qdio_do_sqbs(9)

💅 qdio_do_sqbs — set buffer states for QEBSM ✨

okay so bestie, you're in the Kernel API Manual and this one's called qdio_do_sqbs(9) — it's a function that sets buffer states for QEBSM. lowkey iconic name, highkey niche function, we love a specialist 👑

---

🌸 SYNOPSIS 🌸

int qdio_do_sqbs (struct qdio_q *q , unsigned char state , int start ,
       int count );

that's the whole vibe right there. returns an int, takes four things. slay 🫶

---

🎀 ARGUMENTS 🎀

• q — the queue you're manipulating. this is your queue, the main character of the operation 💖
• state — the new state you're giving the buffers, typed as unsigned char. glow-up time ✨
• start — the first buffer number to change, i.e. where the makeover begins 🎬
• count — how many buffers to change. like, how many of them get the treatment 💅

---

🦋 DESCRIPTION 🦋

so what does it actually do? it returns the number of successfully changed buffers — that's the return value, that's the number you get back 🍓

and here's the part that ate: it does retrying until the specified count of buffer states is set or an error occurs. fr fr, it just keeps going at it — either it sets the whole count you asked for, or something errors out and it stops. no cap 😭

ngl this is the kind of function where the return value is doing a lot of the talking — you asked for count buffers, and you get told how many actually changed. keep an eye on that number bestie 👀

---

🌈 SEE ALSO 🌈

everyone in this function's group chat:

• Kernel file ./drivers/s390/cio/qdio_main.c do_siga_output(9)
• qdio_do_eqbs(9)
• qdio_get_ssqd_desc(9)
• qdio_shutdown(9)
• qdio_free(9)
• qdio_allocate(9)
• qdio_establish(9)
• qdio_activate(9)
• handle_inbound(9)
• qdio_add_bufs_to_input_queue(9)
• handle_outbound(9)
• qdio_add_bufs_to_output_queue(9)
• qdio_start_irq(9)
• qdio_stop_irq(9)

like, the whole friend group, periodt 🧚‍♀️

---

💫 cute sign-off 💫

this little beauty lives in ./drivers/s390/cio, and the page is dated October 2026. go forth and set those buffer states, bestie — iykyk 🔥👑💜