?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
ARM: OMAP: Fix relative includes for shared i2c.h file
[linux-2.6.git] / fs / cifs / readdir.c
blobf9b5d3d6cf33461081f4945d61a5d604fe2ef468
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 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
120 static void
121 cifs_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
154 void
155 cifs_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
170 static void
171 cifs_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 /*
195 int get_symlink_reparse_path(char *full_path, struct cifs_sb_info *cifs_sb,
196 unsigned 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
223 static int
224 initiate_cifs_search(const unsigned int xid, struct file *file)
225 {
226 __u16 search_flags;
227 int rc = 0;
228 char *full_path = NULL;
229 struct cifsFileInfo *cifsFile;
230 struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
231 struct tcon_link *tlink = NULL;
232 struct cifs_tcon *tcon;
233 struct TCP_Server_Info *server;
234
235 if (file->private_data == NULL) {
236 tlink = cifs_sb_tlink(cifs_sb);
237 if (IS_ERR(tlink))
238 return PTR_ERR(tlink);
239
240 cifsFile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
241 if (cifsFile == NULL) {
242 rc = -ENOMEM;
243 goto error_exit;
244 }
245 file->private_data = cifsFile;
246 cifsFile->tlink = cifs_get_tlink(tlink);
247 tcon = tlink_tcon(tlink);
248 } else {
249 cifsFile = file->private_data;
250 tcon = tlink_tcon(cifsFile->tlink);
251 }
252
253 server = tcon->ses->server;
254
255 if (!server->ops->query_dir_first) {
256 rc = -ENOSYS;
257 goto error_exit;
258 }
259
260 cifsFile->invalidHandle = true;
261 cifsFile->srch_inf.endOfSearch = false;
262
263 full_path = build_path_from_dentry(file->f_path.dentry);
264 if (full_path == NULL) {
265 rc = -ENOMEM;
266 goto error_exit;
267 }
268
269 cFYI(1, "Full path: %s start at: %lld", full_path, file->f_pos);
270
271 ffirst_retry:
272 /* test for Unix extensions */
273 /* but now check for them on the share/mount not on the SMB session */
274 /* if (cap_unix(tcon->ses) { */
275 if (tcon->unix_ext)
276 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
277 else if ((tcon->ses->capabilities &
278 tcon->ses->server->vals->cap_nt_find) == 0) {
279 cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD;
280 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
281 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
282 } else /* not srvinos - BB fixme add check for backlevel? */ {
283 cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
284 }
285
286 search_flags = CIFS_SEARCH_CLOSE_AT_END | CIFS_SEARCH_RETURN_RESUME;
287 if (backup_cred(cifs_sb))
288 search_flags |= CIFS_SEARCH_BACKUP_SEARCH;
289
290 rc = server->ops->query_dir_first(xid, tcon, full_path, cifs_sb,
291 &cifsFile->fid, search_flags,
292 &cifsFile->srch_inf);
293
294 if (rc == 0)
295 cifsFile->invalidHandle = false;
296 /* BB add following call to handle readdir on new NTFS symlink errors
297 else if STATUS_STOPPED_ON_SYMLINK
298 call get_symlink_reparse_path and retry with new path */
299 else if ((rc == -EOPNOTSUPP) &&
300 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
301 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
302 goto ffirst_retry;
303 }
304 error_exit:
305 kfree(full_path);
306 cifs_put_tlink(tlink);
307 return rc;
308 }
309
310 /* return length of unicode string in bytes */
311 static int cifs_unicode_bytelen(const char *str)
312 {
313 int len;
314 const __le16 *ustr = (const __le16 *)str;
315
316 for (len = 0; len <= PATH_MAX; len++) {
317 if (ustr[len] == 0)
318 return len << 1;
319 }
320 cFYI(1, "Unicode string longer than PATH_MAX found");
321 return len << 1;
322 }
323
324 static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level)
325 {
326 char *new_entry;
327 FILE_DIRECTORY_INFO *pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
328
329 if (level == SMB_FIND_FILE_INFO_STANDARD) {
330 FIND_FILE_STANDARD_INFO *pfData;
