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 cifs_fill_common_info(struct cifs_fattr *fattr, struct cifs_sb_info *cifs_sb)
140 fattr->cf_uid = cifs_sb->mnt_uid;
141 fattr->cf_gid = cifs_sb->mnt_gid;
143 if (fattr->cf_cifsattrs & ATTR_DIRECTORY) {
144 fattr->cf_mode = S_IFDIR | cifs_sb->mnt_dir_mode;
145 fattr->cf_dtype = DT_DIR;
147 fattr->cf_mode = S_IFREG | cifs_sb->mnt_file_mode;
148 fattr->cf_dtype = DT_REG;
151 if (fattr->cf_cifsattrs & ATTR_READONLY)
152 fattr->cf_mode &= ~S_IWUGO;
155 * We of course don't get ACL info in FIND_FIRST/NEXT results, so
156 * mark it for revalidation so that "ls -l" will look right. It might
157 * be super-slow, but if we don't do this then the ownership of files
158 * may look wrong since the inodes may not have timed out by the time
159 * "ls" does a stat() call on them.
161 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
162 fattr->cf_flags |= CIFS_FATTR_NEED_REVAL;
164 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL &&
165 fattr->cf_cifsattrs & ATTR_SYSTEM) {
166 if (fattr->cf_eof == 0) {
167 fattr->cf_mode &= ~S_IFMT;
168 fattr->cf_mode |= S_IFIFO;
169 fattr->cf_dtype = DT_FIFO;
172 * trying to get the type and mode via SFU can be slow,
173 * so just call those regular files for now, and mark
176 fattr->cf_flags |= CIFS_FATTR_NEED_REVAL;
182 cifs_dir_info_to_fattr(struct cifs_fattr *fattr, FILE_DIRECTORY_INFO *info,
183 struct cifs_sb_info *cifs_sb)
185 memset(fattr, 0, sizeof(*fattr));
186 fattr->cf_cifsattrs = le32_to_cpu(info->ExtFileAttributes);
187 fattr->cf_eof = le64_to_cpu(info->EndOfFile);
188 fattr->cf_bytes = le64_to_cpu(info->AllocationSize);
189 fattr->cf_createtime = le64_to_cpu(info->CreationTime);
190 fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
191 fattr->cf_ctime = cifs_NTtimeToUnix(info->ChangeTime);
192 fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime);
194 cifs_fill_common_info(fattr, cifs_sb);
198 cifs_std_info_to_fattr(struct cifs_fattr *fattr, FIND_FILE_STANDARD_INFO *info,
199 struct cifs_sb_info *cifs_sb)
201 int offset = cifs_sb_master_tcon(cifs_sb)->ses->server->timeAdj;
203 memset(fattr, 0, sizeof(*fattr));
204 fattr->cf_atime = cnvrtDosUnixTm(info->LastAccessDate,
205 info->LastAccessTime, offset);
206 fattr->cf_ctime = cnvrtDosUnixTm(info->LastWriteDate,
207 info->LastWriteTime, offset);
208 fattr->cf_mtime = cnvrtDosUnixTm(info->LastWriteDate,
209 info->LastWriteTime, offset);
211 fattr->cf_cifsattrs = le16_to_cpu(info->Attributes);
212 fattr->cf_bytes = le32_to_cpu(info->AllocationSize);
213 fattr->cf_eof = le32_to_cpu(info->DataSize);
215 cifs_fill_common_info(fattr, cifs_sb);
218 /* BB eventually need to add the following helper function to
219 resolve NT_STATUS_STOPPED_ON_SYMLINK return code when
220 we try to do FindFirst on (NTFS) directory symlinks */
222 int get_symlink_reparse_path(char *full_path, struct cifs_sb_info *cifs_sb,
229 struct cifs_tcon *ptcon = cifs_sb_tcon(cifs_sb);
232 rc = CIFSSMBOpen(xid, ptcon, full_path, FILE_OPEN, GENERIC_READ,
233 OPEN_REPARSE_POINT, &fid, &oplock, NULL,
235 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
237 tmpbuffer = kmalloc(maxpath);
238 rc = CIFSSMBQueryReparseLinkInfo(xid, ptcon, full_path,
