Worked on the geerlingguy/linux repository to address performance bottlenecks in Direct I/O handling for pinned files within the f2fs file system. Focused on kernel development using C, the work involved implementing a targeted bug fix that optimized the read iterator by avoiding unnecessary blocking on inflight Direct I/O write completions for pinned files. This change reduced I/O wait times and delivered more predictable throughput for workloads relying on pinned files. The approach emphasized maintenance and performance validation rather than new feature development, with clear documentation and commit-level traceability to ensure the improvements were measurable and aligned with repository standards.