331 pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo;
332
333 new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) +
334 pfData->FileNameLength;
335 } else
336 new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
337 cFYI(1, "new entry %p old entry %p", new_entry, old_entry);
338 /* validate that new_entry is not past end of SMB */
339 if (new_entry >= end_of_smb) {
340 cERROR(1, "search entry %p began after end of SMB %p old entry %p",
341 new_entry, end_of_smb, old_entry);
342 return NULL;
343 } else if (((level == SMB_FIND_FILE_INFO_STANDARD) &&
344 (new_entry + sizeof(FIND_FILE_STANDARD_INFO) > end_of_smb))
345 || ((level != SMB_FIND_FILE_INFO_STANDARD) &&
346 (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb))) {
347 cERROR(1, "search entry %p extends after end of SMB %p",
348 new_entry, end_of_smb);
349 return NULL;
350 } else
351 return new_entry;
352
353 }
354
355 struct cifs_dirent {
356 const char *name;
357 size_t namelen;
358 u32 resume_key;
359 u64 ino;
360 };
361
362 static void cifs_fill_dirent_unix(struct cifs_dirent *de,
363 const FILE_UNIX_INFO *info, bool is_unicode)
364 {
365 de->name = &info->FileName[0];
366 if (is_unicode)
367 de->namelen = cifs_unicode_bytelen(de->name);
368 else
369 de->namelen = strnlen(de->name, PATH_MAX);
370 de->resume_key = info->ResumeKey;
371 de->ino = le64_to_cpu(info->basic.UniqueId);
372 }
373
374 static void cifs_fill_dirent_dir(struct cifs_dirent *de,
375 const FILE_DIRECTORY_INFO *info)
376 {
377 de->name = &info->FileName[0];
378 de->namelen = le32_to_cpu(info->FileNameLength);
379 de->resume_key = info->FileIndex;
380 }
381
382 static void cifs_fill_dirent_full(struct cifs_dirent *de,
383 const FILE_FULL_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_search(struct cifs_dirent *de,
391 const SEARCH_ID_FULL_DIR_INFO *info)
392 {
393 de->name = &info->FileName[0];
394 de->namelen = le32_to_cpu(info->FileNameLength);
395 de->resume_key = info->FileIndex;
396 de->ino = le64_to_cpu(info->UniqueId);
397 }
398
399 static void cifs_fill_dirent_both(struct cifs_dirent *de,
400 const FILE_BOTH_DIRECTORY_INFO *info)
401 {
402 de->name = &info->FileName[0];
403 de->namelen = le32_to_cpu(info->FileNameLength);
404 de->resume_key = info->FileIndex;
405 }
406
407 static void cifs_fill_dirent_std(struct cifs_dirent *de,
408 const FIND_FILE_STANDARD_INFO *info)
409 {
410 de->name = &info->FileName[0];
411 /* one byte length, no endianess conversion */
412 de->namelen = info->FileNameLength;
413 de->resume_key = info->ResumeKey;
414 }
415
416 static int cifs_fill_dirent(struct cifs_dirent *de, const void *info,
417 u16 level, bool is_unicode)
418 {
419 memset(de, 0, sizeof(*de));
420
421 switch (level) {
422 case SMB_FIND_FILE_UNIX:
423 cifs_fill_dirent_unix(de, info, is_unicode);
424 break;
425 case SMB_FIND_FILE_DIRECTORY_INFO:
426 cifs_fill_dirent_dir(de, info);
427 break;
428 case SMB_FIND_FILE_FULL_DIRECTORY_INFO:
429 cifs_fill_dirent_full(de, info);
430 break;
431 case SMB_FIND_FILE_ID_FULL_DIR_INFO:
432 cifs_fill_dirent_search(de, info);
433 break;
434 case SMB_FIND_FILE_BOTH_DIRECTORY_INFO:
435 cifs_fill_dirent_both(de, info);
436 break;
437 case SMB_FIND_FILE_INFO_STANDARD:
438 cifs_fill_dirent_std(de, info);
439 break;
440 default:
441 cFYI(1, "Unknown findfirst level %d", level);
442 return -EINVAL;
443 }
444
445 return 0;
446 }
447
448 #define UNICODE_DOT cpu_to_le16(0x2e)
449
450 /* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
451 static int cifs_entry_is_dot(struct cifs_dirent *de, bool is_unicode)
452 {
453 int rc = 0;
454
455 if (!de->name)
456 return 0;
457
458 if (is_unicode) {
459 __le16 *ufilename = (__le16 *)de->name;
460 if (de->namelen == 2) {
461 /* check for . */
462 if (ufilename[0] == UNICODE_DOT)
463 rc = 1;
464 } else if (de->namelen == 4) {
465 /* check for .. */
466 if (ufilename[0] == UNICODE_DOT &&
467 ufilename[1] == UNICODE_DOT)
468 rc = 2;
469 }
470 } else /* ASCII */ {
471 if (de->namelen == 1) {
472 if (de->name[0] == '.')
