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	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);
88out:
89	kfree(value);
90
91	if (!rc)
92		set_cached_acl(inode, type, acl);
93
94	return rc;
95}
96
97int jfs_set_acl(struct mnt_idmap *idmap, struct dentry *dentry,
98		struct posix_acl *acl, int type)
99{
100	int rc;
101	tid_t tid;
102	int update_mode = 0;
103	struct inode *inode = d_inode(dentry);
104	umode_t mode = inode->i_mode;
105
106	tid = txBegin(inode->i_sb, 0);
107	mutex_lock(&JFS_IP(inode)->commit_mutex);
108	if (type == ACL_TYPE_ACCESS && acl) {
109		rc = posix_acl_update_mode(&nop_mnt_idmap, inode, &mode, &acl);
110		if (rc)
111			goto end_tx;
112		if (mode != inode->i_mode)
113			update_mode = 1;
114	}
115	rc = __jfs_set_acl(tid, inode, type, acl);
116	if (!rc) {
117		if (update_mode) {
118			inode->i_mode = mode;
119			inode_set_ctime_current(inode);
120			mark_inode_dirty(inode);
121		}
122		rc = txCommit(tid, 1, &inode, 0);
123	}
124end_tx:
125	txEnd(tid);
126	mutex_unlock(&JFS_IP(inode)->commit_mutex);
127	return rc;
128}
129
130int jfs_init_acl(tid_t tid, struct inode *inode, struct inode *dir)
131{
132	struct posix_acl *default_acl, *acl;
133	int rc = 0;
134
135	rc = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl);
136	if (rc)
137		return rc;
138
139	if (default_acl) {
140		rc = __jfs_set_acl(tid, inode, ACL_TYPE_DEFAULT, default_acl);
141		posix_acl_release(default_acl);
142	} else {
143		inode->i_default_acl = NULL;
144	}
145
146	if (acl) {
147		if (!rc)
148			rc = __jfs_set_acl(tid, inode, ACL_TYPE_ACCESS, acl);
149		posix_acl_release(acl);
150	} else {
151		inode->i_acl = NULL;
152	}
153
154	JFS_IP(inode)->mode2 = (JFS_IP(inode)->mode2 & 0xffff0000) |
155			       inode->i_mode;
156
157	return rc;
158}
159