Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1 | /* |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2 | File: fs/ext4/acl.h |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3 | |
| 4 | (C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org> |
| 5 | */ |
| 6 | |
| 7 | #include <linux/posix_acl_xattr.h> |
| 8 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 9 | #define EXT4_ACL_VERSION 0x0001 |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 10 | |
| 11 | typedef struct { |
| 12 | __le16 e_tag; |
| 13 | __le16 e_perm; |
| 14 | __le32 e_id; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 15 | } ext4_acl_entry; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 16 | |
| 17 | typedef struct { |
| 18 | __le16 e_tag; |
| 19 | __le16 e_perm; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 20 | } ext4_acl_entry_short; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 21 | |
| 22 | typedef struct { |
| 23 | __le32 a_version; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 24 | } ext4_acl_header; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 25 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 26 | static inline size_t ext4_acl_size(int count) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 27 | { |
| 28 | if (count <= 4) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 29 | return sizeof(ext4_acl_header) + |
| 30 | count * sizeof(ext4_acl_entry_short); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 31 | } else { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 32 | return sizeof(ext4_acl_header) + |
| 33 | 4 * sizeof(ext4_acl_entry_short) + |
| 34 | (count - 4) * sizeof(ext4_acl_entry); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 35 | } |
| 36 | } |
| 37 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 38 | static inline int ext4_acl_count(size_t size) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 39 | { |
| 40 | ssize_t s; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 41 | size -= sizeof(ext4_acl_header); |
| 42 | s = size - 4 * sizeof(ext4_acl_entry_short); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 43 | if (s < 0) { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 44 | if (size % sizeof(ext4_acl_entry_short)) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 45 | return -1; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 46 | return size / sizeof(ext4_acl_entry_short); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 47 | } else { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 48 | if (s % sizeof(ext4_acl_entry)) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 49 | return -1; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 50 | return s / sizeof(ext4_acl_entry) + 4; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 51 | } |
| 52 | } |
| 53 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 54 | #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 55 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 56 | /* Value for inode->u.ext4_i.i_acl and inode->u.ext4_i.i_default_acl |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 57 | if the ACL has not been cached */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 58 | #define EXT4_ACL_NOT_CACHED ((void *)-1) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 59 | |
| 60 | /* acl.c */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 61 | extern int ext4_permission (struct inode *, int, struct nameidata *); |
| 62 | extern int ext4_acl_chmod (struct inode *); |
| 63 | extern int ext4_init_acl (handle_t *, struct inode *, struct inode *); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 64 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 65 | #else /* CONFIG_EXT4DEV_FS_POSIX_ACL */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 66 | #include <linux/sched.h> |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 67 | #define ext4_permission NULL |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 68 | |
| 69 | static inline int |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 70 | ext4_acl_chmod(struct inode *inode) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 71 | { |
| 72 | return 0; |
| 73 | } |
| 74 | |
| 75 | static inline int |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 76 | ext4_init_acl(handle_t *handle, struct inode *inode, struct inode *dir) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 77 | { |
| 78 | return 0; |
| 79 | } |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 80 | #endif /* CONFIG_EXT4DEV_FS_POSIX_ACL */ |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 81 | |