Merge git://git.kernel.org/pub/scm/linux/kernel/git/sfrench/cifs-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 one if new inode created (which therefore needs to be hashed) */
60 /* Might check in the future if inode number changed so we can rehash inode */
61 static int construct_dentry(struct qstr *qstring, struct file *file,
62         struct inode **ptmp_inode, struct dentry **pnew_dentry)
63 {
64         struct dentry *tmp_dentry;
65         struct cifs_sb_info *cifs_sb;
66         struct cifsTconInfo *pTcon;
67         int rc = 0;
68
69         cFYI(1, ("For %s", qstring->name));
70         cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
71         pTcon = cifs_sb->tcon;
72
73         qstring->hash = full_name_hash(qstring->name, qstring->len);
74         tmp_dentry = d_lookup(file->f_path.dentry, qstring);
75         if (tmp_dentry) {
76                 cFYI(0, ("existing dentry with inode 0x%p",
77                          tmp_dentry->d_inode));
78                 *ptmp_inode = tmp_dentry->d_inode;
79 /* BB overwrite old name? i.e. tmp_dentry->d_name and tmp_dentry->d_name.len??*/
80                 if (*ptmp_inode == NULL) {
81                         *ptmp_inode = new_inode(file->f_path.dentry->d_sb);
82                         if (*ptmp_inode == NULL)
83                                 return rc;
84                         rc = 1;
85                 }
86                 if (file->f_path.dentry->d_sb->s_flags & MS_NOATIME)
87                         (*ptmp_inode)->i_flags |= S_NOATIME | S_NOCMTIME;
88         } else {
89                 tmp_dentry = d_alloc(file->f_path.dentry, qstring);
90                 if (tmp_dentry == NULL) {
91                         cERROR(1, ("Failed allocating dentry"));
92                         *ptmp_inode = NULL;
93                         return rc;
94                 }
95
96                 *ptmp_inode = new_inode(file->f_path.dentry->d_sb);
97                 if (pTcon->nocase)
98                         tmp_dentry->d_op = &cifs_ci_dentry_ops;
99                 else
100                         tmp_dentry->d_op = &cifs_dentry_ops;
101                 if (*ptmp_inode == NULL)
102                         return rc;
103                 if (file->f_path.dentry->d_sb->s_flags & MS_NOATIME)
104                         (*ptmp_inode)->i_flags |= S_NOATIME | S_NOCMTIME;
105                 rc = 2;
106         }
107
108         tmp_dentry->d_time = jiffies;
109         *pnew_dentry = tmp_dentry;
110         return rc;
111 }
112
113 static void AdjustForTZ(struct cifsTconInfo *tcon, struct inode *inode)
114 {
115         if ((tcon) && (tcon->ses) && (tcon->ses->server)) {
116                 inode->i_ctime.tv_sec += tcon->ses->server->timeAdj;
117                 inode->i_mtime.tv_sec += tcon->ses->server->timeAdj;
118                 inode->i_atime.tv_sec += tcon->ses->server->timeAdj;
119         }
120         return;
121 }
122
123
124 static void fill_in_inode(struct inode *tmp_inode, int new_buf_type,
125                           char *buf, unsigned int *pobject_type, int isNewInode)
126 {
127         loff_t local_size;
128         struct timespec local_mtime;
129
130         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
131         struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
132         __u32 attr;
133         __u64 allocation_size;
134         __u64 end_of_file;
135         umode_t default_mode;
136
137         /* save mtime and size */
138         local_mtime = tmp_inode->i_mtime;
139         local_size  = tmp_inode->i_size;
140
141         if (new_buf_type) {
142                 FILE_DIRECTORY_INFO *pfindData = (FILE_DIRECTORY_INFO *)buf;
143
144                 attr = le32_to_cpu(pfindData->ExtFileAttributes);
145                 allocation_size = le64_to_cpu(pfindData->AllocationSize);
146                 end_of_file = le64_to_cpu(pfindData->EndOfFile);
147                 tmp_inode->i_atime =
148                       cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
149                 tmp_inode->i_mtime =
150                       cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
151                 tmp_inode->i_ctime =
152                       cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
153         } else { /* legacy, OS2 and DOS style */
154 /*              struct timespec ts;*/
155                 FIND_FILE_STANDARD_INFO *pfindData =
156                         (FIND_FILE_STANDARD_INFO *)buf;
157
