Commit | Line | Data |
---|---|---|
d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
d1d04ef8 MS |
2 | /* |
3 | * Copyright (C) 2017 Red Hat, Inc. | |
d1d04ef8 MS |
4 | */ |
5 | ||
6 | #include <linux/cred.h> | |
7 | #include <linux/file.h> | |
dab5ca8f | 8 | #include <linux/mount.h> |
d1d04ef8 | 9 | #include <linux/xattr.h> |
16914e6f | 10 | #include <linux/uio.h> |
98487de3 | 11 | #include <linux/uaccess.h> |
d1d04ef8 MS |
12 | #include "overlayfs.h" |
13 | ||
8c444d2a VG |
14 | static char ovl_whatisit(struct inode *inode, struct inode *realinode) |
15 | { | |
16 | if (realinode != ovl_inode_upper(inode)) | |
17 | return 'l'; | |
18 | if (ovl_has_upperdata(inode)) | |
19 | return 'u'; | |
20 | else | |
21 | return 'm'; | |
22 | } | |
23 | ||
24 | static struct file *ovl_open_realfile(const struct file *file, | |
25 | struct inode *realinode) | |
d1d04ef8 MS |
26 | { |
27 | struct inode *inode = file_inode(file); | |
d1d04ef8 MS |
28 | struct file *realfile; |
29 | const struct cred *old_cred; | |
d9899030 | 30 | int flags = file->f_flags | O_NOATIME | FMODE_NONOTIFY; |
d1d04ef8 MS |
31 | |
32 | old_cred = ovl_override_creds(inode->i_sb); | |
d9899030 AG |
33 | realfile = open_with_fake_path(&file->f_path, flags, realinode, |
34 | current_cred()); | |
d1d04ef8 MS |
35 | revert_creds(old_cred); |
36 | ||
37 | pr_debug("open(%p[%pD2/%c], 0%o) -> (%p, 0%o)\n", | |
8c444d2a | 38 | file, file, ovl_whatisit(inode, realinode), file->f_flags, |
d1d04ef8 MS |
39 | realfile, IS_ERR(realfile) ? 0 : realfile->f_flags); |
40 | ||
41 | return realfile; | |
42 | } | |
43 | ||
2ef66b8a MS |
44 | #define OVL_SETFL_MASK (O_APPEND | O_NONBLOCK | O_NDELAY | O_DIRECT) |
45 | ||
46 | static int ovl_change_flags(struct file *file, unsigned int flags) | |
47 | { | |
48 | struct inode *inode = file_inode(file); | |
49 | int err; | |
50 | ||
51 | /* No atime modificaton on underlying */ | |
d9899030 | 52 | flags |= O_NOATIME | FMODE_NONOTIFY; |
2ef66b8a MS |
53 | |
54 | /* If some flag changed that cannot be changed then something's amiss */ | |
55 | if (WARN_ON((file->f_flags ^ flags) & ~OVL_SETFL_MASK)) | |
56 | return -EIO; | |
57 | ||
58 | flags &= OVL_SETFL_MASK; | |
59 | ||
60 | if (((flags ^ file->f_flags) & O_APPEND) && IS_APPEND(inode)) | |
61 | return -EPERM; | |
62 | ||
63 | if (flags & O_DIRECT) { | |
64 | if (!file->f_mapping->a_ops || | |
65 | !file->f_mapping->a_ops->direct_IO) | |
66 | return -EINVAL; | |
67 | } | |
68 | ||
69 | if (file->f_op->check_flags) { | |
70 | err = file->f_op->check_flags(flags); | |
71 | if (err) | |
72 | return err; | |
73 | } | |
74 | ||
75 | spin_lock(&file->f_lock); | |
76 | file->f_flags = (file->f_flags & ~OVL_SETFL_MASK) | flags; | |
77 | spin_unlock(&file->f_lock); | |
78 | ||
79 | return 0; | |
80 | } | |
81 | ||
8c444d2a VG |
82 | static int ovl_real_fdget_meta(const struct file *file, struct fd *real, |
83 | bool allow_meta) | |
2ef66b8a MS |
84 | { |
