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