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| author | Akinobu Mita <akinobu.mita@gmail.com> | 2014-06-02 15:56:49 +0200 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2014-07-17 22:07:31 +0200 |
| commit | 6bb5e6e772f5f71413e290eb9c6a475e9a6d39e2 (patch) | |
| tree | 3bba23e0ace91ecf9aac6404c13720bc8a7f813e /drivers/scsi/scsi_debug.c | |
| parent | scsi: increase upper limit for max_sectors (diff) | |
| download | linux-6bb5e6e772f5f71413e290eb9c6a475e9a6d39e2.tar.xz linux-6bb5e6e772f5f71413e290eb9c6a475e9a6d39e2.zip | |
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.c | 6 |
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, }; |