K 10
svn:author
V 3
pjd
K 8
svn:date
V 27
2011-09-28T13:08:51.921299Z
K 7
svn:log
V 367
After every activemap change flush disk's write cache, so that write
reordering won't make the actual write to be committed before marking
the coresponding extent as dirty.

It can be disabled in configuration file.

If BIO_FLUSH is not supported by the underlying file system we log a warning
and never send BIO_FLUSH again to that GEOM provider.

MFC after:	3 days

END