+/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _BCACHEFS_FIFO_H
#define _BCACHEFS_FIFO_H
#include "util.h"
-#define DECLARE_FIFO(type, name) \
- struct { \
- size_t front, back, size, mask; \
- type *data; \
- } name
+#define FIFO(type) \
+struct { \
+ size_t front, back, size, mask; \
+ type *data; \
+}
+
+#define DECLARE_FIFO(type, name) FIFO(type) name
#define fifo_buf_size(fifo) \
- (roundup_pow_of_two((fifo)->size) * sizeof((fifo)->data[0]))
+ ((fifo)->size \
+ ? roundup_pow_of_two((fifo)->size) * sizeof((fifo)->data[0]) \
+ : 0)
#define init_fifo(fifo, _size, _gfp) \
({ \
#define fifo_peek_front(fifo) ((fifo)->data[(fifo)->front & (fifo)->mask])
#define fifo_peek_back(fifo) ((fifo)->data[((fifo)->back - 1) & (fifo)->mask])
+#define fifo_entry_idx_abs(fifo, p) \
+ ((((p) >= &fifo_peek_front(fifo) \
+ ? (fifo)->front : (fifo)->back) & ~(fifo)->mask) + \
+ (((p) - (fifo)->data)))
+
#define fifo_entry_idx(fifo, p) (((p) - &fifo_peek_front(fifo)) & (fifo)->mask)
+#define fifo_idx_entry(fifo, i) ((fifo)->data[((fifo)->front + (i)) & (fifo)->mask])
#define fifo_push_back_ref(f) \
(fifo_full((f)) ? NULL : &(f)->data[(f)->back++ & (f)->mask])
({ \
bool _r = !fifo_empty((fifo)); \
if (_r) \
- (i) = (fifo)->data[--(fifo)->back & (fifo)->mask] \
+ (i) = (fifo)->data[--(fifo)->back & (fifo)->mask]; \
_r; \
})
#define fifo_peek(fifo) fifo_peek_front(fifo)
#define fifo_for_each_entry(_entry, _fifo, _iter) \
- for (_iter = (_fifo)->front; \
+ for (typecheck(typeof((_fifo)->front), _iter), \
+ (_iter) = (_fifo)->front; \
((_iter != (_fifo)->back) && \
(_entry = (_fifo)->data[(_iter) & (_fifo)->mask], true)); \
- _iter++)
+ (_iter)++)
#define fifo_for_each_entry_ptr(_ptr, _fifo, _iter) \
- for (_iter = (_fifo)->front; \
+ for (typecheck(typeof((_fifo)->front), _iter), \
+ (_iter) = (_fifo)->front; \
((_iter != (_fifo)->back) && \
(_ptr = &(_fifo)->data[(_iter) & (_fifo)->mask], true)); \
- _iter++)
+ (_iter)++)
#endif /* _BCACHEFS_FIFO_H */