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
)))
92 inode
= dentry
->d_inode
;
95 * If we're generating inode numbers, then we don't
96 * want to clobber the existing one with the one that
97 * the readdir code created.
99 if (!(cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_SERVER_INUM
))
100 fattr
->cf_uniqueid
= CIFS_I(inode
)->uniqueid
;
102 /* update inode in place if i_ino didn't change */
103 if (CIFS_I(inode
)->uniqueid
== fattr
->cf_uniqueid
) {
104 cifs_fattr_to_inode(inode
, fattr
);
108 err
= d_invalidate(dentry
);
115 * If we know that the inode will need to be revalidated immediately,
116 * then don't create a new dentry for it. We'll end up doing an on
117 * the wire call either way and this spares us an invalidation.
119 if (fattr
->cf_flags
& CIFS_FATTR_NEED_REVAL
)
122 dentry
= d_alloc(parent
, name
);
126 inode
= cifs_iget(sb
, fattr
);
130 alias
= d_materialise_unique(dentry
, inode
);
131 if (alias
&& !IS_ERR(alias
))
138 * Is it possible that this directory might turn out to be a DFS referral
139 * once we go to try and use it?
142 cifs_dfs_is_possible(struct cifs_sb_info
*cifs_sb
)
144 #ifdef CONFIG_CIFS_DFS_UPCALL
145 struct cifs_tcon
*tcon
= cifs_sb_master_tcon(cifs_sb
);
147 if (tcon
->Flags
& SMB_SHARE_IS_IN_DFS
)
154 cifs_fill_common_info(struct cifs_fattr
*fattr
, struct cifs_sb_info
*cifs_sb
)
156 fattr
->cf_uid
= cifs_sb
->mnt_uid
;
157 fattr
->cf_gid
= cifs_sb
->mnt_gid
;
159 if (fattr
->cf_cifsattrs
& ATTR_DIRECTORY
) {
160 fattr
->cf_mode
= S_IFDIR
| cifs_sb
->mnt_dir_mode
;
161 fattr
->cf_dtype
= DT_DIR
;
163 * Windows CIFS servers generally make DFS referrals look
164 * like directories in FIND_* responses with the reparse
165 * attribute flag also set (since DFS junctions are
166 * reparse points). We must revalidate at least these
167 * directory inodes before trying to use them (if
168 * they are DFS we will get PATH_NOT_COVERED back
169 * when queried directly and can then try to connect
172 if (cifs_dfs_is_possible(cifs_sb
) &&
173 (fattr
->cf_cifsattrs
& ATTR_REPARSE
))
174 fattr
->cf_flags
|= CIFS_FATTR_NEED_REVAL
;
175 } else if (fattr
->cf_cifsattrs
& ATTR_REPARSE
) {
176 fattr
->cf_mode
= S_IFLNK
;
177 fattr
->cf_dtype
= DT_LNK
;
179 fattr
->cf_mode
= S_IFREG
| cifs_sb
->mnt_file_mode
;
180 fattr
->cf_dtype
= DT_REG
;
183 if (fattr
->cf_cifsattrs
& ATTR_READONLY
)
184 fattr
->cf_mode
&= ~S_IWUGO
;
187 * We of course don't get ACL info in FIND_FIRST/NEXT results, so
188 * mark it for revalidation so that "ls -l" will look right. It might
189 * be super-slow, but if we don't do this then the ownership of files
190 * may look wrong since the inodes may not have timed out by the time
191 * "ls" does a stat() call on them.
