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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 | ||
51 | down(&inode->i_sb->s_vfs_rename_sem); | |
ac67055e JA |
52 | fromName = build_path_from_dentry(old_file, cifs_sb_target); |
53 | toName = build_path_from_dentry(direntry, cifs_sb_target); | |
1da177e4 LT |
54 | up(&inode->i_sb->s_vfs_rename_sem); |
55 | if((fromName == NULL) || (toName == NULL)) { | |
56 | rc = -ENOMEM; | |
57 | goto cifs_hl_exit; | |
58 | } | |
59 | ||
60 | if (cifs_sb_target->tcon->ses->capabilities & CAP_UNIX) | |
61 | rc = CIFSUnixCreateHardLink(xid, pTcon, fromName, toName, | |
737b758c SF |
62 | cifs_sb_target->local_nls, |
63 | cifs_sb_target->mnt_cifs_flags & | |
64 | CIFS_MOUNT_MAP_SPECIAL_CHR); | |
1da177e4 LT |
65 | else { |
66 | rc = CIFSCreateHardLink(xid, pTcon, fromName, toName, | |
737b758c SF |
67 | cifs_sb_target->local_nls, |
68 | cifs_sb_target->mnt_cifs_flags & | |
69 | CIFS_MOUNT_MAP_SPECIAL_CHR); | |
1da177e4 LT |
70 | if(rc == -EIO) |
71 | rc = -EOPNOTSUPP; | |
72 | } | |
73 | ||
74 | /* if (!rc) */ | |
75 | { | |
76 | /* renew_parental_timestamps(old_file); | |
77 | inode->i_nlink++; | |
78 | mark_inode_dirty(inode); | |
79 | d_instantiate(direntry, inode); */ | |
80 | /* BB add call to either mark inode dirty or refresh its data and timestamp to current time */ | |
81 | } | |
82 | d_drop(direntry); /* force new lookup from server */ | |
83 | cifsInode = CIFS_I(old_file->d_inode); | |
84 | cifsInode->time = 0; /* will force revalidate to go get info when needed */ | |
85 | ||
86 | cifs_hl_exit: | |
87 | if (fromName) | |
88 | kfree(fromName); | |
89 | if (toName) | |
90 | kfree(toName); | |
91 | FreeXid(xid); | |
92 | return rc; | |
93 | } | |
94 | ||
95 | int | |
96 | cifs_follow_link(struct dentry *direntry, struct nameidata *nd) | |
97 | { | |
98 | struct inode *inode = direntry->d_inode; | |
99 | int rc = -EACCES; | |
100 | int xid; | |
101 | char *full_path = NULL; | |
102 | char * target_path = ERR_PTR(-ENOMEM); | |
103 | struct cifs_sb_info *cifs_sb; | |
104 | struct cifsTconInfo *pTcon; | |
105 | ||
106 | xid = GetXid(); | |
107 | ||
ac67055e JA |
108 | cifs_sb = CIFS_SB(inode->i_sb); |
109 | pTcon = cifs_sb->tcon; | |
110 | ||
1da177e4 | 111 | down(&direntry->d_sb->s_vfs_rename_sem); |
ac67055e | 112 | full_path = build_path_from_dentry(direntry, cifs_sb); |
1da177e4 LT |
113 | up(&direntry->d_sb->s_vfs_rename_sem); |
114 | ||
115 | if (!full_path) | |
116 | goto out_no_free; | |
117 | ||
118 | cFYI(1, ("Full path: %s inode = 0x%p", full_path, inode)); | |
1da177e4 LT |
119 | target_path = kmalloc(PATH_MAX, GFP_KERNEL); |
120 | if (!target_path) { | |
121 | target_path = ERR_PTR(-ENOMEM); | |
122 | goto out; | |
123 | } | |
124 | ||
125 | /* BB add read reparse point symlink code and Unix extensions symlink code here BB */ | |
126 | if (pTcon->ses->capabilities & CAP_UNIX) | |
127 | rc = CIFSSMBUnixQuerySymLink(xid, pTcon, full_path, | |
128 | target_path, | |
129 | PATH_MAX-1, | |
130 | cifs_sb->local_nls); | |
131 | else { | |
132 | /* rc = CIFSSMBQueryReparseLinkInfo */ | |
133 | /* BB Add code to Query ReparsePoint info */ | |
134 | /* BB Add MAC style xsymlink check here if enabled */ | |
135 | } | |
136 | ||
137 | if (rc == 0) { | |
138 | ||
