fsp_srv: Implement GetSize and SetSize.

src/core/file_sys/disk_filesystem.cpp

@@ -174,8 +174,9 @@ u64 Disk_Storage::GetSize() const {
 }
 
 bool Disk_Storage::SetSize(const u64 size) const {
-    LOG_WARNING(Service_FS, "(STUBBED) called");
-    return false;
+    file->Resize(size);
+    file->Flush();
+    return true;
 }
 
 Disk_Directory::Disk_Directory(const std::string& path) : directory() {

src/core/hle/service/filesystem/fsp_srv.cpp

@@ -72,8 +72,8 @@ public:
     explicit IFile(std::unique_ptr<FileSys::StorageBackend>&& backend)
         : ServiceFramework("IFile"), backend(std::move(backend)) {
         static const FunctionInfo functions[] = {
-            {0, &IFile::Read, "Read"}, {1, &IFile::Write, "Write"}, {2, nullptr, "Flush"},
-            {3, nullptr, "SetSize"},   {4, nullptr, "GetSize"},
+            {0, &IFile::Read, "Read"},       {1, &IFile::Write, "Write"},     {2, nullptr, "Flush"},
+            {3, &IFile::SetSize, "SetSize"}, {4, &IFile::GetSize, "GetSize"},
         };
         RegisterHandlers(functions);
     }
@@ -150,6 +150,25 @@ private:
         IPC::ResponseBuilder rb{ctx, 2};
         rb.Push(RESULT_SUCCESS);
     }
+
+    void SetSize(Kernel::HLERequestContext& ctx) {
+        IPC::RequestParser rp{ctx};
+        const u64 size = rp.Pop<u64>();
+        backend->SetSize(size);
+        LOG_DEBUG(Service_FS, "called, size=0x%ld, length=0x%ld", size);
+
+        IPC::ResponseBuilder rb{ctx, 2};
+        rb.Push(RESULT_SUCCESS);
+    }
+
+    void GetSize(Kernel::HLERequestContext& ctx) {
+        const u64 size = backend->GetSize();
+        LOG_DEBUG(Service_FS, "called, size=0x%ld", size);
+
+        IPC::ResponseBuilder rb{ctx, 4};
+        rb.Push(RESULT_SUCCESS);
+        rb.Push<u64>(size);
+    }
 };
 
 class IDirectory final : public ServiceFramework<IDirectory> {