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
36 static void
renew_parental_timestamps(struct dentry * direntry)37 renew_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 */
48 char *
build_path_from_dentry(struct dentry * direntry)49 build_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;
65 cifs_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
138 int
cifs_create(struct inode * inode,struct dentry * direntry,umode_t mode,struct nameidata * nd)139 cifs_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 (enable_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
301 cifs_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
323 cifs_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
350 cifs_create_out:
351 kfree(buf);
352 kfree(full_path);
353 cifs_put_tlink(tlink);
354 FreeXid(xid);
355 return rc;
356 }
357
cifs_mknod(struct inode * inode,struct dentry * direntry,umode_t mode,dev_t device_number)358 int 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
481 mknod_out:
482 kfree(full_path);
483 kfree(buf);
484 FreeXid(xid);
485 cifs_put_tlink(tlink);
486 return rc;
487 }
488
489 struct dentry *
cifs_lookup(struct inode * parent_dir_inode,struct dentry * direntry,struct nameidata * nd)490 cifs_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 = enable_oplocks ? REQ_OPLOCK : 0;
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 /*
522 * Don't allow the separator character in a path component.
523 * The VFS will not allow "/", but "\" is allowed by posix.
524 */
525 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)) {
526 int i;
527 for (i = 0; i < direntry->d_name.len; i++)
528 if (direntry->d_name.name[i] == '\\') {
529 cFYI(1, "Invalid file name");
530 rc = -EINVAL;
531 goto lookup_out;
532 }
533 }
534
535 /*
536 * O_EXCL: optimize away the lookup, but don't hash the dentry. Let
537 * the VFS handle the create.
538 */
539 if (nd && (nd->flags & LOOKUP_EXCL)) {
540 d_instantiate(direntry, NULL);
541 rc = 0;
542 goto lookup_out;
543 }
544
545 /* can not grab the rename sem here since it would
546 deadlock in the cases (beginning of sys_rename itself)
547 in which we already have the sb rename sem */
548 full_path = build_path_from_dentry(direntry);
549 if (full_path == NULL) {
550 rc = -ENOMEM;
551 goto lookup_out;
552 }
553
554 if (direntry->d_inode != NULL) {
555 cFYI(1, "non-NULL inode in lookup");
556 } else {
557 cFYI(1, "NULL inode in lookup");
558 }
559 cFYI(1, "Full path: %s inode = 0x%p", full_path, direntry->d_inode);
560
561 /* Posix open is only called (at lookup time) for file create now.
562 * For opens (rather than creates), because we do not know if it
563 * is a file or directory yet, and current Samba no longer allows
564 * us to do posix open on dirs, we could end up wasting an open call
565 * on what turns out to be a dir. For file opens, we wait to call posix
566 * open till cifs_open. It could be added here (lookup) in the future
567 * but the performance tradeoff of the extra network request when EISDIR
568 * or EACCES is returned would have to be weighed against the 50%
569 * reduction in network traffic in the other paths.
570 */
571 if (pTcon->unix_ext) {
572 if (nd && !(nd->flags & LOOKUP_DIRECTORY) &&
573 (nd->flags & LOOKUP_OPEN) && !pTcon->broken_posix_open &&
574 (nd->intent.open.file->f_flags & O_CREAT)) {
575 rc = cifs_posix_open(full_path, &newInode,
576 parent_dir_inode->i_sb,
577 nd->intent.open.create_mode,
578 nd->intent.open.file->f_flags, &oplock,
579 &fileHandle, xid);
580 /*
581 * The check below works around a bug in POSIX
582 * open in samba versions 3.3.1 and earlier where
583 * open could incorrectly fail with invalid parameter.
584 * If either that or op not supported returned, follow
585 * the normal lookup.
586 */
587 switch (rc) {
588 case 0:
589 /*
590 * The server may allow us to open things like
591 * FIFOs, but the client isn't set up to deal
592 * with that. If it's not a regular file, just
593 * close it and proceed as if it were a normal
594 * lookup.
