Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | File: fs/ext3/acl.h |
| 3 | |
| 4 | (C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org> |
| 5 | */ |
| 6 | |
Christoph Hellwig | 9a59f452 | 2005-06-23 00:10:19 -0700 | [diff] [blame] | 7 | #include <linux/posix_acl_xattr.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | |
| 9 | #define EXT3_ACL_VERSION 0x0001 |
| 10 | |
| 11 | typedef struct { |
| 12 | __le16 e_tag; |
| 13 | __le16 e_perm; |
| 14 | __le32 e_id; |
| 15 | } ext3_acl_entry; |
| 16 | |
| 17 | typedef struct { |
| 18 | __le16 e_tag; |
| 19 | __le16 e_perm; |
| 20 | } ext3_acl_entry_short; |
| 21 | |
| 22 | typedef struct { |
| 23 | __le32 a_version; |
| 24 | } ext3_acl_header; |
| 25 | |
| 26 | static inline size_t ext3_acl_size(int count) |
| 27 | { |
| 28 | if (count <= 4) { |
| 29 | return sizeof(ext3_acl_header) + |
| 30 | count * sizeof(ext3_acl_entry_short); |
| 31 | } else { |
| 32 | return sizeof(ext3_acl_header) + |
| 33 | 4 * sizeof(ext3_acl_entry_short) + |
| 34 | (count - 4) * sizeof(ext3_acl_entry); |
| 35 | } |
| 36 | } |
| 37 | |
| 38 | static inline int ext3_acl_count(size_t size) |
| 39 | { |
| 40 | ssize_t s; |
| 41 | size -= sizeof(ext3_acl_header); |
| 42 | s = size - 4 * sizeof(ext3_acl_entry_short); |
| 43 | if (s < 0) { |
| 44 | if (size % sizeof(ext3_acl_entry_short)) |
| 45 | return -1; |
| 46 | return size / sizeof(ext3_acl_entry_short); |
| 47 | } else { |
| 48 | if (s % sizeof(ext3_acl_entry)) |
| 49 | return -1; |
| 50 | return s / sizeof(ext3_acl_entry) + 4; |
| 51 | } |
| 52 | } |
| 53 | |
| 54 | #ifdef CONFIG_EXT3_FS_POSIX_ACL |
| 55 | |
| 56 | /* Value for inode->u.ext3_i.i_acl and inode->u.ext3_i.i_default_acl |
| 57 | if the ACL has not been cached */ |
| 58 | #define EXT3_ACL_NOT_CACHED ((void *)-1) |
| 59 | |
| 60 | /* acl.c */ |
| 61 | extern int ext3_permission (struct inode *, int, struct nameidata *); |
| 62 | extern int ext3_acl_chmod (struct inode *); |
| 63 | extern int ext3_init_acl (handle_t *, struct inode *, struct inode *); |
| 64 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | #else /* CONFIG_EXT3_FS_POSIX_ACL */ |
| 66 | #include <linux/sched.h> |
| 67 | #define ext3_permission NULL |
| 68 | |
| 69 | static inline int |
| 70 | ext3_acl_chmod(struct inode *inode) |
| 71 | { |
| 72 | return 0; |
| 73 | } |
| 74 | |
| 75 | static inline int |
| 76 | ext3_init_acl(handle_t *handle, struct inode *inode, struct inode *dir) |
| 77 | { |
| 78 | return 0; |
| 79 | } |
| 80 | #endif /* CONFIG_EXT3_FS_POSIX_ACL */ |
| 81 | |