4 * Directory search handling
6 * Copyright (C) International Business Machines Corp., 2004, 2008
7 * Copyright (C) Red Hat, Inc., 2011
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 cFYI(1, "empty cifs private file data");
54 if (cf->invalidHandle)
55 cFYI(1, "invalid handle");
56 if (cf->srch_inf.endOfSearch)
57 cFYI(1, "end of search");
58 if (cf->srch_inf.emptyDir)
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 cFYI(1, "%s: for %s", __func__, name->name);
85 if (parent->d_op && parent->d_op->d_hash)
86 parent->d_op->d_hash(parent, parent->d_inode, name);
88 name->hash = full_name_hash(name->name, name->len);
90 dentry = d_lookup(parent, name);
94 inode = dentry->d_inode;
97 * If we're generating inode numbers, then we don't
98 * want to clobber the existing one with the one that
99 * the readdir code created.
101 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM))
102 fattr->cf_uniqueid = CIFS_I(inode)->uniqueid;
104 /* update inode in place if i_ino didn't change */
105 if (CIFS_I(inode)->uniqueid == fattr->cf_uniqueid) {
106 cifs_fattr_to_inode(inode, fattr);
110 err = d_invalidate(dentry);
116 dentry = d_alloc(parent, name);
120 inode = cifs_iget(sb, fattr);
124 alias = d_materialise_unique(dentry, inode);
125 if (alias && !IS_ERR(alias))
132 cifs_fill_common_info(struct cifs_fattr *fattr, struct cifs_sb_info *cifs_sb)
134 fattr->cf_uid = cifs_sb->mnt_uid;
135 fattr->cf_gid = cifs_sb->mnt_gid;
137 if (fattr->cf_cifsattrs & ATTR_DIRECTORY) {
138 fattr->cf_mode = S_IFDIR | cifs_sb->mnt_dir_mode;
139 fattr->cf_dtype = DT_DIR;
141 fattr->cf_mode = S_IFREG | cifs_sb->mnt_file_mode;
142 fattr->cf_dtype = DT_REG;
145 if (fattr->cf_cifsattrs & ATTR_READONLY)
146 fattr->cf_mode &= ~S_IWUGO;
149 * We of course don't get ACL info in FIND_FIRST/NEXT results, so
150 * mark it for revalidation so that "ls -l" will look right. It might
151 * be super-slow, but if we don't do this then the ownership of files
152 * may look wrong since the inodes may not have timed out by the time
153 * "ls" does a stat() call on them.
155 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
156 fattr->cf_flags |= CIFS_FATTR_NEED_REVAL;
158 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL &&
159 fattr->cf_cifsattrs & ATTR_SYSTEM) {
160 if (fattr->cf_eof == 0) {
161 fattr->cf_mode &= ~S_IFMT;
162 fattr->cf_mode |= S_IFIFO;
163 fattr->cf_dtype = DT_FIFO;
166 * trying to get the type and mode via SFU can be slow,
167 * so just call those regular files for now, and mark
170 fattr->cf_flags |= CIFS_FATTR_NEED_REVAL;
176 cifs_dir_info_to_fattr(struct cifs_fattr *fattr, FILE_DIRECTORY_INFO *info,
177 struct cifs_sb_info *cifs_sb)
179 memset(fattr, 0, sizeof(*fattr));
180 fattr->cf_cifsattrs = le32_to_cpu(info->ExtFileAttributes);
181 fattr->cf_eof = le64_to_cpu(info->EndOfFile);
182 fattr->cf_bytes = le64_to_cpu(info->AllocationSize);
183 fattr->cf_createtime = le64_to_cpu(info->CreationTime);
184 fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
185 fattr->cf_ctime = cifs_NTtimeToUnix(info->ChangeTime);
186 fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime);
188 cifs_fill_common_info(fattr, cifs_sb);
192 cifs_std_info_to_fattr(struct cifs_fattr *fattr, FIND_FILE_STANDARD_INFO *info,
193 struct cifs_sb_info *cifs_sb)
195 int offset = cifs_sb_master_tcon(cifs_sb)->ses->server->timeAdj;
197 memset(fattr, 0, sizeof(*fattr));
198 fattr->cf_atime = cnvrtDosUnixTm(info->LastAccessDate,
199 info->LastAccessTime, offset);
200 fattr->cf_ctime = cnvrtDosUnixTm(info->LastWriteDate,
201 info->LastWriteTime, offset);
