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The rationale is similar to the above mode sense response interception: this is practically the only channel to communicate restraints from elsewhere such as host and block driver. The scsi bus we attach onto can have a larger max xfer len than what is accepted by the host file system (guarding between the host scsi LUN and QEMU), in which case the SG_IO we generate would get -EINVAL. Signed-off-by: Fam Zheng <famz@redhat.com> Message-Id: <1464243305-10661-3-git-send-email-famz@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>