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Merge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linux
[linux-2.6/kvm.git] / fs / cifs / readdir.c
blob5de03ec20144449c2dea66441b1e66cc577f4a48
1 /*
2 * fs/cifs/readdir.c
3 *
4 * Directory search handling
5 *
6 * Copyright (C) International Business Machines Corp., 2004, 2008
7 * Copyright (C) Red Hat, Inc., 2011
8 * Author(s): Steve French (sfrench@us.ibm.com)
9 *
10 * This library is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU Lesser General Public License as published
12 * by the Free Software Foundation; either version 2.1 of the License, or
13 * (at your option) any later version.
14 *
15 * This library is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
18 * the GNU Lesser General Public License for more details.
19 *
20 * You should have received a copy of the GNU Lesser General Public License
21 * along with this library; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 */
24 #include <linux/fs.h>
25 #include <linux/pagemap.h>
26 #include <linux/slab.h>
27 #include <linux/stat.h>
28 #include "cifspdu.h"
29 #include "cifsglob.h"
30 #include "cifsproto.h"
31 #include "cifs_unicode.h"
32 #include "cifs_debug.h"
33 #include "cifs_fs_sb.h"
34 #include "cifsfs.h"
35
36 /*
37 * To be safe - for UCS to UTF-8 with strings loaded with the rare long
38 * characters alloc more to account for such multibyte target UTF-8
39 * characters.
40 */
41 #define UNICODE_NAME_MAX ((4 * NAME_MAX) + 2)
42
43 #ifdef CONFIG_CIFS_DEBUG2
44 static void dump_cifs_file_struct(struct file *file, char *label)
45 {
46 struct cifsFileInfo *cf;
47
48 if (file) {
49 cf = file->private_data;
50 if (cf == NULL) {
51 cFYI(1, "empty cifs private file data");
52 return;
53 }
54 if (cf->invalidHandle)
55 cFYI(1, "invalid handle");
56 if (cf->srch_inf.endOfSearch)
57 cFYI(1, "end of search");
58 if (cf->srch_inf.emptyDir)
59 cFYI(1, "empty dir");
60 }
61 }
62 #else
63 static inline void dump_cifs_file_struct(struct file *file, char *label)
64 {
65 }
66 #endif /* DEBUG2 */
67
68 /*
69 * Find the dentry that matches "name". If there isn't one, create one. If it's
70 * a negative dentry or the uniqueid changed, then drop it and recreate it.
71 */
72 static struct dentry *
73 cifs_readdir_lookup(struct dentry *parent, struct qstr *name,
74 struct cifs_fattr *fattr)
75 {
76 struct dentry *dentry, *alias;
77 struct inode *inode;
78 struct super_block *sb = parent->d_inode->i_sb;
79
80 cFYI(1, "For %s", name->name);
81
82 if (parent->d_op && parent->d_op->d_hash)
83 parent->d_op->d_hash(parent, parent->d_inode, name);
84 else
85 name->hash = full_name_hash(name->name, name->len);
86
87 dentry = d_lookup(parent, name);
88 if (dentry) {
89 /* FIXME: check for inode number changes? */
90 if (dentry->d_inode != NULL)
91 return dentry;
92 d_drop(dentry);
93 dput(dentry);
94 }
95
96 dentry = d_alloc(parent, name);
97 if (dentry == NULL)
98 return NULL;
99
100 inode = cifs_iget(sb, fattr);
101 if (!inode) {
102 dput(dentry);
103 return NULL;
104 }
105
106 alias = d_materialise_unique(dentry, inode);
107 if (alias != NULL) {
108 dput(dentry);
109 if (IS_ERR(alias))
110 return NULL;
111 dentry = alias;
112 }
113
114 return dentry;
115 }
116
117 static void
118 cifs_fill_common_info(struct cifs_fattr *fattr, struct cifs_sb_info *cifs_sb)
119 {
120 fattr->cf_uid = cifs_sb->mnt_uid;
121 fattr->cf_gid = cifs_sb->mnt_gid;
122
123 if (fattr->cf_cifsattrs & ATTR_DIRECTORY) {
