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Commit 43dca3c8 authored by Jaegeuk Kim's avatar Jaegeuk Kim
Browse files

add generic symlink to access userdata sysfs 



This patch adds fixed location to access sysfs entries by introducing:
/dev/sys/fs/by-name/userdata -> /sys/fs/f2fs/dm-<num>
/dev/sys/block/by-name/userdata -> /sys/block/dm-<num>

Bug: 144277579
Signed-off-by: default avatarJaegeuk Kim <jaegeuk@google.com>
Change-Id: I1b3768005fc8720694bace05292a1b1171d60e3c
parent 8d5bbec4

rootdir/init.rc

+17 −4
Original line number Diff line number Diff line
@@ -81,6 +81,11 @@ on early-init 
    # Mount tracefs

    mount tracefs tracefs /sys/kernel/tracing



    # create sys dirctory

    mkdir /dev/sys 0755 system system

    mkdir /dev/sys/fs 0755 system system

    mkdir /dev/sys/block 0755 system system



# Run boringssl self test for each ABI so that later processes can skip it. http://b/139348610

on early-init && property:ro.product.cpu.abilist32=*

    exec_start boringssl_self_test32
@@ -867,18 +872,26 @@ on boot 
    chown root system /sys/block/zram0/writeback

    chmod 0664 /sys/block/zram0/writeback



    # to access F2FS sysfs on dm-<num> directly

    mkdir /dev/sys/fs/by-name 0755 system system

    symlink /sys/fs/f2fs/${dev.mnt.blk.data} /dev/sys/fs/by-name/userdata



    # to access dm-<num> sysfs

    mkdir /dev/sys/block/by-name 0755 system system

    symlink /sys/devices/virtual/block/${dev.mnt.blk.data} /dev/sys/block/by-name/userdata



    # F2FS tuning. Set cp_interval larger than dirty_expire_centisecs, 30 secs,

    # to avoid power consumption when system becomes mostly idle. Be careful

    # to make it too large, since it may bring userdata loss, if they

    # are not aware of using fsync()/sync() to prepare sudden power-cut.

    write /sys/fs/f2fs/${dev.mnt.blk.data}/cp_interval 200

    write /sys/fs/f2fs/${dev.mnt.blk.data}/gc_urgent_sleep_time 50

    write /sys/fs/f2fs/${dev.mnt.blk.data}/iostat_enable 1

    write /dev/sys/fs/by-name/userdata/cp_interval 200

    write /dev/sys/fs/by-name/userdata/gc_urgent_sleep_time 50

    write /dev/sys/fs/by-name/userdata/iostat_enable 1



    # limit discard size to 128MB in order to avoid long IO latency

    # for filesystem tuning first (dm or sda)

    # Note that, if dm-<num> is used, sda/mmcblk0 should be tuned in vendor/init.rc

    write /sys/devices/virtual/block/${dev.mnt.blk.data}/queue/discard_max_bytes 134217728

    write /dev/sys/block/by-name/userdata/queue/discard_max_bytes 134217728



    # Permissions for System Server and daemons.

    chown system system /sys/power/autosleep