dbg_check_lprops(9)

💅 dbg_check_lprops(9) — a Kernel API Manual moment ✨

okay so bestie, we're in the <pink>Kernel API Manual</pink> today and the star of the show is literally dbg_check_lprops(9) — yes that's the whole page name AND the manual section, slay. let's get into it 🫶

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🌸 NAME 🌸

dbg_check_lprops — check all LEB properties. that's it, that's the gig 💅

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✨ SYNOPSIS ✨

int dbg_check_lprops (struct ubifs_info *c );

like… that's the whole signature. short, iconic, to the point 👑

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🎀 ARGUMENTS 🎀

• c — the UBIFS file-system description object. it's giving "the whole entire filesystem, described" 🌈 you hand her the object, she does the vibes check.

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🦋 DESCRIPTION 🦋

so what does she actually do? bestie. she checks all the LEB properties and makes sure they are all correct. all of them. every last one. no cap, she is thorough 🧚

what she gives you back:

• 0 (zero) when everything is fine — a clean vibe check, we love to see it ✨
• -EINVAL when there's an inconsistency — red flag, someone lied on their LEB properties 😭
• other negative error codes in case of other errors — because sometimes life is just like that 💀

now here's the important part, the part where you go "wait, do I need to lock anything?" — no. this function is called while the file system is locked (because of commit start), so no additional locking is required. the lock is already there, she's already inside, we're chilling 🫶

⚠️ ok but real talk: note that locking the LPT mutex would cause a circular lock dependency with the TNC mutex. so like… don't. deadlock is NOT main character energy, it's just giving disaster 🙈

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🔥 SEE ALSO 🔥

the whole friend group, fr fr — Kernel file ./fs/ubifs/lprops.c and honestly the entire lprops extended universe:

• get_heap_comp_val(9)
• move_up_lpt_heap(9)
• adjust_lpt_heap(9)
• add_to_lpt_heap(9)
• remove_from_lpt_heap(9)
• lpt_heap_replace(9)
• ubifs_add_to_cat(9)
• ubifs_remove_from_cat(9)
• ubifs_replace_cat(9)
• ubifs_ensure_cat(9)
• ubifs_categorize_lprops(9)
• change_category(9)
• ubifs_calc_dark(9)
• is_lprops_dirty(9)
• ubifs_change_lp(9)
• ubifs_get_lp_stats(9)
• ubifs_change_one_lp(9)
• ubifs_update_one_lp(9)
• ubifs_read_one_lp(9)
• ubifs_fast_find_free(9)
• ubifs_fast_find_empty(9)
• ubifs_fast_find_freeable(9)
• ubifs_fast_find_frdi_idx(9)
• dbg_check_cats(9)
• scan_check_cb(9)

like a whole group chat of functions, and every single one of them is invited to the function 🎉

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and that's the page!! ty for coming to my TED talk 💜 sign-off time: this beauty lives in ./fs/ubifs and it's dated October 2026. periodt. go check those LEB properties, bestie, I believe in you 🌟