Commit | Line | Data |
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1da177e4 LT |
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 | |
63f83c9f | 8 | * the Free Software Foundation; either version 2 of the License, or |
1da177e4 | 9 | * (at your option) any later version. |
63f83c9f | 10 | * |
1da177e4 LT |
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 | |
63f83c9f | 17 | * along with this program; if not, write to the Free Software |
1da177e4 LT |
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> | |
9a59f452 | 23 | #include <linux/posix_acl_xattr.h> |
1da177e4 | 24 | #include "jfs_incore.h" |
4f4b401b | 25 | #include "jfs_txnmgr.h" |
1da177e4 LT |
26 | #include "jfs_xattr.h" |
27 | #include "jfs_acl.h" | |
28 | ||
29 | static struct posix_acl *jfs_get_acl(struct inode *inode, int type) | |
30 | { | |
31 | struct posix_acl *acl; | |
32 | char *ea_name; | |
1da177e4 LT |
33 | int size; |
34 | char *value = NULL; | |
35 | ||
073aaa1b AV |
36 | acl = get_cached_acl(inode, type); |
37 | if (acl != ACL_NOT_CACHED) | |
38 | return acl; | |
39 | ||
1da177e4 LT |
40 | switch(type) { |
41 | case ACL_TYPE_ACCESS: | |
9a59f452 | 42 | ea_name = POSIX_ACL_XATTR_ACCESS; |
1da177e4 LT |
43 | break; |
44 | case ACL_TYPE_DEFAULT: | |
9a59f452 | 45 | ea_name = POSIX_ACL_XATTR_DEFAULT; |
1da177e4 LT |
46 | break; |
47 | default: | |
48 | return ERR_PTR(-EINVAL); | |
49 | } | |
50 | ||
1da177e4 LT |
51 | size = __jfs_getxattr(inode, ea_name, NULL, 0); |
52 | ||
53 | if (size > 0) { | |
54 | value = kmalloc(size, GFP_KERNEL); | |
55 | if (!value) | |
56 | return ERR_PTR(-ENOMEM); | |
57 | size = __jfs_getxattr(inode, ea_name, value, size); | |
58 | } | |
59 | ||
60 | if (size < 0) { | |
073aaa1b | 61 | if (size == -ENODATA) |
1da177e4 | 62 | acl = NULL; |
073aaa1b | 63 | else |
1da177e4 LT |
64 | acl = ERR_PTR(size); |
65 | } else { | |
66 | acl = posix_acl_from_xattr(value, size); | |
1da177e4 | 67 | } |
259692bd | 68 | kfree(value); |
4a19fb11 | 69 | if (!IS_ERR(acl)) |
073aaa1b | 70 | set_cached_acl(inode, type, acl); |
1da177e4 LT |
71 | return acl; |
72 | } | |
73 | ||
4f4b401b DK |
74 | static int jfs_set_acl(tid_t tid, struct inode *inode, int type, |
75 | struct posix_acl *acl) | |
1da177e4 LT |
76 | { |
77 | char *ea_name; | |
1da177e4 LT |
78 | int rc; |
79 | int size = 0; | |
80 | char *value = NULL; | |
81 | ||
82 | if (S_ISLNK(inode->i_mode)) | |
83 | return -EOPNOTSUPP; | |
84 | ||
85 | switch(type) { | |
86 | case ACL_TYPE_ACCESS: | |
9a59f452 | 87 | ea_name = POSIX_ACL_XATTR_ACCESS; |
1da177e4 LT |
88 | break; |
89 | case ACL_TYPE_DEFAULT: | |
9a59f452 | 90 | ea_name = POSIX_ACL_XATTR_DEFAULT; |
1da177e4 LT |
91 | if (!S_ISDIR(inode->i_mode)) |
92 | return acl ? -EACCES : 0; | |
93 | break; | |
94 | default: | |
95 | return -EINVAL; | |
96 | } | |
97 | if (acl) { | |
9a59f452 | 98 | size = posix_acl_xattr_size(acl->a_count); |
1da177e4 LT |
99 | value = kmalloc(size, GFP_KERNEL); |
100 | if (!value) | |
101 | return -ENOMEM; | |
102 | rc = posix_acl_to_xattr(acl, value, size); | |
103 | if (rc < 0) | |
104 | goto out; | |
105 | } | |
4f4b401b | 106 | rc = __jfs_setxattr(tid, inode, ea_name, value, size, 0); |
