6 #define DECLARE_FIFO(type, name) \
8 size_t front, back, size, mask; \
12 #define fifo_buf_size(fifo) \
13 (roundup_pow_of_two((fifo)->size) * sizeof((fifo)->data[0]))
15 #define init_fifo(fifo, _size, _gfp) \
17 (fifo)->front = (fifo)->back = 0; \
18 (fifo)->size = (_size); \
19 (fifo)->mask = (fifo)->size \
20 ? roundup_pow_of_two((fifo)->size) - 1 \
22 (fifo)->data = kvpmalloc(fifo_buf_size(fifo), (_gfp)); \
25 #define free_fifo(fifo) \
27 kvpfree((fifo)->data, fifo_buf_size(fifo)); \
28 (fifo)->data = NULL; \
31 #define fifo_swap(l, r) \
33 swap((l)->front, (r)->front); \
34 swap((l)->back, (r)->back); \
35 swap((l)->size, (r)->size); \
36 swap((l)->mask, (r)->mask); \
37 swap((l)->data, (r)->data); \
40 #define fifo_move(dest, src) \
42 typeof(*((dest)->data)) _t; \
43 while (!fifo_full(dest) && \
45 fifo_push(dest, _t); \
48 #define fifo_used(fifo) (((fifo)->back - (fifo)->front))
49 #define fifo_free(fifo) ((fifo)->size - fifo_used(fifo))
51 #define fifo_empty(fifo) ((fifo)->front == (fifo)->back)
52 #define fifo_full(fifo) (fifo_used(fifo) == (fifo)->size)
54 #define fifo_peek_front(fifo) ((fifo)->data[(fifo)->front & (fifo)->mask])
55 #define fifo_peek_back(fifo) ((fifo)->data[((fifo)->back - 1) & (fifo)->mask])
57 #define fifo_entry_idx(fifo, p) (((p) - &fifo_peek_front(fifo)) & (fifo)->mask)
59 #define fifo_push_back_ref(f) \
60 (fifo_full((f)) ? NULL : &(f)->data[(f)->back++ & (f)->mask])
62 #define fifo_push_front_ref(f) \
63 (fifo_full((f)) ? NULL : &(f)->data[--(f)->front & (f)->mask])
65 #define fifo_push_back(fifo, new) \
67 typeof((fifo)->data) _r = fifo_push_back_ref(fifo); \
73 #define fifo_push_front(fifo, new) \
75 typeof((fifo)->data) _r = fifo_push_front_ref(fifo); \
81 #define fifo_pop_front(fifo, i) \
83 bool _r = !fifo_empty((fifo)); \
85 (i) = (fifo)->data[(fifo)->front++ & (fifo)->mask]; \
89 #define fifo_pop_back(fifo, i) \
91 bool _r = !fifo_empty((fifo)); \
93 (i) = (fifo)->data[--(fifo)->back & (fifo)->mask] \
97 #define fifo_push_ref(fifo) fifo_push_back_ref(fifo)
98 #define fifo_push(fifo, i) fifo_push_back(fifo, (i))
99 #define fifo_pop(fifo, i) fifo_pop_front(fifo, (i))
100 #define fifo_peek(fifo) fifo_peek_front(fifo)
102 #define fifo_for_each_entry(_entry, _fifo, _iter) \
103 for (_iter = (_fifo)->front; \
104 ((_iter != (_fifo)->back) && \
105 (_entry = (_fifo)->data[(_iter) & (_fifo)->mask], true)); \
108 #define fifo_for_each_entry_ptr(_ptr, _fifo, _iter) \
109 for (_iter = (_fifo)->front; \
110 ((_iter != (_fifo)->back) && \
111 (_ptr = &(_fifo)->data[(_iter) & (_fifo)->mask], true)); \
114 #endif /* _BCACHE_FIFO_H */