243 if (CIFSSMBClose(xid, ptcon, fid)) {
244 cifs_dbg(FYI, "Error closing temporary reparsepoint open\n");
251 initiate_cifs_search(const unsigned int xid, struct file *file)
255 char *full_path = NULL;
256 struct cifsFileInfo *cifsFile;
257 struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
258 struct tcon_link *tlink = NULL;
259 struct cifs_tcon *tcon;
260 struct TCP_Server_Info *server;
262 if (file->private_data == NULL) {
263 tlink = cifs_sb_tlink(cifs_sb);
265 return PTR_ERR(tlink);
267 cifsFile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
268 if (cifsFile == NULL) {
272 file->private_data = cifsFile;
273 cifsFile->tlink = cifs_get_tlink(tlink);
274 tcon = tlink_tcon(tlink);
276 cifsFile = file->private_data;
277 tcon = tlink_tcon(cifsFile->tlink);
280 server = tcon->ses->server;
282 if (!server->ops->query_dir_first) {
287 cifsFile->invalidHandle = true;
288 cifsFile->srch_inf.endOfSearch = false;
290 full_path = build_path_from_dentry(file->f_path.dentry);
291 if (full_path == NULL) {
296 cifs_dbg(FYI, "Full path: %s start at: %lld\n", full_path, file->f_pos);
299 /* test for Unix extensions */
300 /* but now check for them on the share/mount not on the SMB session */
301 /* if (cap_unix(tcon->ses) { */
303 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
304 else if ((tcon->ses->capabilities &
305 tcon->ses->server->vals->cap_nt_find) == 0) {
306 cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD;
307 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
308 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
309 } else /* not srvinos - BB fixme add check for backlevel? */ {
310 cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
313 search_flags = CIFS_SEARCH_CLOSE_AT_END | CIFS_SEARCH_RETURN_RESUME;
314 if (backup_cred(cifs_sb))
315 search_flags |= CIFS_SEARCH_BACKUP_SEARCH;
317 rc = server->ops->query_dir_first(xid, tcon, full_path, cifs_sb,
318 &cifsFile->fid, search_flags,
319 &cifsFile->srch_inf);
322 cifsFile->invalidHandle = false;
323 /* BB add following call to handle readdir on new NTFS symlink errors
324 else if STATUS_STOPPED_ON_SYMLINK
325 call get_symlink_reparse_path and retry with new path */
326 else if ((rc == -EOPNOTSUPP) &&
327 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
328 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
333 cifs_put_tlink(tlink);
337 /* return length of unicode string in bytes */
338 static int cifs_unicode_bytelen(const char *str)
341 const __le16 *ustr = (const __le16 *)str;
343 for (len = 0; len <= PATH_MAX; len++) {
347 cifs_dbg(FYI, "Unicode string longer than PATH_MAX found\n");
351 static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level)
354 FILE_DIRECTORY_INFO *pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
356 if (level == SMB_FIND_FILE_INFO_STANDARD) {
357 FIND_FILE_STANDARD_INFO *pfData;
358 pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo;
360 new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) +
361 pfData->FileNameLength;
363 new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
364 cifs_dbg(FYI, "new entry %p old entry %p\n", new_entry, old_entry);
365 /* validate that new_entry is not past end of SMB */
