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git.proxmox.com Git - mirror_ubuntu-jammy-kernel.git/blob - fs/jfs/acl.c
2 * Copyright (C) International Business Machines Corp., 2002-2004
3 * Copyright (C) Andreas Gruenbacher, 2001
4 * Copyright (C) Linus Torvalds, 1991, 1992
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
14 * the GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 #include <linux/sched.h>
23 #include <linux/quotaops.h>
24 #include <linux/posix_acl_xattr.h>
25 #include "jfs_incore.h"
26 #include "jfs_txnmgr.h"
27 #include "jfs_xattr.h"
30 static struct posix_acl
*jfs_get_acl(struct inode
*inode
, int type
)
32 struct posix_acl
*acl
;
34 struct jfs_inode_info
*ji
= JFS_IP(inode
);
35 struct posix_acl
**p_acl
;
41 ea_name
= POSIX_ACL_XATTR_ACCESS
;
44 case ACL_TYPE_DEFAULT
:
45 ea_name
= POSIX_ACL_XATTR_DEFAULT
;
46 p_acl
= &ji
->i_default_acl
;
49 return ERR_PTR(-EINVAL
);
52 if (*p_acl
!= JFS_ACL_NOT_CACHED
)
53 return posix_acl_dup(*p_acl
);
55 size
= __jfs_getxattr(inode
, ea_name
, NULL
, 0);
58 value
= kmalloc(size
, GFP_KERNEL
);
60 return ERR_PTR(-ENOMEM
);
61 size
= __jfs_getxattr(inode
, ea_name
, value
, size
);
65 if (size
== -ENODATA
) {
71 acl
= posix_acl_from_xattr(value
, size
);
73 *p_acl
= posix_acl_dup(acl
);
79 static int jfs_set_acl(tid_t tid
, struct inode
*inode
, int type
,
80 struct posix_acl
*acl
)
83 struct jfs_inode_info
*ji
= JFS_IP(inode
);
84 struct posix_acl
**p_acl
;
89 if (S_ISLNK(inode
->i_mode
))
94 ea_name
= POSIX_ACL_XATTR_ACCESS
;
97 case ACL_TYPE_DEFAULT
:
98 ea_name
= POSIX_ACL_XATTR_DEFAULT
;
99 p_acl
= &ji
->i_default_acl
;
100 if (!S_ISDIR(inode
->i_mode
))
101 return acl
? -EACCES
: 0;
107 size
= posix_acl_xattr_size(acl
->a_count
);
108 value
= kmalloc(size
, GFP_KERNEL
);
111 rc
= posix_acl_to_xattr(acl
, value
, size
);
115 rc
= __jfs_setxattr(tid
, inode
, ea_name
, value
, size
, 0);
120 if (*p_acl
&& (*p_acl
!= JFS_ACL_NOT_CACHED
))
121 posix_acl_release(*p_acl
);
122 *p_acl
= posix_acl_dup(acl
);
127 static int jfs_check_acl(struct inode
*inode
, int mask
)
129 struct jfs_inode_info
*ji
= JFS_IP(inode
);
131 if (ji
->i_acl
== JFS_ACL_NOT_CACHED
) {
132 struct posix_acl
*acl
= jfs_get_acl(inode
, ACL_TYPE_ACCESS
);
135 posix_acl_release(acl
);
139 return posix_acl_permission(inode
, ji
->i_acl
, mask
);
143 int jfs_permission(struct inode
*inode
, int mask
, struct nameidata
*nd
)
145 return generic_permission(inode
, mask
, jfs_check_acl
);
148 int jfs_init_acl(tid_t tid
, struct inode
*inode
, struct inode
*dir
)
150 struct posix_acl
*acl
= NULL
;
151 struct posix_acl
*clone
;
155 if (S_ISLNK(inode
->i_mode
))
158 acl
= jfs_get_acl(dir
, ACL_TYPE_DEFAULT
);
163 if (S_ISDIR(inode
->i_mode
)) {
164 rc
= jfs_set_acl(tid
, inode
, ACL_TYPE_DEFAULT
, acl
);
168 clone
= posix_acl_clone(acl
, GFP_KERNEL
);
173 mode
= inode
->i_mode
;
174 rc
= posix_acl_create_masq(clone
, &mode
);
176 inode
->i_mode
= mode
;
178 rc
= jfs_set_acl(tid
, inode
, ACL_TYPE_ACCESS
,
181 posix_acl_release(clone
);
183 posix_acl_release(acl
);
185 inode
->i_mode
&= ~current
->fs
->umask
;
187 JFS_IP(inode
)->mode2
= (JFS_IP(inode
)->mode2
& 0xffff0000) |
193 static int jfs_acl_chmod(struct inode
*inode
)
195 struct posix_acl
*acl
, *clone
;
198 if (S_ISLNK(inode
->i_mode
))
201 acl
= jfs_get_acl(inode
, ACL_TYPE_ACCESS
);
202 if (IS_ERR(acl
) || !acl
)
205 clone
= posix_acl_clone(acl
, GFP_KERNEL
);
206 posix_acl_release(acl
);
210 rc
= posix_acl_chmod_masq(clone
, inode
->i_mode
);
212 tid_t tid
= txBegin(inode
->i_sb
, 0);
213 mutex_lock(&JFS_IP(inode
)->commit_mutex
);
214 rc
= jfs_set_acl(tid
, inode
, ACL_TYPE_ACCESS
, clone
);
216 rc
= txCommit(tid
, 1, &inode
, 0);
218 mutex_unlock(&JFS_IP(inode
)->commit_mutex
);
221 posix_acl_release(clone
);
225 int jfs_setattr(struct dentry
*dentry
, struct iattr
*iattr
)
227 struct inode
*inode
= dentry
->d_inode
;
230 rc
= inode_change_ok(inode
, iattr
);
234 if ((iattr
->ia_valid
& ATTR_UID
&& iattr
->ia_uid
!= inode
->i_uid
) ||
235 (iattr
->ia_valid
& ATTR_GID
&& iattr
->ia_gid
!= inode
->i_gid
)) {
236 if (DQUOT_TRANSFER(inode
, iattr
))
240 rc
= inode_setattr(inode
, iattr
);
242 if (!rc
&& (iattr
->ia_valid
& ATTR_MODE
))
243 rc
= jfs_acl_chmod(inode
);