124 fattr->cf_mode = S_IFDIR | cifs_sb->mnt_dir_mode;
125 fattr->cf_dtype = DT_DIR;
126 } else {
127 fattr->cf_mode = S_IFREG | cifs_sb->mnt_file_mode;
128 fattr->cf_dtype = DT_REG;
129 }
130
131 if (fattr->cf_cifsattrs & ATTR_READONLY)
132 fattr->cf_mode &= ~S_IWUGO;
133
134 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL &&
135 fattr->cf_cifsattrs & ATTR_SYSTEM) {
136 if (fattr->cf_eof == 0) {
137 fattr->cf_mode &= ~S_IFMT;
138 fattr->cf_mode |= S_IFIFO;
139 fattr->cf_dtype = DT_FIFO;
140 } else {
141 /*
142 * trying to get the type and mode via SFU can be slow,
143 * so just call those regular files for now, and mark
144 * for reval
145 */
146 fattr->cf_flags |= CIFS_FATTR_NEED_REVAL;
147 }
148 }
149 }
150
151 static void
152 cifs_dir_info_to_fattr(struct cifs_fattr *fattr, FILE_DIRECTORY_INFO *info,
153 struct cifs_sb_info *cifs_sb)
154 {
155 memset(fattr, 0, sizeof(*fattr));
156 fattr->cf_cifsattrs = le32_to_cpu(info->ExtFileAttributes);
157 fattr->cf_eof = le64_to_cpu(info->EndOfFile);
158 fattr->cf_bytes = le64_to_cpu(info->AllocationSize);
159 fattr->cf_createtime = le64_to_cpu(info->CreationTime);
160 fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
161 fattr->cf_ctime = cifs_NTtimeToUnix(info->ChangeTime);
162 fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime);
163
164 cifs_fill_common_info(fattr, cifs_sb);
165 }
166
167 static void
168 cifs_std_info_to_fattr(struct cifs_fattr *fattr, FIND_FILE_STANDARD_INFO *info,
169 struct cifs_sb_info *cifs_sb)
170 {
171 int offset = cifs_sb_master_tcon(cifs_sb)->ses->server->timeAdj;
172
173 memset(fattr, 0, sizeof(*fattr));
174 fattr->cf_atime = cnvrtDosUnixTm(info->LastAccessDate,
175 info->LastAccessTime, offset);
176 fattr->cf_ctime = cnvrtDosUnixTm(info->LastWriteDate,
177 info->LastWriteTime, offset);
178 fattr->cf_mtime = cnvrtDosUnixTm(info->LastWriteDate,
179 info->LastWriteTime, offset);
180
181 fattr->cf_cifsattrs = le16_to_cpu(info->Attributes);
182 fattr->cf_bytes = le32_to_cpu(info->AllocationSize);
183 fattr->cf_eof = le32_to_cpu(info->DataSize);
184
185 cifs_fill_common_info(fattr, cifs_sb);
186 }
187
188 /* BB eventually need to add the following helper function to
189 resolve NT_STATUS_STOPPED_ON_SYMLINK return code when
190 we try to do FindFirst on (NTFS) directory symlinks */
191 /*
192 int get_symlink_reparse_path(char *full_path, struct cifs_sb_info *cifs_sb,
193 int xid)
194 {
195 __u16 fid;
196 int len;
197 int oplock = 0;
198 int rc;
199 struct cifs_tcon *ptcon = cifs_sb_tcon(cifs_sb);
200 char *tmpbuffer;
201
202 rc = CIFSSMBOpen(xid, ptcon, full_path, FILE_OPEN, GENERIC_READ,
203 OPEN_REPARSE_POINT, &fid, &oplock, NULL,
204 cifs_sb->local_nls,
205 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
206 if (!rc) {
207 tmpbuffer = kmalloc(maxpath);
208 rc = CIFSSMBQueryReparseLinkInfo(xid, ptcon, full_path,
209 tmpbuffer,
210 maxpath -1,
211 fid,
212 cifs_sb->local_nls);
213 if (CIFSSMBClose(xid, ptcon, fid)) {
214 cFYI(1, "Error closing temporary reparsepoint open");
215 }
216 }
217 }
218 */
219
220 static int initiate_cifs_search(const int xid, struct file *file)
221 {
222 int rc = 0;
223 char *full_path = NULL;
224 struct cifsFileInfo *cifsFile;
225 struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
226 struct tcon_link *tlink = NULL;
227 struct cifs_tcon *pTcon;
228
229 if (file->private_data == NULL) {
230 tlink = cifs_sb_tlink(cifs_sb);
231 if (IS_ERR(tlink))
