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x86: Fix fixmap page order for FIX_TEXT_POKE0,1
[linux-2.6/mini2440.git] / fs / cifs / readdir.c
blob964e097c82035b75f865275f3f7c6b45b3c69a63
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 /*
35 * To be safe - for UCS to UTF-8 with strings loaded with the rare long
36 * characters alloc more to account for such multibyte target UTF-8
37 * characters.
38 */
39 #define UNICODE_NAME_MAX ((4 * NAME_MAX) + 2)
40
41 #ifdef CONFIG_CIFS_DEBUG2
42 static void dump_cifs_file_struct(struct file *file, char *label)
43 {
44 struct cifsFileInfo *cf;
45
46 if (file) {
47 cf = file->private_data;
48 if (cf == NULL) {
49 cFYI(1, ("empty cifs private file data"));
50 return;
51 }
52 if (cf->invalidHandle)
53 cFYI(1, ("invalid handle"));
54 if (cf->srch_inf.endOfSearch)
55 cFYI(1, ("end of search"));
56 if (cf->srch_inf.emptyDir)
57 cFYI(1, ("empty dir"));
58 }
59 }
60 #else
61 static inline void dump_cifs_file_struct(struct file *file, char *label)
62 {
63 }
64 #endif /* DEBUG2 */
65
66 /* Returns 1 if new inode created, 2 if both dentry and inode were */
67 /* Might check in the future if inode number changed so we can rehash inode */
68 static int
69 construct_dentry(struct qstr *qstring, struct file *file,
70 struct inode **ptmp_inode, struct dentry **pnew_dentry,
71 __u64 *inum)
72 {
73 struct dentry *tmp_dentry = NULL;
74 struct super_block *sb = file->f_path.dentry->d_sb;
75 int rc = 0;
76
77 cFYI(1, ("For %s", qstring->name));
78
79 qstring->hash = full_name_hash(qstring->name, qstring->len);
80 tmp_dentry = d_lookup(file->f_path.dentry, qstring);
81 if (tmp_dentry) {
82 /* BB: overwrite old name? i.e. tmp_dentry->d_name and
83 * tmp_dentry->d_name.len??
84 */
85 cFYI(0, ("existing dentry with inode 0x%p",
86 tmp_dentry->d_inode));
87 *ptmp_inode = tmp_dentry->d_inode;
88 if (*ptmp_inode == NULL) {
89 *ptmp_inode = cifs_new_inode(sb, inum);
90 if (*ptmp_inode == NULL)
91 return rc;
92 rc = 1;
93 }
94 } else {
95 tmp_dentry = d_alloc(file->f_path.dentry, qstring);
96 if (tmp_dentry == NULL) {
97 cERROR(1, ("Failed allocating dentry"));
98 *ptmp_inode = NULL;
99 return rc;
100 }
101
102 if (CIFS_SB(sb)->tcon->nocase)
103 tmp_dentry->d_op = &cifs_ci_dentry_ops;
104 else
105 tmp_dentry->d_op = &cifs_dentry_ops;
106
107 *ptmp_inode = cifs_new_inode(sb, inum);
108 if (*ptmp_inode == NULL)
109 return rc;
110 rc = 2;
111 }
112
113 tmp_dentry->d_time = jiffies;
114 *pnew_dentry = tmp_dentry;
115 return rc;
116 }
117
118 static void AdjustForTZ(struct cifsTconInfo *tcon, struct inode *inode)
119 {
120 if ((tcon) && (tcon->ses) && (tcon->ses->server)) {
121 inode->i_ctime.tv_sec += tcon->ses->server->timeAdj;
122 inode->i_mtime.tv_sec += tcon->ses->server->timeAdj;
123 inode->i_atime.tv_sec += tcon->ses->server->timeAdj;
124 }
125 return;
126 }
127
128
129 static void fill_in_inode(struct inode *tmp_inode, int new_buf_type,
130 char *buf, unsigned int *pobject_type, int isNewInode)
131 {
132 loff_t local_size;
133 struct timespec local_mtime;
134
135 struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
136 struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
137 __u32 attr;
138 __u64 allocation_size;
139 __u64 end_of_file;
140 umode_t default_mode;
141
142 /* save mtime and size */
143 local_mtime = tmp_inode->i_mtime;
144 local_size = tmp_inode->i_size;
145
146 if (new_buf_type) {
147 FILE_DIRECTORY_INFO *pfindData = (FILE_DIRECTORY_INFO *)buf;
148
149 attr = le32_to_cpu(pfindData->ExtFileAttributes);
150 allocation_size = le64_to_cpu(pfindData->AllocationSize);
151 end_of_file = le64_to_cpu(pfindData->EndOfFile);
152 tmp_inode->i_atime =
153 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
154 tmp_inode->i_mtime =
155 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
156 tmp_inode->i_ctime =
157 cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
158 } else { /* legacy, OS2 and DOS style */
159 /* struct timespec ts;*/
160 FIND_FILE_STANDARD_INFO *pfindData =
161 (FIND_FILE_STANDARD_INFO *)buf;
162
163 tmp_inode->i_mtime = cnvrtDosUnixTm(
164 le16_to_cpu(pfindData->LastWriteDate),
165 le16_to_cpu(pfindData->LastWriteTime));
166 tmp_inode->i_atime = cnvrtDosUnixTm(
167 le16_to_cpu(pfindData->LastAccessDate),
168 le16_to_cpu(pfindData->LastAccessTime));
169 tmp_inode->i_ctime = cnvrtDosUnixTm(
170 le16_to_cpu(pfindData->LastWriteDate),
171 le16_to_cpu(pfindData->LastWriteTime));
172 AdjustForTZ(cifs_sb->tcon, tmp_inode);
173 attr = le16_to_cpu(pfindData->Attributes);
174 allocation_size = le32_to_cpu(pfindData->AllocationSize);
175 end_of_file = le32_to_cpu(pfindData->DataSize);
176 }
177
178 /* Linux can not store file creation time unfortunately so ignore it */
179
180 cifsInfo->cifsAttrs = attr;
181 #ifdef CONFIG_CIFS_EXPERIMENTAL
182 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
183 /* get more accurate mode via ACL - so force inode refresh */
184 cifsInfo->time = 0;
185 } else
186 #endif /* CONFIG_CIFS_EXPERIMENTAL */
187 cifsInfo->time = jiffies;
188
189 /* treat dos attribute of read-only as read-only mode bit e.g. 555? */
190 /* 2767 perms - indicate mandatory locking */
191 /* BB fill in uid and gid here? with help from winbind?
