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Aneesh Kumar K.V85ff8722010-09-28 00:27:39 +05301/*
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>
Aneesh Kumar K.V22d8dcd2010-09-28 00:27:40 +053020#include <linux/sched.h>
Aneesh Kumar K.V85ff8722010-09-28 00:27:39 +053021#include <linux/posix_acl_xattr.h>
22#include "xattr.h"
23#include "acl.h"
Aneesh Kumar K.V76381a42010-09-28 00:27:41 +053024#include "v9fs.h"
Aneesh Kumar K.V5ffc0cb2011-02-28 17:04:01 +053025#include "v9fs_vfs.h"
Al Viro0f235ca2013-01-31 12:54:47 -050026#include "fid.h"
Aneesh Kumar K.V85ff8722010-09-28 00:27:39 +053027
28static struct posix_acl *__v9fs_get_acl(struct p9_fid *fid, char *name)
29{
30 ssize_t size;
31 void *value = NULL;
Joe Perches009ca382010-11-15 03:04:51 +000032 struct posix_acl *acl = NULL;
Aneesh Kumar K.V85ff8722010-09-28 00:27:39 +053033
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) {
Eric W. Biederman5f3a4a22012-09-10 20:17:44 -070041 acl = posix_acl_from_xattr(&init_user_ns, value, size);
Aneesh Kumar K.V85ff8722010-09-28 00:27:39 +053042 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;
Aneesh Kumar K.V76381a42010-09-28 00:27:41 +053060 struct v9fs_session_info *v9ses;
Aneesh Kumar K.V85ff8722010-09-28 00:27:39 +053061
Aneesh Kumar K.V76381a42010-09-28 00:27:41 +053062 v9ses = v9fs_inode2v9ses(inode);
Venkateswararao Jujjuri (JV)e782ef72011-01-25 15:40:54 -080063 if (((v9ses->flags & V9FS_ACCESS_MASK) != V9FS_ACCESS_CLIENT) ||
64 ((v9ses->flags & V9FS_ACL_MASK) != V9FS_POSIX_ACL)) {
Aneesh Kumar K.V76381a42010-09-28 00:27:41 +053065 set_cached_acl(inode, ACL_TYPE_DEFAULT, NULL);
66 set_cached_acl(inode, ACL_TYPE_ACCESS, NULL);
67 return 0;
68 }
Aneesh Kumar K.V85ff8722010-09-28 00:27:39 +053069 /* get the default/access acl values and cache them */
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);
Aneesh Kumar K.V85ff8722010-09-28 00:27:39 +053076 } else
77 retval = -EIO;
78
Venkateswararao Jujjuri (JV)c61fa0d2011-01-13 15:28:39 -080079 if (!IS_ERR(dacl))
80 posix_acl_release(dacl);
81
82 if (!IS_ERR(pacl))
83 posix_acl_release(pacl);
84
Aneesh Kumar K.V85ff8722010-09-28 00:27:39 +053085 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
Christoph Hellwig4e34e712011-07-23 17:37:31 +0200100struct posix_acl *v9fs_iop_get_acl(struct inode *inode, int type)
Aneesh Kumar K.V85ff8722010-09-28 00:27:39 +0530101{
Aneesh Kumar K.V76381a42010-09-28 00:27:41 +0530102 struct v9fs_session_info *v9ses;
103
104 v9ses = v9fs_inode2v9ses(inode);
Venkateswararao Jujjuri (JV)e782ef72011-01-25 15:40:54 -0800105 if (((v9ses->flags & V9FS_ACCESS_MASK) != V9FS_ACCESS_CLIENT) ||
106 ((v9ses->flags & V9FS_ACL_MASK) != V9FS_POSIX_ACL)) {
Aneesh Kumar K.V76381a42010-09-28 00:27:41 +0530107 /*
Venkateswararao Jujjuri (JV)e782ef72011-01-25 15:40:54 -0800108 * On access = client and acl = on mode get the acl
Aneesh Kumar K.V76381a42010-09-28 00:27:41 +0530109 * values from the server
110 */
Christoph Hellwig4e34e712011-07-23 17:37:31 +0200111 return NULL;
Aneesh Kumar K.V76381a42010-09-28 00:27:41 +0530112 }
Christoph Hellwig4e34e712011-07-23 17:37:31 +0200113 return v9fs_get_cached_acl(inode, type);
Aneesh Kumar K.V85ff8722010-09-28 00:27:39 +0530114
Aneesh Kumar K.V85ff8722010-09-28 00:27:39 +0530115}
Aneesh Kumar K.V7a4566b2010-09-28 00:27:39 +0530116
Al Viro0f235ca2013-01-31 12:54:47 -0500117static int v9fs_set_acl(struct p9_fid *fid, int type, struct posix_acl *acl)
