4 * Directory search handling
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)
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.
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.
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
25 #include <linux/pagemap.h>
26 #include <linux/slab.h>
27 #include <linux/stat.h>
30 #include "cifsproto.h"
31 #include "cifs_unicode.h"
32 #include "cifs_debug.h"
33 #include "cifs_fs_sb.h"
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
41 #define UNICODE_NAME_MAX ((4 * NAME_MAX) + 2)
43 #ifdef CONFIG_CIFS_DEBUG2
44 static void dump_cifs_file_struct(struct file
*file
, char *label
)
46 struct cifsFileInfo
*cf
;
49 cf
= file
->private_data
;
51 cifs_dbg(FYI
, "empty cifs private file data\n");
54 if (cf
->invalidHandle
)
55 cifs_dbg(FYI
, "invalid handle\n");
56 if (cf
->srch_inf
.endOfSearch
)
57 cifs_dbg(FYI
, "end of search\n");
58 if (cf
->srch_inf
.emptyDir
)
59 cifs_dbg(FYI
, "empty dir\n");
63 static inline void dump_cifs_file_struct(struct file
*file
, char *label
)
69 * Attempt to preload the dcache with the results from the FIND_FIRST/NEXT
71 * Find the dentry that matches "name". If there isn't one, create one. If it's
72 * a negative dentry or the uniqueid changed, then drop it and recreate it.
75 cifs_prime_dcache(struct dentry
*parent
, struct qstr
*name
,
76 struct cifs_fattr
*fattr
)
78 struct dentry
*dentry
, *alias
;
80 struct super_block
*sb
= parent
->d_inode
->i_sb
;
81 struct cifs_sb_info
*cifs_sb
= CIFS_SB(sb
);
83 cifs_dbg(FYI
, "%s: for %s\n", __func__
, name
->name
);
85 dentry
= d_hash_and_lookup(parent
, name
);
86 if (unlikely(IS_ERR(dentry
)))
90 inode
= dentry
->d_inode
;
93 * If we're generating inode numbers, then we don't
94 * want to clobber the existing one with the one that
95 * the readdir code created.
97 if (!(cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_SERVER_INUM
))
98 fattr
->cf_uniqueid
= CIFS_I(inode
)->uniqueid
;
100 /* update inode in place if i_ino didn't change */
101 if (CIFS_I(inode
)->uniqueid
== fattr
->cf_uniqueid
) {
102 cifs_fattr_to_inode(inode
, fattr
);
106 d_invalidate(dentry
);
111 * If we know that the inode will need to be revalidated immediately,
112 * then don't create a new dentry for it. We'll end up doing an on
113 * the wire call either way and this spares us an invalidation.
115 if (fattr
->cf_flags
& CIFS_FATTR_NEED_REVAL
)
118 dentry
= d_alloc(parent
, name
);
122 inode
= cifs_iget(sb
, fattr
);
126 alias
= d_materialise_unique(dentry
, inode
);
127 if (alias
&& !IS_ERR(alias
))
134 cifs_fill_common_info(struct cifs_fattr
*fattr
, struct cifs_sb_info
*cifs_sb
)
136 fattr
->cf_uid
= cifs_sb
->mnt_uid
;
137 fattr
->cf_gid
= cifs_sb
->mnt_gid
;
139 if (fattr
->cf_cifsattrs
& ATTR_DIRECTORY
) {
140 fattr
->cf_mode
= S_IFDIR
| cifs_sb
->mnt_dir_mode
;
141 fattr
->cf_dtype
= DT_DIR
;
143 fattr
->cf_mode
= S_IFREG
| cifs_sb
->mnt_file_mode
;
144 fattr
->cf_dtype
= DT_REG
;
148 * We need to revalidate it further to make a decision about whether it
149 * is a symbolic link, DFS referral or a reparse point with a direct
150 * access like junctions, deduplicated files, NFS symlinks.
152 if (fattr
->cf_cifsattrs
& ATTR_REPARSE
)
153 fattr
->cf_flags
|= CIFS_FATTR_NEED_REVAL
;
155 /* non-unix readdir doesn't provide nlink */
156 fattr
->cf_flags
|= CIFS_FATTR_UNKNOWN_NLINK
;
158 if (fattr
->cf_cifsattrs
& ATTR_READONLY
)
159 fattr
->cf_mode
&= ~S_IWUGO
;
162 * We of course don't get ACL info in FIND_FIRST/NEXT results, so
163 * mark it for revalidation so that "ls -l" will look right. It might
164 * be super-slow, but if we don't do this then the ownership of files
165 * may look wrong since the inodes may not have timed out by the time
166 * "ls" does a stat() call on them.
