aboutsummaryrefslogtreecommitdiff
path: root/fs/9p/vfs_inode_dotl.c
blob: a354fe2cb234991abd9f504decc8d6ff22f4341b (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
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
/*
 *  linux/fs/9p/vfs_inode_dotl.c
 *
 * This file contains vfs inode ops for the 9P2000.L protocol.
 *
 *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
 *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2
 *  as published by the Free Software Foundation.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to:
 *  Free Software Foundation
 *  51 Franklin Street, Fifth Floor
 *  Boston, MA  02111-1301  USA
 *
 */

#include <linux/module.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/pagemap.h>
#include <linux/stat.h>
#include <linux/string.h>
#include <linux/inet.h>
#include <linux/namei.h>
#include <linux/idr.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/xattr.h>
#include <linux/posix_acl.h>
#include <net/9p/9p.h>
#include <net/9p/client.h>

#include "v9fs.h"
#include "v9fs_vfs.h"
#include "fid.h"
#include "cache.h"
#include "xattr.h"
#include "acl.h"

static int
v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
		    dev_t rdev);

/**
 * v9fs_get_fsgid_for_create - Helper function to get the gid for creating a
 * new file system object. This checks the S_ISGID to determine the owning
 * group of the new file system object.
 */

static gid_t v9fs_get_fsgid_for_create(struct inode *dir_inode)
{
	BUG_ON(dir_inode == NULL);

	if (dir_inode->i_mode & S_ISGID) {
		/* set_gid bit is set.*/
		return dir_inode->i_gid;
	}
	return current_fsgid();
}

static int v9fs_test_inode_dotl(struct inode *inode, void *data)
{
	struct v9fs_inode *v9inode = V9FS_I(inode);
	struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;

	/* don't match inode of different type */
	if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT))
		return 0;

	if (inode->i_generation != st->st_gen)
		return 0;

	/* compare qid details */
	if (memcmp(&v9inode->qid.version,
		   &st->qid.version, sizeof(v9inode->qid.version)))
		return 0;

	if (v9inode->qid.type != st->qid.type)
		return 0;
	return 1;
}

/* Always get a new inode */
static int v9fs_test_new_inode_dotl(struct inode *inode, void *data)
{
	return 0;
}

static int v9fs_set_inode_dotl(struct inode *inode,  void *data)
{
	struct v9fs_inode *v9inode = V9FS_I(inode);
	struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;

	memcpy(&v9inode->qid, &st->qid, sizeof(st->qid));
	inode->i_generation = st->st_gen;
	return 0;
}

static struct inode *v9fs_qid_iget_dotl(struct super_block *sb,
					struct p9_qid *qid,
					struct p9_fid *fid,
					struct p9_stat_dotl *st,
					int new)
{
	int retval;
	unsigned long i_ino;
	struct inode *inode;
	struct v9fs_session_info *v9ses = sb->s_fs_info;
	int (*test)(struct inode *, void *);

	if (new)
		test = v9fs_test_new_inode_dotl;
	else
		test = v9fs_test_inode_dotl;

	i_ino = v9fs_qid2ino(qid);
	inode = iget5_locked(sb, i_ino, test, v9fs_set_inode_dotl, st);
	if (!inode)
		return ERR_PTR(-ENOMEM);
	if (!(inode->i_state & I_NEW))
		return inode;
	/*
	 * initialize the inode with the stat info
	 * FIXME!! we may need support for stale inodes
	 * later.
	 */
	inode->i_ino = i_ino;
	retval = v9fs_init_inode(v9ses, inode,
				 st->st_mode, new_decode_dev(st->st_rdev));
	if (retval)
		goto error;

	v9fs_stat2inode_dotl(st, inode);
#ifdef CONFIG_9P_FSCACHE
	v9fs_cache_inode_get_cookie(inode);
#endif
	retval = v9fs_get_acl(inode, fid);
	if (retval)
		goto error;

	unlock_new_inode(inode);
	return inode;
error:
	unlock_new_inode(inode);
	iput(inode);
	return ERR_PTR(retval);