192 or retrieve from NTFS stream extended attribute */
193 if (atomic_read(&cifsInfo->inUse) == 0) {
194 tmp_inode->i_uid = cifs_sb->mnt_uid;
195 tmp_inode->i_gid = cifs_sb->mnt_gid;
196 }
197
198 if (attr & ATTR_DIRECTORY)
199 default_mode = cifs_sb->mnt_dir_mode;
200 else
201 default_mode = cifs_sb->mnt_file_mode;
202
203 /* set initial permissions */
204 if ((atomic_read(&cifsInfo->inUse) == 0) ||
205 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0)
206 tmp_inode->i_mode = default_mode;
207 else {
208 /* just reenable write bits if !ATTR_READONLY */
209 if ((tmp_inode->i_mode & S_IWUGO) == 0 &&
210 (attr & ATTR_READONLY) == 0)
211 tmp_inode->i_mode |= (S_IWUGO & default_mode);
212
213 tmp_inode->i_mode &= ~S_IFMT;
214 }
215
216 /* clear write bits if ATTR_READONLY is set */
217 if (attr & ATTR_READONLY)
218 tmp_inode->i_mode &= ~S_IWUGO;
219
220 /* set inode type */
221 if ((attr & ATTR_SYSTEM) &&
222 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)) {
223 if (end_of_file == 0) {
224 tmp_inode->i_mode |= S_IFIFO;
225 *pobject_type = DT_FIFO;
226 } else {
227 /*
228 * trying to get the type can be slow, so just call
229 * this a regular file for now, and mark for reval
230 */
231 tmp_inode->i_mode |= S_IFREG;
232 *pobject_type = DT_REG;
233 cifsInfo->time = 0;
234 }
235 } else {
236 if (attr & ATTR_DIRECTORY) {
237 tmp_inode->i_mode |= S_IFDIR;
238 *pobject_type = DT_DIR;
239 } else {
240 tmp_inode->i_mode |= S_IFREG;
241 *pobject_type = DT_REG;
242 }
243 }
244
245 /* can not fill in nlink here as in qpathinfo version and Unx search */
246 if (atomic_read(&cifsInfo->inUse) == 0)
247 atomic_set(&cifsInfo->inUse, 1);
248
249 cifsInfo->server_eof = end_of_file;
250 spin_lock(&tmp_inode->i_lock);
251 if (is_size_safe_to_change(cifsInfo, end_of_file)) {
252 /* can not safely change the file size here if the
253 client is writing to it due to potential races */
254 i_size_write(tmp_inode, end_of_file);
255
256 /* 512 bytes (2**9) is the fake blocksize that must be used */
257 /* for this calculation, even though the reported blocksize is larger */
258 tmp_inode->i_blocks = (512 - 1 + allocation_size) >> 9;
259 }
260 spin_unlock(&tmp_inode->i_lock);
261
262 if (allocation_size < end_of_file)
263 cFYI(1, ("May be sparse file, allocation less than file size"));
264 cFYI(1, ("File Size %ld and blocks %llu",
265 (unsigned long)tmp_inode->i_size,
266 (unsigned long long)tmp_inode->i_blocks));
267 if (S_ISREG(tmp_inode->i_mode)) {
268 cFYI(1, ("File inode"));
269 tmp_inode->i_op = &cifs_file_inode_ops;
270 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
271 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
272 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
273 else
274 tmp_inode->i_fop = &cifs_file_direct_ops;
275 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
276 tmp_inode->i_fop = &cifs_file_nobrl_ops;
277 else
278 tmp_inode->i_fop = &cifs_file_ops;
279
280 if ((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
281 (cifs_sb->tcon->ses->server->maxBuf <
282 PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
283 tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
284 else
285 tmp_inode->i_data.a_ops = &cifs_addr_ops;
286
287 if (isNewInode)
288 return; /* No sense invalidating pages for new inode
289 since have not started caching readahead file
290 data yet */
291
292 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
293 (local_size == tmp_inode->i_size)) {
294 cFYI(1, ("inode exists but unchanged"));
295 } else {
296 /* file may have changed on server */
297 cFYI(1, ("invalidate inode, readdir detected change"));
298 invalidate_remote_inode(tmp_inode);
299 }
300 } else if (S_ISDIR(tmp_inode->i_mode)) {
301 cFYI(1, ("Directory inode"));
302 tmp_inode->i_op = &cifs_dir_inode_ops;
303 tmp_inode->i_fop = &cifs_dir_ops;
304 } else if (S_ISLNK(tmp_inode->i_mode)) {
305 cFYI(1, ("Symbolic Link inode"));
306 tmp_inode->i_op = &cifs_symlink_inode_ops;
307 } else {
308 cFYI(1, ("Init special inode"));
309 init_special_inode(tmp_inode, tmp_inode->i_mode,
310 tmp_inode->i_rdev);
311 }
312 }
313
314 static void unix_fill_in_inode(struct inode *tmp_inode,
315 FILE_UNIX_INFO *pfindData, unsigned int *pobject_type, int isNewInode)
316 {
317 loff_t local_size;
318 struct timespec local_mtime;
319
320 struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
321 struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
322
323 __u32 type = le32_to_cpu(pfindData->Type);
324 __u64 num_of_bytes = le64_to_cpu(pfindData->NumOfBytes);
325 __u64 end_of_file = le64_to_cpu(pfindData->EndOfFile);
326 cifsInfo->time = jiffies;
327 atomic_inc(&cifsInfo->inUse);
328
329 /* save mtime and size */
330 local_mtime = tmp_inode->i_mtime;
331 local_size = tmp_inode->i_size;
332
333 tmp_inode->i_atime =
334 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
335 tmp_inode->i_mtime =
336 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastModificationTime));
337 tmp_inode->i_ctime =
338 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastStatusChange));
339