168 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_CIFS_ACL
)
169 fattr
->cf_flags
|= CIFS_FATTR_NEED_REVAL
;
171 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_UNX_EMUL
&&
172 fattr
->cf_cifsattrs
& ATTR_SYSTEM
) {
173 if (fattr
->cf_eof
== 0) {
174 fattr
->cf_mode
&= ~S_IFMT
;
175 fattr
->cf_mode
|= S_IFIFO
;
176 fattr
->cf_dtype
= DT_FIFO
;
179 * trying to get the type and mode via SFU can be slow,
180 * so just call those regular files for now, and mark
183 fattr
->cf_flags
|= CIFS_FATTR_NEED_REVAL
;
189 cifs_dir_info_to_fattr(struct cifs_fattr
*fattr
, FILE_DIRECTORY_INFO
*info
,
190 struct cifs_sb_info
*cifs_sb
)
192 memset(fattr
, 0, sizeof(*fattr
));
193 fattr
->cf_cifsattrs
= le32_to_cpu(info
->ExtFileAttributes
);
194 fattr
->cf_eof
= le64_to_cpu(info
->EndOfFile
);
195 fattr
->cf_bytes
= le64_to_cpu(info
->AllocationSize
);
196 fattr
->cf_createtime
= le64_to_cpu(info
->CreationTime
);
197 fattr
->cf_atime
= cifs_NTtimeToUnix(info
->LastAccessTime
);
198 fattr
->cf_ctime
= cifs_NTtimeToUnix(info
->ChangeTime
);
199 fattr
->cf_mtime
= cifs_NTtimeToUnix(info
->LastWriteTime
);
201 cifs_fill_common_info(fattr
, cifs_sb
);
205 cifs_std_info_to_fattr(struct cifs_fattr
*fattr
, FIND_FILE_STANDARD_INFO
*info
,
206 struct cifs_sb_info
*cifs_sb
)
208 int offset
= cifs_sb_master_tcon(cifs_sb
)->ses
->server
->timeAdj
;
210 memset(fattr
, 0, sizeof(*fattr
));
211 fattr
->cf_atime
= cnvrtDosUnixTm(info
->LastAccessDate
,
212 info
->LastAccessTime
, offset
);
213 fattr
->cf_ctime
= cnvrtDosUnixTm(info
->LastWriteDate
,
214 info
->LastWriteTime
, offset
);
215 fattr
->cf_mtime
= cnvrtDosUnixTm(info
->LastWriteDate
,
216 info
->LastWriteTime
, offset
);
218 fattr
->cf_cifsattrs
= le16_to_cpu(info
->Attributes
);
219 fattr
->cf_bytes
= le32_to_cpu(info
->AllocationSize
);
220 fattr
->cf_eof
= le32_to_cpu(info
->DataSize
);
222 cifs_fill_common_info(fattr
, cifs_sb
);
225 /* BB eventually need to add the following helper function to
226 resolve NT_STATUS_STOPPED_ON_SYMLINK return code when
227 we try to do FindFirst on (NTFS) directory symlinks */
229 int get_symlink_reparse_path(char *full_path, struct cifs_sb_info *cifs_sb,
236 struct cifs_tcon *ptcon = cifs_sb_tcon(cifs_sb);
239 rc = CIFSSMBOpen(xid, ptcon, full_path, FILE_OPEN, GENERIC_READ,
240 OPEN_REPARSE_POINT, &fid, &oplock, NULL,
244 tmpbuffer = kmalloc(maxpath);
245 rc = CIFSSMBQueryReparseLinkInfo(xid, ptcon, full_path,
250 if (CIFSSMBClose(xid, ptcon, fid)) {
251 cifs_dbg(FYI, "Error closing temporary reparsepoint open\n");
258 initiate_cifs_search(const unsigned int xid
, struct file
*file
)
262 char *full_path
= NULL
;
263 struct cifsFileInfo
*cifsFile
;
264 struct cifs_sb_info
*cifs_sb
= CIFS_SB(file
->f_path
.dentry
->d_sb
);
265 struct tcon_link
*tlink
= NULL
;
266 struct cifs_tcon
*tcon
;
267 struct TCP_Server_Info
*server
;
269 if (file
->private_data
== NULL
) {
270 tlink
= cifs_sb_tlink(cifs_sb
);
272 return PTR_ERR(tlink
);
274 cifsFile
= kzalloc(sizeof(struct cifsFileInfo
), GFP_KERNEL
);
