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authorAkinobu Mita <akinobu.mita@gmail.com>2014-06-02 22:56:49 +0900
committerChristoph Hellwig <hch@lst.de>2014-07-17 22:07:31 +0200
commit6bb5e6e772f5f71413e290eb9c6a475e9a6d39e2 (patch)
tree3bba23e0ace91ecf9aac6404c13720bc8a7f813e /drivers/scsi/scsi_debug.c
parent8ed5a4d2f7d8b296a22fed7ec2b543c0500d13be (diff)
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: Akinobu Mita <akinobu.mita@gmail.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> Acked by: Douglas Gilbert <dgilbert@interlog.com> Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'drivers/scsi/scsi_debug.c')
-rw-r--r--drivers/scsi/scsi_debug.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
index 1328a2621070..c4ad52c2ec69 100644
--- a/drivers/scsi/scsi_debug.c
+++ b/drivers/scsi/scsi_debug.c
@@ -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,
};