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platform_system_core
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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: Jaegeuk Kim <jaegeuk@google.com>
Change-Id: I1b3768005fc8720694bace05292a1b1171d60e3c
This commit is contained in:
Jaegeuk Kim 2020-07-20 17:34:47 -07:00
parent 8d5bbec4c1
commit 43dca3c8be
1 changed files with 17 additions and 4 deletions
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21
rootdir/init.rc
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@ -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