Merge branch 'locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux-2.6] / fs / cifs / readdir.c
1 /*
2  *   fs/cifs/readdir.c
3  *
4  *   Directory search handling
5  *
6  *   Copyright (C) International Business Machines  Corp., 2004, 2008
7  *   Author(s): Steve French (sfrench@us.ibm.com)
8  *
9  *   This library is free software; you can redistribute it and/or modify
10  *   it under the terms of the GNU Lesser General Public License as published
11  *   by the Free Software Foundation; either version 2.1 of the License, or
12  *   (at your option) any later version.
13  *
14  *   This library is distributed in the hope that it will be useful,
15  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
16  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
17  *   the GNU Lesser General Public License for more details.
18  *
19  *   You should have received a copy of the GNU Lesser General Public License
20  *   along with this library; if not, write to the Free Software
21  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22  */
23 #include <linux/fs.h>
24 #include <linux/pagemap.h>
25 #include <linux/stat.h>
26 #include "cifspdu.h"
27 #include "cifsglob.h"
28 #include "cifsproto.h"
29 #include "cifs_unicode.h"
30 #include "cifs_debug.h"
31 #include "cifs_fs_sb.h"
32 #include "cifsfs.h"
33
34 #ifdef CONFIG_CIFS_DEBUG2
35 static void dump_cifs_file_struct(struct file *file, char *label)
36 {
37         struct cifsFileInfo *cf;
38
39         if (file) {
40                 cf = file->private_data;
41                 if (cf == NULL) {
42                         cFYI(1, ("empty cifs private file data"));
43                         return;
44                 }
45                 if (cf->invalidHandle)
46                         cFYI(1, ("invalid handle"));
47                 if (cf->srch_inf.endOfSearch)
48                         cFYI(1, ("end of search"));
49                 if (cf->srch_inf.emptyDir)
50                         cFYI(1, ("empty dir"));
51         }
52 }
53 #else
54 static inline void dump_cifs_file_struct(struct file *file, char *label)
55 {
56 }
57 #endif /* DEBUG2 */
58
59 /* Returns 1 if new inode created, 2 if both dentry and inode were */
60 /* Might check in the future if inode number changed so we can rehash inode */
61 static int
62 construct_dentry(struct qstr *qstring, struct file *file,
63                  struct inode **ptmp_inode, struct dentry **pnew_dentry,
64                  __u64 *inum)
65 {
66         struct dentry *tmp_dentry = NULL;
67         struct super_block *sb = file->f_path.dentry->d_sb;
68         int rc = 0;
69
70         cFYI(1, ("For %s", qstring->name));
71
72         qstring->hash = full_name_hash(qstring->name, qstring->len);
73         tmp_dentry = d_lookup(file->f_path.dentry, qstring);
74         if (tmp_dentry) {
75                 /* BB: overwrite old name? i.e. tmp_dentry->d_name and
76                  * tmp_dentry->d_name.len??
77                  */
78                 cFYI(0, ("existing dentry with inode 0x%p",
79                          tmp_dentry->d_inode));
80                 *ptmp_inode = tmp_dentry->d_inode;
81                 if (*ptmp_inode == NULL) {
82                         *ptmp_inode = cifs_new_inode(sb, inum);
83                         if (*ptmp_inode == NULL)
84                                 return rc;
85                         rc = 1;
86                 }
87         } else {
88                 tmp_dentry = d_alloc(file->f_path.dentry, qstring);
89                 if (tmp_dentry == NULL) {
90                         cERROR(1, ("Failed allocating dentry"));
91                         *ptmp_inode = NULL;
92                         return rc;
93                 }
94
95                 if (CIFS_SB(sb)->tcon->nocase)
96                         tmp_dentry->d_op = &cifs_ci_dentry_ops;
97                 else
98                         tmp_dentry->d_op = &cifs_dentry_ops;
99
100                 *ptmp_inode = cifs_new_inode(sb, inum);
101                 if (*ptmp_inode == NULL)
102                         return rc;
103                 rc = 2;
104         }
105
106         tmp_dentry->d_time = jiffies;
107         *pnew_dentry = tmp_dentry;
108         return rc;
109 }
110
111 static void AdjustForTZ(struct cifsTconInfo *tcon, struct inode *inode)
112 {
113         if ((tcon) && (tcon->ses) && (tcon->ses->server)) {
114                 inode->i_ctime.tv_sec += tcon->ses->server->timeAdj;
115                 inode->i_mtime.tv_sec += tcon->ses->server->timeAdj;
116                 inode->i_atime.tv_sec += tcon->ses->server->timeAdj;
117         }
118         return;
119 }
120
121
122 static void fill_in_inode(struct inode *tmp_inode, int new_buf_type,
123                           char *buf, unsigned int *pobject_type, int isNewInode)
124 {
125         loff_t local_size;
126         struct timespec local_mtime;
127
128         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
129         struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
130         __u32 attr;
131         __u64 allocation_size;
132         __u64 end_of_file;
133         umode_t default_mode;
134
135         /* save mtime and size */
136         local_mtime = tmp_inode->i_mtime;
137         local_size  = tmp_inode->i_size;
138
139         if (new_buf_type) {
140                 FILE_DIRECTORY_INFO *pfindData = (FILE_DIRECTORY_INFO *)buf;
141
142                 attr = le32_to_cpu(pfindData->ExtFileAttributes);
143                 allocation_size = le64_to_cpu(pfindData->AllocationSize);
144                 end_of_file = le64_to_cpu(pfindData->EndOfFile);
145                 tmp_inode->i_atime =
146                       cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
147                 tmp_inode->i_mtime =
148                       cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
149                 tmp_inode->i_ctime =
150                       cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
151         } else { /* legacy, OS2 and DOS style */
152 /*              struct timespec ts;*/
153                 FIND_FILE_STANDARD_INFO *pfindData =
154                         (FIND_FILE_STANDARD_INFO *)buf;
155
156                 tmp_inode->i_mtime = cnvrtDosUnixTm(
157                                 le16_to_cpu(pfindData->LastWriteDate),
158                                 le16_to_cpu(pfindData->LastWriteTime));
159                 tmp_inode->i_atime = cnvrtDosUnixTm(
160                                 le16_to_cpu(pfindData->LastAccessDate),
161                                 le16_to_cpu(pfindData->LastAccessTime));
162                 tmp_inode->i_ctime = cnvrtDosUnixTm(
163                                 le16_to_cpu(pfindData->LastWriteDate),
