blob: 56366e9840769dd8a45250ec3a7b65097c979ff9 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * fs/cifs/dir.c
3 *
4 * vfs operations that deal with dentries
Steve French5fdae1f2007-06-05 18:30:44 +00005 *
Steve Frenchc3b2a0c2009-02-20 04:32:45 +00006 * Copyright (C) International Business Machines Corp., 2002,2009
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 * Author(s): Steve French (sfrench@us.ibm.com)
8 *
9 * This library is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU Lesser General Public License as published
11 * by the Free Software Foundation; either version 2.1 of the License, or
12 * (at your option) any later version.
13 *
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
17 * the GNU Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public License
20 * along with this library; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 */
23#include <linux/fs.h>
24#include <linux/stat.h>
25#include <linux/slab.h>
26#include <linux/namei.h>
Jeff Layton3bc303c2009-09-21 06:47:50 -040027#include <linux/mount.h>
Jeff Layton6ca9f3b2010-06-16 13:40:16 -040028#include <linux/file.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include "cifsfs.h"
30#include "cifspdu.h"
31#include "cifsglob.h"
32#include "cifsproto.h"
33#include "cifs_debug.h"
34#include "cifs_fs_sb.h"
Jeff Laytonec71e0e2013-09-05 08:38:11 -040035#include "cifs_unicode.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070036
Steve French99ee4db2007-02-27 05:35:17 +000037static void
Linus Torvalds1da177e2005-04-16 15:20:36 -070038renew_parental_timestamps(struct dentry *direntry)
39{
Steve French5fdae1f2007-06-05 18:30:44 +000040 /* BB check if there is a way to get the kernel to do this or if we
41 really need this */
Linus Torvalds1da177e2005-04-16 15:20:36 -070042 do {
Miklos Szeredia00be0e2016-09-16 12:44:21 +020043 cifs_set_time(direntry, jiffies);
Linus Torvalds1da177e2005-04-16 15:20:36 -070044 direntry = direntry->d_parent;
Steve French5fdae1f2007-06-05 18:30:44 +000045 } while (!IS_ROOT(direntry));
Linus Torvalds1da177e2005-04-16 15:20:36 -070046}
47
Steve French6d3ea7e2012-11-28 22:34:41 -060048char *
49cifs_build_path_to_root(struct smb_vol *vol, struct cifs_sb_info *cifs_sb,
Sachin Prabhu374402a2016-12-15 12:31:19 +053050 struct cifs_tcon *tcon, int add_treename)
Steve French6d3ea7e2012-11-28 22:34:41 -060051{
Jeff Layton839db3d2012-12-10 06:10:45 -050052 int pplen = vol->prepath ? strlen(vol->prepath) + 1 : 0;
Steve French6d3ea7e2012-11-28 22:34:41 -060053 int dfsplen;
54 char *full_path = NULL;
55
56 /* if no prefix path, simply set path to the root of share to "" */
57 if (pplen == 0) {
58 full_path = kzalloc(1, GFP_KERNEL);
59 return full_path;
60 }
61
Sachin Prabhu374402a2016-12-15 12:31:19 +053062 if (add_treename)
Steve French6d3ea7e2012-11-28 22:34:41 -060063 dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1);
64 else
65 dfsplen = 0;
66
67 full_path = kmalloc(dfsplen + pplen + 1, GFP_KERNEL);
68 if (full_path == NULL)
69 return full_path;
70
71 if (dfsplen)
72 strncpy(full_path, tcon->treeName, dfsplen);
Jeff Layton839db3d2012-12-10 06:10:45 -050073 full_path[dfsplen] = CIFS_DIR_SEP(cifs_sb);
74 strncpy(full_path + dfsplen + 1, vol->prepath, pplen);
Steve French6d3ea7e2012-11-28 22:34:41 -060075 convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
76 full_path[dfsplen + pplen] = 0; /* add trailing null */
77 return full_path;
78}
79
Linus Torvalds1da177e2005-04-16 15:20:36 -070080/* Note: caller must free return buffer */
81char *
82build_path_from_dentry(struct dentry *direntry)
83{
Aurelien Aptel268a6352017-02-13 16:14:17 +010084 struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
85 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
86 bool prefix = tcon->Flags & SMB_SHARE_IS_IN_DFS;
87
88 return build_path_from_dentry_optional_prefix(direntry,
89 prefix);
90}
91
92char *
93build_path_from_dentry_optional_prefix(struct dentry *direntry, bool prefix)
94{
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 struct dentry *temp;
Steve French2fe87f02006-09-21 07:02:52 +000096 int namelen;
Steve French646dd532008-05-15 01:50:56 +000097 int dfsplen;
Aurelien Aptela6b50582016-05-25 19:59:09 +020098 int pplen = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 char *full_path;
Steve French88274812006-03-09 22:21:45 +0000100 char dirsep;
Jeff Layton0d424ad2010-09-20 16:01:35 -0700101 struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
Steve French96daf2b2011-05-27 04:34:02 +0000102 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
Al Virodc137bf2011-07-16 23:37:20 -0400103 unsigned seq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104
Steve French646dd532008-05-15 01:50:56 +0000105 dirsep = CIFS_DIR_SEP(cifs_sb);
Aurelien Aptel268a6352017-02-13 16:14:17 +0100106 if (prefix)
Jeff Layton0d424ad2010-09-20 16:01:35 -0700107 dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1);
Steve French646dd532008-05-15 01:50:56 +0000108 else
109 dfsplen = 0;
Aurelien Aptela6b50582016-05-25 19:59:09 +0200110
111 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
112 pplen = cifs_sb->prepath ? strlen(cifs_sb->prepath) + 1 : 0;
113
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114cifs_bp_rename_retry:
Aurelien Aptela6b50582016-05-25 19:59:09 +0200115 namelen = dfsplen + pplen;
Al Virodc137bf2011-07-16 23:37:20 -0400116 seq = read_seqbegin(&rename_lock);
117 rcu_read_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 for (temp = direntry; !IS_ROOT(temp);) {
119 namelen += (1 + temp->d_name.len);
120 temp = temp->d_parent;
Steve French5fdae1f2007-06-05 18:30:44 +0000121 if (temp == NULL) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500122 cifs_dbg(VFS, "corrupt dentry\n");
Al Virodc137bf2011-07-16 23:37:20 -0400123 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 return NULL;
125 }
126 }
Al Virodc137bf2011-07-16 23:37:20 -0400127 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128
129 full_path = kmalloc(namelen+1, GFP_KERNEL);
Steve French5fdae1f2007-06-05 18:30:44 +0000130 if (full_path == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 return full_path;
132 full_path[namelen] = 0; /* trailing null */
Al Virodc137bf2011-07-16 23:37:20 -0400133 rcu_read_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 for (temp = direntry; !IS_ROOT(temp);) {
Al Virodc137bf2011-07-16 23:37:20 -0400135 spin_lock(&temp->d_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 namelen -= 1 + temp->d_name.len;
137 if (namelen < 0) {
Al Virodc137bf2011-07-16 23:37:20 -0400138 spin_unlock(&temp->d_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139 break;
