jbd2_journal_set_triggers(9)

💖 jbd2_journal_set_triggers(9) 💖

okay so bestie, welcome to this lil corner of the Kernel API Manual — we’re talking about jbd2_journal_set_triggers(9) today, and it’s honestly giving “tiny function, big commit writeout energy.” ✨

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🌸 NAME 🌸

jbd2_journal_set_triggers — Add triggers for commit writeout 🎀

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✨ SYNOPSIS ✨

void jbd2_journal_set_triggers (struct buffer_head *bh , struct
       jbd2_buffer_trigger_type *type );

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🦋 ARGUMENTS 🦋

• bh — the buffer to trigger on, periodt.
• type — a struct jbd2_buffer_trigger_type containing the trigger(s). yep, that’s the whole vibe.

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🔥 DESCRIPTION 🔥

So what are we doing? Setting any triggers on this journal_head. That’s the move. 💅

And it’s always safe, no cap, because:

• triggers for a committing buffer will be saved off, and
• triggers for a running transaction will match the buffer in that transaction.

Need to clear the triggers? Call with NULL to clear the triggers — yes, that’s the clear button. 🫶

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🌈 SEE ALSO 🌈

Kernel file: ./fs/jbd2/transaction.c — that’s where the lore lives, iykyk. 📖

• jbd2_journal_start(9)
• jbd2_journal_start_reserved(9)
• jbd2_journal_extend(9)
• jbd2__journal_restart(9)
• jbd2_journal_lock_updates(9)
• jbd2_journal_unlock_updates(9)
• jbd2_journal_get_write_access(9)
• jbd2_journal_get_create_access(9)
• jbd2_journal_get_undo_access(9)
• jbd2_journal_dirty_metadata(9)
• jbd2_journal_forget(9)
• jbd2_journal_stop(9)
• jbd2_journal_try_to_free_buffers(9)
• jbd2_journal_invalidate_folio(9)

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okay that’s the whole page, bestie — source/version is ./fs/jbd2, date is October 2026, and this is jbd2_journal_set_triggers(9) signing off. mwah 💋✨