summaryrefslogtreecommitdiff
path: root/fs/aufs/vfsub.c
blob: 2e54bad6a32e736273b175abc783343bdf85a44b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
/*
 * Copyright (C) 2005-2016 Junjiro R. Okajima
 */

/*
 * sub-routines for VFS
 */

#include <linux/namei.h>
#include <linux/nsproxy.h>
#include <linux/security.h>
#include <linux/splice.h>
#include "../fs/mount.h"
#include "aufs.h"

#ifdef CONFIG_AUFS_BR_FUSE
int vfsub_test_mntns(struct vfsmount *mnt, struct super_block *h_sb)
{
	struct nsproxy *ns;

	if (!au_test_fuse(h_sb) || !au_userns)
		return 0;

	ns = current->nsproxy;
	/* no {get,put}_nsproxy(ns) */
	return real_mount(mnt)->mnt_ns == ns->mnt_ns ? 0 : -EACCES;
}
#endif

/* ---------------------------------------------------------------------- */

int vfsub_update_h_iattr(struct path *h_path, int *did)
{
	int err;
	struct kstat st;
	struct super_block *h_sb;

	/* for remote fs, leave work for its getattr or d_revalidate */
	/* for bad i_attr fs, handle them in aufs_getattr() */
	/* still some fs may acquire i_mutex. we need to skip them */
	err = 0;
	if (!did)
		did = &err;
	h_sb = h_path->dentry->d_sb;
	*did = (!au_test_fs_remote(h_sb) && au_test_fs_refresh_iattr(h_sb));
	if (*did)
		err = vfs_getattr(h_path, &st);

	return err;
}

/* ---------------------------------------------------------------------- */

struct file *vfsub_dentry_open(struct path *path, int flags)
{
	struct file *file;

	file = dentry_open(path, flags /* | __FMODE_NONOTIFY */,
			   current_cred());
	if (!IS_ERR_OR_NULL(file)
	    && (file->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ)
		i_readcount_inc(d_inode(path->dentry));

	return file;
}

struct file *vfsub_filp_open(const char *path, int oflags, int mode)
{
	struct file *file;

	lockdep_off();
	file = filp_open(path,
			 oflags /* | __FMODE_NONOTIFY */,
			 mode);
	lockdep_on();
	if (IS_ERR(file))
		goto out;
	vfsub_update_h_iattr(&file->f_path, /*did*/NULL); /*ignore*/

out:
	return file;
}

/*
 * Ideally this function should call VFS:do_last() in order to keep all its
 * checkings. But it is very hard for aufs to regenerate several VFS internal
 * structure such as nameidata. This is a second (or third) best approach.
 * cf. linux/fs/namei.c:do_last(), lookup_open() and atomic_open().
 */
int vfsub_atomic_open(struct inode *dir, struct dentry *dentry,
		      struct vfsub_aopen_args *args, struct au_branch *br)
{
	int err;
	struct file *file = args->file;
	/* copied from linux/fs/namei.c:atomic_open() */
	struct dentry *const DENTRY_NOT_SET = (void *)-1UL;

	IMustLock(dir);
	AuDebugOn(!dir->i_op->atomic_open);

	err = au_br_test_oflag(args->open_flag, br);
	if (unlikely(err))
		goto out;

	args->file->f_path.dentry = DENTRY_NOT_SET;
	args->file->f_path.mnt = au_br_mnt(br);
	err = dir->i_op->atomic_open(dir, dentry, file, args->open_flag,
				     args->create_mode, args->opened);
	if (err >= 0) {
		/* some filesystems don't set FILE_CREATED while succeeded? */
		if (*args->opened & FILE_CREATED)
			fsnotify_create(dir, dentry);
	} else
		goto out;


	if (!err) {
		/* todo: call VFS:may_open() here */
		err = open_check_o_direct(file);
		/* todo: ima_file_check() too? */
		if (!err && (args->open_flag & __FMODE_EXEC))
			err = deny_write_access(file);
		if (unlikely(err))
			/* note that the file is created and still opened */
			goto out;
	}

