STRUCT IDX_NODE(9)

💖 NAME 💖

okay so welcome to struct idx_node(9) from the Kernel API Manual, bestie 💖 — this one is literally: struct idx_node — hold index nodes during index tree traversal. no cap, that's the name and the job.

✨ SYNOPSIS ✨

here's the struct in exact-character mode, bestie — do not freestyle it, struct definitions are not a mood board:

       struct idx_node {
           struct list_head list;
           int iip;
           union ubifs_key upper_key;
           struct ubifs_idx_node idx;
        };

🫶 Members 🫶

okay so these are the members, and yes every single one is important 🫶

• list — list. that's it, that's the description, and honestly the minimalism ate 💅
• iip — index in parent (slot number of this indexing node in the parent indexing node). like, it knows its little slot in the parent indexing node.
• upper_key — all keys in this indexing node have to be less or equivalent to this key. so every key in this node has to be less or equivalent to this key, fr fr.
• idx — index node (8-byte aligned because all node structures must be 8-byte aligned). alignment is mandatory, bestie — all node structures must be 8-byte aligned, periodt.

👀 SEE ALSO 👀

the kernel file ./fs/ubifs/commit.c is where it's at, and these are the cross-refs you can go peek at:

• do_commit(9)
• run_bg_commit(9)
• ubifs_bg_thread(9)
• ubifs_commit_required(9)
• ubifs_request_bg_commit(9)
• wait_for_commit(9)
• ubifs_run_commit(9)
• ubifs_gc_should_commit(9)
• dbg_old_index_check_init(9)
• dbg_check_old_index(9)

okay that's the page, bestie 🫶 — source is ./fs/ubifs, date is October 2026, and now you can go slay that index tree traversal with main character energy ✨💅