1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2002, 2003 Gordon Tetlow 5 * Copyright (c) 2006 Pawel Jakub Dawidek <pjd@FreeBSD.org> 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 33 #include <sys/param.h> 34 #include <sys/systm.h> 35 #include <sys/malloc.h> 36 #include <sys/vnode.h> 37 38 #include <ufs/ufs/dinode.h> 39 #include <ufs/ffs/fs.h> 40 #include <ufs/ufs/quota.h> 41 #include <ufs/ufs/extattr.h> 42 #include <ufs/ffs/ffs_extern.h> 43 44 #include <geom/geom.h> 45 #include <geom/label/g_label.h> 46 47 #define G_LABEL_UFS_VOLUME_DIR "ufs" 48 #define G_LABEL_UFS_ID_DIR "ufsid" 49 50 #define G_LABEL_UFS_VOLUME 0 51 #define G_LABEL_UFS_ID 1 52 53 /* 54 * G_LABEL_UFS_CMP returns true if difference between provider mediasize 55 * and filesystem size is less than G_LABEL_UFS_MAXDIFF sectors 56 */ 57 #define G_LABEL_UFS_CMP(prov, fsys, size) \ 58 ( abs( ((fsys)->size) - ( (prov)->mediasize / (fsys)->fs_fsize )) \ 59 < G_LABEL_UFS_MAXDIFF ) 60 #define G_LABEL_UFS_MAXDIFF 0x100 61 62 /* 63 * Try to find a superblock on the provider. If successful, then 64 * check that the size in the superblock corresponds to the size 65 * of the underlying provider. Finally, look for a volume label 66 * and create an appropriate provider based on that. 67 */ 68 static void 69 g_label_ufs_taste_common(struct g_consumer *cp, char *label, size_t size, int what) 70 { 71 struct g_provider *pp; 72 struct fs *fs; 73 74 g_topology_assert_not(); 75 pp = cp->provider; 76 label[0] = '\0'; 77 78 fs = NULL; 79 if (SBLOCKSIZE % pp->sectorsize != 0 || 80 ffs_sbget(cp, &fs, STDSB, M_GEOM, g_use_g_read_data) != 0) { 81 KASSERT(fs == NULL, 82 ("g_label_ufs_taste_common: non-NULL fs %p\n", fs)); 83 return; 84 } 85 86 /* 87 * Check for magic. We also need to check if file system size 88 * is almost equal to providers size, because sysinstall(8) 89 * used to bogusly put first partition at offset 0 90 * instead of 16, and glabel/ufs would find file system on slice 91 * instead of partition. 92 * 93 * In addition, media size can be a bit bigger than file system 94 * size. For instance, mkuzip can append bytes to align data 95 * to large sector size (it improves compression rates). 96 */ 97 if (fs->fs_magic == FS_UFS1_MAGIC && fs->fs_fsize > 0 && 98 ( G_LABEL_UFS_CMP(pp, fs, fs_old_size) 99 || G_LABEL_UFS_CMP(pp, fs, fs_providersize))) { 100 /* Valid UFS1. */ 101 } else if (fs->fs_magic == FS_UFS2_MAGIC && fs->fs_fsize > 0 && 102 ( G_LABEL_UFS_CMP(pp, fs, fs_size) 103 || G_LABEL_UFS_CMP(pp, fs, fs_providersize))) { 104 /* Valid UFS2. */ 105 } else { 106 goto out; 107 } 108 G_LABEL_DEBUG(1, "%s file system detected on %s.", 109 fs->fs_magic == FS_UFS1_MAGIC ? "UFS1" : "UFS2", pp->name); 110 switch (what) { 111 case G_LABEL_UFS_VOLUME: 112 /* Check for volume label */ 113 if (fs->fs_volname[0] != '\0') 114 strlcpy(label, fs->fs_volname, size); 115 break; 116 case G_LABEL_UFS_ID: 117 if (fs->fs_id[0] != 0 || fs->fs_id[1] != 0) 118 snprintf(label, size, "%08x%08x", fs->fs_id[0], 119 fs->fs_id[1]); 120 break; 121 } 122 out: 123 g_free(fs->fs_csp); 124 g_free(fs); 125 } 126 127 static void 128 g_label_ufs_volume_taste(struct g_consumer *cp, char *label, size_t size) 129 { 130 131 g_label_ufs_taste_common(cp, label, size, G_LABEL_UFS_VOLUME); 132 } 133 134 static void 135 g_label_ufs_id_taste(struct g_consumer *cp, char *label, size_t size) 136 { 137 138 g_label_ufs_taste_common(cp, label, size, G_LABEL_UFS_ID); 139 } 140 141 struct g_label_desc g_label_ufs_volume = { 142 .ld_taste = g_label_ufs_volume_taste, 143 .ld_dir = G_LABEL_UFS_VOLUME_DIR, 144 .ld_enabled = 1 145 }; 146 147 struct g_label_desc g_label_ufs_id = { 148 .ld_taste = g_label_ufs_id_taste, 149 .ld_dir = G_LABEL_UFS_ID_DIR, 150 .ld_enabled = 1 151 }; 152 153 G_LABEL_INIT(ufsid, g_label_ufs_id, "Create device nodes for UFS file system IDs"); 154 G_LABEL_INIT(ufs, g_label_ufs_volume, "Create device nodes for UFS volume names"); 155 156 MODULE_DEPEND(g_label, ufs, 1, 1, 1); 157