am 81f55c6d: Mount emulated volumes as consistent location.

* commit '81f55c6dc1a14ed68e404fa3a2c244dd343e4990':
  Mount emulated volumes as consistent location.

Benchmark.cpp

@@ -28,6 +28,8 @@
 #include <sys/resource.h>
 #include <unistd.h>
 
+#define ENABLE_DROP_CACHES 1
+
 using android::base::ReadFileToString;
 using android::base::WriteStringToFile;
 
@@ -88,11 +90,13 @@ static nsecs_t benchmark(const std::string& path) {
     sync();
     nsecs_t create = systemTime(SYSTEM_TIME_BOOTTIME);
 
+#if ENABLE_DROP_CACHES
     LOG(VERBOSE) << "Before drop_caches";
     if (!WriteStringToFile("3", "/proc/sys/vm/drop_caches")) {
         PLOG(ERROR) << "Failed to drop_caches";
     }
     LOG(VERBOSE) << "After drop_caches";
+#endif
     nsecs_t drop = systemTime(SYSTEM_TIME_BOOTTIME);
 
     BenchmarkRun();

EmulatedVolume.cpp

@@ -54,12 +54,19 @@ EmulatedVolume::~EmulatedVolume() {
 }
 
 status_t EmulatedVolume::doMount() {
-    mFuseDefault = StringPrintf("/mnt/runtime_default/%s", mLabel.c_str());
-    mFuseRead = StringPrintf("/mnt/runtime_read/%s", mLabel.c_str());
-    mFuseWrite = StringPrintf("/mnt/runtime_write/%s", mLabel.c_str());
+    // We could have migrated storage to an adopted private volume, so always
+    // call primary storage "emulated" to avoid media rescans.
+    std::string label = mLabel;
+    if (getMountFlags() & MountFlags::kPrimary) {
+        label = "emulated";
+    }
+
+    mFuseDefault = StringPrintf("/mnt/runtime_default/%s", label.c_str());
+    mFuseRead = StringPrintf("/mnt/runtime_read/%s", label.c_str());
+    mFuseWrite = StringPrintf("/mnt/runtime_write/%s", label.c_str());
 
     setInternalPath(mRawPath);
-    setPath(StringPrintf("/storage/%s", mLabel.c_str()));
+    setPath(StringPrintf("/storage/%s", label.c_str()));
 
     if (fs_prepare_dir(mFuseDefault.c_str(), 0700, AID_ROOT, AID_ROOT) ||
             fs_prepare_dir(mFuseRead.c_str(), 0700, AID_ROOT, AID_ROOT) ||
@@ -77,7 +84,7 @@ status_t EmulatedVolume::doMount() {
                 "-m",
                 "-w",
                 mRawPath.c_str(),
-                mLabel.c_str(),
+                label.c_str(),
                 NULL)) {
             PLOG(ERROR) << "Failed to exec";
         }

PrivateVolume.cpp

@@ -159,6 +159,7 @@ status_t PrivateVolume::doMount() {
     if (PrepareDir(mPath + "/app", 0771, AID_SYSTEM, AID_SYSTEM) ||
             PrepareDir(mPath + "/user", 0711, AID_SYSTEM, AID_SYSTEM) ||
             PrepareDir(mPath + "/media", 0770, AID_MEDIA_RW, AID_MEDIA_RW) ||
+            PrepareDir(mPath + "/media/0", 0770, AID_MEDIA_RW, AID_MEDIA_RW) ||
             PrepareDir(mPath + "/local", 0751, AID_ROOT, AID_ROOT) ||
             PrepareDir(mPath + "/local/tmp", 0771, AID_SHELL, AID_SHELL)) {
         PLOG(ERROR) << getId() << " failed to prepare";