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1/*
2 * fs/cifs/dir.c
3 *
4 * vfs operations that deal with dentries
5 *
6 * Copyright (C) International Business Machines Corp., 2002,2009
7 * Author(s): Steve French (sfrench@us.ibm.com)
8 *
9 * This library is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU Lesser General Public License as published
11 * by the Free Software Foundation; either version 2.1 of the License, or
12 * (at your option) any later version.
13 *
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
17 * the GNU Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public License
20 * along with this library; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 */
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
36static void
37renew_parental_timestamps(struct dentry *direntry)
38{
39 /* BB check if there is a way to get the kernel to do this or if we
40 really need this */
41 do {
42 direntry->d_time = jiffies;
43 direntry = direntry->d_parent;
44 } while (!IS_ROOT(direntry));
45}
46
47/* Note: caller must free return buffer */
48char *
49build_path_from_dentry(struct dentry *direntry)
50{
51 struct dentry *temp;
52 int namelen;
53 int dfsplen;
54 char *full_path;
55 char dirsep;
56 struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
57 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
58 unsigned seq;
59
60 dirsep = CIFS_DIR_SEP(cifs_sb);
61 if (tcon->Flags & SMB_SHARE_IS_IN_DFS)
62 dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1);
63 else
64 dfsplen = 0;
65cifs_bp_rename_retry:
66 namelen = dfsplen;
67 seq = read_seqbegin(&rename_lock);
68 rcu_read_lock();
69 for (temp = direntry; !IS_ROOT(temp);) {
70 namelen += (1 + temp->d_name.len);
71 temp = temp->d_parent;
72 if (temp == NULL) {
73 cERROR(1, "corrupt dentry");
74 rcu_read_unlock();
75 return NULL;
76 }
77 }
78 rcu_read_unlock();
79
80 full_path = kmalloc(namelen+1, GFP_KERNEL);
81 if (full_path == NULL)
82 return full_path;
83 full_path[namelen] = 0; /* trailing null */
84 rcu_read_lock();
85 for (temp = direntry; !IS_ROOT(temp);) {
86 spin_lock(&temp->d_lock);
87 namelen -= 1 + temp->d_name.len;
88 if (namelen < 0) {
89 spin_unlock(&temp->d_lock);
90 break;
91 } else {
92 full_path[namelen] = dirsep;
93 strncpy(full_path + namelen + 1, temp->d_name.name,
94 temp->d_name.len);
95 cFYI(0, "name: %s", full_path + namelen);
96 }
97 spin_unlock(&temp->d_lock);
98 temp = temp->d_parent;
99 if (temp == NULL) {
100 cERROR(1, "corrupt dentry");
101 rcu_read_unlock();
102 kfree(full_path);
103 return NULL;
104 }
105 }
106 rcu_read_unlock();
107 if (namelen != dfsplen || read_seqretry(&rename_lock, seq)) {
108 cFYI(1, "did not end path lookup where expected. namelen=%d "
109 "dfsplen=%d", namelen, dfsplen);
110 /* presumably this is only possible if racing with a rename
111 of one of the parent directories (we can not lock the dentries
112 above us to prevent this, but retrying should be harmless) */
113 kfree(full_path);
114 goto cifs_bp_rename_retry;
115 }
116 /* DIR_SEP already set for byte 0 / vs \ but not for
117 subsequent slashes in prepath which currently must
118 be entered the right way - not sure if there is an alternative
119 since the '\' is a valid posix character so we can not switch
120 those safely to '/' if any are found in the middle of the prepath */
121 /* BB test paths to Windows with '/' in the midst of prepath */
122
123 if (dfsplen) {
124 strncpy(full_path, tcon->treeName, dfsplen);
125 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
126 int i;
127 for (i = 0; i < dfsplen; i++) {
128 if (full_path[i] == '\\')
129 full_path[i] = '/';
130 }
131 }
132 }
133 return full_path;
134}
135
136/* Inode operations in similar order to how they appear in Linux file fs.h */
137
138int
139cifs_create(struct inode *inode, struct dentry *direntry, umode_t mode,
140 struct nameidata *nd)
141{
142 int rc = -ENOENT;
143 int xid;
144 int create_options = CREATE_NOT_DIR;
145 __u32 oplock = 0;
146 int oflags;
147 /*
148 * BB below access is probably too much for mknod to request
149 * but we have to do query and setpathinfo so requesting
150 * less could fail (unless we want to request getatr and setatr
151 * permissions (only). At least for POSIX we do not have to
152 * request so much.