164                                 le16_to_cpu(pfindData->LastWriteTime));
165                 AdjustForTZ(cifs_sb->tcon, tmp_inode);
166                 attr = le16_to_cpu(pfindData->Attributes);
167                 allocation_size = le32_to_cpu(pfindData->AllocationSize);
168                 end_of_file = le32_to_cpu(pfindData->DataSize);
169         }
170
171         /* Linux can not store file creation time unfortunately so ignore it */
172
173         cifsInfo->cifsAttrs = attr;
174 #ifdef CONFIG_CIFS_EXPERIMENTAL
175         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
176                 /* get more accurate mode via ACL - so force inode refresh */
177                 cifsInfo->time = 0;
178         } else
179 #endif /* CONFIG_CIFS_EXPERIMENTAL */
180                 cifsInfo->time = jiffies;
181
182         /* treat dos attribute of read-only as read-only mode bit e.g. 555? */
183         /* 2767 perms - indicate mandatory locking */
184                 /* BB fill in uid and gid here? with help from winbind?
185                    or retrieve from NTFS stream extended attribute */
186         if (atomic_read(&cifsInfo->inUse) == 0) {
187                 tmp_inode->i_uid = cifs_sb->mnt_uid;
188                 tmp_inode->i_gid = cifs_sb->mnt_gid;
189         }
190
191         if (attr & ATTR_DIRECTORY)
192                 default_mode = cifs_sb->mnt_dir_mode;
193         else
194                 default_mode = cifs_sb->mnt_file_mode;
195
196         /* set initial permissions */
197         if ((atomic_read(&cifsInfo->inUse) == 0) ||
198             (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0)
199                 tmp_inode->i_mode = default_mode;
200         else {
201                 /* just reenable write bits if !ATTR_READONLY */
202                 if ((tmp_inode->i_mode & S_IWUGO) == 0 &&
203                     (attr & ATTR_READONLY) == 0)
204                         tmp_inode->i_mode |= (S_IWUGO & default_mode);
205
206                 tmp_inode->i_mode &= ~S_IFMT;
207         }
208
209         /* clear write bits if ATTR_READONLY is set */
210         if (attr & ATTR_READONLY)
211                 tmp_inode->i_mode &= ~S_IWUGO;
212
213         /* set inode type */
214         if ((attr & ATTR_SYSTEM) &&
215             (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)) {
216                 if (end_of_file == 0)  {
217                         tmp_inode->i_mode |= S_IFIFO;
218                         *pobject_type = DT_FIFO;
219                 } else {
220                         /*
221                          * trying to get the type can be slow, so just call
222                          * this a regular file for now, and mark for reval
223                          */
224                         tmp_inode->i_mode |= S_IFREG;
225                         *pobject_type = DT_REG;
226                         cifsInfo->time = 0;
227                 }
228         } else {
229                 if (attr & ATTR_DIRECTORY) {
230                         tmp_inode->i_mode |= S_IFDIR;
231                         *pobject_type = DT_DIR;
232                 } else {
233                         tmp_inode->i_mode |= S_IFREG;
234                         *pobject_type = DT_REG;
235                 }
236         }
237
238         /* can not fill in nlink here as in qpathinfo version and Unx search */
239         if (atomic_read(&cifsInfo->inUse) == 0)
240                 atomic_set(&cifsInfo->inUse, 1);
241
242         spin_lock(&tmp_inode->i_lock);
243         if (is_size_safe_to_change(cifsInfo, end_of_file)) {
244                 /* can not safely change the file size here if the
245                 client is writing to it due to potential races */
246                 i_size_write(tmp_inode, end_of_file);
247
248         /* 512 bytes (2**9) is the fake blocksize that must be used */
249         /* for this calculation, even though the reported blocksize is larger */
250                 tmp_inode->i_blocks = (512 - 1 + allocation_size) >> 9;
251         }
252         spin_unlock(&tmp_inode->i_lock);
253
254         if (allocation_size < end_of_file)
255                 cFYI(1, ("May be sparse file, allocation less than file size"));
256         cFYI(1, ("File Size %ld and blocks %llu",
257                 (unsigned long)tmp_inode->i_size,
258                 (unsigned long long)tmp_inode->i_blocks));
259         if (S_ISREG(tmp_inode->i_mode)) {
260                 cFYI(1, ("File inode"));
261                 tmp_inode->i_op = &cifs_file_inode_ops;
262                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
263                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
264                                 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
265                         else
266                                 tmp_inode->i_fop = &cifs_file_direct_ops;
267                 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
268                         tmp_inode->i_fop = &cifs_file_nobrl_ops;
269                 else
270                         tmp_inode->i_fop = &cifs_file_ops;
271
272                 if ((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
273                    (cifs_sb->tcon->ses->server->maxBuf <
274                         PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
275                         tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
276                 else
277                         tmp_inode->i_data.a_ops = &cifs_addr_ops;
278
279                 if (isNewInode)
280                         return; /* No sense invalidating pages for new inode
281                                    since have not started caching readahead file
282                                    data yet */
283
284                 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
285                         (local_size == tmp_inode->i_size)) {
286                         cFYI(1, ("inode exists but unchanged"));
287                 } else {
288                         /* file may have changed on server */
289                         cFYI(1, ("invalidate inode, readdir detected change"));
290                         invalidate_remote_inode(tmp_inode);
291                 }
292         } else if (S_ISDIR(tmp_inode->i_mode)) {
293                 cFYI(1, ("Directory inode"));
294                 tmp_inode->i_op = &cifs_dir_inode_ops;
295                 tmp_inode->i_fop = &cifs_dir_ops;
296         } else if (S_ISLNK(tmp_inode->i_mode)) {
297                 cFYI(1, ("Symbolic Link inode"));
298                 tmp_inode->i_op = &cifs_symlink_inode_ops;
299         } else {
300                 cFYI(1, ("Init special inode"));
301                 init_special_inode(tmp_inode, tmp_inode->i_mode,
