Merge remote-tracking branch 'remotes/maxreitz/tags/pull-block-2021-03-30' into staging

Block patches for 6.0-rc1:
- Mark the qcow2 cache clean timer as external to fix record/replay
- Fix the mirror filter node's permissions so that an external process
  cannot grab an image while it is used as the mirror source
- Add documentation about FUSE exports to the storage daemon
- When creating a qcow2 image with the data-file-raw option, all
  metadata structures should be preallocated
- iotest fixes

# gpg: Signature made Tue 30 Mar 2021 13:38:40 BST
# gpg:                using RSA key 91BEB60A30DB3E8857D11829F407DB0061D5CF40
# gpg:                issuer "mreitz@redhat.com"
# gpg: Good signature from "Max Reitz <mreitz@redhat.com>" [full]
# Primary key fingerprint: 91BE B60A 30DB 3E88 57D1  1829 F407 DB00 61D5 CF40

* remotes/maxreitz/tags/pull-block-2021-03-30:
  iotests/244: Test preallocation for data-file-raw
  qcow2: Force preallocation with data-file-raw
  qsd: Document FUSE exports
  block/mirror: Fix mirror_top's permissions
  iotests/046: Filter request length
  qcow2: use external virtual timers
  iotests/116: Fix reference output
  iotests: fix 051.out expected output after error text touchups
  iotests: Fix typo in iotest 051

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

8 files changed, 233 insertions, 70 deletions

diff --git a/tests/qemu-iotests/046 b/tests/qemu-iotests/046
index 50b0678f60..517b162508 100755
--- a/tests/qemu-iotests/046
+++ b/tests/qemu-iotests/046
@@ -187,7 +187,8 @@ EOF
 }
 
 overlay_io | $QEMU_IO blkdebug::"$TEST_IMG" | _filter_qemu_io |\
-	sed -e 's/bytes at offset [0-9]*/bytes at offset XXX/g'
+    sed -e 's/[0-9]*\/[0-9]* bytes at offset [0-9]*/XXX\/XXX bytes at offset XXX/g' \
+        -e 's/^[0-9]* KiB/XXX KiB/g'
 
