ia64/linux-2.6.18-xen.hg

view fs/cifs/link.c @ 524:7f8b544237bf

netfront: Allow netfront in domain 0.

This is useful if your physical network device is in a utility domain.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
author Keir Fraser <keir.fraser@citrix.com>
date Tue Apr 15 15:18:58 2008 +0100 (2008-04-15)
parents 831230e53067
children
line source
1 /*
2 * fs/cifs/link.c
3 *
4 * Copyright (C) International Business Machines Corp., 2002,2003
5 * Author(s): Steve French (sfrench@us.ibm.com)
6 *
7 * This library is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU Lesser General Public License as published
9 * by the Free Software Foundation; either version 2.1 of the License, or
10 * (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
15 * the GNU Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public License
18 * along with this library; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21 #include <linux/fs.h>
22 #include <linux/stat.h>
23 #include <linux/namei.h>
24 #include "cifsfs.h"
25 #include "cifspdu.h"
26 #include "cifsglob.h"
27 #include "cifsproto.h"
28 #include "cifs_debug.h"
29 #include "cifs_fs_sb.h"
31 int
32 cifs_hardlink(struct dentry *old_file, struct inode *inode,
33 struct dentry *direntry)
34 {
35 int rc = -EACCES;
36 int xid;
37 char *fromName = NULL;
38 char *toName = NULL;
39 struct cifs_sb_info *cifs_sb_target;
40 struct cifsTconInfo *pTcon;
41 struct cifsInodeInfo *cifsInode;
43 xid = GetXid();
45 cifs_sb_target = CIFS_SB(inode->i_sb);
46 pTcon = cifs_sb_target->tcon;
48 /* No need to check for cross device links since server will do that
49 BB note DFS case in future though (when we may have to check) */
51 fromName = build_path_from_dentry(old_file);
52 toName = build_path_from_dentry(direntry);
53 if((fromName == NULL) || (toName == NULL)) {
54 rc = -ENOMEM;
55 goto cifs_hl_exit;
56 }
58 if (cifs_sb_target->tcon->ses->capabilities & CAP_UNIX)
59 rc = CIFSUnixCreateHardLink(xid, pTcon, fromName, toName,
60 cifs_sb_target->local_nls,
61 cifs_sb_target->mnt_cifs_flags &
62 CIFS_MOUNT_MAP_SPECIAL_CHR);
63 else {
64 rc = CIFSCreateHardLink(xid, pTcon, fromName, toName,
65 cifs_sb_target->local_nls,
66 cifs_sb_target->mnt_cifs_flags &
67 CIFS_MOUNT_MAP_SPECIAL_CHR);
68 if((rc == -EIO) || (rc == -EINVAL))
69 rc = -EOPNOTSUPP;
70 }
72 /* if (!rc) */
73 {
74 /* renew_parental_timestamps(old_file);
75 inode->i_nlink++;
76 mark_inode_dirty(inode);
77 d_instantiate(direntry, inode); */
78 /* BB add call to either mark inode dirty or refresh its data and timestamp to current time */
79 }
80 d_drop(direntry); /* force new lookup from server */
81 cifsInode = CIFS_I(old_file->d_inode);
82 cifsInode->time = 0; /* will force revalidate to go get info when needed */
84 cifs_hl_exit:
85 kfree(fromName);
86 kfree(toName);
87 FreeXid(xid);
88 return rc;
89 }
91 void *
92 cifs_follow_link(struct dentry *direntry, struct nameidata *nd)
93 {
94 struct inode *inode = direntry->d_inode;
95 int rc = -EACCES;
96 int xid;
97 char *full_path = NULL;
