Xwarp.cpp revision 2350c44ff39b4cb2940893964a05f778fc80a436 
1/*
2 * Copyright (C) 2008 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include <stdio.h>
18#include <fcntl.h>
19#include <unistd.h>
20#include <errno.h>
21#include <string.h>
22
23#include <sys/types.h>
24#include <sys/stat.h>
25
26#define LOG_TAG "Vold"
27
28#include <cutils/log.h>
29
30#include "Xwarp.h"
31const char *Xwarp::XWARP_BACKINGFILE = "/mnt/secure/asec/xwarp.img";
32const char *Xwarp::XWARP_CFG = "/sys/fs/yaffs/mtd3/xwarp-backing-store";
33const char *Xwarp::XWARP_READY = "/sys/fs/yaffs/mtd3/xwarp-ready";
34const char *Xwarp::XWARP_MIRROR_STATUS = "/sys/fs/yaffs/mtd3/xwarp-mirror";
35
36int Xwarp::enable() {
37    return doEnableDisable(true);
38}
39
40int Xwarp::disable() {
41    return doEnableDisable(false);
42}
43
44int Xwarp::status(bool *ready, unsigned *mirrorPos, unsigned *maxSize) {
45    FILE *fp;
46
47    *ready = false;
48    *mirrorPos = 0;
49    *maxSize = 0;
50    if (!(fp = fopen(XWARP_READY, "r"))) {
51        return -1;
52    }
53
54    fscanf(fp, "%d", (int *) ready);
55    fclose(fp);
56
57    if (!(fp = fopen(XWARP_MIRROR_STATUS, "r"))) {
58        return -1;
59    }
60
61    fscanf(fp, "%u %u", mirrorPos, maxSize);
62    fclose(fp);
63    return 0;
64}
65
66int Xwarp::doEnableDisable(bool enable) {
67    const char *tmp;
68    int fd = open(XWARP_CFG, O_WRONLY);
69
70    if (fd < 0)
71        return -1;
72
73    tmp = (enable ? XWARP_BACKINGFILE : "");
74
75    if (write(fd, tmp, strlen(tmp)+1) < 0) {
76        LOGE("Failed to write xwarp cfg (%s)", strerror(errno));
77        close(fd);
78        return -1;
79    }
80
81    close(fd);
82    return 0;
83}
84