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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
36static void
37renew_parental_timestamps(struct dentry *direntry)
38{
39 /* BB check if there is a way to get the kernel to do this or if we
40 really need this */
41 do {
42 direntry->d_time = jiffies;
43 direntry = direntry->d_parent;
44 } while (!IS_ROOT(direntry));
45}
46
47/* Note: caller must free return buffer */
48char *
49build_path_from_dentry(struct dentry *direntry)
50{
51 struct dentry *temp;
52 int namelen;
53 int dfsplen;
54 char *full_path;
55 char dirsep;
56 struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
57 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
58 unsigned seq;
59
60 dirsep = CIFS_DIR_SEP(cifs_sb);
61 if (tcon->Flags & SMB_SHARE_IS_IN_DFS)
62 dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1);
63 else
64 dfsplen = 0;
65cifs_bp_rename_retry:
66 namelen = dfsplen;
67 seq = read_seqbegin(&rename_lock);
68 rcu_read_lock();
69 for (temp = direntry; !IS_ROOT(temp);) {
70 namelen += (1 + temp->d_name.len);
71 temp = temp->d_parent;
72 if (temp == NULL) {
73 cERROR(1, "corrupt dentry");
74 rcu_read_unlock();
75 return NULL;
76 }
77 }
78 rcu_read_unlock();
79
80 full_path = kmalloc(namelen+1, GFP_KERNEL);
81 if (full_path == NULL)
82 return full_path;
83 full_path[namelen] = 0; /* trailing null */
84 rcu_read_lock();
85 for (temp = direntry; !IS_ROOT(temp);) {
86 spin_lock(&temp->d_lock);
87 namelen -= 1 + temp->d_name.len;
88 if (namelen < 0) {
89 spin_unlock(&temp->d_lock);
90 break;
91 } else {
92 full_path[namelen] = dirsep;
93 strncpy(full_path + namelen + 1, temp->d_name.name,
94 temp->d_name.len);
95 cFYI(0, "name: %s", full_path + namelen);
96 }
97 spin_unlock(&temp->d_lock);
98 temp = temp->d_parent;
99 if (temp == NULL) {
100 cERROR(1, "corrupt dentry");
101 rcu_read_unlock();
102 kfree(full_path);
103 return NULL;
104 }
105 }
106 rcu_read_unlock();
107 if (namelen != dfsplen || read_seqretry(&rename_lock, seq)) {
108 cFYI(1, "did not end path lookup where expected. namelen=%d "
109 "dfsplen=%d", namelen, dfsplen);
110 /* presumably this is only possible if racing with a rename
111 of one of the parent directories (we can not lock the dentries
112 above us to prevent this, but retrying should be harmless) */
113 kfree(full_path);
114 goto cifs_bp_rename_retry;
115 }
116 /* DIR_SEP already set for byte 0 / vs \ but not for
117 subsequent slashes in prepath which currently must
118 be entered the right way - not sure if there is an alternative
119 since the '\' is a valid posix character so we can not switch
120 those safely to '/' if any are found in the middle of the prepath */
121 /* BB test paths to Windows with '/' in the midst of prepath */
122
123 if (dfsplen) {
124 strncpy(full_path, tcon->treeName, dfsplen);
125 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
126 int i;
127 for (i = 0; i < dfsplen; i++) {
128 if (full_path[i] == '\\')
129 full_path[i] = '/';
130 }
131 }
132 }
133 return full_path;
134}
135
136/* Inode operations in similar order to how they appear in Linux file fs.h */
137
138int
139cifs_create(struct inode *inode, struct dentry *direntry, umode_t mode,
140 struct nameidata *nd)
141{
142 int rc = -ENOENT;
143 int xid;
144 int create_options = CREATE_NOT_DIR;
145 __u32 oplock = 0;
146 int oflags;
147 /*
148 * BB below access is probably too much for mknod to request
149 * but we have to do query and setpathinfo so requesting
150 * less could fail (unless we want to request getatr and setatr
151 * permissions (only). At least for POSIX we do not have to
152 * request so much.
153 */
154 int desiredAccess = GENERIC_READ | GENERIC_WRITE;
155 __u16 fileHandle;
156 struct cifs_sb_info *cifs_sb;
157 struct tcon_link *tlink;
158 struct cifs_tcon *tcon;
159 char *full_path = NULL;
160 FILE_ALL_INFO *buf = NULL;
161 struct inode *newinode = NULL;
162 int disposition = FILE_OVERWRITE_IF;
163
164 xid = GetXid();
165
166 cifs_sb = CIFS_SB(inode->i_sb);
167 tlink = cifs_sb_tlink(cifs_sb);
168 if (IS_ERR(tlink)) {
169 FreeXid(xid);
170 return PTR_ERR(tlink);
171 }
172 tcon = tlink_tcon(tlink);
173
174 if (tcon->ses->server->oplocks)
175 oplock = REQ_OPLOCK;
176
177 if (nd)
178 oflags = nd->intent.open.file->f_flags;
179 else
180 oflags = O_RDONLY | O_CREAT;
181
182 full_path = build_path_from_dentry(direntry);
183 if (full_path == NULL) {
184 rc = -ENOMEM;
185 goto cifs_create_out;
186 }
187
188 if (tcon->unix_ext && (tcon->ses->capabilities & CAP_UNIX) &&
189 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
190 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
191 rc = cifs_posix_open(full_path, &newinode,
192 inode->i_sb, mode, oflags, &oplock, &fileHandle, xid);
193 /* EIO could indicate that (posix open) operation is not
194 supported, despite what server claimed in capability
195 negotiation. EREMOTE indicates DFS junction, which is not
