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 <[EMAIL PROTECTED]>
diff -r 446171198334 drivers/block/virtio_blk.c
--- a/drivers/block/virtio_blk.c Mon Nov 17 08:34:57 2008 +1030
+++ b/drivers/block/virtio_blk.c Mon Nov 17 17:16:35 2008 +1030
@@ -277,6 +277,9 @@
}
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 @@
&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),
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