]>
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> |
1a980b8c | 12 | #include <linux/splice.h> |
292f902a | 13 | #include <linux/security.h> |
1a980b8c MZ |
14 | #include <linux/mm.h> |
15 | #include <linux/fs.h> | |
d1d04ef8 MS |
16 | #include "overlayfs.h" |
17 | ||
2406a307 JX |
18 | struct ovl_aio_req { |
19 | struct kiocb iocb; | |
20 | struct kiocb *orig_iocb; | |
21 | struct fd fd; | |
22 | }; | |
23 | ||
24 | static struct kmem_cache *ovl_aio_request_cachep; | |
25 | ||
8c444d2a VG |
26 | static char ovl_whatisit(struct inode *inode, struct inode *realinode) |
27 | { | |
28 | if (realinode != ovl_inode_upper(inode)) | |
29 | return 'l'; | |
30 | if (ovl_has_upperdata(inode)) | |
31 | return 'u'; | |
32 | else | |
33 | return 'm'; | |
34 | } | |
35 | ||
81a33c1e AG |
36 | /* No atime modificaton nor notify on underlying */ |
37 | #define OVL_OPEN_FLAGS (O_NOATIME | FMODE_NONOTIFY) | |
38 | ||
8c444d2a VG |
39 | static struct file *ovl_open_realfile(const struct file *file, |
40 | struct inode *realinode) | |
d1d04ef8 MS |
41 | { |
42 | struct inode *inode = file_inode(file); | |
d1d04ef8 MS |
43 | struct file *realfile; |
44 | const struct cred *old_cred; | |
81a33c1e | 45 | int flags = file->f_flags | OVL_OPEN_FLAGS; |
05acefb4 MS |
46 | int acc_mode = ACC_MODE(flags); |
47 | int err; | |
48 | ||
49 | if (flags & O_APPEND) | |
50 | acc_mode |= MAY_APPEND; | |
d1d04ef8 MS |
51 | |
52 | old_cred = ovl_override_creds(inode->i_sb); | |
47291baa | 53 | err = inode_permission(&init_user_ns, realinode, MAY_OPEN | acc_mode); |
05acefb4 MS |
54 | if (err) { |
55 | realfile = ERR_PTR(err); | |
05acefb4 | 56 | } else { |
21cb47be | 57 | if (!inode_owner_or_capable(&init_user_ns, realinode)) |
b6650dab MS |
58 | flags &= ~O_NOATIME; |
59 | ||
05acefb4 MS |
60 | realfile = open_with_fake_path(&file->f_path, flags, realinode, |
61 | current_cred()); | |
62 | } | |
d1d04ef8 MS |
63 | revert_creds(old_cred); |
64 | ||
65 | pr_debug("open(%p[%pD2/%c], 0%o) -> (%p, 0%o)\n", | |
8c444d2a | 66 | file, file, ovl_whatisit(inode, realinode), file->f_flags, |
d1d04ef8 MS |
67 | realfile, IS_ERR(realfile) ? 0 : realfile->f_flags); |
68 | ||
69 | return realfile; | |
70 | } | |
71 | ||
2ef66b8a MS |
72 | #define OVL_SETFL_MASK (O_APPEND | O_NONBLOCK | O_NDELAY | O_DIRECT) |
73 | ||
74 | static int ovl_change_flags(struct file *file, unsigned int flags) | |
75 | { | |
76 | struct inode *inode = file_inode(file); | |
77 | int err; | |
78 | ||
2ef66b8a MS |
79 | flags &= OVL_SETFL_MASK; |
80 | ||
81 | if (((flags ^ file->f_flags) & O_APPEND) && IS_APPEND(inode)) | |
82 | return -EPERM; | |
83 | ||
84 | if (flags & O_DIRECT) { | |
85 | if (!file->f_mapping->a_ops || | |
86 | !file->f_mapping->a_ops->direct_IO) | |
87 | return -EINVAL; | |
88 | } | |
89 | ||
90 | if (file->f_op->check_flags) { | |
