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, -1, 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);
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