/*
* Copyright (C) 2007 Red Hat. All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License v2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 021110-1307, USA.
*/
#include <linux/fs.h>
#include <linux/string.h>
#include <linux/xattr.h>
#include <linux/posix_acl_xattr.h>
#include <linux/sched.h>
#include "ctree.h"
#include "xattr.h"
#ifndef is_owner_or_cap
#define is_owner_or_cap(inode) \
((current->fsuid == (inode)->i_uid) || capable(CAP_FOWNER))
#endif
static int btrfs_xattr_set_acl(struct inode *inode, int type,
const void *value, size_t size)
{
int ret = 0;
struct posix_acl *acl;
if (!is_owner_or_cap(inode))
return -EPERM;
if (value) {
acl = posix_acl_from_xattr(value, size);
if (acl == NULL) {
value = NULL;
size = 0;
} else if (IS_ERR(acl)) {
ret = PTR_ERR(acl);
} else {
ret = posix_acl_valid(acl);
posix_acl_release(acl);
}
if (ret)
return ret;
}
return btrfs_xattr_set(inode, type, "", value, size, 0);
}
static int btrfs_xattr_get_acl(struct inode *inode, int type,
void *value, size_t size)
{
return btrfs_xattr_get(inode, type, "", value, size);
}
static int btrfs_xattr_acl_access_get(struct inode *inode, const char *name,
void *value, size_t size)
{
if (*name != '\0')
return -EINVAL;
return btrfs_xattr_get_acl(inode, BTRFS_XATTR_INDEX_POSIX_ACL_ACCESS,
value, size);
}
static int btrfs_xattr_acl_access_set(struct inode *inode, const char *name,
const void *value, size_t size, int flags)
{
if (*name != '\0')
return -EINVAL;
return btrfs_xattr_set_acl(inode, BTRFS_XATTR_INDEX_POSIX_ACL_ACCESS,
value, size);
}
static int btrfs_xattr_acl_default_get(struct inode *inode, const char *name,
void *value, size_t size)
{
if (*name != '\0')
return -EINVAL;
return btrfs_xattr_get_acl(inode, BTRFS_XATTR_INDEX_POSIX_ACL_DEFAULT,
value, size);
}
static int btrfs_xattr_acl_default_set(struct inode *inode, const char *name,
const void *value, size_t size, int flags)
{
if (*name != '\0')
return -EINVAL;
return btrfs_xattr_set_acl(inode, BTRFS_XATTR_INDEX_POSIX_ACL_DEFAULT,
value, size);
}
struct xattr_handler btrfs_xattr_acl_default_handler = {
.prefix = POSIX_ACL_XATTR_DEFAULT,
.list = btrfs_xattr_generic_list,
.get = btrfs_xattr_acl_default_get,
.set = btrfs_xattr_acl_default_set,
};
struct xattr_handler btrfs_xattr_acl_access_handler = {
.prefix = POSIX_ACL_XATTR_ACCESS,
.list = btrfs_xattr_generic_list,
.get = btrfs_xattr_acl_access_get,
.set = btrfs_xattr_acl_access_set,
};