340 tmp_inode->i_mode = le64_to_cpu(pfindData->Permissions);
341 /* since we set the inode type below we need to mask off type
342 to avoid strange results if bits above were corrupt */
343 tmp_inode->i_mode &= ~S_IFMT;
344 if (type == UNIX_FILE) {
345 *pobject_type = DT_REG;
346 tmp_inode->i_mode |= S_IFREG;
347 } else if (type == UNIX_SYMLINK) {
348 *pobject_type = DT_LNK;
349 tmp_inode->i_mode |= S_IFLNK;
350 } else if (type == UNIX_DIR) {
351 *pobject_type = DT_DIR;
352 tmp_inode->i_mode |= S_IFDIR;
353 } else if (type == UNIX_CHARDEV) {
354 *pobject_type = DT_CHR;
355 tmp_inode->i_mode |= S_IFCHR;
356 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
357 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
358 } else if (type == UNIX_BLOCKDEV) {
359 *pobject_type = DT_BLK;
360 tmp_inode->i_mode |= S_IFBLK;
361 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
362 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
363 } else if (type == UNIX_FIFO) {
364 *pobject_type = DT_FIFO;
365 tmp_inode->i_mode |= S_IFIFO;
366 } else if (type == UNIX_SOCKET) {
367 *pobject_type = DT_SOCK;
368 tmp_inode->i_mode |= S_IFSOCK;
369 } else {
370 /* safest to just call it a file */
371 *pobject_type = DT_REG;
372 tmp_inode->i_mode |= S_IFREG;
373 cFYI(1, ("unknown inode type %d", type));
374 }
375
376 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
377 tmp_inode->i_uid = cifs_sb->mnt_uid;
378 else
379 tmp_inode->i_uid = le64_to_cpu(pfindData->Uid);
380 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
381 tmp_inode->i_gid = cifs_sb->mnt_gid;
382 else
383 tmp_inode->i_gid = le64_to_cpu(pfindData->Gid);
384 tmp_inode->i_nlink = le64_to_cpu(pfindData->Nlinks);
385
386 cifsInfo->server_eof = end_of_file;
387 spin_lock(&tmp_inode->i_lock);
388 if (is_size_safe_to_change(cifsInfo, end_of_file)) {
389 /* can not safely change the file size here if the
390 client is writing to it due to potential races */
391 i_size_write(tmp_inode, end_of_file);
392
393 /* 512 bytes (2**9) is the fake blocksize that must be used */
394 /* for this calculation, not the real blocksize */
395 tmp_inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
396 }
397 spin_unlock(&tmp_inode->i_lock);
398
399 if (S_ISREG(tmp_inode->i_mode)) {
400 cFYI(1, ("File inode"));
401 tmp_inode->i_op = &cifs_file_inode_ops;
402
403 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
404 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
405 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
406 else
407 tmp_inode->i_fop = &cifs_file_direct_ops;
408 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
409 tmp_inode->i_fop = &cifs_file_nobrl_ops;
410 else
411 tmp_inode->i_fop = &cifs_file_ops;
412
413 if ((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
414 (cifs_sb->tcon->ses->server->maxBuf <
415 PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
416 tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
417 else
418 tmp_inode->i_data.a_ops = &cifs_addr_ops;
419
420 if (isNewInode)
421 return; /* No sense invalidating pages for new inode
422 since we have not started caching readahead
423 file data for it yet */
424
425 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
426 (local_size == tmp_inode->i_size)) {
427 cFYI(1, ("inode exists but unchanged"));
428 } else {
429 /* file may have changed on server */
430 cFYI(1, ("invalidate inode, readdir detected change"));
431 invalidate_remote_inode(tmp_inode);
432 }
433 } else if (S_ISDIR(tmp_inode->i_mode)) {
434 cFYI(1, ("Directory inode"));
435 tmp_inode->i_op = &cifs_dir_inode_ops;
436 tmp_inode->i_fop = &cifs_dir_ops;
437 } else if (S_ISLNK(tmp_inode->i_mode)) {
438 cFYI(1, ("Symbolic Link inode"));
439 tmp_inode->i_op = &cifs_symlink_inode_ops;
440 /* tmp_inode->i_fop = *//* do not need to set to anything */
441 } else {
442 cFYI(1, ("Special inode"));
443 init_special_inode(tmp_inode, tmp_inode->i_mode,
444 tmp_inode->i_rdev);
445 }
446 }
447
448 /* BB eventually need to add the following helper function to
449 resolve NT_STATUS_STOPPED_ON_SYMLINK return code when
450 we try to do FindFirst on (NTFS) directory symlinks */
451 /*
452 int get_symlink_reparse_path(char *full_path, struct cifs_sb_info *cifs_sb,
453 int xid)
454 {
455 __u16 fid;
456 int len;
457 int oplock = 0;
458 int rc;
459 struct cifsTconInfo *ptcon = cifs_sb->tcon;
460 char *tmpbuffer;
461
462 rc = CIFSSMBOpen(xid, ptcon, full_path, FILE_OPEN, GENERIC_READ,
463 OPEN_REPARSE_POINT, &fid, &oplock, NULL,
464 cifs_sb->local_nls,
465 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
466 if (!rc) {
467 tmpbuffer = kmalloc(maxpath);
468 rc = CIFSSMBQueryReparseLinkInfo(xid, ptcon, full_path,
469 tmpbuffer,
470 maxpath -1,
471 fid,
472 cifs_sb->local_nls);
473 if (CIFSSMBClose(xid, ptcon, fid)) {
474 cFYI(1, ("Error closing temporary reparsepoint open)"));
475 }
476 }
477 }
478 */
479
480 static int initiate_cifs_search(const int xid, struct file *file)
481 {
482 int rc = 0;
483 char *full_path;
484 struct cifsFileInfo *cifsFile;
485 struct cifs_sb_info *cifs_sb;
486 struct cifsTconInfo *pTcon;