302                                    tmp_inode->i_rdev);
303         }
304 }
305
306 static void unix_fill_in_inode(struct inode *tmp_inode,
307         FILE_UNIX_INFO *pfindData, unsigned int *pobject_type, int isNewInode)
308 {
309         loff_t local_size;
310         struct timespec local_mtime;
311
312         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
313         struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
314
315         __u32 type = le32_to_cpu(pfindData->Type);
316         __u64 num_of_bytes = le64_to_cpu(pfindData->NumOfBytes);
317         __u64 end_of_file = le64_to_cpu(pfindData->EndOfFile);
318         cifsInfo->time = jiffies;
319         atomic_inc(&cifsInfo->inUse);
320
321         /* save mtime and size */
322         local_mtime = tmp_inode->i_mtime;
323         local_size  = tmp_inode->i_size;
324
325         tmp_inode->i_atime =
326             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
327         tmp_inode->i_mtime =
328             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastModificationTime));
329         tmp_inode->i_ctime =
330             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastStatusChange));
331
332         tmp_inode->i_mode = le64_to_cpu(pfindData->Permissions);
333         /* since we set the inode type below we need to mask off type
334            to avoid strange results if bits above were corrupt */
335         tmp_inode->i_mode &= ~S_IFMT;
336         if (type == UNIX_FILE) {
337                 *pobject_type = DT_REG;
338                 tmp_inode->i_mode |= S_IFREG;
339         } else if (type == UNIX_SYMLINK) {
340                 *pobject_type = DT_LNK;
341                 tmp_inode->i_mode |= S_IFLNK;
342         } else if (type == UNIX_DIR) {
343                 *pobject_type = DT_DIR;
344                 tmp_inode->i_mode |= S_IFDIR;
345         } else if (type == UNIX_CHARDEV) {
346                 *pobject_type = DT_CHR;
347                 tmp_inode->i_mode |= S_IFCHR;
348                 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
349                                 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
350         } else if (type == UNIX_BLOCKDEV) {
351                 *pobject_type = DT_BLK;
352                 tmp_inode->i_mode |= S_IFBLK;
353                 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
354                                 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
355         } else if (type == UNIX_FIFO) {
356                 *pobject_type = DT_FIFO;
357                 tmp_inode->i_mode |= S_IFIFO;
358         } else if (type == UNIX_SOCKET) {
359                 *pobject_type = DT_SOCK;
360                 tmp_inode->i_mode |= S_IFSOCK;
361         } else {
362                 /* safest to just call it a file */
363                 *pobject_type = DT_REG;
364                 tmp_inode->i_mode |= S_IFREG;
365                 cFYI(1, ("unknown inode type %d", type));
366         }
367
368         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
369                 tmp_inode->i_uid = cifs_sb->mnt_uid;
370         else
371                 tmp_inode->i_uid = le64_to_cpu(pfindData->Uid);
372         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
373                 tmp_inode->i_gid = cifs_sb->mnt_gid;
374         else
375                 tmp_inode->i_gid = le64_to_cpu(pfindData->Gid);
376         tmp_inode->i_nlink = le64_to_cpu(pfindData->Nlinks);
377
378         spin_lock(&tmp_inode->i_lock);
379         if (is_size_safe_to_change(cifsInfo, end_of_file)) {
380                 /* can not safely change the file size here if the
381                 client is writing to it due to potential races */
382                 i_size_write(tmp_inode, end_of_file);
383
384         /* 512 bytes (2**9) is the fake blocksize that must be used */
385         /* for this calculation, not the real blocksize */
386                 tmp_inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
387         }
388         spin_unlock(&tmp_inode->i_lock);
389
390         if (S_ISREG(tmp_inode->i_mode)) {
391                 cFYI(1, ("File inode"));
392                 tmp_inode->i_op = &cifs_file_inode_ops;
393
394                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
395                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
396                                 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
397                         else
398                                 tmp_inode->i_fop = &cifs_file_direct_ops;
399                 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
400                         tmp_inode->i_fop = &cifs_file_nobrl_ops;
401                 else
402                         tmp_inode->i_fop = &cifs_file_ops;
403
404                 if ((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
405                    (cifs_sb->tcon->ses->server->maxBuf <
406                         PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
407                         tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
408                 else
409                         tmp_inode->i_data.a_ops = &cifs_addr_ops;
410
411                 if (isNewInode)
412                         return; /* No sense invalidating pages for new inode
413                                    since we have not started caching readahead
414                                    file data for it yet */
415
416                 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
417                         (local_size == tmp_inode->i_size)) {
418                         cFYI(1, ("inode exists but unchanged"));
419                 } else {
420                         /* file may have changed on server */
421                         cFYI(1, ("invalidate inode, readdir detected change"));
422                         invalidate_remote_inode(tmp_inode);
423                 }
424         } else if (S_ISDIR(tmp_inode->i_mode)) {
425                 cFYI(1, ("Directory inode"));
426                 tmp_inode->i_op = &cifs_dir_inode_ops;
427                 tmp_inode->i_fop = &cifs_dir_ops;
428         } else if (S_ISLNK(tmp_inode->i_mode)) {
429                 cFYI(1, ("Symbolic Link inode"));
430                 tmp_inode->i_op = &cifs_symlink_inode_ops;
431 /* tmp_inode->i_fop = *//* do not need to set to anything */
432         } else {
433                 cFYI(1, ("Special inode"));
434                 init_special_inode(tmp_inode, tmp_inode->i_mode,
435                                    tmp_inode->i_rdev);
436         }
437 }
438
439 static int initiate_cifs_search(const int xid, struct file *file)
440 {