 echo
 echo "== Verify image content =="
diff --git a/tests/qemu-iotests/046.out b/tests/qemu-iotests/046.out
index 66ad987ab3..b1a03f4041 100644
--- a/tests/qemu-iotests/046.out
+++ b/tests/qemu-iotests/046.out
@@ -71,74 +71,74 @@ Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=6442450944 backing_file=TEST_DIR
 == Some concurrent requests touching the same cluster ==
 blkdebug: Suspended request 'A'
 blkdebug: Resuming request 'A'
-wrote 8192/8192 bytes at offset XXX
-8 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
-wrote 8192/8192 bytes at offset XXX
-8 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
-wrote 8192/8192 bytes at offset XXX
-8 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+wrote XXX/XXX bytes at offset XXX
+XXX KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+wrote XXX/XXX bytes at offset XXX
+XXX KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+wrote XXX/XXX bytes at offset XXX
+XXX KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 blkdebug: Suspended request 'A'
 blkdebug: Resuming request 'A'
-wrote 8192/8192 bytes at offset XXX
-8 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
-wrote 65536/65536 bytes at offset XXX
-64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+wrote XXX/XXX bytes at offset XXX
+XXX KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+wrote XXX/XXX bytes at offset XXX
+XXX KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 blkdebug: Suspended request 'A'
 blkdebug: Resuming request 'A'
-wrote 8192/8192 bytes at offset XXX
-8 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
-wrote 65536/65536 bytes at offset XXX
-64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
-wrote 32768/32768 bytes at offset XXX
-32 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+wrote XXX/XXX bytes at offset XXX
+XXX KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+wrote XXX/XXX bytes at offset XXX
+XXX KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+wrote XXX/XXX bytes at offset XXX
+XXX KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 blkdebug: Suspended request 'A'
 blkdebug: Resuming request 'A'
-wrote 8192/8192 bytes at offset XXX
-8 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
-wrote 57344/57344 bytes at offset XXX
-56 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
-wrote 4096/4096 bytes at offset XXX
-4 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
-wrote 32768/32768 bytes at offset XXX
-32 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
-discard 65536/65536 bytes at offset XXX
-64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+wrote XXX/XXX bytes at offset XXX
+XXX KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+wrote XXX/XXX bytes at offset XXX
+XXX KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+wrote XXX/XXX bytes at offset XXX
+XXX KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+wrote XXX/XXX bytes at offset XXX
+XXX KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+discard XXX/XXX bytes at offset XXX
+XXX KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 blkdebug: Suspended request 'A'
 blkdebug: Resuming request 'A'
-wrote 8192/8192 bytes at offset XXX
-8 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
-wrote 57344/57344 bytes at offset XXX
-56 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
-wrote 4096/4096 bytes at offset XXX
-4 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
-wrote 65536/65536 bytes at offset XXX
-64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
-discard 65536/65536 bytes at offset XXX
-64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+wrote XXX/XXX bytes at offset XXX
+XXX KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+wrote XXX/XXX bytes at offset XXX
+XXX KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+wrote XXX/XXX bytes at offset XXX
+XXX KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+wrote XXX/XXX bytes at offset XXX
+XXX KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+discard XXX/XXX bytes at offset XXX
+XXX KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 blkdebug: Suspended request 'A'
 blkdebug: Resuming request 'A'
-wrote 8192/8192 bytes at offset XXX
-8 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
-wrote 57344/57344 bytes at offset XXX
-56 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+wrote XXX/XXX bytes at offset XXX
+XXX KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+wrote XXX/XXX bytes at offset XXX
+XXX KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 blkdebug: Suspended request 'A'
 blkdebug: Resuming request 'A'
-wrote 8192/8192 bytes at offset XXX
-8 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
-wrote 98304/98304 bytes at offset XXX
-96 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+wrote XXX/XXX bytes at offset XXX
+XXX KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+wrote XXX/XXX bytes at offset XXX
+XXX KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 blkdebug: Suspended request 'A'
 blkdebug: Resuming request 'A'
-wrote 8192/8192 bytes at offset XXX
-8 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
-wrote 81920/81920 bytes at offset XXX
-80 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+wrote XXX/XXX bytes at offset XXX
+XXX KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+wrote XXX/XXX bytes at offset XXX
+XXX KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 blkdebug: Suspended request 'A'
 blkdebug: Resuming request 'A'
-wrote 32768/32768 bytes at offset XXX
-32 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
-wrote 98304/98304 bytes at offset XXX
-96 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+wrote XXX/XXX bytes at offset XXX
+XXX KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+wrote XXX/XXX bytes at offset XXX
+XXX KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 
 == Verify image content ==
 read 65536/65536 bytes at offset 0
diff --git a/tests/qemu-iotests/051 b/tests/qemu-iotests/051
index 333cc81818..7bf29343d7 100755
--- a/tests/qemu-iotests/051
+++ b/tests/qemu-iotests/051
@@ -199,7 +199,7 @@ case "$QEMU_DEFAULT_MACHINE" in
         # virtio-blk enables the iothread only when the driver initialises the
         # device, so a second virtio-blk device can't be added even with the
         # same iothread. virtio-scsi allows this.
-        run_qemu $iothread -device virtio-blk-pci,drive=disk,iohtread=iothread0,share-rw=on
+        run_qemu $iothread -device virtio-blk-pci,drive=disk,iothread=iothread0,share-rw=on
         run_qemu $iothread -device virtio-scsi,id=virtio-scsi1,iothread=thread0 -device scsi-hd,bus=virtio-scsi1.0,drive=disk,share-rw=on
         ;;
      *)
diff --git a/tests/qemu-iotests/051.out b/tests/qemu-iotests/051.out
index 437053c839..441f83e41a 100644
--- a/tests/qemu-iotests/051.out
+++ b/tests/qemu-iotests/051.out
@@ -61,13 +61,13 @@ QEMU X.Y.Z monitor - type 'help' for more information
 (qemu) quit
 
 Testing: -drive file=TEST_DIR/t.qcow2,node-name=123foo
-QEMU_PROG: -drive file=TEST_DIR/t.qcow2,node-name=123foo: Invalid node name
+QEMU_PROG: -drive file=TEST_DIR/t.qcow2,node-name=123foo: Invalid node-name: '123foo'
 
 Testing: -drive file=TEST_DIR/t.qcow2,node-name=_foo
-QEMU_PROG: -drive file=TEST_DIR/t.qcow2,node-name=_foo: Invalid node name
+QEMU_PROG: -drive file=TEST_DIR/t.qcow2,node-name=_foo: Invalid node-name: '_foo'
 
 Testing: -drive file=TEST_DIR/t.qcow2,node-name=foo#12
-QEMU_PROG: -drive file=TEST_DIR/t.qcow2,node-name=foo#12: Invalid node name
+QEMU_PROG: -drive file=TEST_DIR/t.qcow2,node-name=foo#12: Invalid node-name: 'foo#12'
 