275 if (cifsFile
== NULL
) {
279 file
->private_data
= cifsFile
;
280 cifsFile
->tlink
= cifs_get_tlink(tlink
);
281 tcon
= tlink_tcon(tlink
);
283 cifsFile
= file
->private_data
;
284 tcon
= tlink_tcon(cifsFile
->tlink
);
287 server
= tcon
->ses
->server
;
289 if (!server
->ops
->query_dir_first
) {
294 cifsFile
->invalidHandle
= true;
295 cifsFile
->srch_inf
.endOfSearch
= false;
297 full_path
= build_path_from_dentry(file
->f_path
.dentry
);
298 if (full_path
== NULL
) {
303 cifs_dbg(FYI
, "Full path: %s start at: %lld\n", full_path
, file
->f_pos
);
306 /* test for Unix extensions */
307 /* but now check for them on the share/mount not on the SMB session */
308 /* if (cap_unix(tcon->ses) { */
310 cifsFile
->srch_inf
.info_level
= SMB_FIND_FILE_UNIX
;
311 else if ((tcon
->ses
->capabilities
&
312 tcon
->ses
->server
->vals
->cap_nt_find
) == 0) {
313 cifsFile
->srch_inf
.info_level
= SMB_FIND_FILE_INFO_STANDARD
;
314 } else if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_SERVER_INUM
) {
315 cifsFile
->srch_inf
.info_level
= SMB_FIND_FILE_ID_FULL_DIR_INFO
;
316 } else /* not srvinos - BB fixme add check for backlevel? */ {
317 cifsFile
->srch_inf
.info_level
= SMB_FIND_FILE_DIRECTORY_INFO
;
320 search_flags
= CIFS_SEARCH_CLOSE_AT_END
| CIFS_SEARCH_RETURN_RESUME
;
321 if (backup_cred(cifs_sb
))
322 search_flags
|= CIFS_SEARCH_BACKUP_SEARCH
;
324 rc
= server
->ops
->query_dir_first(xid
, tcon
, full_path
, cifs_sb
,
325 &cifsFile
->fid
, search_flags
,
326 &cifsFile
->srch_inf
);
329 cifsFile
->invalidHandle
= false;
330 /* BB add following call to handle readdir on new NTFS symlink errors
331 else if STATUS_STOPPED_ON_SYMLINK
332 call get_symlink_reparse_path and retry with new path */
333 else if ((rc
== -EOPNOTSUPP
) &&
334 (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_SERVER_INUM
)) {
335 cifs_sb
->mnt_cifs_flags
&= ~CIFS_MOUNT_SERVER_INUM
;
340 cifs_put_tlink(tlink
);
344 /* return length of unicode string in bytes */
345 static int cifs_unicode_bytelen(const char *str
)
348 const __le16
*ustr
= (const __le16
*)str
;
350 for (len
= 0; len
<= PATH_MAX
; len
++) {
354 cifs_dbg(FYI
, "Unicode string longer than PATH_MAX found\n");
358 static char *nxt_dir_entry(char *old_entry
, char *end_of_smb
, int level
)
361 FILE_DIRECTORY_INFO
*pDirInfo
= (FILE_DIRECTORY_INFO
*)old_entry
;
363 if (level
== SMB_FIND_FILE_INFO_STANDARD
) {
364 FIND_FILE_STANDARD_INFO
*pfData
;
365 pfData
= (FIND_FILE_STANDARD_INFO
*)pDirInfo
;
367 new_entry
= old_entry
+ sizeof(FIND_FILE_STANDARD_INFO
) +
368 pfData
->FileNameLength
;
370 new_entry
= old_entry
+ le32_to_cpu(pDirInfo
->NextEntryOffset
);
371 cifs_dbg(FYI
, "new entry %p old entry %p\n", new_entry
, old_entry
);
372 /* validate that new_entry is not past end of SMB */
373 if (new_entry
>= end_of_smb
) {
374 cifs_dbg(VFS
, "search entry %p began after end of SMB %p old entry %p\n",
375 new_entry
, end_of_smb
, old_entry
);
377 } else if (((level
== SMB_FIND_FILE_INFO_STANDARD
) &&
378 (new_entry
+ sizeof(FIND_FILE_STANDARD_INFO