	au_br_get(br);
	fsnotify_open(file);

out:
	return err;
}

int vfsub_kern_path(const char *name, unsigned int flags, struct path *path)
{
	int err;

	err = kern_path(name, flags, path);
	if (!err && d_is_positive(path->dentry))
		vfsub_update_h_iattr(path, /*did*/NULL); /*ignore*/
	return err;
}

struct dentry *vfsub_lookup_one_len_unlocked(const char *name,
					     struct dentry *parent, int len)
{
	struct path path = {
		.mnt = NULL
	};

	path.dentry = lookup_one_len_unlocked(name, parent, len);
	if (IS_ERR(path.dentry))
		goto out;
	if (d_is_positive(path.dentry))
		vfsub_update_h_iattr(&path, /*did*/NULL); /*ignore*/

out:
	AuTraceErrPtr(path.dentry);
	return path.dentry;
}

struct dentry *vfsub_lookup_one_len(const char *name, struct dentry *parent,
				    int len)
{
	struct path path = {
		.mnt = NULL
	};

	/* VFS checks it too, but by WARN_ON_ONCE() */
	IMustLock(d_inode(parent));

	path.dentry = lookup_one_len(name, parent, len);
	if (IS_ERR(path.dentry))
		goto out;
	if (d_is_positive(path.dentry))
		vfsub_update_h_iattr(&path, /*did*/NULL); /*ignore*/

out:
	AuTraceErrPtr(path.dentry);
	return path.dentry;
}

void vfsub_call_lkup_one(void *args)
{
	struct vfsub_lkup_one_args *a = args;
	*a->errp = vfsub_lkup_one(a->name, a->parent);
}

/* ---------------------------------------------------------------------- */

struct dentry *vfsub_lock_rename(struct dentry *d1, struct au_hinode *hdir1,
				 struct dentry *d2, struct au_hinode *hdir2)
{
	struct dentry *d;

	lockdep_off();
	d = lock_rename(d1, d2);
	lockdep_on();
	au_hn_suspend(hdir1);
	if (hdir1 != hdir2)
		au_hn_suspend(hdir2);

	return d;
}

void vfsub_unlock_rename(struct dentry *d1, struct au_hinode *hdir1,
			 struct dentry *d2, struct au_hinode *hdir2)
{
	au_hn_resume(hdir1);
	if (hdir1 != hdir2)
		au_hn_resume(hdir2);
	lockdep_off();
	unlock_rename(d1, d2);
	lockdep_on();
}

/* ---------------------------------------------------------------------- */

int vfsub_create(struct inode *dir, struct path *path, int mode, bool want_excl)
{
	int err;
	struct dentry *d;

	IMustLock(dir);

	d = path->dentry;
	path->dentry = d->d_parent;
	err = security_path_mknod(path, d, mode, 0);
	path->dentry = d;
	if (unlikely(err))
		goto out;

	lockdep_off();
	err = vfs_create(dir, path->dentry, mode, want_excl);
	lockdep_on();
	if (!err) {
		struct path tmp = *path;
		int did;

		vfsub_update_h_iattr(&tmp, &did);
		if (did) {
			tmp.dentry = path->dentry->d_parent;
			vfsub_update_h_iattr(&tmp, /*did*/NULL);
		}
		/*ignore*/
	}

out:
	return err;
}

int vfsub_symlink(struct inode *dir, struct path *path, const char *symname)
{
	int err;
	struct dentry *d;

