Merge pull request #42580 from hualongfeng/solve_competition_between_read_and_retire

librbd/cache/pwl/ssd: solve competition between read and retire

Reviewed-by: Mahati Chamarthy <mahati.chamarthy@intel.com>
Reviewed-by: Ilya Dryomov <idryomov@gmail.com>

diff --cc src/librbd/cache/pwl/AbstractWriteLog.cc
Simple merge

diff --cc src/librbd/cache/pwl/rwl/WriteLog.cc
Simple merge

diff --cc src/librbd/cache/pwl/ssd/WriteLog.cc
Simple merge