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Merge branches 'bugfix-battery', 'bugfix-misc', 'bugfix-rafael', 'bugfix-turbostat...
[deliverable/linux.git] / 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 * 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 __u16 search_flags;
223 int rc = 0;
224 char *full_path = NULL;
225 struct cifsFileInfo *cifsFile;
226 struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
227 struct tcon_link *tlink = NULL;
228 struct cifs_tcon *pTcon;
229
230 if (file->private_data == NULL) {
231 tlink = cifs_sb_tlink(cifs_sb);
232 if (IS_ERR(tlink))
233 return PTR_ERR(tlink);
234
235 cifsFile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
236 if (cifsFile == NULL) {
237 rc = -ENOMEM;
238 goto error_exit;
239 }
240 file->private_data = cifsFile;
241 cifsFile->tlink = cifs_get_tlink(tlink);
242 pTcon = tlink_tcon(tlink);
243 } else {
244 cifsFile = file->private_data;
245 pTcon = tlink_tcon(cifsFile->tlink);
246 }
247
248 cifsFile->invalidHandle = true;
249 cifsFile->srch_inf.endOfSearch = false;
250
251 full_path = build_path_from_dentry(file->f_path.dentry);
252 if (full_path == NULL) {
253 rc = -ENOMEM;
254 goto error_exit;
255 }
256
257 cFYI(1, "Full path: %s start at: %lld", full_path, file->f_pos);
258
259 ffirst_retry:
260 /* test for Unix extensions */
261 /* but now check for them on the share/mount not on the SMB session */
262 /* if (pTcon->ses->capabilities & CAP_UNIX) { */
263 if (pTcon->unix_ext)
264 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
265 else if ((pTcon->ses->capabilities &
266 (CAP_NT_SMBS | CAP_NT_FIND)) == 0) {
267 cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD;
268 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
269 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
270 } else /* not srvinos - BB fixme add check for backlevel? */ {
271 cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
272 }
273
274 search_flags = CIFS_SEARCH_CLOSE_AT_END | CIFS_SEARCH_RETURN_RESUME;
275 if (backup_cred(cifs_sb))
276 search_flags |= CIFS_SEARCH_BACKUP_SEARCH;
277
278 rc = CIFSFindFirst(xid, pTcon, full_path, cifs_sb->local_nls,
279 &cifsFile->netfid, search_flags, &cifsFile->srch_inf,
280 cifs_sb->mnt_cifs_flags &
281 CIFS_MOUNT_MAP_SPECIAL_CHR, CIFS_DIR_SEP(cifs_sb));
282 if (rc == 0)
283 cifsFile->invalidHandle = false;
284 /* BB add following call to handle readdir on new NTFS symlink errors
285 else if STATUS_STOPPED_ON_SYMLINK
286 call get_symlink_reparse_path and retry with new path */
287 else if ((rc == -EOPNOTSUPP) &&
288 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
289 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
290 goto ffirst_retry;
291 }
292 error_exit:
293 kfree(full_path);
294 cifs_put_tlink(tlink);
295 return rc;
296 }
297
298 /* return length of unicode string in bytes */
299 static int cifs_unicode_bytelen(const char *str)
300 {
301 int len;
302 const __le16 *ustr = (const __le16 *)str;
303
304 for (len = 0; len <= PATH_MAX; len++) {
305 if (ustr[len] == 0)
306 return len << 1;
307 }
308 cFYI(1, "Unicode string longer than PATH_MAX found");
309 return len << 1;
310 }
311
312 static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level)
313 {
314 char *new_entry;
315 FILE_DIRECTORY_INFO *pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
316
317 if (level == SMB_FIND_FILE_INFO_STANDARD) {
318 FIND_FILE_STANDARD_INFO *pfData;
319 pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo;
320
321 new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) +
322 pfData->FileNameLength;
323 } else
324 new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
325 cFYI(1, "new entry %p old entry %p", new_entry, old_entry);
326 /* validate that new_entry is not past end of SMB */
