STRUCT UBI_AINF_PEB(9)

✨ struct ubi_ainf_peb — Kernel API Manual ✨

ok so bestie, welcome to the struct ubi_ainf_peb(9) page 💅 this is straight out of the Kernel API Manual and honestly it's giving "backstage pass to UBI" energy. let's get into it 🫶

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🌸 NAME 🌸

struct ubi_ainf_peb — attach information about a physical eraseblock. literally that's the whole vibe, it's the little info-bundle for one PEB while attaching 🔥

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🎀 SYNOPSIS 🎀

struct ubi_ainf_peb {
    int ec;
    int pnum;
    int vol_id;
    int lnum;
    unsigned int scrub:1;
    unsigned int copy_flag:1;
    unsigned long long sqnum;
    union {
      struct rb_node rb;
      struct list_head list;
    } u;
 };

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👑 Members 👑

here's the whole cast, no cap, every single one 💖

• ec — the erase counter (it's UBI_UNKNOWN if it's, y'know, unknown 🙈)
• pnum — the physical eraseblock number
• vol_id — the ID of the volume this LEB belongs to
• lnum — the logical eraseblock number
• scrub — set if this physical eraseblock needs scrubbing 🧚
• copy_flag — this LEB is a copy (the copy_flag is set in the VID header of this LEB, iykyk)
• sqnum — sequence number
• u — a union of the RB-tree or list links ✨
  • u.rb — the link in the per-volume RB-tree of struct ubi_ainf_peb objects
  • u.list — the link in one of the eraseblock lists

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🌈 Description 🌈

okay so the way this works: one object of this type gets allocated for each physical eraseblock when you're attaching an MTD device. main character allocation energy 😭

⭐ lowkey important note: if this PEB doesn't belong to any LEB / volume, then the vol_id and lnum fields get initialized to UBI_UNKNOWN. fr fr, don't forget that.

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💜 SEE ALSO 💜

Kernel file ./drivers/mtd/ubi/ubi.h plus the whole friend group 💅:

struct ubi_vid_io_buf(9), struct ubi_wl_entry(9), struct ubi_ltree_entry(9), struct ubi_rename_entry(9), struct ubi_fastmap_layout(9), struct ubi_fm_pool(9), struct ubi_eba_leb_desc(9), struct ubi_volume(9), struct ubi_volume_desc(9), struct ubi_debug_info(9), struct ubi_device(9), struct ubi_ainf_volume(9), struct ubi_attach_info(9), struct ubi_work(9), ubi_init_vid_buf(9), ubi_free_vid_buf(9), ubi_get_vid_hdr(9), ubi_ro_mode(9), vol_id2idx(9), idx2vol_id(9), ubi_is_fm_vol(9), ubi_find_fm_block(9)

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and that's the page bestie!! 🦋 source is ./drivers/mtd/ubi, dated October 2026 — iconic, slay, periodt 💖✨ no thoughts just eraseblocks 🍓