| 1 | /* $NetBSD: subr_disk_open.c,v 1.13 2015/12/08 20:36:15 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 1.13 2015/12/08 20:36:15 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(device_t dv) |
| 44 | { |
| 45 | devmajor_t bmajor; |
| 46 | int unit; |
| 47 | struct vnode *tmpvn; |
| 48 | int error; |
| 49 | dev_t dev; |
| 50 | |
| 51 | /* |
| 52 | * Lookup major number for disk block device. |
| 53 | */ |
| 54 | bmajor = devsw_name2blk(device_xname(dv), NULL, 0); |
| 55 | if (bmajor == -1) |
| 56 | return NULL; |
| 57 | |
| 58 | unit = device_unit(dv); |
| 59 | /* |
| 60 | * Fake a temporary vnode for the disk, open it, and read |
| 61 | * and hash the sectors. |
| 62 | */ |
| 63 | dev = device_is_a(dv, "dk" ) ? makedev(bmajor, unit) : |
| 64 | MAKEDISKDEV(bmajor, unit, RAW_PART); |
| 65 | if (bdevvp(dev, &tmpvn)) |
| 66 | panic("%s: can't alloc vnode for %s" , __func__, |
| 67 | device_xname(dv)); |
| 68 | error = VOP_OPEN(tmpvn, FREAD | FSILENT, NOCRED); |
| 69 | if (error) { |
| 70 | /* |
| 71 | * Ignore errors caused by missing device, partition, |
| 72 | * medium, or busy [presumably because of a wedge covering it] |
| 73 | */ |
| 74 | switch (error) { |
| 75 | case ENXIO: |
| 76 | case ENODEV: |
| 77 | case EBUSY: |
| 78 | break; |
| 79 | default: |
| 80 | printf("%s: can't open dev %s (%d)\n" , |
| 81 | __func__, device_xname(dv), error); |
| 82 | break; |
| 83 | } |
| 84 | vput(tmpvn); |
| 85 | return NULL; |
| 86 | } |
| 87 | |
| 88 | return tmpvn; |
| 89 | } |
| 90 | |
| 91 | int |
| 92 | getdisksize(struct vnode *vp, uint64_t *numsecp, unsigned int *secsizep) |
| 93 | { |
| 94 | struct partinfo pi; |
| 95 | struct dkwedge_info dkw; |
| 96 | struct disk *pdk; |
| 97 | unsigned int secsize; |
| 98 | uint64_t numsec; |
| 99 | int error; |
| 100 | |
| 101 | /* |
| 102 | * We attempt to get the wedge information first if it exists, |
| 103 | * because the label does not support larger size disks. |
| 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 | secsize = DEV_BSIZE << pdk->dk_blkshift; |
| 110 | numsec = dkw.dkw_size; |
| 111 | } else |
| 112 | error = ENODEV; |
| 113 | } |
| 114 | |
| 115 | if (error) { |
| 116 | error = VOP_IOCTL(vp, DIOCGPARTINFO, &pi, FREAD, NOCRED); |
| 117 | if (error == 0) { |
| 118 | secsize = pi.pi_secsize; |
| 119 | numsec = pi.pi_size; |
| 120 | } |
| 121 | } |
| 122 | |
| 123 | if (error == 0 && |
| 124 | (secsize == 0 || secsize > MAXBSIZE || !powerof2(secsize) || |
| 125 | numsec == 0)) { |
| 126 | #ifdef DIAGNOSTIC |
| 127 | printf("%s: %s returns invalid disksize values" |
| 128 | " (secsize = %u, numsec = %" PRIu64 ")\n" , |
| 129 | __func__, |
| 130 | devsw_blk2name(major(vp->v_specnode->sn_rdev)), |
| 131 | secsize, numsec); |
| 132 | #endif |
| 133 | error = EINVAL; |
| 134 | } |
| 135 | if (error == 0) { |
| 136 | *secsizep = secsize; |
| 137 | *numsecp = numsec; |
| 138 | } |
| 139 | |
| 140 | return error; |
| 141 | } |
| 142 | |
| 143 | int |
| 144 | getdiskinfo(struct vnode *vp, struct dkwedge_info *dkw) |
| 145 | { |
| 146 | struct partinfo pi; |
| 147 | int error; |
| 148 | dev_t dev = vp->v_specnode->sn_rdev; |
| 149 | |
| 150 | if (VOP_IOCTL(vp, DIOCGWEDGEINFO, dkw, FREAD, NOCRED) == 0) |
| 151 | return 0; |
| 152 | |
| 153 | if ((error = VOP_IOCTL(vp, DIOCGPARTINFO, &pi, FREAD, NOCRED)) != 0) |
| 154 | return error; |
| 155 | |
| 156 | snprintf(dkw->dkw_devname, sizeof(dkw->dkw_devname), "%s%" PRId32 "%c" , |
| 157 | devsw_blk2name(major(dev)), DISKUNIT(dev), (char)DISKPART(dev) + |
| 158 | 'a'); |
| 159 | |
| 160 | dkw->dkw_wname[0] = '\0'; |
| 161 | |
| 162 | strlcpy(dkw->dkw_parent, dkw->dkw_devname, sizeof(dkw->dkw_parent)); |
| 163 | |
| 164 | dkw->dkw_size = pi.pi_size; |
| 165 | dkw->dkw_offset = pi.pi_offset; |
| 166 | strlcpy(dkw->dkw_ptype, getfstypename(pi.pi_fstype), |
| 167 | sizeof(dkw->dkw_ptype)); |
| 168 | |
| 169 | return 0; |
| 170 | } |
| 171 | |