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1/*
2 * fs/cifs/dir.c
3 *
4 * vfs operations that deal with dentries
5 *
6 * Copyright (C) International Business Machines Corp., 2002,2009
7 * Author(s): Steve French (sfrench@us.ibm.com)
8 *
9 * This library is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU Lesser General Public License as published
11 * by the Free Software Foundation; either version 2.1 of the License, or
12 * (at your option) any later version.
13 *
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
17 * the GNU Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public License
20 * along with this library; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 */
23#include <linux/fs.h>
24#include <linux/stat.h>
25#include <linux/slab.h>
26#include <linux/namei.h>
27#include <linux/mount.h>
28#include <linux/file.h>
29#include "cifsfs.h"
30#include "cifspdu.h"
31#include "cifsglob.h"
32#include "cifsproto.h"
33#include "cifs_debug.h"
34#include "cifs_fs_sb.h"
35#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};
1// SPDX-License-Identifier: LGPL-2.1
2/*
3 * fs/cifs/dir.c
4 *
5 * vfs operations that deal with dentries
6 *
7 * Copyright (C) International Business Machines Corp., 2002,2009
8 * Author(s): Steve French (sfrench@us.ibm.com)
9 *
10 */
11#include <linux/fs.h>
12#include <linux/stat.h>
13#include <linux/slab.h>
14#include <linux/namei.h>
15#include <linux/mount.h>
16#include <linux/file.h>
17#include "cifsfs.h"
18#include "cifspdu.h"
19#include "cifsglob.h"
20#include "cifsproto.h"
21#include "cifs_debug.h"
22#include "cifs_fs_sb.h"
23#include "cifs_unicode.h"
24#include "fs_context.h"
25#include "cifs_ioctl.h"
26
27static void
28renew_parental_timestamps(struct dentry *direntry)
29{
30 /* BB check if there is a way to get the kernel to do this or if we
31 really need this */
32 do {
33 cifs_set_time(direntry, jiffies);
34 direntry = direntry->d_parent;
35 } while (!IS_ROOT(direntry));
36}
37
38char *
39cifs_build_path_to_root(struct smb3_fs_context *ctx, struct cifs_sb_info *cifs_sb,
40 struct cifs_tcon *tcon, int add_treename)
41{
42 int pplen = ctx->prepath ? strlen(ctx->prepath) + 1 : 0;
43 int dfsplen;
44 char *full_path = NULL;
45
46 /* if no prefix path, simply set path to the root of share to "" */
47 if (pplen == 0) {
48 full_path = kzalloc(1, GFP_KERNEL);
49 return full_path;
50 }
51
52 if (add_treename)
53 dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1);
54 else
55 dfsplen = 0;
56
57 full_path = kmalloc(dfsplen + pplen + 1, GFP_KERNEL);
58 if (full_path == NULL)
59 return full_path;
60
61 if (dfsplen)
62 memcpy(full_path, tcon->treeName, dfsplen);
63 full_path[dfsplen] = CIFS_DIR_SEP(cifs_sb);
64 memcpy(full_path + dfsplen + 1, ctx->prepath, pplen);
65 convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
66 return full_path;
67}
68
69/* Note: caller must free return buffer */
70const char *
71build_path_from_dentry(struct dentry *direntry, void *page)
72{
73 struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
74 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
75 bool prefix = tcon->Flags & SMB_SHARE_IS_IN_DFS;
76
77 return build_path_from_dentry_optional_prefix(direntry, page,
78 prefix);
79}
80
81char *
82build_path_from_dentry_optional_prefix(struct dentry *direntry, void *page,
83 bool prefix)
84{
85 int dfsplen;
86 int pplen = 0;
87 struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
88 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
89 char dirsep = CIFS_DIR_SEP(cifs_sb);
90 char *s;
91
92 if (unlikely(!page))
93 return ERR_PTR(-ENOMEM);
94
95 if (prefix)
96 dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1);
97 else
98 dfsplen = 0;
99
100 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
101 pplen = cifs_sb->prepath ? strlen(cifs_sb->prepath) + 1 : 0;
102
103 s = dentry_path_raw(direntry, page, PATH_MAX);
104 if (IS_ERR(s))
105 return s;
106 if (!s[1]) // for root we want "", not "/"
107 s++;
108 if (s < (char *)page + pplen + dfsplen)
109 return ERR_PTR(-ENAMETOOLONG);
110 if (pplen) {
111 cifs_dbg(FYI, "using cifs_sb prepath <%s>\n", cifs_sb->prepath);
112 s -= pplen;
113 memcpy(s + 1, cifs_sb->prepath, pplen - 1);
114 *s = '/';
115 }
116 if (dirsep != '/') {
117 /* BB test paths to Windows with '/' in the midst of prepath */
118 char *p;
119
120 for (p = s; *p; p++)
121 if (*p == '/')
122 *p = dirsep;
123 }
124 if (dfsplen) {
125 s -= dfsplen;
126 memcpy(s, tcon->treeName, dfsplen);
127 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
128 int i;
129 for (i = 0; i < dfsplen; i++) {
130 if (s[i] == '\\')
131 s[i] = '/';
132 }
133 }
134 }
135 return s;
136}
137
138/*
139 * Don't allow path components longer than the server max.
