FUSE 文件系统
- Fuse包含一个内核模块和一个用户空间守护进程
- 内核模块加载时被注册成 Linux 虚拟文件系统的一个 fuse 文件系统驱动
- 还注册了一个/dev/fuse的块设备。该块设备作为fuse daemon与内核通信的桥梁，fuse daemon通过/dev/fuse读取fuse request，处理后将reply写入/dev/fuse
内核模块
rk3568_android_11/kernel/fs/fuse$ tree
.
├── acl.c // 管理 FUSE 文件系统中的访问控制列表（ACL），用于定义更细粒度的权限管理
├── control.c // 处理与 FUSE 控制接口相关的逻辑，例如通过特殊文件 /dev/fuse 与用户空间交互
├── cuse.c
├── dev.c // 定义 FUSE 文件系统的设备操作，比如初始化 /dev/fuse 设备节点
├── dir.c // 处理目录相关的操作，例如创建、读取和删除目录
├── file.c // 处理文件的读写操作，是核心文件之一
├── fuse_i.h
├── inode.c // 管理 FUSE 文件系统的 inode（文件系统的元数据），例如文件类型、大小、权限等信息
├── Kconfig
├── Makefile
├── OWNERS
└── xattr.c // 实现扩展属性（Extended Attributes）功能，用于为文件和目录存储额外的元数据
rk3568 android 11
fuse 分区
rk3568_r:/ $ mount | grep fuse
none on /sys/fs/fuse/connections type fusectl (rw,relatime)
/dev/fuse on /mnt/user/0/emulated type fuse (rw,lazytime,nosuid,nodev,noexec,noatime,user_id=0,group_id=0,allow_other)
/dev/fuse on /mnt/installer/0/emulated type fuse (rw,lazytime,nosuid,nodev,noexec,noatime,user_id=0,group_id=0,allow_other)
/dev/fuse on /mnt/androidwritable/0/emulated type fuse (rw,lazytime,nosuid,nodev,noexec,noatime,user_id=0,group_id=0,allow_other)
/dev/fuse on /storage/emulated type fuse (rw,lazytime,nosuid,nodev,noexec,noatime,user_id=0,group_id=0,allow_other)
# TF卡
/dev/fuse on /mnt/user/0/4552-4F43 type fuse (rw,lazytime,nosuid,nodev,noexec,noatime,user_id=0,group_id=0,allow_other)
/dev/fuse on /mnt/installer/0/4552-4F43 type fuse (rw,lazytime,nosuid,nodev,noexec,noatime,user_id=0,group_id=0,allow_other)
/dev/fuse on /mnt/androidwritable/0/4552-4F43 type fuse (rw,lazytime,nosuid,nodev,noexec,noatime,user_id=0,group_id=0,allow_other)
/dev/fuse on /storage/4552-4F43 type fuse (rw,lazytime,nosuid,nodev,noexec,noatime,user_id=0,group_id=0,allow_other)
FuseDaemon
Android 11整个FUSE文件系统的用户态Daemon是在MediaProvider里面实现的，是用JNI来实现的。而FUSE文件系统的核心代码的实现都是在libfuse中，由FuseDaemon来调用的
MediaProvider
lxg@lxg:~/code/project/rk3568_android_11/packages/providers/MediaProvider/src$ tree
.
