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192.168.1.100 / T108 / e958203796650e3959a43708d67534bf36f4c83b / . / marvell / linux / fs / jfs / acl.c
blob: 92cc0ac2d1fc12d11596ebe5b2778a100be6fa3b [file] [log] [blame]
b.liue9582032025-04-17 19:18:16 +0800[diff] [blame^]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)
18{
19 struct posix_acl *acl;
20 char *ea_name;
21 int size;
22 char *value = NULL;
23
24 switch(type) {
25 case ACL_TYPE_ACCESS:
26 ea_name = XATTR_NAME_POSIX_ACL_ACCESS;
27 break;
28 case ACL_TYPE_DEFAULT:
29 ea_name = XATTR_NAME_POSIX_ACL_DEFAULT;
30 break;
31 default:
32 return ERR_PTR(-EINVAL);
33 }
34
35 size = __jfs_getxattr(inode, ea_name, NULL, 0);
36
37 if (size > 0) {
38 value = kmalloc(size, GFP_KERNEL);
39 if (!value)
40 return ERR_PTR(-ENOMEM);
41 size = __jfs_getxattr(inode, ea_name, value, size);
42 }
43
44 if (size < 0) {
45 if (size == -ENODATA)
46 acl = NULL;
47 else
48 acl = ERR_PTR(size);
49 } else {
50 acl = posix_acl_from_xattr(&init_user_ns, value, size);
51 }
52 kfree(value);
53 return acl;
54}
55
56static int __jfs_set_acl(tid_t tid, struct inode *inode, int type,
57 struct posix_acl *acl)
58{
59 char *ea_name;
60 int rc;
61 int size = 0;
62 char *value = NULL;
63
64 switch (type) {
65 case ACL_TYPE_ACCESS:
66 ea_name = XATTR_NAME_POSIX_ACL_ACCESS;
67 break;
68 case ACL_TYPE_DEFAULT:
69 ea_name = XATTR_NAME_POSIX_ACL_DEFAULT;
70 break;
71 default:
72 return -EINVAL;
73 }
74
75 if (acl) {
76 size = posix_acl_xattr_size(acl->a_count);
77 value = kmalloc(size, GFP_KERNEL);
78 if (!value)
79 return -ENOMEM;
80 rc = posix_acl_to_xattr(&init_user_ns, acl, value, size);
81 if (rc < 0)
82 goto out;
83 }
84 rc = __jfs_setxattr(tid, inode, ea_name, value, size, 0);
85out:
86 kfree(value);
87
88 if (!rc)
89 set_cached_acl(inode, type, acl);
90
91 return rc;
92}
93
94int jfs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
95{
96 int rc;
97 tid_t tid;
98 int update_mode = 0;
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(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->i_ctime = current_time(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}