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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * fs/cifs/link.c | |
3 | * | |
366781c1 | 4 | * Copyright (C) International Business Machines Corp., 2002,2008 |
1da177e4 LT |
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); | |
fb8c4b14 | 53 | if ((fromName == NULL) || (toName == NULL)) { |
1da177e4 LT |
54 | rc = -ENOMEM; |
55 | goto cifs_hl_exit; | |
56 | } | |
57 | ||
c18c842b SF |
58 | /* if (cifs_sb_target->tcon->ses->capabilities & CAP_UNIX)*/ |
59 | if (pTcon->unix_ext) | |
1da177e4 | 60 | rc = CIFSUnixCreateHardLink(xid, pTcon, fromName, toName, |
fb8c4b14 | 61 | cifs_sb_target->local_nls, |
737b758c SF |
62 | cifs_sb_target->mnt_cifs_flags & |
63 | CIFS_MOUNT_MAP_SPECIAL_CHR); | |
1da177e4 LT |
64 | else { |
65 | rc = CIFSCreateHardLink(xid, pTcon, fromName, toName, | |
fb8c4b14 | 66 | cifs_sb_target->local_nls, |
737b758c SF |
67 | cifs_sb_target->mnt_cifs_flags & |
68 | CIFS_MOUNT_MAP_SPECIAL_CHR); | |
fb8c4b14 SF |
69 | if ((rc == -EIO) || (rc == -EINVAL)) |
70 | rc = -EOPNOTSUPP; | |
1da177e4 LT |
71 | } |
72 | ||
31ec35d6 SF |
73 | d_drop(direntry); /* force new lookup from server of target */ |
74 | ||
75 | /* if source file is cached (oplocked) revalidate will not go to server | |
76 | until the file is closed or oplock broken so update nlinks locally */ | |
fb8c4b14 | 77 | if (old_file->d_inode) { |
31ec35d6 | 78 | cifsInode = CIFS_I(old_file->d_inode); |
fb8c4b14 | 79 | if (rc == 0) { |
31ec35d6 | 80 | old_file->d_inode->i_nlink++; |
1b2b2126 SF |
81 | /* BB should we make this contingent on superblock flag NOATIME? */ |
82 | /* old_file->d_inode->i_ctime = CURRENT_TIME;*/ | |
31ec35d6 SF |
83 | /* parent dir timestamps will update from srv |
84 | within a second, would it really be worth it | |
85 | to set the parent dir cifs inode time to zero | |
86 | to force revalidate (faster) for it too? */ | |
87 | } | |
fb8c4b14 | 88 | /* if not oplocked will force revalidate to get info |
31ec35d6 SF |
89 | on source file from srv */ |
90 | cifsInode->time = 0; | |
91 | ||
fb8c4b14 | 92 | /* Will update parent dir timestamps from srv within a second. |
31ec35d6 SF |
93 | Would it really be worth it to set the parent dir (cifs |
94 | inode) time field to zero to force revalidate on parent | |
fb8c4b14 | 95 | directory faster ie |
31ec35d6 | 96 | CIFS_I(inode)->time = 0; */ |
1da177e4 | 97 | } |
1da177e4 LT |
98 | |
99 | cifs_hl_exit: | |
f99d49ad JJ |
100 | kfree(fromName); |
101 | kfree(toName); | |
1da177e4 LT |
102 | FreeXid(xid); |
103 | return rc; | |
104 | } | |
105 | ||
cc314eef | 106 | void * |
1da177e4 LT |
107 | cifs_follow_link(struct dentry *direntry, struct nameidata *nd) |
108 | { | |
109 | struct inode *inode = direntry->d_inode; | |
110 | int rc = -EACCES; | |
111 | int xid; | |
112 | char *full_path = NULL; | |
fb8c4b14 | 113 | char *target_path = ERR_PTR(-ENOMEM); |
1da177e4 LT |
114 | struct cifs_sb_info *cifs_sb; |
115 | struct cifsTconInfo *pTcon; | |
116 | ||
117 | xid = GetXid(); | |
118 | ||
7f57356b | 119 | full_path = build_path_from_dentry(direntry); |
1da177e4 LT |
120 | |
121 | if (!full_path) | |
122 | goto out_no_free; | |
123 | ||
124 | cFYI(1, ("Full path: %s inode = 0x%p", full_path, inode)); | |
7f57356b SF |
125 | cifs_sb = CIFS_SB(inode->i_sb); |
126 | pTcon = cifs_sb->tcon; | |
1da177e4 LT |
127 | target_path = kmalloc(PATH_MAX, GFP_KERNEL); |
128 | if (!target_path) { | |
129 | target_path = ERR_PTR(-ENOMEM); | |
130 | goto out; | |
131 | } | |
132 | ||
c18c842b SF |