140 * Don't allow the separator character in a path component.
141 * The VFS will not allow "/", but "\" is allowed by posix.
142 */
143static int
144check_name(struct dentry *direntry, struct cifs_tcon *tcon)
145{
146 struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
147 int i;
148
149 if (unlikely(tcon->fsAttrInfo.MaxPathNameComponentLength &&
150 direntry->d_name.len >
151 le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength)))
152 return -ENAMETOOLONG;
153
154 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)) {
155 for (i = 0; i < direntry->d_name.len; i++) {
156 if (direntry->d_name.name[i] == '\\') {
157 cifs_dbg(FYI, "Invalid file name\n");
158 return -EINVAL;
159 }
160 }
161 }
162 return 0;
163}
164
165
166/* Inode operations in similar order to how they appear in Linux file fs.h */
167
168static int
169cifs_do_create(struct inode *inode, struct dentry *direntry, unsigned int xid,
170 struct tcon_link *tlink, unsigned oflags, umode_t mode,
171 __u32 *oplock, struct cifs_fid *fid)
172{
173 int rc = -ENOENT;
174 int create_options = CREATE_NOT_DIR;
175 int desired_access;
176 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
177 struct cifs_tcon *tcon = tlink_tcon(tlink);
178 const char *full_path;
179 void *page = alloc_dentry_path();
180 FILE_ALL_INFO *buf = NULL;
181 struct inode *newinode = NULL;
182 int disposition;
183 struct TCP_Server_Info *server = tcon->ses->server;
184 struct cifs_open_parms oparms;
185
186 *oplock = 0;
187 if (tcon->ses->server->oplocks)
188 *oplock = REQ_OPLOCK;
189
190 full_path = build_path_from_dentry(direntry, page);
191 if (IS_ERR(full_path)) {
192 free_dentry_path(page);
193 return PTR_ERR(full_path);
194 }
195
196 if (tcon->unix_ext && cap_unix(tcon->ses) && !tcon->broken_posix_open &&
197 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
198 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
199 rc = cifs_posix_open(full_path, &newinode, inode->i_sb, mode,
200 oflags, oplock, &fid->netfid, xid);
201 switch (rc) {
202 case 0:
203 if (newinode == NULL) {
204 /* query inode info */
205 goto cifs_create_get_file_info;
206 }
207
208 if (S_ISDIR(newinode->i_mode)) {
209 CIFSSMBClose(xid, tcon, fid->netfid);
210 iput(newinode);
211 rc = -EISDIR;
212 goto out;
213 }
214
215 if (!S_ISREG(newinode->i_mode)) {
216 /*
217 * The server may allow us to open things like
218 * FIFOs, but the client isn't set up to deal
219 * with that. If it's not a regular file, just
220 * close it and proceed as if it were a normal
221 * lookup.
