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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 XATTR_POSIX_ACL_ACCESS;
35 case ACL_TYPE_DEFAULT:
36 return XATTR_POSIX_ACL_DEFAULT;
37 }
38 return NULL;
39}
40
41struct posix_acl *gfs2_get_acl(struct inode *inode, int type)
42{
43 struct gfs2_inode *ip = GFS2_I(inode);
44 struct posix_acl *acl;
45 const char *name;
46 char *data;
47 int len;
48
49 if (!ip->i_eattr)
50 return NULL;
51
52 name = gfs2_acl_name(type);
53 if (name == NULL)
54 return ERR_PTR(-EINVAL);
55
56 len = gfs2_xattr_acl_get(ip, name, &data);
57 if (len < 0)
58 return ERR_PTR(len);
59 if (len == 0)
60 return NULL;
61
62 acl = posix_acl_from_xattr(&init_user_ns, data, len);
63 kfree(data);
64 return acl;
65}
66
67int gfs2_set_acl(struct inode *inode, struct posix_acl *acl, int type)
68{
69 int error;
70 int len;
71 char *data;
72 const char *name = gfs2_acl_name(type);
73
74 BUG_ON(name == NULL);
75
76 if (acl && acl->a_count > GFS2_ACL_MAX_ENTRIES(GFS2_SB(inode)))
77 return -E2BIG;
78
79 if (type == ACL_TYPE_ACCESS) {
80 umode_t mode = inode->i_mode;
81
82 error = posix_acl_equiv_mode(acl, &mode);
83 if (error < 0)
84 return error;
85
86 if (error == 0)
87 acl = NULL;
88
89 if (mode != inode->i_mode) {
90 inode->i_mode = mode;
91 mark_inode_dirty(inode);
92 }
93 }
94
95 if (acl) {
96 len = posix_acl_to_xattr(&init_user_ns, acl, NULL, 0);
97 if (len == 0)
98 return 0;
99 data = kmalloc(len, GFP_NOFS);
100 if (data == NULL)
101 return -ENOMEM;
102 error = posix_acl_to_xattr(&init_user_ns, acl, data, len);
103 if (error < 0)
104 goto out;
105 } else {
106 data = NULL;
107 len = 0;
108 }
109
110 error = __gfs2_xattr_set(inode, name, data, len, 0, GFS2_EATYPE_SYS);
111 if (error)
112 goto out;
113 set_cached_acl(inode, type, acl);
114out:
115 kfree(data);
116 return error;
117}
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)
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 (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
68 int ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
69 LM_FLAG_ANY, &gh);
70 if (ret)
71 return ERR_PTR(ret);
72 need_unlock = true;
73 }
74 acl = __gfs2_get_acl(inode, type);
75 if (need_unlock)
76 gfs2_glock_dq_uninit(&gh);
77 return acl;
78}
79
80int __gfs2_set_acl(struct inode *inode, struct posix_acl *acl, int type)
81{
82 int error;
83 size_t len;
84 char *data;
85 const char *name = gfs2_acl_name(type);
86
87 if (acl) {
88 len = posix_acl_xattr_size(acl->a_count);
89 data = kmalloc(len, GFP_NOFS);
90 if (data == NULL)
91 return -ENOMEM;
92 error = posix_acl_to_xattr(&init_user_ns, acl, data, len);
93 if (error < 0)
94 goto out;
95 } else {
96 data = NULL;
97 len = 0;
98 }
99
100 error = __gfs2_xattr_set(inode, name, data, len, 0, GFS2_EATYPE_SYS);
101 if (error)
102 goto out;
103 set_cached_acl(inode, type, acl);
104out:
105 kfree(data);
106 return error;
107}
108
109int gfs2_set_acl(struct inode *inode, struct posix_acl *acl, int type)
110{
111 struct gfs2_inode *ip = GFS2_I(inode);
112 struct gfs2_holder gh;
113 bool need_unlock = false;
114 int ret;
115 umode_t mode;
116
117 if (acl && acl->a_count > GFS2_ACL_MAX_ENTRIES(GFS2_SB(inode)))
118 return -E2BIG;
119
120 ret = gfs2_qa_get(ip);
121 if (ret)
122 return ret;
123
124 if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
125 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
126 if (ret)
127 goto out;
128 need_unlock = true;
129 }
130
131 mode = inode->i_mode;
132 if (type == ACL_TYPE_ACCESS && acl) {
133 ret = posix_acl_update_mode(inode, &mode, &acl);
134 if (ret)
135 goto unlock;
136 }
137
138 ret = __gfs2_set_acl(inode, acl, type);
139 if (!ret && mode != inode->i_mode) {
140 inode->i_ctime = current_time(inode);
141 inode->i_mode = mode;
142 mark_inode_dirty(inode);
143 }
144unlock:
145 if (need_unlock)
146 gfs2_glock_dq_uninit(&gh);
147out:
148 gfs2_qa_put(ip);
149 return ret;
150}