Merge tag 'regmap-fix-v5.11-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux/fpc-iii.git] / fs / cifs / dir.c
blob68900f1629bffa97d243d645c73777157a59d414
1 /*
2 * fs/cifs/dir.c
4 * vfs operations that deal with dentries
6 * Copyright (C) International Business Machines Corp., 2002,2009
7 * Author(s): Steve French (sfrench@us.ibm.com)
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.
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.
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
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 #include "fs_context.h"
38 static void
39 renew_parental_timestamps(struct dentry *direntry)
41 /* BB check if there is a way to get the kernel to do this or if we
42 really need this */
43 do {
44 cifs_set_time(direntry, jiffies);
45 direntry = direntry->d_parent;
46 } while (!IS_ROOT(direntry));
49 char *
50 cifs_build_path_to_root(struct smb3_fs_context *ctx, struct cifs_sb_info *cifs_sb,
51 struct cifs_tcon *tcon, int add_treename)
53 int pplen = ctx->prepath ? strlen(ctx->prepath) + 1 : 0;
54 int dfsplen;
55 char *full_path = NULL;
57 /* if no prefix path, simply set path to the root of share to "" */
58 if (pplen == 0) {
59 full_path = kzalloc(1, GFP_KERNEL);
60 return full_path;
63 if (add_treename)
64 dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1);
65 else
66 dfsplen = 0;
68 full_path = kmalloc(dfsplen + pplen + 1, GFP_KERNEL);
69 if (full_path == NULL)
70 return full_path;
72 if (dfsplen)
73 memcpy(full_path, tcon->treeName, dfsplen);
74 full_path[dfsplen] = CIFS_DIR_SEP(cifs_sb);
75 memcpy(full_path + dfsplen + 1, ctx->prepath, pplen);
76 convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
77 return full_path;
80 /* Note: caller must free return buffer */
81 char *
82 build_path_from_dentry(struct dentry *direntry)
84 struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
85 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
86 bool prefix = tcon->Flags & SMB_SHARE_IS_IN_DFS;
88 return build_path_from_dentry_optional_prefix(direntry,
89 prefix);
92 char *
93 build_path_from_dentry_optional_prefix(struct dentry *direntry, bool prefix)
95 struct dentry *temp;
96 int namelen;
97 int dfsplen;
98 int pplen = 0;
99 char *full_path;
100 char dirsep;
101 struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
102 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
103 unsigned seq;
105 dirsep = CIFS_DIR_SEP(cifs_sb);
106 if (prefix)
107 dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1);
108 else
109 dfsplen = 0;
111 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
112 pplen = cifs_sb->prepath ? strlen(cifs_sb->prepath) + 1 : 0;
114 cifs_bp_rename_retry:
115 namelen = dfsplen + pplen;
116 seq = read_seqbegin(&rename_lock);
117 rcu_read_lock();
118 for (temp = direntry; !IS_ROOT(temp);) {
119 namelen += (1 + temp->d_name.len);
120 temp = temp->d_parent;
121 if (temp == NULL) {
122 cifs_dbg(VFS, "corrupt dentry\n");
123 rcu_read_unlock();
124 return NULL;
127 rcu_read_unlock();
129 full_path = kmalloc(namelen+1, GFP_ATOMIC);
130 if (full_path == NULL)
131 return full_path;
132 full_path[namelen] = 0; /* trailing null */
133 rcu_read_lock();
134 for (temp = direntry; !IS_ROOT(temp);) {
135 spin_lock(&temp->d_lock);
136 namelen -= 1 + temp->d_name.len;
137 if (namelen < 0) {
138 spin_unlock(&temp->d_lock);
139 break;
140 } else {
141 full_path[namelen] = dirsep;
142 strncpy(full_path + namelen + 1, temp->d_name.name,
143 temp->d_name.len);
144 cifs_dbg(FYI, "name: %s\n", full_path + namelen);
146 spin_unlock(&temp->d_lock);
147 temp = temp->d_parent;
148 if (temp == NULL) {
149 cifs_dbg(VFS, "corrupt dentry\n");
150 rcu_read_unlock();
151 kfree(full_path);
152 return NULL;
155 rcu_read_unlock();
156 if (namelen != dfsplen + pplen || read_seqretry(&rename_lock, seq)) {
157 cifs_dbg(FYI, "did not end path lookup where expected. namelen=%ddfsplen=%d\n",
158 namelen, dfsplen);
159 /* presumably this is only possible if racing with a rename
