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> | |
5a0e3ad6 | 23 | #include <linux/slab.h> |
1da177e4 LT |
24 | #include <linux/namei.h> |
25 | #include "cifsfs.h" | |
26 | #include "cifspdu.h" | |
27 | #include "cifsglob.h" | |
28 | #include "cifsproto.h" | |
29 | #include "cifs_debug.h" | |
30 | #include "cifs_fs_sb.h" | |
31 | ||
32 | int | |
33 | cifs_hardlink(struct dentry *old_file, struct inode *inode, | |
34 | struct dentry *direntry) | |
35 | { | |
36 | int rc = -EACCES; | |
37 | int xid; | |
38 | char *fromName = NULL; | |
39 | char *toName = NULL; | |
40 | struct cifs_sb_info *cifs_sb_target; | |
41 | struct cifsTconInfo *pTcon; | |
42 | struct cifsInodeInfo *cifsInode; | |
43 | ||
44 | xid = GetXid(); | |
45 | ||
46 | cifs_sb_target = CIFS_SB(inode->i_sb); | |
47 | pTcon = cifs_sb_target->tcon; | |
48 | ||
49 | /* No need to check for cross device links since server will do that | |
50 | BB note DFS case in future though (when we may have to check) */ | |
51 | ||
7f57356b SF |
52 | fromName = build_path_from_dentry(old_file); |
53 | toName = build_path_from_dentry(direntry); | |
fb8c4b14 | 54 | if ((fromName == NULL) || (toName == NULL)) { |
1da177e4 LT |
55 | rc = -ENOMEM; |
56 | goto cifs_hl_exit; | |
57 | } | |
58 | ||
c18c842b SF |
59 | /* if (cifs_sb_target->tcon->ses->capabilities & CAP_UNIX)*/ |
60 | if (pTcon->unix_ext) | |
1da177e4 | 61 | rc = CIFSUnixCreateHardLink(xid, pTcon, fromName, toName, |
fb8c4b14 | 62 | cifs_sb_target->local_nls, |
737b758c SF |
63 | cifs_sb_target->mnt_cifs_flags & |
64 | CIFS_MOUNT_MAP_SPECIAL_CHR); | |
1da177e4 LT |
65 | else { |
66 | rc = CIFSCreateHardLink(xid, pTcon, fromName, toName, | |
fb8c4b14 | 67 | cifs_sb_target->local_nls, |
737b758c SF |
68 | cifs_sb_target->mnt_cifs_flags & |
69 | CIFS_MOUNT_MAP_SPECIAL_CHR); | |
fb8c4b14 SF |
70 | if ((rc == -EIO) || (rc == -EINVAL)) |
71 | rc = -EOPNOTSUPP; | |
1da177e4 LT |
72 | } |
73 | ||
31ec35d6 SF |
74 | d_drop(direntry); /* force new lookup from server of target */ |
75 | ||
76 | /* if source file is cached (oplocked) revalidate will not go to server | |
77 | until the file is closed or oplock broken so update nlinks locally */ | |
fb8c4b14 | 78 | if (old_file->d_inode) { |
31ec35d6 | 79 | cifsInode = CIFS_I(old_file->d_inode); |
fb8c4b14 | 80 | if (rc == 0) { |
31ec35d6 | 81 | old_file->d_inode->i_nlink++; |
1b2b2126 SF |
82 | /* BB should we make this contingent on superblock flag NOATIME? */ |
83 | /* old_file->d_inode->i_ctime = CURRENT_TIME;*/ | |
31ec35d6 SF |
84 | /* parent dir timestamps will update from srv |
85 | within a second, would it really be worth it | |
86 | to set the parent dir cifs inode time to zero | |
87 | to force revalidate (faster) for it too? */ | |
88 | } | |
fb8c4b14 | 89 | /* if not oplocked will force revalidate to get info |
31ec35d6 SF |
90 | on source file from srv */ |
91 | cifsInode->time = 0; | |
92 | ||
fb8c4b14 | 93 | /* Will update parent dir timestamps from srv within a second. |
31ec35d6 SF |
94 | Would it really be worth it to set the parent dir (cifs |
95 | inode) time field to zero to force revalidate on parent | |
fb8c4b14 | 96 | directory faster ie |
31ec35d6 | 97 | CIFS_I(inode)->time = 0; */ |
1da177e4 | 98 | } |
1da177e4 LT |
99 | |
100 | cifs_hl_exit: | |
f99d49ad JJ |
101 | kfree(fromName); |
102 | kfree(toName); | |
1da177e4 LT |
103 | FreeXid(xid); |
104 | return rc; | |
105 | } | |
106 | ||
cc314eef | 107 | void * |
1da177e4 LT |
108 | cifs_follow_link(struct dentry *direntry, struct nameidata *nd) |
109 | { | |
110 | struct inode *inode = direntry->d_inode; | |
8b6427a2 | 111 | int rc = -ENOMEM; |
1da177e4 LT |
112 | int xid; |
113 | char *full_path = NULL; | |
8b6427a2 JL |
114 | char *target_path = NULL; |
115 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); | |
