efi_loader: disk: add efi_disk_is_removable()
This helper function will be used to determine if the device is
removable media, initially for handling a short-path loading.
Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
diff --git a/lib/efi_loader/efi_disk.c b/lib/efi_loader/efi_disk.c
index f5b462f..1e82f52 100644
--- a/lib/efi_loader/efi_disk.c
+++ b/lib/efi_loader/efi_disk.c
@@ -73,6 +73,33 @@
return EFI_EXIT(EFI_SUCCESS);
}
+/**
+ * efi_disk_is_removable() - check if the device is removable media
+ * @handle: efi object handle;
+ *
+ * Examine the device and determine if the device is a local block device
+ * and removable media.
+ *
+ * Return: true if removable, false otherwise
+ */
+bool efi_disk_is_removable(efi_handle_t handle)
+{
+ struct efi_handler *handler;
+ struct efi_block_io *io;
+ efi_status_t ret;
+
+ ret = efi_search_protocol(handle, &efi_block_io_guid, &handler);
+ if (ret != EFI_SUCCESS)
+ return false;
+
+ io = handler->protocol_interface;
+
+ if (!io || !io->media)
+ return false;
+
+ return (bool)io->media->removable_media;
+}
+
enum efi_disk_direction {
EFI_DISK_READ,
EFI_DISK_WRITE,