487
488 if (file->private_data == NULL) {
489 file->private_data =
490 kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
491 }
492
493 if (file->private_data == NULL)
494 return -ENOMEM;
495 cifsFile = file->private_data;
496 cifsFile->invalidHandle = true;
497 cifsFile->srch_inf.endOfSearch = false;
498
499 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
500 if (cifs_sb == NULL)
501 return -EINVAL;
502
503 pTcon = cifs_sb->tcon;
504 if (pTcon == NULL)
505 return -EINVAL;
506
507 full_path = build_path_from_dentry(file->f_path.dentry);
508
509 if (full_path == NULL)
510 return -ENOMEM;
511
512 cFYI(1, ("Full path: %s start at: %lld", full_path, file->f_pos));
513
514 ffirst_retry:
515 /* test for Unix extensions */
516 /* but now check for them on the share/mount not on the SMB session */
517 /* if (pTcon->ses->capabilities & CAP_UNIX) { */
518 if (pTcon->unix_ext)
519 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
520 else if ((pTcon->ses->capabilities &
521 (CAP_NT_SMBS | CAP_NT_FIND)) == 0) {
522 cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD;
523 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
524 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
525 } else /* not srvinos - BB fixme add check for backlevel? */ {
526 cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
527 }
528
529 rc = CIFSFindFirst(xid, pTcon, full_path, cifs_sb->local_nls,
530 &cifsFile->netfid, &cifsFile->srch_inf,
531 cifs_sb->mnt_cifs_flags &
532 CIFS_MOUNT_MAP_SPECIAL_CHR, CIFS_DIR_SEP(cifs_sb));
533 if (rc == 0)
534 cifsFile->invalidHandle = false;
535 /* BB add following call to handle readdir on new NTFS symlink errors
536 else if STATUS_STOPPED_ON_SYMLINK
537 call get_symlink_reparse_path and retry with new path */
538 else if ((rc == -EOPNOTSUPP) &&
539 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
540 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
541 goto ffirst_retry;
542 }
543 kfree(full_path);
544 return rc;
545 }
546
547 /* return length of unicode string in bytes */
548 static int cifs_unicode_bytelen(char *str)
549 {
550 int len;
551 __le16 *ustr = (__le16 *)str;
552
553 for (len = 0; len <= PATH_MAX; len++) {
554 if (ustr[len] == 0)
555 return len << 1;
556 }
557 cFYI(1, ("Unicode string longer than PATH_MAX found"));
558 return len << 1;
559 }
560
561 static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level)
562 {
563 char *new_entry;
564 FILE_DIRECTORY_INFO *pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
565
566 if (level == SMB_FIND_FILE_INFO_STANDARD) {
567 FIND_FILE_STANDARD_INFO *pfData;
568 pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo;
569
570 new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) +
571 pfData->FileNameLength;
572 } else
573 new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
574 cFYI(1, ("new entry %p old entry %p", new_entry, old_entry));
575 /* validate that new_entry is not past end of SMB */
576 if (new_entry >= end_of_smb) {
577 cERROR(1,
578 ("search entry %p began after end of SMB %p old entry %p",
579 new_entry, end_of_smb, old_entry));
580 return NULL;
581 } else if (((level == SMB_FIND_FILE_INFO_STANDARD) &&
582 (new_entry + sizeof(FIND_FILE_STANDARD_INFO) > end_of_smb))
583 || ((level != SMB_FIND_FILE_INFO_STANDARD) &&
584 (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb))) {
585 cERROR(1, ("search entry %p extends after end of SMB %p",
586 new_entry, end_of_smb));
587 return NULL;
588 } else
589 return new_entry;
590
591 }
592
593 #define UNICODE_DOT cpu_to_le16(0x2e)
594
595 /* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
596 static int cifs_entry_is_dot(char *current_entry, struct cifsFileInfo *cfile)
597 {
598 int rc = 0;
599 char *filename = NULL;
600 int len = 0;
601
602 if (cfile->srch_inf.info_level == SMB_FIND_FILE_UNIX) {
603 FILE_UNIX_INFO *pFindData = (FILE_UNIX_INFO *)current_entry;
604 filename = &pFindData->FileName[0];
605 if (cfile->srch_inf.unicode) {
606 len = cifs_unicode_bytelen(filename);
607 } else {
608 /* BB should we make this strnlen of PATH_MAX? */
609 len = strnlen(filename, 5);
610 }
611 } else if (cfile->srch_inf.info_level == SMB_FIND_FILE_DIRECTORY_INFO) {
612 FILE_DIRECTORY_INFO *pFindData =
613 (FILE_DIRECTORY_INFO *)current_entry;
614 filename = &pFindData->FileName[0];
615 len = le32_to_cpu(pFindData->FileNameLength);
616 } else if (cfile->srch_inf.info_level ==
617 SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
618 FILE_FULL_DIRECTORY_INFO *pFindData =
619 (FILE_FULL_DIRECTORY_INFO *)current_entry;
620 filename = &pFindData->FileName[0];
621 len = le32_to_cpu(pFindData->FileNameLength);
622 } else if (cfile->srch_inf.info_level ==
623 SMB_FIND_FILE_ID_FULL_DIR_INFO) {
624 SEARCH_ID_FULL_DIR_INFO *pFindData =
625 (SEARCH_ID_FULL_DIR_INFO *)current_entry;
626 filename = &pFindData->FileName[0];
627 len = le32_to_cpu(pFindData->FileNameLength);
628 } else if (cfile->srch_inf.info_level ==
629 SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
630 FILE_BOTH_DIRECTORY_INFO *pFindData =
