Added functions responsible for acquiring/releasing write buffer entries
from the per-io_channel caches. They're also in charge of limiting user
writes by reducing the number of available entries to the user.
Change-Id: I23adfe36065139036f9b72a016e34fbf6eb29230
Signed-off-by: Konrad Sztyber <konrad.sztyber@intel.com>
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/904
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Wojciech Malikowski <wojciech.malikowski@intel.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
1e8c9a4de2