153 */
154 int desiredAccess = GENERIC_READ | GENERIC_WRITE;
155 __u16 fileHandle;
156 struct cifs_sb_info *cifs_sb;
157 struct tcon_link *tlink;
158 struct cifs_tcon *tcon;
159 char *full_path = NULL;
160 FILE_ALL_INFO *buf = NULL;
161 struct inode *newinode = NULL;
162 int disposition = FILE_OVERWRITE_IF;
163
164 xid = GetXid();
165
166 cifs_sb = CIFS_SB(inode->i_sb);
167 tlink = cifs_sb_tlink(cifs_sb);
168 if (IS_ERR(tlink)) {
169 FreeXid(xid);
170 return PTR_ERR(tlink);
171 }
172 tcon = tlink_tcon(tlink);
173
174 if (tcon->ses->server->oplocks)
175 oplock = REQ_OPLOCK;
176
177 if (nd)
178 oflags = nd->intent.open.file->f_flags;
179 else
180 oflags = O_RDONLY | O_CREAT;
181
182 full_path = build_path_from_dentry(direntry);
183 if (full_path == NULL) {
184 rc = -ENOMEM;
185 goto cifs_create_out;
186 }
187
188 if (tcon->unix_ext && (tcon->ses->capabilities & CAP_UNIX) &&
189 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
190 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
191 rc = cifs_posix_open(full_path, &newinode,
192 inode->i_sb, mode, oflags, &oplock, &fileHandle, xid);
193 /* EIO could indicate that (posix open) operation is not
194 supported, despite what server claimed in capability
195 negotiation. EREMOTE indicates DFS junction, which is not
196 handled in posix open */
197
198 if (rc == 0) {
199 if (newinode == NULL) /* query inode info */
200 goto cifs_create_get_file_info;
201 else /* success, no need to query */
202 goto cifs_create_set_dentry;
203 } else if ((rc != -EIO) && (rc != -EREMOTE) &&
204 (rc != -EOPNOTSUPP) && (rc != -EINVAL))
205 goto cifs_create_out;
206 /* else fallthrough to retry, using older open call, this is
207 case where server does not support this SMB level, and
208 falsely claims capability (also get here for DFS case
209 which should be rare for path not covered on files) */
210 }
211
212 if (nd) {
213 /* if the file is going to stay open, then we
214 need to set the desired access properly */
215 desiredAccess = 0;
216 if (OPEN_FMODE(oflags) & FMODE_READ)
217 desiredAccess |= GENERIC_READ; /* is this too little? */
218 if (OPEN_FMODE(oflags) & FMODE_WRITE)
219 desiredAccess |= GENERIC_WRITE;
220
221 if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
222 disposition = FILE_CREATE;
223 else if ((oflags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
224 disposition = FILE_OVERWRITE_IF;
225 else if ((oflags & O_CREAT) == O_CREAT)
226 disposition = FILE_OPEN_IF;
227 else
228 cFYI(1, "Create flag not set in create function");
229 }
230
231 /* BB add processing to set equivalent of mode - e.g. via CreateX with
232 ACLs */
233
234 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
235 if (buf == NULL) {
236 rc = -ENOMEM;
237 goto cifs_create_out;
238 }
239
240 /*
241 * if we're not using unix extensions, see if we need to set
242 * ATTR_READONLY on the create call
243 */
244 if (!tcon->unix_ext && (mode & S_IWUGO) == 0)
245 create_options |= CREATE_OPTION_READONLY;
246
247 if (backup_cred(cifs_sb))
248 create_options |= CREATE_OPEN_BACKUP_INTENT;
249
250 if (tcon->ses->capabilities & CAP_NT_SMBS)
251 rc = CIFSSMBOpen(xid, tcon, full_path, disposition,
252 desiredAccess, create_options,
253 &fileHandle, &oplock, buf, cifs_sb->local_nls,
254 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
255 else
256 rc = -EIO; /* no NT SMB support fall into legacy open below */
257
258 if (rc == -EIO) {
259 /* old server, retry the open legacy style */
260 rc = SMBLegacyOpen(xid, tcon, full_path, disposition,
261 desiredAccess, create_options,