 
 === Device without drive ===
diff --git a/tests/qemu-iotests/051.pc.out b/tests/qemu-iotests/051.pc.out
index e95bd42b8d..afe7632964 100644
--- a/tests/qemu-iotests/051.pc.out
+++ b/tests/qemu-iotests/051.pc.out
@@ -183,9 +183,9 @@ Testing: -drive file=TEST_DIR/t.qcow2,if=none,node-name=disk -object iothread,id
 QEMU X.Y.Z monitor - type 'help' for more information
 (qemu) QEMU_PROG: -device scsi-hd,bus=virtio-scsi1.0,drive=disk,share-rw=on: Cannot change iothread of active block backend
 
-Testing: -drive file=TEST_DIR/t.qcow2,if=none,node-name=disk -object iothread,id=thread0 -device virtio-scsi,iothread=thread0,id=virtio-scsi0 -device scsi-hd,bus=virtio-scsi0.0,drive=disk,share-rw=on -device virtio-blk-pci,drive=disk,iohtread=iothread0,share-rw=on
+Testing: -drive file=TEST_DIR/t.qcow2,if=none,node-name=disk -object iothread,id=thread0 -device virtio-scsi,iothread=thread0,id=virtio-scsi0 -device scsi-hd,bus=virtio-scsi0.0,drive=disk,share-rw=on -device virtio-blk-pci,drive=disk,iothread=iothread0,share-rw=on
 QEMU X.Y.Z monitor - type 'help' for more information
-(qemu) QEMU_PROG: -device virtio-blk-pci,drive=disk,iohtread=iothread0,share-rw=on: Cannot change iothread of active block backend
+(qemu) QEMU_PROG: -device virtio-blk-pci,drive=disk,iothread=iothread0,share-rw=on: Cannot change iothread of active block backend
 
 Testing: -drive file=TEST_DIR/t.qcow2,if=none,node-name=disk -object iothread,id=thread0 -device virtio-scsi,iothread=thread0,id=virtio-scsi0 -device scsi-hd,bus=virtio-scsi0.0,drive=disk,share-rw=on -device virtio-scsi,id=virtio-scsi1,iothread=thread0 -device scsi-hd,bus=virtio-scsi1.0,drive=disk,share-rw=on
 QEMU X.Y.Z monitor - type 'help' for more information
diff --git a/tests/qemu-iotests/116.out b/tests/qemu-iotests/116.out
index 49f9a261a0..5f6c6fffca 100644
--- a/tests/qemu-iotests/116.out
+++ b/tests/qemu-iotests/116.out
@@ -2,7 +2,7 @@ QA output created by 116
 
 == truncated header cluster ==
 Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=134217728
-qemu-io: can't open device TEST_DIR/t.qed: Could not open 'TEST_DIR/t.qed': Invalid argument
+qemu-io: can't open device TEST_DIR/t.qed: QED table offset is invalid
 
 == invalid header magic ==
 Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=134217728
@@ -10,21 +10,21 @@ qemu-io: can't open device TEST_DIR/t.qed: Image not in QED format
 
 == invalid cluster size ==
 Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=134217728
-qemu-io: can't open device TEST_DIR/t.qed: Could not open 'TEST_DIR/t.qed': Invalid argument
+qemu-io: can't open device TEST_DIR/t.qed: QED cluster size is invalid
 
 == invalid table size ==
 Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=134217728
-qemu-io: can't open device TEST_DIR/t.qed: Could not open 'TEST_DIR/t.qed': Invalid argument
+qemu-io: can't open device TEST_DIR/t.qed: QED table size is invalid
 
 == invalid header size ==
 Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=134217728
-qemu-io: can't open device TEST_DIR/t.qed: Could not open 'TEST_DIR/t.qed': Invalid argument
+qemu-io: can't open device TEST_DIR/t.qed: QED table offset is invalid
 
 == invalid L1 table offset ==
 Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=134217728
-qemu-io: can't open device TEST_DIR/t.qed: Could not open 'TEST_DIR/t.qed': Invalid argument
+qemu-io: can't open device TEST_DIR/t.qed: QED table offset is invalid
 
