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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/slab.h>
26 #include <linux/stat.h>
27 #include "cifspdu.h"
28 #include "cifsglob.h"
29 #include "cifsproto.h"
30 #include "cifs_unicode.h"
31 #include "cifs_debug.h"
32 #include "cifs_fs_sb.h"
33 #include "cifsfs.h"
34
35 /*
36 * To be safe - for UCS to UTF-8 with strings loaded with the rare long
37 * characters alloc more to account for such multibyte target UTF-8
38 * characters.
39 */
40 #define UNICODE_NAME_MAX ((4 * NAME_MAX) + 2)
41
42 #ifdef CONFIG_CIFS_DEBUG2
43 static void dump_cifs_file_struct(struct file *file, char *label)
44 {
45 struct cifsFileInfo *cf;
46
47 if (file) {
48 cf = file->private_data;
49 if (cf == NULL) {
50 cFYI(1, "empty cifs private file data");
51 return;
52 }
53 if (cf->invalidHandle)
54 cFYI(1, "invalid handle");
55 if (cf->srch_inf.endOfSearch)
56 cFYI(1, "end of search");
57 if (cf->srch_inf.emptyDir)
58 cFYI(1, "empty dir");
59 }
60 }
61 #else
62 static inline void dump_cifs_file_struct(struct file *file, char *label)
63 {
64 }
65 #endif /* DEBUG2 */
66
67 /*
68 * Find the dentry that matches "name". If there isn't one, create one. If it's
69 * a negative dentry or the uniqueid changed, then drop it and recreate it.
70 */
71 static struct dentry *
72 cifs_readdir_lookup(struct dentry *parent, struct qstr *name,
73 struct cifs_fattr *fattr)
74 {
75 struct dentry *dentry, *alias;
76 struct inode *inode;
77 struct super_block *sb = parent->d_inode->i_sb;
78
79 cFYI(1, "For %s", name->name);
80
81 if (parent->d_op && parent->d_op->d_hash)
82 parent->d_op->d_hash(parent, parent->d_inode, name);
83 else
84 name->hash = full_name_hash(name->name, name->len);
85
86 dentry = d_lookup(parent, name);
87 if (dentry) {
88 /* FIXME: check for inode number changes? */
89 if (dentry->d_inode != NULL)
90 return dentry;
91 d_drop(dentry);
92 dput(dentry);
93 }
94
95 dentry = d_alloc(parent, name);
96 if (dentry == NULL)
97 return NULL;
98
99 inode = cifs_iget(sb, fattr);
100 if (!inode) {
101 dput(dentry);
102 return NULL;
103 }
104
105 alias = d_materialise_unique(dentry, inode);
106 if (alias != NULL) {
107 dput(dentry);
108 if (IS_ERR(alias))
109 return NULL;
110 dentry = alias;
111 }
112
113 return dentry;
114 }
115
116 static void
117 cifs_fill_common_info(struct cifs_fattr *fattr, struct cifs_sb_info *cifs_sb)
118 {
119 fattr->cf_uid = cifs_sb->mnt_uid;
120 fattr->cf_gid = cifs_sb->mnt_gid;
121
122 if (fattr->cf_cifsattrs & ATTR_DIRECTORY) {
123 fattr->cf_mode = S_IFDIR | cifs_sb->mnt_dir_mode;
124 fattr->cf_dtype = DT_DIR;
125 } else {
126 fattr->cf_mode = S_IFREG | cifs_sb->mnt_file_mode;
127 fattr->cf_dtype = DT_REG;
128 }
129
130 if (fattr->cf_cifsattrs & ATTR_READONLY)
131 fattr->cf_mode &= ~S_IWUGO;
132
133 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL &&
134 fattr->cf_cifsattrs & ATTR_SYSTEM) {
135 if (fattr->cf_eof == 0) {
136 fattr->cf_mode &= ~S_IFMT;
137 fattr->cf_mode |= S_IFIFO;
138 fattr->cf_dtype = DT_FIFO;
139 } else {
140 /*
141 * trying to get the type and mode via SFU can be slow,
142 * so just call those regular files for now, and mark
143 * for reval
144 */
145 fattr->cf_flags |= CIFS_FATTR_NEED_REVAL;
146 }
147 }
148 }
149
150 static void
151 cifs_dir_info_to_fattr(struct cifs_fattr *fattr, FILE_DIRECTORY_INFO *info,
152 struct cifs_sb_info *cifs_sb)
153 {
154 memset(fattr, 0, sizeof(*fattr));
