pfs_visible(). The recursion does not cause deadlock because the sx
implementation does not prefer exclusive waiters over the shared, but
this is an implementation detail.
Reported by: pho, Matthew Bryan <matthew.bryan@isilon.com>
Reviewed by: jhb
Tested by: pho
Approved by: des (pseudofs maintainer)
Sponsored by: The FreeBSD Foundation
MFC after: 2 weeks