222 */
223 CIFSSMBClose(xid, tcon, fid->netfid);
224 goto cifs_create_get_file_info;
225 }
226 /* success, no need to query */
227 goto cifs_create_set_dentry;
228
229 case -ENOENT:
230 goto cifs_create_get_file_info;
231
232 case -EIO:
233 case -EINVAL:
234 /*
235 * EIO could indicate that (posix open) operation is not
236 * supported, despite what server claimed in capability
237 * negotiation.
238 *
239 * POSIX open in samba versions 3.3.1 and earlier could
240 * incorrectly fail with invalid parameter.
241 */
242 tcon->broken_posix_open = true;
243 break;
244
245 case -EREMOTE:
246 case -EOPNOTSUPP:
247 /*
248 * EREMOTE indicates DFS junction, which is not handled
249 * in posix open. If either that or op not supported
250 * returned, follow the normal lookup.
251 */
252 break;
253
254 default:
255 goto out;
256 }
257 /*
258 * fallthrough to retry, using older open call, this is case
259 * where server does not support this SMB level, and falsely
260 * claims capability (also get here for DFS case which should be
261 * rare for path not covered on files)
262 */
263 }
264
265 desired_access = 0;
266 if (OPEN_FMODE(oflags) & FMODE_READ)
267 desired_access |= GENERIC_READ; /* is this too little? */
268 if (OPEN_FMODE(oflags) & FMODE_WRITE)
269 desired_access |= GENERIC_WRITE;
270
271 disposition = FILE_OVERWRITE_IF;
272 if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
273 disposition = FILE_CREATE;
274 else if ((oflags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
275 disposition = FILE_OVERWRITE_IF;
276 else if ((oflags & O_CREAT) == O_CREAT)
277 disposition = FILE_OPEN_IF;
278 else
279 cifs_dbg(FYI, "Create flag not set in create function\n");
280
281 /*
282 * BB add processing to set equivalent of mode - e.g. via CreateX with
283 * ACLs
284 */
285
286 if (!server->ops->open) {
287 rc = -ENOSYS;
288 goto out;
289 }
290
291 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
292 if (buf == NULL) {
293 rc = -ENOMEM;
294 goto out;
295 }
296
297 /*
298 * if we're not using unix extensions, see if we need to set
299 * ATTR_READONLY on the create call
300 */
301 if (!tcon->unix_ext && (mode & S_IWUGO) == 0)
302 create_options |= CREATE_OPTION_READONLY;
303
304 oparms.tcon = tcon;
305 oparms.cifs_sb = cifs_sb;
306 oparms.desired_access = desired_access;
307 oparms.create_options = cifs_create_options(cifs_sb, create_options);
308 oparms.disposition = disposition;
309 oparms.path = full_path;
310 oparms.fid = fid;
311 oparms.reconnect = false;
312 oparms.mode = mode;
313 rc = server->ops->open(xid, &oparms, oplock, buf);
314 if (rc) {
315 cifs_dbg(FYI, "cifs_create returned 0x%x\n", rc);
316 goto out;
317 }
318
319 /*
320 * If Open reported that we actually created a file then we now have to
321 * set the mode if possible.
322 */
323 if ((tcon->unix_ext) && (*oplock & CIFS_CREATE_ACTION)) {
324 struct cifs_unix_set_info_args args = {
325 .mode = mode,
326 .ctime = NO_CHANGE_64,
327 .atime = NO_CHANGE_64,
328 .mtime = NO_CHANGE_64,
329 .device = 0,
330 };
331
332 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
333 args.uid = current_fsuid();
334 if (inode->i_mode & S_ISGID)
335 args.gid = inode->i_gid;
336 else
337 args.gid = current_fsgid();
338 } else {
339 args.uid = INVALID_UID; /* no change */
340 args.gid = INVALID_GID; /* no change */
341 }
342 CIFSSMBUnixSetFileInfo(xid, tcon, &args, fid->netfid,
343 current->tgid);
344 } else {
345 /*
346 * BB implement mode setting via Windows security
347 * descriptors e.g.
