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[PATCH v3 2/4] block/nbd: define new max_write_zero_fast limit
From: |
Vladimir Sementsov-Ogievskiy |
Subject: |
[PATCH v3 2/4] block/nbd: define new max_write_zero_fast limit |
Date: |
Wed, 10 Jun 2020 21:23:03 +0300 |
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 <vsementsov@virtuozzo.com>
---
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)
bs->bl.request_alignment = min;
bs->bl.max_pdiscard = QEMU_ALIGN_DOWN(INT_MAX, min);
+ bs->bl.max_pwrite_zeroes_fast = bs->bl.max_pdiscard;
bs->bl.max_pwrite_zeroes = max;
bs->bl.max_transfer = max;
--
2.21.0