631 (FILE_BOTH_DIRECTORY_INFO *)current_entry;
632 filename = &pFindData->FileName[0];
633 len = le32_to_cpu(pFindData->FileNameLength);
634 } else if (cfile->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD) {
635 FIND_FILE_STANDARD_INFO *pFindData =
636 (FIND_FILE_STANDARD_INFO *)current_entry;
637 filename = &pFindData->FileName[0];
638 len = pFindData->FileNameLength;
639 } else {
640 cFYI(1, ("Unknown findfirst level %d",
641 cfile->srch_inf.info_level));
642 }
643
644 if (filename) {
645 if (cfile->srch_inf.unicode) {
646 __le16 *ufilename = (__le16 *)filename;
647 if (len == 2) {
648 /* check for . */
649 if (ufilename[0] == UNICODE_DOT)
650 rc = 1;
651 } else if (len == 4) {
652 /* check for .. */
653 if ((ufilename[0] == UNICODE_DOT)
654 && (ufilename[1] == UNICODE_DOT))
655 rc = 2;
656 }
657 } else /* ASCII */ {
658 if (len == 1) {
659 if (filename[0] == '.')
660 rc = 1;
661 } else if (len == 2) {
662 if ((filename[0] == '.') && (filename[1] == '.'))
663 rc = 2;
664 }
665 }
666 }
667
668 return rc;
669 }
670
671 /* Check if directory that we are searching has changed so we can decide
672 whether we can use the cached search results from the previous search */
673 static int is_dir_changed(struct file *file)
674 {
675 struct inode *inode = file->f_path.dentry->d_inode;
676 struct cifsInodeInfo *cifsInfo = CIFS_I(inode);
677
678 if (cifsInfo->time == 0)
679 return 1; /* directory was changed, perhaps due to unlink */
680 else
681 return 0;
682
683 }
684
685 static int cifs_save_resume_key(const char *current_entry,
686 struct cifsFileInfo *cifsFile)
687 {
688 int rc = 0;
689 unsigned int len = 0;
690 __u16 level;
691 char *filename;
692
693 if ((cifsFile == NULL) || (current_entry == NULL))
694 return -EINVAL;
695
696 level = cifsFile->srch_inf.info_level;
697
698 if (level == SMB_FIND_FILE_UNIX) {
699 FILE_UNIX_INFO *pFindData = (FILE_UNIX_INFO *)current_entry;
700
701 filename = &pFindData->FileName[0];
702 if (cifsFile->srch_inf.unicode) {
703 len = cifs_unicode_bytelen(filename);
704 } else {
705 /* BB should we make this strnlen of PATH_MAX? */
706 len = strnlen(filename, PATH_MAX);
707 }
708 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
709 } else if (level == SMB_FIND_FILE_DIRECTORY_INFO) {
710 FILE_DIRECTORY_INFO *pFindData =
711 (FILE_DIRECTORY_INFO *)current_entry;
712 filename = &pFindData->FileName[0];
713 len = le32_to_cpu(pFindData->FileNameLength);
714 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
715 } else if (level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
716 FILE_FULL_DIRECTORY_INFO *pFindData =
717 (FILE_FULL_DIRECTORY_INFO *)current_entry;
718 filename = &pFindData->FileName[0];
719 len = le32_to_cpu(pFindData->FileNameLength);
720 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
721 } else if (level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
722 SEARCH_ID_FULL_DIR_INFO *pFindData =
723 (SEARCH_ID_FULL_DIR_INFO *)current_entry;
724 filename = &pFindData->FileName[0];
725 len = le32_to_cpu(pFindData->FileNameLength);
726 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
727 } else if (level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
728 FILE_BOTH_DIRECTORY_INFO *pFindData =
729 (FILE_BOTH_DIRECTORY_INFO *)current_entry;
730 filename = &pFindData->FileName[0];
731 len = le32_to_cpu(pFindData->FileNameLength);
732 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
733 } else if (level == SMB_FIND_FILE_INFO_STANDARD) {
734 FIND_FILE_STANDARD_INFO *pFindData =
735 (FIND_FILE_STANDARD_INFO *)current_entry;
736 filename = &pFindData->FileName[0];
737 /* one byte length, no name conversion */
738 len = (unsigned int)pFindData->FileNameLength;
739 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
740 } else {
741 cFYI(1, ("Unknown findfirst level %d", level));
742 return -EINVAL;
743 }
744 cifsFile->srch_inf.resume_name_len = len;
745 cifsFile->srch_inf.presume_name = filename;
746 return rc;
747 }
748
749 /* find the corresponding entry in the search */
750 /* Note that the SMB server returns search entries for . and .. which
751 complicates logic here if we choose to parse for them and we do not
752 assume that they are located in the findfirst return buffer.*/
753 /* We start counting in the buffer with entry 2 and increment for every
754 entry (do not increment for . or .. entry) */
755 static int find_cifs_entry(const int xid, struct cifsTconInfo *pTcon,
756 struct file *file, char **ppCurrentEntry, int *num_to_ret)
757 {
758 int rc = 0;
759 int pos_in_buf = 0;
760 loff_t first_entry_in_buffer;
761 loff_t index_to_find = file->f_pos;
762 struct cifsFileInfo *cifsFile = file->private_data;
763 /* check if index in the buffer */
764
765 if ((cifsFile == NULL) || (ppCurrentEntry == NULL) ||
766 (num_to_ret == NULL))
767 return -ENOENT;
768
769 *ppCurrentEntry = NULL;
770 first_entry_in_buffer =
771 cifsFile->srch_inf.index_of_last_entry -
772 cifsFile->srch_inf.entries_in_buffer;
773
774 /* if first entry in buf is zero then is first buffer
775 in search response data which means it is likely . and ..
