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charset="utf-8" The NBD spec was recently updated to clarify that max_block doesn't relate to NBD_CMD_WRITE_ZEROES with NBD_CMD_FLAG_FAST_ZERO (which mirrors Qemu flag BDRV_REQ_NO_FALLBACK). bs->bl.max_write_zero_fast is zero by default which means using max_pwrite_zeroes. Update nbd driver to allow larger requests with BDRV_REQ_NO_FALLBACK. Signed-off-by: Vladimir Sementsov-Ogievskiy --- block/nbd.c | 1 + 1 file changed, 1 insertion(+) diff --git a/block/nbd.c b/block/nbd.c index 4ac23c8f62..b0584cf68d 100644 --- a/block/nbd.c +++ b/block/nbd.c @@ -1956,6 +1956,7 @@ static void nbd_refresh_limits(BlockDriverState *bs, = Error **errp) =20 bs->bl.request_alignment =3D min; bs->bl.max_pdiscard =3D QEMU_ALIGN_DOWN(INT_MAX, min); + bs->bl.max_pwrite_zeroes_fast =3D bs->bl.max_pdiscard; bs->bl.max_pwrite_zeroes =3D max; bs->bl.max_transfer =3D max; =20 --=20 2.21.0