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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// 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}