327 if (new_entry >= end_of_smb) {
328 cERROR(1, "search entry %p began after end of SMB %p old entry %p",
329 new_entry, end_of_smb, old_entry);
330 return NULL;
331 } else if (((level == SMB_FIND_FILE_INFO_STANDARD) &&
332 (new_entry + sizeof(FIND_FILE_STANDARD_INFO) > end_of_smb))
333 || ((level != SMB_FIND_FILE_INFO_STANDARD) &&
334 (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb))) {
335 cERROR(1, "search entry %p extends after end of SMB %p",
336 new_entry, end_of_smb);
337 return NULL;
338 } else
339 return new_entry;
340
341 }
342
343 struct cifs_dirent {
344 const char *name;
345 size_t namelen;
346 u32 resume_key;
347 u64 ino;
348 };
349
350 static void cifs_fill_dirent_unix(struct cifs_dirent *de,
351 const FILE_UNIX_INFO *info, bool is_unicode)
352 {
353 de->name = &info->FileName[0];
354 if (is_unicode)
355 de->namelen = cifs_unicode_bytelen(de->name);
356 else
357 de->namelen = strnlen(de->name, PATH_MAX);
358 de->resume_key = info->ResumeKey;
359 de->ino = le64_to_cpu(info->basic.UniqueId);
360 }
361
362 static void cifs_fill_dirent_dir(struct cifs_dirent *de,
363 const FILE_DIRECTORY_INFO *info)
364 {
365 de->name = &info->FileName[0];
366 de->namelen = le32_to_cpu(info->FileNameLength);
367 de->resume_key = info->FileIndex;
368 }
369
370 static void cifs_fill_dirent_full(struct cifs_dirent *de,
371 const FILE_FULL_DIRECTORY_INFO *info)
372 {
373 de->name = &info->FileName[0];
374 de->namelen = le32_to_cpu(info->FileNameLength);
375 de->resume_key = info->FileIndex;
376 }
377
378 static void cifs_fill_dirent_search(struct cifs_dirent *de,
379 const SEARCH_ID_FULL_DIR_INFO *info)
380 {
381 de->name = &info->FileName[0];
382 de->namelen = le32_to_cpu(info->FileNameLength);
383 de->resume_key = info->FileIndex;
384 de->ino = le64_to_cpu(info->UniqueId);
385 }
386
387 static void cifs_fill_dirent_both(struct cifs_dirent *de,
388 const FILE_BOTH_DIRECTORY_INFO *info)
389 {
390 de->name = &info->FileName[0];
391 de->namelen = le32_to_cpu(info->FileNameLength);
392 de->resume_key = info->FileIndex;
393 }
394
395 static void cifs_fill_dirent_std(struct cifs_dirent *de,
396 const FIND_FILE_STANDARD_INFO *info)
397 {
398 de->name = &info->FileName[0];
399 /* one byte length, no endianess conversion */
400 de->namelen = info->FileNameLength;
401 de->resume_key = info->ResumeKey;
402 }
403
404 static int cifs_fill_dirent(struct cifs_dirent *de, const void *info,
405 u16 level, bool is_unicode)
406 {
407 memset(de, 0, sizeof(*de));
408
409 switch (level) {
410 case SMB_FIND_FILE_UNIX:
411 cifs_fill_dirent_unix(de, info, is_unicode);
412 break;
413 case SMB_FIND_FILE_DIRECTORY_INFO:
414 cifs_fill_dirent_dir(de, info);
415 break;
416 case SMB_FIND_FILE_FULL_DIRECTORY_INFO:
417 cifs_fill_dirent_full(de, info);
418 break;
419 case SMB_FIND_FILE_ID_FULL_DIR_INFO:
420 cifs_fill_dirent_search(de, info);
421 break;
422 case SMB_FIND_FILE_BOTH_DIRECTORY_INFO:
423 cifs_fill_dirent_both(de, info);
424 break;
425 case SMB_FIND_FILE_INFO_STANDARD:
426 cifs_fill_dirent_std(de, info);
427 break;
428 default:
429 cFYI(1, "Unknown findfirst level %d", level);
430 return -EINVAL;
431 }
432
433 return 0;
434 }
435
436 #define UNICODE_DOT cpu_to_le16(0x2e)
437
438 /* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
439 static int cifs_entry_is_dot(struct cifs_dirent *de, bool is_unicode)
440 {
441 int rc = 0;
442
443 if (!de->name)
444 return 0;
445
446 if (is_unicode) {
447 __le16 *ufilename = (__le16 *)de->name;
448 if (de->namelen == 2) {
449 /* check for . */
450 if (ufilename[0] == UNICODE_DOT)
451 rc = 1;
452 } else if (de->namelen == 4) {
453 /* check for .. */
454 if (ufilename[0] == UNICODE_DOT &&
455 ufilename[1] == UNICODE_DOT)
456 rc = 2;
457 }
458 } else /* ASCII */ {
459 if (de->namelen == 1) {
460 if (de->name[0] == '.')
