iotests/081: Test rewrite-corrupted without WRITE

Test what happens when a rewrite-corrupted quorum node performs such a
rewrite, while there is no parent that has taken the WRITE permission.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Message-Id: <20201113211718.261671-4-mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

tests/qemu-iotests/081

@@ -42,6 +42,7 @@ _supported_fmt raw
 _supported_proto file
 _supported_os Linux
 _require_drivers quorum
+_require_devices virtio-scsi
 
 do_run_qemu()
 {
@@ -155,6 +156,59 @@ echo "== checking that quorum has corrected the corrupted file =="
 
 $QEMU_IO -c "read -P 0x32 0 $size" "$TEST_DIR/2.raw" | _filter_qemu_io
 
+echo
+echo "== using quorum rewrite corrupted mode without WRITE permission =="
+
+# The same as above, but this time, do it on a quorum node whose only
+# parent will not take the WRITE permission
+
+echo '-- corrupting --'
+# Only corrupt a portion: The guest device (scsi-hd on virtio-scsi)
+# will read some data (looking for a partition table to guess the
+# disk's geometry), which would trigger a quorum mismatch if the
+# beginning of the image was corrupted.  The subsequent
+# QUORUM_REPORT_BAD event would be suppressed (because at that point,
+# there cannot have been a qmp_capabilities on the monitor).  Because
+# that event is rate-limited, the next QUORUM_REPORT_BAD that happens
+# thanks to our qemu-io read (which should trigger a mismatch) would
+# then be delayed past the VM quit and not appear in the output.
+# So we keep the first 1M intact to see a QUORUM_REPORT_BAD resulting
+# from the qemu-io invocation.
+$QEMU_IO -c "write -P 0x42 1M 1M" "$TEST_DIR/2.raw" | _filter_qemu_io
+
+# Fix the corruption (on a read-only quorum node, i.e. without taking
+# the WRITE permission on it -- its child nodes need to be R/W OTOH,
+# so that rewrite-corrupted works)
+echo
+echo '-- running quorum --'
+run_qemu \
+    -blockdev file,node-name=file1,filename="$TEST_DIR/1.raw" \
+    -blockdev file,node-name=file2,filename="$TEST_DIR/2.raw" \
+    -blockdev file,node-name=file3,filename="$TEST_DIR/3.raw" \
+    -blockdev '{
+        "driver": "quorum",
+        "node-name": "quorum",
+        "read-only": true,
+        "vote-threshold": 2,
+        "rewrite-corrupted": true,
+        "children": [ "file1", "file2", "file3" ]
+    }' \
+    -device virtio-scsi,id=scsi \
+    -device scsi-hd,id=quorum-drive,bus=scsi.0,drive=quorum \
+    <<EOF
+{ "execute": "qmp_capabilities" }
+{
+    "execute": "human-monitor-command",
+    "arguments": {
+        "command-line": 'qemu-io -d quorum-drive "read -P 0x32 0 $size"'
+    }
+}
+{ "execute": "quit" }
+EOF
+
+echo '-- checking that the image has been corrected --'
+$QEMU_IO -c "read -P 0x32 0 $size" "$TEST_DIR/2.raw" | _filter_qemu_io
+
 echo
 echo "== breaking quorum =="
 

tests/qemu-iotests/081.out

@@ -47,6 +47,33 @@ read 10485760/10485760 bytes at offset 0
 read 10485760/10485760 bytes at offset 0
 10 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 
+== using quorum rewrite corrupted mode without WRITE permission ==
+-- corrupting --
+wrote 1048576/1048576 bytes at offset 1048576
+1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+-- running quorum --
+Testing: -blockdev file,node-name=file1,filename=TEST_DIR/1.IMGFMT -blockdev file,node-name=file2,filename=TEST_DIR/2.IMGFMT -blockdev file,node-name=file3,filename=TEST_DIR/3.IMGFMT -blockdev {
+        "driver": "quorum",
+        "node-name": "quorum",
+        "read-only": true,
+        "vote-threshold": 2,
+        "rewrite-corrupted": true,
+        "children": [ "file1", "file2", "file3" ]
+    } -device virtio-scsi,id=scsi -device scsi-hd,id=quorum-drive,bus=scsi.0,drive=quorum
+QMP_VERSION
+{"return": {}}
+{"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": "QUORUM_REPORT_BAD", "data": {"node-name": "file2", "sectors-count": 20480, "sector-num": 0, "type": "read"}}
+read 10485760/10485760 bytes at offset 0
+10 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+{"return": ""}
+{"return": {}}
+{"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": "SHUTDOWN", "data": {"guest": false, "reason": "host-qmp-quit"}}
+
+-- checking that the image has been corrected --
+read 10485760/10485760 bytes at offset 0
+10 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
 == breaking quorum ==
 wrote 10485760/10485760 bytes at offset 0
 10 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)