158                 tmp_inode->i_mtime = cnvrtDosUnixTm(
159                                 le16_to_cpu(pfindData->LastWriteDate),
160                                 le16_to_cpu(pfindData->LastWriteTime));
161                 tmp_inode->i_atime = cnvrtDosUnixTm(
162                                 le16_to_cpu(pfindData->LastAccessDate),
163                                 le16_to_cpu(pfindData->LastAccessTime));
164                 tmp_inode->i_ctime = cnvrtDosUnixTm(
165                                 le16_to_cpu(pfindData->LastWriteDate),
166                                 le16_to_cpu(pfindData->LastWriteTime));
167                 AdjustForTZ(cifs_sb->tcon, tmp_inode);
168                 attr = le16_to_cpu(pfindData->Attributes);
169                 allocation_size = le32_to_cpu(pfindData->AllocationSize);
170                 end_of_file = le32_to_cpu(pfindData->DataSize);
171         }
172
173         /* Linux can not store file creation time unfortunately so ignore it */
174
175         cifsInfo->cifsAttrs = attr;
176 #ifdef CONFIG_CIFS_EXPERIMENTAL
177         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
178                 /* get more accurate mode via ACL - so force inode refresh */
179                 cifsInfo->time = 0;
180         } else
181 #endif /* CONFIG_CIFS_EXPERIMENTAL */
182                 cifsInfo->time = jiffies;
183
184         /* treat dos attribute of read-only as read-only mode bit e.g. 555? */
185         /* 2767 perms - indicate mandatory locking */
186                 /* BB fill in uid and gid here? with help from winbind?
187                    or retrieve from NTFS stream extended attribute */
188         if (atomic_read(&cifsInfo->inUse) == 0) {
189                 tmp_inode->i_uid = cifs_sb->mnt_uid;
190                 tmp_inode->i_gid = cifs_sb->mnt_gid;
191         }
192
193         if (attr & ATTR_DIRECTORY)
194                 default_mode = cifs_sb->mnt_dir_mode;
195         else
196                 default_mode = cifs_sb->mnt_file_mode;
197
198         /* set initial permissions */
199         if ((atomic_read(&cifsInfo->inUse) == 0) ||
200             (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0)
201                 tmp_inode->i_mode = default_mode;
202         else {
203                 /* just reenable write bits if !ATTR_READONLY */
204                 if ((tmp_inode->i_mode & S_IWUGO) == 0 &&
205                     (attr & ATTR_READONLY) == 0)
206                         tmp_inode->i_mode |= (S_IWUGO & default_mode);
207
208                 tmp_inode->i_mode &= ~S_IFMT;
209         }
210
211         /* clear write bits if ATTR_READONLY is set */
212         if (attr & ATTR_READONLY)
213                 tmp_inode->i_mode &= ~S_IWUGO;
214
215         /* set inode type */
216         if ((attr & ATTR_SYSTEM) &&
217             (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)) {
218                 if (end_of_file == 0)  {
219                         tmp_inode->i_mode |= S_IFIFO;
220                         *pobject_type = DT_FIFO;
221                 } else {
222                         /*
223                          * trying to get the type can be slow, so just call
224                          * this a regular file for now, and mark for reval
225                          */
226                         tmp_inode->i_mode |= S_IFREG;
227                         *pobject_type = DT_REG;
228                         cifsInfo->time = 0;
229                 }
230         } else {
231                 if (attr & ATTR_DIRECTORY) {
232                         tmp_inode->i_mode |= S_IFDIR;
233                         *pobject_type = DT_DIR;
234                 } else {
235                         tmp_inode->i_mode |= S_IFREG;
236                         *pobject_type = DT_REG;
237                 }
238         }
239
240         /* can not fill in nlink here as in qpathinfo version and Unx search */
241         if (atomic_read(&cifsInfo->inUse) == 0)
242                 atomic_set(&cifsInfo->inUse, 1);
243
244         spin_lock(&tmp_inode->i_lock);
245         if (is_size_safe_to_change(cifsInfo, end_of_file)) {
246                 /* can not safely change the file size here if the
247                 client is writing to it due to potential races */
248                 i_size_write(tmp_inode, end_of_file);
249
250         /* 512 bytes (2**9) is the fake blocksize that must be used */
251         /* for this calculation, even though the reported blocksize is larger */
