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 
inlinexattr_header_size(struct inode * inode)16 static inline unsigned int inlinexattr_header_size(struct inode *inode)
17 {
18 	return sizeof(struct erofs_xattr_ibody_header) +
19 		sizeof(u32) * EROFS_I(inode)->xattr_shared_count;
20 }
21 
xattrblock_addr(struct erofs_sb_info * sbi,unsigned int xattr_id)22 static inline erofs_blk_t xattrblock_addr(struct erofs_sb_info *sbi,
23 					  unsigned int xattr_id)
24 {
25 #ifdef CONFIG_EROFS_FS_XATTR
26 	return sbi->xattr_blkaddr +
27 		xattr_id * sizeof(__u32) / EROFS_BLKSIZ;
28 #else
29 	return 0;
30 #endif
31 }
32 
xattrblock_offset(struct erofs_sb_info * sbi,unsigned int xattr_id)33 static inline unsigned int xattrblock_offset(struct erofs_sb_info *sbi,
34 					     unsigned int xattr_id)
35 {
36 	return (xattr_id * sizeof(__u32)) % EROFS_BLKSIZ;
37 }
38 
39 #ifdef CONFIG_EROFS_FS_XATTR
40 extern const struct xattr_handler erofs_xattr_user_handler;
41 extern const struct xattr_handler erofs_xattr_trusted_handler;
42 extern const struct xattr_handler erofs_xattr_security_handler;
43 
erofs_xattr_handler(unsigned int idx)44 static inline const struct xattr_handler *erofs_xattr_handler(unsigned int idx)
45 {
46 	static const struct xattr_handler *xattr_handler_map[] = {
47 		[EROFS_XATTR_INDEX_USER] = &erofs_xattr_user_handler,
48 #ifdef CONFIG_EROFS_FS_POSIX_ACL
49 		[EROFS_XATTR_INDEX_POSIX_ACL_ACCESS] =
50 			&posix_acl_access_xattr_handler,
51 		[EROFS_XATTR_INDEX_POSIX_ACL_DEFAULT] =
52 			&posix_acl_default_xattr_handler,
53 #endif
54 		[EROFS_XATTR_INDEX_TRUSTED] = &erofs_xattr_trusted_handler,
55 #ifdef CONFIG_EROFS_FS_SECURITY
56 		[EROFS_XATTR_INDEX_SECURITY] = &erofs_xattr_security_handler,
57 #endif
58 	};
59 
60 	return idx && idx < ARRAY_SIZE(xattr_handler_map) ?
61 		xattr_handler_map[idx] : NULL;
62 }
63 
64 extern const struct xattr_handler *erofs_xattr_handlers[];
65 
66 int erofs_getxattr(struct inode *, int, const char *, void *, size_t);
67 ssize_t erofs_listxattr(struct dentry *, char *, size_t);
68 #else
erofs_getxattr(struct inode * inode,int index,const char * name,void * buffer,size_t buffer_size)69 static inline int erofs_getxattr(struct inode *inode, int index,
70 				 const char *name, void *buffer,
71 				 size_t buffer_size)
72 {
73 	return -EOPNOTSUPP;
74 }
75 
76 #define erofs_listxattr (NULL)
77 #define erofs_xattr_handlers (NULL)
78 #endif	/* !CONFIG_EROFS_FS_XATTR */
79 
80 #ifdef CONFIG_EROFS_FS_POSIX_ACL
81 struct posix_acl *erofs_get_acl(struct inode *inode, int type, bool rcu);
82 #else
83 #define erofs_get_acl	(NULL)
84 #endif
85 
86 #endif
87