140 } else {
Steve French7f573562005-08-30 11:32:14 -0700141 full_path[namelen] = dirsep;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 strncpy(full_path + namelen + 1, temp->d_name.name,
143 temp->d_name.len);
Joe Perchesf96637b2013-05-04 22:12:25 -0500144 cifs_dbg(FYI, "name: %s\n", full_path + namelen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 }
Al Virodc137bf2011-07-16 23:37:20 -0400146 spin_unlock(&temp->d_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 temp = temp->d_parent;
Steve French5fdae1f2007-06-05 18:30:44 +0000148 if (temp == NULL) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500149 cifs_dbg(VFS, "corrupt dentry\n");
Al Virodc137bf2011-07-16 23:37:20 -0400150 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151 kfree(full_path);
152 return NULL;
153 }
154 }
Al Virodc137bf2011-07-16 23:37:20 -0400155 rcu_read_unlock();
Aurelien Aptela6b50582016-05-25 19:59:09 +0200156 if (namelen != dfsplen + pplen || read_seqretry(&rename_lock, seq)) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500157 cifs_dbg(FYI, "did not end path lookup where expected. namelen=%ddfsplen=%d\n",
158 namelen, dfsplen);
Steve French5fdae1f2007-06-05 18:30:44 +0000159 /* presumably this is only possible if racing with a rename
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 of one of the parent directories (we can not lock the dentries
161 above us to prevent this, but retrying should be harmless) */
162 kfree(full_path);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 goto cifs_bp_rename_retry;
164 }
Steve French2fe87f02006-09-21 07:02:52 +0000165 /* DIR_SEP already set for byte 0 / vs \ but not for
166 subsequent slashes in prepath which currently must
167 be entered the right way - not sure if there is an alternative
168 since the '\' is a valid posix character so we can not switch
169 those safely to '/' if any are found in the middle of the prepath */
170 /* BB test paths to Windows with '/' in the midst of prepath */
Steve French646dd532008-05-15 01:50:56 +0000171
Aurelien Aptela6b50582016-05-25 19:59:09 +0200172 if (pplen) {
173 int i;
174
175 cifs_dbg(FYI, "using cifs_sb prepath <%s>\n", cifs_sb->prepath);
176 memcpy(full_path+dfsplen+1, cifs_sb->prepath, pplen-1);
177 full_path[dfsplen] = '\\';
178 for (i = 0; i < pplen-1; i++)
179 if (full_path[dfsplen+1+i] == '/')
180 full_path[dfsplen+1+i] = CIFS_DIR_SEP(cifs_sb);
181 }
182
Steve French646dd532008-05-15 01:50:56 +0000183 if (dfsplen) {
Jeff Layton0d424ad2010-09-20 16:01:35 -0700184 strncpy(full_path, tcon->treeName, dfsplen);
Steve French646dd532008-05-15 01:50:56 +0000185 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
186 int i;
187 for (i = 0; i < dfsplen; i++) {
188 if (full_path[i] == '\\')
189 full_path[i] = '/';
190 }
191 }
192 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 return full_path;
194}
195
Miklos Szeredid2c12712012-06-05 15:10:23 +0200196/*
197 * Don't allow the separator character in a path component.
198 * The VFS will not allow "/", but "\" is allowed by posix.
199 */
200static int
201check_name(struct dentry *direntry)
202{
203 struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
204 int i;
205
206 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)) {
207 for (i = 0; i < direntry->d_name.len; i++) {
208 if (direntry->d_name.name[i] == '\\') {
Joe Perchesf96637b2013-05-04 22:12:25 -0500209 cifs_dbg(FYI, "Invalid file name\n");
Miklos Szeredid2c12712012-06-05 15:10:23 +0200210 return -EINVAL;
211 }
212 }
213 }
214 return 0;
215}
216
217
Steve French39798772006-05-31 22:40:51 +0000218/* Inode operations in similar order to how they appear in Linux file fs.h */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400220static int
221cifs_do_create(struct inode *inode, struct dentry *direntry, unsigned int xid,
222 struct tcon_link *tlink, unsigned oflags, umode_t mode,
Shirish Pargaonkarf1e32682013-12-11 16:29:53 -0600223 __u32 *oplock, struct cifs_fid *fid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224{
225 int rc = -ENOENT;
Jeff Layton67750fb2008-05-09 22:28:02 +0000226 int create_options = CREATE_NOT_DIR;
Pavel Shilovsky25364132012-09-18 16:20:27 -0700227 int desired_access;
Miklos Szeredid2c12712012-06-05 15:10:23 +0200228 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
229 struct cifs_tcon *tcon = tlink_tcon(tlink);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 char *full_path = NULL;
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000231 FILE_ALL_INFO *buf = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 struct inode *newinode = NULL;
Miklos Szeredid2c12712012-06-05 15:10:23 +0200233 int disposition;
Pavel Shilovsky25364132012-09-18 16:20:27 -0700234 struct TCP_Server_Info *server = tcon->ses->server;
Pavel Shilovsky226730b2013-07-05 12:00:30 +0400235 struct cifs_open_parms oparms;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236
Miklos Szeredid2c12712012-06-05 15:10:23 +0200237 *oplock = 0;
Pavel Shilovsky10b9b982012-03-20 12:55:09 +0300238 if (tcon->ses->server->oplocks)
Miklos Szeredid2c12712012-06-05 15:10:23 +0200239 *oplock = REQ_OPLOCK;
Steve Frenchc3b2a0c2009-02-20 04:32:45 +0000240
Jeff Layton7ffec372010-09-29 19:51:11 -0400241 full_path = build_path_from_dentry(direntry);
242 if (full_path == NULL) {
243 rc = -ENOMEM;
Miklos Szeredid2c12712012-06-05 15:10:23 +0200244 goto out;
Jeff Layton7ffec372010-09-29 19:51:11 -0400245 }
246
Pavel Shilovsky29e20f92012-07-13 13:58:14 +0400247 if (tcon->unix_ext && cap_unix(tcon->ses) && !tcon->broken_posix_open &&
Steve Frenchc3b2a0c2009-02-20 04:32:45 +0000248 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
249 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
Pavel Shilovsky25364132012-09-18 16:20:27 -0700250 rc = cifs_posix_open(full_path, &newinode, inode->i_sb, mode,
251 oflags, oplock, &fid->netfid, xid);
Miklos Szeredid2c12712012-06-05 15:10:23 +0200252 switch (rc) {
253 case 0:
254 if (newinode == NULL) {
255 /* query inode info */
Steve French90e4ee52009-05-08 03:04:30 +0000256 goto cifs_create_get_file_info;
Miklos Szeredid2c12712012-06-05 15:10:23 +0200257 }
258
Sachin Prabhu8d9535b2016-07-07 21:28:27 +0100259 if (S_ISDIR(newinode->i_mode)) {
260 CIFSSMBClose(xid, tcon, fid->netfid);
261 iput(newinode);
262 rc = -EISDIR;
263 goto out;
264 }
265
Miklos Szeredid2c12712012-06-05 15:10:23 +0200266 if (!S_ISREG(newinode->i_mode)) {
267 /*
268 * The server may allow us to open things like
269 * FIFOs, but the client isn't set up to deal
270 * with that. If it's not a regular file, just
271 * close it and proceed as if it were a normal
272 * lookup.
