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Merge branch 'for_3.8-rc1' into v4l_for_linus
[deliverable/linux.git] / fs / cifs / readdir.c
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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 int err;
90 inode = dentry->d_inode;
91 /* update inode in place if i_ino didn't change */
92 if (inode && CIFS_I(inode)->uniqueid == fattr->cf_uniqueid) {
93 cifs_fattr_to_inode(inode, fattr);
94 return dentry;
95 }
96 err = d_invalidate(dentry);
97 dput(dentry);
98 if (err)
99 return NULL;
100 }
101
102 dentry = d_alloc(parent, name);
103 if (dentry == NULL)
104 return NULL;
105
106 inode = cifs_iget(sb, fattr);
107 if (!inode) {
108 dput(dentry);
109 return NULL;
110 }
111
112 alias = d_materialise_unique(dentry, inode);
113 if (alias != NULL) {
114 dput(dentry);
115 if (IS_ERR(alias))
116 return NULL;
117 dentry = alias;
118 }
119
120 return dentry;
121}
122
123static void
124cifs_fill_common_info(struct cifs_fattr *fattr, struct cifs_sb_info *cifs_sb)
125{
126 fattr->cf_uid = cifs_sb->mnt_uid;
127 fattr->cf_gid = cifs_sb->mnt_gid;
128
129 if (fattr->cf_cifsattrs & ATTR_DIRECTORY) {
130 fattr->cf_mode = S_IFDIR | cifs_sb->mnt_dir_mode;
131 fattr->cf_dtype = DT_DIR;
132 } else {
133 fattr->cf_mode = S_IFREG | cifs_sb->mnt_file_mode;
134 fattr->cf_dtype = DT_REG;
135 }
136
137 if (fattr->cf_cifsattrs & ATTR_READONLY)
138 fattr->cf_mode &= ~S_IWUGO;
139
140 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL &&
141 fattr->cf_cifsattrs & ATTR_SYSTEM) {
142 if (fattr->cf_eof == 0) {
143 fattr->cf_mode &= ~S_IFMT;
144 fattr->cf_mode |= S_IFIFO;
145 fattr->cf_dtype = DT_FIFO;
146 } else {
147 /*
148 * trying to get the type and mode via SFU can be slow,
149 * so just call those regular files for now, and mark
150 * for reval
151 */
152 fattr->cf_flags |= CIFS_FATTR_NEED_REVAL;
153 }
154 }
155}
156
157void
158cifs_dir_info_to_fattr(struct cifs_fattr *fattr, FILE_DIRECTORY_INFO *info,
159 struct cifs_sb_info *cifs_sb)
160{
161 memset(fattr, 0, sizeof(*fattr));
162 fattr->cf_cifsattrs = le32_to_cpu(info->ExtFileAttributes);
163 fattr->cf_eof = le64_to_cpu(info->EndOfFile);
164 fattr->cf_bytes = le64_to_cpu(info->AllocationSize);
165 fattr->cf_createtime = le64_to_cpu(info->CreationTime);
166 fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
167 fattr->cf_ctime = cifs_NTtimeToUnix(info->ChangeTime);
168 fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime);
169
170 cifs_fill_common_info(fattr, cifs_sb);
171}
172
173static void
174cifs_std_info_to_fattr(struct cifs_fattr *fattr, FIND_FILE_STANDARD_INFO *info,
175 struct cifs_sb_info *cifs_sb)
176{
177 int offset = cifs_sb_master_tcon(cifs_sb)->ses->server->timeAdj;
178
179 memset(fattr, 0, sizeof(*fattr));
180 fattr->cf_atime = cnvrtDosUnixTm(info->LastAccessDate,
181 info->LastAccessTime, offset);
182 fattr->cf_ctime = cnvrtDosUnixTm(info->LastWriteDate,
183 info->LastWriteTime, offset);
184 fattr->cf_mtime = cnvrtDosUnixTm(info->LastWriteDate,
185 info->LastWriteTime, offset);
186
187 fattr->cf_cifsattrs = le16_to_cpu(info->Attributes);
188 fattr->cf_bytes = le32_to_cpu(info->AllocationSize);
189 fattr->cf_eof = le32_to_cpu(info->DataSize);
190
191 cifs_fill_common_info(fattr, cifs_sb);
192}
193
194/* BB eventually need to add the following helper function to
195 resolve NT_STATUS_STOPPED_ON_SYMLINK return code when
196 we try to do FindFirst on (NTFS) directory symlinks */
197/*
198int get_symlink_reparse_path(char *full_path, struct cifs_sb_info *cifs_sb,
