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/*
* Copyright (C) 2016 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.
*/
#include <errno.h>
#include <string.h>
#include <android-base/logging.h>
#include <sys/ioctl.h>
#include "fs_mgr_priv.h"
#include "fs_mgr_priv_dm_ioctl.h"
void fs_mgr_verity_ioctl_init(struct dm_ioctl* io, const std::string& name, unsigned flags) {
memset(io, 0, DM_BUF_SIZE);
io->data_size = DM_BUF_SIZE;
io->data_start = sizeof(struct dm_ioctl);
io->version[0] = 4;
io->version[1] = 0;
io->version[2] = 0;
io->flags = flags | DM_READONLY_FLAG;
if (!name.empty()) {
strlcpy(io->name, name.c_str(), sizeof(io->name));
}
}
bool fs_mgr_create_verity_device(struct dm_ioctl* io, const std::string& name, int fd) {
fs_mgr_verity_ioctl_init(io, name, 1);
if (ioctl(fd, DM_DEV_CREATE, io)) {
PERROR << "Error creating device mapping";
return false;
}
return true;
}
bool fs_mgr_destroy_verity_device(struct dm_ioctl* io, const std::string& name, int fd) {
fs_mgr_verity_ioctl_init(io, name, 0);
if (ioctl(fd, DM_DEV_REMOVE, io)) {
PERROR << "Error removing device mapping";
return false;
}
return true;
}
bool fs_mgr_get_verity_device_name(struct dm_ioctl* io, const std::string& name, int fd,
std::string* out_dev_name) {
FS_MGR_CHECK(out_dev_name != nullptr);
fs_mgr_verity_ioctl_init(io, name, 0);
if (ioctl(fd, DM_DEV_STATUS, io)) {
PERROR << "Error fetching verity device number";
return false;
}
int dev_num = (io->dev & 0xff) | ((io->dev >> 12) & 0xfff00);
*out_dev_name = "/dev/block/dm-" + std::to_string(dev_num);
return true;
}
bool fs_mgr_resume_verity_table(struct dm_ioctl* io, const std::string& name, int fd) {
fs_mgr_verity_ioctl_init(io, name, 0);
if (ioctl(fd, DM_DEV_SUSPEND, io)) {
PERROR << "Error activating verity device";
return false;
}
return true;
}
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