Loading...
Note: File does not exist in v6.13.7.
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
37static void
38renew_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 direntry->d_time = jiffies;
44 direntry = direntry->d_parent;
45 } while (!IS_ROOT(direntry));
46}
47
48char *
49cifs_build_path_to_root(struct smb_vol *vol, struct cifs_sb_info *cifs_sb,
50 struct cifs_tcon *tcon)
51{
52 int pplen = vol->prepath ? strlen(vol->prepath) + 1 : 0;
53 int dfsplen;
54 char *full_path = NULL;
55
56 /* 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 (tcon->Flags & SMB_SHARE_IS_IN_DFS)
63 dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1);
64 else
65 dfsplen = 0;
66
67 full_path = kmalloc(dfsplen + pplen + 1, GFP_KERNEL);
68 if (full_path == NULL)
69 return full_path;
70
71 if (dfsplen)
72 strncpy(full_path, tcon->treeName, dfsplen);
73 full_path[dfsplen] = CIFS_DIR_SEP(cifs_sb);
74 strncpy(full_path + dfsplen + 1, vol->prepath, pplen);
75 convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
76 full_path[dfsplen + pplen] = 0; /* add trailing null */
77 return full_path;
78}
79
80/* Note: caller must free return buffer */
81char *
82build_path_from_dentry(struct dentry *direntry)
83{
84 struct dentry *temp;
85 int namelen;
86 int dfsplen;
87 char *full_path;
88 char dirsep;
89 struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
90 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
91 unsigned seq;
92
93 dirsep = CIFS_DIR_SEP(cifs_sb);
94 if (tcon->Flags & SMB_SHARE_IS_IN_DFS)
95 dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1);
96 else
97 dfsplen = 0;
98cifs_bp_rename_retry:
99 namelen = dfsplen;
100 seq = read_seqbegin(&rename_lock);
101 rcu_read_lock();
102 for (temp = direntry; !IS_ROOT(temp);) {
103 namelen += (1 + temp->d_name.len);
104 temp = temp->d_parent;
105 if (temp == NULL) {
106 cifs_dbg(VFS, "corrupt dentry\n");
107 rcu_read_unlock();
108 return NULL;
109 }
110 }
111 rcu_read_unlock();
112
113 full_path = kmalloc(namelen+1, GFP_KERNEL);
114 if (full_path == NULL)
115 return full_path;
116 full_path[namelen] = 0; /* trailing null */
117 rcu_read_lock();
118 for (temp = direntry; !IS_ROOT(temp);) {
119 spin_lock(&temp->d_lock);
120 namelen -= 1 + temp->d_name.len;
121 if (namelen < 0) {
122 spin_unlock(&temp->d_lock);
123 break;
124 } else {
125 full_path[namelen] = dirsep;
126 strncpy(full_path + namelen + 1, temp->d_name.name,
127 temp->d_name.len);
128 cifs_dbg(FYI, "name: %s\n", full_path + namelen);
129 }
130 spin_unlock(&temp->d_lock);
131 temp = temp->d_parent;
132 if (temp == NULL) {
133 cifs_dbg(VFS, "corrupt dentry\n");
134 rcu_read_unlock();
135 kfree(full_path);
136 return NULL;
137 }
138 }
139 rcu_read_unlock();
140 if (namelen != dfsplen || read_seqretry(&rename_lock, seq)) {
141 cifs_dbg(FYI, "did not end path lookup where expected. namelen=%ddfsplen=%d\n",
142 namelen, dfsplen);
143 /* presumably this is only possible if racing with a rename
144 of one of the parent directories (we can not lock the dentries
145 above us to prevent this, but retrying should be harmless) */
146 kfree(full_path);
147 goto cifs_bp_rename_retry;
148 }
149 /* DIR_SEP already set for byte 0 / vs \ but not for
150 subsequent slashes in prepath which currently must
151 be entered the right way - not sure if there is an alternative
152 since the '\' is a valid posix character so we can not switch
153 those safely to '/' if any are found in the middle of the prepath */
154 /* BB test paths to Windows with '/' in the midst of prepath */
155
156 if (dfsplen) {
157 strncpy(full_path, tcon->treeName, dfsplen);
158 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
159 int i;
160 for (i = 0; i < dfsplen; i++) {
161 if (full_path[i] == '\\')
162 full_path[i] = '/';
163 }
164 }
165 }
166 return full_path;
167}
168
169/*
170 * Don't allow the separator character in a path component.