202 fattr->cf_mtime = cnvrtDosUnixTm(info->LastWriteDate,
203 info->LastWriteTime, offset);
205 fattr->cf_cifsattrs = le16_to_cpu(info->Attributes);
206 fattr->cf_bytes = le32_to_cpu(info->AllocationSize);
207 fattr->cf_eof = le32_to_cpu(info->DataSize);
209 cifs_fill_common_info(fattr, cifs_sb);
212 /* BB eventually need to add the following helper function to
213 resolve NT_STATUS_STOPPED_ON_SYMLINK return code when
214 we try to do FindFirst on (NTFS) directory symlinks */
216 int get_symlink_reparse_path(char *full_path, struct cifs_sb_info *cifs_sb,
223 struct cifs_tcon *ptcon = cifs_sb_tcon(cifs_sb);
226 rc = CIFSSMBOpen(xid, ptcon, full_path, FILE_OPEN, GENERIC_READ,
227 OPEN_REPARSE_POINT, &fid, &oplock, NULL,
229 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
231 tmpbuffer = kmalloc(maxpath);
232 rc = CIFSSMBQueryReparseLinkInfo(xid, ptcon, full_path,
237 if (CIFSSMBClose(xid, ptcon, fid)) {
238 cFYI(1, "Error closing temporary reparsepoint open");
245 initiate_cifs_search(const unsigned int xid, struct file *file)
249 char *full_path = NULL;
250 struct cifsFileInfo *cifsFile;
251 struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
252 struct tcon_link *tlink = NULL;
253 struct cifs_tcon *tcon;
254 struct TCP_Server_Info *server;
256 if (file->private_data == NULL) {
257 tlink = cifs_sb_tlink(cifs_sb);
259 return PTR_ERR(tlink);
261 cifsFile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
262 if (cifsFile == NULL) {
266 file->private_data = cifsFile;
267 cifsFile->tlink = cifs_get_tlink(tlink);
268 tcon = tlink_tcon(tlink);
270 cifsFile = file->private_data;
271 tcon = tlink_tcon(cifsFile->tlink);
274 server = tcon->ses->server;
276 if (!server->ops->query_dir_first) {
281 cifsFile->invalidHandle = true;
282 cifsFile->srch_inf.endOfSearch = false;
284 full_path = build_path_from_dentry(file->f_path.dentry);
285 if (full_path == NULL) {
290 cFYI(1, "Full path: %s start at: %lld", full_path, file->f_pos);
293 /* test for Unix extensions */
294 /* but now check for them on the share/mount not on the SMB session */
295 /* if (cap_unix(tcon->ses) { */
297 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
298 else if ((tcon->ses->capabilities &
299 tcon->ses->server->vals->cap_nt_find) == 0) {
300 cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD;
301 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
302 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
303 } else /* not srvinos - BB fixme add check for backlevel? */ {
304 cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
307 search_flags = CIFS_SEARCH_CLOSE_AT_END | CIFS_SEARCH_RETURN_RESUME;
308 if (backup_cred(cifs_sb))
309 search_flags |= CIFS_SEARCH_BACKUP_SEARCH;
311 rc = server->ops->query_dir_first(xid, tcon, full_path, cifs_sb,
312 &cifsFile->fid, search_flags,
313 &cifsFile->srch_inf);
316 cifsFile->invalidHandle = false;
317 /* BB add following call to handle readdir on new NTFS symlink errors
318 else if STATUS_STOPPED_ON_SYMLINK
319 call get_symlink_reparse_path and retry with new path */
320 else if ((rc == -EOPNOTSUPP) &&
321 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
322 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
327 cifs_put_tlink(tlink);
331 /* return length of unicode string in bytes */
332 static int cifs_unicode_bytelen(const char *str)
335 const __le16 *ustr = (const __le16 *)str;
337 for (len = 0; len <= PATH_MAX; len++) {
341 cFYI(1, "Unicode string longer than PATH_MAX found");
345 static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level)
348 FILE_DIRECTORY_INFO *pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
