1 /* $NetBSD: subr_disk_open.c,v 1.1 2009/09/06 16:18:56 pooka 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 2009/09/06 16:18:56 pooka 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