STRUCT UBI_MAP_REQ(9)

✨ struct ubi_map_req(9) ✨

okay so bestie, welcome to the Kernel API Manual 💖 this one's a lil struct from the UBI world and it is literally the glow-up you need for map LEB requests. it's giving "small but mighty" 🧚

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🌸 NAME 🌸

struct ubi_map_req — a data structure used in map LEB requests 💅

like, that's the whole vibe. it's a request struct. for mapping. iconic behavior only 👑

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🦋 SYNOPSIS 🦋

struct ubi_map_req {
    __s32 lnum;
    __s8 dtype;
    __s8 padding[3];
 };

yes that's the whole thing, she's compact and she knows it 🎀 copy it exactly, no cap, the types are __s32 and __s8 and those little underscores are not decorative, they are the moment ✨

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🌈 Members 🌈

okay bestie let's meet the cast 🫶

• lnum — the logical eraseblock number to unmap. that's the actual subject of the request, the main character, the reason we're all here 🔥
• dtype — pass "3" for better compatibility with old kernels. yep, just the character 3, as a string in the docs, don't overthink it, just do it for the old-kernel girlies 😭
• padding — reserved for future, not used, has to be zeroed. like, reserved. for future. not used. and it has to be zeroed — that's not a suggestion, that's a rule, do not leave garbage in there 🙈

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💜 SEE ALSO 💜

Kernel file ./include/uapi/mtd/ubi-user.h — that's where the source of truth lives, go read her 📖

• struct ubi_attach_req(9)
• struct ubi_mkvol_req(9)
• struct ubi_rsvol_req(9)
• struct ubi_rnvol_req(9)
• struct ubi_ecinfo_req(9)
• struct ubi_leb_change_req(9)
• struct ubi_set_vol_prop_req(9)
• struct ubi_blkcreate_req(9)

the whole friend group fr fr 🫶 they all hang out together, go say hi 💖

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ok real talk for a sec: padding is reserved for future, not used, and has to be zeroed. don't be the one who leaves it uninitialized and then wonders why things get weird 💀

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and that's the page bestie!! 🎀 brought to you by ./include/uapi/mtd, dated October 2026, all about struct ubi_map_req(9) ⭐ slay, go map some LEBs responsibly 💅✨