destroy_old_idx(9)

💅 destroy_old_idx(9) 💅

okay bestie, welcome to the Kernel API Manual corner where we’re talking about destroy_old_idx — yes, the function whose whole vibe is “destroy the old_idx RB-tree.” it’s giving cleanup era, no cap. 💖

✨ NAME ✨

destroy_old_idx - destroy the old_idx RB-tree. 🎀

💅 SYNOPSIS 💅

void destroy_old_idx (struct ubifs_info *c );

🎀 ARGUMENTS 🎀

• c — UBIFS file-system description object. that’s the whole argument, bestie; it’s literally the UBIFS file-system description object. 🫶

🌸 DESCRIPTION 🌸

So during start commit, the old_idx RB-tree is used to avoid overwriting index nodes that were in the index last commit but have since been deleted. this is necessary for recovery — i.e. the old index must be kept intact until the new index is successfully written. the old-idx RB-tree is used for the in-the-gaps method of writing index nodes and is destroyed every commit. periodt. 🦋

🦋 SEE ALSO 🦋

Kernel file ./fs/ubifs/tnc.c — and its whole SEE ALSO friend group:

• insert_old_idx(9)
• insert_old_idx_znode(9)
• ins_clr_old_idx_znode(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_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)

💌 cute little sign-off: source/version is ./fs/ubifs, the date is October 2026, and yes bestie this iconic page is still destroy_old_idx(9) — mwah 💋