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] = '\\';
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 the separator character in a path component.
198 * The VFS will not allow "/", but "\" is allowed by posix.
199 */
200 static int
201 check_name(struct dentry *direntry)
202 {
203 struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
204 int i;
205
206 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)) {
207 for (i = 0; i < direntry->d_name.len; i++) {
208 if (direntry->d_name.name[i] == '\\') {
209 cifs_dbg(FYI, "Invalid file name\n");
210 return -EINVAL;
211 }
212 }
213 }
214 return 0;
215 }
216
217
218 /* Inode operations in similar order to how they appear in Linux file fs.h */
219
220 static int
221 cifs_do_create(struct inode *inode, struct dentry *direntry, unsigned int xid,
222 struct tcon_link *tlink, unsigned oflags, umode_t mode,
223 __u32 *oplock, struct cifs_fid *fid)
224 {
225 int rc = -ENOENT;
226 int create_options = CREATE_NOT_DIR;
227 int desired_access;
228 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
229 struct cifs_tcon *tcon = tlink_tcon(tlink);
230 char *full_path = NULL;
231 FILE_ALL_INFO *buf = NULL;
232 struct inode *newinode = NULL;
233 int disposition;
234 struct TCP_Server_Info *server = tcon->ses->server;
235 struct cifs_open_parms oparms;
236
237 *oplock = 0;
238 if (tcon->ses->server->oplocks)
239 *oplock = REQ_OPLOCK;
240
241 full_path = build_path_from_dentry(direntry);
242 if (full_path == NULL) {
243 rc = -ENOMEM;
244 goto out;
245 }
246
247 if (tcon->unix_ext && cap_unix(tcon->ses) && !tcon->broken_posix_open &&
248 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
249 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
250 rc = cifs_posix_open(full_path, &newinode, inode->i_sb, mode,
251 oflags, oplock, &fid->netfid, xid);
252 switch (rc) {
253 case 0:
254 if (newinode == NULL) {
255 /* query inode info */
256 goto cifs_create_get_file_info;
257 }
258
259 if (S_ISDIR(newinode->i_mode)) {
260 CIFSSMBClose(xid, tcon, fid->netfid);
261 iput(newinode);
262 rc = -EISDIR;
263 goto out;
264 }
265
266 if (!S_ISREG(newinode->i_mode)) {
267 /*
268 * The server may allow us to open things like
269 * FIFOs, but the client isn't set up to deal
270 * with that. If it's not a regular file, just
271 * close it and proceed as if it were a normal
272 * lookup.
273 */
274 CIFSSMBClose(xid, tcon, fid->netfid);
275 goto cifs_create_get_file_info;
276 }
277 /* success, no need to query */
278 goto cifs_create_set_dentry;
279
280 case -ENOENT:
281 goto cifs_create_get_file_info;
282
283 case -EIO:
284 case -EINVAL:
285 /*
286 * EIO could indicate that (posix open) operation is not
287 * supported, despite what server claimed in capability
288 * negotiation.
289 *
290 * POSIX open in samba versions 3.3.1 and earlier could
291 * incorrectly fail with invalid parameter.
292 */
293 tcon->broken_posix_open = true;
294 break;
295
296 case -EREMOTE:
297 case -EOPNOTSUPP:
298 /*
299 * EREMOTE indicates DFS junction, which is not handled
300 * in posix open. If either that or op not supported
301 * returned, follow the normal lookup.
