blob: c295338e0a98ce95a71c60afedc87ad9bd5267b5 [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;
81 struct super_block *sb = parent->d_inode->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) {
Jeff Laytoncd600422012-07-06 07:09:42 -040091 inode = dentry->d_inode;
Jeff Layton2f2591a2012-12-18 06:35:10 -050092 if (inode) {
93 /*
94 * If we're generating inode numbers, then we don't
95 * want to clobber the existing one with the one that
96 * the readdir code created.
97 */
98 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM))
99 fattr->cf_uniqueid = CIFS_I(inode)->uniqueid;
100
Nakajima Akira9e6d7222014-12-19 15:38:14 +0900101 /* update inode in place
102 * if both i_ino and i_mode didn't change */
103 if (CIFS_I(inode)->uniqueid == fattr->cf_uniqueid &&
104 (inode->i_mode & S_IFMT) ==
105 (fattr->cf_mode & S_IFMT)) {
Jeff Layton2f2591a2012-12-18 06:35:10 -0500106 cifs_fattr_to_inode(inode, fattr);
107 goto out;
108 }
Jeff Laytoncd600422012-07-06 07:09:42 -0400109 }
Eric W. Biederman5542aa22014-02-13 09:46:25 -0800110 d_invalidate(dentry);
Jeff Laytoncc0bad72009-06-25 00:56:52 -0400111 dput(dentry);
112 }
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
Al Viro41d28bc2014-10-12 22:24:21 -0400130 alias = d_splice_alias(inode, dentry);
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 Layton0b8f18e2009-07-09 01:46:37 -0400137static void
138cifs_fill_common_info(struct cifs_fattr *fattr, struct cifs_sb_info *cifs_sb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139{
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400140 fattr->cf_uid = cifs_sb->mnt_uid;
141 fattr->cf_gid = cifs_sb->mnt_gid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400143 if (fattr->cf_cifsattrs & ATTR_DIRECTORY) {
144 fattr->cf_mode = S_IFDIR | cifs_sb->mnt_dir_mode;
145 fattr->cf_dtype = DT_DIR;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 } else {
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400147 fattr->cf_mode = S_IFREG | cifs_sb->mnt_file_mode;
148 fattr->cf_dtype = DT_REG;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149 }
150
Pavel Shilovskyeb85d94b2013-10-23 17:49:47 +0400151 /*
152 * We need to revalidate it further to make a decision about whether it
153 * is a symbolic link, DFS referral or a reparse point with a direct
154 * access like junctions, deduplicated files, NFS symlinks.
155 */
156 if (fattr->cf_cifsattrs & ATTR_REPARSE)
157 fattr->cf_flags |= CIFS_FATTR_NEED_REVAL;
158
Jim McDonough74d290d2013-09-21 10:36:10 -0500159 /* non-unix readdir doesn't provide nlink */
160 fattr->cf_flags |= CIFS_FATTR_UNKNOWN_NLINK;
161
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400162 if (fattr->cf_cifsattrs & ATTR_READONLY)
163 fattr->cf_mode &= ~S_IWUGO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164
Jeff Laytonccb5c002012-11-25 08:00:40 -0500165 /*
166 * We of course don't get ACL info in FIND_FIRST/NEXT results, so
167 * mark it for revalidation so that "ls -l" will look right. It might
168 * be super-slow, but if we don't do this then the ownership of files
169 * may look wrong since the inodes may not have timed out by the time
170 * "ls" does a stat() call on them.
171 */
172 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
173 fattr->cf_flags |= CIFS_FATTR_NEED_REVAL;
174
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400175 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL &&
176 fattr->cf_cifsattrs & ATTR_SYSTEM) {
177 if (fattr->cf_eof == 0) {
178 fattr->cf_mode &= ~S_IFMT;
179 fattr->cf_mode |= S_IFIFO;
180 fattr->cf_dtype = DT_FIFO;
Steve French3020a1f2005-11-18 11:31:10 -0800181 } else {
Jeff Layton4468eb32008-05-22 09:31:40 -0400182 /*
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400183 * trying to get the type and mode via SFU can be slow,
184 * so just call those regular files for now, and mark
185 * for reval
Jeff Layton4468eb32008-05-22 09:31:40 -0400186 */
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400187 fattr->cf_flags |= CIFS_FATTR_NEED_REVAL;
Jeff Layton4468eb32008-05-22 09:31:40 -0400188 }
189 }
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400190}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191
Shirish Pargaonkarc052e2b2012-09-28 12:21:14 -0500192void
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400193cifs_dir_info_to_fattr(struct cifs_fattr *fattr, FILE_DIRECTORY_INFO *info,
194 struct cifs_sb_info *cifs_sb)
195{
196 memset(fattr, 0, sizeof(*fattr));
197 fattr->cf_cifsattrs = le32_to_cpu(info->ExtFileAttributes);
198 fattr->cf_eof = le64_to_cpu(info->EndOfFile);
199 fattr->cf_bytes = le64_to_cpu(info->AllocationSize);
