1 /*
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/slab.h>
23 #include <linux/fs.h>
24 #include <linux/posix_acl_xattr.h>
25 #include "jfs_incore.h"
26 #include "jfs_txnmgr.h"
27 #include "jfs_xattr.h"
28 #include "jfs_acl.h"
29
jfs_get_acl(struct inode * inode,int type)30 struct posix_acl *jfs_get_acl(struct inode *inode, int type)
31 {
32 struct posix_acl *acl;
33 char *ea_name;
34 int size;
35 char *value = NULL;
36
37 switch(type) {
38 case ACL_TYPE_ACCESS:
39 ea_name = XATTR_NAME_POSIX_ACL_ACCESS;
40 break;
41 case ACL_TYPE_DEFAULT:
42 ea_name = XATTR_NAME_POSIX_ACL_DEFAULT;
43 break;
44 default:
45 return ERR_PTR(-EINVAL);
46 }
47
48 size = __jfs_getxattr(inode, ea_name, NULL, 0);
49
50 if (size > 0) {
51 value = kmalloc(size, GFP_KERNEL);
52 if (!value)
53 return ERR_PTR(-ENOMEM);
54 size = __jfs_getxattr(inode, ea_name, value, size);
55 }
56
57 if (size < 0) {
58 if (size == -ENODATA)
59 acl = NULL;
60 else
61 acl = ERR_PTR(size);
62 } else {
63 acl = posix_acl_from_xattr(&init_user_ns, value, size);
64 }
65 kfree(value);
66 return acl;
67 }
68
__jfs_set_acl(tid_t tid,struct inode * inode,int type,struct posix_acl * acl)69 static int __jfs_set_acl(tid_t tid, struct inode *inode, int type,
70 struct posix_acl *acl)
71 {
72 char *ea_name;
73 int rc;
74 int size = 0;
75 char *value = NULL;
76
77 switch (type) {
78 case ACL_TYPE_ACCESS:
79 ea_name = XATTR_NAME_POSIX_ACL_ACCESS;
80 break;
81 case ACL_TYPE_DEFAULT:
82 ea_name = XATTR_NAME_POSIX_ACL_DEFAULT;
83 break;
84 default:
85 return -EINVAL;
86 }
87
88 if (acl) {
89 size = posix_acl_xattr_size(acl->a_count);
90 value = kmalloc(size, GFP_KERNEL);
91 if (!value)
92 return -ENOMEM;
93 rc = posix_acl_to_xattr(&init_user_ns, acl, value, size);
94 if (rc < 0)
95 goto out;
96 }
97 rc = __jfs_setxattr(tid, inode, ea_name, value, size, 0);
98 out:
99 kfree(value);
100
101 if (!rc)
102 set_cached_acl(inode, type, acl);
103
104 return rc;
105 }
106
jfs_set_acl(struct inode * inode,struct posix_acl * acl,int type)107 int jfs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
108 {
109 int rc;
110 tid_t tid;
111
112 tid = txBegin(inode->i_sb, 0);
113 mutex_lock(&JFS_IP(inode)->commit_mutex);
114 if (type == ACL_TYPE_ACCESS && acl) {
115 rc = posix_acl_update_mode(inode, &inode->i_mode, &acl);
116 if (rc)
117 goto end_tx;
118 inode->i_ctime = current_time(inode);
119 mark_inode_dirty(inode);
120 }
121 rc = __jfs_set_acl(tid, inode, type, acl);
122 if (!rc)
123 rc = txCommit(tid, 1, &inode, 0);
124 end_tx:
125 txEnd(tid);
126 mutex_unlock(&JFS_IP(inode)->commit_mutex);
127 return rc;
128 }
129
jfs_init_acl(tid_t tid,struct inode * inode,struct inode * dir)130 int jfs_init_acl(tid_t tid, struct inode *inode, struct inode *dir)
131 {
132 struct posix_acl *default_acl, *acl;
133 int rc = 0;
134
135 rc = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl);
136 if (rc)
137 return rc;
138
139 if (default_acl) {
140 rc = __jfs_set_acl(tid, inode, ACL_TYPE_DEFAULT, default_acl);
141 posix_acl_release(default_acl);
142 }
143
144 if (acl) {
145 if (!rc)
146 rc = __jfs_set_acl(tid, inode, ACL_TYPE_ACCESS, acl);
147 posix_acl_release(acl);
148 }
149
150 JFS_IP(inode)->mode2 = (JFS_IP(inode)->mode2 & 0xffff0000) |
151 inode->i_mode;
152
153 return rc;
154 }
155