~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/fs/cifs/xattr.c

Version: ~ [ linux-5.2-rc5 ] ~ [ linux-5.1.12 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.53 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.128 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.182 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.182 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.68 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.39.4 ] ~ [ linux-2.6.38.8 ] ~ [ linux-2.6.37.6 ] ~ [ linux-2.6.36.4 ] ~ [ linux-2.6.35.14 ] ~ [ linux-2.6.34.15 ] ~ [ linux-2.6.33.20 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  *   fs/cifs/xattr.c
  3  *
  4  *   Copyright (c) International Business Machines  Corp., 2003, 2007
  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 <linux/slab.h>
 25 #include <linux/xattr.h>
 26 #include "cifsfs.h"
 27 #include "cifspdu.h"
 28 #include "cifsglob.h"
 29 #include "cifsproto.h"
 30 #include "cifs_debug.h"
 31 #include "cifs_fs_sb.h"
 32 #include "cifs_unicode.h"
 33 
 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 */
 39 
 40 enum { XATTR_USER, XATTR_CIFS_ACL, XATTR_ACL_ACCESS, XATTR_ACL_DEFAULT };
 41 
 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)
 46 {
 47         int rc = -EOPNOTSUPP;
 48         unsigned int xid;
 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;
 53         char *full_path;
 54 
 55         tlink = cifs_sb_tlink(cifs_sb);
 56         if (IS_ERR(tlink))
 57                 return PTR_ERR(tlink);
 58         pTcon = tlink_tcon(tlink);
 59 
 60         xid = get_xid();
 61 
 62         full_path = build_path_from_dentry(dentry);
 63         if (full_path == NULL) {
 64                 rc = -ENOMEM;
 65                 goto out;
 66         }
 67         /* return dos attributes as pseudo xattr */
 68         /* return alt name if available as pseudo attr */
 69 
 70         /* if proc/fs/cifs/streamstoxattr is set then
 71                 search server for EAs or streams to
 72                 returns as xattrs */
 73         if (size > MAX_EA_VALUE_SIZE) {
 74                 cifs_dbg(FYI, "size of EA value too large\n");
 75                 rc = -EOPNOTSUPP;
 76                 goto out;
 77         }
 78 
 79         switch (handler->flags) {
 80         case XATTR_USER:
 81                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
 82                         goto out;
 83 
 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));
 88                 break;
 89 
 90         case XATTR_CIFS_ACL: {
 91 #ifdef CONFIG_CIFS_ACL
 92                 struct cifs_ntsd *pacl;
 93 
 94                 if (!value)
 95                         goto out;
 96                 pacl = kmalloc(size, GFP_KERNEL);
 97                 if (!pacl) {
 98                         rc = -ENOMEM;
 99                 } else {
100                         memcpy(pacl, value, size);
101                         if (value &&
102                             pTcon->ses->server->ops->set_acl)
103                                 rc = pTcon->ses->server->ops->set_acl(pacl,
104                                                 size, inode,
105                                                 full_path, CIFS_ACL_DACL);
106                         else
107                                 rc = -EOPNOTSUPP;
108                         if (rc == 0) /* force revalidate of the inode */
109                                 CIFS_I(inode)->time = 0;
110                         kfree(pacl);
111                 }
112 #endif /* CONFIG_CIFS_ACL */
113                 break;
114         }
115 
116         case XATTR_ACL_ACCESS:
117 #ifdef CONFIG_CIFS_POSIX
118                 if (!value)
119                         goto out;
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 */
126                 break;
127 
128         case XATTR_ACL_DEFAULT:
129 #ifdef CONFIG_CIFS_POSIX
130                 if (!value)
131                         goto out;
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 */
138                 break;
139         }
140 
141 out:
142         kfree(full_path);
143         free_xid(xid);
144         cifs_put_tlink(tlink);
145         return rc;
