blob: 338d56936f6af694b7085284a38e7b751ba7eb66 [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 {
43 direntry->d_time = jiffies;
44 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,
50 struct cifs_tcon *tcon)
51{
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
62 if (tcon->Flags & SMB_SHARE_IS_IN_DFS)
63 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{
84 struct dentry *temp;
Steve French2fe87f02006-09-21 07:02:52 +000085 int namelen;
Steve French646dd532008-05-15 01:50:56 +000086 int dfsplen;
Linus Torvalds1da177e2005-04-16 15:20:36 -070087 char *full_path;
Steve French88274812006-03-09 22:21:45 +000088 char dirsep;
Jeff Layton0d424ad2010-09-20 16:01:35 -070089 struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
Steve French96daf2b2011-05-27 04:34:02 +000090 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
Al Virodc137bf2011-07-16 23:37:20 -040091 unsigned seq;
Linus Torvalds1da177e2005-04-16 15:20:36 -070092
Steve French646dd532008-05-15 01:50:56 +000093 dirsep = CIFS_DIR_SEP(cifs_sb);
Jeff Layton0d424ad2010-09-20 16:01:35 -070094 if (tcon->Flags & SMB_SHARE_IS_IN_DFS)
95 dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1);
Steve French646dd532008-05-15 01:50:56 +000096 else
97 dfsplen = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070098cifs_bp_rename_retry:
Steve Frenchf87d39d2011-05-27 03:50:55 +000099 namelen = dfsplen;
Al Virodc137bf2011-07-16 23:37:20 -0400100 seq = read_seqbegin(&rename_lock);
101 rcu_read_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102 for (temp = direntry; !IS_ROOT(temp);) {
103 namelen += (1 + temp->d_name.len);
104 temp = temp->d_parent;
Steve French5fdae1f2007-06-05 18:30:44 +0000105 if (temp == NULL) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500106 cifs_dbg(VFS, "corrupt dentry\n");
Al Virodc137bf2011-07-16 23:37:20 -0400107 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 return NULL;
109 }
110 }
Al Virodc137bf2011-07-16 23:37:20 -0400111 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112
113 full_path = kmalloc(namelen+1, GFP_KERNEL);
Steve French5fdae1f2007-06-05 18:30:44 +0000114 if (full_path == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 return full_path;
116 full_path[namelen] = 0; /* trailing null */
Al Virodc137bf2011-07-16 23:37:20 -0400117 rcu_read_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 for (temp = direntry; !IS_ROOT(temp);) {
Al Virodc137bf2011-07-16 23:37:20 -0400119 spin_lock(&temp->d_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120 namelen -= 1 + temp->d_name.len;
121 if (namelen < 0) {
Al Virodc137bf2011-07-16 23:37:20 -0400122 spin_unlock(&temp->d_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 break;
124 } else {
Steve French7f573562005-08-30 11:32:14 -0700125 full_path[namelen] = dirsep;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126 strncpy(full_path + namelen + 1, temp->d_name.name,
127 temp->d_name.len);
Joe Perchesf96637b2013-05-04 22:12:25 -0500128 cifs_dbg(FYI, "name: %s\n", full_path + namelen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129 }
Al Virodc137bf2011-07-16 23:37:20 -0400130 spin_unlock(&temp->d_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 temp = temp->d_parent;
Steve French5fdae1f2007-06-05 18:30:44 +0000132 if (temp == NULL) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500133 cifs_dbg(VFS, "corrupt dentry\n");
Al Virodc137bf2011-07-16 23:37:20 -0400134 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 kfree(full_path);
136 return NULL;
137 }
138 }
Al Virodc137bf2011-07-16 23:37:20 -0400139 rcu_read_unlock();
140 if (namelen != dfsplen || read_seqretry(&rename_lock, seq)) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500141 cifs_dbg(FYI, "did not end path lookup where expected. namelen=%ddfsplen=%d\n",
142 namelen, dfsplen);
Steve French5fdae1f2007-06-05 18:30:44 +0000143 /* presumably this is only possible if racing with a rename
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144 of one of the parent directories (we can not lock the dentries
145 above us to prevent this, but retrying should be harmless) */
146 kfree(full_path);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 goto cifs_bp_rename_retry;
148 }
Steve French2fe87f02006-09-21 07:02:52 +0000149 /* DIR_SEP already set for byte 0 / vs \ but not for
150 subsequent slashes in prepath which currently must
151 be entered the right way - not sure if there is an alternative
152 since the '\' is a valid posix character so we can not switch
153 those safely to '/' if any are found in the middle of the prepath */
154 /* BB test paths to Windows with '/' in the midst of prepath */
Steve French646dd532008-05-15 01:50:56 +0000155
156 if (dfsplen) {
Jeff Layton0d424ad2010-09-20 16:01:35 -0700157 strncpy(full_path, tcon->treeName, dfsplen);
Steve French646dd532008-05-15 01:50:56 +0000158 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
159 int i;
160 for (i = 0; i < dfsplen; i++) {
161 if (full_path[i] == '\\')
162 full_path[i] = '/';
163 }
164 }
165 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 return full_path;
167}
168
Miklos Szeredid2c12712012-06-05 15:10:23 +0200169/*
170 * Don't allow the separator character in a path component.
171 * The VFS will not allow "/", but "\" is allowed by posix.
172 */
173static int
174check_name(struct dentry *direntry)
175{
176 struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
177 int i;
178
179 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)) {
180 for (i = 0; i < direntry->d_name.len; i++) {
181 if (direntry->d_name.name[i] == '\\') {
Joe Perchesf96637b2013-05-04 22:12:25 -0500182 cifs_dbg(FYI, "Invalid file name\n");
Miklos Szeredid2c12712012-06-05 15:10:23 +0200183 return -EINVAL;
184 }
185 }
186 }
187 return 0;
188}
189
190
Steve French39798772006-05-31 22:40:51 +0000191/* Inode operations in similar order to how they appear in Linux file fs.h */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400193static int
194cifs_do_create(struct inode *inode, struct dentry *direntry, unsigned int xid,
195 struct tcon_link *tlink, unsigned oflags, umode_t mode,
Shirish Pargaonkarf1e32682013-12-11 16:29:53 -0600196 __u32 *oplock, struct cifs_fid *fid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197{
198 int rc = -ENOENT;
Jeff Layton67750fb2008-05-09 22:28:02 +0000199 int create_options = CREATE_NOT_DIR;
Pavel Shilovsky25364132012-09-18 16:20:27 -0700200 int desired_access;
Miklos Szeredid2c12712012-06-05 15:10:23 +0200201 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
202 struct cifs_tcon *tcon = tlink_tcon(tlink);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 char *full_path = NULL;
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000204 FILE_ALL_INFO *buf = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205 struct inode *newinode = NULL;
Miklos Szeredid2c12712012-06-05 15:10:23 +0200206 int disposition;
Pavel Shilovsky25364132012-09-18 16:20:27 -0700207 struct TCP_Server_Info *server = tcon->ses->server;
Pavel Shilovsky226730b2013-07-05 12:00:30 +0400208 struct cifs_open_parms oparms;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209
Miklos Szeredid2c12712012-06-05 15:10:23 +0200210 *oplock = 0;
Pavel Shilovsky10b9b982012-03-20 12:55:09 +0300211 if (tcon->ses->server->oplocks)
Miklos Szeredid2c12712012-06-05 15:10:23 +0200212 *oplock = REQ_OPLOCK;
Steve Frenchc3b2a0c2009-02-20 04:32:45 +0000213
Jeff Layton7ffec372010-09-29 19:51:11 -0400214 full_path = build_path_from_dentry(direntry);
215 if (full_path == NULL) {
216 rc = -ENOMEM;
Miklos Szeredid2c12712012-06-05 15:10:23 +0200217 goto out;
Jeff Layton7ffec372010-09-29 19:51:11 -0400218 }
219
Pavel Shilovsky29e20f92012-07-13 13:58:14 +0400220 if (tcon->unix_ext && cap_unix(tcon->ses) && !tcon->broken_posix_open &&
Steve Frenchc3b2a0c2009-02-20 04:32:45 +0000221 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
222 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
Pavel Shilovsky25364132012-09-18 16:20:27 -0700223 rc = cifs_posix_open(full_path, &newinode, inode->i_sb, mode,
224 oflags, oplock, &fid->netfid, xid);
Miklos Szeredid2c12712012-06-05 15:10:23 +0200225 switch (rc) {
226 case 0:
227 if (newinode == NULL) {
228 /* query inode info */
Steve French90e4ee52009-05-08 03:04:30 +0000229 goto cifs_create_get_file_info;
Miklos Szeredid2c12712012-06-05 15:10:23 +0200230 }
231
232 if (!S_ISREG(newinode->i_mode)) {
233 /*
234 * The server may allow us to open things like
235 * FIFOs, but the client isn't set up to deal
236 * with that. If it's not a regular file, just
237 * close it and proceed as if it were a normal
238 * lookup.
239 */
Pavel Shilovsky25364132012-09-18 16:20:27 -0700240 CIFSSMBClose(xid, tcon, fid->netfid);
Miklos Szeredid2c12712012-06-05 15:10:23 +0200241 goto cifs_create_get_file_info;
242 }
243 /* success, no need to query */
244 goto cifs_create_set_dentry;
245
246 case -ENOENT:
247 goto cifs_create_get_file_info;
248
249 case -EIO:
250 case -EINVAL:
251 /*
252 * EIO could indicate that (posix open) operation is not
253 * supported, despite what server claimed in capability
254 * negotiation.
255 *
256 * POSIX open in samba versions 3.3.1 and earlier could
257 * incorrectly fail with invalid parameter.
258 */
259 tcon->broken_posix_open = true;
260 break;
261
262 case -EREMOTE:
263 case -EOPNOTSUPP:
264 /*
265 * EREMOTE indicates DFS junction, which is not handled
266 * in posix open. If either that or op not supported
267 * returned, follow the normal lookup.
268 */
269 break;
270
271 default:
272 goto out;
273 }
274 /*
275 * fallthrough to retry, using older open call, this is case
276 * where server does not support this SMB level, and falsely
277 * claims capability (also get here for DFS case which should be
278 * rare for path not covered on files)
279 */
Steve Frenchc3b2a0c2009-02-20 04:32:45 +0000280 }
Steve Frenchf818dd52009-01-19 02:38:35 +0000281
Pavel Shilovsky25364132012-09-18 16:20:27 -0700282 desired_access = 0;
Miklos Szeredid2c12712012-06-05 15:10:23 +0200283 if (OPEN_FMODE(oflags) & FMODE_READ)
Pavel Shilovsky25364132012-09-18 16:20:27 -0700284 desired_access |= GENERIC_READ; /* is this too little? */
Miklos Szeredid2c12712012-06-05 15:10:23 +0200285 if (OPEN_FMODE(oflags) & FMODE_WRITE)
Pavel Shilovsky25364132012-09-18 16:20:27 -0700286 desired_access |= GENERIC_WRITE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287
Miklos Szeredid2c12712012-06-05 15:10:23 +0200288 disposition = FILE_OVERWRITE_IF;
289 if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
290 disposition = FILE_CREATE;
291 else if ((oflags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
292 disposition = FILE_OVERWRITE_IF;
293 else if ((oflags & O_CREAT) == O_CREAT)
294 disposition = FILE_OPEN_IF;
295 else
Joe Perchesf96637b2013-05-04 22:12:25 -0500296 cifs_dbg(FYI, "Create flag not set in create function\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297
Pavel Shilovsky25364132012-09-18 16:20:27 -0700298 /*
299 * BB add processing to set equivalent of mode - e.g. via CreateX with
300 * ACLs
301 */
302
303 if (!server->ops->open) {
304 rc = -ENOSYS;
305 goto out;
306 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307
Steve French5fdae1f2007-06-05 18:30:44 +0000308 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
309 if (buf == NULL) {
Jeff Layton232341b2010-08-05 13:58:38 -0400310 rc = -ENOMEM;
Miklos Szeredid2c12712012-06-05 15:10:23 +0200311 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 }
Jeff Layton67750fb2008-05-09 22:28:02 +0000313
Jeff Layton67750fb2008-05-09 22:28:02 +0000314 /*
315 * if we're not using unix extensions, see if we need to set
316 * ATTR_READONLY on the create call
317 */
Steve Frenchf818dd52009-01-19 02:38:35 +0000318 if (!tcon->unix_ext && (mode & S_IWUGO) == 0)
Jeff Layton67750fb2008-05-09 22:28:02 +0000319 create_options |= CREATE_OPTION_READONLY;
320
Shirish Pargaonkar3d3ea8e2011-09-26 09:56:44 -0500321 if (backup_cred(cifs_sb))
322 create_options |= CREATE_OPEN_BACKUP_INTENT;
323
Pavel Shilovsky226730b2013-07-05 12:00:30 +0400324 oparms.tcon = tcon;
325 oparms.cifs_sb = cifs_sb;
326 oparms.desired_access = desired_access;
327 oparms.create_options = create_options;
328 oparms.disposition = disposition;
329 oparms.path = full_path;
330 oparms.fid = fid;
Pavel Shilovsky9cbc0b72013-07-09 18:40:58 +0400331 oparms.reconnect = false;
Pavel Shilovsky226730b2013-07-05 12:00:30 +0400332
333 rc = server->ops->open(xid, &oparms, oplock, buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 if (rc) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500335 cifs_dbg(FYI, "cifs_create returned 0x%x\n", rc);
Miklos Szeredid2c12712012-06-05 15:10:23 +0200336 goto out;
Steve Frenchc3b2a0c2009-02-20 04:32:45 +0000337 }
338
Pavel Shilovsky25364132012-09-18 16:20:27 -0700339 /*
340 * If Open reported that we actually created a file then we now have to
341 * set the mode if possible.
