tnc_insert(9)

💅 tnc_insert(9) — insert a node into TNC ✨

okay so before we get into it — this is a tnc_insert(9) situation, page 9 of the Kernel API Manual, and bestie it's giving "small function, big feelings" because it does one thing and then stress-splits when there's no room. iconic behavior honestly. 🎀

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🌸 NAME 🌸

tnc_insert — insert a node into TNC. that's it. that's the whole name. short king. 👑

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✨ SYNOPSIS ✨

int tnc_insert (struct ubifs_info *c , struct ubifs_znode *znode ,
struct ubifs_zbranch *zbr , int n );

note the spacing around those commas, it's literally canon, don't come for me. 🫶

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🦋 ARGUMENTS 🦋

• c — the UBIFS file-system description object. yes the whole file system. yes it's a lot of responsibility. it's fine. 💅
• znode — the znode you're inserting into. your main character znode. 🌟
• zbr — the branch to insert. the little guy going in. 🍓
• n — slot number, like which seat the new zbranch gets at the table. no cap. 🪑

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💖 DESCRIPTION 💖

so the way that this works is: this function inserts a new node described by zbr into znode znode. like dropping a new branch into a znode, lowkey surgical, highkey adorable.

but here's the tea ☕ — if znode does not have a free slot for the new zbranch, it gets split. and not just that — the parent znodes are split as well if needed, so the whole family tree can catch these hands. it's giving "we need to talk about the seating chart" energy. 😭🔥

return value? she's simple:

• returns zero in case of success ✅
• returns a negative error code in case of failure 💀

literally that's it. zero or sad. iykyk.

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👑 SEE ALSO 👑

okay these cross-references are a lot but we don't skip, we don't cut, we list every single one because we're thorough besties. Kernel file ./fs/ubifs/tnc.c plus:

insert_old_idx(9), insert_old_idx_znode(9), ins_clr_old_idx_znode(9), destroy_old_idx(9), copy_znode(9), add_idx_dirt(9), replace_znode(9), dirty_cow_znode(9), lnc_add(9), lnc_free(9), tnc_read_hashed_node(9), try_read_node(9), fallible_read_node(9), matches_name(9), get_znode(9), tnc_next(9), tnc_prev(9), resolve_collision(9), fallible_matches_name(9), fallible_resolve_collision(9), matches_position(9), resolve_collision_directly(9), dirty_cow_bottom_up(9), ubifs_lookup_level0(9), lookup_level0_dirty(9), maybe_leb_gced(9), ubifs_tnc_locate(9), ubifs_tnc_get_bu_keys(9), read_wbuf(9), validate_data_node(9), ubifs_tnc_bulk_read(9), do_lookup_nm(9), ubifs_tnc_lookup_nm(9), ubifs_tnc_lookup_dh(9), correct_parent_keys(9), insert_zbranch(9), ubifs_tnc_add(9), ubifs_tnc_replace(9), ubifs_tnc_add_nm(9), tnc_delete(9), ubifs_tnc_remove(9), ubifs_tnc_remove_nm(9), ubifs_tnc_remove_dh(9), key_in_range(9), ubifs_tnc_remove_range(9), ubifs_tnc_remove_ino(9), ubifs_tnc_next_ent(9), tnc_destroy_cnext(9), ubifs_tnc_close(9), left_znode(9), right_znode(9), lookup_znode(9), is_idx_node_in_tnc(9), is_leaf_node_in_tnc(9), ubifs_tnc_has_node(9), ubifs_dirty_idx_node(9), dbg_check_inode_size(9).

like, the whole friend group. 🫂 a whole group chat worth of functions. go say hi to all of them, they're all in ./fs/ubifs.

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mwah 💋 that's the page. brought to you by ./fs/ubifs, dated October 2026, and this little tnc_insert(9) footer moment is your sign-off — stay splittable, stay slay, and always check for free slots before you commit. 🧚‍♀️🌈✨