Handle the parameters provided by user thru multipath.
This handler expects only 2 parameters and their value can either be 0 or 1.
This code originates from the old dm-emc.c file. Appropriate changes have
been made to make it work in the new design.
Signed-off-by: Chandra Seetharaman <sekharan@xxxxxxxxxx>
---
drivers/scsi/device_handler/scsi_dh_emc.c | 56 ++++++++++++++++++++++++++++++
1 file changed, 56 insertions(+)
Index: linux-2.6.31-rc1/drivers/scsi/device_handler/scsi_dh_emc.c
===================================================================
--- linux-2.6.31-rc1.orig/drivers/scsi/device_handler/scsi_dh_emc.c
+++ linux-2.6.31-rc1/drivers/scsi/device_handler/scsi_dh_emc.c
@@ -561,6 +561,61 @@ done:
return result;
}
+/*
+ * params - parameters in the following format
+ * "no_of_params\0param1\0param2\0param3\0...\0"
+ * for example, string for 2 parameters with value 10 and 21
+ * is specified as "2\010\021\0".
+ */
+static int clariion_set_params(struct scsi_device *sdev, const char *params)
+{
+ struct clariion_dh_data *csdev = get_clariion_data(sdev);
+ unsigned int hr = 0, st = 0, argc;
+ char *p = params;
+ int result = SCSI_DH_OK;
+
+ if ((sscanf(params, "%u", &argc) != 1) || (argc != 2))
+ return -EINVAL;
+
+ while (*p++)
+ ;
+ if ((sscanf(p, "%u", &st) != 1) || (st > 1))
+ return -EINVAL;
+
+ while (*p++)
+ ;
+ if ((sscanf(p, "%u", &hr) != 1) || (hr > 1))
+ return -EINVAL;
+
+ if (st)
+ csdev->flags |= CLARIION_SHORT_TRESPASS;
+ else
+ csdev->flags &= ~CLARIION_SHORT_TRESPASS;
+
+ if (hr)
+ csdev->flags |= CLARIION_HONOR_RESERVATIONS;
+ else
+ csdev->flags &= ~CLARIION_HONOR_RESERVATIONS;
+
+ /*
+ * If this path is owned, we have to send a trespass command
+ * with the new parameters. If not, simply return. Next trespass
+ * command would use the parameters.
+ */
+ if (csdev->lun_state != CLARIION_LUN_OWNED)
+ goto done;
+
+ csdev->lun_state = CLARIION_LUN_UNINITIALIZED;
+ result = send_trespass_cmd(sdev, csdev);
+ if (result != SCSI_DH_OK)
+ goto done;
+
+ /* Update status */
+ result = clariion_send_inquiry(sdev, csdev);
+
+done:
+ return result;
+}
static const struct scsi_dh_devlist clariion_dev_list[] = {
{"DGC", "RAID"},
@@ -581,6 +636,7 @@ static struct scsi_device_handler clarii
.check_sense = clariion_check_sense,
.activate = clariion_activate,
.prep_fn = clariion_prep_fn,
+ .set_params = clariion_set_params,
};
/*
--
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