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io_uring/kbuf: remove legacy kbuf caching

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Remove all struct io_buffer caches. It makes it a fair bit simpler.
Apart from from killing a bunch of lines and juggling between lists,
__io_put_kbuf_list() doesn't need ->completion_lock locking now.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/18287217466ee2576ea0b1e72daccf7b22c7e856.1738724373.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov
2025-02-05 11:36:46 +00:00
committed by Jens Axboe
parent dc39fb1093
commit 13ee854e7c
4 changed files with 9 additions and 58 deletions
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5
io_uring/kbuf.h
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@@ -166,8 +166,9 @@ static inline void __io_put_kbuf_list(struct io_kiocb *req, int len)
__io_put_kbuf_ring(req, len, 1);
} else {
req->buf_index = req->kbuf->bgid;
list_add(&req->kbuf->list, &req->ctx->io_buffers_comp);
req->flags &= ~REQ_F_BUFFER_SELECTED;
kfree(req->kbuf);
req->kbuf = NULL;
}
}
@@ -176,10 +177,8 @@ static inline void io_kbuf_drop(struct io_kiocb *req)
if (!(req->flags & (REQ_F_BUFFER_SELECTED|REQ_F_BUFFER_RING)))
return;
spin_lock(&req->ctx->completion_lock);
/* len == 0 is fine here, non-ring will always drop all of it */
__io_put_kbuf_list(req, 0);
spin_unlock(&req->ctx->completion_lock);
}
static inline unsigned int __io_put_kbufs(struct io_kiocb *req, int len,