1 /*
2 * Copyright (C) 2021 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 #define LOG_TAG "F2fsUtils"
18
19 #include "core_jni_helpers.h"
20
21 #include <nativehelper/ScopedUtfChars.h>
22 #include <nativehelper/jni_macros.h>
23
24 #include <sys/ioctl.h>
25 #include <sys/types.h>
26
27 #include <linux/f2fs.h>
28 #include <linux/fs.h>
29
30 #include <android-base/unique_fd.h>
31
32 #include <utils/Log.h>
33
34 #include <errno.h>
35 #include <fcntl.h>
36
37 #include <array>
38
39 using namespace std::literals;
40
41 namespace android {
42
com_android_internal_content_F2fsUtils_nativeReleaseCompressedBlocks(JNIEnv * env,jclass clazz,jstring path)43 static jlong com_android_internal_content_F2fsUtils_nativeReleaseCompressedBlocks(JNIEnv *env,
44 jclass clazz,
45 jstring path) {
46 unsigned long long blkcnt;
47 int ret;
48 ScopedUtfChars filePath(env, path);
49
50 android::base::unique_fd fd(open(filePath.c_str(), O_RDONLY | O_CLOEXEC, 0));
51 if (fd < 0) {
52 ALOGW("Failed to open file: %s (%d)\n", filePath.c_str(), errno);
53 return 0;
54 }
55
56 long flags = 0;
57 ret = ioctl(fd, FS_IOC_GETFLAGS, &flags);
58 if (ret < 0) {
59 ALOGW("Failed to get flags for file: %s (%d)\n", filePath.c_str(), errno);
60 return 0;
61 }
62 if ((flags & FS_COMPR_FL) == 0) {
63 return 0;
64 }
65
66 ret = ioctl(fd, F2FS_IOC_RELEASE_COMPRESS_BLOCKS, &blkcnt);
67 if (ret < 0) {
68 return -errno;
69 }
70 return blkcnt;
71 }
72
73 static const std::array gMethods = {
74 MAKE_JNI_NATIVE_METHOD(
75 "nativeReleaseCompressedBlocks", "(Ljava/lang/String;)J",
76 com_android_internal_content_F2fsUtils_nativeReleaseCompressedBlocks),
77 };
78
register_com_android_internal_content_F2fsUtils(JNIEnv * env)79 int register_com_android_internal_content_F2fsUtils(JNIEnv *env) {
80 return RegisterMethodsOrDie(env, "com/android/internal/content/F2fsUtils", gMethods.data(),
81 gMethods.size());
82 }
83
84 }; // namespace android
85