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23#include <linux/fs.h>
24#include <linux/stat.h>
25#include <linux/slab.h>
26#include <linux/namei.h>
27#include <linux/mount.h>
28#include <linux/file.h>
29#include "cifsfs.h"
30#include "cifspdu.h"
31#include "cifsglob.h"
32#include "cifsproto.h"
33#include "cifs_debug.h"
34#include "cifs_fs_sb.h"
35#include "cifs_unicode.h"
36
37static void
38renew_parental_timestamps(struct dentry *direntry)
39{
40
41
42 do {
43 cifs_set_time(direntry, jiffies);
44 direntry = direntry->d_parent;
45 } while (!IS_ROOT(direntry));
46}
47
48char *
49cifs_build_path_to_root(struct smb_vol *vol, struct cifs_sb_info *cifs_sb,
50 struct cifs_tcon *tcon)
51{
52 int pplen = vol->prepath ? strlen(vol->prepath) + 1 : 0;
53 int dfsplen;
54 char *full_path = NULL;
55
56
57 if (pplen == 0) {
58 full_path = kzalloc(1, GFP_KERNEL);
59 return full_path;
60 }
61
62 if (tcon->Flags & SMB_SHARE_IS_IN_DFS)
63 dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1);
64 else
65 dfsplen = 0;
66
67 full_path = kmalloc(dfsplen + pplen + 1, GFP_KERNEL);
68 if (full_path == NULL)
69 return full_path;
70
71 if (dfsplen)
72 strncpy(full_path, tcon->treeName, dfsplen);
73 full_path[dfsplen] = CIFS_DIR_SEP(cifs_sb);
74 strncpy(full_path + dfsplen + 1, vol->prepath, pplen);
75 convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
76 full_path[dfsplen + pplen] = 0;
77 return full_path;
78}
79
80
81char *
82build_path_from_dentry(struct dentry *direntry)
83{
84 struct dentry *temp;
85 int namelen;
86 int dfsplen;
87 int pplen = 0;
88 char *full_path;
89 char dirsep;
90 struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
91 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
92 unsigned seq;
93
94 dirsep = CIFS_DIR_SEP(cifs_sb);
95 if (tcon->Flags & SMB_SHARE_IS_IN_DFS)
96 dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1);
97 else
98 dfsplen = 0;
99
100 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
101 pplen = cifs_sb->prepath ? strlen(cifs_sb->prepath) + 1 : 0;
102
103cifs_bp_rename_retry:
104 namelen = dfsplen + pplen;
105 seq = read_seqbegin(&rename_lock);
106 rcu_read_lock();
107 for (temp = direntry; !IS_ROOT(temp);) {
108 namelen += (1 + temp->d_name.len);
109 temp = temp->d_parent;
110 if (temp == NULL) {
111 cifs_dbg(VFS, "corrupt dentry\n");
112 rcu_read_unlock();
113 return NULL;
114 }
115 }
116 rcu_read_unlock();
117
118 full_path = kmalloc(namelen+1, GFP_KERNEL);
119 if (full_path == NULL)
120 return full_path;
121 full_path[namelen] = 0;
122 rcu_read_lock();
123 for (temp = direntry; !IS_ROOT(temp);) {
124 spin_lock(&temp->d_lock);
125 namelen -= 1 + temp->d_name.len;
126 if (namelen < 0) {
127 spin_unlock(&temp->d_lock);
128 break;
129 } else {
130 full_path[namelen] = dirsep;
131 strncpy(full_path + namelen + 1, temp->d_name.name,
132 temp->d_name.len);
133 cifs_dbg(FYI, "name: %s\n", full_path + namelen);
134 }
135 spin_unlock(&temp->d_lock);
136 temp = temp->d_parent;
137 if (temp == NULL) {
138 cifs_dbg(VFS, "corrupt dentry\n");
139 rcu_read_unlock();
140 kfree(full_path);
141 return NULL;
142 }
143 }
144 rcu_read_unlock();
145 if (namelen != dfsplen + pplen || read_seqretry(&rename_lock, seq)) {
146 cifs_dbg(FYI, "did not end path lookup where expected. namelen=%ddfsplen=%d\n",
147 namelen, dfsplen);
148
149
150
151 kfree(full_path);
152 goto cifs_bp_rename_retry;
153 }
154
155
156
157
158
159
160
161 if (pplen) {
162 int i;
163
