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> | |
23 | #include <linux/quotaops.h> | |
9a59f452 | 24 | #include <linux/posix_acl_xattr.h> |
1da177e4 | 25 | #include "jfs_incore.h" |
4f4b401b | 26 | #include "jfs_txnmgr.h" |
1da177e4 LT |
27 | #include "jfs_xattr.h" |
28 | #include "jfs_acl.h" | |
29 | ||
30 | static struct posix_acl *jfs_get_acl(struct inode *inode, int type) | |
31 | { | |
32 | struct posix_acl *acl; | |
33 | char *ea_name; | |
1da177e4 LT |
34 | struct posix_acl **p_acl; |
35 | int size; | |
36 | char *value = NULL; | |
37 | ||
38 | switch(type) { | |
39 | case ACL_TYPE_ACCESS: | |
9a59f452 | 40 | ea_name = POSIX_ACL_XATTR_ACCESS; |
05fc0790 | 41 | p_acl = &inode->i_acl; |
1da177e4 LT |
42 | break; |
43 | case ACL_TYPE_DEFAULT: | |
9a59f452 | 44 | ea_name = POSIX_ACL_XATTR_DEFAULT; |
05fc0790 | 45 | p_acl = &inode->i_default_acl; |
1da177e4 LT |
46 | break; |
47 | default: | |
48 | return ERR_PTR(-EINVAL); | |
49 | } | |
50 | ||
05fc0790 | 51 | if (*p_acl != ACL_NOT_CACHED) |
1da177e4 LT |
52 | return posix_acl_dup(*p_acl); |
53 | ||
54 | size = __jfs_getxattr(inode, ea_name, NULL, 0); | |
55 | ||
56 | if (size > 0) { | |
57 | value = kmalloc(size, GFP_KERNEL); | |
58 | if (!value) | |
59 | return ERR_PTR(-ENOMEM); | |
60 | size = __jfs_getxattr(inode, ea_name, value, size); | |
61 | } | |
62 | ||
63 | if (size < 0) { | |
64 | if (size == -ENODATA) { | |
65 | *p_acl = NULL; | |
66 | acl = NULL; | |
67 | } else | |
68 | acl = ERR_PTR(size); | |
69 | } else { | |
70 | acl = posix_acl_from_xattr(value, size); | |
71 | if (!IS_ERR(acl)) | |
72 | *p_acl = posix_acl_dup(acl); | |
73 | } | |
259692bd | 74 | kfree(value); |
1da177e4 LT |
75 | return acl; |
76 | } | |
77 | ||
4f4b401b DK |
78 | static int jfs_set_acl(tid_t tid, struct inode *inode, int type, |
79 | struct posix_acl *acl) | |
1da177e4 LT |
80 | { |
81 | char *ea_name; | |
1da177e4 LT |
82 | struct posix_acl **p_acl; |
83 | int rc; | |
84 | int size = 0; | |
85 | char *value = NULL; | |
86 | ||
87 | if (S_ISLNK(inode->i_mode)) | |
88 | return -EOPNOTSUPP; | |
89 | ||
90 | switch(type) { | |
91 | case ACL_TYPE_ACCESS: | |
9a59f452 | 92 | ea_name = POSIX_ACL_XATTR_ACCESS; |
05fc0790 | 93 | p_acl = &inode->i_acl; |
1da177e4 LT |
94 | break; |
95 | case ACL_TYPE_DEFAULT: | |
9a59f452 | 96 | ea_name = POSIX_ACL_XATTR_DEFAULT; |
05fc0790 | 97 | p_acl = &inode->i_default_acl; |
1da177e4 LT |
98 | if (!S_ISDIR(inode->i_mode)) |
99 | return acl ? -EACCES : 0; | |
100 | break; | |
101 | default: | |
102 | return -EINVAL; | |
103 | } | |
104 | if (acl) { | |
9a59f452 | 105 | size = posix_acl_xattr_size(acl->a_count); |
1da177e4 LT |
106 | value = kmalloc(size, GFP_KERNEL); |
107 | if (!value) | |
108 | return -ENOMEM; | |
109 | rc = posix_acl_to_xattr(acl, value, size); | |
110 | if (rc < 0) | |
111 | goto out; | |
112 | } | |
4f4b401b | 113 | rc = __jfs_setxattr(tid, inode, ea_name, value, size, 0); |
1da177e4 | 114 | out: |
259692bd | 115 | kfree(value); |
1da177e4 LT |
116 | |
117 | if (!rc) { | |
05fc0790 | 118 | if (*p_acl && (*p_acl != ACL_NOT_CACHED)) |
1da177e4 LT |
119 | posix_acl_release(*p_acl); |
120 | *p_acl = posix_acl_dup(acl); | |
121 | } | |
122 | return rc; | |
123 | } | |
124 | ||
125 | static int jfs_check_acl(struct inode *inode, int mask) | |
126 | { | |
05fc0790 | 127 | if (inode->i_acl == ACL_NOT_CACHED) { |
1da177e4 LT |
128 | struct posix_acl *acl = jfs_get_acl(inode, ACL_TYPE_ACCESS); |
129 | if (IS_ERR(acl)) | |
