2 * Copyright IBM Corporation, 2010
3 * Author Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of version 2.1 of the GNU Lesser General Public License
7 * as published by the Free Software Foundation.
9 * This program is distributed in the hope that it would be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
15 #include <linux/module.h>
17 #include <net/9p/9p.h>
18 #include <net/9p/client.h>
19 #include <linux/slab.h>
20 #include <linux/sched.h>
21 #include <linux/posix_acl_xattr.h>
27 static struct posix_acl
*__v9fs_get_acl(struct p9_fid
*fid
, char *name
)
31 struct posix_acl
*acl
= NULL
;;
33 size
= v9fs_fid_xattr_get(fid
, name
, NULL
, 0);
35 value
= kzalloc(size
, GFP_NOFS
);
37 return ERR_PTR(-ENOMEM
);
38 size
= v9fs_fid_xattr_get(fid
, name
, value
, size
);
40 acl
= posix_acl_from_xattr(value
, size
);
44 } else if (size
== -ENODATA
|| size
== 0 ||
45 size
== -ENOSYS
|| size
== -EOPNOTSUPP
) {
55 int v9fs_get_acl(struct inode
*inode
, struct p9_fid
*fid
)
58 struct posix_acl
*pacl
, *dacl
;
59 struct v9fs_session_info
*v9ses
;
61 v9ses
= v9fs_inode2v9ses(inode
);
62 if ((v9ses
->flags
& V9FS_ACCESS_MASK
) != V9FS_ACCESS_CLIENT
) {
63 set_cached_acl(inode
, ACL_TYPE_DEFAULT
, NULL
);
64 set_cached_acl(inode
, ACL_TYPE_ACCESS
, NULL
);
67 /* get the default/access acl values and cache them */
68 dacl
= __v9fs_get_acl(fid
, POSIX_ACL_XATTR_DEFAULT
);
69 pacl
= __v9fs_get_acl(fid
, POSIX_ACL_XATTR_ACCESS
);
71 if (!IS_ERR(dacl
) && !IS_ERR(pacl
)) {
72 set_cached_acl(inode
, ACL_TYPE_DEFAULT
, dacl
);
73 set_cached_acl(inode
, ACL_TYPE_ACCESS
, pacl
);
74 posix_acl_release(dacl
);
75 posix_acl_release(pacl
);
82 static struct posix_acl
*v9fs_get_cached_acl(struct inode
*inode
, int type
)
84 struct posix_acl
*acl
;
86 * 9p Always cache the acl value when
87 * instantiating the inode (v9fs_inode_from_fid)
89 acl
= get_cached_acl(inode
, type
);
90 BUG_ON(acl
== ACL_NOT_CACHED
);
94 int v9fs_check_acl(struct inode
*inode
, int mask
)
96 struct posix_acl
*acl
;
97 struct v9fs_session_info
*v9ses
;
99 v9ses
= v9fs_inode2v9ses(inode
);
100 if ((v9ses
->flags
& V9FS_ACCESS_MASK
) != V9FS_ACCESS_CLIENT
) {
102 * On access = client mode get the acl
103 * values from the server
107 acl
= v9fs_get_cached_acl(inode
, ACL_TYPE_ACCESS
);
112 int error
= posix_acl_permission(inode
, acl
, mask
);
113 posix_acl_release(acl
);
119 static int v9fs_set_acl(struct dentry
*dentry
, int type
, struct posix_acl
*acl
)
125 struct inode
*inode
= dentry
->d_inode
;
127 set_cached_acl(inode
, type
, acl
);
128 /* Set a setxattr request to server */
129 size
= posix_acl_xattr_size(acl
->a_count
);
130 buffer
= kmalloc(size
, GFP_KERNEL
);
133 retval
= posix_acl_to_xattr(acl
, buffer
, size
);
137 case ACL_TYPE_ACCESS
:
138 name
= POSIX_ACL_XATTR_ACCESS
;
140 case ACL_TYPE_DEFAULT
:
141 name
= POSIX_ACL_XATTR_DEFAULT
;
146 retval
= v9fs_xattr_set(dentry
, name
, buffer
, size
, 0);
152 int v9fs_acl_chmod(struct dentry
*dentry
)
155 struct posix_acl
*acl
, *clone
;
156 struct inode
*inode
= dentry
->d_inode
;
158 if (S_ISLNK(inode
->i_mode
))
160 acl
= v9fs_get_cached_acl(inode
, ACL_TYPE_ACCESS
);
162 clone
= posix_acl_clone(acl
, GFP_KERNEL
);
163 posix_acl_release(acl
);
166 retval
= posix_acl_chmod_masq(clone
, inode
->i_mode
);
168 retval
= v9fs_set_acl(dentry
, ACL_TYPE_ACCESS
, clone
);
169 posix_acl_release(clone
);
174 int v9fs_set_create_acl(struct dentry
*dentry
,
175 struct posix_acl
*dpacl
, struct posix_acl
*pacl
)
178 v9fs_set_acl(dentry
, ACL_TYPE_DEFAULT
, dpacl
);
180 v9fs_set_acl(dentry
, ACL_TYPE_ACCESS
, pacl
);
181 posix_acl_release(dpacl
);
182 posix_acl_release(pacl
