tl_release(9)

💅 tl_release(9) — from the Kernel API Manual, bestie 🎀

okay so picture this: you're deep in the DRBD kernel API Manual and you land on tl_release — literally the function that goes "yep, all acked, we're good" on a whole transfer log epoch ✨

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🌸 NAME 🌸

tl_release — marks all the requests in the corresponding transfer log epoch as BARRIER_ACKED, no cap, every single one 👑

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🦋 SYNOPSIS 🦋

void tl_release (struct drbd_connection *connection , unsigned int
barrier_nr , unsigned int set_size );

that's the whole signature, copied exactly, we don't do typos here 💅

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💖 ARGUMENTS 💖

• connection — the DRBD connection. your main character struct fr 🫶
• barrier_nr — the expected identifier of the DRBD write barrier packet. expected being the key word 👀
• set_size — the expected number of requests that came before that barrier. also expected. also key 👀

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🔥 DESCRIPTION 🔥

so here's the vibe check: if the barrier_nr or set_size you passed in does not match the oldest epoch of not-yet-barrier-acked requests, this function will cause a termination of the connection 💀

like, it's not a warning, it's not a "try again" — it straight up terminates the connection. so double-check your numbers before you call this, i'm begging 🙈

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🌈 SEE ALSO 🌈

kernel file ./drivers/block/drbd/drbd_main.c and its whole friend group, all of these:

• _tl_restart(9)
• tl_clear(9)
• tl_abort_disk_io(9)
• drbd_thread_current_set_cpu(9)
• drbd_send_current_state(9)
• drbd_send_state(9)
• _drbd_send_ack(9)
• drbd_send_ack(9)
• drbd_md_sync(9)
• drbd_md_read(9)
• drbd_md_mark_dirty(9)
• drbd_uuid_new_current(9)
• drbd_bmio_set_n_write(9)
• drbd_bmio_clear_n_write(9)
• drbd_queue_bitmap_io(9)
• drbd_bitmap_io(9)
• drbd_wait_misc(9)

go read them, iykyk 📚💜

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⭐ reminder bestie: mismatch the barrier → connection terminated. that's the whole mood of this page. slay responsibly 🎀

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and that's a wrap on tl_release(9)!! brought to you by ./drivers/block/drbd, dated October 2026 — see you in the next epoch, mwah 😭💖🧚