blob: f9b5d3d6cf33461081f4945d61a5d604fe2ef468 [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
Shirish Pargaonkarc052e2b2012-09-28 12:21:14 -0500154void
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 Shilovsky92fc65a2012-09-18 16:20:32 -0700223static int
224initiate_cifs_search(const unsigned int xid, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225{
Shirish Pargaonkar2608bee2012-05-15 10:19:16 -0500226 __u16 search_flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 int rc = 0;
Jeff Layton7ffec372010-09-29 19:51:11 -0400228 char *full_path = NULL;
Steve French38702532007-07-08 15:40:40 +0000229 struct cifsFileInfo *cifsFile;
Jeff Layton7ffec372010-09-29 19:51:11 -0400230 struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
Jeff Layton59c55ba2010-11-12 06:30:29 -0500231 struct tcon_link *tlink = NULL;
Pavel Shilovsky29e20f92012-07-13 13:58:14 +0400232 struct cifs_tcon *tcon;
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700233 struct TCP_Server_Info *server;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234
Jeff Layton7ffec372010-09-29 19:51:11 -0400235 if (file->private_data == NULL) {
Jeff Layton59c55ba2010-11-12 06:30:29 -0500236 tlink = cifs_sb_tlink(cifs_sb);
237 if (IS_ERR(tlink))
238 return PTR_ERR(tlink);
239
240 cifsFile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
241 if (cifsFile == NULL) {
242 rc = -ENOMEM;
243 goto error_exit;
244 }
245 file->private_data = cifsFile;
246 cifsFile->tlink = cifs_get_tlink(tlink);
Pavel Shilovsky29e20f92012-07-13 13:58:14 +0400247 tcon = tlink_tcon(tlink);
Jeff Layton59c55ba2010-11-12 06:30:29 -0500248 } else {
249 cifsFile = file->private_data;
Pavel Shilovsky29e20f92012-07-13 13:58:14 +0400250 tcon = tlink_tcon(cifsFile->tlink);
Jeff Layton7ffec372010-09-29 19:51:11 -0400251 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700253 server = tcon->ses->server;
254
255 if (!server->ops->query_dir_first) {
256 rc = -ENOSYS;
257 goto error_exit;
258 }
259
Steve French4b18f2a2008-04-29 00:06:05 +0000260 cifsFile->invalidHandle = true;
261 cifsFile->srch_inf.endOfSearch = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262
Josef "Jeff" Sipeke6a00292006-12-08 02:36:48 -0800263 full_path = build_path_from_dentry(file->f_path.dentry);
Jeff Layton7ffec372010-09-29 19:51:11 -0400264 if (full_path == NULL) {
265 rc = -ENOMEM;
266 goto error_exit;
267 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268
Joe Perchesb6b38f72010-04-21 03:50:45 +0000269 cFYI(1, "Full path: %s start at: %lld", full_path, file->f_pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270
Steve French75cf6bd2005-04-28 22:41:04 -0700271ffirst_retry:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 /* test for Unix extensions */
Steve Frenchc18c8422007-07-18 23:21:09 +0000273 /* but now check for them on the share/mount not on the SMB session */
Pavel Shilovsky29e20f92012-07-13 13:58:14 +0400274 /* if (cap_unix(tcon->ses) { */
275 if (tcon->unix_ext)
Steve French5bafd762006-06-07 00:18:43 +0000276 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
Pavel Shilovsky29e20f92012-07-13 13:58:14 +0400277 else if ((tcon->ses->capabilities &
278 tcon->ses->server->vals->cap_nt_find) == 0) {
Steve French5bafd762006-06-07 00:18:43 +0000279 cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
281 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
282 } else /* not srvinos - BB fixme add check for backlevel? */ {
283 cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
284 }
285
Shirish Pargaonkar2608bee2012-05-15 10:19:16 -0500286 search_flags = CIFS_SEARCH_CLOSE_AT_END | CIFS_SEARCH_RETURN_RESUME;
287 if (backup_cred(cifs_sb))
288 search_flags |= CIFS_SEARCH_BACKUP_SEARCH;
289
