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dksubr.c revision 1.50
      1 /* $NetBSD: dksubr.c,v 1.50 2014/05/25 19:23:49 bouyer 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 1.50 2014/05/25 19:23:49 bouyer 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 
     50 #include <dev/dkvar.h>
     51 
     52 int	dkdebug = 0;
     53 
     54 #ifdef DEBUG
     55 #define DKDB_FOLLOW	0x1
     56 #define DKDB_INIT	0x2
     57 #define DKDB_VNODE	0x4
     58 
     59 #define IFDEBUG(x,y)		if (dkdebug & (x)) y
     60 #define DPRINTF(x,y)		IFDEBUG(x, printf y)
     61 #define DPRINTF_FOLLOW(y)	DPRINTF(DKDB_FOLLOW, y)
     62 #else
     63 #define IFDEBUG(x,y)
     64 #define DPRINTF(x,y)
     65 #define DPRINTF_FOLLOW(y)
     66 #endif
     67 
     68 static int dk_subr_modcmd(modcmd_t, void *);
     69 
     70 #define DKLABELDEV(dev)	\
     71 	(MAKEDISKDEV(major((dev)), DISKUNIT((dev)), RAW_PART))
     72 
     73 static void	dk_makedisklabel(struct dk_intf *, struct dk_softc *);
     74 
     75 void
     76 dk_sc_init(struct dk_softc *dksc, const char *xname)
     77 {
     78 
     79 	memset(dksc, 0x0, sizeof(*dksc));
     80 	strncpy(dksc->sc_xname, xname, DK_XNAME_SIZE);
     81 	dksc->sc_dkdev.dk_name = dksc->sc_xname;
     82 }
     83 
     84 /* ARGSUSED */
     85 int
     86 dk_open(struct dk_intf *di, struct dk_softc *dksc, dev_t dev,
     87     int flags, int fmt, struct lwp *l)
     88 {
     89 	struct	disklabel *lp = dksc->sc_dkdev.dk_label;
     90 	int	part = DISKPART(dev);
     91 	int	pmask = 1 << part;
     92 	int	ret = 0;
     93 	struct disk *dk = &dksc->sc_dkdev;
     94 
     95 	DPRINTF_FOLLOW(("dk_open(%s, %p, 0x%"PRIx64", 0x%x)\n",
     96 	    di->di_dkname, dksc, dev, flags));
     97 
     98 	mutex_enter(&dk->dk_openlock);
     99 	part = DISKPART(dev);
    100 
    101 	/*
    102 	 * If there are wedges, and this is not RAW_PART, then we
    103 	 * need to fail.
    104 	 */
    105 	if (dk->dk_nwedges != 0 && part != RAW_PART) {
    106 		ret = EBUSY;
    107 		goto done;
    108 	}
    109 
    110 	pmask = 1 << part;
    111 
    112 	/*
    113 	 * If we're init'ed and there are no other open partitions then
    114 	 * update the in-core disklabel.
    115 	 */
    116 	if ((dksc->sc_flags & DKF_INITED)) {
    117 		if (dk->dk_openmask == 0) {
    118 			dk_getdisklabel(di, dksc, dev);
    119 		}
    120 		/* XXX re-discover wedges? */
    121 	}
    122 
    123 	/* Fail if we can't find the partition. */
    124 	if ((part != RAW_PART) &&
    125 	    (((dksc->sc_flags & DKF_INITED) == 0) ||
    126 	    ((part >= lp->d_npartitions) ||
    127 	    (lp->d_partitions[part].p_fstype == FS_UNUSED)))) {
    128 		ret = ENXIO;
    129 		goto done;
    130 	}
    131 
    132 	/* Mark our unit as open. */
    133 	switch (fmt) {
    134 	case S_IFCHR:
    135 		dk->dk_copenmask |= pmask;
    136 		break;
    137 	case S_IFBLK:
    138 		dk->dk_bopenmask |= pmask;
    139 		break;
    140 	}
    141 
    142 	dk->dk_openmask = dk->dk_copenmask | dk->dk_bopenmask;
    143 
    144 done:
    145 	mutex_exit(&dk->dk_openlock);
    146 	return ret;
    147 }
    148 
    149 /* ARGSUSED */
    150 int
    151 dk_close(struct dk_intf *di, struct dk_softc *dksc, dev_t dev,
