linux-kernel - [PATCH 6/6] osdblk: Adjust queue limits to lower device's limits

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Message-Id: <1245254872-8717-1-git-send-email-bharrosh@panasas.com>
Date:	Wed, 17 Jun 2009 19:07:52 +0300
From:	Boaz Harrosh <bharrosh@...asas.com>
To:	Jeff Garzik <jeff@...zik.org>, open-osd <osd-dev@...n-osd.org>
Cc:	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: [PATCH 6/6] osdblk: Adjust queue limits to lower device's limits

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@...asas.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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