+/**\r
+ The routine issues dummy read for every physical block device to cause\r
+ the BlockIo re-installed if media change happened.\r
+**/\r
+VOID\r
+ProbeForMediaChange (\r
+ VOID\r
+ )\r
+{\r
+ EFI_STATUS Status;\r
+ UINTN HandleCount;\r
+ EFI_HANDLE *Handles;\r
+ EFI_BLOCK_IO_PROTOCOL *BlockIo;\r
+ UINTN Index;\r
+\r
+ gBS->LocateHandleBuffer (\r
+ ByProtocol,\r
+ &gEfiBlockIoProtocolGuid,\r
+ NULL,\r
+ &HandleCount,\r
+ &Handles\r
+ );\r
+ //\r
+ // Probe for media change for every physical block io\r
+ //\r
+ for (Index = 0; Index < HandleCount; Index++) {\r
+ Status = gBS->HandleProtocol (\r
+ Handles[Index],\r
+ &gEfiBlockIoProtocolGuid,\r
+ (VOID **) &BlockIo\r
+ );\r
+ if (!EFI_ERROR (Status)) {\r
+ if (!BlockIo->Media->LogicalPartition) {\r
+ //\r
+ // Per spec:\r
+ // The function (ReadBlocks) must return EFI_NO_MEDIA or\r
+ // EFI_MEDIA_CHANGED even if LBA, BufferSize, or Buffer are invalid so the caller can probe\r
+ // for changes in media state.\r
+ //\r
+ BlockIo->ReadBlocks (\r
+ BlockIo,\r
+ BlockIo->Media->MediaId,\r
+ 0,\r
+ 0,\r
+ NULL\r
+ );\r
+ }\r
+ }\r
+ }\r
+}\r
+\r