blob: 53a75f3d0179231d395611f61f2897c9a52f33de [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 Perchesf96637b2013-05-04 22:12:25 -050051 cifs_dbg(FYI, "empty cifs private file data\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -070052 return;
53 }
Steve Frenchad7a2922008-02-07 23:25:02 +000054 if (cf->invalidHandle)
Joe Perchesf96637b2013-05-04 22:12:25 -050055 cifs_dbg(FYI, "invalid handle\n");
Steve Frenchad7a2922008-02-07 23:25:02 +000056 if (cf->srch_inf.endOfSearch)
Joe Perchesf96637b2013-05-04 22:12:25 -050057 cifs_dbg(FYI, "end of search\n");
Steve Frenchad7a2922008-02-07 23:25:02 +000058 if (cf->srch_inf.emptyDir)
Joe Perchesf96637b2013-05-04 22:12:25 -050059 cifs_dbg(FYI, "empty dir\n");
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/*
Jeff Laytoneb1b3fa2012-12-03 06:05:37 -050069 * Attempt to preload the dcache with the results from the FIND_FIRST/NEXT
70 *
Jeff Laytoncc0bad72009-06-25 00:56:52 -040071 * 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.
73 */
Jeff Laytoneb1b3fa2012-12-03 06:05:37 -050074static void
75cifs_prime_dcache(struct dentry *parent, struct qstr *name,
Jeff Laytoncc0bad72009-06-25 00:56:52 -040076 struct cifs_fattr *fattr)
77{
78 struct dentry *dentry, *alias;
79 struct inode *inode;
80 struct super_block *sb = parent->d_inode->i_sb;
Jeff Layton2f2591a2012-12-18 06:35:10 -050081 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
Jeff Laytoncc0bad72009-06-25 00:56:52 -040082
Joe Perchesf96637b2013-05-04 22:12:25 -050083 cifs_dbg(FYI, "%s: for %s\n", __func__, name->name);
Jeff Laytoncc0bad72009-06-25 00:56:52 -040084
Al Viro4f522a22013-02-11 23:20:37 -050085 dentry = d_hash_and_lookup(parent, name);
86 if (unlikely(IS_ERR(dentry)))
87 return;
Jeff Layton05507fa2010-02-05 13:30:36 -050088
Jeff Laytoncc0bad72009-06-25 00:56:52 -040089 if (dentry) {
Al Viro0903a0c2012-11-29 22:11:06 -050090 int err;
Jeff Laytoneb1b3fa2012-12-03 06:05:37 -050091
Jeff Laytoncd600422012-07-06 07:09:42 -040092 inode = dentry->d_inode;
Jeff Layton2f2591a2012-12-18 06:35:10 -050093 if (inode) {
94 /*
95 * If we're generating inode numbers, then we don't
96 * want to clobber the existing one with the one that
97 * the readdir code created.
98 */
99 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM))
100 fattr->cf_uniqueid = CIFS_I(inode)->uniqueid;
101
102 /* update inode in place if i_ino didn't change */
103 if (CIFS_I(inode)->uniqueid == fattr->cf_uniqueid) {
104 cifs_fattr_to_inode(inode, fattr);
105 goto out;
106 }
Jeff Laytoncd600422012-07-06 07:09:42 -0400107 }
Al Viro0903a0c2012-11-29 22:11:06 -0500108 err = d_invalidate(dentry);
Jeff Laytoncc0bad72009-06-25 00:56:52 -0400109 dput(dentry);
Al Viro0903a0c2012-11-29 22:11:06 -0500110 if (err)
Jeff Laytoneb1b3fa2012-12-03 06:05:37 -0500111 return;
Jeff Laytoncc0bad72009-06-25 00:56:52 -0400112 }
113
Jeff Layton757c4f62013-08-07 10:29:08 -0400114 /*
115 * If we know that the inode will need to be revalidated immediately,
116 * then don't create a new dentry for it. We'll end up doing an on
117 * the wire call either way and this spares us an invalidation.
118 */
119 if (fattr->cf_flags & CIFS_FATTR_NEED_REVAL)
120 return;
121
Jeff Laytoncc0bad72009-06-25 00:56:52 -0400122 dentry = d_alloc(parent, name);
Jeff Laytoneb1b3fa2012-12-03 06:05:37 -0500123 if (!dentry)
124 return;
Jeff Laytoncc0bad72009-06-25 00:56:52 -0400125
126 inode = cifs_iget(sb, fattr);
Jeff Laytoneb1b3fa2012-12-03 06:05:37 -0500127 if (!inode)
128 goto out;
Jeff Laytoncc0bad72009-06-25 00:56:52 -0400129
Jeff Laytoncc0bad72009-06-25 00:56:52 -0400130 alias = d_materialise_unique(dentry, inode);
Jeff Laytoneb1b3fa2012-12-03 06:05:37 -0500131 if (alias && !IS_ERR(alias))
132 dput(alias);
133out:
134 dput(dentry);
Jeff Laytoncc0bad72009-06-25 00:56:52 -0400135}
136
Jeff Layton2a2c41c2013-06-25 01:32:17 -0500137/*
138 * Is it possible that this directory might turn out to be a DFS referral
139 * once we go to try and use it?
