怎样将userdata区文件系统的f2fs换为Ext4呢

默认数据分区的文件系统为f2fs，建议不带电池的产品可以将数据分区的文件系统ext4改为，可以异常删除电后数据丢失的标识。方法如下：

device/rockchip/common$ git diff
diff --git a/scripts/fstab_tools/fstab.in b/scripts/fstab_tools/fstab.in
index 6e78b00..a658332 100755
--- a/scripts/fstab_tools/fstab.in
+++ b/scripts/fstab_tools/fstab.in
# For pcie ssd
/devices/platform/*.pcie* auto vfat defaults voldmanaged=pcie:auto

/dev/block/zram0                                none                swap      defaults                                              zramsize=50%
# For sdmmc
/devices/platform/${_sdmmc_device}/mmc_host*        auto  auto    defaults        voldmanaged=sdcard1:auto
#  Full disk encryption has less effect on rk3326, so default to enable this.
-/dev/block/by-name/userdata /data f2fs
noatime,nosuid,nodev,discard,reserve_root=32768,resgid=1065
latemount,wait,check,fileencryption=aes-256-xts:aes-256-
cts:v2+inlinecrypt_optimized,quota,formattable,reservedsize=128M,checkpoint=fs
+#/dev/block/by-name/userdata /data f2fs
noatime,nosuid,nodev,discard,reserve_root=32768,resgid=1065
latemount,wait,check,fileencryption=aes-256-xts:aes-256-
cts:v2+inlinecrypt_optimized,quota,formattable,reservedsize=128M,checkpoint=fs
# for ext4
-#/dev/block/by-name/userdata /data ext4
discard,noatime,nosuid,nodev,noauto_da_alloc,data=ordered,user_xattr,barrier=1
latemount,wait,formattable,check,fileencryption=software,quota,reservedsize=128M
,checkpoint=block
+/dev/block/by-name/userdata /data ext4
discard,noatime,nosuid,nodev,noauto_da_alloc,data=ordered,user_xattr,barrier=1
latemount,wait,formattable,check,fileencryption=software,quota,reservedsize=128M
,checkpoint=block


device/rockchip/rk356x$ git diff
diff --git a/rk3566_r/recovery.fstab b/rk3566_r/recovery.fstab
index 7532217..cf789ac 100755
--- a/rk3566_r/recovery.fstab
+++ b/rk3566_r/recovery.fstab
@@ -7,7 +7,7 @@
/dev/block/by-name/odm /odm ext4 defaults defaults
/dev/block/by-name/cache /cache ext4 defaults defaults
/dev/block/by-name/metadata /metadata ext4 defaults defaults
-/dev/block/by-name/userdata /data f2fs defaults defaults
+/dev/block/by-name/userdata /data ext4 defaults defaults
/dev/block/by-name/cust /cust ext4 defaults defaults
/dev/block/by-name/custom /custom ext4 defaults defaults
/dev/block/by-name/radical_update /radical_update ext4 defaults defaults