tree 266171323bd7c5dfc433efd70ca19aafc891598c
parent 44cc76f2d154aa24340354b4711a0fe7f8f08adc
author Swen Schillig <swen@vnet.ibm.com> 1222857737 +0200
committer James Bottomley <James.Bottomley@HansenPartnership.com> 1223053913 -0500

[SCSI] zfcp: attach and release SAN nameserver port on demand

Changing the zfcp behaviour from always having the nameserver port
open to an on-demand strategy.  This strategy reduces the use of
limited resources like port connections. The patch provides a common
infrastructure which could be used for all WKA ports in future.

Also reduce the number of nameserver lookups by changing the zfcp
behaviour of always querying the nameserver for the corresponding
destination ID of the remote port.  If the destination ID has changed
during the reopen process we will be informed and then trigger a
nameserver query on demand.

Signed-off-by: Swen Schillig <swen@vnet.ibm.com>
Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>