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/disklabel.h>
36 #include <sys/malloc.h>
37 #include <sys/vnode.h>
38
39 #include <ufs/ufs/dinode.h>
40 #include <ufs/ffs/fs.h>
41 #include <ufs/ufs/quota.h>
42 #include <ufs/ufs/extattr.h>
43 #include <ufs/ffs/ffs_extern.h>
44
45 #include <geom/geom.h>
46 #include <geom/geom_dbg.h>
47 #include <geom/label/g_label.h>
48
49 #define G_LABEL_UFS_VOLUME 0
50 #define G_LABEL_UFS_ID 1
51
52 /*
53 * G_LABEL_UFS_CMP returns true if difference between provider mediasize
54 * and filesystem size is less than G_LABEL_UFS_MAXDIFF sectors
55 */
56 #define G_LABEL_UFS_CMP(prov, fsys, size) \
57 ( abs( ((fsys)->size) - ( (prov)->mediasize / (fsys)->fs_fsize )) \
58 < G_LABEL_UFS_MAXDIFF )
59 #define G_LABEL_UFS_MAXDIFF 0x100
60
61 /*
62 * For providers that look like disklabels we need to check if the file system
63 * size is almost equal to the provider's size, because sysinstall(8) used to
64 * bogusly put the first partition at offset 0 instead of 16, and glabel/ufs
65 * would find a file system on the slice instead of the partition.
66 *
67 * In addition, media size can be a bit bigger than file system size. For
68 * instance, mkuzip can append bytes to align data to large sector size (it
69 * improves compression rates).
70 */
71 static bool
72 g_label_ufs_ignore_bsdlabel_slice(struct g_consumer *cp,
73 struct fs *fs)
74 {
75 struct g_provider *pp;
76 u_char *buf;
77 uint32_t magic1, magic2;
78 int error;
79
80 pp = cp->provider;
81
82 /*
83 * If the expected provider size for the filesystem matches the
84 * real provider size then don't ignore this filesystem.
85 */
86 if (G_LABEL_UFS_CMP(pp, fs, fs_providersize))
87 return (false);
88
89 /*
90 * If the filesystem size matches the real provider size then
91 * don't ignore this filesystem.
92 */
93 if (fs->fs_magic == FS_UFS1_MAGIC ?
94 G_LABEL_UFS_CMP(pp, fs, fs_old_size) :
95 G_LABEL_UFS_CMP(pp, fs, fs_size))
96 return (false);
97
98 /*
99 * Provider is bigger than expected; probe to see if there's a
100 * disklabel. Adapted from g_part_bsd_probe.
101 */
102
103 /* Check if the superblock overlaps where the disklabel lives. */
104 if (fs->fs_sblockloc < pp->sectorsize * 2)
105 return (false);
106
107 /* Sanity-check the provider. */
108 if (pp->sectorsize < sizeof(struct disklabel) ||
109 pp->mediasize < BBSIZE)
110 return (false);
111 if (BBSIZE % pp->sectorsize)
112 return (false);
113
114 /* Check that there's a disklabel. */
115 buf = g_read_data(cp, pp->sectorsize, pp->sectorsize, &error);
116 if (buf == NULL)
117 return (false);
118 magic1 = le32dec(buf + 0);
119 magic2 = le32dec(buf + 132);
120 g_free(buf);
121 if (magic1 == DISKMAGIC && magic2 == DISKMAGIC)
122 return (true);
123
124 return (false);
125 }
126
127 /*
128 * Try to find a superblock on the provider. If successful, look for a volume
129 * label and create an appropriate provider based on that.
130 */
131 static void
132 g_label_ufs_taste_common(struct g_consumer *cp, char *label, size_t size, int what)
133 {
134 struct g_provider *pp;
135 struct fs *fs;
136
137 g_topology_assert_not();
138 pp = cp->provider;
139 label[0] = '\0';
140
141 fs = NULL;
142 KASSERT(pp->sectorsize != 0, ("Tasting a disk with 0 sectorsize"));
143 if (SBLOCKSIZE % pp->sectorsize != 0 || ffs_sbget(cp, &fs, UFS_STDSB,
144 UFS_NOHASHFAIL | UFS_NOCSUM | UFS_NOMSG, M_GEOM, g_use_g_read_data)
145 != 0) {
146 KASSERT(fs == NULL,
147 ("g_label_ufs_taste_common: non-NULL fs %p\n", fs));
148 return;
149 }
150
151 /* Check for magic. */
152 if (fs->fs_magic == FS_UFS1_MAGIC && fs->fs_fsize > 0) {
153 /* Valid UFS1. */
154 } else if (fs->fs_magic == FS_UFS2_MAGIC && fs->fs_fsize > 0) {
155 /* Valid UFS2. */
156 } else {
157 goto out;
158 }
159 /* Check if this should be ignored for compatibility. */
160 if (g_label_ufs_ignore_bsdlabel_slice(cp, fs))
161 goto out;
162 G_LABEL_DEBUG(1, "%s file system detected on %s.",
163 fs->fs_magic == FS_UFS1_MAGIC ? "UFS1" : "UFS2", pp->name);
164 switch (what) {
165 case G_LABEL_UFS_VOLUME:
166 /* Check for volume label */
167 if (fs->fs_volname[0] != '\0')
168 strlcpy(label, fs->fs_volname, size);
169 break;
170 case G_LABEL_UFS_ID:
171 if (fs->fs_id[0] != 0 || fs->fs_id[1] != 0)
172 snprintf(label, size, "%08x%08x", fs->fs_id[0],
173 fs->fs_id[1]);
174 break;
175 }
176 out:
177 g_free(fs);
178 }
179
180 static void
181 g_label_ufs_volume_taste(struct g_consumer *cp, char *label, size_t size)
182 {
183
184 g_label_ufs_taste_common(cp, label, size, G_LABEL_UFS_VOLUME);
185 }
186
187 static void
188 g_label_ufs_id_taste(struct g_consumer *cp, char *label, size_t size)
189 {
190
191 g_label_ufs_taste_common(cp, label, size, G_LABEL_UFS_ID);
192 }
193
194 struct g_label_desc g_label_ufs_volume = {
195 .ld_taste = g_label_ufs_volume_taste,
196 .ld_dirprefix = "ufs/",
197 .ld_enabled = 1
198 };
199
200 struct g_label_desc g_label_ufs_id = {
201 .ld_taste = g_label_ufs_id_taste,
202 .ld_dirprefix = "ufsid/",
203 .ld_enabled = 1
204 };
205
206 G_LABEL_INIT(ufsid, g_label_ufs_id, "Create device nodes for UFS file system IDs");
207 G_LABEL_INIT(ufs, g_label_ufs_volume, "Create device nodes for UFS volume names");
208
209 MODULE_DEPEND(g_label, ufs, 1, 1, 1);
Cache object: 0e0a73c3a10995ad970f5b752d8f019e
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