1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (C) International Business Machines Corp., 2002-2004
4 * Copyright (C) Andreas Gruenbacher, 2001
5 * Copyright (C) Linus Torvalds, 1991, 1992
6 */
7
8 #include <linux/sched.h>
9 #include <linux/slab.h>
10 #include <linux/fs.h>
11 #include <linux/posix_acl_xattr.h>
12 #include "jfs_incore.h"
13 #include "jfs_txnmgr.h"
14 #include "jfs_xattr.h"
15 #include "jfs_acl.h"
16
jfs_get_acl(struct inode * inode,int type,bool rcu)17 struct posix_acl *jfs_get_acl(struct inode *inode, int type, bool rcu)
18 {
19 struct posix_acl *acl;
20 char *ea_name;
21 int size;
22 char *value = NULL;
23
24 if (rcu)
25 return ERR_PTR(-ECHILD);
26
27 switch(type) {
28 case ACL_TYPE_ACCESS:
29 ea_name = XATTR_NAME_POSIX_ACL_ACCESS;
30 break;
31 case ACL_TYPE_DEFAULT:
32 ea_name = XATTR_NAME_POSIX_ACL_DEFAULT;
33 break;
34 default:
35 return ERR_PTR(-EINVAL);
36 }
37
38 size = __jfs_getxattr(inode, ea_name, NULL, 0);
39
40 if (size > 0) {
41 value = kmalloc(size, GFP_KERNEL);
42 if (!value)
43 return ERR_PTR(-ENOMEM);
44 size = __jfs_getxattr(inode, ea_name, value, size);
45 }
46
47 if (size < 0) {
48 if (size == -ENODATA)
49 acl = NULL;
50 else
51 acl = ERR_PTR(size);
52 } else {
53 acl = posix_acl_from_xattr(&init_user_ns, value, size);
54 }
55 kfree(value);
56 return acl;
57 }
58
__jfs_set_acl(tid_t tid,struct inode * inode,int type,struct posix_acl * acl)59 static int __jfs_set_acl(tid_t tid, struct inode *inode, int type,
60 struct posix_acl *acl)
61 {
62 char *ea_name;
63 int rc;
64 int size = 0;
65 char *value = NULL;
66
67 switch (type) {
68 case ACL_TYPE_ACCESS:
69 ea_name = XATTR_NAME_POSIX_ACL_ACCESS;
70 break;
71 case ACL_TYPE_DEFAULT:
72 ea_name = XATTR_NAME_POSIX_ACL_DEFAULT;
73 break;
74 default:
75 return -EINVAL;
76 }
77
78 if (acl) {
79 size = posix_acl_xattr_size(acl->a_count);
80 value = kmalloc(size, GFP_KERNEL);
81 if (!value)
82 return -ENOMEM;
83 rc = posix_acl_to_xattr(&init_user_ns, acl, value, size);
84 if (rc < 0)
85 goto out;
86 }
87 rc = __jfs_setxattr(tid, inode, ea_name, value, size, 0);
88 out:
89 kfree(value);
90
91 if (!rc)
92 set_cached_acl(inode, type, acl);
93
94 return rc;
95 }
96
jfs_set_acl(struct user_namespace * mnt_userns,struct inode * inode,struct posix_acl * acl,int type)97 int jfs_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
98 struct posix_acl *acl, int type)
99 {
100 int rc;
101 tid_t tid;
102 int update_mode = 0;
103 umode_t mode = inode->i_mode;
104
105 tid = txBegin(inode->i_sb, 0);
106 mutex_lock(&JFS_IP(inode)->commit_mutex);
107 if (type == ACL_TYPE_ACCESS && acl) {
108 rc = posix_acl_update_mode(&init_user_ns, inode, &mode, &acl);
109 if (rc)
110 goto end_tx;
111 if (mode != inode->i_mode)
112 update_mode = 1;
113 }
114 rc = __jfs_set_acl(tid, inode, type, acl);
115 if (!rc) {
116 if (update_mode) {
117 inode->i_mode = mode;
118 inode->i_ctime = current_time(inode);
119 mark_inode_dirty(inode);
120 }
121 rc = txCommit(tid, 1, &inode, 0);
122 }
123 end_tx:
124 txEnd(tid);
125 mutex_unlock(&JFS_IP(inode)->commit_mutex);
126 return rc;
127 }
128
jfs_init_acl(tid_t tid,struct inode * inode,struct inode * dir)129 int jfs_init_acl(tid_t tid, struct inode *inode, struct inode *dir)
130 {
131 struct posix_acl *default_acl, *acl;
132 int rc = 0;
133
134 rc = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl);
135 if (rc)
136 return rc;
137
138 if (default_acl) {
139 rc = __jfs_set_acl(tid, inode, ACL_TYPE_DEFAULT, default_acl);
140 posix_acl_release(default_acl);
141 } else {
142 inode->i_default_acl = NULL;
143 }
144
145 if (acl) {
146 if (!rc)
147 rc = __jfs_set_acl(tid, inode, ACL_TYPE_ACCESS, acl);
148 posix_acl_release(acl);
149 } else {
150 inode->i_acl = NULL;
151 }
152
153 JFS_IP(inode)->mode2 = (JFS_IP(inode)->mode2 & 0xffff0000) |
154 inode->i_mode;
155
156 return rc;
157 }
158