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
;
176 fattr
->cf_mode
= S_IFREG
| cifs_sb
->mnt_file_mode
;
177 fattr
->cf_dtype
= DT_REG
;
180 if (fattr
->cf_cifsattrs
& ATTR_READONLY
)
181 fattr
->cf_mode
&= ~S_IWUGO
;
184 * We of course don't get ACL info in FIND_FIRST/NEXT results, so
185 * mark it for revalidation so that "ls -l" will look right. It might
186 * be super-slow, but if we don't do this then the ownership of files
187 * may look wrong since the inodes may not have timed out by the time
188 * "ls" does a stat() call on them.
190 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_CIFS_ACL
)
191 fattr
->cf_flags
|= CIFS_FATTR_NEED_REVAL
;
193 if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_UNX_EMUL
&&
194 fattr
->cf_cifsattrs
& ATTR_SYSTEM
) {
195 if (fattr
->cf_eof
== 0) {
196 fattr
->cf_mode
&= ~S_IFMT
;
197 fattr
->cf_mode
|= S_IFIFO
;
198 fattr
->cf_dtype
= DT_FIFO
;
201 * trying to get the type and mode via SFU can be slow,
202 * so just call those regular files for now, and mark
205 fattr
->cf_flags
|= CIFS_FATTR_NEED_REVAL
;
211 cifs_dir_info_to_fattr(struct cifs_fattr
*fattr
, FILE_DIRECTORY_INFO
*info
,
212 struct cifs_sb_info
*cifs_sb
)
214 memset(fattr
, 0, sizeof(*fattr
));
215 fattr
->cf_cifsattrs
= le32_to_cpu(info
->ExtFileAttributes
);
216 fattr
->cf_eof
= le64_to_cpu(info
->EndOfFile
);
217 fattr
->cf_bytes
= le64_to_cpu(info
->AllocationSize
);
218 fattr
->cf_createtime
= le64_to_cpu(info
->CreationTime
);
219 fattr
->cf_atime
= cifs_NTtimeToUnix(info
->LastAccessTime
);
220 fattr
->cf_ctime
= cifs_NTtimeToUnix(info
->ChangeTime
);
221 fattr
->cf_mtime
= cifs_NTtimeToUnix(info
->LastWriteTime
);
223 cifs_fill_common_info(fattr
, cifs_sb
);
227 cifs_std_info_to_fattr(struct cifs_fattr
*fattr
, FIND_FILE_STANDARD_INFO
*info
,
228 struct cifs_sb_info
*cifs_sb
)
230 int offset
= cifs_sb_master_tcon(cifs_sb
)->ses
->server
->timeAdj
;
232 memset(fattr
, 0, sizeof(*fattr
));
233 fattr
->cf_atime
= cnvrtDosUnixTm(info
->LastAccessDate
,
234 info
->LastAccessTime
, offset
);
235 fattr
->cf_ctime
= cnvrtDosUnixTm(info
->LastWriteDate
,
236 info
->LastWriteTime
, offset
);
237 fattr
->cf_mtime
= cnvrtDosUnixTm(info
->LastWriteDate
,
238 info
->LastWriteTime
, offset
);
240 fattr
->cf_cifsattrs
= le16_to_cpu(info
->Attributes
);
241 fattr
->cf_bytes
= le32_to_cpu(info
->AllocationSize
);
242 fattr
->cf_eof
= le32_to_cpu(info
->DataSize
);
244 cifs_fill_common_info(fattr
, cifs_sb
);
247 /* BB eventually need to add the following helper function to
248 resolve NT_STATUS_STOPPED_ON_SYMLINK return code when
249 we try to do FindFirst on (NTFS) directory symlinks */
251 int get_symlink_reparse_path(char *full_path, struct cifs_sb_info *cifs_sb,
258 struct cifs_tcon *ptcon = cifs_sb_tcon(cifs_sb);
261 rc = CIFSSMBOpen(xid, ptcon, full_path, FILE_OPEN, GENERIC_READ,
262 OPEN_REPARSE_POINT, &fid, &oplock, NULL,
264 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
266 tmpbuffer = kmalloc(maxpath);
267 rc = CIFSSMBQueryReparseLinkInfo(xid, ptcon, full_path,
272 if (CIFSSMBClose(xid, ptcon, fid)) {
273 cifs_dbg(FYI, "Error closing temporary reparsepoint open\n");
280 initiate_cifs_search(const unsigned int xid
, struct file
*file
)
