Line data    Source code

       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         134 :         return (sizeof(struct posix_acl_xattr_header) +
      21         134 :                 (count * sizeof(struct posix_acl_xattr_entry)));
      22             : }
      23             : 
      24             : static inline int
      25             : posix_acl_xattr_count(size_t size)
      26             : {
      27     1857149 :         if (size < sizeof(struct posix_acl_xattr_header))
      28             :                 return -1;
      29     1857149 :         size -= sizeof(struct posix_acl_xattr_header);
      30     1857149 :         if (size % sizeof(struct posix_acl_xattr_entry))
      31             :                 return -1;
      32     1857149 :         return size / sizeof(struct posix_acl_xattr_entry);
      33             : }
      34             : 
      35             : #ifdef CONFIG_FS_POSIX_ACL
      36             : struct posix_acl *posix_acl_from_xattr(struct user_namespace *user_ns,
      37             :                                        const void *value, size_t size);
      38             : #else
      39             : static inline struct posix_acl *
      40             : posix_acl_from_xattr(struct user_namespace *user_ns, const void *value,
      41             :                      size_t size)
      42             : {
      43             :         return ERR_PTR(-EOPNOTSUPP);
      44             : }
      45             : #endif
      46             : 
      47             : int posix_acl_to_xattr(struct user_namespace *user_ns,
      48             :                        const struct posix_acl *acl, void *buffer, size_t size);
      49             : static inline const char *posix_acl_xattr_name(int type)
      50             : {
      51             :         switch (type) {
      52             :         case ACL_TYPE_ACCESS:
      53             :                 return XATTR_NAME_POSIX_ACL_ACCESS;
      54             :         case ACL_TYPE_DEFAULT:
      55             :                 return XATTR_NAME_POSIX_ACL_DEFAULT;
      56             :         }
      57             : 
      58             :         return "";
      59             : }
      60             : 
      61     3784507 : static inline int posix_acl_type(const char *name)
      62             : {
      63     3784507 :         if (strcmp(name, XATTR_NAME_POSIX_ACL_ACCESS) == 0)
      64             :                 return ACL_TYPE_ACCESS;
      65       44541 :         else if (strcmp(name, XATTR_NAME_POSIX_ACL_DEFAULT) == 0)
      66       44541 :                 return ACL_TYPE_DEFAULT;
      67             : 
      68             :         return -1;
      69             : }
      70             : 
      71             : /* These are legacy handlers. Don't use them for new code. */
      72             : extern const struct xattr_handler nop_posix_acl_access;
      73             : extern const struct xattr_handler nop_posix_acl_default;
      74             : 
      75             : #endif  /* _POSIX_ACL_XATTR_H */