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Josef Bacik5103e942007-11-16 11:45:54 -05001/*
2 * Copyright (C) 2007 Red Hat. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
17 */
18
19#include <linux/fs.h>
20#include <linux/string.h>
21#include <linux/xattr.h>
22#include <linux/posix_acl_xattr.h>
Josef Bacik33268ea2008-07-24 12:16:36 -040023#include <linux/posix_acl.h>
Chris Masonc1e32da2008-01-22 12:46:56 -050024#include <linux/sched.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090025#include <linux/slab.h>
Josef Bacik33268ea2008-07-24 12:16:36 -040026
Josef Bacik5103e942007-11-16 11:45:54 -050027#include "ctree.h"
Josef Bacik33268ea2008-07-24 12:16:36 -040028#include "btrfs_inode.h"
Josef Bacik5103e942007-11-16 11:45:54 -050029#include "xattr.h"
Josef Bacik33268ea2008-07-24 12:16:36 -040030
Christoph Hellwig4e34e712011-07-23 17:37:31 +020031struct posix_acl *btrfs_get_acl(struct inode *inode, int type)
Josef Bacik33268ea2008-07-24 12:16:36 -040032{
Christoph Hellwig95819c02008-08-28 06:21:17 -040033 int size;
34 const char *name;
Josef Bacik33268ea2008-07-24 12:16:36 -040035 char *value = NULL;
Al Viro073aaa12009-06-09 12:11:54 -040036 struct posix_acl *acl;
37
Josef Bacik33268ea2008-07-24 12:16:36 -040038 switch (type) {
39 case ACL_TYPE_ACCESS:
Andreas Gruenbacher97d79292015-12-02 14:44:35 +010040 name = XATTR_NAME_POSIX_ACL_ACCESS;
Josef Bacik33268ea2008-07-24 12:16:36 -040041 break;
42 case ACL_TYPE_DEFAULT:
Andreas Gruenbacher97d79292015-12-02 14:44:35 +010043 name = XATTR_NAME_POSIX_ACL_DEFAULT;
Josef Bacik33268ea2008-07-24 12:16:36 -040044 break;
45 default:
Al Viro073aaa12009-06-09 12:11:54 -040046 BUG();
Josef Bacik33268ea2008-07-24 12:16:36 -040047 }
48
Christoph Hellwig95819c02008-08-28 06:21:17 -040049 size = __btrfs_getxattr(inode, name, "", 0);
Josef Bacik33268ea2008-07-24 12:16:36 -040050 if (size > 0) {
David Sterba39a27ec2015-12-03 12:49:48 +010051 value = kzalloc(size, GFP_KERNEL);
Josef Bacik33268ea2008-07-24 12:16:36 -040052 if (!value)
53 return ERR_PTR(-ENOMEM);
Christoph Hellwig95819c02008-08-28 06:21:17 -040054 size = __btrfs_getxattr(inode, name, value, size);
Tsutomu Itohcfbffc32011-10-06 13:37:08 +090055 }
56 if (size > 0) {
Eric W. Biederman5f3a4a22012-09-10 20:17:44 -070057 acl = posix_acl_from_xattr(&init_user_ns, value, size);
Chris Mason7b1a14b2009-04-27 10:49:53 -040058 } else if (size == -ENOENT || size == -ENODATA || size == 0) {
59 /* FIXME, who returns -ENOENT? I think nobody */
Josef Bacik33268ea2008-07-24 12:16:36 -040060 acl = NULL;
Chris Mason7b1a14b2009-04-27 10:49:53 -040061 } else {
62 acl = ERR_PTR(-EIO);
Josef Bacik33268ea2008-07-24 12:16:36 -040063 }
Tsutomu Itohcfbffc32011-10-06 13:37:08 +090064 kfree(value);
65
66 if (!IS_ERR(acl))
67 set_cached_acl(inode, type, acl);
Josef Bacik33268ea2008-07-24 12:16:36 -040068
69 return acl;
70}
71
Josef Bacik33268ea2008-07-24 12:16:36 -040072/*
73 * Needs to be called with fs_mutex held
74 */
Christoph Hellwig996a7102013-12-20 05:16:43 -080075static int __btrfs_set_acl(struct btrfs_trans_handle *trans,
Yan, Zhengf34f57a2009-11-12 09:35:27 +000076 struct inode *inode, struct posix_acl *acl, int type)
Josef Bacik33268ea2008-07-24 12:16:36 -040077{
Christoph Hellwig95819c02008-08-28 06:21:17 -040078 int ret, size = 0;
79 const char *name;
Josef Bacik33268ea2008-07-24 12:16:36 -040080 char *value = NULL;
Josef Bacik33268ea2008-07-24 12:16:36 -040081
