virtio-blk: clamp max_segments when indirect descriptors are disabled - #1140
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When VIRTIO_RING_F_INDIRECT_DESC is not negotiated by the host, every scatter-gather segment in a request must consume a physical slot in the virtqueue ring. If the host does not advertise VIRTIO_BLK_F_SEG_MAX and provides a small virtqueue (e.g. 128 descriptors on QNX Hypervisor), the block layer defaults max_segments to BLK_MAX_SEGMENTS (1024). When a multi-page compound bio arrives from the page cache, virtqueue_add_split() rejects the request with -ENOSPC and triggers: WARNING: at drivers/virtio/virtio_ring.c:1493 virtqueue_add+... WARN_ON_ONCE(total_sg > vq->split.vring.num && !vq->indirect); This permanently wedges the blk-mq queue and blocks all subsequent disk I/O in uninterruptible sleep (D state). Automatically clamp sg_elems to (ring_size - 2) when indirect descriptors are disabled. Signed-off-by: Sergii Ushakov <sergiiushakov@google.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de>
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Pull request for series with
subject: virtio-blk: clamp max_segments when indirect descriptors are disabled
version: 1
url: https://patchwork.kernel.org/project/linux-block/list/?series=1146019