103 lines
2.8 KiB
C++
103 lines
2.8 KiB
C++
/*
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* Copyright (C) 2015 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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#define LOG_TAG "Vold"
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#include "sehandle.h"
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#include "Utils.h"
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#include "Process.h"
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#include <cutils/fs.h>
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#include <cutils/log.h>
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#include <private/android_filesystem_config.h>
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#include <fcntl.h>
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#include <linux/fs.h>
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#include <stdlib.h>
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#include <sys/mount.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/wait.h>
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#ifndef UMOUNT_NOFOLLOW
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#define UMOUNT_NOFOLLOW 0x00000008 /* Don't follow symlink on umount */
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#endif
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namespace android {
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namespace vold {
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status_t CreateDeviceNode(const std::string& path, dev_t dev) {
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const char* cpath = path.c_str();
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status_t res = 0;
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char* secontext = nullptr;
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if (sehandle) {
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if (!selabel_lookup(sehandle, &secontext, cpath, S_IFBLK)) {
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setfscreatecon(secontext);
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}
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}
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mode_t mode = 0660 | S_IFBLK;
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if (mknod(cpath, mode, dev) < 0) {
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if (errno != EEXIST) {
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ALOGW("Failed to create device node for %ud:%ud at %s: %s",
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major(dev), minor(dev), cpath, strerror(errno));
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res = -errno;
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}
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}
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if (secontext) {
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setfscreatecon(nullptr);
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freecon(secontext);
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}
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return res;
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}
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status_t DestroyDeviceNode(const std::string& path) {
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const char* cpath = path.c_str();
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if (TEMP_FAILURE_RETRY(unlink(cpath))) {
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return -errno;
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} else {
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return OK;
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}
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}
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status_t ForceUnmount(const std::string& path) {
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const char* cpath = path.c_str();
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if (!umount2(cpath, UMOUNT_NOFOLLOW) || errno == EINVAL || errno == ENOENT) {
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return OK;
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}
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ALOGW("Failed to unmount %s (%s), sending SIGTERM", cpath, strerror(errno));
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Process::killProcessesWithOpenFiles(cpath, SIGTERM);
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sleep(1);
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if (!umount2(cpath, UMOUNT_NOFOLLOW) || errno == EINVAL || errno == ENOENT) {
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return OK;
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}
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ALOGW("Failed to unmount %s (%s), sending SIGKILL", cpath, strerror(errno));
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Process::killProcessesWithOpenFiles(cpath, SIGKILL);
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sleep(1);
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if (!umount2(cpath, UMOUNT_NOFOLLOW) || errno == EINVAL || errno == ENOENT) {
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return OK;
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}
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ALOGW("Failed to unmount %s (%s)", cpath, strerror(errno));
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return -errno;
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}
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} // namespace vold
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} // namespace android
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