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| author | Eric Blake <eblake@redhat.com> | 2020-04-28 15:29:02 -0500 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2020-05-08 13:26:35 +0200 |
| commit | be9c9404db7e6992946fa55c75ca61dfb20926eb (patch) | |
| tree | d1c974e4a6679cb120caf44aa086c36bb8abf53a /block/ssh.c | |
| parent | fec00559e71c94749deac176f6c4bebf81fbe7b8 (diff) | |
| download | qemu-be9c9404db7e6992946fa55c75ca61dfb20926eb.zip qemu-be9c9404db7e6992946fa55c75ca61dfb20926eb.tar.gz qemu-be9c9404db7e6992946fa55c75ca61dfb20926eb.tar.bz2 | |
ssh: Support BDRV_REQ_ZERO_WRITE for truncate
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 <eblake@redhat.com>
Message-Id: <20200428202905.770727-7-eblake@redhat.com>
Reviewed-by: Richard W.M. Jones <rjones@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'block/ssh.c')
| -rw-r--r-- | block/ssh.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/block/ssh.c b/block/ssh.c index 9eb33df..f9e08a4 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; |