/*

   * linux/fs/ext4/xattr_user.c

   * Handler for extended user attributes.
   *
   * Copyright (C) 2001 by Andreas Gruenbacher, <a.gruenbacher@computer.org>
   */

  #include <linux/string.h>
  #include <linux/fs.h>

  #include "ext4_jbd2.h"
  #include "ext4.h"

  #include "xattr.h"

  static size_t

  ext4_xattr_user_list(struct dentry *dentry, char *list, size_t list_size,
  		     const char *name, size_t name_len, int type)

  {

  	const size_t prefix_len = XATTR_USER_PREFIX_LEN;

  	const size_t total_len = prefix_len + name_len + 1;

  	if (!test_opt(dentry->d_sb, XATTR_USER))

  		return 0;
  
  	if (list && total_len <= list_size) {
  		memcpy(list, XATTR_USER_PREFIX, prefix_len);
  		memcpy(list+prefix_len, name, name_len);
  		list[prefix_len + name_len] = '\0';
  	}
  	return total_len;
  }
  
  static int

  ext4_xattr_user_get(struct dentry *dentry, const char *name,
  		    void *buffer, size_t size, int type)

  {
  	if (strcmp(name, "") == 0)
  		return -EINVAL;

  	if (!test_opt(dentry->d_sb, XATTR_USER))

  		return -EOPNOTSUPP;

  	return ext4_xattr_get(dentry->d_inode, EXT4_XATTR_INDEX_USER,
  			      name, buffer, size);

  }
  
  static int

  ext4_xattr_user_set(struct dentry *dentry, const char *name,
  		    const void *value, size_t size, int flags, int type)

  {
  	if (strcmp(name, "") == 0)
  		return -EINVAL;

  	if (!test_opt(dentry->d_sb, XATTR_USER))

  		return -EOPNOTSUPP;

  	return ext4_xattr_set(dentry->d_inode, EXT4_XATTR_INDEX_USER,
  			      name, value, size, flags);

  }

  const struct xattr_handler ext4_xattr_user_handler = {

  	.prefix	= XATTR_USER_PREFIX,

  	.list	= ext4_xattr_user_list,
  	.get	= ext4_xattr_user_get,
  	.set	= ext4_xattr_user_set,

  };