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 #include "cifs_unicode.h"
36
37 static void
38 renew_parental_timestamps(struct dentry *direntry)
39 {
40 /* BB check if there is a way to get the kernel to do this or if we
41 really need this */
42 do {
43 cifs_set_time(direntry, jiffies);
44 direntry = direntry->d_parent;
45 } while (!IS_ROOT(direntry));
46 }
47
48 char *
49 cifs_build_path_to_root(struct smb_vol *vol, struct cifs_sb_info *cifs_sb,
50 struct cifs_tcon *tcon, int add_treename)
51 {
52 int pplen = vol->prepath ? strlen(vol->prepath) + 1 : 0;
53 int dfsplen;
54 char *full_path = NULL;
55
56 /* if no prefix path, simply set path to the root of share to "" */
57 if (pplen == 0) {
58 full_path = kzalloc(1, GFP_KERNEL);
59 return full_path;
60 }
61
62 if (add_treename)
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; /* add trailing null */
77 return full_path;
78 }
79
80 /* Note: caller must free return buffer */
81 char *
82 build_path_from_dentry(struct dentry *direntry)
83 {
84 struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
85 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
86 bool prefix = tcon->Flags & SMB_SHARE_IS_IN_DFS;
87
88 return build_path_from_dentry_optional_prefix(direntry,
89 prefix);
90 }
91
92 char *
93 build_path_from_dentry_optional_prefix(struct dentry *direntry, bool prefix)
94 {
95 struct dentry *temp;
96 int namelen;
97 int dfsplen;
98 int pplen = 0;
99 char *full_path;
100 char dirsep;
101 struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
102 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
103 unsigned seq;
104
105 dirsep = CIFS_DIR_SEP(cifs_sb);
106 if (prefix)
107 dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1);
108 else
109 dfsplen = 0;
110
111 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
112 pplen = cifs_sb->prepath ? strlen(cifs_sb->prepath) + 1 : 0;
113
114 cifs_bp_rename_retry:
115 namelen = dfsplen + pplen;
116 seq = read_seqbegin(&rename_lock);
117 rcu_read_lock();
118 for (temp = direntry; !IS_ROOT(temp);) {
119 namelen += (1 + temp->d_name.len);
120 temp = temp->d_parent;
121 if (temp == NULL) {
122 cifs_dbg(VFS, "corrupt dentry\n");
123 rcu_read_unlock();
124 return NULL;
125 }
126 }
127 rcu_read_unlock();
128
129 full_path = kmalloc(namelen+1, GFP_KERNEL);
130 if (full_path == NULL)
131 return full_path;
132 full_path[namelen] = 0; /* trailing null */
133 rcu_read_lock();
134 for (temp = direntry; !IS_ROOT(temp);) {
135 spin_lock(&temp->d_lock);
136 namelen -= 1 + temp->d_name.len;
137 if (namelen < 0) {
138 spin_unlock(&temp->d_lock);
139 break;
140 } else {
141 full_path[namelen] = dirsep;
142 strncpy(full_path + namelen + 1, temp->d_name.name,
143 temp->d_name.len);
144 cifs_dbg(FYI, "name: %s\n", full_path + namelen);
145 }
146 spin_unlock(&temp->d_lock);
147 temp = temp->d_parent;
148 if (temp == NULL) {
149 cifs_dbg(VFS, "corrupt dentry\n");
150 rcu_read_unlock();
151 kfree(full_path);
152 return NULL;
153 }
154 }
155 rcu_read_unlock();
156 if (namelen != dfsplen + pplen || read_seqretry(&rename_lock, seq)) {
157 cifs_dbg(FYI, "did not end path lookup where expected. namelen=%ddfsplen=%d\n",
158 namelen, dfsplen);
159 /* presumably this is only possible if racing with a rename
160 of one of the parent directories (we can not lock the dentries
161 above us to prevent this, but retrying should be harmless) */
162 kfree(full_path);
163 goto cifs_bp_rename_retry;
164 }
165 /* DIR_SEP already set for byte 0 / vs \ but not for
