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Linux/include/linux/posix_acl_xattr.h

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  1 /*
  2   File: linux/posix_acl_xattr.h
  3 
  4   Extended attribute system call representation of Access Control Lists.
  5 
  6   Copyright (C) 2000 by Andreas Gruenbacher <a.gruenbacher@computer.org>
  7   Copyright (C) 2002 SGI - Silicon Graphics, Inc <linux-xfs@oss.sgi.com>
  8  */
  9 #ifndef _POSIX_ACL_XATTR_H
 10 #define _POSIX_ACL_XATTR_H
 11 
 12 #include <linux/posix_acl.h>
 13 
 14 /* Extended attribute names */
 15 #define POSIX_ACL_XATTR_ACCESS  "system.posix_acl_access"
 16 #define POSIX_ACL_XATTR_DEFAULT "system.posix_acl_default"
 17 
 18 /* Supported ACL a_version fields */
 19 #define POSIX_ACL_XATTR_VERSION 0x0002
 20 
 21 
 22 /* An undefined entry e_id value */
 23 #define ACL_UNDEFINED_ID        (-1)
 24 
 25 typedef struct {
 26         __le16                  e_tag;
 27         __le16                  e_perm;
 28         __le32                  e_id;
 29 } posix_acl_xattr_entry;
 30 
 31 typedef struct {
 32         __le32                  a_version;
 33         posix_acl_xattr_entry   a_entries[0];
 34 } posix_acl_xattr_header;
 35 
 36 
 37 static inline size_t
 38 posix_acl_xattr_size(int count)
 39 {
 40         return (sizeof(posix_acl_xattr_header) +
 41                 (count * sizeof(posix_acl_xattr_entry)));
 42 }
 43 
 44 static inline int
 45 posix_acl_xattr_count(size_t size)
 46 {
 47         if (size < sizeof(posix_acl_xattr_header))
 48                 return -1;
 49         size -= sizeof(posix_acl_xattr_header);
 50         if (size % sizeof(posix_acl_xattr_entry))
 51                 return -1;
 52         return size / sizeof(posix_acl_xattr_entry);
 53 }
 54 
 55 #ifdef CONFIG_FS_POSIX_ACL
 56 void posix_acl_fix_xattr_from_user(void *value, size_t size);
 57 void posix_acl_fix_xattr_to_user(void *value, size_t size);
 58 #else
 59 static inline void posix_acl_fix_xattr_from_user(void *value, size_t size)
 60 {
 61 }
 62 static inline void posix_acl_fix_xattr_to_user(void *value, size_t size)
 63 {
 64 }
 65 #endif
 66 
 67 struct posix_acl *posix_acl_from_xattr(struct user_namespace *user_ns, 
 68                                        const void *value, size_t size);
 69 int posix_acl_to_xattr(struct user_namespace *user_ns,
 70                        const struct posix_acl *acl, void *buffer, size_t size);
 71 
 72 #endif  /* _POSIX_ACL_XATTR_H */
 73 

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