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/mm.h> 7 #include <linux/slab.h> 8 #include <linux/syscalls.h> 9 #include <linux/io_uring.h> 10 11 #include <uapi/linux/io_uring.h> 12 13 #include "../fs/internal.h" 14 15 #include "io_uring.h" 16 #include "truncate.h" 17 18 struct io_ftrunc { 19 struct file *file; 20 loff_t len; 21 }; 22 23 int io_ftruncate_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) 24 { 25 struct io_ftrunc *ft = io_kiocb_to_cmd(req, struct io_ftrunc); 26 27 if (sqe->rw_flags || sqe->addr || sqe->len || sqe->buf_index || 28 sqe->splice_fd_in || sqe->addr3) 29 return -EINVAL; 30 31 ft->len = READ_ONCE(sqe->off); 32 33 req->flags |= REQ_F_FORCE_ASYNC; 34 return 0; 35 } 36 37 int io_ftruncate(struct io_kiocb *req, unsigned int issue_flags) 38 { 39 struct io_ftrunc *ft = io_kiocb_to_cmd(req, struct io_ftrunc); 40 int ret; 41 42 WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK); 43 44 ret = do_ftruncate(req->file, ft->len, 1); 45 46 io_req_set_res(req, ret, 0); 47 return IOU_OK; 48 } 49