}

struct inode *
v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid,
			 struct super_block *sb, int new)
{
	struct p9_stat_dotl *st;
	struct inode *inode = NULL;

	st = p9_client_getattr_dotl(fid, P9_STATS_BASIC | P9_STATS_GEN);
	if (IS_ERR(st))
		return ERR_CAST(st);

	inode = v9fs_qid_iget_dotl(sb, &st->qid, fid, st, new);
	kfree(st);
	return inode;
}

struct dotl_openflag_map {
	int open_flag;
	int dotl_flag;
};

static int v9fs_mapped_dotl_flags(int flags)
{
	int i;
	int rflags = 0;
	struct dotl_openflag_map dotl_oflag_map[] = {
		{ O_CREAT,	P9_DOTL_CREATE },
		{ O_EXCL,	P9_DOTL_EXCL },
		{ O_NOCTTY,	P9_DOTL_NOCTTY },
		{ O_TRUNC,	P9_DOTL_TRUNC },
		{ O_APPEND,	P9_DOTL_APPEND },
		{ O_NONBLOCK,	P9_DOTL_NONBLOCK },
		{ O_DSYNC,	P9_DOTL_DSYNC },
		{ FASYNC,	P9_DOTL_FASYNC },
		{ O_DIRECT,	P9_DOTL_DIRECT },
		{ O_LARGEFILE,	P9_DOTL_LARGEFILE },
		{ O_DIRECTORY,	P9_DOTL_DIRECTORY },
		{ O_NOFOLLOW,	P9_DOTL_NOFOLLOW },
		{ O_NOATIME,	P9_DOTL_NOATIME },
		{ O_CLOEXEC,	P9_DOTL_CLOEXEC },
		{ O_SYNC,	P9_DOTL_SYNC},
	};
	for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) {
		if (flags & dotl_oflag_map[i].open_flag)
			rflags |= dotl_oflag_map[i].dotl_flag;
	}
	return rflags;
}

/**
 * v9fs_open_to_dotl_flags- convert Linux specific open flags to
 * plan 9 open flag.
 * @flags: flags to convert
 */
int v9fs_open_to_dotl_flags(int flags)
{
	int rflags = 0;

	/*
	 * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY
	 * and P9_DOTL_NOACCESS
	 */
	rflags |= flags & O_ACCMODE;
	rflags |= v9fs_mapped_dotl_flags(flags);

	return rflags;
}

/**
 * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol.
 * @dir: directory inode that is being created
 * @dentry:  dentry that is being deleted
 * @mode: create permissions
 *
 */

static int
v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
		struct nameidata *nd)
{
	return v9fs_vfs_mknod_dotl(dir, dentry, omode, 0);
}

static struct file *
v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry,
			  struct opendata *od, unsigned flags, umode_t omode,
			  bool *created)
{
	int err = 0;
	gid_t gid;
	umode_t mode;
	char *name = NULL;
	struct file *filp;
	struct p9_qid qid;
	struct inode *inode;
	struct p9_fid *fid = NULL;
	struct v9fs_inode *v9inode;
	struct p9_fid *dfid, *ofid, *inode_fid;
	struct v9fs_session_info *v9ses;
	struct posix_acl *pacl = NULL, *dacl = NULL;
	struct dentry *res = NULL;

	if (d_unhashed(dentry)) {
		res = v9fs_vfs_lookup(dir, dentry, NULL);
		if (IS_ERR(res))
			return ERR_CAST(res);

		if (res)
			dentry = res;
	}

	/* Only creates */
	if (!(flags & O_CREAT) || dentry->d_inode) {
		finish_no_open(od, res);
		return NULL;
	}

	v9ses = v9fs_inode2v9ses(dir);

	name = (char *) dentry->d_name.name;
	p9_debug(P9_DEBUG_VFS, "name:%s flags:0x%x mode:0x%hx\n",
		 name, flags, omode);

	dfid = v9fs_fid_lookup(dentry->d_parent);
	if (IS_ERR(dfid)) {
		err = PTR_ERR(dfid);
		p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
		goto err_return;
	}