199 unsigned int xid)
200{
201 __u16 fid;
202 int len;
203 int oplock = 0;
204 int rc;
205 struct cifs_tcon *ptcon = cifs_sb_tcon(cifs_sb);
206 char *tmpbuffer;
207
208 rc = CIFSSMBOpen(xid, ptcon, full_path, FILE_OPEN, GENERIC_READ,
209 OPEN_REPARSE_POINT, &fid, &oplock, NULL,
210 cifs_sb->local_nls,
211 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
212 if (!rc) {
213 tmpbuffer = kmalloc(maxpath);
214 rc = CIFSSMBQueryReparseLinkInfo(xid, ptcon, full_path,
215 tmpbuffer,
216 maxpath -1,
217 fid,
218 cifs_sb->local_nls);
219 if (CIFSSMBClose(xid, ptcon, fid)) {
220 cFYI(1, "Error closing temporary reparsepoint open");
221 }
222 }
223}
224 */
225
226static int
227initiate_cifs_search(const unsigned int xid, struct file *file)
228{
229 __u16 search_flags;
230 int rc = 0;
231 char *full_path = NULL;
232 struct cifsFileInfo *cifsFile;
233 struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
234 struct tcon_link *tlink = NULL;
235 struct cifs_tcon *tcon;
236 struct TCP_Server_Info *server;
237
238 if (file->private_data == NULL) {
239 tlink = cifs_sb_tlink(cifs_sb);
240 if (IS_ERR(tlink))
241 return PTR_ERR(tlink);
242
243 cifsFile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
244 if (cifsFile == NULL) {
245 rc = -ENOMEM;
246 goto error_exit;
247 }
248 file->private_data = cifsFile;
249 cifsFile->tlink = cifs_get_tlink(tlink);
250 tcon = tlink_tcon(tlink);
251 } else {
252 cifsFile = file->private_data;
253 tcon = tlink_tcon(cifsFile->tlink);
254 }
255
256 server = tcon->ses->server;
257
258 if (!server->ops->query_dir_first) {
259 rc = -ENOSYS;
260 goto error_exit;
261 }
262
263 cifsFile->invalidHandle = true;
264 cifsFile->srch_inf.endOfSearch = false;
265
266 full_path = build_path_from_dentry(file->f_path.dentry);
267 if (full_path == NULL) {
268 rc = -ENOMEM;
269 goto error_exit;
270 }
271
272 cFYI(1, "Full path: %s start at: %lld", full_path, file->f_pos);
273
274ffirst_retry:
275 /* test for Unix extensions */
276 /* but now check for them on the share/mount not on the SMB session */
277 /* if (cap_unix(tcon->ses) { */
278 if (tcon->unix_ext)
279 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
280 else if ((tcon->ses->capabilities &
281 tcon->ses->server->vals->cap_nt_find) == 0) {
282 cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD;
283 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
284 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
285 } else /* not srvinos - BB fixme add check for backlevel? */ {
286 cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
287 }
288
289 search_flags = CIFS_SEARCH_CLOSE_AT_END | CIFS_SEARCH_RETURN_RESUME;
290 if (backup_cred(cifs_sb))
291 search_flags |= CIFS_SEARCH_BACKUP_SEARCH;
292
293 rc = server->ops->query_dir_first(xid, tcon, full_path, cifs_sb,
294 &cifsFile->fid, search_flags,
295 &cifsFile->srch_inf);
296
297 if (rc == 0)
298 cifsFile->invalidHandle = false;
299 /* BB add following call to handle readdir on new NTFS symlink errors
300 else if STATUS_STOPPED_ON_SYMLINK
301 call get_symlink_reparse_path and retry with new path */
302 else if ((rc == -EOPNOTSUPP) &&
303 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
304 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
305 goto ffirst_retry;
306 }
307error_exit:
308 kfree(full_path);
309 cifs_put_tlink(tlink);
310 return rc;
311}
312
313/* return length of unicode string in bytes */
314static int cifs_unicode_bytelen(const char *str)
315{
316 int len;
