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service/fs: Update file size on write
The file's size is stored in FileSessionSlot and retrieved when the game calls GetSize. However, it is not updated when the file is written to, which can possibly change the file size. Therefore, this can cause GetSize to return incorrect results.
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@ -90,7 +90,7 @@ void File::Write(Kernel::HLERequestContext& ctx) {
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IPC::RequestBuilder rb = rp.MakeBuilder(2, 2);
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IPC::RequestBuilder rb = rp.MakeBuilder(2, 2);
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const FileSessionSlot* file = GetSessionData(ctx.Session());
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FileSessionSlot* file = GetSessionData(ctx.Session());
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// Subfiles can not be written to
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// Subfiles can not be written to
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if (file->subfile) {
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if (file->subfile) {
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@ -103,6 +103,10 @@ void File::Write(Kernel::HLERequestContext& ctx) {
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std::vector<u8> data(length);
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std::vector<u8> data(length);
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buffer.Read(data.data(), 0, data.size());
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buffer.Read(data.data(), 0, data.size());
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ResultVal<std::size_t> written = backend->Write(offset, data.size(), flush != 0, data.data());
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ResultVal<std::size_t> written = backend->Write(offset, data.size(), flush != 0, data.data());
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// Update file size
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file->size = backend->GetSize();
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if (written.Failed()) {
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if (written.Failed()) {
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rb.Push(written.Code());
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rb.Push(written.Code());
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rb.Push<u32>(0);
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rb.Push<u32>(0);
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