	/* clone a fid to use for creation */
	ofid = p9_client_walk(dfid, 0, NULL, 1);
	if (IS_ERR(ofid)) {
		err = PTR_ERR(ofid);
		p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
		goto err_return;
	}

	gid = v9fs_get_fsgid_for_create(dir);

	mode = omode;
	/* Update mode based on ACL value */
	err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
	if (err) {
		p9_debug(P9_DEBUG_VFS, "Failed to get acl values in creat %d\n",
			 err);
		goto error;
	}
	err = p9_client_create_dotl(ofid, name, v9fs_open_to_dotl_flags(flags),
				    mode, gid, &qid);
	if (err < 0) {
		p9_debug(P9_DEBUG_VFS, "p9_client_open_dotl failed in creat %d\n",
			 err);
		goto error;
	}
	v9fs_invalidate_inode_attr(dir);

	/* instantiate inode and assign the unopened fid to the dentry */
	fid = p9_client_walk(dfid, 1, &name, 1);
	if (IS_ERR(fid)) {
		err = PTR_ERR(fid);
		p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
		fid = NULL;
		goto error;
	}
	inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
	if (IS_ERR(inode)) {
		err = PTR_ERR(inode);
		p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", err);
		goto error;
	}
	err = v9fs_fid_add(dentry, fid);
	if (err < 0)
		goto error;
	d_instantiate(dentry, inode);

	/* Now set the ACL based on the default value */
	v9fs_set_create_acl(dentry, &dacl, &pacl);

	v9inode = V9FS_I(inode);
	mutex_lock(&v9inode->v_mutex);
	if (v9ses->cache && !v9inode->writeback_fid &&
	    ((flags & O_ACCMODE) != O_RDONLY)) {
		/*
		 * clone a fid and add it to writeback_fid
		 * we do it during open time instead of
		 * page dirty time via write_begin/page_mkwrite
		 * because we want write after unlink usecase
		 * to work.
		 */
		inode_fid = v9fs_writeback_fid(dentry);
		if (IS_ERR(inode_fid)) {
			err = PTR_ERR(inode_fid);
			mutex_unlock(&v9inode->v_mutex);
			goto err_clunk_old_fid;
		}
		v9inode->writeback_fid = (void *) inode_fid;
	}
	mutex_unlock(&v9inode->v_mutex);
	/* Since we are opening a file, assign the open fid to the file */
	filp = finish_open(od, dentry, generic_file_open);
	if (IS_ERR(filp)) {
		err = PTR_ERR(filp);
		goto err_clunk_old_fid;
	}
	filp->private_data = ofid;
#ifdef CONFIG_9P_FSCACHE
	if (v9ses->cache)
		v9fs_cache_inode_set_cookie(inode, filp);
#endif
	*created = true;
out:
	dput(res);
	return filp;

error:
	if (fid)
		p9_client_clunk(fid);
err_clunk_old_fid:
	if (ofid)
		p9_client_clunk(ofid);
	v9fs_set_create_acl(NULL, &dacl, &pacl);
err_return:
	filp = ERR_PTR(err);
	goto out;
}

