diff options
Diffstat (limited to 'include/litmus/fdso.h')
-rw-r--r-- | include/litmus/fdso.h | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/include/litmus/fdso.h b/include/litmus/fdso.h new file mode 100644 index 00000000000..85a649e2722 --- /dev/null +++ b/include/litmus/fdso.h | |||
@@ -0,0 +1,81 @@ | |||
1 | /* fdso.h - file descriptor attached shared objects | ||
2 | * | ||
3 | * (c) 2007 B. Brandenburg, LITMUS^RT project | ||
4 | */ | ||
5 | |||
6 | #ifndef _LINUX_FDSO_H_ | ||
7 | #define _LINUX_FDSO_H_ | ||
8 | |||
9 | #include <linux/list.h> | ||
10 | #include <asm/atomic.h> | ||
11 | |||
12 | #include <linux/fs.h> | ||
13 | #include <linux/slab.h> | ||
14 | |||
15 | #define MAX_OBJECT_DESCRIPTORS 32 | ||
16 | |||
17 | typedef unsigned int resource_mask_t; | ||
18 | |||
19 | typedef enum { | ||
20 | MIN_OBJ_TYPE = 0, | ||
21 | |||
22 | FMLP_SEM = 0, | ||
23 | SRP_SEM = 1, | ||
24 | |||
25 | MPCP_SEM = 2, | ||
26 | MPCP_VS_SEM = 3, | ||
27 | DPCP_SEM = 4, | ||
28 | |||
29 | PCP_SEM = 5, | ||
30 | |||
31 | DGL_SEM = 6, | ||
32 | |||
33 | MAX_OBJ_TYPE = 6 | ||
34 | } obj_type_t; | ||
35 | |||
36 | struct inode_obj_id { | ||
37 | struct list_head list; | ||
38 | atomic_t count; | ||
39 | struct inode* inode; | ||
40 | |||
41 | obj_type_t type; | ||
42 | void* obj; | ||
43 | unsigned int id; | ||
44 | }; | ||
45 | |||
46 | struct fdso_ops; | ||
47 | |||
48 | struct od_table_entry { | ||
49 | unsigned int used; | ||
50 | |||
51 | struct inode_obj_id* obj; | ||
52 | const struct fdso_ops* class; | ||
53 | }; | ||
54 | |||
55 | struct fdso_ops { | ||
56 | int (*create)(void** obj_ref, obj_type_t type, void* __user); | ||
57 | void (*destroy)(obj_type_t type, void*); | ||
58 | int (*open) (struct od_table_entry*, void* __user); | ||
59 | int (*close) (struct od_table_entry*); | ||
60 | }; | ||
61 | |||
62 | /* translate a userspace supplied od into the raw table entry | ||
63 | * returns NULL if od is invalid | ||
64 | */ | ||
65 | struct od_table_entry* get_entry_for_od(int od); | ||
66 | |||
67 | /* translate a userspace supplied od into the associated object | ||
68 | * returns NULL if od is invalid | ||
69 | */ | ||
70 | static inline void* od_lookup(int od, obj_type_t type) | ||
71 | { | ||
72 | struct od_table_entry* e = get_entry_for_od(od); | ||
73 | return e && e->obj->type == type ? e->obj->obj : NULL; | ||
74 | } | ||
75 | |||
76 | #define lookup_fmlp_sem(od)((struct fmlp_semaphore*) od_lookup(od, FMLP_SEM)) | ||
77 | #define lookup_srp_sem(od) ((struct srp_semaphore*) od_lookup(od, SRP_SEM)) | ||
78 | #define lookup_ics(od) ((struct ics*) od_lookup(od, ICS_ID)) | ||
79 | |||
80 | |||
81 | #endif | ||