└── com
└── android
└── providers
└── media
├── CacheClearingActivity.java
├── DatabaseHelper.java
├── fuse
│ ├── ExternalStorageServiceImpl.java
│ └── FuseDaemon.java
├── IdleService.java
├── LocalCallingIdentity.java
├── MediaApplication.java
├── MediaDocumentsProvider.java
├── MediaProvider.java
├── MediaReceiver.java
├── MediaService.java
├── MediaUpgradeReceiver.java
├── PermissionActivity.java
├── playlist
│ ├── M3uPlaylistPersister.java
│ ├── Playlist.java
│ ├── PlaylistPersister.java
│ ├── PlsPlaylistPersister.java
│ ├── WplPlaylistPersister.java
│ └── XspfPlaylistPersister.java
├── scan
│ ├── LegacyMediaScanner.java
│ ├── MediaScanner.java
│ ├── ModernMediaScanner.java
│ └── NullMediaScanner.java
└── util
├── BackgroundThread.java
├── CachedSupplier.java
├── DatabaseUtils.java
├── ExifUtils.java
├── FileUtils.java
├── ForegroundThread.java
├── HandlerExecutor.java
├── IsoInterface.java
├── Logging.java
├── LongArray.java
├── Memory.java
├── Metrics.java
├── MimeUtils.java
├── PermissionUtils.java
├── RedactingFileDescriptor.java
├── SQLiteQueryBuilder.java
├── SQLiteTokenizer.java
└── XmpInterface.java
lxg@lxg:~/code/project/rk3568_android_11/packages/providers/MediaProvider/jni$ tree
.
├── Android.bp
├── com_android_providers_media_FuseDaemon.cpp
├── FuseDaemon.cpp
├── FuseDaemon.h
├── fuse_node_test.xml
├── FuseUtils.cpp
├── FuseUtilsTest.cpp
├── FuseUtilsTest.xml
├── include
│ └── libfuse_jni
│ ├── FuseUtils.h
│ ├── ReaddirHelper.h
│ └── RedactionInfo.h
├── jni_init.cpp
├── MediaProviderWrapper.cpp
├── MediaProviderWrapper.h
├── node.cpp
├── node-inl.h
├── node_test.cpp
├── ReaddirHelper.cpp
├── RedactionInfo.cpp
├── RedactionInfoTest.cpp
├── RedactionInfoTest.xml
└── TEST_MAPPING
libfuse
lxg@lxg:~/code/project/rk3568_android_11/external/libfuse$ tree
.
├── Android.bp
├── Android.patch
├── AUTHORS
├── GPL2.txt
├── include
│ ├── cuse_lowlevel.h
│ ├── fuse_common.h
│ ├── fuse.h
│ ├── fuse_kernel.h
│ ├── fuse_log.h
│ ├── fuse_lowlevel.h
│ ├── fuse_opt.h
│ └── meson.build
├── LGPL2.txt
├── lib
│ ├── android_config.h
│ ├── buffer.c
│ ├── config.h
│ ├── cuse_lowlevel.c
│ ├── fuse.c
│ ├── fuse_i.h
│ ├── fuse_log.c
│ ├── fuse_loop.c
│ ├── fuse_loop_mt.c
│ ├── fuse_lowlevel.c
│ ├── fuse_misc.h
│ ├── fuse_opt.c
│ ├── fuse_signals.c
│ ├── fuse_versionscript
│ ├── helper.c
│ ├── meson.build
│ ├── modules
│ │ ├── iconv.c
│ │ └── subdir.c
│ ├── mount_bsd.c
│ ├── mount.c
│ ├── mount_util.c
│ └── mount_util.h
├── LICENSE
├── meson.build
├── METADATA
├── MODULE_LICENSE_LGPL2
├── NOTICE -> LGPL2.txt
└── README.md
开机过程
SystemServer
public final class SystemServer {
private void startOtherServices(@NonNull TimingsTraceAndSlog t) {
t.traceBegin("StartStorageManagerService");
try {
/*
* NotificationManagerService is dependant on StorageManagerService,
* (for media / usb notifications) so we must start StorageManagerService first.