155 fattr->cf_cifsattrs = le32_to_cpu(info->ExtFileAttributes);
156 fattr->cf_eof = le64_to_cpu(info->EndOfFile);
157 fattr->cf_bytes = le64_to_cpu(info->AllocationSize);
158 fattr->cf_createtime = le64_to_cpu(info->CreationTime);
159 fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
160 fattr->cf_ctime = cifs_NTtimeToUnix(info->ChangeTime);
161 fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime);
162
163 cifs_fill_common_info(fattr, cifs_sb);
164 }
165
166 static void
167 cifs_std_info_to_fattr(struct cifs_fattr *fattr, FIND_FILE_STANDARD_INFO *info,
168 struct cifs_sb_info *cifs_sb)
169 {
170 int offset = cifs_sb_master_tcon(cifs_sb)->ses->server->timeAdj;
171
172 memset(fattr, 0, sizeof(*fattr));
173 fattr->cf_atime = cnvrtDosUnixTm(info->LastAccessDate,
174 info->LastAccessTime, offset);
175 fattr->cf_ctime = cnvrtDosUnixTm(info->LastWriteDate,
176 info->LastWriteTime, offset);
177 fattr->cf_mtime = cnvrtDosUnixTm(info->LastWriteDate,
178 info->LastWriteTime, offset);
179
180 fattr->cf_cifsattrs = le16_to_cpu(info->Attributes);
181 fattr->cf_bytes = le32_to_cpu(info->AllocationSize);
182 fattr->cf_eof = le32_to_cpu(info->DataSize);
183
184 cifs_fill_common_info(fattr, cifs_sb);
185 }
186
187 /* BB eventually need to add the following helper function to
188 resolve NT_STATUS_STOPPED_ON_SYMLINK return code when
189 we try to do FindFirst on (NTFS) directory symlinks */
190 /*
191 int get_symlink_reparse_path(char *full_path, struct cifs_sb_info *cifs_sb,
192 int xid)
193 {
194 __u16 fid;
195 int len;
196 int oplock = 0;
197 int rc;
198 struct cifsTconInfo *ptcon = cifs_sb_tcon(cifs_sb);
199 char *tmpbuffer;
200
201 rc = CIFSSMBOpen(xid, ptcon, full_path, FILE_OPEN, GENERIC_READ,
202 OPEN_REPARSE_POINT, &fid, &oplock, NULL,
203 cifs_sb->local_nls,
204 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
205 if (!rc) {
206 tmpbuffer = kmalloc(maxpath);
207 rc = CIFSSMBQueryReparseLinkInfo(xid, ptcon, full_path,
208 tmpbuffer,
209 maxpath -1,
210 fid,
211 cifs_sb->local_nls);
212 if (CIFSSMBClose(xid, ptcon, fid)) {
213 cFYI(1, "Error closing temporary reparsepoint open");
214 }
215 }
216 }
217 */
218
219 static int initiate_cifs_search(const int xid, struct file *file)
220 {
221 int rc = 0;
222 char *full_path = NULL;
223 struct cifsFileInfo *cifsFile;
224 struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
225 struct tcon_link *tlink = NULL;
226 struct cifsTconInfo *pTcon;
227
228 if (file->private_data == NULL) {
229 tlink = cifs_sb_tlink(cifs_sb);
230 if (IS_ERR(tlink))
231 return PTR_ERR(tlink);
232
233 cifsFile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
234 if (cifsFile == NULL) {
235 rc = -ENOMEM;
236 goto error_exit;
237 }
238 file->private_data = cifsFile;
239 cifsFile->tlink = cifs_get_tlink(tlink);
240 pTcon = tlink_tcon(tlink);
241 } else {
242 cifsFile = file->private_data;
243 pTcon = tlink_tcon(cifsFile->tlink);
244 }
245
246 cifsFile->invalidHandle = true;
247 cifsFile->srch_inf.endOfSearch = false;
248
249 full_path = build_path_from_dentry(file->f_path.dentry);
250 if (full_path == NULL) {
251 rc = -ENOMEM;
252 goto error_exit;
253 }
254
255 cFYI(1, "Full path: %s start at: %lld", full_path, file->f_pos);
256
257 ffirst_retry:
258 /* test for Unix extensions */
259 /* but now check for them on the share/mount not on the SMB session */
260 /* if (pTcon->ses->capabilities & CAP_UNIX) { */
261 if (pTcon->unix_ext)
