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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 * 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
44static 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
63static 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 */
72static struct dentry *
73cifs_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 inode = dentry->d_inode;
90 /* update inode in place if i_ino didn't change */
91 if (inode && CIFS_I(inode)->uniqueid == fattr->cf_uniqueid) {
92 cifs_fattr_to_inode(inode, fattr);
93 return dentry;
94 }
95 d_drop(dentry);
96 dput(dentry);
97 }
98
99 dentry = d_alloc(parent, name);
100 if (dentry == NULL)
101 return NULL;
102
103 inode = cifs_iget(sb, fattr);
104 if (!inode) {
105 dput(dentry);
106 return NULL;
107 }
108
109 alias = d_materialise_unique(dentry, inode);
110 if (alias != NULL) {
111 dput(dentry);
112 if (IS_ERR(alias))
113 return NULL;
114 dentry = alias;
115 }
116
117 return dentry;
118}
119
120static void
121cifs_fill_common_info(struct cifs_fattr *fattr, struct cifs_sb_info *cifs_sb)
122{
123 fattr->cf_uid = cifs_sb->mnt_uid;
124 fattr->cf_gid = cifs_sb->mnt_gid;
125
126 if (fattr->cf_cifsattrs & ATTR_DIRECTORY) {
127 fattr->cf_mode = S_IFDIR | cifs_sb->mnt_dir_mode;
128 fattr->cf_dtype = DT_DIR;
129 } else {
130 fattr->cf_mode = S_IFREG | cifs_sb->mnt_file_mode;
131 fattr->cf_dtype = DT_REG;
132 }
133
134 if (fattr->cf_cifsattrs & ATTR_READONLY)
135 fattr->cf_mode &= ~S_IWUGO;
136
137 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL &&
138 fattr->cf_cifsattrs & ATTR_SYSTEM) {
139 if (fattr->cf_eof == 0) {
140 fattr->cf_mode &= ~S_IFMT;
141 fattr->cf_mode |= S_IFIFO;
142 fattr->cf_dtype = DT_FIFO;
143 } else {
144 /*
145 * trying to get the type and mode via SFU can be slow,
146 * so just call those regular files for now, and mark
147 * for reval
148 */
149 fattr->cf_flags |= CIFS_FATTR_NEED_REVAL;
150 }
151 }
152}
153
154static void
155cifs_dir_info_to_fattr(struct cifs_fattr *fattr, FILE_DIRECTORY_INFO *info,
156 struct cifs_sb_info *cifs_sb)
157{
158 memset(fattr, 0, sizeof(*fattr));
159 fattr->cf_cifsattrs = le32_to_cpu(info->ExtFileAttributes);
160 fattr->cf_eof = le64_to_cpu(info->EndOfFile);
161 fattr->cf_bytes = le64_to_cpu(info->AllocationSize);
162 fattr->cf_createtime = le64_to_cpu(info->CreationTime);
163 fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
164 fattr->cf_ctime = cifs_NTtimeToUnix(info->ChangeTime);
165 fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime);
166
167 cifs_fill_common_info(fattr, cifs_sb);
168}
169
170static void
171cifs_std_info_to_fattr(struct cifs_fattr *fattr, FIND_FILE_STANDARD_INFO *info,
172 struct cifs_sb_info *cifs_sb)
173{
174 int offset = cifs_sb_master_tcon(cifs_sb)->ses->server->timeAdj;
175
176 memset(fattr, 0, sizeof(*fattr));
177 fattr->cf_atime = cnvrtDosUnixTm(info->LastAccessDate,
178 info->LastAccessTime, offset);
179 fattr->cf_ctime = cnvrtDosUnixTm(info->LastWriteDate,
180 info->LastWriteTime, offset);
181 fattr->cf_mtime = cnvrtDosUnixTm(info->LastWriteDate,
182 info->LastWriteTime, offset);
183
184 fattr->cf_cifsattrs = le16_to_cpu(info->Attributes);
185 fattr->cf_bytes = le32_to_cpu(info->AllocationSize);
186 fattr->cf_eof = le32_to_cpu(info->DataSize);
187
188 cifs_fill_common_info(fattr, cifs_sb);
189}
190
191/* BB eventually need to add the following helper function to
192 resolve NT_STATUS_STOPPED_ON_SYMLINK return code when