/**
 * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
 * @dir:  inode that is being unlinked
 * @dentry: dentry that is being unlinked
 * @mode: mode for new directory
 *
 */

static int v9fs_vfs_mkdir_dotl(struct inode *dir,
			       struct dentry *dentry, umode_t omode)
{
	int err;
	struct v9fs_session_info *v9ses;
	struct p9_fid *fid = NULL, *dfid = NULL;
	gid_t gid;
	char *name;
	umode_t mode;
	struct inode *inode;
	struct p9_qid qid;
	struct dentry *dir_dentry;
	struct posix_acl *dacl = NULL, *pacl = NULL;

	p9_debug(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
	err = 0;
	v9ses = v9fs_inode2v9ses(dir);

	omode |= S_IFDIR;
	if (dir->i_mode & S_ISGID)
		omode |= S_ISGID;

	dir_dentry = dentry->d_parent;
	dfid = v9fs_fid_lookup(dir_dentry);
	if (IS_ERR(dfid)) {
		err = PTR_ERR(dfid);
		p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
		dfid = NULL;
		goto error;
	}

	gid = v9fs_get_fsgid_for_create(dir);
	mode = omode;
	/* Update mode based on ACL value */
	err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
	if (err) {
		p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mkdir %d\n",
			 err);
		goto error;
	}
	name = (char *) dentry->d_name.name;
	err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
	if (err < 0)
		goto error;

	/* instantiate inode and assign the unopened fid to the dentry */
	if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
		fid = p9_client_walk(dfid, 1, &name, 1);
		if (IS_ERR(fid)) {
			err = PTR_ERR(fid);
			p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
				 err);
			fid = NULL;
			goto error;
		}

		inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
		if (IS_ERR(inode)) {
			err = PTR_ERR(inode);
			p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
				 err);
			goto error;
		}
		err = v9fs_fid_add(dentry, fid);
		if (err < 0)
			goto error;
		d_instantiate(dentry, inode);
		fid = NULL;
	} else {
		/*
		 * Not in cached mode. No need to populate
		 * inode with stat. We need to get an inode
		 * so that we can set the acl with dentry
		 */
		inode = v9fs_get_inode(dir->i_sb, mode, 0);
		if (IS_ERR(inode)) {
			err = PTR_ERR(inode);
			goto error;
		}
		d_instantiate(dentry, inode);
	}
	/* Now set the ACL based on the default value */
	v9fs_set_create_acl(dentry, &dacl, &pacl);
	inc_nlink(dir);
	v9fs_invalidate_inode_attr(dir);
error:
	if (fid)
		p9_client_clunk(fid);
	v9fs_set_create_acl(NULL, &dacl, &pacl);
	return err;
}

static int
v9fs_vfs_getattr_dotl(struct vfsmount *mnt, struct dentry *dentry,
		 struct kstat *stat)
{
	int err;
	struct v9fs_session_info *v9ses;
	struct p9_fid *fid;
	struct p9_stat_dotl *st;

	p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
	err = -EPERM;
	v9ses = v9fs_dentry2v9ses(dentry);
	if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
		generic_fillattr(dentry->d_inode, stat);
		return 0;
	}
	fid = v9fs_fid_lookup(dentry);
	if (IS_ERR(fid))
		return PTR_ERR(fid);

	/* Ask for all the fields in stat structure. Server will return
	 * whatever it supports
	 */

	st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
	if (IS_ERR(st))
		return PTR_ERR(st);

	v9fs_stat2inode_dotl(st, dentry->d_inode);
	generic_fillattr(dentry->d_inode, stat);
	/* Change block size to what the server returned */
	stat->blksize = st->st_blksize;

	kfree(st);
	return 0;
}

/*
 * Attribute flags.
 */
#define P9_ATTR_MODE		(1 << 0)
#define P9_ATTR_UID		(1 << 1)
#define P9_ATTR_GID		(1 << 2)
#define P9_ATTR_SIZE		(1 << 3)
#define P9_ATTR_ATIME		(1 << 4)
#define P9_ATTR_MTIME		(1 << 5)
#define P9_ATTR_CTIME		(1 << 6)
#define P9_ATTR_ATIME_SET	(1 << 7)
#define P9_ATTR_MTIME_SET	(1 << 8)

struct dotl_iattr_map {
	int iattr_valid;
	int p9_iattr_valid;
};