302 */
303 break;
304
305 default:
306 goto out;
307 }
308 /*
309 * fallthrough to retry, using older open call, this is case
310 * where server does not support this SMB level, and falsely
311 * claims capability (also get here for DFS case which should be
312 * rare for path not covered on files)
313 */
314 }
315
316 desired_access = 0;
317 if (OPEN_FMODE(oflags) & FMODE_READ)
318 desired_access |= GENERIC_READ; /* is this too little? */
319 if (OPEN_FMODE(oflags) & FMODE_WRITE)
320 desired_access |= GENERIC_WRITE;
321
322 disposition = FILE_OVERWRITE_IF;
323 if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
324 disposition = FILE_CREATE;
325 else if ((oflags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
326 disposition = FILE_OVERWRITE_IF;
327 else if ((oflags & O_CREAT) == O_CREAT)
328 disposition = FILE_OPEN_IF;
329 else
330 cifs_dbg(FYI, "Create flag not set in create function\n");
331
332 /*
333 * BB add processing to set equivalent of mode - e.g. via CreateX with
334 * ACLs
335 */
336
337 if (!server->ops->open) {
338 rc = -ENOSYS;
339 goto out;
340 }
341
342 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
343 if (buf == NULL) {
344 rc = -ENOMEM;
345 goto out;
346 }
347
348 /*
349 * if we're not using unix extensions, see if we need to set
350 * ATTR_READONLY on the create call
351 */
352 if (!tcon->unix_ext && (mode & S_IWUGO) == 0)
353 create_options |= CREATE_OPTION_READONLY;
354
355 if (backup_cred(cifs_sb))
356 create_options |= CREATE_OPEN_BACKUP_INTENT;
357
358 oparms.tcon = tcon;
359 oparms.cifs_sb = cifs_sb;
360 oparms.desired_access = desired_access;
361 oparms.create_options = create_options;
362 oparms.disposition = disposition;
363 oparms.path = full_path;
364 oparms.fid = fid;
365 oparms.reconnect = false;
366
367 rc = server->ops->open(xid, &oparms, oplock, buf);
368 if (rc) {
369 cifs_dbg(FYI, "cifs_create returned 0x%x\n", rc);
370 goto out;
371 }
372
373 /*
374 * If Open reported that we actually created a file then we now have to
375 * set the mode if possible.
376 */
377 if ((tcon->unix_ext) && (*oplock & CIFS_CREATE_ACTION)) {
378 struct cifs_unix_set_info_args args = {
379 .mode = mode,
380 .ctime = NO_CHANGE_64,
381 .atime = NO_CHANGE_64,
382 .mtime = NO_CHANGE_64,
383 .device = 0,
384 };
385
386 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
387 args.uid = current_fsuid();
388 if (inode->i_mode & S_ISGID)
389 args.gid = inode->i_gid;
390 else
391 args.gid = current_fsgid();
392 } else {
393 args.uid = INVALID_UID; /* no change */
394 args.gid = INVALID_GID; /* no change */
395 }
396 CIFSSMBUnixSetFileInfo(xid, tcon, &args, fid->netfid,
397 current->tgid);
398 } else {
399 /*
400 * BB implement mode setting via Windows security
401 * descriptors e.g.
402 */
403 /* CIFSSMBWinSetPerms(xid,tcon,path,mode,-1,-1,nls);*/
404
405 /* Could set r/o dos attribute if mode & 0222 == 0 */
406 }
407
408 cifs_create_get_file_info:
409 /* server might mask mode so we have to query for it */
410 if (tcon->unix_ext)
411 rc = cifs_get_inode_info_unix(&newinode, full_path, inode->i_sb,
412 xid);
413 else {
414 rc = cifs_get_inode_info(&newinode, full_path, buf, inode->i_sb,
415 xid, fid);
416 if (newinode) {
417 if (server->ops->set_lease_key)
418 server->ops->set_lease_key(newinode, fid);
419 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
420 newinode->i_mode = mode;
421 if ((*oplock & CIFS_CREATE_ACTION) &&
422 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)) {
423 newinode->i_uid = current_fsuid();
424 if (inode->i_mode & S_ISGID)
425 newinode->i_gid = inode->i_gid;
426 else
427 newinode->i_gid = current_fsgid();
428 }
429 }
430 }
431
432 cifs_create_set_dentry:
433 if (rc != 0) {
434 cifs_dbg(FYI, "Create worked, get_inode_info failed rc = %d\n",
435 rc);
436 goto out_err;
437 }
438
439 if (S_ISDIR(newinode->i_mode)) {
440 rc = -EISDIR;
441 goto out_err;
442 }
443
444 d_drop(direntry);
445 d_add(direntry, newinode);
446
447 out:
448 kfree(buf);
449 kfree(full_path);
450 return rc;
451
452 out_err:
453 if (server->ops->close)
454 server->ops->close(xid, tcon, fid);
455 if (newinode)
456 iput(newinode);
457 goto out;
458 }
459
460 int
461 cifs_atomic_open(struct inode *inode, struct dentry *direntry,
462 struct file *file, unsigned oflags, umode_t mode,
463 int *opened)
464 {
465 int rc;
466 unsigned int xid;
467 struct tcon_link *tlink;
468 struct cifs_tcon *tcon;
469 struct TCP_Server_Info *server;
470 struct cifs_fid fid;
471 struct cifs_pending_open open;
472 __u32 oplock;
473 struct cifsFileInfo *file_info;
474
475 /*
476 * Posix open is only called (at lookup time) for file create now. For
477 * opens (rather than creates), because we do not know if it is a file
478 * or directory yet, and current Samba no longer allows us to do posix
479 * open on dirs, we could end up wasting an open call on what turns out
480 * to be a dir. For file opens, we wait to call posix open till
481 * cifs_open. It could be added to atomic_open in the future but the
482 * performance tradeoff of the extra network request when EISDIR or
483 * EACCES is returned would have to be weighed against the 50% reduction
484 * in network traffic in the other paths.
