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"
32 #define MAX_EA_VALUE_SIZE 65535
33 #define CIFS_XATTR_DOS_ATTRIB "user.DosAttrib"
34 #define CIFS_XATTR_CIFS_ACL "system.cifs_acl"
36 /* BB need to add server (Samba e.g) support for security and trusted prefix */
38 int cifs_removexattr(struct dentry *direntry, const char *ea_name)
41 #ifdef CONFIG_CIFS_XATTR
43 struct cifs_sb_info *cifs_sb;
44 struct tcon_link *tlink;
45 struct cifs_tcon *pTcon;
46 struct super_block *sb;
47 char *full_path = NULL;
51 if (direntry->d_inode == NULL)
53 sb = direntry->d_inode->i_sb;
57 cifs_sb = CIFS_SB(sb);
58 tlink = cifs_sb_tlink(cifs_sb);
60 return PTR_ERR(tlink);
61 pTcon = tlink_tcon(tlink);
65 full_path = build_path_from_dentry(direntry);
66 if (full_path == NULL) {
70 if (ea_name == NULL) {
71 cifs_dbg(FYI, "Null xattr names not supported\n");
72 } else if (strncmp(ea_name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN)
73 && (strncmp(ea_name, XATTR_OS2_PREFIX, XATTR_OS2_PREFIX_LEN))) {
75 "illegal xattr request %s (only user namespace supported)\n",
77 /* BB what if no namespace prefix? */
78 /* Should we just pass them to server, except for
79 system and perhaps security prefixes? */
81 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
84 ea_name += XATTR_USER_PREFIX_LEN; /* skip past user. prefix */
85 if (pTcon->ses->server->ops->set_EA)
86 rc = pTcon->ses->server->ops->set_EA(xid, pTcon,
87 full_path, ea_name, NULL, (__u16)0,
88 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
89 CIFS_MOUNT_MAP_SPECIAL_CHR);
94 cifs_put_tlink(tlink);
99 int cifs_setxattr(struct dentry *direntry, const char *ea_name,
100 const void *ea_value, size_t value_size, int flags)
102 int rc = -EOPNOTSUPP;
103 #ifdef CONFIG_CIFS_XATTR
105 struct cifs_sb_info *cifs_sb;
106 struct tcon_link *tlink;
107 struct cifs_tcon *pTcon;
108 struct super_block *sb;
111 if (direntry == NULL)
113 if (direntry->d_inode == NULL)
115 sb = direntry->d_inode->i_sb;
119 cifs_sb = CIFS_SB(sb);
120 tlink = cifs_sb_tlink(cifs_sb);
122 return PTR_ERR(tlink);
123 pTcon = tlink_tcon(tlink);
127 full_path = build_path_from_dentry(direntry);
128 if (full_path == NULL) {
132 /* return dos attributes as pseudo xattr */
133 /* return alt name if available as pseudo attr */
135 /* if proc/fs/cifs/streamstoxattr is set then
136 search server for EAs or streams to
138 if (value_size > MAX_EA_VALUE_SIZE) {
139 cifs_dbg(FYI, "size of EA value too large\n");
144 if (ea_name == NULL) {
145 cifs_dbg(FYI, "Null xattr names not supported\n");
146 } else if (strncmp(ea_name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN)
148 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
150 if (strncmp(ea_name, CIFS_XATTR_DOS_ATTRIB, 14) == 0)
151 cifs_dbg(FYI, "attempt to set cifs inode metadata\n");
153 ea_name += XATTR_USER_PREFIX_LEN; /* skip past user. prefix */
154 if (pTcon->ses->server->ops->set_EA)
155 rc = pTcon->ses->server->ops->set_EA(xid, pTcon,
156 full_path, ea_name, ea_value, (__u16)value_size,
157 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
158 CIFS_MOUNT_MAP_SPECIAL_CHR);
159 } else if (strncmp(ea_name, XATTR_OS2_PREFIX, XATTR_OS2_PREFIX_LEN)
161 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
164 ea_name += XATTR_OS2_PREFIX_LEN; /* skip past os2. prefix */
165 if (pTcon->ses->server->ops->set_EA)
