free_unused_idx_lebs(9)

💅 free_unused_idx_lebs(9) — the kernel API glow-up

okay so bestie, welcome to section 9 of the Kernel API Manual 🎀 we're talking about free_unused_idx_lebs, and no cap, it's one of those tiny little cleanup girlies that keeps the whole UBIFS operation from looking a mess.

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✨ NAME ✨

free_unused_idx_lebs — frees the unused LEBs that got allocated for the commit 💖

like, the ones nobody ended up needing. she's the friend who takes the extra party bags home.

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🦋 SYNOPSIS 🦋

int free_unused_idx_lebs (struct ubifs_info *c );

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🌸 ARGUMENTS 🌸

• c — the UBIFS file-system description object. that's it. that's the whole vibe check. 🫶

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👑 DESCRIPTION 👑

so here's the situation, right? it is genuinely possible that we allocate more empty LEBs for the commit than we actually need 😭 like we over-packed. we brought three outfits, we wore one.

this function frees the surplus. the leftovers. the extra. she cleans up after the over-allocation moment, and honestly? iconic behaviour.

she returns 0 on success ✨ and a negative error code on failure 💀 so always check the return value, bestie, fr fr.

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🔥 SEE ALSO 🔥

the whole friend group lives in the kernel file ./fs/ubifs/tnc_commit.c — go say hi to all of them:

• make_idx_node(9)
• fill_gap(9)
• find_old_idx(9)
• is_idx_node_in_use(9)
• layout_leb_in_gaps(9)
• get_leb_cnt(9)
• layout_in_gaps(9)
• layout_in_empty_space(9)
• layout_commit(9)
• find_first_dirty(9)
• find_next_dirty(9)
• get_znodes_to_commit(9)
• alloc_idx_lebs(9)
• free_idx_lebs(9)
• ubifs_tnc_start_commit(9)
• write_index(9)
• free_obsolete_znodes(9)
• return_gap_lebs(9)
• ubifs_tnc_end_commit(9)

lowkey the most stacked SEE ALSO ever?? the way the whole commit pipeline showed up 💅

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that's the whole page, bestie 💖 this one came straight out of ./fs/ubifs, dated October 2026, and it's living its best life as free_unused_idx_lebs(9) in the Kernel API Manual. mwah 😘🍓 go free those LEBs, you got this 🧚‍♀️✨