dax_lock_folio(9)

🦋 dax_lock_folio(9) — Kernel API Manual 🦋

okay so bestie, this is the dax_lock_folio page from the Kernel API Manual, and it’s giving “tiny but important” energy. let’s get into it. 💖

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✨ NAME ✨

dax_lock_folio — Lock the DAX entry corresponding to a folio. slay, that’s the whole name section. 💅

💅 SYNOPSIS 💅

dax_entry_t dax_lock_folio (struct folio *folio );

that’s the signature, exactly as written. no edits, no “fixing” the spacing, no cap. 🫶

🎀 ARGUMENTS 🎀

• folio — The folio whose entry we want to lock. that’s the one, bestie. 🦋

🌸 CONTEXT 🌸

Process context. that’s it, that’s the context. ✨

🔥 RETURN 🔥

A cookie to pass to dax_unlock_folio, or 0 if the entry could not be locked. so yeah — cookie means you’re in business, 0 means that entry could not be locked. 😭

🌈 SEE ALSO 🌈

Kernel file ./fs/dax.c, plus the whole friend group:

• enum dax_wake_mode(9)
• dax_folio_reset_order(9)
• dax_layout_busy_page_range(9)
• dax_iomap_copy_around(9)
• dax_iomap_rw(9)
• dax_fault_iter(9)
• dax_iomap_fault(9)
• dax_finish_sync_fault(9)

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bye bestie 🫶 this page comes from ./fs, dated October 2026, and it’s all about dax_lock_folio(9) — periodt. 💖✨