166 subsequent slashes in prepath which currently must
167 be entered the right way - not sure if there is an alternative
168 since the '\' is a valid posix character so we can not switch
169 those safely to '/' if any are found in the middle of the prepath */
170 /* BB test paths to Windows with '/' in the midst of prepath */
171
172 if (pplen) {
173 int i;
174
175 cifs_dbg(FYI, "using cifs_sb prepath <%s>\n", cifs_sb->prepath);
176 memcpy(full_path+dfsplen+1, cifs_sb->prepath, pplen-1);
177 full_path[dfsplen] = dirsep;
178 for (i = 0; i < pplen-1; i++)
179 if (full_path[dfsplen+1+i] == '/')
180 full_path[dfsplen+1+i] = CIFS_DIR_SEP(cifs_sb);
181 }
182
183 if (dfsplen) {
184 strncpy(full_path, tcon->treeName, dfsplen);
185 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
186 int i;
187 for (i = 0; i < dfsplen; i++) {
188 if (full_path[i] == '\\')
189 full_path[i] = '/';
190 }
191 }
192 }
193 return full_path;
194 }
195
196 /*
197 * Don't allow path components longer than the server max.
198 * Don't allow the separator character in a path component.
199 * The VFS will not allow "/", but "\" is allowed by posix.
200 */
201 static int
202 check_name(struct dentry *direntry, struct cifs_tcon *tcon)
203 {
204 struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
205 int i;
206
207 if (unlikely(tcon->fsAttrInfo.MaxPathNameComponentLength &&
208 direntry->d_name.len >
209 le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength)))
210 return -ENAMETOOLONG;
211
212 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)) {
213 for (i = 0; i < direntry->d_name.len; i++) {
214 if (direntry->d_name.name[i] == '\\') {
215 cifs_dbg(FYI, "Invalid file name\n");
216 return -EINVAL;
217 }
218 }
219 }
220 return 0;
221 }
222
223
224 /* Inode operations in similar order to how they appear in Linux file fs.h */
225
226 static int
227 cifs_do_create(struct inode *inode, struct dentry *direntry, unsigned int xid,
228 struct tcon_link *tlink, unsigned oflags, umode_t mode,
229 __u32 *oplock, struct cifs_fid *fid)
230 {
231 int rc = -ENOENT;
232 int create_options = CREATE_NOT_DIR;
233 int desired_access;
234 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
235 struct cifs_tcon *tcon = tlink_tcon(tlink);
236 char *full_path = NULL;
237 FILE_ALL_INFO *buf = NULL;
238 struct inode *newinode = NULL;
239 int disposition;
240 struct TCP_Server_Info *server = tcon->ses->server;
241 struct cifs_open_parms oparms;
242
243 *oplock = 0;
244 if (tcon->ses->server->oplocks)
245 *oplock = REQ_OPLOCK;
246
247 full_path = build_path_from_dentry(direntry);
248 if (full_path == NULL) {
249 rc = -ENOMEM;
250 goto out;
251 }
252
253 if (tcon->unix_ext && cap_unix(tcon->ses) && !tcon->broken_posix_open &&
254 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
255 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
256 rc = cifs_posix_open(full_path, &newinode, inode->i_sb, mode,
257 oflags, oplock, &fid->netfid, xid);
258 switch (rc) {
259 case 0:
260 if (newinode == NULL) {
261 /* query inode info */
262 goto cifs_create_get_file_info;
263 }
264
265 if (S_ISDIR(newinode->i_mode)) {
266 CIFSSMBClose(xid, tcon, fid->netfid);
267 iput(newinode);
268 rc = -EISDIR;
269 goto out;
270 }
271
272 if (!S_ISREG(newinode->i_mode)) {
273 /*
274 * The server may allow us to open things like
275 * FIFOs, but the client isn't set up to deal
276 * with that. If it's not a regular file, just
277 * close it and proceed as if it were a normal
278 * lookup.
