1 /* $NetBSD: subr_disk_open.c,v 1.7 2012/04/07 05:38:07 christos 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 1.7 2012/04/07 05:38:07 christos 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 /* 70 * Ignore errors caused by missing device, partition, 71 * medium, or busy [presumably because of a wedge covering it] 72 */ 73 switch (error) { 74 case ENXIO: 75 case ENODEV: 76 case EBUSY: 77 break; 78 default: 79 printf("%s: can't open dev %s (%d)\n", 80 __func__, device_xname(dv), error); 81 break; 82 } 83 vput(tmpvn); 84 return NULL; 85 } 86 87 return tmpvn; 88 } 89 90 int 91 getdisksize(struct vnode *vp, uint64_t *numsecp, unsigned *secsizep) 92 { 93 struct partinfo dpart; 94 struct dkwedge_info dkw; 95 struct disk *pdk; 96 int error; 97 98 error = VOP_IOCTL(vp, DIOCGPART, &dpart, FREAD, NOCRED); 99 if (error == 0) { 100 *secsizep = dpart.disklab->d_secsize; 101 *numsecp = dpart.part->p_size; 102 return 0; 103 } 104 105 error = VOP_IOCTL(vp, DIOCGWEDGEINFO, &dkw, FREAD, NOCRED); 106 if (error == 0) { 107 pdk = disk_find(dkw.dkw_parent); 108 if (pdk != NULL) { 109 *secsizep = DEV_BSIZE << pdk->dk_blkshift; 110 *numsecp = dkw.dkw_size; 111 } else 112 error = ENODEV; 113 } 114 115 return error; 116 } 117 118 int 119 getdiskinfo(struct vnode *vp, struct dkwedge_info *dkw) 120 { 121 struct partinfo dpart; 122 int error; 123 dev_t dev = vp->v_specnode->sn_rdev; 124 125 if (VOP_IOCTL(vp, DIOCGWEDGEINFO, dkw, FREAD, NOCRED) == 0) 126 return 0; 127 128 if ((error = VOP_IOCTL(vp, DIOCGPART, &dpart, FREAD, NOCRED)) != 0) 129 return error; 130 131 snprintf(dkw->dkw_devname, sizeof(dkw->dkw_devname), "%s%" PRId32 "%c", 132 devsw_blk2name(major(dev)), DISKUNIT(dev), (char)DISKPART(dev) + 133 'a'); 134 135 dkw->dkw_wname[0] = '\0'; 136 137 strlcpy(dkw->dkw_parent, dkw->dkw_devname, sizeof(dkw->dkw_parent)); 138 139 dkw->dkw_size = dpart.part->p_size; 140 dkw->dkw_offset = dpart.part->p_offset; 141 142 strlcpy(dkw->dkw_ptype, getfstypename(dpart.part->p_fstype), 143 sizeof(dkw->dkw_ptype)); 144 145 return 0; 146 } 147