350 if (level == SMB_FIND_FILE_INFO_STANDARD) {
351 FIND_FILE_STANDARD_INFO *pfData;
352 pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo;
354 new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) +
355 pfData->FileNameLength;
357 new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
358 cFYI(1, "new entry %p old entry %p", new_entry, old_entry);
359 /* validate that new_entry is not past end of SMB */
360 if (new_entry >= end_of_smb) {
361 cERROR(1, "search entry %p began after end of SMB %p old entry %p",
362 new_entry, end_of_smb, old_entry);
364 } else if (((level == SMB_FIND_FILE_INFO_STANDARD) &&
365 (new_entry + sizeof(FIND_FILE_STANDARD_INFO) > end_of_smb))
366 || ((level != SMB_FIND_FILE_INFO_STANDARD) &&
367 (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb))) {
368 cERROR(1, "search entry %p extends after end of SMB %p",
369 new_entry, end_of_smb);
383 static void cifs_fill_dirent_unix(struct cifs_dirent *de,
384 const FILE_UNIX_INFO *info, bool is_unicode)
386 de->name = &info->FileName[0];
388 de->namelen = cifs_unicode_bytelen(de->name);
390 de->namelen = strnlen(de->name, PATH_MAX);
391 de->resume_key = info->ResumeKey;
392 de->ino = le64_to_cpu(info->basic.UniqueId);
395 static void cifs_fill_dirent_dir(struct cifs_dirent *de,
396 const FILE_DIRECTORY_INFO *info)
398 de->name = &info->FileName[0];
399 de->namelen = le32_to_cpu(info->FileNameLength);
400 de->resume_key = info->FileIndex;
403 static void cifs_fill_dirent_full(struct cifs_dirent *de,
404 const FILE_FULL_DIRECTORY_INFO *info)
406 de->name = &info->FileName[0];
407 de->namelen = le32_to_cpu(info->FileNameLength);
408 de->resume_key = info->FileIndex;
411 static void cifs_fill_dirent_search(struct cifs_dirent *de,
412 const SEARCH_ID_FULL_DIR_INFO *info)
414 de->name = &info->FileName[0];
415 de->namelen = le32_to_cpu(info->FileNameLength);
416 de->resume_key = info->FileIndex;
417 de->ino = le64_to_cpu(info->UniqueId);
420 static void cifs_fill_dirent_both(struct cifs_dirent *de,
421 const FILE_BOTH_DIRECTORY_INFO *info)
423 de->name = &info->FileName[0];
424 de->namelen = le32_to_cpu(info->FileNameLength);
425 de->resume_key = info->FileIndex;
428 static void cifs_fill_dirent_std(struct cifs_dirent *de,
429 const FIND_FILE_STANDARD_INFO *info)
431 de->name = &info->FileName[0];
432 /* one byte length, no endianess conversion */
433 de->namelen = info->FileNameLength;
434 de->resume_key = info->ResumeKey;
437 static int cifs_fill_dirent(struct cifs_dirent *de, const void *info,
438 u16 level, bool is_unicode)
440 memset(de, 0, sizeof(*de));
443 case SMB_FIND_FILE_UNIX:
444 cifs_fill_dirent_unix(de, info, is_unicode);
446 case SMB_FIND_FILE_DIRECTORY_INFO:
447 cifs_fill_dirent_dir(de, info);
449 case SMB_FIND_FILE_FULL_DIRECTORY_INFO:
450 cifs_fill_dirent_full(de, info);
452 case SMB_FIND_FILE_ID_FULL_DIR_INFO:
453 cifs_fill_dirent_search(de, info);
455 case SMB_FIND_FILE_BOTH_DIRECTORY_INFO:
456 cifs_fill_dirent_both(de, info);
458 case SMB_FIND_FILE_INFO_STANDARD:
459 cifs_fill_dirent_std(de, info);
462 cFYI(1, "Unknown findfirst level %d", level);
469 #define UNICODE_DOT cpu_to_le16(0x2e)
471 /* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
472 static int cifs_entry_is_dot(struct cifs_dirent *de, bool is_unicode)
480 __le16 *ufilename = (__le16 *)de->name;
481 if (de->namelen == 2) {
483 if (ufilename[0] == UNICODE_DOT)
485 } else if (de->namelen == 4) {
487 if (ufilename[0] == UNICODE_DOT &&
488 ufilename[1] == UNICODE_DOT)
492 if (de->namelen == 1) {
493 if (de->name[0] == '.')