279 */
280 CIFSSMBClose(xid, tcon, fid->netfid);
281 goto cifs_create_get_file_info;
282 }
283 /* success, no need to query */
284 goto cifs_create_set_dentry;
285
286 case -ENOENT:
287 goto cifs_create_get_file_info;
288
289 case -EIO:
290 case -EINVAL:
291 /*
292 * EIO could indicate that (posix open) operation is not
293 * supported, despite what server claimed in capability
294 * negotiation.
295 *
296 * POSIX open in samba versions 3.3.1 and earlier could
297 * incorrectly fail with invalid parameter.
298 */
299 tcon->broken_posix_open = true;
300 break;
301
302 case -EREMOTE:
303 case -EOPNOTSUPP:
304 /*
305 * EREMOTE indicates DFS junction, which is not handled
306 * in posix open. If either that or op not supported
307 * returned, follow the normal lookup.
308 */
309 break;
310
311 default:
312 goto out;
313 }
314 /*
315 * fallthrough to retry, using older open call, this is case
316 * where server does not support this SMB level, and falsely
317 * claims capability (also get here for DFS case which should be
318 * rare for path not covered on files)
319 */
320 }
321
322 desired_access = 0;
323 if (OPEN_FMODE(oflags) & FMODE_READ)
324 desired_access |= GENERIC_READ; /* is this too little? */
325 if (OPEN_FMODE(oflags) & FMODE_WRITE)
326 desired_access |= GENERIC_WRITE;
327
328 disposition = FILE_OVERWRITE_IF;
329 if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
330 disposition = FILE_CREATE;
331 else if ((oflags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
332 disposition = FILE_OVERWRITE_IF;
333 else if ((oflags & O_CREAT) == O_CREAT)
334 disposition = FILE_OPEN_IF;
335 else
336 cifs_dbg(FYI, "Create flag not set in create function\n");
337
338 /*
339 * BB add processing to set equivalent of mode - e.g. via CreateX with
340 * ACLs
341 */
342
343 if (!server->ops->open) {
344 rc = -ENOSYS;
345 goto out;
346 }
347
348 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
349 if (buf == NULL) {
350 rc = -ENOMEM;
351 goto out;
352 }
353
354 /*
355 * if we're not using unix extensions, see if we need to set
356 * ATTR_READONLY on the create call
357 */
358 if (!tcon->unix_ext && (mode & S_IWUGO) == 0)
359 create_options |= CREATE_OPTION_READONLY;
360
361 if (backup_cred(cifs_sb))
362 create_options |= CREATE_OPEN_BACKUP_INTENT;
363
364 oparms.tcon = tcon;
365 oparms.cifs_sb = cifs_sb;
366 oparms.desired_access = desired_access;
367 oparms.create_options = create_options;
368 oparms.disposition = disposition;
369 oparms.path = full_path;
370 oparms.fid = fid;
371 oparms.reconnect = false;
372 oparms.mode = mode;
373 rc = server->ops->open(xid, &oparms, oplock, buf);
374 if (rc) {
375 cifs_dbg(FYI, "cifs_create returned 0x%x\n", rc);
376 goto out;
377 }
378
379 /*
380 * If Open reported that we actually created a file then we now have to
381 * set the mode if possible.
382 */
383 if ((tcon->unix_ext) && (*oplock & CIFS_CREATE_ACTION)) {
384 struct cifs_unix_set_info_args args = {
385 .mode = mode,
386 .ctime = NO_CHANGE_64,
387 .atime = NO_CHANGE_64,
388 .mtime = NO_CHANGE_64,
389 .device = 0,
390 };
391
392 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
393 args.uid = current_fsuid();
394 if (inode->i_mode & S_ISGID)
395 args.gid = inode->i_gid;
396 else
397 args.gid = current_fsgid();
398 } else {
399 args.uid = INVALID_UID; /* no change */
400 args.gid = INVALID_GID; /* no change */
401 }
402 CIFSSMBUnixSetFileInfo(xid, tcon, &args, fid->netfid,
403 current->tgid);
404 } else {
405 /*
406 * BB implement mode setting via Windows security
407 * descriptors e.g.
