com_android_server_PersistentDataBlockService.cpp revision 963295ea105314e28e4ca9563aa09cb7440de4c3 
1/*
2 * Copyright (C) 2010 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 <android_runtime/AndroidRuntime.h>
18#include <JNIHelp.h>
19#include <jni.h>
20
21#include <utils/misc.h>
22#include <sys/ioctl.h>
23#include <sys/mount.h>
24#include <utils/Log.h>
25
26
27#include <inttypes.h>
28#include <fcntl.h>
29#include <errno.h>
30#include <string.h>
31
32namespace android {
33
34    uint64_t get_block_device_size(int fd)
35    {
36        uint64_t size = 0;
37        int ret;
38
39        ret = ioctl(fd, BLKGETSIZE64, &size);
40
41        if (ret)
42            return 0;
43
44        return size;
45    }
46
47    int wipe_block_device(int fd)
48    {
49        uint64_t range[2];
50        int ret;
51        uint64_t len = get_block_device_size(fd);
52
53        range[0] = 0;
54        range[1] = len;
55
56        if (range[1] == 0)
57            return 0;
58
59        ret = ioctl(fd, BLKSECDISCARD, &range);
60        if (ret < 0) {
61            ALOGE("Something went wrong secure discarding block: %s\n", strerror(errno));
62            range[0] = 0;
63            range[1] = len;
64            ret = ioctl(fd, BLKDISCARD, &range);
65            if (ret < 0) {
66                ALOGE("Discard failed: %s\n", strerror(errno));
67                return -1;
68            } else {
69                ALOGE("Wipe via secure discard failed, used non-secure discard instead\n");
70                return 0;
71            }
72
73        }
74
75        return ret;
76    }
77
78    static jlong com_android_server_PersistentDataBlockService_getBlockDeviceSize(JNIEnv *env, jclass, jstring jpath)
79    {
80        const char *path = env->GetStringUTFChars(jpath, 0);
81        int fd = open(path, O_RDONLY);
82
83        if (fd < 0)
84            return 0;
85
86        return get_block_device_size(fd);
87    }
88
89    static int com_android_server_PersistentDataBlockService_wipe(JNIEnv *env, jclass, jstring jpath) {
90        const char *path = env->GetStringUTFChars(jpath, 0);
91        int fd = open(path, O_WRONLY);
92
93        if (fd < 0)
94            return 0;
95
96        return wipe_block_device(fd);
97    }
98
99    static JNINativeMethod sMethods[] = {
100         /* name, signature, funcPtr */
101        {"nativeGetBlockDeviceSize", "(Ljava/lang/String;)J", (void*)com_android_server_PersistentDataBlockService_getBlockDeviceSize},
102        {"nativeWipe", "(Ljava/lang/String;)I", (void*)com_android_server_PersistentDataBlockService_wipe},
103    };
104
105    int register_android_server_PersistentDataBlockService(JNIEnv* env)
106    {
107        return jniRegisterNativeMethods(env, "com/android/server/PersistentDataBlockService",
108                                        sMethods, NELEM(sMethods));
109    }
110
111} /* namespace android */