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700290 rc = server->ops->query_dir_first(xid, tcon, full_path, cifs_sb,
291 &cifsFile->fid, search_flags,
292 &cifsFile->srch_inf);
293
Steve French4523cc32007-04-30 20:13:06 +0000294 if (rc == 0)
Steve French4b18f2a2008-04-29 00:06:05 +0000295 cifsFile->invalidHandle = false;
Steve Frenche836f012009-05-01 16:20:35 +0000296 /* BB add following call to handle readdir on new NTFS symlink errors
Steve French0e0d2cf2009-05-01 05:27:32 +0000297 else if STATUS_STOPPED_ON_SYMLINK
298 call get_symlink_reparse_path and retry with new path */
299 else if ((rc == -EOPNOTSUPP) &&
Steve French75cf6bd2005-04-28 22:41:04 -0700300 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
301 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
302 goto ffirst_retry;
303 }
Jeff Layton7ffec372010-09-29 19:51:11 -0400304error_exit:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305 kfree(full_path);
Jeff Layton7ffec372010-09-29 19:51:11 -0400306 cifs_put_tlink(tlink);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 return rc;
308}
309
310/* return length of unicode string in bytes */
Christoph Hellwigcda0ec62011-07-16 15:24:05 -0400311static int cifs_unicode_bytelen(const char *str)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312{
313 int len;
Christoph Hellwigcda0ec62011-07-16 15:24:05 -0400314 const __le16 *ustr = (const __le16 *)str;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315
Steve French38702532007-07-08 15:40:40 +0000316 for (len = 0; len <= PATH_MAX; len++) {
Steve French4523cc32007-04-30 20:13:06 +0000317 if (ustr[len] == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318 return len << 1;
319 }
Joe Perchesb6b38f72010-04-21 03:50:45 +0000320 cFYI(1, "Unicode string longer than PATH_MAX found");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321 return len << 1;
322}
323
Steve French5bafd762006-06-07 00:18:43 +0000324static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325{
Steve French38702532007-07-08 15:40:40 +0000326 char *new_entry;
Steve Frenchad7a2922008-02-07 23:25:02 +0000327 FILE_DIRECTORY_INFO *pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328
Steve French4523cc32007-04-30 20:13:06 +0000329 if (level == SMB_FIND_FILE_INFO_STANDARD) {
Steve Frenchad7a2922008-02-07 23:25:02 +0000330 FIND_FILE_STANDARD_INFO *pfData;
Steve French5bafd762006-06-07 00:18:43 +0000331 pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo;
332
333 new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) +
334 pfData->FileNameLength;
335 } else
336 new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
Joe Perchesb6b38f72010-04-21 03:50:45 +0000337 cFYI(1, "new entry %p old entry %p", new_entry, old_entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338 /* validate that new_entry is not past end of SMB */
Steve French4523cc32007-04-30 20:13:06 +0000339 if (new_entry >= end_of_smb) {
Joe Perchesb6b38f72010-04-21 03:50:45 +0000340 cERROR(1, "search entry %p began after end of SMB %p old entry %p",
341 new_entry, end_of_smb, old_entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342 return NULL;
Steve French4523cc32007-04-30 20:13:06 +0000343 } else if (((level == SMB_FIND_FILE_INFO_STANDARD) &&
Steve French38702532007-07-08 15:40:40 +0000344 (new_entry + sizeof(FIND_FILE_STANDARD_INFO) > end_of_smb))
345 || ((level != SMB_FIND_FILE_INFO_STANDARD) &&
Steve French5bafd762006-06-07 00:18:43 +0000346 (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb))) {
Joe Perchesb6b38f72010-04-21 03:50:45 +0000347 cERROR(1, "search entry %p extends after end of SMB %p",
348 new_entry, end_of_smb);
Steve French09d1db52005-04-28 22:41:08 -0700349 return NULL;
Steve French38702532007-07-08 15:40:40 +0000350 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 return new_entry;
