summaryrefslogtreecommitdiffstats
path: root/fs/cifs/dir.c
blob: b97ff48b7df6aa8b56e252ec56075519ebbb94e6 (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
/*
 *   fs/cifs/dir.c
 *
 *   vfs operations that deal with dentries
 *
 *   Copyright (C) International Business Machines  Corp., 2002,2009
 *   Author(s): Steve French (sfrench@us.ibm.com)
 *
 *   This library is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU Lesser General Public License as published
 *   by the Free Software Foundation; either version 2.1 of the License, or
 *   (at your option) any later version.
 *
 *   This library 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 Lesser General Public License for more details.
 *
 *   You should have received a copy of the GNU Lesser General Public License
 *   along with this library; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
#include <linux/fs.h>
#include <linux/stat.h>
#include <linux/slab.h>
#include <linux/namei.h>
#include <linux/mount.h>
#include <linux/file.h>
#include "cifsfs.h"
#include "cifspdu.h"
#include "cifsglob.h"
#include "cifsproto.h"
#include "cifs_debug.h"
#include "cifs_fs_sb.h"

static void
renew_parental_timestamps(struct dentry *direntry)
{
	/* BB check if there is a way to get the kernel to do this or if we
	   really need this */
	do {
		direntry->d_time = jiffies;
		direntry = direntry->d_parent;
	} while (!IS_ROOT(direntry));
}

/* Note: caller must free return buffer */
char *
build_path_from_dentry(struct dentry *direntry)
{
	struct dentry *temp;
	int namelen;
	int dfsplen;
	char *full_path;
	char dirsep;
	struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
	struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
	unsigned seq;

	dirsep = CIFS_DIR_SEP(cifs_sb);
	if (tcon->Flags & SMB_SHARE_IS_IN_DFS)
		dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1);
	else
		dfsplen = 0;
cifs_bp_rename_retry:
	namelen = dfsplen;
	seq = read_seqbegin(&rename_lock);
	rcu_read_lock();
	for (temp = direntry; !IS_ROOT(temp);) {
		namelen += (1 + temp->d_name.len);
		temp = temp->d_parent;
		if (temp == NULL) {
			cERROR(1, "corrupt dentry");
			rcu_read_unlock();
			return NULL;
		}
	}
	rcu_read_unlock();

	full_path = kmalloc(namelen+1, GFP_KERNEL);
	if (full_path == NULL)
		return full_path;
	full_path[namelen] = 0;	/* trailing null */
	rcu_read_lock();
	for (temp = direntry; !IS_ROOT(temp);) {
		spin_lock(&temp->d_lock);
		namelen -= 1 + temp->d_name.len;
		if (namelen < 0) {
			spin_unlock(&temp->d_lock);
			break;
		} else {
			full_path[namelen] = dirsep;
			strncpy(full_path + namelen + 1, temp->d_name.name,
				temp->d_name.len);
			cFYI(0, "name: %s", full_path + namelen);
		}
		spin_unlock(&temp->d_lock);
		temp = temp->d_parent;
		if (temp == NULL) {
			cERROR(1, "corrupt dentry");
			rcu_read_unlock();
			kfree(full_path);
			return NULL;
		}
	}
	rcu_read_unlock();
	if (namelen != dfsplen || read_seqretry(&rename_lock, seq)) {
		cFYI(1, "did not end path lookup where expected. namelen=%d "
			"dfsplen=%d", namelen, dfsplen);
		/* presumably this is only possible if racing with a rename
		of one of the parent directories  (we can not lock the dentries
		above us to prevent this, but retrying should be harmless) */
		kfree(full_path);
		goto cifs_bp_rename_retry;
	}
	/* DIR_SEP already set for byte  0 / vs \ but not for
	   subsequent slashes in prepath which currently must
	   be entered the right way - not sure if there is an alternative
	   since the '\' is a valid posix character so we can not switch
	   those safely to '/' if any are found in the middle of the prepath */
	/* BB test paths to Windows with '/' in the midst of prepath */

	if (dfsplen) {
		strncpy(full_path, tcon->treeName, dfsplen);
		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
			int i;
			for (i = 0; i < dfsplen; i++) {
				if (full_path[i] == '\\')
					full_path[i] = '/';
			}
		}
	}
	return full_path;
}

