2 * Copyright (C) 2007 Red Hat. All rights reserved.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
20 #include <linux/string.h>
21 #include <linux/xattr.h>
22 #include <linux/posix_acl_xattr.h>
23 #include <linux/posix_acl.h>
24 #include <linux/sched.h>
25 #include <linux/slab.h>
28 #include "btrfs_inode.h"
31 static struct posix_acl
*btrfs_get_acl(struct inode
*inode
, int type
)
36 struct posix_acl
*acl
;
38 if (!IS_POSIXACL(inode
))
41 acl
= get_cached_acl(inode
, type
);
42 if (acl
!= ACL_NOT_CACHED
)
47 name
= POSIX_ACL_XATTR_ACCESS
;
49 case ACL_TYPE_DEFAULT
:
50 name
= POSIX_ACL_XATTR_DEFAULT
;
56 size
= __btrfs_getxattr(inode
, name
, "", 0);
58 value
= kzalloc(size
, GFP_NOFS
);
60 return ERR_PTR(-ENOMEM
);
61 size
= __btrfs_getxattr(inode
, name
, value
, size
);
63 acl
= posix_acl_from_xattr(value
, size
);
68 set_cached_acl(inode
, type
, acl
);
71 } else if (size
== -ENOENT
|| size
== -ENODATA
|| size
== 0) {
72 /* FIXME, who returns -ENOENT? I think nobody */
74 set_cached_acl(inode
, type
, acl
);
82 static int btrfs_xattr_acl_get(struct dentry
*dentry
, const char *name
,
83 void *value
, size_t size
, int type
)
85 struct posix_acl
*acl
;
88 if (!IS_POSIXACL(dentry
->d_inode
))
91 acl
= btrfs_get_acl(dentry
->d_inode
, type
);
97 ret
= posix_acl_to_xattr(acl
, value
, size
);
98 posix_acl_release(acl
);
104 * Needs to be called with fs_mutex held
106 static int btrfs_set_acl(struct btrfs_trans_handle
*trans
,
107 struct inode
*inode
, struct posix_acl
*acl
, int type
)
115 ret
= posix_acl_valid(acl
);
122 case ACL_TYPE_ACCESS
:
123 mode
= inode
->i_mode
;
124 name
= POSIX_ACL_XATTR_ACCESS
;
126 ret
= posix_acl_equiv_mode(acl
, &mode
);
129 inode
->i_mode
= mode
;
133 case ACL_TYPE_DEFAULT
:
134 if (!S_ISDIR(inode
->i_mode
))
135 return acl
? -EINVAL
: 0;
136 name
= POSIX_ACL_XATTR_DEFAULT
;
143 size
= posix_acl_xattr_size(acl
->a_count
);
144 value
= kmalloc(size
, GFP_NOFS
);
150 ret
= posix_acl_to_xattr(acl
, value
, size
);
155 ret
= __btrfs_setxattr(trans
, inode
, name
, value
, size
, 0);
160 set_cached_acl(inode
, type
, acl
);
165 static int btrfs_xattr_acl_set(struct dentry
*dentry
, const char *name
,
166 const void *value
, size_t size
, int flags
, int type
)
169 struct posix_acl
*acl
= NULL
;
171 if (!inode_owner_or_capable(dentry
->d_inode
))
174 if (!IS_POSIXACL(dentry
->d_inode
))
178 acl
= posix_acl_from_xattr(value
, size
);
183 ret
= posix_acl_valid(acl
);
189 ret
= btrfs_set_acl(NULL
, dentry
->d_inode
, acl
, type
);
191 posix_acl_release(acl
);
196 int btrfs_check_acl(struct inode
*inode
, int mask
, unsigned int flags
)
200 if (flags
& IPERM_FLAG_RCU
) {
201 if (!negative_cached_acl(inode
, ACL_TYPE_ACCESS
))
205 struct posix_acl
*acl
;
206 acl
= btrfs_get_acl(inode
, ACL_TYPE_ACCESS
);
210 error
= posix_acl_permission(inode
, acl
, mask
);
211 posix_acl_release(acl
);
219 * btrfs_init_acl is already generally called under fs_mutex, so the locking
220 * stuff has been fixed to work with that. If the locking stuff changes, we
221 * need to re-evaluate the acl locking stuff.
223 int btrfs_init_acl(struct btrfs_trans_handle
*trans
,
224 struct inode
*inode
, struct inode
*dir
)
226 struct posix_acl
*acl
= NULL
;
229 /* this happens with subvols */
233 if (!S_ISLNK(inode
->i_mode
)) {
234 if (IS_POSIXACL(dir
)) {
235 acl
= btrfs_get_acl(dir
, ACL_TYPE_DEFAULT
);
241 inode
->i_mode
&= ~current_umask();
244 if (IS_POSIXACL(dir
) && acl
) {
245 struct posix_acl
*clone
;
248 if (S_ISDIR(inode
->i_mode
)) {
249 ret
= btrfs_set_acl(trans
, inode
, acl
,
254 clone
= posix_acl_clone(acl
, GFP_NOFS
);
259 mode
= inode
->i_mode
;
260 ret
= posix_acl_create_masq(clone
, &mode
);
262 inode
->i_mode
= mode
;
265 ret
= btrfs_set_acl(trans
, inode
, clone
,
269 posix_acl_release(clone
);
272 posix_acl_release(acl
);
277 int btrfs_acl_chmod(struct inode
*inode
)
279 struct posix_acl
*acl
, *clone
;
282 if (S_ISLNK(inode
->i_mode
))
285 if (!IS_POSIXACL(inode
))
288 acl
= btrfs_get_acl(inode
, ACL_TYPE_ACCESS
);
289 if (IS_ERR_OR_NULL(acl
))
292 clone
= posix_acl_clone(acl
, GFP_KERNEL
);
293 posix_acl_release(acl
);
297 ret
= posix_acl_chmod_masq(clone
, inode
->i_mode
);
299 ret
= btrfs_set_acl(NULL
, inode
, clone
, ACL_TYPE_ACCESS
);
301 posix_acl_release(clone
);
306 const struct xattr_handler btrfs_xattr_acl_default_handler
= {
307 .prefix
= POSIX_ACL_XATTR_DEFAULT
,
308 .flags
= ACL_TYPE_DEFAULT
,
309 .get
= btrfs_xattr_acl_get
,
310 .set
= btrfs_xattr_acl_set
,
313 const struct xattr_handler btrfs_xattr_acl_access_handler
= {
314 .prefix
= POSIX_ACL_XATTR_ACCESS
,
315 .flags
= ACL_TYPE_ACCESS
,
316 .get
= btrfs_xattr_acl_get
,
317 .set
= btrfs_xattr_acl_set
,