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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
*
* xattr.c: exFAT code for supporting xattr(Extended File Attributes)
*/
#include "config.h"
#ifdef CONFIG_EXFAT_VIRTUAL_XATTR
#include <linux/file.h>
#include <linux/fs.h>
#include <linux/xattr.h>
#include <linux/dcache.h>
#include "exfat.h"
#ifndef CONFIG_EXFAT_VIRTUAL_XATTR_SELINUX_LABEL
#define CONFIG_EXFAT_VIRTUAL_XATTR_SELINUX_LABEL ("undefined")
#endif
static const char default_xattr[] = CONFIG_EXFAT_VIRTUAL_XATTR_SELINUX_LABEL;
static int can_support(const char *name)
{
if (!name || strcmp(name, "security.selinux"))
return -1;
return 0;
}
ssize_t exfat_listxattr(struct dentry *dentry, char *list, size_t size)
{
return 0;
}
static int __exfat_xattr_check_support(const char *name)
{
if (can_support(name))
return -EOPNOTSUPP;
return 0;
}
ssize_t __exfat_getxattr(const char *name, void *value, size_t size)
{
if (can_support(name))
return -EOPNOTSUPP;
if ((size > strlen(default_xattr)+1) && value)
strcpy(value, default_xattr);
return strlen(default_xattr);
}
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 9, 0)
static int exfat_xattr_get(const struct xattr_handler *handler,
struct dentry *dentry, struct inode *inode,
const char *name, void *buffer, size_t size)
{
return __exfat_getxattr(name, buffer, size);
}
static int exfat_xattr_set(const struct xattr_handler *handler,
struct dentry *dentry, struct inode *inode,
const char *name, const void *value, size_t size,
int flags)
{
return __exfat_xattr_check_support(name);
}
const struct xattr_handler exfat_xattr_handler = {
.prefix = "", /* match anything */
.get = exfat_xattr_get,
.set = exfat_xattr_set,
};
const struct xattr_handler *exfat_xattr_handlers[] = {
&exfat_xattr_handler,
NULL
};
void setup_exfat_xattr_handler(struct super_block *sb)
{
sb->s_xattr = exfat_xattr_handlers;
}
#else /* LINUX_VERSION_CODE < KERNEL_VERSION(4, 9, 0) */
int exfat_setxattr(struct dentry *dentry, const char *name, const void *value, size_t size, int flags)
{
return __exfat_xattr_check_support(name);
}
ssize_t exfat_getxattr(struct dentry *dentry, const char *name, void *value, size_t size)
{
return __exfat_getxattr(name, value, size);
}
int exfat_removexattr(struct dentry *dentry, const char *name)
{
return __exfat_xattr_check_support(name);
}
void setup_exfat_xattr_handler(struct super_block *sb)
{
/* DO NOTHING */
}
#endif
#endif /* CONFIG_EXFAT_VIRTUAL_XATTR */
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