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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 user_namespace *mnt_userns, 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(&init_user_ns, 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->i_ctime = current_time(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}
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 "rgrp.h"
28#include "trans.h"
29#include "util.h"
30
31static const char *gfs2_acl_name(int type)
32{
33 switch (type) {
34 case ACL_TYPE_ACCESS:
35 return XATTR_POSIX_ACL_ACCESS;
36 case ACL_TYPE_DEFAULT:
37 return XATTR_POSIX_ACL_DEFAULT;
38 }
39 return NULL;
40}
41
42static struct posix_acl *__gfs2_get_acl(struct inode *inode, int type)
43{
44 struct gfs2_inode *ip = GFS2_I(inode);
45 struct posix_acl *acl;
46 const char *name;
47 char *data;
48 int len;
49
50 if (!ip->i_eattr)
51 return NULL;
52
53 name = gfs2_acl_name(type);
54 len = gfs2_xattr_acl_get(ip, name, &data);
55 if (len <= 0)
56 return ERR_PTR(len);
57 acl = posix_acl_from_xattr(&init_user_ns, data, len);
58 kfree(data);
59 return acl;
60}
61
62struct posix_acl *gfs2_get_acl(struct inode *inode, int type)
63{
64 struct gfs2_inode *ip = GFS2_I(inode);
65 struct gfs2_holder gh;
66 bool need_unlock = false;
67 struct posix_acl *acl;
68
69 if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
70 int ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
71 LM_FLAG_ANY, &gh);
72 if (ret)
73 return ERR_PTR(ret);
74 need_unlock = true;
75 }
76 acl = __gfs2_get_acl(inode, type);
77 if (need_unlock)
78 gfs2_glock_dq_uninit(&gh);
79 return acl;
80}
81
82int __gfs2_set_acl(struct inode *inode, struct posix_acl *acl, int type)
83{
84 int error;
85 int len;
86 char *data;
87 const char *name = gfs2_acl_name(type);
88
89 if (acl) {
90 len = posix_acl_to_xattr(&init_user_ns, acl, NULL, 0);
91 if (len == 0)
92 return 0;
93 data = kmalloc(len, GFP_NOFS);
94 if (data == NULL)
95 return -ENOMEM;
96 error = posix_acl_to_xattr(&init_user_ns, acl, data, len);
97 if (error < 0)
98 goto out;
99 } else {
100 data = NULL;
101 len = 0;
102 }
103
104 error = __gfs2_xattr_set(inode, name, data, len, 0, GFS2_EATYPE_SYS);
105 if (error)
106 goto out;
107 set_cached_acl(inode, type, acl);
108out:
109 kfree(data);
110 return error;
111}
112
113int gfs2_set_acl(struct inode *inode, struct posix_acl *acl, int type)
114{
115 struct gfs2_inode *ip = GFS2_I(inode);
116 struct gfs2_holder gh;
117 bool need_unlock = false;
118 int ret;
119 umode_t mode;
120
121 if (acl && acl->a_count > GFS2_ACL_MAX_ENTRIES(GFS2_SB(inode)))
122 return -E2BIG;
123
124 ret = gfs2_rsqa_alloc(ip);
125 if (ret)
126 return ret;
127
128 if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
129 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
130 if (ret)
131 return ret;
132 need_unlock = true;
133 }
134
135 mode = inode->i_mode;
136 if (type == ACL_TYPE_ACCESS && acl) {
137 ret = posix_acl_update_mode(inode, &mode, &acl);
138 if (ret)
139 goto unlock;
140 }
141
142 ret = __gfs2_set_acl(inode, acl, type);
143 if (!ret && mode != inode->i_mode) {
144 inode->i_ctime = current_time(inode);
145 inode->i_mode = mode;
146 mark_inode_dirty(inode);
147 }
148unlock:
149 if (need_unlock)
150 gfs2_glock_dq_uninit(&gh);
151 return ret;
152}