Merge branch 'fix' of git://git.kernel.org/pub/scm/linux/kernel/git/ycmiao/pxa-linux-2.6
[linux-2.6] / fs / cifs / readdir.c
1 /*
2  *   fs/cifs/readdir.c
3  *
4  *   Directory search handling
5  *
6  *   Copyright (C) International Business Machines  Corp., 2004, 2008
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/pagemap.h>
25 #include <linux/stat.h>
26 #include "cifspdu.h"
27 #include "cifsglob.h"
28 #include "cifsproto.h"
29 #include "cifs_unicode.h"
30 #include "cifs_debug.h"
31 #include "cifs_fs_sb.h"
32 #include "cifsfs.h"
33
34 #ifdef CONFIG_CIFS_DEBUG2
35 static void dump_cifs_file_struct(struct file *file, char *label)
36 {
37         struct cifsFileInfo *cf;
38
39         if (file) {
40                 cf = file->private_data;
41                 if (cf == NULL) {
42                         cFYI(1, ("empty cifs private file data"));
43                         return;
44                 }
45                 if (cf->invalidHandle)
46                         cFYI(1, ("invalid handle"));
47                 if (cf->srch_inf.endOfSearch)
48                         cFYI(1, ("end of search"));
49                 if (cf->srch_inf.emptyDir)
50                         cFYI(1, ("empty dir"));
51         }
52 }
53 #else
54 static inline void dump_cifs_file_struct(struct file *file, char *label)
55 {
56 }
57 #endif /* DEBUG2 */
58
59 /* Returns 1 if new inode created, 2 if both dentry and inode were */
60 /* Might check in the future if inode number changed so we can rehash inode */
61 static int
62 construct_dentry(struct qstr *qstring, struct file *file,
63                  struct inode **ptmp_inode, struct dentry **pnew_dentry,
64                  __u64 *inum)
65 {
66         struct dentry *tmp_dentry = NULL;
67         struct super_block *sb = file->f_path.dentry->d_sb;
68         int rc = 0;
69
70         cFYI(1, ("For %s", qstring->name));
71
72         qstring->hash = full_name_hash(qstring->name, qstring->len);
73         tmp_dentry = d_lookup(file->f_path.dentry, qstring);
74         if (tmp_dentry) {
75                 /* BB: overwrite old name? i.e. tmp_dentry->d_name and
76                  * tmp_dentry->d_name.len??
77                  */
78                 cFYI(0, ("existing dentry with inode 0x%p",
79                          tmp_dentry->d_inode));
80                 *ptmp_inode = tmp_dentry->d_inode;
81                 if (*ptmp_inode == NULL) {
82                         *ptmp_inode = cifs_new_inode(sb, inum);
83                         if (*ptmp_inode == NULL)
84                                 return rc;
85                         rc = 1;
86                 }
87         } else {
88                 tmp_dentry = d_alloc(file->f_path.dentry, qstring);
89                 if (tmp_dentry == NULL) {
90                         cERROR(1, ("Failed allocating dentry"));
91                         *ptmp_inode = NULL;
92                         return rc;
93                 }
94
95                 if (CIFS_SB(sb)->tcon->nocase)
96                         tmp_dentry->d_op = &cifs_ci_dentry_ops;
97                 else
98                         tmp_dentry->d_op = &cifs_dentry_ops;
99
100                 *ptmp_inode = cifs_new_inode(sb, inum);
101                 if (*ptmp_inode == NULL)
102                         return rc;
103                 rc = 2;
104         }
105
106         tmp_dentry->d_time = jiffies;
107         *pnew_dentry = tmp_dentry;
108         return rc;
109 }
110
111 static void AdjustForTZ(struct cifsTconInfo *tcon, struct inode *inode)
112 {
113         if ((tcon) && (tcon->ses) && (tcon->ses->server)) {
114                 inode->i_ctime.tv_sec += tcon->ses->server->timeAdj;
115                 inode->i_mtime.tv_sec += tcon->ses->server->timeAdj;
116                 inode->i_atime.tv_sec += tcon->ses->server->timeAdj;
117         }
118         return;
119 }
120
121
122 static void fill_in_inode(struct inode *tmp_inode, int new_buf_type,
123                           char *buf, unsigned int *pobject_type, int isNewInode)
124 {
125         loff_t local_size;
126         struct timespec local_mtime;
127
128         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
129         struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
130         __u32 attr;
131         __u64 allocation_size;
132         __u64 end_of_file;
133         umode_t default_mode;
134
135         /* save mtime and size */
136         local_mtime = tmp_inode->i_mtime;
137         local_size  = tmp_inode->i_size;
138
139         if (new_buf_type) {
140                 FILE_DIRECTORY_INFO *pfindData = (FILE_DIRECTORY_INFO *)buf;
141
142                 attr = le32_to_cpu(pfindData->ExtFileAttributes);
143                 allocation_size = le64_to_cpu(pfindData->AllocationSize);
144                 end_of_file = le64_to_cpu(pfindData->EndOfFile);
145                 tmp_inode->i_atime =
146                       cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
147                 tmp_inode->i_mtime =
148                       cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
149                 tmp_inode->i_ctime =
150                       cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
151         } else { /* legacy, OS2 and DOS style */
152 /*              struct timespec ts;*/
153                 FIND_FILE_STANDARD_INFO *pfindData =
154                         (FIND_FILE_STANDARD_INFO *)buf;
155
156                 tmp_inode->i_mtime = cnvrtDosUnixTm(
157                                 le16_to_cpu(pfindData->LastWriteDate),
158                                 le16_to_cpu(pfindData->LastWriteTime));
159                 tmp_inode->i_atime = cnvrtDosUnixTm(
160                                 le16_to_cpu(pfindData->LastAccessDate),
161                                 le16_to_cpu(pfindData->LastAccessTime));
162                 tmp_inode->i_ctime = cnvrtDosUnixTm(
163                                 le16_to_cpu(pfindData->LastWriteDate),
164                                 le16_to_cpu(pfindData->LastWriteTime));
165                 AdjustForTZ(cifs_sb->tcon, tmp_inode);
166                 attr = le16_to_cpu(pfindData->Attributes);
167                 allocation_size = le32_to_cpu(pfindData->AllocationSize);
168                 end_of_file = le32_to_cpu(pfindData->DataSize);
169         }
170
171         /* Linux can not store file creation time unfortunately so ignore it */
172
173         cifsInfo->cifsAttrs = attr;
174 #ifdef CONFIG_CIFS_EXPERIMENTAL
175         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
176                 /* get more accurate mode via ACL - so force inode refresh */
177                 cifsInfo->time = 0;
178         } else
179 #endif /* CONFIG_CIFS_EXPERIMENTAL */
180                 cifsInfo->time = jiffies;
181
182         /* treat dos attribute of read-only as read-only mode bit e.g. 555? */
183         /* 2767 perms - indicate mandatory locking */
184                 /* BB fill in uid and gid here? with help from winbind?
