block/vpc: return ZERO block-status when appropriate

In case when get_image_offset() returns -1, we do zero out the
corresponding chunk of qiov. So, this should be reported as ZERO.

Note that this changes visible output of "qemu-img map --output=json"
and "qemu-io -c map" commands. For qemu-img map, the change is obvious:
we just mark as zero what is really zero. For qemu-io it's less
obvious: what was unallocated now is allocated.

There is an inconsistency in understanding of unallocated regions in
Qemu: backing-supporting format-drivers return 0 block-status to report
go-to-backing logic for this area. Some protocol-drivers (iscsi) return
0 to report fs-unallocated-non-zero status (i.e., don't occupy space on
disk, read result is undefined).

BDRV_BLOCK_ALLOCATED is defined as something more close to
go-to-backing logic. Still it is calculated as ZERO | DATA, so 0 from
iscsi is treated as unallocated. It doesn't influence backing-chain
behavior, as iscsi can't have backing file. But it does influence
"qemu-io -c map".

We should solve this inconsistency at some future point. Now, let's
just make backing-not-supporting format drivers (vdi in the previous
patch and vpc now) to behave more like backing-supporting drivers
and not report 0 block-status. More over, returning ZERO status is
absolutely valid thing, and again, corresponds to how the other
format-drivers (backing-supporting) work.

After block-status update, it never reports 0, so setting
unallocated_blocks_are_zero doesn't make sense (as the only user of it
is bdrv_co_block_status and it checks unallocated_blocks_are_zero only
for unallocated areas). Drop it.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <20200528094405.145708-5-vsementsov@virtuozzo.com>
[mreitz: qemu-io -c map as used by iotest 146 now reports everything as
         allocated; in order to make the test do something useful, we
         use qemu-img map --output=json now]
Signed-off-by: Max Reitz <mreitz@redhat.com>

3 files changed, 436 insertions, 32 deletions

diff --git a/block/vpc.c b/block/vpc.c
index c055591641..01fcd37e3c 100644
--- a/block/vpc.c
+++ b/block/vpc.c
@@ -606,7 +606,6 @@ static int vpc_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
         bdi->cluster_size = s->block_size;
     }
 
-    bdi->unallocated_blocks_are_zero = true;
     return 0;
 }
 
@@ -745,7 +744,7 @@ static int coroutine_fn vpc_co_block_status(BlockDriverState *bs,
     image_offset = get_image_offset(bs, offset, false, NULL);
     allocated = (image_offset != -1);
     *pnum = 0;
-    ret = 0;
+    ret = BDRV_BLOCK_ZERO;
 
     do {
         /* All sectors in a block are contiguous (without using the bitmap) */
diff --git a/tests/qemu-iotests/146 b/tests/qemu-iotests/146
index 2e43abddfc..ddc3c1fd80 100755
--- a/tests/qemu-iotests/146
+++ b/tests/qemu-iotests/146
@@ -51,19 +51,25 @@ echo === Testing VPC Autodetect ===
 echo
 _use_sample_img virtualpc-dynamic.vhd.bz2
 
-${QEMU_IO} -c "open -o driver=vpc ${TEST_IMG}" -c 'map'
+$QEMU_IMG map --output=json --image-opts \
+    "driver=vpc,file.filename=$TEST_IMG" \
+    | _filter_qemu_img_map
 
 echo
 echo === Testing VPC with current_size force ===
 echo
 
-${QEMU_IO} -c "open -o driver=vpc,force_size_calc=current_size ${TEST_IMG}" -c 'map'
+$QEMU_IMG map --output=json --image-opts \
+    "driver=vpc,force_size_calc=current_size,file.filename=$TEST_IMG" \
+    | _filter_qemu_img_map
 
 echo
 echo === Testing VPC with chs force ===
 echo
 
-${QEMU_IO} -c "open -o driver=vpc,force_size_calc=chs ${TEST_IMG}" -c 'map'
+$QEMU_IMG map --output=json --image-opts \
+    "driver=vpc,force_size_calc=chs,file.filename=$TEST_IMG" \
+    | _filter_qemu_img_map
 
 _cleanup_test_img
 
@@ -72,19 +78,25 @@ echo === Testing Hyper-V Autodetect ===
 echo
 _use_sample_img hyperv2012r2-dynamic.vhd.bz2
 