91 | err = file->f_op->check_flags(flags); | |
92 | if (err) | |
93 | return err; | |
94 | } | |
95 | ||
96 | spin_lock(&file->f_lock); | |
97 | file->f_flags = (file->f_flags & ~OVL_SETFL_MASK) | flags; | |
98 | spin_unlock(&file->f_lock); | |
99 | ||
100 | return 0; | |
101 | } | |
102 | ||
8c444d2a VG |
103 | static int ovl_real_fdget_meta(const struct file *file, struct fd *real, |
104 | bool allow_meta) | |
2ef66b8a MS |
105 | { |
106 | struct inode *inode = file_inode(file); | |
8c444d2a | 107 | struct inode *realinode; |
2ef66b8a MS |
108 | |
109 | real->flags = 0; | |
110 | real->file = file->private_data; | |
111 | ||
8c444d2a VG |
112 | if (allow_meta) |
113 | realinode = ovl_inode_real(inode); | |
114 | else | |
115 | realinode = ovl_inode_realdata(inode); | |
116 | ||
2ef66b8a | 117 | /* Has it been copied up since we'd opened it? */ |
8c444d2a | 118 | if (unlikely(file_inode(real->file) != realinode)) { |
2ef66b8a | 119 | real->flags = FDPUT_FPUT; |
8c444d2a | 120 | real->file = ovl_open_realfile(file, realinode); |
2ef66b8a MS |
121 | |
122 | return PTR_ERR_OR_ZERO(real->file); | |
123 | } | |
124 | ||
125 | /* Did the flags change since open? */ | |
81a33c1e | 126 | if (unlikely((file->f_flags ^ real->file->f_flags) & ~OVL_OPEN_FLAGS)) |
2ef66b8a MS |
127 | return ovl_change_flags(real->file, file->f_flags); |
128 | ||
129 | return 0; | |
130 | } | |
131 | ||
8c444d2a VG |
132 | static int ovl_real_fdget(const struct file *file, struct fd *real) |
133 | { | |
61536bed AG |
134 | if (d_is_dir(file_dentry(file))) { |
135 | real->flags = 0; | |
136 | real->file = ovl_dir_real_file(file, false); | |
137 | ||
138 | return PTR_ERR_OR_ZERO(real->file); | |
139 | } | |
140 | ||
8c444d2a VG |
141 | return ovl_real_fdget_meta(file, real, false); |
142 | } | |
143 | ||
d1d04ef8 MS |
144 | static int ovl_open(struct inode *inode, struct file *file) |
145 | { | |
d1d04ef8 MS |
146 | struct file *realfile; |
147 | int err; | |
148 | ||
3428030d | 149 | err = ovl_maybe_copy_up(file_dentry(file), file->f_flags); |
d1d04ef8 MS |
150 | if (err) |
151 | return err; | |
152 | ||
153 | /* No longer need these flags, so don't pass them on to underlying fs */ | |
154 | file->f_flags &= ~(O_CREAT | O_EXCL | O_NOCTTY | O_TRUNC); | |
155 | ||
8c444d2a | 156 | realfile = ovl_open_realfile(file, ovl_inode_realdata(inode)); |
d1d04ef8 MS |
157 | if (IS_ERR(realfile)) |
158 | return PTR_ERR(realfile); | |
159 | ||
160 | file->private_data = realfile; | |
161 | ||
162 | return 0; | |
163 | } | |
164 | ||
165 | static int ovl_release(struct inode *inode, struct file *file) | |
166 | { | |
167 | fput(file->private_data); | |
168 | ||
169 | return 0; | |
170 | } | |
171 | ||
172 | static loff_t ovl_llseek(struct file *file, loff_t offset, int whence) | |
173 | { | |
9e46b840 AG |
174 | struct inode *inode = file_inode(file); |
