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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2017 Red Hat, Inc.
4 */
5
6#include <linux/cred.h>
7#include <linux/file.h>
8#include <linux/mount.h>
9#include <linux/xattr.h>
10#include <linux/uio.h>
11#include <linux/uaccess.h>
12#include <linux/splice.h>
13#include <linux/security.h>
14#include <linux/mm.h>
15#include <linux/fs.h>
16#include "overlayfs.h"
17
18struct ovl_aio_req {
19 struct kiocb iocb;
20 struct kiocb *orig_iocb;
21 struct fd fd;
22};
23
24static struct kmem_cache *ovl_aio_request_cachep;
25
26static 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
36/* No atime modificaton nor notify on underlying */
37#define OVL_OPEN_FLAGS (O_NOATIME | FMODE_NONOTIFY)
38
39static struct file *ovl_open_realfile(const struct file *file,
40 struct inode *realinode)
41{
42 struct inode *inode = file_inode(file);
43 struct file *realfile;
44 const struct cred *old_cred;
45 int flags = file->f_flags | OVL_OPEN_FLAGS;
46 int acc_mode = ACC_MODE(flags);
47 int err;
48
49 if (flags & O_APPEND)
50 acc_mode |= MAY_APPEND;
51
52 old_cred = ovl_override_creds(inode->i_sb);
53 err = inode_permission(realinode, MAY_OPEN | acc_mode);
54 if (err) {
55 realfile = ERR_PTR(err);
56 } else if (!inode_owner_or_capable(realinode)) {
57 realfile = ERR_PTR(-EPERM);
58 } else {
59 realfile = open_with_fake_path(&file->f_path, flags, realinode,
60 current_cred());
61 }
62 revert_creds(old_cred);
63
64 pr_debug("open(%p[%pD2/%c], 0%o) -> (%p, 0%o)\n",
65 file, file, ovl_whatisit(inode, realinode), file->f_flags,
66 realfile, IS_ERR(realfile) ? 0 : realfile->f_flags);
67
68 return realfile;
69}
70
71#define OVL_SETFL_MASK (O_APPEND | O_NONBLOCK | O_NDELAY | O_DIRECT)
72
73static int ovl_change_flags(struct file *file, unsigned int flags)
74{
75 struct inode *inode = file_inode(file);
76 int err;
77
78 flags |= OVL_OPEN_FLAGS;
79
80 /* If some flag changed that cannot be changed then something's amiss */
81 if (WARN_ON((file->f_flags ^ flags) & ~OVL_SETFL_MASK))
82 return -EIO;
83
84 flags &= OVL_SETFL_MASK;
85
86 if (((flags ^ file->f_flags) & O_APPEND) && IS_APPEND(inode))
87 return -EPERM;
88
89 if (flags & O_DIRECT) {
90 if (!file->f_mapping->a_ops ||
91 !file->f_mapping->a_ops->direct_IO)
92 return -EINVAL;
93 }
94
95 if (file->f_op->check_flags) {
96 err = file->f_op->check_flags(flags);
97 if (err)
98 return err;
99 }
100
101 spin_lock(&file->f_lock);
102 file->f_flags = (file->f_flags & ~OVL_SETFL_MASK) | flags;
103 spin_unlock(&file->f_lock);
104
105 return 0;
106}
107
108static int ovl_real_fdget_meta(const struct file *file, struct fd *real,
109 bool allow_meta)
110{
111 struct inode *inode = file_inode(file);
112 struct inode *realinode;
113
114 real->flags = 0;
115 real->file = file->private_data;
116
117 if (allow_meta)
118 realinode = ovl_inode_real(inode);
119 else
120 realinode = ovl_inode_realdata(inode);
121
122 /* Has it been copied up since we'd opened it? */
123 if (unlikely(file_inode(real->file) != realinode)) {
124 real->flags = FDPUT_FPUT;
125 real->file = ovl_open_realfile(file, realinode);
126
127 return PTR_ERR_OR_ZERO(real->file);
128 }
129
130 /* Did the flags change since open? */
131 if (unlikely((file->f_flags ^ real->file->f_flags) & ~OVL_OPEN_FLAGS))
132 return ovl_change_flags(real->file, file->f_flags);
133
134 return 0;
135}
136
137static int ovl_real_fdget(const struct file *file, struct fd *real)
138{
139 return ovl_real_fdget_meta(file, real, false);
140}
141
142static int ovl_open(struct inode *inode, struct file *file)
143{
144 struct file *realfile;
145 int err;
146
147 err = ovl_maybe_copy_up(file_dentry(file), file->f_flags);
148 if (err)
149 return err;
150
151 /* No longer need these flags, so don't pass them on to underlying fs */
152 file->f_flags &= ~(O_CREAT | O_EXCL | O_NOCTTY | O_TRUNC);
153
154 realfile = ovl_open_realfile(file, ovl_inode_realdata(inode));
155 if (IS_ERR(realfile))
156 return PTR_ERR(realfile);
157
158 file->private_data = realfile;
159
160 return 0;
161}
162
163static int ovl_release(struct inode *inode, struct file *file)
164{
165 fput(file->private_data);
166
167 return 0;
168}
169
170static loff_t ovl_llseek(struct file *file, loff_t offset, int whence)
171{
172 struct inode *inode = file_inode(file);
173 struct fd real;
174 const struct cred *old_cred;
175 loff_t ret;
176
177 /*
178 * The two special cases below do not need to involve real fs,
179 * so we can optimizing concurrent callers.
