iotests: Add test for external image truncation

It should not be happening, but it is possible to truncate an image
outside of qemu while qemu is running (or any of the qemu tools using
the block layer. raw_co_get_block_status() should not break then.

While touching this test, replace the existing "truncate" invocation by
"$QEMU_IMG convert -f raw".
Signed-off-by: NMax Reitz <mreitz@redhat.com>
Reviewed-by: NKevin Wolf <kwolf@redhat.com>
Reviewed-by: NEric Blake <eblake@redhat.com>
Message-id: 1414148280-17949-4-git-send-email-mreitz@redhat.com
Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>

tests/qemu-iotests/102

@@ -34,9 +34,10 @@ _cleanup()
 }
 trap "_cleanup; exit \$status" 0 1 2 3 15
 
-# get standard environment, filters and checks
+# get standard environment, filters and qemu instance handling
 . ./common.rc
 . ./common.filter
+. ./common.qemu
 
 _supported_fmt qcow2
 _supported_proto file
@@ -53,11 +54,27 @@ _make_test_img $IMG_SIZE
 $QEMU_IO -c 'write 0 64k' "$TEST_IMG" | _filter_qemu_io
 # Remove data cluster from image (first cluster: image header, second: reftable,
 # third: refblock, fourth: L1 table, fifth: L2 table)
-truncate -s $((5 * 64 * 1024)) "$TEST_IMG"
+$QEMU_IMG resize -f raw "$TEST_IMG" $((5 * 64 * 1024))
 
 $QEMU_IO -c map "$TEST_IMG"
 $QEMU_IMG map "$TEST_IMG"
 
+echo
+echo '=== Testing map on an image file truncated outside of qemu ==='
+echo
+
+# Same as above, only now we concurrently truncate and map the image
+_make_test_img $IMG_SIZE
+$QEMU_IO -c 'write 0 64k' "$TEST_IMG" | _filter_qemu_io
+
+qemu_comm_method=monitor _launch_qemu -drive if=none,file="$TEST_IMG",id=drv0
+
+$QEMU_IMG resize -f raw "$TEST_IMG" $((5 * 64 * 1024))
+
+_send_qemu_cmd $QEMU_HANDLE 'qemu-io drv0 map' 'allocated' \
+    | sed -e 's/^(qemu).*qemu-io drv0 map...$/(qemu) qemu-io drv0 map/'
+_send_qemu_cmd $QEMU_HANDLE 'quit' ''
+
 # success, all done
 echo '*** done'
 rm -f $seq.full

tests/qemu-iotests/102.out

@@ -5,6 +5,17 @@ QA output created by 102
 Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=65536
 wrote 65536/65536 bytes at offset 0
 64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+Image resized.
 [                       0]      128/     128 sectors     allocated at offset 0 bytes (1)
 Offset          Length          Mapped to       File
+
+=== Testing map on an image file truncated outside of qemu ===
+
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=65536
+wrote 65536/65536 bytes at offset 0
+64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+Image resized.
+QEMU X.Y.Z monitor - type 'help' for more information
+(qemu) qemu-io drv0 map
+[                       0]      128/     128 sectors     allocated at offset 0 bytes (1)
 *** done