| 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 a_version; |
| 25 | } ext4_acl_header; |
| 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); |
| 59 | int ext4_set_acl(struct inode *inode, struct posix_acl *acl, int type); |
| 60 | extern int ext4_init_acl(handle_t *, struct inode *, struct inode *); |
| 61 | |
| 62 | #else /* CONFIG_EXT4_FS_POSIX_ACL */ |
| 63 | #include <linux/sched.h> |
| 64 | #define ext4_get_acl NULL |
| 65 | #define ext4_set_acl NULL |
| 66 | |
| 67 | static inline int |
| 68 | ext4_init_acl(handle_t *handle, struct inode *inode, struct inode *dir) |
| 69 | { |
| 70 | return 0; |
| 71 | } |
| 72 | #endif /* CONFIG_EXT4_FS_POSIX_ACL */ |
| 73 | |