/*
 * Don't allow the separator character in a path component.
 * The VFS will not allow "/", but "\" is allowed by posix.
 */
static int
check_name(struct dentry *direntry)
{
	struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
	int i;

	if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)) {
		for (i = 0; i < direntry->d_name.len; i++) {
			if (direntry->d_name.name[i] == '\\') {
				cFYI(1, "Invalid file name");
				return -EINVAL;
			}
		}
	}
	return 0;
}


/* Inode operations in similar order to how they appear in Linux file fs.h */

static int cifs_do_create(struct inode *inode, struct dentry *direntry,
			  int xid, struct tcon_link *tlink, unsigned oflags,
			  umode_t mode, __u32 *oplock, __u16 *fileHandle,
			  int *created)
{
	int rc = -ENOENT;
	int create_options = CREATE_NOT_DIR;
	int desiredAccess;
	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
	struct cifs_tcon *tcon = tlink_tcon(tlink);
	char *full_path = NULL;
	FILE_ALL_INFO *buf = NULL;
	struct inode *newinode = NULL;
	int disposition;

	*oplock = 0;
	if (tcon->ses->server->oplocks)
		*oplock = REQ_OPLOCK;

	full_path = build_path_from_dentry(direntry);
	if (full_path == NULL) {
		rc = -ENOMEM;
		goto out;
	}

	if (tcon->unix_ext && (tcon->ses->capabilities & CAP_UNIX) &&
	    !tcon->broken_posix_open &&
	    (CIFS_UNIX_POSIX_PATH_OPS_CAP &
			le64_to_cpu(tcon->fsUnixInfo.Capability))) {
		rc = cifs_posix_open(full_path, &newinode,
			inode->i_sb, mode, oflags, oplock, fileHandle, xid);
		switch (rc) {
		case 0:
			if (newinode == NULL) {
				/* query inode info */
				goto cifs_create_get_file_info;
			}

			if (!S_ISREG(newinode->i_mode)) {
				/*
				 * The server may allow us to open things like
				 * FIFOs, but the client isn't set up to deal
				 * with that. If it's not a regular file, just
				 * close it and proceed as if it were a normal
				 * lookup.
				 */
				CIFSSMBClose(xid, tcon, *fileHandle);
				goto cifs_create_get_file_info;
			}
			/* success, no need to query */
			goto cifs_create_set_dentry;

		case -ENOENT:
			goto cifs_create_get_file_info;

		case -EIO:
		case -EINVAL:
			/*
			 * EIO could indicate that (posix open) operation is not
			 * supported, despite what server claimed in capability
			 * negotiation.
			 *
			 * POSIX open in samba versions 3.3.1 and earlier could
			 * incorrectly fail with invalid parameter.
			 */
			tcon->broken_posix_open = true;
			break;

		case -EREMOTE:
		case -EOPNOTSUPP:
			/*
			 * EREMOTE indicates DFS junction, which is not handled
			 * in posix open.  If either that or op not supported
			 * returned, follow the normal lookup.
			 */
			break;

		default:
			goto out;
		}
		/*
		 * fallthrough to retry, using older open call, this is case
		 * where server does not support this SMB level, and falsely
		 * claims capability (also get here for DFS case which should be
		 * rare for path not covered on files)
		 */
	}

	desiredAccess = 0;
	if (OPEN_FMODE(oflags) & FMODE_READ)
		desiredAccess |= GENERIC_READ; /* is this too little? */
	if (OPEN_FMODE(oflags) & FMODE_WRITE)
		desiredAccess |= GENERIC_WRITE;

	disposition = FILE_OVERWRITE_IF;
	if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
		disposition = FILE_CREATE;
	else if ((oflags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
		disposition = FILE_OVERWRITE_IF;
	else if ((oflags & O_CREAT) == O_CREAT)
		disposition = FILE_OPEN_IF;
	else
		cFYI(1, "Create flag not set in create function");

	/* BB add processing to set equivalent of mode - e.g. via CreateX with
	   ACLs */

	buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
	if (buf == NULL) {
		rc = -ENOMEM;
		goto out;
	}