-${QEMU_IO} -c "open -o driver=vpc ${TEST_IMG}" -c 'map'
+$QEMU_IMG map --output=json --image-opts \
+    "driver=vpc,file.filename=$TEST_IMG" \
+    | _filter_qemu_img_map
 
 echo
 echo === Testing Hyper-V with current_size force ===
 echo
 
-${QEMU_IO} -c "open -o driver=vpc,force_size_calc=current_size ${TEST_IMG}" -c 'map'
+$QEMU_IMG map --output=json --image-opts \
+    "driver=vpc,force_size_calc=current_size,file.filename=$TEST_IMG" \
+    | _filter_qemu_img_map
 
 echo
 echo === Testing Hyper-V with chs force ===
 echo
 
-${QEMU_IO} -c "open -o driver=vpc,force_size_calc=chs ${TEST_IMG}" -c 'map'
+$QEMU_IMG map --output=json --image-opts \
+    "driver=vpc,force_size_calc=chs,file.filename=$TEST_IMG" \
+    | _filter_qemu_img_map
 
 _cleanup_test_img
 
@@ -93,19 +105,25 @@ echo === Testing d2v Autodetect ===
 echo
 _use_sample_img d2v-zerofilled.vhd.bz2
 
-${QEMU_IO} -c "open -o driver=vpc ${TEST_IMG}" -c 'map'
+$QEMU_IMG map --output=json --image-opts \
+    "driver=vpc,file.filename=$TEST_IMG" \
+    | _filter_qemu_img_map
 
 echo
 echo === Testing d2v with current_size force ===
 echo
 
-${QEMU_IO} -c "open -o driver=vpc,force_size_calc=current_size ${TEST_IMG}" -c 'map'
+$QEMU_IMG map --output=json --image-opts \
+    "driver=vpc,force_size_calc=current_size,file.filename=$TEST_IMG" \
+    | _filter_qemu_img_map
 
 echo
 echo === Testing d2v with chs force ===
 echo
 
-${QEMU_IO} -c "open -o driver=vpc,force_size_calc=chs ${TEST_IMG}" -c 'map'
+$QEMU_IMG map --output=json --image-opts \
+    "driver=vpc,force_size_calc=chs,file.filename=$TEST_IMG" \
+    | _filter_qemu_img_map
 
 _cleanup_test_img
 
@@ -121,19 +139,25 @@ echo
 echo === Read created image, default opts ====
 echo
 
-${QEMU_IO} -c "open -o driver=vpc ${TEST_IMG}" -c 'map'
+$QEMU_IMG map --output=json --image-opts \
+    "driver=vpc,file.filename=$TEST_IMG" \
+    | _filter_qemu_img_map
 
 echo
 echo === Read created image, force_size_calc=chs ====
 echo
 
-${QEMU_IO} -c "open -o driver=vpc,force_size_calc=chs ${TEST_IMG}" -c 'map'
+$QEMU_IMG map --output=json --image-opts \
+    "driver=vpc,force_size_calc=chs,file.filename=$TEST_IMG" \
+    | _filter_qemu_img_map
 
 echo
 echo === Read created image, force_size_calc=current_size ====
 echo
 
-${QEMU_IO} -c "open -o driver=vpc,force_size_calc=current_size ${TEST_IMG}" -c 'map'
+$QEMU_IMG map --output=json --image-opts \
+    "driver=vpc,force_size_calc=current_size,file.filename=$TEST_IMG" \
+    | _filter_qemu_img_map
 
 echo
 echo === Testing Image create, force_size ===
@@ -145,19 +169,25 @@ echo
 echo === Read created image, default opts ====
 echo
 