317 const __le16 *ustr = (const __le16 *)str;
318
319 for (len = 0; len <= PATH_MAX; len++) {
320 if (ustr[len] == 0)
321 return len << 1;
322 }
323 cFYI(1, "Unicode string longer than PATH_MAX found");
324 return len << 1;
325}
326
327static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level)
328{
329 char *new_entry;
330 FILE_DIRECTORY_INFO *pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
331
332 if (level == SMB_FIND_FILE_INFO_STANDARD) {
333 FIND_FILE_STANDARD_INFO *pfData;
334 pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo;
335
336 new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) +
337 pfData->FileNameLength;
338 } else
339 new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
340 cFYI(1, "new entry %p old entry %p", new_entry, old_entry);
341 /* validate that new_entry is not past end of SMB */
342 if (new_entry >= end_of_smb) {
343 cERROR(1, "search entry %p began after end of SMB %p old entry %p",
344 new_entry, end_of_smb, old_entry);
345 return NULL;
346 } else if (((level == SMB_FIND_FILE_INFO_STANDARD) &&
347 (new_entry + sizeof(FIND_FILE_STANDARD_INFO) > end_of_smb))
348 || ((level != SMB_FIND_FILE_INFO_STANDARD) &&
349 (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb))) {
350 cERROR(1, "search entry %p extends after end of SMB %p",
351 new_entry, end_of_smb);
352 return NULL;
353 } else
354 return new_entry;
355
356}
357
358struct cifs_dirent {
359 const char *name;
360 size_t namelen;
361 u32 resume_key;
362 u64 ino;
363};
364
365static void cifs_fill_dirent_unix(struct cifs_dirent *de,
366 const FILE_UNIX_INFO *info, bool is_unicode)
367{
368 de->name = &info->FileName[0];
369 if (is_unicode)
370 de->namelen = cifs_unicode_bytelen(de->name);
371 else
372 de->namelen = strnlen(de->name, PATH_MAX);
373 de->resume_key = info->ResumeKey;
374 de->ino = le64_to_cpu(info->basic.UniqueId);
375}
376
377static void cifs_fill_dirent_dir(struct cifs_dirent *de,
378 const FILE_DIRECTORY_INFO *info)
379{
380 de->name = &info->FileName[0];
381 de->namelen = le32_to_cpu(info->FileNameLength);
382 de->resume_key = info->FileIndex;
383}
384
385static void cifs_fill_dirent_full(struct cifs_dirent *de,
386 const FILE_FULL_DIRECTORY_INFO *info)
387{
388 de->name = &info->FileName[0];
389 de->namelen = le32_to_cpu(info->FileNameLength);
390 de->resume_key = info->FileIndex;
391}
392
393static void cifs_fill_dirent_search(struct cifs_dirent *de,
394 const SEARCH_ID_FULL_DIR_INFO *info)
395{
396 de->name = &info->FileName[0];
397 de->namelen = le32_to_cpu(info->FileNameLength);
398 de->resume_key = info->FileIndex;
399 de->ino = le64_to_cpu(info->UniqueId);
400}
401
402static void cifs_fill_dirent_both(struct cifs_dirent *de,
403 const FILE_BOTH_DIRECTORY_INFO *info)
404{
405 de->name = &info->FileName[0];
406 de->namelen = le32_to_cpu(info->FileNameLength);
407 de->resume_key = info->FileIndex;
408}
409
410static void cifs_fill_dirent_std(struct cifs_dirent *de,
411 const FIND_FILE_STANDARD_INFO *info)
412{
413 de->name = &info->FileName[0];
414 /* one byte length, no endianess conversion */
415 de->namelen = info->FileNameLength;
416 de->resume_key = info->ResumeKey;
417}
418
419static int cifs_fill_dirent(struct cifs_dirent *de, const void *info,
420 u16 level, bool is_unicode)
421{
422 memset(de, 0, sizeof(*de));
423
424 switch (level) {
425 case SMB_FIND_FILE_UNIX:
426 cifs_fill_dirent_unix(de, info, is_unicode);
427 break;
428 case SMB_FIND_FILE_DIRECTORY_INFO:
429 cifs_fill_dirent_dir(de, info);
430 break;
