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1// SPDX-License-Identifier: LGPL-2.1
2/*
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 ([email protected])
9 *
10 */
11#include <linux/fs.h>
12#include <linux/namei.h>
13#include <linux/pagemap.h>
14#include <linux/slab.h>
15#include <linux/stat.h>
16#include "cifsglob.h"
17#include "cifsproto.h"
18#include "cifs_unicode.h"
19#include "cifs_debug.h"
20#include "cifs_fs_sb.h"
21#include "cifsfs.h"
22#include "smb2proto.h"
23#include "fs_context.h"
24#include "cached_dir.h"
25#include "reparse.h"
26
27/*
28 * To be safe - for UCS to UTF-8 with strings loaded with the rare long
29 * characters alloc more to account for such multibyte target UTF-8
30 * characters.
31 */
32#define UNICODE_NAME_MAX ((4 * NAME_MAX) + 2)
33
34#ifdef CONFIG_CIFS_DEBUG2
35static void dump_cifs_file_struct(struct file *file, char *label)
36{
37 struct cifsFileInfo *cf;
38
39 if (file) {
40 cf = file->private_data;
41 if (cf == NULL) {
42 cifs_dbg(FYI, "empty cifs private file data\n");
43 return;
44 }
45 if (cf->invalidHandle)
46 cifs_dbg(FYI, "Invalid handle\n");
47 if (cf->srch_inf.endOfSearch)
48 cifs_dbg(FYI, "end of search\n");
49 if (cf->srch_inf.emptyDir)
50 cifs_dbg(FYI, "empty dir\n");
51 }
52}
53#else
54static inline void dump_cifs_file_struct(struct file *file, char *label)
55{
56}
57#endif /* DEBUG2 */
58
59/*
60 * Attempt to preload the dcache with the results from the FIND_FIRST/NEXT
61 *
62 * Find the dentry that matches "name". If there isn't one, create one. If it's
63 * a negative dentry or the uniqueid or filetype(mode) changed,
64 * then drop it and recreate it.
65 */
66static void
67cifs_prime_dcache(struct dentry *parent, struct qstr *name,
68 struct cifs_fattr *fattr)
69{
70 struct dentry *dentry, *alias;
71 struct inode *inode;
72 struct super_block *sb = parent->d_sb;
73 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
74 bool posix = cifs_sb_master_tcon(cifs_sb)->posix_extensions;
75 bool reparse_need_reval = false;
76 int rc;
77
78 cifs_dbg(FYI, "%s: for %s\n", __func__, name->name);
79
80 dentry = try_lookup_noperm(name, parent);
81 if (!dentry) {
82 /*
83 * If we know that the inode will need to be revalidated
84 * immediately, then don't create a new dentry for it.
85 * We'll end up doing an on the wire call either way and
86 * this spares us an invalidation.
87 */
88retry:
89 if (posix) {
90 switch (fattr->cf_mode & S_IFMT) {
91 case S_IFLNK:
92 case S_IFBLK:
93 case S_IFCHR:
94 reparse_need_reval = true;
95 break;
96 default:
97 break;
98 }
99 } else if (fattr->cf_cifsattrs & ATTR_REPARSE_POINT) {
100 reparse_need_reval = true;
101 }
102
103 if (reparse_need_reval ||
104 (fattr->cf_flags & CIFS_FATTR_NEED_REVAL))
105 return;
106
107 dentry = d_alloc_parallel(parent, name);
108 }
109 if (IS_ERR(dentry))
110 return;
111 if (!d_in_lookup(dentry)) {
112 inode = d_inode(dentry);
113 if (inode) {
114 if (d_mountpoint(dentry)) {
115 dput(dentry);
116 return;
117 }
118 /*
119 * If we're generating inode numbers, then we don't
120 * want to clobber the existing one with the one that
121 * the readdir code created.
122 */
123 if (!(cifs_sb_flags(cifs_sb) & CIFS_MOUNT_SERVER_INUM))
124 fattr->cf_uniqueid = CIFS_I(inode)->uniqueid;
125
126 /*
127 * Update inode in place if both i_ino and i_mode didn't
128 * change.
129 */
130 if (CIFS_I(inode)->uniqueid == fattr->cf_uniqueid) {
131 /*
132 * Query dir responses don't provide enough
133 * information about reparse points other than
134 * their reparse tags. Save an invalidation by
135 * not clobbering some existing attributes when
136 * reparse tag and ctime haven't changed.
137 */
138 rc = 0;
139 if (fattr->cf_cifsattrs & ATTR_REPARSE_POINT) {
140 if (likely(reparse_inode_match(inode, fattr))) {
141 fattr->cf_mode = inode->i_mode;
142 fattr->cf_rdev = inode->i_rdev;
143 fattr->cf_uid = inode->i_uid;
144 fattr->cf_gid = inode->i_gid;
145 fattr->cf_eof =
146 netfs_read_remote_i_size(inode);
147 fattr->cf_symlink_target = NULL;
148 } else {
149 CIFS_I(inode)->time = 0;
150 rc = -ESTALE;
151 }
152 }
153 if (!rc && !cifs_fattr_to_inode(inode, fattr, true)) {
154 dput(dentry);
155 return;
156 }
157 }
158 }
159 d_invalidate(dentry);
160 dput(dentry);
161 goto retry;
162 } else {
163 inode = cifs_iget(sb, fattr);
164 if (!inode)
165 inode = ERR_PTR(-ENOMEM);
166 alias = d_splice_alias(inode, dentry);
167 d_lookup_done(dentry);
168 if (alias && !IS_ERR(alias))
169 dput(alias);
170 }
171 dput(dentry);
172}
173
174static void
175cifs_fill_common_info(struct cifs_fattr *fattr, struct cifs_sb_info *cifs_sb)
176{
177 struct cifs_open_info_data data = {
178 .reparse = { .tag = fattr->cf_cifstag, },
179 };
180 unsigned int sbflags;
181
182 fattr->cf_uid = cifs_sb->ctx->linux_uid;
183 fattr->cf_gid = cifs_sb->ctx->linux_gid;
184
185 /*
186 * The IO_REPARSE_TAG_LX_ tags originally were used by WSL but they
187 * are preferred by the Linux client in some cases since, unlike
188 * the NFS reparse tag (or EAs), they don't require an extra query
189 * to determine which type of special file they represent.