262 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
263 else if ((pTcon->ses->capabilities &
264 (CAP_NT_SMBS | CAP_NT_FIND)) == 0) {
265 cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD;
266 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
267 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
268 } else /* not srvinos - BB fixme add check for backlevel? */ {
269 cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
270 }
271
272 rc = CIFSFindFirst(xid, pTcon, full_path, cifs_sb->local_nls,
273 &cifsFile->netfid, &cifsFile->srch_inf,
274 cifs_sb->mnt_cifs_flags &
275 CIFS_MOUNT_MAP_SPECIAL_CHR, CIFS_DIR_SEP(cifs_sb));
276 if (rc == 0)
277 cifsFile->invalidHandle = false;
278 /* BB add following call to handle readdir on new NTFS symlink errors
279 else if STATUS_STOPPED_ON_SYMLINK
280 call get_symlink_reparse_path and retry with new path */
281 else if ((rc == -EOPNOTSUPP) &&
282 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
283 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
284 goto ffirst_retry;
285 }
286 error_exit:
287 kfree(full_path);
288 cifs_put_tlink(tlink);
289 return rc;
290 }
291
292 /* return length of unicode string in bytes */
293 static int cifs_unicode_bytelen(char *str)
294 {
295 int len;
296 __le16 *ustr = (__le16 *)str;
297
298 for (len = 0; len <= PATH_MAX; len++) {
299 if (ustr[len] == 0)
300 return len << 1;
301 }
302 cFYI(1, "Unicode string longer than PATH_MAX found");
303 return len << 1;
304 }
305
306 static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level)
307 {
308 char *new_entry;
309 FILE_DIRECTORY_INFO *pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
310
311 if (level == SMB_FIND_FILE_INFO_STANDARD) {
312 FIND_FILE_STANDARD_INFO *pfData;
313 pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo;
314
315 new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) +
316 pfData->FileNameLength;
317 } else
318 new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
319 cFYI(1, "new entry %p old entry %p", new_entry, old_entry);
320 /* validate that new_entry is not past end of SMB */
321 if (new_entry >= end_of_smb) {
322 cERROR(1, "search entry %p began after end of SMB %p old entry %p",
323 new_entry, end_of_smb, old_entry);
324 return NULL;
325 } else if (((level == SMB_FIND_FILE_INFO_STANDARD) &&
326 (new_entry + sizeof(FIND_FILE_STANDARD_INFO) > end_of_smb))
327 || ((level != SMB_FIND_FILE_INFO_STANDARD) &&
328 (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb))) {
329 cERROR(1, "search entry %p extends after end of SMB %p",
330 new_entry, end_of_smb);
331 return NULL;
332 } else
333 return new_entry;
334
335 }
336
337 #define UNICODE_DOT cpu_to_le16(0x2e)
338
339 /* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
340 static int cifs_entry_is_dot(char *current_entry, struct cifsFileInfo *cfile)
341 {
342 int rc = 0;
343 char *filename = NULL;
344 int len = 0;
345
346 if (cfile->srch_inf.info_level == SMB_FIND_FILE_UNIX) {
347 FILE_UNIX_INFO *pFindData = (FILE_UNIX_INFO *)current_entry;
348 filename = &pFindData->FileName[0];
349 if (cfile->srch_inf.unicode) {
350 len = cifs_unicode_bytelen(filename);
351 } else {
352 /* BB should we make this strnlen of PATH_MAX? */
353 len = strnlen(filename, 5);
354 }
355 } else if (cfile->srch_inf.info_level == SMB_FIND_FILE_DIRECTORY_INFO) {
356 FILE_DIRECTORY_INFO *pFindData =
357 (FILE_DIRECTORY_INFO *)current_entry;