262 &fileHandle, &oplock, buf, cifs_sb->local_nls,
263 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
264 }
265 if (rc) {
266 cFYI(1, "cifs_create returned 0x%x", rc);
267 goto cifs_create_out;
268 }
269
270 /* If Open reported that we actually created a file
271 then we now have to set the mode if possible */
272 if ((tcon->unix_ext) && (oplock & CIFS_CREATE_ACTION)) {
273 struct cifs_unix_set_info_args args = {
274 .mode = mode,
275 .ctime = NO_CHANGE_64,
276 .atime = NO_CHANGE_64,
277 .mtime = NO_CHANGE_64,
278 .device = 0,
279 };
280
281 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
282 args.uid = (__u64) current_fsuid();
283 if (inode->i_mode & S_ISGID)
284 args.gid = (__u64) inode->i_gid;
285 else
286 args.gid = (__u64) current_fsgid();
287 } else {
288 args.uid = NO_CHANGE_64;
289 args.gid = NO_CHANGE_64;
290 }
291 CIFSSMBUnixSetFileInfo(xid, tcon, &args, fileHandle,
292 current->tgid);
293 } else {
294 /* BB implement mode setting via Windows security
295 descriptors e.g. */
296 /* CIFSSMBWinSetPerms(xid,tcon,path,mode,-1,-1,nls);*/
297
298 /* Could set r/o dos attribute if mode & 0222 == 0 */
299 }
300
301cifs_create_get_file_info:
302 /* server might mask mode so we have to query for it */
303 if (tcon->unix_ext)
304 rc = cifs_get_inode_info_unix(&newinode, full_path,
305 inode->i_sb, xid);
306 else {
307 rc = cifs_get_inode_info(&newinode, full_path, buf,
308 inode->i_sb, xid, &fileHandle);
309 if (newinode) {
310 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
311 newinode->i_mode = mode;
312 if ((oplock & CIFS_CREATE_ACTION) &&
313 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)) {
314 newinode->i_uid = current_fsuid();
315 if (inode->i_mode & S_ISGID)
316 newinode->i_gid = inode->i_gid;
317 else
318 newinode->i_gid = current_fsgid();
319 }
320 }
321 }
322
323cifs_create_set_dentry:
324 if (rc == 0)
325 d_instantiate(direntry, newinode);
326 else
327 cFYI(1, "Create worked, get_inode_info failed rc = %d", rc);
328
329 if (newinode && nd) {
330 struct cifsFileInfo *pfile_info;
331 struct file *filp;
332
333 filp = lookup_instantiate_filp(nd, direntry, generic_file_open);
334 if (IS_ERR(filp)) {
335 rc = PTR_ERR(filp);
336 CIFSSMBClose(xid, tcon, fileHandle);
337 goto cifs_create_out;
338 }
339
340 pfile_info = cifs_new_fileinfo(fileHandle, filp, tlink, oplock);
341 if (pfile_info == NULL) {
342 fput(filp);
343 CIFSSMBClose(xid, tcon, fileHandle);
344 rc = -ENOMEM;
345 }
346 } else {
347 CIFSSMBClose(xid, tcon, fileHandle);
348 }
349
350cifs_create_out:
351 kfree(buf);
352 kfree(full_path);
353 cifs_put_tlink(tlink);
354 FreeXid(xid);
355 return rc;
356}
357
358int cifs_mknod(struct inode *inode, struct dentry *direntry, umode_t mode,
359 dev_t device_number)
360{
361 int rc = -EPERM;
362 int xid;
363 int create_options = CREATE_NOT_DIR | CREATE_OPTION_SPECIAL;
364 struct cifs_sb_info *cifs_sb;
365 struct tcon_link *tlink;
366 struct cifs_tcon *pTcon;
367 struct cifs_io_parms io_parms;
368 char *full_path = NULL;
369 struct inode *newinode = NULL;
370 int oplock = 0;
371 u16 fileHandle;
372 FILE_ALL_INFO *buf = NULL;
373 unsigned int bytes_written;
374 struct win_dev *pdev;
375
376 if (!old_valid_dev(device_number))
377 return -EINVAL;
378
379 cifs_sb = CIFS_SB(inode->i_sb);
380 tlink = cifs_sb_tlink(cifs_sb);
381 if (IS_ERR(tlink))
382 return PTR_ERR(tlink);
383
384 pTcon = tlink_tcon(tlink);
385
386 xid = GetXid();
387
388 full_path = build_path_from_dentry(direntry);
389 if (full_path == NULL) {
390 rc = -ENOMEM;
391 goto mknod_out;
392 }
393
