blob: 6ad5d16f1c755268c531771acc0d8c10bddaee91 [file] [log] [blame]
/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define LOG_TAG "Vold"
#include "sehandle.h"
#include "Utils.h"
#include "Process.h"
#include <cutils/fs.h>
#include <cutils/log.h>
#include <private/android_filesystem_config.h>
#include <fcntl.h>
#include <linux/fs.h>
#include <stdlib.h>
#include <sys/mount.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#ifndef UMOUNT_NOFOLLOW
#define UMOUNT_NOFOLLOW 0x00000008 /* Don't follow symlink on umount */
#endif
namespace android {
namespace vold {
status_t CreateDeviceNode(const std::string& path, dev_t dev) {
const char* cpath = path.c_str();
status_t res = 0;
char* secontext = nullptr;
if (sehandle) {
if (!selabel_lookup(sehandle, &secontext, cpath, S_IFBLK)) {
setfscreatecon(secontext);
}
}
mode_t mode = 0660 | S_IFBLK;
if (mknod(cpath, mode, dev) < 0) {
if (errno != EEXIST) {
ALOGW("Failed to create device node for %ud:%ud at %s: %s",
major(dev), minor(dev), cpath, strerror(errno));
res = -errno;
}
}
if (secontext) {
setfscreatecon(nullptr);
freecon(secontext);
}
return res;
}
status_t DestroyDeviceNode(const std::string& path) {
const char* cpath = path.c_str();
if (TEMP_FAILURE_RETRY(unlink(cpath))) {
return -errno;
} else {
return OK;
}
}
status_t ForceUnmount(const std::string& path) {
const char* cpath = path.c_str();
if (!umount2(cpath, UMOUNT_NOFOLLOW) || errno == EINVAL || errno == ENOENT) {
return OK;
}
ALOGW("Failed to unmount %s (%s), sending SIGTERM", cpath, strerror(errno));
Process::killProcessesWithOpenFiles(cpath, SIGTERM);
sleep(1);
if (!umount2(cpath, UMOUNT_NOFOLLOW) || errno == EINVAL || errno == ENOENT) {
return OK;
}
ALOGW("Failed to unmount %s (%s), sending SIGKILL", cpath, strerror(errno));
Process::killProcessesWithOpenFiles(cpath, SIGKILL);
sleep(1);
if (!umount2(cpath, UMOUNT_NOFOLLOW) || errno == EINVAL || errno == ENOENT) {
return OK;
}
ALOGW("Failed to unmount %s (%s)", cpath, strerror(errno));
return -errno;
}
} // namespace vold
} // namespace android