284 char *full_path
= NULL
;
285 struct cifsFileInfo
*cifsFile
;
286 struct cifs_sb_info
*cifs_sb
= CIFS_SB(file
->f_path
.dentry
->d_sb
);
287 struct tcon_link
*tlink
= NULL
;
288 struct cifs_tcon
*tcon
;
289 struct TCP_Server_Info
*server
;
291 if (file
->private_data
== NULL
) {
292 tlink
= cifs_sb_tlink(cifs_sb
);
294 return PTR_ERR(tlink
);
296 cifsFile
= kzalloc(sizeof(struct cifsFileInfo
), GFP_KERNEL
);
297 if (cifsFile
== NULL
) {
301 file
->private_data
= cifsFile
;
302 cifsFile
->tlink
= cifs_get_tlink(tlink
);
303 tcon
= tlink_tcon(tlink
);
305 cifsFile
= file
->private_data
;
306 tcon
= tlink_tcon(cifsFile
->tlink
);
309 server
= tcon
->ses
->server
;
311 if (!server
->ops
->query_dir_first
) {
316 cifsFile
->invalidHandle
= true;
317 cifsFile
->srch_inf
.endOfSearch
= false;
319 full_path
= build_path_from_dentry(file
->f_path
.dentry
);
320 if (full_path
== NULL
) {
325 cifs_dbg(FYI
, "Full path: %s start at: %lld\n", full_path
, file
->f_pos
);
328 /* test for Unix extensions */
329 /* but now check for them on the share/mount not on the SMB session */
330 /* if (cap_unix(tcon->ses) { */
332 cifsFile
->srch_inf
.info_level
= SMB_FIND_FILE_UNIX
;
333 else if ((tcon
->ses
->capabilities
&
334 tcon
->ses
->server
->vals
->cap_nt_find
) == 0) {
335 cifsFile
->srch_inf
.info_level
= SMB_FIND_FILE_INFO_STANDARD
;
336 } else if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_SERVER_INUM
) {
337 cifsFile
->srch_inf
.info_level
= SMB_FIND_FILE_ID_FULL_DIR_INFO
;
338 } else /* not srvinos - BB fixme add check for backlevel? */ {
339 cifsFile
->srch_inf
.info_level
= SMB_FIND_FILE_DIRECTORY_INFO
;
342 search_flags
= CIFS_SEARCH_CLOSE_AT_END
| CIFS_SEARCH_RETURN_RESUME
;
343 if (backup_cred(cifs_sb
))
344 search_flags
|= CIFS_SEARCH_BACKUP_SEARCH
;
346 rc
= server
->ops
->query_dir_first(xid
, tcon
, full_path
, cifs_sb
,
347 &cifsFile
->fid
, search_flags
,
348 &cifsFile
->srch_inf
);
351 cifsFile
->invalidHandle
= false;
352 /* BB add following call to handle readdir on new NTFS symlink errors
353 else if STATUS_STOPPED_ON_SYMLINK
354 call get_symlink_reparse_path and retry with new path */
355 else if ((rc
== -EOPNOTSUPP
) &&
356 (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_SERVER_INUM
)) {
357 cifs_sb
->mnt_cifs_flags
&= ~CIFS_MOUNT_SERVER_INUM
;
362 cifs_put_tlink(tlink
);
366 /* return length of unicode string in bytes */
367 static int cifs_unicode_bytelen(const char *str
)
370 const __le16
*ustr
= (const __le16
*)str
;
372 for (len
= 0; len
<= PATH_MAX
; len
++) {
376 cifs_dbg(FYI
, "Unicode string longer than PATH_MAX found\n");
380 static char *nxt_dir_entry(char *old_entry
, char *end_of_smb
, int level
)
383 FILE_DIRECTORY_INFO
*pDirInfo
= (FILE_DIRECTORY_INFO
*)old_entry
;
385 if (level
== SMB_FIND_FILE_INFO_STANDARD
) {
386 FIND_FILE_STANDARD_INFO
*pfData
;
387 pfData
= (FIND_FILE_STANDARD_INFO
*)pDirInfo
;
389 new_entry
= old_entry
+ sizeof(FIND_FILE_STANDARD_INFO
) +
390 pfData
->FileNameLength
;
392 new_entry
= old_entry
+ le32_to_cpu(pDirInfo
->NextEntryOffset
);
393 cifs_dbg(FYI
, "new entry %p old entry %p\n", new_entry
, old_entry
);
394 /* validate that new_entry is not past end of SMB */
395 if (new_entry
>= end_of_smb
) {
396 cifs_dbg(VFS
