1
2
3
4
5
6
7
8
9
10
11
12
13
14
15#include <linux/module.h>
16#include <linux/fs.h>
17#include <net/9p/9p.h>
18#include <net/9p/client.h>
19#include <linux/slab.h>
20#include <linux/sched.h>
21#include <linux/posix_acl_xattr.h>
22#include "xattr.h"
23#include "acl.h"
24#include "v9fs.h"
25#include "v9fs_vfs.h"
26#include "fid.h"
27
28static struct posix_acl *__v9fs_get_acl(struct p9_fid *fid, char *name)
29{
30 ssize_t size;
31 void *value = NULL;
32 struct posix_acl *acl = NULL;
33
34 size = v9fs_fid_xattr_get(fid, name, NULL, 0);
35 if (size > 0) {
36 value = kzalloc(size, GFP_NOFS);
37 if (!value)
38 return ERR_PTR(-ENOMEM);
39 size = v9fs_fid_xattr_get(fid, name, value, size);
40 if (size > 0) {
41 acl = posix_acl_from_xattr(&init_user_ns, value, size);
42 if (IS_ERR(acl))
43 goto err_out;
44 }
45 } else if (size == -ENODATA || size == 0 ||
46 size == -ENOSYS || size == -EOPNOTSUPP) {
47 acl = NULL;
48 } else
49 acl = ERR_PTR(-EIO);
50
51err_out:
52 kfree(value);
53 return acl;
54}
55
56int v9fs_get_acl(struct inode *inode, struct p9_fid *fid)
57{
58 int retval = 0;
59 struct posix_acl *pacl, *dacl;
60 struct v9fs_session_info *v9ses;
61
62 v9ses = v9fs_inode2v9ses(inode);
63 if (((v9ses->flags & V9FS_ACCESS_MASK) != V9FS_ACCESS_CLIENT) ||
64 ((v9ses->flags & V9FS_ACL_MASK) != V9FS_POSIX_ACL)) {
65 set_cached_acl(inode, ACL_TYPE_DEFAULT, NULL);
66 set_cached_acl(inode, ACL_TYPE_ACCESS, NULL);
67 return 0;
68 }
69
70 dacl = __v9fs_get_acl(fid, POSIX_ACL_XATTR_DEFAULT);
71 pacl = __v9fs_get_acl(fid, POSIX_ACL_XATTR_ACCESS);
72
73 if (!IS_ERR(dacl) && !IS_ERR(pacl)) {
74 set_cached_acl(inode, ACL_TYPE_DEFAULT, dacl);
75 set_cached_acl(inode, ACL_TYPE_ACCESS, pacl);
76 } else
77 retval = -EIO;
78
79 if (!IS_ERR(dacl))
80 posix_acl_release(dacl);
81
82 if (!IS_ERR(pacl))
83 posix_acl_release(pacl);
84
85 return retval;
86}
87
88static struct posix_acl *v9fs_get_cached_acl(struct inode *inode, int type)
89{
90 struct posix_acl *acl;
91
92
93
94
95 acl = get_cached_acl(inode, type);
96 BUG_ON(acl == ACL_NOT_CACHED);
97 return acl;
98}
99
100struct posix_acl *v9fs_iop_get_acl(struct inode *inode, int type)
101{
102 struct v9fs_session_info *v9ses;
103
104 v9ses = v9fs_inode2v9ses(inode);
105 if (((v9ses->flags & V9FS_ACCESS_MASK) != V9FS_ACCESS_CLIENT) ||
106 ((v9ses->flags & V9FS_ACL_MASK) != V9FS_POSIX_ACL)) {
107
108
109
110
111 return NULL;
112 }
113 return v9fs_get_cached_acl(inode, type);
114
115}
116
117static int v9fs_set_acl(struct p9_fid *fid, int type, struct posix_acl *acl)
118{
119 int retval;
120 char *name;
121 size_t size;
122 void *buffer;
123 if (!acl)
124 return 0;
125
126
127 size = posix_acl_xattr_size(acl->a_count);
128 buffer = kmalloc(size, GFP_KERNEL);
129 if (!buffer)
130 return -ENOMEM;
131 retval = posix_acl_to_xattr(&init_user_ns, acl, buffer, size);
132 if (retval < 0)
133 goto err_free_out;
134 switch (type) {
135 case ACL_TYPE_ACCESS:
136 name = POSIX_ACL_XATTR_ACCESS;
137 break;
138 case ACL_TYPE_DEFAULT:
139 name = POSIX_ACL_XATTR_DEFAULT;
140 break;
141 default:
142 BUG();
143 }
144 retval = v9fs_fid_xattr_set(fid, name, buffer, size, 0);
145err_free_out:
146 kfree(buffer);
147 return retval;
148}
149
150int v9fs_acl_chmod(struct inode *inode, struct p9_fid *fid)
151{
152 int retval = 0;
153 struct posix_acl *acl;
154
155 if (S_ISLNK(inode->i_mode))
156 return -EOPNOTSUPP;
157 acl = v9fs_get_cached_acl(inode, ACL_TYPE_ACCESS);
158 if (acl) {
159 retval = __posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
160 if (retval)
161 return retval;
162 set_cached_acl(inode, ACL_TYPE_ACCESS, acl);
163 retval = v9fs_set_acl(fid, ACL_TYPE_ACCESS, acl);
164 posix_acl_release(acl);
165 }
166 return retval;
167}
168
169int v9fs_set_create_acl(struct inode *inode, struct p9_fid *fid,
170 struct posix_acl *dacl, struct posix_acl *acl)
171{
172 set_cached_acl(inode, ACL_TYPE_DEFAULT, dacl);
173 set_cached_acl(inode, ACL_TYPE_ACCESS, acl);
174 v9fs_set_acl(fid, ACL_TYPE_DEFAULT, dacl);
175 v9fs_set_acl(fid, ACL_TYPE_ACCESS, acl);
176 return 0;
177}
178
179void v9fs_put_acl(struct posix_acl *dacl,
180 struct posix_acl *acl)
181{
182 posix_acl_release(dacl);
183 posix_acl_release(acl);
184}
185
186int v9fs_acl_mode(struct inode *dir, umode_t *modep,
187 struct posix_acl **dpacl, struct posix_acl **pacl)
188{
189 int retval = 0;
190 umode_t mode = *modep;
191 struct posix_acl *acl = NULL;
192
193 if (!S_ISLNK(mode)) {
194 acl = v9fs_get_cached_acl(dir, ACL_TYPE_DEFAULT);
195 if (IS_ERR(acl))
196 return PTR_ERR(acl);
197 if (!acl)
198 mode &= ~current_umask();
199 }
200 if (acl) {
201 if (S_ISDIR(mode))
202 *dpacl = posix_acl_dup(acl);
203 retval = __posix_acl_create(&acl, GFP_NOFS, &mode);
204 if (retval < 0)
205 return retval;
206 if (retval > 0)
207 *pacl = acl;
208 else
209 posix_acl_release(acl);
210 }
211 *modep = mode;
212 return 0;
213}
214
215static int v9fs_remote_get_acl(struct dentry *dentry, const char *name,
216 void *buffer, size_t size, int type)
217{
218 char *full_name;
219
220 switch (type) {
221 case ACL_TYPE_ACCESS:
222 full_name = POSIX_ACL_XATTR_ACCESS;
223 break;
224 case ACL_TYPE_DEFAULT:
225 full_name = POSIX_ACL_XATTR_DEFAULT;
226 break;
227 default:
228 BUG();
229 }
230 return v9fs_xattr_get(dentry, full_name, buffer, size);
231}
232
233static int v9fs_xattr_get_acl(struct dentry *dentry, const char *name,
234 void *buffer, size_t size, int type)
235{
236 struct v9fs_session_info *v9ses;
237 struct posix_acl *acl;
238 int error;
239
240 if (strcmp(name, "") != 0)
241 return -EINVAL;
242
243 v9ses = v9fs_dentry2v9ses(dentry);
244
245
246
247 if ((v9ses->flags & V9FS_ACCESS_MASK) != V9FS_ACCESS_CLIENT)
248 return v9fs_remote_get_acl(dentry, name, buffer, size, type);
249
250 acl = v9fs_get_cached_acl(dentry->d_inode, type);
251 if (IS_ERR(acl))
252 return PTR_ERR(acl);
253 if (acl == NULL)
254 return -ENODATA;
255 error = posix_acl_to_xattr(&init_user_ns, acl, buffer, size);
256 posix_acl_release(acl);
257
258 return error;
259}
260
261static int v9fs_remote_set_acl(struct dentry *dentry, const char *name,
262 const void *value, size_t size,
263 int flags, int type)
264{
265 char *full_name;
266
267 switch (type) {
268 case ACL_TYPE_ACCESS:
269 full_name = POSIX_ACL_XATTR_ACCESS;
270 break;
271 case ACL_TYPE_DEFAULT:
272 full_name = POSIX_ACL_XATTR_DEFAULT;
273 break;
274 default:
275 BUG();
276 }
277 return v9fs_xattr_set(dentry, full_name, value, size, flags);
278}
279
280
281static int v9fs_xattr_set_acl(struct dentry *dentry, const char *name,
282 const void *value, size_t size,
283 int flags, int type)
284{
285 int retval;
286 struct posix_acl *acl;
287 struct v9fs_session_info *v9ses;
288 struct inode *inode = dentry->d_inode;
289
290 if (strcmp(name, "") != 0)
291 return -EINVAL;
292
293 v9ses = v9fs_dentry2v9ses(dentry);
294
295
296
297
298 if ((v9ses->flags & V9FS_ACCESS_MASK) != V9FS_ACCESS_CLIENT)
299 return v9fs_remote_set_acl(dentry, name,
300 value, size, flags, type);
301
302 if (S_ISLNK(inode->i_mode))
303 return -EOPNOTSUPP;
304 if (!inode_owner_or_capable(inode))
305 return -EPERM;
306 if (value) {
307
308 acl = posix_acl_from_xattr(&init_user_ns, value, size);
309 if (IS_ERR(acl))
310 return PTR_ERR(acl);
311 else if (acl) {
312 retval = posix_acl_valid(acl);
313 if (retval)
314 goto err_out;
315 }
316 } else
317 acl = NULL;
318
319 switch (type) {
320 case ACL_TYPE_ACCESS:
321 name = POSIX_ACL_XATTR_ACCESS;
322 if (acl) {
323 umode_t mode = inode->i_mode;
324 retval = posix_acl_equiv_mode(acl, &mode);
325 if (retval < 0)
326 goto err_out;
327 else {
328 struct iattr iattr;
329 if (retval == 0) {
330
331
332
333
334
335 acl = NULL;
336 value = NULL;
337 size = 0;
338 }
339
340 iattr.ia_mode = ((mode & S_IALLUGO) |
341 (inode->i_mode & ~S_IALLUGO));
342 iattr.ia_valid = ATTR_MODE;
343
344
345
346
347 v9fs_vfs_setattr_dotl(dentry, &iattr);
348 }
349 }
350 break;
351 case ACL_TYPE_DEFAULT:
352 name = POSIX_ACL_XATTR_DEFAULT;
353 if (!S_ISDIR(inode->i_mode)) {
354 retval = acl ? -EINVAL : 0;
355 goto err_out;
356 }
357 break;
358 default:
359 BUG();
360 }
361 retval = v9fs_xattr_set(dentry, name, value, size, flags);
362 if (!retval)
363 set_cached_acl(inode, type, acl);
364err_out:
365 posix_acl_release(acl);
366 return retval;
367}
368
369const struct xattr_handler v9fs_xattr_acl_access_handler = {
370 .prefix = POSIX_ACL_XATTR_ACCESS,
371 .flags = ACL_TYPE_ACCESS,
372 .get = v9fs_xattr_get_acl,
373 .set = v9fs_xattr_set_acl,
374};
375
376const struct xattr_handler v9fs_xattr_acl_default_handler = {
377 .prefix = POSIX_ACL_XATTR_DEFAULT,
378 .flags = ACL_TYPE_DEFAULT,
379 .get = v9fs_xattr_get_acl,
380 .set = v9fs_xattr_set_acl,
381};
382
