// SPDX-License-Identifier: GPL-2.0
  /*
   * 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 bool
  ext4_xattr_user_list(struct dentry *dentry)
  {
  	return test_opt(dentry->d_sb, XATTR_USER);
  }
  
  static int
  ext4_xattr_user_get(const struct xattr_handler *handler,
  		    struct dentry *unused, struct inode *inode,
  		    const char *name, void *buffer, size_t size)
  {
  	if (!test_opt(inode->i_sb, XATTR_USER))
  		return -EOPNOTSUPP;
  	return ext4_xattr_get(inode, EXT4_XATTR_INDEX_USER,
  			      name, buffer, size);
  }
  
  static int
  ext4_xattr_user_set(const struct xattr_handler *handler,
  		    struct dentry *unused, struct inode *inode,
  		    const char *name, const void *value,
  		    size_t size, int flags)
  {
  	if (!test_opt(inode->i_sb, XATTR_USER))
  		return -EOPNOTSUPP;
  	return ext4_xattr_set(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,
  };