	/*
	 * if we're not using unix extensions, see if we need to set
	 * ATTR_READONLY on the create call
	 */
	if (!tcon->unix_ext && (mode & S_IWUGO) == 0)
		create_options |= CREATE_OPTION_READONLY;

	if (backup_cred(cifs_sb))
		create_options |= CREATE_OPEN_BACKUP_INTENT;

	if (tcon->ses->capabilities & CAP_NT_SMBS)
		rc = CIFSSMBOpen(xid, tcon, full_path, disposition,
			 desiredAccess, create_options,
			 fileHandle, oplock, buf, cifs_sb->local_nls,
			 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
	else
		rc = -EIO; /* no NT SMB support fall into legacy open below */

	if (rc == -EIO) {
		/* old server, retry the open legacy style */
		rc = SMBLegacyOpen(xid, tcon, full_path, disposition,
			desiredAccess, create_options,
			fileHandle, oplock, buf, cifs_sb->local_nls,
			cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
	}
	if (rc) {
		cFYI(1, "cifs_create returned 0x%x", rc);
		goto out;
	}

	/* If Open reported that we actually created a file
	   then we now have to set the mode if possible */
	if ((tcon->unix_ext) && (*oplock & CIFS_CREATE_ACTION)) {
		struct cifs_unix_set_info_args args = {
				.mode	= mode,
				.ctime	= NO_CHANGE_64,
				.atime	= NO_CHANGE_64,
				.mtime	= NO_CHANGE_64,
				.device	= 0,
		};

		*created |= FILE_CREATED;
		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
			args.uid = (__u64) current_fsuid();
			if (inode->i_mode & S_ISGID)
				args.gid = (__u64) inode->i_gid;
			else
				args.gid = (__u64) current_fsgid();
		} else {
			args.uid = NO_CHANGE_64;
			args.gid = NO_CHANGE_64;
		}
		CIFSSMBUnixSetFileInfo(xid, tcon, &args, *fileHandle,
					current->tgid);
	} else {
		/* BB implement mode setting via Windows security
		   descriptors e.g. */
		/* CIFSSMBWinSetPerms(xid,tcon,path,mode,-1,-1,nls);*/

		/* Could set r/o dos attribute if mode & 0222 == 0 */
	}

cifs_create_get_file_info:
	/* server might mask mode so we have to query for it */
	if (tcon->unix_ext)
		rc = cifs_get_inode_info_unix(&newinode, full_path,
					      inode->i_sb, xid);
	else {
		rc = cifs_get_inode_info(&newinode, full_path, buf,
					 inode->i_sb, xid, fileHandle);
		if (newinode) {
			if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
				newinode->i_mode = mode;
			if ((*oplock & CIFS_CREATE_ACTION) &&
			    (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)) {
				newinode->i_uid = current_fsuid();
				if (inode->i_mode & S_ISGID)
					newinode->i_gid = inode->i_gid;
				else
					newinode->i_gid = current_fsgid();
			}
		}
	}

cifs_create_set_dentry:
	if (rc != 0) {
		cFYI(1, "Create worked, get_inode_info failed rc = %d", rc);
		goto out;
	}
	d_drop(direntry);
	d_add(direntry, newinode);

	/* ENOENT for create?  How weird... */
	rc = -ENOENT;
	if (!newinode) {
		CIFSSMBClose(xid, tcon, *fileHandle);
		goto out;
	}
	rc = 0;

out:
	kfree(buf);
	kfree(full_path);
	return rc;
}

int
cifs_atomic_open(struct inode *inode, struct dentry *direntry,
		 struct file *file, unsigned oflags, umode_t mode,
		 int *opened)
{
	int rc;
	int xid;
	struct tcon_link *tlink;
	struct cifs_tcon *tcon;
	__u16 fileHandle;
	__u32 oplock;
	struct file *filp;
	struct cifsFileInfo *pfile_info;

