STRUCT UBI_FM_SCAN_POOL(9)

💅 struct ubi_fm_scan_pool(9) — Kernel API Manual

okay so picture this: you're a kernel dev, you're deep in ./drivers/mtd/ubi, and the manual you're reading is literally called Kernel API Manual. iconic. this page is about struct ubi_fm_scan_pool, and bestie, the whole vibe is "Fastmap pool PEBs to be scanned while attaching." that's it, that's the name. she's a little struct with a big job 🫶

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✨ NAME ✨

struct ubi_fm_scan_pool — Fastmap pool PEBs to be scanned while attaching

like, this struct is the guest list of PEBs that fastmap says "hey, go look at these" while you're attaching. no cap 💅

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🌸 SYNOPSIS 🌸

struct ubi_fm_scan_pool {
    __be32 magic;
    __be16 size;
    __be16 max_size;
    __be32 pebs[UBI_FM_MAX_POOL_SIZE];
    __be32 padding[4];
 };

look at her. she's perfect. she's __be32-coded. 🎀

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🦋 Members 🦋

• magic — the pool magic number, and it's UBI_FM_POOL_MAGIC babe, that's the whole identity check. if it doesn't match, it's not her 💀
• size — current pool size. how many PEBs we're actually working with right now, lowkey.
• max_size — maximal pool size. the ceiling. the limit. the "you shall not exceed" energy 👑
• pebs — an array containing the location of all PEBs in this pool. literally the whole point of the struct, ngl. the size of the array is UBI_FM_MAX_POOL_SIZE, so that's the hard cap on how many locations fit 🔥

also she's got a padding[4] field — yes it's in the synopsis and no the Members section doesn't talk about it, so I'm not gonna invent a personality for it. it's padding. it's padding-ing. periodt ✨

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🌈 SEE ALSO 🌈

sibling structs, all living in the same kernel file ./drivers/mtd/ubi/ubi-media.h — go say hi to the whole family:

• struct ubi_ec_hdr(9)
• struct ubi_vid_hdr(9)
• struct ubi_vtbl_record(9)
• struct ubi_fm_sb(9)
• struct ubi_fm_hdr(9)
• struct ubi_fm_ec(9)
• struct ubi_fm_volhdr(9)
• struct ubi_fm_eba(9)

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🩷 tiny note bestie: the manual lists the kernel file as ./drivers/mtd/ubi/ubi-media.h — that's where she lives, that's where you'll find her.

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omg and that's the page!! mwah 💖 this came out of ./drivers/mtd/ubi, dated October 2026, and it's struct ubi_fm_scan_pool(9) all the way down. go read the source, it's giving main character energy, iykyk 🌟