193 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_CIFS_ACL
)
194 fattr
->cf_flags
|= CIFS_FATTR_NEED_REVAL
;
196 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_UNX_EMUL
&&
197 fattr
->cf_cifsattrs
& ATTR_SYSTEM
) {
198 if (fattr
->cf_eof
== 0) {
199 fattr
->cf_mode
&= ~S_IFMT
;
200 fattr
->cf_mode
|= S_IFIFO
;
201 fattr
->cf_dtype
= DT_FIFO
;
204 * trying to get the type and mode via SFU can be slow,
205 * so just call those regular files for now, and mark
208 fattr
->cf_flags
|= CIFS_FATTR_NEED_REVAL
;
214 cifs_dir_info_to_fattr(struct cifs_fattr
*fattr
, FILE_DIRECTORY_INFO
*info
,
215 struct cifs_sb_info
*cifs_sb
)
217 memset(fattr
, 0, sizeof(*fattr
));
218 fattr
->cf_cifsattrs
= le32_to_cpu(info
->ExtFileAttributes
);
219 fattr
->cf_eof
= le64_to_cpu(info
->EndOfFile
);
220 fattr
->cf_bytes
= le64_to_cpu(info
->AllocationSize
);
221 fattr
->cf_createtime
= le64_to_cpu(info
->CreationTime
);
222 fattr
->cf_atime
= cifs_NTtimeToUnix(info
->LastAccessTime
);
223 fattr
->cf_ctime
= cifs_NTtimeToUnix(info
->ChangeTime
);
224 fattr
->cf_mtime
= cifs_NTtimeToUnix(info
->LastWriteTime
);
226 cifs_fill_common_info(fattr
, cifs_sb
);
230 cifs_std_info_to_fattr(struct cifs_fattr
*fattr
, FIND_FILE_STANDARD_INFO
*info
,
231 struct cifs_sb_info
*cifs_sb
)
233 int offset
= cifs_sb_master_tcon(cifs_sb
)->ses
->server
->timeAdj
;
235 memset(fattr
, 0, sizeof(*fattr
));
236 fattr
->cf_atime
= cnvrtDosUnixTm(info
->LastAccessDate
,
237 info
->LastAccessTime
, offset
);
238 fattr
->cf_ctime
= cnvrtDosUnixTm(info
->LastWriteDate
,
239 info
->LastWriteTime
, offset
);
240 fattr
->cf_mtime
= cnvrtDosUnixTm(info
->LastWriteDate
,
241 info
->LastWriteTime
, offset
);
243 fattr
->cf_cifsattrs
= le16_to_cpu(info
->Attributes
);
244 fattr
->cf_bytes
= le32_to_cpu(info
->AllocationSize
);
245 fattr
->cf_eof
= le32_to_cpu(info
->DataSize
);
247 cifs_fill_common_info(fattr
, cifs_sb
);
250 /* BB eventually need to add the following helper function to
251 resolve NT_STATUS_STOPPED_ON_SYMLINK return code when
252 we try to do FindFirst on (NTFS) directory symlinks */
254 int get_symlink_reparse_path(char *full_path, struct cifs_sb_info *cifs_sb,
261 struct cifs_tcon *ptcon = cifs_sb_tcon(cifs_sb);
264 rc = CIFSSMBOpen(xid, ptcon, full_path, FILE_OPEN, GENERIC_READ,
265 OPEN_REPARSE_POINT, &fid, &oplock, NULL,
267 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
269 tmpbuffer = kmalloc(maxpath);
270 rc = CIFSSMBQueryReparseLinkInfo(xid, ptcon, full_path,
275 if (CIFSSMBClose(xid, ptcon, fid)) {
276 cifs_dbg(FYI, "Error closing temporary reparsepoint open\n");
283 initiate_cifs_search(const unsigned int xid
, struct file
*file
)
287 char *full_path
= NULL
;
288 struct cifsFileInfo
*cifsFile
;
289 struct cifs_sb_info
*cifs_sb
= CIFS_SB(file
->f_path
.dentry
->d_sb
);
290 struct tcon_link
*tlink
= NULL
;
291 struct cifs_tcon
*tcon
;
292 struct TCP_Server_Info
*server
;
294 if (file
->private_data
== NULL
) {
295 tlink
= cifs_sb_tlink(cifs_sb
);
297 return PTR_ERR(tlink
);
299 cifsFile
