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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(is_uncached_acl(acl));
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, struct inode *inode,
217 const char *name, 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(inode, 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, struct inode *inode,
243 const char *name, const void *value,
244 size_t size, int flags)
245{
246 int retval;
247 struct posix_acl *acl;
248 struct v9fs_session_info *v9ses;
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(inode->i_sb->s_user_ns, 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 struct iattr iattr;
280 struct posix_acl *old_acl = acl;
281
282 retval = posix_acl_update_mode(inode, &iattr.ia_mode, &acl);
283 if (retval)
284 goto err_out;
285 if (!acl) {
286 /*
287 * ACL can be represented
288 * by the mode bits. So don't
289 * update ACL.
290 */
291 posix_acl_release(old_acl);
292 value = NULL;
293 size = 0;
294 }
295 iattr.ia_valid = ATTR_MODE;
296 /* FIXME should we update ctime ?
297 * What is the following setxattr update the
298 * mode ?
299 */
300 v9fs_vfs_setattr_dotl(dentry, &iattr);
301 }
302 break;
303 case ACL_TYPE_DEFAULT:
304 if (!S_ISDIR(inode->i_mode)) {
305 retval = acl ? -EINVAL : 0;
306 goto err_out;
307 }
308 break;
309 default:
310 BUG();
311 }
312 retval = v9fs_xattr_set(dentry, handler->name, value, size, flags);
313 if (!retval)
314 set_cached_acl(inode, handler->flags, acl);
315err_out:
316 posix_acl_release(acl);
317 return retval;
318}
319
320const struct xattr_handler v9fs_xattr_acl_access_handler = {
321 .name = XATTR_NAME_POSIX_ACL_ACCESS,
322 .flags = ACL_TYPE_ACCESS,
323 .get = v9fs_xattr_get_acl,
324 .set = v9fs_xattr_set_acl,
325};
326
327const struct xattr_handler v9fs_xattr_acl_default_handler = {
328 .name = XATTR_NAME_POSIX_ACL_DEFAULT,
329 .flags = ACL_TYPE_DEFAULT,
330 .get = v9fs_xattr_get_acl,
331 .set = v9fs_xattr_set_acl,
332};
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(is_uncached_acl(acl));
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, struct inode *inode,
217 const char *name, 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(inode, 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, struct inode *inode,
243 const char *name, const void *value,
244 size_t size, int flags)
245{
246 int retval;
247 struct posix_acl *acl;
248 struct v9fs_session_info *v9ses;
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(inode->i_sb->s_user_ns, 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 struct iattr iattr = { 0 };
280 struct posix_acl *old_acl = acl;
281
282 retval = posix_acl_update_mode(inode, &iattr.ia_mode, &acl);
283 if (retval)
284 goto err_out;
285 if (!acl) {
286 /*
287 * ACL can be represented
288 * by the mode bits. So don't
289 * update ACL.
290 */
291 posix_acl_release(old_acl);
292 value = NULL;
293 size = 0;
294 }
295 iattr.ia_valid = ATTR_MODE;
296 /* FIXME should we update ctime ?
297 * What is the following setxattr update the
298 * mode ?
299 */
300 v9fs_vfs_setattr_dotl(dentry, &iattr);
301 }
302 break;
303 case ACL_TYPE_DEFAULT:
304 if (!S_ISDIR(inode->i_mode)) {
305 retval = acl ? -EINVAL : 0;
306 goto err_out;
307 }
308 break;
309 default:
310 BUG();
311 }
312 retval = v9fs_xattr_set(dentry, handler->name, value, size, flags);
313 if (!retval)
314 set_cached_acl(inode, handler->flags, acl);
315err_out:
316 posix_acl_release(acl);
317 return retval;
318}
319
320const struct xattr_handler v9fs_xattr_acl_access_handler = {
321 .name = XATTR_NAME_POSIX_ACL_ACCESS,
322 .flags = ACL_TYPE_ACCESS,
323 .get = v9fs_xattr_get_acl,
324 .set = v9fs_xattr_set_acl,
325};
326
327const struct xattr_handler v9fs_xattr_acl_default_handler = {
328 .name = XATTR_NAME_POSIX_ACL_DEFAULT,
329 .flags = ACL_TYPE_DEFAULT,
330 .get = v9fs_xattr_get_acl,
331 .set = v9fs_xattr_set_acl,
332};