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 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); 76 extern int posix_acl_valid(const struct posix_acl *); 77 extern int posix_acl_permission(struct inode *, const struct posix_acl *, int); 78 extern struct posix_acl *posix_acl_from_mode(mode_t, gfp_t); 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 */ 87