4 * Copyright (c) International Business Machines Corp., 2003, 2007
5 * Author(s): Steve French (sfrench@us.ibm.com)
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.
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.
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
23 #include <linux/posix_acl_xattr.h>
24 #include <linux/slab.h>
25 #include <linux/xattr.h>
29 #include "cifsproto.h"
30 #include "cifs_debug.h"
31 #include "cifs_fs_sb.h"
32 #include "cifs_unicode.h"
34 #define MAX_EA_VALUE_SIZE 65535
35 #define CIFS_XATTR_CIFS_ACL "system.cifs_acl"
36 #define CIFS_XATTR_ATTRIB "cifs.dosattrib" /* full name: user.cifs.dosattrib */
37 #define CIFS_XATTR_CREATETIME "cifs.creationtime" /* user.cifs.creationtime */
38 /* BB need to add server (Samba e.g) support for security and trusted prefix */
40 enum { XATTR_USER, XATTR_CIFS_ACL, XATTR_ACL_ACCESS, XATTR_ACL_DEFAULT };
42 static int cifs_xattr_set(const struct xattr_handler *handler,
43 struct dentry *dentry, struct inode *inode,
44 const char *name, const void *value,
45 size_t size, int flags)
49 struct super_block *sb = dentry->d_sb;
50 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
51 struct tcon_link *tlink;
52 struct cifs_tcon *pTcon;
55 tlink = cifs_sb_tlink(cifs_sb);
57 return PTR_ERR(tlink);
58 pTcon = tlink_tcon(tlink);
62 full_path = build_path_from_dentry(dentry);
63 if (full_path == NULL) {
67 /* return dos attributes as pseudo xattr */
68 /* return alt name if available as pseudo attr */
70 /* if proc/fs/cifs/streamstoxattr is set then
71 search server for EAs or streams to
73 if (size > MAX_EA_VALUE_SIZE) {
74 cifs_dbg(FYI, "size of EA value too large\n");
79 switch (handler->flags) {
81 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
84 if (pTcon->ses->server->ops->set_EA)
85 rc = pTcon->ses->server->ops->set_EA(xid, pTcon,
86 full_path, name, value, (__u16)size,
87 cifs_sb->local_nls, cifs_remap(cifs_sb));
90 case XATTR_CIFS_ACL: {
91 #ifdef CONFIG_CIFS_ACL
92 struct cifs_ntsd *pacl;
96 pacl = kmalloc(size, GFP_KERNEL);
100 memcpy(pacl, value, size);
102 pTcon->ses->server->ops->set_acl)
103 rc = pTcon->ses->server->ops->set_acl(pacl,
105 full_path, CIFS_ACL_DACL);
108 if (rc == 0) /* force revalidate of the inode */
109 CIFS_I(inode)->time = 0;
112 #endif /* CONFIG_CIFS_ACL */
116 case XATTR_ACL_ACCESS:
117 #ifdef CONFIG_CIFS_POSIX
120 if (sb->s_flags & MS_POSIXACL)
121 rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
122 value, (const int)size,
123 ACL_TYPE_ACCESS, cifs_sb->local_nls,
124 cifs_remap(cifs_sb));
125 #endif /* CONFIG_CIFS_POSIX */
128 case XATTR_ACL_DEFAULT:
129 #ifdef CONFIG_CIFS_POSIX
132 if (sb->s_flags & MS_POSIXACL)
133 rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
134 value, (const int)size,
135 ACL_TYPE_DEFAULT, cifs_sb->local_nls,
136 cifs_remap(cifs_sb));
137 #endif /* CONFIG_CIFS_POSIX */
144 cifs_put_tlink(tlink);
148 static int cifs_attrib_get(struct dentry *dentry,
149 struct inode *inode, void *value,
155 rc = cifs_revalidate_dentry_attr(dentry);
160 if ((value == NULL) || (size == 0))
161 return sizeof(__u32);
162 else if (size < sizeof(__u32))
165 /* return dos attributes as pseudo xattr */
166 pattribute = (__u32 *)value;
167 *pattribute = CIFS_I(inode)->cifsAttrs;
169 return sizeof(__u32);
172 static int cifs_creation_time_get(struct dentry *dentry, struct inode *inode,
173 void *value, size_t size)
178 rc = cifs_revalidate_dentry_attr(dentry);
182 if ((value == NULL) || (size == 0))
183 return sizeof(__u64);
184 else if (size < sizeof(__u64))
187 /* return dos attributes as pseudo xattr */
188 pcreatetime = (__u64 *)value;
189 *pcreatetime = CIFS_I(inode)->createtime;
190 return sizeof(__u64);
196 static int cifs_xattr_get(const struct xattr_handler *handler,
197 struct dentry *dentry, struct inode *inode,
198 const char *name, void *value, size_t size)
200 ssize_t rc = -EOPNOTSUPP;
202 struct super_block *sb = dentry->d_sb;