252                 tmp_inode->i_blocks = (512 - 1 + allocation_size) >> 9;
253         }
254         spin_unlock(&tmp_inode->i_lock);
255
256         if (allocation_size < end_of_file)
257                 cFYI(1, ("May be sparse file, allocation less than file size"));
258         cFYI(1, ("File Size %ld and blocks %llu",
259                 (unsigned long)tmp_inode->i_size,
260                 (unsigned long long)tmp_inode->i_blocks));
261         if (S_ISREG(tmp_inode->i_mode)) {
262                 cFYI(1, ("File inode"));
263                 tmp_inode->i_op = &cifs_file_inode_ops;
264                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
265                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
266                                 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
267                         else
268                                 tmp_inode->i_fop = &cifs_file_direct_ops;
269                 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
270                         tmp_inode->i_fop = &cifs_file_nobrl_ops;
271                 else
272                         tmp_inode->i_fop = &cifs_file_ops;
273
274                 if ((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
275                    (cifs_sb->tcon->ses->server->maxBuf <
276                         PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
277                         tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
278                 else
279                         tmp_inode->i_data.a_ops = &cifs_addr_ops;
280
281                 if (isNewInode)
282                         return; /* No sense invalidating pages for new inode
283                                    since have not started caching readahead file
284                                    data yet */
285
286                 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
287                         (local_size == tmp_inode->i_size)) {
288                         cFYI(1, ("inode exists but unchanged"));
289                 } else {
290                         /* file may have changed on server */
291                         cFYI(1, ("invalidate inode, readdir detected change"));
292                         invalidate_remote_inode(tmp_inode);
293                 }
294         } else if (S_ISDIR(tmp_inode->i_mode)) {
295                 cFYI(1, ("Directory inode"));
296                 tmp_inode->i_op = &cifs_dir_inode_ops;
297                 tmp_inode->i_fop = &cifs_dir_ops;
298         } else if (S_ISLNK(tmp_inode->i_mode)) {
299                 cFYI(1, ("Symbolic Link inode"));
300                 tmp_inode->i_op = &cifs_symlink_inode_ops;
301         } else {
302                 cFYI(1, ("Init special inode"));
303                 init_special_inode(tmp_inode, tmp_inode->i_mode,
304                                    tmp_inode->i_rdev);
305         }
306 }
307
308 static void unix_fill_in_inode(struct inode *tmp_inode,
309         FILE_UNIX_INFO *pfindData, unsigned int *pobject_type, int isNewInode)
310 {
311         loff_t local_size;
312         struct timespec local_mtime;
313
314         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
315         struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
316
317         __u32 type = le32_to_cpu(pfindData->Type);
318         __u64 num_of_bytes = le64_to_cpu(pfindData->NumOfBytes);
319         __u64 end_of_file = le64_to_cpu(pfindData->EndOfFile);
320         cifsInfo->time = jiffies;
321         atomic_inc(&cifsInfo->inUse);
322
323         /* save mtime and size */
324         local_mtime = tmp_inode->i_mtime;
325         local_size  = tmp_inode->i_size;
326
327         tmp_inode->i_atime =
328             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
329         tmp_inode->i_mtime =
330             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastModificationTime));
331         tmp_inode->i_ctime =
332             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastStatusChange));
333
334         tmp_inode->i_mode = le64_to_cpu(pfindData->Permissions);
335         /* since we set the inode type below we need to mask off type
336            to avoid strange results if bits above were corrupt */
337         tmp_inode->i_mode &= ~S_IFMT;
338         if (type == UNIX_FILE) {
339                 *pobject_type = DT_REG;
340                 tmp_inode->i_mode |= S_IFREG;
341         } else if (type == UNIX_SYMLINK) {
