Fix a problem for file systems that don't implement VOP_BMAP() operation.

The problem is this: vm_fault_additional_pages() calls vm_pager_has_page(),
which calls vnode_pager_haspage(). Now when VOP_BMAP() returns an error (eg.
EOPNOTSUPP), vnode_pager_haspage() returns TRUE without initializing 'before'
and 'after' arguments, so we have some accidental values there. This bascially
was causing this condition to be meet:

	if ((rahead + rbehind) >
	    ((cnt.v_free_count + cnt.v_cache_count) - cnt.v_free_reserved)) {
		pagedaemon_wakeup();
		[...]
	}

(we have some random values in rahead and rbehind variables)

I'm not entirely sure this is the right fix, maybe we should just return FALSE
in vnode_pager_haspage() when VOP_BMAP() fails?

alc@ knows about this problem, maybe he will be able to come up with a better
fix if this is not the right one.

0 files changed, 0 insertions, 0 deletions