alloc_idx_lebs(9)

✨ alloc_idx_lebs — the Kernel API Manual entry that's literally about making room for index nodes ✨

okay so bestie, welcome to alloc_idx_lebs from the Kernel API Manual — yes that's the manual name, and yes it's giving very "deep in the fs/ubifs trenches" energy and we're obsessed 🫶

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💖 NAME 💖

alloc_idx_lebs — allocate empty LEBs to be used to commit.

like, it grabs you some nice empty LEBs so the commit can actually happen. that's the whole job. icon behaviour honestly 🎀

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✨ SYNOPSIS ✨

int alloc_idx_lebs (struct ubifs_info *c , int cnt );

one function, two args, returns an int. short and slay 💅

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🦋 ARGUMENTS 🦋

• c — the UBIFS file-system description object 💖 this is your whole contexte, your main character struct, the thing that knows everything about the filesystem.
• cnt — the number of znodes you wanna commit. that's it, that's the count, don't overthink it bestie 🌸

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🔥 DESCRIPTION 🔥

so here's the vibe check: this function goes and allocates empty LEBs that are gonna be used to commit. 🧚

if it cannot allocate a sufficient number of empty LEBs, it returns -ENOSPC — no space, bestie, it's giving "the disk said no" 😭 but if everything works out?

0 is returned on success. periodt. ✨

and anything else? a negative error code gets returned. like, that's the whole contract, no cap. ⭐

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👑 SEE ALSO 👑

Kernel file ./fs/ubifs/tnc_commit.c plus the whole friend group of functions that are lowkey in the same orbit — 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)
• free_unused_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)

that's nineteen besties, i counted, and they're all linked for a reason 💜

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sign-off time 🫶 this little page lives out of ./fs/ubifs and it's dated October 2026 — so yeah, future vibes, present-tense slay. 💀🎀✨