342                 *pobject_type = DT_LNK;
343                 tmp_inode->i_mode |= S_IFLNK;
344         } else if (type == UNIX_DIR) {
345                 *pobject_type = DT_DIR;
346                 tmp_inode->i_mode |= S_IFDIR;
347         } else if (type == UNIX_CHARDEV) {
348                 *pobject_type = DT_CHR;
349                 tmp_inode->i_mode |= S_IFCHR;
350                 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
351                                 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
352         } else if (type == UNIX_BLOCKDEV) {
353                 *pobject_type = DT_BLK;
354                 tmp_inode->i_mode |= S_IFBLK;
355                 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
356                                 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
357         } else if (type == UNIX_FIFO) {
358                 *pobject_type = DT_FIFO;
359                 tmp_inode->i_mode |= S_IFIFO;
360         } else if (type == UNIX_SOCKET) {
361                 *pobject_type = DT_SOCK;
362                 tmp_inode->i_mode |= S_IFSOCK;
363         } else {
364                 /* safest to just call it a file */
365                 *pobject_type = DT_REG;
366                 tmp_inode->i_mode |= S_IFREG;
367                 cFYI(1, ("unknown inode type %d", type));
368         }
369
370         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
371                 tmp_inode->i_uid = cifs_sb->mnt_uid;
372         else
373                 tmp_inode->i_uid = le64_to_cpu(pfindData->Uid);
374         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
375                 tmp_inode->i_gid = cifs_sb->mnt_gid;
376         else
377                 tmp_inode->i_gid = le64_to_cpu(pfindData->Gid);
378         tmp_inode->i_nlink = le64_to_cpu(pfindData->Nlinks);
379
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 /* find the corresponding entry in the search */
644 /* Note that the SMB server returns search entries for . and .. which
645    complicates logic here if we choose to parse for them and we do not
646    assume that they are located in the findfirst return buffer.*/
647 /* We start counting in the buffer with entry 2 and increment for every
648    entry (do not increment for . or .. entry) */
649 static int find_cifs_entry(const int xid, struct cifsTconInfo *pTcon,
650         struct file *file, char **ppCurrentEntry, int *num_to_ret)
651 {
652         int rc = 0;
653         int pos_in_buf = 0;
654         loff_t first_entry_in_buffer;
655         loff_t index_to_find = file->f_pos;
656         struct cifsFileInfo *cifsFile = file->private_data;
657         /* check if index in the buffer */
658
659         if ((cifsFile == NULL) || (ppCurrentEntry == NULL) ||
660            (num_to_ret == NULL))
661                 return -ENOENT;
662
663         *ppCurrentEntry = NULL;
664         first_entry_in_buffer =
665                 cifsFile->srch_inf.index_of_last_entry -
666                         cifsFile->srch_inf.entries_in_buffer;
667
668         /* if first entry in buf is zero then is first buffer
669         in search response data which means it is likely . and ..
670         will be in this buffer, although some servers do not return
671         . and .. for the root of a drive and for those we need
672         to start two entries earlier */
673
674         dump_cifs_file_struct(file, "In fce ");
675         if (((index_to_find < cifsFile->srch_inf.index_of_last_entry) &&
676              is_dir_changed(file)) ||
677            (index_to_find < first_entry_in_buffer)) {
678                 /* close and restart search */
679                 cFYI(1, ("search backing up - close and restart search"));
680                 if (!cifsFile->srch_inf.endOfSearch &&
681                     !cifsFile->invalidHandle) {
682                         cifsFile->invalidHandle = true;
683                         CIFSFindClose(xid, pTcon, cifsFile->netfid);
684                 }
685                 if (cifsFile->srch_inf.ntwrk_buf_start) {
686                         cFYI(1, ("freeing SMB ff cache buf on search rewind"));
687                         if (cifsFile->srch_inf.smallBuf)
688                                 cifs_small_buf_release(cifsFile->srch_inf.
689                                                 ntwrk_buf_start);
690                         else
691                                 cifs_buf_release(cifsFile->srch_inf.