408 */
409 /* CIFSSMBWinSetPerms(xid,tcon,path,mode,-1,-1,nls);*/
410
411 /* Could set r/o dos attribute if mode & 0222 == 0 */
412 }
413
414 cifs_create_get_file_info:
415 /* server might mask mode so we have to query for it */
416 if (tcon->unix_ext)
417 rc = cifs_get_inode_info_unix(&newinode, full_path, inode->i_sb,
418 xid);
419 else {
420 rc = cifs_get_inode_info(&newinode, full_path, buf, inode->i_sb,
421 xid, fid);
422 if (newinode) {
423 if (server->ops->set_lease_key)
424 server->ops->set_lease_key(newinode, fid);
425 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
426 newinode->i_mode = mode;
427 if ((*oplock & CIFS_CREATE_ACTION) &&
428 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)) {
429 newinode->i_uid = current_fsuid();
430 if (inode->i_mode & S_ISGID)
431 newinode->i_gid = inode->i_gid;
432 else
433 newinode->i_gid = current_fsgid();
434 }
435 }
436 }
437
438 cifs_create_set_dentry:
439 if (rc != 0) {
440 cifs_dbg(FYI, "Create worked, get_inode_info failed rc = %d\n",
441 rc);
442 goto out_err;
443 }
444
445 if (S_ISDIR(newinode->i_mode)) {
446 rc = -EISDIR;
447 goto out_err;
448 }
449
450 d_drop(direntry);
451 d_add(direntry, newinode);
452
453 out:
454 kfree(buf);
455 kfree(full_path);
456 return rc;
457
458 out_err:
459 if (server->ops->close)
460 server->ops->close(xid, tcon, fid);
461 if (newinode)
462 iput(newinode);
463 goto out;
464 }
465
466 int
467 cifs_atomic_open(struct inode *inode, struct dentry *direntry,
468 struct file *file, unsigned oflags, umode_t mode)
469 {
470 int rc;
471 unsigned int xid;
472 struct tcon_link *tlink;
473 struct cifs_tcon *tcon;
474 struct TCP_Server_Info *server;
475 struct cifs_fid fid;
476 struct cifs_pending_open open;
477 __u32 oplock;
478 struct cifsFileInfo *file_info;
479
480 /*
481 * Posix open is only called (at lookup time) for file create now. For
482 * opens (rather than creates), because we do not know if it is a file
483 * or directory yet, and current Samba no longer allows us to do posix
484 * open on dirs, we could end up wasting an open call on what turns out
485 * to be a dir. For file opens, we wait to call posix open till
486 * cifs_open. It could be added to atomic_open in the future but the
487 * performance tradeoff of the extra network request when EISDIR or
488 * EACCES is returned would have to be weighed against the 50% reduction
489 * in network traffic in the other paths.
490 */
491 if (!(oflags & O_CREAT)) {
492 struct dentry *res;
493
494 /*
495 * Check for hashed negative dentry. We have already revalidated
496 * the dentry and it is fine. No need to perform another lookup.