358 filename = &pFindData->FileName[0];
359 len = le32_to_cpu(pFindData->FileNameLength);
360 } else if (cfile->srch_inf.info_level ==
361 SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
362 FILE_FULL_DIRECTORY_INFO *pFindData =
363 (FILE_FULL_DIRECTORY_INFO *)current_entry;
364 filename = &pFindData->FileName[0];
365 len = le32_to_cpu(pFindData->FileNameLength);
366 } else if (cfile->srch_inf.info_level ==
367 SMB_FIND_FILE_ID_FULL_DIR_INFO) {
368 SEARCH_ID_FULL_DIR_INFO *pFindData =
369 (SEARCH_ID_FULL_DIR_INFO *)current_entry;
370 filename = &pFindData->FileName[0];
371 len = le32_to_cpu(pFindData->FileNameLength);
372 } else if (cfile->srch_inf.info_level ==
373 SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
374 FILE_BOTH_DIRECTORY_INFO *pFindData =
375 (FILE_BOTH_DIRECTORY_INFO *)current_entry;
376 filename = &pFindData->FileName[0];
377 len = le32_to_cpu(pFindData->FileNameLength);
378 } else if (cfile->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD) {
379 FIND_FILE_STANDARD_INFO *pFindData =
380 (FIND_FILE_STANDARD_INFO *)current_entry;
381 filename = &pFindData->FileName[0];
382 len = pFindData->FileNameLength;
383 } else {
384 cFYI(1, "Unknown findfirst level %d",
385 cfile->srch_inf.info_level);
386 }
387
388 if (filename) {
389 if (cfile->srch_inf.unicode) {
390 __le16 *ufilename = (__le16 *)filename;
391 if (len == 2) {
392 /* check for . */
393 if (ufilename[0] == UNICODE_DOT)
394 rc = 1;
395 } else if (len == 4) {
396 /* check for .. */
397 if ((ufilename[0] == UNICODE_DOT)
398 && (ufilename[1] == UNICODE_DOT))
399 rc = 2;
400 }
401 } else /* ASCII */ {
402 if (len == 1) {
403 if (filename[0] == '.')
404 rc = 1;
405 } else if (len == 2) {
406 if ((filename[0] == '.') && (filename[1] == '.'))
407 rc = 2;
408 }
409 }
410 }
411
412 return rc;
413 }
414
415 /* Check if directory that we are searching has changed so we can decide
416 whether we can use the cached search results from the previous search */
417 static int is_dir_changed(struct file *file)
418 {
419 struct inode *inode = file->f_path.dentry->d_inode;
420 struct cifsInodeInfo *cifsInfo = CIFS_I(inode);
421
422 if (cifsInfo->time == 0)
423 return 1; /* directory was changed, perhaps due to unlink */
424 else
425 return 0;
426
427 }
428
429 static int cifs_save_resume_key(const char *current_entry,
430 struct cifsFileInfo *cifsFile)
431 {
432 int rc = 0;
433 unsigned int len = 0;
434 __u16 level;
435 char *filename;
436
437 if ((cifsFile == NULL) || (current_entry == NULL))
438 return -EINVAL;
439
440 level = cifsFile->srch_inf.info_level;
441
442 if (level == SMB_FIND_FILE_UNIX) {
443 FILE_UNIX_INFO *pFindData = (FILE_UNIX_INFO *)current_entry;
444
445 filename = &pFindData->FileName[0];
446 if (cifsFile->srch_inf.unicode) {
447 len = cifs_unicode_bytelen(filename);
448 } else {
449 /* BB should we make this strnlen of PATH_MAX? */
450 len = strnlen(filename, PATH_MAX);
451 }
452 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
453 } else if (level == SMB_FIND_FILE_DIRECTORY_INFO) {
454 FILE_DIRECTORY_INFO *pFindData =
455 (FILE_DIRECTORY_INFO *)current_entry;
456 filename = &pFindData->FileName[0];
457 len = le32_to_cpu(pFindData->FileNameLength);
458 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
459 } else if (level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
460 FILE_FULL_DIRECTORY_INFO *pFindData =
461 (FILE_FULL_DIRECTORY_INFO *)current_entry;