196 handled in posix open */
197
198 if (rc == 0) {
199 if (newinode == NULL) /* query inode info */
200 goto cifs_create_get_file_info;
201 else /* success, no need to query */
202 goto cifs_create_set_dentry;
203 } else if ((rc != -EIO) && (rc != -EREMOTE) &&
204 (rc != -EOPNOTSUPP) && (rc != -EINVAL))
205 goto cifs_create_out;
206 /* else fallthrough to retry, using older open call, this is
207 case where server does not support this SMB level, and
208 falsely claims capability (also get here for DFS case
209 which should be rare for path not covered on files) */
210 }
211
212 if (nd) {
213 /* if the file is going to stay open, then we
214 need to set the desired access properly */
215 desiredAccess = 0;
216 if (OPEN_FMODE(oflags) & FMODE_READ)
217 desiredAccess |= GENERIC_READ; /* is this too little? */
218 if (OPEN_FMODE(oflags) & FMODE_WRITE)
219 desiredAccess |= GENERIC_WRITE;
220
221 if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
222 disposition = FILE_CREATE;
223 else if ((oflags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
224 disposition = FILE_OVERWRITE_IF;
225 else if ((oflags & O_CREAT) == O_CREAT)
226 disposition = FILE_OPEN_IF;
227 else
228 cFYI(1, "Create flag not set in create function");
229 }
230
231 /* BB add processing to set equivalent of mode - e.g. via CreateX with
232 ACLs */
233
234 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
235 if (buf == NULL) {
236 rc = -ENOMEM;
237 goto cifs_create_out;
238 }
239
240 /*
241 * if we're not using unix extensions, see if we need to set
242 * ATTR_READONLY on the create call
243 */
244 if (!tcon->unix_ext && (mode & S_IWUGO) == 0)
245 create_options |= CREATE_OPTION_READONLY;
246
247 if (backup_cred(cifs_sb))
248 create_options |= CREATE_OPEN_BACKUP_INTENT;
249
250 if (tcon->ses->capabilities & CAP_NT_SMBS)
251 rc = CIFSSMBOpen(xid, tcon, full_path, disposition,
252 desiredAccess, create_options,
253 &fileHandle, &oplock, buf, cifs_sb->local_nls,
254 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
255 else
256 rc = -EIO; /* no NT SMB support fall into legacy open below */
257
258 if (rc == -EIO) {
259 /* old server, retry the open legacy style */
260 rc = SMBLegacyOpen(xid, tcon, full_path, disposition,
261 desiredAccess, create_options,
262 &fileHandle, &oplock, buf, cifs_sb->local_nls,
263 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
264 }
265 if (rc) {
266 cFYI(1, "cifs_create returned 0x%x", rc);
267 goto cifs_create_out;
268 }
269
270 /* If Open reported that we actually created a file
271 then we now have to set the mode if possible */
272 if ((tcon->unix_ext) && (oplock & CIFS_CREATE_ACTION)) {
273 struct cifs_unix_set_info_args args = {
274 .mode = mode,
275 .ctime = NO_CHANGE_64,
276 .atime = NO_CHANGE_64,
277 .mtime = NO_CHANGE_64,
278 .device = 0,
279 };
280
281 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
282 args.uid = (__u64) current_fsuid();
283 if (inode->i_mode & S_ISGID)
284 args.gid = (__u64) inode->i_gid;
285 else
286 args.gid = (__u64) current_fsgid();
287 } else {
288 args.uid = NO_CHANGE_64;
289 args.gid = NO_CHANGE_64;
290 }
291 CIFSSMBUnixSetFileInfo(xid, tcon, &args, fileHandle,
292 current->tgid);
293 } else {
294 /* BB implement mode setting via Windows security
295 descriptors e.g. */
296 /* CIFSSMBWinSetPerms(xid,tcon,path,mode,-1,-1,nls);*/
297
298 /* Could set r/o dos attribute if mode & 0222 == 0 */
299 }
300
301cifs_create_get_file_info:
302 /* server might mask mode so we have to query for it */
303 if (tcon->unix_ext)
304 rc = cifs_get_inode_info_unix(&newinode, full_path,
305 inode->i_sb, xid);
306 else {
307 rc = cifs_get_inode_info(&newinode, full_path, buf,
308 inode->i_sb, xid, &fileHandle);
309 if (newinode) {
310 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
311 newinode->i_mode = mode;
312 if ((oplock & CIFS_CREATE_ACTION) &&
313 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)) {
314 newinode->i_uid = current_fsuid();
315 if (inode->i_mode & S_ISGID)
316 newinode->i_gid = inode->i_gid;
317 else
318 newinode->i_gid = current_fsgid();
319 }
320 }
321 }
322
323cifs_create_set_dentry:
324 if (rc == 0)
325 d_instantiate(direntry, newinode);
326 else
327 cFYI(1, "Create worked, get_inode_info failed rc = %d", rc);
328
329 if (newinode && nd) {
330 struct cifsFileInfo *pfile_info;
331 struct file *filp;
332
333 filp = lookup_instantiate_filp(nd, direntry, generic_file_open);
334 if (IS_ERR(filp)) {
335 rc = PTR_ERR(filp);
336 CIFSSMBClose(xid, tcon, fileHandle);
337 goto cifs_create_out;
338 }
339
340 pfile_info = cifs_new_fileinfo(fileHandle, filp, tlink, oplock);
341 if (pfile_info == NULL) {
342 fput(filp);
343 CIFSSMBClose(xid, tcon, fileHandle);
344 rc = -ENOMEM;
345 }
346 } else {
347 CIFSSMBClose(xid, tcon, fileHandle);
348 }
349
350cifs_create_out:
351 kfree(buf);
352 kfree(full_path);
353 cifs_put_tlink(tlink);
354 FreeXid(xid);
355 return rc;
356}