133 | /* We could change this to: |
134 | if (pTcon->unix_ext) | |
135 | but there does not seem any point in refusing to | |
136 | get symlink info if we can, even if unix extensions | |
137 | turned off for this mount */ | |
138 | ||
1da177e4 LT |
139 | if (pTcon->ses->capabilities & CAP_UNIX) |
140 | rc = CIFSSMBUnixQuerySymLink(xid, pTcon, full_path, | |
141 | target_path, | |
142 | PATH_MAX-1, | |
143 | cifs_sb->local_nls); | |
144 | else { | |
c18c842b | 145 | /* BB add read reparse point symlink code here */ |
1da177e4 LT |
146 | /* rc = CIFSSMBQueryReparseLinkInfo */ |
147 | /* BB Add code to Query ReparsePoint info */ | |
148 | /* BB Add MAC style xsymlink check here if enabled */ | |
149 | } | |
150 | ||
151 | if (rc == 0) { | |
152 | ||
153 | /* BB Add special case check for Samba DFS symlinks */ | |
154 | ||
155 | target_path[PATH_MAX-1] = 0; | |
156 | } else { | |
157 | kfree(target_path); | |
158 | target_path = ERR_PTR(rc); | |
159 | } | |
160 | ||
161 | out: | |
162 | kfree(full_path); | |
163 | out_no_free: | |
164 | FreeXid(xid); | |
165 | nd_set_link(nd, target_path); | |
cc314eef | 166 | return NULL; /* No cookie */ |
1da177e4 LT |
167 | } |
168 | ||
169 | int | |
170 | cifs_symlink(struct inode *inode, struct dentry *direntry, const char *symname) | |
171 | { | |
172 | int rc = -EOPNOTSUPP; | |
173 | int xid; | |
174 | struct cifs_sb_info *cifs_sb; | |
175 | struct cifsTconInfo *pTcon; | |
176 | char *full_path = NULL; | |
177 | struct inode *newinode = NULL; | |
178 | ||
179 | xid = GetXid(); | |
180 | ||
181 | cifs_sb = CIFS_SB(inode->i_sb); | |
182 | pTcon = cifs_sb->tcon; | |
183 | ||
7f57356b | 184 | full_path = build_path_from_dentry(direntry); |
1da177e4 | 185 | |
fb8c4b14 | 186 | if (full_path == NULL) { |
1da177e4 LT |
187 | FreeXid(xid); |
188 | return -ENOMEM; | |
189 | } | |
190 | ||
26a21b98 | 191 | cFYI(1, ("Full path: %s", full_path)); |
1da177e4 LT |
192 | cFYI(1, ("symname is %s", symname)); |
193 | ||
194 | /* BB what if DFS and this volume is on different share? BB */ | |
c18c842b | 195 | if (pTcon->unix_ext) |
1da177e4 LT |
196 | rc = CIFSUnixCreateSymLink(xid, pTcon, full_path, symname, |
197 | cifs_sb->local_nls); | |
198 | /* else | |
fb8c4b14 SF |
199 | rc = CIFSCreateReparseSymLink(xid, pTcon, fromName, toName, |
200 | cifs_sb_target->local_nls); */ | |
1da177e4 LT |
201 | |
202 | if (rc == 0) { | |
c18c842b | 203 | if (pTcon->unix_ext) |
1da177e4 | 204 | rc = cifs_get_inode_info_unix(&newinode, full_path, |
fb8c4b14 | 205 | inode->i_sb, xid); |
1da177e4 LT |
206 | else |
207 | rc = cifs_get_inode_info(&newinode, full_path, NULL, | |
8b1327f6 | 208 | inode->i_sb, xid, NULL); |
1da177e4 LT |
209 | |
210 | if (rc != 0) { | |
26a21b98 | 211 | cFYI(1, ("Create symlink ok, getinodeinfo fail rc = %d", |
1da177e4 LT |
212 | rc)); |
213 | } else { | |
b92327fe SF |
214 | if (pTcon->nocase) |
215 | direntry->d_op = &cifs_ci_dentry_ops; | |
216 | else | |
217 | direntry->d_op = &cifs_dentry_ops; | |
1da177e4 LT |
218 | d_instantiate(direntry, newinode); |
219 | } | |
220 | } | |
221 | ||
f99d49ad | 222 | kfree(full_path); |
1da177e4 LT |
223 | FreeXid(xid); |
224 | return rc; | |
225 | } | |
226 | ||
227 | int | |
228 | cifs_readlink(struct dentry *direntry, char __user *pBuffer, int buflen) | |
229 | { | |
230 | struct inode *inode = direntry->d_inode; | |
231 | int rc = -EACCES; | |
232 | int xid; | |
4b18f2a9 | 233 | int oplock = 0; |
1da177e4 LT |
234 | struct cifs_sb_info *cifs_sb; |
235 | struct cifsTconInfo *pTcon; | |
