blob: 34501b64bc47a416993677b641b30fe64a84d13c [file] [log] [blame]
David Teiglandb3b94fa2006-01-16 16:50:04 +00001/*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
Steven Whitehouse3a8a9a12006-05-18 15:09:15 -04003 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
David Teiglandb3b94fa2006-01-16 16:50:04 +00004 *
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
Steven Whitehousee9fc2aa2006-09-01 11:05:15 -04007 * of the GNU General Public License version 2.
David Teiglandb3b94fa2006-01-16 16:50:04 +00008 */
9
10#include <linux/sched.h>
11#include <linux/slab.h>
12#include <linux/spinlock.h>
13#include <linux/completion.h>
14#include <linux/buffer_head.h>
Steven Whitehouse2646a1f2009-10-02 11:50:54 +010015#include <linux/xattr.h>
David Teiglandb3b94fa2006-01-16 16:50:04 +000016#include <linux/posix_acl.h>
17#include <linux/posix_acl_xattr.h>
Steven Whitehouse5c676f62006-02-27 17:23:27 -050018#include <linux/gfs2_ondisk.h>
David Teiglandb3b94fa2006-01-16 16:50:04 +000019
20#include "gfs2.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050021#include "incore.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000022#include "acl.h"
Steven Whitehouse307cf6e2009-08-26 18:51:04 +010023#include "xattr.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000024#include "glock.h"
25#include "inode.h"
26#include "meta_io.h"
27#include "trans.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050028#include "util.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000029
Steven Whitehouse479c4272009-10-02 12:00:00 +010030static const char *gfs2_acl_name(int type)
David Teiglandb3b94fa2006-01-16 16:50:04 +000031{
Steven Whitehouse479c4272009-10-02 12:00:00 +010032 switch (type) {
33 case ACL_TYPE_ACCESS:
34 return GFS2_POSIX_ACL_ACCESS;
35 case ACL_TYPE_DEFAULT:
36 return GFS2_POSIX_ACL_DEFAULT;
37 }
38 return NULL;
39}
David Teiglandb3b94fa2006-01-16 16:50:04 +000040
Steven Whitehouse479c4272009-10-02 12:00:00 +010041static struct posix_acl *gfs2_acl_get(struct gfs2_inode *ip, int type)
42{
43 struct posix_acl *acl;
44 const char *name;
45 char *data;
46 int len;
Steven Whitehouse40b78a32009-08-26 18:41:32 +010047
Steven Whitehouse3767ac22008-11-03 14:28:42 +000048 if (!ip->i_eattr)
Steven Whitehouse479c4272009-10-02 12:00:00 +010049 return NULL;
David Teiglandb3b94fa2006-01-16 16:50:04 +000050
Steven Whitehouse106381b2009-09-29 16:26:23 +010051 acl = get_cached_acl(&ip->i_inode, type);
52 if (acl != ACL_NOT_CACHED)
53 return acl;
54
Steven Whitehouse479c4272009-10-02 12:00:00 +010055 name = gfs2_acl_name(type);
56 if (name == NULL)
57 return ERR_PTR(-EINVAL);
David Teiglandb3b94fa2006-01-16 16:50:04 +000058
Steven Whitehouse479c4272009-10-02 12:00:00 +010059 len = gfs2_xattr_acl_get(ip, name, &data);
60 if (len < 0)
61 return ERR_PTR(len);
62 if (len == 0)
63 return NULL;
David Teiglandb3b94fa2006-01-16 16:50:04 +000064
Steven Whitehouse479c4272009-10-02 12:00:00 +010065 acl = posix_acl_from_xattr(data, len);
66 kfree(data);
67 return acl;
David Teiglandb3b94fa2006-01-16 16:50:04 +000068}
69
Christoph Hellwig4e34e712011-07-23 17:37:31 +020070struct posix_acl *gfs2_get_acl(struct inode *inode, int type)
David Teiglandb3b94fa2006-01-16 16:50:04 +000071{
Christoph Hellwig4e34e712011-07-23 17:37:31 +020072 return gfs2_acl_get(GFS2_I(inode), type);
David Teiglandb3b94fa2006-01-16 16:50:04 +000073}
74
Al Virod3fb6122011-07-23 18:37:50 -040075static int gfs2_set_mode(struct inode *inode, umode_t mode)
David Teiglandb3b94fa2006-01-16 16:50:04 +000076{
Steven Whitehouse69dca422009-09-29 12:40:19 +010077 int error = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +000078
Steven Whitehouse69dca422009-09-29 12:40:19 +010079 if (mode != inode->i_mode) {
80 struct iattr iattr;
David Teiglandb3b94fa2006-01-16 16:50:04 +000081
Steven Whitehouse69dca422009-09-29 12:40:19 +010082 iattr.ia_valid = ATTR_MODE;
83 iattr.ia_mode = mode;
84
85 error = gfs2_setattr_simple(GFS2_I(inode), &iattr);
David Teiglandb3b94fa2006-01-16 16:50:04 +000086 }
87
Steven Whitehouse69dca422009-09-29 12:40:19 +010088 return error;
David Teiglandb3b94fa2006-01-16 16:50:04 +000089}
90
Steven Whitehouse479c4272009-10-02 12:00:00 +010091static int gfs2_acl_set(struct inode *inode, int type, struct posix_acl *acl)
David Teiglandb3b94fa2006-01-16 16:50:04 +000092{
David Teiglandb3b94fa2006-01-16 16:50:04 +000093 int error;
Steven Whitehouse479c4272009-10-02 12:00:00 +010094 int len;
95 char *data;
96 const char *name = gfs2_acl_name(type);
97
98 BUG_ON(name == NULL);
99 len = posix_acl_to_xattr(acl, NULL, 0);
100 if (len == 0)
101 return 0;
102 data = kmalloc(len, GFP_NOFS);
103 if (data == NULL)
104 return -ENOMEM;
105 error = posix_acl_to_xattr(acl, data, len);
106 if (error < 0)
107 goto out;
Christoph Hellwig431547b2009-11-13 09:52:56 +0000108 error = __gfs2_xattr_set(inode, name, data, len, 0, GFS2_EATYPE_SYS);
Steven Whitehouse106381b2009-09-29 16:26:23 +0100109 if (!error)
110 set_cached_acl(inode, type, acl);
Steven Whitehouse479c4272009-10-02 12:00:00 +0100111out:
112 kfree(data);
113 return error;
114}
115
116int gfs2_acl_create(struct gfs2_inode *dip, struct inode *inode)
117{
118 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
Al Viro826cae22011-07-23 03:10:32 -0400119 struct posix_acl *acl;
Al Virod3fb6122011-07-23 18:37:50 -0400120 umode_t mode = inode->i_mode;
Steven Whitehouse479c4272009-10-02 12:00:00 +0100121 int error = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000122
123 if (!sdp->sd_args.ar_posix_acl)
124 return 0;
Steven Whitehouse479c4272009-10-02 12:00:00 +0100125 if (S_ISLNK(inode->i_mode))
David Teiglandb3b94fa2006-01-16 16:50:04 +0000126 return 0;
127
Steven Whitehouse479c4272009-10-02 12:00:00 +0100128 acl = gfs2_acl_get(dip, ACL_TYPE_DEFAULT);
129 if (IS_ERR(acl))
130 return PTR_ERR(acl);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000131 if (!acl) {
Al Viroce3b0f82009-03-29 19:08:22 -0400132 mode &= ~current_umask();
Steven Whitehouse479c4272009-10-02 12:00:00 +0100133 if (mode != inode->i_mode)
134 error = gfs2_set_mode(inode, mode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000135 return error;
136 }
137
Steven Whitehouse479c4272009-10-02 12:00:00 +0100138 if (S_ISDIR(inode->i_mode)) {
139 error = gfs2_acl_set(inode, ACL_TYPE_DEFAULT, acl);
140 if (error)
141 goto out;
142 }
143