85 | struct inode *inode = file_inode(file); | |
8c444d2a | 86 | struct inode *realinode; |
2ef66b8a MS |
87 | |
88 | real->flags = 0; | |
89 | real->file = file->private_data; | |
90 | ||
8c444d2a VG |
91 | if (allow_meta) |
92 | realinode = ovl_inode_real(inode); | |
93 | else | |
94 | realinode = ovl_inode_realdata(inode); | |
95 | ||
2ef66b8a | 96 | /* Has it been copied up since we'd opened it? */ |
8c444d2a | 97 | if (unlikely(file_inode(real->file) != realinode)) { |
2ef66b8a | 98 | real->flags = FDPUT_FPUT; |
8c444d2a | 99 | real->file = ovl_open_realfile(file, realinode); |
2ef66b8a MS |
100 | |
101 | return PTR_ERR_OR_ZERO(real->file); | |
102 | } | |
103 | ||
104 | /* Did the flags change since open? */ | |
105 | if (unlikely((file->f_flags ^ real->file->f_flags) & ~O_NOATIME)) | |
106 | return ovl_change_flags(real->file, file->f_flags); | |
107 | ||
108 | return 0; | |
109 | } | |
110 | ||
8c444d2a VG |
111 | static int ovl_real_fdget(const struct file *file, struct fd *real) |
112 | { | |
113 | return ovl_real_fdget_meta(file, real, false); | |
114 | } | |
115 | ||
d1d04ef8 MS |
116 | static int ovl_open(struct inode *inode, struct file *file) |
117 | { | |
d1d04ef8 MS |
118 | struct file *realfile; |
119 | int err; | |
120 | ||
3428030d | 121 | err = ovl_maybe_copy_up(file_dentry(file), file->f_flags); |
d1d04ef8 MS |
122 | if (err) |
123 | return err; | |
124 | ||
125 | /* No longer need these flags, so don't pass them on to underlying fs */ | |
126 | file->f_flags &= ~(O_CREAT | O_EXCL | O_NOCTTY | O_TRUNC); | |
127 | ||
8c444d2a | 128 | realfile = ovl_open_realfile(file, ovl_inode_realdata(inode)); |
d1d04ef8 MS |
129 | if (IS_ERR(realfile)) |
130 | return PTR_ERR(realfile); | |
131 | ||
132 | file->private_data = realfile; | |
133 | ||
134 | return 0; | |
135 | } | |
136 | ||
137 | static int ovl_release(struct inode *inode, struct file *file) | |
138 | { | |
139 | fput(file->private_data); | |
140 | ||
141 | return 0; | |
142 | } | |
143 | ||
144 | static loff_t ovl_llseek(struct file *file, loff_t offset, int whence) | |
145 | { | |
9e46b840 AG |
146 | struct inode *inode = file_inode(file); |
147 | struct fd real; | |
148 | const struct cred *old_cred; | |
149 | ssize_t ret; | |
150 | ||
151 | /* | |
152 | * The two special cases below do not need to involve real fs, | |
153 | * so we can optimizing concurrent callers. | |
154 | */ | |
155 | if (offset == 0) { | |
156 | if (whence == SEEK_CUR) | |
157 | return file->f_pos; | |
158 | ||
159 | if (whence == SEEK_SET) | |
160 | return vfs_setpos(file, 0, 0); | |
161 | } | |
162 | ||
163 | ret = ovl_real_fdget(file, &real); | |
164 | if (ret) | |
165 | return ret; | |
166 | ||
167 | /* | |
168 | * Overlay file f_pos is the master copy that is preserved | |
169 | * through copy up and modified on read/write, but only real | |
170 | * fs knows how to SEEK_HOLE/SEEK_DATA and real fs may impose | |
171 | * limitations that are more strict than ->s_maxbytes for specific | |