431 case SMB_FIND_FILE_FULL_DIRECTORY_INFO:
432 cifs_fill_dirent_full(de, info);
433 break;
434 case SMB_FIND_FILE_ID_FULL_DIR_INFO:
435 cifs_fill_dirent_search(de, info);
436 break;
437 case SMB_FIND_FILE_BOTH_DIRECTORY_INFO:
438 cifs_fill_dirent_both(de, info);
439 break;
440 case SMB_FIND_FILE_INFO_STANDARD:
441 cifs_fill_dirent_std(de, info);
442 break;
443 default:
444 cFYI(1, "Unknown findfirst level %d", level);
445 return -EINVAL;
446 }
447
448 return 0;
449}
450
451#define UNICODE_DOT cpu_to_le16(0x2e)
452
453/* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
454static int cifs_entry_is_dot(struct cifs_dirent *de, bool is_unicode)
455{
456 int rc = 0;
457
458 if (!de->name)
459 return 0;
460
461 if (is_unicode) {
462 __le16 *ufilename = (__le16 *)de->name;
463 if (de->namelen == 2) {
464 /* check for . */
465 if (ufilename[0] == UNICODE_DOT)
466 rc = 1;
467 } else if (de->namelen == 4) {
468 /* check for .. */
469 if (ufilename[0] == UNICODE_DOT &&
470 ufilename[1] == UNICODE_DOT)
471 rc = 2;
472 }
473 } else /* ASCII */ {
474 if (de->namelen == 1) {
475 if (de->name[0] == '.')
476 rc = 1;
477 } else if (de->namelen == 2) {
478 if (de->name[0] == '.' && de->name[1] == '.')
479 rc = 2;
480 }
481 }
482
483 return rc;
484}
485
486/* Check if directory that we are searching has changed so we can decide
487 whether we can use the cached search results from the previous search */
488static int is_dir_changed(struct file *file)
489{
490 struct inode *inode = file->f_path.dentry->d_inode;
491 struct cifsInodeInfo *cifsInfo = CIFS_I(inode);
492
493 if (cifsInfo->time == 0)
494 return 1; /* directory was changed, perhaps due to unlink */
495 else
496 return 0;
497
498}
499
500static int cifs_save_resume_key(const char *current_entry,
501 struct cifsFileInfo *file_info)
502{
503 struct cifs_dirent de;
504 int rc;
505
506 rc = cifs_fill_dirent(&de, current_entry, file_info->srch_inf.info_level,
507 file_info->srch_inf.unicode);
508 if (!rc) {
509 file_info->srch_inf.presume_name = de.name;
510 file_info->srch_inf.resume_name_len = de.namelen;
511 file_info->srch_inf.resume_key = de.resume_key;
512 }
513 return rc;
514}
515
516/*
517 * Find the corresponding entry in the search. Note that the SMB server returns
518 * search entries for . and .. which complicates logic here if we choose to
519 * parse for them and we do not assume that they are located in the findfirst
520 * return buffer. We start counting in the buffer with entry 2 and increment for
521 * every entry (do not increment for . or .. entry).
522 */
523static int
524find_cifs_entry(const unsigned int xid, struct cifs_tcon *tcon,
525 struct file *file, char **current_entry, int *num_to_ret)
526{
527 __u16 search_flags;
528 int rc = 0;
529 int pos_in_buf = 0;
530 loff_t first_entry_in_buffer;
531 loff_t index_to_find = file->f_pos;
532 struct cifsFileInfo *cfile = file->private_data;
533 struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
534 struct TCP_Server_Info *server = tcon->ses->server;
535 /* check if index in the buffer */
536
537 if (!server->ops->query_dir_first || !server->ops->query_dir_next)
538 return -ENOSYS;
539
540 if ((cfile == NULL) || (current_entry == NULL) || (num_to_ret == NULL))
541 return -ENOENT;
542
543 *current_entry = NULL;
544 first_entry_in_buffer = cfile->srch_inf.index_of_last_entry -
545 cfile->srch_inf.entries_in_buffer;
546
547 /*
548 * If first entry in buf is zero then is first buffer
549 * in search response data which means it is likely . and ..