Al Viro826cae22011-07-23 03:10:32 -0400144 error = posix_acl_create(&acl, GFP_NOFS, &mode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000145 if (error < 0)
Al Viro826cae22011-07-23 03:10:32 -0400146 return error;
147
Steven Whitehouse40b78a32009-08-26 18:41:32 +0100148 if (error == 0)
149 goto munge;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000150
Steven Whitehouse479c4272009-10-02 12:00:00 +0100151 error = gfs2_acl_set(inode, ACL_TYPE_ACCESS, acl);
Steven Whitehouse40b78a32009-08-26 18:41:32 +0100152 if (error)
153 goto out;
154munge:
Steven Whitehouse479c4272009-10-02 12:00:00 +0100155 error = gfs2_set_mode(inode, mode);
Steven Whitehousea91ea692006-09-04 12:04:26 -0400156out:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000157 posix_acl_release(acl);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000158 return error;
159}
160
161int gfs2_acl_chmod(struct gfs2_inode *ip, struct iattr *attr)
162{
Al Virobc26ab52011-07-23 00:18:02 -0400163 struct posix_acl *acl;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000164 char *data;
165 unsigned int len;
166 int error;
167
Steven Whitehouse479c4272009-10-02 12:00:00 +0100168 acl = gfs2_acl_get(ip, ACL_TYPE_ACCESS);
169 if (IS_ERR(acl))
170 return PTR_ERR(acl);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000171 if (!acl)
172 return gfs2_setattr_simple(ip, attr);
173
Al Virobc26ab52011-07-23 00:18:02 -0400174 error = posix_acl_chmod(&acl, GFP_NOFS, attr->ia_mode);
175 if (error)
176 return error;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000177
Al Virobc26ab52011-07-23 00:18:02 -0400178 len = posix_acl_to_xattr(acl, NULL, 0);
179 data = kmalloc(len, GFP_NOFS);
180 error = -ENOMEM;
181 if (data == NULL)
182 goto out;
183 posix_acl_to_xattr(acl, data, len);
184 error = gfs2_xattr_acl_chmod(ip, attr, data);
185 kfree(data);
186 set_cached_acl(&ip->i_inode, ACL_TYPE_ACCESS, acl);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000187
Steven Whitehousea91ea692006-09-04 12:04:26 -0400188out:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000189 posix_acl_release(acl);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000190 return error;
191}
192
Steven Whitehouse2646a1f2009-10-02 11:50:54 +0100193static int gfs2_acl_type(const char *name)
194{
195 if (strcmp(name, GFS2_POSIX_ACL_ACCESS) == 0)
196 return ACL_TYPE_ACCESS;
197 if (strcmp(name, GFS2_POSIX_ACL_DEFAULT) == 0)
198 return ACL_TYPE_DEFAULT;
199 return -EINVAL;
200}
201
Christoph Hellwig431547b2009-11-13 09:52:56 +0000202static int gfs2_xattr_system_get(struct dentry *dentry, const char *name,
203 void *buffer, size_t size, int xtype)
Steven Whitehouse2646a1f2009-10-02 11:50:54 +0100204{
Christoph Hellwig431547b2009-11-13 09:52:56 +0000205 struct inode *inode = dentry->d_inode;
Steven Whitehousef72f2d22010-05-21 16:12:27 +0100206 struct gfs2_sbd *sdp = GFS2_SB(inode);
Steven Whitehouse106381b2009-09-29 16:26:23 +0100207 struct posix_acl *acl;
Steven Whitehouse2646a1f2009-10-02 11:50:54 +0100208 int type;
Steven Whitehouse106381b2009-09-29 16:26:23 +0100209 int error;
Steven Whitehouse2646a1f2009-10-02 11:50:54 +0100210
Steven Whitehousef72f2d22010-05-21 16:12:27 +0100211 if (!sdp->sd_args.ar_posix_acl)
212 return -EOPNOTSUPP;
213