357
358int cifs_mknod(struct inode *inode, struct dentry *direntry, umode_t mode,
359 dev_t device_number)
360{
361 int rc = -EPERM;
362 int xid;
363 int create_options = CREATE_NOT_DIR | CREATE_OPTION_SPECIAL;
364 struct cifs_sb_info *cifs_sb;
365 struct tcon_link *tlink;
366 struct cifs_tcon *pTcon;
367 struct cifs_io_parms io_parms;
368 char *full_path = NULL;
369 struct inode *newinode = NULL;
370 int oplock = 0;
371 u16 fileHandle;
372 FILE_ALL_INFO *buf = NULL;
373 unsigned int bytes_written;
374 struct win_dev *pdev;
375
376 if (!old_valid_dev(device_number))
377 return -EINVAL;
378
379 cifs_sb = CIFS_SB(inode->i_sb);
380 tlink = cifs_sb_tlink(cifs_sb);
381 if (IS_ERR(tlink))
382 return PTR_ERR(tlink);
383
384 pTcon = tlink_tcon(tlink);
385
386 xid = GetXid();
387
388 full_path = build_path_from_dentry(direntry);
389 if (full_path == NULL) {
390 rc = -ENOMEM;
391 goto mknod_out;
392 }
393
394 if (pTcon->unix_ext) {
395 struct cifs_unix_set_info_args args = {
396 .mode = mode & ~current_umask(),
397 .ctime = NO_CHANGE_64,
398 .atime = NO_CHANGE_64,
399 .mtime = NO_CHANGE_64,
400 .device = device_number,
401 };
402 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
403 args.uid = (__u64) current_fsuid();
404 args.gid = (__u64) current_fsgid();
405 } else {
406 args.uid = NO_CHANGE_64;
407 args.gid = NO_CHANGE_64;
408 }
409 rc = CIFSSMBUnixSetPathInfo(xid, pTcon, full_path, &args,
410 cifs_sb->local_nls,
411 cifs_sb->mnt_cifs_flags &
412 CIFS_MOUNT_MAP_SPECIAL_CHR);
413 if (rc)
414 goto mknod_out;
415
416 rc = cifs_get_inode_info_unix(&newinode, full_path,
417 inode->i_sb, xid);
418
419 if (rc == 0)
420 d_instantiate(direntry, newinode);
421 goto mknod_out;
422 }
423
424 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL))
425 goto mknod_out;
426
427
428 cFYI(1, "sfu compat create special file");
429
430 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
431 if (buf == NULL) {
432 kfree(full_path);
433 rc = -ENOMEM;
434 FreeXid(xid);
435 return rc;
436 }
437
438 if (backup_cred(cifs_sb))
439 create_options |= CREATE_OPEN_BACKUP_INTENT;
440
441 rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_CREATE,
442 GENERIC_WRITE, create_options,
443 &fileHandle, &oplock, buf, cifs_sb->local_nls,
444 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
445 if (rc)
446 goto mknod_out;
447
448 /* BB Do not bother to decode buf since no local inode yet to put
449 * timestamps in, but we can reuse it safely */
450
451 pdev = (struct win_dev *)buf;
452 io_parms.netfid = fileHandle;
453 io_parms.pid = current->tgid;
454 io_parms.tcon = pTcon;
455 io_parms.offset = 0;
456 io_parms.length = sizeof(struct win_dev);
457 if (S_ISCHR(mode)) {
458 memcpy(pdev->type, "IntxCHR", 8);
459 pdev->major =
460 cpu_to_le64(MAJOR(device_number));
461 pdev->minor =
462 cpu_to_le64(MINOR(device_number));
463 rc = CIFSSMBWrite(xid, &io_parms,
464 &bytes_written, (char *)pdev,
465 NULL, 0);
466 } else if (S_ISBLK(mode)) {
467 memcpy(pdev->type, "IntxBLK", 8);
468 pdev->major =
469 cpu_to_le64(MAJOR(device_number));
470 pdev->minor =
471 cpu_to_le64(MINOR(device_number));
472 rc = CIFSSMBWrite(xid, &io_parms,
473 &bytes_written, (char *)pdev,
474 NULL, 0);
475 } /* else if (S_ISFIFO) */
476 CIFSSMBClose(xid, pTcon, fileHandle);
477 d_drop(direntry);
478
479 /* FIXME: add code here to set EAs */
480
481mknod_out:
482 kfree(full_path);
483 kfree(buf);
484 FreeXid(xid);
485 cifs_put_tlink(tlink);
486 return rc;
487}
488
489struct dentry *
490cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
491 struct nameidata *nd)
492{
493 int xid;
494 int rc = 0; /* to get around spurious gcc warning, set to zero here */
495 __u32 oplock;
496 __u16 fileHandle = 0;
497 bool posix_open = false;
498 struct cifs_sb_info *cifs_sb;
499 struct tcon_link *tlink;
500 struct cifs_tcon *pTcon;
501 struct cifsFileInfo *cfile;
502 struct inode *newInode = NULL;
503 char *full_path = NULL;
504 struct file *filp;
505
506 xid = GetXid();
507
508 cFYI(1, "parent inode = 0x%p name is: %s and dentry = 0x%p",
509 parent_dir_inode, direntry->d_name.name, direntry);
510
511 /* check whether path exists */
512
513 cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
514 tlink = cifs_sb_tlink(cifs_sb);
515 if (IS_ERR(tlink)) {
516 FreeXid(xid);
517 return (struct dentry *)tlink;
518 }
519 pTcon = tlink_tcon(tlink);
520
521 oplock = pTcon->ses->server->oplocks ? REQ_OPLOCK : 0;
522
523 /*
524 * Don't allow the separator character in a path component.
525 * The VFS will not allow "/", but "\" is allowed by posix.
526 */
527 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)) {
528 int i;
529 for (i = 0; i < direntry->d_name.len; i++)
530 if (direntry->d_name.name[i] == '\\') {
531 cFYI(1, "Invalid file name");
532 rc = -EINVAL;
533 goto lookup_out;
534 }
535 }
536
537 /*
538 * O_EXCL: optimize away the lookup, but don't hash the dentry. Let
539 * the VFS handle the create.