static int v9fs_mapped_iattr_valid(int iattr_valid)
{
	int i;
	int p9_iattr_valid = 0;
	struct dotl_iattr_map dotl_iattr_map[] = {
		{ ATTR_MODE,		P9_ATTR_MODE },
		{ ATTR_UID,		P9_ATTR_UID },
		{ ATTR_GID,		P9_ATTR_GID },
		{ ATTR_SIZE,		P9_ATTR_SIZE },
		{ ATTR_ATIME,		P9_ATTR_ATIME },
		{ ATTR_MTIME,		P9_ATTR_MTIME },
		{ ATTR_CTIME,		P9_ATTR_CTIME },
		{ ATTR_ATIME_SET,	P9_ATTR_ATIME_SET },
		{ ATTR_MTIME_SET,	P9_ATTR_MTIME_SET },
	};
	for (i = 0; i < ARRAY_SIZE(dotl_iattr_map); i++) {
		if (iattr_valid & dotl_iattr_map[i].iattr_valid)
			p9_iattr_valid |= dotl_iattr_map[i].p9_iattr_valid;
	}
	return p9_iattr_valid;
}

/**
 * v9fs_vfs_setattr_dotl - set file metadata
 * @dentry: file whose metadata to set
 * @iattr: metadata assignment structure
 *
 */

int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr)
{
	int retval;
	struct v9fs_session_info *v9ses;
	struct p9_fid *fid;
	struct p9_iattr_dotl p9attr;

	p9_debug(P9_DEBUG_VFS, "\n");

	retval = inode_change_ok(dentry->d_inode, iattr);
	if (retval)
		return retval;

	p9attr.valid = v9fs_mapped_iattr_valid(iattr->ia_valid);
	p9attr.mode = iattr->ia_mode;
	p9attr.uid = iattr->ia_uid;
	p9attr.gid = iattr->ia_gid;
	p9attr.size = iattr->ia_size;
	p9attr.atime_sec = iattr->ia_atime.tv_sec;
	p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
	p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
	p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;

	retval = -EPERM;
	v9ses = v9fs_dentry2v9ses(dentry);
	fid = v9fs_fid_lookup(dentry);
	if (IS_ERR(fid))
		return PTR_ERR(fid);

	/* Write all dirty data */
	if (S_ISREG(dentry->d_inode->i_mode))
		filemap_write_and_wait(dentry->d_inode->i_mapping);

	retval = p9_client_setattr(fid, &p9attr);
	if (retval < 0)
		return retval;

	if ((iattr->ia_valid & ATTR_SIZE) &&
	    iattr->ia_size != i_size_read(dentry->d_inode))
		truncate_setsize(dentry->d_inode, iattr->ia_size);

	v9fs_invalidate_inode_attr(dentry->d_inode);
	setattr_copy(dentry->d_inode, iattr);
	mark_inode_dirty(dentry->d_inode);
	if (iattr->ia_valid & ATTR_MODE) {
		/* We also want to update ACL when we update mode bits */
		retval = v9fs_acl_chmod(dentry);
		if (retval < 0)
			return retval;
	}
	return 0;
}

/**
 * v9fs_stat2inode_dotl - populate an inode structure with stat info
 * @stat: stat structure
 * @inode: inode to populate
 * @sb: superblock of filesystem
 *
 */

void
v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode)
{
	umode_t mode;
	struct v9fs_inode *v9inode = V9FS_I(inode);

	if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
		inode->i_atime.tv_sec = stat->st_atime_sec;
		inode->i_atime.tv_nsec = stat->st_atime_nsec;
		inode->i_mtime.tv_sec = stat->st_mtime_sec;
		inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
		inode->i_ctime.tv_sec = stat->st_ctime_sec;
		inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
		inode->i_uid = stat->st_uid;
		inode->i_gid = stat->st_gid;
		set_nlink(inode, stat->st_nlink);

		mode = stat->st_mode & S_IALLUGO;
		mode |= inode->i_mode & ~S_IALLUGO;
		inode->i_mode = mode;