185                    or retrieve from NTFS stream extended attribute */
186         if (atomic_read(&cifsInfo->inUse) == 0) {
187                 tmp_inode->i_uid = cifs_sb->mnt_uid;
188                 tmp_inode->i_gid = cifs_sb->mnt_gid;
189         }
190
191         if (attr & ATTR_DIRECTORY)
192                 default_mode = cifs_sb->mnt_dir_mode;
193         else
194                 default_mode = cifs_sb->mnt_file_mode;
195
196         /* set initial permissions */
197         if ((atomic_read(&cifsInfo->inUse) == 0) ||
198             (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0)
199                 tmp_inode->i_mode = default_mode;
200         else {
201                 /* just reenable write bits if !ATTR_READONLY */
202                 if ((tmp_inode->i_mode & S_IWUGO) == 0 &&
203                     (attr & ATTR_READONLY) == 0)
204                         tmp_inode->i_mode |= (S_IWUGO & default_mode);
205
206                 tmp_inode->i_mode &= ~S_IFMT;
207         }
208
209         /* clear write bits if ATTR_READONLY is set */
210         if (attr & ATTR_READONLY)
211                 tmp_inode->i_mode &= ~S_IWUGO;
212
213         /* set inode type */
214         if ((attr & ATTR_SYSTEM) &&
215             (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)) {
216                 if (end_of_file == 0)  {
217                         tmp_inode->i_mode |= S_IFIFO;
218                         *pobject_type = DT_FIFO;
219                 } else {
220                         /*
221                          * trying to get the type can be slow, so just call
222                          * this a regular file for now, and mark for reval
223                          */
224                         tmp_inode->i_mode |= S_IFREG;
225                         *pobject_type = DT_REG;
226                         cifsInfo->time = 0;
227                 }
228         } else {
229                 if (attr & ATTR_DIRECTORY) {
230                         tmp_inode->i_mode |= S_IFDIR;
231                         *pobject_type = DT_DIR;
232                 } else {
233                         tmp_inode->i_mode |= S_IFREG;
234                         *pobject_type = DT_REG;
235                 }
236         }
237
238         /* can not fill in nlink here as in qpathinfo version and Unx search */
239         if (atomic_read(&cifsInfo->inUse) == 0)
240                 atomic_set(&cifsInfo->inUse, 1);
241
242         cifsInfo->server_eof = end_of_file;
243         spin_lock(&tmp_inode->i_lock);
244         if (is_size_safe_to_change(cifsInfo, end_of_file)) {
245                 /* can not safely change the file size here if the
246                 client is writing to it due to potential races */
247                 i_size_write(tmp_inode, end_of_file);
248
249         /* 512 bytes (2**9) is the fake blocksize that must be used */
250         /* for this calculation, even though the reported blocksize is larger */
251                 tmp_inode->i_blocks = (512 - 1 + allocation_size) >> 9;
252         }
253         spin_unlock(&tmp_inode->i_lock);
254
255         if (allocation_size < end_of_file)
256                 cFYI(1, ("May be sparse file, allocation less than file size"));
257         cFYI(1, ("File Size %ld and blocks %llu",
258                 (unsigned long)tmp_inode->i_size,
259                 (unsigned long long)tmp_inode->i_blocks));
260         if (S_ISREG(tmp_inode->i_mode)) {
261                 cFYI(1, ("File inode"));
262                 tmp_inode->i_op = &cifs_file_inode_ops;
263                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
264                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
265                                 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
266                         else
267                                 tmp_inode->i_fop = &cifs_file_direct_ops;
268                 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
269                         tmp_inode->i_fop = &cifs_file_nobrl_ops;
270                 else
271                         tmp_inode->i_fop = &cifs_file_ops;
272
273                 if ((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
274                    (cifs_sb->tcon->ses->server->maxBuf <
275                         PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
276                         tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
277                 else
278                         tmp_inode->i_data.a_ops = &cifs_addr_ops;
279
280                 if (isNewInode)
281                         return; /* No sense invalidating pages for new inode
282                                    since have not started caching readahead file
283                                    data yet */
284
285                 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
286                         (local_size == tmp_inode->i_size)) {
287                         cFYI(1, ("inode exists but unchanged"));
288                 } else {
289                         /* file may have changed on server */
290                         cFYI(1, ("invalidate inode, readdir detected change"));
291                         invalidate_remote_inode(tmp_inode);
292                 }
293         } else if (S_ISDIR(tmp_inode->i_mode)) {
294                 cFYI(1, ("Directory inode"));
295                 tmp_inode->i_op = &cifs_dir_inode_ops;
296                 tmp_inode->i_fop = &cifs_dir_ops;
297         } else if (S_ISLNK(tmp_inode->i_mode)) {
298                 cFYI(1, ("Symbolic Link inode"));
299                 tmp_inode->i_op = &cifs_symlink_inode_ops;
300         } else {
301                 cFYI(1, ("Init special inode"));
302                 init_special_inode(tmp_inode, tmp_inode->i_mode,
303                                    tmp_inode->i_rdev);
304         }
305 }
306
307 static void unix_fill_in_inode(struct inode *tmp_inode,
308         FILE_UNIX_INFO *pfindData, unsigned int *pobject_type, int isNewInode)
309 {
310         loff_t local_size;
311         struct timespec local_mtime;
312
313         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
314         struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
315
316         __u32 type = le32_to_cpu(pfindData->Type);
317         __u64 num_of_bytes = le64_to_cpu(pfindData->NumOfBytes);
318         __u64 end_of_file = le64_to_cpu(pfindData->EndOfFile);
319         cifsInfo->time = jiffies;
320         atomic_inc(&cifsInfo->inUse);
