111 lines
3.2 KiB
C
111 lines
3.2 KiB
C
/* $NetBSD: subr_disk_open.c,v 1.3 2011/07/30 12:08:36 jmcneill Exp $ */
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/*-
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* Copyright (c) 2006 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: subr_disk_open.c,v 1.3 2011/07/30 12:08:36 jmcneill Exp $");
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#include <sys/param.h>
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#include <sys/conf.h>
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#include <sys/device.h>
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#include <sys/disk.h>
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#include <sys/disklabel.h>
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#include <sys/fcntl.h>
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#include <sys/kauth.h>
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#include <sys/vnode.h>
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struct vnode *
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opendisk(struct device *dv)
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{
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int bmajor, bminor;
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struct vnode *tmpvn;
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int error;
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dev_t dev;
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/*
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* Lookup major number for disk block device.
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*/
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bmajor = devsw_name2blk(device_xname(dv), NULL, 0);
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if (bmajor == -1)
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return NULL;
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bminor = minor(device_unit(dv));
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/*
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* Fake a temporary vnode for the disk, open it, and read
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* and hash the sectors.
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*/
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dev = device_is_a(dv, "dk") ? makedev(bmajor, bminor) :
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MAKEDISKDEV(bmajor, bminor, RAW_PART);
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if (bdevvp(dev, &tmpvn))
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panic("%s: can't alloc vnode for %s", __func__,
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device_xname(dv));
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error = VOP_OPEN(tmpvn, FREAD | FSILENT, NOCRED);
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if (error) {
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#ifndef DEBUG
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/*
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* Ignore errors caused by missing device, partition,
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* or medium.
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*/
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if (error != ENXIO && error != ENODEV)
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#endif
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printf("%s: can't open dev %s (%d)\n",
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__func__, device_xname(dv), error);
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vput(tmpvn);
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return NULL;
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}
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return tmpvn;
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}
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int
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getdisksize(struct vnode *vp, uint64_t *numsecp, unsigned *secsizep)
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{
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struct partinfo dpart;
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struct dkwedge_info dkw;
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struct disk *pdk;
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int error;
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error = VOP_IOCTL(vp, DIOCGPART, &dpart, FREAD, NOCRED);
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if (error == 0) {
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*secsizep = dpart.disklab->d_secsize;
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*numsecp = dpart.part->p_size;
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return 0;
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}
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error = VOP_IOCTL(vp, DIOCGWEDGEINFO, &dkw, FREAD, NOCRED);
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if (error == 0) {
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pdk = disk_find(dkw.dkw_parent);
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if (pdk != NULL) {
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*secsizep = DEV_BSIZE << pdk->dk_blkshift;
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*numsecp = dkw.dkw_size;
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} else
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error = ENODEV;
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}
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return error;
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}
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