1 /*- 2 * Copyright (c) 2002, 2003 Gordon Tetlow 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include <sys/param.h> 31 #include <sys/systm.h> 32 #include <sys/kernel.h> 33 #include <sys/malloc.h> 34 35 #include <ufs/ufs/dinode.h> 36 #include <ufs/ffs/fs.h> 37 38 #include <geom/geom.h> 39 #include <geom/label/g_label.h> 40 41 #define G_LABEL_UFS_DIR "ufs" 42 43 static const int superblocks[] = SBLOCKSEARCH; 44 45 static void 46 g_label_ufs_taste(struct g_consumer *cp, char *label, size_t size) 47 { 48 struct g_provider *pp; 49 int error, sb, superblock; 50 struct fs *fs; 51 52 g_topology_assert_not(); 53 pp = cp->provider; 54 label[0] = '\0'; 55 /* 56 * Walk through the standard places that superblocks hide and look 57 * for UFS magic. If we find magic, then check that the size in the 58 * superblock corresponds to the size of the underlying provider. 59 * Finally, look for a volume label and create an appropriate 60 * provider based on that. 61 */ 62 for (sb = 0; (superblock = superblocks[sb]) != -1; sb++) { 63 /* 64 * Take care not to issue an invalid I/O request. The 65 * offset and size of the superblock candidate must be 66 * multiples of the provider's sector size, otherwise an 67 * FFS can't exist on the provider anyway. 68 */ 69 if (superblock % cp->provider->sectorsize != 0 || 70 SBLOCKSIZE % cp->provider->sectorsize != 0) 71 continue; 72 73 fs = (struct fs *)g_read_data(cp, superblock, SBLOCKSIZE, 74 &error); 75 if (fs == NULL || error != 0) 76 continue; 77 /* Check for magic and make sure things are the right size */ 78 if (fs->fs_magic == FS_UFS1_MAGIC) { 79 G_LABEL_DEBUG(1, "UFS1 file system detected on %s.", 80 pp->name); 81 if (fs->fs_old_size * fs->fs_fsize != 82 (int32_t)pp->mediasize) { 83 g_free(fs); 84 continue; 85 } 86 } else if (fs->fs_magic == FS_UFS2_MAGIC) { 87 G_LABEL_DEBUG(1, "UFS2 file system detected on %s.", 88 pp->name); 89 if (fs->fs_size * fs->fs_fsize != 90 (int64_t)pp->mediasize) { 91 g_free(fs); 92 continue; 93 } 94 } else { 95 g_free(fs); 96 continue; 97 } 98 /* Check for volume label */ 99 if (fs->fs_volname[0] == '\0') { 100 g_free(fs); 101 continue; 102 } 103 strlcpy(label, fs->fs_volname, size); 104 g_free(fs); 105 break; 106 } 107 } 108 109 const struct g_label_desc g_label_ufs = { 110 .ld_taste = g_label_ufs_taste, 111 .ld_dir = G_LABEL_UFS_DIR 112 }; 113