160 of one of the parent directories (we can not lock the dentries
161 above us to prevent this, but retrying should be harmless) */
162 kfree(full_path);
163 goto cifs_bp_rename_retry;
165 /* DIR_SEP already set for byte 0 / vs \ but not for
166 subsequent slashes in prepath which currently must
167 be entered the right way - not sure if there is an alternative
168 since the '\' is a valid posix character so we can not switch
169 those safely to '/' if any are found in the middle of the prepath */
170 /* BB test paths to Windows with '/' in the midst of prepath */
172 if (pplen) {
173 int i;
175 cifs_dbg(FYI, "using cifs_sb prepath <%s>\n", cifs_sb->prepath);
176 memcpy(full_path+dfsplen+1, cifs_sb->prepath, pplen-1);
177 full_path[dfsplen] = dirsep;
178 for (i = 0; i < pplen-1; i++)
179 if (full_path[dfsplen+1+i] == '/')
180 full_path[dfsplen+1+i] = CIFS_DIR_SEP(cifs_sb);
183 if (dfsplen) {
184 strncpy(full_path, tcon->treeName, dfsplen);
185 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
186 int i;
187 for (i = 0; i < dfsplen; i++) {
188 if (full_path[i] == '\\')
189 full_path[i] = '/';
193 return full_path;
197 * Don't allow path components longer than the server max.
198 * Don't allow the separator character in a path component.
199 * The VFS will not allow "/", but "\" is allowed by posix.
201 static int
202 check_name(struct dentry *direntry, struct cifs_tcon *tcon)
204 struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
205 int i;
207 if (unlikely(tcon->fsAttrInfo.MaxPathNameComponentLength &&
208 direntry->d_name.len >
209 le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength)))
210 return -ENAMETOOLONG;
212 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)) {
213 for (i = 0; i < direntry->d_name.len; i++) {
214 if (direntry->d_name.name[i] == '\\') {
215 cifs_dbg(FYI, "Invalid file name\n");
216 return -EINVAL;
220 return 0;
224 /* Inode operations in similar order to how they appear in Linux file fs.h */
226 static int
227 cifs_do_create(struct inode *inode, struct dentry *direntry, unsigned int xid,
228 struct tcon_link *tlink, unsigned oflags, umode_t mode,
229 __u32 *oplock, struct cifs_fid *fid)
231 int rc = -ENOENT;
232 int create_options = CREATE_NOT_DIR;
233 int desired_access;
234 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
235 struct cifs_tcon *tcon = tlink_tcon(tlink);
236 char *full_path = NULL;
237 FILE_ALL_INFO *buf = NULL;
238 struct inode *newinode = NULL;
239 int disposition;
240 struct TCP_Server_Info *server = tcon->ses->server;
241 struct cifs_open_parms oparms;
243 *oplock = 0;
244 if (tcon->ses->server->oplocks)
245 *oplock = REQ_OPLOCK;
247 full_path = build_path_from_dentry(direntry);
248 if (!full_path)
249 return -ENOMEM;
251 if (tcon->unix_ext && cap_unix(tcon->ses) && !tcon->broken_posix_open &&
252 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
253 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
254 rc = cifs_posix_open(full_path, &newinode, inode->i_sb, mode,
255 oflags, oplock, &fid->netfid, xid);
256 switch (rc) {
257 case 0:
258 if (newinode == NULL) {
259 /* query inode info */
260 goto cifs_create_get_file_info;
263 if (S_ISDIR(newinode->i_mode)) {
264 CIFSSMBClose(xid, tcon, fid->netfid);
265 iput(newinode);
266 rc = -EISDIR;
267 goto out;
270 if (!S_ISREG(newinode->i_mode)) {
272 * The server may allow us to open things like
273 * FIFOs, but the client isn't set up to deal
274 * with that. If it's not a regular file, just
275 * close it and proceed as if it were a normal
276 * lookup.
278 CIFSSMBClose(xid, tcon, fid->netfid);
279 goto cifs_create_get_file_info;
281 /* success, no need to query */
282 goto cifs_create_set_dentry;
284 case -ENOENT:
285 goto cifs_create_get_file_info;
287 case -EIO:
288 case -EINVAL:
290 * EIO could indicate that (posix open) operation is not
291 * supported, despite what server claimed in capability
292 * negotiation.
294 * POSIX open in samba versions 3.3.1 and earlier could
295 * incorrectly fail with invalid parameter.