232 return PTR_ERR(tlink);
233
234 cifsFile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
235 if (cifsFile == NULL) {
236 rc = -ENOMEM;
237 goto error_exit;
238 }
239 file->private_data = cifsFile;
240 cifsFile->tlink = cifs_get_tlink(tlink);
241 pTcon = tlink_tcon(tlink);
242 } else {
243 cifsFile = file->private_data;
244 pTcon = tlink_tcon(cifsFile->tlink);
245 }
246
247 cifsFile->invalidHandle = true;
248 cifsFile->srch_inf.endOfSearch = false;
249
250 full_path = build_path_from_dentry(file->f_path.dentry);
251 if (full_path == NULL) {
252 rc = -ENOMEM;
253 goto error_exit;
254 }
255
256 cFYI(1, "Full path: %s start at: %lld", full_path, file->f_pos);
257
258 ffirst_retry:
259 /* test for Unix extensions */
260 /* but now check for them on the share/mount not on the SMB session */
261 /* if (pTcon->ses->capabilities & CAP_UNIX) { */
262 if (pTcon->unix_ext)
263 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
264 else if ((pTcon->ses->capabilities &
265 (CAP_NT_SMBS | CAP_NT_FIND)) == 0) {
266 cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD;
267 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
268 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
269 } else /* not srvinos - BB fixme add check for backlevel? */ {
270 cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
271 }
272
273 rc = CIFSFindFirst(xid, pTcon, full_path, cifs_sb->local_nls,
274 &cifsFile->netfid, &cifsFile->srch_inf,
275 cifs_sb->mnt_cifs_flags &
276 CIFS_MOUNT_MAP_SPECIAL_CHR, CIFS_DIR_SEP(cifs_sb));
277 if (rc == 0)
278 cifsFile->invalidHandle = false;
279 /* BB add following call to handle readdir on new NTFS symlink errors
280 else if STATUS_STOPPED_ON_SYMLINK
281 call get_symlink_reparse_path and retry with new path */
282 else if ((rc == -EOPNOTSUPP) &&
283 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
284 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
285 goto ffirst_retry;
286 }
287 error_exit:
288 kfree(full_path);
289 cifs_put_tlink(tlink);
290 return rc;
291 }
292
293 /* return length of unicode string in bytes */
294 static int cifs_unicode_bytelen(const char *str)
295 {
296 int len;
297 const __le16 *ustr = (const __le16 *)str;
298
299 for (len = 0; len <= PATH_MAX; len++) {
300 if (ustr[len] == 0)
301 return len << 1;
302 }
303 cFYI(1, "Unicode string longer than PATH_MAX found");
304 return len << 1;
305 }
306
307 static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level)
308 {
309 char *new_entry;
310 FILE_DIRECTORY_INFO *pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
311
312 if (level == SMB_FIND_FILE_INFO_STANDARD) {
313 FIND_FILE_STANDARD_INFO *pfData;
314 pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo;
315
316 new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) +
317 pfData->FileNameLength;
318 } else
319 new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
320 cFYI(1, "new entry %p old entry %p", new_entry, old_entry);
321 /* validate that new_entry is not past end of SMB */
322 if (new_entry >= end_of_smb) {
323 cERROR(1, "search entry %p began after end of SMB %p old entry %p",
324 new_entry, end_of_smb, old_entry);
325 return NULL;
326 } else if (((level == SMB_FIND_FILE_INFO_STANDARD) &&
327 (new_entry + sizeof(FIND_FILE_STANDARD_INFO) > end_of_smb))
328 || ((level != SMB_FIND_FILE_INFO_STANDARD) &&
329 (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb))) {
330 cERROR(1, "search entry %p extends after end of SMB %p",
