commit bdeb86084dac52cbe44deba91ccc7cd8bc7f2b54
author Jeff Sharkey <jsharkey@android.com> Tue Dec 13 11:55:19 2016 -0700
committer Jeff Sharkey <jsharkey@android.com> Tue Dec 13 13:28:08 2016 -0700
tree 67d72459130fc9e23d08e553a2c07b9553db4771
parent 015ca93e1ae41d3d1f6ee7dffe3be847e56bb493

Define range of GIDs for cached app data.

To support upcoming disk usage calculation optimizations, this change
creates a new GID for each app that will be used to mark its cached
data.  We're allocating these unique GIDs so that we can use
quotactl() to track cached data on a per-app basis.

This change also tightens up the implementation of both the cache
and shared GID calculation to ensure that they stay inside the valid
ranges, and includes tests to verify.

Test: builds, boots, tests pass
Bug: 27948817
Change-Id: Ie4377e5aae267f2da39a165888139228995987cb

logd/LogStatistics.cpp

diff --git a/logd/LogStatistics.cpp b/logd/LogStatistics.cpp
index bab87ba..3c8bd75 100644
--- a/logd/LogStatistics.cpp
+++ b/logd/LogStatistics.cpp
@@ -182,7 +182,7 @@
     }
 
     // Parse /data/system/packages.list
-    uid_t userId = uid % AID_USER;
+    uid_t userId = uid % AID_USER_OFFSET;
     const char *name = android::uidToName(userId);
     if (!name && (userId > (AID_SHARED_GID_START - AID_APP))) {
         name = android::uidToName(userId - (AID_SHARED_GID_START - AID_APP));