164 cifs_dbg(FYI, "using cifs_sb prepath <%s>\n", cifs_sb->prepath);
165 memcpy(full_path+dfsplen+1, cifs_sb->prepath, pplen-1);
166 full_path[dfsplen] = '\\';
167 for (i = 0; i < pplen-1; i++)
168 if (full_path[dfsplen+1+i] == '/')
169 full_path[dfsplen+1+i] = CIFS_DIR_SEP(cifs_sb);
170 }
171
172 if (dfsplen) {
173 strncpy(full_path, tcon->treeName, dfsplen);
174 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
175 int i;
176 for (i = 0; i < dfsplen; i++) {
177 if (full_path[i] == '\\')
178 full_path[i] = '/';
179 }
180 }
181 }
182 return full_path;
183}
184
185
186
187
188
189static int
190check_name(struct dentry *direntry)
191{
192 struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
193 int i;
194
195 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)) {
196 for (i = 0; i < direntry->d_name.len; i++) {
197 if (direntry->d_name.name[i] == '\\') {
198 cifs_dbg(FYI, "Invalid file name\n");
199 return -EINVAL;
200 }
201 }
202 }
203 return 0;
204}
205
206
207
208
209static int
210cifs_do_create(struct inode *inode, struct dentry *direntry, unsigned int xid,
211 struct tcon_link *tlink, unsigned oflags, umode_t mode,
212 __u32 *oplock, struct cifs_fid *fid)
213{
214 int rc = -ENOENT;
215 int create_options = CREATE_NOT_DIR;
216 int desired_access;
217 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
218 struct cifs_tcon *tcon = tlink_tcon(tlink);
219 char *full_path = NULL;
220 FILE_ALL_INFO *buf = NULL;
221 struct inode *newinode = NULL;
222 int disposition;
223 struct TCP_Server_Info *server = tcon->ses->server;
224 struct cifs_open_parms oparms;
225
226 *oplock = 0;
227 if (tcon->ses->server->oplocks)
228 *oplock = REQ_OPLOCK;
229
230 full_path = build_path_from_dentry(direntry);
231 if (full_path == NULL) {
232 rc = -ENOMEM;
233 goto out;
234 }
235
236 if (tcon->unix_ext && cap_unix(tcon->ses) && !tcon->broken_posix_open &&
237 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
238 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
239 rc = cifs_posix_open(full_path, &newinode, inode->i_sb, mode,
240 oflags, oplock, &fid->netfid, xid);
241 switch (rc) {
242 case 0:
243 if (newinode == NULL) {
244
245 goto cifs_create_get_file_info;
246 }
247
248 if (S_ISDIR(newinode->i_mode)) {
249 CIFSSMBClose(xid, tcon, fid->netfid);
250 iput(newinode);
251 rc = -EISDIR;
252 goto out;
253 }
254
255 if (!S_ISREG(newinode->i_mode)) {
256
257
258
259
260
261
262
263 CIFSSMBClose(xid, tcon, fid->netfid);
264 goto cifs_create_get_file_info;
265 }
266
267 goto cifs_create_set_dentry;
268
269 case -ENOENT:
270 goto cifs_create_get_file_info;
271
272 case -EIO:
273 case -EINVAL:
274
275
276
277
278
279
280
281
282 tcon->broken_posix_open = true;
283 break;
284
285 case -EREMOTE:
286 case -EOPNOTSUPP:
287
288
289
290
291
292 break;
293
294 default:
295 goto out;
296 }
297
298
299
300
301
302
303 }
304
305 desired_access = 0;
306 if (OPEN_FMODE(oflags) & FMODE_READ)
307 desired_access |= GENERIC_READ;
308 if (OPEN_FMODE(oflags) & FMODE_WRITE)
309 desired_access |= GENERIC_WRITE;
310
311 disposition = FILE_OVERWRITE_IF;
312 if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
313 disposition = FILE_CREATE;
314 else if ((oflags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
315 disposition = FILE_OVERWRITE_IF;
316 else if ((oflags & O_CREAT) == O_CREAT)
317 disposition = FILE_OPEN_IF;
318 else
319 cifs_dbg(FYI, "Create flag not set in create function\n");
320
321
322
323
324
325
326 if (!server->ops->open) {
