blockdev: blockdev-add error path fixes and tests

Encrypted images need a password before they can be used, and we don't want blockdev-add to create BDSes that aren't fully initialised. So for now simply forbid encrypted images; we can come back to it later if we need the functionality.

Signed-off-by Kevin Wolf <[email protected]>

---
 blockdev.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

blockdev.c +2 -1

index 357f760..561cb81 100644
@@ -2266,6 +2266,7 @@ void qmp_block_job_complete(const char *device, Error **errp)
 void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
 {
     QmpOutputVisitor *ov = qmp_output_visitor_new();
+    DriveInfo *dinfo;
     QObject *obj;
     QDict *qdict;
     Error *local_err = NULL;

@@ -2301,12 +2302,18 @@ void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
 
     qdict_flatten(qdict);
 
-    blockdev_init(NULL, qdict, &local_err);
+    dinfo = blockdev_init(NULL, qdict, &local_err);

blockdev.c +2 -0

+    }
+
 fail:
     qmp_output_visitor_cleanup(ov);

}

Signature · 1 line

1.8.1.4

Quoted 13 lines · Kevin Wolf

Encrypted images need a password before they can be used, and we don't want blockdev-add to create BDSes that aren't fully initialised. So for now simply forbid encrypted images; we can come back to it later if we need the functionality.

blockdev.c +1 -1

-    blockdev_init(NULL, qdict, &local_err);
+    dinfo = blockdev_init(NULL, qdict, &local_err);
     if (local_err) {
         error_propagate(errp, local_err);
         goto fail;
     }

blockdev.c void qmp_blockdev_add(BlockdevOptions *options, Error **errp) · line 2314

Quoted 5 lines

blockdev.c +4 -0

+    if (bdrv_key_required(dinfo->bdrv)) {
+        drive_uninit(dinfo);
+        error_setg(errp, "blockdev-add doesn't support encrypted devices");
 
+        goto fail;

This goto fail; is an extra the code will flow to fail anyway.

If aio=native, we check that cache.direct is set as well. If however cache wasn't specified at all, qemu just segfaulted.

The old condition didn't make any sense anyway because it effectively only checked for the default cache mode case, but not for an explicitly set cache.direct=off mode.

Signed-off-by Kevin Wolf <[email protected]>

---
 blockdev.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

blockdev.c +4 -2

index 561cb81..c3422a1 100644
@@ -2283,8 +2283,10 @@ void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
      *
      * For now, simply forbidding the combination for all drivers will do. */
     if (options->has_aio && options->aio == BLOCKDEV_AIO_OPTIONS_NATIVE) {
-        bool direct = options->cache->has_direct && options->cache->direct;
-        if (!options->has_cache && !direct) {
+        bool direct = options->has_cache &&
+                      options->cache->has_direct &&
+                      options->cache->direct;
+        if (!direct) {
             error_setg(errp, "aio=native requires cache.direct=true");
             goto fail;
         }

Signature · 1 line

1.8.1.4

If aio=native, we check that cache.direct is set as well. If however cache wasn't specified at all, qemu just segfaulted.

The old condition didn't make any sense anyway because it effectively only checked for the default cache mode case, but not for an explicitly set cache.direct=off mode.

Signed-off-by Kevin Wolf <[email protected]>

---
 blockdev.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

Signed-off-by Kevin Wolf <[email protected]>

---
 tests/qemu-iotests/087     | 122 +++++++++++++++++++++++++++++++++++++++++++++
 tests/qemu-iotests/087.out |  40 +++++++++++++++
 tests/qemu-iotests/group   |   1 +
 3 files changed, 163 insertions(+)
 create mode 100755 tests/qemu-iotests/087
 create mode 100644 tests/qemu-iotests/087.out