461 rc = 1;
462 } else if (de->namelen == 2) {
463 if (de->name[0] == '.' && de->name[1] == '.')
464 rc = 2;
465 }
466 }
467
468 return rc;
469 }
470
471 /* Check if directory that we are searching has changed so we can decide
472 whether we can use the cached search results from the previous search */
473 static int is_dir_changed(struct file *file)
474 {
475 struct inode *inode = file->f_path.dentry->d_inode;
476 struct cifsInodeInfo *cifsInfo = CIFS_I(inode);
477
478 if (cifsInfo->time == 0)
479 return 1; /* directory was changed, perhaps due to unlink */
480 else
481 return 0;
482
483 }
484
485 static int cifs_save_resume_key(const char *current_entry,
486 struct cifsFileInfo *file_info)
487 {
488 struct cifs_dirent de;
489 int rc;
490
491 rc = cifs_fill_dirent(&de, current_entry, file_info->srch_inf.info_level,
492 file_info->srch_inf.unicode);
493 if (!rc) {
494 file_info->srch_inf.presume_name = de.name;
495 file_info->srch_inf.resume_name_len = de.namelen;
496 file_info->srch_inf.resume_key = de.resume_key;
497 }
498 return rc;
499 }
500
501 /* find the corresponding entry in the search */
502 /* Note that the SMB server returns search entries for . and .. which
503 complicates logic here if we choose to parse for them and we do not
504 assume that they are located in the findfirst return buffer.*/
505 /* We start counting in the buffer with entry 2 and increment for every
506 entry (do not increment for . or .. entry) */
507 static int find_cifs_entry(const int xid, struct cifs_tcon *pTcon,
508 struct file *file, char **ppCurrentEntry, int *num_to_ret)
509 {
510 __u16 search_flags;
511 int rc = 0;
512 int pos_in_buf = 0;
513 loff_t first_entry_in_buffer;
514 loff_t index_to_find = file->f_pos;
515 struct cifsFileInfo *cifsFile = file->private_data;
516 struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
517 /* check if index in the buffer */
518
519 if ((cifsFile == NULL) || (ppCurrentEntry == NULL) ||
520 (num_to_ret == NULL))
521 return -ENOENT;
522
523 *ppCurrentEntry = NULL;
524 first_entry_in_buffer =
525 cifsFile->srch_inf.index_of_last_entry -
526 cifsFile->srch_inf.entries_in_buffer;
527
528 /* if first entry in buf is zero then is first buffer
529 in search response data which means it is likely . and ..
