android: vold: Support to ignore boot device

Signed-off-by: hmz007 <hmz007@gmail.com>

system/vold/VolumeManager.cpp

@@ -44,6 +44,7 @@
 #include <async_safe/log.h>
 
 #include <cutils/fs.h>
+#include <cutils/properties.h>
 #include <utils/Trace.h>
 
 #include <selinux/android.h>
@@ -212,6 +213,14 @@ void VolumeManager::handleBlockEvent(NetlinkEvent* evt) {
 
     if (devType != "disk") return;
 
+    char boot_devices[PROPERTY_VALUE_MAX];
+    property_get("ro.boot.boot_devices", boot_devices, "");
+    if (strlen(boot_devices) > 0 &&
+        eventPath.find(boot_devices) != std::string::npos) {
+        LOG(DEBUG) << "ignore boot device " << boot_devices;
+        return;
+    }
+
     int major = std::stoi(evt->findParam("MAJOR"));
     int minor = std::stoi(evt->findParam("MINOR"));
     dev_t device = makedev(major, minor);