upload android base code part3
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369
android/bootable/recovery/roots.cpp
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369
android/bootable/recovery/roots.cpp
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/*
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* Copyright (C) 2007 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 "roots.h"
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#include <errno.h>
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#include <stdlib.h>
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#include <sys/mount.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#include <ctype.h>
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#include <fcntl.h>
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#include <android-base/logging.h>
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#include <android-base/properties.h>
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#include <android-base/stringprintf.h>
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#include <android-base/unique_fd.h>
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#include <ext4_utils/wipe.h>
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#include <fs_mgr.h>
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#include "common.h"
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#include "mounts.h"
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#include "cryptfs.h"
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static struct fstab *fstab = NULL;
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extern struct selabel_handle *sehandle;
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void load_volume_table()
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{
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int i;
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int ret;
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fstab = fs_mgr_read_fstab_default();
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if (!fstab) {
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LOG(ERROR) << "failed to read default fstab";
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return;
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}
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ret = fs_mgr_add_entry(fstab, "/tmp", "ramdisk", "ramdisk");
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if (ret < 0 ) {
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LOG(ERROR) << "failed to add /tmp entry to fstab";
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fs_mgr_free_fstab(fstab);
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fstab = NULL;
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return;
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}
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printf("recovery filesystem table\n");
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printf("=========================\n");
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for (i = 0; i < fstab->num_entries; ++i) {
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Volume* v = &fstab->recs[i];
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printf(" %d %s %s %s %lld\n", i, v->mount_point, v->fs_type,
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v->blk_device, v->length);
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}
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printf("\n");
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}
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Volume* volume_for_path(const char* path) {
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return fs_mgr_get_entry_for_mount_point(fstab, path);
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}
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// Mount the volume specified by path at the given mount_point.
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int ensure_path_mounted_at(const char* path, const char* mount_point) {
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Volume* v = volume_for_path(path);
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if (v == NULL) {
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LOG(ERROR) << "unknown volume for path [" << path << "]";
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return -1;
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}
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if (strcmp(v->fs_type, "ramdisk") == 0) {
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// the ramdisk is always mounted.
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return 0;
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}
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if (!scan_mounted_volumes()) {
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LOG(ERROR) << "failed to scan mounted volumes";
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return -1;
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}
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if (!mount_point) {
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mount_point = v->mount_point;
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}
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MountedVolume* mv = find_mounted_volume_by_mount_point(mount_point);
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if (mv) {
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// volume is already mounted
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return 0;
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}
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mkdir(mount_point, 0755); // in case it doesn't already exist
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if (strcmp(v->fs_type, "ext4") == 0 ||
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strcmp(v->fs_type, "squashfs") == 0 ||
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strcmp(v->fs_type, "vfat") == 0) {
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int result = mount(v->blk_device, mount_point, v->fs_type, v->flags, v->fs_options);
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if (result == -1 && fs_mgr_is_formattable(v)) {
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LOG(ERROR) << "failed to mount " << mount_point << " (" << strerror(errno)
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<< ") , formatting.....";
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bool crypt_footer = fs_mgr_is_encryptable(v) && !strcmp(v->key_loc, "footer");
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if (fs_mgr_do_format(v, crypt_footer) == 0) {
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result = mount(v->blk_device, mount_point, v->fs_type, v->flags, v->fs_options);
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} else {
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PLOG(ERROR) << "failed to format " << mount_point;
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return -1;
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}
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}
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if (result == -1) {
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PLOG(ERROR) << "failed to mount " << mount_point;
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return -1;
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}
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return 0;
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} else if (strcmp(v->fs_type, "auto") == 0) {
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int i;
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Volume* tmp = NULL;
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for (i = 0; i < fstab->num_entries; i++) {
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if (strcmp(mount_point, fstab->recs[i].mount_point) == 0) {
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tmp = &fstab->recs[i];
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int result = mount(tmp->blk_device, tmp->mount_point, "vfat",
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tmp->flags, tmp->fs_options);
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if (result != 0)
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result = mount(tmp->blk_device, tmp->mount_point, "ntfs",
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tmp->flags, tmp->fs_options);
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if (result == 0) return 0;
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}
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}
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LOG(ERROR) << "failed to mount " << v->mount_point << " (" << strerror(errno) << ")";
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return -1;
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}
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LOG(ERROR) << "unknown fs_type \"" << v->fs_type << "\" for " << mount_point;
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return -1;
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}
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int ensure_path_mounted(const char* path) {
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// Mount at the default mount point.
