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3103 jermar 1
/*
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 * Copyright (c) 2008 Jakub Jermar
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 * Copyright (c) 2008 Martin Decky
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup fs
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 * @{
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 */
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/**
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 * @file    tmpfs_dump.c
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 * @brief   Support for loading TMPFS file system dump.
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 */
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#include "tmpfs.h"
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#include "../../vfs/vfs.h"
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#include <ipc/ipc.h>
3250 jermar 42
#include <async.h>
3103 jermar 43
#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <as.h>
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#include <libfs.h>
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#include <ipc/services.h>
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#include <ipc/devmap.h>
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#include <sys/mman.h>
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#include <byteorder.h>
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3251 jermar 54
#define TMPFS_BLOCK_SIZE    1024
3103 jermar 55
 
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struct rdentry {
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    uint8_t type;
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    uint32_t len;
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} __attribute__((packed));
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static bool
3252 jermar 62
tmpfs_restore_recursion(int phone, void *block, off_t *bufpos, size_t *buflen,
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    off_t *pos, tmpfs_dentry_t *parent)
3103 jermar 64
{
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    struct rdentry entry;
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    libfs_ops_t *ops = &tmpfs_libfs_ops;
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    do {
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        char *fname;
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        tmpfs_dentry_t *node;
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        uint32_t size;
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3251 jermar 73
        if (!libfs_blockread(phone, block, bufpos, buflen, pos, &entry,
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            sizeof(entry), TMPFS_BLOCK_SIZE))
3103 jermar 75
            return false;
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        entry.len = uint32_t_le2host(entry.len);
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        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);
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            if (fname == NULL)
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                return false;
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            node = (tmpfs_dentry_t *) ops->create(L_FILE);
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            if (node == NULL) {
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                free(fname);
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                return false;
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            }
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3251 jermar 93
            if (!libfs_blockread(phone, block, bufpos, buflen, pos,
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                fname, entry.len, TMPFS_BLOCK_SIZE)) {
3103 jermar 95
                ops->destroy((void *) node);
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                free(fname);
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                return false;
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            }
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            fname[entry.len] = 0;
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            if (!ops->link((void *) parent, (void *) node, fname)) {
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                ops->destroy((void *) node);
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                free(fname);
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                return false;
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            }
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            free(fname);
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3251 jermar 108
            if (!libfs_blockread(phone, block, bufpos, buflen, pos,
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                &size, sizeof(size), TMPFS_BLOCK_SIZE))
3103 jermar 110
                return false;
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            size = uint32_t_le2host(size);
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            node->data = malloc(size);
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            if (node->data == NULL)
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                return false;
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118
            node->size = size;
3251 jermar 119
            if (!libfs_blockread(phone, block, bufpos, buflen, pos,
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                node->data, size, TMPFS_BLOCK_SIZE))
3103 jermar 121
                return false;
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            break;
3247 jermar 124
        case TMPFS_DIRECTORY:
3103 jermar 125
            fname = malloc(entry.len + 1);
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            if (fname == NULL)
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                return false;
128
 
129
            node = (tmpfs_dentry_t *) ops->create(L_DIRECTORY);
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            if (node == NULL) {
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                free(fname);
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                return false;
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            }
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3251 jermar 135
            if (!libfs_blockread(phone, block, bufpos, buflen, pos,
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                fname, entry.len, TMPFS_BLOCK_SIZE)) {
3103 jermar 137
                ops->destroy((void *) node);
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                free(fname);
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                return false;
140
            }
141
            fname[entry.len] = 0;
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143
            if (!ops->link((void *) parent, (void *) node, fname)) {
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                ops->destroy((void *) node);
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                free(fname);
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                return false;
147
            }
148
            free(fname);
149
 
150
            if (!tmpfs_restore_recursion(phone, block, bufpos,
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                buflen, pos, node))
152
                return false;
153
 
154
            break;
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        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,
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        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,
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        TMPFS_BLOCK_SIZE))
3103 jermar 192
        goto error;
193
 
194
    tag[5] = 0;
195
    if (strcmp(tag, "TMPFS") != 0)
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        goto error;
197
 
198
    if (!tmpfs_restore_recursion(phone, block, &bufpos, &buflen, &pos,
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        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
 */