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[SCSI] zfcp: Add allow_lun_scan module parameter 

The zfcpdump tool requires a method to attach exactly one LUN. The
easiest way to achieve this is to add a new zfcp module parameter.
When allow_lun_scan is set to "false", zfcp only accepts LUNs that
have been configured through the unit_add sysfs interface.

Reviewed-by: Swen Schillig <swen@vnet.ibm.com>
Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
This commit is contained in:
Christof Schmitt 2010-12-08 17:30:46 +01:00 committed by James Bottomley
parent 51780d2c38
commit 0d81b4e8dc
1 changed files with 6 additions and 1 deletions
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7
drivers/s390/scsi/zfcp_scsi.c
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@ -30,6 +30,10 @@ module_param_named(dif, enable_dif, bool, 0600);
MODULE_PARM_DESC(dif, "Enable DIF/DIX data integrity support");
#endif
static bool allow_lun_scan = 1;
module_param(allow_lun_scan, bool, 0600);
MODULE_PARM_DESC(allow_lun_scan, "For NPIV, scan and attach all storage LUNs");
static int zfcp_scsi_change_queue_depth(struct scsi_device *sdev, int depth,
int reason)
{
@ -130,6 +134,7 @@ static int zfcp_scsi_slave_alloc(struct scsi_device *sdev)
struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
struct zfcp_port *port;
struct zfcp_unit *unit;
int npiv = adapter->connection_features & FSF_FEATURE_NPIV_MODE;
port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
if (!port)
@ -139,7 +144,7 @@ static int zfcp_scsi_slave_alloc(struct scsi_device *sdev)
if (unit)
put_device(&unit->dev);
if (!unit && !(adapter->connection_features & FSF_FEATURE_NPIV_MODE)) {
if (!unit && !(allow_lun_scan && npiv)) {
put_device(&port->dev);
return -ENXIO;
}