ubi_wl_put_fm_peb(9)

✨ ubi_wl_put_fm_peb(9) ✨

okay so bestie, we're deep in the kernel today, specifically in the ubi_wl_put_fm_peb man page from the Kernel API Manual — this is the one that returns a PEB used in a fastmap to the wear-leveling sub-system 💅. if you need the fuller picture, go peek at ubi_wl_put_peb() too, iykyk.

🌸 SYNOPSIS 🌸

int ubi_wl_put_fm_peb (struct ubi_device *ubi , struct ubi_wl_entry
*fm_e , int lnum , int torture );

that's the whole signature, character for character, no cap 🫶

🎀 ARGUMENTS 🎀

• ubi — the UBI device description object, literally the main character here 👑
• fm_e — the physical eraseblock to return, she's going home 🏠
• lnum — the last used logical eraseblock number for the PEB, keep track bestie 📝
• torture — if this physical eraseblock has to be tortured 😭 yes that's the real name, and yes it's giving exactly what you think

🦋 SEE ALSO 🦋

kernel file ./drivers/mtd/ubi/fastmap-wl.c plus the whole friend group:

• update_fastmap_work_fn(9)
• find_anchor_wl_entry(9)
• return_unused_pool_pebs(9)
• ubi_wl_get_fm_peb(9)
• ubi_refill_pools_and_lock(9)
• produce_free_peb(9)
• ubi_wl_get_peb(9)
• next_peb_for_wl(9)
• need_wear_leveling(9)
• ubi_ensure_anchor_pebs(9)
• ubi_is_erase_work(9)
• may_reserve_for_fm(9)

ngl this one's a short read, but every detail counts — that PEB does not get returned to wear-leveling unless you say so 💖

and that's the vibe check, bestie ✨ this page lives in ./drivers/mtd/ubi, dated October 2026, from the Kernel API Manual — periodt, go read the source and slay 🌈💅🍓