blob: 87ee309d4c24d10e6dcac60f7d8bca17558553b2 [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
70/**
Steven Whitehouse77386e12006-11-29 10:41:49 -050071 * gfs2_check_acl - Check an ACL to see if we're allowed to do something
David Teiglandb3b94fa2006-01-16 16:50:04 +000072 * @inode: the file we want to do something to
73 * @mask: what we want to do
74 *
75 * Returns: errno
76 */
77
Steven Whitehouse77386e12006-11-29 10:41:49 -050078int gfs2_check_acl(struct inode *inode, int mask)
David Teiglandb3b94fa2006-01-16 16:50:04 +000079{
Steven Whitehouse479c4272009-10-02 12:00:00 +010080 struct posix_acl *acl;
David Teiglandb3b94fa2006-01-16 16:50:04 +000081 int error;
82
Steven Whitehouse479c4272009-10-02 12:00:00 +010083 acl = gfs2_acl_get(GFS2_I(inode), ACL_TYPE_ACCESS);
84 if (IS_ERR(acl))
85 return PTR_ERR(acl);
David Teiglandb3b94fa2006-01-16 16:50:04 +000086
87 if (acl) {
88 error = posix_acl_permission(inode, acl, mask);
89 posix_acl_release(acl);
90 return error;
91 }
92
93 return -EAGAIN;
94}
95
Steven Whitehouse69dca422009-09-29 12:40:19 +010096static int gfs2_set_mode(struct inode *inode, mode_t mode)
David Teiglandb3b94fa2006-01-16 16:50:04 +000097{
Steven Whitehouse69dca422009-09-29 12:40:19 +010098 int error = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +000099
Steven Whitehouse69dca422009-09-29 12:40:19 +0100100 if (mode != inode->i_mode) {
101 struct iattr iattr;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000102
Steven Whitehouse69dca422009-09-29 12:40:19 +0100103 iattr.ia_valid = ATTR_MODE;
104 iattr.ia_mode = mode;
105
106 error = gfs2_setattr_simple(GFS2_I(inode), &iattr);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000107 }
108
Steven Whitehouse69dca422009-09-29 12:40:19 +0100109 return error;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000110}
111
Steven Whitehouse479c4272009-10-02 12:00:00 +0100112static int gfs2_acl_set(struct inode *inode, int type, struct posix_acl *acl)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000113{
David Teiglandb3b94fa2006-01-16 16:50:04 +0000114 int error;
Steven Whitehouse479c4272009-10-02 12:00:00 +0100115 int len;
116 char *data;
117 const char *name = gfs2_acl_name(type);
118
119 BUG_ON(name == NULL);
120 len = posix_acl_to_xattr(acl, NULL, 0);
121 if (len == 0)
122 return 0;
123 data = kmalloc(len, GFP_NOFS);
124 if (data == NULL)
125 return -ENOMEM;
126 error = posix_acl_to_xattr(acl, data, len);
127 if (error < 0)
128 goto out;
Christoph Hellwig431547b2009-11-13 09:52:56 +0000129 error = __gfs2_xattr_set(inode, name, data, len, 0, GFS2_EATYPE_SYS);
Steven Whitehouse106381b2009-09-29 16:26:23 +0100130 if (!error)
131 set_cached_acl(inode, type, acl);
Steven Whitehouse479c4272009-10-02 12:00:00 +0100132out:
133 kfree(data);
134 return error;
135}
136
137int gfs2_acl_create(struct gfs2_inode *dip, struct inode *inode)
138{
139 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
140 struct posix_acl *acl, *clone;
141 mode_t mode = inode->i_mode;
142 int error = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000143
144 if (!sdp->sd_args.ar_posix_acl)
145 return 0;
Steven Whitehouse479c4272009-10-02 12:00:00 +0100146 if (S_ISLNK(inode->i_mode))
David Teiglandb3b94fa2006-01-16 16:50:04 +0000147 return 0;
148
Steven Whitehouse479c4272009-10-02 12:00:00 +0100149 acl = gfs2_acl_get(dip, ACL_TYPE_DEFAULT);
150 if (IS_ERR(acl))
151 return PTR_ERR(acl);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000152 if (!acl) {
