some performance improvements, check for system wide mounts only once while writing share keys
some performance improvements, check for system wide mounts only once while writing share keys

bluelml/core,cernbox/core,nextcloud/server,jbicha/server,pmattern/server,cernbox/core,pixelipo/server,pixelipo/server,michaelletzgus/nextcloud-server,sharidas/core,cernbox/core,michaelletzgus/nextcloud-server,xx621998xx/server,whitekiba/server,bluelml/core,endsguy/server,phil-davis/core,pixelipo/server,IljaN/core,whitekiba/server,andreas-p/nextcloud-server,lrytz/core,owncloud/core,endsguy/server,IljaN/core,jbicha/server,endsguy/server,pixelipo/server,sharidas/core,xx621998xx/server,nextcloud/server,IljaN/core,cernbox/core,owncloud/core,whitekiba/server,owncloud/core,sharidas/core,owncloud/core,pmattern/server,endsguy/server,xx621998xx/server,lrytz/core,michaelletzgus/nextcloud-server,xx621998xx/server,andreas-p/nextcloud-server,pmattern/server,andreas-p/nextcloud-server,andreas-p/nextcloud-server,sharidas/core,Ardinis/server,cernbox/core,lrytz/core,Ardinis/server,sharidas/core,andreas-p/nextcloud-server,lrytz/core,whitekiba/server,bluelml/core,pollopolea/core,pollopolea/core,Ardinis/server,IljaN/core,nextcloud/server,whitekiba/server,pixelipo/server,nextcloud/server,IljaN/core,endsguy/server,Ardinis/server,jbicha/server,xx621998xx/server,lrytz/core,pollopolea/core,pollopolea/core,pmattern/server,pollopolea/core,bluelml/core,bluelml/core,Ardinis/server,michaelletzgus/nextcloud-server,owncloud/core,jbicha/server,jbicha/server,pmattern/server