175 | struct fd real; | |
176 | const struct cred *old_cred; | |
a4ac9d45 | 177 | loff_t ret; |
9e46b840 AG |
178 | |
179 | /* | |
180 | * The two special cases below do not need to involve real fs, | |
181 | * so we can optimizing concurrent callers. | |
182 | */ | |
183 | if (offset == 0) { | |
184 | if (whence == SEEK_CUR) | |
185 | return file->f_pos; | |
186 | ||
187 | if (whence == SEEK_SET) | |
188 | return vfs_setpos(file, 0, 0); | |
189 | } | |
190 | ||
191 | ret = ovl_real_fdget(file, &real); | |
192 | if (ret) | |
193 | return ret; | |
194 | ||
195 | /* | |
196 | * Overlay file f_pos is the master copy that is preserved | |
197 | * through copy up and modified on read/write, but only real | |
198 | * fs knows how to SEEK_HOLE/SEEK_DATA and real fs may impose | |
199 | * limitations that are more strict than ->s_maxbytes for specific | |
200 | * files, so we use the real file to perform seeks. | |
201 | */ | |
b1f9d385 | 202 | ovl_inode_lock(inode); |
9e46b840 AG |
203 | real.file->f_pos = file->f_pos; |
204 | ||
205 | old_cred = ovl_override_creds(inode->i_sb); | |
206 | ret = vfs_llseek(real.file, offset, whence); | |
207 | revert_creds(old_cred); | |
208 | ||
209 | file->f_pos = real.file->f_pos; | |
b1f9d385 | 210 | ovl_inode_unlock(inode); |
9e46b840 AG |
211 | |
212 | fdput(real); | |
d1d04ef8 | 213 | |
9e46b840 | 214 | return ret; |
d1d04ef8 MS |
215 | } |
216 | ||
16914e6f MS |
217 | static void ovl_file_accessed(struct file *file) |
218 | { | |
219 | struct inode *inode, *upperinode; | |
220 | ||
221 | if (file->f_flags & O_NOATIME) | |
222 | return; | |
223 | ||
224 | inode = file_inode(file); | |
225 | upperinode = ovl_inode_upper(inode); | |
226 | ||
227 | if (!upperinode) | |
228 | return; | |
229 | ||
230 | if ((!timespec64_equal(&inode->i_mtime, &upperinode->i_mtime) || | |
231 | !timespec64_equal(&inode->i_ctime, &upperinode->i_ctime))) { | |
232 | inode->i_mtime = upperinode->i_mtime; | |
233 | inode->i_ctime = upperinode->i_ctime; | |
234 | } | |
235 | ||
236 | touch_atime(&file->f_path); | |
237 | } | |
238 | ||
b778e1ee | 239 | static rwf_t ovl_iocb_to_rwf(int ifl) |
16914e6f | 240 | { |
16914e6f MS |
241 | rwf_t flags = 0; |
242 | ||
243 | if (ifl & IOCB_NOWAIT) | |
244 | flags |= RWF_NOWAIT; | |
245 | if (ifl & IOCB_HIPRI) | |
246 | flags |= RWF_HIPRI; | |
247 | if (ifl & IOCB_DSYNC) | |
248 | flags |= RWF_DSYNC; | |
249 | if (ifl & IOCB_SYNC) | |
250 | flags |= RWF_SYNC; | |
251 | ||
252 | return flags; | |
253 | } | |
254 | ||
2406a307 JX |
255 | static void ovl_aio_cleanup_handler(struct ovl_aio_req *aio_req) |
256 | { | |
257 | struct kiocb *iocb = &aio_req->iocb; | |
258 | struct kiocb *orig_iocb = aio_req->orig_iocb; | |
259 | ||
260 | if (iocb->ki_flags & IOCB_WRITE) { | |
261 | struct inode *inode = file_inode(orig_iocb->ki_filp); | |
