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Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright (C) 2017-2018 HUAWEI, Inc.
4 * https://www.huawei.com/
5 */
6#ifndef __EROFS_XATTR_H
7#define __EROFS_XATTR_H
8
9#include "internal.h"
10#include <linux/posix_acl_xattr.h>
11#include <linux/xattr.h>
12
13#ifdef CONFIG_EROFS_FS_XATTR
14extern const struct xattr_handler erofs_xattr_user_handler;
15extern const struct xattr_handler erofs_xattr_trusted_handler;
16extern const struct xattr_handler erofs_xattr_security_handler;
17
18static inline const char *erofs_xattr_prefix(unsigned int idx,
19 struct dentry *dentry)
20{
21 const struct xattr_handler *handler = NULL;
22
23 static const struct xattr_handler * const xattr_handler_map[] = {
24 [EROFS_XATTR_INDEX_USER] = &erofs_xattr_user_handler,
25#ifdef CONFIG_EROFS_FS_POSIX_ACL
26 [EROFS_XATTR_INDEX_POSIX_ACL_ACCESS] = &nop_posix_acl_access,
27 [EROFS_XATTR_INDEX_POSIX_ACL_DEFAULT] = &nop_posix_acl_default,
28#endif
29 [EROFS_XATTR_INDEX_TRUSTED] = &erofs_xattr_trusted_handler,
30#ifdef CONFIG_EROFS_FS_SECURITY
31 [EROFS_XATTR_INDEX_SECURITY] = &erofs_xattr_security_handler,
32#endif
33 };
34
35 if (idx && idx < ARRAY_SIZE(xattr_handler_map))
36 handler = xattr_handler_map[idx];
37
38 if (!xattr_handler_can_list(handler, dentry))
39 return NULL;
40
41 return xattr_prefix(handler);
42}
43
44extern const struct xattr_handler * const erofs_xattr_handlers[];
45
46int erofs_xattr_prefixes_init(struct super_block *sb);
47void erofs_xattr_prefixes_cleanup(struct super_block *sb);
48int erofs_getxattr(struct inode *, int, const char *, void *, size_t);
49ssize_t erofs_listxattr(struct dentry *, char *, size_t);
50#else
51static inline int erofs_xattr_prefixes_init(struct super_block *sb) { return 0; }
52static inline void erofs_xattr_prefixes_cleanup(struct super_block *sb) {}
53static inline int erofs_getxattr(struct inode *inode, int index,
54 const char *name, void *buffer,
55 size_t buffer_size)
56{
57 return -EOPNOTSUPP;
58}
59
60#define erofs_listxattr (NULL)
61#define erofs_xattr_handlers (NULL)
62#endif /* !CONFIG_EROFS_FS_XATTR */
63
64#ifdef CONFIG_EROFS_FS_POSIX_ACL
65struct posix_acl *erofs_get_acl(struct inode *inode, int type, bool rcu);
66#else
67#define erofs_get_acl (NULL)
68#endif
69
70#endif