473 rc = 1;
474 } else if (de->namelen == 2) {
475 if (de->name[0] == '.' && de->name[1] == '.')
476 rc = 2;
477 }
478 }
479
480 return rc;
481 }
482
483 /* Check if directory that we are searching has changed so we can decide
484 whether we can use the cached search results from the previous search */
485 static int is_dir_changed(struct file *file)
486 {
487 struct inode *inode = file->f_path.dentry->d_inode;
488 struct cifsInodeInfo *cifsInfo = CIFS_I(inode);
489
490 if (cifsInfo->time == 0)
491 return 1; /* directory was changed, perhaps due to unlink */
492 else
493 return 0;
494
495 }
496
497 static int cifs_save_resume_key(const char *current_entry,
498 struct cifsFileInfo *file_info)
499 {
500 struct cifs_dirent de;
501 int rc;
502
503 rc = cifs_fill_dirent(&de, current_entry, file_info->srch_inf.info_level,
504 file_info->srch_inf.unicode);
505 if (!rc) {
506 file_info->srch_inf.presume_name = de.name;
507 file_info->srch_inf.resume_name_len = de.namelen;
508 file_info->srch_inf.resume_key = de.resume_key;
509 }
510 return rc;
511 }
512
513 /*
514 * Find the corresponding entry in the search. Note that the SMB server returns
515 * search entries for . and .. which complicates logic here if we choose to
516 * parse for them and we do not assume that they are located in the findfirst
517 * return buffer. We start counting in the buffer with entry 2 and increment for
518 * every entry (do not increment for . or .. entry).
519 */
520 static int
521 find_cifs_entry(const unsigned int xid, struct cifs_tcon *tcon,
522 struct file *file, char **current_entry, int *num_to_ret)
523 {
524 __u16 search_flags;
525 int rc = 0;
526 int pos_in_buf = 0;
527 loff_t first_entry_in_buffer;
528 loff_t index_to_find = file->f_pos;
529 struct cifsFileInfo *cfile = file->private_data;
530 struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
531 struct TCP_Server_Info *server = tcon->ses->server;
532 /* check if index in the buffer */
533
534 if (!server->ops->query_dir_first || !server->ops->query_dir_next)
535 return -ENOSYS;
536
537 if ((cfile == NULL) || (current_entry == NULL) || (num_to_ret == NULL))
538 return -ENOENT;
539
540 *current_entry = NULL;
541 first_entry_in_buffer = cfile->srch_inf.index_of_last_entry -
542 cfile->srch_inf.entries_in_buffer;
543
544 /*
545 * If first entry in buf is zero then is first buffer
546 * in search response data which means it is likely . and ..
547 * will be in this buffer, although some servers do not return
548 * . and .. for the root of a drive and for those we need
549 * to start two entries earlier.
