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scsi: disable automatic target scan

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On larger installations it is useful to disable automatic LUN scanning,
and only add the required LUNs via udev rules.  This can speed up bootup
dramatically.

This patch introduces a new scan module parameter value 'manual', which
works like 'none', but can be overridden by setting the 'rescan' value
from scsi_scan_target to 'SCSI_SCAN_MANUAL'.  And it updates all
relevant callers to set the 'rescan' value to 'SCSI_SCAN_MANUAL' if
invoked via the 'scan' option in sysfs.

Signed-off-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Ewan D. Milne <emilne@redhat.com>
Tested-by: Laurence Oberman <loberman@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Hannes Reinecke
2016-03-17 08:39:45 +01:00
committed by Martin K. Petersen
parent 216fad9138
commit 1d64508810
12 changed files with 60 additions and 28 deletions
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drivers/scsi/scsi_transport_sas.c
+4 -3
View File
@@ -1614,7 +1614,8 @@ int sas_rphy_add(struct sas_rphy *rphy)
else
lun = 0;
scsi_scan_target(&rphy->dev, 0, rphy->scsi_target_id, lun, 0);
scsi_scan_target(&rphy->dev, 0, rphy->scsi_target_id, lun,
SCSI_SCAN_INITIAL);
}
return 0;
@@ -1739,8 +1740,8 @@ static int sas_user_scan(struct Scsi_Host *shost, uint channel,
if ((channel == SCAN_WILD_CARD || channel == 0) &&
(id == SCAN_WILD_CARD || id == rphy->scsi_target_id)) {
scsi_scan_target(&rphy->dev, 0,
rphy->scsi_target_id, lun, 1);
scsi_scan_target(&rphy->dev, 0, rphy->scsi_target_id,
lun, SCSI_SCAN_MANUAL);
}
}
mutex_unlock(&sas_host->lock);