1 /*- 2 * Copyright (c) 2002, 2003 Gordon Tetlow 3 * Copyright (c) 2006 Pawel Jakub Dawidek <pjd@FreeBSD.org> 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 31 #include <sys/param.h> 32 #include <sys/systm.h> 33 #include <sys/kernel.h> 34 #include <sys/malloc.h> 35 36 #include <ufs/ufs/dinode.h> 37 #include <ufs/ffs/fs.h> 38 39 #include <geom/geom.h> 40 #include <geom/label/g_label.h> 41 42 #define G_LABEL_UFS_VOLUME_DIR "ufs" 43 #define G_LABEL_UFS_ID_DIR "ufsid" 44 45 #define G_LABEL_UFS_VOLUME 0 46 #define G_LABEL_UFS_ID 1 47 48 static const int superblocks[] = SBLOCKSEARCH; 49 50 static void 51 g_label_ufs_taste_common(struct g_consumer *cp, char *label, size_t size, int what) 52 { 53 struct g_provider *pp; 54 int sb, superblock; 55 struct fs *fs; 56 57 g_topology_assert_not(); 58 pp = cp->provider; 59 label[0] = '\0'; 60 61 if (SBLOCKSIZE % cp->provider->sectorsize != 0) 62 return; 63 64 /* 65 * Walk through the standard places that superblocks hide and look 66 * for UFS magic. If we find magic, then check that the size in the 67 * superblock corresponds to the size of the underlying provider. 68 * Finally, look for a volume label and create an appropriate 69 * provider based on that. 70 */ 71 for (sb = 0; (superblock = superblocks[sb]) != -1; sb++) { 72 /* 73 * Take care not to issue an invalid I/O request. The offset of 74 * the superblock candidate must be multiples of the provider's 75 * sector size, otherwise an FFS can't exist on the provider 76 * anyway. 77 */ 78 if (superblock % cp->provider->sectorsize != 0) 79 continue; 80 81 fs = (struct fs *)g_read_data(cp, superblock, SBLOCKSIZE, NULL); 82 if (fs == NULL) 83 continue; 84 /* Check for magic and make sure things are the right size */ 85 if (fs->fs_magic == FS_UFS1_MAGIC && fs->fs_fsize > 0 && 86 pp->mediasize / fs->fs_fsize == fs->fs_old_size) { 87 /* Valid UFS1. */ 88 } else if (fs->fs_magic == FS_UFS2_MAGIC && fs->fs_fsize > 0 && 89 pp->mediasize / fs->fs_fsize == fs->fs_size) { 90 /* Valid UFS2. */ 91 } else { 92 g_free(fs); 93 continue; 94 } 95 if (fs->fs_sblockloc != superblock || fs->fs_ncg < 1 || 96 fs->fs_bsize < MINBSIZE || 97 fs->fs_bsize < sizeof(struct fs)) { 98 g_free(fs); 99 continue; 100 } 101 G_LABEL_DEBUG(1, "%s file system detected on %s.", 102 fs->fs_magic == FS_UFS1_MAGIC ? "UFS1" : "UFS2", pp->name); 103 switch (what) { 104 case G_LABEL_UFS_VOLUME: 105 /* Check for volume label */ 106 if (fs->fs_volname[0] == '\0') { 107 g_free(fs); 108 continue; 109 } 110 strlcpy(label, fs->fs_volname, size); 111 break; 112 case G_LABEL_UFS_ID: 113 if (fs->fs_id[0] == 0 && fs->fs_id[1] == 0) { 114 g_free(fs); 115 continue; 116 } 117 snprintf(label, size, "%08x%08x", fs->fs_id[0], 118 fs->fs_id[1]); 119 break; 120 } 121 g_free(fs); 122 break; 123 } 124 } 125 126 static void 127 g_label_ufs_volume_taste(struct g_consumer *cp, char *label, size_t size) 128 { 129 130 g_label_ufs_taste_common(cp, label, size, G_LABEL_UFS_VOLUME); 131 } 132 133 static void 134 g_label_ufs_id_taste(struct g_consumer *cp, char *label, size_t size) 135 { 136 137 g_label_ufs_taste_common(cp, label, size, G_LABEL_UFS_ID); 138 } 139 140 struct g_label_desc g_label_ufs_volume = { 141 .ld_taste = g_label_ufs_volume_taste, 142 .ld_dir = G_LABEL_UFS_VOLUME_DIR, 143 .ld_enabled = 1 144 }; 145 146 struct g_label_desc g_label_ufs_id = { 147 .ld_taste = g_label_ufs_id_taste, 148 .ld_dir = G_LABEL_UFS_ID_DIR, 149 .ld_enabled = 1 150 }; 151 152 G_LABEL_INIT(ufsid, g_label_ufs_id, "Create device nodes for UFS file system IDs"); 153 G_LABEL_INIT(ufs, g_label_ufs_volume, "Create device nodes for UFS volume names"); 154