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[PULL 24/30] nfs: Support BDRV_REQ_ZERO_WRITE for truncate


From: Kevin Wolf
Subject: [PULL 24/30] nfs: Support BDRV_REQ_ZERO_WRITE for truncate
Date: Fri, 8 May 2020 14:41:29 +0200

From: Eric Blake <address@hidden>

Our .bdrv_has_zero_init_truncate returns 1 if we detect that the OS
always 0-fills; we can use that same knowledge to implement
BDRV_REQ_ZERO_WRITE by ignoring it when the OS gives it to us for
free.

Signed-off-by: Eric Blake <address@hidden>
Message-Id: <address@hidden>
Signed-off-by: Kevin Wolf <address@hidden>
---
 block/nfs.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/block/nfs.c b/block/nfs.c
index 385d756e1d..76daa7c9f6 100644
--- a/block/nfs.c
+++ b/block/nfs.c
@@ -620,6 +620,9 @@ static int nfs_file_open(BlockDriverState *bs, QDict 
*options, int flags,
     }
 
     bs->total_sectors = ret;
+    if (client->has_zero_init) {
+        bs->supported_truncate_flags = BDRV_REQ_ZERO_WRITE;
+    }
     return 0;
 }
 
-- 
2.25.3




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