linux/include/linux/xattr.h
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   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/* Namespaces */
  17#define XATTR_OS2_PREFIX "os2."
  18#define XATTR_OS2_PREFIX_LEN (sizeof (XATTR_OS2_PREFIX) - 1)
  19
  20#define XATTR_SECURITY_PREFIX   "security."
  21#define XATTR_SECURITY_PREFIX_LEN (sizeof (XATTR_SECURITY_PREFIX) - 1)
  22
  23#define XATTR_SYSTEM_PREFIX "system."
  24#define XATTR_SYSTEM_PREFIX_LEN (sizeof (XATTR_SYSTEM_PREFIX) - 1)
  25
  26#define XATTR_TRUSTED_PREFIX "trusted."
  27#define XATTR_TRUSTED_PREFIX_LEN (sizeof (XATTR_TRUSTED_PREFIX) - 1)
  28
  29#define XATTR_USER_PREFIX "user."
  30#define XATTR_USER_PREFIX_LEN (sizeof (XATTR_USER_PREFIX) - 1)
  31
  32/* Security namespace */
  33#define XATTR_EVM_SUFFIX "evm"
  34#define XATTR_NAME_EVM XATTR_SECURITY_PREFIX XATTR_EVM_SUFFIX
  35
  36#define XATTR_SELINUX_SUFFIX "selinux"
  37#define XATTR_NAME_SELINUX XATTR_SECURITY_PREFIX XATTR_SELINUX_SUFFIX
  38
  39#define XATTR_SMACK_SUFFIX "SMACK64"
  40#define XATTR_SMACK_IPIN "SMACK64IPIN"
  41#define XATTR_SMACK_IPOUT "SMACK64IPOUT"
  42#define XATTR_SMACK_EXEC "SMACK64EXEC"
  43#define XATTR_SMACK_TRANSMUTE "SMACK64TRANSMUTE"
  44#define XATTR_SMACK_MMAP "SMACK64MMAP"
  45#define XATTR_NAME_SMACK XATTR_SECURITY_PREFIX XATTR_SMACK_SUFFIX
  46#define XATTR_NAME_SMACKIPIN    XATTR_SECURITY_PREFIX XATTR_SMACK_IPIN
  47#define XATTR_NAME_SMACKIPOUT   XATTR_SECURITY_PREFIX XATTR_SMACK_IPOUT
  48#define XATTR_NAME_SMACKEXEC    XATTR_SECURITY_PREFIX XATTR_SMACK_EXEC
  49#define XATTR_NAME_SMACKTRANSMUTE XATTR_SECURITY_PREFIX XATTR_SMACK_TRANSMUTE
  50#define XATTR_NAME_SMACKMMAP XATTR_SECURITY_PREFIX XATTR_SMACK_MMAP
  51
  52#define XATTR_CAPS_SUFFIX "capability"
  53#define XATTR_NAME_CAPS XATTR_SECURITY_PREFIX XATTR_CAPS_SUFFIX
  54
  55#define XATTR_POSIX_ACL_ACCESS  "posix_acl_access"
  56#define XATTR_NAME_POSIX_ACL_ACCESS XATTR_SYSTEM_PREFIX XATTR_POSIX_ACL_ACCESS
  57#define XATTR_POSIX_ACL_DEFAULT  "posix_acl_default"
  58#define XATTR_NAME_POSIX_ACL_DEFAULT XATTR_SYSTEM_PREFIX XATTR_POSIX_ACL_DEFAULT
  59
  60#ifdef  __KERNEL__
  61
  62#include <linux/types.h>
  63
  64struct inode;
  65struct dentry;
  66
  67struct xattr_handler {
  68        const char *prefix;
  69        int flags;      /* fs private flags passed back to the handlers */
  70        size_t (*list)(struct dentry *dentry, char *list, size_t list_size,
  71                       const char *name, size_t name_len, int handler_flags);
  72        int (*get)(struct dentry *dentry, const char *name, void *buffer,
  73                   size_t size, int handler_flags);
  74        int (*set)(struct dentry *dentry, const char *name, const void *buffer,
  75                   size_t size, int flags, int handler_flags);
  76};
  77
  78struct xattr {
  79        char *name;
  80        void *value;
  81        size_t value_len;
  82};
  83
  84ssize_t xattr_getsecurity(struct inode *, const char *, void *, size_t);
  85ssize_t vfs_getxattr(struct dentry *, const char *, void *, size_t);
  86ssize_t vfs_listxattr(struct dentry *d, char *list, size_t size);
  87int __vfs_setxattr_noperm(struct dentry *, const char *, const void *, size_t, int);
  88int vfs_setxattr(struct dentry *, const char *, const void *, size_t, int);
  89int vfs_removexattr(struct dentry *, const char *);
  90
  91ssize_t generic_getxattr(struct dentry *dentry, const char *name, void *buffer, size_t size);
  92ssize_t generic_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size);
  93int generic_setxattr(struct dentry *dentry, const char *name, const void *value, size_t size, int flags);
  94int generic_removexattr(struct dentry *dentry, const char *name);
  95ssize_t vfs_getxattr_alloc(struct dentry *dentry, const char *name,
  96                           char **xattr_value, size_t size, gfp_t flags);
  97int vfs_xattr_cmp(struct dentry *dentry, const char *xattr_name,
  98                  const char *value, size_t size, gfp_t flags);
  99#endif  /*  __KERNEL__  */
 100
 101#endif  /* _LINUX_XATTR_H */
 102
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