98 char * target_path = ERR_PTR(-ENOMEM);
99 struct cifs_sb_info *cifs_sb;
100 struct cifsTconInfo *pTcon;
102 xid = GetXid();
104 full_path = build_path_from_dentry(direntry);
106 if (!full_path)
107 goto out_no_free;
109 cFYI(1, ("Full path: %s inode = 0x%p", full_path, inode));
110 cifs_sb = CIFS_SB(inode->i_sb);
111 pTcon = cifs_sb->tcon;
112 target_path = kmalloc(PATH_MAX, GFP_KERNEL);
113 if (!target_path) {
114 target_path = ERR_PTR(-ENOMEM);
115 goto out;
116 }
118 /* BB add read reparse point symlink code and Unix extensions symlink code here BB */
119 if (pTcon->ses->capabilities & CAP_UNIX)
120 rc = CIFSSMBUnixQuerySymLink(xid, pTcon, full_path,
121 target_path,
122 PATH_MAX-1,
123 cifs_sb->local_nls);
124 else {
125 /* rc = CIFSSMBQueryReparseLinkInfo */
126 /* BB Add code to Query ReparsePoint info */
127 /* BB Add MAC style xsymlink check here if enabled */
128 }
130 if (rc == 0) {
132 /* BB Add special case check for Samba DFS symlinks */
134 target_path[PATH_MAX-1] = 0;
135 } else {
136 kfree(target_path);
137 target_path = ERR_PTR(rc);
138 }
140 out:
141 kfree(full_path);
142 out_no_free:
143 FreeXid(xid);
144 nd_set_link(nd, target_path);
145 return NULL; /* No cookie */
146 }
148 int
149 cifs_symlink(struct inode *inode, struct dentry *direntry, const char *symname)
150 {
151 int rc = -EOPNOTSUPP;
152 int xid;
153 struct cifs_sb_info *cifs_sb;
154 struct cifsTconInfo *pTcon;
155 char *full_path = NULL;
156 struct inode *newinode = NULL;
158 xid = GetXid();
160 cifs_sb = CIFS_SB(inode->i_sb);
161 pTcon = cifs_sb->tcon;
163 full_path = build_path_from_dentry(direntry);
165 if(full_path == NULL) {
166 FreeXid(xid);
167 return -ENOMEM;
168 }
170 cFYI(1, ("Full path: %s", full_path));
171 cFYI(1, ("symname is %s", symname));
173 /* BB what if DFS and this volume is on different share? BB */
174 if (cifs_sb->tcon->ses->capabilities & CAP_UNIX)
175 rc = CIFSUnixCreateSymLink(xid, pTcon, full_path, symname,
176 cifs_sb->local_nls);
177 /* else
178 rc = CIFSCreateReparseSymLink(xid, pTcon, fromName, toName,cifs_sb_target->local_nls); */
180 if (rc == 0) {
181 if (pTcon->ses->capabilities & CAP_UNIX)
182 rc = cifs_get_inode_info_unix(&newinode, full_path,
183 inode->i_sb,xid);
184 else
185 rc = cifs_get_inode_info(&newinode, full_path, NULL,
186 inode->i_sb,xid);
188 if (rc != 0) {
189 cFYI(1, ("Create symlink ok, getinodeinfo fail rc = %d",
190 rc));
191 } else {
192 if (pTcon->nocase)
193 direntry->d_op = &cifs_ci_dentry_ops;
194 else
195 direntry->d_op = &cifs_dentry_ops;
196 d_instantiate(direntry, newinode);
197 }
198 }
200 kfree(full_path);
201 FreeXid(xid);
202 return rc;
203 }
205 int
206 cifs_readlink(struct dentry *direntry, char __user *pBuffer, int buflen)
207 {
208 struct inode *inode = direntry->d_inode;
209 int rc = -EACCES;
210 int xid;
211 int oplock = FALSE;
212 struct cifs_sb_info *cifs_sb;
213 struct cifsTconInfo *pTcon;
214 char *full_path = NULL;
215 char *tmp_path = NULL;
216 char * tmpbuffer;
217 unsigned char * referrals = NULL;
