Gadget inactivity timeout

MountPoints being inactive for time defined by InactivityTimeout will be unmounted.
Inacitivity is measured based on USB gadget R/W statitics.
InactivityTimeout must be set in json configuration and is common for all MountPoints.
Remaining time to unmount inactive media is exposed per MountPoint on dbus using RemainingInactivityTimeout property.

Change-Id: Ieb80e67dae6c3b4cb0482d801b5b4208884b0809
Signed-off-by: Agata Olender <agata.olender@intel.com>

1 files changed, 17 insertions, 0 deletions

diff --git a/src/system.hpp b/src/system.hpp
index ca9d17e..ae8a486 100644
--- a/src/system.hpp
+++ b/src/system.hpp
@@ -582,4 +582,21 @@ struct UsbGadget
         }
         return -1;
     }
+
+    static std::optional<std::string> getStats(const std::string& name)
+    {
+        const fs::path statsPath =
+            "/sys/kernel/config/usb_gadget/mass-storage-" + name +
+            "/functions/mass_storage.usb0/lun.0/stats";
+
+        std::ifstream ifs(statsPath);
+        if (!ifs.is_open())
+        {
+            LogMsg(Logger::Error, name, "Failed to open ", statsPath);
+            return {};
+        }
+
+        return std::string{std::istreambuf_iterator<char>(ifs),
+                           std::istreambuf_iterator<char>()};
+    }
 };