projects/linux·blob master · refs

153 lines · 3.1 KiB

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
17struct 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
59static 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 size_t 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 value = posix_acl_to_xattr(&init_user_ns, acl, &size, GFP_KERNEL);
80 if (!value)
81 return -ENOMEM;
82 }
83 rc = __jfs_setxattr(tid, inode, ea_name, value, size, 0);
84 kfree(value);
85
86 if (!rc)
87 set_cached_acl(inode, type, acl);
88
89 return rc;
90}
91
92int jfs_set_acl(const struct mnt_idmap *idmap, struct dentry *dentry,
93 struct posix_acl *acl, int type)
94{
95 int rc;
96 tid_t tid;
97 int update_mode = 0;
98 struct inode *inode = d_inode(dentry);
99 umode_t mode = inode->i_mode;
100
101 tid = txBegin(inode->i_sb, 0);
102 mutex_lock(&JFS_IP(inode)->commit_mutex);
103 if (type == ACL_TYPE_ACCESS && acl) {
104 rc = posix_acl_update_mode(&nop_mnt_idmap, inode, &mode, &acl);
105 if (rc)
106 goto end_tx;
107 if (mode != inode->i_mode)
108 update_mode = 1;
109 }
110 rc = __jfs_set_acl(tid, inode, type, acl);
111 if (!rc) {
112 if (update_mode) {
113 inode->i_mode = mode;
114 inode_set_ctime_current(inode);
115 mark_inode_dirty(inode);
116 }
117 rc = txCommit(tid, 1, &inode, 0);
118 }
119end_tx:
120 txEnd(tid);
121 mutex_unlock(&JFS_IP(inode)->commit_mutex);
122 return rc;
123}
124
125int jfs_init_acl(tid_t tid, struct inode *inode, struct inode *dir)
126{
127 struct posix_acl *default_acl, *acl;
128 int rc = 0;
129
130 rc = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl);
131 if (rc)
132 return rc;
133
134 if (default_acl) {
135 rc = __jfs_set_acl(tid, inode, ACL_TYPE_DEFAULT, default_acl);
136 posix_acl_release(default_acl);
137 } else {
138 inode->i_default_acl = NULL;
139 }
140
141 if (acl) {
142 if (!rc)
143 rc = __jfs_set_acl(tid, inode, ACL_TYPE_ACCESS, acl);
144 posix_acl_release(acl);
145 } else {
146 inode->i_acl = NULL;
147 }
148
149 JFS_IP(inode)->mode2 = (JFS_IP(inode)->mode2 & 0xffff0000) |
150 inode->i_mode;
151
152 return rc;
153}