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288b6c9e78913401fac4880b3281ce431540b8df
qemu/tests/qemu-iotests/122.out
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Fiona Ebner 901ac73874 qemu-img: convert: flush target image after copying 
With 'qemu-img convert', when using a cache mode with 'cache.no-flush
= off', the expectation is that the data is flushed to the disk, which
happens since commit 80ccf93b88 ("qemu-img: let 'qemu-img convert'
flush data"). This expectation also encompasses that failure to do so
is properly reported, so ensure that 'qemu-img convert' exits with a
non-zero status code when the target image cannot be flushed.

In particular, the reproducer below [0], based on a report by
Ing. Alfonso Kuen Arroyo [1], would result in
> rc=0
> Content mismatch at offset XYZ!
before this change, and in
> rc=1
> Content mismatch at offset XYZ!
after this change.

Note that this change does not affect the (default) 'unsafe' cache
mode, because bdrv_co_flush() still skips flush to disk for that cache
mode.

[0]:
> #!/bin/bash -x
> dd if=/dev/urandom of=src.raw bs=1M count=500
> truncate -s 500M dst.img
> LOOP=$(losetup --find --show dst.img)
> SIZE=$(blockdev --getsz $LOOP)
> dd if=/dev/zero of=$LOOP bs=1M count=500 conv=fsync status=none
> sync
> echo 3 > /proc/sys/vm/drop_caches
> dmsetup create flk --table "0 $SIZE flakey $LOOP 0 5 5"
> qemu-img convert -t writeback -p -r 100M -f raw -O raw src.raw /dev/mapper/flk
> echo rc=$?
> sleep 5
> dmsetup remove flk
> qemu-img compare src.raw $LOOP
> losetup -d $LOOP
> rm src.raw dst.img

[1]: https://lore.proxmox.com/pve-devel/178961792132.43804.17173233935297903311@idkmanager.com/

Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
Message-ID: <20260930132140.2342574-5-f.ebner@proxmox.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
2026-10-16 09:08:52 -05:00

