XFR_DATA_BLOCK
if ((rqe->flags & (XFR_DATA_BLOCK | XFR_BAD_SUBDISK | XFR_NORMAL_WRITE))
== (XFR_DATA_BLOCK | XFR_NORMAL_WRITE)) { /* good data block to write */
rqe->flags = m.flags | XFR_DATA_BLOCK | XFR_MALLOCED; /* transfer flags */
rqe->flags = m.flags | XFR_DATA_BLOCK; /* transfer flags */