327 rc = -ENOSYS;
328 goto out;
329 }
330
331 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
332 if (buf == NULL) {
333 rc = -ENOMEM;
334 goto out;
335 }
336
337
338
339
340
341 if (!tcon->unix_ext && (mode & S_IWUGO) == 0)
342 create_options |= CREATE_OPTION_READONLY;
343
344 if (backup_cred(cifs_sb))
345 create_options |= CREATE_OPEN_BACKUP_INTENT;
346
347 oparms.tcon = tcon;
348 oparms.cifs_sb = cifs_sb;
349 oparms.desired_access = desired_access;
350 oparms.create_options = create_options;
351 oparms.disposition = disposition;
352 oparms.path = full_path;
353 oparms.fid = fid;
354 oparms.reconnect = false;
355
356 rc = server->ops->open(xid, &oparms, oplock, buf);
357 if (rc) {
358 cifs_dbg(FYI, "cifs_create returned 0x%x\n", rc);
359 goto out;
360 }
361
362
363
364
365
366 if ((tcon->unix_ext) && (*oplock & CIFS_CREATE_ACTION)) {
367 struct cifs_unix_set_info_args args = {
368 .mode = mode,
369 .ctime = NO_CHANGE_64,
370 .atime = NO_CHANGE_64,
371 .mtime = NO_CHANGE_64,
372 .device = 0,
373 };
374
375 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
376 args.uid = current_fsuid();
377 if (inode->i_mode & S_ISGID)
378 args.gid = inode->i_gid;
379 else
380 args.gid = current_fsgid();
381 } else {
382 args.uid = INVALID_UID;
383 args.gid = INVALID_GID;
384 }
385 CIFSSMBUnixSetFileInfo(xid, tcon, &args, fid->netfid,
386 current->tgid);
387 } else {
388
389
390
391
392
393
394
395 }
396
397cifs_create_get_file_info:
398
399 if (tcon->unix_ext)
400 rc = cifs_get_inode_info_unix(&newinode, full_path, inode->i_sb,
401 xid);
402 else {
403 rc = cifs_get_inode_info(&newinode, full_path, buf, inode->i_sb,
404 xid, fid);
405 if (newinode) {
406 if (server->ops->set_lease_key)
407 server->ops->set_lease_key(newinode, fid);
408 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
409 newinode->i_mode = mode;
410 if ((*oplock & CIFS_CREATE_ACTION) &&
411 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)) {
412 newinode->i_uid = current_fsuid();
413 if (inode->i_mode & S_ISGID)
414 newinode->i_gid = inode->i_gid;
415 else
416 newinode->i_gid = current_fsgid();
417 }
418 }
419 }
420
421cifs_create_set_dentry:
422 if (rc != 0) {
423 cifs_dbg(FYI, "Create worked, get_inode_info failed rc = %d\n",
424 rc);
425 goto out_err;
426 }
427
428 if (S_ISDIR(newinode->i_mode)) {
429 rc = -EISDIR;
430 goto out_err;
431 }
432
433 d_drop(direntry);
434 d_add(direntry, newinode);
435
436out:
437 kfree(buf);
438 kfree(full_path);
439 return rc;
440
441out_err:
442 if (server->ops->close)
443 server->ops->close(xid, tcon, fid);
444 if (newinode)
445 iput(newinode);
446 goto out;
447}
448
449int
450cifs_atomic_open(struct inode *inode, struct dentry *direntry,
451 struct file *file, unsigned oflags, umode_t mode,
452 int *opened)
453{
454 int rc;
455 unsigned int xid;
456 struct tcon_link *tlink;
457 struct cifs_tcon *tcon;
458 struct TCP_Server_Info *server;
459 struct cifs_fid fid;
460 struct cifs_pending_open open;
461 __u32 oplock;
462 struct cifsFileInfo *file_info;
463
464
465
466
467
468
469
470
471
472
473
474
475 if (!(oflags & O_CREAT)) {
476 struct dentry *res;
477
478
479
480
481
482 if (!d_in_lookup(direntry))
483 return -ENOENT;
484
485 res = cifs_lookup(inode, direntry, 0);
486 if (IS_ERR(res))
487 return PTR_ERR(res);
488
489 return finish_no_open(file, res);
490 }
491
492 rc = check_name(direntry);
493 if (rc)
494 return rc;
495
496 xid = get_xid();
497
