move Rust sources to top level, C sources into c_src

[bcachefs-tools-debian] / c_src / libbcachefs / vstructs.h

diff --git a/c_src/libbcachefs/vstructs.h b/c_src/libbcachefs/vstructs.h
new file mode 100644 (file)
index 0000000..2ad338e
--- /dev/null
+++ b/c_src/libbcachefs/vstructs.h
@@ -0,0 +1,63 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _VSTRUCTS_H
+#define _VSTRUCTS_H
+
+#include "util.h"
+
+/*
+ * NOTE: we can't differentiate between __le64 and u64 with type_is - this
+ * assumes u64 is little endian:
+ */
+#define __vstruct_u64s(_s)                                             \
+({                                                                     \
+       ( type_is((_s)->u64s, u64) ? le64_to_cpu((__force __le64) (_s)->u64s)           \
+       : type_is((_s)->u64s, u32) ? le32_to_cpu((__force __le32) (_s)->u64s)           \
+       : type_is((_s)->u64s, u16) ? le16_to_cpu((__force __le16) (_s)->u64s)           \
+       : ((__force u8) ((_s)->u64s)));                                         \
+})
+
+#define __vstruct_bytes(_type, _u64s)                                  \
+({                                                                     \
+       BUILD_BUG_ON(offsetof(_type, _data) % sizeof(u64));             \
+                                                                       \
+       (size_t) (offsetof(_type, _data) + (_u64s) * sizeof(u64));      \
+})
+
+#define vstruct_bytes(_s)                                              \
+       __vstruct_bytes(typeof(*(_s)), __vstruct_u64s(_s))
+
+#define __vstruct_blocks(_type, _sector_block_bits, _u64s)             \
+       (round_up(__vstruct_bytes(_type, _u64s),                        \
+                 512 << (_sector_block_bits)) >> (9 + (_sector_block_bits)))
+
+#define vstruct_blocks(_s, _sector_block_bits)                         \
+       __vstruct_blocks(typeof(*(_s)), _sector_block_bits, __vstruct_u64s(_s))
+
+#define vstruct_blocks_plus(_s, _sector_block_bits, _u64s)             \
+       __vstruct_blocks(typeof(*(_s)), _sector_block_bits,             \
+                        __vstruct_u64s(_s) + (_u64s))
+
+#define vstruct_sectors(_s, _sector_block_bits)                                \
+       (round_up(vstruct_bytes(_s), 512 << (_sector_block_bits)) >> 9)
+
+#define vstruct_next(_s)                                               \
+       ((typeof(_s))                   ((u64 *) (_s)->_data + __vstruct_u64s(_s)))
+#define vstruct_last(_s)                                               \
+       ((typeof(&(_s)->start[0]))      ((u64 *) (_s)->_data + __vstruct_u64s(_s)))
+#define vstruct_end(_s)                                                        \
+       ((void *)                       ((u64 *) (_s)->_data + __vstruct_u64s(_s)))
+
+#define vstruct_for_each(_s, _i)                                       \
+       for (typeof(&(_s)->start[0]) _i = (_s)->start;                  \
+            _i < vstruct_last(_s);                                     \
+            _i = vstruct_next(_i))
+
+#define vstruct_for_each_safe(_s, _i)                                  \
+       for (typeof(&(_s)->start[0]) _next, _i = (_s)->start;           \
+            _i < vstruct_last(_s) && (_next = vstruct_next(_i), true); \
+            _i = _next)
+
+#define vstruct_idx(_s, _idx)                                          \
+       ((typeof(&(_s)->start[0])) ((_s)->_data + (_idx)))
+
+#endif /* _VSTRUCTS_H */