    152     int flags, int fmt, struct lwp *l)
    153 {
    154 	int	part = DISKPART(dev);
    155 	int	pmask = 1 << part;
    156 	struct disk *dk = &dksc->sc_dkdev;
    157 
    158 	DPRINTF_FOLLOW(("dk_close(%s, %p, 0x%"PRIx64", 0x%x)\n",
    159 	    di->di_dkname, dksc, dev, flags));
    160 
    161 	mutex_enter(&dk->dk_openlock);
    162 
    163 	switch (fmt) {
    164 	case S_IFCHR:
    165 		dk->dk_copenmask &= ~pmask;
    166 		break;
    167 	case S_IFBLK:
    168 		dk->dk_bopenmask &= ~pmask;
    169 		break;
    170 	}
    171 	dk->dk_openmask = dk->dk_copenmask | dk->dk_bopenmask;
    172 
    173 	mutex_exit(&dk->dk_openlock);
    174 	return 0;
    175 }
    176 
    177 void
    178 dk_strategy(struct dk_intf *di, struct dk_softc *dksc, struct buf *bp)
    179 {
    180 	int	s;
    181 	int	wlabel;
    182 	daddr_t	blkno;
    183 
    184 	DPRINTF_FOLLOW(("dk_strategy(%s, %p, %p)\n",
    185 	    di->di_dkname, dksc, bp));
    186 
    187 	if (!(dksc->sc_flags & DKF_INITED)) {
    188 		DPRINTF_FOLLOW(("dk_strategy: not inited\n"));
    189 		bp->b_error  = ENXIO;
    190 		biodone(bp);
    191 		return;
    192 	}
    193 
    194 	/* XXX look for some more errors, c.f. ld.c */
    195 
    196 	bp->b_resid = bp->b_bcount;
    197 
    198 	/* If there is nothing to do, then we are done */
    199 	if (bp->b_bcount == 0) {
    200 		biodone(bp);
    201 		return;
    202 	}
    203 
    204 	wlabel = dksc->sc_flags & (DKF_WLABEL|DKF_LABELLING);
    205 	if (DISKPART(bp->b_dev) != RAW_PART &&
    206 	    bounds_check_with_label(&dksc->sc_dkdev, bp, wlabel) <= 0) {
    207 		biodone(bp);
    208 		return;
    209 	}
    210 
    211 	blkno = bp->b_blkno;
    212 	if (DISKPART(bp->b_dev) != RAW_PART) {
    213 		struct partition *pp;
    214 
    215 		pp =
    216 		    &dksc->sc_dkdev.dk_label->d_partitions[DISKPART(bp->b_dev)];
    217 		blkno += pp->p_offset;
    218 	}
    219 	bp->b_rawblkno = blkno;
    220 
    221 	/*
    222 	 * Start the unit by calling the start routine
    223 	 * provided by the individual driver.
    224 	 */
    225 	s = splbio();
    226 	bufq_put(dksc->sc_bufq, bp);
    227 	di->di_diskstart(dksc);
    228 	splx(s);
    229 	return;
    230 }
    231 
    232 int
    233 dk_size(struct dk_intf *di, struct dk_softc *dksc, dev_t dev)
    234 {
    235 	struct	disklabel *lp;
    236 	int	is_open;
    237 	int	part;
    238 	int	size;
    239 
    240 	if ((dksc->sc_flags & DKF_INITED) == 0)
    241 		return -1;
    242 
    243 	part = DISKPART(dev);
    244 	is_open = dksc->sc_dkdev.dk_openmask & (1 << part);
    245 
    246 	if (!is_open && di->di_open(dev, 0, S_IFBLK, curlwp))
    247 		return -1;
    248 
    249 	lp = dksc->sc_dkdev.dk_label;
    250 	if (lp->d_partitions[part].p_fstype != FS_SWAP)
    251 		size = -1;
    252 	else
    253 		size = lp->d_partitions[part].p_size *
    254 		    (lp->d_secsize / DEV_BSIZE);
    255 
    256 	if (!is_open && di->di_close(dev, 0, S_IFBLK, curlwp))
    257 		return 1;
    258 
    259 	return size;
    260 }
    261 
    262 int
    263 dk_ioctl(struct dk_intf *di, struct dk_softc *dksc, dev_t dev,
    264 	    u_long cmd, void *data, int flag, struct lwp *l)
