[Android-Frameworks] Implement the Internal Partition of Storage-优快云博客

本文探讨了Android系统中内部存储与SD卡的分区管理方式，包括如何通过Settings应用查看存储信息，以及不同存储区域如/data、/mnt/sdcard等的文件系统配置和使用情况。

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Implement Internal partition and SD-card Partition

PURPOSE: 查看Settings->Storage如何调用&显示storage分区信息

DATE : 20130117

FILE : BYD47/vendor/BYD/app/Settings/res/values/strings.xml

LINE : 2126

CONTEXT:

<string name="erase_external_storage" product ="default"> Erase Internal Storage</string>

<string name="erase_external_storage_description" product ="nosdcard"> Erase all the data on the internal USB storage, such as music or photos</ string>

<string name="erase_external_storage_description" product ="default"> Erases all data on the Internal Storage, such as music or photos</ string>

--------------------------------------------------------------------------

Search the "erase_external_storage" keyword, got the Settings source code

is: BYD 未公开settings source code

--------------------------------------------------------------------------

PURPOSE: Thinking..

COMMAND: adb shell

NOTE: 插入sdcard状况下，此时没有/mnt/sdcard_ext分区

# df

/data                    1G   119M   916M   4096
/mnt/asec              485M     0K   485M   4096
/mnt/obb               485M     0K   485M   4096
/factory                 7M     4M     3M   4096
/mnt/sdcard              1G     4M     1G   4096

/data -> volume object

COMMAND: cat /proc/mounts

#cat /proc/mounts

/dev/block/mmcblk0p8 /data ext4 rw,nosuid,nodev,noatime,user_xattr,barrier=1,dat
a=ordered,noauto_da_alloc 0 0

/dev/block/vold/179:7 /mnt/sdcard vfat rw,dirsync,nosuid,nodev,noexec,relatime,u
id=1000,gid=1015,fmask=0702,dmask=0702,allow_utime=0020,codepage=cp437,iocharset
=iso8859-1,shortname=mixed,utf8,errors=remount-ro 0 0

"block partition -> volumes", vold接收管理8支partition，其中:

partition 8对应着/data分区(FileSystem)，对应着Application Storage(AS)
partition 7对应着/sdcard分区(FileSystem)，对应着Internal Storage(AS)
partition 10,11对应着/sdcard_ext分区(FileSystem),未插入sdcard，故未显示之

DEVICE: XT920

COMMAND: df

shell@android:/ $ df
df
Filesystem             Size   Used   Free   Blksi
/dev                   488M    84K   488M   4096
/mnt/asec              488M     0K   488M   4096
/mnt/obb               488M     0K   488M   4096
/system                504M   384M   119M   4096
/data                    2G   838M     1G   4096
/cache                 293M     5M   288M   4096
/flex                  252M   173M    78M   4096
/misc/phone            252M   173M    78M   4096
/storage/sdcard0         2G   838M     1G   4096
/storage/sdcard1         7G     5G     2G   32768