Jeff Layton20054bd2011-01-07 11:30:27 -0500200 fattr->cf_createtime = le64_to_cpu(info->CreationTime);
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400201 fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
202 fattr->cf_ctime = cifs_NTtimeToUnix(info->ChangeTime);
203 fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400205 cifs_fill_common_info(fattr, cifs_sb);
206}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207
Steve French15dd4782009-09-25 02:24:45 +0000208static void
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400209cifs_std_info_to_fattr(struct cifs_fattr *fattr, FIND_FILE_STANDARD_INFO *info,
210 struct cifs_sb_info *cifs_sb)
211{
Jeff Layton0d424ad2010-09-20 16:01:35 -0700212 int offset = cifs_sb_master_tcon(cifs_sb)->ses->server->timeAdj;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400214 memset(fattr, 0, sizeof(*fattr));
215 fattr->cf_atime = cnvrtDosUnixTm(info->LastAccessDate,
216 info->LastAccessTime, offset);
217 fattr->cf_ctime = cnvrtDosUnixTm(info->LastWriteDate,
218 info->LastWriteTime, offset);
219 fattr->cf_mtime = cnvrtDosUnixTm(info->LastWriteDate,
220 info->LastWriteTime, offset);
Steve Frenchf3f6ec42006-01-08 20:12:58 -0800221
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400222 fattr->cf_cifsattrs = le16_to_cpu(info->Attributes);
223 fattr->cf_bytes = le32_to_cpu(info->AllocationSize);
224 fattr->cf_eof = le32_to_cpu(info->DataSize);
Dave Kleikamp273d81d2006-06-01 19:41:23 +0000225
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400226 cifs_fill_common_info(fattr, cifs_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227}
228
Steve French0e0d2cf2009-05-01 05:27:32 +0000229/* BB eventually need to add the following helper function to
230 resolve NT_STATUS_STOPPED_ON_SYMLINK return code when
231 we try to do FindFirst on (NTFS) directory symlinks */
232/*
233int get_symlink_reparse_path(char *full_path, struct cifs_sb_info *cifs_sb,
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400234 unsigned int xid)
Steve French0e0d2cf2009-05-01 05:27:32 +0000235{
236 __u16 fid;
237 int len;
238 int oplock = 0;
239 int rc;
Steve French96daf2b2011-05-27 04:34:02 +0000240 struct cifs_tcon *ptcon = cifs_sb_tcon(cifs_sb);
Steve French0e0d2cf2009-05-01 05:27:32 +0000241 char *tmpbuffer;
242
243 rc = CIFSSMBOpen(xid, ptcon, full_path, FILE_OPEN, GENERIC_READ,
244 OPEN_REPARSE_POINT, &fid, &oplock, NULL,
245 cifs_sb->local_nls,
Steve French2baa2682014-09-27 02:19:01 -0500246 cifs_remap(cifs_sb);
Steve French0e0d2cf2009-05-01 05:27:32 +0000247 if (!rc) {
248 tmpbuffer = kmalloc(maxpath);
249 rc = CIFSSMBQueryReparseLinkInfo(xid, ptcon, full_path,
250 tmpbuffer,
251 maxpath -1,
252 fid,
253 cifs_sb->local_nls);
254 if (CIFSSMBClose(xid, ptcon, fid)) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500255 cifs_dbg(FYI, "Error closing temporary reparsepoint open\n");
Steve French0e0d2cf2009-05-01 05:27:32 +0000256 }
257 }
258}
259 */
260
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700261static int
262initiate_cifs_search(const unsigned int xid, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263{
Shirish Pargaonkar2608bee2012-05-15 10:19:16 -0500264 __u16 search_flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 int rc = 0;
Jeff Layton7ffec372010-09-29 19:51:11 -0400266 char *full_path = NULL;
Steve French38702532007-07-08 15:40:40 +0000267 struct cifsFileInfo *cifsFile;
Al Viro7119e222014-10-22 00:25:12 -0400268 struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
Jeff Layton59c55ba2010-11-12 06:30:29 -0500269 struct tcon_link *tlink = NULL;
Pavel Shilovsky29e20f92012-07-13 13:58:14 +0400270 struct cifs_tcon *tcon;
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700271 struct TCP_Server_Info *server;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272
Jeff Layton7ffec372010-09-29 19:51:11 -0400273 if (file->private_data == NULL) {
Jeff Layton59c55ba2010-11-12 06:30:29 -0500274 tlink = cifs_sb_tlink(cifs_sb);
275 if (IS_ERR(tlink))
276 return PTR_ERR(tlink);
277
278 cifsFile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
279 if (cifsFile == NULL) {
280 rc = -ENOMEM;
281 goto error_exit;
282 }
283 file->private_data = cifsFile;
284 cifsFile->tlink = cifs_get_tlink(tlink);
Pavel Shilovsky29e20f92012-07-13 13:58:14 +0400285 tcon = tlink_tcon(tlink);
Jeff Layton59c55ba2010-11-12 06:30:29 -0500286 } else {
287 cifsFile = file->private_data;
Pavel Shilovsky29e20f92012-07-13 13:58:14 +0400288 tcon = tlink_tcon(cifsFile->tlink);
Jeff Layton7ffec372010-09-29 19:51:11 -0400289 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700291 server = tcon->ses->server;
292
293 if (!server->ops->query_dir_first) {
294 rc = -ENOSYS;
295 goto error_exit;
