    472 		struct bufq_state *new;
    473 		struct bufq_state *old;
    474 		int s;
    475 
    476 		if ((flag & FWRITE) == 0) {
    477 			return EBADF;
    478 		}
    479 		if (dks->dks_param != NULL) {
    480 			return EINVAL;
    481 		}
    482 		dks->dks_name[sizeof(dks->dks_name) - 1] = 0; /* ensure term */
    483 		error = bufq_alloc(&new, dks->dks_name,
    484 		    BUFQ_EXACT|BUFQ_SORT_RAWBLOCK);
    485 		if (error) {
    486 			return error;
    487 		}
    488 		s = splbio();
    489 		old = dksc->sc_bufq;
    490 		bufq_move(new, old);
    491 		dksc->sc_bufq = new;
    492 		splx(s);
    493 		bufq_free(old);
    494 
    495 		return 0;
    496 	    }
    497 
    498 	default:
    499 		error = ENOTTY;
    500 	}
    501 
    502 	return error;
    503 }
    504 
    505 /*
    506  * dk_dump dumps all of physical memory into the partition specified.
    507  * This requires substantially more framework than {s,w}ddump, and hence
    508  * is probably much more fragile.
    509  *
    510  */
    511 
    512 #define DKF_READYFORDUMP	(DKF_INITED|DKF_TAKEDUMP)
    513 #define DKFF_READYFORDUMP(x)	(((x) & DKF_READYFORDUMP) == DKF_READYFORDUMP)
    514 static volatile int	dk_dumping = 0;
    515 
    516 /* ARGSUSED */
    517 int
    518 dk_dump(struct dk_softc *dksc, dev_t dev,
    519     daddr_t blkno, void *vav, size_t size)
    520 {
    521 	const struct dkdriver *dkd = dksc->sc_dkdev.dk_driver;
    522 	char *va = vav;
    523 	struct disklabel *lp;
    524 	int part, towrt, nsects, sectoff, maxblkcnt, nblk;
    525 	int maxxfer, rv = 0;
    526 
    527 	/*
    528 	 * ensure that we consider this device to be safe for dumping,
    529 	 * and that the device is configured.
    530 	 */
    531 	if (!DKFF_READYFORDUMP(dksc->sc_flags))
    532 		return ENXIO;
    533 
    534 	/* ensure that we are not already dumping */
    535 	if (dk_dumping)
    536 		return EFAULT;
    537 	dk_dumping = 1;
    538 
    539 	if (dkd->d_dumpblocks == NULL)
    540 		return ENXIO;
    541 
    542 	/* device specific max transfer size */
    543 	maxxfer = MAXPHYS;
    544 	if (dkd->d_iosize != NULL)
    545 		(*dkd->d_iosize)(dksc->sc_dev, &maxxfer);
    546 
    547 	/* Convert to disk sectors.  Request must be a multiple of size. */
    548 	part = DISKPART(dev);
    549 	lp = dksc->sc_dkdev.dk_label;
    550 	if ((size % lp->d_secsize) != 0)
    551 		return (EFAULT);
    552 	towrt = size / lp->d_secsize;
    553 	blkno = dbtob(blkno) / lp->d_secsize;   /* blkno in secsize units */
    554 
    555 	nsects = lp->d_partitions[part].p_size;
    556 	sectoff = lp->d_partitions[part].p_offset;
    557 
    558 	/* Check transfer bounds against partition size. */
    559 	if ((blkno < 0) || ((blkno + towrt) > nsects))
    560 		return (EINVAL);
    561 