172 | * files, so we use the real file to perform seeks. | |
173 | */ | |
174 | inode_lock(inode); | |
175 | real.file->f_pos = file->f_pos; | |
176 | ||
177 | old_cred = ovl_override_creds(inode->i_sb); | |
178 | ret = vfs_llseek(real.file, offset, whence); | |
179 | revert_creds(old_cred); | |
180 | ||
181 | file->f_pos = real.file->f_pos; | |
182 | inode_unlock(inode); | |
183 | ||
184 | fdput(real); | |
d1d04ef8 | 185 | |
9e46b840 | 186 | return ret; |
d1d04ef8 MS |
187 | } |
188 | ||
16914e6f MS |
189 | static void ovl_file_accessed(struct file *file) |
190 | { | |
191 | struct inode *inode, *upperinode; | |
192 | ||
193 | if (file->f_flags & O_NOATIME) | |
194 | return; | |
195 | ||
196 | inode = file_inode(file); | |
197 | upperinode = ovl_inode_upper(inode); | |
198 | ||
199 | if (!upperinode) | |
200 | return; | |
201 | ||
202 | if ((!timespec64_equal(&inode->i_mtime, &upperinode->i_mtime) || | |
203 | !timespec64_equal(&inode->i_ctime, &upperinode->i_ctime))) { | |
204 | inode->i_mtime = upperinode->i_mtime; | |
205 | inode->i_ctime = upperinode->i_ctime; | |
206 | } | |
207 | ||
208 | touch_atime(&file->f_path); | |
209 | } | |
210 | ||
211 | static rwf_t ovl_iocb_to_rwf(struct kiocb *iocb) | |
212 | { | |
213 | int ifl = iocb->ki_flags; | |
214 | rwf_t flags = 0; | |
215 | ||
216 | if (ifl & IOCB_NOWAIT) | |
217 | flags |= RWF_NOWAIT; | |
218 | if (ifl & IOCB_HIPRI) | |
219 | flags |= RWF_HIPRI; | |
220 | if (ifl & IOCB_DSYNC) | |
221 | flags |= RWF_DSYNC; | |
222 | if (ifl & IOCB_SYNC) | |
223 | flags |= RWF_SYNC; | |
224 | ||
225 | return flags; | |
226 | } | |
227 | ||
228 | static ssize_t ovl_read_iter(struct kiocb *iocb, struct iov_iter *iter) | |
229 | { | |
230 | struct file *file = iocb->ki_filp; | |
231 | struct fd real; | |
232 | const struct cred *old_cred; | |
233 | ssize_t ret; | |
234 | ||
235 | if (!iov_iter_count(iter)) | |
236 | return 0; | |
237 | ||
238 | ret = ovl_real_fdget(file, &real); | |
239 | if (ret) | |
240 | return ret; | |
241 | ||
242 | old_cred = ovl_override_creds(file_inode(file)->i_sb); | |
243 | ret = vfs_iter_read(real.file, iter, &iocb->ki_pos, | |
244 | ovl_iocb_to_rwf(iocb)); | |
245 | revert_creds(old_cred); | |
246 | ||
247 | ovl_file_accessed(file); | |
248 | ||
249 | fdput(real); | |
250 | ||
251 | return ret; | |
252 | } | |
253 | ||
2a92e07e MS |
254 | static ssize_t ovl_write_iter(struct kiocb *iocb, struct iov_iter *iter) |
255 | { | |
256 | struct file *file = iocb->ki_filp; | |
257 | struct inode *inode = file_inode(file); | |
258 | struct fd real; | |
259 | const struct cred *old_cred; | |
260 | ssize_t ret; | |
261 | ||
262 | if (!iov_iter_count(iter)) | |
263 | return 0; | |
264 | ||
265 | inode_lock(inode); | |
266 | /* Update mode */ | |
267 | ovl_copyattr(ovl_inode_real(inode), inode); | |
268 | ret = file_remove_privs(file); | |
269 | if (ret) | |
270 | goto out_unlock; | |
271 | ||
272 | ret = ovl_real_fdget(file, &real); | |
273 | if (ret) | |
