STRUCT MEMFD_LUO_SER(9)

🌸 struct memfd_luo_ser(9) — the it-girl of kernel API manuals ✨

okay so bestie, welcome to the Kernel API Manual, and lemme tell you, this page is about the main character of memfd serialization. no cap, this struct is the moment. 💅

---

💖 NAME

struct memfd_luo_ser — the main serialization structure for a memfd. like, the whole vibe of the thing, packaged up. 🫶

---

✨ SYNOPSIS

struct memfd_luo_ser {
    u64 pos;
    u64 size;
    u32 seals;
    u32 flags;
    u64 nr_folios;
    struct kho_vmalloc folios;
 };

literally just vibes and fields. slay. 🎀

---

👑 Members

• pos — the file's current position, aka f_pos. yes, where you're at. main character positioning. ⭐
• size — the total size of the file in bytes, aka i_size. it's giving "how big is this thing." 🔥
• seals — the seals present on the memfd. important note bestie: the seals are uABI, so it is safe to directly use them in the ABI. no extra steps, we love that. 💖
• flags — flags for the file. ⚠️ and listen: unused flag bits must be set to 0. not optional, not a suggestion, fr fr. 🫡
• nr_folios — number of folios in the folios array. the count. the headcount. the roster size. 🌈
• folios — a KHO vmalloc descriptor pointing to the array of struct memfd_luo_folio_ser. it's pointing at its little friends. 🦋

---

🦋 SEE ALSO

• Kernel file ./include/linux/kho/abi/memfd.h
• memfd Live Update ABI(9)
• MEMFD_LUO_FOLIO_DIRTY(9)
• MEMFD_LUO_FOLIO_UPTODATE(9)
• struct memfd_luo_folio_ser(9)

go read those next, iykyk. 📚

---

ngl, if you skipped the bit about setting unused flag bits to 0, go back up there and reread it. i'm not mad, i'm just disappointed. 😭

---

and that's the page bestie!! 🧚💜 this iconic little drop came to you from ./include/linux/kho/abi, dated October 2026 — yes, she's from the future, and yes, she ate. periodt. 💅✨👑