, "search entry %p began after end of SMB %p old entry %p\n",
397 new_entry
, end_of_smb
, old_entry
);
399 } else if (((level
== SMB_FIND_FILE_INFO_STANDARD
) &&
400 (new_entry
+ sizeof(FIND_FILE_STANDARD_INFO
) > end_of_smb
))
401 || ((level
!= SMB_FIND_FILE_INFO_STANDARD
) &&
402 (new_entry
+ sizeof(FILE_DIRECTORY_INFO
) > end_of_smb
))) {
403 cifs_dbg(VFS
, "search entry %p extends after end of SMB %p\n",
404 new_entry
, end_of_smb
);
418 static void cifs_fill_dirent_unix(struct cifs_dirent
*de
,
419 const FILE_UNIX_INFO
*info
, bool is_unicode
)
421 de
->name
= &info
->FileName
[0];
423 de
->namelen
= cifs_unicode_bytelen(de
->name
);
425 de
->namelen
= strnlen(de
->name
, PATH_MAX
);
426 de
->resume_key
= info
->ResumeKey
;
427 de
->ino
= le64_to_cpu(info
->basic
.UniqueId
);
430 static void cifs_fill_dirent_dir(struct cifs_dirent
*de
,
431 const FILE_DIRECTORY_INFO
*info
)
433 de
->name
= &info
->FileName
[0];
434 de
->namelen
= le32_to_cpu(info
->FileNameLength
);
435 de
->resume_key
= info
->FileIndex
;
438 static void cifs_fill_dirent_full(struct cifs_dirent
*de
,
439 const FILE_FULL_DIRECTORY_INFO
*info
)
441 de
->name
= &info
->FileName
[0];
442 de
->namelen
= le32_to_cpu(info
->FileNameLength
);
443 de
->resume_key
= info
->FileIndex
;
446 static void cifs_fill_dirent_search(struct cifs_dirent
*de
,
447 const SEARCH_ID_FULL_DIR_INFO
*info
)
449 de
->name
= &info
->FileName
[0];
450 de
->namelen
= le32_to_cpu(info
->FileNameLength
);
451 de
->resume_key
= info
->FileIndex
;
452 de
->ino
= le64_to_cpu(info
->UniqueId
);
455 static void cifs_fill_dirent_both(struct cifs_dirent
*de
,
456 const FILE_BOTH_DIRECTORY_INFO
*info
)
458 de
->name
= &info
->FileName
[0];
459 de
->namelen
= le32_to_cpu(info
->FileNameLength
);
460 de
->resume_key
= info
->FileIndex
;
463 static void cifs_fill_dirent_std(struct cifs_dirent
*de
,
464 const FIND_FILE_STANDARD_INFO
*info
)
466 de
->name
= &info
->FileName
[0];
467 /* one byte length, no endianess conversion */
468 de
->namelen
= info
->FileNameLength
;
469 de
->resume_key
= info
->ResumeKey
;
472 static int cifs_fill_dirent(struct cifs_dirent
*de
, const void *info
,
473 u16 level
, bool is_unicode
)
475 memset(de
, 0, sizeof(*de
));
478 case SMB_FIND_FILE_UNIX
:
479 cifs_fill_dirent_unix(de
, info
, is_unicode
);
481 case SMB_FIND_FILE_DIRECTORY_INFO
:
482 cifs_fill_dirent_dir(de
, info
);
484 case SMB_FIND_FILE_FULL_DIRECTORY_INFO
:
485 cifs_fill_dirent_full(de
, info
);
487 case SMB_FIND_FILE_ID_FULL_DIR_INFO
:
488 cifs_fill_dirent_search(de
, info
);
490 case SMB_FIND_FILE_BOTH_DIRECTORY_INFO
:
491 cifs_fill_dirent_both(de
, info
);
493 case SMB_FIND_FILE_INFO_STANDARD
:
494 cifs_fill_dirent_std(de
, info
);
497 cifs_dbg(FYI
, "Unknown findfirst level %d\n", level
);
504 #define UNICODE_DOT cpu_to_le16(0x2e)
506 /* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
507 static int cifs_entry_is_dot(struct cifs_dirent
*de
, bool is_unicode
)
515 __le16
*ufilename
= (__le16
*)de
->name
;
516 if (de
->namelen
== 2) {
518 if (ufilename
[0] == UNICODE_DOT
)
520 } else if (de
->namelen
== 4) {
522 if (ufilename
[0] == UNICODE_DOT
&&
523 ufilename
[1] == UNICODE_DOT
)
527 if (de
->namelen
== 1) {
528 if (de
->name
[0] == '.')