218 int num_referrals = 0;
219 int len;
220 __u16 fid;
222 xid = GetXid();
223 cifs_sb = CIFS_SB(inode->i_sb);
224 pTcon = cifs_sb->tcon;
226 /* BB would it be safe against deadlock to grab this sem
227 even though rename itself grabs the sem and calls lookup? */
228 /* mutex_lock(&inode->i_sb->s_vfs_rename_mutex);*/
229 full_path = build_path_from_dentry(direntry);
230 /* mutex_unlock(&inode->i_sb->s_vfs_rename_mutex);*/
232 if(full_path == NULL) {
233 FreeXid(xid);
234 return -ENOMEM;
235 }
237 cFYI(1,
238 ("Full path: %s inode = 0x%p pBuffer = 0x%p buflen = %d",
239 full_path, inode, pBuffer, buflen));
240 if(buflen > PATH_MAX)
241 len = PATH_MAX;
242 else
243 len = buflen;
244 tmpbuffer = kmalloc(len,GFP_KERNEL);
245 if(tmpbuffer == NULL) {
246 kfree(full_path);
247 FreeXid(xid);
248 return -ENOMEM;
249 }
251 /* BB add read reparse point symlink code and Unix extensions symlink code here BB */
252 if (cifs_sb->tcon->ses->capabilities & CAP_UNIX)
253 rc = CIFSSMBUnixQuerySymLink(xid, pTcon, full_path,
254 tmpbuffer,
255 len - 1,
256 cifs_sb->local_nls);
257 else {
258 rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN, GENERIC_READ,
259 OPEN_REPARSE_POINT,&fid, &oplock, NULL,
260 cifs_sb->local_nls,
261 cifs_sb->mnt_cifs_flags &
262 CIFS_MOUNT_MAP_SPECIAL_CHR);
263 if(!rc) {
264 rc = CIFSSMBQueryReparseLinkInfo(xid, pTcon, full_path,
265 tmpbuffer,
266 len - 1,
267 fid,
268 cifs_sb->local_nls);
269 if(CIFSSMBClose(xid, pTcon, fid)) {
270 cFYI(1,("Error closing junction point (open for ioctl)"));
271 }
272 if(rc == -EIO) {
273 /* Query if DFS Junction */
274 tmp_path =
275 kmalloc(MAX_TREE_SIZE + MAX_PATHCONF + 1,
276 GFP_KERNEL);
277 if (tmp_path) {
278 strncpy(tmp_path, pTcon->treeName, MAX_TREE_SIZE);
279 strncat(tmp_path, full_path, MAX_PATHCONF);
280 rc = get_dfs_path(xid, pTcon->ses, tmp_path,
281 cifs_sb->local_nls,
282 &num_referrals, &referrals,
283 cifs_sb->mnt_cifs_flags &
284 CIFS_MOUNT_MAP_SPECIAL_CHR);
285 cFYI(1,("Get DFS for %s rc = %d ",tmp_path, rc));
286 if((num_referrals == 0) && (rc == 0))
287 rc = -EACCES;
288 else {
289 cFYI(1,("num referral: %d",num_referrals));
290 if(referrals) {
291 cFYI(1,("referral string: %s",referrals));
292 strncpy(tmpbuffer, referrals, len-1);
293 }
294 }
295 kfree(referrals);
296 kfree(tmp_path);
297 }
298 /* BB add code like else decode referrals then memcpy to
299 tmpbuffer and free referrals string array BB */
300 }
301 }
302 }
303 /* BB Anything else to do to handle recursive links? */
304 /* BB Should we be using page ops here? */
306 /* BB null terminate returned string in pBuffer? BB */
307 if (rc == 0) {
308 rc = vfs_readlink(direntry, pBuffer, len, tmpbuffer);
309 cFYI(1,
310 ("vfs_readlink called from cifs_readlink returned %d",
311 rc));
312 }
314 kfree(tmpbuffer);
315 kfree(full_path);
316 FreeXid(xid);
317 return rc;
318 }
320 void cifs_put_link(struct dentry *direntry, struct nameidata *nd, void *cookie)
321 {
322 char *p = nd_get_link(nd);
323 if (!IS_ERR(p))
324 kfree(p);
325 }