blob: 461e4934ca7c280553190f9c7b34cc296a95a23a [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Copyright (C) International Business Machines Corp., 2002-2004
3 * Copyright (C) Andreas Gruenbacher, 2001
4 * Copyright (C) Linus Torvalds, 1991, 1992
5 *
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.
10 *
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.
15 *
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
19 */
20
21#include <linux/sched.h>
22#include <linux/fs.h>
23#include <linux/quotaops.h>
Christoph Hellwig9a59f452005-06-23 00:10:19 -070024#include <linux/posix_acl_xattr.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#include "jfs_incore.h"
Dave Kleikamp4f4b4012005-09-01 09:02:43 -050026#include "jfs_txnmgr.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#include "jfs_xattr.h"
28#include "jfs_acl.h"
29
30static struct posix_acl *jfs_get_acl(struct inode *inode, int type)
31{
32 struct posix_acl *acl;
33 char *ea_name;
34 struct jfs_inode_info *ji = JFS_IP(inode);
35 struct posix_acl **p_acl;
36 int size;
37 char *value = NULL;
38
39 switch(type) {
40 case ACL_TYPE_ACCESS:
Christoph Hellwig9a59f452005-06-23 00:10:19 -070041 ea_name = POSIX_ACL_XATTR_ACCESS;
Linus Torvalds1da177e2005-04-16 15:20:36 -070042 p_acl = &ji->i_acl;
43 break;
44 case ACL_TYPE_DEFAULT:
Christoph Hellwig9a59f452005-06-23 00:10:19 -070045 ea_name = POSIX_ACL_XATTR_DEFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -070046 p_acl = &ji->i_default_acl;
47 break;
48 default:
49 return ERR_PTR(-EINVAL);
50 }
51
52 if (*p_acl != JFS_ACL_NOT_CACHED)
53 return posix_acl_dup(*p_acl);
54
55 size = __jfs_getxattr(inode, ea_name, NULL, 0);
56
57 if (size > 0) {
58 value = kmalloc(size, GFP_KERNEL);
59 if (!value)
60 return ERR_PTR(-ENOMEM);
61 size = __jfs_getxattr(inode, ea_name, value, size);
62 }
63
64 if (size < 0) {
65 if (size == -ENODATA) {
66 *p_acl = NULL;
67 acl = NULL;
68 } else
69 acl = ERR_PTR(size);
70 } else {
71 acl = posix_acl_from_xattr(value, size);
72 if (!IS_ERR(acl))
73 *p_acl = posix_acl_dup(acl);
74 }
Jesper Juhl259692b2005-05-09 10:47:14 -050075 kfree(value);
Linus Torvalds1da177e2005-04-16 15:20:36 -070076 return acl;
77}
78
Dave Kleikamp4f4b4012005-09-01 09:02:43 -050079static int jfs_set_acl(tid_t tid, struct inode *inode, int type,
80 struct posix_acl *acl)
Linus Torvalds1da177e2005-04-16 15:20:36 -070081{
82 char *ea_name;
83 struct jfs_inode_info *ji = JFS_IP(inode);
84 struct posix_acl **p_acl;
85 int rc;
86 int size = 0;
87 char *value = NULL;
88
89 if (S_ISLNK(inode->i_mode))
90 return -EOPNOTSUPP;
91
92 switch(type) {
93 case ACL_TYPE_ACCESS:
Christoph Hellwig9a59f452005-06-23 00:10:19 -070094 ea_name = POSIX_ACL_XATTR_ACCESS;
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 p_acl = &ji->i_acl;
96 break;
97 case ACL_TYPE_DEFAULT:
Christoph Hellwig9a59f452005-06-23 00:10:19 -070098 ea_name = POSIX_ACL_XATTR_DEFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 p_acl = &ji->i_default_acl;
100 if (!S_ISDIR(inode->i_mode))
101 return acl ? -EACCES : 0;
102 break;
103 default:
104 return -EINVAL;
105 }
106 if (acl) {
Christoph Hellwig9a59f452005-06-23 00:10:19 -0700107 size = posix_acl_xattr_size(acl->a_count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 value = kmalloc(size, GFP_KERNEL);
109 if (!value)
110 return -ENOMEM;
111 rc = posix_acl_to_xattr(acl, value, size);
112 if (rc < 0)
113 goto out;
114 }
Dave Kleikamp4f4b4012005-09-01 09:02:43 -0500115 rc = __jfs_setxattr(tid, inode, ea_name, value, size, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116out:
Jesper Juhl259692b2005-05-09 10:47:14 -0500117 kfree(value);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118
119 if (!rc) {
120 if (*p_acl && (*p_acl != JFS_ACL_NOT_CACHED))
121 posix_acl_release(*p_acl);
122 *p_acl = posix_acl_dup(acl);
123 }
124 return rc;
125}
126
127static int jfs_check_acl(struct inode *inode, int mask)
128{
129 struct jfs_inode_info *ji = JFS_IP(inode);
130
131 if (ji->i_acl == JFS_ACL_NOT_CACHED) {
132 struct posix_acl *acl = jfs_get_acl(inode, ACL_TYPE_ACCESS);
133 if (IS_ERR(acl))
134 return PTR_ERR(acl);
135 posix_acl_release(acl);
136 }
137
138 if (ji->i_acl)
139 return posix_acl_permission(inode, ji->i_acl, mask);
140 return -EAGAIN;
141}
142
143int jfs_permission(struct inode *inode, int mask, struct nameidata *nd)
144{
145 return generic_permission(inode, mask, jfs_check_acl);
146}
147
Dave Kleikamp4f4b4012005-09-01 09:02:43 -0500148int jfs_init_acl(tid_t tid, struct inode *inode, struct inode *dir)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149{
150 struct posix_acl *acl = NULL;
151 struct posix_acl *clone;
152 mode_t mode;
153 int rc = 0;
154
155 if (S_ISLNK(inode->i_mode))
156 return 0;
157
158 acl = jfs_get_acl(dir, ACL_TYPE_DEFAULT);
159 if (IS_ERR(acl))
160 return PTR_ERR(acl);
161
162 if (acl) {
163 if (S_ISDIR(inode->i_mode)) {
Dave Kleikamp4f4b4012005-09-01 09:02:43 -0500164 rc = jfs_set_acl(tid, inode, ACL_TYPE_DEFAULT, acl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 if (rc)
166 goto cleanup;
167 }
168 clone = posix_acl_clone(acl, GFP_KERNEL);
169 if (!clone) {
170 rc = -ENOMEM;
171 goto cleanup;
172 }
173 mode = inode->i_mode;
174 rc = posix_acl_create_masq(clone, &mode);
175 if (rc >= 0) {
176 inode->i_mode = mode;
177 if (rc > 0)
Dave Kleikamp4f4b4012005-09-01 09:02:43 -0500178 rc = jfs_set_acl(tid, inode, ACL_TYPE_ACCESS,
179 clone);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 }
181 posix_acl_release(clone);
182cleanup:
183 posix_acl_release(acl);
184 } else
185 inode->i_mode &= ~current->fs->umask;
186
187 return rc;
188}
189
190static int jfs_acl_chmod(struct inode *inode)
191{
192 struct posix_acl *acl, *clone;
193 int rc;
194
195 if (S_ISLNK(inode->i_mode))
196 return -EOPNOTSUPP;
197
198 acl = jfs_get_acl(inode, ACL_TYPE_ACCESS);
199 if (IS_ERR(acl) || !acl)
200 return PTR_ERR(acl);
201
202 clone = posix_acl_clone(acl, GFP_KERNEL);
203 posix_acl_release(acl);
204 if (!clone)
205 return -ENOMEM;
206
207 rc = posix_acl_chmod_masq(clone, inode->i_mode);
Dave Kleikamp4f4b4012005-09-01 09:02:43 -0500208 if (!rc) {
209 tid_t tid = txBegin(inode->i_sb, 0);
210 down(&JFS_IP(inode)->commit_sem);
211 rc = jfs_set_acl(tid, inode, ACL_TYPE_ACCESS, clone);
212 if (!rc)
213 rc = txCommit(tid, 1, &inode, 0);
214 txEnd(tid);
215 up(&JFS_IP(inode)->commit_sem);
216 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217
218 posix_acl_release(clone);
219 return rc;
220}
221
222int jfs_setattr(struct dentry *dentry, struct iattr *iattr)
223{
224 struct inode *inode = dentry->d_inode;
225 int rc;
226
227 rc = inode_change_ok(inode, iattr);
228 if (rc)
229 return rc;
230
231 if ((iattr->ia_valid & ATTR_UID && iattr->ia_uid != inode->i_uid) ||
232 (iattr->ia_valid & ATTR_GID && iattr->ia_gid != inode->i_gid)) {
233 if (DQUOT_TRANSFER(inode, iattr))
234 return -EDQUOT;
235 }
236
237 rc = inode_setattr(inode, iattr);
238
239 if (!rc && (iattr->ia_valid & ATTR_MODE))
240 rc = jfs_acl_chmod(inode);
241
242 return rc;
243}