ubifs_tnc_lookup_nm(9)

✨ NAME ✨

okay so bestie, this page is about ubifs_tnc_lookup_nm — like, from the Kernel API Manual 💅 — and its whole thing is to look up a “hashed” node. iykyk ✨

🌸 SYNOPSIS 🌸

int ubifs_tnc_lookup_nm (struct ubifs_info *c , const union ubifs_key
*key , void *node , const struct fscrypt_name *nm );

🎀 ARGUMENTS 🎀

• c — the UBIFS file-system description object 🫶
• key — the node key to look up 🔑
• node — the node is returned here, bestie 📦
• nm — the node name 🌸

🦋 DESCRIPTION 🦋

So this function looks up and reads a node that contains a name hash in the key. Because the hash may have collisions, there may be many nodes with the same key — so we have to sequentially look to all of them until the needed one is found. No cap.

It returns 0 in case of success, -ENOENT if the node was not found, and a negative error code in case of failure. That’s the whole vibe check 💅

lowkey important: collisions are real, so it’s not just a one-and-done lookup — it checks them in sequence until it finds the right one ✨

💜 SEE ALSO 💜

Kernel file ./fs/ubifs/tnc.c — that’s the source bestie. The whole related-function squad is:

• 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_dh(9), correct_parent_keys(9), insert_zbranch(9), tnc_insert(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)

k bye bestie 🫶 — this iconic little page came from ./fs/ubifs, dated October 2026, and it’s literally for ubifs_tnc_lookup_nm(9) ✨💖