tree fa0f9d67f5dc0e39a5bad80e80a18ac1d4eb9a86
parent b7392d2247cfe6771f95d256374f1a8e6a6f48d6
author Martin K. Petersen <martin.petersen@oracle.com> 1417787883 -0500
committer Christoph Hellwig <hch@lst.de> 1419942638 +0100

sd: tweak discard heuristics to work around QEMU SCSI issue

7985090aa020 changed the discard heuristics to give preference to the
WRITE SAME commands that (unlike UNMAP) guarantee deterministic results.

Ming Lei discovered that QEMU SCSI's WRITE SAME implementation
internally relied on limits that were only communicated for the UNMAP
case. And therefore discard commands backed by WRITE SAME would fail.

Tweak the heuristics so we still pick UNMAP in the LBPRZ=0 case and only
prefer the WRITE SAME variants if the device has the LBPRZ flag set.

Reported-by: Ming Lei <ming.lei@canonical.com>
Tested-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>