summaryrefslogtreecommitdiff
path: root/fs/9p/vfs_inode_dotl.c
blob: 6f62320eda89c951121e8e90389c1319e4b318ee (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
/*
 *  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, int 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();
}

/**
 * v9fs_dentry_from_dir_inode - helper function to get the dentry from
 * dir inode.
 *
 */

static struct dentry *v9fs_dentry_from_dir_inode(struct inode *inode)
{
	struct dentry *dentry;

	spin_lock(&inode->i_lock);
	/* Directory should have only one entry. */
	BUG_ON(S_ISDIR(inode->i_mode) && !list_is_singular(&inode->i_dentry));
	dentry = list_entry(inode->i_dentry.next, struct dentry, d_alias);
	spin_unlock(&inode->i_lock);
	return dentry;
}

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 retval;
	unsigned long i_ino;
	struct inode *inode;
	struct v9fs_session_info *v9ses = sb->s_fs_info;

	i_ino = v9fs_qid2ino(qid);
	inode = iget_locked(sb, i_ino);
	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.
	 */
	retval = v9fs_init_inode(v9ses, inode, st->st_mode);
	if (retval)
		goto error;

	v9fs_stat2inode_dotl(st, inode);
#ifdef CONFIG_9P_FSCACHE
	v9fs_vcookie_set_qid(inode, &st->qid);
	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_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid,
	struct super_block *sb)
{
	struct p9_stat_dotl *st;
	struct inode *inode = NULL;

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

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

/**
 * 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
 * @nd: path information
 *
 */

static int
v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, int omode,
		struct nameidata *nd)
{
	int err = 0;
	char *name = NULL;
	gid_t gid;
	int flags;
	mode_t mode;
	struct v9fs_session_info *v9ses;
	struct p9_fid *fid = NULL;
	struct p9_fid *dfid, *ofid, *inode_fid;
	struct file *filp;
	struct p9_qid qid;
	struct inode *inode;
	struct posix_acl *pacl = NULL, *dacl = NULL;

	v9ses = v9fs_inode2v9ses(dir);
	if (nd && nd->flags & LOOKUP_OPEN)
		flags = nd->intent.open.flags - 1;
	else {
		/*
		 * create call without LOOKUP_OPEN is due
		 * to mknod of regular files. So use mknod
		 * operation.
		 */
		return v9fs_vfs_mknod_dotl(dir, dentry, omode, 0);
	}

	name = (char *) dentry->d_name.name;
	P9_DPRINTK(P9_DEBUG_VFS, "v9fs_vfs_create_dotl: name:%s flags:0x%x "
			"mode:0x%x\n", name, flags, omode);

	dfid = v9fs_fid_lookup(dentry->d_parent);
	if (IS_ERR(dfid)) {
		err = PTR_ERR(dfid);
		P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
		return err;
	}

	/* clone a fid to use for creation */
	ofid = p9_client_walk(dfid, 0, NULL, 1);
	if (IS_ERR(ofid)) {
		err = PTR_ERR(ofid);
		P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
		return err;
	}

	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_DPRINTK(P9_DEBUG_VFS,
			   "Failed to get acl values in creat %d\n", err);
		goto error;
	}
	err = p9_client_create_dotl(ofid, name, flags, mode, gid, &qid);
	if (err < 0) {
		P9_DPRINTK(P9_DEBUG_VFS,
				"p9_client_open_dotl failed in creat %d\n",
				err);
		goto error;
	}

	/* 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_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
		fid = NULL;
		goto error;
	}
	inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
	if (IS_ERR(inode)) {
		err = PTR_ERR(inode);
		P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err);
		goto error;
	}
	d_instantiate(dentry, inode);
	err = v9fs_fid_add(dentry, fid);
	if (err < 0)
		goto error;

	/* Now set the ACL based on the default value */
	v9fs_set_create_acl(dentry, dacl, pacl);
	if (v9ses->cache && !inode->i_private) {
		/*
		 * clone a fid and add it to inode->i_private
		 * 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);
			goto error;
		}
		inode->i_private = (void *) inode_fid;
	}
	/* Since we are opening a file, assign the open fid to the file */
	filp = lookup_instantiate_filp(nd, dentry, generic_file_open);
	if (IS_ERR(filp)) {
		p9_client_clunk(ofid);
		return PTR_ERR(filp);
	}
	filp->private_data = ofid;
#ifdef CONFIG_9P_FSCACHE
	if (v9ses->cache)
		v9fs_cache_inode_set_cookie(inode, filp);
#endif
	return 0;

error:
	if (ofid)
		p9_client_clunk(ofid);
	if (fid)
		p9_client_clunk(fid);
	return err;
}

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

	P9_DPRINTK(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 = v9fs_dentry_from_dir_inode(dir);
	dfid = v9fs_fid_lookup(dir_dentry);
	if (IS_ERR(dfid)) {
		err = PTR_ERR(dfid);
		P9_DPRINTK(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_DPRINTK(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_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
				err);
			fid = NULL;
			goto error;
		}

		inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
		if (IS_ERR(inode)) {
			err = PTR_ERR(inode);
			P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
				err);
			goto error;
		}
		d_instantiate(dentry, inode);
		err = v9fs_fid_add(dentry, fid);
		if (err < 0)
			goto error;
		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);
		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);
	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_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry);
	err = -EPERM;
	v9ses = v9fs_inode2v9ses(dentry->d_inode);
	if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
		return simple_getattr(mnt, dentry, stat);

	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;
}

/**
 * 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_DPRINTK(P9_DEBUG_VFS, "\n");

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

	p9attr.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_inode2v9ses(dentry->d_inode);
	fid = v9fs_fid_lookup(dentry);
	if (IS_ERR(fid))
		return PTR_ERR(fid);

	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)) {
		retval = vmtruncate(dentry->d_inode, iattr->ia_size);
		if (retval)
			return retval;
	}

	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)
{

	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;
		inode->i_nlink = stat->st_nlink;
		inode->i_mode = stat->st_mode;
		inode->i_rdev = new_decode_dev(stat->st_rdev);

		if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode)))
			init_special_inode(inode, inode->i_mode, inode->i_rdev);

		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)
			inode->i_nlink = 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.
	 */
}

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

	name = (char *) dentry->d_name.name;
	P9_DPRINTK(P9_DEBUG_VFS, "v9fs_vfs_symlink_dotl : %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_DPRINTK(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_DPRINTK(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
		goto error;
	}

	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_DPRINTK(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_inode_from_fid(v9ses, fid, dir->i_sb);
		if (IS_ERR(inode)) {
			err = PTR_ERR(inode);
			P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
					err);
			goto error;
		}
		d_instantiate(dentry, inode);
		err = v9fs_fid_add(dentry, fid);
		if (err < 0)
			goto error;
		fid = NULL;
	} else {
		/* Not in cached mode. No need to populate inode with stat */
		inode = v9fs_get_inode(dir->i_sb, S_IFLNK);
		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;
	struct p9_fid *dfid, *oldfid;
	char *name;
	struct v9fs_session_info *v9ses;
	struct dentry *dir_dentry;

	P9_DPRINTK(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 = v9fs_dentry_from_dir_inode(dir);
	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_DPRINTK(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
		return err;
	}

	if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
		/* Get the latest stat info from server. */
		struct p9_fid *fid;
		struct p9_stat_dotl *st;

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

		st = p9_client_getattr_dotl(fid, P9_STATS_BASIC);
		if (IS_ERR(st))
			return PTR_ERR(st);

		v9fs_stat2inode_dotl(st, old_dentry->d_inode);

		kfree(st);
	}
	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, int omode,
		dev_t rdev)
{
	int err;
	char *name;
	mode_t mode;
	struct v9fs_session_info *v9ses;
	struct p9_fid *fid = NULL, *dfid = NULL;
	struct inode *inode;
	gid_t gid;
	struct p9_qid qid;
	struct dentry *dir_dentry;
	struct posix_acl *dacl = NULL, *pacl = NULL;

	P9_DPRINTK(P9_DEBUG_VFS,
		" %lu,%s mode: %x 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 = v9fs_dentry_from_dir_inode(dir);
	dfid = v9fs_fid_lookup(dir_dentry);
	if (IS_ERR(dfid)) {
		err = PTR_ERR(dfid);
		P9_DPRINTK(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_DPRINTK(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;

	/* 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_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
				err);
			fid = NULL;
			goto error;
		}

		inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
		if (IS_ERR(inode)) {
			err = PTR_ERR(inode);
			P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
				err);
			goto error;
		}
		d_instantiate(dentry, inode);
		err = v9fs_fid_add(dentry, fid);
		if (err < 0)
			goto error;
		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);
		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);
	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_DPRINTK(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_PTR(PTR_ERR(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;
}

const struct inode_operations v9fs_dir_inode_operations_dotl = {
	.create = v9fs_vfs_create_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,
	.check_acl = v9fs_check_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,
	.check_acl = v9fs_check_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,
};