lock_page(9)

💅 lock_page(9) — Kernel API Manual, bestie edition 💖

✨ NAME ✨

lock_page — lock the folio containing this page. That’s the whole vibe. 🎀

🦋 SYNOPSIS 🦋

void lock_page (struct page *page );

🎀 ARGUMENTS 🎀

• page — the page to lock. That’s it, that’s the assignment. 💅

💖 DESCRIPTION 💖

Okay so for the actual deets on what this lock protects, go read folio_lock — it has the lore. 📖

This one is a legacy function, bestie. It’s giving old-school 💀, and new code should probably use folio_lock instead. No cap. ✨

🦋 CONTEXT 🦋

It may sleep 😴 — so plan accordingly.

Pages in the same folio share a lock, so do not attempt to lock two pages which share a folio. That’s a no-no, fr fr. 🙅‍♀️

🌈 SEE ALSO 🌈

Kernel file ./include/linux/pagemap.h — and the whole squad is here:

• 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)
• 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)

🫶 cute sign-off: source/version is ./include/linux, the date is October 2026, and the manual name is lock_page(9). bye bestie, mwah 💋✨