441         int rc = 0;
442         char *full_path;
443         struct cifsFileInfo *cifsFile;
444         struct cifs_sb_info *cifs_sb;
445         struct cifsTconInfo *pTcon;
446
447         if (file->private_data == NULL) {
448                 file->private_data =
449                         kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
450         }
451
452         if (file->private_data == NULL)
453                 return -ENOMEM;
454         cifsFile = file->private_data;
455         cifsFile->invalidHandle = true;
456         cifsFile->srch_inf.endOfSearch = false;
457
458         cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
459         if (cifs_sb == NULL)
460                 return -EINVAL;
461
462         pTcon = cifs_sb->tcon;
463         if (pTcon == NULL)
464                 return -EINVAL;
465
466         full_path = build_path_from_dentry(file->f_path.dentry);
467
468         if (full_path == NULL)
469                 return -ENOMEM;
470
471         cFYI(1, ("Full path: %s start at: %lld", full_path, file->f_pos));
472
473 ffirst_retry:
474         /* test for Unix extensions */
475         /* but now check for them on the share/mount not on the SMB session */
476 /*      if (pTcon->ses->capabilities & CAP_UNIX) { */
477         if (pTcon->unix_ext)
478                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
479         else if ((pTcon->ses->capabilities &
480                         (CAP_NT_SMBS | CAP_NT_FIND)) == 0) {
481                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD;
482         } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
483                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
484         } else /* not srvinos - BB fixme add check for backlevel? */ {
485                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
486         }
487
488         rc = CIFSFindFirst(xid, pTcon, full_path, cifs_sb->local_nls,
489                 &cifsFile->netfid, &cifsFile->srch_inf,
490                 cifs_sb->mnt_cifs_flags &
491                         CIFS_MOUNT_MAP_SPECIAL_CHR, CIFS_DIR_SEP(cifs_sb));
492         if (rc == 0)
493                 cifsFile->invalidHandle = false;
494         if ((rc == -EOPNOTSUPP) &&
495                 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
496                 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
497                 goto ffirst_retry;
498         }
499         kfree(full_path);
500         return rc;
501 }
502
503 /* return length of unicode string in bytes */
504 static int cifs_unicode_bytelen(char *str)
505 {
506         int len;
507         __le16 *ustr = (__le16 *)str;
508
509         for (len = 0; len <= PATH_MAX; len++) {
510                 if (ustr[len] == 0)
511                         return len << 1;
512         }
513         cFYI(1, ("Unicode string longer than PATH_MAX found"));
514         return len << 1;
515 }
516
517 static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level)
518 {
519         char *new_entry;
520         FILE_DIRECTORY_INFO *pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
521
522         if (level == SMB_FIND_FILE_INFO_STANDARD) {
523                 FIND_FILE_STANDARD_INFO *pfData;
524                 pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo;
525
526                 new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) +
527                                 pfData->FileNameLength;
528         } else
529                 new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
530         cFYI(1, ("new entry %p old entry %p", new_entry, old_entry));
531         /* validate that new_entry is not past end of SMB */
532         if (new_entry >= end_of_smb) {
533                 cERROR(1,
534                       ("search entry %p began after end of SMB %p old entry %p",
535                         new_entry, end_of_smb, old_entry));
536                 return NULL;
537         } else if (((level == SMB_FIND_FILE_INFO_STANDARD) &&
538                     (new_entry + sizeof(FIND_FILE_STANDARD_INFO) > end_of_smb))
539                   || ((level != SMB_FIND_FILE_INFO_STANDARD) &&
540                    (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb)))  {
541                 cERROR(1, ("search entry %p extends after end of SMB %p",
542                         new_entry, end_of_smb));
543                 return NULL;
544         } else
545                 return new_entry;
546
547 }
548
549 #define UNICODE_DOT cpu_to_le16(0x2e)
550
551 /* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
552 static int cifs_entry_is_dot(char *current_entry, struct cifsFileInfo *cfile)
553 {
554         int rc = 0;
555         char *filename = NULL;
556         int len = 0;
557
558         if (cfile->srch_inf.info_level == SMB_FIND_FILE_UNIX) {
559                 FILE_UNIX_INFO *pFindData = (FILE_UNIX_INFO *)current_entry;
560                 filename = &pFindData->FileName[0];
561                 if (cfile->srch_inf.unicode) {
562                         len = cifs_unicode_bytelen(filename);
563                 } else {
564                         /* BB should we make this strnlen of PATH_MAX? */
565                         len = strnlen(filename, 5);
566                 }
567         } else if (cfile->srch_inf.info_level == SMB_FIND_FILE_DIRECTORY_INFO) {
568                 FILE_DIRECTORY_INFO *pFindData =
569                         (FILE_DIRECTORY_INFO *)current_entry;
570                 filename = &pFindData->FileName[0];
571                 len = le32_to_cpu(pFindData->FileNameLength);
572         } else if (cfile->srch_inf.info_level ==
573                         SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
574                 FILE_FULL_DIRECTORY_INFO *pFindData =
575                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
576                 filename = &pFindData->FileName[0];
577                 len = le32_to_cpu(pFindData->FileNameLength);
578         } else if (cfile->srch_inf.info_level ==
579                         SMB_FIND_FILE_ID_FULL_DIR_INFO) {
580                 SEARCH_ID_FULL_DIR_INFO *pFindData =
581                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
582                 filename = &pFindData->FileName[0];
583                 len = le32_to_cpu(pFindData->FileNameLength);
584         } else if (cfile->srch_inf.info_level ==
585                         SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
586                 FILE_BOTH_DIRECTORY_INFO *pFindData =
587                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
588                 filename = &pFindData->FileName[0];
589                 len = le32_to_cpu(pFindData->FileNameLength);