692                                                 ntwrk_buf_start);
693                 }
694                 rc = initiate_cifs_search(xid, file);
695                 if (rc) {
696                         cFYI(1, ("error %d reinitiating a search on rewind",
697                                  rc));
698                         return rc;
699                 }
700         }
701
702         while ((index_to_find >= cifsFile->srch_inf.index_of_last_entry) &&
703               (rc == 0) && !cifsFile->srch_inf.endOfSearch) {
704                 cFYI(1, ("calling findnext2"));
705                 rc = CIFSFindNext(xid, pTcon, cifsFile->netfid,
706                                   &cifsFile->srch_inf);
707                 if (rc)
708                         return -ENOENT;
709         }
710         if (index_to_find < cifsFile->srch_inf.index_of_last_entry) {
711                 /* we found the buffer that contains the entry */
712                 /* scan and find it */
713                 int i;
714                 char *current_entry;
715                 char *end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
716                         smbCalcSize((struct smb_hdr *)
717                                 cifsFile->srch_inf.ntwrk_buf_start);
718
719                 current_entry = cifsFile->srch_inf.srch_entries_start;
720                 first_entry_in_buffer = cifsFile->srch_inf.index_of_last_entry
721                                         - cifsFile->srch_inf.entries_in_buffer;
722                 pos_in_buf = index_to_find - first_entry_in_buffer;
723                 cFYI(1, ("found entry - pos_in_buf %d", pos_in_buf));
724
725                 for (i = 0; (i < (pos_in_buf)) && (current_entry != NULL); i++) {
726                         /* go entry by entry figuring out which is first */
727                         current_entry = nxt_dir_entry(current_entry, end_of_smb,
728                                                 cifsFile->srch_inf.info_level);
729                 }
730                 if ((current_entry == NULL) && (i < pos_in_buf)) {
731                         /* BB fixme - check if we should flag this error */
732                         cERROR(1, ("reached end of buf searching for pos in buf"
733                           " %d index to find %lld rc %d",
734                           pos_in_buf, index_to_find, rc));
735                 }
736                 rc = 0;
737                 *ppCurrentEntry = current_entry;
738         } else {
739                 cFYI(1, ("index not in buffer - could not findnext into it"));
740                 return 0;
741         }
742
743         if (pos_in_buf >= cifsFile->srch_inf.entries_in_buffer) {
744                 cFYI(1, ("can not return entries pos_in_buf beyond last"));
745                 *num_to_ret = 0;
746         } else
747                 *num_to_ret = cifsFile->srch_inf.entries_in_buffer - pos_in_buf;
748
749         return rc;
750 }
751
752 /* inode num, inode type and filename returned */
753 static int cifs_get_name_from_search_buf(struct qstr *pqst,
754         char *current_entry, __u16 level, unsigned int unicode,
755         struct cifs_sb_info *cifs_sb, int max_len, ino_t *pinum)
756 {
757         int rc = 0;
758         unsigned int len = 0;
759         char *filename;
760         struct nls_table *nlt = cifs_sb->local_nls;
761
762         *pinum = 0;
763
764         if (level == SMB_FIND_FILE_UNIX) {
765                 FILE_UNIX_INFO *pFindData = (FILE_UNIX_INFO *)current_entry;
766
767                 filename = &pFindData->FileName[0];
768                 if (unicode) {
769                         len = cifs_unicode_bytelen(filename);
770                 } else {
771                         /* BB should we make this strnlen of PATH_MAX? */
772                         len = strnlen(filename, PATH_MAX);
773                 }
774
775                 /* BB fixme - hash low and high 32 bits if not 64 bit arch BB */
776                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
777                         *pinum = pFindData->UniqueId;
778         } else if (level == SMB_FIND_FILE_DIRECTORY_INFO) {
779                 FILE_DIRECTORY_INFO *pFindData =
780                         (FILE_DIRECTORY_INFO *)current_entry;
781                 filename = &pFindData->FileName[0];
782                 len = le32_to_cpu(pFindData->FileNameLength);
783         } else if (level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
784                 FILE_FULL_DIRECTORY_INFO *pFindData =
785                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
786                 filename = &pFindData->FileName[0];
787                 len = le32_to_cpu(pFindData->FileNameLength);
788         } else if (level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
789                 SEARCH_ID_FULL_DIR_INFO *pFindData =
790                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
791                 filename = &pFindData->FileName[0];
792                 len = le32_to_cpu(pFindData->FileNameLength);
793                 *pinum = pFindData->UniqueId;