		i_size_write(inode, stat->st_size);
		inode->i_blocks = stat->st_blocks;
	} else {
		if (stat->st_result_mask & P9_STATS_ATIME) {
			inode->i_atime.tv_sec = stat->st_atime_sec;
			inode->i_atime.tv_nsec = stat->st_atime_nsec;
		}
		if (stat->st_result_mask & P9_STATS_MTIME) {
			inode->i_mtime.tv_sec = stat->st_mtime_sec;
			inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
		}
		if (stat->st_result_mask & P9_STATS_CTIME) {
			inode->i_ctime.tv_sec = stat->st_ctime_sec;
			inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
		}
		if (stat->st_result_mask & P9_STATS_UID)
			inode->i_uid = stat->st_uid;
		if (stat->st_result_mask & P9_STATS_GID)
			inode->i_gid = stat->st_gid;
		if (stat->st_result_mask & P9_STATS_NLINK)
			set_nlink(inode, stat->st_nlink);
		if (stat->st_result_mask & P9_STATS_MODE) {
			inode->i_mode = stat->st_mode;
			if ((S_ISBLK(inode->i_mode)) ||
						(S_ISCHR(inode->i_mode)))
				init_special_inode(inode, inode->i_mode,
								inode->i_rdev);
		}
		if (stat->st_result_mask & P9_STATS_RDEV)
			inode->i_rdev = new_decode_dev(stat->st_rdev);
		if (stat->st_result_mask & P9_STATS_SIZE)
			i_size_write(inode, stat->st_size);
		if (stat->st_result_mask & P9_STATS_BLOCKS)
			inode->i_blocks = stat->st_blocks;
	}
	if (stat->st_result_mask & P9_STATS_GEN)
		inode->i_generation = stat->st_gen;

	/* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
	 * because the inode structure does not have fields for them.
	 */
	v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
}

static int
v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry,
		const char *symname)
{
	int err;
	gid_t gid;
	char *name;
	struct p9_qid qid;
	struct inode *inode;
	struct p9_fid *dfid;
	struct p9_fid *fid = NULL;
	struct v9fs_session_info *v9ses;

	name = (char *) dentry->d_name.name;
	p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname);
	v9ses = v9fs_inode2v9ses(dir);

	dfid = v9fs_fid_lookup(dentry->d_parent);
	if (IS_ERR(dfid)) {
		err = PTR_ERR(dfid);
		p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
		return err;
	}

	gid = v9fs_get_fsgid_for_create(dir);

	/* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
	err = p9_client_symlink(dfid, name, (char *)symname, gid, &qid);

	if (err < 0) {
		p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
		goto error;
	}

	v9fs_invalidate_inode_attr(dir);
	if (v9ses->cache) {
		/* Now walk from the parent so we can get an unopened fid. */
		fid = p9_client_walk(dfid, 1, &name, 1);
		if (IS_ERR(fid)) {
			err = PTR_ERR(fid);
			p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
				 err);
			fid = NULL;
			goto error;
		}

		/* instantiate inode and assign the unopened fid to dentry */
		inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
		if (IS_ERR(inode)) {
			err = PTR_ERR(inode);
			p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
				 err);
			goto error;
		}
		err = v9fs_fid_add(dentry, fid);
		if (err < 0)
			goto error;
		d_instantiate(dentry, inode);
		fid = NULL;
	} else {
		/* Not in cached mode. No need to populate inode with stat */
		inode = v9fs_get_inode(dir->i_sb, S_IFLNK, 0);
		if (IS_ERR(inode)) {
			err = PTR_ERR(inode);
			goto error;
		}
		d_instantiate(dentry, inode);
	}

error:
	if (fid)
		p9_client_clunk(fid);

	return err;
}

/**
 * v9fs_vfs_link_dotl - create a hardlink for dotl
 * @old_dentry: dentry for file to link to
 * @dir: inode destination for new link
 * @dentry: dentry for link
 *
 */

