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_DIR "ufs" 43 44 static const int superblocks[] = SBLOCKSEARCH; 45 46 static void 47 g_label_ufs_taste(struct g_consumer *cp, char *label, size_t size) 48 { 49 struct g_provider *pp; 50 int sb, superblock; 51 struct fs *fs; 52 53 g_topology_assert_not(); 54 pp = cp->provider; 55 label[0] = '\0'; 56 57 if (SBLOCKSIZE % cp->provider->sectorsize != 0) 58 return; 59 60 /* 61 * Walk through the standard places that superblocks hide and look 62 * for UFS magic. If we find magic, then check that the size in the 63 * superblock corresponds to the size of the underlying provider. 64 * Finally, look for a volume label and create an appropriate 65 * provider based on that. 66 */ 67 for (sb = 0; (superblock = superblocks[sb]) != -1; sb++) { 68 /* 69 * Take care not to issue an invalid I/O request. The offset of 70 * the superblock candidate must be multiples of the provider's 71 * sector size, otherwise an FFS can't exist on the provider 72 * anyway. 73 */ 74 if (superblock % cp->provider->sectorsize != 0) 75 continue; 76 77 fs = (struct fs *)g_read_data(cp, superblock, SBLOCKSIZE, NULL); 78 if (fs == NULL) 79 continue; 80 /* Check for magic and make sure things are the right size */ 81 if (fs->fs_magic == FS_UFS1_MAGIC && fs->fs_fsize > 0 && 82 pp->mediasize / fs->fs_fsize == fs->fs_old_size) { 83 /* Valid UFS1. */ 84 } else if (fs->fs_magic == FS_UFS2_MAGIC && fs->fs_fsize > 0 && 85 pp->mediasize / fs->fs_fsize == fs->fs_size) { 86 /* Valid UFS2. */ 87 } else { 88 g_free(fs); 89 continue; 90 } 91 if (fs->fs_sblockloc != superblock || fs->fs_ncg < 1 || 92 fs->fs_bsize < MINBSIZE || 93 fs->fs_bsize < sizeof(struct fs)) { 94 g_free(fs); 95 continue; 96 } 97 G_LABEL_DEBUG(1, "%s file system detected on %s.", 98 fs->fs_magic == FS_UFS1_MAGIC ? "UFS1" : "UFS2", pp->name); 99 /* Check for volume label */ 100 if (fs->fs_volname[0] == '\0') { 101 g_free(fs); 102 continue; 103 } 104 strlcpy(label, fs->fs_volname, size); 105 g_free(fs); 106 break; 107 } 108 } 109 110 const struct g_label_desc g_label_ufs = { 111 .ld_taste = g_label_ufs_taste, 112 .ld_dir = G_LABEL_UFS_DIR 113 }; 114