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dksubr.c revision 1.63 
      1 /* $NetBSD: dksubr.c,v 1.63 2015/05/09 13:07:20 christos 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 1.63 2015/05/09 13:07:20 christos 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 	}
    198 
    199 	if ((dksc->sc_flags & DKF_KLABEL) == 0)
    200 		dksc->sc_flags &= ~DKF_VLABEL;
    201 
    202 	mutex_exit(&dk->dk_openlock);
    203 	return 0;
    204 }
    205 
    206 void
    207 dk_strategy(struct dk_softc *dksc, struct buf *bp)
    208 {
    209 	const struct dkdriver *dkd = dksc->sc_dkdev.dk_driver;
    210 	int	s, part;
    211 	int	wlabel;
    212 	daddr_t	blkno;
    213 	struct disklabel *lp;
    214 	struct disk *dk;
    215 	uint64_t numsecs;
    216 	unsigned secsize;
    217 
    218 	DPRINTF_FOLLOW(("dk_strategy(%s, %p, %p)\n",
    219 	    dksc->sc_xname, dksc, bp));
    220 
    221 	if (!(dksc->sc_flags & DKF_INITED)) {
    222 		DPRINTF_FOLLOW(("dk_strategy: not inited\n"));
    223 		bp->b_error  = ENXIO;
    224 		biodone(bp);
    225 		return;
    226 	}
    227 
    228 	lp = dksc->sc_dkdev.dk_label;
    229 	dk = &dksc->sc_dkdev;
    230 
    231 	part = DISKPART(bp->b_dev);
    232 	numsecs = dk->dk_geom.dg_secperunit;
    233 	secsize = dk->dk_geom.dg_secsize;
    234 
    235 	bp->b_resid = bp->b_bcount;
    236 
    237 	/*
    238 	 * The transfer must be a whole number of blocks and the offset must
    239 	 * not be negative.
    240 	 */
    241 	if ((bp->b_bcount % secsize) != 0 || bp->b_blkno < 0) {
    242 		bp->b_error = EINVAL;
    243 		biodone(bp);
    244 		return;
    245 	}
    246 
    247 	/* If there is nothing to do, then we are done */
    248 	if (bp->b_bcount == 0) {
    249 		biodone(bp);
    250 		return;
    251 	}
    252 
    253 	wlabel = dksc->sc_flags & (DKF_WLABEL|DKF_LABELLING);
    254 	if (part == RAW_PART) {
    255 		if (bounds_check_with_mediasize(bp, DEV_BSIZE, numsecs) <= 0) {
    256 			biodone(bp);
    257 			return;
    258 		}
    259 	} else {
    260 		if (bounds_check_with_label(&dksc->sc_dkdev, bp, wlabel) <= 0) {
    261 			biodone(bp);
    262 			return;
    263 		}
    264 	}
    265 
    266 	blkno = bp->b_blkno;
    267 	if (part != RAW_PART)
    268 		blkno += lp->d_partitions[DISKPART(bp->b_dev)].p_offset;
    269 	bp->b_rawblkno = blkno;
    270 
    271 	/*
    272 	 * Start the unit by calling the start routine
    273 	 * provided by the individual driver.
