blob: d87f82678bc74f9b6e602262568c8a8679ebac41 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * fs/cifs/readdir.c
3 *
4 * Directory search handling
Steve French6dc0f872007-07-06 23:13:06 +00005 *
Steve Frenchad7a2922008-02-07 23:25:02 +00006 * Copyright (C) International Business Machines Corp., 2004, 2008
Christoph Hellwigcda0ec62011-07-16 15:24:05 -04007 * Copyright (C) Red Hat, Inc., 2011
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 * Author(s): Steve French (sfrench@us.ibm.com)
9 *
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.
14 *
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.
19 *
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
23 */
24#include <linux/fs.h>
Dave Kleikamp273d81d2006-06-01 19:41:23 +000025#include <linux/pagemap.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090026#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#include <linux/stat.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070028#include "cifspdu.h"
29#include "cifsglob.h"
30#include "cifsproto.h"
31#include "cifs_unicode.h"
32#include "cifs_debug.h"
33#include "cifs_fs_sb.h"
34#include "cifsfs.h"
35
Jeff Laytonf5884162009-04-30 07:18:00 -040036/*
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
39 * characters.
40 */
41#define UNICODE_NAME_MAX ((4 * NAME_MAX) + 2)
42
Steve French39798772006-05-31 22:40:51 +000043#ifdef CONFIG_CIFS_DEBUG2
44static void dump_cifs_file_struct(struct file *file, char *label)
Linus Torvalds1da177e2005-04-16 15:20:36 -070045{
Steve French6dc0f872007-07-06 23:13:06 +000046 struct cifsFileInfo *cf;
Linus Torvalds1da177e2005-04-16 15:20:36 -070047
Steve French4523cc32007-04-30 20:13:06 +000048 if (file) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070049 cf = file->private_data;
Steve French4523cc32007-04-30 20:13:06 +000050 if (cf == NULL) {
Joe Perchesb6b38f72010-04-21 03:50:45 +000051 cFYI(1, "empty cifs private file data");
Linus Torvalds1da177e2005-04-16 15:20:36 -070052 return;
53 }
Steve Frenchad7a2922008-02-07 23:25:02 +000054 if (cf->invalidHandle)
Joe Perchesb6b38f72010-04-21 03:50:45 +000055 cFYI(1, "invalid handle");
Steve Frenchad7a2922008-02-07 23:25:02 +000056 if (cf->srch_inf.endOfSearch)
Joe Perchesb6b38f72010-04-21 03:50:45 +000057 cFYI(1, "end of search");
Steve Frenchad7a2922008-02-07 23:25:02 +000058 if (cf->srch_inf.emptyDir)
Joe Perchesb6b38f72010-04-21 03:50:45 +000059 cFYI(1, "empty dir");
Linus Torvalds1da177e2005-04-16 15:20:36 -070060 }
Steve French39798772006-05-31 22:40:51 +000061}
Steve French90c81e02008-02-12 20:32:36 +000062#else
63static inline void dump_cifs_file_struct(struct file *file, char *label)
64{
65}
Steve French39798772006-05-31 22:40:51 +000066#endif /* DEBUG2 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070067
Jeff Laytoncc0bad72009-06-25 00:56:52 -040068/*
69 * Find the dentry that matches "name". If there isn't one, create one. If it's
70 * a negative dentry or the uniqueid changed, then drop it and recreate it.
71 */
72static struct dentry *
73cifs_readdir_lookup(struct dentry *parent, struct qstr *name,
74 struct cifs_fattr *fattr)
75{
76 struct dentry *dentry, *alias;
77 struct inode *inode;
78 struct super_block *sb = parent->d_inode->i_sb;
79
Joe Perchesb6b38f72010-04-21 03:50:45 +000080 cFYI(1, "For %s", name->name);
Jeff Laytoncc0bad72009-06-25 00:56:52 -040081
Jeff Layton05507fa2010-02-05 13:30:36 -050082 if (parent->d_op && parent->d_op->d_hash)
Nick Pigginb1e6a012011-01-07 17:49:28 +110083 parent->d_op->d_hash(parent, parent->d_inode, name);
Jeff Layton05507fa2010-02-05 13:30:36 -050084 else
85 name->hash = full_name_hash(name->name, name->len);
86
Jeff Laytoncc0bad72009-06-25 00:56:52 -040087 dentry = d_lookup(parent, name);
88 if (dentry) {
Jeff Laytoncd600422012-07-06 07:09:42 -040089 inode = dentry->d_inode;
90 /* update inode in place if i_ino didn't change */
91 if (inode && CIFS_I(inode)->uniqueid == fattr->cf_uniqueid) {
92 cifs_fattr_to_inode(inode, fattr);
Jeff Laytoncc0bad72009-06-25 00:56:52 -040093 return dentry;
Jeff Laytoncd600422012-07-06 07:09:42 -040094 }
Jeff Laytoncc0bad72009-06-25 00:56:52 -040095 d_drop(dentry);
96 dput(dentry);
97 }
98
99 dentry = d_alloc(parent, name);
100 if (dentry == NULL)
101 return NULL;
102
103 inode = cifs_iget(sb, fattr);
104 if (!inode) {
105 dput(dentry);
106 return NULL;
107 }
108
Jeff Laytoncc0bad72009-06-25 00:56:52 -0400109 alias = d_materialise_unique(dentry, inode);
110 if (alias != NULL) {
111 dput(dentry);
112 if (IS_ERR(alias))
113 return NULL;
114 dentry = alias;
115 }
116
117 return dentry;
118}
119
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400120static void
121cifs_fill_common_info(struct cifs_fattr *fattr, struct cifs_sb_info *cifs_sb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122{
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400123 fattr->cf_uid = cifs_sb->mnt_uid;
124 fattr->cf_gid = cifs_sb->mnt_gid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400126 if (fattr->cf_cifsattrs & ATTR_DIRECTORY) {
127 fattr->cf_mode = S_IFDIR | cifs_sb->mnt_dir_mode;
128 fattr->cf_dtype = DT_DIR;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129 } else {
