错误日志：
E/cutils ( 1180): Not a directory: /storage/sdcard0
W/Zygote ( 1180): Failed to mount emulated storage: 22
E/Zygote ( 1180): Cannot continue without emulated storage
F/art ( 1180): art/runtime/jni_internal.cc:776] JNI FatalError called: RuntimeAbort
F/libc ( 1180): Fatal signal 6 (SIGABRT), code -6 in tid 1180 (main)
日志输出代码：
frameworks//base/core/jni/com_android_internal_os_Zygote.cpp
// Utility routine to fork zygote and specialize the child process.
static pid_t
ForkAndSpecializeCommon
(JNIEnv* env, uid_t uid, gid_t gid, jintArray javaGids,
jint debug_flags, jobjectArray javaRlimits,
jlong permittedCapabilities, jlong effectiveCapabilities,
jint mount_external,
jstring java_se_info, jstring java_se_name,
bool is_system_server, jintArray fdsToClose,
jstring instructionSet, jstring dataDir) {
if (!
MountEmulatedStorage
(uid, mount_external, need_native_bridge)) {
ALOGW(“Failed to mount emulated storage: %d”, errno);
if (errno == ENOTCONN || errno == EROFS) {
// When device is actively encrypting, we get ENOTCONN here
// since FUSE was mounted before the framework restarted.
// When encrypted device is booting, we get EROFS since
// FUSE hasn’t been created yet by init.
// In either case, continue without external storage.
} else {
ALOGE(“Cannot continue without emulated storage”);
RuntimeAbort(env);
}
}
static bool MountEmulatedStorage(uid_t uid, jint mount_mode, bool force_mount_namespace) {
if (mount_mode == MOUNT_EXTERNAL_MULTIUSER || mount_mode == MOUNT_EXTERNAL_MULTIUSER_ALL) {
// These paths must already be created by init.rc
const char* source = getenv(“EMULATED_STORAGE_SOURCE”);
const char* target = getenv(“EMULATED_STORAGE_TARGET”);
const char* legacy = getenv(“EXTERNAL_STORAGE”);
//这几个环境变量是从init.rc中设置的
//分区没法加载，怀疑是变量设置有问题
//查找设置果然是这个问题
if (source == NULL || target == NULL || legacy == NULL) {
ALOGW(“Storage environment undefined; unable to provide external storage”);
return false;
}
// Prepare source paths
// /mnt/shell/emulated/0
const String8 source_user(String8::format(“%s/%d”, source, user_id));
// /storage/emulated/0
const String8 target_user(String8::format(“%s/%d”, target, user_id));
if (fs_prepare_dir(source_user.string(), 0000, 0, 0) == -1
|| fs_prepare_dir(target_user.string(), 0000, 0, 0) == -1) {
return false;
}
if (mount_mode == MOUNT_EXTERNAL_MULTIUSER_ALL) {
// Mount entire external storage tree for all users
if (TEMP_FAILURE_RETRY(mount(source, target, NULL, MS_BIND, NULL)) == -1) {
ALOGW(“Failed to mount %s to %s :%d”, source, target, errno);
return false;
}
} else {
// Only mount user-specific external storage
if (TEMP_FAILURE_RETRY(
mount(source_user.string(), target_user.string(), NULL, MS_BIND, NULL)) == -1) {
ALOGW(“Failed to mount %s to %s: %d”, source_user.string(), target_user.string(), errno);
return false;
}
}
if (fs_prepare_dir(legacy, 0000, 0, 0) == -1) {
return false;
}