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[PATCH 6/9] ssh: Support BDRV_REQ_ZERO_WRITE for truncate
From: |
Eric Blake |
Subject: |
[PATCH 6/9] ssh: Support BDRV_REQ_ZERO_WRITE for truncate |
Date: |
Tue, 28 Apr 2020 15:29:02 -0500 |
Our .bdrv_has_zero_init_truncate can detect when the remote side
always zero fills; we can reuse that same knowledge to implement
BDRV_REQ_ZERO_WRITE by ignoring it when the server gives it to us for
free.
Signed-off-by: Eric Blake <address@hidden>
---
block/ssh.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/block/ssh.c b/block/ssh.c
index 9eb33df8598c..f9e08a490069 100644
--- a/block/ssh.c
+++ b/block/ssh.c
@@ -883,6 +883,10 @@ static int ssh_file_open(BlockDriverState *bs, QDict
*options, int bdrv_flags,
/* Go non-blocking. */
ssh_set_blocking(s->session, 0);
+ if (s->attrs->type == SSH_FILEXFER_TYPE_REGULAR) {
+ bs->supported_truncate_flags = BDRV_REQ_ZERO_WRITE;
+ }
+
qapi_free_BlockdevOptionsSsh(opts);
return 0;
--
2.26.2
- [PATCH 0/9] More truncate improvements, Eric Blake, 2020/04/28
- [PATCH 2/9] file-win32: Support BDRV_REQ_ZERO_WRITE for truncate, Eric Blake, 2020/04/28
- [PATCH 3/9] nfs: Support BDRV_REQ_ZERO_WRITE for truncate, Eric Blake, 2020/04/28
- [PATCH 1/9] gluster: Drop useless has_zero_init callback, Eric Blake, 2020/04/28
- [PATCH 4/9] rbd: Support BDRV_REQ_ZERO_WRITE for truncate, Eric Blake, 2020/04/28
- [PATCH 6/9] ssh: Support BDRV_REQ_ZERO_WRITE for truncate,
Eric Blake <=
- [PATCH 5/9] sheepdog: Support BDRV_REQ_ZERO_WRITE for truncate, Eric Blake, 2020/04/28
- [PATCH 7/9] parallels: Rework truncation logic, Eric Blake, 2020/04/28
- [PATCH 8/9] vhdx: Rework truncation logic, Eric Blake, 2020/04/28
- [PATCH 9/9] block: Drop unused .bdrv_has_zero_init_truncate, Eric Blake, 2020/04/28
- Re: [PATCH 0/9] More truncate improvements, no-reply, 2020/04/28
- Re: [PATCH 0/9] More truncate improvements, no-reply, 2020/04/28