Android系统中添加了SSD存储, 如何触发vold server的挂载?

[生命中的小执念]

Android系统中添加了SSD存储, 如何触发vold server的挂载?

[weixin_38498942]

SSD存储的挂载, 可以通过修改 fstab的内容, 以高通8250平台为例子:
adb root
adb disable-verity
adb reboot

重启之后, 使用

adb pull /vendor/etc/fstab.qcom .

fstab的内容为

system                                                  /system                ext4    ro,barrier=1,discard                                 wait,slotselect,avb=vbmeta_system,logical,first_stage_mount,avb_keys=/avb/q-gsi.avbpubkey:/avb/r-gsi.avbpubkey:/avb/s-gsi.avbpubkey
product                                                 /product               ext4    ro,barrier=1,discard                                 wait,slotselect,avb=vbmeta_system,logical,first_stage_mount
vendor                                                  /vendor                ext4    ro,barrier=1,discard                                 wait,slotselect,avb,logical,first_stage_mount
odm                                                     /odm                   ext4    ro,barrier=1,discard                                 wait,slotselect,avb,logical,first_stage_mount
/dev/block/by-name/metadata                             /metadata              ext4    noatime,nosuid,nodev,discard                         wait,formattable,wrappedkey,first_stage_mount
/dev/block/bootdevice/by-name/userdata                  /data                  f2fs    noatime,nosuid,nodev,discard,reserve_root=32768,resgid=1065,fsync_mode=nobarrier    latemount,wait,check,formattable,fileencryption=ice,wrappedkey,keydirectory=/metadata/vold/metadata_encryption,quota,reservedsize=128M,checkpoint=fs
/dev/block/bootdevice/by-name/persist                   /mnt/vendor/persist    ext4    noatime,nosuid,nodev,barrier=1                       wait
/dev/block/bootdevice/by-name/misc                      /misc                  emmc    defaults                                             defaults
/devices/platform/soc/8804000.sdhci/mmc_host*           /storage/sdcard1       vfat    nosuid,nodev                                         wait,voldmanaged=sdcard1:auto,encryptable=footer
/devices/platform/soc/1da4000.ufshc_card/host*          /storage/sdcard1       vfat    nosuid,nodev                                         wait,voldmanaged=sdcard1:auto,encryptable=footer
/devices/platform/soc/*.ssusb/*.dwc3/xhci-hcd.*.auto*   /storage/usbotg        vfat    nosuid,nodev                                         wait,voldmanaged=usbotg:auto
/dev/block/bootdevice/by-name/spunvm                    /mnt/vendor/spunvm     vfat    rw,noatime,shortname=lower,uid=1000,gid=1000,dmask=007,fmask=007,context=u:object_r:spunvm_file:s0 wait
/dev/block/bootdevice/by-name/modem                     /vendor/firmware_mnt   vfat    ro,shortname=lower,uid=1000,gid=1000,dmask=227,fmask=337,context=u:object_r:firmware_file:s0 wait,slotselect
/dev/block/bootdevice/by-name/dsp                       /vendor/dsp            ext4    ro,nosuid,nodev,barrier=1                            wait,slotselect
/dev/block/bootdevice/by-name/bluetooth                 /vendor/bt_firmware    vfat    ro,shortname=lower,uid=1002,gid=3002,dmask=227,fmask=337,context=u:object_r:bt_firmware_file:s0 wait,slotselect

查找到SSD的驱动的位置, 以QCS8250为例子, 我们的ssd挂载在pcie1上, 找到pcie1的地址为

/sys/devices/platform/soc/1c08000.qcom,pcie

在这个基础上修改fstab为

system                                                  /system                ext4    ro,barrier=1,discard                                 wait,slotselect,avb=vbmeta_system,logical,first_stage_mount,avb_keys=/avb/q-gsi.avbpubkey:/avb/r-gsi.avbpubkey:/avb/s-gsi.avbpubkey
product                                                 /product               ext4    ro,barrier=1,discard                                 wait,slotselect,avb=vbmeta_system,logical,first_stage_mount
vendor                                                  /vendor                ext4    ro,barrier=1,discard                                 wait,slotselect,avb,logical,first_stage_mount
odm                                                     /odm                   ext4    ro,barrier=1,discard                                 wait,slotselect,avb,logical,first_stage_mount
/dev/block/by-name/metadata                             /metadata              ext4    noatime,nosuid,nodev,discard                         wait,formattable,wrappedkey,first_stage_mount
/dev/block/bootdevice/by-name/userdata                  /data                  f2fs    noatime,nosuid,nodev,discard,reserve_root=32768,resgid=1065,fsync_mode=nobarrier    latemount,wait,check,formattable,fileencryption=ice,wrappedkey,keydirectory=/metadata/vold/metadata_encryption,quota,reservedsize=128M,checkpoint=fs
/dev/block/bootdevice/by-name/persist                   /mnt/vendor/persist    ext4    noatime,nosuid,nodev,barrier=1                       wait
/dev/block/bootdevice/by-name/misc                      /misc                  emmc    defaults                                             defaults
/devices/platform/soc/8804000.sdhci/mmc_host*           /storage/sdcard1       vfat    nosuid,nodev                                         wait,voldmanaged=sdcard1:auto,encryptable=footer
/devices/platform/soc/1da4000.ufshc_card/host*          /storage/sdcard1       vfat    nosuid,nodev                                         wait,voldmanaged=sdcard1:auto,encryptable=footer
/devices/platform/soc/1c08000.qcom,pcie*                /storage/sdcard2       vfat    nosuid,nodev                                         wait,voldmanaged=sdcard2:auto,encryptable=footer
/devices/platform/soc/*.ssusb/*.dwc3/xhci-hcd.*.auto*   /storage/usbotg        vfat    nosuid,nodev                                         wait,voldmanaged=usbotg:auto
/dev/block/bootdevice/by-name/spunvm                    /mnt/vendor/spunvm     vfat    rw,noatime,shortname=lower,uid=1000,gid=1000,dmask=007,fmask=007,context=u:object_r:spunvm_file:s0 wait
/dev/block/bootdevice/by-name/modem                     /vendor/firmware_mnt   vfat    ro,shortname=lower,uid=1000,gid=1000,dmask=227,fmask=337,context=u:object_r:firmware_file:s0 wait,slotselect
/dev/block/bootdevice/by-name/dsp                       /vendor/dsp            ext4    ro,nosuid,nodev,barrier=1                            wait,slotselect
/dev/block/bootdevice/by-name/bluetooth                 /vendor/bt_firmware    vfat    ro,shortname=lower,uid=1002,gid=3002,dmask=227,fmask=337,context=u:object_r:bt_firmware_file:s0 wait,slotselect

然后运行命令将fstab放回原来的地方

adb root
adb remount
adb push fstab.qcom  /vendor/etc/fstab.qcom
adb reboot

之后vold就可以检测到这个ssd设备并且可以进行挂载.