1/*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2002, 2003 Gordon Tetlow 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 AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29#include <sys/cdefs.h> 30__FBSDID("$FreeBSD$"); 31 32#include <sys/param.h> 33#include <sys/errno.h> 34#include <sys/systm.h> 35#include <sys/sysctl.h> 36#include <sys/kernel.h> 37#include <sys/malloc.h> 38#include <sys/bio.h> 39#include <sys/lock.h> 40#include <sys/mutex.h> 41 42#include <ufs/ufs/dinode.h> 43#include <ufs/ffs/fs.h> 44 45#include <geom/geom.h> 46#include <geom/geom_slice.h> 47 48FEATURE(geom_vol, "GEOM support for volume names from UFS superblock"); 49 50#define VOL_FFS_CLASS_NAME "VOL_FFS" 51 52static int superblocks[] = SBLOCKSEARCH; 53static int g_vol_ffs_once; 54 55struct g_vol_ffs_softc { 56 char * vol; 57}; 58 59static int 60g_vol_ffs_start(struct bio *bp __unused) 61{ 62 return(0); 63} 64 65static struct g_geom * 66g_vol_ffs_taste(struct g_class *mp, struct g_provider *pp, int flags) 67{ 68 struct g_geom *gp; 69 struct g_consumer *cp; 70 struct g_vol_ffs_softc *ms; 71 int sb, superblock; 72 struct fs *fs; 73 74 g_trace(G_T_TOPOLOGY, "vol_taste(%s,%s)", mp->name, pp->name); 75 g_topology_assert(); 76 77 /* 78 * XXX This is a really weak way to make sure we don't recurse. 79 * Probably ought to use BIO_GETATTR to check for this. 80 */ 81 if (flags == G_TF_NORMAL && 82 !strcmp(pp->geom->class->name, VOL_FFS_CLASS_NAME)) 83 return (NULL); 84 85 gp = g_slice_new(mp, 1, pp, &cp, &ms, sizeof(*ms), g_vol_ffs_start); 86 if (gp == NULL) 87 return (NULL); 88 g_topology_unlock(); 89 /* 90 * Walk through the standard places that superblocks hide and look 91 * for UFS magic. If we find magic, then check that the size in the 92 * superblock corresponds to the size of the underlying provider. 93 * Finally, look for a volume label and create an appropriate 94 * provider based on that. 95 */ 96 for (sb=0; (superblock = superblocks[sb]) != -1; sb++) { 97 /* 98 * Take care not to issue an invalid I/O request. The 99 * offset and size of the superblock candidate must be 100 * multiples of the provider's sector size, otherwise an 101 * FFS can't exist on the provider anyway. 102 */ 103 if (superblock % cp->provider->sectorsize != 0 || 104 SBLOCKSIZE % cp->provider->sectorsize != 0) 105 continue; 106 107 fs = (struct fs *) g_read_data(cp, superblock, 108 SBLOCKSIZE, NULL); 109 if (fs == NULL) 110 continue; 111 /* Check for magic and make sure things are the right size */ 112 if (fs->fs_magic == FS_UFS1_MAGIC) { 113 if (fs->fs_old_size * fs->fs_fsize != 114 (int32_t) pp->mediasize) { 115 g_free(fs); 116 continue; 117 } 118 } else if (fs->fs_magic == FS_UFS2_MAGIC) { 119 if (fs->fs_size * fs->fs_fsize != 120 (int64_t) pp->mediasize) { 121 g_free(fs); 122 continue; 123 } 124 } else { 125 g_free(fs); 126 continue; 127 } 128 /* Check for volume label */ 129 if (fs->fs_volname[0] == '\0') { 130 g_free(fs); 131 continue; 132 } 133 /* XXX We need to check for namespace conflicts. */ 134 /* XXX How do you handle a mirror set? */ 135 /* XXX We don't validate the volume name. */ 136 g_topology_lock(); 137 /* Alright, we have a label and a volume name, reconfig. */ 138 g_slice_config(gp, 0, G_SLICE_CONFIG_SET, (off_t) 0, 139 pp->mediasize, pp->sectorsize, "vol/%s", 140 fs->fs_volname); 141 g_free(fs); 142 g_topology_unlock(); 143 break; 144 } 145 g_topology_lock(); 146 g_access(cp, -1, 0, 0); 147 if (LIST_EMPTY(&gp->provider)) { 148 g_slice_spoiled(cp); 149 return (NULL); 150 } 151 if (!g_vol_ffs_once) { 152 g_vol_ffs_once = 1; 153 printf( 154 "WARNING: geom_vol_Ffs (geom %s) is deprecated, " 155 "use glabel instead.\n", gp->name); 156 } 157 return (gp); 158} 159 160static struct g_class g_vol_ffs_class = { 161 .name = VOL_FFS_CLASS_NAME, 162 .version = G_VERSION, 163 .taste = g_vol_ffs_taste, 164}; 165 166DECLARE_GEOM_CLASS(g_vol_ffs_class, g_vol_ffs); 167MODULE_VERSION(geom_vol_ffs, 0); 168