273 */
Pavel Shilovsky25364132012-09-18 16:20:27 -0700274 CIFSSMBClose(xid, tcon, fid->netfid);
Miklos Szeredid2c12712012-06-05 15:10:23 +0200275 goto cifs_create_get_file_info;
276 }
277 /* success, no need to query */
278 goto cifs_create_set_dentry;
279
280 case -ENOENT:
281 goto cifs_create_get_file_info;
282
283 case -EIO:
284 case -EINVAL:
285 /*
286 * EIO could indicate that (posix open) operation is not
287 * supported, despite what server claimed in capability
288 * negotiation.
289 *
290 * POSIX open in samba versions 3.3.1 and earlier could
291 * incorrectly fail with invalid parameter.
292 */
293 tcon->broken_posix_open = true;
294 break;
295
296 case -EREMOTE:
297 case -EOPNOTSUPP:
298 /*
299 * EREMOTE indicates DFS junction, which is not handled
300 * in posix open. If either that or op not supported
301 * returned, follow the normal lookup.
302 */
303 break;
304
305 default:
306 goto out;
307 }
308 /*
309 * fallthrough to retry, using older open call, this is case
310 * where server does not support this SMB level, and falsely
311 * claims capability (also get here for DFS case which should be
312 * rare for path not covered on files)
313 */
Steve Frenchc3b2a0c2009-02-20 04:32:45 +0000314 }
Steve Frenchf818dd52009-01-19 02:38:35 +0000315
Pavel Shilovsky25364132012-09-18 16:20:27 -0700316 desired_access = 0;
Miklos Szeredid2c12712012-06-05 15:10:23 +0200317 if (OPEN_FMODE(oflags) & FMODE_READ)
Pavel Shilovsky25364132012-09-18 16:20:27 -0700318 desired_access |= GENERIC_READ; /* is this too little? */
Miklos Szeredid2c12712012-06-05 15:10:23 +0200319 if (OPEN_FMODE(oflags) & FMODE_WRITE)
Pavel Shilovsky25364132012-09-18 16:20:27 -0700320 desired_access |= GENERIC_WRITE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321
Miklos Szeredid2c12712012-06-05 15:10:23 +0200322 disposition = FILE_OVERWRITE_IF;
323 if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
324 disposition = FILE_CREATE;
325 else if ((oflags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
326 disposition = FILE_OVERWRITE_IF;
327 else if ((oflags & O_CREAT) == O_CREAT)
328 disposition = FILE_OPEN_IF;
329 else
Joe Perchesf96637b2013-05-04 22:12:25 -0500330 cifs_dbg(FYI, "Create flag not set in create function\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331
Pavel Shilovsky25364132012-09-18 16:20:27 -0700332 /*
333 * BB add processing to set equivalent of mode - e.g. via CreateX with
334 * ACLs
335 */
336
337 if (!server->ops->open) {
338 rc = -ENOSYS;
339 goto out;
340 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341
Steve French5fdae1f2007-06-05 18:30:44 +0000342 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
343 if (buf == NULL) {
Jeff Layton232341b2010-08-05 13:58:38 -0400344 rc = -ENOMEM;
Miklos Szeredid2c12712012-06-05 15:10:23 +0200345 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 }
Jeff Layton67750fb2008-05-09 22:28:02 +0000347
Jeff Layton67750fb2008-05-09 22:28:02 +0000348 /*
349 * if we're not using unix extensions, see if we need to set
350 * ATTR_READONLY on the create call
351 */
Steve Frenchf818dd52009-01-19 02:38:35 +0000352 if (!tcon->unix_ext && (mode & S_IWUGO) == 0)
Jeff Layton67750fb2008-05-09 22:28:02 +0000353 create_options |= CREATE_OPTION_READONLY;
354
Shirish Pargaonkar3d3ea8e2011-09-26 09:56:44 -0500355 if (backup_cred(cifs_sb))
356 create_options |= CREATE_OPEN_BACKUP_INTENT;
357
Pavel Shilovsky226730b2013-07-05 12:00:30 +0400358 oparms.tcon = tcon;
359 oparms.cifs_sb = cifs_sb;
360 oparms.desired_access = desired_access;
361 oparms.create_options = create_options;
362 oparms.disposition = disposition;
363 oparms.path = full_path;
364 oparms.fid = fid;
Pavel Shilovsky9cbc0b72013-07-09 18:40:58 +0400365 oparms.reconnect = false;
Pavel Shilovsky226730b2013-07-05 12:00:30 +0400366
367 rc = server->ops->open(xid, &oparms, oplock, buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368 if (rc) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500369 cifs_dbg(FYI, "cifs_create returned 0x%x\n", rc);
Miklos Szeredid2c12712012-06-05 15:10:23 +0200370 goto out;
Steve Frenchc3b2a0c2009-02-20 04:32:45 +0000371 }
372
Pavel Shilovsky25364132012-09-18 16:20:27 -0700373 /*
374 * If Open reported that we actually created a file then we now have to
375 * set the mode if possible.
376 */
Miklos Szeredid2c12712012-06-05 15:10:23 +0200377 if ((tcon->unix_ext) && (*oplock & CIFS_CREATE_ACTION)) {
Steve Frenchc3b2a0c2009-02-20 04:32:45 +0000378 struct cifs_unix_set_info_args args = {
Jeff Layton4e1e7fb2008-08-02 07:26:12 -0400379 .mode = mode,
380 .ctime = NO_CHANGE_64,
381 .atime = NO_CHANGE_64,
382 .mtime = NO_CHANGE_64,
383 .device = 0,
Steve Frenchc3b2a0c2009-02-20 04:32:45 +0000384 };
Jeff Layton4e1e7fb2008-08-02 07:26:12 -0400385
Steve Frenchc3b2a0c2009-02-20 04:32:45 +0000386 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
Eric W. Biederman49418b22013-02-06 00:57:56 -0800387 args.uid = current_fsuid();
Steve Frenchc3b2a0c2009-02-20 04:32:45 +0000388 if (inode->i_mode & S_ISGID)
Eric W. Biederman49418b22013-02-06 00:57:56 -0800389 args.gid = inode->i_gid;
Steve Frenchc3b2a0c2009-02-20 04:32:45 +0000390 else
Eric W. Biederman49418b22013-02-06 00:57:56 -0800391 args.gid = current_fsgid();
Steve French3ce53fc2007-06-08 14:55:14 +0000392 } else {
Eric W. Biederman49418b22013-02-06 00:57:56 -0800393 args.uid = INVALID_UID; /* no change */
394 args.gid = INVALID_GID; /* no change */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395 }
Pavel Shilovsky25364132012-09-18 16:20:27 -0700396 CIFSSMBUnixSetFileInfo(xid, tcon, &args, fid->netfid,
397 current->tgid);
Steve Frenchc3b2a0c2009-02-20 04:32:45 +0000398 } else {
Pavel Shilovsky25364132012-09-18 16:20:27 -0700399 /*
400 * BB implement mode setting via Windows security
401 * descriptors e.g.
