1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun File: fs/ext4/acl.h
4*4882a593Smuzhiyun
5*4882a593Smuzhiyun (C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org>
6*4882a593Smuzhiyun */
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun #include <linux/posix_acl_xattr.h>
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun #define EXT4_ACL_VERSION 0x0001
11*4882a593Smuzhiyun
12*4882a593Smuzhiyun typedef struct {
13*4882a593Smuzhiyun __le16 e_tag;
14*4882a593Smuzhiyun __le16 e_perm;
15*4882a593Smuzhiyun __le32 e_id;
16*4882a593Smuzhiyun } ext4_acl_entry;
17*4882a593Smuzhiyun
18*4882a593Smuzhiyun typedef struct {
19*4882a593Smuzhiyun __le16 e_tag;
20*4882a593Smuzhiyun __le16 e_perm;
21*4882a593Smuzhiyun } ext4_acl_entry_short;
22*4882a593Smuzhiyun
23*4882a593Smuzhiyun typedef struct {
24*4882a593Smuzhiyun __le32 a_version;
25*4882a593Smuzhiyun } ext4_acl_header;
26*4882a593Smuzhiyun
ext4_acl_size(int count)27*4882a593Smuzhiyun static inline size_t ext4_acl_size(int count)
28*4882a593Smuzhiyun {
29*4882a593Smuzhiyun if (count <= 4) {
30*4882a593Smuzhiyun return sizeof(ext4_acl_header) +
31*4882a593Smuzhiyun count * sizeof(ext4_acl_entry_short);
32*4882a593Smuzhiyun } else {
33*4882a593Smuzhiyun return sizeof(ext4_acl_header) +
34*4882a593Smuzhiyun 4 * sizeof(ext4_acl_entry_short) +
35*4882a593Smuzhiyun (count - 4) * sizeof(ext4_acl_entry);
36*4882a593Smuzhiyun }
37*4882a593Smuzhiyun }
38*4882a593Smuzhiyun
ext4_acl_count(size_t size)39*4882a593Smuzhiyun static inline int ext4_acl_count(size_t size)
40*4882a593Smuzhiyun {
41*4882a593Smuzhiyun ssize_t s;
42*4882a593Smuzhiyun size -= sizeof(ext4_acl_header);
43*4882a593Smuzhiyun s = size - 4 * sizeof(ext4_acl_entry_short);
44*4882a593Smuzhiyun if (s < 0) {
45*4882a593Smuzhiyun if (size % sizeof(ext4_acl_entry_short))
46*4882a593Smuzhiyun return -1;
47*4882a593Smuzhiyun return size / sizeof(ext4_acl_entry_short);
48*4882a593Smuzhiyun } else {
49*4882a593Smuzhiyun if (s % sizeof(ext4_acl_entry))
50*4882a593Smuzhiyun return -1;
51*4882a593Smuzhiyun return s / sizeof(ext4_acl_entry) + 4;
52*4882a593Smuzhiyun }
53*4882a593Smuzhiyun }
54*4882a593Smuzhiyun
55*4882a593Smuzhiyun #ifdef CONFIG_EXT4_FS_POSIX_ACL
56*4882a593Smuzhiyun
57*4882a593Smuzhiyun /* acl.c */
58*4882a593Smuzhiyun struct posix_acl *ext4_get_acl(struct inode *inode, int type);
59*4882a593Smuzhiyun int ext4_set_acl(struct inode *inode, struct posix_acl *acl, int type);
60*4882a593Smuzhiyun extern int ext4_init_acl(handle_t *, struct inode *, struct inode *);
61*4882a593Smuzhiyun
62*4882a593Smuzhiyun #else /* CONFIG_EXT4_FS_POSIX_ACL */
63*4882a593Smuzhiyun #include <linux/sched.h>
64*4882a593Smuzhiyun #define ext4_get_acl NULL
65*4882a593Smuzhiyun #define ext4_set_acl NULL
66*4882a593Smuzhiyun
67*4882a593Smuzhiyun static inline int
ext4_init_acl(handle_t * handle,struct inode * inode,struct inode * dir)68*4882a593Smuzhiyun ext4_init_acl(handle_t *handle, struct inode *inode, struct inode *dir)
69*4882a593Smuzhiyun {
70*4882a593Smuzhiyun return 0;
71*4882a593Smuzhiyun }
72*4882a593Smuzhiyun #endif /* CONFIG_EXT4_FS_POSIX_ACL */
73*4882a593Smuzhiyun
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