331 new_entry, end_of_smb);
332 return NULL;
333 } else
334 return new_entry;
335
336 }
337
338 struct cifs_dirent {
339 const char *name;
340 size_t namelen;
341 u32 resume_key;
342 u64 ino;
343 };
344
345 static void cifs_fill_dirent_unix(struct cifs_dirent *de,
346 const FILE_UNIX_INFO *info, bool is_unicode)
347 {
348 de->name = &info->FileName[0];
349 if (is_unicode)
350 de->namelen = cifs_unicode_bytelen(de->name);
351 else
352 de->namelen = strnlen(de->name, PATH_MAX);
353 de->resume_key = info->ResumeKey;
354 de->ino = le64_to_cpu(info->basic.UniqueId);
355 }
356
357 static void cifs_fill_dirent_dir(struct cifs_dirent *de,
358 const FILE_DIRECTORY_INFO *info)
359 {
360 de->name = &info->FileName[0];
361 de->namelen = le32_to_cpu(info->FileNameLength);
362 de->resume_key = info->FileIndex;
363 }
364
365 static void cifs_fill_dirent_full(struct cifs_dirent *de,
366 const FILE_FULL_DIRECTORY_INFO *info)
367 {
368 de->name = &info->FileName[0];
369 de->namelen = le32_to_cpu(info->FileNameLength);
370 de->resume_key = info->FileIndex;
371 }
372
373 static void cifs_fill_dirent_search(struct cifs_dirent *de,
374 const SEARCH_ID_FULL_DIR_INFO *info)
375 {
376 de->name = &info->FileName[0];
377 de->namelen = le32_to_cpu(info->FileNameLength);
378 de->resume_key = info->FileIndex;
379 de->ino = le64_to_cpu(info->UniqueId);
380 }
381
382 static void cifs_fill_dirent_both(struct cifs_dirent *de,
383 const FILE_BOTH_DIRECTORY_INFO *info)
384 {
385 de->name = &info->FileName[0];
386 de->namelen = le32_to_cpu(info->FileNameLength);
387 de->resume_key = info->FileIndex;
388 }
389
390 static void cifs_fill_dirent_std(struct cifs_dirent *de,
391 const FIND_FILE_STANDARD_INFO *info)
392 {
393 de->name = &info->FileName[0];
394 /* one byte length, no endianess conversion */
395 de->namelen = info->FileNameLength;
396 de->resume_key = info->ResumeKey;
397 }
398
399 static int cifs_fill_dirent(struct cifs_dirent *de, const void *info,
400 u16 level, bool is_unicode)
401 {
402 memset(de, 0, sizeof(*de));
403
404 switch (level) {
405 case SMB_FIND_FILE_UNIX:
406 cifs_fill_dirent_unix(de, info, is_unicode);
407 break;
408 case SMB_FIND_FILE_DIRECTORY_INFO:
409 cifs_fill_dirent_dir(de, info);
410 break;
411 case SMB_FIND_FILE_FULL_DIRECTORY_INFO:
412 cifs_fill_dirent_full(de, info);
413 break;
414 case SMB_FIND_FILE_ID_FULL_DIR_INFO:
415 cifs_fill_dirent_search(de, info);
416 break;
417 case SMB_FIND_FILE_BOTH_DIRECTORY_INFO:
418 cifs_fill_dirent_both(de, info);
419 break;
420 case SMB_FIND_FILE_INFO_STANDARD:
421 cifs_fill_dirent_std(de, info);
422 break;
423 default:
424 cFYI(1, "Unknown findfirst level %d", level);
425 return -EINVAL;
426 }
427
428 return 0;
429 }
430
431 #define UNICODE_DOT cpu_to_le16(0x2e)
432
433 /* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
434 static int cifs_entry_is_dot(struct cifs_dirent *de, bool is_unicode)
435 {
436 int rc = 0;
437
438 if (!de->name)
439 return 0;
440
441 if (is_unicode) {
442 __le16 *ufilename = (__le16 *)de->name;
443 if (de->namelen == 2) {
444 /* check for . */
445 if (ufilename[0] == UNICODE_DOT)
446 rc = 1;
447 } else if (de->namelen == 4) {
448 /* check for .. */
449 if (ufilename[0] == UNICODE_DOT &&
450 ufilename[1] == UNICODE_DOT)
451 rc = 2;
452 }
453 } else /* ASCII */ {
454 if (de->namelen == 1) {
455 if (de->name[0] == '.')
456 rc = 1;
457 } else if (de->namelen == 2) {
458 if (de->name[0] == '.' && de->name[1] == '.')