394 if (pTcon->unix_ext) {
395 struct cifs_unix_set_info_args args = {
396 .mode = mode & ~current_umask(),
397 .ctime = NO_CHANGE_64,
398 .atime = NO_CHANGE_64,
399 .mtime = NO_CHANGE_64,
400 .device = device_number,
401 };
402 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
403 args.uid = (__u64) current_fsuid();
404 args.gid = (__u64) current_fsgid();
405 } else {
406 args.uid = NO_CHANGE_64;
407 args.gid = NO_CHANGE_64;
408 }
409 rc = CIFSSMBUnixSetPathInfo(xid, pTcon, full_path, &args,
410 cifs_sb->local_nls,
411 cifs_sb->mnt_cifs_flags &
412 CIFS_MOUNT_MAP_SPECIAL_CHR);
413 if (rc)
414 goto mknod_out;
415
416 rc = cifs_get_inode_info_unix(&newinode, full_path,
417 inode->i_sb, xid);
418
419 if (rc == 0)
420 d_instantiate(direntry, newinode);
421 goto mknod_out;
422 }
423
424 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL))
425 goto mknod_out;
426
427
428 cFYI(1, "sfu compat create special file");
429
430 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
431 if (buf == NULL) {
432 kfree(full_path);
433 rc = -ENOMEM;
434 FreeXid(xid);
435 return rc;
436 }
437
438 if (backup_cred(cifs_sb))
439 create_options |= CREATE_OPEN_BACKUP_INTENT;
440
441 rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_CREATE,
442 GENERIC_WRITE, create_options,
443 &fileHandle, &oplock, buf, cifs_sb->local_nls,
444 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
445 if (rc)
446 goto mknod_out;
447
448 /* BB Do not bother to decode buf since no local inode yet to put
449 * timestamps in, but we can reuse it safely */
450
451 pdev = (struct win_dev *)buf;
452 io_parms.netfid = fileHandle;
453 io_parms.pid = current->tgid;
454 io_parms.tcon = pTcon;
455 io_parms.offset = 0;
456 io_parms.length = sizeof(struct win_dev);
457 if (S_ISCHR(mode)) {
458 memcpy(pdev->type, "IntxCHR", 8);
459 pdev->major =
460 cpu_to_le64(MAJOR(device_number));
461 pdev->minor =
462 cpu_to_le64(MINOR(device_number));
463 rc = CIFSSMBWrite(xid, &io_parms,
464 &bytes_written, (char *)pdev,
465 NULL, 0);
466 } else if (S_ISBLK(mode)) {
467 memcpy(pdev->type, "IntxBLK", 8);
468 pdev->major =
469 cpu_to_le64(MAJOR(device_number));
470 pdev->minor =
471 cpu_to_le64(MINOR(device_number));
472 rc = CIFSSMBWrite(xid, &io_parms,
473 &bytes_written, (char *)pdev,
474 NULL, 0);
475 } /* else if (S_ISFIFO) */
476 CIFSSMBClose(xid, pTcon, fileHandle);
477 d_drop(direntry);
478
479 /* FIXME: add code here to set EAs */
480
481mknod_out:
482 kfree(full_path);
483 kfree(buf);
484 FreeXid(xid);
485 cifs_put_tlink(tlink);
486 return rc;
487}
488
489struct dentry *
490cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
491 struct nameidata *nd)
492{
493 int xid;
494 int rc = 0; /* to get around spurious gcc warning, set to zero here */
495 __u32 oplock;
496 __u16 fileHandle = 0;
497 bool posix_open = false;
498 struct cifs_sb_info *cifs_sb;
499 struct tcon_link *tlink;
500 struct cifs_tcon *pTcon;
501 struct cifsFileInfo *cfile;
502 struct inode *newInode = NULL;
503 char *full_path = NULL;
504 struct file *filp;
505
506 xid = GetXid();
507
508 cFYI(1, "parent inode = 0x%p name is: %s and dentry = 0x%p",
509 parent_dir_inode, direntry->d_name.name, direntry);
510
511 /* check whether path exists */
512
513 cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
514 tlink = cifs_sb_tlink(cifs_sb);
515 if (IS_ERR(tlink)) {
516 FreeXid(xid);
517 return (struct dentry *)tlink;
518 }
519 pTcon = tlink_tcon(tlink);
520
521 oplock = pTcon->ses->server->oplocks ? REQ_OPLOCK : 0;
522
523 /*
524 * Don't allow the separator character in a path component.