Josef Bacik33268ea2008-07-24 12:16:36 -040082 switch (type) {
83 case ACL_TYPE_ACCESS:
Andreas Gruenbacher97d79292015-12-02 14:44:35 +010084 name = XATTR_NAME_POSIX_ACL_ACCESS;
Chris Masona9cc71a2010-01-17 20:36:18 -050085 if (acl) {
Al Virod6952122011-07-23 18:56:36 -040086 ret = posix_acl_equiv_mode(acl, &inode->i_mode);
Chris Masona9cc71a2010-01-17 20:36:18 -050087 if (ret < 0)
88 return ret;
Liu Bo755ac672012-11-28 10:43:11 +000089 if (ret == 0)
90 acl = NULL;
Chris Masona9cc71a2010-01-17 20:36:18 -050091 }
92 ret = 0;
Josef Bacik33268ea2008-07-24 12:16:36 -040093 break;
94 case ACL_TYPE_DEFAULT:
95 if (!S_ISDIR(inode->i_mode))
96 return acl ? -EINVAL : 0;
Andreas Gruenbacher97d79292015-12-02 14:44:35 +010097 name = XATTR_NAME_POSIX_ACL_DEFAULT;
Josef Bacik33268ea2008-07-24 12:16:36 -040098 break;
99 default:
100 return -EINVAL;
101 }
102
103 if (acl) {
104 size = posix_acl_xattr_size(acl->a_count);
David Sterba39a27ec2015-12-03 12:49:48 +0100105 value = kmalloc(size, GFP_KERNEL);
Josef Bacik33268ea2008-07-24 12:16:36 -0400106 if (!value) {
107 ret = -ENOMEM;
108 goto out;
109 }
110
Eric W. Biederman5f3a4a22012-09-10 20:17:44 -0700111 ret = posix_acl_to_xattr(&init_user_ns, acl, value, size);
Josef Bacik33268ea2008-07-24 12:16:36 -0400112 if (ret < 0)
113 goto out;
114 }
115
Yan, Zhengf34f57a2009-11-12 09:35:27 +0000116 ret = __btrfs_setxattr(trans, inode, name, value, size, 0);
Josef Bacik33268ea2008-07-24 12:16:36 -0400117out:
Chris Masond3977122009-01-05 21:25:51 -0500118 kfree(value);
Josef Bacik33268ea2008-07-24 12:16:36 -0400119
120 if (!ret)
Al Viro073aaa12009-06-09 12:11:54 -0400121 set_cached_acl(inode, type, acl);
Josef Bacik33268ea2008-07-24 12:16:36 -0400122
123 return ret;
124}
Yanfb4bc1e2008-01-17 11:59:51 -0500125
Christoph Hellwig996a7102013-12-20 05:16:43 -0800126int btrfs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
Yan744f52f2008-01-14 13:26:08 -0500127{
Christoph Hellwig996a7102013-12-20 05:16:43 -0800128 return __btrfs_set_acl(NULL, inode, acl, type);
Yan744f52f2008-01-14 13:26:08 -0500129}
Josef Bacik1caf9342007-11-19 10:18:17 -0500130
Josef Bacik33268ea2008-07-24 12:16:36 -0400131/*
132 * btrfs_init_acl is already generally called under fs_mutex, so the locking
133 * stuff has been fixed to work with that. If the locking stuff changes, we
134 * need to re-evaluate the acl locking stuff.
135 */
Yan, Zhengf34f57a2009-11-12 09:35:27 +0000136int btrfs_init_acl(struct btrfs_trans_handle *trans,
137 struct inode *inode, struct inode *dir)
Josef Bacik33268ea2008-07-24 12:16:36 -0400138{
Christoph Hellwig996a7102013-12-20 05:16:43 -0800139 struct posix_acl *default_acl, *acl;
Josef Bacik33268ea2008-07-24 12:16:36 -0400140 int ret = 0;
141
142 /* this happens with subvols */
143 if (!dir)
144 return 0;
145
Christoph Hellwig996a7102013-12-20 05:16:43 -0800146 ret = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl);
Al Virobc26ab52011-07-23 00:18:02 -0400147 if (ret)
148 return ret;
Christoph Hellwig996a7102013-12-20 05:16:43 -0800149
150 if (default_acl) {
151 ret = __btrfs_set_acl(trans, inode, default_acl,
152 ACL_TYPE_DEFAULT);
153 posix_acl_release(default_acl);
154 }
155
156 if (acl) {
157 if (!ret)
158 ret = __btrfs_set_acl(trans, inode, acl,
159 ACL_TYPE_ACCESS);
160 posix_acl_release(acl);
161 }
162
163 if (!default_acl && !acl)
164 cache_no_acl(inode);
Josef Bacik33268ea2008-07-24 12:16:36 -0400165 return ret;
166}