193 we try to do FindFirst on (NTFS) directory symlinks */
194/*
195int get_symlink_reparse_path(char *full_path, struct cifs_sb_info *cifs_sb,
196 int xid)
197{
198 __u16 fid;
199 int len;
200 int oplock = 0;
201 int rc;
202 struct cifs_tcon *ptcon = cifs_sb_tcon(cifs_sb);
203 char *tmpbuffer;
204
205 rc = CIFSSMBOpen(xid, ptcon, full_path, FILE_OPEN, GENERIC_READ,
206 OPEN_REPARSE_POINT, &fid, &oplock, NULL,
207 cifs_sb->local_nls,
208 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
209 if (!rc) {
210 tmpbuffer = kmalloc(maxpath);
211 rc = CIFSSMBQueryReparseLinkInfo(xid, ptcon, full_path,
212 tmpbuffer,
213 maxpath -1,
214 fid,
215 cifs_sb->local_nls);
216 if (CIFSSMBClose(xid, ptcon, fid)) {
217 cFYI(1, "Error closing temporary reparsepoint open");
218 }
219 }
220}
221 */
222
223static int initiate_cifs_search(const int xid, struct file *file)
224{
225 __u16 search_flags;
226 int rc = 0;
227 char *full_path = NULL;
228 struct cifsFileInfo *cifsFile;
229 struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
230 struct tcon_link *tlink = NULL;
231 struct cifs_tcon *pTcon;
232
233 if (file->private_data == NULL) {
234 tlink = cifs_sb_tlink(cifs_sb);
235 if (IS_ERR(tlink))
236 return PTR_ERR(tlink);
237
238 cifsFile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
239 if (cifsFile == NULL) {
240 rc = -ENOMEM;
241 goto error_exit;
242 }
243 file->private_data = cifsFile;
244 cifsFile->tlink = cifs_get_tlink(tlink);
245 pTcon = tlink_tcon(tlink);
246 } else {
247 cifsFile = file->private_data;
248 pTcon = tlink_tcon(cifsFile->tlink);
249 }
250
251 cifsFile->invalidHandle = true;
252 cifsFile->srch_inf.endOfSearch = false;
253
254 full_path = build_path_from_dentry(file->f_path.dentry);
255 if (full_path == NULL) {
256 rc = -ENOMEM;
257 goto error_exit;
258 }
259
260 cFYI(1, "Full path: %s start at: %lld", full_path, file->f_pos);
261
262ffirst_retry:
263 /* test for Unix extensions */
264 /* but now check for them on the share/mount not on the SMB session */
265/* if (pTcon->ses->capabilities & CAP_UNIX) { */
266 if (pTcon->unix_ext)
267 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
268 else if ((pTcon->ses->capabilities &
269 (CAP_NT_SMBS | CAP_NT_FIND)) == 0) {
270 cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD;
271 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
272 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
273 } else /* not srvinos - BB fixme add check for backlevel? */ {
274 cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
275 }
276
277 search_flags = CIFS_SEARCH_CLOSE_AT_END | CIFS_SEARCH_RETURN_RESUME;
278 if (backup_cred(cifs_sb))
279 search_flags |= CIFS_SEARCH_BACKUP_SEARCH;
280
281 rc = CIFSFindFirst(xid, pTcon, full_path, cifs_sb->local_nls,
282 &cifsFile->netfid, search_flags, &cifsFile->srch_inf,
283 cifs_sb->mnt_cifs_flags &
284 CIFS_MOUNT_MAP_SPECIAL_CHR, CIFS_DIR_SEP(cifs_sb));
285 if (rc == 0)
286 cifsFile->invalidHandle = false;
287 /* BB add following call to handle readdir on new NTFS symlink errors
288 else if STATUS_STOPPED_ON_SYMLINK
289 call get_symlink_reparse_path and retry with new path */
290 else if ((rc == -EOPNOTSUPP) &&
291 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
292 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
293 goto ffirst_retry;
294 }
295error_exit:
296 kfree(full_path);
297 cifs_put_tlink(tlink);
298 return rc;
299}
300
