scan_fast(9)

scan_fast(9) 🦋✨

okay bestie, welcome to scan_fast(9) from the Kernel API Manual — this is the page where UBI goes looking for a fastmap and tries to attach from it. periodt. 💅

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🌸 NAME 🌸

scan_fast — try to find a fastmap and attach from it.

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✨ SYNOPSIS ✨

int scan_fast (struct ubi_device *ubi , struct ubi_attach_info **ai );

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🎀 ARGUMENTS 🎀

• ubi — UBI device description object
• ai — attach info object

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💖 DESCRIPTION 💖

okay so the return-value vibe check is this: it returns 0 on success, and negative return values indicate an internal error. 😭

UBI_NO_FASTMAP denotes that no fastmap was found. UBI_BAD_FASTMAP denotes that the found fastmap was invalid. no cap, those two constants are doing main character energy in this description. 🫶

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👑 SEE ALSO 👑

Kernel file ./drivers/mtd/ubi/attach.c — and the whole friend group is:

• find_or_add_av(9)
• ubi_find_or_add_av(9)
• ubi_alloc_aeb(9)
• ubi_free_aeb(9)
• add_to_list(9)
• add_corrupted(9)
• add_fastmap(9)
• validate_vid_hdr(9)
• add_volume(9)
• ubi_compare_lebs(9)
• ubi_add_to_av(9)
• ubi_add_av(9)
• ubi_find_av(9)
• ubi_remove_av(9)
• early_erase_peb(9)
• ubi_early_get_peb(9)
• check_corruption(9)
• scan_peb(9)
• late_analysis(9)
• destroy_av(9)
• destroy_ai(9)
• scan_all(9)
• ubi_attach(9)
• self_check_ai(9)

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signed off from ./drivers/mtd/ubi, October 2026 — mwah 💋💖