OPEN_HOW_SIZE_VER0
BUILD_BUG_ON(sizeof(struct open_how) < OPEN_HOW_SIZE_VER0);
if (unlikely(usize < OPEN_HOW_SIZE_VER0))
#define OPEN_HOW_SIZE_LATEST OPEN_HOW_SIZE_VER0
if (len < OPEN_HOW_SIZE_VER0)
BUILD_BUG_ON(sizeof(struct open_how) != OPEN_HOW_SIZE_VER0);
#define OPEN_HOW_SIZE_LATEST OPEN_HOW_SIZE_VER0
.size = OPEN_HOW_SIZE_VER0 - 1, .err = -EINVAL },