301/* return length of unicode string in bytes */
302static int cifs_unicode_bytelen(const char *str)
303{
304 int len;
305 const __le16 *ustr = (const __le16 *)str;
306
307 for (len = 0; len <= PATH_MAX; len++) {
308 if (ustr[len] == 0)
309 return len << 1;
310 }
311 cFYI(1, "Unicode string longer than PATH_MAX found");
312 return len << 1;
313}
314
315static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level)
316{
317 char *new_entry;
318 FILE_DIRECTORY_INFO *pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
319
320 if (level == SMB_FIND_FILE_INFO_STANDARD) {
321 FIND_FILE_STANDARD_INFO *pfData;
322 pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo;
323
324 new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) +
325 pfData->FileNameLength;
326 } else
327 new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
328 cFYI(1, "new entry %p old entry %p", new_entry, old_entry);
329 /* validate that new_entry is not past end of SMB */
330 if (new_entry >= end_of_smb) {
331 cERROR(1, "search entry %p began after end of SMB %p old entry %p",
332 new_entry, end_of_smb, old_entry);
333 return NULL;
334 } else if (((level == SMB_FIND_FILE_INFO_STANDARD) &&
335 (new_entry + sizeof(FIND_FILE_STANDARD_INFO) > end_of_smb))
336 || ((level != SMB_FIND_FILE_INFO_STANDARD) &&
337 (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb))) {
338 cERROR(1, "search entry %p extends after end of SMB %p",
339 new_entry, end_of_smb);
340 return NULL;
341 } else
342 return new_entry;
343
344}
345
346struct cifs_dirent {
347 const char *name;
348 size_t namelen;
349 u32 resume_key;
350 u64 ino;
351};
352
353static void cifs_fill_dirent_unix(struct cifs_dirent *de,
354 const FILE_UNIX_INFO *info, bool is_unicode)
355{
356 de->name = &info->FileName[0];
357 if (is_unicode)
358 de->namelen = cifs_unicode_bytelen(de->name);
359 else
360 de->namelen = strnlen(de->name, PATH_MAX);
361 de->resume_key = info->ResumeKey;
362 de->ino = le64_to_cpu(info->basic.UniqueId);
363}
364
365static void cifs_fill_dirent_dir(struct cifs_dirent *de,
366 const FILE_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
373static void cifs_fill_dirent_full(struct cifs_dirent *de,
374 const FILE_FULL_DIRECTORY_INFO *info)
375{
376 de->name = &info->FileName[0];
377 de->namelen = le32_to_cpu(info->FileNameLength);
378 de->resume_key = info->FileIndex;
379}
380
381static void cifs_fill_dirent_search(struct cifs_dirent *de,
382 const SEARCH_ID_FULL_DIR_INFO *info)
383{
384 de->name = &info->FileName[0];
385 de->namelen = le32_to_cpu(info->FileNameLength);
386 de->resume_key = info->FileIndex;
387 de->ino = le64_to_cpu(info->UniqueId);
388}
389
390static void cifs_fill_dirent_both(struct cifs_dirent *de,
391 const FILE_BOTH_DIRECTORY_INFO *info)
392{
393 de->name = &info->FileName[0];
394 de->namelen = le32_to_cpu(info->FileNameLength);
395 de->resume_key = info->FileIndex;
396}
397
398static void cifs_fill_dirent_std(struct cifs_dirent *de,
399 const FIND_FILE_STANDARD_INFO *info)
400{
401 de->name = &info->FileName[0];
402 /* one byte length, no endianess conversion */
403 de->namelen = info->FileNameLength;
404 de->resume_key = info->ResumeKey;
405}
406
407static int cifs_fill_dirent(struct cifs_dirent *de, const void *info,
408 u16 level, bool is_unicode)
409{
410 memset(de, 0, sizeof(*de));
411
412 switch (level) {
413 case SMB_FIND_FILE_UNIX:
414 cifs_fill_dirent_unix(de, info, is_unicode);
415 break;