485 */
486 if (!(oflags & O_CREAT)) {
487 struct dentry *res;
488
489 /*
490 * Check for hashed negative dentry. We have already revalidated
491 * the dentry and it is fine. No need to perform another lookup.
492 */
493 if (!d_in_lookup(direntry))
494 return -ENOENT;
495
496 res = cifs_lookup(inode, direntry, 0);
497 if (IS_ERR(res))
498 return PTR_ERR(res);
499
500 return finish_no_open(file, res);
501 }
502
503 rc = check_name(direntry);
504 if (rc)
505 return rc;
506
507 xid = get_xid();
508
509 cifs_dbg(FYI, "parent inode = 0x%p name is: %pd and dentry = 0x%p\n",
510 inode, direntry, direntry);
511
512 tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb));
513 if (IS_ERR(tlink)) {
514 rc = PTR_ERR(tlink);
515 goto out_free_xid;
516 }
517
518 tcon = tlink_tcon(tlink);
519 server = tcon->ses->server;
520
521 if (server->ops->new_lease_key)
522 server->ops->new_lease_key(&fid);
523
524 cifs_add_pending_open(&fid, tlink, &open);
525
526 rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode,
527 &oplock, &fid);
528
529 if (rc) {
530 cifs_del_pending_open(&open);
531 goto out;
532 }
533
534 if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
535 *opened |= FILE_CREATED;
536
537 rc = finish_open(file, direntry, generic_file_open, opened);
538 if (rc) {
539 if (server->ops->close)
540 server->ops->close(xid, tcon, &fid);
541 cifs_del_pending_open(&open);
542 goto out;
543 }
544
545 if (file->f_flags & O_DIRECT &&
546 CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) {
547 if (CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
548 file->f_op = &cifs_file_direct_nobrl_ops;
549 else
550 file->f_op = &cifs_file_direct_ops;
551 }
552
553 file_info = cifs_new_fileinfo(&fid, file, tlink, oplock);
554 if (file_info == NULL) {
555 if (server->ops->close)
556 server->ops->close(xid, tcon, &fid);
557 cifs_del_pending_open(&open);
558 fput(file);
559 rc = -ENOMEM;
560 }
561
562 out:
563 cifs_put_tlink(tlink);
564 out_free_xid:
565 free_xid(xid);
566 return rc;
567 }
568
569 int cifs_create(struct inode *inode, struct dentry *direntry, umode_t mode,
570 bool excl)
571 {
572 int rc;
573 unsigned int xid = get_xid();
574 /*
575 * BB below access is probably too much for mknod to request
576 * but we have to do query and setpathinfo so requesting
577 * less could fail (unless we want to request getatr and setatr
578 * permissions (only). At least for POSIX we do not have to
579 * request so much.
