LXR linux/fs/ext4/xattr

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * linux/fs/ext4/xattr_user.c
   4 * Handler for extended user attributes.
   5 *
   6 * Copyright (C) 2001 by Andreas Gruenbacher, <a.gruenbacher@computer.org>
   7 */
   8
   9#include <linux/string.h>
  10#include <linux/fs.h>
  11#include "ext4_jbd2.h"
  12#include "ext4.h"
  13#include "xattr.h"
  14
  15static bool
  16ext4_xattr_user_list(struct dentry *dentry)
  17{
  18        return test_opt(dentry->d_sb, XATTR_USER);
  19}
  20
  21static int
  22ext4_xattr_user_get(const struct xattr_handler *handler,
  23                    struct dentry *unused, struct inode *inode,
  24                    const char *name, void *buffer, size_t size)
  25{
  26        if (!test_opt(inode->i_sb, XATTR_USER))
  27                return -EOPNOTSUPP;
  28        return ext4_xattr_get(inode, EXT4_XATTR_INDEX_USER,
  29                              name, buffer, size);
  30}
  31
  32static int
  33ext4_xattr_user_set(const struct xattr_handler *handler,
  34                    struct user_namespace *mnt_userns,
  35                    struct dentry *unused, struct inode *inode,
  36                    const char *name, const void *value,
  37                    size_t size, int flags)
  38{
  39        if (!test_opt(inode->i_sb, XATTR_USER))
  40                return -EOPNOTSUPP;
  41        return ext4_xattr_set(inode, EXT4_XATTR_INDEX_USER,
  42                              name, value, size, flags);
  43}
  44
  45const struct xattr_handler ext4_xattr_user_handler = {
  46        .prefix = XATTR_USER_PREFIX,
  47        .list   = ext4_xattr_user_list,
  48        .get    = ext4_xattr_user_get,
  49        .set    = ext4_xattr_user_set,
  50};
  51