	IMustLock(dir);

	d = path->dentry;
	path->dentry = d->d_parent;
	err = security_path_symlink(path, d, symname);
	path->dentry = d;
	if (unlikely(err))
		goto out;

	lockdep_off();
	err = vfs_symlink(dir, path->dentry, symname);
	lockdep_on();
	if (!err) {
		struct path tmp = *path;
		int did;

		vfsub_update_h_iattr(&tmp, &did);
		if (did) {
			tmp.dentry = path->dentry->d_parent;
			vfsub_update_h_iattr(&tmp, /*did*/NULL);
		}
		/*ignore*/
	}

out:
	return err;
}

int vfsub_mknod(struct inode *dir, struct path *path, int mode, dev_t dev)
{
	int err;
	struct dentry *d;

	IMustLock(dir);

	d = path->dentry;
	path->dentry = d->d_parent;
	err = security_path_mknod(path, d, mode, new_encode_dev(dev));
	path->dentry = d;
	if (unlikely(err))
		goto out;

	lockdep_off();
	err = vfs_mknod(dir, path->dentry, mode, dev);
	lockdep_on();
	if (!err) {
		struct path tmp = *path;
		int did;

		vfsub_update_h_iattr(&tmp, &did);
		if (did) {
			tmp.dentry = path->dentry->d_parent;
			vfsub_update_h_iattr(&tmp, /*did*/NULL);
		}
		/*ignore*/
	}

out:
	return err;
}

static int au_test_nlink(struct inode *inode)
{
	const unsigned int link_max = UINT_MAX >> 1; /* rough margin */

	if (!au_test_fs_no_limit_nlink(inode->i_sb)
	    || inode->i_nlink < link_max)
		return 0;
	return -EMLINK;
}

int vfsub_link(struct dentry *src_dentry, struct inode *dir, struct path *path,
	       struct inode **delegated_inode)
{
	int err;
	struct dentry *d;

	IMustLock(dir);

	err = au_test_nlink(d_inode(src_dentry));
	if (unlikely(err))
		return err;

	/* we don't call may_linkat() */
	d = path->dentry;
	path->dentry = d->d_parent;
	err = security_path_link(src_dentry, path, d);
	path->dentry = d;
	if (unlikely(err))
		goto out;

	lockdep_off();
	err = vfs_link(src_dentry, dir, path->dentry, delegated_inode);
	lockdep_on();
	if (!err) {
		struct path tmp = *path;
		int did;

		/* fuse has different memory inode for the same inumber */
		vfsub_update_h_iattr(&tmp, &did);
		if (did) {
			tmp.dentry = path->dentry->d_parent;
			vfsub_update_h_iattr(&tmp, /*did*/NULL);
			tmp.dentry = src_dentry;
			vfsub_update_h_iattr(&tmp, /*did*/NULL);
		}
		/*ignore*/
	}

out:
	return err;
}

int vfsub_rename(struct inode *src_dir, struct dentry *src_dentry,
		 struct inode *dir, struct path *path,
		 struct inode **delegated_inode)
{
	int err;
	struct path tmp = {
		.mnt	= path->mnt
	};
	struct dentry *d;

	IMustLock(dir);
	IMustLock(src_dir);

	d = path->dentry;
	path->dentry = d->d_parent;
	tmp.dentry = src_dentry->d_parent;
	err = security_path_rename(&tmp, src_dentry, path, d, /*flags*/0);
	path->dentry = d;
	if (unlikely(err))
		goto out;

	lockdep_off();
	err = vfs_rename(src_dir, src_dentry, dir, path->dentry,
			 delegated_inode, /*flags*/0);
	lockdep_on();
	if (!err) {
		int did;

		tmp.dentry = d->d_parent;
		vfsub_update_h_iattr(&tmp, &did);
		if (did) {
			tmp.dentry = src_dentry;
			vfsub_update_h_iattr(&tmp, /*did*/NULL);
			tmp.dentry = src_dentry->d_parent;
			vfsub_update_h_iattr(&tmp, /*did*/NULL);
		}
		/*ignore*/
	}

out:
	return err;
}

int vfsub_mkdir(struct inode *dir, struct path *path, int mode)
{
	int err;
	struct dentry *d;