402 */
Steve Frenchc3b2a0c2009-02-20 04:32:45 +0000403 /* CIFSSMBWinSetPerms(xid,tcon,path,mode,-1,-1,nls);*/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404
Steve Frenchc3b2a0c2009-02-20 04:32:45 +0000405 /* Could set r/o dos attribute if mode & 0222 == 0 */
406 }
407
408cifs_create_get_file_info:
409 /* server might mask mode so we have to query for it */
410 if (tcon->unix_ext)
Pavel Shilovsky25364132012-09-18 16:20:27 -0700411 rc = cifs_get_inode_info_unix(&newinode, full_path, inode->i_sb,
412 xid);
Steve Frenchc3b2a0c2009-02-20 04:32:45 +0000413 else {
Pavel Shilovsky25364132012-09-18 16:20:27 -0700414 rc = cifs_get_inode_info(&newinode, full_path, buf, inode->i_sb,
Steve French42eacf92014-02-10 14:08:16 -0600415 xid, fid);
Steve Frenchc3b2a0c2009-02-20 04:32:45 +0000416 if (newinode) {
Pavel Shilovskyb8c32db2012-09-19 06:22:44 -0700417 if (server->ops->set_lease_key)
418 server->ops->set_lease_key(newinode, fid);
Steve Frenchc3b2a0c2009-02-20 04:32:45 +0000419 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
420 newinode->i_mode = mode;
Miklos Szeredid2c12712012-06-05 15:10:23 +0200421 if ((*oplock & CIFS_CREATE_ACTION) &&
Steve Frenchc3b2a0c2009-02-20 04:32:45 +0000422 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)) {
423 newinode->i_uid = current_fsuid();
424 if (inode->i_mode & S_ISGID)
425 newinode->i_gid = inode->i_gid;
426 else
427 newinode->i_gid = current_fsgid();
Steve French6473a552005-11-29 20:20:10 -0800428 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429 }
Steve Frenchc3b2a0c2009-02-20 04:32:45 +0000430 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431
Steve Frenchc3b2a0c2009-02-20 04:32:45 +0000432cifs_create_set_dentry:
Miklos Szeredid2c12712012-06-05 15:10:23 +0200433 if (rc != 0) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500434 cifs_dbg(FYI, "Create worked, get_inode_info failed rc = %d\n",
435 rc);
Sachin Prabhu8d9535b2016-07-07 21:28:27 +0100436 goto out_err;
Steve French5fdae1f2007-06-05 18:30:44 +0000437 }
Sachin Prabhu8d9535b2016-07-07 21:28:27 +0100438
439 if (S_ISDIR(newinode->i_mode)) {
440 rc = -EISDIR;
441 goto out_err;
442 }
443
Miklos Szeredid2c12712012-06-05 15:10:23 +0200444 d_drop(direntry);
445 d_add(direntry, newinode);
Jeff Layton2422f672010-06-16 13:40:16 -0400446
Miklos Szeredid2c12712012-06-05 15:10:23 +0200447out:
Steve Frenchd14537f12005-04-28 22:41:05 -0700448 kfree(buf);
449 kfree(full_path);
Miklos Szeredid2c12712012-06-05 15:10:23 +0200450 return rc;
Sachin Prabhu8d9535b2016-07-07 21:28:27 +0100451
452out_err:
453 if (server->ops->close)
454 server->ops->close(xid, tcon, fid);
455 if (newinode)
456 iput(newinode);
457 goto out;
Miklos Szeredid2c12712012-06-05 15:10:23 +0200458}
459
Al Virod9585272012-06-22 12:39:14 +0400460int
Miklos Szeredid2c12712012-06-05 15:10:23 +0200461cifs_atomic_open(struct inode *inode, struct dentry *direntry,
Al Viro30d904942012-06-22 12:40:19 +0400462 struct file *file, unsigned oflags, umode_t mode,
Al Viro47237682012-06-10 05:01:45 -0400463 int *opened)
Miklos Szeredid2c12712012-06-05 15:10:23 +0200464{
465 int rc;
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400466 unsigned int xid;
Miklos Szeredid2c12712012-06-05 15:10:23 +0200467 struct tcon_link *tlink;
468 struct cifs_tcon *tcon;
Pavel Shilovsky25364132012-09-18 16:20:27 -0700469 struct TCP_Server_Info *server;
Pavel Shilovskyfb1214e2012-09-18 16:20:26 -0700470 struct cifs_fid fid;
Pavel Shilovsky233839b2012-09-19 06:22:45 -0700471 struct cifs_pending_open open;
Miklos Szeredid2c12712012-06-05 15:10:23 +0200472 __u32 oplock;
Pavel Shilovskyfb1214e2012-09-18 16:20:26 -0700473 struct cifsFileInfo *file_info;
Miklos Szeredid2c12712012-06-05 15:10:23 +0200474
Pavel Shilovskyfb1214e2012-09-18 16:20:26 -0700475 /*
476 * Posix open is only called (at lookup time) for file create now. For
Miklos Szeredid2c12712012-06-05 15:10:23 +0200477 * opens (rather than creates), because we do not know if it is a file
478 * or directory yet, and current Samba no longer allows us to do posix
479 * open on dirs, we could end up wasting an open call on what turns out
480 * to be a dir. For file opens, we wait to call posix open till
481 * cifs_open. It could be added to atomic_open in the future but the
482 * performance tradeoff of the extra network request when EISDIR or
483 * EACCES is returned would have to be weighed against the 50% reduction
484 * in network traffic in the other paths.
485 */
486 if (!(oflags & O_CREAT)) {
Sachin Prabhu3798f47a2012-11-05 11:39:32 +0000487 struct dentry *res;
488
489 /*
490 * Check for hashed negative dentry. We have already revalidated
491 * the dentry and it is fine. No need to perform another lookup.
