NILFS_DIRECT_NBLOCKS
if (nitems > NILFS_DIRECT_NBLOCKS)
nitems = NILFS_DIRECT_NBLOCKS;
for (i = 0, j = 0; i < NILFS_DIRECT_NBLOCKS; i++) {
#define NILFS_DIRECT_KEY_MAX (NILFS_DIRECT_NBLOCKS - 1)