262 | ||
c8536804 MS |
263 | /* Actually acquired in ovl_write_iter() */ |
264 | __sb_writers_acquired(file_inode(iocb->ki_filp)->i_sb, | |
265 | SB_FREEZE_WRITE); | |
2406a307 JX |
266 | file_end_write(iocb->ki_filp); |
267 | ovl_copyattr(ovl_inode_real(inode), inode); | |
268 | } | |
269 | ||
270 | orig_iocb->ki_pos = iocb->ki_pos; | |
271 | fdput(aio_req->fd); | |
272 | kmem_cache_free(ovl_aio_request_cachep, aio_req); | |
273 | } | |
274 | ||
275 | static void ovl_aio_rw_complete(struct kiocb *iocb, long res, long res2) | |
276 | { | |
277 | struct ovl_aio_req *aio_req = container_of(iocb, | |
278 | struct ovl_aio_req, iocb); | |
279 | struct kiocb *orig_iocb = aio_req->orig_iocb; | |
280 | ||
281 | ovl_aio_cleanup_handler(aio_req); | |
282 | orig_iocb->ki_complete(orig_iocb, res, res2); | |
283 | } | |
284 | ||
16914e6f MS |
285 | static ssize_t ovl_read_iter(struct kiocb *iocb, struct iov_iter *iter) |
286 | { | |
287 | struct file *file = iocb->ki_filp; | |
288 | struct fd real; | |
289 | const struct cred *old_cred; | |
290 | ssize_t ret; | |
291 | ||
292 | if (!iov_iter_count(iter)) | |
293 | return 0; | |
294 | ||
295 | ret = ovl_real_fdget(file, &real); | |
296 | if (ret) | |
297 | return ret; | |
298 | ||
1dc1eed4 MS |
299 | ret = -EINVAL; |
300 | if (iocb->ki_flags & IOCB_DIRECT && | |
301 | (!real.file->f_mapping->a_ops || | |
302 | !real.file->f_mapping->a_ops->direct_IO)) | |
303 | goto out_fdput; | |
304 | ||
16914e6f | 305 | old_cred = ovl_override_creds(file_inode(file)->i_sb); |
2406a307 JX |
306 | if (is_sync_kiocb(iocb)) { |
307 | ret = vfs_iter_read(real.file, iter, &iocb->ki_pos, | |
b778e1ee | 308 | ovl_iocb_to_rwf(iocb->ki_flags)); |
2406a307 JX |
309 | } else { |
310 | struct ovl_aio_req *aio_req; | |
311 | ||
312 | ret = -ENOMEM; | |
313 | aio_req = kmem_cache_zalloc(ovl_aio_request_cachep, GFP_KERNEL); | |
314 | if (!aio_req) | |
315 | goto out; | |
316 | ||
317 | aio_req->fd = real; | |
318 | real.flags = 0; | |
319 | aio_req->orig_iocb = iocb; | |
320 | kiocb_clone(&aio_req->iocb, iocb, real.file); | |
321 | aio_req->iocb.ki_complete = ovl_aio_rw_complete; | |
322 | ret = vfs_iocb_iter_read(real.file, &aio_req->iocb, iter); | |
323 | if (ret != -EIOCBQUEUED) | |
324 | ovl_aio_cleanup_handler(aio_req); | |
325 | } | |
326 | out: | |
16914e6f | 327 | revert_creds(old_cred); |
16914e6f | 328 | ovl_file_accessed(file); |
1dc1eed4 | 329 | out_fdput: |
16914e6f MS |
330 | fdput(real); |
331 | ||
332 | return ret; | |
333 | } | |
334 | ||
2a92e07e MS |
335 | static ssize_t ovl_write_iter(struct kiocb *iocb, struct iov_iter *iter) |
336 | { | |
337 | struct file *file = iocb->ki_filp; | |
338 | struct inode *inode = file_inode(file); | |
339 | struct fd real; | |
340 | const struct cred *old_cred; | |
341 | ssize_t ret; | |
c86243b0 | 342 | int ifl = iocb->ki_flags; |
