1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * Copyright (C) 2017-2018 HUAWEI, Inc.
4 * https://www.huawei.com/
5 * Created by Gao Xiang <gaoxiang25@huawei.com>
6 */
7 #ifndef __EROFS_XATTR_H
8 #define __EROFS_XATTR_H
9
10 #include "internal.h"
11 #include <linux/posix_acl_xattr.h>
12 #include <linux/xattr.h>
13
14 /* Attribute not found */
15 #define ENOATTR ENODATA
16
inlinexattr_header_size(struct inode * inode)17 static inline unsigned int inlinexattr_header_size(struct inode *inode)
18 {
19 return sizeof(struct erofs_xattr_ibody_header) +
20 sizeof(u32) * EROFS_I(inode)->xattr_shared_count;
21 }
22
xattrblock_addr(struct erofs_sb_info * sbi,unsigned int xattr_id)23 static inline erofs_blk_t xattrblock_addr(struct erofs_sb_info *sbi,
24 unsigned int xattr_id)
25 {
26 #ifdef CONFIG_EROFS_FS_XATTR
27 return sbi->xattr_blkaddr +
28 xattr_id * sizeof(__u32) / EROFS_BLKSIZ;
29 #else
30 return 0;
31 #endif
32 }
33
xattrblock_offset(struct erofs_sb_info * sbi,unsigned int xattr_id)34 static inline unsigned int xattrblock_offset(struct erofs_sb_info *sbi,
35 unsigned int xattr_id)
36 {
37 return (xattr_id * sizeof(__u32)) % EROFS_BLKSIZ;
38 }
39
40 #ifdef CONFIG_EROFS_FS_XATTR
41 extern const struct xattr_handler erofs_xattr_user_handler;
42 extern const struct xattr_handler erofs_xattr_trusted_handler;
43 #ifdef CONFIG_EROFS_FS_SECURITY
44 extern const struct xattr_handler erofs_xattr_security_handler;
45 #endif
46
erofs_xattr_handler(unsigned int idx)47 static inline const struct xattr_handler *erofs_xattr_handler(unsigned int idx)
48 {
49 static const struct xattr_handler *xattr_handler_map[] = {
50 [EROFS_XATTR_INDEX_USER] = &erofs_xattr_user_handler,
51 #ifdef CONFIG_EROFS_FS_POSIX_ACL
52 [EROFS_XATTR_INDEX_POSIX_ACL_ACCESS] =
53 &posix_acl_access_xattr_handler,
54 [EROFS_XATTR_INDEX_POSIX_ACL_DEFAULT] =
55 &posix_acl_default_xattr_handler,
56 #endif
57 [EROFS_XATTR_INDEX_TRUSTED] = &erofs_xattr_trusted_handler,
58 #ifdef CONFIG_EROFS_FS_SECURITY
59 [EROFS_XATTR_INDEX_SECURITY] = &erofs_xattr_security_handler,
60 #endif
61 };
62
63 return idx && idx < ARRAY_SIZE(xattr_handler_map) ?
64 xattr_handler_map[idx] : NULL;
65 }
66
67 extern const struct xattr_handler *erofs_xattr_handlers[];
68
69 int erofs_getxattr(struct inode *, int, const char *, void *, size_t);
70 ssize_t erofs_listxattr(struct dentry *, char *, size_t);
71 #else
erofs_getxattr(struct inode * inode,int index,const char * name,void * buffer,size_t buffer_size)72 static inline int erofs_getxattr(struct inode *inode, int index,
73 const char *name, void *buffer,
74 size_t buffer_size)
75 {
76 return -EOPNOTSUPP;
77 }
78
79 #define erofs_listxattr (NULL)
80 #define erofs_xattr_handlers (NULL)
81 #endif /* !CONFIG_EROFS_FS_XATTR */
82
83 #ifdef CONFIG_EROFS_FS_POSIX_ACL
84 struct posix_acl *erofs_get_acl(struct inode *inode, int type);
85 #else
86 #define erofs_get_acl (NULL)
87 #endif
88
89 #endif
90
91