590         } else if (cfile->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD) {
591                 FIND_FILE_STANDARD_INFO *pFindData =
592                         (FIND_FILE_STANDARD_INFO *)current_entry;
593                 filename = &pFindData->FileName[0];
594                 len = pFindData->FileNameLength;
595         } else {
596                 cFYI(1, ("Unknown findfirst level %d",
597                          cfile->srch_inf.info_level));
598         }
599
600         if (filename) {
601                 if (cfile->srch_inf.unicode) {
602                         __le16 *ufilename = (__le16 *)filename;
603                         if (len == 2) {
604                                 /* check for . */
605                                 if (ufilename[0] == UNICODE_DOT)
606                                         rc = 1;
607                         } else if (len == 4) {
608                                 /* check for .. */
609                                 if ((ufilename[0] == UNICODE_DOT)
610                                    && (ufilename[1] == UNICODE_DOT))
611                                         rc = 2;
612                         }
613                 } else /* ASCII */ {
614                         if (len == 1) {
615                                 if (filename[0] == '.')
616                                         rc = 1;
617                         } else if (len == 2) {
618                                 if ((filename[0] == '.') && (filename[1] == '.'))
619                                         rc = 2;
620                         }
621                 }
622         }
623
624         return rc;
625 }
626
627 /* Check if directory that we are searching has changed so we can decide
628    whether we can use the cached search results from the previous search */
629 static int is_dir_changed(struct file *file)
630 {
631         struct inode *inode = file->f_path.dentry->d_inode;
632         struct cifsInodeInfo *cifsInfo = CIFS_I(inode);
633
634         if (cifsInfo->time == 0)
635                 return 1; /* directory was changed, perhaps due to unlink */
636         else
637                 return 0;
638
639 }
640
641 static int cifs_save_resume_key(const char *current_entry,
642         struct cifsFileInfo *cifsFile)
643 {
644         int rc = 0;
645         unsigned int len = 0;
646         __u16 level;
647         char *filename;
648
649         if ((cifsFile == NULL) || (current_entry == NULL))
650                 return -EINVAL;
651
652         level = cifsFile->srch_inf.info_level;
653
654         if (level == SMB_FIND_FILE_UNIX) {
655                 FILE_UNIX_INFO *pFindData = (FILE_UNIX_INFO *)current_entry;
656
657                 filename = &pFindData->FileName[0];
658                 if (cifsFile->srch_inf.unicode) {
659                         len = cifs_unicode_bytelen(filename);
660                 } else {
661                         /* BB should we make this strnlen of PATH_MAX? */
662                         len = strnlen(filename, PATH_MAX);
663                 }
664                 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
665         } else if (level == SMB_FIND_FILE_DIRECTORY_INFO) {
666                 FILE_DIRECTORY_INFO *pFindData =
667                         (FILE_DIRECTORY_INFO *)current_entry;
668                 filename = &pFindData->FileName[0];
669                 len = le32_to_cpu(pFindData->FileNameLength);
670                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
671         } else if (level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
672                 FILE_FULL_DIRECTORY_INFO *pFindData =
673                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
674                 filename = &pFindData->FileName[0];
675                 len = le32_to_cpu(pFindData->FileNameLength);
676                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
677         } else if (level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
678                 SEARCH_ID_FULL_DIR_INFO *pFindData =
679                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
680                 filename = &pFindData->FileName[0];
681                 len = le32_to_cpu(pFindData->FileNameLength);
682                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
683         } else if (level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
684                 FILE_BOTH_DIRECTORY_INFO *pFindData =
685                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
686                 filename = &pFindData->FileName[0];
687                 len = le32_to_cpu(pFindData->FileNameLength);
688                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
689         } else if (level == SMB_FIND_FILE_INFO_STANDARD) {
690                 FIND_FILE_STANDARD_INFO *pFindData =
691                         (FIND_FILE_STANDARD_INFO *)current_entry;
692                 filename = &pFindData->FileName[0];
693                 /* one byte length, no name conversion */
694                 len = (unsigned int)pFindData->FileNameLength;
695                 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
696         } else {
697                 cFYI(1, ("Unknown findfirst level %d", level));
698                 return -EINVAL;
699         }
700         cifsFile->srch_inf.resume_name_len = len;
701         cifsFile->srch_inf.presume_name = filename;
702         return rc;
703 }
704
705 /* find the corresponding entry in the search */
706 /* Note that the SMB server returns search entries for . and .. which
707    complicates logic here if we choose to parse for them and we do not
708    assume that they are located in the findfirst return buffer.*/
709 /* We start counting in the buffer with entry 2 and increment for every
710    entry (do not increment for . or .. entry) */
711 static int find_cifs_entry(const int xid, struct cifsTconInfo *pTcon,
712         struct file *file, char **ppCurrentEntry, int *num_to_ret)
713 {
714         int rc = 0;
715         int pos_in_buf = 0;
716         loff_t first_entry_in_buffer;
717         loff_t index_to_find = file->f_pos;
718         struct cifsFileInfo *cifsFile = file->private_data;
719         /* check if index in the buffer */
720
721         if ((cifsFile == NULL) || (ppCurrentEntry == NULL) ||
722            (num_to_ret == NULL))
723                 return -ENOENT;
724
725         *ppCurrentEntry = NULL;
726         first_entry_in_buffer =
727                 cifsFile->srch_inf.index_of_last_entry -
728                         cifsFile->srch_inf.entries_in_buffer;
729
730         /* if first entry in buf is zero then is first buffer
731         in search response data which means it is likely . and ..