366 if (new_entry >= end_of_smb) {
367 cifs_dbg(VFS, "search entry %p began after end of SMB %p old entry %p\n",
368 new_entry, end_of_smb, old_entry);
370 } else if (((level == SMB_FIND_FILE_INFO_STANDARD) &&
371 (new_entry + sizeof(FIND_FILE_STANDARD_INFO) > end_of_smb))
372 || ((level != SMB_FIND_FILE_INFO_STANDARD) &&
373 (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb))) {
374 cifs_dbg(VFS, "search entry %p extends after end of SMB %p\n",
375 new_entry, end_of_smb);
389 static void cifs_fill_dirent_unix(struct cifs_dirent *de,
390 const FILE_UNIX_INFO *info, bool is_unicode)
392 de->name = &info->FileName[0];
394 de->namelen = cifs_unicode_bytelen(de->name);
396 de->namelen = strnlen(de->name, PATH_MAX);
397 de->resume_key = info->ResumeKey;
398 de->ino = le64_to_cpu(info->basic.UniqueId);
401 static void cifs_fill_dirent_dir(struct cifs_dirent *de,
402 const FILE_DIRECTORY_INFO *info)
404 de->name = &info->FileName[0];
405 de->namelen = le32_to_cpu(info->FileNameLength);
406 de->resume_key = info->FileIndex;
409 static void cifs_fill_dirent_full(struct cifs_dirent *de,
410 const FILE_FULL_DIRECTORY_INFO *info)
412 de->name = &info->FileName[0];
413 de->namelen = le32_to_cpu(info->FileNameLength);
414 de->resume_key = info->FileIndex;
417 static void cifs_fill_dirent_search(struct cifs_dirent *de,
418 const SEARCH_ID_FULL_DIR_INFO *info)
420 de->name = &info->FileName[0];
421 de->namelen = le32_to_cpu(info->FileNameLength);
422 de->resume_key = info->FileIndex;
423 de->ino = le64_to_cpu(info->UniqueId);
426 static void cifs_fill_dirent_both(struct cifs_dirent *de,
427 const FILE_BOTH_DIRECTORY_INFO *info)
429 de->name = &info->FileName[0];
430 de->namelen = le32_to_cpu(info->FileNameLength);
431 de->resume_key = info->FileIndex;
434 static void cifs_fill_dirent_std(struct cifs_dirent *de,
435 const FIND_FILE_STANDARD_INFO *info)
437 de->name = &info->FileName[0];
438 /* one byte length, no endianess conversion */
439 de->namelen = info->FileNameLength;
440 de->resume_key = info->ResumeKey;
443 static int cifs_fill_dirent(struct cifs_dirent *de, const void *info,
444 u16 level, bool is_unicode)
446 memset(de, 0, sizeof(*de));
449 case SMB_FIND_FILE_UNIX:
450 cifs_fill_dirent_unix(de, info, is_unicode);
452 case SMB_FIND_FILE_DIRECTORY_INFO:
453 cifs_fill_dirent_dir(de, info);
455 case SMB_FIND_FILE_FULL_DIRECTORY_INFO:
456 cifs_fill_dirent_full(de, info);
458 case SMB_FIND_FILE_ID_FULL_DIR_INFO:
459 cifs_fill_dirent_search(de, info);
461 case SMB_FIND_FILE_BOTH_DIRECTORY_INFO:
462 cifs_fill_dirent_both(de, info);
464 case SMB_FIND_FILE_INFO_STANDARD:
465 cifs_fill_dirent_std(de, info);
468 cifs_dbg(FYI, "Unknown findfirst level %d\n", level);
475 #define UNICODE_DOT cpu_to_le16(0x2e)
477 /* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
478 static int cifs_entry_is_dot(struct cifs_dirent *de, bool is_unicode)
486 __le16 *ufilename = (__le16 *)de->name;
487 if (de->namelen == 2) {
489 if (ufilename[0] == UNICODE_DOT)
491 } else if (de->namelen == 4) {
493 if (ufilename[0] == UNICODE_DOT &&
494 ufilename[1] == UNICODE_DOT)
498 if (de->namelen == 1) {
499 if (de->name[0] == '.')
501 } else if (de->namelen == 2) {
502 if (de->name[0] == '.' && de->name[1] == '.')
