vdo_compute...l_check_byte(9)

💅 NAME 💅

okay so bestie, gather round, because this page is about ONE function and it's a whole vibe:

vdo_compute_recovery_journal_check_byte — literally compute the check byte for a given sequence number. that's it. that's the function. slay. ✨

this is page 9 of the Kernel API Manual, ie the kernel API manual, section 9 (kernel devs only, sorry not sorry 🙈).

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🦋 SYNOPSIS 🦋

u8 vdo_compute_recovery_journal_check_byte (const struct
recovery_journal *journal , sequence_number_t sequence );

the way that it hands you back a u8… a whole unsigned 8-bit moment. iconic. no cap. 👑

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🎀 ARGUMENTS 🎀

• journal — the journal. yes, that's the entire description. it's giving "you already know". 🙈 it's a const struct recovery_journal * btw, so it is NOT here for your drama, you cannot modify her.
• sequence — the sequence number, typed as sequence_number_t. it's the number of the sequence. that's the lore. 🫶

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⭐ RETURN ⭐

you get back the check byte corresponding to the sequence number — a u8 that is the check byte, matched up with the sequence number you passed in. like a lil matching set. cute fr fr 🎀

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🌸 SEE ALSO 🌸

• the kernel file ./drivers/md/dm-vdo/recovery-journal.h, which is where the recovery journal.(9) page lives — go read it, iykw yk 🌈
• vdo_get_recovery_journal_block_number(9) — the other half of your recovery-journal reading list, bestie 💜

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okay and like, a proper sign-off because we are classy in this house: this page comes from the source dir ./drivers/md/dm-vdo, and she's dated October 2026. go forth and compute those check bytes, main character energy only. 💅✨🍓