550 * will be in this buffer, although some servers do not return
551 * . and .. for the root of a drive and for those we need
552 * to start two entries earlier.
553 */
554
555 dump_cifs_file_struct(file, "In fce ");
556 if (((index_to_find < cfile->srch_inf.index_of_last_entry) &&
557 is_dir_changed(file)) || (index_to_find < first_entry_in_buffer)) {
558 /* close and restart search */
559 cFYI(1, "search backing up - close and restart search");
560 spin_lock(&cifs_file_list_lock);
561 if (!cfile->srch_inf.endOfSearch && !cfile->invalidHandle) {
562 cfile->invalidHandle = true;
563 spin_unlock(&cifs_file_list_lock);
564 if (server->ops->close)
565 server->ops->close(xid, tcon, &cfile->fid);
566 } else
567 spin_unlock(&cifs_file_list_lock);
568 if (cfile->srch_inf.ntwrk_buf_start) {
569 cFYI(1, "freeing SMB ff cache buf on search rewind");
570 if (cfile->srch_inf.smallBuf)
571 cifs_small_buf_release(cfile->srch_inf.
572 ntwrk_buf_start);
573 else
574 cifs_buf_release(cfile->srch_inf.
575 ntwrk_buf_start);
576 cfile->srch_inf.ntwrk_buf_start = NULL;
577 }
578 rc = initiate_cifs_search(xid, file);
579 if (rc) {
580 cFYI(1, "error %d reinitiating a search on rewind",
581 rc);
582 return rc;
583 }
584 /* FindFirst/Next set last_entry to NULL on malformed reply */
585 if (cfile->srch_inf.last_entry)
586 cifs_save_resume_key(cfile->srch_inf.last_entry, cfile);
587 }
588
589 search_flags = CIFS_SEARCH_CLOSE_AT_END | CIFS_SEARCH_RETURN_RESUME;
590 if (backup_cred(cifs_sb))
591 search_flags |= CIFS_SEARCH_BACKUP_SEARCH;
592
593 while ((index_to_find >= cfile->srch_inf.index_of_last_entry) &&
594 (rc == 0) && !cfile->srch_inf.endOfSearch) {
595 cFYI(1, "calling findnext2");
596 rc = server->ops->query_dir_next(xid, tcon, &cfile->fid,
597 search_flags,
598 &cfile->srch_inf);
599 /* FindFirst/Next set last_entry to NULL on malformed reply */
600 if (cfile->srch_inf.last_entry)
601 cifs_save_resume_key(cfile->srch_inf.last_entry, cfile);
602 if (rc)
603 return -ENOENT;
604 }
605 if (index_to_find < cfile->srch_inf.index_of_last_entry) {
606 /* we found the buffer that contains the entry */
607 /* scan and find it */
608 int i;
609 char *cur_ent;
610 char *end_of_smb = cfile->srch_inf.ntwrk_buf_start +
611 server->ops->calc_smb_size(
612 cfile->srch_inf.ntwrk_buf_start);
613
614 cur_ent = cfile->srch_inf.srch_entries_start;
615 first_entry_in_buffer = cfile->srch_inf.index_of_last_entry
616 - cfile->srch_inf.entries_in_buffer;
617 pos_in_buf = index_to_find - first_entry_in_buffer;
618 cFYI(1, "found entry - pos_in_buf %d", pos_in_buf);
619
620 for (i = 0; (i < (pos_in_buf)) && (cur_ent != NULL); i++) {
621 /* go entry by entry figuring out which is first */
622 cur_ent = nxt_dir_entry(cur_ent, end_of_smb,
623 cfile->srch_inf.info_level);
624 }
625 if ((cur_ent == NULL) && (i < pos_in_buf)) {
626 /* BB fixme - check if we should flag this error */
627 cERROR(1, "reached end of buf searching for pos in buf"
628 " %d index to find %lld rc %d", pos_in_buf,
629 index_to_find, rc);
630 }
631 rc = 0;
632 *current_entry = cur_ent;
633 } else {
634 cFYI(1, "index not in buffer - could not findnext into it");
635 return 0;
636 }
637
638 if (pos_in_buf >= cfile->srch_inf.entries_in_buffer) {