510 /* Check if directory that we are searching has changed so we can decide
511 whether we can use the cached search results from the previous search */
512 static int is_dir_changed(struct file *file)
514 struct inode *inode = file_inode(file);
515 struct cifsInodeInfo *cifsInfo = CIFS_I(inode);
517 if (cifsInfo->time == 0)
518 return 1; /* directory was changed, perhaps due to unlink */
524 static int cifs_save_resume_key(const char *current_entry,
525 struct cifsFileInfo *file_info)
527 struct cifs_dirent de;
530 rc = cifs_fill_dirent(&de, current_entry, file_info->srch_inf.info_level,
531 file_info->srch_inf.unicode);
533 file_info->srch_inf.presume_name = de.name;
534 file_info->srch_inf.resume_name_len = de.namelen;
535 file_info->srch_inf.resume_key = de.resume_key;
541 * Find the corresponding entry in the search. Note that the SMB server returns
542 * search entries for . and .. which complicates logic here if we choose to
543 * parse for them and we do not assume that they are located in the findfirst
544 * return buffer. We start counting in the buffer with entry 2 and increment for
545 * every entry (do not increment for . or .. entry).
548 find_cifs_entry(const unsigned int xid, struct cifs_tcon *tcon,
549 struct file *file, char **current_entry, int *num_to_ret)
554 loff_t first_entry_in_buffer;
555 loff_t index_to_find = file->f_pos;
556 struct cifsFileInfo *cfile = file->private_data;
557 struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
558 struct TCP_Server_Info *server = tcon->ses->server;
559 /* check if index in the buffer */
561 if (!server->ops->query_dir_first || !server->ops->query_dir_next)
564 if ((cfile == NULL) || (current_entry == NULL) || (num_to_ret == NULL))
567 *current_entry = NULL;
568 first_entry_in_buffer = cfile->srch_inf.index_of_last_entry -
569 cfile->srch_inf.entries_in_buffer;
572 * If first entry in buf is zero then is first buffer
573 * in search response data which means it is likely . and ..
574 * will be in this buffer, although some servers do not return
575 * . and .. for the root of a drive and for those we need
576 * to start two entries earlier.
579 dump_cifs_file_struct(file, "In fce ");
580 if (((index_to_find < cfile->srch_inf.index_of_last_entry) &&
581 is_dir_changed(file)) || (index_to_find < first_entry_in_buffer)) {
582 /* close and restart search */
583 cifs_dbg(FYI, "search backing up - close and restart search\n");
584 spin_lock(&cifs_file_list_lock);
585 if (server->ops->dir_needs_close(cfile)) {
586 cfile->invalidHandle = true;
587 spin_unlock(&cifs_file_list_lock);
588 if (server->ops->close_dir)
589 server->ops->close_dir(xid, tcon, &cfile->fid);
591 spin_unlock(&cifs_file_list_lock);
592 if (cfile->srch_inf.ntwrk_buf_start) {
593 cifs_dbg(FYI, "freeing SMB ff cache buf on search rewind\n");
594 if (cfile->srch_inf.smallBuf)
595 cifs_small_buf_release(cfile->srch_inf.
598 cifs_buf_release(cfile->srch_inf.
