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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
Dave Kleikamp63f83c92006-10-02 09:55:27 -05008 * the Free Software Foundation; either version 2 of the License, or
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 * (at your option) any later version.
Dave Kleikamp63f83c92006-10-02 09:55:27 -050010 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 * 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
Dave Kleikamp63f83c92006-10-02 09:55:27 -050017 * along with this program; if not, write to the Free Software
Linus Torvalds1da177e2005-04-16 15:20:36 -070018 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
21#include <linux/sched.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090022#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#include <linux/fs.h>
Christoph Hellwig9a59f452005-06-23 00:10:19 -070024#include <linux/posix_acl_xattr.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#include "jfs_incore.h"
Dave Kleikamp4f4b4012005-09-01 09:02:43 -050026#include "jfs_txnmgr.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#include "jfs_xattr.h"
28#include "jfs_acl.h"
29
Christoph Hellwig4e34e712011-07-23 17:37:31 +020030struct posix_acl *jfs_get_acl(struct inode *inode, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -070031{
32 struct posix_acl *acl;
33 char *ea_name;
Linus Torvalds1da177e2005-04-16 15:20:36 -070034 int size;
35 char *value = NULL;
36
Al Viro073aaa12009-06-09 12:11:54 -040037 acl = get_cached_acl(inode, type);
38 if (acl != ACL_NOT_CACHED)
39 return acl;
40
Linus Torvalds1da177e2005-04-16 15:20:36 -070041 switch(type) {
42 case ACL_TYPE_ACCESS:
Christoph Hellwig9a59f452005-06-23 00:10:19 -070043 ea_name = POSIX_ACL_XATTR_ACCESS;
Linus Torvalds1da177e2005-04-16 15:20:36 -070044 break;
45 case ACL_TYPE_DEFAULT:
Christoph Hellwig9a59f452005-06-23 00:10:19 -070046 ea_name = POSIX_ACL_XATTR_DEFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -070047 break;
48 default:
49 return ERR_PTR(-EINVAL);
50 }
51
Linus Torvalds1da177e2005-04-16 15:20:36 -070052 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) {
Al Viro073aaa12009-06-09 12:11:54 -040062 if (size == -ENODATA)
Linus Torvalds1da177e2005-04-16 15:20:36 -070063 acl = NULL;
Al Viro073aaa12009-06-09 12:11:54 -040064 else
Linus Torvalds1da177e2005-04-16 15:20:36 -070065 acl = ERR_PTR(size);
66 } else {
Eric W. Biederman5f3a4a22012-09-10 20:17:44 -070067 acl = posix_acl_from_xattr(&init_user_ns, value, size);
Linus Torvalds1da177e2005-04-16 15:20:36 -070068 }
Jesper Juhl259692b2005-05-09 10:47:14 -050069 kfree(value);
Stefan Bader4a19fb12009-07-23 11:26:05 +020070 if (!IS_ERR(acl))
Al Viro073aaa12009-06-09 12:11:54 -040071 set_cached_acl(inode, type, acl);
Linus Torvalds1da177e2005-04-16 15:20:36 -070072 return acl;
73}
74
Christoph Hellwig2cc6a5a2013-12-20 05:16:51 -080075static int __jfs_set_acl(tid_t tid, struct inode *inode, int type,
Dave Kleikamp4f4b4012005-09-01 09:02:43 -050076 struct posix_acl *acl)
Linus Torvalds1da177e2005-04-16 15:20:36 -070077{
78 char *ea_name;
Linus Torvalds1da177e2005-04-16 15:20:36 -070079 int rc;
80 int size = 0;
81 char *value = NULL;
82
Christoph Hellwig2cc6a5a2013-12-20 05:16:51 -080083 switch (type) {
84 case ACL_TYPE_ACCESS:
85 ea_name = POSIX_ACL_XATTR_ACCESS;
86 rc = posix_acl_equiv_mode(acl, &inode->i_mode);
87 if (rc < 0)
88 return rc;
89 if (rc == 0)
90 acl = NULL;
91 break;
92 case ACL_TYPE_DEFAULT:
93 ea_name = POSIX_ACL_XATTR_DEFAULT;
94 break;
95 default:
96 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070097 }
Christoph Hellwig2cc6a5a2013-12-20 05:16:51 -080098
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 if (acl) {
Christoph Hellwig9a59f452005-06-23 00:10:19 -0700100 size = posix_acl_xattr_size(acl->a_count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101 value = kmalloc(size, GFP_KERNEL);
102 if (!value)
103 return -ENOMEM;
Eric W. Biederman5f3a4a22012-09-10 20:17:44 -0700104 rc = posix_acl_to_xattr(&init_user_ns, acl, value, size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 if (rc < 0)
106 goto out;
107 }
Dave Kleikamp4f4b4012005-09-01 09:02:43 -0500108 rc = __jfs_setxattr(tid, inode, ea_name, value, size, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109out:
Jesper Juhl259692b2005-05-09 10:47:14 -0500110 kfree(value);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111
Al Viro073aaa12009-06-09 12:11:54 -0400112 if (!rc)
113 set_cached_acl(inode, type, acl);
114
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 return rc;
116}
117
Christoph Hellwig2cc6a5a2013-12-20 05:16:51 -0800118int jfs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120 int rc;
Al Virobc26ab52011-07-23 00:18:02 -0400121 tid_t tid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122
Al Virobc26ab52011-07-23 00:18:02 -0400123 tid = txBegin(inode->i_sb, 0);
124 mutex_lock(&JFS_IP(inode)->commit_mutex);
Christoph Hellwig2cc6a5a2013-12-20 05:16:51 -0800125 rc = __jfs_set_acl(tid, inode, type, acl);
Al Virobc26ab52011-07-23 00:18:02 -0400126 if (!rc)
127 rc = txCommit(tid, 1, &inode, 0);
128 txEnd(tid);
129 mutex_unlock(&JFS_IP(inode)->commit_mutex);
Christoph Hellwig2cc6a5a2013-12-20 05:16:51 -0800130 return rc;
131}
Al Virobc26ab52011-07-23 00:18:02 -0400132
Christoph Hellwig2cc6a5a2013-12-20 05:16:51 -0800133int jfs_init_acl(tid_t tid, struct inode *inode, struct inode *dir)
134{
135 struct posix_acl *default_acl, *acl;
136 int rc = 0;
137
138 rc = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl);
139 if (rc)
140 return rc;
141
142 if (default_acl) {
143 rc = __jfs_set_acl(tid, inode, ACL_TYPE_DEFAULT, default_acl);
144 posix_acl_release(default_acl);
145 }
146
147 if (acl) {
148 if (!rc)
149 rc = __jfs_set_acl(tid, inode, ACL_TYPE_ACCESS, acl);
150 posix_acl_release(acl);
151 }
152
153 JFS_IP(inode)->mode2 = (JFS_IP(inode)->mode2 & 0xffff0000) |
154 inode->i_mode;
155
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 return rc;
157}