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400130 fattr->cf_mode = S_IFREG | cifs_sb->mnt_file_mode;
131 fattr->cf_dtype = DT_REG;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132 }
133
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400134 if (fattr->cf_cifsattrs & ATTR_READONLY)
135 fattr->cf_mode &= ~S_IWUGO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400137 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL &&
138 fattr->cf_cifsattrs & ATTR_SYSTEM) {
139 if (fattr->cf_eof == 0) {
140 fattr->cf_mode &= ~S_IFMT;
141 fattr->cf_mode |= S_IFIFO;
142 fattr->cf_dtype = DT_FIFO;
Steve French3020a1f2005-11-18 11:31:10 -0800143 } else {
Jeff Layton4468eb32008-05-22 09:31:40 -0400144 /*
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400145 * trying to get the type and mode via SFU can be slow,
146 * so just call those regular files for now, and mark
147 * for reval
Jeff Layton4468eb32008-05-22 09:31:40 -0400148 */
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400149 fattr->cf_flags |= CIFS_FATTR_NEED_REVAL;
Jeff Layton4468eb32008-05-22 09:31:40 -0400150 }
151 }
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400152}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153
Steve French15dd4782009-09-25 02:24:45 +0000154static void
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400155cifs_dir_info_to_fattr(struct cifs_fattr *fattr, FILE_DIRECTORY_INFO *info,
156 struct cifs_sb_info *cifs_sb)
157{
158 memset(fattr, 0, sizeof(*fattr));
159 fattr->cf_cifsattrs = le32_to_cpu(info->ExtFileAttributes);
160 fattr->cf_eof = le64_to_cpu(info->EndOfFile);
161 fattr->cf_bytes = le64_to_cpu(info->AllocationSize);
Jeff Layton20054bd2011-01-07 11:30:27 -0500162 fattr->cf_createtime = le64_to_cpu(info->CreationTime);
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400163 fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
164 fattr->cf_ctime = cifs_NTtimeToUnix(info->ChangeTime);
165 fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400167 cifs_fill_common_info(fattr, cifs_sb);
168}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169
Steve French15dd4782009-09-25 02:24:45 +0000170static void
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400171cifs_std_info_to_fattr(struct cifs_fattr *fattr, FIND_FILE_STANDARD_INFO *info,
172 struct cifs_sb_info *cifs_sb)
173{
Jeff Layton0d424ad2010-09-20 16:01:35 -0700174 int offset = cifs_sb_master_tcon(cifs_sb)->ses->server->timeAdj;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400176 memset(fattr, 0, sizeof(*fattr));
177 fattr->cf_atime = cnvrtDosUnixTm(info->LastAccessDate,
178 info->LastAccessTime, offset);
179 fattr->cf_ctime = cnvrtDosUnixTm(info->LastWriteDate,
180 info->LastWriteTime, offset);
181 fattr->cf_mtime = cnvrtDosUnixTm(info->LastWriteDate,
182 info->LastWriteTime, offset);
Steve Frenchf3f6ec42006-01-08 20:12:58 -0800183
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400184 fattr->cf_cifsattrs = le16_to_cpu(info->Attributes);
185 fattr->cf_bytes = le32_to_cpu(info->AllocationSize);
186 fattr->cf_eof = le32_to_cpu(info->DataSize);
Dave Kleikamp273d81d2006-06-01 19:41:23 +0000187
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400188 cifs_fill_common_info(fattr, cifs_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189}
190
Steve French0e0d2cf2009-05-01 05:27:32 +0000191/* BB eventually need to add the following helper function to
192 resolve NT_STATUS_STOPPED_ON_SYMLINK return code when
193 we try to do FindFirst on (NTFS) directory symlinks */
194/*
195int get_symlink_reparse_path(char *full_path, struct cifs_sb_info *cifs_sb,
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400196 unsigned int xid)
Steve French0e0d2cf2009-05-01 05:27:32 +0000197{
198 __u16 fid;
199 int len;
200 int oplock = 0;
201 int rc;
Steve French96daf2b2011-05-27 04:34:02 +0000202 struct cifs_tcon *ptcon = cifs_sb_tcon(cifs_sb);
Steve French0e0d2cf2009-05-01 05:27:32 +0000203 char *tmpbuffer;
204
205 rc = CIFSSMBOpen(xid, ptcon, full_path, FILE_OPEN, GENERIC_READ,
206 OPEN_REPARSE_POINT, &fid, &oplock, NULL,
207 cifs_sb->local_nls,
208 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
209 if (!rc) {
210 tmpbuffer = kmalloc(maxpath);
211 rc = CIFSSMBQueryReparseLinkInfo(xid, ptcon, full_path,
212 tmpbuffer,
213 maxpath -1,
214 fid,
215 cifs_sb->local_nls);
216 if (CIFSSMBClose(xid, ptcon, fid)) {
Joe Perchesb6b38f72010-04-21 03:50:45 +0000217 cFYI(1, "Error closing temporary reparsepoint open");
Steve French0e0d2cf2009-05-01 05:27:32 +0000218 }
219 }
220}
221 */
222
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400223static int initiate_cifs_search(const unsigned int xid, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224{
Shirish Pargaonkar2608bee2012-05-15 10:19:16 -0500225 __u16 search_flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 int rc = 0;
Jeff Layton7ffec372010-09-29 19:51:11 -0400227 char *full_path = NULL;
Steve French38702532007-07-08 15:40:40 +0000228 struct cifsFileInfo *cifsFile;
Jeff Layton7ffec372010-09-29 19:51:11 -0400229 struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
Jeff Layton59c55ba2010-11-12 06:30:29 -0500230 struct tcon_link *tlink = NULL;
