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subr_disk_open.c revision 1.1.2.2 
      1 /*	$NetBSD: subr_disk_open.c,v 1.1.2.2 2009/09/16 13:38:01 yamt 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 1.1.2.2 2009/09/16 13:38:01 yamt 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 
     41 struct vnode *
     42 opendisk(struct device *dv)
     43 {
     44 	int bmajor, bminor;
     45 	struct vnode *tmpvn;
     46 	int error;
     47 	dev_t dev;
     48 
     49 	/*
     50 	 * Lookup major number for disk block device.
     51 	 */
     52 	bmajor = devsw_name2blk(device_xname(dv), NULL, 0);
     53 	if (bmajor == -1)
     54 		return NULL;
     55 
     56 	bminor = minor(device_unit(dv));
     57 	/*
     58 	 * Fake a temporary vnode for the disk, open it, and read
     59 	 * and hash the sectors.
     60 	 */
     61 	dev = device_is_a(dv, "dk") ? makedev(bmajor, bminor) :
     62 	    MAKEDISKDEV(bmajor, bminor, RAW_PART);
     63 	if (bdevvp(dev, &tmpvn))
     64 		panic("%s: can't alloc vnode for %s", __func__,
     65 		    device_xname(dv));
     66 	error = VOP_OPEN(tmpvn, FREAD, NOCRED);
     67 	if (error) {
     68 #ifndef DEBUG
     69 		/*
     70 		 * Ignore errors caused by missing device, partition,
     71 		 * or medium.
     72 		 */
     73 		if (error != ENXIO && error != ENODEV)
     74 #endif
     75 			printf("%s: can't open dev %s (%d)\n",
     76 			    __func__, device_xname(dv), error);
     77 		vput(tmpvn);
     78 		return NULL;
     79 	}
     80 
     81 	return tmpvn;
     82 }
     83