639 cFYI(1, "can not return entries pos_in_buf beyond last");
640 *num_to_ret = 0;
641 } else
642 *num_to_ret = cfile->srch_inf.entries_in_buffer - pos_in_buf;
643
644 return rc;
645}
646
647static int cifs_filldir(char *find_entry, struct file *file, filldir_t filldir,
648 void *dirent, char *scratch_buf, unsigned int max_len)
649{
650 struct cifsFileInfo *file_info = file->private_data;
651 struct super_block *sb = file->f_path.dentry->d_sb;
652 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
653 struct cifs_dirent de = { NULL, };
654 struct cifs_fattr fattr;
655 struct dentry *dentry;
656 struct qstr name;
657 int rc = 0;
658 ino_t ino;
659
660 rc = cifs_fill_dirent(&de, find_entry, file_info->srch_inf.info_level,
661 file_info->srch_inf.unicode);
662 if (rc)
663 return rc;
664
665 if (de.namelen > max_len) {
666 cERROR(1, "bad search response length %zd past smb end",
667 de.namelen);
668 return -EINVAL;
669 }
670
671 /* skip . and .. since we added them first */
672 if (cifs_entry_is_dot(&de, file_info->srch_inf.unicode))
673 return 0;
674
675 if (file_info->srch_inf.unicode) {
676 struct nls_table *nlt = cifs_sb->local_nls;
677
678 name.name = scratch_buf;
679 name.len =
680 cifs_from_utf16((char *)name.name, (__le16 *)de.name,
681 UNICODE_NAME_MAX,
682 min_t(size_t, de.namelen,
683 (size_t)max_len), nlt,
684 cifs_sb->mnt_cifs_flags &
685 CIFS_MOUNT_MAP_SPECIAL_CHR);
686 name.len -= nls_nullsize(nlt);
687 } else {
688 name.name = de.name;
689 name.len = de.namelen;
690 }
691
692 switch (file_info->srch_inf.info_level) {
693 case SMB_FIND_FILE_UNIX:
694 cifs_unix_basic_to_fattr(&fattr,
695 &((FILE_UNIX_INFO *)find_entry)->basic,
696 cifs_sb);
697 break;
698 case SMB_FIND_FILE_INFO_STANDARD:
699 cifs_std_info_to_fattr(&fattr,
700 (FIND_FILE_STANDARD_INFO *)find_entry,
701 cifs_sb);
702 break;
703 default:
704 cifs_dir_info_to_fattr(&fattr,
705 (FILE_DIRECTORY_INFO *)find_entry,
706 cifs_sb);
707 break;
708 }
709
710 if (de.ino && (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
711 fattr.cf_uniqueid = de.ino;
712 } else {
713 fattr.cf_uniqueid = iunique(sb, ROOT_I);
714 cifs_autodisable_serverino(cifs_sb);
715 }
716
717 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) &&
718 CIFSCouldBeMFSymlink(&fattr))
719 /*
720 * trying to get the type and mode can be slow,
721 * so just call those regular files for now, and mark
722 * for reval
723 */
724 fattr.cf_flags |= CIFS_FATTR_NEED_REVAL;
725
726 ino = cifs_uniqueid_to_ino_t(fattr.cf_uniqueid);
727 dentry = cifs_readdir_lookup(file->f_dentry, &name, &fattr);
728
729 rc = filldir(dirent, name.name, name.len, file->f_pos, ino,
730 fattr.cf_dtype);
731
732 dput(dentry);
733 return rc;
734}
735
736
737int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
738{
739 int rc = 0;
740 unsigned int xid;
741 int i;
742 struct cifs_tcon *tcon;
743 struct cifsFileInfo *cifsFile = NULL;
744 char *current_entry;
745 int num_to_fill = 0;
746 char *tmp_buf = NULL;
747 char *end_of_smb;
748 unsigned int max_len;
749
750 xid = get_xid();
751
752 /*
753 * Ensure FindFirst doesn't fail before doing filldir() for '.' and
754 * '..'. Otherwise we won't be able to notify VFS in case of failure.