498 cifs_dbg(FYI, "parent inode = 0x%p name is: %pd and dentry = 0x%p\n",
499 inode, direntry, direntry);
500
501 tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb));
502 if (IS_ERR(tlink)) {
503 rc = PTR_ERR(tlink);
504 goto out_free_xid;
505 }
506
507 tcon = tlink_tcon(tlink);
508 server = tcon->ses->server;
509
510 if (server->ops->new_lease_key)
511 server->ops->new_lease_key(&fid);
512
513 cifs_add_pending_open(&fid, tlink, &open);
514
515 rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode,
516 &oplock, &fid);
517
518 if (rc) {
519 cifs_del_pending_open(&open);
520 goto out;
521 }
522
523 if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
524 *opened |= FILE_CREATED;
525
526 rc = finish_open(file, direntry, generic_file_open, opened);
527 if (rc) {
528 if (server->ops->close)
529 server->ops->close(xid, tcon, &fid);
530 cifs_del_pending_open(&open);
531 goto out;
532 }
533
534 if (file->f_flags & O_DIRECT &&
535 CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) {
536 if (CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
537 file->f_op = &cifs_file_direct_nobrl_ops;
538 else
539 file->f_op = &cifs_file_direct_ops;
540 }
541
542 file_info = cifs_new_fileinfo(&fid, file, tlink, oplock);
543 if (file_info == NULL) {
544 if (server->ops->close)
545 server->ops->close(xid, tcon, &fid);
546 cifs_del_pending_open(&open);
547 fput(file);
548 rc = -ENOMEM;
549 }
550
551out:
552 cifs_put_tlink(tlink);
553out_free_xid:
554 free_xid(xid);
555 return rc;
556}
557
558int cifs_create(struct inode *inode, struct dentry *direntry, umode_t mode,
559 bool excl)
560{
561 int rc;
562 unsigned int xid = get_xid();
563
564
565
566
567
568
569
570 unsigned oflags = O_EXCL | O_CREAT | O_RDWR;
571 struct tcon_link *tlink;
572 struct cifs_tcon *tcon;
573 struct TCP_Server_Info *server;
574 struct cifs_fid fid;
575 __u32 oplock;
576
577 cifs_dbg(FYI, "cifs_create parent inode = 0x%p name is: %pd and dentry = 0x%p\n",
578 inode, direntry, direntry);
579
580 tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb));
581 rc = PTR_ERR(tlink);
582 if (IS_ERR(tlink))
583 goto out_free_xid;
584
585 tcon = tlink_tcon(tlink);
586 server = tcon->ses->server;
587
588 if (server->ops->new_lease_key)
589 server->ops->new_lease_key(&fid);
590
591 rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode,
592 &oplock, &fid);
593 if (!rc && server->ops->close)
594 server->ops->close(xid, tcon, &fid);
595
596 cifs_put_tlink(tlink);
597out_free_xid:
598 free_xid(xid);
599 return rc;
600}
601
602int cifs_mknod(struct inode *inode, struct dentry *direntry, umode_t mode,
603 dev_t device_number)
604{
605 int rc = -EPERM;
606 unsigned int xid;
607 int create_options = CREATE_NOT_DIR | CREATE_OPTION_SPECIAL;
608 struct cifs_sb_info *cifs_sb;
609 struct tcon_link *tlink;
610 struct cifs_tcon *tcon;
611 struct cifs_io_parms io_parms;
612 char *full_path = NULL;
613 struct inode *newinode = NULL;
614 __u32 oplock = 0;
615 struct cifs_fid fid;
616 struct cifs_open_parms oparms;
617 FILE_ALL_INFO *buf = NULL;
618 unsigned int bytes_written;
619 struct win_dev *pdev;
620 struct kvec iov[2];
621
622 if (!old_valid_dev(device_number))
623 return -EINVAL;
624
625 cifs_sb = CIFS_SB(inode->i_sb);
626 tlink = cifs_sb_tlink(cifs_sb);
627 if (IS_ERR(tlink))
628 return PTR_ERR(tlink);
629
630 tcon = tlink_tcon(tlink);
631
632 xid = get_xid();
633
634 full_path = build_path_from_dentry(direntry);
635 if (full_path == NULL) {
636 rc = -ENOMEM;