540 */
541 if (nd && (nd->flags & LOOKUP_EXCL)) {
542 d_instantiate(direntry, NULL);
543 rc = 0;
544 goto lookup_out;
545 }
546
547 /* can not grab the rename sem here since it would
548 deadlock in the cases (beginning of sys_rename itself)
549 in which we already have the sb rename sem */
550 full_path = build_path_from_dentry(direntry);
551 if (full_path == NULL) {
552 rc = -ENOMEM;
553 goto lookup_out;
554 }
555
556 if (direntry->d_inode != NULL) {
557 cFYI(1, "non-NULL inode in lookup");
558 } else {
559 cFYI(1, "NULL inode in lookup");
560 }
561 cFYI(1, "Full path: %s inode = 0x%p", full_path, direntry->d_inode);
562
563 /* Posix open is only called (at lookup time) for file create now.
564 * For opens (rather than creates), because we do not know if it
565 * is a file or directory yet, and current Samba no longer allows
566 * us to do posix open on dirs, we could end up wasting an open call
567 * on what turns out to be a dir. For file opens, we wait to call posix
568 * open till cifs_open. It could be added here (lookup) in the future
569 * but the performance tradeoff of the extra network request when EISDIR
570 * or EACCES is returned would have to be weighed against the 50%
571 * reduction in network traffic in the other paths.
572 */
573 if (pTcon->unix_ext) {
574 if (nd && !(nd->flags & LOOKUP_DIRECTORY) &&
575 (nd->flags & LOOKUP_OPEN) && !pTcon->broken_posix_open &&
576 (nd->intent.open.file->f_flags & O_CREAT)) {
577 rc = cifs_posix_open(full_path, &newInode,
578 parent_dir_inode->i_sb,
579 nd->intent.open.create_mode,
580 nd->intent.open.file->f_flags, &oplock,
581 &fileHandle, xid);
582 /*
583 * The check below works around a bug in POSIX
584 * open in samba versions 3.3.1 and earlier where
585 * open could incorrectly fail with invalid parameter.
586 * If either that or op not supported returned, follow
587 * the normal lookup.
588 */
589 switch (rc) {
590 case 0:
591 /*
592 * The server may allow us to open things like
593 * FIFOs, but the client isn't set up to deal
594 * with that. If it's not a regular file, just
595 * close it and proceed as if it were a normal
596 * lookup.
597 */
598 if (newInode && !S_ISREG(newInode->i_mode)) {
599 CIFSSMBClose(xid, pTcon, fileHandle);
600 break;
601 }
602 case -ENOENT:
603 posix_open = true;
604 case -EOPNOTSUPP:
605 break;
606 default:
607 pTcon->broken_posix_open = true;
608 }
609 }
610 if (!posix_open)
611 rc = cifs_get_inode_info_unix(&newInode, full_path,
612 parent_dir_inode->i_sb, xid);
613 } else
614 rc = cifs_get_inode_info(&newInode, full_path, NULL,
615 parent_dir_inode->i_sb, xid, NULL);
616
617 if ((rc == 0) && (newInode != NULL)) {
618 d_add(direntry, newInode);
619 if (posix_open) {
620 filp = lookup_instantiate_filp(nd, direntry,
621 generic_file_open);
622 if (IS_ERR(filp)) {
623 rc = PTR_ERR(filp);
624 CIFSSMBClose(xid, pTcon, fileHandle);
625 goto lookup_out;
626 }
627
628 cfile = cifs_new_fileinfo(fileHandle, filp, tlink,
629 oplock);
630 if (cfile == NULL) {
631 fput(filp);
632 CIFSSMBClose(xid, pTcon, fileHandle);
633 rc = -ENOMEM;
634 goto lookup_out;
635 }
636 }
637 /* since paths are not looked up by component - the parent
638 directories are presumed to be good here */
639 renew_parental_timestamps(direntry);
640
641 } else if (rc == -ENOENT) {
642 rc = 0;
643 direntry->d_time = jiffies;
644 d_add(direntry, NULL);
645 /* if it was once a directory (but how can we tell?) we could do
646 shrink_dcache_parent(direntry); */
647 } else if (rc != -EACCES) {
648 cERROR(1, "Unexpected lookup error %d", rc);
649 /* We special case check for Access Denied - since that
650 is a common return code */
651 }
652
653lookup_out:
654 kfree(full_path);
655 cifs_put_tlink(tlink);
656 FreeXid(xid);
657 return ERR_PTR(rc);
658}
659
660static int
661cifs_d_revalidate(struct dentry *direntry, struct nameidata *nd)
662{
663 if (nd && (nd->flags & LOOKUP_RCU))
664 return -ECHILD;
665
666 if (direntry->d_inode) {
667 if (cifs_revalidate_dentry(direntry))
668 return 0;
669 else {
670 /*
671 * If the inode wasn't known to be a dfs entry when
672 * the dentry was instantiated, such as when created
673 * via ->readdir(), it needs to be set now since the
674 * attributes will have been updated by
675 * cifs_revalidate_dentry().
676 */
677 if (IS_AUTOMOUNT(direntry->d_inode) &&
678 !(direntry->d_flags & DCACHE_NEED_AUTOMOUNT)) {
679 spin_lock(&direntry->d_lock);
680 direntry->d_flags |= DCACHE_NEED_AUTOMOUNT;
681 spin_unlock(&direntry->d_lock);
682 }
683
684 return 1;
685 }
686 }
687
688 /*
689 * This may be nfsd (or something), anyway, we can't see the
690 * intent of this. So, since this can be for creation, drop it.
691 */
692 if (!nd)
693 return 0;
694
695 /*
696 * Drop the negative dentry, in order to make sure to use the
697 * case sensitive name which is specified by user if this is
698 * for creation.
