From 3393b786238b43ac1faef20fb393d4efd3d8ce3c Mon Sep 17 00:00:00 2001
From: Sergey Bugaev <bugaevc@gmail.com>
Date: Sun, 12 Jan 2020 18:28:23 +0300
Subject: [PATCH] Kernel: Allow getting a Device from a FileDescription

Like we already do for other kinds of files.
---
 Kernel/FileSystem/FileDescription.cpp | 14 ++++++++++++++
 Kernel/FileSystem/FileDescription.h   |  2 ++
 2 files changed, 16 insertions(+)

diff --git a/Kernel/FileSystem/FileDescription.cpp b/Kernel/FileSystem/FileDescription.cpp
index 13c3850ffd..ad7be299f7 100644
--- a/Kernel/FileSystem/FileDescription.cpp
+++ b/Kernel/FileSystem/FileDescription.cpp
@@ -172,6 +172,20 @@ bool FileDescription::is_device() const
     return m_file->is_device();
 }
 
+const Device* FileDescription::device() const
+{
+    if (!is_device())
+        return nullptr;
+    return static_cast<const Device*>(m_file.ptr());
+}
+
+Device* FileDescription::device()
+{
+    if (!is_device())
+        return nullptr;
+    return static_cast<Device*>(m_file.ptr());
+}
+
 bool FileDescription::is_tty() const
 {
     return m_file->is_tty();
diff --git a/Kernel/FileSystem/FileDescription.h b/Kernel/FileSystem/FileDescription.h
index 8d7f5b499a..d56d8f3619 100644
--- a/Kernel/FileSystem/FileDescription.h
+++ b/Kernel/FileSystem/FileDescription.h
@@ -71,6 +71,8 @@ public:
     const File& file() const { return *m_file; }
 
     bool is_device() const;
+    const Device* device() const;
+    Device* device();
 
     bool is_tty() const;
     const TTY* tty() const;