274 | goto out_unlock; | |
275 | ||
276 | old_cred = ovl_override_creds(file_inode(file)->i_sb); | |
898cc19d | 277 | file_start_write(real.file); |
2a92e07e MS |
278 | ret = vfs_iter_write(real.file, iter, &iocb->ki_pos, |
279 | ovl_iocb_to_rwf(iocb)); | |
898cc19d | 280 | file_end_write(real.file); |
2a92e07e MS |
281 | revert_creds(old_cred); |
282 | ||
283 | /* Update size */ | |
284 | ovl_copyattr(ovl_inode_real(inode), inode); | |
285 | ||
286 | fdput(real); | |
287 | ||
288 | out_unlock: | |
289 | inode_unlock(inode); | |
290 | ||
291 | return ret; | |
292 | } | |
293 | ||
de30dfd6 MS |
294 | static int ovl_fsync(struct file *file, loff_t start, loff_t end, int datasync) |
295 | { | |
296 | struct fd real; | |
297 | const struct cred *old_cred; | |
298 | int ret; | |
299 | ||
8c444d2a | 300 | ret = ovl_real_fdget_meta(file, &real, !datasync); |
de30dfd6 MS |
301 | if (ret) |
302 | return ret; | |
303 | ||
304 | /* Don't sync lower file for fear of receiving EROFS error */ | |
305 | if (file_inode(real.file) == ovl_inode_upper(file_inode(file))) { | |
306 | old_cred = ovl_override_creds(file_inode(file)->i_sb); | |
307 | ret = vfs_fsync_range(real.file, start, end, datasync); | |
308 | revert_creds(old_cred); | |
309 | } | |
310 | ||
311 | fdput(real); | |
312 | ||
313 | return ret; | |
314 | } | |
315 | ||
2f502839 MS |
316 | static int ovl_mmap(struct file *file, struct vm_area_struct *vma) |
317 | { | |
318 | struct file *realfile = file->private_data; | |
319 | const struct cred *old_cred; | |
320 | int ret; | |
321 | ||
322 | if (!realfile->f_op->mmap) | |
323 | return -ENODEV; | |
324 | ||
325 | if (WARN_ON(file != vma->vm_file)) | |
326 | return -EIO; | |
327 | ||
328 | vma->vm_file = get_file(realfile); | |
329 | ||
330 | old_cred = ovl_override_creds(file_inode(file)->i_sb); | |
331 | ret = call_mmap(vma->vm_file, vma); | |
332 | revert_creds(old_cred); | |
333 | ||
334 | if (ret) { | |
335 | /* Drop reference count from new vm_file value */ | |
336 | fput(realfile); | |
337 | } else { | |
338 | /* Drop reference count from previous vm_file value */ | |
339 | fput(file); | |
340 | } | |
341 | ||
342 | ovl_file_accessed(file); | |
343 | ||
344 | return ret; | |
345 | } | |
346 | ||
aab8848c MS |
347 | static long ovl_fallocate(struct file *file, int mode, loff_t offset, loff_t len) |
348 | { | |
349 | struct inode *inode = file_inode(file); | |
350 | struct fd real; | |
351 | const struct cred *old_cred; | |
352 | int ret; | |
353 | ||
354 | ret = ovl_real_fdget(file, &real); | |
355 | if (ret) | |
356 | return ret; | |
357 | ||
358 | old_cred = ovl_override_creds(file_inode(file)->i_sb); | |
359 | ret = vfs_fallocate(real.file, mode, offset, len); | |
360 | revert_creds(old_cred); | |
361 | ||
362 | /* Update size */ | |
363 | ovl_copyattr(ovl_inode_real(inode), inode); | |
364 | ||
365 | fdput(real); | |
366 | ||
367 | return ret; | |
368 | } | |
369 | ||
b833a366 AG |
