block/mirror: Improve progress report
Instead of taking the total length of the block device as the block job's length, use the number of dirty sectors. The progress is now the number of sectors mirrored to the target block device. Note that this may result in the job's length increasing during operation, which is however in fact desirable. Signed-off-by: NMax Reitz <mreitz@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com> Reviewed-by: NKevin Wolf <kwolf@redhat.com> Message-id: 1414159063-25977-8-git-send-email-mreitz@redhat.com Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
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