Pavel Shilovsky29e20f92012-07-13 13:58:14 +0400231 struct cifs_tcon *tcon;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232
Jeff Layton7ffec372010-09-29 19:51:11 -0400233 if (file->private_data == NULL) {
Jeff Layton59c55ba2010-11-12 06:30:29 -0500234 tlink = cifs_sb_tlink(cifs_sb);
235 if (IS_ERR(tlink))
236 return PTR_ERR(tlink);
237
238 cifsFile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
239 if (cifsFile == NULL) {
240 rc = -ENOMEM;
241 goto error_exit;
242 }
243 file->private_data = cifsFile;
244 cifsFile->tlink = cifs_get_tlink(tlink);
Pavel Shilovsky29e20f92012-07-13 13:58:14 +0400245 tcon = tlink_tcon(tlink);
Jeff Layton59c55ba2010-11-12 06:30:29 -0500246 } else {
247 cifsFile = file->private_data;
Pavel Shilovsky29e20f92012-07-13 13:58:14 +0400248 tcon = tlink_tcon(cifsFile->tlink);
Jeff Layton7ffec372010-09-29 19:51:11 -0400249 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250
Steve French4b18f2a2008-04-29 00:06:05 +0000251 cifsFile->invalidHandle = true;
252 cifsFile->srch_inf.endOfSearch = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253
Josef "Jeff" Sipeke6a00292006-12-08 02:36:48 -0800254 full_path = build_path_from_dentry(file->f_path.dentry);
Jeff Layton7ffec372010-09-29 19:51:11 -0400255 if (full_path == NULL) {
256 rc = -ENOMEM;
257 goto error_exit;
258 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259
Joe Perchesb6b38f72010-04-21 03:50:45 +0000260 cFYI(1, "Full path: %s start at: %lld", full_path, file->f_pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261
Steve French75cf6bd2005-04-28 22:41:04 -0700262ffirst_retry:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 /* test for Unix extensions */
Steve Frenchc18c8422007-07-18 23:21:09 +0000264 /* but now check for them on the share/mount not on the SMB session */
Pavel Shilovsky29e20f92012-07-13 13:58:14 +0400265 /* if (cap_unix(tcon->ses) { */
266 if (tcon->unix_ext)
Steve French5bafd762006-06-07 00:18:43 +0000267 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
Pavel Shilovsky29e20f92012-07-13 13:58:14 +0400268 else if ((tcon->ses->capabilities &
269 tcon->ses->server->vals->cap_nt_find) == 0) {
Steve French5bafd762006-06-07 00:18:43 +0000270 cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
272 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
273 } else /* not srvinos - BB fixme add check for backlevel? */ {
274 cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
275 }
276
Shirish Pargaonkar2608bee2012-05-15 10:19:16 -0500277 search_flags = CIFS_SEARCH_CLOSE_AT_END | CIFS_SEARCH_RETURN_RESUME;
278 if (backup_cred(cifs_sb))
279 search_flags |= CIFS_SEARCH_BACKUP_SEARCH;
280
Pavel Shilovsky29e20f92012-07-13 13:58:14 +0400281 rc = CIFSFindFirst(xid, tcon, full_path, cifs_sb->local_nls,
Shirish Pargaonkar2608bee2012-05-15 10:19:16 -0500282 &cifsFile->netfid, search_flags, &cifsFile->srch_inf,
Steve French38702532007-07-08 15:40:40 +0000283 cifs_sb->mnt_cifs_flags &
Steve Frencheafe8702005-09-15 21:47:30 -0700284 CIFS_MOUNT_MAP_SPECIAL_CHR, CIFS_DIR_SEP(cifs_sb));
Steve French4523cc32007-04-30 20:13:06 +0000285 if (rc == 0)
Steve French4b18f2a2008-04-29 00:06:05 +0000286 cifsFile->invalidHandle = false;
Steve Frenche836f012009-05-01 16:20:35 +0000287 /* BB add following call to handle readdir on new NTFS symlink errors
Steve French0e0d2cf2009-05-01 05:27:32 +0000288 else if STATUS_STOPPED_ON_SYMLINK
289 call get_symlink_reparse_path and retry with new path */
290 else if ((rc == -EOPNOTSUPP) &&
Steve French75cf6bd2005-04-28 22:41:04 -0700291 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
292 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
293 goto ffirst_retry;
294 }
Jeff Layton7ffec372010-09-29 19:51:11 -0400295error_exit:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 kfree(full_path);
Jeff Layton7ffec372010-09-29 19:51:11 -0400297 cifs_put_tlink(tlink);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298 return rc;
299}
300
301/* return length of unicode string in bytes */
Christoph Hellwigcda0ec62011-07-16 15:24:05 -0400302static int cifs_unicode_bytelen(const char *str)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303{
304 int len;
Christoph Hellwigcda0ec62011-07-16 15:24:05 -0400305 const __le16 *ustr = (const __le16 *)str;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306
Steve French38702532007-07-08 15:40:40 +0000307 for (len = 0; len <= PATH_MAX; len++) {
Steve French4523cc32007-04-30 20:13:06 +0000308 if (ustr[len] == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309 return len << 1;
310 }
Joe Perchesb6b38f72010-04-21 03:50:45 +0000311 cFYI(1, "Unicode string longer than PATH_MAX found");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 return len << 1;
313}
314
Steve French5bafd762006-06-07 00:18:43 +0000315static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316{
Steve French38702532007-07-08 15:40:40 +0000317 char *new_entry;
Steve Frenchad7a2922008-02-07 23:25:02 +0000318 FILE_DIRECTORY_INFO *pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319
Steve French4523cc32007-04-30 20:13:06 +0000320 if (level == SMB_FIND_FILE_INFO_STANDARD) {