296 }
297
Steve French4b18f2a2008-04-29 00:06:05 +0000298 cifsFile->invalidHandle = true;
299 cifsFile->srch_inf.endOfSearch = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300
Josef "Jeff" Sipeke6a00292006-12-08 02:36:48 -0800301 full_path = build_path_from_dentry(file->f_path.dentry);
Jeff Layton7ffec372010-09-29 19:51:11 -0400302 if (full_path == NULL) {
303 rc = -ENOMEM;
304 goto error_exit;
305 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306
Joe Perchesf96637b2013-05-04 22:12:25 -0500307 cifs_dbg(FYI, "Full path: %s start at: %lld\n", full_path, file->f_pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308
Steve French75cf6bd2005-04-28 22:41:04 -0700309ffirst_retry:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 /* test for Unix extensions */
Steve Frenchc18c8422007-07-18 23:21:09 +0000311 /* but now check for them on the share/mount not on the SMB session */
Pavel Shilovsky29e20f92012-07-13 13:58:14 +0400312 /* if (cap_unix(tcon->ses) { */
313 if (tcon->unix_ext)
Steve French5bafd762006-06-07 00:18:43 +0000314 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
Pavel Shilovsky29e20f92012-07-13 13:58:14 +0400315 else if ((tcon->ses->capabilities &
316 tcon->ses->server->vals->cap_nt_find) == 0) {
Steve French5bafd762006-06-07 00:18:43 +0000317 cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
319 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
320 } else /* not srvinos - BB fixme add check for backlevel? */ {
321 cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
322 }
323
Shirish Pargaonkar2608bee2012-05-15 10:19:16 -0500324 search_flags = CIFS_SEARCH_CLOSE_AT_END | CIFS_SEARCH_RETURN_RESUME;
325 if (backup_cred(cifs_sb))
326 search_flags |= CIFS_SEARCH_BACKUP_SEARCH;
327
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700328 rc = server->ops->query_dir_first(xid, tcon, full_path, cifs_sb,
329 &cifsFile->fid, search_flags,
330 &cifsFile->srch_inf);
331
Steve French4523cc32007-04-30 20:13:06 +0000332 if (rc == 0)
Steve French4b18f2a2008-04-29 00:06:05 +0000333 cifsFile->invalidHandle = false;
Steve Frenche836f012009-05-01 16:20:35 +0000334 /* BB add following call to handle readdir on new NTFS symlink errors
Steve French0e0d2cf2009-05-01 05:27:32 +0000335 else if STATUS_STOPPED_ON_SYMLINK
336 call get_symlink_reparse_path and retry with new path */
337 else if ((rc == -EOPNOTSUPP) &&
Steve French75cf6bd2005-04-28 22:41:04 -0700338 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
339 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
340 goto ffirst_retry;
341 }
Jeff Layton7ffec372010-09-29 19:51:11 -0400342error_exit:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343 kfree(full_path);
Jeff Layton7ffec372010-09-29 19:51:11 -0400344 cifs_put_tlink(tlink);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345 return rc;
346}
347
348/* return length of unicode string in bytes */
Christoph Hellwigcda0ec62011-07-16 15:24:05 -0400349static int cifs_unicode_bytelen(const char *str)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350{
351 int len;
Christoph Hellwigcda0ec62011-07-16 15:24:05 -0400352 const __le16 *ustr = (const __le16 *)str;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353
Steve French38702532007-07-08 15:40:40 +0000354 for (len = 0; len <= PATH_MAX; len++) {
Steve French4523cc32007-04-30 20:13:06 +0000355 if (ustr[len] == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 return len << 1;
357 }
Joe Perchesf96637b2013-05-04 22:12:25 -0500358 cifs_dbg(FYI, "Unicode string longer than PATH_MAX found\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359 return len << 1;
360}
361
Steve French5bafd762006-06-07 00:18:43 +0000362static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363{
Steve French38702532007-07-08 15:40:40 +0000364 char *new_entry;
Steve Frenchad7a2922008-02-07 23:25:02 +0000365 FILE_DIRECTORY_INFO *pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366
Steve French4523cc32007-04-30 20:13:06 +0000367 if (level == SMB_FIND_FILE_INFO_STANDARD) {
Steve Frenchad7a2922008-02-07 23:25:02 +0000368 FIND_FILE_STANDARD_INFO *pfData;
Steve French5bafd762006-06-07 00:18:43 +0000369 pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo;
370
371 new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) +
372 pfData->FileNameLength;
373 } else
374 new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
Joe Perchesf96637b2013-05-04 22:12:25 -0500375 cifs_dbg(FYI, "new entry %p old entry %p\n", new_entry, old_entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 /* validate that new_entry is not past end of SMB */