    274 	 */
    275 	s = splbio();
    276 	bufq_put(dksc->sc_bufq, bp);
    277 	dkd->d_diskstart(dksc->sc_dev);
    278 	splx(s);
    279 	return;
    280 }
    281 
    282 void
    283 dk_done(struct dk_softc *dksc, struct buf *bp)
    284 {
    285 	struct disk *dk = &dksc->sc_dkdev;
    286 
    287 	if (bp->b_error != 0) {
    288 		diskerr(bp, dksc->sc_xname, "error", LOG_PRINTF, 0,
    289 			dk->dk_label);
    290 		printf("\n");
    291 	}
    292 
    293 	disk_unbusy(dk, bp->b_bcount - bp->b_resid, (bp->b_flags & B_READ));
    294 #ifdef notyet
    295 	rnd_add_uint(&dksc->sc_rnd_source, bp->b_rawblkno);
    296 #endif
    297 	biodone(bp);
    298 }
    299 
    300 int
    301 dk_size(struct dk_softc *dksc, dev_t dev)
    302 {
    303 	const struct dkdriver *dkd = dksc->sc_dkdev.dk_driver;
    304 	struct	disklabel *lp;
    305 	int	is_open;
    306 	int	part;
    307 	int	size;
    308 
    309 	if ((dksc->sc_flags & DKF_INITED) == 0)
    310 		return -1;
    311 
    312 	part = DISKPART(dev);
    313 	is_open = dksc->sc_dkdev.dk_openmask & (1 << part);
    314 
    315 	if (!is_open && dkd->d_open(dev, 0, S_IFBLK, curlwp))
    316 		return -1;
    317 
    318 	lp = dksc->sc_dkdev.dk_label;
    319 	if (lp->d_partitions[part].p_fstype != FS_SWAP)
    320 		size = -1;
    321 	else
    322 		size = lp->d_partitions[part].p_size *
    323 		    (lp->d_secsize / DEV_BSIZE);
    324 
    325 	if (!is_open && dkd->d_close(dev, 0, S_IFBLK, curlwp))
    326 		return -1;
    327 
    328 	return size;
    329 }
    330 
    331 int
    332 dk_ioctl(struct dk_softc *dksc, dev_t dev,
    333 	    u_long cmd, void *data, int flag, struct lwp *l)
    334 {
    335 	const struct dkdriver *dkd = dksc->sc_dkdev.dk_driver;
    336 	struct	disklabel *lp;
    337 	struct	disk *dk = &dksc->sc_dkdev;
    338 #ifdef __HAVE_OLD_DISKLABEL
    339 	struct	disklabel newlabel;
    340 #endif
    341 	int	error;
    342 
    343 	DPRINTF_FOLLOW(("dk_ioctl(%s, %p, 0x%"PRIx64", 0x%lx)\n",
    344 	    dksc->sc_xname, dksc, dev, cmd));
    345 
    346 	/* ensure that the pseudo disk is open for writes for these commands */
    347 	switch (cmd) {
    348 	case DIOCSDINFO:
    349 	case DIOCWDINFO:
    350 #ifdef __HAVE_OLD_DISKLABEL
    351 	case ODIOCSDINFO:
    352 	case ODIOCWDINFO:
    353 #endif
    354 	case DIOCWLABEL:
    355 	case DIOCAWEDGE:
    356 	case DIOCDWEDGE:
    357 		if ((flag & FWRITE) == 0)
    358 			return EBADF;
    359 	}
    360 
    361 	/* ensure that the pseudo-disk is initialized for these */
    362 	switch (cmd) {
    363 	case DIOCGDINFO:
    364 	case DIOCSDINFO:
    365 	case DIOCWDINFO:
    366 	case DIOCGPART:
    367 	case DIOCKLABEL:
    368 	case DIOCWLABEL:
    369 	case DIOCGDEFLABEL:
    370 	case DIOCAWEDGE:
    371 	case DIOCDWEDGE:
    372 	case DIOCLWEDGES:
    373 	case DIOCMWEDGES:
    374 	case DIOCCACHESYNC:
    375 #ifdef __HAVE_OLD_DISKLABEL
    376 	case ODIOCGDINFO:
    377 	case ODIOCSDINFO:
    378 	case ODIOCWDINFO:
    379 	case ODIOCGDEFLABEL:
    380 #endif
    381 		if ((dksc->sc_flags & DKF_INITED) == 0)
    382 			return ENXIO;
    383 	}
    384 
    385 	error = disk_ioctl(dk, dev, cmd, data, flag, l);
    386 	if (error != EPASSTHROUGH)
    387 		return error;
    388 	else
    389 		error = 0;
    390 
