117 lines
3.4 KiB
C
117 lines
3.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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#ifndef _LINUX_IO_URING_CMD_H
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#define _LINUX_IO_URING_CMD_H
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#include <uapi/linux/io_uring.h>
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#include <linux/io_uring_types.h>
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/* only top 8 bits of sqe->uring_cmd_flags for kernel internal use */
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#define IORING_URING_CMD_CANCELABLE (1U << 30)
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struct io_uring_cmd {
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struct file *file;
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const struct io_uring_sqe *sqe;
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/* callback to defer completions to task context */
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void (*task_work_cb)(struct io_uring_cmd *cmd, unsigned);
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u32 cmd_op;
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u32 flags;
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u8 pdu[32]; /* available inline for free use */
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};
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static inline const void *io_uring_sqe_cmd(const struct io_uring_sqe *sqe)
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{
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return sqe->cmd;
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}
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static inline void io_uring_cmd_private_sz_check(size_t cmd_sz)
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{
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BUILD_BUG_ON(cmd_sz > sizeof_field(struct io_uring_cmd, pdu));
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}
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#define io_uring_cmd_to_pdu(cmd, pdu_type) ( \
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io_uring_cmd_private_sz_check(sizeof(pdu_type)), \
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((pdu_type *)&(cmd)->pdu) \
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)
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#if defined(CONFIG_IO_URING)
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int io_uring_cmd_import_fixed(u64 ubuf, unsigned long len, int rw,
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struct iov_iter *iter, void *ioucmd);
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/*
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* Completes the request, i.e. posts an io_uring CQE and deallocates @ioucmd
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* and the corresponding io_uring request.
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*
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* Note: the caller should never hard code @issue_flags and is only allowed
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* to pass the mask provided by the core io_uring code.
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*/
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void io_uring_cmd_done(struct io_uring_cmd *cmd, ssize_t ret, ssize_t res2,
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unsigned issue_flags);
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void __io_uring_cmd_do_in_task(struct io_uring_cmd *ioucmd,
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void (*task_work_cb)(struct io_uring_cmd *, unsigned),
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unsigned flags);
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/*
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* Note: the caller should never hard code @issue_flags and only use the
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* mask provided by the core io_uring code.
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*/
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void io_uring_cmd_mark_cancelable(struct io_uring_cmd *cmd,
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unsigned int issue_flags);
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/* Execute the request from a blocking context */
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void io_uring_cmd_issue_blocking(struct io_uring_cmd *ioucmd);
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#else
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static inline int io_uring_cmd_import_fixed(u64 ubuf, unsigned long len, int rw,
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struct iov_iter *iter, void *ioucmd)
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{
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return -EOPNOTSUPP;
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}
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static inline void io_uring_cmd_done(struct io_uring_cmd *cmd, ssize_t ret,
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ssize_t ret2, unsigned issue_flags)
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{
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}
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static inline void __io_uring_cmd_do_in_task(struct io_uring_cmd *ioucmd,
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void (*task_work_cb)(struct io_uring_cmd *, unsigned),
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unsigned flags)
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{
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}
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static inline void io_uring_cmd_mark_cancelable(struct io_uring_cmd *cmd,
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unsigned int issue_flags)
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{
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}
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static inline void io_uring_cmd_issue_blocking(struct io_uring_cmd *ioucmd)
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{
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}
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#endif
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/*
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* Polled completions must ensure they are coming from a poll queue, and
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* hence are completed inside the usual poll handling loops.
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*/
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static inline void io_uring_cmd_iopoll_done(struct io_uring_cmd *ioucmd,
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ssize_t ret, ssize_t res2)
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{
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lockdep_assert(in_task());
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io_uring_cmd_done(ioucmd, ret, res2, 0);
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}
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/* users must follow the IOU_F_TWQ_LAZY_WAKE semantics */
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static inline void io_uring_cmd_do_in_task_lazy(struct io_uring_cmd *ioucmd,
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void (*task_work_cb)(struct io_uring_cmd *, unsigned))
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{
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__io_uring_cmd_do_in_task(ioucmd, task_work_cb, IOU_F_TWQ_LAZY_WAKE);
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}
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static inline void io_uring_cmd_complete_in_task(struct io_uring_cmd *ioucmd,
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void (*task_work_cb)(struct io_uring_cmd *, unsigned))
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{
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__io_uring_cmd_do_in_task(ioucmd, task_work_cb, 0);
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}
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static inline struct task_struct *io_uring_cmd_get_task(struct io_uring_cmd *cmd)
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{
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return cmd_to_io_kiocb(cmd)->task;
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}
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#endif /* _LINUX_IO_URING_CMD_H */
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