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| author | Eric Blake <eblake@redhat.com> | 2020-04-28 15:28:58 -0500 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2020-05-08 13:26:35 +0200 |
| commit | 8e519795041e3293ab6b4e67f5416fa80dc0efc4 (patch) | |
| tree | d84c274024e3d6e856bd4d1a3e48d86027d61d65 /block/file-win32.c | |
| parent | 5e09bcee5ba2c69f79d59513436fc92db49ec302 (diff) | |
| download | qemu-8e519795041e3293ab6b4e67f5416fa80dc0efc4.zip qemu-8e519795041e3293ab6b4e67f5416fa80dc0efc4.tar.gz qemu-8e519795041e3293ab6b4e67f5416fa80dc0efc4.tar.bz2 | |
file-win32: Support BDRV_REQ_ZERO_WRITE for truncate
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 <eblake@redhat.com>
Message-Id: <20200428202905.770727-3-eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'block/file-win32.c')
| -rw-r--r-- | block/file-win32.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/block/file-win32.c b/block/file-win32.c index a6b0dda..fa56968 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); |