352
353}
354
Christoph Hellwigcda0ec62011-07-16 15:24:05 -0400355struct cifs_dirent {
356 const char *name;
357 size_t namelen;
358 u32 resume_key;
359 u64 ino;
360};
361
362static void cifs_fill_dirent_unix(struct cifs_dirent *de,
363 const FILE_UNIX_INFO *info, bool is_unicode)
364{
365 de->name = &info->FileName[0];
366 if (is_unicode)
367 de->namelen = cifs_unicode_bytelen(de->name);
368 else
369 de->namelen = strnlen(de->name, PATH_MAX);
370 de->resume_key = info->ResumeKey;
371 de->ino = le64_to_cpu(info->basic.UniqueId);
372}
373
374static void cifs_fill_dirent_dir(struct cifs_dirent *de,
375 const FILE_DIRECTORY_INFO *info)
376{
377 de->name = &info->FileName[0];
378 de->namelen = le32_to_cpu(info->FileNameLength);
379 de->resume_key = info->FileIndex;
380}
381
382static void cifs_fill_dirent_full(struct cifs_dirent *de,
383 const FILE_FULL_DIRECTORY_INFO *info)
384{
385 de->name = &info->FileName[0];
386 de->namelen = le32_to_cpu(info->FileNameLength);
387 de->resume_key = info->FileIndex;
388}
389
390static void cifs_fill_dirent_search(struct cifs_dirent *de,
391 const SEARCH_ID_FULL_DIR_INFO *info)
392{
393 de->name = &info->FileName[0];
394 de->namelen = le32_to_cpu(info->FileNameLength);
395 de->resume_key = info->FileIndex;
396 de->ino = le64_to_cpu(info->UniqueId);
397}
398
399static void cifs_fill_dirent_both(struct cifs_dirent *de,
400 const FILE_BOTH_DIRECTORY_INFO *info)
401{
402 de->name = &info->FileName[0];
403 de->namelen = le32_to_cpu(info->FileNameLength);
404 de->resume_key = info->FileIndex;
405}
406
407static void cifs_fill_dirent_std(struct cifs_dirent *de,
408 const FIND_FILE_STANDARD_INFO *info)
409{
410 de->name = &info->FileName[0];
411 /* one byte length, no endianess conversion */
412 de->namelen = info->FileNameLength;
413 de->resume_key = info->ResumeKey;
414}
415
416static int cifs_fill_dirent(struct cifs_dirent *de, const void *info,
417 u16 level, bool is_unicode)
418{
419 memset(de, 0, sizeof(*de));
420
421 switch (level) {
422 case SMB_FIND_FILE_UNIX:
423 cifs_fill_dirent_unix(de, info, is_unicode);
424 break;
425 case SMB_FIND_FILE_DIRECTORY_INFO:
426 cifs_fill_dirent_dir(de, info);
427 break;
428 case SMB_FIND_FILE_FULL_DIRECTORY_INFO:
429 cifs_fill_dirent_full(de, info);
430 break;
431 case SMB_FIND_FILE_ID_FULL_DIR_INFO:
432 cifs_fill_dirent_search(de, info);
433 break;
434 case SMB_FIND_FILE_BOTH_DIRECTORY_INFO:
435 cifs_fill_dirent_both(de, info);
436 break;
437 case SMB_FIND_FILE_INFO_STANDARD:
438 cifs_fill_dirent_std(de, info);
439 break;
440 default:
441 cFYI(1, "Unknown findfirst level %d", level);
442 return -EINVAL;
443 }
444
445 return 0;
446}
447
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448#define UNICODE_DOT cpu_to_le16(0x2e)
449
450/* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
Christoph Hellwigcda0ec62011-07-16 15:24:05 -0400451static int cifs_entry_is_dot(struct cifs_dirent *de, bool is_unicode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452{
453 int rc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454
Christoph Hellwigcda0ec62011-07-16 15:24:05 -0400455 if (!de->name)
456 return 0;
457
458 if (is_unicode) {
459 __le16 *ufilename = (__le16 *)de->name;
460 if (de->namelen == 2) {
461 /* check for . */
462 if (ufilename[0] == UNICODE_DOT)
463 rc = 1;
464 } else if (de->namelen == 4) {
465 /* check for .. */
466 if (ufilename[0] == UNICODE_DOT &&
467 ufilename[1] == UNICODE_DOT)
468 rc = 2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469 }
Christoph Hellwigcda0ec62011-07-16 15:24:05 -0400470 } else /* ASCII */ {
471 if (de->namelen == 1) {
472 if (de->name[0] == '.')
473 rc = 1;
474 } else if (de->namelen == 2) {
475 if (de->name[0] == '.' && de->name[1] == '.')
