585 lines
17 KiB
C++
585 lines
17 KiB
C++
/*
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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 <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 <dirent.h>
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#include <fs_mgr.h>
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#include "mtdutils/mtdutils.h"
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#include "mtdutils/mounts.h"
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#include "roots.h"
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#include "common.h"
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#include "make_ext4fs.h"
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#include "wipe.h"
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#include "cryptfs.h"
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#include "voldclient.h"
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#include <blkid/blkid.h>
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static struct fstab *fstab = NULL;
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extern struct selabel_handle *sehandle;
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static int mkdir_p(const char* path, mode_t mode)
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{
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char dir[PATH_MAX];
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char* p;
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strcpy(dir, path);
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for (p = strchr(&dir[1], '/'); p != NULL; p = strchr(p+1, '/')) {
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*p = '\0';
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if (mkdir(dir, mode) != 0 && errno != EEXIST) {
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return -1;
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}
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*p = '/';
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}
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if (mkdir(dir, mode) != 0 && errno != EEXIST) {
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return -1;
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}
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return 0;
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}
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static void write_fstab_entry(Volume *v, FILE *file)
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{
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if (NULL != v && strcmp(v->fs_type, "mtd") != 0 && strcmp(v->fs_type, "emmc") != 0
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&& strcmp(v->fs_type, "bml") != 0 && !fs_mgr_is_voldmanaged(v)
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&& strncmp(v->blk_device, "/", 1) == 0
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&& strncmp(v->mount_point, "/", 1) == 0) {
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fprintf(file, "%s ", v->blk_device);
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fprintf(file, "%s ", v->mount_point);
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fprintf(file, "%s ", v->fs_type);
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fprintf(file, "%s 0 0\n", v->fs_options == NULL ? "defaults" : v->fs_options);
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}
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}
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int get_num_volumes() {
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return fstab->num_entries;
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}
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Volume* get_device_volumes() {
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return fstab->recs;
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}
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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("/etc/recovery.fstab");
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if (!fstab) {
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LOGE("failed to read /etc/recovery.fstab\n");
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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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LOGE("failed to add /tmp entry to fstab\n");
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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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// Create a boring /etc/fstab so tools like Busybox work
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FILE *file = fopen("/etc/fstab", "w");
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if (file == NULL) {
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LOGW("Unable to create /etc/fstab!\n");
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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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write_fstab_entry(v, file);
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}
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fclose(file);
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printf("\n");
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}
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bool volume_is_mountable(Volume *v)
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{
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return (fs_mgr_is_voldmanaged(v) ||
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!strcmp(v->fs_type, "yaffs2") ||
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!strcmp(v->fs_type, "ext4") ||
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!strcmp(v->fs_type, "f2fs") ||
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!strcmp(v->fs_type, "vfat"));
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}
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bool volume_is_readonly(Volume *v)
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{
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return (v->flags & MS_RDONLY);
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}
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bool volume_is_verity(Volume *v)
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{
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return fs_mgr_is_verified(v);
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}
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Volume* volume_for_path(const char* path) {
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Volume *rec = fs_mgr_get_entry_for_mount_point(fstab, path);
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if (rec == NULL)
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return rec;
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if (strcmp(rec->fs_type, "ext4") == 0 || strcmp(rec->fs_type, "f2fs") == 0 ||
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strcmp(rec->fs_type, "vfat") == 0) {
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char *detected_fs_type = blkid_get_tag_value(NULL, "TYPE", rec->blk_device);
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if (detected_fs_type == NULL)
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return rec;
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Volume *fetched_rec = rec;
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while (rec != NULL && strcmp(rec->fs_type, detected_fs_type) != 0)
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rec = fs_mgr_get_entry_for_mount_point_after(rec, fstab, path);
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if (rec == NULL)
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return fetched_rec;
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}
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return rec;
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}
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Volume* volume_for_label(const char* label) {
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int i;
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for (i = 0; i < get_num_volumes(); i++) {
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Volume* v = get_device_volumes() + i;
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if (v->label && !strcmp(v->label, label)) {
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return v;
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}
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}
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return NULL;
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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, bool force_rw) {
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Volume* v = volume_for_path(path);
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if (v == NULL) {
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LOGE("unknown volume for path [%s]\n", 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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int result;
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result = scan_mounted_volumes();
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if (result < 0) {
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LOGE("failed to scan mounted volumes\n");
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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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if (!fs_mgr_is_voldmanaged(v)) {
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const MountedVolume* mv =
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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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}
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mkdir_p(mount_point, 0755); // in case it doesn't already exist
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if (strcmp(v->fs_type, "yaffs2") == 0) {
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// mount an MTD partition as a YAFFS2 filesystem.
