update_cats(9)

💅 update_cats(9) — like, the kernel API manual but make it make sense

okay so bestie, you've wandered into update_cats(9), which lives in the Kernel API Manual section 9 (iykyk, that's the kernel-functions girlies). pull up a chair, we're talking about UBIFS internals and honestly it's giving main character energy ✨

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🌸 NAME 🌸

update_cats — no cap, this one adds LEB properties of a pnode to LEB category lists and heaps. that's the whole vibe. that's what she does 💅

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✨ SYNOPSIS ✨

void update_cats (struct ubifs_info *c , struct ubifs_pnode *pnode );

like, literally that. nothing returns, she's a void girlie, we respect it 🫶

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🎀 ARGUMENTS 🎀

• c — the UBIFS file-system description object. your whole filesystem's little biography, basically 💖
• pnode — a pnode. yes bestie, that's the description. it's a pnode. that's the lore 🙈

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🦋 DESCRIPTION 🦋

so here's the situation: when a pnode gets loaded into memory, the LEB properties it's carrying around get added — by this very function — to the LEB category lists and heaps. that's the tea ☕ that's it. that's the whole plot.

like, pnode walks in the door 🚪✨ and update_cats is right there being like "hi bestie, let me file all your LEB properties into the category lists and heaps for you." iconic behavior honestly 👑

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🔥 SEE ALSO 🔥

the friend group, the whole group chat, every single one of them (and yes we're listing all of them, don't @ me):

• 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)
• calc_pnode_num_from_parent(9)
• ubifs_create_dflt_lpt(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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ok that's the whole page bestie, go forth and update those cats 🐈‍⬛💜

and finally, the little sign-off so you know where this came from: this page lives under ./fs/ubifs and it's dated October 2026. slay 🌈⭐