462 filename = &pFindData->FileName[0];
463 len = le32_to_cpu(pFindData->FileNameLength);
464 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
465 } else if (level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
466 SEARCH_ID_FULL_DIR_INFO *pFindData =
467 (SEARCH_ID_FULL_DIR_INFO *)current_entry;
468 filename = &pFindData->FileName[0];
469 len = le32_to_cpu(pFindData->FileNameLength);
470 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
471 } else if (level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
472 FILE_BOTH_DIRECTORY_INFO *pFindData =
473 (FILE_BOTH_DIRECTORY_INFO *)current_entry;
474 filename = &pFindData->FileName[0];
475 len = le32_to_cpu(pFindData->FileNameLength);
476 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
477 } else if (level == SMB_FIND_FILE_INFO_STANDARD) {
478 FIND_FILE_STANDARD_INFO *pFindData =
479 (FIND_FILE_STANDARD_INFO *)current_entry;
480 filename = &pFindData->FileName[0];
481 /* one byte length, no name conversion */
482 len = (unsigned int)pFindData->FileNameLength;
483 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
484 } else {
485 cFYI(1, "Unknown findfirst level %d", level);
486 return -EINVAL;
487 }
488 cifsFile->srch_inf.resume_name_len = len;
489 cifsFile->srch_inf.presume_name = filename;
490 return rc;
491 }
492
493 /* find the corresponding entry in the search */
494 /* Note that the SMB server returns search entries for . and .. which
495 complicates logic here if we choose to parse for them and we do not
496 assume that they are located in the findfirst return buffer.*/
497 /* We start counting in the buffer with entry 2 and increment for every
498 entry (do not increment for . or .. entry) */
499 static int find_cifs_entry(const int xid, struct cifsTconInfo *pTcon,
500 struct file *file, char **ppCurrentEntry, int *num_to_ret)
501 {
502 int rc = 0;
503 int pos_in_buf = 0;
504 loff_t first_entry_in_buffer;
505 loff_t index_to_find = file->f_pos;
506 struct cifsFileInfo *cifsFile = file->private_data;
507 /* check if index in the buffer */
508
509 if ((cifsFile == NULL) || (ppCurrentEntry == NULL) ||
510 (num_to_ret == NULL))
511 return -ENOENT;
512
513 *ppCurrentEntry = NULL;
514 first_entry_in_buffer =
515 cifsFile->srch_inf.index_of_last_entry -
516 cifsFile->srch_inf.entries_in_buffer;
517
518 /* if first entry in buf is zero then is first buffer
519 in search response data which means it is likely . and ..
520 will be in this buffer, although some servers do not return
521 . and .. for the root of a drive and for those we need
522 to start two entries earlier */
523
524 dump_cifs_file_struct(file, "In fce ");
525 if (((index_to_find < cifsFile->srch_inf.index_of_last_entry) &&
526 is_dir_changed(file)) ||
527 (index_to_find < first_entry_in_buffer)) {
528 /* close and restart search */
529 cFYI(1, "search backing up - close and restart search");
530 spin_lock(&cifs_file_list_lock);
531 if (!cifsFile->srch_inf.endOfSearch &&
532 !cifsFile->invalidHandle) {
533 cifsFile->invalidHandle = true;
534 spin_unlock(&cifs_file_list_lock);
535 CIFSFindClose(xid, pTcon, cifsFile->netfid);
536 } else
537 spin_unlock(&cifs_file_list_lock);
538 if (cifsFile->srch_inf.ntwrk_buf_start) {
539 cFYI(1, "freeing SMB ff cache buf on search rewind");
540 if (cifsFile->srch_inf.smallBuf)
541 cifs_small_buf_release(cifsFile->srch_inf.
542 ntwrk_buf_start);
543 else
544 cifs_buf_release(cifsFile->srch_inf.
