Consistent "low storage" behavior.
When answering the question "how much space is free", use the same
logic for Settings UI and StorageManager.getAllocatableBytes(). That
is, the reported free space is usable bytes plus any cached data the
system is willing to delete automatically.
This does *not* include any reserved cache space, since we don't want
abusive apps to penalize other well-behaved apps that are storing
their data in cache locations. Callers freeing cached data need to
now explicitly request defiance of the reserved cache space. (Most
callers are already doing this by using FLAG_ALLOCATE_AGGRESSIVE.)
Rewrite the core logic of DeviceStorageMonitorService to understand
this new "reserved" cache space, and to be easier to understand. It
also now handles cached data on adopted storage volumes, which had
been ignored until now. Also fix bug where we had skipped "low"
broadcasts when the device skipped directly from/to "full" state.
Bug: 38008706
Test: cts-tradefed run commandAndExit cts-dev -m CtsJobSchedulerTestCases -t android.jobscheduler.cts.StorageConstraintTest
Test: cts-tradefed run commandAndExit cts-dev -m CtsAppSecurityHostTestCases -t android.appsecurity.cts.StorageHostTest
Change-Id: Icbdcf3b52775f7ada1ceaeff2f96094c8d8052f9
diff --git a/services/core/java/com/android/server/EventLogTags.logtags b/services/core/java/com/android/server/EventLogTags.logtags
index 6502c01..68f8c1b 100644
--- a/services/core/java/com/android/server/EventLogTags.logtags
+++ b/services/core/java/com/android/server/EventLogTags.logtags
@@ -41,14 +41,10 @@
# ---------------------------
# DeviceStorageMonitorService.java
# ---------------------------
-# The disk space free on the /data partition, in bytes
-2744 free_storage_changed (data|2|2)
-# Device low memory notification and disk space free on the /data partition, in bytes at that time
-2745 low_storage (data|2|2)
-# disk space free on the /data, /system, and /cache partitions in bytes
-2746 free_storage_left (data|2|2),(system|2|2),(cache|2|2)
-# file on cache partition was deleted
+# File on cache partition was deleted
2748 cache_file_deleted (path|3)
+# Storage volume state and usable space in bytes
+2749 storage_state (uuid|3),(old_state|1),(new_state|1),(usable|2),(total|2)
# ---------------------------