static int
v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
		struct dentry *dentry)
{
	int err;
	char *name;
	struct dentry *dir_dentry;
	struct p9_fid *dfid, *oldfid;
	struct v9fs_session_info *v9ses;

	p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %s, new_name: %s\n",
		 dir->i_ino, old_dentry->d_name.name, dentry->d_name.name);

	v9ses = v9fs_inode2v9ses(dir);
	dir_dentry = dentry->d_parent;
	dfid = v9fs_fid_lookup(dir_dentry);
	if (IS_ERR(dfid))
		return PTR_ERR(dfid);

	oldfid = v9fs_fid_lookup(old_dentry);
	if (IS_ERR(oldfid))
		return PTR_ERR(oldfid);

	name = (char *) dentry->d_name.name;

	err = p9_client_link(dfid, oldfid, (char *)dentry->d_name.name);

	if (err < 0) {
		p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
		return err;
	}

	v9fs_invalidate_inode_attr(dir);
	if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
		/* Get the latest stat info from server. */
		struct p9_fid *fid;
		fid = v9fs_fid_lookup(old_dentry);
		if (IS_ERR(fid))
			return PTR_ERR(fid);

		v9fs_refresh_inode_dotl(fid, old_dentry->d_inode);
	}
	ihold(old_dentry->d_inode);
	d_instantiate(dentry, old_dentry->d_inode);

	return err;
}

/**
 * v9fs_vfs_mknod_dotl - create a special file
 * @dir: inode destination for new link
 * @dentry: dentry for file
 * @mode: mode for creation
 * @rdev: device associated with special file
 *
 */
static int
v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
		dev_t rdev)
{
	int err;
	gid_t gid;
	char *name;
	umode_t mode;
	struct v9fs_session_info *v9ses;
	struct p9_fid *fid = NULL, *dfid = NULL;
	struct inode *inode;
	struct p9_qid qid;
	struct dentry *dir_dentry;
	struct posix_acl *dacl = NULL, *pacl = NULL;

	p9_debug(P9_DEBUG_VFS, " %lu,%s mode: %hx MAJOR: %u MINOR: %u\n",
		 dir->i_ino, dentry->d_name.name, omode,
		 MAJOR(rdev), MINOR(rdev));

	if (!new_valid_dev(rdev))
		return -EINVAL;

	v9ses = v9fs_inode2v9ses(dir);
	dir_dentry = dentry->d_parent;
	dfid = v9fs_fid_lookup(dir_dentry);
	if (IS_ERR(dfid)) {
		err = PTR_ERR(dfid);
		p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
		dfid = NULL;
		goto error;
	}

	gid = v9fs_get_fsgid_for_create(dir);
	mode = omode;
	/* Update mode based on ACL value */
	err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
	if (err) {
		p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n",
			 err);
		goto error;
	}
	name = (char *) dentry->d_name.name;

	err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
	if (err < 0)
		goto error;

	v9fs_invalidate_inode_attr(dir);
	/* instantiate inode and assign the unopened fid to the dentry */
	if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
		fid = p9_client_walk(dfid, 1, &name, 1);
		if (IS_ERR(fid)) {
			err = PTR_ERR(fid);
			p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
				 err);
			fid = NULL;
			goto error;
		}

		inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
		if (IS_ERR(inode)) {
			err = PTR_ERR(inode);
			p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
				 err);
			goto error;
		}
		err = v9fs_fid_add(dentry, fid);
		if (err < 0)
			goto error;
		d_instantiate(dentry, inode);
		fid = NULL;
	} else {
		/*
		 * Not in cached mode. No need to populate inode with stat.
		 * socket syscall returns a fd, so we need instantiate
		 */
		inode = v9fs_get_inode(dir->i_sb, mode, rdev);
		if (IS_ERR(inode)) {
			err = PTR_ERR(inode);
			goto error;
		}
		d_instantiate(dentry, inode);
	}
	/* Now set the ACL based on the default value */
	v9fs_set_create_acl(dentry, &dacl, &pacl);
error:
	if (fid)
		p9_client_clunk(fid);
	v9fs_set_create_acl(NULL, &dacl, &pacl);
	return err;
}

