RESYNC_BLOCK_SIZE
#define RESYNC_PAGES ((RESYNC_BLOCK_SIZE + PAGE_SIZE-1) / PAGE_SIZE)
#define RESYNC_SECTORS (RESYNC_BLOCK_SIZE >> 9)
#define RESYNC_WINDOW (RESYNC_BLOCK_SIZE * RESYNC_DEPTH)
buffs = RESYNC_WINDOW / RESYNC_BLOCK_SIZE;
#define RESYNC_SECTORS (RESYNC_BLOCK_SIZE >> 9)
#define RESYNC_DEPTH (32*1024*1024/RESYNC_BLOCK_SIZE)
buffs = RESYNC_WINDOW / RESYNC_BLOCK_SIZE;