146 }
147 
148 static int cifs_attrib_get(struct dentry *dentry,
149                            struct inode *inode, void *value,
150                            size_t size)
151 {
152         ssize_t rc;
153         __u32 *pattribute;
154 
155         rc = cifs_revalidate_dentry_attr(dentry);
156 
157         if (rc)
158                 return rc;
159 
160         if ((value == NULL) || (size == 0))
161                 return sizeof(__u32);
162         else if (size < sizeof(__u32))
163                 return -ERANGE;
164 
165         /* return dos attributes as pseudo xattr */
166         pattribute = (__u32 *)value;
167         *pattribute = CIFS_I(inode)->cifsAttrs;
168 
169         return sizeof(__u32);
170 }
171 
172 static int cifs_creation_time_get(struct dentry *dentry, struct inode *inode,
173                                   void *value, size_t size)
174 {
175         ssize_t rc;
176         __u64 * pcreatetime;
177 
178         rc = cifs_revalidate_dentry_attr(dentry);
179         if (rc)
180                 return rc;
181 
182         if ((value == NULL) || (size == 0))
183                 return sizeof(__u64);
184         else if (size < sizeof(__u64))
185                 return -ERANGE;
186 
187         /* return dos attributes as pseudo xattr */
188         pcreatetime = (__u64 *)value;
189         *pcreatetime = CIFS_I(inode)->createtime;
190         return sizeof(__u64);
191 
192         return rc;
193 }
194 
195 
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)
199 {
200         ssize_t rc = -EOPNOTSUPP;
201         unsigned int xid;
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;
206         char *full_path;
207 
208         tlink = cifs_sb_tlink(cifs_sb);
209         if (IS_ERR(tlink))
210                 return PTR_ERR(tlink);
211         pTcon = tlink_tcon(tlink);
212 
213         xid = get_xid();
214 
215         full_path = build_path_from_dentry(dentry);
216         if (full_path == NULL) {
217                 rc = -ENOMEM;
218                 goto out;
219         }
220 
221         /* return alt name if available as pseudo attr */
222         switch (handler->flags) {
223         case XATTR_USER:
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);
227                         break;
228                 } else if (strcmp(name, CIFS_XATTR_CREATETIME) == 0) {
229                         rc = cifs_creation_time_get(dentry, inode, value, size);
230                         break;
231                 }
232 
233                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
234                         goto out;
235 
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,
239                                 cifs_sb->local_nls, cifs_remap(cifs_sb));
240                 break;
241 
242         case XATTR_CIFS_ACL: {
243 #ifdef CONFIG_CIFS_ACL
244                 u32 acllen;
245                 struct cifs_ntsd *pacl;
246 
247                 if (pTcon->ses->server->ops->get_acl == NULL)
248                         goto out; /* rc already EOPNOTSUPP */
249 
250                 pacl = pTcon->ses->server->ops->get_acl(cifs_sb,
251                                 inode, full_path, &acllen);
252                 if (IS_ERR(pacl)) {
253                         rc = PTR_ERR(pacl);
254                         cifs_dbg(VFS, "%s: error %zd getting sec desc\n",
255                                  __func__, rc);
256                 } else {
257                         if (value) {
258                                 if (acllen > size)
259                                         acllen = -ERANGE;
260                                 else
261                                         memcpy(value, pacl, acllen);
262                         }
263                         rc = acllen;
264                         kfree(pacl);
265                 }
266 #endif  /* CONFIG_CIFS_ACL */
267                 break;
268         }
269 
270         case XATTR_ACL_ACCESS:
271 #ifdef CONFIG_CIFS_POSIX
272                 if (sb->s_flags & MS_POSIXACL)
273                         rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
274                                 value, size, ACL_TYPE_ACCESS,