140 */
141static bool
142cifs_dfs_is_possible(struct cifs_sb_info *cifs_sb)
143{
144#ifdef CONFIG_CIFS_DFS_UPCALL
145 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
146
147 if (tcon->Flags & SMB_SHARE_IS_IN_DFS)
148 return true;
149#endif
150 return false;
151}
152
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400153static void
154cifs_fill_common_info(struct cifs_fattr *fattr, struct cifs_sb_info *cifs_sb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155{
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400156 fattr->cf_uid = cifs_sb->mnt_uid;
157 fattr->cf_gid = cifs_sb->mnt_gid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400159 if (fattr->cf_cifsattrs & ATTR_DIRECTORY) {
160 fattr->cf_mode = S_IFDIR | cifs_sb->mnt_dir_mode;
161 fattr->cf_dtype = DT_DIR;
Jeff Layton2a2c41c2013-06-25 01:32:17 -0500162 /*
163 * Windows CIFS servers generally make DFS referrals look
164 * like directories in FIND_* responses with the reparse
165 * attribute flag also set (since DFS junctions are
166 * reparse points). We must revalidate at least these
167 * directory inodes before trying to use them (if
168 * they are DFS we will get PATH_NOT_COVERED back
169 * when queried directly and can then try to connect
170 * to the DFS target)
171 */
172 if (cifs_dfs_is_possible(cifs_sb) &&
173 (fattr->cf_cifsattrs & ATTR_REPARSE))
174 fattr->cf_flags |= CIFS_FATTR_NEED_REVAL;
Pavel Shilovskyb42bf882013-08-14 19:25:21 +0400175 } else if (fattr->cf_cifsattrs & ATTR_REPARSE) {
176 fattr->cf_mode = S_IFLNK;
177 fattr->cf_dtype = DT_LNK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 } else {
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400179 fattr->cf_mode = S_IFREG | cifs_sb->mnt_file_mode;
180 fattr->cf_dtype = DT_REG;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 }
182
Jim McDonough74d290d2013-09-21 10:36:10 -0500183 /* non-unix readdir doesn't provide nlink */
184 fattr->cf_flags |= CIFS_FATTR_UNKNOWN_NLINK;
185
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400186 if (fattr->cf_cifsattrs & ATTR_READONLY)
187 fattr->cf_mode &= ~S_IWUGO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188
Jeff Laytonccb5c002012-11-25 08:00:40 -0500189 /*
190 * We of course don't get ACL info in FIND_FIRST/NEXT results, so
191 * mark it for revalidation so that "ls -l" will look right. It might
192 * be super-slow, but if we don't do this then the ownership of files
193 * may look wrong since the inodes may not have timed out by the time
194 * "ls" does a stat() call on them.
195 */
196 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
197 fattr->cf_flags |= CIFS_FATTR_NEED_REVAL;
198
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400199 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL &&
200 fattr->cf_cifsattrs & ATTR_SYSTEM) {
201 if (fattr->cf_eof == 0) {
202 fattr->cf_mode &= ~S_IFMT;
203 fattr->cf_mode |= S_IFIFO;
204 fattr->cf_dtype = DT_FIFO;
Steve French3020a1f2005-11-18 11:31:10 -0800205 } else {
Jeff Layton4468eb32008-05-22 09:31:40 -0400206 /*
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400207 * trying to get the type and mode via SFU can be slow,
208 * so just call those regular files for now, and mark
209 * for reval
Jeff Layton4468eb32008-05-22 09:31:40 -0400210 */
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400211 fattr->cf_flags |= CIFS_FATTR_NEED_REVAL;
Jeff Layton4468eb32008-05-22 09:31:40 -0400212 }
213 }
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400214}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215
Shirish Pargaonkarc052e2b2012-09-28 12:21:14 -0500216void
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400217cifs_dir_info_to_fattr(struct cifs_fattr *fattr, FILE_DIRECTORY_INFO *info,
218 struct cifs_sb_info *cifs_sb)
219{
220 memset(fattr, 0, sizeof(*fattr));
221 fattr->cf_cifsattrs = le32_to_cpu(info->ExtFileAttributes);
222 fattr->cf_eof = le64_to_cpu(info->EndOfFile);
223 fattr->cf_bytes = le64_to_cpu(info->AllocationSize);
Jeff Layton20054bd2011-01-07 11:30:27 -0500224 fattr->cf_createtime = le64_to_cpu(info->CreationTime);
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400225 fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
226 fattr->cf_ctime = cifs_NTtimeToUnix(info->ChangeTime);
227 fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400229 cifs_fill_common_info(fattr, cifs_sb);
230}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231
Steve French15dd4782009-09-25 02:24:45 +0000232static void
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400233cifs_std_info_to_fattr(struct cifs_fattr *fattr, FIND_FILE_STANDARD_INFO *info,
234 struct cifs_sb_info *cifs_sb)
235{
Jeff Layton0d424ad2010-09-20 16:01:35 -0700236 int offset = cifs_sb_master_tcon(cifs_sb)->ses->server->timeAdj;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400238 memset(fattr, 0, sizeof(*fattr));
239 fattr->cf_atime = cnvrtDosUnixTm(info->LastAccessDate,
240 info->LastAccessTime, offset);
241 fattr->cf_ctime = cnvrtDosUnixTm(info->LastWriteDate,
242 info->LastWriteTime, offset);