Steve French4523cc32007-04-30 20:13:06 +0000377 if (new_entry >= end_of_smb) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500378 cifs_dbg(VFS, "search entry %p began after end of SMB %p old entry %p\n",
379 new_entry, end_of_smb, old_entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380 return NULL;
Steve French4523cc32007-04-30 20:13:06 +0000381 } else if (((level == SMB_FIND_FILE_INFO_STANDARD) &&
Steve French38702532007-07-08 15:40:40 +0000382 (new_entry + sizeof(FIND_FILE_STANDARD_INFO) > end_of_smb))
383 || ((level != SMB_FIND_FILE_INFO_STANDARD) &&
Steve French5bafd762006-06-07 00:18:43 +0000384 (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb))) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500385 cifs_dbg(VFS, "search entry %p extends after end of SMB %p\n",
386 new_entry, end_of_smb);
Steve French09d1db52005-04-28 22:41:08 -0700387 return NULL;
Steve French38702532007-07-08 15:40:40 +0000388 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389 return new_entry;
390
391}
392
Christoph Hellwigcda0ec62011-07-16 15:24:05 -0400393struct cifs_dirent {
394 const char *name;
395 size_t namelen;
396 u32 resume_key;
397 u64 ino;
398};
399
400static void cifs_fill_dirent_unix(struct cifs_dirent *de,
401 const FILE_UNIX_INFO *info, bool is_unicode)
402{
403 de->name = &info->FileName[0];
404 if (is_unicode)
405 de->namelen = cifs_unicode_bytelen(de->name);
406 else
407 de->namelen = strnlen(de->name, PATH_MAX);
408 de->resume_key = info->ResumeKey;
409 de->ino = le64_to_cpu(info->basic.UniqueId);
410}
411
412static void cifs_fill_dirent_dir(struct cifs_dirent *de,
413 const FILE_DIRECTORY_INFO *info)
414{
415 de->name = &info->FileName[0];
416 de->namelen = le32_to_cpu(info->FileNameLength);
417 de->resume_key = info->FileIndex;
418}
419
420static void cifs_fill_dirent_full(struct cifs_dirent *de,
421 const FILE_FULL_DIRECTORY_INFO *info)
422{
423 de->name = &info->FileName[0];
424 de->namelen = le32_to_cpu(info->FileNameLength);
425 de->resume_key = info->FileIndex;
426}
427
428static void cifs_fill_dirent_search(struct cifs_dirent *de,
429 const SEARCH_ID_FULL_DIR_INFO *info)
430{
431 de->name = &info->FileName[0];
432 de->namelen = le32_to_cpu(info->FileNameLength);
433 de->resume_key = info->FileIndex;
434 de->ino = le64_to_cpu(info->UniqueId);
435}
436
437static void cifs_fill_dirent_both(struct cifs_dirent *de,
438 const FILE_BOTH_DIRECTORY_INFO *info)
439{
440 de->name = &info->FileName[0];
441 de->namelen = le32_to_cpu(info->FileNameLength);
442 de->resume_key = info->FileIndex;
443}
444
445static void cifs_fill_dirent_std(struct cifs_dirent *de,
446 const FIND_FILE_STANDARD_INFO *info)
447{
448 de->name = &info->FileName[0];
449 /* one byte length, no endianess conversion */
450 de->namelen = info->FileNameLength;
451 de->resume_key = info->ResumeKey;
452}
453
454static int cifs_fill_dirent(struct cifs_dirent *de, const void *info,
455 u16 level, bool is_unicode)
456{
457 memset(de, 0, sizeof(*de));
458
459 switch (level) {
460 case SMB_FIND_FILE_UNIX:
461 cifs_fill_dirent_unix(de, info, is_unicode);
462 break;
463 case SMB_FIND_FILE_DIRECTORY_INFO:
464 cifs_fill_dirent_dir(de, info);
465 break;
466 case SMB_FIND_FILE_FULL_DIRECTORY_INFO:
467 cifs_fill_dirent_full(de, info);
468 break;
469 case SMB_FIND_FILE_ID_FULL_DIR_INFO:
470 cifs_fill_dirent_search(de, info);
471 break;
472 case SMB_FIND_FILE_BOTH_DIRECTORY_INFO:
473 cifs_fill_dirent_both(de, info);
474 break;
475 case SMB_FIND_FILE_INFO_STANDARD:
476 cifs_fill_dirent_std(de, info);
477 break;
478 default:
Joe Perchesf96637b2013-05-04 22:12:25 -0500479 cifs_dbg(FYI, "Unknown findfirst level %d\n", level);
Christoph Hellwigcda0ec62011-07-16 15:24:05 -0400480 return -EINVAL;
481 }
482
483 return 0;
484}
485
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486#define UNICODE_DOT cpu_to_le16(0x2e)
487
488/* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
Christoph Hellwigcda0ec62011-07-16 15:24:05 -0400489static int cifs_entry_is_dot(struct cifs_dirent *de, bool is_unicode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490{
491 int rc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492
Christoph Hellwigcda0ec62011-07-16 15:24:05 -0400493 if (!de->name)
494 return 0;
495
496 if (is_unicode) {
497 __le16 *ufilename = (__le16 *)de->name;
498 if (de->namelen == 2) {
499 /* check for . */
500 if (ufilename[0] == UNICODE_DOT)
501 rc = 1;
502 } else if (de->namelen == 4) {
503 /* check for .. */
504 if (ufilename[0] == UNICODE_DOT &&
505 ufilename[1] == UNICODE_DOT)
506 rc = 2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507 }
Christoph Hellwigcda0ec62011-07-16 15:24:05 -0400508 } else /* ASCII */ {
509 if (de->namelen == 1) {
510 if (de->name[0] == '.')
