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/* SPDX-License-Identifier: GPL-2.0 */
/*
File: linux/posix_acl_xattr.h
Extended attribute system call representation of Access Control Lists.
Copyright (C) 2000 by Andreas Gruenbacher <a.gruenbacher@computer.org>
Copyright (C) 2002 SGI - Silicon Graphics, Inc <linux-xfs@oss.sgi.com>
*/
#ifndef _POSIX_ACL_XATTR_H
#define _POSIX_ACL_XATTR_H
#include <uapi/linux/xattr.h>
#include <uapi/linux/posix_acl_xattr.h>
#include <linux/posix_acl.h>
static inline size_t
posix_acl_xattr_size(int count)
{
return (sizeof(struct posix_acl_xattr_header) +
(count * sizeof(struct posix_acl_xattr_entry)));
}
static inline int
posix_acl_xattr_count(size_t size)
{
if (size < sizeof(struct posix_acl_xattr_header))
return -1;
size -= sizeof(struct posix_acl_xattr_header);
if (size % sizeof(struct posix_acl_xattr_entry))
return -1;
return size / sizeof(struct posix_acl_xattr_entry);
}
#ifdef CONFIG_FS_POSIX_ACL
void posix_acl_fix_xattr_from_user(void *value, size_t size);
void posix_acl_fix_xattr_to_user(void *value, size_t size);
void posix_acl_getxattr_idmapped_mnt(struct user_namespace *mnt_userns,
const struct inode *inode,
void *value, size_t size);
ssize_t vfs_posix_acl_to_xattr(struct user_namespace *mnt_userns,
struct inode *inode, const struct posix_acl *acl,
void *buffer, size_t size);
#else
static inline void posix_acl_fix_xattr_from_user(void *value, size_t size)
{
}
static inline void posix_acl_fix_xattr_to_user(void *value, size_t size)
{
}
static inline void
posix_acl_getxattr_idmapped_mnt(struct user_namespace *mnt_userns,
const struct inode *inode, void *value,
size_t size)
{
}
static inline ssize_t vfs_posix_acl_to_xattr(struct user_namespace *mnt_userns,
struct inode *inode,
const struct posix_acl *acl,
void *buffer, size_t size)
{
return 0;
}
#endif
struct posix_acl *posix_acl_from_xattr(struct user_namespace *user_ns,
const void *value, size_t size);
int posix_acl_to_xattr(struct user_namespace *user_ns,
const struct posix_acl *acl, void *buffer, size_t size);
struct posix_acl *vfs_set_acl_prepare(struct user_namespace *mnt_userns,
struct user_namespace *fs_userns,
const void *value, size_t size);
static inline const char *posix_acl_xattr_name(int type)
{
switch (type) {
case ACL_TYPE_ACCESS:
return XATTR_NAME_POSIX_ACL_ACCESS;
case ACL_TYPE_DEFAULT:
return XATTR_NAME_POSIX_ACL_DEFAULT;
}
return "";
}
static inline int posix_acl_type(const char *name)
{
if (strcmp(name, XATTR_NAME_POSIX_ACL_ACCESS) == 0)
return ACL_TYPE_ACCESS;
else if (strcmp(name, XATTR_NAME_POSIX_ACL_DEFAULT) == 0)
return ACL_TYPE_DEFAULT;
return -1;
}
extern const struct xattr_handler posix_acl_access_xattr_handler;
extern const struct xattr_handler posix_acl_default_xattr_handler;
#endif /* _POSIX_ACL_XATTR_H */
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