580 */
581 unsigned oflags = O_EXCL | O_CREAT | O_RDWR;
582 struct tcon_link *tlink;
583 struct cifs_tcon *tcon;
584 struct TCP_Server_Info *server;
585 struct cifs_fid fid;
586 __u32 oplock;
587
588 cifs_dbg(FYI, "cifs_create parent inode = 0x%p name is: %pd and dentry = 0x%p\n",
589 inode, direntry, direntry);
590
591 tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb));
592 rc = PTR_ERR(tlink);
593 if (IS_ERR(tlink))
594 goto out_free_xid;
595
596 tcon = tlink_tcon(tlink);
597 server = tcon->ses->server;
598
599 if (server->ops->new_lease_key)
600 server->ops->new_lease_key(&fid);
601
602 rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode,
603 &oplock, &fid);
604 if (!rc && server->ops->close)
605 server->ops->close(xid, tcon, &fid);
606
607 cifs_put_tlink(tlink);
608 out_free_xid:
609 free_xid(xid);
610 return rc;
611 }
612
613 int cifs_mknod(struct inode *inode, struct dentry *direntry, umode_t mode,
614 dev_t device_number)
615 {
616 int rc = -EPERM;
617 unsigned int xid;
618 int create_options = CREATE_NOT_DIR | CREATE_OPTION_SPECIAL;
619 struct cifs_sb_info *cifs_sb;
620 struct tcon_link *tlink;
621 struct cifs_tcon *tcon;
622 struct cifs_io_parms io_parms;
623 char *full_path = NULL;
624 struct inode *newinode = NULL;
625 __u32 oplock = 0;
626 struct cifs_fid fid;
627 struct cifs_open_parms oparms;
628 FILE_ALL_INFO *buf = NULL;
629 unsigned int bytes_written;
630 struct win_dev *pdev;
631 struct kvec iov[2];
632
633 if (!old_valid_dev(device_number))
634 return -EINVAL;
635
636 cifs_sb = CIFS_SB(inode->i_sb);
637 tlink = cifs_sb_tlink(cifs_sb);
638 if (IS_ERR(tlink))
639 return PTR_ERR(tlink);
640
641 tcon = tlink_tcon(tlink);
642
643 xid = get_xid();
644
645 full_path = build_path_from_dentry(direntry);
646 if (full_path == NULL) {
647 rc = -ENOMEM;
648 goto mknod_out;
649 }
650
651 if (tcon->unix_ext) {
652 struct cifs_unix_set_info_args args = {
653 .mode = mode & ~current_umask(),
654 .ctime = NO_CHANGE_64,
655 .atime = NO_CHANGE_64,
656 .mtime = NO_CHANGE_64,
657 .device = device_number,
658 };
659 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
660 args.uid = current_fsuid();
661 args.gid = current_fsgid();
662 } else {
663 args.uid = INVALID_UID; /* no change */
664 args.gid = INVALID_GID; /* no change */
665 }
666 rc = CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args,
667 cifs_sb->local_nls,
668 cifs_remap(cifs_sb));
669 if (rc)
670 goto mknod_out;
671
672 rc = cifs_get_inode_info_unix(&newinode, full_path,
673 inode->i_sb, xid);
674
675 if (rc == 0)
676 d_instantiate(direntry, newinode);
677 goto mknod_out;
678 }
679
680 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL))
681 goto mknod_out;
682
683
684 cifs_dbg(FYI, "sfu compat create special file\n");
685
686 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
687 if (buf == NULL) {
688 kfree(full_path);
689 rc = -ENOMEM;
690 free_xid(xid);
691 return rc;
692 }
693
694 if (backup_cred(cifs_sb))
695 create_options |= CREATE_OPEN_BACKUP_INTENT;
696
697 oparms.tcon = tcon;
698 oparms.cifs_sb = cifs_sb;
699 oparms.desired_access = GENERIC_WRITE;
700 oparms.create_options = create_options;
701 oparms.disposition = FILE_CREATE;
702 oparms.path = full_path;
703 oparms.fid = &fid;
704 oparms.reconnect = false;
705
706 if (tcon->ses->server->oplocks)
707 oplock = REQ_OPLOCK;
708 else
709 oplock = 0;
710 rc = tcon->ses->server->ops->open(xid, &oparms, &oplock, buf);
711 if (rc)
712 goto mknod_out;
713
714 /*
715 * BB Do not bother to decode buf since no local inode yet to put
716 * timestamps in, but we can reuse it safely.