*/
mSystemServiceManager.startService(STORAGE_MANAGER_SERVICE_CLASS);
storageManager = IStorageManager.Stub.asInterface(
ServiceManager.getService("mount"));
} catch (Throwable e) {
reportWtf("starting StorageManagerService", e);
}
t.traceEnd();
t.traceBegin("StartStorageStatsService");
try {
mSystemServiceManager.startService(STORAGE_STATS_SERVICE_CLASS);
} catch (Throwable e) {
reportWtf("starting StorageStatsService", e);
}
t.traceEnd();
}
}
}
StorageManagerService
class StorageManagerService extends IStorageManager.Stub
implements Watchdog.Monitor, ScreenObserver {
public static class Lifecycle extends SystemService {
@Override
public void onStart() {
mStorageManagerService = new StorageManagerService(getContext());
publishBinderService("mount", mStorageManagerService);
mStorageManagerService.start();
}
}
private void start() {
connectStoraged();
connectVold();
}
private void connectStoraged() {
IBinder binder = ServiceManager.getService("storaged");
if (binder != null) {
try {
binder.linkToDeath(new DeathRecipient() {
@Override
public void binderDied() {
Slog.w(TAG, "storaged died; reconnecting");
mStoraged = null;
connectStoraged();
}
}, 0);
} catch (RemoteException e) {
binder = null;
}
}
if (binder != null) {
mStoraged = IStoraged.Stub.asInterface(binder);
} else {
Slog.w(TAG, "storaged not found; trying again");
}
if (mStoraged == null) {
BackgroundThread.getHandler().postDelayed(() -> {
connectStoraged();
}, DateUtils.SECOND_IN_MILLIS);
} else {
onDaemonConnected();
}
}
private void connectVold() {
IBinder binder = ServiceManager.getService("vold");
if (binder != null) {
try {
binder.linkToDeath(new DeathRecipient() {
@Override
public void binderDied() {
Slog.w(TAG, "vold died; reconnecting");
mVold = null;
connectVold();
}
}, 0);
} catch (RemoteException e) {
binder = null;
}
}
if (binder != null) {
mVold = IVold.Stub.asInterface(binder);
try {
mVold.setListener(mListener);
} catch (RemoteException e) {
mVold = null;
Slog.w(TAG, "vold listener rejected; trying again", e);
}
} else {
Slog.w(TAG, "vold not found; trying again");
}
if (mVold == null) {
BackgroundThread.getHandler().postDelayed(() -> {
connectVold();
}, DateUtils.SECOND_IN_MILLIS);
} else {
onDaemonConnected();
}
}
}
VOLD
Vold: Volume Daemon, 用于管理和控制Android平台外部存储设备的后台进程,这些管理和控制,包括SD卡的插拔事件检测/SD卡挂载/卸载/格式化等，是一个开机启动的服务
system/vold/vold.rc
service vold /system/bin/vold \
--blkid_context=u:r:blkid:s0 --blkid_untrusted_context=u:r:blkid_untrusted:s0 \
--fsck_context=u:r:fsck:s0 --fsck_untrusted_context=u:r:fsck_untrusted:s0
class core
ioprio be 2
writepid /dev/cpuset/foreground/tasks
shutdown critical
group root reserved_disk
Storaged
storaged主要就是实现存储的一些统计信息，如每个UID的IO访问统计，主要就是定期访问/proc/uid_io/stats，给dumpsys提供存储相关的信息，是一个开机启动的服务
system/core/storaged/storaged.rc
service storaged /system/bin/storaged
class main
capabilities DAC_READ_SEARCH
priority 10
file /d/mmc0/mmc0:0001/ext_csd r
writepid /dev/cpuset/system-background/tasks
user root
group package_info
内部存储卡的挂载流程
Android启动后会默认首先挂载内卡，从开机动画结束开始，进行内卡的挂载操作，主要涉及ActivityManagerService，VOLD，StorageManagerService等模块。
dumpsys mount
设置分区存储白名单
adb shell device_config put storage_native_boot forced_scoped_storage_whitelist com.ctq.simkey.sdk.appa
adb shell device_config get storage_native_boot forced_scoped_storage_whitelist
adb shell dumpsys mount
Disks:
DiskInfo{disk:179,0}:
flags=SD size=5699010560 label=
sysPath=/sys//devices/platform/fe2b0000.dwmmc/mmc_host/mmc0/mmc0:0001/block/mmcblk0
Volumes:
VolumeInfo{public:179,1}:
type=PUBLIC diskId=disk:179,0 partGuid= mountFlags=VISIBLE mountUserId=0 state=MOUNTED
fsType=vfat fsUuid=4552-4F43 fsLabel=