180 */
181 if (offset == 0) {
182 if (whence == SEEK_CUR)
183 return file->f_pos;
184
185 if (whence == SEEK_SET)
186 return vfs_setpos(file, 0, 0);
187 }
188
189 ret = ovl_real_fdget(file, &real);
190 if (ret)
191 return ret;
192
193 /*
194 * Overlay file f_pos is the master copy that is preserved
195 * through copy up and modified on read/write, but only real
196 * fs knows how to SEEK_HOLE/SEEK_DATA and real fs may impose
197 * limitations that are more strict than ->s_maxbytes for specific
198 * files, so we use the real file to perform seeks.
199 */
200 ovl_inode_lock(inode);
201 real.file->f_pos = file->f_pos;
202
203 old_cred = ovl_override_creds(inode->i_sb);
204 ret = vfs_llseek(real.file, offset, whence);
205 revert_creds(old_cred);
206
207 file->f_pos = real.file->f_pos;
208 ovl_inode_unlock(inode);
209
210 fdput(real);
211
212 return ret;
213}
214
215static void ovl_file_accessed(struct file *file)
216{
217 struct inode *inode, *upperinode;
218
219 if (file->f_flags & O_NOATIME)
220 return;
221
222 inode = file_inode(file);
223 upperinode = ovl_inode_upper(inode);
224
225 if (!upperinode)
226 return;
227
228 if ((!timespec64_equal(&inode->i_mtime, &upperinode->i_mtime) ||
229 !timespec64_equal(&inode->i_ctime, &upperinode->i_ctime))) {
230 inode->i_mtime = upperinode->i_mtime;
231 inode->i_ctime = upperinode->i_ctime;
232 }
233
234 touch_atime(&file->f_path);
235}
236
237static rwf_t ovl_iocb_to_rwf(int ifl)
238{
239 rwf_t flags = 0;
240
241 if (ifl & IOCB_NOWAIT)
242 flags |= RWF_NOWAIT;
243 if (ifl & IOCB_HIPRI)
244 flags |= RWF_HIPRI;
245 if (ifl & IOCB_DSYNC)
246 flags |= RWF_DSYNC;
247 if (ifl & IOCB_SYNC)
248 flags |= RWF_SYNC;
249
250 return flags;
251}
252
253static void ovl_aio_cleanup_handler(struct ovl_aio_req *aio_req)
254{
255 struct kiocb *iocb = &aio_req->iocb;
256 struct kiocb *orig_iocb = aio_req->orig_iocb;
257
258 if (iocb->ki_flags & IOCB_WRITE) {
259 struct inode *inode = file_inode(orig_iocb->ki_filp);
260
261 /* Actually acquired in ovl_write_iter() */
262 __sb_writers_acquired(file_inode(iocb->ki_filp)->i_sb,
263 SB_FREEZE_WRITE);
264 file_end_write(iocb->ki_filp);
265 ovl_copyattr(ovl_inode_real(inode), inode);
266 }
267
268 orig_iocb->ki_pos = iocb->ki_pos;
269 fdput(aio_req->fd);
270 kmem_cache_free(ovl_aio_request_cachep, aio_req);
271}
272
273static void ovl_aio_rw_complete(struct kiocb *iocb, long res, long res2)
274{
275 struct ovl_aio_req *aio_req = container_of(iocb,
276 struct ovl_aio_req, iocb);
277 struct kiocb *orig_iocb = aio_req->orig_iocb;
278
279 ovl_aio_cleanup_handler(aio_req);
280 orig_iocb->ki_complete(orig_iocb, res, res2);
281}
282
283static ssize_t ovl_read_iter(struct kiocb *iocb, struct iov_iter *iter)
284{
285 struct file *file = iocb->ki_filp;
286 struct fd real;
287 const struct cred *old_cred;
288 ssize_t ret;
289
290 if (!iov_iter_count(iter))
291 return 0;
292
293 ret = ovl_real_fdget(file, &real);
294 if (ret)
295 return ret;
296
297 old_cred = ovl_override_creds(file_inode(file)->i_sb);
298 if (is_sync_kiocb(iocb)) {
299 ret = vfs_iter_read(real.file, iter, &iocb->ki_pos,
