pl

UPL describing pages needed to be paged out. If UPL is NULL, then it means the filesystem has opted into VFC_VFSVNOP_PAGEOUTV2 semantics, which means that it will create and operate on its own UPLs as opposed to relying on the one passed down into the filesystem. This means that the filesystem must be responsible for N cluster_pageout calls for N dirty ranges in the UPL.