is_valid_re...ournal_block(9)

💖 is_valid_recovery_journal_block(9) 💖

okay so bestie, welcome to the Kernel API Manual — this one lives in the kernel galaxy and it's all about one very specific vibe check: is this header actually valid for this journal? let's get into it 🫶

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✨ NAME ✨

is_valid_recovery_journal_block — literally just determines whether the given header describes a valid block for the given journal. that's it. that's the whole job. 💅

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🌸 SYNOPSIS 🌸

bool is_valid_recovery_journal_block (const struct recovery_journal
*journal , const struct recovery_block_header *header , bool old_ok );

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🎀 ARGUMENTS 🎀

• journal — the journal we're using, bestie. the one we're checking against. 👑
• header — the unpacked block header we're checking. yes, unpacked — it's already been unpacked, don't come at me. 🦋
• old_ok — whether an old format header is valid. like, do we accept the vintage look or not. 🌈

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💜 DESCRIPTION 💜

so here's the tea ☕ — a block is not valid if it's unformatted, or if it's older than the last successful recovery or reformat. that's the whole rule. two ways to fail, no cap. 💀

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⭐ RETURN ⭐

True if the header is valid. 🎉 that's it, that's the return value, go off king.

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🦋 SEE ALSO 🦋

all my faves from the Kernel file ./drivers/md/dm-vdo/repair.c:

• as_repair_completion(9)
• abort_repair(9)
• abort_on_error(9)
• drain_slab_depot(9)
• flush_block_map_updates(9)
• handle_page_load_error(9)
• unmap_entry(9)
• remove_out_of_bounds_entries(9)
• process_slot(9)
• rebuild_reference_counts_from_page(9)
• page_loaded(9)
• fetch_page(9)
• rebuild_from_leaves(9)
• process_entry(9)
• advance_points(9)
• before_recovery_point(9)
• get_entry(9)
• validate_recovery_journal_entry(9)
• add_slab_journal_entries(9)
• vdo_replay_into_slab_journals(9)
• find_entry_starting_next_page(9)
• get_recovery_journal_block_header(9)
• is_exact_recovery_journal_block(9)
• find_recovery_journal_head_and_tail(9)
• unpack_entry(9)
• append_sector_entries(9)
• extract_new_mappings(9)
• compute_usages(9)
• vdo_repair(9)

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ok that's the whole page bestie, go validate some headers responsibly 🧚‍♀️💖

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sign-off szn: this little icon comes to you from ./drivers/md/dm-vdo and it's dated October 2026 — and the header up top is is_valid_re...ournal_block(9) in case u were wondering what we've been screaming about this whole time 😭🫶 slay, bye! 💅✨