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 #ifdef CONFIG_BTRFS_FS_POSIX_ACL
33 static struct posix_acl
*btrfs_get_acl(struct inode
*inode
, int type
)
38 struct posix_acl
*acl
;
40 if (!IS_POSIXACL(inode
))
43 acl
= get_cached_acl(inode
, type
);
44 if (acl
!= ACL_NOT_CACHED
)
49 name
= POSIX_ACL_XATTR_ACCESS
;
51 case ACL_TYPE_DEFAULT
:
52 name
= POSIX_ACL_XATTR_DEFAULT
;
58 size
= __btrfs_getxattr(inode
, name
, "", 0);
60 value
= kzalloc(size
, GFP_NOFS
);
62 return ERR_PTR(-ENOMEM
);
63 size
= __btrfs_getxattr(inode
, name
, value
, size
);
65 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 (!is_owner_or_cap(dentry
->d_inode
))
174 if (!IS_POSIXACL(dentry
->d_inode
))
178 acl
= posix_acl_from_xattr(value
, size
);
182 } else if (IS_ERR(acl
)) {
187 ret
= btrfs_set_acl(NULL
, dentry
->d_inode
, acl
, type
);
189 posix_acl_release(acl
);
194 int btrfs_check_acl(struct inode
*inode
, int mask
)
196 struct posix_acl
*acl
;
199 acl
= btrfs_get_acl(inode
, ACL_TYPE_ACCESS
);
204 error
= posix_acl_permission(inode
, acl
, mask
);
205 posix_acl_release(acl
);
212 * btrfs_init_acl is already generally called under fs_mutex, so the locking
213 * stuff has been fixed to work with that. If the locking stuff changes, we
214 * need to re-evaluate the acl locking stuff.
216 int btrfs_init_acl(struct btrfs_trans_handle
*trans
,
217 struct inode
*inode
, struct inode
*dir
)
219 struct posix_acl
*acl
= NULL
;
222 /* this happens with subvols */
226 if (!S_ISLNK(inode
->i_mode
)) {
227 if (IS_POSIXACL(dir
)) {
228 acl
= btrfs_get_acl(dir
, ACL_TYPE_DEFAULT
);
234 inode
->i_mode
&= ~current_umask();
237 if (IS_POSIXACL(dir
) && acl
) {
238 struct posix_acl
*clone
;
241 if (S_ISDIR(inode
->i_mode
)) {
242 ret
= btrfs_set_acl(trans
, inode
, acl
,
247 clone
= posix_acl_clone(acl
, GFP_NOFS
);
252 mode
= inode
->i_mode
;
253 ret
= posix_acl_create_masq(clone
, &mode
);
255 inode
->i_mode
= mode
;
258 ret
= btrfs_set_acl(trans
, inode
, clone
,
262 posix_acl_release(clone
);
265 posix_acl_release(acl
);
270 int btrfs_acl_chmod(struct inode
*inode
)
272 struct posix_acl
*acl
, *clone
;
275 if (S_ISLNK(inode
->i_mode
))
278 if (!IS_POSIXACL(inode
))
281 acl
= btrfs_get_acl(inode
, ACL_TYPE_ACCESS
);
282 if (IS_ERR(acl
) || !acl
)
285 clone
= posix_acl_clone(acl
, GFP_KERNEL
);
286 posix_acl_release(acl
);
290 ret
= posix_acl_chmod_masq(clone
, inode
->i_mode
);
292 ret
= btrfs_set_acl(NULL
, inode
, clone
, ACL_TYPE_ACCESS
);
294 posix_acl_release(clone
);
299 const struct xattr_handler btrfs_xattr_acl_default_handler
= {
300 .prefix
= POSIX_ACL_XATTR_DEFAULT
,
301 .flags
= ACL_TYPE_DEFAULT
,
302 .get
= btrfs_xattr_acl_get
,
303 .set
= btrfs_xattr_acl_set
,
306 const struct xattr_handler btrfs_xattr_acl_access_handler
= {
307 .prefix
= POSIX_ACL_XATTR_ACCESS
,
308 .flags
= ACL_TYPE_ACCESS
,
309 .get
= btrfs_xattr_acl_get
,
310 .set
= btrfs_xattr_acl_set
,
313 #else /* CONFIG_BTRFS_FS_POSIX_ACL */
315 int btrfs_acl_chmod(struct inode
*inode
)
320 int btrfs_init_acl(struct btrfs_trans_handle
*trans
,
321 struct inode
*inode
, struct inode
*dir
)
326 #endif /* CONFIG_BTRFS_FS_POSIX_ACL */