target: Implement Block Device Characteristics VPD page
Implement page B1h, Block Device Characteristics, so that we can report
a medium rotation rate of 1 (non-rotating / solid state) if the
is_nonrot device attribute is set; we update the iblock backend to set
this attribute if the underlying Linux block device has its nonrot
flag set.
Signed-off-by: Roland Dreier <roland@purestorage.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
diff --git a/drivers/target/target_core_device.c b/drivers/target/target_core_device.c
index f13e294..440e6b6 100644
--- a/drivers/target/target_core_device.c
+++ b/drivers/target/target_core_device.c
@@ -853,6 +853,7 @@
dev->se_sub_dev->se_dev_attrib.emulate_reservations = DA_EMULATE_RESERVATIONS;
dev->se_sub_dev->se_dev_attrib.emulate_alua = DA_EMULATE_ALUA;
dev->se_sub_dev->se_dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;
+ dev->se_sub_dev->se_dev_attrib.is_nonrot = DA_IS_NONROT;
/*
* The TPU=1 and TPWS=1 settings will be set in TCM/IBLOCK
* iblock_create_virtdevice() from struct queue_limits values
@@ -1117,6 +1118,18 @@
return 0;
}
+int se_dev_set_is_nonrot(struct se_device *dev, int flag)
+{
+ if ((flag != 0) && (flag != 1)) {
+ printk(KERN_ERR "Illegal value %d\n", flag);
+ return -EINVAL;
+ }
+ dev->se_sub_dev->se_dev_attrib.is_nonrot = flag;
+ printk(KERN_INFO "dev[%p]: SE Device is_nonrot bit: %d\n",
+ dev, flag);
+ return 0;
+}
+
/*
* Note, this can only be called on unexported SE Device Object.
*/