776 will be in this buffer, although some servers do not return
777 . and .. for the root of a drive and for those we need
778 to start two entries earlier */
779
780 dump_cifs_file_struct(file, "In fce ");
781 if (((index_to_find < cifsFile->srch_inf.index_of_last_entry) &&
782 is_dir_changed(file)) ||
783 (index_to_find < first_entry_in_buffer)) {
784 /* close and restart search */
785 cFYI(1, ("search backing up - close and restart search"));
786 write_lock(&GlobalSMBSeslock);
787 if (!cifsFile->srch_inf.endOfSearch &&
788 !cifsFile->invalidHandle) {
789 cifsFile->invalidHandle = true;
790 write_unlock(&GlobalSMBSeslock);
791 CIFSFindClose(xid, pTcon, cifsFile->netfid);
792 } else
793 write_unlock(&GlobalSMBSeslock);
794 if (cifsFile->srch_inf.ntwrk_buf_start) {
795 cFYI(1, ("freeing SMB ff cache buf on search rewind"));
796 if (cifsFile->srch_inf.smallBuf)
797 cifs_small_buf_release(cifsFile->srch_inf.
798 ntwrk_buf_start);
799 else
800 cifs_buf_release(cifsFile->srch_inf.
801 ntwrk_buf_start);
802 cifsFile->srch_inf.ntwrk_buf_start = NULL;
803 }
804 rc = initiate_cifs_search(xid, file);
805 if (rc) {
806 cFYI(1, ("error %d reinitiating a search on rewind",
807 rc));
808 return rc;
809 }
810 cifs_save_resume_key(cifsFile->srch_inf.last_entry, cifsFile);
811 }
812
813 while ((index_to_find >= cifsFile->srch_inf.index_of_last_entry) &&
814 (rc == 0) && !cifsFile->srch_inf.endOfSearch) {
815 cFYI(1, ("calling findnext2"));
816 rc = CIFSFindNext(xid, pTcon, cifsFile->netfid,
817 &cifsFile->srch_inf);
818 cifs_save_resume_key(cifsFile->srch_inf.last_entry, cifsFile);
819 if (rc)
820 return -ENOENT;
821 }
822 if (index_to_find < cifsFile->srch_inf.index_of_last_entry) {
823 /* we found the buffer that contains the entry */
824 /* scan and find it */
825 int i;
826 char *current_entry;
827 char *end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
828 smbCalcSize((struct smb_hdr *)
829 cifsFile->srch_inf.ntwrk_buf_start);
830
831 current_entry = cifsFile->srch_inf.srch_entries_start;
832 first_entry_in_buffer = cifsFile->srch_inf.index_of_last_entry
833 - cifsFile->srch_inf.entries_in_buffer;
834 pos_in_buf = index_to_find - first_entry_in_buffer;
835 cFYI(1, ("found entry - pos_in_buf %d", pos_in_buf));
836
837 for (i = 0; (i < (pos_in_buf)) && (current_entry != NULL); i++) {
838 /* go entry by entry figuring out which is first */
839 current_entry = nxt_dir_entry(current_entry, end_of_smb,
840 cifsFile->srch_inf.info_level);
841 }
842 if ((current_entry == NULL) && (i < pos_in_buf)) {
843 /* BB fixme - check if we should flag this error */
844 cERROR(1, ("reached end of buf searching for pos in buf"
845 " %d index to find %lld rc %d",
846 pos_in_buf, index_to_find, rc));
847 }
848 rc = 0;
849 *ppCurrentEntry = current_entry;
850 } else {
851 cFYI(1, ("index not in buffer - could not findnext into it"));
852 return 0;
853 }
854
855 if (pos_in_buf >= cifsFile->srch_inf.entries_in_buffer) {
856 cFYI(1, ("can not return entries pos_in_buf beyond last"));
857 *num_to_ret = 0;
858 } else
859 *num_to_ret = cifsFile->srch_inf.entries_in_buffer - pos_in_buf;
860
861 return rc;
862 }
863
864 /* inode num, inode type and filename returned */
865 static int cifs_get_name_from_search_buf(struct qstr *pqst,
866 char *current_entry, __u16 level, unsigned int unicode,
867 struct cifs_sb_info *cifs_sb, unsigned int max_len, __u64 *pinum)
868 {
869 int rc = 0;
870 unsigned int len = 0;
871 char *filename;
872 struct nls_table *nlt = cifs_sb->local_nls;
873
874 *pinum = 0;
875
876 if (level == SMB_FIND_FILE_UNIX) {
877 FILE_UNIX_INFO *pFindData = (FILE_UNIX_INFO *)current_entry;
878
879 filename = &pFindData->FileName[0];
880 if (unicode) {
881 len = cifs_unicode_bytelen(filename);
882 } else {
883 /* BB should we make this strnlen of PATH_MAX? */
884 len = strnlen(filename, PATH_MAX);
885 }
886
887 *pinum = le64_to_cpu(pFindData->UniqueId);
888 } else if (level == SMB_FIND_FILE_DIRECTORY_INFO) {
889 FILE_DIRECTORY_INFO *pFindData =