190 * TODO: go through all documented reparse tags to see if we can
191 * reasonably map some of them to directories vs. files vs. symlinks
192 */
193 if ((fattr->cf_cifsattrs & ATTR_REPARSE_POINT) &&
194 cifs_reparse_point_to_fattr(cifs_sb, fattr, &data))
195 goto out_reparse;
196
197 if (fattr->cf_cifsattrs & ATTR_DIRECTORY) {
198 fattr->cf_mode = S_IFDIR | cifs_sb->ctx->dir_mode;
199 fattr->cf_dtype = DT_DIR;
200 } else {
201 fattr->cf_mode = S_IFREG | cifs_sb->ctx->file_mode;
202 fattr->cf_dtype = DT_REG;
203 }
204
205out_reparse:
206 /* non-unix readdir doesn't provide nlink */
207 fattr->cf_flags |= CIFS_FATTR_UNKNOWN_NLINK;
208
209 if (fattr->cf_cifsattrs & ATTR_READONLY)
210 fattr->cf_mode &= ~S_IWUGO;
211
212 /*
213 * We of course don't get ACL info in FIND_FIRST/NEXT results, so
214 * mark it for revalidation so that "ls -l" will look right. It might
215 * be super-slow, but if we don't do this then the ownership of files
216 * may look wrong since the inodes may not have timed out by the time
217 * "ls" does a stat() call on them.
218 */
219 sbflags = cifs_sb_flags(cifs_sb);
220 if (sbflags & (CIFS_MOUNT_CIFS_ACL | CIFS_MOUNT_MODE_FROM_SID))
221 fattr->cf_flags |= CIFS_FATTR_NEED_REVAL;
222
223 if ((sbflags & CIFS_MOUNT_UNX_EMUL) &&
224 (fattr->cf_cifsattrs & ATTR_SYSTEM)) {
225 if (fattr->cf_eof == 0) {
226 fattr->cf_mode &= ~S_IFMT;
227 fattr->cf_mode |= S_IFIFO;
228 fattr->cf_dtype = DT_FIFO;
229 } else {
230 /*
231 * trying to get the type and mode via SFU can be slow,
232 * so just call those regular files for now, and mark
233 * for reval
234 */
235 fattr->cf_flags |= CIFS_FATTR_NEED_REVAL;
236 }
237 }
238}
239
240/* Fill a cifs_fattr struct with info from SMB_FIND_FILE_POSIX_INFO. */
241static void
242cifs_posix_to_fattr(struct cifs_fattr *fattr, struct smb2_posix_info *info,
243 struct cifs_sb_info *cifs_sb)
244{
245 unsigned int sbflags = cifs_sb_flags(cifs_sb);
246 struct smb2_posix_info_parsed parsed;
247 int rc;
248
249 rc = posix_info_parse(info, NULL, &parsed);
250
251 memset(fattr, 0, sizeof(*fattr));
252 fattr->cf_uniqueid = le64_to_cpu(info->Inode);
253 fattr->cf_bytes = le64_to_cpu(info->AllocationSize);
254 fattr->cf_eof = le64_to_cpu(info->EndOfFile);
255
256 fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
257 fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime);
258 fattr->cf_ctime = cifs_NTtimeToUnix(info->CreationTime);
259
260 fattr->cf_nlink = le32_to_cpu(info->HardLinks);
261 fattr->cf_cifsattrs = le32_to_cpu(info->DosAttributes);
262
263 if (fattr->cf_cifsattrs & ATTR_REPARSE_POINT)
264 fattr->cf_cifstag = le32_to_cpu(info->ReparseTag);
265
266 /* The Mode field in the response can now include the file type as well */
267 fattr->cf_mode = wire_mode_to_posix(le32_to_cpu(info->Mode),
268 fattr->cf_cifsattrs & ATTR_DIRECTORY);
269 fattr->cf_dtype = S_DT(fattr->cf_mode);
270
271 switch (fattr->cf_mode & S_IFMT) {
272 case S_IFLNK:
273 case S_IFBLK:
274 case S_IFCHR:
275 fattr->cf_flags |= CIFS_FATTR_NEED_REVAL;
276 break;
277 default:
278 break;
279 }
280
281 cifs_dbg(FYI, "posix fattr: dev %d, reparse %d, mode %o\n",
282 le32_to_cpu(info->DeviceId),
283 le32_to_cpu(info->ReparseTag),
284 le32_to_cpu(info->Mode));
285
286 fattr->cf_uid = cifs_sb->ctx->linux_uid;
287 fattr->cf_gid = cifs_sb->ctx->linux_gid;
288 if (rc < 0) {
289 cifs_dbg(VFS, "%s: failed to parse SIDs: %d\n",
290 __func__, rc);
291 } else {
292 if (!(sbflags & CIFS_MOUNT_OVERR_UID))
293 sid_to_id(cifs_sb, &parsed.owner, fattr, SIDOWNER);
294 if (!(sbflags & CIFS_MOUNT_OVERR_GID))
295 sid_to_id(cifs_sb, &parsed.group, fattr, SIDGROUP);
296 }
297}
298
299static void __dir_info_to_fattr(struct cifs_fattr *fattr, const void *info)
300{
301 const FILE_DIRECTORY_INFO *fi = info;
302
303 memset(fattr, 0, sizeof(*fattr));
304 fattr->cf_cifsattrs = le32_to_cpu(fi->ExtFileAttributes);
305 fattr->cf_eof = le64_to_cpu(fi->EndOfFile);
306 fattr->cf_bytes = le64_to_cpu(fi->AllocationSize);
307 fattr->cf_createtime = le64_to_cpu(fi->CreationTime);
308 fattr->cf_atime = cifs_NTtimeToUnix(fi->LastAccessTime);
309 fattr->cf_ctime = cifs_NTtimeToUnix(fi->ChangeTime);
310 fattr->cf_mtime = cifs_NTtimeToUnix(fi->LastWriteTime);
311}
312
313void