342 */
Miklos Szeredid2c12712012-06-05 15:10:23 +0200343 if ((tcon->unix_ext) && (*oplock & CIFS_CREATE_ACTION)) {
Steve Frenchc3b2a0c2009-02-20 04:32:45 +0000344 struct cifs_unix_set_info_args args = {
Jeff Layton4e1e7fb2008-08-02 07:26:12 -0400345 .mode = mode,
346 .ctime = NO_CHANGE_64,
347 .atime = NO_CHANGE_64,
348 .mtime = NO_CHANGE_64,
349 .device = 0,
Steve Frenchc3b2a0c2009-02-20 04:32:45 +0000350 };
Jeff Layton4e1e7fb2008-08-02 07:26:12 -0400351
Steve Frenchc3b2a0c2009-02-20 04:32:45 +0000352 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
Eric W. Biederman49418b22013-02-06 00:57:56 -0800353 args.uid = current_fsuid();
Steve Frenchc3b2a0c2009-02-20 04:32:45 +0000354 if (inode->i_mode & S_ISGID)
Eric W. Biederman49418b22013-02-06 00:57:56 -0800355 args.gid = inode->i_gid;
Steve Frenchc3b2a0c2009-02-20 04:32:45 +0000356 else
Eric W. Biederman49418b22013-02-06 00:57:56 -0800357 args.gid = current_fsgid();
Steve French3ce53fc2007-06-08 14:55:14 +0000358 } else {
Eric W. Biederman49418b22013-02-06 00:57:56 -0800359 args.uid = INVALID_UID; /* no change */
360 args.gid = INVALID_GID; /* no change */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 }
Pavel Shilovsky25364132012-09-18 16:20:27 -0700362 CIFSSMBUnixSetFileInfo(xid, tcon, &args, fid->netfid,
363 current->tgid);
Steve Frenchc3b2a0c2009-02-20 04:32:45 +0000364 } else {
Pavel Shilovsky25364132012-09-18 16:20:27 -0700365 /*
366 * BB implement mode setting via Windows security
367 * descriptors e.g.
368 */
Steve Frenchc3b2a0c2009-02-20 04:32:45 +0000369 /* CIFSSMBWinSetPerms(xid,tcon,path,mode,-1,-1,nls);*/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370
Steve Frenchc3b2a0c2009-02-20 04:32:45 +0000371 /* Could set r/o dos attribute if mode & 0222 == 0 */
372 }
373
374cifs_create_get_file_info:
375 /* server might mask mode so we have to query for it */
376 if (tcon->unix_ext)
Pavel Shilovsky25364132012-09-18 16:20:27 -0700377 rc = cifs_get_inode_info_unix(&newinode, full_path, inode->i_sb,
378 xid);
Steve Frenchc3b2a0c2009-02-20 04:32:45 +0000379 else {
Pavel Shilovsky25364132012-09-18 16:20:27 -0700380 rc = cifs_get_inode_info(&newinode, full_path, buf, inode->i_sb,
Steve French42eacf92014-02-10 14:08:16 -0600381 xid, fid);
Steve Frenchc3b2a0c2009-02-20 04:32:45 +0000382 if (newinode) {
Pavel Shilovskyb8c32db2012-09-19 06:22:44 -0700383 if (server->ops->set_lease_key)
384 server->ops->set_lease_key(newinode, fid);
Steve Frenchc3b2a0c2009-02-20 04:32:45 +0000385 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
386 newinode->i_mode = mode;
Miklos Szeredid2c12712012-06-05 15:10:23 +0200387 if ((*oplock & CIFS_CREATE_ACTION) &&
Steve Frenchc3b2a0c2009-02-20 04:32:45 +0000388 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)) {
389 newinode->i_uid = current_fsuid();
390 if (inode->i_mode & S_ISGID)
391 newinode->i_gid = inode->i_gid;
392 else
393 newinode->i_gid = current_fsgid();
Steve French6473a552005-11-29 20:20:10 -0800394 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395 }
Steve Frenchc3b2a0c2009-02-20 04:32:45 +0000396 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397
Steve Frenchc3b2a0c2009-02-20 04:32:45 +0000398cifs_create_set_dentry:
Miklos Szeredid2c12712012-06-05 15:10:23 +0200399 if (rc != 0) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500400 cifs_dbg(FYI, "Create worked, get_inode_info failed rc = %d\n",
401 rc);
Pavel Shilovsky25364132012-09-18 16:20:27 -0700402 if (server->ops->close)
403 server->ops->close(xid, tcon, fid);
Miklos Szeredid2c12712012-06-05 15:10:23 +0200404 goto out;
Steve French5fdae1f2007-06-05 18:30:44 +0000405 }
Miklos Szeredid2c12712012-06-05 15:10:23 +0200406 d_drop(direntry);
407 d_add(direntry, newinode);
Jeff Layton2422f672010-06-16 13:40:16 -0400408
Miklos Szeredid2c12712012-06-05 15:10:23 +0200409out:
Steve Frenchd14537f12005-04-28 22:41:05 -0700410 kfree(buf);
411 kfree(full_path);
Miklos Szeredid2c12712012-06-05 15:10:23 +0200412 return rc;
413}
414
Al Virod9585272012-06-22 12:39:14 +0400415int
Miklos Szeredid2c12712012-06-05 15:10:23 +0200416cifs_atomic_open(struct inode *inode, struct dentry *direntry,
Al Viro30d90492012-06-22 12:40:19 +0400417 struct file *file, unsigned oflags, umode_t mode,
Al Viro47237682012-06-10 05:01:45 -0400418 int *opened)
Miklos Szeredid2c12712012-06-05 15:10:23 +0200419{
420 int rc;
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400421 unsigned int xid;
Miklos Szeredid2c12712012-06-05 15:10:23 +0200422 struct tcon_link *tlink;
423 struct cifs_tcon *tcon;
Pavel Shilovsky25364132012-09-18 16:20:27 -0700424 struct TCP_Server_Info *server;
Pavel Shilovskyfb1214e2012-09-18 16:20:26 -0700425 struct cifs_fid fid;
Pavel Shilovsky233839b2012-09-19 06:22:45 -0700426 struct cifs_pending_open open;
Miklos Szeredid2c12712012-06-05 15:10:23 +0200427 __u32 oplock;
Pavel Shilovskyfb1214e2012-09-18 16:20:26 -0700428 struct cifsFileInfo *file_info;
Miklos Szeredid2c12712012-06-05 15:10:23 +0200429