    391 	switch (cmd) {
    392 	case DIOCWDINFO:
    393 	case DIOCSDINFO:
    394 #ifdef __HAVE_OLD_DISKLABEL
    395 	case ODIOCWDINFO:
    396 	case ODIOCSDINFO:
    397 #endif
    398 #ifdef __HAVE_OLD_DISKLABEL
    399 		if (cmd == ODIOCSDINFO || cmd == ODIOCWDINFO) {
    400 			memset(&newlabel, 0, sizeof newlabel);
    401 			memcpy(&newlabel, data, sizeof (struct olddisklabel));
    402 			lp = &newlabel;
    403 		} else
    404 #endif
    405 		lp = (struct disklabel *)data;
    406 
    407 		mutex_enter(&dk->dk_openlock);
    408 		dksc->sc_flags |= DKF_LABELLING;
    409 
    410 		error = setdisklabel(dksc->sc_dkdev.dk_label,
    411 		    lp, 0, dksc->sc_dkdev.dk_cpulabel);
    412 		if (error == 0) {
    413 			if (cmd == DIOCWDINFO
    414 #ifdef __HAVE_OLD_DISKLABEL
    415 			    || cmd == ODIOCWDINFO
    416 #endif
    417 			   )
    418 				error = writedisklabel(DKLABELDEV(dev),
    419 				    dkd->d_strategy, dksc->sc_dkdev.dk_label,
    420 				    dksc->sc_dkdev.dk_cpulabel);
    421 		}
    422 
    423 		dksc->sc_flags &= ~DKF_LABELLING;
    424 		mutex_exit(&dk->dk_openlock);
    425 		break;
    426 
    427 	case DIOCKLABEL:
    428 		if ((flag & FWRITE) == 0)
    429 			return (EBADF);
    430 		if (*(int *)data != 0)
    431 			dksc->sc_flags |= DKF_KLABEL;
    432 		else
    433 			dksc->sc_flags &= ~DKF_KLABEL;
    434 		break;
    435 
    436 	case DIOCWLABEL:
    437 		if (*(int *)data != 0)
    438 			dksc->sc_flags |= DKF_WLABEL;
    439 		else
    440 			dksc->sc_flags &= ~DKF_WLABEL;
    441 		break;
    442 
    443 	case DIOCGDEFLABEL:
    444 		dk_getdefaultlabel(dksc, (struct disklabel *)data);
    445 		break;
    446 
    447 #ifdef __HAVE_OLD_DISKLABEL
    448 	case ODIOCGDEFLABEL:
    449 		dk_getdefaultlabel(dksc, &newlabel);
    450 		if (newlabel.d_npartitions > OLDMAXPARTITIONS)
    451 			return ENOTTY;
    452 		memcpy(data, &newlabel, sizeof (struct olddisklabel));
    453 		break;
    454 #endif
    455 
    456 	case DIOCGSTRATEGY:
    457 	    {
    458 		struct disk_strategy *dks = (void *)data;
    459 		int s;
    460 
    461 		s = splbio();
    462 		strlcpy(dks->dks_name, bufq_getstrategyname(dksc->sc_bufq),
    463 		    sizeof(dks->dks_name));
    464 		splx(s);
    465 		dks->dks_paramlen = 0;
    466 
    467 		return 0;
    468 	    }
    469 
    470 	case DIOCSSTRATEGY:
    471 	    {
    472 		struct disk_strategy *dks = (void *)data;
    473 		struct bufq_state *new;
    474 		struct bufq_state *old;
    475 		int s;
    476 
    477 		if ((flag & FWRITE) == 0) {
    478 			return EBADF;
    479 		}
    480 		if (dks->dks_param != NULL) {
    481 			return EINVAL;
    482 		}
    483 		dks->dks_name[sizeof(dks->dks_name) - 1] = 0; /* ensure term */
    484 		error = bufq_alloc(&new, dks->dks_name,
    485 		    BUFQ_EXACT|BUFQ_SORT_RAWBLOCK);
    486 		if (error) {
    487 			return error;
    488 		}
    489 		s = splbio();
    490 		old = dksc->sc_bufq;
    491 		bufq_move(new, old);
    492 		dksc->sc_bufq = new;
    493 		splx(s);
    494 		bufq_free(old);
    495 
    496 		return 0;
    497 	    }
    498 
    499 	default:
    500 		error = ENOTTY;
    501 	}
    502 
    503 	return error;
    504 }
    505 
    506 /*
    507  * dk_dump dumps all of physical memory into the partition specified.