1da177e4 | 107 | out: |
259692bd | 108 | kfree(value); |
1da177e4 | 109 | |
073aaa1b AV |
110 | if (!rc) |
111 | set_cached_acl(inode, type, acl); | |
112 | ||
1da177e4 LT |
113 | return rc; |
114 | } | |
115 | ||
18f4c644 | 116 | int jfs_check_acl(struct inode *inode, int mask) |
1da177e4 | 117 | { |
d5bb68ad AV |
118 | struct posix_acl *acl = jfs_get_acl(inode, ACL_TYPE_ACCESS); |
119 | ||
120 | if (IS_ERR(acl)) | |
121 | return PTR_ERR(acl); | |
122 | if (acl) { | |
123 | int error = posix_acl_permission(inode, acl, mask); | |
1da177e4 | 124 | posix_acl_release(acl); |
d5bb68ad | 125 | return error; |
1da177e4 LT |
126 | } |
127 | ||
1da177e4 LT |
128 | return -EAGAIN; |
129 | } | |
130 | ||
4f4b401b | 131 | int jfs_init_acl(tid_t tid, struct inode *inode, struct inode *dir) |
1da177e4 LT |
132 | { |
133 | struct posix_acl *acl = NULL; | |
134 | struct posix_acl *clone; | |
135 | mode_t mode; | |
136 | int rc = 0; | |
137 | ||
138 | if (S_ISLNK(inode->i_mode)) | |
139 | return 0; | |
140 | ||
141 | acl = jfs_get_acl(dir, ACL_TYPE_DEFAULT); | |
142 | if (IS_ERR(acl)) | |
143 | return PTR_ERR(acl); | |
144 | ||
145 | if (acl) { | |
146 | if (S_ISDIR(inode->i_mode)) { | |
4f4b401b | 147 | rc = jfs_set_acl(tid, inode, ACL_TYPE_DEFAULT, acl); |
1da177e4 LT |
148 | if (rc) |
149 | goto cleanup; | |
150 | } | |
151 | clone = posix_acl_clone(acl, GFP_KERNEL); | |
152 | if (!clone) { | |
153 | rc = -ENOMEM; | |
154 | goto cleanup; | |
155 | } | |
156 | mode = inode->i_mode; | |
157 | rc = posix_acl_create_masq(clone, &mode); | |
158 | if (rc >= 0) { | |
159 | inode->i_mode = mode; | |
160 | if (rc > 0) | |
4f4b401b DK |
161 | rc = jfs_set_acl(tid, inode, ACL_TYPE_ACCESS, |
162 | clone); | |
1da177e4 LT |
163 | } |
164 | posix_acl_release(clone); | |
165 | cleanup: | |
166 | posix_acl_release(acl); | |
167 | } else | |
ce3b0f8d | 168 | inode->i_mode &= ~current_umask(); |
63f83c9f | 169 | |
69eb66d7 DK |
170 | JFS_IP(inode)->mode2 = (JFS_IP(inode)->mode2 & 0xffff0000) | |
171 | inode->i_mode; | |
1da177e4 LT |
172 | |
173 | return rc; | |
174 | } | |
175 | ||
759bfee6 | 176 | int jfs_acl_chmod(struct inode *inode) |
1da177e4 LT |
177 | { |
178 | struct posix_acl *acl, *clone; | |
179 | int rc; | |
180 | ||
181 | if (S_ISLNK(inode->i_mode)) | |
182 | return -EOPNOTSUPP; | |
183 | ||
184 | acl = jfs_get_acl(inode, ACL_TYPE_ACCESS); | |
185 | if (IS_ERR(acl) || !acl) | |
186 | return PTR_ERR(acl); | |
187 | ||
188 | clone = posix_acl_clone(acl, GFP_KERNEL); | |
189 | posix_acl_release(acl); | |
190 | if (!clone) | |
191 | return -ENOMEM; | |
192 | ||
193 | rc = posix_acl_chmod_masq(clone, inode->i_mode); | |
4f4b401b DK |
194 | if (!rc) { |
195 | tid_t tid = txBegin(inode->i_sb, 0); | |
1de87444 | 196 | mutex_lock(&JFS_IP(inode)->commit_mutex); |
4f4b401b DK |
197 | rc = jfs_set_acl(tid, inode, ACL_TYPE_ACCESS, clone); |
198 | if (!rc) | |
199 | rc = txCommit(tid, 1, &inode, 0); | |
200 | txEnd(tid); | |
1de87444 | 201 | mutex_unlock(&JFS_IP(inode)->commit_mutex); |
4f4b401b | 202 | } |
1da177e4 LT |
203 | |
204 | posix_acl_release(clone); | |
205 | return rc; | |
206 | } |