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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 <uapi/linux/xattr.h>
 13 #include <linux/posix_acl.h>
 14 
 15 /* Supported ACL a_version fields */
 16 #define POSIX_ACL_XATTR_VERSION 0x0002
 17 
 18 /* An undefined entry e_id value */
 19 #define ACL_UNDEFINED_ID        (-1)
 20 
 21 typedef struct {
 22         __le16                  e_tag;
 23         __le16                  e_perm;
 24         __le32                  e_id;
 25 } posix_acl_xattr_entry;
 26 
 27 typedef struct {
 28         __le32                  a_version;
 29         posix_acl_xattr_entry   a_entries[0];
 30 } posix_acl_xattr_header;
 31 
 32 
 33 static inline size_t
 34 posix_acl_xattr_size(int count)
 35 {
 36         return (sizeof(posix_acl_xattr_header) +
 37                 (count * sizeof(posix_acl_xattr_entry)));
 38 }
 39 
 40 static inline int
 41 posix_acl_xattr_count(size_t size)
 42 {
 43         if (size < sizeof(posix_acl_xattr_header))
 44                 return -1;
 45         size -= sizeof(posix_acl_xattr_header);
 46         if (size % sizeof(posix_acl_xattr_entry))
 47                 return -1;
 48         return size / sizeof(posix_acl_xattr_entry);
 49 }
 50 
 51 #ifdef CONFIG_FS_POSIX_ACL
 52 void posix_acl_fix_xattr_from_user(void *value, size_t size);
 53 void posix_acl_fix_xattr_to_user(void *value, size_t size);
 54 #else
 55 static inline void posix_acl_fix_xattr_from_user(void *value, size_t size)
 56 {
 57 }
 58 static inline void posix_acl_fix_xattr_to_user(void *value, size_t size)
 59 {
 60 }
 61 #endif
 62 
 63 struct posix_acl *posix_acl_from_xattr(struct user_namespace *user_ns, 
 64                                        const void *value, size_t size);
 65 int posix_acl_to_xattr(struct user_namespace *user_ns,
 66                        const struct posix_acl *acl, void *buffer, size_t size);
 67 
 68 extern const struct xattr_handler posix_acl_access_xattr_handler;
 69 extern const struct xattr_handler posix_acl_default_xattr_handler;
 70 
 71 #endif  /* _POSIX_ACL_XATTR_H */
 72 

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