476 rc = 2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 }
478 }
479
480 return rc;
481}
482
Steve Frencheafe8702005-09-15 21:47:30 -0700483/* Check if directory that we are searching has changed so we can decide
484 whether we can use the cached search results from the previous search */
Steve French38702532007-07-08 15:40:40 +0000485static int is_dir_changed(struct file *file)
Steve Frencheafe8702005-09-15 21:47:30 -0700486{
Christoph Hellwigc33f8d32007-04-02 18:47:20 +0000487 struct inode *inode = file->f_path.dentry->d_inode;
488 struct cifsInodeInfo *cifsInfo = CIFS_I(inode);
Steve Frencheafe8702005-09-15 21:47:30 -0700489
Christoph Hellwigc33f8d32007-04-02 18:47:20 +0000490 if (cifsInfo->time == 0)
Steve Frencheafe8702005-09-15 21:47:30 -0700491 return 1; /* directory was changed, perhaps due to unlink */
492 else
493 return 0;
494
495}
496
Steve French0752f152008-10-07 20:03:33 +0000497static int cifs_save_resume_key(const char *current_entry,
Christoph Hellwigeaf35b12011-07-16 15:24:37 -0400498 struct cifsFileInfo *file_info)
Steve French0752f152008-10-07 20:03:33 +0000499{
Christoph Hellwigeaf35b12011-07-16 15:24:37 -0400500 struct cifs_dirent de;
501 int rc;
Steve French0752f152008-10-07 20:03:33 +0000502
Christoph Hellwigeaf35b12011-07-16 15:24:37 -0400503 rc = cifs_fill_dirent(&de, current_entry, file_info->srch_inf.info_level,
504 file_info->srch_inf.unicode);
505 if (!rc) {
506 file_info->srch_inf.presume_name = de.name;
507 file_info->srch_inf.resume_name_len = de.namelen;
508 file_info->srch_inf.resume_key = de.resume_key;
Steve French0752f152008-10-07 20:03:33 +0000509 }
Steve French0752f152008-10-07 20:03:33 +0000510 return rc;
511}
512
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700513/*
514 * Find the corresponding entry in the search. Note that the SMB server returns
515 * search entries for . and .. which complicates logic here if we choose to
516 * parse for them and we do not assume that they are located in the findfirst
517 * return buffer. We start counting in the buffer with entry 2 and increment for
518 * every entry (do not increment for . or .. entry).
519 */
520static int
521find_cifs_entry(const unsigned int xid, struct cifs_tcon *tcon,
522 struct file *file, char **current_entry, int *num_to_ret)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523{
Shirish Pargaonkar2608bee2012-05-15 10:19:16 -0500524 __u16 search_flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525 int rc = 0;
526 int pos_in_buf = 0;
527 loff_t first_entry_in_buffer;
528 loff_t index_to_find = file->f_pos;
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700529 struct cifsFileInfo *cfile = file->private_data;
Shirish Pargaonkar2608bee2012-05-15 10:19:16 -0500530 struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700531 struct TCP_Server_Info *server = tcon->ses->server;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 /* check if index in the buffer */
Steve French50c2f752007-07-13 00:33:32 +0000533
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700534 if (!server->ops->query_dir_first || !server->ops->query_dir_next)
535 return -ENOSYS;
536
537 if ((cfile == NULL) || (current_entry == NULL) || (num_to_ret == NULL))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538 return -ENOENT;
Steve French50c2f752007-07-13 00:33:32 +0000539
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700540 *current_entry = NULL;
541 first_entry_in_buffer = cfile->srch_inf.index_of_last_entry -
542 cfile->srch_inf.entries_in_buffer;
Steve French60808232006-04-22 15:53:05 +0000543
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700544 /*
545 * If first entry in buf is zero then is first buffer
546 * in search response data which means it is likely . and ..
547 * will be in this buffer, although some servers do not return
548 * . and .. for the root of a drive and for those we need
549 * to start two entries earlier.