171 * The VFS will not allow "/", but "\" is allowed by posix.
172 */
173static int
174check_name(struct dentry *direntry)
175{
176 struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
177 int i;
178
179 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)) {
180 for (i = 0; i < direntry->d_name.len; i++) {
181 if (direntry->d_name.name[i] == '\\') {
182 cifs_dbg(FYI, "Invalid file name\n");
183 return -EINVAL;
184 }
185 }
186 }
187 return 0;
188}
189
190
191/* Inode operations in similar order to how they appear in Linux file fs.h */
192
193static int
194cifs_do_create(struct inode *inode, struct dentry *direntry, unsigned int xid,
195 struct tcon_link *tlink, unsigned oflags, umode_t mode,
196 __u32 *oplock, struct cifs_fid *fid)
197{
198 int rc = -ENOENT;
199 int create_options = CREATE_NOT_DIR;
200 int desired_access;
201 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
202 struct cifs_tcon *tcon = tlink_tcon(tlink);
203 char *full_path = NULL;
204 FILE_ALL_INFO *buf = NULL;
205 struct inode *newinode = NULL;
206 int disposition;
207 struct TCP_Server_Info *server = tcon->ses->server;
208 struct cifs_open_parms oparms;
209
210 *oplock = 0;
211 if (tcon->ses->server->oplocks)
212 *oplock = REQ_OPLOCK;
213
214 full_path = build_path_from_dentry(direntry);
215 if (full_path == NULL) {
216 rc = -ENOMEM;
217 goto out;
218 }
219
220 if (tcon->unix_ext && cap_unix(tcon->ses) && !tcon->broken_posix_open &&
221 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
222 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
223 rc = cifs_posix_open(full_path, &newinode, inode->i_sb, mode,
224 oflags, oplock, &fid->netfid, xid);
225 switch (rc) {
226 case 0:
227 if (newinode == NULL) {
228 /* query inode info */
229 goto cifs_create_get_file_info;
230 }
231
232 if (!S_ISREG(newinode->i_mode)) {
233 /*
234 * The server may allow us to open things like
235 * FIFOs, but the client isn't set up to deal
236 * with that. If it's not a regular file, just
237 * close it and proceed as if it were a normal
238 * lookup.
239 */
240 CIFSSMBClose(xid, tcon, fid->netfid);
241 goto cifs_create_get_file_info;
242 }
243 /* success, no need to query */
244 goto cifs_create_set_dentry;
245
246 case -ENOENT:
247 goto cifs_create_get_file_info;
248
249 case -EIO:
250 case -EINVAL:
251 /*
252 * EIO could indicate that (posix open) operation is not
253 * supported, despite what server claimed in capability
254 * negotiation.
255 *
256 * POSIX open in samba versions 3.3.1 and earlier could
257 * incorrectly fail with invalid parameter.
258 */
259 tcon->broken_posix_open = true;
260 break;
261
262 case -EREMOTE:
263 case -EOPNOTSUPP:
264 /*
265 * EREMOTE indicates DFS junction, which is not handled
266 * in posix open. If either that or op not supported
267 * returned, follow the normal lookup.
