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
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
|
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include <sys/types.h>
#include <sys/param.h>
#include <sys/mdesc.h>
#include <sys/mdesc_impl.h>
md_t *
md_init_intern(uint64_t *ptr, void *(*allocp)(size_t),
void (*freep)(void *, size_t))
{
md_impl_t *mdp;
int idx;
int count;
int done;
uint64_t gen;
mde_str_cookie_t root_name;
/*
* Very basic checkup for alignment to avoid
* bus error issues.
*/
if ((((uintptr_t)ptr) & 7) != 0)
return (NULL);
mdp = (md_impl_t *)allocp(sizeof (md_impl_t));
if (mdp == NULL)
return (NULL);
mdp->allocp = allocp;
mdp->freep = freep;
mdp->caddr = (char *)ptr;
/*
* setup internal structures
*/
mdp->headerp = (md_header_t *)mdp->caddr;
if (mdtoh32(mdp->headerp->transport_version) != MD_TRANSPORT_VERSION) {
goto cleanup_nohash;
}
mdp->node_blk_size = mdtoh32(mdp->headerp->node_blk_sz);
mdp->name_blk_size = mdtoh32(mdp->headerp->name_blk_sz);
mdp->data_blk_size = mdtoh32(mdp->headerp->data_blk_sz);
mdp->size = MD_HEADER_SIZE + mdp->node_blk_size +
mdp->name_blk_size + mdp->data_blk_size;
mdp->mdep = (md_element_t *)(mdp->caddr + MD_HEADER_SIZE);
mdp->namep = (char *)(mdp->caddr + MD_HEADER_SIZE + mdp->node_blk_size);
mdp->datap = (uint8_t *)(mdp->caddr + MD_HEADER_SIZE +
mdp->name_blk_size + mdp->node_blk_size);
mdp->root_node = MDE_INVAL_ELEM_COOKIE;
/*
* Should do a lot more sanity checking here.
*/
/*
* Should initialize a name hash here if we intend to use one
*/
/*
* Setup to find the root node
*/
root_name = md_find_name((md_t *)mdp, "root");
if (root_name == MDE_INVAL_STR_COOKIE) {
goto cleanup;
}
/*
* One more property we need is the count of nodes in the
* DAG, not just the number of elements.
*
* We try and pickup the root node along the way here.
*/
for (done = 0, idx = 0, count = 0; !done; ) {
md_element_t *np;
np = &(mdp->mdep[idx]);
switch (MDE_TAG(np)) {
case MDET_LIST_END:
done = 1;
break;
case MDET_NODE:
if (root_name == MDE_NAME(np)) {
if (mdp->root_node != MDE_INVAL_ELEM_COOKIE) {
/* Gah .. more than one root */
goto cleanup;
}
mdp->root_node = (mde_cookie_t)idx;
}
idx = MDE_PROP_INDEX(np);
count++;
break;
default:
idx++; /* ignore */
}
}
/*
* Ensure there is a root node
*/
if (mdp->root_node == MDE_INVAL_ELEM_COOKIE) {
goto cleanup;
}
/*
* Register the counts
*/
mdp->element_count = idx + 1; /* include LIST_END */
mdp->node_count = count;
/*
* Final sanity check that everything adds up
*/
if (mdp->element_count != (mdp->node_blk_size / MD_ELEMENT_SIZE))
goto cleanup;
mdp->md_magic = LIBMD_MAGIC;
/*
* Setup MD generation
*/
if (md_get_prop_val((md_t *)mdp, mdp->root_node,
"md-generation#", &gen) != 0)
mdp->gen = MDESC_INVAL_GEN;
else
mdp->gen = gen;
return ((md_t *)mdp);
cleanup:
/*
* Clean up here - including a name hash if
* we build one.
*/
cleanup_nohash:
mdp->freep(mdp, sizeof (md_impl_t));
return (NULL);
}
|