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mtd_scan_partitions();
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const MtdPartition* partition;
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partition = mtd_find_partition_by_name(v->blk_device);
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if (partition == NULL) {
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LOGE("failed to find \"%s\" partition to mount at \"%s\"\n",
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v->blk_device, mount_point);
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return -1;
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}
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return mtd_mount_partition(partition, mount_point, v->fs_type, 0);
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} else if (strcmp(v->fs_type, "ext4") == 0 ||
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strcmp(v->fs_type, "f2fs") == 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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unsigned long mntflags = v->flags;
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if (!force_rw) {
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if ((v->flags & MS_RDONLY) || fs_mgr_is_verified(v)) {
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mntflags |= MS_RDONLY;
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}
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}
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result = mount(v->blk_device, mount_point, v->fs_type,
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mntflags, v->fs_options);
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if (result == 0) return 0;
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LOGE("failed to mount %s (%s)\n", mount_point, strerror(errno));
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return -1;
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}
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LOGE("unknown fs_type \"%s\" for %s\n", v->fs_type, mount_point);
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return -1;
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}
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int ensure_volume_mounted(Volume* v, bool force_rw) {
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if (v == NULL) {
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LOGE("cannot mount unknown volume\n");
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return -1;
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}
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return ensure_path_mounted_at(v->mount_point, nullptr, force_rw);
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}
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int remount_no_selinux(const char* path) {
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int ret;
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char *old_fs_options;
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char *new_fs_options;
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char se_context[] = ",context=u:object_r:app_data_file:s0";
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Volume *v;
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// Backup original mount options
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v = volume_for_path(path);
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old_fs_options = v->fs_options;
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// Add SELinux mount override
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asprintf(&new_fs_options, "%s%s", v->fs_options, se_context);
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v->fs_options = new_fs_options;
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ensure_path_unmounted(path);
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ret = ensure_path_mounted(path);
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// Restore original mount options
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v->fs_options = old_fs_options;
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free(new_fs_options);
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return ret;
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}
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int ensure_path_mounted(const char* path, bool force_rw) {
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// Mount at the default mount point.
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return ensure_path_mounted_at(path, nullptr, force_rw);
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}
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int ensure_path_unmounted(const char* path, bool detach /* = false */) {
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Volume* v;
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if (memcmp(path, "/storage/", 9) == 0) {
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char label[PATH_MAX];
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const char* p = path+9;
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const char* q = strchr(p, '/');
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memset(label, 0, sizeof(label));
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if (q) {
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memcpy(label, p, q-p);
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}
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else {
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strcpy(label, p);
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}
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v = volume_for_label(label);
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}
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else {
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v = volume_for_path(path);
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}
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if (v == NULL) {
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LOGE("unknown volume for path [%s]\n", path);
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return -1;
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}
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return ensure_volume_unmounted(v, detach);
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}
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int ensure_volume_unmounted(Volume* v, bool detach /* = false */) {
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if (v == NULL) {
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LOGE("cannot unmount unknown volume\n");
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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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int result;
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result = scan_mounted_volumes();
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if (result < 0) {
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LOGE("failed to scan mounted volumes\n");
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return -1;
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}
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const MountedVolume* mv =
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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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if (detach) {
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result = unmount_mounted_volume_detach(mv);
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}
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else {
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result = unmount_mounted_volume(mv);
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}
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return result;
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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(-1);
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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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LOGE("%s failed with status %d\n", path, WEXITSTATUS(status));
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}
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return WEXITSTATUS(status);
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}
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static int rmtree_except(const char* path, const char* except)
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{
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char pathbuf[PATH_MAX];
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int rc = 0;
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DIR* dp = opendir(path);
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if (dp == NULL) {
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return -1;
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}
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struct dirent* de;
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while ((de = readdir(dp)) != NULL) {
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if (!strcmp(de->d_name, ".") || !strcmp(de->d_name, ".."))