511 rc = 1;
512 } else if (de->namelen == 2) {
513 if (de->name[0] == '.' && de->name[1] == '.')
514 rc = 2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515 }
516 }
517
518 return rc;
519}
520
Steve Frencheafe8702005-09-15 21:47:30 -0700521/* Check if directory that we are searching has changed so we can decide
522 whether we can use the cached search results from the previous search */
Steve French38702532007-07-08 15:40:40 +0000523static int is_dir_changed(struct file *file)
Steve Frencheafe8702005-09-15 21:47:30 -0700524{
Al Viro496ad9a2013-01-23 17:07:38 -0500525 struct inode *inode = file_inode(file);
Christoph Hellwigc33f8d32007-04-02 18:47:20 +0000526 struct cifsInodeInfo *cifsInfo = CIFS_I(inode);
Steve Frencheafe8702005-09-15 21:47:30 -0700527
Christoph Hellwigc33f8d32007-04-02 18:47:20 +0000528 if (cifsInfo->time == 0)
Steve Frencheafe8702005-09-15 21:47:30 -0700529 return 1; /* directory was changed, perhaps due to unlink */
530 else
531 return 0;
532
533}
534
Steve French0752f152008-10-07 20:03:33 +0000535static int cifs_save_resume_key(const char *current_entry,
Christoph Hellwigeaf35b12011-07-16 15:24:37 -0400536 struct cifsFileInfo *file_info)
Steve French0752f152008-10-07 20:03:33 +0000537{
Christoph Hellwigeaf35b12011-07-16 15:24:37 -0400538 struct cifs_dirent de;
539 int rc;
Steve French0752f152008-10-07 20:03:33 +0000540
Christoph Hellwigeaf35b12011-07-16 15:24:37 -0400541 rc = cifs_fill_dirent(&de, current_entry, file_info->srch_inf.info_level,
542 file_info->srch_inf.unicode);
543 if (!rc) {
544 file_info->srch_inf.presume_name = de.name;
545 file_info->srch_inf.resume_name_len = de.namelen;
546 file_info->srch_inf.resume_key = de.resume_key;
Steve French0752f152008-10-07 20:03:33 +0000547 }
Steve French0752f152008-10-07 20:03:33 +0000548 return rc;
549}
550
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700551/*
552 * Find the corresponding entry in the search. Note that the SMB server returns
553 * search entries for . and .. which complicates logic here if we choose to
554 * parse for them and we do not assume that they are located in the findfirst
555 * return buffer. We start counting in the buffer with entry 2 and increment for
556 * every entry (do not increment for . or .. entry).
557 */
558static int
Al Virobe4ccdc2013-05-22 16:17:25 -0400559find_cifs_entry(const unsigned int xid, struct cifs_tcon *tcon, loff_t pos,
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700560 struct file *file, char **current_entry, int *num_to_ret)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561{
Shirish Pargaonkar2608bee2012-05-15 10:19:16 -0500562 __u16 search_flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563 int rc = 0;
564 int pos_in_buf = 0;
565 loff_t first_entry_in_buffer;
Al Virobe4ccdc2013-05-22 16:17:25 -0400566 loff_t index_to_find = pos;
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700567 struct cifsFileInfo *cfile = file->private_data;
Al Viro7119e222014-10-22 00:25:12 -0400568 struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700569 struct TCP_Server_Info *server = tcon->ses->server;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570 /* check if index in the buffer */
Steve French50c2f752007-07-13 00:33:32 +0000571
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700572 if (!server->ops->query_dir_first || !server->ops->query_dir_next)
573 return -ENOSYS;
574
575 if ((cfile == NULL) || (current_entry == NULL) || (num_to_ret == NULL))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576 return -ENOENT;
Steve French50c2f752007-07-13 00:33:32 +0000577
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700578 *current_entry = NULL;
579 first_entry_in_buffer = cfile->srch_inf.index_of_last_entry -
580 cfile->srch_inf.entries_in_buffer;
Steve French60808232006-04-22 15:53:05 +0000581
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700582 /*
583 * If first entry in buf is zero then is first buffer
584 * in search response data which means it is likely . and ..
585 * will be in this buffer, although some servers do not return
586 * . and .. for the root of a drive and for those we need
587 * to start two entries earlier.
588 */
Steve French60808232006-04-22 15:53:05 +0000589
Steve French39798772006-05-31 22:40:51 +0000590 dump_cifs_file_struct(file, "In fce ");
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700591 if (((index_to_find < cfile->srch_inf.index_of_last_entry) &&
592 is_dir_changed(file)) || (index_to_find < first_entry_in_buffer)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593 /* close and restart search */
Joe Perchesf96637b2013-05-04 22:12:25 -0500594 cifs_dbg(FYI, "search backing up - close and restart search\n");
Jeff Layton44772882010-10-15 15:34:03 -0400595 spin_lock(&cifs_file_list_lock);
Pavel Shilovsky52755802014-08-18 20:49:57 +0400596 if (server->ops->dir_needs_close(cfile)) {
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700597 cfile->invalidHandle = true;
Jeff Layton44772882010-10-15 15:34:03 -0400598 spin_unlock(&cifs_file_list_lock);
Pavel Shilovskyf7369062014-08-26 19:04:44 +0400599 if (server->ops->close_dir)
600 server->ops->close_dir(xid, tcon, &cfile->fid);
Steve Frenchddb4cbf2008-11-20 20:00:44 +0000601 } else
Jeff Layton44772882010-10-15 15:34:03 -0400602 spin_unlock(&cifs_file_list_lock);
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700603 if (cfile->srch_inf.ntwrk_buf_start) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500604 cifs_dbg(FYI, "freeing SMB ff cache buf on search rewind\n");
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700605 if (cfile->srch_inf.smallBuf)
606 cifs_small_buf_release(cfile->srch_inf.