243 fattr->cf_mtime = cnvrtDosUnixTm(info->LastWriteDate,
244 info->LastWriteTime, offset);
Steve Frenchf3f6ec42006-01-08 20:12:58 -0800245
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400246 fattr->cf_cifsattrs = le16_to_cpu(info->Attributes);
247 fattr->cf_bytes = le32_to_cpu(info->AllocationSize);
248 fattr->cf_eof = le32_to_cpu(info->DataSize);
Dave Kleikamp273d81d2006-06-01 19:41:23 +0000249
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400250 cifs_fill_common_info(fattr, cifs_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251}
252
Steve French0e0d2cf2009-05-01 05:27:32 +0000253/* BB eventually need to add the following helper function to
254 resolve NT_STATUS_STOPPED_ON_SYMLINK return code when
255 we try to do FindFirst on (NTFS) directory symlinks */
256/*
257int get_symlink_reparse_path(char *full_path, struct cifs_sb_info *cifs_sb,
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400258 unsigned int xid)
Steve French0e0d2cf2009-05-01 05:27:32 +0000259{
260 __u16 fid;
261 int len;
262 int oplock = 0;
263 int rc;
Steve French96daf2b2011-05-27 04:34:02 +0000264 struct cifs_tcon *ptcon = cifs_sb_tcon(cifs_sb);
Steve French0e0d2cf2009-05-01 05:27:32 +0000265 char *tmpbuffer;
266
267 rc = CIFSSMBOpen(xid, ptcon, full_path, FILE_OPEN, GENERIC_READ,
268 OPEN_REPARSE_POINT, &fid, &oplock, NULL,
269 cifs_sb->local_nls,
270 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
271 if (!rc) {
272 tmpbuffer = kmalloc(maxpath);
273 rc = CIFSSMBQueryReparseLinkInfo(xid, ptcon, full_path,
274 tmpbuffer,
275 maxpath -1,
276 fid,
277 cifs_sb->local_nls);
278 if (CIFSSMBClose(xid, ptcon, fid)) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500279 cifs_dbg(FYI, "Error closing temporary reparsepoint open\n");
Steve French0e0d2cf2009-05-01 05:27:32 +0000280 }
281 }
282}
283 */
284
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700285static int
286initiate_cifs_search(const unsigned int xid, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287{
Shirish Pargaonkar2608bee2012-05-15 10:19:16 -0500288 __u16 search_flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 int rc = 0;
Jeff Layton7ffec372010-09-29 19:51:11 -0400290 char *full_path = NULL;
Steve French38702532007-07-08 15:40:40 +0000291 struct cifsFileInfo *cifsFile;
Jeff Layton7ffec372010-09-29 19:51:11 -0400292 struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
Jeff Layton59c55ba2010-11-12 06:30:29 -0500293 struct tcon_link *tlink = NULL;
Pavel Shilovsky29e20f92012-07-13 13:58:14 +0400294 struct cifs_tcon *tcon;
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700295 struct TCP_Server_Info *server;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296
Jeff Layton7ffec372010-09-29 19:51:11 -0400297 if (file->private_data == NULL) {
Jeff Layton59c55ba2010-11-12 06:30:29 -0500298 tlink = cifs_sb_tlink(cifs_sb);
299 if (IS_ERR(tlink))
300 return PTR_ERR(tlink);
301
302 cifsFile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
303 if (cifsFile == NULL) {
304 rc = -ENOMEM;
305 goto error_exit;
306 }
307 file->private_data = cifsFile;
308 cifsFile->tlink = cifs_get_tlink(tlink);
Pavel Shilovsky29e20f92012-07-13 13:58:14 +0400309 tcon = tlink_tcon(tlink);
Jeff Layton59c55ba2010-11-12 06:30:29 -0500310 } else {
311 cifsFile = file->private_data;
Pavel Shilovsky29e20f92012-07-13 13:58:14 +0400312 tcon = tlink_tcon(cifsFile->tlink);
Jeff Layton7ffec372010-09-29 19:51:11 -0400313 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700315 server = tcon->ses->server;
316
317 if (!server->ops->query_dir_first) {
318 rc = -ENOSYS;
319 goto error_exit;
320 }
321
Steve French4b18f2a2008-04-29 00:06:05 +0000322 cifsFile->invalidHandle = true;
323 cifsFile->srch_inf.endOfSearch = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324
Josef "Jeff" Sipeke6a00292006-12-08 02:36:48 -0800325 full_path = build_path_from_dentry(file->f_path.dentry);
Jeff Layton7ffec372010-09-29 19:51:11 -0400326 if (full_path == NULL) {
327 rc = -ENOMEM;
328 goto error_exit;
329 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330
Joe Perchesf96637b2013-05-04 22:12:25 -0500331 cifs_dbg(FYI, "Full path: %s start at: %lld\n", full_path, file->f_pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332
Steve French75cf6bd2005-04-28 22:41:04 -0700333ffirst_retry:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 /* test for Unix extensions */
Steve Frenchc18c8422007-07-18 23:21:09 +0000335 /* but now check for them on the share/mount not on the SMB session */
Pavel Shilovsky29e20f92012-07-13 13:58:14 +0400336 /* if (cap_unix(tcon->ses) { */
337 if (tcon->unix_ext)
Steve French5bafd762006-06-07 00:18:43 +0000338 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
Pavel Shilovsky29e20f92012-07-13 13:58:14 +0400339 else if ((tcon->ses->capabilities &
340 tcon->ses->server->vals->cap_nt_find) == 0) {
Steve French5bafd762006-06-07 00:18:43 +0000341 cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
343 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
344 } else /* not srvinos - BB fixme add check for backlevel? */ {
