#include <linux/reiserfs_fs.h>

  #include <linux/capability.h>

  #include <linux/errno.h>
  #include <linux/fs.h>
  #include <linux/pagemap.h>
  #include <linux/xattr.h>
  #include <linux/reiserfs_xattr.h>
  #include <asm/uaccess.h>
  
  #define XATTR_TRUSTED_PREFIX "trusted."
  
  static int

  trusted_get(struct inode *inode, const char *name, void *buffer, size_t size)

  {

  	if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX))
  		return -EINVAL;

  	if (!reiserfs_xattrs(inode->i_sb))
  		return -EOPNOTSUPP;

  	if (!(capable(CAP_SYS_ADMIN) || is_reiserfs_priv_object(inode)))
  		return -EPERM;

  	return reiserfs_xattr_get(inode, name, buffer, size);

  }
  
  static int

  trusted_set(struct inode *inode, const char *name, const void *buffer,
  	    size_t size, int flags)

  {

  	if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX))
  		return -EINVAL;

  	if (!reiserfs_xattrs(inode->i_sb))
  		return -EOPNOTSUPP;

  	if (!(capable(CAP_SYS_ADMIN) || is_reiserfs_priv_object(inode)))
  		return -EPERM;

  	return reiserfs_xattr_set(inode, name, buffer, size, flags);

  }

  static int trusted_del(struct inode *inode, const char *name)

  {

  	if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX))
  		return -EINVAL;

  	if (!reiserfs_xattrs(inode->i_sb))
  		return -EOPNOTSUPP;

  	if (!(capable(CAP_SYS_ADMIN) || is_reiserfs_priv_object(inode)))
  		return -EPERM;

  	return 0;

  }
  
  static int

  trusted_list(struct inode *inode, const char *name, int namelen, char *out)

  {

  	int len = namelen;

  	if (!reiserfs_xattrs(inode->i_sb))
  		return 0;

  	if (!(capable(CAP_SYS_ADMIN) || is_reiserfs_priv_object(inode)))
  		return 0;

  	if (out)
  		memcpy(out, name, len);

  	return len;

  }

  struct reiserfs_xattr_handler trusted_handler = {
  	.prefix = XATTR_TRUSTED_PREFIX,
  	.get = trusted_get,
  	.set = trusted_set,
  	.del = trusted_del,
  	.list = trusted_list,
  };