732         will be in this buffer, although some servers do not return
733         . and .. for the root of a drive and for those we need
734         to start two entries earlier */
735
736         dump_cifs_file_struct(file, "In fce ");
737         if (((index_to_find < cifsFile->srch_inf.index_of_last_entry) &&
738              is_dir_changed(file)) ||
739            (index_to_find < first_entry_in_buffer)) {
740                 /* close and restart search */
741                 cFYI(1, ("search backing up - close and restart search"));
742                 write_lock(&GlobalSMBSeslock);
743                 if (!cifsFile->srch_inf.endOfSearch &&
744                     !cifsFile->invalidHandle) {
745                         cifsFile->invalidHandle = true;
746                         write_unlock(&GlobalSMBSeslock);
747                         CIFSFindClose(xid, pTcon, cifsFile->netfid);
748                 } else
749                         write_unlock(&GlobalSMBSeslock);
750                 if (cifsFile->srch_inf.ntwrk_buf_start) {
751                         cFYI(1, ("freeing SMB ff cache buf on search rewind"));
752                         if (cifsFile->srch_inf.smallBuf)
753                                 cifs_small_buf_release(cifsFile->srch_inf.
754                                                 ntwrk_buf_start);
755                         else
756                                 cifs_buf_release(cifsFile->srch_inf.
757                                                 ntwrk_buf_start);
758                         cifsFile->srch_inf.ntwrk_buf_start = NULL;
759                 }
760                 rc = initiate_cifs_search(xid, file);
761                 if (rc) {
762                         cFYI(1, ("error %d reinitiating a search on rewind",
763                                  rc));
764                         return rc;
765                 }
766                 cifs_save_resume_key(cifsFile->srch_inf.last_entry, cifsFile);
767         }
768
769         while ((index_to_find >= cifsFile->srch_inf.index_of_last_entry) &&
770               (rc == 0) && !cifsFile->srch_inf.endOfSearch) {
771                 cFYI(1, ("calling findnext2"));
772                 rc = CIFSFindNext(xid, pTcon, cifsFile->netfid,
773                                   &cifsFile->srch_inf);
774                 cifs_save_resume_key(cifsFile->srch_inf.last_entry, cifsFile);
775                 if (rc)
776                         return -ENOENT;
777         }
778         if (index_to_find < cifsFile->srch_inf.index_of_last_entry) {
779                 /* we found the buffer that contains the entry */
780                 /* scan and find it */
781                 int i;
782                 char *current_entry;
783                 char *end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
784                         smbCalcSize((struct smb_hdr *)
785                                 cifsFile->srch_inf.ntwrk_buf_start);
786
787                 current_entry = cifsFile->srch_inf.srch_entries_start;
788                 first_entry_in_buffer = cifsFile->srch_inf.index_of_last_entry
789                                         - cifsFile->srch_inf.entries_in_buffer;
790                 pos_in_buf = index_to_find - first_entry_in_buffer;
791                 cFYI(1, ("found entry - pos_in_buf %d", pos_in_buf));
792
793                 for (i = 0; (i < (pos_in_buf)) && (current_entry != NULL); i++) {
794                         /* go entry by entry figuring out which is first */
795                         current_entry = nxt_dir_entry(current_entry, end_of_smb,
796                                                 cifsFile->srch_inf.info_level);
797                 }
798                 if ((current_entry == NULL) && (i < pos_in_buf)) {
799                         /* BB fixme - check if we should flag this error */
800                         cERROR(1, ("reached end of buf searching for pos in buf"
801                           " %d index to find %lld rc %d",
802                           pos_in_buf, index_to_find, rc));
803                 }
804                 rc = 0;
805                 *ppCurrentEntry = current_entry;
806         } else {
807                 cFYI(1, ("index not in buffer - could not findnext into it"));
808                 return 0;
809         }
810
811         if (pos_in_buf >= cifsFile->srch_inf.entries_in_buffer) {
812                 cFYI(1, ("can not return entries pos_in_buf beyond last"));
813                 *num_to_ret = 0;
814         } else
815                 *num_to_ret = cifsFile->srch_inf.entries_in_buffer - pos_in_buf;
816
817         return rc;
818 }
819
820 /* inode num, inode type and filename returned */
821 static int cifs_get_name_from_search_buf(struct qstr *pqst,
822         char *current_entry, __u16 level, unsigned int unicode,
823         struct cifs_sb_info *cifs_sb, int max_len, __u64 *pinum)
824 {
825         int rc = 0;
826         unsigned int len = 0;
827         char *filename;
828         struct nls_table *nlt = cifs_sb->local_nls;
829
830         *pinum = 0;
831
832         if (level == SMB_FIND_FILE_UNIX) {
833                 FILE_UNIX_INFO *pFindData = (FILE_UNIX_INFO *)current_entry;
834
835                 filename = &pFindData->FileName[0];
836                 if (unicode) {
837                         len = cifs_unicode_bytelen(filename);
838                 } else {
839                         /* BB should we make this strnlen of PATH_MAX? */
840                         len = strnlen(filename, PATH_MAX);
841                 }
842
843                 *pinum = pFindData->UniqueId;
844         } else if (level == SMB_FIND_FILE_DIRECTORY_INFO) {
845                 FILE_DIRECTORY_INFO *pFindData =
846                         (FILE_DIRECTORY_INFO *)current_entry;
847                 filename = &pFindData->FileName[0];
848                 len = le32_to_cpu(pFindData->FileNameLength);
849         } else if (level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
850                 FILE_FULL_DIRECTORY_INFO *pFindData =
