1 // SPDX-License-Identifier: LGPL-2.1
2 /*
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 */
10 #include <linux/fs.h>
11 #include <linux/stat.h>
12 #include <linux/slab.h>
13 #include <linux/namei.h>
14 #include <linux/mount.h>
15 #include <linux/file.h>
16 #include "cifsfs.h"
17 #include "cifspdu.h"
18 #include "cifsglob.h"
19 #include "cifsproto.h"
20 #include "cifs_debug.h"
21 #include "cifs_fs_sb.h"
22 #include "cifs_unicode.h"
23 #include "fs_context.h"
24 #include "cifs_ioctl.h"
25 #include "fscache.h"
26
27 static void
renew_parental_timestamps(struct dentry * direntry)28 renew_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
38 char *
cifs_build_path_to_root(struct smb3_fs_context * ctx,struct cifs_sb_info * cifs_sb,struct cifs_tcon * tcon,int add_treename)39 cifs_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->tree_name, 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->tree_name, 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 */
70 const char *
build_path_from_dentry(struct dentry * direntry,void * page)71 build_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
81 char *
build_path_from_dentry_optional_prefix(struct dentry * direntry,void * page,bool prefix)82 build_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->tree_name, 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->tree_name, 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 */
143 static int
check_name(struct dentry * direntry,struct cifs_tcon * tcon)144 check_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
cifs_do_create(struct inode * inode,struct dentry * direntry,unsigned int xid,struct tcon_link * tlink,unsigned int oflags,umode_t mode,__u32 * oplock,struct cifs_fid * fid,struct cifs_open_info_data * buf)168 static int cifs_do_create(struct inode *inode, struct dentry *direntry, unsigned int xid,
169 struct tcon_link *tlink, unsigned int oflags, umode_t mode, __u32 *oplock,
170 struct cifs_fid *fid, struct cifs_open_info_data *buf)
171 {
172 int rc = -ENOENT;
173 int create_options = CREATE_NOT_DIR;
174 int desired_access;
175 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
176 struct cifs_tcon *tcon = tlink_tcon(tlink);
177 const char *full_path;
178 void *page = alloc_dentry_path();
179 struct inode *newinode = NULL;
180 int disposition;
181 struct TCP_Server_Info *server = tcon->ses->server;
182 struct cifs_open_parms oparms;
183
184 *oplock = 0;
185 if (tcon->ses->server->oplocks)
186 *oplock = REQ_OPLOCK;
187
188 full_path = build_path_from_dentry(direntry, page);
189 if (IS_ERR(full_path)) {
190 free_dentry_path(page);
191 return PTR_ERR(full_path);
192 }
193
194 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
195 if (tcon->unix_ext && cap_unix(tcon->ses) && !tcon->broken_posix_open &&
196 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
197 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
198 rc = cifs_posix_open(full_path, &newinode, inode->i_sb, mode,
199 oflags, oplock, &fid->netfid, xid);
200 switch (rc) {
201 case 0:
202 if (newinode == NULL) {
203 /* query inode info */
204 goto cifs_create_get_file_info;
205 }
206
207 if (S_ISDIR(newinode->i_mode)) {
208 CIFSSMBClose(xid, tcon, fid->netfid);
209 iput(newinode);
210 rc = -EISDIR;
211 goto out;
212 }
213
214 if (!S_ISREG(newinode->i_mode)) {
215 /*
216 * The server may allow us to open things like
217 * FIFOs, but the client isn't set up to deal
218 * with that. If it's not a regular file, just
219 * close it and proceed as if it were a normal
220 * lookup.
221 */
222 CIFSSMBClose(xid, tcon, fid->netfid);
223 goto cifs_create_get_file_info;
224 }
225 /* success, no need to query */
226 goto cifs_create_set_dentry;
227
228 case -ENOENT:
229 goto cifs_create_get_file_info;
230
231 case -EIO:
232 case -EINVAL:
233 /*
234 * EIO could indicate that (posix open) operation is not
235 * supported, despite what server claimed in capability
236 * negotiation.
237 *
238 * POSIX open in samba versions 3.3.1 and earlier could
239 * incorrectly fail with invalid parameter.
240 */
241 tcon->broken_posix_open = true;
242 break;
243
244 case -EREMOTE:
245 case -EOPNOTSUPP:
246 /*
247 * EREMOTE indicates DFS junction, which is not handled
248 * in posix open. If either that or op not supported
249 * returned, follow the normal lookup.
250 */
251 break;
252
253 default:
254 goto out;
255 }
256 /*
257 * fallthrough to retry, using older open call, this is case
258 * where server does not support this SMB level, and falsely
259 * claims capability (also get here for DFS case which should be
260 * rare for path not covered on files)
261 */
262 }
263 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
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 /*
292 * if we're not using unix extensions, see if we need to set
293 * ATTR_READONLY on the create call
294 */
295 if (!tcon->unix_ext && (mode & S_IWUGO) == 0)
296 create_options |= CREATE_OPTION_READONLY;
297
298 oparms.tcon = tcon;
299 oparms.cifs_sb = cifs_sb;
300 oparms.desired_access = desired_access;
301 oparms.create_options = cifs_create_options(cifs_sb, create_options);
302 oparms.disposition = disposition;
303 oparms.path = full_path;
304 oparms.fid = fid;
305 oparms.reconnect = false;
306 oparms.mode = mode;
307 rc = server->ops->open(xid, &oparms, oplock, buf);
308 if (rc) {
309 cifs_dbg(FYI, "cifs_create returned 0x%x\n", rc);
310 goto out;
311 }
312
313 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
314 /*
315 * If Open reported that we actually created a file then we now have to
316 * set the mode if possible.
317 */
318 if ((tcon->unix_ext) && (*oplock & CIFS_CREATE_ACTION)) {
319 struct cifs_unix_set_info_args args = {
320 .mode = mode,
321 .ctime = NO_CHANGE_64,
322 .atime = NO_CHANGE_64,
323 .mtime = NO_CHANGE_64,
324 .device = 0,
325 };
326
327 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
328 args.uid = current_fsuid();
329 if (inode->i_mode & S_ISGID)
330 args.gid = inode->i_gid;
331 else
332 args.gid = current_fsgid();
333 } else {
334 args.uid = INVALID_UID; /* no change */
335 args.gid = INVALID_GID; /* no change */
336 }
337 CIFSSMBUnixSetFileInfo(xid, tcon, &args, fid->netfid,
338 current->tgid);
339 } else {
340 /*
341 * BB implement mode setting via Windows security
342 * descriptors e.g.
343 */
344 /* CIFSSMBWinSetPerms(xid,tcon,path,mode,-1,-1,nls);*/
345
346 /* Could set r/o dos attribute if mode & 0222 == 0 */
347 }
348
349 cifs_create_get_file_info:
350 /* server might mask mode so we have to query for it */
351 if (tcon->unix_ext)
352 rc = cifs_get_inode_info_unix(&newinode, full_path, inode->i_sb,
353 xid);
354 else {
355 #else
356 {
357 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
358 /* TODO: Add support for calling POSIX query info here, but passing in fid */
359 rc = cifs_get_inode_info(&newinode, full_path, buf, inode->i_sb, xid, fid);
360 if (newinode) {
361 if (server->ops->set_lease_key)
362 server->ops->set_lease_key(newinode, fid);
363 if ((*oplock & CIFS_CREATE_ACTION) && S_ISREG(newinode->i_mode)) {
364 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
365 newinode->i_mode = mode;
366 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
367 newinode->i_uid = current_fsuid();
368 if (inode->i_mode & S_ISGID)
369 newinode->i_gid = inode->i_gid;
370 else
371 newinode->i_gid = current_fsgid();
372 }
373 }
374 }
375 }
376
377 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
378 cifs_create_set_dentry:
379 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
380 if (rc != 0) {
381 cifs_dbg(FYI, "Create worked, get_inode_info failed rc = %d\n",
382 rc);
383 goto out_err;
384 }
385
386 if (newinode)
387 if (S_ISDIR(newinode->i_mode)) {
388 rc = -EISDIR;
389 goto out_err;
390 }
391
392 d_drop(direntry);
393 d_add(direntry, newinode);
394
395 out:
396 free_dentry_path(page);
397 return rc;
