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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> | |
24 | #include "jfs_incore.h" | |
25 | #include "jfs_xattr.h" | |
26 | #include "jfs_acl.h" | |
27 | ||
28 | static struct posix_acl *jfs_get_acl(struct inode *inode, int type) | |
29 | { | |
30 | struct posix_acl *acl; | |
31 | char *ea_name; | |
32 | struct jfs_inode_info *ji = JFS_IP(inode); | |
33 | struct posix_acl **p_acl; | |
34 | int size; | |
35 | char *value = NULL; | |
36 | ||
37 | switch(type) { | |
38 | case ACL_TYPE_ACCESS: | |
39 | ea_name = XATTR_NAME_ACL_ACCESS; | |
40 | p_acl = &ji->i_acl; | |
41 | break; | |
42 | case ACL_TYPE_DEFAULT: | |
43 | ea_name = XATTR_NAME_ACL_DEFAULT; | |
44 | p_acl = &ji->i_default_acl; | |
45 | break; | |
46 | default: | |
47 | return ERR_PTR(-EINVAL); | |
48 | } | |
49 | ||
50 | if (*p_acl != JFS_ACL_NOT_CACHED) | |
51 | return posix_acl_dup(*p_acl); | |
52 | ||
53 | size = __jfs_getxattr(inode, ea_name, NULL, 0); | |
54 | ||
55 | if (size > 0) { | |
56 | value = kmalloc(size, GFP_KERNEL); | |
57 | if (!value) | |
58 | return ERR_PTR(-ENOMEM); | |
59 | size = __jfs_getxattr(inode, ea_name, value, size); | |
60 | } | |
61 | ||
62 | if (size < 0) { | |
63 | if (size == -ENODATA) { | |
64 | *p_acl = NULL; | |
65 | acl = NULL; | |
66 | } else | |
67 | acl = ERR_PTR(size); | |
68 | } else { | |
69 | acl = posix_acl_from_xattr(value, size); | |
70 | if (!IS_ERR(acl)) | |
71 | *p_acl = posix_acl_dup(acl); | |
72 | } | |
259692bd | 73 | kfree(value); |
1da177e4 LT |
74 | return acl; |
75 | } | |
76 | ||
77 | static int jfs_set_acl(struct inode *inode, int type, struct posix_acl *acl) | |
78 | { | |
79 | char *ea_name; | |
80 | struct jfs_inode_info *ji = JFS_IP(inode); | |
81 | struct posix_acl **p_acl; | |
82 | int rc; | |
83 | int size = 0; | |
84 | char *value = NULL; | |
85 | ||
86 | if (S_ISLNK(inode->i_mode)) | |
87 | return -EOPNOTSUPP; | |
88 | ||
89 | switch(type) { | |
90 | case ACL_TYPE_ACCESS: | |
91 | ea_name = XATTR_NAME_ACL_ACCESS; | |
92 | p_acl = &ji->i_acl; | |
93 | break; | |
94 | case ACL_TYPE_DEFAULT: | |
95 | ea_name = XATTR_NAME_ACL_DEFAULT; | |
96 | p_acl = &ji->i_default_acl; | |
97 | if (!S_ISDIR(inode->i_mode)) | |
98 | return acl ? -EACCES : 0; | |
99 | break; | |
100 | default: | |
101 | return -EINVAL; | |
102 | } | |
103 | if (acl) { | |
104 | size = xattr_acl_size(acl->a_count); | |
105 | value = kmalloc(size, GFP_KERNEL); | |
106 | if (!value) | |
107 | return -ENOMEM; | |
108 | rc = posix_acl_to_xattr(acl, value, size); | |
109 | if (rc < 0) | |
110 | goto out; | |
111 | } | |
112 | rc = __jfs_setxattr(inode, ea_name, value, size, 0); | |
113 | out: | |
259692bd | 114 | kfree(value); |
1da177e4 LT |
115 | |
116 | if (!rc) { | |
117 | if (*p_acl && (*p_acl != JFS_ACL_NOT_CACHED)) | |
118 | posix_acl_release(*p_acl); | |
119 | *p_acl = posix_acl_dup(acl); | |
120 | } | |
121 | return rc; | |
122 | } | |
123 | ||
124 | static int jfs_check_acl(struct inode *inode, int mask) | |
125 | { | |
126 | struct jfs_inode_info *ji = JFS_IP(inode); | |
127 | ||
128 | if (ji->i_acl == JFS_ACL_NOT_CACHED) { | |
129 | struct posix_acl *acl = jfs_get_acl(inode, ACL_TYPE_ACCESS); | |
130 | if (IS_ERR(acl)) | |
131 | return PTR_ERR(acl); | |
132 | posix_acl_release(acl); | |
133 | } | |
134 | ||
135 | if (ji->i_acl) | |
136 | return posix_acl_permission(inode, ji->i_acl, mask); | |
137 | return -EAGAIN; | |
138 | } | |
139 | ||
140 | int jfs_permission(struct inode *inode, int mask, struct nameidata *nd) | |
141 | { | |
142 | return generic_permission(inode, mask, jfs_check_acl); | |
143 | } | |
144 | ||
145 | int jfs_init_acl(struct inode *inode, struct inode *dir) | |
146 | { | |
147 | struct posix_acl *acl = NULL; | |
148 | struct posix_acl *clone; | |
149 | mode_t mode; | |
150 | int rc = 0; | |
151 | ||
152 | if (S_ISLNK(inode->i_mode)) | |
153 | return 0; | |
154 | ||
155 | acl = jfs_get_acl(dir, ACL_TYPE_DEFAULT); | |
156 | if (IS_ERR(acl)) | |
157 | return PTR_ERR(acl); | |
158 | ||
159 | if (acl) { | |
160 | if (S_ISDIR(inode->i_mode)) { | |
161 | rc = jfs_set_acl(inode, ACL_TYPE_DEFAULT, acl); | |
162 | if (rc) | |
163 | goto cleanup; | |
164 | } | |
165 | clone = posix_acl_clone(acl, GFP_KERNEL); | |
166 | if (!clone) { | |
167 | rc = -ENOMEM; | |
168 | goto cleanup; | |
169 | } | |
170 | mode = inode->i_mode; | |
171 | rc = posix_acl_create_masq(clone, &mode); | |
172 | if (rc >= 0) { | |
173 | inode->i_mode = mode; | |
174 | if (rc > 0) | |
175 | rc = jfs_set_acl(inode, ACL_TYPE_ACCESS, clone); | |
176 | } | |
177 | posix_acl_release(clone); | |
178 | cleanup: | |
179 | posix_acl_release(acl); | |
180 | } else | |
181 | inode->i_mode &= ~current->fs->umask; | |
182 | ||
183 | return rc; | |
184 | } | |
185 | ||
186 | static int jfs_acl_chmod(struct inode *inode) | |
187 | { | |
188 | struct posix_acl *acl, *clone; | |
189 | int rc; | |
190 | ||
191 | if (S_ISLNK(inode->i_mode)) | |
192 | return -EOPNOTSUPP; | |
193 | ||
194 | acl = jfs_get_acl(inode, ACL_TYPE_ACCESS); | |
195 | if (IS_ERR(acl) || !acl) | |
196 | return PTR_ERR(acl); | |
197 | ||
198 | clone = posix_acl_clone(acl, GFP_KERNEL); | |
199 | posix_acl_release(acl); | |
200 | if (!clone) | |
201 | return -ENOMEM; | |
202 | ||
203 | rc = posix_acl_chmod_masq(clone, inode->i_mode); | |
204 | if (!rc) | |
205 | rc = jfs_set_acl(inode, ACL_TYPE_ACCESS, clone); | |
206 | ||
207 | posix_acl_release(clone); | |
208 | return rc; | |
209 | } | |
210 | ||
211 | int jfs_setattr(struct dentry *dentry, struct iattr *iattr) | |
212 | { | |
213 | struct inode *inode = dentry->d_inode; | |
214 | int rc; | |
215 | ||
216 | rc = inode_change_ok(inode, iattr); | |
217 | if (rc) | |
218 | return rc; | |
219 | ||
220 | if ((iattr->ia_valid & ATTR_UID && iattr->ia_uid != inode->i_uid) || | |
221 | (iattr->ia_valid & ATTR_GID && iattr->ia_gid != inode->i_gid)) { | |
222 | if (DQUOT_TRANSFER(inode, iattr)) | |
223 | return -EDQUOT; | |
224 | } | |
225 | ||
226 | rc = inode_setattr(inode, iattr); | |
227 | ||
228 | if (!rc && (iattr->ia_valid & ATTR_MODE)) | |
229 | rc = jfs_acl_chmod(inode); | |
230 | ||
231 | return rc; | |
232 | } |