I'd like to see more about block I/O stuff. Like bio, bio_set and so on ...

This issue has no description.

The issue is a request to expand the book's coverage of block I/O concepts like bio and bio_set. The repository is a book about the Linux kernel, so the work involves researching the kernel's block layer, understanding the relevant source files (likely in the kernel's block/ directory), and writing explanatory text. There is no specific guidance on scope, target files, or acceptance criteria.

Written by the indexing model from the issue text.