1 /*-
2 * Copyright (c) 2002, 2003 Gordon Tetlow
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD: src/sys/geom/geom_vol_ffs.c,v 1.16 2005/11/30 22:15:00 sobomax Exp $");
29
30 #include <sys/param.h>
31 #include <sys/errno.h>
32 #include <sys/systm.h>
33 #include <sys/kernel.h>
34 #include <sys/malloc.h>
35 #include <sys/bio.h>
36 #include <sys/lock.h>
37 #include <sys/mutex.h>
38
39 #include <ufs/ufs/dinode.h>
40 #include <ufs/ffs/fs.h>
41
42 #include <geom/geom.h>
43 #include <geom/geom_slice.h>
44
45 #define VOL_FFS_CLASS_NAME "VOL_FFS"
46
47 static int superblocks[] = SBLOCKSEARCH;
48
49 struct g_vol_ffs_softc {
50 char * vol;
51 };
52
53 static int
54 g_vol_ffs_start(struct bio *bp __unused)
55 {
56 return(0);
57 }
58
59 static struct g_geom *
60 g_vol_ffs_taste(struct g_class *mp, struct g_provider *pp, int flags)
61 {
62 struct g_geom *gp;
63 struct g_consumer *cp;
64 struct g_vol_ffs_softc *ms;
65 int sb, superblock;
66 struct fs *fs;
67
68 g_trace(G_T_TOPOLOGY, "vol_taste(%s,%s)", mp->name, pp->name);
69 g_topology_assert();
70
71 /*
72 * XXX This is a really weak way to make sure we don't recurse.
73 * Probably ought to use BIO_GETATTR to check for this.
74 */
75 if (flags == G_TF_NORMAL &&
76 !strcmp(pp->geom->class->name, VOL_FFS_CLASS_NAME))
77 return (NULL);
78
79 gp = g_slice_new(mp, 1, pp, &cp, &ms, sizeof(*ms), g_vol_ffs_start);
80 if (gp == NULL)
81 return (NULL);
82 g_topology_unlock();
83 /*
84 * Walk through the standard places that superblocks hide and look
85 * for UFS magic. If we find magic, then check that the size in the
86 * superblock corresponds to the size of the underlying provider.
87 * Finally, look for a volume label and create an appropriate
88 * provider based on that.
89 */
90 for (sb=0; (superblock = superblocks[sb]) != -1; sb++) {
91 /*
92 * Take care not to issue an invalid I/O request. The
93 * offset and size of the superblock candidate must be
94 * multiples of the provider's sector size, otherwise an
95 * FFS can't exist on the provider anyway.
96 */
97 if (superblock % cp->provider->sectorsize != 0 ||
98 SBLOCKSIZE % cp->provider->sectorsize != 0)
99 continue;
100
101 fs = (struct fs *) g_read_data(cp, superblock,
102 SBLOCKSIZE, NULL);
103 if (fs == NULL)
104 continue;
105 /* Check for magic and make sure things are the right size */
106 if (fs->fs_magic == FS_UFS1_MAGIC) {
107 if (fs->fs_old_size * fs->fs_fsize !=
108 (int32_t) pp->mediasize) {
109 g_free(fs);
110 continue;
111 }
112 } else if (fs->fs_magic == FS_UFS2_MAGIC) {
113 if (fs->fs_size * fs->fs_fsize !=
114 (int64_t) pp->mediasize) {
115 g_free(fs);
116 continue;
117 }
118 } else {
119 g_free(fs);
120 continue;
121 }
122 /* Check for volume label */
123 if (fs->fs_volname[0] == '\0') {
124 g_free(fs);
125 continue;
126 }
127 /* XXX We need to check for namespace conflicts. */
128 /* XXX How do you handle a mirror set? */
129 /* XXX We don't validate the volume name. */
130 g_topology_lock();
131 /* Alright, we have a label and a volume name, reconfig. */
132 g_slice_config(gp, 0, G_SLICE_CONFIG_SET, (off_t) 0,
133 pp->mediasize, pp->sectorsize, "vol/%s",
134 fs->fs_volname);
135 g_free(fs);
136 g_topology_unlock();
137 break;
138 }
139 g_topology_lock();
140 g_access(cp, -1, 0, 0);
141 if (LIST_EMPTY(&gp->provider)) {
142 g_slice_spoiled(cp);
143 return (NULL);
144 }
145 return (gp);
146 }
147
148 static struct g_class g_vol_ffs_class = {
149 .name = VOL_FFS_CLASS_NAME,
150 .version = G_VERSION,
151 .taste = g_vol_ffs_taste,
152 };
153
154 DECLARE_GEOM_CLASS(g_vol_ffs_class, g_vol_ffs);
155
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