From 1c6fdbd8f2465ddfb73a01ec620cbf3d14044e1a Mon Sep 17 00:00:00 2001 From: Kent Overstreet Date: Thu, 16 Mar 2017 22:18:50 -0800 Subject: bcachefs: Initial commit Initially forked from drivers/md/bcache, bcachefs is a new copy-on-write filesystem with every feature you could possibly want. Website: https://bcachefs.org Signed-off-by: Kent Overstreet --- fs/bcachefs/vstructs.h | 63 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 63 insertions(+) create mode 100644 fs/bcachefs/vstructs.h (limited to 'fs/bcachefs/vstructs.h') diff --git a/fs/bcachefs/vstructs.h b/fs/bcachefs/vstructs.h new file mode 100644 index 000000000000..c099cdc0605f --- /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)); \ + \ + (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)) ((_s)->_data + __vstruct_u64s(_s))) +#define vstruct_last(_s) \ + ((typeof(&(_s)->start[0])) ((_s)->_data + __vstruct_u64s(_s))) +#define vstruct_end(_s) \ + ((void *) ((_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 */ -- cgit v1.2.3