545 ntwrk_buf_start);
546 cifsFile->srch_inf.ntwrk_buf_start = NULL;
547 }
548 rc = initiate_cifs_search(xid, file);
549 if (rc) {
550 cFYI(1, "error %d reinitiating a search on rewind",
551 rc);
552 return rc;
553 }
554 cifs_save_resume_key(cifsFile->srch_inf.last_entry, cifsFile);
555 }
556
557 while ((index_to_find >= cifsFile->srch_inf.index_of_last_entry) &&
558 (rc == 0) && !cifsFile->srch_inf.endOfSearch) {
559 cFYI(1, "calling findnext2");
560 rc = CIFSFindNext(xid, pTcon, cifsFile->netfid,
561 &cifsFile->srch_inf);
562 cifs_save_resume_key(cifsFile->srch_inf.last_entry, cifsFile);
563 if (rc)
564 return -ENOENT;
565 }
566 if (index_to_find < cifsFile->srch_inf.index_of_last_entry) {
567 /* we found the buffer that contains the entry */
568 /* scan and find it */
569 int i;
570 char *current_entry;
571 char *end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
572 smbCalcSize((struct smb_hdr *)
573 cifsFile->srch_inf.ntwrk_buf_start);
574
575 current_entry = cifsFile->srch_inf.srch_entries_start;
576 first_entry_in_buffer = cifsFile->srch_inf.index_of_last_entry
577 - cifsFile->srch_inf.entries_in_buffer;
578 pos_in_buf = index_to_find - first_entry_in_buffer;
579 cFYI(1, "found entry - pos_in_buf %d", pos_in_buf);
580
581 for (i = 0; (i < (pos_in_buf)) && (current_entry != NULL); i++) {
582 /* go entry by entry figuring out which is first */
583 current_entry = nxt_dir_entry(current_entry, end_of_smb,
584 cifsFile->srch_inf.info_level);
585 }
586 if ((current_entry == NULL) && (i < pos_in_buf)) {
587 /* BB fixme - check if we should flag this error */
588 cERROR(1, "reached end of buf searching for pos in buf"
589 " %d index to find %lld rc %d",
590 pos_in_buf, index_to_find, rc);
591 }
592 rc = 0;
593 *ppCurrentEntry = current_entry;
594 } else {
595 cFYI(1, "index not in buffer - could not findnext into it");
596 return 0;
597 }
598
599 if (pos_in_buf >= cifsFile->srch_inf.entries_in_buffer) {
600 cFYI(1, "can not return entries pos_in_buf beyond last");
601 *num_to_ret = 0;
602 } else
603 *num_to_ret = cifsFile->srch_inf.entries_in_buffer - pos_in_buf;
604
605 return rc;
606 }
607
608 /* inode num, inode type and filename returned */
609 static int cifs_get_name_from_search_buf(struct qstr *pqst,
610 char *current_entry, __u16 level, unsigned int unicode,
611 struct cifs_sb_info *cifs_sb, unsigned int max_len, __u64 *pinum)
612 {
613 int rc = 0;
614 unsigned int len = 0;
615 char *filename;
616 struct nls_table *nlt = cifs_sb->local_nls;
617
618 *pinum = 0;
619
620 if (level == SMB_FIND_FILE_UNIX) {
621 FILE_UNIX_INFO *pFindData = (FILE_UNIX_INFO *)current_entry;
622
623 filename = &pFindData->FileName[0];
624 if (unicode) {
625 len = cifs_unicode_bytelen(filename);
626 } else {
627 /* BB should we make this strnlen of PATH_MAX? */
628 len = strnlen(filename, PATH_MAX);
629 }
630
631 *pinum = le64_to_cpu(pFindData->basic.UniqueId);
632 } else if (level == SMB_FIND_FILE_DIRECTORY_INFO) {
633 FILE_DIRECTORY_INFO *pFindData =
634 (FILE_DIRECTORY_INFO *)current_entry;
635 filename = &pFindData->FileName[0];
636 len = le32_to_cpu(pFindData->FileNameLength);
637 } else if (level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
638 FILE_FULL_DIRECTORY_INFO *pFindData =
639 (FILE_FULL_DIRECTORY_INFO *)current_entry;
640 filename = &pFindData->FileName[0];
641 len = le32_to_cpu(pFindData->FileNameLength);
642 } else if (level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
643 SEARCH_ID_FULL_DIR_INFO *pFindData =
644 (SEARCH_ID_FULL_DIR_INFO *)current_entry;
645 filename = &pFindData->FileName[0];
646 len = le32_to_cpu(pFindData->FileNameLength);
647 *pinum = le64_to_cpu(pFindData->UniqueId);
648 } else if (level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
649 FILE_BOTH_DIRECTORY_INFO *pFindData =