2a92e07e MS |
343 | |
344 | if (!iov_iter_count(iter)) | |
345 | return 0; | |
346 | ||
347 | inode_lock(inode); | |
348 | /* Update mode */ | |
349 | ovl_copyattr(ovl_inode_real(inode), inode); | |
350 | ret = file_remove_privs(file); | |
351 | if (ret) | |
352 | goto out_unlock; | |
353 | ||
354 | ret = ovl_real_fdget(file, &real); | |
355 | if (ret) | |
356 | goto out_unlock; | |
357 | ||
1dc1eed4 MS |
358 | ret = -EINVAL; |
359 | if (iocb->ki_flags & IOCB_DIRECT && | |
360 | (!real.file->f_mapping->a_ops || | |
361 | !real.file->f_mapping->a_ops->direct_IO)) | |
362 | goto out_fdput; | |
363 | ||
c86243b0 VG |
364 | if (!ovl_should_sync(OVL_FS(inode->i_sb))) |
365 | ifl &= ~(IOCB_DSYNC | IOCB_SYNC); | |
366 | ||
2a92e07e | 367 | old_cred = ovl_override_creds(file_inode(file)->i_sb); |
2406a307 JX |
368 | if (is_sync_kiocb(iocb)) { |
369 | file_start_write(real.file); | |
370 | ret = vfs_iter_write(real.file, iter, &iocb->ki_pos, | |
c86243b0 | 371 | ovl_iocb_to_rwf(ifl)); |
2406a307 JX |
372 | file_end_write(real.file); |
373 | /* Update size */ | |
374 | ovl_copyattr(ovl_inode_real(inode), inode); | |
375 | } else { | |
376 | struct ovl_aio_req *aio_req; | |
377 | ||
378 | ret = -ENOMEM; | |
379 | aio_req = kmem_cache_zalloc(ovl_aio_request_cachep, GFP_KERNEL); | |
380 | if (!aio_req) | |
381 | goto out; | |
382 | ||
383 | file_start_write(real.file); | |
c8536804 MS |
384 | /* Pacify lockdep, same trick as done in aio_write() */ |
385 | __sb_writers_release(file_inode(real.file)->i_sb, | |
386 | SB_FREEZE_WRITE); | |
2406a307 JX |
387 | aio_req->fd = real; |
388 | real.flags = 0; | |
389 | aio_req->orig_iocb = iocb; | |
390 | kiocb_clone(&aio_req->iocb, iocb, real.file); | |
c86243b0 | 391 | aio_req->iocb.ki_flags = ifl; |
2406a307 JX |
392 | aio_req->iocb.ki_complete = ovl_aio_rw_complete; |
393 | ret = vfs_iocb_iter_write(real.file, &aio_req->iocb, iter); | |
394 | if (ret != -EIOCBQUEUED) | |
395 | ovl_aio_cleanup_handler(aio_req); | |
396 | } | |
397 | out: | |
2a92e07e | 398 | revert_creds(old_cred); |
1dc1eed4 | 399 | out_fdput: |
2a92e07e MS |
400 | fdput(real); |
401 | ||
402 | out_unlock: | |
403 | inode_unlock(inode); | |
404 | ||
405 | return ret; | |
406 | } | |
407 | ||
9b91b6b0 MS |
408 | /* |
409 | * Calling iter_file_splice_write() directly from overlay's f_op may deadlock | |
410 | * due to lock order inversion between pipe->mutex in iter_file_splice_write() | |
411 | * and file_start_write(real.file) in ovl_write_iter(). | |
412 | * | |
413 | * So do everything ovl_write_iter() does and call iter_file_splice_write() on | |
414 | * the real file. | |
415 | */ | |
416 | static ssize_t ovl_splice_write(struct pipe_inode_info *pipe, struct file *out, | |
417 | loff_t *ppos, size_t len, unsigned int flags) | |
418 | { | |
419 | struct fd real; | |
420 | const struct cred *old_cred; | |
