[pve-devel] [PATCH pve-qemu-kvm] Force enable rbd cache for qmrestore v2

[Thomas Lamprecht]

Hi, first thanks for the contribution! Not commenting on the code itself 
but we need a CLA for being able to add your contributions,
we use the Harmony CLA, a community-centered CLA for FOSS projects,
see 
https://pve.proxmox.com/wiki/Developer_Documentation#Software_License_and_Copyright

Also I would suggest using git format-patch and git send-email for 
sending the patch to the mailing list, so it is ensured that it can be 
applied here without problems.
A small example of the necessary commands can be found at 
https://pve.proxmox.com/wiki/Developer_Documentation#Git_commands_summary

Cheers,
Thomas


On 07/26/2016 01:29 PM, Eneko Lacunza wrote:
> Hi,
>
> I just tested this patch to work as well as the previous one. Instead 
> of setting rbd_cache_writethrough_until_flush=false in devfn, issue a 
> bogus flush so that Ceph activated rbd cache.
>
> ---
> Index: b/vma.c
> ===================================================================
> --- a/vma.c
> +++ b/vma.c
> @@ -335,6 +335,9 @@ static int extract_content(int argc, cha
>
>             BlockDriverState *bs = blk_bs(blk);
>
> +            /* This is needed to activate rbd cache 
> (writeback/coalesce) */
> +            bdrv_flush(bs);
> +
>              if (vma_reader_register_bs(vmar, i, bs, write_zero, 
> &errp) < 0) {
>                  g_error("%s", error_get_pretty(errp));
>              }
>
>