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Liu Yuan authored
When running qcow2 over sheepdog, we might meet following problem qemu-system-x86_64: shrinking is not supported And cause IO errors to Guest. This is because we abuse bs->total_sectors, which is manipulated by generic block layer and race with sheepdog code. We should directly check if offset > vdi_size to dynamically enlarge the volume instead of 'offset > bs->total_sectors', which will cause problem when following case happens: vdi_size > offset > bs->total_sectors # then trigger sd_truncate() to shrink the volume wrongly. Cc: qemu-devel@nongnu.org Cc: Kevin Wolf <kwolf@redhat.com> Cc: Stefan Hajnoczi <stefanha@redhat.com> Reported-by: Hadrien KOHL <hadrien.kohl@gmail.com> Signed-off-by: Liu Yuan <namei.unix@gmail.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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