139 | /* BB Add special case check for Samba DFS symlinks */ | |
140 | ||
141 | target_path[PATH_MAX-1] = 0; | |
142 | } else { | |
143 | kfree(target_path); | |
144 | target_path = ERR_PTR(rc); | |
145 | } | |
146 | ||
147 | out: | |
148 | kfree(full_path); | |
149 | out_no_free: | |
150 | FreeXid(xid); | |
151 | nd_set_link(nd, target_path); | |
152 | return 0; | |
153 | } | |
154 | ||
155 | int | |
156 | cifs_symlink(struct inode *inode, struct dentry *direntry, const char *symname) | |
157 | { | |
158 | int rc = -EOPNOTSUPP; | |
159 | int xid; | |
160 | struct cifs_sb_info *cifs_sb; | |
161 | struct cifsTconInfo *pTcon; | |
162 | char *full_path = NULL; | |
163 | struct inode *newinode = NULL; | |
164 | ||
165 | xid = GetXid(); | |
166 | ||
167 | cifs_sb = CIFS_SB(inode->i_sb); | |
168 | pTcon = cifs_sb->tcon; | |
169 | ||
170 | down(&inode->i_sb->s_vfs_rename_sem); | |
ac67055e | 171 | full_path = build_path_from_dentry(direntry, cifs_sb); |
1da177e4 LT |
172 | up(&inode->i_sb->s_vfs_rename_sem); |
173 | ||
174 | if(full_path == NULL) { | |
175 | FreeXid(xid); | |
176 | return -ENOMEM; | |
177 | } | |
178 | ||
179 | cFYI(1, ("Full path: %s ", full_path)); | |
180 | cFYI(1, ("symname is %s", symname)); | |
181 | ||
182 | /* BB what if DFS and this volume is on different share? BB */ | |
183 | if (cifs_sb->tcon->ses->capabilities & CAP_UNIX) | |
184 | rc = CIFSUnixCreateSymLink(xid, pTcon, full_path, symname, | |
185 | cifs_sb->local_nls); | |
186 | /* else | |
187 | rc = CIFSCreateReparseSymLink(xid, pTcon, fromName, toName,cifs_sb_target->local_nls); */ | |
188 | ||
189 | if (rc == 0) { | |
190 | if (pTcon->ses->capabilities & CAP_UNIX) | |
191 | rc = cifs_get_inode_info_unix(&newinode, full_path, | |
192 | inode->i_sb,xid); | |
193 | else | |
194 | rc = cifs_get_inode_info(&newinode, full_path, NULL, | |
195 | inode->i_sb,xid); | |
196 | ||
197 | if (rc != 0) { | |
198 | cFYI(1, | |
199 | ("Create symlink worked but get_inode_info failed with rc = %d ", | |
200 | rc)); | |
201 | } else { | |
202 | direntry->d_op = &cifs_dentry_ops; | |
203 | d_instantiate(direntry, newinode); | |
204 | } | |
205 | } | |
206 | ||
207 | if (full_path) | |
208 | kfree(full_path); | |
209 | FreeXid(xid); | |
210 | return rc; | |
211 | } | |
212 | ||
213 | int | |
214 | cifs_readlink(struct dentry *direntry, char __user *pBuffer, int buflen) | |
215 | { | |
216 | struct inode *inode = direntry->d_inode; | |
217 | int rc = -EACCES; | |
218 | int xid; | |
219 | int oplock = FALSE; | |
220 | struct cifs_sb_info *cifs_sb; | |
221 | struct cifsTconInfo *pTcon; | |
222 | char *full_path = NULL; | |
223 | char *tmp_path = NULL; | |
224 | char * tmpbuffer; | |
225 | unsigned char * referrals = NULL; | |
226 | int num_referrals = 0; | |
227 | int len; | |
228 | __u16 fid; | |
229 | ||
230 | xid = GetXid(); | |
231 | cifs_sb = CIFS_SB(inode->i_sb); | |
232 | pTcon = cifs_sb->tcon; | |
233 | ||
234 | /* BB would it be safe against deadlock to grab this sem | |
235 | even though rename itself grabs the sem and calls lookup? */ | |
236 | /* down(&inode->i_sb->s_vfs_rename_sem);*/ | |
ac67055e | 237 | full_path = build_path_from_dentry(direntry, cifs_sb); |
1da177e4 LT |
238 | /* up(&inode->i_sb->s_vfs_rename_sem);*/ |
239 | ||
240 | if(full_path == NULL) { | |