794         } else if (level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
795                 FILE_BOTH_DIRECTORY_INFO *pFindData =
796                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
797                 filename = &pFindData->FileName[0];
798                 len = le32_to_cpu(pFindData->FileNameLength);
799         } else if (level == SMB_FIND_FILE_INFO_STANDARD) {
800                 FIND_FILE_STANDARD_INFO *pFindData =
801                         (FIND_FILE_STANDARD_INFO *)current_entry;
802                 filename = &pFindData->FileName[0];
803                 /* one byte length, no name conversion */
804                 len = (unsigned int)pFindData->FileNameLength;
805         } else {
806                 cFYI(1, ("Unknown findfirst level %d", level));
807                 return -EINVAL;
808         }
809
810         if (len > max_len) {
811                 cERROR(1, ("bad search response length %d past smb end", len));
812                 return -EINVAL;
813         }
814
815         if (unicode) {
816                 /* BB fixme - test with long names */
817                 /* Note converted filename can be longer than in unicode */
818                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
819                         pqst->len = cifs_convertUCSpath((char *)pqst->name,
820                                         (__le16 *)filename, len/2, nlt);
821                 else
822                         pqst->len = cifs_strfromUCS_le((char *)pqst->name,
823                                         (__le16 *)filename, len/2, nlt);
824         } else {
825                 pqst->name = filename;
826                 pqst->len = len;
827         }
828         pqst->hash = full_name_hash(pqst->name, pqst->len);
829 /*      cFYI(1, ("filldir on %s",pqst->name));  */
830         return rc;
831 }
832
833 static int cifs_filldir(char *pfindEntry, struct file *file,
834         filldir_t filldir, void *direntry, char *scratch_buf, int max_len)
835 {
836         int rc = 0;
837         struct qstr qstring;
838         struct cifsFileInfo *pCifsF;
839         unsigned int obj_type;
840         ino_t  inum;
841         struct cifs_sb_info *cifs_sb;
842         struct inode *tmp_inode;
843         struct dentry *tmp_dentry;
844
845         /* get filename and len into qstring */
846         /* get dentry */
847         /* decide whether to create and populate ionde */
848         if ((direntry == NULL) || (file == NULL))
849                 return -EINVAL;
850
851         pCifsF = file->private_data;
852
853         if ((scratch_buf == NULL) || (pfindEntry == NULL) || (pCifsF == NULL))
854                 return -ENOENT;
855
856         rc = cifs_entry_is_dot(pfindEntry, pCifsF);
857         /* skip . and .. since we added them first */
858         if (rc != 0)
859                 return 0;
860
861         cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
862
863         qstring.name = scratch_buf;
864         rc = cifs_get_name_from_search_buf(&qstring, pfindEntry,
865                         pCifsF->srch_inf.info_level,
866                         pCifsF->srch_inf.unicode, cifs_sb,
867                         max_len,
868                         &inum /* returned */);
869
870         if (rc)
871                 return rc;
872
873         rc = construct_dentry(&qstring, file, &tmp_inode, &tmp_dentry);
874         if ((tmp_inode == NULL) || (tmp_dentry == NULL))
875                 return -ENOMEM;
876
877         if (rc) {
878                 /* inode created, we need to hash it with right inode number */
879                 if (inum != 0) {
880                         /* BB fixme - hash the 2 32 quantities bits together if
881                          *  necessary BB */
882                         tmp_inode->i_ino = inum;
883                 }
884                 insert_inode_hash(tmp_inode);
885         }
886
887         /* we pass in rc below, indicating whether it is a new inode,
888            so we can figure out whether to invalidate the inode cached
889            data if the file has changed */
890         if (pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX)
891                 unix_fill_in_inode(tmp_inode,
892                                    (FILE_UNIX_INFO *)pfindEntry,
893                                    &obj_type, rc);
894         else if (pCifsF->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD)
895                 fill_in_inode(tmp_inode, 0 /* old level 1 buffer type */,
896                                 pfindEntry, &obj_type, rc);
897         else
898                 fill_in_inode(tmp_inode, 1 /* NT */, pfindEntry, &obj_type, rc);
899
900         if (rc) /* new inode - needs to be tied to dentry */ {
901                 d_instantiate(tmp_dentry, tmp_inode);
902                 if (rc == 2)
903                         d_rehash(tmp_dentry);
904         }
905
906
907         rc = filldir(direntry, qstring.name, qstring.len, file->f_pos,
908                      tmp_inode->i_ino, obj_type);
909         if (rc) {
910                 cFYI(1, ("filldir rc = %d", rc));