268 */
269 break;
270
271 default:
272 goto out;
273 }
274 /*
275 * fallthrough to retry, using older open call, this is case
276 * where server does not support this SMB level, and falsely
277 * claims capability (also get here for DFS case which should be
278 * rare for path not covered on files)
279 */
280 }
281
282 desired_access = 0;
283 if (OPEN_FMODE(oflags) & FMODE_READ)
284 desired_access |= GENERIC_READ; /* is this too little? */
285 if (OPEN_FMODE(oflags) & FMODE_WRITE)
286 desired_access |= GENERIC_WRITE;
287
288 disposition = FILE_OVERWRITE_IF;
289 if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
290 disposition = FILE_CREATE;
291 else if ((oflags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
292 disposition = FILE_OVERWRITE_IF;
293 else if ((oflags & O_CREAT) == O_CREAT)
294 disposition = FILE_OPEN_IF;
295 else
296 cifs_dbg(FYI, "Create flag not set in create function\n");
297
298 /*
299 * BB add processing to set equivalent of mode - e.g. via CreateX with
300 * ACLs
301 */
302
303 if (!server->ops->open) {
304 rc = -ENOSYS;
305 goto out;
306 }
307
308 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
309 if (buf == NULL) {
310 rc = -ENOMEM;
311 goto out;
312 }
313
314 /*
315 * if we're not using unix extensions, see if we need to set
316 * ATTR_READONLY on the create call
317 */
318 if (!tcon->unix_ext && (mode & S_IWUGO) == 0)
319 create_options |= CREATE_OPTION_READONLY;
320
321 if (backup_cred(cifs_sb))
322 create_options |= CREATE_OPEN_BACKUP_INTENT;
323
324 oparms.tcon = tcon;
325 oparms.cifs_sb = cifs_sb;
326 oparms.desired_access = desired_access;
327 oparms.create_options = create_options;
328 oparms.disposition = disposition;
329 oparms.path = full_path;
330 oparms.fid = fid;
331 oparms.reconnect = false;
332
333 rc = server->ops->open(xid, &oparms, oplock, buf);
334 if (rc) {
335 cifs_dbg(FYI, "cifs_create returned 0x%x\n", rc);
336 goto out;
337 }
338
339 /*
340 * If Open reported that we actually created a file then we now have to
341 * set the mode if possible.
342 */
343 if ((tcon->unix_ext) && (*oplock & CIFS_CREATE_ACTION)) {
344 struct cifs_unix_set_info_args args = {
345 .mode = mode,
346 .ctime = NO_CHANGE_64,
347 .atime = NO_CHANGE_64,
348 .mtime = NO_CHANGE_64,
349 .device = 0,
350 };
351
352 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
353 args.uid = current_fsuid();
354 if (inode->i_mode & S_ISGID)
355 args.gid = inode->i_gid;
356 else
357 args.gid = current_fsgid();
358 } else {
359 args.uid = INVALID_UID; /* no change */
360 args.gid = INVALID_GID; /* no change */
361 }
362 CIFSSMBUnixSetFileInfo(xid, tcon, &args, fid->netfid,
363 current->tgid);
364 } else {
365 /*
366 * BB implement mode setting via Windows security
367 * descriptors e.g.
368 */
369 /* CIFSSMBWinSetPerms(xid,tcon,path,mode,-1,-1,nls);*/
370
371 /* Could set r/o dos attribute if mode & 0222 == 0 */
372 }
373
374cifs_create_get_file_info:
375 /* server might mask mode so we have to query for it */
376 if (tcon->unix_ext)
377 rc = cifs_get_inode_info_unix(&newinode, full_path, inode->i_sb,
378 xid);
379 else {
380 rc = cifs_get_inode_info(&newinode, full_path, buf, inode->i_sb,
381 xid, fid);
382 if (newinode) {
383 if (server->ops->set_lease_key)
384 server->ops->set_lease_key(newinode, fid);
385 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
386 newinode->i_mode = mode;
387 if ((*oplock & CIFS_CREATE_ACTION) &&
388 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)) {
389 newinode->i_uid = current_fsuid();
390 if (inode->i_mode & S_ISGID)
391 newinode->i_gid = inode->i_gid;
392 else
393 newinode->i_gid = current_fsgid();
394 }
395 }
396 }
397
398cifs_create_set_dentry:
399 if (rc != 0) {
400 cifs_dbg(FYI, "Create worked, get_inode_info failed rc = %d\n",
401 rc);
402 if (server->ops->close)
403 server->ops->close(xid, tcon, fid);
404 goto out;
405 }
406 d_drop(direntry);
407 d_add(direntry, newinode);
408
409out:
410 kfree(buf);
411 kfree(full_path);
412 return rc;
413}
414
415int
416cifs_atomic_open(struct inode *inode, struct dentry *direntry,
417 struct file *file, unsigned oflags, umode_t mode,
418 int *opened)
419{
420 int rc;
421 unsigned int xid;
422 struct tcon_link *tlink;
423 struct cifs_tcon *tcon;
424 struct TCP_Server_Info *server;
425 struct cifs_fid fid;
426 struct cifs_pending_open open;
427 __u32 oplock;
428 struct cifsFileInfo *file_info;
429
430 /*
431 * Posix open is only called (at lookup time) for file create now. For
432 * opens (rather than creates), because we do not know if it is a file
433 * or directory yet, and current Samba no longer allows us to do posix
434 * open on dirs, we could end up wasting an open call on what turns out
435 * to be a dir. For file opens, we wait to call posix open till
436 * cifs_open. It could be added to atomic_open in the future but the
437 * performance tradeoff of the extra network request when EISDIR or
438 * EACCES is returned would have to be weighed against the 50% reduction
439 * in network traffic in the other paths.
