Merge tag 'drm-intel-next-fixes-2022-08-11' of git://anongit.freedesktop.org/drm...
[platform/kernel/linux-starfive.git] / io_uring / fs.c
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
11 #include <uapi/linux/io_uring.h>
12
13 #include "../fs/internal.h"
14
15 #include "io_uring.h"
16 #include "fs.h"
17
18 struct io_rename {
19         struct file                     *file;
20         int                             old_dfd;
21         int                             new_dfd;
22         struct filename                 *oldpath;
23         struct filename                 *newpath;
24         int                             flags;
25 };
26
27 struct io_unlink {
28         struct file                     *file;
29         int                             dfd;
30         int                             flags;
31         struct filename                 *filename;
32 };
33
34 struct io_mkdir {
35         struct file                     *file;
36         int                             dfd;
37         umode_t                         mode;
38         struct filename                 *filename;
39 };
40
41 struct io_link {
42         struct file                     *file;
43         int                             old_dfd;
44         int                             new_dfd;
45         struct filename                 *oldpath;
46         struct filename                 *newpath;
47         int                             flags;
48 };
49
50 int io_renameat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
51 {
52         struct io_rename *ren = io_kiocb_to_cmd(req, struct io_rename);
53         const char __user *oldf, *newf;
54
55         if (sqe->buf_index || sqe->splice_fd_in)
56                 return -EINVAL;
57         if (unlikely(req->flags & REQ_F_FIXED_FILE))
58                 return -EBADF;
59
60         ren->old_dfd = READ_ONCE(sqe->fd);
61         oldf = u64_to_user_ptr(READ_ONCE(sqe->addr));
62         newf = u64_to_user_ptr(READ_ONCE(sqe->addr2));
63         ren->new_dfd = READ_ONCE(sqe->len);
64         ren->flags = READ_ONCE(sqe->rename_flags);
65
66         ren->oldpath = getname(oldf);
67         if (IS_ERR(ren->oldpath))
68                 return PTR_ERR(ren->oldpath);
69
70         ren->newpath = getname(newf);
71         if (IS_ERR(ren->newpath)) {
72                 putname(ren->oldpath);
73                 return PTR_ERR(ren->newpath);
74         }
75
76         req->flags |= REQ_F_NEED_CLEANUP;
77         return 0;
78 }
79
80 int io_renameat(struct io_kiocb *req, unsigned int issue_flags)
81 {
82         struct io_rename *ren = io_kiocb_to_cmd(req, struct io_rename);
83         int ret;
84
85         if (issue_flags & IO_URING_F_NONBLOCK)
86                 return -EAGAIN;
87
88         ret = do_renameat2(ren->old_dfd, ren->oldpath, ren->new_dfd,
89                                 ren->newpath, ren->flags);
90
91         req->flags &= ~REQ_F_NEED_CLEANUP;
92         io_req_set_res(req, ret, 0);
93         return IOU_OK;
94 }
95
96 void io_renameat_cleanup(struct io_kiocb *req)
97 {
98         struct io_rename *ren = io_kiocb_to_cmd(req, struct io_rename);
99
100         putname(ren->oldpath);
101         putname(ren->newpath);
102 }
103
104 int io_unlinkat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
105 {
106         struct io_unlink *un = io_kiocb_to_cmd(req, struct io_unlink);
107         const char __user *fname;
108
109         if (sqe->off || sqe->len || sqe->buf_index || sqe->splice_fd_in)
110                 return -EINVAL;
111         if (unlikely(req->flags & REQ_F_FIXED_FILE))
112                 return -EBADF;
113
114         un->dfd = READ_ONCE(sqe->fd);
115
116         un->flags = READ_ONCE(sqe->unlink_flags);
117         if (un->flags & ~AT_REMOVEDIR)
118                 return -EINVAL;
119
120         fname = u64_to_user_ptr(READ_ONCE(sqe->addr));
121         un->filename = getname(fname);
122         if (IS_ERR(un->filename))
123                 return PTR_ERR(un->filename);
124
125         req->flags |= REQ_F_NEED_CLEANUP;
126         return 0;
127 }
128
129 int io_unlinkat(struct io_kiocb *req, unsigned int issue_flags)
130 {
131         struct io_unlink *un = io_kiocb_to_cmd(req, struct io_unlink);
132         int ret;
133
134         if (issue_flags & IO_URING_F_NONBLOCK)
135                 return -EAGAIN;
136
137         if (un->flags & AT_REMOVEDIR)
138                 ret = do_rmdir(un->dfd, un->filename);
139         else
140                 ret = do_unlinkat(un->dfd, un->filename);
141
142         req->flags &= ~REQ_F_NEED_CLEANUP;
143         io_req_set_res(req, ret, 0);
144         return IOU_OK;
145 }
146
147 void io_unlinkat_cleanup(struct io_kiocb *req)
148 {
149         struct io_unlink *ul = io_kiocb_to_cmd(req, struct io_unlink);
