| 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/namei.h> |
| 9 | #include <linux/io_uring.h> |
| 10 | #include <linux/fsnotify.h> |
| 11 | |
| 12 | #include <uapi/linux/io_uring.h> |
| 13 | |
| 14 | #include "io_uring.h" |
| 15 | #include "sync.h" |
| 16 | |
| 17 | struct io_sync { |
| 18 | struct file *file; |
| 19 | loff_t len; |
| 20 | loff_t off; |
| 21 | int flags; |
| 22 | int mode; |
| 23 | }; |
| 24 | |
| 25 | int io_sfr_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
| 26 | { |
| 27 | struct io_sync *sync = io_kiocb_to_cmd(req, struct io_sync); |
| 28 | |
| 29 | if (unlikely(sqe->addr || sqe->buf_index || sqe->splice_fd_in)) |
| 30 | return -EINVAL; |
| 31 | |
| 32 | sync->off = READ_ONCE(sqe->off); |
| 33 | sync->len = READ_ONCE(sqe->len); |
| 34 | sync->flags = READ_ONCE(sqe->sync_range_flags); |
| 35 | req->flags |= REQ_F_FORCE_ASYNC; |
| 36 | |
| 37 | return 0; |
| 38 | } |
| 39 | |
| 40 | int io_sync_file_range(struct io_kiocb *req, unsigned int issue_flags) |
| 41 | { |
| 42 | struct io_sync *sync = io_kiocb_to_cmd(req, struct io_sync); |
| 43 | int ret; |
| 44 | |
| 45 | /* sync_file_range always requires a blocking context */ |
| 46 | WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK); |
| 47 | |
| 48 | ret = sync_file_range(req->file, sync->off, sync->len, sync->flags); |
| 49 | io_req_set_res(req, ret, 0); |
| 50 | return IOU_OK; |
| 51 | } |
| 52 | |
| 53 | int io_fsync_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
| 54 | { |
| 55 | struct io_sync *sync = io_kiocb_to_cmd(req, struct io_sync); |
| 56 | |
| 57 | if (unlikely(sqe->addr || sqe->buf_index || sqe->splice_fd_in)) |
| 58 | return -EINVAL; |
| 59 | |
| 60 | sync->flags = READ_ONCE(sqe->fsync_flags); |
| 61 | if (unlikely(sync->flags & ~IORING_FSYNC_DATASYNC)) |
| 62 | return -EINVAL; |
| 63 | |
| 64 | sync->off = READ_ONCE(sqe->off); |
| 65 | sync->len = READ_ONCE(sqe->len); |
| 66 | req->flags |= REQ_F_FORCE_ASYNC; |
| 67 | return 0; |
| 68 | } |
| 69 | |
| 70 | int io_fsync(struct io_kiocb *req, unsigned int issue_flags) |
| 71 | { |
| 72 | struct io_sync *sync = io_kiocb_to_cmd(req, struct io_sync); |
| 73 | loff_t end = sync->off + sync->len; |
| 74 | int ret; |
| 75 | |
| 76 | /* fsync always requires a blocking context */ |
| 77 | WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK); |
| 78 | |
| 79 | ret = vfs_fsync_range(req->file, sync->off, end > 0 ? end : LLONG_MAX, |
| 80 | sync->flags & IORING_FSYNC_DATASYNC); |
| 81 | io_req_set_res(req, ret, 0); |
| 82 | return IOU_OK; |
| 83 | } |
| 84 | |
| 85 | int io_fallocate_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
| 86 | { |
| 87 | struct io_sync *sync = io_kiocb_to_cmd(req, struct io_sync); |
| 88 | |
| 89 | if (sqe->buf_index || sqe->rw_flags || sqe->splice_fd_in) |
| 90 | return -EINVAL; |
| 91 | |
| 92 | sync->off = READ_ONCE(sqe->off); |
| 93 | sync->len = READ_ONCE(sqe->addr); |
| 94 | sync->mode = READ_ONCE(sqe->len); |
| 95 | req->flags |= REQ_F_FORCE_ASYNC; |
| 96 | return 0; |
| 97 | } |
| 98 | |
| 99 | int io_fallocate(struct io_kiocb *req, unsigned int issue_flags) |
| 100 | { |
| 101 | struct io_sync *sync = io_kiocb_to_cmd(req, struct io_sync); |
| 102 | int ret; |
| 103 | |
| 104 | /* fallocate always requiring blocking context */ |
| 105 | WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK); |
| 106 | |
| 107 | ret = vfs_fallocate(req->file, sync->mode, sync->off, sync->len); |
| 108 | if (ret >= 0) |
| 109 | fsnotify_modify(req->file); |
| 110 | io_req_set_res(req, ret, 0); |
| 111 | return IOU_OK; |
| 112 | } |