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
ext4_xattr_user_list(struct dentry * dentry)16 ext4_xattr_user_list(struct dentry *dentry)
17 {
18 	return test_opt(dentry->d_sb, XATTR_USER);
19 }
20 
21 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)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
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)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 };
50