    265 {
    266 	struct	disklabel *lp;
    267 	struct	disk *dk;
    268 #ifdef __HAVE_OLD_DISKLABEL
    269 	struct	disklabel newlabel;
    270 #endif
    271 	int	error = 0;
    272 
    273 	DPRINTF_FOLLOW(("dk_ioctl(%s, %p, 0x%"PRIx64", 0x%lx)\n",
    274 	    di->di_dkname, dksc, dev, cmd));
    275 
    276 	/* ensure that the pseudo disk is open for writes for these commands */
    277 	switch (cmd) {
    278 	case DIOCSDINFO:
    279 	case DIOCWDINFO:
    280 #ifdef __HAVE_OLD_DISKLABEL
    281 	case ODIOCSDINFO:
    282 	case ODIOCWDINFO:
    283 #endif
    284 	case DIOCWLABEL:
    285 	case DIOCAWEDGE:
    286 	case DIOCDWEDGE:
    287 		if ((flag & FWRITE) == 0)
    288 			return EBADF;
    289 	}
    290 
    291 	/* ensure that the pseudo-disk is initialized for these */
    292 	switch (cmd) {
    293 #ifdef DIOCGSECTORSIZE
    294 	case DIOCGSECTORSIZE:
    295 	case DIOCGMEDIASIZE:
    296 #endif
    297 	case DIOCGDINFO:
    298 	case DIOCSDINFO:
    299 	case DIOCWDINFO:
    300 	case DIOCGPART:
    301 	case DIOCWLABEL:
    302 	case DIOCGDEFLABEL:
    303 	case DIOCAWEDGE:
    304 	case DIOCDWEDGE:
    305 	case DIOCLWEDGES:
    306 	case DIOCCACHESYNC:
    307 #ifdef __HAVE_OLD_DISKLABEL
    308 	case ODIOCGDINFO:
    309 	case ODIOCSDINFO:
    310 	case ODIOCWDINFO:
    311 	case ODIOCGDEFLABEL:
    312 #endif
    313 		if ((dksc->sc_flags & DKF_INITED) == 0)
    314 			return ENXIO;
    315 	}
    316 
    317 	switch (cmd) {
    318 #ifdef DIOCGSECTORSIZE
    319 	case DIOCGSECTORSIZE:
    320 		*(u_int *)data = dksc->sc_dkdev.dk_geom.dg_secsize;
    321 		return 0;
    322 	case DIOCGMEDIASIZE:
    323 		*(off_t *)data =
    324 		    (off_t)dksc->sc_dkdev.dk_geom.dg_secsize *
    325 		    dksc->sc_dkdev.dk_geom.dg_nsectors;
    326 		return 0;
    327 #endif
    328 
    329 	case DIOCGDINFO:
    330 		*(struct disklabel *)data = *(dksc->sc_dkdev.dk_label);
    331 		break;
    332 
    333 #ifdef __HAVE_OLD_DISKLABEL
    334 	case ODIOCGDINFO:
    335 		newlabel = *(dksc->sc_dkdev.dk_label);
    336 		if (newlabel.d_npartitions > OLDMAXPARTITIONS)
    337 			return ENOTTY;
    338 		memcpy(data, &newlabel, sizeof (struct olddisklabel));
    339 		break;
    340 #endif
    341 
    342 	case DIOCGPART:
    343 		((struct partinfo *)data)->disklab = dksc->sc_dkdev.dk_label;
    344 		((struct partinfo *)data)->part =
    345 		    &dksc->sc_dkdev.dk_label->d_partitions[DISKPART(dev)];
    346 		break;
    347 
    348 	case DIOCWDINFO:
    349 	case DIOCSDINFO:
    350 #ifdef __HAVE_OLD_DISKLABEL
    351 	case ODIOCWDINFO:
    352 	case ODIOCSDINFO:
    353 #endif
    354 #ifdef __HAVE_OLD_DISKLABEL
    355 		if (cmd == ODIOCSDINFO || cmd == ODIOCWDINFO) {
    356 			memset(&newlabel, 0, sizeof newlabel);
    357 			memcpy(&newlabel, data, sizeof (struct olddisklabel));
    358 			lp = &newlabel;
    359 		} else
    360 #endif
    361 		lp = (struct disklabel *)data;
    362 
    363 		dk = &dksc->sc_dkdev;
    364 		mutex_enter(&dk->dk_openlock);
    365 		dksc->sc_flags |= DKF_LABELLING;
    366 
    367 		error = setdisklabel(dksc->sc_dkdev.dk_label,
    368 		    lp, 0, dksc->sc_dkdev.dk_cpulabel);
    369 		if (error == 0) {
    370 			if (cmd == DIOCWDINFO
