tree 3b6d7e78bd8d53aeaf12825a24bf27fe8d962d32
parent 134aa097b9106e63e1622389fbb0d5543bd3d558
author Bertrand SIMONNET <bsimonnet@google.com> 1442953765 -0700
committer Bertrand SIMONNET <bsimonnet@google.com> 1442956398 -0700

rootdev: Don't try to access /dev/block.

When the device used to back a path is found in /sys/block, rootdev will
double check that /dev/block/<device name> exists and that the dev_t
matches the one in /sys/block/.
On Android, the manufacturer can add an SELinux context for that device
node which will prevent core daemons from accessing it, failing the call
to rootdev.

To avoid this, rootdev should return the device node path without trying
to access it.

This CL also enable building with Clang to ensure we use the strictest
compiler possible.

BUG: 24143423
BUG: 24267261
TEST: metricsd starts and find the main disk without any SELinux denial.
TEST: builds with clang and -Werror.

Change-Id: Icfe64695c28277d4c8eb9c89de1e13a767a703b8