Subversion Repositories HelenOS

Rev

Rev 3252 | Rev 4327 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
3103 jermar 1
/*
2
 * Copyright (c) 2008 Jakub Jermar
3
 * Copyright (c) 2008 Martin Decky
4
 * All rights reserved.
5
 *
6
 * Redistribution and use in source and binary forms, with or without
7
 * modification, are permitted provided that the following conditions
8
 * are met:
9
 *
10
 * - Redistributions of source code must retain the above copyright
11
 *   notice, this list of conditions and the following disclaimer.
12
 * - Redistributions in binary form must reproduce the above copyright
13
 *   notice, this list of conditions and the following disclaimer in the
14
 *   documentation and/or other materials provided with the distribution.
15
 * - The name of the author may not be used to endorse or promote products
16
 *   derived from this software without specific prior written permission.
17
 *
18
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28
 */
29
 
30
/** @addtogroup fs
31
 * @{
32
 */
33
 
34
/**
35
 * @file    tmpfs_dump.c
36
 * @brief   Support for loading TMPFS file system dump.
37
 */
38
 
39
#include "tmpfs.h"
40
#include "../../vfs/vfs.h"
41
#include <ipc/ipc.h>
3250 jermar 42
#include <async.h>
3103 jermar 43
#include <errno.h>
44
#include <stdlib.h>
45
#include <string.h>
46
#include <sys/types.h>
47
#include <as.h>
48
#include <libfs.h>
49
#include <ipc/services.h>
50
#include <ipc/devmap.h>
51
#include <sys/mman.h>
52
#include <byteorder.h>
53
 
3251 jermar 54
#define TMPFS_BLOCK_SIZE    1024
3103 jermar 55
 
56
struct rdentry {
57
    uint8_t type;
58
    uint32_t len;
59
} __attribute__((packed));
60
 
61
static bool
3252 jermar 62
tmpfs_restore_recursion(int phone, void *block, off_t *bufpos, size_t *buflen,
63
    off_t *pos, tmpfs_dentry_t *parent)
3103 jermar 64
{
65
    struct rdentry entry;
66
    libfs_ops_t *ops = &tmpfs_libfs_ops;
67
 
68
    do {
69
        char *fname;
70
        tmpfs_dentry_t *node;
71
        uint32_t size;
72
 
3251 jermar 73
        if (!libfs_blockread(phone, block, bufpos, buflen, pos, &entry,
74
            sizeof(entry), TMPFS_BLOCK_SIZE))
3103 jermar 75
            return false;
76
 
77
        entry.len = uint32_t_le2host(entry.len);
78
 
79
        switch (entry.type) {
3247 jermar 80
        case TMPFS_NONE:
3103 jermar 81
            break;
3247 jermar 82
        case TMPFS_FILE:
3103 jermar 83
            fname = malloc(entry.len + 1);
84
            if (fname == NULL)
85
                return false;
86
 
87
            node = (tmpfs_dentry_t *) ops->create(L_FILE);
88
            if (node == NULL) {
89
                free(fname);
90
                return false;
91
            }
92
 
3251 jermar 93
            if (!libfs_blockread(phone, block, bufpos, buflen, pos,
94
                fname, entry.len, TMPFS_BLOCK_SIZE)) {
3103 jermar 95
                ops->destroy((void *) node);
96
                free(fname);
97
                return false;
98
            }
99
            fname[entry.len] = 0;
100
 
101
            if (!ops->link((void *) parent, (void *) node, fname)) {
102
                ops->destroy((void *) node);
103
                free(fname);
104
                return false;
105
            }
106
            free(fname);
107
 
3251 jermar 108
            if (!libfs_blockread(phone, block, bufpos, buflen, pos,
109
                &size, sizeof(size), TMPFS_BLOCK_SIZE))
3103 jermar 110
                return false;
111
 
112
            size = uint32_t_le2host(size);
113
 
114
            node->data = malloc(size);
115
            if (node->data == NULL)
116
                return false;
117
 
118
            node->size = size;
3251 jermar 119
            if (!libfs_blockread(phone, block, bufpos, buflen, pos,
120
                node->data, size, TMPFS_BLOCK_SIZE))
3103 jermar 121
                return false;
122
 
123
            break;
3247 jermar 124
        case TMPFS_DIRECTORY:
3103 jermar 125
            fname = malloc(entry.len + 1);
126
            if (fname == NULL)
127
                return false;
128
 
129
            node = (tmpfs_dentry_t *) ops->create(L_DIRECTORY);
130
            if (node == NULL) {
131
                free(fname);
132
                return false;
133
            }
134
 
3251 jermar 135
            if (!libfs_blockread(phone, block, bufpos, buflen, pos,
136
                fname, entry.len, TMPFS_BLOCK_SIZE)) {
3103 jermar 137
                ops->destroy((void *) node);
138
                free(fname);
139
                return false;
140
            }
141
            fname[entry.len] = 0;
142
 
143
            if (!ops->link((void *) parent, (void *) node, fname)) {
144
                ops->destroy((void *) node);
145
                free(fname);
146
                return false;
147
            }
148
            free(fname);
149
 
150
            if (!tmpfs_restore_recursion(phone, block, bufpos,
151
                buflen, pos, node))
152
                return false;
153
 
154
            break;
155
        default:
156
            return false;
157
        }
3247 jermar 158
    } while (entry.type != TMPFS_NONE);
3103 jermar 159
 
160
    return true;
161
}
162
 
163
bool tmpfs_restore(dev_handle_t dev)
164
{
165
    libfs_ops_t *ops = &tmpfs_libfs_ops;
166
 
3251 jermar 167
    void *block = mmap(NULL, TMPFS_BLOCK_SIZE,
3103 jermar 168
        PROTO_READ | PROTO_WRITE, MAP_ANONYMOUS | MAP_PRIVATE, 0, 0);
169
 
170
    if (block == NULL)
171
        return false;
172
 
173
    int phone = ipc_connect_me_to(PHONE_NS, SERVICE_DEVMAP,
174
        DEVMAP_CONNECT_TO_DEVICE, dev);
175
 
176
    if (phone < 0) {
3251 jermar 177
        munmap(block, TMPFS_BLOCK_SIZE);
3103 jermar 178
        return false;
179
    }
180
 
181
    if (ipc_share_out_start(phone, block, AS_AREA_READ | AS_AREA_WRITE) !=
182
        EOK)
183
        goto error;
184
 
3252 jermar 185
    off_t bufpos = 0;
3103 jermar 186
    size_t buflen = 0;
3252 jermar 187
    off_t pos = 0;
3103 jermar 188
 
189
    char tag[6];
3251 jermar 190
    if (!libfs_blockread(phone, block, &bufpos, &buflen, &pos, tag, 5,
191
        TMPFS_BLOCK_SIZE))
3103 jermar 192
        goto error;
193
 
194
    tag[5] = 0;
195
    if (strcmp(tag, "TMPFS") != 0)
196
        goto error;
197
 
198
    if (!tmpfs_restore_recursion(phone, block, &bufpos, &buflen, &pos,
199
        ops->root_get(dev)))
200
        goto error;
201
 
202
    ipc_hangup(phone);
3251 jermar 203
    munmap(block, TMPFS_BLOCK_SIZE);
3103 jermar 204
    return true;
205
 
206
error:
207
    ipc_hangup(phone);
3251 jermar 208
    munmap(block, TMPFS_BLOCK_SIZE);
3103 jermar 209
    return false;
210
}
211
 
212
/**
213
 * @}
214
 */