    508  * This requires substantially more framework than {s,w}ddump, and hence
    509  * is probably much more fragile.
    510  *
    511  */
    512 
    513 #define DKF_READYFORDUMP	(DKF_INITED|DKF_TAKEDUMP)
    514 #define DKFF_READYFORDUMP(x)	(((x) & DKF_READYFORDUMP) == DKF_READYFORDUMP)
    515 static volatile int	dk_dumping = 0;
    516 
    517 /* ARGSUSED */
    518 int
    519 dk_dump(struct dk_softc *dksc, dev_t dev,
    520     daddr_t blkno, void *vav, size_t size)
    521 {
    522 	const struct dkdriver *dkd = dksc->sc_dkdev.dk_driver;
    523 	char *va = vav;
    524 	struct disklabel *lp;
    525 	int part, towrt, nsects, sectoff, maxblkcnt, nblk;
    526 	int maxxfer, rv = 0;
    527 
    528 	/*
    529 	 * ensure that we consider this device to be safe for dumping,
    530 	 * and that the device is configured.
    531 	 */
    532 	if (!DKFF_READYFORDUMP(dksc->sc_flags))
    533 		return ENXIO;
    534 
    535 	/* ensure that we are not already dumping */
    536 	if (dk_dumping)
    537 		return EFAULT;
    538 	dk_dumping = 1;
    539 
    540 	if (dkd->d_dumpblocks == NULL)
    541 		return ENXIO;
    542 
    543 	/* device specific max transfer size */
    544 	maxxfer = MAXPHYS;
    545 	if (dkd->d_iosize != NULL)
    546 		(*dkd->d_iosize)(dksc->sc_dev, &maxxfer);
    547 
    548 	/* Convert to disk sectors.  Request must be a multiple of size. */
    549 	part = DISKPART(dev);
    550 	lp = dksc->sc_dkdev.dk_label;
    551 	if ((size % lp->d_secsize) != 0)
    552 		return (EFAULT);
    553 	towrt = size / lp->d_secsize;
    554 	blkno = dbtob(blkno) / lp->d_secsize;   /* blkno in secsize units */
    555 
    556 	nsects = lp->d_partitions[part].p_size;
    557 	sectoff = lp->d_partitions[part].p_offset;
    558 
    559 	/* Check transfer bounds against partition size. */
    560 	if ((blkno < 0) || ((blkno + towrt) > nsects))
    561 		return (EINVAL);
    562 
    563 	/* Offset block number to start of partition. */
    564 	blkno += sectoff;
    565 
    566 	/* Start dumping and return when done. */
    567 	maxblkcnt = howmany(maxxfer, lp->d_secsize);
    568 	while (towrt > 0) {
    569 		nblk = min(maxblkcnt, towrt);
    570 
    571 		if ((rv = (*dkd->d_dumpblocks)(dksc->sc_dev, va, blkno, nblk)) != 0)
    572 			return (rv);
    573 
    574 		towrt -= nblk;
    575 		blkno += nblk;