370 | static int ovl_fadvise(struct file *file, loff_t offset, loff_t len, int advice) |
371 | { | |
372 | struct fd real; | |
373 | const struct cred *old_cred; | |
374 | int ret; | |
375 | ||
376 | ret = ovl_real_fdget(file, &real); | |
377 | if (ret) | |
378 | return ret; | |
379 | ||
380 | old_cred = ovl_override_creds(file_inode(file)->i_sb); | |
381 | ret = vfs_fadvise(real.file, offset, len, advice); | |
382 | revert_creds(old_cred); | |
383 | ||
384 | fdput(real); | |
385 | ||
386 | return ret; | |
387 | } | |
388 | ||
dab5ca8f MS |
389 | static long ovl_real_ioctl(struct file *file, unsigned int cmd, |
390 | unsigned long arg) | |
391 | { | |
392 | struct fd real; | |
393 | const struct cred *old_cred; | |
394 | long ret; | |
395 | ||
396 | ret = ovl_real_fdget(file, &real); | |
397 | if (ret) | |
398 | return ret; | |
399 | ||
400 | old_cred = ovl_override_creds(file_inode(file)->i_sb); | |
401 | ret = vfs_ioctl(real.file, cmd, arg); | |
402 | revert_creds(old_cred); | |
403 | ||
404 | fdput(real); | |
405 | ||
406 | return ret; | |
407 | } | |
408 | ||
b21d9c43 | 409 | static long ovl_ioctl_set_flags(struct file *file, unsigned int cmd, |
941d935a | 410 | unsigned long arg, unsigned int iflags) |
dab5ca8f MS |
411 | { |
412 | long ret; | |
413 | struct inode *inode = file_inode(file); | |
941d935a | 414 | unsigned int old_iflags; |
98487de3 JX |
415 | |
416 | if (!inode_owner_or_capable(inode)) | |
417 | return -EACCES; | |
418 | ||
98487de3 JX |
419 | ret = mnt_want_write_file(file); |
420 | if (ret) | |
421 | return ret; | |
422 | ||
423 | inode_lock(inode); | |
424 | ||
425 | /* Check the capability before cred override */ | |
426 | ret = -EPERM; | |
941d935a AG |
427 | old_iflags = READ_ONCE(inode->i_flags); |
428 | if (((iflags ^ old_iflags) & (S_APPEND | S_IMMUTABLE)) && | |
98487de3 JX |
429 | !capable(CAP_LINUX_IMMUTABLE)) |
430 | goto unlock; | |
431 | ||
432 | ret = ovl_maybe_copy_up(file_dentry(file), O_WRONLY); | |
433 | if (ret) | |
434 | goto unlock; | |
435 | ||
b21d9c43 | 436 | ret = ovl_real_ioctl(file, cmd, arg); |
98487de3 JX |
437 | |
438 | ovl_copyflags(ovl_inode_real(inode), inode); | |
439 | unlock: | |
440 | inode_unlock(inode); | |
441 | ||
442 | mnt_drop_write_file(file); | |
443 | ||
444 | return ret; | |
445 | ||
446 | } | |
447 | ||
941d935a AG |
448 | static unsigned int ovl_fsflags_to_iflags(unsigned int flags) |
449 | { | |
450 | unsigned int iflags = 0; | |
451 | ||
452 | if (flags & FS_SYNC_FL) | |
453 | iflags |= S_SYNC; | |
454 | if (flags & FS_APPEND_FL) | |
455 | iflags |= S_APPEND; | |
456 | if (flags & FS_IMMUTABLE_FL) | |
457 | iflags |= S_IMMUTABLE; | |
458 | if (flags & FS_NOATIME_FL) | |
459 | iflags |= S_NOATIME; | |
460 | ||
461 | return iflags; | |
462 | } | |
463 | ||
464 | static long ovl_ioctl_set_fsflags(struct file *file, unsigned int cmd, | |
465 | unsigned long arg) | |
466 | { | |
467 | unsigned int flags; | |
468 | ||
469 | if (get_user(flags, (int __user *) arg)) | |
