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