    576 		va += nblk * lp->d_secsize;
    577 	}
    578 
    579 	dk_dumping = 0;
    580 
    581 	return 0;
    582 }
    583 
    584 /* ARGSUSED */
    585 void
    586 dk_getdefaultlabel(struct dk_softc *dksc, struct disklabel *lp)
    587 {
    588 	struct disk_geom *dg = &dksc->sc_dkdev.dk_geom;
    589 
    590 	memset(lp, 0, sizeof(*lp));
    591 
    592 	if (dg->dg_secperunit > UINT32_MAX)
    593 		lp->d_secperunit = UINT32_MAX;
    594 	else
    595 		lp->d_secperunit = dg->dg_secperunit;
    596 	lp->d_secsize = dg->dg_secsize;
    597 	lp->d_nsectors = dg->dg_nsectors;
    598 	lp->d_ntracks = dg->dg_ntracks;
    599 	lp->d_ncylinders = dg->dg_ncylinders;
    600 	lp->d_secpercyl = lp->d_ntracks * lp->d_nsectors;
    601 
    602 	strlcpy(lp->d_typename, dksc->sc_xname, sizeof(lp->d_typename));
    603 	lp->d_type = dksc->sc_dtype;
    604 	strlcpy(lp->d_packname, "fictitious", sizeof(lp->d_packname));
    605 	lp->d_rpm = 3600;
    606 	lp->d_interleave = 1;
    607 	lp->d_flags = 0;
    608 
    609 	lp->d_partitions[RAW_PART].p_offset = 0;
    610 	lp->d_partitions[RAW_PART].p_size = lp->d_secperunit;
    611 	lp->d_partitions[RAW_PART].p_fstype = FS_UNUSED;
    612 	lp->d_npartitions = RAW_PART + 1;
    613 
    614 	lp->d_magic = DISKMAGIC;
    615 	lp->d_magic2 = DISKMAGIC;
    616 	lp->d_checksum = dkcksum(dksc->sc_dkdev.dk_label);
    617 }
    618 
    619 /* ARGSUSED */
    620 void
    621 dk_getdisklabel(struct dk_softc *dksc, dev_t dev)
    622 {
    623 	const struct dkdriver *dkd = dksc->sc_dkdev.dk_driver;
    624 	struct	 disklabel *lp = dksc->sc_dkdev.dk_label;
    625 	struct	 cpu_disklabel *clp = dksc->sc_dkdev.dk_cpulabel;
    626 	struct   disk_geom *dg = &dksc->sc_dkdev.dk_geom;
    627 	struct	 partition *pp;
    628 	int	 i;
    629 	const char	*errstring;
    630 
    631 	memset(clp, 0x0, sizeof(*clp));
    632 	dk_getdefaultlabel(dksc, lp);
    633 	errstring = readdisklabel(DKLABELDEV(dev), dkd->d_strategy,
    634 	    dksc->sc_dkdev.dk_label, dksc->sc_dkdev.dk_cpulabel);
    635 	if (errstring) {
    636 		dk_makedisklabel(dksc);
    637 		if (dksc->sc_flags & DKF_WARNLABEL)
    638 			printf("%s: %s\n", dksc->sc_xname, errstring);
    639 		return;
    640 	}
    641 
    642 	if ((dksc->sc_flags & DKF_LABELSANITY) == 0)
    643 		return;
    644 
    645 	/* Sanity check */
    646 	if (lp->d_secperunit < UINT32_MAX ?
