GC_SECTORS_USED_SIZE 215 drivers/md/bcache/bcache.h #define MAX_GC_SECTORS_USED (~(~0ULL << GC_SECTORS_USED_SIZE)) GC_SECTORS_USED_SIZE 216 drivers/md/bcache/bcache.h BITMASK(GC_SECTORS_USED, struct bucket, gc_mark, 2, GC_SECTORS_USED_SIZE);