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/geom_dbg.h> 46 #include <geom/label/g_label.h> 47 48 #define G_LABEL_UFS_VOLUME 0 49 #define G_LABEL_UFS_ID 1 50 51 /* 52 * G_LABEL_UFS_CMP returns true if difference between provider mediasize 53 * and filesystem size is less than G_LABEL_UFS_MAXDIFF sectors 54 */ 55 #define G_LABEL_UFS_CMP(prov, fsys, size) \ 56 ( abs( ((fsys)->size) - ( (prov)->mediasize / (fsys)->fs_fsize )) \ 57 < G_LABEL_UFS_MAXDIFF ) 58 #define G_LABEL_UFS_MAXDIFF 0x100 59 60 /* 61 * Try to find a superblock on the provider. If successful, then 62 * check that the size in the superblock corresponds to the size 63 * of the underlying provider. Finally, look for a volume label 64 * and create an appropriate provider based on that. 65 */ 66 static void 67 g_label_ufs_taste_common(struct g_consumer *cp, char *label, size_t size, int what) 68 { 69 struct g_provider *pp; 70 struct fs *fs; 71 72 g_topology_assert_not(); 73 pp = cp->provider; 74 label[0] = '\0'; 75 76 fs = NULL; 77 if (SBLOCKSIZE % pp->sectorsize != 0 || ffs_sbget(cp, &fs, 78 STDSB_NOHASHFAIL, M_GEOM, g_use_g_read_data) != 0) { 79 KASSERT(fs == NULL, 80 ("g_label_ufs_taste_common: non-NULL fs %p\n", fs)); 81 return; 82 } 83 84 /* 85 * Check for magic. We also need to check if file system size 86 * is almost equal to providers size, because sysinstall(8) 87 * used to bogusly put first partition at offset 0 88 * instead of 16, and glabel/ufs would find file system on slice 89 * instead of partition. 90 * 91 * In addition, media size can be a bit bigger than file system 92 * size. For instance, mkuzip can append bytes to align data 93 * to large sector size (it improves compression rates). 94 */ 95 if (fs->fs_magic == FS_UFS1_MAGIC && fs->fs_fsize > 0 && 96 ( G_LABEL_UFS_CMP(pp, fs, fs_old_size) 97 || G_LABEL_UFS_CMP(pp, fs, fs_providersize))) { 98 /* Valid UFS1. */ 99 } else if (fs->fs_magic == FS_UFS2_MAGIC && fs->fs_fsize > 0 && 100 ( G_LABEL_UFS_CMP(pp, fs, fs_size) 101 || G_LABEL_UFS_CMP(pp, fs, fs_providersize))) { 102 /* Valid UFS2. */ 103 } else { 104 goto out; 105 } 106 G_LABEL_DEBUG(1, "%s file system detected on %s.", 107 fs->fs_magic == FS_UFS1_MAGIC ? "UFS1" : "UFS2", pp->name); 108 switch (what) { 109 case G_LABEL_UFS_VOLUME: 110 /* Check for volume label */ 111 if (fs->fs_volname[0] != '\0') 112 strlcpy(label, fs->fs_volname, size); 113 break; 114 case G_LABEL_UFS_ID: 115 if (fs->fs_id[0] != 0 || fs->fs_id[1] != 0) 116 snprintf(label, size, "%08x%08x", fs->fs_id[0], 117 fs->fs_id[1]); 118 break; 119 } 120 out: 121 g_free(fs->fs_csp); 122 g_free(fs->fs_si); 123 g_free(fs); 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_dirprefix = "ufs/", 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_dirprefix = "ufsid/", 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"); 154 155 MODULE_DEPEND(g_label, ufs, 1, 1, 1); 156