Matthew Dillon ff359f84c9 Fix a deadlock between msync(..., MS_INVALIDATE) and vm_fault. The
invalidation code cannot wait for paging to complete while holding a
    vnode lock, so we don't wait.  Instead we simply allow the lower level
    code to simply block on any busy pages it encounters.  I think Yahoo
    may be the only entity in the entire world that actually uses this
    msync feature :-).

Bug reported by:  Paul Saab <paul@mu.org>
2000-01-21 20:17:01 +00:00
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