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Subject[PATCH 6/6] osdblk: Adjust queue limits to lower device's limits
Date
call blk_queue_stack_limits() to copy queue limits from
the underline osd scsi_device. This is absolutely needed
because osdblk cannot sleep when allocating a lower-request and
therefore cannot be bouncing.

TODO: Dynamic changes of limits to the lower device queue
will not reflect in the upper driver

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
---
drivers/block/osdblk.c | 7 +++++++
1 files changed, 7 insertions(+), 0 deletions(-)
diff --git a/drivers/block/osdblk.c b/drivers/block/osdblk.c
index e829360..b07e154 100644
--- a/drivers/block/osdblk.c
+++ b/drivers/block/osdblk.c
@@ -66,6 +66,7 @@
#include <scsi/osd_initiator.h>
#include <scsi/osd_attributes.h>
#include <scsi/osd_sec.h>
+#include <scsi/scsi_device.h>

#define DRV_NAME "osdblk"
#define PFX DRV_NAME ": "
@@ -410,6 +411,12 @@ static int osdblk_init_disk(struct osdblk_device *osdev)
return rc;
}

+ /* Set our limits to the lower device limits, because osdblk cannot
+ * sleep when allocating a lower-request and therefore cannot be
+ * bouncing.
+ */
+ blk_queue_stack_limits(q, osd_request_queue(osdev->osd));
+
blk_queue_prep_rq(q, blk_queue_start_tag);
blk_queue_ordered(q, QUEUE_ORDERED_DRAIN_FLUSH, osdblk_prepare_flush);

--
1.6.2.1


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