492 */
Al Viro00699ad2016-07-05 09:44:53 -0400493 if (!d_in_lookup(direntry))
Sachin Prabhu3798f47a2012-11-05 11:39:32 +0000494 return -ENOENT;
495
496 res = cifs_lookup(inode, direntry, 0);
Miklos Szeredid2c12712012-06-05 15:10:23 +0200497 if (IS_ERR(res))
Al Virod9585272012-06-22 12:39:14 +0400498 return PTR_ERR(res);
Miklos Szeredid2c12712012-06-05 15:10:23 +0200499
Al Viroe45198a2012-06-10 06:48:09 -0400500 return finish_no_open(file, res);
Miklos Szeredid2c12712012-06-05 15:10:23 +0200501 }
502
503 rc = check_name(direntry);
504 if (rc)
Al Virod9585272012-06-22 12:39:14 +0400505 return rc;
Miklos Szeredid2c12712012-06-05 15:10:23 +0200506
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400507 xid = get_xid();
Miklos Szeredid2c12712012-06-05 15:10:23 +0200508
Al Viro35c265e2014-08-19 20:25:34 -0400509 cifs_dbg(FYI, "parent inode = 0x%p name is: %pd and dentry = 0x%p\n",
510 inode, direntry, direntry);
Miklos Szeredid2c12712012-06-05 15:10:23 +0200511
512 tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb));
Wei Yongjunefb79f22013-04-04 14:16:21 +0800513 if (IS_ERR(tlink)) {
514 rc = PTR_ERR(tlink);
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400515 goto out_free_xid;
Wei Yongjunefb79f22013-04-04 14:16:21 +0800516 }
Miklos Szeredid2c12712012-06-05 15:10:23 +0200517
518 tcon = tlink_tcon(tlink);
Pavel Shilovsky25364132012-09-18 16:20:27 -0700519 server = tcon->ses->server;
Miklos Szeredid2c12712012-06-05 15:10:23 +0200520
Pavel Shilovskyb8c32db2012-09-19 06:22:44 -0700521 if (server->ops->new_lease_key)
522 server->ops->new_lease_key(&fid);
523
Pavel Shilovsky233839b2012-09-19 06:22:45 -0700524 cifs_add_pending_open(&fid, tlink, &open);
525
Miklos Szeredid2c12712012-06-05 15:10:23 +0200526 rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode,
Shirish Pargaonkarf1e32682013-12-11 16:29:53 -0600527 &oplock, &fid);
Miklos Szeredid2c12712012-06-05 15:10:23 +0200528
Pavel Shilovsky233839b2012-09-19 06:22:45 -0700529 if (rc) {
530 cifs_del_pending_open(&open);
Miklos Szeredid2c12712012-06-05 15:10:23 +0200531 goto out;
Pavel Shilovsky233839b2012-09-19 06:22:45 -0700532 }
Miklos Szeredid2c12712012-06-05 15:10:23 +0200533
Shirish Pargaonkarf1e32682013-12-11 16:29:53 -0600534 if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
535 *opened |= FILE_CREATED;
536
Al Viro30d904942012-06-22 12:40:19 +0400537 rc = finish_open(file, direntry, generic_file_open, opened);
538 if (rc) {
Pavel Shilovsky25364132012-09-18 16:20:27 -0700539 if (server->ops->close)
540 server->ops->close(xid, tcon, &fid);
Pavel Shilovsky233839b2012-09-19 06:22:45 -0700541 cifs_del_pending_open(&open);
Miklos Szeredid2c12712012-06-05 15:10:23 +0200542 goto out;
543 }
544
Namjae Jeon787aded2014-08-22 14:22:51 +0900545 if (file->f_flags & O_DIRECT &&
546 CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) {
547 if (CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
548 file->f_op = &cifs_file_direct_nobrl_ops;
549 else
550 file->f_op = &cifs_file_direct_ops;
551 }
552
Pavel Shilovskyfb1214e2012-09-18 16:20:26 -0700553 file_info = cifs_new_fileinfo(&fid, file, tlink, oplock);
554 if (file_info == NULL) {
Pavel Shilovsky25364132012-09-18 16:20:27 -0700555 if (server->ops->close)
556 server->ops->close(xid, tcon, &fid);
Pavel Shilovsky233839b2012-09-19 06:22:45 -0700557 cifs_del_pending_open(&open);
Miklos Szeredidfb1d612013-09-16 14:51:59 +0200558 fput(file);
Al Virod9585272012-06-22 12:39:14 +0400559 rc = -ENOMEM;
Miklos Szeredid2c12712012-06-05 15:10:23 +0200560 }
561
562out:
Jeff Layton7ffec372010-09-29 19:51:11 -0400563 cifs_put_tlink(tlink);
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400564out_free_xid:
565 free_xid(xid);
Al Virod9585272012-06-22 12:39:14 +0400566 return rc;
Miklos Szeredid2c12712012-06-05 15:10:23 +0200567}
568
569int cifs_create(struct inode *inode, struct dentry *direntry, umode_t mode,
Al Viroebfc3b42012-06-10 18:05:36 -0400570 bool excl)
Miklos Szeredid2c12712012-06-05 15:10:23 +0200571{
572 int rc;
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400573 unsigned int xid = get_xid();
Miklos Szeredid2c12712012-06-05 15:10:23 +0200574 /*
575 * BB below access is probably too much for mknod to request
576 * but we have to do query and setpathinfo so requesting
577 * less could fail (unless we want to request getatr and setatr
578 * permissions (only). At least for POSIX we do not have to
579 * request so much.