Al Viroce3b0f82009-03-29 19:08:22 -0400153 mode &= ~current_umask();
Steven Whitehouse479c4272009-10-02 12:00:00 +0100154 if (mode != inode->i_mode)
155 error = gfs2_set_mode(inode, mode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000156 return error;
157 }
158
Steven Whitehouse479c4272009-10-02 12:00:00 +0100159 if (S_ISDIR(inode->i_mode)) {
160 error = gfs2_acl_set(inode, ACL_TYPE_DEFAULT, acl);
161 if (error)
162 goto out;
163 }
164
Josef Bacik16c5f062008-04-09 09:33:41 -0400165 clone = posix_acl_clone(acl, GFP_NOFS);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000166 error = -ENOMEM;
167 if (!clone)
168 goto out;
169 posix_acl_release(acl);
170 acl = clone;
171
David Teiglandb3b94fa2006-01-16 16:50:04 +0000172 error = posix_acl_create_masq(acl, &mode);
173 if (error < 0)
174 goto out;
Steven Whitehouse40b78a32009-08-26 18:41:32 +0100175 if (error == 0)
176 goto munge;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000177
Steven Whitehouse479c4272009-10-02 12:00:00 +0100178 error = gfs2_acl_set(inode, ACL_TYPE_ACCESS, acl);
Steven Whitehouse40b78a32009-08-26 18:41:32 +0100179 if (error)
180 goto out;
181munge:
Steven Whitehouse479c4272009-10-02 12:00:00 +0100182 error = gfs2_set_mode(inode, mode);
Steven Whitehousea91ea692006-09-04 12:04:26 -0400183out:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000184 posix_acl_release(acl);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000185 return error;
186}
187
188int gfs2_acl_chmod(struct gfs2_inode *ip, struct iattr *attr)
189{
Steven Whitehouse479c4272009-10-02 12:00:00 +0100190 struct posix_acl *acl, *clone;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000191 char *data;
192 unsigned int len;
193 int error;
194
Steven Whitehouse479c4272009-10-02 12:00:00 +0100195 acl = gfs2_acl_get(ip, ACL_TYPE_ACCESS);
196 if (IS_ERR(acl))
197 return PTR_ERR(acl);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000198 if (!acl)
199 return gfs2_setattr_simple(ip, attr);
200
Josef Bacik16c5f062008-04-09 09:33:41 -0400201 clone = posix_acl_clone(acl, GFP_NOFS);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000202 error = -ENOMEM;
203 if (!clone)
204 goto out;
205 posix_acl_release(acl);
206 acl = clone;
207
208 error = posix_acl_chmod_masq(acl, attr->ia_mode);
209 if (!error) {
Steven Whitehouse479c4272009-10-02 12:00:00 +0100210 len = posix_acl_to_xattr(acl, NULL, 0);
211 data = kmalloc(len, GFP_NOFS);
212 error = -ENOMEM;
213 if (data == NULL)
214 goto out;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000215 posix_acl_to_xattr(acl, data, len);
Steven Whitehouse479c4272009-10-02 12:00:00 +0100216 error = gfs2_xattr_acl_chmod(ip, attr, data);
217 kfree(data);
Steven Whitehouse106381b2009-09-29 16:26:23 +0100218 set_cached_acl(&ip->i_inode, ACL_TYPE_ACCESS, acl);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000219 }
220
Steven Whitehousea91ea692006-09-04 12:04:26 -0400221out:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000222 posix_acl_release(acl);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000223 return error;
224}
225
Steven Whitehouse2646a1f2009-10-02 11:50:54 +0100226static int gfs2_acl_type(const char *name)
227{
228 if (strcmp(name, GFS2_POSIX_ACL_ACCESS) == 0)
229 return ACL_TYPE_ACCESS;
230 if (strcmp(name, GFS2_POSIX_ACL_DEFAULT) == 0)
231 return ACL_TYPE_DEFAULT;
232 return -EINVAL;
233}
234
Christoph Hellwig431547b2009-11-13 09:52:56 +0000235static int gfs2_xattr_system_get(struct dentry *dentry, const char *name,