459 rc = 2;
460 }
461 }
462
463 return rc;
464 }
465
466 /* Check if directory that we are searching has changed so we can decide
467 whether we can use the cached search results from the previous search */
468 static int is_dir_changed(struct file *file)
469 {
470 struct inode *inode = file->f_path.dentry->d_inode;
471 struct cifsInodeInfo *cifsInfo = CIFS_I(inode);
472
473 if (cifsInfo->time == 0)
474 return 1; /* directory was changed, perhaps due to unlink */
475 else
476 return 0;
477
478 }
479
480 static int cifs_save_resume_key(const char *current_entry,
481 struct cifsFileInfo *file_info)
482 {
483 struct cifs_dirent de;
484 int rc;
485
486 rc = cifs_fill_dirent(&de, current_entry, file_info->srch_inf.info_level,
487 file_info->srch_inf.unicode);
488 if (!rc) {
489 file_info->srch_inf.presume_name = de.name;
490 file_info->srch_inf.resume_name_len = de.namelen;
491 file_info->srch_inf.resume_key = de.resume_key;
492 }
493 return rc;
494 }
495
496 /* find the corresponding entry in the search */
497 /* Note that the SMB server returns search entries for . and .. which
498 complicates logic here if we choose to parse for them and we do not
499 assume that they are located in the findfirst return buffer.*/
500 /* We start counting in the buffer with entry 2 and increment for every
501 entry (do not increment for . or .. entry) */
502 static int find_cifs_entry(const int xid, struct cifs_tcon *pTcon,
503 struct file *file, char **ppCurrentEntry, int *num_to_ret)
504 {
505 int rc = 0;
506 int pos_in_buf = 0;
507 loff_t first_entry_in_buffer;
508 loff_t index_to_find = file->f_pos;
509 struct cifsFileInfo *cifsFile = file->private_data;
510 /* check if index in the buffer */
511
512 if ((cifsFile == NULL) || (ppCurrentEntry == NULL) ||
513 (num_to_ret == NULL))
514 return -ENOENT;
515
516 *ppCurrentEntry = NULL;
517 first_entry_in_buffer =
518 cifsFile->srch_inf.index_of_last_entry -
519 cifsFile->srch_inf.entries_in_buffer;
520
521 /* if first entry in buf is zero then is first buffer
522 in search response data which means it is likely . and ..
523 will be in this buffer, although some servers do not return
524 . and .. for the root of a drive and for those we need
525 to start two entries earlier */
526
527 dump_cifs_file_struct(file, "In fce ");
528 if (((index_to_find < cifsFile->srch_inf.index_of_last_entry) &&
529 is_dir_changed(file)) ||
530 (index_to_find < first_entry_in_buffer)) {
531 /* close and restart search */
532 cFYI(1, "search backing up - close and restart search");
533 spin_lock(&cifs_file_list_lock);
534 if (!cifsFile->srch_inf.endOfSearch &&
535 !cifsFile->invalidHandle) {
536 cifsFile->invalidHandle = true;
537 spin_unlock(&cifs_file_list_lock);
538 CIFSFindClose(xid, pTcon, cifsFile->netfid);
539 } else
540 spin_unlock(&cifs_file_list_lock);
541 if (cifsFile->srch_inf.ntwrk_buf_start) {
542 cFYI(1, "freeing SMB ff cache buf on search rewind");
543 if (cifsFile->srch_inf.smallBuf)
544 cifs_small_buf_release(cifsFile->srch_inf.
545 ntwrk_buf_start);
546 else
547 cifs_buf_release(cifsFile->srch_inf.
548 ntwrk_buf_start);
549 cifsFile->srch_inf.ntwrk_buf_start = NULL;
550 }
551 rc = initiate_cifs_search(xid, file);
552 if (rc) {
553 cFYI(1, "error %d reinitiating a search on rewind",
554 rc);
555 return rc;
556 }
557 cifs_save_resume_key(cifsFile->srch_inf.last_entry, cifsFile);
558 }
559
560 while ((index_to_find >= cifsFile->srch_inf.index_of_last_entry) &&
561 (rc == 0) && !cifsFile->srch_inf.endOfSearch) {
562 cFYI(1, "calling findnext2");
563 rc = CIFSFindNext(xid, pTcon, cifsFile->netfid,
564 &cifsFile->srch_inf);
565 cifs_save_resume_key(cifsFile->srch_inf.last_entry, cifsFile);
566 if (rc)
567 return -ENOENT;
568 }
569 if (index_to_find < cifsFile->srch_inf.index_of_last_entry) {
570 /* we found the buffer that contains the entry */
571 /* scan and find it */
572 int i;
573 char *current_entry;
574 char *end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
575 smbCalcSize((struct smb_hdr *)
576 cifsFile->srch_inf.ntwrk_buf_start);
577
578 current_entry = cifsFile->srch_inf.srch_entries_start;