    562 	/* Offset block number to start of partition. */
    563 	blkno += sectoff;
    564 
    565 	/* Start dumping and return when done. */
    566 	maxblkcnt = howmany(maxxfer, lp->d_secsize);
    567 	while (towrt > 0) {
    568 		nblk = min(maxblkcnt, towrt);
    569 
    570 		if ((rv = (*dkd->d_dumpblocks)(dksc->sc_dev, va, blkno, nblk)) != 0)
    571 			return (rv);
    572 
    573 		towrt -= nblk;
    574 		blkno += nblk;
    575 		va += nblk * lp->d_secsize;
    576 	}
    577 
    578 	dk_dumping = 0;
    579 
    580 	return 0;
    581 }
    582 
    583 /* ARGSUSED */
    584 void
    585 dk_getdefaultlabel(struct dk_softc *dksc, struct disklabel *lp)
    586 {
    587 	struct disk_geom *dg = &dksc->sc_dkdev.dk_geom;
    588 
    589 	memset(lp, 0, sizeof(*lp));
    590 
    591 	if (dg->dg_secperunit > UINT32_MAX)
    592 		lp->d_secperunit = UINT32_MAX;
    593 	else
    594 		lp->d_secperunit = dg->dg_secperunit;
    595 	lp->d_secsize = dg->dg_secsize;
    596 	lp->d_nsectors = dg->dg_nsectors;
    597 	lp->d_ntracks = dg->dg_ntracks;
    598 	lp->d_ncylinders = dg->dg_ncylinders;
    599 	lp->d_secpercyl = lp->d_ntracks * lp->d_nsectors;
    600 
    601 	strlcpy(lp->d_typename, dksc->sc_xname, sizeof(lp->d_typename));
    602 	lp->d_type = dksc->sc_dtype;
    603 	strlcpy(lp->d_packname, "fictitious", sizeof(lp->d_packname));
    604 	lp->d_rpm = 3600;
    605 	lp->d_interleave = 1;
    606 	lp->d_flags = 0;
    607 
    608 	lp->d_partitions[RAW_PART].p_offset = 0;
    609 	lp->d_partitions[RAW_PART].p_size = lp->d_secperunit;
    610 	lp->d_partitions[RAW_PART].p_fstype = FS_UNUSED;
    611 	lp->d_npartitions = RAW_PART + 1;
    612 
    613 	lp->d_magic = DISKMAGIC;
    614 	lp->d_magic2 = DISKMAGIC;
    615 	lp->d_checksum = dkcksum(dksc->sc_dkdev.dk_label);
    616 }
    617 
    618 /* ARGSUSED */
    619 void
    620 dk_getdisklabel(struct dk_softc *dksc, dev_t dev)
    621 {
    622 	const struct dkdriver *dkd = dksc->sc_dkdev.dk_driver;
    623 	struct	 disklabel *lp = dksc->sc_dkdev.dk_label;
    624 	struct	 cpu_disklabel *clp = dksc->sc_dkdev.dk_cpulabel;
    625 	struct   disk_geom *dg = &dksc->sc_dkdev.dk_geom;
    626 	struct	 partition *pp;
    627 	int	 i;
    628 	const char	*errstring;
    629 
    630 	memset(clp, 0x0, sizeof(*clp));
    631 	dk_getdefaultlabel(dksc, lp);
    632 	errstring = readdisklabel(DKLABELDEV(dev), dkd->d_strategy,
    633 	    dksc->sc_dkdev.dk_label, dksc->sc_dkdev.dk_cpulabel);
    634 	if (errstring) {
    635 		dk_makedisklabel(dksc);
    636 		if (dksc->sc_flags & DKF_WARNLABEL)
    637 			printf("%s: %s\n", dksc->sc_xname, errstring);
    638 		return;
    639 	}
    640 
    641 	if ((dksc->sc_flags & DKF_LABELSANITY) == 0)
    642 		return;
    643 
    644 	/* Sanity check */
    645 	if (lp->d_secperunit < UINT32_MAX ?
