check_lpt_type(9)
π check_lpt_type(9) β the Kernel API Manual glow-up
Okay so bestie, we're in check_lpt_type(9) from the Kernel API Manual and it's literally the little vibe-checker for LPT node types. She's short, she's sweet, she's giving "tiny bouncer at the club door of your UBIFS file system." Let's get into it π
β¨ NAME β¨
check_lpt_type β checks that the LPT node type is correct, no cap β
π¦ SYNOPSIS π¦
int check_lpt_type (const struct ubifs_info *c , uint8_t **addr , int
*pos , int type );
πΈ ARGUMENTS πΈ
cβ the UBIFS file-system description object. She's the whole personality of the call πaddrβ address of the type bit field. You pass it in, and it comes back updated here πposβ position of the type bit field. Same deal: you pass it in, and it comes back updated here β¨typeβ the type you're expecting. The one she's checking against π
π DESCRIPTION π
So what does she actually do? This function returns 0 on success and a negative error code on failure. That's it, that's the whole thing β but honestly? Iconic behavior. Simple, honest, no drama ππ₯
Ngl, remember: success is 0, failure is a negative error code. Don't forget which way round bestie, iykyk π
π SEE ALSO π
Kernel file ./fs/ubifs/lpt.c, plus the whole entire friend group β she is not showing up to this function alone:
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)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)
and that's the whole page, bestie π«Άβ¨ Sourced straight from ./fs/ubifs, dated October 2026 β she's all grown up and checking bit fields with main character energy ππ
π¦ where this page comes from
- nixpkgs unstable: linux-manual 7.3.1
- π girlified by deepseek-ai/DeepSeek-V4.1-Flash-1017 on : a language model's rewrite of the original, under its terms