include/linux/xattr.h

   1 /*
   2   File: linux/xattr.h
   3
   4   Extended attributes handling.
   5
   6   Copyright (C) 2001 by Andreas Gruenbacher <a.gruenbacher@computer.org>
   7   Copyright (c) 2001-2002 Silicon Graphics, Inc.  All Rights Reserved.
   8   Copyright (c) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
   9 */
  10 #ifndef _LINUX_XATTR_H
  11 #define _LINUX_XATTR_H
  12
  13 #define XATTR_CREATE    0x1     /* set value, fail if attr already exists */
  14 #define XATTR_REPLACE   0x2     /* set value, fail if attr does not exist */
  15
  16 #ifdef  __KERNEL__
  17
  18 #include <linux/types.h>
  19
  20 /* Namespaces */
  21 #define XATTR_OS2_PREFIX "os2."
  22 #define XATTR_OS2_PREFIX_LEN (sizeof (XATTR_OS2_PREFIX) - 1)
  23
  24 #define XATTR_SECURITY_PREFIX   "security."
  25 #define XATTR_SECURITY_PREFIX_LEN (sizeof (XATTR_SECURITY_PREFIX) - 1)
  26
  27 #define XATTR_SYSTEM_PREFIX "system."
  28 #define XATTR_SYSTEM_PREFIX_LEN (sizeof (XATTR_SYSTEM_PREFIX) - 1)
  29
  30 #define XATTR_TRUSTED_PREFIX "trusted."
  31 #define XATTR_TRUSTED_PREFIX_LEN (sizeof (XATTR_TRUSTED_PREFIX) - 1)
  32
  33 #define XATTR_USER_PREFIX "user."
  34 #define XATTR_USER_PREFIX_LEN (sizeof (XATTR_USER_PREFIX) - 1)
  35
  36 struct inode;
  37 struct dentry;
  38
  39 struct xattr_handler {
  40         char *prefix;
  41         size_t (*list)(struct inode *inode, char *list, size_t list_size,
  42                        const char *name, size_t name_len);
  43         int (*get)(struct inode *inode, const char *name, void *buffer,
  44                    size_t size);
  45         int (*set)(struct inode *inode, const char *name, const void *buffer,
  46                    size_t size, int flags);
  47 };
  48
  49 ssize_t vfs_getxattr(struct dentry *, char *, void *, size_t);
  50 ssize_t vfs_listxattr(struct dentry *d, char *list, size_t size);
  51 int vfs_setxattr(struct dentry *, char *, void *, size_t, int);
  52 int vfs_removexattr(struct dentry *, char *);
  53
  54 ssize_t generic_getxattr(struct dentry *dentry, const char *name, void *buffer, size_t size);
  55 ssize_t generic_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size);
  56 int generic_setxattr(struct dentry *dentry, const char *name, const void *value, size_t size, int flags);
  57 int generic_removexattr(struct dentry *dentry, const char *name);
  58
  59 #endif  /*  __KERNEL__  */
  60
  61 #endif  /* _LINUX_XATTR_H */