650 (FILE_BOTH_DIRECTORY_INFO *)current_entry;
651 filename = &pFindData->FileName[0];
652 len = le32_to_cpu(pFindData->FileNameLength);
653 } else if (level == SMB_FIND_FILE_INFO_STANDARD) {
654 FIND_FILE_STANDARD_INFO *pFindData =
655 (FIND_FILE_STANDARD_INFO *)current_entry;
656 filename = &pFindData->FileName[0];
657 /* one byte length, no name conversion */
658 len = (unsigned int)pFindData->FileNameLength;
659 } else {
660 cFYI(1, "Unknown findfirst level %d", level);
661 return -EINVAL;
662 }
663
664 if (len > max_len) {
665 cERROR(1, "bad search response length %d past smb end", len);
666 return -EINVAL;
667 }
668
669 if (unicode) {
670 pqst->len = cifs_from_ucs2((char *) pqst->name,
671 (__le16 *) filename,
672 UNICODE_NAME_MAX,
673 min(len, max_len), nlt,
674 cifs_sb->mnt_cifs_flags &
675 CIFS_MOUNT_MAP_SPECIAL_CHR);
676 pqst->len -= nls_nullsize(nlt);
677 } else {
678 pqst->name = filename;
679 pqst->len = len;
680 }
681 return rc;
682 }
683
684 static int cifs_filldir(char *pfindEntry, struct file *file, filldir_t filldir,
685 void *direntry, char *scratch_buf, unsigned int max_len)
686 {
687 int rc = 0;
688 struct qstr qstring;
689 struct cifsFileInfo *pCifsF;
690 u64 inum;
691 ino_t ino;
692 struct super_block *sb;
693 struct cifs_sb_info *cifs_sb;
694 struct dentry *tmp_dentry;
695 struct cifs_fattr fattr;
696
697 /* get filename and len into qstring */
698 /* get dentry */
699 /* decide whether to create and populate ionde */
700 if ((direntry == NULL) || (file == NULL))
701 return -EINVAL;
702
703 pCifsF = file->private_data;
704
705 if ((scratch_buf == NULL) || (pfindEntry == NULL) || (pCifsF == NULL))
706 return -ENOENT;
707
708 rc = cifs_entry_is_dot(pfindEntry, pCifsF);
709 /* skip . and .. since we added them first */
710 if (rc != 0)
711 return 0;
712
713 sb = file->f_path.dentry->d_sb;
714 cifs_sb = CIFS_SB(sb);
715
716 qstring.name = scratch_buf;
717 rc = cifs_get_name_from_search_buf(&qstring, pfindEntry,
718 pCifsF->srch_inf.info_level,
719 pCifsF->srch_inf.unicode, cifs_sb,
720 max_len, &inum /* returned */);
721
722 if (rc)
723 return rc;
724
725 if (pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX)
726 cifs_unix_basic_to_fattr(&fattr,
727 &((FILE_UNIX_INFO *) pfindEntry)->basic,
728 cifs_sb);
729 else if (pCifsF->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD)
730 cifs_std_info_to_fattr(&fattr, (FIND_FILE_STANDARD_INFO *)
731 pfindEntry, cifs_sb);
732 else
733 cifs_dir_info_to_fattr(&fattr, (FILE_DIRECTORY_INFO *)
734 pfindEntry, cifs_sb);
735
736 if (inum && (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
737 fattr.cf_uniqueid = inum;
738 } else {
739 fattr.cf_uniqueid = iunique(sb, ROOT_I);
740 cifs_autodisable_serverino(cifs_sb);
741 }
742
743 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) &&
744 CIFSCouldBeMFSymlink(&fattr))
745 /*
746 * trying to get the type and mode can be slow,
747 * so just call those regular files for now, and mark
748 * for reval
749 */
750 fattr.cf_flags |= CIFS_FATTR_NEED_REVAL;
751
752 ino = cifs_uniqueid_to_ino_t(fattr.cf_uniqueid);
753 tmp_dentry = cifs_readdir_lookup(file->f_dentry, &qstring, &fattr);
754
755 rc = filldir(direntry, qstring.name, qstring.len, file->f_pos,
756 ino, fattr.cf_dtype);
757
758 dput(tmp_dentry);
759 return rc;
760 }
761
762
763 int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
764 {
765 int rc = 0;
766 int xid, i;
767 struct cifsTconInfo *pTcon;
768 struct cifsFileInfo *cifsFile = NULL;
769 char *current_entry;
770 int num_to_fill = 0;
771 char *tmp_buf = NULL;
772 char *end_of_smb;
773 unsigned int max_len;
774
775 xid = GetXid();
776
777 /*
778 * Ensure FindFirst doesn't fail before doing filldir() for '.' and
779 * '..'. Otherwise we won't be able to notify VFS in case of failure.