Steve Frenchd47d7c12006-02-28 03:45:48 +0000607 ntwrk_buf_start);
608 else
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700609 cifs_buf_release(cfile->srch_inf.
Steve Frenchd47d7c12006-02-28 03:45:48 +0000610 ntwrk_buf_start);
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700611 cfile->srch_inf.ntwrk_buf_start = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612 }
Steve French38702532007-07-08 15:40:40 +0000613 rc = initiate_cifs_search(xid, file);
Steve French4523cc32007-04-30 20:13:06 +0000614 if (rc) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500615 cifs_dbg(FYI, "error %d reinitiating a search on rewind\n",
Joe Perchesb6b38f72010-04-21 03:50:45 +0000616 rc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617 return rc;
618 }
Jeff Layton70236762011-12-01 20:23:34 -0500619 /* FindFirst/Next set last_entry to NULL on malformed reply */
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700620 if (cfile->srch_inf.last_entry)
621 cifs_save_resume_key(cfile->srch_inf.last_entry, cfile);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622 }
623
Shirish Pargaonkar2608bee2012-05-15 10:19:16 -0500624 search_flags = CIFS_SEARCH_CLOSE_AT_END | CIFS_SEARCH_RETURN_RESUME;
625 if (backup_cred(cifs_sb))
626 search_flags |= CIFS_SEARCH_BACKUP_SEARCH;
627
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700628 while ((index_to_find >= cfile->srch_inf.index_of_last_entry) &&
629 (rc == 0) && !cfile->srch_inf.endOfSearch) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500630 cifs_dbg(FYI, "calling findnext2\n");
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700631 rc = server->ops->query_dir_next(xid, tcon, &cfile->fid,
632 search_flags,
633 &cfile->srch_inf);
Jeff Layton70236762011-12-01 20:23:34 -0500634 /* FindFirst/Next set last_entry to NULL on malformed reply */
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700635 if (cfile->srch_inf.last_entry)
636 cifs_save_resume_key(cfile->srch_inf.last_entry, cfile);
Steve French4523cc32007-04-30 20:13:06 +0000637 if (rc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638 return -ENOENT;
639 }
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700640 if (index_to_find < cfile->srch_inf.index_of_last_entry) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641 /* we found the buffer that contains the entry */
642 /* scan and find it */
643 int i;
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700644 char *cur_ent;
645 char *end_of_smb = cfile->srch_inf.ntwrk_buf_start +
646 server->ops->calc_smb_size(
647 cfile->srch_inf.ntwrk_buf_start);
Steve French60808232006-04-22 15:53:05 +0000648
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700649 cur_ent = cfile->srch_inf.srch_entries_start;
650 first_entry_in_buffer = cfile->srch_inf.index_of_last_entry
651 - cfile->srch_inf.entries_in_buffer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652 pos_in_buf = index_to_find - first_entry_in_buffer;
Joe Perchesf96637b2013-05-04 22:12:25 -0500653 cifs_dbg(FYI, "found entry - pos_in_buf %d\n", pos_in_buf);
Steve French5bafd762006-06-07 00:18:43 +0000654
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700655 for (i = 0; (i < (pos_in_buf)) && (cur_ent != NULL); i++) {
Steve Frenchdfb75332005-06-22 17:13:47 -0700656 /* go entry by entry figuring out which is first */
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700657 cur_ent = nxt_dir_entry(cur_ent, end_of_smb,
658 cfile->srch_inf.info_level);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659 }
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700660 if ((cur_ent == NULL) && (i < pos_in_buf)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661 /* BB fixme - check if we should flag this error */
Joe Perchesf96637b2013-05-04 22:12:25 -0500662 cifs_dbg(VFS, "reached end of buf searching for pos in buf %d index to find %lld rc %d\n",
663 pos_in_buf, index_to_find, rc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664 }
665 rc = 0;
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700666 *current_entry = cur_ent;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667 } else {
Joe Perchesf96637b2013-05-04 22:12:25 -0500668 cifs_dbg(FYI, "index not in buffer - could not findnext into it\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669 return 0;
670 }
671
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700672 if (pos_in_buf >= cfile->srch_inf.entries_in_buffer) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500673 cifs_dbg(FYI, "can not return entries pos_in_buf beyond last\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674 *num_to_ret = 0;
675 } else
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700676 *num_to_ret = cfile->srch_inf.entries_in_buffer - pos_in_buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677
678 return rc;
679}
680
Al Virobe4ccdc2013-05-22 16:17:25 -0400681static int cifs_filldir(char *find_entry, struct file *file,
682 struct dir_context *ctx,
683 char *scratch_buf, unsigned int max_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700684{
Christoph Hellwig9feed6f2011-07-16 15:23:49 -0400685 struct cifsFileInfo *file_info = file->private_data;
Al Viro7119e222014-10-22 00:25:12 -0400686 struct super_block *sb = file_inode(file)->i_sb;