348 */
349 /* CIFSSMBWinSetPerms(xid,tcon,path,mode,-1,-1,nls);*/
350
351 /* Could set r/o dos attribute if mode & 0222 == 0 */
352 }
353
354cifs_create_get_file_info:
355 /* server might mask mode so we have to query for it */
356 if (tcon->unix_ext)
357 rc = cifs_get_inode_info_unix(&newinode, full_path, inode->i_sb,
358 xid);
359 else {
360 /* TODO: Add support for calling POSIX query info here, but passing in fid */
361 rc = cifs_get_inode_info(&newinode, full_path, buf, inode->i_sb,
362 xid, fid);
363 if (newinode) {
364 if (server->ops->set_lease_key)
365 server->ops->set_lease_key(newinode, fid);
366 if ((*oplock & CIFS_CREATE_ACTION) && S_ISREG(newinode->i_mode)) {
367 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
368 newinode->i_mode = mode;
369 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
370 newinode->i_uid = current_fsuid();
371 if (inode->i_mode & S_ISGID)
372 newinode->i_gid = inode->i_gid;
373 else
374 newinode->i_gid = current_fsgid();
375 }
376 }
377 }
378 }
379
380cifs_create_set_dentry:
381 if (rc != 0) {
382 cifs_dbg(FYI, "Create worked, get_inode_info failed rc = %d\n",
383 rc);
384 goto out_err;
385 }
386
387 if (newinode)
388 if (S_ISDIR(newinode->i_mode)) {
389 rc = -EISDIR;
390 goto out_err;
391 }
392
393 d_drop(direntry);
394 d_add(direntry, newinode);
395
396out:
397 kfree(buf);
398 free_dentry_path(page);
399 return rc;
400
401out_err:
402 if (server->ops->close)
403 server->ops->close(xid, tcon, fid);
404 if (newinode)
405 iput(newinode);
406 goto out;
407}
408
409int
410cifs_atomic_open(struct inode *inode, struct dentry *direntry,
411 struct file *file, unsigned oflags, umode_t mode)
412{
413 int rc;
414 unsigned int xid;
415 struct tcon_link *tlink;
416 struct cifs_tcon *tcon;
417 struct TCP_Server_Info *server;
418 struct cifs_fid fid;
419 struct cifs_pending_open open;
420 __u32 oplock;
421 struct cifsFileInfo *file_info;
422
423 if (unlikely(cifs_forced_shutdown(CIFS_SB(inode->i_sb))))
424 return -EIO;
425
426 /*
427 * Posix open is only called (at lookup time) for file create now. For
428 * opens (rather than creates), because we do not know if it is a file
429 * or directory yet, and current Samba no longer allows us to do posix
430 * open on dirs, we could end up wasting an open call on what turns out
431 * to be a dir. For file opens, we wait to call posix open till
432 * cifs_open. It could be added to atomic_open in the future but the
433 * performance tradeoff of the extra network request when EISDIR or
434 * EACCES is returned would have to be weighed against the 50% reduction
435 * in network traffic in the other paths.
436 */
437 if (!(oflags & O_CREAT)) {
438 struct dentry *res;
439
440 /*
441 * Check for hashed negative dentry. We have already revalidated
442 * the dentry and it is fine. No need to perform another lookup.