421 | struct inode *inode = file_inode(out); | |
422 | struct inode *realinode = ovl_inode_real(inode); | |
423 | ssize_t ret; | |
424 | ||
425 | inode_lock(inode); | |
426 | /* Update mode */ | |
427 | ovl_copyattr(realinode, inode); | |
428 | ret = file_remove_privs(out); | |
429 | if (ret) | |
430 | goto out_unlock; | |
431 | ||
432 | ret = ovl_real_fdget(out, &real); | |
433 | if (ret) | |
434 | goto out_unlock; | |
435 | ||
436 | old_cred = ovl_override_creds(inode->i_sb); | |
437 | file_start_write(real.file); | |
438 | ||
439 | ret = iter_file_splice_write(pipe, real.file, ppos, len, flags); | |
440 | ||
441 | file_end_write(real.file); | |
442 | /* Update size */ | |
443 | ovl_copyattr(realinode, inode); | |
444 | revert_creds(old_cred); | |
445 | fdput(real); | |
446 | ||
447 | out_unlock: | |
448 | inode_unlock(inode); | |
449 | ||
450 | return ret; | |
451 | } | |
452 | ||
de30dfd6 MS |
453 | static int ovl_fsync(struct file *file, loff_t start, loff_t end, int datasync) |
454 | { | |
455 | struct fd real; | |
456 | const struct cred *old_cred; | |
457 | int ret; | |
458 | ||
335d3fc5 SD |
459 | ret = ovl_sync_status(OVL_FS(file_inode(file)->i_sb)); |
460 | if (ret <= 0) | |
461 | return ret; | |
c86243b0 | 462 | |
8c444d2a | 463 | ret = ovl_real_fdget_meta(file, &real, !datasync); |
de30dfd6 MS |
464 | if (ret) |
465 | return ret; | |
466 | ||
467 | /* Don't sync lower file for fear of receiving EROFS error */ | |
468 | if (file_inode(real.file) == ovl_inode_upper(file_inode(file))) { | |
469 | old_cred = ovl_override_creds(file_inode(file)->i_sb); | |
470 | ret = vfs_fsync_range(real.file, start, end, datasync); | |
471 | revert_creds(old_cred); | |
472 | } | |
473 | ||
474 | fdput(real); | |
475 | ||
476 | return ret; | |
477 | } | |
478 | ||
2f502839 MS |
479 | static int ovl_mmap(struct file *file, struct vm_area_struct *vma) |
480 | { | |
481 | struct file *realfile = file->private_data; | |
482 | const struct cred *old_cred; | |
483 | int ret; | |
484 | ||
485 | if (!realfile->f_op->mmap) | |
486 | return -ENODEV; | |
487 | ||
488 | if (WARN_ON(file != vma->vm_file)) | |
489 | return -EIO; | |
490 | ||
2896900e | 491 | vma_set_file(vma, realfile); |
2f502839 MS |
492 | |
493 | old_cred = ovl_override_creds(file_inode(file)->i_sb); | |
494 | ret = call_mmap(vma->vm_file, vma); | |
495 | revert_creds(old_cred); | |
2f502839 MS |
496 | ovl_file_accessed(file); |
497 | ||
498 | return ret; | |
499 | } | |
500 | ||
aab8848c MS |
501 | static long ovl_fallocate(struct file *file, int mode, loff_t offset, loff_t len) |
502 | { | |
503 | struct inode *inode = file_inode(file); | |
504 | struct fd real; | |
505 | const struct cred *old_cred; | |
506 | int ret; | |
507 | ||
508 | ret = ovl_real_fdget(file, &real); | |
509 | if (ret) | |
510 | return ret; | |
511 | ||