890 (FILE_DIRECTORY_INFO *)current_entry;
891 filename = &pFindData->FileName[0];
892 len = le32_to_cpu(pFindData->FileNameLength);
893 } else if (level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
894 FILE_FULL_DIRECTORY_INFO *pFindData =
895 (FILE_FULL_DIRECTORY_INFO *)current_entry;
896 filename = &pFindData->FileName[0];
897 len = le32_to_cpu(pFindData->FileNameLength);
898 } else if (level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
899 SEARCH_ID_FULL_DIR_INFO *pFindData =
900 (SEARCH_ID_FULL_DIR_INFO *)current_entry;
901 filename = &pFindData->FileName[0];
902 len = le32_to_cpu(pFindData->FileNameLength);
903 *pinum = le64_to_cpu(pFindData->UniqueId);
904 } else if (level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
905 FILE_BOTH_DIRECTORY_INFO *pFindData =
906 (FILE_BOTH_DIRECTORY_INFO *)current_entry;
907 filename = &pFindData->FileName[0];
908 len = le32_to_cpu(pFindData->FileNameLength);
909 } else if (level == SMB_FIND_FILE_INFO_STANDARD) {
910 FIND_FILE_STANDARD_INFO *pFindData =
911 (FIND_FILE_STANDARD_INFO *)current_entry;
912 filename = &pFindData->FileName[0];
913 /* one byte length, no name conversion */
914 len = (unsigned int)pFindData->FileNameLength;
915 } else {
916 cFYI(1, ("Unknown findfirst level %d", level));
917 return -EINVAL;
918 }
919
920 if (len > max_len) {
921 cERROR(1, ("bad search response length %d past smb end", len));
922 return -EINVAL;
923 }
924
925 if (unicode) {
926 pqst->len = cifs_from_ucs2((char *) pqst->name,
927 (__le16 *) filename,
928 UNICODE_NAME_MAX,
929 min(len, max_len), nlt,
930 cifs_sb->mnt_cifs_flags &
931 CIFS_MOUNT_MAP_SPECIAL_CHR);
932 } else {
933 pqst->name = filename;
934 pqst->len = len;
935 }
936 pqst->hash = full_name_hash(pqst->name, pqst->len);
937 /* cFYI(1, ("filldir on %s",pqst->name)); */
938 return rc;
939 }
940
941 static int cifs_filldir(char *pfindEntry, struct file *file, filldir_t filldir,
942 void *direntry, char *scratch_buf, unsigned int max_len)
943 {
944 int rc = 0;
945 struct qstr qstring;
946 struct cifsFileInfo *pCifsF;
947 unsigned int obj_type;
948 __u64 inum;
949 struct cifs_sb_info *cifs_sb;
950 struct inode *tmp_inode;
951 struct dentry *tmp_dentry;
952
953 /* get filename and len into qstring */
954 /* get dentry */
955 /* decide whether to create and populate ionde */
956 if ((direntry == NULL) || (file == NULL))
957 return -EINVAL;
958
959 pCifsF = file->private_data;
960
961 if ((scratch_buf == NULL) || (pfindEntry == NULL) || (pCifsF == NULL))
962 return -ENOENT;
963
964 rc = cifs_entry_is_dot(pfindEntry, pCifsF);
965 /* skip . and .. since we added them first */
966 if (rc != 0)
967 return 0;
968
969 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
970
971 qstring.name = scratch_buf;
972 rc = cifs_get_name_from_search_buf(&qstring, pfindEntry,
973 pCifsF->srch_inf.info_level,
974 pCifsF->srch_inf.unicode, cifs_sb,
975 max_len,
976 &inum /* returned */);
977
978 if (rc)
979 return rc;
980
981 /* only these two infolevels return valid inode numbers */
982 if (pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX ||
983 pCifsF->srch_inf.info_level == SMB_FIND_FILE_ID_FULL_DIR_INFO)
984 rc = construct_dentry(&qstring, file, &tmp_inode, &tmp_dentry,
985 &inum);
986 else
987 rc = construct_dentry(&qstring, file, &tmp_inode, &tmp_dentry,
988 NULL);
989
990 if ((tmp_inode == NULL) || (tmp_dentry == NULL))
991 return -ENOMEM;
992
993 /* we pass in rc below, indicating whether it is a new inode,
994 so we can figure out whether to invalidate the inode cached
995 data if the file has changed */
996 if (pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX)
997 unix_fill_in_inode(tmp_inode,
998 (FILE_UNIX_INFO *)pfindEntry,
999 &obj_type, rc);
1000 else if (pCifsF->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD)
1001 fill_in_inode(tmp_inode, 0 /* old level 1 buffer type */,
1002 pfindEntry, &obj_type, rc);
1003 else
1004 fill_in_inode(tmp_inode, 1 /* NT */, pfindEntry, &obj_type, rc);
1005
1006 if (rc) /* new inode - needs to be tied to dentry */ {