321
322         /* save mtime and size */
323         local_mtime = tmp_inode->i_mtime;
324         local_size  = tmp_inode->i_size;
325
326         tmp_inode->i_atime =
327             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
328         tmp_inode->i_mtime =
329             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastModificationTime));
330         tmp_inode->i_ctime =
331             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastStatusChange));
332
333         tmp_inode->i_mode = le64_to_cpu(pfindData->Permissions);
334         /* since we set the inode type below we need to mask off type
335            to avoid strange results if bits above were corrupt */
336         tmp_inode->i_mode &= ~S_IFMT;
337         if (type == UNIX_FILE) {
338                 *pobject_type = DT_REG;
339                 tmp_inode->i_mode |= S_IFREG;
340         } else if (type == UNIX_SYMLINK) {
341                 *pobject_type = DT_LNK;
342                 tmp_inode->i_mode |= S_IFLNK;
343         } else if (type == UNIX_DIR) {
344                 *pobject_type = DT_DIR;
345                 tmp_inode->i_mode |= S_IFDIR;
346         } else if (type == UNIX_CHARDEV) {
347                 *pobject_type = DT_CHR;
348                 tmp_inode->i_mode |= S_IFCHR;
349                 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
350                                 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
351         } else if (type == UNIX_BLOCKDEV) {
352                 *pobject_type = DT_BLK;
353                 tmp_inode->i_mode |= S_IFBLK;
354                 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
355                                 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
356         } else if (type == UNIX_FIFO) {
357                 *pobject_type = DT_FIFO;
358                 tmp_inode->i_mode |= S_IFIFO;
359         } else if (type == UNIX_SOCKET) {
360                 *pobject_type = DT_SOCK;
361                 tmp_inode->i_mode |= S_IFSOCK;
362         } else {
363                 /* safest to just call it a file */
364                 *pobject_type = DT_REG;
365                 tmp_inode->i_mode |= S_IFREG;
366                 cFYI(1, ("unknown inode type %d", type));
367         }
368
369         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
370                 tmp_inode->i_uid = cifs_sb->mnt_uid;
371         else
372                 tmp_inode->i_uid = le64_to_cpu(pfindData->Uid);
373         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
374                 tmp_inode->i_gid = cifs_sb->mnt_gid;
375         else
376                 tmp_inode->i_gid = le64_to_cpu(pfindData->Gid);
377         tmp_inode->i_nlink = le64_to_cpu(pfindData->Nlinks);
378
379         cifsInfo->server_eof = end_of_file;
380         spin_lock(&tmp_inode->i_lock);
381         if (is_size_safe_to_change(cifsInfo, end_of_file)) {
382                 /* can not safely change the file size here if the
383                 client is writing to it due to potential races */
384                 i_size_write(tmp_inode, end_of_file);
385
386         /* 512 bytes (2**9) is the fake blocksize that must be used */
387         /* for this calculation, not the real blocksize */
388                 tmp_inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
389         }
390         spin_unlock(&tmp_inode->i_lock);
391
392         if (S_ISREG(tmp_inode->i_mode)) {
393                 cFYI(1, ("File inode"));
394                 tmp_inode->i_op = &cifs_file_inode_ops;
395
396                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
397                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
398                                 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
399                         else
400                                 tmp_inode->i_fop = &cifs_file_direct_ops;
401                 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
402                         tmp_inode->i_fop = &cifs_file_nobrl_ops;
403                 else
404                         tmp_inode->i_fop = &cifs_file_ops;
405
406                 if ((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
407                    (cifs_sb->tcon->ses->server->maxBuf <
408                         PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
409                         tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
410                 else
411                         tmp_inode->i_data.a_ops = &cifs_addr_ops;
412
413                 if (isNewInode)
414                         return; /* No sense invalidating pages for new inode
415                                    since we have not started caching readahead
416                                    file data for it yet */
417
418                 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
419                         (local_size == tmp_inode->i_size)) {
420                         cFYI(1, ("inode exists but unchanged"));
421                 } else {
422                         /* file may have changed on server */
423                         cFYI(1, ("invalidate inode, readdir detected change"));
424                         invalidate_remote_inode(tmp_inode);
425                 }
426         } else if (S_ISDIR(tmp_inode->i_mode)) {
427                 cFYI(1, ("Directory inode"));
428                 tmp_inode->i_op = &cifs_dir_inode_ops;
429                 tmp_inode->i_fop = &cifs_dir_ops;
430         } else if (S_ISLNK(tmp_inode->i_mode)) {
431                 cFYI(1, ("Symbolic Link inode"));
432                 tmp_inode->i_op = &cifs_symlink_inode_ops;
433 /* tmp_inode->i_fop = *//* do not need to set to anything */
434         } else {
435                 cFYI(1, ("Special inode"));
436                 init_special_inode(tmp_inode, tmp_inode->i_mode,
437                                    tmp_inode->i_rdev);
438         }
439 }
440
441 static int initiate_cifs_search(const int xid, struct file *file)
442 {
443         int rc = 0;
444         char *full_path;
445         struct cifsFileInfo *cifsFile;
446         struct cifs_sb_info *cifs_sb;
447         struct cifsTconInfo *pTcon;
448
449         if (file->private_data == NULL) {
450                 file->private_data =
451                         kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
452         }
453
454         if (file->private_data == NULL)
455                 return -ENOMEM;
456         cifsFile = file->private_data;
