STRUCT UBIFS_ZBRANCH(9)

💖 struct ubifs_zbranch(9) 💖

okay so bestie, welcome to the Kernel API Manual — yes, we're doing kernel API now, we contain multitudes 🧚✨. This page is all about struct ubifs_zbranch, which is literally a key/coordinate/length branch stored in znodes. That's the whole vibe. It's giving "small struct, big responsibilities" 👑

✨ SYNOPSIS ✨

ok so here's the actual shape of it, and yes, it's an anonymous union, we love a mystery 🎀:

struct ubifs_zbranch {
    union ubifs_key key;
    union {
      struct ubifs_znode *znode;
      void *leaf;
    };
    int lnum;
    int offs;
    int len;
    u8 hash[UBIFS_HASH_ARR_SZ];
 };

🌸 Members 🌸

bestie, let's go through the members one by one, no skipping, we don't do that here 🫶

• key — the key. that's it. that's the field 💅
• {unnamed_union} — anonymous. spooky. mysterious. no name, all vibes 🙈
• znode — the znode address in memory 📍
• leaf — the leaf node 🍓
• lnum — the LEB number of the target node (and heads up, that target node can be an indexing node or a data node — both valid, both iconic) 🔥
• offs — the target node's offset within lnum 🎯
• len — the target node length 📏
• hash — the hash of the target node 🔐

🦋 SEE ALSO 🦋

no cap, this is a long list, so buckle up — all of these live in the kernel file ./fs/ubifs/ubifs.h:

• struct ubifs_old_idx(9)
• struct ubifs_scan_node(9)
• struct ubifs_scan_leb(9)
• struct ubifs_gced_idx_leb(9)
• struct ubifs_inode(9)
• struct ubifs_unclean_leb(9)
• struct ubifs_lprops(9)
• struct ubifs_lpt_lprops(9)
• struct ubifs_lp_stats(9)
• struct ubifs_cnode(9)
• struct ubifs_pnode(9)
• struct ubifs_nbranch(9)
• struct ubifs_nnode(9)
• struct ubifs_lpt_heap(9)
• struct ubifs_wbuf(9)
• struct ubifs_bud(9)
• struct ubifs_jhead(9)
• struct ubifs_znode(9)
• struct bu_info(9)
• struct ubifs_node_range(9)
• struct ubifs_compressor(9)
• struct ubifs_budget_req(9)
• struct ubifs_orphan(9)
• struct ubifs_mount_opts(9)
• struct ubifs_budg_info(9)
• struct ubifs_stats_info(9)
• struct ubifs_info(9)
• ubifs_check_hash(9)
• ubifs_check_hmac(9)
• ubifs_branch_hash(9)
• ubifs_copy_hash(9)
• ubifs_auth_node_sz(9)

fr fr, go read those if you wanna actually understand the indexing situation. iykyk 💀

okay that's the whole page bestie, you ate that 🫶✨ this one came from ./fs/ubifs and it's dated October 2026, and the footer says struct ubifs_zbranch(9) — main character energy from start to finish 👑💖 periodt.