398
399 out_err:
400 if (server->ops->close)
401 server->ops->close(xid, tcon, fid);
402 if (newinode)
403 iput(newinode);
404 goto out;
405 }
406
407 int
408 cifs_atomic_open(struct inode *inode, struct dentry *direntry,
409 struct file *file, unsigned oflags, umode_t mode)
410 {
411 int rc;
412 unsigned int xid;
413 struct tcon_link *tlink;
414 struct cifs_tcon *tcon;
415 struct TCP_Server_Info *server;
416 struct cifs_fid fid = {};
417 struct cifs_pending_open open;
418 __u32 oplock;
419 struct cifsFileInfo *file_info;
420 struct cifs_open_info_data buf = {};
421
422 if (unlikely(cifs_forced_shutdown(CIFS_SB(inode->i_sb))))
423 return -EIO;
424
425 /*
426 * Posix open is only called (at lookup time) for file create now. For
427 * opens (rather than creates), because we do not know if it is a file
428 * or directory yet, and current Samba no longer allows us to do posix
429 * open on dirs, we could end up wasting an open call on what turns out
430 * to be a dir. For file opens, we wait to call posix open till
431 * cifs_open. It could be added to atomic_open in the future but the
432 * performance tradeoff of the extra network request when EISDIR or
433 * EACCES is returned would have to be weighed against the 50% reduction
434 * in network traffic in the other paths.
435 */
436 if (!(oflags & O_CREAT)) {
437 struct dentry *res;
438
439 /*
440 * Check for hashed negative dentry. We have already revalidated
441 * the dentry and it is fine. No need to perform another lookup.
442 */
443 if (!d_in_lookup(direntry))
444 return -ENOENT;
445
446 res = cifs_lookup(inode, direntry, 0);
447 if (IS_ERR(res))
448 return PTR_ERR(res);
449
450 return finish_no_open(file, res);
451 }
452
453 xid = get_xid();
454
455 cifs_dbg(FYI, "parent inode = 0x%p name is: %pd and dentry = 0x%p\n",
456 inode, direntry, direntry);
457
458 tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb));
459 if (IS_ERR(tlink)) {
460 rc = PTR_ERR(tlink);
461 goto out_free_xid;
462 }
463
464 tcon = tlink_tcon(tlink);
465
466 rc = check_name(direntry, tcon);
467 if (rc)
468 goto out;
469
470 server = tcon->ses->server;
471
472 if (server->ops->new_lease_key)
473 server->ops->new_lease_key(&fid);
474
475 cifs_add_pending_open(&fid, tlink, &open);
476
477 rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode,
478 &oplock, &fid, &buf);
479 if (rc) {
480 cifs_del_pending_open(&open);
481 goto out;
482 }
483
484 if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
485 file->f_mode |= FMODE_CREATED;
486
487 rc = finish_open(file, direntry, generic_file_open);
488 if (rc) {
489 if (server->ops->close)
490 server->ops->close(xid, tcon, &fid);
491 cifs_del_pending_open(&open);
492 goto out;
493 }
494
495 if (file->f_flags & O_DIRECT &&
496 CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) {
497 if (CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
498 file->f_op = &cifs_file_direct_nobrl_ops;
499 else
500 file->f_op = &cifs_file_direct_ops;
501 }
502
503 file_info = cifs_new_fileinfo(&fid, file, tlink, oplock, buf.symlink_target);
504 if (file_info == NULL) {
505 if (server->ops->close)
506 server->ops->close(xid, tcon, &fid);
507 cifs_del_pending_open(&open);
508 rc = -ENOMEM;
509 goto out;
510 }
511
512 fscache_use_cookie(cifs_inode_cookie(file_inode(file)),
513 file->f_mode & FMODE_WRITE);
514
515 out:
516 cifs_put_tlink(tlink);
517 out_free_xid:
518 free_xid(xid);
519 cifs_free_open_info(&buf);
520 return rc;
521 }
522
523 int cifs_create(struct user_namespace *mnt_userns, struct inode *inode,
524 struct dentry *direntry, umode_t mode, bool excl)
525 {
526 int rc;
527 unsigned int xid = get_xid();
528 /*
529 * BB below access is probably too much for mknod to request
530 * but we have to do query and setpathinfo so requesting
531 * less could fail (unless we want to request getatr and setatr
532 * permissions (only). At least for POSIX we do not have to
533 * request so much.