);
186 int v9fs_acl_mode(struct inode
*dir
, mode_t
*modep
,
187 struct posix_acl
**dpacl
, struct posix_acl
**pacl
)
190 mode_t mode
= *modep
;
191 struct posix_acl
*acl
= NULL
;
193 if (!S_ISLNK(mode
)) {
194 acl
= v9fs_get_cached_acl(dir
, ACL_TYPE_DEFAULT
);
198 mode
&= ~current_umask();
201 struct posix_acl
*clone
;
205 clone
= posix_acl_clone(acl
, GFP_NOFS
);
210 retval
= posix_acl_create_masq(clone
, &mode
);
212 posix_acl_release(clone
);
221 posix_acl_release(acl
);
226 static int v9fs_remote_get_acl(struct dentry
*dentry
, const char *name
,
227 void *buffer
, size_t size
, int type
)
232 case ACL_TYPE_ACCESS
:
233 full_name
= POSIX_ACL_XATTR_ACCESS
;
235 case ACL_TYPE_DEFAULT
:
236 full_name
= POSIX_ACL_XATTR_DEFAULT
;
241 return v9fs_xattr_get(dentry
, full_name
, buffer
, size
);
244 static int v9fs_xattr_get_acl(struct dentry
*dentry
, const char *name
,
245 void *buffer
, size_t size
, int type
)
247 struct v9fs_session_info
*v9ses
;
248 struct posix_acl
*acl
;
251 if (strcmp(name
, "") != 0)
254 v9ses
= v9fs_inode2v9ses(dentry
->d_inode
);
256 * We allow set/get/list of acl when access=client is not specified
258 if ((v9ses
->flags
& V9FS_ACCESS_MASK
) != V9FS_ACCESS_CLIENT
)
259 return v9fs_remote_get_acl(dentry
, name
, buffer
, size
, type
);
261 acl
= v9fs_get_cached_acl(dentry
->d_inode
, type
);
266 error
= posix_acl_to_xattr(acl
, buffer
, size
);
267 posix_acl_release(acl
);
272 static int v9fs_remote_set_acl(struct dentry
*dentry
, const char *name
,
273 const void *value
, size_t size
,
279 case ACL_TYPE_ACCESS
:
280 full_name
= POSIX_ACL_XATTR_ACCESS
;
282 case ACL_TYPE_DEFAULT
:
283 full_name
= POSIX_ACL_XATTR_DEFAULT
;
288 return v9fs_xattr_set(dentry
, full_name
, value
, size
, flags
);
292 static int v9fs_xattr_set_acl(struct dentry
*dentry
, const char *name
,
293 const void *value
, size_t size
,
297 struct posix_acl
*acl
;
298 struct v9fs_session_info
*v9ses
;
299 struct inode
*inode
= dentry
->d_inode
;
301 if (strcmp(name
, "") != 0)
304 v9ses
= v9fs_inode2v9ses(dentry
->d_inode
);
306 * set the attribute on the remote. Without even looking at the
307 * xattr value. We leave it to the server to validate
309 if ((v9ses
->flags
& V9FS_ACCESS_MASK
) != V9FS_ACCESS_CLIENT
)
310 return v9fs_remote_set_acl(dentry
, name
,
311 value
, size
, flags
, type
);
313 if (S_ISLNK(inode
->i_mode
))
315 if (!is_owner_or_cap(inode
))
318 /* update the cached acl value */
319 acl
= posix_acl_from_xattr(value
, size
);
323 retval
= posix_acl_valid(acl
);
331 case ACL_TYPE_ACCESS
:
332 name
= POSIX_ACL_XATTR_ACCESS
;
334 mode_t mode
= inode
->i_mode
;
335 retval
= posix_acl_equiv_mode(acl
, &mode
);
342 * ACL can be represented
343 * by the mode bits. So don't
350 /* Updte the mode bits */
351 iattr
.ia_mode
= ((mode
& S_IALLUGO
) |
352 (inode
->i_mode
& ~S_IALLUGO
));
353 iattr
.ia_valid
= ATTR_MODE
;
354 /* FIXME should we update ctime ?
355 * What is the following setxattr update the
358 v9fs_vfs_setattr_dotl(dentry
, &iattr
);
362 case ACL_TYPE_DEFAULT
:
363 name
= POSIX_ACL_XATTR_DEFAULT
;
364 if (!S_ISDIR(inode
->i_mode
)) {
372 retval
= v9fs_xattr_set(dentry
, name
, value
, size
, flags
);
374 set_cached_acl(inode
, type
, acl
);
376 posix_acl_release(acl
);
380 const struct xattr_handler v9fs_xattr_acl_access_handler
= {
381 .prefix
= POSIX_ACL_XATTR_ACCESS
,
382 .flags
= ACL_TYPE_ACCESS
,
383 .get
= v9fs_xattr_get_acl
,
384 .set
= v9fs_xattr_set_acl
,
387 const struct xattr_handler v9fs_xattr_acl_default_handler
= {
388 .prefix
= POSIX_ACL_XATTR_DEFAULT
,
389 .flags
= ACL_TYPE_DEFAULT
,
390 .get
= v9fs_xattr_get_acl
,
391 .set
= v9fs_xattr_set_acl
,