580 */
581 unsigned oflags = O_EXCL | O_CREAT | O_RDWR;
582 struct tcon_link *tlink;
Pavel Shilovsky25364132012-09-18 16:20:27 -0700583 struct cifs_tcon *tcon;
584 struct TCP_Server_Info *server;
585 struct cifs_fid fid;
Miklos Szeredid2c12712012-06-05 15:10:23 +0200586 __u32 oplock;
Miklos Szeredid2c12712012-06-05 15:10:23 +0200587
Al Viro35c265e2014-08-19 20:25:34 -0400588 cifs_dbg(FYI, "cifs_create parent inode = 0x%p name is: %pd and dentry = 0x%p\n",
589 inode, direntry, direntry);
Miklos Szeredid2c12712012-06-05 15:10:23 +0200590
591 tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb));
592 rc = PTR_ERR(tlink);
593 if (IS_ERR(tlink))
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400594 goto out_free_xid;
Miklos Szeredid2c12712012-06-05 15:10:23 +0200595
Pavel Shilovsky25364132012-09-18 16:20:27 -0700596 tcon = tlink_tcon(tlink);
597 server = tcon->ses->server;
Pavel Shilovskyb8c32db2012-09-19 06:22:44 -0700598
599 if (server->ops->new_lease_key)
600 server->ops->new_lease_key(&fid);
601
602 rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode,
Shirish Pargaonkarf1e32682013-12-11 16:29:53 -0600603 &oplock, &fid);
Pavel Shilovsky25364132012-09-18 16:20:27 -0700604 if (!rc && server->ops->close)
605 server->ops->close(xid, tcon, &fid);
Miklos Szeredid2c12712012-06-05 15:10:23 +0200606
607 cifs_put_tlink(tlink);
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400608out_free_xid:
609 free_xid(xid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610 return rc;
611}
612
Al Viro1a67aaf2011-07-26 01:52:52 -0400613int cifs_mknod(struct inode *inode, struct dentry *direntry, umode_t mode,
Steve French5fdae1f2007-06-05 18:30:44 +0000614 dev_t device_number)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615{
616 int rc = -EPERM;
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400617 unsigned int xid;
Shirish Pargaonkar3d3ea8e2011-09-26 09:56:44 -0500618 int create_options = CREATE_NOT_DIR | CREATE_OPTION_SPECIAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619 struct cifs_sb_info *cifs_sb;
Jeff Layton7ffec372010-09-29 19:51:11 -0400620 struct tcon_link *tlink;
Pavel Shilovskydd120672014-01-16 15:53:34 +0400621 struct cifs_tcon *tcon;
Pavel Shilovskyfa2989f2011-05-26 10:01:59 +0400622 struct cifs_io_parms io_parms;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623 char *full_path = NULL;
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000624 struct inode *newinode = NULL;
Steve Frenchdb8b6312014-09-22 05:13:55 -0500625 __u32 oplock = 0;
Pavel Shilovskyd81b8a42014-01-16 15:53:36 +0400626 struct cifs_fid fid;
627 struct cifs_open_parms oparms;
Jeff Layton5d9ac7f2010-08-05 13:58:22 -0400628 FILE_ALL_INFO *buf = NULL;
629 unsigned int bytes_written;
630 struct win_dev *pdev;
Steve Frenchdb8b6312014-09-22 05:13:55 -0500631 struct kvec iov[2];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632
633 if (!old_valid_dev(device_number))
634 return -EINVAL;
635
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636 cifs_sb = CIFS_SB(inode->i_sb);
Jeff Layton7ffec372010-09-29 19:51:11 -0400637 tlink = cifs_sb_tlink(cifs_sb);
638 if (IS_ERR(tlink))
639 return PTR_ERR(tlink);
640
Pavel Shilovskydd120672014-01-16 15:53:34 +0400641 tcon = tlink_tcon(tlink);
Jeff Layton7ffec372010-09-29 19:51:11 -0400642
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400643 xid = get_xid();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645 full_path = build_path_from_dentry(direntry);
Jeff Layton5d9ac7f2010-08-05 13:58:22 -0400646 if (full_path == NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647 rc = -ENOMEM;
Jeff Layton5d9ac7f2010-08-05 13:58:22 -0400648 goto mknod_out;
649 }
650
Pavel Shilovskydd120672014-01-16 15:53:34 +0400651 if (tcon->unix_ext) {
Jeff Layton4e1e7fb2008-08-02 07:26:12 -0400652 struct cifs_unix_set_info_args args = {
Al Viroce3b0f82009-03-29 19:08:22 -0400653 .mode = mode & ~current_umask(),
Jeff Layton4e1e7fb2008-08-02 07:26:12 -0400654 .ctime = NO_CHANGE_64,
655 .atime = NO_CHANGE_64,
656 .mtime = NO_CHANGE_64,
657 .device = device_number,
658 };
Steve French5fdae1f2007-06-05 18:30:44 +0000659 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
Eric W. Biederman49418b22013-02-06 00:57:56 -0800660 args.uid = current_fsuid();
661 args.gid = current_fsgid();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662 } else {
Eric W. Biederman49418b22013-02-06 00:57:56 -0800663 args.uid = INVALID_UID; /* no change */
664 args.gid = INVALID_GID; /* no change */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665 }
Pavel Shilovskydd120672014-01-16 15:53:34 +0400666 rc = CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args,
Jeff Layton01ea95e2009-07-09 20:02:49 -0400667 cifs_sb->local_nls,
Nakajima Akirabc8ebdc42015-02-13 15:35:58 +0900668 cifs_remap(cifs_sb));
Jeff Layton5d9ac7f2010-08-05 13:58:22 -0400669 if (rc)
670 goto mknod_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671
Jeff Layton5d9ac7f2010-08-05 13:58:22 -0400672 rc = cifs_get_inode_info_unix(&newinode, full_path,
Steve French5fdae1f2007-06-05 18:30:44 +0000673 inode->i_sb, xid);
Steve Frenchd7245c22005-07-14 18:25:12 -0500674
Jeff Layton5d9ac7f2010-08-05 13:58:22 -0400675 if (rc == 0)
676 d_instantiate(direntry, newinode);
677 goto mknod_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678 }
679
Jeff Layton5d9ac7f2010-08-05 13:58:22 -0400680 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL))
681 goto mknod_out;
682
683
Joe Perchesf96637b2013-05-04 22:12:25 -0500684 cifs_dbg(FYI, "sfu compat create special file\n");
Jeff Layton5d9ac7f2010-08-05 13:58:22 -0400685
686 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
687 if (buf == NULL) {
688 kfree(full_path);
689 rc = -ENOMEM;
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400690 free_xid(xid);
Jeff Layton5d9ac7f2010-08-05 13:58:22 -0400691 return rc;
692 }
693
Shirish Pargaonkar3d3ea8e2011-09-26 09:56:44 -0500694 if (backup_cred(cifs_sb))
695 create_options |= CREATE_OPEN_BACKUP_INTENT;
696
Pavel Shilovskyd81b8a42014-01-16 15:53:36 +0400697 oparms.tcon = tcon;
698 oparms.cifs_sb = cifs_sb;
699 oparms.desired_access = GENERIC_WRITE;
700 oparms.create_options = create_options;
701 oparms.disposition = FILE_CREATE;
702 oparms.path = full_path;
703 oparms.fid = &fid;
704 oparms.reconnect = false;
705
Steve Frenchdb8b6312014-09-22 05:13:55 -0500706 if (tcon->ses->server->oplocks)
707 oplock = REQ_OPLOCK;
708 else
709 oplock = 0;
710 rc = tcon->ses->server->ops->open(xid, &oparms, &oplock, buf);
Jeff Layton5d9ac7f2010-08-05 13:58:22 -0400711 if (rc)
712 goto mknod_out;
713
Pavel Shilovskydd120672014-01-16 15:53:34 +0400714 /*
715 * BB Do not bother to decode buf since no local inode yet to put
716 * timestamps in, but we can reuse it safely.