) > end_of_smb
))
379 || ((level
!= SMB_FIND_FILE_INFO_STANDARD
) &&
380 (new_entry
+ sizeof(FILE_DIRECTORY_INFO
) > end_of_smb
))) {
381 cifs_dbg(VFS
, "search entry %p extends after end of SMB %p\n",
382 new_entry
, end_of_smb
);
396 static void cifs_fill_dirent_unix(struct cifs_dirent
*de
,
397 const FILE_UNIX_INFO
*info
, bool is_unicode
)
399 de
->name
= &info
->FileName
[0];
401 de
->namelen
= cifs_unicode_bytelen(de
->name
);
403 de
->namelen
= strnlen(de
->name
, PATH_MAX
);
404 de
->resume_key
= info
->ResumeKey
;
405 de
->ino
= le64_to_cpu(info
->basic
.UniqueId
);
408 static void cifs_fill_dirent_dir(struct cifs_dirent
*de
,
409 const FILE_DIRECTORY_INFO
*info
)
411 de
->name
= &info
->FileName
[0];
412 de
->namelen
= le32_to_cpu(info
->FileNameLength
);
413 de
->resume_key
= info
->FileIndex
;
416 static void cifs_fill_dirent_full(struct cifs_dirent
*de
,
417 const FILE_FULL_DIRECTORY_INFO
*info
)
419 de
->name
= &info
->FileName
[0];
420 de
->namelen
= le32_to_cpu(info
->FileNameLength
);
421 de
->resume_key
= info
->FileIndex
;
424 static void cifs_fill_dirent_search(struct cifs_dirent
*de
,
425 const SEARCH_ID_FULL_DIR_INFO
*info
)
427 de
->name
= &info
->FileName
[0];
428 de
->namelen
= le32_to_cpu(info
->FileNameLength
);
429 de
->resume_key
= info
->FileIndex
;
430 de
->ino
= le64_to_cpu(info
->UniqueId
);
433 static void cifs_fill_dirent_both(struct cifs_dirent
*de
,
434 const FILE_BOTH_DIRECTORY_INFO
*info
)
436 de
->name
= &info
->FileName
[0];
437 de
->namelen
= le32_to_cpu(info
->FileNameLength
);
438 de
->resume_key
= info
->FileIndex
;
441 static void cifs_fill_dirent_std(struct cifs_dirent
*de
,
442 const FIND_FILE_STANDARD_INFO
*info
)
444 de
->name
= &info
->FileName
[0];
445 /* one byte length, no endianess conversion */
446 de
->namelen
= info
->FileNameLength
;
447 de
->resume_key
= info
->ResumeKey
;
450 static int cifs_fill_dirent(struct cifs_dirent
*de
, const void *info
,
451 u16 level
, bool is_unicode
)
453 memset(de
, 0, sizeof(*de
));
456 case SMB_FIND_FILE_UNIX
:
457 cifs_fill_dirent_unix(de
, info
, is_unicode
);
459 case SMB_FIND_FILE_DIRECTORY_INFO
:
460 cifs_fill_dirent_dir(de
, info
);
462 case SMB_FIND_FILE_FULL_DIRECTORY_INFO
:
463 cifs_fill_dirent_full(de
, info
);
465 case SMB_FIND_FILE_ID_FULL_DIR_INFO
:
466 cifs_fill_dirent_search(de
, info
);
468 case SMB_FIND_FILE_BOTH_DIRECTORY_INFO
:
469 cifs_fill_dirent_both(de
, info
);
471 case SMB_FIND_FILE_INFO_STANDARD
:
472 cifs_fill_dirent_std(de
, info
);
475 cifs_dbg(FYI
, "Unknown findfirst level %d\n", level
);
482 #define UNICODE_DOT cpu_to_le16(0x2e)
484 /* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
485 static int cifs_entry_is_dot(struct cifs_dirent
*de
, bool is_unicode
)
493 __le16
*ufilename
= (__le16
*)de
->name
;
494 if (de
->namelen
== 2) {
496 if (ufilename
[0] == UNICODE_DOT
)
498 } else if (de
->namelen
== 4) {
500 if (ufilename
[0] == UNICODE_DOT
&&
501 ufilename
[1] == UNICODE_DOT
)
505 if (de
->namelen
== 1) {
506 if (de
->name
[0] == '.')
