vnode disk on smbfs can not survive temporary network failure

[Nikos Vassiliadis]

Hi all,

 A vnode disk on smbfs cannot survive a temporary failure.
Every subsequent read/write operation returns "Bad file descriptor"
which must likely will result in a panic if a filesystem is mounted
(not tested, just an assumption). This is not case with nfs, where
everything is fine after recovery. smbfs also works fine after reco-
very. Everything is OK, but the vnode disk. Should I file a PR?
Is it a GEOM issue?

Thanks in advance, Nikos