534 */
535 unsigned oflags = O_EXCL | O_CREAT | O_RDWR;
536 struct tcon_link *tlink;
537 struct cifs_tcon *tcon;
538 struct TCP_Server_Info *server;
539 struct cifs_fid fid;
540 __u32 oplock;
541 struct cifs_open_info_data buf = {};
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 if (unlikely(cifs_forced_shutdown(CIFS_SB(inode->i_sb)))) {
547 rc = -EIO;
548 goto out_free_xid;
549 }
550
551 tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb));
552 rc = PTR_ERR(tlink);
553 if (IS_ERR(tlink))
554 goto out_free_xid;
555
556 tcon = tlink_tcon(tlink);
557 server = tcon->ses->server;
558
559 if (server->ops->new_lease_key)
560 server->ops->new_lease_key(&fid);
561
562 rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode, &oplock, &fid, &buf);
563 if (!rc && server->ops->close)
564 server->ops->close(xid, tcon, &fid);
565
566 cifs_free_open_info(&buf);
567 cifs_put_tlink(tlink);
568 out_free_xid:
569 free_xid(xid);
570 return rc;
571 }
572
573 int cifs_mknod(struct user_namespace *mnt_userns, struct inode *inode,
574 struct dentry *direntry, umode_t mode, dev_t device_number)
575 {
576 int rc = -EPERM;
577 unsigned int xid;
578 struct cifs_sb_info *cifs_sb;
579 struct tcon_link *tlink;
580 struct cifs_tcon *tcon;
581 const char *full_path;
582 void *page;
583
584 if (!old_valid_dev(device_number))
585 return -EINVAL;
586
587 cifs_sb = CIFS_SB(inode->i_sb);
588 if (unlikely(cifs_forced_shutdown(cifs_sb)))
589 return -EIO;
590
591 tlink = cifs_sb_tlink(cifs_sb);
592 if (IS_ERR(tlink))
593 return PTR_ERR(tlink);
594
595 page = alloc_dentry_path();
596 tcon = tlink_tcon(tlink);
597 xid = get_xid();
598
599 full_path = build_path_from_dentry(direntry, page);
600 if (IS_ERR(full_path)) {
601 rc = PTR_ERR(full_path);
602 goto mknod_out;
603 }
604
605 rc = tcon->ses->server->ops->make_node(xid, inode, direntry, tcon,
606 full_path, mode,
607 device_number);
608
609 mknod_out:
610 free_dentry_path(page);
611 free_xid(xid);
612 cifs_put_tlink(tlink);
613 return rc;
614 }
615
616 struct dentry *
617 cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
618 unsigned int flags)
619 {
620 unsigned int xid;
621 int rc = 0; /* to get around spurious gcc warning, set to zero here */
622 struct cifs_sb_info *cifs_sb;
623 struct tcon_link *tlink;
624 struct cifs_tcon *pTcon;
625 struct inode *newInode = NULL;
626 const char *full_path;
627 void *page;
628 int retry_count = 0;
629
630 xid = get_xid();
631
632 cifs_dbg(FYI, "parent inode = 0x%p name is: %pd and dentry = 0x%p\n",
633 parent_dir_inode, direntry, direntry);
634
635 /* check whether path exists */
636
637 cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
638 tlink = cifs_sb_tlink(cifs_sb);
639 if (IS_ERR(tlink)) {
640 free_xid(xid);
641 return ERR_CAST(tlink);
642 }
643 pTcon = tlink_tcon(tlink);
644
645 rc = check_name(direntry, pTcon);
646 if (unlikely(rc)) {
647 cifs_put_tlink(tlink);
648 free_xid(xid);
649 return ERR_PTR(rc);
650 }
651
652 /* can not grab the rename sem here since it would
653 deadlock in the cases (beginning of sys_rename itself)
654 in which we already have the sb rename sem */
655 page = alloc_dentry_path();
656 full_path = build_path_from_dentry(direntry, page);
657 if (IS_ERR(full_path)) {
658 cifs_put_tlink(tlink);
659 free_xid(xid);
660 free_dentry_path(page);
661 return ERR_CAST(full_path);
662 }
663
664 if (d_really_is_positive(direntry)) {
665 cifs_dbg(FYI, "non-NULL inode in lookup\n");
666 } else {
667 cifs_dbg(FYI, "NULL inode in lookup\n");
668 }
669 cifs_dbg(FYI, "Full path: %s inode = 0x%p\n",
670 full_path, d_inode(direntry));
671
672 again:
673 if (pTcon->posix_extensions)
674 rc = smb311_posix_get_inode_info(&newInode, full_path, parent_dir_inode->i_sb, xid);
675 else if (pTcon->unix_ext) {
676 rc = cifs_get_inode_info_unix(&newInode, full_path,
677 parent_dir_inode->i_sb, xid);
678 } else {
679 rc = cifs_get_inode_info(&newInode, full_path, NULL,
680 parent_dir_inode->i_sb, xid, NULL);
681 }
682
683 if (rc == 0) {
684 /* since paths are not looked up by component - the parent
685 directories are presumed to be good here */
686 renew_parental_timestamps(direntry);
687 } else if (rc == -EAGAIN && retry_count++ < 10) {
688 goto again;
689 } else if (rc == -ENOENT) {
690 cifs_set_time(direntry, jiffies);
691 newInode = NULL;
692 } else {
693 if (rc != -EACCES) {
694 cifs_dbg(FYI, "Unexpected lookup error %d\n", rc);
695 /* We special case check for Access Denied - since that
696 is a common return code */
697 }
698 newInode = ERR_PTR(rc);
699 }
700 free_dentry_path(page);
701 cifs_put_tlink(tlink);
702 free_xid(xid);
703 return d_splice_alias(newInode, direntry);
704 }
705
706 static int
707 cifs_d_revalidate(struct dentry *direntry, unsigned int flags)
708 {
709 struct inode *inode;
710 int rc;
711
712 if (flags & LOOKUP_RCU)
713 return -ECHILD;
714
715 if (d_really_is_positive(direntry)) {
716 inode = d_inode(direntry);
717 if ((flags & LOOKUP_REVAL) && !CIFS_CACHE_READ(CIFS_I(inode)))
718 CIFS_I(inode)->time = 0; /* force reval */
719
720 rc = cifs_revalidate_dentry(direntry);
721 if (rc) {
722 cifs_dbg(FYI, "cifs_revalidate_dentry failed with rc=%d", rc);
723 switch (rc) {
724 case -ENOENT:
725 case -ESTALE:
726 /*
727 * Those errors mean the dentry is invalid
728 * (file was deleted or recreated)
729 */
730 return 0;
731 default:
732 /*
733 * Otherwise some unexpected error happened
734 * report it as-is to VFS layer
735 */
736 return rc;
737 }
738 }
739 else {
740 /*
741 * If the inode wasn't known to be a dfs entry when
742 * the dentry was instantiated, such as when created
743 * via ->readdir(), it needs to be set now since the
744 * attributes will have been updated by
745 * cifs_revalidate_dentry().