457         cifsFile->invalidHandle = true;
458         cifsFile->srch_inf.endOfSearch = false;
459
460         cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
461         if (cifs_sb == NULL)
462                 return -EINVAL;
463
464         pTcon = cifs_sb->tcon;
465         if (pTcon == NULL)
466                 return -EINVAL;
467
468         full_path = build_path_from_dentry(file->f_path.dentry);
469
470         if (full_path == NULL)
471                 return -ENOMEM;
472
473         cFYI(1, ("Full path: %s start at: %lld", full_path, file->f_pos));
474
475 ffirst_retry:
476         /* test for Unix extensions */
477         /* but now check for them on the share/mount not on the SMB session */
478 /*      if (pTcon->ses->capabilities & CAP_UNIX) { */
479         if (pTcon->unix_ext)
480                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
481         else if ((pTcon->ses->capabilities &
482                         (CAP_NT_SMBS | CAP_NT_FIND)) == 0) {
483                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD;
484         } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
485                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
486         } else /* not srvinos - BB fixme add check for backlevel? */ {
487                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
488         }
489
490         rc = CIFSFindFirst(xid, pTcon, full_path, cifs_sb->local_nls,
491                 &cifsFile->netfid, &cifsFile->srch_inf,
492                 cifs_sb->mnt_cifs_flags &
493                         CIFS_MOUNT_MAP_SPECIAL_CHR, CIFS_DIR_SEP(cifs_sb));
494         if (rc == 0)
495                 cifsFile->invalidHandle = false;
496         if ((rc == -EOPNOTSUPP) &&
497                 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
498                 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
499                 goto ffirst_retry;
500         }
501         kfree(full_path);
502         return rc;
503 }
504
505 /* return length of unicode string in bytes */
506 static int cifs_unicode_bytelen(char *str)
507 {
508         int len;
509         __le16 *ustr = (__le16 *)str;
510
511         for (len = 0; len <= PATH_MAX; len++) {
512                 if (ustr[len] == 0)
513                         return len << 1;
514         }
515         cFYI(1, ("Unicode string longer than PATH_MAX found"));
516         return len << 1;
517 }
518
519 static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level)
520 {
521         char *new_entry;
522         FILE_DIRECTORY_INFO *pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
523
524         if (level == SMB_FIND_FILE_INFO_STANDARD) {
525                 FIND_FILE_STANDARD_INFO *pfData;
526                 pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo;
527
528                 new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) +
529                                 pfData->FileNameLength;
530         } else
531                 new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
532         cFYI(1, ("new entry %p old entry %p", new_entry, old_entry));
533         /* validate that new_entry is not past end of SMB */
534         if (new_entry >= end_of_smb) {
535                 cERROR(1,
536                       ("search entry %p began after end of SMB %p old entry %p",
537                         new_entry, end_of_smb, old_entry));
538                 return NULL;
539         } else if (((level == SMB_FIND_FILE_INFO_STANDARD) &&
540                     (new_entry + sizeof(FIND_FILE_STANDARD_INFO) > end_of_smb))
541                   || ((level != SMB_FIND_FILE_INFO_STANDARD) &&
542                    (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb)))  {
543                 cERROR(1, ("search entry %p extends after end of SMB %p",
544                         new_entry, end_of_smb));
545                 return NULL;
546         } else
547                 return new_entry;
548
549 }
550
551 #define UNICODE_DOT cpu_to_le16(0x2e)
552
553 /* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
554 static int cifs_entry_is_dot(char *current_entry, struct cifsFileInfo *cfile)
555 {
556         int rc = 0;
557         char *filename = NULL;
558         int len = 0;
559
560         if (cfile->srch_inf.info_level == SMB_FIND_FILE_UNIX) {
561                 FILE_UNIX_INFO *pFindData = (FILE_UNIX_INFO *)current_entry;
562                 filename = &pFindData->FileName[0];
563                 if (cfile->srch_inf.unicode) {
564                         len = cifs_unicode_bytelen(filename);
565                 } else {
566                         /* BB should we make this strnlen of PATH_MAX? */
567                         len = strnlen(filename, 5);
568                 }
569         } else if (cfile->srch_inf.info_level == SMB_FIND_FILE_DIRECTORY_INFO) {
570                 FILE_DIRECTORY_INFO *pFindData =
571                         (FILE_DIRECTORY_INFO *)current_entry;
572                 filename = &pFindData->FileName[0];
573                 len = le32_to_cpu(pFindData->FileNameLength);
574         } else if (cfile->srch_inf.info_level ==
575                         SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
576                 FILE_FULL_DIRECTORY_INFO *pFindData =
577                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
578                 filename = &pFindData->FileName[0];
579                 len = le32_to_cpu(pFindData->FileNameLength);
580         } else if (cfile->srch_inf.info_level ==
581                         SMB_FIND_FILE_ID_FULL_DIR_INFO) {
582                 SEARCH_ID_FULL_DIR_INFO *pFindData =
583                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
584                 filename = &pFindData->FileName[0];
585                 len = le32_to_cpu(pFindData->FileNameLength);
586         } else if (cfile->srch_inf.info_level ==
587                         SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
588                 FILE_BOTH_DIRECTORY_INFO *pFindData =
589                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
590                 filename = &pFindData->FileName[0];
591                 len = le32_to_cpu(pFindData->FileNameLength);
592         } else if (cfile->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD) {
593                 FIND_FILE_STANDARD_INFO *pFindData =
594                         (FIND_FILE_STANDARD_INFO *)current_entry;
595                 filename = &pFindData->FileName[0];
596                 len = pFindData->FileNameLength;
597         } else {
598                 cFYI(1, ("Unknown findfirst level %d",
599                          cfile->srch_inf.info_level));
600         }
601
602         if (filename) {
603                 if (cfile->srch_inf.unicode) {
604                         __le16 *ufilename = (__le16 *)filename;
605                         if (len == 2) {
606                                 /* check for . */
607                                 if (ufilename[0] == UNICODE_DOT)
608                                         rc = 1;
609                         } else if (len == 4) {
610                                 /* check for .. */
611                                 if ((ufilename[0] == UNICODE_DOT)
612                                    && (ufilename[1] == UNICODE_DOT))
613                                         rc = 2;
614                         }
615                 } else /* ASCII */ {
616                         if (len == 1) {
617                                 if (filename[0] == '.')
618                                         rc = 1;
619                         } else if (len == 2) {
620                                 if ((filename[0] == '.') && (filename[1] == '.'))
621                                         rc = 2;
622                         }
623                 }
624         }
625
626         return rc;
627 }
628
629 /* Check if directory that we are searching has changed so we can decide
630    whether we can use the cached search results from the previous search */
631 static int is_dir_changed(struct file *file)
632 {
633         struct inode *inode = file->f_path.dentry->d_inode;
634         struct cifsInodeInfo *cifsInfo = CIFS_I(inode);
635
636         if (cifsInfo->time == 0)
637                 return 1; /* directory was changed, perhaps due to unlink */
638         else
639                 return 0;
640
641 }
642
643 static int cifs_save_resume_key(const char *current_entry,
644         struct cifsFileInfo *cifsFile)
645 {
646         int rc = 0;
647         unsigned int len = 0;
648         __u16 level;
649         char *filename;
650
651         if ((cifsFile == NULL) || (current_entry == NULL))
652                 return -EINVAL;
653
654         level = cifsFile->srch_inf.info_level;
655
656         if (level == SMB_FIND_FILE_UNIX) {
657                 FILE_UNIX_INFO *pFindData = (FILE_UNIX_INFO *)current_entry;
658
659                 filename = &pFindData->FileName[0];
660                 if (cifsFile->srch_inf.unicode) {
661                         len = cifs_unicode_bytelen(filename);
662                 } else {
663                         /* BB should we make this strnlen of PATH_MAX? */
664                         len = strnlen(filename, PATH_MAX);
665                 }
666                 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
667         } else if (level == SMB_FIND_FILE_DIRECTORY_INFO) {
668                 FILE_DIRECTORY_INFO *pFindData =
669                         (FILE_DIRECTORY_INFO *)current_entry;
670                 filename = &pFindData->FileName[0];
671                 len = le32_to_cpu(pFindData->FileNameLength);
672                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
673         } else if (level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
674                 FILE_FULL_DIRECTORY_INFO *pFindData =
675                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
676                 filename = &pFindData->FileName[0];
677                 len = le32_to_cpu(pFindData->FileNameLength);
678                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
679         } else if (level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
680                 SEARCH_ID_FULL_DIR_INFO *pFindData =
681                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
682                 filename = &pFindData->FileName[0];
683                 len = le32_to_cpu(pFindData->FileNameLength);
684                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
685         } else if (level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
686                 FILE_BOTH_DIRECTORY_INFO *pFindData =
687                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
688                 filename = &pFindData->FileName[0];
689                 len = le32_to_cpu(pFindData->FileNameLength);
690                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
691         } else if (level == SMB_FIND_FILE_INFO_STANDARD) {
692                 FIND_FILE_STANDARD_INFO *pFindData =
693                         (FIND_FILE_STANDARD_INFO *)current_entry;
694                 filename = &pFindData->FileName[0];
695                 /* one byte length, no name conversion */
696                 len = (unsigned int)pFindData->FileNameLength;
697                 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
698         } else {
699                 cFYI(1, ("Unknown findfirst level %d", level));
700                 return -EINVAL;
701         }
702         cifsFile->srch_inf.resume_name_len = len;
703         cifsFile->srch_inf.presume_name = filename;
704         return rc;
705 }
706
707 /* find the corresponding entry in the search */
708 /* Note that the SMB server returns search entries for . and .. which
709    complicates logic here if we choose to parse for them and we do not
710    assume that they are located in the findfirst return buffer.*/
711 /* We start counting in the buffer with entry 2 and increment for every
712    entry (do not increment for . or .. entry) */
713 static int find_cifs_entry(const int xid, struct cifsTconInfo *pTcon,
714         struct file *file, char **ppCurrentEntry, int *num_to_ret)
715 {
716         int rc = 0;
717         int pos_in_buf = 0;
718         loff_t first_entry_in_buffer;
719         loff_t index_to_find = file->f_pos;
720         struct cifsFileInfo *cifsFile = file->private_data;
721         /* check if index in the buffer */
722
723         if ((cifsFile == NULL) || (ppCurrentEntry == NULL) ||
724            (num_to_ret == NULL))
725                 return -ENOENT;
726
727         *ppCurrentEntry = NULL;
728         first_entry_in_buffer =
729                 cifsFile->srch_inf.index_of_last_entry -
730                         cifsFile->srch_inf.entries_in_buffer;
731
732         /* if first entry in buf is zero then is first buffer
733         in search response data which means it is likely . and ..
