xref: /openbmc/linux/fs/erofs/xattr.h (revision 5a158981)
1  /* SPDX-License-Identifier: GPL-2.0-only */
2  /*
3   * Copyright (C) 2017-2018 HUAWEI, Inc.
4   *             http://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  
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  
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  
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  
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] = &posix_acl_access_xattr_handler,
53  	[EROFS_XATTR_INDEX_POSIX_ACL_DEFAULT] =
54  		&posix_acl_default_xattr_handler,
55  #endif
56  	[EROFS_XATTR_INDEX_TRUSTED] = &erofs_xattr_trusted_handler,
57  #ifdef CONFIG_EROFS_FS_SECURITY
58  	[EROFS_XATTR_INDEX_SECURITY] = &erofs_xattr_security_handler,
59  #endif
60  };
61  
62  	return idx && idx < ARRAY_SIZE(xattr_handler_map) ?
63  		xattr_handler_map[idx] : NULL;
64  }
65  
66  extern const struct xattr_handler *erofs_xattr_handlers[];
67  
68  int erofs_getxattr(struct inode *, int, const char *, void *, size_t);
69  ssize_t erofs_listxattr(struct dentry *, char *, size_t);
70  #else
71  static inline int erofs_getxattr(struct inode *inode, int index,
72  				 const char *name, void *buffer,
73  				 size_t buffer_size)
74  {
75  	return -EOPNOTSUPP;
76  }
77  
78  static inline ssize_t erofs_listxattr(struct dentry *dentry,
79  				      char *buffer, size_t buffer_size)
80  {
81  	return -EOPNOTSUPP;
82  }
83  #endif	/* !CONFIG_EROFS_FS_XATTR */
84  
85  #ifdef CONFIG_EROFS_FS_POSIX_ACL
86  struct posix_acl *erofs_get_acl(struct inode *inode, int type);
87  #else
88  #define erofs_get_acl	(NULL)
89  #endif
90  
91  #endif
92  
93