851                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
852                 filename = &pFindData->FileName[0];
853                 len = le32_to_cpu(pFindData->FileNameLength);
854         } else if (level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
855                 SEARCH_ID_FULL_DIR_INFO *pFindData =
856                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
857                 filename = &pFindData->FileName[0];
858                 len = le32_to_cpu(pFindData->FileNameLength);
859                 *pinum = pFindData->UniqueId;
860         } else if (level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
861                 FILE_BOTH_DIRECTORY_INFO *pFindData =
862                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
863                 filename = &pFindData->FileName[0];
864                 len = le32_to_cpu(pFindData->FileNameLength);
865         } else if (level == SMB_FIND_FILE_INFO_STANDARD) {
866                 FIND_FILE_STANDARD_INFO *pFindData =
867                         (FIND_FILE_STANDARD_INFO *)current_entry;
868                 filename = &pFindData->FileName[0];
869                 /* one byte length, no name conversion */
870                 len = (unsigned int)pFindData->FileNameLength;
871         } else {
872                 cFYI(1, ("Unknown findfirst level %d", level));
873                 return -EINVAL;
874         }
875
876         if (len > max_len) {
877                 cERROR(1, ("bad search response length %d past smb end", len));
878                 return -EINVAL;
879         }
880
881         if (unicode) {
882                 /* BB fixme - test with long names */
883                 /* Note converted filename can be longer than in unicode */
884                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
885                         pqst->len = cifs_convertUCSpath((char *)pqst->name,
886                                         (__le16 *)filename, len/2, nlt);
887                 else
888                         pqst->len = cifs_strfromUCS_le((char *)pqst->name,
889                                         (__le16 *)filename, len/2, nlt);
890         } else {
891                 pqst->name = filename;
892                 pqst->len = len;
893         }
894         pqst->hash = full_name_hash(pqst->name, pqst->len);
895 /*      cFYI(1, ("filldir on %s",pqst->name));  */
896         return rc;
897 }
898
899 static int cifs_filldir(char *pfindEntry, struct file *file,
900         filldir_t filldir, void *direntry, char *scratch_buf, int max_len)
901 {
902         int rc = 0;
903         struct qstr qstring;
904         struct cifsFileInfo *pCifsF;
905         unsigned int obj_type;
906         __u64  inum;
907         struct cifs_sb_info *cifs_sb;
908         struct inode *tmp_inode;
909         struct dentry *tmp_dentry;
910
911         /* get filename and len into qstring */
912         /* get dentry */
913         /* decide whether to create and populate ionde */
914         if ((direntry == NULL) || (file == NULL))
915                 return -EINVAL;
916
917         pCifsF = file->private_data;
918
919         if ((scratch_buf == NULL) || (pfindEntry == NULL) || (pCifsF == NULL))
920                 return -ENOENT;
921
922         rc = cifs_entry_is_dot(pfindEntry, pCifsF);
923         /* skip . and .. since we added them first */
924         if (rc != 0)
925                 return 0;
926
927         cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
928
929         qstring.name = scratch_buf;
930         rc = cifs_get_name_from_search_buf(&qstring, pfindEntry,
931                         pCifsF->srch_inf.info_level,
932                         pCifsF->srch_inf.unicode, cifs_sb,
933                         max_len,
934                         &inum /* returned */);
935
936         if (rc)
937                 return rc;
938
939         /* only these two infolevels return valid inode numbers */
940         if (pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX ||
941             pCifsF->srch_inf.info_level == SMB_FIND_FILE_ID_FULL_DIR_INFO)
942                 rc = construct_dentry(&qstring, file, &tmp_inode, &tmp_dentry,
943                                         &inum);
944         else
945                 rc = construct_dentry(&qstring, file, &tmp_inode, &tmp_dentry,
946                                         NULL);
947
948         if ((tmp_inode == NULL) || (tmp_dentry == NULL))
949                 return -ENOMEM;
950
951         /* we pass in rc below, indicating whether it is a new inode,
952            so we can figure out whether to invalidate the inode cached
953            data if the file has changed */
954         if (pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX)
955                 unix_fill_in_inode(tmp_inode,
956                                    (FILE_UNIX_INFO *)pfindEntry,
957                                    &obj_type, rc);
958         else if (pCifsF->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD)
959                 fill_in_inode(tmp_inode, 0 /* old level 1 buffer type */,
960                                 pfindEntry, &obj_type, rc);
961         else
962                 fill_in_inode(tmp_inode, 1 /* NT */, pfindEntry, &obj_type, rc);
963
964         if (rc) /* new inode - needs to be tied to dentry */ {
965                 d_instantiate(tmp_dentry, tmp_inode);
966                 if (rc == 2)
967                         d_rehash(tmp_dentry);
968         }
969
970
971         rc = filldir(direntry, qstring.name, qstring.len, file->f_pos,
972                      tmp_inode->i_ino, obj_type);
973         if (rc) {
974                 cFYI(1, ("filldir rc = %d", rc));
975                 /* we can not return filldir errors to the caller
976                 since they are "normal" when the stat blocksize
977                 is too small - we return remapped error instead */
978                 rc = -EOVERFLOW;
979         }
980
981         dput(tmp_dentry);
