blob: b1eede3678a91d8d1ea3e350cb035cabf1da7ba7 [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
Nakajima Akira9e6d7222014-12-19 15:38:14 +090072 * a negative dentry or the uniqueid or filetype(mode) changed,
73 * then drop it and recreate it.
Jeff Laytoncc0bad72009-06-25 00:56:52 -040074 */
Jeff Laytoneb1b3fa2012-12-03 06:05:37 -050075static void
76cifs_prime_dcache(struct dentry *parent, struct qstr *name,
Jeff Laytoncc0bad72009-06-25 00:56:52 -040077 struct cifs_fattr *fattr)
78{
79 struct dentry *dentry, *alias;
80 struct inode *inode;
David Howells2b0143b2015-03-17 22:25:59 +000081 struct super_block *sb = d_inode(parent)->i_sb;
Jeff Layton2f2591a2012-12-18 06:35:10 -050082 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
Jeff Laytoncc0bad72009-06-25 00:56:52 -040083
Joe Perchesf96637b2013-05-04 22:12:25 -050084 cifs_dbg(FYI, "%s: for %s\n", __func__, name->name);
Jeff Laytoncc0bad72009-06-25 00:56:52 -040085
Al Viro4f522a22013-02-11 23:20:37 -050086 dentry = d_hash_and_lookup(parent, name);
87 if (unlikely(IS_ERR(dentry)))
88 return;
Jeff Layton05507fa2010-02-05 13:30:36 -050089
Jeff Laytoncc0bad72009-06-25 00:56:52 -040090 if (dentry) {
David Howells2b0143b2015-03-17 22:25:59 +000091 inode = d_inode(dentry);
Jeff Layton2f2591a2012-12-18 06:35:10 -050092 if (inode) {
Sachin Prabhuf5d06842015-04-02 14:51:35 +010093 if (d_mountpoint(dentry))
94 goto out;
Jeff Layton2f2591a2012-12-18 06:35:10 -050095 /*
96 * If we're generating inode numbers, then we don't
97 * want to clobber the existing one with the one that
98 * the readdir code created.
99 */
100 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM))
101 fattr->cf_uniqueid = CIFS_I(inode)->uniqueid;
102
Nakajima Akira9e6d7222014-12-19 15:38:14 +0900103 /* update inode in place
104 * if both i_ino and i_mode didn't change */
105 if (CIFS_I(inode)->uniqueid == fattr->cf_uniqueid &&
106 (inode->i_mode & S_IFMT) ==
107 (fattr->cf_mode & S_IFMT)) {
Jeff Layton2f2591a2012-12-18 06:35:10 -0500108 cifs_fattr_to_inode(inode, fattr);
109 goto out;
110 }
Jeff Laytoncd600422012-07-06 07:09:42 -0400111 }
Eric W. Biederman5542aa22014-02-13 09:46:25 -0800112 d_invalidate(dentry);
Jeff Laytoncc0bad72009-06-25 00:56:52 -0400113 dput(dentry);
114 }
115
Jeff Layton757c4f62013-08-07 10:29:08 -0400116 /*
117 * If we know that the inode will need to be revalidated immediately,
118 * then don't create a new dentry for it. We'll end up doing an on
119 * the wire call either way and this spares us an invalidation.
120 */
121 if (fattr->cf_flags & CIFS_FATTR_NEED_REVAL)
122 return;
123
Jeff Laytoncc0bad72009-06-25 00:56:52 -0400124 dentry = d_alloc(parent, name);
Jeff Laytoneb1b3fa2012-12-03 06:05:37 -0500125 if (!dentry)
126 return;
Jeff Laytoncc0bad72009-06-25 00:56:52 -0400127
128 inode = cifs_iget(sb, fattr);
Jeff Laytoneb1b3fa2012-12-03 06:05:37 -0500129 if (!inode)
130 goto out;
Jeff Laytoncc0bad72009-06-25 00:56:52 -0400131
Al Viro41d28bc2014-10-12 22:24:21 -0400132 alias = d_splice_alias(inode, dentry);
Jeff Laytoneb1b3fa2012-12-03 06:05:37 -0500133 if (alias && !IS_ERR(alias))
134 dput(alias);
135out:
136 dput(dentry);
Jeff Laytoncc0bad72009-06-25 00:56:52 -0400137}
138
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400139static void
140cifs_fill_common_info(struct cifs_fattr *fattr, struct cifs_sb_info *cifs_sb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141{
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400142 fattr->cf_uid = cifs_sb->mnt_uid;
143 fattr->cf_gid = cifs_sb->mnt_gid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400145 if (fattr->cf_cifsattrs & ATTR_DIRECTORY) {
146 fattr->cf_mode = S_IFDIR | cifs_sb->mnt_dir_mode;
147 fattr->cf_dtype = DT_DIR;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 } else {
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400149 fattr->cf_mode = S_IFREG | cifs_sb->mnt_file_mode;
150 fattr->cf_dtype = DT_REG;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151 }
152
Pavel Shilovskyeb85d94b2013-10-23 17:49:47 +0400153 /*
154 * We need to revalidate it further to make a decision about whether it
155 * is a symbolic link, DFS referral or a reparse point with a direct
156 * access like junctions, deduplicated files, NFS symlinks.