241 | FreeXid(xid); | |
242 | return -ENOMEM; | |
243 | } | |
244 | ||
245 | cFYI(1, | |
246 | ("Full path: %s inode = 0x%p pBuffer = 0x%p buflen = %d", | |
247 | full_path, inode, pBuffer, buflen)); | |
248 | if(buflen > PATH_MAX) | |
249 | len = PATH_MAX; | |
250 | else | |
251 | len = buflen; | |
252 | tmpbuffer = kmalloc(len,GFP_KERNEL); | |
253 | if(tmpbuffer == NULL) { | |
254 | if (full_path) | |
255 | kfree(full_path); | |
256 | FreeXid(xid); | |
257 | return -ENOMEM; | |
258 | } | |
259 | ||
260 | /* BB add read reparse point symlink code and Unix extensions symlink code here BB */ | |
261 | if (cifs_sb->tcon->ses->capabilities & CAP_UNIX) | |
262 | rc = CIFSSMBUnixQuerySymLink(xid, pTcon, full_path, | |
263 | tmpbuffer, | |
264 | len - 1, | |
265 | cifs_sb->local_nls); | |
266 | else { | |
267 | rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN, GENERIC_READ, | |
737b758c SF |
268 | OPEN_REPARSE_POINT,&fid, &oplock, NULL, |
269 | cifs_sb->local_nls, | |
270 | cifs_sb->mnt_cifs_flags & | |
271 | CIFS_MOUNT_MAP_SPECIAL_CHR); | |
1da177e4 LT |
272 | if(!rc) { |
273 | rc = CIFSSMBQueryReparseLinkInfo(xid, pTcon, full_path, | |
274 | tmpbuffer, | |
275 | len - 1, | |
276 | fid, | |
277 | cifs_sb->local_nls); | |
278 | if(CIFSSMBClose(xid, pTcon, fid)) { | |
279 | cFYI(1,("Error closing junction point (open for ioctl)")); | |
280 | } | |
281 | if(rc == -EIO) { | |
282 | /* Query if DFS Junction */ | |
283 | tmp_path = | |
284 | kmalloc(MAX_TREE_SIZE + MAX_PATHCONF + 1, | |
285 | GFP_KERNEL); | |
286 | if (tmp_path) { | |
287 | strncpy(tmp_path, pTcon->treeName, MAX_TREE_SIZE); | |
288 | strncat(tmp_path, full_path, MAX_PATHCONF); | |
289 | rc = get_dfs_path(xid, pTcon->ses, tmp_path, | |
737b758c SF |
290 | cifs_sb->local_nls, |
291 | &num_referrals, &referrals, | |
292 | cifs_sb->mnt_cifs_flags & | |
293 | CIFS_MOUNT_MAP_SPECIAL_CHR); | |
1da177e4 LT |
294 | cFYI(1,("Get DFS for %s rc = %d ",tmp_path, rc)); |
295 | if((num_referrals == 0) && (rc == 0)) | |
296 | rc = -EACCES; | |
297 | else { | |
298 | cFYI(1,("num referral: %d",num_referrals)); | |
299 | if(referrals) { | |
300 | cFYI(1,("referral string: %s ",referrals)); | |
301 | strncpy(tmpbuffer, referrals, len-1); | |
302 | } | |
303 | } | |
304 | if(referrals) | |
305 | kfree(referrals); | |
306 | kfree(tmp_path); | |
307 | } | |
308 | /* BB add code like else decode referrals then memcpy to | |
309 | tmpbuffer and free referrals string array BB */ | |
310 | } | |
311 | } | |
312 | } | |
313 | /* BB Anything else to do to handle recursive links? */ | |
314 | /* BB Should we be using page ops here? */ | |
315 | ||
316 | /* BB null terminate returned string in pBuffer? BB */ | |
317 | if (rc == 0) { | |
318 | rc = vfs_readlink(direntry, pBuffer, len, tmpbuffer); | |
319 | cFYI(1, | |
320 | ("vfs_readlink called from cifs_readlink returned %d", | |
321 | rc)); | |
322 | } | |
323 | ||
324 | if (tmpbuffer) { | |
325 | kfree(tmpbuffer); | |
326 | } | |
327 | if (full_path) { | |
328 | kfree(full_path); | |
329 | } | |
330 | FreeXid(xid); | |
331 | return rc; | |
332 | } | |
333 | ||
334 | void cifs_put_link(struct dentry *direntry, struct nameidata *nd) | |
335 | { | |
336 | char *p = nd_get_link(nd); | |
337 | if (!IS_ERR(p)) | |
338 | kfree(p); | |
339 | } |