Implement volume unmounting, collecting VFS volume info, usb Add eject command

include/syscall_defs.h

@@ -39,5 +39,7 @@
 #define SYS_STREAM_READ   36
 #define SYS_GET_PROC_INFO 37
 #define SYS_GET_DEVICE_INFO 38
+#define SYS_GET_VOLUME_INFO 39
+#define SYS_VOLUME_DELETE 40
 
 #endif // _M_SYSCALL_DEFS_H

include/volume_info.h

@@ -0,0 +1,11 @@
+#ifndef _VOLUME_INFO_H
+#define _VOLUME_INFO_H
+
+#include <path_defs.h>
+
+struct volume_info {
+  char volume_name[VOLUME_MAX];
+  char device_key[0x100];
+};
+
+#endif // _VOLUME_INFO_H