	IMustLock(dir);

	d = path->dentry;
	path->dentry = d->d_parent;
	err = security_path_mkdir(path, d, mode);
	path->dentry = d;
	if (unlikely(err))
		goto out;

	lockdep_off();
	err = vfs_mkdir(dir, path->dentry, mode);
	lockdep_on();
	if (!err) {
		struct path tmp = *path;
		int did;

		vfsub_update_h_iattr(&tmp, &did);
		if (did) {
			tmp.dentry = path->dentry->d_parent;
			vfsub_update_h_iattr(&tmp, /*did*/NULL);
		}
		/*ignore*/
	}

out:
	return err;
}

int vfsub_rmdir(struct inode *dir, struct path *path)
{
	int err;
	struct dentry *d;

	IMustLock(dir);

	d = path->dentry;
	path->dentry = d->d_parent;
	err = security_path_rmdir(path, d);
	path->dentry = d;
	if (unlikely(err))
		goto out;

	lockdep_off();
	err = vfs_rmdir(dir, path->dentry);
	lockdep_on();
	if (!err) {
		struct path tmp = {
			.dentry	= path->dentry->d_parent,
			.mnt	= path->mnt
		};

		vfsub_update_h_iattr(&tmp, /*did*/NULL); /*ignore*/
	}

out:
	return err;
}

/* ---------------------------------------------------------------------- */

/* todo: support mmap_sem? */
ssize_t vfsub_read_u(struct file *file, char __user *ubuf, size_t count,
		     loff_t *ppos)
{
	ssize_t err;

	lockdep_off();
	err = vfs_read(file, ubuf, count, ppos);
	lockdep_on();
	if (err >= 0)
		vfsub_update_h_iattr(&file->f_path, /*did*/NULL); /*ignore*/
	return err;
}

/* todo: kernel_read()? */
ssize_t vfsub_read_k(struct file *file, void *kbuf, size_t count,
		     loff_t *ppos)
{
	ssize_t err;
	mm_segment_t oldfs;
	union {
		void *k;
		char __user *u;
	} buf;

	buf.k = kbuf;
	oldfs = get_fs();
	set_fs(KERNEL_DS);
	err = vfsub_read_u(file, buf.u, count, ppos);
	set_fs(oldfs);
	return err;
}

ssize_t vfsub_write_u(struct file *file, const char __user *ubuf, size_t count,
		      loff_t *ppos)
{
	ssize_t err;

	lockdep_off();
	err = vfs_write(file, ubuf, count, ppos);
	lockdep_on();
	if (err >= 0)
		vfsub_update_h_iattr(&file->f_path, /*did*/NULL); /*ignore*/
	return err;
}

ssize_t vfsub_write_k(struct file *file, void *kbuf, size_t count, loff_t *ppos)
{
	ssize_t err;
	mm_segment_t oldfs;
	union {
		void *k;
		const char __user *u;
	} buf;

	buf.k = kbuf;
	oldfs = get_fs();
	set_fs(KERNEL_DS);
	err = vfsub_write_u(file, buf.u, count, ppos);
	set_fs(oldfs);
	return err;
}

int vfsub_flush(struct file *file, fl_owner_t id)
{
	int err;

	err = 0;
	if (file->f_op->flush) {
		if (!au_test_nfs(file->f_path.dentry->d_sb))
			err = file->f_op->flush(file, id);
		else {
			lockdep_off();
			err = file->f_op->flush(file, id);
			lockdep_on();
		}
		if (!err)
			vfsub_update_h_iattr(&file->f_path, /*did*/NULL);
		/*ignore*/
	}
	return err;
}

int vfsub_iterate_dir(struct file *file, struct dir_context *ctx)
{
	int err;