637 goto mknod_out;
638 }
639
640 if (tcon->unix_ext) {
641 struct cifs_unix_set_info_args args = {
642 .mode = mode & ~current_umask(),
643 .ctime = NO_CHANGE_64,
644 .atime = NO_CHANGE_64,
645 .mtime = NO_CHANGE_64,
646 .device = device_number,
647 };
648 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
649 args.uid = current_fsuid();
650 args.gid = current_fsgid();
651 } else {
652 args.uid = INVALID_UID;
653 args.gid = INVALID_GID;
654 }
655 rc = CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args,
656 cifs_sb->local_nls,
657 cifs_remap(cifs_sb));
658 if (rc)
659 goto mknod_out;
660
661 rc = cifs_get_inode_info_unix(&newinode, full_path,
662 inode->i_sb, xid);
663
664 if (rc == 0)
665 d_instantiate(direntry, newinode);
666 goto mknod_out;
667 }
668
669 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL))
670 goto mknod_out;
671
672
673 cifs_dbg(FYI, "sfu compat create special file\n");
674
675 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
676 if (buf == NULL) {
677 kfree(full_path);
678 rc = -ENOMEM;
679 free_xid(xid);
680 return rc;
681 }
682
683 if (backup_cred(cifs_sb))
684 create_options |= CREATE_OPEN_BACKUP_INTENT;
685
686 oparms.tcon = tcon;
687 oparms.cifs_sb = cifs_sb;
688 oparms.desired_access = GENERIC_WRITE;
689 oparms.create_options = create_options;
690 oparms.disposition = FILE_CREATE;
691 oparms.path = full_path;
692 oparms.fid = &fid;
693 oparms.reconnect = false;
694
695 if (tcon->ses->server->oplocks)
696 oplock = REQ_OPLOCK;
697 else
698 oplock = 0;
699 rc = tcon->ses->server->ops->open(xid, &oparms, &oplock, buf);
700 if (rc)
701 goto mknod_out;
702
703
704
705
706
707
708 pdev = (struct win_dev *)buf;
709 io_parms.pid = current->tgid;
710 io_parms.tcon = tcon;
711 io_parms.offset = 0;
712 io_parms.length = sizeof(struct win_dev);
713 iov[1].iov_base = buf;
714 iov[1].iov_len = sizeof(struct win_dev);
715 if (S_ISCHR(mode)) {
716 memcpy(pdev->type, "IntxCHR", 8);
717 pdev->major = cpu_to_le64(MAJOR(device_number));
718 pdev->minor = cpu_to_le64(MINOR(device_number));
719 rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms,
720 &bytes_written, iov, 1);
721 } else if (S_ISBLK(mode)) {
722 memcpy(pdev->type, "IntxBLK", 8);
723 pdev->major = cpu_to_le64(MAJOR(device_number));
724 pdev->minor = cpu_to_le64(MINOR(device_number));
725 rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms,
726 &bytes_written, iov, 1);
727 }
728 tcon->ses->server->ops->close(xid, tcon, &fid);
729 d_drop(direntry);
730
731
732
733mknod_out:
734 kfree(full_path);
735 kfree(buf);
736 free_xid(xid);
737 cifs_put_tlink(tlink);
738 return rc;
739}
740
741struct dentry *
742cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
743 unsigned int flags)
744{
745 unsigned int xid;
746 int rc = 0;
747 struct cifs_sb_info *cifs_sb;
748 struct tcon_link *tlink;
749 struct cifs_tcon *pTcon;
750 struct inode *newInode = NULL;
751 char *full_path = NULL;
752
753 xid = get_xid();
754
755 cifs_dbg(FYI, "parent inode = 0x%p name is: %pd and dentry = 0x%p\n",
756 parent_dir_inode, direntry, direntry);
757
758
759
760 cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
761 tlink = cifs_sb_tlink(cifs_sb);
762 if (IS_ERR(tlink)) {
763 free_xid(xid);
764 return (struct dentry *)tlink;
765 }
766 pTcon = tlink_tcon(tlink);
767
768 rc = check_name(direntry);
769 if (rc)
770 goto lookup_out;
771
772
773
774
775 full_path = build_path_from_dentry(direntry);
776 if (full_path == NULL) {