130 | return PTR_ERR(acl); | |
131 | posix_acl_release(acl); | |
132 | } | |
133 | ||
05fc0790 AV |
134 | if (inode->i_acl) |
135 | return posix_acl_permission(inode, inode->i_acl, mask); | |
1da177e4 LT |
136 | return -EAGAIN; |
137 | } | |
138 | ||
e6305c43 | 139 | int jfs_permission(struct inode *inode, int mask) |
1da177e4 LT |
140 | { |
141 | return generic_permission(inode, mask, jfs_check_acl); | |
142 | } | |
143 | ||
4f4b401b | 144 | int jfs_init_acl(tid_t tid, struct inode *inode, struct inode *dir) |
1da177e4 LT |
145 | { |
146 | struct posix_acl *acl = NULL; | |
147 | struct posix_acl *clone; | |
148 | mode_t mode; | |
149 | int rc = 0; | |
150 | ||
151 | if (S_ISLNK(inode->i_mode)) | |
152 | return 0; | |
153 | ||
154 | acl = jfs_get_acl(dir, ACL_TYPE_DEFAULT); | |
155 | if (IS_ERR(acl)) | |
156 | return PTR_ERR(acl); | |
157 | ||
158 | if (acl) { | |
159 | if (S_ISDIR(inode->i_mode)) { | |
4f4b401b | 160 | rc = jfs_set_acl(tid, inode, ACL_TYPE_DEFAULT, acl); |
1da177e4 LT |
161 | if (rc) |
162 | goto cleanup; | |
163 | } | |
164 | clone = posix_acl_clone(acl, GFP_KERNEL); | |
165 | if (!clone) { | |
166 | rc = -ENOMEM; | |
167 | goto cleanup; | |
168 | } | |
169 | mode = inode->i_mode; | |
170 | rc = posix_acl_create_masq(clone, &mode); | |
171 | if (rc >= 0) { | |
172 | inode->i_mode = mode; | |
173 | if (rc > 0) | |
4f4b401b DK |
174 | rc = jfs_set_acl(tid, inode, ACL_TYPE_ACCESS, |
175 | clone); | |
1da177e4 LT |
176 | } |
177 | posix_acl_release(clone); | |
178 | cleanup: | |
179 | posix_acl_release(acl); | |
180 | } else | |
ce3b0f8d | 181 | inode->i_mode &= ~current_umask(); |
63f83c9f | 182 | |
69eb66d7 DK |
183 | JFS_IP(inode)->mode2 = (JFS_IP(inode)->mode2 & 0xffff0000) | |
184 | inode->i_mode; | |
1da177e4 LT |
185 | |
186 | return rc; | |
187 | } | |
188 | ||
189 | static int jfs_acl_chmod(struct inode *inode) | |
190 | { | |
191 | struct posix_acl *acl, *clone; | |
192 | int rc; | |
193 | ||
194 | if (S_ISLNK(inode->i_mode)) | |
195 | return -EOPNOTSUPP; | |
196 | ||
197 | acl = jfs_get_acl(inode, ACL_TYPE_ACCESS); | |
198 | if (IS_ERR(acl) || !acl) | |
199 | return PTR_ERR(acl); | |
200 | ||
201 | clone = posix_acl_clone(acl, GFP_KERNEL); | |
202 | posix_acl_release(acl); | |
203 | if (!clone) | |
204 | return -ENOMEM; | |
205 | ||
206 | rc = posix_acl_chmod_masq(clone, inode->i_mode); | |
4f4b401b DK |
207 | if (!rc) { |
208 | tid_t tid = txBegin(inode->i_sb, 0); | |
1de87444 | 209 | mutex_lock(&JFS_IP(inode)->commit_mutex); |
4f4b401b DK |
210 | rc = jfs_set_acl(tid, inode, ACL_TYPE_ACCESS, clone); |
211 | if (!rc) | |
212 | rc = txCommit(tid, 1, &inode, 0); | |
213 | txEnd(tid); | |
1de87444 | 214 | mutex_unlock(&JFS_IP(inode)->commit_mutex); |
4f4b401b | 215 | } |
1da177e4 LT |
216 | |
217 | posix_acl_release(clone); | |
218 | return rc; | |
219 | } | |
220 | ||
221 | int jfs_setattr(struct dentry *dentry, struct iattr *iattr) | |
222 | { | |
223 | struct inode *inode = dentry->d_inode; | |
224 | int rc; | |
225 | ||
226 | rc = inode_change_ok(inode, iattr); | |
227 | if (rc) | |
228 | return rc; | |
229 | ||
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)) { | |
c94d2a22 | 232 | if (vfs_dq_transfer(inode, iattr)) |
1da177e4 LT |
233 | return -EDQUOT; |
234 | } | |
235 | ||
236 | rc = inode_setattr(inode, iattr); | |
237 | ||
238 | if (!rc && (iattr->ia_valid & ATTR_MODE)) | |
239 | rc = jfs_acl_chmod(inode); | |
240 | ||
241 | return rc; | |
242 | } |