157 */
158 if (fattr->cf_cifsattrs & ATTR_REPARSE)
159 fattr->cf_flags |= CIFS_FATTR_NEED_REVAL;
160
Jim McDonough74d290d2013-09-21 10:36:10 -0500161 /* non-unix readdir doesn't provide nlink */
162 fattr->cf_flags |= CIFS_FATTR_UNKNOWN_NLINK;
163
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400164 if (fattr->cf_cifsattrs & ATTR_READONLY)
165 fattr->cf_mode &= ~S_IWUGO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166
Jeff Laytonccb5c002012-11-25 08:00:40 -0500167 /*
168 * We of course don't get ACL info in FIND_FIRST/NEXT results, so
169 * mark it for revalidation so that "ls -l" will look right. It might
170 * be super-slow, but if we don't do this then the ownership of files
171 * may look wrong since the inodes may not have timed out by the time
172 * "ls" does a stat() call on them.
173 */
174 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
175 fattr->cf_flags |= CIFS_FATTR_NEED_REVAL;
176
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400177 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL &&
178 fattr->cf_cifsattrs & ATTR_SYSTEM) {
179 if (fattr->cf_eof == 0) {
180 fattr->cf_mode &= ~S_IFMT;
181 fattr->cf_mode |= S_IFIFO;
182 fattr->cf_dtype = DT_FIFO;
Steve French3020a1f2005-11-18 11:31:10 -0800183 } else {
Jeff Layton4468eb32008-05-22 09:31:40 -0400184 /*
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400185 * trying to get the type and mode via SFU can be slow,
186 * so just call those regular files for now, and mark
187 * for reval
Jeff Layton4468eb32008-05-22 09:31:40 -0400188 */
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400189 fattr->cf_flags |= CIFS_FATTR_NEED_REVAL;
Jeff Layton4468eb32008-05-22 09:31:40 -0400190 }
191 }
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400192}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193
Shirish Pargaonkarc052e2b2012-09-28 12:21:14 -0500194void
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400195cifs_dir_info_to_fattr(struct cifs_fattr *fattr, FILE_DIRECTORY_INFO *info,
196 struct cifs_sb_info *cifs_sb)
197{
198 memset(fattr, 0, sizeof(*fattr));
199 fattr->cf_cifsattrs = le32_to_cpu(info->ExtFileAttributes);
200 fattr->cf_eof = le64_to_cpu(info->EndOfFile);
201 fattr->cf_bytes = le64_to_cpu(info->AllocationSize);
Jeff Layton20054bd2011-01-07 11:30:27 -0500202 fattr->cf_createtime = le64_to_cpu(info->CreationTime);
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400203 fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
204 fattr->cf_ctime = cifs_NTtimeToUnix(info->ChangeTime);
205 fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400207 cifs_fill_common_info(fattr, cifs_sb);
208}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209
Steve French15dd4782009-09-25 02:24:45 +0000210static void
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400211cifs_std_info_to_fattr(struct cifs_fattr *fattr, FIND_FILE_STANDARD_INFO *info,
212 struct cifs_sb_info *cifs_sb)
213{
Jeff Layton0d424ad2010-09-20 16:01:35 -0700214 int offset = cifs_sb_master_tcon(cifs_sb)->ses->server->timeAdj;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400216 memset(fattr, 0, sizeof(*fattr));
217 fattr->cf_atime = cnvrtDosUnixTm(info->LastAccessDate,
218 info->LastAccessTime, offset);
219 fattr->cf_ctime = cnvrtDosUnixTm(info->LastWriteDate,
220 info->LastWriteTime, offset);
221 fattr->cf_mtime = cnvrtDosUnixTm(info->LastWriteDate,
222 info->LastWriteTime, offset);
Steve Frenchf3f6ec42006-01-08 20:12:58 -0800223
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400224 fattr->cf_cifsattrs = le16_to_cpu(info->Attributes);
225 fattr->cf_bytes = le32_to_cpu(info->AllocationSize);
226 fattr->cf_eof = le32_to_cpu(info->DataSize);
Dave Kleikamp273d81d2006-06-01 19:41:23 +0000227
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400228 cifs_fill_common_info(fattr, cifs_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229}
230
Steve French0e0d2cf2009-05-01 05:27:32 +0000231/* BB eventually need to add the following helper function to
232 resolve NT_STATUS_STOPPED_ON_SYMLINK return code when
233 we try to do FindFirst on (NTFS) directory symlinks */
234/*
235int get_symlink_reparse_path(char *full_path, struct cifs_sb_info *cifs_sb,
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400236 unsigned int xid)
Steve French0e0d2cf2009-05-01 05:27:32 +0000237{
238 __u16 fid;
239 int len;
240 int oplock = 0;
241 int rc;
Steve French96daf2b2011-05-27 04:34:02 +0000242 struct cifs_tcon *ptcon = cifs_sb_tcon(cifs_sb);
Steve French0e0d2cf2009-05-01 05:27:32 +0000243 char *tmpbuffer;
244
245 rc = CIFSSMBOpen(xid, ptcon, full_path, FILE_OPEN, GENERIC_READ,
246 OPEN_REPARSE_POINT, &fid, &oplock, NULL,
247 cifs_sb->local_nls,
Steve French2baa2682014-09-27 02:19:01 -0500248 cifs_remap(cifs_sb);
Steve French0e0d2cf2009-05-01 05:27:32 +0000249 if (!rc) {
250 tmpbuffer = kmalloc(maxpath);
251 rc = CIFSSMBQueryReparseLinkInfo(xid, ptcon, full_path,
252 tmpbuffer,
253 maxpath -1,
254 fid,
255 cifs_sb->local_nls);
256 if (CIFSSMBClose(xid, ptcon, fid)) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500257 cifs_dbg(FYI, "Error closing temporary reparsepoint open\n");
Steve French0e0d2cf2009-05-01 05:27:32 +0000258 }
259 }
260}
261 */
262
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700263static int
264initiate_cifs_search(const unsigned int xid, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265{