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QA output created by 122
Formatting 'TEST_DIR/t.IMGFMT.base', fmt=IMGFMT size=67108864
wrote 67108864/67108864 bytes at offset 0
64 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
=== Check allocation status regression with -B ===
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864 backing_file=TEST_DIR/t.IMGFMT.base backing_fmt=IMGFMT
wrote 3145728/3145728 bytes at offset 0
3 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
Offset Length File
0 0x300000 TEST_DIR/t.IMGFMT.orig
0x300000 0x3d00000 TEST_DIR/t.IMGFMT.base
=== Check that zero clusters are kept in overlay ===
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864 backing_file=TEST_DIR/t.IMGFMT.base backing_fmt=IMGFMT
wrote 3145728/3145728 bytes at offset 0
3 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 3145728/3145728 bytes at offset 0
3 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 3145728/3145728 bytes at offset 0
3 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 3145728/3145728 bytes at offset 0
3 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 3145728/3145728 bytes at offset 0
3 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 3145728/3145728 bytes at offset 0
3 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
=== Converting to an overlay larger than its backing file ===
Formatting 'TEST_DIR/t.IMGFMT.base', fmt=IMGFMT size=268435456
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=805306368 backing_file=TEST_DIR/t.IMGFMT.base backing_fmt=IMGFMT
Offset Length File
wrote 1048576/1048576 bytes at offset 267386880
1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 1048576/1048576 bytes at offset 629145600
1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
Offset Length File
0xff00000 0x100000 TEST_DIR/t.IMGFMT.base
0x25800000 0x100000 TEST_DIR/t.IMGFMT.orig
read 1048576/1048576 bytes at offset 267386880
1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 1048576/1048576 bytes at offset 629145600
1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
=== Concatenate multiple source images ===
Formatting 'TEST_DIR/t.IMGFMT.1', fmt=IMGFMT size=4194304
Formatting 'TEST_DIR/t.IMGFMT.2', fmt=IMGFMT size=4194304
Formatting 'TEST_DIR/t.IMGFMT.3', fmt=IMGFMT size=4194304
wrote 65536/65536 bytes at offset 0
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 65536/65536 bytes at offset 0
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 65536/65536 bytes at offset 0
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
Offset Length File
0 0x10000 TEST_DIR/t.IMGFMT
0x400000 0x10000 TEST_DIR/t.IMGFMT
0x800000 0x10000 TEST_DIR/t.IMGFMT
read 65536/65536 bytes at offset 0
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 65536/65536 bytes at offset 4194304
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 65536/65536 bytes at offset 8388608
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
[{ "start": 0, "length": 65536, "depth": 0, "present": true, "zero": false, "data": true, "compressed": true},
{ "start": 65536, "length": 4128768, "depth": 0, "present": false, "zero": true, "data": false, "compressed": false},
{ "start": 4194304, "length": 65536, "depth": 0, "present": true, "zero": false, "data": true, "compressed": true},
{ "start": 4259840, "length": 4128768, "depth": 0, "present": false, "zero": true, "data": false, "compressed": false},
{ "start": 8388608, "length": 65536, "depth": 0, "present": true, "zero": false, "data": true, "compressed": true},
{ "start": 8454144, "length": 4128768, "depth": 0, "present": false, "zero": true, "data": false, "compressed": false}]
read 65536/65536 bytes at offset 0
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 65536/65536 bytes at offset 4194304
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 65536/65536 bytes at offset 8388608
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
qemu-img: Having a backing file for the target makes no sense when concatenating multiple input images
qemu-img: Having a backing file for the target makes no sense when concatenating multiple input images
=== Compression with misaligned allocations and image sizes ===
Formatting 'TEST_DIR/t.IMGFMT.1', fmt=IMGFMT size=1047552
Formatting 'TEST_DIR/t.IMGFMT.2', fmt=IMGFMT size=1047552
wrote 16384/16384 bytes at offset 16384
16 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 133120/133120 bytes at offset 133120
130 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 1024/1024 bytes at offset 1046528
1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 1024/1024 bytes at offset 0
1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
[{ "start": 0, "length": 65536, "depth": 0, "present": true, "zero": false, "data": true, "compressed": true},
{ "start": 65536, "length": 65536, "depth": 0, "present": false, "zero": true, "data": false, "compressed": false},
{ "start": 131072, "length": 196608, "depth": 0, "present": true, "zero": false, "data": true, "compressed": true},
{ "start": 327680, "length": 655360, "depth": 0, "present": false, "zero": true, "data": false, "compressed": false},
{ "start": 983040, "length": 65536, "depth": 0, "present": true, "zero": false, "data": true, "compressed": true},
{ "start": 1048576, "length": 1046528, "depth": 0, "present": false, "zero": true, "data": false, "compressed": false}]
read 16384/16384 bytes at offset 0
16 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 16384/16384 bytes at offset 16384
16 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 100352/100352 bytes at offset 32768
98 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 133120/133120 bytes at offset 133120
130 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 780288/780288 bytes at offset 266240
762 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 1024/1024 bytes at offset 1046528
1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 1024/1024 bytes at offset 1047552
1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 1046528/1046528 bytes at offset 1048576
1022 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
=== Full allocation with -S 0 ===
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864
wrote 3145728/3145728 bytes at offset 0
3 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 3145728/3145728 bytes at offset 3145728
3 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
convert -S 0:
read 3145728/3145728 bytes at offset 0
3 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 63963136/63963136 bytes at offset 3145728
61 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
[{ "start": 0, "length": 67108864, "depth": 0, "present": true, "zero": false, "data": true, "compressed": false, "offset": OFFSET}]
convert -c -S 0:
read 3145728/3145728 bytes at offset 0
3 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 63963136/63963136 bytes at offset 3145728
61 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
[{ "start": 0, "length": 67108864, "depth": 0, "present": true, "zero": false, "data": true, "compressed": true}]
Formatting 'TEST_DIR/t.IMGFMT.base', fmt=IMGFMT size=67108864
wrote 33554432/33554432 bytes at offset 0
32 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864 backing_file=TEST_DIR/t.IMGFMT.base backing_fmt=IMGFMT