530 will be in this buffer, although some servers do not return
531 . and .. for the root of a drive and for those we need
532 to start two entries earlier */
533
534 dump_cifs_file_struct(file, "In fce ");
535 if (((index_to_find < cifsFile->srch_inf.index_of_last_entry) &&
536 is_dir_changed(file)) ||
537 (index_to_find < first_entry_in_buffer)) {
538 /* close and restart search */
539 cFYI(1, "search backing up - close and restart search");
540 spin_lock(&cifs_file_list_lock);
541 if (!cifsFile->srch_inf.endOfSearch &&
542 !cifsFile->invalidHandle) {
543 cifsFile->invalidHandle = true;
544 spin_unlock(&cifs_file_list_lock);
545 CIFSFindClose(xid, pTcon, cifsFile->netfid);
546 } else
547 spin_unlock(&cifs_file_list_lock);
548 if (cifsFile->srch_inf.ntwrk_buf_start) {
549 cFYI(1, "freeing SMB ff cache buf on search rewind");
550 if (cifsFile->srch_inf.smallBuf)
551 cifs_small_buf_release(cifsFile->srch_inf.
552 ntwrk_buf_start);
553 else
554 cifs_buf_release(cifsFile->srch_inf.
555 ntwrk_buf_start);
556 cifsFile->srch_inf.ntwrk_buf_start = NULL;
557 }
558 rc = initiate_cifs_search(xid, file);
559 if (rc) {
560 cFYI(1, "error %d reinitiating a search on rewind",
561 rc);
562 return rc;
563 }
564 /* FindFirst/Next set last_entry to NULL on malformed reply */
565 if (cifsFile->srch_inf.last_entry)
566 cifs_save_resume_key(cifsFile->srch_inf.last_entry,
567 cifsFile);
568 }
569
570 search_flags = CIFS_SEARCH_CLOSE_AT_END | CIFS_SEARCH_RETURN_RESUME;
571 if (backup_cred(cifs_sb))
572 search_flags |= CIFS_SEARCH_BACKUP_SEARCH;
573
574 while ((index_to_find >= cifsFile->srch_inf.index_of_last_entry) &&
575 (rc == 0) && !cifsFile->srch_inf.endOfSearch) {
576 cFYI(1, "calling findnext2");
577 rc = CIFSFindNext(xid, pTcon, cifsFile->netfid, search_flags,
578 &cifsFile->srch_inf);
579 /* FindFirst/Next set last_entry to NULL on malformed reply */
580 if (cifsFile->srch_inf.last_entry)
581 cifs_save_resume_key(cifsFile->srch_inf.last_entry,
582 cifsFile);
583 if (rc)
584 return -ENOENT;
585 }
586 if (index_to_find < cifsFile->srch_inf.index_of_last_entry) {
587 /* we found the buffer that contains the entry */
588 /* scan and find it */
589 int i;
590 char *current_entry;
591 char *end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
592 smbCalcSize((struct smb_hdr *)
593 cifsFile->srch_inf.ntwrk_buf_start);
594
595 current_entry = cifsFile->srch_inf.srch_entries_start;
596 first_entry_in_buffer = cifsFile->srch_inf.index_of_last_entry
597 - cifsFile->srch_inf.entries_in_buffer;
598 pos_in_buf = index_to_find - first_entry_in_buffer;
599 cFYI(1, "found entry - pos_in_buf %d", pos_in_buf);
600
601 for (i = 0; (i < (pos_in_buf)) && (current_entry != NULL); i++) {
602 /* go entry by entry figuring out which is first */
603 current_entry = nxt_dir_entry(current_entry, end_of_smb,
604 cifsFile->srch_inf.info_level);
605 }
606 if ((current_entry == NULL) && (i < pos_in_buf)) {
607 /* BB fixme - check if we should flag this error */
608 cERROR(1, "reached end of buf searching for pos in buf"
609 " %d index to find %lld rc %d",
610 pos_in_buf, index_to_find, rc);
611 }
612 rc = 0;
613 *ppCurrentEntry = current_entry;
614 } else {
615 cFYI(1, "index not in buffer - could not findnext into it");
616 return 0;
617 }