= kzalloc(sizeof(struct cifsFileInfo
), GFP_KERNEL
);
300 if (cifsFile
== NULL
) {
304 file
->private_data
= cifsFile
;
305 cifsFile
->tlink
= cifs_get_tlink(tlink
);
306 tcon
= tlink_tcon(tlink
);
308 cifsFile
= file
->private_data
;
309 tcon
= tlink_tcon(cifsFile
->tlink
);
312 server
= tcon
->ses
->server
;
314 if (!server
->ops
->query_dir_first
) {
319 cifsFile
->invalidHandle
= true;
320 cifsFile
->srch_inf
.endOfSearch
= false;
322 full_path
= build_path_from_dentry(file
->f_path
.dentry
);
323 if (full_path
== NULL
) {
328 cifs_dbg(FYI
, "Full path: %s start at: %lld\n", full_path
, file
->f_pos
);
331 /* test for Unix extensions */
332 /* but now check for them on the share/mount not on the SMB session */
333 /* if (cap_unix(tcon->ses) { */
335 cifsFile
->srch_inf
.info_level
= SMB_FIND_FILE_UNIX
;
336 else if ((tcon
->ses
->capabilities
&
337 tcon
->ses
->server
->vals
->cap_nt_find
) == 0) {
338 cifsFile
->srch_inf
.info_level
= SMB_FIND_FILE_INFO_STANDARD
;
339 } else if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_SERVER_INUM
) {
340 cifsFile
->srch_inf
.info_level
= SMB_FIND_FILE_ID_FULL_DIR_INFO
;
341 } else /* not srvinos - BB fixme add check for backlevel? */ {
342 cifsFile
->srch_inf
.info_level
= SMB_FIND_FILE_DIRECTORY_INFO
;
345 search_flags
= CIFS_SEARCH_CLOSE_AT_END
| CIFS_SEARCH_RETURN_RESUME
;
346 if (backup_cred(cifs_sb
))
347 search_flags
|= CIFS_SEARCH_BACKUP_SEARCH
;
349 rc
= server
->ops
->query_dir_first(xid
, tcon
, full_path
, cifs_sb
,
350 &cifsFile
->fid
, search_flags
,
351 &cifsFile
->srch_inf
);
354 cifsFile
->invalidHandle
= false;
355 /* BB add following call to handle readdir on new NTFS symlink errors
356 else if STATUS_STOPPED_ON_SYMLINK
357 call get_symlink_reparse_path and retry with new path */
358 else if ((rc
== -EOPNOTSUPP
) &&
359 (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_SERVER_INUM
)) {
360 cifs_sb
->mnt_cifs_flags
&= ~CIFS_MOUNT_SERVER_INUM
;
365 cifs_put_tlink(tlink
);
369 /* return length of unicode string in bytes */
370 static int cifs_unicode_bytelen(const char *str
)
373 const __le16
*ustr
= (const __le16
*)str
;
375 for (len
= 0; len
<= PATH_MAX
; len
++) {
379 cifs_dbg(FYI
, "Unicode string longer than PATH_MAX found\n");
383 static char *nxt_dir_entry(char *old_entry
, char *end_of_smb
, int level
)
386 FILE_DIRECTORY_INFO
*pDirInfo
= (FILE_DIRECTORY_INFO
*)old_entry
;
388 if (level
== SMB_FIND_FILE_INFO_STANDARD
) {
389 FIND_FILE_STANDARD_INFO
*pfData
;
390 pfData
= (FIND_FILE_STANDARD_INFO
*)pDirInfo
;
392 new_entry
= old_entry
+ sizeof(FIND_FILE_STANDARD_INFO
) +
393 pfData
->FileNameLength
;
395 new_entry
= old_entry
+ le32_to_cpu(pDirInfo
->NextEntryOffset
);
396 cifs_dbg(FYI
, "new entry %p old entry %p\n", new_entry
, old_entry
);
397 /* validate that new_entry is not past end of SMB */
398 if (new_entry
>= end_of_smb
) {
399 cifs_dbg(VFS
, "search entry %p began after end of SMB %p old entry %p\n",
400 new_entry
, end_of_smb
, old_entry
);
402 } else if (((level
== SMB_FIND_FILE_INFO_STANDARD