314cifs_dir_info_to_fattr(struct cifs_fattr *fattr, FILE_DIRECTORY_INFO *info,
315 struct cifs_sb_info *cifs_sb)
316{
317 __dir_info_to_fattr(fattr, info);
318 cifs_fill_common_info(fattr, cifs_sb);
319}
320
321static void cifs_fulldir_info_to_fattr(struct cifs_fattr *fattr,
322 const void *info,
323 struct cifs_sb_info *cifs_sb)
324{
325 const FILE_FULL_DIRECTORY_INFO *di = info;
326
327 __dir_info_to_fattr(fattr, info);
328
329 /* See MS-FSCC 2.4.14, 2.4.19 */
330 if (fattr->cf_cifsattrs & ATTR_REPARSE_POINT)
331 fattr->cf_cifstag = le32_to_cpu(di->EaSize);
332 cifs_fill_common_info(fattr, cifs_sb);
333}
334
335static void
336cifs_std_info_to_fattr(struct cifs_fattr *fattr, FIND_FILE_STANDARD_INFO *info,
337 struct cifs_sb_info *cifs_sb)
338{
339 int offset = cifs_sb_master_tcon(cifs_sb)->ses->server->timeAdj;
340
341 memset(fattr, 0, sizeof(*fattr));
342 fattr->cf_atime = cnvrtDosUnixTm(info->LastAccessDate,
343 info->LastAccessTime, offset);
344 fattr->cf_ctime = cnvrtDosUnixTm(info->LastWriteDate,
345 info->LastWriteTime, offset);
346 fattr->cf_mtime = cnvrtDosUnixTm(info->LastWriteDate,
347 info->LastWriteTime, offset);
348
349 fattr->cf_cifsattrs = le16_to_cpu(info->Attributes);
350 fattr->cf_bytes = le32_to_cpu(info->AllocationSize);
351 fattr->cf_eof = le32_to_cpu(info->DataSize);
352
353 cifs_fill_common_info(fattr, cifs_sb);
354}
355
356static int
357_initiate_cifs_search(const unsigned int xid, struct file *file,
358 const char *full_path)
359{
360 struct cifs_sb_info *cifs_sb = CIFS_SB(file);
361 struct tcon_link *tlink = NULL;
362 struct TCP_Server_Info *server;
363 struct cifsFileInfo *cifsFile;
364 struct cifs_tcon *tcon;
365 unsigned int sbflags;
366 __u16 search_flags;
367 int rc = 0;
368
369 if (file->private_data == NULL) {
370 tlink = cifs_sb_tlink(cifs_sb);
371 if (IS_ERR(tlink))
372 return PTR_ERR(tlink);
373
374 cifsFile = kzalloc_obj(struct cifsFileInfo);
375 if (cifsFile == NULL) {
376 rc = -ENOMEM;
377 goto error_exit;
378 }
379 spin_lock_init(&cifsFile->file_info_lock);
380 file->private_data = cifsFile;
381 cifsFile->tlink = cifs_get_tlink(tlink);
382 tcon = tlink_tcon(tlink);
383 } else {
384 cifsFile = file->private_data;
385 tcon = tlink_tcon(cifsFile->tlink);
386 }
387
388 server = tcon->ses->server;
389
390 if (!server->ops->query_dir_first) {
391 rc = -ENOSYS;
392 goto error_exit;
393 }
394
395 cifsFile->invalidHandle = true;
396 cifsFile->srch_inf.endOfSearch = false;
397
398 cifs_dbg(FYI, "Full path: %s start at: %lld\n", full_path, file->f_pos);
399
400ffirst_retry:
401 sbflags = cifs_sb_flags(cifs_sb);
402 /* test for Unix extensions */
403 /* but now check for them on the share/mount not on the SMB session */
404 /* if (cap_unix(tcon->ses) { */
405 if (tcon->unix_ext)
406 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
407 else if (tcon->posix_extensions)
408 cifsFile->srch_inf.info_level = SMB_FIND_FILE_POSIX_INFO;
409 else if ((tcon->ses->capabilities &
410 tcon->ses->server->vals->cap_nt_find) == 0) {
411 cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD;
412 } else if (sbflags & CIFS_MOUNT_SERVER_INUM) {
413 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
414 } else /* not srvinos - BB fixme add check for backlevel? */ {
415 cifsFile->srch_inf.info_level = SMB_FIND_FILE_FULL_DIRECTORY_INFO;
416 }
417
418 search_flags = CIFS_SEARCH_CLOSE_AT_END | CIFS_SEARCH_RETURN_RESUME;
419 if (backup_cred(cifs_sb))
420 search_flags |= CIFS_SEARCH_BACKUP_SEARCH;
421
422 rc = server->ops->query_dir_first(xid, tcon, full_path, cifs_sb,
423 &cifsFile->fid, search_flags,
424 &cifsFile->srch_inf);
425
426 if (rc == 0) {
427 cifsFile->invalidHandle = false;
428 } else if (rc == -EOPNOTSUPP && (sbflags & CIFS_MOUNT_SERVER_INUM)) {
429 cifs_autodisable_serverino(cifs_sb, "Cannot retrieve inode number via query_dir_first", rc);
430 goto ffirst_retry;
431 }
432error_exit:
433 cifs_put_tlink(tlink);
434 return rc;
435}
436
437static int
438initiate_cifs_search(const unsigned int xid, struct file *file,
439 const char *full_path)
440{
441 int rc, retry_count = 0;
442
443 do {
444 rc = _initiate_cifs_search(xid, file, full_path);
445 /*
446 * If we don't have enough credits to start reading the
447 * directory just try again after short wait.