495 } else if (de->namelen == 2) {
496 if (de->name[0] == '.' && de->name[1] == '.')
504 /* Check if directory that we are searching has changed so we can decide
505 whether we can use the cached search results from the previous search */
506 static int is_dir_changed(struct file *file)
508 struct inode *inode = file->f_path.dentry->d_inode;
509 struct cifsInodeInfo *cifsInfo = CIFS_I(inode);
511 if (cifsInfo->time == 0)
512 return 1; /* directory was changed, perhaps due to unlink */
518 static int cifs_save_resume_key(const char *current_entry,
519 struct cifsFileInfo *file_info)
521 struct cifs_dirent de;
524 rc = cifs_fill_dirent(&de, current_entry, file_info->srch_inf.info_level,
525 file_info->srch_inf.unicode);
527 file_info->srch_inf.presume_name = de.name;
528 file_info->srch_inf.resume_name_len = de.namelen;
529 file_info->srch_inf.resume_key = de.resume_key;
535 * Find the corresponding entry in the search. Note that the SMB server returns
536 * search entries for . and .. which complicates logic here if we choose to
537 * parse for them and we do not assume that they are located in the findfirst
538 * return buffer. We start counting in the buffer with entry 2 and increment for
539 * every entry (do not increment for . or .. entry).
542 find_cifs_entry(const unsigned int xid, struct cifs_tcon *tcon,
543 struct file *file, char **current_entry, int *num_to_ret)
548 loff_t first_entry_in_buffer;
549 loff_t index_to_find = file->f_pos;
550 struct cifsFileInfo *cfile = file->private_data;
551 struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
552 struct TCP_Server_Info *server = tcon->ses->server;
553 /* check if index in the buffer */
555 if (!server->ops->query_dir_first || !server->ops->query_dir_next)
558 if ((cfile == NULL) || (current_entry == NULL) || (num_to_ret == NULL))
561 *current_entry = NULL;
562 first_entry_in_buffer = cfile->srch_inf.index_of_last_entry -
563 cfile->srch_inf.entries_in_buffer;
566 * If first entry in buf is zero then is first buffer
567 * in search response data which means it is likely . and ..
568 * will be in this buffer, although some servers do not return
569 * . and .. for the root of a drive and for those we need
570 * to start two entries earlier.
573 dump_cifs_file_struct(file, "In fce ");
574 if (((index_to_find < cfile->srch_inf.index_of_last_entry) &&
575 is_dir_changed(file)) || (index_to_find < first_entry_in_buffer)) {
576 /* close and restart search */
577 cFYI(1, "search backing up - close and restart search");
578 spin_lock(&cifs_file_list_lock);
579 if (!cfile->srch_inf.endOfSearch && !cfile->invalidHandle) {
580 cfile->invalidHandle = true;
581 spin_unlock(&cifs_file_list_lock);
582 if (server->ops->close)
583 server->ops->close(xid, tcon, &cfile->fid);
585 spin_unlock(&cifs_file_list_lock);
586 if (cfile->srch_inf.ntwrk_buf_start) {
587 cFYI(1, "freeing SMB ff cache buf on search rewind");
588 if (cfile->srch_inf.smallBuf)
589 cifs_small_buf_release(cfile->srch_inf.
592 cifs_buf_release(cfile->srch_inf.