	AuDbg("%pD, ctx{%pf, %llu}\n", file, ctx->actor, ctx->pos);

	lockdep_off();
	err = iterate_dir(file, ctx);
	lockdep_on();
	if (err >= 0)
		vfsub_update_h_iattr(&file->f_path, /*did*/NULL); /*ignore*/
	return err;
}

long vfsub_splice_to(struct file *in, loff_t *ppos,
		     struct pipe_inode_info *pipe, size_t len,
		     unsigned int flags)
{
	long err;

	lockdep_off();
	err = do_splice_to(in, ppos, pipe, len, flags);
	lockdep_on();
	file_accessed(in);
	if (err >= 0)
		vfsub_update_h_iattr(&in->f_path, /*did*/NULL); /*ignore*/
	return err;
}

long vfsub_splice_from(struct pipe_inode_info *pipe, struct file *out,
		       loff_t *ppos, size_t len, unsigned int flags)
{
	long err;

	lockdep_off();
	err = do_splice_from(pipe, out, ppos, len, flags);
	lockdep_on();
	if (err >= 0)
		vfsub_update_h_iattr(&out->f_path, /*did*/NULL); /*ignore*/
	return err;
}

int vfsub_fsync(struct file *file, struct path *path, int datasync)
{
	int err;

	/* file can be NULL */
	lockdep_off();
	err = vfs_fsync(file, datasync);
	lockdep_on();
	if (!err) {
		if (!path) {
			AuDebugOn(!file);
			path = &file->f_path;
		}
		vfsub_update_h_iattr(path, /*did*/NULL); /*ignore*/
	}
	return err;
}

/* cf. open.c:do_sys_truncate() and do_sys_ftruncate() */
int vfsub_trunc(struct path *h_path, loff_t length, unsigned int attr,
		struct file *h_file)
{
	int err;
	struct inode *h_inode;
	struct super_block *h_sb;

	if (!h_file) {
		err = vfsub_truncate(h_path, length);
		goto out;
	}

	h_inode = d_inode(h_path->dentry);
	h_sb = h_inode->i_sb;
	lockdep_off();
	sb_start_write(h_sb);
	lockdep_on();
	err = locks_verify_truncate(h_inode, h_file, length);
	if (!err)
		err = security_path_truncate(h_path);
	if (!err) {
		lockdep_off();
		err = do_truncate(h_path->dentry, length, attr, h_file);
		lockdep_on();
	}
	lockdep_off();
	sb_end_write(h_sb);
	lockdep_on();

out:
	return err;
}

/* ---------------------------------------------------------------------- */

struct au_vfsub_mkdir_args {
	int *errp;
	struct inode *dir;
	struct path *path;
	int mode;
};

static void au_call_vfsub_mkdir(void *args)
{
	struct au_vfsub_mkdir_args *a = args;
	*a->errp = vfsub_mkdir(a->dir, a->path, a->mode);
}

int vfsub_sio_mkdir(struct inode *dir, struct path *path, int mode)
{
	int err, do_sio, wkq_err;

	do_sio = au_test_h_perm_sio(dir, MAY_EXEC | MAY_WRITE);
	if (!do_sio) {
		lockdep_off();
		err = vfsub_mkdir(dir, path, mode);
		lockdep_on();
	} else {
		struct au_vfsub_mkdir_args args = {
			.errp	= &err,
			.dir	= dir,
			.path	= path,
			.mode	= mode
		};
		wkq_err = au_wkq_wait(au_call_vfsub_mkdir, &args);
		if (unlikely(wkq_err))
			err = wkq_err;
	}

	return err;
}

struct au_vfsub_rmdir_args {
	int *errp;
	struct inode *dir;
	struct path *path;
};

static void au_call_vfsub_rmdir(void *args)
{
	struct au_vfsub_rmdir_args *a = args;
	*a->errp = vfsub_rmdir(a->dir, a->path);
}

int vfsub_sio_rmdir(struct inode *dir, struct path *path)
{
	int err, do_sio, wkq_err;