440 */
441 if (!(oflags & O_CREAT)) {
442 struct dentry *res;
443
444 /*
445 * Check for hashed negative dentry. We have already revalidated
446 * the dentry and it is fine. No need to perform another lookup.
447 */
448 if (!d_unhashed(direntry))
449 return -ENOENT;
450
451 res = cifs_lookup(inode, direntry, 0);
452 if (IS_ERR(res))
453 return PTR_ERR(res);
454
455 return finish_no_open(file, res);
456 }
457
458 rc = check_name(direntry);
459 if (rc)
460 return rc;
461
462 xid = get_xid();
463
464 cifs_dbg(FYI, "parent inode = 0x%p name is: %pd and dentry = 0x%p\n",
465 inode, direntry, direntry);
466
467 tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb));
468 if (IS_ERR(tlink)) {
469 rc = PTR_ERR(tlink);
470 goto out_free_xid;
471 }
472
473 tcon = tlink_tcon(tlink);
474 server = tcon->ses->server;
475
476 if (server->ops->new_lease_key)
477 server->ops->new_lease_key(&fid);
478
479 cifs_add_pending_open(&fid, tlink, &open);
480
481 rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode,
482 &oplock, &fid);
483
484 if (rc) {
485 cifs_del_pending_open(&open);
486 goto out;
487 }
488
489 if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
490 *opened |= FILE_CREATED;
491
492 rc = finish_open(file, direntry, generic_file_open, opened);
493 if (rc) {
494 if (server->ops->close)
495 server->ops->close(xid, tcon, &fid);
496 cifs_del_pending_open(&open);
497 goto out;
498 }
499
500 if (file->f_flags & O_DIRECT &&
501 CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) {
502 if (CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
503 file->f_op = &cifs_file_direct_nobrl_ops;
504 else
505 file->f_op = &cifs_file_direct_ops;
506 }
507
508 file_info = cifs_new_fileinfo(&fid, file, tlink, oplock);
509 if (file_info == NULL) {
510 if (server->ops->close)
511 server->ops->close(xid, tcon, &fid);
512 cifs_del_pending_open(&open);
513 fput(file);
514 rc = -ENOMEM;
515 }
516
517out:
518 cifs_put_tlink(tlink);
519out_free_xid:
520 free_xid(xid);
521 return rc;
522}
523
524int cifs_create(struct inode *inode, struct dentry *direntry, umode_t mode,
525 bool excl)
526{
527 int rc;
528 unsigned int xid = get_xid();
529 /*
530 * BB below access is probably too much for mknod to request
531 * but we have to do query and setpathinfo so requesting
532 * less could fail (unless we want to request getatr and setatr
533 * permissions (only). At least for POSIX we do not have to
534 * request so much.
