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[PULL 23/30] file-win32: Support BDRV_REQ_ZERO_WRITE for truncate
From: |
Kevin Wolf |
Subject: |
[PULL 23/30] file-win32: Support BDRV_REQ_ZERO_WRITE for truncate |
Date: |
Fri, 8 May 2020 14:41:28 +0200 |
From: Eric Blake <address@hidden>
When using bdrv_file, .bdrv_has_zero_init_truncate always returns 1;
therefore, we can behave just like file-posix, and always implement
BDRV_REQ_ZERO_WRITE by ignoring it since the OS gives it to us for
free (note that file-posix.c had to use an 'if' because it shared code
between regular files and block devices, but in file-win32.c,
bdrv_host_device uses a separate .bdrv_file_open).
Signed-off-by: Eric Blake <address@hidden>
Message-Id: <address@hidden>
Signed-off-by: Kevin Wolf <address@hidden>
---
block/file-win32.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/block/file-win32.c b/block/file-win32.c
index a6b0dda5c3..fa569685d8 100644
--- a/block/file-win32.c
+++ b/block/file-win32.c
@@ -408,6 +408,9 @@ static int raw_open(BlockDriverState *bs, QDict *options,
int flags,
win32_aio_attach_aio_context(s->aio, bdrv_get_aio_context(bs));
}
+ /* When extending regular files, we get zeros from the OS */
+ bs->supported_truncate_flags = BDRV_REQ_ZERO_WRITE;
+
ret = 0;
fail:
qemu_opts_del(opts);
--
2.25.3
- [PULL 09/30] qcow2: Avoid integer wraparound in qcow2_co_truncate(), (continued)
- [PULL 09/30] qcow2: Avoid integer wraparound in qcow2_co_truncate(), Kevin Wolf, 2020/05/08
- [PULL 16/30] iotests/283: Use consistent size for source and target, Kevin Wolf, 2020/05/08
- [PULL 18/30] backup: Make sure that source and target size match, Kevin Wolf, 2020/05/08
- [PULL 20/30] iotests/055: Use cache.no-flush for vmdk target, Kevin Wolf, 2020/05/08
- [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 <=
- [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, 2020/05/08
- [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