448 */
449 if (rc != -EDEADLK)
450 break;
451
452 usleep_range(512, 2048);
453 } while (retry_count++ < 5);
454
455 return rc;
456}
457
458/* return length of unicode string in bytes */
459static size_t cifs_unicode_bytelen(const char *str, size_t maxlen)
460{
461 const __le16 *ustr = (const __le16 *)str;
462 size_t len;
463
464 maxlen = umin(PATH_MAX + 1, maxlen / sizeof(__le16));
465 for (len = 0; len < maxlen; len++) {
466 if (ustr[len] == 0)
467 return len * sizeof(__le16);
468 }
469 len *= sizeof(__le16);
470 cifs_dbg(FYI, "%s: Unicode string not terminated within %zu bytes\n",
471 __func__, len);
472 return len;
473}
474
475static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level)
476{
477 char *new_entry;
478 FILE_DIRECTORY_INFO *pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
479
480 if (level == SMB_FIND_FILE_INFO_STANDARD) {
481 FIND_FILE_STANDARD_INFO *pfData;
482 pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo;
483
484 new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) + 1 +
485 pfData->FileNameLength;
486 } else {
487 u32 next_offset = le32_to_cpu(pDirInfo->NextEntryOffset);
488
489 if (old_entry + next_offset < old_entry) {
490 cifs_dbg(VFS, "Invalid offset %u\n", next_offset);
491 return NULL;
492 }
493 new_entry = old_entry + next_offset;
494 }
495 cifs_dbg(FYI, "new entry %p old entry %p\n", new_entry, old_entry);
496 /* validate that new_entry is not past end of SMB */
497 if (new_entry >= end_of_smb) {
498 cifs_dbg(VFS, "search entry %p began after end of SMB %p old entry %p\n",
499 new_entry, end_of_smb, old_entry);
500 return NULL;
501 } else if (((level == SMB_FIND_FILE_INFO_STANDARD) &&
502 (new_entry + sizeof(FIND_FILE_STANDARD_INFO) + 1 > end_of_smb))
503 || ((level != SMB_FIND_FILE_INFO_STANDARD) &&
504 (new_entry + sizeof(FILE_DIRECTORY_INFO) + 1 > end_of_smb))) {
505 cifs_dbg(VFS, "search entry %p extends after end of SMB %p\n",
506 new_entry, end_of_smb);
507 return NULL;
508 } else
509 return new_entry;
510
511}
512
513struct cifs_dirent {
514 const char *name;
515 size_t namelen;
516 u32 resume_key;
517 u64 ino;
518};
519
520static void cifs_fill_dirent_posix(struct cifs_dirent *de,
521 const struct smb2_posix_info *info)
522{
523 struct smb2_posix_info_parsed parsed;
524
525 /* payload should have already been checked at this point */
526 if (posix_info_parse(info, NULL, &parsed) < 0) {
527 cifs_dbg(VFS, "Invalid POSIX info payload\n");
528 return;
529 }
530
531 de->name = parsed.name;
532 de->namelen = parsed.name_len;
533 de->resume_key = info->Ignored;
534 de->ino = le64_to_cpu(info->Inode);
535}
536
537static void cifs_fill_dirent_unix(struct cifs_dirent *de,
538 const FILE_UNIX_INFO *info, bool is_unicode, size_t maxlen)
539{
540 de->name = &info->FileName[0];
541 if (is_unicode)
542 de->namelen = cifs_unicode_bytelen(de->name, maxlen);
543 else
544 de->namelen = strnlen(de->name, min_t(size_t, maxlen, PATH_MAX));
545 de->resume_key = info->ResumeKey;
546 de->ino = le64_to_cpu(info->basic.UniqueId);
547}
548
549static void cifs_fill_dirent_dir(struct cifs_dirent *de,
550 const FILE_DIRECTORY_INFO *info)
551{
552 de->name = &info->FileName[0];
553 de->namelen = le32_to_cpu(info->FileNameLength);
554 de->resume_key = info->FileIndex;
555}
556
557static void cifs_fill_dirent_full(struct cifs_dirent *de,
558 const FILE_FULL_DIRECTORY_INFO *info)
559{
560 de->name = &info->FileName[0];
561 de->namelen = le32_to_cpu(info->FileNameLength);
562 de->resume_key = info->FileIndex;
563}
564
565static void cifs_fill_dirent_search(struct cifs_dirent *de,
566 const FILE_ID_FULL_DIR_INFO *info)
567{
568 de->name = &info->FileName[0];
569 de->namelen = le32_to_cpu(info->FileNameLength);
570 de->resume_key = info->FileIndex;
571 de->ino = le64_to_cpu(info->UniqueId);
572}
573
574static void cifs_fill_dirent_both(struct cifs_dirent *de,
575 const FILE_BOTH_DIRECTORY_INFO *info)
576{
577 de->name = &info->FileName[0];
578 de->namelen = le32_to_cpu(info->FileNameLength);
579 de->resume_key = info->FileIndex;
580}
581
582static void cifs_fill_dirent_std(struct cifs_dirent *de,
583 const FIND_FILE_STANDARD_INFO *info)
584{
585 de->name = &info->FileName[0];
586 /* one byte length, no endianness conversion */
587 de->namelen = info->FileNameLength;
588 de->resume_key = info->ResumeKey;
589}
590
591static int cifs_fill_dirent(struct cifs_dirent *de, const void *info,
592 const char *end, u16 level, bool is_unicode)
593{
594 size_t len = end > (const char *)info ? end - (const char *)info : 0;
595 size_t nul_len = 0;
596
597 memset(de, 0, sizeof(*de));
598
599 switch (level) {
600 case SMB_FIND_FILE_POSIX_INFO:
601 if (len < sizeof(struct smb2_posix_info))
602 goto too_short;
603 cifs_fill_dirent_posix(de, info);
604 break;
605 case SMB_FIND_FILE_UNIX:
606 if (len < offsetof(FILE_UNIX_INFO, FileName))
607 goto too_short;
608 cifs_fill_dirent_unix(de, info, is_unicode,
609 len - offsetof(FILE_UNIX_INFO, FileName));
610 nul_len = is_unicode ? sizeof(__le16) : sizeof(__u8);
611 break;
612 case SMB_FIND_FILE_DIRECTORY_INFO:
613 if (len < offsetof(FILE_DIRECTORY_INFO, FileName))
614 goto too_short;
615 cifs_fill_dirent_dir(de, info);
616 break;
617 case SMB_FIND_FILE_FULL_DIRECTORY_INFO:
618 if (len < offsetof(FILE_FULL_DIRECTORY_INFO, FileName))
619 goto too_short;
620 cifs_fill_dirent_full(de, info);
621 break;
622 case SMB_FIND_FILE_ID_FULL_DIR_INFO:
623 if (len < offsetof(FILE_ID_FULL_DIR_INFO, FileName))
624 goto too_short;
625 cifs_fill_dirent_search(de, info);
626 break;
627 case SMB_FIND_FILE_BOTH_DIRECTORY_INFO:
628 if (len < offsetof(FILE_BOTH_DIRECTORY_INFO, FileName))
629 goto too_short;
630 cifs_fill_dirent_both(de, info);
631 break;
632 case SMB_FIND_FILE_INFO_STANDARD:
633 if (len < offsetof(FIND_FILE_STANDARD_INFO, FileName))
634 goto too_short;
635 cifs_fill_dirent_std(de, info);
636 break;
637 default:
638 cifs_dbg(FYI, "Unknown findfirst level %d\n", level);
639 return -EINVAL;
640 }
641
642 if (de->name &&
643 (end < de->name ||
644 (size_t)(end - de->name) < de->namelen + nul_len)) {
645 cifs_dbg(VFS, "%s: search entry name extends past end of SMB\n",
646 __func__);
647 return -EINVAL;
648 }
649
650 return 0;
651
652too_short:
653 cifs_dbg(VFS, "%s: search entry extends past end of SMB\n",
654 __func__);
655 return -EINVAL;
656}
657
658#define UNICODE_DOT cpu_to_le16(0x2e)
659
660/* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
661static int cifs_entry_is_dot(struct cifs_dirent *de, bool is_unicode)
662{
663 int rc = 0;
664
665 if (!de->name)
666 return 0;
667
668 if (is_unicode) {
669 __le16 *ufilename = (__le16 *)de->name;
670 if (de->namelen == 2) {
671 /* check for . */
672 if (ufilename[0] == UNICODE_DOT)
673 rc = 1;
674 } else if (de->namelen == 4) {
675 /* check for .. */
676 if (ufilename[0] == UNICODE_DOT &&
677 ufilename[1] == UNICODE_DOT)
678 rc = 2;
679 }
680 } else /* ASCII */ {
681 if (de->namelen == 1) {
682 if (de->name[0] == '.')