297 tcon->broken_posix_open = true;
298 break;
300 case -EREMOTE:
301 case -EOPNOTSUPP:
303 * EREMOTE indicates DFS junction, which is not handled
304 * in posix open. If either that or op not supported
305 * returned, follow the normal lookup.
307 break;
309 default:
310 goto out;
313 * fallthrough to retry, using older open call, this is case
314 * where server does not support this SMB level, and falsely
315 * claims capability (also get here for DFS case which should be
316 * rare for path not covered on files)
320 desired_access = 0;
321 if (OPEN_FMODE(oflags) & FMODE_READ)
322 desired_access |= GENERIC_READ; /* is this too little? */
323 if (OPEN_FMODE(oflags) & FMODE_WRITE)
324 desired_access |= GENERIC_WRITE;
326 disposition = FILE_OVERWRITE_IF;
327 if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
328 disposition = FILE_CREATE;
329 else if ((oflags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
330 disposition = FILE_OVERWRITE_IF;
331 else if ((oflags & O_CREAT) == O_CREAT)
332 disposition = FILE_OPEN_IF;
333 else
334 cifs_dbg(FYI, "Create flag not set in create function\n");
337 * BB add processing to set equivalent of mode - e.g. via CreateX with
338 * ACLs
341 if (!server->ops->open) {
342 rc = -ENOSYS;
343 goto out;
346 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
347 if (buf == NULL) {
348 rc = -ENOMEM;
349 goto out;
353 * if we're not using unix extensions, see if we need to set
354 * ATTR_READONLY on the create call
356 if (!tcon->unix_ext && (mode & S_IWUGO) == 0)
357 create_options |= CREATE_OPTION_READONLY;
359 oparms.tcon = tcon;
360 oparms.cifs_sb = cifs_sb;
361 oparms.desired_access = desired_access;
362 oparms.create_options = cifs_create_options(cifs_sb, create_options);
363 oparms.disposition = disposition;
364 oparms.path = full_path;
365 oparms.fid = fid;
366 oparms.reconnect = false;
367 oparms.mode = mode;
368 rc = server->ops->open(xid, &oparms, oplock, buf);
369 if (rc) {
370 cifs_dbg(FYI, "cifs_create returned 0x%x\n", rc);
371 goto out;
375 * If Open reported that we actually created a file then we now have to
376 * set the mode if possible.
378 if ((tcon->unix_ext) && (*oplock & CIFS_CREATE_ACTION)) {
379 struct cifs_unix_set_info_args args = {
380 .mode = mode,
381 .ctime = NO_CHANGE_64,
382 .atime = NO_CHANGE_64,
383 .mtime = NO_CHANGE_64,
384 .device = 0,
387 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
388 args.uid = current_fsuid();
389 if (inode->i_mode & S_ISGID)
390 args.gid = inode->i_gid;
391 else
392 args.gid = current_fsgid();
393 } else {
394 args.uid = INVALID_UID; /* no change */
395 args.gid = INVALID_GID; /* no change */
397 CIFSSMBUnixSetFileInfo(xid, tcon, &args, fid->netfid,
398 current->tgid);
399 } else {
401 * BB implement mode setting via Windows security
402 * descriptors e.g.