594 cfile->srch_inf.ntwrk_buf_start = NULL;
596 rc = initiate_cifs_search(xid, file);
598 cFYI(1, "error %d reinitiating a search on rewind",
602 /* FindFirst/Next set last_entry to NULL on malformed reply */
603 if (cfile->srch_inf.last_entry)
604 cifs_save_resume_key(cfile->srch_inf.last_entry, cfile);
607 search_flags = CIFS_SEARCH_CLOSE_AT_END | CIFS_SEARCH_RETURN_RESUME;
608 if (backup_cred(cifs_sb))
609 search_flags |= CIFS_SEARCH_BACKUP_SEARCH;
611 while ((index_to_find >= cfile->srch_inf.index_of_last_entry) &&
612 (rc == 0) && !cfile->srch_inf.endOfSearch) {
613 cFYI(1, "calling findnext2");
614 rc = server->ops->query_dir_next(xid, tcon, &cfile->fid,
617 /* FindFirst/Next set last_entry to NULL on malformed reply */
618 if (cfile->srch_inf.last_entry)
619 cifs_save_resume_key(cfile->srch_inf.last_entry, cfile);
623 if (index_to_find < cfile->srch_inf.index_of_last_entry) {
624 /* we found the buffer that contains the entry */
625 /* scan and find it */
628 char *end_of_smb = cfile->srch_inf.ntwrk_buf_start +
629 server->ops->calc_smb_size(
630 cfile->srch_inf.ntwrk_buf_start);
632 cur_ent = cfile->srch_inf.srch_entries_start;
633 first_entry_in_buffer = cfile->srch_inf.index_of_last_entry
634 - cfile->srch_inf.entries_in_buffer;
635 pos_in_buf = index_to_find - first_entry_in_buffer;
636 cFYI(1, "found entry - pos_in_buf %d", pos_in_buf);
638 for (i = 0; (i < (pos_in_buf)) && (cur_ent != NULL); i++) {
639 /* go entry by entry figuring out which is first */
640 cur_ent = nxt_dir_entry(cur_ent, end_of_smb,
641 cfile->srch_inf.info_level);
643 if ((cur_ent == NULL) && (i < pos_in_buf)) {
644 /* BB fixme - check if we should flag this error */
645 cERROR(1, "reached end of buf searching for pos in buf"
646 " %d index to find %lld rc %d", pos_in_buf,
650 *current_entry = cur_ent;
652 cFYI(1, "index not in buffer - could not findnext into it");
656 if (pos_in_buf >= cfile->srch_inf.entries_in_buffer) {
657 cFYI(1, "can not return entries pos_in_buf beyond last");
660 *num_to_ret = cfile->srch_inf.entries_in_buffer - pos_in_buf;
665 static int cifs_filldir(char *find_entry, struct file *file, filldir_t filldir,
666 void *dirent, char *scratch_buf, unsigned int max_len)
668 struct cifsFileInfo *file_info = file->private_data;
669 struct super_block *sb = file->f_path.dentry->d_sb;
670 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
671 struct cifs_dirent de = { NULL, };
672 struct cifs_fattr fattr;
677 rc = cifs_fill_dirent(&de, find_entry, file_info->srch_inf.info_level,
678 file_info->srch_inf.unicode);
682 if (de.namelen > max_len) {
683 cERROR(1, "bad search response length %zd past smb end",
688 /* skip . and .. since we added them first */
689 if (cifs_entry_is_dot(&de, file_info->srch_inf.unicode))
692 if (file_info->srch_inf.unicode) {
693 struct nls_table *nlt = cifs_sb->local_nls;
695 name.name = scratch_buf;
697 cifs_from_utf16((char *)name.name, (__le16 *)de.name,
699 min_t(size_t, de.namelen,
700 (size_t)max_len), nlt,
701 cifs_sb->mnt_cifs_flags &
702 CIFS_MOUNT_MAP_SPECIAL_CHR);
703 name.len -= nls_nullsize(nlt);
706 name.len = de.namelen;
709 switch (file_info->srch_inf.info_level) {
710 case SMB_FIND_FILE_UNIX:
711 cifs_unix_basic_to_fattr(&fattr,
712 &((FILE_UNIX_INFO *)find_entry)->basic,