683 rc = 1;
684 } else if (de->namelen == 2) {
685 if (de->name[0] == '.' && de->name[1] == '.')
686 rc = 2;
687 }
688 }
689
690 return rc;
691}
692
693/* Check if directory that we are searching has changed so we can decide
694 whether we can use the cached search results from the previous search */
695static int is_dir_changed(struct file *file)
696{
697 struct inode *inode = file_inode(file);
698 struct cifsInodeInfo *cifs_inode_info = CIFS_I(inode);
699
700 if (cifs_inode_info->time == 0)
701 return 1; /* directory was changed, e.g. unlink or new file */
702 else
703 return 0;
704
705}
706
707static int cifs_save_resume_key(const char *current_entry,
708 struct cifsFileInfo *file_info)
709{
710 struct TCP_Server_Info *server = tlink_tcon(file_info->tlink)->ses->server;
711 char *buf = file_info->srch_inf.ntwrk_buf_start;
712 const char *end = buf + server->ops->calc_smb_size(buf);
713 struct cifs_dirent de;
714 int rc;
715
716 rc = cifs_fill_dirent(&de, current_entry, end,
717 file_info->srch_inf.info_level,
718 file_info->srch_inf.unicode);
719 if (!rc) {
720 file_info->srch_inf.presume_name = de.name;
721 file_info->srch_inf.resume_name_len = de.namelen;
722 file_info->srch_inf.resume_key = de.resume_key;
723 }
724 return rc;
725}
726
727/*
728 * Find the corresponding entry in the search. Note that the SMB server returns
729 * search entries for . and .. which complicates logic here if we choose to
730 * parse for them and we do not assume that they are located in the findfirst
731 * return buffer. We start counting in the buffer with entry 2 and increment for
732 * every entry (do not increment for . or .. entry).
733 */
734static int
735find_cifs_entry(const unsigned int xid, struct cifs_tcon *tcon, loff_t pos,
736 struct file *file, const char *full_path,
737 char **current_entry, int *num_to_ret)
738{
739 __u16 search_flags;
740 int rc = 0;
741 int pos_in_buf = 0;
742 loff_t first_entry_in_buffer;
743 loff_t index_to_find = pos;
744 struct cifsFileInfo *cfile = file->private_data;
745 struct cifs_sb_info *cifs_sb = CIFS_SB(file);
746 struct TCP_Server_Info *server = tcon->ses->server;
747 /* check if index in the buffer */
748
749 if (!server->ops->query_dir_first || !server->ops->query_dir_next)
750 return -ENOSYS;
751
752 if ((cfile == NULL) || (current_entry == NULL) || (num_to_ret == NULL))
753 return -ENOENT;
754
755 *current_entry = NULL;
756 first_entry_in_buffer = cfile->srch_inf.index_of_last_entry -
757 cfile->srch_inf.entries_in_buffer;
758
759 /*
760 * If first entry in buf is zero then is first buffer
761 * in search response data which means it is likely . and ..
762 * will be in this buffer, although some servers do not return
763 * . and .. for the root of a drive and for those we need
764 * to start two entries earlier.
765 */
766
767 dump_cifs_file_struct(file, "In fce ");
768 if (((index_to_find < cfile->srch_inf.index_of_last_entry) &&
769 is_dir_changed(file)) || (index_to_find < first_entry_in_buffer)) {
770 /* close and restart search */
771 cifs_dbg(FYI, "search backing up - close and restart search\n");
772 spin_lock(&cfile->file_info_lock);
773 if (server->ops->dir_needs_close(cfile)) {
774 cfile->invalidHandle = true;
775 spin_unlock(&cfile->file_info_lock);
776 if (server->ops->close_dir)
777 server->ops->close_dir(xid, tcon, &cfile->fid);
778 } else
779 spin_unlock(&cfile->file_info_lock);
780 if (cfile->srch_inf.ntwrk_buf_start) {
781 cifs_dbg(FYI, "freeing SMB ff cache buf on search rewind\n");
782 if (cfile->srch_inf.smallBuf)
783 cifs_small_buf_release(cfile->srch_inf.
784 ntwrk_buf_start);
785 else if (cfile->srch_inf.is_dynamic_buf)
786 kfree(cfile->srch_inf.ntwrk_buf_start);
787 else
788 cifs_buf_release(cfile->srch_inf.