600 cfile->srch_inf.ntwrk_buf_start = NULL;
602 rc = initiate_cifs_search(xid, file);
604 cifs_dbg(FYI, "error %d reinitiating a search on rewind\n",
608 /* FindFirst/Next set last_entry to NULL on malformed reply */
609 if (cfile->srch_inf.last_entry)
610 cifs_save_resume_key(cfile->srch_inf.last_entry, cfile);
613 search_flags = CIFS_SEARCH_CLOSE_AT_END | CIFS_SEARCH_RETURN_RESUME;
614 if (backup_cred(cifs_sb))
615 search_flags |= CIFS_SEARCH_BACKUP_SEARCH;
617 while ((index_to_find >= cfile->srch_inf.index_of_last_entry) &&
618 (rc == 0) && !cfile->srch_inf.endOfSearch) {
619 cifs_dbg(FYI, "calling findnext2\n");
620 rc = server->ops->query_dir_next(xid, tcon, &cfile->fid,
623 /* FindFirst/Next set last_entry to NULL on malformed reply */
624 if (cfile->srch_inf.last_entry)
625 cifs_save_resume_key(cfile->srch_inf.last_entry, cfile);
629 if (index_to_find < cfile->srch_inf.index_of_last_entry) {
630 /* we found the buffer that contains the entry */
631 /* scan and find it */
634 char *end_of_smb = cfile->srch_inf.ntwrk_buf_start +
635 server->ops->calc_smb_size(
636 cfile->srch_inf.ntwrk_buf_start);
638 cur_ent = cfile->srch_inf.srch_entries_start;
639 first_entry_in_buffer = cfile->srch_inf.index_of_last_entry
640 - cfile->srch_inf.entries_in_buffer;
641 pos_in_buf = index_to_find - first_entry_in_buffer;
642 cifs_dbg(FYI, "found entry - pos_in_buf %d\n", pos_in_buf);
644 for (i = 0; (i < (pos_in_buf)) && (cur_ent != NULL); i++) {
645 /* go entry by entry figuring out which is first */
646 cur_ent = nxt_dir_entry(cur_ent, end_of_smb,
647 cfile->srch_inf.info_level);
649 if ((cur_ent == NULL) && (i < pos_in_buf)) {
650 /* BB fixme - check if we should flag this error */
651 cifs_dbg(VFS, "reached end of buf searching for pos in buf %d index to find %lld rc %d\n",
652 pos_in_buf, index_to_find, rc);
655 *current_entry = cur_ent;
657 cifs_dbg(FYI, "index not in buffer - could not findnext into it\n");
661 if (pos_in_buf >= cfile->srch_inf.entries_in_buffer) {
662 cifs_dbg(FYI, "can not return entries pos_in_buf beyond last\n");
665 *num_to_ret = cfile->srch_inf.entries_in_buffer - pos_in_buf;
670 static int cifs_filldir(char *find_entry, struct file *file, filldir_t filldir,
671 void *dirent, char *scratch_buf, unsigned int max_len)
673 struct cifsFileInfo *file_info = file->private_data;
674 struct super_block *sb = file->f_path.dentry->d_sb;
675 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
676 struct cifs_dirent de = { NULL, };
677 struct cifs_fattr fattr;
682 rc = cifs_fill_dirent(&de, find_entry, file_info->srch_inf.info_level,
683 file_info->srch_inf.unicode);
687 if (de.namelen > max_len) {
688 cifs_dbg(VFS, "bad search response length %zd past smb end\n",
693 /* skip . and .. since we added them first */
694 if (cifs_entry_is_dot(&de, file_info->srch_inf.unicode))
697 if (file_info->srch_inf.unicode) {
698 struct nls_table *nlt = cifs_sb->local_nls;
700 name.name = scratch_buf;
702 cifs_from_utf16((char *)name.name, (__le16 *)de.name,
704 min_t(size_t, de.namelen,
705 (size_t)max_len), nlt,
706 cifs_sb->mnt_cifs_flags &
707 CIFS_MOUNT_MAP_SPECIAL_CHR);
708 name.len -= nls_nullsize(nlt);
711 name.len = de.namelen;
714 switch (file_info->srch_inf.info_level) {
715 case SMB_FIND_FILE_UNIX:
716 cifs_unix_basic_to_fattr(&fattr,
717 &((FILE_UNIX_INFO *)find_entry)->basic,
720 case SMB_FIND_FILE_INFO_STANDARD:
721 cifs_std_info_to_fattr(&fattr,
722 (FIND_FILE_STANDARD_INFO *)find_entry,
726 cifs_dir_info_to_fattr(&fattr,
727 (FILE_DIRECTORY_INFO *)find_entry,
732 if (de.ino && (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
733 fattr.cf_uniqueid = de.ino;
735 fattr.cf_uniqueid = iunique(sb, ROOT_I);
736 cifs_autodisable_serverino(cifs_sb);
739 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) &&
740 CIFSCouldBeMFSymlink(&fattr))
742 * trying to get the type and mode can be slow,
743 * so just call those regular files for now, and mark
746 fattr.cf_flags |= CIFS_FATTR_NEED_REVAL;
748 cifs_prime_dcache(file->f_dentry, &name, &fattr);
750 ino = cifs_uniqueid_to_ino_t(fattr.cf_uniqueid);
751 rc = filldir(dirent, name.name, name.len, file->f_pos, ino,
757 int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
762 struct cifs_tcon *tcon;
763 struct cifsFileInfo *cifsFile = NULL;
766 char *tmp_buf = NULL;
768 unsigned int max_len;
773 * Ensure FindFirst doesn't fail before doing filldir() for '.' and
774 * '..'. Otherwise we won't be able to notify VFS in case of failure.