) &&
403 (new_entry
+ sizeof(FIND_FILE_STANDARD_INFO
) > end_of_smb
))
404 || ((level
!= SMB_FIND_FILE_INFO_STANDARD
) &&
405 (new_entry
+ sizeof(FILE_DIRECTORY_INFO
) > end_of_smb
))) {
406 cifs_dbg(VFS
, "search entry %p extends after end of SMB %p\n",
407 new_entry
, end_of_smb
);
421 static void cifs_fill_dirent_unix(struct cifs_dirent
*de
,
422 const FILE_UNIX_INFO
*info
, bool is_unicode
)
424 de
->name
= &info
->FileName
[0];
426 de
->namelen
= cifs_unicode_bytelen(de
->name
);
428 de
->namelen
= strnlen(de
->name
, PATH_MAX
);
429 de
->resume_key
= info
->ResumeKey
;
430 de
->ino
= le64_to_cpu(info
->basic
.UniqueId
);
433 static void cifs_fill_dirent_dir(struct cifs_dirent
*de
,
434 const FILE_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_full(struct cifs_dirent
*de
,
442 const FILE_FULL_DIRECTORY_INFO
*info
)
444 de
->name
= &info
->FileName
[0];
445 de
->namelen
= le32_to_cpu(info
->FileNameLength
);
446 de
->resume_key
= info
->FileIndex
;
449 static void cifs_fill_dirent_search(struct cifs_dirent
*de
,
450 const SEARCH_ID_FULL_DIR_INFO
*info
)
452 de
->name
= &info
->FileName
[0];
453 de
->namelen
= le32_to_cpu(info
->FileNameLength
);
454 de
->resume_key
= info
->FileIndex
;
455 de
->ino
= le64_to_cpu(info
->UniqueId
);
458 static void cifs_fill_dirent_both(struct cifs_dirent
*de
,
459 const FILE_BOTH_DIRECTORY_INFO
*info
)
461 de
->name
= &info
->FileName
[0];
462 de
->namelen
= le32_to_cpu(info
->FileNameLength
);
463 de
->resume_key
= info
->FileIndex
;
466 static void cifs_fill_dirent_std(struct cifs_dirent
*de
,
467 const FIND_FILE_STANDARD_INFO
*info
)
469 de
->name
= &info
->FileName
[0];
470 /* one byte length, no endianess conversion */
471 de
->namelen
= info
->FileNameLength
;
472 de
->resume_key
= info
->ResumeKey
;
475 static int cifs_fill_dirent(struct cifs_dirent
*de
, const void *info
,
476 u16 level
, bool is_unicode
)
478 memset(de
, 0, sizeof(*de
));
481 case SMB_FIND_FILE_UNIX
:
482 cifs_fill_dirent_unix(de
, info
, is_unicode
);
484 case SMB_FIND_FILE_DIRECTORY_INFO
:
485 cifs_fill_dirent_dir(de
, info
);
487 case SMB_FIND_FILE_FULL_DIRECTORY_INFO
:
488 cifs_fill_dirent_full(de
, info
);
490 case SMB_FIND_FILE_ID_FULL_DIR_INFO
:
491 cifs_fill_dirent_search(de
, info
);
493 case SMB_FIND_FILE_BOTH_DIRECTORY_INFO
:
494 cifs_fill_dirent_both(de
, info
);
496 case SMB_FIND_FILE_INFO_STANDARD
:
497 cifs_fill_dirent_std(de
, info
);
500 cifs_dbg(FYI
, "Unknown findfirst level %d\n", level
);
507 #define UNICODE_DOT cpu_to_le16(0x2e)
509 /* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
510 static int cifs_entry_is_dot(struct cifs_dirent
*de
, bool is_unicode
)
518 __le16
*ufilename
= (__le16
*)de
->name
;
519 if (de
->namelen
== 2) {
521 if (ufilename
[0] == UNICODE_DOT
)
523 } else if (de
->namelen
== 4) {
525 if (ufilename
[0] == UNICODE_DOT
&&
526 ufilename
[1] == UNICODE_DOT
)
530 if (de
->namelen
== 1) {
531 if (de
->name
[0] == '.')
533 } else if (de
->namelen
== 2) {
534 if (de
->name
[0] == '.' && de
->name
[1] == '.')