618
619 if (pos_in_buf >= cifsFile->srch_inf.entries_in_buffer) {
620 cFYI(1, "can not return entries pos_in_buf beyond last");
621 *num_to_ret = 0;
622 } else
623 *num_to_ret = cifsFile->srch_inf.entries_in_buffer - pos_in_buf;
624
625 return rc;
626 }
627
628 static int cifs_filldir(char *find_entry, struct file *file, filldir_t filldir,
629 void *dirent, char *scratch_buf, unsigned int max_len)
630 {
631 struct cifsFileInfo *file_info = file->private_data;
632 struct super_block *sb = file->f_path.dentry->d_sb;
633 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
634 struct cifs_dirent de = { NULL, };
635 struct cifs_fattr fattr;
636 struct dentry *dentry;
637 struct qstr name;
638 int rc = 0;
639 ino_t ino;
640
641 rc = cifs_fill_dirent(&de, find_entry, file_info->srch_inf.info_level,
642 file_info->srch_inf.unicode);
643 if (rc)
644 return rc;
645
646 if (de.namelen > max_len) {
647 cERROR(1, "bad search response length %zd past smb end",
648 de.namelen);
649 return -EINVAL;
650 }
651
652 /* skip . and .. since we added them first */
653 if (cifs_entry_is_dot(&de, file_info->srch_inf.unicode))
654 return 0;
655
656 if (file_info->srch_inf.unicode) {
657 struct nls_table *nlt = cifs_sb->local_nls;
658
659 name.name = scratch_buf;
660 name.len =
661 cifs_from_utf16((char *)name.name, (__le16 *)de.name,
662 UNICODE_NAME_MAX,
663 min_t(size_t, de.namelen,
664 (size_t)max_len), nlt,
665 cifs_sb->mnt_cifs_flags &
666 CIFS_MOUNT_MAP_SPECIAL_CHR);
667 name.len -= nls_nullsize(nlt);
668 } else {
669 name.name = de.name;
670 name.len = de.namelen;
671 }
672
673 switch (file_info->srch_inf.info_level) {
674 case SMB_FIND_FILE_UNIX:
675 cifs_unix_basic_to_fattr(&fattr,
676 &((FILE_UNIX_INFO *)find_entry)->basic,
677 cifs_sb);
678 break;
679 case SMB_FIND_FILE_INFO_STANDARD:
680 cifs_std_info_to_fattr(&fattr,
681 (FIND_FILE_STANDARD_INFO *)find_entry,
682 cifs_sb);
683 break;
684 default:
685 cifs_dir_info_to_fattr(&fattr,
686 (FILE_DIRECTORY_INFO *)find_entry,
687 cifs_sb);
688 break;
689 }
690
691 if (de.ino && (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
692 fattr.cf_uniqueid = de.ino;
693 } else {
694 fattr.cf_uniqueid = iunique(sb, ROOT_I);
695 cifs_autodisable_serverino(cifs_sb);
696 }
697
698 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) &&
699 CIFSCouldBeMFSymlink(&fattr))
700 /*
701 * trying to get the type and mode can be slow,
702 * so just call those regular files for now, and mark
703 * for reval
704 */
705 fattr.cf_flags |= CIFS_FATTR_NEED_REVAL;
706
707 ino = cifs_uniqueid_to_ino_t(fattr.cf_uniqueid);
708 dentry = cifs_readdir_lookup(file->f_dentry, &name, &fattr);
709
710 rc = filldir(dirent, name.name, name.len, file->f_pos, ino,
711 fattr.cf_dtype);
712
713 dput(dentry);
714 return rc;
715 }
716
717
718 int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
719 {
720 int rc = 0;
721 int xid, i;
722 struct cifs_tcon *pTcon;
723 struct cifsFileInfo *cifsFile = NULL;
724 char *current_entry;
725 int num_to_fill = 0;
726 char *tmp_buf = NULL;
727 char *end_of_smb;
728 unsigned int max_len;
729
730 xid = GetXid();
731
732 /*
733 * Ensure FindFirst doesn't fail before doing filldir() for '.' and
734 * '..'. Otherwise we won't be able to notify VFS in case of failure.