789 ntwrk_buf_start);
790 /* Reset all pointers to the network buffer to prevent stale references */
791 cfile->srch_inf.ntwrk_buf_start = NULL;
792 cfile->srch_inf.srch_entries_start = NULL;
793 cfile->srch_inf.last_entry = NULL;
794 cfile->srch_inf.presume_name = NULL;
795 cfile->srch_inf.resume_name_len = 0;
796 cfile->srch_inf.resume_key = 0;
797 }
798 rc = initiate_cifs_search(xid, file, full_path);
799 if (rc) {
800 cifs_dbg(FYI, "error %d reinitiating a search on rewind\n",
801 rc);
802 return rc;
803 }
804 /* FindFirst/Next set last_entry to NULL on malformed reply */
805 if (cfile->srch_inf.last_entry)
806 cifs_save_resume_key(cfile->srch_inf.last_entry, cfile);
807 }
808
809 search_flags = CIFS_SEARCH_CLOSE_AT_END | CIFS_SEARCH_RETURN_RESUME;
810 if (backup_cred(cifs_sb))
811 search_flags |= CIFS_SEARCH_BACKUP_SEARCH;
812
813 while ((index_to_find >= cfile->srch_inf.index_of_last_entry) &&
814 (rc == 0) && !cfile->srch_inf.endOfSearch) {
815 cifs_dbg(FYI, "calling findnext2\n");
816 rc = server->ops->query_dir_next(xid, tcon, &cfile->fid,
817 search_flags,
818 &cfile->srch_inf);
819 if (rc)
820 return -ENOENT;
821 /* FindFirst/Next set last_entry to NULL on malformed reply */
822 if (cfile->srch_inf.last_entry)
823 cifs_save_resume_key(cfile->srch_inf.last_entry, cfile);
824 }
825 if (index_to_find < cfile->srch_inf.index_of_last_entry) {
826 /* we found the buffer that contains the entry */
827 /* scan and find it */
828 int i;
829 char *cur_ent;
830 char *end_of_smb;
831
832 if (cfile->srch_inf.ntwrk_buf_start == NULL) {
833 cifs_dbg(VFS, "ntwrk_buf_start is NULL during readdir\n");
834 return smb_EIO(smb_eio_trace_null_pointers);
835 }
836
837 end_of_smb = cfile->srch_inf.ntwrk_buf_start +
838 server->ops->calc_smb_size(
839 cfile->srch_inf.ntwrk_buf_start);
840
841 cur_ent = cfile->srch_inf.srch_entries_start;
842 first_entry_in_buffer = cfile->srch_inf.index_of_last_entry
843 - cfile->srch_inf.entries_in_buffer;
844 pos_in_buf = index_to_find - first_entry_in_buffer;
845 cifs_dbg(FYI, "found entry - pos_in_buf %d\n", pos_in_buf);
846
847 for (i = 0; (i < (pos_in_buf)) && (cur_ent != NULL); i++) {
848 /* go entry by entry figuring out which is first */
849 cur_ent = nxt_dir_entry(cur_ent, end_of_smb,
850 cfile->srch_inf.info_level);
851 }
852 if ((cur_ent == NULL) && (i < pos_in_buf)) {
853 /* BB fixme - check if we should flag this error */
854 cifs_dbg(VFS, "reached end of buf searching for pos in buf %d index to find %lld rc %d\n",
855 pos_in_buf, index_to_find, rc);
856 }
857 rc = 0;
858 *current_entry = cur_ent;
859 } else {
860 cifs_dbg(FYI, "index not in buffer - could not findnext into it\n");
861 return 0;
862 }
863
864 if (pos_in_buf >= cfile->srch_inf.entries_in_buffer) {
865 cifs_dbg(FYI, "can not return entries pos_in_buf beyond last\n");
866 *num_to_ret = 0;
867 } else
868 *num_to_ret = cfile->srch_inf.entries_in_buffer - pos_in_buf;
869
870 return rc;
871}
872
873static bool emit_cached_dirents(struct cached_dirents *cde,
874 struct dir_context *ctx)
875{
876 struct cached_dirent *dirent;
877 bool rc;
878
879 list_for_each_entry(dirent, &cde->entries, entry) {
880 /*
881 * Skip all early entries prior to the current lseek()
882 * position.
883 */
884 if (ctx->pos > dirent->pos)
885 continue;
886 /*
887 * We recorded the current ->pos value for the dirent
888 * when we stored it in the cache.
889 * However, this sequence of ->pos values may have holes
890 * in it, for example dot-dirs returned from the server
891 * are suppressed.
892 * Handle this by forcing ctx->pos to be the same as the
893 * ->pos of the current dirent we emit from the cache.
894 * This means that when we emit these entries from the cache
895 * we now emit them with the same ->pos value as in the
896 * initial scan.
897 */
898 ctx->pos = dirent->pos;
899 rc = dir_emit(ctx, dirent->name, dirent->namelen,
900 dirent->fattr.cf_uniqueid,
901 dirent->fattr.cf_dtype);
902 if (!rc)
903 return rc;
904 ctx->pos++;
905 }
906 return true;
907}
908
909static void update_cached_dirents_count(struct cached_dirents *cde,
910 struct file *file)
911{
912 if (cde->file != file)
913 return;
914 if (cde->is_valid || cde->is_failed)
915 return;
916
917 cde->pos++;
918}
919
920static void finished_cached_dirents_count(struct cached_dirents *cde,
921 struct dir_context *ctx, struct file *file)
922{
923 if (cde->file != file)
924 return;
925 if (cde->is_valid || cde->is_failed)
926 return;
927 if (ctx->pos != cde->pos)
928 return;
929
930 cde->is_valid = 1;
931}
932
933static bool add_cached_dirent(struct cached_dirents *cde,
934 struct dir_context *ctx, const char *name,
935 int namelen, struct cifs_fattr *fattr,
936 struct file *file)
937{
938 struct cached_dirent *de;
939
940 if (cde->file != file)
941 return false;
942 if (cde->is_valid || cde->is_failed)
943 return false;
944 if (ctx->pos != cde->pos) {
945 cde->is_failed = 1;
946 return false;
947 }
948 de = kzalloc_obj(*de, GFP_ATOMIC);
949 if (de == NULL) {
950 cde->is_failed = 1;
951 return false;
952 }
953 de->namelen = namelen;
954 de->name = kstrndup(name, namelen, GFP_ATOMIC);
955 if (de->name == NULL) {
956 kfree(de);
957 cde->is_failed = 1;
958 return false;
959 }
960 de->pos = ctx->pos;
961
962 memcpy(&de->fattr, fattr, sizeof(struct cifs_fattr));
963
