folio_inode(9)

💅 folio_inode(9) — like, the Kernel API Manual page you actually needed 🎀

okay so bestie, welcome to folio_inode(9) from the Kernel API Manual — this one's short, sweet, and honestly kind of a one-trick pony, but she does her trick flawlessly. ✨

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🌸 NAME 🌸

folio_inode — get the host inode for this folio. that's it. that's the whole vibe. 💫

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✨ SYNOPSIS ✨

struct inode * folio_inode (struct folio *folio );

like, you hand her a folio, she hands you back a struct inode *. iconic exchange, no notes. 🫶

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🦋 ARGUMENTS 🦋

• folio — the folio. yeah that's the whole description, she's lowkey self-explanatory. and yet... (see DESCRIPTION below 😭)

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💖 DESCRIPTION 💖

for folios that are chillin' in the page cache, this returns the inode that this folio belongs to. main character folio, meet her home inode. 🏠💅

⚠️ do NOT call this for folios that aren't in the page cache. like, fr fr, i'm not joking — this is the one rule and we do not break it. 🙈 not a vibe check she passes, okay?

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🎀 SEE ALSO 🎀

the whole friend group, gathered in Kernel file ./include/linux/pagemap.h — go say hi:

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

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okay that's the whole page, you ate that 💅 and rq the ~sign-off~ tea: this legend lives in ./include/linux, and she's dated October 2026. future icon behavior ngl. 🗓️👑 byeee, go read your pagemap 💜🧚🌸