550 */
Steve French60808232006-04-22 15:53:05 +0000551
Steve French39798772006-05-31 22:40:51 +0000552 dump_cifs_file_struct(file, "In fce ");
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700553 if (((index_to_find < cfile->srch_inf.index_of_last_entry) &&
554 is_dir_changed(file)) || (index_to_find < first_entry_in_buffer)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555 /* close and restart search */
Joe Perchesb6b38f72010-04-21 03:50:45 +0000556 cFYI(1, "search backing up - close and restart search");
Jeff Layton44772882010-10-15 15:34:03 -0400557 spin_lock(&cifs_file_list_lock);
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700558 if (!cfile->srch_inf.endOfSearch && !cfile->invalidHandle) {
559 cfile->invalidHandle = true;
Jeff Layton44772882010-10-15 15:34:03 -0400560 spin_unlock(&cifs_file_list_lock);
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700561 if (server->ops->close)
562 server->ops->close(xid, tcon, &cfile->fid);
Steve Frenchddb4cbf2008-11-20 20:00:44 +0000563 } else
Jeff Layton44772882010-10-15 15:34:03 -0400564 spin_unlock(&cifs_file_list_lock);
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700565 if (cfile->srch_inf.ntwrk_buf_start) {
Joe Perchesb6b38f72010-04-21 03:50:45 +0000566 cFYI(1, "freeing SMB ff cache buf on search rewind");
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700567 if (cfile->srch_inf.smallBuf)
568 cifs_small_buf_release(cfile->srch_inf.
Steve Frenchd47d7c12006-02-28 03:45:48 +0000569 ntwrk_buf_start);
570 else
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700571 cifs_buf_release(cfile->srch_inf.
Steve Frenchd47d7c12006-02-28 03:45:48 +0000572 ntwrk_buf_start);
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700573 cfile->srch_inf.ntwrk_buf_start = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574 }
Steve French38702532007-07-08 15:40:40 +0000575 rc = initiate_cifs_search(xid, file);
Steve French4523cc32007-04-30 20:13:06 +0000576 if (rc) {
Joe Perchesb6b38f72010-04-21 03:50:45 +0000577 cFYI(1, "error %d reinitiating a search on rewind",
578 rc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579 return rc;
580 }
Jeff Layton70236762011-12-01 20:23:34 -0500581 /* FindFirst/Next set last_entry to NULL on malformed reply */
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700582 if (cfile->srch_inf.last_entry)
583 cifs_save_resume_key(cfile->srch_inf.last_entry, cfile);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584 }
585
Shirish Pargaonkar2608bee2012-05-15 10:19:16 -0500586 search_flags = CIFS_SEARCH_CLOSE_AT_END | CIFS_SEARCH_RETURN_RESUME;
587 if (backup_cred(cifs_sb))
588 search_flags |= CIFS_SEARCH_BACKUP_SEARCH;
589
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700590 while ((index_to_find >= cfile->srch_inf.index_of_last_entry) &&
591 (rc == 0) && !cfile->srch_inf.endOfSearch) {
Joe Perchesb6b38f72010-04-21 03:50:45 +0000592 cFYI(1, "calling findnext2");
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700593 rc = server->ops->query_dir_next(xid, tcon, &cfile->fid,
594 search_flags,
595 &cfile->srch_inf);
Jeff Layton70236762011-12-01 20:23:34 -0500596 /* FindFirst/Next set last_entry to NULL on malformed reply */
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700597 if (cfile->srch_inf.last_entry)
598 cifs_save_resume_key(cfile->srch_inf.last_entry, cfile);
Steve French4523cc32007-04-30 20:13:06 +0000599 if (rc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600 return -ENOENT;
601 }
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700602 if (index_to_find < cfile->srch_inf.index_of_last_entry) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603 /* we found the buffer that contains the entry */
604 /* scan and find it */
605 int i;
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700606 char *cur_ent;
607 char *end_of_smb = cfile->srch_inf.ntwrk_buf_start +
608 server->ops->calc_smb_size(
609 cfile->srch_inf.ntwrk_buf_start);
Steve French60808232006-04-22 15:53:05 +0000610
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700611 cur_ent = cfile->srch_inf.srch_entries_start;
612 first_entry_in_buffer = cfile->srch_inf.index_of_last_entry
613 - cfile->srch_inf.entries_in_buffer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614 pos_in_buf = index_to_find - first_entry_in_buffer;