116 | struct cifsTconInfo *tcon = cifs_sb->tcon; | |
1da177e4 LT |
117 | |
118 | xid = GetXid(); | |
119 | ||
8b6427a2 JL |
120 | /* |
121 | * For now, we just handle symlinks with unix extensions enabled. | |
122 | * Eventually we should handle NTFS reparse points, and MacOS | |
123 | * symlink support. For instance... | |
124 | * | |
125 | * rc = CIFSSMBQueryReparseLinkInfo(...) | |
126 | * | |
127 | * For now, just return -EACCES when the server doesn't support posix | |
128 | * extensions. Note that we still allow querying symlinks when posix | |
129 | * extensions are manually disabled. We could disable these as well | |
130 | * but there doesn't seem to be any harm in allowing the client to | |
131 | * read them. | |
132 | */ | |
133 | if (!(tcon->ses->capabilities & CAP_UNIX)) { | |
134 | rc = -EACCES; | |
135 | goto out; | |
136 | } | |
1da177e4 | 137 | |
8b6427a2 | 138 | full_path = build_path_from_dentry(direntry); |
1da177e4 | 139 | if (!full_path) |
460b9696 | 140 | goto out; |
1da177e4 LT |
141 | |
142 | cFYI(1, ("Full path: %s inode = 0x%p", full_path, inode)); | |
1da177e4 | 143 | |
8b6427a2 JL |
144 | rc = CIFSSMBUnixQuerySymLink(xid, tcon, full_path, &target_path, |
145 | cifs_sb->local_nls); | |
146 | kfree(full_path); | |
147 | out: | |
460b9696 | 148 | if (rc != 0) { |
1da177e4 LT |
149 | kfree(target_path); |
150 | target_path = ERR_PTR(rc); | |
151 | } | |
152 | ||
1da177e4 LT |
153 | FreeXid(xid); |
154 | nd_set_link(nd, target_path); | |
460b9696 | 155 | return NULL; |
1da177e4 LT |
156 | } |
157 | ||
158 | int | |
159 | cifs_symlink(struct inode *inode, struct dentry *direntry, const char *symname) | |
160 | { | |
161 | int rc = -EOPNOTSUPP; | |
162 | int xid; | |
163 | struct cifs_sb_info *cifs_sb; | |
164 | struct cifsTconInfo *pTcon; | |
165 | char *full_path = NULL; | |
166 | struct inode *newinode = NULL; | |
167 | ||
168 | xid = GetXid(); | |
169 | ||
170 | cifs_sb = CIFS_SB(inode->i_sb); | |
171 | pTcon = cifs_sb->tcon; | |
172 | ||
7f57356b | 173 | full_path = build_path_from_dentry(direntry); |
1da177e4 | 174 | |
fb8c4b14 | 175 | if (full_path == NULL) { |
0f3bc09e | 176 | rc = -ENOMEM; |
1da177e4 | 177 | FreeXid(xid); |
0f3bc09e | 178 | return rc; |
1da177e4 LT |
179 | } |
180 | ||
26a21b98 | 181 | cFYI(1, ("Full path: %s", full_path)); |
1da177e4 LT |
182 | cFYI(1, ("symname is %s", symname)); |
183 | ||
184 | /* BB what if DFS and this volume is on different share? BB */ | |
c18c842b | 185 | if (pTcon->unix_ext) |
1da177e4 LT |
186 | rc = CIFSUnixCreateSymLink(xid, pTcon, full_path, symname, |
187 | cifs_sb->local_nls); | |
188 | /* else | |
fb8c4b14 SF |
189 | rc = CIFSCreateReparseSymLink(xid, pTcon, fromName, toName, |
190 | cifs_sb_target->local_nls); */ | |
1da177e4 LT |
191 | |
192 | if (rc == 0) { | |
c18c842b | 193 | if (pTcon->unix_ext) |
1da177e4 | 194 | rc = cifs_get_inode_info_unix(&newinode, full_path, |
fb8c4b14 | 195 | inode->i_sb, xid); |
1da177e4 LT |
196 | else |
197 | rc = cifs_get_inode_info(&newinode, full_path, NULL, | |
8b1327f6 | 198 | inode->i_sb, xid, NULL); |
1da177e4 LT |
199 | |
200 | if (rc != 0) { | |
26a21b98 | 201 | cFYI(1, ("Create symlink ok, getinodeinfo fail rc = %d", |
1da177e4 LT |
202 | rc)); |
203 | } else { | |
b92327fe SF |
204 | if (pTcon->nocase) |
205 | direntry->d_op = &cifs_ci_dentry_ops; | |
206 | else | |
207 | direntry->d_op = &cifs_dentry_ops; | |
1da177e4 LT |
208 | d_instantiate(direntry, newinode); |
209 | } | |
210 | } | |
211 | ||
f99d49ad | 212 | kfree(full_path); |
1da177e4 LT |
213 | FreeXid(xid); |
214 | return rc; | |
215 | } | |
216 | ||
cc314eef | 217 | void cifs_put_link(struct dentry *direntry, struct nameidata *nd, void *cookie) |
1da177e4 LT |
218 | { |
219 | char *p = nd_get_link(nd); | |
220 | if (!IS_ERR(p)) | |
221 | kfree(p); | |
222 | } |