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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/*
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 && acl->a_count > GFS2_ACL_MAX_ENTRIES(GFS2_SB(inode)))
90 return -E2BIG;
91
92 if (type == ACL_TYPE_ACCESS) {
93 umode_t mode = inode->i_mode;
94
95 error = posix_acl_update_mode(inode, &inode->i_mode, &acl);
96 if (error)
97 return error;
98 if (mode != inode->i_mode)
99 mark_inode_dirty(inode);
100 }
101
102 if (acl) {
103 len = posix_acl_to_xattr(&init_user_ns, acl, NULL, 0);
104 if (len == 0)
105 return 0;
106 data = kmalloc(len, GFP_NOFS);
107 if (data == NULL)
108 return -ENOMEM;
109 error = posix_acl_to_xattr(&init_user_ns, acl, data, len);
110 if (error < 0)
111 goto out;
112 } else {
113 data = NULL;
114 len = 0;
115 }
116
117 error = __gfs2_xattr_set(inode, name, data, len, 0, GFS2_EATYPE_SYS);
118 if (error)
119 goto out;
120 set_cached_acl(inode, type, acl);
121out:
122 kfree(data);
123 return error;
124}
125
126int gfs2_set_acl(struct inode *inode, struct posix_acl *acl, int type)
127{
128 struct gfs2_inode *ip = GFS2_I(inode);
129 struct gfs2_holder gh;
130 bool need_unlock = false;
131 int ret;
132
133 ret = gfs2_rsqa_alloc(ip);
134 if (ret)
135 return ret;
136
137 if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
138 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
139 if (ret)
140 return ret;
141 need_unlock = true;
142 }
143 ret = __gfs2_set_acl(inode, acl, type);
144 if (need_unlock)
145 gfs2_glock_dq_uninit(&gh);
146 return ret;
147}