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return ensure_path_mounted_at(path, nullptr);
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}
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int ensure_path_unmounted(const char* path) {
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Volume* v = volume_for_path(path);
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if (v == NULL) {
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LOG(ERROR) << "unknown volume for path [" << path << "]";
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return -1;
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}
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if (strcmp(v->fs_type, "ramdisk") == 0) {
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// the ramdisk is always mounted; you can't unmount it.
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return -1;
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}
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if (!scan_mounted_volumes()) {
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LOG(ERROR) << "failed to scan mounted volumes";
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return -1;
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}
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MountedVolume* mv = find_mounted_volume_by_mount_point(v->mount_point);
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if (mv == NULL) {
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// volume is already unmounted
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return 0;
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}
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return unmount_mounted_volume(mv);
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}
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static int exec_cmd(const char* path, char* const argv[]) {
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int status;
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pid_t child;
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if ((child = vfork()) == 0) {
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execv(path, argv);
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_exit(EXIT_FAILURE);
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}
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waitpid(child, &status, 0);
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if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
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LOG(ERROR) << path << " failed with status " << WEXITSTATUS(status);
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}
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return WEXITSTATUS(status);
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}
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static ssize_t get_file_size(int fd, uint64_t reserve_len) {
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struct stat buf;
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int ret = fstat(fd, &buf);
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if (ret) return 0;
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ssize_t computed_size;
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if (S_ISREG(buf.st_mode)) {
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computed_size = buf.st_size - reserve_len;
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} else if (S_ISBLK(buf.st_mode)) {
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computed_size = get_block_device_size(fd) - reserve_len;
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} else {
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computed_size = 0;
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}
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return computed_size;
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}
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int format_volume(const char* volume, const char* directory) {
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Volume* v = volume_for_path(volume);
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if (v == NULL) {
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LOG(ERROR) << "unknown volume \"" << volume << "\"";
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return -1;
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}
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if (strcmp(v->fs_type, "ramdisk") == 0) {
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// you can't format the ramdisk.
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LOG(ERROR) << "can't format_volume \"" << volume << "\"";
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return -1;
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}
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if (strcmp(v->mount_point, volume) != 0) {
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LOG(ERROR) << "can't give path \"" << volume << "\" to format_volume";
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return -1;
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}
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if (ensure_path_unmounted(volume) != 0) {
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LOG(ERROR) << "format_volume failed to unmount \"" << v->mount_point << "\"";
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return -1;
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}
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if (strcmp(v->fs_type, "ext4") == 0 || strcmp(v->fs_type, "f2fs") == 0) {
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// if there's a key_loc that looks like a path, it should be a
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// block device for storing encryption metadata. wipe it too.
