summaryrefslogtreecommitdiffstats
path: root/sys/geom/geom_vol_ffs.c
blob: de046edd78a058ca750062ade0dea77a2245a32c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
/*-
 * Copyright (c) 2002, 2003 Gordon Tetlow
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include <sys/param.h>
#include <sys/errno.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/bio.h>
#include <sys/lock.h>
#include <sys/mutex.h>

#include <ufs/ufs/dinode.h>
#include <ufs/ffs/fs.h>

#include <geom/geom.h>
#include <geom/geom_slice.h>

#define VOL_FFS_CLASS_NAME "VOL_FFS"

static int superblocks[] = SBLOCKSEARCH;

struct g_vol_ffs_softc {
	char *	vol;
};

static int
g_vol_ffs_start(struct bio *bp __unused)
{
	return(0);
}

static struct g_geom *
g_vol_ffs_taste(struct g_class *mp, struct g_provider *pp, int flags)
{
	struct g_geom *gp;
	struct g_consumer *cp;
	struct g_vol_ffs_softc *ms;
	int error, sb, superblock;
	struct fs *fs;

	g_trace(G_T_TOPOLOGY, "vol_taste(%s,%s)", mp->name, pp->name);
	g_topology_assert();

	/* 
	 * XXX This is a really weak way to make sure we don't recurse.
	 * Probably ought to use BIO_GETATTR to check for this.
	 */
	if (flags == G_TF_NORMAL &&
	    !strcmp(pp->geom->class->name, VOL_FFS_CLASS_NAME))
		return (NULL);

	gp = g_slice_new(mp, 1, pp, &cp, &ms, sizeof(*ms), g_vol_ffs_start);
	if (gp == NULL)
		return (NULL);
	g_topology_unlock();
	/*
	 * Walk through the standard places that superblocks hide and look
	 * for UFS magic. If we find magic, then check that the size in the
	 * superblock corresponds to the size of the underlying provider.
	 * Finally, look for a volume label and create an appropriate 
	 * provider based on that.
	 */
	for (sb=0; (superblock = superblocks[sb]) != -1; sb++) {
		fs = (struct fs *) g_read_data(cp, superblock,
			SBLOCKSIZE, &error);
		if (fs == NULL || error != 0)
			continue;
		/* Check for magic and make sure things are the right size */
		if (fs->fs_magic == FS_UFS1_MAGIC) {
			if (fs->fs_old_size * fs->fs_fsize !=
			    (int32_t) pp->mediasize) {
				g_free(fs);
				continue;
			}
		} else if (fs->fs_magic == FS_UFS2_MAGIC) {
			if (fs->fs_size * fs->fs_fsize !=
			    (int64_t) pp->mediasize) {
				g_free(fs);
				continue;
			}
		} else {
			g_free(fs);
			continue;
		}
		/* Check for volume label */
		if (fs->fs_volname[0] == '\0') {
			g_free(fs);
			continue;
		}
		/* XXX We need to check for namespace conflicts. */
		/* XXX How do you handle a mirror set? */
		/* XXX We don't validate the volume name. */
		g_topology_lock();
		/* Alright, we have a label and a volume name, reconfig. */
		g_slice_config(gp, 0, G_SLICE_CONFIG_SET, (off_t) 0,
		    pp->mediasize, pp->sectorsize, "vol/%s",
		    fs->fs_volname);
		g_free(fs);
		g_topology_unlock();
		break;
	}
	g_topology_lock();
	g_access_rel(cp, -1, 0, 0);
	if (LIST_EMPTY(&gp->provider)) {
		g_slice_spoiled(cp);
		return (NULL);
	}
	return (gp);
}

static struct g_class g_vol_ffs_class	= {
	.name = VOL_FFS_CLASS_NAME,
	.taste = g_vol_ffs_taste,
};

DECLARE_GEOM_CLASS(g_vol_ffs_class, g_vol_ffs);
OpenPOWER on IntegriCloud