717 */
Jeff Layton5d9ac7f2010-08-05 13:58:22 -0400718
719 pdev = (struct win_dev *)buf;
Pavel Shilovskyfa2989f2011-05-26 10:01:59 +0400720 io_parms.pid = current->tgid;
Pavel Shilovskydd120672014-01-16 15:53:34 +0400721 io_parms.tcon = tcon;
Pavel Shilovskyfa2989f2011-05-26 10:01:59 +0400722 io_parms.offset = 0;
723 io_parms.length = sizeof(struct win_dev);
Steve Frenchdb8b6312014-09-22 05:13:55 -0500724 iov[1].iov_base = buf;
725 iov[1].iov_len = sizeof(struct win_dev);
Jeff Layton5d9ac7f2010-08-05 13:58:22 -0400726 if (S_ISCHR(mode)) {
727 memcpy(pdev->type, "IntxCHR", 8);
Pavel Shilovskydd120672014-01-16 15:53:34 +0400728 pdev->major = cpu_to_le64(MAJOR(device_number));
729 pdev->minor = cpu_to_le64(MINOR(device_number));
Steve Frenchdb8b6312014-09-22 05:13:55 -0500730 rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms,
731 &bytes_written, iov, 1);
Jeff Layton5d9ac7f2010-08-05 13:58:22 -0400732 } else if (S_ISBLK(mode)) {
733 memcpy(pdev->type, "IntxBLK", 8);
Pavel Shilovskydd120672014-01-16 15:53:34 +0400734 pdev->major = cpu_to_le64(MAJOR(device_number));
735 pdev->minor = cpu_to_le64(MINOR(device_number));
Steve Frenchdb8b6312014-09-22 05:13:55 -0500736 rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms,
737 &bytes_written, iov, 1);
Jeff Layton5d9ac7f2010-08-05 13:58:22 -0400738 } /* else if (S_ISFIFO) */
Steve Frenchdb8b6312014-09-22 05:13:55 -0500739 tcon->ses->server->ops->close(xid, tcon, &fid);
Jeff Layton5d9ac7f2010-08-05 13:58:22 -0400740 d_drop(direntry);
741
742 /* FIXME: add code here to set EAs */
743
744mknod_out:
Steve Frenchd14537f12005-04-28 22:41:05 -0700745 kfree(full_path);
Jeff Layton5d9ac7f2010-08-05 13:58:22 -0400746 kfree(buf);
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400747 free_xid(xid);
Jeff Layton7ffec372010-09-29 19:51:11 -0400748 cifs_put_tlink(tlink);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749 return rc;
750}
751
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752struct dentry *
Steve French5fdae1f2007-06-05 18:30:44 +0000753cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
Al Viro00cd8dd2012-06-10 17:13:09 -0400754 unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755{
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400756 unsigned int xid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700757 int rc = 0; /* to get around spurious gcc warning, set to zero here */
758 struct cifs_sb_info *cifs_sb;
Jeff Layton7ffec372010-09-29 19:51:11 -0400759 struct tcon_link *tlink;
Steve French96daf2b2011-05-27 04:34:02 +0000760 struct cifs_tcon *pTcon;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761 struct inode *newInode = NULL;
762 char *full_path = NULL;
763
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400764 xid = get_xid();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765
Al Viro35c265e2014-08-19 20:25:34 -0400766 cifs_dbg(FYI, "parent inode = 0x%p name is: %pd and dentry = 0x%p\n",
767 parent_dir_inode, direntry, direntry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769 /* check whether path exists */
770
771 cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
Jeff Layton7ffec372010-09-29 19:51:11 -0400772 tlink = cifs_sb_tlink(cifs_sb);
773 if (IS_ERR(tlink)) {
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400774 free_xid(xid);
Jeff Layton7ffec372010-09-29 19:51:11 -0400775 return (struct dentry *)tlink;
776 }
777 pTcon = tlink_tcon(tlink);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700778
Miklos Szeredid2c12712012-06-05 15:10:23 +0200779 rc = check_name(direntry);
780 if (rc)
Jeff Layton7ffec372010-09-29 19:51:11 -0400781 goto lookup_out;
Jeff Layton5ddf1e02009-07-05 11:01:02 -0400782
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783 /* can not grab the rename sem here since it would
784 deadlock in the cases (beginning of sys_rename itself)
785 in which we already have the sb rename sem */
786 full_path = build_path_from_dentry(direntry);
Steve French5fdae1f2007-06-05 18:30:44 +0000787 if (full_path == NULL) {
Jeff Layton7ffec372010-09-29 19:51:11 -0400788 rc = -ENOMEM;
789 goto lookup_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790 }
791
David Howells2b0143b2015-03-17 22:25:59 +0000792 if (d_really_is_positive(direntry)) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500793 cifs_dbg(FYI, "non-NULL inode in lookup\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700794 } else {
Joe Perchesf96637b2013-05-04 22:12:25 -0500795 cifs_dbg(FYI, "NULL inode in lookup\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796 }
Joe Perchesf96637b2013-05-04 22:12:25 -0500797 cifs_dbg(FYI, "Full path: %s inode = 0x%p\n",
David Howells2b0143b2015-03-17 22:25:59 +0000798 full_path, d_inode(direntry));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700799
Steve Frencha6ce4932009-04-09 01:14:32 +0000800 if (pTcon->unix_ext) {
Miklos Szeredid2c12712012-06-05 15:10:23 +0200801 rc = cifs_get_inode_info_unix(&newInode, full_path,
802 parent_dir_inode->i_sb, xid);
803 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700804 rc = cifs_get_inode_info(&newInode, full_path, NULL,
Steve Frencha6ce4932009-04-09 01:14:32 +0000805 parent_dir_inode->i_sb, xid, NULL);
Miklos Szeredid2c12712012-06-05 15:10:23 +0200806 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807
808 if ((rc == 0) && (newInode != NULL)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809 d_add(direntry, newInode);
Steve French5fdae1f2007-06-05 18:30:44 +0000810 /* since paths are not looked up by component - the parent
Steve French3abb9272005-11-28 08:16:13 -0800811 directories are presumed to be good here */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700812 renew_parental_timestamps(direntry);
813
814 } else if (rc == -ENOENT) {
815 rc = 0;
Miklos Szeredia00be0e2016-09-16 12:44:21 +0200816 cifs_set_time(direntry, jiffies);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817 d_add(direntry, NULL);
Steve French5fdae1f2007-06-05 18:30:44 +0000818 /* if it was once a directory (but how can we tell?) we could do
819 shrink_dcache_parent(direntry); */
Steve Frenched2b9172008-01-20 00:30:29 +0000820 } else if (rc != -EACCES) {
Jeff Laytona8582152013-11-07 15:03:39 -0500821 cifs_dbg(FYI, "Unexpected lookup error %d\n", rc);
Steve Frenched2b9172008-01-20 00:30:29 +0000822 /* We special case check for Access Denied - since that
823 is a common return code */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700824 }
825
Jeff Layton2422f672010-06-16 13:40:16 -0400826lookup_out:
Steve Frenchd14537f12005-04-28 22:41:05 -0700827 kfree(full_path);
Jeff Layton7ffec372010-09-29 19:51:11 -0400828 cifs_put_tlink(tlink);
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400829 free_xid(xid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830 return ERR_PTR(rc);
831}
832
Linus Torvalds1da177e2005-04-16 15:20:36 -0700833static int
Al Viro0b728e12012-06-10 16:03:43 -0400834cifs_d_revalidate(struct dentry *direntry, unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700835{
Al Viro0b728e12012-06-10 16:03:43 -0400836 if (flags & LOOKUP_RCU)
Nick Piggin34286d62011-01-07 17:49:57 +1100837 return -ECHILD;
838
David Howells2b0143b2015-03-17 22:25:59 +0000839 if (d_really_is_positive(direntry)) {
Jeff Laytondf2cf172010-02-12 07:44:16 -0500840 if (cifs_revalidate_dentry(direntry))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700841 return 0;
Gerlando Falautoad4778f2011-10-18 10:58:50 +0200842 else {
843 /*
Ian Kent936ad902012-05-02 07:19:09 -0400844 * If the inode wasn't known to be a dfs entry when
845 * the dentry was instantiated, such as when created
846 * via ->readdir(), it needs to be set now since the
847 * attributes will have been updated by
848 * cifs_revalidate_dentry().