path=/storage/4552-4F43 internalPath=/mnt/media_rw/4552-4F43
VolumeInfo{emulated;0}:
type=EMULATED diskId=null partGuid= mountFlags=PRIMARY|VISIBLE mountUserId=0 state=MOUNTED
fsType=null fsUuid=null fsLabel=null
path=/storage/emulated internalPath=/data/media
Records:
VolumeRecord:
type=PUBLIC fsUuid=4552-4F43 partGuid=
nickname=null userFlags=0
createdMillis=2025-01-21 09:27:06 lastSeenMillis=2025-01-22 01:56:06 lastTrimMillis=unknown lastBenchMillis=unknown
Primary storage UUID: null
Internal storage (null) total size: 16000000000 (16777216000000000 MiB)
Local unlocked users: [0]
System unlocked users: [0]
Isolated storage, local feature flag: 0
Isolated storage, remote feature flag: 0
Isolated storage, resolved: true
Forced scoped storage app list: com.ctq.simkey.sdk.appa
isAutomotive:false
mObbMounts:
mObbPathToStateMap:
Last maintenance: 2025-01-21 09:26:5
外部存储卡的挂载过程
MediaProvider
u0_a49 1281 274 13985964 155456 0 0 S com.android.providers.media.module
TF卡拔出日志
2025-01-22 14:01:22.899 1265-1415 MediaStore com.android.providers.media.module V Examining volume emulated;0 with name external_primary and state mounted
2025-01-22 14:01:22.899 1265-1415 MediaStore com.android.providers.media.module V Examining volume public:179,1 with name 4552-4f43 and state ejecting
2025-01-22 14:01:22.900 1265-1415 MediaProvider com.android.providers.media.module V Updated external volumes to: {external_primary}
2025-01-22 14:01:22.919 1265-1265 MediaStore com.android.providers.media.module V Examining volume emulated;0 with name external_primary and state mounted
2025-01-22 14:01:22.919 1265-1265 MediaStore com.android.providers.media.module V Examining volume public:179,1 with name 4552-4f43 and state ejecting
2025-01-22 14:01:22.920 1265-1265 MediaProvider com.android.providers.media.module V Updated external volumes to: {external_primary}
2025-01-22 14:01:22.939 1265-1265 MediaStore com.android.providers.media.module V Examining volume emulated;0 with name external_primary and state mounted
2025-01-22 14:01:22.939 1265-1265 MediaStore com.android.providers.media.module V Examining volume public:179,1 with name 4552-4f43 and state ejecting
2025-01-22 14:01:22.939 1265-1265 MediaProvider com.android.providers.media.module V Updated external volumes to: {external_primary}
2025-01-22 14:01:23.394 1265-1563 FuseDaemon com.android.providers.media.module I Ending fuse...
2025-01-22 14:01:23.394 1265-1563 FuseDaemon com.android.providers.media.module I DESTROY /storage/4552-4F43
2025-01-22 14:01:23.394 1265-1563 FuseDaemon com.android.providers.media.module I Ended fuse
2025-01-22 14:01:23.395 1265-1563 FuseDaemonThread com.android.providers.media.module I Exiting thread for public:179,1 ...
2025-01-22 14:01:23.395 1265-1563 ExternalSt...erviceImpl com.android.providers.media.module I Exiting session for id: public:179,1
2025-01-22 14:01:23.395 1265-1563 FuseDaemonThread com.android.providers.media.module I Exited thread for public:179,1
2025-01-22 14:01:23.426 1265-1415 MediaStore com.android.providers.media.module V Examining volume emulated;0 with name external_primary and state mounted
2025-01-22 14:01:23.426 1265-1415 MediaProvider com.android.providers.media.module V Updated external volumes to: {external_primary}
TF卡插入日志
2025-01-22 14:04:26.519 1265-1415 ExternalSt...erviceImpl com.android.providers.media.module I Starting session for id: public:179,1
2025-01-22 14:04:26.520 1265-1415 FuseDaemonThread com.android.providers.media.module V Waiting 1000ms for FUSE start. Count 4
2025-01-22 14:04:26.521 1265-2190 FuseDaemonThread com.android.providers.media.module I Starting thread for public:179,1 ...