535 */
536 unsigned oflags = O_EXCL | O_CREAT | O_RDWR;
537 struct tcon_link *tlink;
538 struct cifs_tcon *tcon;
539 struct TCP_Server_Info *server;
540 struct cifs_fid fid;
541 __u32 oplock;
542
543 cifs_dbg(FYI, "cifs_create parent inode = 0x%p name is: %pd and dentry = 0x%p\n",
544 inode, direntry, direntry);
545
546 tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb));
547 rc = PTR_ERR(tlink);
548 if (IS_ERR(tlink))
549 goto out_free_xid;
550
551 tcon = tlink_tcon(tlink);
552 server = tcon->ses->server;
553
554 if (server->ops->new_lease_key)
555 server->ops->new_lease_key(&fid);
556
557 rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode,
558 &oplock, &fid);
559 if (!rc && server->ops->close)
560 server->ops->close(xid, tcon, &fid);
561
562 cifs_put_tlink(tlink);
563out_free_xid:
564 free_xid(xid);
565 return rc;
566}
567
568int cifs_mknod(struct inode *inode, struct dentry *direntry, umode_t mode,
569 dev_t device_number)
570{
571 int rc = -EPERM;
572 unsigned int xid;
573 int create_options = CREATE_NOT_DIR | CREATE_OPTION_SPECIAL;
574 struct cifs_sb_info *cifs_sb;
575 struct tcon_link *tlink;
576 struct cifs_tcon *tcon;
577 struct cifs_io_parms io_parms;
578 char *full_path = NULL;
579 struct inode *newinode = NULL;
580 __u32 oplock = 0;
581 struct cifs_fid fid;
582 struct cifs_open_parms oparms;
583 FILE_ALL_INFO *buf = NULL;
584 unsigned int bytes_written;
585 struct win_dev *pdev;
586 struct kvec iov[2];
587
588 if (!old_valid_dev(device_number))
589 return -EINVAL;
590
591 cifs_sb = CIFS_SB(inode->i_sb);
592 tlink = cifs_sb_tlink(cifs_sb);
593 if (IS_ERR(tlink))
594 return PTR_ERR(tlink);
595
596 tcon = tlink_tcon(tlink);
597
598 xid = get_xid();
599
600 full_path = build_path_from_dentry(direntry);
601 if (full_path == NULL) {
602 rc = -ENOMEM;
603 goto mknod_out;
604 }
605
606 if (tcon->unix_ext) {
607 struct cifs_unix_set_info_args args = {
608 .mode = mode & ~current_umask(),
609 .ctime = NO_CHANGE_64,
610 .atime = NO_CHANGE_64,
611 .mtime = NO_CHANGE_64,
612 .device = device_number,
613 };
614 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
615 args.uid = current_fsuid();
616 args.gid = current_fsgid();
617 } else {
618 args.uid = INVALID_UID; /* no change */
619 args.gid = INVALID_GID; /* no change */
620 }
621 rc = CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args,
622 cifs_sb->local_nls,
623 cifs_remap(cifs_sb));
624 if (rc)
625 goto mknod_out;
626
627 rc = cifs_get_inode_info_unix(&newinode, full_path,
628 inode->i_sb, xid);
629
630 if (rc == 0)
631 d_instantiate(direntry, newinode);
632 goto mknod_out;
633 }
634
635 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL))
636 goto mknod_out;
637
638
639 cifs_dbg(FYI, "sfu compat create special file\n");
640
641 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
642 if (buf == NULL) {
643 kfree(full_path);
644 rc = -ENOMEM;
645 free_xid(xid);
646 return rc;
647 }
648
649 if (backup_cred(cifs_sb))
650 create_options |= CREATE_OPEN_BACKUP_INTENT;
651
652 oparms.tcon = tcon;
653 oparms.cifs_sb = cifs_sb;
654 oparms.desired_access = GENERIC_WRITE;
655 oparms.create_options = create_options;
656 oparms.disposition = FILE_CREATE;
657 oparms.path = full_path;
658 oparms.fid = &fid;
659 oparms.reconnect = false;
660
661 if (tcon->ses->server->oplocks)
662 oplock = REQ_OPLOCK;
663 else
664 oplock = 0;
665 rc = tcon->ses->server->ops->open(xid, &oparms, &oplock, buf);
666 if (rc)
667 goto mknod_out;
668
669 /*
670 * BB Do not bother to decode buf since no local inode yet to put
671 * timestamps in, but we can reuse it safely.
