readahead_length(9)

💅 NAME 💅

Okay so we're in the Kernel API Manual, and today's main character is readahead_length(9). ✨ readahead_length - The number of bytes in this readahead request. That's the whole vibe, bestie: it gives you the byte count for the readahead request you're looking at. No cap. 💖

✨ SYNOPSIS ✨

Here's the signature, and yes, copy it exactly — we do not freestyle the types:

size_t readahead_length (const struct readahead_control *rac );

🎀 ARGUMENTS 🎀

• rac — The readahead request. That's the pointer you hand over, and it's literally the thing this function is checking out. 🦋

🔥 SEE ALSO 🔥

Kernel file ./include/linux/pagemap.h is the home base, and these are the linked besties — every single one, periodt:

• 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_folio(9)
• readahead_pos(9)
• readahead_index(9)
• readahead_count(9)
• readahead_batch_length(9)
• folio_mkwrite_check_truncate(9)
• i_blocks_per_folio(9)

This page's source/version is ./include/linux, dated October 2026 — mwah, stay hydrated, and may your readahead requests always eat 💅💖