735 */
736 if (file->private_data == NULL) {
737 rc = initiate_cifs_search(xid, file);
738 cFYI(1, "initiate cifs search rc %d", rc);
739 if (rc)
740 goto rddir2_exit;
741 }
742
743 switch ((int) file->f_pos) {
744 case 0:
745 if (filldir(direntry, ".", 1, file->f_pos,
746 file->f_path.dentry->d_inode->i_ino, DT_DIR) < 0) {
747 cERROR(1, "Filldir for current dir failed");
748 rc = -ENOMEM;
749 break;
750 }
751 file->f_pos++;
752 case 1:
753 if (filldir(direntry, "..", 2, file->f_pos,
754 parent_ino(file->f_path.dentry), DT_DIR) < 0) {
755 cERROR(1, "Filldir for parent dir failed");
756 rc = -ENOMEM;
757 break;
758 }
759 file->f_pos++;
760 default:
761 /* 1) If search is active,
762 is in current search buffer?
763 if it before then restart search
764 if after then keep searching till find it */
765
766 if (file->private_data == NULL) {
767 rc = -EINVAL;
768 FreeXid(xid);
769 return rc;
770 }
771 cifsFile = file->private_data;
772 if (cifsFile->srch_inf.endOfSearch) {
773 if (cifsFile->srch_inf.emptyDir) {
774 cFYI(1, "End of search, empty dir");
775 rc = 0;
776 break;
777 }
778 } /* else {
779 cifsFile->invalidHandle = true;
780 CIFSFindClose(xid, pTcon, cifsFile->netfid);
781 } */
782
783 pTcon = tlink_tcon(cifsFile->tlink);
784 rc = find_cifs_entry(xid, pTcon, file,
785 &current_entry, &num_to_fill);
786 if (rc) {
787 cFYI(1, "fce error %d", rc);
788 goto rddir2_exit;
789 } else if (current_entry != NULL) {
790 cFYI(1, "entry %lld found", file->f_pos);
791 } else {
792 cFYI(1, "could not find entry");
793 goto rddir2_exit;
794 }
795 cFYI(1, "loop through %d times filling dir for net buf %p",
796 num_to_fill, cifsFile->srch_inf.ntwrk_buf_start);
797 max_len = smbCalcSize((struct smb_hdr *)
798 cifsFile->srch_inf.ntwrk_buf_start);
799 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len;
800
801 tmp_buf = kmalloc(UNICODE_NAME_MAX, GFP_KERNEL);
802 if (tmp_buf == NULL) {
803 rc = -ENOMEM;
804 break;
805 }
806
807 for (i = 0; (i < num_to_fill) && (rc == 0); i++) {
808 if (current_entry == NULL) {
809 /* evaluate whether this case is an error */
810 cERROR(1, "past SMB end, num to fill %d i %d",
811 num_to_fill, i);
812 break;
813 }
814 /* if buggy server returns . and .. late do
815 we want to check for that here? */
816 rc = cifs_filldir(current_entry, file,
817 filldir, direntry, tmp_buf, max_len);
818 if (rc == -EOVERFLOW) {
819 rc = 0;
820 break;
821 }
822
823 file->f_pos++;
824 if (file->f_pos ==
825 cifsFile->srch_inf.index_of_last_entry) {
826 cFYI(1, "last entry in buf at pos %lld %s",
827 file->f_pos, tmp_buf);
828 cifs_save_resume_key(current_entry, cifsFile);
829 break;
830 } else
831 current_entry =
832 nxt_dir_entry(current_entry, end_of_smb,
833 cifsFile->srch_inf.info_level);
834 }
835 kfree(tmp_buf);
836 break;
837 } /* end switch */
838
839 rddir2_exit:
840 FreeXid(xid);
841 return rc;
842 }
Linux kernel - Deliverables
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