p9_virtio_zc_request(9)

💅 p9_virtio_zc_request 💅

okay so bestie, welcome to the Kernel API Manual ✨ — this little cutie lives in p9_virtio_zc_request(9) and honestly? it's giving zero copy realness. let's get into it 🫶

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✨ NAME ✨

p9_virtio_zc_request — issue a zero copy request 💫

like, the whole point is you're issuing a request and nobody's copying your buffers around. iconic behavior only 👑

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🌸 SYNOPSIS 🌸

int p9_virtio_zc_request (struct p9_client *client , struct p9_req_t
*req , struct iov_iter *uidata , struct iov_iter *uodata , int inlen ,
int outlen , int in_hdr_len );

copy it exactly, bestie, don't be cute with it 😭

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🎀 ARGUMENTS 🎀

• client — the client instance that's issuing the request. main character of this whole operation fr fr 💖
• req — the request that's actually getting issued. yes, this one, the one you brought 🦋
• uidata — user buffer that should be used for zero copy read 👀✨ no copying, we said what we said
• uodata — user buffer that should be used for zero copy write ✍️💫 also no copying, keep up
• inlen — read buffer size. the length of the read situation 📏
• outlen — write buffer size. the length of the write situation 📐
• in_hdr_len — reader header size; this is the size of the response protocol data 🧚 lowkey important, don't skip it

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🌈 SEE ALSO 🌈

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

like a little friend group of functions, we love a linked list of besties 🫶💜

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ngl bestie, this page is short and sweet — but every arg matters, so don't go forgetting your in_hdr_len on the way out 🙈

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and that's the whole vibe check 💅 this one's from ./net/9p, dated October 2026, and it's filed right back under p9_virtio_zc_request(9) — periodt 🎀✨🌸