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1/*
2 * Copyright IBM Corporation, 2010
3 * Author Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of version 2.1 of the GNU Lesser General Public License
7 * as published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it would be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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 /* get the default/access acl values and cache them */
70 dacl = __v9fs_get_acl(fid, XATTR_NAME_POSIX_ACL_DEFAULT);
71 pacl = __v9fs_get_acl(fid, XATTR_NAME_POSIX_ACL_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 * 9p Always cache the acl value when
93 * instantiating the inode (v9fs_inode_from_fid)
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 * On access = client and acl = on mode get the acl
109 * values from the server
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 /* Set a setxattr request to server */
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 = XATTR_NAME_POSIX_ACL_ACCESS;
137 break;
138 case ACL_TYPE_DEFAULT:
139 name = XATTR_NAME_POSIX_ACL_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_xattr_get_acl(const struct xattr_handler *handler,
216 struct dentry *dentry, const char *name,
217 void *buffer, size_t size)
218{
219 struct v9fs_session_info *v9ses;
220 struct posix_acl *acl;
221 int error;
222
223 v9ses = v9fs_dentry2v9ses(dentry);
224 /*
225 * We allow set/get/list of acl when access=client is not specified
226 */
227 if ((v9ses->flags & V9FS_ACCESS_MASK) != V9FS_ACCESS_CLIENT)
228 return v9fs_xattr_get(dentry, handler->name, buffer, size);
229
230 acl = v9fs_get_cached_acl(d_inode(dentry), handler->flags);
231 if (IS_ERR(acl))
232 return PTR_ERR(acl);
233 if (acl == NULL)
234 return -ENODATA;
235 error = posix_acl_to_xattr(&init_user_ns, acl, buffer, size);
236 posix_acl_release(acl);
237
238 return error;
239}
240
241static int v9fs_xattr_set_acl(const struct xattr_handler *handler,
242 struct dentry *dentry, const char *name,
243 const void *value, size_t size, int flags)
244{
245 int retval;
246 struct posix_acl *acl;
247 struct v9fs_session_info *v9ses;
248 struct inode *inode = d_inode(dentry);
249
250 v9ses = v9fs_dentry2v9ses(dentry);
251 /*
252 * set the attribute on the remote. Without even looking at the
253 * xattr value. We leave it to the server to validate
254 */
255 if ((v9ses->flags & V9FS_ACCESS_MASK) != V9FS_ACCESS_CLIENT)
256 return v9fs_xattr_set(dentry, handler->name, value, size,
257 flags);
258
259 if (S_ISLNK(inode->i_mode))
260 return -EOPNOTSUPP;
261 if (!inode_owner_or_capable(inode))
262 return -EPERM;
263 if (value) {
264 /* update the cached acl value */
265 acl = posix_acl_from_xattr(&init_user_ns, value, size);
266 if (IS_ERR(acl))
267 return PTR_ERR(acl);
268 else if (acl) {
269 retval = posix_acl_valid(acl);
270 if (retval)
271 goto err_out;
272 }
273 } else
274 acl = NULL;
275
276 switch (handler->flags) {
277 case ACL_TYPE_ACCESS:
278 if (acl) {
279 umode_t mode = inode->i_mode;
280 retval = posix_acl_equiv_mode(acl, &mode);
281 if (retval < 0)
282 goto err_out;
283 else {
284 struct iattr iattr;
285 if (retval == 0) {
286 /*
287 * ACL can be represented
288 * by the mode bits. So don't
289 * update ACL.
290 */
291 acl = NULL;
292 value = NULL;
293 size = 0;
294 }
295 /* Updte the mode bits */
296 iattr.ia_mode = ((mode & S_IALLUGO) |
297 (inode->i_mode & ~S_IALLUGO));
298 iattr.ia_valid = ATTR_MODE;
299 /* FIXME should we update ctime ?
300 * What is the following setxattr update the
301 * mode ?
302 */
303 v9fs_vfs_setattr_dotl(dentry, &iattr);
304 }
305 }
306 break;
307 case ACL_TYPE_DEFAULT:
308 if (!S_ISDIR(inode->i_mode)) {
309 retval = acl ? -EINVAL : 0;
310 goto err_out;
311 }
312 break;
313 default:
314 BUG();
315 }
316 retval = v9fs_xattr_set(dentry, handler->name, value, size, flags);
317 if (!retval)
318 set_cached_acl(inode, handler->flags, acl);
319err_out:
320 posix_acl_release(acl);
321 return retval;
322}
323
324const struct xattr_handler v9fs_xattr_acl_access_handler = {
325 .name = XATTR_NAME_POSIX_ACL_ACCESS,
326 .flags = ACL_TYPE_ACCESS,
327 .get = v9fs_xattr_get_acl,
328 .set = v9fs_xattr_set_acl,
329};
330
331const struct xattr_handler v9fs_xattr_acl_default_handler = {
332 .name = XATTR_NAME_POSIX_ACL_DEFAULT,
333 .flags = ACL_TYPE_DEFAULT,
334 .get = v9fs_xattr_get_acl,
335 .set = v9fs_xattr_set_acl,
336};
1/*
2 * Copyright IBM Corporation, 2010
3 * Author Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of version 2.1 of the GNU Lesser General Public License
7 * as published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it would be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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
27static struct posix_acl *__v9fs_get_acl(struct p9_fid *fid, char *name)
28{
29 ssize_t size;
30 void *value = NULL;
31 struct posix_acl *acl = NULL;
32
33 size = v9fs_fid_xattr_get(fid, name, NULL, 0);
34 if (size > 0) {
35 value = kzalloc(size, GFP_NOFS);
36 if (!value)
37 return ERR_PTR(-ENOMEM);
38 size = v9fs_fid_xattr_get(fid, name, value, size);
39 if (size > 0) {
40 acl = posix_acl_from_xattr(value, size);
41 if (IS_ERR(acl))
42 goto err_out;
43 }
44 } else if (size == -ENODATA || size == 0 ||
45 size == -ENOSYS || size == -EOPNOTSUPP) {
46 acl = NULL;
47 } else
48 acl = ERR_PTR(-EIO);
49
50err_out:
51 kfree(value);
52 return acl;
53}
54
55int v9fs_get_acl(struct inode *inode, struct p9_fid *fid)
56{
57 int retval = 0;
58 struct posix_acl *pacl, *dacl;
59 struct v9fs_session_info *v9ses;
60
61 v9ses = v9fs_inode2v9ses(inode);
62 if (((v9ses->flags & V9FS_ACCESS_MASK) != V9FS_ACCESS_CLIENT) ||
63 ((v9ses->flags & V9FS_ACL_MASK) != V9FS_POSIX_ACL)) {
64 set_cached_acl(inode, ACL_TYPE_DEFAULT, NULL);
65 set_cached_acl(inode, ACL_TYPE_ACCESS, NULL);
66 return 0;
67 }
68 /* get the default/access acl values and cache them */
69 dacl = __v9fs_get_acl(fid, POSIX_ACL_XATTR_DEFAULT);
70 pacl = __v9fs_get_acl(fid, POSIX_ACL_XATTR_ACCESS);
71
72 if (!IS_ERR(dacl) && !IS_ERR(pacl)) {
73 set_cached_acl(inode, ACL_TYPE_DEFAULT, dacl);
74 set_cached_acl(inode, ACL_TYPE_ACCESS, pacl);
75 } else
76 retval = -EIO;
77
78 if (!IS_ERR(dacl))
79 posix_acl_release(dacl);
80
81 if (!IS_ERR(pacl))
82 posix_acl_release(pacl);
83
84 return retval;
85}
86
87static struct posix_acl *v9fs_get_cached_acl(struct inode *inode, int type)
88{
89 struct posix_acl *acl;
90 /*
91 * 9p Always cache the acl value when
92 * instantiating the inode (v9fs_inode_from_fid)
93 */
94 acl = get_cached_acl(inode, type);
95 BUG_ON(acl == ACL_NOT_CACHED);
96 return acl;
97}
98
99struct posix_acl *v9fs_iop_get_acl(struct inode *inode, int type)
100{
101 struct v9fs_session_info *v9ses;
102
103 v9ses = v9fs_inode2v9ses(inode);
104 if (((v9ses->flags & V9FS_ACCESS_MASK) != V9FS_ACCESS_CLIENT) ||
105 ((v9ses->flags & V9FS_ACL_MASK) != V9FS_POSIX_ACL)) {
106 /*
107 * On access = client and acl = on mode get the acl
108 * values from the server
109 */
110 return NULL;
111 }
112 return v9fs_get_cached_acl(inode, type);
113
114}
115
116static int v9fs_set_acl(struct dentry *dentry, int type, struct posix_acl *acl)
117{
118 int retval;
119 char *name;
120 size_t size;
121 void *buffer;
122 struct inode *inode = dentry->d_inode;
123
124 set_cached_acl(inode, type, acl);
125
126 if (!acl)
127 return 0;
128
129 /* Set a setxattr request to server */
130 size = posix_acl_xattr_size(acl->a_count);
131 buffer = kmalloc(size, GFP_KERNEL);
132 if (!buffer)
133 return -ENOMEM;
134 retval = posix_acl_to_xattr(acl, buffer, size);
135 if (retval < 0)
136 goto err_free_out;
137 switch (type) {
138 case ACL_TYPE_ACCESS:
139 name = POSIX_ACL_XATTR_ACCESS;
140 break;
141 case ACL_TYPE_DEFAULT:
142 name = POSIX_ACL_XATTR_DEFAULT;
143 break;
144 default:
145 BUG();
146 }
147 retval = v9fs_xattr_set(dentry, name, buffer, size, 0);
148err_free_out:
149 kfree(buffer);
150 return retval;
151}
152
153int v9fs_acl_chmod(struct dentry *dentry)
154{
155 int retval = 0;
156 struct posix_acl *acl;
157 struct inode *inode = dentry->d_inode;
158
159 if (S_ISLNK(inode->i_mode))
160 return -EOPNOTSUPP;
161 acl = v9fs_get_cached_acl(inode, ACL_TYPE_ACCESS);
162 if (acl) {
163 retval = posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
164 if (retval)
165 return retval;
166 retval = v9fs_set_acl(dentry, ACL_TYPE_ACCESS, acl);
167 posix_acl_release(acl);
168 }
169 return retval;
170}
171
172int v9fs_set_create_acl(struct dentry *dentry,
173 struct posix_acl **dpacl, struct posix_acl **pacl)
174{
175 if (dentry) {
176 v9fs_set_acl(dentry, ACL_TYPE_DEFAULT, *dpacl);
177 v9fs_set_acl(dentry, ACL_TYPE_ACCESS, *pacl);
178 }
179 posix_acl_release(*dpacl);
180 posix_acl_release(*pacl);
181 *dpacl = *pacl = NULL;
182 return 0;
183}
184
185int v9fs_acl_mode(struct inode *dir, umode_t *modep,
186 struct posix_acl **dpacl, struct posix_acl **pacl)
187{
188 int retval = 0;
189 umode_t mode = *modep;
190 struct posix_acl *acl = NULL;
191
192 if (!S_ISLNK(mode)) {
193 acl = v9fs_get_cached_acl(dir, ACL_TYPE_DEFAULT);
194 if (IS_ERR(acl))
195 return PTR_ERR(acl);
196 if (!acl)
197 mode &= ~current_umask();
198 }
199 if (acl) {
200 if (S_ISDIR(mode))
201 *dpacl = posix_acl_dup(acl);
202 retval = posix_acl_create(&acl, GFP_NOFS, &mode);
203 if (retval < 0)
204 return retval;
205 if (retval > 0)
206 *pacl = acl;
207 else
208 posix_acl_release(acl);
209 }
210 *modep = mode;
211 return 0;
212}
213
214static int v9fs_remote_get_acl(struct dentry *dentry, const char *name,
215 void *buffer, size_t size, int type)
216{
217 char *full_name;
218
219 switch (type) {
220 case ACL_TYPE_ACCESS:
221 full_name = POSIX_ACL_XATTR_ACCESS;
222 break;
223 case ACL_TYPE_DEFAULT:
224 full_name = POSIX_ACL_XATTR_DEFAULT;
225 break;
226 default:
227 BUG();
228 }
229 return v9fs_xattr_get(dentry, full_name, buffer, size);
230}
231
232static int v9fs_xattr_get_acl(struct dentry *dentry, const char *name,
233 void *buffer, size_t size, int type)
234{
235 struct v9fs_session_info *v9ses;
236 struct posix_acl *acl;
237 int error;
238
239 if (strcmp(name, "") != 0)
240 return -EINVAL;
241
242 v9ses = v9fs_dentry2v9ses(dentry);
243 /*
244 * We allow set/get/list of acl when access=client is not specified
245 */
246 if ((v9ses->flags & V9FS_ACCESS_MASK) != V9FS_ACCESS_CLIENT)
247 return v9fs_remote_get_acl(dentry, name, buffer, size, type);
248
249 acl = v9fs_get_cached_acl(dentry->d_inode, type);
250 if (IS_ERR(acl))
251 return PTR_ERR(acl);
252 if (acl == NULL)
253 return -ENODATA;
254 error = posix_acl_to_xattr(acl, buffer, size);
255 posix_acl_release(acl);
256
257 return error;
258}
259
260static int v9fs_remote_set_acl(struct dentry *dentry, const char *name,
261 const void *value, size_t size,
262 int flags, int type)
263{
264 char *full_name;
265
266 switch (type) {
267 case ACL_TYPE_ACCESS:
268 full_name = POSIX_ACL_XATTR_ACCESS;
269 break;
270 case ACL_TYPE_DEFAULT:
271 full_name = POSIX_ACL_XATTR_DEFAULT;
272 break;
273 default:
274 BUG();
275 }
276 return v9fs_xattr_set(dentry, full_name, value, size, flags);
277}
278
279
280static int v9fs_xattr_set_acl(struct dentry *dentry, const char *name,
281 const void *value, size_t size,
282 int flags, int type)
283{
284 int retval;
285 struct posix_acl *acl;
286 struct v9fs_session_info *v9ses;
287 struct inode *inode = dentry->d_inode;
288
289 if (strcmp(name, "") != 0)
290 return -EINVAL;
291
292 v9ses = v9fs_dentry2v9ses(dentry);
293 /*
294 * set the attribute on the remote. Without even looking at the
295 * xattr value. We leave it to the server to validate
296 */
297 if ((v9ses->flags & V9FS_ACCESS_MASK) != V9FS_ACCESS_CLIENT)
298 return v9fs_remote_set_acl(dentry, name,
299 value, size, flags, type);
300
301 if (S_ISLNK(inode->i_mode))
302 return -EOPNOTSUPP;
303 if (!inode_owner_or_capable(inode))
304 return -EPERM;
305 if (value) {
306 /* update the cached acl value */
307 acl = posix_acl_from_xattr(value, size);
308 if (IS_ERR(acl))
309 return PTR_ERR(acl);
310 else if (acl) {
311 retval = posix_acl_valid(acl);
312 if (retval)
313 goto err_out;
314 }
315 } else
316 acl = NULL;
317
318 switch (type) {
319 case ACL_TYPE_ACCESS:
320 name = POSIX_ACL_XATTR_ACCESS;
321 if (acl) {
322 umode_t mode = inode->i_mode;
323 retval = posix_acl_equiv_mode(acl, &mode);
324 if (retval < 0)
325 goto err_out;
326 else {
327 struct iattr iattr;
328 if (retval == 0) {
329 /*
330 * ACL can be represented
331 * by the mode bits. So don't
332 * update ACL.
333 */
334 acl = NULL;
335 value = NULL;
336 size = 0;
337 }
338 /* Updte the mode bits */
339 iattr.ia_mode = ((mode & S_IALLUGO) |
340 (inode->i_mode & ~S_IALLUGO));
341 iattr.ia_valid = ATTR_MODE;
342 /* FIXME should we update ctime ?
343 * What is the following setxattr update the
344 * mode ?
345 */
346 v9fs_vfs_setattr_dotl(dentry, &iattr);
347 }
348 }
349 break;
350 case ACL_TYPE_DEFAULT:
351 name = POSIX_ACL_XATTR_DEFAULT;
352 if (!S_ISDIR(inode->i_mode)) {
353 retval = acl ? -EINVAL : 0;
354 goto err_out;
355 }
356 break;
357 default:
358 BUG();
359 }
360 retval = v9fs_xattr_set(dentry, name, value, size, flags);
361 if (!retval)
362 set_cached_acl(inode, type, acl);
363err_out:
364 posix_acl_release(acl);
365 return retval;
366}
367
368const struct xattr_handler v9fs_xattr_acl_access_handler = {
369 .prefix = POSIX_ACL_XATTR_ACCESS,
370 .flags = ACL_TYPE_ACCESS,
371 .get = v9fs_xattr_get_acl,
372 .set = v9fs_xattr_set_acl,
373};
374
375const struct xattr_handler v9fs_xattr_acl_default_handler = {
376 .prefix = POSIX_ACL_XATTR_DEFAULT,
377 .flags = ACL_TYPE_DEFAULT,
378 .get = v9fs_xattr_get_acl,
379 .set = v9fs_xattr_set_acl,
380};