tree 52a68ca0172b97d75a6fbf248ffac01e83402330
parent afc7a78349160743b206ed89aed401c3d2d45761
author caozhiyuan <cao.zhiyuan@zte.com.cn> 1432027260 +0800
committer The Android Automerger <android-build@google.com> 1435352057 -0700

Use f_bavail to calculate free space

Failures are seen on devices with
Linux 3.10. And they are mainly due to this change:
https://lwn.net/Articles/546473/
The blocks reserved in this change is not the same thing as what we
think are reserved for common usage of root user. And this part is
included in free blocks but not in available blocks.

Bug: 22118089
Change-Id: I81c9531703298019a4fc11839f28d2cc8b9df34e
(cherry picked from commit 3b4977638f48e59d23d7ea2bb6dde78552c257fb)