K 10
svn:author
V 5
asami
K 8
svn:date
V 27
1996-01-31T03:28:21.000000Z
K 7
svn:log
V 509
Mirror support.  When CCDF_MIRROR is set:

(1) The reads are always done from the first n/2 disks.

(2) Each write is done twice, to the "data" disk (in the first half) and
    the "mirror" disk (in the second half).

ccdbuffer() now takes an extra argument (struct ccdbuf **) and stores
the pointer to ccdbuf in there.  In case of a mirrored write, it
allocates and stores two pointers.  The "residual" is also doubled
for mirrored writes so that ccdiodone() can correctly tell when all
the writes are done.

END