404 /* CIFSSMBWinSetPerms(xid,tcon,path,mode,-1,-1,nls);*/
406 /* Could set r/o dos attribute if mode & 0222 == 0 */
409 cifs_create_get_file_info:
410 /* server might mask mode so we have to query for it */
411 if (tcon->unix_ext)
412 rc = cifs_get_inode_info_unix(&newinode, full_path, inode->i_sb,
413 xid);
414 else {
415 /* TODO: Add support for calling POSIX query info here, but passing in fid */
416 rc = cifs_get_inode_info(&newinode, full_path, buf, inode->i_sb,
417 xid, fid);
418 if (newinode) {
419 if (server->ops->set_lease_key)
420 server->ops->set_lease_key(newinode, fid);
421 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
422 newinode->i_mode = mode;
423 if ((*oplock & CIFS_CREATE_ACTION) &&
424 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)) {
425 newinode->i_uid = current_fsuid();
426 if (inode->i_mode & S_ISGID)
427 newinode->i_gid = inode->i_gid;
428 else
429 newinode->i_gid = current_fsgid();
434 cifs_create_set_dentry:
435 if (rc != 0) {
436 cifs_dbg(FYI, "Create worked, get_inode_info failed rc = %d\n",
437 rc);
438 goto out_err;
441 if (S_ISDIR(newinode->i_mode)) {
442 rc = -EISDIR;
443 goto out_err;
446 d_drop(direntry);
447 d_add(direntry, newinode);
449 out:
450 kfree(buf);
451 kfree(full_path);
452 return rc;
454 out_err:
455 if (server->ops->close)
456 server->ops->close(xid, tcon, fid);
457 if (newinode)
458 iput(newinode);
459 goto out;
463 cifs_atomic_open(struct inode *inode, struct dentry *direntry,
464 struct file *file, unsigned oflags, umode_t mode)
466 int rc;
467 unsigned int xid;
468 struct tcon_link *tlink;
469 struct cifs_tcon *tcon;
470 struct TCP_Server_Info *server;
471 struct cifs_fid fid;
472 struct cifs_pending_open open;
473 __u32 oplock;
474 struct cifsFileInfo *file_info;
477 * Posix open is only called (at lookup time) for file create now. For
478 * opens (rather than creates), because we do not know if it is a file
479 * or directory yet, and current Samba no longer allows us to do posix
480 * open on dirs, we could end up wasting an open call on what turns out
481 * to be a dir. For file opens, we wait to call posix open till
482 * cifs_open. It could be added to atomic_open in the future but the
483 * performance tradeoff of the extra network request when EISDIR or
484 * EACCES is returned would have to be weighed against the 50% reduction
485 * in network traffic in the other paths.
487 if (!(oflags & O_CREAT)) {
488 struct dentry *res;
491 * Check for hashed negative dentry. We have already revalidated
492 * the dentry and it is fine. No need to perform another lookup.
494 if (!d_in_lookup(direntry))
495 return -ENOENT;
497 res = cifs_lookup(inode, direntry, 0);
498 if (IS_ERR(res))
499 return PTR_ERR(res);
501 return finish_no_open(file, res);
504 xid = get_xid();
506 cifs_dbg(FYI, "parent inode = 0x%p name is: %pd and dentry = 0x%p\n",
507 inode, direntry, direntry);
509 tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb));
510 if (IS_ERR(tlink)) {
511 rc = PTR_ERR(tlink);
512 goto out_free_xid;
515 tcon = tlink_tcon(tlink);
517 rc = check_name(direntry, tcon);
518 if (rc)
519 goto out;
521 server = tcon->ses->server;
523 if (server->ops->new_lease_key)
524 server->ops->new_lease_key(&fid);
526 cifs_add_pending_open(&fid, tlink, &open);
528 rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode,
529 &oplock, &fid);
531 if (rc) {
532 cifs_del_pending_open(&open);
533 goto out;
536 if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
537 file->f_mode |= FMODE_CREATED;
539 rc = finish_open(file, direntry, generic_file_open);
540 if (rc) {
541 if (server->ops->close)
542 server->ops->close(xid, tcon, &fid);
543 cifs_del_pending_open(&open);
544 goto out;
547 if (file->f_flags & O_DIRECT &&
548 CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) {
549 if (CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
550 file->f_op = &cifs_file_direct_nobrl_ops;
551 else
552 file->f_op = &cifs_file_direct_ops;
555 file_info = cifs_new_fileinfo(&fid, file, tlink, oplock);
556 if (file_info == NULL) {
557 if (server->ops->close)
558 server->ops->close(xid, tcon, &fid);
559 cifs_del_pending_open(&open);
560 rc = -ENOMEM;
563 out:
564 cifs_put_tlink(tlink);
565 out_free_xid:
566 free_xid(xid);
567 return rc;
570 int cifs_create(struct inode *inode, struct dentry *direntry, umode_t mode,
571 bool excl)
573 int rc;
574 unsigned int xid = get_xid();
576 * BB below access is probably too much for mknod to request
577 * but we have to do query and setpathinfo so requesting
578 * less could fail (unless we want to request getatr and setatr
579 * permissions (only). At least for POSIX we do not have to
580 * request so much.