508 } else if (de
->namelen
== 2) {
509 if (de
->name
[0] == '.' && de
->name
[1] == '.')
517 /* Check if directory that we are searching has changed so we can decide
518 whether we can use the cached search results from the previous search */
519 static int is_dir_changed(struct file
*file
)
521 struct inode
*inode
= file_inode(file
);
522 struct cifsInodeInfo
*cifsInfo
= CIFS_I(inode
);
524 if (cifsInfo
->time
== 0)
525 return 1; /* directory was changed, perhaps due to unlink */
531 static int cifs_save_resume_key(const char *current_entry
,
532 struct cifsFileInfo
*file_info
)
534 struct cifs_dirent de
;
537 rc
= cifs_fill_dirent(&de
, current_entry
, file_info
->srch_inf
.info_level
,
538 file_info
->srch_inf
.unicode
);
540 file_info
->srch_inf
.presume_name
= de
.name
;
541 file_info
->srch_inf
.resume_name_len
= de
.namelen
;
542 file_info
->srch_inf
.resume_key
= de
.resume_key
;
548 * Find the corresponding entry in the search. Note that the SMB server returns
549 * search entries for . and .. which complicates logic here if we choose to
550 * parse for them and we do not assume that they are located in the findfirst
551 * return buffer. We start counting in the buffer with entry 2 and increment for
552 * every entry (do not increment for . or .. entry).
555 find_cifs_entry(const unsigned int xid
, struct cifs_tcon
*tcon
, loff_t pos
,
556 struct file
*file
, char **current_entry
, int *num_to_ret
)
561 loff_t first_entry_in_buffer
;
562 loff_t index_to_find
= pos
;
563 struct cifsFileInfo
*cfile
= file
->private_data
;
564 struct cifs_sb_info
*cifs_sb
= CIFS_SB(file
->f_path
.dentry
->d_sb
);
565 struct TCP_Server_Info
*server
= tcon
->ses
->server
;
566 /* check if index in the buffer */
568 if (!server
->ops
->query_dir_first
|| !server
->ops
->query_dir_next
)
571 if ((cfile
== NULL
) || (current_entry
== NULL
) || (num_to_ret
== NULL
))
574 *current_entry
= NULL
;
575 first_entry_in_buffer
= cfile
->srch_inf
.index_of_last_entry
-
576 cfile
->srch_inf
.entries_in_buffer
;
579 * If first entry in buf is zero then is first buffer
580 * in search response data which means it is likely . and ..
581 * will be in this buffer, although some servers do not return
582 * . and .. for the root of a drive and for those we need
583 * to start two entries earlier.
586 dump_cifs_file_struct(file
, "In fce ");
587 if (((index_to_find
< cfile
->srch_inf
.index_of_last_entry
) &&
588 is_dir_changed(file
)) || (index_to_find
< first_entry_in_buffer
)) {
589 /* close and restart search */
590 cifs_dbg(FYI
, "search backing up - close and restart search\n");
591 spin_lock(&cifs_file_list_lock
);
592 if (server
->ops
->dir_needs_close(cfile
)) {
593 cfile
->invalidHandle
= true;
594 spin_unlock(&cifs_file_list_lock
);
595 if (server
->ops
->close_dir
)
596 server
->ops
->close_dir(xid
, tcon
, &cfile
->fid
);
598 spin_unlock(&cifs_file_list_lock
);
599 if (cfile
->srch_inf
.ntwrk_buf_start
) {
600 cifs_dbg(FYI
, "freeing SMB ff cache buf on search rewind\n");
601 if (cfile
->srch_inf
.smallBuf
)
602 cifs_small_buf_release(cfile
->srch_inf
.
605 cifs_buf_release(cfile
->srch_inf
.