 == invalid image size ==
 Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=134217728
-qemu-io: can't open device TEST_DIR/t.qed: Could not open 'TEST_DIR/t.qed': Invalid argument
+qemu-io: can't open device TEST_DIR/t.qed: QED image size is invalid
 *** done
diff --git a/tests/qemu-iotests/244 b/tests/qemu-iotests/244
index a46b441627..3e61fa25bb 100755
--- a/tests/qemu-iotests/244
+++ b/tests/qemu-iotests/244
@@ -38,6 +38,7 @@ trap "_cleanup; exit \$status" 0 1 2 3 15
 # get standard environment, filters and checks
 . ./common.rc
 . ./common.filter
+. ./common.qemu
 
 _supported_fmt qcow2
 _supported_proto file
@@ -267,6 +268,109 @@ case $result in
         ;;
 esac
 
+echo
+echo '=== Preallocation with data-file-raw ==='
+
+echo
+echo '--- Using a non-zeroed data file ---'
+
+# Using data-file-raw must enforce at least metadata preallocation so
+# that it does not matter whether one reads the raw file or the qcow2
+# file
+
+# Pre-create the data file, write some data.  Real-world use cases for
+# this are adding a qcow2 metadata file to a block device (i.e., using
+# the device as the data file) or adding qcow2 features to pre-existing
+# raw images (e.g. because the user now wants persistent dirty bitmaps).
+truncate -s 1M "$TEST_IMG.data"
+$QEMU_IO -f raw -c 'write -P 42 0 1M' "$TEST_IMG.data" | _filter_qemu_io
+
+# We cannot use qemu-img to create the qcow2 image, because it would
+# clear the data file.  Use the blockdev-create job instead, which will
+# only format the qcow2 image file.
+touch "$TEST_IMG"
+_launch_qemu \
+    -blockdev file,node-name=data,filename="$TEST_IMG.data" \
+    -blockdev file,node-name=meta,filename="$TEST_IMG"
+
+_send_qemu_cmd $QEMU_HANDLE '{ "execute": "qmp_capabilities" }' 'return'
+
+_send_qemu_cmd $QEMU_HANDLE \
+    '{ "execute": "blockdev-create",
+       "arguments": {
+           "job-id": "create",
+           "options": {
+               "driver": "qcow2",
+               "size": '"$((1 * 1024 * 1024))"',
+               "file": "meta",
+               "data-file": "data",
+               "data-file-raw": true
+           } } }' \
+    '"status": "concluded"'
+
+_send_qemu_cmd $QEMU_HANDLE \
+    '{ "execute": "job-dismiss", "arguments": { "id": "create" } }' \
+    'return'
+
+_cleanup_qemu
+
+echo
+echo 'Comparing pattern:'
+
+# Reading from either the qcow2 file or the data file should return
+# the same result:
+$QEMU_IO -f raw -c 'read -P 42 0 1M' "$TEST_IMG.data" | _filter_qemu_io
+$QEMU_IO -f $IMGFMT -c 'read -P 42 0 1M' "$TEST_IMG" | _filter_qemu_io
+
+# For good measure
+$QEMU_IMG compare -f raw "$TEST_IMG.data" "$TEST_IMG"
+
+echo
+echo '--- Truncation (growing) ---'
+
+# Append some new data to the raw file, then resize the qcow2 image
+# accordingly and see whether the new data is visible.  Technically
+# that is not allowed, but it is reasonable behavior, so test it.
+truncate -s 2M "$TEST_IMG.data"
+$QEMU_IO -f raw -c 'write -P 84 1M 1M' "$TEST_IMG.data" | _filter_qemu_io
+
+$QEMU_IMG resize "$TEST_IMG" 2M
+
+echo
+echo 'Comparing pattern:'
+
+$QEMU_IO -f raw -c 'read -P 42 0 1M' -c 'read -P 84 1M 1M' "$TEST_IMG.data" \
+    | _filter_qemu_io
+$QEMU_IO -f $IMGFMT -c 'read -P 42 0 1M' -c 'read -P 84 1M 1M' "$TEST_IMG" \
+    | _filter_qemu_io
+
+$QEMU_IMG compare -f raw "$TEST_IMG.data" "$TEST_IMG"
+
+echo
+echo '--- Giving a backing file at runtime ---'
+
+# qcow2 files with data-file-raw cannot have backing files given by
+# their image header, but qemu will allow you to set a backing node at
+# runtime -- it should not have any effect, though (because reading
+# from the qcow2 node should return the same data as reading from the
+# raw node).
+
+_make_test_img -o "data_file=$TEST_IMG.data,data_file_raw=on" 1M
+TEST_IMG="$TEST_IMG.base" _make_test_img 1M
+
+# Write something that is not zero into the base image
+$QEMU_IO -c 'write -P 42 0 1M' "$TEST_IMG.base" | _filter_qemu_io
+
+echo
+echo 'Comparing qcow2 image and raw data file:'
+
+# $TEST_IMG and $TEST_IMG.data must show the same data at all times;
+# that is, the qcow2 node must not fall through to the backing image
+# at any point
+$QEMU_IMG compare --image-opts \
+    "driver=raw,file.filename=$TEST_IMG.data"  \
+    "file.filename=$TEST_IMG,backing.file.filename=$TEST_IMG.base"
+
 # success, all done
 echo "*** done"
 rm -f $seq.full
diff --git a/tests/qemu-iotests/244.out b/tests/qemu-iotests/244.out
index 7269b4295a..99f56ac18c 100644
--- a/tests/qemu-iotests/244.out
+++ b/tests/qemu-iotests/244.out
@@ -83,7 +83,7 @@ qcow2 file size after I/O: 327680
 === Standalone image with external data file (valid raw) ===
 
 Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864 data_file=TEST_DIR/t.IMGFMT.data data_file_raw=on
-qcow2 file size before I/O: 196616
+qcow2 file size before I/O: 327680
 
 wrote 4194304/4194304 bytes at offset 1048576
 4 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
@@ -93,11 +93,10 @@ wrote 3145728/3145728 bytes at offset 3145728
 3 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 No errors were found on the image.
 
-[{ "start": 0, "length": 1048576, "depth": 0, "zero": true, "data": false},
-{ "start": 1048576, "length": 1048576, "depth": 0, "zero": false, "data": true, "offset": 1048576},
+[{ "start": 0, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": 0},
 { "start": 2097152, "length": 2097152, "depth": 0, "zero": true, "data": false},
-{ "start": 4194304, "length": 1048576, "depth": 0, "zero": true, "data": false, "offset": 4194304},
-{ "start": 5242880, "length": 61865984, "depth": 0, "zero": true, "data": false}]
+{ "start": 4194304, "length": 2097152, "depth": 0, "zero": true, "data": false, "offset": 4194304},
+{ "start": 6291456, "length": 60817408, "depth": 0, "zero": false, "data": true, "offset": 6291456}]
 
 read 1048576/1048576 bytes at offset 0
 1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
@@ -138,4 +137,63 @@ wrote 512/512 bytes at offset 0
 512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 
 Success: qemu-io failed, so the data file was flushed
+
+=== Preallocation with data-file-raw ===
+
+--- Using a non-zeroed data file ---
+wrote 1048576/1048576 bytes at offset 0
+1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+{ "execute": "qmp_capabilities" }
+{"return": {}}
+{ "execute": "blockdev-create",
+       "arguments": {
+           "job-id": "create",
+           "options": {
+               "driver": "IMGFMT",
+               "size": 1048576,
+               "file": "meta",
+               "data-file": "data",
+               "data-file-raw": true
+           } } }
+{"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": "JOB_STATUS_CHANGE", "data": {"status": "created", "id": "create"}}
+{"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": "JOB_STATUS_CHANGE", "data": {"status": "running", "id": "create"}}
+{"return": {}}
+{"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": "JOB_STATUS_CHANGE", "data": {"status": "waiting", "id": "create"}}
+{"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": "JOB_STATUS_CHANGE", "data": {"status": "pending", "id": "create"}}
+{"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": "JOB_STATUS_CHANGE", "data": {"status": "concluded", "id": "create"}}
+{ "execute": "job-dismiss", "arguments": { "id": "create" } }
+{"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": "JOB_STATUS_CHANGE", "data": {"status": "null", "id": "create"}}
+{"return": {}}
+
+Comparing pattern:
+read 1048576/1048576 bytes at offset 0
+1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+read 1048576/1048576 bytes at offset 0
+1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+Images are identical.
+
+--- Truncation (growing) ---
+wrote 1048576/1048576 bytes at offset 1048576
+1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+Image resized.
+
+Comparing pattern:
+read 1048576/1048576 bytes at offset 0
+1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+read 1048576/1048576 bytes at offset 1048576
+1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+read 1048576/1048576 bytes at offset 0
+1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+read 1048576/1048576 bytes at offset 1048576
+1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+Images are identical.
+
+--- Giving a backing file at runtime ---
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1048576 data_file=TEST_DIR/t.IMGFMT.data data_file_raw=on
+Formatting 'TEST_DIR/t.IMGFMT.base', fmt=IMGFMT size=1048576
+wrote 1048576/1048576 bytes at offset 0
+1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+Comparing qcow2 image and raw data file:
+Images are identical.
 *** done