dbg_check_old_index(9)

💅 dbg_check_old_index(9) — like, the old index vibe check

okay bestie, so this one lives in the Kernel API Manual and it's called dbg_check_old_index — yes it's a mouthful, yes it ate, we move. 🎀

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✨ NAME ✨

dbg_check_old_index — check the old copy of the index. that's it, that's the whole job, and honestly? iconic. 💅

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🌸 SYNOPSIS 🌸

int dbg_check_old_index (struct ubifs_info *c , struct ubifs_zbranch *zroot );

like literally that's the whole signature, no cap 🫶

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🦋 ARGUMENTS 🦋

• c — the UBIFS file-system description object. your whole fs situation lives in here, she's the main character 👑
• zroot — root of the new index. the fresh one. the new-new. 🌈

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💖 DESCRIPTION 💖

okay so here's the lore, bestie. in order to be able to recover from an unclean unmount, a complete copy of the index must exist on flash. this one is what we call the "old" index. 🧚

the commit process has to write the "new" index to flash without overwriting or destroying any part of the old index. like, delicate work. main character energy but make it careful. 🎀

this function gets run at commit end specifically to check that the old index does indeed exist, completely intact. it's giving vibe check at the door. 💅

and the returns:

• 0 on success — slay ✨
• a negative error code on failure — 💀

fr fr, if it's negative something's off with your old index and you should be paying attention, not scrolling.

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👑 SEE ALSO 👑

go read these too, iykyk:

• Kernel file ./fs/ubifs/commit.c do_commit(9)
• run_bg_commit(9)
• ubifs_bg_thread(9)
• ubifs_commit_required(9)
• ubifs_request_bg_commit(9)
• wait_for_commit(9)
• ubifs_run_commit(9)
• ubifs_gc_should_commit(9)
• struct idx_node(9)
• dbg_old_index_check_init(9)

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and that's the page, bestie 🫶 this lil gem comes from ./fs/ubifs, dated October 2026, and the header said Kernel API Manual — we love a documented kernel function. mwah 💋💖