include/linux/xattr_acl.h

   1 /*
   2   File: linux/xattr_acl.h
   3
   4   (extended attribute representation of access control lists)
   5
   6   (C) 2000 Andreas Gruenbacher, <a.gruenbacher@computer.org>
   7 */
   8
   9 #ifndef _LINUX_XATTR_ACL_H
  10 #define _LINUX_XATTR_ACL_H
  11
  12 #include <linux/posix_acl.h>
  13
  14 #define XATTR_NAME_ACL_ACCESS   "system.posix_acl_access"
  15 #define XATTR_NAME_ACL_DEFAULT  "system.posix_acl_default"
  16
  17 #define XATTR_ACL_VERSION       0x0002
  18
  19 typedef struct {
  20         __u16           e_tag;
  21         __u16           e_perm;
  22         __u32           e_id;
  23 } xattr_acl_entry;
  24
  25 typedef struct {
  26         __u32           a_version;
  27         xattr_acl_entry a_entries[0];
  28 } xattr_acl_header;
  29
  30 static inline size_t xattr_acl_size(int count)
  31 {
  32         return sizeof(xattr_acl_header) + count * sizeof(xattr_acl_entry);
  33 }
  34
  35 static inline int xattr_acl_count(size_t size)
  36 {
  37         if (size < sizeof(xattr_acl_header))
  38                 return -1;
  39         size -= sizeof(xattr_acl_header);
  40         if (size % sizeof(xattr_acl_entry))
  41                 return -1;
  42         return size / sizeof(xattr_acl_entry);
  43 }
  44
  45 struct posix_acl * posix_acl_from_xattr(const void *value, size_t size);
  46 int posix_acl_to_xattr(const struct posix_acl *acl, void *buffer, size_t size);
  47
  48
  49
  50 #endif /* _LINUX_XATTR_ACL_H */