	do_sio = au_test_h_perm_sio(dir, MAY_EXEC | MAY_WRITE);
	if (!do_sio) {
		lockdep_off();
		err = vfsub_rmdir(dir, path);
		lockdep_on();
	} else {
		struct au_vfsub_rmdir_args args = {
			.errp	= &err,
			.dir	= dir,
			.path	= path
		};
		wkq_err = au_wkq_wait(au_call_vfsub_rmdir, &args);
		if (unlikely(wkq_err))
			err = wkq_err;
	}

	return err;
}

/* ---------------------------------------------------------------------- */

struct notify_change_args {
	int *errp;
	struct path *path;
	struct iattr *ia;
	struct inode **delegated_inode;
};

static void call_notify_change(void *args)
{
	struct notify_change_args *a = args;
	struct inode *h_inode;

	h_inode = d_inode(a->path->dentry);
	IMustLock(h_inode);

	*a->errp = -EPERM;
	if (!IS_IMMUTABLE(h_inode) && !IS_APPEND(h_inode)) {
		lockdep_off();
		*a->errp = notify_change(a->path->dentry, a->ia,
					 a->delegated_inode);
		lockdep_on();
		if (!*a->errp)
			vfsub_update_h_iattr(a->path, /*did*/NULL); /*ignore*/
	}
	AuTraceErr(*a->errp);
}

int vfsub_notify_change(struct path *path, struct iattr *ia,
			struct inode **delegated_inode)
{
	int err;
	struct notify_change_args args = {
		.errp			= &err,
		.path			= path,
		.ia			= ia,
		.delegated_inode	= delegated_inode
	};

	call_notify_change(&args);

	return err;
}

int vfsub_sio_notify_change(struct path *path, struct iattr *ia,
			    struct inode **delegated_inode)
{
	int err, wkq_err;
	struct notify_change_args args = {
		.errp			= &err,
		.path			= path,
		.ia			= ia,
		.delegated_inode	= delegated_inode
	};

	wkq_err = au_wkq_wait(call_notify_change, &args);
	if (unlikely(wkq_err))
		err = wkq_err;

	return err;
}

/* ---------------------------------------------------------------------- */

struct unlink_args {
	int *errp;
	struct inode *dir;
	struct path *path;
	struct inode **delegated_inode;
};

static void call_unlink(void *args)
{
	struct unlink_args *a = args;
	struct dentry *d = a->path->dentry;
	struct inode *h_inode;
	const int stop_sillyrename = (au_test_nfs(d->d_sb)
				      && au_dcount(d) == 1);

	IMustLock(a->dir);

	a->path->dentry = d->d_parent;
	*a->errp = security_path_unlink(a->path, d);
	a->path->dentry = d;
	if (unlikely(*a->errp))
		return;

	if (!stop_sillyrename)
		dget(d);
	h_inode = NULL;
	if (d_is_positive(d)) {
		h_inode = d_inode(d);
		ihold(h_inode);
	}

	lockdep_off();
	*a->errp = vfs_unlink(a->dir, d, a->delegated_inode);
	lockdep_on();
	if (!*a->errp) {
		struct path tmp = {
			.dentry = d->d_parent,
			.mnt	= a->path->mnt
		};
		vfsub_update_h_iattr(&tmp, /*did*/NULL); /*ignore*/
	}

	if (!stop_sillyrename)
		dput(d);
	if (h_inode)
		iput(h_inode);

	AuTraceErr(*a->errp);
}

/*
 * @dir: must be locked.
 * @dentry: target dentry.
 */
int vfsub_unlink(struct inode *dir, struct path *path,
		 struct inode **delegated_inode, int force)
{
	int err;
	struct unlink_args args = {
		.errp			= &err,
		.dir			= dir,
		.path			= path,
		.delegated_inode	= delegated_inode
	};

	if (!force)
		call_unlink(&args);
	else {
		int wkq_err;

		wkq_err = au_wkq_wait(call_unlink, &args);
		if (unlikely(wkq_err))
			err = wkq_err;
	}

	return err;
}