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continue;
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if (except && !strcmp(de->d_name, except))
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continue;
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struct stat st;
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snprintf(pathbuf, sizeof(pathbuf), "%s/%s", path, de->d_name);
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rc = lstat(pathbuf, &st);
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if (rc != 0) {
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LOGE("Failed to stat %s\n", pathbuf);
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break;
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}
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if (S_ISDIR(st.st_mode)) {
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rc = rmtree_except(pathbuf, NULL);
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if (rc != 0)
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break;
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rc = rmdir(pathbuf);
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}
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else {
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rc = unlink(pathbuf);
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}
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if (rc != 0) {
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LOGI("Failed to remove %s: %s\n", pathbuf, strerror(errno));
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break;
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}
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}
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closedir(dp);
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return rc;
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}
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int format_volume(const char* volume, const char* directory, bool force) {
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if (strcmp(volume, "media") == 0) {
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if (!vdc->isEmulatedStorage()) {
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return 0;
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}
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if (ensure_path_mounted("/data") != 0) {
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LOGE("format_volume failed to mount /data\n");
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return -1;
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}
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remount_no_selinux("/data");
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int rc = 0;
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rc = rmtree_except("/data/media", NULL);
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ensure_path_unmounted("/data");
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return rc;
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}
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Volume* v = volume_for_path(volume);
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if (v == NULL) {
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LOGE("unknown volume \"%s\"\n", 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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LOGE("can't format_volume \"%s\"", 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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LOGE("can't give path \"%s\" to format_volume\n", volume);
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return -1;
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}
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if (!force && strcmp(volume, "/data") == 0 && vdc->isEmulatedStorage()) {
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if (ensure_path_mounted("/data") == 0) {
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remount_no_selinux("/data");
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// Preserve .layout_version to avoid "nesting bug"
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LOGI("Preserving layout version\n");
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unsigned char layout_buf[256];
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ssize_t layout_buflen = -1;
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int fd;
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fd = open("/data/.layout_version", O_RDONLY);
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if (fd != -1) {
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layout_buflen = read(fd, layout_buf, sizeof(layout_buf));
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close(fd);
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}
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int rc = rmtree_except("/data", "media");
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// Restore .layout_version
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if (layout_buflen > 0) {
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LOGI("Restoring layout version\n");
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fd = open("/data/.layout_version", O_WRONLY | O_CREAT | O_EXCL, 0600);
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if (fd != -1) {
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write(fd, layout_buf, layout_buflen);
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close(fd);