Shirish Pargaonkar2608bee2012-05-15 10:19:16 -0500266 __u16 search_flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 int rc = 0;
Jeff Layton7ffec372010-09-29 19:51:11 -0400268 char *full_path = NULL;
Steve French38702532007-07-08 15:40:40 +0000269 struct cifsFileInfo *cifsFile;
Al Viro7119e222014-10-22 00:25:12 -0400270 struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
Jeff Layton59c55ba2010-11-12 06:30:29 -0500271 struct tcon_link *tlink = NULL;
Pavel Shilovsky29e20f92012-07-13 13:58:14 +0400272 struct cifs_tcon *tcon;
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700273 struct TCP_Server_Info *server;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274
Jeff Layton7ffec372010-09-29 19:51:11 -0400275 if (file->private_data == NULL) {
Jeff Layton59c55ba2010-11-12 06:30:29 -0500276 tlink = cifs_sb_tlink(cifs_sb);
277 if (IS_ERR(tlink))
278 return PTR_ERR(tlink);
279
280 cifsFile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
281 if (cifsFile == NULL) {
282 rc = -ENOMEM;
283 goto error_exit;
284 }
285 file->private_data = cifsFile;
286 cifsFile->tlink = cifs_get_tlink(tlink);
Pavel Shilovsky29e20f92012-07-13 13:58:14 +0400287 tcon = tlink_tcon(tlink);
Jeff Layton59c55ba2010-11-12 06:30:29 -0500288 } else {
289 cifsFile = file->private_data;
Pavel Shilovsky29e20f92012-07-13 13:58:14 +0400290 tcon = tlink_tcon(cifsFile->tlink);
Jeff Layton7ffec372010-09-29 19:51:11 -0400291 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700293 server = tcon->ses->server;
294
295 if (!server->ops->query_dir_first) {
296 rc = -ENOSYS;
297 goto error_exit;
298 }
299
Steve French4b18f2a2008-04-29 00:06:05 +0000300 cifsFile->invalidHandle = true;
301 cifsFile->srch_inf.endOfSearch = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302
Josef "Jeff" Sipeke6a00292006-12-08 02:36:48 -0800303 full_path = build_path_from_dentry(file->f_path.dentry);
Jeff Layton7ffec372010-09-29 19:51:11 -0400304 if (full_path == NULL) {
305 rc = -ENOMEM;
306 goto error_exit;
307 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308
Joe Perchesf96637b2013-05-04 22:12:25 -0500309 cifs_dbg(FYI, "Full path: %s start at: %lld\n", full_path, file->f_pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310
Steve French75cf6bd2005-04-28 22:41:04 -0700311ffirst_retry:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 /* test for Unix extensions */
Steve Frenchc18c8422007-07-18 23:21:09 +0000313 /* but now check for them on the share/mount not on the SMB session */
Pavel Shilovsky29e20f92012-07-13 13:58:14 +0400314 /* if (cap_unix(tcon->ses) { */
315 if (tcon->unix_ext)
Steve French5bafd762006-06-07 00:18:43 +0000316 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
Pavel Shilovsky29e20f92012-07-13 13:58:14 +0400317 else if ((tcon->ses->capabilities &
318 tcon->ses->server->vals->cap_nt_find) == 0) {
Steve French5bafd762006-06-07 00:18:43 +0000319 cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
321 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
322 } else /* not srvinos - BB fixme add check for backlevel? */ {
323 cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
324 }
325
Shirish Pargaonkar2608bee2012-05-15 10:19:16 -0500326 search_flags = CIFS_SEARCH_CLOSE_AT_END | CIFS_SEARCH_RETURN_RESUME;
327 if (backup_cred(cifs_sb))
328 search_flags |= CIFS_SEARCH_BACKUP_SEARCH;
329
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700330 rc = server->ops->query_dir_first(xid, tcon, full_path, cifs_sb,
331 &cifsFile->fid, search_flags,
332 &cifsFile->srch_inf);
333
Steve French4523cc32007-04-30 20:13:06 +0000334 if (rc == 0)
Steve French4b18f2a2008-04-29 00:06:05 +0000335 cifsFile->invalidHandle = false;
Steve Frenche836f012009-05-01 16:20:35 +0000336 /* BB add following call to handle readdir on new NTFS symlink errors
Steve French0e0d2cf2009-05-01 05:27:32 +0000337 else if STATUS_STOPPED_ON_SYMLINK
338 call get_symlink_reparse_path and retry with new path */
339 else if ((rc == -EOPNOTSUPP) &&
Steve French75cf6bd2005-04-28 22:41:04 -0700340 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
341 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
342 goto ffirst_retry;
343 }
Jeff Layton7ffec372010-09-29 19:51:11 -0400344error_exit:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345 kfree(full_path);
Jeff Layton7ffec372010-09-29 19:51:11 -0400346 cifs_put_tlink(tlink);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347 return rc;
348}
349
350/* return length of unicode string in bytes */
Christoph Hellwigcda0ec62011-07-16 15:24:05 -0400351static int cifs_unicode_bytelen(const char *str)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352{
353 int len;
Christoph Hellwigcda0ec62011-07-16 15:24:05 -0400354 const __le16 *ustr = (const __le16 *)str;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355
Steve French38702532007-07-08 15:40:40 +0000356 for (len = 0; len <= PATH_MAX; len++) {
Steve French4523cc32007-04-30 20:13:06 +0000357 if (ustr[len] == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358 return len << 1;
359 }
Joe Perchesf96637b2013-05-04 22:12:25 -0500360 cifs_dbg(FYI, "Unicode string longer than PATH_MAX found\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 return len << 1;
362}
363
Steve French5bafd762006-06-07 00:18:43 +0000364static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365{
Steve French38702532007-07-08 15:40:40 +0000366 char *new_entry;
Steve Frenchad7a2922008-02-07 23:25:02 +0000367 FILE_DIRECTORY_INFO *pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368
