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-rw-r--r--fs/bcachefs/vstructs.h63
1 files changed, 63 insertions, 0 deletions
diff --git a/fs/bcachefs/vstructs.h b/fs/bcachefs/vstructs.h
new file mode 100644
index 0000000000..a6561b4b36
--- /dev/null
+++ b/fs/bcachefs/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 (_i = (_s)->start; \
+ _i < vstruct_last(_s); \
+ _i = vstruct_next(_i))
+
+#define vstruct_for_each_safe(_s, _i, _t) \
+ for (_i = (_s)->start; \
+ _i < vstruct_last(_s) && (_t = vstruct_next(_i), true); \
+ _i = _t)
+
+#define vstruct_idx(_s, _idx) \
+ ((typeof(&(_s)->start[0])) ((_s)->_data + (_idx)))
+
+#endif /* _VSTRUCTS_H */