512 | old_cred = ovl_override_creds(file_inode(file)->i_sb); | |
513 | ret = vfs_fallocate(real.file, mode, offset, len); | |
514 | revert_creds(old_cred); | |
515 | ||
516 | /* Update size */ | |
517 | ovl_copyattr(ovl_inode_real(inode), inode); | |
518 | ||
519 | fdput(real); | |
520 | ||
521 | return ret; | |
522 | } | |
523 | ||
b833a366 AG |
524 | static int ovl_fadvise(struct file *file, loff_t offset, loff_t len, int advice) |
525 | { | |
526 | struct fd real; | |
527 | const struct cred *old_cred; | |
528 | int ret; | |
529 | ||
530 | ret = ovl_real_fdget(file, &real); | |
531 | if (ret) | |
532 | return ret; | |
533 | ||
534 | old_cred = ovl_override_creds(file_inode(file)->i_sb); | |
535 | ret = vfs_fadvise(real.file, offset, len, advice); | |
536 | revert_creds(old_cred); | |
537 | ||
538 | fdput(real); | |
539 | ||
540 | return ret; | |
541 | } | |
542 | ||
8ede2055 MS |
543 | enum ovl_copyop { |
544 | OVL_COPY, | |
545 | OVL_CLONE, | |
546 | OVL_DEDUPE, | |
547 | }; | |
548 | ||
42ec3d4c | 549 | static loff_t ovl_copyfile(struct file *file_in, loff_t pos_in, |
8ede2055 | 550 | struct file *file_out, loff_t pos_out, |
42ec3d4c | 551 | loff_t len, unsigned int flags, enum ovl_copyop op) |
8ede2055 MS |
552 | { |
553 | struct inode *inode_out = file_inode(file_out); | |
554 | struct fd real_in, real_out; | |
555 | const struct cred *old_cred; | |
42ec3d4c | 556 | loff_t ret; |
8ede2055 MS |
557 | |
558 | ret = ovl_real_fdget(file_out, &real_out); | |
559 | if (ret) | |
560 | return ret; | |
561 | ||
562 | ret = ovl_real_fdget(file_in, &real_in); | |
563 | if (ret) { | |
564 | fdput(real_out); | |
565 | return ret; | |
566 | } | |
567 | ||
568 | old_cred = ovl_override_creds(file_inode(file_out)->i_sb); | |
569 | switch (op) { | |
570 | case OVL_COPY: | |
571 | ret = vfs_copy_file_range(real_in.file, pos_in, | |
572 | real_out.file, pos_out, len, flags); | |
573 | break; | |
574 | ||
575 | case OVL_CLONE: | |
a725356b | 576 | ret = vfs_clone_file_range(real_in.file, pos_in, |
452ce659 | 577 | real_out.file, pos_out, len, flags); |
8ede2055 MS |
578 | break; |
579 | ||
580 | case OVL_DEDUPE: | |
581 | ret = vfs_dedupe_file_range_one(real_in.file, pos_in, | |
df365836 DW |
582 | real_out.file, pos_out, len, |
583 | flags); | |
8ede2055 MS |
584 | break; |
585 | } | |
586 | revert_creds(old_cred); | |
587 | ||
588 | /* Update size */ | |
589 | ovl_copyattr(ovl_inode_real(inode_out), inode_out); | |
590 | ||
591 | fdput(real_in); | |
592 | fdput(real_out); | |
593 | ||
594 | return ret; | |
595 | } | |
596 | ||
597 | static ssize_t ovl_copy_file_range(struct file *file_in, loff_t pos_in, | |
598 | struct file *file_out, loff_t pos_out, | |
599 | size_t len, unsigned int flags) | |
600 | { | |
601 | return ovl_copyfile(file_in, pos_in, file_out, pos_out, len, flags, | |
602 | OVL_COPY); | |