443 */
444 if (!d_in_lookup(direntry))
445 return -ENOENT;
446
447 res = cifs_lookup(inode, direntry, 0);
448 if (IS_ERR(res))
449 return PTR_ERR(res);
450
451 return finish_no_open(file, res);
452 }
453
454 xid = get_xid();
455
456 cifs_dbg(FYI, "parent inode = 0x%p name is: %pd and dentry = 0x%p\n",
457 inode, direntry, direntry);
458
459 tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb));
460 if (IS_ERR(tlink)) {
461 rc = PTR_ERR(tlink);
462 goto out_free_xid;
463 }
464
465 tcon = tlink_tcon(tlink);
466
467 rc = check_name(direntry, tcon);
468 if (rc)
469 goto out;
470
471 server = tcon->ses->server;
472
473 if (server->ops->new_lease_key)
474 server->ops->new_lease_key(&fid);
475
476 cifs_add_pending_open(&fid, tlink, &open);
477
478 rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode,
479 &oplock, &fid);
480
481 if (rc) {
482 cifs_del_pending_open(&open);
483 goto out;
484 }
485
486 if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
487 file->f_mode |= FMODE_CREATED;
488
489 rc = finish_open(file, direntry, generic_file_open);
490 if (rc) {
491 if (server->ops->close)
492 server->ops->close(xid, tcon, &fid);
493 cifs_del_pending_open(&open);
494 goto out;
495 }
496
497 if (file->f_flags & O_DIRECT &&
498 CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) {
499 if (CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
500 file->f_op = &cifs_file_direct_nobrl_ops;
501 else
502 file->f_op = &cifs_file_direct_ops;
503 }
504
505 file_info = cifs_new_fileinfo(&fid, file, tlink, oplock);
506 if (file_info == NULL) {
507 if (server->ops->close)
508 server->ops->close(xid, tcon, &fid);
509 cifs_del_pending_open(&open);
510 rc = -ENOMEM;
511 }
512
513out:
514 cifs_put_tlink(tlink);
515out_free_xid:
516 free_xid(xid);
517 return rc;
518}
519
520int cifs_create(struct user_namespace *mnt_userns, struct inode *inode,
521 struct dentry *direntry, umode_t mode, bool excl)
522{
523 int rc;
524 unsigned int xid = get_xid();
525 /*
526 * BB below access is probably too much for mknod to request
527 * but we have to do query and setpathinfo so requesting
528 * less could fail (unless we want to request getatr and setatr
529 * permissions (only). At least for POSIX we do not have to
530 * request so much.
531 */
532 unsigned oflags = O_EXCL | O_CREAT | O_RDWR;
533 struct tcon_link *tlink;
534 struct cifs_tcon *tcon;
535 struct TCP_Server_Info *server;
536 struct cifs_fid fid;
537 __u32 oplock;
538
539 cifs_dbg(FYI, "cifs_create parent inode = 0x%p name is: %pd and dentry = 0x%p\n",
540 inode, direntry, direntry);
541
542 if (unlikely(cifs_forced_shutdown(CIFS_SB(inode->i_sb))))
543 return -EIO;
544
545 tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb));
546 rc = PTR_ERR(tlink);
547 if (IS_ERR(tlink))
548 goto out_free_xid;
549
550 tcon = tlink_tcon(tlink);
551 server = tcon->ses->server;
552
553 if (server->ops->new_lease_key)
554 server->ops->new_lease_key(&fid);
555
556 rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode,
557 &oplock, &fid);
558 if (!rc && server->ops->close)
559 server->ops->close(xid, tcon, &fid);
560
561 cifs_put_tlink(tlink);
562out_free_xid:
563 free_xid(xid);
564 return rc;
565}
566
567int cifs_mknod(struct user_namespace *mnt_userns, struct inode *inode,
568 struct dentry *direntry, umode_t mode, dev_t device_number)
569{
570 int rc = -EPERM;
571 unsigned int xid;
572 struct cifs_sb_info *cifs_sb;
573 struct tcon_link *tlink;
574 struct cifs_tcon *tcon;
575 const char *full_path;
576 void *page;
577
578 if (!old_valid_dev(device_number))
579 return -EINVAL;
580
581 cifs_sb = CIFS_SB(inode->i_sb);
582 if (unlikely(cifs_forced_shutdown(cifs_sb)))
583 return -EIO;
584
585 tlink = cifs_sb_tlink(cifs_sb);
586 if (IS_ERR(tlink))
587 return PTR_ERR(tlink);
588
589 page = alloc_dentry_path();
590 tcon = tlink_tcon(tlink);
591 xid = get_xid();
592
593 full_path = build_path_from_dentry(direntry, page);
594 if (IS_ERR(full_path)) {
595 rc = PTR_ERR(full_path);
