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 if (SBLOCKSIZE % pp->sectorsize != 0 || 79 ffs_sbget(cp, &fs, -1, NULL, g_use_g_read_data) != 0) 80 return; 81 /* 82 * Check for magic. We also need to check if file system size 83 * is almost equal to providers size, because sysinstall(8) 84 * used to bogusly put first partition at offset 0 85 * instead of 16, and glabel/ufs would find file system on slice 86 * instead of partition. 87 * 88 * In addition, media size can be a bit bigger than file system 89 * size. For instance, mkuzip can append bytes to align data 90 * to large sector size (it improves compression rates). 91 */ 92 if (fs->fs_magic == FS_UFS1_MAGIC && fs->fs_fsize > 0 && 93 ( G_LABEL_UFS_CMP(pp, fs, fs_old_size) 94 || G_LABEL_UFS_CMP(pp, fs, fs_providersize))) { 95 /* Valid UFS1. */ 96 } else if (fs->fs_magic == FS_UFS2_MAGIC && fs->fs_fsize > 0 && 97 ( G_LABEL_UFS_CMP(pp, fs, fs_size) 98 || G_LABEL_UFS_CMP(pp, fs, fs_providersize))) { 99 /* Valid UFS2. */ 100 } else { 101 g_free(fs); 102 return; 103 } 104 G_LABEL_DEBUG(1, "%s file system detected on %s.", 105 fs->fs_magic == FS_UFS1_MAGIC ? "UFS1" : "UFS2", pp->name); 106 switch (what) { 107 case G_LABEL_UFS_VOLUME: 108 /* Check for volume label */ 109 if (fs->fs_volname[0] != '\0') 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 snprintf(label, size, "%08x%08x", fs->fs_id[0], 115 fs->fs_id[1]); 116 break; 117 } 118 g_free(fs); 119 } 120 121 static void 122 g_label_ufs_volume_taste(struct g_consumer *cp, char *label, size_t size) 123 { 124 125 g_label_ufs_taste_common(cp, label, size, G_LABEL_UFS_VOLUME); 126 } 127 128 static void 129 g_label_ufs_id_taste(struct g_consumer *cp, char *label, size_t size) 130 { 131 132 g_label_ufs_taste_common(cp, label, size, G_LABEL_UFS_ID); 133 } 134 135 struct g_label_desc g_label_ufs_volume = { 136 .ld_taste = g_label_ufs_volume_taste, 137 .ld_dir = G_LABEL_UFS_VOLUME_DIR, 138 .ld_enabled = 1 139 }; 140 141 struct g_label_desc g_label_ufs_id = { 142 .ld_taste = g_label_ufs_id_taste, 143 .ld_dir = G_LABEL_UFS_ID_DIR, 144 .ld_enabled = 1 145 }; 146 147 G_LABEL_INIT(ufsid, g_label_ufs_id, "Create device nodes for UFS file system IDs"); 148 G_LABEL_INIT(ufs, g_label_ufs_volume, "Create device nodes for UFS volume names"); 149