Joe Perchesb6b38f72010-04-21 03:50:45 +0000615 cFYI(1, "found entry - pos_in_buf %d", pos_in_buf);
Steve French5bafd762006-06-07 00:18:43 +0000616
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700617 for (i = 0; (i < (pos_in_buf)) && (cur_ent != NULL); i++) {
Steve Frenchdfb75332005-06-22 17:13:47 -0700618 /* go entry by entry figuring out which is first */
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700619 cur_ent = nxt_dir_entry(cur_ent, end_of_smb,
620 cfile->srch_inf.info_level);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621 }
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700622 if ((cur_ent == NULL) && (i < pos_in_buf)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623 /* BB fixme - check if we should flag this error */
Joe Perchesb6b38f72010-04-21 03:50:45 +0000624 cERROR(1, "reached end of buf searching for pos in buf"
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700625 " %d index to find %lld rc %d", pos_in_buf,
626 index_to_find, rc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627 }
628 rc = 0;
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700629 *current_entry = cur_ent;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630 } else {
Joe Perchesb6b38f72010-04-21 03:50:45 +0000631 cFYI(1, "index not in buffer - could not findnext into it");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632 return 0;
633 }
634
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700635 if (pos_in_buf >= cfile->srch_inf.entries_in_buffer) {
Joe Perchesb6b38f72010-04-21 03:50:45 +0000636 cFYI(1, "can not return entries pos_in_buf beyond last");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637 *num_to_ret = 0;
638 } else
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700639 *num_to_ret = cfile->srch_inf.entries_in_buffer - pos_in_buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640
641 return rc;
642}
643
Christoph Hellwig9feed6f2011-07-16 15:23:49 -0400644static int cifs_filldir(char *find_entry, struct file *file, filldir_t filldir,
645 void *dirent, char *scratch_buf, unsigned int max_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646{
Christoph Hellwig9feed6f2011-07-16 15:23:49 -0400647 struct cifsFileInfo *file_info = file->private_data;
648 struct super_block *sb = file->f_path.dentry->d_sb;
649 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
Christoph Hellwigcda0ec62011-07-16 15:24:05 -0400650 struct cifs_dirent de = { NULL, };
Jeff Laytoncc0bad72009-06-25 00:56:52 -0400651 struct cifs_fattr fattr;
Christoph Hellwig9feed6f2011-07-16 15:23:49 -0400652 struct dentry *dentry;
653 struct qstr name;
654 int rc = 0;
Christoph Hellwig9feed6f2011-07-16 15:23:49 -0400655 ino_t ino;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656
Christoph Hellwigcda0ec62011-07-16 15:24:05 -0400657 rc = cifs_fill_dirent(&de, find_entry, file_info->srch_inf.info_level,
658 file_info->srch_inf.unicode);
Steve French790fe572007-07-07 19:25:05 +0000659 if (rc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660 return rc;
661
Christoph Hellwigf16d59b2011-07-16 15:24:22 -0400662 if (de.namelen > max_len) {
663 cERROR(1, "bad search response length %zd past smb end",
664 de.namelen);
665 return -EINVAL;
666 }
Jeff Layton132ac7b2009-02-10 07:33:57 -0500667
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668 /* skip . and .. since we added them first */
Christoph Hellwigcda0ec62011-07-16 15:24:05 -0400669 if (cifs_entry_is_dot(&de, file_info->srch_inf.unicode))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700670 return 0;
671
Christoph Hellwigf16d59b2011-07-16 15:24:22 -0400672 if (file_info->srch_inf.unicode) {
673 struct nls_table *nlt = cifs_sb->local_nls;
674
675 name.name = scratch_buf;
676 name.len =
Steve Frenchacbbb762012-01-18 22:32:33 -0600677 cifs_from_utf16((char *)name.name, (__le16 *)de.name,
678 UNICODE_NAME_MAX,
679 min_t(size_t, de.namelen,
680 (size_t)max_len), nlt,
681 cifs_sb->mnt_cifs_flags &
Christoph Hellwigf16d59b2011-07-16 15:24:22 -0400682 CIFS_MOUNT_MAP_SPECIAL_CHR);
683 name.len -= nls_nullsize(nlt);
684 } else {
685 name.name = de.name;
686 name.len = de.namelen;
687 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688
Christoph Hellwig9feed6f2011-07-16 15:23:49 -0400689 switch (file_info->srch_inf.info_level) {
