ac34145005
The r255797 was: Increase the chance of the buffer write from the bufdaemon helper context to succeed. If the locked vnode which owns the buffer to be written is shared locked, try the non-blocking upgrade of the lock to exclusive. PR: kern/178997 Reported and tested by: Klaus Weber <fbsd-bugs-2013-1@unix-admin.de> Sponsored by: The FreeBSD Foundation MFC after: 1 week Approved by: re (glebius)