    646 		lp->d_secperunit != dg->dg_secperunit :
    647 		lp->d_secperunit > dg->dg_secperunit)
    648 		printf("WARNING: %s: total sector size in disklabel (%ju) "
    649 		    "!= the size of %s (%ju)\n", dksc->sc_xname,
    650 		    (uintmax_t)lp->d_secperunit, dksc->sc_xname,
    651 		    (uintmax_t)dg->dg_secperunit);
    652 
    653 	for (i=0; i < lp->d_npartitions; i++) {
    654 		pp = &lp->d_partitions[i];
    655 		if (pp->p_offset + pp->p_size > dg->dg_secperunit)
    656 			printf("WARNING: %s: end of partition `%c' exceeds "
    657 			    "the size of %s (%ju)\n", dksc->sc_xname,
    658 			    'a' + i, dksc->sc_xname,
    659 			    (uintmax_t)dg->dg_secperunit);
    660 	}
    661 }
    662 
    663 /* ARGSUSED */
    664 static void
    665 dk_makedisklabel(struct dk_softc *dksc)
    666 {
    667 	struct	disklabel *lp = dksc->sc_dkdev.dk_label;
    668 
    669 	lp->d_partitions[RAW_PART].p_fstype = FS_BSDFFS;
    670 	strlcpy(lp->d_packname, "default label", sizeof(lp->d_packname));
    671 	lp->d_checksum = dkcksum(lp);
    672 }
    673 
    674 /* This function is taken from ccd.c:1.76  --rcd */
    675 
    676 /*
    677  * XXX this function looks too generic for dksubr.c, shouldn't we
    678  *     put it somewhere better?
    679  */
    680 
    681 /*
    682  * Lookup the provided name in the filesystem.  If the file exists,
    683  * is a valid block device, and isn't being used by anyone else,
    684  * set *vpp to the file's vnode.
    685  */
    686 int
    687 dk_lookup(struct pathbuf *pb, struct lwp *l, struct vnode **vpp)
    688 {
    689 	struct nameidata nd;
    690 	struct vnode *vp;
    691 	int     error;
    692 
    693 	if (l == NULL)
    694 		return ESRCH;	/* Is ESRCH the best choice? */
    695 
    696 	NDINIT(&nd, LOOKUP, FOLLOW, pb);
    697 	if ((error = vn_open(&nd, FREAD | FWRITE, 0)) != 0) {
    698 		DPRINTF((DKDB_FOLLOW|DKDB_INIT),
    699 		    ("dk_lookup: vn_open error = %d\n", error));
    700 		return error;
    701 	}
    702 
    703 	vp = nd.ni_vp;
    704 	if (vp->v_type != VBLK) {
    705 		error = ENOTBLK;
    706 		goto out;
    707 	}
    708 
    709 	/* Reopen as anonymous vnode to protect against forced unmount. */
    710 	if ((error = bdevvp(vp->v_rdev, vpp)) != 0)
    711 		goto out;
    712 	VOP_UNLOCK(vp);
    713 	if ((error = vn_close(vp, FREAD | FWRITE, l->l_cred)) != 0) {
    714 		vrele(*vpp);
    715 		return error;
    716 	}
    717 	if ((error = VOP_OPEN(*vpp, FREAD | FWRITE, l->l_cred)) != 0) {
    718 		vrele(*vpp);
    719 		return error;
    720 	}
    721 	mutex_enter((*vpp)->v_interlock);
    722 	(*vpp)->v_writecount++;
    723 	mutex_exit((*vpp)->v_interlock);
    724 
    725 	IFDEBUG(DKDB_VNODE, vprint("dk_lookup: vnode info", *vpp));
    726 
    727 	return 0;
    728 out:
    729 	VOP_UNLOCK(vp);
    730 	(void) vn_close(vp, FREAD | FWRITE, l->l_cred);
    731 	return error;
    732 }
    733 
    734 MODULE(MODULE_CLASS_MISC, dk_subr, NULL);
    735 
    736 static int
    737 dk_subr_modcmd(modcmd_t cmd, void *arg)
    738 {
    739 	switch (cmd) {
    740 	case MODULE_CMD_INIT:
    741 	case MODULE_CMD_FINI:
    742 		return 0;
    743 	case MODULE_CMD_STAT:
    744 	case MODULE_CMD_AUTOUNLOAD:
    745 	default:
    746 		return ENOTTY;
    747 	}
    748 }
    749