699 */
700 if (nd->flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
701 return 0;
702
703 if (time_after(jiffies, direntry->d_time + HZ) || !lookupCacheEnabled)
704 return 0;
705
706 return 1;
707}
708
709/* static int cifs_d_delete(struct dentry *direntry)
710{
711 int rc = 0;
712
713 cFYI(1, "In cifs d_delete, name = %s", direntry->d_name.name);
714
715 return rc;
716} */
717
718const struct dentry_operations cifs_dentry_ops = {
719 .d_revalidate = cifs_d_revalidate,
720 .d_automount = cifs_dfs_d_automount,
721/* d_delete: cifs_d_delete, */ /* not needed except for debugging */
722};
723
724static int cifs_ci_hash(const struct dentry *dentry, const struct inode *inode,
725 struct qstr *q)
726{
727 struct nls_table *codepage = CIFS_SB(dentry->d_sb)->local_nls;
728 unsigned long hash;
729 int i;
730
731 hash = init_name_hash();
732 for (i = 0; i < q->len; i++)
733 hash = partial_name_hash(nls_tolower(codepage, q->name[i]),
734 hash);
735 q->hash = end_name_hash(hash);
736
737 return 0;
738}
739
740static int cifs_ci_compare(const struct dentry *parent,
741 const struct inode *pinode,
742 const struct dentry *dentry, const struct inode *inode,
743 unsigned int len, const char *str, const struct qstr *name)
744{
745 struct nls_table *codepage = CIFS_SB(pinode->i_sb)->local_nls;
746
747 if ((name->len == len) &&
748 (nls_strnicmp(codepage, name->name, str, len) == 0))
749 return 0;
750 return 1;
751}
752
753const struct dentry_operations cifs_ci_dentry_ops = {
754 .d_revalidate = cifs_d_revalidate,
755 .d_hash = cifs_ci_hash,
756 .d_compare = cifs_ci_compare,
757 .d_automount = cifs_dfs_d_automount,
758};
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 cifs_set_time(direntry, 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, 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 memcpy(full_path, tcon->treeName, dfsplen);
73 full_path[dfsplen] = CIFS_DIR_SEP(cifs_sb);
74 memcpy(full_path + dfsplen + 1, vol->prepath, pplen);
75 convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
76 return full_path;
77}
78
79/* Note: caller must free return buffer */
80char *
81build_path_from_dentry(struct dentry *direntry)
82{
83 struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
84 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
85 bool prefix = tcon->Flags & SMB_SHARE_IS_IN_DFS;
86
87 return build_path_from_dentry_optional_prefix(direntry,
88 prefix);
89}
90
91char *
92build_path_from_dentry_optional_prefix(struct dentry *direntry, bool prefix)
93{
94 struct dentry *temp;
95 int namelen;
96 int dfsplen;
97 int pplen = 0;
98 char *full_path;
99 char dirsep;
100 struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
101 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
102 unsigned seq;
103
104 dirsep = CIFS_DIR_SEP(cifs_sb);
105 if (prefix)
106 dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1);
107 else
108 dfsplen = 0;
109
110 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
111 pplen = cifs_sb->prepath ? strlen(cifs_sb->prepath) + 1 : 0;
112
113cifs_bp_rename_retry:
114 namelen = dfsplen + pplen;
115 seq = read_seqbegin(&rename_lock);
116 rcu_read_lock();
117 for (temp = direntry; !IS_ROOT(temp);) {
118 namelen += (1 + temp->d_name.len);
119 temp = temp->d_parent;
120 if (temp == NULL) {
121 cifs_dbg(VFS, "corrupt dentry\n");
122 rcu_read_unlock();
123 return NULL;
124 }
125 }
126 rcu_read_unlock();
127
128 full_path = kmalloc(namelen+1, GFP_ATOMIC);
129 if (full_path == NULL)
130 return full_path;
131 full_path[namelen] = 0; /* trailing null */
132 rcu_read_lock();
133 for (temp = direntry; !IS_ROOT(temp);) {
134 spin_lock(&temp->d_lock);
135 namelen -= 1 + temp->d_name.len;
136 if (namelen < 0) {
137 spin_unlock(&temp->d_lock);
138 break;
139 } else {
140 full_path[namelen] = dirsep;
141 strncpy(full_path + namelen + 1, temp->d_name.name,
142 temp->d_name.len);
143 cifs_dbg(FYI, "name: %s\n", full_path + namelen);
144 }
145 spin_unlock(&temp->d_lock);
146 temp = temp->d_parent;
147 if (temp == NULL) {
148 cifs_dbg(VFS, "corrupt dentry\n");
149 rcu_read_unlock();
150 kfree(full_path);
151 return NULL;
152 }
153 }
154 rcu_read_unlock();
155 if (namelen != dfsplen + pplen || read_seqretry(&rename_lock, seq)) {
156 cifs_dbg(FYI, "did not end path lookup where expected. namelen=%ddfsplen=%d\n",
157 namelen, dfsplen);
158 /* presumably this is only possible if racing with a rename
159 of one of the parent directories (we can not lock the dentries
160 above us to prevent this, but retrying should be harmless) */
161 kfree(full_path);
162 goto cifs_bp_rename_retry;
163 }
164 /* DIR_SEP already set for byte 0 / vs \ but not for
165 subsequent slashes in prepath which currently must
166 be entered the right way - not sure if there is an alternative
167 since the '\' is a valid posix character so we can not switch
168 those safely to '/' if any are found in the middle of the prepath */
169 /* BB test paths to Windows with '/' in the midst of prepath */
170
171 if (pplen) {
172 int i;
173
174 cifs_dbg(FYI, "using cifs_sb prepath <%s>\n", cifs_sb->prepath);
175 memcpy(full_path+dfsplen+1, cifs_sb->prepath, pplen-1);
176 full_path[dfsplen] = dirsep;
177 for (i = 0; i < pplen-1; i++)
178 if (full_path[dfsplen+1+i] == '/')
179 full_path[dfsplen+1+i] = CIFS_DIR_SEP(cifs_sb);
180 }
181
182 if (dfsplen) {
183 strncpy(full_path, tcon->treeName, dfsplen);
184 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
185 int i;
186 for (i = 0; i < dfsplen; i++) {
187 if (full_path[i] == '\\')
188 full_path[i] = '/';
189 }
190 }
191 }
192 return full_path;
193}
194
195/*
196 * Don't allow path components longer than the server max.
