| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | File: linux/posix_acl.h |
| 3 | |
| 4 | (C) 2002 Andreas Gruenbacher, <a.gruenbacher@computer.org> |
| 5 | */ |
| 6 | |
| 7 | |
| 8 | #ifndef __LINUX_POSIX_ACL_H |
| 9 | #define __LINUX_POSIX_ACL_H |
| 10 | |
| 11 | #include <linux/slab.h> |
| 12 | |
| 13 | #define ACL_UNDEFINED_ID (-1) |
| 14 | |
| 15 | /* a_type field in acl_user_posix_entry_t */ |
| 16 | #define ACL_TYPE_ACCESS (0x8000) |
| 17 | #define ACL_TYPE_DEFAULT (0x4000) |
| 18 | |
| 19 | /* e_tag entry in struct posix_acl_entry */ |
| 20 | #define ACL_USER_OBJ (0x01) |
| 21 | #define ACL_USER (0x02) |
| 22 | #define ACL_GROUP_OBJ (0x04) |
| 23 | #define ACL_GROUP (0x08) |
| 24 | #define ACL_MASK (0x10) |
| 25 | #define ACL_OTHER (0x20) |
| 26 | |
| 27 | /* permissions in the e_perm field */ |
| 28 | #define ACL_READ (0x04) |
| 29 | #define ACL_WRITE (0x02) |
| 30 | #define ACL_EXECUTE (0x01) |
| 31 | //#define ACL_ADD (0x08) |
| 32 | //#define ACL_DELETE (0x10) |
| 33 | |
| 34 | struct posix_acl_entry { |
| 35 | short e_tag; |
| 36 | unsigned short e_perm; |
| 37 | unsigned int e_id; |
| 38 | }; |
| 39 | |
| 40 | struct posix_acl { |
| 41 | atomic_t a_refcount; |
| 42 | unsigned int a_count; |
| 43 | struct posix_acl_entry a_entries[0]; |
| 44 | }; |
| 45 | |
| 46 | #define FOREACH_ACL_ENTRY(pa, acl, pe) \ |
| 47 | for(pa=(acl)->a_entries, pe=pa+(acl)->a_count; pa<pe; pa++) |
| 48 | |
| 49 | |
| 50 | /* |
| 51 | * Duplicate an ACL handle. |
| 52 | */ |
| 53 | static inline struct posix_acl * |
| 54 | posix_acl_dup(struct posix_acl *acl) |
| 55 | { |
| 56 | if (acl) |
| 57 | atomic_inc(&acl->a_refcount); |
| 58 | return acl; |
| 59 | } |
| 60 | |
| 61 | /* |
| 62 | * Free an ACL handle. |
| 63 | */ |
| 64 | static inline void |
| 65 | posix_acl_release(struct posix_acl *acl) |
| 66 | { |
| 67 | if (acl && atomic_dec_and_test(&acl->a_refcount)) |
| 68 | kfree(acl); |
| 69 | } |
| 70 | |
| 71 | |
| 72 | /* posix_acl.c */ |
| 73 | |
| Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 74 | extern struct posix_acl *posix_acl_alloc(int, gfp_t); |
| 75 | extern struct posix_acl *posix_acl_clone(const struct posix_acl *, gfp_t); |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | extern int posix_acl_valid(const struct posix_acl *); |
| 77 | extern int posix_acl_permission(struct inode *, const struct posix_acl *, int); |
| Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 78 | extern struct posix_acl *posix_acl_from_mode(mode_t, gfp_t); |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | extern int posix_acl_equiv_mode(const struct posix_acl *, mode_t *); |
| 80 | extern int posix_acl_create_masq(struct posix_acl *, mode_t *); |
| 81 | extern int posix_acl_chmod_masq(struct posix_acl *, mode_t); |
| 82 | |
| 83 | extern struct posix_acl *get_posix_acl(struct inode *, int); |
| 84 | extern int set_posix_acl(struct inode *, int, struct posix_acl *); |
| 85 | |
| 86 | #endif /* __LINUX_POSIX_ACL_H */ |