readahead_folio(9)

🌸 NAME 🌸

okay so bestie, this is readahead_folio(9) from the Kernel API Manual, and it's literally here to Get the next folio to read. That's the whole assignment. 💅✨

✨ SYNOPSIS ✨

struct folio * readahead_folio (struct readahead_control *ractl );

🎀 ARGUMENTS 🎀

• ractl — the current readahead request, no cap. That's the one and only argument, bestie. 🫶

🔒 CONTEXT 🔒

vibe check: the folio is locked. The caller should unlock the folio once all I/O to that folio has completed. please don't forget this step, okay? 😭💖

💖 RETURN 💖

A pointer to the next folio — slay — or NULL if we are done. That's it. 🌈⭐

👀 SEE ALSO 👀

the whole entourage, fr fr — go peek at these:

• Kernel file ./include/linux/pagemap.h
• filemap_set_wb_err(9)
• filemap_check_wb_err(9)
• filemap_sample_wb_err(9)
• file_sample_sb_err(9)
• mapping_set_error(9)
• mapping_set_large_folios(9)
• mapping_align_index(9)
• mapping_pmd_folio_support(9)
• folio_flush_mapping(9)
• folio_inode(9)
• folio_attach_private(9)
• folio_change_private(9)
• folio_detach_private(9)
• fgf_t(9)
• fgf_set_order(9)
• write_begin_get_folio(9)
• filemap_get_folio(9)
• filemap_lock_folio(9)
• filemap_grab_folio(9)
• find_get_page(9)
• find_lock_page(9)
• find_or_create_page(9)
• grab_cache_page_nowait(9)
• folio_next_index(9)
• folio_next_pos(9)
• folio_file_page(9)
• folio_contains(9)
• page_pgoff(9)
• folio_pos(9)
• linear_page_delta(9)
• linear_page_index(9)
• linear_anon_page_index(9)
• folio_trylock(9)
• folio_lock(9)
• lock_page(9)
• folio_lock_killable(9)
• filemap_range_needs_writeback(9)
• struct readahead_control(9)
• page_cache_sync_readahead(9)
• page_cache_async_readahead(9)
• readahead_pos(9)
• readahead_length(9)
• readahead_index(9)
• readahead_count(9)
• readahead_batch_length(9)
• folio_mkwrite_check_truncate(9)
• i_blocks_per_folio(9)

byeeee 💋 source/version: ./include/linux · date: October 2026 · page: readahead_folio(9) — mwah, love u bestie 🫶💖