dbg_populate_lsave(9)

💅 dbg_populate_lsave(9) — the manual, but make it make sense

okay bestie, this is dbg_populate_lsave(9), straight out of the Kernel API Manual, and honestly? it's giving chaos-for-science and I'm kind of obsessed 🎀

---

✨ SYNOPSIS ✨

int dbg_populate_lsave (struct ubifs_info *c );

that's it, that's the whole vibe. one function, one argument, iconic behavior 🌸

---

🫶 ARGUMENTS 🫶

• c — the UBIFS file-system description object 💖 like, this is your little handle on the whole filesystem situation, and yes you do need it

---

🔥 DESCRIPTION 🔥

okay so here's the tea ☕ this is the debugging version of populate_lsave(). Instead of populating lsave with useful LEBs, it fills it with random LEBs — and no, that's not a bug, that's the whole point, it's literally good for test coverage 💀🙈

so what does it return? well 👑

• returns zero if lsave has not been populated — which lowkey means this debugging feature is disabled
• returns non-zero if lsave has been populated ✨

yeah it's that simple. no cap. 🦋

---

👀 SEE ALSO 👀

first up, the kernel file this whole situation lives in: ./fs/ubifs/lpt_commit.c — go read it, iykyk 💅

and now, the guest list (it's long, but we respect every single one of them, periodt):

first_dirty_cnode(9), next_dirty_cnode(9), get_cnodes_to_commit(9), upd_ltab(9), alloc_lpt_leb(9), layout_cnodes(9), realloc_lpt_leb(9), write_cnodes(9), next_pnode_to_dirty(9), add_pnode_dirt(9), do_make_pnode_dirty(9), make_tree_dirty(9), need_write_all(9), lpt_tgc_start(9), lpt_tgc_end(9), populate_lsave(9), nnode_lookup(9), make_nnode_dirty(9), make_pnode_dirty(9), make_ltab_dirty(9), make_lsave_dirty(9), make_node_dirty(9), get_lpt_node_len(9), get_pad_len(9), get_lpt_node_type(9), is_a_node(9), lpt_gc_lnum(9), lpt_gc(9), ubifs_lpt_start_commit(9), free_obsolete_cnodes(9), ubifs_lpt_end_commit(9), ubifs_lpt_post_commit(9), first_nnode(9), next_nnode(9), ubifs_lpt_free(9), dbg_is_all_ff(9), dbg_is_nnode_dirty(9), dbg_is_pnode_dirty(9), dbg_is_ltab_dirty(9), dbg_is_lsave_dirty(9), dbg_is_node_dirty(9), dbg_check_ltab_lnum(9), dbg_check_ltab(9), dbg_chk_lpt_free_spc(9), dbg_chk_lpt_sz(9), dump_lpt_leb(9), ubifs_dump_lpt_lebs(9)

like, that's the whole friend group and every single one of them showed up to the function 🧚💜

---

⚠️ friendly reminder bestie: this is a debugging version, so the random-LEB thing is intentional — don't come for it, it's doing its job 🫶

---

✨ and that's the page! ✨ this lil manual came from ./fs/ubifs, dated October 2026, and we are officially done here. mwah, go populate something (safely) 💋🎀🦋