300 ovl_iocb_to_rwf(iocb->ki_flags));
301 } else {
302 struct ovl_aio_req *aio_req;
303
304 ret = -ENOMEM;
305 aio_req = kmem_cache_zalloc(ovl_aio_request_cachep, GFP_KERNEL);
306 if (!aio_req)
307 goto out;
308
309 aio_req->fd = real;
310 real.flags = 0;
311 aio_req->orig_iocb = iocb;
312 kiocb_clone(&aio_req->iocb, iocb, real.file);
313 aio_req->iocb.ki_complete = ovl_aio_rw_complete;
314 ret = vfs_iocb_iter_read(real.file, &aio_req->iocb, iter);
315 if (ret != -EIOCBQUEUED)
316 ovl_aio_cleanup_handler(aio_req);
317 }
318out:
319 revert_creds(old_cred);
320 ovl_file_accessed(file);
321
322 fdput(real);
323
324 return ret;
325}
326
327static ssize_t ovl_write_iter(struct kiocb *iocb, struct iov_iter *iter)
328{
329 struct file *file = iocb->ki_filp;
330 struct inode *inode = file_inode(file);
331 struct fd real;
332 const struct cred *old_cred;
333 ssize_t ret;
334
335 if (!iov_iter_count(iter))
336 return 0;
337
338 inode_lock(inode);
339 /* Update mode */
340 ovl_copyattr(ovl_inode_real(inode), inode);
341 ret = file_remove_privs(file);
342 if (ret)
343 goto out_unlock;
344
345 ret = ovl_real_fdget(file, &real);
346 if (ret)
347 goto out_unlock;
348
349 old_cred = ovl_override_creds(file_inode(file)->i_sb);
350 if (is_sync_kiocb(iocb)) {
351 file_start_write(real.file);
352 ret = vfs_iter_write(real.file, iter, &iocb->ki_pos,
353 ovl_iocb_to_rwf(iocb->ki_flags));
354 file_end_write(real.file);
355 /* Update size */
356 ovl_copyattr(ovl_inode_real(inode), inode);
357 } else {
358 struct ovl_aio_req *aio_req;
359
360 ret = -ENOMEM;
361 aio_req = kmem_cache_zalloc(ovl_aio_request_cachep, GFP_KERNEL);
362 if (!aio_req)
363 goto out;
364
365 file_start_write(real.file);
366 /* Pacify lockdep, same trick as done in aio_write() */
367 __sb_writers_release(file_inode(real.file)->i_sb,
368 SB_FREEZE_WRITE);
369 aio_req->fd = real;
370 real.flags = 0;
371 aio_req->orig_iocb = iocb;
372 kiocb_clone(&aio_req->iocb, iocb, real.file);
373 aio_req->iocb.ki_complete = ovl_aio_rw_complete;
374 ret = vfs_iocb_iter_write(real.file, &aio_req->iocb, iter);
375 if (ret != -EIOCBQUEUED)
376 ovl_aio_cleanup_handler(aio_req);
377 }
378out:
379 revert_creds(old_cred);
380 fdput(real);
381
382out_unlock:
383 inode_unlock(inode);
384
385 return ret;
386}
387
388static ssize_t ovl_splice_read(struct file *in, loff_t *ppos,
389 struct pipe_inode_info *pipe, size_t len,
390 unsigned int flags)
391{
392 ssize_t ret;
393 struct fd real;
394 const struct cred *old_cred;
395
396 ret = ovl_real_fdget(in, &real);
397 if (ret)
398 return ret;
399
400 old_cred = ovl_override_creds(file_inode(in)->i_sb);
401 ret = generic_file_splice_read(real.file, ppos, pipe, len, flags);
402 revert_creds(old_cred);
403
404 ovl_file_accessed(in);
405 fdput(real);
406 return ret;
407}
408
409static ssize_t
410ovl_splice_write(struct pipe_inode_info *pipe, struct file *out,
411 loff_t *ppos, size_t len, unsigned int flags)
412{
413 struct fd real;
414 const struct cred *old_cred;
415 ssize_t ret;
416
417 ret = ovl_real_fdget(out, &real);
418 if (ret)
419 return ret;