236 void *buffer, size_t size, int xtype)
Steven Whitehouse2646a1f2009-10-02 11:50:54 +0100237{
Christoph Hellwig431547b2009-11-13 09:52:56 +0000238 struct inode *inode = dentry->d_inode;
Steven Whitehouse106381b2009-09-29 16:26:23 +0100239 struct posix_acl *acl;
Steven Whitehouse2646a1f2009-10-02 11:50:54 +0100240 int type;
Steven Whitehouse106381b2009-09-29 16:26:23 +0100241 int error;
Steven Whitehouse2646a1f2009-10-02 11:50:54 +0100242
243 type = gfs2_acl_type(name);
244 if (type < 0)
245 return type;
246
Steven Whitehouse106381b2009-09-29 16:26:23 +0100247 acl = gfs2_acl_get(GFS2_I(inode), type);
248 if (IS_ERR(acl))
249 return PTR_ERR(acl);
250 if (acl == NULL)
251 return -ENODATA;
Steven Whitehouse2646a1f2009-10-02 11:50:54 +0100252
Steven Whitehouse106381b2009-09-29 16:26:23 +0100253 error = posix_acl_to_xattr(acl, buffer, size);
254 posix_acl_release(acl);
255
256 return error;
257}
Steven Whitehouse2646a1f2009-10-02 11:50:54 +0100258
Christoph Hellwig431547b2009-11-13 09:52:56 +0000259static int gfs2_xattr_system_set(struct dentry *dentry, const char *name,
260 const void *value, size_t size, int flags,
261 int xtype)
Steven Whitehouse2646a1f2009-10-02 11:50:54 +0100262{
Christoph Hellwig431547b2009-11-13 09:52:56 +0000263 struct inode *inode = dentry->d_inode;
Steven Whitehouse2646a1f2009-10-02 11:50:54 +0100264 struct gfs2_sbd *sdp = GFS2_SB(inode);
265 struct posix_acl *acl = NULL;
266 int error = 0, type;
267
268 if (!sdp->sd_args.ar_posix_acl)
269 return -EOPNOTSUPP;
270
271 type = gfs2_acl_type(name);
272 if (type < 0)
273 return type;
274 if (flags & XATTR_CREATE)
275 return -EINVAL;
276 if (type == ACL_TYPE_DEFAULT && !S_ISDIR(inode->i_mode))
277 return value ? -EACCES : 0;
278 if ((current_fsuid() != inode->i_uid) && !capable(CAP_FOWNER))
279 return -EPERM;
280 if (S_ISLNK(inode->i_mode))
281 return -EOPNOTSUPP;
282
283 if (!value)
284 goto set_acl;
285
286 acl = posix_acl_from_xattr(value, size);
287 if (!acl) {
288 /*
289 * acl_set_file(3) may request that we set default ACLs with
290 * zero length -- defend (gracefully) against that here.
291 */
292 goto out;
293 }
294 if (IS_ERR(acl)) {
295 error = PTR_ERR(acl);
296 goto out;
297 }
298
299 error = posix_acl_valid(acl);
300 if (error)
301 goto out_release;
302
303 error = -EINVAL;
304 if (acl->a_count > GFS2_ACL_MAX_ENTRIES)
305 goto out_release;
306
307 if (type == ACL_TYPE_ACCESS) {
308 mode_t mode = inode->i_mode;
309 error = posix_acl_equiv_mode(acl, &mode);
310
311 if (error <= 0) {
312 posix_acl_release(acl);
313 acl = NULL;
314
315 if (error < 0)
316 return error;
317 }
318
319 error = gfs2_set_mode(inode, mode);
320 if (error)
321 goto out_release;
322 }
323
324set_acl:
Christoph Hellwig431547b2009-11-13 09:52:56 +0000325 error = __gfs2_xattr_set(inode, name, value, size, 0, GFS2_EATYPE_SYS);
Steven Whitehouse106381b2009-09-29 16:26:23 +0100326 if (!error) {
327 if (acl)
328 set_cached_acl(inode, type, acl);
329 else
330 forget_cached_acl(inode, type);
331 }
Steven Whitehouse2646a1f2009-10-02 11:50:54 +0100332out_release:
333 posix_acl_release(acl);
334out:
335 return error;
336}
337
338struct xattr_handler gfs2_xattr_system_handler = {
339 .prefix = XATTR_SYSTEM_PREFIX,
Christoph Hellwig431547b2009-11-13 09:52:56 +0000340 .flags = GFS2_EATYPE_SYS,
Steven Whitehouse2646a1f2009-10-02 11:50:54 +0100341 .get = gfs2_xattr_system_get,
342 .set = gfs2_xattr_system_set,
343};
344