734         will be in this buffer, although some servers do not return
735         . and .. for the root of a drive and for those we need
736         to start two entries earlier */
737
738         dump_cifs_file_struct(file, "In fce ");
739         if (((index_to_find < cifsFile->srch_inf.index_of_last_entry) &&
740              is_dir_changed(file)) ||
741            (index_to_find < first_entry_in_buffer)) {
742                 /* close and restart search */
743                 cFYI(1, ("search backing up - close and restart search"));
744                 write_lock(&GlobalSMBSeslock);
745                 if (!cifsFile->srch_inf.endOfSearch &&
746                     !cifsFile->invalidHandle) {
747                         cifsFile->invalidHandle = true;
748                         write_unlock(&GlobalSMBSeslock);
749                         CIFSFindClose(xid, pTcon, cifsFile->netfid);
750                 } else
751                         write_unlock(&GlobalSMBSeslock);
752                 if (cifsFile->srch_inf.ntwrk_buf_start) {
753                         cFYI(1, ("freeing SMB ff cache buf on search rewind"));
754                         if (cifsFile->srch_inf.smallBuf)
755                                 cifs_small_buf_release(cifsFile->srch_inf.
756                                                 ntwrk_buf_start);
757                         else
758                                 cifs_buf_release(cifsFile->srch_inf.
759                                                 ntwrk_buf_start);
760                         cifsFile->srch_inf.ntwrk_buf_start = NULL;
761                 }
762                 rc = initiate_cifs_search(xid, file);
763                 if (rc) {
764                         cFYI(1, ("error %d reinitiating a search on rewind",
765                                  rc));
766                         return rc;
767                 }
768                 cifs_save_resume_key(cifsFile->srch_inf.last_entry, cifsFile);
769         }
770
771         while ((index_to_find >= cifsFile->srch_inf.index_of_last_entry) &&
772               (rc == 0) && !cifsFile->srch_inf.endOfSearch) {
773                 cFYI(1, ("calling findnext2"));
774                 rc = CIFSFindNext(xid, pTcon, cifsFile->netfid,
775                                   &cifsFile->srch_inf);
776                 cifs_save_resume_key(cifsFile->srch_inf.last_entry, cifsFile);
777                 if (rc)
778                         return -ENOENT;
779         }
780         if (index_to_find < cifsFile->srch_inf.index_of_last_entry) {
781                 /* we found the buffer that contains the entry */
782                 /* scan and find it */
783                 int i;
784                 char *current_entry;
785                 char *end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
786                         smbCalcSize((struct smb_hdr *)
787                                 cifsFile->srch_inf.ntwrk_buf_start);
788
789                 current_entry = cifsFile->srch_inf.srch_entries_start;
790                 first_entry_in_buffer = cifsFile->srch_inf.index_of_last_entry
791                                         - cifsFile->srch_inf.entries_in_buffer;
792                 pos_in_buf = index_to_find - first_entry_in_buffer;
793                 cFYI(1, ("found entry - pos_in_buf %d", pos_in_buf));
794
795                 for (i = 0; (i < (pos_in_buf)) && (current_entry != NULL); i++) {
796                         /* go entry by entry figuring out which is first */
797                         current_entry = nxt_dir_entry(current_entry, end_of_smb,
798                                                 cifsFile->srch_inf.info_level);
799                 }
800                 if ((current_entry == NULL) && (i < pos_in_buf)) {
801                         /* BB fixme - check if we should flag this error */
802                         cERROR(1, ("reached end of buf searching for pos in buf"
803                           " %d index to find %lld rc %d",
804                           pos_in_buf, index_to_find, rc));
805                 }
806                 rc = 0;
807                 *ppCurrentEntry = current_entry;
808         } else {
809                 cFYI(1, ("index not in buffer - could not findnext into it"));
810                 return 0;
811         }
812
813         if (pos_in_buf >= cifsFile->srch_inf.entries_in_buffer) {
814                 cFYI(1, ("can not return entries pos_in_buf beyond last"));
815                 *num_to_ret = 0;
816         } else
817                 *num_to_ret = cifsFile->srch_inf.entries_in_buffer - pos_in_buf;
818
819         return rc;
820 }
821
822 /* inode num, inode type and filename returned */
823 static int cifs_get_name_from_search_buf(struct qstr *pqst,
824         char *current_entry, __u16 level, unsigned int unicode,
825         struct cifs_sb_info *cifs_sb, int max_len, __u64 *pinum)
826 {
827         int rc = 0;
828         unsigned int len = 0;
829         char *filename;
830         struct nls_table *nlt = cifs_sb->local_nls;
831
832         *pinum = 0;
833
834         if (level == SMB_FIND_FILE_UNIX) {
835                 FILE_UNIX_INFO *pFindData = (FILE_UNIX_INFO *)current_entry;
836
837                 filename = &pFindData->FileName[0];
838                 if (unicode) {
839                         len = cifs_unicode_bytelen(filename);
840                 } else {
841                         /* BB should we make this strnlen of PATH_MAX? */
842                         len = strnlen(filename, PATH_MAX);
843                 }
844
845                 *pinum = le64_to_cpu(pFindData->UniqueId);
846         } else if (level == SMB_FIND_FILE_DIRECTORY_INFO) {
847                 FILE_DIRECTORY_INFO *pFindData =
848                         (FILE_DIRECTORY_INFO *)current_entry;
849                 filename = &pFindData->FileName[0];
850                 len = le32_to_cpu(pFindData->FileNameLength);
851         } else if (level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
852                 FILE_FULL_DIRECTORY_INFO *pFindData =
