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authorRusty Russell <rusty@rustcorp.com.au>2008-12-30 09:26:04 -0600
committerRusty Russell <rusty@rustcorp.com.au>2008-12-30 09:26:05 +1030
commit4b7f7e2049956f6e946ad56c1ee093e7bab74da9 (patch)
tree23e307f720b8fd42465d5ec92da6b4205b6534a0
parent1b4aa2faeca1b9922033daf2475b6fc13b0ffea6 (diff)
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 <rusty@rustcorp.com.au>
-rw-r--r--drivers/block/virtio_blk.c5
1 files changed, 5 insertions, 0 deletions
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),