550 */
551
552 dump_cifs_file_struct(file, "In fce ");
553 if (((index_to_find < cfile->srch_inf.index_of_last_entry) &&
554 is_dir_changed(file)) || (index_to_find < first_entry_in_buffer)) {
555 /* close and restart search */
556 cFYI(1, "search backing up - close and restart search");
557 spin_lock(&cifs_file_list_lock);
558 if (!cfile->srch_inf.endOfSearch && !cfile->invalidHandle) {
559 cfile->invalidHandle = true;
560 spin_unlock(&cifs_file_list_lock);
561 if (server->ops->close)
562 server->ops->close(xid, tcon, &cfile->fid);
563 } else
564 spin_unlock(&cifs_file_list_lock);
565 if (cfile->srch_inf.ntwrk_buf_start) {
566 cFYI(1, "freeing SMB ff cache buf on search rewind");
567 if (cfile->srch_inf.smallBuf)
568 cifs_small_buf_release(cfile->srch_inf.
569 ntwrk_buf_start);
570 else
571 cifs_buf_release(cfile->srch_inf.
572 ntwrk_buf_start);
573 cfile->srch_inf.ntwrk_buf_start = NULL;
574 }
575 rc = initiate_cifs_search(xid, file);
576 if (rc) {
577 cFYI(1, "error %d reinitiating a search on rewind",
578 rc);
579 return rc;
580 }
581 /* FindFirst/Next set last_entry to NULL on malformed reply */
582 if (cfile->srch_inf.last_entry)
583 cifs_save_resume_key(cfile->srch_inf.last_entry, cfile);
584 }
585
586 search_flags = CIFS_SEARCH_CLOSE_AT_END | CIFS_SEARCH_RETURN_RESUME;
587 if (backup_cred(cifs_sb))
588 search_flags |= CIFS_SEARCH_BACKUP_SEARCH;
589
590 while ((index_to_find >= cfile->srch_inf.index_of_last_entry) &&
591 (rc == 0) && !cfile->srch_inf.endOfSearch) {
592 cFYI(1, "calling findnext2");
593 rc = server->ops->query_dir_next(xid, tcon, &cfile->fid,
594 search_flags,
595 &cfile->srch_inf);
596 /* FindFirst/Next set last_entry to NULL on malformed reply */
597 if (cfile->srch_inf.last_entry)
598 cifs_save_resume_key(cfile->srch_inf.last_entry, cfile);
599 if (rc)
600 return -ENOENT;
601 }
602 if (index_to_find < cfile->srch_inf.index_of_last_entry) {
603 /* we found the buffer that contains the entry */
604 /* scan and find it */
605 int i;
606 char *cur_ent;
607 char *end_of_smb = cfile->srch_inf.ntwrk_buf_start +
608 server->ops->calc_smb_size(
609 cfile->srch_inf.ntwrk_buf_start);
610
611 cur_ent = cfile->srch_inf.srch_entries_start;
612 first_entry_in_buffer = cfile->srch_inf.index_of_last_entry
613 - cfile->srch_inf.entries_in_buffer;
614 pos_in_buf = index_to_find - first_entry_in_buffer;
615 cFYI(1, "found entry - pos_in_buf %d", pos_in_buf);
616
617 for (i = 0; (i < (pos_in_buf)) && (cur_ent != NULL); i++) {
618 /* go entry by entry figuring out which is first */
619 cur_ent = nxt_dir_entry(cur_ent, end_of_smb,
620 cfile->srch_inf.info_level);
621 }
622 if ((cur_ent == NULL) && (i < pos_in_buf)) {
623 /* BB fixme - check if we should flag this error */
624 cERROR(1, "reached end of buf searching for pos in buf"
625 " %d index to find %lld rc %d", pos_in_buf,
626 index_to_find, rc);
627 }
628 rc = 0;
629 *current_entry = cur_ent;
630 } else {
631 cFYI(1, "index not in buffer - could not findnext into it");
632 return 0;
633 }
634
635 if (pos_in_buf >= cfile->srch_inf.entries_in_buffer) {
636 cFYI(1, "can not return entries pos_in_buf beyond last");