470 | return -EFAULT; | |
471 | ||
472 | return ovl_ioctl_set_flags(file, cmd, arg, | |
473 | ovl_fsflags_to_iflags(flags)); | |
474 | } | |
475 | ||
476 | static unsigned int ovl_fsxflags_to_iflags(unsigned int xflags) | |
477 | { | |
478 | unsigned int iflags = 0; | |
479 | ||
480 | if (xflags & FS_XFLAG_SYNC) | |
481 | iflags |= S_SYNC; | |
482 | if (xflags & FS_XFLAG_APPEND) | |
483 | iflags |= S_APPEND; | |
484 | if (xflags & FS_XFLAG_IMMUTABLE) | |
485 | iflags |= S_IMMUTABLE; | |
486 | if (xflags & FS_XFLAG_NOATIME) | |
487 | iflags |= S_NOATIME; | |
488 | ||
489 | return iflags; | |
490 | } | |
491 | ||
492 | static long ovl_ioctl_set_fsxflags(struct file *file, unsigned int cmd, | |
493 | unsigned long arg) | |
494 | { | |
495 | struct fsxattr fa; | |
496 | ||
497 | memset(&fa, 0, sizeof(fa)); | |
498 | if (copy_from_user(&fa, (void __user *) arg, sizeof(fa))) | |
499 | return -EFAULT; | |
500 | ||
501 | return ovl_ioctl_set_flags(file, cmd, arg, | |
502 | ovl_fsxflags_to_iflags(fa.fsx_xflags)); | |
503 | } | |
504 | ||
98487de3 JX |
505 | static long ovl_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
506 | { | |
507 | long ret; | |
dab5ca8f MS |
508 | |
509 | switch (cmd) { | |
510 | case FS_IOC_GETFLAGS: | |
b21d9c43 | 511 | case FS_IOC_FSGETXATTR: |
dab5ca8f MS |
512 | ret = ovl_real_ioctl(file, cmd, arg); |
513 | break; | |
514 | ||
515 | case FS_IOC_SETFLAGS: | |
941d935a AG |
516 | ret = ovl_ioctl_set_fsflags(file, cmd, arg); |
517 | break; | |
518 | ||
b21d9c43 | 519 | case FS_IOC_FSSETXATTR: |
941d935a | 520 | ret = ovl_ioctl_set_fsxflags(file, cmd, arg); |
dab5ca8f MS |
521 | break; |
522 | ||
523 | default: | |
524 | ret = -ENOTTY; | |
525 | } | |
526 | ||
527 | return ret; | |
528 | } | |
529 | ||
530 | static long ovl_compat_ioctl(struct file *file, unsigned int cmd, | |
531 | unsigned long arg) | |
532 | { | |
533 | switch (cmd) { | |
534 | case FS_IOC32_GETFLAGS: | |
535 | cmd = FS_IOC_GETFLAGS; | |
536 | break; | |
537 | ||
538 | case FS_IOC32_SETFLAGS: | |
539 | cmd = FS_IOC_SETFLAGS; | |
540 | break; | |
541 | ||
542 | default: | |
543 | return -ENOIOCTLCMD; | |
544 | } | |
545 | ||
546 | return ovl_ioctl(file, cmd, arg); | |
547 | } | |
548 | ||
8ede2055 MS |
549 | enum ovl_copyop { |
550 | OVL_COPY, | |
551 | OVL_CLONE, | |
552 | OVL_DEDUPE, | |
553 | }; | |
554 | ||
42ec3d4c | 555 | static loff_t ovl_copyfile(struct file *file_in, loff_t pos_in, |
8ede2055 | 556 | struct file *file_out, loff_t pos_out, |
42ec3d4c | 557 | loff_t len, unsigned int flags, enum ovl_copyop op) |
8ede2055 MS |
558 | { |
559 | struct inode *inode_out = file_inode(file_out); | |
560 | struct fd real_in, real_out; | |
561 | const struct cred *old_cred; | |
42ec3d4c | 562 | loff_t ret; |
8ede2055 MS |
563 | |
564 | ret = ovl_real_fdget(file_out, &real_out); | |
565 | if (ret) | |
566 | return ret; | |
567 | ||
568 | ret = ovl_real_fdget(file_in, &real_in); | |
569 | if (ret) { | |
570 | fdput(real_out); | |
