/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <sys/mount.h>
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#include <android-base/logging.h>
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#include <android-base/stringprintf.h>
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#include <logwrap/logwrap.h>
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#include "Exfat.h"
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#include "Utils.h"
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using android::base::StringPrintf;
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namespace android {
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namespace vold {
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namespace exfat {
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static const char* kMkfsPath = "/system/bin/mkfs.exfat";
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static const char* kFsckPath = "/system/bin/fsck.exfat";
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static const char* kMntPath = "/system/bin/mount.exfat";
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bool IsSupported() {
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return access(kMkfsPath, X_OK) == 0 && access(kFsckPath, X_OK) == 0 &&
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(IsFilesystemSupported("exfat") || access(kMntPath, X_OK) == 0);
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}
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status_t Check(const std::string& source) {
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std::vector<std::string> cmd;
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cmd.push_back(kFsckPath);
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cmd.push_back("-a");
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cmd.push_back(source);
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int rc = ForkExecvp(cmd, nullptr, sFsckUntrustedContext);
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if (rc == 0) {
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LOG(INFO) << "Check OK";
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return 0;
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} else {
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LOG(ERROR) << "Check failed (code " << rc << ")";
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errno = EIO;
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return -1;
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}
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}
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status_t Mount(const std::string& source, const std::string& target, int ownerUid, int ownerGid,
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int permMask) {
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int mountFlags = MS_NODEV | MS_NOSUID | MS_DIRSYNC | MS_NOATIME | MS_NOEXEC;
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auto mountData = android::base::StringPrintf("uid=%d,gid=%d,fmask=%o,dmask=%o", ownerUid,
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ownerGid, permMask, permMask);
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if (mount(source.c_str(), target.c_str(), "exfat", mountFlags, mountData.c_str()) == 0) {
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return 0;
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}
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PLOG(ERROR) << "Mount failed; attempting read-only";
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mountFlags |= MS_RDONLY;
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if (IsFilesystemSupported("exfat")) {
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if (mount(source.c_str(), target.c_str(), "exfat", mountFlags, mountData.c_str()) == 0) {
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return 0;
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}
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} else {
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std::vector<std::string> cmd;
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cmd.push_back(kMntPath);
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cmd.push_back("-o");
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cmd.push_back(mountData);
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cmd.push_back(source);
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cmd.push_back(target);
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if (ForkExecvp(cmd) == 0)
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return 0;
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}
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return -1;
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}
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status_t Format(const std::string& source) {
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std::vector<std::string> cmd;
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cmd.push_back(kMkfsPath);
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cmd.push_back("-n");
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cmd.push_back("android");
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cmd.push_back(source);
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int rc = ForkExecvp(cmd);
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if (rc == 0) {
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LOG(INFO) << "Format OK";
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return 0;
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} else {
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LOG(ERROR) << "Format failed (code " << rc << ")";
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errno = EIO;
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return -1;
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}
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return 0;
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}
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} // namespace exfat
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} // namespace vold
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} // namespace android
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