Commit | Line | Data |
---|---|---|
85ff872d AK |
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> | |
22d8dcdf | 20 | #include <linux/sched.h> |
85ff872d AK |
21 | #include <linux/posix_acl_xattr.h> |
22 | #include "xattr.h" | |
23 | #include "acl.h" | |
76381a42 | 24 | #include "v9fs.h" |
5ffc0cb3 | 25 | #include "v9fs_vfs.h" |
85ff872d AK |
26 | |
27 | static struct posix_acl *__v9fs_get_acl(struct p9_fid *fid, char *name) | |
28 | { | |
29 | ssize_t size; | |
30 | void *value = NULL; | |
009ca389 | 31 | struct posix_acl *acl = NULL; |
85ff872d AK |
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) { | |
5f3a4a28 | 40 | acl = posix_acl_from_xattr(&init_user_ns, value, size); |
85ff872d AK |
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 | ||
50 | err_out: | |
51 | kfree(value); | |
52 | return acl; | |
53 | } | |
54 | ||
55 | int v9fs_get_acl(struct inode *inode, struct p9_fid *fid) | |
56 | { | |
57 | int retval = 0; | |
58 | struct posix_acl *pacl, *dacl; | |
76381a42 | 59 | struct v9fs_session_info *v9ses; |
85ff872d | 60 | |
76381a42 | 61 | v9ses = v9fs_inode2v9ses(inode); |
e782ef71 VJJ |
62 | if (((v9ses->flags & V9FS_ACCESS_MASK) != V9FS_ACCESS_CLIENT) || |
63 | ((v9ses->flags & V9FS_ACL_MASK) != V9FS_POSIX_ACL)) { | |
76381a42 AK |
64 | set_cached_acl(inode, ACL_TYPE_DEFAULT, NULL); |
65 | set_cached_acl(inode, ACL_TYPE_ACCESS, NULL); | |
66 | return 0; | |
67 | } | |
85ff872d AK |
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); | |
85ff872d AK |
75 | } else |
76 | retval = -EIO; | |
77 | ||
c61fa0d6 VJJ |
78 | if (!IS_ERR(dacl)) |
79 | posix_acl_release(dacl); | |
80 | ||
81 | if (!IS_ERR(pacl)) | |
82 | posix_acl_release(pacl); | |
83 | ||
85ff872d AK |
84 | return retval; |
85 | } | |
86 | ||
87 | static 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 | ||
4e34e719 | 99 | struct posix_acl *v9fs_iop_get_acl(struct inode *inode, int type) |
85ff872d | 100 | { |
76381a42 AK |
101 | struct v9fs_session_info *v9ses; |
102 | ||
103 | v9ses = v9fs_inode2v9ses(inode); | |
e782ef71 VJJ |
104 | if (((v9ses->flags & V9FS_ACCESS_MASK) != V9FS_ACCESS_CLIENT) || |
105 | ((v9ses->flags & V9FS_ACL_MASK) != V9FS_POSIX_ACL)) { | |
76381a42 | 106 | /* |
e782ef71 | 107 | * On access = client and acl = on mode get the acl |
76381a42 AK |
108 | * values from the server |
109 | */ | |
4e34e719 | 110 | return NULL; |
76381a42 | 111 | } |
4e34e719 CH |
112 | return v9fs_get_cached_acl(inode, type); |
113 | ||
85ff872d | 114 | } |
7a4566b0 | 115 | |
6e8dc555 AK |
116 | static 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; | |
d344b0fb VJJ |
122 | if (!acl) |
123 | return 0; | |
124 | ||
6e8dc555 AK |
125 | /* Set a setxattr request to server */ |
126 | size = posix_acl_xattr_size(acl->a_count); | |
127 | buffer = kmalloc(size, GFP_KERNEL); | |
128 | if (!buffer) | |
129 | return -ENOMEM; | |
5f3a4a28 | 130 | retval = posix_acl_to_xattr(&init_user_ns, acl, buffer, size); |
6e8dc555 AK |
131 | if (retval < 0) |
132 | goto err_free_out; | |
133 | switch (type) { | |
134 | case ACL_TYPE_ACCESS: | |
135 | name = POSIX_ACL_XATTR_ACCESS; | |
136 | break; | |
137 | case ACL_TYPE_DEFAULT: | |
138 | name = POSIX_ACL_XATTR_DEFAULT; | |
139 | break; | |
140 | default: | |
141 | BUG(); | |
142 | } | |
143 | retval = v9fs_xattr_set(dentry, name, buffer, size, 0); | |
144 | err_free_out: | |
145 | kfree(buffer); | |
146 | return retval; | |
147 | } | |
148 | ||
149 | int v9fs_acl_chmod(struct dentry *dentry) | |
150 | { | |
151 | int retval = 0; | |
bc26ab5f | 152 | struct posix_acl *acl; |
6e8dc555 AK |
153 | struct inode *inode = dentry->d_inode; |
154 | ||
155 | if (S_ISLNK(inode->i_mode)) | |
156 | return -EOPNOTSUPP; | |
157 | acl = v9fs_get_cached_acl(inode, ACL_TYPE_ACCESS); | |
158 | if (acl) { | |
bc26ab5f AV |
159 | retval = posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode); |
160 | if (retval) | |
161 | return retval; | |
7f165aaa | 162 | set_cached_acl(inode, ACL_TYPE_ACCESS, acl); |
bc26ab5f | 163 | retval = v9fs_set_acl(dentry, ACL_TYPE_ACCESS, acl); |
6e8dc555 | 164 | posix_acl_release(acl); |
6e8dc555 AK |
165 | } |
166 | return retval; | |
167 | } | |
168 | ||
ad77dbce | 169 | int v9fs_set_create_acl(struct dentry *dentry, |
1ec95bf3 | 170 | struct posix_acl **dpacl, struct posix_acl **pacl) |
ad77dbce | 171 | { |
1ec95bf3 | 172 | if (dentry) { |
7f165aaa | 173 | set_cached_acl(dentry->d_inode, ACL_TYPE_DEFAULT, *dpacl); |
1ec95bf3 | 174 | v9fs_set_acl(dentry, ACL_TYPE_DEFAULT, *dpacl); |
7f165aaa | 175 | set_cached_acl(dentry->d_inode, ACL_TYPE_ACCESS, *pacl); |
1ec95bf3 AV |
176 | v9fs_set_acl(dentry, ACL_TYPE_ACCESS, *pacl); |
177 | } | |
178 | posix_acl_release(*dpacl); | |
179 | posix_acl_release(*pacl); | |
180 | *dpacl = *pacl = NULL; | |
ad77dbce AK |
181 | return 0; |
182 | } | |
183 | ||
d3fb6120 | 184 | int v9fs_acl_mode(struct inode *dir, umode_t *modep, |
ad77dbce AK |
185 | struct posix_acl **dpacl, struct posix_acl **pacl) |
186 | { | |
187 | int retval = 0; | |
d3fb6120 | 188 | umode_t mode = *modep; |
ad77dbce AK |
189 | struct posix_acl *acl = NULL; |
190 | ||
191 | if (!S_ISLNK(mode)) { | |
192 | acl = v9fs_get_cached_acl(dir, ACL_TYPE_DEFAULT); | |
193 | if (IS_ERR(acl)) | |
194 | return PTR_ERR(acl); | |
195 | if (!acl) | |
196 | mode &= ~current_umask(); | |
197 | } | |
198 | if (acl) { | |
ad77dbce | 199 | if (S_ISDIR(mode)) |
1ec95bf3 | 200 | *dpacl = posix_acl_dup(acl); |
826cae2f AV |
201 | retval = posix_acl_create(&acl, GFP_NOFS, &mode); |
202 | if (retval < 0) | |
203 | return retval; | |
ad77dbce | 204 | if (retval > 0) |
826cae2f | 205 | *pacl = acl; |
1ec95bf3 | 206 | else |
826cae2f | 207 | posix_acl_release(acl); |
ad77dbce AK |
208 | } |
209 | *modep = mode; | |
210 | return 0; | |
ad77dbce AK |
211 | } |
212 | ||
76381a42 AK |
213 | static int v9fs_remote_get_acl(struct dentry *dentry, const char *name, |
214 | void *buffer, size_t size, int type) | |
215 | { | |
216 | char *full_name; | |
217 | ||
218 | switch (type) { | |
219 | case ACL_TYPE_ACCESS: | |
220 | full_name = POSIX_ACL_XATTR_ACCESS; | |
221 | break; | |
222 | case ACL_TYPE_DEFAULT: | |
223 | full_name = POSIX_ACL_XATTR_DEFAULT; | |
224 | break; | |
225 | default: | |
226 | BUG(); | |
227 | } | |
228 | return v9fs_xattr_get(dentry, full_name, buffer, size); | |
229 | } | |
230 | ||
7a4566b0 AK |
231 | static int v9fs_xattr_get_acl(struct dentry *dentry, const char *name, |
232 | void *buffer, size_t size, int type) | |
233 | { | |
76381a42 | 234 | struct v9fs_session_info *v9ses; |
7a4566b0 AK |
235 | struct posix_acl *acl; |
236 | int error; | |
237 | ||
238 | if (strcmp(name, "") != 0) | |
239 | return -EINVAL; | |
240 | ||
42869c8a | 241 | v9ses = v9fs_dentry2v9ses(dentry); |
76381a42 AK |
242 | /* |
243 | * We allow set/get/list of acl when access=client is not specified | |
244 | */ | |
245 | if ((v9ses->flags & V9FS_ACCESS_MASK) != V9FS_ACCESS_CLIENT) | |
246 | return v9fs_remote_get_acl(dentry, name, buffer, size, type); | |
247 | ||
7a4566b0 AK |
248 | acl = v9fs_get_cached_acl(dentry->d_inode, type); |
249 | if (IS_ERR(acl)) | |
250 | return PTR_ERR(acl); | |
251 | if (acl == NULL) | |
252 | return -ENODATA; | |
5f3a4a28 | 253 | error = posix_acl_to_xattr(&init_user_ns, acl, buffer, size); |
7a4566b0 AK |
254 | posix_acl_release(acl); |
255 | ||
256 | return error; | |
257 | } | |
258 | ||
76381a42 AK |
259 | static int v9fs_remote_set_acl(struct dentry *dentry, const char *name, |
260 | const void *value, size_t size, | |
261 | int flags, int type) | |
262 | { | |
263 | char *full_name; | |
264 | ||
265 | switch (type) { | |
266 | case ACL_TYPE_ACCESS: | |
267 | full_name = POSIX_ACL_XATTR_ACCESS; | |
268 | break; | |
269 | case ACL_TYPE_DEFAULT: | |
270 | full_name = POSIX_ACL_XATTR_DEFAULT; | |
271 | break; | |
272 | default: | |
273 | BUG(); | |
274 | } | |
275 | return v9fs_xattr_set(dentry, full_name, value, size, flags); | |
276 | } | |
277 | ||
278 | ||
7a4566b0 AK |
279 | static int v9fs_xattr_set_acl(struct dentry *dentry, const char *name, |
280 | const void *value, size_t size, | |
281 | int flags, int type) | |
282 | { | |
22d8dcdf AK |
283 | int retval; |
284 | struct posix_acl *acl; | |
76381a42 | 285 | struct v9fs_session_info *v9ses; |
22d8dcdf AK |
286 | struct inode *inode = dentry->d_inode; |
287 | ||
288 | if (strcmp(name, "") != 0) | |
289 | return -EINVAL; | |
76381a42 | 290 | |
42869c8a | 291 | v9ses = v9fs_dentry2v9ses(dentry); |
76381a42 AK |
292 | /* |
293 | * set the attribute on the remote. Without even looking at the | |
294 | * xattr value. We leave it to the server to validate | |
295 | */ | |
296 | if ((v9ses->flags & V9FS_ACCESS_MASK) != V9FS_ACCESS_CLIENT) | |
297 | return v9fs_remote_set_acl(dentry, name, | |
298 | value, size, flags, type); | |
299 | ||
22d8dcdf AK |
300 | if (S_ISLNK(inode->i_mode)) |
301 | return -EOPNOTSUPP; | |
2e149670 | 302 | if (!inode_owner_or_capable(inode)) |
22d8dcdf AK |
303 | return -EPERM; |
304 | if (value) { | |
305 | /* update the cached acl value */ | |
5f3a4a28 | 306 | acl = posix_acl_from_xattr(&init_user_ns, value, size); |
22d8dcdf AK |
307 | if (IS_ERR(acl)) |
308 | return PTR_ERR(acl); | |
309 | else if (acl) { | |
310 | retval = posix_acl_valid(acl); | |
311 | if (retval) | |
312 | goto err_out; | |
313 | } | |
314 | } else | |
315 | acl = NULL; | |
316 | ||
317 | switch (type) { | |
318 | case ACL_TYPE_ACCESS: | |
319 | name = POSIX_ACL_XATTR_ACCESS; | |
320 | if (acl) { | |
d6952123 | 321 | umode_t mode = inode->i_mode; |
22d8dcdf AK |
322 | retval = posix_acl_equiv_mode(acl, &mode); |
323 | if (retval < 0) | |
324 | goto err_out; | |
325 | else { | |
326 | struct iattr iattr; | |
327 | if (retval == 0) { | |
328 | /* | |
329 | * ACL can be represented | |
330 | * by the mode bits. So don't | |
331 | * update ACL. | |
332 | */ | |
333 | acl = NULL; | |
334 | value = NULL; | |
335 | size = 0; | |
336 | } | |
337 | /* Updte the mode bits */ | |
338 | iattr.ia_mode = ((mode & S_IALLUGO) | | |
339 | (inode->i_mode & ~S_IALLUGO)); | |
340 | iattr.ia_valid = ATTR_MODE; | |
341 | /* FIXME should we update ctime ? | |
342 | * What is the following setxattr update the | |
343 | * mode ? | |
344 | */ | |
345 | v9fs_vfs_setattr_dotl(dentry, &iattr); | |
346 | } | |
347 | } | |
348 | break; | |
349 | case ACL_TYPE_DEFAULT: | |
350 | name = POSIX_ACL_XATTR_DEFAULT; | |
351 | if (!S_ISDIR(inode->i_mode)) { | |
6f81c115 | 352 | retval = acl ? -EINVAL : 0; |
22d8dcdf AK |
353 | goto err_out; |
354 | } | |
355 | break; | |
356 | default: | |
357 | BUG(); | |
358 | } | |
359 | retval = v9fs_xattr_set(dentry, name, value, size, flags); | |
360 | if (!retval) | |
361 | set_cached_acl(inode, type, acl); | |
362 | err_out: | |
363 | posix_acl_release(acl); | |
364 | return retval; | |
7a4566b0 AK |
365 | } |
366 | ||
367 | const struct xattr_handler v9fs_xattr_acl_access_handler = { | |
368 | .prefix = POSIX_ACL_XATTR_ACCESS, | |
369 | .flags = ACL_TYPE_ACCESS, | |
370 | .get = v9fs_xattr_get_acl, | |
371 | .set = v9fs_xattr_set_acl, | |
372 | }; | |
373 | ||
374 | const struct xattr_handler v9fs_xattr_acl_default_handler = { | |
375 | .prefix = POSIX_ACL_XATTR_DEFAULT, | |
376 | .flags = ACL_TYPE_DEFAULT, | |
377 | .get = v9fs_xattr_get_acl, | |
378 | .set = v9fs_xattr_set_acl, | |
379 | }; |