717 */
718
719 pdev = (struct win_dev *)buf;
720 io_parms.pid = current->tgid;
721 io_parms.tcon = tcon;
722 io_parms.offset = 0;
723 io_parms.length = sizeof(struct win_dev);
724 iov[1].iov_base = buf;
725 iov[1].iov_len = sizeof(struct win_dev);
726 if (S_ISCHR(mode)) {
727 memcpy(pdev->type, "IntxCHR", 8);
728 pdev->major = cpu_to_le64(MAJOR(device_number));
729 pdev->minor = cpu_to_le64(MINOR(device_number));
730 rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms,
731 &bytes_written, iov, 1);
732 } else if (S_ISBLK(mode)) {
733 memcpy(pdev->type, "IntxBLK", 8);
734 pdev->major = cpu_to_le64(MAJOR(device_number));
735 pdev->minor = cpu_to_le64(MINOR(device_number));
736 rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms,
737 &bytes_written, iov, 1);
738 } /* else if (S_ISFIFO) */
739 tcon->ses->server->ops->close(xid, tcon, &fid);
740 d_drop(direntry);
741
742 /* FIXME: add code here to set EAs */
743
744 mknod_out:
745 kfree(full_path);
746 kfree(buf);
747 free_xid(xid);
748 cifs_put_tlink(tlink);
749 return rc;
750 }
751
752 struct dentry *
753 cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
754 unsigned int flags)
755 {
756 unsigned int xid;
757 int rc = 0; /* to get around spurious gcc warning, set to zero here */
758 struct cifs_sb_info *cifs_sb;
759 struct tcon_link *tlink;
760 struct cifs_tcon *pTcon;
761 struct inode *newInode = NULL;
762 char *full_path = NULL;
763
764 xid = get_xid();
765
766 cifs_dbg(FYI, "parent inode = 0x%p name is: %pd and dentry = 0x%p\n",
767 parent_dir_inode, direntry, direntry);
768
769 /* check whether path exists */
770
771 cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
772 tlink = cifs_sb_tlink(cifs_sb);
773 if (IS_ERR(tlink)) {
774 free_xid(xid);
775 return (struct dentry *)tlink;
776 }
777 pTcon = tlink_tcon(tlink);
778
779 rc = check_name(direntry);
780 if (rc)
781 goto lookup_out;
782
783 /* can not grab the rename sem here since it would
784 deadlock in the cases (beginning of sys_rename itself)
785 in which we already have the sb rename sem */
786 full_path = build_path_from_dentry(direntry);
787 if (full_path == NULL) {
788 rc = -ENOMEM;
789 goto lookup_out;
790 }
791
792 if (d_really_is_positive(direntry)) {
793 cifs_dbg(FYI, "non-NULL inode in lookup\n");
794 } else {
795 cifs_dbg(FYI, "NULL inode in lookup\n");
796 }
797 cifs_dbg(FYI, "Full path: %s inode = 0x%p\n",
798 full_path, d_inode(direntry));
799
800 if (pTcon->unix_ext) {
801 rc = cifs_get_inode_info_unix(&newInode, full_path,
802 parent_dir_inode->i_sb, xid);
803 } else {
804 rc = cifs_get_inode_info(&newInode, full_path, NULL,
805 parent_dir_inode->i_sb, xid, NULL);
806 }
807
808 if ((rc == 0) && (newInode != NULL)) {
809 d_add(direntry, newInode);
810 /* since paths are not looked up by component - the parent
811 directories are presumed to be good here */
812 renew_parental_timestamps(direntry);
813
814 } else if (rc == -ENOENT) {
815 rc = 0;
816 cifs_set_time(direntry, jiffies);
817 d_add(direntry, NULL);
818 /* if it was once a directory (but how can we tell?) we could do
819 shrink_dcache_parent(direntry); */
820 } else if (rc != -EACCES) {
821 cifs_dbg(FYI, "Unexpected lookup error %d\n", rc);
822 /* We special case check for Access Denied - since that
823 is a common return code */
824 }
825
826 lookup_out:
827 kfree(full_path);
828 cifs_put_tlink(tlink);
829 free_xid(xid);
830 return ERR_PTR(rc);
831 }
832
833 static int
834 cifs_d_revalidate(struct dentry *direntry, unsigned int flags)
835 {
836 if (flags & LOOKUP_RCU)
837 return -ECHILD;
838
839 if (d_really_is_positive(direntry)) {
840 if (cifs_revalidate_dentry(direntry))
841 return 0;
842 else {
843 /*
844 * If the inode wasn't known to be a dfs entry when
845 * the dentry was instantiated, such as when created
846 * via ->readdir(), it needs to be set now since the
847 * attributes will have been updated by
848 * cifs_revalidate_dentry().