637 *num_to_ret = 0;
638 } else
639 *num_to_ret = cfile->srch_inf.entries_in_buffer - pos_in_buf;
640
641 return rc;
642 }
643
644 static int cifs_filldir(char *find_entry, struct file *file, filldir_t filldir,
645 void *dirent, char *scratch_buf, unsigned int max_len)
646 {
647 struct cifsFileInfo *file_info = file->private_data;
648 struct super_block *sb = file->f_path.dentry->d_sb;
649 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
650 struct cifs_dirent de = { NULL, };
651 struct cifs_fattr fattr;
652 struct dentry *dentry;
653 struct qstr name;
654 int rc = 0;
655 ino_t ino;
656
657 rc = cifs_fill_dirent(&de, find_entry, file_info->srch_inf.info_level,
658 file_info->srch_inf.unicode);
659 if (rc)
660 return rc;
661
662 if (de.namelen > max_len) {
663 cERROR(1, "bad search response length %zd past smb end",
664 de.namelen);
665 return -EINVAL;
666 }
667
668 /* skip . and .. since we added them first */
669 if (cifs_entry_is_dot(&de, file_info->srch_inf.unicode))
670 return 0;
671
672 if (file_info->srch_inf.unicode) {
673 struct nls_table *nlt = cifs_sb->local_nls;
674
675 name.name = scratch_buf;
676 name.len =
677 cifs_from_utf16((char *)name.name, (__le16 *)de.name,
678 UNICODE_NAME_MAX,
679 min_t(size_t, de.namelen,
680 (size_t)max_len), nlt,
681 cifs_sb->mnt_cifs_flags &
682 CIFS_MOUNT_MAP_SPECIAL_CHR);
683 name.len -= nls_nullsize(nlt);
684 } else {
685 name.name = de.name;
686 name.len = de.namelen;
687 }
688
689 switch (file_info->srch_inf.info_level) {
690 case SMB_FIND_FILE_UNIX:
691 cifs_unix_basic_to_fattr(&fattr,
692 &((FILE_UNIX_INFO *)find_entry)->basic,
693 cifs_sb);
694 break;
695 case SMB_FIND_FILE_INFO_STANDARD:
696 cifs_std_info_to_fattr(&fattr,
697 (FIND_FILE_STANDARD_INFO *)find_entry,
698 cifs_sb);
699 break;
700 default:
701 cifs_dir_info_to_fattr(&fattr,
702 (FILE_DIRECTORY_INFO *)find_entry,
703 cifs_sb);
704 break;
705 }
706
707 if (de.ino && (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
708 fattr.cf_uniqueid = de.ino;
709 } else {
710 fattr.cf_uniqueid = iunique(sb, ROOT_I);
711 cifs_autodisable_serverino(cifs_sb);
712 }
713
714 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) &&
715 CIFSCouldBeMFSymlink(&fattr))
716 /*
717 * trying to get the type and mode can be slow,
718 * so just call those regular files for now, and mark
719 * for reval
720 */
721 fattr.cf_flags |= CIFS_FATTR_NEED_REVAL;
722
723 ino = cifs_uniqueid_to_ino_t(fattr.cf_uniqueid);
724 dentry = cifs_readdir_lookup(file->f_dentry, &name, &fattr);
725
726 rc = filldir(dirent, name.name, name.len, file->f_pos, ino,
727 fattr.cf_dtype);
728
729 dput(dentry);
730 return rc;
731 }
732
733
734 int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
735 {
736 int rc = 0;
737 unsigned int xid;
738 int i;
739 struct cifs_tcon *tcon;
740 struct cifsFileInfo *cifsFile = NULL;
741 char *current_entry;
742 int num_to_fill = 0;
743 char *tmp_buf = NULL;
744 char *end_of_smb;
745 unsigned int max_len;
746
747 xid = get_xid();
748
749 /*
750 * Ensure FindFirst doesn't fail before doing filldir() for '.' and
751 * '..'. Otherwise we won't be able to notify VFS in case of failure.