416 case SMB_FIND_FILE_DIRECTORY_INFO:
417 cifs_fill_dirent_dir(de, info);
418 break;
419 case SMB_FIND_FILE_FULL_DIRECTORY_INFO:
420 cifs_fill_dirent_full(de, info);
421 break;
422 case SMB_FIND_FILE_ID_FULL_DIR_INFO:
423 cifs_fill_dirent_search(de, info);
424 break;
425 case SMB_FIND_FILE_BOTH_DIRECTORY_INFO:
426 cifs_fill_dirent_both(de, info);
427 break;
428 case SMB_FIND_FILE_INFO_STANDARD:
429 cifs_fill_dirent_std(de, info);
430 break;
431 default:
432 cFYI(1, "Unknown findfirst level %d", level);
433 return -EINVAL;
434 }
435
436 return 0;
437}
438
439#define UNICODE_DOT cpu_to_le16(0x2e)
440
441/* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
442static int cifs_entry_is_dot(struct cifs_dirent *de, bool is_unicode)
443{
444 int rc = 0;
445
446 if (!de->name)
447 return 0;
448
449 if (is_unicode) {
450 __le16 *ufilename = (__le16 *)de->name;
451 if (de->namelen == 2) {
452 /* check for . */
453 if (ufilename[0] == UNICODE_DOT)
454 rc = 1;
455 } else if (de->namelen == 4) {
456 /* check for .. */
457 if (ufilename[0] == UNICODE_DOT &&
458 ufilename[1] == UNICODE_DOT)
459 rc = 2;
460 }
461 } else /* ASCII */ {
462 if (de->namelen == 1) {
463 if (de->name[0] == '.')
464 rc = 1;
465 } else if (de->namelen == 2) {
466 if (de->name[0] == '.' && de->name[1] == '.')
467 rc = 2;
468 }
469 }
470
471 return rc;
472}
473
474/* Check if directory that we are searching has changed so we can decide
475 whether we can use the cached search results from the previous search */
476static int is_dir_changed(struct file *file)
477{
478 struct inode *inode = file->f_path.dentry->d_inode;
479 struct cifsInodeInfo *cifsInfo = CIFS_I(inode);
480
481 if (cifsInfo->time == 0)
482 return 1; /* directory was changed, perhaps due to unlink */
483 else
484 return 0;
485
486}
487
488static int cifs_save_resume_key(const char *current_entry,
489 struct cifsFileInfo *file_info)
490{
491 struct cifs_dirent de;
492 int rc;
493
494 rc = cifs_fill_dirent(&de, current_entry, file_info->srch_inf.info_level,
495 file_info->srch_inf.unicode);
496 if (!rc) {
497 file_info->srch_inf.presume_name = de.name;
498 file_info->srch_inf.resume_name_len = de.namelen;
499 file_info->srch_inf.resume_key = de.resume_key;
500 }
501 return rc;
502}
503
504/* find the corresponding entry in the search */
505/* Note that the SMB server returns search entries for . and .. which
506 complicates logic here if we choose to parse for them and we do not
507 assume that they are located in the findfirst return buffer.*/
508/* We start counting in the buffer with entry 2 and increment for every
509 entry (do not increment for . or .. entry) */
510static int find_cifs_entry(const int xid, struct cifs_tcon *pTcon,
511 struct file *file, char **ppCurrentEntry, int *num_to_ret)
512{
513 __u16 search_flags;
514 int rc = 0;
515 int pos_in_buf = 0;
516 loff_t first_entry_in_buffer;
517 loff_t index_to_find = file->f_pos;
518 struct cifsFileInfo *cifsFile = file->private_data;
519 struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
520 /* check if index in the buffer */
521
522 if ((cifsFile == NULL) || (ppCurrentEntry == NULL) ||
523 (num_to_ret == NULL))
524 return -ENOENT;
525
526 *ppCurrentEntry = NULL;
527 first_entry_in_buffer =
528 cifsFile->srch_inf.index_of_last_entry -
529 cifsFile->srch_inf.entries_in_buffer;
530
531 /* if first entry in buf is zero then is first buffer
532 in search response data which means it is likely . and ..
