| Quellcodebibliothek Statistik Leitseite products/sources/formale Sprachen/C/Linux/io_uring/ (Open Source Betriebssystem Version 6.17.9©) Datei vom 24.10.2025 mit Größe 3 kB |
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Quelle kbuf.h Sprache: C |
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// SPDX-License-Identifier: GPL-2.0
#ifndef IOU_KBUF_H #define IOU_KBUF_H #include <uapi/linux/io_uring.h> #include <linux/io_uring_types.h> enum { /* ring mapped provided buffers */ IOBL_BUF_RING = 1, /* buffers are consumed incrementally rather than always fully */ IOBL_INC = 2, }; struct io_buffer_list { /* * If ->buf_nr_pages is set, then buf_pages/buf_ring are used. If not, * then these are classic provided buffers and ->buf_list is used. */ union { struct list_head buf_list; struct io_uring_buf_ring *buf_ring; }; /* count of classic/legacy buffers in buffer list */ int nbufs; __u16 bgid; /* below is for ring provided buffers */ __u16 buf_nr_pages; __u16 nr_entries; __u16 head; __u16 mask; __u16 flags; struct io_mapped_region region; }; struct io_buffer { struct list_head list; __u64 addr; __u32 len; __u16 bid; __u16 bgid; }; enum { /* can alloc a bigger vec */ KBUF_MODE_EXPAND = 1, /* if bigger vec allocated, free old one */ KBUF_MODE_FREE = 2, }; struct buf_sel_arg { struct iovec *iovs; size_t out_len; size_t max_len; unsigned short nr_iovs; unsigned short mode; unsigned short buf_group; unsigned short partial_map; }; void __user *io_buffer_select(struct io_kiocb *req, size_t *len, unsigned buf_group, unsigned int issue_flags); int io_buffers_select(struct io_kiocb *req, struct buf_sel_arg *arg, unsigned int issue_flags); int io_buffers_peek(struct io_kiocb *req, struct buf_sel_arg *arg); void io_destroy_buffers(struct io_ring_ctx *ctx); int io_remove_buffers_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe); int io_provide_buffers_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe); int io_manage_buffers_legacy(struct io_kiocb *req, unsigned int issue_flags); int io_register_pbuf_ring(struct io_ring_ctx *ctx, void __user *arg); int io_unregister_pbuf_ring(struct io_ring_ctx *ctx, void __user *arg); int io_register_pbuf_status(struct io_ring_ctx *ctx, void __user *arg); bool io_kbuf_recycle_legacy(struct io_kiocb *req, unsigned issue_flags); void io_kbuf_drop_legacy(struct io_kiocb *req); unsigned int __io_put_kbufs(struct io_kiocb *req, int len, int nbufs); bool io_kbuf_commit(struct io_kiocb *req, struct io_buffer_list *bl, int len, int nr); struct io_mapped_region *io_pbuf_get_region(struct io_ring_ctx *ctx, unsigned int bgid); static inline bool io_kbuf_recycle_ring(struct io_kiocb *req) { /* * We don't need to recycle for REQ_F_BUFFER_RING, we can just clear * the flag and hence ensure that bl->head doesn't get incremented. * If the tail has already been incremented, hang on to it. * The exception is partial io, that case we should increment bl->head * to monopolize the buffer. */ if (req->buf_list) { req->flags &= ~(REQ_F_BUFFER_RING|REQ_F_BUFFERS_COMMIT); return true; } return false; } static inline bool io_do_buffer_select(struct io_kiocb *req) { if (!(req->flags & REQ_F_BUFFER_SELECT)) return false; return !(req->flags & (REQ_F_BUFFER_SELECTED|REQ_F_BUFFER_RING)); } static inline bool io_kbuf_recycle(struct io_kiocb *req, unsigned issue_flags) { if (req->flags & REQ_F_BL_NO_RECYCLE) return false; if (req->flags & REQ_F_BUFFER_SELECTED) return io_kbuf_recycle_legacy(req, issue_flags); if (req->flags & REQ_F_BUFFER_RING) return io_kbuf_recycle_ring(req); return false; } static inline unsigned int io_put_kbuf(struct io_kiocb *req, int len, unsigned issue_flags) { if (!(req->flags & (REQ_F_BUFFER_RING | REQ_F_BUFFER_SELECTED))) return 0; return __io_put_kbufs(req, len, 1); } static inline unsigned int io_put_kbufs(struct io_kiocb *req, int len, int nbufs, unsigned issue_flags) { if (!(req->flags & (REQ_F_BUFFER_RING | REQ_F_BUFFER_SELECTED))) return 0; return __io_put_kbufs(req, len, nbufs); } #endif ¤ Dauer der Verarbeitung: 0.13 Sekunden (vorverarbeitet) ¤*© Formatika GbR, Deutschland |
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2026-03-28