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 /* Attribute not found */
14 #define ENOATTR ENODATA
15
16 #ifdef CONFIG_EROFS_FS_XATTR
17 extern const struct xattr_handler erofs_xattr_user_handler;
18 extern const struct xattr_handler erofs_xattr_trusted_handler;
19 extern const struct xattr_handler erofs_xattr_security_handler;
20
21 static inline const char *erofs_xattr_prefix(unsigned int idx,
22 struct dentry *dentry)
23 {
24 const struct xattr_handler *handler = NULL;
25
26 static const struct xattr_handler * const xattr_handler_map[] = {
27 [EROFS_XATTR_INDEX_USER] = &erofs_xattr_user_handler,
28 #ifdef CONFIG_EROFS_FS_POSIX_ACL
29 [EROFS_XATTR_INDEX_POSIX_ACL_ACCESS] = &nop_posix_acl_access,
30 [EROFS_XATTR_INDEX_POSIX_ACL_DEFAULT] = &nop_posix_acl_default,
31 #endif
32 [EROFS_XATTR_INDEX_TRUSTED] = &erofs_xattr_trusted_handler,
33 #ifdef CONFIG_EROFS_FS_SECURITY
34 [EROFS_XATTR_INDEX_SECURITY] = &erofs_xattr_security_handler,
35 #endif
36 };
37
38 if (idx && idx < ARRAY_SIZE(xattr_handler_map))
39 handler = xattr_handler_map[idx];
40
41 if (!xattr_handler_can_list(handler, dentry))
42 return NULL;
43
44 return xattr_prefix(handler);
45 }
46
47 extern const struct xattr_handler * const erofs_xattr_handlers[];
48
49 int erofs_xattr_prefixes_init(struct super_block *sb);
50 void erofs_xattr_prefixes_cleanup(struct super_block *sb);
51 int erofs_getxattr(struct inode *, int, const char *, void *, size_t);
52 ssize_t erofs_listxattr(struct dentry *, char *, size_t);
53 #else
54 static inline int erofs_xattr_prefixes_init(struct super_block *sb) { return 0; }
55 static inline void erofs_xattr_prefixes_cleanup(struct super_block *sb) {}
56 static inline int erofs_getxattr(struct inode *inode, int index,
57 const char *name, void *buffer,
58 size_t buffer_size)
59 {
60 return -EOPNOTSUPP;
61 }
62
63 #define erofs_listxattr (NULL)
64 #define erofs_xattr_handlers (NULL)
65 #endif /* !CONFIG_EROFS_FS_XATTR */
66
67 #ifdef CONFIG_EROFS_FS_POSIX_ACL
68 struct posix_acl *erofs_get_acl(struct inode *inode, int type, bool rcu);
69 #else
70 #define erofs_get_acl (NULL)
71 #endif
72
73 #endif
74
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