1 /* SPDX-License-Identifier: GPL-2.0 */ 1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* 2 /*
3 File: fs/ext2/acl.h 3 File: fs/ext2/acl.h
4 4
5 (C) 2001 Andreas Gruenbacher, <a.gruenbacher 5 (C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org>
6 */ 6 */
7 7
8 #include <linux/posix_acl_xattr.h> 8 #include <linux/posix_acl_xattr.h>
9 9
10 #define EXT2_ACL_VERSION 0x0001 10 #define EXT2_ACL_VERSION 0x0001
11 11
12 typedef struct { 12 typedef struct {
13 __le16 e_tag; 13 __le16 e_tag;
14 __le16 e_perm; 14 __le16 e_perm;
15 __le32 e_id; 15 __le32 e_id;
16 } ext2_acl_entry; 16 } ext2_acl_entry;
17 17
18 typedef struct { 18 typedef struct {
19 __le16 e_tag; 19 __le16 e_tag;
20 __le16 e_perm; 20 __le16 e_perm;
21 } ext2_acl_entry_short; 21 } ext2_acl_entry_short;
22 22
23 typedef struct { 23 typedef struct {
24 __le32 a_version; 24 __le32 a_version;
25 } ext2_acl_header; 25 } ext2_acl_header;
26 26
27 static inline size_t ext2_acl_size(int count) 27 static inline size_t ext2_acl_size(int count)
28 { 28 {
29 if (count <= 4) { 29 if (count <= 4) {
30 return sizeof(ext2_acl_header) 30 return sizeof(ext2_acl_header) +
31 count * sizeof(ext2_acl 31 count * sizeof(ext2_acl_entry_short);
32 } else { 32 } else {
33 return sizeof(ext2_acl_header) 33 return sizeof(ext2_acl_header) +
34 4 * sizeof(ext2_acl_ent 34 4 * sizeof(ext2_acl_entry_short) +
35 (count - 4) * sizeof(ex 35 (count - 4) * sizeof(ext2_acl_entry);
36 } 36 }
37 } 37 }
38 38
39 static inline int ext2_acl_count(size_t size) 39 static inline int ext2_acl_count(size_t size)
40 { 40 {
41 ssize_t s; 41 ssize_t s;
42 size -= sizeof(ext2_acl_header); 42 size -= sizeof(ext2_acl_header);
43 s = size - 4 * sizeof(ext2_acl_entry_s 43 s = size - 4 * sizeof(ext2_acl_entry_short);
44 if (s < 0) { 44 if (s < 0) {
45 if (size % sizeof(ext2_acl_ent 45 if (size % sizeof(ext2_acl_entry_short))
46 return -1; 46 return -1;
47 return size / sizeof(ext2_acl_ 47 return size / sizeof(ext2_acl_entry_short);
48 } else { 48 } else {
49 if (s % sizeof(ext2_acl_entry) 49 if (s % sizeof(ext2_acl_entry))
50 return -1; 50 return -1;
51 return s / sizeof(ext2_acl_ent 51 return s / sizeof(ext2_acl_entry) + 4;
52 } 52 }
53 } 53 }
54 54
55 #ifdef CONFIG_EXT2_FS_POSIX_ACL 55 #ifdef CONFIG_EXT2_FS_POSIX_ACL
56 56
57 /* acl.c */ 57 /* acl.c */
58 extern struct posix_acl *ext2_get_acl(struct i 58 extern struct posix_acl *ext2_get_acl(struct inode *inode, int type, bool rcu);
59 extern int ext2_set_acl(struct mnt_idmap *idma 59 extern int ext2_set_acl(struct mnt_idmap *idmap, struct dentry *dentry,
60 struct posix_acl *acl, 60 struct posix_acl *acl, int type);
61 extern int ext2_init_acl (struct inode *, stru 61 extern int ext2_init_acl (struct inode *, struct inode *);
62 62
63 #else 63 #else
64 #include <linux/sched.h> 64 #include <linux/sched.h>
65 #define ext2_get_acl NULL 65 #define ext2_get_acl NULL
66 #define ext2_set_acl NULL 66 #define ext2_set_acl NULL
67 67
68 static inline int ext2_init_acl (struct inode 68 static inline int ext2_init_acl (struct inode *inode, struct inode *dir)
69 { 69 {
70 return 0; 70 return 0;
71 } 71 }
72 #endif 72 #endif
73 73
74 74
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