ubifs_tnc_replace(9)

💅 ubifs_tnc_replace(9) 💅

okay so bestie, this page is from the Kernel API Manual and it is giving very specific conditional-replacement energy. We are talking ubifs_tnc_replace(9), TNC business, and the old node has to be found or we simply do not proceed. periodt. ✨

🎀 NAME 🎀

ubifs_tnc_replace — replace a node in the TNC only if the old node is found. Conditional replacement? We love a function with boundaries. 💖

🦋 SYNOPSIS 🦋

int ubifs_tnc_replace (struct ubifs_info *c , const union ubifs_key *key , int old_lnum , int old_offs , int lnum , int offs , int len );

🌸 ARGUMENTS 🌸

• c — UBIFS file-system description object, aka the context bestie.
• key — key to add.
• old_lnum — LEB number of old node.
• old_offs — old node offset.
• lnum — LEB number of node.
• offs — node offset.
• len — node length.

✨ DESCRIPTION ✨

This function replaces a node with key key in the TNC only if the old node is found. That is the whole condition, and honestly? Iconic. 🫶

It is called by garbage collection when node are moved. (Yes, exactly that vibe: nodes get moved, this function gets called.) 😭

It returns 0 on success or a negative error code on failure. So 0 is the slay; negative is the "welp". 💅

🌈 SEE ALSO 🌈

Kernel file ./fs/ubifs/tnc.c is the source-file bestie, and the whole referenced friend group 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_nm(9)
• ubifs_tnc_lookup_dh(9)
• correct_parent_keys(9)
• insert_zbranch(9)
• tnc_insert(9)
• ubifs_tnc_add(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)

mwah 💋 — source/version: ./fs/ubifs; date: October 2026. Bye bestie, go replace responsibly! 👑