853                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
854                 filename = &pFindData->FileName[0];
855                 len = le32_to_cpu(pFindData->FileNameLength);
856         } else if (level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
857                 SEARCH_ID_FULL_DIR_INFO *pFindData =
858                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
859                 filename = &pFindData->FileName[0];
860                 len = le32_to_cpu(pFindData->FileNameLength);
861                 *pinum = le64_to_cpu(pFindData->UniqueId);
862         } else if (level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
863                 FILE_BOTH_DIRECTORY_INFO *pFindData =
864                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
865                 filename = &pFindData->FileName[0];
866                 len = le32_to_cpu(pFindData->FileNameLength);
867         } else if (level == SMB_FIND_FILE_INFO_STANDARD) {
868                 FIND_FILE_STANDARD_INFO *pFindData =
869                         (FIND_FILE_STANDARD_INFO *)current_entry;
870                 filename = &pFindData->FileName[0];
871                 /* one byte length, no name conversion */
872                 len = (unsigned int)pFindData->FileNameLength;
873         } else {
874                 cFYI(1, ("Unknown findfirst level %d", level));
875                 return -EINVAL;
876         }
877
878         if (len > max_len) {
879                 cERROR(1, ("bad search response length %d past smb end", len));
880                 return -EINVAL;
881         }
882
883         if (unicode) {
884                 /* BB fixme - test with long names */
885                 /* Note converted filename can be longer than in unicode */
886                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
887                         pqst->len = cifs_convertUCSpath((char *)pqst->name,
888                                         (__le16 *)filename, len/2, nlt);
889                 else
890                         pqst->len = cifs_strfromUCS_le((char *)pqst->name,
891                                         (__le16 *)filename, len/2, nlt);
892         } else {
893                 pqst->name = filename;
894                 pqst->len = len;
895         }
896         pqst->hash = full_name_hash(pqst->name, pqst->len);
897 /*      cFYI(1, ("filldir on %s",pqst->name));  */
898         return rc;
899 }
900
901 static int cifs_filldir(char *pfindEntry, struct file *file,
902         filldir_t filldir, void *direntry, char *scratch_buf, int max_len)
903 {
904         int rc = 0;
905         struct qstr qstring;
906         struct cifsFileInfo *pCifsF;
907         unsigned int obj_type;
908         __u64  inum;
909         struct cifs_sb_info *cifs_sb;
910         struct inode *tmp_inode;
911         struct dentry *tmp_dentry;
912
913         /* get filename and len into qstring */
914         /* get dentry */
915         /* decide whether to create and populate ionde */
916         if ((direntry == NULL) || (file == NULL))
917                 return -EINVAL;
918
919         pCifsF = file->private_data;
920
921         if ((scratch_buf == NULL) || (pfindEntry == NULL) || (pCifsF == NULL))
922                 return -ENOENT;
923
924         rc = cifs_entry_is_dot(pfindEntry, pCifsF);
925         /* skip . and .. since we added them first */
926         if (rc != 0)
927                 return 0;
928
929         cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
930
931         qstring.name = scratch_buf;
932         rc = cifs_get_name_from_search_buf(&qstring, pfindEntry,
933                         pCifsF->srch_inf.info_level,
934                         pCifsF->srch_inf.unicode, cifs_sb,
935                         max_len,
936                         &inum /* returned */);
937
938         if (rc)
939                 return rc;
940
941         /* only these two infolevels return valid inode numbers */
942         if (pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX ||
943             pCifsF->srch_inf.info_level == SMB_FIND_FILE_ID_FULL_DIR_INFO)
944                 rc = construct_dentry(&qstring, file, &tmp_inode, &tmp_dentry,
945                                         &inum);
946         else
947                 rc = construct_dentry(&qstring, file, &tmp_inode, &tmp_dentry,
948                                         NULL);
949
950         if ((tmp_inode == NULL) || (tmp_dentry == NULL))
951                 return -ENOMEM;
952
953         /* we pass in rc below, indicating whether it is a new inode,
954            so we can figure out whether to invalidate the inode cached
955            data if the file has changed */
956         if (pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX)
957                 unix_fill_in_inode(tmp_inode,
958                                    (FILE_UNIX_INFO *)pfindEntry,
959                                    &obj_type, rc);
960         else if (pCifsF->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD)
961                 fill_in_inode(tmp_inode, 0 /* old level 1 buffer type */,
962                                 pfindEntry, &obj_type, rc);
963         else
964                 fill_in_inode(tmp_inode, 1 /* NT */, pfindEntry, &obj_type, rc);
965
966         if (rc) /* new inode - needs to be tied to dentry */ {
967                 d_instantiate(tmp_dentry, tmp_inode);
968                 if (rc == 2)
969                         d_rehash(tmp_dentry);
970         }
971
972
973         rc = filldir(direntry, qstring.name, qstring.len, file->f_pos,
974                      tmp_inode->i_ino, obj_type);
975         if (rc) {
976                 cFYI(1, ("filldir rc = %d", rc));
977                 /* we can not return filldir errors to the caller
978                 since they are "normal" when the stat blocksize
979                 is too small - we return remapped error instead */
980                 rc = -EOVERFLOW;
981         }
982
983         dput(tmp_dentry);