530 } else if (de
->namelen
== 2) {
531 if (de
->name
[0] == '.' && de
->name
[1] == '.')
539 /* Check if directory that we are searching has changed so we can decide
540 whether we can use the cached search results from the previous search */
541 static int is_dir_changed(struct file
*file
)
543 struct inode
*inode
= file_inode(file
);
544 struct cifsInodeInfo
*cifsInfo
= CIFS_I(inode
);
546 if (cifsInfo
->time
== 0)
547 return 1; /* directory was changed, perhaps due to unlink */
553 static int cifs_save_resume_key(const char *current_entry
,
554 struct cifsFileInfo
*file_info
)
556 struct cifs_dirent de
;
559 rc
= cifs_fill_dirent(&de
, current_entry
, file_info
->srch_inf
.info_level
,
560 file_info
->srch_inf
.unicode
);
562 file_info
->srch_inf
.presume_name
= de
.name
;
563 file_info
->srch_inf
.resume_name_len
= de
.namelen
;
564 file_info
->srch_inf
.resume_key
= de
.resume_key
;
570 * Find the corresponding entry in the search. Note that the SMB server returns
571 * search entries for . and .. which complicates logic here if we choose to
572 * parse for them and we do not assume that they are located in the findfirst
573 * return buffer. We start counting in the buffer with entry 2 and increment for
574 * every entry (do not increment for . or .. entry).
577 find_cifs_entry(const unsigned int xid
, struct cifs_tcon
*tcon
, loff_t pos
,
578 struct file
*file
, char **current_entry
, int *num_to_ret
)
583 loff_t first_entry_in_buffer
;
584 loff_t index_to_find
= pos
;
585 struct cifsFileInfo
*cfile
= file
->private_data
;
586 struct cifs_sb_info
*cifs_sb
= CIFS_SB(file
->f_path
.dentry
->d_sb
);
587 struct TCP_Server_Info
*server
= tcon
->ses
->server
;
588 /* check if index in the buffer */
590 if (!server
->ops
->query_dir_first
|| !server
->ops
->query_dir_next
)
593 if ((cfile
== NULL
) || (current_entry
== NULL
) || (num_to_ret
== NULL
))
596 *current_entry
= NULL
;
597 first_entry_in_buffer
= cfile
->srch_inf
.index_of_last_entry
-
598 cfile
->srch_inf
.entries_in_buffer
;
601 * If first entry in buf is zero then is first buffer
602 * in search response data which means it is likely . and ..
603 * will be in this buffer, although some servers do not return
604 * . and .. for the root of a drive and for those we need
605 * to start two entries earlier.
608 dump_cifs_file_struct(file
, "In fce ");
609 if (((index_to_find
< cfile
->srch_inf
.index_of_last_entry
) &&
610 is_dir_changed(file
)) || (index_to_find
< first_entry_in_buffer
)) {
611 /* close and restart search */
612 cifs_dbg(FYI
, "search backing up - close and restart search\n");
613 spin_lock(&cifs_file_list_lock
);
614 if (!cfile
->srch_inf
.endOfSearch
&& !cfile
->invalidHandle
) {
615 cfile
->invalidHandle
= true;
616 spin_unlock(&cifs_file_list_lock
);
617 if (server
->ops
->close
)
618 server
->ops
->close(xid
, tcon
, &cfile
->fid
);
620 spin_unlock(&cifs_file_list_lock
);
621 if (cfile
->srch_inf
.ntwrk_buf_start
) {
622 cifs_dbg(FYI
, "freeing SMB ff cache buf on search rewind\n");
623 if (cfile
->srch_inf
.smallBuf
)
624 cifs_small_buf_release(cfile
->srch_inf
.
627 cifs_buf_release(cfile
->srch_inf
.
