1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 #ifndef _LINUX_IO_URING_CMD_H 3 #define _LINUX_IO_URING_CMD_H 4 5 #include <uapi/linux/io_uring.h> 6 #include <linux/io_uring_types.h> 7 8 /* only top 8 bits of sqe->uring_cmd_flags for kernel internal use */ 9 #define IORING_URING_CMD_CANCELABLE (1U << 30) 10 11 struct io_uring_cmd { 12 struct file *file; 13 const struct io_uring_sqe *sqe; 14 /* callback to defer completions to task context */ 15 void (*task_work_cb)(struct io_uring_cmd *cmd, unsigned); 16 u32 cmd_op; 17 u32 flags; 18 u8 pdu[32]; /* available inline for free use */ 19 }; 20 21 static inline const void *io_uring_sqe_cmd(const struct io_uring_sqe *sqe) 22 { 23 return sqe->cmd; 24 } 25 26 static inline void io_uring_cmd_private_sz_check(size_t cmd_sz) 27 { 28 BUILD_BUG_ON(cmd_sz > sizeof_field(struct io_uring_cmd, pdu)); 29 } 30 #define io_uring_cmd_to_pdu(cmd, pdu_type) ( \ 31 io_uring_cmd_private_sz_check(sizeof(pdu_type)), \ 32 ((pdu_type *)&(cmd)->pdu) \ 33 ) 34 35 #if defined(CONFIG_IO_URING) 36 int io_uring_cmd_import_fixed(u64 ubuf, unsigned long len, int rw, 37 struct iov_iter *iter, void *ioucmd); 38 39 /* 40 * Completes the request, i.e. posts an io_uring CQE and deallocates @ioucmd 41 * and the corresponding io_uring request. 42 * 43 * Note: the caller should never hard code @issue_flags and is only allowed 44 * to pass the mask provided by the core io_uring code. 45 */ 46 void io_uring_cmd_done(struct io_uring_cmd *cmd, ssize_t ret, ssize_t res2, 47 unsigned issue_flags); 48 49 void __io_uring_cmd_do_in_task(struct io_uring_cmd *ioucmd, 50 void (*task_work_cb)(struct io_uring_cmd *, unsigned), 51 unsigned flags); 52 53 /* 54 * Note: the caller should never hard code @issue_flags and only use the 55 * mask provided by the core io_uring code. 56 */ 57 void io_uring_cmd_mark_cancelable(struct io_uring_cmd *cmd, 58 unsigned int issue_flags); 59 60 /* Execute the request from a blocking context */ 61 void io_uring_cmd_issue_blocking(struct io_uring_cmd *ioucmd); 62 63 #else 64 static inline int io_uring_cmd_import_fixed(u64 ubuf, unsigned long len, int rw, 65 struct iov_iter *iter, void *ioucmd) 66 { 67 return -EOPNOTSUPP; 68 } 69 static inline void io_uring_cmd_done(struct io_uring_cmd *cmd, ssize_t ret, 70 ssize_t ret2, unsigned issue_flags) 71 { 72 } 73 static inline void __io_uring_cmd_do_in_task(struct io_uring_cmd *ioucmd, 74 void (*task_work_cb)(struct io_uring_cmd *, unsigned), 75 unsigned flags) 76 { 77 } 78 static inline void io_uring_cmd_mark_cancelable(struct io_uring_cmd *cmd, 79 unsigned int issue_flags) 80 { 81 } 82 static inline void io_uring_cmd_issue_blocking(struct io_uring_cmd *ioucmd) 83 { 84 } 85 #endif 86 87 /* 88 * Polled completions must ensure they are coming from a poll queue, and 89 * hence are completed inside the usual poll handling loops. 90 */ 91 static inline void io_uring_cmd_iopoll_done(struct io_uring_cmd *ioucmd, 92 ssize_t ret, ssize_t res2) 93 { 94 lockdep_assert(in_task()); 95 io_uring_cmd_done(ioucmd, ret, res2, 0); 96 } 97 98 /* users must follow the IOU_F_TWQ_LAZY_WAKE semantics */ 99 static inline void io_uring_cmd_do_in_task_lazy(struct io_uring_cmd *ioucmd, 100 void (*task_work_cb)(struct io_uring_cmd *, unsigned)) 101 { 102 __io_uring_cmd_do_in_task(ioucmd, task_work_cb, IOU_F_TWQ_LAZY_WAKE); 103 } 104 105 static inline void io_uring_cmd_complete_in_task(struct io_uring_cmd *ioucmd, 106 void (*task_work_cb)(struct io_uring_cmd *, unsigned)) 107 { 108 __io_uring_cmd_do_in_task(ioucmd, task_work_cb, 0); 109 } 110 111 static inline struct task_struct *io_uring_cmd_get_task(struct io_uring_cmd *cmd) 112 { 113 return cmd_to_io_kiocb(cmd)->tctx->task; 114 } 115 116 #endif /* _LINUX_IO_URING_CMD_H */ 117