fs/ext4/xattr_user.c

   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
  15 static bool
  16 ext4_xattr_user_list(struct dentry *dentry)
  17 {
  18         return test_opt(dentry->d_sb, XATTR_USER);
  19 }
  20
  21 static int
  22 ext4_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
  32 static int
  33 ext4_xattr_user_set(const struct xattr_handler *handler,
  34                     struct dentry *unused, struct inode *inode,
  35                     const char *name, const void *value,
  36                     size_t size, int flags)
  37 {
  38         if (!test_opt(inode->i_sb, XATTR_USER))
  39                 return -EOPNOTSUPP;
  40         return ext4_xattr_set(inode, EXT4_XATTR_INDEX_USER,
  41                               name, value, size, flags);
  42 }
  43
  44 const struct xattr_handler ext4_xattr_user_handler = {
  45         .prefix = XATTR_USER_PREFIX,
  46         .list   = ext4_xattr_user_list,
  47         .get    = ext4_xattr_user_get,
  48         .set    = ext4_xattr_user_set,
  49 };