571 | return ret; | |
572 | } | |
573 | ||
574 | old_cred = ovl_override_creds(file_inode(file_out)->i_sb); | |
575 | switch (op) { | |
576 | case OVL_COPY: | |
577 | ret = vfs_copy_file_range(real_in.file, pos_in, | |
578 | real_out.file, pos_out, len, flags); | |
579 | break; | |
580 | ||
581 | case OVL_CLONE: | |
a725356b | 582 | ret = vfs_clone_file_range(real_in.file, pos_in, |
452ce659 | 583 | real_out.file, pos_out, len, flags); |
8ede2055 MS |
584 | break; |
585 | ||
586 | case OVL_DEDUPE: | |
587 | ret = vfs_dedupe_file_range_one(real_in.file, pos_in, | |
df365836 DW |
588 | real_out.file, pos_out, len, |
589 | flags); | |
8ede2055 MS |
590 | break; |
591 | } | |
592 | revert_creds(old_cred); | |
593 | ||
594 | /* Update size */ | |
595 | ovl_copyattr(ovl_inode_real(inode_out), inode_out); | |
596 | ||
597 | fdput(real_in); | |
598 | fdput(real_out); | |
599 | ||
600 | return ret; | |
601 | } | |
602 | ||
603 | static ssize_t ovl_copy_file_range(struct file *file_in, loff_t pos_in, | |
604 | struct file *file_out, loff_t pos_out, | |
605 | size_t len, unsigned int flags) | |
606 | { | |
607 | return ovl_copyfile(file_in, pos_in, file_out, pos_out, len, flags, | |
608 | OVL_COPY); | |
609 | } | |
610 | ||
42ec3d4c DW |
611 | static loff_t ovl_remap_file_range(struct file *file_in, loff_t pos_in, |
612 | struct file *file_out, loff_t pos_out, | |
613 | loff_t len, unsigned int remap_flags) | |
8ede2055 | 614 | { |
2e5dfc99 DW |
615 | enum ovl_copyop op; |
616 | ||
617 | if (remap_flags & ~(REMAP_FILE_DEDUP | REMAP_FILE_ADVISORY)) | |
618 | return -EINVAL; | |
619 | ||
620 | if (remap_flags & REMAP_FILE_DEDUP) | |
621 | op = OVL_DEDUPE; | |
622 | else | |
623 | op = OVL_CLONE; | |
8ede2055 | 624 | |
8ede2055 MS |
625 | /* |
626 | * Don't copy up because of a dedupe request, this wouldn't make sense | |
627 | * most of the time (data would be duplicated instead of deduplicated). | |
628 | */ | |
2e5dfc99 DW |
629 | if (op == OVL_DEDUPE && |
630 | (!ovl_inode_upper(file_inode(file_in)) || | |
631 | !ovl_inode_upper(file_inode(file_out)))) | |
8ede2055 MS |
632 | return -EPERM; |
633 | ||
452ce659 DW |
634 | return ovl_copyfile(file_in, pos_in, file_out, pos_out, len, |
635 | remap_flags, op); | |
8ede2055 MS |
636 | } |
637 | ||
d1d04ef8 MS |
638 | const struct file_operations ovl_file_operations = { |
639 | .open = ovl_open, | |
640 | .release = ovl_release, | |
641 | .llseek = ovl_llseek, | |
16914e6f | 642 | .read_iter = ovl_read_iter, |
2a92e07e | 643 | .write_iter = ovl_write_iter, |
de30dfd6 | 644 | .fsync = ovl_fsync, |
2f502839 | 645 | .mmap = ovl_mmap, |
aab8848c | 646 | .fallocate = ovl_fallocate, |
b833a366 | 647 | .fadvise = ovl_fadvise, |
dab5ca8f MS |
648 | .unlocked_ioctl = ovl_ioctl, |
649 | .compat_ioctl = ovl_compat_ioctl, | |
8ede2055 MS |
650 | |
651 | .copy_file_range = ovl_copy_file_range, | |
2e5dfc99 | 652 | .remap_file_range = ovl_remap_file_range, |
d1d04ef8 | 653 | }; |