Android userData分区大小查看

首先，可以用个命令 cat /proc/partitions 查看分区大小如下所示：（单位KBytes）

cat /proc/partitions

major minor #blocks name

179 0 15388672 mmcblk0 179 1 1024 mmcblk0p1 179 2 1024 mmcblk0p2 179 3 10240 mmcblk0p3 179 4 2048 mmcblk0p4 179 5 8192 mmcblk0p5 179 6 8192 mmcblk0p6 179 7 20480 mmcblk0p7 259 0 20480 mmcblk0p8 259 1 40960 mmcblk0p9 259 2 40960 mmcblk0p10 259 3 40960 mmcblk0p11 259 4 20480 mmcblk0p12 259 5 1024 mmcblk0p13 259 6 307200 mmcblk0p14 259 7 40960 mmcblk0p15 259 8 819200 mmcblk0p16 259 9 819200 mmcblk0p17 259 10 13186048 mmcblk0p18 179 16 4096 mmcblk0boot1 179 8 4096 mmcblk0boot0

第一个mmcblk0为emmc的块设备，大小为15388672 KB。

其他的分区我们可以通过命令

ls -l /dev/block/platform/soc/by-name

lrwxrwxrwx root root 2019-03-13 16:38 baseparam -> /dev/block/mmcblk0p5 lrwxrwxrwx root root 2019-03-13 16:38 bootargs -> /dev/block/mmcblk0p2 lrwxrwxrwx root root 2019-03-13 16:38 cache -> /dev/block/mmcblk0p17 lrwxrwxrwx root root 2019-03-13 16:38 deviceinfo -> /dev/block/mmcblk0p4 lrwxrwxrwx root root 2019-03-13 16:38 fastboot -> /dev/block/mmcblk0p1 lrwxrwxrwx root root 2019-03-13 16:38 fastplay -> /dev/block/mmcblk0p9 lrwxrwxrwx root root 2019-03-13 16:38 fastplaybak -> /dev/block/mmcblk0p10 lrwxrwxrwx root root 2019-03-13 16:38 kernel -> /dev/block/mmcblk0p11 lrwxrwxrwx root root 2019-03-13 16:38 logo -> /dev/block/mmcblk0p7 lrwxrwxrwx root root 2019-03-13 16:38 logobak -> /dev/block/mmcblk0p8 lrwxrwxrwx root root 2019-03-13 16:38 misc -> /dev/block/mmcblk0p12 lrwxrwxrwx root root 2019-03-13 16:38 pqparam -> /dev/block/mmcblk0p6 lrwxrwxrwx root root 2019-03-13 16:38 qbboot -> /dev/block/mmcblk0p13 lrwxrwxrwx root root 2019-03-13 16:38 qbdata -> /dev/block/mmcblk0p14 lrwxrwxrwx root root 2019-03-13 16:38 recovery -> /dev/block/mmcblk0p3 lrwxrwxrwx root root 2019-03-13 16:38 system -> /dev/block/mmcblk0p16 lrwxrwxrwx root root 2019-03-13 16:38 trustedcore -> /dev/block/mmcblk0p15 lrwxrwxrwx root root 2019-03-13 16:38 userdata -> /dev/block/mmcblk0p18

我们可以找到 userdata -> /dev/block/mmcblk0p18 userdata分区被链接到了mmcblk0p18这个分区，再对应到第一条命令中我们可以查找到13186048 KB

在android中，device里面的BroadConfig.mk中可以修改userdata的大小，注意这里面的单位为字节

TARGET_USERIMAGES_USE_EXT4 := true
BOARD_SYSTEMIMAGE_PARTITION_SIZE := 838860800
BOARD_USERDATAIMAGE_PARTITION_SIZE := 13502513152
BOARD_CACHEIMAGE_PARTITION_SIZE := 838860800
BOARD_CACHEIMAGE_FILE_SYSTEM_TYPE := ext4
BOARD_FLASH_BLOCK_SIZE := 4096
BOARD_HAVE_BLUETOOTH := true