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 acl
= get_cached_acl(inode
, type
);
41 if (acl
!= ACL_NOT_CACHED
)
46 name
= POSIX_ACL_XATTR_ACCESS
;
48 case ACL_TYPE_DEFAULT
:
49 name
= POSIX_ACL_XATTR_DEFAULT
;
55 size
= __btrfs_getxattr(inode
, name
, "", 0);
57 value
= kzalloc(size
, GFP_NOFS
);
59 return ERR_PTR(-ENOMEM
);
60 size
= __btrfs_getxattr(inode
, name
, value
, size
);
62 acl
= posix_acl_from_xattr(value
, size
);
63 set_cached_acl(inode
, type
, acl
);
66 } else if (size
== -ENOENT
|| size
== -ENODATA
|| size
== 0) {
67 /* FIXME, who returns -ENOENT? I think nobody */
69 set_cached_acl(inode
, type
, acl
);
77 static int btrfs_xattr_acl_get(struct dentry
*dentry
, const char *name
,
78 void *value
, size_t size
, int type
)
80 struct posix_acl
*acl
;
83 acl
= btrfs_get_acl(dentry
->d_inode
, type
);
89 ret
= posix_acl_to_xattr(acl
, value
, size
);
90 posix_acl_release(acl
);
96 * Needs to be called with fs_mutex held
98 static int btrfs_set_acl(struct btrfs_trans_handle
*trans
,
99 struct inode
*inode
, struct posix_acl
*acl
, int type
)
107 ret
= posix_acl_valid(acl
);
114 case ACL_TYPE_ACCESS
:
115 mode
= inode
->i_mode
;
116 name
= POSIX_ACL_XATTR_ACCESS
;
118 ret
= posix_acl_equiv_mode(acl
, &mode
);
121 inode
->i_mode
= mode
;
125 case ACL_TYPE_DEFAULT
:
126 if (!S_ISDIR(inode
->i_mode
))
127 return acl
? -EINVAL
: 0;
128 name
= POSIX_ACL_XATTR_DEFAULT
;
135 size
= posix_acl_xattr_size(acl
->a_count
);
136 value
= kmalloc(size
, GFP_NOFS
);
142 ret
= posix_acl_to_xattr(acl
, value
, size
);
147 ret
= __btrfs_setxattr(trans
, inode
, name
, value
, size
, 0);
152 set_cached_acl(inode
, type
, acl
);
157 static int btrfs_xattr_acl_set(struct dentry
*dentry
, const char *name
,
158 const void *value
, size_t size
, int flags
, int type
)
161 struct posix_acl
*acl
= NULL
;
163 if (!is_owner_or_cap(dentry
->d_inode
))
167 acl
= posix_acl_from_xattr(value
, size
);
171 } else if (IS_ERR(acl
)) {
176 ret
= btrfs_set_acl(NULL
, dentry
->d_inode
, acl
, type
);
178 posix_acl_release(acl
);
183 int btrfs_check_acl(struct inode
*inode
, int mask
)
185 struct posix_acl
*acl
;
188 acl
= btrfs_get_acl(inode
, ACL_TYPE_ACCESS
);
193 error
= posix_acl_permission(inode
, acl
, mask
);
194 posix_acl_release(acl
);
201 * btrfs_init_acl is already generally called under fs_mutex, so the locking
202 * stuff has been fixed to work with that. If the locking stuff changes, we
203 * need to re-evaluate the acl locking stuff.
205 int btrfs_init_acl(struct btrfs_trans_handle
*trans
,
206 struct inode
*inode
, struct inode
*dir
)
208 struct posix_acl
*acl
= NULL
;
211 /* this happens with subvols */
215 if (!S_ISLNK(inode
->i_mode
)) {
216 if (IS_POSIXACL(dir
)) {
217 acl
= btrfs_get_acl(dir
, ACL_TYPE_DEFAULT
);
223 inode
->i_mode
&= ~current_umask();
226 if (IS_POSIXACL(dir
) && acl
) {
227 struct posix_acl
*clone
;
230 if (S_ISDIR(inode
->i_mode
)) {
231 ret
= btrfs_set_acl(trans
, inode
, acl
,
236 clone
= posix_acl_clone(acl
, GFP_NOFS
);
241 mode
= inode
->i_mode
;
242 ret
= posix_acl_create_masq(clone
, &mode
);
244 inode
->i_mode
= mode
;
247 ret
= btrfs_set_acl(trans
, inode
, clone
,
251 posix_acl_release(clone
);
254 posix_acl_release(acl
);
259 int btrfs_acl_chmod(struct inode
*inode
)
261 struct posix_acl
*acl
, *clone
;
264 if (S_ISLNK(inode
->i_mode
))
267 if (!IS_POSIXACL(inode
))
270 acl
= btrfs_get_acl(inode
, ACL_TYPE_ACCESS
);
271 if (IS_ERR(acl
) || !acl
)
274 clone
= posix_acl_clone(acl
, GFP_KERNEL
);
275 posix_acl_release(acl
);
279 ret
= posix_acl_chmod_masq(clone
, inode
->i_mode
);
281 ret
= btrfs_set_acl(NULL
, inode
, clone
, ACL_TYPE_ACCESS
);
283 posix_acl_release(clone
);
288 struct xattr_handler btrfs_xattr_acl_default_handler
= {
289 .prefix
= POSIX_ACL_XATTR_DEFAULT
,
290 .flags
= ACL_TYPE_DEFAULT
,
291 .get
= btrfs_xattr_acl_get
,
292 .set
= btrfs_xattr_acl_set
,
295 struct xattr_handler btrfs_xattr_acl_access_handler
= {
296 .prefix
= POSIX_ACL_XATTR_ACCESS
,
297 .flags
= ACL_TYPE_ACCESS
,
298 .get
= btrfs_xattr_acl_get
,
299 .set
= btrfs_xattr_acl_set
,
302 #else /* CONFIG_BTRFS_FS_POSIX_ACL */
304 int btrfs_acl_chmod(struct inode
*inode
)
309 int btrfs_init_acl(struct btrfs_trans_handle
*trans
,
310 struct inode
*inode
, struct inode
*dir
)
315 #endif /* CONFIG_BTRFS_FS_POSIX_ACL */