Steve French4523cc32007-04-30 20:13:06 +0000369 if (level == SMB_FIND_FILE_INFO_STANDARD) {
Steve Frenchad7a2922008-02-07 23:25:02 +0000370 FIND_FILE_STANDARD_INFO *pfData;
Steve French5bafd762006-06-07 00:18:43 +0000371 pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo;
372
373 new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) +
374 pfData->FileNameLength;
375 } else
376 new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
Joe Perchesf96637b2013-05-04 22:12:25 -0500377 cifs_dbg(FYI, "new entry %p old entry %p\n", new_entry, old_entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378 /* validate that new_entry is not past end of SMB */
Steve French4523cc32007-04-30 20:13:06 +0000379 if (new_entry >= end_of_smb) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500380 cifs_dbg(VFS, "search entry %p began after end of SMB %p old entry %p\n",
381 new_entry, end_of_smb, old_entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382 return NULL;
Steve French4523cc32007-04-30 20:13:06 +0000383 } else if (((level == SMB_FIND_FILE_INFO_STANDARD) &&
Steve French38702532007-07-08 15:40:40 +0000384 (new_entry + sizeof(FIND_FILE_STANDARD_INFO) > end_of_smb))
385 || ((level != SMB_FIND_FILE_INFO_STANDARD) &&
Steve French5bafd762006-06-07 00:18:43 +0000386 (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb))) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500387 cifs_dbg(VFS, "search entry %p extends after end of SMB %p\n",
388 new_entry, end_of_smb);
Steve French09d1db52005-04-28 22:41:08 -0700389 return NULL;
Steve French38702532007-07-08 15:40:40 +0000390 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391 return new_entry;
392
393}
394
Christoph Hellwigcda0ec62011-07-16 15:24:05 -0400395struct cifs_dirent {
396 const char *name;
397 size_t namelen;
398 u32 resume_key;
399 u64 ino;
400};
401
402static void cifs_fill_dirent_unix(struct cifs_dirent *de,
403 const FILE_UNIX_INFO *info, bool is_unicode)
404{
405 de->name = &info->FileName[0];
406 if (is_unicode)
407 de->namelen = cifs_unicode_bytelen(de->name);
408 else
409 de->namelen = strnlen(de->name, PATH_MAX);
410 de->resume_key = info->ResumeKey;
411 de->ino = le64_to_cpu(info->basic.UniqueId);
412}
413
414static void cifs_fill_dirent_dir(struct cifs_dirent *de,
415 const FILE_DIRECTORY_INFO *info)
416{
417 de->name = &info->FileName[0];
418 de->namelen = le32_to_cpu(info->FileNameLength);
419 de->resume_key = info->FileIndex;
420}
421
422static void cifs_fill_dirent_full(struct cifs_dirent *de,
423 const FILE_FULL_DIRECTORY_INFO *info)
424{
425 de->name = &info->FileName[0];
426 de->namelen = le32_to_cpu(info->FileNameLength);
427 de->resume_key = info->FileIndex;
428}
429
430static void cifs_fill_dirent_search(struct cifs_dirent *de,
431 const SEARCH_ID_FULL_DIR_INFO *info)
432{
433 de->name = &info->FileName[0];
434 de->namelen = le32_to_cpu(info->FileNameLength);
435 de->resume_key = info->FileIndex;
436 de->ino = le64_to_cpu(info->UniqueId);
437}
438
439static void cifs_fill_dirent_both(struct cifs_dirent *de,
440 const FILE_BOTH_DIRECTORY_INFO *info)
441{
442 de->name = &info->FileName[0];
443 de->namelen = le32_to_cpu(info->FileNameLength);
444 de->resume_key = info->FileIndex;
445}
446
447static void cifs_fill_dirent_std(struct cifs_dirent *de,
448 const FIND_FILE_STANDARD_INFO *info)
449{
450 de->name = &info->FileName[0];
451 /* one byte length, no endianess conversion */
452 de->namelen = info->FileNameLength;
453 de->resume_key = info->ResumeKey;
454}
455
456static int cifs_fill_dirent(struct cifs_dirent *de, const void *info,
457 u16 level, bool is_unicode)
458{
459 memset(de, 0, sizeof(*de));
460
461 switch (level) {
462 case SMB_FIND_FILE_UNIX:
463 cifs_fill_dirent_unix(de, info, is_unicode);
464 break;
465 case SMB_FIND_FILE_DIRECTORY_INFO:
466 cifs_fill_dirent_dir(de, info);
467 break;
468 case SMB_FIND_FILE_FULL_DIRECTORY_INFO:
469 cifs_fill_dirent_full(de, info);
470 break;
471 case SMB_FIND_FILE_ID_FULL_DIR_INFO:
472 cifs_fill_dirent_search(de, info);
473 break;
474 case SMB_FIND_FILE_BOTH_DIRECTORY_INFO:
475 cifs_fill_dirent_both(de, info);
476 break;
477 case SMB_FIND_FILE_INFO_STANDARD:
478 cifs_fill_dirent_std(de, info);
479 break;
480 default:
Joe Perchesf96637b2013-05-04 22:12:25 -0500481 cifs_dbg(FYI, "Unknown findfirst level %d\n", level);
Christoph Hellwigcda0ec62011-07-16 15:24:05 -0400482 return -EINVAL;
483 }
484
485 return 0;
486}
487
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488#define UNICODE_DOT cpu_to_le16(0x2e)
489
490/* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
Christoph Hellwigcda0ec62011-07-16 15:24:05 -0400491static int cifs_entry_is_dot(struct cifs_dirent *de, bool is_unicode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492{
493 int rc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494
Christoph Hellwigcda0ec62011-07-16 15:24:05 -0400495 if (!de->name)
496 return 0;
497
498 if (is_unicode) {
499 __le16 *ufilename = (__le16 *)de->name;
500 if (de->namelen == 2) {
501 /* check for . */
502 if (ufilename[0] == UNICODE_DOT)
503 rc = 1;
504 } else if (de->namelen == 4) {
505 /* check for .. */
506 if (ufilename[0] == UNICODE_DOT &&
507 ufilename[1] == UNICODE_DOT)
508 rc = 2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509 }
Christoph Hellwigcda0ec62011-07-16 15:24:05 -0400510 } else /* ASCII */ {
511 if (de->namelen == 1) {
512 if (de->name[0] == '.')
