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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 "rgrp.h"
25#include "trans.h"
26#include "util.h"
27
28static const char *gfs2_acl_name(int type)
29{
30 switch (type) {
31 case ACL_TYPE_ACCESS:
32 return XATTR_POSIX_ACL_ACCESS;
33 case ACL_TYPE_DEFAULT:
34 return XATTR_POSIX_ACL_DEFAULT;
35 }
36 return NULL;
37}
38
39static struct posix_acl *__gfs2_get_acl(struct inode *inode, int type)
40{
41 struct gfs2_inode *ip = GFS2_I(inode);
42 struct posix_acl *acl;
43 const char *name;
44 char *data;
45 int len;
46
47 if (!ip->i_eattr)
48 return NULL;
49
50 name = gfs2_acl_name(type);
51 len = gfs2_xattr_acl_get(ip, name, &data);
52 if (len <= 0)
53 return ERR_PTR(len);
54 acl = posix_acl_from_xattr(&init_user_ns, data, len);
55 kfree(data);
56 return acl;
57}
58
59struct posix_acl *gfs2_get_acl(struct inode *inode, int type)
60{
61 struct gfs2_inode *ip = GFS2_I(inode);
62 struct gfs2_holder gh;
63 bool need_unlock = false;
64 struct posix_acl *acl;
65
66 if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
67 int ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
68 LM_FLAG_ANY, &gh);
69 if (ret)
70 return ERR_PTR(ret);
71 need_unlock = true;
72 }
73 acl = __gfs2_get_acl(inode, type);
74 if (need_unlock)
75 gfs2_glock_dq_uninit(&gh);
76 return acl;
77}
78
79int __gfs2_set_acl(struct inode *inode, struct posix_acl *acl, int type)
80{
81 int error;
82 size_t len;
83 char *data;
84 const char *name = gfs2_acl_name(type);
85
86 if (acl) {
87 len = posix_acl_xattr_size(acl->a_count);
88 data = kmalloc(len, GFP_NOFS);
89 if (data == NULL)
90 return -ENOMEM;
91 error = posix_acl_to_xattr(&init_user_ns, acl, data, len);
92 if (error < 0)
93 goto out;
94 } else {
95 data = NULL;
96 len = 0;
97 }
98
99 error = __gfs2_xattr_set(inode, name, data, len, 0, GFS2_EATYPE_SYS);
100 if (error)
101 goto out;
102 set_cached_acl(inode, type, acl);
103out:
104 kfree(data);
105 return error;
106}
107
108int gfs2_set_acl(struct inode *inode, struct posix_acl *acl, int type)
109{
110 struct gfs2_inode *ip = GFS2_I(inode);
111 struct gfs2_holder gh;
112 bool need_unlock = false;
113 int ret;
114 umode_t mode;
115
116 if (acl && acl->a_count > GFS2_ACL_MAX_ENTRIES(GFS2_SB(inode)))
117 return -E2BIG;
118
119 ret = gfs2_rsqa_alloc(ip);
120 if (ret)
121 return ret;
122
123 if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
124 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
125 if (ret)
126 return ret;
127 need_unlock = true;
128 }
129
130 mode = inode->i_mode;
131 if (type == ACL_TYPE_ACCESS && acl) {
132 ret = posix_acl_update_mode(inode, &mode, &acl);
133 if (ret)
134 goto unlock;
135 }
136
137 ret = __gfs2_set_acl(inode, acl, type);
138 if (!ret && mode != inode->i_mode) {
139 inode->i_ctime = current_time(inode);
140 inode->i_mode = mode;
141 mark_inode_dirty(inode);
142 }
143unlock:
144 if (need_unlock)
145 gfs2_glock_dq_uninit(&gh);
146 return ret;
147}