607 cfile
->srch_inf
.ntwrk_buf_start
= NULL
;
609 rc
= initiate_cifs_search(xid
, file
);
611 cifs_dbg(FYI
, "error %d reinitiating a search on rewind\n",
615 /* FindFirst/Next set last_entry to NULL on malformed reply */
616 if (cfile
->srch_inf
.last_entry
)
617 cifs_save_resume_key(cfile
->srch_inf
.last_entry
, cfile
);
620 search_flags
= CIFS_SEARCH_CLOSE_AT_END
| CIFS_SEARCH_RETURN_RESUME
;
621 if (backup_cred(cifs_sb
))
622 search_flags
|= CIFS_SEARCH_BACKUP_SEARCH
;
624 while ((index_to_find
>= cfile
->srch_inf
.index_of_last_entry
) &&
625 (rc
== 0) && !cfile
->srch_inf
.endOfSearch
) {
626 cifs_dbg(FYI
, "calling findnext2\n");
627 rc
= server
->ops
->query_dir_next(xid
, tcon
, &cfile
->fid
,
630 /* FindFirst/Next set last_entry to NULL on malformed reply */
631 if (cfile
->srch_inf
.last_entry
)
632 cifs_save_resume_key(cfile
->srch_inf
.last_entry
, cfile
);
636 if (index_to_find
< cfile
->srch_inf
.index_of_last_entry
) {
637 /* we found the buffer that contains the entry */
638 /* scan and find it */
641 char *end_of_smb
= cfile
->srch_inf
.ntwrk_buf_start
+
642 server
->ops
->calc_smb_size(
643 cfile
->srch_inf
.ntwrk_buf_start
);
645 cur_ent
= cfile
->srch_inf
.srch_entries_start
;
646 first_entry_in_buffer
= cfile
->srch_inf
.index_of_last_entry
647 - cfile
->srch_inf
.entries_in_buffer
;
648 pos_in_buf
= index_to_find
- first_entry_in_buffer
;
649 cifs_dbg(FYI
, "found entry - pos_in_buf %d\n", pos_in_buf
);
651 for (i
= 0; (i
< (pos_in_buf
)) && (cur_ent
!= NULL
); i
++) {
652 /* go entry by entry figuring out which is first */
653 cur_ent
= nxt_dir_entry(cur_ent
, end_of_smb
,
654 cfile
->srch_inf
.info_level
);
656 if ((cur_ent
== NULL
) && (i
< pos_in_buf
)) {
657 /* BB fixme - check if we should flag this error */
658 cifs_dbg(VFS
, "reached end of buf searching for pos in buf %d index to find %lld rc %d\n",
659 pos_in_buf
, index_to_find
, rc
);
662 *current_entry
= cur_ent
;
664 cifs_dbg(FYI
, "index not in buffer - could not findnext into it\n");
668 if (pos_in_buf
>= cfile
->srch_inf
.entries_in_buffer
) {
669 cifs_dbg(FYI
, "can not return entries pos_in_buf beyond last\n");
672 *num_to_ret
= cfile
->srch_inf
.entries_in_buffer
- pos_in_buf
;
677 static int cifs_filldir(char *find_entry
, struct file
*file
,
678 struct dir_context
*ctx
,
679 char *scratch_buf
, unsigned int max_len
)
681 struct cifsFileInfo
*file_info
= file
->private_data
;
682 struct super_block
*sb
= file
->f_path
.dentry
->d_sb
;
683 struct cifs_sb_info
*cifs_sb
= CIFS_SB(sb
);
684 struct cifs_dirent de
= { NULL
, };
685 struct cifs_fattr fattr
;
690 rc
= cifs_fill_dirent(&de
, find_entry
, file_info
->srch_inf
.info_level
,
691 file_info
->srch_inf
.unicode
);
695 if (de
.namelen
> max_len
) {
696 cifs_dbg(VFS
, "bad search response length %zd past smb end\n",
701 /* skip . and .. since we added them first */
702 if (cifs_entry_is_dot(&de
, file_info
->srch_inf
.unicode
))
705 if (file_info
->srch_inf
.unicode
) {
706 struct nls_table
*nlt
= cifs_sb
->local_nls
;
709 map_type
= cifs_remap(cifs_sb
);
710 name
.name
= scratch_buf
;
712 cifs_from_utf16((char *)name
.name
, (__le16
*)de
.name
,
714 min_t(size_t, de
.namelen
,
715 (size_t)max_len
), nlt
, map_type
);
716 name
.len
-= nls_nullsize(nlt
);
719 name