497 */
498 if (!d_in_lookup(direntry))
499 return -ENOENT;
500
501 res = cifs_lookup(inode, direntry, 0);
502 if (IS_ERR(res))
503 return PTR_ERR(res);
504
505 return finish_no_open(file, res);
506 }
507
508 xid = get_xid();
509
510 cifs_dbg(FYI, "parent inode = 0x%p name is: %pd and dentry = 0x%p\n",
511 inode, direntry, direntry);
512
513 tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb));
514 if (IS_ERR(tlink)) {
515 rc = PTR_ERR(tlink);
516 goto out_free_xid;
517 }
518
519 tcon = tlink_tcon(tlink);
520
521 rc = check_name(direntry, tcon);
522 if (rc)
523 goto out;
524
525 server = tcon->ses->server;
526
527 if (server->ops->new_lease_key)
528 server->ops->new_lease_key(&fid);
529
530 cifs_add_pending_open(&fid, tlink, &open);
531
532 rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode,
533 &oplock, &fid);
534
535 if (rc) {
536 cifs_del_pending_open(&open);
537 goto out;
538 }
539
540 if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
541 file->f_mode |= FMODE_CREATED;
542
543 rc = finish_open(file, direntry, generic_file_open);
544 if (rc) {
545 if (server->ops->close)
546 server->ops->close(xid, tcon, &fid);
547 cifs_del_pending_open(&open);
548 goto out;
549 }
550
551 if (file->f_flags & O_DIRECT &&
552 CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) {
553 if (CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
554 file->f_op = &cifs_file_direct_nobrl_ops;
555 else
556 file->f_op = &cifs_file_direct_ops;
557 }
558
559 file_info = cifs_new_fileinfo(&fid, file, tlink, oplock);
560 if (file_info == NULL) {
561 if (server->ops->close)
562 server->ops->close(xid, tcon, &fid);
563 cifs_del_pending_open(&open);
564 fput(file);
565 rc = -ENOMEM;
566 }
567
568 out:
569 cifs_put_tlink(tlink);
570 out_free_xid:
571 free_xid(xid);
572 return rc;
573 }
574
575 int cifs_create(struct inode *inode, struct dentry *direntry, umode_t mode,
576 bool excl)
577 {
578 int rc;
579 unsigned int xid = get_xid();
580 /*
581 * BB below access is probably too much for mknod to request
582 * but we have to do query and setpathinfo so requesting
583 * less could fail (unless we want to request getatr and setatr
584 * permissions (only). At least for POSIX we do not have to
585 * request so much.
586 */
587 unsigned oflags = O_EXCL | O_CREAT | O_RDWR;
588 struct tcon_link *tlink;
589 struct cifs_tcon *tcon;
590 struct TCP_Server_Info *server;
591 struct cifs_fid fid;
592 __u32 oplock;
593
594 cifs_dbg(FYI, "cifs_create parent inode = 0x%p name is: %pd and dentry = 0x%p\n",
595 inode, direntry, direntry);
596
597 tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb));
598 rc = PTR_ERR(tlink);
599 if (IS_ERR(tlink))
600 goto out_free_xid;
601
602 tcon = tlink_tcon(tlink);
603 server = tcon->ses->server;
604
605 if (server->ops->new_lease_key)
606 server->ops->new_lease_key(&fid);
607
608 rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode,
609 &oplock, &fid);
610 if (!rc && server->ops->close)
611 server->ops->close(xid, tcon, &fid);
612
613 cifs_put_tlink(tlink);
614 out_free_xid:
615 free_xid(xid);
616 return rc;
617 }
618
619 int cifs_mknod(struct inode *inode, struct dentry *direntry, umode_t mode,
620 dev_t device_number)
621 {
622 int rc = -EPERM;
623 unsigned int xid;
624 struct cifs_sb_info *cifs_sb;
625 struct tcon_link *tlink;
626 struct cifs_tcon *tcon;
627 char *full_path = NULL;
628
629 if (!old_valid_dev(device_number))