    647 		lp->d_secperunit != dg->dg_secperunit :
    648 		lp->d_secperunit > dg->dg_secperunit)
    649 		printf("WARNING: %s: total sector size in disklabel (%ju) "
    650 		    "!= the size of %s (%ju)\n", dksc->sc_xname,
    651 		    (uintmax_t)lp->d_secperunit, dksc->sc_xname,
    652 		    (uintmax_t)dg->dg_secperunit);
    653 
    654 	for (i=0; i < lp->d_npartitions; i++) {
    655 		pp = &lp->d_partitions[i];
    656 		if (pp->p_offset + pp->p_size > dg->dg_secperunit)
    657 			printf("WARNING: %s: end of partition `%c' exceeds "
    658 			    "the size of %s (%ju)\n", dksc->sc_xname,
    659 			    'a' + i, dksc->sc_xname,
    660 			    (uintmax_t)dg->dg_secperunit);
    661 	}
    662 }
    663 
    664 /* ARGSUSED */
    665 static void
    666 dk_makedisklabel(struct dk_softc *dksc)
    667 {
    668 	struct	disklabel *lp = dksc->sc_dkdev.dk_label;
    669 
    670 	lp->d_partitions[RAW_PART].p_fstype = FS_BSDFFS;
    671 	strlcpy(lp->d_packname, "default label", sizeof(lp->d_packname));
    672 	lp->d_checksum = dkcksum(lp);
    673 }
    674 
    675 /* This function is taken from ccd.c:1.76  --rcd */
    676 
    677 /*
    678  * XXX this function looks too generic for dksubr.c, shouldn't we
    679  *     put it somewhere better?
    680  */
    681 
    682 /*
    683  * Lookup the provided name in the filesystem.  If the file exists,
    684  * is a valid block device, and isn't being used by anyone else,
    685  * set *vpp to the file's vnode.
    686  */
    687 int
    688 dk_lookup(struct pathbuf *pb, struct lwp *l, struct vnode **vpp)
    689 {
    690 	struct nameidata nd;
    691 	struct vnode *vp;
    692 	int     error;
    693 
    694 	if (l == NULL)
    695 		return ESRCH;	/* Is ESRCH the best choice? */
    696 
    697 	NDINIT(&nd, LOOKUP, FOLLOW, pb);
    698 	if ((error = vn_open(&nd, FREAD | FWRITE, 0)) != 0) {
    699 		DPRINTF((DKDB_FOLLOW|DKDB_INIT),
    700 		    ("dk_lookup: vn_open error = %d\n", error));
    701 		return error;
    702 	}
    703 
    704 	vp = nd.ni_vp;
    705 	if (vp->v_type != VBLK) {
    706 		error = ENOTBLK;
    707 		goto out;
    708 	}
    709 
    710 	/* Reopen as anonymous vnode to protect against forced unmount. */
    711 	if ((error = bdevvp(vp->v_rdev, vpp)) != 0)
    712 		goto out;
    713 	VOP_UNLOCK(vp);
    714 	if ((error = vn_close(vp, FREAD | FWRITE, l->l_cred)) != 0) {
    715 		vrele(*vpp);
    716 		return error;
    717 	}
    718 	if ((error = VOP_OPEN(*vpp, FREAD | FWRITE, l->l_cred)) != 0) {
    719 		vrele(*vpp);
    720 		return error;
    721 	}
    722 	mutex_enter((*vpp)->v_interlock);
    723 	(*vpp)->v_writecount++;
    724 	mutex_exit((*vpp)->v_interlock);
    725 
    726 	IFDEBUG(DKDB_VNODE, vprint("dk_lookup: vnode info", *vpp));
    727 
    728 	return 0;
    729 out:
    730 	VOP_UNLOCK(vp);
    731 	(void) vn_close(vp, FREAD | FWRITE, l->l_cred);
    732 	return error;
    733 }
    734 
    735 MODULE(MODULE_CLASS_MISC, dk_subr, NULL);
    736 
    737 static int
    738 dk_subr_modcmd(modcmd_t cmd, void *arg)
    739 {
    740 	switch (cmd) {
    741 	case MODULE_CMD_INIT:
    742 	case MODULE_CMD_FINI:
    743 		return 0;
    744 	case MODULE_CMD_STAT:
    745 	case MODULE_CMD_AUTOUNLOAD:
    746 	default:
    747 		return ENOTTY;
    748 	}
    749 }
    750