Theodore Ts'o | f516676 | 2017-12-17 22:00:59 -0500 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 2 | /* |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 3 | File: fs/ext4/acl.h |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 4 | |
| 5 | (C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org> |
| 6 | */ |
| 7 | |
| 8 | #include <linux/posix_acl_xattr.h> |
| 9 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 10 | #define EXT4_ACL_VERSION 0x0001 |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 11 | |
| 12 | typedef struct { |
| 13 | __le16 e_tag; |
| 14 | __le16 e_perm; |
| 15 | __le32 e_id; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 16 | } ext4_acl_entry; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 17 | |
| 18 | typedef struct { |
| 19 | __le16 e_tag; |
| 20 | __le16 e_perm; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 21 | } ext4_acl_entry_short; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 22 | |
| 23 | typedef struct { |
| 24 | __le32 a_version; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 25 | } ext4_acl_header; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 26 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 27 | static inline size_t ext4_acl_size(int count) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 28 | { |
| 29 | if (count <= 4) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 30 | return sizeof(ext4_acl_header) + |
| 31 | count * sizeof(ext4_acl_entry_short); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 32 | } else { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 33 | return sizeof(ext4_acl_header) + |
| 34 | 4 * sizeof(ext4_acl_entry_short) + |
| 35 | (count - 4) * sizeof(ext4_acl_entry); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 36 | } |
| 37 | } |
| 38 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 39 | static inline int ext4_acl_count(size_t size) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 40 | { |
| 41 | ssize_t s; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 42 | size -= sizeof(ext4_acl_header); |
| 43 | s = size - 4 * sizeof(ext4_acl_entry_short); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 44 | if (s < 0) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 45 | if (size % sizeof(ext4_acl_entry_short)) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 46 | return -1; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 47 | return size / sizeof(ext4_acl_entry_short); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 48 | } else { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 49 | if (s % sizeof(ext4_acl_entry)) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 50 | return -1; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 51 | return s / sizeof(ext4_acl_entry) + 4; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 52 | } |
| 53 | } |
| 54 | |
Theodore Ts'o | 03010a3 | 2008-10-10 20:02:48 -0400 | [diff] [blame] | 55 | #ifdef CONFIG_EXT4_FS_POSIX_ACL |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 56 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 57 | /* acl.c */ |
Christoph Hellwig | 4e34e71 | 2011-07-23 17:37:31 +0200 | [diff] [blame] | 58 | struct posix_acl *ext4_get_acl(struct inode *inode, int type); |
Christoph Hellwig | 64e178a | 2013-12-20 05:16:44 -0800 | [diff] [blame] | 59 | int ext4_set_acl(struct inode *inode, struct posix_acl *acl, int type); |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 60 | extern int ext4_init_acl(handle_t *, struct inode *, struct inode *); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 61 | |
Theodore Ts'o | 03010a3 | 2008-10-10 20:02:48 -0400 | [diff] [blame] | 62 | #else /* CONFIG_EXT4_FS_POSIX_ACL */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 63 | #include <linux/sched.h> |
Christoph Hellwig | 4e34e71 | 2011-07-23 17:37:31 +0200 | [diff] [blame] | 64 | #define ext4_get_acl NULL |
Christoph Hellwig | 64e178a | 2013-12-20 05:16:44 -0800 | [diff] [blame] | 65 | #define ext4_set_acl NULL |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 66 | |
| 67 | static inline int |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 68 | ext4_init_acl(handle_t *handle, struct inode *inode, struct inode *dir) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 69 | { |
| 70 | return 0; |
| 71 | } |
Theodore Ts'o | 03010a3 | 2008-10-10 20:02:48 -0400 | [diff] [blame] | 72 | #endif /* CONFIG_EXT4_FS_POSIX_ACL */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 73 | |