STRUCT UBIFS_ZNODE(9)

💖 struct ubifs_znode(9) 💖

okay bestie, so this is a page from the Kernel API Manual, and today's main character is struct ubifs_znode — the in-memory representation of an indexing node. no cap, that's literally what it is. and the kernel file it lives in is ./fs/ubifs/ubifs.h, in case you were wondering where to find it. 👑

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✨ SYNOPSIS ✨

here's the whole glow-up, in code, exactly as it is:

struct ubifs_znode {
    struct ubifs_znode *parent;
    struct ubifs_znode *cnext;
    struct ubifs_znode *cparent;
    int ciip;
    unsigned long flags;
    time64_t time;
    int level;
    int child_cnt;
    int iip;
    int alt;
    int lnum;
    int offs;
    int len;
    struct ubifs_zbranch zbranch[];
};

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🎀 Members 🎀

ok so each of these fields has lore, let's get into it:

• parent — the parent znode, or NULL if this girly is the root. main character energy, honestly.
• cnext — the next znode to commit.
• cparent — the parent node for this commit.
• ciip — the index in cparent's zbranch array.
• flags — the znode flags (DIRTY_ZNODE, COW_ZNODE or OBSOLETE_ZNODE). pick your fighter 💅
• time — last access time, in seconds.
• level — the level of the entry in the TNC tree.
• child_cnt — how many child znodes there are.
• iip — the index in the parent's zbranch array.
• alt — lower bound of the key range has altered, i.e. a child got inserted at slot 0.
• lnum — LEB number of the corresponding indexing node.
• offs — offset of the corresponding indexing node.
• len — length of the corresponding indexing node.
• zbranch — array of znode branches (c->fanout elements).

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🌸 Description 🌸

⚠️ Note! the lnum, offs, and len fields are not really needed — we have them only for internal consistency check. they could be removed to save some RAM. so like... they're just vibing there for safety. ngl, relatable. 😭

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🦋 SEE ALSO 🦋

Kernel file ./fs/ubifs/ubifs.h, plus the whole friend group:

• 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_zbranch(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)

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and that's the whole page, bestie, you ate that 🫶 this little drop came from ./fs/ubifs and it's dated October 2026 — iconic, periodt. 💜✨