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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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