582 unsigned oflags = O_EXCL | O_CREAT | O_RDWR;
583 struct tcon_link *tlink;
584 struct cifs_tcon *tcon;
585 struct TCP_Server_Info *server;
586 struct cifs_fid fid;
587 __u32 oplock;
589 cifs_dbg(FYI, "cifs_create parent inode = 0x%p name is: %pd and dentry = 0x%p\n",
590 inode, direntry, direntry);
592 tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb));
593 rc = PTR_ERR(tlink);
594 if (IS_ERR(tlink))
595 goto out_free_xid;
597 tcon = tlink_tcon(tlink);
598 server = tcon->ses->server;
600 if (server->ops->new_lease_key)
601 server->ops->new_lease_key(&fid);
603 rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode,
604 &oplock, &fid);
605 if (!rc && server->ops->close)
606 server->ops->close(xid, tcon, &fid);
608 cifs_put_tlink(tlink);
609 out_free_xid:
610 free_xid(xid);
611 return rc;
614 int cifs_mknod(struct inode *inode, struct dentry *direntry, umode_t mode,
615 dev_t device_number)
617 int rc = -EPERM;
618 unsigned int xid;
619 struct cifs_sb_info *cifs_sb;
620 struct tcon_link *tlink;
621 struct cifs_tcon *tcon;
622 char *full_path = NULL;
624 if (!old_valid_dev(device_number))
625 return -EINVAL;
627 cifs_sb = CIFS_SB(inode->i_sb);
628 tlink = cifs_sb_tlink(cifs_sb);
629 if (IS_ERR(tlink))
630 return PTR_ERR(tlink);
632 tcon = tlink_tcon(tlink);
634 xid = get_xid();
636 full_path = build_path_from_dentry(direntry);
637 if (full_path == NULL) {
638 rc = -ENOMEM;
639 goto mknod_out;
642 rc = tcon->ses->server->ops->make_node(xid, inode, direntry, tcon,
643 full_path, mode,
644 device_number);
646 mknod_out:
647 kfree(full_path);
648 free_xid(xid);
649 cifs_put_tlink(tlink);
650 return rc;
653 struct dentry *
654 cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
655 unsigned int flags)
657 unsigned int xid;
658 int rc = 0; /* to get around spurious gcc warning, set to zero here */
659 struct cifs_sb_info *cifs_sb;
660 struct tcon_link *tlink;
661 struct cifs_tcon *pTcon;
662 struct inode *newInode = NULL;
663 char *full_path = NULL;
665 xid = get_xid();
667 cifs_dbg(FYI, "parent inode = 0x%p name is: %pd and dentry = 0x%p\n",
668 parent_dir_inode, direntry, direntry);
670 /* check whether path exists */
672 cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
673 tlink = cifs_sb_tlink(cifs_sb);
674 if (IS_ERR(tlink)) {
675 free_xid(xid);
676 return ERR_CAST(tlink);
678 pTcon = tlink_tcon(tlink);
680 rc = check_name(direntry, pTcon);
681 if (unlikely(rc)) {
682 cifs_put_tlink(tlink);
683 free_xid(xid);
684 return ERR_PTR(rc);
687 /* can not grab the rename sem here since it would
688 deadlock in the cases (beginning of sys_rename itself)
689 in which we already have the sb rename sem */
690 full_path = build_path_from_dentry(direntry);
691 if (full_path == NULL) {
692 cifs_put_tlink(tlink);
693 free_xid(xid);
694 return ERR_PTR(-ENOMEM);
697 if (d_really_is_positive(direntry)) {
698 cifs_dbg(FYI, "non-NULL inode in lookup\n");
699 } else {
700 cifs_dbg(FYI, "NULL inode in lookup\n");
702 cifs_dbg(FYI, "Full path: %s inode = 0x%p\n",
703 full_path, d_inode(direntry));
705 if (pTcon->posix_extensions)
706 rc = smb311_posix_get_inode_info(&newInode, full_path, parent_dir_inode->i_sb, xid);
707 else if (pTcon->unix_ext) {
708 rc = cifs_get_inode_info_unix(&newInode, full_path,
709 parent_dir_inode->i_sb, xid);
710 } else {
711 rc = cifs_get_inode_info(&newInode, full_path, NULL,
712 parent_dir_inode->i_sb, xid, NULL);
715 if (rc == 0) {
716 /* since paths are not looked up by component - the parent
717 directories are presumed to be good here */
718 renew_parental_timestamps(direntry);
719 } else if (rc == -ENOENT) {
720 cifs_set_time(direntry, jiffies);
721 newInode = NULL;
722 } else {
723 if (rc != -EACCES) {
724 cifs_dbg(FYI, "Unexpected lookup error %d\n", rc);
725 /* We special case check for Access Denied - since that
726 is a common return code */
728 newInode = ERR_PTR(rc);
730 kfree(full_path);
731 cifs_put_tlink(tlink);
732 free_xid(xid);
733 return d_splice_alias(newInode, direntry);
736 static int
737 cifs_d_revalidate(struct dentry *direntry, unsigned int flags)
739 struct inode *inode;
741 if (flags & LOOKUP_RCU)
742 return -ECHILD;
744 if (d_really_is_positive(direntry)) {
745 inode = d_inode(direntry);
746 if ((flags & LOOKUP_REVAL) && !CIFS_CACHE_READ(CIFS_I(inode)))
747 CIFS_I(inode)->time = 0; /* force reval */
749 if (cifs_revalidate_dentry(direntry))
750 return 0;
751 else {
753 * If the inode wasn't known to be a dfs entry when
754 * the dentry was instantiated, such as when created
755 * via ->readdir(), it needs to be set now since the
756 * attributes will have been updated by
757 * cifs_revalidate_dentry().
