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-rw-r--r--fs/cifs/xattr.c334
1 files changed, 334 insertions, 0 deletions
diff --git a/fs/cifs/xattr.c b/fs/cifs/xattr.c
new file mode 100644
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--- /dev/null
+++ b/fs/cifs/xattr.c
@@ -0,0 +1,334 @@
1/*
2 * fs/cifs/xattr.c
3 *
4 * Copyright (c) International Business Machines Corp., 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
22#include <linux/fs.h>
23#include <linux/posix_acl_xattr.h>
24#include "cifsfs.h"
25#include "cifspdu.h"
26#include "cifsglob.h"
27#include "cifsproto.h"
28#include "cifs_debug.h"
29
30#define MAX_EA_VALUE_SIZE 65535
31#define CIFS_XATTR_DOS_ATTRIB "user.DosAttrib"
32#define CIFS_XATTR_USER_PREFIX "user."
33#define CIFS_XATTR_SYSTEM_PREFIX "system."
34#define CIFS_XATTR_OS2_PREFIX "os2."
35#define CIFS_XATTR_SECURITY_PREFIX ".security"
36#define CIFS_XATTR_TRUSTED_PREFIX "trusted."
37#define XATTR_TRUSTED_PREFIX_LEN 8
38#define XATTR_SECURITY_PREFIX_LEN 9
39/* BB need to add server (Samba e.g) support for security and trusted prefix */
40
41
42
43int cifs_removexattr(struct dentry * direntry, const char * ea_name)
44{
45 int rc = -EOPNOTSUPP;
46#ifdef CONFIG_CIFS_XATTR
47 int xid;
48 struct cifs_sb_info *cifs_sb;
49 struct cifsTconInfo *pTcon;
50 struct super_block * sb;
51 char * full_path;
52
53 if(direntry == NULL)
54 return -EIO;
55 if(direntry->d_inode == NULL)
56 return -EIO;
57 sb = direntry->d_inode->i_sb;
58 if(sb == NULL)
59 return -EIO;
60 xid = GetXid();
61
62 cifs_sb = CIFS_SB(sb);
63 pTcon = cifs_sb->tcon;
64
65 down(&sb->s_vfs_rename_sem);
66 full_path = build_path_from_dentry(direntry);
67 up(&sb->s_vfs_rename_sem);
68 if(full_path == NULL) {
69 FreeXid(xid);
70 return -ENOMEM;
71 }
72 if(ea_name == NULL) {
73 cFYI(1,("Null xattr names not supported"));
74 } else if(strncmp(ea_name,CIFS_XATTR_USER_PREFIX,5)
75 && (strncmp(ea_name,CIFS_XATTR_OS2_PREFIX,4))) {
76 cFYI(1,("illegal xattr namespace %s (only user namespace supported)",ea_name));
77 /* BB what if no namespace prefix? */
78 /* Should we just pass them to server, except for
79 system and perhaps security prefixes? */
80 } else {
81 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
82 goto remove_ea_exit;
83
84 ea_name+=5; /* skip past user. prefix */
85 rc = CIFSSMBSetEA(xid,pTcon,full_path,ea_name,NULL,
86 (__u16)0, cifs_sb->local_nls);
87 }
88remove_ea_exit:
89 if (full_path)
90 kfree(full_path);
91 FreeXid(xid);
92#endif
93 return rc;
94}
95
96int cifs_setxattr(struct dentry * direntry, const char * ea_name,
97 const void * ea_value, size_t value_size, int flags)
98{
99 int rc = -EOPNOTSUPP;
100#ifdef CONFIG_CIFS_XATTR
101 int xid;
102 struct cifs_sb_info *cifs_sb;
103 struct cifsTconInfo *pTcon;
104 struct super_block * sb;
105 char * full_path;
106
107 if(direntry == NULL)
108 return -EIO;
109 if(direntry->d_inode == NULL)
110 return -EIO;
111 sb = direntry->d_inode->i_sb;
112 if(sb == NULL)
113 return -EIO;
114 xid = GetXid();
115
116 cifs_sb = CIFS_SB(sb);
117 pTcon = cifs_sb->tcon;
118
119 down(&sb->s_vfs_rename_sem);
120 full_path = build_path_from_dentry(direntry);
121 up(&sb->s_vfs_rename_sem);
122 if(full_path == NULL) {
123 FreeXid(xid);
124 return -ENOMEM;
125 }
126 /* return dos attributes as pseudo xattr */
