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https://github.com/torvalds/linux
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53ccf69bda
io_put_kbuf() is huge, don't bloat the kernel with inlining. Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Link: https://lore.kernel.org/r/2e21ccf0be471ffa654032914b9430813cae53f8.1655371007.git.asml.silence@gmail.com Reviewed-by: Hao Xu <howeyxu@tencent.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
117 lines
3.2 KiB
C
117 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#ifndef IOU_KBUF_H
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#define IOU_KBUF_H
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#include <uapi/linux/io_uring.h>
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struct io_buffer_list {
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/*
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* If ->buf_nr_pages is set, then buf_pages/buf_ring are used. If not,
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* then these are classic provided buffers and ->buf_list is used.
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*/
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union {
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struct list_head buf_list;
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struct {
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struct page **buf_pages;
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struct io_uring_buf_ring *buf_ring;
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};
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};
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__u16 bgid;
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/* below is for ring provided buffers */
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__u16 buf_nr_pages;
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__u16 nr_entries;
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__u16 head;
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__u16 mask;
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};
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struct io_buffer {
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struct list_head list;
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__u64 addr;
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__u32 len;
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__u16 bid;
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__u16 bgid;
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};
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void __user *io_buffer_select(struct io_kiocb *req, size_t *len,
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unsigned int issue_flags);
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void __io_kbuf_recycle(struct io_kiocb *req, unsigned issue_flags);
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void io_destroy_buffers(struct io_ring_ctx *ctx);
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int io_remove_buffers_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
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int io_remove_buffers(struct io_kiocb *req, unsigned int issue_flags);
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int io_provide_buffers_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
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int io_provide_buffers(struct io_kiocb *req, unsigned int issue_flags);
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int io_register_pbuf_ring(struct io_ring_ctx *ctx, void __user *arg);
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int io_unregister_pbuf_ring(struct io_ring_ctx *ctx, void __user *arg);
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unsigned int __io_put_kbuf(struct io_kiocb *req, unsigned issue_flags);
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static inline bool io_do_buffer_select(struct io_kiocb *req)
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{
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if (!(req->flags & REQ_F_BUFFER_SELECT))
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return false;
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return !(req->flags & (REQ_F_BUFFER_SELECTED|REQ_F_BUFFER_RING));
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}
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static inline void io_kbuf_recycle(struct io_kiocb *req, unsigned issue_flags)
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{
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if (!(req->flags & (REQ_F_BUFFER_SELECTED|REQ_F_BUFFER_RING)))
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return;
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/*
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* For legacy provided buffer mode, don't recycle if we already did
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* IO to this buffer. For ring-mapped provided buffer mode, we should
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* increment ring->head to explicitly monopolize the buffer to avoid
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* multiple use.
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*/
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if ((req->flags & REQ_F_BUFFER_SELECTED) &&
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(req->flags & REQ_F_PARTIAL_IO))
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return;
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/*
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* READV uses fields in `struct io_rw` (len/addr) to stash the selected
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* buffer data. However if that buffer is recycled the original request
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* data stored in addr is lost. Therefore forbid recycling for now.
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*/
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if (req->opcode == IORING_OP_READV)
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return;
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__io_kbuf_recycle(req, issue_flags);
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}
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static inline unsigned int __io_put_kbuf_list(struct io_kiocb *req,
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struct list_head *list)
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{
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if (req->flags & REQ_F_BUFFER_RING) {
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if (req->buf_list)
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req->buf_list->head++;
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req->flags &= ~REQ_F_BUFFER_RING;
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} else {
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list_add(&req->kbuf->list, list);
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req->flags &= ~REQ_F_BUFFER_SELECTED;
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}
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return IORING_CQE_F_BUFFER | (req->buf_index << IORING_CQE_BUFFER_SHIFT);
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}
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static inline unsigned int io_put_kbuf_comp(struct io_kiocb *req)
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{
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lockdep_assert_held(&req->ctx->completion_lock);
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if (!(req->flags & (REQ_F_BUFFER_SELECTED|REQ_F_BUFFER_RING)))
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return 0;
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return __io_put_kbuf_list(req, &req->ctx->io_buffers_comp);
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}
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static inline unsigned int io_put_kbuf(struct io_kiocb *req,
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unsigned issue_flags)
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{
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if (!(req->flags & (REQ_F_BUFFER_SELECTED|REQ_F_BUFFER_RING)))
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return 0;
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return __io_put_kbuf(req, issue_flags);
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}
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#endif
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