629 cfile
->srch_inf
.ntwrk_buf_start
= NULL
;
631 rc
= initiate_cifs_search(xid
, file
);
633 cifs_dbg(FYI
, "error %d reinitiating a search on rewind\n",
637 /* FindFirst/Next set last_entry to NULL on malformed reply */
638 if (cfile
->srch_inf
.last_entry
)
639 cifs_save_resume_key(cfile
->srch_inf
.last_entry
, cfile
);
642 search_flags
= CIFS_SEARCH_CLOSE_AT_END
| CIFS_SEARCH_RETURN_RESUME
;
643 if (backup_cred(cifs_sb
))
644 search_flags
|= CIFS_SEARCH_BACKUP_SEARCH
;
646 while ((index_to_find
>= cfile
->srch_inf
.index_of_last_entry
) &&
647 (rc
== 0) && !cfile
->srch_inf
.endOfSearch
) {
648 cifs_dbg(FYI
, "calling findnext2\n");
649 rc
= server
->ops
->query_dir_next(xid
, tcon
, &cfile
->fid
,
652 /* FindFirst/Next set last_entry to NULL on malformed reply */
653 if (cfile
->srch_inf
.last_entry
)
654 cifs_save_resume_key(cfile
->srch_inf
.last_entry
, cfile
);
658 if (index_to_find
< cfile
->srch_inf
.index_of_last_entry
) {
659 /* we found the buffer that contains the entry */
660 /* scan and find it */
663 char *end_of_smb
= cfile
->srch_inf
.ntwrk_buf_start
+
664 server
->ops
->calc_smb_size(
665 cfile
->srch_inf
.ntwrk_buf_start
);
667 cur_ent
= cfile
->srch_inf
.srch_entries_start
;
668 first_entry_in_buffer
= cfile
->srch_inf
.index_of_last_entry
669 - cfile
->srch_inf
.entries_in_buffer
;
670 pos_in_buf
= index_to_find
- first_entry_in_buffer
;
671 cifs_dbg(FYI
, "found entry - pos_in_buf %d\n", pos_in_buf
);
673 for (i
= 0; (i
< (pos_in_buf
)) && (cur_ent
!= NULL
); i
++) {
674 /* go entry by entry figuring out which is first */
675 cur_ent
= nxt_dir_entry(cur_ent
, end_of_smb
,
676 cfile
->srch_inf
.info_level
);
678 if ((cur_ent
== NULL
) && (i
< pos_in_buf
)) {
679 /* BB fixme - check if we should flag this error */
680 cifs_dbg(VFS
, "reached end of buf searching for pos in buf %d index to find %lld rc %d\n",
681 pos_in_buf
, index_to_find
, rc
);
684 *current_entry
= cur_ent
;
686 cifs_dbg(FYI
, "index not in buffer - could not findnext into it\n");
690 if (pos_in_buf
>= cfile
->srch_inf
.entries_in_buffer
) {
691 cifs_dbg(FYI
, "can not return entries pos_in_buf beyond last\n");
694 *num_to_ret
= cfile
->srch_inf
.entries_in_buffer
- pos_in_buf
;
699 static int cifs_filldir(char *find_entry
, struct file
*file
,
700 struct dir_context
*ctx
,
701 char *scratch_buf
, unsigned int max_len
)
703 struct cifsFileInfo
*file_info
= file
->private_data
;
704 struct super_block
*sb
= file
->f_path
.dentry
->d_sb
;
705 struct cifs_sb_info
*cifs_sb
= CIFS_SB(sb
);
706 struct cifs_dirent de
= { NULL
, };
707 struct cifs_fattr fattr
;
712 rc
= cifs_fill_dirent(&de
, find_entry
, file_info
->srch_inf
.info_level
,
713 file_info
->srch_inf
.unicode
);
717 if (de
.namelen
> max_len
) {
718 cifs_dbg(VFS
, "bad search response length %zd past smb end\n",
723 /* skip . and .. since we added them first */
724 if (cifs_entry_is_dot(&de
, file_info
->srch_inf
.unicode
))
727 if (file_info
->srch_inf
.unicode
) {
728 struct nls_table
*nlt
= cifs_sb
->local_nls
;
730 name
.name
= scratch_buf
;
732 cifs_from_utf16((char *)name
.name
, (__le16
*)de
.name
,
734 min_t(size_t, de
.namelen
,
735 (size_t)max_len
), nlt
,
736 cifs_sb
->mnt_cifs_flags
&
737 CIFS_MOUNT_MAP_SPECIAL_CHR
);
738 name
.len
-= nls_nullsize(nlt
);