595 */
596 if (newInode && !S_ISREG(newInode->i_mode)) {
597 CIFSSMBClose(xid, pTcon, fileHandle);
598 break;
599 }
600 case -ENOENT:
601 posix_open = true;
602 case -EOPNOTSUPP:
603 break;
604 default:
605 pTcon->broken_posix_open = true;
606 }
607 }
608 if (!posix_open)
609 rc = cifs_get_inode_info_unix(&newInode, full_path,
610 parent_dir_inode->i_sb, xid);
611 } else
612 rc = cifs_get_inode_info(&newInode, full_path, NULL,
613 parent_dir_inode->i_sb, xid, NULL);
614
615 if ((rc == 0) && (newInode != NULL)) {
616 d_add(direntry, newInode);
617 if (posix_open) {
618 filp = lookup_instantiate_filp(nd, direntry,
619 generic_file_open);
620 if (IS_ERR(filp)) {
621 rc = PTR_ERR(filp);
622 CIFSSMBClose(xid, pTcon, fileHandle);
623 goto lookup_out;
624 }
625
626 cfile = cifs_new_fileinfo(fileHandle, filp, tlink,
627 oplock);
628 if (cfile == NULL) {
629 fput(filp);
630 CIFSSMBClose(xid, pTcon, fileHandle);
631 rc = -ENOMEM;
632 goto lookup_out;
633 }
634 }
635 /* since paths are not looked up by component - the parent
636 directories are presumed to be good here */
637 renew_parental_timestamps(direntry);
638
639 } else if (rc == -ENOENT) {
640 rc = 0;
641 direntry->d_time = jiffies;
642 d_add(direntry, NULL);
643 /* if it was once a directory (but how can we tell?) we could do
644 shrink_dcache_parent(direntry); */
645 } else if (rc != -EACCES) {
646 cERROR(1, "Unexpected lookup error %d", rc);
647 /* We special case check for Access Denied - since that
648 is a common return code */
649 }
650
651 lookup_out:
652 kfree(full_path);
653 cifs_put_tlink(tlink);
654 FreeXid(xid);
655 return ERR_PTR(rc);
656 }
657
658 static int
cifs_d_revalidate(struct dentry * direntry,struct nameidata * nd)659 cifs_d_revalidate(struct dentry *direntry, struct nameidata *nd)
660 {
661 if (nd && (nd->flags & LOOKUP_RCU))
662 return -ECHILD;
663
664 if (direntry->d_inode) {
665 if (cifs_revalidate_dentry(direntry))
666 return 0;
667 else {
668 /*
669 * Forcibly invalidate automounting directory inodes
670 * (remote DFS directories) so to have them
671 * instantiated again for automount
672 */
673 if (IS_AUTOMOUNT(direntry->d_inode))
674 return 0;
675 return 1;
676 }
677 }
678
679 /*
680 * This may be nfsd (or something), anyway, we can't see the
681 * intent of this. So, since this can be for creation, drop it.
682 */
683 if (!nd)
684 return 0;
685
686 /*
687 * Drop the negative dentry, in order to make sure to use the
688 * case sensitive name which is specified by user if this is
689 * for creation.
690 */
691 if (nd->flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
692 return 0;
693
694 if (time_after(jiffies, direntry->d_time + HZ) || !lookupCacheEnabled)
695 return 0;
696
697 return 1;
698 }
699
700 /* static int cifs_d_delete(struct dentry *direntry)
701 {
702 int rc = 0;
703
704 cFYI(1, "In cifs d_delete, name = %s", direntry->d_name.name);
705
706 return rc;
707 } */
708
709 const struct dentry_operations cifs_dentry_ops = {
710 .d_revalidate = cifs_d_revalidate,
711 .d_automount = cifs_dfs_d_automount,
712 /* d_delete: cifs_d_delete, */ /* not needed except for debugging */
713 };
714
cifs_ci_hash(const struct dentry * dentry,const struct inode * inode,struct qstr * q)715 static int cifs_ci_hash(const struct dentry *dentry, const struct inode *inode,
716 struct qstr *q)
717 {
718 struct nls_table *codepage = CIFS_SB(dentry->d_sb)->local_nls;
719 unsigned long hash;
720 int i;
721
722 hash = init_name_hash();
723 for (i = 0; i < q->len; i++)
724 hash = partial_name_hash(nls_tolower(codepage, q->name[i]),
725 hash);
726 q->hash = end_name_hash(hash);
727
728 return 0;
729 }
730
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)731 static int cifs_ci_compare(const struct dentry *parent,
732 const struct inode *pinode,
733 const struct dentry *dentry, const struct inode *inode,
734 unsigned int len, const char *str, const struct qstr *name)
735 {
736 struct nls_table *codepage = CIFS_SB(pinode->i_sb)->local_nls;
737
738 if ((name->len == len) &&
739 (nls_strnicmp(codepage, name->name, str, len) == 0))
740 return 0;
741 return 1;
742 }
743
744 const struct dentry_operations cifs_ci_dentry_ops = {
745 .d_revalidate = cifs_d_revalidate,
746 .d_hash = cifs_ci_hash,
747 .d_compare = cifs_ci_compare,
748 .d_automount = cifs_dfs_d_automount,
749 };
750