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Linux/include/linux/posix_acl_xattr.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 /*
  3   File: linux/posix_acl_xattr.h
  4 
  5   Extended attribute system call representation of Access Control Lists.
  6 
  7   Copyright (C) 2000 by Andreas Gruenbacher <a.gruenbacher@computer.org>
  8   Copyright (C) 2002 SGI - Silicon Graphics, Inc <linux-xfs@oss.sgi.com>
  9  */
 10 #ifndef _POSIX_ACL_XATTR_H
 11 #define _POSIX_ACL_XATTR_H
 12 
 13 #include <uapi/linux/xattr.h>
 14 #include <uapi/linux/posix_acl_xattr.h>
 15 #include <linux/posix_acl.h>
 16 
 17 static inline size_t
 18 posix_acl_xattr_size(int count)
 19 {
 20         return (sizeof(struct posix_acl_xattr_header) +
 21                 (count * sizeof(struct posix_acl_xattr_entry)));
 22 }
 23 
 24 static inline int
 25 posix_acl_xattr_count(size_t size)
 26 {
 27         if (size < sizeof(struct posix_acl_xattr_header))
 28                 return -1;
 29         size -= sizeof(struct posix_acl_xattr_header);
 30         if (size % sizeof(struct posix_acl_xattr_entry))
 31                 return -1;
 32         return size / sizeof(struct posix_acl_xattr_entry);
 33 }
 34 
 35 #ifdef CONFIG_FS_POSIX_ACL
 36 void posix_acl_fix_xattr_from_user(void *value, size_t size);
 37 void posix_acl_fix_xattr_to_user(void *value, size_t size);
 38 #else
 39 static inline void posix_acl_fix_xattr_from_user(void *value, size_t size)
 40 {
 41 }
 42 static inline void posix_acl_fix_xattr_to_user(void *value, size_t size)
 43 {
 44 }
 45 #endif
 46 
 47 struct posix_acl *posix_acl_from_xattr(struct user_namespace *user_ns, 
 48                                        const void *value, size_t size);
 49 int posix_acl_to_xattr(struct user_namespace *user_ns,
 50                        const struct posix_acl *acl, void *buffer, size_t size);
 51 
 52 extern const struct xattr_handler posix_acl_access_xattr_handler;
 53 extern const struct xattr_handler posix_acl_default_xattr_handler;
 54 
 55 #endif  /* _POSIX_ACL_XATTR_H */
 56 

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