197 * Don't allow the separator character in a path component.
198 * The VFS will not allow "/", but "\" is allowed by posix.
199 */
200static int
201check_name(struct dentry *direntry, struct cifs_tcon *tcon)
202{
203 struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
204 int i;
205
206 if (unlikely(tcon->fsAttrInfo.MaxPathNameComponentLength &&
207 direntry->d_name.len >
208 le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength)))
209 return -ENAMETOOLONG;
210
211 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)) {
212 for (i = 0; i < direntry->d_name.len; i++) {
213 if (direntry->d_name.name[i] == '\\') {
214 cifs_dbg(FYI, "Invalid file name\n");
215 return -EINVAL;
216 }
217 }
218 }
219 return 0;
220}
221
222
223/* Inode operations in similar order to how they appear in Linux file fs.h */
224
225static int
226cifs_do_create(struct inode *inode, struct dentry *direntry, unsigned int xid,
227 struct tcon_link *tlink, unsigned oflags, umode_t mode,
228 __u32 *oplock, struct cifs_fid *fid)
229{
230 int rc = -ENOENT;
231 int create_options = CREATE_NOT_DIR;
232 int desired_access;
233 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
234 struct cifs_tcon *tcon = tlink_tcon(tlink);
235 char *full_path = NULL;
236 FILE_ALL_INFO *buf = NULL;
237 struct inode *newinode = NULL;
238 int disposition;
239 struct TCP_Server_Info *server = tcon->ses->server;
240 struct cifs_open_parms oparms;
241
242 *oplock = 0;
243 if (tcon->ses->server->oplocks)
244 *oplock = REQ_OPLOCK;
245
246 full_path = build_path_from_dentry(direntry);
247 if (!full_path)
248 return -ENOMEM;
249
250 if (tcon->unix_ext && cap_unix(tcon->ses) && !tcon->broken_posix_open &&
251 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
252 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
253 rc = cifs_posix_open(full_path, &newinode, inode->i_sb, mode,
254 oflags, oplock, &fid->netfid, xid);
255 switch (rc) {
256 case 0:
257 if (newinode == NULL) {
258 /* query inode info */
259 goto cifs_create_get_file_info;
260 }
261
262 if (S_ISDIR(newinode->i_mode)) {
263 CIFSSMBClose(xid, tcon, fid->netfid);
264 iput(newinode);
265 rc = -EISDIR;
266 goto out;
267 }
268
269 if (!S_ISREG(newinode->i_mode)) {
270 /*
271 * The server may allow us to open things like
272 * FIFOs, but the client isn't set up to deal
273 * with that. If it's not a regular file, just
274 * close it and proceed as if it were a normal
275 * lookup.
276 */
277 CIFSSMBClose(xid, tcon, fid->netfid);
278 goto cifs_create_get_file_info;
279 }
280 /* success, no need to query */
281 goto cifs_create_set_dentry;
282
283 case -ENOENT:
284 goto cifs_create_get_file_info;
285
286 case -EIO:
287 case -EINVAL:
288 /*
289 * EIO could indicate that (posix open) operation is not
290 * supported, despite what server claimed in capability
291 * negotiation.
292 *
293 * POSIX open in samba versions 3.3.1 and earlier could
294 * incorrectly fail with invalid parameter.
295 */
296 tcon->broken_posix_open = true;
297 break;
298
299 case -EREMOTE:
300 case -EOPNOTSUPP:
301 /*
302 * EREMOTE indicates DFS junction, which is not handled
303 * in posix open. If either that or op not supported
304 * returned, follow the normal lookup.
305 */
306 break;
307
308 default:
309 goto out;
310 }
311 /*
312 * fallthrough to retry, using older open call, this is case
313 * where server does not support this SMB level, and falsely
314 * claims capability (also get here for DFS case which should be
315 * rare for path not covered on files)
316 */
317 }
318
319 desired_access = 0;
320 if (OPEN_FMODE(oflags) & FMODE_READ)
321 desired_access |= GENERIC_READ; /* is this too little? */
322 if (OPEN_FMODE(oflags) & FMODE_WRITE)
323 desired_access |= GENERIC_WRITE;
324
325 disposition = FILE_OVERWRITE_IF;
326 if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
327 disposition = FILE_CREATE;
328 else if ((oflags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
329 disposition = FILE_OVERWRITE_IF;
330 else if ((oflags & O_CREAT) == O_CREAT)
331 disposition = FILE_OPEN_IF;
332 else
333 cifs_dbg(FYI, "Create flag not set in create function\n");
334
335 /*
336 * BB add processing to set equivalent of mode - e.g. via CreateX with
337 * ACLs
338 */
339
340 if (!server->ops->open) {
341 rc = -ENOSYS;
342 goto out;
343 }
344
345 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
346 if (buf == NULL) {
347 rc = -ENOMEM;
348 goto out;
349 }
350
351 /*
352 * if we're not using unix extensions, see if we need to set
353 * ATTR_READONLY on the create call
354 */
355 if (!tcon->unix_ext && (mode & S_IWUGO) == 0)
356 create_options |= CREATE_OPTION_READONLY;
357
358 oparms.tcon = tcon;
359 oparms.cifs_sb = cifs_sb;
360 oparms.desired_access = desired_access;
361 oparms.create_options = cifs_create_options(cifs_sb, create_options);
362 oparms.disposition = disposition;
363 oparms.path = full_path;
364 oparms.fid = fid;
365 oparms.reconnect = false;
366 oparms.mode = mode;
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