579 first_entry_in_buffer = cifsFile->srch_inf.index_of_last_entry
580 - cifsFile->srch_inf.entries_in_buffer;
581 pos_in_buf = index_to_find - first_entry_in_buffer;
582 cFYI(1, "found entry - pos_in_buf %d", pos_in_buf);
583
584 for (i = 0; (i < (pos_in_buf)) && (current_entry != NULL); i++) {
585 /* go entry by entry figuring out which is first */
586 current_entry = nxt_dir_entry(current_entry, end_of_smb,
587 cifsFile->srch_inf.info_level);
588 }
589 if ((current_entry == NULL) && (i < pos_in_buf)) {
590 /* BB fixme - check if we should flag this error */
591 cERROR(1, "reached end of buf searching for pos in buf"
592 " %d index to find %lld rc %d",
593 pos_in_buf, index_to_find, rc);
594 }
595 rc = 0;
596 *ppCurrentEntry = current_entry;
597 } else {
598 cFYI(1, "index not in buffer - could not findnext into it");
599 return 0;
600 }
601
602 if (pos_in_buf >= cifsFile->srch_inf.entries_in_buffer) {
603 cFYI(1, "can not return entries pos_in_buf beyond last");
604 *num_to_ret = 0;
605 } else
606 *num_to_ret = cifsFile->srch_inf.entries_in_buffer - pos_in_buf;
607
608 return rc;
609 }
610
611 static int cifs_filldir(char *find_entry, struct file *file, filldir_t filldir,
612 void *dirent, char *scratch_buf, unsigned int max_len)
613 {
614 struct cifsFileInfo *file_info = file->private_data;
615 struct super_block *sb = file->f_path.dentry->d_sb;
616 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
617 struct cifs_dirent de = { NULL, };
618 struct cifs_fattr fattr;
619 struct dentry *dentry;
620 struct qstr name;
621 int rc = 0;
622 ino_t ino;
623
624 rc = cifs_fill_dirent(&de, find_entry, file_info->srch_inf.info_level,
625 file_info->srch_inf.unicode);
626 if (rc)
627 return rc;
628
629 if (de.namelen > max_len) {
630 cERROR(1, "bad search response length %zd past smb end",
631 de.namelen);
632 return -EINVAL;
633 }
634
635 /* skip . and .. since we added them first */
636 if (cifs_entry_is_dot(&de, file_info->srch_inf.unicode))
637 return 0;
638
639 if (file_info->srch_inf.unicode) {
640 struct nls_table *nlt = cifs_sb->local_nls;
641
642 name.name = scratch_buf;
643 name.len =
644 cifs_from_ucs2((char *)name.name, (__le16 *)de.name,
645 UNICODE_NAME_MAX,
646 min(de.namelen, (size_t)max_len), nlt,
647 cifs_sb->mnt_cifs_flags &
648 CIFS_MOUNT_MAP_SPECIAL_CHR);
649 name.len -= nls_nullsize(nlt);
650 } else {
651 name.name = de.name;
652 name.len = de.namelen;
653 }
654
655 switch (file_info->srch_inf.info_level) {
656 case SMB_FIND_FILE_UNIX:
657 cifs_unix_basic_to_fattr(&fattr,
658 &((FILE_UNIX_INFO *)find_entry)->basic,
659 cifs_sb);
660 break;
661 case SMB_FIND_FILE_INFO_STANDARD:
662 cifs_std_info_to_fattr(&fattr,
663 (FIND_FILE_STANDARD_INFO *)find_entry,
664 cifs_sb);
665 break;
666 default:
667 cifs_dir_info_to_fattr(&fattr,
668 (FILE_DIRECTORY_INFO *)find_entry,
669 cifs_sb);
670 break;
671 }
672
673 if (de.ino && (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
674 fattr.cf_uniqueid = de.ino;
675 } else {
676 fattr.cf_uniqueid = iunique(sb, ROOT_I);
677 cifs_autodisable_serverino(cifs_sb);
678 }
679
680 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) &&
681 CIFSCouldBeMFSymlink(&fattr))
682 /*
683 * trying to get the type and mode can be slow,
684 * so just call those regular files for now, and mark
685 * for reval
686 */
687 fattr.cf_flags |= CIFS_FATTR_NEED_REVAL;
688
689 ino = cifs_uniqueid_to_ino_t(fattr.cf_uniqueid);
690 dentry = cifs_readdir_lookup(file->f_dentry, &name, &fattr);
691
692 rc = filldir(dirent, name.name, name.len, file->f_pos, ino,
693 fattr.cf_dtype);
694
695 dput(dentry);
696 return rc;
697 }
698
699
700 int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
701 {
702 int rc = 0;
703 int xid, i;
704 struct cifs_tcon *pTcon;
705 struct cifsFileInfo *cifsFile = NULL;
706 char *current_entry;
707 int num_to_fill = 0;
708 char *tmp_buf = NULL;
709 char *end_of_smb;
710 unsigned int max_len;
711
712 xid = GetXid();
713
714 /*
715 * Ensure FindFirst doesn't fail before doing filldir() for '.' and
716 * '..'. Otherwise we won't be able to notify VFS in case of failure.
