check_corruption(9)

✨ check_corruption(9) ✨

ok so real talk, this one lives in the Kernel API Manual and it's genuinely one of those tiny helper functions that's doing so much emotional labor behind the scenes. bestie, let's get into it 💅

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🌸 NAME 🌸

check_corruption — the girl who checks the data area of a PEB. that's it, that's the job 🎀

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🦋 SYNOPSIS 🦋

int check_corruption (struct ubi_device *ubi , struct ubi_vid_hdr
*vid_hdr , int pnum );

like, yes, the line break in the middle is real, don't come for me, that's literally how it's written 😭

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💖 ARGUMENTS 💖

• ubi — the UBI device description object. your main character struct, the one who knows everything about the device 🫶
• vid_hdr — the (corrupted) VID header of this PEB. yes bestie, it's corrupted, that's literally why we're here 🙈
• pnum — the physical eraseblock number to check. like the address of the crime scene 🔍

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🔥 DESCRIPTION 🔥

okay so this is a helper function, and its whole personality is distinguishing between VID header corruptions caused by power cuts vs. corruptions caused by other reasons. that's the vibe check it performs. iconic honestly.

here's the tea:

• if the PEB contains only 0xFF bytes in the data area → the VID header is most probably corrupted because of a power cut, and 0 is returned in this case ✨
• otherwise → it was probably corrupted for some other reasons, and 1 is returned in this case 💀
• and if a read error occurred, a negative error code is returned 🚨

ngl this matters a LOT. if the corruption reason was a power cut, UBI can safely erase this PEB. otherwise, it should preserve it to avoid possibly destroying important information. do not skip this step, i am begging 🫶

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🌈 SEE ALSO 🌈

the whole friend group, no cap:

• Kernel file ./drivers/mtd/ubi/attach.c
• find_or_add_av(9)
• ubi_find_or_add_av(9)
• ubi_alloc_aeb(9)
• ubi_free_aeb(9)
• add_to_list(9)
• add_corrupted(9)
• add_fastmap(9)
• validate_vid_hdr(9)
• add_volume(9)
• ubi_compare_lebs(9)
• ubi_add_to_av(9)
• ubi_add_av(9)
• ubi_find_av(9)
• ubi_remove_av(9)
• early_erase_peb(9)
• ubi_early_get_peb(9)
• scan_peb(9)
• late_analysis(9)
• destroy_av(9)
• destroy_ai(9)
• scan_all(9)
• scan_fast(9)
• ubi_attach(9)
• self_check_ai(9)

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and that's the whole page bestie, mwah 💋 this cutie comes from ./drivers/mtd/ubi and it's dated October 2026 — go forth and check those corruptions responsibly, iykyk 🧚‍♀️⭐