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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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c0e9650521
The current situation with buffer group id juggling is not ideal. req->buf_index first stores the bgid, then it's overwritten by a buffer id, and then it can get restored back no recycling / etc. It's not so easy to control, and it's not handled consistently across request types with receive requests saving and restoring the bgid it by hand. It's a prep patch that adds a buffer group id argument to io_buffer_select(). The caller will be responsible for stashing a copy somewhere and passing it into the function. Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Link: https://lore.kernel.org/r/a210d6427cc3f4f42271a6853274cd5a50e56820.1743437358.git.asml.silence@gmail.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
53 lines
1.8 KiB
C
53 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/io_uring_types.h>
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#include <linux/pagemap.h>
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struct io_meta_state {
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u32 seed;
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struct iov_iter_state iter_meta;
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};
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struct io_async_rw {
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struct iou_vec vec;
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size_t bytes_done;
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struct_group(clear,
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struct iov_iter iter;
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struct iov_iter_state iter_state;
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struct iovec fast_iov;
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unsigned buf_group;
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/*
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* wpq is for buffered io, while meta fields are used with
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* direct io
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*/
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union {
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struct wait_page_queue wpq;
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struct {
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struct uio_meta meta;
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struct io_meta_state meta_state;
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};
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};
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);
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};
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int io_prep_read_fixed(struct io_kiocb *req, const struct io_uring_sqe *sqe);
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int io_prep_write_fixed(struct io_kiocb *req, const struct io_uring_sqe *sqe);
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int io_prep_readv_fixed(struct io_kiocb *req, const struct io_uring_sqe *sqe);
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int io_prep_writev_fixed(struct io_kiocb *req, const struct io_uring_sqe *sqe);
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int io_prep_readv(struct io_kiocb *req, const struct io_uring_sqe *sqe);
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int io_prep_writev(struct io_kiocb *req, const struct io_uring_sqe *sqe);
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int io_prep_read(struct io_kiocb *req, const struct io_uring_sqe *sqe);
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int io_prep_write(struct io_kiocb *req, const struct io_uring_sqe *sqe);
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int io_read(struct io_kiocb *req, unsigned int issue_flags);
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int io_write(struct io_kiocb *req, unsigned int issue_flags);
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int io_read_fixed(struct io_kiocb *req, unsigned int issue_flags);
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int io_write_fixed(struct io_kiocb *req, unsigned int issue_flags);
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void io_readv_writev_cleanup(struct io_kiocb *req);
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void io_rw_fail(struct io_kiocb *req);
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void io_req_rw_complete(struct io_kiocb *req, io_tw_token_t tw);
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int io_read_mshot_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
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int io_read_mshot(struct io_kiocb *req, unsigned int issue_flags);
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void io_rw_cache_free(const void *entry);
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