.len
= de
.namelen
;
722 switch (file_info
->srch_inf
.info_level
) {
723 case SMB_FIND_FILE_UNIX
:
724 cifs_unix_basic_to_fattr(&fattr
,
725 &((FILE_UNIX_INFO
*)find_entry
)->basic
,
728 case SMB_FIND_FILE_INFO_STANDARD
:
729 cifs_std_info_to_fattr(&fattr
,
730 (FIND_FILE_STANDARD_INFO
*)find_entry
,
734 cifs_dir_info_to_fattr(&fattr
,
735 (FILE_DIRECTORY_INFO
*)find_entry
,
740 if (de
.ino
&& (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_SERVER_INUM
)) {
741 fattr
.cf_uniqueid
= de
.ino
;
743 fattr
.cf_uniqueid
= iunique(sb
, ROOT_I
);
744 cifs_autodisable_serverino(cifs_sb
);
747 if ((cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_MF_SYMLINKS
) &&
748 couldbe_mf_symlink(&fattr
))
750 * trying to get the type and mode can be slow,
751 * so just call those regular files for now, and mark
754 fattr
.cf_flags
|= CIFS_FATTR_NEED_REVAL
;
756 cifs_prime_dcache(file
->f_dentry
, &name
, &fattr
);
758 ino
= cifs_uniqueid_to_ino_t(fattr
.cf_uniqueid
);
759 return !dir_emit(ctx
, name
.name
, name
.len
, ino
, fattr
.cf_dtype
);
763 int cifs_readdir(struct file
*file
, struct dir_context
*ctx
)
768 struct cifs_tcon
*tcon
;
769 struct cifsFileInfo
*cifsFile
= NULL
;
772 char *tmp_buf
= NULL
;
774 unsigned int max_len
;
779 * Ensure FindFirst doesn't fail before doing filldir() for '.' and
780 * '..'. Otherwise we won't be able to notify VFS in case of failure.
782 if (file
->private_data
== NULL
) {
783 rc
= initiate_cifs_search(xid
, file
);
784 cifs_dbg(FYI
, "initiate cifs search rc %d\n", rc
);
789 if (!dir_emit_dots(file
, ctx
))
792 /* 1) If search is active,
793 is in current search buffer?
794 if it before then restart search
795 if after then keep searching till find it */
797 if (file
->private_data
== NULL
) {
801 cifsFile
= file
->private_data
;
802 if (cifsFile
->srch_inf
.endOfSearch
) {
803 if (cifsFile
->srch_inf
.emptyDir
) {
804 cifs_dbg(FYI
, "End of search, empty dir\n");
809 cifsFile->invalidHandle = true;
810 tcon->ses->server->close(xid, tcon, &cifsFile->fid);
813 tcon
= tlink_tcon(cifsFile
->tlink
);
814 rc
= find_cifs_entry(xid
, tcon
, ctx
->pos
, file
, ¤t_entry
,
817 cifs_dbg(FYI
, "fce error %d\n", rc
);
819 } else if (current_entry
!= NULL
) {
820 cifs_dbg(FYI
, "entry %lld found\n", ctx
->pos
);
822 cifs_dbg(FYI
, "could not find entry\n");
825 cifs_dbg(FYI
, "loop through %d times filling dir for net buf %p\n",
826 num_to_fill
, cifsFile
->srch_inf
.ntwrk_buf_start
);
827 max_len
= tcon
->ses
->server
->ops
->calc_smb_size(
828 cifsFile
->srch_inf
.ntwrk_buf_start
);
829 end_of_smb
= cifsFile
->srch_inf
.ntwrk_buf_start
+ max_len
;
831 tmp_buf
= kmalloc(UNICODE_NAME_MAX
, GFP_KERNEL
);
832 if (tmp_buf
== NULL
) {
837 for (i
= 0; i
< num_to_fill
; i
++) {
838 if (current_entry
== NULL
) {
839 /* evaluate whether this case is an error */
840 cifs_dbg(VFS
, "past SMB end, num to fill %d i %d\n",
845 * if buggy server returns . and .. late do we want to
846 * check for that here?
848 rc
= cifs_filldir(current_entry
, file
, ctx
,
858 cifsFile
->srch_inf
.index_of_last_entry
) {
859 cifs_dbg(FYI
, "last entry in buf at pos %lld %s\n",
861 cifs_save_resume_key(current_entry
, cifsFile
);
865 nxt_dir_entry(current_entry
, end_of_smb
,
866 cifsFile
->srch_inf
.info_level
);