When a chunk cannot be compressed enough to save one I/O
unit, we will just write the uncompressed data to disk. In
this case, we want the helper routine to use the decomp_buf
instead of the comp_buf.
To facilitate that, save some information in the request
object on the number of io_units to be read from or written
to disk, and whether the data is compressed or not. We
could easily deduce if the data is compressed based on the
number of io_units but saving it in the structure will
save a few instructions and simplify the code a bit.
Signed-off-by: Jim Harris <james.r.harris@intel.com>
Change-Id: I1537130577943e19fe4dfcee58eac453eca3c29b
Reviewed-on: https://review.gerrithub.io/c/spdk/spdk/+/449259
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Changpeng Liu <changpeng.liu@intel.com>
Reviewed-by: Paul Luse <paul.e.luse@intel.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
2edc652913