Aneesh Kumar K.V6e8dc552010-09-28 00:27:40 +0530118{
119 int retval;
120 char *name;
121 size_t size;
122 void *buffer;
Venkateswararao Jujjuri (JV)d344b0f2011-01-13 16:33:00 -0800123 if (!acl)
124 return 0;
125
Aneesh Kumar K.V6e8dc552010-09-28 00:27:40 +0530126 /* 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;
Eric W. Biederman5f3a4a22012-09-10 20:17:44 -0700131 retval = posix_acl_to_xattr(&init_user_ns, acl, buffer, size);
Aneesh Kumar K.V6e8dc552010-09-28 00:27:40 +0530132 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 }
Al Viro0f235ca2013-01-31 12:54:47 -0500144 retval = v9fs_fid_xattr_set(fid, name, buffer, size, 0);
Aneesh Kumar K.V6e8dc552010-09-28 00:27:40 +0530145err_free_out:
146 kfree(buffer);
147 return retval;
148}
149
Al Virobe308f02013-01-31 12:58:16 -0500150int v9fs_acl_chmod(struct inode *inode, struct p9_fid *fid)
Aneesh Kumar K.V6e8dc552010-09-28 00:27:40 +0530151{
152 int retval = 0;
Al Virobc26ab52011-07-23 00:18:02 -0400153 struct posix_acl *acl;
Aneesh Kumar K.V6e8dc552010-09-28 00:27:40 +0530154
155 if (S_ISLNK(inode->i_mode))
156 return -EOPNOTSUPP;
157 acl = v9fs_get_cached_acl(inode, ACL_TYPE_ACCESS);
158 if (acl) {
Al Virobc26ab52011-07-23 00:18:02 -0400159 retval = posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
160 if (retval)
161 return retval;
Al Viro7f165aa2013-01-31 12:46:55 -0500162 set_cached_acl(inode, ACL_TYPE_ACCESS, acl);
Al Viro0f235ca2013-01-31 12:54:47 -0500163 retval = v9fs_set_acl(fid, ACL_TYPE_ACCESS, acl);
Aneesh Kumar K.V6e8dc552010-09-28 00:27:40 +0530164 posix_acl_release(acl);
Aneesh Kumar K.V6e8dc552010-09-28 00:27:40 +0530165 }
166 return retval;
167}
168
Al Viro3592ac42013-01-31 13:45:39 -0500169int v9fs_set_create_acl(struct inode *inode, struct p9_fid *fid,
Al Viro5fa63002013-01-31 13:31:23 -0500170 struct posix_acl *dacl, struct posix_acl *acl)
Aneesh Kumar K.Vad77dbc2010-09-28 00:27:40 +0530171{
Al Viro3592ac42013-01-31 13:45:39 -0500172 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);
Aneesh Kumar K.Vad77dbc2010-09-28 00:27:40 +0530176 return 0;
177}
178
Al Viro5fa63002013-01-31 13:31:23 -0500179void 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
Al Virod3fb6122011-07-23 18:37:50 -0400186int v9fs_acl_mode(struct inode *dir, umode_t *modep,
Aneesh Kumar K.Vad77dbc2010-09-28 00:27:40 +0530187 struct posix_acl **dpacl, struct posix_acl **pacl)
188{
189 int retval = 0;
Al Virod3fb6122011-07-23 18:37:50 -0400190 umode_t mode = *modep;
Aneesh Kumar K.Vad77dbc2010-09-28 00:27:40 +0530191 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) {
Aneesh Kumar K.Vad77dbc2010-09-28 00:27:40 +0530201 if (S_ISDIR(mode))
Al Viro1ec95bf2011-07-23 02:28:13 -0400202 *dpacl = posix_acl_dup(acl);
Al Viro826cae22011-07-23 03:10:32 -0400203 retval = posix_acl_create(&acl, GFP_NOFS, &mode);
204 if (retval < 0)
205 return retval;
Aneesh Kumar K.Vad77dbc2010-09-28 00:27:40 +0530206 if (retval > 0)
Al Viro826cae22011-07-23 03:10:32 -0400207 *pacl = acl;
Al Viro1ec95bf2011-07-23 02:28:13 -0400208 else
Al Viro826cae22011-07-23 03:10:32 -0400209 posix_acl_release(acl);
Aneesh Kumar K.Vad77dbc2010-09-28 00:27:40 +0530210 }
211 *modep = mode;
212 return 0;
Aneesh Kumar K.Vad77dbc2010-09-28 00:27:40 +0530213}
214
Aneesh Kumar K.V76381a42010-09-28 00:27:41 +0530215static 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
Aneesh Kumar K.V7a4566b2010-09-28 00:27:39 +0530233static int v9fs_xattr_get_acl(struct dentry *dentry, const char *name,