596 goto mknod_out;
597 }
598
599 rc = tcon->ses->server->ops->make_node(xid, inode, direntry, tcon,
600 full_path, mode,
601 device_number);
602
603mknod_out:
604 free_dentry_path(page);
605 free_xid(xid);
606 cifs_put_tlink(tlink);
607 return rc;
608}
609
610struct dentry *
611cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
612 unsigned int flags)
613{
614 unsigned int xid;
615 int rc = 0; /* to get around spurious gcc warning, set to zero here */
616 struct cifs_sb_info *cifs_sb;
617 struct tcon_link *tlink;
618 struct cifs_tcon *pTcon;
619 struct inode *newInode = NULL;
620 const char *full_path;
621 void *page;
622 int retry_count = 0;
623
624 xid = get_xid();
625
626 cifs_dbg(FYI, "parent inode = 0x%p name is: %pd and dentry = 0x%p\n",
627 parent_dir_inode, direntry, direntry);
628
629 /* check whether path exists */
630
631 cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
632 tlink = cifs_sb_tlink(cifs_sb);
633 if (IS_ERR(tlink)) {
634 free_xid(xid);
635 return ERR_CAST(tlink);
636 }
637 pTcon = tlink_tcon(tlink);
638
639 rc = check_name(direntry, pTcon);
640 if (unlikely(rc)) {
641 cifs_put_tlink(tlink);
642 free_xid(xid);
643 return ERR_PTR(rc);
644 }
645
646 /* can not grab the rename sem here since it would
647 deadlock in the cases (beginning of sys_rename itself)
648 in which we already have the sb rename sem */
649 page = alloc_dentry_path();
650 full_path = build_path_from_dentry(direntry, page);
651 if (IS_ERR(full_path)) {
652 cifs_put_tlink(tlink);
653 free_xid(xid);
654 free_dentry_path(page);
655 return ERR_CAST(full_path);
656 }
657
658 if (d_really_is_positive(direntry)) {
659 cifs_dbg(FYI, "non-NULL inode in lookup\n");
660 } else {
661 cifs_dbg(FYI, "NULL inode in lookup\n");
662 }
663 cifs_dbg(FYI, "Full path: %s inode = 0x%p\n",
664 full_path, d_inode(direntry));
665
666again:
667 if (pTcon->posix_extensions)
668 rc = smb311_posix_get_inode_info(&newInode, full_path, parent_dir_inode->i_sb, xid);
669 else if (pTcon->unix_ext) {
670 rc = cifs_get_inode_info_unix(&newInode, full_path,
671 parent_dir_inode->i_sb, xid);
672 } else {
673 rc = cifs_get_inode_info(&newInode, full_path, NULL,
674 parent_dir_inode->i_sb, xid, NULL);
675 }
676
677 if (rc == 0) {
678 /* since paths are not looked up by component - the parent
679 directories are presumed to be good here */
680 renew_parental_timestamps(direntry);
681 } else if (rc == -EAGAIN && retry_count++ < 10) {
682 goto again;
683 } else if (rc == -ENOENT) {
684 cifs_set_time(direntry, jiffies);
685 newInode = NULL;
686 } else {
687 if (rc != -EACCES) {
688 cifs_dbg(FYI, "Unexpected lookup error %d\n", rc);
689 /* We special case check for Access Denied - since that
690 is a common return code */
691 }
692 newInode = ERR_PTR(rc);
693 }
694 free_dentry_path(page);
695 cifs_put_tlink(tlink);
696 free_xid(xid);
697 return d_splice_alias(newInode, direntry);
698}
699
700static int
701cifs_d_revalidate(struct dentry *direntry, unsigned int flags)
702{
703 struct inode *inode;
704 int rc;
705
706 if (flags & LOOKUP_RCU)
707 return -ECHILD;
708
709 if (d_really_is_positive(direntry)) {
710 inode = d_inode(direntry);
711 if ((flags & LOOKUP_REVAL) && !CIFS_CACHE_READ(CIFS_I(inode)))
712 CIFS_I(inode)->time = 0; /* force reval */
713
714 rc = cifs_revalidate_dentry(direntry);
715 if (rc) {
716 cifs_dbg(FYI, "cifs_revalidate_dentry failed with rc=%d", rc);
717 switch (rc) {
718 case -ENOENT:
719 case -ESTALE:
720 /*
721 * Those errors mean the dentry is invalid
722 * (file was deleted or recreated)
723 */
724 return 0;
725 default:
726 /*
727 * Otherwise some unexpected error happened
728 * report it as-is to VFS layer
729 */
730 return rc;
731 }
732 }
733 else {
734 /*
735 * If the inode wasn't known to be a dfs entry when
736 * the dentry was instantiated, such as when created
737 * via ->readdir(), it needs to be set now since the
738 * attributes will have been updated by
739 * cifs_revalidate_dentry().
