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block: Advertise BDRV_REQ_NO_FALLBACK in filter drivers

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Filter drivers that support .bdrv_co_pwrite_zeroes can safely advertise
BDRV_REQ_NO_FALLBACK because they just forward the request flags to
their child node.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Acked-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Kevin Wolf 2019-03-22 13:42:39 +01:00
parent fe0480d629
commit 80f5c33ff3
4 changed files with 7 additions and 7 deletions
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3
block/mirror.c
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@ -1548,7 +1548,8 @@ static void mirror_start_job(const char *job_id, BlockDriverState *bs,
}
mirror_top_bs->total_sectors = bs->total_sectors;
mirror_top_bs->supported_write_flags = BDRV_REQ_WRITE_UNCHANGED;
mirror_top_bs->supported_zero_flags = BDRV_REQ_WRITE_UNCHANGED;
mirror_top_bs->supported_zero_flags = BDRV_REQ_WRITE_UNCHANGED |
BDRV_REQ_NO_FALLBACK;
bs_opaque = g_new0(MirrorBDSOpaque, 1);
mirror_top_bs->opaque = bs_opaque;
bdrv_set_aio_context(mirror_top_bs, bdrv_get_aio_context(bs));