513 rc = 1;
514 } else if (de->namelen == 2) {
515 if (de->name[0] == '.' && de->name[1] == '.')
516 rc = 2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517 }
518 }
519
520 return rc;
521}
522
Steve Frencheafe8702005-09-15 21:47:30 -0700523/* Check if directory that we are searching has changed so we can decide
524 whether we can use the cached search results from the previous search */
Steve French38702532007-07-08 15:40:40 +0000525static int is_dir_changed(struct file *file)
Steve Frencheafe8702005-09-15 21:47:30 -0700526{
Al Viro496ad9a2013-01-23 17:07:38 -0500527 struct inode *inode = file_inode(file);
Christoph Hellwigc33f8d32007-04-02 18:47:20 +0000528 struct cifsInodeInfo *cifsInfo = CIFS_I(inode);
Steve Frencheafe8702005-09-15 21:47:30 -0700529
Christoph Hellwigc33f8d32007-04-02 18:47:20 +0000530 if (cifsInfo->time == 0)
Steve Frencheafe8702005-09-15 21:47:30 -0700531 return 1; /* directory was changed, perhaps due to unlink */
532 else
533 return 0;
534
535}
536
Steve French0752f152008-10-07 20:03:33 +0000537static int cifs_save_resume_key(const char *current_entry,
Christoph Hellwigeaf35b12011-07-16 15:24:37 -0400538 struct cifsFileInfo *file_info)
Steve French0752f152008-10-07 20:03:33 +0000539{
Christoph Hellwigeaf35b12011-07-16 15:24:37 -0400540 struct cifs_dirent de;
541 int rc;
Steve French0752f152008-10-07 20:03:33 +0000542
Christoph Hellwigeaf35b12011-07-16 15:24:37 -0400543 rc = cifs_fill_dirent(&de, current_entry, file_info->srch_inf.info_level,
544 file_info->srch_inf.unicode);
545 if (!rc) {
546 file_info->srch_inf.presume_name = de.name;
547 file_info->srch_inf.resume_name_len = de.namelen;
548 file_info->srch_inf.resume_key = de.resume_key;
Steve French0752f152008-10-07 20:03:33 +0000549 }
Steve French0752f152008-10-07 20:03:33 +0000550 return rc;
551}
552
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700553/*
554 * Find the corresponding entry in the search. Note that the SMB server returns
555 * search entries for . and .. which complicates logic here if we choose to
556 * parse for them and we do not assume that they are located in the findfirst
557 * return buffer. We start counting in the buffer with entry 2 and increment for
558 * every entry (do not increment for . or .. entry).
559 */
560static int
Al Virobe4ccdc2013-05-22 16:17:25 -0400561find_cifs_entry(const unsigned int xid, struct cifs_tcon *tcon, loff_t pos,
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700562 struct file *file, char **current_entry, int *num_to_ret)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563{
Shirish Pargaonkar2608bee2012-05-15 10:19:16 -0500564 __u16 search_flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565 int rc = 0;
566 int pos_in_buf = 0;
567 loff_t first_entry_in_buffer;
Al Virobe4ccdc2013-05-22 16:17:25 -0400568 loff_t index_to_find = pos;
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700569 struct cifsFileInfo *cfile = file->private_data;
Al Viro7119e222014-10-22 00:25:12 -0400570 struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700571 struct TCP_Server_Info *server = tcon->ses->server;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572 /* check if index in the buffer */
Steve French50c2f752007-07-13 00:33:32 +0000573
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700574 if (!server->ops->query_dir_first || !server->ops->query_dir_next)
575 return -ENOSYS;
576
577 if ((cfile == NULL) || (current_entry == NULL) || (num_to_ret == NULL))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578 return -ENOENT;
Steve French50c2f752007-07-13 00:33:32 +0000579
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700580 *current_entry = NULL;
581 first_entry_in_buffer = cfile->srch_inf.index_of_last_entry -
582 cfile->srch_inf.entries_in_buffer;
Steve French60808232006-04-22 15:53:05 +0000583
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700584 /*
585 * If first entry in buf is zero then is first buffer
586 * in search response data which means it is likely . and ..
