On 14/11/2017 7:50 PM, Eric Blake wrote:
On 11/14/2017 04:16 AM, Anton Nefedov wrote:
Misaligned compressed write is not supported.
Signed-off-by: Anton Nefedov <anton.nefe...@virtuozzo.com>
---
block/qcow2.c | 4 ++++
1 file changed, 4 insertions(+)
Should this one be applied in 2.11?
For the record, this one is pretty hard to trigger; backup and qemu-img
convert currently use compressed write, both make sure they operate in
clusters.
qemu-io is almighty though
qemu-io> write -c -P 7 512 64k
wrote 65536/65536 bytes at offset 512
64 KiB, 1 ops; 0.0187 sec (3.329 MiB/sec and 53.2566 ops/sec)
qemu-io> read -P 7 512 64k
Pattern verification failed at offset 512, 65536 bytes
read 65536/65536 bytes at offset 512
64 KiB, 1 ops; 0.0002 sec (248.016 MiB/sec and 3968.2540 ops/sec)
qemu-io> read -P 7 0 64k
read 65536/65536 bytes at offset 0
64 KiB, 1 ops; 0.0000 sec (1.606 GiB/sec and 26315.7895 ops/sec)
/Anton