964 list_add_tail(&de->entry, &cde->entries);
965 /* update accounting */
966 cde->entries_count++;
967 cde->bytes_used += sizeof(*de) + (size_t)namelen + 1;
968 return true;
969}
970
971static bool cifs_dir_emit(struct dir_context *ctx,
972 const char *name, int namelen,
973 struct cifs_fattr *fattr,
974 struct cached_fid *cfid,
975 struct file *file)
976{
977 size_t delta_bytes = 0;
978 bool rc, added = false;
979 ino_t ino = cifs_uniqueid_to_ino_t(fattr->cf_uniqueid);
980
981 rc = dir_emit(ctx, name, namelen, ino, fattr->cf_dtype);
982 if (!rc)
983 return rc;
984
985 if (cfid) {
986 /* Cost of this entry */
987 delta_bytes = sizeof(struct cached_dirent) + (size_t)namelen + 1;
988
989 mutex_lock(&cfid->dirents.de_mutex);
990 added = add_cached_dirent(&cfid->dirents, ctx, name, namelen,
991 fattr, file);
992 mutex_unlock(&cfid->dirents.de_mutex);
993
994 if (added) {
995 /* per-tcon then global for consistency with free path */
996 atomic64_add((long long)delta_bytes, &cfid->cfids->total_dirents_bytes);
997 atomic_long_inc(&cfid->cfids->total_dirents_entries);
998 atomic64_add((long long)delta_bytes, &cifs_dircache_bytes_used);
999 }
1000 }
1001
1002 return rc;
1003}
1004
1005static int cifs_filldir(char *find_entry, struct file *file,
1006 struct dir_context *ctx,
1007 char *scratch_buf, unsigned int max_len,
1008 char *end_of_smb, struct cached_fid *cfid)
1009{
1010 struct cifsFileInfo *file_info = file->private_data;
1011 struct super_block *sb = file_inode(file)->i_sb;
1012 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
1013 struct cifs_dirent de = { NULL, };
1014 struct cifs_fattr fattr;
1015 unsigned int sbflags;
1016 struct qstr name;
1017 int rc = 0;
1018
1019 rc = cifs_fill_dirent(&de, find_entry, end_of_smb,
1020 file_info->srch_inf.info_level,
1021 file_info->srch_inf.unicode);
1022 if (rc)
1023 return rc;
1024
1025 /* skip . and .. since we added them first */
1026 if (cifs_entry_is_dot(&de, file_info->srch_inf.unicode))
1027 return 0;
1028
1029 if (file_info->srch_inf.unicode) {
1030 struct nls_table *nlt = cifs_sb->local_nls;
1031 int map_type;
1032
1033 map_type = cifs_remap(cifs_sb);
1034 name.name = scratch_buf;
1035 name.len =
1036 cifs_from_utf16((char *)name.name, (__le16 *)de.name,
1037 UNICODE_NAME_MAX,
1038 min_t(size_t, de.namelen,
1039 (size_t)max_len), nlt, map_type);
1040 name.len -= nls_nullsize(nlt);
1041 } else {
1042 name.name = de.name;
1043 name.len = de.namelen;
1044 }
1045
1046 switch (file_info->srch_inf.info_level) {
1047 case SMB_FIND_FILE_POSIX_INFO:
1048 cifs_posix_to_fattr(&fattr,
1049 (struct smb2_posix_info *)find_entry,
1050 cifs_sb);
1051 break;
1052 case SMB_FIND_FILE_UNIX:
1053 cifs_unix_basic_to_fattr(&fattr,
1054 &((FILE_UNIX_INFO *)find_entry)->basic,
1055 cifs_sb);
1056 if (S_ISLNK(fattr.cf_mode))
1057 fattr.cf_flags |= CIFS_FATTR_NEED_REVAL;
1058 break;
1059 case SMB_FIND_FILE_INFO_STANDARD:
1060 cifs_std_info_to_fattr(&fattr,
1061 (FIND_FILE_STANDARD_INFO *)find_entry,
1062 cifs_sb);
1063 break;
1064 case SMB_FIND_FILE_FULL_DIRECTORY_INFO:
1065 case SMB_FIND_FILE_ID_FULL_DIR_INFO:
1066 cifs_fulldir_info_to_fattr(&fattr, find_entry, cifs_sb);
1067 break;
1068 default:
1069 cifs_dir_info_to_fattr(&fattr,
1070 (FILE_DIRECTORY_INFO *)find_entry,
1071 cifs_sb);
1072 break;
1073 }
1074
1075 sbflags = cifs_sb_flags(cifs_sb);
1076 if (de.ino && (sbflags & CIFS_MOUNT_SERVER_INUM)) {
1077 fattr.cf_uniqueid = de.ino;
1078 } else {
1079 fattr.cf_uniqueid = iunique(sb, ROOT_I);
1080 cifs_autodisable_serverino(cifs_sb, "Cannot retrieve inode number from readdir", 0);
1081 }
1082
1083 if ((sbflags & CIFS_MOUNT_MF_SYMLINKS) && couldbe_mf_symlink(&fattr))
1084 /*
1085 * trying to get the type and mode can be slow,
1086 * so just call those regular files for now, and mark
1087 * for reval
1088 */
1089 fattr.cf_flags |= CIFS_FATTR_NEED_REVAL;
1090
1091 cifs_prime_dcache(file_dentry(file), &name, &fattr);
1092
1093 return !cifs_dir_emit(ctx, name.name, name.len,
1094 &fattr, cfid, file);
1095}
1096
1097
1098int cifs_readdir(struct file *file, struct dir_context *ctx)
1099{
1100 int rc = 0;
1101 unsigned int xid;
1102 int i;
1103 struct tcon_link *tlink = NULL;
1104 struct cifs_tcon *tcon;
1105 struct cifsFileInfo *cifsFile;
1106 char *current_entry;
1107 int num_to_fill = 0;
1108 char *tmp_buf = NULL;
1109 char *end_of_smb;
1110 unsigned int max_len;
1111 const char *full_path;
1112 void *page = alloc_dentry_path();
1113 struct cached_fid *cfid = NULL;
1114 struct cifs_sb_info *cifs_sb = CIFS_SB(file);
1115
1116 xid = get_xid();
1117
1118 full_path = build_path_from_dentry(file_dentry(file), page);
1119 if (IS_ERR(full_path)) {
1120 rc = PTR_ERR(full_path);
1121 goto rddir2_exit;
1122 }
1123
1124 if (file->private_data == NULL) {
1125 tlink = cifs_sb_tlink(cifs_sb);
1126 if (IS_ERR(tlink))
1127 goto cache_not_found;
1128 tcon = tlink_tcon(tlink);
1129 } else {
1130 cifsFile = file->private_data;
1131 tcon = tlink_tcon(cifsFile->tlink);
1132 }
1133
1134 rc = open_cached_dir(xid, tcon, full_path, cifs_sb, false, &cfid);
1135 cifs_put_tlink(tlink);
1136 if (rc)
1137 goto cache_not_found;
1138
1139 mutex_lock(&cfid->dirents.de_mutex);
1140 /*
1141 * If this was reading from the start of the directory
1142 * we need to initialize scanning and storing the
1143 * directory content.
