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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
- [PULL 15/30] iotests: vmdk: Enable zeroed_grained=on by default, (continued)
- [PULL 15/30] iotests: vmdk: Enable zeroed_grained=on by default, Kevin Wolf, 2020/05/08
- [PULL 17/30] backup: Improve error for bdrv_getlength() failure, Kevin Wolf, 2020/05/08
- [PULL 26/30] sheepdog: Support BDRV_REQ_ZERO_WRITE for truncate, Kevin Wolf, 2020/05/08
- [PULL 30/30] block: Drop unused .bdrv_has_zero_init_truncate, Kevin Wolf, 2020/05/08
- [PULL 29/30] vhdx: Rework truncation logic, Kevin Wolf, 2020/05/08
- [PULL 21/30] qcow2: Fix preallocation on block devices, Kevin Wolf, 2020/05/08
- [PULL 23/30] file-win32: Support BDRV_REQ_ZERO_WRITE for truncate, Kevin Wolf, 2020/05/08
- [PULL 19/30] iotests: Backup with different source/target size, Kevin Wolf, 2020/05/08
- [PULL 25/30] rbd: Support BDRV_REQ_ZERO_WRITE for truncate, Kevin Wolf, 2020/05/08
- [PULL 27/30] ssh: Support BDRV_REQ_ZERO_WRITE for truncate, Kevin Wolf, 2020/05/08
- [PULL 24/30] nfs: Support BDRV_REQ_ZERO_WRITE for truncate,
Kevin Wolf <=
- [PULL 28/30] parallels: Rework truncation logic, Kevin Wolf, 2020/05/08
- [PULL 22/30] gluster: Drop useless has_zero_init callback, Kevin Wolf, 2020/05/08
- Re: [PULL 00/30] Block layer patches, Peter Maydell, 2020/05/08