STRUCT LIVEUPDATE_FILE_HANDLER(9)

🌸 STRUCT LIVEUPDATE_FILE_HANDLER(9) 🌸

okay bestie so this is a page from the Kernel API Manual — yes, that manual — all about struct liveupdate_file_handler, the little struct that's basically the ✨handler✨ for a type of file that can survive a live update. (the header up top is lowkey truncating it to struct liveu...file_handler(9), but we know her full name 💅)

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✨ NAME ✨

struct liveupdate_file_handler — the struct that represents a handler for a live-updatable file type. that's it, that's the whole name, she's literally that 🎀

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🦋 SYNOPSIS 🦋

struct liveupdate_file_handler {
    const struct liveupdate_file_ops *ops;
    const char compatible[LIVEUPDATE_HNDL_COMPAT_LENGTH];
 };

like… look at her. two fields. immaculate. no notes 💀

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💖 MEMBERS 💖

🌈 ops

The callback functions. that's the whole description, ngl — they're the callbacks, they do the callback things, the vibes are immaculate 🫶

🍓 compatible

The compatibility string (e.g. "memfd-v1", "vfiofd-v1") that uniquely identifies the file type this handler supports. she's the iconic one — this string gets matched against the compatible string that's associated with individual struct file instances. iykyk 👑

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🧚 DESCRIPTION 🧚

okay so listen 🔥 — modules that wanna support live update for specific file types should register an instance of this structure. that's the move. that's the assignment.

LUO uses this registration to figure out two things: whether a given file can be preserved (vibe check ✅) and which operations are the appropriate ones to manage its state across the update. main character energy for real, she's out here deciding fates 🌈⭐

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💜 SEE ALSO 💜

• Kernel file ./include/linux/liveupdate.h struct
• struct liveupdate_file_op_args(9)
• struct liveupdate_file_ops(9)
• struct liveupdate_flb_op_args(9)
• struct liveupdate_flb_ops(9)
• struct liveupdate_flb(9)

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and that's the page, bestie 💖 this whole thing lives down in ./include/linux, dated October 2026 — so like, future vibes, no cap. now go register your handler and slay ✨👑🎀