buffer_migrate_folio_norefs(9)

✨ buffer_migrate_folio_norefs ✨

okay so bestie, we're in the kernel API manual (section 9, the fancy kernel-doc one) and today's main character is buffer_migrate_folio_norefs — literally the migration function for folios with buffers 💅

---

💖 NAME 💖

buffer_migrate_folio_norefs — the migration function for folios that have buffers attached 🎀

---

🦋 SYNOPSIS 🦋

int buffer_migrate_folio_norefs (struct address_space *mapping , struct
folio *dst , struct folio *src , enum migrate_mode mode );

---

🌸 ARGUMENTS 🌸

• mapping — the address space that contains src ✨
• dst — the folio we're migrating to 🫶
• src — the folio we're migrating from 💫
• mode — how we're migrating the folio, iykyk 🌈

---

👑 DESCRIPTION 👑

So it's basically buffer_migrate_folio, except this variant is the careful one — it's more cautious and actually checks that there are also no buffer head references. No cap, that's the whole extra vibe check 🔥

This is the right function to reach for on mappings where buffer heads are directly looked up and referenced — block device mappings being the iconic example 👑

---

⭐ RETURN ⭐

0 on success, or a negative errno on failure 😭

---

🧚 SEE ALSO 🧚

Kernel file ./mm/migrate.c:

• isolate_movable_ops_page(9)
• putback_movable_ops_page(9)
• migrate_movable_ops_page(9)
• migrate_folio(9)
• buffer_migrate_folio(9)

---

and that's the whole page, bestie 🫶 this one lives over in ./mm and it's dated October 2026 — go forth and migrate those folios safely 💜🎀