    371 #ifdef __HAVE_OLD_DISKLABEL
    372 			    || cmd == ODIOCWDINFO
    373 #endif
    374 			   )
    375 				error = writedisklabel(DKLABELDEV(dev),
    376 				    di->di_strategy, dksc->sc_dkdev.dk_label,
    377 				    dksc->sc_dkdev.dk_cpulabel);
    378 		}
    379 
    380 		dksc->sc_flags &= ~DKF_LABELLING;
    381 		mutex_exit(&dk->dk_openlock);
    382 		break;
    383 
    384 	case DIOCWLABEL:
    385 		if (*(int *)data != 0)
    386 			dksc->sc_flags |= DKF_WLABEL;
    387 		else
    388 			dksc->sc_flags &= ~DKF_WLABEL;
    389 		break;
    390 
    391 	case DIOCGDEFLABEL:
    392 		dk_getdefaultlabel(di, dksc, (struct disklabel *)data);
    393 		break;
    394 
    395 #ifdef __HAVE_OLD_DISKLABEL
    396 	case ODIOCGDEFLABEL:
    397 		dk_getdefaultlabel(di, dksc, &newlabel);
    398 		if (newlabel.d_npartitions > OLDMAXPARTITIONS)
    399 			return ENOTTY;
    400 		memcpy(data, &newlabel, sizeof (struct olddisklabel));
    401 		break;
    402 #endif
    403 
    404 	case DIOCAWEDGE:
    405 	    {
    406 	    	struct dkwedge_info *dkw = (void *)data;
    407 
    408 		if ((flag & FWRITE) == 0)
    409 			return (EBADF);
    410 
    411 		/* If the ioctl happens here, the parent is us. */
    412 		strcpy(dkw->dkw_parent, dksc->sc_dkdev.dk_name);
    413 		return (dkwedge_add(dkw));
    414 	    }
    415 
    416 	case DIOCDWEDGE:
    417 	    {
    418 	    	struct dkwedge_info *dkw = (void *)data;
    419 
    420 		if ((flag & FWRITE) == 0)
    421 			return (EBADF);
    422 
    423 		/* If the ioctl happens here, the parent is us. */
    424 		strcpy(dkw->dkw_parent, dksc->sc_dkdev.dk_name);
    425 		return (dkwedge_del(dkw));
    426 	    }
    427 
    428 	case DIOCLWEDGES:
    429 	    {
    430 	    	struct dkwedge_list *dkwl = (void *)data;
    431 
    432 		return (dkwedge_list(&dksc->sc_dkdev, dkwl, l));
    433 	    }
    434 
    435 	case DIOCGSTRATEGY:
    436 	    {
    437 		struct disk_strategy *dks = (void *)data;
    438 		int s;
    439 
    440 		s = splbio();
    441 		strlcpy(dks->dks_name, bufq_getstrategyname(dksc->sc_bufq),
    442 		    sizeof(dks->dks_name));
    443 		splx(s);
    444 		dks->dks_paramlen = 0;
    445 
    446 		return 0;
    447 	    }
    448 
    449 	case DIOCSSTRATEGY:
    450 	    {
    451 		struct disk_strategy *dks = (void *)data;
    452 		struct bufq_state *new;
    453 		struct bufq_state *old;
    454 		int s;
    455 
    456 		if ((flag & FWRITE) == 0) {
    457 			return EBADF;
    458 		}
    459 		if (dks->dks_param != NULL) {
    460 			return EINVAL;
    461 		}
    462 		dks->dks_name[sizeof(dks->dks_name) - 1] = 0; /* ensure term */
    463 		error = bufq_alloc(&new, dks->dks_name,
    464 		    BUFQ_EXACT|BUFQ_SORT_RAWBLOCK);
    465 		if (error) {
    466 			return error;
    467 		}
    468 		s = splbio();
    469 		old = dksc->sc_bufq;
    470 		bufq_move(new, old);
    471 		dksc->sc_bufq = new;
    472 		splx(s);
    473 		bufq_free(old);
    474 
    475 		return 0;
    476 	    }
    477 
    478 	default:
    479 		error = ENOTTY;
    480 	}
    481 
    482 	return error;
    483 }
    484 
    485 /*
    486  * dk_dump dumps all of physical memory into the partition specified.
