ubi_update_fastmap(9)

💅 ubi_update_fastmap(9) — Kernel API Manual ✨

okay bestie, buckle up, we're in the kernel API manual and this one is short but she matters. So ubi_update_fastmap(9) is literally gonna be called by UBI if a volume changes or a fastmap pool becomes full. that's the whole vibe. it's giving "glow-up notification" 💖

---

🌸 NAME 🌸

ubi_update_fastmap — will be called by UBI if a volume changes or a fastmap pool becomes full 👑

---

🎀 SYNOPSIS 🎀

int ubi_update_fastmap (struct ubi_device *ubi );

yes that's the whole signature, no cap, she's tidy 🫶

---

🦋 ARGUMENTS 🦋

• ubi — the UBI device object. that's her. that's the main character 🌈

---

✨ DESCRIPTION ✨

okay so here's the tea: this function returns 0 on success 🎉 and < 0 indicates an internal error 💀. literally that's it. short and iconic. periodt.

---

💜 SEE ALSO 💜

Kernel file ./drivers/mtd/ubi/fastmap.c — go read her, she's the source bestie 📖

• init_seen(9)
• free_seen(9)
• set_seen(9)
• self_check_seen(9)
• ubi_calc_fm_size(9)
• new_fm_vbuf(9)
• add_aeb(9)
• add_vol(9)
• assign_aeb_to_av(9)
• update_vol(9)
• process_pool_aeb(9)
• unmap_peb(9)
• scan_pool(9)
• count_fastmap_pebs(9)
• ubi_attach_fastmap(9)
• find_fm_anchor(9)
• ubi_scan_fastmap(9)
• ubi_write_fastmap(9)
• invalidate_fastmap(9)
• return_fm_pebs(9)

like, the whole fastmap friend group 🧚‍♀️ iykyk

---

so yeah that's the whole page, no notes, she ate and left no crumbs 💅

shoutout to the ./drivers/mtd/ubi directory for housing all this, dated October 2026, and this is ubi_update_fastmap(9) signing off — stay slay, keep your fastmaps fresh, mwah 🍓💜