345 cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
346 }
347
Shirish Pargaonkar2608bee2012-05-15 10:19:16 -0500348 search_flags = CIFS_SEARCH_CLOSE_AT_END | CIFS_SEARCH_RETURN_RESUME;
349 if (backup_cred(cifs_sb))
350 search_flags |= CIFS_SEARCH_BACKUP_SEARCH;
351
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700352 rc = server->ops->query_dir_first(xid, tcon, full_path, cifs_sb,
353 &cifsFile->fid, search_flags,
354 &cifsFile->srch_inf);
355
Steve French4523cc32007-04-30 20:13:06 +0000356 if (rc == 0)
Steve French4b18f2a2008-04-29 00:06:05 +0000357 cifsFile->invalidHandle = false;
Steve Frenche836f012009-05-01 16:20:35 +0000358 /* BB add following call to handle readdir on new NTFS symlink errors
Steve French0e0d2cf2009-05-01 05:27:32 +0000359 else if STATUS_STOPPED_ON_SYMLINK
360 call get_symlink_reparse_path and retry with new path */
361 else if ((rc == -EOPNOTSUPP) &&
Steve French75cf6bd2005-04-28 22:41:04 -0700362 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
363 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
364 goto ffirst_retry;
365 }
Jeff Layton7ffec372010-09-29 19:51:11 -0400366error_exit:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367 kfree(full_path);
Jeff Layton7ffec372010-09-29 19:51:11 -0400368 cifs_put_tlink(tlink);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369 return rc;
370}
371
372/* return length of unicode string in bytes */
Christoph Hellwigcda0ec62011-07-16 15:24:05 -0400373static int cifs_unicode_bytelen(const char *str)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374{
375 int len;
Christoph Hellwigcda0ec62011-07-16 15:24:05 -0400376 const __le16 *ustr = (const __le16 *)str;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377
Steve French38702532007-07-08 15:40:40 +0000378 for (len = 0; len <= PATH_MAX; len++) {
Steve French4523cc32007-04-30 20:13:06 +0000379 if (ustr[len] == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380 return len << 1;
381 }
Joe Perchesf96637b2013-05-04 22:12:25 -0500382 cifs_dbg(FYI, "Unicode string longer than PATH_MAX found\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383 return len << 1;
384}
385
Steve French5bafd762006-06-07 00:18:43 +0000386static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387{
Steve French38702532007-07-08 15:40:40 +0000388 char *new_entry;
Steve Frenchad7a2922008-02-07 23:25:02 +0000389 FILE_DIRECTORY_INFO *pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390
Steve French4523cc32007-04-30 20:13:06 +0000391 if (level == SMB_FIND_FILE_INFO_STANDARD) {
Steve Frenchad7a2922008-02-07 23:25:02 +0000392 FIND_FILE_STANDARD_INFO *pfData;
Steve French5bafd762006-06-07 00:18:43 +0000393 pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo;
394
395 new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) +
396 pfData->FileNameLength;
397 } else
398 new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
Joe Perchesf96637b2013-05-04 22:12:25 -0500399 cifs_dbg(FYI, "new entry %p old entry %p\n", new_entry, old_entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 /* validate that new_entry is not past end of SMB */
Steve French4523cc32007-04-30 20:13:06 +0000401 if (new_entry >= end_of_smb) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500402 cifs_dbg(VFS, "search entry %p began after end of SMB %p old entry %p\n",
403 new_entry, end_of_smb, old_entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404 return NULL;
Steve French4523cc32007-04-30 20:13:06 +0000405 } else if (((level == SMB_FIND_FILE_INFO_STANDARD) &&
Steve French38702532007-07-08 15:40:40 +0000406 (new_entry + sizeof(FIND_FILE_STANDARD_INFO) > end_of_smb))
407 || ((level != SMB_FIND_FILE_INFO_STANDARD) &&
Steve French5bafd762006-06-07 00:18:43 +0000408 (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb))) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500409 cifs_dbg(VFS, "search entry %p extends after end of SMB %p\n",
410 new_entry, end_of_smb);
Steve French09d1db52005-04-28 22:41:08 -0700411 return NULL;
Steve French38702532007-07-08 15:40:40 +0000412 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413 return new_entry;
414
415}
416
Christoph Hellwigcda0ec62011-07-16 15:24:05 -0400417struct cifs_dirent {
418 const char *name;
419 size_t namelen;
420 u32 resume_key;
421 u64 ino;
422};
423
424static void cifs_fill_dirent_unix(struct cifs_dirent *de,
425 const FILE_UNIX_INFO *info, bool is_unicode)
426{
427 de->name = &info->FileName[0];
428 if (is_unicode)
429 de->namelen = cifs_unicode_bytelen(de->name);
430 else
431 de->namelen = strnlen(de->name, PATH_MAX);
432 de->resume_key = info->ResumeKey;
433 de->ino = le64_to_cpu(info->basic.UniqueId);
434}
435
436static void cifs_fill_dirent_dir(struct cifs_dirent *de,
437 const FILE_DIRECTORY_INFO *info)
438{
439 de->name = &info->FileName[0];
440 de->namelen = le32_to_cpu(info->FileNameLength);
441 de->resume_key = info->FileIndex;
442}
443
444static void cifs_fill_dirent_full(struct cifs_dirent *de,
445 const FILE_FULL_DIRECTORY_INFO *info)
446{
447 de->name = &info->FileName[0];