603 | } | |
604 | ||
42ec3d4c DW |
605 | static loff_t ovl_remap_file_range(struct file *file_in, loff_t pos_in, |
606 | struct file *file_out, loff_t pos_out, | |
607 | loff_t len, unsigned int remap_flags) | |
8ede2055 | 608 | { |
2e5dfc99 DW |
609 | enum ovl_copyop op; |
610 | ||
611 | if (remap_flags & ~(REMAP_FILE_DEDUP | REMAP_FILE_ADVISORY)) | |
612 | return -EINVAL; | |
613 | ||
614 | if (remap_flags & REMAP_FILE_DEDUP) | |
615 | op = OVL_DEDUPE; | |
616 | else | |
617 | op = OVL_CLONE; | |
8ede2055 | 618 | |
8ede2055 MS |
619 | /* |
620 | * Don't copy up because of a dedupe request, this wouldn't make sense | |
621 | * most of the time (data would be duplicated instead of deduplicated). | |
622 | */ | |
2e5dfc99 DW |
623 | if (op == OVL_DEDUPE && |
624 | (!ovl_inode_upper(file_inode(file_in)) || | |
625 | !ovl_inode_upper(file_inode(file_out)))) | |
8ede2055 MS |
626 | return -EPERM; |
627 | ||
452ce659 DW |
628 | return ovl_copyfile(file_in, pos_in, file_out, pos_out, len, |
629 | remap_flags, op); | |
8ede2055 MS |
630 | } |
631 | ||
1f0cb8bc SD |
632 | static int ovl_flush(struct file *file, fl_owner_t id) |
633 | { | |
634 | struct fd real; | |
635 | const struct cred *old_cred; | |
636 | int err; | |
637 | ||
638 | err = ovl_real_fdget(file, &real); | |
639 | if (err) | |
640 | return err; | |
641 | ||
642 | if (real.file->f_op->flush) { | |
643 | old_cred = ovl_override_creds(file_inode(file)->i_sb); | |
644 | err = real.file->f_op->flush(real.file, id); | |
645 | revert_creds(old_cred); | |
646 | } | |
647 | fdput(real); | |
648 | ||
649 | return err; | |
650 | } | |
651 | ||
d1d04ef8 MS |
652 | const struct file_operations ovl_file_operations = { |
653 | .open = ovl_open, | |
654 | .release = ovl_release, | |
655 | .llseek = ovl_llseek, | |
16914e6f | 656 | .read_iter = ovl_read_iter, |
2a92e07e | 657 | .write_iter = ovl_write_iter, |
de30dfd6 | 658 | .fsync = ovl_fsync, |
2f502839 | 659 | .mmap = ovl_mmap, |
aab8848c | 660 | .fallocate = ovl_fallocate, |
b833a366 | 661 | .fadvise = ovl_fadvise, |
1f0cb8bc | 662 | .flush = ovl_flush, |
82a763e6 | 663 | .splice_read = generic_file_splice_read, |
9b91b6b0 | 664 | .splice_write = ovl_splice_write, |
8ede2055 MS |
665 | |
666 | .copy_file_range = ovl_copy_file_range, | |
2e5dfc99 | 667 | .remap_file_range = ovl_remap_file_range, |
d1d04ef8 | 668 | }; |
2406a307 JX |
669 | |
670 | int __init ovl_aio_request_cache_init(void) | |
671 | { | |
672 | ovl_aio_request_cachep = kmem_cache_create("ovl_aio_req", | |
673 | sizeof(struct ovl_aio_req), | |
674 | 0, SLAB_HWCACHE_ALIGN, NULL); | |
675 | if (!ovl_aio_request_cachep) | |
676 | return -ENOMEM; | |
677 | ||
678 | return 0; | |
679 | } | |
680 | ||
681 | void ovl_aio_request_cache_destroy(void) | |
682 | { | |
683 | kmem_cache_destroy(ovl_aio_request_cachep); | |
684 | } |