qemu/tests/qemu-iotests/268.out

QA output created by 268

== Required alignment larger than cluster size ==
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1048576
wrote 512/512 bytes at offset 0
512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
*** done
block: Reject misaligned write requests with BDRV_REQ_NO_FALLBACK The BDRV_REQ_NO_FALLBACK flag means that an operation should only be performed if it can be offloaded or otherwise performed efficiently. However a misaligned write request requires a RMW so we should return an error and let the caller decide how to proceed. This hits an assertion since commit c8bb23cbdb if the required alignment is larger than the cluster size: qemu-img create -f qcow2 -o cluster_size=2k img.qcow2 4G qemu-io -c "open -o driver=qcow2,file.align=4k blkdebug::img.qcow2" \ -c 'write 0 512' qemu-io: block/io.c:1127: bdrv_driver_pwritev: Assertion `!(flags & BDRV_REQ_NO_FALLBACK)' failed. Aborted The reason is that when writing to an unallocated cluster we try to skip the copy-on-write part and zeroize it using BDRV_REQ_NO_FALLBACK instead, resulting in a write request that is too small (2KB cluster size vs 4KB required alignment). Signed-off-by: Alberto Garcia <berto@igalia.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com> 2019-10-14 11:15:45 +03:00			`QA output created by 268`

			`== Required alignment larger than cluster size ==`
			`Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1048576`
			`wrote 512/512 bytes at offset 0`
			`512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)`
			`*** done`