234 void *buffer, size_t size, int type)
235{
Aneesh Kumar K.V76381a42010-09-28 00:27:41 +0530236 struct v9fs_session_info *v9ses;
Aneesh Kumar K.V7a4566b2010-09-28 00:27:39 +0530237 struct posix_acl *acl;
238 int error;
239
240 if (strcmp(name, "") != 0)
241 return -EINVAL;
242
Aneesh Kumar K.V42869c82011-03-08 16:39:50 +0530243 v9ses = v9fs_dentry2v9ses(dentry);
Aneesh Kumar K.V76381a42010-09-28 00:27:41 +0530244 /*
245 * We allow set/get/list of acl when access=client is not specified
246 */
247 if ((v9ses->flags & V9FS_ACCESS_MASK) != V9FS_ACCESS_CLIENT)
248 return v9fs_remote_get_acl(dentry, name, buffer, size, type);
249
Aneesh Kumar K.V7a4566b2010-09-28 00:27:39 +0530250 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;
Eric W. Biederman5f3a4a22012-09-10 20:17:44 -0700255 error = posix_acl_to_xattr(&init_user_ns, acl, buffer, size);
Aneesh Kumar K.V7a4566b2010-09-28 00:27:39 +0530256 posix_acl_release(acl);
257
258 return error;
259}
260
Aneesh Kumar K.V76381a42010-09-28 00:27:41 +0530261static 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
Aneesh Kumar K.V7a4566b2010-09-28 00:27:39 +0530281static int v9fs_xattr_set_acl(struct dentry *dentry, const char *name,
282 const void *value, size_t size,
283 int flags, int type)
284{
Aneesh Kumar K.V22d8dcd2010-09-28 00:27:40 +0530285 int retval;
286 struct posix_acl *acl;
Aneesh Kumar K.V76381a42010-09-28 00:27:41 +0530287 struct v9fs_session_info *v9ses;
Aneesh Kumar K.V22d8dcd2010-09-28 00:27:40 +0530288 struct inode *inode = dentry->d_inode;
289
290 if (strcmp(name, "") != 0)
291 return -EINVAL;
Aneesh Kumar K.V76381a42010-09-28 00:27:41 +0530292
Aneesh Kumar K.V42869c82011-03-08 16:39:50 +0530293 v9ses = v9fs_dentry2v9ses(dentry);
Aneesh Kumar K.V76381a42010-09-28 00:27:41 +0530294 /*
295 * set the attribute on the remote. Without even looking at the
296 * xattr value. We leave it to the server to validate
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
Aneesh Kumar K.V22d8dcd2010-09-28 00:27:40 +0530302 if (S_ISLNK(inode->i_mode))
303 return -EOPNOTSUPP;
Serge E. Hallyn2e149672011-03-23 16:43:26 -0700304 if (!inode_owner_or_capable(inode))
Aneesh Kumar K.V22d8dcd2010-09-28 00:27:40 +0530305 return -EPERM;
306 if (value) {
307 /* update the cached acl value */
Eric W. Biederman5f3a4a22012-09-10 20:17:44 -0700308 acl = posix_acl_from_xattr(&init_user_ns, value, size);
Aneesh Kumar K.V22d8dcd2010-09-28 00:27:40 +0530309 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) {
Al Virod6952122011-07-23 18:56:36 -0400323 umode_t mode = inode->i_mode;
Aneesh Kumar K.V22d8dcd2010-09-28 00:27:40 +0530324 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 * ACL can be represented
332 * by the mode bits. So don't
333 * update ACL.
334 */
335 acl = NULL;
336 value = NULL;
337 size = 0;
338 }
339 /* Updte the mode bits */
340 iattr.ia_mode = ((mode & S_IALLUGO) |
341 (inode->i_mode & ~S_IALLUGO));
342 iattr.ia_valid = ATTR_MODE;
343 /* FIXME should we update ctime ?
344 * What is the following setxattr update the
345 * mode ?
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)) {
Aneesh Kumar K.V6f81c112010-12-10 12:19:31 +0530354 retval = acl ? -EINVAL : 0;
Aneesh Kumar K.V22d8dcd2010-09-28 00:27:40 +0530355 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;
Aneesh Kumar K.V7a4566b2010-09-28 00:27:39 +0530367}
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};