630 return -EINVAL;
631
632 cifs_sb = CIFS_SB(inode->i_sb);
633 tlink = cifs_sb_tlink(cifs_sb);
634 if (IS_ERR(tlink))
635 return PTR_ERR(tlink);
636
637 tcon = tlink_tcon(tlink);
638
639 xid = get_xid();
640
641 full_path = build_path_from_dentry(direntry);
642 if (full_path == NULL) {
643 rc = -ENOMEM;
644 goto mknod_out;
645 }
646
647 rc = tcon->ses->server->ops->make_node(xid, inode, direntry, tcon,
648 full_path, mode,
649 device_number);
650
651 mknod_out:
652 kfree(full_path);
653 free_xid(xid);
654 cifs_put_tlink(tlink);
655 return rc;
656 }
657
658 struct dentry *
659 cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
660 unsigned int flags)
661 {
662 unsigned int xid;
663 int rc = 0; /* to get around spurious gcc warning, set to zero here */
664 struct cifs_sb_info *cifs_sb;
665 struct tcon_link *tlink;
666 struct cifs_tcon *pTcon;
667 struct inode *newInode = NULL;
668 char *full_path = NULL;
669
670 xid = get_xid();
671
672 cifs_dbg(FYI, "parent inode = 0x%p name is: %pd and dentry = 0x%p\n",
673 parent_dir_inode, direntry, direntry);
674
675 /* check whether path exists */
676
677 cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
678 tlink = cifs_sb_tlink(cifs_sb);
679 if (IS_ERR(tlink)) {
680 free_xid(xid);
681 return ERR_CAST(tlink);
682 }
683 pTcon = tlink_tcon(tlink);
684
685 rc = check_name(direntry, pTcon);
686 if (unlikely(rc)) {
687 cifs_put_tlink(tlink);
688 free_xid(xid);
689 return ERR_PTR(rc);
690 }
691
692 /* can not grab the rename sem here since it would
693 deadlock in the cases (beginning of sys_rename itself)
694 in which we already have the sb rename sem */
695 full_path = build_path_from_dentry(direntry);
696 if (full_path == NULL) {
697 cifs_put_tlink(tlink);
698 free_xid(xid);
699 return ERR_PTR(-ENOMEM);
700 }
701
702 if (d_really_is_positive(direntry)) {
703 cifs_dbg(FYI, "non-NULL inode in lookup\n");
704 } else {
705 cifs_dbg(FYI, "NULL inode in lookup\n");
706 }
707 cifs_dbg(FYI, "Full path: %s inode = 0x%p\n",
708 full_path, d_inode(direntry));
709
710 if (pTcon->unix_ext) {
711 rc = cifs_get_inode_info_unix(&newInode, full_path,
712 parent_dir_inode->i_sb, xid);
713 } else {
714 rc = cifs_get_inode_info(&newInode, full_path, NULL,
715 parent_dir_inode->i_sb, xid, NULL);
716 }
717
718 if (rc == 0) {
719 /* since paths are not looked up by component - the parent
720 directories are presumed to be good here */
721 renew_parental_timestamps(direntry);
722 } else if (rc == -ENOENT) {
723 cifs_set_time(direntry, jiffies);
724 newInode = NULL;
725 } else {
726 if (rc != -EACCES) {
727 cifs_dbg(FYI, "Unexpected lookup error %d\n", rc);
728 /* We special case check for Access Denied - since that
729 is a common return code */
730 }
731 newInode = ERR_PTR(rc);
732 }
733 kfree(full_path);
734 cifs_put_tlink(tlink);
735 free_xid(xid);
736 return d_splice_alias(newInode, direntry);
737 }
738
739 static int
740 cifs_d_revalidate(struct dentry *direntry, unsigned int flags)
741 {
742 if (flags & LOOKUP_RCU)
743 return -ECHILD;
744
745 if (d_really_is_positive(direntry)) {
746 if (cifs_revalidate_dentry(direntry))
747 return 0;
748 else {
749 /*
750 * If the inode wasn't known to be a dfs entry when
751 * the dentry was instantiated, such as when created
752 * via ->readdir(), it needs to be set now since the
753 * attributes will have been updated by
754 * cifs_revalidate_dentry().