Gerlando Falautoad4778f2011-10-18 10:58:50 +0200849 */
David Howells2b0143b2015-03-17 22:25:59 +0000850 if (IS_AUTOMOUNT(d_inode(direntry)) &&
Ian Kent936ad902012-05-02 07:19:09 -0400851 !(direntry->d_flags & DCACHE_NEED_AUTOMOUNT)) {
852 spin_lock(&direntry->d_lock);
853 direntry->d_flags |= DCACHE_NEED_AUTOMOUNT;
854 spin_unlock(&direntry->d_lock);
855 }
856
Nick Piggin262f86a2010-11-11 18:42:16 +1100857 return 1;
Gerlando Falautoad4778f2011-10-18 10:58:50 +0200858 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700859 }
860
Nick Piggin262f86a2010-11-11 18:42:16 +1100861 /*
862 * This may be nfsd (or something), anyway, we can't see the
863 * intent of this. So, since this can be for creation, drop it.
864 */
Al Viro0b728e12012-06-10 16:03:43 -0400865 if (!flags)
Nick Piggin262f86a2010-11-11 18:42:16 +1100866 return 0;
867
868 /*
869 * Drop the negative dentry, in order to make sure to use the
870 * case sensitive name which is specified by user if this is
871 * for creation.
872 */
Al Viro0b728e12012-06-10 16:03:43 -0400873 if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
Al Viro407938e2011-06-25 21:37:18 -0400874 return 0;
Nick Piggin262f86a2010-11-11 18:42:16 +1100875
Miklos Szeredia00be0e2016-09-16 12:44:21 +0200876 if (time_after(jiffies, cifs_get_time(direntry) + HZ) || !lookupCacheEnabled)
Nick Piggin262f86a2010-11-11 18:42:16 +1100877 return 0;
878
879 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880}
881
882/* static int cifs_d_delete(struct dentry *direntry)
883{
884 int rc = 0;
885
Al Viro35c265e2014-08-19 20:25:34 -0400886 cifs_dbg(FYI, "In cifs d_delete, name = %pd\n", direntry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887
888 return rc;
889} */
890
Al Viro4fd03e82009-02-20 05:57:07 +0000891const struct dentry_operations cifs_dentry_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892 .d_revalidate = cifs_d_revalidate,
David Howells01c64fe2011-01-14 18:45:47 +0000893 .d_automount = cifs_dfs_d_automount,
Steve French5fdae1f2007-06-05 18:30:44 +0000894/* d_delete: cifs_d_delete, */ /* not needed except for debugging */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895};
Steve Frenchb92327f2005-08-22 20:09:43 -0700896
Linus Torvaldsda53be12013-05-21 15:22:44 -0700897static int cifs_ci_hash(const struct dentry *dentry, struct qstr *q)
Steve Frenchb92327f2005-08-22 20:09:43 -0700898{
Nick Pigginb1e6a012011-01-07 17:49:28 +1100899 struct nls_table *codepage = CIFS_SB(dentry->d_sb)->local_nls;
Steve Frenchb92327f2005-08-22 20:09:43 -0700900 unsigned long hash;
Jeff Laytonec71e0e2013-09-05 08:38:11 -0400901 wchar_t c;
902 int i, charlen;
Steve Frenchb92327f2005-08-22 20:09:43 -0700903
Linus Torvalds8387ff22016-06-10 07:51:30 -0700904 hash = init_name_hash(dentry);
Jeff Laytonec71e0e2013-09-05 08:38:11 -0400905 for (i = 0; i < q->len; i += charlen) {
906 charlen = codepage->char2uni(&q->name[i], q->len - i, &c);
907 /* error out if we can't convert the character */
908 if (unlikely(charlen < 0))
909 return charlen;
910 hash = partial_name_hash(cifs_toupper(c), hash);
911 }
Steve Frenchb92327f2005-08-22 20:09:43 -0700912 q->hash = end_name_hash(hash);
913
914 return 0;
915}
916
Al Viro6fa67e72016-07-31 16:37:25 -0400917static int cifs_ci_compare(const struct dentry *dentry,
Nick Piggin621e1552011-01-07 17:49:27 +1100918 unsigned int len, const char *str, const struct qstr *name)
Steve Frenchb92327f2005-08-22 20:09:43 -0700919{
Al Virod3fe1982016-07-29 18:23:59 -0400920 struct nls_table *codepage = CIFS_SB(dentry->d_sb)->local_nls;
Jeff Laytonec71e0e2013-09-05 08:38:11 -0400921 wchar_t c1, c2;
922 int i, l1, l2;
Steve Frenchb92327f2005-08-22 20:09:43 -0700923
Jeff Laytonec71e0e2013-09-05 08:38:11 -0400924 /*
925 * We make the assumption here that uppercase characters in the local
926 * codepage are always the same length as their lowercase counterparts.
927 *
928 * If that's ever not the case, then this will fail to match it.
929 */
930 if (name->len != len)
931 return 1;
932
933 for (i = 0; i < len; i += l1) {
934 /* Convert characters in both strings to UTF-16. */
935 l1 = codepage->char2uni(&str[i], len - i, &c1);
936 l2 = codepage->char2uni(&name->name[i], name->len - i, &c2);
937
938 /*
939 * If we can't convert either character, just declare it to
940 * be 1 byte long and compare the original byte.
941 */
942 if (unlikely(l1 < 0 && l2 < 0)) {
943 if (str[i] != name->name[i])
944 return 1;
945 l1 = 1;
946 continue;
947 }
948
949 /*
950 * Here, we again ass|u|me that upper/lowercase versions of
951 * a character are the same length in the local NLS.
952 */
953 if (l1 != l2)
954 return 1;
955
956 /* Now compare uppercase versions of these characters */
957 if (cifs_toupper(c1) != cifs_toupper(c2))
958 return 1;
959 }
960
961 return 0;
Steve Frenchb92327f2005-08-22 20:09:43 -0700962}
963
Al Viro4fd03e82009-02-20 05:57:07 +0000964const struct dentry_operations cifs_ci_dentry_ops = {
Steve Frenchb92327f2005-08-22 20:09:43 -0700965 .d_revalidate = cifs_d_revalidate,
966 .d_hash = cifs_ci_hash,
967 .d_compare = cifs_ci_compare,
David Howells01c64fe2011-01-14 18:45:47 +0000968 .d_automount = cifs_dfs_d_automount,
Steve Frenchb92327f2005-08-22 20:09:43 -0700969};