587 * will be in this buffer, although some servers do not return
588 * . and .. for the root of a drive and for those we need
589 * to start two entries earlier.
590 */
Steve French60808232006-04-22 15:53:05 +0000591
Steve French39798772006-05-31 22:40:51 +0000592 dump_cifs_file_struct(file, "In fce ");
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700593 if (((index_to_find < cfile->srch_inf.index_of_last_entry) &&
594 is_dir_changed(file)) || (index_to_find < first_entry_in_buffer)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595 /* close and restart search */
Joe Perchesf96637b2013-05-04 22:12:25 -0500596 cifs_dbg(FYI, "search backing up - close and restart search\n");
Jeff Layton44772882010-10-15 15:34:03 -0400597 spin_lock(&cifs_file_list_lock);
Pavel Shilovsky52755802014-08-18 20:49:57 +0400598 if (server->ops->dir_needs_close(cfile)) {
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700599 cfile->invalidHandle = true;
Jeff Layton44772882010-10-15 15:34:03 -0400600 spin_unlock(&cifs_file_list_lock);
Pavel Shilovskyf7369062014-08-26 19:04:44 +0400601 if (server->ops->close_dir)
602 server->ops->close_dir(xid, tcon, &cfile->fid);
Steve Frenchddb4cbf2008-11-20 20:00:44 +0000603 } else
Jeff Layton44772882010-10-15 15:34:03 -0400604 spin_unlock(&cifs_file_list_lock);
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700605 if (cfile->srch_inf.ntwrk_buf_start) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500606 cifs_dbg(FYI, "freeing SMB ff cache buf on search rewind\n");
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700607 if (cfile->srch_inf.smallBuf)
608 cifs_small_buf_release(cfile->srch_inf.
Steve Frenchd47d7c12006-02-28 03:45:48 +0000609 ntwrk_buf_start);
610 else
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700611 cifs_buf_release(cfile->srch_inf.
Steve Frenchd47d7c12006-02-28 03:45:48 +0000612 ntwrk_buf_start);
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700613 cfile->srch_inf.ntwrk_buf_start = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614 }
Steve French38702532007-07-08 15:40:40 +0000615 rc = initiate_cifs_search(xid, file);
Steve French4523cc32007-04-30 20:13:06 +0000616 if (rc) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500617 cifs_dbg(FYI, "error %d reinitiating a search on rewind\n",
Joe Perchesb6b38f72010-04-21 03:50:45 +0000618 rc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619 return rc;
620 }
Jeff Layton70236762011-12-01 20:23:34 -0500621 /* FindFirst/Next set last_entry to NULL on malformed reply */
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700622 if (cfile->srch_inf.last_entry)
623 cifs_save_resume_key(cfile->srch_inf.last_entry, cfile);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624 }
625
Shirish Pargaonkar2608bee2012-05-15 10:19:16 -0500626 search_flags = CIFS_SEARCH_CLOSE_AT_END | CIFS_SEARCH_RETURN_RESUME;
627 if (backup_cred(cifs_sb))
628 search_flags |= CIFS_SEARCH_BACKUP_SEARCH;
629
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700630 while ((index_to_find >= cfile->srch_inf.index_of_last_entry) &&
631 (rc == 0) && !cfile->srch_inf.endOfSearch) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500632 cifs_dbg(FYI, "calling findnext2\n");
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700633 rc = server->ops->query_dir_next(xid, tcon, &cfile->fid,
634 search_flags,
635 &cfile->srch_inf);
Jeff Layton70236762011-12-01 20:23:34 -0500636 /* FindFirst/Next set last_entry to NULL on malformed reply */
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700637 if (cfile->srch_inf.last_entry)
638 cifs_save_resume_key(cfile->srch_inf.last_entry, cfile);
Steve French4523cc32007-04-30 20:13:06 +0000639 if (rc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640 return -ENOENT;
641 }
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700642 if (index_to_find < cfile->srch_inf.index_of_last_entry) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643 /* we found the buffer that contains the entry */
644 /* scan and find it */
645 int i;
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700646 char *cur_ent;
647 char *end_of_smb = cfile->srch_inf.ntwrk_buf_start +
648 server->ops->calc_smb_size(
649 cfile->srch_inf.ntwrk_buf_start);
Steve French60808232006-04-22 15:53:05 +0000650
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700651 cur_ent = cfile->srch_inf.srch_entries_start;
652 first_entry_in_buffer = cfile->srch_inf.index_of_last_entry
653 - cfile->srch_inf.entries_in_buffer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654 pos_in_buf = index_to_find - first_entry_in_buffer;
Joe Perchesf96637b2013-05-04 22:12:25 -0500655 cifs_dbg(FYI, "found entry - pos_in_buf %d\n", pos_in_buf);
Steve French5bafd762006-06-07 00:18:43 +0000656
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700657 for (i = 0; (i < (pos_in_buf)) && (cur_ent != NULL); i++) {
Steve Frenchdfb75332005-06-22 17:13:47 -0700658 /* go entry by entry figuring out which is first */
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700659 cur_ent = nxt_dir_entry(cur_ent, end_of_smb,
