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Commit 6bb5e6e7 authored by Akinobu Mita's avatar Akinobu Mita Committed by Christoph Hellwig
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scsi_debug: allow huge transfer length for read/write commands 



This change enables to test read/write commands with huge transfer
length such as 1GB.  For example:

	# modprobe scsi_debug dev_size_mb=1024 clustering=1 opts=1
	# cat /sys/block/$DEV/queue/max_hw_sectors_kb > \
		/sys/block/$DEV/queue/max_sectors_kb
	# fio --name=test --rw=write --bs=1g --size=1g --filename=/dev/$DEV \
		--mem=mmaphuge  --direct=1

The data type of max_sectors in scsi_host_template has been extended
to unsigned int by the previous change.  So we can increase it from
0xffff to 0xffffffff to allow such huge transfer length.

Also, this increases sg_tablesize and max_segment_size, otherwise the
maximum transfer length is limited to 64MB.
(sg_tablesize * max_segment_size = 256 * 256KB)

Signed-off-by: default avatarAkinobu Mita <akinobu.mita@gmail.com>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
Acked by: Douglas Gilbert <dgilbert@interlog.com>
Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
parent 8ed5a4d2

drivers/scsi/scsi_debug.c

+3 −3
Original line number Diff line number Diff line
@@ -2484,7 +2484,7 @@ static int scsi_debug_slave_configure(struct scsi_device *sdp) 
	if (sdp->host->cmd_per_lun)

		scsi_adjust_queue_depth(sdp, SDEBUG_TAGGED_QUEUING,

					sdp->host->cmd_per_lun);

	blk_queue_max_segment_size(sdp->request_queue, 256 * 1024);

	blk_queue_max_segment_size(sdp->request_queue, -1U);

	if (scsi_debug_no_uld)

		sdp->no_uld_attach = 1;

	return 0;
@@ -3946,9 +3946,9 @@ static struct scsi_host_template sdebug_driver_template = { 
	.bios_param =		scsi_debug_biosparam,

	.can_queue =		SCSI_DEBUG_CANQUEUE,

	.this_id =		7,

	.sg_tablesize =		256,

	.sg_tablesize =		SCSI_MAX_SG_CHAIN_SEGMENTS,

	.cmd_per_lun =		16,

	.max_sectors =		0xffff,

	.max_sectors =		-1U,

	.use_clustering = 	DISABLE_CLUSTERING,

	.module =		THIS_MODULE,

};