	/* Posix open is only called (at lookup time) for file create now.  For
	 * opens (rather than creates), because we do not know if it is a file
	 * or directory yet, and current Samba no longer allows us to do posix
	 * open on dirs, we could end up wasting an open call on what turns out
	 * to be a dir. For file opens, we wait to call posix open till
	 * cifs_open.  It could be added to atomic_open in the future but the
	 * performance tradeoff of the extra network request when EISDIR or
	 * EACCES is returned would have to be weighed against the 50% reduction
	 * in network traffic in the other paths.
	 */
	if (!(oflags & O_CREAT)) {
		struct dentry *res = cifs_lookup(inode, direntry, NULL);
		if (IS_ERR(res))
			return PTR_ERR(res);

		return finish_no_open(file, res);
	}

	rc = check_name(direntry);
	if (rc)
		return rc;

	xid = GetXid();

	cFYI(1, "parent inode = 0x%p name is: %s and dentry = 0x%p",
	     inode, direntry->d_name.name, direntry);

	tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb));
	filp = ERR_CAST(tlink);
	if (IS_ERR(tlink))
		goto free_xid;

	tcon = tlink_tcon(tlink);

	rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode,
			    &oplock, &fileHandle, opened);

	if (rc)
		goto out;

	rc = finish_open(file, direntry, generic_file_open, opened);
	if (rc) {
		CIFSSMBClose(xid, tcon, fileHandle);
		goto out;
	}

	pfile_info = cifs_new_fileinfo(fileHandle, filp, tlink, oplock);
	if (pfile_info == NULL) {
		CIFSSMBClose(xid, tcon, fileHandle);
		fput(filp);
		rc = -ENOMEM;
	}

out:
	cifs_put_tlink(tlink);
free_xid:
	FreeXid(xid);
	return rc;
}

int cifs_create(struct inode *inode, struct dentry *direntry, umode_t mode,
		struct nameidata *nd)
{
	int rc;
	int xid = GetXid();
	/*
	 * BB below access is probably too much for mknod to request
	 *    but we have to do query and setpathinfo so requesting
	 *    less could fail (unless we want to request getatr and setatr
	 *    permissions (only).  At least for POSIX we do not have to
	 *    request so much.
	 */
	unsigned oflags = O_EXCL | O_CREAT | O_RDWR;
	struct tcon_link *tlink;
	__u16 fileHandle;
	__u32 oplock;
	int created = FILE_CREATED;

	cFYI(1, "cifs_create parent inode = 0x%p name is: %s and dentry = 0x%p",
	     inode, direntry->d_name.name, direntry);

	tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb));
	rc = PTR_ERR(tlink);
	if (IS_ERR(tlink))
		goto free_xid;

	rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode,
			    &oplock, &fileHandle, &created);
	if (!rc)
		CIFSSMBClose(xid, tlink_tcon(tlink), fileHandle);

	cifs_put_tlink(tlink);
free_xid:
	FreeXid(xid);

	return rc;
}

int cifs_mknod(struct inode *inode, struct dentry *direntry, umode_t mode,
		dev_t device_number)
{
	int rc = -EPERM;
	int xid;
	int create_options = CREATE_NOT_DIR | CREATE_OPTION_SPECIAL;
	struct cifs_sb_info *cifs_sb;
	struct tcon_link *tlink;
	struct cifs_tcon *pTcon;
	struct cifs_io_parms io_parms;
	char *full_path = NULL;
	struct inode *newinode = NULL;
	int oplock = 0;
	u16 fileHandle;
	FILE_ALL_INFO *buf = NULL;
	unsigned int bytes_written;
	struct win_dev *pdev;

	if (!old_valid_dev(device_number))
		return -EINVAL;

	cifs_sb = CIFS_SB(inode->i_sb);
	tlink = cifs_sb_tlink(cifs_sb);
	if (IS_ERR(tlink))
		return PTR_ERR(tlink);

	pTcon = tlink_tcon(tlink);

	xid = GetXid();

	full_path = build_path_from_dentry(direntry);
	if (full_path == NULL) {
		rc = -ENOMEM;
		goto mknod_out;
	}