Pavel Shilovskyfb1214e2012-09-18 16:20:26 -0700430 /*
431 * Posix open is only called (at lookup time) for file create now. For
Miklos Szeredid2c12712012-06-05 15:10:23 +0200432 * opens (rather than creates), because we do not know if it is a file
433 * or directory yet, and current Samba no longer allows us to do posix
434 * open on dirs, we could end up wasting an open call on what turns out
435 * to be a dir. For file opens, we wait to call posix open till
436 * cifs_open. It could be added to atomic_open in the future but the
437 * performance tradeoff of the extra network request when EISDIR or
438 * EACCES is returned would have to be weighed against the 50% reduction
439 * in network traffic in the other paths.
440 */
441 if (!(oflags & O_CREAT)) {
Sachin Prabhu3798f472012-11-05 11:39:32 +0000442 struct dentry *res;
443
444 /*
445 * Check for hashed negative dentry. We have already revalidated
446 * the dentry and it is fine. No need to perform another lookup.
447 */
448 if (!d_unhashed(direntry))
449 return -ENOENT;
450
451 res = cifs_lookup(inode, direntry, 0);
Miklos Szeredid2c12712012-06-05 15:10:23 +0200452 if (IS_ERR(res))
Al Virod9585272012-06-22 12:39:14 +0400453 return PTR_ERR(res);
Miklos Szeredid2c12712012-06-05 15:10:23 +0200454
Al Viroe45198a2012-06-10 06:48:09 -0400455 return finish_no_open(file, res);
Miklos Szeredid2c12712012-06-05 15:10:23 +0200456 }
457
458 rc = check_name(direntry);
459 if (rc)
Al Virod9585272012-06-22 12:39:14 +0400460 return rc;
Miklos Szeredid2c12712012-06-05 15:10:23 +0200461
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400462 xid = get_xid();
Miklos Szeredid2c12712012-06-05 15:10:23 +0200463
Al Viro35c265e2014-08-19 20:25:34 -0400464 cifs_dbg(FYI, "parent inode = 0x%p name is: %pd and dentry = 0x%p\n",
465 inode, direntry, direntry);
Miklos Szeredid2c12712012-06-05 15:10:23 +0200466
467 tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb));
Wei Yongjunefb79f22013-04-04 14:16:21 +0800468 if (IS_ERR(tlink)) {
469 rc = PTR_ERR(tlink);
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400470 goto out_free_xid;
Wei Yongjunefb79f22013-04-04 14:16:21 +0800471 }
Miklos Szeredid2c12712012-06-05 15:10:23 +0200472
473 tcon = tlink_tcon(tlink);
Pavel Shilovsky25364132012-09-18 16:20:27 -0700474 server = tcon->ses->server;
Miklos Szeredid2c12712012-06-05 15:10:23 +0200475
Pavel Shilovskyb8c32db2012-09-19 06:22:44 -0700476 if (server->ops->new_lease_key)
477 server->ops->new_lease_key(&fid);
478
Pavel Shilovsky233839b2012-09-19 06:22:45 -0700479 cifs_add_pending_open(&fid, tlink, &open);
480
Miklos Szeredid2c12712012-06-05 15:10:23 +0200481 rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode,
Shirish Pargaonkarf1e32682013-12-11 16:29:53 -0600482 &oplock, &fid);
Miklos Szeredid2c12712012-06-05 15:10:23 +0200483
Pavel Shilovsky233839b2012-09-19 06:22:45 -0700484 if (rc) {
485 cifs_del_pending_open(&open);
Miklos Szeredid2c12712012-06-05 15:10:23 +0200486 goto out;
Pavel Shilovsky233839b2012-09-19 06:22:45 -0700487 }
Miklos Szeredid2c12712012-06-05 15:10:23 +0200488
Shirish Pargaonkarf1e32682013-12-11 16:29:53 -0600489 if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
490 *opened |= FILE_CREATED;
491
Al Viro30d90492012-06-22 12:40:19 +0400492 rc = finish_open(file, direntry, generic_file_open, opened);
493 if (rc) {
Pavel Shilovsky25364132012-09-18 16:20:27 -0700494 if (server->ops->close)
495 server->ops->close(xid, tcon, &fid);
Pavel Shilovsky233839b2012-09-19 06:22:45 -0700496 cifs_del_pending_open(&open);
Miklos Szeredid2c12712012-06-05 15:10:23 +0200497 goto out;
498 }
499
Namjae Jeon787aded2014-08-22 14:22:51 +0900500 if (file->f_flags & O_DIRECT &&
501 CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) {
502 if (CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
503 file->f_op = &cifs_file_direct_nobrl_ops;
504 else
505 file->f_op = &cifs_file_direct_ops;
506 }
507
Pavel Shilovskyfb1214e2012-09-18 16:20:26 -0700508 file_info = cifs_new_fileinfo(&fid, file, tlink, oplock);
509 if (file_info == NULL) {
Pavel Shilovsky25364132012-09-18 16:20:27 -0700510 if (server->ops->close)
511 server->ops->close(xid, tcon, &fid);
Pavel Shilovsky233839b2012-09-19 06:22:45 -0700512 cifs_del_pending_open(&open);
Miklos Szeredidfb1d612013-09-16 14:51:59 +0200513 fput(file);
Al Virod9585272012-06-22 12:39:14 +0400514 rc = -ENOMEM;
Miklos Szeredid2c12712012-06-05 15:10:23 +0200515 }
516
517out:
Jeff Layton7ffec372010-09-29 19:51:11 -0400518 cifs_put_tlink(tlink);
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400519out_free_xid:
520 free_xid(xid);
Al Virod9585272012-06-22 12:39:14 +0400521 return rc;
Miklos Szeredid2c12712012-06-05 15:10:23 +0200522}
523
524int cifs_create(struct inode *inode, struct dentry *direntry, umode_t mode,
Al Viroebfc3b42012-06-10 18:05:36 -0400525 bool excl)
Miklos Szeredid2c12712012-06-05 15:10:23 +0200526{
527 int rc;
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400528 unsigned int xid = get_xid();
