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1da177e4 LT |
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" | |
30 | ||
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; | |
42 | ||
43 | xid = GetXid(); | |
44 | ||
45 | cifs_sb_target = CIFS_SB(inode->i_sb); | |
46 | pTcon = cifs_sb_target->tcon; | |
47 | ||
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) */ | |
50 | ||
7f57356b SF |
51 | fromName = build_path_from_dentry(old_file); |
52 | toName = build_path_from_dentry(direntry); | |
1da177e4 LT |
53 | if((fromName == NULL) || (toName == NULL)) { |
54 | rc = -ENOMEM; | |
55 | goto cifs_hl_exit; | |
56 | } | |
57 | ||
58 | if (cifs_sb_target->tcon->ses->capabilities & CAP_UNIX) | |
59 | rc = CIFSUnixCreateHardLink(xid, pTcon, fromName, toName, | |
737b758c SF |
60 | cifs_sb_target->local_nls, |
61 | cifs_sb_target->mnt_cifs_flags & | |
62 | CIFS_MOUNT_MAP_SPECIAL_CHR); | |
1da177e4 LT |
63 | else { |
64 | rc = CIFSCreateHardLink(xid, pTcon, fromName, toName, | |
737b758c SF |
65 | cifs_sb_target->local_nls, |
66 | cifs_sb_target->mnt_cifs_flags & | |
67 | CIFS_MOUNT_MAP_SPECIAL_CHR); | |
083d3a2c | 68 | if((rc == -EIO) || (rc == -EINVAL)) |
1da177e4 LT |
69 | rc = -EOPNOTSUPP; |
70 | } | |
71 | ||
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 */ | |
83 | ||
84 | cifs_hl_exit: | |
f99d49ad JJ |
85 | kfree(fromName); |
86 | kfree(toName); | |
1da177e4 LT |
87 | FreeXid(xid); |
88 | return rc; | |
89 | } | |
90 | ||
cc314eef | 91 | void * |
1da177e4 LT |
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; | |
101 | ||
102 | xid = GetXid(); | |
103 | ||
7f57356b | 104 | full_path = build_path_from_dentry(direntry); |
1da177e4 LT |
105 | |
106 | if (!full_path) | |
107 | goto out_no_free; | |
108 | ||
109 | cFYI(1, ("Full path: %s inode = 0x%p", full_path, inode)); | |
7f57356b SF |
110 | cifs_sb = CIFS_SB(inode->i_sb); |
111 | pTcon = cifs_sb->tcon; | |
1da177e4 LT |
112 | target_path = kmalloc(PATH_MAX, GFP_KERNEL); |
113 | if (!target_path) { | |
114 | target_path = ERR_PTR(-ENOMEM); | |
115 | goto out; | |
116 | } | |
117 | ||
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 | } | |
129 | ||
130 | if (rc == 0) { | |
131 | ||
132 | /* BB Add special case check for Samba DFS symlinks */ | |
133 | ||
134 | target_path[PATH_MAX-1] = 0; | |
135 | } else { | |
136 | kfree(target_path); | |
137 | target_path = ERR_PTR(rc); | |
138 | } | |
139 | ||
140 | out: | |
141 | kfree(full_path); | |
142 | out_no_free: | |
143 | FreeXid(xid); | |
144 | nd_set_link(nd, target_path); | |
cc314eef | 145 | return NULL; /* No cookie */ |
1da177e4 LT |
146 | } |
147 | ||
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; | |
157 | ||
158 | xid = GetXid(); | |
159 | ||
160 | cifs_sb = CIFS_SB(inode->i_sb); | |
161 | pTcon = cifs_sb->tcon; | |
162 | ||
7f57356b | 163 | full_path = build_path_from_dentry(direntry); |
1da177e4 LT |
164 | |
165 | if(full_path == NULL) { | |
166 | FreeXid(xid); | |
167 | return -ENOMEM; | |
168 | } | |
169 | ||
26a21b98 | 170 | cFYI(1, ("Full path: %s", full_path)); |
1da177e4 LT |
171 | cFYI(1, ("symname is %s", symname)); |
172 | ||
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); */ | |
179 | ||
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); | |
187 | ||
188 | if (rc != 0) { | |
26a21b98 | 189 | cFYI(1, ("Create symlink ok, getinodeinfo fail rc = %d", |
1da177e4 LT |
190 | rc)); |
191 | } else { | |
b92327fe SF |
192 | if (pTcon->nocase) |
193 | direntry->d_op = &cifs_ci_dentry_ops; | |
194 | else | |
195 | direntry->d_op = &cifs_dentry_ops; | |
1da177e4 LT |
196 | d_instantiate(direntry, newinode); |
197 | } | |
198 | } | |
199 | ||
f99d49ad | 200 | kfree(full_path); |
1da177e4 LT |
201 | FreeXid(xid); |
202 | return rc; | |
203 | } | |
204 | ||
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; | |
221 | ||
222 | xid = GetXid(); | |
223 | cifs_sb = CIFS_SB(inode->i_sb); | |
224 | pTcon = cifs_sb->tcon; | |
225 | ||
226 | /* BB would it be safe against deadlock to grab this sem | |
227 | even though rename itself grabs the sem and calls lookup? */ | |
a11f3a05 | 228 | /* mutex_lock(&inode->i_sb->s_vfs_rename_mutex);*/ |
7f57356b | 229 | full_path = build_path_from_dentry(direntry); |
a11f3a05 | 230 | /* mutex_unlock(&inode->i_sb->s_vfs_rename_mutex);*/ |
1da177e4 LT |
231 | |
232 | if(full_path == NULL) { | |
233 | FreeXid(xid); | |
234 | return -ENOMEM; | |
235 | } | |
236 | ||
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) { | |
f99d49ad | 246 | kfree(full_path); |
1da177e4 LT |
247 | FreeXid(xid); |
248 | return -ENOMEM; | |
249 | } | |
250 | ||
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, | |
737b758c SF |
259 | OPEN_REPARSE_POINT,&fid, &oplock, NULL, |
260 | cifs_sb->local_nls, | |
261 | cifs_sb->mnt_cifs_flags & | |
262 | CIFS_MOUNT_MAP_SPECIAL_CHR); | |
1da177e4 LT |
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, | |
737b758c SF |
281 | cifs_sb->local_nls, |
282 | &num_referrals, &referrals, | |
283 | cifs_sb->mnt_cifs_flags & | |
284 | CIFS_MOUNT_MAP_SPECIAL_CHR); | |
1da177e4 LT |
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) { | |
26a21b98 | 291 | cFYI(1,("referral string: %s",referrals)); |
1da177e4 LT |
292 | strncpy(tmpbuffer, referrals, len-1); |
293 | } | |
294 | } | |
f99d49ad | 295 | kfree(referrals); |
1da177e4 LT |
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? */ | |
305 | ||
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 | } | |
313 | ||
f99d49ad JJ |
314 | kfree(tmpbuffer); |
315 | kfree(full_path); | |
1da177e4 LT |
316 | FreeXid(xid); |
317 | return rc; | |
318 | } | |
319 | ||
cc314eef | 320 | void cifs_put_link(struct dentry *direntry, struct nameidata *nd, void *cookie) |
1da177e4 LT |
321 | { |
322 | char *p = nd_get_link(nd); | |
323 | if (!IS_ERR(p)) | |
324 | kfree(p); | |
325 | } |