From 4b7f7e2049956f6e946ad56c1ee093e7bab74da9 Mon Sep 17 00:00:00 2001 From: Rusty Russell Date: Tue, 30 Dec 2008 09:26:04 -0600 Subject: virtio: set max_segment_size and max_sectors to infinite. Setting max_segment_size allows more than 64k per sg element, unless the host specified a limit. Setting max_sectors indicates that our max_hw_segments is the only limit. Signed-off-by: Rusty Russell --- drivers/block/virtio_blk.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c index 85d79a02d48..0e2ade648af 100644 --- a/drivers/block/virtio_blk.c +++ b/drivers/block/virtio_blk.c @@ -277,6 +277,9 @@ static int virtblk_probe(struct virtio_device *vdev) } set_capacity(vblk->disk, cap); + /* No real sector limit. */ + blk_queue_max_sectors(vblk->disk->queue, -1U); + /* Host can optionally specify maximum segment size and number of * segments. */ err = virtio_config_val(vdev, VIRTIO_BLK_F_SIZE_MAX, @@ -284,6 +287,8 @@ static int virtblk_probe(struct virtio_device *vdev) &v); if (!err) blk_queue_max_segment_size(vblk->disk->queue, v); + else + blk_queue_max_segment_size(vblk->disk->queue, -1UL); err = virtio_config_val(vdev, VIRTIO_BLK_F_SEG_MAX, offsetof(struct virtio_blk_config, seg_max), -- cgit v1.2.3