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