ACCT_CHUNK_MASK
unp->uid_chunk[(file_uid & ACCT_CHUNK_MASK)].space += file_size;
gnp->gid_chunk[(file_gid & ACCT_CHUNK_MASK)].space += file_size;
unp->uid_chunk[(uid & ACCT_CHUNK_MASK)].space += delta;
gnp->gid_chunk[(gid & ACCT_CHUNK_MASK)].space += delta;
unp->uid_chunk[(id & ACCT_CHUNK_MASK)].space = space;
gnp->gid_chunk[(id & ACCT_CHUNK_MASK)].space = space;
unp->uid_chunk[(uid & ACCT_CHUNK_MASK)].limit = limit;
gnp->gid_chunk[(gid & ACCT_CHUNK_MASK)].limit = limit;
space = unp->uid_chunk[(uid & ACCT_CHUNK_MASK)].space;
limit = unp->uid_chunk[(uid & ACCT_CHUNK_MASK)].limit;
space = gnp->gid_chunk[(gid & ACCT_CHUNK_MASK)].space;
limit = gnp->gid_chunk[(gid & ACCT_CHUNK_MASK)].limit;