715 case SMB_FIND_FILE_INFO_STANDARD:
716 cifs_std_info_to_fattr(&fattr,
717 (FIND_FILE_STANDARD_INFO *)find_entry,
721 cifs_dir_info_to_fattr(&fattr,
722 (FILE_DIRECTORY_INFO *)find_entry,
727 if (de.ino && (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
728 fattr.cf_uniqueid = de.ino;
730 fattr.cf_uniqueid = iunique(sb, ROOT_I);
731 cifs_autodisable_serverino(cifs_sb);
734 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) &&
735 CIFSCouldBeMFSymlink(&fattr))
737 * trying to get the type and mode can be slow,
738 * so just call those regular files for now, and mark
741 fattr.cf_flags |= CIFS_FATTR_NEED_REVAL;
743 cifs_prime_dcache(file->f_dentry, &name, &fattr);
745 ino = cifs_uniqueid_to_ino_t(fattr.cf_uniqueid);
746 rc = filldir(dirent, name.name, name.len, file->f_pos, ino,
752 int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
757 struct cifs_tcon *tcon;
758 struct cifsFileInfo *cifsFile = NULL;
761 char *tmp_buf = NULL;
763 unsigned int max_len;
768 * Ensure FindFirst doesn't fail before doing filldir() for '.' and
769 * '..'. Otherwise we won't be able to notify VFS in case of failure.
771 if (file->private_data == NULL) {
772 rc = initiate_cifs_search(xid, file);
773 cFYI(1, "initiate cifs search rc %d", rc);
778 switch ((int) file->f_pos) {
780 if (filldir(direntry, ".", 1, file->f_pos,
781 file->f_path.dentry->d_inode->i_ino, DT_DIR) < 0) {
782 cERROR(1, "Filldir for current dir failed");
788 if (filldir(direntry, "..", 2, file->f_pos,
789 parent_ino(file->f_path.dentry), DT_DIR) < 0) {
790 cERROR(1, "Filldir for parent dir failed");
796 /* 1) If search is active,
797 is in current search buffer?
798 if it before then restart search
799 if after then keep searching till find it */
801 if (file->private_data == NULL) {
806 cifsFile = file->private_data;
807 if (cifsFile->srch_inf.endOfSearch) {
808 if (cifsFile->srch_inf.emptyDir) {
809 cFYI(1, "End of search, empty dir");
814 cifsFile->invalidHandle = true;
815 tcon->ses->server->close(xid, tcon, &cifsFile->fid);
818 tcon = tlink_tcon(cifsFile->tlink);
819 rc = find_cifs_entry(xid, tcon, file, ¤t_entry,
822 cFYI(1, "fce error %d", rc);
824 } else if (current_entry != NULL) {
825 cFYI(1, "entry %lld found", file->f_pos);
827 cFYI(1, "could not find entry");
830 cFYI(1, "loop through %d times filling dir for net buf %p",
831 num_to_fill, cifsFile->srch_inf.ntwrk_buf_start);
832 max_len = tcon->ses->server->ops->calc_smb_size(
833 cifsFile->srch_inf.ntwrk_buf_start);
834 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len;
836 tmp_buf = kmalloc(UNICODE_NAME_MAX, GFP_KERNEL);
837 if (tmp_buf == NULL) {
842 for (i = 0; (i < num_to_fill) && (rc == 0); i++) {
843 if (current_entry == NULL) {
844 /* evaluate whether this case is an error */
845 cERROR(1, "past SMB end, num to fill %d i %d",
850 * if buggy server returns . and .. late do we want to
851 * check for that here?
853 rc = cifs_filldir(current_entry, file, filldir,
854 direntry, tmp_buf, max_len);
855 if (rc == -EOVERFLOW) {
862 cifsFile->srch_inf.index_of_last_entry) {
863 cFYI(1, "last entry in buf at pos %lld %s",
864 file->f_pos, tmp_buf);
865 cifs_save_resume_key(current_entry, cifsFile);
869 nxt_dir_entry(current_entry, end_of_smb,
870 cifsFile->srch_inf.info_level);