Move c_src dirs back to toplevel

[bcachefs-tools-debian] / libbcachefs / fifo.h

diff --git a/libbcachefs/fifo.h b/libbcachefs/fifo.h
index 853815f87b3d74a5f0438b9b94a39e1399615475..66b945be10c2309a9e758b228b146047b20674e2 100644 (file)
--- a/libbcachefs/fifo.h
+++ b/libbcachefs/fifo.h
@@ -1,16 +1,21 @@
-#ifndef _BCACHE_FIFO_H
-#define _BCACHE_FIFO_H
+/* 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)                                   \
 ({                                                                     \
@@ -54,7 +59,13 @@ do {                                                                 \
 #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])
@@ -90,7 +101,7 @@ do {                                                                 \
 ({                                                                     \
        bool _r = !fifo_empty((fifo));                                  \
        if (_r)                                                         \
-               (i) = (fifo)->data[--(fifo)->back & (fifo)->mask]       \
+               (i) = (fifo)->data[--(fifo)->back & (fifo)->mask];      \
        _r;                                                             \
 })
 
@@ -100,16 +111,17 @@ do {                                                                      \
 #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++)
-
-#endif /* _BCACHE_FIFO_H */
+            (_iter)++)
 
+#endif /* _BCACHEFS_FIFO_H */