write_block(9)

💖 write_block(9) — Kernel API Manual 💖

okay bestie, welcome to the write_block(9) page from the Kernel API Manual. It’s short, it’s sweet, it’s giving “one little callback doing its thing” energy, and we’re gonna read it together. 🫶

🎀 NAME 🎀

write_block — issue a block for writing. That’s it, that’s the whole name section, and honestly? iconic. 💅

✨ SYNOPSIS ✨

The signature is literally this, no cap:

void write_block (struct vdo_waiter *waiter , void *context );

💅 ARGUMENTS 💅

• waiter — the recovery journal block to write. That’s the main character of this function, periodt. 🎀
• context — not used. Not me expecting context and getting absolutely none, but okay, we respect it. 🙈

🦋 DESCRIPTION 🦋

This function implements waiter_callback_fn. That’s the whole description, bestie — short and slay. ✨

🌈 SEE ALSO 🌈

Okay so the SEE ALSO section is a whole friend group, and we’re listing every single one because nobody gets left behind. 💖

• Kernel file ./drivers/md/dm-vdo/recovery-journal.c Lock Counters.(9)
• get_zone_count_ptr(9)
• get_counter(9)
• is_journal_zone_locked(9)
• vdo_release_recovery_journal_block_reference(9)
• pop_free_list(9)
• is_block_dirty(9)
• is_block_empty(9)
• is_block_full(9)
• assert_on_journal_thread(9)
• continue_waiter(9)
• has_block_waiters(9)
• suspend_lock_counter(9)
• check_for_drain_complete(9)
• notify_recovery_journal_of_read_only_mode(9)
• enter_journal_read_only_mode(9)
• vdo_get_recovery_journal_current_sequence_number(9)
• get_recovery_journal_head(9)
• compute_recovery_count_byte(9)
• check_slab_journal_commit_threshold(9)
• finish_reaping(9)
• complete_reaping(9)
• handle_flush_error(9)
• initialize_journal_state(9)
• vdo_get_recovery_journal_length(9)
• reap_recovery_journal_callback(9)
• initialize_lock_counter(9)
• set_journal_tail(9)
• initialize_recovery_block(9)
• vdo_decode_recovery_journal(9)
• vdo_free_recovery_journal(9)
• vdo_initialize_recovery_journal_post_repair(9)
• vdo_get_journal_block_map_data_blocks_used(9)
• vdo_get_recovery_journal_thread_id(9)
• vdo_open_recovery_journal(9)
• vdo_record_recovery_journal(9)
• get_block_header(9)
• set_active_sector(9)
• advance_tail(9)
• initialize_lock_count(9)
• prepare_to_assign_entry(9)
• schedule_block_write(9)
• release_journal_block_reference(9)
• assign_entry(9)
• recycle_journal_block(9)
• continue_committed_waiter(9)
• notify_commit_waiters(9)
• recycle_journal_blocks(9)
• complete_write(9)
• add_queued_recovery_entries(9)
• write_blocks(9)
• vdo_add_recovery_journal_entry(9)
• is_lock_locked(9)
• reap_recovery_journal(9)
• vdo_acquire_recovery_journal_block_reference(9)
• vdo_release_journal_entry_lock(9)
• vdo_drain_recovery_journal(9)
• resume_lock_counter(9)
• vdo_resume_recovery_journal(9)
• vdo_get_recovery_journal_logical_blocks_used(9)
• vdo_get_recovery_journal_statistics(9)
• dump_recovery_block(9)
• vdo_dump_recovery_journal_statistics(9)

source/version + date, for the record: ./drivers/md/dm-vdo · October 2026 · write_block(9) — mwah, ty for reading bestie 🫶💖