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}
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}
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ensure_path_unmounted(volume);
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return rc;
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}
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else {
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LOGE("format_volume failed to mount /data\n");
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return -1;
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}
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}
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if (ensure_path_unmounted(volume) != 0) {
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LOGE("format_volume failed to unmount \"%s\"\n", v->mount_point);
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return -1;
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}
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if (fs_mgr_is_voldmanaged(v)) {
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LOGE("can't format vold volume \"%s\"", volume);
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return -1;
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}
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if (strcmp(v->fs_type, "yaffs2") == 0 || strcmp(v->fs_type, "mtd") == 0) {
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mtd_scan_partitions();
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const MtdPartition* partition = mtd_find_partition_by_name(v->blk_device);
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if (partition == NULL) {
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LOGE("format_volume: no MTD partition \"%s\"\n", v->blk_device);
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return -1;
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}
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MtdWriteContext *write = mtd_write_partition(partition);
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if (write == NULL) {
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LOGW("format_volume: can't open MTD \"%s\"\n", v->blk_device);
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return -1;
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} else if (mtd_erase_blocks(write, -1) == (off_t) -1) {
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LOGW("format_volume: can't erase MTD \"%s\"\n", v->blk_device);
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mtd_write_close(write);
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return -1;
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} else if (mtd_write_close(write)) {
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LOGW("format_volume: can't close MTD \"%s\"\n", 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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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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LOGI("wiping %s\n", 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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LOGE("format_volume: failed to open %s\n", 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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length = -CRYPT_FOOTER_OFFSET;
|
|
}
|
|
int result;
|
|
if (strcmp(v->fs_type, "ext4") == 0) {
|
|
result = make_ext4fs_directory(v->blk_device, length, volume, sehandle, directory);
|
|
} else { /* Has to be f2fs because we checked earlier. */
|
|
char bytes_reserved[20], num_sectors[20];
|
|
const char* f2fs_argv[6] = {"mkfs.f2fs", "-t1"};
|
|
if (length < 0) {
|
|
snprintf(bytes_reserved, sizeof(bytes_reserved), "%zd", -length);
|
|
f2fs_argv[2] = "-r";
|
|
f2fs_argv[3] = bytes_reserved;
|
|
f2fs_argv[4] = v->blk_device;
|
|
f2fs_argv[5] = NULL;
|
|
} else {
|
|
/* num_sectors can be zero which mean whole device space */
|
|
snprintf(num_sectors, sizeof(num_sectors), "%zd", length / 512);
|
|
f2fs_argv[2] = v->blk_device;
|
|
f2fs_argv[3] = num_sectors;
|
|
f2fs_argv[4] = NULL;
|
|
}
|
|
const char *f2fs_path = "/sbin/mkfs.f2fs";
|
|
|
|
result = exec_cmd(f2fs_path, (char* const*)f2fs_argv);
|
|
}
|
|
if (result != 0) {
|
|
LOGE("format_volume: make %s failed on %s with %d(%s)\n", v->fs_type, v->blk_device, result, strerror(errno));
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
LOGE("format_volume: fs_type \"%s\" unsupported\n", v->fs_type);
|
|
return -1;
|
|
}
|
|
|
|
int format_volume(const char* volume, bool force) {
|
|
return format_volume(volume, NULL, force);
|
|
}
|
|
|
|
int setup_install_mounts() {
|
|
if (fstab == NULL) {
|
|
LOGE("can't set up install mounts: no fstab loaded\n");
|
|
return -1;
|
|
}
|
|
for (int i = 0; i < fstab->num_entries; ++i) {
|
|
Volume* v = fstab->recs + i;
|
|
|
|
if (strcmp(v->mount_point, "/tmp") == 0 ||
|
|
strcmp(v->mount_point, "/cache") == 0) {
|
|
if (ensure_path_mounted(v->mount_point) != 0) {
|
|
LOGE("failed to mount %s\n", v->mount_point);
|
|
return -1;
|
|
}
|
|
|
|
} else {
|
|
// datamedia and anything managed by vold must be unmounted
|
|
// with the detach flag to ensure that FUSE works.
|
|
bool detach = false;
|
|
if (vdc->isEmulatedStorage() && strcmp(v->mount_point, "/data") == 0) {
|
|
detach = true;
|
|
}
|
|
if (ensure_volume_unmounted(v, detach) != 0) {
|
|
LOGE("failed to unmount %s\n", v->mount_point);
|
|
return -1;
|
|
}
|
|
}
|
|
}
|
|
return 0;
|
|
}
|