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1/*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
4 *
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
7 * of the GNU General Public License version 2.
8 */
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>
15#include <linux/xattr.h>
16#include <linux/posix_acl.h>
17#include <linux/posix_acl_xattr.h>
18#include <linux/gfs2_ondisk.h>
19
20#include "gfs2.h"
21#include "incore.h"
22#include "acl.h"
23#include "xattr.h"
24#include "glock.h"
25#include "inode.h"
26#include "meta_io.h"
27#include "trans.h"
28#include "util.h"
29
30static const char *gfs2_acl_name(int type)
31{
32 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}
40
41static 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;
47
48 if (!ip->i_eattr)
49 return NULL;
50
51 acl = get_cached_acl(&ip->i_inode, type);
52 if (acl != ACL_NOT_CACHED)
53 return acl;
54
55 name = gfs2_acl_name(type);
56 if (name == NULL)
57 return ERR_PTR(-EINVAL);
58
59 len = gfs2_xattr_acl_get(ip, name, &data);
60 if (len < 0)
61 return ERR_PTR(len);
62 if (len == 0)
63 return NULL;
64
65 acl = posix_acl_from_xattr(data, len);
66 kfree(data);
67 return acl;
68}
69
70struct posix_acl *gfs2_get_acl(struct inode *inode, int type)
71{
72 return gfs2_acl_get(GFS2_I(inode), type);
73}
74
75static int gfs2_set_mode(struct inode *inode, umode_t mode)
76{
77 int error = 0;
78
79 if (mode != inode->i_mode) {
80 struct iattr iattr;
81
82 iattr.ia_valid = ATTR_MODE;
83 iattr.ia_mode = mode;
84
85 error = gfs2_setattr_simple(GFS2_I(inode), &iattr);
86 }
87
88 return error;
89}
90
91static int gfs2_acl_set(struct inode *inode, int type, struct posix_acl *acl)
92{
93 int error;
94 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;
108 error = __gfs2_xattr_set(inode, name, data, len, 0, GFS2_EATYPE_SYS);
109 if (!error)
110 set_cached_acl(inode, type, acl);
111out:
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);
119 struct posix_acl *acl;
120 umode_t mode = inode->i_mode;
121 int error = 0;
122
123 if (!sdp->sd_args.ar_posix_acl)
124 return 0;
125 if (S_ISLNK(inode->i_mode))
126 return 0;
127
128 acl = gfs2_acl_get(dip, ACL_TYPE_DEFAULT);
129 if (IS_ERR(acl))
130 return PTR_ERR(acl);
131 if (!acl) {
132 mode &= ~current_umask();
133 if (mode != inode->i_mode)
134 error = gfs2_set_mode(inode, mode);
135 return error;
136 }
137
138 if (S_ISDIR(inode->i_mode)) {
139 error = gfs2_acl_set(inode, ACL_TYPE_DEFAULT, acl);
140 if (error)
141 goto out;
142 }
143
144 error = posix_acl_create(&acl, GFP_NOFS, &mode);
145 if (error < 0)
146 return error;
147
148 if (error == 0)
149 goto munge;
150
151 error = gfs2_acl_set(inode, ACL_TYPE_ACCESS, acl);
152 if (error)
153 goto out;
154munge:
155 error = gfs2_set_mode(inode, mode);
156out:
157 posix_acl_release(acl);
158 return error;
159}
160
161int gfs2_acl_chmod(struct gfs2_inode *ip, struct iattr *attr)
162{
163 struct posix_acl *acl;
164 char *data;
165 unsigned int len;
166 int error;
167
168 acl = gfs2_acl_get(ip, ACL_TYPE_ACCESS);
169 if (IS_ERR(acl))
170 return PTR_ERR(acl);
171 if (!acl)
172 return gfs2_setattr_simple(ip, attr);
173
174 error = posix_acl_chmod(&acl, GFP_NOFS, attr->ia_mode);
175 if (error)
176 return error;
177
178 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);
187
188out:
189 posix_acl_release(acl);
190 return error;
191}
192
193static 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
202static int gfs2_xattr_system_get(struct dentry *dentry, const char *name,
203 void *buffer, size_t size, int xtype)
204{
205 struct inode *inode = dentry->d_inode;
206 struct gfs2_sbd *sdp = GFS2_SB(inode);
207 struct posix_acl *acl;
208 int type;
209 int error;
210
211 if (!sdp->sd_args.ar_posix_acl)
212 return -EOPNOTSUPP;
213
214 type = gfs2_acl_type(name);
215 if (type < 0)
216 return type;
217
218 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;
223
224 error = posix_acl_to_xattr(acl, buffer, size);
225 posix_acl_release(acl);
226
227 return error;
228}
229
230static int gfs2_xattr_system_set(struct dentry *dentry, const char *name,
231 const void *value, size_t size, int flags,
232 int xtype)
233{
234 struct inode *inode = dentry->d_inode;