542 /* Check if directory that we are searching has changed so we can decide
543 whether we can use the cached search results from the previous search */
544 static int is_dir_changed(struct file
*file
)
546 struct inode
*inode
= file_inode(file
);
547 struct cifsInodeInfo
*cifsInfo
= CIFS_I(inode
);
549 if (cifsInfo
->time
== 0)
550 return 1; /* directory was changed, perhaps due to unlink */
556 static int cifs_save_resume_key(const char *current_entry
,
557 struct cifsFileInfo
*file_info
)
559 struct cifs_dirent de
;
562 rc
= cifs_fill_dirent(&de
, current_entry
, file_info
->srch_inf
.info_level
,
563 file_info
->srch_inf
.unicode
);
565 file_info
->srch_inf
.presume_name
= de
.name
;
566 file_info
->srch_inf
.resume_name_len
= de
.namelen
;
567 file_info
->srch_inf
.resume_key
= de
.resume_key
;
573 * Find the corresponding entry in the search. Note that the SMB server returns
574 * search entries for . and .. which complicates logic here if we choose to
575 * parse for them and we do not assume that they are located in the findfirst
576 * return buffer. We start counting in the buffer with entry 2 and increment for
577 * every entry (do not increment for . or .. entry).
580 find_cifs_entry(const unsigned int xid
, struct cifs_tcon
*tcon
, loff_t pos
,
581 struct file
*file
, char **current_entry
, int *num_to_ret
)
586 loff_t first_entry_in_buffer
;
587 loff_t index_to_find
= pos
;
588 struct cifsFileInfo
*cfile
= file
->private_data
;
589 struct cifs_sb_info
*cifs_sb
= CIFS_SB(file
->f_path
.dentry
->d_sb
);
590 struct TCP_Server_Info
*server
= tcon
->ses
->server
;
591 /* check if index in the buffer */
593 if (!server
->ops
->query_dir_first
|| !server
->ops
->query_dir_next
)
596 if ((cfile
== NULL
) || (current_entry
== NULL
) || (num_to_ret
== NULL
))
599 *current_entry
= NULL
;
600 first_entry_in_buffer
= cfile
->srch_inf
.index_of_last_entry
-
601 cfile
->srch_inf
.entries_in_buffer
;
604 * If first entry in buf is zero then is first buffer
605 * in search response data which means it is likely . and ..
606 * will be in this buffer, although some servers do not return
607 * . and .. for the root of a drive and for those we need
608 * to start two entries earlier.
611 dump_cifs_file_struct(file
, "In fce ");
612 if (((index_to_find
< cfile
->srch_inf
.index_of_last_entry
) &&
613 is_dir_changed(file
)) || (index_to_find
< first_entry_in_buffer
)) {
614 /* close and restart search */
615 cifs_dbg(FYI
, "search backing up - close and restart search\n");
616 spin_lock(&cifs_file_list_lock
);
617 if (!cfile
->srch_inf
.endOfSearch
&& !cfile
->invalidHandle
) {
618 cfile
->invalidHandle
= true;
619 spin_unlock(&cifs_file_list_lock
);
620 if (server
->ops
->close
)
621 server
->ops
->close(xid
, tcon
, &cfile
->fid
);
623 spin_unlock(&cifs_file_list_lock
);
624 if (cfile
->srch_inf
.ntwrk_buf_start
) {
625 cifs_dbg(FYI
, "freeing SMB ff cache buf on search rewind\n");
626 if (cfile
->srch_inf
.smallBuf
)
627 cifs_small_buf_release(cfile
->srch_inf
.
630 cifs_buf_release(cfile
->srch_inf
.
