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 posix_acl **p_acl;
40 ea_name = POSIX_ACL_XATTR_ACCESS;
41 p_acl = &inode->i_acl;
43 case ACL_TYPE_DEFAULT:
44 ea_name = POSIX_ACL_XATTR_DEFAULT;
45 p_acl = &inode->i_default_acl;
48 return ERR_PTR(-EINVAL);
51 if (*p_acl != ACL_NOT_CACHED)
52 return posix_acl_dup(*p_acl);
54 size = __jfs_getxattr(inode, ea_name, NULL, 0);
57 value = kmalloc(size, GFP_KERNEL);
59 return ERR_PTR(-ENOMEM);
60 size = __jfs_getxattr(inode, ea_name, value, size);
64 if (size == -ENODATA) {
70 acl = posix_acl_from_xattr(value, size);
72 *p_acl = posix_acl_dup(acl);
78 static int jfs_set_acl(tid_t tid, struct inode *inode, int type,
79 struct posix_acl *acl)
82 struct posix_acl **p_acl;
87 if (S_ISLNK(inode->i_mode))
92 ea_name = POSIX_ACL_XATTR_ACCESS;
93 p_acl = &inode->i_acl;
95 case ACL_TYPE_DEFAULT:
96 ea_name = POSIX_ACL_XATTR_DEFAULT;
97 p_acl = &inode->i_default_acl;
98 if (!S_ISDIR(inode->i_mode))
99 return acl ? -EACCES : 0;
105 size = posix_acl_xattr_size(acl->a_count);
106 value = kmalloc(size, GFP_KERNEL);
109 rc = posix_acl_to_xattr(acl, value, size);
113 rc = __jfs_setxattr(tid, inode, ea_name, value, size, 0);
118 if (*p_acl && (*p_acl != ACL_NOT_CACHED))
119 posix_acl_release(*p_acl);
120 *p_acl = posix_acl_dup(acl);
125 static int jfs_check_acl(struct inode *inode, int mask)
127 if (inode->i_acl == ACL_NOT_CACHED) {
128 struct posix_acl *acl = jfs_get_acl(inode, ACL_TYPE_ACCESS);
131 posix_acl_release(acl);
135 return posix_acl_permission(inode, inode->i_acl, mask);
139 int jfs_permission(struct inode *inode, int mask)
141 return generic_permission(inode, mask, jfs_check_acl);
144 int jfs_init_acl(tid_t tid, struct inode *inode, struct inode *dir)
146 struct posix_acl *acl = NULL;
147 struct posix_acl *clone;
151 if (S_ISLNK(inode->i_mode))
154 acl = jfs_get_acl(dir, ACL_TYPE_DEFAULT);
159 if (S_ISDIR(inode->i_mode)) {
160 rc = jfs_set_acl(tid, inode, ACL_TYPE_DEFAULT, acl);
164 clone = posix_acl_clone(acl, GFP_KERNEL);
169 mode = inode->i_mode;
170 rc = posix_acl_create_masq(clone, &mode);
172 inode->i_mode = mode;
174 rc = jfs_set_acl(tid, inode, ACL_TYPE_ACCESS,
177 posix_acl_release(clone);
179 posix_acl_release(acl);
181 inode->i_mode &= ~current_umask();
183 JFS_IP(inode)->mode2 = (JFS_IP(inode)->mode2 & 0xffff0000) |
189 static int jfs_acl_chmod(struct inode *inode)
191 struct posix_acl *acl, *clone;
194 if (S_ISLNK(inode->i_mode))
197 acl = jfs_get_acl(inode, ACL_TYPE_ACCESS);
198 if (IS_ERR(acl) || !acl)
201 clone = posix_acl_clone(acl, GFP_KERNEL);
202 posix_acl_release(acl);
206 rc = posix_acl_chmod_masq(clone, inode->i_mode);
208 tid_t tid = txBegin(inode->i_sb, 0);
209 mutex_lock(&JFS_IP(inode)->commit_mutex);
210 rc = jfs_set_acl(tid, inode, ACL_TYPE_ACCESS, clone);
212 rc = txCommit(tid, 1, &inode, 0);
214 mutex_unlock(&JFS_IP(inode)->commit_mutex);
217 posix_acl_release(clone);
221 int jfs_setattr(struct dentry *dentry, struct iattr *iattr)
223 struct inode *inode = dentry->d_inode;
226 rc = inode_change_ok(inode, iattr);
230 if ((iattr->ia_valid & ATTR_UID && iattr->ia_uid != inode->i_uid) ||
231 (iattr->ia_valid & ATTR_GID && iattr->ia_gid != inode->i_gid)) {
232 if (vfs_dq_transfer(inode, iattr))
236 rc = inode_setattr(inode, iattr);
238 if (!rc && (iattr->ia_valid & ATTR_MODE))
239 rc = jfs_acl_chmod(inode);