calc_pnode_num_from_parent(9)

💅 calc_pnode_num_from_parent(9) — like, the whole glow-up 🎀

okay bestie, welcome to the Kernel API Manual ✨ today we're doing calc_pnode_num_from_parent, and honestly? she's a small function with main character energy. let's get into it 🌸

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🌈 NAME 🌈

calc_pnode_num_from_parent — literally just: calculate pnode number. that's her whole job. iconic behavior, no notes 💅

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✨ SYNOPSIS ✨

int calc_pnode_num_from_parent (const struct ubifs_info *c , struct
ubifs_nnode *parent , int iip );

she takes three things, she returns an int. simple, clean, slay 🫶

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🦋 ARGUMENTS 🦋

• c — the UBIFS file-system description object. like, the whole vibe of the filesystem in one struct 💖
• parent — the parent nnode. yes bestie, the one above her in the tree, we love a family dynamic 🌸
• iip — index in parent. which slot she occupies. her little spot in the group chat, if you will 🎀

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💜 DESCRIPTION 💜

okay so first, the lore 🔥 — the pnode number is a number that uniquely identifies a pnode, and it's designed so you can easily traverse the tree from the root all the way down to that pnode. it's giving "built-in GPS for a tree" and i'm obsessed 😭

and what this function actually does? she calculates and returns the pnode number based on two things: the parent's nnode number, and the index in parent. that's it, that's the tea ☕ no cap, that's the entire function 💀

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👑 SEE ALSO 👑

these are the neighbors, the whole tree, the found family 🧚 — and yes, we're listing every single one because nobody gets left out in this house 💅

• Kernel file ./fs/ubifs/lpt.c do_calc_lpt_geom(9)
• ubifs_calc_lpt_geom(9)
• calc_dflt_lpt_geom(9)
• pack_bits(9)
• ubifs_unpack_bits(9)
• ubifs_pack_pnode(9)
• ubifs_pack_nnode(9)
• ubifs_pack_ltab(9)
• ubifs_pack_lsave(9)
• ubifs_add_lpt_dirt(9)
• set_ltab(9)
• ubifs_add_nnode_dirt(9)
• add_pnode_dirt(9)
• calc_nnode_num(9)
• calc_nnode_num_from_parent(9)
• ubifs_create_dflt_lpt(9)
• update_cats(9)
• replace_cats(9)
• check_lpt_crc(9)
• check_lpt_type(9)
• unpack_pnode(9)
• ubifs_unpack_nnode(9)
• unpack_ltab(9)
• unpack_lsave(9)
• validate_nnode(9)
• validate_pnode(9)
• set_pnode_lnum(9)
• ubifs_read_nnode(9)
• read_pnode(9)
• read_ltab(9)
• read_lsave(9)
• ubifs_get_nnode(9)
• ubifs_get_pnode(9)
• ubifs_pnode_lookup(9)
• ubifs_lpt_lookup(9)
• dirty_cow_nnode(9)
• dirty_cow_pnode(9)
• ubifs_lpt_lookup_dirty(9)
• ubifs_lpt_calc_hash(9)
• lpt_check_hash(9)
• lpt_init_rd(9)
• lpt_init_wr(9)
• ubifs_lpt_init(9)
• struct lpt_scan_node(9)
• scan_get_nnode(9)
• scan_get_pnode(9)
• ubifs_lpt_scan_nolock(9)
• dbg_chk_pnode(9)
• dbg_check_lpt_nodes(9)

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🫶 quick reminder bestie: this page is Kernel API Manual business, lives in ./fs/ubifs, and it's dated October 2026 ⭐ that's the source, the version vibes, and the timestamp all in one cute little bow 🎀

and that's the page!! go traverse that tree, you absolute legend 👑🔥✨💖