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21#include <linux/sched.h>
22#include <linux/fs.h>
23#include <linux/quotaops.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
30static 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 acl = get_cached_acl(inode, type);
38 if (acl != ACL_NOT_CACHED)
39 return acl;
40
41 switch(type) {
42 case ACL_TYPE_ACCESS:
43 ea_name = POSIX_ACL_XATTR_ACCESS;
44 break;
45 case ACL_TYPE_DEFAULT:
46 ea_name = POSIX_ACL_XATTR_DEFAULT;
47 break;
48 default:
49 return ERR_PTR(-EINVAL);
50 }
51
52 size = __jfs_getxattr(inode, ea_name, NULL, 0);
53
54 if (size > 0) {
55 value = kmalloc(size, GFP_KERNEL);
56 if (!value)
57 return ERR_PTR(-ENOMEM);
58 size = __jfs_getxattr(inode, ea_name, value, size);
59 }
60
61 if (size < 0) {
62 if (size == -ENODATA)
63 acl = NULL;
64 else
65 acl = ERR_PTR(size);
66 } else {
67 acl = posix_acl_from_xattr(value, size);
68 }
69 kfree(value);
70 if (!IS_ERR(acl))
71 set_cached_acl(inode, type, acl);
72 return acl;
73}
74
75static int jfs_set_acl(tid_t tid, struct inode *inode, int type,
76 struct posix_acl *acl)
77{
78 char *ea_name;
79 int rc;
80 int size = 0;
81 char *value = NULL;
82
83 if (S_ISLNK(inode->i_mode))
84 return -EOPNOTSUPP;
85
86 switch(type) {
87 case ACL_TYPE_ACCESS:
88 ea_name = POSIX_ACL_XATTR_ACCESS;
89 break;
90 case ACL_TYPE_DEFAULT:
91 ea_name = POSIX_ACL_XATTR_DEFAULT;
92 if (!S_ISDIR(inode->i_mode))
93 return acl ? -EACCES : 0;
94 break;
95 default:
96 return -EINVAL;
97 }
98 if (acl) {
99 size = posix_acl_xattr_size(acl->a_count);
100 value = kmalloc(size, GFP_KERNEL);
101 if (!value)
102 return -ENOMEM;
103 rc = posix_acl_to_xattr(acl, value, size);
104 if (rc < 0)
105 goto out;
106 }
107 rc = __jfs_setxattr(tid, inode, ea_name, value, size, 0);
108out:
109 kfree(value);
110
111 if (!rc)
112 set_cached_acl(inode, type, acl);
113
114 return rc;
115}
116
117int jfs_check_acl(struct inode *inode, int mask)
118{
119 struct posix_acl *acl = jfs_get_acl(inode, ACL_TYPE_ACCESS);
120
121 if (IS_ERR(acl))
122 return PTR_ERR(acl);
123 if (acl) {
124 int error = posix_acl_permission(inode, acl, mask);
125 posix_acl_release(acl);
126 return error;
127 }
128
129 return -EAGAIN;
130}
131
132int jfs_init_acl(tid_t tid, struct inode *inode, struct inode *dir)
133{
134 struct posix_acl *acl = NULL;
135 struct posix_acl *clone;
136 mode_t mode;
137 int rc = 0;
138
139 if (S_ISLNK(inode->i_mode))
140 return 0;
141
142 acl = jfs_get_acl(dir, ACL_TYPE_DEFAULT);
143 if (IS_ERR(acl))
144 return PTR_ERR(acl);
145
146 if (acl) {
147 if (S_ISDIR(inode->i_mode)) {
148 rc = jfs_set_acl(tid, inode, ACL_TYPE_DEFAULT, acl);
149 if (rc)
150 goto cleanup;
151 }
152 clone = posix_acl_clone(acl, GFP_KERNEL);
153 if (!clone) {
154 rc = -ENOMEM;
155 goto cleanup;
156 }
157 mode = inode->i_mode;
158 rc = posix_acl_create_masq(clone, &mode);
159 if (rc >= 0) {
160 inode->i_mode = mode;
161 if (rc > 0)
162 rc = jfs_set_acl(tid, inode, ACL_TYPE_ACCESS,
163 clone);
164 }
165 posix_acl_release(clone);
166cleanup:
167 posix_acl_release(acl);
168 } else
169 inode->i_mode &= ~current_umask();
170
171 JFS_IP(inode)->mode2 = (JFS_IP(inode)->mode2 & 0xffff0000) |
172 inode->i_mode;
173
174 return rc;
175}
176
177static int jfs_acl_chmod(struct inode *inode)
178{
179 struct posix_acl *acl, *clone;
180 int rc;
181
182 if (S_ISLNK(inode->i_mode))
183 return -EOPNOTSUPP;
184
185 acl = jfs_get_acl(inode, ACL_TYPE_ACCESS);
186 if (IS_ERR(acl) || !acl)
187 return PTR_ERR(acl);
188
189 clone = posix_acl_clone(acl, GFP_KERNEL);
190 posix_acl_release(acl);
191 if (!clone)
192 return -ENOMEM;
193
194 rc = posix_acl_chmod_masq(clone, inode->i_mode);
195 if (!rc) {
196 tid_t tid = txBegin(inode->i_sb, 0);
197 mutex_lock(&JFS_IP(inode)->commit_mutex);
198 rc = jfs_set_acl(tid, inode, ACL_TYPE_ACCESS, clone);
199 if (!rc)
200 rc = txCommit(tid, 1, &inode, 0);
201 txEnd(tid);
202 mutex_unlock(&JFS_IP(inode)->commit_mutex);
203 }
204
205 posix_acl_release(clone);
206 return rc;
207}
208
209int jfs_setattr(struct dentry *dentry, struct iattr *iattr)
210{
211 struct inode *inode = dentry->d_inode;
212 int rc;
213
214 rc = inode_change_ok(inode, iattr);
215 if (rc)
216 return rc;
217
218 if ((iattr->ia_valid & ATTR_UID && iattr->ia_uid != inode->i_uid) ||
219 (iattr->ia_valid & ATTR_GID && iattr->ia_gid != inode->i_gid)) {
220 if (vfs_dq_transfer(inode, iattr))
221 return -EDQUOT;
222 }
223
224 rc = inode_setattr(inode, iattr);
225
226 if (!rc && (iattr->ia_valid & ATTR_MODE))
227 rc = jfs_acl_chmod(inode);
228
229 return rc;
230}
231
