From c4e30c3029885c54707841496a28e779e0eb3508 Mon Sep 17 00:00:00 2001
From: apio <blobs.trading@gmail.com>
Date: Thu, 27 Jul 2023 16:36:36 +0200
Subject: [PATCH] kernel: Add functionality to allow external inodes (such as
 sockets) to acquire an inode number from a file system

This is only implemented in tmpfs.
---
 kernel/src/fs/VFS.h                | 5 +++++
 kernel/src/fs/tmpfs/FileSystem.cpp | 5 +++++
 kernel/src/fs/tmpfs/FileSystem.h   | 2 ++
 3 files changed, 12 insertions(+)

diff --git a/kernel/src/fs/VFS.h b/kernel/src/fs/VFS.h
index 3dc369fb..b38dc171 100644
--- a/kernel/src/fs/VFS.h
+++ b/kernel/src/fs/VFS.h
@@ -35,6 +35,11 @@ namespace VFS
 
         virtual Result<SharedPtr<Inode>> create_symlink_inode(StringView link) = 0;
 
+        virtual Result<u64> allocate_inode_number()
+        {
+            return err(ENOTSUP);
+        }
+
         virtual Result<void> set_mount_dir(SharedPtr<Inode> parent) = 0;
 
         virtual Result<void> reset_mount_dir() = 0;
diff --git a/kernel/src/fs/tmpfs/FileSystem.cpp b/kernel/src/fs/tmpfs/FileSystem.cpp
index e871e2b5..71d0488c 100644
--- a/kernel/src/fs/tmpfs/FileSystem.cpp
+++ b/kernel/src/fs/tmpfs/FileSystem.cpp
@@ -16,6 +16,11 @@ namespace TmpFS
         return (SharedPtr<VFS::FileSystem>)fs;
     }
 
+    Result<u64> FileSystem::allocate_inode_number()
+    {
+        return m_next_inode_number++;
+    }
+
     Result<SharedPtr<VFS::Inode>> FileSystem::create_file_inode()
     {
         SharedPtr<FileInode> inode = TRY(make_shared<FileInode>());
diff --git a/kernel/src/fs/tmpfs/FileSystem.h b/kernel/src/fs/tmpfs/FileSystem.h
index 2542c740..2d598a9c 100644
--- a/kernel/src/fs/tmpfs/FileSystem.h
+++ b/kernel/src/fs/tmpfs/FileSystem.h
@@ -18,6 +18,8 @@ namespace TmpFS
         Result<SharedPtr<VFS::Inode>> create_device_inode(u32 major, u32 minor) override;
         Result<SharedPtr<VFS::Inode>> create_symlink_inode(StringView link) override;
 
+        Result<u64> allocate_inode_number() override;
+
         Result<void> set_mount_dir(SharedPtr<VFS::Inode> parent) override;
 
         Result<void> reset_mount_dir() override;