420
421 old_cred = ovl_override_creds(file_inode(out)->i_sb);
422 ret = iter_file_splice_write(pipe, real.file, ppos, len, flags);
423 revert_creds(old_cred);
424
425 ovl_file_accessed(out);
426 fdput(real);
427 return ret;
428}
429
430static int ovl_fsync(struct file *file, loff_t start, loff_t end, int datasync)
431{
432 struct fd real;
433 const struct cred *old_cred;
434 int ret;
435
436 ret = ovl_real_fdget_meta(file, &real, !datasync);
437 if (ret)
438 return ret;
439
440 /* Don't sync lower file for fear of receiving EROFS error */
441 if (file_inode(real.file) == ovl_inode_upper(file_inode(file))) {
442 old_cred = ovl_override_creds(file_inode(file)->i_sb);
443 ret = vfs_fsync_range(real.file, start, end, datasync);
444 revert_creds(old_cred);
445 }
446
447 fdput(real);
448
449 return ret;
450}
451
452static int ovl_mmap(struct file *file, struct vm_area_struct *vma)
453{
454 struct file *realfile = file->private_data;
455 const struct cred *old_cred;
456 int ret;
457
458 if (!realfile->f_op->mmap)
459 return -ENODEV;
460
461 if (WARN_ON(file != vma->vm_file))
462 return -EIO;
463
464 vma->vm_file = get_file(realfile);
465
466 old_cred = ovl_override_creds(file_inode(file)->i_sb);
467 ret = call_mmap(vma->vm_file, vma);
468 revert_creds(old_cred);
469
470 if (ret) {
471 /* Drop reference count from new vm_file value */
472 fput(realfile);
473 } else {
474 /* Drop reference count from previous vm_file value */
475 fput(file);
476 }
477
478 ovl_file_accessed(file);
479
480 return ret;
481}
482
483static long ovl_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
484{
485 struct inode *inode = file_inode(file);
486 struct fd real;
487 const struct cred *old_cred;
488 int ret;
489
490 ret = ovl_real_fdget(file, &real);
491 if (ret)
492 return ret;
493
494 old_cred = ovl_override_creds(file_inode(file)->i_sb);
495 ret = vfs_fallocate(real.file, mode, offset, len);
496 revert_creds(old_cred);
497
498 /* Update size */
499 ovl_copyattr(ovl_inode_real(inode), inode);
500
501 fdput(real);
502
503 return ret;
504}
505
506static int ovl_fadvise(struct file *file, loff_t offset, loff_t len, int advice)
507{
508 struct fd real;
509 const struct cred *old_cred;
510 int ret;
511
512 ret = ovl_real_fdget(file, &real);
513 if (ret)
514 return ret;
515
516 old_cred = ovl_override_creds(file_inode(file)->i_sb);
517 ret = vfs_fadvise(real.file, offset, len, advice);
518 revert_creds(old_cred);
519
520 fdput(real);
521
522 return ret;
523}
524
525static long ovl_real_ioctl(struct file *file, unsigned int cmd,
526 unsigned long arg)
527{
528 struct fd real;
529 const struct cred *old_cred;
530 long ret;
531
532 ret = ovl_real_fdget(file, &real);
533 if (ret)
534 return ret;
535
536 old_cred = ovl_override_creds(file_inode(file)->i_sb);
537 ret = security_file_ioctl(real.file, cmd, arg);
538 if (!ret)
539 ret = vfs_ioctl(real.file, cmd, arg);
540 revert_creds(old_cred);
541
542 fdput(real);
543
544 return ret;
545}
546
547static long ovl_ioctl_set_flags(struct file *file, unsigned int cmd,
548 unsigned long arg, unsigned int iflags)
