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 }; 21 22 #define NOP_FLAGS (IORING_NOP_INJECT_RESULT | IORING_NOP_FIXED_FILE | \ 23 IORING_NOP_FIXED_BUFFER | IORING_NOP_FILE | \ 24 IORING_NOP_TW) 25 26 int io_nop_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) 27 { 28 struct io_nop *nop = io_kiocb_to_cmd(req, struct io_nop); 29 30 nop->flags = READ_ONCE(sqe->nop_flags); 31 if (nop->flags & ~NOP_FLAGS) 32 return -EINVAL; 33 34 if (nop->flags & IORING_NOP_INJECT_RESULT) 35 nop->result = READ_ONCE(sqe->len); 36 else 37 nop->result = 0; 38 if (nop->flags & IORING_NOP_FILE) 39 nop->fd = READ_ONCE(sqe->fd); 40 else 41 nop->fd = -1; 42 if (nop->flags & IORING_NOP_FIXED_BUFFER) 43 req->buf_index = READ_ONCE(sqe->buf_index); 44 return 0; 45 } 46 47 int io_nop(struct io_kiocb *req, unsigned int issue_flags) 48 { 49 struct io_nop *nop = io_kiocb_to_cmd(req, struct io_nop); 50 int ret = nop->result; 51 52 if (nop->flags & IORING_NOP_FILE) { 53 if (nop->flags & IORING_NOP_FIXED_FILE) { 54 req->file = io_file_get_fixed(req, nop->fd, issue_flags); 55 req->flags |= REQ_F_FIXED_FILE; 56 } else { 57 req->file = io_file_get_normal(req, nop->fd); 58 } 59 if (!req->file) { 60 ret = -EBADF; 61 goto done; 62 } 63 } 64 if (nop->flags & IORING_NOP_FIXED_BUFFER) { 65 if (!io_find_buf_node(req, issue_flags)) 66 ret = -EFAULT; 67 } 68 done: 69 if (ret < 0) 70 req_set_fail(req); 71 io_req_set_res(req, nop->result, 0); 72 if (nop->flags & IORING_NOP_TW) { 73 req->io_task_work.func = io_req_task_complete; 74 io_req_task_work_add(req); 75 return IOU_ISSUE_SKIP_COMPLETE; 76 } 77 return IOU_COMPLETE; 78 } 79