    487  * This requires substantially more framework than {s,w}ddump, and hence
    488  * is probably much more fragile.
    489  *
    490  * XXX: we currently do not implement this.
    491  */
    492 
    493 #define DKF_READYFORDUMP	(DKF_INITED|DKF_TAKEDUMP)
    494 #define DKFF_READYFORDUMP(x)	(((x) & DKF_READYFORDUMP) == DKF_READYFORDUMP)
    495 static volatile int	dk_dumping = 0;
    496 
    497 /* ARGSUSED */
    498 int
    499 dk_dump(struct dk_intf *di, struct dk_softc *dksc, dev_t dev,
    500     daddr_t blkno, void *va, size_t size)
    501 {
    502 
    503 	/*
    504 	 * ensure that we consider this device to be safe for dumping,
    505 	 * and that the device is configured.
    506 	 */
    507 	if (!DKFF_READYFORDUMP(dksc->sc_flags))
    508 		return ENXIO;
    509 
    510 	/* ensure that we are not already dumping */
    511 	if (dk_dumping)
    512 		return EFAULT;
    513 	dk_dumping = 1;
    514 
    515 	/* XXX: unimplemented */
    516 
    517 	dk_dumping = 0;
    518 
    519 	/* XXX: actually for now, we are going to leave this alone */
    520 	return ENXIO;
    521 }
    522 
    523 /* ARGSUSED */
    524 void
    525 dk_getdefaultlabel(struct dk_intf *di, struct dk_softc *dksc,
    526 		      struct disklabel *lp)
    527 {
    528 	struct disk_geom *dg = &dksc->sc_dkdev.dk_geom;
    529 
    530 	memset(lp, 0, sizeof(*lp));
    531 
    532 	lp->d_secperunit = dg->dg_secperunit;
    533 	lp->d_secsize = dg->dg_secsize;
    534 	lp->d_nsectors = dg->dg_nsectors;
    535 	lp->d_ntracks = dg->dg_ntracks;
    536 	lp->d_ncylinders = dg->dg_ncylinders;
    537 	lp->d_secpercyl = lp->d_ntracks * lp->d_nsectors;
    538 
    539 	strncpy(lp->d_typename, di->di_dkname, sizeof(lp->d_typename));
    540 	lp->d_type = di->di_dtype;
    541 	strncpy(lp->d_packname, "fictitious", sizeof(lp->d_packname));
    542 	lp->d_rpm = 3600;
    543 	lp->d_interleave = 1;
    544 	lp->d_flags = 0;
    545 
    546 	lp->d_partitions[RAW_PART].p_offset = 0;
    547 	lp->d_partitions[RAW_PART].p_size = dg->dg_secperunit;
    548 	lp->d_partitions[RAW_PART].p_fstype = FS_UNUSED;
    549 	lp->d_npartitions = RAW_PART + 1;
    550 
    551 	lp->d_magic = DISKMAGIC;
    552 	lp->d_magic2 = DISKMAGIC;
    553 	lp->d_checksum = dkcksum(dksc->sc_dkdev.dk_label);
    554 }
    555 
    556 /* ARGSUSED */
    557 void
    558 dk_getdisklabel(struct dk_intf *di, struct dk_softc *dksc, dev_t dev)
    559 {
    560 	struct	 disklabel *lp = dksc->sc_dkdev.dk_label;
    561 	struct	 cpu_disklabel *clp = dksc->sc_dkdev.dk_cpulabel;
    562 	struct disk_geom *dg = &dksc->sc_dkdev.dk_geom;
    563 	struct	 partition *pp;
    564 	int	 i;
    565 	const char	*errstring;
    566 
    567 	memset(clp, 0x0, sizeof(*clp));
    568 	dk_getdefaultlabel(di, dksc, lp);
    569 	errstring = readdisklabel(DKLABELDEV(dev), di->di_strategy,
    570 	    dksc->sc_dkdev.dk_label, dksc->sc_dkdev.dk_cpulabel);
    571 	if (errstring) {
    572 		dk_makedisklabel(di, dksc);
    573 		if (dksc->sc_flags & DKF_WARNLABEL)
    574 			printf("%s: %s\n", dksc->sc_xname, errstring);
    575 		return;
    576 	}
    577 