275                                 cifs_sb->local_nls,
276                                 cifs_remap(cifs_sb));
277 #endif  /* CONFIG_CIFS_POSIX */
278                 break;
279 
280         case XATTR_ACL_DEFAULT:
281 #ifdef CONFIG_CIFS_POSIX
282                 if (sb->s_flags & MS_POSIXACL)
283                         rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
284                                 value, size, ACL_TYPE_DEFAULT,
285                                 cifs_sb->local_nls,
286                                 cifs_remap(cifs_sb));
287 #endif  /* CONFIG_CIFS_POSIX */
288                 break;
289         }
290 
291         /* We could add an additional check for streams ie
292             if proc/fs/cifs/streamstoxattr is set then
293                 search server for EAs or streams to
294                 returns as xattrs */
295 
296         if (rc == -EINVAL)
297                 rc = -EOPNOTSUPP;
298 
299 out:
300         kfree(full_path);
301         free_xid(xid);
302         cifs_put_tlink(tlink);
303         return rc;
304 }
305 
306 ssize_t cifs_listxattr(struct dentry *direntry, char *data, size_t buf_size)
307 {
308         ssize_t rc = -EOPNOTSUPP;
309         unsigned int xid;
310         struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
311         struct tcon_link *tlink;
312         struct cifs_tcon *pTcon;
313         char *full_path;
314 
315         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
316                 return -EOPNOTSUPP;
317 
318         tlink = cifs_sb_tlink(cifs_sb);
319         if (IS_ERR(tlink))
320                 return PTR_ERR(tlink);
321         pTcon = tlink_tcon(tlink);
322 
323         xid = get_xid();
324 
325         full_path = build_path_from_dentry(direntry);
326         if (full_path == NULL) {
327                 rc = -ENOMEM;
328                 goto list_ea_exit;
329         }
330         /* return dos attributes as pseudo xattr */
331         /* return alt name if available as pseudo attr */
332 
333         /* if proc/fs/cifs/streamstoxattr is set then
334                 search server for EAs or streams to
335                 returns as xattrs */
336 
337         if (pTcon->ses->server->ops->query_all_EAs)
338                 rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon,
339                                 full_path, NULL, data, buf_size,
340                                 cifs_sb->local_nls, cifs_remap(cifs_sb));
341 list_ea_exit:
342         kfree(full_path);
343         free_xid(xid);
344         cifs_put_tlink(tlink);
345         return rc;
346 }
347 
348 static const struct xattr_handler cifs_user_xattr_handler = {
349         .prefix = XATTR_USER_PREFIX,
350         .flags = XATTR_USER,
351         .get = cifs_xattr_get,
352         .set = cifs_xattr_set,
353 };
354 
355 /* os2.* attributes are treated like user.* attributes */
356 static const struct xattr_handler cifs_os2_xattr_handler = {
357         .prefix = XATTR_OS2_PREFIX,
358         .flags = XATTR_USER,
359         .get = cifs_xattr_get,
360         .set = cifs_xattr_set,
361 };
362 
363 static const struct xattr_handler cifs_cifs_acl_xattr_handler = {
364         .name = CIFS_XATTR_CIFS_ACL,
365         .flags = XATTR_CIFS_ACL,
366         .get = cifs_xattr_get,
367         .set = cifs_xattr_set,
368 };
369 
370 static const struct xattr_handler cifs_posix_acl_access_xattr_handler = {
371         .name = XATTR_NAME_POSIX_ACL_ACCESS,
372         .flags = XATTR_ACL_ACCESS,
373         .get = cifs_xattr_get,
374         .set = cifs_xattr_set,
375 };
376 
377 static const struct xattr_handler cifs_posix_acl_default_xattr_handler = {
378         .name = XATTR_NAME_POSIX_ACL_DEFAULT,
379         .flags = XATTR_ACL_DEFAULT,
380         .get = cifs_xattr_get,
381         .set = cifs_xattr_set,
382 };
383 
384 const struct xattr_handler *cifs_xattr_handlers[] = {
385         &cifs_user_xattr_handler,
386         &cifs_os2_xattr_handler,
387         &cifs_cifs_acl_xattr_handler,
388         &cifs_posix_acl_access_xattr_handler,
389         &cifs_posix_acl_default_xattr_handler,
390         NULL
391 };
392 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp