1/*
2 *   Copyright (C) International Business Machines  Corp., 2002-2004
3 *   Copyright (C) Andreas Gruenbacher, 2001
4 *   Copyright (C) Linus Torvalds, 1991, 1992
5 *
6 *   This program is free software;  you can redistribute it and/or modify
7 *   it under the terms of the GNU General Public License as published by
8 *   the Free Software Foundation; either version 2 of the License, or
9 *   (at your option) any later version.
10 *
11 *   This program is distributed in the hope that it will be useful,
12 *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
13 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
14 *   the GNU General Public License for more details.
15 *
16 *   You should have received a copy of the GNU General Public License
17 *   along with this program;  if not, write to the Free Software
18 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
21#include <linux/sched.h>
22#include <linux/slab.h>
23#include <linux/fs.h>
24#include <linux/posix_acl_xattr.h>
25#include "jfs_incore.h"
26#include "jfs_txnmgr.h"
27#include "jfs_xattr.h"
28#include "jfs_acl.h"
29
30struct posix_acl *jfs_get_acl(struct inode *inode, int type)
31{
32	struct posix_acl *acl;
33	char *ea_name;
34	int size;
35	char *value = NULL;
36
37	acl = get_cached_acl(inode, type);
38	if (acl != ACL_NOT_CACHED)
39		return acl;
40
41	switch(type) {
42		case ACL_TYPE_ACCESS:
43			ea_name = POSIX_ACL_XATTR_ACCESS;
44			break;
45		case ACL_TYPE_DEFAULT:
46			ea_name = POSIX_ACL_XATTR_DEFAULT;
47			break;
48		default:
49			return ERR_PTR(-EINVAL);
50	}
51
52	size = __jfs_getxattr(inode, ea_name, NULL, 0);
53
54	if (size > 0) {
55		value = kmalloc(size, GFP_KERNEL);
56		if (!value)
57			return ERR_PTR(-ENOMEM);
58		size = __jfs_getxattr(inode, ea_name, value, size);
59	}
60
61	if (size < 0) {
62		if (size == -ENODATA)
63			acl = NULL;
64		else
65			acl = ERR_PTR(size);
66	} else {
67		acl = posix_acl_from_xattr(&init_user_ns, value, size);
68	}
69	kfree(value);
70	if (!IS_ERR(acl))
71		set_cached_acl(inode, type, acl);
72	return acl;
73}
74
75static int __jfs_set_acl(tid_t tid, struct inode *inode, int type,
76		       struct posix_acl *acl)
77{
78	char *ea_name;
79	int rc;
80	int size = 0;
81	char *value = NULL;
82
83	switch (type) {
84	case ACL_TYPE_ACCESS:
85		ea_name = POSIX_ACL_XATTR_ACCESS;
86		if (acl) {
87			rc = posix_acl_equiv_mode(acl, &inode->i_mode);
88			if (rc < 0)
89				return rc;
90			inode->i_ctime = CURRENT_TIME;
91			mark_inode_dirty(inode);
92			if (rc == 0)
93				acl = NULL;
94		}
95		break;
96	case ACL_TYPE_DEFAULT:
97		ea_name = POSIX_ACL_XATTR_DEFAULT;
98		break;
99	default:
100		return -EINVAL;
101	}
102
103	if (acl) {
104		size = posix_acl_xattr_size(acl->a_count);
105		value = kmalloc(size, GFP_KERNEL);
106		if (!value)
107			return -ENOMEM;
108		rc = posix_acl_to_xattr(&init_user_ns, acl, value, size);
109		if (rc < 0)
110			goto out;
111	}
112	rc = __jfs_setxattr(tid, inode, ea_name, value, size, 0);
113out:
114	kfree(value);
115
116	if (!rc)
117		set_cached_acl(inode, type, acl);
118
119	return rc;
120}
121
122int jfs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
123{
124	int rc;
125	tid_t tid;
126
127	tid = txBegin(inode->i_sb, 0);
128	mutex_lock(&JFS_IP(inode)->commit_mutex);
129	rc = __jfs_set_acl(tid, inode, type, acl);
130	if (!rc)
131		rc = txCommit(tid, 1, &inode, 0);
132	txEnd(tid);
133	mutex_unlock(&JFS_IP(inode)->commit_mutex);
134	return rc;
135}
136
137int jfs_init_acl(tid_t tid, struct inode *inode, struct inode *dir)
138{
139	struct posix_acl *default_acl, *acl;
140	int rc = 0;
141
142	rc = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl);
143	if (rc)
144		return rc;
145
146	if (default_acl) {
147		rc = __jfs_set_acl(tid, inode, ACL_TYPE_DEFAULT, default_acl);
148		posix_acl_release(default_acl);
149	}
150
151	if (acl) {
152		if (!rc)
153			rc = __jfs_set_acl(tid, inode, ACL_TYPE_ACCESS, acl);
154		posix_acl_release(acl);
155	}
156
157	JFS_IP(inode)->mode2 = (JFS_IP(inode)->mode2 & 0xffff0000) |
158			       inode->i_mode;
159
160	return rc;
161}
162