Claude review: trace: store i_ino as u64 instead of ino_t/unsigned long

[Claude Code Review Bot <claude-review@example.com>]

Patch Review

Massive but mechanical patch touching 13 trace header files. Every `__field(ino_t, ...)` and `__field(unsigned long, ino)` becomes `__field(u64, ...)`, with corresponding format string updates.

The removal of `(unsigned long)` casts in `TP_printk` is a nice cleanup. The `writeback.h` changes also update `__trace_wb_assign_cgroup()` and `__trace_wbc_assign_cgroup()` return types from `ino_t` to `u64`, which is correct since they return cgroup inode numbers.

**One subtlety**: The trace ring buffer format changes. Any existing `perf` or `trace-cmd` recordings that captured these events will have the old field sizes. Tools that parse raw trace data by field offsets (rather than format strings) could be affected. This is inherent to any trace field type change and is generally accepted practice, but it's worth being aware of.

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Generated by Claude Code Patch Reviewer