| /* |
| * 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 <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 char *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) { |
| strlcpy(io->name, name, sizeof(io->name)); |
| } |
| } |
| |
| int fs_mgr_create_verity_device(struct dm_ioctl *io, char *name, int fd) |
| { |
| fs_mgr_verity_ioctl_init(io, name, 1); |
| if (ioctl(fd, DM_DEV_CREATE, io)) { |
| ERROR("Error creating device mapping (%s)", strerror(errno)); |
| return -1; |
| } |
| return 0; |
| } |
| |
| int fs_mgr_destroy_verity_device(struct dm_ioctl *io, char *name, int fd) |
| { |
| fs_mgr_verity_ioctl_init(io, name, 0); |
| if (ioctl(fd, DM_DEV_REMOVE, io)) { |
| ERROR("Error removing device mapping (%s)", strerror(errno)); |
| return -1; |
| } |
| return 0; |
| } |
| |
| int fs_mgr_get_verity_device_name(struct dm_ioctl *io, char *name, int fd, char **dev_name) |
| { |
| fs_mgr_verity_ioctl_init(io, name, 0); |
| if (ioctl(fd, DM_DEV_STATUS, io)) { |
| ERROR("Error fetching verity device number (%s)", strerror(errno)); |
| return -1; |
| } |
| int dev_num = (io->dev & 0xff) | ((io->dev >> 12) & 0xfff00); |
| if (asprintf(dev_name, "/dev/block/dm-%u", dev_num) < 0) { |
| ERROR("Error getting verity block device name (%s)", strerror(errno)); |
| return -1; |
| } |
| return 0; |
| } |
| |
| int fs_mgr_resume_verity_table(struct dm_ioctl *io, char *name, int fd) |
| { |
| fs_mgr_verity_ioctl_init(io, name, 0); |
| if (ioctl(fd, DM_DEV_SUSPEND, io)) { |
| ERROR("Error activating verity device (%s)", strerror(errno)); |
| return -1; |
| } |
| return 0; |
| } |
| |