752 */
753 if (file->private_data == NULL) {
754 rc = initiate_cifs_search(xid, file);
755 cFYI(1, "initiate cifs search rc %d", rc);
756 if (rc)
757 goto rddir2_exit;
758 }
759
760 switch ((int) file->f_pos) {
761 case 0:
762 if (filldir(direntry, ".", 1, file->f_pos,
763 file->f_path.dentry->d_inode->i_ino, DT_DIR) < 0) {
764 cERROR(1, "Filldir for current dir failed");
765 rc = -ENOMEM;
766 break;
767 }
768 file->f_pos++;
769 case 1:
770 if (filldir(direntry, "..", 2, file->f_pos,
771 parent_ino(file->f_path.dentry), DT_DIR) < 0) {
772 cERROR(1, "Filldir for parent dir failed");
773 rc = -ENOMEM;
774 break;
775 }
776 file->f_pos++;
777 default:
778 /* 1) If search is active,
779 is in current search buffer?
780 if it before then restart search
781 if after then keep searching till find it */
782
783 if (file->private_data == NULL) {
784 rc = -EINVAL;
785 free_xid(xid);
786 return rc;
787 }
788 cifsFile = file->private_data;
789 if (cifsFile->srch_inf.endOfSearch) {
790 if (cifsFile->srch_inf.emptyDir) {
791 cFYI(1, "End of search, empty dir");
792 rc = 0;
793 break;
794 }
795 } /* else {
796 cifsFile->invalidHandle = true;
797 tcon->ses->server->close(xid, tcon, &cifsFile->fid);
798 } */
799
800 tcon = tlink_tcon(cifsFile->tlink);
801 rc = find_cifs_entry(xid, tcon, file, &current_entry,
802 &num_to_fill);
803 if (rc) {
804 cFYI(1, "fce error %d", rc);
805 goto rddir2_exit;
806 } else if (current_entry != NULL) {
807 cFYI(1, "entry %lld found", file->f_pos);
808 } else {
809 cFYI(1, "could not find entry");
810 goto rddir2_exit;
811 }
812 cFYI(1, "loop through %d times filling dir for net buf %p",
813 num_to_fill, cifsFile->srch_inf.ntwrk_buf_start);
814 max_len = tcon->ses->server->ops->calc_smb_size(
815 cifsFile->srch_inf.ntwrk_buf_start);
816 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len;
817
818 tmp_buf = kmalloc(UNICODE_NAME_MAX, GFP_KERNEL);
819 if (tmp_buf == NULL) {
820 rc = -ENOMEM;
821 break;
822 }
823
824 for (i = 0; (i < num_to_fill) && (rc == 0); i++) {
825 if (current_entry == NULL) {
826 /* evaluate whether this case is an error */
827 cERROR(1, "past SMB end, num to fill %d i %d",
828 num_to_fill, i);
829 break;
830 }
831 /*
832 * if buggy server returns . and .. late do we want to
833 * check for that here?
834 */
835 rc = cifs_filldir(current_entry, file, filldir,
836 direntry, tmp_buf, max_len);
837 if (rc == -EOVERFLOW) {
838 rc = 0;
839 break;
840 }
841
842 file->f_pos++;
843 if (file->f_pos ==
844 cifsFile->srch_inf.index_of_last_entry) {
845 cFYI(1, "last entry in buf at pos %lld %s",
846 file->f_pos, tmp_buf);
847 cifs_save_resume_key(current_entry, cifsFile);
848 break;
849 } else
850 current_entry =
851 nxt_dir_entry(current_entry, end_of_smb,
852 cifsFile->srch_inf.info_level);
853 }
854 kfree(tmp_buf);
855 break;
856 } /* end switch */
857
858 rddir2_exit:
859 free_xid(xid);
860 return rc;
861 }
Linus' kernel tree