    578 	if ((dksc->sc_flags & DKF_LABELSANITY) == 0)
    579 		return;
    580 
    581 	/* Sanity check */
    582 	if (lp->d_secperunit != dg->dg_secperunit)
    583 		printf("WARNING: %s: total sector size in disklabel (%d) "
    584 		    "!= the size of %s (%" PRId64 ")\n", dksc->sc_xname,
    585 		    lp->d_secperunit, di->di_dkname, dg->dg_secperunit);
    586 
    587 	for (i=0; i < lp->d_npartitions; i++) {
    588 		pp = &lp->d_partitions[i];
    589 		if (pp->p_offset + pp->p_size > dg->dg_secperunit)
    590 			printf("WARNING: %s: end of partition `%c' exceeds "
    591 			    "the size of %s (%" PRId64 ")\n", dksc->sc_xname,
    592 			    'a' + i, di->di_dkname, dg->dg_secperunit);
    593 	}
    594 }
    595 
    596 /* ARGSUSED */
    597 static void
    598 dk_makedisklabel(struct dk_intf *di, struct dk_softc *dksc)
    599 {
    600 	struct	disklabel *lp = dksc->sc_dkdev.dk_label;
    601 
    602 	lp->d_partitions[RAW_PART].p_fstype = FS_BSDFFS;
    603 	strncpy(lp->d_packname, "default label", sizeof(lp->d_packname));
    604 	lp->d_checksum = dkcksum(lp);
    605 }
    606 
    607 /* This function is taken from ccd.c:1.76  --rcd */
    608 
    609 /*
    610  * XXX this function looks too generic for dksubr.c, shouldn't we
    611  *     put it somewhere better?
    612  */
    613 
    614 /*
    615  * Lookup the provided name in the filesystem.  If the file exists,
    616  * is a valid block device, and isn't being used by anyone else,
    617  * set *vpp to the file's vnode.
    618  */
    619 int
    620 dk_lookup(struct pathbuf *pb, struct lwp *l, struct vnode **vpp)
    621 {
    622 	struct nameidata nd;
    623 	struct vnode *vp;
    624 	struct vattr va;
    625 	int     error;
    626 
    627 	if (l == NULL)
    628 		return ESRCH;	/* Is ESRCH the best choice? */
    629 
    630 	NDINIT(&nd, LOOKUP, FOLLOW, pb);
    631 	if ((error = vn_open(&nd, FREAD | FWRITE, 0)) != 0) {
    632 		DPRINTF((DKDB_FOLLOW|DKDB_INIT),
    633 		    ("dk_lookup: vn_open error = %d\n", error));
    634 		return error;
    635 	}
    636 
    637 	vp = nd.ni_vp;
    638 	if ((error = VOP_GETATTR(vp, &va, l->l_cred)) != 0) {
    639 		DPRINTF((DKDB_FOLLOW|DKDB_INIT),
    640 		    ("dk_lookup: getattr error = %d\n", error));
    641 		goto out;
    642 	}
    643 
    644 	/* XXX: eventually we should handle VREG, too. */
    645 	if (va.va_type != VBLK) {
    646 		error = ENOTBLK;
    647 		goto out;
    648 	}
    649 
    650 	IFDEBUG(DKDB_VNODE, vprint("dk_lookup: vnode info", vp));
    651 
    652 	VOP_UNLOCK(vp);
    653 	*vpp = vp;
    654 	return 0;
    655 out:
    656 	VOP_UNLOCK(vp);
    657 	(void) vn_close(vp, FREAD | FWRITE, l->l_cred);
    658 	return error;
    659 }
    660 
    661 MODULE(MODULE_CLASS_MISC, dk_subr, NULL);
    662 
    663 static int
    664 dk_subr_modcmd(modcmd_t cmd, void *arg)
    665 {
    666 	switch (cmd) {
    667 	case MODULE_CMD_INIT:
    668 	case MODULE_CMD_FINI:
    669 		return 0;
    670 	case MODULE_CMD_STAT:
    671 	case MODULE_CMD_AUTOUNLOAD:
    672 	default:
    673 		return ENOTTY;
    674 	}
    675 }
    676