672 */
673
674 pdev = (struct win_dev *)buf;
675 io_parms.pid = current->tgid;
676 io_parms.tcon = tcon;
677 io_parms.offset = 0;
678 io_parms.length = sizeof(struct win_dev);
679 iov[1].iov_base = buf;
680 iov[1].iov_len = sizeof(struct win_dev);
681 if (S_ISCHR(mode)) {
682 memcpy(pdev->type, "IntxCHR", 8);
683 pdev->major = cpu_to_le64(MAJOR(device_number));
684 pdev->minor = cpu_to_le64(MINOR(device_number));
685 rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms,
686 &bytes_written, iov, 1);
687 } else if (S_ISBLK(mode)) {
688 memcpy(pdev->type, "IntxBLK", 8);
689 pdev->major = cpu_to_le64(MAJOR(device_number));
690 pdev->minor = cpu_to_le64(MINOR(device_number));
691 rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms,
692 &bytes_written, iov, 1);
693 } /* else if (S_ISFIFO) */
694 tcon->ses->server->ops->close(xid, tcon, &fid);
695 d_drop(direntry);
696
697 /* FIXME: add code here to set EAs */
698
699mknod_out:
700 kfree(full_path);
701 kfree(buf);
702 free_xid(xid);
703 cifs_put_tlink(tlink);
704 return rc;
705}
706
707struct dentry *
708cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
709 unsigned int flags)
710{
711 unsigned int xid;
712 int rc = 0; /* to get around spurious gcc warning, set to zero here */
713 struct cifs_sb_info *cifs_sb;
714 struct tcon_link *tlink;
715 struct cifs_tcon *pTcon;
716 struct inode *newInode = NULL;
717 char *full_path = NULL;
718
719 xid = get_xid();
720
721 cifs_dbg(FYI, "parent inode = 0x%p name is: %pd and dentry = 0x%p\n",
722 parent_dir_inode, direntry, direntry);
723
724 /* check whether path exists */
725
726 cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
727 tlink = cifs_sb_tlink(cifs_sb);
728 if (IS_ERR(tlink)) {
729 free_xid(xid);
730 return (struct dentry *)tlink;
731 }
732 pTcon = tlink_tcon(tlink);
733
734 rc = check_name(direntry);
735 if (rc)
736 goto lookup_out;
737
738 /* can not grab the rename sem here since it would
739 deadlock in the cases (beginning of sys_rename itself)
740 in which we already have the sb rename sem */
741 full_path = build_path_from_dentry(direntry);
742 if (full_path == NULL) {
743 rc = -ENOMEM;
744 goto lookup_out;
745 }
746
747 if (d_really_is_positive(direntry)) {
748 cifs_dbg(FYI, "non-NULL inode in lookup\n");
749 } else {
750 cifs_dbg(FYI, "NULL inode in lookup\n");
751 }
752 cifs_dbg(FYI, "Full path: %s inode = 0x%p\n",
753 full_path, d_inode(direntry));
754
755 if (pTcon->unix_ext) {
756 rc = cifs_get_inode_info_unix(&newInode, full_path,
757 parent_dir_inode->i_sb, xid);
758 } else {
759 rc = cifs_get_inode_info(&newInode, full_path, NULL,
760 parent_dir_inode->i_sb, xid, NULL);
761 }
762
763 if ((rc == 0) && (newInode != NULL)) {
764 d_add(direntry, newInode);
765 /* since paths are not looked up by component - the parent
766 directories are presumed to be good here */
767 renew_parental_timestamps(direntry);
768
769 } else if (rc == -ENOENT) {
770 rc = 0;
771 direntry->d_time = jiffies;
772 d_add(direntry, NULL);
773 /* if it was once a directory (but how can we tell?) we could do
774 shrink_dcache_parent(direntry); */
775 } else if (rc != -EACCES) {
776 cifs_dbg(FYI, "Unexpected lookup error %d\n", rc);
777 /* We special case check for Access Denied - since that
778 is a common return code */
779 }
780
781lookup_out:
782 kfree(full_path);
783 cifs_put_tlink(tlink);
784 free_xid(xid);
785 return ERR_PTR(rc);
786}
787
788static int
789cifs_d_revalidate(struct dentry *direntry, unsigned int flags)
790{
791 if (flags & LOOKUP_RCU)
792 return -ECHILD;
793
794 if (d_really_is_positive(direntry)) {
795 if (cifs_revalidate_dentry(direntry))
796 return 0;
797 else {
798 /*
799 * If the inode wasn't known to be a dfs entry when
800 * the dentry was instantiated, such as when created
801 * via ->readdir(), it needs to be set now since the
802 * attributes will have been updated by
803 * cifs_revalidate_dentry().