849 */
850 if (IS_AUTOMOUNT(d_inode(direntry)) &&
851 !(direntry->d_flags & DCACHE_NEED_AUTOMOUNT)) {
852 spin_lock(&direntry->d_lock);
853 direntry->d_flags |= DCACHE_NEED_AUTOMOUNT;
854 spin_unlock(&direntry->d_lock);
855 }
856
857 return 1;
858 }
859 }
860
861 /*
862 * This may be nfsd (or something), anyway, we can't see the
863 * intent of this. So, since this can be for creation, drop it.
864 */
865 if (!flags)
866 return 0;
867
868 /*
869 * Drop the negative dentry, in order to make sure to use the
870 * case sensitive name which is specified by user if this is
871 * for creation.
872 */
873 if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
874 return 0;
875
876 if (time_after(jiffies, cifs_get_time(direntry) + HZ) || !lookupCacheEnabled)
877 return 0;
878
879 return 1;
880 }
881
882 /* static int cifs_d_delete(struct dentry *direntry)
883 {
884 int rc = 0;
885
886 cifs_dbg(FYI, "In cifs d_delete, name = %pd\n", direntry);
887
888 return rc;
889 } */
890
891 const struct dentry_operations cifs_dentry_ops = {
892 .d_revalidate = cifs_d_revalidate,
893 .d_automount = cifs_dfs_d_automount,
894 /* d_delete: cifs_d_delete, */ /* not needed except for debugging */
895 };
896
897 static int cifs_ci_hash(const struct dentry *dentry, struct qstr *q)
898 {
899 struct nls_table *codepage = CIFS_SB(dentry->d_sb)->local_nls;
900 unsigned long hash;
901 wchar_t c;
902 int i, charlen;
903
904 hash = init_name_hash(dentry);
905 for (i = 0; i < q->len; i += charlen) {
906 charlen = codepage->char2uni(&q->name[i], q->len - i, &c);
907 /* error out if we can't convert the character */
908 if (unlikely(charlen < 0))
909 return charlen;
910 hash = partial_name_hash(cifs_toupper(c), hash);
911 }
912 q->hash = end_name_hash(hash);
913
914 return 0;
915 }
916
917 static int cifs_ci_compare(const struct dentry *dentry,
918 unsigned int len, const char *str, const struct qstr *name)
919 {
920 struct nls_table *codepage = CIFS_SB(dentry->d_sb)->local_nls;
921 wchar_t c1, c2;
922 int i, l1, l2;
923
924 /*
925 * We make the assumption here that uppercase characters in the local
926 * codepage are always the same length as their lowercase counterparts.
927 *
928 * If that's ever not the case, then this will fail to match it.
929 */
930 if (name->len != len)
931 return 1;
932
933 for (i = 0; i < len; i += l1) {
934 /* Convert characters in both strings to UTF-16. */
935 l1 = codepage->char2uni(&str[i], len - i, &c1);
936 l2 = codepage->char2uni(&name->name[i], name->len - i, &c2);
937
938 /*
939 * If we can't convert either character, just declare it to
940 * be 1 byte long and compare the original byte.
941 */
942 if (unlikely(l1 < 0 && l2 < 0)) {
943 if (str[i] != name->name[i])
944 return 1;
945 l1 = 1;
946 continue;
947 }
948
949 /*
950 * Here, we again ass|u|me that upper/lowercase versions of
951 * a character are the same length in the local NLS.
952 */
953 if (l1 != l2)
954 return 1;
955
956 /* Now compare uppercase versions of these characters */
957 if (cifs_toupper(c1) != cifs_toupper(c2))
958 return 1;
959 }
960
961 return 0;
962 }
963
964 const struct dentry_operations cifs_ci_dentry_ops = {
965 .d_revalidate = cifs_d_revalidate,
966 .d_hash = cifs_ci_hash,
967 .d_compare = cifs_ci_compare,
968 .d_automount = cifs_dfs_d_automount,
969 };
970
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