632 cfile
->srch_inf
.ntwrk_buf_start
= NULL
;
634 rc
= initiate_cifs_search(xid
, file
);
636 cifs_dbg(FYI
, "error %d reinitiating a search on rewind\n",
640 /* FindFirst/Next set last_entry to NULL on malformed reply */
641 if (cfile
->srch_inf
.last_entry
)
642 cifs_save_resume_key(cfile
->srch_inf
.last_entry
, cfile
);
645 search_flags
= CIFS_SEARCH_CLOSE_AT_END
| CIFS_SEARCH_RETURN_RESUME
;
646 if (backup_cred(cifs_sb
))
647 search_flags
|= CIFS_SEARCH_BACKUP_SEARCH
;
649 while ((index_to_find
>= cfile
->srch_inf
.index_of_last_entry
) &&
650 (rc
== 0) && !cfile
->srch_inf
.endOfSearch
) {
651 cifs_dbg(FYI
, "calling findnext2\n");
652 rc
= server
->ops
->query_dir_next(xid
, tcon
, &cfile
->fid
,
655 /* FindFirst/Next set last_entry to NULL on malformed reply */
656 if (cfile
->srch_inf
.last_entry
)
657 cifs_save_resume_key(cfile
->srch_inf
.last_entry
, cfile
);
661 if (index_to_find
< cfile
->srch_inf
.index_of_last_entry
) {
662 /* we found the buffer that contains the entry */
663 /* scan and find it */
666 char *end_of_smb
= cfile
->srch_inf
.ntwrk_buf_start
+
667 server
->ops
->calc_smb_size(
668 cfile
->srch_inf
.ntwrk_buf_start
);
670 cur_ent
= cfile
->srch_inf
.srch_entries_start
;
671 first_entry_in_buffer
= cfile
->srch_inf
.index_of_last_entry
672 - cfile
->srch_inf
.entries_in_buffer
;
673 pos_in_buf
= index_to_find
- first_entry_in_buffer
;
674 cifs_dbg(FYI
, "found entry - pos_in_buf %d\n", pos_in_buf
);
676 for (i
= 0; (i
< (pos_in_buf
)) && (cur_ent
!= NULL
); i
++) {
677 /* go entry by entry figuring out which is first */
678 cur_ent
= nxt_dir_entry(cur_ent
, end_of_smb
,
679 cfile
->srch_inf
.info_level
);
681 if ((cur_ent
== NULL
) && (i
< pos_in_buf
)) {
682 /* BB fixme - check if we should flag this error */
683 cifs_dbg(VFS
, "reached end of buf searching for pos in buf %d index to find %lld rc %d\n",
684 pos_in_buf
, index_to_find
, rc
);
687 *current_entry
= cur_ent
;
689 cifs_dbg(FYI
, "index not in buffer - could not findnext into it\n");
693 if (pos_in_buf
>= cfile
->srch_inf
.entries_in_buffer
) {
694 cifs_dbg(FYI
, "can not return entries pos_in_buf beyond last\n");
697 *num_to_ret
= cfile
->srch_inf
.entries_in_buffer
- pos_in_buf
;
702 static int cifs_filldir(char *find_entry
, struct file
*file
,
703 struct dir_context
*ctx
,
704 char *scratch_buf
, unsigned int max_len
)
706 struct cifsFileInfo
*file_info
= file
->private_data
;
707 struct super_block
*sb
= file
->f_path
.dentry
->d_sb
;
708 struct cifs_sb_info
*cifs_sb
= CIFS_SB(sb
);
709 struct cifs_dirent de
= { NULL
, };
710 struct cifs_fattr fattr
;
715 rc
= cifs_fill_dirent(&de
, find_entry
, file_info
->srch_inf
.info_level
,
716 file_info
->srch_inf
.unicode
);
720 if (de
.namelen
> max_len
) {
721 cifs_dbg(VFS
, "bad search response length %zd past smb end\n",
726 /* skip . and .. since we added them first */
727 if (cifs_entry_is_dot(&de
, file_info
->srch_inf
.unicode
))
730 if (file_info
->srch_inf
.unicode
) {
731 struct nls_table
*nlt
= cifs_sb
->local_nls
;
733 name
.name
= scratch_buf
;
735 cifs_from_utf16((char *)name
.name
, (__le16
*)de
.name
,
737 min_t(size_t, de
.namelen
,
738 (size_t)max_len
), nlt
,
739 cifs_sb
->mnt_cifs_flags
&
740 CIFS_MOUNT_MAP_SPECIAL_CHR
);
741 name
.len
-= nls_nullsize(nlt
);