776 if (file->private_data == NULL) {
777 rc = initiate_cifs_search(xid, file);
778 cifs_dbg(FYI, "initiate cifs search rc %d\n", rc);
783 switch ((int) file->f_pos) {
785 if (filldir(direntry, ".", 1, file->f_pos,
786 file_inode(file)->i_ino, DT_DIR) < 0) {
787 cifs_dbg(VFS, "Filldir for current dir failed\n");
793 if (filldir(direntry, "..", 2, file->f_pos,
794 parent_ino(file->f_path.dentry), DT_DIR) < 0) {
795 cifs_dbg(VFS, "Filldir for parent dir failed\n");
801 /* 1) If search is active,
802 is in current search buffer?
803 if it before then restart search
804 if after then keep searching till find it */
806 if (file->private_data == NULL) {
811 cifsFile = file->private_data;
812 if (cifsFile->srch_inf.endOfSearch) {
813 if (cifsFile->srch_inf.emptyDir) {
814 cifs_dbg(FYI, "End of search, empty dir\n");
819 cifsFile->invalidHandle = true;
820 tcon->ses->server->close(xid, tcon, &cifsFile->fid);
823 tcon = tlink_tcon(cifsFile->tlink);
824 rc = find_cifs_entry(xid, tcon, file, ¤t_entry,
827 cifs_dbg(FYI, "fce error %d\n", rc);
829 } else if (current_entry != NULL) {
830 cifs_dbg(FYI, "entry %lld found\n", file->f_pos);
832 cifs_dbg(FYI, "could not find entry\n");
835 cifs_dbg(FYI, "loop through %d times filling dir for net buf %p\n",
836 num_to_fill, cifsFile->srch_inf.ntwrk_buf_start);
837 max_len = tcon->ses->server->ops->calc_smb_size(
838 cifsFile->srch_inf.ntwrk_buf_start);
839 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len;
841 tmp_buf = kmalloc(UNICODE_NAME_MAX, GFP_KERNEL);
842 if (tmp_buf == NULL) {
847 for (i = 0; (i < num_to_fill) && (rc == 0); i++) {
848 if (current_entry == NULL) {
849 /* evaluate whether this case is an error */
850 cifs_dbg(VFS, "past SMB end, num to fill %d i %d\n",
855 * if buggy server returns . and .. late do we want to
856 * check for that here?
858 rc = cifs_filldir(current_entry, file, filldir,
859 direntry, tmp_buf, max_len);
860 if (rc == -EOVERFLOW) {
867 cifsFile->srch_inf.index_of_last_entry) {
868 cifs_dbg(FYI, "last entry in buf at pos %lld %s\n",
869 file->f_pos, tmp_buf);
870 cifs_save_resume_key(current_entry, cifsFile);
874 nxt_dir_entry(current_entry, end_of_smb,
875 cifsFile->srch_inf.info_level);