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if (v->key_loc != NULL && v->key_loc[0] == '/') {
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LOG(INFO) << "wiping " << v->key_loc;
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int fd = open(v->key_loc, O_WRONLY | O_CREAT, 0644);
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if (fd < 0) {
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LOG(ERROR) << "format_volume: failed to open " << v->key_loc;
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return -1;
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}
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wipe_block_device(fd, get_file_size(fd));
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close(fd);
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}
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ssize_t length = 0;
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if (v->length != 0) {
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length = v->length;
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} else if (v->key_loc != NULL && strcmp(v->key_loc, "footer") == 0) {
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android::base::unique_fd fd(open(v->blk_device, O_RDONLY));
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if (fd < 0) {
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PLOG(ERROR) << "get_file_size: failed to open " << v->blk_device;
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return -1;
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}
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length = get_file_size(fd.get(), CRYPT_FOOTER_OFFSET);
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if (length <= 0) {
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LOG(ERROR) << "get_file_size: invalid size " << length << " for " << v->blk_device;
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return -1;
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}
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}
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int result;
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if (strcmp(v->fs_type, "ext4") == 0) {
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static constexpr int block_size = 4096;
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int raid_stride = v->logical_blk_size / block_size;
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int raid_stripe_width = v->erase_blk_size / block_size;
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// stride should be the max of 8kb and logical block size
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if (v->logical_blk_size != 0 && v->logical_blk_size < 8192) {
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raid_stride = 8192 / block_size;
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}
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const char* mke2fs_argv[] = { "/sbin/mke2fs_static",
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"-F",
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"-t",
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"ext4",
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"-b",
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nullptr,
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nullptr,
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nullptr,
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nullptr,
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nullptr,
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nullptr };
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int i = 5;
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std::string block_size_str = std::to_string(block_size);
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mke2fs_argv[i++] = block_size_str.c_str();
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std::string ext_args;
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if (v->erase_blk_size != 0 && v->logical_blk_size != 0) {
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ext_args = android::base::StringPrintf("stride=%d,stripe-width=%d", raid_stride,
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raid_stripe_width);
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mke2fs_argv[i++] = "-E";
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mke2fs_argv[i++] = ext_args.c_str();
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}
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mke2fs_argv[i++] = v->blk_device;
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std::string size_str = std::to_string(length / block_size);
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if (length != 0) {
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mke2fs_argv[i++] = size_str.c_str();
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}
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result = exec_cmd(mke2fs_argv[0], const_cast<char**>(mke2fs_argv));
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if (result == 0 && directory != nullptr) {
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const char* e2fsdroid_argv[] = { "/sbin/e2fsdroid_static",
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"-e",
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"-f",
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directory,
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"-a",
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volume,
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v->blk_device,
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nullptr };
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result = exec_cmd(e2fsdroid_argv[0], const_cast<char**>(e2fsdroid_argv));
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}
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} else { /* Has to be f2fs because we checked earlier. */
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char *num_sectors = nullptr;
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if (length >= 512 && asprintf(&num_sectors, "%zd", length / 512) <= 0) {
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LOG(ERROR) << "format_volume: failed to create " << v->fs_type
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<< " command for " << v->blk_device;
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return -1;
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}
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const char *f2fs_path = "/sbin/mkfs.f2fs";
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const char* const f2fs_argv[] = {"mkfs.f2fs", "-t", "-d1", v->blk_device, num_sectors, nullptr};
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result = exec_cmd(f2fs_path, (char* const*)f2fs_argv);
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free(num_sectors);
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}
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if (result != 0) {
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PLOG(ERROR) << "format_volume: make " << v->fs_type << " failed on " << v->blk_device;
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return -1;
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}
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return 0;
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}
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LOG(ERROR) << "format_volume: fs_type \"" << v->fs_type << "\" unsupported";
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return -1;
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}
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int format_volume(const char* volume) {
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return format_volume(volume, NULL);
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}
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int setup_install_mounts() {
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if (fstab == nullptr) {
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LOG(ERROR) << "can't set up install mounts: no fstab loaded";
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return -1;
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}
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for (int i = 0; i < fstab->num_entries; ++i) {
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const Volume* v = fstab->recs + i;
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// We don't want to do anything with "/".
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if (strcmp(v->mount_point, "/") == 0) {
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continue;
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}
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if (strcmp(v->mount_point, "/tmp") == 0 || strcmp(v->mount_point, "/cache") == 0) {
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if (ensure_path_mounted(v->mount_point) != 0) {
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LOG(ERROR) << "failed to mount " << v->mount_point;
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return -1;
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}
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} else {
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if (ensure_path_unmounted(v->mount_point) != 0) {
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LOG(ERROR) << "failed to unmount " << v->mount_point;
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return -1;
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}
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}
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}
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return 0;
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}
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