Jens Axboe | e0da14d | 2022-05-25 06:12:18 -0600 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | #include <linux/kernel.h> |
| 3 | #include <linux/errno.h> |
| 4 | #include <linux/file.h> |
| 5 | #include <linux/io_uring.h> |
| 6 | |
| 7 | #include <uapi/linux/io_uring.h> |
| 8 | |
| 9 | #include "../fs/internal.h" |
| 10 | |
Jens Axboe | e0da14d | 2022-05-25 06:12:18 -0600 | [diff] [blame] | 11 | #include "io_uring.h" |
| 12 | #include "statx.h" |
| 13 | |
| 14 | struct io_statx { |
| 15 | struct file *file; |
| 16 | int dfd; |
| 17 | unsigned int mask; |
| 18 | unsigned int flags; |
| 19 | struct filename *filename; |
| 20 | struct statx __user *buffer; |
| 21 | }; |
| 22 | |
| 23 | int io_statx_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
| 24 | { |
Stefan Metzmacher | f2ccb5a | 2022-08-11 09:11:15 +0200 | [diff] [blame] | 25 | struct io_statx *sx = io_kiocb_to_cmd(req, struct io_statx); |
Jens Axboe | e0da14d | 2022-05-25 06:12:18 -0600 | [diff] [blame] | 26 | const char __user *path; |
| 27 | |
| 28 | if (sqe->buf_index || sqe->splice_fd_in) |
| 29 | return -EINVAL; |
| 30 | if (req->flags & REQ_F_FIXED_FILE) |
| 31 | return -EBADF; |
| 32 | |
| 33 | sx->dfd = READ_ONCE(sqe->fd); |
| 34 | sx->mask = READ_ONCE(sqe->len); |
| 35 | path = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
| 36 | sx->buffer = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
| 37 | sx->flags = READ_ONCE(sqe->statx_flags); |
| 38 | |
| 39 | sx->filename = getname_flags(path, |
| 40 | getname_statx_lookup_flags(sx->flags), |
| 41 | NULL); |
| 42 | |
| 43 | if (IS_ERR(sx->filename)) { |
| 44 | int ret = PTR_ERR(sx->filename); |
| 45 | |
| 46 | sx->filename = NULL; |
| 47 | return ret; |
| 48 | } |
| 49 | |
| 50 | req->flags |= REQ_F_NEED_CLEANUP; |
| 51 | return 0; |
| 52 | } |
| 53 | |
| 54 | int io_statx(struct io_kiocb *req, unsigned int issue_flags) |
| 55 | { |
Stefan Metzmacher | f2ccb5a | 2022-08-11 09:11:15 +0200 | [diff] [blame] | 56 | struct io_statx *sx = io_kiocb_to_cmd(req, struct io_statx); |
Jens Axboe | e0da14d | 2022-05-25 06:12:18 -0600 | [diff] [blame] | 57 | int ret; |
| 58 | |
| 59 | if (issue_flags & IO_URING_F_NONBLOCK) |
| 60 | return -EAGAIN; |
| 61 | |
| 62 | ret = do_statx(sx->dfd, sx->filename, sx->flags, sx->mask, sx->buffer); |
| 63 | io_req_set_res(req, ret, 0); |
| 64 | return IOU_OK; |
| 65 | } |
| 66 | |
| 67 | void io_statx_cleanup(struct io_kiocb *req) |
| 68 | { |
Stefan Metzmacher | f2ccb5a | 2022-08-11 09:11:15 +0200 | [diff] [blame] | 69 | struct io_statx *sx = io_kiocb_to_cmd(req, struct io_statx); |
Jens Axboe | e0da14d | 2022-05-25 06:12:18 -0600 | [diff] [blame] | 70 | |
| 71 | if (sx->filename) |
| 72 | putname(sx->filename); |
| 73 | } |