2025-01-22 14:04:26.522 1265-2190 FuseDaemon com.android.providers.media.module I Starting fuse...
2025-01-22 14:04:27.600 1265-1415 MediaStore com.android.providers.media.module V Examining volume emulated;0 with name external_primary and state mounted
2025-01-22 14:04:27.600 1265-1415 MediaStore com.android.providers.media.module V Examining volume public:179,1 with name 4552-4f43 and state mounted
2025-01-22 14:04:27.600 1265-1415 MediaProvider com.android.providers.media.module V Updated external volumes to: {external_primary, 4552-4f43}
2025-01-22 14:04:27.630 1265-1265 MediaStore com.android.providers.media.module V Examining volume emulated;0 with name external_primary and state mounted
2025-01-22 14:04:27.630 1265-1265 MediaStore com.android.providers.media.module V Examining volume public:179,1 with name 4552-4f43 and state mounted
2025-01-22 14:04:27.630 1265-1265 MediaProvider com.android.providers.media.module V Updated external volumes to: {external_primary, 4552-4f43}
2025-01-22 14:04:27.645 1265-1415 MediaStore com.android.providers.media.module V Examining volume emulated;0 with name external_primary and state mounted
2025-01-22 14:04:27.645 1265-1415 MediaStore com.android.providers.media.module V Examining volume public:179,1 with name 4552-4f43 and state mounted
2025-01-22 14:04:27.645 1265-1415 MediaProvider com.android.providers.media.module V Updated external volumes to: {external_primary, 4552-4f43}
2025-01-22 14:04:27.679 1265-1265 MediaStore com.android.providers.media.module V Examining volume emulated;0 with name external_primary and state mounted
2025-01-22 14:04:27.679 1265-1265 MediaStore com.android.providers.media.module V Examining volume public:179,1 with name 4552-4f43 and state mounted
2025-01-22 14:04:27.679 1265-1265 MediaProvider com.android.providers.media.module V Updated external volumes to: {external_primary, 4552-4f43}
2025-01-22 14:04:27.695 1265-1415 MediaStore com.android.providers.media.module V Examining volume emulated;0 with name external_primary and state mounted
2025-01-22 14:04:27.695 1265-1415 MediaStore com.android.providers.media.module V Examining volume public:179,1 with name 4552-4f43 and state mounted
2025-01-22 14:04:27.695 1265-1415 MediaProvider com.android.providers.media.module V Updated external volumes to: {external_primary, 4552-4f43}
2025-01-22 14:04:27.704 1265-1265 MediaStore com.android.providers.media.module V Examining volume emulated;0 with name external_primary and state mounted
2025-01-22 14:04:27.705 1265-1265 MediaStore com.android.providers.media.module V Examining volume public:179,1 with name 4552-4f43 and state mounted
2025-01-22 14:04:27.705 1265-1265 MediaProvider com.android.providers.media.module V Updated external volumes to: {external_primary, 4552-4f43}
2025-01-22 14:04:27.723 1265-1265 MediaStore com.android.providers.media.module V Examining volume emulated;0 with name external_primary and state mounted
2025-01-22 14:04:27.723 1265-1265 MediaStore com.android.providers.media.module V Examining volume public:179,1 with name 4552-4f43 and state mounted
2025-01-22 14:04:27.723 1265-1265 MediaProvider com.android.providers.media.module V Updated external volumes to: {external_primary, 4552-4f43}
2025-01-22 14:04:27.747 1265-1265 MediaStore com.android.providers.media.module V Examining volume emulated;0 with name external_primary and state mounted
2025-01-22 14:04:27.747 1265-1265 MediaStore com.android.providers.media.module V Examining volume public:179,1 with name 4552-4f43 and state mounted
2025-01-22 14:04:27.748 1265-1265 MediaProvider com.android.providers.media.module V Updated external volumes to: {external_primary, 4552-4f43}
2025-01-22 14:04:27.793 1265-1988 MediaProvider com.android.providers.media.module I Begin Intent { act=android.intent.action.MEDIA_MOUNTED dat=file:///storage/4552-4F43 flg=0x5000010 cmp=com.android.providers.media.module/com.android.providers.media.MediaService (has extras) }
2025-01-22 14:04:27.813 1265-1988 MediaProvider com.android.providers.media.module I Scanned internal due to REASON_MOUNTED, found 2 items in 11ms, 0 inserts 0 updates 0 deletes
2025-01-22 14:04:27.817 1265-1988 ModernMediaScanner com.android.providers.media.module W Failed to visit /oem/media: java.nio.file.NoSuchFileException: /oem/media
2025-01-22 14:04:27.820 1265-1988 MediaProvider com.android.providers.media.module I Scanned internal due to REASON_MOUNTED, found 0 items in 4ms, 0 inserts 0 updates 0 deletes
2025-01-22 14:04:28.435 1265-1988 MediaProvider com.android.providers.media.module I Scanned internal due to REASON_MOUNTED, found 230 items in 611ms, 0 inserts 7 updates 0 deletes
2025-01-22 14:04:28.616 1265-1988 MediaProvider com.android.providers.media.module I Scanned 4552-4f43 due to REASON_MOUNTED, found 25 items in 163ms, 0 inserts 0 updates 0 deletes
2025-01-22 14:04:28.621 1265-1988 MediaProvider com.android.providers.media.module I End Intent { act=android.intent.action.MEDIA_MOUNTED dat=file:///storage/4552-4F43 flg=0x5000010 cmp=com.android.providers.media.module/com.android.providers.media.MediaService (has extras) }
2025-01-22 14:04:28.622 1265-1988 MediaProvider com.android.providers.media.module I Begin Intent { act=android.intent.action.MEDIA_MOUNTED dat=file:///storage/4552-4F43 flg=0x5000010 cmp=com.android.providers.media.module/com.android.providers.media.MediaService (has extras) }
2025-01-22 14:04:28.640 1265-1988 MediaProvider com.android.providers.media.module I Scanned internal due to REASON_MOUNTED, found 2 items in 10ms, 0 inserts 0 updates 0 deletes
2025-01-22 14:04:28.645 1265-1988 ModernMediaScanner com.android.providers.media.module W Failed to visit /oem/media: java.nio.file.NoSuchFileException: /oem/media
2025-01-22 14:04:28.649 1265-1988 MediaProvider com.android.providers.media.module I Scanned internal due to REASON_MOUNTED, found 0 items in 5ms, 0 inserts 0 updates 0 deletes
2025-01-22 14:04:29.190 1265-1988 MediaProvider com.android.providers.media.module I Scanned internal due to REASON_MOUNTED, found 230 items in 537ms, 0 inserts 7 updates 0 deletes
2025-01-22 14:04:29.270 1265-1988 MediaProvider com.android.providers.media.module I Scanned 4552-4f43 due to REASON_MOUNTED, found 25 items in 67ms, 0 inserts 0 updates 0 deletes