549{
550 long ret;
551 struct inode *inode = file_inode(file);
552 unsigned int old_iflags;
553
554 if (!inode_owner_or_capable(inode))
555 return -EACCES;
556
557 ret = mnt_want_write_file(file);
558 if (ret)
559 return ret;
560
561 inode_lock(inode);
562
563 /* Check the capability before cred override */
564 ret = -EPERM;
565 old_iflags = READ_ONCE(inode->i_flags);
566 if (((iflags ^ old_iflags) & (S_APPEND | S_IMMUTABLE)) &&
567 !capable(CAP_LINUX_IMMUTABLE))
568 goto unlock;
569
570 ret = ovl_maybe_copy_up(file_dentry(file), O_WRONLY);
571 if (ret)
572 goto unlock;
573
574 ret = ovl_real_ioctl(file, cmd, arg);
575
576 ovl_copyflags(ovl_inode_real(inode), inode);
577unlock:
578 inode_unlock(inode);
579
580 mnt_drop_write_file(file);
581
582 return ret;
583
584}
585
586static unsigned int ovl_fsflags_to_iflags(unsigned int flags)
587{
588 unsigned int iflags = 0;
589
590 if (flags & FS_SYNC_FL)
591 iflags |= S_SYNC;
592 if (flags & FS_APPEND_FL)
593 iflags |= S_APPEND;
594 if (flags & FS_IMMUTABLE_FL)
595 iflags |= S_IMMUTABLE;
596 if (flags & FS_NOATIME_FL)
597 iflags |= S_NOATIME;
598
599 return iflags;
600}
601
602static long ovl_ioctl_set_fsflags(struct file *file, unsigned int cmd,
603 unsigned long arg)
604{
605 unsigned int flags;
606
607 if (get_user(flags, (int __user *) arg))
608 return -EFAULT;
609
610 return ovl_ioctl_set_flags(file, cmd, arg,
611 ovl_fsflags_to_iflags(flags));
612}
613
614static unsigned int ovl_fsxflags_to_iflags(unsigned int xflags)
615{
616 unsigned int iflags = 0;
617
618 if (xflags & FS_XFLAG_SYNC)
619 iflags |= S_SYNC;
620 if (xflags & FS_XFLAG_APPEND)
621 iflags |= S_APPEND;
622 if (xflags & FS_XFLAG_IMMUTABLE)
623 iflags |= S_IMMUTABLE;
624 if (xflags & FS_XFLAG_NOATIME)
625 iflags |= S_NOATIME;
626
627 return iflags;
628}
629
630static long ovl_ioctl_set_fsxflags(struct file *file, unsigned int cmd,
631 unsigned long arg)
632{
633 struct fsxattr fa;
634
635 memset(&fa, 0, sizeof(fa));
636 if (copy_from_user(&fa, (void __user *) arg, sizeof(fa)))
637 return -EFAULT;
638
639 return ovl_ioctl_set_flags(file, cmd, arg,
640 ovl_fsxflags_to_iflags(fa.fsx_xflags));
641}
642
643static long ovl_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
644{
645 long ret;
646
647 switch (cmd) {
648 case FS_IOC_GETFLAGS:
649 case FS_IOC_FSGETXATTR:
650 ret = ovl_real_ioctl(file, cmd, arg);
651 break;
652
653 case FS_IOC_SETFLAGS:
654 ret = ovl_ioctl_set_fsflags(file, cmd, arg);
655 break;
656
657 case FS_IOC_FSSETXATTR:
658 ret = ovl_ioctl_set_fsxflags(file, cmd, arg);
659 break;
660
661 default:
662 ret = -ENOTTY;
663 }
664
665 return ret;
666}
667
668static long ovl_compat_ioctl(struct file *file, unsigned int cmd,
669 unsigned long arg)
670{
671 switch (cmd) {
672 case FS_IOC32_GETFLAGS:
673 cmd = FS_IOC_GETFLAGS;
674 break;
675
676 case FS_IOC32_SETFLAGS:
677 cmd = FS_IOC_SETFLAGS;
678 break;
679
680 default:
681 return -ENOIOCTLCMD;
682 }
683
684 return ovl_ioctl(file, cmd, arg);
685}
686
687enum ovl_copyop {
688 OVL_COPY,
689 OVL_CLONE,
690 OVL_DEDUPE,
691};
692