235 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) {
279 umode_t mode = inode->i_mode;
280 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:
296 error = __gfs2_xattr_set(inode, name, value, size, 0, GFS2_EATYPE_SYS);
297 if (!error) {
298 if (acl)
299 set_cached_acl(inode, type, acl);
300 else
301 forget_cached_acl(inode, type);
302 }
303out_release:
304 posix_acl_release(acl);
305out:
306 return error;
307}
308
309const struct xattr_handler gfs2_xattr_system_handler = {
310 .prefix = XATTR_SYSTEM_PREFIX,
311 .flags = GFS2_EATYPE_SYS,
312 .get = gfs2_xattr_system_get,
313 .set = gfs2_xattr_system_set,
314};
315
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
4 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
5 */
6
7#include <linux/sched.h>
8#include <linux/slab.h>
9#include <linux/spinlock.h>
10#include <linux/completion.h>
11#include <linux/buffer_head.h>
12#include <linux/xattr.h>
13#include <linux/posix_acl.h>
14#include <linux/posix_acl_xattr.h>
15#include <linux/gfs2_ondisk.h>
16
17#include "gfs2.h"
18#include "incore.h"
19#include "acl.h"
20#include "xattr.h"
21#include "glock.h"
22#include "inode.h"
23#include "meta_io.h"
24#include "quota.h"
25#include "rgrp.h"
26#include "trans.h"
27#include "util.h"
28
29static const char *gfs2_acl_name(int type)
30{
31 switch (type) {
32 case ACL_TYPE_ACCESS:
33 return XATTR_POSIX_ACL_ACCESS;
34 case ACL_TYPE_DEFAULT:
35 return XATTR_POSIX_ACL_DEFAULT;
36 }
37 return NULL;
38}
39
40static struct posix_acl *__gfs2_get_acl(struct inode *inode, int type)
41{
42 struct gfs2_inode *ip = GFS2_I(inode);
43 struct posix_acl *acl;
44 const char *name;
45 char *data;
46 int len;
47
48 if (!ip->i_eattr)
49 return NULL;
50
51 name = gfs2_acl_name(type);
52 len = gfs2_xattr_acl_get(ip, name, &data);
53 if (len <= 0)
54 return ERR_PTR(len);
55 acl = posix_acl_from_xattr(&init_user_ns, data, len);
56 kfree(data);
57 return acl;
58}
59
60struct posix_acl *gfs2_get_acl(struct inode *inode, int type, bool rcu)
61{
62 struct gfs2_inode *ip = GFS2_I(inode);
63 struct gfs2_holder gh;
64 bool need_unlock = false;
65 struct posix_acl *acl;
66
67 if (rcu)
68 return ERR_PTR(-ECHILD);
69
70 if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
71 int ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
72 LM_FLAG_ANY, &gh);
73 if (ret)
74 return ERR_PTR(ret);
75 need_unlock = true;
76 }
77 acl = __gfs2_get_acl(inode, type);
78 if (need_unlock)
79 gfs2_glock_dq_uninit(&gh);
80 return acl;
81}
82
83int __gfs2_set_acl(struct inode *inode, struct posix_acl *acl, int type)
84{
85 int error;
86 size_t len;
87 char *data;
88 const char *name = gfs2_acl_name(type);
89
90 if (acl) {
91 len = posix_acl_xattr_size(acl->a_count);
92 data = kmalloc(len, GFP_NOFS);
93 if (data == NULL)
94 return -ENOMEM;
95 error = posix_acl_to_xattr(&init_user_ns, acl, data, len);
96 if (error < 0)
97 goto out;
98 } else {
99 data = NULL;
100 len = 0;
101 }
102
103 error = __gfs2_xattr_set(inode, name, data, len, 0, GFS2_EATYPE_SYS);
104 if (error)
105 goto out;
106 set_cached_acl(inode, type, acl);
107out:
108 kfree(data);
109 return error;
110}
111
112int gfs2_set_acl(struct mnt_idmap *idmap, struct dentry *dentry,
113 struct posix_acl *acl, int type)
114{
115 struct inode *inode = d_inode(dentry);
116 struct gfs2_inode *ip = GFS2_I(inode);
117 struct gfs2_holder gh;
118 bool need_unlock = false;
119 int ret;
120 umode_t mode;
121
122 if (acl && acl->a_count > GFS2_ACL_MAX_ENTRIES(GFS2_SB(inode)))
123 return -E2BIG;
124
125 ret = gfs2_qa_get(ip);
126 if (ret)
127 return ret;
128
129 if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
130 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
131 if (ret)
132 goto out;
133 need_unlock = true;
134 }
135
136 mode = inode->i_mode;
137 if (type == ACL_TYPE_ACCESS && acl) {
138 ret = posix_acl_update_mode(&nop_mnt_idmap, inode, &mode, &acl);
139 if (ret)
140 goto unlock;
141 }
142
143 ret = __gfs2_set_acl(inode, acl, type);
144 if (!ret && mode != inode->i_mode) {
145 inode_set_ctime_current(inode);
146 inode->i_mode = mode;
147 mark_inode_dirty(inode);
148 }
149unlock:
150 if (need_unlock)
151 gfs2_glock_dq_uninit(&gh);
152out:
153 gfs2_qa_put(ip);
154 return ret;
155}