tests/qemu-iotests/087 new file +122 -0

new file mode 100755
index 0000000..53b6c43
@@ -0,0 +1,122 @@
+#!/bin/bash
+#
+# Test unsupported blockdev-add cases
+#
+# Copyright (C) 2014 Red Hat, Inc.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+# creator
[email protected]
+
+seq=`basename $0`
+echo "QA output created by $seq"
+
+here=`pwd`
+tmp=/tmp/$$
+status=1	# failure is the default!
+
+# get standard environment, filters and checks
+. ./common.rc
+. ./common.filter
+
+_supported_fmt qcow2
+_supported_proto file
+_supported_os Linux
+
+function do_run_qemu()
+{
+    echo Testing: "$@"
+    $QEMU -nographic -qmp stdio -serial none "$@"
+    echo
+}
+
+function run_qemu()
+{
+    do_run_qemu "$@" 2>&1 | _filter_testdir | _filter_qmp | sed -e 's/\("actual-size":\s*\)[0-9]\+/\1SIZE/g'
+}
+
+size=128M
+
+_make_test_img $size
+
+echo
+echo === Missing ID ===
+echo
+
+run_qemu <<EOF
+{ "execute": "qmp_capabilities" }
+{ "execute": "blockdev-add",
+  "arguments": {
+      "options": {
+        "driver": "$IMGFMT",
+        "file": {
+            "driver": "file",
+            "filename": "$TEST_IMG"
+        }
+      }
+    }
+  }
+{ "execute": "quit" }
+EOF
+
+echo
+echo === aio=native without O_DIRECT ===
+echo
+
+run_qemu <<EOF
+{ "execute": "qmp_capabilities" }
+{ "execute": "blockdev-add",
+  "arguments": {
+      "options": {
+        "driver": "$IMGFMT",
+        "id": "disk",
+        "aio": "native",
+        "file": {
+            "driver": "file",
+            "filename": "$TEST_IMG"
+        }
+      }
+    }
+  }
+{ "execute": "quit" }
+EOF
+
+echo
+echo === Encrypted image ===
+echo
+
+_make_test_img -o encryption=on $size
+run_qemu <<EOF
+{ "execute": "qmp_capabilities" }
+{ "execute": "blockdev-add",
+  "arguments": {
+      "options": {
+        "driver": "$IMGFMT",
+        "id": "disk",
+        "file": {
+            "driver": "file",
+            "filename": "$TEST_IMG"
+        }
+      }
+    }
+  }
+{ "execute": "quit" }
+EOF
+
+# success, all done
+echo "*** done"
+rm -f $seq.full
+status=0

tests/qemu-iotests/087.out new file +40 -0

new file mode 100644
index 0000000..b871032
@@ -0,0 +1,40 @@
+QA output created by 087
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=134217728 
+
+=== Missing ID ===
+
+Testing:
+QMP_VERSION
+{"return": {}}
+{"error": {"class": "GenericError", "desc": "Block device needs an ID"}}
+{"return": {}}
+{"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": "SHUTDOWN"}
+{"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": "DEVICE_TRAY_MOVED", "data": {"device": "ide1-cd0", "tray-open": true}}
+{"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": "DEVICE_TRAY_MOVED", "data": {"device": "floppy0", "tray-open": true}}
+
+
+=== aio=native without O_DIRECT ===
+
+Testing:
+QMP_VERSION
+{"return": {}}
+{"error": {"class": "GenericError", "desc": "aio=native requires cache.direct=true"}}
+{"return": {}}
+{"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": "SHUTDOWN"}
+{"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": "DEVICE_TRAY_MOVED", "data": {"device": "ide1-cd0", "tray-open": true}}
+{"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": "DEVICE_TRAY_MOVED", "data": {"device": "floppy0", "tray-open": true}}
+
+
+=== Encrypted image ===
+
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=134217728 encryption=on 
+Testing:
+QMP_VERSION
+{"return": {}}
+{"error": {"class": "GenericError", "desc": "blockdev-add doesn't support encrypted devices"}}
+{"return": {}}
+{"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": "SHUTDOWN"}
+{"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": "DEVICE_TRAY_MOVED", "data": {"device": "ide1-cd0", "tray-open": true}}
+{"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": "DEVICE_TRAY_MOVED", "data": {"device": "floppy0", "tray-open": true}}
+
+*** done

tests/qemu-iotests/group +1 -0

index 901730d..9ec62d2 100644
@@ -86,3 +86,4 @@
 081 rw auto
 082 rw auto quick
 086 rw auto quick
+087 rw auto quick

Signature · 1 line

1.8.1.4