660 cfile->srch_inf.info_level);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661 }
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700662 if ((cur_ent == NULL) && (i < pos_in_buf)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663 /* BB fixme - check if we should flag this error */
Joe Perchesf96637b2013-05-04 22:12:25 -0500664 cifs_dbg(VFS, "reached end of buf searching for pos in buf %d index to find %lld rc %d\n",
665 pos_in_buf, index_to_find, rc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666 }
667 rc = 0;
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700668 *current_entry = cur_ent;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669 } else {
Joe Perchesf96637b2013-05-04 22:12:25 -0500670 cifs_dbg(FYI, "index not in buffer - could not findnext into it\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671 return 0;
672 }
673
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700674 if (pos_in_buf >= cfile->srch_inf.entries_in_buffer) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500675 cifs_dbg(FYI, "can not return entries pos_in_buf beyond last\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676 *num_to_ret = 0;
677 } else
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700678 *num_to_ret = cfile->srch_inf.entries_in_buffer - pos_in_buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679
680 return rc;
681}
682
Al Virobe4ccdc2013-05-22 16:17:25 -0400683static int cifs_filldir(char *find_entry, struct file *file,
684 struct dir_context *ctx,
685 char *scratch_buf, unsigned int max_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700686{
Christoph Hellwig9feed6f2011-07-16 15:23:49 -0400687 struct cifsFileInfo *file_info = file->private_data;
Al Viro7119e222014-10-22 00:25:12 -0400688 struct super_block *sb = file_inode(file)->i_sb;
Christoph Hellwig9feed6f2011-07-16 15:23:49 -0400689 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
Christoph Hellwigcda0ec62011-07-16 15:24:05 -0400690 struct cifs_dirent de = { NULL, };
Jeff Laytoncc0bad72009-06-25 00:56:52 -0400691 struct cifs_fattr fattr;
Christoph Hellwig9feed6f2011-07-16 15:23:49 -0400692 struct qstr name;
693 int rc = 0;
Christoph Hellwig9feed6f2011-07-16 15:23:49 -0400694 ino_t ino;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695
Christoph Hellwigcda0ec62011-07-16 15:24:05 -0400696 rc = cifs_fill_dirent(&de, find_entry, file_info->srch_inf.info_level,
697 file_info->srch_inf.unicode);
Steve French790fe572007-07-07 19:25:05 +0000698 if (rc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699 return rc;
700
Christoph Hellwigf16d59b2011-07-16 15:24:22 -0400701 if (de.namelen > max_len) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500702 cifs_dbg(VFS, "bad search response length %zd past smb end\n",
703 de.namelen);
Christoph Hellwigf16d59b2011-07-16 15:24:22 -0400704 return -EINVAL;
705 }
Jeff Layton132ac7b2009-02-10 07:33:57 -0500706
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707 /* skip . and .. since we added them first */
Christoph Hellwigcda0ec62011-07-16 15:24:05 -0400708 if (cifs_entry_is_dot(&de, file_info->srch_inf.unicode))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709 return 0;
710
Christoph Hellwigf16d59b2011-07-16 15:24:22 -0400711 if (file_info->srch_inf.unicode) {
712 struct nls_table *nlt = cifs_sb->local_nls;
Steve Frenchb6938552014-09-25 13:20:05 -0500713 int map_type;
714
Steve French2baa2682014-09-27 02:19:01 -0500715 map_type = cifs_remap(cifs_sb);
Christoph Hellwigf16d59b2011-07-16 15:24:22 -0400716 name.name = scratch_buf;
717 name.len =
Steve Frenchacbbb762012-01-18 22:32:33 -0600718 cifs_from_utf16((char *)name.name, (__le16 *)de.name,
719 UNICODE_NAME_MAX,
720 min_t(size_t, de.namelen,
Steve Frenchb6938552014-09-25 13:20:05 -0500721 (size_t)max_len), nlt, map_type);
Christoph Hellwigf16d59b2011-07-16 15:24:22 -0400722 name.len -= nls_nullsize(nlt);
723 } else {
724 name.name = de.name;
725 name.len = de.namelen;
726 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727
Christoph Hellwig9feed6f2011-07-16 15:23:49 -0400728 switch (file_info->srch_inf.info_level) {
729 case SMB_FIND_FILE_UNIX:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730 cifs_unix_basic_to_fattr(&fattr,
Christoph Hellwig9feed6f2011-07-16 15:23:49 -0400731 &((FILE_UNIX_INFO *)find_entry)->basic,
732 cifs_sb);
733 break;
734 case SMB_FIND_FILE_INFO_STANDARD:
735 cifs_std_info_to_fattr(&fattr,
736 (FIND_FILE_STANDARD_INFO *)find_entry,
737 cifs_sb);
738 break;
739 default:
740 cifs_dir_info_to_fattr(&fattr,
741 (FILE_DIRECTORY_INFO *)find_entry,
742 cifs_sb);
743 break;
744 }
Steve French38702532007-07-08 15:40:40 +0000745
Christoph Hellwigf16d59b2011-07-16 15:24:22 -0400746 if (de.ino && (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
747 fattr.cf_uniqueid = de.ino;
Jeff Laytonec06aed2009-11-06 14:18:29 -0500748 } else {
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400749 fattr.cf_uniqueid = iunique(sb, ROOT_I);
Jeff Laytonec06aed2009-11-06 14:18:29 -0500750 cifs_autodisable_serverino(cifs_sb);