690 case SMB_FIND_FILE_UNIX:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691 cifs_unix_basic_to_fattr(&fattr,
Christoph Hellwig9feed6f2011-07-16 15:23:49 -0400692 &((FILE_UNIX_INFO *)find_entry)->basic,
693 cifs_sb);
694 break;
695 case SMB_FIND_FILE_INFO_STANDARD:
696 cifs_std_info_to_fattr(&fattr,
697 (FIND_FILE_STANDARD_INFO *)find_entry,
698 cifs_sb);
699 break;
700 default:
701 cifs_dir_info_to_fattr(&fattr,
702 (FILE_DIRECTORY_INFO *)find_entry,
703 cifs_sb);
704 break;
705 }
Steve French38702532007-07-08 15:40:40 +0000706
Christoph Hellwigf16d59b2011-07-16 15:24:22 -0400707 if (de.ino && (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
708 fattr.cf_uniqueid = de.ino;
Jeff Laytonec06aed2009-11-06 14:18:29 -0500709 } else {
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400710 fattr.cf_uniqueid = iunique(sb, ROOT_I);
Jeff Laytonec06aed2009-11-06 14:18:29 -0500711 cifs_autodisable_serverino(cifs_sb);
712 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713
Stefan Metzmacher1b12b9c2010-08-05 21:19:56 +0200714 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) &&
715 CIFSCouldBeMFSymlink(&fattr))
716 /*
717 * trying to get the type and mode can be slow,
718 * so just call those regular files for now, and mark
719 * for reval
720 */
721 fattr.cf_flags |= CIFS_FATTR_NEED_REVAL;
722
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400723 ino = cifs_uniqueid_to_ino_t(fattr.cf_uniqueid);
Christoph Hellwig9feed6f2011-07-16 15:23:49 -0400724 dentry = cifs_readdir_lookup(file->f_dentry, &name, &fattr);
Steve French50c2f752007-07-13 00:33:32 +0000725
Christoph Hellwig9feed6f2011-07-16 15:23:49 -0400726 rc = filldir(dirent, name.name, name.len, file->f_pos, ino,
727 fattr.cf_dtype);
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400728
Christoph Hellwig9feed6f2011-07-16 15:23:49 -0400729 dput(dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730 return rc;
731}
732
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733
734int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
735{
736 int rc = 0;
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400737 unsigned int xid;
738 int i;
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700739 struct cifs_tcon *tcon;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740 struct cifsFileInfo *cifsFile = NULL;
Steve French38702532007-07-08 15:40:40 +0000741 char *current_entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742 int num_to_fill = 0;
Steve French38702532007-07-08 15:40:40 +0000743 char *tmp_buf = NULL;
Steve French50c2f752007-07-13 00:33:32 +0000744 char *end_of_smb;
Jeff Layton18295792009-04-30 20:45:45 -0400745 unsigned int max_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400747 xid = get_xid();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700748
Suresh Jayaraman6221ddd2010-10-01 21:23:33 +0530749 /*
750 * Ensure FindFirst doesn't fail before doing filldir() for '.' and
751 * '..'. Otherwise we won't be able to notify VFS in case of failure.
752 */
753 if (file->private_data == NULL) {
754 rc = initiate_cifs_search(xid, file);
755 cFYI(1, "initiate cifs search rc %d", rc);
756 if (rc)
757 goto rddir2_exit;
758 }
759
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760 switch ((int) file->f_pos) {
761 case 0:
Steve French60808232006-04-22 15:53:05 +0000762 if (filldir(direntry, ".", 1, file->f_pos,
Josef "Jeff" Sipeke6a00292006-12-08 02:36:48 -0800763 file->f_path.dentry->d_inode->i_ino, DT_DIR) < 0) {
Joe Perchesb6b38f72010-04-21 03:50:45 +0000764 cERROR(1, "Filldir for current dir failed");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765 rc = -ENOMEM;
766 break;
767 }
Steve French60808232006-04-22 15:53:05 +0000768 file->f_pos++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769 case 1:
Steve French60808232006-04-22 15:53:05 +0000770 if (filldir(direntry, "..", 2, file->f_pos,
Al Virob85fd6b2011-07-17 11:19:44 -0400771 parent_ino(file->f_path.dentry), DT_DIR) < 0) {
Joe Perchesb6b38f72010-04-21 03:50:45 +0000772 cERROR(1, "Filldir for parent dir failed");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773 rc = -ENOMEM;
774 break;
775 }
Steve French60808232006-04-22 15:53:05 +0000776 file->f_pos++;
777 default:
Steve French38702532007-07-08 15:40:40 +0000778 /* 1) If search is active,
779 is in current search buffer?