/**
 * v9fs_vfs_follow_link_dotl - follow a symlink path
 * @dentry: dentry for symlink
 * @nd: nameidata
 *
 */

static void *
v9fs_vfs_follow_link_dotl(struct dentry *dentry, struct nameidata *nd)
{
	int retval;
	struct p9_fid *fid;
	char *link = __getname();
	char *target;

	p9_debug(P9_DEBUG_VFS, "%s\n", dentry->d_name.name);

	if (!link) {
		link = ERR_PTR(-ENOMEM);
		goto ndset;
	}
	fid = v9fs_fid_lookup(dentry);
	if (IS_ERR(fid)) {
		__putname(link);
		link = ERR_CAST(fid);
		goto ndset;
	}
	retval = p9_client_readlink(fid, &target);
	if (!retval) {
		strcpy(link, target);
		kfree(target);
		goto ndset;
	}
	__putname(link);
	link = ERR_PTR(retval);
ndset:
	nd_set_link(nd, link);
	return NULL;
}

int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode)
{
	loff_t i_size;
	struct p9_stat_dotl *st;
	struct v9fs_session_info *v9ses;

	v9ses = v9fs_inode2v9ses(inode);
	st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
	if (IS_ERR(st))
		return PTR_ERR(st);
	/*
	 * Don't update inode if the file type is different
	 */
	if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT))
		goto out;

	spin_lock(&inode->i_lock);
	/*
	 * We don't want to refresh inode->i_size,
	 * because we may have cached data
	 */
	i_size = inode->i_size;
	v9fs_stat2inode_dotl(st, inode);
	if (v9ses->cache)
		inode->i_size = i_size;
	spin_unlock(&inode->i_lock);
out:
	kfree(st);
	return 0;
}

const struct inode_operations v9fs_dir_inode_operations_dotl = {
	.create = v9fs_vfs_create_dotl,
	.atomic_open = v9fs_vfs_atomic_open_dotl,
	.lookup = v9fs_vfs_lookup,
	.link = v9fs_vfs_link_dotl,
	.symlink = v9fs_vfs_symlink_dotl,
	.unlink = v9fs_vfs_unlink,
	.mkdir = v9fs_vfs_mkdir_dotl,
	.rmdir = v9fs_vfs_rmdir,
	.mknod = v9fs_vfs_mknod_dotl,
	.rename = v9fs_vfs_rename,
	.getattr = v9fs_vfs_getattr_dotl,
	.setattr = v9fs_vfs_setattr_dotl,
	.setxattr = generic_setxattr,
	.getxattr = generic_getxattr,
	.removexattr = generic_removexattr,
	.listxattr = v9fs_listxattr,
	.get_acl = v9fs_iop_get_acl,
};

const struct inode_operations v9fs_file_inode_operations_dotl = {
	.getattr = v9fs_vfs_getattr_dotl,
	.setattr = v9fs_vfs_setattr_dotl,
	.setxattr = generic_setxattr,
	.getxattr = generic_getxattr,
	.removexattr = generic_removexattr,
	.listxattr = v9fs_listxattr,
	.get_acl = v9fs_iop_get_acl,
};

const struct inode_operations v9fs_symlink_inode_operations_dotl = {
	.readlink = generic_readlink,
	.follow_link = v9fs_vfs_follow_link_dotl,
	.put_link = v9fs_vfs_put_link,
	.getattr = v9fs_vfs_getattr_dotl,
	.setattr = v9fs_vfs_setattr_dotl,
	.setxattr = generic_setxattr,
	.getxattr = generic_getxattr,
	.removexattr = generic_removexattr,
	.listxattr = v9fs_listxattr,
};