	if (pTcon->unix_ext) {
		struct cifs_unix_set_info_args args = {
			.mode	= mode & ~current_umask(),
			.ctime	= NO_CHANGE_64,
			.atime	= NO_CHANGE_64,
			.mtime	= NO_CHANGE_64,
			.device	= device_number,
		};
		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
			args.uid = (__u64) current_fsuid();
			args.gid = (__u64) current_fsgid();
		} else {
			args.uid = NO_CHANGE_64;
			args.gid = NO_CHANGE_64;
		}
		rc = CIFSSMBUnixSetPathInfo(xid, pTcon, full_path, &args,
					    cifs_sb->local_nls,
					    cifs_sb->mnt_cifs_flags &
						CIFS_MOUNT_MAP_SPECIAL_CHR);
		if (rc)
			goto mknod_out;

		rc = cifs_get_inode_info_unix(&newinode, full_path,
						inode->i_sb, xid);

		if (rc == 0)
			d_instantiate(direntry, newinode);
		goto mknod_out;
	}

	if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL))
		goto mknod_out;


	cFYI(1, "sfu compat create special file");

	buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
	if (buf == NULL) {
		kfree(full_path);
		rc = -ENOMEM;
		FreeXid(xid);
		return rc;
	}

	if (backup_cred(cifs_sb))
		create_options |= CREATE_OPEN_BACKUP_INTENT;

	rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_CREATE,
			 GENERIC_WRITE, create_options,
			 &fileHandle, &oplock, buf, cifs_sb->local_nls,
			 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
	if (rc)
		goto mknod_out;

	/* BB Do not bother to decode buf since no local inode yet to put
	 * timestamps in, but we can reuse it safely */

	pdev = (struct win_dev *)buf;
	io_parms.netfid = fileHandle;
	io_parms.pid = current->tgid;
	io_parms.tcon = pTcon;
	io_parms.offset = 0;
	io_parms.length = sizeof(struct win_dev);
	if (S_ISCHR(mode)) {
		memcpy(pdev->type, "IntxCHR", 8);
		pdev->major =
		      cpu_to_le64(MAJOR(device_number));
		pdev->minor =
		      cpu_to_le64(MINOR(device_number));
		rc = CIFSSMBWrite(xid, &io_parms,
			&bytes_written, (char *)pdev,
			NULL, 0);
	} else if (S_ISBLK(mode)) {
		memcpy(pdev->type, "IntxBLK", 8);
		pdev->major =
		      cpu_to_le64(MAJOR(device_number));
		pdev->minor =
		      cpu_to_le64(MINOR(device_number));
		rc = CIFSSMBWrite(xid, &io_parms,
			&bytes_written, (char *)pdev,
			NULL, 0);
	} /* else if (S_ISFIFO) */
	CIFSSMBClose(xid, pTcon, fileHandle);
	d_drop(direntry);

	/* FIXME: add code here to set EAs */

mknod_out:
	kfree(full_path);
	kfree(buf);
	FreeXid(xid);
	cifs_put_tlink(tlink);
	return rc;
}

struct dentry *
cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
	    struct nameidata *nd)
{
	int xid;
	int rc = 0; /* to get around spurious gcc warning, set to zero here */
	struct cifs_sb_info *cifs_sb;
	struct tcon_link *tlink;
	struct cifs_tcon *pTcon;
	struct inode *newInode = NULL;
	char *full_path = NULL;

	xid = GetXid();

	cFYI(1, "parent inode = 0x%p name is: %s and dentry = 0x%p",
	      parent_dir_inode, direntry->d_name.name, direntry);

	/* check whether path exists */

	cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
	tlink = cifs_sb_tlink(cifs_sb);
	if (IS_ERR(tlink)) {
		FreeXid(xid);
		return (struct dentry *)tlink;
	}
	pTcon = tlink_tcon(tlink);

	rc = check_name(direntry);
	if (rc)
		goto lookup_out;