Steven Whitehouse2646a1f2009-10-02 11:50:54 +0100214 type = gfs2_acl_type(name);
215 if (type < 0)
216 return type;
217
Steven Whitehouse106381b2009-09-29 16:26:23 +0100218 acl = gfs2_acl_get(GFS2_I(inode), type);
219 if (IS_ERR(acl))
220 return PTR_ERR(acl);
221 if (acl == NULL)
222 return -ENODATA;
Steven Whitehouse2646a1f2009-10-02 11:50:54 +0100223
Steven Whitehouse106381b2009-09-29 16:26:23 +0100224 error = posix_acl_to_xattr(acl, buffer, size);
225 posix_acl_release(acl);
226
227 return error;
228}
Steven Whitehouse2646a1f2009-10-02 11:50:54 +0100229
Christoph Hellwig431547b2009-11-13 09:52:56 +0000230static int gfs2_xattr_system_set(struct dentry *dentry, const char *name,
231 const void *value, size_t size, int flags,
232 int xtype)
Steven Whitehouse2646a1f2009-10-02 11:50:54 +0100233{
Christoph Hellwig431547b2009-11-13 09:52:56 +0000234 struct inode *inode = dentry->d_inode;
Steven Whitehouse2646a1f2009-10-02 11:50:54 +0100235 struct gfs2_sbd *sdp = GFS2_SB(inode);
236 struct posix_acl *acl = NULL;
237 int error = 0, type;
238
239 if (!sdp->sd_args.ar_posix_acl)
240 return -EOPNOTSUPP;
241
242 type = gfs2_acl_type(name);
243 if (type < 0)
244 return type;
245 if (flags & XATTR_CREATE)
246 return -EINVAL;
247 if (type == ACL_TYPE_DEFAULT && !S_ISDIR(inode->i_mode))
248 return value ? -EACCES : 0;
249 if ((current_fsuid() != inode->i_uid) && !capable(CAP_FOWNER))
250 return -EPERM;
251 if (S_ISLNK(inode->i_mode))
252 return -EOPNOTSUPP;
253
254 if (!value)
255 goto set_acl;
256
257 acl = posix_acl_from_xattr(value, size);
258 if (!acl) {
259 /*
260 * acl_set_file(3) may request that we set default ACLs with
261 * zero length -- defend (gracefully) against that here.
262 */
263 goto out;
264 }
265 if (IS_ERR(acl)) {
266 error = PTR_ERR(acl);
267 goto out;
268 }
269
270 error = posix_acl_valid(acl);
271 if (error)
272 goto out_release;
273
274 error = -EINVAL;
275 if (acl->a_count > GFS2_ACL_MAX_ENTRIES)
276 goto out_release;
277
278 if (type == ACL_TYPE_ACCESS) {
Al Virod6952122011-07-23 18:56:36 -0400279 umode_t mode = inode->i_mode;
Steven Whitehouse2646a1f2009-10-02 11:50:54 +0100280 error = posix_acl_equiv_mode(acl, &mode);
281
282 if (error <= 0) {
283 posix_acl_release(acl);
284 acl = NULL;
285
286 if (error < 0)
287 return error;
288 }
289
290 error = gfs2_set_mode(inode, mode);
291 if (error)
292 goto out_release;
293 }
294
295set_acl:
Christoph Hellwig431547b2009-11-13 09:52:56 +0000296 error = __gfs2_xattr_set(inode, name, value, size, 0, GFS2_EATYPE_SYS);
Steven Whitehouse106381b2009-09-29 16:26:23 +0100297 if (!error) {
298 if (acl)
299 set_cached_acl(inode, type, acl);
300 else
301 forget_cached_acl(inode, type);
302 }
Steven Whitehouse2646a1f2009-10-02 11:50:54 +0100303out_release:
304 posix_acl_release(acl);
305out:
306 return error;
307}
308
Stephen Hemmingerb7bb0a12010-05-13 17:53:23 -0700309const struct xattr_handler gfs2_xattr_system_handler = {
Steven Whitehouse2646a1f2009-10-02 11:50:54 +0100310 .prefix = XATTR_SYSTEM_PREFIX,
Christoph Hellwig431547b2009-11-13 09:52:56 +0000311 .flags = GFS2_EATYPE_SYS,
Steven Whitehouse2646a1f2009-10-02 11:50:54 +0100312 .get = gfs2_xattr_system_get,
313 .set = gfs2_xattr_system_set,
314};
315