759 if (IS_AUTOMOUNT(inode) &&
760 !(direntry->d_flags & DCACHE_NEED_AUTOMOUNT)) {
761 spin_lock(&direntry->d_lock);
762 direntry->d_flags |= DCACHE_NEED_AUTOMOUNT;
763 spin_unlock(&direntry->d_lock);
766 return 1;
771 * This may be nfsd (or something), anyway, we can't see the
772 * intent of this. So, since this can be for creation, drop it.
774 if (!flags)
775 return 0;
778 * Drop the negative dentry, in order to make sure to use the
779 * case sensitive name which is specified by user if this is
780 * for creation.
782 if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
783 return 0;
785 if (time_after(jiffies, cifs_get_time(direntry) + HZ) || !lookupCacheEnabled)
786 return 0;
788 return 1;
791 /* static int cifs_d_delete(struct dentry *direntry)
793 int rc = 0;
795 cifs_dbg(FYI, "In cifs d_delete, name = %pd\n", direntry);
797 return rc;
798 } */
800 const struct dentry_operations cifs_dentry_ops = {
801 .d_revalidate = cifs_d_revalidate,
802 .d_automount = cifs_dfs_d_automount,
803 /* d_delete: cifs_d_delete, */ /* not needed except for debugging */
806 static int cifs_ci_hash(const struct dentry *dentry, struct qstr *q)
808 struct nls_table *codepage = CIFS_SB(dentry->d_sb)->local_nls;
809 unsigned long hash;
810 wchar_t c;
811 int i, charlen;
813 hash = init_name_hash(dentry);
814 for (i = 0; i < q->len; i += charlen) {
815 charlen = codepage->char2uni(&q->name[i], q->len - i, &c);
816 /* error out if we can't convert the character */
817 if (unlikely(charlen < 0))
818 return charlen;
819 hash = partial_name_hash(cifs_toupper(c), hash);
821 q->hash = end_name_hash(hash);
823 return 0;
826 static int cifs_ci_compare(const struct dentry *dentry,
827 unsigned int len, const char *str, const struct qstr *name)
829 struct nls_table *codepage = CIFS_SB(dentry->d_sb)->local_nls;
830 wchar_t c1, c2;
831 int i, l1, l2;
834 * We make the assumption here that uppercase characters in the local
835 * codepage are always the same length as their lowercase counterparts.
837 * If that's ever not the case, then this will fail to match it.
839 if (name->len != len)
840 return 1;
842 for (i = 0; i < len; i += l1) {
843 /* Convert characters in both strings to UTF-16. */
844 l1 = codepage->char2uni(&str[i], len - i, &c1);
845 l2 = codepage->char2uni(&name->name[i], name->len - i, &c2);
848 * If we can't convert either character, just declare it to
849 * be 1 byte long and compare the original byte.
851 if (unlikely(l1 < 0 && l2 < 0)) {
852 if (str[i] != name->name[i])
853 return 1;
854 l1 = 1;
855 continue;
859 * Here, we again ass|u|me that upper/lowercase versions of
860 * a character are the same length in the local NLS.
862 if (l1 != l2)
863 return 1;
865 /* Now compare uppercase versions of these characters */
866 if (cifs_toupper(c1) != cifs_toupper(c2))
867 return 1;
870 return 0;
873 const struct dentry_operations cifs_ci_dentry_ops = {
874 .d_revalidate = cifs_d_revalidate,
875 .d_hash = cifs_ci_hash,
876 .d_compare = cifs_ci_compare,
877 .d_automount = cifs_dfs_d_automount,