448 de->namelen = le32_to_cpu(info->FileNameLength);
449 de->resume_key = info->FileIndex;
450}
451
452static void cifs_fill_dirent_search(struct cifs_dirent *de,
453 const SEARCH_ID_FULL_DIR_INFO *info)
454{
455 de->name = &info->FileName[0];
456 de->namelen = le32_to_cpu(info->FileNameLength);
457 de->resume_key = info->FileIndex;
458 de->ino = le64_to_cpu(info->UniqueId);
459}
460
461static void cifs_fill_dirent_both(struct cifs_dirent *de,
462 const FILE_BOTH_DIRECTORY_INFO *info)
463{
464 de->name = &info->FileName[0];
465 de->namelen = le32_to_cpu(info->FileNameLength);
466 de->resume_key = info->FileIndex;
467}
468
469static void cifs_fill_dirent_std(struct cifs_dirent *de,
470 const FIND_FILE_STANDARD_INFO *info)
471{
472 de->name = &info->FileName[0];
473 /* one byte length, no endianess conversion */
474 de->namelen = info->FileNameLength;
475 de->resume_key = info->ResumeKey;
476}
477
478static int cifs_fill_dirent(struct cifs_dirent *de, const void *info,
479 u16 level, bool is_unicode)
480{
481 memset(de, 0, sizeof(*de));
482
483 switch (level) {
484 case SMB_FIND_FILE_UNIX:
485 cifs_fill_dirent_unix(de, info, is_unicode);
486 break;
487 case SMB_FIND_FILE_DIRECTORY_INFO:
488 cifs_fill_dirent_dir(de, info);
489 break;
490 case SMB_FIND_FILE_FULL_DIRECTORY_INFO:
491 cifs_fill_dirent_full(de, info);
492 break;
493 case SMB_FIND_FILE_ID_FULL_DIR_INFO:
494 cifs_fill_dirent_search(de, info);
495 break;
496 case SMB_FIND_FILE_BOTH_DIRECTORY_INFO:
497 cifs_fill_dirent_both(de, info);
498 break;
499 case SMB_FIND_FILE_INFO_STANDARD:
500 cifs_fill_dirent_std(de, info);
501 break;
502 default:
Joe Perchesf96637b2013-05-04 22:12:25 -0500503 cifs_dbg(FYI, "Unknown findfirst level %d\n", level);
Christoph Hellwigcda0ec62011-07-16 15:24:05 -0400504 return -EINVAL;
505 }
506
507 return 0;
508}
509
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510#define UNICODE_DOT cpu_to_le16(0x2e)
511
512/* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
Christoph Hellwigcda0ec62011-07-16 15:24:05 -0400513static int cifs_entry_is_dot(struct cifs_dirent *de, bool is_unicode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514{
515 int rc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516
Christoph Hellwigcda0ec62011-07-16 15:24:05 -0400517 if (!de->name)
518 return 0;
519
520 if (is_unicode) {
521 __le16 *ufilename = (__le16 *)de->name;
522 if (de->namelen == 2) {
523 /* check for . */
524 if (ufilename[0] == UNICODE_DOT)
525 rc = 1;
526 } else if (de->namelen == 4) {
527 /* check for .. */
528 if (ufilename[0] == UNICODE_DOT &&
529 ufilename[1] == UNICODE_DOT)
530 rc = 2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531 }
Christoph Hellwigcda0ec62011-07-16 15:24:05 -0400532 } else /* ASCII */ {
533 if (de->namelen == 1) {
534 if (de->name[0] == '.')
535 rc = 1;
536 } else if (de->namelen == 2) {
537 if (de->name[0] == '.' && de->name[1] == '.')
538 rc = 2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539 }
540 }
541
542 return rc;
543}
544
Steve Frencheafe8702005-09-15 21:47:30 -0700545/* Check if directory that we are searching has changed so we can decide
546 whether we can use the cached search results from the previous search */
Steve French38702532007-07-08 15:40:40 +0000547static int is_dir_changed(struct file *file)
Steve Frencheafe8702005-09-15 21:47:30 -0700548{
Al Viro496ad9a2013-01-23 17:07:38 -0500549 struct inode *inode = file_inode(file);
Christoph Hellwigc33f8d32007-04-02 18:47:20 +0000550 struct cifsInodeInfo *cifsInfo = CIFS_I(inode);
Steve Frencheafe8702005-09-15 21:47:30 -0700551
Christoph Hellwigc33f8d32007-04-02 18:47:20 +0000552 if (cifsInfo->time == 0)
Steve Frencheafe8702005-09-15 21:47:30 -0700553 return 1; /* directory was changed, perhaps due to unlink */
554 else
555 return 0;
556
557}
558
Steve French0752f152008-10-07 20:03:33 +0000559static int cifs_save_resume_key(const char *current_entry,
Christoph Hellwigeaf35b12011-07-16 15:24:37 -0400560 struct cifsFileInfo *file_info)
Steve French0752f152008-10-07 20:03:33 +0000561{
Christoph Hellwigeaf35b12011-07-16 15:24:37 -0400562 struct cifs_dirent de;
563 int rc;
Steve French0752f152008-10-07 20:03:33 +0000564
Christoph Hellwigeaf35b12011-07-16 15:24:37 -0400565 rc = cifs_fill_dirent(&de, current_entry, file_info->srch_inf.info_level,
566 file_info->srch_inf.unicode);
567 if (!rc) {
568 file_info->srch_inf.presume_name = de.name;
569 file_info->srch_inf.resume_name_len = de.namelen;
570 file_info->srch_inf.resume_key = de.resume_key;
Steve French0752f152008-10-07 20:03:33 +0000571 }
Steve French0752f152008-10-07 20:03:33 +0000572 return rc;
573}
574
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700575/*
576 * Find the corresponding entry in the search. Note that the SMB server returns
577 * search entries for . and .. which complicates logic here if we choose to
578 * parse for them and we do not assume that they are located in the findfirst
579 * return buffer. We start counting in the buffer with entry 2 and increment for
580 * every entry (do not increment for . or .. entry).