Steve Frenchad7a2922008-02-07 23:25:02 +0000321 FIND_FILE_STANDARD_INFO *pfData;
Steve French5bafd762006-06-07 00:18:43 +0000322 pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo;
323
324 new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) +
325 pfData->FileNameLength;
326 } else
327 new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
Joe Perchesb6b38f72010-04-21 03:50:45 +0000328 cFYI(1, "new entry %p old entry %p", new_entry, old_entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329 /* validate that new_entry is not past end of SMB */
Steve French4523cc32007-04-30 20:13:06 +0000330 if (new_entry >= end_of_smb) {
Joe Perchesb6b38f72010-04-21 03:50:45 +0000331 cERROR(1, "search entry %p began after end of SMB %p old entry %p",
332 new_entry, end_of_smb, old_entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333 return NULL;
Steve French4523cc32007-04-30 20:13:06 +0000334 } else if (((level == SMB_FIND_FILE_INFO_STANDARD) &&
Steve French38702532007-07-08 15:40:40 +0000335 (new_entry + sizeof(FIND_FILE_STANDARD_INFO) > end_of_smb))
336 || ((level != SMB_FIND_FILE_INFO_STANDARD) &&
Steve French5bafd762006-06-07 00:18:43 +0000337 (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb))) {
Joe Perchesb6b38f72010-04-21 03:50:45 +0000338 cERROR(1, "search entry %p extends after end of SMB %p",
339 new_entry, end_of_smb);
Steve French09d1db52005-04-28 22:41:08 -0700340 return NULL;
Steve French38702532007-07-08 15:40:40 +0000341 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342 return new_entry;
343
344}
345
Christoph Hellwigcda0ec62011-07-16 15:24:05 -0400346struct cifs_dirent {
347 const char *name;
348 size_t namelen;
349 u32 resume_key;
350 u64 ino;
351};
352
353static void cifs_fill_dirent_unix(struct cifs_dirent *de,
354 const FILE_UNIX_INFO *info, bool is_unicode)
355{
356 de->name = &info->FileName[0];
357 if (is_unicode)
358 de->namelen = cifs_unicode_bytelen(de->name);
359 else
360 de->namelen = strnlen(de->name, PATH_MAX);
361 de->resume_key = info->ResumeKey;
362 de->ino = le64_to_cpu(info->basic.UniqueId);
363}
364
365static void cifs_fill_dirent_dir(struct cifs_dirent *de,
366 const FILE_DIRECTORY_INFO *info)
367{
368 de->name = &info->FileName[0];
369 de->namelen = le32_to_cpu(info->FileNameLength);
370 de->resume_key = info->FileIndex;
371}
372
373static void cifs_fill_dirent_full(struct cifs_dirent *de,
374 const FILE_FULL_DIRECTORY_INFO *info)
375{
376 de->name = &info->FileName[0];
377 de->namelen = le32_to_cpu(info->FileNameLength);
378 de->resume_key = info->FileIndex;
379}
380
381static void cifs_fill_dirent_search(struct cifs_dirent *de,
382 const SEARCH_ID_FULL_DIR_INFO *info)
383{
384 de->name = &info->FileName[0];
385 de->namelen = le32_to_cpu(info->FileNameLength);
386 de->resume_key = info->FileIndex;
387 de->ino = le64_to_cpu(info->UniqueId);
388}
389
390static void cifs_fill_dirent_both(struct cifs_dirent *de,
391 const FILE_BOTH_DIRECTORY_INFO *info)
392{
393 de->name = &info->FileName[0];
394 de->namelen = le32_to_cpu(info->FileNameLength);
395 de->resume_key = info->FileIndex;
396}
397
398static void cifs_fill_dirent_std(struct cifs_dirent *de,
399 const FIND_FILE_STANDARD_INFO *info)
400{
401 de->name = &info->FileName[0];
402 /* one byte length, no endianess conversion */
403 de->namelen = info->FileNameLength;
404 de->resume_key = info->ResumeKey;
405}
406
407static int cifs_fill_dirent(struct cifs_dirent *de, const void *info,
408 u16 level, bool is_unicode)
409{
410 memset(de, 0, sizeof(*de));
411
412 switch (level) {
413 case SMB_FIND_FILE_UNIX:
414 cifs_fill_dirent_unix(de, info, is_unicode);
415 break;
416 case SMB_FIND_FILE_DIRECTORY_INFO:
417 cifs_fill_dirent_dir(de, info);
418 break;
419 case SMB_FIND_FILE_FULL_DIRECTORY_INFO:
420 cifs_fill_dirent_full(de, info);
421 break;
422 case SMB_FIND_FILE_ID_FULL_DIR_INFO:
423 cifs_fill_dirent_search(de, info);
424 break;
425 case SMB_FIND_FILE_BOTH_DIRECTORY_INFO:
426 cifs_fill_dirent_both(de, info);
427 break;
428 case SMB_FIND_FILE_INFO_STANDARD:
429 cifs_fill_dirent_std(de, info);
430 break;
431 default:
432 cFYI(1, "Unknown findfirst level %d", level);
433 return -EINVAL;
434 }
435
436 return 0;
437}
438
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439#define UNICODE_DOT cpu_to_le16(0x2e)
440
441/* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
Christoph Hellwigcda0ec62011-07-16 15:24:05 -0400442static int cifs_entry_is_dot(struct cifs_dirent *de, bool is_unicode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443{
444 int rc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445
Christoph Hellwigcda0ec62011-07-16 15:24:05 -0400446 if (!de->name)
447 return 0;
448
449 if (is_unicode) {
450 __le16 *ufilename = (__le16 *)de->name;
451 if (de->namelen == 2) {
452 /* check for . */
453 if (ufilename[0] == UNICODE_DOT)
454 rc = 1;
455 } else if (de->namelen == 4) {
456 /* check for .. */
457 if (ufilename[0] == UNICODE_DOT &&
458 ufilename[1] == UNICODE_DOT)
459 rc = 2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460 }
Christoph Hellwigcda0ec62011-07-16 15:24:05 -0400461 } else /* ASCII */ {
462 if (de->namelen == 1) {
463 if (de->name[0] == '.')