127 /* return alt name if available as pseudo attr */
128
129 /* if proc/fs/cifs/streamstoxattr is set then
130 search server for EAs or streams to
131 returns as xattrs */
132 if(value_size > MAX_EA_VALUE_SIZE) {
133 cFYI(1,("size of EA value too large"));
134 if(full_path)
135 kfree(full_path);
136 FreeXid(xid);
137 return -EOPNOTSUPP;
138 }
139
140 if(ea_name == NULL) {
141 cFYI(1,("Null xattr names not supported"));
142 } else if(strncmp(ea_name,CIFS_XATTR_USER_PREFIX,5) == 0) {
143 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
144 goto set_ea_exit;
145 if(strncmp(ea_name,CIFS_XATTR_DOS_ATTRIB,14) == 0) {
146 cFYI(1,("attempt to set cifs inode metadata"));
147 }
148 ea_name += 5; /* skip past user. prefix */
149 rc = CIFSSMBSetEA(xid,pTcon,full_path,ea_name,ea_value,
150 (__u16)value_size, cifs_sb->local_nls);
151 } else if(strncmp(ea_name, CIFS_XATTR_OS2_PREFIX,4) == 0) {
152 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
153 goto set_ea_exit;
154
155 ea_name += 4; /* skip past os2. prefix */
156 rc = CIFSSMBSetEA(xid,pTcon,full_path,ea_name,ea_value,
157 (__u16)value_size, cifs_sb->local_nls);
158 } else {
159 int temp;
160 temp = strncmp(ea_name,POSIX_ACL_XATTR_ACCESS,
161 strlen(POSIX_ACL_XATTR_ACCESS));
162 if (temp == 0) {
163#ifdef CONFIG_CIFS_POSIX
164 rc = CIFSSMBSetPosixACL(xid, pTcon,full_path,ea_value,
165 (const int)value_size, ACL_TYPE_ACCESS,
166 cifs_sb->local_nls);
167 cFYI(1,("set POSIX ACL rc %d",rc));
168#else
169 cFYI(1,("set POSIX ACL not supported"));
170#endif
171 } else if(strncmp(ea_name,POSIX_ACL_XATTR_DEFAULT,strlen(POSIX_ACL_XATTR_DEFAULT)) == 0) {
172#ifdef CONFIG_CIFS_POSIX
173 rc = CIFSSMBSetPosixACL(xid, pTcon,full_path,ea_value,
174 (const int)value_size, ACL_TYPE_DEFAULT,
175 cifs_sb->local_nls);
176 cFYI(1,("set POSIX default ACL rc %d",rc));
177#else
178 cFYI(1,("set default POSIX ACL not supported"));
179#endif
180 } else {
181 cFYI(1,("illegal xattr request %s (only user namespace supported)",ea_name));
182 /* BB what if no namespace prefix? */
183 /* Should we just pass them to server, except for
184 system and perhaps security prefixes? */
185 }
186 }
187
188set_ea_exit:
189 if (full_path)
190 kfree(full_path);
191 FreeXid(xid);
192#endif
193 return rc;
194}
195
196ssize_t cifs_getxattr(struct dentry * direntry, const char * ea_name,
197 void * ea_value, size_t buf_size)
198{
199 ssize_t rc = -EOPNOTSUPP;
200#ifdef CONFIG_CIFS_XATTR
201 int xid;
202 struct cifs_sb_info *cifs_sb;
203 struct cifsTconInfo *pTcon;
204 struct super_block * sb;
205 char * full_path;
206
207 if(direntry == NULL)
208 return -EIO;
209 if(direntry->d_inode == NULL)
210 return -EIO;
211 sb = direntry->d_inode->i_sb;
212 if(sb == NULL)
213 return -EIO;
214
215 xid = GetXid();
216
217 cifs_sb = CIFS_SB(sb);
218 pTcon = cifs_sb->tcon;
219
220 down(&sb->s_vfs_rename_sem);
221 full_path = build_path_from_dentry(direntry);
222 up(&sb->s_vfs_rename_sem);
223 if(full_path == NULL) {
224 FreeXid(xid);
225 return -ENOMEM;
226 }
227 /* return dos attributes as pseudo xattr */
228 /* return alt name if available as pseudo attr */
229 if(ea_name == NULL) {
230 cFYI(1,("Null xattr names not supported"));
231 } else if(strncmp(ea_name,CIFS_XATTR_USER_PREFIX,5) == 0) {