533 will be in this buffer, although some servers do not return
534 . and .. for the root of a drive and for those we need
535 to start two entries earlier */
536
537 dump_cifs_file_struct(file, "In fce ");
538 if (((index_to_find < cifsFile->srch_inf.index_of_last_entry) &&
539 is_dir_changed(file)) ||
540 (index_to_find < first_entry_in_buffer)) {
541 /* close and restart search */
542 cFYI(1, "search backing up - close and restart search");
543 spin_lock(&cifs_file_list_lock);
544 if (!cifsFile->srch_inf.endOfSearch &&
545 !cifsFile->invalidHandle) {
546 cifsFile->invalidHandle = true;
547 spin_unlock(&cifs_file_list_lock);
548 CIFSFindClose(xid, pTcon, cifsFile->netfid);
549 } else
550 spin_unlock(&cifs_file_list_lock);
551 if (cifsFile->srch_inf.ntwrk_buf_start) {
552 cFYI(1, "freeing SMB ff cache buf on search rewind");
553 if (cifsFile->srch_inf.smallBuf)
554 cifs_small_buf_release(cifsFile->srch_inf.
555 ntwrk_buf_start);
556 else
557 cifs_buf_release(cifsFile->srch_inf.
558 ntwrk_buf_start);
559 cifsFile->srch_inf.ntwrk_buf_start = NULL;
560 }
561 rc = initiate_cifs_search(xid, file);
562 if (rc) {
563 cFYI(1, "error %d reinitiating a search on rewind",
564 rc);
565 return rc;
566 }
567 /* FindFirst/Next set last_entry to NULL on malformed reply */
568 if (cifsFile->srch_inf.last_entry)
569 cifs_save_resume_key(cifsFile->srch_inf.last_entry,
570 cifsFile);
571 }
572
573 search_flags = CIFS_SEARCH_CLOSE_AT_END | CIFS_SEARCH_RETURN_RESUME;
574 if (backup_cred(cifs_sb))
575 search_flags |= CIFS_SEARCH_BACKUP_SEARCH;
576
577 while ((index_to_find >= cifsFile->srch_inf.index_of_last_entry) &&
578 (rc == 0) && !cifsFile->srch_inf.endOfSearch) {
579 cFYI(1, "calling findnext2");
580 rc = CIFSFindNext(xid, pTcon, cifsFile->netfid, search_flags,
581 &cifsFile->srch_inf);
582 /* FindFirst/Next set last_entry to NULL on malformed reply */
583 if (cifsFile->srch_inf.last_entry)
584 cifs_save_resume_key(cifsFile->srch_inf.last_entry,
585 cifsFile);
586 if (rc)
587 return -ENOENT;
588 }
589 if (index_to_find < cifsFile->srch_inf.index_of_last_entry) {
590 /* we found the buffer that contains the entry */
591 /* scan and find it */
592 int i;
593 char *current_entry;
594 char *end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
595 smbCalcSize((struct smb_hdr *)
596 cifsFile->srch_inf.ntwrk_buf_start);
597
598 current_entry = cifsFile->srch_inf.srch_entries_start;
599 first_entry_in_buffer = cifsFile->srch_inf.index_of_last_entry
600 - cifsFile->srch_inf.entries_in_buffer;
601 pos_in_buf = index_to_find - first_entry_in_buffer;
602 cFYI(1, "found entry - pos_in_buf %d", pos_in_buf);
603
604 for (i = 0; (i < (pos_in_buf)) && (current_entry != NULL); i++) {
605 /* go entry by entry figuring out which is first */
606 current_entry = nxt_dir_entry(current_entry, end_of_smb,
607 cifsFile->srch_inf.info_level);
608 }
609 if ((current_entry == NULL) && (i < pos_in_buf)) {
610 /* BB fixme - check if we should flag this error */
611 cERROR(1, "reached end of buf searching for pos in buf"
612 " %d index to find %lld rc %d",
613 pos_in_buf, index_to_find, rc);
614 }
615 rc = 0;
616 *ppCurrentEntry = current_entry;
617 } else {
618 cFYI(1, "index not in buffer - could not findnext into it");
619 return 0;