-${QEMU_IO} -c "open -o driver=vpc ${TEST_IMG}" -c 'map'
+$QEMU_IMG map --output=json --image-opts \
+    "driver=vpc,file.filename=$TEST_IMG" \
+    | _filter_qemu_img_map
 
 echo
 echo === Read created image, force_size_calc=chs ====
 echo
 
-${QEMU_IO} -c "open -o driver=vpc,force_size_calc=chs ${TEST_IMG}" -c 'map'
+$QEMU_IMG map --output=json --image-opts \
+    "driver=vpc,force_size_calc=chs,file.filename=$TEST_IMG" \
+    | _filter_qemu_img_map
 
 echo
 echo === Read created image, force_size_calc=current_size ====
 echo
 
-${QEMU_IO} -c "open -o driver=vpc,force_size_calc=current_size ${TEST_IMG}" -c 'map'
+$QEMU_IMG map --output=json --image-opts \
+    "driver=vpc,force_size_calc=current_size,file.filename=$TEST_IMG" \
+    | _filter_qemu_img_map
 
 echo "*** done"
 rm -f $seq.full
diff --git a/tests/qemu-iotests/146.out b/tests/qemu-iotests/146.out
index 1332189d87..80513cdd06 100644
--- a/tests/qemu-iotests/146.out
+++ b/tests/qemu-iotests/146.out
@@ -2,39 +2,414 @@ QA output created by 146
 
 === Testing VPC Autodetect ===
 
-126.998 GiB (0x1fbfe04000) bytes not allocated at offset 0 bytes (0x0)
+[{ "start": 0, "length": 136363130880, "depth": 0, "zero": true, "data": false }]
 
 === Testing VPC with current_size force ===
 
-127 GiB (0x1fc0000000) bytes not allocated at offset 0 bytes (0x0)
+[{ "start": 0, "length": 136365211648, "depth": 0, "zero": true, "data": false }]
 
 === Testing VPC with chs force ===
 
-126.998 GiB (0x1fbfe04000) bytes not allocated at offset 0 bytes (0x0)
+[{ "start": 0, "length": 136363130880, "depth": 0, "zero": true, "data": false }]
 
 === Testing Hyper-V Autodetect ===
 
-127 GiB (0x1fc0000000) bytes not allocated at offset 0 bytes (0x0)
+[{ "start": 0, "length": 136365211648, "depth": 0, "zero": true, "data": false }]
 
 === Testing Hyper-V with current_size force ===
 
-127 GiB (0x1fc0000000) bytes not allocated at offset 0 bytes (0x0)
+[{ "start": 0, "length": 136365211648, "depth": 0, "zero": true, "data": false }]
 
 === Testing Hyper-V with chs force ===
 
-126.998 GiB (0x1fbfe04000) bytes not allocated at offset 0 bytes (0x0)
+[{ "start": 0, "length": 136363130880, "depth": 0, "zero": true, "data": false }]
 
 === Testing d2v Autodetect ===
 
-251.250 MiB (0xfb40000) bytes     allocated at offset 0 bytes (0x0)
+[{ "start": 0, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 2097152, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 4194304, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 6291456, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 8388608, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
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+{ "start": 14680064, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 16777216, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
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+{ "start": 247463936, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 249561088, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 251658240, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 253755392, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 255852544, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 257949696, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 260046848, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 262144000, "length": 1310720, "depth": 0, "zero": false, "data": true, "offset": OFFSET }]
 
 === Testing d2v with current_size force ===
 
-251.250 MiB (0xfb40000) bytes     allocated at offset 0 bytes (0x0)
+[{ "start": 0, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 2097152, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 4194304, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 6291456, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 8388608, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 10485760, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 12582912, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 14680064, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 16777216, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 18874368, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 20971520, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 23068672, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 25165824, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 27262976, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 29360128, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 31457280, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 33554432, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 35651584, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 37748736, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 39845888, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 41943040, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 44040192, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 46137344, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 48234496, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 50331648, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 52428800, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 54525952, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 56623104, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 58720256, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 60817408, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 62914560, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 65011712, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 67108864, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 69206016, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 71303168, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 73400320, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 75497472, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 77594624, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 79691776, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 81788928, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 83886080, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 85983232, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 88080384, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 90177536, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 92274688, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 94371840, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 96468992, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 98566144, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 100663296, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 102760448, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 104857600, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 106954752, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 109051904, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 111149056, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 113246208, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 115343360, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 117440512, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 119537664, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 121634816, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 123731968, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 125829120, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 127926272, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 130023424, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 132120576, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 134217728, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 136314880, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 138412032, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 140509184, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 142606336, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 144703488, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 146800640, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 148897792, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 150994944, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 153092096, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 155189248, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 157286400, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 159383552, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 161480704, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 163577856, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 165675008, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 167772160, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 169869312, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 171966464, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 174063616, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 176160768, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 178257920, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 180355072, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 182452224, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 184549376, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 186646528, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 188743680, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 190840832, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 192937984, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 195035136, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 197132288, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 199229440, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 201326592, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 203423744, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 205520896, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 207618048, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 209715200, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 211812352, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 213909504, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 216006656, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 218103808, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 220200960, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 222298112, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 224395264, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 226492416, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 228589568, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 230686720, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 232783872, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 234881024, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 236978176, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 239075328, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 241172480, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 243269632, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 245366784, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 247463936, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 249561088, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 251658240, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 253755392, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 255852544, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 257949696, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 260046848, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 262144000, "length": 1310720, "depth": 0, "zero": false, "data": true, "offset": OFFSET }]
 
