[PATCH 2/5 UPDATED] virtio_blk: drop REQ_HARDBARRIER support
From: Tejun Heo <tj@kernel.org>
Date: 2010-08-19 15:14:21
Also in:
dm-devel, linux-fsdevel, linux-raid, linux-scsi, lkml
Remove now unused REQ_HARDBARRIER support. virtio_blk already supports REQ_FLUSH and the usefulness of REQ_FUA for virtio_blk is questionable at this point, so there's nothing else to do to support new REQ_FLUSH/FUA interface. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Michael S. Tsirkin <mst@redhat.com> Cc: Christoph Hellwig <hch@lst.de> --- REQ_FUA support dropped as suggested by Christoph. drivers/block/virtio_blk.c | 17 ++++------------- 1 file changed, 4 insertions(+), 13 deletions(-) Index: block/drivers/block/virtio_blk.c ===================================================================
--- block.orig/drivers/block/virtio_blk.c
+++ block/drivers/block/virtio_blk.c@@ -128,9 +128,6 @@ static bool do_req(struct request_queue } } - if (vbr->req->cmd_flags & REQ_HARDBARRIER) - vbr->out_hdr.type |= VIRTIO_BLK_T_BARRIER; - sg_set_buf(&vblk->sg[out++], &vbr->out_hdr, sizeof(vbr->out_hdr)); /*
@@ -388,13 +385,7 @@ static int __devinit virtblk_probe(struc vblk->disk->driverfs_dev = &vdev->dev; index++; - /* - * If the FLUSH feature is supported we do have support for - * flushing a volatile write cache on the host. Use that to - * implement write barrier support; otherwise, we must assume - * that the host does not perform any kind of volatile write - * caching. - */ + /* configure queue flush support */ if (virtio_has_feature(vdev, VIRTIO_BLK_F_FLUSH)) blk_queue_flush(q, REQ_FLUSH);
@@ -515,9 +506,9 @@ static const struct virtio_device_id id_ }; static unsigned int features[] = { - VIRTIO_BLK_F_BARRIER, VIRTIO_BLK_F_SEG_MAX, VIRTIO_BLK_F_SIZE_MAX, - VIRTIO_BLK_F_GEOMETRY, VIRTIO_BLK_F_RO, VIRTIO_BLK_F_BLK_SIZE, - VIRTIO_BLK_F_SCSI, VIRTIO_BLK_F_FLUSH, VIRTIO_BLK_F_TOPOLOGY + VIRTIO_BLK_F_SEG_MAX, VIRTIO_BLK_F_SIZE_MAX, VIRTIO_BLK_F_GEOMETRY, + VIRTIO_BLK_F_RO, VIRTIO_BLK_F_BLK_SIZE, VIRTIO_BLK_F_SCSI, + VIRTIO_BLK_F_FLUSH, VIRTIO_BLK_F_TOPOLOGY }; /*