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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 | |
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> | |
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; | |
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: | |
9a59f452 | 41 | ea_name = POSIX_ACL_XATTR_ACCESS; |
1da177e4 LT |
42 | p_acl = &ji->i_acl; |
43 | break; | |
44 | case ACL_TYPE_DEFAULT: | |
9a59f452 | 45 | ea_name = POSIX_ACL_XATTR_DEFAULT; |
1da177e4 LT |
46 | 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 | } | |
259692bd | 75 | kfree(value); |
1da177e4 LT |
76 | return acl; |
77 | } | |
78 | ||
4f4b401b DK |
79 | static int jfs_set_acl(tid_t tid, struct inode *inode, int type, |
80 | struct posix_acl *acl) | |
1da177e4 LT |
81 | { |
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: | |
9a59f452 | 94 | ea_name = POSIX_ACL_XATTR_ACCESS; |
1da177e4 LT |
95 | p_acl = &ji->i_acl; |
96 | break; | |
97 | case ACL_TYPE_DEFAULT: | |
9a59f452 | 98 | ea_name = POSIX_ACL_XATTR_DEFAULT; |
1da177e4 LT |
99 | 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) { | |
9a59f452 | 107 | size = posix_acl_xattr_size(acl->a_count); |
1da177e4 LT |
108 | 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 | } | |
4f4b401b | 115 | rc = __jfs_setxattr(tid, inode, ea_name, value, size, 0); |
1da177e4 | 116 | out: |
259692bd | 117 | kfree(value); |
1da177e4 LT |
118 | |
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 | ||
127 | static 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 | ||
143 | int jfs_permission(struct inode *inode, int mask, struct nameidata *nd) | |
144 | { | |
145 | return generic_permission(inode, mask, jfs_check_acl); | |
146 | } | |
147 | ||
4f4b401b | 148 | int jfs_init_acl(tid_t tid, struct inode *inode, struct inode *dir) |
1da177e4 LT |
149 | { |
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)) { | |
4f4b401b | 164 | rc = jfs_set_acl(tid, inode, ACL_TYPE_DEFAULT, acl); |
1da177e4 LT |
165 | 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) | |
4f4b401b DK |
178 | rc = jfs_set_acl(tid, inode, ACL_TYPE_ACCESS, |
179 | clone); | |
1da177e4 LT |
180 | } |
181 | posix_acl_release(clone); | |
182 | cleanup: | |
183 | posix_acl_release(acl); | |
184 | } else | |
185 | inode->i_mode &= ~current->fs->umask; | |
69eb66d7 DK |
186 | |
187 | JFS_IP(inode)->mode2 = (JFS_IP(inode)->mode2 & 0xffff0000) | | |
188 | inode->i_mode; | |
1da177e4 LT |
189 | |
190 | return rc; | |
191 | } | |
192 | ||
193 | static int jfs_acl_chmod(struct inode *inode) | |
194 | { | |
195 | struct posix_acl *acl, *clone; | |
196 | int rc; | |
197 | ||
198 | if (S_ISLNK(inode->i_mode)) | |
199 | return -EOPNOTSUPP; | |
200 | ||
201 | acl = jfs_get_acl(inode, ACL_TYPE_ACCESS); | |
202 | if (IS_ERR(acl) || !acl) | |
203 | return PTR_ERR(acl); | |
204 | ||
205 | clone = posix_acl_clone(acl, GFP_KERNEL); | |
206 | posix_acl_release(acl); | |
207 | if (!clone) | |
208 | return -ENOMEM; | |
209 | ||
210 | rc = posix_acl_chmod_masq(clone, inode->i_mode); | |
4f4b401b DK |
211 | if (!rc) { |
212 | tid_t tid = txBegin(inode->i_sb, 0); | |
1de87444 | 213 | mutex_lock(&JFS_IP(inode)->commit_mutex); |
4f4b401b DK |
214 | rc = jfs_set_acl(tid, inode, ACL_TYPE_ACCESS, clone); |
215 | if (!rc) | |
216 | rc = txCommit(tid, 1, &inode, 0); | |
217 | txEnd(tid); | |
1de87444 | 218 | mutex_unlock(&JFS_IP(inode)->commit_mutex); |
4f4b401b | 219 | } |
1da177e4 LT |
220 | |
221 | posix_acl_release(clone); | |
222 | return rc; | |
223 | } | |
224 | ||
225 | int jfs_setattr(struct dentry *dentry, struct iattr *iattr) | |
226 | { | |
227 | struct inode *inode = dentry->d_inode; | |
228 | int rc; | |
229 | ||
230 | rc = inode_change_ok(inode, iattr); | |
231 | if (rc) | |
232 | return rc; | |
233 | ||
234 | if ((iattr->ia_valid & ATTR_UID && iattr->ia_uid != inode->i_uid) || | |
235 | (iattr->ia_valid & ATTR_GID && iattr->ia_gid != inode->i_gid)) { | |
236 | if (DQUOT_TRANSFER(inode, iattr)) | |
237 | return -EDQUOT; | |
238 | } | |
239 | ||
240 | rc = inode_setattr(inode, iattr); | |
241 | ||
242 | if (!rc && (iattr->ia_valid & ATTR_MODE)) | |
243 | rc = jfs_acl_chmod(inode); | |
244 | ||
245 | return rc; | |
246 | } |