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subr_disk_open.c revision 1.1.2.3 
      1  1.1.2.3  yamt /*	$NetBSD: subr_disk_open.c,v 1.1.2.3 2010/03/11 15:04:18 yamt Exp $	*/
      2  1.1.2.2  yamt 
      3  1.1.2.2  yamt /*-
      4  1.1.2.2  yamt  * Copyright (c) 2006 The NetBSD Foundation, Inc.
      5  1.1.2.2  yamt  * All rights reserved.
      6  1.1.2.2  yamt  *
      7  1.1.2.2  yamt  * Redistribution and use in source and binary forms, with or without
      8  1.1.2.2  yamt  * modification, are permitted provided that the following conditions
      9  1.1.2.2  yamt  * are met:
     10  1.1.2.2  yamt  * 1. Redistributions of source code must retain the above copyright
     11  1.1.2.2  yamt  *    notice, this list of conditions and the following disclaimer.
     12  1.1.2.2  yamt  * 2. Redistributions in binary form must reproduce the above copyright
     13  1.1.2.2  yamt  *    notice, this list of conditions and the following disclaimer in the
     14  1.1.2.2  yamt  *    documentation and/or other materials provided with the distribution.
     15  1.1.2.2  yamt  *
     16  1.1.2.2  yamt  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     17  1.1.2.2  yamt  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     18  1.1.2.2  yamt  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     19  1.1.2.2  yamt  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     20  1.1.2.2  yamt  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     21  1.1.2.2  yamt  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     22  1.1.2.2  yamt  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     23  1.1.2.2  yamt  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     24  1.1.2.2  yamt  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     25  1.1.2.2  yamt  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     26  1.1.2.2  yamt  * POSSIBILITY OF SUCH DAMAGE.
     27  1.1.2.2  yamt  */
     28  1.1.2.2  yamt 
     29  1.1.2.2  yamt #include <sys/cdefs.h>
     30  1.1.2.3  yamt __KERNEL_RCSID(0, "$NetBSD: subr_disk_open.c,v 1.1.2.3 2010/03/11 15:04:18 yamt Exp $");
     31  1.1.2.2  yamt 
     32  1.1.2.2  yamt #include <sys/param.h>
     33  1.1.2.2  yamt #include <sys/conf.h>
     34  1.1.2.2  yamt #include <sys/device.h>
     35  1.1.2.2  yamt #include <sys/disk.h>
     36  1.1.2.2  yamt #include <sys/disklabel.h>
     37  1.1.2.2  yamt #include <sys/fcntl.h>
     38  1.1.2.2  yamt #include <sys/kauth.h>
     39  1.1.2.2  yamt #include <sys/vnode.h>
     40  1.1.2.2  yamt 
     41  1.1.2.2  yamt struct vnode *
     42  1.1.2.2  yamt opendisk(struct device *dv)
     43  1.1.2.2  yamt {
     44  1.1.2.2  yamt 	int bmajor, bminor;
     45  1.1.2.2  yamt 	struct vnode *tmpvn;
     46  1.1.2.2  yamt 	int error;
     47  1.1.2.2  yamt 	dev_t dev;
     48  1.1.2.2  yamt 
     49  1.1.2.2  yamt 	/*
     50  1.1.2.2  yamt 	 * Lookup major number for disk block device.
     51  1.1.2.2  yamt 	 */
     52  1.1.2.2  yamt 	bmajor = devsw_name2blk(device_xname(dv), NULL, 0);
     53  1.1.2.2  yamt 	if (bmajor == -1)
     54  1.1.2.2  yamt 		return NULL;
     55  1.1.2.2  yamt 
     56  1.1.2.2  yamt 	bminor = minor(device_unit(dv));
     57  1.1.2.2  yamt 	/*
     58  1.1.2.2  yamt 	 * Fake a temporary vnode for the disk, open it, and read
     59  1.1.2.2  yamt 	 * and hash the sectors.
     60  1.1.2.2  yamt 	 */
     61  1.1.2.2  yamt 	dev = device_is_a(dv, "dk") ? makedev(bmajor, bminor) :
     62  1.1.2.2  yamt 	    MAKEDISKDEV(bmajor, bminor, RAW_PART);
     63  1.1.2.2  yamt 	if (bdevvp(dev, &tmpvn))
     64  1.1.2.2  yamt 		panic("%s: can't alloc vnode for %s", __func__,
     65  1.1.2.2  yamt 		    device_xname(dv));
     66  1.1.2.2  yamt 	error = VOP_OPEN(tmpvn, FREAD, NOCRED);
     67  1.1.2.2  yamt 	if (error) {
     68  1.1.2.2  yamt #ifndef DEBUG
     69  1.1.2.2  yamt 		/*
     70  1.1.2.2  yamt 		 * Ignore errors caused by missing device, partition,
     71  1.1.2.2  yamt 		 * or medium.
     72  1.1.2.2  yamt 		 */
     73  1.1.2.2  yamt 		if (error != ENXIO && error != ENODEV)
     74  1.1.2.2  yamt #endif
     75  1.1.2.2  yamt 			printf("%s: can't open dev %s (%d)\n",
     76  1.1.2.2  yamt 			    __func__, device_xname(dv), error);
     77  1.1.2.2  yamt 		vput(tmpvn);
     78  1.1.2.2  yamt 		return NULL;
     79  1.1.2.2  yamt 	}
     80  1.1.2.2  yamt 
     81  1.1.2.2  yamt 	return tmpvn;
     82  1.1.2.2  yamt }
     83  1.1.2.3  yamt 
     84  1.1.2.3  yamt int
     85  1.1.2.3  yamt getdisksize(struct vnode *vp, uint64_t *numsecp, unsigned *secsizep)
     86  1.1.2.3  yamt {
     87  1.1.2.3  yamt 	struct partinfo dpart;
     88  1.1.2.3  yamt 	struct dkwedge_info dkw;
     89  1.1.2.3  yamt 	struct disk *pdk;
     90  1.1.2.3  yamt 	int error;
     91  1.1.2.3  yamt 
     92  1.1.2.3  yamt 	error = VOP_IOCTL(vp, DIOCGPART, &dpart, FREAD, NOCRED);
     93  1.1.2.3  yamt 	if (error == 0) {
     94  1.1.2.3  yamt 		*secsizep = dpart.disklab->d_secsize;
     95  1.1.2.3  yamt 		*numsecp  = dpart.part->p_size;
     96  1.1.2.3  yamt 		return 0;
     97  1.1.2.3  yamt 	}
     98  1.1.2.3  yamt 
     99  1.1.2.3  yamt 	error = VOP_IOCTL(vp, DIOCGWEDGEINFO, &dkw, FREAD, NOCRED);
    100  1.1.2.3  yamt 	if (error == 0) {
    101  1.1.2.3  yamt 		pdk = disk_find(dkw.dkw_parent);
    102  1.1.2.3  yamt 		if (pdk != NULL) {
    103  1.1.2.3  yamt 			*secsizep = DEV_BSIZE << pdk->dk_blkshift;
    104  1.1.2.3  yamt 			*numsecp  = dkw.dkw_size;
    105  1.1.2.3  yamt 		} else
    106  1.1.2.3  yamt 			error = ENODEV;
    107  1.1.2.3  yamt 	}
    108  1.1.2.3  yamt 
    109  1.1.2.3  yamt 	return error;
    110  1.1.2.3  yamt }
    111