693static loff_t ovl_copyfile(struct file *file_in, loff_t pos_in,
694 struct file *file_out, loff_t pos_out,
695 loff_t len, unsigned int flags, enum ovl_copyop op)
696{
697 struct inode *inode_out = file_inode(file_out);
698 struct fd real_in, real_out;
699 const struct cred *old_cred;
700 loff_t ret;
701
702 ret = ovl_real_fdget(file_out, &real_out);
703 if (ret)
704 return ret;
705
706 ret = ovl_real_fdget(file_in, &real_in);
707 if (ret) {
708 fdput(real_out);
709 return ret;
710 }
711
712 old_cred = ovl_override_creds(file_inode(file_out)->i_sb);
713 switch (op) {
714 case OVL_COPY:
715 ret = vfs_copy_file_range(real_in.file, pos_in,
716 real_out.file, pos_out, len, flags);
717 break;
718
719 case OVL_CLONE:
720 ret = vfs_clone_file_range(real_in.file, pos_in,
721 real_out.file, pos_out, len, flags);
722 break;
723
724 case OVL_DEDUPE:
725 ret = vfs_dedupe_file_range_one(real_in.file, pos_in,
726 real_out.file, pos_out, len,
727 flags);
728 break;
729 }
730 revert_creds(old_cred);
731
732 /* Update size */
733 ovl_copyattr(ovl_inode_real(inode_out), inode_out);
734
735 fdput(real_in);
736 fdput(real_out);
737
738 return ret;
739}
740
741static ssize_t ovl_copy_file_range(struct file *file_in, loff_t pos_in,
742 struct file *file_out, loff_t pos_out,
743 size_t len, unsigned int flags)
744{
745 return ovl_copyfile(file_in, pos_in, file_out, pos_out, len, flags,
746 OVL_COPY);
747}
748
749static loff_t ovl_remap_file_range(struct file *file_in, loff_t pos_in,
750 struct file *file_out, loff_t pos_out,
751 loff_t len, unsigned int remap_flags)
752{
753 enum ovl_copyop op;
754
755 if (remap_flags & ~(REMAP_FILE_DEDUP | REMAP_FILE_ADVISORY))
756 return -EINVAL;
757
758 if (remap_flags & REMAP_FILE_DEDUP)
759 op = OVL_DEDUPE;
760 else
761 op = OVL_CLONE;
762
763 /*
764 * Don't copy up because of a dedupe request, this wouldn't make sense
765 * most of the time (data would be duplicated instead of deduplicated).
766 */
767 if (op == OVL_DEDUPE &&
768 (!ovl_inode_upper(file_inode(file_in)) ||
769 !ovl_inode_upper(file_inode(file_out))))
770 return -EPERM;
771
772 return ovl_copyfile(file_in, pos_in, file_out, pos_out, len,
773 remap_flags, op);
774}
775
776const struct file_operations ovl_file_operations = {
777 .open = ovl_open,
778 .release = ovl_release,
779 .llseek = ovl_llseek,
780 .read_iter = ovl_read_iter,
781 .write_iter = ovl_write_iter,
782 .fsync = ovl_fsync,
783 .mmap = ovl_mmap,
784 .fallocate = ovl_fallocate,
785 .fadvise = ovl_fadvise,
786 .unlocked_ioctl = ovl_ioctl,
787 .compat_ioctl = ovl_compat_ioctl,
788 .splice_read = ovl_splice_read,
789 .splice_write = ovl_splice_write,
790
791 .copy_file_range = ovl_copy_file_range,
792 .remap_file_range = ovl_remap_file_range,
793};
794
795int __init ovl_aio_request_cache_init(void)
796{
797 ovl_aio_request_cachep = kmem_cache_create("ovl_aio_req",
798 sizeof(struct ovl_aio_req),
799 0, SLAB_HWCACHE_ALIGN, NULL);
800 if (!ovl_aio_request_cachep)
801 return -ENOMEM;
802
803 return 0;
804}
805
806void ovl_aio_request_cache_destroy(void)
807{
808 kmem_cache_destroy(ovl_aio_request_cachep);
809}