744 name
.len
= de
.namelen
;
747 switch (file_info
->srch_inf
.info_level
) {
748 case SMB_FIND_FILE_UNIX
:
749 cifs_unix_basic_to_fattr(&fattr
,
750 &((FILE_UNIX_INFO
*)find_entry
)->basic
,
753 case SMB_FIND_FILE_INFO_STANDARD
:
754 cifs_std_info_to_fattr(&fattr
,
755 (FIND_FILE_STANDARD_INFO
*)find_entry
,
759 cifs_dir_info_to_fattr(&fattr
,
760 (FILE_DIRECTORY_INFO
*)find_entry
,
765 if (de
.ino
&& (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_SERVER_INUM
)) {
766 fattr
.cf_uniqueid
= de
.ino
;
768 fattr
.cf_uniqueid
= iunique(sb
, ROOT_I
);
769 cifs_autodisable_serverino(cifs_sb
);
772 if ((cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_MF_SYMLINKS
) &&
773 CIFSCouldBeMFSymlink(&fattr
))
775 * trying to get the type and mode can be slow,
776 * so just call those regular files for now, and mark
779 fattr
.cf_flags
|= CIFS_FATTR_NEED_REVAL
;
781 cifs_prime_dcache(file
->f_dentry
, &name
, &fattr
);
783 ino
= cifs_uniqueid_to_ino_t(fattr
.cf_uniqueid
);
784 return !dir_emit(ctx
, name
.name
, name
.len
, ino
, fattr
.cf_dtype
);
788 int cifs_readdir(struct file
*file
, struct dir_context
*ctx
)
793 struct cifs_tcon
*tcon
;
794 struct cifsFileInfo
*cifsFile
= NULL
;
797 char *tmp_buf
= NULL
;
799 unsigned int max_len
;
804 * Ensure FindFirst doesn't fail before doing filldir() for '.' and
805 * '..'. Otherwise we won't be able to notify VFS in case of failure.
807 if (file
->private_data
== NULL
) {
808 rc
= initiate_cifs_search(xid
, file
);
809 cifs_dbg(FYI
, "initiate cifs search rc %d\n", rc
);
814 if (!dir_emit_dots(file
, ctx
))
817 /* 1) If search is active,
818 is in current search buffer?
819 if it before then restart search
820 if after then keep searching till find it */
822 if (file
->private_data
== NULL
) {
826 cifsFile
= file
->private_data
;
827 if (cifsFile
->srch_inf
.endOfSearch
) {
828 if (cifsFile
->srch_inf
.emptyDir
) {
829 cifs_dbg(FYI
, "End of search, empty dir\n");
834 cifsFile->invalidHandle = true;
835 tcon->ses->server->close(xid, tcon, &cifsFile->fid);
838 tcon
= tlink_tcon(cifsFile
->tlink
);
839 rc
= find_cifs_entry(xid
, tcon
, ctx
->pos
, file
, ¤t_entry
,
842 cifs_dbg(FYI
, "fce error %d\n", rc
);
844 } else if (current_entry
!= NULL
) {
845 cifs_dbg(FYI
, "entry %lld found\n", ctx
->pos
);
847 cifs_dbg(FYI
, "could not find entry\n");
850 cifs_dbg(FYI
, "loop through %d times filling dir for net buf %p\n",
851 num_to_fill
, cifsFile
->srch_inf
.ntwrk_buf_start
);
852 max_len
= tcon
->ses
->server
->ops
->calc_smb_size(
853 cifsFile
->srch_inf
.ntwrk_buf_start
);
854 end_of_smb
= cifsFile
->srch_inf
.ntwrk_buf_start
+ max_len
;
856 tmp_buf
= kmalloc(UNICODE_NAME_MAX
, GFP_KERNEL
);
857 if (tmp_buf
== NULL
) {
862 for (i
= 0; i
< num_to_fill
; i
++) {
863 if (current_entry
== NULL
) {
864 /* evaluate whether this case is an error */
865 cifs_dbg(VFS
, "past SMB end, num to fill %d i %d\n",
870 * if buggy server returns . and .. late do we want to
871 * check for that here?
873 rc
= cifs_filldir(current_entry
, file
, ctx
,
883 cifsFile
->srch_inf
.index_of_last_entry
) {
884 cifs_dbg(FYI
, "last entry in buf at pos %lld %s\n",
886 cifs_save_resume_key(current_entry
, cifsFile
);
890 nxt_dir_entry(current_entry
, end_of_smb
,
891 cifsFile
->srch_inf
.info_level
);