背景：
格式化SD后，sd卡显示的名称会变化。
这个问题跟踪了一下格式化的流程：
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| //SYSTEM/packages/apps/Settings/src/com/android/settings/deviceinfo/StorageWizardFormatConfirm.java
builder.setPositiveButton(
TextUtils.expandTemplate(getText(R.string.storage_menu_format_option),
disk.getShortDescription()),
(dialog, which) -> {
final Intent intent = new Intent(context, StorageWizardFormatProgress.class);
intent.putExtra(EXTRA_DISK_ID, diskId);
intent.putExtra(EXTRA_FORMAT_FORGET_UUID, formatForgetUuid);
intent.putExtra(EXTRA_FORMAT_PRIVATE, formatPrivate);
context.startActivity(intent);
});
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| ///mnt/media/FH22/AP/SYSTEM/packages/apps/Settings/src/com/android/settings/deviceinfo/StorageWizardFormatProgress.java
setHeaderText(R.string.storage_wizard_format_progress_title, getDiskShortDescription());
setBodyText(R.string.storage_wizard_format_progress_body, getDiskDescription());
setBackButtonVisibility(View.INVISIBLE);
setNextButtonVisibility(View.INVISIBLE);
mTask = (PartitionTask) getLastCustomNonConfigurationInstance();
if (mTask == null) {
mTask = new PartitionTask();
mTask.setActivity(this);
mTask.execute();
} else {
mTask.setActivity(this);
}
@Override
protected Exception doInBackground(Void... params) {
final StorageWizardFormatProgress activity = mActivity;
final StorageManager storage = mActivity.mStorage;
try {
if (activity.mFormatPrivate) {
storage.partitionPrivate(activity.mDisk.getId());
publishProgress(40);
final VolumeInfo privateVol = activity.findFirstVolume(TYPE_PRIVATE, 50);
final CompletableFuture<PersistableBundle> result = new CompletableFuture<>();
if(null != privateVol) {
storage.benchmark(privateVol.getId(), new IVoldTaskListener.Stub() {
@Override
public void onStatus(int status, PersistableBundle extras) {
// Map benchmark 0-100% progress onto 40-80%
publishProgress(40 + ((status * 40) / 100));
}
@Override
public void onFinished(int status, PersistableBundle extras) {
result.complete(extras);
}
});
mPrivateBench = result.get(60, TimeUnit.SECONDS).getLong("run",
Long.MAX_VALUE);
}
// If we just adopted the device that had been providing
// physical storage, then automatically move storage to the
// new emulated volume.
if (activity.mDisk.isDefaultPrimary()
&& Objects.equals(storage.getPrimaryStorageUuid(),
StorageManager.UUID_PRIMARY_PHYSICAL)) {
Log.d(TAG, "Just formatted primary physical; silently moving "
+ "storage to new emulated volume");
storage.setPrimaryStorageUuid(privateVol.getFsUuid(), new SilentObserver());
}
} else {
storage.partitionPublic(activity.mDisk.getId());
}
return null;
} catch (Exception e) {
return e;
}
}
|
storage.partitionPublic(activity.mDisk.getId());
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| ///mnt/media/FH22/AP/SYSTEM/frameworks/base/core/java/android/os/storage/StorageManager.java
public void partitionPublic(String diskId) {
try {
mStorageManager.partitionPublic(diskId);
} catch (RemoteException e) {
throw e.rethrowFromSystemServer();
}
}
///mnt/media/FH22/AP/SYSTEM/frameworks/base/services/core/java/com/android/server/StorageManagerService.java
public void partitionPublic(String diskId) {
super.partitionPublic_enforcePermission();
final CountDownLatch latch = findOrCreateDiskScanLatch(diskId);
try {
mVold.partition(diskId, IVold.PARTITION_TYPE_PUBLIC, -1);
waitForLatch(latch, "partitionPublic", 3 * DateUtils.MINUTE_IN_MILLIS);
} catch (Exception e) {
Slog.wtf(TAG, e);
}
}
|
我们根据sdka 的exfat格式，有个aidl 调用，然后会调用到exfat 的vold里面来出来format
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| ///mnt/media/FH22/AP/SYSTEM/system/vold/fs/Exfat.cpp
static const char* kMkfsPath = "/system/bin/mkfs.exfat";
static const char* kFsckPath = "/system/bin/fsck.exfat";
status_t Format(const std::string& source) {
std::vector<std::string> cmd;
cmd.push_back(kMkfsPath);
cmd.push_back("-n");
cmd.push_back("android");
cmd.push_back(source);
int rc = ForkExecvp(cmd);
if (rc == 0) {
LOG(INFO) << "Format OK";
return 0;
} else {
LOG(ERROR) << "Format failed (code " << rc << ")";
errno = EIO;
return -1;
}
return 0;
}
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| cmd.push_back("-n");
cmd.push_back("android");
|
通过"/system/bin/mkfs.exfat 进行了格式化， 通过 -n 添加了标签
至于显示部分
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| ///mnt/media/FH22/AP/SYSTEM/frameworks/base/core/java/android/os/storage/StorageManager.java
@UnsupportedAppUsage
public @Nullable String getBestVolumeDescription(VolumeInfo vol) {
if (vol == null) return null;
//wentao
Log.d("wentao", "getBestVolumeDescription vol :"+ vol.toString());
// Nickname always takes precedence when defined
if (!TextUtils.isEmpty(vol.fsUuid)) {
final VolumeRecord rec = findRecordByUuid(vol.fsUuid);
if (rec != null && !TextUtils.isEmpty(rec.nickname)) {
Log.d("wentao", "getBestVolumeDescription rec.nickname :"+ rec.nickname);
return rec.nickname;
}
}
if (!TextUtils.isEmpty(vol.getDescription())) {
Log.d("wentao", "getBestVolumeDescription vol.getDescription() :"+ vol.getDescription());
return vol.getDescription();
}
if (vol.disk != null) {
Log.d("wentao", "getBestVolumeDescription vol.disk.getDescription() :"+ vol.disk.getDescription());
return vol.disk.getDescription();
}
return null;
}
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getBestVolumeDescription 里面有个显示优先级：
1 nickname 自定义的别名
2 volume description 这个一般就是 volume的label
3 disk description 这个一般就是特殊厂商有固定的厂商名称
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| // Our goal here is to give the user a meaningful label, ideally
// matching whatever is silk-screened on the card. To reduce
// user confusion, this list doesn't contain white-label manfid.
switch (manfid) {
// clang-format off
case 0x000003: mLabel = "SanDisk"; break;
case 0x00001b: mLabel = "Samsung"; break;
case 0x000028: mLabel = "Lexar"; break;
case 0x000074: mLabel = "Transcend"; break;
// clang-format on
|
如果什么都没有，就会显示unknow。
android 在格式化后，会打上android 标签。所以才会以android显示
wentao