Miklos Szeredid2c12712012-06-05 15:10:23 +0200529 /*
530 * BB below access is probably too much for mknod to request
531 * but we have to do query and setpathinfo so requesting
532 * less could fail (unless we want to request getatr and setatr
533 * permissions (only). At least for POSIX we do not have to
534 * request so much.
535 */
536 unsigned oflags = O_EXCL | O_CREAT | O_RDWR;
537 struct tcon_link *tlink;
Pavel Shilovsky25364132012-09-18 16:20:27 -0700538 struct cifs_tcon *tcon;
539 struct TCP_Server_Info *server;
540 struct cifs_fid fid;
Miklos Szeredid2c12712012-06-05 15:10:23 +0200541 __u32 oplock;
Miklos Szeredid2c12712012-06-05 15:10:23 +0200542
Al Viro35c265e2014-08-19 20:25:34 -0400543 cifs_dbg(FYI, "cifs_create parent inode = 0x%p name is: %pd and dentry = 0x%p\n",
544 inode, direntry, direntry);
Miklos Szeredid2c12712012-06-05 15:10:23 +0200545
546 tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb));
547 rc = PTR_ERR(tlink);
548 if (IS_ERR(tlink))
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400549 goto out_free_xid;
Miklos Szeredid2c12712012-06-05 15:10:23 +0200550
Pavel Shilovsky25364132012-09-18 16:20:27 -0700551 tcon = tlink_tcon(tlink);
552 server = tcon->ses->server;
Pavel Shilovskyb8c32db2012-09-19 06:22:44 -0700553
554 if (server->ops->new_lease_key)
555 server->ops->new_lease_key(&fid);
556
557 rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode,
Shirish Pargaonkarf1e32682013-12-11 16:29:53 -0600558 &oplock, &fid);
Pavel Shilovsky25364132012-09-18 16:20:27 -0700559 if (!rc && server->ops->close)
560 server->ops->close(xid, tcon, &fid);
Miklos Szeredid2c12712012-06-05 15:10:23 +0200561
562 cifs_put_tlink(tlink);
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400563out_free_xid:
564 free_xid(xid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565 return rc;
566}
567
Al Viro1a67aaf2011-07-26 01:52:52 -0400568int cifs_mknod(struct inode *inode, struct dentry *direntry, umode_t mode,
Steve French5fdae1f2007-06-05 18:30:44 +0000569 dev_t device_number)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570{
571 int rc = -EPERM;
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400572 unsigned int xid;
Shirish Pargaonkar3d3ea8e2011-09-26 09:56:44 -0500573 int create_options = CREATE_NOT_DIR | CREATE_OPTION_SPECIAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574 struct cifs_sb_info *cifs_sb;
Jeff Layton7ffec372010-09-29 19:51:11 -0400575 struct tcon_link *tlink;
Pavel Shilovskydd120672014-01-16 15:53:34 +0400576 struct cifs_tcon *tcon;
Pavel Shilovskyfa2989f2011-05-26 10:01:59 +0400577 struct cifs_io_parms io_parms;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578 char *full_path = NULL;
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000579 struct inode *newinode = NULL;
Steve Frenchdb8b6312014-09-22 05:13:55 -0500580 __u32 oplock = 0;
Pavel Shilovskyd81b8a42014-01-16 15:53:36 +0400581 struct cifs_fid fid;
582 struct cifs_open_parms oparms;
Jeff Layton5d9ac7f2010-08-05 13:58:22 -0400583 FILE_ALL_INFO *buf = NULL;
584 unsigned int bytes_written;
585 struct win_dev *pdev;
Steve Frenchdb8b6312014-09-22 05:13:55 -0500586 struct kvec iov[2];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587
588 if (!old_valid_dev(device_number))
589 return -EINVAL;
590
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591 cifs_sb = CIFS_SB(inode->i_sb);
Jeff Layton7ffec372010-09-29 19:51:11 -0400592 tlink = cifs_sb_tlink(cifs_sb);
593 if (IS_ERR(tlink))
594 return PTR_ERR(tlink);
595
Pavel Shilovskydd120672014-01-16 15:53:34 +0400596 tcon = tlink_tcon(tlink);
Jeff Layton7ffec372010-09-29 19:51:11 -0400597
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400598 xid = get_xid();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600 full_path = build_path_from_dentry(direntry);
Jeff Layton5d9ac7f2010-08-05 13:58:22 -0400601 if (full_path == NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602 rc = -ENOMEM;
Jeff Layton5d9ac7f2010-08-05 13:58:22 -0400603 goto mknod_out;
604 }
605
Pavel Shilovskydd120672014-01-16 15:53:34 +0400606 if (tcon->unix_ext) {
Jeff Layton4e1e7fb2008-08-02 07:26:12 -0400607 struct cifs_unix_set_info_args args = {
Al Viroce3b0f82009-03-29 19:08:22 -0400608 .mode = mode & ~current_umask(),
Jeff Layton4e1e7fb2008-08-02 07:26:12 -0400609 .ctime = NO_CHANGE_64,
610 .atime = NO_CHANGE_64,
611 .mtime = NO_CHANGE_64,
612 .device = device_number,
613 };
Steve French5fdae1f2007-06-05 18:30:44 +0000614 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
Eric W. Biederman49418b22013-02-06 00:57:56 -0800615 args.uid = current_fsuid();
616 args.gid = current_fsgid();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617 } else {
Eric W. Biederman49418b22013-02-06 00:57:56 -0800618 args.uid = INVALID_UID; /* no change */
619 args.gid = INVALID_GID; /* no change */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620 }
