vold: switch f2fs gc_urgent_high to gc_urgent_mid

We need to reduce F2FS GC intensity for smart idle maintenance service
not to interfere with other I/O activities.

Test: check smart idle maintenance log every hour
Bug: 202283480
Bug: 181079477
Signed-off-by: Daeho Jeong <daehojeong@google.com>
Change-Id: Ideb1641a1539a23828bc8b00d9739c8128a984c0
diff --git a/IdleMaint.cpp b/IdleMaint.cpp
index 769d7a5..2fc0d4b 100644
--- a/IdleMaint.cpp
+++ b/IdleMaint.cpp
@@ -89,7 +89,7 @@
 static const int MIN_GC_URGENT_SLEEP_TIME = 500;
 static const int ONE_HOUR_IN_MS = 3600000;
 static const int GC_NORMAL_MODE = 0;
-static const int GC_URGENT_HIGH_MODE = 1;
+static const int GC_URGENT_MID_MODE = 3;
 
 static int32_t previousSegmentWrite = 0;
 
@@ -596,7 +596,7 @@
         return;
     }
 
-    if (!WriteStringToFile(std::to_string(GC_URGENT_HIGH_MODE), gcUrgentModePath)) {
+    if (!WriteStringToFile(std::to_string(GC_URGENT_MID_MODE), gcUrgentModePath)) {
         PLOG(WARNING) << "Writing failed in " << gcUrgentModePath;
         return;
     }