1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/kernel.h> 3 #include <linux/errno.h> 4 #include <linux/fs.h> 5 #include <linux/file.h> 6 #include <linux/io_uring.h> 7 8 #include <uapi/linux/io_uring.h> 9 10 #include "io_uring.h" 11 #include "rsrc.h" 12 #include "nop.h" 13 14 struct io_nop { 15 /* NOTE: kiocb has the file as the first member, so don't do it here */ 16 struct file *file; 17 int result; 18 int fd; 19 unsigned int flags; 20 __u64 extra1; 21 __u64 extra2; 22 }; 23 24 #define NOP_FLAGS (IORING_NOP_INJECT_RESULT | IORING_NOP_FIXED_FILE | \ 25 IORING_NOP_FIXED_BUFFER | IORING_NOP_FILE | \ 26 IORING_NOP_TW | IORING_NOP_CQE32) 27 28 int io_nop_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) 29 { 30 struct io_nop *nop = io_kiocb_to_cmd(req, struct io_nop); 31 32 nop->flags = READ_ONCE(sqe->nop_flags); 33 if (nop->flags & ~NOP_FLAGS) 34 return -EINVAL; 35 36 if (nop->flags & IORING_NOP_INJECT_RESULT) 37 nop->result = READ_ONCE(sqe->len); 38 else 39 nop->result = 0; 40 if (nop->flags & IORING_NOP_FILE) 41 nop->fd = READ_ONCE(sqe->fd); 42 else 43 nop->fd = -1; 44 if (nop->flags & IORING_NOP_FIXED_BUFFER) 45 req->buf_index = READ_ONCE(sqe->buf_index); 46 if (nop->flags & IORING_NOP_CQE32) { 47 struct io_ring_ctx *ctx = req->ctx; 48 49 if (!(ctx->flags & (IORING_SETUP_CQE32|IORING_SETUP_CQE_MIXED))) 50 return -EINVAL; 51 nop->extra1 = READ_ONCE(sqe->off); 52 nop->extra2 = READ_ONCE(sqe->addr); 53 } 54 return 0; 55 } 56 57 int io_nop(struct io_kiocb *req, unsigned int issue_flags) 58 { 59 struct io_nop *nop = io_kiocb_to_cmd(req, struct io_nop); 60 int ret = nop->result; 61 62 if (nop->flags & IORING_NOP_FILE) { 63 if (nop->flags & IORING_NOP_FIXED_FILE) { 64 req->file = io_file_get_fixed(req, nop->fd, issue_flags); 65 req->flags |= REQ_F_FIXED_FILE; 66 } else { 67 req->file = io_file_get_normal(req, nop->fd); 68 } 69 if (!req->file) { 70 ret = -EBADF; 71 goto done; 72 } 73 } 74 if (nop->flags & IORING_NOP_FIXED_BUFFER) { 75 if (!io_find_buf_node(req, issue_flags)) 76 ret = -EFAULT; 77 } 78 done: 79 if (ret < 0) 80 req_set_fail(req); 81 if (nop->flags & IORING_NOP_CQE32) 82 io_req_set_res32(req, nop->result, 0, nop->extra1, nop->extra2); 83 else 84 io_req_set_res(req, nop->result, 0); 85 if (nop->flags & IORING_NOP_TW) { 86 req->io_task_work.func = io_req_task_complete; 87 io_req_task_work_add(req); 88 return IOU_ISSUE_SKIP_COMPLETE; 89 } 90 return IOU_COMPLETE; 91 } 92