	/* can not grab the rename sem here since it would
	deadlock in the cases (beginning of sys_rename itself)
	in which we already have the sb rename sem */
	full_path = build_path_from_dentry(direntry);
	if (full_path == NULL) {
		rc = -ENOMEM;
		goto lookup_out;
	}

	if (direntry->d_inode != NULL) {
		cFYI(1, "non-NULL inode in lookup");
	} else {
		cFYI(1, "NULL inode in lookup");
	}
	cFYI(1, "Full path: %s inode = 0x%p", full_path, direntry->d_inode);

	if (pTcon->unix_ext) {
		rc = cifs_get_inode_info_unix(&newInode, full_path,
					      parent_dir_inode->i_sb, xid);
	} else {
		rc = cifs_get_inode_info(&newInode, full_path, NULL,
				parent_dir_inode->i_sb, xid, NULL);
	}

	if ((rc == 0) && (newInode != NULL)) {
		d_add(direntry, newInode);
		/* since paths are not looked up by component - the parent
		   directories are presumed to be good here */
		renew_parental_timestamps(direntry);

	} else if (rc == -ENOENT) {
		rc = 0;
		direntry->d_time = jiffies;
		d_add(direntry, NULL);
	/*	if it was once a directory (but how can we tell?) we could do
		shrink_dcache_parent(direntry); */
	} else if (rc != -EACCES) {
		cERROR(1, "Unexpected lookup error %d", rc);
		/* We special case check for Access Denied - since that
		is a common return code */
	}

lookup_out:
	kfree(full_path);
	cifs_put_tlink(tlink);
	FreeXid(xid);
	return ERR_PTR(rc);
}

static int
cifs_d_revalidate(struct dentry *direntry, unsigned int flags)
{
	if (flags & LOOKUP_RCU)
		return -ECHILD;

	if (direntry->d_inode) {
		if (cifs_revalidate_dentry(direntry))
			return 0;
		else {
			/*
			 * If the inode wasn't known to be a dfs entry when
			 * the dentry was instantiated, such as when created
			 * via ->readdir(), it needs to be set now since the
			 * attributes will have been updated by
			 * cifs_revalidate_dentry().
			 */
			if (IS_AUTOMOUNT(direntry->d_inode) &&
			   !(direntry->d_flags & DCACHE_NEED_AUTOMOUNT)) {
				spin_lock(&direntry->d_lock);
				direntry->d_flags |= DCACHE_NEED_AUTOMOUNT;
				spin_unlock(&direntry->d_lock);
			}

			return 1;
		}
	}

	/*
	 * This may be nfsd (or something), anyway, we can't see the
	 * intent of this. So, since this can be for creation, drop it.
	 */
	if (!flags)
		return 0;

	/*
	 * Drop the negative dentry, in order to make sure to use the
	 * case sensitive name which is specified by user if this is
	 * for creation.
	 */
	if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
		return 0;

	if (time_after(jiffies, direntry->d_time + HZ) || !lookupCacheEnabled)
		return 0;

	return 1;
}

/* static int cifs_d_delete(struct dentry *direntry)
{
	int rc = 0;

	cFYI(1, "In cifs d_delete, name = %s", direntry->d_name.name);

	return rc;
}     */

const struct dentry_operations cifs_dentry_ops = {
	.d_revalidate = cifs_d_revalidate,
	.d_automount = cifs_dfs_d_automount,
/* d_delete:       cifs_d_delete,      */ /* not needed except for debugging */
};

static int cifs_ci_hash(const struct dentry *dentry, const struct inode *inode,
		struct qstr *q)
{
	struct nls_table *codepage = CIFS_SB(dentry->d_sb)->local_nls;
	unsigned long hash;
	int i;

	hash = init_name_hash();
	for (i = 0; i < q->len; i++)
		hash = partial_name_hash(nls_tolower(codepage, q->name[i]),
					 hash);
	q->hash = end_name_hash(hash);

	return 0;
}

static int cifs_ci_compare(const struct dentry *parent,
		const struct inode *pinode,
		const struct dentry *dentry, const struct inode *inode,
		unsigned int len, const char *str, const struct qstr *name)
{
	struct nls_table *codepage = CIFS_SB(pinode->i_sb)->local_nls;

	if ((name->len == len) &&
	    (nls_strnicmp(codepage, name->name, str, len) == 0))
		return 0;
	return 1;
}

const struct dentry_operations cifs_ci_dentry_ops = {
	.d_revalidate = cifs_d_revalidate,
	.d_hash = cifs_ci_hash,
	.d_compare = cifs_ci_compare,
	.d_automount = cifs_dfs_d_automount,
};
OpenPOWER on IntegriCloud