Christoph Hellwig9feed6f2011-07-16 15:23:49 -0400687 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
Christoph Hellwigcda0ec62011-07-16 15:24:05 -0400688 struct cifs_dirent de = { NULL, };
Jeff Laytoncc0bad72009-06-25 00:56:52 -0400689 struct cifs_fattr fattr;
Christoph Hellwig9feed6f2011-07-16 15:23:49 -0400690 struct qstr name;
691 int rc = 0;
Christoph Hellwig9feed6f2011-07-16 15:23:49 -0400692 ino_t ino;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700693
Christoph Hellwigcda0ec62011-07-16 15:24:05 -0400694 rc = cifs_fill_dirent(&de, find_entry, file_info->srch_inf.info_level,
695 file_info->srch_inf.unicode);
Steve French790fe572007-07-07 19:25:05 +0000696 if (rc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697 return rc;
698
Christoph Hellwigf16d59b2011-07-16 15:24:22 -0400699 if (de.namelen > max_len) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500700 cifs_dbg(VFS, "bad search response length %zd past smb end\n",
701 de.namelen);
Christoph Hellwigf16d59b2011-07-16 15:24:22 -0400702 return -EINVAL;
703 }
Jeff Layton132ac7b2009-02-10 07:33:57 -0500704
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705 /* skip . and .. since we added them first */
Christoph Hellwigcda0ec62011-07-16 15:24:05 -0400706 if (cifs_entry_is_dot(&de, file_info->srch_inf.unicode))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707 return 0;
708
Christoph Hellwigf16d59b2011-07-16 15:24:22 -0400709 if (file_info->srch_inf.unicode) {
710 struct nls_table *nlt = cifs_sb->local_nls;
Steve Frenchb6938552014-09-25 13:20:05 -0500711 int map_type;
712
Steve French2baa2682014-09-27 02:19:01 -0500713 map_type = cifs_remap(cifs_sb);
Christoph Hellwigf16d59b2011-07-16 15:24:22 -0400714 name.name = scratch_buf;
715 name.len =
Steve Frenchacbbb762012-01-18 22:32:33 -0600716 cifs_from_utf16((char *)name.name, (__le16 *)de.name,
717 UNICODE_NAME_MAX,
718 min_t(size_t, de.namelen,
Steve Frenchb6938552014-09-25 13:20:05 -0500719 (size_t)max_len), nlt, map_type);
Christoph Hellwigf16d59b2011-07-16 15:24:22 -0400720 name.len -= nls_nullsize(nlt);
721 } else {
722 name.name = de.name;
723 name.len = de.namelen;
724 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725
Christoph Hellwig9feed6f2011-07-16 15:23:49 -0400726 switch (file_info->srch_inf.info_level) {
727 case SMB_FIND_FILE_UNIX:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728 cifs_unix_basic_to_fattr(&fattr,
Christoph Hellwig9feed6f2011-07-16 15:23:49 -0400729 &((FILE_UNIX_INFO *)find_entry)->basic,
730 cifs_sb);
731 break;
732 case SMB_FIND_FILE_INFO_STANDARD:
733 cifs_std_info_to_fattr(&fattr,
734 (FIND_FILE_STANDARD_INFO *)find_entry,
735 cifs_sb);
736 break;
737 default:
738 cifs_dir_info_to_fattr(&fattr,
739 (FILE_DIRECTORY_INFO *)find_entry,
740 cifs_sb);
741 break;
742 }
Steve French38702532007-07-08 15:40:40 +0000743
Christoph Hellwigf16d59b2011-07-16 15:24:22 -0400744 if (de.ino && (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
745 fattr.cf_uniqueid = de.ino;
Jeff Laytonec06aed2009-11-06 14:18:29 -0500746 } else {
Jeff Layton0b8f18e2009-07-09 01:46:37 -0400747 fattr.cf_uniqueid = iunique(sb, ROOT_I);
Jeff Laytonec06aed2009-11-06 14:18:29 -0500748 cifs_autodisable_serverino(cifs_sb);
749 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750
Stefan Metzmacher1b12b9c2010-08-05 21:19:56 +0200751 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) &&
Sachin Prabhucb084b12013-11-25 17:09:50 +0000752 couldbe_mf_symlink(&fattr))
Stefan Metzmacher1b12b9c2010-08-05 21:19:56 +0200753 /*
754 * trying to get the type and mode can be slow,
755 * so just call those regular files for now, and mark
756 * for reval
757 */
758 fattr.cf_flags |= CIFS_FATTR_NEED_REVAL;
759
Al Virob5830432014-10-31 01:22:04 -0400760 cifs_prime_dcache(file->f_path.dentry, &name, &fattr);
Steve French50c2f752007-07-13 00:33:32 +0000761
Jeff Laytoneb1b3fa2012-12-03 06:05:37 -0500762 ino = cifs_uniqueid_to_ino_t(fattr.cf_uniqueid);
Al Virobe4ccdc2013-05-22 16:17:25 -0400763 return !dir_emit(ctx, name.name, name.len, ino, fattr.cf_dtype);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700764}
765
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766
Al Virobe4ccdc2013-05-22 16:17:25 -0400767int cifs_readdir(struct file *file, struct dir_context *ctx)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768{
769 int rc = 0;
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400770 unsigned int xid;
771 int i;
Pavel Shilovsky92fc65a2012-09-18 16:20:32 -0700772 struct cifs_tcon *tcon;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773 struct cifsFileInfo *cifsFile = NULL;
Steve French38702532007-07-08 15:40:40 +0000774 char *current_entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700775 int num_to_fill = 0;
Steve French38702532007-07-08 15:40:40 +0000776 char *tmp_buf = NULL;
Steve French50c2f752007-07-13 00:33:32 +0000777 char *end_of_smb;
Jeff Layton18295792009-04-30 20:45:45 -0400778 unsigned int max_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400780 xid = get_xid();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781
Suresh Jayaraman6221ddd2010-10-01 21:23:33 +0530782 /*
783 * Ensure FindFirst doesn't fail before doing filldir() for '.' and
784 * '..'. Otherwise we won't be able to notify VFS in case of failure.