166 rc = pTcon->ses->server->ops->set_EA(xid, pTcon,
167 full_path, ea_name, ea_value, (__u16)value_size,
168 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
169 CIFS_MOUNT_MAP_SPECIAL_CHR);
170 } else if (strncmp(ea_name, CIFS_XATTR_CIFS_ACL,
171 strlen(CIFS_XATTR_CIFS_ACL)) == 0) {
172 #ifdef CONFIG_CIFS_ACL
173 struct cifs_ntsd *pacl;
174 pacl = kmalloc(value_size, GFP_KERNEL);
178 memcpy(pacl, ea_value, value_size);
179 rc = set_cifs_acl(pacl, value_size,
180 direntry->d_inode, full_path, CIFS_ACL_DACL);
181 if (rc == 0) /* force revalidate of the inode */
182 CIFS_I(direntry->d_inode)->time = 0;
186 cifs_dbg(FYI, "Set CIFS ACL not supported yet\n");
187 #endif /* CONFIG_CIFS_ACL */
190 temp = strncmp(ea_name, POSIX_ACL_XATTR_ACCESS,
191 strlen(POSIX_ACL_XATTR_ACCESS));
193 #ifdef CONFIG_CIFS_POSIX
194 if (sb->s_flags & MS_POSIXACL)
195 rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
196 ea_value, (const int)value_size,
197 ACL_TYPE_ACCESS, cifs_sb->local_nls,
198 cifs_sb->mnt_cifs_flags &
199 CIFS_MOUNT_MAP_SPECIAL_CHR);
200 cifs_dbg(FYI, "set POSIX ACL rc %d\n", rc);
202 cifs_dbg(FYI, "set POSIX ACL not supported\n");
204 } else if (strncmp(ea_name, POSIX_ACL_XATTR_DEFAULT,
205 strlen(POSIX_ACL_XATTR_DEFAULT)) == 0) {
206 #ifdef CONFIG_CIFS_POSIX
207 if (sb->s_flags & MS_POSIXACL)
208 rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
209 ea_value, (const int)value_size,
210 ACL_TYPE_DEFAULT, cifs_sb->local_nls,
211 cifs_sb->mnt_cifs_flags &
212 CIFS_MOUNT_MAP_SPECIAL_CHR);
213 cifs_dbg(FYI, "set POSIX default ACL rc %d\n", rc);
215 cifs_dbg(FYI, "set default POSIX ACL not supported\n");
218 cifs_dbg(FYI, "illegal xattr request %s (only user namespace supported)\n",
220 /* BB what if no namespace prefix? */
221 /* Should we just pass them to server, except for
222 system and perhaps security prefixes? */
229 cifs_put_tlink(tlink);
234 ssize_t cifs_getxattr(struct dentry *direntry, const char *ea_name,
235 void *ea_value, size_t buf_size)
237 ssize_t rc = -EOPNOTSUPP;
238 #ifdef CONFIG_CIFS_XATTR
240 struct cifs_sb_info *cifs_sb;
241 struct tcon_link *tlink;
242 struct cifs_tcon *pTcon;
243 struct super_block *sb;
246 if (direntry == NULL)
248 if (direntry->d_inode == NULL)
250 sb = direntry->d_inode->i_sb;
254 cifs_sb = CIFS_SB(sb);
255 tlink = cifs_sb_tlink(cifs_sb);
257 return PTR_ERR(tlink);
258 pTcon = tlink_tcon(tlink);
262 full_path = build_path_from_dentry(direntry);
263 if (full_path == NULL) {
267 /* return dos attributes as pseudo xattr */
268 /* return alt name if available as pseudo attr */
269 if (ea_name == NULL) {
270 cifs_dbg(FYI, "Null xattr names not supported\n");
271 } else if (strncmp(ea_name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN)
273 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
276 if (strncmp(ea_name, CIFS_XATTR_DOS_ATTRIB, 14) == 0) {
277 cifs_dbg(FYI, "attempt to query cifs inode metadata\n");
278 /* revalidate/getattr then populate from inode */
279 } /* BB add else when above is implemented */
280 ea_name += XATTR_USER_PREFIX_LEN; /* skip past user. prefix */
281 if (pTcon->ses->server->ops->query_all_EAs)
282 rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon,
283 full_path, ea_name, ea_value, buf_size,
284 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
285 CIFS_MOUNT_MAP_SPECIAL_CHR);
