| /* 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(struct user_namespace *mnt_userns, |
| void *value, size_t size); |
| void posix_acl_fix_xattr_to_user(struct user_namespace *mnt_userns, |
| void *value, size_t size); |
| #else |
| static inline void posix_acl_fix_xattr_from_user(struct user_namespace *mnt_userns, |
| void *value, size_t size) |
| { |
| } |
| static inline void posix_acl_fix_xattr_to_user(struct user_namespace *mnt_userns, |
| void *value, size_t size) |
| { |
| } |
| #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); |
| |
| 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 */ |