236 | char *full_path = NULL; | |
fb8c4b14 | 237 | char *tmpbuffer; |
1da177e4 LT |
238 | int len; |
239 | __u16 fid; | |
240 | ||
241 | xid = GetXid(); | |
242 | cifs_sb = CIFS_SB(inode->i_sb); | |
243 | pTcon = cifs_sb->tcon; | |
244 | ||
fb8c4b14 | 245 | /* BB would it be safe against deadlock to grab this sem |
1da177e4 | 246 | even though rename itself grabs the sem and calls lookup? */ |
a11f3a05 | 247 | /* mutex_lock(&inode->i_sb->s_vfs_rename_mutex);*/ |
7f57356b | 248 | full_path = build_path_from_dentry(direntry); |
a11f3a05 | 249 | /* mutex_unlock(&inode->i_sb->s_vfs_rename_mutex);*/ |
1da177e4 | 250 | |
fb8c4b14 | 251 | if (full_path == NULL) { |
1da177e4 LT |
252 | FreeXid(xid); |
253 | return -ENOMEM; | |
254 | } | |
255 | ||
256 | cFYI(1, | |
257 | ("Full path: %s inode = 0x%p pBuffer = 0x%p buflen = %d", | |
258 | full_path, inode, pBuffer, buflen)); | |
fb8c4b14 | 259 | if (buflen > PATH_MAX) |
1da177e4 LT |
260 | len = PATH_MAX; |
261 | else | |
262 | len = buflen; | |
fb8c4b14 SF |
263 | tmpbuffer = kmalloc(len, GFP_KERNEL); |
264 | if (tmpbuffer == NULL) { | |
f99d49ad | 265 | kfree(full_path); |
1da177e4 LT |
266 | FreeXid(xid); |
267 | return -ENOMEM; | |
268 | } | |
269 | ||
fb8c4b14 SF |
270 | /* BB add read reparse point symlink code and |
271 | Unix extensions symlink code here BB */ | |
c18c842b | 272 | /* We could disable this based on pTcon->unix_ext flag instead ... but why? */ |
1da177e4 LT |
273 | if (cifs_sb->tcon->ses->capabilities & CAP_UNIX) |
274 | rc = CIFSSMBUnixQuerySymLink(xid, pTcon, full_path, | |
275 | tmpbuffer, | |
276 | len - 1, | |
277 | cifs_sb->local_nls); | |
1bd5bbcb | 278 | else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) { |
fb8c4b14 | 279 | cERROR(1, ("SFU style symlinks not implemented yet")); |
1bd5bbcb | 280 | /* add open and read as in fs/cifs/inode.c */ |
1bd5bbcb | 281 | } else { |
1da177e4 | 282 | rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN, GENERIC_READ, |
fb8c4b14 SF |
283 | OPEN_REPARSE_POINT, &fid, &oplock, NULL, |
284 | cifs_sb->local_nls, | |
285 | cifs_sb->mnt_cifs_flags & | |
737b758c | 286 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
fb8c4b14 | 287 | if (!rc) { |
1da177e4 LT |
288 | rc = CIFSSMBQueryReparseLinkInfo(xid, pTcon, full_path, |
289 | tmpbuffer, | |
fb8c4b14 | 290 | len - 1, |
1da177e4 LT |
291 | fid, |
292 | cifs_sb->local_nls); | |
fb8c4b14 | 293 | if (CIFSSMBClose(xid, pTcon, fid)) { |
63135e08 SF |
294 | cFYI(1, ("Error closing junction point " |
295 | "(open for ioctl)")); | |
1da177e4 | 296 | } |
646dd539 SF |
297 | /* If it is a DFS junction earlier we would have gotten |
298 | PATH_NOT_COVERED returned from server so we do | |
299 | not need to request the DFS info here */ | |
1da177e4 LT |
300 | } |
301 | } | |
302 | /* BB Anything else to do to handle recursive links? */ | |
303 | /* BB Should we be using page ops here? */ | |
304 | ||
305 | /* BB null terminate returned string in pBuffer? BB */ | |
306 | if (rc == 0) { | |
307 | rc = vfs_readlink(direntry, pBuffer, len, tmpbuffer); | |
308 | cFYI(1, | |
309 | ("vfs_readlink called from cifs_readlink returned %d", | |
310 | rc)); | |
311 | } | |
312 | ||
f99d49ad JJ |
313 | kfree(tmpbuffer); |
314 | kfree(full_path); | |
1da177e4 LT |
315 | FreeXid(xid); |
316 | return rc; | |
317 | } | |
318 | ||
cc314eef | 319 | void cifs_put_link(struct dentry *direntry, struct nameidata *nd, void *cookie) |
1da177e4 LT |
320 | { |
321 | char *p = nd_get_link(nd); | |
322 | if (!IS_ERR(p)) | |
323 | kfree(p); | |
324 | } |