581 */
582static int
Al Virobe4ccdc2013-05-22 16:17:25 -0400583find_cifs_entry(const unsigned int xid, struct cifs_tcon *tcon, loff_t pos,
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700584 struct file *file, char **current_entry, int *num_to_ret)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585{
Shirish Pargaonkar2608bee2012-05-15 10:19:16 -0500586 __u16 search_flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587 int rc = 0;
588 int pos_in_buf = 0;
589 loff_t first_entry_in_buffer;
Al Virobe4ccdc2013-05-22 16:17:25 -0400590 loff_t index_to_find = pos;
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700591 struct cifsFileInfo *cfile = file->private_data;
Shirish Pargaonkar2608bee2012-05-15 10:19:16 -0500592 struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700593 struct TCP_Server_Info *server = tcon->ses->server;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594 /* check if index in the buffer */
Steve French50c2f752007-07-13 00:33:32 +0000595
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700596 if (!server->ops->query_dir_first || !server->ops->query_dir_next)
597 return -ENOSYS;
598
599 if ((cfile == NULL) || (current_entry == NULL) || (num_to_ret == NULL))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600 return -ENOENT;
Steve French50c2f752007-07-13 00:33:32 +0000601
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700602 *current_entry = NULL;
603 first_entry_in_buffer = cfile->srch_inf.index_of_last_entry -
604 cfile->srch_inf.entries_in_buffer;
Steve French60808232006-04-22 15:53:05 +0000605
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700606 /*
607 * If first entry in buf is zero then is first buffer
608 * in search response data which means it is likely . and ..
609 * will be in this buffer, although some servers do not return
610 * . and .. for the root of a drive and for those we need
611 * to start two entries earlier.
612 */
Steve French60808232006-04-22 15:53:05 +0000613
Steve French39798772006-05-31 22:40:51 +0000614 dump_cifs_file_struct(file, "In fce ");
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700615 if (((index_to_find < cfile->srch_inf.index_of_last_entry) &&
616 is_dir_changed(file)) || (index_to_find < first_entry_in_buffer)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617 /* close and restart search */
Joe Perchesf96637b2013-05-04 22:12:25 -0500618 cifs_dbg(FYI, "search backing up - close and restart search\n");
Jeff Layton44772882010-10-15 15:34:03 -0400619 spin_lock(&cifs_file_list_lock);
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700620 if (!cfile->srch_inf.endOfSearch && !cfile->invalidHandle) {
621 cfile->invalidHandle = true;
Jeff Layton44772882010-10-15 15:34:03 -0400622 spin_unlock(&cifs_file_list_lock);
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700623 if (server->ops->close)
624 server->ops->close(xid, tcon, &cfile->fid);
Steve Frenchddb4cbf2008-11-20 20:00:44 +0000625 } else
Jeff Layton44772882010-10-15 15:34:03 -0400626 spin_unlock(&cifs_file_list_lock);
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700627 if (cfile->srch_inf.ntwrk_buf_start) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500628 cifs_dbg(FYI, "freeing SMB ff cache buf on search rewind\n");
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700629 if (cfile->srch_inf.smallBuf)
630 cifs_small_buf_release(cfile->srch_inf.
Steve Frenchd47d7c12006-02-28 03:45:48 +0000631 ntwrk_buf_start);
632 else
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700633 cifs_buf_release(cfile->srch_inf.
Steve Frenchd47d7c12006-02-28 03:45:48 +0000634 ntwrk_buf_start);
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700635 cfile->srch_inf.ntwrk_buf_start = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636 }
Steve French38702532007-07-08 15:40:40 +0000637 rc = initiate_cifs_search(xid, file);
Steve French4523cc32007-04-30 20:13:06 +0000638 if (rc) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500639 cifs_dbg(FYI, "error %d reinitiating a search on rewind\n",
Joe Perchesb6b38f72010-04-21 03:50:45 +0000640 rc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641 return rc;
642 }
Jeff Layton70236762011-12-01 20:23:34 -0500643 /* FindFirst/Next set last_entry to NULL on malformed reply */
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700644 if (cfile->srch_inf.last_entry)
645 cifs_save_resume_key(cfile->srch_inf.last_entry, cfile);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646 }
647
Shirish Pargaonkar2608bee2012-05-15 10:19:16 -0500648 search_flags = CIFS_SEARCH_CLOSE_AT_END | CIFS_SEARCH_RETURN_RESUME;
649 if (backup_cred(cifs_sb))
650 search_flags |= CIFS_SEARCH_BACKUP_SEARCH;
651
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700652 while ((index_to_find >= cfile->srch_inf.index_of_last_entry) &&
653 (rc == 0) && !cfile->srch_inf.endOfSearch) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500654 cifs_dbg(FYI, "calling findnext2\n");
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700655 rc = server->ops->query_dir_next(xid, tcon, &cfile->fid,
656 search_flags,
657 &cfile->srch_inf);
Jeff Layton70236762011-12-01 20:23:34 -0500658 /* FindFirst/Next set last_entry to NULL on malformed reply */
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700659 if (cfile->srch_inf.last_entry)
660 cifs_save_resume_key(cfile->srch_inf.last_entry, cfile);
Steve French4523cc32007-04-30 20:13:06 +0000661 if (rc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662 return -ENOENT;
663 }