286 } else if (strncmp(ea_name, XATTR_OS2_PREFIX, XATTR_OS2_PREFIX_LEN) == 0) {
287 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
290 ea_name += XATTR_OS2_PREFIX_LEN; /* skip past os2. prefix */
291 if (pTcon->ses->server->ops->query_all_EAs)
292 rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon,
293 full_path, ea_name, ea_value, buf_size,
294 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
295 CIFS_MOUNT_MAP_SPECIAL_CHR);
296 } else if (strncmp(ea_name, POSIX_ACL_XATTR_ACCESS,
297 strlen(POSIX_ACL_XATTR_ACCESS)) == 0) {
298 #ifdef CONFIG_CIFS_POSIX
299 if (sb->s_flags & MS_POSIXACL)
300 rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
301 ea_value, buf_size, ACL_TYPE_ACCESS,
303 cifs_sb->mnt_cifs_flags &
304 CIFS_MOUNT_MAP_SPECIAL_CHR);
306 cifs_dbg(FYI, "Query POSIX ACL not supported yet\n");
307 #endif /* CONFIG_CIFS_POSIX */
308 } else if (strncmp(ea_name, POSIX_ACL_XATTR_DEFAULT,
309 strlen(POSIX_ACL_XATTR_DEFAULT)) == 0) {
310 #ifdef CONFIG_CIFS_POSIX
311 if (sb->s_flags & MS_POSIXACL)
312 rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
313 ea_value, buf_size, ACL_TYPE_DEFAULT,
315 cifs_sb->mnt_cifs_flags &
316 CIFS_MOUNT_MAP_SPECIAL_CHR);
318 cifs_dbg(FYI, "Query POSIX default ACL not supported yet\n");
319 #endif /* CONFIG_CIFS_POSIX */
320 } else if (strncmp(ea_name, CIFS_XATTR_CIFS_ACL,
321 strlen(CIFS_XATTR_CIFS_ACL)) == 0) {
322 #ifdef CONFIG_CIFS_ACL
324 struct cifs_ntsd *pacl;
326 pacl = get_cifs_acl(cifs_sb, direntry->d_inode,
330 cifs_dbg(VFS, "%s: error %zd getting sec desc\n",
334 if (acllen > buf_size)
337 memcpy(ea_value, pacl, acllen);
343 cifs_dbg(FYI, "Query CIFS ACL not supported yet\n");
344 #endif /* CONFIG_CIFS_ACL */
345 } else if (strncmp(ea_name,
346 XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN) == 0) {
347 cifs_dbg(FYI, "Trusted xattr namespace not supported yet\n");
348 } else if (strncmp(ea_name,
349 XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN) == 0) {
350 cifs_dbg(FYI, "Security xattr namespace not supported yet\n");
353 "illegal xattr request %s (only user namespace supported)\n",
356 /* We could add an additional check for streams ie
357 if proc/fs/cifs/streamstoxattr is set then
358 search server for EAs or streams to
367 cifs_put_tlink(tlink);
372 ssize_t cifs_listxattr(struct dentry *direntry, char *data, size_t buf_size)
374 ssize_t rc = -EOPNOTSUPP;
375 #ifdef CONFIG_CIFS_XATTR
377 struct cifs_sb_info *cifs_sb;
378 struct tcon_link *tlink;
379 struct cifs_tcon *pTcon;
380 struct super_block *sb;
383 if (direntry == NULL)
385 if (direntry->d_inode == NULL)
387 sb = direntry->d_inode->i_sb;
391 cifs_sb = CIFS_SB(sb);
392 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
395 tlink = cifs_sb_tlink(cifs_sb);
397 return PTR_ERR(tlink);
398 pTcon = tlink_tcon(tlink);
402 full_path = build_path_from_dentry(direntry);
403 if (full_path == NULL) {
407 /* return dos attributes as pseudo xattr */
408 /* return alt name if available as pseudo attr */
410 /* if proc/fs/cifs/streamstoxattr is set then
411 search server for EAs or streams to
414 if (pTcon->ses->server->ops->query_all_EAs)
415 rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon,
416 full_path, NULL, data, buf_size,
417 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
418 CIFS_MOUNT_MAP_SPECIAL_CHR);
422 cifs_put_tlink(tlink);