780 */
781 if (file->private_data == NULL) {
782 rc = initiate_cifs_search(xid, file);
783 cFYI(1, "initiate cifs search rc %d", rc);
784 if (rc)
785 goto rddir2_exit;
786 }
787
788 switch ((int) file->f_pos) {
789 case 0:
790 if (filldir(direntry, ".", 1, file->f_pos,
791 file->f_path.dentry->d_inode->i_ino, DT_DIR) < 0) {
792 cERROR(1, "Filldir for current dir failed");
793 rc = -ENOMEM;
794 break;
795 }
796 file->f_pos++;
797 case 1:
798 if (filldir(direntry, "..", 2, file->f_pos,
799 file->f_path.dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) {
800 cERROR(1, "Filldir for parent dir failed");
801 rc = -ENOMEM;
802 break;
803 }
804 file->f_pos++;
805 default:
806 /* 1) If search is active,
807 is in current search buffer?
808 if it before then restart search
809 if after then keep searching till find it */
810
811 if (file->private_data == NULL) {
812 rc = -EINVAL;
813 FreeXid(xid);
814 return rc;
815 }
816 cifsFile = file->private_data;
817 if (cifsFile->srch_inf.endOfSearch) {
818 if (cifsFile->srch_inf.emptyDir) {
819 cFYI(1, "End of search, empty dir");
820 rc = 0;
821 break;
822 }
823 } /* else {
824 cifsFile->invalidHandle = true;
825 CIFSFindClose(xid, pTcon, cifsFile->netfid);
826 } */
827
828 pTcon = tlink_tcon(cifsFile->tlink);
829 rc = find_cifs_entry(xid, pTcon, file,
830 &current_entry, &num_to_fill);
831 if (rc) {
832 cFYI(1, "fce error %d", rc);
833 goto rddir2_exit;
834 } else if (current_entry != NULL) {
835 cFYI(1, "entry %lld found", file->f_pos);
836 } else {
837 cFYI(1, "could not find entry");
838 goto rddir2_exit;
839 }
840 cFYI(1, "loop through %d times filling dir for net buf %p",
841 num_to_fill, cifsFile->srch_inf.ntwrk_buf_start);
842 max_len = smbCalcSize((struct smb_hdr *)
843 cifsFile->srch_inf.ntwrk_buf_start);
844 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len;
845
846 tmp_buf = kmalloc(UNICODE_NAME_MAX, GFP_KERNEL);
847 if (tmp_buf == NULL) {
848 rc = -ENOMEM;
849 break;
850 }
851
852 for (i = 0; (i < num_to_fill) && (rc == 0); i++) {
853 if (current_entry == NULL) {
854 /* evaluate whether this case is an error */
855 cERROR(1, "past SMB end, num to fill %d i %d",
856 num_to_fill, i);
857 break;
858 }
859 /* if buggy server returns . and .. late do
860 we want to check for that here? */
861 rc = cifs_filldir(current_entry, file,
862 filldir, direntry, tmp_buf, max_len);
863 if (rc == -EOVERFLOW) {
864 rc = 0;
865 break;
866 }
867
868 file->f_pos++;
869 if (file->f_pos ==
870 cifsFile->srch_inf.index_of_last_entry) {
871 cFYI(1, "last entry in buf at pos %lld %s",
872 file->f_pos, tmp_buf);
873 cifs_save_resume_key(current_entry, cifsFile);
874 break;
875 } else
876 current_entry =
877 nxt_dir_entry(current_entry, end_of_smb,
878 cifsFile->srch_inf.info_level);
879 }
880 kfree(tmp_buf);
881 break;
882 } /* end switch */
883
884 rddir2_exit:
885 FreeXid(xid);
886 return rc;
887 }