464 rc = 1;
465 } else if (de->namelen == 2) {
466 if (de->name[0] == '.' && de->name[1] == '.')
467 rc = 2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468 }
469 }
470
471 return rc;
472}
473
Steve Frencheafe8702005-09-15 21:47:30 -0700474/* Check if directory that we are searching has changed so we can decide
475 whether we can use the cached search results from the previous search */
Steve French38702532007-07-08 15:40:40 +0000476static int is_dir_changed(struct file *file)
Steve Frencheafe8702005-09-15 21:47:30 -0700477{
Christoph Hellwigc33f8d32007-04-02 18:47:20 +0000478 struct inode *inode = file->f_path.dentry->d_inode;
479 struct cifsInodeInfo *cifsInfo = CIFS_I(inode);
Steve Frencheafe8702005-09-15 21:47:30 -0700480
Christoph Hellwigc33f8d32007-04-02 18:47:20 +0000481 if (cifsInfo->time == 0)
Steve Frencheafe8702005-09-15 21:47:30 -0700482 return 1; /* directory was changed, perhaps due to unlink */
483 else
484 return 0;
485
486}
487
Steve French0752f152008-10-07 20:03:33 +0000488static int cifs_save_resume_key(const char *current_entry,
Christoph Hellwigeaf35b12011-07-16 15:24:37 -0400489 struct cifsFileInfo *file_info)
Steve French0752f152008-10-07 20:03:33 +0000490{
Christoph Hellwigeaf35b12011-07-16 15:24:37 -0400491 struct cifs_dirent de;
492 int rc;
Steve French0752f152008-10-07 20:03:33 +0000493
Christoph Hellwigeaf35b12011-07-16 15:24:37 -0400494 rc = cifs_fill_dirent(&de, current_entry, file_info->srch_inf.info_level,
495 file_info->srch_inf.unicode);
496 if (!rc) {
497 file_info->srch_inf.presume_name = de.name;
498 file_info->srch_inf.resume_name_len = de.namelen;
499 file_info->srch_inf.resume_key = de.resume_key;
Steve French0752f152008-10-07 20:03:33 +0000500 }
Steve French0752f152008-10-07 20:03:33 +0000501 return rc;
502}
503
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504/* find the corresponding entry in the search */
505/* Note that the SMB server returns search entries for . and .. which
506 complicates logic here if we choose to parse for them and we do not
507 assume that they are located in the findfirst return buffer.*/
508/* We start counting in the buffer with entry 2 and increment for every
509 entry (do not increment for . or .. entry) */
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400510static int find_cifs_entry(const unsigned int xid, struct cifs_tcon *pTcon,
Steve French38702532007-07-08 15:40:40 +0000511 struct file *file, char **ppCurrentEntry, int *num_to_ret)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512{
Shirish Pargaonkar2608bee2012-05-15 10:19:16 -0500513 __u16 search_flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514 int rc = 0;
515 int pos_in_buf = 0;
516 loff_t first_entry_in_buffer;
517 loff_t index_to_find = file->f_pos;
Steve French38702532007-07-08 15:40:40 +0000518 struct cifsFileInfo *cifsFile = file->private_data;
Shirish Pargaonkar2608bee2012-05-15 10:19:16 -0500519 struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520 /* check if index in the buffer */
Steve French50c2f752007-07-13 00:33:32 +0000521
Steve French38702532007-07-08 15:40:40 +0000522 if ((cifsFile == NULL) || (ppCurrentEntry == NULL) ||
Steve Frencheafe8702005-09-15 21:47:30 -0700523 (num_to_ret == NULL))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524 return -ENOENT;
Steve French50c2f752007-07-13 00:33:32 +0000525
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526 *ppCurrentEntry = NULL;
Steve French38702532007-07-08 15:40:40 +0000527 first_entry_in_buffer =
528 cifsFile->srch_inf.index_of_last_entry -
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529 cifsFile->srch_inf.entries_in_buffer;
Steve French60808232006-04-22 15:53:05 +0000530
531 /* if first entry in buf is zero then is first buffer
532 in search response data which means it is likely . and ..
533 will be in this buffer, although some servers do not return
534 . and .. for the root of a drive and for those we need
535 to start two entries earlier */
536
Steve French39798772006-05-31 22:40:51 +0000537 dump_cifs_file_struct(file, "In fce ");
Steve French38702532007-07-08 15:40:40 +0000538 if (((index_to_find < cifsFile->srch_inf.index_of_last_entry) &&
539 is_dir_changed(file)) ||
Steve Frencheafe8702005-09-15 21:47:30 -0700540 (index_to_find < first_entry_in_buffer)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541 /* close and restart search */
Joe Perchesb6b38f72010-04-21 03:50:45 +0000542 cFYI(1, "search backing up - close and restart search");
Jeff Layton44772882010-10-15 15:34:03 -0400543 spin_lock(&cifs_file_list_lock);
Steve French77c57ec2008-05-13 21:39:32 +0000544 if (!cifsFile->srch_inf.endOfSearch &&
545 !cifsFile->invalidHandle) {
546 cifsFile->invalidHandle = true;
Jeff Layton44772882010-10-15 15:34:03 -0400547 spin_unlock(&cifs_file_list_lock);
Steve French77c57ec2008-05-13 21:39:32 +0000548 CIFSFindClose(xid, pTcon, cifsFile->netfid);
Steve Frenchddb4cbf2008-11-20 20:00:44 +0000549 } else
Jeff Layton44772882010-10-15 15:34:03 -0400550 spin_unlock(&cifs_file_list_lock);
Steve French4523cc32007-04-30 20:13:06 +0000551 if (cifsFile->srch_inf.ntwrk_buf_start) {
Joe Perchesb6b38f72010-04-21 03:50:45 +0000552 cFYI(1, "freeing SMB ff cache buf on search rewind");
Steve French4523cc32007-04-30 20:13:06 +0000553 if (cifsFile->srch_inf.smallBuf)
Steve Frenchd47d7c12006-02-28 03:45:48 +0000554 cifs_small_buf_release(cifsFile->srch_inf.