525 * The VFS will not allow "/", but "\" is allowed by posix.
526 */
527 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)) {
528 int i;
529 for (i = 0; i < direntry->d_name.len; i++)
530 if (direntry->d_name.name[i] == '\\') {
531 cFYI(1, "Invalid file name");
532 rc = -EINVAL;
533 goto lookup_out;
534 }
535 }
536
537 /*
538 * O_EXCL: optimize away the lookup, but don't hash the dentry. Let
539 * the VFS handle the create.
540 */
541 if (nd && (nd->flags & LOOKUP_EXCL)) {
542 d_instantiate(direntry, NULL);
543 rc = 0;
544 goto lookup_out;
545 }
546
547 /* can not grab the rename sem here since it would
548 deadlock in the cases (beginning of sys_rename itself)
549 in which we already have the sb rename sem */
550 full_path = build_path_from_dentry(direntry);
551 if (full_path == NULL) {
552 rc = -ENOMEM;
553 goto lookup_out;
554 }
555
556 if (direntry->d_inode != NULL) {
557 cFYI(1, "non-NULL inode in lookup");
558 } else {
559 cFYI(1, "NULL inode in lookup");
560 }
561 cFYI(1, "Full path: %s inode = 0x%p", full_path, direntry->d_inode);
562
563 /* Posix open is only called (at lookup time) for file create now.
564 * For opens (rather than creates), because we do not know if it
565 * is a file or directory yet, and current Samba no longer allows
566 * us to do posix open on dirs, we could end up wasting an open call
567 * on what turns out to be a dir. For file opens, we wait to call posix
568 * open till cifs_open. It could be added here (lookup) in the future
569 * but the performance tradeoff of the extra network request when EISDIR
570 * or EACCES is returned would have to be weighed against the 50%
571 * reduction in network traffic in the other paths.
572 */
573 if (pTcon->unix_ext) {
574 if (nd && !(nd->flags & LOOKUP_DIRECTORY) &&
575 (nd->flags & LOOKUP_OPEN) && !pTcon->broken_posix_open &&
576 (nd->intent.open.file->f_flags & O_CREAT)) {
577 rc = cifs_posix_open(full_path, &newInode,
578 parent_dir_inode->i_sb,
579 nd->intent.open.create_mode,
580 nd->intent.open.file->f_flags, &oplock,
581 &fileHandle, xid);
582 /*
583 * The check below works around a bug in POSIX
584 * open in samba versions 3.3.1 and earlier where
585 * open could incorrectly fail with invalid parameter.
586 * If either that or op not supported returned, follow
587 * the normal lookup.
588 */
589 switch (rc) {
590 case 0:
591 /*
592 * The server may allow us to open things like
593 * FIFOs, but the client isn't set up to deal
594 * with that. If it's not a regular file, just
595 * close it and proceed as if it were a normal
596 * lookup.
