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subr_disk_open.c revision 1.6 
      1 /*	$NetBSD: subr_disk_open.c,v 1.6 2011/11/27 00:38:12 tsutsui Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2006 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     18  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     26  * POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #include <sys/cdefs.h>
     30 __KERNEL_RCSID(0, "$NetBSD: subr_disk_open.c,v 1.6 2011/11/27 00:38:12 tsutsui Exp $");
     31 
     32 #include <sys/param.h>
     33 #include <sys/conf.h>
     34 #include <sys/device.h>
     35 #include <sys/disk.h>
     36 #include <sys/disklabel.h>
     37 #include <sys/fcntl.h>
     38 #include <sys/kauth.h>
     39 #include <sys/vnode.h>
     40 #include <miscfs/specfs/specdev.h>
     41 
     42 struct vnode *
     43 opendisk(struct device *dv)
     44 {
     45 	int bmajor, bminor;
     46 	struct vnode *tmpvn;
     47 	int error;
     48 	dev_t dev;
     49 
     50 	/*
     51 	 * Lookup major number for disk block device.
     52 	 */
     53 	bmajor = devsw_name2blk(device_xname(dv), NULL, 0);
     54 	if (bmajor == -1)
     55 		return NULL;
     56 
     57 	bminor = minor(device_unit(dv));
     58 	/*
     59 	 * Fake a temporary vnode for the disk, open it, and read
     60 	 * and hash the sectors.
     61 	 */
     62 	dev = device_is_a(dv, "dk") ? makedev(bmajor, bminor) :
     63 	    MAKEDISKDEV(bmajor, bminor, RAW_PART);
     64 	if (bdevvp(dev, &tmpvn))
     65 		panic("%s: can't alloc vnode for %s", __func__,
     66 		    device_xname(dv));
     67 	error = VOP_OPEN(tmpvn, FREAD | FSILENT, NOCRED);
     68 	if (error) {
     69 #ifndef DEBUG
     70 		/*
     71 		 * Ignore errors caused by missing device, partition,
     72 		 * or medium.
     73 		 */
     74 		if (error != ENXIO && error != ENODEV)
     75 #endif
     76 			printf("%s: can't open dev %s (%d)\n",
     77 			    __func__, device_xname(dv), error);
     78 		vput(tmpvn);
     79 		return NULL;
     80 	}
     81 
     82 	return tmpvn;
     83 }
     84 
     85 int
     86 getdisksize(struct vnode *vp, uint64_t *numsecp, unsigned *secsizep)
     87 {
     88 	struct partinfo dpart;
     89 	struct dkwedge_info dkw;
     90 	struct disk *pdk;
     91 	int error;
     92 
     93 	error = VOP_IOCTL(vp, DIOCGPART, &dpart, FREAD, NOCRED);
     94 	if (error == 0) {
     95 		*secsizep = dpart.disklab->d_secsize;
     96 		*numsecp  = dpart.part->p_size;
     97 		return 0;
     98 	}
     99 
    100 	error = VOP_IOCTL(vp, DIOCGWEDGEINFO, &dkw, FREAD, NOCRED);
    101 	if (error == 0) {
    102 		pdk = disk_find(dkw.dkw_parent);
    103 		if (pdk != NULL) {
    104 			*secsizep = DEV_BSIZE << pdk->dk_blkshift;
    105 			*numsecp  = dkw.dkw_size;
    106 		} else
    107 			error = ENODEV;
    108 	}
    109 
    110 	return error;
    111 }
    112 
    113 int
    114 getdiskinfo(struct vnode *vp, struct dkwedge_info *dkw)
    115 {
    116 	struct partinfo dpart;
    117 	int error;
    118 	dev_t dev = vp->v_specnode->sn_rdev;
    119 
    120 	if (VOP_IOCTL(vp, DIOCGWEDGEINFO, dkw, FREAD, NOCRED) == 0)
    121 		return 0;
    122 
    123 	if ((error = VOP_IOCTL(vp, DIOCGPART, &dpart, FREAD, NOCRED)) != 0)
    124 		return error;
    125 
    126 	snprintf(dkw->dkw_devname, sizeof(dkw->dkw_devname), "%s%" PRId32 "%c",
    127 	    devsw_blk2name(major(dev)), DISKUNIT(dev), (char)DISKPART(dev) +
    128 	    'a');
    129 
    130 	dkw->dkw_wname[0] = '\0';
    131 
    132 	strlcpy(dkw->dkw_parent, dkw->dkw_devname, sizeof(dkw->dkw_parent));
    133 
    134 	dkw->dkw_size = dpart.part->p_size;
    135 	dkw->dkw_offset = dpart.part->p_offset;
    136 
    137 	strlcpy(dkw->dkw_ptype, getfstypename(dpart.part->p_fstype),
    138 	    sizeof(dkw->dkw_ptype));
    139 
    140 	return 0;
    141 }
    142