755 */
756 if (IS_AUTOMOUNT(d_inode(direntry)) &&
757 !(direntry->d_flags & DCACHE_NEED_AUTOMOUNT)) {
758 spin_lock(&direntry->d_lock);
759 direntry->d_flags |= DCACHE_NEED_AUTOMOUNT;
760 spin_unlock(&direntry->d_lock);
761 }
762
763 return 1;
764 }
765 }
766
767 /*
768 * This may be nfsd (or something), anyway, we can't see the
769 * intent of this. So, since this can be for creation, drop it.
770 */
771 if (!flags)
772 return 0;
773
774 /*
775 * Drop the negative dentry, in order to make sure to use the
776 * case sensitive name which is specified by user if this is
777 * for creation.
778 */
779 if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
780 return 0;
781
782 if (time_after(jiffies, cifs_get_time(direntry) + HZ) || !lookupCacheEnabled)
783 return 0;
784
785 return 1;
786 }
787
788 /* static int cifs_d_delete(struct dentry *direntry)
789 {
790 int rc = 0;
791
792 cifs_dbg(FYI, "In cifs d_delete, name = %pd\n", direntry);
793
794 return rc;
795 } */
796
797 const struct dentry_operations cifs_dentry_ops = {
798 .d_revalidate = cifs_d_revalidate,
799 .d_automount = cifs_dfs_d_automount,
800 /* d_delete: cifs_d_delete, */ /* not needed except for debugging */
801 };
802
803 static int cifs_ci_hash(const struct dentry *dentry, struct qstr *q)
804 {
805 struct nls_table *codepage = CIFS_SB(dentry->d_sb)->local_nls;
806 unsigned long hash;
807 wchar_t c;
808 int i, charlen;
809
810 hash = init_name_hash(dentry);
811 for (i = 0; i < q->len; i += charlen) {
812 charlen = codepage->char2uni(&q->name[i], q->len - i, &c);
813 /* error out if we can't convert the character */
814 if (unlikely(charlen < 0))
815 return charlen;
816 hash = partial_name_hash(cifs_toupper(c), hash);
817 }
818 q->hash = end_name_hash(hash);
819
820 return 0;
821 }
822
823 static int cifs_ci_compare(const struct dentry *dentry,
824 unsigned int len, const char *str, const struct qstr *name)
825 {
826 struct nls_table *codepage = CIFS_SB(dentry->d_sb)->local_nls;
827 wchar_t c1, c2;
828 int i, l1, l2;
829
830 /*
831 * We make the assumption here that uppercase characters in the local
832 * codepage are always the same length as their lowercase counterparts.
833 *
834 * If that's ever not the case, then this will fail to match it.
835 */
836 if (name->len != len)
837 return 1;
838
839 for (i = 0; i < len; i += l1) {
840 /* Convert characters in both strings to UTF-16. */
841 l1 = codepage->char2uni(&str[i], len - i, &c1);
842 l2 = codepage->char2uni(&name->name[i], name->len - i, &c2);
843
844 /*
845 * If we can't convert either character, just declare it to
846 * be 1 byte long and compare the original byte.
847 */
848 if (unlikely(l1 < 0 && l2 < 0)) {
849 if (str[i] != name->name[i])
850 return 1;
851 l1 = 1;
852 continue;
853 }
854
855 /*
856 * Here, we again ass|u|me that upper/lowercase versions of
857 * a character are the same length in the local NLS.
858 */
859 if (l1 != l2)
860 return 1;
861
862 /* Now compare uppercase versions of these characters */
863 if (cifs_toupper(c1) != cifs_toupper(c2))
864 return 1;
865 }
866
867 return 0;
868 }
869
870 const struct dentry_operations cifs_ci_dentry_ops = {
871 .d_revalidate = cifs_d_revalidate,
872 .d_hash = cifs_ci_hash,
873 .d_compare = cifs_ci_compare,
874 .d_automount = cifs_dfs_d_automount,
875 };
876
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