 === Testing d2v with chs force ===
 
-251.250 MiB (0xfb40000) bytes     allocated at offset 0 bytes (0x0)
+[{ "start": 0, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 2097152, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 4194304, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 6291456, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 8388608, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 10485760, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 12582912, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 14680064, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 16777216, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 18874368, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 20971520, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 23068672, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 25165824, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 27262976, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 29360128, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 31457280, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 33554432, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 35651584, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 37748736, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 39845888, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 41943040, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 44040192, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 46137344, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 48234496, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 50331648, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 52428800, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 54525952, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 56623104, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 58720256, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 60817408, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 62914560, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 65011712, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 67108864, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 69206016, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 71303168, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 73400320, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 75497472, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 77594624, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 79691776, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 81788928, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 83886080, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 85983232, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 88080384, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 90177536, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 92274688, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 94371840, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 96468992, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 98566144, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 100663296, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 102760448, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 104857600, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 106954752, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 109051904, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 111149056, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 113246208, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 115343360, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 117440512, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 119537664, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 121634816, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 123731968, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 125829120, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 127926272, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 130023424, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 132120576, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 134217728, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 136314880, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 138412032, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 140509184, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 142606336, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
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+{ "start": 239075328, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 241172480, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
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+{ "start": 247463936, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 249561088, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 251658240, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 253755392, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 255852544, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 257949696, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 260046848, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": OFFSET },
+{ "start": 262144000, "length": 1310720, "depth": 0, "zero": false, "data": true, "offset": OFFSET }]
 
 === Testing Image create, default ===
 
@@ -42,15 +417,15 @@ Formatting 'TEST_DIR/IMGFMT-create-test.IMGFMT', fmt=IMGFMT size=4294967296
 
 === Read created image, default opts ====
 
-4 GiB (0x10007a000) bytes not allocated at offset 0 bytes (0x0)
+[{ "start": 0, "length": 4295467008, "depth": 0, "zero": true, "data": false }]
 
 === Read created image, force_size_calc=chs ====
 
-4 GiB (0x10007a000) bytes not allocated at offset 0 bytes (0x0)
+[{ "start": 0, "length": 4295467008, "depth": 0, "zero": true, "data": false }]
 
 === Read created image, force_size_calc=current_size ====
 
-4 GiB (0x10007a000) bytes not allocated at offset 0 bytes (0x0)
+[{ "start": 0, "length": 4295467008, "depth": 0, "zero": true, "data": false }]
 
 === Testing Image create, force_size ===
 
@@ -58,13 +433,13 @@ Formatting 'TEST_DIR/IMGFMT-create-test.IMGFMT', fmt=IMGFMT size=4294967296
 
 === Read created image, default opts ====
 
-4 GiB (0x100000000) bytes not allocated at offset 0 bytes (0x0)
+[{ "start": 0, "length": 4294967296, "depth": 0, "zero": true, "data": false }]
 
 === Read created image, force_size_calc=chs ====
 
-4 GiB (0x100000000) bytes not allocated at offset 0 bytes (0x0)
+[{ "start": 0, "length": 4294967296, "depth": 0, "zero": true, "data": false }]
 
 === Read created image, force_size_calc=current_size ====
 
-4 GiB (0x100000000) bytes not allocated at offset 0 bytes (0x0)
+[{ "start": 0, "length": 4294967296, "depth": 0, "zero": true, "data": false }]
 *** done