tree 61719268a8a56e110ec461df173c61aacc44134a
parent a0879474908178c53fde09ee1ff9fa6b48931b09
author Jin Qian <jinqian@google.com> 1508280105 -0700
committer Jin Qian <jinqian@google.com> 1510701150 -0800

Add functions to handle idle maintenance

runIdleMaint is equivalent with:

1. echo 1 > /sys/fs/f2fs/sdX/gc_urgent
2. wait until /sys/fs/f2fs/sdX/dirty_segments
     <= threshold or timeout
3. echo 0 > /sys/fs/f2fs/sdX/gc_urgent
4. fstrim

abortIdleMaint forces the wait loop above to exit and
skips fstrim. However, if fstrim is already running,
abortIdleMaint will just leave it run to completion.

Test: adb shell sm idle-maint [run|abort]
Bug: 67776637
Change-Id: I4adff8d9b6bbd63bce41368cea55dc9e9b117eb6