982         return rc;
983 }
984
985
986 int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
987 {
988         int rc = 0;
989         int xid, i;
990         struct cifs_sb_info *cifs_sb;
991         struct cifsTconInfo *pTcon;
992         struct cifsFileInfo *cifsFile = NULL;
993         char *current_entry;
994         int num_to_fill = 0;
995         char *tmp_buf = NULL;
996         char *end_of_smb;
997         int max_len;
998
999         xid = GetXid();
1000
1001         cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
1002         pTcon = cifs_sb->tcon;
1003         if (pTcon == NULL)
1004                 return -EINVAL;
1005
1006         switch ((int) file->f_pos) {
1007         case 0:
1008                 if (filldir(direntry, ".", 1, file->f_pos,
1009                      file->f_path.dentry->d_inode->i_ino, DT_DIR) < 0) {
1010                         cERROR(1, ("Filldir for current dir failed"));
1011                         rc = -ENOMEM;
1012                         break;
1013                 }
1014                 file->f_pos++;
1015         case 1:
1016                 if (filldir(direntry, "..", 2, file->f_pos,
1017                      file->f_path.dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) {
1018                         cERROR(1, ("Filldir for parent dir failed"));
1019                         rc = -ENOMEM;
1020                         break;
1021                 }
1022                 file->f_pos++;
1023         default:
1024                 /* 1) If search is active,
1025                         is in current search buffer?
1026                         if it before then restart search
1027                         if after then keep searching till find it */
1028
1029                 if (file->private_data == NULL) {
1030                         rc = initiate_cifs_search(xid, file);
1031                         cFYI(1, ("initiate cifs search rc %d", rc));
1032                         if (rc) {
1033                                 FreeXid(xid);
1034                                 return rc;
1035                         }
1036                 }
1037                 if (file->private_data == NULL) {
1038                         rc = -EINVAL;
1039                         FreeXid(xid);
1040                         return rc;
1041                 }
1042                 cifsFile = file->private_data;
1043                 if (cifsFile->srch_inf.endOfSearch) {
1044                         if (cifsFile->srch_inf.emptyDir) {
1045                                 cFYI(1, ("End of search, empty dir"));
1046                                 rc = 0;
1047                                 break;
1048                         }
1049                 } /* else {
1050                         cifsFile->invalidHandle = true;
1051                         CIFSFindClose(xid, pTcon, cifsFile->netfid);
1052                 } */
1053
1054                 rc = find_cifs_entry(xid, pTcon, file,
1055                                 &current_entry, &num_to_fill);
1056                 if (rc) {
1057                         cFYI(1, ("fce error %d", rc));
1058                         goto rddir2_exit;
1059                 } else if (current_entry != NULL) {
1060                         cFYI(1, ("entry %lld found", file->f_pos));
1061                 } else {
1062                         cFYI(1, ("could not find entry"));
1063                         goto rddir2_exit;
1064                 }
1065                 cFYI(1, ("loop through %d times filling dir for net buf %p",
1066                         num_to_fill, cifsFile->srch_inf.ntwrk_buf_start));
1067                 max_len = smbCalcSize((struct smb_hdr *)
1068                                 cifsFile->srch_inf.ntwrk_buf_start);
1069                 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len;
1070
1071                 /* To be safe - for UCS to UTF-8 with strings loaded
1072                 with the rare long characters alloc more to account for
1073                 such multibyte target UTF-8 characters. cifs_unicode.c,
1074                 which actually does the conversion, has the same limit */
1075                 tmp_buf = kmalloc((2 * NAME_MAX) + 4, GFP_KERNEL);
1076                 for (i = 0; (i < num_to_fill) && (rc == 0); i++) {
1077                         if (current_entry == NULL) {
1078                                 /* evaluate whether this case is an error */
1079                                 cERROR(1, ("past SMB end,  num to fill %d i %d",
1080                                           num_to_fill, i));
1081                                 break;
1082                         }
1083                         /* if buggy server returns . and .. late do
1084                         we want to check for that here? */
1085                         rc = cifs_filldir(current_entry, file,
1086                                         filldir, direntry, tmp_buf, max_len);
1087                         if (rc == -EOVERFLOW) {
1088                                 rc = 0;
1089                                 break;
1090                         }
1091
1092                         file->f_pos++;
1093                         if (file->f_pos ==
1094                                 cifsFile->srch_inf.index_of_last_entry) {
1095                                 cFYI(1, ("last entry in buf at pos %lld %s",
1096                                         file->f_pos, tmp_buf));
1097                                 cifs_save_resume_key(current_entry, cifsFile);
1098                                 break;
1099                         } else
1100                                 current_entry =
1101                                         nxt_dir_entry(current_entry, end_of_smb,
1102                                                 cifsFile->srch_inf.info_level);
1103                 }
1104                 kfree(tmp_buf);
1105                 break;
1106         } /* end switch */
1107
1108 rddir2_exit:
1109         FreeXid(xid);
1110         return rc;
1111 }