kern/45215: physio/directio doesn't dirty pages

[yamt%NetBSD.org@localhost]

>Number:         45215
>Category:       kern
>Synopsis:       physio/directio doesn't dirty pages
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Aug 05 00:35:00 +0000 2011
>Originator:     YAMAMOTO Takashi
>Release:        NetBSD current
>Organization:
        
>Environment:
>Description:
        physio/directio doesn't dirty the userland buffer pages.
        if pages are cleaned by other thread immediately after our thread
        uvm_vslock pages, the modification can be lost.
>How-To-Repeat:
>Fix:
        

>Unformatted: