13 files changed, 225 insertions, 116 deletions

diff --git a/block.c b/block.c
index 7a90a1b..990a754 100644
--- a/block.c
+++ b/block.c
@@ -767,6 +767,11 @@ static int bdrv_open_flags(BlockDriverState *bs, int flags)
 {
     int open_flags = flags | BDRV_O_CACHE_WB;
 
+    /* The backing file of a temporary snapshot is read-only */
+    if (flags & BDRV_O_SNAPSHOT) {
+        open_flags &= ~BDRV_O_RDWR;
+    }
+
     /*
      * Clear flags that are internal to the block layer before opening the
      * image.
@@ -968,7 +973,7 @@ static int bdrv_file_open(BlockDriverState *bs, const char *filename,
 {
     BlockDriver *drv;
     const char *drvname;
-    bool allow_protocol_prefix = false;
+    bool parse_filename = false;
     Error *local_err = NULL;
     int ret;
 
@@ -977,7 +982,7 @@ static int bdrv_file_open(BlockDriverState *bs, const char *filename,
         filename = qdict_get_try_str(*options, "filename");
     } else if (filename && !qdict_haskey(*options, "filename")) {
         qdict_put(*options, "filename", qstring_from_str(filename));
-        allow_protocol_prefix = true;
+        parse_filename = true;
     } else {
         error_setg(errp, "Can't specify 'file' and 'filename' options at the "
                    "same time");
@@ -994,7 +999,7 @@ static int bdrv_file_open(BlockDriverState *bs, const char *filename,
         }
         qdict_del(*options, "driver");
     } else if (filename) {
-        drv = bdrv_find_protocol(filename, allow_protocol_prefix);
+        drv = bdrv_find_protocol(filename, parse_filename);
         if (!drv) {
             error_setg(errp, "Unknown protocol");
         }
@@ -1010,7 +1015,7 @@ static int bdrv_file_open(BlockDriverState *bs, const char *filename,
     }
 
     /* Parse the filename and open it */
-    if (drv->bdrv_parse_filename && filename) {
+    if (drv->bdrv_parse_filename && parse_filename) {
         drv->bdrv_parse_filename(filename, *options, &local_err);
         if (local_err) {
             error_propagate(errp, local_err);
@@ -1162,6 +1167,73 @@ done:
     return ret;
 }
 
+void bdrv_append_temp_snapshot(BlockDriverState *bs, Error **errp)
+{
+    /* TODO: extra byte is a hack to ensure MAX_PATH space on Windows. */
+    char tmp_filename[PATH_MAX + 1];
+
+    int64_t total_size;
+    BlockDriver *bdrv_qcow2;
+    QEMUOptionParameter *create_options;
+    QDict *snapshot_options;
+    BlockDriverState *bs_snapshot;
+    Error *local_err;
+    int ret;
+
+    /* if snapshot, we create a temporary backing file and open it
+       instead of opening 'filename' directly */
+
+    /* Get the required size from the image */
+    total_size = bdrv_getlength(bs);
+    if (total_size < 0) {
+        error_setg_errno(errp, -total_size, "Could not get image size");
+        return;
+    }
+    total_size &= BDRV_SECTOR_MASK;
+
+    /* Create the temporary image */
+    ret = get_tmp_filename(tmp_filename, sizeof(tmp_filename));
+    if (ret < 0) {
+        error_setg_errno(errp, -ret, "Could not get temporary filename");
+        return;
+    }
+
+    bdrv_qcow2 = bdrv_find_format("qcow2");
+    create_options = parse_option_parameters("", bdrv_qcow2->create_options,
+                                             NULL);
+
+    set_option_parameter_int(create_options, BLOCK_OPT_SIZE, total_size);
+
+    ret = bdrv_create(bdrv_qcow2, tmp_filename, create_options, &local_err);
+    free_option_parameters(create_options);
+    if (ret < 0) {
+        error_setg_errno(errp, -ret, "Could not create temporary overlay "
+                         "'%s': %s", tmp_filename,
+                         error_get_pretty(local_err));
+        error_free(local_err);
+        return;
+    }
+
+    /* Prepare a new options QDict for the temporary file */
+    snapshot_options = qdict_new();
+    qdict_put(snapshot_options, "file.driver",
+              qstring_from_str("file"));
+    qdict_put(snapshot_options, "file.filename",
+              qstring_from_str(tmp_filename));
+
+    bs_snapshot = bdrv_new("");
+    bs_snapshot->is_temporary = 1;
+
+    ret = bdrv_open(&bs_snapshot, NULL, NULL, snapshot_options,
+                    bs->open_flags & ~BDRV_O_SNAPSHOT, bdrv_qcow2, &local_err);
+    if (ret < 0) {
+        error_propagate(errp, local_err);
+        return;
+    }
+
+    bdrv_append(bs_snapshot, bs);
+}
+
 /*
  * Opens a disk image (raw, qcow2, vmdk, ...)
  *
@@ -1182,8 +1254,6 @@ int bdrv_open(BlockDriverState **pbs, const char *filename,
               BlockDriver *drv, Error **errp)
 {
     int ret;
-    /* TODO: extra byte is a hack to ensure MAX_PATH space on Windows. */
-    char tmp_filename[PATH_MAX + 1];
     BlockDriverState *file = NULL, *bs;
     const char *drvname;
     Error *local_err = NULL;
@@ -1243,74 +1313,6 @@ int bdrv_open(BlockDriverState **pbs, const char *filename,
         }
     }
 
-    /* For snapshot=on, create a temporary qcow2 overlay */
-    if (flags & BDRV_O_SNAPSHOT) {
-        BlockDriverState *bs1;
-        int64_t total_size;
-        BlockDriver *bdrv_qcow2;
-        QEMUOptionParameter *create_options;
-        QDict *snapshot_options;
-
-        /* if snapshot, we create a temporary backing file and open it
-           instead of opening 'filename' directly */
-
-        /* Get the required size from the image */
-        QINCREF(options);
-        bs1 = NULL;
-        ret = bdrv_open(&bs1, filename, NULL, options, BDRV_O_NO_BACKING,
-                        drv, &local_err);
-        if (ret < 0) {
-            goto fail;
-        }
-        total_size = bdrv_getlength(bs1) & BDRV_SECTOR_MASK;
-
-        bdrv_unref(bs1);
-
-        /* Create the temporary image */
-        ret = get_tmp_filename(tmp_filename, sizeof(tmp_filename));
-        if (ret < 0) {
-            error_setg_errno(errp, -ret, "Could not get temporary filename");
-            goto fail;
-        }
-
-        bdrv_qcow2 = bdrv_find_format("qcow2");
-        create_options = parse_option_parameters("", bdrv_qcow2->create_options,
-                                                 NULL);
-
-        set_option_parameter_int(create_options, BLOCK_OPT_SIZE, total_size);
-
-        ret = bdrv_create(bdrv_qcow2, tmp_filename, create_options, &local_err);
-        free_option_parameters(create_options);
-        if (ret < 0) {
-            error_setg_errno(errp, -ret, "Could not create temporary overlay "
-                             "'%s': %s", tmp_filename,
-                             error_get_pretty(local_err));
-            error_free(local_err);
-            local_err = NULL;
-            goto fail;
-        }
-
-        /* Prepare a new options QDict for the temporary file, where user
-         * options refer to the backing file */
-        if (filename) {
-            qdict_put(options, "file.filename", qstring_from_str(filename));
-        }
-        if (drv) {
-            qdict_put(options, "driver", qstring_from_str(drv->format_name));
-        }
-
-        snapshot_options = qdict_new();
-        qdict_put(snapshot_options, "backing", options);
-        qdict_flatten(snapshot_options);
-
-        bs->options = snapshot_options;
-        options = qdict_clone_shallow(bs->options);
-
-        filename = tmp_filename;
-        drv = bdrv_qcow2;
-        bs->is_temporary = 1;
-    }
-
     /* Open image file without format layer */
     if (flags & BDRV_O_RDWR) {
         flags |= BDRV_O_ALLOW_RDWR;
@@ -1372,6 +1374,17 @@ int bdrv_open(BlockDriverState **pbs, const char *filename,
         }
     }
 
+    /* For snapshot=on, create a temporary qcow2 overlay. bs points to the
+     * temporary snapshot afterwards. */
+    if (flags & BDRV_O_SNAPSHOT) {
+        bdrv_append_temp_snapshot(bs, &local_err);
+        if (local_err) {
+            error_propagate(errp, local_err);
+            goto close_and_fail;
+        }
+    }
+
+
 done:
     /* Check if any unknown options were used */
     if (options && (qdict_size(options) != 0)) {
diff --git a/block/iscsi.c b/block/iscsi.c
index 21c18a3..64a509f 100644
--- a/block/iscsi.c
+++ b/block/iscsi.c
@@ -1101,8 +1101,10 @@ static struct scsi_task *iscsi_do_inquiry(struct iscsi_context *iscsi, int lun,
     return task;
 
 fail:
-    error_setg(errp, "iSCSI: Inquiry command failed : %s",
-               iscsi_get_error(iscsi));
+    if (!error_is_set(errp)) {
+        error_setg(errp, "iSCSI: Inquiry command failed : %s",
+                   iscsi_get_error(iscsi));
+    }
     if (task != NULL) {
         scsi_free_scsi_task(task);
     }
diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c
index 60a6910..331ab08 100644
--- a/block/qcow2-cluster.c
+++ b/block/qcow2-cluster.c
@@ -491,6 +491,7 @@ int qcow2_get_cluster_offset(BlockDriverState *bs, uint64_t offset,
         break;
     case QCOW2_CLUSTER_ZERO:
         if (s->qcow_version < 3) {
+            qcow2_cache_put(bs, s->l2_table_cache, (void**) &l2_table);
             return -EIO;
         }
         c = count_contiguous_clusters(nb_clusters, s->cluster_size,
diff --git a/block/qcow2.c b/block/qcow2.c
index 333e26d..e903d97 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -269,12 +269,15 @@ static int qcow2_mark_clean(BlockDriverState *bs)
     BDRVQcowState *s = bs->opaque;
 
     if (s->incompatible_features & QCOW2_INCOMPAT_DIRTY) {
-        int ret = bdrv_flush(bs);
+        int ret;
+
+        s->incompatible_features &= ~QCOW2_INCOMPAT_DIRTY;
+
+        ret = bdrv_flush(bs);
         if (ret < 0) {
             return ret;
         }
 
-        s->incompatible_features &= ~QCOW2_INCOMPAT_DIRTY;
         return qcow2_update_header(bs);
     }
     return 0;
@@ -900,11 +903,25 @@ static int qcow2_set_key(BlockDriverState *bs, const char *key)
     return 0;
 }
 
-/* We have nothing to do for QCOW2 reopen, stubs just return
- * success */
+/* We have no actual commit/abort logic for qcow2, but we need to write out any
+ * unwritten data if we reopen read-only. */
 static int qcow2_reopen_prepare(BDRVReopenState *state,
                                 BlockReopenQueue *queue, Error **errp)
 {
+    int ret;
+
+    if ((state->flags & BDRV_O_RDWR) == 0) {
+        ret = bdrv_flush(state->bs);
+        if (ret < 0) {
+            return ret;
+        }
+
+        ret = qcow2_mark_clean(state->bs);
+        if (ret < 0) {
+            return ret;
+        }
+    }
+
     return 0;
 }
 
diff --git a/dma-helpers.c b/dma-helpers.c
index c9620a5..5f421e9 100644
--- a/dma-helpers.c
+++ b/dma-helpers.c
@@ -213,6 +213,7 @@ BlockDriverAIOCB *dma_bdrv_io(
     dbs->sg_cur_index = 0;
     dbs->sg_cur_byte = 0;
     dbs->dir = dir;
+    dbs->in_cancel = false;
     dbs->io_func = io_func;
     dbs->bh = NULL;
     qemu_iovec_init(&dbs->iov, sg->nsg);
diff --git a/hw/block/dataplane/virtio-blk.c b/hw/block/dataplane/virtio-blk.c
index f558b45..70b8a5a 100644
--- a/hw/block/dataplane/virtio-blk.c
+++ b/hw/block/dataplane/virtio-blk.c
@@ -23,7 +23,7 @@
 #include "virtio-blk.h"
 #include "block/aio.h"
 #include "hw/virtio/virtio-bus.h"
-#include "monitor/monitor.h" /* for object_add() */
+#include "qom/object_interfaces.h"
 
 enum {
     SEG_MAX = 126,                  /* maximum number of I/O segments */
@@ -59,7 +59,7 @@ struct VirtIOBlockDataPlane {
      * use it).
      */
     IOThread *iothread;
-    bool internal_iothread;
+    IOThread internal_iothread_obj;
     AioContext *ctx;
     EventNotifier io_notifier;      /* Linux AIO completion */
     EventNotifier host_notifier;    /* doorbell */
@@ -391,23 +391,19 @@ void virtio_blk_data_plane_create(VirtIODevice *vdev, VirtIOBlkConf *blk,
     s->blk = blk;
 
     if (blk->iothread) {
-        s->internal_iothread = false;
         s->iothread = blk->iothread;
+        object_ref(OBJECT(s->iothread));
     } else {
-        /* Create per-device IOThread if none specified */
-        Error *local_err = NULL;
-
-        s->internal_iothread = true;
-        object_add(TYPE_IOTHREAD, vdev->name, NULL, NULL, &local_err);
-        if (error_is_set(&local_err)) {
-            error_propagate(errp, local_err);
-            g_free(s);
-            return;
-        }
-        s->iothread = iothread_find(vdev->name);
-        assert(s->iothread);
+        /* Create per-device IOThread if none specified.  This is for
+         * x-data-plane option compatibility.  If x-data-plane is removed we
+         * can drop this.
+         */
+        object_initialize(&s->internal_iothread_obj,
+                          sizeof(s->internal_iothread_obj),
+                          TYPE_IOTHREAD);
+        user_creatable_complete(OBJECT(&s->internal_iothread_obj), &error_abort);
+        s->iothread = &s->internal_iothread_obj;
     }
-    object_ref(OBJECT(s->iothread));
     s->ctx = iothread_get_aio_context(s->iothread);
 
     /* Prevent block operations that conflict with data plane thread */
@@ -426,9 +422,6 @@ void virtio_blk_data_plane_destroy(VirtIOBlockDataPlane *s)
     virtio_blk_data_plane_stop(s);
     bdrv_set_in_use(s->blk->conf.bs, 0);
     object_unref(OBJECT(s->iothread));
-    if (s->internal_iothread) {
-        object_unparent(OBJECT(s->iothread));
-    }
     g_free(s);
 }
 
diff --git a/include/block/block.h b/include/block/block.h
index 1ed55d8..b3230a2 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -190,6 +190,7 @@ int bdrv_open_image(BlockDriverState **pbs, const char *filename,
                     QDict *options, const char *bdref_key, int flags,
                     bool allow_none, Error **errp);
 int bdrv_open_backing_file(BlockDriverState *bs, QDict *options, Error **errp);
+void bdrv_append_temp_snapshot(BlockDriverState *bs, Error **errp);
 int bdrv_open(BlockDriverState **pbs, const char *filename,
               const char *reference, QDict *options, int flags,
               BlockDriver *drv, Error **errp);
diff --git a/include/sysemu/iothread.h b/include/sysemu/iothread.h
index a32214a..7c01a61 100644
--- a/include/sysemu/iothread.h
+++ b/include/sysemu/iothread.h
@@ -15,10 +15,20 @@
 #define IOTHREAD_H
 
 #include "block/aio.h"
+#include "qemu/thread.h"
 
 #define TYPE_IOTHREAD "iothread"
 
-typedef struct IOThread IOThread;
+typedef struct {
+    Object parent_obj;
+
+    QemuThread thread;
+    AioContext *ctx;
+    QemuMutex init_done_lock;
+    QemuCond init_done_cond;    /* is thread initialization done? */
+    bool stopping;
+    int thread_id;
+} IOThread;
 
 #define IOTHREAD(obj) \
    OBJECT_CHECK(IOThread, obj, TYPE_IOTHREAD)
diff --git a/iothread.c b/iothread.c
index cb5986b..1fbf9f1 100644
--- a/iothread.c
+++ b/iothread.c
@@ -14,7 +14,6 @@
 #include "qom/object.h"
 #include "qom/object_interfaces.h"
 #include "qemu/module.h"
-#include "qemu/thread.h"
 #include "block/aio.h"
 #include "sysemu/iothread.h"
 #include "qmp-commands.h"
@@ -22,16 +21,6 @@
 #define IOTHREADS_PATH "/objects"
 
 typedef ObjectClass IOThreadClass;
-struct IOThread {
-    Object parent_obj;
-
-    QemuThread thread;
-    AioContext *ctx;
-    QemuMutex init_done_lock;
-    QemuCond init_done_cond;    /* is thread initialization done? */
-    bool stopping;
-    int thread_id;
-};
 
 #define IOTHREAD_GET_CLASS(obj) \
    OBJECT_GET_CLASS(IOThreadClass, obj, TYPE_IOTHREAD)
diff --git a/tests/qemu-iotests/039 b/tests/qemu-iotests/039
index 9b355c0..b9cbe99 100755
--- a/tests/qemu-iotests/039
+++ b/tests/qemu-iotests/039
@@ -131,6 +131,26 @@ ulimit -c "$old_ulimit"
 ./qcow2.py "$TEST_IMG" dump-header | grep incompatible_features
 _check_test_img
 
+echo
+echo "== Committing to a backing file with lazy_refcounts=on =="
+
+IMGOPTS="compat=1.1,lazy_refcounts=on"
+TEST_IMG="$TEST_IMG".base _make_test_img $size
+
+IMGOPTS="compat=1.1,lazy_refcounts=on,backing_file=$TEST_IMG.base"
+_make_test_img $size
+
+$QEMU_IO -c "write 0 512" "$TEST_IMG" | _filter_qemu_io
+$QEMU_IMG commit "$TEST_IMG"
+
+# The dirty bit must not be set
+./qcow2.py "$TEST_IMG" dump-header | grep incompatible_features
+./qcow2.py "$TEST_IMG".base dump-header | grep incompatible_features
+
+_check_test_img
+TEST_IMG="$TEST_IMG".base _check_test_img
+
+
 # success, all done
 echo "*** done"
 rm -f $seq.full
diff --git a/tests/qemu-iotests/039.out b/tests/qemu-iotests/039.out
index 077fa64..fb31ae0 100644
--- a/tests/qemu-iotests/039.out
+++ b/tests/qemu-iotests/039.out
@@ -54,4 +54,15 @@ wrote 512/512 bytes at offset 0
 512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 incompatible_features     0x0
 No errors were found on the image.
+
+== Committing to a backing file with lazy_refcounts=on ==
+Formatting 'TEST_DIR/t.IMGFMT.base', fmt=IMGFMT size=134217728 
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=134217728 backing_file='TEST_DIR/t.IMGFMT.base' 
+wrote 512/512 bytes at offset 0
+512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+Image committed.
+incompatible_features     0x0
+incompatible_features     0x0
+No errors were found on the image.
+No errors were found on the image.
 *** done
diff --git a/tests/qemu-iotests/051 b/tests/qemu-iotests/051
index 14694e1..073dc7a 100755
--- a/tests/qemu-iotests/051
+++ b/tests/qemu-iotests/051
@@ -204,6 +204,10 @@ run_qemu -hda foo:bar
 run_qemu -drive file=foo:bar
 run_qemu -drive file.filename=foo:bar
 
+run_qemu -hda "file:$TEST_IMG"
+run_qemu -drive file="file:$TEST_IMG"
+run_qemu -drive file.filename="file:$TEST_IMG"
+
 echo
 echo === Snapshot mode ===
 echo
@@ -214,6 +218,14 @@ echo 'qemu-io ide0-hd0 "write -P 0x22 0 4k"' | run_qemu -drive file="$TEST_IMG"
 echo 'qemu-io ide0-hd0 "write -P 0x22 0 4k"' | run_qemu -drive file="$TEST_IMG",snapshot=on | _filter_qemu_io
 echo 'qemu-io ide0-hd0 "write -P 0x22 0 4k"' | run_qemu -drive file.filename="$TEST_IMG",driver=qcow2,snapshot=on | _filter_qemu_io
 echo 'qemu-io ide0-hd0 "write -P 0x22 0 4k"' | run_qemu -drive file.filename="$TEST_IMG",driver=qcow2 -snapshot | _filter_qemu_io
+echo 'qemu-io ide0-hd0 "write -P 0x22 0 4k"' | run_qemu -drive file="file:$TEST_IMG" -snapshot | _filter_qemu_io
+echo 'qemu-io ide0-hd0 "write -P 0x22 0 4k"' | run_qemu -drive file="file:$TEST_IMG",snapshot=on | _filter_qemu_io
+
+# Opening a read-only file r/w with snapshot=on
+chmod u-w "$TEST_IMG"
+echo 'qemu-io ide0-hd0 "write -P 0x22 0 4k"' | run_qemu -drive file="$TEST_IMG" -snapshot | _filter_qemu_io
+echo 'qemu-io ide0-hd0 "write -P 0x22 0 4k"' | run_qemu -drive file="$TEST_IMG",snapshot=on | _filter_qemu_io
+chmod u+w "$TEST_IMG"
 
 $QEMU_IO -c "read -P 0x11 0 4k" "$TEST_IMG" | _filter_qemu_io
 
diff --git a/tests/qemu-iotests/051.out b/tests/qemu-iotests/051.out
index f5e33ff..01b0384 100644
--- a/tests/qemu-iotests/051.out
+++ b/tests/qemu-iotests/051.out
@@ -44,11 +44,11 @@ QEMU_PROG: -drive file=TEST_DIR/t.qcow2,driver=foo: could not open disk image TE
 === Overriding backing file ===
 
 Testing: -drive file=TEST_DIR/t.qcow2,driver=qcow2,backing.file.filename=TEST_DIR/t.qcow2.orig -nodefaults
-QEMU X.Y.Z monitor - type 'help' for more information

-(qemu) iininfinfoinfo info binfo blinfo bloinfo blocinfo block

-ide0-hd0: TEST_DIR/t.qcow2 (qcow2)

-    Backing file:     TEST_DIR/t.qcow2.orig (chain depth: 1)

-(qemu) qququiquit

+QEMU X.Y.Z monitor - type 'help' for more information
+(qemu) iininfinfoinfo info binfo blinfo bloinfo blocinfo block
+ide0-hd0: TEST_DIR/t.qcow2 (qcow2)
+    Backing file:     TEST_DIR/t.qcow2.orig (chain depth: 1)
+(qemu) qququiquit
 
 
 === Enable and disable lazy refcounting on the command line, plus some invalid values ===
@@ -275,6 +275,17 @@ QEMU_PROG: -drive file=foo:bar: could not open disk image foo:bar: Unknown proto
 Testing: -drive file.filename=foo:bar
 QEMU_PROG: -drive file.filename=foo:bar: could not open disk image ide0-hd0: Could not open 'foo:bar': No such file or directory
 
+Testing: -hda file:TEST_DIR/t.qcow2
+QEMU X.Y.Z monitor - type 'help' for more information
+(qemu) qququiquit
+
+Testing: -drive file=file:TEST_DIR/t.qcow2
+QEMU X.Y.Z monitor - type 'help' for more information
+(qemu) qququiquit
+
+Testing: -drive file.filename=file:TEST_DIR/t.qcow2
+QEMU_PROG: -drive file.filename=file:TEST_DIR/t.qcow2: could not open disk image ide0-hd0: Could not open 'file:TEST_DIR/t.qcow2': No such file or directory
+
 
 === Snapshot mode ===
 
@@ -308,6 +319,34 @@ wrote 4096/4096 bytes at offset 0
 4 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 (qemu) qququiquit
 
+Testing: -drive file=file:TEST_DIR/t.qcow2 -snapshot
+QEMU X.Y.Z monitor - type 'help' for more information
+(qemu) qqeqemqemuqemu-qemu-iqemu-ioqemu-io qemu-io iqemu-io idqemu-io ideqemu-io ide0qemu-io ide0-qemu-io ide0-hqemu-io ide0-hdqemu-io ide0-hd0qemu-io ide0-hd0 qemu-io ide0-hd0 "qemu-io ide0-hd0 "wqemu-io ide0-hd0 "wrqemu-io ide0-hd0 "wriqemu-io ide0-hd0 "writqemu-io ide0-hd0 "writeqemu-io ide0-hd0 "write qemu-io ide0-hd0 "write -qemu-io ide0-hd0 "write -Pqemu-io ide0-hd0 "write -P qemu-io ide0-hd0 "write -P 0qemu-io ide0-hd0 "write -P 0xqemu-io ide0-hd0 "write -P 0x2qemu-io ide0-hd0 "write -P 0x22qemu-io ide0-hd0 "write -P 0x22 qemu-io ide0-hd0 "write -P 0x22 0qemu-io ide0-hd0 "write -P 0x22 0 qemu-io ide0-hd0 "write -P 0x22 0 4qemu-io ide0-hd0 "write -P 0x22 0 4kqemu-io ide0-hd0 "write -P 0x22 0 4k"
+wrote 4096/4096 bytes at offset 0
+4 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+(qemu) qququiquit
+
+Testing: -drive file=file:TEST_DIR/t.qcow2,snapshot=on
+QEMU X.Y.Z monitor - type 'help' for more information
+(qemu) qqeqemqemuqemu-qemu-iqemu-ioqemu-io qemu-io iqemu-io idqemu-io ideqemu-io ide0qemu-io ide0-qemu-io ide0-hqemu-io ide0-hdqemu-io ide0-hd0qemu-io ide0-hd0 qemu-io ide0-hd0 "qemu-io ide0-hd0 "wqemu-io ide0-hd0 "wrqemu-io ide0-hd0 "wriqemu-io ide0-hd0 "writqemu-io ide0-hd0 "writeqemu-io ide0-hd0 "write qemu-io ide0-hd0 "write -qemu-io ide0-hd0 "write -Pqemu-io ide0-hd0 "write -P qemu-io ide0-hd0 "write -P 0qemu-io ide0-hd0 "write -P 0xqemu-io ide0-hd0 "write -P 0x2qemu-io ide0-hd0 "write -P 0x22qemu-io ide0-hd0 "write -P 0x22 qemu-io ide0-hd0 "write -P 0x22 0qemu-io ide0-hd0 "write -P 0x22 0 qemu-io ide0-hd0 "write -P 0x22 0 4qemu-io ide0-hd0 "write -P 0x22 0 4kqemu-io ide0-hd0 "write -P 0x22 0 4k"
+wrote 4096/4096 bytes at offset 0
+4 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+(qemu) qququiquit
+
+Testing: -drive file=TEST_DIR/t.qcow2 -snapshot
+QEMU X.Y.Z monitor - type 'help' for more information
+(qemu) qqeqemqemuqemu-qemu-iqemu-ioqemu-io qemu-io iqemu-io idqemu-io ideqemu-io ide0qemu-io ide0-qemu-io ide0-hqemu-io ide0-hdqemu-io ide0-hd0qemu-io ide0-hd0 qemu-io ide0-hd0 "qemu-io ide0-hd0 "wqemu-io ide0-hd0 "wrqemu-io ide0-hd0 "wriqemu-io ide0-hd0 "writqemu-io ide0-hd0 "writeqemu-io ide0-hd0 "write qemu-io ide0-hd0 "write -qemu-io ide0-hd0 "write -Pqemu-io ide0-hd0 "write -P qemu-io ide0-hd0 "write -P 0qemu-io ide0-hd0 "write -P 0xqemu-io ide0-hd0 "write -P 0x2qemu-io ide0-hd0 "write -P 0x22qemu-io ide0-hd0 "write -P 0x22 qemu-io ide0-hd0 "write -P 0x22 0qemu-io ide0-hd0 "write -P 0x22 0 qemu-io ide0-hd0 "write -P 0x22 0 4qemu-io ide0-hd0 "write -P 0x22 0 4kqemu-io ide0-hd0 "write -P 0x22 0 4k"
+wrote 4096/4096 bytes at offset 0
+4 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+(qemu) qququiquit
+
+Testing: -drive file=TEST_DIR/t.qcow2,snapshot=on
+QEMU X.Y.Z monitor - type 'help' for more information
+(qemu) qqeqemqemuqemu-qemu-iqemu-ioqemu-io qemu-io iqemu-io idqemu-io ideqemu-io ide0qemu-io ide0-qemu-io ide0-hqemu-io ide0-hdqemu-io ide0-hd0qemu-io ide0-hd0 qemu-io ide0-hd0 "qemu-io ide0-hd0 "wqemu-io ide0-hd0 "wrqemu-io ide0-hd0 "wriqemu-io ide0-hd0 "writqemu-io ide0-hd0 "writeqemu-io ide0-hd0 "write qemu-io ide0-hd0 "write -qemu-io ide0-hd0 "write -Pqemu-io ide0-hd0 "write -P qemu-io ide0-hd0 "write -P 0qemu-io ide0-hd0 "write -P 0xqemu-io ide0-hd0 "write -P 0x2qemu-io ide0-hd0 "write -P 0x22qemu-io ide0-hd0 "write -P 0x22 qemu-io ide0-hd0 "write -P 0x22 0qemu-io ide0-hd0 "write -P 0x22 0 qemu-io ide0-hd0 "write -P 0x22 0 4qemu-io ide0-hd0 "write -P 0x22 0 4kqemu-io ide0-hd0 "write -P 0x22 0 4k"
+wrote 4096/4096 bytes at offset 0
+4 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+(qemu) qququiquit
+
 read 4096/4096 bytes at offset 0
 4 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 Testing: -drive file=TEST_DIR/t.qcow2,snapshot=off