785 */
786 if (file->private_data == NULL) {
787 rc = initiate_cifs_search(xid, file);
Joe Perchesf96637b2013-05-04 22:12:25 -0500788 cifs_dbg(FYI, "initiate cifs search rc %d\n", rc);
Suresh Jayaraman6221ddd2010-10-01 21:23:33 +0530789 if (rc)
790 goto rddir2_exit;
791 }
792
Al Virobe4ccdc2013-05-22 16:17:25 -0400793 if (!dir_emit_dots(file, ctx))
794 goto rddir2_exit;
795
796 /* 1) If search is active,
797 is in current search buffer?
798 if it before then restart search
799 if after then keep searching till find it */
800
Al Virobe4ccdc2013-05-22 16:17:25 -0400801 cifsFile = file->private_data;
802 if (cifsFile->srch_inf.endOfSearch) {
803 if (cifsFile->srch_inf.emptyDir) {
804 cifs_dbg(FYI, "End of search, empty dir\n");
805 rc = 0;
806 goto rddir2_exit;
807 }
808 } /* else {
809 cifsFile->invalidHandle = true;
810 tcon->ses->server->close(xid, tcon, &cifsFile->fid);
811 } */
812
813 tcon = tlink_tcon(cifsFile->tlink);
814 rc = find_cifs_entry(xid, tcon, ctx->pos, file, &current_entry,
815 &num_to_fill);
816 if (rc) {
817 cifs_dbg(FYI, "fce error %d\n", rc);
818 goto rddir2_exit;
819 } else if (current_entry != NULL) {
820 cifs_dbg(FYI, "entry %lld found\n", ctx->pos);
821 } else {
822 cifs_dbg(FYI, "could not find entry\n");
823 goto rddir2_exit;
824 }
825 cifs_dbg(FYI, "loop through %d times filling dir for net buf %p\n",
826 num_to_fill, cifsFile->srch_inf.ntwrk_buf_start);
827 max_len = tcon->ses->server->ops->calc_smb_size(
828 cifsFile->srch_inf.ntwrk_buf_start);
829 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len;
830
831 tmp_buf = kmalloc(UNICODE_NAME_MAX, GFP_KERNEL);
832 if (tmp_buf == NULL) {
833 rc = -ENOMEM;
834 goto rddir2_exit;
835 }
836
837 for (i = 0; i < num_to_fill; i++) {
838 if (current_entry == NULL) {
839 /* evaluate whether this case is an error */
840 cifs_dbg(VFS, "past SMB end, num to fill %d i %d\n",
841 num_to_fill, i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842 break;
843 }
Al Virobe4ccdc2013-05-22 16:17:25 -0400844 /*
845 * if buggy server returns . and .. late do we want to
846 * check for that here?
847 */
848 rc = cifs_filldir(current_entry, file, ctx,
849 tmp_buf, max_len);
Steve French790fe572007-07-07 19:25:05 +0000850 if (rc) {
Al Virobe4ccdc2013-05-22 16:17:25 -0400851 if (rc > 0)
852 rc = 0;
Kulikov Vasiliyf55fdcc2010-07-16 20:15:25 +0400853 break;
854 }
855
Al Virobe4ccdc2013-05-22 16:17:25 -0400856 ctx->pos++;
857 if (ctx->pos ==
858 cifsFile->srch_inf.index_of_last_entry) {
859 cifs_dbg(FYI, "last entry in buf at pos %lld %s\n",
860 ctx->pos, tmp_buf);
861 cifs_save_resume_key(current_entry, cifsFile);
862 break;
863 } else
864 current_entry =
865 nxt_dir_entry(current_entry, end_of_smb,
866 cifsFile->srch_inf.info_level);
867 }
868 kfree(tmp_buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869
870rddir2_exit:
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400871 free_xid(xid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872 return rc;
873}