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700664 if (index_to_find < cfile->srch_inf.index_of_last_entry) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665 /* we found the buffer that contains the entry */
666 /* scan and find it */
667 int i;
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700668 char *cur_ent;
669 char *end_of_smb = cfile->srch_inf.ntwrk_buf_start +
670 server->ops->calc_smb_size(
671 cfile->srch_inf.ntwrk_buf_start);
Steve French60808232006-04-22 15:53:05 +0000672
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700673 cur_ent = cfile->srch_inf.srch_entries_start;
674 first_entry_in_buffer = cfile->srch_inf.index_of_last_entry
675 - cfile->srch_inf.entries_in_buffer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676 pos_in_buf = index_to_find - first_entry_in_buffer;
Joe Perchesf96637b2013-05-04 22:12:25 -0500677 cifs_dbg(FYI, "found entry - pos_in_buf %d\n", pos_in_buf);
Steve French5bafd762006-06-07 00:18:43 +0000678
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700679 for (i = 0; (i < (pos_in_buf)) && (cur_ent != NULL); i++) {
Steve Frenchdfb75332005-06-22 17:13:47 -0700680 /* go entry by entry figuring out which is first */
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700681 cur_ent = nxt_dir_entry(cur_ent, end_of_smb,
682 cfile->srch_inf.info_level);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683 }
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700684 if ((cur_ent == NULL) && (i < pos_in_buf)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685 /* BB fixme - check if we should flag this error */
Joe Perchesf96637b2013-05-04 22:12:25 -0500686 cifs_dbg(VFS, "reached end of buf searching for pos in buf %d index to find %lld rc %d\n",
687 pos_in_buf, index_to_find, rc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688 }
689 rc = 0;
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700690 *current_entry = cur_ent;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691 } else {
Joe Perchesf96637b2013-05-04 22:12:25 -0500692 cifs_dbg(FYI, "index not in buffer - could not findnext into it\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700693 return 0;
694 }
695
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700696 if (pos_in_buf >= cfile->srch_inf.entries_in_buffer) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500697 cifs_dbg(FYI, "can not return entries pos_in_buf beyond last\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698 *num_to_ret = 0;
699 } else
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700700 *num_to_ret = cfile->srch_inf.entries_in_buffer - pos_in_buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701
702 return rc;
703}
704
Al Virobe4ccdc2013-05-22 16:17:25 -0400705static int cifs_filldir(char *find_entry, struct file *file,
706 struct dir_context *ctx,
707 char *scratch_buf, unsigned int max_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708{
Christoph Hellwig9feed6f2011-07-16 15:23:49 -0400709 struct cifsFileInfo *file_info = file->private_data;
710 struct super_block *sb = file->f_path.dentry->d_sb;
711 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
Christoph Hellwigcda0ec62011-07-16 15:24:05 -0400712 struct cifs_dirent de = { NULL, };
Jeff Laytoncc0bad72009-06-25 00:56:52 -0400713 struct cifs_fattr fattr;
Christoph Hellwig9feed6f2011-07-16 15:23:49 -0400714 struct qstr name;
715 int rc = 0;
Christoph Hellwig9feed6f2011-07-16 15:23:49 -0400716 ino_t ino;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717
Christoph Hellwigcda0ec62011-07-16 15:24:05 -0400718 rc = cifs_fill_dirent(&de, find_entry, file_info->srch_inf.info_level,
719 file_info->srch_inf.unicode);
Steve French790fe572007-07-07 19:25:05 +0000720 if (rc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700721 return rc;
722
Christoph Hellwigf16d59b2011-07-16 15:24:22 -0400723 if (de.namelen > max_len) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500724 cifs_dbg(VFS, "bad search response length %zd past smb end\n",
725 de.namelen);
Christoph Hellwigf16d59b2011-07-16 15:24:22 -0400726 return -EINVAL;
727 }
Jeff Layton132ac7b2009-02-10 07:33:57 -0500728
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729 /* skip . and .. since we added them first */
Christoph Hellwigcda0ec62011-07-16 15:24:05 -0400730 if (cifs_entry_is_dot(&de, file_info->srch_inf.unicode))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731 return 0;
732
Christoph Hellwigf16d59b2011-07-16 15:24:22 -0400733 if (file_info->srch_inf.unicode) {
734 struct nls_table *nlt = cifs_sb->local_nls;
735
736 name.name = scratch_buf;
737 name.len =
Steve Frenchacbbb762012-01-18 22:32:33 -0600738 cifs_from_utf16((char *)name.name, (__le16 *)de.name,
739 UNICODE_NAME_MAX,
740 min_t(size_t, de.namelen,
741 (size_t)max_len), nlt,
742 cifs_sb->mnt_cifs_flags &
Christoph Hellwigf16d59b2011-07-16 15:24:22 -0400743 CIFS_MOUNT_MAP_SPECIAL_CHR);
744 name.len -= nls_nullsize(nlt);
745 } else {
746 name.name = de.name;
747 name.len = de.namelen;
748 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749
Christoph Hellwig9feed6f2011-07-16 15:23:49 -0400750 switch (file_info->srch_inf.info_level) {
751 case SMB_FIND_FILE_UNIX:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752 cifs_unix_basic_to_fattr(&fattr,
Christoph Hellwig9feed6f2011-07-16 15:23:49 -0400753 &((FILE_UNIX_INFO *)find_entry)->basic,
754 cifs_sb);
755 break;
756 case SMB_FIND_FILE_INFO_STANDARD:
757 cifs_std_info_to_fattr(&fattr,
758 (FIND_FILE_STANDARD_INFO *)find_entry,
759 cifs_sb);
760 break;
761 default:
762 cifs_dir_info_to_fattr(&fattr,
763 (FILE_DIRECTORY_INFO *)find_entry,
764 cifs_sb);
765 break;
766 }
Steve French38702532007-07-08 15:40:40 +0000767
Christoph Hellwigf16d59b2011-07-16 15:24:22 -0400768 if (de.ino && (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
769 fattr.cf_uniqueid = de.ino;
Jeff Laytonec06aed2009-11-06 14:18:29 -0500770 } else {
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400771 fattr.cf_uniqueid = iunique(sb, ROOT_I);
Jeff Laytonec06aed2009-11-06 14:18:29 -0500772 cifs_autodisable_serverino(cifs_sb);
773 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774
Stefan Metzmacher1b12b9c2010-08-05 21:19:56 +0200775 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) &&
776 CIFSCouldBeMFSymlink(&fattr))
777 /*
778 * trying to get the type and mode can be slow,
779 * so just call those regular files for now, and mark
780 * for reval
781 */
782 fattr.cf_flags |= CIFS_FATTR_NEED_REVAL;
783
Jeff Laytoneb1b3fa2012-12-03 06:05:37 -0500784 cifs_prime_dcache(file->f_dentry, &name, &fattr);
Steve French50c2f752007-07-13 00:33:32 +0000785
Jeff Laytoneb1b3fa2012-12-03 06:05:37 -0500786 ino = cifs_uniqueid_to_ino_t(fattr.cf_uniqueid);
Al Virobe4ccdc2013-05-22 16:17:25 -0400787 return !dir_emit(ctx, name.name, name.len, ino, fattr.cf_dtype);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700788}
789
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790
Al Virobe4ccdc2013-05-22 16:17:25 -0400791int cifs_readdir(struct file *file, struct dir_context *ctx)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700792{
793 int rc = 0;
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400794 unsigned int xid;
795 int i;
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700796 struct cifs_tcon *tcon;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700797 struct cifsFileInfo *cifsFile = NULL;
Steve French38702532007-07-08 15:40:40 +0000798 char *current_entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700799 int num_to_fill = 0;
Steve French38702532007-07-08 15:40:40 +0000800 char *tmp_buf = NULL;
Steve French50c2f752007-07-13 00:33:32 +0000801 char *end_of_smb;
Jeff Layton18295792009-04-30 20:45:45 -0400802 unsigned int max_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400804 xid = get_xid();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805
Suresh Jayaraman6221ddd2010-10-01 21:23:33 +0530806 /*
807 * Ensure FindFirst doesn't fail before doing filldir() for '.' and
808 * '..'. Otherwise we won't be able to notify VFS in case of failure.
809 */
810 if (file->private_data == NULL) {
811 rc = initiate_cifs_search(xid, file);
Joe Perchesf96637b2013-05-04 22:12:25 -0500812 cifs_dbg(FYI, "initiate cifs search rc %d\n", rc);
Suresh Jayaraman6221ddd2010-10-01 21:23:33 +0530813 if (rc)
814 goto rddir2_exit;
815 }
816
Al Virobe4ccdc2013-05-22 16:17:25 -0400817 if (!dir_emit_dots(file, ctx))
818 goto rddir2_exit;
819
820 /* 1) If search is active,
821 is in current search buffer?
822 if it before then restart search
823 if after then keep searching till find it */
824
825 if (file->private_data == NULL) {
826 rc = -EINVAL;
827 goto rddir2_exit;
828 }
829 cifsFile = file->private_data;
830 if (cifsFile->srch_inf.endOfSearch) {
831 if (cifsFile->srch_inf.emptyDir) {
832 cifs_dbg(FYI, "End of search, empty dir\n");
833 rc = 0;
834 goto rddir2_exit;
835 }
836 } /* else {
837 cifsFile->invalidHandle = true;
838 tcon->ses->server->close(xid, tcon, &cifsFile->fid);
839 } */
840
841 tcon = tlink_tcon(cifsFile->tlink);
842 rc = find_cifs_entry(xid, tcon, ctx->pos, file, &current_entry,
843 &num_to_fill);
844 if (rc) {
845 cifs_dbg(FYI, "fce error %d\n", rc);
846 goto rddir2_exit;
847 } else if (current_entry != NULL) {
848 cifs_dbg(FYI, "entry %lld found\n", ctx->pos);
849 } else {
850 cifs_dbg(FYI, "could not find entry\n");
851 goto rddir2_exit;
852 }
853 cifs_dbg(FYI, "loop through %d times filling dir for net buf %p\n",
854 num_to_fill, cifsFile->srch_inf.ntwrk_buf_start);
855 max_len = tcon->ses->server->ops->calc_smb_size(
856 cifsFile->srch_inf.ntwrk_buf_start);
857 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len;
858
859 tmp_buf = kmalloc(UNICODE_NAME_MAX, GFP_KERNEL);
860 if (tmp_buf == NULL) {
861 rc = -ENOMEM;
862 goto rddir2_exit;
863 }
864
865 for (i = 0; i < num_to_fill; i++) {
866 if (current_entry == NULL) {
867 /* evaluate whether this case is an error */
868 cifs_dbg(VFS, "past SMB end, num to fill %d i %d\n",
869 num_to_fill, i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700870 break;
871 }
Al Virobe4ccdc2013-05-22 16:17:25 -0400872 /*
873 * if buggy server returns . and .. late do we want to
874 * check for that here?
875 */
876 rc = cifs_filldir(current_entry, file, ctx,
877 tmp_buf, max_len);
Steve French790fe572007-07-07 19:25:05 +0000878 if (rc) {
Al Virobe4ccdc2013-05-22 16:17:25 -0400879 if (rc > 0)
880 rc = 0;
Kulikov Vasiliyf55fdcc2010-07-16 20:15:25 +0400881 break;
882 }
883
Al Virobe4ccdc2013-05-22 16:17:25 -0400884 ctx->pos++;
885 if (ctx->pos ==
886 cifsFile->srch_inf.index_of_last_entry) {
887 cifs_dbg(FYI, "last entry in buf at pos %lld %s\n",
888 ctx->pos, tmp_buf);
889 cifs_save_resume_key(current_entry, cifsFile);
890 break;
891 } else
892 current_entry =
893 nxt_dir_entry(current_entry, end_of_smb,
894 cifsFile->srch_inf.info_level);
895 }
896 kfree(tmp_buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700897
898rddir2_exit:
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400899 free_xid(xid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900 return rc;
901}