1007 d_instantiate(tmp_dentry, tmp_inode);
1008 if (rc == 2)
1009 d_rehash(tmp_dentry);
1010 }
1011
1012
1013 rc = filldir(direntry, qstring.name, qstring.len, file->f_pos,
1014 tmp_inode->i_ino, obj_type);
1015 if (rc) {
1016 cFYI(1, ("filldir rc = %d", rc));
1017 /* we can not return filldir errors to the caller
1018 since they are "normal" when the stat blocksize
1019 is too small - we return remapped error instead */
1020 rc = -EOVERFLOW;
1021 }
1022
1023 dput(tmp_dentry);
1024 return rc;
1025 }
1026
1027
1028 int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
1029 {
1030 int rc = 0;
1031 int xid, i;
1032 struct cifs_sb_info *cifs_sb;
1033 struct cifsTconInfo *pTcon;
1034 struct cifsFileInfo *cifsFile = NULL;
1035 char *current_entry;
1036 int num_to_fill = 0;
1037 char *tmp_buf = NULL;
1038 char *end_of_smb;
1039 unsigned int max_len;
1040
1041 xid = GetXid();
1042
1043 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
1044 pTcon = cifs_sb->tcon;
1045 if (pTcon == NULL)
1046 return -EINVAL;
1047
1048 switch ((int) file->f_pos) {
1049 case 0:
1050 if (filldir(direntry, ".", 1, file->f_pos,
1051 file->f_path.dentry->d_inode->i_ino, DT_DIR) < 0) {
1052 cERROR(1, ("Filldir for current dir failed"));
1053 rc = -ENOMEM;
1054 break;
1055 }
1056 file->f_pos++;
1057 case 1:
1058 if (filldir(direntry, "..", 2, file->f_pos,
1059 file->f_path.dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) {
1060 cERROR(1, ("Filldir for parent dir failed"));
1061 rc = -ENOMEM;
1062 break;
1063 }
1064 file->f_pos++;
1065 default:
1066 /* 1) If search is active,
1067 is in current search buffer?
1068 if it before then restart search
1069 if after then keep searching till find it */
1070
1071 if (file->private_data == NULL) {
1072 rc = initiate_cifs_search(xid, file);
1073 cFYI(1, ("initiate cifs search rc %d", rc));
1074 if (rc) {
1075 FreeXid(xid);
1076 return rc;
1077 }
1078 }
1079 if (file->private_data == NULL) {
1080 rc = -EINVAL;
1081 FreeXid(xid);
1082 return rc;
1083 }
1084 cifsFile = file->private_data;
1085 if (cifsFile->srch_inf.endOfSearch) {
1086 if (cifsFile->srch_inf.emptyDir) {
1087 cFYI(1, ("End of search, empty dir"));
1088 rc = 0;
1089 break;
1090 }
1091 } /* else {
1092 cifsFile->invalidHandle = true;
1093 CIFSFindClose(xid, pTcon, cifsFile->netfid);
1094 } */
1095
1096 rc = find_cifs_entry(xid, pTcon, file,
1097 &current_entry, &num_to_fill);
1098 if (rc) {
1099 cFYI(1, ("fce error %d", rc));
1100 goto rddir2_exit;
1101 } else if (current_entry != NULL) {
1102 cFYI(1, ("entry %lld found", file->f_pos));
1103 } else {
1104 cFYI(1, ("could not find entry"));
1105 goto rddir2_exit;
1106 }
1107 cFYI(1, ("loop through %d times filling dir for net buf %p",
1108 num_to_fill, cifsFile->srch_inf.ntwrk_buf_start));
1109 max_len = smbCalcSize((struct smb_hdr *)
1110 cifsFile->srch_inf.ntwrk_buf_start);
1111 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len;
1112
1113 tmp_buf = kmalloc(UNICODE_NAME_MAX, GFP_KERNEL);
1114 for (i = 0; (i < num_to_fill) && (rc == 0); i++) {
1115 if (current_entry == NULL) {
1116 /* evaluate whether this case is an error */
1117 cERROR(1, ("past SMB end, num to fill %d i %d",
1118 num_to_fill, i));
1119 break;
1120 }
1121 /* if buggy server returns . and .. late do
1122 we want to check for that here? */
1123 rc = cifs_filldir(current_entry, file,
1124 filldir, direntry, tmp_buf, max_len);
1125 if (rc == -EOVERFLOW) {
1126 rc = 0;
1127 break;
1128 }
1129
1130 file->f_pos++;
1131 if (file->f_pos ==
1132 cifsFile->srch_inf.index_of_last_entry) {
1133 cFYI(1, ("last entry in buf at pos %lld %s",
1134 file->f_pos, tmp_buf));
1135 cifs_save_resume_key(current_entry, cifsFile);
1136 break;
1137 } else
1138 current_entry =
1139 nxt_dir_entry(current_entry, end_of_smb,
1140 cifsFile->srch_inf.info_level);
1141 }
1142 kfree(tmp_buf);
1143 break;
1144 } /* end switch */
1145
1146 rddir2_exit:
1147 FreeXid(xid);
1148 return rc;
1149 }
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