Pavel Shilovskydd120672014-01-16 15:53:34 +0400621 rc = CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args,
Jeff Layton01ea95e2009-07-09 20:02:49 -0400622 cifs_sb->local_nls,
623 cifs_sb->mnt_cifs_flags &
624 CIFS_MOUNT_MAP_SPECIAL_CHR);
Jeff Layton5d9ac7f2010-08-05 13:58:22 -0400625 if (rc)
626 goto mknod_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627
Jeff Layton5d9ac7f2010-08-05 13:58:22 -0400628 rc = cifs_get_inode_info_unix(&newinode, full_path,
Steve French5fdae1f2007-06-05 18:30:44 +0000629 inode->i_sb, xid);
Steve Frenchd7245c22005-07-14 18:25:12 -0500630
Jeff Layton5d9ac7f2010-08-05 13:58:22 -0400631 if (rc == 0)
632 d_instantiate(direntry, newinode);
633 goto mknod_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634 }
635
Jeff Layton5d9ac7f2010-08-05 13:58:22 -0400636 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL))
637 goto mknod_out;
638
639
Joe Perchesf96637b2013-05-04 22:12:25 -0500640 cifs_dbg(FYI, "sfu compat create special file\n");
Jeff Layton5d9ac7f2010-08-05 13:58:22 -0400641
642 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
643 if (buf == NULL) {
644 kfree(full_path);
645 rc = -ENOMEM;
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400646 free_xid(xid);
Jeff Layton5d9ac7f2010-08-05 13:58:22 -0400647 return rc;
648 }
649
Shirish Pargaonkar3d3ea8e2011-09-26 09:56:44 -0500650 if (backup_cred(cifs_sb))
651 create_options |= CREATE_OPEN_BACKUP_INTENT;
652
Pavel Shilovskyd81b8a42014-01-16 15:53:36 +0400653 oparms.tcon = tcon;
654 oparms.cifs_sb = cifs_sb;
655 oparms.desired_access = GENERIC_WRITE;
656 oparms.create_options = create_options;
657 oparms.disposition = FILE_CREATE;
658 oparms.path = full_path;
659 oparms.fid = &fid;
660 oparms.reconnect = false;
661
Steve Frenchdb8b6312014-09-22 05:13:55 -0500662 if (tcon->ses->server->oplocks)
663 oplock = REQ_OPLOCK;
664 else
665 oplock = 0;
666 rc = tcon->ses->server->ops->open(xid, &oparms, &oplock, buf);
Jeff Layton5d9ac7f2010-08-05 13:58:22 -0400667 if (rc)
668 goto mknod_out;
669
Pavel Shilovskydd120672014-01-16 15:53:34 +0400670 /*
671 * BB Do not bother to decode buf since no local inode yet to put
672 * timestamps in, but we can reuse it safely.
673 */
Jeff Layton5d9ac7f2010-08-05 13:58:22 -0400674
675 pdev = (struct win_dev *)buf;
Pavel Shilovskyfa2989f2011-05-26 10:01:59 +0400676 io_parms.pid = current->tgid;
Pavel Shilovskydd120672014-01-16 15:53:34 +0400677 io_parms.tcon = tcon;
Pavel Shilovskyfa2989f2011-05-26 10:01:59 +0400678 io_parms.offset = 0;
679 io_parms.length = sizeof(struct win_dev);
Steve Frenchdb8b6312014-09-22 05:13:55 -0500680 iov[1].iov_base = buf;
681 iov[1].iov_len = sizeof(struct win_dev);
Jeff Layton5d9ac7f2010-08-05 13:58:22 -0400682 if (S_ISCHR(mode)) {
683 memcpy(pdev->type, "IntxCHR", 8);
Pavel Shilovskydd120672014-01-16 15:53:34 +0400684 pdev->major = cpu_to_le64(MAJOR(device_number));
685 pdev->minor = cpu_to_le64(MINOR(device_number));
Steve Frenchdb8b6312014-09-22 05:13:55 -0500686 rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms,
687 &bytes_written, iov, 1);
Jeff Layton5d9ac7f2010-08-05 13:58:22 -0400688 } else if (S_ISBLK(mode)) {
689 memcpy(pdev->type, "IntxBLK", 8);
Pavel Shilovskydd120672014-01-16 15:53:34 +0400690 pdev->major = cpu_to_le64(MAJOR(device_number));
691 pdev->minor = cpu_to_le64(MINOR(device_number));
Steve Frenchdb8b6312014-09-22 05:13:55 -0500692 rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms,
693 &bytes_written, iov, 1);
Jeff Layton5d9ac7f2010-08-05 13:58:22 -0400694 } /* else if (S_ISFIFO) */
Steve Frenchdb8b6312014-09-22 05:13:55 -0500695 tcon->ses->server->ops->close(xid, tcon, &fid);
Jeff Layton5d9ac7f2010-08-05 13:58:22 -0400696 d_drop(direntry);
697
698 /* FIXME: add code here to set EAs */
699
700mknod_out:
Steve Frenchd14537f12005-04-28 22:41:05 -0700701 kfree(full_path);
Jeff Layton5d9ac7f2010-08-05 13:58:22 -0400702 kfree(buf);
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400703 free_xid(xid);
Jeff Layton7ffec372010-09-29 19:51:11 -0400704 cifs_put_tlink(tlink);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705 return rc;
706}
707
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708struct dentry *
Steve French5fdae1f2007-06-05 18:30:44 +0000709cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
Al Viro00cd8dd2012-06-10 17:13:09 -0400710 unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711{
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400712 unsigned int xid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713 int rc = 0; /* to get around spurious gcc warning, set to zero here */
714 struct cifs_sb_info *cifs_sb;
Jeff Layton7ffec372010-09-29 19:51:11 -0400715 struct tcon_link *tlink;
Steve French96daf2b2011-05-27 04:34:02 +0000716 struct cifs_tcon *pTcon;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717 struct inode *newInode = NULL;
718 char *full_path = NULL;
719
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400720 xid = get_xid();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700721