804 */
805 if (IS_AUTOMOUNT(d_inode(direntry)) &&
806 !(direntry->d_flags & DCACHE_NEED_AUTOMOUNT)) {
807 spin_lock(&direntry->d_lock);
808 direntry->d_flags |= DCACHE_NEED_AUTOMOUNT;
809 spin_unlock(&direntry->d_lock);
810 }
811
812 return 1;
813 }
814 }
815
816 /*
817 * This may be nfsd (or something), anyway, we can't see the
818 * intent of this. So, since this can be for creation, drop it.
819 */
820 if (!flags)
821 return 0;
822
823 /*
824 * Drop the negative dentry, in order to make sure to use the
825 * case sensitive name which is specified by user if this is
826 * for creation.
827 */
828 if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
829 return 0;
830
831 if (time_after(jiffies, direntry->d_time + HZ) || !lookupCacheEnabled)
832 return 0;
833
834 return 1;
835}
836
837/* static int cifs_d_delete(struct dentry *direntry)
838{
839 int rc = 0;
840
841 cifs_dbg(FYI, "In cifs d_delete, name = %pd\n", direntry);
842
843 return rc;
844} */
845
846const struct dentry_operations cifs_dentry_ops = {
847 .d_revalidate = cifs_d_revalidate,
848 .d_automount = cifs_dfs_d_automount,
849/* d_delete: cifs_d_delete, */ /* not needed except for debugging */
850};
851
852static int cifs_ci_hash(const struct dentry *dentry, struct qstr *q)
853{
854 struct nls_table *codepage = CIFS_SB(dentry->d_sb)->local_nls;
855 unsigned long hash;
856 wchar_t c;
857 int i, charlen;
858
859 hash = init_name_hash();
860 for (i = 0; i < q->len; i += charlen) {
861 charlen = codepage->char2uni(&q->name[i], q->len - i, &c);
862 /* error out if we can't convert the character */
863 if (unlikely(charlen < 0))
864 return charlen;
865 hash = partial_name_hash(cifs_toupper(c), hash);
866 }
867 q->hash = end_name_hash(hash);
868
869 return 0;
870}
871
872static int cifs_ci_compare(const struct dentry *parent, const struct dentry *dentry,
873 unsigned int len, const char *str, const struct qstr *name)
874{
875 struct nls_table *codepage = CIFS_SB(parent->d_sb)->local_nls;
876 wchar_t c1, c2;
877 int i, l1, l2;
878
879 /*
880 * We make the assumption here that uppercase characters in the local
881 * codepage are always the same length as their lowercase counterparts.
882 *
883 * If that's ever not the case, then this will fail to match it.
884 */
885 if (name->len != len)
886 return 1;
887
888 for (i = 0; i < len; i += l1) {
889 /* Convert characters in both strings to UTF-16. */
890 l1 = codepage->char2uni(&str[i], len - i, &c1);
891 l2 = codepage->char2uni(&name->name[i], name->len - i, &c2);
892
893 /*
894 * If we can't convert either character, just declare it to
895 * be 1 byte long and compare the original byte.
896 */
897 if (unlikely(l1 < 0 && l2 < 0)) {
898 if (str[i] != name->name[i])
899 return 1;
900 l1 = 1;
901 continue;
902 }
903
904 /*
905 * Here, we again ass|u|me that upper/lowercase versions of
906 * a character are the same length in the local NLS.
907 */
908 if (l1 != l2)
909 return 1;
910
911 /* Now compare uppercase versions of these characters */
912 if (cifs_toupper(c1) != cifs_toupper(c2))
913 return 1;
914 }
915
916 return 0;
917}
918
919const struct dentry_operations cifs_ci_dentry_ops = {
920 .d_revalidate = cifs_d_revalidate,
921 .d_hash = cifs_ci_hash,
922 .d_compare = cifs_ci_compare,
923 .d_automount = cifs_dfs_d_automount,
924};