555 ntwrk_buf_start);
556 else
557 cifs_buf_release(cifsFile->srch_inf.
558 ntwrk_buf_start);
Shirish Pargaonkar76c510a2008-07-24 14:48:33 +0000559 cifsFile->srch_inf.ntwrk_buf_start = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560 }
Steve French38702532007-07-08 15:40:40 +0000561 rc = initiate_cifs_search(xid, file);
Steve French4523cc32007-04-30 20:13:06 +0000562 if (rc) {
Joe Perchesb6b38f72010-04-21 03:50:45 +0000563 cFYI(1, "error %d reinitiating a search on rewind",
564 rc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565 return rc;
566 }
Jeff Layton70236762011-12-01 20:23:34 -0500567 /* FindFirst/Next set last_entry to NULL on malformed reply */
568 if (cifsFile->srch_inf.last_entry)
569 cifs_save_resume_key(cifsFile->srch_inf.last_entry,
570 cifsFile);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571 }
572
Shirish Pargaonkar2608bee2012-05-15 10:19:16 -0500573 search_flags = CIFS_SEARCH_CLOSE_AT_END | CIFS_SEARCH_RETURN_RESUME;
574 if (backup_cred(cifs_sb))
575 search_flags |= CIFS_SEARCH_BACKUP_SEARCH;
576
Steve French38702532007-07-08 15:40:40 +0000577 while ((index_to_find >= cifsFile->srch_inf.index_of_last_entry) &&
Steve French4b18f2a2008-04-29 00:06:05 +0000578 (rc == 0) && !cifsFile->srch_inf.endOfSearch) {
Joe Perchesb6b38f72010-04-21 03:50:45 +0000579 cFYI(1, "calling findnext2");
Shirish Pargaonkar2608bee2012-05-15 10:19:16 -0500580 rc = CIFSFindNext(xid, pTcon, cifsFile->netfid, search_flags,
Steve Frenchdfb75332005-06-22 17:13:47 -0700581 &cifsFile->srch_inf);
Jeff Layton70236762011-12-01 20:23:34 -0500582 /* FindFirst/Next set last_entry to NULL on malformed reply */
583 if (cifsFile->srch_inf.last_entry)
584 cifs_save_resume_key(cifsFile->srch_inf.last_entry,
585 cifsFile);
Steve French4523cc32007-04-30 20:13:06 +0000586 if (rc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587 return -ENOENT;
588 }
Steve French4523cc32007-04-30 20:13:06 +0000589 if (index_to_find < cifsFile->srch_inf.index_of_last_entry) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590 /* we found the buffer that contains the entry */
591 /* scan and find it */
592 int i;
Steve French38702532007-07-08 15:40:40 +0000593 char *current_entry;
594 char *end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595 smbCalcSize((struct smb_hdr *)
596 cifsFile->srch_inf.ntwrk_buf_start);
Steve French60808232006-04-22 15:53:05 +0000597
598 current_entry = cifsFile->srch_inf.srch_entries_start;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599 first_entry_in_buffer = cifsFile->srch_inf.index_of_last_entry
600 - cifsFile->srch_inf.entries_in_buffer;
601 pos_in_buf = index_to_find - first_entry_in_buffer;
Joe Perchesb6b38f72010-04-21 03:50:45 +0000602 cFYI(1, "found entry - pos_in_buf %d", pos_in_buf);
Steve French5bafd762006-06-07 00:18:43 +0000603
Steve Frenchad7a2922008-02-07 23:25:02 +0000604 for (i = 0; (i < (pos_in_buf)) && (current_entry != NULL); i++) {
Steve Frenchdfb75332005-06-22 17:13:47 -0700605 /* go entry by entry figuring out which is first */
Steve French38702532007-07-08 15:40:40 +0000606 current_entry = nxt_dir_entry(current_entry, end_of_smb,
Steve French5bafd762006-06-07 00:18:43 +0000607 cifsFile->srch_inf.info_level);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608 }
Steve French790fe572007-07-07 19:25:05 +0000609 if ((current_entry == NULL) && (i < pos_in_buf)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610 /* BB fixme - check if we should flag this error */
Joe Perchesb6b38f72010-04-21 03:50:45 +0000611 cERROR(1, "reached end of buf searching for pos in buf"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612 " %d index to find %lld rc %d",
Joe Perchesb6b38f72010-04-21 03:50:45 +0000613 pos_in_buf, index_to_find, rc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614 }
615 rc = 0;
616 *ppCurrentEntry = current_entry;
617 } else {
Joe Perchesb6b38f72010-04-21 03:50:45 +0000618 cFYI(1, "index not in buffer - could not findnext into it");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619 return 0;
620 }
621
Steve French790fe572007-07-07 19:25:05 +0000622 if (pos_in_buf >= cifsFile->srch_inf.entries_in_buffer) {
Joe Perchesb6b38f72010-04-21 03:50:45 +0000623 cFYI(1, "can not return entries pos_in_buf beyond last");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624 *num_to_ret = 0;
625 } else
626 *num_to_ret = cifsFile->srch_inf.entries_in_buffer - pos_in_buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627
628 return rc;
629}
630
Christoph Hellwig9feed6f2011-07-16 15:23:49 -0400631static int cifs_filldir(char *find_entry, struct file *file, filldir_t filldir,
632 void *dirent, char *scratch_buf, unsigned int max_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633{
Christoph Hellwig9feed6f2011-07-16 15:23:49 -0400634 struct cifsFileInfo *file_info = file->private_data;
635 struct super_block *sb = file->f_path.dentry->d_sb;
636 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