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780 if it before then restart search
781 if after then keep searching till find it */
782
Steve French790fe572007-07-07 19:25:05 +0000783 if (file->private_data == NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784 rc = -EINVAL;
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400785 free_xid(xid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786 return rc;
787 }
788 cifsFile = file->private_data;
789 if (cifsFile->srch_inf.endOfSearch) {
Steve French790fe572007-07-07 19:25:05 +0000790 if (cifsFile->srch_inf.emptyDir) {
Joe Perchesb6b38f72010-04-21 03:50:45 +0000791 cFYI(1, "End of search, empty dir");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700792 rc = 0;
793 break;
794 }
795 } /* else {
Steve French4b18f2a2008-04-29 00:06:05 +0000796 cifsFile->invalidHandle = true;
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700797 tcon->ses->server->close(xid, tcon, &cifsFile->fid);
Steve Frenchaaa9bbe2008-05-23 17:38:32 +0000798 } */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700799
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700800 tcon = tlink_tcon(cifsFile->tlink);
801 rc = find_cifs_entry(xid, tcon, file, &current_entry,
802 &num_to_fill);
Steve French790fe572007-07-07 19:25:05 +0000803 if (rc) {
Joe Perchesb6b38f72010-04-21 03:50:45 +0000804 cFYI(1, "fce error %d", rc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805 goto rddir2_exit;
806 } else if (current_entry != NULL) {
Joe Perchesb6b38f72010-04-21 03:50:45 +0000807 cFYI(1, "entry %lld found", file->f_pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808 } else {
Joe Perchesb6b38f72010-04-21 03:50:45 +0000809 cFYI(1, "could not find entry");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810 goto rddir2_exit;
811 }
Joe Perchesb6b38f72010-04-21 03:50:45 +0000812 cFYI(1, "loop through %d times filling dir for net buf %p",
813 num_to_fill, cifsFile->srch_inf.ntwrk_buf_start);
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700814 max_len = tcon->ses->server->ops->calc_smb_size(
Steve French5bafd762006-06-07 00:18:43 +0000815 cifsFile->srch_inf.ntwrk_buf_start);
816 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len;
817
Jeff Laytonf5884162009-04-30 07:18:00 -0400818 tmp_buf = kmalloc(UNICODE_NAME_MAX, GFP_KERNEL);
Kulikov Vasiliyf55fdcc2010-07-16 20:15:25 +0400819 if (tmp_buf == NULL) {
820 rc = -ENOMEM;
821 break;
822 }
823
Steve French790fe572007-07-07 19:25:05 +0000824 for (i = 0; (i < num_to_fill) && (rc == 0); i++) {
825 if (current_entry == NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700826 /* evaluate whether this case is an error */
Joe Perchesb6b38f72010-04-21 03:50:45 +0000827 cERROR(1, "past SMB end, num to fill %d i %d",
828 num_to_fill, i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700829 break;
830 }
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700831 /*
832 * if buggy server returns . and .. late do we want to
833 * check for that here?
834 */
835 rc = cifs_filldir(current_entry, file, filldir,
836 direntry, tmp_buf, max_len);
Steve French790fe572007-07-07 19:25:05 +0000837 if (rc == -EOVERFLOW) {
Steve French7ca85ba2006-10-30 21:42:57 +0000838 rc = 0;
839 break;
840 }
841
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842 file->f_pos++;
Steve French790fe572007-07-07 19:25:05 +0000843 if (file->f_pos ==
Steve French39798772006-05-31 22:40:51 +0000844 cifsFile->srch_inf.index_of_last_entry) {
Joe Perchesb6b38f72010-04-21 03:50:45 +0000845 cFYI(1, "last entry in buf at pos %lld %s",
846 file->f_pos, tmp_buf);
Steve French790fe572007-07-07 19:25:05 +0000847 cifs_save_resume_key(current_entry, cifsFile);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700848 break;
Steve French790fe572007-07-07 19:25:05 +0000849 } else
850 current_entry =
Steve French5bafd762006-06-07 00:18:43 +0000851 nxt_dir_entry(current_entry, end_of_smb,
852 cifsFile->srch_inf.info_level);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853 }
854 kfree(tmp_buf);
855 break;
856 } /* end switch */
857
858rddir2_exit:
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400859 free_xid(xid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860 return rc;
861}