Al Viro35c265e2014-08-19 20:25:34 -0400722 cifs_dbg(FYI, "parent inode = 0x%p name is: %pd and dentry = 0x%p\n",
723 parent_dir_inode, direntry, direntry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725 /* check whether path exists */
726
727 cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
Jeff Layton7ffec372010-09-29 19:51:11 -0400728 tlink = cifs_sb_tlink(cifs_sb);
729 if (IS_ERR(tlink)) {
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400730 free_xid(xid);
Jeff Layton7ffec372010-09-29 19:51:11 -0400731 return (struct dentry *)tlink;
732 }
733 pTcon = tlink_tcon(tlink);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734
Miklos Szeredid2c12712012-06-05 15:10:23 +0200735 rc = check_name(direntry);
736 if (rc)
Jeff Layton7ffec372010-09-29 19:51:11 -0400737 goto lookup_out;
Jeff Layton5ddf1e02009-07-05 11:01:02 -0400738
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739 /* can not grab the rename sem here since it would
740 deadlock in the cases (beginning of sys_rename itself)
741 in which we already have the sb rename sem */
742 full_path = build_path_from_dentry(direntry);
Steve French5fdae1f2007-06-05 18:30:44 +0000743 if (full_path == NULL) {
Jeff Layton7ffec372010-09-29 19:51:11 -0400744 rc = -ENOMEM;
745 goto lookup_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746 }
747
David Howells2b0143b2015-03-17 22:25:59 +0000748 if (d_really_is_positive(direntry)) {
Joe Perchesf96637b2013-05-04 22:12:25 -0500749 cifs_dbg(FYI, "non-NULL inode in lookup\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750 } else {
Joe Perchesf96637b2013-05-04 22:12:25 -0500751 cifs_dbg(FYI, "NULL inode in lookup\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752 }
Joe Perchesf96637b2013-05-04 22:12:25 -0500753 cifs_dbg(FYI, "Full path: %s inode = 0x%p\n",
David Howells2b0143b2015-03-17 22:25:59 +0000754 full_path, d_inode(direntry));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755
Steve Frencha6ce4932009-04-09 01:14:32 +0000756 if (pTcon->unix_ext) {
Miklos Szeredid2c12712012-06-05 15:10:23 +0200757 rc = cifs_get_inode_info_unix(&newInode, full_path,
758 parent_dir_inode->i_sb, xid);
759 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760 rc = cifs_get_inode_info(&newInode, full_path, NULL,
Steve Frencha6ce4932009-04-09 01:14:32 +0000761 parent_dir_inode->i_sb, xid, NULL);
Miklos Szeredid2c12712012-06-05 15:10:23 +0200762 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763
764 if ((rc == 0) && (newInode != NULL)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765 d_add(direntry, newInode);
Steve French5fdae1f2007-06-05 18:30:44 +0000766 /* since paths are not looked up by component - the parent
Steve French3abb9272005-11-28 08:16:13 -0800767 directories are presumed to be good here */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768 renew_parental_timestamps(direntry);
769
770 } else if (rc == -ENOENT) {
771 rc = 0;
Steve French3abb9272005-11-28 08:16:13 -0800772 direntry->d_time = jiffies;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773 d_add(direntry, NULL);
Steve French5fdae1f2007-06-05 18:30:44 +0000774 /* if it was once a directory (but how can we tell?) we could do
775 shrink_dcache_parent(direntry); */
Steve Frenched2b9172008-01-20 00:30:29 +0000776 } else if (rc != -EACCES) {
Jeff Laytona8582152013-11-07 15:03:39 -0500777 cifs_dbg(FYI, "Unexpected lookup error %d\n", rc);
Steve Frenched2b9172008-01-20 00:30:29 +0000778 /* We special case check for Access Denied - since that
779 is a common return code */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780 }
781
Jeff Layton2422f672010-06-16 13:40:16 -0400782lookup_out:
Steve Frenchd14537f12005-04-28 22:41:05 -0700783 kfree(full_path);
Jeff Layton7ffec372010-09-29 19:51:11 -0400784 cifs_put_tlink(tlink);
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400785 free_xid(xid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786 return ERR_PTR(rc);
787}
788
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789static int
Al Viro0b728e12012-06-10 16:03:43 -0400790cifs_d_revalidate(struct dentry *direntry, unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791{
Al Viro0b728e12012-06-10 16:03:43 -0400792 if (flags & LOOKUP_RCU)
Nick Piggin34286d62011-01-07 17:49:57 +1100793 return -ECHILD;
794
David Howells2b0143b2015-03-17 22:25:59 +0000795 if (d_really_is_positive(direntry)) {
Jeff Laytondf2cf172010-02-12 07:44:16 -0500796 if (cifs_revalidate_dentry(direntry))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700797 return 0;
Gerlando Falautoad4778f2011-10-18 10:58:50 +0200798 else {
799 /*
Ian Kent936ad902012-05-02 07:19:09 -0400800 * If the inode wasn't known to be a dfs entry when
801 * the dentry was instantiated, such as when created
802 * via ->readdir(), it needs to be set now since the
803 * attributes will have been updated by
804 * cifs_revalidate_dentry().