Christoph Hellwigcda0ec62011-07-16 15:24:05 -0400637 struct cifs_dirent de = { NULL, };
Jeff Laytoncc0bad72009-06-25 00:56:52 -0400638 struct cifs_fattr fattr;
Christoph Hellwig9feed6f2011-07-16 15:23:49 -0400639 struct dentry *dentry;
640 struct qstr name;
641 int rc = 0;
Christoph Hellwig9feed6f2011-07-16 15:23:49 -0400642 ino_t ino;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643
Christoph Hellwigcda0ec62011-07-16 15:24:05 -0400644 rc = cifs_fill_dirent(&de, find_entry, file_info->srch_inf.info_level,
645 file_info->srch_inf.unicode);
Steve French790fe572007-07-07 19:25:05 +0000646 if (rc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647 return rc;
648
Christoph Hellwigf16d59b2011-07-16 15:24:22 -0400649 if (de.namelen > max_len) {
650 cERROR(1, "bad search response length %zd past smb end",
651 de.namelen);
652 return -EINVAL;
653 }
Jeff Layton132ac7b2009-02-10 07:33:57 -0500654
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655 /* skip . and .. since we added them first */
Christoph Hellwigcda0ec62011-07-16 15:24:05 -0400656 if (cifs_entry_is_dot(&de, file_info->srch_inf.unicode))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657 return 0;
658
Christoph Hellwigf16d59b2011-07-16 15:24:22 -0400659 if (file_info->srch_inf.unicode) {
660 struct nls_table *nlt = cifs_sb->local_nls;
661
662 name.name = scratch_buf;
663 name.len =
Steve Frenchacbbb762012-01-18 22:32:33 -0600664 cifs_from_utf16((char *)name.name, (__le16 *)de.name,
665 UNICODE_NAME_MAX,
666 min_t(size_t, de.namelen,
667 (size_t)max_len), nlt,
668 cifs_sb->mnt_cifs_flags &
Christoph Hellwigf16d59b2011-07-16 15:24:22 -0400669 CIFS_MOUNT_MAP_SPECIAL_CHR);
670 name.len -= nls_nullsize(nlt);
671 } else {
672 name.name = de.name;
673 name.len = de.namelen;
674 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700675
Christoph Hellwig9feed6f2011-07-16 15:23:49 -0400676 switch (file_info->srch_inf.info_level) {
677 case SMB_FIND_FILE_UNIX:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678 cifs_unix_basic_to_fattr(&fattr,
Christoph Hellwig9feed6f2011-07-16 15:23:49 -0400679 &((FILE_UNIX_INFO *)find_entry)->basic,
680 cifs_sb);
681 break;
682 case SMB_FIND_FILE_INFO_STANDARD:
683 cifs_std_info_to_fattr(&fattr,
684 (FIND_FILE_STANDARD_INFO *)find_entry,
685 cifs_sb);
686 break;
687 default:
688 cifs_dir_info_to_fattr(&fattr,
689 (FILE_DIRECTORY_INFO *)find_entry,
690 cifs_sb);
691 break;
692 }
Steve French38702532007-07-08 15:40:40 +0000693
Christoph Hellwigf16d59b2011-07-16 15:24:22 -0400694 if (de.ino && (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
695 fattr.cf_uniqueid = de.ino;
Jeff Laytonec06aed2009-11-06 14:18:29 -0500696 } else {
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400697 fattr.cf_uniqueid = iunique(sb, ROOT_I);
Jeff Laytonec06aed2009-11-06 14:18:29 -0500698 cifs_autodisable_serverino(cifs_sb);
699 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700
Stefan Metzmacher1b12b9c2010-08-05 21:19:56 +0200701 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) &&
702 CIFSCouldBeMFSymlink(&fattr))
703 /*
704 * trying to get the type and mode can be slow,
705 * so just call those regular files for now, and mark
706 * for reval
707 */
708 fattr.cf_flags |= CIFS_FATTR_NEED_REVAL;
709
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400710 ino = cifs_uniqueid_to_ino_t(fattr.cf_uniqueid);
Christoph Hellwig9feed6f2011-07-16 15:23:49 -0400711 dentry = cifs_readdir_lookup(file->f_dentry, &name, &fattr);
Steve French50c2f752007-07-13 00:33:32 +0000712
Christoph Hellwig9feed6f2011-07-16 15:23:49 -0400713 rc = filldir(dirent, name.name, name.len, file->f_pos, ino,
714 fattr.cf_dtype);
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400715
Christoph Hellwig9feed6f2011-07-16 15:23:49 -0400716 dput(dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717 return rc;
718}
719
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720
721int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
722{
723 int rc = 0;
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400724 unsigned int xid;
725 int i;
Steve French96daf2b2011-05-27 04:34:02 +0000726 struct cifs_tcon *pTcon;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727 struct cifsFileInfo *cifsFile = NULL;
Steve French38702532007-07-08 15:40:40 +0000728 char *current_entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729 int num_to_fill = 0;
Steve French38702532007-07-08 15:40:40 +0000730 char *tmp_buf = NULL;
Steve French50c2f752007-07-13 00:33:32 +0000731 char *end_of_smb;
Jeff Layton18295792009-04-30 20:45:45 -0400732 unsigned int max_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400734 xid = get_xid();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735
Suresh Jayaraman6221ddd2010-10-01 21:23:33 +0530736 /*
737 * Ensure FindFirst doesn't fail before doing filldir() for '.' and
738 * '..'. Otherwise we won't be able to notify VFS in case of failure.