984         return rc;
985 }
986
987
988 int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
989 {
990         int rc = 0;
991         int xid, i;
992         struct cifs_sb_info *cifs_sb;
993         struct cifsTconInfo *pTcon;
994         struct cifsFileInfo *cifsFile = NULL;
995         char *current_entry;
996         int num_to_fill = 0;
997         char *tmp_buf = NULL;
998         char *end_of_smb;
999         int max_len;
1000
1001         xid = GetXid();
1002
1003         cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
1004         pTcon = cifs_sb->tcon;
1005         if (pTcon == NULL)
1006                 return -EINVAL;
1007
1008         switch ((int) file->f_pos) {
1009         case 0:
1010                 if (filldir(direntry, ".", 1, file->f_pos,
1011                      file->f_path.dentry->d_inode->i_ino, DT_DIR) < 0) {
1012                         cERROR(1, ("Filldir for current dir failed"));
1013                         rc = -ENOMEM;
1014                         break;
1015                 }
1016                 file->f_pos++;
1017         case 1:
1018                 if (filldir(direntry, "..", 2, file->f_pos,
1019                      file->f_path.dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) {
1020                         cERROR(1, ("Filldir for parent dir failed"));
1021                         rc = -ENOMEM;
1022                         break;
1023                 }
1024                 file->f_pos++;
1025         default:
1026                 /* 1) If search is active,
1027                         is in current search buffer?
1028                         if it before then restart search
1029                         if after then keep searching till find it */
1030
1031                 if (file->private_data == NULL) {
1032                         rc = initiate_cifs_search(xid, file);
1033                         cFYI(1, ("initiate cifs search rc %d", rc));
1034                         if (rc) {
1035                                 FreeXid(xid);
1036                                 return rc;
1037                         }
1038                 }
1039                 if (file->private_data == NULL) {
1040                         rc = -EINVAL;
1041                         FreeXid(xid);
1042                         return rc;
1043                 }
1044                 cifsFile = file->private_data;
1045                 if (cifsFile->srch_inf.endOfSearch) {
1046                         if (cifsFile->srch_inf.emptyDir) {
1047                                 cFYI(1, ("End of search, empty dir"));
1048                                 rc = 0;
1049                                 break;
1050                         }
1051                 } /* else {
1052                         cifsFile->invalidHandle = true;
1053                         CIFSFindClose(xid, pTcon, cifsFile->netfid);
1054                 } */
1055
1056                 rc = find_cifs_entry(xid, pTcon, file,
1057                                 &current_entry, &num_to_fill);
1058                 if (rc) {
1059                         cFYI(1, ("fce error %d", rc));
1060                         goto rddir2_exit;
1061                 } else if (current_entry != NULL) {
1062                         cFYI(1, ("entry %lld found", file->f_pos));
1063                 } else {
1064                         cFYI(1, ("could not find entry"));
1065                         goto rddir2_exit;
1066                 }
1067                 cFYI(1, ("loop through %d times filling dir for net buf %p",
1068                         num_to_fill, cifsFile->srch_inf.ntwrk_buf_start));
1069                 max_len = smbCalcSize((struct smb_hdr *)
1070                                 cifsFile->srch_inf.ntwrk_buf_start);
1071                 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len;
1072
1073                 /* To be safe - for UCS to UTF-8 with strings loaded
1074                 with the rare long characters alloc more to account for
1075                 such multibyte target UTF-8 characters. cifs_unicode.c,
1076                 which actually does the conversion, has the same limit */
1077                 tmp_buf = kmalloc((2 * NAME_MAX) + 4, GFP_KERNEL);
1078                 for (i = 0; (i < num_to_fill) && (rc == 0); i++) {
1079                         if (current_entry == NULL) {
1080                                 /* evaluate whether this case is an error */
1081                                 cERROR(1, ("past SMB end,  num to fill %d i %d",
1082                                           num_to_fill, i));
1083                                 break;
1084                         }
1085                         /* if buggy server returns . and .. late do
1086                         we want to check for that here? */
1087                         rc = cifs_filldir(current_entry, file,
1088                                         filldir, direntry, tmp_buf, max_len);
1089                         if (rc == -EOVERFLOW) {
1090                                 rc = 0;
1091                                 break;
1092                         }
1093
1094                         file->f_pos++;
1095                         if (file->f_pos ==
1096                                 cifsFile->srch_inf.index_of_last_entry) {
1097                                 cFYI(1, ("last entry in buf at pos %lld %s",
1098                                         file->f_pos, tmp_buf));
1099                                 cifs_save_resume_key(current_entry, cifsFile);
1100                                 break;
1101                         } else
1102                                 current_entry =
1103                                         nxt_dir_entry(current_entry, end_of_smb,
1104                                                 cifsFile->srch_inf.info_level);
1105                 }
1106                 kfree(tmp_buf);
1107                 break;
1108         } /* end switch */
1109
1110 rddir2_exit:
1111         FreeXid(xid);
1112         return rc;
1113 }