408cifs_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 /* TODO: Add support for calling POSIX query info here, but passing in fid */
415 rc = cifs_get_inode_info(&newinode, full_path, buf, inode->i_sb,
416 xid, fid);
417 if (newinode) {
418 if (server->ops->set_lease_key)
419 server->ops->set_lease_key(newinode, fid);
420 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
421 newinode->i_mode = mode;
422 if ((*oplock & CIFS_CREATE_ACTION) &&
423 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)) {
424 newinode->i_uid = current_fsuid();
425 if (inode->i_mode & S_ISGID)
426 newinode->i_gid = inode->i_gid;
427 else
428 newinode->i_gid = current_fsgid();
429 }
430 }
431 }
432
433cifs_create_set_dentry:
434 if (rc != 0) {
435 cifs_dbg(FYI, "Create worked, get_inode_info failed rc = %d\n",
436 rc);
437 goto out_err;
438 }
439
440 if (S_ISDIR(newinode->i_mode)) {
441 rc = -EISDIR;
442 goto out_err;
443 }
444
445 d_drop(direntry);
446 d_add(direntry, newinode);
447
448out:
449 kfree(buf);
450 kfree(full_path);
451 return rc;
452
453out_err:
454 if (server->ops->close)
455 server->ops->close(xid, tcon, fid);
456 if (newinode)
457 iput(newinode);
458 goto out;
459}
460
461int
462cifs_atomic_open(struct inode *inode, struct dentry *direntry,
463 struct file *file, unsigned oflags, umode_t mode)
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 xid = get_xid();
504
505 cifs_dbg(FYI, "parent inode = 0x%p name is: %pd and dentry = 0x%p\n",
506 inode, direntry, direntry);
507
508 tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb));
509 if (IS_ERR(tlink)) {
510 rc = PTR_ERR(tlink);
511 goto out_free_xid;
512 }
513
514 tcon = tlink_tcon(tlink);
515
516 rc = check_name(direntry, tcon);
517 if (rc)
518 goto out;
519
520 server = tcon->ses->server;
521
522 if (server->ops->new_lease_key)
523 server->ops->new_lease_key(&fid);
524
525 cifs_add_pending_open(&fid, tlink, &open);
526
527 rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode,
528 &oplock, &fid);
529
530 if (rc) {
531 cifs_del_pending_open(&open);
532 goto out;
533 }
534
535 if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
536 file->f_mode |= FMODE_CREATED;
537
538 rc = finish_open(file, direntry, generic_file_open);
539 if (rc) {
540 if (server->ops->close)
541 server->ops->close(xid, tcon, &fid);
542 cifs_del_pending_open(&open);
543 goto out;
544 }
545
546 if (file->f_flags & O_DIRECT &&
547 CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) {
548 if (CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
549 file->f_op = &cifs_file_direct_nobrl_ops;
550 else
551 file->f_op = &cifs_file_direct_ops;
552 }
553
554 file_info = cifs_new_fileinfo(&fid, file, tlink, oplock);
555 if (file_info == NULL) {
556 if (server->ops->close)
557 server->ops->close(xid, tcon, &fid);
558 cifs_del_pending_open(&open);
559 rc = -ENOMEM;
560 }
561
562out:
563 cifs_put_tlink(tlink);
564out_free_xid:
565 free_xid(xid);
566 return rc;
567}
568
569int 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);
608out_free_xid:
609 free_xid(xid);
610 return rc;
611}
612
613int 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 struct cifs_sb_info *cifs_sb;
619 struct tcon_link *tlink;
620 struct cifs_tcon *tcon;
621 char *full_path = NULL;
622
623 if (!old_valid_dev(device_number))
624 return -EINVAL;
625
626 cifs_sb = CIFS_SB(inode->i_sb);
627 tlink = cifs_sb_tlink(cifs_sb);
628 if (IS_ERR(tlink))
629 return PTR_ERR(tlink);
630
631 tcon = tlink_tcon(tlink);
632
633 xid = get_xid();
634
635 full_path = build_path_from_dentry(direntry);
636 if (full_path == NULL) {
637 rc = -ENOMEM;
638 goto mknod_out;
639 }
640
641 rc = tcon->ses->server->ops->make_node(xid, inode, direntry, tcon,
642 full_path, mode,
643 device_number);
644
645mknod_out:
646 kfree(full_path);
647 free_xid(xid);
648 cifs_put_tlink(tlink);
649 return rc;
650}
651
652struct dentry *
653cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
654 unsigned int flags)
655{
656 unsigned int xid;
657 int rc = 0; /* to get around spurious gcc warning, set to zero here */
658 struct cifs_sb_info *cifs_sb;
659 struct tcon_link *tlink;
660 struct cifs_tcon *pTcon;
661 struct inode *newInode = NULL;
662 char *full_path = NULL;
663
664 xid = get_xid();
665
666 cifs_dbg(FYI, "parent inode = 0x%p name is: %pd and dentry = 0x%p\n",
667 parent_dir_inode, direntry, direntry);
668
669 /* check whether path exists */
670
671 cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
672 tlink = cifs_sb_tlink(cifs_sb);
673 if (IS_ERR(tlink)) {
674 free_xid(xid);
675 return ERR_CAST(tlink);
676 }
677 pTcon = tlink_tcon(tlink);
678
679 rc = check_name(direntry, pTcon);
680 if (unlikely(rc)) {
681 cifs_put_tlink(tlink);
682 free_xid(xid);
683 return ERR_PTR(rc);
684 }
685
686 /* can not grab the rename sem here since it would
687 deadlock in the cases (beginning of sys_rename itself)
688 in which we already have the sb rename sem */
689 full_path = build_path_from_dentry(direntry);
690 if (full_path == NULL) {
691 cifs_put_tlink(tlink);
692 free_xid(xid);
693 return ERR_PTR(-ENOMEM);
694 }
695
696 if (d_really_is_positive(direntry)) {
697 cifs_dbg(FYI, "non-NULL inode in lookup\n");