739 */
740 if (file->private_data == NULL) {
741 rc = initiate_cifs_search(xid, file);
742 cFYI(1, "initiate cifs search rc %d", rc);
743 if (rc)
744 goto rddir2_exit;
745 }
746
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747 switch ((int) file->f_pos) {
748 case 0:
Steve French60808232006-04-22 15:53:05 +0000749 if (filldir(direntry, ".", 1, file->f_pos,
Josef "Jeff" Sipeke6a00292006-12-08 02:36:48 -0800750 file->f_path.dentry->d_inode->i_ino, DT_DIR) < 0) {
Joe Perchesb6b38f72010-04-21 03:50:45 +0000751 cERROR(1, "Filldir for current dir failed");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752 rc = -ENOMEM;
753 break;
754 }
Steve French60808232006-04-22 15:53:05 +0000755 file->f_pos++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756 case 1:
Steve French60808232006-04-22 15:53:05 +0000757 if (filldir(direntry, "..", 2, file->f_pos,
Al Virob85fd6b2011-07-17 11:19:44 -0400758 parent_ino(file->f_path.dentry), DT_DIR) < 0) {
Joe Perchesb6b38f72010-04-21 03:50:45 +0000759 cERROR(1, "Filldir for parent dir failed");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760 rc = -ENOMEM;
761 break;
762 }
Steve French60808232006-04-22 15:53:05 +0000763 file->f_pos++;
764 default:
Steve French38702532007-07-08 15:40:40 +0000765 /* 1) If search is active,
766 is in current search buffer?
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767 if it before then restart search
768 if after then keep searching till find it */
769
Steve French790fe572007-07-07 19:25:05 +0000770 if (file->private_data == NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771 rc = -EINVAL;
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400772 free_xid(xid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773 return rc;
774 }
775 cifsFile = file->private_data;
776 if (cifsFile->srch_inf.endOfSearch) {
Steve French790fe572007-07-07 19:25:05 +0000777 if (cifsFile->srch_inf.emptyDir) {
Joe Perchesb6b38f72010-04-21 03:50:45 +0000778 cFYI(1, "End of search, empty dir");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779 rc = 0;
780 break;
781 }
782 } /* else {
Steve French4b18f2a2008-04-29 00:06:05 +0000783 cifsFile->invalidHandle = true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784 CIFSFindClose(xid, pTcon, cifsFile->netfid);
Steve Frenchaaa9bbe2008-05-23 17:38:32 +0000785 } */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786
Jeff Layton13cfb732010-09-29 19:51:11 -0400787 pTcon = tlink_tcon(cifsFile->tlink);
Steve French38702532007-07-08 15:40:40 +0000788 rc = find_cifs_entry(xid, pTcon, file,
789 &current_entry, &num_to_fill);
Steve French790fe572007-07-07 19:25:05 +0000790 if (rc) {
Joe Perchesb6b38f72010-04-21 03:50:45 +0000791 cFYI(1, "fce error %d", rc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700792 goto rddir2_exit;
793 } else if (current_entry != NULL) {
Joe Perchesb6b38f72010-04-21 03:50:45 +0000794 cFYI(1, "entry %lld found", file->f_pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795 } else {
Joe Perchesb6b38f72010-04-21 03:50:45 +0000796 cFYI(1, "could not find entry");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700797 goto rddir2_exit;
798 }
Joe Perchesb6b38f72010-04-21 03:50:45 +0000799 cFYI(1, "loop through %d times filling dir for net buf %p",
800 num_to_fill, cifsFile->srch_inf.ntwrk_buf_start);
Steve French5bafd762006-06-07 00:18:43 +0000801 max_len = smbCalcSize((struct smb_hdr *)
802 cifsFile->srch_inf.ntwrk_buf_start);
803 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len;
804
Jeff Laytonf5884162009-04-30 07:18:00 -0400805 tmp_buf = kmalloc(UNICODE_NAME_MAX, GFP_KERNEL);
Kulikov Vasiliyf55fdcc2010-07-16 20:15:25 +0400806 if (tmp_buf == NULL) {
807 rc = -ENOMEM;
808 break;
809 }
810
Steve French790fe572007-07-07 19:25:05 +0000811 for (i = 0; (i < num_to_fill) && (rc == 0); i++) {
812 if (current_entry == NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813 /* evaluate whether this case is an error */
Joe Perchesb6b38f72010-04-21 03:50:45 +0000814 cERROR(1, "past SMB end, num to fill %d i %d",
815 num_to_fill, i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700816 break;
817 }
Steve French60808232006-04-22 15:53:05 +0000818 /* if buggy server returns . and .. late do
819 we want to check for that here? */
Steve French5bafd762006-06-07 00:18:43 +0000820 rc = cifs_filldir(current_entry, file,
821 filldir, direntry, tmp_buf, max_len);
Steve French790fe572007-07-07 19:25:05 +0000822 if (rc == -EOVERFLOW) {
Steve French7ca85ba2006-10-30 21:42:57 +0000823 rc = 0;
824 break;
825 }
826
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827 file->f_pos++;
Steve French790fe572007-07-07 19:25:05 +0000828 if (file->f_pos ==
Steve French39798772006-05-31 22:40:51 +0000829 cifsFile->srch_inf.index_of_last_entry) {
Joe Perchesb6b38f72010-04-21 03:50:45 +0000830 cFYI(1, "last entry in buf at pos %lld %s",
831 file->f_pos, tmp_buf);
Steve French790fe572007-07-07 19:25:05 +0000832 cifs_save_resume_key(current_entry, cifsFile);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700833 break;
Steve French790fe572007-07-07 19:25:05 +0000834 } else
835 current_entry =
Steve French5bafd762006-06-07 00:18:43 +0000836 nxt_dir_entry(current_entry, end_of_smb,
837 cifsFile->srch_inf.info_level);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838 }
839 kfree(tmp_buf);
840 break;
841 } /* end switch */
842
843rddir2_exit:
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400844 free_xid(xid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700845 return rc;
846}