597 */
598 if (newInode && !S_ISREG(newInode->i_mode)) {
599 CIFSSMBClose(xid, pTcon, fileHandle);
600 break;
601 }
602 case -ENOENT:
603 posix_open = true;
604 case -EOPNOTSUPP:
605 break;
606 default:
607 pTcon->broken_posix_open = true;
608 }
609 }
610 if (!posix_open)
611 rc = cifs_get_inode_info_unix(&newInode, full_path,
612 parent_dir_inode->i_sb, xid);
613 } else
614 rc = cifs_get_inode_info(&newInode, full_path, NULL,
615 parent_dir_inode->i_sb, xid, NULL);
616
617 if ((rc == 0) && (newInode != NULL)) {
618 d_add(direntry, newInode);
619 if (posix_open) {
620 filp = lookup_instantiate_filp(nd, direntry,
621 generic_file_open);
622 if (IS_ERR(filp)) {
623 rc = PTR_ERR(filp);
624 CIFSSMBClose(xid, pTcon, fileHandle);
625 goto lookup_out;
626 }
627
628 cfile = cifs_new_fileinfo(fileHandle, filp, tlink,
629 oplock);
630 if (cfile == NULL) {
631 fput(filp);
632 CIFSSMBClose(xid, pTcon, fileHandle);
633 rc = -ENOMEM;
634 goto lookup_out;
635 }
636 }
637 /* since paths are not looked up by component - the parent
638 directories are presumed to be good here */
639 renew_parental_timestamps(direntry);
640
641 } else if (rc == -ENOENT) {
642 rc = 0;
643 direntry->d_time = jiffies;
644 d_add(direntry, NULL);
645 /* if it was once a directory (but how can we tell?) we could do
646 shrink_dcache_parent(direntry); */
647 } else if (rc != -EACCES) {
648 cERROR(1, "Unexpected lookup error %d", rc);
649 /* We special case check for Access Denied - since that
650 is a common return code */
651 }
652
653lookup_out:
654 kfree(full_path);
655 cifs_put_tlink(tlink);
656 FreeXid(xid);
657 return ERR_PTR(rc);
658}
659
660static int
661cifs_d_revalidate(struct dentry *direntry, struct nameidata *nd)
662{
663 if (nd && (nd->flags & LOOKUP_RCU))
664 return -ECHILD;
665
666 if (direntry->d_inode) {
667 if (cifs_revalidate_dentry(direntry))
668 return 0;
669 else {
670 /*
671 * If the inode wasn't known to be a dfs entry when
672 * the dentry was instantiated, such as when created
673 * via ->readdir(), it needs to be set now since the
674 * attributes will have been updated by
675 * cifs_revalidate_dentry().
676 */
677 if (IS_AUTOMOUNT(direntry->d_inode) &&
678 !(direntry->d_flags & DCACHE_NEED_AUTOMOUNT)) {
679 spin_lock(&direntry->d_lock);
680 direntry->d_flags |= DCACHE_NEED_AUTOMOUNT;
681 spin_unlock(&direntry->d_lock);
682 }
683
684 return 1;
685 }
686 }
687
688 /*
689 * This may be nfsd (or something), anyway, we can't see the
690 * intent of this. So, since this can be for creation, drop it.
691 */
692 if (!nd)
693 return 0;
694
695 /*
696 * Drop the negative dentry, in order to make sure to use the
697 * case sensitive name which is specified by user if this is
698 * for creation.
699 */
700 if (nd->flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
701 return 0;
702
703 if (time_after(jiffies, direntry->d_time + HZ) || !lookupCacheEnabled)
704 return 0;
705
706 return 1;
707}
708
709/* static int cifs_d_delete(struct dentry *direntry)
710{
711 int rc = 0;
712
713 cFYI(1, "In cifs d_delete, name = %s", direntry->d_name.name);
714
715 return rc;
716} */
717
718const struct dentry_operations cifs_dentry_ops = {
719 .d_revalidate = cifs_d_revalidate,
720 .d_automount = cifs_dfs_d_automount,
721/* d_delete: cifs_d_delete, */ /* not needed except for debugging */
722};
723
724static int cifs_ci_hash(const struct dentry *dentry, const struct inode *inode,
725 struct qstr *q)
726{
727 struct nls_table *codepage = CIFS_SB(dentry->d_sb)->local_nls;
728 unsigned long hash;
729 int i;
730
731 hash = init_name_hash();
732 for (i = 0; i < q->len; i++)
733 hash = partial_name_hash(nls_tolower(codepage, q->name[i]),
734 hash);
735 q->hash = end_name_hash(hash);
736
737 return 0;
738}
739
740static int cifs_ci_compare(const struct dentry *parent,
741 const struct inode *pinode,
742 const struct dentry *dentry, const struct inode *inode,
743 unsigned int len, const char *str, const struct qstr *name)
744{
745 struct nls_table *codepage = CIFS_SB(pinode->i_sb)->local_nls;
746
747 if ((name->len == len) &&
748 (nls_strnicmp(codepage, name->name, str, len) == 0))
749 return 0;
750 return 1;
751}
752
753const struct dentry_operations cifs_ci_dentry_ops = {
754 .d_revalidate = cifs_d_revalidate,
755 .d_hash = cifs_ci_hash,
756 .d_compare = cifs_ci_compare,
757 .d_automount = cifs_dfs_d_automount,
758};