698 } else {
699 cifs_dbg(FYI, "NULL inode in lookup\n");
700 }
701 cifs_dbg(FYI, "Full path: %s inode = 0x%p\n",
702 full_path, d_inode(direntry));
703
704 if (pTcon->posix_extensions)
705 rc = smb311_posix_get_inode_info(&newInode, full_path, parent_dir_inode->i_sb, xid);
706 else if (pTcon->unix_ext) {
707 rc = cifs_get_inode_info_unix(&newInode, full_path,
708 parent_dir_inode->i_sb, xid);
709 } else {
710 rc = cifs_get_inode_info(&newInode, full_path, NULL,
711 parent_dir_inode->i_sb, xid, NULL);
712 }
713
714 if (rc == 0) {
715 /* since paths are not looked up by component - the parent
716 directories are presumed to be good here */
717 renew_parental_timestamps(direntry);
718 } else if (rc == -ENOENT) {
719 cifs_set_time(direntry, jiffies);
720 newInode = NULL;
721 } else {
722 if (rc != -EACCES) {
723 cifs_dbg(FYI, "Unexpected lookup error %d\n", rc);
724 /* We special case check for Access Denied - since that
725 is a common return code */
726 }
727 newInode = ERR_PTR(rc);
728 }
729 kfree(full_path);
730 cifs_put_tlink(tlink);
731 free_xid(xid);
732 return d_splice_alias(newInode, direntry);
733}
734
735static int
736cifs_d_revalidate(struct dentry *direntry, unsigned int flags)
737{
738 struct inode *inode;
739
740 if (flags & LOOKUP_RCU)
741 return -ECHILD;
742
743 if (d_really_is_positive(direntry)) {
744 inode = d_inode(direntry);
745 if ((flags & LOOKUP_REVAL) && !CIFS_CACHE_READ(CIFS_I(inode)))
746 CIFS_I(inode)->time = 0; /* force reval */
747
748 if (cifs_revalidate_dentry(direntry))
749 return 0;
750 else {
751 /*
752 * If the inode wasn't known to be a dfs entry when
753 * the dentry was instantiated, such as when created
754 * via ->readdir(), it needs to be set now since the
755 * attributes will have been updated by
756 * cifs_revalidate_dentry().
757 */
758 if (IS_AUTOMOUNT(inode) &&
759 !(direntry->d_flags & DCACHE_NEED_AUTOMOUNT)) {
760 spin_lock(&direntry->d_lock);
761 direntry->d_flags |= DCACHE_NEED_AUTOMOUNT;
762 spin_unlock(&direntry->d_lock);
763 }
764
765 return 1;
766 }
767 }
768
769 /*
770 * This may be nfsd (or something), anyway, we can't see the
771 * intent of this. So, since this can be for creation, drop it.
772 */
773 if (!flags)
774 return 0;
775
776 /*
777 * Drop the negative dentry, in order to make sure to use the
778 * case sensitive name which is specified by user if this is
779 * for creation.
780 */
781 if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
782 return 0;
783
784 if (time_after(jiffies, cifs_get_time(direntry) + HZ) || !lookupCacheEnabled)
785 return 0;
786
787 return 1;
788}
789
790/* static int cifs_d_delete(struct dentry *direntry)
791{
792 int rc = 0;
793
794 cifs_dbg(FYI, "In cifs d_delete, name = %pd\n", direntry);
795
796 return rc;
797} */
798
799const struct dentry_operations cifs_dentry_ops = {
800 .d_revalidate = cifs_d_revalidate,
801 .d_automount = cifs_dfs_d_automount,
802/* d_delete: cifs_d_delete, */ /* not needed except for debugging */
803};
804
805static int cifs_ci_hash(const struct dentry *dentry, struct qstr *q)
806{
807 struct nls_table *codepage = CIFS_SB(dentry->d_sb)->local_nls;
808 unsigned long hash;
809 wchar_t c;
810 int i, charlen;
811
812 hash = init_name_hash(dentry);
813 for (i = 0; i < q->len; i += charlen) {
814 charlen = codepage->char2uni(&q->name[i], q->len - i, &c);
815 /* error out if we can't convert the character */
816 if (unlikely(charlen < 0))
817 return charlen;
818 hash = partial_name_hash(cifs_toupper(c), hash);
819 }
820 q->hash = end_name_hash(hash);
821
822 return 0;
823}
824
825static int cifs_ci_compare(const struct dentry *dentry,
826 unsigned int len, const char *str, const struct qstr *name)
827{
828 struct nls_table *codepage = CIFS_SB(dentry->d_sb)->local_nls;
829 wchar_t c1, c2;
830 int i, l1, l2;
831
832 /*
833 * We make the assumption here that uppercase characters in the local
834 * codepage are always the same length as their lowercase counterparts.
835 *
836 * If that's ever not the case, then this will fail to match it.
837 */
838 if (name->len != len)
839 return 1;
840
841 for (i = 0; i < len; i += l1) {
842 /* Convert characters in both strings to UTF-16. */
843 l1 = codepage->char2uni(&str[i], len - i, &c1);
844 l2 = codepage->char2uni(&name->name[i], name->len - i, &c2);
845
846 /*
847 * If we can't convert either character, just declare it to
848 * be 1 byte long and compare the original byte.
849 */
850 if (unlikely(l1 < 0 && l2 < 0)) {
851 if (str[i] != name->name[i])
852 return 1;
853 l1 = 1;
854 continue;
855 }
856
857 /*
858 * Here, we again ass|u|me that upper/lowercase versions of
859 * a character are the same length in the local NLS.
860 */
861 if (l1 != l2)
862 return 1;
863
864 /* Now compare uppercase versions of these characters */
865 if (cifs_toupper(c1) != cifs_toupper(c2))
866 return 1;
867 }
868
869 return 0;
870}
871
872const struct dentry_operations cifs_ci_dentry_ops = {
873 .d_revalidate = cifs_d_revalidate,
874 .d_hash = cifs_ci_hash,
875 .d_compare = cifs_ci_compare,
876 .d_automount = cifs_dfs_d_automount,
877};