717 */
718 if (file->private_data == NULL) {
719 rc = initiate_cifs_search(xid, file);
720 cFYI(1, "initiate cifs search rc %d", rc);
721 if (rc)
722 goto rddir2_exit;
723 }
724
725 switch ((int) file->f_pos) {
726 case 0:
727 if (filldir(direntry, ".", 1, file->f_pos,
728 file->f_path.dentry->d_inode->i_ino, DT_DIR) < 0) {
729 cERROR(1, "Filldir for current dir failed");
730 rc = -ENOMEM;
731 break;
732 }
733 file->f_pos++;
734 case 1:
735 if (filldir(direntry, "..", 2, file->f_pos,
736 parent_ino(file->f_path.dentry), DT_DIR) < 0) {
737 cERROR(1, "Filldir for parent dir failed");
738 rc = -ENOMEM;
739 break;
740 }
741 file->f_pos++;
742 default:
743 /* 1) If search is active,
744 is in current search buffer?
745 if it before then restart search
746 if after then keep searching till find it */
747
748 if (file->private_data == NULL) {
749 rc = -EINVAL;
750 FreeXid(xid);
751 return rc;
752 }
753 cifsFile = file->private_data;
754 if (cifsFile->srch_inf.endOfSearch) {
755 if (cifsFile->srch_inf.emptyDir) {
756 cFYI(1, "End of search, empty dir");
757 rc = 0;
758 break;
759 }
760 } /* else {
761 cifsFile->invalidHandle = true;
762 CIFSFindClose(xid, pTcon, cifsFile->netfid);
763 } */
764
765 pTcon = tlink_tcon(cifsFile->tlink);
766 rc = find_cifs_entry(xid, pTcon, file,
767 &current_entry, &num_to_fill);
768 if (rc) {
769 cFYI(1, "fce error %d", rc);
770 goto rddir2_exit;
771 } else if (current_entry != NULL) {
772 cFYI(1, "entry %lld found", file->f_pos);
773 } else {
774 cFYI(1, "could not find entry");
775 goto rddir2_exit;
776 }
777 cFYI(1, "loop through %d times filling dir for net buf %p",
778 num_to_fill, cifsFile->srch_inf.ntwrk_buf_start);
779 max_len = smbCalcSize((struct smb_hdr *)
780 cifsFile->srch_inf.ntwrk_buf_start);
781 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len;
782
783 tmp_buf = kmalloc(UNICODE_NAME_MAX, GFP_KERNEL);
784 if (tmp_buf == NULL) {
785 rc = -ENOMEM;
786 break;
787 }
788
789 for (i = 0; (i < num_to_fill) && (rc == 0); i++) {
790 if (current_entry == NULL) {
791 /* evaluate whether this case is an error */
792 cERROR(1, "past SMB end, num to fill %d i %d",
793 num_to_fill, i);
794 break;
795 }
796 /* if buggy server returns . and .. late do
797 we want to check for that here? */
798 rc = cifs_filldir(current_entry, file,
799 filldir, direntry, tmp_buf, max_len);
800 if (rc == -EOVERFLOW) {
801 rc = 0;
802 break;
803 }
804
805 file->f_pos++;
806 if (file->f_pos ==
807 cifsFile->srch_inf.index_of_last_entry) {
808 cFYI(1, "last entry in buf at pos %lld %s",
809 file->f_pos, tmp_buf);
810 cifs_save_resume_key(current_entry, cifsFile);
811 break;
812 } else
813 current_entry =
814 nxt_dir_entry(current_entry, end_of_smb,
815 cifsFile->srch_inf.info_level);
816 }
817 kfree(tmp_buf);
818 break;
819 } /* end switch */
820
821 rddir2_exit:
822 FreeXid(xid);
823 return rc;
824 }
kernel-based virtual machine