755 */
756 if (file->private_data == NULL) {
757 rc = initiate_cifs_search(xid, file);
758 cFYI(1, "initiate cifs search rc %d", rc);
759 if (rc)
760 goto rddir2_exit;
761 }
762
763 switch ((int) file->f_pos) {
764 case 0:
765 if (filldir(direntry, ".", 1, file->f_pos,
766 file->f_path.dentry->d_inode->i_ino, DT_DIR) < 0) {
767 cERROR(1, "Filldir for current dir failed");
768 rc = -ENOMEM;
769 break;
770 }
771 file->f_pos++;
772 case 1:
773 if (filldir(direntry, "..", 2, file->f_pos,
774 parent_ino(file->f_path.dentry), DT_DIR) < 0) {
775 cERROR(1, "Filldir for parent dir failed");
776 rc = -ENOMEM;
777 break;
778 }
779 file->f_pos++;
780 default:
781 /* 1) If search is active,
782 is in current search buffer?
783 if it before then restart search
784 if after then keep searching till find it */
785
786 if (file->private_data == NULL) {
787 rc = -EINVAL;
788 free_xid(xid);
789 return rc;
790 }
791 cifsFile = file->private_data;
792 if (cifsFile->srch_inf.endOfSearch) {
793 if (cifsFile->srch_inf.emptyDir) {
794 cFYI(1, "End of search, empty dir");
795 rc = 0;
796 break;
797 }
798 } /* else {
799 cifsFile->invalidHandle = true;
800 tcon->ses->server->close(xid, tcon, &cifsFile->fid);
801 } */
802
803 tcon = tlink_tcon(cifsFile->tlink);
804 rc = find_cifs_entry(xid, tcon, file, &current_entry,
805 &num_to_fill);
806 if (rc) {
807 cFYI(1, "fce error %d", rc);
808 goto rddir2_exit;
809 } else if (current_entry != NULL) {
810 cFYI(1, "entry %lld found", file->f_pos);
811 } else {
812 cFYI(1, "could not find entry");
813 goto rddir2_exit;
814 }
815 cFYI(1, "loop through %d times filling dir for net buf %p",
816 num_to_fill, cifsFile->srch_inf.ntwrk_buf_start);
817 max_len = tcon->ses->server->ops->calc_smb_size(
818 cifsFile->srch_inf.ntwrk_buf_start);
819 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len;
820
821 tmp_buf = kmalloc(UNICODE_NAME_MAX, GFP_KERNEL);
822 if (tmp_buf == NULL) {
823 rc = -ENOMEM;
824 break;
825 }
826
827 for (i = 0; (i < num_to_fill) && (rc == 0); i++) {
828 if (current_entry == NULL) {
829 /* evaluate whether this case is an error */
830 cERROR(1, "past SMB end, num to fill %d i %d",
831 num_to_fill, i);
832 break;
833 }
834 /*
835 * if buggy server returns . and .. late do we want to
836 * check for that here?
837 */
838 rc = cifs_filldir(current_entry, file, filldir,
839 direntry, tmp_buf, max_len);
840 if (rc == -EOVERFLOW) {
841 rc = 0;
842 break;
843 }
844
845 file->f_pos++;
846 if (file->f_pos ==
847 cifsFile->srch_inf.index_of_last_entry) {
848 cFYI(1, "last entry in buf at pos %lld %s",
849 file->f_pos, tmp_buf);
850 cifs_save_resume_key(current_entry, cifsFile);
851 break;
852 } else
853 current_entry =
854 nxt_dir_entry(current_entry, end_of_smb,
855 cifsFile->srch_inf.info_level);
856 }
857 kfree(tmp_buf);
858 break;
859 } /* end switch */
860
861rddir2_exit:
862 free_xid(xid);
863 return rc;
864}
Linux kernel - Deliverables
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