203 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
204 struct tcon_link *tlink;
205 struct cifs_tcon *pTcon;
208 tlink = cifs_sb_tlink(cifs_sb);
210 return PTR_ERR(tlink);
211 pTcon = tlink_tcon(tlink);
215 full_path = build_path_from_dentry(dentry);
216 if (full_path == NULL) {
221 /* return alt name if available as pseudo attr */
222 switch (handler->flags) {
224 cifs_dbg(FYI, "%s:querying user xattr %s\n", __func__, name);
225 if (strcmp(name, CIFS_XATTR_ATTRIB) == 0) {
226 rc = cifs_attrib_get(dentry, inode, value, size);
228 } else if (strcmp(name, CIFS_XATTR_CREATETIME) == 0) {
229 rc = cifs_creation_time_get(dentry, inode, value, size);
233 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
236 if (pTcon->ses->server->ops->query_all_EAs)
237 rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon,
238 full_path, name, value, size, cifs_sb);
241 case XATTR_CIFS_ACL: {
242 #ifdef CONFIG_CIFS_ACL
244 struct cifs_ntsd *pacl;
246 if (pTcon->ses->server->ops->get_acl == NULL)
247 goto out; /* rc already EOPNOTSUPP */
249 pacl = pTcon->ses->server->ops->get_acl(cifs_sb,
250 inode, full_path, &acllen);
253 cifs_dbg(VFS, "%s: error %zd getting sec desc\n",
260 memcpy(value, pacl, acllen);
265 #endif /* CONFIG_CIFS_ACL */
269 case XATTR_ACL_ACCESS:
270 #ifdef CONFIG_CIFS_POSIX
271 if (sb->s_flags & MS_POSIXACL)
272 rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
273 value, size, ACL_TYPE_ACCESS,
275 cifs_remap(cifs_sb));
276 #endif /* CONFIG_CIFS_POSIX */
279 case XATTR_ACL_DEFAULT:
280 #ifdef CONFIG_CIFS_POSIX
281 if (sb->s_flags & MS_POSIXACL)
282 rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
283 value, size, ACL_TYPE_DEFAULT,
285 cifs_remap(cifs_sb));
286 #endif /* CONFIG_CIFS_POSIX */
290 /* We could add an additional check for streams ie
291 if proc/fs/cifs/streamstoxattr is set then
292 search server for EAs or streams to
301 cifs_put_tlink(tlink);
305 ssize_t cifs_listxattr(struct dentry *direntry, char *data, size_t buf_size)
307 ssize_t rc = -EOPNOTSUPP;
309 struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
310 struct tcon_link *tlink;
311 struct cifs_tcon *pTcon;
314 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
317 tlink = cifs_sb_tlink(cifs_sb);
319 return PTR_ERR(tlink);
320 pTcon = tlink_tcon(tlink);
324 full_path = build_path_from_dentry(direntry);
325 if (full_path == NULL) {
329 /* return dos attributes as pseudo xattr */
330 /* return alt name if available as pseudo attr */
332 /* if proc/fs/cifs/streamstoxattr is set then
333 search server for EAs or streams to
336 if (pTcon->ses->server->ops->query_all_EAs)
337 rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon,
338 full_path, NULL, data, buf_size, cifs_sb);
342 cifs_put_tlink(tlink);
346 static const struct xattr_handler cifs_user_xattr_handler = {
347 .prefix = XATTR_USER_PREFIX,
349 .get = cifs_xattr_get,
350 .set = cifs_xattr_set,
353 /* os2.* attributes are treated like user.* attributes */
354 static const struct xattr_handler cifs_os2_xattr_handler = {
355 .prefix = XATTR_OS2_PREFIX,
357 .get = cifs_xattr_get,
358 .set = cifs_xattr_set,
361 static const struct xattr_handler cifs_cifs_acl_xattr_handler = {
362 .name = CIFS_XATTR_CIFS_ACL,
363 .flags = XATTR_CIFS_ACL,
364 .get = cifs_xattr_get,
365 .set = cifs_xattr_set,
368 static const struct xattr_handler cifs_posix_acl_access_xattr_handler = {
369 .name = XATTR_NAME_POSIX_ACL_ACCESS,
370 .flags = XATTR_ACL_ACCESS,
371 .get = cifs_xattr_get,
372 .set = cifs_xattr_set,
375 static const struct xattr_handler cifs_posix_acl_default_xattr_handler = {
376 .name = XATTR_NAME_POSIX_ACL_DEFAULT,
377 .flags = XATTR_ACL_DEFAULT,
378 .get = cifs_xattr_get,
379 .set = cifs_xattr_set,
382 const struct xattr_handler *cifs_xattr_handlers[] = {
383 &cifs_user_xattr_handler,
384 &cifs_os2_xattr_handler,
385 &cifs_cifs_acl_xattr_handler,
386 &cifs_posix_acl_access_xattr_handler,
387 &cifs_posix_acl_default_xattr_handler,