150
151         putname(ul->filename);
152 }
153
154 int io_mkdirat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
155 {
156         struct io_mkdir *mkd = io_kiocb_to_cmd(req, struct io_mkdir);
157         const char __user *fname;
158
159         if (sqe->off || sqe->rw_flags || sqe->buf_index || sqe->splice_fd_in)
160                 return -EINVAL;
161         if (unlikely(req->flags & REQ_F_FIXED_FILE))
162                 return -EBADF;
163
164         mkd->dfd = READ_ONCE(sqe->fd);
165         mkd->mode = READ_ONCE(sqe->len);
166
167         fname = u64_to_user_ptr(READ_ONCE(sqe->addr));
168         mkd->filename = getname(fname);
169         if (IS_ERR(mkd->filename))
170                 return PTR_ERR(mkd->filename);
171
172         req->flags |= REQ_F_NEED_CLEANUP;
173         return 0;
174 }
175
176 int io_mkdirat(struct io_kiocb *req, unsigned int issue_flags)
177 {
178         struct io_mkdir *mkd = io_kiocb_to_cmd(req, struct io_mkdir);
179         int ret;
180
181         if (issue_flags & IO_URING_F_NONBLOCK)
182                 return -EAGAIN;
183
184         ret = do_mkdirat(mkd->dfd, mkd->filename, mkd->mode);
185
186         req->flags &= ~REQ_F_NEED_CLEANUP;
187         io_req_set_res(req, ret, 0);
188         return IOU_OK;
189 }
190
191 void io_mkdirat_cleanup(struct io_kiocb *req)
192 {
193         struct io_mkdir *md = io_kiocb_to_cmd(req, struct io_mkdir);
194
195         putname(md->filename);
196 }
197
198 int io_symlinkat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
199 {
200         struct io_link *sl = io_kiocb_to_cmd(req, struct io_link);
201         const char __user *oldpath, *newpath;
202
203         if (sqe->len || sqe->rw_flags || sqe->buf_index || sqe->splice_fd_in)
204                 return -EINVAL;
205         if (unlikely(req->flags & REQ_F_FIXED_FILE))
206                 return -EBADF;
207
208         sl->new_dfd = READ_ONCE(sqe->fd);
209         oldpath = u64_to_user_ptr(READ_ONCE(sqe->addr));
210         newpath = u64_to_user_ptr(READ_ONCE(sqe->addr2));
211
212         sl->oldpath = getname(oldpath);
213         if (IS_ERR(sl->oldpath))
214                 return PTR_ERR(sl->oldpath);
215
216         sl->newpath = getname(newpath);
217         if (IS_ERR(sl->newpath)) {
218                 putname(sl->oldpath);
219                 return PTR_ERR(sl->newpath);
220         }
221
222         req->flags |= REQ_F_NEED_CLEANUP;
223         return 0;
224 }
225
226 int io_symlinkat(struct io_kiocb *req, unsigned int issue_flags)
227 {
228         struct io_link *sl = io_kiocb_to_cmd(req, struct io_link);
229         int ret;
230
231         if (issue_flags & IO_URING_F_NONBLOCK)
232                 return -EAGAIN;
233
234         ret = do_symlinkat(sl->oldpath, sl->new_dfd, sl->newpath);
235
236         req->flags &= ~REQ_F_NEED_CLEANUP;
237         io_req_set_res(req, ret, 0);
238         return IOU_OK;
239 }
240
241 int io_linkat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
242 {
243         struct io_link *lnk = io_kiocb_to_cmd(req, struct io_link);
244         const char __user *oldf, *newf;
245
246         if (sqe->rw_flags || sqe->buf_index || sqe->splice_fd_in)
247                 return -EINVAL;
248         if (unlikely(req->flags & REQ_F_FIXED_FILE))
249                 return -EBADF;
250
251         lnk->old_dfd = READ_ONCE(sqe->fd);
252         lnk->new_dfd = READ_ONCE(sqe->len);
253         oldf = u64_to_user_ptr(READ_ONCE(sqe->addr));
254         newf = u64_to_user_ptr(READ_ONCE(sqe->addr2));
255         lnk->flags = READ_ONCE(sqe->hardlink_flags);
256
257         lnk->oldpath = getname(oldf);
258         if (IS_ERR(lnk->oldpath))
259                 return PTR_ERR(lnk->oldpath);
260
261         lnk->newpath = getname(newf);
262         if (IS_ERR(lnk->newpath)) {
263                 putname(lnk->oldpath);
264                 return PTR_ERR(lnk->newpath);
265         }
266
267         req->flags |= REQ_F_NEED_CLEANUP;
268         return 0;
269 }
270
271 int io_linkat(struct io_kiocb *req, unsigned int issue_flags)
272 {
273         struct io_link *lnk = io_kiocb_to_cmd(req, struct io_link);
274         int ret;
275
276         if (issue_flags & IO_URING_F_NONBLOCK)
277                 return -EAGAIN;
278
279         ret = do_linkat(lnk->old_dfd, lnk->oldpath, lnk->new_dfd,
280                                 lnk->newpath, lnk->flags);
281
282         req->flags &= ~REQ_F_NEED_CLEANUP;
283         io_req_set_res(req, ret, 0);
284         return IOU_OK;
285 }
286
287 void io_link_cleanup(struct io_kiocb *req)
288 {
289         struct io_link *sl = io_kiocb_to_cmd(req, struct io_link);
290
291         putname(sl->oldpath);
292         putname(sl->newpath);
293 }