STRUCT LPT_SCAN_NODE(9)

🌸 struct lpt_scan_node(9) 🌸

okay bestie, welcome to the Kernel API Manual — this is the page for struct lpt_scan_node, and yes it's giving "tiny struct with main character energy" ✨

✨ NAME ✨

struct lpt_scan_node — literally just somewhere to put nodes while we scan LPT. that's it. that's the whole job. 💅

✨ SYNOPSIS ✨

struct lpt_scan_node {
    union {
      struct ubifs_nnode nnode;
      struct ubifs_pnode pnode;
      struct ubifs_cnode cnode;
    };
    int in_tree;
    union {
      struct ubifs_nnode *nnode;
      struct ubifs_pnode *pnode;
      struct ubifs_cnode *cnode;
    } ptr;
 };

like, look at it. two anonymous-ish unions and a little int in the middle. she's compact, she's functional, she's slay 🎀

✨ Members ✨

• {unnamed_union} — anonymous. no name, no problem, she's mysterious like that 🦋
• nnode — where to keep a nnode
• pnode — where to keep a pnode
• cnode — where to keep a cnode

so basically the top union is your little storage cubby: whichever kind of node you've got, there's a slot for it. obsessed 🫶

• in_tree — is the node in the tree in memory. yep, that's the vibe check right there — this little flag tells you whether the node is currently chilling in the in-memory tree or not 🌈
• ptr — union of node pointers. three flavours, pick yours 💖
  • ptr.nnode — pointer to the nnode (if it is an nnode) which may be here or in the tree
  • ptr.pnode — ditto for pnode
  • ptr.cnode — ditto for cnode

"ditto" is doing so much heavy lifting here and honestly? iconic. it means the exact same deal as ptr.nnode: the pointer may point to the node right here, or to the one in the tree. no cap 🔥

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✨ SEE ALSO ✨

heads up bestie: these all live in the kernel file ./fs/ubifs/lpt.c — the whole squad's listed below, and yes you get all of them, no skipping 💀

• 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)
• 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)
• 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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and that's the whole page, bestie — go read the LPT lore, it's a whole universe 🌸💜

sign-off era: this one came out of ./fs/ubifs and is dated October 2026. mwah 💋✨