620 }
621
622 if (pos_in_buf >= cifsFile->srch_inf.entries_in_buffer) {
623 cFYI(1, "can not return entries pos_in_buf beyond last");
624 *num_to_ret = 0;
625 } else
626 *num_to_ret = cifsFile->srch_inf.entries_in_buffer - pos_in_buf;
627
628 return rc;
629}
630
631static int cifs_filldir(char *find_entry, struct file *file, filldir_t filldir,
632 void *dirent, char *scratch_buf, unsigned int max_len)
633{
634 struct cifsFileInfo *file_info = file->private_data;
635 struct super_block *sb = file->f_path.dentry->d_sb;
636 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
637 struct cifs_dirent de = { NULL, };
638 struct cifs_fattr fattr;
639 struct dentry *dentry;
640 struct qstr name;
641 int rc = 0;
642 ino_t ino;
643
644 rc = cifs_fill_dirent(&de, find_entry, file_info->srch_inf.info_level,
645 file_info->srch_inf.unicode);
646 if (rc)
647 return rc;
648
649 if (de.namelen > max_len) {
650 cERROR(1, "bad search response length %zd past smb end",
651 de.namelen);
652 return -EINVAL;
653 }
654
655 /* skip . and .. since we added them first */
656 if (cifs_entry_is_dot(&de, file_info->srch_inf.unicode))
657 return 0;
658
659 if (file_info->srch_inf.unicode) {
660 struct nls_table *nlt = cifs_sb->local_nls;
661
662 name.name = scratch_buf;
663 name.len =
664 cifs_from_utf16((char *)name.name, (__le16 *)de.name,
665 UNICODE_NAME_MAX,
666 min_t(size_t, de.namelen,
667 (size_t)max_len), nlt,
668 cifs_sb->mnt_cifs_flags &
669 CIFS_MOUNT_MAP_SPECIAL_CHR);
670 name.len -= nls_nullsize(nlt);
671 } else {
672 name.name = de.name;
673 name.len = de.namelen;
674 }
675
676 switch (file_info->srch_inf.info_level) {
677 case SMB_FIND_FILE_UNIX:
678 cifs_unix_basic_to_fattr(&fattr,
679 &((FILE_UNIX_INFO *)find_entry)->basic,
680 cifs_sb);
681 break;
682 case SMB_FIND_FILE_INFO_STANDARD:
683 cifs_std_info_to_fattr(&fattr,
684 (FIND_FILE_STANDARD_INFO *)find_entry,
685 cifs_sb);
686 break;
687 default:
688 cifs_dir_info_to_fattr(&fattr,
689 (FILE_DIRECTORY_INFO *)find_entry,
690 cifs_sb);
691 break;
692 }
693
694 if (de.ino && (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
695 fattr.cf_uniqueid = de.ino;
696 } else {
697 fattr.cf_uniqueid = iunique(sb, ROOT_I);
698 cifs_autodisable_serverino(cifs_sb);
699 }
700
701 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) &&
702 CIFSCouldBeMFSymlink(&fattr))
703 /*
704 * trying to get the type and mode can be slow,
705 * so just call those regular files for now, and mark
706 * for reval
707 */
708 fattr.cf_flags |= CIFS_FATTR_NEED_REVAL;
709
710 ino = cifs_uniqueid_to_ino_t(fattr.cf_uniqueid);
711 dentry = cifs_readdir_lookup(file->f_dentry, &name, &fattr);
712
713 rc = filldir(dirent, name.name, name.len, file->f_pos, ino,
714 fattr.cf_dtype);
715
716 dput(dentry);
717 return rc;
718}
719
720
721int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
722{
723 int rc = 0;
724 int xid, i;
725 struct cifs_tcon *pTcon;
726 struct cifsFileInfo *cifsFile = NULL;
727 char *current_entry;
728 int num_to_fill = 0;
729 char *tmp_buf = NULL;
730 char *end_of_smb;
731 unsigned int max_len;
732
733 xid = GetXid();
734
735 /*
736 * Ensure FindFirst doesn't fail before doing filldir() for '.' and
737 * '..'. Otherwise we won't be able to notify VFS in case of failure.