Gerlando Falautoad4778f2011-10-18 10:58:50 +0200805 */
David Howells2b0143b2015-03-17 22:25:59 +0000806 if (IS_AUTOMOUNT(d_inode(direntry)) &&
Ian Kent936ad902012-05-02 07:19:09 -0400807 !(direntry->d_flags & DCACHE_NEED_AUTOMOUNT)) {
808 spin_lock(&direntry->d_lock);
809 direntry->d_flags |= DCACHE_NEED_AUTOMOUNT;
810 spin_unlock(&direntry->d_lock);
811 }
812
Nick Piggin262f86a2010-11-11 18:42:16 +1100813 return 1;
Gerlando Falautoad4778f2011-10-18 10:58:50 +0200814 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700815 }
816
Nick Piggin262f86a2010-11-11 18:42:16 +1100817 /*
818 * This may be nfsd (or something), anyway, we can't see the
819 * intent of this. So, since this can be for creation, drop it.
820 */
Al Viro0b728e12012-06-10 16:03:43 -0400821 if (!flags)
Nick Piggin262f86a2010-11-11 18:42:16 +1100822 return 0;
823
824 /*
825 * Drop the negative dentry, in order to make sure to use the
826 * case sensitive name which is specified by user if this is
827 * for creation.
828 */
Al Viro0b728e12012-06-10 16:03:43 -0400829 if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
Al Viro407938e2011-06-25 21:37:18 -0400830 return 0;
Nick Piggin262f86a2010-11-11 18:42:16 +1100831
832 if (time_after(jiffies, direntry->d_time + HZ) || !lookupCacheEnabled)
833 return 0;
834
835 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700836}
837
838/* static int cifs_d_delete(struct dentry *direntry)
839{
840 int rc = 0;
841
Al Viro35c265e2014-08-19 20:25:34 -0400842 cifs_dbg(FYI, "In cifs d_delete, name = %pd\n", direntry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843
844 return rc;
845} */
846
Al Viro4fd03e82009-02-20 05:57:07 +0000847const struct dentry_operations cifs_dentry_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700848 .d_revalidate = cifs_d_revalidate,
David Howells01c64fe2011-01-14 18:45:47 +0000849 .d_automount = cifs_dfs_d_automount,
Steve French5fdae1f2007-06-05 18:30:44 +0000850/* d_delete: cifs_d_delete, */ /* not needed except for debugging */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700851};
Steve Frenchb92327f2005-08-22 20:09:43 -0700852
Linus Torvaldsda53be12013-05-21 15:22:44 -0700853static int cifs_ci_hash(const struct dentry *dentry, struct qstr *q)
Steve Frenchb92327f2005-08-22 20:09:43 -0700854{
Nick Pigginb1e6a012011-01-07 17:49:28 +1100855 struct nls_table *codepage = CIFS_SB(dentry->d_sb)->local_nls;
Steve Frenchb92327f2005-08-22 20:09:43 -0700856 unsigned long hash;
Jeff Laytonec71e0e2013-09-05 08:38:11 -0400857 wchar_t c;
858 int i, charlen;
Steve Frenchb92327f2005-08-22 20:09:43 -0700859
860 hash = init_name_hash();
Jeff Laytonec71e0e2013-09-05 08:38:11 -0400861 for (i = 0; i < q->len; i += charlen) {
862 charlen = codepage->char2uni(&q->name[i], q->len - i, &c);
863 /* error out if we can't convert the character */
864 if (unlikely(charlen < 0))
865 return charlen;
866 hash = partial_name_hash(cifs_toupper(c), hash);
867 }
Steve Frenchb92327f2005-08-22 20:09:43 -0700868 q->hash = end_name_hash(hash);
869
870 return 0;
871}
872
Linus Torvaldsda53be12013-05-21 15:22:44 -0700873static int cifs_ci_compare(const struct dentry *parent, const struct dentry *dentry,
Nick Piggin621e1552011-01-07 17:49:27 +1100874 unsigned int len, const char *str, const struct qstr *name)
Steve Frenchb92327f2005-08-22 20:09:43 -0700875{
Linus Torvaldsda53be12013-05-21 15:22:44 -0700876 struct nls_table *codepage = CIFS_SB(parent->d_sb)->local_nls;
Jeff Laytonec71e0e2013-09-05 08:38:11 -0400877 wchar_t c1, c2;
878 int i, l1, l2;
Steve Frenchb92327f2005-08-22 20:09:43 -0700879
Jeff Laytonec71e0e2013-09-05 08:38:11 -0400880 /*
881 * We make the assumption here that uppercase characters in the local
882 * codepage are always the same length as their lowercase counterparts.
883 *
884 * If that's ever not the case, then this will fail to match it.
885 */
886 if (name->len != len)
887 return 1;
888
889 for (i = 0; i < len; i += l1) {
890 /* Convert characters in both strings to UTF-16. */
891 l1 = codepage->char2uni(&str[i], len - i, &c1);
892 l2 = codepage->char2uni(&name->name[i], name->len - i, &c2);
893
894 /*
895 * If we can't convert either character, just declare it to
896 * be 1 byte long and compare the original byte.
897 */
898 if (unlikely(l1 < 0 && l2 < 0)) {
899 if (str[i] != name->name[i])
900 return 1;
901 l1 = 1;
902 continue;
903 }
904
905 /*
906 * Here, we again ass|u|me that upper/lowercase versions of
907 * a character are the same length in the local NLS.
908 */
909 if (l1 != l2)
910 return 1;
911
912 /* Now compare uppercase versions of these characters */
913 if (cifs_toupper(c1) != cifs_toupper(c2))
914 return 1;
915 }
916
917 return 0;
Steve Frenchb92327f2005-08-22 20:09:43 -0700918}
919
Al Viro4fd03e82009-02-20 05:57:07 +0000920const struct dentry_operations cifs_ci_dentry_ops = {
Steve Frenchb92327f2005-08-22 20:09:43 -0700921 .d_revalidate = cifs_d_revalidate,
922 .d_hash = cifs_ci_hash,
923 .d_compare = cifs_ci_compare,
David Howells01c64fe2011-01-14 18:45:47 +0000924 .d_automount = cifs_dfs_d_automount,
Steve Frenchb92327f2005-08-22 20:09:43 -0700925};