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