On Wed 16 Jan 2019 10:32:33 AM CET, Anton Nefedov wrote:
>>> +ret = handle_alloc_space(bs, l2meta);
>>
>> I insist that it would be nice to have a short comment explaining
>> what this does.
>
> Right sorry forgot your comment.
> I'd go with:
>
> +/* Try to efficiently initialize
On 15/1/2019 6:27 PM, Alberto Garcia wrote:
> On Mon 14 Jan 2019 12:18:30 PM CET, Anton Nefedov wrote:
>> If COW areas of the newly allocated clusters are zeroes on the backing image,
>> efficient bdrv_write_zeroes(flags=BDRV_REQ_ALLOCATE) can be used on the whole
>> cluster instead of writing
On Mon 14 Jan 2019 12:18:30 PM CET, Anton Nefedov wrote:
> If COW areas of the newly allocated clusters are zeroes on the backing image,
> efficient bdrv_write_zeroes(flags=BDRV_REQ_ALLOCATE) can be used on the whole
> cluster instead of writing explicit zero buffers later in perform_cow().
>
>
If COW areas of the newly allocated clusters are zeroes on the backing image,
efficient bdrv_write_zeroes(flags=BDRV_REQ_ALLOCATE) can be used on the whole
cluster instead of writing explicit zero buffers later in perform_cow().
iotest 060:
write to the discarded cluster does not trigger COW