232 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
233 goto get_ea_exit;
234
235 if(strncmp(ea_name,CIFS_XATTR_DOS_ATTRIB,14) == 0) {
236 cFYI(1,("attempt to query cifs inode metadata"));
237 /* revalidate/getattr then populate from inode */
238 } /* BB add else when above is implemented */
239 ea_name += 5; /* skip past user. prefix */
240 rc = CIFSSMBQueryEA(xid,pTcon,full_path,ea_name,ea_value,
241 buf_size, cifs_sb->local_nls);
242 } else if(strncmp(ea_name, CIFS_XATTR_OS2_PREFIX,4) == 0) {
243 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
244 goto get_ea_exit;
245
246 ea_name += 4; /* skip past os2. prefix */
247 rc = CIFSSMBQueryEA(xid,pTcon,full_path,ea_name,ea_value,
248 buf_size, cifs_sb->local_nls);
249 } else if(strncmp(ea_name,POSIX_ACL_XATTR_ACCESS,strlen(POSIX_ACL_XATTR_ACCESS)) == 0) {
250#ifdef CONFIG_CIFS_POSIX
251 rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
252 ea_value, buf_size, ACL_TYPE_ACCESS,
253 cifs_sb->local_nls);
254#else
255 cFYI(1,("query POSIX ACL not supported yet"));
256#endif /* CONFIG_CIFS_POSIX */
257 } else if(strncmp(ea_name,POSIX_ACL_XATTR_DEFAULT,strlen(POSIX_ACL_XATTR_DEFAULT)) == 0) {
258#ifdef CONFIG_CIFS_POSIX
259 rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
260 ea_value, buf_size, ACL_TYPE_DEFAULT,
261 cifs_sb->local_nls);
262#else
263 cFYI(1,("query POSIX default ACL not supported yet"));
264#endif
265 } else if(strncmp(ea_name,
266 CIFS_XATTR_TRUSTED_PREFIX,XATTR_TRUSTED_PREFIX_LEN) == 0) {
267 cFYI(1,("Trusted xattr namespace not supported yet"));
268 } else if(strncmp(ea_name,
269 CIFS_XATTR_SECURITY_PREFIX,XATTR_SECURITY_PREFIX_LEN) == 0) {
270 cFYI(1,("Security xattr namespace not supported yet"));
271 } else {
272 cFYI(1,("illegal xattr name request %s (only user namespace supported)",ea_name));
273 }
274
275 /* We could add an additional check for streams ie
276 if proc/fs/cifs/streamstoxattr is set then
277 search server for EAs or streams to
278 returns as xattrs */
279
280 if(rc == -EINVAL)
281 rc = -EOPNOTSUPP;
282
283get_ea_exit:
284 if (full_path)
285 kfree(full_path);
286 FreeXid(xid);
287#endif
288 return rc;
289}
290
291ssize_t cifs_listxattr(struct dentry * direntry, char * data, size_t buf_size)
292{
293 ssize_t rc = -EOPNOTSUPP;
294#ifdef CONFIG_CIFS_XATTR
295 int xid;
296 struct cifs_sb_info *cifs_sb;
297 struct cifsTconInfo *pTcon;
298 struct super_block * sb;
299 char * full_path;
300
301 if(direntry == NULL)
302 return -EIO;
303 if(direntry->d_inode == NULL)
304 return -EIO;
305 sb = direntry->d_inode->i_sb;
306 if(sb == NULL)
307 return -EIO;
308 xid = GetXid();
309
310 cifs_sb = CIFS_SB(sb);
311 pTcon = cifs_sb->tcon;
312
313 down(&sb->s_vfs_rename_sem);
314 full_path = build_path_from_dentry(direntry);
315 up(&sb->s_vfs_rename_sem);
316 if(full_path == NULL) {
317 FreeXid(xid);
318 return -ENOMEM;
319 }
320 /* return dos attributes as pseudo xattr */
321 /* return alt name if available as pseudo attr */
322
323 /* if proc/fs/cifs/streamstoxattr is set then
324 search server for EAs or streams to
325 returns as xattrs */
326 rc = CIFSSMBQAllEAs(xid,pTcon,full_path,data,buf_size,
327 cifs_sb->local_nls);
328
329 if (full_path)
330 kfree(full_path);
331 FreeXid(xid);
332#endif
333 return rc;
334}
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