1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* |
3 | File: fs/ext4/acl.h |
4 | |
5 | (C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org> |
6 | */ |
7 | |
8 | #include <linux/posix_acl_xattr.h> |
9 | |
10 | #define EXT4_ACL_VERSION 0x0001 |
11 | |
12 | typedef struct { |
13 | __le16 e_tag; |
14 | __le16 e_perm; |
15 | __le32 e_id; |
16 | } ext4_acl_entry; |
17 | |
18 | typedef struct { |
19 | __le16 e_tag; |
20 | __le16 e_perm; |
21 | } ext4_acl_entry_short; |
22 | |
23 | typedef struct { |
24 | __le32 ; |
25 | } ; |
26 | |
27 | static inline size_t ext4_acl_size(int count) |
28 | { |
29 | if (count <= 4) { |
30 | return sizeof(ext4_acl_header) + |
31 | count * sizeof(ext4_acl_entry_short); |
32 | } else { |
33 | return sizeof(ext4_acl_header) + |
34 | 4 * sizeof(ext4_acl_entry_short) + |
35 | (count - 4) * sizeof(ext4_acl_entry); |
36 | } |
37 | } |
38 | |
39 | static inline int ext4_acl_count(size_t size) |
40 | { |
41 | ssize_t s; |
42 | size -= sizeof(ext4_acl_header); |
43 | s = size - 4 * sizeof(ext4_acl_entry_short); |
44 | if (s < 0) { |
45 | if (size % sizeof(ext4_acl_entry_short)) |
46 | return -1; |
47 | return size / sizeof(ext4_acl_entry_short); |
48 | } else { |
49 | if (s % sizeof(ext4_acl_entry)) |
50 | return -1; |
51 | return s / sizeof(ext4_acl_entry) + 4; |
52 | } |
53 | } |
54 | |
55 | #ifdef CONFIG_EXT4_FS_POSIX_ACL |
56 | |
57 | /* acl.c */ |
58 | struct posix_acl *ext4_get_acl(struct inode *inode, int type, bool rcu); |
59 | int ext4_set_acl(struct mnt_idmap *idmap, struct dentry *dentry, |
60 | struct posix_acl *acl, int type); |
61 | extern int ext4_init_acl(handle_t *, struct inode *, struct inode *); |
62 | |
63 | #else /* CONFIG_EXT4_FS_POSIX_ACL */ |
64 | #include <linux/sched.h> |
65 | #define ext4_get_acl NULL |
66 | #define ext4_set_acl NULL |
67 | |
68 | static inline int |
69 | ext4_init_acl(handle_t *handle, struct inode *inode, struct inode *dir) |
70 | { |
71 | /* usually, the umask is applied by posix_acl_create(), but if |
72 | ext4 ACL support is disabled at compile time, we need to do |
73 | it here, because posix_acl_create() will never be called */ |
74 | inode->i_mode &= ~current_umask(); |
75 | |
76 | return 0; |
77 | } |
78 | #endif /* CONFIG_EXT4_FS_POSIX_ACL */ |
79 | |
80 | |