911                 /* we can not return filldir errors to the caller
912                 since they are "normal" when the stat blocksize
913                 is too small - we return remapped error instead */
914                 rc = -EOVERFLOW;
915         }
916
917         dput(tmp_dentry);
918         return rc;
919 }
920
921 static int cifs_save_resume_key(const char *current_entry,
922         struct cifsFileInfo *cifsFile)
923 {
924         int rc = 0;
925         unsigned int len = 0;
926         __u16 level;
927         char *filename;
928
929         if ((cifsFile == NULL) || (current_entry == NULL))
930                 return -EINVAL;
931
932         level = cifsFile->srch_inf.info_level;
933
934         if (level == SMB_FIND_FILE_UNIX) {
935                 FILE_UNIX_INFO *pFindData = (FILE_UNIX_INFO *)current_entry;
936
937                 filename = &pFindData->FileName[0];
938                 if (cifsFile->srch_inf.unicode) {
939                         len = cifs_unicode_bytelen(filename);
940                 } else {
941                         /* BB should we make this strnlen of PATH_MAX? */
942                         len = strnlen(filename, PATH_MAX);
943                 }
944                 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
945         } else if (level == SMB_FIND_FILE_DIRECTORY_INFO) {
946                 FILE_DIRECTORY_INFO *pFindData =
947                         (FILE_DIRECTORY_INFO *)current_entry;
948                 filename = &pFindData->FileName[0];
949                 len = le32_to_cpu(pFindData->FileNameLength);
950                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
951         } else if (level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
952                 FILE_FULL_DIRECTORY_INFO *pFindData =
953                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
954                 filename = &pFindData->FileName[0];
955                 len = le32_to_cpu(pFindData->FileNameLength);
956                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
957         } else if (level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
958                 SEARCH_ID_FULL_DIR_INFO *pFindData =
959                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
960                 filename = &pFindData->FileName[0];
961                 len = le32_to_cpu(pFindData->FileNameLength);
962                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
963         } else if (level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
964                 FILE_BOTH_DIRECTORY_INFO *pFindData =
965                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
966                 filename = &pFindData->FileName[0];
967                 len = le32_to_cpu(pFindData->FileNameLength);
968                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
969         } else if (level == SMB_FIND_FILE_INFO_STANDARD) {
970                 FIND_FILE_STANDARD_INFO *pFindData =
971                         (FIND_FILE_STANDARD_INFO *)current_entry;
972                 filename = &pFindData->FileName[0];
973                 /* one byte length, no name conversion */
974                 len = (unsigned int)pFindData->FileNameLength;
975                 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
976         } else {
977                 cFYI(1, ("Unknown findfirst level %d", level));
978                 return -EINVAL;
979         }
980         cifsFile->srch_inf.resume_name_len = len;
981         cifsFile->srch_inf.presume_name = filename;
982         return rc;
983 }
984
985 int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
986 {
987         int rc = 0;
988         int xid, i;
989         struct cifs_sb_info *cifs_sb;
990         struct cifsTconInfo *pTcon;
991         struct cifsFileInfo *cifsFile = NULL;
992         char *current_entry;
993         int num_to_fill = 0;
994         char *tmp_buf = NULL;
995         char *end_of_smb;
996         int max_len;
997
998         xid = GetXid();
999
1000         cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
1001         pTcon = cifs_sb->tcon;
1002         if (pTcon == NULL)
1003                 return -EINVAL;
1004
1005         switch ((int) file->f_pos) {
1006         case 0:
1007                 if (filldir(direntry, ".", 1, file->f_pos,
1008                      file->f_path.dentry->d_inode->i_ino, DT_DIR) < 0) {
1009                         cERROR(1, ("Filldir for current dir failed"));
1010                         rc = -ENOMEM;
1011                         break;
1012                 }
1013                 file->f_pos++;
1014         case 1:
1015                 if (filldir(direntry, "..", 2, file->f_pos,
1016                      file->f_path.dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) {
1017                         cERROR(1, ("Filldir for parent dir failed"));
1018                         rc = -ENOMEM;
1019                         break;
1020                 }
1021                 file->f_pos++;
1022         default:
1023                 /* 1) If search is active,
1024                         is in current search buffer?