740 */
741 if (IS_AUTOMOUNT(inode) &&
742 !(direntry->d_flags & DCACHE_NEED_AUTOMOUNT)) {
743 spin_lock(&direntry->d_lock);
744 direntry->d_flags |= DCACHE_NEED_AUTOMOUNT;
745 spin_unlock(&direntry->d_lock);
746 }
747
748 return 1;
749 }
750 }
751
752 /*
753 * This may be nfsd (or something), anyway, we can't see the
754 * intent of this. So, since this can be for creation, drop it.
755 */
756 if (!flags)
757 return 0;
758
759 /*
760 * Drop the negative dentry, in order to make sure to use the
761 * case sensitive name which is specified by user if this is
762 * for creation.
763 */
764 if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
765 return 0;
766
767 if (time_after(jiffies, cifs_get_time(direntry) + HZ) || !lookupCacheEnabled)
768 return 0;
769
770 return 1;
771}
772
773/* static int cifs_d_delete(struct dentry *direntry)
774{
775 int rc = 0;
776
777 cifs_dbg(FYI, "In cifs d_delete, name = %pd\n", direntry);
778
779 return rc;
780} */
781
782const struct dentry_operations cifs_dentry_ops = {
783 .d_revalidate = cifs_d_revalidate,
784 .d_automount = cifs_dfs_d_automount,
785/* d_delete: cifs_d_delete, */ /* not needed except for debugging */
786};
787
788static int cifs_ci_hash(const struct dentry *dentry, struct qstr *q)
789{
790 struct nls_table *codepage = CIFS_SB(dentry->d_sb)->local_nls;
791 unsigned long hash;
792 wchar_t c;
793 int i, charlen;
794
795 hash = init_name_hash(dentry);
796 for (i = 0; i < q->len; i += charlen) {
797 charlen = codepage->char2uni(&q->name[i], q->len - i, &c);
798 /* error out if we can't convert the character */
799 if (unlikely(charlen < 0))
800 return charlen;
801 hash = partial_name_hash(cifs_toupper(c), hash);
802 }
803 q->hash = end_name_hash(hash);
804
805 return 0;
806}
807
808static int cifs_ci_compare(const struct dentry *dentry,
809 unsigned int len, const char *str, const struct qstr *name)
810{
811 struct nls_table *codepage = CIFS_SB(dentry->d_sb)->local_nls;
812 wchar_t c1, c2;
813 int i, l1, l2;
814
815 /*
816 * We make the assumption here that uppercase characters in the local
817 * codepage are always the same length as their lowercase counterparts.
818 *
819 * If that's ever not the case, then this will fail to match it.
820 */
821 if (name->len != len)
822 return 1;
823
824 for (i = 0; i < len; i += l1) {
825 /* Convert characters in both strings to UTF-16. */
826 l1 = codepage->char2uni(&str[i], len - i, &c1);
827 l2 = codepage->char2uni(&name->name[i], name->len - i, &c2);
828
829 /*
830 * If we can't convert either character, just declare it to
831 * be 1 byte long and compare the original byte.
832 */
833 if (unlikely(l1 < 0 && l2 < 0)) {
834 if (str[i] != name->name[i])
835 return 1;
836 l1 = 1;
837 continue;
838 }
839
840 /*
841 * Here, we again ass|u|me that upper/lowercase versions of
842 * a character are the same length in the local NLS.
843 */
844 if (l1 != l2)
845 return 1;
846
847 /* Now compare uppercase versions of these characters */
848 if (cifs_toupper(c1) != cifs_toupper(c2))
849 return 1;
850 }
851
852 return 0;
853}
854
855const struct dentry_operations cifs_ci_dentry_ops = {
856 .d_revalidate = cifs_d_revalidate,
857 .d_hash = cifs_ci_hash,
858 .d_compare = cifs_ci_compare,
859 .d_automount = cifs_dfs_d_automount,
860};