1144 */
1145 if (ctx->pos == 0 && cfid->dirents.file == NULL) {
1146 cfid->dirents.file = file;
1147 cfid->dirents.pos = 2;
1148 }
1149 /*
1150 * If we already have the entire directory cached then
1151 * we can just serve the cache.
1152 */
1153 if (cfid->dirents.is_valid) {
1154 if (!dir_emit_dots(file, ctx)) {
1155 mutex_unlock(&cfid->dirents.de_mutex);
1156 goto rddir2_exit;
1157 }
1158 emit_cached_dirents(&cfid->dirents, ctx);
1159 mutex_unlock(&cfid->dirents.de_mutex);
1160 goto rddir2_exit;
1161 }
1162 mutex_unlock(&cfid->dirents.de_mutex);
1163
1164 /* Drop the cache while calling initiate_cifs_search and
1165 * find_cifs_entry in case there will be reconnects during
1166 * query_directory.
1167 */
1168 close_cached_dir(cfid);
1169 cfid = NULL;
1170
1171 cache_not_found:
1172 /*
1173 * Ensure FindFirst doesn't fail before doing filldir() for '.' and
1174 * '..'. Otherwise we won't be able to notify VFS in case of failure.
1175 */
1176 if (file->private_data == NULL) {
1177 rc = initiate_cifs_search(xid, file, full_path);
1178 cifs_dbg(FYI, "initiate cifs search rc %d\n", rc);
1179 if (rc)
1180 goto rddir2_exit;
1181 }
1182
1183 if (!dir_emit_dots(file, ctx))
1184 goto rddir2_exit;
1185
1186 /* 1) If search is active,
1187 is in current search buffer?
1188 if it before then restart search
1189 if after then keep searching till find it */
1190 cifsFile = file->private_data;
1191 if (cifsFile->srch_inf.endOfSearch) {
1192 if (cifsFile->srch_inf.emptyDir) {
1193 cifs_dbg(FYI, "End of search, empty dir\n");
1194 rc = 0;
1195 goto rddir2_exit;
1196 }
1197 } /* else {
1198 cifsFile->invalidHandle = true;
1199 tcon->ses->server->close(xid, tcon, &cifsFile->fid);
1200 } */
1201
1202 tcon = tlink_tcon(cifsFile->tlink);
1203 rc = find_cifs_entry(xid, tcon, ctx->pos, file, full_path,
1204 &current_entry, &num_to_fill);
1205 open_cached_dir(xid, tcon, full_path, cifs_sb, false, &cfid);
1206 if (rc) {
1207 cifs_dbg(FYI, "fce error %d\n", rc);
1208 goto rddir2_exit;
1209 } else if (current_entry != NULL) {
1210 cifs_dbg(FYI, "entry %lld found\n", ctx->pos);
1211 } else {
1212 if (cfid) {
1213 mutex_lock(&cfid->dirents.de_mutex);
1214 finished_cached_dirents_count(&cfid->dirents, ctx, file);
1215 mutex_unlock(&cfid->dirents.de_mutex);
1216 }
1217 cifs_dbg(FYI, "Could not find entry\n");
1218 goto rddir2_exit;
1219 }
1220 cifs_dbg(FYI, "loop through %d times filling dir for net buf %p\n",
1221 num_to_fill, cifsFile->srch_inf.ntwrk_buf_start);
1222 max_len = tcon->ses->server->ops->calc_smb_size(
1223 cifsFile->srch_inf.ntwrk_buf_start);
1224 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len;
1225
1226 tmp_buf = kmalloc(UNICODE_NAME_MAX, GFP_KERNEL);
1227 if (tmp_buf == NULL) {
1228 rc = -ENOMEM;
1229 goto rddir2_exit;
1230 }
1231
1232 for (i = 0; i < num_to_fill; i++) {
1233 if (current_entry == NULL) {
1234 /* evaluate whether this case is an error */
1235 cifs_dbg(VFS, "past SMB end, num to fill %d i %d\n",
1236 num_to_fill, i);
1237 break;
1238 }
1239 /*
1240 * if buggy server returns . and .. late do we want to
1241 * check for that here?
1242 */
1243 *tmp_buf = 0;
1244 rc = cifs_filldir(current_entry, file, ctx,
1245 tmp_buf, max_len, end_of_smb, cfid);
1246 if (rc) {
1247 if (rc > 0)
1248 rc = 0;
1249 break;
1250 }
1251
1252 ctx->pos++;
1253 if (cfid) {
1254 mutex_lock(&cfid->dirents.de_mutex);
1255 update_cached_dirents_count(&cfid->dirents, file);
1256 mutex_unlock(&cfid->dirents.de_mutex);
1257 }
1258
1259 if (ctx->pos ==
1260 cifsFile->srch_inf.index_of_last_entry) {
1261 cifs_dbg(FYI, "last entry in buf at pos %lld %s\n",
1262 ctx->pos, tmp_buf);
1263 cifs_save_resume_key(current_entry, cifsFile);
1264 break;
1265 }
1266 current_entry =
1267 nxt_dir_entry(current_entry, end_of_smb,
1268 cifsFile->srch_inf.info_level);
1269 }
1270 kfree(tmp_buf);
1271
1272rddir2_exit:
1273 if (cfid)
1274 close_cached_dir(cfid);
1275 free_dentry_path(page);
1276 free_xid(xid);
1277 return rc;
1278}