2025-01-22 14:04:29.274 1265-1988 MediaProvider com.android.providers.media.module I End Intent { act=android.intent.action.MEDIA_MOUNTED dat=file:///storage/4552-4F43 flg=0x5000010 cmp=com.android.providers.media.module/com.android.providers.media.MediaService (has extras) }
system_process
TF 卡插入日志
2025-01-22 14:09:49.603 494-2129 StorageManagerService system_process D -----for all public volume is visible-----
2025-01-22 14:09:49.604 494-576 StorageManagerService system_process I Mounting volume VolumeInfo{public:179,1}:
type=PUBLIC diskId=disk:179,0 partGuid= mountFlags=VISIBLE mountUserId=0
state=UNMOUNTED
fsType=null fsUuid=null fsLabel=null
path=null internalPath=null
2025-01-22 14:09:50.227 494-576 StorageSes...Controller system_process I On volume mount VolumeInfo{public:179,1}:
type=PUBLIC diskId=disk:179,0 partGuid= mountFlags=VISIBLE mountUserId=0
state=CHECKING
fsType=vfat fsUuid=4552-4F43 fsLabel=
path=/storage/4552-4F43 internalPath=/mnt/media_rw/4552-4F43
2025-01-22 14:09:50.228 494-576 StorageSes...Controller system_process I Creating and starting session with id: public:179,1
2025-01-22 14:09:51.278 494-576 StorageManagerService system_process I Mounted volume VolumeInfo{public:179,1}:
type=PUBLIC diskId=disk:179,0 partGuid= mountFlags=VISIBLE mountUserId=0
state=MOUNTED
fsType=vfat fsUuid=4552-4F43 fsLabel=
path=/storage/4552-4F43 internalPath=/mnt/media_rw/4552-4F43
2025-01-22 14:09:51.294 494-576 StorageSes...Controller system_process I Notifying volume state changed for session with id: public:179,1
2025-01-22 14:09:51.403 494-576 StorageSes...Controller system_process I Notifying volume state changed for session with id: public:179,1
2025-01-22 14:09:51.447 494-576 StorageManagerService system_process D Volume public:179,1 broadcasting mounted to UserHandle{0}
2025-01-22 14:09:51.451 494-576 StorageManagerService system_process D Volume public:179,1 broadcasting mounted to UserHandle{0}
TF卡拔出日志
2025-01-22 14:13:26.174 494-576 StorageSes...Controller system_process I Notifying volume state changed for session with id: public:179,1
2025-01-22 14:13:26.210 494-576 StorageManagerService system_process D Volume public:179,1 broadcasting ejecting to UserHandle{0}
2025-01-22 14:13:26.720 494-576 StorageSes...Controller system_process I Notifying volume state changed for session with id: public:179,1
2025-01-22 14:13:26.721 494-864 StorageSes...Controller system_process I On volume remove VolumeInfo{public:179,1}:
type=PUBLIC diskId=disk:179,0 partGuid= mountFlags=VISIBLE mountUserId=0
state=BAD_REMOVAL
fsType=vfat fsUuid=4552-4F43 fsLabel=
path=/storage/4552-4F43 internalPath=/mnt/media_rw/4552-4F43
2025-01-22 14:13:26.730 494-864 StorageSes...Controller system_process I Removed session for vol with id: public:179,1
2025-01-22 14:13:26.745 494-576 StorageSes...Controller system_process I Notifying volume state changed for session with id: public:179,1
2025-01-22 14:13:26.746 494-576 StorageUserConnection system_process I No session found for sessionId: public:179,1
2025-01-22 14:13:26.748 494-576 StorageManagerService system_process D Volume public:179,1 broadcasting bad_removal to UserHandle{0}
