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Re: [Qemu-block] [PATCH v6 11/42] block: Add bdrv_supports_compressed_wr

From: Kevin Wolf
Subject: Re: [Qemu-block] [PATCH v6 11/42] block: Add bdrv_supports_compressed_writes()
Date: Thu, 5 Sep 2019 15:11:29 +0200
User-agent: Mutt/1.12.0 (2019-05-25)

Am 09.08.2019 um 18:13 hat Max Reitz geschrieben:
> Filters cannot compress data themselves but they have to implement
> .bdrv_co_pwritev_compressed() still (or they cannot forward compressed
> writes).  Therefore, checking whether
> bs->drv->bdrv_co_pwritev_compressed is non-NULL is not sufficient to
> know whether the node can actually handle compressed writes.  This
> function looks down the filter chain to see whether there is a
> non-filter that can actually convert the compressed writes into
> compressed data (and thus normal writes).
> Signed-off-by: Max Reitz <address@hidden>
> Reviewed-by: Vladimir Sementsov-Ogievskiy <address@hidden>

Should patches 2 and 3 that add the .bdrv_co_pwritev_compressed()
callback to filter drivers come only after this one? And should we also
support it in the mirror filter?


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