req_done(9)

req_done(9) 💖 Kernel API Manual 💖

okay bestie, gather round the group chat: we're in the Kernel API Manual and this page is literally about the callback that signals activity from the server. no cap, it's short but iconic.

✨ NAME ✨

req_done — callback which signals activity from the server. 💅

🦋 SYNOPSIS 🦋

void req_done (struct virtqueue *vq );

🎀 ARGUMENTS 🎀

• vq — the virtio queue where the activity was received. 🫶

💅 DESCRIPTION 💅

This notifies us that the server has triggered some activity on the virtio channel — most likely a response to a request we sent. The job: figure out which requests now have responses, and wake up those threads. periodt. ⭐

Bugs: could do with some additional sanity checking, but appears to work. 😭🙈

🌈 SEE ALSO 🌈

• kernel file ./net/9p/trans_virtio.c
• struct virtio_chan(9)
• p9_virtio_close(9)
• pack_sg_list(9)
• pack_sg_list_p(9)
• p9_virtio_request(9)
• p9_virtio_zc_request(9)
• p9_virtio_probe(9)
• p9_virtio_create(9)
• p9_virtio_remove(9)

xoxo 💋 from ./net/9p, October 2026 — req_done(9) signing off, slay. 🎀