vold
TF卡插入日志
01-22 14:16:17.329 170 186 D vold : /system/bin/sgdisk
01-22 14:16:17.329 170 186 D vold : --android-dump
01-22 14:16:17.329 170 186 D vold : /dev/block/vold/disk:179,0
01-22 14:16:17.357 170 186 D vold : DISK mbr
01-22 14:16:17.357 170 186 D vold : PART 1 b
01-22 14:16:17.363 170 1260 D vold : /system/bin/blkid
01-22 14:16:17.363 170 1260 D vold : -c
01-22 14:16:17.363 170 1260 D vold : /dev/null
01-22 14:16:17.363 170 1260 D vold : -s
01-22 14:16:17.363 170 1260 D vold : TYPE
01-22 14:16:17.364 170 1260 D vold : -s
01-22 14:16:17.364 170 1260 D vold : UUID
01-22 14:16:17.364 170 1260 D vold : -s
01-22 14:16:17.364 170 1260 D vold : LABEL
01-22 14:16:17.364 170 1260 D vold : /dev/block/vold/public:179,1
01-22 14:16:17.661 170 1260 D vold : /dev/block/vold/public:179,1: UUID="4552-4F43" TYPE="vfat"
01-22 14:16:17.665 170 1260 D vold : /system/bin/fsck_msdos
01-22 14:16:17.665 170 1260 D vold : -p
01-22 14:16:17.665 170 1260 D vold : -f
01-22 14:16:17.665 170 1260 D vold : -y
01-22 14:16:17.665 170 1260 D vold : /dev/block/vold/public:179,1
01-22 14:16:17.950 170 1260 D vold : /dev/block/vold/public:179,1: 71 files, 5554432 KiB free (173576 clusters)
01-22 14:16:17.954 170 1260 I vold : Filesystem check completed OK
01-22 14:16:17.972 170 1260 I vold : Mounting public fuse volume
01-22 14:16:17.980 170 1260 I vold : Bind mounting /mnt/media_rw/4552-4F43 to /mnt/pass_through/0/4552-4F43
01-22 14:16:19.029 170 1260 I vold : Configuring read_ahead of /mnt/user/0/4552-4F43 fuse filesystem to 256kb
01-22 14:16:19.031 170 1260 I vold : Writing 256 to /sys/class/bdi/0:65/read_ahead_kb
01-22 14:16:19.031 170 1260 I vold : Configuring max_ratio of /mnt/user/0/4552-4F43 fuse filesystem to 40
01-22 14:16:19.032 170 1260 I vold : Writing 40 to /sys/class/bdi/0:65/max_ratio
TF卡拔出日志
01-22 14:18:01.848 170 186 I vold : Unmounting pass_through_path /mnt/pass_through/0/4552-4F43
01-22 14:18:01.866 170 186 I vold : Unmounting fuse path /mnt/user/0/4552-4F43
内核日志
// TF卡插入
[ 1000.053504] mmc_host mmc0: Bus speed (slot 0) = 375000Hz (slot req 400000Hz, actual 375000HZ div = 0)
[ 1000.366490] mmc_host mmc0: Bus speed (slot 0) = 50000000Hz (slot req 50000000Hz, actual 50000000HZ div = 0)
[ 1000.366720] mmc0: new high speed SDHC card at address 0001
[ 1000.372287] mmcblk0: mmc0:0001 5.31 GiB
[ 1000.375717] mmcblk0: p1
// TF卡拔出
[ 1001.015799] FAT-fs (mmcblk0p1): Volume was not properly unmounted. Some data may be corrupt. Please run fsck.
[ 1104.367364] mmc0: card 0001 removed
电信量子加密TF卡SDK初始化失败问题
问题原因：android 11 强制分区存储和fuse文件系统cache模式导致
修改方案：APP 申请系统权限android.permission.MANAGE_EXTERNAL_STORAGE 和 android.permission.WRITE_MEDIA_STORAGE, fuse 文件系统修改为direct_io模式
fuse 文件系统direct_io 和 keep_cache模式对比
| 特性 | direct_io |
keep_cache |
|---|---|---|
| 缓存使用 | 不使用内核缓存，直接访问底层存储 | 使用内核缓存进行读写操作 |
| 数据一致性 | 数据一致性强，实时反映底层存储的更改 | 数据一致性较弱，可能存在缓存与底层数据不同步问题 |
| 性能 | 较低（直接与存储设备交互） | 较高（减少底层存储访问） |
| 适用场景 | 实时数据访问，高一致性需求 | 高性能需求，低一致性要求 |
| 内存使用 | 内存占用较低（无缓存） | 内存占用较高（依赖缓存） |
| 底层存储压力 | 压力较大（每次操作直接访问存储设备） | 压力较小（大部分操作通过缓存完成） |
| 文件访问方式 | 强制直接访问存储，跳过文件缓存 | 使用文件缓存，读写更高效 |
| 典型场景 | 数据库、日志文件、实时写入场景 | 媒体播放、静态文件访问、频繁读写的小文件 |