751 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752
Stefan Metzmacher1b12b9c2010-08-05 21:19:56 +0200753 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) &&
Sachin Prabhucb084b12013-11-25 17:09:50 +0000754 couldbe_mf_symlink(&fattr))
Stefan Metzmacher1b12b9c2010-08-05 21:19:56 +0200755 /*
756 * trying to get the type and mode can be slow,
757 * so just call those regular files for now, and mark
758 * for reval
759 */
760 fattr.cf_flags |= CIFS_FATTR_NEED_REVAL;
761
Al Virob5830432014-10-31 01:22:04 -0400762 cifs_prime_dcache(file->f_path.dentry, &name, &fattr);
Steve French50c2f752007-07-13 00:33:32 +0000763
Jeff Laytoneb1b3fa2012-12-03 06:05:37 -0500764 ino = cifs_uniqueid_to_ino_t(fattr.cf_uniqueid);
Al Virobe4ccdc2013-05-22 16:17:25 -0400765 return !dir_emit(ctx, name.name, name.len, ino, fattr.cf_dtype);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766}
767
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768
Al Virobe4ccdc2013-05-22 16:17:25 -0400769int cifs_readdir(struct file *file, struct dir_context *ctx)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770{
771 int rc = 0;
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400772 unsigned int xid;
773 int i;
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700774 struct cifs_tcon *tcon;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700775 struct cifsFileInfo *cifsFile = NULL;
Steve French38702532007-07-08 15:40:40 +0000776 char *current_entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777 int num_to_fill = 0;
Steve French38702532007-07-08 15:40:40 +0000778 char *tmp_buf = NULL;
Steve French50c2f752007-07-13 00:33:32 +0000779 char *end_of_smb;
Jeff Layton18295792009-04-30 20:45:45 -0400780 unsigned int max_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400782 xid = get_xid();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783
Suresh Jayaraman6221ddd2010-10-01 21:23:33 +0530784 /*
785 * Ensure FindFirst doesn't fail before doing filldir() for '.' and
786 * '..'. Otherwise we won't be able to notify VFS in case of failure.
787 */
788 if (file->private_data == NULL) {
789 rc = initiate_cifs_search(xid, file);
Joe Perchesf96637b2013-05-04 22:12:25 -0500790 cifs_dbg(FYI, "initiate cifs search rc %d\n", rc);
Suresh Jayaraman6221ddd2010-10-01 21:23:33 +0530791 if (rc)
792 goto rddir2_exit;
793 }
794
Al Virobe4ccdc2013-05-22 16:17:25 -0400795 if (!dir_emit_dots(file, ctx))
796 goto rddir2_exit;
797
798 /* 1) If search is active,
799 is in current search buffer?
800 if it before then restart search
801 if after then keep searching till find it */
802
Al Virobe4ccdc2013-05-22 16:17:25 -0400803 cifsFile = file->private_data;
804 if (cifsFile->srch_inf.endOfSearch) {
805 if (cifsFile->srch_inf.emptyDir) {
806 cifs_dbg(FYI, "End of search, empty dir\n");
807 rc = 0;
808 goto rddir2_exit;
809 }
810 } /* else {
811 cifsFile->invalidHandle = true;
812 tcon->ses->server->close(xid, tcon, &cifsFile->fid);
813 } */
814
815 tcon = tlink_tcon(cifsFile->tlink);
816 rc = find_cifs_entry(xid, tcon, ctx->pos, file, &current_entry,
817 &num_to_fill);
818 if (rc) {
819 cifs_dbg(FYI, "fce error %d\n", rc);
820 goto rddir2_exit;
821 } else if (current_entry != NULL) {
822 cifs_dbg(FYI, "entry %lld found\n", ctx->pos);
823 } else {
824 cifs_dbg(FYI, "could not find entry\n");
825 goto rddir2_exit;
826 }
827 cifs_dbg(FYI, "loop through %d times filling dir for net buf %p\n",
828 num_to_fill, cifsFile->srch_inf.ntwrk_buf_start);
829 max_len = tcon->ses->server->ops->calc_smb_size(
830 cifsFile->srch_inf.ntwrk_buf_start);
831 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len;
832
833 tmp_buf = kmalloc(UNICODE_NAME_MAX, GFP_KERNEL);
834 if (tmp_buf == NULL) {
835 rc = -ENOMEM;
836 goto rddir2_exit;
837 }
838
839 for (i = 0; i < num_to_fill; i++) {
840 if (current_entry == NULL) {
841 /* evaluate whether this case is an error */
842 cifs_dbg(VFS, "past SMB end, num to fill %d i %d\n",
843 num_to_fill, i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700844 break;
845 }
Al Virobe4ccdc2013-05-22 16:17:25 -0400846 /*
847 * if buggy server returns . and .. late do we want to
848 * check for that here?
849 */
850 rc = cifs_filldir(current_entry, file, ctx,
851 tmp_buf, max_len);
Steve French790fe572007-07-07 19:25:05 +0000852 if (rc) {
Al Virobe4ccdc2013-05-22 16:17:25 -0400853 if (rc > 0)
854 rc = 0;
Kulikov Vasiliyf55fdcc2010-07-16 20:15:25 +0400855 break;
856 }
857
Al Virobe4ccdc2013-05-22 16:17:25 -0400858 ctx->pos++;
859 if (ctx->pos ==
860 cifsFile->srch_inf.index_of_last_entry) {
861 cifs_dbg(FYI, "last entry in buf at pos %lld %s\n",
862 ctx->pos, tmp_buf);
863 cifs_save_resume_key(current_entry, cifsFile);
864 break;
865 } else
866 current_entry =
867 nxt_dir_entry(current_entry, end_of_smb,
868 cifsFile->srch_inf.info_level);
869 }
870 kfree(tmp_buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871
872rddir2_exit:
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400873 free_xid(xid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874 return rc;
875}