777 rc = -ENOMEM;
778 goto lookup_out;
779 }
780
781 if (d_really_is_positive(direntry)) {
782 cifs_dbg(FYI, "non-NULL inode in lookup\n");
783 } else {
784 cifs_dbg(FYI, "NULL inode in lookup\n");
785 }
786 cifs_dbg(FYI, "Full path: %s inode = 0x%p\n",
787 full_path, d_inode(direntry));
788
789 if (pTcon->unix_ext) {
790 rc = cifs_get_inode_info_unix(&newInode, full_path,
791 parent_dir_inode->i_sb, xid);
792 } else {
793 rc = cifs_get_inode_info(&newInode, full_path, NULL,
794 parent_dir_inode->i_sb, xid, NULL);
795 }
796
797 if ((rc == 0) && (newInode != NULL)) {
798 d_add(direntry, newInode);
799
800
801 renew_parental_timestamps(direntry);
802
803 } else if (rc == -ENOENT) {
804 rc = 0;
805 cifs_set_time(direntry, jiffies);
806 d_add(direntry, NULL);
807
808
809 } else if (rc != -EACCES) {
810 cifs_dbg(FYI, "Unexpected lookup error %d\n", rc);
811
812
813 }
814
815lookup_out:
816 kfree(full_path);
817 cifs_put_tlink(tlink);
818 free_xid(xid);
819 return ERR_PTR(rc);
820}
821
822static int
823cifs_d_revalidate(struct dentry *direntry, unsigned int flags)
824{
825 if (flags & LOOKUP_RCU)
826 return -ECHILD;
827
828 if (d_really_is_positive(direntry)) {
829 if (cifs_revalidate_dentry(direntry))
830 return 0;
831 else {
832
833
834
835
836
837
838
839 if (IS_AUTOMOUNT(d_inode(direntry)) &&
840 !(direntry->d_flags & DCACHE_NEED_AUTOMOUNT)) {
841 spin_lock(&direntry->d_lock);
842 direntry->d_flags |= DCACHE_NEED_AUTOMOUNT;
843 spin_unlock(&direntry->d_lock);
844 }
845
846 return 1;
847 }
848 }
849
850
851
852
853
854 if (!flags)
855 return 0;
856
857
858
859
860
861
862 if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
863 return 0;
864
865 if (time_after(jiffies, cifs_get_time(direntry) + HZ) || !lookupCacheEnabled)
866 return 0;
867
868 return 1;
869}
870
871
872
873
874
875
876
877
878
879
880const struct dentry_operations cifs_dentry_ops = {
881 .d_revalidate = cifs_d_revalidate,
882 .d_automount = cifs_dfs_d_automount,
883
884};
885
886static int cifs_ci_hash(const struct dentry *dentry, struct qstr *q)
887{
888 struct nls_table *codepage = CIFS_SB(dentry->d_sb)->local_nls;
889 unsigned long hash;
890 wchar_t c;
891 int i, charlen;
892
893 hash = init_name_hash(dentry);
894 for (i = 0; i < q->len; i += charlen) {
895 charlen = codepage->char2uni(&q->name[i], q->len - i, &c);
896
897 if (unlikely(charlen < 0))
898 return charlen;
899 hash = partial_name_hash(cifs_toupper(c), hash);
900 }
901 q->hash = end_name_hash(hash);
902
903 return 0;
904}
905
906static int cifs_ci_compare(const struct dentry *dentry,
907 unsigned int len, const char *str, const struct qstr *name)
908{
909 struct nls_table *codepage = CIFS_SB(dentry->d_sb)->local_nls;
910 wchar_t c1, c2;
911 int i, l1, l2;
912
913
914
915
916
917
918
919 if (name->len != len)
920 return 1;
921
922 for (i = 0; i < len; i += l1) {
923
924 l1 = codepage->char2uni(&str[i], len - i, &c1);
925 l2 = codepage->char2uni(&name->name[i], name->len - i, &c2);
926
927
928
929
930
931 if (unlikely(l1 < 0 && l2 < 0)) {
932 if (str[i] != name->name[i])
933 return 1;
934 l1 = 1;
935 continue;
936 }
937
938
939
940
941
942 if (l1 != l2)
943 return 1;
944
945
946 if (cifs_toupper(c1) != cifs_toupper(c2))
947 return 1;
948 }
949
950 return 0;
951}
952
953const struct dentry_operations cifs_ci_dentry_ops = {
954 .d_revalidate = cifs_d_revalidate,
955 .d_hash = cifs_ci_hash,
956 .d_compare = cifs_ci_compare,
957 .d_automount = cifs_dfs_d_automount,
958};
959