wrote 3145728/3145728 bytes at offset 0
3 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
convert -S 0 with source backing file:
read 3145728/3145728 bytes at offset 0
3 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 30408704/30408704 bytes at offset 3145728
29 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 33554432/33554432 bytes at offset 33554432
32 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
[{ "start": 0, "length": 67108864, "depth": 0, "present": true, "zero": false, "data": true, "compressed": false, "offset": OFFSET}]
convert -c -S 0 with source backing file:
read 3145728/3145728 bytes at offset 0
3 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 30408704/30408704 bytes at offset 3145728
29 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 33554432/33554432 bytes at offset 33554432
32 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
[{ "start": 0, "length": 67108864, "depth": 0, "present": true, "zero": false, "data": true, "compressed": true}]
convert -S 0 -B ...
read 3145728/3145728 bytes at offset 0
3 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 30408704/30408704 bytes at offset 3145728
29 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 33554432/33554432 bytes at offset 33554432
32 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
[{ "start": 0, "length": 67108864, "depth": 0, "present": true, "zero": false, "data": true, "compressed": false, "offset": OFFSET}]
convert -c -S 0 -B ...
read 3145728/3145728 bytes at offset 0
3 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 30408704/30408704 bytes at offset 3145728
29 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 33554432/33554432 bytes at offset 33554432
32 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
[{ "start": 0, "length": 67108864, "depth": 0, "present": true, "zero": false, "data": true, "compressed": true}]
=== Non-zero -S ===
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864
wrote 65536/65536 bytes at offset 0
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 1024/1024 bytes at offset 0
1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 1024/1024 bytes at offset 8192
1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 1024/1024 bytes at offset 17408
1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 1024/1024 bytes at offset 66560
1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
convert -S 4k
[{ "start": 0, "length": 4096, "depth": 0, "present": true, "zero": false, "data": true, "compressed": false, "offset": OFFSET},
{ "start": 4096, "length": 4096, "depth": 0, "present": false, "zero": true, "data": false, "compressed": false},
{ "start": 8192, "length": 4096, "depth": 0, "present": true, "zero": false, "data": true, "compressed": false, "offset": OFFSET},
{ "start": 12288, "length": 4096, "depth": 0, "present": false, "zero": true, "data": false, "compressed": false},
{ "start": 16384, "length": 4096, "depth": 0, "present": true, "zero": false, "data": true, "compressed": false, "offset": OFFSET},
{ "start": 20480, "length": 67088384, "depth": 0, "present": false, "zero": true, "data": false, "compressed": false}]
convert -c -S 4k
[{ "start": 0, "length": 1024, "depth": 0, "present": true, "zero": false, "data": true, "compressed": true},
{ "start": 1024, "length": 7168, "depth": 0, "present": false, "zero": true, "data": false, "compressed": false},
{ "start": 8192, "length": 1024, "depth": 0, "present": true, "zero": false, "data": true, "compressed": true},
{ "start": 9216, "length": 8192, "depth": 0, "present": false, "zero": true, "data": false, "compressed": false},
{ "start": 17408, "length": 1024, "depth": 0, "present": true, "zero": false, "data": true, "compressed": true},
{ "start": 18432, "length": 67090432, "depth": 0, "present": false, "zero": true, "data": false, "compressed": false}]
convert -S 8k
[{ "start": 0, "length": 24576, "depth": 0, "present": true, "zero": false, "data": true, "compressed": false, "offset": OFFSET},
{ "start": 24576, "length": 67084288, "depth": 0, "present": false, "zero": true, "data": false, "compressed": false}]
convert -c -S 8k
[{ "start": 0, "length": 1024, "depth": 0, "present": true, "zero": false, "data": true, "compressed": true},
{ "start": 1024, "length": 7168, "depth": 0, "present": false, "zero": true, "data": false, "compressed": false},
{ "start": 8192, "length": 1024, "depth": 0, "present": true, "zero": false, "data": true, "compressed": true},
{ "start": 9216, "length": 8192, "depth": 0, "present": false, "zero": true, "data": false, "compressed": false},
{ "start": 17408, "length": 1024, "depth": 0, "present": true, "zero": false, "data": true, "compressed": true},
{ "start": 18432, "length": 67090432, "depth": 0, "present": false, "zero": true, "data": false, "compressed": false}]
=== -n to a non-zero image ===
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864
Formatting 'TEST_DIR/t.IMGFMT.orig', fmt=IMGFMT size=67108864
wrote 65536/65536 bytes at offset 0
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
Images are identical.
=== -n to an empty image ===
Formatting 'TEST_DIR/t.IMGFMT.orig', fmt=IMGFMT size=67108864
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864
[{ "start": 0, "length": 67108864, "depth": 0, "present": true, "zero": true, "data": false, "compressed": false}]
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864
[{ "start": 0, "length": 67108864, "depth": 0, "present": false, "zero": true, "data": false, "compressed": false}]
=== -n to an empty image with a backing file ===
Formatting 'TEST_DIR/t.IMGFMT.orig', fmt=IMGFMT size=67108864
Formatting 'TEST_DIR/t.IMGFMT.base', fmt=IMGFMT size=67108864
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864 backing_file=TEST_DIR/t.IMGFMT.base backing_fmt=IMGFMT
[{ "start": 0, "length": 67108864, "depth": 0, "present": true, "zero": true, "data": false, "compressed": false}]
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864 backing_file=TEST_DIR/t.IMGFMT.base backing_fmt=IMGFMT
[{ "start": 0, "length": 67108864, "depth": 0, "present": true, "zero": false, "data": true, "compressed": false, "offset": 327680}]
=== -n -B to an image without a backing file ===
Formatting 'TEST_DIR/t.IMGFMT.base', fmt=IMGFMT size=67108864
Formatting 'TEST_DIR/t.IMGFMT.orig', fmt=IMGFMT size=67108864
=== -n incompatible with -o ===
qemu-img: -o has no effect when skipping image creation
=== failing flush after convert with default ('unsafe') cache mode ===
Formatting 'TEST_DIR/t.IMGFMT.orig', fmt=IMGFMT size=1048576
Formatting 'TEST_DIR/t.IMGFMT', 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)
qemu-img convert exited with status 0
=== failing flush after convert with 'writeback' cache mode ===
qemu-img: Failed to flush target image: Input/output error
qemu-img: Failed flush for 'json:{ /* filtered */ }' during close: Input/output error
qemu-img: Failed to flush the L2 table cache: Input/output error
qemu-img: Failed to flush the refcount block cache: Input/output error
qemu-img: Failed flush for 'json:{ /* filtered */ }' during close: Input/output error
qemu-img convert exited with status 1
*** done
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