738 */
739 if (file->private_data == NULL) {
740 rc = initiate_cifs_search(xid, file);
741 cFYI(1, "initiate cifs search rc %d", rc);
742 if (rc)
743 goto rddir2_exit;
744 }
745
746 switch ((int) file->f_pos) {
747 case 0:
748 if (filldir(direntry, ".", 1, file->f_pos,
749 file->f_path.dentry->d_inode->i_ino, DT_DIR) < 0) {
750 cERROR(1, "Filldir for current dir failed");
751 rc = -ENOMEM;
752 break;
753 }
754 file->f_pos++;
755 case 1:
756 if (filldir(direntry, "..", 2, file->f_pos,
757 parent_ino(file->f_path.dentry), DT_DIR) < 0) {
758 cERROR(1, "Filldir for parent dir failed");
759 rc = -ENOMEM;
760 break;
761 }
762 file->f_pos++;
763 default:
764 /* 1) If search is active,
765 is in current search buffer?
766 if it before then restart search
767 if after then keep searching till find it */
768
769 if (file->private_data == NULL) {
770 rc = -EINVAL;
771 FreeXid(xid);
772 return rc;
773 }
774 cifsFile = file->private_data;
775 if (cifsFile->srch_inf.endOfSearch) {
776 if (cifsFile->srch_inf.emptyDir) {
777 cFYI(1, "End of search, empty dir");
778 rc = 0;
779 break;
780 }
781 } /* else {
782 cifsFile->invalidHandle = true;
783 CIFSFindClose(xid, pTcon, cifsFile->netfid);
784 } */
785
786 pTcon = tlink_tcon(cifsFile->tlink);
787 rc = find_cifs_entry(xid, pTcon, file,
788 ¤t_entry, &num_to_fill);
789 if (rc) {
790 cFYI(1, "fce error %d", rc);
791 goto rddir2_exit;
792 } else if (current_entry != NULL) {
793 cFYI(1, "entry %lld found", file->f_pos);
794 } else {
795 cFYI(1, "could not find entry");
796 goto rddir2_exit;
797 }
798 cFYI(1, "loop through %d times filling dir for net buf %p",
799 num_to_fill, cifsFile->srch_inf.ntwrk_buf_start);
800 max_len = smbCalcSize((struct smb_hdr *)
801 cifsFile->srch_inf.ntwrk_buf_start);
802 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len;
803
804 tmp_buf = kmalloc(UNICODE_NAME_MAX, GFP_KERNEL);
805 if (tmp_buf == NULL) {
806 rc = -ENOMEM;
807 break;
808 }
809
810 for (i = 0; (i < num_to_fill) && (rc == 0); i++) {
811 if (current_entry == NULL) {
812 /* evaluate whether this case is an error */
813 cERROR(1, "past SMB end, num to fill %d i %d",
814 num_to_fill, i);
815 break;
816 }
817 /* if buggy server returns . and .. late do
818 we want to check for that here? */
819 rc = cifs_filldir(current_entry, file,
820 filldir, direntry, tmp_buf, max_len);
821 if (rc == -EOVERFLOW) {
822 rc = 0;
823 break;
824 }
825
826 file->f_pos++;
827 if (file->f_pos ==
828 cifsFile->srch_inf.index_of_last_entry) {
829 cFYI(1, "last entry in buf at pos %lld %s",
830 file->f_pos, tmp_buf);
831 cifs_save_resume_key(current_entry, cifsFile);
832 break;
833 } else
834 current_entry =
835 nxt_dir_entry(current_entry, end_of_smb,
836 cifsFile->srch_inf.info_level);
837 }
838 kfree(tmp_buf);
839 break;
840 } /* end switch */
841
842rddir2_exit:
843 FreeXid(xid);
844 return rc;
845}