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authorChandra Seetharaman <sekharan@us.ibm.com>2009-08-03 12:42:39 -0700
committerJames Bottomley <James.Bottomley@suse.de>2009-08-22 17:52:14 -0500
commit14d9cb5f760c86b3a8f686909465982231c06627 (patch)
tree5846e1152a7b00343ed3bf894b84376ae4421d3c /drivers/scsi
parent18ee70c9d7b2dcd312a1f8c6536841e7c0fea5ca (diff)
[SCSI] scsi_dh: Provide set_params interface in emc device handler
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. Reported-by: Eddie Williams <Eddie.Williams@steeleye.com> Signed-off-by: Chandra Seetharaman <sekharan@us.ibm.com> Tested-by: Eddie Williams <Eddie.Williams@steeleye.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
Diffstat (limited to 'drivers/scsi')
-rw-r--r--drivers/scsi/device_handler/scsi_dh_emc.c59
1 files changed, 56 insertions, 3 deletions
diff --git a/drivers/scsi/device_handler/scsi_dh_emc.c b/drivers/scsi/device_handler/scsi_dh_emc.c
index 0e572d2c5b0..0cffe84976f 100644
--- a/drivers/scsi/device_handler/scsi_dh_emc.c
+++ b/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;
+ const 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"},
@@ -581,11 +636,9 @@ static struct scsi_device_handler clariion_dh = {
.check_sense = clariion_check_sense,
.activate = clariion_activate,
.prep_fn = clariion_prep_fn,
+ .set_params = clariion_set_params,
};
-/*
- * TODO: need some interface so we can set trespass values
- */
static int clariion_bus_attach(struct scsi_device *sdev)
{
struct scsi_dh_data *scsi_dh_data;