folio_attach_private(9)

💖 NAME 💖

okay so welcome to the folio_attach_private(9) page in the Kernel API Manual, bestie! The name is literally folio_attach_private — attach private data to a folio. Slay.

✨ SYNOPSIS ✨

void folio_attach_private (struct folio *folio , void *data );

That's the whole signature, no cap ✨

🎀 ARGUMENTS 🎀

• folio — the folio you're attaching data to.
• data — the data you're attaching to folio.

🦋 DESCRIPTION 🦋

So here's the tea, bestie: attaching private data to a folio increments the page's reference count. And the data must be detached before the folio will be freed — like, that's the rule, periodt. 💅

🌈 SEE ALSO 🌈

Kernel file: ./include/linux/pagemap.h — here's the full iconic lineup:

• 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_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_length(9)
• readahead_index(9)
• readahead_count(9)
• readahead_batch_length(9)
• folio_mkwrite_check_truncate(9)
• i_blocks_per_folio(9)

mwah 💋 — source/version: ./include/linux, date: October 2026.