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OpenCloudOS-Kernel
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Staging: hv: storvsc: Disable clustering 

Disable clustering, since the host side on Hyper-V requires that
each I/O element not exceed the page size. As part of this
cleanup, get rid of the function to merge bvecs, as the primary
reason for this function was to avoid having an element exceed
the page size.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
K. Y. Srinivasan 2011-12-01 04:59:16 -08:00 committed by Greg Kroah-Hartman
parent d426b2e3d9
commit 039db52de9
1 changed files with 1 additions and 17 deletions
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18
drivers/staging/hv/storvsc_drv.c
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@ -798,13 +798,6 @@ static int storvsc_device_alloc(struct scsi_device *sdevice)
return 0;
}
static int storvsc_merge_bvec(struct request_queue *q,
struct bvec_merge_data *bmd, struct bio_vec *bvec)
{
/* checking done by caller. */
return bvec->bv_len;
}
static int storvsc_device_configure(struct scsi_device *sdevice)
{
scsi_adjust_queue_depth(sdevice, MSG_SIMPLE_TAG,
@ -812,8 +805,6 @@ static int storvsc_device_configure(struct scsi_device *sdevice)
blk_queue_max_segment_size(sdevice->request_queue, PAGE_SIZE);
blk_queue_merge_bvec(sdevice->request_queue, storvsc_merge_bvec);
blk_queue_bounce_limit(sdevice->request_queue, BLK_BOUNCE_ANY);
return 0;
@ -1375,14 +1366,7 @@ static struct scsi_host_template scsi_driver = {
/* no use setting to 0 since ll_blk_rw reset it to 1 */
/* currently 32 */
.sg_tablesize = MAX_MULTIPAGE_BUFFER_COUNT,
/*
* ENABLE_CLUSTERING allows mutiple physically contig bio_vecs to merge
* into 1 sg element. If set, we must limit the max_segment_size to
* PAGE_SIZE, otherwise we may get 1 sg element that represents
* multiple
*/
/* physically contig pfns (ie sg[x].length > PAGE_SIZE). */
.use_clustering = ENABLE_CLUSTERING,
.use_clustering = DISABLE_CLUSTERING,
/* Make sure we dont get a sg segment crosses a page boundary */
.dma_boundary = PAGE_SIZE-1,
};