1025                         if it before then restart search
1026                         if after then keep searching till find it */
1027
1028                 if (file->private_data == NULL) {
1029                         rc = initiate_cifs_search(xid, file);
1030                         cFYI(1, ("initiate cifs search rc %d", rc));
1031                         if (rc) {
1032                                 FreeXid(xid);
1033                                 return rc;
1034                         }
1035                 }
1036                 if (file->private_data == NULL) {
1037                         rc = -EINVAL;
1038                         FreeXid(xid);
1039                         return rc;
1040                 }
1041                 cifsFile = file->private_data;
1042                 if (cifsFile->srch_inf.endOfSearch) {
1043                         if (cifsFile->srch_inf.emptyDir) {
1044                                 cFYI(1, ("End of search, empty dir"));
1045                                 rc = 0;
1046                                 break;
1047                         }
1048                 } /* else {
1049                         cifsFile->invalidHandle = true;
1050                         CIFSFindClose(xid, pTcon, cifsFile->netfid);
1051                 } */
1052
1053                 rc = find_cifs_entry(xid, pTcon, file,
1054                                 &current_entry, &num_to_fill);
1055                 if (rc) {
1056                         cFYI(1, ("fce error %d", rc));
1057                         goto rddir2_exit;
1058                 } else if (current_entry != NULL) {
1059                         cFYI(1, ("entry %lld found", file->f_pos));
1060                 } else {
1061                         cFYI(1, ("could not find entry"));
1062                         goto rddir2_exit;
1063                 }
1064                 cFYI(1, ("loop through %d times filling dir for net buf %p",
1065                         num_to_fill, cifsFile->srch_inf.ntwrk_buf_start));
1066                 max_len = smbCalcSize((struct smb_hdr *)
1067                                 cifsFile->srch_inf.ntwrk_buf_start);
1068                 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len;
1069
1070                 /* To be safe - for UCS to UTF-8 with strings loaded
1071                 with the rare long characters alloc more to account for
1072                 such multibyte target UTF-8 characters. cifs_unicode.c,
1073                 which actually does the conversion, has the same limit */
1074                 tmp_buf = kmalloc((2 * NAME_MAX) + 4, GFP_KERNEL);
1075                 for (i = 0; (i < num_to_fill) && (rc == 0); i++) {
1076                         if (current_entry == NULL) {
1077                                 /* evaluate whether this case is an error */
1078                                 cERROR(1, ("past SMB end,  num to fill %d i %d",
1079                                           num_to_fill, i));
1080                                 break;
1081                         }
1082                         /* if buggy server returns . and .. late do
1083                         we want to check for that here? */
1084                         rc = cifs_filldir(current_entry, file,
1085                                         filldir, direntry, tmp_buf, max_len);
1086                         if (rc == -EOVERFLOW) {
1087                                 rc = 0;
1088                                 break;
1089                         }
1090
1091                         file->f_pos++;
1092                         if (file->f_pos ==
1093                                 cifsFile->srch_inf.index_of_last_entry) {
1094                                 cFYI(1, ("last entry in buf at pos %lld %s",
1095                                         file->f_pos, tmp_buf));
1096                                 cifs_save_resume_key(current_entry, cifsFile);
1097                                 break;
1098                         } else
1099                                 current_entry =
1100                                         nxt_dir_entry(current_entry, end_of_smb,
1101                                                 cifsFile->srch_inf.info_level);
1102                 }
1103                 kfree(tmp_buf);
1104                 break;
1105         } /* end switch */
1106
1107 rddir2_exit:
1108         FreeXid(xid);
1109         return rc;
1110 }