1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 File: fs/ext2/acl.h
4
5 (C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org>
6 */
7
8 #include <linux/posix_acl_xattr.h>
9
10 #define EXT2_ACL_VERSION 0x0001
11
12 typedef struct {
13 __le16 e_tag;
14 __le16 e_perm;
15 __le32 e_id;
16 } ext2_acl_entry;
17
18 typedef struct {
19 __le16 e_tag;
20 __le16 e_perm;
21 } ext2_acl_entry_short;
22
23 typedef struct {
24 __le32 a_version;
25 } ext2_acl_header;
26
27 static inline size_t ext2_acl_size(int count)
28 {
29 if (count <= 4) {
30 return sizeof(ext2_acl_header) +
31 count * sizeof(ext2_acl_entry_short);
32 } else {
33 return sizeof(ext2_acl_header) +
34 4 * sizeof(ext2_acl_entry_short) +
35 (count - 4) * sizeof(ext2_acl_entry);
36 }
37 }
38
39 static inline int ext2_acl_count(size_t size)
40 {
41 ssize_t s;
42 size -= sizeof(ext2_acl_header);
43 s = size - 4 * sizeof(ext2_acl_entry_short);
44 if (s < 0) {
45 if (size % sizeof(ext2_acl_entry_short))
46 return -1;
47 return size / sizeof(ext2_acl_entry_short);
48 } else {
49 if (s % sizeof(ext2_acl_entry))
50 return -1;
51 return s / sizeof(ext2_acl_entry) + 4;
52 }
53 }
54
55 #ifdef CONFIG_EXT2_FS_POSIX_ACL
56
57 /* acl.c */
58 extern struct posix_acl *ext2_get_acl(struct inode *inode, int type, bool rcu);
59 extern int ext2_set_acl(struct mnt_idmap *idmap, struct dentry *dentry,
60 struct posix_acl *acl, int type);
61 extern int ext2_init_acl (struct inode *, struct inode *);
62
63 #else
64 #include <linux/sched.h>
65 #define ext2_get_acl NULL
66 #define ext2_set_acl NULL
67
68 static inline int ext2_init_acl (struct inode *inode, struct inode *dir)
69 {
70 return 0;
71 }
72 #endif
73
74
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