741 name
.len
= de
.namelen
;
744 switch (file_info
->srch_inf
.info_level
) {
745 case SMB_FIND_FILE_UNIX
:
746 cifs_unix_basic_to_fattr(&fattr
,
747 &((FILE_UNIX_INFO
*)find_entry
)->basic
,
750 case SMB_FIND_FILE_INFO_STANDARD
:
751 cifs_std_info_to_fattr(&fattr
,
752 (FIND_FILE_STANDARD_INFO
*)find_entry
,
756 cifs_dir_info_to_fattr(&fattr
,
757 (FILE_DIRECTORY_INFO
*)find_entry
,
762 if (de
.ino
&& (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_SERVER_INUM
)) {
763 fattr
.cf_uniqueid
= de
.ino
;
765 fattr
.cf_uniqueid
= iunique(sb
, ROOT_I
);
766 cifs_autodisable_serverino(cifs_sb
);
769 if ((cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_MF_SYMLINKS
) &&
770 CIFSCouldBeMFSymlink(&fattr
))
772 * trying to get the type and mode can be slow,
773 * so just call those regular files for now, and mark
776 fattr
.cf_flags
|= CIFS_FATTR_NEED_REVAL
;
778 cifs_prime_dcache(file
->f_dentry
, &name
, &fattr
);
780 ino
= cifs_uniqueid_to_ino_t(fattr
.cf_uniqueid
);
781 return !dir_emit(ctx
, name
.name
, name
.len
, ino
, fattr
.cf_dtype
);
785 int cifs_readdir(struct file
*file
, struct dir_context
*ctx
)
790 struct cifs_tcon
*tcon
;
791 struct cifsFileInfo
*cifsFile
= NULL
;
794 char *tmp_buf
= NULL
;
796 unsigned int max_len
;
801 * Ensure FindFirst doesn't fail before doing filldir() for '.' and
802 * '..'. Otherwise we won't be able to notify VFS in case of failure.
804 if (file
->private_data
== NULL
) {
805 rc
= initiate_cifs_search(xid
, file
);
806 cifs_dbg(FYI
, "initiate cifs search rc %d\n", rc
);
811 if (!dir_emit_dots(file
, ctx
))
814 /* 1) If search is active,
815 is in current search buffer?
816 if it before then restart search
817 if after then keep searching till find it */
819 if (file
->private_data
== NULL
) {
823 cifsFile
= file
->private_data
;
824 if (cifsFile
->srch_inf
.endOfSearch
) {
825 if (cifsFile
->srch_inf
.emptyDir
) {
826 cifs_dbg(FYI
, "End of search, empty dir\n");
831 cifsFile->invalidHandle = true;
832 tcon->ses->server->close(xid, tcon, &cifsFile->fid);
835 tcon
= tlink_tcon(cifsFile
->tlink
);
836 rc
= find_cifs_entry(xid
, tcon
, ctx
->pos
, file
, ¤t_entry
,
839 cifs_dbg(FYI
, "fce error %d\n", rc
);
841 } else if (current_entry
!= NULL
) {
842 cifs_dbg(FYI
, "entry %lld found\n", ctx
->pos
);
844 cifs_dbg(FYI
, "could not find entry\n");
847 cifs_dbg(FYI
, "loop through %d times filling dir for net buf %p\n",
848 num_to_fill
, cifsFile
->srch_inf
.ntwrk_buf_start
);
849 max_len
= tcon
->ses
->server
->ops
->calc_smb_size(
850 cifsFile
->srch_inf
.ntwrk_buf_start
);
851 end_of_smb
= cifsFile
->srch_inf
.ntwrk_buf_start
+ max_len
;
853 tmp_buf
= kmalloc(UNICODE_NAME_MAX
, GFP_KERNEL
);
854 if (tmp_buf
== NULL
) {
859 for (i
= 0; i
< num_to_fill
; i
++) {
860 if (current_entry
== NULL
) {
861 /* evaluate whether this case is an error */
862 cifs_dbg(VFS
, "past SMB end, num to fill %d i %d\n",
867 * if buggy server returns . and .. late do we want to
868 * check for that here?
870 rc
= cifs_filldir(current_entry
, file
, ctx
,
880 cifsFile
->srch_inf
.index_of_last_entry
) {
881 cifs_dbg(FYI
, "last entry in buf at pos %lld %s\n",
883 cifs_save_resume_key(current_entry
, cifsFile
);
887 nxt_dir_entry(current_entry
, end_of_smb
,
888 cifsFile
->srch_inf
.info_level
);