746 */
747 if (IS_AUTOMOUNT(inode) &&
748 !(direntry->d_flags & DCACHE_NEED_AUTOMOUNT)) {
749 spin_lock(&direntry->d_lock);
750 direntry->d_flags |= DCACHE_NEED_AUTOMOUNT;
751 spin_unlock(&direntry->d_lock);
752 }
753
754 return 1;
755 }
756 }
757
758 /*
759 * This may be nfsd (or something), anyway, we can't see the
760 * intent of this. So, since this can be for creation, drop it.
761 */
762 if (!flags)
763 return 0;
764
765 /*
766 * Drop the negative dentry, in order to make sure to use the
767 * case sensitive name which is specified by user if this is
768 * for creation.
769 */
770 if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
771 return 0;
772
773 if (time_after(jiffies, cifs_get_time(direntry) + HZ) || !lookupCacheEnabled)
774 return 0;
775
776 return 1;
777 }
778
779 /* static int cifs_d_delete(struct dentry *direntry)
780 {
781 int rc = 0;
782
783 cifs_dbg(FYI, "In cifs d_delete, name = %pd\n", direntry);
784
785 return rc;
786 } */
787
788 const struct dentry_operations cifs_dentry_ops = {
789 .d_revalidate = cifs_d_revalidate,
790 .d_automount = cifs_dfs_d_automount,
791 /* d_delete: cifs_d_delete, */ /* not needed except for debugging */
792 };
793
794 static int cifs_ci_hash(const struct dentry *dentry, struct qstr *q)
795 {
796 struct nls_table *codepage = CIFS_SB(dentry->d_sb)->local_nls;
797 unsigned long hash;
798 wchar_t c;
799 int i, charlen;
800
801 hash = init_name_hash(dentry);
802 for (i = 0; i < q->len; i += charlen) {
803 charlen = codepage->char2uni(&q->name[i], q->len - i, &c);
804 /* error out if we can't convert the character */
805 if (unlikely(charlen < 0))
806 return charlen;
807 hash = partial_name_hash(cifs_toupper(c), hash);
808 }
809 q->hash = end_name_hash(hash);
810
811 return 0;
812 }
813
814 static int cifs_ci_compare(const struct dentry *dentry,
815 unsigned int len, const char *str, const struct qstr *name)
816 {
817 struct nls_table *codepage = CIFS_SB(dentry->d_sb)->local_nls;
818 wchar_t c1, c2;
819 int i, l1, l2;
820
821 /*
822 * We make the assumption here that uppercase characters in the local
823 * codepage are always the same length as their lowercase counterparts.
824 *
825 * If that's ever not the case, then this will fail to match it.
826 */
827 if (name->len != len)
828 return 1;
829
830 for (i = 0; i < len; i += l1) {
831 /* Convert characters in both strings to UTF-16. */
832 l1 = codepage->char2uni(&str[i], len - i, &c1);
833 l2 = codepage->char2uni(&name->name[i], name->len - i, &c2);
834
835 /*
836 * If we can't convert either character, just declare it to
837 * be 1 byte long and compare the original byte.
838 */
839 if (unlikely(l1 < 0 && l2 < 0)) {
840 if (str[i] != name->name[i])
841 return 1;
842 l1 = 1;
843 continue;
844 }
845
846 /*
847 * Here, we again ass|u|me that upper/lowercase versions of
848 * a character are the same length in the local NLS.
849 */
850 if (l1 != l2)
851 return 1;
852
853 /* Now compare uppercase versions of these characters */
854 if (cifs_toupper(c1) != cifs_toupper(c2))
855 return 1;
856 }
857
858 return 0;
859 }
860
861 const struct dentry_operations cifs_ci_dentry_ops = {
862 .d_revalidate = cifs_d_revalidate,
863 .d_hash = cifs_ci_hash,
864 .d_compare = cifs_ci_compare,
865 .d_automount = cifs_dfs_d_automount,
866 };
867